401 results about "Railway engineering" patented technology

The invention relates to a method for constructing a real scene model collaborative design platform of railway engineering. Railway and urban rail transit projects are distributed in a strip shape, engineering data are large, numerous professions are involved, and therefore, the efficient and stable collaborative design platform needs establishing. According to the method, the strip-shaped continuous three-dimensional real scene model is established along the whole range of the project, and fusion processing is performed on all professional three-dimensional building information models (BIM) and the three-dimensional real scene model. Under the management mode of a distributed database, management is performed on a global data base of the three-dimensional real scene model collaborative design platform and special databases of all professional BIM design platforms which only transmit upstream data and downstream data involved in collaborative design and generated BIM three-dimensional design results onto the three-dimensional real scene model collaborative design platform. By means of the method, the strip-shaped project information model along the whole range of the project is established, all professional interactive data are integrated into a continuous three-dimensional real scene, and collaborative design is achieved.

The invention belongs to the technical field of tunnel detection of railway engineering systems and particularly relates to a method and a rail vehicle for full-section comprehensive detection of railway tunnels. The rail vehicle comprises a rail vehicle floor board, a cab and a carriage. Line-scan cameras are arranged on an arch frame which is arranged on the rail vehicle floor board, air-coupled shield antennas, and a GPS (global positioning system) mainframe, ground penetrating radar and infrared thermal imagers are arranged on the rail vehicle floor board. A GPS receiver is arranged at the top end of the cab, a laser scanner is arranged at the tail of the top plate of the carriage, and an industrial personal computer is arranged in the carriage. By multiple detection systems, one-time full-section detection of tunnel lining states and tunnel bottom damages can be realized, high detection accuracy, high efficiency, shortening of maintenance time and saving of maintenance cost are realized, influences on normal transportation of the railway tunnels are low, and loss caused by stopping of transportation is reduced.

The present invention relates to an urban underground engineering simulation test system, underground water simulation system and data acquisition system, in which the simulation box contains horizontal loading plate, horizontal loading device, vertical loading device and several layers of horizontal water inlet pipes. Said invention can implement three-dimensional simulation test of various urban underground railway engineering, tunnel and anderground cave engineering, ground base an foundation work, special underground construction method, side slope engineering and retaining wall engineering, etc.

The invention discloses an existing railway line retesting method based on the on-board laser radar technology. Firstly, control marks are arranged along a railway to be tested at preset intervals; secondly, position coordinates of the center point of each control mark on a railway engineering coordinate system are measured; thirdly, laser point cloud data and image data of rails, railway equipment and facilitates (such as annunciators, turnouts and contact net rods), terrain around the railway and the control marks along the railway are obtained, and colors of the image data are assigned to corresponding laser point cloud data; fourthly, the obtained colorized laser point cloud data are subjected to precision refining treatment with the position coordinates of the control marks as reference points, so that errors in the colorized laser point cloud data are eliminated; fifthly, rail surface linear laser point data are extracted from the colorized laser point cloud data subjected to the precision refining treatment; and sixthly, the line type of the existing railway is restored through the rail surface linear laser point data. Information of the existing line is accurately obtained under the condition that operation of the railway is not influenced.

The invention discloses a method for increasing railway onboard laser radar scanning data precision. The method comprises steps of: 1, laying control signs at preset intervals along a railway to be tested; 2, enabling an onboard laser radar system to scan along the railway to obtain railway onboard laser radar point cloud data; 3, based on a railway base control network, measuring the three dimensional coordinates of the central point of the control sign in a railway engineering coordinate system by using a total station free station setting method; 4, extracting the coordinates of the central point of the control sign from the railway onboard laser radar point cloud data, and correcting the railway onboard laser radar point cloud data according to a difference value between the coordinates of the central point of the control sign extracted from the railway onboard laser radar point cloud data and the three dimensional coordinates of the central point of the control sign in the railway engineering coordinate system measured by the total station. The method is simple and feasible in operation and enables the railway onboard laser radar data precision to satisfy existing line repetition measurement precision requirement.

The invention discloses a dynamic and static triaxial tester for frozen and thawed soil in an open system. The tester comprises a temperature control system, a water-replenishing system, a loading system, a confining pressure system, and a data acquisition system, wherein the temperature control system comprises a cold end socket, a warn end socket, a high and low-temperature constant-temperature liquid bath circulator, a porous pressure-transmitting medium, and a rubber film; the water-replenishing system comprises a water-replenishing tank, a water-replenishing bottle, and a high-intake value ceramic plate; the loading system comprises an exciter, a reaction frame, a test pedestal, a central force transmission rod, and a counterweight; the confining pressure system comprises a linear bearing, a pneumatic valve, an external pressure chamber, and an internal pressure chamber; and the data acquisition system comprises a displacement sensor, an annular liquid level calibration chamber, a dilatation measurement chamber, a differential pressure sensor, a piezoelectric force sensor, a temperature sensor, and a humidity sensor. The dynamic and static triaxial tester for the frozen and thawed soil in the open system disclosed by the invention can carry out a conventional frozen soil test involved in Code for Soil Test of Railway Engineering (TB10102-2010), an unidirectional freezing or thawing test for a specimen under the action of a dynamic load and different stress states, etc.

The invention discloses a prestressed anchor cable pile sliding wall along a river road shoulder and a construction method thereof, which relate to a high-filling retaining structure in construction fields of mountain roads and railway engineering, and comprise a circular pile, a coupling beam, T-shaped columns, retaining plates, anchor cables and anchor piers, wherein the circular pile, the coupling beam and the T-shaped columns are sequentially connected from the bottom up, the retaining plate is put at the inner side of each T-shaped column, an upper anchor pier, a middle anchor pier and a lower anchor pier are respectively arranged on the T-shaped column from top to bottom, the three fixed sections of an upper anchor cable, a middle anchor cable and a lower anchor cable are respectively anchored into a rock-soil layer, after the anchor cables pass through prepared holes of the T-shaped columns, the anchor cables are stretched and locked on the corresponding anchor piers, the inclination angles of the upper anchor cable, and the middle anchor cable and the lower anchor cable are designed to be 15 degrees, 18 degrees and 21 degrees. The invention has rational structure, easy implementation and good quality and is applicable to the construction of prestressed anchor cable pile sliding wall along the river road shoulder.

The invention discloses a design method of seamless turnouts on an elevated station of a longitudinally, transversely and vertically coupled high-speed railway, belonging to the fields of railway engineering technology application and design. The design method comprises the following steps: by considering the factors of the structure of a bridge, the arrangement mode of supporting seats and the structure types of rails and considering the actual conditions of displacement coupling among towing points and the influence of the longitudinal displacement of steel rails on the transverse deformation of tongue rails, making a basic assumption; using three-dimensional beam elements to simulate the steel rails; establishing non-uniform beam elements according to the actual cross sections for tongue rails and point rails; modeling according to the actual cross section attributes for steel rails; and using a finite element method to complete corresponding computational analysis according to different working conditions of the seamless turnouts on the bridge. The invention really reflects the mutual coupling action of the bridge, the rails and the turnouts, obtains more accurate results, meets the actual conditions, has high efficiency and strong flexibility, is suitable for design and computational check of various seamless turnouts or turnout groups on the bridge, and provides a reliable tool for the design of the seamless turnouts on the bridge.

The invention provides a railway project management platform system. The system comprises an infrastructure layer, a data resource layer, a business application layer and an access layer, wherein the infrastructure layer is used for collecting, transmitting and storing railway project parameters; the data resource layer is used for processing the railway project parameters according to preset processing types and performing storage; the business application layer is used for managing railway project comprehensive information, controlling a railway project construction process and managing railway project field devices according to the railway project parameters; and the access layer is used for providing an identity authentication entry of the system. According to the railway project management platform system, through an integrated, standardized, intelligentized and service-oriented unified open management platform suitable for modern railway informatization construction, standardized construction is facilitated, a construction process is effectively supervised, the quality safety risk is prevented, the management level of a construction project is improved, and the ordered efficient promotion of the construction project is realized.

The invention relates to a nondestructive detection device for tunnel linings. The nondestructive detection device comprises universal casters with brakes, a worktable, a distance fine adjustment assembly, a height adjustment assembly, an automatic knocking assembly and a peripheral upper computer. The universal casters are mounted under a base of the worktable. The nondestructive detection device can be fixed onto a railway engineering vehicle by the aid of steel pipes and scaffold right-angle fasteners when about to work, the railway engineering vehicle and the carried nondestructive detection device can be dragged by a locomotive to move along tunnels, the tunnel linings can be knocked by the automatic knocking assembly of the nondestructive detection device, knocking sound waves can be converted into electric signals by a microphone, knocking sound signals can be acquired and analyzed by the upper computer, tunnel health information of structural parameters, cavities and the like of the tunnel linings can be obtained, and accordingly the tunnel linings can be nondestructively detected. The nondestructive detection device has the advantages that the nondestructive detection device is in a modular design and is convenient to assemble and disassemble, and requirements on 'skylight time' and requirements of detection on different tunnel linings can be met; the nondestructive detection device is easy to operate and high in automation degree, detection efficiency and precision and cost performance, conditions of the tunnel linings can be quickly judged after the tunnel linings are detected, and the like.

The invention provides an en expansive soil road cutting side slope reinforced soil back-pressure seepage-preventive supporting structure and a construction method thereof. The supporting structure comprises an expansive soil road cutting side slope, a slope toe retaining structure is arranged at the toe of the slope, a geomembrane seepage-preventive structure, a reinforced soil slope surface protection structure and an anchor rod system are arranged on the surface of the slope, and a slope top back-pressure seepage-preventive structure is arranged at the top of the slope. The supporting structure is simple in form, the protection structure is high in flexibility and short in construction period, the problems of stability and construction period of an expansive soil high slope can be solved effectively, and the supporting structure is an innovation for high and steep expansive soil road cutting side slope excavation scheme and supporting technology in the field of railway engineering.

The invention belongs to the field of railway engineering and provides a high-speed railway plate-type ballastless track structure evaluation method based on CA mortar damage. On the basis of the theories of the comprehensive track structural mechanics, the wheeltrack system dynamics and the finite element, CA mortar damage behavior is simulated accurately through reasonable mechanical simplification by means of large finite element software such as ANSYS and ANSYS / LSDYNA, and different levels of standards of corresponding CA mortar damage maintenance and repair are generated according to the simulation result. With the method, deformation and stress of all components such as a plate-type ballastless track system steel rail, a track plate, a mortar filling layer and the like and parameters such as vibration accelerations of all the components of a vehicle and the track system can be obtained, and thus influences of the CA mortar damage to the stress on the track structure and driving safety and comfort can be effectively evaluated, and the method has important practical significance in maintenance and repair management of plate-type ballastless tracks.

The invention discloses an engineering calculation method and system based on a BIM technology, and belongs to the technical field of infrastructures represented by railway engineering. The method comprises the steps of establishing a standard parameter library, and storing geometrical parameter information of a component in the standard parameter library; importing an REVIT model, and analyzing the REVIT model based on the standard parameter library to obtain geometric parameter information of the REVIT model; determining a calculation rule, and calculating and generating an enterprise list engineering quantity; correlating the enterprise list engineering quantity with engineering quantity list decomposition projects in a cost management system; and calculating the quantity of the generated engineering quantity list decomposition items. The system comprises a standard library module, an import analysis module, a first association module, a calculation module, a second association module and a calculation module. According to the method, the calculation efficiency can be improved, the engineering quantity information of the model is quickly obtained based on the BIM model information, and the engineering quantity and the report form required by the enterprise cost management system are generated.

A method for measuring geometric parameters of a track by adopting a camera comprises the following steps: a measuring vehicle is placed on the track to be measured; a camera device is fixedly installed on one end inside the measuring vehicle; an optical axis of the camera device is in parallel with the plane of the bottom of the measuring vehicle; two sign posts are arranged on the track at the other end inside the measuring vehicle and are respectively perpendicular to the two sides of the plane of the bottom of the measuring vehicle; the two sign posts are at different heights and at the distance of r; a cooperation sign is arranged at the top end of each sign post; the sign posts can only move in the direction perpendicular to the plane of the bottom of the vehicle and in the transversal direction; a wheel at the bottom of the sing post moves, and is tightly attached to the inner side of a steel track; when the measuring vehicle moves on the track to be measured, the camera device is utilized to capture images of the cooperation signs at different time; and the images is processed through image processing and data processing on a real-time basis so as to acquire the geometric parameters of the track. The method meets the requirements of modern track construction and development, satisfies the requirements of high precision, high reliability and high automatic degree detection, and has good application prospect in the railroad engineering field.

The invention provides a method for setting up a three-dimensional virtual scene of a railway engineering project. The method includes: S1, collecting relevant data of the railway engineering project and determining model attribute information of the railway engineering project according to the data; S2, according to the determined attribute information, generating a three-dimensional model base of the railway engineering project and a peripheral three-dimensional environment of the three-dimensional model base, and conducting model matching, model posture adjustment and model stretching; and S3, by unifying a coordinate system in a three-dimensional geographic information system (GIS) platform, the three-dimensional model base of the railway engineering project and the peripheral three-dimensional environment are combined so as to display a set scene. The method has the advantages of checking effects of a peripheral environment of a high speed railway on the railway directly; displaying information of bridges, roadbeds, tunnels and culverts visually and meticulously; achieving engineering project unified information retrieval; reducing labor cost in a modeling process, and improving setting up efficiency of the three-dimensional environment; and guaranteeing display accuracy of railway engineering project information.

The invention discloses a method for repairing and reinforcing an open joint of a filling layer of a slab ballastless track and belongs to the technical field of high speed railway engineering maintenance. The method comprises the following steps of drilling and anchoring a slab of the track with the open joint; grouting and repairing an open joint area of the filling layer. The method solves the problem that an effective method for repairing the open joint of the filling layer is lacked in the prior art; the method is simple and quick in procedures and easy to implement, can effectively eliminate the open joint of the filling layer of the slab ballastless track structure, ensures that the requirement on high speed running is met after repair, can be used for repairing and reinforcing the open joint of the filling layer of the slab ballastless track of a high speed railway, and can also be used for repairing and reinforcing other projects with layered structures.

The invention relates the constant tension compensation equipment, and belongs to the electrolyzed railway power supply technology field. The equipment comprises the spring on the substrate, and the said spring is the constant turning rule or linear changeable turning rule plane turbination spring with one end fixed opposite to the substrate and the other to the main shaft; the said main shaft is supported on the substrate and the shaft is rigidly set with the crown chute, the screw chute, the linear chute that are enwound by the steel wire lines. When the stress cable and the contacting wire lead the length change as the environmental temperature changing, the matching group of the springs and the chutes can be compensatively adjusted through the tension of the springs and maintain the constant tension on the stress cable and the contacting wires so as to meet the demand of the electrolyzed railway engineering. The invention has the strong points of tight structure, small volume, light weight and convenient equipment.

The invention relates to the technical field of large railway engineering machinery, in particular to a sand removal engineering truck. A bogie is arranged at two ends of the lower portion, a sand sucking device is arranged in the middle of the lower portion, and a driver's cab I, a power room, a work room, an auxiliary room, a living room and a driver's cab II are sequentially arranged at the upper portion. A sand throwing machine is arranged in the work room, cleaning devices are arranged in front of wheels on the outer side of the bogie, and the sand sucking device, the sand throwing machine, a sand blowing device, a movable air duct, a hydraulic station and the cleaning devices form a sand removal system. Sand is thrown to regions located outside railways and appointed by users through two working processes of sand suction and sand blowing of the sand throwing machine. In addition, the sand removal engineering truck is provided with a self-walking system and an integrated control system, integrates self-walking and sand removal functions, can perform continuous and automatic removal operation on large-area accumulated and buried sand of railway lines, is a large sand removal engineering truck for a railway, can be used for daily sand removal and maintenance operations of the railway lines in windy and sandy regions and is especially suitable for quick sand removal and cleaning operation of large-area railways after sand storms.

The invention relates to the technical field of railway engineering detection, and provides a railway roadbed geological radar defect map analysis method and device in allusion to problems existing inthe prior art. The railway roadbed geological radar defect map analysis method comprises the steps of forming forward modeling on geological radar electromagnetic waves, preliminarily establishing aroadbed defect map, analyzing feature laws of the simulated defect map in various types of geological radar images, and forming a railway roadbed simulated geological radar typical defect map featurelibrary; setting a typical roadbed defect test area, and performing field testing by using geological radar nondestructive testing equipment, and respectively generating profile grayscale maps or waveform maps of a compaction area and the roadbed typical defect test area correspondingly; and performing comparative analysis on the generated profile grayscale maps or waveform maps of the compactionarea and the roadbed defect test area according to the simulated geological radar typical defect map feature library, and summarizing a railway roadbed actual measurement geological radar typical defect map feature library; and performing rapid non-destructive detection and defect judgment on the actual railway roadbed according to the geological radar typical defect map feature library.

The invention belongs to the field of box girder erection transporting girder vehicles in high-speed railway engineering construction technology, and particularly relates to an automatic control method and a control system for driving of a transporting girder vehicle through a tunnel. The control system comprises a controller used for calculating, analyzing, processing and controlling received data, and a distance measuring system, an angle measuring system, a safety protection and alarm device, a human-machine interface, a steering control proportional valve and a driving control proportional valve which are connected with the controller. According to the method and the system, the central line offset of the transporting girder vehicle can be controlled automatically in a small range, so that collision between a box girder and the inner wall of the tunnel caused by large offset is avoided, the transporting girder vehicle can pass through a width-limited long curve tunnel safely and rapidly, and auxiliary components and facilities do not need to be added in the tunnel.

The invention provides a logistical support vehicle used for railway engineering construction. The logistical support vehicle comprises a powered-up kitchen vehicle body, a catering office vehicle body and a camping vehicle body which are mutually connected. The powered-up kitchen vehicle body comprises a vehicle body I, the catering office vehicle body comprises a vehicle body II, and the camping vehicle body comprises a vehicle body III. A machine room, a monitoring room and a kitchen room are arranged in the vehicle body I in sequence. A conference room and an office room are arranged in the vehicle body II in sequence. A living room, a bath room and sleeper rooms are arranged in the vehicle body III in sequence. An overhead line system power obtaining device is arranged at the top of the machine room; an overhead line system power supply device is arranged in the machine room; and power generating sets are arranged in the middle of the lower portion of the vehicle body I. The vehicle body I, the vehicle body II and the vehicle body III are each provided with an external input socket and an output socket at the front end and the rear end correspondingly. According to the logistical support vehicle used for railway engineering construction, the overhead line system power supply device, the power generating sets and the external input sockets are used for providing power sources for the logistical support vehicle and other coupled vehicles, electrification of the vehicles is achieved, and the logistical support vehicle is safe, environmentally friendly, economical and practical; and meanwhile the logistical support vehicle is provided with complete logistical support facilities, and the requirements of accommodation and cultural activities of constructors are met.

The invention discloses a concrete member crack auto-detection apparatus, method and system. The apparatus, method and system acquire a crack image generated when a bridge member is under loading through an image acquirer and transmit the image to an image processing system for processing, and image information of a crack generated in the member is acquired. The apparatus, method and system acquires the crack information of a member by means of automatic image acquisition, whether cracks at different parts and having different widths and lengths belong to qualification criteria for stressed cracking can be judged objectively according to the image information, the image information allows data to be uploaded to a railway engineering construction information management platform data center, it is convenient to acquire loading test data of a bridge member, and loading test data of the bridge member is truer, more correct and more reliable.

The invention discloses a laser measuring apparatus for track lifting and turning of railway engineering affairs, and the laser measuring apparatus comprises a laser emitter device, a measuring device and two travel dollies, wherein, the laser emitter device and the measuring device are respectively arranged on one travel dolly. A wireless communication device is arranged on the laser emitter device and the measuring device, wherein, the laser emitter device comprises a track lifting LASER, a turning track LASER, a laser data processor and a display, and the measuring device comprises an optic lens, a CCD sensor, a measured data processor, a display and a horizontal sensor. The invention utilizes the laser as a datum line, and the CCD sensor is used as a collimation detector, thus, the measuring problem of track lifting and turning quantity of steel rails with long length of over 200 metres of the railway engineering affairs is solved, and the smoothness of railway lines can be detected in the high precision way. The invention provides reliable measuring bases for railway maintenance and has the advantages of high measuring precision, operation efficiency improvement and reduction of the labor intensity of workers.

This invention relates to a new highway and railway projects soft ground process method. The method squeezes soft mud opening in the face of weak foundation through the following steps :a,equipments filling stone with the largest particle diameter of not more than 60cm; b,spreads 40-70cm thick layer stone in the soft ground surface-paved; c,adopts hammer ram, use hammer ram tamping force to tamping stone layer by point tamping or separate tamping and plus tamping, tamping out 2-3m tamping pit in selected tamping spots ; d,for every tamping pit ,follows filling -- tamping.,filling -- tamping until the tamping the settlement is in less than 2-7 after consecutive 2-3 tamping, and then stops tamping. This invention squeezes the soft and mud silting open in the soft surface of 2-6 meters, achieves the purpose of squeezing mud replacement, and finally forms hard shell replacement layer of 2-6 m thickness, enhances the bearing capacity of the ground, increases the stability of the ground.

The invention discloses a railway engineering automation modeling method based on parameterization, and belongs to the technical field of building engineering modeling. The method specifically comprises the steps of obtaining environment information data and dimension model data; summarizing the data in EXCEL and introducing the data into cloud platform, depending on platform data, compiling a revit identifiable file by utilizing a C language program, and then automatically reading and generating a BIM model by utilizing the revit; using visworks software for collision inspection to correct the model. The defects that a traditional modeling period is long, cost is high, space attributes are not achieved, sharing is poor, huge data cannot smoothly run on common equipment, and the method isnot suitable for large-batch rapid modeling engineering are overcome. The purpose of one-key rapid batch modeling is achieved.

The invention discloses a construction method of the embedded orbit guide rail in the traffic engineering. It aims at providing a method suitable for the Chinese situation, which has simple and practicable construction technology, low cost and high efficiency. It has the following steps: after derusting, the guide rail takes U90 primer treatment on its bottom surface and side. The welding of the guide rail: implement gas pressure welding on the whole line long track and curved track whose curvature radius>200m. Adopt narrow clearance manual arc welding on the points zone and curved track with small curvature radius. Spray and bond primer P21 and pour epoxy resin on both sides of the rail ditch and the guide rail separately. The construction method reduces the difficulty in operation and cost and improves the construction efficiency. It ensures the construction quality and resolves the rail slot welding problem in the points zone effectively by establishing the effective and feasible welding process.

The embodiment of the invention discloses a rapid modeling method based on Revit, relates to the field of infrastructure engineering modeling, and is used for rapidly establishing a BIM model of a railway engineering project. The method comprises: establishing a railway engineering project BIM parameterized component family library; extracting component position coordinate information and geometric parameter information in the railway engineering project construction drawing to an Excel table; inputting railway engineering project management information through a researched and developed Revit-based railway engineering rapid modeling plug-in; and generating the BIM model according to the component position coordinate information and the geometric parameter information in the Excel table, so that rapid parametric modeling of the BIM model of the railway engineering project is realized, and the modeling efficiency and precision are improved.

The invention relates to a railway reinforced construction method, belonging to the technical field of railway engineering. The method comprises the following construction steps: reinforced concrete pile foundations are respectively manufactured at two sides of a line which affects the railway service; profile steel is arranged at the top of the pile foundation as a supporting beam after the concrete pile foundation reaches the required intensity; and reinforced steel rails are arranged at the top of the beam at interval along the railway sleepers for supporting the running railway. The railway reinforced construction method has the advantages that: the profile steel and the concrete piles are used for reinforcing the running railway according to the distance of the sleepers, the stress relations between the steel rail and the sleeper and between the sleeper and the road bed are transferred to the profile steel and the concrete pile which have the supporting function, so as to realize tunneling and excavation of the road bed of the railway. The production operation is not affected, valuable construction period for engineering construction is saved, the difficult problems of railway underground engineering construction and railway transportation confliction are effectively solved, and good economic technical benefits are obtained.

The invention relates to railway engineering application calculation and design techniques, discloses a method and a system for analyzing the longitudinal interaction of a longitudinal connecting plate type ballastless track and a bridge, and aims to provide important support to on-bridge longitudinal connecting plate type ballastless tracks and lower foundation design in different climate environments. The method comprises the following steps: respectively establishing a longitudinal connecting plate type ballastless track-bridge temperature field calculation model and a longitudinal connecting plate type ballastless track-bridge-bridge pier longitudinal interaction model; studying the interaction of a longitudinal connecting plate type ballastless track, a bridge and a bridge pier under longitudinal loads such as the longitudinal load of a train in service, the temperature of concrete of the ballastless track and the shrinkage load of concrete, the bridge temperature load, the plate breakage load and the broken track load by using the models. The method and the system are relatively fine as a mechanical model takes the cracking and closure effects of the cracks and longitudinal interaction of reinforced steel concrete into account, and are relatively complete as a load model takes different temperature characteristics of different climate environments into account.

The invention relates to a railway engineering pile foundation underpinning construction method, the procedures comprise reinforcing the ground, namely, a pedestrian bridge is supported by a steel pipe scaffold on the ground, and processing in a cave, firstly, concrete which is distributed on the surface layer of a pile is removed, secondly, enciphering grids are set up, thirdly, muscles are planted and formwork lining umbrella arch is poured, fourthly, piles are sectionalized and secondary lining concrete is poured, namely, when the formwork lining on the lower portion of support at primary stage achieves the intensity which is designed, base piles in tunnel lining is removed, and boundary agent is brushed, and a foam board bedding layer is further arranged, and a water-protecting layer is made, and space interval structure formwork lining is poured. The invention has the advantages that firstly, the monitor measure data of on site construction shows that the largest sedimentation of pile accumulation is 8047mm, and the largest discrepancy sedimentation is 291mm. Cracks are not founded during the construction period though the observation of a hat beam, and sedimentation of piles and bending deflection of the hat beam is designed in the regulated scope, and the deformation rule conforms to the design account, which fully shows that underpinning design of piles is reliable and safe, secondly, the invention saves investment.