Umbrella type foundation pit supporting structure

Abstract

The utility model discloses an umbrella type foundation pit supporting structure. The supporting structure comprises an enclosure retaining wall, a plurality of umbrella-shaped supports and a plurality of angle brace supports, each umbrella-shaped support comprises a partition retaining wall and two first supporting pieces, one end of each partition retaining wall is connected with the inner wall of the enclosure retaining wall, the partition retaining walls are evenly distributed on the edge of the inner side of the enclosure retaining wall, and the two first supporting pieces are symmetrically distributed on the left side and the right side of each partition retaining wall. The first supporting piece is connected with the dividing retaining wall and the enclosure retaining wall, the angle brace support is installed at the internal corner of the enclosure retaining wall and comprises a second supporting piece, and stand column piles are installed on the bottom end face of the first supporting piece and the bottom end face of the second supporting piece. The utility model has the beneficial effects that the construction sequence is adjustable, the disturbance to the soil outside the wall is small, and the supporting structure is safe and stable.

Description

Technical Field

[0001] The utility model relates to the technical field related to foundation pit construction, in particular to an umbrella-type foundation pit supporting structure. Background Art

[0002] In the foundation pit engineering projects of the first-floor basement in soft soil areas, there are often high requirements for the protection of the surrounding environment of the project. The foundation pit occupies a large area, and it is necessary to adopt the foundation pit support method such as pile row + horizontal support, which has high safety, good reliability and good deformation control effect. However, the conventional pile row and horizontal support support methods often have a large support coverage area, a long support span, a large amount of engineering, and a high cost. In addition, the support needs to be removed after the large area of ​​the basement floor is completed, causing the construction progress of the main building to lag behind, seriously affecting the development and construction of the real estate project. If other foundation pit support methods are used, such as double-row piles, pile rows + inclined support, gravity retaining wall, pile row + anchor cable and other support methods, they often cannot meet the requirements of foundation pit deformation control. Once the foundation pit deformation is out of control, it may cause settlement damage to surrounding buildings and structures.

[0003] Chinese Patent Authorization Announcement Number: CN220927882U, authorization announcement date May 10, 2024, discloses a foundation pit support mechanism for building construction, including a frame-type continuous wall and a mesh internal support assembly arranged in the continuous wall, the continuous wall portion is embedded in the ground and extends upward; a plurality of groups of anchor piles are evenly arranged in the continuous wall; the mesh internal support assembly includes a plurality of groups of parallel first internal supports, and a plurality of groups of parallel second internal supports connecting the first internal supports in pairs; the anchor pile includes an anchor rod body as a main body, an anchor head located above the anchor rod body and a drill bit located below the anchor rod body, the anchor head, the anchor rod body and the drill bit are an integrated structure, wherein the anchor head and the anchor rod body are hollow rod bodies, and the drill bit is a solid rod body; a connecting rod is arranged at the angle of the continuous wall, and the connecting rod and the angle of the continuous wall form a triangle. The shortcoming of this utility model is that although the combination of continuous wall + mesh internal support assembly + anchor piles can improve the deformation of the foundation pit and strengthen the strength of the foundation pit support, it does not solve the shortcoming of the existing technology that the fixed construction sequence cannot meet the project development sequence and construction progress requirements, and lacks flexibility. Utility Model Content

[0004] The utility model aims to overcome the deficiency in the prior art that the project development sequence and construction progress requirements cannot be met due to the fixed construction sequence, and provides an umbrella-shaped foundation pit supporting structure with adjustable construction sequence.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An umbrella-shaped foundation pit support structure comprises a retaining wall, a plurality of umbrella-shaped supports and a plurality of angle brace supports, wherein the umbrella-shaped support comprises a partition retaining wall and two support members 1, one end of the partition retaining wall is connected to the inner wall of the retaining wall, the partition retaining wall is evenly distributed at the inner edge of the retaining wall, two support members 1 are respectively arranged on the left and right sides of the partition retaining wall, the support member 1 is respectively connected to the partition retaining wall and the retaining wall, the angle brace support is installed at the inner corner of the retaining wall, the angle brace support comprises a support member 2, and column piles are installed on the bottom end surface of the support member 1 and the bottom end surface of the support member 2.

[0007] Among them, the retaining wall and the partition retaining wall are composed of a number of cast piles. First, before the excavation of the foundation pit, the retaining wall is drilled and cast at the outer edge of the foundation pit, and the partition retaining wall of the umbrella support is drilled and cast at the inner edge of the retaining wall. One end of the partition retaining wall is connected to the inner wall of the retaining wall. The retaining wall can adopt the bored cast-in-place piles in the existing technology combined with the mixing pile water-stop curtain, mixing pile plug-in steel, etc., and then locate the column piles under the support member 1 and the column piles under the support member 2, and complete the drilling and casting at the column piles under the support member 1 and the column piles under the support member 2. Then, the construction area is divided according to the number of partition retaining walls and the number of inner corners of the retaining wall, and the construction is completed according to the project development sequence and construction progress. It is requested to select the construction area where one of the divided retaining walls belongs for priority construction, and the soil on one side of the divided retaining wall should be initially excavated, and then the formwork should be supported to cast the support member 1 on one side. After complete excavation, the basement floor should be constructed. After the floor on one side is completed, the soil on the other side of the divided retaining wall should be initially excavated, and then the formwork should be supported to cast the support member 1 on the other side. After complete excavation, the basement floor should be constructed. At the same time, the corner brace support at the inner corner of the retaining wall can be used for excavating the soil while the umbrella support is being constructed, and then the formwork should be supported to cast the support member 2. After complete excavation, the basement floor should be constructed. The specific construction sequence can be adjusted according to the project development sequence and construction progress requirements, thereby achieving the purpose of adjustable construction sequence.

[0008] Preferably, the support member 1 includes a plurality of angle braces 1 and a plurality of horizontal braces 1, the angle braces 1 are evenly distributed on the left and right sides of the dividing retaining wall, and the plurality of angle braces 1 located on the same side of the dividing retaining wall are arranged parallel to each other, one end of the angle brace 1 is connected to the enclosing retaining wall, and the other end of the angle brace 1 is connected to the dividing retaining wall, and the shape of the horizontal brace 1 is L-shaped, and the horizontal brace 1 is evenly distributed between two adjacent parallel angle braces 1, both ends of the horizontal brace 1 are connected to one of the angle braces 1, and the L-shaped turning point of the horizontal brace 1 is connected to the other angle brace 1, and the shape of the area enclosed by the horizontal brace 1 and the angle brace 1 is an equilateral triangle. One end of angle brace one is connected to the retaining wall, and the other end of angle brace one is connected to the dividing retaining wall, so as to disperse and transfer the soil pressure to the dividing retaining wall to reduce the overturning pressure of the soil on the retaining wall. The shape of horizontal brace one is L-shaped, and the two ends of the L-shape are connected to one of the angle braces one, and the turning point of the L-shape is connected to another angle brace one, so as to further shorten the load-bearing section of angle brace one, reduce the bending moment and torque on angle brace one, and reduce the flexural deformation on angle brace one, thereby reducing the possibility of disturbance of the soil outside the retaining wall and ensuring the stability of the foundation pit, thereby achieving the purpose of small disturbance to the soil outside the wall and strong stability of the foundation pit.

[0009] Preferably, the support member 2 includes a plurality of corner braces 2 and a plurality of horizontal braces 2, the corner braces 2 are evenly and parallelly installed at the inner corners of the retaining wall, the horizontal braces 2 are L-shaped, the horizontal braces 2 are evenly distributed between two adjacent parallel corner braces 2, both ends of the horizontal brace 2 are connected to one of the corner braces 2, the L-shaped turning point of the horizontal brace 1 is connected to the other corner brace 2, and the shape enclosed by the horizontal brace 2 and the corner brace 2 is an equilateral triangle. Corner braces 2 are evenly installed at the inner corners of the retaining wall to disperse the soil pressure and improve the overall strength of the inner corners of the retaining wall. The shape of the horizontal brace 2 is L-shaped. The two ends of the horizontal brace 2 are connected to one of the corner braces 2, and the L-shaped turning point of the horizontal brace 2 is connected to the other corner brace 2, which further shortens the load-bearing section of the corner brace 2, reduces the bending moment and torque on the corner brace 2, and reduces the flexural deformation generated on the corner brace 2, thereby reducing the possibility of disturbance of the soil outside the retaining wall and ensuring the stability of the foundation pit, thereby achieving the purpose of small disturbance to the soil outside the wall and strong stability of the foundation pit.

[0010] Preferably, the support member 1 and the support member 2 are both provided with a plurality of armpit corner blocks, the cross-section of the armpit corner blocks is triangular, and the armpit corner blocks are respectively fitted with the L-shaped turning point of the horizontal support 1, the L-shaped turning point of the horizontal support 2, the angle between the end of the horizontal support 1 and the angle support 1, the angle between the end of the horizontal support 2 and the angle support 2, the angle between the angle support 1 and the partition retaining wall, the angle between the angle support 1 and the enclosure retaining wall, and the angle between the angle support 2 and the enclosure retaining wall. Both the umbrella support and the angle support support bear the pressure and bending moment deformation brought by the soil. The rotation angle and shear force are relatively large at the intersection of each component. The armpit corner blocks increase the force-bearing area and effectively avoid structural damage at the intersection.

[0011] Preferably, a plurality of anchor rods are provided on the retaining wall, one end of the anchor rod passes through the retaining wall, and a fixing piece is provided on the other end of the anchor rod, and the anchor rod is connected to the retaining wall through the fixing piece. One end of the anchor rod passes through the retaining wall and is placed in the soil. After the anchor rod is prestressed, concrete is poured around the end of the anchor rod placed in the soil, and a fixing piece is tightened on the end placed outside the soil. The fixing piece can be any anchor rod supporting equipment in the prior art, such as a bolt, so that the anchor rod is fixed to the soil. The soil is not easy to loosen and collapse due to the contraction of the prestress applied to the anchor rod, and the fixing piece provided on the other end further pulls the retaining wall to prevent the collapse of the retaining wall.

[0012] Preferably, the upper ends of the column piles are connected to the lower end faces of the first angle support and the second angle support, and the column piles are respectively placed at the lower ends of the L-shaped turning points of the first horizontal support and the second horizontal support. The column piles are respectively placed at the lower ends of the L-shaped turning points of the first horizontal support and the second horizontal support, shortening the lengths of the first angle support and the second angle support, thereby reducing the bending deformation of the first angle support and the second angle support.

[0013] Preferably, a fixing ring is mounted on the outer surface of the column pile, and a plurality of anti-pulling anchor ropes are arranged on the fixing ring, and the anti-pulling anchor ropes are evenly distributed at the outer edge of the fixing ring, one end of the anti-pulling anchor rope is connected to the fixing ring, and a tension adjustment piece is arranged on the anti-pulling anchor rope. The soil in the foundation pit will generate a certain amount of buoyancy after being soaked by rainwater, thereby pushing the column pile out of the soil and destroying the structural stability of the umbrella support and the angle support, drilling holes at the bottom of the foundation pit to insert the anti-pulling anchor rope into the holes, and filling and pouring concrete around the part where the anti-pulling anchor rope is placed in the soil to fix it, shortening and tightening the anti-pulling anchor rope through the tension adjustment piece, and the tension adjustment piece can be any wire fastener in the prior art, such as a basket bolt, and then the fixing ring mounted on the column pile and the anti-pulling anchor rope connected to the fixing ring can pull the column pile downward to offset the buoyancy of the soil, so that the column pile will not be pulled up by the buoyancy of the soil, ensuring the safety and stability of the support structure and avoiding the collapse of the side wall of the foundation pit.

[0014] The beneficial effects of the utility model are: the construction sequence is adjustable; the disturbance to the soil outside the wall is small and the foundation pit is stable; structural damage at the intersection is avoided; the collapse of the retaining wall is effectively avoided; the bending of the corner brace is reduced; the deformed column piles will not be pulled up by the buoyancy of the soil, avoiding the damage and collapse of the side wall of the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0017] Figure 3 It is a structural diagram of umbrella support;

[0018] Figure 4 It is a structural diagram of angle bracing support;

[0019] Figure 5 It is a structural schematic diagram of the connection between the anchor rod and the retaining wall;

[0020] Figure 6 It is a schematic diagram of the structure of the fixing ring and the anti-pulling anchor rope.

[0021] In the figure: 1. retaining wall, 2. umbrella support, 3. angle support, 4. column pile, 5. partition retaining wall, 6. support member 1, 7. support member 2, 8. angle support 1, 9. horizontal support 1, 10. angle support 2, 11. horizontal support 2, 12. axilla block, 13. anchor rod, 14. fixing member, 15. fixing ring, 16. anti-pullout anchor rope, 17. tension adjustment member. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1 and Figure 2 In the described embodiment, an umbrella-type foundation pit support structure includes a retaining wall 1, a plurality of umbrella-shaped supports 2 and a plurality of angle bracing supports 3. The umbrella-shaped support 2 includes a partitioning retaining wall 5 and two supporting members 6. One end of the partitioning retaining wall 5 is connected to the inner wall of the retaining retaining wall 1. The partitioning retaining wall 5 is evenly distributed at the inner edge of the retaining retaining wall 1. The two supporting members 6 are symmetrically distributed on the left and right sides of the partitioning retaining wall 5. The supporting member 1 6 is respectively connected to the partitioning retaining wall 5 and the retaining retaining wall 1. The angle bracing support 3 is installed at the inner corner of the retaining retaining wall 1. The angle bracing support 3 includes a supporting member 2 7. The bottom end surface of the supporting member 1 6 and the bottom end surface of the supporting member 2 7 are both installed with column piles 4.

[0024] like Figure 3As shown, the support member 6 includes a plurality of angle supports 8 and a plurality of horizontal supports 9. The angle supports 8 are evenly distributed on the left and right sides of the partition retaining wall 5. The angle supports 8 on the same side of the partition retaining wall 5 are arranged parallel to each other. One end of the angle support 8 is connected to the enclosing retaining wall 1, and the other end of the angle support 8 is connected to the partition retaining wall 5. The shape of the horizontal support 9 is L-shaped. The horizontal support 9 is evenly distributed between two adjacent parallel angle supports 8. Both ends of the horizontal support 9 are connected to one of the angle supports 8. The L-shaped turning point of the horizontal support 9 is connected to another angle support 8. The shape of the area enclosed by the horizontal support 9 and the angle support 8 is an equilateral triangle.

[0025] like Figure 4 As shown, the support member 27 includes a plurality of corner braces 20 and a plurality of horizontal braces 21. The corner braces 210 are evenly and parallelly installed at the inner corners of the retaining wall 1. The horizontal braces 21 are L-shaped. The horizontal braces 21 are evenly distributed between two adjacent parallel corner braces 210. Both ends of the horizontal brace 21 are connected to one of the corner braces 210. The L-shaped turning point of the horizontal brace 11 is connected to the other corner brace 210. The shape formed by the horizontal brace 21 and the corner brace 210 is an equilateral triangle.

[0026] like Figure 3 and Figure 4 As shown, support member 1 6 and support member 2 7 are both provided with a plurality of armpit corner blocks 12, the cross-sectional shape of the armpit corner blocks 12 is triangular, and the armpit corner blocks 12 are respectively fitted with the L-shaped turning point of horizontal support 1 9, the L-shaped turning point of horizontal support 2 11, the angle between the end of horizontal support 1 9 and angle support 1 8, the angle between the end of horizontal support 2 11 and angle support 2 10, the angle between angle support 1 8 and the dividing retaining wall 5, the angle between angle support 1 8 and the enclosing retaining wall 1, and the angle between angle support 2 10 and the enclosing retaining wall 1.

[0027] like Figure 5 As shown, a plurality of anchor rods 13 are provided on the retaining wall 1 , one end of the anchor rod 13 passes through the retaining wall 1 , and a fixing piece 14 is provided on the other end of the anchor rod 13 , and the anchor rod 13 is connected to the retaining wall 1 via the fixing piece 14 .

[0028] like Figure 1 As shown, the upper ends of the column piles 4 are respectively connected to the lower end surfaces of the angle brace 1 8 and the lower end surfaces of the angle brace 2 10, and the column piles 4 are respectively placed at the lower ends of the L-shaped turning points of the horizontal brace 1 9 and the lower ends of the L-shaped turning points of the horizontal brace 2 11.

[0029] like Figure 6 As shown, a fixing ring 15 is mounted on the outer side of the column pile 4, and a plurality of anti-pullout anchor ropes 16 are arranged on the fixing ring 15. The anti-pullout anchor ropes 16 are evenly distributed at the outer edge of the fixing ring 15, and one end of the anti-pullout anchor rope 16 is connected to the fixing ring 15, and a tension adjustment piece 17 is arranged on the anti-pullout anchor rope 16.

[0030] During the construction process, the construction area is first divided according to the building locations determined by the developer and the order of project development. Then, at the edge of the foundation pit, the bored cast-in-place piles in combination with the mixing piles, water-stop curtains or the mixing piles with inserted steel are used to construct and cast the retaining wall 1. In the blocks close to the edge of the foundation pit and not in the dark corners of the foundation pit, the bored cast-in-place piles in combination with the mixing piles, water-stop curtains or the mixing piles with inserted steel are used to construct and cast the dividing retaining wall 5. One end of the dividing retaining wall 5 is connected to the inner side of the retaining wall 1. Then, the column piles 4 are driven and cast at the column pile positions determined in the construction drawings of each construction block.

[0031] After the construction of the column piles 4 is completed, the order of the construction blocks is determined according to the development order, and the construction is carried out in sequence according to these steps. First, the soil on one side of the left and right sides of the dividing retaining wall 5 in the block is preliminarily excavated, and holes are drilled on the retaining retaining wall 1. The anchor rod 13 is passed through the retaining retaining wall 1 and then inserted into the soil on the rear side of the retaining retaining wall 1, and the anchor rod 13 is prestressed. Then, concrete is filled and poured, and further reinforced through the fixing parts 14 in the prior art, so that the anchor rod 13 is in full contact with the soil. The soil on the rear side of the retaining retaining wall 1 is tightened by prestressing, and the formwork is supported to cast the support member 6. Then, the basement floor is cast after the complete excavation. After the construction of one side of the basement is completed, the soil on the other side of the dividing retaining wall 5 can be preliminarily excavated. Holes are drilled on the retaining retaining wall 1, and the anchor rod 13 is passed through the retaining retaining wall 1 and then inserted into the soil on the rear side of the retaining retaining wall 1. The anchor rod is prestressed. 13 is prestressed, and then filled with concrete and further reinforced by the fixing parts 14 in the prior art, so that the anchor rod 13 is in full contact with the soil, and the soil on the rear side of the retaining wall 1 is tightened by prestressing, and the formwork is supported to cast the support member 6, and then the basement floor is cast after complete excavation; the angle support 3 on the negative angle area of ​​the retaining wall 1 can be constructed simultaneously with the construction of the umbrella support 2. After the preliminary excavation of the soil, a hole is drilled on the retaining wall 1, and the anchor rod 13 is passed through the retaining wall 1 and then inserted into the soil on the rear side of the retaining wall 1, and the anchor rod 13 is prestressed, and then filled with concrete and further reinforced by the fixing parts 14 in the prior art, so that the anchor rod 13 is in full contact with the soil, and the soil on the rear side of the retaining wall 1 is tightened by prestressing, and the formwork is supported to cast the support member 2 7, and then the basement floor is cast after complete excavation.

[0032] Before pouring the floor, a fixing ring 15 can be installed at the lower end of the column pile 4, and then the anti-pullout anchor rope 16 on the fixing ring 15 is inserted into the foundation pit soil, and the part where the anti-pullout anchor rope 16 is inserted into the soil is filled with concrete, so that the anti-pullout anchor rope 16 is in closer contact with the soil. By tightening the anti-pullout anchor rope 16 through the tension adjustment piece 17 in the prior art, the column pile 4 can be prevented from being pulled up by the buoyancy of the liquid in the soil.

Claims

1. An umbrella-type foundation pit support structure, characterized in that: The invention comprises a retaining wall (1), a plurality of umbrella-shaped supports (2) and a plurality of angle brace supports (3), wherein the umbrella-shaped supports (2) comprise a partitioning retaining wall (5) and two support members (6), one end of the partitioning retaining wall (5) is connected to the inner wall of the retaining wall (1), the partitioning retaining wall (5) is evenly distributed at the inner edge of the retaining wall (1), the two support members (6) are symmetrically distributed on the left and right sides of the partitioning retaining wall (5), the support member (6) is respectively connected to the partitioning retaining wall (5) and the retaining wall (1), the angle brace supports (3) are installed at the inner corners of the retaining wall (1), the angle brace supports (3) comprise support members (7), and column piles (4) are installed on the bottom end surfaces of the support members (1) and the bottom end surfaces of the support members (7).

2. The umbrella-shaped foundation pit support structure according to claim 1 is characterized in that: The support member 1 (6) comprises a plurality of angle braces 1 (8) and a plurality of horizontal braces 1 (9), wherein the angle braces 1 (8) are evenly distributed on the left and right sides of the partition retaining wall (5), and the angle braces 1 (8) on the same side of the partition retaining wall (5) are arranged parallel to each other, one end of the angle brace 1 (8) is connected to the enclosure retaining wall (1), and the other end of the angle brace 1 (8) is connected to the partition retaining wall (5), and the horizontal brace 1 (9) is L-shaped, and the horizontal brace 1 (9) is evenly distributed between two adjacent parallel angle braces 1 (8), both ends of the horizontal brace 1 (9) are connected to one of the angle braces 1 (8), and the L-shaped turning point of the horizontal brace 1 (9) is connected to the other angle brace 1 (8), and the shape of the area enclosed by the horizontal brace 1 (9) and the angle brace 1 (8) is an equilateral triangle.

3. The umbrella-shaped foundation pit support structure according to claim 2 is characterized in that: The support member 2 (7) comprises a plurality of angle braces 2 (10) and a plurality of horizontal braces 2 (11). The angle braces 2 (10) are evenly and mutually parallelly installed at the inner corners of the retaining wall (1). The horizontal braces 2 (11) are L-shaped. The horizontal braces 2 (11) are evenly distributed between two adjacent mutually parallel angle braces 2 (10). Both ends of the horizontal brace 2 (11) are connected to one of the angle braces 2 (10). The L-shaped turning point of the horizontal brace 1 (9) is connected to another angle brace 2 (10). The shape enclosed by the horizontal brace 2 (11) and the angle brace 2 (10) is an equilateral triangle.

4. The umbrella-shaped foundation pit support structure according to claim 3 is characterized in that: The support member 1 (6) and the support member 2 (7) are both provided with a plurality of armpit corner blocks (12), the cross-section of the armpit corner blocks (12) being triangular in shape, and the armpit corner blocks (12) are respectively fitted with the L-shaped turning point of the horizontal support 1 (9), the L-shaped turning point of the horizontal support 2 (11), the angle between the end of the horizontal support 1 (9) and the angle support 1 (8), the angle between the end of the horizontal support 2 (11) and the angle support 2 (10), the angle between the angle support 1 (8) and the partition retaining wall (5), the angle between the angle support 1 (8) and the enclosure retaining wall (1), and the angle between the angle support 2 (10) and the enclosure retaining wall (1).

5. The umbrella-shaped foundation pit support structure according to claim 1 is characterized in that: A plurality of anchor rods (13) are provided on the retaining wall (1), one end of each anchor rod (13) passes through the retaining wall (1), a fixing piece (14) is provided on the other end of each anchor rod (13), and the anchor rod (13) is connected to the retaining wall (1) via the fixing piece (14).

6. The umbrella-shaped foundation pit support structure according to claim 3 is characterized in that: The upper ends of the column piles (4) are respectively connected to the lower end surfaces of the first angle brace (8) and the second angle brace (10), and the column piles (4) are respectively placed at the lower ends of the L-shaped turning points of the first horizontal brace (9) and the second horizontal brace (11).

7. An umbrella-shaped foundation pit support structure according to claim 1 or 6, characterized in that: A fixing ring (15) is sleeved on the outer side of the column pile (4), and a plurality of anti-pullout anchor ropes (16) are provided on the fixing ring (15). The anti-pullout anchor ropes (16) are evenly distributed at the outer edge of the fixing ring (15), one end of the anti-pullout anchor rope (16) is connected to the fixing ring (15), and a tension adjustment member (17) is provided on the anti-pullout anchor rope (16).

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