Adjustable foundation pit steel inclined strut device

Abstract

The utility model belongs to the technical field of foundation pit construction, and particularly relates to an adjustable foundation pit steel inclined strut device. Comprising a supporting plate arranged on the side wall of a foundation pit and an inclined strut body playing a supporting role, and the inclined strut body is connected with the bottom wall of the foundation pit through a bottom support assembly. The bottom support assembly comprises a sliding bottom support plate, a sliding groove perpendicular to the inclined strut body is formed in the side, close to the bottom wall of the foundation pit, of the sliding bottom support plate, and the bottom support assembly further comprises a boss which is fixedly arranged on the bottom wall of the foundation pit and can be embedded into the sliding groove, so that the sliding bottom support plate is in sliding connection with the boss. The side, away from the bottom wall of the foundation pit, of the sliding bottom supporting plate is further provided with two or more clamping grooves capable of being connected with the inclined strut body in a clamped mode. Through the arrangement of the bottom support assembly, the transverse and longitudinal position adjustment of the steel inclined strut can be achieved, and various construction working conditions are met. And by arranging a detachable structure, the steel inclined strut replacement operation is facilitated, an original time-consuming and complex construction scheme is simplified, the overall construction efficiency is improved, and application and popularization in production practice are facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of foundation pit construction technology, specifically relating to an adjustable foundation pit steel bracing device. Background Technology

[0002] Excavation pit support is essential for ensuring the stability of the soil surrounding the pit and meeting the necessary conditions for underground construction. When the pit is deep, internal bracing can be used within the pit. Steel bracing, as an important internal bracing technology, has extremely wide applications. Whether in high-rise buildings, large commercial complexes, or industrial plants, steel bracing plays an indispensable role. Traditional steel bracing methods mainly revolve around internal steel bracing and bottom diagonal bracing. During excavation, internal steel bracing provides lateral support to the retaining structure to resist pressure from the soil outside the pit, groundwater pressure, and other loads that may be generated during construction. Its function is to effectively control pit deformation, ensure pit stability, and thus ensure construction safety within the pit and the safety of the surrounding environment.

[0003] Throughout the underground construction process, steel supports continuously transmit water and soil pressure to the retaining structure. When the pressure on the outside of the retaining structure changes, the steel supports may not be properly positioned, leading to cracks and water seepage in the retaining structure. Adjustments to the angle and position of the steel supports are necessary to compensate for these changes in external pressure. Furthermore, as the project progresses, the presence of steel supports can cause inconvenience during construction, necessitating their removal or relocation. Both of these situations require adjustments to the position of the steel supports. Traditional steel bracing typically uses bolted or welded connections to embedded plates and support plates, making removal and movement extremely difficult. Even minor adjustments often require the complete dismantling of the entire steel bracing structure.

[0004] To address the aforementioned problems, a quick-release support structure for deep foundation pits, as disclosed in patent 202321420773.6, uses two sets of slide rails respectively mounted on the side and bottom walls of the foundation pit. Both ends of the main load-bearing diagonal brace are hinged with sliders, which slide onto the slide rails. Positioning bolts are used to fix the diagonal brace at different angles. However, this solution includes a base plate and support plate fixed to the side and bottom walls of the foundation pit, and the two sets of slide rails are also fixed to the base plate and support plate respectively. Therefore, the horizontal movement of the diagonal brace is limited. Adjusting the horizontal position of the steel diagonal brace to compensate for changes in external pressure remains extremely difficult. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of existing technologies where it is difficult to change the support position after the steel support is installed to compensate for changes in the stress on the foundation pit retaining structure. It provides an adjustable foundation pit steel diagonal bracing device to overcome the above-mentioned shortcomings.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] An adjustable steel bracing device for foundation pits, comprising:

[0008] The support plate is installed on the side wall of the foundation pit, and the diagonal brace body plays a supporting role between the support plate and the bottom wall of the foundation pit. The diagonal brace body is connected to the bottom wall of the foundation pit through a bottom support assembly.

[0009] The base support assembly includes a sliding base plate, which has a sliding groove perpendicular to the diagonal brace body on the side near the bottom wall of the pit, and also includes a boss fixed to the bottom wall of the pit that can be embedded in the sliding groove, so that the sliding base plate and the boss are slidably connected.

[0010] The sliding base plate is also provided with two or more slots on the side away from the bottom wall of the pit, which can be engaged with the main body of the diagonal brace.

[0011] The internal support structure of foundation pit retaining walls often requires adjustment in two situations: first, when external pressure changes and the support plate partially deforms, the position of the internal support needs to be adjusted to prevent further deformation of the support plate; second, as the project progresses, the original internal support occupies construction space, requiring adjustment of the internal support's position. Therefore, this utility model designs a bottom support assembly at the connection between the steel diagonal brace and the bottom wall of the foundation pit, capable of driving the diagonal brace body to move bidirectionally. The protrusion is an embedded part installed at a predetermined position within the foundation pit. In practice, the bottom can be sealed with concrete at the predetermined position first, and then the protrusion can be embedded within it, with a portion exposed above the concrete surface. The main body of the bottom support assembly is a sliding bottom support plate, with a horizontal groove at its bottom that allows the protrusion to move relative to it. The lateral movement of the sliding bottom support plate drives the movement of the diagonal brace body. A series of slots are set perpendicular to the bottom groove at the top of the sliding bottom support plate. By engaging the diagonal brace body with different slots, the longitudinal movement of the diagonal brace body is achieved, thereby changing the support angle of the diagonal brace body. The cooperation between the sliding groove and the slot enables the diagonal brace to move in both the horizontal and vertical directions.

[0012] Furthermore, the main body of the diagonal brace is equipped with an adjustment device that can adjust the supporting force of the diagonal brace. Due to the change in the position of the diagonal brace, the required supporting force of the diagonal brace will inevitably change in order to withstand the pressure of the support plates at different positions. Therefore, a supporting force adjustment device needs to be set on the diagonal brace. In practice, a turnbuckle can be set at the tail of the diagonal brace, and the force on the diagonal brace can be adjusted by rotating the bolt. Alternatively, a hydraulic jack can be set in the middle of the diagonal brace, and the output pressure of the jack can be changed by hydraulic pressure.

[0013] As a further preferred embodiment, the adjusting device is an axial force servo system that adjusts the support force by monitoring the deformation of the support plate. The axial force servo system is an advanced foundation pit support construction technology with numerous applications. It features automatic control, real-time monitoring, and automatic compensation, integrating computer information and automated monitoring systems, wireless communication transmission, and other technologies. Based on the actual monitored deformation of the support plate, it continuously controls the magnitude of the support axial force through computer control. Applying this technology to adjustable steel supports simplifies the frequent manual adjustments required due to changes in the position and angle of the steel supports.

[0014] As a preferred embodiment, a connecting plate with an overlapping groove is fixedly connected to the support plate. The connecting plate is a steel plate welded or bolted to the support plate, and a transverse elongated overlapping groove is provided below the connecting plate, so that one end of the diagonal brace body can move laterally within the overlapping groove, thereby cooperating with the adjustment of the bottom support assembly at the other end of the diagonal brace body.

[0015] As a further preferred embodiment, the main body of the diagonal brace is equipped with detachable steel supports at both ends. As the project progresses, the steel diagonal brace occupies space in the planned structure, and minor adjustments are no longer sufficient. At this point, a replacement operation is required, i.e., the original support structure is removed, and the pressure of the support plate is transferred to the completed structure through a newly installed device. The detachable steel supports at both ends of the diagonal brace facilitate the removal process, and by using steel supports with a diameter larger than the main body of the diagonal brace, the load-bearing capacity is also increased.

[0016] As a further preferred embodiment, the steel support at one end of the diagonal brace body overlaps with the connecting plate to fit tightly against the support plate, and the steel support at the other end is provided with a locking component on the side that contacts the slot, so that the steel support is locked into the slot.

[0017] Preferably, the diagonal brace body has locking blocks at both ends that can pop out, and the steel support has a receiving groove to accommodate the elastic locking blocks. The diagonal brace body also has receiving spaces at both ends that can fully retract the locking blocks. To achieve a detachable connection, slots are pre-cut at the points where the diagonal brace body combines with the steel support to serve as receiving spaces. Springs or other elastic components are installed in these spaces, and the locking blocks are then fixed to these elastic components. This allows the locking blocks to fully enter the receiving spaces when the elastic components are pressed, and to pop out of the diagonal brace body and into the receiving grooves of the steel support when the elastic components are released.

[0018] Preferably, the boss is fixed to the bottom wall of the foundation pit by means of engineering piles pre-embedded in the bottom wall of the foundation pit.

[0019] As a further preferred embodiment, the boss is provided with an insertion hole for insertion into the exposed reinforcing bars of the engineering pile. This insertion method facilitates the fixing of the boss, and compared to welding, it allows for quicker removal of the boss when the steel bracing needs to be disassembled.

[0020] Therefore, this utility model has the following beneficial effects:

[0021] (1) By setting the bottom support component, this utility model can realize the horizontal and vertical position adjustment of the steel diagonal brace while ensuring the supporting force. By changing the support angle and position, the steel diagonal brace can meet various construction conditions.

[0022] (2) The present invention uses a servo system with a preferred scheme to continuously monitor the working condition of the retaining structure and provide compensation support while the position of the steel diagonal brace changes, thus ensuring the safety of construction.

[0023] (3) This utility model has a detachable structure, which facilitates the replacement of supports, simplifies the original time-consuming and complicated construction plan, improves the overall construction efficiency, and is conducive to its promotion and application in production practice. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the connection of the adjustable foundation pit steel diagonal bracing device of this utility model.

[0025] Figure 2 This is a schematic diagram of the base support assembly structure of this utility model.

[0026] Figure 3 This is a schematic diagram showing the connection between the base support assembly and the steel support of this utility model.

[0027] Figure 4 This is a schematic diagram showing the connection between the connecting plate and the steel support of this utility model.

[0028] Figure 5 This is a schematic diagram of the diagonal brace body and locking block of this utility model.

[0029] Figure 6 This is a schematic diagram of the connecting plate according to an embodiment of the present utility model.

[0030] Figure 7 This is a schematic diagram of the boss in an embodiment of the present utility model.

[0031] In the figure: support plate 1; diagonal brace body 2; adjustment device 3; connecting plate 4; locking block 5; accommodating space 6; engineering pile 7; insertion hole 8; bottom support assembly 10; sliding bottom support plate 11; sliding groove 12; boss 13; slot 14; overlapping groove 15; steel support 20; positioning piece 21; accommodating groove 22. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0033] Example:

[0034] like Figure 1-7 As shown, a retaining plate 1 for retaining soil is pre-installed on the side wall of the foundation pit. The main body of the adjustable foundation pit steel diagonal bracing device in this embodiment is a tubular diagonal bracing body 2. The diagonal bracing body 2 is erected between the retaining plate 1 and the bottom wall of the foundation pit, forming a triangular structure. A bidirectional axial force servo system is provided in the middle of the diagonal bracing body 2 as an adjustment device 3 for adjusting the supporting force of the diagonal bracing body 2. The adjustment device 3 actively controls the supporting axial force to balance the external soil pressure of the retaining plate 1, thereby achieving the effect of controlling the deformation of the retaining plate 1. A pair of locking mechanisms are respectively set at both ends of the diagonal bracing body. Four receiving spaces 6 are pre-cut at both ends of the diagonal bracing body, and springs are welded in them. Locking blocks 5 are then welded on the springs. When the springs are compressed, the locking blocks 5 can be fully inserted into the receiving spaces 6. Through the above-mentioned locking mechanisms, steel supports 20 that can accommodate the ends of the diagonal bracing body 2 are installed at both ends of the diagonal bracing body. Each steel support 20 also has two receiving slots 22 that can accommodate the locking blocks 5. The locking block 5 has a piece cut off on the side away from the steel support 20 to form a slope, so that the side of the locking block 5 forms a triangle. Therefore, when the steel support 20 is connected to the diagonal support body 2, the locking block 5 needs to be manually pressed into the receiving space 6. When separating the steel support 20 from the diagonal support body 2, the diagonal support body 2 can be pulled out directly, and the locking block 5 will automatically press into the receiving space 6 through the slope, so as to achieve quick disassembly.

[0035] The connection methods between the diagonal brace body 2 and the support plate 1 and the bottom wall of the pit are different. On the side where the support plate 1 connects to the diagonal brace body 2, for example... Figure 4 As shown, the following are pre-welded onto the support plate 1: Figure 6 The connecting plate 4 is such that the protruding part of the steel support 20 on this side can precisely overlap the overlapping groove 15 of the connecting plate 4, thereby ensuring that the steel support 20 at this end is tightly attached to the connecting plate 4 and allows the steel support 20 to slide within the overlapping groove 15. On the side where the diagonal brace body 2 contacts the bottom wall of the foundation pit, such as Figure 3 As shown, Figure 7 A ring of insertion holes 8 is provided on the boss 13, allowing the exposed reinforcing bars of the pre-embedded engineering pile 7 to be inserted into the insertion holes 8. Connected to the boss 13 is the base support assembly 10, the main component of this invention capable of position adjustment, such as... Figure 2 As shown, it is a single sliding base plate 11 with a horizontal groove 12 on its bottom, so that the boss 13 can be inserted into the groove 12 and the sliding base plate 11 can move laterally along the direction of the groove 12; five slots 14 are provided on the top of the sliding base plate 11 in a direction perpendicular to the groove 12, and three locking parts 21 are welded to the bottom of the steel support 20 on this side, so that the steel support 20 can be selected to be inserted into different slots 14 to realize the longitudinal movement of the diagonal brace body 2.

[0036] The implementation method of this embodiment is as follows:

[0037] When installing the steel diagonal brace of this embodiment: First, weld the connecting plate 4 to the location where the support plate 1 needs support, and pre-embed the engineering pile 7 at the bottom of the foundation pit at the corresponding location. Insert the exposed reinforcing bars of the engineering pile 7 into the insertion hole 8 of the boss 13. Then, snap the boss 13 into the sliding groove 12 of the sliding base plate 11 to complete the installation of the steel support foundation. Press the locking blocks 5 at both ends of the diagonal brace body 2 into the receiving space 6, and then snap the steel support 20 into both ends of the diagonal brace body 2. Snap the locking piece 21 of the steel support 20 located at the bottom of the diagonal brace body 2 into the appropriate slot 14, and then overlap the steel support 20 located at the top of the diagonal brace body 2 onto the connecting plate 4 to complete the installation of the steel diagonal brace of this embodiment.

[0038] When using the steel diagonal brace of this embodiment: if deformation is found in the unsupported position of the support plate 1, the support position of the steel diagonal brace needs to be adjusted. First, slide the bottom support plate 11 to the position that needs support through the sliding groove 12. The steel support 20, which is in close contact with the connecting plate 4, slides in the overlapping groove 15. Then, by adjusting the locking piece 21, it is locked into different slots 14 to realize the change of support angle and position. At this time, the adjustment device 3 outputs different support forces to compensate for the changes in support position and the pressure borne by the support plate 1.

[0039] When dismantling the steel diagonal brace of this embodiment: First, remove the steel support 20 at the upper end of the diagonal brace body 2 from the connecting plate 4. Then, separate the steel support 20 from the diagonal brace body 2. As the diagonal brace body 2 and the steel support 20 move relative to each other, the slope on the locking block 5 presses against the edge of the receiving groove 22, causing the locking block 5 to be automatically pressed into the receiving space 6, thus allowing the diagonal brace body 2 to separate smoothly from the steel support 20. Then, remove the sliding bottom plate 11 and the boss 13 in sequence to complete the dismantling of the steel diagonal brace of this embodiment.

Claims

1. An adjustable steel bracing device for foundation pits, characterized in that: It includes a support plate (1) installed on the side wall of the pit, and a diagonal brace body (2) that provides support between the support plate (1) and the bottom wall of the pit. The diagonal brace body (2) is connected to the bottom wall of the pit through a bottom support assembly (10). The bottom support assembly (10) includes a sliding bottom support plate (11), which has a groove (12) perpendicular to the inclined support body (2) on the side near the bottom wall of the pit, and also includes a boss (13) fixed to the bottom wall of the pit and embedded in the groove (12), so that the sliding bottom support plate (11) and the boss (13) are slidably connected. The sliding base plate (11) is provided with two or more slots (14) on the side away from the bottom wall of the pit, which can be engaged with the main body of the diagonal brace (2).

2. The adjustable foundation pit steel bracing device according to claim 1, characterized in that: The diagonal brace body (2) is provided with an adjustment device (3) that can adjust the supporting force of the diagonal brace body (2).

3. The adjustable foundation pit steel bracing device according to claim 2, characterized in that: The adjustment device (3) is an axial force servo system that adjusts the support force by monitoring the condition of the support plate (1).

4. The adjustable foundation pit steel bracing device according to claim 1, characterized in that: A connecting plate (4) with an overlap groove (15) is fixedly connected to the support plate (1).

5. An adjustable foundation pit steel bracing device according to claim 4, characterized in that: The diagonal brace body (2) is provided with steel supports (20) at both ends.

6. An adjustable foundation pit steel bracing device according to claim 5, characterized in that: The steel support (20) at one end of the diagonal brace body (2) is closely fitted to the support plate (1) by overlapping with the connecting plate (4). The steel support (20) at the other end is provided with a locking member (21) on the side that contacts the slot (14), so that the steel support (20) and the slot (14) are locked together.

7. An adjustable foundation pit steel bracing device according to claim 5, characterized in that: The diagonal brace body (2) has locking blocks (5) that can pop out at both ends. The steel support (20) has a receiving groove (22) that can accommodate the locking blocks (5). The diagonal brace body (2) has receiving spaces (6) at both ends that can completely retract the locking blocks (5).

8. An adjustable foundation pit steel bracing device according to claim 7, characterized in that: The locking block (5) has a ramp on the side away from the steel support (20).

9. An adjustable foundation pit steel bracing device according to claim 1, characterized in that: The boss (13) is fixed to the bottom wall of the foundation pit by means of an engineering pile (7) pre-embedded in the bottom wall of the foundation pit.

10. An adjustable foundation pit steel bracing device according to claim 9, characterized in that: The boss (13) is provided with an insertion hole (8) that can be inserted into the exposed steel bar of the engineering pile (7).

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