Ribbed concrete-filled steel tube mixing composite pile

Abstract

The utility model relates to the technical field of pile foundation engineering, in particular to a ribbed concrete-filled steel tube mixing composite pile which comprises a cement mixing pile and a steel tube in the cement mixing pile, concrete is poured in the steel tube, ribs are evenly arranged on the periphery of the steel tube, and the ribs are evenly arranged at intervals in the length direction of the steel tube. The utility model has the advantages that: 1) due to the existence of the ribs outside the steel pipe, the friction force between the wall of the steel pipe and cement soil is greatly improved, and the bearing capacity and the pulling resistance of the composite pile are effectively improved; (2) the synchronous stirring sinking process of the steel pipe and the stirring pile is adopted, so that the attachment of the cement soil and the ribbed steel pipe wall is effectively ensured, and the friction force of the composite pile is effectively improved;

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundation engineering, in particular to a ribbed steel tube concrete mixing composite pile. Background Art

[0002] Currently used rigid-flexible composite piles typically have a smooth interface between the rigid core pile and the cement soil, such as in precast pipe piles, small square piles, and steel pipe piles. When geological conditions are favorable and the outer and inner diameters are relatively large, friction between the rigid core pile and the cement soil often becomes the controlling factor in the composite pile's bearing capacity. Deflection or voids between the rigid core pile and the cement soil can easily occur, resulting in an inability to effectively provide bearing capacity. Summary of the Invention

[0003] The purpose of the utility model is to provide a ribbed steel tube concrete mixing composite pile based on the above-mentioned deficiencies of the existing technology. Ribs are added to the outer wall of the steel tube in the steel tube concrete mixing composite pile so that ribs with a certain spacing are formed on the outside of the steel tube, thereby greatly improving the friction between the steel tube wall and the cement soil.

[0004] The purpose of this utility model is achieved by the following technical solutions:

[0005] A ribbed steel tube concrete mixing composite pile, characterized in that it comprises a cement soil mixing pile and a steel tube inside the pile, wherein concrete is poured inside the steel tube, ribs are evenly arranged on the periphery of the steel tube, and the ribs are evenly spaced along the length direction of the steel tube.

[0006] The ribs are circumferential steel bars arranged on the outer wall of the steel pipe.

[0007] The ribs are spiral blades arranged on the outer wall of the steel pipe.

[0008] The ribs are butterfly-shaped blades arranged on the outer wall of the steel pipe.

[0009] The ribs are square ribs arranged on the outer wall of the steel pipe.

[0010] The ribs are strip-shaped blades arranged on the outer wall of the steel pipe.

[0011] The ribs are symmetrically arranged along the circumference of the steel pipe.

[0012] The advantages of the utility model are:

[0013] 1) Due to the presence of the outer ribs of the steel pipe, the friction between the steel pipe wall and the cement soil is greatly increased, effectively improving the bearing capacity and pull-out resistance of the composite pile;

[0014] 2) The synchronous mixing and sinking process of steel pipes and mixing piles is adopted to effectively ensure the fit between cement soil and the ribbed steel pipe wall, and effectively improve the friction of the composite pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 This is a diagram of the first embodiment provided by the present utility model;

[0017] Figure 3 A second embodiment of the present invention is provided;

[0018] Figure 4 A third embodiment of the present invention is provided;

[0019] Figure 5 A fourth embodiment of the present invention is provided.

[0020] Figure 6 This is a diagram of the fifth embodiment provided by the present utility model. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

[0022] like Figure 1-6 As shown, the marks 1-9 in the figure respectively represent: cement soil mixing pile 1, steel pipe 2, rib 3, concrete 4, annular steel bar 5, spiral blade 6, butterfly blade 7, square rib 8, and strip blade 9.

[0023] Example: Figure 1 As shown, the ribbed steel tube concrete mixing composite pile in this embodiment includes a cement-soil mixing pile 1 and a steel tube 2, wherein the steel tube 2 is disposed inside the cement-soil mixing pile 1 and is poured with concrete 4. In some cases, a gel material such as fine stone concrete, mortar, or cement slurry is poured in addition to the concrete 4 to form a composite pile body.

[0024] In this embodiment, ribs are added to the outer wall of the steel tube 2 in the steel tube concrete mixing composite pile. During the production process of the steel tube 2, the ribs 3 can be directly die-cast on the outer wall of the steel tube 2, or small components can be welded to the existing steel tube 2 to form the ribs 3, so that ribs 3 with a certain distance are formed on the outside of the steel tube 2, thereby greatly improving the friction between the outer wall of the steel tube 2 and the cement soil mixing pile 1.

[0025] like Figures 2 to 6 As shown, the ribs 3 may include the following forms:

[0026] 1) If Figure 2As shown, annular steel bars 5 are provided on the outer wall of the steel pipe 2 as ribs 3. The annular steel bars 5 are arranged around the entire circumference of the steel pipe 2. A plurality of annular steel bars 5 are evenly spaced along the length of the steel pipe 2 on its outer wall to increase the friction between the steel pipe 2 and the cement-soil mixing pile 1.

[0027] 2) If Figure 3 As shown, spiral blades 6 are provided on the outer wall of the steel pipe 2 as ribs 3 . The spiral blades 6 are arranged in a continuous spiral on the outer wall of the steel pipe 2 and extend along the steel pipe 2 .

[0028] 3) If Figure 4 As shown, butterfly-shaped blades 7 are provided on the outer wall of the steel pipe 2 as ribs 3 .

[0029] 4) If Figure 5 As shown, square ribs 8 are provided on the outer wall of the steel pipe 2 as ribs 3 .

[0030] 5) If Figure 6 As shown, strip-shaped blades 9 are provided on the outer wall of the steel pipe 2 as ribs 3 .

[0031] During construction, this embodiment includes the following construction steps:

[0032] 1) The rotary power head holds the ribbed steel pipe 2 and rotates, driving the bottom mixing head to rotate. The mixing head cuts the soil. At the same time, the cement slurry pump sprays cement slurry to the mixing head through the grouting hose and grouting steel pipe. The pile head soil is fully mixed with the cement slurry under the stirring of the mixing head to form a large cement-soil pile. At the same time, the frame drives the steel pipe 2 and the mixing head to sink while stirring in the soil. If re-mixing is required, the frame can also drive the steel pipe and the mixing head to stir up and down to complete the re-mixing.

[0033] 2) After the construction of one section of mixing pile is completed, the next section of ribbed steel pipe and the grouting steel pipe inside the steel pipe are connected by threading or welding, and the second step is repeated to complete the mixing pile construction section by section to the designed pile length. After the construction of the mixing pile is completed, the top of the pile is expanded to set the pile head, and concrete is poured into the hollow steel pipe to form a steel tube concrete mixing composite pile.

[0034] 3) Pour cementitious materials such as concrete, mortar or cement slurry into the steel pipe to form a ribbed steel tube concrete mixing pile structure.

[0035] Although the above embodiments have described the concepts and embodiments of the present invention in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, so they are not described here one by one.

Claims

1. A ribbed steel tube concrete mixing composite pile, characterized by: The utility model comprises a cement-soil mixing pile and a steel pipe inside the pile. Concrete is poured inside the steel pipe. Ribs are evenly arranged on the periphery of the steel pipe. The ribs are evenly spaced along the length direction of the steel pipe.

2. The ribbed steel tube concrete mixing composite pile according to claim 1, characterized in that: The ribs are circumferential steel bars arranged on the outer wall of the steel pipe.

3. The ribbed steel tube concrete mixing composite pile according to claim 1, characterized in that: The ribs are spiral blades arranged on the outer wall of the steel pipe.

4. The ribbed steel tube concrete mixing composite pile according to claim 1, characterized in that: The ribs are butterfly-shaped blades arranged on the outer wall of the steel pipe.

5. The ribbed steel tube concrete mixing composite pile according to claim 1, characterized in that: The ribs are square ribs arranged on the outer wall of the steel pipe.

6. The ribbed steel tube concrete mixing composite pile according to claim 1, characterized in that: The ribs are strip-shaped blades arranged on the outer wall of the steel pipe.

7. The ribbed steel tube concrete mixing composite pile according to claim 1, characterized in that: The ribs are symmetrically arranged along the circumference of the steel pipe.

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