A high-precision counterforce wall construction method

Abstract

The present application relates to the field of civil engineering structure seismic test, especially to a high-precision counter-force wall construction method. The high-precision counter-force wall construction method comprises the following steps: step one, making a rotating base, the counter-force wall is horizontally constructed in situ on the rotating base, and the surface flatness of the counter-force wall is controlled by using a laser leveling machine; step two, after the counter-force wall is maintained and the quality is detected to be qualified, the horizontally arranged counter-force wall is rotated on the rotating base to adjust the counter-force wall from horizontal to vertical, and the counter-force wall is positioned and fixed; step three, after the counter-force wall is rotated and positioned, the counter-force wall is connected with the rotating base and the counter-force base by concrete pouring, and is maintained until the quality is detected to be qualified. The present application avoids the traditional vertical construction method of the counter-force wall, and the counter-force wall is first horizontally constructed and then rotated to the vertical state. Since the flatness of the counter-force wall needs to be more accurately controlled, the counter-force wall can be accurately controlled by using the laser leveling machine during the horizontal construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of seismic test of civil engineering structure, and particularly relates to a high-precision reaction wall construction method. BACKGROUND

[0002] With the development of scientific research technology, the reaction wall structure as an important test facility of the structural laboratory is built in various colleges and universities in China, and is used for researching the seismic performance and wind resistance performance of the structure. The reaction wall structure, the measuring system, the force adding system, the calculation and monitoring system and the reaction pedestal jointly constitute a pseudo-dynamic test device.

[0003] As a special structure, according to the existing literature, the maximum lateral deflection of the top of the reaction wall can be referred to 1 / 1000H, 1 / 1800H, 1 / 2000H and 1 / 3000H. Considering the actual loading of the laboratory, the tonnage and arrangement of the actuator acting on the reaction wall, the lateral deflection is controlled within 1 / 1800H, that is, the maximum lateral displacement of the top of the wall is 1 / 1800 of the height of the reaction wall. The wall thickness of the wall body is generally 300mm to 600mm according to the load working condition. The reaction wall needs to bear a large static or dynamic load, and the requirements for deformation, strength and crack control level are very high. In actual engineering, prestress is usually applied to control the lateral stiffness of the reaction wall while avoiding excessive increase in the thickness of the wall body. During the test loading process of the reaction wall structure, a large bending moment and shear force are generated at the root of the wall. Therefore, in order to ensure the constraint of the reaction wall, the thickness of the box-type pedestal has certain requirements. The common box bottom thicknesses are 550mm, 600mm and 800mm, among which 800mm is the most common.

[0004] The control of surface flatness is one of the indicators for measuring the construction quality of the reaction wall and the box-type pedestal. At present, there is no clear construction specification in China. The methods of the built test rooms are summarized as follows: the allowable deviation of the flatness of the box-type pedestal and the reaction wall is ±2mm, the verticality of the reaction wall is ±10mm, the horizontal deviation of the reaction wall is ±5mm, the longitudinal deviation of the pedestal is ±10mm, and the allowable deviation of the hole distance of the embedded loading hole is 2mm. After investigating many test rooms in colleges and universities, it is found that the construction quality requirement of the reaction wall is very high, and the common problems in construction are that the flatness of the interface between the upper and lower layers of concrete does not meet the standard, and the deviation is about 10mm. However, the deviation of the flatness of the wall surface can be controlled within 2mm by appropriate control. The flatness deviation can be controlled within 3mm by setting the steel fixed loading hole embedded part in the panel or reinforcing the wall formwork with external supports and then constructing and pouring by layers. The hole distance deviation of the loading hole is controlled within 2mm. There are hundreds of loading holes on the wall body and the pedestal panel of the reaction wall, and there is little design data about the loading hole. Most of the design data are designed by referring to the design data of the existing reaction wall. However, the single-hole bearing capacity given in the literature is 125kN, 150kN, 250kN, 300kN and 500kN, among which 300kN is the most common. The hole distance of the loading hole is mostly 500mm. According to the structural characteristics of the actuator, four holes are simultaneously stressed. However, the size of the loading hole has not been studied in detail.

[0005] In summary, the construction index of the general reaction wall is controlled as follows:

[0006] (1) The flatness of the test pedestal platform is controlled within ±2mm / 2m, the flatness of the reaction wall surface is controlled within ±2mm / 2m, the verticality is controlled within ±2mm / 3m, the wall body is poured with fair-faced concrete, and secondary plastering is strictly prohibited.

[0007] (2) The embedded loading hole on the test pedestal and the reaction wall is made, and the length deviation of the loading hole is controlled within ±1mm, and the flatness of the end plate is controlled within ±0.5mm.

[0008] (3) The factory manufacturing error of the positioning support of the loading hole steel in the test pedestal and the reaction wall should be controlled within ±2mm, and the positioning and installation accuracy should be controlled within ±4mm.

[0009] (4) The installation deviation of the loading hole in the test pedestal and the reaction wall is controlled within ±1mm.

[0010] Therefore, a new construction method needs to be researched to solve the construction quality control problem of the reaction wall, so as to ensure the integrity of the wall body, the positioning accuracy of the embedded part, the strength and flatness of the structure surface. SUMMARY

[0011] In view of this, the purpose of the present application is to provide a high-precision counterforce wall construction method, which ensures the integrity of the wall, the positioning accuracy of the embedded parts, the strength and flatness of the structure surface, and avoids the lack of coordination or insufficient precision of the measurement system and force adding system equipment and facilities in the later stage, thereby affecting the experimental research.

[0012] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0013] The high-precision counterforce wall construction method comprises the following steps:

[0014] Step one, make a rotating base, the counterforce wall is constructed horizontally in situ on the rotating base, and a laser leveling machine is used to control the flatness of the surface of the counterforce wall;

[0015] Step two, after the maintenance and quality detection of the counterforce wall are qualified, the horizontally arranged counterforce wall is rotated on the rotating base to adjust the counterforce wall from horizontal to vertical, and the counterforce wall is positioned and fixed;

[0016] Step three, after the counterforce wall is rotated and positioned, the concrete is poured and connected with the rotating base and the counterforce base, and maintenance is carried out until the quality detection is qualified.

[0017] Further, before pouring, a counterforce wall formwork is erected on the rotating base, the counterforce wall formwork comprises an outer formwork frame and two horizontally and interval arranged inner formwork frames arranged in the outer formwork frame; the counterforce wall comprises an inner side wall, a transverse partition wall and an outer side wall, a plurality of loading holes are pre-embedded in the inner side wall, and during construction, high-flow self-compacting shrinkage-compensating concrete is used to pour twice, first, the transverse partition wall and the outer side wall of the counterforce wall are poured in the pouring cavity formed by the outer formwork frame, and then the inner side wall is poured and formed in the inner side wall pouring cavity formed between the outer formwork frame and the inner formwork frame based on the poured outer side wall, and maintenance is carried out, thereby completing the pouring construction of the counterforce wall.

[0018] Further, the outer formwork frame comprises a bottom formwork and a side formwork, the rotating base is provided with a horizontal support leveling system, the horizontal support leveling system comprises a plurality of leveling hydraulic cylinders arranged at intervals along the length direction of the counterforce wall, and a support back rabbet is arranged between the driving end of all the leveling hydraulic cylinders and the bottom formwork; each leveling hydraulic cylinder is connected with a displacement and stress monitoring system for adjusting the levelness of the bottom formwork; the laser leveling machine is used to control the elevation of the surface of the counterforce wall, comprising a laser emitter, a laser receiver and a leveling scale rod, the laser emitter emits laser at a set frequency to form a laser beam control plane, then a leveling scale rod is erected on the ground design elevation leveling control point, the laser beam is locked by the leveling positioning head on the leveling scale rod through the leveling positioning head, and finally the laser receiver on the laser leveling machine is adjusted to control the working elevation of the leveling head through the computer system inside the laser leveling machine.

[0019] Further, the rotating shaft is arranged on the rotating pedestal, the rotating shaft is fixedly connected with the outer formwork frame, a plurality of jacking supports are arranged on the rotating pedestal at one side of the rotating shaft along the length direction of the rotating pedestal, a pulling back support is arranged on the rotating pedestal at the other side of the rotating shaft, a jacking support point is arranged on the bottom formwork at the position corresponding to each jacking support, a hydraulic jacking rotating oil cylinder is detachably connected between the jacking support point and the corresponding jacking support, a pulling back support point is arranged on the side formwork corresponding to the pulling back support, and a hydraulic pulling back rotating oil cylinder is detachably connected between the pulling back support point and the corresponding pulling back support; the counterforce wall rotates around the axis of the rotating shaft, when rotating, the hydraulic jacking rotating oil cylinder farthest from the rotating shaft reaches the jacking limit position first, the hydraulic jacking rotating oil cylinder is removed after reaching the jacking limit position, and a length-adjustable support rod is connected between the jacking support point corresponding to the jacking hydraulic oil cylinder and the jacking support, and the remaining jacking hydraulic oil cylinders are cycled according to the above steps until the counterforce wall is rotated to the vertical position.

[0020] Further, a plurality of reserved holes are arranged on the counterforce pedestal, and inclined supports are arranged in the reserved holes and used for supporting the counterforce wall in the vertical state.

[0021] Preferably, the active stroke of each hydraulic jacking rotating oil cylinder is equal.

[0022] Preferably, the inner side of the side formwork at the root of the counterforce wall is provided with a pattern structure.

[0023] Further, the counterforce wall structure bottom is consolidated between the rotating pedestal and the counterforce pedestal, the consolidation node is composed of three parts of anchor bolt connection, gap filling and sealing and external wrapping; the anchor bolt connection is that anchor bolts are pre-buried on the rotating pedestal at the parts opposite to each other when the counterforce wall is rotated to the vertical state, and positioning holes are reserved in the corresponding positions when the counterforce wall is poured, so that each anchor bolt can be inserted into the reserved positioning hole when the counterforce wall is rotated to the vertical position; the gap filling and sealing is that the gap between the counterforce wall and the rotating pedestal is sealed and filled with grouting material; the external wrapping is that the reinforcing steel bars are reserved on the rotating pedestal and the counterforce pedestal, after the counterforce wall is fixed in place, the reserved reinforcing steel bars and the counterforce wall reinforcing steel bars are connected and high-flow self-compacting shrinkage-compensating concrete is poured to wrap the root of the counterforce wall.

[0024] The high-precision counterforce wall construction method has the following advantages:

[0025] 1. The high-precision counterforce wall construction method avoids the traditional counterforce wall vertical construction method, and instead, the counterforce wall is first horizontally constructed, and then rotated to a vertical state. Since the flatness of the counterforce wall needs to be more accurately controlled, the laser leveling machine can be used to control the horizontal construction of the counterforce wall. Once the laser system of the laser leveling machine is initialized, as long as the laser emitter is not disturbed, no matter where the laser leveling machine moves, the ground elevation will always be controlled by the plane formed by the rotating laser beam emitted by the laser emitter, ensuring the flatness and accuracy of the large-area and integrally-poured counterforce wall.

[0026] 2. The counterforce wall is poured twice, making it easier to control the pouring quality. The inner formwork frame can be supported based on the part of the counterforce wall after the first pouring, simplifying the structure of the inner formwork frame and reducing the number of corresponding components, thereby reducing the cost.

[0027] 3. The displacement and stress monitoring system can be connected to each leveling hydraulic cylinder and each hydraulic jacking and rotating oil cylinder, allowing real-time adjustment of each leveling hydraulic cylinder and each hydraulic jacking and rotating oil cylinder, ensuring the levelness of the bottom formwork during concrete pouring, and further ensuring the flatness and accuracy of the surface of the counterforce wall, as well as the verticality of the counterforce wall. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a plan view of the counterforce wall constructed in the high-precision counterforce wall construction method of the present application;

[0029] Figure 2 is a horizontal construction process schematic diagram of the counterforce wall in the high-precision counterforce wall construction method of the present application;

[0030] Figure 3 is a rotating construction process schematic diagram of the counterforce wall in the high-precision counterforce wall construction method of the present application;

[0031] Figure 4 is a schematic diagram of the counterforce wall in the high-precision counterforce wall construction method of the present application when the counterforce wall is vertically positioned;

[0032] Figure 5 is a schematic diagram of the counterforce wall root consolidation treatment in the high-precision counterforce wall construction method of the present application.

[0033] The drawings show that: 1 is a counterforce wall, 2 is a transverse partition wall, 3 is an inner side wall, 4 is an outer side wall, 5 is a rotating pedestal, 6 is a counterforce pedestal, 7 is a loading hole, 8 is an outer formwork frame, 9 is an inner formwork frame, 10 is a bottom formwork, 11 is a side formwork, 12 is a leveling hydraulic cylinder, 13 is a supporting backrest, 14 is a rotating shaft, 15 is a pulling back support, 16 is a hydraulic jacking and rotating oil cylinder, 17 is a jacking support, 18 is a hydraulic pulling back and rotating oil cylinder, 19 is an inclined support, 20 is an anchoring bolt, 21 is a reinforcing backrest, and 22 is a reserved hole. DETAILED DESCRIPTION

[0034] The application will be described in further detail below with reference to the drawings and specific embodiments.

[0035] The high-precision counterforce wall construction method of the application has the following steps:

[0036] The counterforce wall constructed by the high-precision counterforce wall construction method of the application is shown in Figure 1 The counterforce wall 1 includes an inner wall 3, a cross wall 2 and an outer wall 4. The two counterforce walls 1 are arranged in an L shape on the counterforce pedestals 6, and the inner wall of the counterforce wall 1 and the counterforce pedestals 6 are each provided with a plurality of loading holes 7 arranged in a rectangular array in the corresponding areas.

[0037] As shown in Figures 1 to 5 The high-precision counterforce wall construction method includes the following steps:

[0038] Step one, a rotating pedestal 5 is made, the counterforce wall 1 is horizontally constructed in situ on the rotating pedestal 5, and a laser leveling machine is used to control the flatness of the surface of the counterforce wall;

[0039] Step two, after the counterforce wall 1 is maintained and the quality is detected to be qualified, the horizontally arranged counterforce wall 1 is rotated on the rotating pedestal 5 to adjust the counterforce wall 1 from horizontal to vertical, and the counterforce wall 1 is positioned and fixed;

[0040] Step three, after the counterforce wall 1 is rotated and positioned, the counterforce wall 1 is connected with the rotating pedestal 5 and the counterforce pedestal 6 by pouring concrete, and is maintained until the quality is detected to be qualified.

[0041] Specifically, when the counterforce wall is horizontally constructed in step one, as shown in Figure 2 a counterforce wall formwork needs to be erected on the rotating pedestal 5. In this embodiment, the counterforce wall formwork includes an outer formwork frame 8 and two horizontally and spacedly arranged inner formwork frames 9 arranged in the outer formwork frame 8. Since the counterforce wall includes the inner wall 3, the cross wall 2 and the outer wall 4, in order to facilitate construction, in this embodiment, the counterforce wall 1 is poured by using high-flow self-compacting shrinkage-compensating concrete in two times. First, the cross wall 2 and the outer wall 4 of the counterforce wall 1 are poured in the pouring cavity formed by the outer formwork frame 8, and are poured to a set height and maintained, then the inner formwork frame 9 is erected on the basis of the poured outer wall 4, and the inner wall is poured and formed in the inner wall pouring cavity formed between the outer formwork frame 8 and the inner formwork frame 9, and is maintained, thereby completing the pouring construction of the counterforce wall. It should be noted that Figure 2Only the simple schematic diagram of the counterfort formwork, in practice, the outer formwork frame 8 and the inner formwork frame 9 both include the side formwork 11 made of 4mm thick steel plate, the reinforcing back 21, the keel and the outside corner lock. Since the inner formwork frame 9 is based on the outer side wall 4, the inner formwork frame 9 is not provided with the bottom formwork, while the outer formwork frame 8 includes the bottom formwork 10. The inner side of the side formwork 11 at the root of the counterfort 1 is provided with a pattern structure for rough treatment of the contact surface.

[0042] In order to ensure the counterfort to be horizontal during pouring, the horizontal support leveling system is provided on the rotating pedestal 5. As shown in Figure 2 , the horizontal support leveling system includes a plurality of leveling hydraulic cylinders 12 arranged at intervals along the length direction of the counterfort 1, and the driving end of all the leveling hydraulic cylinders 12 is provided with the support back 13 between the bottom formwork 10. Each leveling hydraulic cylinder 12 is connected with a displacement and stress monitoring system for adjusting the levelness of the bottom formwork 10. The leveling here is divided into two processes, the first is the leveling of the bottom formwork 10 after the outer formwork frame 8 is supported, and the second is that during pouring of the concrete, the concrete generates pressure on the bottom formwork 10, which in turn causes slight changes in the position of the bottom formwork 10 at the support of each leveling hydraulic cylinder 12, at which time the displacement and stress monitoring system can control each leveling hydraulic cylinder 12 in real time, and finally ensure the bottom formwork 10 to be horizontal during pouring.

[0043] In addition, during pouring of the concrete, the laser leveling machine is used for pouring and paving of the concrete, and then the elevation of the surface of the counterfort is controlled. The laser leveling machine is a prior art, including a laser emitter, a laser receiver and a level rod, the laser emitter emits laser at a frequency of 10 times per second to form a laser beam control plane, then a level rod is erected on the ground design elevation control point, the laser beam is locked by the level positioning head on the level rod through the level positioning head, and finally the laser receiver on the laser leveling machine is adjusted, and the working elevation of the leveling head is controlled through the computer system inside the laser leveling machine. Since the laser emitter is independently set, once the laser system is initialized, as long as the laser emitter is not disturbed, no matter where the laser leveling machine moves, the ground elevation is always controlled by the plane formed by the rotating laser beam emitted by the laser emitter, which ensures the levelness and flatness of the large-area and integral paving counterfort.

[0044] As shown in Figure 3As shown, the rotating shaft 14 is rotatably arranged on the rotating pedestal 5, and the rotating shaft 14 is fixedly connected with the outer formwork frame 8, so that the outer formwork frame 8 can rotate relative to the rotating pedestal 5. A plurality of jacking supports 17 are arranged on the rotating pedestal 5 at the right side of the rotating shaft 14 along the length direction of the rotating pedestal 5, and corresponding pulling back supports 15 are arranged on the left side of the rotating shaft 14. The bottom formwork 10 is provided with jacking support points corresponding to the jacking supports 17, and a hydraulic jacking swivel oil cylinder 16 is hingedly connected between each jacking support point and the corresponding jacking support 17, and the two ends of the hydraulic jacking swivel oil cylinder 16 can be respectively detached from the jacking support 17 and the jacking support point. Similarly, the side formwork 11 of the outer formwork frame 8 close to the pulling back support 15 is provided with a pulling back support point corresponding to the pulling back support 15, and a hydraulic pulling back swivel oil cylinder 18 is hingedly connected between the pulling back support point and the corresponding pulling back support 15, and the hydraulic pulling back swivel oil cylinder 18 can be respectively detached from the pulling back support 15 and the pulling back support point.

[0045] The hydraulic jacking swivel oil cylinder 16 and the hydraulic pulling back swivel oil cylinder 18 are connected with a displacement and stress monitoring system. The counterfort wall 1 rotates around the axis of the rotating shaft 14, and the active stroke of each hydraulic jacking swivel oil cylinder 16 is equal. In the initial position, the hydraulic jacking swivel oil cylinder 16 supports the bottom formwork 10 with the leveling hydraulic cylinder 12, at this time, the jacking stroke of the hydraulic jacking swivel oil cylinder 16 is small, the jacking speed of the hydraulic jacking swivel oil cylinder 16 farthest from the rotating shaft 14 is the fastest, and it reaches the jacking limit position first, at this time, the counterfort wall has been rotated to a certain angle; At this time, the hydraulic jacking swivel oil cylinder needs to be removed and replaced with a hydraulic jacking swivel cylinder with larger stroke to enable the counterfort wall to be rotated to vertical. When the hydraulic jacking swivel oil cylinder 16 farthest from the rotating shaft 14 is jacked to the limit position and meets the requirements, it is removed, and an adjustable length support rod is hingedly connected between the jacking support point corresponding to the jacking hydraulic oil cylinder and the jacking support, and the remaining jacking hydraulic oil cylinders are cycled according to this step. While the hydraulic jacking swivel oil cylinder 16 is in action, the hydraulic pulling back swivel oil cylinder 18 also acts, which plays a role in supporting and pulling back the counterfort wall, and finally realizes the rotation of the counterfort wall to the vertical position, at this time, each adjustable length support rod also serves as a diagonal brace to support the right side of the counterfort wall, as shown in Figure 4 As shown, the side formwork of the root of the counterfort wall can be removed at this time. In actual construction, the verticality of the counterfort wall can be detected by using a theodolite.

[0046] As shown in Figure 4 The counterfort pedestal 6 is provided with a plurality of reserved holes 22, and the inclined support 16 is installed at the reserved hole 22, which is used to support the counterfort wall 1 in the vertical state and support the left side of the counterfort wall 1.

[0047] As shown in Figure 5As shown, the bottom of the counter-force wall 1 is consolidated with the rotating base 5 and the counter-force base 6, and the consolidation node is composed of three parts of anchor bolt connection, gap filling and sealing and external wrapping. The anchor bolt connection is that anchor bolts 20 are pre-buried on the rotating base 5 at the parts opposite to the counter-force wall 1 when the counter-force wall 1 rotates to the vertical state, and the counter-force wall 1 is pre-reserved with positioning holes when pouring, so that each anchor bolt 20 can be inserted into the pre-reserved positioning hole when the counter-force wall 1 rotates to the vertical position. The gap filling and sealing is that high-strength grouting material is used to seal and fill the gap between the counter-force wall 1 and the rotating base 5. The external wrapping is that the reinforcing steel bars are pre-reserved on the rotating base 5 and the counter-force base 6, and after the counter-force wall 1 is fixed in place, the pre-reserved reinforcing steel bars and the counter-force wall pre-reserved reinforcing steel bars are connected and high-flow self-compacting shrinkage-compensating concrete is poured to wrap the bottom of the counter-force wall.

[0048] The present application avoids the traditional counter-force wall vertical construction mode, and the counter-force wall is first horizontally constructed and then rotated to the vertical state. Since the flatness of the counter-force wall needs to be more accurately controlled, the counter-force wall can be controlled by the laser leveling machine during horizontal construction. Once the laser system of the laser leveling machine is initialized, as long as the laser emitter is not disturbed, no matter where the laser leveling machine moves, the ground elevation is always controlled by the plane formed by the rotating laser beam emitted by the laser emitter, thereby ensuring the flatness and levelness of the large-area and integrally-poured counter-force wall.

[0049] The above-described embodiments of the present application do not constitute a limitation on the protection scope of the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A high-precision reaction wall construction method, characterized in that, Includes the following steps: Step 1: Construct a rotating platform. The reaction wall is constructed horizontally in situ on the rotating platform. A laser leveling machine is used to control the flatness of the reaction wall surface. Step 2: After the reaction wall has been cured and its quality has been inspected and approved, the horizontally arranged reaction wall is rotated on the rotating platform to adjust it from horizontal to vertical, and the reaction wall is then positioned and fixed. Step 3: After the reaction wall is rotated into place, it is connected to the rotation platform and the reaction platform by concrete pouring, and then cured until the quality inspection is qualified.

2. The high-precision reaction wall construction method according to claim 1, characterized in that, Before pouring the reaction wall, the reaction wall formwork is erected on the rotating platform. The reaction wall formwork includes an outer formwork frame and two horizontally spaced inner formwork frames set inside the outer formwork frame. The reaction wall includes an inner side wall, a transverse diaphragm wall, and an outer side wall. Multiple loading holes are pre-embedded in the inner side wall. During construction, high-flow self-compacting shrinkage-compensating concrete is used for pouring in two stages. First, the transverse diaphragm wall and the outer side wall of the reaction wall are poured in the pouring cavity formed by the outer formwork frame and cured. Then, based on the already poured outer side wall, the inner formwork frame is erected, and the inner side wall is poured and cured in the pouring cavity formed between the outer formwork frame and the inner formwork frame, thus completing the pouring construction of the reaction wall.

3. The high-precision reaction wall construction method according to claim 2, characterized in that, The outer formwork frame includes a bottom formwork and side formwork. A horizontal support leveling system is provided on the rotating platform. The horizontal support leveling system includes multiple leveling hydraulic cylinders spaced apart along the length of the reaction wall. Support back ribs are provided between the drive end of all leveling hydraulic cylinders and the bottom formwork. Each leveling hydraulic cylinder is connected to a displacement and stress monitoring system for adjusting the levelness of the bottom formwork. The laser leveling machine is used to control the elevation of the reaction wall surface. It includes a laser emitter, a laser receiver, and a leveling rod. The laser emitter emits laser light at a set frequency to form a laser beam control plane. Then, a leveling rod is erected at the leveling control point at the designed elevation on the ground. The leveling positioning head on the rod receives the laser beam and locks the leveling positioning head. Finally, the laser receiver on the laser leveling machine is adjusted, and the working elevation of the leveling head is controlled by the computer system inside the laser leveling machine.

4. The high-precision reaction wall construction method according to claim 3, characterized in that, A rotating platform is equipped with a rotating shaft, which is fixedly connected to the outer template frame. Multiple lifting supports are spaced apart along the length of the platform on one side of the rotating shaft. Pull-back supports are located on the other side of the platform on the rotating shaft. Lifting support points are located on the bottom template corresponding to the positions of each lifting support. Hydraulic lifting and rotating cylinders are detachably hinged between the lifting support points and their corresponding lifting supports. Pull-back support points are located on the side template near the pull-back supports, corresponding to the pull-back supports. These pull-back support points are detachably hinged to their corresponding pull-back supports. There are hydraulic pull-back rotating cylinders; both the hydraulic lifting rotating cylinders and the hydraulic pull-back rotating cylinders are connected to a displacement and stress monitoring system; the reaction wall rotates around the axis of the rotating shaft. During the rotation, the hydraulic lifting rotating cylinder located furthest from the rotating shaft reaches the lifting limit position first. After reaching the limit, the hydraulic lifting rotating cylinder is removed, and an adjustable-length support rod is hinged between the lifting support point corresponding to the hydraulic lifting rotating cylinder and the lifting support. The remaining hydraulic lifting rotating cylinders cycle through this process until the reaction wall is rotated to a vertical position.

5. The high-precision reaction wall construction method according to claim 4, characterized in that, The reaction platform has multiple pre-drilled holes, and diagonal supports are installed at the pre-drilled holes to support the reaction wall in a vertical position.

6. The high-precision reaction wall construction method according to claim 4, characterized in that, The stroke of each hydraulic lifting and rotating cylinder is equal.

7. The high-precision reaction wall construction method according to any one of claims 2-6, characterized in that, The inner surface of the side formwork located at the base of the reaction wall has a patterned structure.

8. The high-precision reaction wall construction method according to any one of claims 3-5, characterized in that, The bottom of the reaction wall structure is fixed to the rotating platform and the reaction platform. The fixed joint consists of three parts: anchor bolt connection, gap filling and sealing, and external wrapping. The anchor bolt connection involves pre-embedding anchor bolts on the rotating platform at the corresponding positions when the reaction wall rotates to a vertical position. During the casting of the reaction wall, positioning holes are reserved at the corresponding positions so that each anchor bolt can be inserted into the reserved positioning holes when the reaction wall rotates to a vertical position. The gap filling and sealing involves sealing and filling the gap between the reaction wall and the rotating platform with grout. The external wrapping involves reserving steel bars on the rotating platform and the reaction platform. After the reaction wall is fixed in place, the reserved steel bars are connected to the reserved steel bars of the reaction wall, and high-flow self-compacting shrinkage-compensating concrete is poured to wrap the base of the reaction wall.

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