Anti-sliding structure of inclined steel pipe composite piles to improve the stability of soft soil embankments and dams.

Abstract

This utility model relates to the field of earthwork technology, specifically to an anti-sliding structure of inclined steel pipe composite piles for improving the stability of soft soil embankments and dikes. It includes isolation piles and inclined support piles installed at the toe of the slope in the earthwork fill structure. The isolation piles are located near the toe, and the inclined support piles are located outside the isolation piles with a certain distance between them. The inclined support piles and the isolation piles are connected to form an integral structure. Both the isolation piles and the inclined support piles are steel pipe composite piles, which include steel pipe concrete core piles and cement-soil mixing piles. The steel pipe concrete core piles are located within the cement-soil mixing piles. The advantages of this utility model are: it forms a combined support system of piles and inclined supports, supporting the sliding force of the fill slope on soft soil, thereby significantly improving the stability of soft soil embankments.

Description

Technical Field

[0001] This utility model relates to the field of earthwork technology, specifically to an anti-sliding structure of inclined steel pipe composite piles for improving the stability of soft soil embankments and dams. Background Technology

[0002] Currently, methods to improve the stability of soft soil embankments and dams include drainage consolidation, composite foundation reinforcement, and rigid pile reinforcement. Drainage consolidation offers limited improvement in embankment and dam stability, composite foundations have weak shear resistance, and rigid piles are too expensive. Furthermore, current foundation treatments and lateral restraint piles are all vertical pile foundations, which have limited resistance to horizontal loads. When constructing earth-rock embankments, riverbanks, and seawalls on soft soil foundations such as silt and silty clay, there may be stability issues with the fill slopes. Fill projects on soft soil foundations are prone to instability and cannot be completed. Summary of the Invention

[0003] The purpose of this utility model is to address the shortcomings of the prior art by providing an anti-slip structure for inclined steel pipe composite piles that improves the stability of soft soil embankments and dams. By forming an inclined pile anti-slip structure with inclined piles and vertical piles composed of steel pipe composite piles, the anti-slip capacity of the slope toe restraint piles is greatly improved, thereby significantly enhancing the stability of soft soil embankments and dams.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A type of inclined steel pipe composite pile anti-sliding structure for improving the stability of soft soil embankments and dams, used for anti-sliding of earthwork filling structures, is characterized by: including isolation piles and inclined support piles set at the toe of the earthwork filling structure; the isolation piles are set on the side adjacent to the toe of the slope, and the inclined support piles are set on the outside of the isolation piles with a certain distance between them; the inclined support piles and the isolation piles are connected to form an integral structure; both the isolation piles and the inclined support piles are steel pipe composite piles, and the steel pipe composite piles include steel pipe concrete core piles and cement-soil mixing piles, with the steel pipe concrete core piles set in the cement-soil mixing piles.

[0006] The tops of the isolation piles and the inclined support piles are connected by a reinforced concrete cap beam to form an integral structure.

[0007] The isolation piles and the inclined support piles are each equipped with a connecting steel cage that is connected to the reinforced concrete cap beam.

[0008] The cement-soil mixing piles that serve as the isolation piles interlock with the adjacent steel pipe composite piles.

[0009] The bottoms of both the isolation piles and the inclined support piles are located in the bearing layer beneath the earthwork fill structure.

[0010] The advantages of this utility model are:

[0011] 1) Steel pipe composite piles do not require the excavation of pile holes, and there is no impact from hole collapse or mud slurry, so the impact on landslides is small.

[0012] 2) Steel pipe composite pile construction machinery is compact, allowing for rapid and convenient construction;

[0013] 3) Steel pipe composite piles can be easily used for inclined pile construction;

[0014] 4) The outer wall of the steel pipe composite pile is rough with cement soil, which can obtain greater friction in soft soil. The core pile has strong bearing capacity and can provide great support in soft soil.

[0015] 5) The reinforced concrete capping beam cast on the pile is rigidly connected to the steel pipe composite pile, forming an anti-sliding system of pile row and inclined support, which has a strong ability to resist landslide thrust. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the arrangement structure of this utility model;

[0017] Figure 2 This is a plan view of the present invention;

[0018] Figure 3 Construction steps of this utility model Figure I ;

[0019] Figure 4 Construction steps of this utility model Figure II ;

[0020] Figure 5 Construction steps of this utility model Figure III ;

[0021] Figure 6 Construction steps of this utility model Figure IV . Detailed Implementation

[0022] 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:

[0023] like Figure 1-5 As shown in the figure, numbers 1-17 represent: 1. Earth and rock fill structure, 2. Soft soil layer, 3. Bearing layer, 4. Most dangerous slip zone, 5. Isolation pile, 6. Inclined support pile, 7. Reinforced concrete cap beam, 8. Steel pipe concrete core pile, 9. Cement-soil mixing pile, 10. Cement grout pump, 11. Grouting hose, 12. Mixing head, 13. Steel pipe, 14. Grouting steel pipe, 15. Rotary power head, 16. Frame, 17. Connecting steel cage.

[0024] Example: Figure 1 As shown, in this embodiment, the inclined-braced steel pipe composite pile anti-sliding structure for improving the stability of soft soil embankments and dams is used for anti-sliding of earth-rock fill structure 1, especially to avoid landslides at the most dangerous slip arc area 4, thereby improving the stability of soft soil embankments and dams. The earth-rock fill structure 1 is constructed on top of the soft soil layer 2, and the bearing layer 3 is located below the soft soil layer 2.

[0025] Combination Figure 1 and Figure 2 As shown, the anti-sliding structure in this embodiment includes isolation piles 5 and inclined support piles 6 set at the toe of the slope of the earth-rock fill structure 1. The isolation piles 5 are set on the side adjacent to the toe of the slope, and the inclined support piles 6 are set on the outside of the isolation piles 5 with a certain distance between them.

[0026] Both the isolation pile 5 and the inclined support pile 6 are steel pipe composite piles, which include a steel pipe concrete core pile 8 and a cement-soil mixing pile 9. The steel pipe concrete core pile 8 is set within the cement-soil mixing pile 9. The steel pipe composite pile itself has strong shear resistance, the steel pipe concrete core pile 8 has a strong ability to withstand axial loads, and the cement-soil mixing pile 9 set around the steel pipe concrete core pile 8 has a strong ability to obtain friction from the soft soil layer 2. The combination of the isolation pile 5 and the inclined support pile 6 forms an anti-sliding structure, which greatly improves the anti-sliding capacity of the slope toe restraint piles, thereby significantly improving the stability of soft soil embankments and dams.

[0027] In this embodiment, the isolation pile 5 is a pile row structure, which is composed of several vertically arranged steel pipe composite piles. The cement-soil mixing piles 9 of each steel pipe composite pile serving as the isolation pile 5 interlock with each other. The inclined support pile 6 includes several steel pipe composite piles arranged at intervals. The top of each steel pipe composite pile serving as the inclined support pile 6 is connected and fixed to the isolation pile 5 through a reinforced concrete cap beam 7 to form an integral structure.

[0028] like Figures 3 to 6 As shown, this embodiment can be constructed using the existing guide frame mixing hole-forming process, but it is not limited to this construction process. That is, the isolation pile 5 and the inclined support pile 6 can be constructed using any existing construction process that meets the process requirements.

[0029] This embodiment may include the following construction methods:

[0030] 1) such as Figure 3As shown, the construction equipment includes a cement slurry pump 10, a grouting hose 11, a mixing head 12, a grouting steel pipe 14, a rotary power head 15, and a frame 16. The rotary power head 15 is mounted on the frame 16 and is rotatable and can be raised and lowered along the height of the frame 16. Its specific mechanism can employ existing technology, for example, including a rotary drive device and a lifting drive device. The steel pipe 13 can be clamped by the rotary power head 15 and rotated under its drive. The cement slurry pump 10 is connected to the grouting steel pipe 14 via the grouting hose 11. The grouting steel pipe 14 is used to spray cement slurry outwards when the steel pipe 13 sinks.

[0031] During construction, the rotary power head 15 grips and rotates the steel pipe 13, driving the mixing head 12, located at the bottom of the steel pipe 13, to rotate. This mixing head 12 is used to cut the soil. Simultaneously, the cement slurry pump 10 injects cement slurry into the mixing head 12 through the grouting hose 11 and the grouting steel pipe 14. The soil at the pile head is fully mixed with the cement slurry under the mixing of the mixing head 12, forming a cement-soil mixing pile 9. At the same time, the frame 16, through the rotary power head 15, drives the steel pipe 13 and the mixing head 12 to sink into the soil while mixing. If remixing is required, the frame 16 can also drive the steel pipe 13 and the mixing head 12 to move up and down repeatedly to complete the remixing. After completion, the steel pipe of the interlocking pile 5 and the surrounding cement-soil mixing pile portion are constructed.

[0032] 2) such as Figure 4 As shown, the frame 16 has a guide shaft, which can change the sinking angle of the steel pipe 13. According to the design angle requirements, the steel pipe of the inclined support pile 6 and the cement-soil mixing pile part around it are constructed in step 1).

[0033] 3) such as Figure 5 As shown, concrete is poured into the two rows of steel pipe piles to complete the main construction of the isolation pile 5 and the inclined support pile 6. At the same time, a connecting steel cage 17 is installed on the top of the piles.

[0034] 4) such as Figure 6 As shown, a reinforced concrete capping beam 7 is poured on top of the isolation piles 5 and the inclined support piles 6, thereby connecting and fixing the isolation piles 5 and the inclined support piles 6 to form an integral structure. In this embodiment, the steel bars inside the reinforced concrete capping beam 7 are connected to the connecting steel cages 17 of both the isolation piles 5 and the inclined support piles 6, thereby improving the connection performance between the isolation piles 5, the inclined support piles 6 and the reinforced concrete capping beam 7.

[0035] Although the above embodiments have described the concept and embodiments of the present invention 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 type of inclined-braced steel pipe composite pile anti-sliding structure for improving the stability of soft soil embankments and dams, used for anti-sliding of earthwork filling structures, characterized in that: The structure includes isolation piles and inclined support piles installed at the toe of the slope in the earth-rock fill structure. The isolation piles are located on the side adjacent to the toe of the slope, and the inclined support piles are located outside the isolation piles with a certain distance between them. The inclined support piles and the isolation piles are connected to form an integral structure. Both the isolation piles and the inclined support piles are steel pipe composite piles, which include steel pipe concrete core piles and cement-soil mixing piles. The steel pipe concrete core piles are installed within the cement-soil mixing piles.

2. The anti-sliding structure of inclined steel pipe composite piles for improving the stability of soft soil embankments and dams according to claim 1, characterized in that: The tops of the isolation piles and the inclined support piles are connected by a reinforced concrete cap beam to form an integral structure.

3. The anti-sliding structure of inclined steel pipe composite piles for improving the stability of soft soil embankments and dams according to claim 2, characterized in that: The isolation piles and the inclined support piles are each equipped with a connecting steel cage that is connected to the reinforced concrete cap beam.

4. The anti-sliding structure of inclined steel pipe composite piles for improving the stability of soft soil embankments and dams according to claim 1, characterized in that: The cement-soil mixing piles that serve as the isolation piles interlock with the adjacent steel pipe composite piles.

5. The anti-sliding structure of inclined steel pipe composite piles for improving the stability of soft soil embankments and dams according to claim 1, characterized in that: The bottoms of both the isolation piles and the inclined support piles are located in the bearing layer beneath the earthwork fill structure.

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