Lateral horizontal force resisting shaft connecting structure of high-strength prefabricated pipe pile

Abstract

The utility model discloses a lateral horizontal force resistant shaft connection structure of a high-strength prefabricated pipe pile, which comprises an upper-stage pipe pile, an inner support flange pipe and a lower-stage pipe pile which are axially spliced from top to bottom in sequence, and two ends of the inner support flange pipe are respectively and axially inserted into inner support pipes in the upper-stage pipe pile and the lower-stage pipe pile. A flange backing ring protruding in the radial direction is integrally and fixedly arranged on the middle section of the inner supporting flange pipe. The outer diameter of the flange backing ring is the same as that of the upper-stage pipe pile and the lower-stage pipe pile, and the flange backing ring is axially connected with a split bolt in a penetrating manner; the two ends of the split bolt are axially embedded into the upper-stage pipe pile and the lower-stage pipe pile correspondingly and are axially and oppositely pulled and fixed. According to the connecting structure, a radial protruding part is prevented from being formed on the pile body in an embedded shaft connecting mode, and in addition, the inner wall of the pipe pile is internally supported so as to increase the radial load strength of the shaft connecting position of the pipe pile.

Description

Technical Field

[0001] The utility model relates to the technical field of pile construction, and specifically relates to an axial connection structure of a high-strength prefabricated pipe pile for resisting lateral horizontal forces. Background Art

[0002] High-strength prestressed concrete pipe piles have the characteristics of fast construction speed, short construction period and reliable quality. Especially when using the static pressure method to sink piles, the construction has the advantages of no noise, no vibration, and a clean site. Therefore, they are widely used in the field of pile foundation construction. The technology is mature and reliable, and has achieved good social and economic benefits.

[0003] However, due to complex engineering geological conditions and construction reasons, sometimes during the acceptance inspection of engineering piles, the radial force at the radial axis connection of the pipe pile cannot meet the design requirements. Once the pipe pile connection is broken, its vertical bearing capacity will be seriously affected.

[0004] Generally speaking, the main reasons for the insufficient bearing capacity of pipe piles are:

[0005] 1. The pile connection adopts flange connection, and the outer diameter of the flange is larger than the outer diameter of the pile body. When the pile is lowered, the flange and the axially connected bolts on it collide with the inner wall of the pile hole and are damaged, resulting in axial connection defects.

[0006] 2. There are faults in the construction geology, and the radial force on the pipe piles at the junction of different geological layers is relatively large. Once the pipe piles at this location are the axial connection positions of the segmental piles, it will cause a large radial force interference to the connection structure.

[0007] In summary, how to design a new shaft connection structure for high-strength prefabricated pipe piles to solve the problem of poor lateral horizontal force bearing capacity of the shaft connection between the two-stage pipe piles has become a technical problem that needs to be solved urgently by people in this field. Utility Model Content

[0008] The purpose of the utility model is to overcome the shortcomings of the prior art and provide an axial connection structure of a high-strength prefabricated pipe pile that can resist lateral horizontal forces. The connection structure adopts an embedded shaft connection method to avoid forming radial protrusions on the pile body. In addition, the inner wall of the pipe pile is internally supported to increase the radial load strength of the pipe pile shaft connection position.

[0009] A high-strength prefabricated pipe pile axial connection structure for resisting lateral horizontal forces comprises an upper pipe pile, an inner support flange pipe and a lower pipe pile axially spliced ​​in sequence from top to bottom, wherein the two ends of the inner support flange pipe are made as inner support pipes axially inserted into the upper pipe pile and the lower pipe pile respectively, and the middle section of the inner support flange pipe is integrally provided with a radially protruding flange gasket; the outer diameter of the flange gasket is the same as that of the upper pipe pile and the lower pipe pile, and the flange gasket is axially penetrated by a connecting tension bolt; the two ends of the tension bolt are axially embedded in the upper pipe pile and the lower pipe pile respectively and axially tensioned and fixed.

[0010] Preferably, a plurality of radially inwardly concave embedding grooves are provided on the circumferential outer walls of the shaft connection ends of the upper pipe pile and the lower pipe pile, and the connecting tension bolts are axially penetrated through the embedding grooves.

[0011] Preferably, the inner support pipes at both ends of the inner support flange pipe are radially supported on the arc-surface inner walls of the upper pipe pile and the lower pipe pile respectively.

[0012] The advantages and technical effects of the utility model are:

[0013] The utility model discloses a shaft connection structure of a high-strength prefabricated pipe pile for resisting lateral horizontal force, which is used for axial connection between an upper pipe pile and a lower pipe pile to achieve:

[0014] 1. By connecting the tension bolts inside the radially sunken groove, the outer diameter of the pipe pile is ensured to be uniform, so as to avoid the radial protrusions on the pipe pile from interfering with or being stressed by the inner wall of the pile hole when the pile is lowered, and to avoid damaging the axial connection structure of the pipe pile.

[0015] 2. The flange gasket of the inner support flange pipe is used to axially separate the upper pipe pile and the lower pipe pile and rigidly connect them with the tension bolts; in addition, the inner support pipes at both ends of the inner support flange pipe are used to radially support the inner walls of the upper pipe pile and the lower pipe pile to increase the maximum radial force load at the connection position of the pipe pile shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the pipe pile shaft connection position of the utility model;

[0017] Figure 2 It is a half-section view of the utility model;

[0018] In the figure: 1-upper pipe pile; 2-embedded groove; 3-tension bolt; 4-flange gasket; 5-lower pipe pile; 6-inner support flange pipe. DETAILED DESCRIPTION

[0019] In order to further understand the content, features and effects of the utility model, the following embodiments are given as examples and described in detail with the accompanying drawings. It should be noted that the embodiments are descriptive, not restrictive, and the protection scope of the utility model cannot be limited thereby.

[0020] A high-strength prefabricated pipe pile axial connection structure for resisting lateral horizontal forces comprises an upper pipe pile 1, an inner support flange pipe 6 and a lower pipe pile 5 which are axially spliced ​​in sequence from top to bottom, wherein the two ends of the inner support flange pipe are made as inner support pipes which are axially inserted into the upper pipe pile and the lower pipe pile respectively, and the middle section of the inner support flange pipe is integrally provided with a radially protruding flange gasket 4; the outer diameter of the flange gasket is the same as that of the upper pipe pile and the lower pipe pile, and the flange gasket is axially penetrated by a connecting tension bolt 3; the two ends of the tension bolt are axially embedded in the upper pipe pile and the lower pipe pile respectively and axially tensioned and fixed.

[0021] Preferably, a plurality of radially inwardly concave embedding grooves 2 are provided on the circumferential outer walls of the shaft connection ends of the upper pipe pile and the lower pipe pile, and the connecting tension bolts are axially penetrated in the embedding grooves.

[0022] Preferably, the inner support pipes at both ends of the inner support flange pipe are radially supported on the arc-surface inner walls of the upper pipe pile and the lower pipe pile respectively.

[0023] In order to more clearly describe the specific implementation of the utility model, an embodiment is provided below:

[0024] The utility model discloses a shaft connection structure of a high-strength prefabricated pipe pile for resisting lateral horizontal force, which is used for the shaft connection countersink construction of deep well pipe piles. Radially concave embedding grooves are evenly distributed on the circumferential outer walls of the upper pipe pile and the lower pipe pile end, and axially penetrate the embedding grooves to connect tension bolts, thereby replacing the tension bolt connection method of the radially convex flange connection plate on the outside of the pipe pile in the prior art, avoiding deformation or damage of the flange connection plate after acceptance, which affects the service life of the pipe pile and the radial bearing capacity, thereby ensuring the uniformity of the outer diameters of the upper pipe pile, the lower pipe pile and the flange gasket.

[0025] On the other hand, both ends of the inner support flange pipe extend into and are supported inside the upper pipe pile and the lower pipe pile, so as to distribute the radial force of the tension bolts and avoid deformation of the axial connection position of the upper pipe pile and the lower pipe pile.

[0026] Finally, all the undescribed parts of the present invention adopt mature products and mature technical means in the prior art.

[0027] The method disclosed and proposed by the utility model can be realized by those skilled in the art by referring to the content of this article and appropriately changing the conditions, routes and other links. Although the method and preparation technology of the utility model have been described by preferred embodiments, relevant technical personnel can obviously modify or recombine the method and technical route of this article without departing from the content, spirit and scope of the utility model to achieve the final preparation technology. It is particularly important to point out that all similar substitutions and modifications are obvious to those skilled in the art, and they are all deemed to be included in the spirit, scope and content of the utility model. And it should be understood that for those of ordinary skill in the art, improvements or changes can be made according to the above description, and all these improvements and changes should belong to the scope of protection of the claims attached to the utility model.

Claims

1. A shaft connection structure for high-strength prefabricated pipe piles to resist lateral horizontal forces, characterized in that: It comprises an upper pipe pile, an inner support flange pipe and a lower pipe pile which are axially spliced ​​in sequence from top to bottom, wherein the two ends of the inner support flange pipe are made as inner support pipes which are axially inserted into the upper pipe pile and the lower pipe pile respectively, and the middle section of the inner support flange pipe is integrally provided with a radially protruding flange gasket; the outer diameter of the flange gasket is the same as that of the upper pipe pile and the lower pipe pile, and the flange gasket is axially penetrated by connecting tension bolts; the two ends of the tension bolts are axially embedded in the upper pipe pile and the lower pipe pile respectively and axially tensioned and fixed.

2. The shaft connection structure of a high-strength prefabricated pipe pile for resisting lateral horizontal force according to claim 1 is characterized in that: A plurality of radially inwardly concave embedding grooves are provided on the circumferential outer walls of the shaft connection ends of the upper and lower pipe piles, and the connecting tension bolts are axially penetrated in the embedding grooves.

3. The shaft connection structure of a high-strength prefabricated pipe pile for resisting lateral horizontal force according to claim 1 is characterized in that: The inner support pipes at both ends of the inner support flange pipe are radially supported on the arc surface inner walls of the upper pipe pile and the lower pipe pile respectively.

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