A reinforcement method for actively controlling deformation of foundation pits exceeding the design service life

Abstract

The present invention is a reinforcement method for actively controlling deformation of foundation pits that exceed the design service life. The method calculates the deviation of the foundation pit edge, and when the deviation exceeds the limit, reinforcement measures are taken; the position where the foundation pit has the largest deformation is first processed, and supports that can actively control deformation are arranged. The supports that can actively control deformation include reinforced horizontal supports, shaped Bailey plates, bottom constraint beams, top constraint beams, and assembled work platforms; the reinforced horizontal supports are installed; the assembled work platform is installed: the assembled work platform is arranged on the upper part of the top constraint beam, which provides support for the construction of the upper machinery on the one hand, and also serves as an active adjustment device for the position of the foundation pit on the other hand; the assembled work platform is installed on the operating machinery; the existing foundation pit concrete support is reinforced. The present invention effectively realizes the active control of the foundation pit that exceeds the design service life, and can coordinate and match the later excavation, pumping, hoisting and other devices to realize the reinforcement and emergency repair of the foundation pit that exceeds the design service life.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit reinforcement, and in particular to a reinforcement method capable of actively controlling deformation of a foundation pit exceeding its design service life. Background Art

[0002] As a temporary building structure, the design service life of foundation pit support is from foundation construction to ground elevation, and the general service life is 1-2 years. However, with the increase of uncertain factors that may be encountered during foundation pit construction, the construction progress may not meet the expected requirements, resulting in the service life of the foundation pit exceeding the limit. After the foundation pit exceeds the service life, due to changes in the surrounding environment, the deformation of the foundation pit support may exceed the allowable limit, and some foundation pits may cause water leakage, which hinders the continued construction.

[0003] How to quickly reinforce the existing foundation pit, adjust and control the existing excessive displacement, and combine the arrangements to facilitate subsequent rescue and obstacle removal is an urgent problem to be solved in the construction of this field. Summary of the invention

[0004] The present invention aims to solve the deficiencies of the prior art and to provide a reinforcement method for actively controlling deformation of a foundation pit that exceeds its design service life.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A reinforcement method for actively controlling deformation of a foundation pit exceeding its design service life, comprising the following steps:

[0007] S1. Take a corner point of the foundation pit as the coordinate origin, measure the coordinates of the four corner points, and arrange monitoring points at equal intervals along the four sides based on the coordinates of the four corner points. Compare the parameters with the original foundation pit design drawing to calculate the deviation of the foundation pit edge. ;When the deviation amount When the limit is exceeded, subsequent reinforcement measures for active deformation control are carried out;

[0008] S2. Select the three locations with the largest deformation at the corners of the foundation pit, mark them accordingly, and first process the locations with the largest deformation, arranging supports that can actively control deformation;

[0009] The actively controllable deformation support includes reinforced horizontal support, shaped Bailey plates, bottom restraint beams, top restraint beams and assembled working platforms;

[0010] S3. Install and reinforce horizontal supports:

[0011] The reinforced horizontal support includes two upper and lower positioning reinforcement components. Two shaped Bailey plates are installed between the ends of the two positioning reinforcement components. The top restraint beam is connected to the upper chords of the two shaped Bailey plates, and several bottom restraint beams are connected to the lower chords of the two shaped Bailey plates. The reinforced horizontal support and the two shaped Bailey plates are fixed with three-way mortise and tenon joints to initially maintain the stability of the foundation pit structure.

[0012] S4. Install the assembled work platform:

[0013] The assembled working platform is set on the upper part of the top restraining beam. Through the extension of the assembled working platform, the foundation pit position is actively adjusted; the top restraining beam is located between the upper flange of the shaped Bailey sheet and the assembled working platform. The extension of the assembled working platform will drive the upper flange to the lower flange of the shaped Bailey sheet to gradually generate pre-tension, in which the pre-tension gradually decreases from top to bottom, and the construction load of the assembled working platform will cause the shaped Bailey sheet to deflect downward, the upper flange to be compressed, and the lower flange to be pulled, which just offsets the pre-tension of different sizes applied before, so as to realize the active control of the foundation pit deformation and the operation process;

[0014] S5. Assembled working platform on operating machinery:

[0015] The operating machinery is arranged on the assembled working platform and starts working;

[0016] S6. Concrete support reinforcement of existing foundation pit:

[0017] S61. First, use the assembled work platform with the shaped Bailey plate to adjust the original foundation pit deformation and fix the adjusted foundation pit position;

[0018] S62, the assembled reinforcement formwork hanging under the lower I-beam of the lower chord relying on the shaped Bailey sheet is used for the reinforcement and enlargement of the original concrete support pouring operation;

[0019] S63. After the original concrete support strength reaches the requirement, move the shaped Bailey plates and assembled work platform to correct the deviation in the next area.

[0020] In step S2, the assembled work platform includes several groups of assembly beams arranged on the top constraint beam, and a sleeve is arranged between two sections of assembly beams in each group, wherein the end of the assembly beam on one side is connected with an embedded hydraulic device, and the embedded hydraulic device extends into the sleeve, and the end of the assembly beam on the other side is provided with a vertical plate, and four limit plates are arranged at the four corners of the end face of the vertical plate, and several limit holes are opened on the limit plate, and the limit plate is inserted into the sleeve and is connected and fixed to the sleeve through several limit pins after adjustment, and baffles are fixed at the ends of the four limit plates, and a push rod is arranged between the embedded hydraulic device and the baffle, and a push block is arranged at the end of the push rod, and the push block abuts against the baffle, and two-way positioning supports are arranged on both side walls of the push block, and limit springs are arranged between the two-way positioning supports, and positioning blocks are arranged at the ends of the two-way positioning supports, and two sets of positioning blocks are arranged on the inside of the sleeve, and a transmission shaft is connected to the middle part of the two-way positioning support, and a movable sleeve is connected to the end of the transmission shaft, and the movable sleeve is connected to a slide plate, and the movable sleeve and the slide plate are mounted on the push rod, and a support plate is fixed on the push rod, and a buffer energy-absorbing spring is arranged between the support plate and the slide plate.

[0021] In step S3, since there are concrete supports that have exceeded their service life in the foundation pit, the height of the newly installed reinforced horizontal supports should be staggered from the arrangement height of the original over-limit supports, and the reinforced horizontal supports should be arranged on the upper part of the original over-limit supports.

[0022] In step S3, each positioning and reinforcement assembly includes two reinforcement channel steels, and the two reinforcement channel steels are connected by a nested diagonal splicing method, specifically: the inner edge of one reinforcement channel steel is consistent in size with the outer edge of the other reinforcement channel steel, and the end of one reinforcement channel steel is inserted into the end of the other reinforcement channel steel; the reinforcement channel steel is connected to the side wall of the foundation pit by an implanted anchoring device.

[0023] In step S3, the top restraint beam is encrypted according to the position of the machinery on the later steel support.

[0024] In step S3, the upper flanges of the two shaped Bailey sheets are inserted into the two reinforcing channel steels of the upper positioning and reinforcing components, and the lower flanges are inserted into the two reinforcing channel steels of the lower positioning and reinforcing components.

[0025] In step S4, the transmission shaft is driven by the hydraulic jacking of the embedded hydraulic device, and the transmission shaft pushes the bidirectional positioning support to adjust the distance between the assembly beams on both sides. When the foundation pit edge returns to the designed position, the limit pin is used to fix the length of the assembled work platform, and then the embedded hydraulic device is closed.

[0026] In step S4, the adjustment range is not less than negative 100% To positive 200% .

[0027] In step S5, after the working machine is on the assembled working platform, the assembly beam of the assembled working platform first produces a downward deflection, and generates a bending force on the assembly beam during the moving or standing operation. The assembly beam has a downward deflection, and the bidirectional positioning support is driven to swing between the positioning blocks through the buffer energy-absorbing spring, thereby realizing the dissipation of the deformation and pulse vibration of the assembly beam.

[0028] In step S62, the assembled reinforcement formwork consists of L-shaped plates at the four corners, the upper two L-shaped plates are hung on the lower chord I-beam of the shaped Bailey plate, and the remaining connected L-shaped plates are fixed with flat plates by high-strength bolts; according to the position to be poured, the assembled reinforcement formwork is partially arranged, and the wooden formwork is placed vertically on the upper part to implement the pouring process.

[0029] The beneficial effects of the present invention are as follows: the present invention effectively realizes active control of foundation pits that exceed their design service life, and can coordinate with later excavation, pumping, hoisting and other devices to achieve reinforcement and emergency repair of foundation pits that exceed their design service life; pre-tension is gradually applied through constructed load transfer to match and offset the load effect, thereby achieving active control. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the support capable of actively controlling deformation in the present invention;

[0031] Figure 2 It is a schematic diagram of the connection of two reinforcement channel steels in the present invention;

[0032] Figure 3 It is a schematic diagram of an assembled work platform on a top restraining beam in the present invention;

[0033] Figure 4 It is a detailed schematic diagram of the assembled work platform in the present invention;

[0034] Figure 5 It is a schematic diagram of an assembled reinforcement template hung under the lower chord I-beam of the shaped Bailey sheet in the present invention;

[0035] In the figure: 1-shaped Bailey plate; 2-bottom restraint beam; 3-top restraint beam; 4-assembled working platform; 5-reinforced channel steel; 6-assembled reinforced formwork;

[0036] 41-embedded hydraulic device; 42-buffer energy-absorbing spring; 43-bidirectional positioning support; 44-transmission shaft; 45-positioning block; 46-limiting spring; 47-limiting pin; 48-assembly beam; 49-sleeve; 410-vertical plate; 411-limiting plate; 412-limiting hole; 413-baffle; 414-push rod; 415-push block; 416-positioning block; 417-moving sleeve; 418-slide plate; 419-support plate;

[0037] 61-high-strength bolt; 62-flat plate; 63-L-shaped plate;

[0038] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0040] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0043] A reinforcement method for actively controlling deformation of a foundation pit exceeding its design service life, comprising the following steps:

[0044] S1. Take a corner point of the foundation pit as the coordinate origin, measure the coordinates of the four corner points, and arrange monitoring points at equal intervals along the four sides based on the coordinates of the four corner points. Compare the parameters with the original foundation pit design drawing to calculate the deviation of the foundation pit edge. ;When the deviation amount When the limit is exceeded, subsequent reinforcement measures for active deformation control are carried out;

[0045] S2. Select the three locations with the largest deformation in the corners of the foundation pit and mark them accordingly. The locations with the largest deformation in the foundation pit should be processed first, and the support that can actively control the deformation should be arranged. The support that can actively control the deformation includes the reinforced horizontal support, the shaped Bailey sheet 1, the bottom restraint beam 2, the top restraint beam 3 and the assembled working platform 4, such as Figure 1 As shown;

[0046] S3. Install and reinforce horizontal supports:

[0047] Since there are concrete supports that have exceeded their service life in the foundation pit, the height of the newly installed reinforced horizontal supports should be staggered from the layout height of the original over-limit supports. If conditions permit, the reinforced horizontal supports should be arranged on the upper part of the original over-limit supports.

[0048] The reinforced horizontal support includes two upper and lower positioning reinforcement components, each of which includes two reinforcement channel steels 5, and the two reinforcement channel steels 5 are connected by a nested diagonal splicing method, such as Figure 2 As shown, the reinforcement channel steel 5 is connected to the side wall of the foundation pit through an implanted anchoring device to tie and fix the deformed area;

[0049] The specific form of the connection of the two reinforcing channel steels 5 is: the inner edge of one reinforcing channel steel 5 is consistent with the outer edge of the other reinforcing channel steel 5 in size, and the end of one reinforcing channel steel 5 is inserted into the end of the other reinforcing channel steel 5;

[0050] Two shaped Bailey sheets 1 are installed between the ends of the two positioning and reinforcing components, and the upper flanges of the two shaped Bailey sheets 1 are inserted into the two reinforcing channel steels 5 of the upper positioning and reinforcing components, and the lower flanges are inserted into the two reinforcing channel steels 5 of the lower positioning and reinforcing components;

[0051] The top restraint beam 3 is connected to the upper chord of the two shaped Bailey plates 1, and the top restraint beam 3 is encrypted according to the position of the machinery on the steel support in the later stage, so as to facilitate the later excavation or drainage machinery station operation;

[0052] Connecting a plurality of bottom restraining beams 2 to the lower chords of the two shaped Bailey plates 1;

[0053] Reinforce the horizontal support and two fixed Bailey pieces 1 to achieve three-way mortise and tenon fixation, and initially maintain the stability of the foundation pit structure;

[0054] S4. Installing the assembled work platform 4:

[0055] The assembled work platform 4 is arranged on the upper part of the top restraining beam 3. Figure 3 As shown, on the one hand, it provides support for the construction of the upper machinery, and on the other hand, it also serves as an active adjustment device for the foundation pit position;

[0056] Assembled work platform 4 Figure 4As shown, it includes several groups of assembly beams 48 arranged on the top restraining beam 3, and a sleeve 49 is arranged between the two sections of assembly beams 48 of each group, and the end of the assembly beam 48 on one side is connected with an embedded hydraulic device 41, and the embedded hydraulic device 41 extends into the sleeve 49, and the end of the assembly beam 48 on the other side is provided with a vertical plate 410, and four limiting plates 411 are arranged at the four corners of the end face of the vertical plate 410, and a plurality of limiting holes 412 are opened on the limiting plate 411, and the limiting plate 411 penetrates into the sleeve 49 and is connected and fixed to the sleeve 49 through a plurality of limiting pins 47 after adjustment, and a baffle 413 is fixed at the end of the four limiting plates 411, and a baffle 413 is arranged between the embedded hydraulic device 41 and the baffle 413. There is a push rod 414, a push block 415 is provided at the end of the push rod 414, the push block 415 is in contact with the baffle 413, two side walls of the push block 415 are provided with a two-way positioning support 43, a limit spring 46 is provided between the two-way positioning support 43, a positioning block 416 is provided at the end of the two-way positioning support 43, two sets of positioning blocks 45 are provided inside the sleeve 49, a transmission shaft 44 is connected to the middle of the two-way positioning support 43, a moving sleeve 417 is connected to the end of the transmission shaft 44, a slide plate 418 is connected to the moving sleeve 417, the moving sleeve 417 is connected to the slide plate 418, the moving sleeve 417 and the slide plate 418 are sleeved on the push rod 414, a support plate 419 is fixed on the push rod 414, and a buffer energy-absorbing spring 42 is provided between the support plate 419 and the slide plate 418;

[0057] The transmission shaft 44 is driven by the embedded hydraulic device 41, and the transmission shaft 44 pushes the bidirectional positioning support 43 to adjust the distance between the assembly beams 48 on both sides, and the adjustment range is not less than 100% in the negative direction. To positive 200% ; When the foundation pit edge returns to the designed position, the limit pin 47 is used to fix the length of the assembled work platform 4, and then the embedded hydraulic device 41 is closed;

[0058] The top restraining beam 3 is located between the upper flange of the shaped Bailey sheet 1 and the assembled working platform 4. The extension of the assembled working platform 4 will drive the upper flange to the lower flange of the shaped Bailey sheet 1 to gradually generate pre-tension, wherein the pre-tension gradually decreases from top to bottom, and the construction load of the assembled working platform 4 will cause the shaped Bailey sheet 1 to deflect downward, the upper flange to be compressed, and the lower flange to be pulled, which just offsets the pre-tension of different sizes applied before, thereby realizing active control of the foundation pit deformation and the working process;

[0059] S5, Assembled working platform 4 on working machinery:

[0060] After the working machine is mounted on the assembled working platform 4, the assembly beam 48 of the assembled working platform 4 first generates downward deflection, and generates a compressive bending force on the assembly beam 48 during the moving or standing operation. The assembly beam 48 will have a downward deflection deformation, and the buffer energy-absorbing spring 42 drives the bidirectional positioning support 43 to swing between the positioning block 45, thereby realizing the dissipation of the deformation and pulse vibration of the assembly beam 48;

[0061] S6. Concrete support reinforcement of existing foundation pit:

[0062] The reinforcement device that actively controls deformation can be used as a construction device during construction to continuously adjust the shape and strengthen the support of the foundation pit that has exceeded its service life. The reinforcement device that actively controls deformation can also be used as a movable reinforcement platform to reinforce the concrete support that has been deformed and cracked.

[0063] If the existing foundation pit concrete support is to be reinforced, the following steps should be followed:

[0064] S61, firstly, the assembled working platform 4 is used in conjunction with the shaped Bailey sheet 1 to adjust the original foundation pit deformation, and the adjusted foundation pit position is fixed;

[0065] S62, an assembled reinforcement formwork 6 hanging under the lower I-beam of the shaped Bailey sheet 1, used for the reinforcement and enlargement of the original concrete support pouring operation;

[0066] Prefabricated reinforcement formwork 6 Figure 5 As shown, the four corners are L-shaped plates 63, the upper two L-shaped plates 63 are hung on the lower chord I-beam of the shaped Bailey plate 1, and the remaining connected L-shaped plates 63 are fixed with flat plates 62 by high-strength bolts 61; according to the position to be poured, the assembled reinforcement formwork 6 is partially arranged, and the wooden formwork is placed vertically on the upper part to implement the pouring process.

[0067] S63, after the original concrete support strength reaches the requirement, move the shaped Bailey sheet 1 and the assembled work platform 4 to correct the deviation of the next area;

[0068] The above three-step cycle can reduce the occupancy of the assembled work platform 4 and the shaped Bailey sheet 1.

[0069] The present invention can actively adjust and fix the deformation of the foundation pit that exceeds the design service life; it innovatively proposes an assembled working platform 4, which can enable the working equipment to work and walk on the upper part, so that the platform can not only adjust the horizontal force, but also adjust the deflection deformation influence of heavier machinery during operation on the platform, especially the vibration of the machinery walking on the platform, which is dissipated by the buffer energy-absorbing spring 42.

[0070] The reinforcement device capable of actively controlling deformation proposed in the present invention can be arranged in multiple areas and directly used as a support during the construction process, or can be arranged area by area and used to reinforce existing failed concrete supports after adjusting the foundation pit position and performing corresponding mechanical operations; after the concrete supports are reinforced, they can be removed from the slots and moved to other locations for foundation pit correction and reinforcement.

[0071] The present invention simplifies the reinforcement method of foundation pits that exceed their design service life, provides a controllable active reinforcement method, can effectively connect the operation of large-scale machinery, and provides conditions for the reinforcement of concrete supports, thereby ensuring the safety of foundation pits that exceed their design service life.

[0072] The present invention gradually applies pre-tension through constructed load transfer, so that the pre-tension matches and offsets the load effect, thereby realizing active control.

[0073] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A reinforcement method for actively controlling deformation of foundation pits exceeding the design service life, characterized in that: The following steps are involved: S1. Take a corner point of the foundation pit as the coordinate origin, measure the coordinates of the four corner points, and arrange monitoring points at equal intervals along the four sides based on the coordinates of the four corner points. Compare the parameters with the original foundation pit design drawing to calculate the deviation of the foundation pit edge. ;When the deviation amount When the limit is exceeded, subsequent reinforcement measures for active deformation control are carried out; S2. Select the three locations with the largest deformation at the corners of the foundation pit, mark them accordingly, and first process the locations with the largest deformation, arranging supports that can actively control deformation; The actively controllable deformation support comprises a reinforced horizontal support, a shaped Bailey plate (1), a bottom restraint beam (2), a top restraint beam (3) and an assembled working platform (4); S3. Install and reinforce horizontal supports: The reinforced horizontal support comprises two upper and lower positioning reinforcement components, two shaped Bailey plates (1) are installed between the ends of the two positioning reinforcement components, the top restraint beam (3) is connected to the upper chords of the two shaped Bailey plates (1), and a plurality of bottom restraint beams (2) are connected to the lower chords of the two shaped Bailey plates (1); the reinforced horizontal support and the two shaped Bailey plates (1) are fixed by three-way mortise and tenon joints to initially maintain the stability of the foundation pit structure; S4. Installing the assembled work platform (4): The assembled working platform (4) is arranged on the upper part of the top restraining beam (3), and the foundation pit position is actively adjusted by extending the assembled working platform (4); the top restraining beam (3) is located between the upper flange of the shaped Bailey sheet (1) and the assembled working platform (4); the extension of the assembled working platform (4) will drive the upper flange to the lower flange of the shaped Bailey sheet (1) to gradually generate a pre-tension force, wherein the pre-tension force gradually decreases from top to bottom, and the construction load of the assembled working platform (4) will cause the shaped Bailey sheet (1) to deflect downward, the upper flange to be compressed, and the lower flange to be tensile, which just offsets the pre-tension forces of different sizes applied previously, thereby realizing active control of the foundation pit deformation and the operation process; S5. Assembled working platform on working machinery (4): The operating machinery is arranged on the assembled operating platform (4) and starts operating; S6. Concrete support reinforcement of existing foundation pit: S61, firstly, using the assembled working platform (4) in conjunction with the shaped Bailey plate (1), adjusting the original foundation pit deformation, and fixing the adjusted foundation pit position; S62, a prefabricated reinforcement formwork (6) hanging below the lower I-beam based on the shaped Bailey sheet (1), used for the reinforcement and enlargement of the original concrete support pouring operation; S63, after the original concrete support strength reaches the required level, move the shaped Bailey plate (1) and the assembled work platform (4) to correct the deviation of the next area.

2. A reinforcement method for actively controlling deformation of a foundation pit exceeding the design service life according to claim 1, characterized in that: In step S2, the assembled work platform (4) includes a plurality of groups of assembly beams (48) arranged on the top restraining beam (3), a sleeve (49) being provided between two sections of assembly beams (48) in each group, an end of the assembly beam (48) on one side being connected to an embedded hydraulic device (41), the embedded hydraulic device (41) extending into the sleeve (49), and an end of the assembly beam (48) on the other side being provided with a vertical plate (410), four limiting plates (411) being provided at four corners of the end surface of the vertical plate (410), a plurality of limiting holes (412) being provided on the limiting plates (411), the limiting plates (411) being inserted into the sleeve (49) and being connected and fixed to the sleeve (49) through a plurality of limiting pins (47) after adjustment, baffles (413) being fixed at the ends of the four limiting plates (411), the embedded hydraulic device (41) and the baffles (413) being provided between the baffles (413). A push rod (414) is provided between the two sides of the push rod (414), a push block (415) is provided at the end of the push rod (414), the push block (415) abuts against the baffle plate (413), two side walls of the push block (415) are provided with bidirectional positioning supports (43), a limit spring (46) is provided between the bidirectional positioning supports (43), a positioning block (416) is provided at the end of the bidirectional positioning supports (43), two sets of positioning blocks (45) are provided inside the sleeve (49), a transmission shaft (44) is connected to the middle of the bidirectional positioning support (43), a moving sleeve (417) is connected to the end of the transmission shaft (44), the moving sleeve (417) is connected to a slide plate (418), the moving sleeve (417) and the slide plate (418) are sleeved on the push rod (414), a support plate (419) is fixed on the push rod (414), and a buffer energy-absorbing spring (42) is provided between the support plate (419) and the slide plate (418).

3. A reinforcement method for actively controlling deformation of foundation pits exceeding the design service life according to claim 2, characterized in that: In step S3, since there are concrete supports that have exceeded their service life in the foundation pit, the height of the newly installed reinforced horizontal supports should be staggered from the arrangement height of the original over-limit supports, and the reinforced horizontal supports should be arranged on the upper part of the original over-limit supports.

4. A reinforcement method for actively controlling deformation of foundation pits exceeding the design service life according to claim 3, characterized in that: In step S3, each positioning reinforcement assembly includes two reinforcement channel steels (5), and the two reinforcement channel steels (5) are connected by a nested diagonal splicing method, specifically: the inner edge of one reinforcement channel steel (5) and the outer edge of another reinforcement channel steel (5) are of the same size, and the end of one reinforcement channel steel (5) is inserted into the end of another reinforcement channel steel (5); the reinforcement channel steel (5) is connected to the side wall of the foundation pit by an implanted anchoring device.

5. A reinforcement method for actively controlling deformation of foundation pits exceeding the design service life according to claim 4, characterized in that: In step S3, the top restraint beam (3) is encrypted according to the position of the machinery on the later steel support.

6. A reinforcement method for actively controlling deformation of foundation pits exceeding the design service life according to claim 5, characterized in that: In step S3, the upper flanges of the two shaped Bailey sheets (1) are inserted into the two reinforcing channel steels (5) of the upper positioning and reinforcing assembly, and the lower flanges are inserted into the two reinforcing channel steels (5) of the lower positioning and reinforcing assembly.

7. A reinforcement method for actively controlling deformation of a foundation pit exceeding the design service life according to claim 6, characterized in that: In step S4, the transmission shaft (44) is driven by hydraulic jacking through the embedded hydraulic device (41), and the transmission shaft (44) pushes the bidirectional positioning support (43) to adjust the distance between the assembly beams (48) on both sides. When the foundation pit edge line returns to the designed position, the limit pin shaft (47) is used to fix the length of the assembled work platform (4), and then the embedded hydraulic device (41) is closed.

8. A reinforcement method for actively controlling deformation of foundation pits exceeding the design service life according to claim 7, characterized in that: In step S4, the adjustment range is not less than negative 100% To positive 200% .

9. A reinforcement method for actively controlling deformation of a foundation pit exceeding the design service life according to claim 8, characterized in that: In step S5, after the working machine is mounted on the assembled working platform (4), the assembly beam (48) of the assembled working platform (4) first generates a downward deflection, and generates a compressive bending force on the assembly beam (48) during the moving or standing operation. The assembly beam (48) has a downward deflection deformation, and the bidirectional positioning support (43) is driven to swing between the positioning block (45) through the buffer energy-absorbing spring (42), thereby realizing the dissipation of the deformation and pulse vibration of the assembly beam (48).

10. A reinforcement method for actively controlling deformation of a foundation pit exceeding the design service life according to claim 9, characterized in that: In step S62, the assembled reinforcement formwork (6) is composed of L-shaped plates (63) at the four corners, the upper two L-shaped plates (63) are hung on the lower chord I-beam of the shaped Bailey plate (1), and the remaining connected L-shaped plates (63) are fixed with a flat plate (62) by high-strength bolts (61); according to the position to be poured, the assembled reinforcement formwork (6) is partially arranged, and a wooden formwork is vertically placed on the upper part thereof to implement the pouring process.

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