A self-stabilizing inner-support-free foundation pit supporting structure

Abstract

The application discloses a self-stabilizing inner-support-free foundation pit supporting structure and belongs to the technical field of foundation pit supporting. The self-stabilizing inner-support-free foundation pit supporting structure comprises a main supporting plate, the main supporting plate is connected with a driving mechanism, the driving mechanism drives the main supporting plate to move horizontally and abut against or separate from the side wall of a foundation pit, a sub-supporting plate is arranged on the main supporting plate, the sub-supporting plate is connected with a linkage mechanism, the linkage mechanism drives the sub-supporting plate to act in combination with or separate from the main supporting plate, when the sub-supporting plate and the main supporting plate are in a combined state, the sub-supporting plate and the main supporting plate form an integral plate, when the sub-supporting plate and the main supporting plate are in a separated state, the sub-supporting plate and the main supporting plate are used for abutting against the side wall of the foundation pit respectively, the main supporting plate is driven by the driving mechanism to abut against the inner wall of the foundation pit, so that the abutting support of the inner wall of the foundation pit is realized, and the reliability of the support of the foundation pit is ensured; the supporting structure is convenient for the foundation pit supporting operation in a limited space, reduces the construction difficulty, improves the foundation pit construction efficiency, and is convenient for subsequent supporting dismounting and other operations.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, specifically to a self-stabilizing foundation pit support structure without internal support. Background Technology

[0002] Deep foundation pit engineering has been involved in all construction projects throughout history. The continuous expansion of cities has driven the rapid development of civil engineering, with high-rise buildings increasingly becoming the darlings of urban construction. Underground parking garages, basements, underground subway stations, underground civil defense projects, and many other underground structures are gradually emerging, and deep foundation pit construction engineering is also reaching its zenith. We must develop and improve deep foundation pit construction engineering, as this is of great significance for ensuring project quality and safety, and for completing construction tasks economically. The importance of deep foundation pit construction for super high-rise buildings and large-scale construction projects is self-evident, and deep foundation pit technology is the foundation upon which safe operations in deep foundation pit construction depend.

[0003] The main difference between deep and shallow foundation pits lies in their depth. Pit depths of 5 meters or more are classified as deep. During excavation, if a temporary model room is located on the unexcavated southern side of the pit, and to prevent soil collapse around the pit without demolishing the model room, it is necessary to prevent deformation and damage to existing buildings when excavating deep pits with depths exceeding 10 meters. This ensures safe construction under the deep pit and minimizes its impact on nearby buildings. Timely and stable support is required. When supporting foundation pits with limited internal or working space, the support equipment must be easily hoisted and installed. For pits with restricted space, the requirements for support equipment are even more stringent. Currently, there is an urgent need for a support structure capable of operating in foundation pits with limited working space. Summary of the Invention

[0004] 1. The problem to be solved

[0005] The purpose of this invention is to provide a self-stabilizing, unsupported foundation pit support structure that facilitates foundation pit support operations in confined spaces, thereby reducing the construction difficulty of foundation pit construction, improving foundation pit construction efficiency, and facilitating subsequent support dismantling and other operations.

[0006] 2. Technical Solution

[0007] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0008] A self-stabilizing, unsupported foundation pit support structure includes a main support plate and a secondary support plate. The main support plate is connected to a driving mechanism, which drives the main support plate to move horizontally and abut against or separate from the foundation pit sidewall. A secondary support plate is provided on the main support plate and is connected to a linkage mechanism. The linkage mechanism drives the secondary support plate to merge or separate from the main support plate. When the secondary support plate and the main support plate are in the merged state, they form a single, continuous plate. When the secondary support plate and the main support plate are in the separated state, they abut against the foundation pit sidewall. By designing the overall structure of the support structure, a support structure that can be unfolded and folded according to actual usage needs is designed to solve the support problem of foundation pits in confined spaces. It offers excellent support performance and is easy to operate.

[0009] Furthermore, the support structure of the present invention also includes the following specific designs:

[0010] The outer side of the main support plate and the secondary support plate that are connected to the foundation pit is generally arc-shaped, and the outer arc surfaces of the main support plate and the secondary support plate are arranged concentrically.

[0011] The linkage mechanism drives the secondary support plate to rotate around the center of the outer arc surface and to engage or separate from the main support plate.

[0012] As a further optimization of the present invention, the support structure also includes a support base and a safety monitoring device. The main support plate is set on the support base, the support base is installed at the bottom of the pit, the support base is connected to one end of an anchor rope, and the anchor rope extends out of the opening of the pit and is connected to an anchor rod on the outside of the pit.

[0013] The main support plate and the secondary support plate are connected to the safety monitoring equipment. The safety monitoring equipment is used to detect the expansion and contraction deformation of the main support plate and the secondary support plate, and to adjust the connection force between the main support plate and the secondary support plate and the side wall of the foundation pit driven by the drive mechanism.

[0014] As a further optimization of the present invention, the secondary support plate includes a first secondary support plate and a second secondary support plate. The first secondary support plate has an opening for accommodating the main support plate and is provided with a sliding rail. The second secondary support plate is provided with a sliding support plate, which is slidably disposed on the sliding rail.

[0015] As a further optimization of the present invention, the driving mechanism includes a connecting push head, a driving screw, a driving nut, and a hydraulic motor. The connecting push head is located inside the main support plate, that is, on the side away from the pit sidewall. The connecting push head is connected to the driving screw. The driving screw is arranged horizontally and cooperates with the driving nut. The driving nut is rotatably mounted on the support frame. The power unit is used to drive the driving nut to rotate.

[0016] One end of the drive nut is mounted on the turntable of the thrust bearing, and the other end of the drive nut is mounted on a drive gear. The drive gear meshes with the power gear, and the power gear is connected to the output shaft of the hydraulic motor. The hydraulic motor and the thrust bearing are mounted on the support frame.

[0017] As a further optimization of the present invention, the connecting push head includes a connecting frame plate. The inner side of the main support plate is hinged to one end of the connecting arm. Two sets of connecting arms are provided, and the two sets of connecting arms are generally in the shape of an "eight". The other end of the connecting arm is hinged to the connecting frame plate. The hinge shafts at both ends of the connecting arm are arranged vertically. A support guide is provided on the connecting frame plate. The support guide is horizontal and perpendicular to the inner side of the main support plate. A support spring is provided inside the support guide. A support pin is provided inside the support spring. The support pin is slidably disposed inside the support guide. The two ends of the support spring abut against one end of the support pin and one end of the support guide, respectively. A support ball is provided at the end of the support pin extending out of the support guide. The support ball abuts against the inner side of the main support plate.

[0018] As a further optimization of the present invention, the linkage mechanism includes a first connecting rod disposed inside the first secondary support plate, one end of the first connecting rod being hinged to the inner side plate of the first secondary support plate, the other end of the first connecting rod being hinged to a second connecting rod, the hinge shafts at both ends of the first connecting rod being vertical, the inner side of the second secondary support plate being hinged to one end of a first support rod, the other end of the first support rod being hinged to a second support rod, the hinge shafts at both ends of the first support rod being vertical, and the ends of the second connecting rod and the second support rod being respectively hinged to a support rod.

[0019] The hinged ends of the second connecting rod and the second bracket rod are arranged coaxially with the support rod, and the lower end of the support rod is connected to the support base.

[0020] Two actuating rods are vertically arranged in the area between the inner sides of the second connecting rod and the second support rod. The two actuating rods are respectively located at one end of the drive arm, and the other end of the drive arm is connected to the piston rod of the drive cylinder. The piston rod of the drive cylinder is arranged horizontally. The rod bodies of the two actuating rods abut against or separate from the inner sidewalls of the second connecting rod and the second support rod, respectively. When the drive cylinder drives the two actuating rods to approach the cylinder body, the included angle between the second connecting rod and the second support rod is in a state of increasing. When the drive cylinder drives the two sets of actuating rods away from the cylinder body, the included angle between the second connecting rod and the second support rod (defined as the included angle toward the main support plate 100) is in a state of decreasing.

[0021] The drive arm is also provided with two drive levers, which are arranged vertically and located in the area between the outer side of the second connecting rod and the second support rod. The two sets of drive levers are respectively abutted against or separated from the outer side wall of the second connecting rod and the second support rod. When the drive cylinder drives the two sets of drive levers away from the cylinder body, the included angle between the second connecting rod and the second support rod is in a decreasing state.

[0022] One end of the drive arm is hinged to the drive slider, the hinge axis of the drive arm is arranged vertically, a stop bar extends from the drive slider, the stop bar is arranged vertically and its body abuts against or separates from the outside of the drive arm.

[0023] As a further optimization of the present invention, a support adjustment plate is hinged to one side of the first secondary support plate, the hinge axis of the support adjustment plate is arranged vertically, and a support angle adjustment unit is provided on the first secondary support plate, the support angle adjustment unit being used to adjust the included angle between the support adjustment plate and the first secondary support plate.

[0024] As a further optimization of the present invention, the upper and lower ends of the support adjustment plate are respectively provided with adjustment rails, the support angle adjustment unit includes an adjustment wheel disposed in the adjustment rail, the wheel core of the adjustment wheel is arranged vertically, the adjustment wheel is rotatably disposed at one end of the adjustment arm, the other end of the adjustment arm is rotatably disposed on the first auxiliary support plate, the rotation axis of the adjustment arm is vertical, the middle section of the adjustment arm is hinged to the piston rod of the adjustment cylinder, and the piston rod of the adjustment cylinder is arranged horizontally.

[0025] As a further optimization of the present invention, the support base includes a first base and a second base, the lower end of the support rod is fixed on the first base, the second base and the first base form a horizontal sliding fit, and the lower ends of the first auxiliary support plate and the second auxiliary support plate cooperate with the second base.

[0026] A first support rod is provided at the lower end of the hinge shaft between the first auxiliary support plate and the support adjustment plate, and a second support rod is provided at the lower end of the second auxiliary support plate. A first support groove plate and a second support groove plate are provided on the second base. The lower end of the first support rod is connected to the first support groove plate, and the lower end of the second support rod is connected to the second support groove plate.

[0027] As a further optimization of the present invention, the first support rod and the second support rod are provided with ball bearings on their sides and lower ends. The first support groove plate and the second support groove plate are in the shape of strips. The ball bearings abut against the bottom and wall of the groove of the first support groove plate and the second support groove plate. One end of the first support groove plate and the second support groove plate are hinged to the second seat body and the hinge axis is arranged vertically.

[0028] As a further optimization of the present invention, a first insert wedge is provided on one side of the first support groove plate and the second support groove plate, and a second insert wedge is arranged in an array on the outer side of the main support plate. Fixed anchor rods that form an insert fit with the bottom of the foundation pit are provided around the first base body.

[0029] As a further optimization of the present invention, an anchoring bracket is provided on the support frame on the support base body. One end of the anchoring bracket is hinged to the upper end of the support frame, and the other end is connected to one end of the anchor rope. The other end of the anchor rope is vertically downward and connected to the anchor rod.

[0030] The anchoring bracket is equipped with a pressure roller with its center horizontal. The pressure roller abuts against the upper end of the support frame. The anchor rope includes two sets of anchor rope segments. One end of each set of anchor rope segments is connected to the anchoring bracket and the anchor rod, respectively. The other end of each set of anchor rope segments is connected to the anchor bolt. The two sets of anchor bolts are respectively matched with the two ends of the anchor pipe.

[0031] As a further optimization of the present invention, the safety monitoring device includes a safety monitoring plate disposed on the outer side of the first and second auxiliary support plates. The array of safety monitoring plates is disposed on the outer side of the first and second auxiliary support plates. The safety monitoring plate is in sliding fit with the first and second auxiliary support plates. The sliding direction of the safety monitoring plate is perpendicular to the outer side of the first and second auxiliary support plates. A detection sensor is disposed on the inner side of the safety monitoring plate. The detection sensor is used to detect the displacement of the safety monitoring plate.

[0032] Specifically, the outer side of the first auxiliary support plate is provided with a first opening, and a first extension tube extends from the outer side of the first opening. The outer side of the second auxiliary support plate is provided with a second opening, and a second extension tube extends from the second opening. The safety monitoring plate is slidably disposed in the first extension tube and the second extension tube respectively. The detection sensor is disposed in the cavity of the first extension tube and the second extension tube, and the detection end of the detection sensor points to the inner surface of the safety monitoring plate.

[0033] The technical effects achieved by this invention are as follows: When implementing foundation pit support in a confined space, the main support plate and the secondary support plate are hoisted into the foundation pit using equipment. A drive mechanism and a linkage mechanism connect the main support plate and the secondary support plate. After hoisting into the foundation pit, the main support plate and the secondary support plate are in a closed state. The linkage mechanism separates the secondary support plate from the main support plate, significantly increasing the support area for the inner wall of the foundation pit. The drive mechanism drives the main support plate closer to the inner wall of the foundation pit, achieving abutment support against the inner wall, thereby ensuring the reliability of the foundation pit support. This support system facilitates foundation pit support operations in confined spaces, reduces the construction difficulty of foundation pit construction, improves foundation pit construction efficiency, and facilitates subsequent support dismantling and other operations. Attached Figure Description

[0034] Figure 1 This is the front view of the foundation pit support structure;

[0035] Figure 2 This is a top view of the foundation pit support structure;

[0036] Figure 3 It is a plan view of the foundation pit support structure in use within the foundation pit;

[0037] Figure 4 This is a partial structural plan view of the anchor bracket and the supporting frame working together;

[0038] Figure 5 It is a structural plan view of the anchoring support, anchor rope and anchor rod assembly;

[0039] Figure 6 and Figure 7 These are schematic diagrams of the foundation pit support structure from two different perspectives.

[0040] Figure 8 and Figure 9 These are schematic diagrams of cross-sections of the foundation pit support structure from two different perspectives.

[0041] Figure 10 and Figure 11 This is a schematic diagram of the support structure from various perspectives;

[0042] Figure 12 and Figure 13 These are schematic diagrams of the main support plate, the secondary support plate, and the drive mechanism from two different perspectives.

[0043] Figure 14 It is a top view of the main support plate, the secondary support plate and the drive mechanism working together;

[0044] Figure 15 and Figure 16 These are schematic diagrams of the two viewpoint structures supporting the adjustment plate;

[0045] Figure 17 This is a schematic diagram of the structure in which the first and second support plates and the linkage mechanism work together.

[0046] Figure 18 It is a plan view of the first and second support plates and the linkage mechanism working together.

[0047] Figure 19 and Figure 20 These are schematic diagrams of the safety monitoring equipment installed on the first and second auxiliary support plates, respectively.

[0048] In the picture:

[0049] 100. Main support plate; 120. First inserted wedge block;

[0050] 200, Secondary support plate; 210, First secondary support plate; 21a, First opening; 21b, First extension tube; 211, Accommodation opening; 212, Sliding rail; 220, Second secondary support plate; 22a, Second opening; 22b, Second extension tube; 221, Sliding support plate; 230, First connecting rod; 240, Second connecting rod; 250, First support rod; 260, Second support rod; 270, Support rod; 280, Actuating rod; 290, Drive arm; 291, Drive cylinder; 292, Drive lever;

[0051] 300, Support base; 310, First base; 320, Second base; 330, First support rod; 340, Second support rod; 350, First support groove plate; 360, Second support groove plate; 370, Ball bearing; 380, Second insert wedge; 390, Fixed anchor bolt;

[0052] 400 Anchor rope; 410 Anchor bracket; 420 Pressure roller; 430 Anchor bolt; 440 Anchor tube;

[0053] 500, Anchor bolt; 510, Connecting pusher; 511, Connecting frame plate; 512, Connecting support arm; 513, Support guide tube; 514, Support spring; 515, Support pin; 5151, Support ball bearing; 520, Drive screw; 530, Drive nut; 531, Drive gear; 532, Power gear; 533, Hydraulic motor; 540, Support frame;

[0054] 600. Support adjustment plate; 610. Adjustment track; 620. Adjustment wheel; 630. Adjustment arm; 640. Adjustment cylinder;

[0055] 700. Safety monitoring equipment; 710. Safety monitoring board; 720. Detection sensor. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0057] It should be noted that in the description of this invention, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] Furthermore, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale; for example, the thickness or width of some layers may be exaggerated relative to other layers.

[0060] Example 1

[0061] The following is in conjunction with the appendix Figures 1 to 20 The foundation pit support structure of the present invention will be described in detail below:

[0062] like Figure 1-3As shown in the figure, this embodiment provides a structural diagram of a self-stabilizing, unsupported foundation pit support structure during its overall closure, deployment, and support on the foundation pit sidewall. The support structure of this embodiment includes a main support plate 100 and a secondary support plate 200. The main support plate 100 is connected to a driving mechanism, which drives the main support plate 100 to move horizontally and abut against or separate from the foundation pit sidewall. A secondary support plate 200 is provided on the main support plate 100. The secondary support plate 200 is connected to a linkage mechanism, which drives the secondary support plate 200 to merge or separate from the main support plate 100. When the secondary support plate 200 and the main support plate 100 are in the merged state, the secondary support plate 200 and the main support plate 100 form a single plate. When the secondary support plate 200 and the main support plate 100 are in the separated state, the secondary support plate 200 and the main support plate 100 are respectively used to abut against the foundation pit sidewall.

[0063] This support system is implemented by hoisting the main support plate 100 and the secondary support plate 200 into the pit during the construction of the confined space. A drive mechanism and a linkage mechanism connect the main support plate 100 and the secondary support plate 200. After hoisting into the pit, the main support plate 100 and the secondary support plate 200 are in a closed state. The linkage mechanism separates the secondary support plate 200 from the main support plate 100, significantly increasing the support area for the pit's inner wall. The drive mechanism moves the main support plate 100 closer to the pit's inner wall, providing a support against the inner wall and ensuring the reliability of the pit support. This support system facilitates pit support operations in confined spaces, reduces the difficulty of pit construction, improves pit construction efficiency, and facilitates subsequent support dismantling and other operations.

[0064] The secondary support plate 200 and the main support plate 100 can be configured in appropriate combinations according to the size of the foundation pit. The secondary support plate 200 and the main support plate 100 can be hoisted to the bottom of the foundation pit using hoisting equipment, and can be assembled on site for effective support.

[0065] When the above-mentioned equipment is hoisted to the bottom of the foundation pit, the main support plate 100 and the secondary support plate 200 can be unfolded or closed according to the actual use. The tightness of the connection between the main support plate 100 and the secondary support plate 200 and the inner wall of the foundation pit can be adjusted according to the condition of the foundation pit itself, thereby adjusting the support of the foundation pit.

[0066] As a preferred embodiment, the outer side of the main support plate 100 and the secondary support plate 200 that are connected to the foundation pit is generally arc-shaped, and the outer arc surfaces of the main support plate 100 and the secondary support plate 200 are arranged concentrically.

[0067] The outer arc surfaces of the main support plate 100 and the secondary support plate 200 are arranged concentrically. When the linkage mechanism unfolds the secondary support plate 200 and the main support plate 100, the secondary support plate 200 unfolds in a circle to increase the contact area with the inner wall of the pit, thereby providing reliable support for the pit. Depending on the actual use, the secondary support plate 200 and the main support plate 100 are arranged around the pit to complete the support of the inner wall of the pit. When the pit is dismantled after construction, the linkage mechanism causes the secondary support plate 200 and the main support plate 100 to close together. By activating the drive mechanism, the secondary support plate 200 and the main support plate 100 are moved away from the inner wall of the pit, completing the disassembly and assembly of the support. Disassembly is also more convenient.

[0068] Specifically, when driving the secondary support plate 200, the linkage mechanism drives the secondary support plate 200 to rotate around the center of the outer arc surface and to engage or disengage from the main support plate 100.

[0069] The main support plate 100 is mounted on the support base 300, which is installed at the bottom of the pit. One end of the support base 300 is connected to the anchor rope 400, which extends out of the pit opening and is connected to the anchor rod 500 on the outside of the pit.

[0070] Combination Figure 3 and Figure 5 To ensure the reliability of the deep foundation pit support, the support base 300 is placed at the bottom of the pit using hoisting equipment. Anchor ropes 400 are used to connect the support base 300 and extend beyond the pit opening, with one end of the anchor rope fixedly connected to the outer anchor rod 500 to anchor the main support plate 100. The secondary support plate 200 abuts against the inner wall of the pit, ensuring a reliable connection between the upper, lower, and side ends of the support base 300 and the pit. In the event of a collapse, the connection at the top and bottom, along with the side enclosure, effectively supports the collapse point, ensuring the safety of the foundation pit construction.

[0071] To ensure reliable support for the foundation pit and to effectively monitor any potential collapses, thereby ensuring construction safety, the main support plate 100 and the secondary support plate 200 are connected to a safety monitoring device 700. The safety monitoring device 700 is used to detect the expansion and contraction deformation of the main support plate 100 and the secondary support plate 200, and to adjust the bonding force between the drive mechanism and the main support plate 100 and the secondary support plate 200 and the sidewall of the foundation pit.

[0072] In this invention, a safety monitoring device 700 is installed to detect the expansion and contraction deformation of the main support plate 100 and the secondary support plate 200 in real time. When a collapse occurs in the foundation pit, the feedback data can be used to further reinforce the foundation pit support and ensure the reliability of the foundation pit support. During operation, the main support plate 100 and the secondary support plate 200 are driven by the drive mechanism to further abut against the foundation pit, which can ensure the initial support of the foundation pit. Furthermore, by detecting the collapse point, a pressure relief pit can be excavated to release the pressure at the collapse point of the foundation pit and ensure the safety of the foundation pit.

[0073] More preferably, such as Figure 1-2 and Figure 6-7 As shown, the secondary support plate 200 includes a first secondary support plate 210 and a second secondary support plate 220. The first secondary support plate 210 has an opening 211 for accommodating the main support plate 100. The inner side surfaces of the two side plates of the opening 211 are provided with sliding rails 212. The second secondary support plate 220 is provided with a sliding support plate 221, which is slidably mounted on the sliding rails 212.

[0074] To facilitate the deployment and closure of the secondary support plate 200 and the main support plate 100, the main support plate 100 is installed in the receiving opening 211 on the first secondary support plate 210, and the second secondary support plate 220 is slidably mounted on the sliding rail 212 via the sliding support plate 221. When the secondary support plate 200 and the main support plate 100 are deployed or closed, the sliding support plate 221 slides on the sliding rail 212, thereby facilitating the deployment and closure of the secondary support plate 200 and the main support plate 100.

[0075] Preferably, such as Figure 2 and Figure 12 As shown, when the main support plate 100 is driven horizontally, the main support plate 100 is brought closer to or further away from the inner wall of the pit. The driving mechanism includes a connecting push head 510 disposed on the inner side of the main support plate 100. The connecting push head 510 is connected to a drive screw 520. The drive screw 520 is arranged horizontally and cooperates with a drive nut 530. The drive nut 530 is rotatably disposed on the support frame 540. A power unit is used to drive the drive nut 530 to rotate.

[0076] By activating the power unit, the drive nut 530 is rotated, thereby driving the drive screw 520 to move horizontally, which in turn drives the main support plate 100 to move closer to or further away from the inner wall of the pit.

[0077] When driving the drive screw 520, one end of the drive nut 530 is installed at one end of the turntable of the thrust bearing. The drive nut 530 is installed on the drive gear 531. The drive gear 531 meshes with the power gear 532. The power gear 532 is connected to the output shaft of the hydraulic motor 533. The hydraulic motor 533 and the thrust bearing are installed on the support frame 540.

[0078] When implementing the rotational support for the drive nut 530, the drive nut 530 is supported by the thrust bearing. By starting the hydraulic motor 533, the rotation of the power gear 532 is activated, which in turn drives the drive gear 531, thereby driving the drive screw 520 so that the drive screw 520 is in a horizontal movement state, thereby driving or fine-tuning the main support plate 100.

[0079] More specifically, such as Figure 2 , Figure 8 and Figure 14 As shown, to connect the drive screw 520 to the main support plate 100, the connecting push head 510 includes a connecting frame plate 511. The inner side of the main support plate 100 is hinged to one end of a connecting arm 512. Two connecting arms 512 are provided, and the two connecting arms 512 are arranged in a figure-eight shape. The other end of the connecting arm 512 is hinged to the connecting frame plate 511. The hinge axes at both ends of the connecting arm 512 are arranged vertically. A support guide tube 513 is provided on the connecting frame plate 511. 13 is arranged horizontally and perpendicular to the inner side of the main support plate 100. A support spring 514 is provided inside the support conduit 513. A support pin 515 is provided inside the support spring 514. The support pin 515 is slidably disposed inside the support conduit 513. The two ends of the support spring 514 abut against one end of the support pin 515 and one end of the support conduit 513, respectively. A support ball 5151 is provided at one end of the support pin 515 extending out of the support conduit 513. The support ball 5151 abuts against the inner side of the main support plate 100.

[0080] Combination Figure 8 and Figure 9 When used to drive the main support plate 100 so that the main support plate 100 abuts against the inner wall of the pit, the support ball 5151 abuts against the inner side of the main support plate 100 and compresses the support spring 514 until the connecting arm 512 presses the entire main support plate 100, thereby achieving reliable abutment between the main support plate 100 and the inner wall of the pit and ensuring the reliability of the pit support.

[0081] To achieve reliable linkage between the first secondary support plate 210 and the second secondary support plate 220 in the secondary support plate 200 and the main support plate 100, the linkage mechanism includes a first connecting rod 230 disposed inside the first secondary support plate 210. One end of the first connecting rod 230 is hinged to the inner side plate of the first secondary support plate 210, and the other end of the first connecting rod 230 is hinged to the second connecting rod 240. The hinge axes at both ends of the first connecting rod 230 are vertical. The inner side of the second secondary support plate 220 is hinged to one end of the first support rod 250, and the other end of the first support rod 250 is hinged to the second support rod 260. The hinge axes at both ends of the first support rod 250 are vertical. The rod ends of the second connecting rod 240 and the second support rod 260 are respectively hinged to the support rod 270.

[0082] The aforementioned secondary support plate 200 is connected to the first secondary support plate 210 and the second secondary support plate 220. When the drive mechanism drives the main support plate 100 to move horizontally, the first secondary support plate 210 and the second secondary support plate 220 are linked to the first connecting rod 230 and the first support rod 250, which in turn are linked to the second connecting rod 240 and the second support rod 260. This unfolds the secondary support plate 200, the first secondary support plate 210, and the second secondary support plate 220 to bring them closer to the inner wall of the pit. When the support is completed or needs adjustment, the drive mechanism moves the main support plate 100 away from the pit, causing the first connecting rod 230 and the first support rod 250 to rotate and the second connecting rod 240 and the second support rod 260 to fold in, thereby driving the connecting rods.

[0083] More specifically, in order to enable the unfolding and folding of the first secondary support plate 210 and the second secondary support plate 220, the hinge ends of the second connecting rod 240 and the second bracket rod 260 and the support rod 270 are arranged coaxially, and the lower end of the support rod 270 is connected to the support base body 300.

[0084] Combination Figure 17 and Figure 18As shown, to enable the unfolding and folding of the first auxiliary support plate 210, the second auxiliary support plate 220, and the main support plate 100, two actuating rods 280 are vertically arranged in the area between the inner sides of the second connecting rod 240 and the second support rod 260. The two actuating rods 280 are respectively located at one end of the drive arm 290. One end of the drive arm 290 is connected to the piston rod of the drive cylinder 291. The piston rod of the drive cylinder 291 is arranged horizontally. The rods of the two actuating rods 280 abut against or separate from the inner sidewalls of the second connecting rod 240 and the second support rod 260, respectively. When the drive cylinder 291 drives the two actuating rods 280 closer to the cylinder body, the included angle between the second connecting rod 240 and the second support rod 260 is in a state of increasing. When the drive cylinder 291 drives the two actuating rods 280 away from the cylinder body, the included angle between the second connecting rod 240 and the second support rod 260 is in a state of decreasing.

[0085] When the first auxiliary support plate 210 and the second auxiliary support plate 220 are deployed to the main support plate 100, the drive cylinder 291 drives the two actuating rods 280 to move closer to the cylinder body, thereby increasing the angle between the second connecting rod 240 and the second support rod 260, which in turn causes the first auxiliary support plate 210 and the second auxiliary support plate 220 to be deployed to the main support plate 100. When the first auxiliary support plate 210 and the second auxiliary support plate 220 are closed to the main support plate 100, the drive cylinder 291 drives the two actuating rods 280 to move away from the cylinder body, thereby decreasing the angle between the second connecting rod 240 and the second support rod 260, which in turn causes the first auxiliary support plate 210 and the second auxiliary support plate 220 to be closed to the main support plate 100.

[0086] More preferably, when the first auxiliary support plate 210 and the second auxiliary support plate 220 are closed with the main support plate 100, the drive arm 290 is also provided with two drive levers 292. The two drive levers 292 are arranged vertically and are located in the area between the outer sides of the second connecting rod 240 and the second support rod 260. The bodies of the two drive levers 292 abut against or separate from the outer walls of the second connecting rod 240 and the second support rod 260, respectively. When the drive cylinder 291 drives the two drive levers 292 away from the cylinder body, the included angle between the second connecting rod 240 and the second support rod 260 is reduced, thereby making the first auxiliary support plate 210 and the second auxiliary support plate 220 close with the main support plate 100.

[0087] Preferably, in order to drive the drive arm 290, one end of the drive arm 290 is hinged to the drive slider 293, the hinge axis of the drive arm 290 is arranged vertically, and a stop bar 294 extends from the drive slider 293. The stop bar 294 is arranged vertically and its body abuts against or separates from the outside of the drive arm 290.

[0088] When the first auxiliary support plate 210 and the second auxiliary support plate 220 are closed with the main support plate 100, the stop bar 294 is arranged vertically and its body abuts against the outside of the drive arm 290. This causes the included angle between the second connecting rod 240 and the second support rod 260 to decrease, thus ensuring the closure of the first auxiliary support plate 210 and the second auxiliary support plate 220 with the main support plate 100.

[0089] More preferably, in order to implement further support and adjustment of the foundation pit wall and improve the flexibility of the support structure, a support adjustment plate 600 is hinged to one side of the first secondary support plate 210. The hinge axis of the support adjustment plate 600 is arranged vertically. A support angle adjustment unit is provided on the first secondary support plate 210. The support angle adjustment unit is used to adjust the included angle between the support adjustment plate 600 and the first secondary support plate 210.

[0090] Combination Figure 7 and Figure 15-16 To adjust the angle of the support adjustment plate 600, adjustment rails 610 are respectively provided at the upper and lower ends of the support adjustment plate 600. The support angle adjustment unit includes an adjustment wheel 620 disposed in the adjustment rail 610. The wheel core of the adjustment wheel 620 is arranged vertically. The adjustment wheel 620 is rotatably disposed at one end of the adjustment arm 630. The other end of the adjustment arm 630 is rotatably disposed on the first auxiliary support plate 210. The rotation axis of the adjustment arm 630 is vertical. The middle section of the adjustment arm 630 is hinged to the piston rod of the adjustment cylinder 640. The piston rod of the adjustment cylinder 640 is arranged horizontally.

[0091] The first secondary support plate 210 and the second secondary support plate 220 mentioned above are respectively provided with detachable maintenance baffles at the upper end of the main support plate 100, which facilitates hoisting and disassembly.

[0092] More preferably, such as Figure 1 As shown, the support base 300 includes a first base 310 and a second base 320. The lower end of the support rod 270 is fixed on the first base 310. The second base 320 and the first base 310 form a horizontal sliding fit. The lower ends of the first auxiliary support plate 210 and the second auxiliary support plate 220 are engaged with the second base 320.

[0093] Combination Figure 1 , Figure 10 and Figure 11The second base 320 and the first base 310 are in a horizontal sliding fit. The lower ends of the first auxiliary support plate 210 and the second auxiliary support plate 220 are in fit with the second base 320, so that when the first auxiliary support plate 210 and the second auxiliary support plate 220 are close to the pit sidewall, the first auxiliary support plate 210 and the second auxiliary support plate 220 can be reliably supported when they move.

[0094] like Figure 13 As shown, a first support rod 330 is provided at the lower end of the hinge shaft between the first auxiliary support plate 210 and the support adjustment plate 600, a second support rod 340 is provided at the lower end of the second auxiliary support plate 220, a first support groove plate 350 and a second support groove plate 360 ​​are provided on the second seat 320, the lower end of the first support rod 330 is connected to the first support groove plate 350, and the lower end of the second support rod 340 is connected to the second support groove plate 360.

[0095] like Figure 10 and Figure 11 As shown, to support the first secondary support plate 210 and the second secondary support plate 220, the sides and lower ends of the first support rod 330 and the second support rod 340 are provided with ball bearings 370. The first support groove plate 350 and the second support groove plate 360 ​​are generally strip-shaped. The ball bearings 370 abut against the bottom and walls of the groove of the first support groove plate 350 and the second support groove plate 360. One end of the first support groove plate 350 and the second support groove plate 360 ​​is hinged to the second seat 320 and the hinge axis is arranged vertically.

[0096] like Figure 3 As shown, in order to reliably connect the first secondary support plate 210, the second secondary support plate 220, and the main support plate 100 with the inner wall of the foundation pit, and to cooperate with the anchor bolts 500 and anchor ropes 400 mentioned above to form a stable and reliable force-bearing structure, so as to ensure reliable support for the foundation pit, a second inserted wedge block 380 is provided on one side of the first support groove plate 350 and the second support groove plate 360, and a first inserted wedge block 120 is arranged in an array on the outer side of the main support plate 100. Fixed anchor bolts 390 that are inserted into the bottom of the foundation pit are provided around the first base 310.

[0097] Preferably, an anchor bracket 410 is provided on the support frame 540 on the support base 300. One end of the anchor bracket 410 is hinged to the upper end of the support frame 540. One end of the wool rope 400 is connected to one end of the anchor bracket 410, and the other end of the anchor rope 400 is vertically downward and connected to the anchor rod 500.

[0098] like Figure 3 and Figure 4As shown, to connect the anchor rope 400 and the anchor rod 500, a pressure roller 420 is provided on the anchoring bracket 410. The center of the pressure roller 420 is horizontal, and the pressure roller 420 abuts against the upper end of the support frame 540. The anchor rope 400 includes two sets of anchor rope segments. One end of each set of anchor rope segments is connected to the anchoring bracket 410 and the anchor rod 500, respectively. The other end of each set of anchor rope segments is connected to the anchor bolt 430, and the two sets of anchor bolts 430 are respectively engaged with the two ends of the anchor tube 440.

[0099] like Figure 19 and Figure 20 As shown, in order to effectively detect the collapse of the foundation pit and thus ensure the adjustment of the entire support system, the safety monitoring device 700 includes a safety monitoring plate 710 disposed on the outer side of the first secondary support plate 210 and the second secondary support plate 220. The array of safety monitoring plates 710 is disposed on the outer side of the first secondary support plate 210 and the second secondary support plate 220. The array of safety monitoring plates 710 forms a sliding fit with the first secondary support plate 210 and the second secondary support plate 220. The sliding direction of the first secondary support plate 210 and the second secondary support plate 220 is perpendicular to the outer side of the first secondary support plate 210 and the second secondary support plate 220. A detection sensor 720 is disposed on the inner side of the safety monitoring plate 710. The detection sensor 720 is used to detect the displacement of the safety monitoring plate 710.

[0100] More preferably, in order to increase the contact area between the safety monitoring plate 710 and the soil foundation of the foundation pit, and to ensure that the safety monitoring plate 710 can be effectively displaced when the foundation pit collapses, the soil condition of the inner wall of the foundation pit can be obtained. Based on the collected data, the support of the foundation pit can be further strengthened. In addition, by excavating a pressure relief pit, the soil at the collapse location can be depressurized to ensure the safety of the entire construction.

[0101] Furthermore, such as Figure 1 , Figure 19 and Figure 20 As shown, the outer side of the first auxiliary support plate 210 is provided with a first opening 21a, and a first extension tube 21b extends from the outer side of the first opening 21a. The outer side of the second auxiliary support plate 220 is provided with a second opening 22a, and a second extension tube 22b extends from the second opening 22a. The safety monitoring plate 710 is slidably disposed in the first extension tube 21b and the second extension tube 22b respectively. The detection sensor 720 is disposed in the cavity of the first extension tube 21b and the second extension tube 22b, and the detection end of the detection sensor 720 points to the inner surface of the safety monitoring plate 710.

[0102] The above embodiments are only used to illustrate the technical methods 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 methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A self-stabilizing, internally unsupported foundation pit support structure, characterized in that: The system includes a main support plate (100) and a secondary support plate (200). The main support plate (100) is connected to a drive mechanism, which drives the main support plate (100) to move horizontally and abut against or separate from the side wall of the pit. The main support plate (100) is provided with a secondary support plate (200), which is connected to a linkage mechanism. The linkage mechanism drives the secondary support plate (200) to merge or separate from the main support plate (100). When the secondary support plate (200) and the main support plate (100) are in the merged state, the secondary support plate (200) and the main support plate (100) form a whole plate. When the secondary support plate (200) and the main support plate (100) are in the separated state, the main support plate (100) and the secondary support plate (200) abut against the side wall of the pit for support. The drive mechanism includes a connecting push head (510), a drive screw (520), a drive nut (530), and a hydraulic motor (533). The connecting push head (510) is located on the side of the main support plate (100) away from the pit sidewall, and the connecting push head (510) is connected to the drive screw (520). The drive screw (520) is horizontally arranged and cooperates with the drive nut (530). One end of the drive nut (530) is rotatably mounted on the support frame (540) through a thrust bearing, and the other end is equipped with a drive gear (531). The drive gear (531) meshes with the power gear (532), the power gear (532) is connected to the output shaft of the hydraulic motor (533), and the hydraulic motor (533) is mounted on the support frame (540); It also includes a connecting arm (512), the connecting push head (510) includes a connecting frame plate (511), the main support plate (100) is hinged to one end of the connecting arm (512); the connecting arm (512) is provided in two sets, and the two sets of connecting arms (512) are arranged in a figure-eight shape. The other end of the connecting arm (512) is hinged to the connecting frame plate (511) respectively, and the hinge shafts at both ends of the connecting arm (512) are arranged vertically; A support conduit (513) is provided on the connecting frame plate (511). The support conduit (513) is horizontal and arranged perpendicular to the inner side of the main support plate (100). A support spring (514) is provided inside the support conduit (513). A support pin (515) is provided inside the support spring (514). The support pin (515) is slidably disposed inside the support conduit (513). The two ends of the support spring (514) abut against one end of the support pin (515) and one end of the support conduit (513), respectively. A support ball (5151) is provided at one end of the support pin (515) extending out of the support conduit (513). The support ball (5151) abuts against the inner side of the main support plate (100).

2. The foundation pit support structure according to claim 1, characterized in that: The main support plate (100) and the secondary support plate (200) are in the shape of an arc plate on the outer side of the foundation pit, and the outer arc surfaces of the main support plate (100) and the secondary support plate (200) are arranged concentrically; the linkage mechanism drives the secondary support plate (200) to rotate around the center of the outer arc surface and to engage or separate from the main support plate (100).

3. The foundation pit support structure according to claim 1, characterized in that: It also includes a support base (300) and a safety monitoring device. The support base (300) is installed at the bottom of the pit and extends out of the pit opening through an anchor rope (400) and is connected to an anchor rod (500) on the outside of the pit. The main support plate (100) is set on the support base (300). The main support plate (100) and the secondary support plate (200) are connected to the safety monitoring device. The safety monitoring device is used to detect the expansion and contraction deformation of the main support plate (100) and the secondary support plate (200) and to adjust the drive mechanism to drive the main support plate (100) and the secondary support plate (200) to the pit sidewall with a certain degree of force.

4. The foundation pit support structure according to any one of claims 1-3, characterized in that: The secondary support plate (200) includes a first secondary support plate (210) and a second secondary support plate (220). The first secondary support plate (210) has an opening (211) for accommodating the main support plate (100), and a sliding rail (212) is provided on the first secondary support plate (210). The second secondary support plate (220) has a sliding support plate (221) which is slidably disposed on the sliding rail (212).

5. The foundation pit support structure according to claim 4, characterized in that: The linkage mechanism includes a first connecting rod (230) disposed inside the first secondary support plate (210), one end of the first connecting rod (230) is hinged to the inner side plate of the first secondary support plate (210), and the other end of the first connecting rod (230) is hinged to the second connecting rod (240), with the hinge shafts at both ends of the first connecting rod (230) being vertical; the inner side of the second secondary support plate (220) is hinged to one end of the first support rod (250), and the other end of the first support rod (250) is hinged to the second support rod (260), with the hinge shafts at both ends of the first support rod (250) being vertical; the rod ends of the second connecting rod (240) and the second support rod (260) are respectively hinged to the support rod (270); The hinge ends of the second connecting rod (240) and the second support rod (260) are arranged coaxially with the support rod (270), and the lower end of the support rod (270) is connected to the support base body (300). Two actuating rods (280) are vertically arranged in the area between the inner sides of the second connecting rod (240) and the second support rod (260). The two actuating rods (280) are located at one end of the drive arm (290), and the other end of the drive arm (290) is connected to the piston rod of the drive cylinder (291). The rod bodies of the two actuating rods (280) respectively abut against or separate from the inner sidewalls of the second connecting rod (240) and the second support rod (260). The drive arm (290) is also provided with two drive levers (292). The two drive levers (292) are arranged vertically and are located in the area between the outer side of the second connecting rod (240) and the second support rod (260). The body of the drive lever (292) abuts against or separates from the outer side wall of the second connecting rod (240) and the second support rod (260), respectively. The drive arm (290) is also hinged to the drive slider (293). The hinge axis of the drive arm (290) is arranged vertically. A stop bar (294) extends from the drive slider (293). The stop bar (294) is arranged vertically and its body abuts against or separates from the outside of the drive arm (290).

6. The foundation pit support structure according to claim 4, characterized in that: A support adjustment plate (600) is hinged to one side of the first secondary support plate (210). The hinge axis of the support adjustment plate (600) is arranged vertically. A support angle adjustment unit is provided on the first secondary support plate (210). The support angle adjustment unit is used to adjust the included angle between the support adjustment plate (600) and the first secondary support plate (210).

7. The foundation pit support structure according to claim 6, characterized in that: The upper and lower ends of the support adjustment plate (600) are respectively provided with adjustment rails (610). The support angle adjustment unit includes an adjustment wheel (620) set in the adjustment rail (610). The wheel core of the adjustment wheel (620) is arranged vertically. The adjustment wheel (620) is rotatably set at one end of the adjustment arm (630), and the other end of the adjustment arm (630) is rotatably set on the first auxiliary support plate (210). The rotation axis of the adjustment arm (630) is vertical. The middle section of the adjustment arm (630) is hinged to the piston rod of the adjustment cylinder (640). The piston rod of the adjustment cylinder (640) is arranged horizontally.

8. The foundation pit support structure according to claim 6, characterized in that: Maintenance baffles can be detachably installed on the upper ends of the first secondary support plate (210), the second secondary support plate (220), and the main support plate (100) to facilitate hoisting.

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