Sliding type spiral steel pipe-cement soil combined pile

Abstract

The utility model discloses a sliding type spiral steel pipe-cement soil combined pile which comprises a steel pipe. The steel ring cylinder is arranged on the outer wall of the steel pipe in a sliding and sleeving mode, a plurality of sliding assemblies are installed on the inner wall of the steel ring cylinder, the sliding assemblies are in sliding fit with the steel pipe, and spiral blades are fixedly connected to the outer wall of the steel ring cylinder; wherein an elastic assembly is installed in the wall thickness of the steel pipe, and the elastic assembly is fixedly connected with the sliding assembly. Stable and unchanged welding connection between the spiral blade and the steel pipe in the spiral steel pipe-cement soil composite pile is converted into sliding connection, more loads are transmitted to the spiral blade on the lower portion through relative sliding among the spiral blade, the steel cylinder ring and the steel pipe, stress is redistributed, and the stress distribution effect is improved. The purpose that loads are evenly distributed along the full length of a pile body is achieved, and the problem that stress is concentrated at the connecting position of an original upper spiral blade and a steel pipe is greatly solved.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering, in particular to a sliding type spiral steel pipe-cement soil composite pile. Background Art

[0002] In the infrastructure construction of various projects, pile foundations can often provide considerable bearing capacity, but this is accompanied by high construction costs and huge consumption of energy and materials. In some engineering construction projects that only require a smaller bearing capacity, such as the construction of photovoltaic power stations on coastal mudflats, a large amount of resources are often wasted in order to meet the minimum requirements of the specifications. At this time, if you choose to use rigid cement-soil composite piles, it will greatly reduce the cost and energy consumption.

[0003] Reinforced cement-soil composite pile is a new type of composite pile in which the reinforced core pile is vertically implanted into the cement-soil mixing pile after the construction of the cement-soil mixing pile is completed, so that the outer periphery is wrapped by cement soil. It has the larger pile side friction resistance of the cement-soil mixing pile and the higher strength and stiffness of the core pile.

[0004] At present, the core piles of the reinforced cement-soil composite piles are in the form of pipe piles, steel pipes, spiral steel pipes, etc. Among them, for the reinforced cement-soil composite piles with spiral steel pipes as the inner core, the load they bear is mostly concentrated on the upper spiral blades, and there is a stress concentration phenomenon at the welding position between the steel pipe and the spiral blades, while the load shared by the lower spiral blades is too small. Therefore, the utility model proposes a sliding spiral steel pipe-cement-soil composite pile, in order to transfer more loads through the relative sliding between the spiral blades and the steel pipes, greatly alleviate the stress concentration problem at the connection between the upper spiral blades and the steel pipes, and better conform to the load transfer theory of the reinforced cement-soil composite piles. Utility Model Content

[0005] The utility model aims to provide a sliding type spiral steel pipe-cement soil composite pile to solve the problems existing in the prior art.

[0006] To achieve the above purpose, the utility model provides the following solution: The utility model provides a sliding type spiral steel pipe-cement soil composite pile, including:

[0007] Steel pipe;

[0008] A steel ring cylinder, the steel ring cylinder is slidably sleeved on the outer wall of the steel pipe, a plurality of sliding components are installed on the inner wall of the steel ring cylinder, the sliding components and the steel pipe are slidably matched, and a spiral blade is fixedly connected to the outer wall of the steel ring cylinder;

[0009] A limit assembly, wherein the limit assembly is mounted on the steel pipe and is in limit cooperation with the steel ring tube;

[0010] Wherein, an elastic component is installed in the wall thickness of the steel pipe, and the elastic component is fixedly connected to the sliding component.

[0011] According to the sliding type spiral steel pipe-cement soil composite pile provided by the utility model, a plurality of tenons are opened on the side wall of the steel pipe at equal intervals in the circumferential direction, the tenons are arranged along the axial direction of the steel pipe, a plurality of the tenons are arranged in one-to-one correspondence with a plurality of the sliding components, and the sliding components are slidably connected in the tenons.

[0012] According to the sliding type spiral steel pipe-cement soil composite pile provided by the utility model, the sliding component includes a tenon fixedly connected to the inner wall of the steel ring tube, the tenon is slidably connected in the tenon groove, the end of the tenon away from the steel ring tube is fixedly connected to a limiting piece, the tenon is limitedly matched with the steel ring tube through the limiting piece, and the elastic component is fixedly connected to the tenon.

[0013] According to the sliding type spiral steel pipe-cement soil composite pile provided by the utility model, the limiting member includes symmetrically arranged limiting steel bars, and the two limiting steel bars are symmetrically fixedly connected to the opposite side surfaces of the tenon.

[0014] According to the sliding type spiral steel pipe-cement soil composite pile provided by the utility model, the elastic component includes a spring fixedly connected to the inner wall thickness of the steel pipe, and one end of the spring is fixedly connected to the top surface of the tenon.

[0015] According to the sliding type spiral steel pipe-cement soil composite pile provided by the utility model, the limiting assembly includes two blocking protrusions fixedly connected to the outer wall of the steel pipe, and the steel ring tube is arranged between the two blocking protrusions and cooperates with the two blocking protrusions to limit the position.

[0016] According to the sliding type spiral steel pipe-cement soil composite pile provided by the utility model, the steel ring tube includes two symmetrically arranged semicircular steel sleeves, the two semicircular steel sleeves are detachably connected, and the spiral blades are fixedly connected to the outer walls of the two semicircular steel sleeves.

[0017] According to the sliding type spiral steel pipe-cement soil composite pile provided by the utility model, flange ear plates are respectively fixedly connected to the two semicircular steel sleeves, and the flange ear plates of the two semicircular steel sleeves are fixedly connected by bolts.

[0018] The utility model discloses the following technical effects:

[0019] When the utility model is working, firstly, the underground obstacles in the construction area of ​​the combined pile are detected, and the obstacles are cleared, the site is leveled, and the soil is compacted in layers; the earthwork is excavated to the designed elevation, and the positioning is measured and laid out as required, and permanent and temporary marks are made; then the three-axis mixing pile hole is positioned, the pile driver is in place, cement slurry is prepared and injected as required, and the sinking and lifting speed of the mixing pile driver is controlled as required to form a cement soil mixing pile; finally, the steel ring tube is installed on the steel pipe to form a spiral steel pipe inner core pile, the pile position, the verticality of the pile body and the elevation are ensured, and the pile is rotated and implanted into the outer core cement soil mixing pile.

[0020] The utility model transforms the stable and unchanged welding connection between the spiral blades and the steel pipe in the spiral steel pipe-cement soil composite pile into a slidable connection, and transmits the load to the lower spiral blades more through the relative sliding between the spiral blades, the steel cylinder ring and the steel pipe, and redistributes the stress at the same time to achieve the purpose of uniform distribution of the load along the entire length of the pile body. It greatly alleviates the problem of stress concentration at the connection between the original upper spiral blades and the steel pipe, and better conforms to the load transfer theory of the rigid cement soil composite pile. It can better provide compressive bearing capacity when the steel ring cylinder moves upward relative to the steel pipe, and can also better provide pull-out bearing capacity when it moves downward relatively. It has better bearing performance, saves materials, and reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is an axonometric view of the sliding type spiral steel pipe-cement soil composite pile of the utility model;

[0023] Figure 2 This is a schematic diagram of the matching relationship between the spiral blade and the steel ring cylinder of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the steel pipe of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the positioning component of the utility model.

[0026] Among them, 1. spiral blade; 2. steel ring cylinder; 3. flange ear plate; 4. bolt; 5. steel pipe; 6. blocking protrusion; 7. tenon; 8. mortise and tenon; 9. spring; 10. limiting steel bar. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Reference Figure 1-4 The utility model provides a sliding type spiral steel pipe-cement soil composite pile, comprising:

[0030] Steel pipe 5;

[0031] The steel ring cylinder 2 is slidably sleeved on the outer wall of the steel pipe 5. A plurality of sliding components are installed on the inner wall of the steel ring cylinder 2. The sliding components and the steel pipe 5 are slidably matched. The outer wall of the steel ring cylinder 2 is fixedly connected with a spiral blade 1.

[0032] A limit assembly is installed on the steel pipe 5, and the limit assembly cooperates with the steel ring tube 2;

[0033] Among them, an elastic component is installed in the wall thickness of the steel pipe 5, and the elastic component is fixedly connected to the sliding component.

[0034] When the utility model is working, firstly, the underground obstacles in the construction area of ​​the combined pile are detected, and the obstacles are cleared, the site is leveled, and the soil is compacted in layers; the earthwork is excavated to the designed elevation, and the positioning is measured and laid out as required, and permanent and temporary marks are made; then the three-axis mixing pile hole is positioned, the pile driver is in place, cement slurry is prepared and injected as required, and the sinking and lifting speed of the mixing pile driver is controlled as required to form a cement soil mixing pile; finally, the steel ring tube is installed on the steel pipe to form a spiral steel pipe inner core pile, the pile position, the verticality of the pile body and the elevation are ensured, and the pile is rotated and implanted into the outer core cement soil mixing pile.

[0035] The utility model transforms the stable and unchanging welding connection between the spiral blade 1 and the steel pipe 5 in the spiral steel pipe 5-cement soil composite pile into a slidable connection, and transmits the load to the lower spiral blade 1 more through the relative sliding between the spiral blade 1, the steel cylinder ring and the steel pipe 5, and redistributes the stress at the same time to achieve the purpose of uniform distribution of the load along the entire length of the pile body. It greatly alleviates the problem of stress concentration at the connection between the original upper spiral blade 1 and the steel pipe 5, and better conforms to the load transfer theory of the rigid cement soil composite pile. It can better provide compressive bearing capacity when the steel ring cylinder 2 moves upward relative to the steel pipe 5, and can also better provide pull-out bearing capacity when it moves downward relatively. It has better bearing performance, saves materials, and reduces energy consumption.

[0036] A further optimization scheme is that a plurality of tenons 8 are opened at equal intervals on the side wall of the steel pipe 5 in a circumferential direction, the tenons 8 are arranged along the axial direction of the steel pipe 5, and the plurality of tenons 8 are arranged correspondingly to a plurality of sliding components, and the sliding components are slidably connected in the tenons 8.

[0037] A further optimized solution is that the sliding assembly includes a tenon 7 fixedly connected to the inner wall of the steel ring tube 2, the tenon 7 is slidably connected in the tenon groove 8, the end of the tenon 7 away from the steel ring tube 2 is fixedly connected to a limiting piece, the tenon 7 is limited by the limiting piece and cooperates with the steel ring tube 2, and the elastic assembly is fixedly connected to the tenon 7.

[0038] According to a further optimized solution, the limiting member includes symmetrically arranged limiting steel bars 10 , and the two limiting steel bars 10 are symmetrically fixedly connected to the opposite side surfaces of the tenon 7 .

[0039] The tenon 7 is positioned and fixed by setting the limiting steel bar 10 to prevent the tenon 7 from slipping out of the tenon groove 8, thereby ensuring the stability of the connection between the tenon 7 and the tenon groove 8.

[0040] In a further optimized solution, the elastic component includes a spring 9 fixedly connected to the inner wall thickness of the steel pipe 5, and the top surface of the tenon 7 at one end of the spring 9 is fixedly connected. It should be noted that the tenon groove 8 is arranged in a teardrop shape from top to bottom, that is, the diameter of the upper end of the tenon groove 8 is smaller than the diameter of the lower end, so that a gradual stress change can be formed to ensure the stability of the base.

[0041] In a further optimized solution, the limiting assembly includes two blocking protrusions 6 fixedly connected to the outer wall of the steel pipe 5, and the steel ring tube 2 is arranged between the two blocking protrusions 6 and is limited in position between the two blocking protrusions 6. The steel ring tube 2 is limited in position by the setting of the blocking protrusions 6 to limit its maximum displacement distance.

[0042] In a further optimized solution, the steel ring cylinder 2 includes two symmetrically arranged semicircular steel sleeves, which are detachably connected to each other, and the spiral blades 1 are fixedly connected to the outer walls of the two semicircular steel sleeves. The arrangement of the flange ear plate 3 facilitates the disassembly of the steel ring cylinder 2, thereby reducing the difficulty of installing the device.

[0043] According to a further optimized solution, flange ear plates 3 are respectively fixedly connected to the two semicircular steel sleeves, and the flange ear plates 3 of the two semicircular steel sleeves are fixedly connected by bolts 4.

[0044] An application method of a sliding spiral steel pipe-cement soil composite pile comprises the following steps:

[0045] Step 1: Detect underground obstacles in the construction area of ​​the composite pile, clear the obstacles, level the site, and compact it layer by layer;

[0046] Step 2: Excavate to the designed elevation, measure and position according to the requirements, and make permanent and temporary signs;

[0047] Step 3: Position the three-axis mixing pile hole, put the pile driver in place, prepare and inject cement slurry as required, control the sinking and lifting speed of the mixing pile driver as required, and form a cement-soil mixing pile;

[0048] Step 4: install the steel ring tube 1 on the steel pipe 5 to form a spiral steel pipe inner core pile, ensure the pile position, verticality and elevation of the pile body, and rotate it to implant it into the outer core cement soil mixing pile.

[0049] Example 2

[0050] In this embodiment, the tenon 8 of the steel pipe 5 is symmetrically arranged in a diamond shape, and an annular barrier protrusion is arranged on the outer surface of the steel pipe 1 at a certain distance below the tenon 8, so that the tenon 7 on the inner surface of the steel ring tube 2 can be placed in the center of the diamond, and the pile body can provide better compressive bearing capacity while also providing better tensile bearing capacity.

[0051] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A sliding type spiral steel pipe-cement soil composite pile, characterized in that: include: Steel pipe (5); A steel ring cylinder (2), the steel ring cylinder (2) is slidably sleeved on the outer wall of the steel pipe (5), a plurality of sliding components are installed on the inner wall of the steel ring cylinder (2), the sliding components and the steel pipe (5) are slidably matched, and a spiral blade (1) is fixedly connected to the outer wall of the steel ring cylinder (2); A limit assembly, the limit assembly being mounted on the steel pipe (5), and the limit assembly and the steel ring tube (2) being in limit cooperation with each other; Wherein, an elastic component is installed in the wall thickness of the steel pipe (5), and the elastic component is fixedly connected to the sliding component.

2. The sliding type spiral steel pipe-cement soil composite pile according to claim 1, characterized in that: A plurality of tenons (8) are provided at equal intervals on the side wall of the steel pipe (5) in the circumferential direction. The tenons (8) are arranged along the axial direction of the steel pipe (5). The plurality of tenons (8) are arranged in one-to-one correspondence with the plurality of sliding components. The sliding components are slidably connected in the tenons (8).

3. The sliding type spiral steel pipe-cement soil composite pile according to claim 2, characterized in that: The sliding component comprises a tenon (7) fixedly connected to the inner wall of the steel ring tube (2), the tenon (7) being slidably connected in the tenon groove (8), the end of the tenon (7) away from the steel ring tube (2) being fixedly connected to a limiting member, the tenon (7) being limitedly matched with the steel ring tube (2) through the limiting member, and the elastic component being fixedly connected to the tenon (7).

4. The sliding type spiral steel pipe-cement soil composite pile according to claim 3, characterized in that: The limiting member comprises symmetrically arranged limiting steel bars (10), and the two limiting steel bars (10) are symmetrically fixedly connected to the opposite side surfaces of the tenon (7).

5. The sliding type spiral steel pipe-cement soil composite pile according to claim 3, characterized in that: The elastic component comprises a spring (9) fixedly connected within the wall thickness of the steel pipe (5), and one end of the spring (9) is fixedly connected to the top surface of the tenon (7).

6. The sliding type spiral steel pipe-cement soil composite pile according to claim 1, characterized in that: The limiting assembly comprises two blocking protrusions (6) fixedly connected to the outer wall of the steel pipe (5); the steel ring tube (2) is arranged between the two blocking protrusions (6) and is limitedly matched with the two blocking protrusions (6).

7. The sliding type spiral steel pipe-cement soil composite pile according to claim 1, characterized in that: The steel ring cylinder (2) comprises two symmetrically arranged semicircular steel sleeves, the two semicircular steel sleeves are detachably connected, and the spiral blades (1) are fixedly connected to the outer walls of the two semicircular steel sleeves.

8. The sliding type spiral steel pipe-cement soil composite pile according to claim 7, characterized in that: The two semicircular steel sleeves are respectively fixedly connected with flange ear plates (3), and the flange ear plates (3) of the two semicircular steel sleeves are fixedly connected by bolts (4).

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