A steel pipe concrete mixing composite pile inclined strut structure for foundation pit support

Abstract

The utility model relates to a foundation pit support technical field especially, it is a kind of steel pipe concrete mixing composite pile inclined strut structure for foundation pit support, steel pipe concrete mixing composite inclined strut pile is arranged in the inside of the foundation pit support pile and is inclined, the steel pipe concrete mixing composite inclined strut pile includes steel pipe concrete core pile and pile peristalsis body, wherein the pile peristalsis body is arranged in the foundation pit support pile, its bottom is inserted in the soil layer of foundation pit bottom, the steel pipe concrete core pile is arranged in the pile peristalsis body, the steel pipe concrete core pile includes steel pipe and the fine stone concrete that pours in the steel pipe, the top of steel pipe concrete core pile is connected into whole with the foundation pit support pile by reinforced concrete crown beam, the utility model has the advantages of: inclined pile supporting force is big, inclined pile is easy to pile, construction machine is 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 concrete mixing composite pile inclined bracing 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 horizontal bracing structures, existing technologies employ a combination of support piles and inclined bracing structures for foundation pit support. This approach minimizes the impact on foundation pit excavation and is convenient to construct. However, current inclined bracing structures primarily utilize precast piles. The construction of precast inclined piles is challenging, quality control is difficult, and the relatively small diameter of precast piles limits the supporting force they provide. Summary of the Invention

[0004] The purpose of this utility model is to address the shortcomings of the prior art by providing a steel-concrete composite pile inclined support structure for foundation pit support. The foundation pit support pile is supported by a steel-concrete structure, and the ground friction resistance is obtained by large-diameter cement-soil piles around the pile, which greatly improves the supporting force of the foundation pit inclined support pile. At the same time, the steel-concrete composite pile is constructed by inclined construction with a guide frame, which makes it easy to make inclined piles with good pile quality. The pile foundation equipment is also small and convenient, making it very suitable for constructing steel-concrete composite pile inclined support structures in foundation pits.

[0005] The objective of this utility model is achieved through the following technical solution: A steel-concrete composite pile inclined bracing structure for foundation pit support includes foundation pit support piles. The structure is characterized by: a steel-concrete composite pile inclined bracing is inclinedly arranged on the inner side of the foundation pit support piles. The steel-concrete composite pile inclined bracing includes a steel-concrete core pile and a surrounding mixing body. The surrounding mixing body is located within the foundation pit support piles, with its bottom extending into the soil layer at the bottom of the foundation pit. The steel-concrete core pile is located within the surrounding mixing body. The steel-concrete core pile includes a steel pipe and fine aggregate concrete poured into the steel pipe. The top of the steel-concrete core pile is connected to the foundation pit support pile as 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 spliced ​​by threaded sleeve joints or welding.

[0008] Both the steel-concrete core pile and the pile-surround mixing body are arranged at a certain angle and are concentric.

[0009] The advantages of this utility model are: 1) High support capacity of inclined piles: Steel-concrete composite piles obtain soil friction from large-diameter mixing piles and bear axial force from high-bearing steel-concrete composite core piles. Their bearing capacity is significantly higher than that of the commonly used small-diameter precast inclined piles in foundation pits. At the same time, the inclination of the inclined piles can be made relatively large, which can provide strong horizontal support for foundation pit support piles.

[0010] 2) Easy to form inclined piles: The piles are formed by mixing with an inclined guide frame, which is simple, convenient and efficient. The piles will not collapse and the quality of the piles 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 ; Figure 6 This is a schematic diagram of the construction steps of this utility model. Figure V . 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 1-6As 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 concrete mixing composite inclined support pile 10, reinforced concrete cap beam 11, radial blade or rib 12, fine stone concrete 13.

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

[0017] Combination Figures 1 to 6 As shown, the support structure in this embodiment mainly includes foundation pit support piles 8, steel-concrete composite inclined bracing piles 10, and reinforced concrete capping beams 11. The steel-concrete composite inclined bracing piles 10 include a steel-concrete core pile and a surrounding mixing body 9. The surrounding mixing body 9 is located inside the foundation pit support piles 8, and the steel-concrete core pile is located within the surrounding mixing body 9. The steel-concrete core pile includes a steel pipe 4 and fine aggregate concrete 13 poured inside it. The top of the steel-concrete core pile is located within the reinforced concrete capping beam 11 located on the ground surface, and the reinforced concrete capping beam 11 forms an integral structure with the foundation pit support piles 8. The bottom of the steel-concrete composite inclined pile 10 extends into the soil layer at the bottom of the foundation pit. It obtains soil friction force from the large-diameter mixing pile and bears axial force from the high-bearing steel-concrete composite core pile. Its bearing capacity is significantly improved compared with the commonly used small-diameter precast inclined piles in foundation pits. At the same time, the inclination of the inclined pile can be made relatively large, which can provide strong horizontal support force for the foundation pit support pile 8.

[0018] Combination Figures 2 to 6 As shown, the steel-concrete composite pile inclined bracing structure for foundation pit support in this embodiment includes the following construction methods. All construction equipment involved in these methods utilizes existing technology and is not a novel construction equipment specifically designed for this embodiment. 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-concrete composite inclined pile 10 to be constructed later. In this embodiment, the entire construction equipment is located on the soil layer outside the excavation area of ​​the foundation pit to construct the steel-concrete composite inclined pile 10 from outside the pit to inside. The inclined frame 7 adopts a guide frame structure to adjust the pile angle at the foundation position.

[0019] 2) such as Figure 3As 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, fine stone concrete 13 is poured into the hollow steel pipe 4 to form a steel pipe concrete core pile, which is then combined with the pile surrounding mixing body 9 to form a steel pipe concrete mixing composite inclined support pile 10.

[0022] 5) such as Figure 6 As shown, the top of the steel pipe 4 and the foundation pit support pile 8 are cast together with a reinforced concrete cap beam 11 to form a foundation pit support pile 8 + inclined brace foundation pit support system. Then the construction equipment is removed and the foundation pit is excavated.

[0023] 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 concrete core pile and the pile mixing body 9.

[0024] 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-concrete composite pile bracing structure for foundation pit support, comprising foundation pit support piles, characterized in that: A steel-concrete composite inclined support pile is inclinedly installed on the inner side of the foundation pit support pile. The steel-concrete composite inclined support pile includes a steel-concrete core pile and a pile-peripheral mixing body. The pile-peripheral mixing body is located inside the foundation pit support pile, and its bottom extends into the soil layer at the bottom of the foundation pit. The steel-concrete core pile is located in the pile-peripheral mixing body. The steel-concrete core pile includes a steel pipe and fine stone concrete poured inside the steel pipe. The top of the steel-concrete core pile is connected to the foundation pit support pile as a whole by a reinforced concrete cap beam.

2. The inclined bracing structure of steel-concrete composite piles 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 inclined bracing structure of steel-concrete composite piles for foundation pit support according to claim 1, characterized in that: The steel pipe adopts a splicing structure, which is connected and spliced ​​by threaded sleeve joints or welding.

4. The inclined bracing structure of steel-concrete composite piles for foundation pit support according to claim 1, characterized in that: Both the steel-concrete core pile and the pile-surround mixing body are arranged at a certain angle and are concentric.

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