An inner support system for a foundation pit retaining structure

Abstract

The application belongs to the technical field of deep foundation pit construction and support, and discloses an inner support system for foundation pit enclosure structure, which comprises: surrounding purlins, two surrounding purlins are oppositely arranged on the opposite side walls of the foundation pit along the horizontal direction; a moving mechanism, the moving mechanism comprises a U-shaped moving frame which is slidably connected to one surrounding purlin, and the U-shaped moving frame can reciprocate along the length direction of the surrounding purlin; a rotary mounting portion, the rotary mounting portion is arranged on the upper end surface of the bottom of the U-shaped moving frame; and a support assembly, the support assembly comprises a plurality of sections of telescopic support rods which are connected in sequence, and the first section of the telescopic support rod is connected with a universal ball head mechanism at one end, and the universal ball head mechanism is fixed on the rotary mounting portion. The application greatly increases the site adaptability and overall adjustability of the inner support system, and facilitates construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of deep foundation pit construction and support technology, in particular to an inner support system for foundation pit enclosure structure. BACKGROUND

[0002] The development of urban construction has driven the development of underground space, and high-rise buildings, multi-story basements, underground parking lots, large underground commercial complexes, and subway, municipal engineering, underground substation projects have sprung up like mushrooms. The scale of urban foundation pit engineering is getting larger and deeper, and the density is also increasing. While ensuring the safe and smooth progress of foundation pit engineering construction, it is also necessary to minimize the disturbance to the surrounding soil and meet the requirements of environmental protection. In the support and support system of foundation pit engineering construction, the foundation pit enclosure structure can play a role in retaining soil and providing sufficient work space for underground engineering construction. The inner support system provides support points for the foundation pit enclosure structure, directly balances the lateral pressure on both ends of the enclosure structure, and controls the deformation and internal force of the foundation pit enclosure structure within the allowable range. Various foundation pit enclosure structures and inner support systems have been developed in foundation pit engineering, and different enclosure structures and inner support systems can be flexibly combined to form a variety of support systems. Steel support is currently the most common type of inner support system.

[0003] The connection structure between the steel support and the steel enclosing purlin of the foundation pit support disclosed in the publication No. CN218861539U includes a steel enclosing purlin and a steel support, the steel enclosing purlin has two parts respectively fixed on the opposite side walls of the deep foundation pit, and the steel support is arranged between the two steel enclosing purlins. The steel support has a length direction, and both ends of the length direction are provided with a loose joint. The loose joint includes a support mechanism and an abutting plate, the support mechanism is installed at one end of the length direction of the steel support, the abutting plate is installed at the end of the support mechanism away from the steel support, the support mechanism drives the abutting plate to slide along the length direction of the steel support, and the abutting plate is tightly abutted against the steel enclosing purlin through sliding. It has the effect of reducing the influence of the gap on the strength of the support structure. However, the steel support is generally only used in relatively shallow or regular-shaped foundation pits, and needs to be installed at a specified position. The installation and use of the steel support at the corner of the foundation pit or the position with a shape mutation are limited. Meanwhile, the hoisting of the fixed position requires a large operating space, and the continuous movement and operation of the hoisting machinery will cause a certain disturbance to the pit wall, causing certain safety hazards. SUMMARY

[0004] In view of the problems in the prior art, the present application provides an inner support system for foundation pit enclosure structure, which greatly increases the site adaptability and overall adjustability of the inner support system, and facilitates construction.

[0005] In order to solve the above technical problems, the present application is realized by the following technical scheme:

[0006] An inner support system for foundation pit enclosure structure, comprising:

[0007] Walers, two of which are horizontally aligned and installed on opposite sidewalls of the foundation pit;

[0008] The moving mechanism includes a U-shaped moving frame slidably connected to one of the walers, the U-shaped moving frame being capable of reciprocating along the length of the waler;

[0009] A rotating mounting part is disposed on the upper end face of the bottom of the U-shaped movable frame;

[0010] The support assembly includes several retractable support rods connected in sequence. One end of the first retractable support rod is connected to a universal ball joint mechanism, which is fixed to the rotating mounting part.

[0011] Furthermore, the moving mechanism also includes a T-shaped groove formed on the waler along the length direction of the waler and a T-shaped slider that slides within the T-shaped groove, the T-shaped slider being fixedly connected to the U-shaped moving frame.

[0012] Furthermore, the first roller is connected to one end of the T-shaped slider located within the T-shaped groove.

[0013] Furthermore, the moving mechanism also includes a platform fixedly connected to the bottom of the waler, a track plate is provided on the platform, a track groove is provided on the track plate along the length direction of the waler, a second roller is slidably matched in the track groove, and the second roller is installed at the bottom of the U-shaped moving frame.

[0014] Furthermore, several stiffening rods are connected between the bottom of the platform and the side wall of the pit.

[0015] Furthermore, the rotating mounting part includes a rotating platform fixed to the upper surface of the bottom of the U-shaped movable frame and a U-shaped block fixed to the upper surface of the rotating platform, and the universal ball joint mechanism is fixed in the U-shaped groove on the U-shaped block.

[0016] Furthermore, the universal ball joint mechanism includes a ball joint fixing seat, a ball joint matched and connected to the ball joint fixing seat, and a connecting rod connected to the ball joint, wherein the connecting rod is fixed in the U-shaped groove on the U-shaped block.

[0017] Furthermore, the telescopic support rod includes a main rod and a secondary rod telescopically connected to both ends of the main rod. A load-bearing plate is fixed inside the main rod, and a telescopic drive device is provided between the load-bearing plate and the secondary rod. One end of the telescopic drive device is connected to the secondary rod, and the other end is connected to the load-bearing plate.

[0018] Furthermore, adjacent sections of the telescopic support rod are connected by a flange.

[0019] Further, one end of the telescopic support rod is provided with a ranging laser emitter, and the other end is provided with a ranging laser receiver.

[0020] Compared with the prior art, the present application has at least the following beneficial effects:

[0021] The inner support system for the foundation pit retaining structure provided by the present application comprises a surrounding purlin installed on the opposite side walls of the foundation pit, a U-shaped moving frame installed on the surrounding purlin on one side wall of the foundation pit, the U-shaped moving frame being capable of reciprocating along the length direction of the surrounding purlin, a rotary mounting portion installed in the U-shaped moving frame, the rotary mounting portion being capable of reciprocating rotation, a universal ball head mechanism connected to one end of the telescopic support rod, and installed on the rotary mounting portion. According to the actual support requirement in the construction process, the telescopic support rod can be transported to the specified position by controlling the U-shaped moving frame to move to the position requiring support, and finally the telescopic support rod is extended and abutted on the surrounding purlin installed on the other side wall of the foundation pit. It can be seen that the present application does not need to repeatedly move hoisting instruments in a narrow construction site, reduces the disturbance of hoisting machinery to the foundation pit wall, and saves a large amount of construction cost. In addition, according to the actual support requirement in the construction process, the rotary mounting portion can also be controlled to rotate, and when the rotary mounting portion rotates, the telescopic support rod is swung by a certain angle through the universal ball head mechanism. The universal ball head mechanism hinge technology greatly increases the site adaptability and overall adjustability of the inner support system, facilitates construction, and can realize the support of the corner of the foundation pit or the position where the shape changes suddenly.

[0022] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creating any inventive labor.

[0024] Figure 1 It is a perspective view of the inner support system for the foundation pit retaining structure according to the embodiment of the present application.

[0025] Figure 2 It is a front view of the inner support system for the foundation pit retaining structure according to the embodiment of the present application.

[0026] Figure 3 It is a schematic view of the moving mechanism of the inner support system for the foundation pit retaining structure according to the embodiment of the present application.

[0027] Figure 4 For Figure 2 Detail view of A part in the middle;

[0028] Figure 5 For a support assembly schematic diagram of an inner support system for a foundation pit retaining structure according to an embodiment of the present application;

[0029] Figure 6 For a universal ball head mechanism schematic diagram of an inner support system for a foundation pit retaining structure according to an embodiment of the present application;

[0030] Figure 7 For a telescopic support rod schematic diagram of an inner support system for a foundation pit retaining structure according to an embodiment of the present application.

[0031] In the figure: 1-enclosure purlin; 2-moving mechanism; 20-U-shaped moving frame; 200-window; 21-T-shaped sliding groove; 22-T-shaped sliding block; 23-first roller; 24-platform; 25-track plate; 26-track groove; 27-second roller; 3-rotary mounting part; 30-rotary table; 31-U-shaped block; 310-first through hole; 4-support assembly; 40-telescopic support rod; 400-main rod; 401-secondary rod; 402-bearing plate; 403-telescopic driving device; 41-universal ball head mechanism; 410-ball head fixing seat; 411-ball head; 412-connecting rod; 4120-second through hole; 5-stiffening rod; 6-flange plate; 7-distance measuring laser emitter; 8-distance measuring laser receiver; 9-axle force meter. DETAILED DESCRIPTION

[0032] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] According to an inner support system for a foundation pit retaining structure according to an embodiment of the present application, as Figure 1 and Figure 2As shown, the inner support system comprises surrounding purlin 1, moving mechanism 2, rotary mounting part 3 and support assembly 4, wherein two surrounding purlins 1 are oppositely arranged on the opposite side walls of the foundation pit in the horizontal direction; the moving mechanism 2 comprises a U-shaped moving frame 20 slidably connected to one surrounding purlin 1, the U-shaped moving frame 20 can reciprocate along the length direction of the surrounding purlin 1; the rotary mounting part 3 is arranged on the upper end face of the bottom of the U-shaped moving frame 20, and the rotary mounting part 3 can rotate in the plane; the support assembly 4 comprises a plurality of sections of telescopic support rods 40 connected in sequence, one end of the first section of telescopic support rod 40 is connected with a universal ball head mechanism 41, the universal ball head mechanism 41 is fixed on the rotary mounting part 3, and the rotary mounting part 3 can drive the telescopic support rod 40 to swing left and right in the horizontal plane through the universal ball head mechanism 41.

[0034] According to the inner support system of the embodiment of the present application, when in use, the surrounding purlins 1 are respectively arranged on the opposite side walls of the foundation pit, the U-shaped moving frame 20 is arranged on the surrounding purlin 1 arranged on one side wall of the foundation pit, the rotary mounting part 3 is arranged in the U-shaped moving frame 20, and the universal ball head mechanism 41 connected with one end of the telescopic support rod 40 is arranged on the rotary mounting part 3. According to the actual support requirement in the construction process, the U-shaped moving frame 20 is moved to the position requiring support, and the telescopic support rod 40 is extended and abuts against the surrounding purlin 1 arranged on the other side wall of the foundation pit. Meanwhile, according to the actual support requirement in the construction process, the rotary mounting part 3 can also be controlled to rotate, and when the rotary mounting part 3 rotates, the telescopic support rod 40 is swung through the universal ball head mechanism 41 by a certain angle, so that the support for the corner of the foundation pit or the position with shape mutation can be realized.

[0035] In some embodiments, as shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , the moving mechanism 2 of the inner support system further comprises a T-shaped sliding groove 21 opened on the surrounding purlin 1 along the length direction of the surrounding purlin 1 and a T-shaped sliding block 22 slidably matched in the T-shaped sliding groove 21, and the T-shaped sliding block 22 is fixedly connected with the U-shaped moving frame 20. Specifically, one T-shaped sliding groove 21 is opened on the surrounding purlin 1 near the top and the bottom, respectively, and four T-shaped sliding blocks 22 are welded on the U-shaped moving frame 20 near the four corners of the side close to the surrounding purlin 1, the two T-shaped sliding blocks 22 near the top of the U-shaped moving frame 20 are slidably connected with the T-shaped sliding groove 21 near the top of the surrounding purlin 1, and the two T-shaped sliding blocks 22 near the bottom of the U-shaped moving frame 20 are slidably connected with the T-shaped sliding groove 21 near the bottom of the surrounding purlin 1.

[0036] It should be understood that the T-shaped sliding groove 21 on the surrounding purlin 1 is pre-opened in the factory, and the T-shaped sliding block 22 on the U-shaped moving frame 20 is also pre-welded in the factory. For example, the surrounding purlin 1 is an I-shaped steel, and the size of the T-shaped sliding groove 21 reserved on the surrounding purlin 1 is slightly larger than that of the T-shaped sliding block 22.

[0037] In this embodiment, the reciprocating sliding connection between the U-shaped moving frame 20 and the surrounding purlin 1 is achieved by the sliding fit of the T-shaped sliding block and the T-shaped sliding groove. The structural connection is reliable and convenient to install and disassemble.

[0038] On the basis of the above-mentioned embodiments, as more preferred embodiments, in combination with Figure 4 As shown, the first roller 23 is connected to one end of the T-shaped sliding block 22 located in the T-shaped sliding groove 21. Specifically, by providing the first roller 23, the U-shaped moving frame 20 can move more smoothly and stably during reciprocating movement.

[0039] On the basis of the above-mentioned embodiments, as more preferred embodiments, in combination with Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the moving mechanism 2 of the inner support system further includes a platform 24 fixedly connected to the bottom of the surrounding purlin 1. For example, the surrounding purlin 1 is a steel surrounding purlin, and the platform 24 is fixed to the bottom of the surrounding purlin 1 by welding. An orbit plate 25 is provided on the platform 24. Orbit grooves 26 are formed on the orbit plate 25 along the length direction of the surrounding purlin 1. For example, the orbit plate 25 is fixed to the platform 24 by a bolt assembly, or the orbit plate 25 is fixed to the platform 24 by welding, or other fixed ways can be realized, which are not limited here. Orbit grooves 26 are formed on the orbit plate 25 near the two sides along the length direction of the surrounding purlin 1. Second rollers 27 are slidingly matched in the orbit grooves 26. The second rollers 27 are installed at the bottom of the U-shaped moving frame 20. For example, one second roller 27 is installed at each of the four corners of the bottom of the U-shaped moving frame 20. The size of the orbit groove 26 is slightly larger than that of the second roller 27.

[0040] Specifically, by providing the platform 24 at the bottom of the surrounding purlin 1, and then providing the orbit groove 26 on the platform 24 which can cooperate with the second roller 27 at the bottom of the U-shaped moving frame 20, the stability of the U-shaped moving frame 20 during movement can be better ensured.

[0041] Preferably, as shown in Figure 1 、 Figure 2 and Figure 3 A plurality of stiffening bars 5 are connected between the bottom of the platform 24 and the side wall of the foundation pit. The stiffening bars 5 play a role of reinforcing and supporting the platform 24, improving the overall stability and reliability of the moving mechanism 2.

[0042] In some embodiments, in combination with Figure 1 and Figure 3As shown, the rotating mounting part 3 of the inner support system comprises a rotating table 30 fixed on the upper end face of the bottom of the U-shaped moving frame 20 and a U-shaped block 31 fixed on the upper end of the rotating table 30, and the universal ball head mechanism 41 is fixed in the U-shaped groove on the U-shaped block 31. That is, the rotation of the rotating table 30 drives the U-shaped block 31 to rotate, and in turn drives the universal ball head mechanism 41 on the U-shaped block 31 to rotate.

[0043] It should be noted that the rotating table 30 can rotate clockwise or counterclockwise, and the rotating table 30 does not need to rotate 360°, but only needs to realize reciprocating rotation function in a small angle range, for example, 20°-30° counterclockwise or clockwise. It should also be understood here that the size of the rotation angle is not limited, and can be reasonably designed according to the actual construction requirements.

[0044] In some embodiments, in combination with Figure 6 As shown, the universal ball head mechanism 41 comprises a ball head fixing seat 410, a ball head 411 connected to the ball head fixing seat 410, and a connecting rod 412 connected to the ball head 411, and the connecting rod 412 is fixed in the U-shaped groove on the U-shaped block 31. The matching connection structure of the ball head 411 and the ball head fixing seat 410 can well realize the angle change of the telescopic support rod 40.

[0045] For example, the connecting rod 412 and the U-shaped block 31 are detachably connected through a plug-in rod. Specifically, in combination with Figure 1 、 Figure 2 and Figure 3 As shown, the U-shaped moving frame 20 is provided with windows 200 on the opposite sides, the U-shaped block 31 is provided with first through holes 310 on the opposite sides, the first through holes 310 are opposite to the windows 200, the connecting rod 412 is provided with a second through hole 4120, the axis of the second through hole 4120 is on the same line as the first through hole 310, one end of the plug-in rod is inserted from the window 200 on one side of the U-shaped moving frame 20, and then passes through the first through hole 310 on one side of the U-shaped block 31, the second through hole 4120 on the connecting rod 412 and the first through hole 310 on the other side of the U-shaped block 31 in turn, and then is taken out from the window 200 on the other side of the U-shaped moving frame 20. The connecting rod 412 and the U-shaped block 31 are connected through the plug-in rod, which is convenient and fast to install, and is convenient to disassemble and replace.

[0046] Preferably, an axial force meter 9 is arranged at the bottom of the ball head fixing seat 410, and the support pressure of the inner support system can be measured by the axial force meter 9.

[0047] In some embodiments, in combination with Figure 1 and Figure 7As shown, the telescopic support rod 40 of the inner support system comprises a main rod 400 and a secondary rod 401 connected to both ends of the main rod 400, a load-bearing plate 402 is fixed in the main rod 400, a telescopic driving device 403 is arranged between the load-bearing plate 402 and the secondary rod 401, one end of the telescopic driving device 403 is connected with the secondary rod 401, and the other end is connected with the load-bearing plate 402. As an example, the load-bearing plate 402 is installed at the middle position of the main rod 400 in an interference fit manner, and the telescopic driving device 403 is a jack. Figure 6 As shown, the jack is connected with an oil pipe and a cable, the oil pipe is connected with an oil source, and the cable is connected with a control system. The telescopic driving device 403 is controlled through the control system to control the telescopic driving device 403, and then the telescopic support rod 40 at both ends of the telescopic support rod 40 is controlled.

[0048] On the basis of the above embodiment, as a more preferred embodiment, in combination with Figure 5 As shown, two adjacent telescopic support rods 40 are connected through flanges 6. Specifically, a flange 6 is welded and fixed at both ends of the telescopic support rod 40, and the flanges 6 on the adjacent telescopic support rods 40 are fixed and connected through bolts and nuts, which is reliable and firm, and convenient for disassembly and installation, and can quickly realize the assembly of the telescopic support rods 40.

[0049] In some embodiments, as shown in Figure 1 and Figure 2 As shown, one end of the telescopic support rod 40 is provided with a distance measuring laser emitter 7, and the other end is provided with a distance measuring laser receiver 8. Through the distance measuring laser emitter 7 and the distance measuring laser receiver 8, the total length of the telescopic support rod 40 can be accurately calculated, which is convenient for construction.

[0050] The inner support system for foundation pit support structure in use is as follows:

[0051] Step one: install the surrounding purlin and the platform

[0052] The surrounding purlin 1 is installed on the side wall or the corbel of the foundation pit, and the T-shaped sliding groove 21 is arranged on the surrounding purlin 1. The platform 24 is installed at the bottom of the surrounding purlin 1, and the stiffener 5 is installed obliquely between the platform 24 and the pit wall. The track plate 25 is installed on the platform 24, and the track groove 26 is arranged on the track plate 25.

[0053] Step two: install the U-shaped moving frame

[0054] The U-shaped moving frame 20 is connected with the T-shaped sliding groove 21 on the surrounding purlin 1 through the T-shaped sliding block 22. The rotating table 30 and the U-shaped block 31 are installed in the U-shaped moving frame 20 from bottom to top, and the second roller 27 is installed at the bottom of the U-shaped moving frame 20. The installed second roller 27 is slidably matched on the track groove 26.

[0055] Step three: erecting the first telescopic support rod

[0056] The insertion rod is inserted through the first through hole 310 and the second through hole 4120, the connecting rod 412 is connected and fixed with the U-shaped block 31, the length of the first telescopic support rod 40 is measured through the distance measuring laser emitter 7 and the distance measuring laser receiver 8, and the length of the first telescopic support rod 40 is adjusted by controlling the jack through the oil pipe and cable connected control system. The position of the first telescopic support rod 40 can be adjusted through the U-shaped moving frame 20, after the U-shaped moving frame 20 is moved to the predetermined position, the ball head fixing seat 410 is fixed on the surrounding purlin 1 through the reserved hole on the ball head fixing seat 410, and the horizontal angle of the first telescopic support rod 40 is adjusted by rotating the rotating table 30 according to the engineering requirement.

[0057] Step four: splicing the telescopic support rod

[0058] After the first telescopic support rod 40 is erected, the first telescopic support rod 40 is connected with the second telescopic support rod 40 through the flange plate 6 and the bolt cooperation, the length of the second telescopic support rod 40 is adjusted by controlling the jack through the oil pipe and cable, and a plurality of telescopic support rods 40 can be assembled in sequence until the engineering requirement is met.

[0059] The application can also greatly improve the construction efficiency and reduce the construction cost, and has important significance for engineering construction.

[0060] Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, but not to limit them, the protection scope of the present application is not limited to this, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art within the technical range disclosed by the present application can modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and all should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An internal support system for foundation pit retaining structure, characterized in that, include: Waler (1), two walers (1) are set opposite each other in the horizontal direction on the opposite sidewalls of the foundation pit; The moving mechanism (2) includes a U-shaped moving frame (20) slidably connected to a waler (1), the U-shaped moving frame (20) being capable of reciprocating along the length of the waler (1); The moving mechanism (2) further includes a T-shaped groove (21) opened on the waler (1) along the length direction of the waler (1) and a T-shaped slider (22) slidably matched in the T-shaped groove (21). The T-shaped slider (22) is fixedly connected to the U-shaped moving frame (20). One end of the T-shaped slider (22) located in the T-shaped groove (21) is connected to a first roller (23). The moving mechanism (2) further includes a platform (24) fixedly connected to the bottom of the waler (1). A track plate (25) is provided on the platform (24). A track groove (26) is provided on the track plate (25) along the length direction of the waler (1). A second roller (27) is slidably matched in the track groove (26). The second roller (27) is installed at the bottom of the U-shaped moving frame (20). Rotary mounting part (3), the rotary mounting part (3) includes a rotating table (30) fixed to the upper surface of the bottom of the U-shaped moving frame (20) and a U-shaped block (31) fixed to the upper end of the rotating table (30), the universal ball joint mechanism (41) is fixed in the U-shaped groove on the U-shaped block (31); The support assembly (4) includes several retractable support rods (40) connected in sequence. One end of the first retractable support rod (40) is connected to a universal ball joint mechanism (41), which is fixed on the rotating mounting part (3).

2. The internal support system for foundation pit retaining structure according to claim 1, characterized in that, Several stiffening rods (5) are connected between the bottom of the platform (24) and the side wall of the pit.

3. The internal support system for foundation pit retaining structure according to claim 1, characterized in that, The universal ball joint mechanism (41) includes a ball joint fixing seat (410), a ball joint (411) matched and connected to the ball joint fixing seat (410), and a connecting rod (412) connected to the ball joint (411). The connecting rod (412) is fixed in the U-shaped groove on the U-shaped block (31).

4. The internal support system for foundation pit retaining structure according to claim 1, characterized in that, The telescopic support rod (40) includes a main rod (400) and a secondary rod (401) telescopically connected to both ends of the main rod (400). A load-bearing plate (402) is fixed inside the main rod (400). A telescopic drive device (403) is provided between the load-bearing plate (402) and the secondary rod (401). One end of the telescopic drive device (403) is connected to the secondary rod (401), and the other end is connected to the load-bearing plate (402).

5. The internal support system for foundation pit retaining structure according to claim 1, characterized in that, The two adjacent telescopic support rods (40) are connected by a flange (6).

6. The internal support system for foundation pit retaining structure according to claim 1, characterized in that, One end of the retractable support rod (40) is equipped with a ranging laser transmitter (7), and the other end is equipped with a ranging laser receiver (8).

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