CN103669333A - Slide-resistant pile facilitating vacuum rainfall - Google Patents

Abstract

The invention discloses an anti-slide pile which is convenient for vacuum dewatering, and belongs to the field of slope treatment facilities. The anti-slide pile comprises: an anti-slide pile body and a vacuum tube well; the vacuum tube well is arranged in the anti-slide pile body; The middle part of the above-mentioned anti-slide pile body runs through the anti-slide pile body from top to bottom; the top of the vacuum tube well is provided with a suction pipe hole and an air extraction hole; the vacuum tube well adopts a steel casing, and the top of the steel casing is provided with a sealed wellhead. The bottom of the casing is the filter section. The anti-slide pile is equipped with a vacuum tube well in the middle of the anti-slide pile body, which reduces the amount of anti-slide pile concrete without reducing the strength of the pile body. It is simple and easy to operate, and it is an effective engineering measure for controlling side slope and landslide. And because the vacuum tube well is set, the vacuum deep well can dewater and discharge groundwater, which solves the problems of unsatisfactory drainage effect and inconvenient operation of the existing anti-slide piles.

Description

Anti-slide pile for vacuum precipitation

technical field

The invention relates to the field of slope treatment facilities, in particular to an anti-slide pile used in landslide treatment projects in reservoir areas to facilitate vacuum precipitation.

Background technique

Anti-slide pile is an effective engineering measure to control landslides. It is used to stabilize the soil by embedding piles with soil around the pile. Anti-slide piles have been widely used in slope control. Drainage engineering is also an engineering measure to prevent and control landslides, which is divided into surface drainage and underground drainage. The surface drainage project is simple and easy to construct, and the project cost is low. Almost all landslide control projects include surface drainage measures. The groundwater level has a great influence on the stability of the slope. The higher the water level, the lower the safety factor of the slope, which seriously threatens the safety of the slope. Especially in the rainy mountainous areas in the south and the slopes of various large reservoir areas, the seepage of groundwater aggravates the potential landslide hazard of the slopes. Underground drainage works can greatly reduce pore water pressure, increase effective normal stress and improve anti-sliding force, and the reinforcement effect is excellent, but large-scale deep drainage is much more complicated than surface drainage. The anti-slide piles used in the project are generally reinforced concrete structures, which mainly play the role of anchorage and shear resistance. Although the anti-sliding stability of the slope is improved, it has no effect on removing the water in the slope. The closely arranged anti-slide piles also function as cut-off walls to a certain extent, blocking the seepage channel of the water in the slope.

At present, a new type of driven anti-slide pile designed by Peng Hui of Three Gorges University, etc. has a middle hole in the pile body, and the middle hole communicates with the drainage holes distributed on the pile body. When the pile body is driven into the slope soil, the pressure water in the soil can enter the middle hole through the drainage hole and be discharged, which can not only discharge the pressure water in the soil body, but also play the role of anchorage or retaining wall.

Although this anti-sliding pile of the above-mentioned prior art has a drainage function, it can only discharge pressure water in the soil, and the drainage effect is not obvious. Because it is a designed driven anti-slide pile, the length of the pile body is short, the strength is low, and the soil reinforcement is not enough.

Contents of the invention

The technical problem to be solved by the present invention is to provide an anti-slide pile that is convenient for vacuum dewatering. The rapid and repeated rise and fall of the water level in a large reservoir area may cause a large pressure difference between the reservoir water level and the groundwater in the slope, which may easily cause landslide damage. The vacuum precipitation technology can reduce the height difference between the groundwater outside the slope and inside the slope when the water level of the reservoir drops rapidly, thus solving the problem of slope instability caused by the large water pressure difference between the inside and outside of the slope during rapid precipitation.

The invention provides an anti-slide pile that is convenient for vacuum precipitation, comprising:

Anti-slide piles and vacuum tube wells;

The vacuum tube well is arranged in the body of the anti-slide pile;

The vacuum tube well is arranged in the middle of the anti-slide pile body, and penetrates the anti-slide pile body from top to bottom;

The top of the vacuum tube well is provided with a suction pipe hole and a suction hole;

The vacuum tube well adopts a steel casing, the top of the steel casing is provided with a sealed wellhead, and the bottom of the steel casing is a water filtration section.

The beneficial effects of the present invention are: a vacuum tube well is arranged in the middle of the anti-slide pile body, and the amount of concrete used for the anti-slide pile is reduced without reducing the strength of the pile body. Solid, simple construction and easy operation, it is an effective engineering measure to control slopes and landslides. And because the vacuum tube well is set, the vacuum deep well can dewater and discharge groundwater, which solves the problems of unsatisfactory drainage effect and inconvenient operation of the existing anti-slide piles.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative work.

Fig. 1 is the structural representation of the anti-slide pile that the embodiment of the present invention provides;

Fig. 2 is the sectional schematic diagram of the anti-slide pile body of A-A in Fig. 1;

Fig. 3 is a schematic diagram of the wellhead sealing structure provided by the embodiment of the present invention;

Fig. 4 is a schematic diagram of the flange orifice layout of the wellhead seal provided by the embodiment of the present invention;

Fig. 5 is the sectional view of the water filtering section of the anti-slide pile body of B-B in Fig. 1;

Fig. 6 is a schematic diagram of anti-slide piles arranged on a bank slope according to an embodiment of the present invention.

Detailed ways

The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Figures 1 and 3 show that the embodiment of the present invention provides an anti-slide pile that is convenient for vacuum precipitation. It is an anti-slide pile facility that is convenient for drainage in slope treatment. The anti-slide pile includes: an anti-slide pile body 1 and a vacuum tube well 2;

Wherein, the anti-slide pile body 1 is provided with a vacuum tube well 2;

The vacuum tube well 2 is arranged in the middle of the anti-slide pile body 1, and runs through the anti-slide pile body 1 from top to bottom;

The top of the vacuum tube well 2 is provided with a suction pipe hole 14 and an air extraction hole 15;

The vacuum tube well 2 adopts a steel casing, the top of the steel casing is provided with a sealed wellhead 21, and the bottom of the steel casing is a water filtration section 22. The sealing well head 21 is set to form a well chamber with a sealed structure in the vacuum tube well 2, which is convenient for realizing vacuum dewatering.

As shown in Figure 2, the structure of the anti-slide pile body 1 of the above-mentioned anti-slide pile is square, and the pile body 10 formed by filling concrete with the reinforcement cage 11 outside the vacuum tube well, and the water filter section arranged at the bottom of the pile body 10 12 and the enlarged pile head 13 that is arranged on the bottom end of the filter section constitutes; the position of the filter section 12 corresponds to the position of the filter section 22 of the vacuum tube well 2.

As shown in Figures 3 and 4, in the above-mentioned anti-slide pile, the structure of the sealed wellhead 21 of the vacuum tube well 2 is composed of a sealing sleeve 211 set on the top of the steel casing and a flange 212 arranged on the sealing sleeve;

The water suction pipe hole 14 and the air suction hole 15 are arranged on the flange 212 . Specifically, the water suction pipe hole 14 can be composed of three through holes, one is a through hole for the water suction pipe to pass through, and the other two are the water pump cable hole 16 and the hoisting iron wire hole 17 (see FIG. 4 ).

As shown in Figure 5, in the above-mentioned anti-slide pile, the water filter section 22 of the vacuum tube well 2 is as follows: a plurality of through holes are set on the bottom section of the steel casing, and each through hole is connected to a plastic pipe 221 to connect, and the plastic pipe 221 passes out to the outside of the anti-slide pile body 1, and can contact with the soil layer outside the anti-slide pile body, and the pipe head of the plastic pipe 221 is provided with a filter screen. Wherein, the plastic pipe 221 adopts a thin PVC plastic pipe with an outer diameter of 10mm; the filter screen provided on the pipe head of the plastic pipe 221 is a layer of 80-mesh filter screen. It can prevent soil from entering the plastic pipe and blocking the pipe body.

In the above-mentioned anti-slide pile, the water filter section 12 of the anti-slide pile body is coated with a coarse sand layer to facilitate water penetration.

As shown in Figure 1, the above-mentioned anti-slide pile also includes: a vacuum pumping device 3 and a water pumping device 4; wherein, the suction pipe of the vacuum pumping device 3 communicates with the vacuum tube well 2; the water pumping device 4 is arranged in the vacuum tube well 2, and the pumping device The suction pipe of 2 stretches out outside the vacuum tube well. Preferably, the vacuum device 3 can adopt a direct-connected water ring vacuum pump. The pumping device 4 can adopt a deep well submersible pump, which is arranged at the bottom of the vacuum tube well.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

An embodiment of the present invention provides an anti-slide pile, which is an anti-slide pile embedded with a vacuum tube well. The vacuum tube well in the sliding pile body, the anti-sliding pile body includes the pile body and the enlarged pile head at the bottom of the pile. There is a vacuum tube well inside the pile body. The vacuum tube well is made of steel casing. The upper part of the steel casing is a sealed wellhead, and the lower part is a water filtration section. The sealed wellhead is composed of a seamless steel pipe sealing sleeve and a flange (the upper flange as the sealing cover and the lower flange set on the sealing sleeve), and is sealed in the way of "flange + sealing sleeve". The water filter section is to drill a number of small through holes on the circumference of the steel casing, and each through hole is connected with a plastic pipe (the plastic pipe is a thin PVC plastic pipe with an outer diameter of 10mm), and the plastic pipe passes through the anti-sliding pile body In contact with the soil layer around the pile, in order to prevent the soil from being blocked, the pipe head of the plastic pipe is wrapped with a layer of 80-mesh filter. Further, vacuum pumping device and water pumping device can also be provided to cooperate with the vacuum tube well to form a vacuum dewatering system.

Since the anti-slide pile is equipped with a vacuum tube well in the pile body, and the lower part of the well body is connected with the soil layer around the pile, it realizes the use of vacuum deep well dewatering technology to reduce the groundwater level of the slope on the basis of resisting the slide of the slope soil. It can also solve the problem of reducing the residual water at the interface between the aquitard and the aquifer that cannot be achieved by other precipitation methods, greatly reduce the pore water pressure of the slope soil layer, and improve the slope stability safety factor.

Each part of the above-mentioned anti-slide pile will be described respectively below in conjunction with the accompanying drawings.

(1) Anti-slide pile structure:

The anti-slide pile body is composed of a pile body with a vacuum tube well inside, an enlarged pile head at the bottom of the pile, and coarse sand surrounded by the filter section. The cross-sectional size of the pile body is 1.6m×1.2m. The length of the anti-sliding pile body is generally determined by the bottom of the pile touching the bedrock or the relatively hard soil layer. It needs to pass through the potential slip surface of the slope. After the hole is manually dug, the steel cage is bound, and a radius of 200mm is fixed in the middle. Steel pipes with the same depth are used as downcomer wells, and then concrete is poured while lifting the retaining formwork to make anti-slide piles.

(11) Pile bottom expansion head:

The hole is dug deep to the design hole depth, which is generally stable bedrock. The bottom of the hole is cleaned to expand the pile head, and the bottom is sealed with higher-grade concrete for 15 to 20 cm. The medium-hole tube well is located on the bottom cover. The effect of enlarging the pile head is to increase the anchoring force of the anti-slide pile to the soil.

(12) Coarse sand is surrounded outside the filter section pile:

The bottom of the vacuum tube well is the water filter section, and the thin PVC tube passes through the anti-slide pile and contacts the surrounding soil to form a water filter channel. In order to increase the water filter area, when pouring the pile head and pile bottom section, press it Put in the coarse sand, and pour the concrete while lifting the formwork. Finally, the bottom section of the pile is surrounded by a circle of coarse sand, so that groundwater can easily flow into the negative pressure zone of the vacuum tube well.

The water filter section at the bottom of the pile body is different according to the position of different piles. The water filter section is set above the potential slip surface of the bank slope, so that the groundwater dropped by the vacuum deep well dewatering system comes from the slope above the slip surface. The form of the potential slip surface of the bank slope is analyzed and determined by the limit analysis upper limit method.

(13) pile body:

The design of the pile body is carried out in accordance with the requirements of the "Code for Design of Anti-slide Pile", so that it has a certain bending strength and can meet the function of improving the stability coefficient of the landslide body. In this design, the cross-sectional size of the pile body is 1600mm×1200mm.

(2) Vacuum tube well:

The vacuum tube well is composed of a sealed wellhead on the upper part of the well body, a well chamber, a drilled water filter section at the lower part of the well body, a thin PVC plastic tube passing through the lower part of the pile body, an air extraction device and a water pumping device. The difference between it and the tube well dewatering device is that the sealing and The vacuum device uses the vacuum pump to generate negative pressure in the sealed tube well to accelerate the discharge of groundwater. At the same time, the vacuum negative pressure can also exert force on the groundwater in the soil layer with poor permeability to drain the groundwater.

(21) Wellhead design:

The wellhead of the vacuum tube well shall be strictly sealed: the wellhead shall be closed by the method of "flange + sealing sleeve". The sealing sleeve 211 is set outside the well pipe 2, the length of the sealing sleeve 211 is 0.5m～1.0m, and the connection mode with the steel casing 2 is welding, and then it is sealed with a finer cement slurry. The upper flange 212 is a 15mm thick steel plate, on which a water pump cable hole 16, a water suction pipe hole 14, a pump wire hole 17 and an air extraction hole 15 are provided. Make a well chamber at the head of the anti-slide pile for placing the air extraction device, water pumping device and pipelines.

(22) Bore filter section:

The lower part of the steel pipe used as the tube well is drilled to make the water filter section of the vacuum tube well, and the length of the water filter section is 25% to 50% of the well body. Drill holes along the circumference of the steel pipe. The diameter of the drill hole is the outer diameter of the PVC plastic thin pipe 10mm. Insert one end of the PVC pipe into the pipe well, and wrap the other end with an 80-mesh filter to prevent soil particles from entering the pipe to block the water flow. The PVC pipe extends to the excavated The hole wall soil layer of the pile hole is in contact with the coarse sand arranged around the pile to form a groundwater seepage channel.

(3) Precipitation system:

The well chamber of the vacuum tube well cooperates with the pumping device, air pumping device and pipeline to form a dewatering system. The well chamber is a small chamber set on the top of the anti-slide pile for storing various devices and pipelines of the vacuum tube well system to protect the wellhead Seal the flange device so as not to be damaged and cause air leakage. The key to vacuum deep well dewatering technology is good sealing performance. Practice has proved that the vacuum degree is most suitable at -0.04~-0.06MPa. The air extraction device uses a direct-connected water ring vacuum pump. The pumping equipment is a deep well submersible pump with a head greater than 15m. The water output is selected according to the groundwater drawdown and the calculated displacement.

The deep well submersible pump is hoisted by steel wires, and the upper flange is correspondingly provided with a suction pipe hole, a water pump cable hole and a steel wire hole for the pump, and the submersible pump is connected to the power supply on the ground through the cable. The upper flange is also provided with air extraction holes connected to the vacuum pump, and all holes must be treated with hemp rope or asphalt after passing through the lines or pipelines to ensure strict sealing.

The arrangement of the anti-slide piles 60 of the present invention on the shore is shown in FIG. 6 , wherein, 61 marks a potential slip surface, 62 marks a bank slope, and 63 marks a water level infiltration line.

The beneficial effects of the present invention are: by leaving a middle hole in the middle of the anti-sliding pile body and setting a vacuum tube well, the amount of concrete used for the anti-sliding pile is reduced without reducing the strength of the pile body, and the pile body is manually dug and cast-in-place. The construction is simple and easy to operate, and it is an effective engineering measure to control slope landslides; the vacuum tube well used for dewatering can efficiently discharge groundwater, making up for the unsatisfactory effect of using drainage corridors and vertical drilling for pumping and dewatering, and the actual operation is more difficult. Insufficient, it has a very good effect on the control of side slopes in the reservoir area and mountain slopes with more precipitation. The dewatering system of the vacuum tube well is assembled and manufactured on site, and the extracted water can be used for farmland irrigation or discharged into the reservoir, greatly reducing the waste of water resources.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technical field can easily conceive of changes or changes within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1. An anti-slide pile convenient to vacuum precipitation, comprising:

the anti-slide pile body and the vacuum tube well;

the vacuum tube well is arranged in the anti-slide pile body;

the vacuum tube well is arranged in the middle of the slide-resistant pile body and penetrates through the slide-resistant pile body from top to bottom;

the top end of the vacuum tube well is provided with a water pumping tube hole and an air pumping hole;

the vacuum tube well adopts a steel sleeve, a sealing well mouth is arranged at the top end of the steel sleeve, and a water filtering section is arranged at the bottom of the steel sleeve.

2. The slide-resistant pile facilitating vacuum precipitation as claimed in claim 1, wherein the sealed wellhead is composed of a sealing sleeve sleeved on the top end of the steel sleeve and a flange arranged on the sealing sleeve;

the pumping pipe hole and the air suction hole are arranged on the flange.

3. The anti-slide pile facilitating vacuum precipitation of claim 1, wherein the water filtering section is: a plurality of through holes are formed in one section of the pipe body at the bottom of the steel sleeve, each through hole is connected with a plastic pipe respectively, the plastic pipes penetrate out of the anti-slide pile body and can be in contact with the soil layer outside the anti-slide pile body, and the pipe heads of the plastic pipes are provided with filter screens.

4. An anti-slide pile facilitating vacuum precipitation according to claim 3, characterised in that the outer diameter of the plastic tube is 10 mm;

the filter screen arranged at the tube head of the plastic tube is a 80-mesh filter screen.

5. The slide-resistant pile convenient for vacuum precipitation as claimed in claim 1, wherein the slide-resistant pile body is square and is composed of a pile body formed by filling concrete into a reinforcement cage sleeved outside the vacuum tube well, a water filtering section arranged at the bottom end of the pile body and an enlarged pile head arranged at the bottom end of the water filtering section;

the position of the water filtering section corresponds to the position of the water filtering section of the vacuum tube well.

6. The slide-resistant pile facilitating vacuum precipitation as claimed in any one of claims 4, wherein the drainage section of the slide-resistant pile body is externally coated with a coarse sand layer.

7. The stake of any one of claims 1 to 6, further comprising: a vacuum pumping device and a water pumping device; wherein,

an exhaust pipe of the vacuum pumping device is communicated with the vacuum pipe well;

the water pumping device is arranged in the vacuum tube well, and a water pumping pipe of the water pumping device extends out of the vacuum tube well.

8. The anti-slide pile for facilitating vacuum precipitation of claim 7, wherein the vacuum pumping device is a direct-connected water ring vacuum pump.

9. The slide-resistant pile for vacuum precipitation as claimed in claim 8, wherein said pumping device is a deep well submersible pump and is disposed at the bottom of said vacuum tube well.

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