Sand-gravel pile construction device capable of achieving rapid discharging
By designing a rapid-discharge sand and gravel pile construction device, utilizing the combination of steel pipes and hinged pile tips for sinking and pulling, and combining it with the use of PVC grouting pipes, the problems of pile slippage and verticality in cement-soil pile construction in the Sabaha soil layer were solved, achieving rapid formation of sand and gravel piles and improvement of soil layer strength.
Patent Information
- Application Number
- CN202520460708.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-17
AI Technical Summary
In the soft Sabar soil layer of the Sabar coastal region of the Middle East, cement-soil pile construction is prone to pile slippage and loss of verticality control, resulting in low bearing capacity and difficulty in forming effective gravel piles to improve soil strength.
A rapid discharge sand and gravel pile construction device is adopted, including a steel pipe, a vibratory hammer, an outer casing, an inner limiting block, and a valve-shaped pile tip. The outer casing and the valve-shaped pile tip sink or rise by sinking and pulling the steel pipe to form a sand and gravel pile. A PVC grouting pipe is installed in the steel pipe for post-grouting or injection of microbial rock-forming agent to form a drainage channel to improve the soil strength.
In the Sabaha soil layer, sand and gravel piles are formed, which increases the sand content, enhances the strength of cement-soil piles, reduces the water content, forms a network of drainage channels, improves the compaction, drainage and consolidation effect of the soil layer, and increases the strength by 0.06 MPa/1% sand content.
Smart Images
Figure CN223867211U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a gravel pile construction device. Background Technology
[0002] The geological conditions in the coastal area of the Sabahar region in the Middle East are extremely complex. The upper 4-15m of this area is a weak Sabkha soil layer. This soil layer has high water content (water content > 60%), high salt content, high compressibility, and low bearing capacity, making it easy for piles to slip and verticality to be lost during cement-soil pile construction. Utility Model Content
[0003] The purpose of this invention is to provide a rapid discharge sand and gravel pile construction device that effectively increases the sand content of the Sabkha soil layer and improves the strength of cement-soil piles.
[0004] The technical solution of this utility model is:
[0005] A rapid discharge gravel pile construction device, characterized by: a steel pipe, a vibratory hammer at the upper end of the steel pipe, an outer sleeve at the lower part of the steel pipe, an inner limiting block at the bottom of the steel pipe, an upper limiting block at the upper end of the outer sleeve that cooperates with the inner limiting block, and a lower limiting block at the lower part of the outer sleeve that cooperates with the inner limiting block; the lower end of the outer sleeve is connected to the valve pile tip via a movable connecting pin; the diameter of the steel pipe is 219mm-800mm; the upper part of the steel pipe has an inlet for backfilling sand or gravel; the distance between the upper and lower limiting blocks is 500-700mm; when the steel pipe sinks, the inner limiting block at the bottom of the steel pipe cooperates with the lower limiting block on the outer sleeve, causing the outer sleeve and the valve pile tip to sink together, at which time the valve is in a closed state; when the steel pipe is pulled up, the inner limiting block at the bottom of the steel pipe cooperates with the upper limiting block on the outer sleeve, causing the outer sleeve and the valve pile tip to move upward together, at which time the valve pile tip opens under the action of gravity.
[0006] The feed inlet is 0.2-5m below the upper end of the steel pipe. A PVC grouting pipe for post-grouting or injection of microbial lithifying agents is installed in the steel pipe.
[0007] This invention enables the formation of gravel piles within Sabagh soil layers. These piles act as compaction and drainage consolidation agents, effectively increasing the sand content of the Sabagh soil and enhancing the strength of the cement-soil piles. In Sabagh soil cement-soil layers, a 1% increase in sand content leads to a 0.06 MPa increase in strength. The formed gravel piles act as drainage channels and hollow channels created by the mixing shaft within the cement-soil mixture. High-pressure gas splitting further forms a mesh-like drainage and ventilation channel, rapidly reducing the water content in weak soil layers. Attached Figure Description
[0008] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0009] Figure 1 This is a structural schematic diagram of one embodiment of the present invention. Detailed Implementation
[0010] A rapid-discharge gravel pile construction device includes a steel pipe 1, a vibratory hammer 2 at the upper end of the steel pipe, an outer sleeve 3 fitted at the lower part of the steel pipe, an inner limiting block 4 at the bottom of the steel pipe, an upper limiting block 5 at the upper end of the outer sleeve that cooperates with the inner limiting block, and a lower limiting block 6 at the lower part of the outer sleeve that cooperates with the inner limiting block; the lower end of the outer sleeve is connected to a hinged pile tip 8 by a movable connecting pin 7; the diameter of the steel pipe is 219mm-800mm to form a gravel pile with a suitable amount of sand or gravel; the upper part of the steel pipe is provided with backfill sand or... The feed inlet for sand and gravel; the distance between the upper limit block and the lower limit block is 500-700mm to ensure sufficient outflow of sand or gravel from the steel pipe; when the steel pipe sinks, the inner limit block at the bottom of the steel pipe cooperates with the lower limit block on the outer sleeve, causing the outer sleeve and the valve tip to sink together, at which time the valve is in a closed state; when the steel pipe is pulled up, the inner limit block at the bottom of the steel pipe cooperates with the upper limit block on the outer sleeve, causing the outer sleeve and the valve tip to move upward together, at which time the valve tip opens under the action of gravity.
[0011] The feed inlet is 0.2-5m below the upper end of the steel pipe to ensure that enough sand or gravel can flow smoothly into the steel pipe. Since the upper end of the steel pipe is flush with the surface of the backfill sand layer after construction, the feed inlet is 0.2-5m below the sand filling surface.
[0012] A PVC grouting pipe 9 is installed in the steel pipe for post-grouting or injection of microbial diagenetic agent (or the PVC grouting pipe is not installed in the steel pipe for post-grouting or injection of microbial diagenetic agent, or the PVC grouting pipe is not used for injection of microbial diagenetic agent).
[0013] During construction, a 0.5-6m thick layer of backfill sand or gravel is first placed on the Sabaha soil layer. A steel pipe is then driven into the bottom of the Sabaha soil layer through the backfill sand or gravel layer. Sand from the backfill sand or gravel layer enters the vibrating steel pipe through its inlet, forming a backfill sand or gravel filling column. The steel pipe is then pulled out, and the backfill sand or gravel filling column flows out from the tip of the hinged pile, forming a sand or gravel pile. In the next step of cement-soil pile construction, the sand or gravel pile and soil are mixed together with cement from the backfill sand or gravel layer to the bottom of the Sabaha soil layer, or from the backfill sand or gravel layer to the hard, dense sand layer below the Sabaha soil layer, to form a cement-soil pile.
[0014] Before the backfill sand or gravel layer is formed and the steel pipe is pulled out, grouting or microbial diagenetic agents can be injected through PVC grouting pipes to form diagenesis as needed.
Claims
1. A rapid discharge sand and gravel pile construction device, characterized in that: The system includes a steel pipe with a vibratory hammer at the upper end and an outer sleeve at the lower end. The steel pipe has an inner limiting block at its bottom, an upper limiting block that mates with the inner limiting block at the upper end of the outer sleeve, and a lower limiting block that mates with the inner limiting block at the lower end of the outer sleeve. The lower end of the outer sleeve is connected to the valve tip via a movable connecting pin. The steel pipe diameter is 219mm-800mm. The upper part of the steel pipe has an inlet for backfilling sand or gravel. The distance between the upper and lower limiting blocks is 500-700mm. When the steel pipe sinks, the inner limiting block at the bottom of the steel pipe mates with the lower limiting block on the outer sleeve, causing the outer sleeve and the valve tip to sink together, at which point the valve is closed. When the steel pipe is pulled upwards, the inner limiting block at the bottom of the steel pipe mates with the upper limiting block on the outer sleeve, causing the outer sleeve and the valve tip to move upwards together, at which point the valve tip opens under gravity.
2. The rapid discharge sand and gravel pile construction device according to claim 1, characterized in that: The feed inlet is 0.2~5m below the upper end of the steel pipe.
3. A rapid discharge gravel pile construction device according to claim 1 or 2, characterized in that: A PVC grouting pipe is installed in the steel pipe for post-grouting or injection of microbial diagenetic agents.