43results about How to "Meet the needs of engineering construction" patented technology

The invention relates to a method for treating a soft foundation. The method comprises the following steps of: 1, inserting electrical bars into treated soft soil; 2, reserving vertical drainage channels in the treated soft soil and communicating the vertical drainage channels with vacuum-pumping equipment; and 3, starting up the electrical bars to heat the treated soft soil and simultaneously starting up the vacuum-pumping equipment to vacuumize for quickening the drainage of bound water of the treated soft soil. The invention also relates to another method for treating the soft foundation. The method is implemented by arranging the electrical bars in sand drains. Due to the adoption of the method, the bound water in the soft soil can be gasified so that the bound water is quickly drained out of the soft soil, and the difficult problem that the water content of the soft soil is difficult to be lower than the critical point of 35 percent is solved. The method effectively reduces the bound water of the soft soil, realizes controllable improvement of mechanical properties of the soft soil, and meets the requirements of engineering construction by controlling heat energy and heating time. Due to the adoption of the technical scheme of the method, the time limit for a project can be shortened by over 50 percent, the construction cost can be saved by over 30 percent, the quality can be greatly improved, and the construction is environmentally protective.

The invention relates to a method for identifying and assessing needle-like ferrite pipe line steel tissues, which comprises the following steps: simplifying various ferrite tissues into ferrite and bainite; and by a heat dyeing experiment, enabling the different tissues and crystalline grains in the material to display the different contrast from white to yellow and brown, wherein the assessing of the needle-like ferrite pipe line steel banded tissue is divided into four levels. The measuring method for the ferrite crystalline grains of the needle-like ferrite pipe line steel comprises: a comparative method and a resection method are selected for the judging method of the ferrite crystalline grains; the comparative method is used for production inspection, if dispute exists, the resection method is the arbitration method; the comparative method is as follows: judging the grain size rank by comparing with a standard rating graph; and the resection method is as follows: assessing the grain size rank by counting the measureing segment of given length and number of the points of the grain boundary resection. The invention solves the problem that practical steel rolling tissue is difficult to analyze and identify, improves the contrast difference of phase and grain of components in the tissue, is convenient for tissue identifying and pipe line steel grain size assessing, makes up the defect of the national standard, and has reasonable and feasible quality control, check and evaluation on the line steel tissue.

A method for evaluating effectiveness of a measure for inhibiting alkali-silica active reaction of concrete aggregate comprises the following steps: using active aggregate used in actual works and low-alkali cement with available alkali Na2O content less than or equal to 0.60% or high-alkali cement with available alkali Na2O content of 0.90%+ / -0.1% to form mortar test pieces by mixing fly ash, and determining an inhibition measure effective where low-alkali cement mortar test pieces are formed and expansion rate of the mortar test pieces in 14 days is equal to or less than 0.040%, and determining the inhibition measure effective where high-alkali cement mortar test pieces mixed with the fly ash are formed and expansion rate of the mortar test pieces in 14 days is equal to or less than 0.050%. Thus, the method can help quickly determine the expansion rate of the mortar test pieces formed with the active aggregate used in actual works, and verify and evaluate the effectiveness of the measure for inhibiting the reaction of the concrete aggregate to meet engineering construction need.

The invention discloses hydraulic walking pushing system pump stations. A main control center comprises a jacking, pushing and rectifying displacement standard setting unit, a jacking, pushing and rectifying real-time displacement data input receiving unit, a jacking, pushing and rectifying control unit, a jacking, pushing and rectifying executing unit and a PLC automatic control unit, wherein the jacking, pushing and rectifying displacement standard setting unit is used for inputting the displacement standard set values of jacking, pushing and rectifying; and the jacking, pushing and rectifying real-time displacement data input receiving unit is used for receiving real-time displacement data of jacking, pushing and rectifying. The hydraulic walking pushing system pump station has the advantages that the multiple pushing units are subjected to three-dimensional control through one main control system so as to achieve continuous and synchronous working, the control precision is high, and the manpower cost is reduced; the expandability and the universality are high, the pushing units can be increased or decreased by increasing or decreasing the pump stations and jacks, and accordingly the requirements for construction of engineering of different spans and different tonnages are met; components do not need to be temporarily reinforced, equipment can operate till construction is completed after being installed in one time and does not need to be disassembled halfway due to the fact the length of a steel strand is not enough, and the bridge building cost can be reduced; and a dynamic rectifying function is achieved, and the defect that the equipment only can move forwards while cannot move backwards in a common traction mode is overcome.

The invention relates to the field of a novel space enclosing structure in a design and construction method of deep foundation, in particular to a prefabricated part composite cement soil wall and a construction method thereof. The prefabricated part composite cement soil wall comprises a plurality of cement soil piles which are internally provided with cement soil; the adjoining cement soil pilesare occluded with each other; and each cement soil pile is internally inserted with a strip-shaped prefabricated part. The construction method of the prefabricated part composite cement soil wall comprises the following steps of: locating and setting lines; excavating guide ways; setting drillers; locating the drillers and constructing the cement soil piles; setting locating frames for the piles;and inserting the prefabricated parts. The invention effectively reduces the construction cost on the basis of meeting the force requirement of the space enclosing structure of trenches and guaranteeing the security. The invention belongs to a novel space enclosing structure form with low cost, less environmental impact, safety and high efficiency, and can perfect the space enclosing structure form in the field of underground construction, so as to further meet the requirement of engineering construction.

The invention discloses a method for reinforcing soil by using a soil solidification solution. The method for reinforcing the soil by using the soil solidification solution includes the steps of putting calcium carbonate powder in a high pressure resistant container, adding water and then continuously introducing carbon dioxide gas thereto to form a saturated aqueous solution of calcium bicarbonate under the action of stirring, continuously spraying or pouring the obtained aqueous solution of the calcium bicarbonate on the surface or inside of the soil, allowing the calcium bicarbonate to decompose and form amorphous calcium carbonate with cementation function when water infiltrates into the soil for migration, and cementing soil particles into a whole to improve engineering properties such as strength, water stability and durability of the soil and meet the needs of engineering construction. The method for reinforcing the soil by using the soil solidification solution has the advantage of being suitable for various fields such as rock and soil reinforcement, dam and soil structures for anti-seepage and plugging, sand liquefaction prevention, heavy metal pollution soil treatment, earth and stone brick heritage building restoration, and concrete crack repair.

The invention discloses a flocculation combined vacuum prepressing system for treating blow-filled soil foundation, which comprises a treatment area, a vertical drainage plate, a transverse drainage plate and a vacuum pump, wherein the vertical drainage plate and the transverse drainage plate are respectively connected with the vacuum pump through a drainage pipe, the processing area covered withgeomembrane and geotextile. A stirring device is arranged on one side of the processing area, comprising a tank body, wherein the upper end is provided with an inlet, the lower end is provided with aconveying pipe, a conveying pump is arranged on the conveying pipe, the first motor is arranged at the upper end of one side of the tank body, the second motor is arranged at the lower end of the other side of the tank body, a first rotating shaft connected with a first motor and a second rotating shaft connected with a second motor are arranged in the tank body, an electric push rod is arranged at the lower part of the first rotating shaft, the second rotating shaft and the electric push rod are both provided with stirring rods. The system enables a mixture to be stirred more uniformly. The invention also discloses a method for treating the filling soil foundation by combining flocculation and vacuum prepressing.

The invention belongs to the technical field of concrete, particularly relates to a fresh mixed high-property concrete rheological property control method and device and aims at providing a novel stirring method and device suitable for high-property concrete. According to the device, a torque sensor and a speed adjuster are arranged on a stirrer, a power meter is arranged on a circuit of the stirrer, the power meter can transmit real-time motor power to a controller during stirring, the stirring speed of the stirrer can be controlled in three stages, the torque sensor is used for automaticallydetecting high-property concrete torque change in the stirring process, when the torque change is higher than the upper limit, and is maintained for a quite long time, the rotating speed is automatically lowered, a motor overload alarm is given out, when the torque change is lower than the lower limit, the rotating speed is automatically lowered, a producer is promoted to observe the concrete state, and quality problems of concrete disintegration, bleeding and the like can be solved.

The invention discloses a walking pushing system. A power device comprises a plurality of hydraulic pump station single bodies. Each hydraulic pump station single body is provided with a unit radial plunger pump capable of achieving multi-port and multi-pressure output, and each hydraulic pump station controls at least two pushing units. A main control center sends a command to each hydraulic pump station single body and controls each hydraulic pump station to work. Each pushing unit comprises a lifting device and a pushing device, wherein a lifting jack is fixed to the lifting device, and the upper portion of the lifting jack and a spherical plate are connected into a spherical concave-convex groove connection structure or an arc-shaped concave-convex groove connection structure. The walking pushing system has the advantages that continuous and synchronous working is achieved by achieving three-dimensional control over the multiple pushing units through one main control system, the control precision is high, the labor intensity is relieved, and the labor cost is reduced; the structure is compact and simple, disassembly and assembly are easy, the cost is low, and the working space is small; equipment does not need to be dismounted till the work is completed after being mounted once, and the defect that only advancing can be achieved and retreating cannot be achieved by a conventional pulling way is overcome; and a dynamic deviation correcting function is achieved, and deviation correction can be conducted in time in the advancing process.

The invention discloses soil stabilizer, which consists of industrial waste and chemical reagent, wherein the industrial waste consists of ground steel slag, coal gangue powder after being spontaneously-combusted, grain slag or furnace slag, the chemical reagent consists of calcium oxide, powder grinding aid and sodium sulfate, wherein the mass ratio of the industrial waste and the chemical reagent is 7: 3, and the fineness of the stabilizer powder is brinell specific surface area 500 to 900 m<2> / kg. The soil stabilizer has beneficial effects that mixture of the industrial waste is adopted as raw materials, so that the environmental pollution caused by the industrial waste can be solved; the original chemical activity of the mixture is used for rapidly condensing and solidifying the soil and sand, and no other surface active agent and alkaline excitant is needed, so that the cost is remarkably reduced, simultaneously the construction speed is fast, and the delivery period can be shortened; and the soil stabilizer is widely applied to the dam crest solidification and slope protection of foundation layers of road engineering and hydraulic engineering and is free from being restricted by any environment.

The invention discloses a prestressed concrete supporting pile wall, which comprises a cement-soil wall consisting of a plurality of cement-soil stirring piles. The cement-soil wall is provided with an outwards protruded or staggered structure, prefabricated piles are continuously or intermittently inserted in the cement-soil stirring piles, each prefabricated pile comprises multiple sections of reinforced concrete members, a plurality of through holes are arranged on each reinforced concrete member along an axis direction, the reinforced concrete members of each prefabricated pile are serially connected together via an anti-bending rope penetrating through the through holes of the prefabricated pile, after being tensioned, each anti-bending rope is respectively fixedly connected with two ends of the corresponding prefabricated pile, and a reinforcing anti-shear plate is fixedly mounted at a joint of each two adjacent reinforced concrete members. Due to the mode, the prestressed concrete supporting pile wall not only guarantees safety and reliability of a foundation pit supporting structure, but also has a good economic benefit, is convenient in construction and low in influence to environments, and further meets requirements of foundation pit engineering construction.

The invention discloses a method for reinforcing dredger fill by sealing and vacuumizing secondary overlaid clay. The method comprises the following steps that: a drain board is directly hit into a dredger fill foundation, wherein the upper end of the drain board is close to a mud surface of the dredger fill; the drain board is connected with a vacuumizing hose by a quick joint, and the drain board is hit again till the quick joint is hit below the mud surface by 60cm to 80cm; a vacuumizing system and a water collecting pipe system are arranged by taking the mud surface of the dredger fill above the quick joint as a primary sealing layer, and then the primary sealing layer is reinforced by being pre-pressed and vacuumized at a stable vacuum degree; and when the vacuum degree decreases, and the primary sealing layer is subjected to cracking and gas leakage, a mud layer as high as 60cm to 80cm is formed by filling a cofferdam in a reinforced area and then is taken as a secondary sealing layer, and the secondary sealing layer is filled and reinforced by being pre-pressed by vacuum till the secondary sealing layer is reinforced to reach a design standard. The method has the advantages of being simple in construction, being capable of being directly used for reinforcing dredger fill which is formed by reclamation projects and almost has no bearing capacity, and being capable of saving construction funds.

The invention relates to a column-pile combined cover nut and a use method thereof. The column-pile combined cover nut is formed by splicing at least two cover nut valve bodies, wherein each valve body is composed of an arc-shaped sleeve body, a fan-shaped sleeve cover connected with the upper side of the arc-shaped sleeve body, and an upper raised head connected with the center of the fan-shaped sleeve cover, a pin hole is formed on the arc-shaped sleeve body and is matched with a locating pin at a metal cap of the top of a prestress pipe pile. The column-pile combined cover nut further comprises at least one arc-shaped hoop sleeved outside the arc-shaped sleeve bodies of the cover nut valve body, so as to hoop the cover nut valve bodies together; and anti-slip barrier strips are also arranged outside the arc-shaped sleeve bodies to limit the arc-shaped hoops. The column-pile combined cover nut also comprises a head frame which is used for binding the upper raised heads of the cover nut valve bodies together and is locked on the fan-shaped sleeve covers through fastening bolts; and each fan-shaped sleeve cover is provided with a locking device connected with a steel column. The column-pile combined cover nut can make the best of the prestress pipe pile, so as to achieve the purpose of one pile with two functions, and realizes the purposes of shortening construction period, reducing construction cost and improving social benefit.

The related degaussing method for spiral weld pipe mainly applies magnetic field with reverse direction to magnetic field generating welding current to take coarse degaussing and fine degaussing. Besides, the relative equipment comprises a degaussing transformer, a contact voltage regulator, a bridge rectifier, and a coil. The residual magnetic field is less 10Gs. This invention has well both economic and social benefits.

A double-full sleeve disposable rotary cutting pile clearing device and its pile clearing method. The pile clearing device includes a chassis, a main mast and a hoist installed on the chassis. A power head is arranged on the main mast in a sliding manner, and the power The power head is connected to the winch through the traction rope wrapped around the pulley on the main mast; the power head is respectively connected with an outer full casing in a detachable manner downwards, and an inner full casing is connected in a fixed manner, and the outer full casing It is arranged coaxially with the inner full sleeve; the inner full sleeve is ring-shapedly provided with multiple sets of telescopic and amplitude-changing cutting assemblies at the bottom end of the side away from the power head. Through a reasonable structure, the present invention realizes the one-time rotary cutting pile cleaning treatment of the target pile, and compared with the prior art, it reduces the overall use of devices and equipment of the pile cleaning device, and reduces the use cost. At the same time, the cleaning The pile device not only works fast, but also has high efficiency, which greatly meets the needs of engineering construction.

The invention discloses a high-performance concrete strength predicting method based on a memristor-gradient reducing method neural network. The method comprises the steps of acquiring high-performance concrete experiment data, establishing a database, and obtaining a training sample and a predicting sample; according to the memristor and a traditional gradient reducing learning algorithm, establishing a memristor-gradient reducing method neural network; training the established memristor-gradient reducing method neural network by means of the obtained training sample, and obtaining a trainedmemristor-gradient reducing method neural network; inputting a predicting sample into the trained memristor-gradient reducing method neural network, and predicting the high-performance concrete strength; outputting the strength value of to-be-predicted high-performance concrete, and performing performance evaluation on a predicting result. The method of the invention can accurately predict the strength of the high-performance concrete, thereby satisfying a building engineering requirement. The method can be applied for predicting the high-performance concrete strength in actual engineering.

The invention relates to the technical field of concrete materials, in particular to a method for making concrete by using calcareous sand. The concrete is prepared from the following components in parts by weight: 665 parts of calcareous sand, 2-6 parts of fiber, 385 parts of concrete, 1084 parts of stone and 215 parts of water. The method has the beneficial effects that local materials can be used, economic benefits of engineering construction is improved, meanwhile, due to the fact that the strength of the calcareous sand is low, the strength of the concrete mixed by using the calcareous sand as fine aggregates is low, by adding basalt fiber into the concrete, the strength of the concrete can be significantly improved, and the needs of engineering construction are met.

The present invention discloses a pipeline material cloud elastic cutting, labeling and processing automatic guidance system and method, belonging to the technical field of project material preparation and especially the pipeline project material preparation optimization system and method. Based on the operation requirements of flexible, customized, recognized and guided project application material use, the cloud operation processing novel mode of project material preparation is established, especially for the elastic pipeline, elastic cutting label and processing operation requirements, a new automatic guide system is established, the material preparation processing operation is facilitated, and the pipeline material preparation requirement is satisfied. According to the system, a material preparation information guide can be provided for material preparation staff to be clear about operation information, a control process is checked through a system operation, the material preparation task certainty is ensured, the production is in accordance with the automatic guide application function material use of a work application requirement, the project application requirement is satisfied, the projection material use management and application material control blind point is solved, and the application efficiency is improved.

The invention discloses a cast-in-place externally prestressed concrete-filled steel pipe pile, which comprises a steel pipe, a concrete layer cast-in-place in the steel pipe and multiple prestressed tendons arranged on the steel pipe, wherein the prestressed tendons are arranged along the direction of the axis of the steel pipe, and comprise top sections, middle sections and bottom sections; the middle sections are positioned outside the steel pipe; the top sections and the bottom sections penetrate through the wall of the steel pipe and enter into the steel pipe; the upper end of the steel pipe is opened, and the bottom end of the steel pipe is provided with a sealed structure. The invention also provides a construction method of the concrete-filled steel pipe pile and a support pile wall with the concrete-filled steel pipe pile. In the way, the external prestressing technology is adopted by the cast-in-place externally prestressed concrete-filled steel pipe pile, a pile body can be restrained better, the tensile resistance is provided, and deformation of the support pile wall in the excavation process of a foundation pit is effectively limited; in addition, field fabrication can be performed, transport costs are reduced, on the premise of guaranteeing safety and reliability of a foundation pit support, the cost is reduced, the construction period is shortened, and construction is convenient.

The invention discloses a hydraulic system for a power transmission device of a horizontal directional drilling rig capable of realizing three push-pull speeds, comprising: a gear pump connected through pipelines, a first electromagnetic reversing switch, a second electromagnetic reversing switch, Load sensing pump, third electromagnetic reversing switch, fourth electromagnetic reversing switch and four orbital motors. The advantages are: the above-mentioned hydraulic system can realize three push-pull speeds when used in the power transmission device of the horizontal directional drilling rig, and the hydraulic motor is directly driven through the rack and pinion, with a large speed range, a simple structure, and a small number of parts, which simplifies the transmission chain and reduces Reduce the cost and reduce the failure rate to meet the needs of engineering construction.

The invention belongs to the technical field of municipal engineering, and particularly relates to a mold for manufacturing patterns on the surface of a prefabricated part and an assembling method of the mold. The mold comprises a steel mold plate and a pattern bottom mold body bonded to the inner surface of the steel mold plate, the pattern bottom mold body is made of a solid wood board or a solid wood particle compressed board or a density fiberboard, and engraved lines matched with patterns on the surface of the prefabricated part are formed on the inner side of the pattern bottom mold body. According to the mold for manufacturing the patterns on the surface of the prefabricated part and the assembling method of the mold, the pattern bottom mold is bonded to the inner surface of the steel formwork so that various patterns can be formed on the surface of the prefabricated part to be coordinated with the using environment, and the mold has the advantages of being easy to operate and convenient to install and not influencing the overall strength and rigidity of the existing steel formwork.

The invention discloses silicon amino drilling fluid and a preparation method thereof and belongs to the technical field of resource exploration and oil exploitation. The drilling fluid is prepared from, by mass, 3-5% of sodium bentonite, 02-0.3% of tackifier, 0.3-0.5% of a coating agent, 0.5-2% of a fluid loss additive, 3-5% of a blocking agent, 0.5-1% of amidocyanogen silanol inhibitor and 0.1-0.5% of NaOH. The structural general formula of the amidocyanogen silanol inhibitor is shown in the description, wherein in the formula 8, R1 is hydrogen, hydroxyl groups, hydroxybenzoate groups, alkyl groups with 1-5 carbon or alkoxy groups with 1-5 carbon, m is any integer from 0 to 2, R2 is shown in the description, and n is any integer from 0 to 3. The drilling fluid has high inhibition performance on shale, can effectively inhibit mud making of clay, has the excellent rheological property, is little in filter loss, effectively protects reservoir easily and can meet requirements of drilling operation.

The invention relates to a method for treating a soft foundation. The method comprises the following steps of: 1, inserting electrical bars into treated soft soil; 2, reserving vertical drainage channels in the treated soft soil and communicating the vertical drainage channels with vacuum-pumping equipment; and 3, starting up the electrical bars to heat the treated soft soil and simultaneously starting up the vacuum-pumping equipment to vacuumize for quickening the drainage of bound water of the treated soft soil. The invention also relates to another method for treating the soft foundation. The method is implemented by arranging the electrical bars in sand drains. Due to the adoption of the method, the bound water in the soft soil can be gasified so that the bound water is quickly drained out of the soft soil, and the difficult problem that the water content of the soft soil is difficult to be lower than the critical point of 35 percent is solved. The method effectively reduces the bound water of the soft soil, realizes controllable improvement of mechanical properties of the soft soil, and meets the requirements of engineering construction by controlling heat energy and heating time. Due to the adoption of the technical scheme of the method, the time limit for a project can be shortened by over 50 percent, the construction cost can be saved by over 30 percent, the quality can be greatly improved, and the construction is environmentally protective.

The invention belongs to the technical field of buildings, and discloses a construction load detection method and system for an aluminum alloy formwork assembly system, and the method comprises the steps: determining a construction load parameter value of the aluminum alloy formwork assembly system; calculating a concrete side pressure load; calculating a floor plate load value; calculating and checking an aluminum alloy template; performing floor and beam aluminum alloy formwork calculation and checking through floor and beam aluminum alloy formwork overall strength and rigidity checking, local rib plate and panel strength and rigidity checking, floor main keel strength and rigidity checking and floor main keel pull rod strength checking; calculating an aluminum alloy template support system and a material distributor equivalent support; and judging whether the standard is met, and if so, passing the detection. The construction load of the aluminum alloy formwork assembly system can be effectively detected, it is ensured that the strength and rigidity of related formworks meet the standard requirements, the safety of formwork engineering is improved, operation errors are avoided,and the popularization of the formwork system is better facilitated.

The invention discloses an insulation structure for a cup rim column foundation. In the insulation structure, the cup rim bottom is an epoxy mortar leveling layer (3); the circumferential ring of the cup rim is an epoxy rein mortar scraping layer (2); the upper layer of the epoxy mortar leveling layer (3) is a rubber layer (4); a column head (1) is connected with the rubber layer (4); the bottom part of a gap between the column head (1) and the periphery of the cup rim is filled with macromolecular pure resin (5); and the upper part is filled with macromolecular mortar (6). In the insulation structure, a conventional diabase cast stone material is discarded; and the disadvantages in conventional construction are overcome by utilizing the high insulating property between rubber and a macromolecular resin material.

The invention discloses a full-prefabricated assembled structure bridge suitable for grassland wetlands and a construction method thereof; the full-prefabricated assembled structure bridge includes anumber of precast capping beams, wherein a plurality of linearly distributed notches are formed in the precast capping beams, two inserting holes are formed in each notch, the axes of the two inserting holes are respectively inclined towards two opposite outer sides of the precast capping beam from top to bottom, a matched prefabricated pipe pile is inserted into each inserting hole, and the top ends of the prefabricated pipe piles and the corresponding inserting holes are fixed through cast-in-place concrete; an upper structure is laid on every two adjacent precast capping beams and is a small prefabricated box beam or a prefabricated superposed beam. The assembled structure bridge and the construction method are used for solving the problems that in the prior art, an annual effective construction period of an grassland wetland area is short, the seismic intensity is high, the ecology is fragile and the like, and construction of a traffic network is restricted; the purposes of avoiding pollution of a traditional pile hole filling pile foundation to an underground water system and reducing the influence on the grassland wetland ecological environment with a high environmental sensitivity are achieved.

The invention belongs to the technical field of building engineering construction, and discloses a foundation pit supporting structure and a construction method, and the foundation pit supporting structure comprises an underground diaphragm wall and an MJS construction method cutoff wall. The underground diaphragm wall extends in the circumferential direction of the foundation pit. The MJS construction method cutoff wall extends in the extending direction of the underground diaphragm wall, the top end of the MJS construction method cutoff wall is in waterproof sealing connection with the bottom end of the underground diaphragm wall, and the MJS construction method cutoff wall is used for cutting off a confined water layer. When the length of a reinforcement cage or the height of a crane cannot meet the requirement due to the limitation of a construction site, and the depth of the underground diaphragm wall cannot meet the requirement for separating the confined water layer, the MJS construction method cutoff wall is spliced below the underground diaphragm wall and extends in the extending direction of the underground diaphragm wall, and the MJS construction method cutoff wall is spliced below the underground diaphragm wall. The top end of the MJS construction method cutoff wall is in waterproof sealing connection with the bottom end of the underground diaphragm wall, so that the MJS construction method cutoff wall is matched with the underground diaphragm wall to cut off the confined aquifer, and the engineering construction requirement is met.

The invention discloses a high-performance concrete strength prediction method based on memristor-gradient descent method neural network, including obtaining high-performance concrete experimental data, establishing a database, and obtaining training samples and prediction samples; combining memristor and traditional gradient A descent learning algorithm is used to establish a memristor-gradient descent method neural network; the obtained training samples are used to train the established memristor-gradient descent method neural network to obtain a trained memristor-gradient descent method neural network; The prediction samples are input into the trained memristor-gradient descent method neural network to predict the strength of high-performance concrete; output the strength value of high-performance concrete to be predicted, and perform performance evaluation on the prediction results. The method of the invention can accurately predict the strength of the high-performance concrete, meets the requirements of construction projects, and can be applied to the prediction of the strength of the high-performance concrete in actual projects.

A method for evaluating effectiveness of a measure for inhibiting alkali-silica active reaction of concrete aggregate comprises the following steps: using active aggregate used in actual works and low-alkali cement with available alkali Na2O content less than or equal to 0.60% or high-alkali cement with available alkali Na2O content of 0.90%+ / -0.1% to form mortar test pieces by mixing fly ash, and determining an inhibition measure effective where low-alkali cement mortar test pieces are formed and expansion rate of the mortar test pieces in 14 days is equal to or less than 0.040%, and determining the inhibition measure effective where high-alkali cement mortar test pieces mixed with the fly ash are formed and expansion rate of the mortar test pieces in 14 days is equal to or less than 0.050%. Thus, the method can help quickly determine the expansion rate of the mortar test pieces formed with the active aggregate used in actual works, and verify and evaluate the effectiveness of the measure for inhibiting the reaction of the concrete aggregate to meet engineering construction need.

The invention discloses an assembly gravity type retaining wall structure and a construction method thereof. The technical problems that a traditional gravity type retaining wall is large in structuresize, long in cast-in-place and maintenance time, and construction quality cannot guarantee are solved, and the requirement for construction of railway subgrade engineering in a plateau mountainous area is met. The structure involves a foundation and a gravity type retaining wall body located on the foundation, the gravity type retaining wall body is composed of an assembly type wall body and a backfill material filling an inner cavity of the assembly type wall body, the assembly type wall body is formed by vertically assembling a multiple layers of splicing unit, each layer of splicing unitcomprises framework plates which are arranged at intervals in the line direction and soil retaining plates which are front-back arranged at intervals in the vertical line direction, the framework plates and the soil retaining plates are connected to form a continuous box body through clamping grooves, the every two adjacent layers of splicing units are connected through the clamping grooves in theframework plates and the soil retaining plates, and the bottom of the lowermost splicing unit is fixedly connected with the foundation.