CN103334444B - A kind of method for blocking of foundation pit dewatering well pressure release type - Google Patents

A kind of method for blocking of foundation pit dewatering well pressure release type Download PDF

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Publication number
CN103334444B
CN103334444B CN201310285760.7A CN201310285760A CN103334444B CN 103334444 B CN103334444 B CN 103334444B CN 201310285760 A CN201310285760 A CN 201310285760A CN 103334444 B CN103334444 B CN 103334444B
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well
floral tube
well casing
dewatering
dewatering well
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CN103334444A (en
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黎明中
李庆辉
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China First Metallurgical Group Co Ltd
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China First Metallurgical Group Co Ltd
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Abstract

The invention provides a kind of method for blocking of foundation pit dewatering well pressure release type, it comprises the following steps: water string on dewatering well well casing overlaps outward to carry out reinforcing pre-buried; Imbed water string, build in sole plate concrete; 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 top of described drainage floral tube communicates with an aqueduct; Shunt in a well, propose suction pump, and then shut-in well material is inserted successively in dewatering well well casing; Cover plate and water string are connected and fixed, allow a small amount of water burst flow out voluntarily from floral tube; Start mudjack curing compound to be pressed in dewatering well well casing; The position that drainage floral tube exposes backplate surface is cut off, then uses around high-strength concrete shutoff well casing, so far complete the shutoff of dewatering well.Widely, and efficiency of construction is high for range of application of the present invention, and easy to operate, water sealing effect is good, and consequent effects is little.

Description

A kind of method for blocking of foundation pit dewatering well pressure release type
Technical field
The present invention relates to the foundation pit construction in structure foundation Foundation Design, particularly relate to a kind of method for blocking of foundation pit dewatering well pressure release type.
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 method for blocking completing the foundation pit dewatering well pressure release type of 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 method for blocking for foundation pit dewatering well pressure release type, it is characterized in that, it comprises the following steps:
1) concrete dewatering well well casing is torn open 250-350mm to bottom cushion before construction of bottom plates, water string on dewatering well well casing overlaps to carry out reinforcing pre-buried outward;
2) foundation ditch cushion construction is complete imbeds water string afterwards, and fixes with base plate, builds in sole plate concrete, arranges at least one seal ring at water string outer wall;
3) after basement bottom board concrete reaches intensity, cut off unnecessary well casing on backplate surface, and insert bottom a drainage floral tube to well casing, the bottom sidewall of described drainage floral tube offers multiple through hole, the top of described drainage floral tube communicates with an aqueduct, and the top of described drainage floral tube is provided with stop valve;
4) shunt in a well when concrete strength reaches more than 70% and the construction of foundation ditch internal construction meets and stops precipitation condition, suction pump in dewatering well well casing is proposed, and then shut-in well material is inserted successively in dewatering well well casing, then fill up bottom base plate successively to well casing mouth of pipe position dry cement and pea gravel concreten;
5) cover plate and water string top are connected and fixed, a small amount of water burst is allowed to flow out (water of outflow gets rid of ground by suction pump) voluntarily from floral tube, start mudjack by curing compound by described drainage floral tube press-in dewatering well well casing, curing compound is infiltrated in the fill material in dewatering well, makes this place's well head without till infiltration;
6) position of drainage floral tube being exposed backplate surface is cut off, then uses around high-strength concrete shutoff well casing, so far completes the shutoff of dewatering well.
In such scheme, the cover plate in described step 6) is flange plate, and described water string is that steel are made, and the top of described water string is provided with flange, and the top flange of described water string and flange plate pass through Flange joint.
In such scheme, between the top flange dish of described water string and flange plate, be provided with sealing ring.
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.
Principle of the present invention is: we know when at the bottom of groundwater table is higher than the Foundation Pit that will excavate during design elevation, and when having piping etc. dangerous, often takes the methods such as deep-well precipitation to ensure the safety of foundation pit construction and normally carrying out of engineering.When pit earthwork excavation completes, when next step carries out concrete floor and Underground Construction, to consider that the later stage of deep well uses and shutoff problem, because groundwater table is higher than when cheating end absolute altitude, just head difference is created in the well casing used, when proposing suction pump when shunting in a well, water will rise outflow, now can block in the little situation of hydraulic pressure to backfill material in well on request rapidly, when current are large, when pressure is high, backfill material dilution is fallen by water, the method is often incessantly stifled, therefore, the present invention is by the effect of the drainage floral tube in well casing and water string device, after having been filled by material in well casing on request under pressure release state, mud jacking is closely knit again, reach the effect of shutoff.
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 pressure release 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 shutoff process schematic of the foundation pit dewatering well pressure release 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 concrete pipe.
As shown in Figure 1 to Figure 3, its a kind of foundation pit dewatering well pressure release 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 mudjack 12 be connected with aqueduct 2.Described plugging device also comprises water string 20(as shown in Figure 4).Water string 20 is sheathed on the top of concrete well.The outer wall of water string 20 is provided with two seal rings 21, and the top of water string 20 is connected with flange, and this flange is connected with flange plate 3.Sealing ring 22 is provided with between the flange on water string 20 top and cover plate 3.The diameter of water string 20 is determined according to the diameter of dewatering well, generally about 200mm larger than dewatering well well casing diameter.
As Fig. 4 shows, the embodiment of the present invention provides a kind of method for blocking of foundation pit dewatering well pressure release type, and it comprises the following steps:
1) base plate 7 tears 250-350mm to bottom cushion open dewatering well well casing 6 before constructing, water string 20 on the outer cover of dewatering well well casing 6 to carry out reinforcing pre-buried;
2) foundation ditch cushion construction is complete imbeds water string 20 afterwards, and with baseplate reinforcing bar by being welded and fixed, build in sole plate concrete, the suction pump (not shown) in dewatering well is recovered to proceed precipitation, arranges two seal rings 21 at water string 20 outer wall;
3) after basement bottom board concrete reaches intensity, cut off base plate 7 unnecessary well casing on the surface, and insert drainage floral tube 1 to a well casing bottom, the bottom sidewall of described drainage floral tube 1 offers multiple through hole 5, the top of described drainage floral tube 1 communicates with an aqueduct 2, and the top of described 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 stopping precipitation condition, start shut-in well, suction pump in dewatering well well casing 6 is proposed, and then shut-in well material is inserted successively in dewatering well well casing 6, 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) flange plate 3 is added seal washer 22 with the flange of water string 20 is middle, again two flanges are passed through bolt tightening, allow a small amount of water burst flow out (water of outflow gets rid of ground by suction pump) voluntarily from drainage floral tube 1, close the stop valve 4 of plugging device, access mudjack 12.Open stop valve 4, 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;
6) position 18 of drainage floral tube 1 being exposed backplate surface is cut off, and adopts high-strength concrete material 19 pairs of well heads to carry out covering subsequently and closes, so far complete the shutoff of dewatering well.
Be understandable that, when current are larger time, drainage pump can be increased after the proposition suction pump in step 4) and to be connected with aqueduct the step of carrying out drawing water, and then shut-in well material is shunt in a 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 (3)

1. a method for blocking for foundation pit dewatering well pressure release type, is characterized in that, it comprises the following steps:
1) concrete dewatering well well casing is torn open 250-350mm to bottom cushion before construction of bottom plates, water string on dewatering well well casing overlaps to carry out reinforcing pre-buried outward;
2) foundation ditch cushion construction is complete imbeds water string afterwards, and fixes with base plate, builds in sole plate concrete, arranges at least one seal ring at water string outer wall;
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 an aqueduct, and the top of described drainage floral tube is provided with stop valve;
4) shunt in a well when concrete strength reaches more than 70% and the construction of foundation ditch internal construction meets and stops precipitation condition, suction pump in dewatering well well casing is proposed, in time shut-in well material is inserted in dewatering well well casing successively, 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) cover plate and water string top are connected and fixed, allow a small amount of water burst flow out voluntarily from floral tube, start mudjack and 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;
6) position of drainage floral tube being exposed backplate surface is cut off, then uses around high-strength concrete shutoff well casing, so far completes the shutoff of dewatering well.
2. method for blocking as claimed in claim 1, it is characterized in that, the cover plate in described step 6) is flange plate, and described water string is that steel are made, the top of described water string is provided with flange, and the top flange of described water string and flange plate pass through Flange joint.
3. method for blocking as claimed in claim 2, is characterized in that, be provided with sealing ring between the top flange dish of described water string and flange plate.
CN201310285760.7A 2013-07-09 2013-07-09 A kind of method for blocking of foundation pit dewatering well pressure release type Active CN103334444B (en)

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CN103498486B (en) * 2013-10-17 2015-12-09 中建七局(上海)有限公司 A kind of sleeve pipe that adopts implements the method for shutoff to ater-casting precipitation pipe well
CN106284310B (en) * 2015-05-21 2018-06-15 中天建设集团有限公司 Stake holes, which is drawn water, in the case of a kind of big flow water drains envelope pile construction method
CN105544572B (en) * 2015-12-09 2017-06-30 浙江科技学院 A kind of foundation ditch artesian aquifer plugging dewatering well method
CN105544571B (en) * 2015-12-09 2018-03-09 浙江科技学院 Foundation ditch artesian aquifer plugging dewatering well device
CN106894428A (en) * 2015-12-21 2017-06-27 中冶天工集团有限公司 A kind of multi layer waterproof method for blocking of mass raft foundation dewatering well
CN107503363B (en) * 2016-06-14 2019-04-26 上海宝冶集团有限公司 Coastal waters weak soil property relief well of deep foundation pit processing method
CN106400823A (en) * 2016-09-23 2017-02-15 中建八局第四建设有限公司 Reserved well plugging method
CN106522252A (en) * 2016-12-07 2017-03-22 山西省第三建筑工程公司 Seepage-proofing blocking mechanism and method for deep foundation pit raft dewatering well
CN109680698A (en) * 2017-10-18 2019-04-26 五冶集团上海有限公司 It is a kind of to block precipitation tube well construction method with pipe cap
CN107956221B (en) * 2017-12-12 2020-10-23 中国一冶集团有限公司 Precipitation well pipeline protection device and construction method
CN108612133B (en) * 2018-04-25 2020-03-17 中国二十冶集团有限公司 Exploratory hole inrush blocking construction method
CN108755723A (en) * 2018-06-05 2018-11-06 中冶天工集团有限公司 A kind of removable dewatering well well mouth sealing device and slip casting plugging construction method
CN109882113B (en) * 2019-03-07 2020-12-01 东北大学 Construction method of dewatering well plugging structure
CN111424694A (en) * 2020-04-17 2020-07-17 广东省水利水电第三工程局有限公司 Well sealing device and well sealing method for foundation structure water collecting well

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