Vacuum preloading system based on reverse pumping and reverse vacuum preloading treatment method

Abstract

The application discloses a vacuum preloading system based on reverse pumping and draining, which comprises a vacuum pump, a horizontal pumping and draining pipeline, reverse vertical drainage plates and a sealing system, the reverse vertical drainage plates are vertically distributed in silt soil, the vacuum pump is connected with the horizontal pumping and draining pipeline, the horizontal pumping and draining pipeline is connected with the reverse vertical drainage plates densely arranged in the soil body respectively, and the upper surface of the silt soil is paved with the sealing system; the lower end of the reverse vertical drainage plate is connected with the horizontal pumping and draining pipeline above through a branch pipeline. The application further discloses a method for reverse vacuum preloading treatment by using the vacuum preloading system based on reverse pumping and draining. The system can more fully pump and drain the moisture at the bottom of the reverse vertical drainage plate, and the moisture content of the part of the drainage plate penetrating into the soil body is larger, so that the pumping and draining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a vacuum preloading system based on reverse pumping. BACKGROUND

[0002] In the traditional vacuum preloading method, vertical drainage plates are commonly used. Since the pumping end of the vertical drainage plate is located at the upper part, the vacuum degree along the depth direction of the vertical drainage plate decays, which often leads to poor treatment effect on the bottom soil, and finally makes the overall soil reinforcement effect uneven. In addition, the vertical drainage plate will also bend greatly with the settlement of the soil, resulting in a decrease in the effective drainage area, and the fine particles in the soil will easily migrate and block the filter membrane pores, causing the drainage plate to be blocked, and continuously gathering near the surface drainage plate to form a soil column with poor permeability, which seriously slows down the overall drainage rate. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a vacuum preloading system based on reverse pumping, which can more fully pump the water at the bottom of the reverse vertical drainage plate. The technical problem to be solved by the present application also includes providing a method for vacuum preloading treatment using the above-mentioned vacuum preloading system based on reverse pumping.

[0004] To this end, the vacuum preloading system based on reverse pumping provided by the present application comprises a vacuum pump, a horizontal pumping pipeline, a reverse vertical drainage plate and a sealing system, the reverse vertical drainage plate is vertically distributed in the muddy soil, the vacuum pump is connected to the horizontal pumping pipeline, the horizontal pumping pipeline is connected to the reverse vertical drainage plate densely distributed in the soil body, and the upper surface of the muddy soil is paved with the sealing system; characterized in that: the lower end of the reverse vertical drainage plate is connected to the horizontal pumping pipeline above through a branch pipeline.

[0005] Preferably, the branch pipeline is a pipeline formed separately outside the reverse vertical drainage plate, and the branch pipeline and the reverse vertical drainage plate are connected by a sealing joint.

[0006] Preferably, the branch pipeline is located on the reverse vertical drainage plate, the branch pipeline has a branch pumping end at the upper end of the reverse vertical drainage plate, the side wall of the branch pipeline is closed and the lower end is communicated with the main channel of the reverse vertical drainage plate, the branch pipeline and the main pipeline are integrally formed and integrated in the reverse vertical drainage plate, the position corresponding to the main channel of the reverse vertical drainage plate is densely provided with filter holes, and the branch pumping end is connected to the horizontal pumping pipeline.

[0007] Preferably, the branch pipe and the main channel are both opened at the bottom of the reverse vertical drainage plate, and the bottom of the reverse vertical drainage plate is provided with a sleeve head with a water guide cavity therein, which is connected with the lower end of the branch pipe and the lower end of the main pipe.

[0008] Preferably, the reverse vertical drainage plates and the forward vertical drainage plates are distributed in sequence and are spaced apart, and the forward vertical drainage plates are provided with forward connecting ends which are opened at the upper ends and are connected with the transverse drainage pipe through pipes.

[0009] Preferably, the reverse vertical drainage plates are embedded in the soil, and a soil sealing layer is arranged between the upper end of the reverse vertical drainage plate and the external atmosphere, and the soil sealing layer constitutes the sealing system.

[0010] The application also provides a method for reverse vacuum preloading treatment by using the reverse drainage based vacuum preloading system, and the method comprises the following steps:

[0011] 1) embedding the reverse vertical drainage plates in the soil, and connecting the lower end of the transverse drainage pipe to the branch pipe of the reverse vertical drainage plate and the upper end to the vacuum pump;

[0012] 2) laying the geotextile and the sealing film on the soil to form a sealing system;

[0013] 3) starting the vacuum pump to perform drainage, and first draining the water in the lower part of the reverse vertical drainage plate, and then gradually moving the drainage area upward when the lower part of the reverse vertical drainage plate is blocked.

[0014] Preferably, the branch pipe is arranged on the reverse vertical drainage plate, and the branch pipe is provided with a branch drainage end at the upper end of the reverse vertical drainage plate, the side wall of the branch pipe is closed, the lower end of the branch pipe is communicated with the main channel of the reverse vertical drainage plate, and the reverse vertical drainage plate is densely provided with filter holes at the position corresponding to the main channel.

[0015] Preferably, the reverse vertical drainage plates and the forward vertical drainage plates are distributed in sequence and are spaced apart, the forward vertical drainage plates are provided with forward connecting ends which are opened at the upper ends and are connected with the transverse drainage pipe through pipes, and the vacuum pump is started to perform drainage in the step 3) while the reverse vertical drainage plates and the forward vertical drainage plates are drained.

[0016] The technical effects of the application are as follows:

[0017] 1) The reverse pumping and draining structure and method of the present application can solve the problem of vacuum decay along the depth direction of the vertical drainage plate in the traditional vertical drainage structure. When reverse pumping and draining, the vacuum is transmitted from bottom to top, reaching the strongest at the bottom, so the pumping and draining effect on the bottom soil is the best. The water content in the bottom of the foundation treatment is the largest, and it is most needed to be pumped and drained, so this structure can fully solve the problem of bottom pumping and draining, and can improve the overall efficiency of foundation treatment.

[0018] 2) In the present application, the branch pipe is directly arranged on the reverse vertical drainage plate, the branch pipe is in communication with the main channel at the bottom, and the transverse pumping and draining pipe can be directly connected and communicated with the branch pumping and draining end at the top of the reverse vertical drainage plate, which makes the operation of reverse pumping and draining more convenient, avoids the bending of external connecting pipes due to deep penetration into the soil, and is beneficial to ensuring the smoothness of the pumping and draining channel.

[0019] 4) In the present application, the reverse vertical drainage plate and the forward vertical drainage plate are distributed in sequence and at intervals. When starting the vacuum pump for pumping and draining, the pumping and draining force of the reverse vertical drainage plate on the lower part of the soil and the pumping and draining force of the forward vertical drainage plate on the upper part of the soil can be considered, and the upper and lower parts can be pumped and drained at the same time, which can greatly improve the pumping and draining efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure cross-sectional view of the pipe system of the vacuum preloading system based on reverse pumping and draining provided for embodiment 1 of the present application.

[0021] Figure 2 The three-dimensional structure schematic view of the vacuum preloading system based on reverse pumping and draining provided for embodiment 1 of the present application.

[0022] Figure 3 The three-dimensional structure schematic view of the vacuum preloading system based on reverse pumping and draining provided for embodiment 2 of the present application.

[0023] Figure 4 The three-dimensional structure schematic view of the vacuum preloading system based on reverse pumping and draining provided for embodiment 3 of the present application.

[0024] Figure 5 The structure cross-sectional view of the reverse vertical drainage plate in Figure 4 .

[0025] Figure 6 The enlarged schematic view of A in Figure 5 . DETAILED DESCRIPTION

[0026] The application will be further described in detail below with reference to the accompanying drawings and examples. Identical parts are denoted by identical reference numerals. It should be noted that the words "front", "back", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part.

[0027] Referring to Figures 1-2 As shown in the drawings, the reverse drainage-based vacuum preloading system provided by the embodiment 1 of the application comprises a vacuum pump 1, a horizontal drainage pipeline 2, reverse vertical drainage plates 3 and a sealing system 4. The reverse vertical drainage plates 3 are vertically distributed in the silt soil. The vacuum pump 1 is connected to the horizontal drainage pipeline 2. The horizontal drainage pipeline 2 is connected to the reverse vertical drainage plates 3 which are densely arranged in the soil. The upper surface of the silt soil is paved with the sealing system 4. The sealing system 4 has two constitutions. One is constituted by geotextile and sealing film. The other is that the reverse vertical drainage plates are buried in the soil. The upper end of the reverse vertical drainage plates is blocked by a soil sealing layer from the outside atmosphere. The soil sealing layer constitutes the sealing system alone. The use of silt soil sealing can save the use of conventional sealing systems such as geotextile and sealing film. The lower end of the reverse vertical drainage plates 3 is connected to the horizontal drainage pipeline 2 above by a branch pipeline 21 and a sealing joint 5.

[0028] The application also provides a reverse vacuum preloading method using the reverse drainage-based vacuum preloading system. The method comprises the following steps:

[0029] 1) The reverse vertical drainage plates 3 are buried in the soil. The lower end of the horizontal drainage pipeline 2 is connected to the branch pipeline 21 of the reverse vertical drainage plates 3. The upper end is connected to the vacuum pump 1.

[0030] 2) The geotextile and sealing film are paved on the soil to form the sealing system 4.

[0031] 3) The vacuum pump 1 is started to perform drainage. The water in the lower part of the reverse vertical drainage plates 3 is drained first. When the lower part of the reverse vertical drainage plates 3 is blocked, the drainage area is gradually moved upward.

[0032] Referring to Figure 3 As shown in the drawings, the embodiment 2 of the application is basically the same as the embodiment 1. The difference is that the reverse vertical drainage plates 3 and the forward vertical drainage plates 6 are distributed one by one and spaced apart. The forward vertical drainage plates 6 have forward connecting ends which are opened at the upper end. The forward connecting ends of the forward vertical drainage plates 6 are above the soil. The forward connecting ends are connected to the horizontal drainage pipeline 2 by a pipeline. The sealing system 4 of the embodiment is constituted by the soil film and the geotextile which are arranged on the upper surface of the soil. In the step 3), the vacuum pump 1 is started to perform drainage. The reverse vertical drainage plates 3 and the forward vertical drainage plates 4 are drained at the same time.

[0033] Referring to Figures 4-6 As shown in FIG. 3, the embodiment 3 of the present application is basically the same as the embodiment 1, the difference is that the branch pipe 21 is on the reverse vertical drainage plate 3, the branch pipe 21 has a branch pipe extraction end 211 at the upper end of the reverse vertical drainage plate 3, the side wall of the branch pipe 21 is closed and the lower end is communicated with the main channel 31 of the reverse vertical drainage plate 3, the branch pipe 21 and the main channel 31 are integrally formed and integrated in the reverse vertical drainage plate, the reverse vertical drainage plate 3 is densely provided with filter holes 32 at the position corresponding to the main channel 31, and the branch pipe extraction end 211 is connected with the transverse extraction pipe 2. The branch pipe 21 and the main channel 31 are both opened at the bottom of the reverse vertical drainage plate, the reverse vertical drainage plate is provided with a sleeve head 7 at the bottom, the sleeve head 7 is sealed at the bottom of the reverse vertical drainage plate 3, the sleeve head 7 has a water guide cavity 71, and the water guide cavity 71 is communicated with the lower end of the branch pipe and the lower end of the main channel.

[0034] When the reverse vertical drainage plate 3 is blocked, the transverse extraction pipe 2 can be connected with a pressure filling pump to start the pressure filling pump to fill the reverse vertical drainage plate 3, thereby helping to dredge the blocked place.

[0035] The above is only the preferred embodiment of the present application, the protection scope of the present application is not limited to the above-mentioned embodiments, any technical solution under the idea of the present application is within the protection scope of the present application. It should be pointed out that for ordinary skilled in the art, some improvements and decorations without departing from the principle of the present application, these improvements and decorations should also be considered as the protection scope of the present application.

Claims

1. A vacuum preloading system based on reverse pumping, characterized in that: The invention relates to a vacuum pumping system, which comprises a vacuum pump, a transverse pumping pipe, a reverse vertical drainage plate and a sealing system, wherein the reverse vertical drainage plate is vertically distributed in the silt soil, the vacuum pump is connected to the transverse pumping pipe, the transverse pumping pipe is connected to the reverse vertical drainage plate, and the sealing system is arranged on the surface of the silt soil. The lower end of the reverse vertical drainage plate is connected to the transverse pumping pipe through a branch pipe. The branch pipe is a pipe formed separately from the reverse vertical drainage plate. The branch pipe is arranged on the reverse vertical drainage plate.

2. The vacuum preloading system based on reverse pumping according to claim 1, characterized in that: The branch pipe is connected to the transverse pumping pipe through a branch pumping end.

3. The vacuum preloading system based on reverse pumping according to claim 1, characterized in that: The reverse vertical drainage plate and the forward vertical drainage plate are arranged alternately.

4. A method for reverse vacuum preloading treatment using the reverse vacuum preloading system according to claim 1, characterized in that: The reverse vertical drainage plate and the forward vertical drainage plate are pumped simultaneously. The reverse vertical drainage plate and the forward vertical drainage plate are arranged alternately. The reverse vertical drainage plate and the forward vertical drainage plate are pumped simultaneously. ​ 5. The method of reverse vacuum preloading according to claim 4, wherein: ​ 6. A method of reverse vacuum preloading according to claim 4 or 5, characterised in that: ​

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