Temporary dewatering method for high-fill pile foundation area

Abstract

The invention provides a temporary precipitation method for a high-fill pile foundation area, which belongs to the technical field of building construction, and comprises the following steps: dividing the pile foundation area, forming a temporary catchment precipitation service area, selecting a temporary precipitation pile hole site in the temporary catchment precipitation service area, and drilling at the temporary precipitation pile hole site to obtain a temporary precipitation pile hole. Whether the temporary catchment precipitation service area needs precipitation is judged according to the depth of temporary catchment water in the temporary precipitation pile hole within the first catchment time, if precipitation is needed, a preset filtering reinforcement cage is installed in the temporary precipitation pile hole, and water pumping equipment is lowered to the preset height in the filtering reinforcement cage so that precipitation can be conducted on the temporary precipitation pile hole; the whole process does not need extra precipitation well construction, so that the cost is saved; the engineering pile also serves as a temporary precipitation pile, the pile body of the engineering pile can be poured after temporary precipitation is completed, secondary pipe lifting, cage descending and other work are not needed, the construction efficiency is improved, and the construction period is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and more specifically, to a temporary dewatering method for a high fill pile foundation area. Background Art

[0002] High fill is formed by backfilling in layers manually or mechanically, and after being processed by strong tamping, vibration rolling, impact compaction and other technical means, the filling thickness is greater than 20 meters. In mountainous areas such as Yunnan, Guizhou, Sichuan, and Chongqing, pile foundations are often used for the foundations of buildings in high fill areas. According to geological survey data, most high fill pile foundation areas are free of groundwater, but after backfilling is completed, temporary water accumulation will occur due to surface water recharge such as rainfall. When carrying out pile foundation construction, precipitation operations must be carried out to reduce the risk of collapse.

[0003] At present, the traditional dewatering method for pile foundation areas is to construct dewatering wells in the area and perform dewatering operations on the area through dewatering. This dewatering method has disadvantages such as long dewatering cycles and high engineering costs.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a temporary dewatering method for high fill pile foundation areas to solve the problems of long dewatering cycles and high engineering costs in the prior art of dewatering pile foundation areas through the traditional method of constructing dewatering wells.

[0006] The temporary dewatering method for a high fill pile foundation area provided by the present invention comprises the following steps:

[0007] Based on the construction pile foundation engineering drawings, the pile foundation area is divided according to the preset range to obtain the temporary water catchment and precipitation service area;

[0008] In the temporary water collection and precipitation service area, a pile position with the lowest elevation of the top of the embedded rock layer is selected as the temporary precipitation pile hole position;

[0009] A casing is installed at the temporary dewatering pile hole, and a drilling operation is performed in the casing until a preset rock embedding elevation is reached to obtain a temporary dewatering pile hole;

[0010] Allow the temporary precipitation pile hole to stand for a first water collection time, and check the temporary water collection depth in the temporary precipitation pile hole;

[0011] When the temporary collected water depth in the temporary precipitation pile hole is less than the preset water collection depth and the hole wall is stable, the temporary precipitation pile hole is not subjected to precipitation treatment; when the temporary collected water depth in the temporary precipitation pile hole is greater than or equal to the preset water collection depth, a preset filter steel cage is installed in the temporary precipitation pile hole, and the pumping equipment is lowered to a preset height in the filter steel cage to precipitate the temporary collected water in the temporary precipitation pile hole until the preset precipitation requirement is met.

[0012] In addition, a preferred solution is that the preset range is an area with a radius of 10m-20m.

[0013] In addition, a preferred solution is that a casing is installed at the temporary dewatering pile hole, and drilling is performed in the casing until a preset rock embedding elevation is reached to obtain a temporary dewatering pile hole, including:

[0014] Positioning and laying out the temporary dewatering pile holes, and marking the laying out positions;

[0015] Install casing at marked laying locations;

[0016] Using concrete to harden the area within 300mm-500mm around the casing;

[0017] When the hardened site reaches the condition where people can enter, drilling operation is performed in the casing by using a drill bit and a drilling rig until the preset rock embedding elevation is reached to obtain a temporary dewatering pile hole.

[0018] In addition, a preferred solution is that during the installation of the casing,

[0019] The buried depth of the casing is not less than 2m;

[0020] The exposed height of the casing is 300mm-500mm.

[0021] In addition, a preferred solution is that the first water collection time is 30 min-90 min.

[0022] In addition, a preferred solution is that the preset water collection depth is 1 m.

[0023] In addition, a preferred solution is that the preset filtering steel cage includes a vertically arranged longitudinal reinforcement frame, a vertically arranged supporting steel ring arranged inside the longitudinal reinforcement frame, and a steel wire mesh wrapped around the outside and bottom of the longitudinal reinforcement frame; wherein,

[0024] The spacing between the supporting steel rings is 1m±0.5m;

[0025] The mesh size of the steel wire mesh is 5mm-10mm.

[0026] In addition, a preferred solution is that in the process of installing the preset filter steel cage into the temporary dewatering pile hole and lowering the pumping equipment into the preset filter steel cage to a preset height,

[0027] The preset filter steel cage is hoisted into the temporary dewatering pile hole by a crane, and the top of the preset filter steel cage is 300mm-500mm higher than the lower opening of the casing;

[0028] The preset filtering steel cage is fixed to the fixed steel bars pre-set transversely on the top of the casing by means of a fixed rope body;

[0029] Connect a water pumping hose to the water pumping device, place the water pumping device at a preset height in the preset filter steel cage, and fix the free end of the water pumping hose to the fixed steel bar pre-set transversely on the top of the casing;

[0030] Wherein, the length of the water pumping hose is greater than the depth of the temporary dewatering pile hole.

[0031] In addition, a preferred solution is that the preset precipitation requirement is:

[0032] After the temporary collected water in the temporary precipitation pile hole is pumped out, the pumping equipment is closed and left to stand for a second water collection time. If there is no obvious increase in the temporary collected water in the temporary precipitation pile hole, the precipitation is completed; wherein, the second water collection time is 30min-90min.

[0033] In addition, the preferred solution further comprises:

[0034] After determining that the temporary precipitation pile hole is not being precipitated or the temporary collected water in the temporary precipitation pile hole is being precipitated, other pile holes in the temporary water collection and precipitation service area where the temporary precipitation pile hole is located are drilled to carry out pile foundation construction.

[0035] It can be seen from the above technical scheme that the temporary dewatering method for high fill pile foundation area provided by the present invention divides the pile foundation area into regions to form a temporary dewatering service area within the water collection range, and then selects the pile position with the lowest elevation of the top of the embedded rock layer in the temporary dewatering service area as the temporary dewatering pile hole position, and performs drilling operations at the temporary dewatering pile hole position to obtain a temporary dewatering pile hole. It is judged whether the temporary dewatering service area needs dewatering according to the temporary collected water depth in the temporary dewatering pile hole within the first water collection time. If dewatering is needed, The preset filter steel cage is installed in the temporary dewatering pile hole, and the pumping equipment is lowered to the preset height in the filter steel cage to dewater the temporary collected water in the temporary dewatering pile hole until the preset dewatering requirement is met. The entire process does not require additional dewatering well construction, saving costs. The construction principle of "permanent and temporary combination" is fully considered, that is, the engineering piles also serve as temporary dewatering piles. After the temporary dewatering is completed, the engineering pile body can be cast without secondary pipe lifting and cage lowering, thereby improving construction efficiency and shortening construction period.

[0036] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] By referring to the following description in conjunction with the accompanying drawings, and with a more complete understanding of the present invention, other objects and results of the present invention will become more apparent and easily understood.

[0038] Figure 1 A flow chart of a temporary dewatering method for a high fill pile foundation area according to an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of the temporary water collection and precipitation service area and precipitation direction in the pile foundation area according to an embodiment of the present invention;

[0040] Figure 3 It is a schematic elevation view of a dewatering device for a temporary dewatering pile hole according to an embodiment of the present invention.

[0041] In the attached drawings, 1-temporary water collection and precipitation service area, 2-casing, 3-temporary precipitation pile hole, 4-preset filtering steel cage, 41-supporting steel ring, 42-wire mesh, 43-spiral stirrups, 5-pumping equipment, 6-fixed rope body, 7-fixed steel bar, 8-pumping hose, 9-horizontal protective steel mesh, 10-hardened site.

[0042] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0043] In view of the above, in the prior art, the traditional method of constructing dewatering wells to dewater the pile foundation area has the problems of long dewatering cycle and high engineering costs. A temporary dewatering method for high fill pile foundation area is proposed.

[0044] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] In order to illustrate the temporary dewatering method for high fill pile foundation area provided by the present invention, Figure 1 The process of the temporary dewatering method for high fill pile foundation area according to an embodiment of the present invention is shown; Figure 2 The temporary water collection and precipitation service area and precipitation direction of the pile foundation area according to an embodiment of the present invention are shown; Figure 3 A schematic elevation view of a dewatering device for a temporary dewatering pile hole according to an embodiment of the present invention is shown.

[0046] like Figures 1 to 3 As shown together, the temporary dewatering method for high fill pile foundation area provided by the present invention comprises the following steps:

[0047] Step S1: Based on the construction pile foundation engineering drawings, the pile foundation area is divided according to a preset range to obtain a temporary water catchment and precipitation service area 1.

[0048] Specifically, based on the construction drawings of the pile foundation project, the pile foundation area is divided into regions according to a preset range by using equipment such as a total station to obtain a temporary water catchment precipitation service area 1.

[0049] As a preferred solution of the present invention, the preset range is an area with a radius of 10m-20m.

[0050] It should be noted that the preset range is preferably but not limited to an area with a radius of 10m-20m, and can also be determined according to actual soil conditions. As long as regional water collection can be achieved, the present invention does not make any special limitations on this.

[0051] Step S2: In the temporary water collection and precipitation service area 1, a pile position with the lowest elevation of the top of the embedded rock layer is selected as the temporary precipitation pile hole position.

[0052] Specifically, within the temporary water catchment and precipitation service area 1, the pile position with the lowest elevation of the top of the embedded rock layer, that is, the pile position where the bottom of the pile is embedded deepest in the top of the rock layer, is selected as the temporary precipitation pile hole position, which can be obtained through the data file or design drawing of the engineering design.

[0053] Step S3, installing the casing 2 at the temporary dewatering pile hole position, and performing drilling operations in the casing 2 until the preset rock embedding elevation is reached to obtain the temporary dewatering pile hole 3.

[0054] Specifically, a casing 2 is installed at the temporary dewatering pile hole to facilitate drilling operations and protect the top of the hole. When the preset rock embedding elevation of the pile position is reached, a temporary dewatering pile hole 3 is obtained.

[0055] As a preferred solution of the present invention, a casing 2 is installed at the temporary dewatering pile hole position, and a drilling operation is performed in the casing 2 until a preset rock embedding elevation is reached to obtain a temporary dewatering pile hole 3, including:

[0056] Positioning and laying out the lines at temporary dewatering pile hole position 3, and marking the laying out positions;

[0057] Install casing 2 at the marked laying position;

[0058] Use concrete to harden the area within 300mm-500mm around the casing;

[0059] When the hardened site 10 reaches the condition where people can enter, drilling operation is performed in the casing 2 by means of a drill bit and a drilling rig until the preset rock embedding elevation is reached, thereby obtaining a temporary dewatering pile hole 3 .

[0060] Specifically, the casing 2 should be buried vertically and firmly, and 100mm thick C20 concrete can be used to harden the site within 300mm-500mm around the casing 2 to make it accessible to people. Then, a drill bit and a drilling rig matching the design diameter of the temporary dewatering pile hole are selected to drill and excavate until the rock-embedded elevation required by the design is reached.

[0061] As a preferred embodiment of the present invention, during the installation of the casing,

[0062] The buried depth of casing 2 is not less than 2m;

[0063] The exposed height of the casing 2 is 300mm-500mm.

[0064] The casing 2 is preferably made of 4-8 mm thick steel plate, its inner diameter should be 100 mm larger than the drill bit diameter, and 1-2 overflow holes are provided on the upper part.

[0065] It should be noted that the buried depth of the casing 2 is preferably but not limited to not less than 2m, and the exposed height of the casing is preferably but not limited to 300mm-500mm. It can be flexibly selected according to actual needs, and the present invention does not make any special restrictions on this.

[0066] Step S4, allowing the temporary precipitation pile hole to stand for a first water collection time, and checking the temporary water collection depth in the temporary precipitation pile hole.

[0067] Specifically, after the first water collection time is left to stand, the temporary water collection depth is checked. The temporary water collection depth can be checked by lowering a pole or other methods.

[0068] As a preferred embodiment of the present invention, the first water collection time is 30 min-90 min.

[0069] It should be noted that the first water collection time is preferably, but not limited to, 30 min to 90 min.

[0070] Step S5, when the temporary collected water depth in the temporary precipitation pile hole is less than the preset water collection depth and the hole wall is stable, the temporary precipitation pile hole is not subjected to precipitation treatment; when the temporary collected water depth in the temporary precipitation pile hole is greater than or equal to the preset water collection depth, the preset filter steel cage 4 is installed in the temporary precipitation pile hole 3, and the pumping equipment 5 is lowered to the preset height in the preset filter steel cage 4 to precipitate the temporary collected water in the temporary precipitation pile hole 3 until the preset precipitation requirement is met.

[0071] Specifically, when the temporary collected water depth in the temporary precipitation pile hole is less than the preset water collection depth and the hole wall is stable, it means that precipitation is not required in this area, so the temporary precipitation pile hole is not subjected to precipitation treatment; when the temporary collected water depth in the temporary precipitation pile hole is greater than or equal to the preset water collection depth, it means that precipitation treatment is required in this area, and the preset filter steel cage is installed in the temporary precipitation pile hole, and the pumping equipment is lowered to the preset height in the filter steel cage to precipitate the temporary collected water in the temporary precipitation pile hole until the preset precipitation requirement is met.

[0072] As a preferred solution of the present invention, the preset filtering steel cage 4 includes a vertically arranged longitudinal reinforcement frame, a vertically arranged supporting steel ring 41 arranged on the inner side of the longitudinal reinforcement frame, and a steel wire mesh 42 wrapped around the outer side and bottom of the longitudinal reinforcement frame; wherein, the spacing between the supporting steel rings 41 is 1m±0.5m; and the mesh diameter of the steel wire mesh 42 is 5mm-10mm.

[0073] Specifically, spiral hoop reinforcement 43 is wound around the outside of the steel mesh 42 to increase the firmness of the steel mesh 42. The filter steel cage 4 is centrally manufactured according to the specifications of the filter mesh and the design requirements of the steel cage. The spacing of the support steel rings 41 is preferably, but not limited to, 1m±0.5m, and is spot-welded to each longitudinal reinforcement. The outer and bottom filter steel meshes 42 are preferably, but not limited to, fully wrapped with steel mesh with a diameter of 0.8mm and a hole diameter of 5mm-10mm, and fixed with wire ties. The manufacturing size of the preset filter steel cage 4 should meet the design requirements and be 0.5-1m shorter than the depth of the temporary precipitation pile hole 3.

[0074] As a preferred solution of the present invention, the preset water collection depth is 1m.

[0075] It should be noted that the preset water collection depth is preferably but not limited to 1 m, and can be set according to actual needs, and the present invention does not make any special limitation on this.

[0076] As a preferred embodiment of the present invention, during the process of installing the preset filter steel cage into the temporary dewatering pile hole and lowering the pumping equipment into the filter steel cage to a preset height,

[0077] Use a crane to hoist the preset filter steel cage 4 into the temporary dewatering pile hole 3, and make the top of the preset filter steel cage 4 300mm-500mm higher than the lower end of the casing 2;

[0078] The preset filtering steel cage 4 is fixed to the fixed steel bars 7 pre-set transversely on the top of the casing 2 by means of the fixed rope body 6;

[0079] Connect a water pumping hose 8 to the water pumping device 5, place the water pumping device 5 at a preset height in the preset filter steel cage 4, and fix the free end of the water pumping hose 8 to the fixed steel bar 7 pre-set horizontally on the top of the casing 2;

[0080] The length of the water pumping hose 8 is greater than the depth of the temporary dewatering pile hole 3 .

[0081] Specifically, the fixed rope body 6 is preferably a nylon rope, and the fixed steel bar 7 is preferably a φ18 threaded steel bar. The φ18 threaded steel bar is inserted into the reserved hole at the top of the casing 2, the free ends of the water pump hose and the nylon rope are centrally fixed to the threaded steel bar, and the water pump is slowly lowered to the bottom of the filter steel cage.

[0082] As a preferred embodiment of the present invention, the preset precipitation requirement is:

[0083] After the temporary collected water in the temporary precipitation pile hole is pumped out, the pumping device 5 is closed and left to stand for a second water collection time. If there is no obvious increase in the temporary collected water in the temporary precipitation pile hole, the precipitation is completed; wherein, the second water collection time is 30min-90min.

[0084] As a preferred solution of the present invention, it also includes: after determining that the temporary precipitation pile hole is not undergoing precipitation or completing the precipitation of the temporary collected water in the temporary precipitation pile hole, drilling other pile holes in the temporary water collection and precipitation service area where the temporary precipitation pile hole is located to carry out pile foundation construction.

[0085] As a preferred solution of the present invention, a horizontal protective steel mesh 9 is covered on the top of the casing 2, which does not need to be moved during precipitation, and can effectively prevent workers from falling from the hole, thereby reducing construction safety risks.

[0086] In order to better explain in detail the practical application of the temporary dewatering method for high fill pile foundation area provided by the present invention, the following specific embodiments are provided.

[0087] Example 1

[0088] A certain project is located in a mountainous and hilly area. The housing construction area needs to be backfilled with qualified fillers for 20-30m to reach the completion elevation of the site leveling construction. After the site leveling project is qualified, the foundation engineering construction will begin. The foundation form of this project is the construction of N bored piles. According to the geological survey report, there is no groundwater in the area. By selecting a pile foundation with a higher pile bottom elevation for trial piles, there is water storage at the bottom of the hole after the hole is formed. According to the investigation, it is due to the collection of surface water such as rainwater and mountain seepage. The water storage depth at the bottom of the hole is measured by the hanging rope to be more than 1m, and temporary water collection and precipitation treatment is required.

[0089] The temporary dewatering method for high fill pile foundation area includes the following steps:

[0090] Determine the control boundary line of the building and structure in the high fill area, delineate the temporary drainage service area 1 according to the R20m range in the pile foundation construction area, and determine the temporary drainage pile hole control line according to the delineated temporary drainage service area 1 and the pile bottom elevation (i.e. the maximum distance from the top surface of the embedded rock layer), and mark it.

[0091] The process of temporary dewatering pile hole excavation is as follows:

[0092] Preparation before construction: Before excavating the temporary dewatering pile hole 3, first install the casing 2. The length of the casing 2 is selected according to actual needs, the buried depth is not less than 2m, and the exposed height is 500mm. The burial should be vertical and stable, and the C20 concrete hardened site 10 is constructed within 500mm around the casing 2, with a thickness of not less than 100mm. Then, select a drill bit and a drilling rig that match the design aperture of the temporary dewatering pile hole to drill and excavate until the rock-embedded elevation required by the design.

[0093] Check the temporary collection water depth and treatment:

[0094] After standing for 30 minutes, check the temporary collected water depth. If the temporary collected water depth is less than 1m and the pile hole wall is relatively stable, no precipitation treatment is required; if the temporary collected water depth is greater than or equal to 1m, precipitation operation is performed.

[0095] The production process of the preset filter steel cage 4 is as follows:

[0096] The preset filter steel cage 4 is manufactured in a centralized manner according to the specifications and dimensions of the filter screen and the design requirements of the steel cage. The spacing between the support steel rings 41 is 1m, and the contact parts with each longitudinal reinforcement are spot welded. The outer and bottom filter steel meshes 42 are fully wrapped with steel meshes with a diameter of 0.8mm and a mesh size of 5mm, and are securely fixed with wire. The manufacturing dimensions of the preset filter steel cage 4 should meet the design requirements, and are generally 0.5-1m shorter than the depth of the temporary dewatering pile hole 3.

[0097] The process of precipitation operation is as follows:

[0098] The preset filtering steel cage 4 is hoisted by a crane into the excavated temporary dewatering pile hole 3, with the top elevation slightly higher than the lower end of the casing 2 to prevent the hole wall from collapsing and causing soil and rocks to fall into the preset filtering steel cage 4 and damage the water pump. The water pump is connected to the water pump belt (water pump hose) and tied to one end of the nylon lifting rope. The lengths of the water pump belt and the nylon lifting rope are both greater than the depth of the temporary dewatering pile hole. The fixed steel bar 7 uses φ18 threaded steel bars to penetrate into the reserved holes on the top of the casing 2, and the free ends of the water pump belt and the nylon lifting rope are tied to the fixed steel bar 7 in the center, and the water pump is slowly lowered to the bottom of the preset filtering steel cage 4.

[0099] The process of drainage pipe installation and precipitation operation is as follows:

[0100] Install a drainage pipe on the ground and connect it to the pump belt. Provide horizontal and edge protection for the temporary precipitation pile hole opening. Then carry out precipitation operations to pump the temporarily collected water in the pile hole to the designated location and discharge it into the municipal pipe network after sedimentation.

[0101] The process of determining the completion of precipitation is as follows:

[0102] After the temporary collection water in the temporary precipitation pile hole 3 is pumped out (the temporary collection water depth is less than 300mm, turn off the power of the pump and let it stand for 30 minutes. If there is no obvious increase in the collection water, the precipitation in the area is completed.

[0103] Repeat the above steps to complete the temporary water collection and precipitation work in all high fill pile foundation areas.

[0104] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

[0105] It can be seen from the above specific implementation methods that the temporary dewatering method for high fill pile foundation area provided by the present invention divides the area through the pile foundation to form a temporary dewatering service area within the water collection range, and then selects the pile position with the lowest elevation of the top of the embedded rock layer in the temporary dewatering service area as the temporary dewatering pile hole position, and performs drilling operations at the temporary dewatering pile hole position to obtain a temporary dewatering pile hole. It is judged whether the temporary dewatering service area needs dewatering according to the temporary collected water depth in the temporary dewatering pile hole within the first water collection time. If dewatering is needed, By installing the preset filtering steel cage into the temporary dewatering pile hole and lowering the pumping equipment to the preset height in the filtering steel cage, the temporary collected water in the temporary dewatering pile hole can be dewatered until the preset dewatering requirement is met. The whole process does not require additional dewatering well construction, saving costs. The construction principle of "permanent and temporary combination" is fully considered, that is, the engineering piles also serve as temporary dewatering piles. After the temporary dewatering is completed, the engineering pile body can be cast without secondary pipe lifting and cage lowering, thereby improving construction efficiency and shortening construction period.

[0106] As described above, the temporary dewatering method for high fill pile foundation area proposed by the present invention is described by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can be made to the temporary dewatering method for high fill pile foundation area proposed by the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A temporary dewatering method for a high fill pile foundation area, characterized in that: The steps include: Based on the construction pile foundation engineering drawings, the pile foundation area is divided according to the preset range to obtain the temporary water catchment and precipitation service area; In the temporary water collection and precipitation service area, a pile position with the lowest elevation of the top of the embedded rock layer is selected as the temporary precipitation pile hole position; A casing is installed at the temporary dewatering pile hole, and a drilling operation is performed in the casing until a preset rock embedding elevation is reached to obtain a temporary dewatering pile hole; Allow the temporary precipitation pile hole to stand for a first water collection time, and check the temporary water collection depth in the temporary precipitation pile hole; When the temporary collected water depth in the temporary precipitation pile hole is less than the preset water collection depth and the hole wall is stable, the temporary precipitation pile hole is not subjected to precipitation treatment; when the temporary collected water depth in the temporary precipitation pile hole is greater than or equal to the preset water collection depth, a preset filter steel cage is installed in the temporary precipitation pile hole, and the pumping equipment is lowered to a preset height in the preset filter steel cage to precipitate the temporary collected water in the temporary precipitation pile hole until the preset precipitation requirement is met.

2. The temporary dewatering method for high fill pile foundation area according to claim 1, characterized in that: The preset range is an area with a radius of 10m-20m.

3. The temporary dewatering method for high fill pile foundation area according to claim 1, characterized in that: The temporary dewatering pile hole is provided with a casing and a drilling operation is performed in the casing until a preset rock embedding elevation is reached to obtain a temporary dewatering pile hole, including: Positioning and laying out the temporary dewatering pile holes, and marking the laying out positions; Install casing at marked laying locations; Using concrete to harden the area within 300mm-500mm around the casing; When the hardened site reaches the condition where people can enter, drilling operation is performed in the casing by using a drill bit and a drilling rig until the preset rock embedding elevation is reached to obtain a temporary dewatering pile hole.

4. The temporary dewatering method for high fill pile foundation area according to claim 1, characterized in that: During the installation of the casing, The buried depth of the casing is not less than 2m; The exposed height of the casing is 300mm-500mm.

5. The temporary dewatering method for high fill pile foundation area according to claim 1, characterized in that: The first water collection time is 30 min-90 min.

6. The temporary dewatering method for high fill pile foundation area according to claim 1, characterized in that: The preset water collection depth is 1m.

7. The temporary dewatering method for high fill pile foundation area according to claim 1, characterized in that: The preset filtering steel cage includes a vertically arranged longitudinal reinforcement frame, a vertically arranged supporting steel ring arranged inside the longitudinal reinforcement frame, and a steel wire mesh wrapped around the outside and bottom of the longitudinal reinforcement frame; wherein, The spacing between the supporting steel rings is 1m±0.5m; The mesh size of the steel wire mesh is 5mm-10mm.

8. The temporary dewatering method for high fill pile foundation area according to claim 1, characterized in that: In the process of installing the preset filter steel cage into the temporary dewatering pile hole and lowering the pumping equipment into the preset filter steel cage to a preset height, The preset filter steel cage is hoisted into the temporary dewatering pile hole by a crane, and the top of the preset filter steel cage is 300mm-500mm higher than the lower opening of the casing; The preset filtering steel cage is fixed to the fixed steel bars pre-set transversely on the top of the casing by means of a fixed rope body; Connect a water pumping hose to the water pumping device, place the water pumping device at a preset height in the preset filter steel cage, and fix the free end of the water pumping hose to the fixed steel bar pre-set transversely on the top of the casing; Wherein, the length of the water pumping hose is greater than the depth of the temporary dewatering pile hole.

9. The temporary dewatering method for high fill pile foundation area according to claim 1, characterized in that: The preset precipitation requirements are: After the temporary collected water in the temporary precipitation pile hole is pumped out, the pumping equipment is closed and left to stand for a second water collection time. If there is no obvious increase in the temporary collected water in the temporary precipitation pile hole, the precipitation is completed; wherein, the second water collection time is 30min-90min.

10. The temporary dewatering method for high fill pile foundation area according to claim 1, characterized in that: Also includes: After determining that the temporary precipitation pile hole is not being precipitated or the temporary collected water in the temporary precipitation pile hole is being precipitated, other pile holes in the temporary water collection and precipitation service area where the temporary precipitation pile hole is located are drilled to carry out pile foundation construction.

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