Prefabricated pipe pile section bearing capacity enhancing structure and construction method

Abstract

The invention discloses a prefabricated pipe pile section bearing capacity enhancing structure and a construction method. The prefabricated pipe pile section bearing capacity enhancing structure comprises a prestressed concrete pipe pile composed of a plurality of prefabricated pipe joints, and a built-in steel member is arranged in the uppermost prefabricated pipe joint; the built-in steel member is solidified by injecting concrete and comprises a web plate, a bottom sealing plate and a plurality of blades; the web plate is of a strip-shaped structure with a cross-shaped cross section, a circular bottom sealing plate is arranged at the downward end of the web plate, and a plurality of blades are arranged on each side edge of the web plate in the length direction; each blade is in an arc shape matched with the inner wall of the corresponding position of the prefabricated pipe joint. During construction, the web plate, the bottom sealing plate and all the blades are combined into a built-in steel member, the built-in steel member is implanted into the uppermost prefabricated pipe section, and then grouting is conducted on the prestressed concrete pipe pile from bottom to top through the grouting pipe till grout emerges from the top. By means of the application, the construction speed of the prefabricated pipe pile can be higher, and the section bearing performance of the prestressed concrete pipe pile can be remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated pipe pile construction, and in particular to a prefabricated pipe pile cross-section bearing capacity enhancement structure and a construction method. Background Art

[0002] Prestressed concrete pipe piles are a commonly used pile foundation form for large structures such as buildings and bridges. They are produced in an industrialized manner and have the advantages of reliable quality, fast construction, and high economy.

[0003] However, due to factors such as the thinner wall thickness of the pipe pile and the smaller diameter of the stirrup wire, the bending and shear bearing capacity of the pipe pile section is generally smaller than that of bored cast-in-place piles with the same outer diameter, which limits the application scope of the pipe pile.

[0004] Therefore, how to speed up the construction of prefabricated pipe piles and improve the cross-sectional bearing capacity of prestressed concrete pipe piles has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the present invention provides a prefabricated pipe pile cross-sectional bearing capacity enhancement structure and a construction method, the purpose of which is to speed up the construction of prefabricated pipe piles and improve the cross-sectional bearing performance of prestressed concrete pipe piles.

[0006] To achieve the above-mentioned purpose, the present invention discloses a prefabricated pipe pile cross-section bearing capacity enhancement structure, comprising a prestressed concrete pipe pile composed of a plurality of prefabricated pipe sections, wherein the uppermost prefabricated pipe section is provided with a built-in steel member;

[0007] The built-in steel member is consolidated by injecting concrete into the uppermost prefabricated pipe section, and includes a web plate, a bottom plate and a plurality of blades;

[0008] The web is a strip-shaped structure with a cross-shaped cross section, and the straight line formed by the intersection of the cross along the length direction is coaxially arranged with the prefabricated pipe segment;

[0009] The downward end of the web is provided with a circular bottom cover plate;

[0010] Each side of the web is provided with a plurality of blades along the length direction;

[0011] Each of the blades is in an arc shape matching the inner wall at a corresponding position of the prefabricated pipe segment.

[0012] Preferably, the outer diameter of the bottom sealing plate is in clearance fit with the prefabricated pipe segment.

[0013] Preferably, each of the blades is provided with a plurality of openings.

[0014] Preferably, the web, the bottom cover plate and all the blades are fixed as a whole by welding.

[0015] Preferably, the concrete has micro-expansion properties.

[0016] The present invention also provides a construction method for a prefabricated pipe pile cross-section bearing capacity enhancement structure, comprising the following steps:

[0017] Step 1: prefabricate all prefabricated pipe segments, webs, bottom plates and all blades in the factory;

[0018] Step 2: constructing all the prefabricated pipe segments on site by driving or implanting them to form prestressed concrete pipe piles;

[0019] Step 3, assembling the web, the bottom cover and all the blades into a built-in steel component on site, and implanting the built-in steel component into the designed elevation position in the uppermost prefabricated pipe segment;

[0020] Step 4: inject grout into the prestressed concrete pile from bottom to top through a grouting pipe until grout appears at the top.

[0021] Beneficial effects of the present invention:

[0022] The application of the present invention can not only make the construction speed of the prefabricated pipe pile faster, but also significantly improve the cross-sectional bearing performance of the prestressed concrete pipe pile.

[0023] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a prefabricated pipe segment in one embodiment of the present invention is shown.

[0025] Figure 2 A schematic longitudinal section diagram showing an uppermost prefabricated pipe section provided with an internal steel member in one embodiment of the present invention is shown.

[0026] Figure 3 A schematic diagram of the end surface structure of an uppermost prefabricated pipe section in an embodiment of the present invention is shown, in which a built-in steel component is provided inside.

[0027] Figure 4 A schematic longitudinal section diagram is shown of a steel component built into an uppermost prefabricated pipe segment after being solidified with concrete in one embodiment of the present invention.

[0028] Figure 5 A schematic diagram of the end surface structure of the uppermost prefabricated pipe segment after the built-in steel member is solidified with concrete in one embodiment of the present invention is shown. DETAILED DESCRIPTION

[0029] Example

[0030] like Figure 4 and Figure 5 As shown, the prefabricated pipe pile cross-section bearing capacity enhancement structure includes a prestressed concrete pipe pile composed of a plurality of prefabricated pipe sections 1, and a built-in steel member is provided in the uppermost prefabricated pipe section 1;

[0031] The internal steel structure is consolidated by injecting concrete 5 into the uppermost prefabricated pipe section 1, and includes a web 2, a bottom cover 3 and a plurality of blades 4;

[0032] The web 2 is a strip structure with a cross-shaped cross section, and the straight line formed by the intersection of the cross along the length direction is coaxially arranged with the prefabricated pipe segment 1;

[0033] A circular bottom plate 3 is provided at the downward end of the web 2;

[0034] Each side of the web 2 is provided with a plurality of blades 4 along the length direction;

[0035] Each blade 4 is in an arc shape matching the inner wall at a corresponding position of the prefabricated pipe segment 1 .

[0036] The built-in steel components of the present invention can be manufactured and assembled in advance and then implanted on site into the uppermost prefabricated pipe segment 1, so the construction speed is faster. In addition, the built-in steel components in the uppermost prefabricated pipe segment 1 solidified by concrete 5 form a composite cross-section with the corresponding prefabricated pipe segment 1, thereby significantly improving the cross-sectional bearing performance of the prestressed concrete pipe pile.

[0037] In some embodiments, the outer diameter of the bottom cover plate 3 is clearance-fitted with the prefabricated pipe segment 1 .

[0038] In some embodiments, each blade 4 is provided with a plurality of openings.

[0039] In practical applications, the web 2 and blades 4 of the cross-shaped strip structure have openings, which can form a shear pin effect after grouting, ensuring that the inner core and the pile wall are stressed together, thereby achieving the goal of significantly improving the bearing capacity of the pile.

[0040] In some embodiments, the web 2, the bottom cover 3 and all the blades 4 are fixed as one body by welding.

[0041] In certain embodiments, the concrete has micro-expansive properties.

[0042] like Figures 1 to 5 As shown, the present invention also provides a construction method for a prefabricated pipe pile cross-section bearing capacity enhancement structure, comprising the following steps:

[0043] Step 1, prefabricate all prefabricated pipe segments 1, webs 2, bottom plates 3 and all blades 4 in a factory;

[0044] Step 2: construct all prefabricated pipe segments on site by driving or implanting them to form prestressed concrete pipe piles;

[0045] Step 3, on site, assemble the web 2, the bottom cover 3 and all the blades 4 into a built-in steel component, and implant it into the designed elevation position in the uppermost prefabricated pipe section 1;

[0046] Step 4: inject grout from the bottom to the top of the prestressed concrete pile 1 through the grouting pipe until grout appears at the top.

[0047] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A prefabricated pipe pile cross-section bearing capacity enhancement structure, comprising a prestressed concrete pipe pile composed of a plurality of prefabricated pipe sections (1); characterized in that: The uppermost prefabricated pipe section (1) is provided with an internal steel component; The built-in steel component is consolidated by injecting concrete (5) into the uppermost prefabricated pipe section (1), and includes a web (2), a bottom cover plate (3) and a plurality of blades (4); The web (2) is a strip-shaped structure with a cross-shaped cross section, and the straight line formed by the intersection of the cross along the length direction is coaxially arranged with the prefabricated pipe section (1); The downward end of the web (2) is provided with a circular bottom cover plate (3); Each side of the web (2) is provided with a plurality of blades (4) along the length direction; Each of the blades (4) is in an arc shape that matches the inner wall at a corresponding position of the prefabricated pipe section (1).

2. The prefabricated pipe pile cross-section bearing capacity enhancement structure according to claim 1 is characterized in that: The outer diameter of the bottom sealing plate (3) is clearance-matched with the prefabricated pipe section (1).

3. The prefabricated pipe pile cross-section bearing capacity enhancement structure according to claim 1 is characterized in that: Each of the blades (4) is provided with a plurality of openings.

4. The prefabricated pipe pile cross-section bearing capacity enhancement structure according to claim 1, characterized in that: The web (2), the bottom cover plate (3) and all the blades (4) are fixed together in one piece by welding.

5. The prefabricated pipe pile cross-section bearing capacity enhancement structure according to claim 1 is characterized in that: The concrete has a micro-expansion property.

6. A construction method for a prefabricated pipe pile cross-section bearing capacity enhancement structure, characterized in that: The following steps are involved: Step 1, prefabricate all prefabricated pipe segments (1), webs (2), bottom plates (3) and all blades (4) in a factory; Step 2: constructing all the prefabricated pipe segments on site by driving or implanting them to form prestressed concrete pipe piles; Step 3, assembling the web (2), the bottom cover plate (3) and all the blades (4) into a built-in steel component on site, and implanting it into the designed elevation position in the uppermost prefabricated pipe section (1); Step 4: inject grout from the bottom to the top of the prestressed concrete pile (1) through a grouting pipe until grout emerges from the top.

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