CN103343543B - Foundation pit dewatering well pressure-reduction-type plugging method - Google Patents

Foundation pit dewatering well pressure-reduction-type plugging method Download PDF

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Publication number
CN103343543B
CN103343543B CN201310286045.5A CN201310286045A CN103343543B CN 103343543 B CN103343543 B CN 103343543B CN 201310286045 A CN201310286045 A CN 201310286045A CN 103343543 B CN103343543 B CN 103343543B
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China
Prior art keywords
well
dewatering
well casing
drainage
floral tube
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CN201310286045.5A
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Chinese (zh)
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CN103343543A (en
Inventor
黎明中
王健
罗劲
吴宗庆
吴林华
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中国一冶集团有限公司
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Priority to CN201310286045.5A priority Critical patent/CN103343543B/en
Publication of CN103343543A publication Critical patent/CN103343543A/en
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Abstract

The invention provides a foundation pit dewatering well pressure-reduction-type plugging method. The method comprises the following steps that (1) at least one water stop ring is arranged on the outer wall of a dewatering well pipe; (2) bottom plate concrete is poured on the outer wall of the well pipe; (3) after the bottom plate concrete of a basement reaches certain strength, unnecessary well pipes on the surface of a bottom plate are cut off, and a drainage floral tube is inserted in the lower portion of a well pipe; (4) when the well is plugged, a water pump in the dewatering well pipe is lifted out, a drainage pump is started to drain water, and well plugging materials are then filled in the dewatering pipe sequentially; (5) the drainage pump stops working, and a small amount of gushing water flows out of the floral tube by itself; (6) a mud jacking pump is started to press curing agents in the dewatering well pipe; (7) the opening of the well pipe is plugged through a cover plate, the periphery of the well pipe is plugged through high-strength concrete, and dewatering well plugging is finished. The foundation pit dewatering well pressure-reduction-type plugging method is particularly suitable for engineering such as a basement which is high in underground water level, large in the amount of gushing water and high in water-proof requirements, very wide in application range, high in construction efficiency, convenient to operate and good in water plugging effect, and ensures that a later-period is hardly affected.

Description

A kind of foundation pit dewatering well decompression type method for blocking
Technical field
The present invention relates to the foundation pit construction in structure foundation Foundation Design, particularly relate to a kind of foundation pit dewatering well decompression type method for blocking.
Background technology
At present, the foundation ditch of some super large ultra-deep, have underground water and rivers water system and contact abundant, dewatering well and pour in the features such as the water yield is large, speed is fast, shutoff is bad very easily produces piping or quicksand at well point place, produces destructive harm to foundation ditch.And underground water burst head is generally pushed down by the mode of medium coarse sand, clay ball, dry cement back pressure by existing plugging dewatering well method, be difficult to ensure sole plate keep dry environment prerequisite under carry out shutoff, large at groundwater run off, fireballing area of shoving is then more difficult completes shut-in well.
Prior art generally determines different method for blocking according to the size of groundwater run off, can after foundation pad construction when underground water is less, a shutoff part before construction of waterproof layer, the part of shutoff remainder again during sole plate concreting.When groundwater run off is larger, then the continuous pumpage when sole plate concreting, now can select different method for blocking as the case may be.Method for blocking conventional is at present after underplate concrete has been constructed, suction pump in dewatering well is proposed, rapid back-filling in layers medium coarse sand, clay ball etc., underground flood peak is pushed down, and then after the unnecessary well casing higher than base plate being cut off, with dry cement back pressure well casing, then use steel plate soldering and sealing well casing, and adopt high-strength grout to be filled to base surface.In the method practical operation complicated loaded down with trivial details, expend time in length, particularly high for groundwater table, the amount of gushing large, the fireballing Project Realization plugging effect that shoves is bad, this place's base plate of later stage often has seepage problem to need process.
Under such hydrogeological conditions, that must create a kind of distinctive shutoff way guarantee dewatering well high-quality and high-efficiency completes shut-in well.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of foundation pit dewatering well decompression type method for blocking completing shut-in well that can ensure dewatering well high-quality and high-efficiency.
The present invention for solving the problems of the technologies described above taked technical scheme is:
A kind of foundation pit dewatering well decompression type method for blocking, it is characterized in that, it comprises the following steps:
1) at least one seal ring is set at dewatering well well casing outer wall, described well casing is fixed;
2) at described well casing outer wall bottom board concrete;
3) after basement bottom board concrete reaches intensity, cut off unnecessary well casing on backplate surface, and insert a drainage floral tube to well casing bottom, the bottom sidewall of described drainage floral tube offers multiple through hole, the top of described drainage floral tube communicates with aqueduct, described aqueduct is connected with drainage pump, and the top of described drainage floral tube is provided with stop valve;
4) when concrete strength reaches more than 70% and the construction of foundation ditch internal construction meets and stops precipitation condition, shut-in well is started, suction pump in dewatering well well casing is proposed, start described drainage pump draining, shut-in well material is inserted successively in dewatering well well casing again, then fill up bottom base plate successively to well casing mouth of pipe position dry cement and pea gravel concreten;
5) drainage pump work can be stopped when the water yield in well casing is more and more less, allow a small amount of water burst flow out voluntarily from floral tube;
6) start mudjack curing compound is pressed in dewatering well well casing by described drainage floral tube, curing compound is infiltrated in the fill material in dewatering well, make this place's well head without till infiltration;
7) position of drainage floral tube being exposed backplate surface is cut off, and is shut by well casing mouth with cover plate, then uses around high-strength concrete shutoff well casing, so far completes the shutoff of dewatering well.
In such scheme, inserting sequentially for first to insert thick material of the shut-in well material in described step 4), then insert fine material, then insert bottom clay ball to base plate.
Compared with prior art, the technique effect that the present invention obtains is:
1, the present invention adopts special plugging dewatering well device, can effectively keep carrying out shut-in well construction in dry conditions.
2, the present invention is not only applicable to general underground structure construction, and be specially adapted to the engineerings such as the basement that groundwater table is high, water yield large, water proofing property requirement is higher, range of application widely.
3, compared with mode of in the past shunting in a well, efficiency of construction is high, easy to operate, and water sealing effect is good, and consequent effects is little.
Accompanying drawing explanation
The structural representation of the foundation pit dewatering well decompression type plugging device that Fig. 1 provides for the embodiment of the present invention.
Fig. 2 is the sectional view of the cover plate in Fig. 1.
Fig. 3 is the top view of the cover plate in Fig. 1.
Fig. 4 is the process schematic of the foundation pit dewatering well decompression type method for blocking that the embodiment of the present invention provides.
Fig. 5 is the process schematic of the foundation pit dewatering well decompression type method for blocking that the embodiment of the present invention provides.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described, and certain following embodiment should not be construed as limitation of the present invention.
Dewatering well well casing in the present embodiment is steel pipe.
As shown in Figure 1 to Figure 3, its a kind of foundation pit dewatering well decompression type plugging device provided for the present embodiment, it comprises drainage floral tube 1, the aqueduct 2 communicated with drainage floral tube 1 top, the cover plate 3 that is sheathed on drainage floral tube 1 outer wall.The top of drainage floral tube 1 is provided with stop valve 4.The bottom sidewall of drainage floral tube 1 offers multiple through hole 5.Drainage floral tube 1 is inserted into dewatering well well casing bottom.Cover plate 3 is for shutoff dewatering well well casing mouth.In the present embodiment, this plugging device also comprises the drainage pump 11 or mudjack 12 that are connected with aqueduct 2.
As shown in Fig. 4 to Fig. 5, the present invention also provides a kind of foundation pit dewatering well decompression type method for blocking, and it comprises the following steps:
1) two seal rings 8 are welded at dewatering well well casing 6 outer wall, the reinforcing bar of base arrangement colligation and steel well casing 6 are overlapped, and around well casing 6, reserve a groove 9, as the operating space of well casing shutoff, when underplate concrete is built, well casing 6 outer wall is shut;
2) at described well casing 6 outer wall bottom board concrete seven;
3) after basement bottom board concrete seven reaches intensity, cut off the unnecessary well casing of more than groove 9 bottom surface, and insert drainage floral tube 1 to well casing 6 bottom, the bottom sidewall of drainage floral tube 1 offers multiple through hole 5, and the top of drainage floral tube 1 communicates with aqueduct 2.The top of drainage floral tube 1 is provided with stop valve 4;
4) when concrete strength reaches more than 70% and the construction of foundation ditch internal construction meets and stops precipitation condition, shut-in well is started, suction pump (not shown) in dewatering well well casing 6 is proposed, start described drainage pump 11(to use when the water yield is larger) draining, the water of swarming in pipe is drained in time, shut-in well material is inserted successively in dewatering well well casing again, first insert thick material 13, insert fine material 14 again, bottom clay ball 15 to the base plate 7 inserting 2 meters of left and right thicknesses subsequently, finally after the mouth of pipe first inserts dry cement 16, insert pea gravel concreten 17 by bottom base plate 7 again;
5) drainage pump 11 can be stopped to work when the water yield in well casing is more and more less, allow a small amount of water burst flow out voluntarily from drainage floral tube 1;
6) close the stop valve 4 on drainage floral tube 1 top, aqueduct 2 is accessed mudjack 12.Open stop valve, can start mudjack 12 is pressed in dewatering well well casing 6 by curing compound such as cement grout, water glass liquid by drainage floral tube 1, curing compound is penetrated in the material gap of filling in dewatering well, to reach the closely knit effect of shut-in well, guarantees the water resistance of underground structure;
7) position 18 of drainage floral tube 1 being exposed bottom plate groove ground is cut off, the consolidation liquid at cleaning mouth of pipe place, with the cover plate 3 with well casing corresponding specification size, the welding of well casing mouth is shut.Again with bottom plate groove 9 reserved around high-strength concrete 19 shutoff well casing, so far complete the shutoff (as shown in Figure 5) of steel well casing dewatering well.
It should be noted that, those of ordinary skill in the art should be appreciated that and can modify to technical scheme of the present invention or equivalent replacement, and does not depart from aim and the scope of technical solution of the present invention, and it all should be encompassed in the middle of right of the present invention.

Claims (1)

1. a foundation pit dewatering well decompression type method for blocking, it is characterized in that, it comprises the following steps:
1) at least one seal ring is set at dewatering well well casing outer wall, described well casing is fixed;
2) at described well casing outer wall bottom board concrete;
3) after basement bottom board concrete reaches intensity, cut off unnecessary well casing on backplate surface, and insert a drainage floral tube to well casing bottom, the bottom sidewall of described drainage floral tube offers multiple through hole, the top of described drainage floral tube communicates with aqueduct, described aqueduct is connected with drainage pump, and the top of described drainage floral tube is provided with stop valve;
4) when concrete strength reaches more than 70% and the construction of foundation ditch internal construction meets and stops precipitation condition, shut-in well is started, suction pump in dewatering well well casing is proposed, start described drainage pump draining, shut-in well material is inserted successively in dewatering well well casing again, inserting sequentially as first to insert thick material of shut-in well material, insert fine material again, then insert bottom clay ball to base plate; Then fill up bottom base plate successively to well casing mouth of pipe position dry cement and pea gravel concreten;
5) drainage pump work can be stopped when the water yield in well casing is more and more less, allow a small amount of water burst flow out voluntarily from floral tube;
6) start mudjack curing compound is pressed in dewatering well well casing by described drainage floral tube, curing compound is infiltrated in the fill material in dewatering well;
7) position of drainage floral tube being exposed backplate surface is cut off, and is shut by well casing mouth with cover plate, then uses around high-strength concrete shutoff well casing, so far completes the shutoff of dewatering well.
CN201310286045.5A 2013-07-09 2013-07-09 Foundation pit dewatering well pressure-reduction-type plugging method CN103343543B (en)

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CN201310286045.5A CN103343543B (en) 2013-07-09 2013-07-09 Foundation pit dewatering well pressure-reduction-type plugging method

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CN103334443A (en) * 2013-06-27 2013-10-02 中建七局安装工程有限公司 Mud cement pebble layer composite geological impacting hole forming dewatering well construction method
CN103526766B (en) * 2013-10-12 2015-06-03 中建八局第三建设有限公司 Method for plugging relief well of deep foundation pit
CN103967028A (en) * 2014-05-27 2014-08-06 江苏南通三建集团有限公司 Immersed tube drainage structure and method for handling suddenly-produced foundation pit water bursting and fountains through immersed tube drainage structure
CN104631477B (en) * 2014-12-23 2017-10-31 中建四局第六建筑工程有限公司 A kind of method that dewatering device is installed and blocked in processing foundation ditch
CN104711994A (en) * 2015-01-27 2015-06-17 江苏省华建建设股份有限公司 Foundation pit deep well rainfall and plugging construction method
CN105178342B (en) * 2015-08-10 2017-03-22 中建八局第三建设有限公司 Precipitation well casing and method for blocking reserved hole of foundation pit through precipitation well casing
CN105625482B (en) * 2016-03-21 2017-11-21 上海长凯岩土工程有限公司 Pattern and its application on underground engineering sole plate
CN105735331B (en) * 2016-03-21 2018-02-23 上海长凯岩土工程有限公司 A kind of underground engineering construction method for grouting reinforcement
CN105804124B (en) * 2016-03-21 2018-02-23 上海长凯岩土工程有限公司 Underground engineering gushes hydraulic pressure control method with protrusion-dispelling
CN105780792B (en) * 2016-04-12 2018-11-02 中南勘察设计院集团有限公司 A kind of foundation pit high water head Dewatering by pressure reduction well shut-in well method and structure of shunting in a well
CN106013265B (en) * 2016-07-15 2018-04-27 宁波建工工程集团有限公司 Basement is met an urgent need the construction method of float Structure
CN106677198A (en) * 2017-01-20 2017-05-17 上海长凯岩土工程有限公司 Well plugging method under dynamic water level state
CN109882113B (en) * 2019-03-07 2020-12-01 东北大学 Construction method of dewatering well plugging structure
CN110258660A (en) * 2019-06-18 2019-09-20 广东龙越建筑工程有限公司 The manufacture craft and shut-in well technique of the decompression drainage sump of basement anti-floating
CN110318409A (en) * 2019-06-27 2019-10-11 联建建设工程有限公司 A kind of deep basal pit artesian water is prominent to gush decompressor
CN110331732B (en) * 2019-07-30 2020-11-10 杭州江润科技有限公司 Foundation pit pressure reduction dewatering system and construction method

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