Assembly type foundation pit supporting adjustable angle brace

Abstract

When the adjustable angle brace for the assembly type foundation pit support is used, the left fixing piece is arranged in front of a transverse enclosing purlin of the assembly type foundation pit support and installed on the transverse enclosing purlin, and the right fixing piece is arranged on the left side of a longitudinal enclosing purlin of the assembly type foundation pit support and installed on the longitudinal enclosing purlin. The degree of inserting the left end of the right angle supporting rod into the sliding groove in the inclined direction of the left angle supporting rod is adjusted (if the jack bin exists, the jack can be placed into the jack bin and loaded for auxiliary adjustment), namely the length of the assembly of the left angle supporting rod and the right angle supporting rod is adjusted to reach the designed distance, and the design distance is adjusted. And a proper number of limiting rods are inserted into the limiting holes (if the jack is used, the jack is unloaded and removed). The device is adjustable in length, can be suitable for foundation pits with different sizes, is convenient and flexible to use, improves the construction efficiency, and reduces the construction cost.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support technology, and particularly to the field of foundation pit support corner brace technology, specifically referring to a prefabricated adjustable corner brace for foundation pit support. Background Technology

[0002] An excavation pit is a space excavated downwards from the ground for the construction of the underground portion of a building or structure. Excavation pit support consists of retaining walls, waterproof curtains, walers, supports (anchors), and columns (piles), and is a crucial structure for protecting the underground main structure and the safety of the surrounding environment. Horizontal supports can be planar structures composed of bracing, corner bracing, etc., and the support structure can use steel supports, reinforced concrete supports, or a combination of steel and reinforced concrete supports.

[0003] Prefabricated construction technology is a building construction method. Its main feature is that components are prefabricated in a factory and then transported to the construction site for assembly. This can improve construction efficiency, reduce on-site construction time and labor costs, have a small impact on the environment, and also help improve the controllability and consistency of building (structure) quality, and strengthen the informatization and greening of civil engineering construction.

[0004] Prefabricated foundation pit support consists of retaining walls such as steel sheet piles and horizontal supports such as steel bracing and steel corner bracing. The support structure is reliable, reusable and recyclable, requires less masonry, reduces environmental pollution, improves construction efficiency and safety, and has a low overall cost.

[0005] However, the existing corner bracing has a fixed length and cannot be adjusted, so different lengths of corner bracing are often required for foundation pits of different sizes.

[0006] Therefore, it is desirable to provide a prefabricated adjustable corner brace for foundation pit support, which has an adjustable length and can be applied to foundation pits of different sizes. It is convenient and flexible to use, improves construction efficiency, and reduces construction costs. Utility Model Content

[0007] In order to overcome the shortcomings of the prior art, one objective of this utility model is to provide an adjustable angle brace for prefabricated foundation pit support, the length of which is adjustable and applicable to foundation pits of different sizes. It is convenient and flexible to use, improves construction efficiency, reduces construction costs, and is suitable for large-scale promotion and application.

[0008] Another objective of this invention is to provide an adjustable prefabricated foundation pit support brace, which is ingeniously designed, has a simple structure, is easy to manufacture, has low manufacturing cost, and is suitable for large-scale promotion and application.

[0009] To achieve the above objectives, this utility model provides a prefabricated adjustable corner brace for foundation pit support, characterized by comprising a left fixing member, a right fixing member, a left corner brace rod, a right corner brace rod, and a limiting rod, wherein:

[0010] The left fixing member is used to be located in front of the transverse waler of the prefabricated foundation pit support and installed on the transverse waler. The right fixing member is located to the right front of the left fixing member and is used to be located to the left of the longitudinal waler of the prefabricated foundation pit support and installed on the longitudinal waler.

[0011] The left corner brace is horizontally positioned and inclined to the right front in a direction from left to right. The left end of the left corner brace is located in front of the left fixing member and is horizontally rotatably connected to the left fixing member. The right end of the left corner brace is provided with a sliding groove along the inclined direction of the left corner brace. The right corner brace is horizontally positioned and along the inclined direction of the left corner brace. The right end of the right corner brace is located to the left of the right fixing member and is horizontally rotatably connected to the right fixing member. The left end of the right corner brace is movably inserted into the sliding groove along the inclined direction of the left corner brace.

[0012] The top of the left corner support rod is provided with a limiting hole along the inclined direction of the left corner support rod. The limiting hole is connected to the sliding groove. The limiting rod is vertically arranged and vertically inserted into the limiting hole and is movable along the inclined direction of the left corner support rod. There are multiple limiting rods, which are arranged in sequence along the inclined direction of the left corner support rod. The leftmost limiting rod abuts against the left end of the limiting hole, and the rightmost limiting rod abuts against the left end of the right corner support rod.

[0013] Preferably, the left fixing member is a left fixing plate, which is vertically arranged and positioned along the left-right direction.

[0014] More preferably, the prefabricated pit support adjustable angle brace also includes a left fixing bolt, the left fixing bolt is arranged in the front-rear direction, the front end of the left fixing bolt is located in front of the left fixing plate and abuts against the left fixing plate, and the rear end of the left fixing bolt passes through the left fixing plate in the front-rear direction and is used to pass through and threadedly engage the transverse waler.

[0015] More preferably, the prefabricated adjustable corner brace for foundation pit support further includes a first upper left ear plate, a first lower left ear plate, a second upper left ear plate, a second lower left ear plate, and a left pin. The first upper left ear plate and the first lower left ear plate are both horizontally arranged and spaced apart vertically. The first upper left ear plate and the first lower left ear plate are both located in front of the left fixed plate and are both connected to the left fixed plate. The second upper left ear plate and the second lower left ear plate are both horizontally arranged and spaced apart vertically. The second upper left ear plate and the second lower left ear plate are both located at the left corner. The left end of the support rod is located to the left rear and is connected to the left end of the left corner support rod. The first upper left ear plate and the first lower left ear plate are located between the second upper left ear plate and the second lower left ear plate and respectively abut against the second upper left ear plate and the second lower left ear plate. The left pin is vertically arranged and passes through the second upper left ear plate, the first upper left ear plate, the first lower left ear plate and the second lower left ear plate, and is horizontally rotatable relative to the second upper left ear plate, the first upper left ear plate, the first lower left ear plate and the second lower left ear plate.

[0016] Preferably, the right fixing member is a right fixing plate, which is vertically arranged and arranged along the front-to-back direction.

[0017] More preferably, the prefabricated adjustable corner brace for foundation pit support also includes a right fixing bolt, which is arranged in the left-right direction. The left end of the right fixing bolt is located on the left side of the right fixing plate and abuts against the right fixing plate. The right end of the right fixing bolt passes through the right fixing plate in the left-right direction and is used for threading and engaging the longitudinal waler.

[0018] More preferably, the prefabricated adjustable corner brace for foundation pit support further includes a first upper right ear plate, a first lower right ear plate, a second upper right ear plate, a second lower right ear plate, and a right pin. The first upper right ear plate and the first lower right ear plate are both horizontally arranged and spaced apart vertically. The first upper right ear plate and the first lower right ear plate are both located to the left of the right fixed plate and are both connected to the right fixed plate. The second upper right ear plate and the second lower right ear plate are both horizontally arranged and spaced apart vertically. The second upper right ear plate and the second lower right ear plate are both located at the right corner. The right front of the right end of the strut is connected to the right end of the right corner strut. The first upper right ear plate and the first lower right ear plate are located between the second upper right ear plate and the second lower right ear plate and abut against the second upper right ear plate and the second lower right ear plate, respectively. The right pin is vertically arranged and passes through the second upper right ear plate, the first upper right ear plate, the first lower right ear plate and the second lower right ear plate, and is horizontally rotatable relative to the second upper right ear plate, the first upper right ear plate, the first lower right ear plate and the second lower right ear plate.

[0019] Preferably, the front side of the left corner brace is provided with a left groove along the inclined direction of the left corner brace, and the front side of the right corner brace is provided with a right groove along the inclined direction of the left corner brace. The right end of the left groove and the left end of the right groove are both open and interconnected, thereby forming a jack chamber between the left groove and the right groove.

[0020] Preferably, the number of limiting rods is three.

[0021] Preferably, the limiting rod is a T-shaped rod.

[0022] Preferably, the sliding groove is an I-shaped groove, and the left end of the right corner support is an I-shaped end.

[0023] The main beneficial effects of this utility model are as follows:

[0024] 1. When using the adjustable corner brace of the prefabricated foundation pit support of this utility model, place the left fixing part in front of the transverse waler of the prefabricated foundation pit support and install it on the transverse waler. Place the right fixing part on the left side of the longitudinal waler of the prefabricated foundation pit support and install it on the longitudinal waler. Adjust the degree to which the left end of the right corner brace is inserted into the sliding groove along the inclination direction of the left corner brace (if a jack compartment exists, the jack can be placed in the jack compartment and loaded for auxiliary adjustment). That is, adjust the length of the components of the left and right corner braces to achieve the design distance. Insert an appropriate number of limiting rods into the limiting holes (if a jack is used, unload and remove the jack). Therefore, its length is adjustable, applicable to foundation pits of different sizes, convenient and flexible to use, improves construction efficiency, reduces construction costs, and is suitable for large-scale promotion and application.

[0025] 2. When using the adjustable corner brace of the prefabricated foundation pit support of this utility model, place the left fixing part in front of the transverse waler of the prefabricated foundation pit support and install it on the transverse waler. Place the right fixing part on the left side of the longitudinal waler of the prefabricated foundation pit support and install it on the longitudinal waler. Adjust the degree to which the left end of the right corner brace is inserted into the sliding groove along the inclination direction of the left corner brace (if a jack compartment exists, the jack can be placed in the jack compartment and loaded for auxiliary adjustment). That is, adjust the length of the components of the left and right corner braces to achieve the design distance. Insert an appropriate number of limiting rods into the limiting holes (if a jack is used, unload and remove the jack). Therefore, its design is ingenious, its structure is simple, its manufacturing is convenient, its manufacturing cost is low, and it is suitable for large-scale promotion and application.

[0026] These and other objects, features and advantages of this utility model will be fully apparent from the following detailed description and drawings, and can be achieved by the means, devices and combinations thereof specifically pointed out in the description of the utility model. Attached Figure Description

[0027] Figure 1This is a partial three-dimensional schematic diagram of a specific embodiment of the adjustable angle brace for prefabricated foundation pit support of this utility model during use.

[0028] Figure 2 yes Figure 1 The diagram shows a partial exploded perspective view of the left side of the specific embodiment.

[0029] Figure 3 yes Figure 1 The enlarged three-dimensional schematic diagram of the right side of the specific embodiment shown.

[0030] (Symbol Explanation)

[0031] 1. Prefabricated adjustable corner brace for foundation pit support; 101 Left fixing component; 102 Right fixing component; 103 Left corner brace; 104 Right corner brace; 105 Limiting rod; 106 Sliding groove; 107 Limiting hole; 108 First upper left ear plate; 109 First lower left ear plate; 110 Second upper left ear plate; 111 Second lower left ear plate; 112 Left pin; 113 Left connecting plate; 114 Right fixing bolt; 115 First upper right ear plate; 116 First lower right ear plate; 117 Second upper right ear plate; 118 Second lower right ear plate; 119 Right pin; 120 Right connecting plate; 121 Right connecting bolt; 122 Left groove; 123 Right groove; 124 Jack compartment;

[0032] 2. Prefabricated foundation pit support; 21. Horizontal walers; 22. Longitudinal walers; 23. Steel sheet piles. Detailed Implementation

[0033] In order to better understand the technical content of this utility model, the following embodiments are provided for detailed description.

[0034] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., 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 utility model 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 utility model.

[0035] Please see Figures 1-3 As shown, in a specific embodiment of this utility model, the prefabricated adjustable corner brace 1 for foundation pit support includes a left fixing member 101, a right fixing member 102, a left corner brace rod 103, a right corner brace rod 104, and a limiting rod 105, wherein:

[0036] The left fixing member 101 is used to be located in front of the transverse waler 21 of the prefabricated foundation pit support 2 and installed on the transverse waler 21. The right fixing member 102 is located to the right front of the left fixing member 101 and is used to be located on the left side of the longitudinal waler 22 of the prefabricated foundation pit support 2 and installed on the longitudinal waler 22.

[0037] The left corner brace 103 is horizontally arranged and inclined to the right front in a direction from left to right. The left end of the left corner brace 103 is located in front of the left fixing member 101 and is horizontally rotatably connected to the left fixing member 101. The right end of the left corner brace 103 is provided with a sliding groove 106 along the inclined direction of the left corner brace 103. The right corner brace 104 is horizontally arranged and is inclined along the left corner brace 103. The right end of the right corner brace 104 is located to the left of the right fixing member 102 and is horizontally rotatably connected to the right fixing member 102. The left end of the right corner brace 104 is movably inserted into the sliding groove 106 along the inclined direction of the left corner brace 103.

[0038] The top of the left corner support 103 is provided with a limiting hole 107 along the inclined direction of the left corner support 103. The limiting hole 107 is connected to the sliding groove 106. The limiting rod 105 is vertically arranged and vertically inserted into the limiting hole 107 and is movable along the inclined direction of the left corner support 103. There are multiple limiting rods 105, which are arranged to abut against each other in sequence along the inclined direction of the left corner support 103. The leftmost limiting rod 105 abuts against the left end of the limiting hole 107, and the rightmost limiting rod 105 abuts against the left end of the right corner support 104.

[0039] The left fixing member 101 can have any suitable shape, please refer to Figures 1-2 As shown, in a specific embodiment of this utility model, the left fixing member 101 is a left fixing plate, which is vertically arranged and arranged in the left-right direction.

[0040] The left fixing plate is used to be located in front of the transverse waler 21 and installed on the transverse waler 21. It can adopt any suitable structure. In a specific embodiment of this utility model, the prefabricated pit support adjustable angle brace 1 also includes a left fixing bolt (not shown in the figure). The left fixing bolt is arranged in the front-back direction. The front end of the left fixing bolt is located in front of the left fixing plate and abuts against the left fixing plate. The rear end of the left fixing bolt passes through the left fixing plate in the front-back direction and is used to pass through and threadedly engage the transverse waler 21.

[0041] The left end of the left corner brace 103 is located in front of the left fixed plate and is horizontally rotatably connected to the left fixed plate. Any suitable structure can be used; please refer to [link / reference]. Figures 1-2 As shown, in a specific embodiment of this utility model, the prefabricated adjustable corner brace 1 for foundation pit support further includes a first upper left ear plate 108, a first lower left ear plate 109, a second upper left ear plate 110, a second lower left ear plate 111, and a left pin 112. The first upper left ear plate 108 and the first lower left ear plate 109 are both horizontally arranged and spaced apart vertically. The first upper left ear plate 108 and the first lower left ear plate 109 are both located in front of the left fixed plate and are both connected to the left fixed plate. The second upper left ear plate 110 and the second lower left ear plate 111 are both horizontally arranged and spaced apart vertically. The second upper left ear plate 110 and the second lower left ear plate 111 are both located in front of the left fixed plate and are both connected to the left fixed plate. The left end of the corner brace 103 is located to the left rear and is connected to the left end of the left corner brace 103. The first upper left ear plate 108 and the first lower left ear plate 109 are located between the second upper left ear plate 110 and the second lower left ear plate 111 and abut against the second upper left ear plate 110 and the second lower left ear plate 111 respectively. The left pin 112 is vertically arranged and passes through the second upper left ear plate 110, the first upper left ear plate 108, the first lower left ear plate 109 and the second lower left ear plate 111, and is horizontally rotatable relative to the second upper left ear plate 110, the first upper left ear plate 108, the first lower left ear plate 109 and the second lower left ear plate 111. With the above configuration, the second upper left ear plate 110 and the second lower left ear plate 111 can rotate horizontally relative to the first upper left ear plate 108 and the first lower left ear plate 109 via the left pin 112, thereby realizing that the left end of the left corner brace 103 can rotate horizontally relative to the left fixed plate.

[0042] The second upper left ear plate 110 and the second lower left ear plate 111 are both located to the left rear of the left end of the left corner brace 103 and are both connected to the left end of the left corner brace 103. Any suitable structure can be used; please refer to [link / reference]. Figures 1-2 As shown, in a specific embodiment of this utility model, the prefabricated adjustable corner brace 1 for foundation pit support further includes a left connecting plate 113. The left connecting plate 113 is vertically arranged and arranged in a direction perpendicular to the inclination direction of the left corner brace 103. The left connecting plate 113 is located to the left rear of the left end of the left corner brace 103 and is connected to the left end of the left corner brace 103. The second upper left ear plate 110 and the second lower left ear plate 111 are both located to the left rear of the left connecting plate 113 and are both connected to the left connecting plate 113.

[0043] The left connecting plate 113 is connected to the left end of the left corner brace 103, and can be detachably connected by, for example, a left connecting bolt (not shown in the figure).

[0044] The right fixing member 102 can have any suitable shape, please refer to Figure 1 and Figure 3 As shown, in a specific embodiment of this utility model, the right fixing member 102 is a right fixing plate, which is vertically arranged and arranged along the front-to-back direction.

[0045] The right fixing plate is positioned on the left side of the longitudinal waler 22 and installed on the longitudinal waler 22. It can employ any suitable structure; please refer to [link / reference]. Figure 3 As shown, in a specific embodiment of this utility model, the prefabricated pit support adjustable angle brace 1 further includes a right fixing bolt 114. The right fixing bolt 114 is arranged in the left-right direction. The left end of the right fixing bolt 114 is located on the left side of the right fixing plate and abuts against the right fixing plate. The right end of the right fixing bolt 114 passes through the right fixing plate in the left-right direction and is used for threading and engaging the longitudinal waler 22.

[0046] The right end of the right corner brace 104 is located to the left of the right fixed plate and is horizontally rotatably connected to the right fixed plate. Any suitable structure can be used; please refer to [link / reference]. Figure 1 and Figure 3As shown, in a specific embodiment of this utility model, the prefabricated adjustable corner brace 1 for foundation pit support further includes a first upper right ear plate 115, a first lower right ear plate 116, a second upper right ear plate 117, a second lower right ear plate 118, and a right pin 119. The first upper right ear plate 115 and the first lower right ear plate 116 are both horizontally arranged and spaced apart vertically. The first upper right ear plate 115 and the first lower right ear plate 116 are both located to the left of the right fixed plate and are both connected to the right fixed plate. The second upper right ear plate 117 and the second lower right ear plate 118 are both horizontally arranged and spaced apart vertically. The second upper right ear plate 117 and the second lower right ear plate 118 are both located to the left of the right fixed plate and are both connected to the right fixed plate. The right front of the right end of the right corner brace 104 is connected to the right end of the right corner brace 104. The first upper right ear plate 115 and the first lower right ear plate 116 are located between the second upper right ear plate 117 and the second lower right ear plate 118 and abut against the second upper right ear plate 117 and the second lower right ear plate 118 respectively. The right pin 119 is vertically arranged and passes through the second upper right ear plate 117, the first upper right ear plate 115, the first lower right ear plate 116 and the second lower right ear plate 118, and is horizontally rotatable relative to the second upper right ear plate 117, the first upper right ear plate 115, the first lower right ear plate 116 and the second lower right ear plate 118. With the above configuration, the second upper right ear plate 117 and the second lower right ear plate 118 can rotate horizontally relative to the first upper right ear plate 115 and the first lower right ear plate 116 via the right pin 119, thereby realizing the horizontal rotation of the right end of the right corner brace 104 relative to the right fixed plate.

[0047] The second upper right ear plate 117 and the second lower right ear plate 118 are both located to the right front of the right end of the right corner brace 104 and are both connected to the right end of the right corner brace 104. Any suitable structure can be used; please refer to [link / reference]. Figure 1 and Figure 3 As shown, in a specific embodiment of this utility model, the prefabricated adjustable corner brace 1 for foundation pit support further includes a right connecting plate 120. The right connecting plate 120 is vertically arranged and arranged in a direction perpendicular to the inclination direction of the left corner brace 103. The right connecting plate 120 is located in front of the right end of the right corner brace 104 and is connected to the right end of the right corner brace 104. The second upper right ear plate 117 and the second lower right ear plate 118 are both located in front of the right connecting plate 120 and are both connected to the right connecting plate 120.

[0048] The right connecting plate 120 is connected to the right end of the right corner brace 104, and can be detachably connected by, for example, the right connecting bolt 121.

[0049] The front sides of the left corner brace 103 and the right corner brace 104 can have any suitable configuration; please refer to [link / reference]. Figures 1-2 As shown, in a specific embodiment of this utility model, a left groove 122 is provided on the front side of the left corner support 103 along the inclined direction of the left corner support 103, and a right groove 123 is provided on the front side of the right corner support 104 along the inclined direction of the left corner support 103. The right end of the left groove 122 and the left end of the right groove 123 are both open and interconnected, thus forming a jack chamber 124 between the left groove 122 and the right groove 123. With the above configuration, when it is necessary to adjust the degree to which the left end of the right corner support 104 is inserted into the sliding groove 106 along the inclined direction of the left corner support 103, a jack can be placed in the jack chamber 124 and loaded for auxiliary adjustment.

[0050] The limiting hole 107 can have any suitable shape, please refer to Figure 2 As shown, in a specific embodiment of this utility model, the limiting hole 107 is a rectangular hole.

[0051] The number of limiting rods 105 can be determined as needed. The term "multiple rods" refers to two or more rods. Please refer to [link to relevant documentation]. Figure 2 As shown, in a specific embodiment of this utility model, the number of limiting rods 105 is 3.

[0052] The limiting rod 105 can have any suitable shape, please refer to Figure 2 As shown, in a specific embodiment of this utility model, the limiting rod 105 is a T-shaped rod.

[0053] The sliding groove 106 and the left end of the right corner support 104 can have any suitable shape. In a specific embodiment of this utility model, the sliding groove 106 is an I-shaped groove, and the left end of the right corner support 104 is an I-shaped end. That is, the cross-section of the sliding groove 106 and the cross-section of the left end of the right corner support 104 are both I-shaped.

[0054] When using, such as Figure 1As shown, the sheet piles 23 of the prefabricated foundation pit support 2 are used to support the sidewalls of the foundation pit. The sheet piles 23 are supported by transverse walers 21 and longitudinal walers 22. Corner braces need to be installed between the right end of the transverse waler 21 and the rear end of the longitudinal waler 22. Specifically, the left fixing member 101 is placed in front of the transverse waler 21 and installed on the transverse waler 21, and the right fixing member 102 is placed on the left side of the longitudinal waler 22 and installed on the longitudinal waler 22. Adjustment The left end of the right corner brace 104 is inserted into the sliding groove 106 along the inclined direction of the left corner brace 103 to the extent that (if the jack chamber 124 is present, the jack can be placed in the jack chamber 124 and loaded for auxiliary adjustment), that is, the length of the components of the left corner brace 103 and the right corner brace 104 is adjusted to reach the design distance, and an appropriate number of limit rods 105 are inserted into the limit hole 107 (if a jack is used, the jack is unloaded and removed).

[0055] Therefore, by using this utility model, the depth of the left end of the right corner brace inserted into the sliding groove is limited by the limiting hole and the limiting rod. If necessary, a jack is placed in the jack compartment to assist in the adjustment. Because the left end of the right corner brace can move in the sliding groove along the tilt direction of the left corner brace, the length of the corner brace can vary within a certain range. The limiting rod inserted into the limiting hole occupies the space of the sliding groove. Therefore, by increasing or decreasing the number of limiting rods, the change in the length of the corner brace can be limited, thereby realizing the function of adjusting the length of the corner brace.

[0056] This utility model has an adjustable length, making it suitable for foundation pits of different sizes. It can be disassembled and reused, improving construction efficiency and reducing construction costs.

[0057] In summary, the adjustable angle brace of this prefabricated foundation pit support has an adjustable length, making it suitable for foundation pits of different sizes. It is convenient and flexible to use, improves construction efficiency, reduces construction costs, has an ingenious design, simple structure, is easy to manufacture, and has low manufacturing costs, making it suitable for large-scale promotion and application.

[0058] Therefore, it is evident that the objective of this utility model has been fully and effectively achieved. The function and structural principles of this utility model have been demonstrated and explained in the embodiments. Without departing from the stated principles, any modifications can be made to the implementation methods. Therefore, this utility model includes all modified embodiments based on the spirit and scope of the claims.

Claims

1. A prefabricated adjustable corner brace for foundation pit support, characterized in that, Includes a left fixing component, a right fixing component, a left corner brace, a right corner brace, and a limiting rod, wherein: The left fixing member is used to be located in front of the transverse waler of the prefabricated foundation pit support and installed on the transverse waler. The right fixing member is located to the right front of the left fixing member and is used to be located to the left of the longitudinal waler of the prefabricated foundation pit support and installed on the longitudinal waler. The left corner brace is horizontally positioned and inclined to the right front in a direction from left to right. The left end of the left corner brace is located in front of the left fixing member and is horizontally rotatably connected to the left fixing member. The right end of the left corner brace is provided with a sliding groove along the inclined direction of the left corner brace. The right corner brace is horizontally positioned and along the inclined direction of the left corner brace. The right end of the right corner brace is located to the left of the right fixing member and is horizontally rotatably connected to the right fixing member. The left end of the right corner brace is movably inserted into the sliding groove along the inclined direction of the left corner brace. The top of the left corner support rod is provided with a limiting hole along the inclined direction of the left corner support rod. The limiting hole is connected to the sliding groove. The limiting rod is vertically arranged and vertically inserted into the limiting hole and is movable along the inclined direction of the left corner support rod. There are multiple limiting rods, which are arranged in sequence along the inclined direction of the left corner support rod. The leftmost limiting rod abuts against the left end of the limiting hole, and the rightmost limiting rod abuts against the left end of the right corner support rod.

2. The adjustable angle brace for prefabricated foundation pit support as described in claim 1, characterized in that, The left fixing member is a left fixing plate, which is vertically arranged and positioned along the left-right direction.

3. The adjustable angle brace for prefabricated foundation pit support as described in claim 2, characterized in that, The prefabricated adjustable corner brace for foundation pit support also includes a left fixing bolt. The left fixing bolt is arranged in the front-back direction. The front end of the left fixing bolt is located in front of the left fixing plate and abuts against the left fixing plate. The rear end of the left fixing bolt passes through the left fixing plate in the front-back direction and is used for threading and engaging the transverse waler.

4. The adjustable angle brace for prefabricated foundation pit support as described in claim 2, characterized in that, The prefabricated adjustable corner brace for foundation pit support also includes a first upper left ear plate, a first lower left ear plate, a second upper left ear plate, a second lower left ear plate, and a left pin. The first upper left ear plate and the first lower left ear plate are both horizontally arranged and spaced apart vertically. The first upper left ear plate and the first lower left ear plate are both located in front of the left fixed plate and are both connected to the left fixed plate. The second upper left ear plate and the second lower left ear plate are both horizontally arranged and spaced apart vertically. The second upper left ear plate and the second lower left ear plate are both located on the left corner brace. The left end is located at the left rear and is connected to the left end of the left corner brace. The first upper left ear plate and the first lower left ear plate are located between the second upper left ear plate and the second lower left ear plate and respectively abut against the second upper left ear plate and the second lower left ear plate. The left pin is vertically arranged and passes through the second upper left ear plate, the first upper left ear plate, the first lower left ear plate and the second lower left ear plate, and is horizontally rotatable relative to the second upper left ear plate, the first upper left ear plate, the first lower left ear plate and the second lower left ear plate.

5. The adjustable angle brace for prefabricated foundation pit support as described in claim 1, characterized in that, The right fixing member is a right fixing plate, which is vertically arranged and arranged along the front-to-back direction.

6. The adjustable angle brace for prefabricated foundation pit support as described in claim 5, characterized in that, The prefabricated adjustable corner brace for foundation pit support also includes a right fixing bolt. The right fixing bolt is arranged in the left-right direction. The left end of the right fixing bolt is located on the left side of the right fixing plate and abuts against the right fixing plate. The right end of the right fixing bolt passes through the right fixing plate in the left-right direction and is used for threading and engaging the longitudinal waler.

7. The adjustable angle brace for prefabricated foundation pit support as described in claim 5, characterized in that, The prefabricated adjustable corner brace for foundation pit support also includes a first upper right ear plate, a first lower right ear plate, a second upper right ear plate, a second lower right ear plate, and a right pin. The first upper right ear plate and the first lower right ear plate are both horizontally arranged and spaced apart vertically. Both the first upper right ear plate and the first lower right ear plate are located to the left of the right fixed plate and are connected to the right fixed plate. The second upper right ear plate and the second lower right ear plate are both horizontally arranged and spaced apart vertically. Both the second upper right ear plate and the second lower right ear plate are located on the right corner brace. The right end is located at the right front and is connected to the right end of the right corner support rod. The first upper right ear plate and the first lower right ear plate are located between the second upper right ear plate and the second lower right ear plate and respectively abut against the second upper right ear plate and the second lower right ear plate. The right pin is vertically arranged and passes through the second upper right ear plate, the first upper right ear plate, the first lower right ear plate and the second lower right ear plate, and is horizontally rotatable relative to the second upper right ear plate, the first upper right ear plate, the first lower right ear plate and the second lower right ear plate.

8. The adjustable angle brace for prefabricated foundation pit support as described in claim 1, characterized in that, The front side of the left corner brace is provided with a left groove along the inclined direction of the left corner brace, and the front side of the right corner brace is provided with a right groove along the inclined direction of the left corner brace. The right end of the left groove and the left end of the right groove are both open and connected to each other, thereby forming a jack chamber between the left groove and the right groove.

9. The adjustable angle brace for prefabricated foundation pit support as described in claim 1, characterized in that, The limiting rod is a T-shaped rod.

10. The adjustable angle brace for prefabricated foundation pit support as described in claim 1, characterized in that, The sliding groove is an I-shaped groove, and the left end of the right corner support is an I-shaped end.

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