Foundation pit support axial force compensation device and deep and large foundation pit support bidirectional axial force compensation system and method

Abstract

The invention discloses a foundation pit support axial force compensation device, a deep and large foundation pit support bidirectional axial force compensation system and a deep and large foundation pit support bidirectional axial force compensation method. The device comprises two fixed bearing platforms which are vertically distributed on the two sides of one foundation pit support of two adjacent foundation pit supports of the same foundation pit support as the center; the other foundation pit support of the two adjacent foundation pit supports of the same foundation pit support is provided with two sliding bearing platforms with the centers vertically distributed on the two sides of the foundation pit support, and axial force jacks arranged between the fixed bearing platform on each side of the two adjacent foundation pit supports and the sliding bearing platforms on the corresponding sides of the two adjacent foundation pit supports. One end of the axial force jack is fixedly arranged on the fixed bearing platform, and the other end of the axial force jack is arranged on the sliding bearing platform in a sliding mode. According to the method, the two axial force jacks of each connecting node deviate in the same direction, different axial force values are applied to correct the axis dislocation of the two sections of foundation pit supports, the foundation pit supports are compensated in a segmented mode, foundation pit deformation is effectively controlled, and the surrounding environment of the foundation pit is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit engineering support, and in particular to a foundation pit support axial force compensation device, a deep and large foundation pit support bidirectional axial force compensation system and a method. Background Art

[0002] In the support of foundation pit engineering, the requirements for deformation control and environmental protection of deep and large foundation pit engineering are becoming increasingly higher. In soft soil areas, the commonly used internal support forms are steel support and concrete support. Among them, steel support is suitable for foundation pits with small plane dimensions and regular shapes. For foundation pits with high deformation control requirements, the steel support servo system can be used to adjust the axial force of the steel support; for foundation pits with large plane dimensions and complex shapes, such as deep and large foundation pits with a side length greater than 100m, the steel support cannot be used because the slenderness ratio cannot meet the limitation of axial compressive stability, so concrete support is required. Conventional steel support servo systems are usually installed at the boundary between the steel support and the foundation pit. They have good control effect on the end of the foundation pit, but poor axial force support effect in the middle section. In order to control the axial force of the middle section of the steel support, the prior art provides a method of setting an axial force jack in the middle section of the steel support in a single direction to improve the axial force of the middle section. The disadvantage is that the axial force jacks are installed at both ends of the coaxial steel support, and are affected by the misalignment and deformation of the steel support. Since the steel support column will more or less undergo lateral displacement during the construction process, the axial force jack will become eccentric and easily damaged or misaligned under the condition of large misalignment, which will lead to damage to the axial force jack, resulting in the inability of the steel supports at both ends to be continuously axially connected, resulting in failure of the steel support compensation mechanism. Summary of the invention

[0003] The purpose of the present invention is to provide a foundation pit support axial force compensation device, a deep and large foundation pit support bidirectional axial force compensation system and method, so as to solve the problem that the traditional axial force jack misalignment leads to the failure of steel support axial force compensation.

[0004] In order to solve the above technical problems, the present invention provides an axial force compensation device for foundation pit support, including two fixed pedestals vertically distributed on both sides of one section of two adjacent sections of foundation pit support on the same foundation pit support as the center, two sliding pedestals vertically distributed on both sides of the other section of two adjacent sections of foundation pit support on the same foundation pit support as the center, and an axial force jack arranged between the fixed pedestals on each side of the two adjacent sections of foundation pit support and the sliding pedestals on the corresponding side, the axial force jack being fixedly arranged on the fixed pedestals, and the axial force jack being slidably arranged on the sliding pedestals.

[0005] Furthermore, the present invention provides an axial force compensation device for foundation pit support, wherein the fixed pedestal includes a first support member vertically arranged on a section of the foundation pit support, a stiffening plate or a diagonal member connected between the first support member and the foundation pit support where it is located; the inner surface of the first support member is fixedly connected or detachably connected to one end of the axial force jack; the sliding pedestal includes a second support member arranged on another section of the foundation pit support, a stiffening plate or a diagonal member connected between the second support member and the foundation pit support where it is located, and a sliding layer arranged on the inner surface of the second support member; the other end of the axial force jack is slidably connected to the sliding layer of the second support member.

[0006] Furthermore, the foundation pit support axial force compensation device provided by the present invention is provided with limiting members perpendicular to the inner surface of the second support member and at least on two sides parallel to the axial force jack, and the other end of the axial force jack is slidably connected to the sliding layer within the range of the limiting member.

[0007] Furthermore, in the foundation pit support axial force compensation device provided by the present invention, the slip layer is spherical balls evenly arranged on the inner surface of the second support member.

[0008] Furthermore, the foundation pit support axial force compensation device provided by the present invention also includes a pressure sensor arranged between the axial force jack and the fixed pedestal or the sliding pedestal.

[0009] In order to solve the above technical problems, the present invention also provides a deep and large foundation pit support bidirectional axial force compensation system, including multiple foundation pit support axial force compensation devices as described above, which are arranged between the connection points of the same foundation pit support in the horizontal and vertical directions.

[0010] Furthermore, in the bidirectional axial force compensation system for deep and large foundation pit supports provided by the present invention, the foundation pit support axial force compensation devices of the upper and lower foundation pit supports are staggered in distribution.

[0011] In order to solve the above technical problems, the present invention further provides a deep and large foundation pit support bidirectional axial force compensation method, which adopts the above deep and large foundation pit support bidirectional axial force compensation system, comprising:

[0012] When the axes of the two sections of the foundation pit supports at each connection node of each foundation pit support are aligned, the lateral axial force of each horizontal foundation pit support is compensated in sections by controlling the same axial force value of the lateral axial force jacks on both sides of each connection node of each horizontal foundation pit support; the longitudinal axial force of each longitudinal foundation pit support is compensated in sections by controlling the same axial force value of the longitudinal axial force jacks on both sides of each connection node of each longitudinal foundation pit support;

[0013] When the axes of two sections of foundation pit supports are misaligned at each connection node of each foundation pit support, the different axial force values ​​of the lateral axial force jacks on both sides of each connection node of each horizontal foundation pit support are controlled so that the axial force jacks produce different displacement distances on the corresponding sliding bearing platform, so as to correct the axial misalignment of each horizontal foundation pit support and compensate the lateral axial force of each horizontal foundation pit support in sections; the different axial force values ​​of the longitudinal axial force jacks on both sides of each connection node of each longitudinal foundation pit support are controlled so that the axial force jacks produce different displacement distances on the corresponding sliding bearing platform, so as to correct the axial misalignment of each longitudinal foundation pit support and compensate the longitudinal axial force of each longitudinal foundation pit support in sections.

[0014] Furthermore, the bidirectional axial force compensation method for deep and large foundation pit support provided by the present invention uses formula (1) to adjust the different axial force values ​​of the axial force jacks on both sides of each connection node to correct the axial center misalignment of the foundation pit support;

[0015] NΔ=N1 (h-Δ)-N2 (h+Δ) (1);

[0016] Among them, N1 is the axial force value applied by the axial force jack on one side, N2 is the axial force value applied by the axial force jack on the other side, h is half of the height of the foundation pit support section, and Δ is the offset distance.

[0017] Furthermore, the bidirectional axial force compensation method for deep and large foundation pit supports provided by the present invention, after the axial force jacks on both sides of each connection node shrink and creep for a period of time, concrete is poured between the second section of the foundation pit supports of each connection node to replace the axial force jacks at the corresponding positions.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a foundation pit support axial force compensation device, a deep and large foundation pit support bidirectional axial force compensation system and a method, which increase the number of axial force jacks traditionally connected between the axial centers of the gap between two adjacent sections of foundation pit supports to two, and connect the two axial force jacks of each connection node in parallel to the two sides of the adjacent two sections of foundation pit supports and through a fixed pedestal and a sliding pedestal respectively vertically arranged on the two sections of foundation pit supports, so that the axial force jacks are located on both sides of the gap between the two adjacent sections of foundation pit supports at each connection node; when the axial centers of the two sections of foundation pit supports at each connection node are misaligned, the axial center misalignment of the two sections of foundation pit supports at the corresponding connection node is corrected by offsetting the two axial force jacks of the connection node in the same direction on the sliding pedestal and applying different axial force values, and the transverse and longitudinal axial forces of each transverse and longitudinal foundation pit support are compensated in sections, so that the axial force of the corresponding foundation pit support is effectively supported on the foundation pit enclosure, the overall axial force bearing performance of the super-long foundation pit support is improved, the problem of intermediate bending deformation is avoided, the failure of the foundation pit support is avoided, the deformation of the foundation pit is effectively controlled, and the surrounding environment of the foundation pit is protected.

[0020] The foundation pit support axial force compensation device, deep and large foundation pit support bidirectional axial force compensation system and method provided by the present invention can perform axial force compensation on the same foundation pit support of the corresponding node in sections through the axial force jacks of each connecting node, and can evenly control the axial deformation of each section of the foundation pit support, avoid damage caused by uneven deformation of the foundation pit support, reduce the safety risk of foundation pit construction, and especially improve the deformation control of deep and large foundation pits using extra-long concrete supports as foundation pit supports.

[0021] The foundation pit support axial force compensation device, deep and large foundation pit support bidirectional axial force compensation system and method provided by the present invention adopt the arrangement of biaxial force jacks at each node, and can effectively resist the dislocation deformation and creep shrinkage capacity of the foundation pit support by adjusting the different axial force values ​​of the biaxial force jacks.

[0022] The present invention provides a bidirectional axial force compensation system and method for deep and large foundation pit supports. Through the transverse and longitudinal foundation pit support axial force compensation devices, bidirectional axial force compensation can be performed on the transverse and longitudinal foundation pit supports, thereby improving the overall axial force bearing performance of the foundation pit supports in two directions, improving the control effect on foundation pit deformation, and avoiding the problem of invalid support caused by insufficient axial force of the foundation pit support in another direction due to axial force control of the foundation pit support in one direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the planar structure of the concrete support arranged in the foundation pit and the foundation pit support axial force compensation device distributed thereon;

[0024] Figure 2 It is a schematic diagram of the elevation structure of the foundation pit excavation and a layer of concrete support arranged inside it;

[0025] Figure 3 It is a schematic diagram of the planar structure of the foundation pit support axial force compensation device;

[0026] Figure 4 It is a detailed structural diagram of the foundation pit support axial force compensation device;

[0027] Figure 5 It is a mechanical relationship diagram of the axial force applied by the axial force jacks on both sides of the foundation pit support axial force compensation device;

[0028] As shown in the figure:

[0029] 100, foundation pit, 101, central pit, 102, peripheral pit;

[0030] 200. Foundation pit support;

[0031] 300. Foundation pit support axial force compensation device, 310. Fixed bearing platform, 311. First supporting member, 312. Stiffening plate, 320. Sliding bearing platform, 321. Second supporting member, 322. Sliding layer, 323. Limiting member, 330. Axial force jack, 340. Pressure sensor. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with the accompanying drawings: The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0033] Embodiment 1

[0034] Please refer to Figure 3 to Figure 4 The embodiment of the present invention provides a foundation pit support axial force compensation device 300, including two fixed caps 310 vertically distributed on both sides of one foundation pit support 200 of two adjacent sections of the same foundation pit support 200, two sliding caps 320 vertically distributed on both sides of the other foundation pit support 200 of two adjacent sections of the same foundation pit support 200, and an axial force jack 330 disposed between the fixed caps 310 on each side of the two adjacent sections of the foundation pit support 200 and the sliding caps 320 on the corresponding side, wherein the axial force jack 330 is fixedly disposed on the fixed caps 310, and the axial force jack 330 is slidably disposed on the sliding caps 320. The foundation pit support 200 includes but is not limited to a concrete support, and may also be a steel support.

[0035] The foundation pit support axial force compensation device 300 provided in the embodiment of the present invention increases the number of axial force jacks 330 traditionally connected between the axial centers of the gap between two adjacent sections of the foundation pit support 200 to two, and the two axial force jacks 330 of each connection node are parallel to the two sides of the adjacent two sections of the foundation pit support 200 and connected through a fixed bearing platform 310 and a sliding bearing platform 320 respectively vertically arranged on the two sections of the foundation pit support 200, so that the axial force jacks 330 are located on both sides of the gap between the two adjacent sections of the foundation pit support 200 of each connection node; When the axial center is misaligned, the two axial force jacks 330 of the connection node are offset in the same direction on the sliding platform 320 and different axial force values ​​are applied to correct the axial center misalignment of the two sections of the foundation pit support 200 of the corresponding connection node and compensate the transverse and longitudinal axial forces of each transverse and longitudinal foundation pit support 200 in sections, so that the axial force of the corresponding foundation pit support 200 is effectively supported on the foundation pit enclosure, improving the overall axial force bearing performance of the super-long foundation pit support 200, avoiding the problem of intermediate bending deformation, avoiding the failure of the foundation pit support 200, effectively controlling the deformation of the foundation pit, and protecting the surrounding environment of the foundation pit.

[0036] Please refer to Figure 3 to Figure 4 In order to install and support the axial force jack 330, the foundation pit support axial force compensation device 300 provided in the embodiment of the present invention, the fixed bearing platform 310 includes a first support member 311 vertically arranged on a section of the foundation pit support 200, a stiffening plate 312 or a diagonal member connected between the first support member 311 and the foundation pit support 200 where it is located; the inner surface of the first support member 311 is fixedly connected or detachably connected to one end of the axial force jack 330; the sliding bearing platform 320 includes a second support member 321 arranged on another section of the foundation pit support 200, a stiffening plate 312 or a diagonal member connected between the second support member 321 and the foundation pit support 200 where it is located, and a sliding layer 322 arranged on the inner surface of the second support member 321; the other end of the axial force jack 330 is slidably connected to the sliding layer 322 of the second support member 321. The first support member 311 and the second support member 321 can be steel plates, steel frames, steel sections, etc., wherein the stiffening plate 312 can be an angle plate, and the diagonal member can be a steel bar; wherein the shaft seat end of the axial force jack 330 can be welded or detachably connected to the first support member 311 by bolts, and the shaft rod ejecting end of the axial force jack 330 can be contacted and connected to the sliding layer 322, so that the axial force jack 330 can be slidably connected on the sliding layer 322, thereby reliably installing the axial force jack 330 on both sides parallel to the axial direction of the two adjacent sections of the foundation pit support 200.

[0037] Please refer to Figure 3 to Figure 4 In order to limit the maximum offset distance of the axial force jack 330, ensure the safe support of the axial force jack 330, and avoid damage when the axial center deviation of the two adjacent sections of the foundation pit support 200 is too large, the foundation pit support axial force compensation device 300 provided in the embodiment of the present invention is perpendicular to the inner surface of the second support member 321 and at least on both sides parallel to the axial force jack 330. A limiting member 323 is arranged, and the other end of the axial force jack 330 is slidably connected to the sliding layer 322 within the range of the limiting member 323. The limiting members 323 are in at least two directions, and limiting members 323 can also be arranged in the other two directions, thereby forming limiting members 323 in four directions. Figure 3 It can be seen that the axial force jack 330 on each side can at least slide in the left and right directions of the foundation pit support 200, and at this time, the two adjacent sections of the foundation pit support 200 are axially misaligned in the horizontal direction; Figure 4It can be seen that the axial force jack 330 on each side can also slide in the up and down direction, and at this time, the two adjacent sections of the foundation pit support 200 have an axial misalignment in the vertical direction. Of course, there is also an axial misalignment in the four directions of up, down, left, and right between the two adjacent sections of the foundation pit support 200, and at this time, the axial force jack 330 can slide in the four directions of up, down, left, and right. The limiter 323 can be a plate or a plurality of discretely distributed columnar members.

[0038] Please refer to Figure 4 In order to make the axial force jack 330 slide in four directions, the foundation pit support axial force compensation device 300 provided by the embodiment of the present invention has the sliding layer 322 being spherical balls evenly arranged on the inner surface of the second support member 321. At this time, the top end of the shaft of the axial force jack 330 contacts the spherical balls and moves relative to the spherical balls.

[0039] Please refer to Figure 3 In order to adjust the axial force value of each side axial force jack 330, the foundation pit support axial force compensation device 300 provided by the embodiment of the present invention further includes a pressure sensor 340 disposed between the axial force jack 330 and the fixed bearing platform 310 or the sliding bearing platform 320. The axial force value applied by each axial force jack 330 is monitored by the pressure sensor 340.

[0040] Embodiment 2

[0041] Please refer to Figures 1 to 4 In order to perform bidirectional axial compensation on the same foundation pit support 200 and improve the effect of the foundation pit support, the embodiment of the present invention also provides a bidirectional axial force compensation system 10 for deep and large foundation pit support, including a plurality of foundation pit support axial force compensation devices 300 as described in the first embodiment above, arranged between the connection points of the same foundation pit support 200 in the horizontal and vertical directions. Please refer to Figure 1 As shown, each foundation pit support 200 in the same direction is divided into several sections, and a foundation pit support axial force compensation device 300 is provided at the connection node between two adjacent sections of the foundation pit support.

[0042] In order to facilitate the installation of each foundation pit support 200 and avoid the lack of operating space at the same vertical node of the upper and lower foundation pit supports 200, the deep and large foundation pit support bidirectional axial force compensation system 10 provided by the embodiment of the present invention has the foundation pit support axial force compensation devices 300 of the upper and lower foundation pit supports 200 staggered in distribution.

[0043] The embodiment of the present invention further provides a method for compensating bidirectional axial force of deep and large foundation pit support, using the above-mentioned bidirectional axial force compensation system 10 for deep and large foundation pit support, comprising:

[0044] When the axes of the two sections of the foundation pit supports 200 are aligned at each connection node of each foundation pit support 200, the lateral axial force of each horizontal foundation pit support 200 is compensated in sections by controlling the same axial force value of the lateral axial force jacks 330 on both sides of each connection node of each horizontal foundation pit support 200; the longitudinal axial force of each longitudinal foundation pit support 200 is compensated in sections by controlling the same axial force value of the longitudinal axial force jacks 330 on both sides of each connection node of each longitudinal foundation pit support 200.

[0045] When the axes of two sections of foundation pit supports 200 are misaligned at each connection node of each foundation pit support 200, the different axial force values ​​of the lateral axial force jacks 330 on both sides of each connection node of each horizontal foundation pit support 200 are controlled so that the axial force jacks 330 produce different displacement distances on the corresponding sliding platform 320 to correct the axis misalignment of each horizontal foundation pit support 200 and compensate the lateral axial force of each horizontal foundation pit support 200 in sections; the different axial force values ​​of the longitudinal axial force jacks 330 on both sides of each connection node of each longitudinal foundation pit support 200 are controlled so that the axial force jacks 330 produce different displacement distances on the corresponding sliding platform 320 to correct the axis misalignment of each longitudinal foundation pit support 200 and compensate the longitudinal axial force of each longitudinal foundation pit support 200 in sections.

[0046] The segmentation refers to multiple segments, and the same foundation pit support 200 includes at least more than two segments, where "more than" includes the number itself.

[0047] The foundation pit support axial force compensation device 300, deep and large foundation pit support bidirectional axial force compensation system 10 and method provided by the embodiment of the present invention can perform axial force compensation on the same foundation pit support 200 of the corresponding node in sections through the axial force jacks 330 of each connection node, and can evenly control the axial deformation of each section of the foundation pit support 200, avoid damage caused by uneven deformation of the foundation pit support 200, reduce the safety risk of foundation pit construction, and especially improve the deformation control of deep and large foundation pits using extra-long concrete supports as foundation pit supports 200. The longer concrete support refers to a concrete support with a length greater than 100m. In addition, through multi-segment compensation, the situation of excessive deformation of the same foundation pit support 200 can be adjusted section by section within a small range, thereby adjusting the overall deformation problem of the same foundation pit support 200, so as to align the axial centers of the segments of the same foundation pit support 200 or reduce the axial center deviation of each segment to correct the axial center of the same foundation pit support.

[0048] The foundation pit support axial force compensation device 300, deep and large foundation pit support bidirectional axial force compensation system 10 and method provided in the embodiments of the present invention perform step-by-step axial force loading, adjust the applied axial force by the axial force jack 330 according to the pressure value fed back by the pressure sensor 340, and control the deformation of the retaining structure in the subsequent construction process of the foundation pit.

[0049] The foundation pit support axial force compensation device 300, deep and large foundation pit support bidirectional axial force compensation system 10 and method provided in the embodiments of the present invention adopt the arrangement of dual-axis force jacks 330 at each node. By adjusting the different axial force values ​​of the dual-axis force jacks 330, the dislocation deformation and creep shrinkage capacity of the foundation pit support 200 can be effectively resisted.

[0050] The embodiment of the present invention provides a bidirectional axial force compensation system 10 and method for deep and large foundation pit supports. Through the transverse and longitudinal foundation pit support axial force compensation device 300, bidirectional axial force compensation can be performed on the transverse and longitudinal foundation pit supports 200, thereby improving the overall axial force bearing performance of the foundation pit supports 200 in two directions, improving the control effect on foundation pit deformation, and avoiding the problem of invalid support caused by insufficient axial force of the foundation pit support 200 in another direction due to axial force control of the foundation pit support 200 in one direction.

[0051] Please refer to Figure 5 In order to control the axial force value of each connection node under the maximum deviation, the deep and large foundation pit support bidirectional axial force compensation method provided by the embodiment of the present invention can use formula (1) to adjust the different axial force values ​​of the axial force jacks 330 on both sides of each connection node to correct the axial center misalignment of the foundation pit support 200;

[0052] NΔ=N1 (h-Δ)-N2 (h+Δ) (1);

[0053] Among them, N1 is the axial force value applied by the axial force jack 330 on one side, N2 is the axial force value applied by the axial force jack 330 on the other side, h is half of the cross-sectional height of the foundation pit support 200, and Δ is the offset distance.

[0054] According to formula (1), N1=1 / 2N+NΔ / h, N2=1 / 2N-NΔ / h is calculated, so that the offset distance Δ is within the allowable range.

[0055] When the foundation pit support 200 is a concrete support, in order to reduce costs and realize the recycling of the foundation pit support axial force compensation device 300, the deep and large foundation pit support bidirectional axial force compensation method provided by the embodiment of the present invention is that after the axial force jacks 330 on both sides of each connection node shrink and creep for a period of time, concrete is poured between the next section of the foundation pit support 200 at each connection node to replace the axial force jacks 330 at the corresponding position. At this time, at least the axial force jacks 300 are removed, and the fixed pedestal 310, the sliding pedestal 320 and the pressure sensor 340 can also be removed. The filling cross-section of the later poured concrete is larger than the cross-section of the first poured concrete support, ensuring that when the two sections of the segmented support are misaligned due to the bidirectional concrete support, the axial force will not be eccentric when transmitted to the next section.

[0056] Please refer to Figure 2The embodiment of the present invention provides a bidirectional axial force compensation method for deep and large foundation pit supports, wherein the support sequence of each support 200 includes but is not limited to first constructing the horizontal and vertical foundation pit supports 200 in the central pit 201, and then constructing the horizontal and vertical foundation pit supports 200 between the peripheral pit 202 and the central pit 201; at this time, the excavation sequence of the foundation pit 200 is to first excavate the central pit 201, and then excavate the peripheral pit 202 along the periphery of the central pit 201.

[0057] The deep and large foundation pit support bidirectional axial force compensation system 10 and method provided in the embodiment of the present invention adopts multiple foundation pit support axial force compensation devices 300 to perform active compensation on the same extra-long concrete support, which can evenly control the axial deformation of each section of concrete support, avoid support damage caused by uneven deformation of concrete support, reduce the safety risk of foundation pit construction, improve the deformation control of ultra-deep and ultra-large foundation pits using extra-long concrete supports, and achieve effective protection of the surrounding environment.

[0058] The present invention is not limited to the above-mentioned specific implementation modes. Obviously, the above-mentioned embodiments are only some embodiments of the embodiments of the present invention, but not all embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention. Those skilled in the art can make other levels of modifications and changes to the present invention. In this way, if these modifications and changes of the present invention fall within the scope of the claims of the present invention, the present invention is also intended to include these changes and changes.

Claims

1. A foundation pit support axial force compensation device, characterized in that: It includes two adjacent sections of foundation pit supports on the same foundation pit support, one section of the foundation pit support is a two fixed pedestals centrally distributed and vertically arranged on both sides thereof, the other section of the foundation pit support is a two sliding pedestals centrally distributed and vertically arranged on both sides thereof, and an axial force jack arranged between the fixed pedestals on each side of the two adjacent sections of foundation pit supports and the sliding pedestals on the corresponding side, wherein the axial force jack is fixedly arranged on the fixed pedestals, and the axial force jack is slidably arranged on the sliding pedestals.

2. The foundation pit support axial force compensation device according to claim 1 is characterized in that: The fixed bearing platform includes a first support member vertically arranged on a section of the foundation pit support, a stiffening plate or a diagonal member connected between the first support member and the foundation pit support where it is located; the inner surface of the first support member is fixedly connected or detachably connected to one end of the axial force jack; the sliding bearing platform includes a second support member arranged on another section of the foundation pit support, a stiffening plate or a diagonal member connected between the second support member and the foundation pit support where it is located, and a sliding layer arranged on the inner surface of the second support member; the other end of the axial force jack is slidably connected to the sliding layer of the second support member.

3. The foundation pit support axial force compensation device according to claim 2 is characterized in that: A limiting member is arranged perpendicular to the inner surface of the second supporting member and at least on two sides parallel to the axial force jack, and the other end of the axial force jack is slidably connected to the sliding layer within the range of the limiting member.

4. The foundation pit support axial force compensation device according to claim 2 is characterized in that: The slip layer is spherical balls evenly arranged on the inner surface of the second support member.

5. The foundation pit support axial force compensation device according to claim 1 is characterized in that: It also includes a pressure sensor arranged between the axial force jack and the fixed bearing platform or the sliding bearing platform.

6. A deep and large foundation pit support bidirectional axial force compensation system, characterized in that: It comprises a plurality of foundation pit support axial force compensation devices as described in any one of claims 1-5, which are arranged between the connection points of the same foundation pit support in the transverse and longitudinal directions.

7. The deep and large foundation pit support bidirectional axial force compensation system according to claim 6 is characterized in that: The foundation pit support axial force compensation devices of the upper and lower foundation pit supports are staggered in distribution.

8. A method for compensating bidirectional axial forces of deep and large foundation pit supports, characterized in that: The deep foundation pit support bidirectional axial force compensation system according to any one of claims 6 to 7 comprises: When the axes of the two sections of the foundation pit supports at each connection node of each foundation pit support are aligned, the lateral axial force of each horizontal foundation pit support is compensated in sections by controlling the same axial force value of the lateral axial force jacks on both sides of each connection node of each horizontal foundation pit support; the longitudinal axial force of each longitudinal foundation pit support is compensated in sections by controlling the same axial force value of the longitudinal axial force jacks on both sides of each connection node of each longitudinal foundation pit support; When the axes of two sections of foundation pit supports are misaligned at each connection node of each foundation pit support, the different axial force values ​​of the lateral axial force jacks on both sides of each connection node of each horizontal foundation pit support are controlled so that the axial force jacks produce different displacement distances on the corresponding sliding bearing platform, so as to correct the axial misalignment of each horizontal foundation pit support and compensate the lateral axial force of each horizontal foundation pit support in sections; the different axial force values ​​of the longitudinal axial force jacks on both sides of each connection node of each longitudinal foundation pit support are controlled so that the axial force jacks produce different displacement distances on the corresponding sliding bearing platform, so as to correct the axial misalignment of each longitudinal foundation pit support and compensate the longitudinal axial force of each longitudinal foundation pit support in sections.

9. The method for compensating bidirectional axial forces of deep and large foundation pit support according to claim 8 is characterized in that: Formula (1) is used to adjust the different axial force values ​​of the axial force jacks on both sides of each connection node to correct the axial misalignment of the foundation pit support; NΔ=N1 (h-Δ)-N2 (h+Δ) (1); Among them, N1 is the axial force value applied by the axial force jack on one side, N2 is the axial force value applied by the axial force jack on the other side, h is half of the height of the foundation pit support section, and Δ is the offset distance.

10. The method for compensating bidirectional axial forces of deep and large foundation pit support according to claim 8, characterized in that: After the axial force jacks on both sides of each connection node shrink and creep for a period of time, concrete is poured between the second section foundation pit supports of each connection node to replace the axial force jacks at the corresponding positions.

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