Temporary concrete pile and support connecting structure and construction method

Abstract

The application discloses a connecting structure and a construction method of a temporary concrete pile and a support, and relates to the field of construction, in particular to a connecting structure and a construction method of a temporary concrete pile and a support. The connecting structure comprises a temporary concrete pile, a pre-embedded steel plate serving as a connecting base is arranged in the temporary concrete pile, the pre-embedded steel plate is connected with a concrete support through a concrete support connecting assembly, and the pre-embedded steel plate is connected with a steel support steel beam through a steel support connecting assembly. The construction method comprises the following steps: constructing an enclosure structure, a dewatering well and a temporary concrete pile; excavating a foundation pit to below the concrete support, arranging the concrete support and connecting the concrete support with the temporary concrete pile; continuing to excavate the foundation pit to below the steel support steel beam, arranging the steel support steel beam and connecting the steel support steel beam with the temporary concrete pile; excavating the foundation pit to a bottom of the foundation pit, and then constructing a main body structure; and cutting off the concrete support, the steel support steel beam and the temporary concrete pile. The application realizes the problem of reducing the span of the support, saves funds compared with the construction of a steel pipe column, and is safer and more feasible than the construction of a lattice column.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of underground structures, and particularly relates to a connecting structure of a temporary concrete pile and a support and a construction method. BACKGROUND

[0002] With the vigorous development of urban construction, underground rail transit networks are becoming more and more developed. The construction of subways is usually carried out under urban roads. The construction of subway foundation pits inevitably conflicts with roads. In order to ensure the smoothness of the ground road and minimize the impact on traffic operation, the cover-excavation top-down method is generally used for construction.

[0003] For the cover-excavation top-down method of foundation pit construction, the following three traditional structure schemes are used: enclosure structure + steel support + concrete support + lattice column, or enclosure structure + steel support + concrete support + steel pipe column, or enclosure structure + steel support + concrete support + temporary concrete pile. The above three traditional structure schemes have the following disadvantages: first, the strength of the lattice column is not enough to support the upper cover plate. Second, the steel pipe column is relatively high in cost and is not economical. Third, the temporary concrete pile cannot be connected with the steel support and the concrete support. When the foundation pit is wide, the stability of the steel support and the concrete support cannot be satisfied. Therefore, the traditional foundation pit construction method has many disadvantages and limitations.

[0004] It is difficult to solve the disadvantages and limitations of the above traditional design and construction schemes. The significance of solving the above problems lies in the need to propose a structure system and construction method that is moderate in cost and high in safety during foundation pit construction excavation. SUMMARY

[0005] The purpose of the present application is to provide a connecting structure of a temporary concrete pile and a support and a construction method. In view of the problem that the temporary concrete pile cannot be connected with the steel support and the concrete support, and when the foundation pit is wide, the stability of the steel support and the concrete support cannot be satisfied, the present application proposes a design concept of "using cover-excavation top plate + temporary pile connection support system during foundation pit construction phase". Through this connecting structure and construction method, the problem of reducing the span of the support is solved, which saves funds compared with the construction of steel pipe columns and is safer and more feasible than the construction of lattice columns, ensuring the safety of foundation pit excavation.

[0006] The technical scheme of the present application is: a connecting structure of a temporary concrete pile and a support, comprising a temporary concrete pile, a pre-embedded steel plate serving as a connecting base is arranged in the temporary concrete pile, the pre-embedded steel plate is connected with a concrete support through a concrete support connecting assembly, and the pre-embedded steel plate is connected with a steel support and a steel beam through a steel support connecting assembly.

[0007] Furthermore, the pre-embedded steel plate is a cylindrical steel plate adapted to the temporary concrete pile, and the pre-embedded steel plate and the temporary concrete pile are coaxial.

[0008] Further, the temporary concrete pile is provided with vertical ring-arranged temporary concrete pile main reinforcement, which is sleeved with temporary concrete pile stirrup reinforcement, and the temporary concrete pile main reinforcement is sleeved with temporary concrete pile reinforcing reinforcement.

[0009] Further, the temporary concrete pile stirrup reinforcement and the temporary concrete pile reinforcing reinforcement are connected with anchor reinforcement, and the anchor reinforcement is connected with the embedded steel plate.

[0010] Further, the concrete support connecting assembly comprises a concrete support node upper ring plate welded with the embedded steel plate, a concrete support node patch plate, and a concrete support node lower ring plate, and the concrete support node patch plate vertically connects the concrete support node upper ring plate and the concrete support node lower ring plate.

[0011] Further, the concrete support node upper ring plate and the concrete support node lower ring plate are connected with the concrete support reinforcement in the concrete support.

[0012] Further, the steel support connecting assembly comprises a steel support steel beam node ring plate welded with the embedded steel plate and a steel support steel beam patch plate, and the upper end of the steel support steel beam node ring plate is connected with the steel support steel beam.

[0013] Further, the steel support steel beam patch plate vertically supports the steel support steel beam node ring plate.

[0014] A construction method of a temporary concrete pile and support connecting structure, comprising the following steps:

[0015] A. Construction of a surrounding structure and a dewatering well, construction of a temporary concrete pile according to a designed position;

[0016] B. Excavation of a foundation pit to a certain distance below the concrete support, setting of the concrete support, and connection of the set concrete support with the temporary concrete pile;

[0017] C. Continued excavation of the foundation pit to a certain distance below the steel support steel beam, setting of the steel support steel beam, and connection of the set steel support steel beam with the temporary concrete pile;

[0018] D. Excavation of the foundation pit to the bottom of the foundation pit, and then construction of a main structure;

[0019] E. Cutting of the concrete support, the steel support steel beam, and the temporary concrete pile.

[0020] Further, in step A, the temporary concrete pile is constructed according to the designed position, and the temporary concrete pile functions as an anti-pulling pile, and an embedded steel plate and anchor reinforcement are reserved during the construction of the temporary concrete pile.

[0021] The beneficial effects of the present application are as follows:

[0022] The temporary concrete pile replaces the lattice column scheme, compared with the enclosure + steel support + concrete support + lattice column scheme, solves the problem of insufficient strength of the lattice column, and ensures the safety of the foundation pit.

[0023] The temporary concrete pile replaces the steel pipe column scheme, compared with the enclosure + steel support + concrete support + steel pipe column scheme, solves the problem of large investment, and is more economical.

[0024] The connection structure of the temporary concrete pile and the support, compared with the conventional enclosure + steel support + concrete support + temporary concrete pile scheme, solves the problem that the temporary concrete pile cannot be connected with the steel support and the concrete support, and when the foundation pit is wide, the stability of the steel support and the concrete support cannot meet the requirements. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the structure plan of the temporary concrete pile in the present application;

[0026] Figure 2 is the connection section view of the temporary concrete pile of the present application;

[0027] Figure 3 is the reinforcement connection structure plan of the concrete support of the present application;

[0028] Figure 4 is the connection structure section view of the steel support steel beam of the present application;

[0029] Figure 5 is the connection structure plan of the steel support steel beam of the present application;

[0030] Figure 6 is step one in the construction sequence of the present application;

[0031] Figure 7 is step two in the construction sequence of the present application;

[0032] Figure 8 is step three in the construction sequence of the present application;

[0033] Among them:

[0034] 1 temporary concrete pile 2 embedded steel plate

[0035] 3 anchor bar 4 upper ring plate of concrete support node

[0036] 5 concrete support node plate 6 lower ring plate of concrete support node

[0037] 7 concrete support 8 steel support steel beam

[0038] 9 steel support steel beam node ring plate 10 steel support steel beam node plate

[0039] 11 concrete support steel 12 temporary concrete pile main reinforcement

[0040] 13 temporary concrete pile hoop 14 temporary concrete pile reinforcement

[0041] 15 filling welding. DETAILED DESCRIPTION

[0042] Hereinafter, the present application will be described in detail with reference to the accompanying drawings and examples:

[0043] As shown in the drawings, Figures 1 to 8 A temporary concrete pile and support connecting structure, comprising a temporary concrete pile 1, a pre-embedded steel plate 2 as a connecting base is arranged in the temporary concrete pile 1, the pre-embedded steel plate 2 is connected with a concrete support 7 through a concrete support connecting assembly, and the pre-embedded steel plate 2 is connected with a steel support steel beam 8 through a steel support connecting assembly.

[0044] The pre-embedded steel plate 2 is a cylindrical steel plate adapted to the temporary concrete pile 1, and the pre-embedded steel plate 2 and the temporary concrete pile 1 are coaxial.

[0045] The temporary concrete pile 1 is provided with temporary concrete pile main reinforcement 12 arranged vertically in a ring, the temporary concrete pile main reinforcement 12 is sleeved with temporary concrete pile hoop 13, and the temporary concrete pile main reinforcement 12 is sleeved with temporary concrete pile reinforcement 14.

[0046] The temporary concrete pile hoop 13 and the temporary concrete pile reinforcement 14 are connected with anchor bars 13, and the anchor bars 13 are connected with the pre-embedded steel plate 2.

[0047] The concrete support connecting assembly comprises a concrete support node upper ring plate 4 welded with the pre-embedded steel plate 2, a concrete support node plate 5, and a concrete support node lower ring plate 6, and the concrete support node plate 5 vertically connects the concrete support node upper ring plate 4 and the concrete support node lower ring plate 6.

[0048] The concrete support node upper ring plate 4 and the concrete support node lower ring plate 6 are connected with the concrete support steel 11 in the concrete support 7.

[0049] The steel support connecting assembly comprises a steel support steel beam node ring plate 9 welded with the pre-embedded steel plate 2 and a steel support steel beam node plate 10, and the upper end of the steel support steel beam node ring plate 9 is connected with the steel support steel beam 8.

[0050] The steel support steel beam node ring plate 9 is welded and fixed with the embedded steel plate 2 in the temporary concrete pile.

[0051] Specifically, the anchor bar 3 includes transverse anchor bars and longitudinal anchor bars, which are arranged in a cross shape.

[0052] The anchor bar 3 is fixed with the embedded steel plate 2 in the temporary concrete pile 1 by means of fillet welding 15.

[0053] Specifically, the temporary concrete pile hoop 13 is a ring-shaped hoop, the transverse anchor bars are placed above the temporary concrete pile hoop 13 and the temporary concrete pile reinforcing bar 14 and are fixed by being tied together, and the longitudinal anchor bars 3 are placed below the temporary concrete pile hoop 13 and the temporary concrete pile reinforcing bar 14 and are fixed by being tied together.

[0054] Specifically, the concrete support node upper ring plate 4 and the concrete support node lower ring plate 6 are both ring-shaped plates, and both are welded and fixed with the embedded steel plate 2 in the temporary concrete pile 1, the concrete support node upper ring plate 4 and the concrete support node lower ring plate 6 are parallel, and a welded concrete support node patch plate 5 is arranged therebetween, and the concrete support node patch plate 5 is welded with the outer wall of the embedded steel plate 2.

[0055] Specifically, the concrete support steel bar 11 includes upper steel bars and lower steel bars, one end of the upper steel bar is placed to the upper end of the concrete support node upper ring plate 4 and is fixed by welding, and the lower steel bar is placed to the lower end of the concrete support node lower ring plate and is fixed by welding.

[0056] Specifically, the concrete support 7 is cast in place by using the concrete support steel bar 11.

[0057] Specifically, the steel support steel beam node ring plate 9 is also ring-shaped, and the steel support steel beam node ring plate 9 is welded and fixed with the embedded steel plate 2 in the temporary concrete pile 1. The outer wall of the embedded steel plate 2 is also welded with a steel support steel beam patch plate 10, the steel support steel beam patch plate 10 supports the steel support steel beam node ring plate 9, and the steel support steel beam node ring plate 9 and the steel support steel beam patch plate 10 are fixed by welding.

[0058] Specifically, the lower end of the steel support steel beam 8 is fixed with the steel support steel beam node ring plate 9 by welding.

[0059] Specifically, the steel support steel beams 8 are arranged in parallel outside the temporary concrete pile 1.

[0060] A construction method of a connection structure of a temporary concrete pile and a support, comprising the following steps:

[0061] A. Construction of the construction enclosure, dewatering well, and temporary concrete pile 1 according to the design position;

[0062] B. Excavate the foundation pit to a certain distance below the concrete support 7, set the concrete support 7, and connect the set concrete support 7 with the temporary concrete pile 1;

[0063] C. Continue to excavate the foundation pit to a certain distance below the steel support steel beam 8, set the steel support steel beam 8, and connect the set steel support steel beam 8 with the temporary concrete pile 1;

[0064] D. Excavate the foundation pit to the bottom of the foundation pit, and then construct the main structure;

[0065] E. Cut off the concrete support 7, steel support steel beam 8, and temporary concrete pile 1.

[0066] Step A: Construction of the construction enclosure, dewatering well, and temporary concrete pile 1 according to the design position, wherein the temporary concrete pile 1 also serves as an anti-pulling pile, and a pre-embedded steel plate 2 and anchor reinforcement 3 are reserved during the construction of the temporary concrete pile 1.

[0067] Specifically, in step B, the foundation pit is excavated to a certain distance below the concrete support 7, and the certain distance below is 0.5 m.

[0068] Specifically, before setting the concrete support 7 in step B, the temporary concrete pile 1 needs to be treated, and the specific process is as follows:

[0069] First, the floating slurry at the corresponding position of the temporary concrete pile 1 is chiseled and cleaned until the pre-embedded steel plate 2 is exposed;

[0070] Then, the concrete support node upper ring plate 4, concrete support node patch plate 5, and concrete support node lower ring plate 6 are welded at the exposed pre-embedded steel plate 2.

[0071] Specifically, in step B, the concrete support 7 is set, and the specific process is as follows:

[0072] First, the upper end of the concrete support steel reinforcement 11 is placed at the upper end of the concrete support node upper ring plate 4, and is fixed by welding;

[0073] Then, the lower end of the concrete support steel reinforcement 11 is placed at the lower end of the concrete support node lower ring plate, and is fixed by welding;

[0074] Finally, the concrete support 7 is poured through the concrete support steel reinforcement 11.

[0075] Specifically, in step C, the foundation pit is continued to be excavated to a certain distance below the steel support steel beam 8, and the certain distance below is 0.5 m.

[0076] Specifically, before the steel support steel beam 8 is arranged in step C, the temporary concrete pile 1 needs to be processed, and the specific process is as follows:

[0077] First, the floating slurry at the corresponding position of the temporary concrete pile 1 is chiseled and cleaned until the reserved steel plate 2 is exposed.

[0078] Then, the steel support steel beam node ring plate 9 and the steel support steel beam joint plate 10 are welded at the outer wall of the reserved steel plate 2.

[0079] Specifically, the steel support steel beam 8 is arranged in step C, and the specific process is as follows:

[0080] The steel support steel beam 8 is welded with the welded steel support steel beam node ring plate 9.

[0081] Specifically, the temporary concrete pile concrete 1 adopts C50 concrete, the thickness of the reserved steel plate 2 adopts 20mm, the anchor bar 3 adopts HRB400E grade steel bar with a diameter of 28mm, the thickness of the upper ring plate 4 of the concrete support node adopts 40mm, the thickness of the joint plate 5 of the concrete support node adopts 35mm, the thickness of the lower ring plate of the concrete support node adopts 40mm, the thickness of the steel support steel beam node ring plate 9 adopts 40mm, and the thickness of the steel support steel beam node joint plate 10 adopts 35mm.

[0082] The temporary concrete pile replaces the lattice column scheme, compared with the enclosure structure + steel support + concrete support + lattice column scheme, the problem of insufficient strength of the lattice column is solved, and the safety of the foundation pit is ensured.

[0083] The temporary concrete pile replaces the steel pipe column scheme, compared with the enclosure structure + steel support + concrete support + steel pipe column scheme, the problem of large investment is solved, and the economy is better.

[0084] The connection structure of the temporary concrete pile and the support is adopted, compared with the conventional enclosure structure + steel support + concrete support + temporary concrete pile scheme, the problem that the temporary concrete pile cannot be connected with the steel support and the concrete support is solved, and when the foundation pit is wide, the stability of the steel support and the concrete support cannot meet the requirements.

Claims

1. A connection structure of a temporary concrete pile and a support, comprising a temporary concrete pile (1), characterized in that: The temporary concrete pile (1) is provided with a pre-embedded steel plate (2) as a connecting base, the pre-embedded steel plate (2) is connected with a concrete support (7) through a concrete support connecting assembly, and the pre-embedded steel plate (2) is connected with a steel support steel beam (8) through a steel support connecting assembly; The concrete support connecting assembly comprises a concrete support node upper ring plate (4) welded with the pre-embedded steel plate (2), a concrete support node patch plate (5), and a concrete support node lower ring plate (6); the concrete support node patch plate (5) vertically connects the concrete support node upper ring plate (4) and the concrete support node lower ring plate (6); The steel support connecting assembly comprises a steel support steel beam node ring plate (9) welded with the pre-embedded steel plate (2) and a steel support steel beam patch plate (10); the upper end of the steel support steel beam node ring plate (9) is connected with the steel support steel beam (8); The concrete support steel bar (11) comprises upper steel bars and lower steel bars; one end of the upper steel bars is placed at the upper end of the concrete support node upper ring plate (4) and is fixed by welding; the lower steel bars are placed at the lower end of the concrete support node lower ring plate and are fixed by welding; the concrete support (7) is cast in situ by using the concrete support steel bar (11); The temporary concrete pile (1) is provided with a temporary concrete pile main reinforcement (12) arranged in a vertical ring; the temporary concrete pile main reinforcement (12) is sleeved with a temporary concrete pile stirrup (13), and the temporary concrete pile main reinforcement (12) is sleeved with a temporary concrete pile reinforcing bar (14); The temporary concrete pile stirrup (13) and the temporary concrete pile reinforcing bar (14) are connected with anchor bars (3), and the anchor bars (3) are connected with the pre-embedded steel plate (2); The anchor bars (3) comprise horizontal anchor bars and longitudinal anchor bars, and the horizontal anchor bars and the longitudinal anchor bars are arranged in a cross shape; The anchor bars (3) are fixed with the pre-embedded steel plate (2) in the temporary concrete pile (1) by means of fillet welding (15); The pre-embedded steel plate (2) is a cylindrical steel plate adapted to the temporary concrete pile (1), and the pre-embedded steel plate (2) and the temporary concrete pile (1) are coaxial; The concrete support node upper ring plate (4) and the concrete support node lower ring plate (6) are connected with the concrete support steel bar (11) in the concrete support (7); The steel support steel beam patch plate (10) vertically supports the steel support steel beam node ring plate (9).

2. The construction method of a temporary concrete pile and support connection structure according to claim 1, characterized in that: The method comprises the following steps: A. construction of a temporary concrete pile (1) according to the design position; B. excavating the foundation pit to a certain distance below the concrete support (7), setting the concrete support (7), and connecting the set concrete support (7) with the temporary concrete pile (1); C. continuing to excavate the foundation pit to a certain distance below the steel support steel beam (8), setting the steel support steel beam (8), and connecting the set steel support steel beam (8) with the temporary concrete pile (1); D. excavating the foundation pit to the bottom of the foundation pit, and then constructing the main structure; Weld the steel bracing steel beam (8) with the welded steel bracing steel beam joint ring plate (9); E. Cut off the concrete support (7), steel bracing steel beam (8), temporary concrete pile (1); Step B needs to process the temporary concrete pile (1) before setting the concrete support (7), the specific process is as follows: First, the floating slurry at the corresponding position of the temporary concrete pile (1) is chiseled and cleaned until the embedded steel plate (2) is exposed; Then, weld the concrete support node upper ring plate (4), the concrete support node patch plate (5), and the concrete support node lower ring plate (6) at the exposed embedded steel plate (2); Specifically, step B sets the concrete support (7), and the specific process is as follows: First, place the upper end of the concrete support steel bar (11) on the upper end of the concrete support node upper ring plate (4) and fix it by welding; Then, place the lower end of the concrete support steel bar (11) on the lower end of the concrete support node lower ring plate and fix it by welding; Finally, pour the concrete support (7) through the concrete support steel bar (11).

3. A method of constructing a connection between a temporary concrete pile and a support according to claim 2, characterized in that: Step A constructs the enclosure structure and the dewatering well, and constructs the temporary concrete pile (1) according to the design position, the temporary concrete pile (1) also serves as an anti-pulling pile, and the embedded steel plate (2) and the anchor bar (3) are reserved during the construction of the temporary concrete pile (1).

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