Foundation pit outer support structure

Abstract

The utility model discloses a foundation pit outer supporting structure. When the foundation pit outer supporting structure is used for a groove type foundation pit, the foundation pit outer supporting structure comprises a foundation pit outer supporting piece, a fixed connecting piece and a foundation pit inner supporting piece. The foundation pit inner supporting pieces are constructed in the groove type foundation pit in the direction perpendicular to the length direction of the groove type foundation pit, and the pair of foundation pit inner supporting pieces are arranged in a spaced mode. The two ends of the foundation pit outer supporting pieces are connected with the ends, on the same side, of the pair of foundation pit inner supporting pieces respectively, the foundation pit outer supporting pieces are located on one side of the exterior of the groove type foundation pit and fixedly connected with the surrounding purlin through the multiple fixing connecting pieces, and the pair of foundation pit outer supporting pieces are symmetrically located on the two sides of the exterior of the groove type foundation pit. When the foundation pit outer supporting structure is used for a rectangular foundation pit, the foundation pit outer supporting structure comprises a foundation pit outer supporting piece and a fixed connecting piece; the foundation pit outer supporting piece is of an annular structure and arranged outside the rectangular foundation pit in a surrounding mode in the circumferential direction, and the foundation pit outer supporting piece is fixedly connected with the surrounding purlin through a plurality of fixing connecting pieces. The foundation pit supporting device can solve the problem that a foundation pit supporting device in the prior art affects foundation pit construction.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and in particular to an external support structure for foundation pits. Background Technology

[0002] During the construction of an excavation pit, in order to ensure the safety of the excavation and the stability of the surrounding soil, it is often necessary to install support devices inside the pit. Traditional excavation pit support devices include concrete supports and steel supports. These devices are typically supported on the retaining structures on both sides of the pit to provide support and protection for the pit's sidewalls.

[0003] The more foundation pit support devices installed, the higher the stability of the foundation pit. However, since these devices are located inside the foundation pit, they occupy internal working space, significantly impacting excavation, internal structure construction, and hoisting processes. The presence of these devices causes numerous inconveniences during construction and poses a significant risk of collision with the support devices during component hoisting, resulting in substantial safety hazards. Conversely, reducing the number of support devices decreases the stability and safety of the foundation pit. Therefore, there is a need for an external foundation pit support structure that can address the problem of existing support devices affecting foundation pit construction. Summary of the Invention

[0004] The purpose of this utility model is to provide an external support structure for foundation pits, which can solve the problem that foundation pit support devices affect foundation pit construction in the prior art.

[0005] This utility model is implemented as follows:

[0006] An external support structure for a trench-type foundation pit is disclosed. The external support structure includes external support components, fixed connectors, and internal support components. The internal support components are installed within the trench-type foundation pit perpendicular to its length, with a pair of internal support components spaced apart. The two ends of the external support components are respectively connected to one end of the pair of internal support components on the same side, positioning the external support components on the outer side of the trench-type foundation pit. The external support components are fixedly connected to the walers of the trench-type foundation pit via several fixed connectors. A pair of external support components are symmetrically located on both sides of the outer surface of the trench-type foundation pit.

[0007] The aforementioned external support for the foundation pit has an arched structure, and the arching direction of the external support is along the width direction of the trench-type foundation pit.

[0008] The projected length of the external support member of the foundation pit along the length of the trench-type foundation pit is consistent with the spacing between a pair of internal support members of the foundation pit, and several fixed connecting members are arranged at intervals along the length of the trench-type foundation pit.

[0009] The end of the support member inside the foundation pit is vertically connected to the waler along the trench-type foundation pit.

[0010] The fixed connecting parts are threaded steel bars and nuts. One end of the threaded steel bar passes through the external support of the foundation pit and is locked and fixed to the external support of the foundation pit by the nut. The other end of the threaded steel bar passes vertically through the waler along the trench-type foundation pit and is locked and fixed to the waler by the nut.

[0011] An external support structure for a foundation pit is disclosed, which is used for a rectangular foundation pit. The external support structure includes an external support component and fixed connectors. The external support component has a ring structure and is circumferentially arranged around the outside of the rectangular foundation pit. The external support component is fixedly connected to the waler of the rectangular foundation pit by a number of fixed connectors.

[0012] The fixed connecting parts are threaded steel bars and nuts. One end of the threaded steel bar passes through the external support of the foundation pit and is locked and fixed to the external support of the foundation pit by the nut. The other end of the threaded steel bar passes vertically through the waler of the rectangular foundation pit and is locked and fixed to the waler by the nut.

[0013] The external support for the foundation pit is in the form of a circular or elliptical ring structure, and the external support for the foundation pit is arranged concentrically with the rectangular foundation pit. Several fixed connecting members are arranged at intervals along the circumference of the rectangular foundation pit.

[0014] Compared with the prior art, this utility model has the following advantages:

[0015] 1. This utility model, by providing external support components and fixed connectors, moves the traditional internal support components to the outside of the foundation pit and fixes them to the waler of the foundation pit through the fixed connectors. The tensile force of the external tensile support replaces the pressure of the internal support, thereby minimizing the number of internal supports required (only one pair of internal support components is needed) or eliminating the need for internal supports altogether. This solves the problem of interference and impact of internal supports on foundation pit construction and ensures safe construction of the foundation pit.

[0016] 2. This utility model has an external support component for the foundation pit. The arched external support component is suitable for trench-type foundation pits, and the ring-shaped external support component is suitable for rectangular foundation pits. The ring-shaped external support component forms an arched structure on the outer side of each side of the rectangular foundation pit. The arched structure has good compressive and bending resistance, and can effectively support the tensile force generated by the threaded steel, thereby ensuring the stability of the tensile support outside the pit and ensuring the support effect of the external support on the foundation pit.

[0017] 3. This utility model has a simple structure, is easy to manufacture and construct, is convenient to assemble and disassemble, and has a low cost. It can improve the construction efficiency of the foundation pit while ensuring the safety of the foundation pit support. Attached Figure Description

[0018] Figure 1 This is a construction schematic diagram of Embodiment 1 of the external support structure for foundation pits of this utility model;

[0019] Figure 2 This is a construction schematic diagram of Embodiment 2 of the external support structure for foundation pits of this utility model.

[0020] In the diagram, 1 is the external support component of the foundation pit, 2 is the fixed connector, 3 is the internal support component of the foundation pit, 100 is the trench-type foundation pit, 101 is the waler, 102 is the steel sheet pile, and 200 is the rectangular foundation pit. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1: Please refer to the appendix. Figure 1 An external support structure for a trench-type foundation pit is disclosed. The external support structure includes an external support member 1, fixed connectors 2, and an internal support member 3. The internal support member 3 is installed within the trench-type foundation pit 100 perpendicular to its length direction, with a pair of internal support members 3 spaced apart. The two ends of the external support member 1 are respectively connected to one end of the pair of internal support members 3 on the same side, so that the external support member 1 is located on the outer side of the trench-type foundation pit 100. The external support member 1 is fixedly connected to the waler 101 of the trench-type foundation pit 100 via several fixed connectors 2. A pair of external support members 1 are symmetrically located on both sides of the outer side of the trench-type foundation pit 100.

[0023] By setting the external support member 1 outside the trench-type foundation pit 100 and tightening it between the external support member 1 and the waler 101 of the trench-type foundation pit 100 through the fixing connector 2, the tensile force of the external tensile support can replace the pressure of the internal support, which can greatly reduce the number of internal support members 3. Only one pair of internal support members 3 needs to be set.

[0024] A pair of external support members 1 and a pair of internal support members 3 are connected to form a closed loop structure, which together form a load-bearing structure to provide effective support for the trench-type foundation pit 100 and can greatly avoid interference and impact on the foundation pit construction.

[0025] The external support member 1 of the foundation pit has an arched structure, and the arching direction of the external support member 1 is along the width direction of the trench-type foundation pit 100.

[0026] The arched structure has good compressive and bending resistance. The number of fixed connectors 2 can be determined according to the arching height of the external support 1, the spacing between a pair of internal support 3, and the construction conditions of the foundation pit, so as to meet the support requirements of the trench-type foundation pit 100.

[0027] The projected length of the external support member 1 in the length direction of the trench-type foundation pit 100 is consistent with the spacing between the pair of internal support members 3, ensuring that both ends of the external support member 1 can be fixedly connected to one end of the pair of internal support members 3 on the same side. Several fixed connecting members 2 are arranged at intervals along the length direction of the trench-type foundation pit 100.

[0028] The end of the support member 3 in the foundation pit is vertically connected to the waler 101 along the trench-type foundation pit 100 to ensure the stability of force and force transmission to the greatest extent.

[0029] The fixed connector 2 is a threaded steel bar and a nut. One end of the threaded steel bar passes through the external support member 1 of the foundation pit and is locked and fixed to the external support member 1 of the foundation pit by the nut. The other end of the threaded steel bar passes vertically through the waler 101 and the sheet pile 102 along the trench-type foundation pit 100 and is locked and fixed to the waler 101 by the nut.

[0030] During installation, through holes for installing threaded steel bars are made in the external support 1, waler 101, and sheet piles 102. The threaded steel bars are secured to the waler 101 by screwing them into the nuts and tightening the nuts on the outer side of the external support 1 and the inner side of the waler 101. The tension of the threaded steel bars restricts the displacement of the waler 101 and sheet piles 102, thus providing support for the foundation pit.

[0031] In this embodiment, please refer to the appendix. Figure 1 The construction method and working principle of the external support structure for the foundation pit are as follows:

[0032] After the sheet piles 102 and walers 101 of the trench-type foundation pit 100 are constructed (the sheet piles 102 and walers 101 of the trench-type foundation pit 100 are constructed using conventional foundation pit support technology, which will not be described in detail here), the internal support components 3 are constructed along the width direction of the trench-type foundation pit 100. Preferably, the internal support components 3 can be traditional cast-in-place concrete internal supports, with both ends of a pair of internal support components 3 vertically fixed to the walers 101. The pair of internal support components 3 can be spaced far apart, for example, the spacing between the pair of internal support components 3 can cover the construction area of ​​the trench-type foundation pit 100, minimizing the impact on the internal structure construction and hoisting operations of the foundation pit.

[0033] An arched external support component 1 for the foundation pit is constructed using steel components. The projected length of the external support component 1 along the length of the trench-type foundation pit 100 is consistent with the spacing between a pair of internal support components 3. The arch height of the external support component 1 can be determined according to the actual stress requirements. Holes are made at intervals on the external support component 1, the sheet piles 102, and the walers 101 for through-installation of fixing connectors 2. Both ends of the external support component 1 are fixedly connected to one end on the same side of a pair of internal support components 3, so that a pair of external support components 1 are symmetrically installed on both sides of the trench-type foundation pit 100.

[0034] The fixed connector 2 uses precision-rolled threaded steel, nuts, and washers. One end of the precision-rolled threaded steel passes through the opening of the external support 1 of the foundation pit and is locked and fixed to the side (outer side) of the external support 1 of the foundation pit away from the trench-type foundation pit 100 by the nut and the washer. The other end of the precision-rolled threaded steel passes through the opening of the sheet pile 102 and the waler 101 and is locked and fixed to the side (inner side) of the waler 101 facing the trench-type foundation pit 100 by the nut and the washer.

[0035] By using precision-rolled threaded steel bars to tie and fix the external support member 1 to the waler 101 of the trench-type foundation pit 100, the displacement of the waler 101 and the sheet pile 102 can be restricted. The external support member 1 and the internal support member 3 form a support structure that shares the load, moving the traditional support located inside the foundation pit to the outside of the foundation pit. This provides effective support for the foundation pit enclosure while minimizing interference and impact on the foundation pit construction.

[0036] The arched external support component 1 possesses the advantages of an arch, namely, excellent compressive and bending resistance, which can effectively support the tensile force generated by the precision-rolled threaded steel bar, ensuring the support effect for the trench-type foundation pit 100. After the construction of the external support structure is completed, conventional operations such as foundation pit excavation, internal structure construction, and hoisting can be carried out.

[0037] Example 2: Please refer to the appendix. Figure 2 An external support structure for a foundation pit is provided for a rectangular foundation pit 200. The external support structure includes an external support member 1 and a fixing connector 2. The external support member 1 has a ring structure and is arranged circumferentially around the outside of the rectangular foundation pit 200. The external support member 1 is fixedly connected to the waler 101 of the rectangular foundation pit 200 by a number of fixing connectors 2.

[0038] The annular external support 1 is circumferentially arranged around the outside of the rectangular foundation pit 200 and is tightened and fixed between the external support 1 and the waler 101 of the rectangular foundation pit 200 by the fixing connector 2. The annular external support 1 forms a load-bearing structure to provide effective support for the rectangular foundation pit 200. By using the tensile force of the external tensile support to replace the pressure of the internal support, it is possible to avoid interference and impact on the foundation pit construction without setting up internal support in the rectangular foundation pit 200.

[0039] The fixed connector 2 is a threaded steel bar and a nut. One end of the threaded steel bar passes through the external support member 1 of the foundation pit and is locked and fixed to the external support member 1 of the foundation pit by the nut. The other end of the threaded steel bar passes vertically through the waler 101 of the rectangular foundation pit 200 and is locked and fixed to the waler 101 and the sheet pile 102 by the nut.

[0040] During installation, through holes for installing threaded steel bars are made in the external support 1, waler 101, and sheet piles 102. The threaded steel bars are secured to the waler 101 by screwing them into the nuts and tightening the nuts on the outer side of the external support 1 and the inner side of the waler 101. The tension of the threaded steel bars restricts the displacement of the waler 101 and sheet piles 102, thus providing support for the foundation pit.

[0041] The external support member 1 of the foundation pit has a circular or elliptical ring structure, and the external support member 1 of the foundation pit is arranged concentrically with the rectangular foundation pit 200. Several fixed connecting members 2 are arranged at intervals along the circumference of the rectangular foundation pit 200.

[0042] The rectangular foundation pit 200 is usually axisymmetric, and the circular or elliptical ring is also axisymmetric. When setting the external support 1 of the foundation pit, the external support 1 of the foundation pit can be arranged concentrically with the rectangular foundation pit 200, and the axis of symmetry of the external support 1 of the foundation pit can be aligned with the axis of symmetry of the rectangular foundation pit 200, which can maximize the stability of the stress.

[0043] The number of fixed connectors 2 can be determined according to the shape and size of the external support 1, the size of the rectangular foundation pit 200, and the construction conditions of the external support structure, so as to meet the support requirements of the rectangular foundation pit 200.

[0044] In this embodiment, please refer to the appendix. Figure 2 The construction method and working principle of the external support structure for the foundation pit are as follows:

[0045] After the construction of the sheet piles 102 and walers 101 of the rectangular foundation pit 200 is completed (the sheet piles 102 and walers 101 of the rectangular foundation pit 200 are constructed using conventional foundation pit support technology, which will not be described in detail here), taking the rectangular foundation pit 200 with a square structure as an example, a circular outer support component 1 of the foundation pit is made of steel components according to the size of the rectangular foundation pit 200, and the outer support component 1 is placed concentrically outside the rectangular foundation pit 200.

[0046] Holes are made at intervals on the external support 1, the sheet piles 102 of the rectangular foundation pit 200, and the waler 101 for through-installation of the fixing connector 2.

[0047] The fixed connector 2 uses precision-rolled threaded steel, nuts, and washers. One end of the precision-rolled threaded steel passes through the opening of the external support 1 of the foundation pit and is locked and fixed to the side (outer side) of the external support 1 of the foundation pit away from the rectangular foundation pit 200 by the nut and the washer. The other end of the precision-rolled threaded steel passes through the opening of the sheet pile 102 and the waler 101 and is locked and fixed to the side (inner side) of the waler 101 facing the rectangular foundation pit 200 by the nut and the washer.

[0048] By using precision-rolled threaded steel bars to tie and fix the external support 1 of the foundation pit to the waler 101 of the rectangular foundation pit 200, the displacement of the waler 101 and the sheet pile 102 can be restricted. The circular structure of the external support 1 of the foundation pit is subjected to overall force, and the traditional support located inside the foundation pit is moved to the outside of the foundation pit. The internal support of the rectangular foundation pit 200 does not need to be set up, thereby avoiding interference and impact on the foundation pit construction.

[0049] The annular external support component 1 forms a four-segment arch structure on the outside of the rectangular foundation pit 200. It possesses the advantages of an arch, namely good compressive and bending resistance, effectively supporting the tensile force generated by the precision-rolled threaded steel bars and ensuring the effective support for the rectangular foundation pit 200. After the external support structure is completed, conventional operations such as excavation, internal structure construction, and hoisting can be carried out.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. An external support structure for a foundation pit, characterized in that: The external support structure is used for trench-type foundation pits (100); the external support structure includes an external support component (1), a fixed connector (2), and an internal support component (3); the internal support component (3) is constructed perpendicular to the length direction of the trench-type foundation pit (100) inside the trench-type foundation pit (100), and a pair of internal support components (3) are spaced apart; the two ends of the external support component (1) are respectively connected to one end of the pair of internal support components (3) on the same side, so that the external support component (1) is located on the outside side of the trench-type foundation pit (100), and the external support component (1) is fixedly connected to the waler (101) of the trench-type foundation pit (100) through several fixed connectors (2), and a pair of external support components (1) are symmetrically located on the outside sides of the trench-type foundation pit (100).

2. The external support structure for the foundation pit according to claim 1, characterized in that: The external support member (1) of the foundation pit has an arched structure, and the arching direction of the external support member (1) is along the width direction of the trench-type foundation pit (100).

3. The external support structure for the foundation pit according to claim 1, characterized in that: The projection length of the external support member (1) of the foundation pit in the length direction of the trench foundation pit (100) is consistent with the spacing between a pair of internal support members (3) of the foundation pit, and several fixed connecting members (2) are arranged at intervals along the length direction of the trench foundation pit (100).

4. The external support structure for the foundation pit according to claim 1 or 3, characterized in that: The end of the support member (3) in the foundation pit is vertically connected to the waler (101) along the trench-type foundation pit (100).

5. The external support structure for the foundation pit according to claim 1 or 3, characterized in that: The fixed connector (2) is a threaded steel bar and a nut. One end of the threaded steel bar passes through the external support member (1) of the foundation pit and is locked and fixed to the external support member (1) of the foundation pit by the nut. The other end of the threaded steel bar passes vertically through the waler (101) along the trench-type foundation pit (100) and is locked and fixed to the waler (101) by the nut.

6. An external support structure for a foundation pit, characterized in that: The external support structure for the foundation pit is used for a rectangular foundation pit (200); the external support structure for the foundation pit includes an external support member (1) and a fixed connector (2); the external support member (1) has a ring structure and is arranged circumferentially around the outside of the rectangular foundation pit (200), and the external support member (1) is fixedly connected to the waler (101) of the rectangular foundation pit (200) through several fixed connectors (2).

7. The external support structure for the foundation pit according to claim 6, characterized in that: The fixed connector (2) is a threaded steel bar and a nut. One end of the threaded steel bar passes through the external support member (1) of the foundation pit and is locked and fixed to the external support member (1) of the foundation pit by the nut. The other end of the threaded steel bar passes vertically through the waler (101) of the rectangular foundation pit (200) and is locked and fixed to the waler (101) by the nut.

8. The external support structure for the foundation pit according to claim 6 or 7, characterized in that: The external support member (1) of the foundation pit is in the form of a circular ring or an elliptical ring structure, and the external support member (1) of the foundation pit is arranged concentrically with the rectangular foundation pit (200). Several fixed connecting members (2) are arranged at intervals along the circumference of the rectangular foundation pit (200).

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