Construction method for dewatering through pile sinking hole

Abstract

The invention discloses a construction method for dewatering by using a pile sinking hole, which comprises the following steps of: welding a plurality of sections of porous filter pipes, sealing the bottoms of the porous filter pipes, and winding the filter pipes by using dense-mesh gauze; a precipitation point location is selected according to the static pressure pile sinking condition in the site, after a pile sinking machine completes pile sinking of the point location, a pile feeder is pulled out to form a pile sinking hole, and at the moment, the prepared porous filter pipe is sunk into the pile sinking hole; filling a gap between the porous filter pipe and the pile sinking hole with fine sand stones and compacting the fine sand stones; the vacuum water suction pump and the water pipe are sunk into the porous filter pipe together, the top of the porous filter pipe is sealed, vacuumizing is started, after certain negative pressure is formed in the well, water in surrounding soil naturally converges into the porous filter pipe, vacuum precipitation is formed at the moment, the well digging construction procedure is omitted, and the construction period is shorter.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and more particularly to a construction method for lowering water levels by utilizing pile sinking holes. Background Art

[0002] Traditional foundation pit projects require the construction of a large number of drainage wells before excavating the soil, and the lowering of porous filter pipes and other sand and gravel materials. The depth of the drainage wells is generally much deeper than the depth of the foundation pit, the overall cost is high, and the time required to construct the drainage wells is long. For projects with limited site area, on-site well construction often interferes with and affects the construction of adjacent processes in the surrounding areas, resulting in high costs for auxiliary construction measures and long construction periods. Summary of the Invention

[0003] In view of the problems existing in the prior art, the purpose of the present invention is to provide a construction method for dewatering by using pile sinking holes, which eliminates the well drilling construction process and shortens the construction period.

[0004] The present invention adopts the following technical solutions:

[0005] A construction method for dewatering by using pile sinking holes comprises the following steps:

[0006] Step S1: welding the multi-section porous filter tube, sealing the bottom of the porous filter tube, and wrapping the filter tube with dense mesh gauze;

[0007] Step S2: For static pressure pile sinking within the site selected precipitation point, wait for the pile driver to complete the pile sinking point, pull out the pile sender to form a pile hole, then the porous filter tube prepared above is sunk into the pile hole;

[0008] Step S3: Fill the gap between the porous filter tube and the pile hole with fine sand and gravel and compact it;

[0009] Step S4: sink the vacuum water pump together with the water pipe into the porous filter tube, seal the top of the porous filter tube, and start vacuuming. After a certain negative pressure is formed in the well, the water in the surrounding soil naturally gathers in the porous filter tube, and vacuum precipitation is formed at this time.

[0010] Beneficial effects

[0011] Compared with the traditional construction method of drilling new drainage wells on the ground, the method of using pile sinking holes to dewater can directly avoid the well drilling construction process, shorten the construction period and reduce costs.

[0012] The method of using pile sinking holes for dewatering in the present invention makes it more flexible to select the dewatering points, and the pile sinking holes can be selected nearby according to the dewatering well points. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of a porous filter tube according to an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the construction of prefabricated pipe piles according to an embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of inserting a porous filter tube according to an embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of vacuum water pumping according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] As shown in the figure, the present invention discloses a construction method for dewatering by using pile sinking holes, comprising the following steps:

[0019] Step S1: welding multiple short sections of porous filter tubes 1 to form a porous filter tube 1 of a target length, sealing the bottom of the porous filter tube 1, and wrapping the filter tube with dense gauze; the dense gauze serves to isolate the soil.

[0020] Step S2: For static pressure pile driving within the site selected precipitation point, after the pile driver 2 completes the pile driving at the point, pull out the pile driver to form a pile hole 3, then the porous filter tube 1 prepared above is sunk into the pile hole 3;

[0021] Step S3: Fill the gap between the porous filter tube 1 and the pile hole 3 with fine sand and gravel and compact it to protect the porous filter tube 1. At the same time, the fine sand and gravel can also isolate the soil.

[0022] Step S4: The vacuum pump and the water pipe are lowered into the porous filter tube 1, and the top of the porous filter tube 1 is sealed. Vacuuming begins. Once a certain negative pressure is formed in the well, the water in the surrounding soil naturally converges into the porous filter tube 1, forming vacuum precipitation. The present invention utilizes negative pressure to pump water and achieve the goal of precipitation, and the entire construction does not require well drilling.

[0023] In one embodiment of the present invention, in step S1 , the distance H between the bottom of the porous filter tube 1 and the first filter hole 11 is not less than 2 m.

[0024] In one embodiment of the present invention, in step S1, three layers of dense gauze are wrapped around the outside of the porous filter tube 1. The more layers of gauze, the better the isolation can be achieved, preventing fine sand and soil from entering the porous filter tube 1.

[0025] In one embodiment of the present invention, in step S2, after the pile driver is pulled out and a pile hole 3 is naturally formed at the pile position, the porous filter tube 1 that is welded and wrapped with gauze is lowered from the pile hole 3 to the top of the pile.

[0026] In one embodiment of the present invention, after step S3, the static pile driver moves to perform the next pile sinking construction. The present invention can utilize multiple porous filter pipes 1 to pump water simultaneously.

[0027] In one embodiment of the present invention, the top of the porous filter tube 1 is higher than the ground 5, which facilitates the extraction of water while preventing soil on the ground from entering the porous filter tube 1.

[0028] In one embodiment of the present invention, a steel plate 4 is used to fully weld and seal the bottom of the porous filter tube 1 to prevent soil and water from entering from the bottom of the porous filter tube 1 .

[0029] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A construction method for dewatering by using pile sinking holes, characterized by: The following steps are involved: Step S1: welding the multi-section porous filter tube, sealing the bottom of the porous filter tube, and wrapping the filter tube with dense mesh gauze; Step S2: For static pressure pile sinking within the site selected precipitation point, wait for the pile driver to complete the pile sinking point, pull out the pile sender to form a pile hole, then the porous filter tube prepared above is sunk into the pile hole; Step S3: Fill the gap between the porous filter tube and the pile hole with fine sand and gravel and compact it; Step S4: sink the vacuum water pump together with the water pipe into the porous filter tube, seal the top of the porous filter tube, and start vacuuming. After a certain negative pressure is formed in the well, the water in the surrounding soil naturally gathers in the porous filter tube, and vacuum precipitation is formed at this time.

2. The construction method for dewatering by using pile sinking holes according to claim 1, characterized in that: In step S1, the distance between the bottom of the porous filter tube and the first filter hole is not less than 2m.

3. The construction method for dewatering by using pile sinking holes according to claim 1, characterized in that: In step S1, three layers of dense gauze are wrapped around the outside of the porous filter tube.

4. The construction method for dewatering by using pile sinking holes according to claim 1, characterized in that: In step S2, after the pile driver is pulled out and a pile hole is naturally formed at the pile position, the porous filter tube that has been welded and wrapped with gauze is lowered from the pile hole to the top of the pile.

5. The construction method for dewatering by using pile sinking holes according to claim 1, characterized in that: After step S3, the static pile driver moves to carry out the pile sinking construction of the next pipe pile.

6. The construction method for dewatering by using pile sinking holes according to claim 1, characterized in that: The top of the porous filter tube is above the ground.

7. The construction method for dewatering by using pile sinking holes according to claim 1, characterized in that: The bottom of the porous filter tube is fully sealed with a steel plate.

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