CN212001021U - Soft soil foundation reinforcing structure in dredger fill area - Google Patents

Soft soil foundation reinforcing structure in dredger fill area Download PDF

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Publication number
CN212001021U
CN212001021U CN202020151248.9U CN202020151248U CN212001021U CN 212001021 U CN212001021 U CN 212001021U CN 202020151248 U CN202020151248 U CN 202020151248U CN 212001021 U CN212001021 U CN 212001021U
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soft soil
layer
dredger fill
soil foundation
fill area
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CN202020151248.9U
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张瑜
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Zhejiang Putuo Foundation Base Engineering Co ltd
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Zhejiang Putuo Foundation Base Engineering Co ltd
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Abstract

The utility model relates to a soft soil foundation reinforcing structure in a dredger fill area, which comprises a soft soil foundation, wherein the soft soil foundation comprises a soft soil layer and a dredger fill layer covering the soft soil layer, a first sealing layer is arranged between the soft soil layer and the dredger fill layer, a sand cushion layer is laid on the upper part of the dredger fill layer, and a second sealing layer is arranged on the upper part of the sand cushion layer; the soft soil layer upper berth is equipped with first horizontal drain pipe, and first horizontal drain pipe is connected with drainage device, beats below the sand cushion and is equipped with vertical drain bar, and vertical drain bar bottom is deepened to the soft soil layer, and the wrench end of vertical drain bar is buried in the sand cushion, and the second horizontal drain pipe has been laid to the inslot digging groove in the sand cushion, and the wrench end of second horizontal drain pipe and vertical drain bar meets, and the second horizontal drain pipe is connected with evacuating device. The utility model has the beneficial effects of simple structure, be convenient for construction installation, shorten construction period, avoid the drain pipe to become silted up stifled, accelerate drainage rate and improve reinforcing effect.

Description

Soft soil foundation reinforcing structure in dredger fill area
Technical Field
The utility model relates to a foundation reinforced structure especially relates to a regional weak soil foundation reinforced structure of dredger fill belongs to ground processing technology field.
Background
Since the reform is opened, along with the opening of coastal cities in China, the economy is rapidly developed, the land requirement is increased day by day, and the relatively short shortage of land resources becomes a problem which cannot be ignored in coastal cities. Therefore, reclamation of land from sea becomes a necessary way for solving the problem of land resource shortage in coastal cities.
Dredger fill is also called as flushing fill, and is deposited soil formed by hydraulically dredging silt at the bottoms of rivers and ports by using a dredger and a slurry pump when a river drift is renovated and dredged. In the hydraulic filling process, the silt structure is damaged and slowly deposits in the form of fine particles, so that the hydraulic filling material has the characteristics of large plasticity index, large natural water content and pore ratio, small weight, high compressibility, small permeability and the like. The foundation formed of the dredger fill is poor in strength, cannot be directly used for engineering construction in general, and needs to be treated.
In order to meet the requirements of different foundation treatment requirements, various foundation treatment methods such as a vacuum preloading method, a dynamic compaction method, a high vacuum densification method, a vacuum dynamic consolidation strengthening method, a replacement method and the like are developed in China. The vacuum preloading method is one of the most effective methods for treating dredger fill, silt soil and soft clay foundations, and is widely applied to foundation reinforcement treatment projects such as highways, ports and docks, sea reclamation and the like at present. The vacuum preloading method is that a sand cushion is laid on the surface of the soft soil foundation to be reinforced, then a vertical drainage pipeline is buried, then an airtight sealing film is used for isolating the sand cushion from the atmosphere, the periphery of the film is buried in the soil, and air is pumped by a vacuum device through a water suction pipeline buried in the sand cushion to form vacuum, so that the effective stress of the foundation is increased. However, the drainage consolidation effect of the current vacuum preloading soft soil foundation reinforcement technology is not very obvious, and the research and development of a soft foundation reinforcement structure for coping with a hydraulic filling area are urgently needed, so that the soft foundation treatment can be rapidly and stably carried out on the hydraulic filling area, the engineering quality is ensured, the construction time is reduced, and one of the problems to be solved by technical personnel in the field is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses mainly be to the long, the drain pipe of dredger fill foundation treatment technique construction time that prior art exists easily stifled, consolidate the not obvious technical problem of waiting of effect, provide a region weak soil foundation reinforced structure of dredger fill, this reinforced structure not only can be fine reach reinforced purpose, simple structure moreover, the construction installation of being convenient for has greatly shortened construction period, can also avoid the drain pipe to become silted up in addition for drainage rate.
The purpose of the utility model is mainly realized by the following scheme:
a soft soil foundation reinforcing structure of a dredger fill area comprises a soft soil foundation, wherein the soft soil foundation comprises a soft soil layer and a dredger fill layer covering the soft soil layer, a first sealing layer is arranged between the soft soil layer and the dredger fill layer, a sand cushion layer is laid on the upper portion of the dredger fill layer, and a second sealing layer is arranged on the upper portion of the sand cushion layer; the soft soil layer upper berth is equipped with first horizontal drain pipe, first horizontal drain pipe is connected with drainage device, beat below the sand cushion and be equipped with vertical drain bar, vertical drain bar bottom is deepened to the soft soil layer, and the wrench end of vertical drain bar is buried in the sand cushion, the second horizontal drain pipe has been laid to the inslot digging groove of sand cushion, the wrench end of second horizontal drain pipe and vertical drain bar meets, and the second horizontal drain pipe is connected with vacuum extractor. The first horizontal drainage pipe is sealed by the first sealing layer, so that clogging caused by entry of dredger fill in later-stage dredger fill operation is prevented, drainage rate is increased, and construction period is shortened; in addition, a good sealing system is formed between the first sealing layer and the second sealing layer, effective vacuum pressure in the vertical drainage plate in the vacuum preloading process can be obviously improved, and the reinforcing effect is improved.
Preferably, the first sealing layer and the second sealing layer respectively comprise woven cloth, geotextile and sealing film which are sequentially laid from bottom to top. The woven cloth can provide certain bearing capacity, so that constructors can walk on the surface, and in addition, sludge can be prevented from entering; the geotextile is used for protecting the sealing film for sealing.
Preferably, the sealing film is made of polyethylene or polyvinyl chloride, the sealing effect is good, and the technical indexes and the performance of the sealing film meet the relevant regulations of the technical regulations for reinforcing soft soil foundations by vacuum preloading.
Preferably, the upper surface of the second sealing layer is provided with a stacking material layer. The heap loading layer exerts pressure to sand bed course and soft soil foundation, and under the effect of evacuating device evacuation simultaneously, further promotes the moisture in the soft soil foundation and discharges.
Preferably, the first horizontal drainage pipe is a criss-cross pipe network, and a plurality of drainage through holes are uniformly distributed on the first horizontal drainage pipe and the second horizontal drainage pipe. The criss-cross pipe network can improve the drainage effect, and the drainage through holes are convenient for drainage and vacuum pumping.
Preferably, the surface of the drainage through hole is coated with a filter membrane, and the filter membrane is made of long-fiber hot-rolled non-woven fabrics. The long-fiber hot-rolled non-woven fabric has water immersion resistance, excellent water seepage performance and accelerated drainage rate.
Preferably, the pumping and drainage device adopts a well point precipitation device. Well point dewatering device is comparatively commonly used in civil engineering, the construction installation of being convenient for.
Preferably, the vertical drainage plates are arranged in a triangular shape or a square shape, and the distance between every two vertical drainage plates is 0.5-1.5 m. The vertical drainage plates are reasonably distributed, and are not easy to deform in the vacuum preloading process.
Preferably, the plate head connecting part of the second horizontal drain pipe and the vertical drain plate is wrapped by non-woven fabrics and is bound and sealed by a binding belt, so that the sealing effect is improved.
Preferably, the vacuum pumping means comprises a vacuum pump and a vacuum check valve between the vacuum pump and the second horizontal drain pipe.
Therefore, the utility model discloses possess following advantage:
(1) the first sealing layer is arranged between the soft soil layer and the hydraulic filling soil layer, and the first horizontal drainage pipe is sealed by the first sealing layer, so that silting caused by the entry of hydraulic filling soil during later hydraulic filling operation is prevented, the drainage rate is accelerated, and the construction period is shortened;
(2) the utility model discloses a good sealing system has been formed between first sealing layer and the second sealing layer, can show the effective vacuum pressure in the vertical drain bar that improves in the vacuum preloading process, improves the reinforcement effect;
(3) in the vacuum preloading process, the water in the dredger fill layer is extruded after the dredger fill layer is pressed, and the extruded water is discharged along the first horizontal drainage pipe through the water pumping and discharging device, so that the water content of the dredger fill layer is quickly reduced, and a preliminary hard roadbed structure is formed in the dredger fill layer;
(4) the surface of the drainage through hole of the utility model is coated with the filter membrane made of the long fiber hot-rolled non-woven fabric, which has water immersion resistance, excellent water seepage performance and quickened drainage speed;
(5) the utility model discloses drainage device and evacuating device cooperate and use, can improve the reinforcement effect of weak soil foundation.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Illustration of the drawings: 1-soft soil foundation, 2-soft soil layer, 3-blowing and filling soil layer, 4-first sealing layer, 5-sand cushion layer, 6-second sealing layer, 7-first horizontal drainage pipe, 8-pumping and drainage device, 9-vertical drainage plate, 10-second horizontal drainage pipe, 11-vacuumizing device, 12-stacking material layer, 13-vacuum pump and 14-vacuum check valve.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a technical scheme, a regional soft soil foundation reinforced structure of dredger fill mainly comprises soft soil foundation 1 and the sand bed course 5 of laying in soft soil foundation 1 upper portion, soft soil foundation 1 comprises soft soil layer 2 and the dredger fill layer 3 that covers on soft soil layer 2, be equipped with first sealing layer 4 between soft soil layer 2 and the dredger fill layer 3, first sealing layer 4 comprises woven fabric, geotechnological cloth and the seal membrane of laying in proper order from bottom to top, the seal membrane adopts the polyvinyl chloride seal membrane in this embodiment; the upper portion of sand bed course 5 is equipped with second sealing layer 6, and second sealing layer 6 comprises woven fabric, geotechnological cloth and the seal membrane of laying in proper order from bottom to top, and the seal membrane adopts the polyvinyl chloride seal membrane in this embodiment, and the upper surface of second sealing layer 6 is provided with and piles up the material layer 12.
A first horizontal drainage pipe 7 is laid on the soft soil layer 2, the first horizontal drainage pipe 7 is a criss-cross pipe network, a plurality of drainage through holes are uniformly distributed on the first horizontal drainage pipe 7, the surfaces of the drainage through holes are wrapped with filter membranes made of long-fiber hot-rolled non-woven fabrics, the first horizontal drainage pipe 7 discharges water out of a reinforced area through a pumping and drainage device 8, and the pumping and drainage device 8 in the embodiment adopts a well point dewatering device which is commonly used in civil engineering; the sand cushion layer is characterized in that vertical drain plates 9 are arranged below the sand cushion layer 5 in a triangular mode, the distance between every two vertical drain plates 9 is 1m, the bottom ends of the vertical drain plates 9 penetrate into the soft soil layer 2, the plate heads of the vertical drain plates 9 are buried in the sand cushion layer 5, second horizontal drain pipes 10 are laid in the sand cushion layer 5 in an excavation mode, a plurality of drainage through holes are evenly distributed on the second horizontal drain pipes 10, filter membranes made of long-fiber hot-binding non-woven fabrics are wrapped on the surfaces of the drainage through holes, the second horizontal drain pipes 10 and the plate heads of the vertical drain plates 9 are wrapped by the non-woven fabrics and are bound and sealed through binding belts, the second horizontal drain pipes 10 are connected with a vacuumizing device 11, and the vacuumizing device 11 is composed of a vacuum pump 13 and a vacuum check valve 14 located between the vacuum pump 13 and the second horizontal drain pipes 10.
The soft soil foundation reinforcing structure in the dredger fill area in the embodiment comprises the following steps in specific implementation:
step S1: leveling an area needing to be reinforced, laying a first horizontal drainage pipe on a soft soil layer, and connecting the first horizontal drainage pipe with a pumping and drainage device;
step S2: laying a first sealing layer on the first horizontal drainage pipe, wherein the first sealing layer is laid according to the sequence of woven cloth, geotextile and sealing film;
step S3: vertically drilling a vertical drainage plate in the soft soil layer, wherein the length of the vertical drainage plate is 15-20m, inserting a bamboo pole or a steel pipe frame in the soft soil layer, firmly binding the bamboo pole or the steel pipe frame with the vertical drainage plate, and reserving the height of the vertical drainage plate to exceed the design standard height of the hydraulic fill layer after hydraulic fill by 0.5-1 m;
step S4: carrying out cofferdam and hydraulic reclamation operation on an area to be hydraulically filled to enable the elevation of a hydraulic fill soil layer to reach a designed elevation value, and paving a sand cushion layer on the hydraulic fill soil layer;
step S5: after the dredger fill is formed, pulling out the bamboo poles or the steel pipe frame, digging grooves on the sand cushion layer and paving a second horizontal drain pipe, wrapping the second horizontal drain pipe and the plate head of the vertical drain plate through non-woven fabrics, binding and sealing the second horizontal drain pipe through a binding belt, and connecting the second horizontal drain pipe with a vacuumizing device;
step S6: laying a second sealing layer on the sand cushion layer, wherein the second sealing layer is laid according to the sequence of the woven cloth, the geotextile and the sealing film;
step S7: starting the pumping drainage device and the vacuumizing device, performing a vacuum preloading process, laying a layer of non-woven fabric on the second sealing layer, piling and loading filling soil and the like on the non-woven fabric as a piling and loading material layer for carrying out piling and loading preloading, and when the effect of reinforcing the soft soil foundation reaches the design requirement, closing the pumping drainage device and the vacuumizing device to finish the vacuum preloading reinforcing process of the soft soil foundation in the dredger fill area.
It should be understood that this example is for illustrative purposes only and is not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

Claims (10)

1. The utility model provides a regional soft soil foundation reinforced structure of dredger fill, includes soft soil foundation (1), its characterized in that: the soft soil foundation (1) comprises a soft soil layer (2) and a blowing and filling soil layer (3) covering the soft soil layer (2), a first sealing layer (4) is arranged between the soft soil layer (2) and the blowing and filling soil layer (3), a sand cushion layer (5) is laid on the upper portion of the blowing and filling soil layer (3), and a second sealing layer (6) is arranged on the upper portion of the sand cushion layer (5); the soft soil layer (2) upper berth is equipped with first horizontal drainage pipe (7), first horizontal drainage pipe (7) are connected with take out drainage device (8), beat below sand bed course (5) and be equipped with vertical drain bar (9), vertical drain bar (9) bottom is deepened to soft soil layer (2), and the plate head of vertical drain bar (9) is buried in sand bed course (5), second horizontal drainage pipe (10) have been laid to the grooving in sand bed course (5), second horizontal drainage pipe (10) meet with the plate head of vertical drain bar (9), and second horizontal drainage pipe (10) are connected with evacuating device (11).
2. The soft soil foundation reinforcing structure in the dredger fill area of claim 1, wherein: the first sealing layer (4) and the second sealing layer (6) respectively comprise woven cloth, geotextile and sealing films which are sequentially laid from bottom to top.
3. The soft soil foundation reinforcing structure in the dredger fill area of claim 2, wherein: the sealing film is made of polyethylene or polyvinyl chloride.
4. The soft soil foundation reinforcing structure in the dredger fill area of claim 3, wherein: and a material stacking layer (12) is arranged on the upper surface of the second sealing layer (6).
5. The soft soil foundation reinforcing structure in the dredger fill area of claim 1, wherein: the first horizontal drainage pipe (7) is a criss-cross pipe network, and a plurality of drainage through holes are uniformly distributed in the first horizontal drainage pipe (7) and the second horizontal drainage pipe (10).
6. A soft soil foundation stabilization structure in a dredger fill area according to claim 5, characterized in that: the surface of the drainage through hole is coated with a filter membrane, and the filter membrane is made of long-fiber hot-rolled non-woven fabrics.
7. The soft soil foundation reinforcing structure in the dredger fill area of claim 1, wherein: the pumping and drainage device (8) adopts a well point dewatering device.
8. The soft soil foundation reinforcing structure in the dredger fill area of claim 1, wherein: the vertical drainage plates (9) are arranged in a triangular shape or a square shape, and the distance between every two vertical drainage plates (9) is 0.5-1.5 m.
9. The soft soil foundation reinforcing structure in the dredger fill area of claim 1, wherein: and the joint of the second horizontal drain pipe (10) and the plate head of the vertical drain plate (9) is wrapped by non-woven fabrics and is bound and sealed by a binding belt.
10. The soft soil foundation reinforcing structure in the dredger fill area of claim 1, wherein: the vacuum pumping device (11) comprises a vacuum pump (13) and a vacuum check valve (14) positioned between the vacuum pump (13) and the second horizontal drainage pipe (10).
CN202020151248.9U 2020-02-03 2020-02-03 Soft soil foundation reinforcing structure in dredger fill area Active CN212001021U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020151248.9U CN212001021U (en) 2020-02-03 2020-02-03 Soft soil foundation reinforcing structure in dredger fill area

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020151248.9U CN212001021U (en) 2020-02-03 2020-02-03 Soft soil foundation reinforcing structure in dredger fill area

Publications (1)

Publication Number Publication Date
CN212001021U true CN212001021U (en) 2020-11-24

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN212001021U (en)

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