CN211851857U - Advanced support pipe shed structure under silty-fine sand geological condition - Google Patents
Advanced support pipe shed structure under silty-fine sand geological condition Download PDFInfo
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- CN211851857U CN211851857U CN202020456934.7U CN202020456934U CN211851857U CN 211851857 U CN211851857 U CN 211851857U CN 202020456934 U CN202020456934 U CN 202020456934U CN 211851857 U CN211851857 U CN 211851857U
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Abstract
The utility model discloses a super preceding support pipe shed structure under silty sand geological conditions and construction method thereof, include along the door font pipe shed that design box culvert outer contour line arranged, be provided with a plurality of levels around the every steel pipe of door font pipe shed respectively and spout the stake soon, adjacent the level spouts soon between the stake and the level spouts soon and spout stake and adjacent steel pipe between mutual interlock overlap joint, forms steel pipe + level and spouts a consolidation body soon. The utility model has the advantages that the grout of the horizontal jet grouting pile is limited in the reinforcement range of the door-shaped pipe shed soil body, and the grout injection position and range can be controlled by the jet grouting pile machine; the high-pressure cement slurry cuts and destroys the fine sand layer to form a mixture consisting of cement and fine sand to form a frame, so that the high-grade highway subgrade is effectively supported and isolated, the stable protection effects of sand flowing prevention, slippage prevention and seepage prevention are achieved, and the safety guarantee is provided for the construction of the long-span pushing box culvert.
Description
Technical Field
The utility model relates to a box culvert lower part passes through highway engineering construction field, especially relates to supporting tube shed structure before surpassing under the silty sand geological conditions.
Background
Under the condition of not influencing ground activities, box culverts are adopted to pass through high-grade roads, municipal overpasses and the like, and the construction method of supporting the box culverts by an advanced pipe shed is usually adopted for construction. The pipe-shed construction is a leading support structure in shallow-buried excavation of an underground structural project; the essence of the method is that holes are drilled in advance and steel pipes with large inertia moment and provided with flower holes are driven into the periphery of a box culvert structural project to be excavated and jacked, cement slurry is injected into surrounding soil bodies through the flower holes of the steel pipes, so that the steel pipes, the cement slurry and the surrounding soil bodies are coagulated into a reinforcement body to play a role of temporary advanced support, and the collapse of soil layers outside a pipe shed and the subsidence of the earth surface are prevented so as to ensure the safe jacking of the box culvert.
However, when the geological condition is mainly a fine sand layer, the fine sand layer has the characteristics of low cohesive force, poor self-stability and certain fluidity, so that the collapse is easy to occur under the condition of long-time exposure. Therefore, the construction by adopting the prior advanced pipe shed supporting method has the problems of small diffusion of cement paste in a fine sand layer and poor coagulation effect of cement paste and soil mass, and can not meet the design requirement of wrapping a steel pipe to form a pipe shed supporting body structure.
Disclosure of Invention
The utility model aims to provide a guard tube shed structure before surpassing under fine sand geological conditions.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
look advance support pipe shed structure under fine sand geological conditions, include along the door font pipe shed that design box culvert outer contour line arranged, center on be provided with a plurality of levels around the every steel pipe of door font pipe shed respectively and spout the stake soon, adjacent the level spouts soon between the stake and the level spouts soon and spout stake and adjacent steel pipe between mutual interlock overlap joint, forms steel pipe + level and spouts soon the stake consolidation body.
Cement mortar is filled in each steel pipe of the door-shaped pipe shed.
The utility model discloses the advantage mainly embodies in following aspect:
1. controllability: the grout of the horizontal jet grouting pile is limited in the reinforcement range of the soil body of the door-shaped pipe shed, and the injection position and range of the grout can be controlled by the jet grouting pile machine; the high-pressure cement slurry cuts and destroys the fine sand layer to form a mixture consisting of cement and fine sand, and the steel pipe and horizontal jet grouting pile consolidation body meeting the design requirements can be obtained by adjusting injection parameters.
2. Uniformity: the jet flows are intersected before the energy is attenuated, the cutting energy of the cement grout is counteracted at the collision point, the jet flow can not cut the soil body at the position with a long distance from the pile core to the collision point, and the uniformity degree of the reinforced body is good.
3. Low cost and high efficiency: because the injection range is limited, the cement consumption is less, and the construction speed is high.
4. The stability is good: forming a closed steel pipe and horizontal jet grouting pile reinforcing body at the top and two sides of the box culvert to be jacked; the steel pipe is used as a longitudinal support, and the horizontal jet grouting pile consolidation body is used as a transverse connection reinforcement to form a frame, so that the high-grade highway subgrade is effectively supported and isolated, the stable protection effects of sand flowing prevention, slippage prevention and seepage prevention are achieved, and the safety guarantee is provided for the construction of the long-span pushing box culvert.
Drawings
Fig. 1 is a schematic diagram of the advanced supporting pipe shed structure of the utility model passing through the road.
Fig. 2 is an enlarged schematic view of a portion a of fig. 1.
Fig. 3 is the cross-sectional structure schematic diagram of advance support pipe shed structure of the utility model.
Fig. 4 is an enlarged schematic view of a portion B of fig. 3.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1-4, the advanced supporting pipe shed structure under the silty-fine sand geological condition of the present invention comprises a door-shaped pipe shed which is arranged along the outer contour line of a designed box culvert 1 and is formed by arranging steel pipes 2, wherein cement mortar 3 is filled in each steel pipe 2 in a pouring manner; every steel pipe 2 around door font pipe shed is provided with a plurality of levels respectively and spouts stake 4 soon, and the interlock overlap joint each other between the stake 4 is spouted soon to adjacent level and between level spout 4 and adjacent steel pipe 2 soon forms steel pipe + level and spouts a stake consolidation body soon.
Construction method of advance support pipe shed structure under fine sand geological conditions goes on according to following step:
s1, horizontally drilling holes at intervals along the outer contour line of the box culvert 1 by using a pipe shed drilling machine in a working pit 6 on one side of the to-be-crossed highway 5 to form holes arranged in a shape of a Chinese character 'men', wherein each hole horizontally penetrates through fine sand soil below the to-be-crossed highway 5 to a receiving pit 7 on the other side of the to-be-crossed highway 5;
s2, punching a steel pipe 2 into each hole to form a door-shaped pipe shed;
s3, adopting a high-pressure jet grouting pile construction method, adopting a jet grouting pile machine in the working pit 6, and respectively carrying out horizontal jet grouting pile construction around each steel pipe 2 of the door-shaped pipe shed, thereby forming a horizontal cylindrical cement powder fine sand mixed consolidation body, namely a horizontal jet grouting pile 4, around each steel pipe 2; when the horizontal jet grouting piles 4 are constructed, the high-pressure pump is used for controlling the jet pressure of high-pressure cement slurry, so that the adjacent horizontal jet grouting piles 4 and the adjacent steel pipes 2 are mutually occluded and lapped to form a steel pipe and horizontal jet grouting pile consolidation body;
and (3) horizontal jet grouting pile construction: the cement type can adopt ordinary Portland cement of P.O 42.5.5 or above, the common water cement ratio is 0.3-1, the rotary spraying pressure of the horizontal rotary spraying pile is 20-35 MPa, the drilling speed of a drill rod is 25-35 cm/min, and the withdrawal speed of the drill rod is 15-25 cm/min. Before construction, a horizontal jet grouting pile test is required, and quality detection of the test pile is carried out, so that a construction scheme is determined;
and S4, pouring cement mortar 3 into each steel pipe 2 of the door-shaped pipe shed to complete construction of the forepoling pipe shed structure.
Claims (2)
1. The utility model provides a super preceding support pipe shed structure under silty sand geological conditions, includes the door font pipe shed of arranging along design box culvert outer contour line, its characterized in that: and a plurality of horizontal rotary spraying piles are respectively arranged around each steel pipe of the door-shaped pipe shed, and the adjacent horizontal rotary spraying piles and the adjacent steel pipes are mutually occluded and lapped to form a steel pipe and horizontal rotary spraying pile consolidation body.
2. The silty-fine sand geological condition forward supporting pipe shed structure according to claim 1, characterized in that: cement mortar is filled in each steel pipe of the door-shaped pipe shed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020456934.7U CN211851857U (en) | 2020-04-01 | 2020-04-01 | Advanced support pipe shed structure under silty-fine sand geological condition |
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| CN202020456934.7U CN211851857U (en) | 2020-04-01 | 2020-04-01 | Advanced support pipe shed structure under silty-fine sand geological condition |
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| CN211851857U true CN211851857U (en) | 2020-11-03 |
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| CN202020456934.7U Active CN211851857U (en) | 2020-04-01 | 2020-04-01 | Advanced support pipe shed structure under silty-fine sand geological condition |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188638A (en) * | 2020-04-01 | 2020-05-22 | 黄河勘测规划设计研究院有限公司 | Advanced support pipe shed structure under silty-fine sand geological condition and construction method thereof |
| CN115404757A (en) * | 2022-09-09 | 2022-11-29 | 上海市隧道工程轨道交通设计研究院 | Lower overpass underground pipeline bridge system |
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2020
- 2020-04-01 CN CN202020456934.7U patent/CN211851857U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188638A (en) * | 2020-04-01 | 2020-05-22 | 黄河勘测规划设计研究院有限公司 | Advanced support pipe shed structure under silty-fine sand geological condition and construction method thereof |
| CN115404757A (en) * | 2022-09-09 | 2022-11-29 | 上海市隧道工程轨道交通设计研究院 | Lower overpass underground pipeline bridge system |
| CN115404757B (en) * | 2022-09-09 | 2024-06-04 | 上海市隧道工程轨道交通设计研究院 | Underground pipeline bridge system of lower overpass |
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