Sand-gravel pile construction method capable of achieving rapid discharging
By covering the backfill sand or gravel layer on the Sabaha soil layer and using steel pipes with the tip of the flap piles to form sand and gravel piles, the problem of easy slipping piles and uncontrollable verticality during construction in the weak soil layer is solved, and the effect of improving the sand content of the soil layer and the strength of the cement soil piles is achieved, and the water content of the soil layer is reduced through the drainage channel of the sand and gravel piles is reduced.
Patent Information
- Application Number
- CN202510311565.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2025-05-06
AI Technical Summary
In the weak Sabaha soil layer in the coastal area of Sabaha in the Middle East, the cement soil piles are prone to slip and the verticality is out of control during construction, making it difficult to effectively improve the sand content of the soil layer and the strength of the cement soil piles.
The backfill sand or sand and gravel layer is covered with 0.5-6m thick backfill sand or sand and gravel layer. Use a steel pipe with a flap pile tip to penetrate from the backfill layer to the bottom of the soil layer. The backfill sand or sand and gravel layer enter into the steel pipe through the feed port of the steel pipe to form a filling column. When the steel pipe is pulled out, the filling column flows out from the flap pile tip to form a sand or sand and gravel pile.
By forming sand and gravel piles, the sand content of the Sabah soil layer is effectively improved, the strength of the cement soil pile is enhanced, and the water content of the soil layer is quickly reduced through the drainage channel of the sand and gravel piles, improving the stability of the soil layer.
Smart Images
Figure CN119933118A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a sandstone pile construction method. Background Art
[0002] The geological conditions in the coastal area of the Sabaha in the Middle East are extremely complex. The upper 4 to 15 meters of the area is a soft Sabkha soil layer with high water content (water content > 60%), high salt content, high compressibility and low bearing capacity. Cement soil piles are prone to slipping and verticality loss during construction. Summary of the invention
[0003] The object of the present invention is to provide a fast-discharging gravel pile construction method which can effectively increase the sand content of the Sabaha soil layer and improve the strength of the cement soil pile.
[0004] The technical solution of the present invention is: A method for constructing a gravel pile with rapid material discharge, characterized in that: a backfill sand or gravel layer with a thickness of 0.5-6 m is covered on a Sabagha soil layer, and then a steel pipe with a valve pile tip at the bottom is driven from the backfill or gravel layer to the bottom of the Sabagha soil layer, and the sand of the backfill sand or gravel layer enters the steel pipe from the feed port of the vibrating steel pipe to form a backfill sand or gravel layer filling column; the steel pipe is pulled out, and the backfill sand or gravel layer filling column flows out from the valve pile tip to form a sand or gravel pile; The steel pipe with a flap pile tip comprises a steel pipe, a vibrating hammer is provided at the upper end of the steel pipe, an outer sleeve is mounted at the lower part of the steel pipe, an inner limit block is provided at the bottom of the steel pipe, an upper limit block cooperating with the inner limit block is provided at the upper end of the outer sleeve, and a lower limit block cooperating with the inner limit block is provided at the lower part of the outer sleeve; the lower end of the outer sleeve is connected to the flap pile tip by a movable connecting pin; the diameter of the steel pipe is 219mm-425mm; a feeding port for backfill sand or gravel is provided at the upper part of the steel pipe; the distance between the upper limit block and the lower limit block is 500-700mm; 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 to drive the outer sleeve and the flap pile tip to sink together, and the flap is in a closed state at this time; 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 to drive the outer sleeve and the flap pile tip to move upward together, and the flap pile tip is opened under the action of gravity.
[0005] The feed port is 0.2-5 m lower than the upper end surface of the steel pipe. A PVC grouting pipe for post-grouting or injection of microbial diagenetic agent is arranged in the steel pipe.
[0006] The present invention can form gravel piles in the Sabaha soil layer, and the gravel piles formed in the Sabaha soil layer play a role in compaction, drainage and consolidation; effectively increase the sand content of the Sabaha soil layer and the strength of the cement soil pile. In the cement soil of the Sabaha soil layer, the strength can be increased by 0.06MPa for every 1% increase in sand content. The gravel piles formed serve as drainage channels and hollow channels formed by the stirring shaft in the cement soil, and then split by high-pressure gas to form a mesh drainage and exhaust channel, which quickly reduces the water content in the soft soil layer. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0008] Figure 1 It is a schematic structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION
[0009] A method for constructing a gravel pile with rapid material discharge, comprising: covering a 0.5-6m thick backfill sand or gravel layer on a Sabaha soil layer, and then driving a steel pipe with a valve pile tip at the bottom from the backfill or gravel layer to the bottom of the Sabaha soil layer, and allowing sand of the backfill sand or gravel layer to enter the steel pipe from a feeding port of the vibrating steel pipe to form a backfill sand or gravel layer filling column; pulling out the steel pipe, and allowing the backfill sand or gravel layer filling column to flow out from the valve pile tip to form a sand or gravel pile; The steel pipe with a valve pile tip comprises a steel pipe 1, a vibrating hammer 2 is provided at the upper end of the steel pipe, an outer sleeve 3 is sleeved at the lower part of the steel pipe, an inner limit block 4 is provided at the bottom of the steel pipe, an upper limit block 5 is provided at the upper end of the outer sleeve to match the inner limit block, and a lower limit block 6 is provided at the lower part of the outer sleeve to match the inner limit block; the lower end of the outer sleeve is connected to the valve pile tip 8 by a movable connecting pin 7; the diameter of the steel pipe is 219mm-425mm 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 gravel The distance between the upper limit block and the lower limit block is 500-700mm to ensure the sufficient outflow of sand or gravel in 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 to drive the outer sleeve and the flap pile tip to sink together, and the flap is in a closed state at this time; 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 to drive the outer sleeve and the flap pile tip to move upward together, and the flap pile tip opens under the action of gravity.
[0010] The feed port is 0.2~5m lower than the upper end surface of the steel pipe to ensure that enough sand or gravel flows smoothly into the steel pipe; after construction, the upper end of the steel pipe is flush with the surface of the backfill sand layer, so the feed port is 0.2~5m lower than the sand filling surface.
[0011] A PVC grouting pipe 9 for post-grouting or injection of microbial diagenetic agent is arranged in the steel pipe (of course, the PVC grouting pipe for post-grouting or injection of microbial diagenetic agent may not be arranged in the steel pipe, or the VC grouting pipe may not be used for injection of microbial diagenetic agent).
[0012] During the construction of the present invention, a 0.5-6m thick backfill sand or gravel layer is first covered on the Sabaha soil layer, and then a steel pipe is driven from the backfill sand or gravel layer to the bottom of the Sabaha soil layer, and the sand of the backfill sand or gravel layer enters the steel pipe from the feed port of the vibrating steel pipe to form a backfill sand or gravel layer filling column; the steel pipe is pulled out, and the backfill sand or gravel layer filling column flows out from the valve pile tip to form a sand or gravel pile. Then, during the next step of cement soil pile construction, cement soil is mixed on the sand or gravel pile and the soil together 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 and dense sand layer below the Sabaha soil layer, to form a cement soil pile.
[0013] Before forming the backfill sand or gravel layer filling column and pulling out the steel pipe, diagenesis can be further carried out by grouting or injecting microbial diagenetic agent through PVC grouting pipe as needed.
Claims
1. A method for constructing a sandstone pile with rapid discharge, characterized in that: The Sabaha soil layer is covered with a 0.5-6m thick backfill sand or gravel layer, and then a steel pipe with a valve pile tip at the bottom is driven from the backfill or gravel layer to the bottom of the Sabaha soil layer, and the sand of the backfill sand or gravel layer enters the steel pipe from the feed port of the vibrating steel pipe to form a backfill sand or gravel layer filling column; the steel pipe is pulled out, and the backfill sand or gravel layer filling column flows out from the valve pile tip to form a sand or gravel pile; The steel pipe with a flap pile tip comprises a steel pipe, a vibrating hammer is provided at the upper end of the steel pipe, an outer sleeve is mounted at the lower part of the steel pipe, an inner limit block is provided at the bottom of the steel pipe, an upper limit block cooperating with the inner limit block is provided at the upper end of the outer sleeve, and a lower limit block cooperating with the inner limit block is provided at the lower part of the outer sleeve; the lower end of the outer sleeve is connected to the flap pile tip by a movable connecting pin; the diameter of the steel pipe is 219mm-425mm; a feeding port for backfill sand or gravel is provided at the upper part of the steel pipe; the distance between the upper limit block and the lower limit block is 500-700mm; 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 to drive the outer sleeve and the flap pile tip to sink together, and the flap is in a closed state at this time; 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 to drive the outer sleeve and the flap pile tip to move upward together, and the flap pile tip is opened under the action of gravity.
2. A method for constructing a sandstone pile with rapid discharge according to claim 1, characterized in that: The feed inlet is 0.2-5m lower than the upper end surface of the steel pipe.
3. A method for constructing a sandstone pile with rapid discharge according to claim 1 or 2, characterized in that: A PVC grouting pipe for post-grouting or injection of microbial diagenetic agents is arranged in the steel pipe.