97results about How to "Solve the reinforcement problem" patented technology

The invention discloses a beam-removing rib-increasing strengthening construction technology of a highway bridge. A bearing beam of a strengthened bridge comprises a plurality of hollow beam plates. The technology comprises the following steps: chiseling and removing an original collision prevention guardrail and a bridge face laying layer; eliminating a transverse connection hinge seam between the two adjacent hollow beam plates; hanging and moving the hollow beam plates and supporting reasonably; embedding ribs and pouring the pad stone of a supporting seat anew; checking, determining, recycling the hollow beam plates, repairing defects and processing cracks; sticking the beam bottoms of edge beams and strengthening steel plates; anew installing the hollow beam plates transversely at intervals; constructing rib beams which are added newly; constructing a steel bar net of the bridge face laying layer and embedding the steel bar of the collision prevention guardrail in advance; pouringthe concrete of the bridge face laying layer; and constructing the collision prevention guardrail and installing bridge face expansion joints. The invention has reasonable design, smaller execution difficulty, simple construction steps and low construction cost, has small damage to the original hollow beam plates, can enhance the bearing capacity of an original structure of a hollow plate bridge,has very good strengthening effect and can effectively solve the strengthening problem of the hollow plate bridge.

The invention relates to repair and reinforcement construction methods for segments in a formed tunnel. The segment repair construction specifically comprises steps as follows: 1, segment fragmentation classification identification; 2, selection of repair measures; 3 surface cleaning of segment fragmentation; 4, drilling and steel bar embedding; 5, interfacial agent brushing; 6, reinforcement mesh binding; and 7, polymer repair mortar application. The segment reinforcement specifically comprises steps as follows: 1, caulking, grouting and hand hole blocking; 2, steel plate processing and corrosion prevention processing; 3, mounting of a protective steel plate; and 4, epoxy resin grout filling. The construction methods can solve the repair and reinforcement problems after large-area fragmentation in a propulsion and assembly process of the tunnel, and ensures that the formed tunnel meets an operation safety requirement.

The invention discloses a soft soil foundation combined pile net structure, aims at effectively improving reinforcing effect and saving project investment and comprises cast-in-place piles, pressed piles, pile caps, guide fixing frame lattices and a cushion body. The cast-in-place piles are arranged around the boundary of a filling body at intervals, bottoms of the cast-in-place piles enter a bedrock layer below a soft soil layer by certain depth, the pressed piles are arranged in the soft soil layer within a range of the cast-in-place piles at intervals, bottoms of the pressed piles are pressed in the top surface of the bedrock layer, the pile caps are arranged at the tops of the cast-in-placed piles and the pressed piles and fixedly connected with the cast-in-placed piles and the pressed piles, the guide fixing frame lattices are positioned in the soft soil layer and transversely restrain the cast-in-place piles and the pressed piles, and the cushion body is laid between the tops of the piles caps and the undersurface of the filling body.

The invention discloses a pipe-jacking construction method for pipeline bottom grouting reinforcement. The method comprises the following steps that A, a working well and a receiving well are constructed in the direction of laying a pipeline, and a plurality of horizontal direction holes side by side are formed below the preset position, between the working well and the receiving well, of the pipeline; B, high-pressure grouting is carried out in all the horizontal direction holes to form cement and soil composite structure piles; C, the pipeline is jacked into the preset position through cement balancing pipe-jacking equipment. Horizontal direction drills are utilized for drilling the working well and the receiving well in the opposite directions at the same time, high-pressure jet grouting is carried out in the holes, the method for forming the cement and soil composite structure piles at the bottom of the pipeline is used for reinforcing a foundation, the effect that long-distance deep-embedded pipe-jacking construction is carried out in a sludge bottom layer with the high water content can be smoothly achieved, and the problem that vertical high-pressure jet grouting piles can not be adopted on the road surface can be solved smoothly. Good economic benefits and social benefits are obtained. Particularly, the benefits of the method are outstanding for the situation that deep foundation reinforcing can not be carried out conveniently on the road surface with the traffic jam.

A dual-liquid micro-disturbance grouting strengthening method for a soft-soil subway tunnel includes the step of grouting grout into soil. The grout is mixed by cement slurry and soluble glass, and the volume ratio between the cement slurry and the soluble glass is 2.5:1-3.0:1. The grout is grouted according to a principle of evenness, small amount, multiple points and multiple times, and each single grouting length ranges from 8.8 centimeters to 35.2 centimeters. Meanwhile, the tunnel sedimentation condition is monitored. Each single grouting process is completed via an order of stirring grout, installing a blowout preventer, pressing tubes, grouting, unplugging tube and closing a ball valve. As prediction of tunnel sunk or ridged deformations and field grouting control are integrated, the tunnel can be protected from deforming, the problem about strengthening of the substratum soil of the soft-soil subway tunnel can be solved, and the normal operating of the tunnel cannot be influenced. The dual-liquid micro-disturbance grouting strengthening method for the soft-soil subway tunnel can be widely applied to control of tunnel deformations and grouting of constructions of side-channels, pump stations, end wells and crosses during new line construction and transfer process.

A light mold component that is cast-in-place concrete. It includes polyhedron solid light material component. Its feature is that at least two polyhedrons solid light material component alternated arranged with each other, and forms inner pleura cavity. At least one alternated interval support and pull component alternated combined with each other by opposite or consecutive polyhedron solid light material component in the pleura cavity. It is suited for kinds of active pouring concrete or pre-stressing force reinforcing steel bar for building casing, wall, basis bottom board and bridge, especially suited for girderless building casing.

The invention relates to a device for reinforcing a tower crane in a coastal zone. The device is characterized by consisting of a plurality of connection rods, a plurality of connection pieces, a plurality of supporting rods, a plurality of steel ropes, a plurality of rectangular sleeves and a wind damper, wherein the rectangular sleeves are fixedly sleeved on a tower crane body, and the diameters of the rectangular sleeves are sequentially reduced from bottom to top; the steel ropes are connected between the adjacent rectangular sleeves; the wind damper is connected to the tower crane body by supporting the steel ropes; a wind damper body is positioned in the top rectangular sleeve and is in contact with hydraulic devices around the top rectangular sleeve; the supporting rods are arranged between the bottom rectangular sleeve and the ground and are connected with the connection rods arranged on the ground; and the connection rods are connected with the supporting rods through the connection pieces. By the device, if the height of the tower crane is greater than an independent height, the rectangular sleeves are arranged at the periphery of the tower crane, and the wind damper is arranged in the top rectangular sleeve; by the wind damper, most energy of wind can be counteracted; the swing degree of the tower crane is reduced; and the tower crane can be balanced.

The invention relates to a construction method, in particular to a reinforcement method for a shield tunnel segment. The method comprises the following steps of 1, engraving and rough chiseling treatment; 2, hole drilling and bar planting; 3, steel-bar net making; 4, cleaning; 5 humidification; 6, concrete spraying. The reinforcement method for the shield tunnel segment is quick in construction and low in cost, it can be ensured that a reinforced body and the segment are deformed in a coordination mode and stable in performance, the problem of reinforcing a shield tunnel after a large area of fragmentation occurs due to nearby construction in the propulsion process and in the operation process can be solved, and it is ensured that the tunnel meets the requirements for operation safety.

The invention discloses a 3D printed no-reinforcement horizontal bearing member comprising an upper flange, a lower flange, supporting rib plates, side face plates and web plates. The upper flange and the lower flange are parallelly arranged. The side face plates are arranged at the ends of the upper flange and the lower flange. The upper flange, the lower flange and the side face plates form a rectangular frame body. The web plates and the supporting rib plates are arranged between the upper flange and the lower flange. The web plates are perpendicular to the upper flange and uniformly arranged at intervals. The supporting rib plates are arranged in pairs and incline relative to the upper flange. The upper flange and the lower flange are separated from each other and far from the neutral axis through the supporting rib plates, so that the horizontal bearing member forms a uniform force bearing whole, and accordingly the tensile strength and the bending stiffness of the horizontal bearing member are improved. The provided 3D printed no-reinforcement horizontal bearing member is reasonable in structure and is printed through high-ductility concrete in a 3D mode, so that no reinforcement needs to be arranged, the tensile strength and stiffness of the bearing member are improved, the member reinforcement problem in a 3D printed building is solved, the applicability of the 3D printed building is improved, and the environment-friendly requirement is met.

The present invention relates to a T-type multifunctional small block and its production forming method. Said invention adopts T-shaped block type series and composite forming process to solve the problem of combination of several layer materials in the production of concrete small blocks, and greatly raise technical content and additional value of product, implement high prefabrication extent ofsmall blocks, improved reinforcement scheme of block and block bonding body, and can more flexibly and reaonsably arranged steel bar, can conveniently make construction and can flexibly form various structures with different forms, and can obviously raise strength of block hollow bonding body so as to raise quality and efficiency of building construction.

The invention discloses a novel construction method of a large-diameter composite structure pile consolidated foundation. The construction method is applicable to the consolidation of deep and weak foundations under "various complicated geological conditions and especially in the absence of bearing layers or bearing interlayers"; the construction method comprises the following steps: firstly, analyzing the foundation conditions of a region for construction to determine layer category partition of weak soil layers in the region and physical and mechanical properties of various layers; subsequently, carrying out targeted construction scheme design, and then driving a consolidation pile composed of an inner-layer pile body, a middle-layer meshed cylinder and an outer-layer water-permeable geomembrane into the region for construction until the bottom end of the consolidation pile extends into the weak foundation by not less than 10m; after the construction of the consolidation pile is finished, forming by pouring a pile cap at the top end of the consolidation pile, laying a composite spacer and carrying out subgrade filling, and finally, carrying out the construction of an upper structure layer. The novel construction method is applicable to solve the consolidation problems of deep and weak soil foundations under various complicated difficult conditions and especially in the severe absence of bearing layers, and further has the advantages of less number of pile bodies, shorter consolidation period, faster construction progress and lower construction cost.

The invention provides a device for identifying malicious codes. The device comprises: a detection application module used for system initialization, a process injection module used to perform injection on a system process and load an API HOOK dynamic library in an operation process of a terminal which is installed with an Android system, a monitoring module used to monitor a sensitive API throughAPI HOOK and outputting behavior monitoring vectors, and a detection service module used to analyze the behavior monitoring vectors and identify threatening behaviors. Through behaviors when malicious codes operate, malevolence of the codes can be determined, bottleneck when static malicious code detection encounters malicious code reinforcing is solved, and bottleneck that unknown malicious codes cannot be identified. Since a dynamic injection API HOOK technology is used, malicious code identification and blocking can be realized on the basis that source codes are not modified, and problemsof long development period and poor portability existed in a malicious code detection technology which identifies based on behaviors modifying system source codes are solved.

Disclosed is a method of pasting a carbon fiber sheet on an inner wall of a large-diameter pipeline. The first tier of the carbon fiber sheet is pasted by a carbon fiber cloth (2), and the pasting of the carbon fiber cloth (2) comprises the steps of rubbing down an inner wall of a pipeline (1), keeping the surface of the inner wall of the pipeline (1) clean and arid, smearing uniformly a subbing glue on the inner wall of the pipeline (1), and using hands to gently press and paste the carbon fiber cloth (2) on a pasting area after the surface of the subbing glue is dry to touch or the surface of a leveling glue is dry to touch, installing a support device, dismantling the support device, adopting an angle grinder to grind carbon fiber cohesive glue which is squeezed out by the carbon fiber cloth (2), thus guaranteeing levelness of an entire structure plane. The method of pasting the carbon fiber sheet on the inner wall of the large-diameter pipeline realizes reinforcing of the inner wall of the large-diameter pipeline (1) which is buried underground, thus solving the problem of reinforcing the large-diameter pipeline buried underground.

The invention relates to a treatment method of the bedding soft soil of existing circular shield tunnel aiming to solve the technology issue on the stratum subsiding of the auger ground, which relates to the civil construction technology field. The method comprise: drilling downward two eudipleural grouting pipes in the left and right sides of the circular shield tunnel; compelling the spoil disposal with the adaptation of MJS construction method from the bottom to the top; reinforcing the concrete and slurry with the swing grouting method; and forming concrete reinforced bodies in the left and right of the bottom-left of the circular shield tunnel and the bottom-right of the circular shield tunnel. The method won't ruin the existing circular shield tunnel and can solve the stratum subsiding of the auger ground.

The invention relates to a strengthening method for stress on a single plate by using steel reinforced concrete. The strengthening method comprises the following steps. Firstly, U-shaped steel with flanges is pressed according to the length and the structure of a single-span bridge, and through holes are arranged on the steel flanges. Secondly, roughening on surface concrete is performed on base boards of two sides of a hinge joint of a hollow plate, and drilling is performed on the base boards according to hole positions of the steel flanges of the U-shaped steel with the flanges. A drilled hole is cleaned, and an anchoring screw rod is planted in the through hole. Fourthly, the U-shaped steel with the flanges is arranged on the hollow board in an anchoring and sticking mode, and concrete is poured in the hinge joint of the hollow board. According to the strengthening method for stress on the single plate by using the steel reinforced concrete, the hollow plate is strengthened from two aspects of improving integral stress and single beam bearing capacity. Integrity is increased, transverse arrangement of loads is improved, bearing capacity of a single beam is improved, and stress strengthening of the single plate of the hollow board with a small hinge joint is achieved.

The invention discloses a coal mine surrounding rock control method based on chemical modification. Firstly, a rock mass required to be modified (hard rock stratum or fractured surrounding rock) is subjected to drilling construction, and then chemical reagents (softeners or hydrochloric acid and sodium carbonate are combined) are injected into a borehole, so that the hardness and integrity of therock mass is changed, namely that the rock mass is weakened or hardened; the situation that the hard rock stratum forms a large unsupported roof behind a working face is avoided; the first roof weighting pace and the periodic roof weighting pace is reduced, so that the accidents of air impact and roof impact caused by instantaneous caving of a hard roof behind the working face are avoided; the problems of accumulative energy release and stress transfer of a tunnel roof, and a coal seam hard roof required to be weakened near other tunnels are solved, and meanwhile the problems of loose and fractured surrounding rock mass strengthening are solved; and thus, the subsequent safe mining of a coal roadway is ensured effectively. In addition, the method is simple, low in cost, easy to use, and high in practicability.

The invention relates to the technical field of civil construction, in particular to a treatment method for a soft soil foundation of an existing shield rectangular tunnel. The technical problem of tunnel underlying soft soil stratum settlement is solved. The method includes the steps that two grouting pipe holes are drilled downwards in the left side and the right side of the shield rectangular tunnel from the ground in a bilaterally symmetrical mode separately, and forced mud discharging is carried out from bottom to top through an MJS construction method; and meanwhile concrete slurry swing spraying reinforcement is carried out on a stratum, and a left concrete reinforcement body and a right concrete reinforcement body for supporting the lower left portion and the lower right portion of a concrete cushion of the bottom of the shield rectangular tunnel are formed. By means of the method provided by the invention, the existing shield rectangular tunnel structure cannot be destroyed, and the problem of tunnel underlying soft soil stratum settlement can be solved.

The invention relates to a construction tower crane temporary set-up attachment. The construction tower crane temporary set-up attachment comprises a tower crane tower body, and further comprises at least two attachment bases located on the same side of the tower crane tower body. A base anchoring ring is fixed to each attachment base. A tower body anchoring ring I is fixed to the position, located on the same plane as each base anchoring ring, of the tower crane tower body. A tower body anchoring ring II is further fixed to the position, above or below each tower body anchoring ring I, of the tower crane tower body. Two horizontal attachment rods are at least hinged between the corresponding tower body anchoring ring I and each base anchoring ring. Fixed rods are fixed between the horizontal attachment rods on the adjacent base anchoring rings. Inclined attachment rods are hinged between the fixed rods and the tower body anchoring rings II. The construction tower crane temporary set-up attachment is set up firmly and can be set up according to deep foundation pits and narrow places around the foundation pits, and the problem of tower crane reinforcing is effectively solved.

The invention relates to a tunnel arch foot circumferential high pressure jet strengthening method and a construction equipment. The construction equipment comprises a rack guide rail, a rack, an arc slideway, a movable sliding frame, a fixed sliding frame, a hydraulic oil cylinder, an arc drill rod, a high pressure pump station and a hydraulic pump station, wherein the feeding and retracement of the arc drill rod are controlled by the hydraulic oil cylinder; when the arc drill rod is fed, the hydraulic pump station jets high pressure water; when the arc drill rod is retraced, high pressure cement paste is jet through high pressure; and a left overlapping region, a left side circumferential strengthening bottom plate, a middle overlapping region, a right side circumferential strengthening bottom plate and a right overlapping region form a closed strengthening circle at the bottom part of a tunnel, thus effectively solving the strengthening problems of a tunnel arch foot and an inverted arch part under the condition of weak surrounding rocks and particularly saturated silt-fine stones.

The invention relates to a prestressed anchor bolt fan foundation reinforcement method. The prestressed anchor bolt fan foundation reinforcement method comprises the steps that for a prestressed anchor bolt fan foundation with design defects and quality problems, original foundation pier concrete is chiseled away, vertical reinforcements and radial reinforcements extending into a column pier partof an original foundation are reserved, and half of original prestressed anchor bolts are reserved at intervals; the reserved original prestressed anchor bolts are lengthened to form new lengthened anchor bolts; a plurality of circles of vertical embedded reinforcements are arranged on a cantilever plate part of the original foundation; and a new upper foundation reinforcement cage is placed on the reserved original foundation, upper foundation concrete is poured, and the reinforcement cage includes an upper foundation pier and a cantilever plate. The upper foundation is effectively anchored by the reserved vertical reinforcements, the radial reinforcements, the lengthened anchor bolts and embedded reinforcements. Meanwhile, the new prestressed anchor bolts are embedded in the upper foundation pier, a bottom tower barrel is connected with the reinforcement foundation through the lengthened anchors and the new prestressed anchor bolts, the rigidity of a joint is ensured by applying prestress through the lengthened anchor bolts and the new prestressed anchor bolts, and reinforcement of the prestressed anchor bolt fan foundation is realized.

One kind Tong with the empty stomach component, including the empty stomach form (1), its characteristic lies in at least two empty stomach form (1) alternates with the arrangement, the empty stomach form (1) between the opposite constitution cast-in-place Tong in rib cavity (2), in the rib cavity (2) center has the form (1) alternates with to or the neighboring surface empty stomach joins a body at least a gap brace to pull (3), in the rib cavity (2) center also the opposite pulls with the gap brace (3) is the whole gap prefabrication module (4), Gap prefabrication module (4) and empty stomach form (1) other wall companies are the wholes. Thus, when the empty stomach component applies to cast-in-place the hollow ceiling, does not affect the hollow ceiling the construction quality, simultaneously constructs the efficiency also greatly to enhance, moreover, because in the rib cavity the opposite and the gap brace pull for the whole gap prefabrication module, thus the empty stomach component manufacture is easier, the intensity is higher, is suitable for each kind cast-in-place or the prestressed rinforcement Tong hollow ceiling, the room lid, the foundation ledger wall, the wall, the empty stomach bridge use, specially uses in the hollow beamless roof use.

The invention provides an integrated supporting system for connection of fabricated shear walls and a laminated slab and a mounting method of the integrated supporting system. Nuts pre-embedded in theprefabricated shear walls are used as fulcrums to support the prefabricated laminated slab without the dependence of the edge widths of the shear walls, vertical supports on the lower portion of thefloor slab are omitted, accordingly, formwork erecting difficulty is lowered, the cost is saved, and construction precision can be met. Meanwhile, supports of the supporting structure are concentratedly arranged at the top of the structure, and bottom supports are omitted so that a large quantity of spaces can be provided for activities of bottom personnel. Few mounting personnel are needed for supporting frames of the supporting structure, on-site operation is also easy relatively, and the construction problems of connection of the shear walls and the laminated slab and supporting of supporting plates can be solved effectively.

The invention discloses a high-strength supporting and protection structure of a subway tunnel. The structure includes a cloth bag template, an inner bracing steel rib, an outer bracing steel rib, filling concrete and a pouring stone body, and is characterized in that the cloth bag template is divided into an inner layer and an outer layer, the two ends of the cloth bag template are sealed, and one sealed end is provided with a slurry injection port and a venting hole; a plurality of slurry injecting short pipes communicated with the exterior and the interior are arranged on the cloth bag template, and distributed along the cross section of the cloth bag template in an annular mode; the part, close to the slurry injecting short pipes, of the interior of the cloth bag template is provided with the inner bracing steel rib and the outer bracing steel rib; the filling concrete is the concrete stone body in the cloth bag template; the pouring stone body is the slurry stone body which is incontact with tunnel surrounding rock and positioned outside the cloth bag template. By adopting a method of injecting slurry in the template and outside the template, the intensification problem of aweak broken stratum which a tunnel is about to penetrate though can be solved, the high-strength supporting and protection structure is simple and convenient to construct, the intensification effect of the weak broken stratum can be improved, and the loading capability of a subway tunnel supporting and protection system can be improved.

A hollow component for concrete includes a hollow mould shell (1), characterized in that at least two hollow mould shells (1) are spacingly arranged, a cast-in-situ concrete inner rib mould cavity (2) is constructed between the opposite faces of the hollow mould shells (1), at least one space drawing part (3) for interphasely connecting the opposite or neighboring solid and light material components of polyhedron (1) to an integer is provided in the inner rib mould cavity (2), one pore space (4) for casting the reinforced concrete cast-in-situ throughout upper and lower surfaces of the hollow mould shells (1) is provided on each hollow mould shell. The hollow component for concrete is adapted to use for hollow bridge, wall body, basic slab, room cover and hollow building cover of various of reinforced concrete cast-in-situ or prestressed reinforced concrete, especially use for the hollow building cover without beam.

The invention discloses a foundation reinforcement and connector combination of an integral floating water taking head and a construction method. The foundation reinforcement and connector combination comprises a water taking head foundation. The water taking head foundation is reinforced by the aid of rock-socketed cast-in-place piles and is excavated, and rubble is filled back into the water taking head foundation; pile sleeves are arranged at the bottom of the water taking head, underwater concrete is filled into gaps of the pile sleeves of the rock-socketed cast-in-place piles via reserved grout pipes, and the rock-socketed cast-in-place piles are nested in the water taking head. The construction method includes a, reasonably arranging the rock-socketed cast-in-place piles according to actual conditions of the water taking head and computation results and reinforcing the foundation; b, excavating a foundation region of the water taking head and filling the rubble into the foundation region; c, arranging the pile sleeves for sleeving the rock-socketed cast-in-place piles at the bottom of the water taking head and reserving the grout pipes when the water taking head is manufactured; d, temporarily plugging the reserved grout pipes of the water taking head; e, filling the underwater concrete from the tops of the reserved grout pipes into the nesting gaps of the rock-socketed cast-in-place piles nested in the water taking head.

The invention discloses a bridge structure optimization method and system based on vehicle load and intelligent equipment. The bridge structure optimization method comprises the steps: obtaining the structure information of a to-be-optimized bridge, and building a finite element analysis model of the to-be-optimized bridge according to the structure information; according to the multi-lane distribution characteristics of the traffic flow and the road grade of the bridge, creating differentiated vehicle load standards and models of all lanes; loading the differentiated vehicle load model of each lane to a to-be-optimized bridge structure for analysis so as to determine bridge member response of each lane position; and determining the structure, the size and the material of the bridge memberat each lane position based on a target reliability least square error principle according to the bridge member response so as to obtain an optimized bridge structure of the current bridge, and carrying out a vehicle loading test on the optimized bridge structure of the current bridge. According to the bridge structure optimization method, the bridge components at all lane positions can have consistent reliability under the action of different lane loads, and the actual application requirements are met.

The invention discloses a concrete filled steel tubular column steel-reinforced concrete beam ring beam joint formwork reinforcing piece which comprises a first conical sleeve, a round steel pull rod,a steel flat belt, an arc formwork, arc-shaped double square tubes and a T-shaped connecting rod. The first conical sleeve is connected with a steel column in a welded mode, screw threads are arranged at the two ends of the round steel pull rod, one end of the round steel pull rod is in threaded connection with the first conical sleeve, and the other end of the round steel pull rod is in threadedconnection with a second conical sleeve of the T-shaped connecting rod; the arc formwork is an arc-shaped clear water formwork; the arc-shaped double square tubes are two square tubes with radian; the T-shaped connecting rod comprises a T-shaped round steel main rod, the second conical sleeve is welded to the end, a main stress rod is sleeved with a first nut and perforated channel steel, and a perforated hole is formed in the middle of the perforated channel steel. The round steel pull rod is installed after ring beam span joint steel bars are installed, the influence on steel bar installation can be avoided, and the steel bar installation efficiency is improved; and the arc-shaped steel flat belt with the self-locking function, the problem that a splicing seam of a side mold and a bottom mold is not tight is solved.

The invention relates to the field of building construction, in particular to a construction method for reinforcing an underground outer wall formwork in a complex limited space in a foundation pit. The construction method for reinforcing the underground outer wall formwork in the complex limited space in the foundation pit comprises the following steps of manufacturing a concrete prefabricated outer wall formwork, wherein the height is the floor height, grouting sleeves are arranged at the bottom, a plurality of bolts are pre-buried, and matched screw holes are formed in an inner side formwork; pre-burying a row of vertical steel bars on the outer side of an underground outer wall, wherein the distance of the vertical steel bars is consistent with the distance of the grouting sleeves; hoisting the prefabricated outer wall formwork, enabling the grouting sleeves to be aligned with raft vertical steel bars, adjusting the prefabricated outer wall formwork to be perpendicular to the horizontal plane, and fixing through an inclined support; conducting grouting through the grouting sleeves; binding concrete wall steel bars; dismantling the inclined support, erecting an inner side formwork, enabling the bolts to penetrate through the screw holes, and screwing the nuts for reinforcement; pouring a concrete wall body; and after final setting, dismantling the inner side formwork, then dismantling the exposed parts of the bolts, and repairing the surface of the concrete wall body. The construction method for reinforcing the underground outer wall formwork in the complex limited space in the foundation pit provided by the invention solves the problem that when an operation surface is insufficient, constructors cannot reinforce the underground outer wall structure formwork.