Enclosure stand column pile structure in dense urban agglomeration and construction method of enclosure stand column pile structure

Abstract

The invention discloses an enclosure stand column pile structure in a dense urban agglomeration and a construction method thereof.The enclosure stand column pile structure comprises a root planting pile, a prefabricated PHC pipe pile and a latticed column, the lower end of the latticed column is embedded in the prefabricated PHC pipe pile, the lower end of the prefabricated PHC pipe pile is connected to the upper end of the root planting pile through a pin, and the lower end of the latticed column is connected to the lower end of the root planting pile through a pin; and concrete is poured into the prefabricated PHC pipe pile to form a post-pouring column core. The construction method solves the problem of large mud amount or unstable stress system in the existing construction of the upright pile of the dense urban agglomeration.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a protective column pile structure in a dense urban agglomeration and a construction method thereof. Background Art

[0002] As the process of industrialization gradually accelerates, buildings in cities are slowly developing downward and upward, and the density of buildings is also increasing. This places more stringent requirements on the foundation pit retaining form and pile foundation form of buildings in dense urban agglomerations.

[0003] At present, the supporting piles for retaining walls in densely populated urban agglomerations are in the form of cast-in-place piles plus lattice columns, and a few areas also use pipe piles plus lattice columns.

[0004] The cast-in-place piles plus lattice columns are welded to the steel cage and the lattice columns and then cast as a whole.

[0005] The pipe pile plus lattice column is constructed by casting the lattice column and the insert together, and then inserting the whole into the internal hole of the pipe pile.

[0006] Among the existing construction technologies, cast-in-place piles plus lattice columns are the most common. They have high stability but require a large amount of mud, which is difficult to transport. If drying treatment is used, a large working surface is required, which is not conducive to civilized construction on site. The overall cost of pipe piles plus lattice columns is relatively cheap, but the construction process is difficult to adapt to the working conditions of dense urban agglomerations, and the lattice columns and the cores are easily separated from the pipe piles under vertical loads, causing the lattice columns to move downward, which is not conducive to the safety of the foundation pit. Summary of the invention

[0007] In order to overcome the defects of the existing technology, a retaining column pile structure in a dense urban agglomeration and a construction method thereof are provided to solve the problems of large amount of mud or unstable force system in the existing column pile construction of dense urban agglomerations.

[0008] To achieve the above-mentioned purpose, a retaining column pile structure in a dense urban agglomeration is provided, comprising rooted piles, prefabricated PHC pipe piles and lattice columns, wherein the lower end of the lattice column is buried in the prefabricated PHC pipe piles, the lower end of the prefabricated PHC pipe piles is connected to the upper end of the rooted piles by pins, and concrete is poured into the prefabricated PHC pipe piles to form a post-cast column core.

[0009] Furthermore, the length of the prefabricated PHC pile is 3m.

[0010] Furthermore, the prefabricated PHC pipe pile includes a steel wire cage and precast concrete sleeved on the outside of the lower end of the lattice column, and the precast concrete covers the lower end of the lattice column and the steel wire cage.

[0011] Furthermore, the prefabricated PHC pile also includes two end plates, and the two end plates are connected to the opposite ends of the steel strand cage.

[0012] Furthermore, the end plate at the lower end of the prefabricated PHC pipe pile is connected to the end plate at the upper end of the root pile through a pin.

[0013] The present invention provides a construction method for a retaining column pile structure in a dense urban agglomeration, comprising the following steps:

[0014] Pour concrete into the prefabricated PHC piles to form post-cast column cores;

[0015] Connecting the upper end of the root pile to the lower end of the prefabricated PHC pipe pile through a pin to form a retaining column pile structure in a dense urban cluster;

[0016] Lift the retaining column pile structure in dense urban agglomerations and carry out pile planting construction.

[0017] The beneficial effect of the present invention is that the pile structure of the enclosure column in the dense urban agglomeration of the present invention greatly reduces the amount of mud discharged during the construction process through the lower concrete force system for the root pile, and the overall component can be processed on site, shortening the construction period and saving the cost. The lattice column and the root pile form a whole, and then the core is poured, and the overall force system is stable, which solves the shortcomings of the conventional method from two aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 It is a schematic structural diagram of the retaining column pile structure in a dense urban cluster according to an embodiment of the present invention.

[0020] Figure 2 It is a schematic structural diagram of a prefabricated PHC pile according to an embodiment of the present invention.

[0021] Figure 3 It is a schematic structural diagram of an end plate of a prefabricated PHC pile according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the state of the prefabricated PHC pile after core filling according to an embodiment of the present invention.

[0023] Figure 5 Schematic diagram of the structure of the end plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] Reference Figures 1 to 5 As shown, the present invention provides a retaining column pile structure in a dense urban agglomeration, including root piles 1, prefabricated PHC pipe piles 2 and lattice columns 3.

[0027] The root pile 1, the prefabricated PHC pipe pile 2 and the lattice column 3 are coaxially arranged.

[0028] The prefabricated PHC pile 2 is integrally formed with the lattice column 3. The lower end of the lattice column 3 is buried in the prefabricated PHC pile 2. The lower end of the prefabricated PHC pile 2 is connected to the upper end of the root pile 1 through a pin. Concrete is poured into the prefabricated PHC pile 2 to form a post-cast column core 4.

[0029] The length of the prefabricated PHC pile 2 is 3 m.

[0030] See also Figure 2 As shown, the prefabricated PHC pile 2 includes a steel strand cage 21 sleeved on the outside of the lower end of the lattice column 3 and precast concrete, and the precast concrete covers the lower end of the lattice column 3 and the steel strand cage 21.

[0031] Continue reading Figure 2 As shown, the prefabricated PHC pile 2 further includes two end plates 22 , and the two end plates 22 are connected to the opposite ends of the steel strand cage 21 .

[0032] The end plate 22 at the lower end of the prefabricated PHC pile 2 is connected to the end plate at the upper end of the root pile 1 through pins.

[0033] The present invention provides a construction method for a retaining column pile structure in a dense urban agglomeration, comprising the following steps:

[0034] S1, pouring concrete into the prefabricated PHC pile 2 to form a post-cast column core 4.

[0035] (1) First, the lattice columns and root piles are processed according to the design drawings. The end plates at the upper ends of the root piles should be connected by pins.

[0036] (2) According to the design drawings, the steel strand cage of the prefabricated PHC pipe pile at the lower end of the lattice column is processed, and the lattice column and the steel strand cage are welded into a whole, and the tail end plate is installed. Note that the tail end plate should also be connected by pins.

[0037] (3) The lower end of the lattice column and the steel strand cage are placed in a mold, poured with concrete of designed strength and centrifuged into prefabricated PHC piles.

[0038] (4) After the precast section is steam-cured, the lattice column + precast PHC pile are transported to the construction site for core pouring. Note that air holes must be reserved before core pouring. PVC pipes or galvanized steel pipes can be used to penetrate the precast concrete section.

[0039] S2. Connect the upper end of the root pile 1 to the lower end of the prefabricated PHC pipe pile 2 through a pin to form a protective column pile structure in a dense urban cluster.

[0040] S3. Lift the retaining column pile structure in dense urban clusters and carry out pile construction.

[0041] After the core filling is completed, a crawler-type root pile driver is used for column construction. Note that during the drilling process, the hole must be drilled to a depth of about 50cm below the design elevation to offset the buoyancy of the surrounding mud during the pile planting process. After maintenance is completed, excavation and foundation pit support and enclosure construction will begin.

[0042] The concrete part of the pile structure of the retaining column in the dense urban agglomeration is calculated according to the actual situation of the project. The specifications of the lattice column are obtained by calculation. Then the lattice column and the prefabricated PHC pipe pile are processed into a whole in advance by the manufacturer. After steam curing, they are transported to the site for core filling. When filling the core, air holes should be reserved in the middle to facilitate the exhaust of the bottom of the pipe during the piling construction. In addition, because the pure lattice column section of the general project is relatively long, it is convenient for transportation. The concrete section connecting the prefabricated PHC pipe pile and the lattice column is processed into 3m to meet the anchoring length of the lattice column. The bamboo section of the prefabricated PHC pipe pile and the root pile is connected by pins and welding.

[0043] The present invention's retaining column pile structure in dense urban agglomerations greatly reduces the amount of mud discharged during construction by using the lower concrete force system as the root pile. The overall components can be processed on site, shortening the construction period and saving construction costs. The lattice column and the root pile form a whole, and then the core is poured. The overall force system is stable, which solves the shortcomings of conventional practices from two aspects.

[0044] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. A retaining column pile structure in a dense urban agglomeration, characterized in that: It comprises rooted piles, prefabricated PHC pipe piles and lattice columns, wherein the lower end of the lattice column is buried in the prefabricated PHC pipe pile, the lower end of the prefabricated PHC pipe pile is connected to the upper end of the rooted pile through a pin, and concrete is poured into the prefabricated PHC pipe pile to form a post-cast column core.

2. The retaining column pile structure in dense urban agglomerations according to claim 1 is characterized in that: The length of the prefabricated PHC pile is 3m.

3. The retaining column pile structure in a dense urban agglomeration according to claim 1 is characterized in that: The prefabricated PHC pipe pile comprises a steel wire cage sleeved on the outside of the lower end of the lattice column and precast concrete, and the precast concrete covers the lower end of the lattice column and the steel wire cage.

4. The retaining column pile structure in a dense urban agglomeration according to claim 3 is characterized in that: The prefabricated PHC pile further includes two end plates connected to opposite ends of the steel strand cage.

5. The retaining column pile structure in a dense urban agglomeration according to claim 4, characterized in that: The end plate at the lower end of the prefabricated PHC pipe pile is connected to the end plate at the upper end of the root pile through pins.

6. A construction method for a retaining column pile structure in a dense urban agglomeration as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Pour concrete into the prefabricated PHC piles to form post-cast column cores; Connecting the upper end of the root pile to the lower end of the prefabricated PHC pipe pile through a pin to form a retaining column pile structure in a dense urban cluster; Lift the retaining column pile structure in dense urban agglomerations and carry out pile planting construction.

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