CN106522252A - Seepage-proofing blocking mechanism and method for deep foundation pit raft dewatering well - Google Patents
Seepage-proofing blocking mechanism and method for deep foundation pit raft dewatering well Download PDFInfo
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- CN106522252A CN106522252A CN201611113125.0A CN201611113125A CN106522252A CN 106522252 A CN106522252 A CN 106522252A CN 201611113125 A CN201611113125 A CN 201611113125A CN 106522252 A CN106522252 A CN 106522252A
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- seal ring
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- steel thimble
- raft
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 74
- 239000010959 steel Substances 0.000 claims abstract description 74
- 239000000463 material Substances 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 8
- 230000010412 perfusion Effects 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 4
- 230000015271 coagulation Effects 0.000 claims description 3
- 238000005345 coagulation Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 12
- 238000001556 precipitation Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000003673 groundwater Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 241000521257 Hydrops Species 0.000 description 1
- 206010030113 Oedema Diseases 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Revetment (AREA)
Abstract
The invention discloses a seepage-proofing blocking mechanism and method for a deep foundation pit raft dewatering well. Through the seepage-proofing blocking mechanism and method, the problem of poor blocking and sealing performance of deep foundation pit raft dewatering wells in the prior art is solved. According to the seepage-proofing blocking mechanism, two outer waterstop rings are arranged on the outer sidewall of a steel sleeve (5), and two inner waterstop rings are arranged in the middle of the inner sidewall of the steel sleeve (5); in-well backfill gravels (14) are arranged in a dewatering well casing (4); lower waterproof concrete (15) is arranged in the part, under a round blocking cover plate (13), of the steel sleeve (5), and upper waterproof concrete (16) is arranged in the part, above the round blocking cover plate (13), of the steel sleeve (5); and the first outer waterstop ring (6) is arranged in a raft foundation concrete cushion (2), and the first inner waterstop ring (9) is arranged in the lower waterproof concrete (15). The seepage-proofing blocking mechanism is good in waterproof effect. Multiple waterproof structural measures are adopted, and the waterproof effect of a concrete floor can be guaranteed.
Description
Technical field
The present invention relates to a kind of plugging mechanism of the dewatering well being arranged on deep basal pit raft foundation, more particularly to a kind of energy
The antiseep plugging mechanism of the dewatering well being effectively sealing off on deep basal pit raft foundation and its method for blocking.
Background technology
With the Devoting Major Efforts To Developing of the fast-developing and underground space of urban construction, skyscraper is more and more.Build in high level
In the construction built, typically before deep pit digging, dewatering well is just provided with the ground, the drop of level of ground water at foundation ditch is carried out
It is low, and continuous drawing discharge is carried out to the water in dewatering well by drinking-water pipe；After level of ground water drops to designed elevation, construction is opened
Foundation ditch is dug, during whole construction and excavation, precipitation is persistently carried out.After the completion of excavation of foundation pit, start in construction foundation pit
Basic sand-gravel cushion and concrete cushion, waterproof steel bushing will be set in base concrete bed course, above-mentioned drinking-water pipe is just
It is that ground is led to by waterproof steel bushing, the raft board concrete base of skyscraper then, is constructed on base concrete bed course
Plinth layer, constructs skyscraper main body afterwards on raft board concrete basal layer；Finally, after the completion of structures main body, be to drop
Well is blocked.Existing plugging dewatering well method is：Sandstone siccative is inserted in dewatering well first, blinding layer bottom is filled to
Position, then pours water-proof concrete in pre-buried waterproof steel bushing, and uses blind flange in the upper port of waterproof steel bushing
Welding closure.There is the defect of sealing difference in this method for blocking, can occur infiltration phenomenon on raft board concrete basal layer.It is former
Because being：After the water-proof concrete in waterproof steel bushing solidifies, it may occur that shrink, make the inwall and anti-water coagulation of waterproof steel bushing
Gap is formed between soil, after dewatering well rising of groundwater level, can be oozed out from the gap, be entered into raft plate top, can also when serious
There are hydrops, badly influenced the safe handling of skyscraper.When there is infiltration phenomenon, existing processing method is to drop
Well carries out slip casting, implements secondary plugging, and secondary plugging can cause construction cost to increase, and plugging effect is not good enough.
The content of the invention
The invention provides on a kind of deep basal pit raft plate dewatering well water-impervious plugging mechanism and its method for blocking, solve
The technical problem of the closure sealing difference of the deep basal pit raft plate dewatering well that prior art is present.
The present invention is to solve above technical problem by the following technical programs：
The water-impervious plugging mechanism of dewatering well on a kind of deep basal pit raft plate, including dewatering well well casing and steel thimble, steel thimble are sets
It is connected in the upper port of dewatering well well casing, raft foundation concrete cushion is provided with the outside of steel thimble and raft foundation is mixed
Solidifying soil layer, is provided with first outer seal ring in the lateral wall lower end of steel thimble, and is provided with the middle part of the lateral wall of steel thimble
Seal ring outside two roads, is provided with seal ring in first in the middle part of the medial wall of steel thimble, seal ring and steel bushing in first
Seal ring in second is provided between the upper port of pipe, capping spiral shell is provided with seal ring in second at equal intervals radian
Bolt passes through hole, and capping bolt is upwards passed capping bolt by the lower section in hole from capping bolt and passed through by Kong Houyu capping bolts
Eyelet welding is connected together, and is provided with capping bolt through hole in closure circular cover, and closure circular cover is arranged in second
Above seal ring, cover bolt and pass through the capping bolt arranged in closure circular cover to be spirally connected through Kong Houyu capping bolt and nuts
Together；It is provided with dewatering well well casing in well and backfills sandstone, under is provided with the steel thimble below closure circular cover
Water-proof concrete, is provided with water-proof concrete in the steel thimble above closure circular cover, and first outer seal ring is to set
Put in raft foundation concrete cushion, in first, seal ring is provided in lower water-proof concrete.
Rubber washer is being provided between seal ring in closure circular cover and second, in raft foundation concrete cushion
Waterproof loop material is provided with the lateral wall of the steel thimble of top.
On a kind of deep basal pit raft plate, the water-impervious method for blocking of dewatering well, comprises the following steps：
The first step, first outer seal ring is set in the lateral wall lower end of steel thimble, the is arranged in the middle part of the lateral wall of steel thimble
Seal ring outside two roads, arranges seal ring in first in the middle part of the medial wall of steel thimble, seal ring and steel thimble in first
Upper port between arrange second in seal ring, on seal ring in second at equal intervals radian arrange capping bolt pass through
Capping bolt is upwards passed capping bolt by hole after by the lower section in hole from capping bolt by hole, and is passed through with capping bolt
Eyelet welding is connected together, and is correspondingly arranged capping bolt and passes through hole in closure circular cover；
Second step, when in deep basal pit valve plate basis sand-gravel cushion after the completion of, the steel thimble that the first step is made is socketed in into drop
In the upper port of well well casing, raft foundation concrete cushion is then constructed, make first outer seal ring be arranged on raft foundation
In concrete cushion；
Waterproof loop material is provided with 3rd step, the lateral wall of steel thimble above raft foundation concrete cushion, is then constructed
Raft foundation concrete layer；
4th step, after the completion of structures main body, in dewatering well well casing backfill well in backfill sandstone siccative, in steel thimble fill
Water-proof concrete is poured down to seal ring in second；
5th step, will closure circular cover cover in second on seal ring, capping bolt through closure circular cover on arrange
Capping bolt through Kong Houyu capping bolt and nut be screwed together；
6th step, closure circular cover on perfusion on water-proof concrete.
The steel thimble seal ring of the present invention should select the steel plate not less than 6 millimeters thicks to process, and sealing ring width is not less than 50
Millimeter.
Present invention is especially suited for deep foundation pit precipitation well postpones the situation of shut-in well；The waterproof and plugging construction of precipitation well in foundation pit
Method is easy, and operator are not required to carry out professional training, and common laborer can complete, and speed of application is fast, does not affect other operations
Construction, nor affect on construction speed；Using material be construction in common used material, the cost of material is low, and its cost is at a fairly low
It is honest and clean；Good water-proof effect, employs multi layer waterproof construction measure, can guarantee that the waterproof effect of concrete floor.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of the steel thimble 5 of the present invention.
Specific embodiment
The present invention is described in detail below in conjunction with the accompanying drawings：
The water-impervious plugging mechanism of dewatering well on a kind of deep basal pit raft plate, including dewatering well well casing 4 and steel thimble 5, steel thimble 5 is
It is socketed in the upper port of dewatering well well casing 4, the outside of steel thimble 5 is provided with raft foundation concrete cushion 2 and raft plate
Base concrete layer 3, is provided with first outer seal ring 6 in the lateral wall lower end of steel thimble 5, in the lateral wall of steel thimble 5
Portion is provided with the outer seal ring 7 of second, is provided with seal ring 9 in first, in first in the middle part of the medial wall of steel thimble 5
Seal ring 10 in second are provided between the upper port of seal ring 9 and steel thimble 5, on seal ring 10 in second at equal intervals
Capping bolt is provided with by hole, capping bolt 11 upwards passes capping bolt by the lower section in hole from capping bolt and leads to radian
It is connected together by eyelet welding with capping bolt after via, capping bolt is provided with closure circular cover 13 through hole, closure
Circular cover 13 is arranged in second above seal ring 10, covers the capping that bolt 11 is arranged through in closure circular cover 13
Bolt is screwed together through Kong Houyu capping bolt and nuts；Backfill sandstone 14 in well is provided with dewatering well well casing 4, in envelope
Lower water-proof concrete 15 is provided with steel thimble 5 below stifled circular cover 13, the steel thimble 5 above closure circular cover 13
In be provided with water-proof concrete 16, first outer seal ring 6 is provided in raft foundation concrete cushion 2, first
Interior seal ring 9 is provided in lower water-proof concrete 15.
Rubber washer 12 is being provided between seal ring 10 in closure circular cover 13 and second, in raft foundation coagulation
Waterproof loop material 8 is provided with the lateral wall of the steel thimble 5 above soil padding 2.
On a kind of deep basal pit raft plate, the water-impervious method for blocking of dewatering well, comprises the following steps：
The first step, first outer seal ring 6 is set in the lateral wall lower end of steel thimble 5, the setting in the middle part of the lateral wall of steel thimble 5
The outer seal ring 7 of second, arranges seal ring 9 in first in the middle part of the medial wall of steel thimble 5, in first seal ring 9 with
Seal ring 10 in second is set between the upper port of steel thimble 5, is arranged on seal ring 10 in second at equal intervals radian
Capping bolt 11 is upwards passed capping bolt by hole after by the lower section in hole from capping bolt by hole by capping bolt, and
It is connected together by eyelet welding with capping bolt, capping bolt is correspondingly arranged in closure circular cover 13 and passes through hole；
Second step, when in deep basal pit valve plate basis sand-gravel cushion 1 after the completion of, the steel thimble 5 that the first step is made is socketed in
In the upper port of dewatering well well casing 4, raft foundation concrete cushion 2 is then constructed, make first outer seal ring 6 be arranged on raft plate
In base concrete bed course 2；
Waterproof loop material 8 is provided with 3rd step, the lateral wall of steel thimble 5 above raft foundation concrete cushion 2, then structure
Build raft foundation concrete layer 3；
4th step, after the completion of structures main body, in dewatering well well casing 4 backfill well in backfill sandstone 14, in steel thimble 5 fill
Water-proof concrete 15 is poured down to seal ring in second 10；
5th step, will closure circular cover 13 cover in second on seal ring 10, capping bolt 11 through closure circular cover
The capping bolt arranged on 13 is screwed together through Kong Houyu capping bolt and nuts；
6th step, closure circular cover 13 on perfusion on water-proof concrete 16.
Steel thimble is processed before base concrete cushion construction, steel thimble is made using hot rolled seamless steel tube, and steel thimble 5 will
10 centimetres are higher by than raft foundation concrete layer 3, seal ring adopts two-sided welding with steel thimble, to ensure its sealing.Applying
During work raft foundation concrete cushion 2, steel thimble 5 is embedded in raft foundation concrete cushion 2 in advance, dewatering pump is passed through into steel bushing
Pipe 5 carries out precipitation.When precipitation can be stopped, dewatering pump is taken out, precipitation bottom is backfilled using sandstone 14, sandstone 14
Sole plate bottom is filled to, is then poured to sleeve pipe at second seal ring 10 using waterproof expansive concrete, second
Rubber seal is added to be blocked using blind flange at seal ring 10 in road, building waterproofing expansive concrete is poured on upper strata.
Method for blocking：Cement, sand, rubble are pressed 2 first：2：1 ratio stirs by well head（Whole siccatives）,
The water in dewatering well is all evacuated before feeding intake, quickly water pump is proposed, and in siccative launching trap, siccative is filled to raft plate bottom
Portion, raft plate bottom are poured toward up to raft top of the plate using waterproof expansive concrete, and twice seal ring on the inside of sleeve pipe is poured into wherein.
Size and bolt eye in second at seal ring according to pipe flange cover plate makes rubber washer, and rubber washer thickness is 10 millis
Rice, on the capping bolt 11 that the rubber washer made in advance is inserted in steel thimble, places into closure circular cover 13, with set
Barrel spanner symmetrically staggeredly tightens capping bolt and nut.Ensure that sealing is tight, it is air tight.To clean out in steel thimble 5, on cover plate
Building waterproofing expansive concrete is poured in portion, concrete is shaken and densification reality is conserved.So twice waterproof layer is also formed on the inside of steel bushing,
Prevent the spilling of subsoil water in well.
Claims (3)
1. on a kind of deep basal pit raft plate dewatering well water-impervious plugging mechanism, including dewatering well well casing（4）And steel thimble（5）, steel
Sleeve pipe（5）It is to be socketed in dewatering well well casing（4）Upper port on, in steel thimble（5）Outside be provided with raft foundation coagulation
Soil padding（2）With raft foundation concrete layer（3）, it is characterised in that in steel thimble（5）Lateral wall lower end be provided with first
Outer seal ring（6）, in steel thimble（5）Lateral wall in the middle part of be provided with the outer seal ring of second（7）, in steel thimble（5）Inner side
Seal ring in first is provided with the middle part of wall（9）, the seal ring in first（9）With steel thimble（5）Upper port between arrange
There is seal ring in second（10）, the seal ring in the second（10）On be provided with capping bolt at equal intervals by hole radian,
Capping bolt（11）Capping bolt is passed upwards by the lower section in hole from capping bolt bolt is covered by eyelet welding by Kong Houyu
It is connected together, in closure circular cover（13）On be provided with capping bolt through hole, block circular cover（13）It is arranged on second
Seal ring in road（10）Above, cover bolt（11）Through closure circular cover（13）The capping bolt of upper setting passes through Kong Houyu
Capping bolt and nut is screwed together；In dewatering well well casing（4）In be provided with backfill sandstone in well（14）, in closure circular cover
（13）The steel thimble of lower section（5）In be provided with lower water-proof concrete（15）, in closure circular cover（13）The steel thimble of top（5）
In be provided with water-proof concrete（16）, first outer seal ring（6）It is provided in raft foundation concrete cushion（2）In,
Seal ring in first（9）It is provided in lower water-proof concrete（15）In.
2. on a kind of deep basal pit raft plate according to claim 1 dewatering well water-impervious plugging mechanism, it is characterised in that
Closure circular cover（13）With seal ring in second（10）Between be provided with rubber washer（12）, in raft foundation concrete mats
Layer（2）The steel thimble of top（5）Lateral wall on be provided with waterproof loop material（8）.
3. on a kind of deep basal pit raft plate dewatering well water-impervious method for blocking, comprise the following steps：
The first step, in steel thimble（5）Lateral wall lower end arrange first outer seal ring（6）, in steel thimble（5）Lateral wall in
Portion arranges the outer seal ring of second（7）, in steel thimble（5）Medial wall in the middle part of arrange first in seal ring（9）, at first
Interior seal ring（9）With steel thimble（5）Upper port between arrange second in seal ring（10）, the seal ring in the second（10）
On at equal intervals radian ground capping bolt is set by hole, bolt will be covered（11）Passed from capping bolt upwards by the lower section in hole
Capping bolt is behind hole, and is connected together by eyelet welding with capping bolt, in closure circular cover（13）On be correspondingly arranged envelope
Bonnet bolt passes through hole；
Second step, when in deep basal pit valve plate basis sand-gravel cushion（1）After the completion of, the steel thimble that the first step is made（5）Set
It is connected on dewatering well well casing（4）Upper port on, then construct raft foundation concrete cushion（2）, make first outer seal ring（6）
It is arranged on raft foundation concrete cushion（2）In；
3rd step, in raft foundation concrete cushion（2）The steel thimble of top（5）Lateral wall on be provided with waterproof loop material（8）,
Then construct raft foundation concrete layer（3）；
4th step, after the completion of structures main body, in dewatering well well casing（4）Backfill sandstone in middle backfill well（14）, in steel thimble
（5）Water-proof concrete under middle perfusion（15）The seal ring to second（10）；
5th step, circular cover will be blocked（13）Cover the seal ring in second（10）On, cover bolt（11）Through closure circle
Shape cover plate（13）The capping bolt of upper setting is screwed together through Kong Houyu capping bolt and nuts；
6th step, closure circular cover（13）Water-proof concrete in upper perfusion（16）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611113125.0A CN106522252A (en) | 2016-12-07 | 2016-12-07 | Seepage-proofing blocking mechanism and method for deep foundation pit raft dewatering well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611113125.0A CN106522252A (en) | 2016-12-07 | 2016-12-07 | Seepage-proofing blocking mechanism and method for deep foundation pit raft dewatering well |
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| Publication Number | Publication Date |
|---|---|
| CN106522252A true CN106522252A (en) | 2017-03-22 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611113125.0A Pending CN106522252A (en) | 2016-12-07 | 2016-12-07 | Seepage-proofing blocking mechanism and method for deep foundation pit raft dewatering well |
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| Country | Link |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106948237A (en) * | 2017-03-29 | 2017-07-14 | 浙江环宏市政建设有限公司 | Road and its construction method with sump |
| CN107100181A (en) * | 2017-05-09 | 2017-08-29 | 黄坤坤 | " being cheated in hole " two grades of relay precipitation systems and its method for blocking |
| CN109024640A (en) * | 2018-08-10 | 2018-12-18 | 中建局集团建设发展有限公司 | One kind closing water valve device, shut-in well structure and its construction method |
| CN109653228A (en) * | 2019-01-25 | 2019-04-19 | 沙俊强 | A kind of underwater composite water-stop casing bit |
| CN110331731A (en) * | 2019-06-27 | 2019-10-15 | 甘肃第七建设集团股份有限公司 | A kind of precipitation well in foundation pit herringbone bridging seal ring precipitation sleeve burial and construction method |
| CN111042212A (en) * | 2019-12-23 | 2020-04-21 | 上海建工七建集团有限公司 | Rear-mounted thin-wall steel pipe water draining device and method for large bottom plate anti-floating |
| CN113482025A (en) * | 2021-07-15 | 2021-10-08 | 海通建设集团有限公司 | Deep foundation pit dewatering well plugging structure and construction method thereof |
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| SU1348452A1 (en) * | 1986-02-06 | 1987-10-30 | Украинский Государственный Институт По Проектированию Металлургических Заводов | Water level lowering well |
| CN101148884A (en) * | 2007-10-30 | 2008-03-26 | 山东天齐置业集团股份有限公司 | Waterproof and plugging construction method for precipitation well in foundation pit |
| CN201172828Y (en) * | 2008-03-19 | 2008-12-31 | 山西第六建筑有限公司 | Well-covering device for dewatering well |
| CN103334444A (en) * | 2013-07-09 | 2013-10-02 | 中国一冶集团有限公司 | Decompression type blocking method for foundation pit dewatering well |
| CN206385557U (en) * | 2016-12-07 | 2017-08-08 | 山西省第三建筑工程公司 | The water-impervious plugging mechanism of dewatering well on deep basal pit raft plate |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1348452A1 (en) * | 1986-02-06 | 1987-10-30 | Украинский Государственный Институт По Проектированию Металлургических Заводов | Water level lowering well |
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| CN103334444A (en) * | 2013-07-09 | 2013-10-02 | 中国一冶集团有限公司 | Decompression type blocking method for foundation pit dewatering well |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106948237A (en) * | 2017-03-29 | 2017-07-14 | 浙江环宏市政建设有限公司 | Road and its construction method with sump |
| CN107100181A (en) * | 2017-05-09 | 2017-08-29 | 黄坤坤 | " being cheated in hole " two grades of relay precipitation systems and its method for blocking |
| CN109024640A (en) * | 2018-08-10 | 2018-12-18 | 中建局集团建设发展有限公司 | One kind closing water valve device, shut-in well structure and its construction method |
| CN109653228A (en) * | 2019-01-25 | 2019-04-19 | 沙俊强 | A kind of underwater composite water-stop casing bit |
| CN110331731A (en) * | 2019-06-27 | 2019-10-15 | 甘肃第七建设集团股份有限公司 | A kind of precipitation well in foundation pit herringbone bridging seal ring precipitation sleeve burial and construction method |
| CN111042212A (en) * | 2019-12-23 | 2020-04-21 | 上海建工七建集团有限公司 | Rear-mounted thin-wall steel pipe water draining device and method for large bottom plate anti-floating |
| CN113482025A (en) * | 2021-07-15 | 2021-10-08 | 海通建设集团有限公司 | Deep foundation pit dewatering well plugging structure and construction method thereof |
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