Foundation pit supporting structure with hidden support at pit bottom

Abstract

The utility model relates to the technical field of foundation pit supporting, in particular to a pit bottom hidden support foundation pit supporting structure which comprises hidden supports, a plurality of first foundation pits and a plurality of second foundation pits. And the inclined struts are arranged between the adjacent hidden supports, the two ends of each inclined strut are fixedly connected with the corresponding hidden supports correspondingly, and the multiple engineering piles are inserted into the inner bottom wall of the first foundation pit. According to the construction method, the situation of collapse occurring when the second foundation pit is excavated is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of foundation pit support, and in particular to a foundation pit support structure with hidden support at the bottom of the pit. Background Art

[0002] With the continuous development of underground space, more and more foundation pit projects have emerged. At present, it is becoming more and more common for the excavation depth of foundation pit projects to reach 20 to 30 meters. The support of foundation pits has also become an issue that needs to be focused on at present.

[0003] After the vertical support structure of the foundation pit (bored cast-in-place piles) has been constructed, the foundation pit is deepened or a local pit-in-pit excavation is performed. At this time, due to the adjustment of the foundation pit depth, the pit-in-pit cannot be supported by the original support structure, resulting in the originally designed foundation pit support structure being unable to meet the requirements of the adjusted foundation pit, and the pit-in-pit collapse is likely to occur. Summary of the invention

[0004] The purpose of the present application is to provide a pit bottom concealed support foundation pit support structure, which can reduce the occurrence of collapse when digging a second foundation pit.

[0005] The present application provides a pit bottom concealed support foundation pit support structure adopts the following technical solution:

[0006] A pit bottom concealed support foundation pit support structure comprises:

[0007] Concealed support: a concealed support is installed on the inner wall of each first foundation pit;

[0008] An oblique brace is provided between adjacent concealed braces, and both ends of the oblique brace are respectively fixedly connected to the corresponding concealed brace;

[0009] A plurality of engineering piles are provided, and the plurality of engineering piles are all inserted into the bottom wall of the first foundation pit.

[0010] By adopting the above technical solution, when the second foundation pit is opened on the first foundation pit, the overall depth of the entire foundation pit increases, and the original engineering piles cannot meet the requirements of the adjusted foundation pit. At this time, hidden supports are fixed on the inner wall of the first foundation pit, and adjacent hidden supports are connected to each other through diagonal supports, so that the diagonal supports support the adjacent hidden supports, that is, support the inner wall of the first foundation pit, thereby reducing the collapse of the first foundation pit and the second foundation pit, and increasing the stability of the first foundation pit and the second foundation pit.

[0011] Optionally, a plurality of diagonal braces are provided between adjacent concealed braces.

[0012] By adopting the above technical solution and setting a plurality of diagonal braces, it is possible to support different positions of the inner wall of the first foundation pit, thereby further increasing the support stability of the first foundation pit and the second foundation pit, and further reducing the occurrence of collapse of the first foundation pit and the second foundation pit.

[0013] Optionally, the plurality of diagonal braces between adjacent concealed braces are evenly spaced and distributed.

[0014] By adopting the above technical solution, the evenly spaced distribution of the diagonal braces can effectively balance the load on the structure, transfer the load to various parts of the supporting structure, reduce the structural stress concentration phenomenon that may be caused by local loads, and improve the stability and safety of the structure. The evenly spaced distribution of the diagonal braces can effectively control the deformation of the first foundation pit and the second foundation pit. By applying a relatively uniform support force at various locations of the structure, the deformation of the first foundation pit and the second foundation pit caused by external loads is reduced, and the stability of the first foundation pit and the second foundation pit is ensured.

[0015] Optionally, an isolation piece is provided between the diagonal brace and the adjacent engineering pile, and the isolation piece is sleeved on the engineering pile and provided between the diagonal brace and the engineering pile for separating the diagonal brace from the engineering pile.

[0016] By adopting the above technical solution and setting up isolation pieces, the diagonal brace and the engineering pile are isolated from each other, thereby reducing the situation where the force on the diagonal brace is transferred to the engineering pile, thereby reducing the influence of the diagonal brace on the engineering pile and maintaining the stability of the engineering pile.

[0017] Optionally, the isolation element is made of felt.

[0018] By adopting the above technical solution, the use of felt can prevent the adhesion between the diagonal braces and the engineering piles, and maintain the independence of each.

[0019] Optionally, adjacent concealed supports are connected to each other.

[0020] By adopting the above technical solution, adjacent hidden supports are connected to each other, so that multiple hidden supports form a whole, the force between the hidden supports is more uniform, and the supporting effect on the first foundation pit and the second foundation pit is further increased.

[0021] Optionally, the concealed support is made of reinforced concrete.

[0022] By adopting the above technical solution, the concealed support is made of reinforced concrete, which can be cast on site and convenient for on-site installation. In addition, the reinforced concrete has high strength and can provide excellent bearing capacity and structural stability. The reinforced concrete also has good high temperature resistance and corrosion resistance, and is suitable for use in foundation pits.

[0023] Optionally, the diagonal brace is made of reinforced concrete.

[0024] By adopting the above technical solution, the diagonal brace is made of reinforced concrete, which can be cast on site and is convenient for on-site installation. In addition, the reinforced concrete has high strength and can provide excellent bearing capacity and structural stability. The reinforced concrete also has good high temperature resistance and corrosion resistance, and is suitable for use in foundation pits.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. When the second foundation pit is opened on the first foundation pit, the overall depth of the entire foundation pit increases, and the original engineering piles cannot meet the requirements of the adjusted foundation pit. At this time, a hidden support is fixed on the inner wall of the first foundation pit, and adjacent hidden supports are connected to each other through diagonal supports, so that the diagonal supports support adjacent hidden supports, that is, support the inner wall of the first foundation pit, thereby reducing the collapse of the first foundation pit and the second foundation pit, and increasing the stability of the first foundation pit and the second foundation pit;

[0027] 2. The evenly spaced distribution of diagonal braces can effectively balance the load on the structure, transfer the load to various parts of the supporting structure, reduce the structural stress concentration phenomenon that may be caused by local loads, and improve the stability and safety of the structure. The evenly spaced distribution of diagonal braces can effectively control the deformation of the first foundation pit and the second foundation pit. By applying relatively uniform support force at various locations of the structure, the deformation of the first foundation pit and the second foundation pit caused by external loads is reduced, ensuring the stability of the first foundation pit and the second foundation pit;

[0028] 3. By setting up isolation pieces, the diagonal braces and engineering piles are isolated from each other, thereby reducing the situation where the force on the diagonal braces is transferred to the engineering piles, thereby reducing the influence of the diagonal braces on the engineering piles and maintaining the stability of the engineering piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of a pit bottom concealed support foundation pit support structure according to an embodiment of the present application.

[0030] Figure 2 It is a partial structural schematic diagram used to reflect the positional connection relationship between the engineering piles and the diagonal braces in the embodiment of the present application.

[0031] In the figure, 1, the first foundation pit; 2, the second foundation pit; 3, the hidden support; 4, the diagonal support; 5, the isolation piece; 6, the empty groove; 7, the gap; 8, the engineering pile. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 -Attached Figure 2 , further details of this application are given.

[0033] Reference Figure 1 A first foundation pit 1 is opened on the ground, and a second foundation pit 2 is opened on the bottom wall of the first foundation pit 1 to increase the depth of the overall foundation pit and is suitable for different construction scenarios. The second foundation pit 2 can have the same area as the first foundation pit 1, that is, the second foundation pit 2 is a foundation pit formed by extending the depth of the first foundation pit 1. The area of ​​the second foundation pit 2 can also be smaller than that of the first foundation pit 1, that is, a new foundation pit is opened on the bottom wall of the first foundation pit 1.

[0034] A pit bottom concealed support foundation pit support structure, refer to Figure 1 , including engineering piles 8, a plurality of engineering piles 8 are provided, and the plurality of engineering piles 8 are evenly distributed on the inner bottom wall of the first foundation pit 1 and inserted into the inner bottom wall of the first foundation pit 1. In this embodiment, the engineering piles 8 are made of reinforced concrete and driven into the ground using a pile driver. The upper structure is supported by providing the engineering piles 8.

[0035] A pit bottom hidden support foundation pit support structure also includes hidden supports 3 and diagonal supports 4. The above-mentioned hidden supports 3 are arranged on each inner wall of the first foundation pit 1, and a plurality of diagonal supports 4 are arranged between adjacent hidden supports 3. The two ends of each diagonal support 4 are respectively fixedly connected to the adjacent hidden supports 3. Through the arrangement of the hidden supports 3 and the diagonal supports 4, the first foundation pit 1 is supported, thereby increasing the stability of the entire first foundation pit 1 and the second foundation pit 2, and reducing the collapse of the first foundation pit 1 and the second foundation pit 2 due to the start of the second foundation pit 2.

[0036] Specifically, when the hidden support 3 is manufactured and installed, a segmented casting method is adopted. The inner wall of the first foundation pit 1 is segmentedly grooved. First, an empty groove 6 is opened, and concrete is poured in the empty groove 6 to form a partial hidden support 3. When this part of the concrete solidifies, another empty groove 6 is opened, and concrete is continued to be poured to form a partial hidden support 3. According to the above steps, multiple sections of grooving are performed to form multiple sections of partial hidden supports 3. The multiple sections of partial hidden supports 3 are connected in sequence to form a completed hidden support 3.

[0037] Furthermore, adjacent concealed supports 3 are fixedly connected to each other through concrete, so that several concealed supports 3 form a whole, thereby increasing the stability of the concealed supports 3 and thus increasing the support for the first foundation pit 1.

[0038] Specifically, during the manufacturing process of the diagonal brace 4, a casting trough for casting the diagonal brace 4 is firstly opened on the bottom wall of the first foundation pit 1, and the two ends of the casting trough are respectively connected to the empty groove 6 where the adjacent hidden brace 3 is located, and concrete is poured in the casting trough, so that the concrete solidifies to form the above-mentioned diagonal brace 4, and the diagonal brace 4 and the hidden brace 3 are connected and fixed to each other by concrete. In other embodiments, the diagonal brace 4 can be made of steel pipes or steel frames, and the two ends of the diagonal brace 4 are fixedly connected to the hidden brace 3 by bolts, so that the diagonal brace 4 supports the hidden brace 3, that is, supports the inner wall of the first foundation pit 1, and ensures the stability of the first foundation pit 1 and the second foundation pit 2.

[0039] Furthermore, the number of diagonal braces 4 between adjacent hidden braces 3 is set to be several. By setting multiple diagonal braces 4, the supporting force for the first foundation pit 1 and the second foundation pit 2 is increased, and the several diagonal braces 4 between adjacent hidden braces 3 are evenly spaced and distributed.

[0040] Reference Figure 2 Furthermore, during the manufacturing process of the diagonal brace 4, the position of the diagonal brace 4 may overlap with the position of the engineering pile 8. At this time, the isolation piece 5 is wrapped on the engineering pile 8, and then the diagonal brace 4 is cast. When the diagonal brace 4 solidifies, a notch 7 is formed on the diagonal brace 4, and the notch 7 is adapted to the shape of the engineering pile 8. At this time, the isolation piece 5 is between the diagonal brace 4 and the engineering pile 8, so that the diagonal brace 4 and the engineering pile 8 are separated from each other, so that when the diagonal brace 4 is subjected to force, it is not easy to transmit to the engineering pile 8, reducing the impact on the engineering pile 8. In the present application, the isolation piece 5 is made of linoleum felt, which is a low-compression linoleum felt. The engineering pile 8 is wrapped with the linoleum felt, so that the diagonal brace 4 and the engineering pile 8 are separated from each other, thereby reducing the impact of the diagonal brace 4 on the engineering pile 8. In other embodiments, the isolation piece 5 can also be made of other materials, as long as the mutual isolation between the engineering pile 8 and the diagonal brace 4 is guaranteed.

[0041] Specifically, when a portion of the engineering pile 8 overlaps with the diagonal brace 4, the engineering pile 8 should be wrapped when the diagonal brace 4 is cast, and it should be ensured that the net cross-section of the diagonal brace 4 is not weakened.

[0042] The implementation principle of the embodiment of the present application is: when it is necessary to continue to open the second foundation pit 2 in the first foundation pit 1, first cast the first foundation pit 1 from the side wall to form a hidden support 3, and then cast the bottom wall of the first foundation pit 1 to form an inclined support 4. When the inclined support 4 and the hidden support 3 are completed, start excavating the second foundation pit 2 to ensure the stability of the first foundation pit 1 and the second foundation pit 2 and reduce the occurrence of collapse of the first foundation pit 1 and the second foundation pit 2.

[0043] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pit bottom hidden support foundation pit support structure, characterized in that: include: Concealed support (3), one concealed support (3) is installed on the inner wall of each first foundation pit (1); An oblique brace (4), wherein an oblique brace (4) is arranged between adjacent concealed braces (3), and both ends of the oblique brace (4) are respectively fixedly connected to the corresponding concealed brace (3); A plurality of engineering piles (8) are provided, and the plurality of engineering piles (8) are all inserted into the inner bottom wall of the first foundation pit (1).

2. A pit bottom hidden support foundation pit support structure according to claim 1, characterized in that: A plurality of the oblique braces (4) are provided between adjacent concealed braces (3).

3. A pit bottom hidden support foundation pit support structure according to claim 2, characterized in that: The plurality of diagonal braces (4) between adjacent concealed braces (3) are evenly spaced and distributed.

4. The pit bottom hidden support foundation pit support structure according to claim 1 is characterized in that: An isolation member (5) is provided between the diagonal brace (4) and the adjacent engineering pile (8); the isolation member (5) is sleeved on the engineering pile (8) and is provided between the diagonal brace (4) and the engineering pile (8) for separating the diagonal brace (4) from the engineering pile (8).

5. The pit bottom concealed support foundation pit support structure according to claim 4 is characterized in that: The isolation member (5) is made of felt.

6. The pit bottom hidden support foundation pit support structure according to claim 1 is characterized in that: Adjacent hidden supports (3) are connected to each other.

7. The pit bottom hidden support foundation pit support structure according to claim 1 is characterized in that: The concealed support (3) is made of reinforced concrete.

8. The pit bottom hidden support foundation pit support structure according to claim 1 is characterized in that: The diagonal brace (4) is made of reinforced concrete.

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