Adjustable force transmission structure for fabricated side wall and enclosure of foundation pit

Abstract

The invention relates to the technical field of deep foundation pit supporting and fabricated underground structure construction, and discloses a foundation pit fabricated side wall and enclosure adjustable force transmission structure which comprises a lower section structure composed of a bottom sealing plate and a lower section sleeve and an upper section structure composed of an upper section sleeve, a limiting lead screw and a rotating handle. By means of the adjustable mechanical design, the defects of traditional concrete backfilling are overcome, wide-range stepless adjustment is achieved through the spiral transmission mechanism, the fertilizer groove width deviation is perfectly adapted, field cutting or filling is not needed, the middle plate can be synchronously installed along with the side wall as a prefabricated part, and rapid jacking can be achieved by rotating a wrench after the middle plate is completed; the concrete pouring and curing waiting time is thoroughly saved, and the construction efficiency is greatly improved; meanwhile, the rigid mechanical force transmission path ensures high bearing capacity and reliability, the test is free of damage and deformation, the whole device is simple in structure and is operated only by a common wrench, and the construction difficulty and cost are reduced.

Description

Technical Field

[0001] This invention relates to the technical field of deep foundation pit support and prefabricated underground structure construction, and particularly to an adjustable force transmission structure for prefabricated sidewalls and enclosures of foundation pits. Background Technology

[0002] In deep foundation pit engineering, especially in projects such as subway stations and large underground spaces constructed using the cut-and-cover method or the top-and-bottom method, the conversion of the support system is a crucial step in ensuring the stability of the foundation pit and the safety of the structure. The second steel support, whose design location is usually roughly the same height as the permanent structural slab, plays a vital role in balancing the lateral earth pressure on the foundation pit during the construction of the main structure. To achieve a smooth stress transfer from the temporary steel support to the permanent structure, the gap between the completed slab structure and the foundation pit retaining structure (such as diaphragm walls, piles, etc.) must be effectively filled and tightened before removing the steel support. This measure aims to directly and reliably transfer the inward-converging lateral pressure of the foundation pit to the slab, where it is borne by the permanent structural system, thereby ensuring the overall stability and controlled deformation of the foundation pit after the support is removed. However, due to unavoidable verticality deviations, planar position deviations, and the accumulation of construction errors during the construction of the enclosure structure, the width of the groove formed between the prefabricated sidewall and the enclosure structure is not uniform after installation. There are often local widths that are greater than or less than the design reserved value (such as 50cm), which brings great challenges to the traditional filling and tightening construction.

[0003] Traditionally, this area has been backfilled with concrete, but this method has its drawbacks. The construction process is cumbersome, requiring backfilling of a 12m deep trench for every 2m of sidewall assembly. The construction organization is complex, and assembly can only continue after the concrete reaches the design strength, which severely restricts the advantages of efficient construction of prefabricated structures. The backfill thickness cannot be flexibly adjusted, has poor adaptability, and is prone to problems such as insufficient compaction and uneven stress. Summary of the Invention

[0004] In view of the problems existing in the adjustable force transmission structure of the prefabricated sidewalls and enclosures of the foundation pit, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide an adjustable force transmission structure for prefabricated sidewalls and enclosures of foundation pits. The purpose is to achieve a fast and tight force transmission through an adjustable passive force transmission key device between the prefabricated sidewalls and enclosures, which can replace traditional concrete backfilling.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a lower section structure consisting of a bottom sealing plate and a lower sleeve, and an upper section structure consisting of an upper sleeve, a limiting screw, and a rotating handle.

[0007] As a preferred embodiment of the adjustable force transmission structure of the prefabricated sidewall and enclosure of the foundation pit described in this invention, the lower sleeve is fixedly installed on the outside of the bottom sealing plate, and the rotating handle is located on the outer periphery of the upper sleeve.

[0008] As a preferred embodiment of the adjustable force transmission structure of the prefabricated sidewall and enclosure of the foundation pit described in this invention, wherein: the limiting screw is fixed relative to the upper sleeve, and the end of the limiting screw is threadedly engaged with the lower sleeve.

[0009] As a preferred embodiment of the adjustable force transmission structure of the prefabricated sidewall and enclosure of the foundation pit described in this invention, a steel plate is connected to the outer side of the bottom sealing plate, and the steel plate is used to connect with the sidewall.

[0010] As a preferred embodiment of the adjustable force transmission structure of the prefabricated sidewall and enclosure of the foundation pit described in this invention, a steel waler is provided on one side of the upper sleeve, and the steel waler is used to abut against the enclosure structure of the foundation pit.

[0011] As a preferred embodiment of the adjustable force transmission structure of the prefabricated sidewall and enclosure of the foundation pit described in this invention, the lower sleeve and the upper sleeve achieve relative axial extension and retraction through the screwing in or out of the limiting screw, thereby adjusting the force transmission distance between the bottom sealing plate and the steel waler.

[0012] As a preferred embodiment of the adjustable force transmission structure of the prefabricated sidewall and enclosure of the foundation pit described in this invention, the rotating handle is used to drive the upper sleeve and the limiting screw fixed thereto to rotate synchronously to achieve telescopic adjustment.

[0013] As a preferred embodiment of the adjustable force transmission structure of the prefabricated sidewall and enclosure of the foundation pit described in this invention, the steel waler abuts against the foundation pit enclosure structure, and the sidewall transmits the lateral load to the adjustable force transmission structure through the steel plate and the bottom sealing plate.

[0014] As a preferred embodiment of the adjustable force transmission structure of the prefabricated sidewall and enclosure of the foundation pit described in this invention, wherein: the limiting screw and the lower sleeve are threaded together to form a helical pair, converting the rotational motion input by the rotating handle into linear motion between the upper and lower structures.

[0015] As a preferred embodiment of the adjustable force transmission structure of the prefabricated sidewall and enclosure of the foundation pit described in this invention, the rotating handle and the limiting screw are rotated to adjust the overall length, so that the sidewall and enclosure structure are tightly fitted together.

[0016] The beneficial effects of this invention are as follows: Through its adjustable mechanical design, it solves the drawbacks of traditional concrete backfilling. Its screw drive mechanism achieves wide-range stepless adjustment, perfectly adapting to the width deviation of the backfill trench. No on-site cutting or filling is required. As a precast component, it can be installed synchronously with the side walls. After the middle plate is completed, simply rotate a wrench to quickly tighten it, completely eliminating the waiting time for concrete pouring and curing, and greatly improving construction efficiency. At the same time, its rigid mechanical force transmission path ensures high load-bearing capacity and reliability. No damage or deformation was observed during testing. The entire device has a simple structure and can be operated with just a regular wrench, reducing construction difficulty and cost. It comprehensively overcomes the shortcomings of traditional processes in terms of efficiency, adaptability, and reliability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a longitudinal cross-sectional view of the limit screw structure of the present invention after elongation.

[0019] Figure 3 This is a schematic diagram of the limiting lead screw structure of the present invention from another perspective.

[0020] Figure 4 This is a schematic diagram of the limiting lead screw structure of the present invention.

[0021] Figure 5 This is a cross-sectional view of the upper sleeve structure of the present invention.

[0022] Figure 6 This is a diagram showing the installation position arrangement of the limiting screw structure of the present invention.

[0023] Figure 7 This is a cross-sectional view of the installation position of the limiting screw structure of the present invention.

[0024] In the diagram: 1. Bottom sealing plate; 2. Lower sleeve; 3. Upper sleeve; 4. Limiting screw; 5. Rotating handle; 6. Steel plate; 7. Steel waler; 8. Side wall. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0029] Example 1 Reference Figures 1-7 The first embodiment of the present invention provides an adjustable force transmission structure for prefabricated sidewalls and enclosures of foundation pits. This device includes a lower section structure consisting of a bottom sealing plate 1 and a lower sleeve 2, and an upper section structure consisting of an upper sleeve 3, a limiting screw 4, and a rotating handle 5.

[0030] The device is clearly divided into a lower section consisting of a bottom sealing plate 1 and a lower sleeve 2, and an upper section consisting of an upper sleeve 3, a limiting screw 4, and a rotating handle 5, forming a modular physical entity with clear functional divisions. The lower section serves as the fixed end, providing a stable installation base for the entire device through the bottom sealing plate 1, while the upper section serves as the movable end, integrating the core components for adjustment and force transmission. This fundamentally eliminates the traditional wet operation mode of concrete backfilling, materializing the force transmission function into an independent mechanical unit that can be prefabricated in the factory and quickly assembled on-site. This not only provides structural possibilities for subsequent stepless length adjustment but also enables the device to be hoisted into place synchronously with the prefabricated side wall 8, just like a standard component, achieving perfect integration with the main prefabricated construction process.

[0031] Specifically, the lower sleeve 2 is fixedly installed on the outside of the bottom sealing plate 1, and the rotating handle 5 is located on the outer periphery of the upper sleeve 3.

[0032] The lower sleeve 2 is fixedly installed on the outside of the bottom sealing plate 1. This arrangement makes the lower structure a rigid whole, ensuring that the load from the side wall 8 can be transmitted vertically to the axial center of the lower sleeve 2 without loss through the bottom sealing plate 1. At the same time, the rotating handle 5 is set on the outer periphery of the upper sleeve 3. This external handle design, which is integrated with the upper sleeve 3, provides construction personnel with a direct, labor-saving and sufficient torque application point. The operator does not need to use complicated tools. He can directly drive the entire upper structure to rotate by manually rotating the rotating handle 5. This conveniently converts human power into the mechanical energy required for the adjustment mechanism, greatly simplifies the on-site operation steps, and reduces the construction difficulty and technical threshold.

[0033] Furthermore, the lower sleeve 2 is fixedly installed on the outside of the bottom sealing plate 1, and the rotating handle 5 is located on the outer periphery of the upper sleeve 3.

[0034] In this system, the limiting screw 4 is fixed relative to the upper sleeve 3, and the end of the limiting screw 4 is designed to be threadedly engaged with the lower sleeve 2. When the upper structure is driven to rotate by rotating the handle 5, the rotational motion is converted into axial linear motion of the upper structure relative to the lower structure due to the threaded engagement of the limiting screw 4 and the lower sleeve 2. This makes the length adjustment process of the device smooth, accurate, and has good self-locking performance. The adjusted length state can be reliably maintained by the self-locking characteristics of the threaded pair, ensuring that the adjusted position will not accidentally loosen or retract when subjected to huge lateral loads, thereby ensuring the continuity and stability of force transmission.

[0035] Furthermore, the limiting screw 4 is fixed relative to the upper sleeve 3, and the end of the limiting screw 4 is threadedly engaged with the lower sleeve 2.

[0036] in, Furthermore, a steel plate 6 is connected to the outer side of the bottom sealing plate 1, and the steel plate 6 is used to connect with the side wall 8.

[0037] Among them, steel plate 6 is a key connecting and conversion component. One side of it is reliably connected to bottom sealing plate 1, while the other side can be rigidly connected to the pre-embedded parts of side wall 8 through pre-embedded sleeves, welded connectors or high-strength bolts. This realizes the separate design of force transmission device and prefabricated component. Both can be produced separately in the factory in a standardized manner and quickly assembled on site, which improves the flexibility of production and construction. Steel plate 6 provides a sufficiently large connection area and rigidity, which can effectively collect and transfer the distributed load borne by side wall 8 to bottom sealing plate 1, avoid stress concentration, and ensure the smoothness and integrity of load transfer path.

[0038] Furthermore, a steel waler 7 is provided on one side of the upper sleeve 3, which is used to abut against the retaining structure of the foundation pit.

[0039] Among them, the steel waler 7 diffuses the concentrated load transmitted from the upper sleeve 3 to the surface of the foundation pit retaining structure through its large contact area, reducing the contact compressive stress and avoiding local pressure damage to the concrete of the retaining structure. The steel waler 7 provides a flat and solid contact surface. Even if there are some unevenness on the surface of the retaining structure, it can achieve uniform and dense clamping through the steel component, ensuring the reliability of the contact. This design makes the force endpoint of the device clear. The entire force transmission path is from the side wall 8 through the steel plate 6, the bottom sealing plate 1, the lower structure, the threaded pair, the upper structure, and finally reaches the retaining structure through the steel waler 7, forming a clear and closed force flow channel.

[0040] Furthermore, the lower sleeve 2 and the upper sleeve 3 achieve relative axial extension and retraction through the screwing in or out of the limiting screw 4, thereby adjusting the force transmission distance between the bottom sealing plate 1 and the steel waler 7.

[0041] The lower sleeve 2 and the upper sleeve 3 achieve relative axial extension and contraction through the screwing in or out of the limiting screw 4, thereby directly adjusting the effective force transmission distance between the bottom sealing plate 1 and the steel waler 7. This allows the device to actively adapt to the changes in the width of the trench caused by the construction deviation of the retaining structure, which are common on the construction site. Regardless of whether the actual gap is greater or less than the design value, the construction personnel can extend or shorten the device to match the actual width through a simple rotation operation, thereby achieving a tight fit between the side wall 8 and the retaining structure.

[0042] Furthermore, rotating the handle 5 drives the upper sleeve 3 and the limiting screw 4 fixed thereto to rotate synchronously, so as to achieve telescopic adjustment.

[0043] The torque applied by the operator to the rotating handle 5 is directly and losslessly converted into the rotational motion of the limiting screw 4. Since the upper sleeve 3 is fixed to the limiting screw 4, the rotation of the rotating handle 5 directly drives the entire upper structure to rotate together. This design avoids complex transmission links, making the adjustment response direct. The operator can intuitively perceive the change in tightening force by hand. At the same time, the symmetrically welded handle provides a balanced force application point, making operation labor-saving and easy to control the adjustment accuracy. It is suitable for the rapid operation requirements under limited space and conditions on the construction site, and realizes convenient adjustment.

[0044] Preferably, the steel waler 7 abuts against the foundation pit retaining structure, and the side wall 8 transmits the lateral load to the adjustable force transmission structure through the steel plate 6 and the bottom sealing plate 1. The limit screw 4 and the lower sleeve 2 form a helical pair through threaded engagement, which converts the rotational motion input by the rotating handle 5 into linear motion between the upper and lower structures.

[0045] Among them, the steel waler 7 abuts against the foundation pit retaining structure, and the side wall 8 transfers the lateral load to the adjustable force transmission structure through the steel plate 6 and the bottom sealing plate 1. When the foundation pit undergoes inward convergence deformation, the load originally borne by the steel support is transferred to the assembled middle plate and its connected side wall 8. The side wall 8 transfers the load to the force transmission device through a reliable mechanical connection, and through its length which has been adjusted to the top tight state, the pressure is transferred to the retaining structure without loss. Finally, the retaining structure and the deeper support system bear the load, so that after the next steel support is removed, the foundation pit convergence force can be transferred safely and smoothly, ensuring the stability and safety of the foundation pit during the construction phase transition process.

[0046] It should be noted that rotating the handle 5 and the limiting screw 4 adjusts the overall length, so that the side wall 8 is tightly pressed against the enclosure structure; The overall length is adjusted by rotating the handle 5 and the limiting screw 4, so that the side wall 8 is tightly fitted to the enclosure structure. After the main structure is assembled, the construction personnel can quickly and finally adjust and lock the length on site according to the measured gap, which achieves rapid tightening. The tight fit directly meets the prerequisite for removing the next steel support, thus giving full play to the efficient and continuous characteristics of prefabricated construction, without being interrupted by the traditional backfilling and curing cycle.

[0047] In use, it is first reliably connected to the prefabricated side wall 8 via the connecting steel plate 6, and then hoisted to the designed position along with the side wall 8. After the middle plate of this section of the foundation pit is constructed, the construction personnel use a regular wrench to rotate the external rotating handle 5 of the device according to the actual gap between the retaining structure and the side wall 8 measured on site. This operation drives the upper sleeve 3 and the limiting screw 4 fixed to it to rotate together. Using the helical pair formed by the limiting screw 4 and the lower sleeve 2, the rotational motion is converted into the axial linear motion of the upper structure, thereby extending the entire device until the steel waler 7 at the top is tightly abutted against the foundation pit retaining structure. After adjustment, the self-locking characteristic of the helical pair can automatically maintain the tight state, forming a reliable force transmission path from the side wall 8 through the device body to the retaining structure, thus creating safe conditions for the subsequent removal of the steel support and conversion of the force system.

[0048] In summary, the device utilizes a fixed lower section consisting of a bottom sealing plate 1 and a lower sleeve 2, and a movable upper section consisting of an upper sleeve 3, a limiting screw 4, and a rotating handle 5. The limiting screw 4 and the lower sleeve 2 form a precision helical pair. One end of the device is fixed to the side wall 8 via a connecting steel plate 6, and the other end abuts against the enclosure structure via a steel waler 7. The helical pair transmission allows for stepless length adjustment up to 200mm, perfectly adapting to the width deviation of the trench on site. No cutting or filling is required. The device can be installed synchronously with the side wall 8. After the middle plate is completed, rotating the handle 5 quickly tightens it, completely eliminating the need for concrete pouring and curing, and greatly improving the speed of prefabricated construction. Furthermore, the device is safe and reliable under load, with a clear force flow path. The self-locking helical pair ensures stability, with a single key bearing capacity of 800kN and double keys meeting the design axial force of 1500kN, without damage during testing. The structure is simple; adjustment and fixing can be completed simply by rotating the handle 5 with a regular wrench, significantly reducing construction difficulty and cost.

[0049] Example 2 Reference Figures 1-7 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides a specific method for using the adjustable force transmission device, including its on-site application process in prefabricated foundation pit support replacement construction. The method includes the following steps: S1. Inside the foundation pit, hoist the side wall 8 to the design position, and reliably connect the connecting steel plate 6 of the device to the corresponding connecting parts pre-embedded on the side wall 8 with high-strength bolts, so that the device and the side wall 8 form a rigid whole. This step can be completed simultaneously with the assembly of the side wall 8 without taking up extra process time. S2. After the concrete pouring of the basement slab or floor slab of the construction section is completed and meets the support design requirements, accurately measure the actual net distance between the outer surface of the side wall 8 and the inner surface of the foundation pit retaining structure, such as the width of the trench, for example, the underground continuous wall or piles.

[0050] S3. The actual gap value is measured. The construction personnel use an ordinary wrench to put the rotating handle 5 at the upper end of the device and rotate it clockwise. The rotating handle 5 drives the upper sleeve 3 and the limiting screw 4 fixed to it to rotate synchronously. Since the limiting screw 4 and the lower sleeve 2 are engaged by threads, the rotational motion is converted into the axial extension motion of the limiting screw 4 relative to the lower sleeve 2, thereby increasing the total length of the device. The top steel waler 7 gradually presses against the foundation pit retaining structure. Through stepless adjustment, the device reaches the preset pressing length that matches the measured gap, and ensures that the steel waler 7 and the retaining structure surface are in uniform contact and bear force. S4. After the device is adjusted and tightened to the correct position, the self-locking effect of the screw pair keeps it stable under huge axial force without the need for additional locking. At this time, the device, together with the side wall 8 and the retaining structure, forms a reliable force transmission path. Subsequently, the original horizontal steel support corresponding to this position can be safely removed to complete the force conversion of the foundation pit support system. After that, subsequent processes such as backfilling of the trench can be carried out.

[0051] In summary, this embodiment provides a method for using an efficient, safe, and easy-to-operate adjustable force transmission device. This method fully utilizes the modular and adjustable characteristics of the device, achieving perfect integration with the prefabricated construction process. By replacing the complex traditional pouring and curing procedures with simple steps of measurement, rotation, and adjustment, it improves construction efficiency, reduces construction difficulty and cost, and ensures the structural safety and reliability of the support replacement process.

[0052] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0053] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An adjustable force transmission structure for prefabricated sidewalls and enclosures of a foundation pit, characterized in that: The lower section structure consists of a bottom sealing plate (1) and a lower sleeve (2), and the upper section structure consists of an upper sleeve (3), a limiting screw (4), and a rotating handle (5).

2. The adjustable force transmission structure of the prefabricated sidewall and enclosure for the foundation pit according to claim 1, characterized in that: The lower sleeve (2) is fixedly installed on the outside of the bottom sealing plate (1), and the rotating handle (5) is located on the outer periphery of the upper sleeve (3).

3. The adjustable force transmission structure of the prefabricated sidewall and enclosure for the foundation pit according to claim 2, characterized in that: The limiting screw (4) is fixed relative to the upper sleeve (3), and the end of the limiting screw (4) is threadedly engaged with the lower sleeve (2).

4. The adjustable force transmission structure of the prefabricated sidewall and enclosure for the foundation pit according to claim 3, characterized in that: A steel plate (6) is connected to the outside of the bottom sealing plate (1), and the steel plate (6) is used to connect to the side wall (8).

5. The adjustable force transmission structure of the prefabricated sidewall and enclosure for the foundation pit according to claim 4, characterized in that: A steel waler (7) is provided on one side of the upper sleeve (3), and the steel waler (7) is used to abut against the retaining structure of the foundation pit.

6. The adjustable force transmission structure of the prefabricated sidewall and enclosure for the foundation pit according to claim 5, characterized in that: The lower sleeve (2) and the upper sleeve (3) achieve relative axial extension and retraction through the screwing in or out of the limiting screw (4), thereby adjusting the force transmission distance between the bottom sealing plate (1) and the steel waler (7).

7. The adjustable force transmission structure of the prefabricated sidewall and enclosure for the foundation pit according to claim 6, characterized in that: The rotating handle (5) is used to drive the upper sleeve (3) and the limiting screw (4) fixed thereto to rotate synchronously to achieve telescopic adjustment.

8. The adjustable force transmission structure of the prefabricated sidewall and enclosure for the foundation pit according to claim 7, characterized in that: The steel waler (7) abuts against the foundation pit retaining structure, and the side wall (8) transmits the lateral load to the adjustable force transmission structure through the steel plate (6) and the bottom sealing plate (1).

9. The adjustable force transmission structure of the prefabricated sidewall and enclosure for the foundation pit according to claim 8, characterized in that: The limiting screw (4) and the lower sleeve (2) form a helical pair, which converts the rotational motion input by the rotating handle (5) into linear motion between the upper and lower structures.

10. The adjustable force transmission structure of the prefabricated sidewall and enclosure for the foundation pit according to claim 9, characterized in that: The rotating handle (5) and the limiting screw (4) are rotated to adjust the overall length so that the side wall (8) is tightly pressed against the enclosure structure.

Images