CN110055845B - Construction method for soft soil roadbed on two sides of highway bridge and culvert - Google Patents
Construction method for soft soil roadbed on two sides of highway bridge and culvert Download PDFInfo
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- CN110055845B CN110055845B CN201910408022.4A CN201910408022A CN110055845B CN 110055845 B CN110055845 B CN 110055845B CN 201910408022 A CN201910408022 A CN 201910408022A CN 110055845 B CN110055845 B CN 110055845B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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Abstract
The invention discloses a construction method of soft soil roadbeds on two sides of a highway bridge and culvert, which comprises the following steps: s1, designing positions, and determining a drain hole and a piling position according to the processing range of the soft soil roadbed; s2, manufacturing drain holes, drilling the drain holes at corresponding positions of the soft soil roadbed, and then reinforcing the side walls of the drain holes through pervious concrete; s3, piling, namely, driving the wooden piles into the corresponding positions of the soft soil roadbed; s4, draining, namely draining accumulated water in the drainage holes; and S5, filling materials, and filling coarse sand or stones in the drain holes. The pile can extrude the soft soil road bed, can the compaction soft soil road bed, can squeeze into the wash port with the moisture in the soft soil road bed again to reduce water content and the space in the soft soil road bed, then with water from the wash port take out futilely can, so, can effectual improvement soft soil road bed, wash port and stake can play the effect of support again in the later stage simultaneously, under both combinations, can effectively improve the life of road on the soft soil road bed.
Description
Technical Field
The invention relates to the technical field of soft soil roadbed construction, in particular to a construction method of soft soil roadbeds on two sides of a highway bridge.
Background
Due to the rapid development of market economy in China and the development of tourism industry, the projects of highway and bridge buildings in China are gradually increased, and the construction and technical treatment of soft soil foundations are required to be done to a great extent to build more qualified highway and bridge buildings.
Because of the softness of the soft foundation, the general soft foundation is not suitable for being used as a bearing stratum, and the soft foundation needs to be treated to a certain degree in order to lay a foundation for the formation of the foundation. Soft soils are susceptible to pressure deformation and settling due to high water content, large pores, high compressibility, and low shear strength. If the soft soil foundation is not well treated in the construction process of bridge highway engineering, the phenomena of settlement, unilateral expansion, slippage and the like of high embankments at some bridge heads can be caused, so that the service life of the bridge is shortened, and the safety of people and vehicles is even endangered.
Aiming at soft soil roadbeds on two sides of bridges and culverts, the current common treatment methods mainly comprise a filling and replacing method, a preloading method, a lime-soil pile, a CFG pile, a cement mixing pile, a reinforced concrete pile and a dynamic compaction method, and the main principles of realizing reinforcement by the methods are mainly divided into two types, wherein one type is the filling and replacing method and the preloading method, namely the structure of the surface layer of the soft soil roadbed is reinforced; and the other is to support the road surface by piling. Although the soft soil roadbed can be reinforced, the settlement to a certain degree still can be generated after the soft soil roadbed is used for a certain period of time, and therefore the existing reinforcing mode still needs to be optimized, and the service life of the existing reinforcing mode is prolonged.
Disclosure of Invention
The invention aims to provide a construction method of soft soil subgrades on two sides of a highway bridge and culvert, which has the effect of prolonging the service life of a road positioned at a soft soil subgrade section.
The technical purpose of the invention is realized by the following technical scheme:
a construction method of soft soil roadbeds on two sides of a highway bridge and culvert comprises the following steps:
s1, designing positions, and determining a drain hole and a piling position according to the processing range of the soft soil roadbed;
s2, manufacturing drain holes, drilling the drain holes at corresponding positions of the soft soil roadbed, and then reinforcing the side walls of the drain holes through pervious concrete;
s3, piling, namely, driving the wooden piles into the corresponding positions of the soft soil roadbed;
s4, draining, namely draining accumulated water in the drainage holes;
and S5, filling materials, and filling coarse sand or stones in the drain holes.
So set up, the pile can extrude the soft soil road bed, can the compaction soft soil road bed, can extrude the wash port with the moisture in the soft soil road bed again, thereby reduce water content and space in the soft soil road bed, then with water from the wash port take out do, so, can effectual improvement soft soil road bed, wash port and stake can play the effect of support again in the later stage simultaneously, under both combinations, can effectively improve the soft soil road bed on the road life.
More preferably: the method further comprises the step S6 of compacting, wherein the soft soil roadbed is compacted through the road roller.
So set up, after carrying out the compaction through the stake and reducing the space, carry out the compaction to soft soil roadbed surface again, wherein, the stake can improve darker soil, but corresponding, and its improvement effect can be less than the surface compaction, consequently, the rethread carries out the compaction to the surface on the basis of stake, can very effectual improvement soft soil roadbed's bulk strength.
More preferably: before compaction, a stone cushion layer is paved on the surface of the soft soil roadbed through stones.
So set up, the surface layer intensity of the soft soil roadbed of strengthening that can be further that laying of stone makes its difficult situation emergence that appears deformation such as local sunken.
More preferably: and a sand cushion layer is laid below the stone cushion layer through gravel.
So set up, the setting of sand cushion layer can play waterproof effect, strengthens the back to the soft soil road bed in the earlier stage, in the later stage use, if get into too much moisture in the soft soil road bed, can influence its life equally, consequently, the separation of sand cushion layer can further prolong the life of soft soil road bed.
More preferably: in the step S2, when the pervious concrete reinforces the side wall of the drainage hole, a water suction pipe is arranged in the formed concrete reinforcing layer, the bottom end of the water suction pipe penetrates through the concrete reinforcing layer and is communicated with the drainage hole, and the top end of the water suction pipe penetrates through the top of the concrete reinforcing layer to form a water suction port;
after the compaction of step S6 is completed, the water in the drain hole is sucked out through the suction pipe.
In the compaction process of the surface of the soft soil base layer, part of water can enter the drain holes, so that most of water in the water can be pumped out through the water suction pipe, the situation that the water in the compaction process is pressed deeply to cause the water in the soil in the deep part to be too much and become soft can be avoided, and the soft soil base layer can be better improved.
More preferably: the concrete reinforcing layer is poured in the following mode:
inserting a plastic pipe with a diameter smaller than that of the drain hole into the drain hole, wherein the bottom end of the water suction pipe penetrates through the plastic pipe and is inserted into the drain hole together with the plastic pipe; then pouring the pervious concrete into a gap formed between the plastic pipe and the inner wall of the drainage hole.
So set up, accomplish pouring of concrete back up coat, simultaneously, can accomplish the fixed of suction pipe when pouring.
More preferably: the plastic pipe comprises an outer pipe and an inner pipe inserted in the outer pipe, and a plurality of through holes are formed in the outer pipe; and taking out the inner pipe before the concrete reinforcing layer is solidified after the concrete reinforcing layer is poured.
So set up, can accomplish pouring of concrete back up coat through the plastic tubing, simultaneously, because the setting of interior outer tube, interior outer tube can be in the space that forms between the inner wall of plastic tubing and wash port with the concrete restriction when pouring, and after pouring is accomplished, can take out the inner tube, and the outer tube is in the same place with concrete placement, so, the through-hole on the outer tube makes concrete back up coat and the downthehole intercommunication of drainage, avoids forming waterproof structure, leads to in the soil normal water can't get into the wash port.
More preferably: in step S5, a stone block is buried in the drain hole.
So set up, the gap is less between the grit, and the water storage capacity is few, and the stone then has great water yield, in addition, can also avoid the grit to plug up the pipe that absorbs water.
More preferably: the thickness of the sand cushion layer is 0.6-1 m.
So set up, ensure its water-proof effects, consolidate the top layer on soft soil basic unit simultaneously, make it further difficult emergence subside.
More preferably: the sand cushion layer is paved by fine sand.
So set up, the gap that fine sand laid the formation is littleer, can effectively improve the water-proof effects of sand cushion layer.
In conclusion, the invention has the following beneficial effects:
1. the soft soil base layer is improved by the wood piles and the surface layer compaction, so that gaps and water in the soft soil base layer are effectively reduced;
2. the arrangement of the wooden piles and the drain holes can play a role in supporting, so that the road on the soft soil roadbed is not easy to settle;
3. the setting of sand bed course and stone bed course can consolidate the top layer structural strength of weak soil basic unit, can play fine water-proof effects simultaneously, avoids too much water infiltration weak soil basic unit to cause its becoming soft once more.
Drawings
FIG. 1 is a schematic structural view of a drainage hole in the present embodiment, showing a structure when a concrete reinforcing layer is poured;
FIG. 2 is a schematic view of the construction of the present embodiment when piling;
FIG. 3 is a schematic view showing the positional relationship between the drainage hole and the timber pile in the present embodiment;
fig. 4 is a schematic structural diagram of the medium voltage system of the present embodiment.
In the figure, 100, a drain hole; 200. a plastic tube; 210. an outer tube; 211. a through hole; 220. an inner tube; 300. a suction pipe; 400. a concrete reinforcing layer; 500. piling wood; 600. a sand cushion layer; 700. and (4) a stone cushion layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
A construction method of soft soil roadbeds on two sides of a highway bridge and culvert comprises the following steps:
s1, designing positions, measuring basic parameters such as water content and softness of a soft soil foundation layer, drawing a drawing according to the processing range of the soft soil foundation layer, and determining a drain hole 100 and a piling position;
s2, manufacturing a drain hole 100, and drilling the drain hole 100 at a corresponding position of the soft soil roadbed through a drilling machine according to a drawing, wherein the diameter of the drain hole 100 is 0.5-1 m, the depth of the drain hole 100 is 5-10 m, and specific data of the drain hole 100 are determined according to basic parameters such as water content and softness of a soil foundation layer.
After the hole is punched, as shown in fig. 1, a plastic pipe 200 is inserted into the drainage hole 100, wherein a water suction pipe 300 is inserted while the plastic pipe 200 is inserted, the water suction pipe 300 is located in a gap formed between the plastic pipe 200 and the inner wall of the drainage hole 100, the bottom end of the water suction pipe 300 penetrates out of the bottom of the plastic pipe 200 into the drainage hole 100, and the top end of the water suction pipe 300 is located at the opening of the drainage hole 100 and is located at a height 0.5m lower than the opening of the drainage hole 100.
After the insertion of the plastic pipe 200 is completed, the concrete pouring machine pours the pervious concrete into the gap formed between the plastic pipe 200 and the inner wall of the drainage hole 100, thereby reinforcing the side wall of the drainage hole 100 to form the concrete reinforcing layer 400, wherein the concrete pouring height cannot exceed the opening at the top of the suction pipe 300, so that the suction pipe 300 forms a water suction port at the top of the concrete reinforcing layer 400.
The plastic tube 200 includes an outer tube 210 and an inner tube 220, and the inner tube 220 is inserted into the outer tube 210 and is attached to the outer tube. The outer pipe 210 is provided with a plurality of through holes 211, the through holes 211 are distributed on the entire outer pipe 210, and in order to have a certain water stopping effect, the through holes 211 may be formed in a tapered structure with the tip facing the axial center line, and the inner pipe 220 may be taken out of the water discharge hole 100 after the pouring of the concrete reinforcing layer 400 is completed and before the concrete is solidified.
S3, piling, as shown in figures 2 and 3, after the concrete reinforcing layer 400 is cured, driving the wooden piles 500 into corresponding positions of the soft soil roadbed according to a drawing, wherein the distance between the wooden piles 500 is larger than 1.5m, the wooden piles 500 form a wave shape on the soft soil roadbed, and the two adjacent rows of water holes 100 are respectively positioned on two sides of the wave shape, so that the water in the soft soil roadbed can be better discharged.
And S4, draining water, and draining accumulated water in the drainage hole 100 after the pile driving operation is finished.
And S5, filling the drain hole 100 with a block, wherein the block is filled to the same height as the top of the concrete reinforcing layer 400.
S6, compacting, and as shown in figure 4, paving a sand cushion 600 on the surface of the soft soil roadbed through fine sand, wherein the thickness of the sand cushion 600 is 0.6-1 m, and the thicker the sand cushion is, the better the sand cushion is. A stone cushion layer 700 is laid above the sand cushion layer 600 through stones, wherein the sand cushion layer 600 and the stone cushion layer 700 are avoided from the drainage holes 100 when being laid, and after the laying is completed, the stone cushion layer is compacted through a road roller, wherein the compaction frequency is 5-10 times, the compaction effect is determined, and when the height difference is basically unchanged after two adjacent times of compaction, the stone cushion layer is obtained.
After the compaction is completed, water accumulated in the drainage hole 100 is pumped out through the water suction port, and then the drainage hole 100 is buried by fine sand and stone.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the present invention.
Claims (6)
1. A construction method of soft soil roadbeds on two sides of a highway bridge and culvert is characterized by comprising the following steps:
s1, designing positions, and determining a drain hole (100) and a piling position according to the processing range of the soft soil roadbed;
s2, manufacturing a drain hole (100), drilling the drain hole (100) at the corresponding position of the soft soil roadbed, and then reinforcing the side wall of the drain hole (100) through pervious concrete;
the concrete reinforcing layer (400) is poured in the following mode:
firstly, inserting a plastic pipe (200) with the diameter smaller than that of the drain hole (100) into the drain hole (100), wherein the bottom end of the water suction pipe (300) penetrates through the plastic pipe (200) and is inserted into the drain hole (100) together with the plastic pipe (200); then pouring the pervious concrete into a gap formed between the plastic pipe (200) and the inner wall of the drain hole (100);
the plastic pipe (200) comprises an outer pipe (210) and an inner pipe (220) inserted into the outer pipe (210), and a plurality of through holes (211) are formed in the outer pipe (210); wherein the inner pipe (220) is taken out after the pouring of the concrete reinforcing layer (400) is finished and before the concrete reinforcing layer is solidified;
when the side wall of the drain hole (100) is reinforced by pervious concrete, a water suction pipe (300) is arranged in a formed concrete reinforcing layer (400), the bottom end of the water suction pipe (300) penetrates through the concrete reinforcing layer (400) to be communicated with the drain hole (100), and the top end of the water suction pipe (300) penetrates through the top of the concrete reinforcing layer (400) to form a water suction port;
s3, piling, namely driving the wooden piles (500) into corresponding positions of the soft soil roadbed, wherein the distance between the wooden piles (500) is larger than 1.5m, the wooden piles (500) are formed into a wave shape on the soft soil roadbed, and the adjacent two rows of water holes (100) are respectively positioned on two sides of the wave shape;
s4, draining, namely draining accumulated water in the drain hole (100);
s5, filling materials, namely filling coarse sand or stones in the drain holes (100);
s6, compacting, namely compacting the soft soil roadbed through a road roller;
after the compaction of step S6 is completed, the water in the drain hole (100) is sucked out through the suction pipe (300).
2. The construction method of the soft soil roadbed on the two sides of the highway bridge and culvert according to claim 1, characterized by comprising the following steps: before compaction, a stone cushion layer (700) is paved on the surface of the soft soil roadbed through stones.
3. The construction method of the soft soil roadbed on the two sides of the highway bridge and culvert according to claim 2, characterized by comprising the following steps: and a sand cushion layer (600) is laid below the stone cushion layer (700) through gravel.
4. The construction method of the soft soil roadbed on the two sides of the highway bridge and culvert according to claim 2, characterized by comprising the following steps: in step S5, a stone block is buried in the drain hole (100).
5. The construction method of the soft soil roadbed on the two sides of the highway bridge and culvert according to claim 3, characterized by comprising the following steps: the thickness of the sand cushion layer (600) is 0.6-1 m.
6. The construction method of the soft soil roadbed on the two sides of the highway bridge and culvert according to claim 5, characterized by comprising the following steps: the sand cushion layer (600) is paved by fine sand.
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| CN112575638B (en) * | 2020-12-11 | 2022-11-11 | 宁波华康陆鼎建设有限公司 | Roadbed reinforcing structure adopting steel reinforcement cage bamboo shoot piles and construction process of roadbed reinforcing structure |
| CN114808580B (en) * | 2022-05-10 | 2023-12-12 | 安徽厚普建设工程有限公司 | Construction method for anti-sedimentation highway subgrade in soft soil area |
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| JP2000170149A (en) * | 2000-01-01 | 2000-06-20 | Tokyo Sekkei Jimusho Kk | Forming method for underground pile and equipment therefor |
| CN101024951A (en) * | 2007-03-16 | 2007-08-29 | 陈俊生 | Foundation processing method |
| CN104060601B (en) * | 2014-04-25 | 2016-05-11 | 上海岩土工程勘察设计研究院有限公司 | The construction method of utilizing precast construction stake pile foundation to carry out ground processing |
| CN104278666B (en) * | 2014-10-11 | 2016-05-25 | 南京赛伯通建筑工程有限公司 | A kind of packed plastic water draining device |
| CN105804046A (en) * | 2016-04-06 | 2016-07-27 | 化学工业岩土工程有限公司 | Processing method for soft clay foundation |
| CN206385531U (en) * | 2016-10-27 | 2017-08-08 | 上海欧本钢结构有限公司 | A kind of pile tube device of reinforcing soft ground |
| CN107287999A (en) * | 2017-06-09 | 2017-10-24 | 中国铁建大桥工程局集团有限公司 | Rigid pile composite foundation united drainage consolidation reinforces highway soft soil ground construction |
| CN108999177A (en) * | 2018-08-06 | 2018-12-14 | 宁波市交通规划设计研究院有限公司 | Accelerate discharging consolidation and increases the Soft Ground structures and methods of bearing capacity |
| CN109736290A (en) * | 2018-12-18 | 2019-05-10 | 安徽同济建设集团有限责任公司 | A kind of construction method of soft foundation |
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