Steel pipe mixing composite pile cable-stayed structure for foundation pit support

Abstract

The utility model relates to a foundation pit support technical field especially is a kind of steel pipe stirring composite pile cable-stayed structure for foundation pit support, steel pipe stirring composite cable-stayed pile is inclinedly arranged on the outside of the foundation pit support pile, the steel pipe stirring composite cable-stayed pile includes steel pipe and pile peristaltic stirring body, wherein the pile peristaltic stirring body is arranged in the soil layer outside the foundation pit support pile, the steel pipe is arranged in the pile peristaltic stirring body, the top of the steel pipe is exposed above ground, and the pile top of the foundation pit support pile is connected into a whole with the part of steel pipe exposed from ground by reinforced concrete crown beam.The utility model has the advantages of: large cable-stayed pile pulling force, inclined pile piling easily, construction machine small, micro-disturbance, no pollution, vibration, noise is small.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support technology, and in particular to a steel pipe mixing composite pile inclined structure for foundation pit support. Background Technology

[0002] Currently, horizontal bracing structures are commonly used for foundation pit support. However, for large-area foundation pits, the use of horizontal bracing structures presents challenges such as complexity, long construction period, and high investment. Furthermore, horizontal bracing structures pose significant difficulties for earthwork excavation and main structure construction, and are difficult to dismantle and costly.

[0003] To address the problems associated with cross-bracing structures, existing technologies employ a combination of retaining piles and cable-stayed structures for foundation pit support. This approach minimizes the impact on excavation and is convenient to construct. However, current cable-stayed structures primarily utilize anchor rods and cables, which have small diameters, resulting in low anchoring force. This often necessitates long anchoring sections and imposes stringent requirements on the available land area. Summary of the Invention

[0004] The purpose of this utility model is to address the shortcomings of the existing technology by providing a steel pipe mixing composite pile inclined structure for foundation pit support. This structure consists of a steel pipe core pile and a surrounding mixing body. The steel pipe bears the horizontal force of the support pile, while the large-diameter cement-soil piles around the pile provide the ground friction resistance, significantly improving the tensile strength of the foundation pit inclined pile. Furthermore, the steel pipe mixing composite pile is constructed using a guide frame with an inclined construction method, making it easy to create inclined piles with good pile quality. The pile foundation equipment is also compact and convenient, making it highly suitable for constructing large-diameter steel pipe mixing composite pile inclined structures in foundation pit engineering.

[0005] The objective of this utility model is achieved through the following technical solution: A steel pipe mixing composite pile inclined structure for foundation pit support includes foundation pit support piles, characterized in that: a steel pipe mixing composite inclined pile is inclinedly arranged on the outside of the foundation pit support piles, the steel pipe mixing composite inclined pile includes a steel pipe and a pile-peripheral mixing body, wherein the pile-peripheral mixing body is located in the soil layer outside the foundation pit support piles, the steel pipe is located in the pile-peripheral mixing body, the top of the steel pipe is exposed above the ground, and the top of the foundation pit support pile is connected to the exposed part of the steel pipe to form a whole by a reinforced concrete cap beam.

[0006] The outer wall of the steel pipe is provided with radial blades or ribs, and the radial blades or ribs are embedded in the pile periphery mixing body.

[0007] The steel pipe adopts a splicing structure, which is connected and extended by threaded sleeve joints or welding.

[0008] Both the steel pipe and the pile-peripheral mixing body are arranged at a certain angle and are concentric.

[0009] The advantages of this utility model are: 1) High tensile force of inclined cable piles: The steel pipe mixing composite inclined cable pile obtains soil friction force from the large-diameter mixing pile, and the axial tensile force is borne by the high-tensile steel pipe core pile. Its outer diameter is much larger than that of commonly used anchor rods and anchor cables, and the tensile force obtained is also much greater, which can effectively reduce the length of the anchorage section.

[0010] 2) Easy to form inclined piles: The inclined guide frame is used to mix the piles, which makes the construction simple, convenient and efficient, and the pile quality is good.

[0011] 3) Compact construction equipment: Due to the use of steel pipes to form piles section by section, each section of steel pipe can be adjusted according to the space of the foundation pit structure, resulting in compact equipment with strong applicability.

[0012] 4) Minimal disturbance: This pile type adopts the mixing and sinking pile forming process, which will not cause the hole to collapse or the soil squeezing effect, and has minimal disturbance to the surrounding environment.

[0013] 5) No pollution, low vibration and noise: This type of pile will not generate waste such as mud during construction, and the vibration and noise during construction are also very low, which is environmentally friendly. Construction in urban areas will have little impact on the surrounding environment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the construction steps of this utility model. Figure I ; Figure 3 This is a schematic diagram of the construction steps of this utility model. Figure II ; Figure 4 This is a schematic diagram of the construction steps of this utility model. Figure III ; Figure 5 This is a schematic diagram of the construction steps of this utility model. Figure IV . Detailed Implementation

[0015] The features of this utility model and other related features will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art: like Figure 1-5 As shown in the figure, each of the markings represents: cement slurry pump 1, grouting hose 2, mixing head 3, steel pipe 4, grouting steel pipe 5, rotary power head 6, inclined frame 7, foundation pit support pile 8, pile perimeter mixing body 9, steel pipe mixing composite inclined tie pile 10, reinforced concrete cap beam 11, radial blade or rib 12.

[0016] Example: Figure 1As shown in this embodiment, the steel pipe mixing composite pile inclined structure for foundation pit support can be widely used in various foundation pit projects, especially large-area foundation pits, and has great economic and technical value and broad application prospects.

[0017] Combination Figures 1 to 5 As shown, the support structure in this embodiment mainly includes foundation pit support piles 8, steel pipe mixing composite inclined tie piles 10, and reinforced concrete capping beams 11. The steel pipe mixing composite inclined tie piles 10 include steel pipes 4 and a pile-peripheral mixing body 9. The pile-peripheral mixing body 9 is located in the soil outside the foundation pit support piles 8, and the steel pipes 4 are located within the pile-peripheral mixing body 9. The top of the steel pipes 4 is located in the reinforced concrete capping beam 11 located on the ground surface, forming an integral structure with the foundation pit support piles 8 through the reinforced concrete capping beam 11. The steel pipe mixing composite inclined tie piles 10 obtain soil friction from large-diameter mixing piles, and bear axial tension from high-tensile steel pipe core piles. Their outer diameter is much larger than that of commonly used anchor bolts and anchor cable holes, resulting in a much greater tensile force, which can effectively reduce the anchorage section length.

[0018] Combination Figures 2 to 5 As shown, the construction of the steel pipe mixing composite pile inclined structure for foundation pit support in this embodiment includes the following construction methods. All construction equipment involved in the construction methods are existing equipment in the prior art and are not new construction equipment specially designed for this embodiment. The details are as follows: 1) such as Figure 2 As shown, the construction equipment includes a rotary power head 6, which is mounted on an inclined frame 7. The inclination angle of the inclined frame 7 is the design inclination angle for the steel pipe mixing composite inclined pile 10 to be constructed later. In this embodiment, the entire construction equipment is located above the soil layer of the foundation pit to be excavated, so as to construct the steel pipe mixing composite inclined pile 10 from inside the pit to outside the pit. The inclined frame 7 adopts a guide frame structure to adjust the pile foundation angle at the foundation position.

[0019] 2) such as Figure 3 As shown, the rotary power head 6 can rotate under power drive. The rotary power head 6 holds the steel pipe 4 and rotates it, which drives the mixing head 3 set at the bottom of the steel pipe 4 to rotate and cut the soil. At the same time, the cement slurry pump 1 sprays cement slurry into the mixing head 3 through the grouting hose 2 and the grouting steel pipe 5. The soil at the pile head is fully mixed with the cement slurry under the mixing of the mixing head 3 to form the pile perimeter mixing body 9. At the same time, the tilting frame 7 drives the steel pipe 4 and the mixing head 3 to sink in the soil while being mixed. If remixing is required, the tilting frame 7 can also drive the steel pipe 4 and the mixing head 3 to stir up and down repeatedly to complete the remixing.

[0020] 3) such as Figure 4 As shown, after the construction of one section of the pile perimeter mixing body 9 is completed, the next section of steel pipe and the grouting steel pipe 5 inside the steel pipe are connected by threaded sleeve joint or welding, and the second step is repeated to complete the mixing construction section by section until the designed pile length is reached.

[0021] 4) such as Figure 5 As shown, the top of the steel pipe 4 and the support pile are cast together with a reinforced concrete cap beam 11 to form a foundation pit support pile 8 + inclined foundation pit support system. Then the construction equipment is removed and the foundation pit is excavated.

[0022] In the specific implementation of this embodiment: as follows Figure 1 As shown, radial blades or ribs 12 are provided on the outer wall of the steel pipe 4. Several radially arranged blades or ribs are evenly spaced along the length of the steel pipe 4 and embedded in the pile mixing body 9 to increase the connection performance between the steel pipe 4 and the pile mixing body 9.

[0023] Although the above embodiments have been described in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A steel pipe mixing composite pile cable-stayed structure for foundation pit support, comprising a foundation pit support pile, characterized in that: A steel pipe mixing composite inclined tie pile is inclinedly installed on the outside of the foundation pit support pile. The steel pipe mixing composite inclined tie pile includes a steel pipe and a pile-peripheral mixing body. The pile-peripheral mixing body is located in the soil layer outside the foundation pit support pile. The steel pipe is located in the pile-peripheral mixing body. The top of the steel pipe is exposed above the ground. The top of the foundation pit support pile is connected to the part of the steel pipe exposed above the ground by a reinforced concrete cap beam to form an integral whole.

2. The steel pipe mixing composite pile cable-stayed structure for foundation pit support according to claim 1, characterized in that: The outer wall of the steel pipe is provided with radial blades or ribs, and the radial blades or ribs are embedded in the pile periphery mixing body.

3. The steel pipe mixing composite pile cable-stayed structure for foundation pit support according to claim 1, characterized in that: The steel pipe adopts a splicing structure, which is connected and extended by threaded sleeve joints or welding.

4. The steel pipe mixing composite pile cable-stayed structure for foundation pit support according to claim 1, characterized in that: Both the steel pipe and the pile-peripheral mixing body are arranged at a certain angle and are concentric.

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