CN110820781A - Well plugging method for dewatering well - Google Patents
Well plugging method for dewatering well Download PDFInfo
- Publication number
- CN110820781A CN110820781A CN201911222834.6A CN201911222834A CN110820781A CN 110820781 A CN110820781 A CN 110820781A CN 201911222834 A CN201911222834 A CN 201911222834A CN 110820781 A CN110820781 A CN 110820781A
- Authority
- CN
- China
- Prior art keywords
- steel sleeve
- dewatering
- well
- bottom plate
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a well plugging method for a dewatering well, wherein a steel sleeve is inserted on the ground, the inner diameter of the steel sleeve is larger than the outer diameter of a dewatering pipe, and the steel sleeve is sleeved outside the dewatering pipe; welding a water stopping wing on the outer wall of the steel sleeve in a full seam mode, wherein the water stopping wing is a circular flat plate surrounding the steel sleeve, and the water stopping wing annularly protrudes out of the outer wall of the steel sleeve; concrete is poured outside the steel sleeve to form a bottom plate, and the water stop wing is enclosed in the bottom plate when the concrete is poured; pumping out the downcomer upwards, wherein the steel sleeve is of a hollow structure, injecting a backfill material into the steel sleeve, welding the full seam at the top end of the steel sleeve, and sealing the top end of the steel sleeve; according to the well sealing method of the dewatering well, the steel sleeve with larger size is sleeved outside the dewatering pipe, the dewatering pipe can be pulled out, the length of the steel sleeve is far smaller than that of the dewatering pipe, material waste when the dewatering well is sealed is reduced, and cost is reduced.
Description
Technical Field
The invention relates to the technical field of building construction, and further relates to a well plugging method for a dewatering well.
Background
With the rapid development of the building industry and the appearance of high-rise buildings, most foundation foundations are arranged below the ground water level, and if the problem of poor ground water is solved, a large amount of ground water can rush into a foundation pit to cause great troubles to construction, so that the foundation pit can crack, collapse, piping and the like. In order to ensure the smooth operation of the engineering, the water level is reduced to be below the designed base elevation by adopting a well point dewatering method under the common condition, and then the construction is carried out.
When the dewatering well drains water, a dewatering pipe needs to be drilled on the ground, an opening for communicating is formed in the pipe wall of the dewatering pipe, and underground water enters the dewatering pipe through the opening; in general, when the basement construction is completed, the dewatering well needs to be closed, and the traditional dewatering well closing method is to directly cut off the dewatering pipe, and the dewatering pipe is inserted into the ground to a longer depth, so that the material waste is caused.
For those skilled in the art, how to reduce the material waste when the dewatering well is closed is a technical problem that needs to be solved at present.
Disclosure of Invention
The invention provides a well plugging method for a dewatering well, which adopts a steel sleeve to replace a dewatering pipe, can reduce material waste, and has the following specific scheme:
a well plugging method for a dewatering well comprises the following steps:
inserting a steel sleeve on the ground, wherein the steel sleeve is sleeved outside the downcomer;
welding a water stopping wing on the outer wall of the steel sleeve in a full seam mode, wherein the water stopping wing is a circular flat plate surrounding the steel sleeve;
pouring concrete outside the steel sleeve to form a bottom plate, wherein the water stop wing is enclosed in the bottom plate;
the downcomer is drawn out upwards;
and injecting a backfill material into the steel sleeve, and welding the top end of the steel sleeve at full seam.
Optionally, the hydrofoil is provided with two channels.
Optionally, the hemp thread is wound outside the steel sleeve.
Optionally, the bottom end of the steel casing extends below the lower surface of the deck and the top end of the steel casing extends above the upper surface of the deck.
Optionally, the steel sleeve is cut after the bottom plate is poured, so that the top end of the steel sleeve is located below the upper surface of the bottom plate.
Optionally, the injecting backfill material into the steel casing comprises:
and the bottom elevation of the cushion layer below the bottom plate is backfilled by adopting medium coarse sand below 1m, and then high-grade plain concrete higher than the bottom plate concrete by one grade is poured to the position 100mm below the top surface of the bottom plate.
Optionally, plugging each dewatering well by adopting an interval plugging method:
plugging the dewatering wells in a working state at intervals;
after the dewatering wells are plugged at intervals, the working states of the dewatering wells which are not plugged are continuously observed, wherein the working states comprise water yield conditions, water level change values, stable water level elevation and water pump position elevation;
judging whether one of the following three precondition conditions is satisfied, if yes, plugging the residual dewatering wells one by one:
completing the construction of the bottom plate;
or, the anti-floating requirement of the main structure is met;
or the stable water level in the dewatering well in the foundation pit is 1-2 m below the surface of the foundation pit.
Optionally, before the bed course below the bottom plate is poured, the outer wall of the concrete filter tube of the dewatering well below the bed course is firstly removed.
The invention provides a well plugging method for a dewatering well, wherein a steel sleeve is inserted on the ground, the inner diameter of the steel sleeve is larger than the outer diameter of a dewatering pipe, and the steel sleeve is sleeved outside the dewatering pipe; welding a water stopping wing on the outer wall of the steel sleeve in a full seam mode, wherein the water stopping wing is a circular flat plate surrounding the steel sleeve, and the water stopping wing annularly protrudes out of the outer wall of the steel sleeve; concrete is poured outside the steel sleeve to form a bottom plate, and the water stop wing is enclosed in the bottom plate when the concrete is poured; pumping out the downcomer upwards, wherein the steel sleeve is of a hollow structure, injecting a backfill material into the steel sleeve, welding the full seam at the top end of the steel sleeve, and sealing the top end of the steel sleeve; according to the well sealing method of the dewatering well, the steel sleeve with larger size is sleeved outside the dewatering pipe, the dewatering pipe can be pulled out, the length of the steel sleeve is far smaller than that of the dewatering pipe, material waste when the dewatering well is sealed is reduced, and cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1A is a front view structural diagram of a normal working state of a downcomer;
FIG. 1B is a top view structural diagram of the normal working state of the downcomer;
FIG. 2A is a front view structural view of the exterior of the downcomer sleeved with a steel sleeve;
FIG. 2B is a top view structural diagram of the external sleeved steel sleeve of the downcomer;
fig. 3 is a front view structural view of a steel casing filled with a backfill material.
The figure includes:
steel casing 1, downcomer 2, stagnant water wing 3, bottom plate 4.
Detailed Description
The core of the invention is to provide a well plugging method for a dewatering well, which adopts a steel sleeve to replace a dewatering pipe and can reduce material waste.
In order to make the technical scheme of the invention better understood by those skilled in the art, the method for sealing a dewatering well according to the invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1A and fig. 1B, a front view structural diagram and a top view structural diagram of the normal working state of the downcomer 2 are respectively shown; the downcomer 2 is a mesh pipeline with filtering through holes on the pipe wall, and a filtering layer is arranged on the periphery of the downcomer.
The invention provides a well plugging method for a dewatering well, which comprises the following steps:
s1, inserting a steel sleeve 1 on the ground, and sleeving the steel sleeve 1 outside the downcomer 2; as shown in fig. 2A and 2B, a front view structural view and a plan view structural view of the exterior of the downcomer 2 to which the steel casing 1 is fitted are respectively configured such that the inner diameter of the steel casing 1 is larger than the outer diameter of the downcomer 2 and the downcomer 2 can be circumferentially surrounded by the steel casing 1.
S2, welding the water stopping wing 3 on the outer wall of the steel sleeve 1 in a full seam mode, wherein the water stopping wing 3 is a circular flat plate surrounding the steel sleeve 1; the water stopping wing 3 is of an annular sheet structure protruding out of the outer surface of the steel sleeve 1, the contact area between the water stopping wing and the concrete bottom plate 4 is increased, and meanwhile, a straight-through upper gap and a straight-through lower gap between the steel sleeve and the concrete bottom plate due to expansion caused by heat and contraction caused by cold are avoided. The welding seam between the water-stop wing 3 and the steel sleeve 1 is full without a gap, thereby playing a role of water resistance.
S3, pouring concrete outside the steel sleeve 1 to form a bottom plate 4, and enclosing the water stop wing 3 in the bottom plate 4; before the bottom plate 4 is poured, a cushion layer is firstly paved on the ground, concrete is poured on the cushion layer to form the bottom plate 4, the concrete is in contact with the outer side wall of the steel sleeve 1, the concrete is prevented from being in direct contact with a downcomer, and therefore the length of the steel sleeve 1 is larger than the thickness of the bottom plate 4.
S4, pumping out the downcomer 2 upwards; after the concreting meets the requirement, the precipitation pipe enclosed in the steel sleeve 1 is upwards drawn out along the vertical direction, and the precipitation pipe is not contacted with the concrete, so the precipitation pipe is not influenced by the concrete and can be conveniently drawn out upwards.
S5, injecting a backfill material into the steel sleeve 1, and welding the top end of the steel sleeve 1 with full seam; as shown in fig. 3, a front view structural view of the steel casing 1 filled with the backfill material is shown; after the downcomer 2 is drawn out, the inner cavity of the steel sleeve 1 is hollow, corresponding materials need to be filled in the steel sleeve 1 for preventing upward water seepage from the steel sleeve 1, the steel sleeve is sealed, when the steel sleeve is filled in the steel sleeve to be close to the top end, a steel plate is welded on the upper surface of the steel sleeve 1, and a welding seam is arranged on the contact part of the steel plate and the steel sleeve 1, so that a water-resisting effect is guaranteed.
The plugging process of the dewatering well is completed according to the steps, the steel sleeve 1 with larger size is sleeved outside the dewatering pipe 2, the dewatering pipe 2 can be drawn out, the steel sleeve 1 only acts as a barrier concrete and avoids the influence on the dewatering pipe after the concrete is solidified, therefore, the length of the steel sleeve 1 only needs to be larger than the thickness of the bottom plate 4, the length of the steel sleeve 1 is far smaller than that of the dewatering pipe 2, the material waste when the dewatering well is sealed is reduced, and the cost is reduced. In addition, as the water stopping wing 3 is welded on the outer side wall of the steel sleeve 1, the steel sleeve 1 is made of a thicker material, and the downcomer 2 can drain water, so that the downcomer 2 can be made of a pipeline with a thinner pipe wall; the traditional construction method needs to weld the water stopping wings on the downcomer, so that the traditional downcomer is thick in material, and the scheme can reduce the material consumption of the downcomer.
On the basis of any technical scheme, the water stop wing 3 is provided with two water stop wings, the two water stop wings are the same in size and shape, and the arrangement positions are not different, for example: the upper water stopping wing 3 is positioned 150mm below the top surface of the bottom plate, and the lower water stopping wing is positioned 200mm above the bottom surface of the bottom plate. Each water wing 3 is made of two semi-annular thin plates, and the two semi-annular thin plates are spliced to form a whole circular thin plate during welding.
In order to further increase the waterproof effect, the steel sleeve 1 is wound with the hemp threads, the hemp threads enable mixed gaps to be formed between the steel sleeve 1 and the concrete, the gaps on the outer surface of the steel sleeve 1 are not straight up and down, and the waterproof effect is further improved.
Specifically, the bottom end of the steel sleeve 1 extends to the lower surface of the bottom plate 4, the top end of the steel sleeve 1 extends to the upper surface of the bottom plate 4, namely the steel sleeve 1 is inserted to the lower part of the cushion layer, and when the concrete bottom plate 4 is poured, the upper surface of the bottom plate 4 is lower than the top end of the steel sleeve 1.
The upper surface of the bottom plate 4 is required to be flat, so that the steel sleeve 1 is cut after the bottom plate 4 is poured, and the top end of the steel sleeve 1 is positioned below the upper surface of the bottom plate 4; the cutting machine extends into the steel sleeve 1, the steel sleeve is cut off along the circumferential direction, the height of the top end of the cut steel sleeve is lower than that of the upper surface of the bottom plate 4, and a cylindrical cavity is formed between the upper surface of the bottom plate 4 and the top end of the steel sleeve.
Step S5, injecting a backfill material into the steel casing 1, specifically including the following steps:
backfilling the bottom of the cushion layer below the bottom plate 4 by using medium coarse sand below 1m, and pouring high-grade plain concrete higher than the bottom plate concrete by one grade to a position 100mm below the top surface of the bottom plate; that is, the steel casing 1 is filled with coarse sand, and the grade of the concrete filled above the coarse sand is higher than that of the concrete poured on the bottom plate.
Each dewatering well adopts the plugging method, a plurality of dewatering wells are arranged on the ground, and each dewatering well is plugged by adopting an interval plugging method:
plugging the dewatering wells in a working state at intervals; namely, one part of the dewatering well is plugged, and the other part of the dewatering well still works normally. If the ground water level is higher, a small amount of plugging can be performed, and if the ground water level is lower, more dewatering wells can be plugged.
After the dewatering wells are plugged at intervals, the working states of the dewatering wells which are not plugged are continuously observed, wherein the working states comprise water yield conditions, water level change values, stable water level elevation and water pump position elevation; if all indexes are still stable after partial plugging, normal construction can be carried out.
Judging whether one of the following three precondition conditions is satisfied, if yes, plugging the residual dewatering wells one by one:
the construction of the bottom plate 4 is completed; and after the construction of the bottom plates of all the construction sections is completed, other residual dewatering wells can be plugged one by one.
Or, the anti-floating requirement of the main structure is met; after the main structure is constructed to have enough volume, the buoyancy of water resistance can be resisted, and then subsequent construction can not be influenced by underground water, and other residual dewatering wells can be plugged one by one.
Or the stable water level in the dewatering wells in the foundation pit is 1-2 m below the surface of the foundation pit, and the underground water does not influence the construction on the ground when the water level of the underground water is lower than the surface of the foundation pit, so that other residual dewatering wells can be plugged one by one.
Before the cushion layer below the bottom plate 4 is poured, the outer wall of the concrete filter tube of the dewatering well below the cushion layer is firstly removed.
When the bottom plate 4 is manufactured, reinforcing steel bars need to be bound in advance, when the bottom plate reinforcing steel bars meet the steel sleeve, the reinforcing steel bars can bypass from the periphery, but four reinforcing steel bars with the same diameter are additionally added, one end of each reinforcing steel bar is bent by 250mm and welded with the steel sleeve, and the horizontal length of the other end of each reinforcing steel bar is not less than 1.0 m.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A well plugging method for a dewatering well is characterized by comprising the following steps:
the method comprises the following steps that a steel sleeve (1) is inserted on the ground, and the steel sleeve (1) is sleeved outside a downcomer (2);
welding a water stopping wing (3) on the outer wall of the steel sleeve (1) in a full seam mode, wherein the water stopping wing (3) is a circular flat plate surrounding the steel sleeve (1);
pouring concrete outside the steel sleeve (1) to form a bottom plate (4), wherein the water-stop wing (3) is enclosed in the bottom plate (4);
the downcomer (2) is drawn out upwards;
and (3) injecting a backfill material into the steel sleeve (1), and welding the top end of the steel sleeve (1) in a full seam mode.
2. The dewatering well shut-in method according to claim 1, characterized in that the water-stop wing (3) is provided with two passages.
3. The well plugging method of dewatering well according to claim 2, characterized in that hemp thread is wound outside the steel casing (1).
4. The well plugging method of dewatering well according to claim 1, characterized in that the bottom end of the steel casing (1) extends below the lower surface of the bottom plate (4) and the top end of the steel casing (1) extends above the upper surface of the bottom plate (4).
5. The well plugging method of dewatering well according to claim 4, characterized in that the steel casing (1) is cut after the bottom plate (4) is poured, so that the top end of the steel casing (1) is below the upper surface of the bottom plate (4).
6. The well plugging method of dewatering well according to claim 1, wherein the injecting backfill material into the steel casing (1) comprises:
and the bottom elevation of the cushion layer below the bottom plate (4) is backfilled by medium coarse sand below 1m, and then high-grade plain concrete higher than the bottom plate concrete by one grade is poured to the position 100mm below the top surface of the bottom plate.
7. The well plugging method of dewatering well as claimed in any one of claims 1 to 6, wherein each dewatering well is plugged by interval plugging method:
plugging the dewatering wells in a working state at intervals;
after the dewatering wells are plugged at intervals, the working states of the dewatering wells which are not plugged are continuously observed, wherein the working states comprise water yield conditions, water level change values, stable water level elevation and water pump position elevation;
judging whether one of the following three precondition conditions is satisfied, if yes, plugging the residual dewatering wells one by one:
the construction of the bottom plate (4) is completed;
or, the anti-floating requirement of the main structure is met;
or the stable water level in the dewatering well in the foundation pit is 1-2 m below the surface of the foundation pit.
8. A method for sealing a well as claimed in claim 7, characterized in that the outer wall of the concrete filter tube of the dewatering well below the bedding layer is first removed before the bedding layer below the bottom plate (4) is poured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911222834.6A CN110820781A (en) | 2019-12-03 | 2019-12-03 | Well plugging method for dewatering well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911222834.6A CN110820781A (en) | 2019-12-03 | 2019-12-03 | Well plugging method for dewatering well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110820781A true CN110820781A (en) | 2020-02-21 |
Family
ID=69542303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911222834.6A Pending CN110820781A (en) | 2019-12-03 | 2019-12-03 | Well plugging method for dewatering well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110820781A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112411588A (en) * | 2020-11-10 | 2021-02-26 | 上海建工七建集团有限公司 | Water seepage prevention device for dewatering well and construction method |
| CN114718099A (en) * | 2022-03-21 | 2022-07-08 | 中国五冶集团有限公司 | Well plugging device for dewatering well |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4260334A (en) * | 1976-02-11 | 1981-04-07 | Kelley Contract Dewatering Company | Ground dewatering system |
| CN202450536U (en) * | 2011-12-29 | 2012-09-26 | 青岛新华友建工集团股份有限公司 | Shallow dewatering and plugging construction device in foundation pit |
| CN108867676A (en) * | 2018-07-19 | 2018-11-23 | 江苏南通三建集团股份有限公司 | A kind of shut off tool and its construction method at round sump foundation pit bottom |
-
2019
- 2019-12-03 CN CN201911222834.6A patent/CN110820781A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4260334A (en) * | 1976-02-11 | 1981-04-07 | Kelley Contract Dewatering Company | Ground dewatering system |
| CN202450536U (en) * | 2011-12-29 | 2012-09-26 | 青岛新华友建工集团股份有限公司 | Shallow dewatering and plugging construction device in foundation pit |
| CN108867676A (en) * | 2018-07-19 | 2018-11-23 | 江苏南通三建集团股份有限公司 | A kind of shut off tool and its construction method at round sump foundation pit bottom |
Non-Patent Citations (1)
| Title |
|---|
| 王春等: "《深基坑工程降水技术研究与实践》", 30 September 2016, 山东大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112411588A (en) * | 2020-11-10 | 2021-02-26 | 上海建工七建集团有限公司 | Water seepage prevention device for dewatering well and construction method |
| CN114718099A (en) * | 2022-03-21 | 2022-07-08 | 中国五冶集团有限公司 | Well plugging device for dewatering well |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105951880A (en) | Assembled underground structure of precast concrete planks and construction method thereof | |
| CN107326918B (en) | Hidden type plugging impervious water collecting well penetrating through raft plates and construction process thereof | |
| CN109736340B (en) | Dewatering device and method for guaranteeing integrity of cushion layer by reserving dewatering well on foundation slab | |
| CN204530733U (en) | Underground construction deep-well precipitation well head plugging structure | |
| CN110820781A (en) | Well plugging method for dewatering well | |
| CN103133004B (en) | Technological process of ground prefabrication and installation of inner shaft wall of freezing shaft | |
| CN105484277A (en) | Component for tubular well precipitation construction in elevator foundation pit or sump and construction method | |
| CN109723071B (en) | Construction method of double-layer steel drum drainage system built in basement floor post-cast strip | |
| CN205205844U (en) | Member is used in construction of tubular well precipitation in elevator foundation ditch or sump pit | |
| CN111456056A (en) | Construction method of dewatering well in deep foundation pit | |
| CN111424697A (en) | Construction method for prefabricating deep and large open caisson by slicing | |
| CN106088758A (en) | A kind of double-deck assembled underground granary | |
| CN214784092U (en) | Foundation ditch relief well enclosed construction | |
| CN205591210U (en) | Formula cast member and construction assembly are spliced to underground | |
| CN115478533A (en) | PHC pipe pile core pouring method under confined water condition | |
| CN106088762A (en) | The prefabricated assembled circular underground granary of a kind of insertion slot type encased steel plate | |
| CN203668912U (en) | Structure for embedding drain pipe in concrete | |
| CN102936893A (en) | Construction method for improving waterproof effect of land-wall-connection tenon type joint | |
| CN106567397A (en) | Method and device for controlling underground water of deep foundation pit | |
| CN206279522U (en) | Ground-connecting-wall steel reinforcement cage | |
| CN216788363U (en) | Well head block structure of deep tube well | |
| CN220667564U (en) | Cave door reinforcing structure with jacking pipe penetrating through micro confined aquifer | |
| CN214695683U (en) | Raft board precipitation well structure | |
| CN216765995U (en) | Prefabricated inspection shaft construction structures of assembling of assembled components of a whole that can function independently | |
| CN114703830B (en) | Karst development site engineering filling pile water burst prevention construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200221 |