CN215669539U - PHC precast tubular pile and steel lattice column combined diagonal brace - Google Patents

PHC precast tubular pile and steel lattice column combined diagonal brace Download PDF

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Publication number
CN215669539U
CN215669539U CN202121137780.6U CN202121137780U CN215669539U CN 215669539 U CN215669539 U CN 215669539U CN 202121137780 U CN202121137780 U CN 202121137780U CN 215669539 U CN215669539 U CN 215669539U
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China
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steel lattice
tubular pile
phc
precast tubular
end plate
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CN202121137780.6U
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Inventor
蔡忠祥
岳建勇
张凯
侯胜男
童园梦
周延
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East China Architectural Design and Research Institute Co Ltd
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East China Architectural Design and Research Institute Co Ltd
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Abstract

The utility model belongs to a PHC precast tubular pile and steel lattice column combined diagonal brace in the field of foundation pit support. The technical scheme is that a PHC precast tubular pile and steel lattice column combined diagonal brace is adopted, fender piles are arranged around a foundation pit, and a capping beam is arranged at the tops of the fender piles; the inclined strut is formed by combining a PHC prefabricated pipe pile and a steel lattice, the PHC prefabricated pipe pile is positioned below the pit bottom, the PHC prefabricated pipe pile is inserted into the steel lattice to be connected and fixed, and the upper end of the steel lattice is connected with the cast-in-place reinforced concrete capping beam. Compared with the traditional inclined supporting system of the central island, the bottom plate is implemented twice; the mode can reduce the arrangement of extra post-cast strips of the foundation slab, improve the excavation efficiency and reduce the adverse effect of the construction load at the edge of the pit on the supporting structure.

Description

PHC precast tubular pile and steel lattice column combined diagonal brace
Technical Field
The utility model relates to the field of building foundation pit support, in particular to a PHC precast tubular pile and steel lattice column combined diagonal brace.
Background
With the pace of urbanization progress in China being accelerated, the development and utilization of underground space are rapidly developed. In order to ensure the construction of the underground structure and the safety of the surrounding environment, protective measures such as supporting and reinforcing are required to be adopted on the side wall and the periphery of the foundation pit. The support of the foundation pit engineering is divided into a horizontal support and an inclined cast support according to the setting direction, and the inclined cast support generally adopts a steel pipe or steel support form.
The slope protection needs to be left in the traditional inclined throwing support construction process, and the inclined throwing support is erected after the construction bottom plate is poured and reaches the design strength in advance. When the inclined throwing strut is installed, one end of the inclined throwing strut abuts against the foundation bottom plate through the bracket, the other end of the inclined throwing strut abuts against the enclosing purlin of the enclosure system, and after the inclined throwing strut is arranged, soil is excavated, a soil retaining area bottom plate is constructed, and the strut is replaced. After the bottom plate and the support replacement reach the design strength, the inclined throwing support is dismantled, and the upper structure is continuously constructed; or after the construction of the basement structure is finished and the design strength is reached, the inclined throwing support is dismantled.
In the traditional inclined cast strut construction process, the bottom plate needs to be poured in a subarea mode, a post-pouring belt needs to be additionally arranged on the foundation bottom plate, and the risk of water seepage of the bottom plate is increased; the hole limit is stayed native bank protection and can only hole limit is drawn and is dug, and it is inefficient to dig, and hole limit construction load can lead to supporting construction and lateral wall soil layer can produce great deformation to seriously influence foundation ditch engineering's safety.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a PHC precast tubular pile and steel lattice column combined diagonal brace, which aims to reduce the arrangement of extra post-cast strips of a foundation slab, improve the excavation efficiency and reduce the adverse effect of pit edge construction load on a supporting structure.
The technical scheme of the utility model is as follows: a PHC precast tubular pile and steel lattice column combined diagonal brace is characterized in that guard piles are arranged around a foundation pit, and a capping beam is arranged at the top of each guard pile; the inclined strut is formed by combining a PHC prefabricated pipe pile and a steel lattice, the PHC prefabricated pipe pile is positioned below the pit bottom, the PHC prefabricated pipe pile is inserted into the steel lattice to be connected and fixed, and the upper end of the steel lattice is connected with the cast-in-place reinforced concrete capping beam. Typically the steel lattice can be constructed by angle steel and plate-over welding.
Based on the technical characteristics: the butt joint surface of the PHC precast tubular pile and the steel lattice is provided with a tubular pile end plate; a steel lattice end plate is arranged inside the steel lattice; the tubular pile end plate is connected with the steel lattice end plate through welding or bolts.
Based on the technical characteristics: grouting holes are arranged on the steel lattice end plate and the tubular pile end plate.
Based on the technical characteristics: the inside of the connection part of the PHC precast tubular pile and the steel lattice is poured with fine aggregate concrete, and a construction steel bar is arranged at the core pouring section.
Based on the technical characteristics: the steel lattice end plate is provided with a stiffening rib.
The utility model has the beneficial effects that: the PHC precast tubular pile and steel lattice column combined foundation pit supporting structure has high strength and stability. Compared with steel pipes, the PHC precast tubular pile, namely the prestressed high-strength concrete precast tubular pile, is low in production energy consumption, is used for being inserted below the pit bottom to serve as a non-recovery part, and reduces construction cost. The process has a promoting effect on industry progress, energy conservation and emission reduction, and has a very good market prospect; the arrangement of extra post-cast strips of the bottom plate can be reduced in the construction process, the excavation efficiency is improved, and the adverse effect of the construction load at the edge of the pit on the supporting structure is reduced.
Drawings
Fig. 1 is a schematic diagram of a PHC precast tubular pile and steel lattice column combined type foundation pit supporting structure.
Fig. 2 is a schematic cross-sectional view of the connection of the steel lattice and the PHC precast tubular pile.
Fig. 3 is a schematic longitudinal section view of the connection of the steel lattice and the PHC precast tubular pile.
Fig. 4 is a schematic plan view of a connection structure of a steel lattice and a PHC precast tubular pile.
Fig. 5 is a perspective view of a steel lattice end plate and stiffening ribs.
FIG. 6 is a plan view of the stiffener construction.
FIG. 7 is a perspective view of a stiffener structure.
Figure 8 is a schematic of a steel lattice end plate construction.
Fig. 9 is a perspective view of a steel lattice end plate construction.
The reference signs are: PHC prefabricating a tubular pile 1; a steel lattice 2; a capping beam 3; a fender post 4; a first stiffener 5; a second stiffener 6; a third stiffener 7; a first end plate 8; a second end plate 9; fine stone concrete 10; constructing a steel bar 11; a foundation slab 12.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Referring to fig. 1, the diagonal bracing structure is formed by combining a PHC precast tubular pile 1 and a steel lattice 2, and is formed by firstly adopting a high-pressure jet grouting pile to obliquely lead a hole to the elevation position of the bottom of the diagonal bracing and then inserting the diagonal bracing structure. The PHC precast tubular pile 1 and the end plate of the steel lattice 2 connected with the PHC precast tubular pile 1 are positioned below the bottom of the pit, the steel lattice 2 is welded on the PHC precast tubular pile 1 through the end plate, and the other end of the steel lattice 2 is connected with the capping beam 3. The capping beam 3 is located on top of the fender pile 4. In fig. 1, a broken line part is a basement of a building to be built, and a foundation slab 12 is arranged at the lower part.
The steel lattice 2 is arranged above the pit bottom, the strength is high, and the hoisting, the recovery and the cutting are convenient. Below the pit bottom are PHC precast tubular pile 1, steel lattice end plate, tubular pile end plate and stiffening rib. The PHC precast tubular pile 1 is used as a bearing part of the inclined strut member, has high strength and low cost, and generates large side resistance and end resistance.
Before inserting the PHC precast tubular pile 1, the inclined throwing support position and angle are determined, and the PHC precast tubular pile is inserted by adopting a static pressure, hammering or hole leading mode according to conditions. When the PHC precast tubular pile 1 is inserted in a hole guiding mode, a high-pressure jet grouting pile is obliquely constructed at the ground position to reach the bottom elevation position of the PHC precast tubular pile 1, and the diameter of the high-pressure jet grouting pile is larger than that of the PHC precast tubular pile 1.
Referring to fig. 2, the PHC precast tubular pile 1 is inserted into the steel lattice 2, and the diameter of the PHC precast tubular pile 1 is smaller than the inside clear dimension of the steel lattice 2.
Referring to fig. 3, the PHC precast tubular pile 1 is inserted into the steel lattice 2 connection structure, a tubular pile end plate is arranged on the butt joint surface of the top of the PHC precast tubular pile 1, a steel lattice end plate is arranged on the butt joint surface of the steel lattice 2, and the tubular pile end plate and the steel lattice end plate are both provided with grouting ports. The tubular pile end plate and the steel lattice end plate are mutually butted and fixed. As shown in fig. 4, 5, 8 and 9, the steel lattice end plate is formed by welding or bolting a first end plate 8 and a second end plate 9, and a filling hole is formed in the middle. To ensure the effective connection of the first and second end plates 8, 9 to the steel lattice 2, as shown in fig. 6 and 7, first, second and third stiffening ribs 5, 6 and 7 are provided on the back of the first and second end plates 8, 9 in the steel lattice 2. The first stiffening rib 5, the second stiffening rib 6 and the third stiffening rib 7 are combined to form a stiffening rib with four corners high and middle low, and the projection of the plane is a # -shaped stiffening rib. The shape of the first, second and third stiffening ribs 5, 6 and 7 shown in fig. 5, 6 and 7 is merely illustrative, and the first and second stiffening ribs 5 and 6 have a higher side than the third stiffening rib 7 in order to satisfy the increase in the length of the weld between the side of the first and second stiffening ribs 5 and 6 and the inner wall of the steel lattice 2.
As shown in fig. 3, the PHC precast tubular pile 1 is poured with 2m long fine stone concrete 10, and the core pouring section is provided with construction steel bars 11.
The scheme has the advantages that the PHC precast tubular pile 1 is adopted in the structure below the pit bottom without recovery, and has great economic advantages compared with other steel materials; the cross-section bending modulus that PHC precast tubular pile 1 provided is higher than H steel and round steel pipe, and the stability of buckling is better.
The scheme is innovated on the basis of the prior supporting technology, reduces the construction cost and the material waste, and makes the related technology step forward to the advanced, safe and economic direction.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (5)

1. A PHC precast tubular pile and steel lattice column combined diagonal brace is characterized in that a guard pile (4) is arranged around a foundation pit, and a capping beam (3) is arranged at the top of the guard pile (4); the method is characterized in that: the bracing is formed by PHC precast tubular pile (1) and steel lattice (2) combination, PHC precast tubular pile (1) are located below the hole bottom, PHC precast tubular pile (1) insert steel lattice (2) internal connection is fixed, the upper end of steel lattice (2) is connected capping beam (3).
2. The PHC precast tubular pile and steel lattice column combined diagonal brace according to claim 1, is characterized in that: the butt joint surface of the PHC precast tubular pile (1) and the steel lattice (2) is provided with a tubular pile end plate; a steel lattice end plate is arranged in the steel lattice (2); the tubular pile end plate is connected with the steel lattice end plate through welding or bolts.
3. The PHC precast tubular pile and steel lattice column combined diagonal brace is characterized in that: the steel lattice end plate and the tubular pile end plate are provided with grouting holes.
4. The PHC precast tubular pile and steel lattice column combined diagonal brace according to claim 3, is characterized in that: the PHC precast tubular pile and the inside poured fine aggregate concrete (10) of steel lattice (2) junction to set up construction steel bar (11) at the section of pouring into the core.
5. The PHC precast tubular pile and steel lattice column combined diagonal brace is characterized in that: the steel lattice end plate is provided with a stiffening rib.
CN202121137780.6U 2021-05-26 2021-05-26 PHC precast tubular pile and steel lattice column combined diagonal brace Active CN215669539U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121137780.6U CN215669539U (en) 2021-05-26 2021-05-26 PHC precast tubular pile and steel lattice column combined diagonal brace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121137780.6U CN215669539U (en) 2021-05-26 2021-05-26 PHC precast tubular pile and steel lattice column combined diagonal brace

Publications (1)

Publication Number Publication Date
CN215669539U true CN215669539U (en) 2022-01-28

Family

ID=79972838

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202121137780.6U Active CN215669539U (en) 2021-05-26 2021-05-26 PHC precast tubular pile and steel lattice column combined diagonal brace

Country Status (1)

Country Link
CN (1) CN215669539U (en)

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