CN113833000A - Dewatering well device based on expansion material and construction method thereof - Google Patents
Dewatering well device based on expansion material and construction method thereof Download PDFInfo
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- CN113833000A CN113833000A CN202111151838.7A CN202111151838A CN113833000A CN 113833000 A CN113833000 A CN 113833000A CN 202111151838 A CN202111151838 A CN 202111151838A CN 113833000 A CN113833000 A CN 113833000A
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- well
- pipe
- joint
- filter
- dewatering
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a dewatering well device based on an expansion material, which comprises a well shoe type drill bit, a filtering section, a bag type expansion joint and a well pipe body which are sequentially connected from bottom to top, wherein a sedimentation pipe is arranged in the filtering section, and the bag type expansion joint seals the upper end of the filtering section of the dewatering well, so that the burst of underground water can be prevented. The invention also discloses a construction method of the dewatering well device, which comprises the following steps of firstly, determining the length of each section of structure according to stratum distribution; in the hole forming of the drilling machine, a filtering joint and a bag type expansion joint are assembled in sections and are sunk in place while drilling; the bag type expansion joint can play a role in the well pipe well washing process; after the installation is finished, the water pump can work directly and can be recycled after the use. The invention can be used as an emergency dewatering relief well for foundation pit or tunnel leakage disasters to be applied to the field, and can also be used as a general dewatering well to be matched with engineering; compared with the traditional well forming technology, the invention simplifies the dewatering well device, optimizes the well forming process and saves the time for filling filter materials on site in the well forming process after drilling.
Description
Technical Field
The invention relates to a precipitation technology before foundation pit excavation and a foundation pit or tunnel seepage disaster emergency and precipitation pressure reduction technology, in particular to a precipitation well device based on an expansion material and a construction method thereof.
Background
When the foundation ditch excavation, the construction needs dry operation face, simultaneously for guaranteeing construction safety, excavate and go to and need precipitation engineering, so the precipitation well device of foundation ditch engineering is indispensable. The traditional well forming technology of the dewatering well has various defects, such as poor well forming effect, easy occurrence of well breaking and dead well; the well formation adopts slurry wall protection, and the working procedures of a drilling machine, well washing and the like are complicated, so that the well formation time is long.
In engineering, along with the continuous expansion of excavation depth of a foundation pit, the traditional bottom-falling type waterproof curtain has the phenomena of long construction period, high construction cost, incapability of ensuring construction quality and the like. In order to save the construction cost and reduce the construction period, a suspended waterproof curtain is usually adopted, the suspended waterproof curtain is not inserted into the waterproof layer, and water outside the pit bypasses the waterproof curtain and enters the pit during the precipitation period. The risk of surging appears in the foundation ditch, to outside the hole, need carry out decompression precipitation for the foundation ditch bottom plate falls below the safe flood peak, and for the safety of assurance foundation ditch, pressure-bearing precipitation also seems to be especially important.
In actual engineering, structures such as waterproof curtains or tunnel segments of foundation pits can cause leakage disasters due to quality factors, accidental reasons and the like, and when the leakage disasters are treated, leakage parts need to be plugged through other technologies such as grouting. In order to reduce the water leakage amount, the water head difference inside and outside the tunnel (foundation pit) is reduced by matching with plugging, and precipitation and pressure reduction are required to be carried out near the leakage point, so that the water leakage reduction well is generally called as an emergency relief dewatering well. For the emergency relief well, the well forming speed and the well forming quality are particularly important for the treatment of leakage disasters.
In addition, in the traditional dewatering well forming construction, filter materials need to be manually filled, and the quality of the dewatering well cannot achieve the expected effect due to the accident conditions of filter material blockage, well pipe inclination and the like easily occurring in the well forming process; and the filter material can not be recycled, the manufacturing cost is high, and the waste is serious.
Disclosure of Invention
The invention aims to solve the technical problem of rapid well formation of a decompression dewatering well in emergency rescue of a leakage disaster, and provides a dewatering well device based on an expansion material and a construction method thereof, which can effectively solve the problems of low construction speed, complex well formation procedure and pending improvement of quality of the traditional dewatering well.
The technical scheme adopted by the invention is as follows: the utility model provides a precipitation well device based on expanded material, includes by lower supreme connecting gradually:
a well shoe drill bit;
the filter joint comprises a filter joint well pipe and a filter sleeved on the filter joint well pipe, and the pipe wall of the filter joint well pipe is provided with a water permeable hole;
the bag type expansion joint comprises an expansion joint well pipe, a storage bag sleeved on the expansion joint well pipe and a water-swellable material stored in the storage bag, wherein a water-permeable hole is formed in the pipe wall of the expansion joint well pipe; and
a well pipe body;
the precipitation well device further comprises a precipitation pipe, the precipitation pipe is arranged in the filtering joint well pipe and is located at the lower part of the filtering joint well pipe, and the precipitation pipe and the filtering joint well pipe are coaxially arranged.
Furthermore, the well pipe body is formed by sequentially connecting a plurality of well pipe monomers, and the adjacent well pipe monomers are connected through screw threads.
Furthermore, the upper end of the expansion joint well pipe is connected with the well pipe single body of the lowest joint of the well pipe body through a thread, and the lower end of the expansion joint well pipe is connected with the filtering joint well pipe through a thread.
Further, the filter is a multilayer mesh screen, and each layer of mesh screen is made of porous hydrophobic polymer materials, or the filter comprises a wire gauze frame and a filter material filled in the wire gauze frame.
Further, the outer diameter of the filter is adapted to the inner diameter of the precipitation borehole and the inner diameter of the filter is adapted to the outer diameter of the filter articulated pipe.
Further, the storage bag is made by winding a rubber belt on the expansion joint well pipe, and the upper end and the lower end of the rubber belt are respectively fastened through fastening hose clamps.
Further, the water-swellable material is a polyesteramide or a urethane polymer.
Furthermore, a layer of film is arranged on the inner wall of the expansion joint well pipe, a lead is arranged on the film, and after the dewatering well device is lowered to a specified position, the film is detached through the lead so that the expansion joint well pipe works.
Further, the shoe drill bit is connected to the filter subs by a threaded connection.
The other technical scheme adopted by the invention is as follows: the construction method of the dewatering well device comprises the following steps:
and 8, backfilling the precipitation well hole.
The invention has the beneficial effects that:
1) the prefabricated dewatering well device is adopted, the traditional well construction procedures (such as slurry retaining walls, concrete capping and the like) are simplified, the well construction time is shortened, and the precious rescue time is won for effectively treating leakage disasters.
2) The application of the well shoe type drill bit can ensure the integrated construction of the drilling machine and the well pipe and also save the engineering time to a certain extent.
3) The bag-type expansion joint based on the water-swellable material can be used without filling filter materials, clay balls and the like on the outer wall of the well pipe, so that the engineering emergency time is saved.
4) The bag-type expansion joint based on the water-swellable material can effectively prevent the water burst risk of underground water, so that a water-lowering well point can be safely and efficiently carried out, and support is provided for solving the problem of leakage disasters.
Drawings
FIG. 1: the invention relates to a structural section view of a dewatering well device based on an expansion material (the water-swelling material is not expanded);
FIG. 2: the invention relates to a structural section view of a dewatering well device based on an expansion material (the water-swelling material swells when meeting water);
FIG. 3 a: the outline of the filter of the invention is schematic;
FIG. 3 b: a schematic of the filter of the present invention in a mesh screen configuration;
FIG. 4: the structure of the connection between the well shoe type drill bit and the well pipe is shown schematically;
FIG. 5 a: schematic representation of the bladder-type expansion joint of the present invention (no water-swellable material is contained in the storage bag);
FIG. 5 b: schematic diagram of the bag-type expansion joint of the invention (water-swelling material is filled in the storage bag);
FIG. 5 c: schematic representation of the bladder-type expansion joint of the present invention (water-swellable material in the storage bag is water-swellable);
the attached drawings are marked as follows:
1-a well shoe drill bit; 2-filtering the articulated well pipe;
3-a filter; 4-expansion joint well pipe;
5-storage bag; 6-water swellable material;
7-well pipe body; 8-a settling tube;
9-coating film; 10-lead wire;
11-fastening throat hoop; 12-thread screw thread;
w-confined aquifer; s-water-proof soil layer.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in fig. 1 to 5c, the dewatering well device based on the expansion material comprises a well shoe type drill bit 1, a filtering joint, a bag type expansion joint and a well pipe body 7 which are connected in sequence from bottom to top, and further comprises a settling pipe 8.
The filtering joint comprises a filtering joint well pipe 2 and a filter 3 sleeved on the filtering joint well pipe 2, and normal operation of precipitation is guaranteed. And the pipe wall of the filtering joint well pipe 2 is provided with water permeable holes. The outer diameter of the filter 3 should be adapted to the inner diameter of the precipitation well bore and the inner diameter of the filter 3 should be adapted to the outer diameter of the filter articulated well pipe 2, as shown in fig. 3a, to avoid loosening or crushing. The filter 3 can be a multi-layer mesh screen, each layer of the mesh screen is made of porous hydrophobic polymer material, as shown in fig. 3b, or the filter 3 can be composed of a wire mesh frame and a gravel filter material filled in the wire mesh frame; the filter 3 can be prefabricated and assembled for use by a factory. The filtering section can be of an assembled structure and can be used in the field immediately, so that the emergency time is saved.
The bag type expansion joint comprises an expansion joint well pipe 4, a storage bag 5 sleeved on the expansion joint well pipe 4 and a water-swelling material 6 stored in the storage bag 5. And the pipe wall of the expansion joint well pipe 4 is provided with water permeable holes. The storage bag 5 is made by winding a rubber belt on the expansion joint well pipe 4, and the upper end and the lower end of the rubber belt are respectively fastened through a fastening hoop 11. The water-swellable material 6 may be a material that is swellable with water, such as polyesteramide or urethane polymer, and has light weight, compactness, and low dispersibility. A layer of coating 9 is further disposed on the inner wall of the expansion joint well pipe 4 to prevent the water-swellable material 6 from contacting water prematurely, as shown in fig. 5a to 5c, a lead 10 is disposed on the coating 9, the length of the lead 10 is configured such that the end of the lead can extend out of the precipitation well hole after the precipitation well device is lowered to a specified position, and after the precipitation well device is lowered to the specified position, the coating 9 is removed through the lead 10 to enable the expansion joint well pipe 4 to work. After the dewatering well device is installed, the water swelling material 6 swells when meeting water, the upper end of the water well filtering joint is blocked, and therefore the sudden surge of underground water can be prevented.
The well pipe body 7 is formed by sequentially connecting a plurality of well pipe monomers.
The well casing units are adjacent to each other, the lowest well casing unit of the well casing body 7 and the expansion joint well casing 4 are connected through screw threads, the expansion joint well casing 4 and the filtering joint well casing 2 are connected through screw threads, and the well casing of the dewatering well device is formed.
The settling pipe 8 is arranged in the filtering joint well pipe 2 and is positioned at the lower part of the filtering joint well pipe 2, the settling pipe 8 and the filtering joint well pipe 2 are coaxially arranged, and the outer wall of the settling pipe 8 is closely attached to the inner wall of the filtering joint well pipe 2.
In order to cooperate with a hole-forming drilling machine to integrally sink a well pipe, a well shoe type drill bit 1 is arranged at the bottom of a filtering section of a dewatering well device, and the well pipe can be sunk in place while being drilled by a drilling machine through the well shoe type drill bit 1, so that the time is saved. The well shoe drill 1 is connected to the filter joint pipe 2 by a screw thread 12, which prevents the filter 3, the settling pipe 8 and the filter joint pipe 2 from falling off, as shown in fig. 3.
If the dewatering well device is applied to the process of rescuing from the seepage disaster of a foundation pit or a tunnel, the typical soil layer distribution of a site is determined in advance according to the geological exploration data and the like, and the lengths of the settling pipe 8, the filter 3, the filtering well casing 2, the expansion well casing 4 and each well casing monomer in the dewatering well device assembly are determined according to the soil layer distribution; and meanwhile, a filtering section and a bag type expansion section of the dewatering well device are assembled.
The construction method of the dewatering well device comprises the following steps:
and 8, backfilling the precipitation well hole.
The invention can be used as an emergency dewatering relief well for foundation pit or tunnel leakage disasters to be applied to the field, and can also be used as a general dewatering well to be matched with engineering. Compared with the traditional well forming technology, the invention simplifies the dewatering well device, optimizes the well forming process and saves the time for filling filter materials on site in the well forming process after drilling. Therefore, the invention has the characteristics of good overall quality, high well completion speed, environmental protection and recoverability, and provides the available dewatering well device for quickly completing the well and the construction method for the seepage disaster emergency engineering in the future.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (10)
1. The utility model provides a precipitation well device based on expanded material which characterized in that includes by supreme connecting gradually down:
a well shoe drill (1);
the filter joint comprises a filter joint well pipe (2) and a filter (3) sleeved on the filter joint well pipe (2), and a water permeable hole is formed in the pipe wall of the filter joint well pipe (2);
the bag type expansion joint comprises an expansion joint well pipe (4), a storage bag (5) sleeved on the expansion joint well pipe (4) and a water-swellable material (6) stored in the storage bag (5), wherein a water permeable hole is formed in the pipe wall of the expansion joint well pipe (4); and
a well tubular body (7);
the dewatering well device further comprises a settling pipe (8), the settling pipe (8) is arranged in the filtering well-saving pipe (2) and is located at the lower part of the filtering well-saving pipe (2), and the settling pipe (8) and the filtering well-saving pipe (2) are coaxially arranged.
2. Dewatering well device according to claim 1, characterized in that the well tubular bodies (7) are made of several well tubular single bodies connected in sequence, and adjacent well tubular single bodies are connected by thread.
3. Dewatering well device based on expanded material according to claim 2, characterized in that the expanded joint tubular (4) is threaded at its upper end to the lowermost tubular element of the tubular body (7) and threaded at its lower end to the filter joint tubular (2).
4. The swelling material-based dewatering well device according to claim 1, wherein the filter (3) is a multi-layer mesh screen, each layer of the mesh screen is made of a porous hydrophobic polymer material, or the filter (3) comprises a wire net rack and a filter material filled in the wire net rack.
5. Dewatering well device on the basis of expanded material according to claim 1, characterized in that the outer diameter of the filter (3) is adapted to the inner diameter of the dewatering well bore and the inner diameter of the filter (3) is adapted to the outer diameter of the filter articulated well pipe (2).
6. Dewatering well device based on expanded material according to claim 1, characterized in that the storage bag (5) is made by winding rubber belt around the expansion joint well pipe (4), the upper and lower ends of the rubber belt are fastened by fastening hose clamps (11).
7. Dewatering well device according to claim 1, characterized in that the water swellable material (6) is a polyesteramide or a urethane polymer.
8. The swelling material-based dewatering well device according to claim 1, wherein a layer of coating (9) is arranged on the inner wall of the expansion joint well pipe (4), a lead wire (10) is arranged on the coating (9), and after the dewatering well device is lowered to a specified position, the coating (9) is removed through the lead wire (10) so as to enable the expansion joint well pipe (4) to work.
9. Dewatering well device based on expanded material according to claim 1, characterized in that the shoe drill bit (1) is connected with the filter joint casing (2) by means of a threaded screw thread (12).
10. A construction method of dewatering well device as claimed in any one of claims 1 to 9, characterized by comprising the steps of:
step 1, determining typical soil layer distribution of a site, and determining the lengths of a settling pipe (8), a filter (3), a filtering well casing pipe (2), an expansion well casing pipe (4) and a well casing body (7) of a dewatering well device according to the soil layer distribution;
step 2, assembling the filter (3) on the outer side of the filter joint well pipe (2) to complete the assembly of the filter joint; winding a rubber belt on an expansion joint well pipe (4), fastening the lower end of the rubber belt by using a fastening hose clamp (11), storing a water-swelling material (6) in the rubber belt, fastening the upper end of the rubber belt by using the fastening hose clamp (11), arranging a coating (9) on the inner wall of the expansion joint well pipe (4), arranging a lead (10) on the coating (9), and completing the assembly of the bag type expansion joint, wherein the length of the lead (10) is configured to enable the end part of the lead (10) to extend out of a precipitation well hole after a precipitation well device is lowered to a designated position; a well shoe type drill bit (1) is arranged at the bottom of the filtering joint well pipe (2), and a sedimentation pipe (8) is arranged in the filtering joint well pipe (2);
step 3, forming a precipitation well hole at the designated position by the drilling machine, and sinking the well shoe type drill bit (1) and the filtering section into the precipitation well hole along with the drilling rod;
step 4, the well boot type drill bit (1) continues to drill downwards, and the drilling rod sequentially sinks the bag type expansion joint and the well pipe monomer from bottom to top until the filtering joint reaches a water-bearing layer of target precipitation; connecting the filtering well pipe (2) with the expansion joint well pipe (4), the expansion joint well pipe (4) with the well pipe monomer of the lowest joint of the well pipe body (7) and the adjacent well pipe monomer;
step 5, detaching the coating (9), putting down a water pump in the filter joint well pipe (2), and performing well washing operation;
step 6, starting the water pumping pump, and enabling the dewatering well device to work normally;
step 7, after the dewatering well device is used, pulling out the dewatering well device for recycling;
and 8, backfilling the precipitation well hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111151838.7A CN113833000A (en) | 2021-09-29 | 2021-09-29 | Dewatering well device based on expansion material and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111151838.7A CN113833000A (en) | 2021-09-29 | 2021-09-29 | Dewatering well device based on expansion material and construction method thereof |
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| Publication Number | Publication Date |
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| CN113833000A true CN113833000A (en) | 2021-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111151838.7A Pending CN113833000A (en) | 2021-09-29 | 2021-09-29 | Dewatering well device based on expansion material and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115369900A (en) * | 2022-08-12 | 2022-11-22 | 山西四建集团有限公司 | Comprehensive room core backfill dewatering well sealing method |
| CN115680497A (en) * | 2022-10-25 | 2023-02-03 | 天津大学 | Rapid well drilling device and method with filter tube and inner core drill rod separable |
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| CN212532503U (en) * | 2020-06-24 | 2021-02-12 | 中国地质调查局水文地质环境地质调查中心 | Multilayer filter for narrow space in well |
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Patent Citations (7)
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| CN106836254A (en) * | 2017-04-10 | 2017-06-13 | 张继红 | One kind is without sand dewatering well and its construction method |
| CN109881692A (en) * | 2019-03-22 | 2019-06-14 | 上海长凯岩土工程有限公司 | Pre-assembled dewatering well |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115369900A (en) * | 2022-08-12 | 2022-11-22 | 山西四建集团有限公司 | Comprehensive room core backfill dewatering well sealing method |
| CN115680497A (en) * | 2022-10-25 | 2023-02-03 | 天津大学 | Rapid well drilling device and method with filter tube and inner core drill rod separable |
| CN115680497B (en) * | 2022-10-25 | 2024-05-07 | 天津大学 | Quick well drilling device and method with separable filter tube and inner core drill rod |
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Application publication date: 20211224 |
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