Stress coordination type spiral steel pipe-cement soil combined pile

Abstract

The utility model discloses a stress coordination type spiral steel pipe-cement soil combined pile which comprises a steel pipe, a steel ball, a steel ring cylinder, a spiral blade and a limiting assembly. The steel ring cylinder slidably sleeves the outer wall of the steel pipe; the spiral blade is mounted on the outer wall of the steel ring cylinder; the limiting assembly is installed on the steel pipe. The spiral blades are connected with the steel pipe in a sliding mode, loads are transmitted to the spiral blades on the lower portion in the load bearing process, stress is redistributed at the same time, the loads are evenly distributed, the problem of stress concentration at the connecting position of the spiral blades on the upper portion and the steel pipe is solved, the bearing performance is improved, and energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of civil engineering, in particular to a stress-coordinated 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 rigid core piles in the rigid cement-soil composite piles are in the form of pipe piles, steel pipes, spiral steel pipes, etc. Among them, for the rigid cement-soil composite piles with spiral steel pipes as the inner core, the load they bear is mostly concentrated on the upper spiral blades. There is stress concentration at the welding position between the steel pipe and the spiral blades, while the load shared by the lower spiral blades is too small.

[0005] Therefore, the utility model proposes a stress-coordinated spiral steel pipe-cement soil composite pile. Utility Model Content

[0006] The utility model aims to provide a stress-coordinated spiral steel pipe-cement soil composite pile, aiming to solve or improve at least one of the above-mentioned technical problems.

[0007] To achieve the above purpose, the utility model provides the following solution: The utility model provides a stress-coordinated spiral steel pipe-cement soil composite pile, including:

[0008] A steel pipe, wherein the outer wall of the steel pipe is provided with a plurality of first circular grooves;

[0009] Steel balls, wherein a plurality of the steel balls are provided; the plurality of the steel balls are respectively arranged in the plurality of the first circular grooves;

[0010] A steel ring cylinder, which is sleeved on the outer wall of the steel pipe and is slidably connected to the outer wall of the steel pipe; the steel ball abuts between the first circular groove and the inner wall of the steel ring cylinder;

[0011] A spiral blade, wherein the spiral blade is mounted on the outer wall of the steel ring cylinder;

[0012] A limit assembly is installed on the steel pipe, and the limit assembly and the steel ring tube are in limit cooperation.

[0013] According to the stress-coordinated 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.

[0014] According to the stress-coordinated spiral steel pipe-cement soil composite pile provided by the utility model, a plurality of second circular grooves are provided on the inner wall of the semicircular steel sleeve; and a plurality of the steel balls are respectively abutted between a plurality of the first circular grooves and a plurality of the second circular grooves.

[0015] According to the stress-coordinated spiral steel pipe-cement soil composite pile provided by the utility model, the steel ball is fixedly connected to the inner wall of the semicircular steel sleeve; a plurality of the steel balls are arranged in one-to-one correspondence with a plurality of the first circular grooves.

[0016] According to the stress-coordinated spiral steel pipe-cement soil composite pile provided by the utility model, a plurality of the first circular grooves are arranged at equal intervals along the outer wall of the steel pipe.

[0017] According to the stress-coordinated 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 detachably connected by bolts.

[0018] According to the stress-coordinated 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, the steel ring tube is arranged between the two blocking protrusions, and the steel ring tube and the two blocking protrusions are limitedly matched.

[0019] The utility model also provides an application method of the stress coordinated spiral steel pipe-cement soil composite pile, comprising the following steps:

[0020] 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;

[0021] Step 2: Excavate to the designed elevation, measure and position according to the requirements, and make permanent and temporary signs;

[0022] 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;

[0023] Step 4: Install the steel ring tube on the steel pipe to form a spiral steel pipe inner core pile, ensure the pile position, verticality and elevation of the pile body, and rotate it into the outer core cement soil mixing pile.

[0024] The utility model discloses the following technical effects:

[0025] The utility model transforms the stable and unchanged welding connection between the spiral blade and the steel pipe in the prior art into a sliding connection by arranging a plurality of steel balls and a plurality of first circular grooves; when the external load acts on the combined pile and gradually increases, a relative displacement will occur between the steel pipe and the steel ring tube, and the steel balls in the first circular grooves will draw a plurality of vertical marks on the outer wall of the steel pipe or the inner wall of the steel ring tube, thereby transferring the load to the lower spiral blade more through the relative sliding between the steel ring tube and the steel pipe, thereby reducing the concentration of local stress; at the same time, the process redistributes the stress, achieving the purpose of evenly distributing the load along the entire length of the pile body, greatly alleviating the problem of stress concentration at the connection between the upper spiral blade and the steel pipe in the prior art, and better conforming to the load transfer theory of the rigid cement-soil composite pile;

[0026] In the utility model, when the steel ring tube is displaced upward relative to the steel pipe, it can better provide compressive bearing capacity, and when it is displaced downward relative to the steel pipe, it can also better provide tensile bearing capacity, thereby exerting better bearing performance, saving materials and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 It is an axonometric diagram of the stress-coordinated spiral steel pipe-cement soil composite pile of the utility model;

[0029] Figure 2 This is a schematic diagram of the installation of the first circular groove and the steel ball in the utility model;

[0030] Figure 3 It is a schematic diagram of the steel ring cylinder and the second circular groove in the utility model;

[0031] Among them, 1. spiral blade; 2. steel ring cylinder; 3. flange ear plate; 4. bolt; 5. steel pipe; 6. barrier protrusion; 7. first circular groove; 8. steel ball; 9. second circular groove. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] Reference Figure 1-3 The utility model provides a stress-coordinated spiral steel pipe-cement soil composite pile, comprising:

[0035] A steel pipe 5, the outer wall of which is provided with a plurality of first circular grooves 7; in this embodiment, the steel pipe 5 is a steel pipe for construction structure;

[0036] Steel balls 8, a plurality of steel balls 8 are provided; the plurality of steel balls 8 are respectively arranged in the plurality of first circular grooves 7; in this embodiment, the steel balls 8 are steel round balls, and the plurality of steel balls 8 are symmetrically and slightly pressed into the plurality of first circular grooves 7;

[0037] The steel ring cylinder 2 is sleeved on the outer wall of the steel pipe 5, and the steel ring cylinder 2 is slidably connected to the outer wall of the steel pipe 5; the steel ball 8 abuts between the first circular groove 7 and the inner wall of the steel ring cylinder 2;

[0038] The spiral blade 1 is mounted on the outer wall of the steel ring tube 2; in this embodiment, the parameters and dimensions of the spiral blade 1 are designed with reference to the existing technical engineering;

[0039] The limiting component is installed on the steel pipe 5, and the limiting component and the steel ring tube 2 are limitedly matched.

[0040] The utility model transforms the stable welding connection between the spiral blade 1 and the steel pipe 5 in the prior art into a sliding connection by arranging a plurality of steel balls 8, a plurality of first circular grooves 7 and a plurality of second circular grooves 9; when the external load acts on the combined pile and gradually increases, a relative displacement will occur between the steel pipe 5 and the steel ring tube 2, and the steel balls 8 between the first circular grooves 7 and the second circular grooves 9 will scratch a plurality of vertical marks on the outer wall of the steel pipe 5 or the inner wall of the steel ring tube 2, thereby transferring the load to the lower spiral blade 1 more through the relative sliding between the steel ring tube 2 and the steel pipe 5, thereby reducing the concentration of local stress; at the same time, the process redistributes the stress, realizes the purpose of evenly distributing the load along the entire length of the pile body, greatly alleviates the problem of stress concentration at the connection between the upper spiral blade 1 and the steel pipe 5 in the prior art, and better conforms to the load transfer theory of the rigid cement-soil composite pile;

[0041] In the utility model, when the steel ring tube 2 is displaced upward relative to the steel pipe 5, it can provide better compressive bearing capacity, and when it is displaced downward relatively, it can also provide better tensile bearing capacity, thereby exerting better bearing performance, saving materials and reducing energy consumption.

[0042] A further optimized solution is that 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 two semicircular steel sleeves are detachably connected by bolts or other special fasteners, and in this example, bolts 4 are preferably used to facilitate disassembly and reassembly of the steel ring cylinder.

[0043] Further optimized solution, a plurality of second circular grooves 9 are opened on the inner wall of the semicircular steel sleeve; a plurality of steel balls 8 are respectively abutted between the plurality of first circular grooves 7 and the plurality of second circular grooves 9; a plurality of steel balls 8 are symmetrically pressed into the plurality of second circular grooves 9, and the number and position of the plurality of second circular grooves 9 correspond to the first circular grooves 7;

[0044] When the external load acts on the composite pile and gradually increases, a relative displacement will occur between the steel pipe 5 and the steel ring cylinder 2. The steel ball 8 between the first circular groove 7 and the second circular groove 9 will scratch a number of vertical marks on the outer wall of the steel pipe 5 or the inner wall of the steel ring cylinder 2, and then the load will be transferred more to the lower spiral blade 1 through the relative sliding between the steel ring cylinder 2 and the steel pipe 5, thereby reducing the concentration of local stress.

[0045] According to a further optimization scheme, the steel ball 8 is fixedly connected to the inner wall of the semicircular steel sleeve. In this embodiment, the steel ball 8 is fixed to the inner wall of the semicircular steel sleeve by welding. The welding connection ensures the stability of the steel ball 8, which will not move or fall off easily under external disturbance.

[0046] A plurality of steel balls 8 are arranged in one-to-one correspondence with a plurality of first circular grooves 7; after welding, a cover plate is added to the gap between the steel ring tube 2 and the steel pipe 5 to prevent the entry of debris, reduce the risk of wear and damage caused by debris, and provide a certain degree of sealing.

[0047] According to a further optimization scheme, a plurality of first circular grooves 7 are arranged at equal intervals along the outer wall of the steel pipe 5; the equal interval arrangement enables the steel balls 8 to evenly transfer the load to the steel ring tube 2 when sliding, thereby reducing the concentration of local stress and improving the stability of the entire structure.

[0048] To further optimize the 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 detachably connected by bolts 4; the bolt connection is convenient for installation and disassembly, and can adapt to different working conditions by increasing or reducing the number of bolts 4 or adjusting the preload force of bolts 4.

[0049] Further optimized solution, the limit assembly includes two barrier protrusions 6 fixedly connected to the outer wall of the steel pipe 5, the steel ring tube 2 is arranged between the two barrier protrusions 6, and the steel ring tube 2 and the two barrier protrusions 6 are limitedly matched;

[0050] The distance between the annular barrier protrusion 6 and the first circular groove 7 is 0.3 to 0.7 times the length of the steel ring tube 2; by setting the distance between the annular barrier protrusion 6 and the first circular groove 7, the maximum displacement of the steel ball 8 is limited to prevent the steel ball 8 from scratching the steel ring tube 2 along with the steel pipe 5.

[0051] The assembly sequence of the utility model is as follows: first, a corresponding steel ball 8 is placed at the first circular groove 7 on the outer wall of the steel pipe 5 for the construction structure, and then the second circular groove 9 on the inner wall of the steel ring tube 2 is assembled correspondingly to the steel ball 8. The flange ear plates 3 on both sides are connected by bolts 4 to initially become one, and the steel ring tube 2 is radially pressurized to make the steel ball 8 penetrate into the steel pipe 5 and the steel ring tube 2, so that the inner wall of the steel ring tube 2 is tightly fitted with the outer wall of the steel pipe 5, and finally the bolts 4 and nuts are tightened to fix them.

[0052] The utility model also provides an application method of a stress-controllable spiral steel pipe-cement soil combined bearing structure, comprising the following steps:

[0053] Step 1: Detect underground obstacles in the construction area of ​​the combined load-bearing structure, clear the obstacles, level the site, and compact it layer by layer; eliminate safety hazards, avoid damage to construction equipment and personal injury, ensure the stability and bearing capacity of the construction base, and provide a good foundation for subsequent earth excavation and combined load-bearing structure construction;

[0054] Step 2: Excavate to the designed elevation to ensure the accuracy of subsequent construction and meet the design requirements; measure and position according to the actual construction requirements, accurately determine the construction location and size, and ensure the construction quality; make permanent and temporary signs to provide a clear reference for subsequent construction and facilitate the positioning and operation of construction personnel;

[0055] Step 3: Position the three-axis mixing pile holes to ensure that the position of the mixing piles meets the design requirements and enhance the stability and bearing capacity of the combined bearing structure; put the pile driver in place, prepare and inject cement slurry according to the construction requirements to enhance the strength and stability of the mixing piles and improve the construction quality; control the sinking and lifting speed of the mixing pile driver to ensure the uniformity and integrity of the mixing piles and reduce defects;

[0056] Step 4: Install the steel ring tube 2 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 into the outer core cement soil mixing pile to ensure that the accuracy, stability and height of the combined bearing structure meet the design requirements, which is convenient for subsequent construction and acceptance.

[0057] 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.

[0058] 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. Stress coordinated spiral steel pipe-cement soil composite pile, characterized by: include: A steel pipe (5), wherein the outer wall of the steel pipe (5) is provided with a plurality of first circular grooves (7); Steel balls (8), wherein a plurality of the steel balls (8) are provided; the plurality of the steel balls (8) are respectively arranged in the plurality of the first circular grooves (7); A steel ring cylinder (2), wherein the steel ring cylinder (2) is sleeved on the outer wall of the steel pipe (5), and the steel ring cylinder (2) is slidably connected to the outer wall of the steel pipe (5); the steel ball (8) is abutted between the first circular groove (7) and the inner wall of the steel ring cylinder (2); A spiral blade (1), wherein the spiral blade (1) is mounted on the outer wall of the steel ring cylinder (2); A limit assembly is installed on the steel pipe (5), and the limit assembly and the steel ring tube (2) are in limit cooperation.

2. The stress-coordinated spiral steel pipe-cement soil composite pile according to claim 1 is 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.

3. The stress-coordinated spiral steel pipe-cement soil composite pile according to claim 2 is characterized in that: A plurality of second circular grooves (9) are provided on the inner wall of the semicircular steel sleeve; and a plurality of the steel balls (8) are respectively abutted between a plurality of the first circular grooves (7) and a plurality of the second circular grooves (9).

4. The stress-coordinated spiral steel pipe-cement soil composite pile according to claim 2 is characterized in that: The steel balls (8) are fixedly connected to the inner wall of the semicircular steel sleeve; a plurality of the steel balls (8) are arranged in a one-to-one correspondence with a plurality of the first circular grooves (7).

5. The stress-coordinated spiral steel pipe-cement soil composite pile according to claim 1 is characterized in that: A plurality of the first circular grooves (7) are arranged at equal intervals along the outer wall of the steel pipe (5).

6. The stress-coordinated spiral steel pipe-cement soil composite pile according to claim 2 is 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 detachably connected via bolts (4).

7. The stress-coordinated spiral steel pipe-cement soil composite pile according to claim 1 is 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 the steel ring tube (2) and the two blocking protrusions (6) are in limiting cooperation.

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