A foundation pit support structure

Abstract

The present invention relates to the field of construction engineering technology, and in particular, to a foundation pit support structure. The foundation pit support structure includes a plurality of auxiliary retaining piles and a plurality of steel supports; the plurality of auxiliary retaining piles are arranged on the side of the auxiliary foundation pit away from the main structure, and are arranged opposite to the main retaining piles; the steel supports are supported between the auxiliary retaining piles and the main secondary lining lintel of the main structure. The above-mentioned foundation pit support structure adopts the secondary lining lintel of the main structure as the internal fulcrum of the steel support, which ensures the force transmission balance of the steel support and solves the problem of erecting the steel support well; the above-mentioned foundation pit support structure has the advantages of clear force transmission, convenient construction, short construction period, low cost, and less impact on the surrounding environment.

Description

Technical Field

[0001] The present application relates to the field of construction engineering technology, and in particular, to a foundation pit support structure. Background Art

[0002] In urban rail transit projects, the open-cut station foundation pit usually adopts the form of retaining piles + steel support structure. When the foundation pit is deep, multiple steel supports need to be set up. The steel supports are erected on the waist beam, and the waist beam is supported on the retaining piles to ensure the force balance of the foundation pit. For the auxiliary foundation pit, the retaining piles between the main body of the station and the auxiliary structure are generally chiseled as they are dug. The auxiliary foundation pit is affected by the surrounding environment. For example, if there are nearby buildings (structures), and the foundation pit layout is parallel to the length of the station and is long and narrow, there will be a problem that the steel supports cannot be erected. It is necessary to adjust the steel support layout to ensure the force balance of the foundation pit.

[0003] In the prior art, for the subsidiary foundation pit arranged in a long and narrow shape parallel to the length of the station, the retaining piles between the station body and the subsidiary are dug as they are being excavated, and it is impossible to erect multiple steel supports. If external anchor cables are used, it will affect the surrounding buildings (structures). Therefore, there is an urgent need to provide a foundation pit support structure that can be used for the subsidiary foundation pit arranged in a long and narrow shape. Summary of the invention

[0004] The embodiment of the present application provides a foundation pit support structure that is easy to construct and has little impact on the surrounding environment, which solves the problem that steel supports for existing narrow and long subsidiary foundation pits cannot be erected.

[0005] The embodiment of the present application provides a foundation pit support structure, which includes a plurality of auxiliary retaining piles and a plurality of steel supports;

[0006] A plurality of said auxiliary retaining piles are arranged on a side of the auxiliary foundation pit away from the main structure and are arranged opposite to the main retaining piles;

[0007] The steel support is supported between the auxiliary retaining piles and the main secondary lining lintel of the main structure.

[0008] Preferably, the plurality of auxiliary retaining piles are evenly distributed along the length direction of the auxiliary foundation pit;

[0009] There is a one-to-one correspondence between the auxiliary guard piles and the steel supports.

[0010] Preferably, an auxiliary cap beam is provided on the top of the plurality of auxiliary guard piles;

[0011] The subsidiary crown beam and the plurality of subsidiary retaining piles form an integral structure.

[0012] Preferably, retaining walls are provided at the top of the subsidiary cap beam and between the subsidiary retaining piles.

[0013] Preferably, flanges are provided at both ends of the steel support;

[0014] Mounting seats are provided on the auxiliary guard piles and the main body secondary lining lintel, and the mounting seats are used to dock with the flange plate;

[0015] The flange is fixedly mounted on the mounting seat by bolts.

[0016] Preferably, a safety rope is provided at the end of the steel support;

[0017] A buckle for quickly connecting the safety rope is arranged on the mounting seat.

[0018] Preferably, a structural reinforcement is added in the second lining lintel of the main body to enhance its structural strength and rigidity.

[0019] Preferably, the structural reinforcement comprises a supporting steel plate, and the supporting steel plate is embedded in a side of the second lining beam of the main body facing the steel support.

[0020] Preferably, the structural reinforcement further comprises stirrups for resisting shear in horizontal and vertical directions.

[0021] Preferably, an upward flange is provided on the top of the second lining lintel of the main body.

[0022] The foundation pit support structure provided in the embodiment of the present application has the following beneficial effects:

[0023] In the above-mentioned foundation pit support structure, a plurality of auxiliary retaining piles are arranged on the outside of the auxiliary foundation pit, and the steel support is supported between the auxiliary retaining piles and the main secondary lining lintel of the main structure. The secondary lining lintel of the main structure is used as the internal fulcrum of the steel support, which ensures the force transmission balance of the steel support and solves the problem of erecting the steel support well. The steel support can effectively control the deformation of the foundation pit and the surface settlement, and protect the safety of the surrounding buildings (structures). Therefore, the above-mentioned foundation pit support structure has the advantages of clear force transmission, convenient construction, short construction period, low cost and less impact on the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 A schematic structural diagram of a foundation pit support structure provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1The structural diagram of the foundation pit support structure provided in the figure before the steel support is set;

[0027] Figure 3 This is a schematic diagram of the structure after the construction of the auxiliary structure is completed.

[0028] Reference numerals:

[0029] 1-Attached retaining piles; 2-Steel support; 3-Attached foundation pit; 4-Main retaining piles; 5-Main structure; 6-Main secondary lining lintel; 7-Attached crown beam; 8-Retaining wall; 9-Flange; 10-Surrounding buildings (structures); 11-Construction ground. DETAILED DESCRIPTION

[0030] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0031] The present application provides a foundation pit support structure, which can be applied in the construction process of urban rail transit projects. Figure 1 , Figure 2 and Figure 3 As shown in the structure, the foundation pit support structure includes a plurality of auxiliary retaining piles 1 and a plurality of steel supports 2; the plurality of auxiliary retaining piles 1 are arranged on the side of the auxiliary foundation pit 3 away from the main structure 5, and are arranged opposite to the main retaining piles 4; the steel supports 2 are supported between the auxiliary retaining piles 1 and the main secondary lining lintel 6 of the main structure 5. Figure 1 , Figure 2 and Figure 3As shown in the structure, due to the construction of the auxiliary structure connected to the main structure 5, it is necessary to excavate an auxiliary foundation pit 3 on one side of the main structure 5, and there are surrounding buildings (structures) 10 on one side of the excavation of the auxiliary foundation pit 3. Affected by the surrounding environment, the auxiliary foundation pit 3 is parallel to the length direction of the main structure 5 and is narrow and long in shape; before excavating the auxiliary foundation pit 3, in order to effectively control the deformation of the foundation pit and the surface settlement, ensure that the nearby surrounding buildings (structures) 10 are not affected, and ensure the safety of the construction, it is necessary to prepare a plurality of auxiliary retaining piles 1 in advance at the lower part of the construction ground 11. The auxiliary retaining piles 1 can be arranged opposite to the main retaining piles 4 during the construction of the main structure 5, and the narrow space between the main retaining piles 4 and the auxiliary retaining piles 1 is used to form the auxiliary foundation pit 3; along the length direction of the auxiliary foundation pit 3, the plurality of auxiliary retaining piles 1 are evenly distributed, that is, a plurality of auxiliary retaining piles 1 are arranged on the side of the auxiliary foundation pit 3 away from the main structure 5, and the intervals between the auxiliary retaining piles 1 are equal. In order to further improve the support stability and safety of the foundation pit support structure, the pile diameter of the auxiliary retaining piles 1 can be increased, the spacing between the auxiliary retaining piles 1 can be reduced to increase the density of the auxiliary retaining piles 1, and the embedding depth of the auxiliary retaining piles 1 can be increased according to actual conditions.

[0032] In the above-mentioned foundation pit support structure, a plurality of auxiliary retaining piles 1 are arranged on the outer side of the auxiliary foundation pit 3, and the steel support 2 is supported between the auxiliary retaining piles 1 and the main secondary lining lintel 6 of the main structure 5. The secondary lining lintel of the main structure 5 is used as the internal fulcrum of the steel support 2, which ensures the force transmission balance of the steel support 2 and solves the problem of erecting the steel support 2. The steel support 2 can effectively control the deformation of the foundation pit and the surface settlement, and protect the safety of the surrounding buildings (structures) 10. Therefore, the above-mentioned foundation pit support structure has the advantages of clear force transmission, convenient construction, short construction period, low cost and less impact on the surrounding environment.

[0033] In a specific implementation, there is a one-to-one correspondence between the auxiliary retaining piles 1 and the steel supports 2, that is, a steel support 2 is provided between the main secondary lining lintel 6 of the main structure 5 and each auxiliary retaining pile 1, thereby forming a structurally stable support structure around the auxiliary foundation pit 3, which is conducive to improving the structural strength and rigidity of the retaining structure. At the same time, in order to further improve the strength and rigidity of the retaining structure, as Figure 1 As shown in the structure, an auxiliary crown beam 7 is arranged on the top of the multiple auxiliary retaining piles 1. The auxiliary crown beam 7 forms an integrated structure with the multiple auxiliary retaining piles 1. The multiple auxiliary retaining piles 1 are fixedly connected as one through the auxiliary crown beam 7 on the top of the auxiliary retaining piles 1, which is beneficial to improving the fixed foundation of the steel support 2.

[0034] While forming a supporting frame through a plurality of auxiliary retaining piles 1 and auxiliary crown beams 7, as shown in FIG. Figure 1As shown in the structure, retaining walls 8 are arranged at the top of the auxiliary crown beam 7 and between the auxiliary retaining piles 1. The retaining wall 8 arranged at the top of the auxiliary crown beam 7 and between the auxiliary retaining piles 1 can further improve the protective performance of the foundation pit support structure, ensure the safety and reliability of the construction environment in the auxiliary foundation pit 3, and prevent accidents such as soil sliding and landslides.

[0035] In order to facilitate the assembly of the steel support 2 with the auxiliary retaining piles 1 and the main body second lining lintel 6, flanges (not shown in the figure) can be provided at both ends of the steel support 2, and mounting seats (not shown in the figure) corresponding to the flanges can be provided on the auxiliary retaining piles 1, and mounting seats (not shown in the figure) corresponding to the flanges can be provided on the auxiliary retaining piles 1. The flanges and the mounting seats are connected one-to-one, and the flanges are fixedly installed on the corresponding mounting seats by bolts passing through the flanges.

[0036] At the same time, in order to further improve the safety of the steel support 2 during the installation process, safety ropes (not shown in the figure) can be respectively provided at the two ends of the steel support 2, and buckles corresponding to the safety ropes can be provided on the mounting seats of the auxiliary guard piles 1 and the second lining beam 6 of the main body. The safety rope can be quickly disassembled through the buckle, and the risk of the steel support 2 falling during the installation process can be further improved by hanging the safety rope, thereby preventing safety accidents caused by the falling of the steel support.

[0037] While reinforcing the auxiliary retaining piles 1 and the steel supports 2, structural reinforcements for enhancing the structural strength and rigidity of the main body secondary lining lintel 6 can also be added. Compared with the prior art, the main body secondary lining lintel 6 not only serves as a supporting frame for the main structure 5, but also provides a fulcrum for the steel supports 2 in the foundation pit support structure of the auxiliary foundation pit 3. Therefore, it is necessary to improve the structural strength and rigidity of the main body secondary lining lintel 6.

[0038] By arranging the structural reinforcement in the main body secondary lining lintel 6, the main body secondary lining lintel 6 can further improve the structural strength and rigidity while satisfying the use strength.

[0039] The structural reinforcement may include a supporting steel plate (not shown in the figure), and the supporting steel plate is buried on the side of the main body second lining lintel 6 facing the steel support 2 to meet the structural strength and stiffness requirements of the main body second lining lintel 6 supporting the steel support 2.

[0040] The structural reinforcement may also include stirrups (not shown in the figure) for resisting shear in the horizontal and vertical directions. By arranging stirrups in the main body second lining lintel 6, the horizontal and vertical shear resistance of the main body second lining lintel 6 can be improved.

[0041] An upward flange 9 is provided at the top of the main secondary lining lintel 6 to facilitate the erection of the steel support 2 of the auxiliary structure. The cross-sectional dimensions and reinforcement of the main secondary lining lintel 6 need to meet the bending and shear bearing capacity requirements, and the vertical side waist reinforcement specifications can also be increased.

[0042] When the above foundation pit support structure is used to construct the auxiliary structure, Figure 2 As shown in the structure, before excavating the auxiliary foundation pit 3, in order to construct the main structure 5, a main retaining pile 4 for support is arranged around the main foundation pit. In order to support the excavated auxiliary foundation pit 3, a plurality of auxiliary retaining piles 1 are pre-buried on the side of the auxiliary foundation pit 3 away from the main retaining pile 4. The plurality of auxiliary retaining piles 1 are arranged at intervals along the length direction of the auxiliary foundation pit 3. An auxiliary crown beam 7 and a retaining wall 8 can be arranged on the top of the auxiliary retaining pile 1. After the auxiliary retaining pile 1 is prepared, as shown in FIG. Figure 1 As shown in the structure, the auxiliary foundation pit 3 is excavated, and during the excavation process, the main retaining piles 4, the crown beams and the retaining walls 8 formed between the main retaining piles 4 are excavated and chiseled. After the main secondary lining lintel 6 is exposed, a steel support 2 is set between the auxiliary retaining piles 1 and the main secondary lining lintel 6, so that one end of the steel support 2 is supported on the auxiliary retaining piles 1 and the other end is supported on the main secondary lining lintel 6; when all the steel supports 2 are constructed, the auxiliary foundation pit 3 is continued to be excavated, and the main retaining piles 4 and the retaining walls 8 therebetween are excavated and chiseled, until the excavation of the auxiliary foundation pit 3 is completed, and the auxiliary structure connected to the main structure 5 is continued to be constructed in the auxiliary foundation pit 3, as shown in FIG. Figure 3 The structure is shown.

[0043] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A foundation pit support structure, characterized in that: Includes multiple attached retaining piles and multiple steel supports; A plurality of said auxiliary retaining piles are arranged on a side of the auxiliary foundation pit away from the main structure and are arranged opposite to the main retaining piles; The steel support is supported between the auxiliary retaining piles and the main secondary lining lintel of the main structure; a plurality of the auxiliary retaining piles are evenly distributed along the length direction of the auxiliary foundation pit; There is a one-to-one correspondence between the auxiliary retaining piles and the steel supports; An auxiliary crown beam is arranged on the top of the plurality of auxiliary guard piles; The subsidiary crown beam and the plurality of subsidiary retaining piles form an integrated structure; A retaining wall is provided on the top of the subsidiary crown beam and between the subsidiary retaining piles; Both ends of the steel support are provided with flanges; Mounting seats are provided on the auxiliary guard piles and the main body secondary lining lintel, and the mounting seats are used to dock with the flange plate; The flange is fixed to the mounting seat by bolts; A structural reinforcement is added to the main body second lining lintel to enhance its structural strength and rigidity; the structural reinforcement includes a supporting steel plate, which is buried on the side of the main body second lining lintel facing the steel support; the structural reinforcement also includes stirrups for resisting shear in the horizontal and vertical directions.

2. The foundation pit support structure according to claim 1, characterized in that: A safety rope is provided at the end of the steel support; A buckle for quickly connecting the safety rope is arranged on the mounting seat.

3. The foundation pit supporting structure according to claim 2, characterized in that: An upward flange is arranged on the top of the second lining lintel of the main body.

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