CN103161171A - Method for sealing pressure-reduced dewatering well with water pump - Google Patents

Method for sealing pressure-reduced dewatering well with water pump Download PDF

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Publication number
CN103161171A
CN103161171A CN2011104131380A CN201110413138A CN103161171A CN 103161171 A CN103161171 A CN 103161171A CN 2011104131380 A CN2011104131380 A CN 2011104131380A CN 201110413138 A CN201110413138 A CN 201110413138A CN 103161171 A CN103161171 A CN 103161171A
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plate
water
steel
water pump
well
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CN2011104131380A
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CN103161171B (en
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尹亚鸿
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China MCC20 Group Corp Ltd
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China MCC20 Group Corp Ltd
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Abstract

The invention relates to foundation pit dewatering wells, in particular to a method for sealing a pressure-reduced dewatering well with a water pump. The method for sealing the pressure-reduced dewatering well with the water pump includes the following steps: a step one is that when a reinforced concrete structure of a basement is constructed to reach the situation that self-weight of the reinforced concrete structure can exceed the uplift force of confined water, the water pump stops pumping water from the pressure-reduced dewatering well and is lifted, and a valve is mounted on a water pipe of the water pump and placed at a position which is 30 centimeters higher than a bottom benchmark of a bottom plate; a step two is that a steel support plate is machined, two steel reinforcing cage hanging hooks are welded on the steel support plate, then the water pipe of the water pump, and an electric cable penetrate through the steel support plate, and then the water pump is placed to be at a predetermined depth; a step three is that a steel sleeve is arranged on an upper opening of the pressure-reduced dewatering well, a lower opening of the steel sleeve extends into the bottom of the bottom plate, an upper opening of the steel sleeve is higher than the top of the bottom plate, and a steel plate water stop ring is welded at the middle position, in the thickness direction of the bottom plate, of the steel sleeve; a step four is that the water pump is turned on for pumping the water, and the water level is enabled to be lowered to be 3-4 meters below the bottom of the bottom plate; a step five is that rapid hardening concrete is quickly poured to reach the bottom of the valve, wherein the strength of the rapid hardening concrete is the same as the strength of the bottom plate, and pumping of the water is not stopped at the time; a step six is that after the rapid hardening concrete reaches the strength and can meet floating prevention conditions, the water stop valve is closed, and the water pipe of the water pump, and the steel reinforcing cage hanging hooks are cut; a step seven is that the concrete with the same strength as the bottom plate is poured for the second time to reach a position which is 4-7 centimeters below the top of the bottom plate; a step eight is that at the position which is 4-7 centimeters below the top of the bottom plate, a steel plate is used for being fully welded on the steel sleeve in a sealed mode; and a step nine is that the concrete is poured until the concrete reaches the top face of the bottom plate. The method for sealing the pressure-reduced dewatering well with the water pump is good in well sealing quality, high in speed, and low in cost compared to a pressurized grouting well sealing method.

Description

The band pump shut-in well method of Dewatering by pressure reduction well
Technical field
The present invention relates to the foundation pit dewatering well, relate in particular to the band pump shut-in well method of dewatering well.
Background technology
The coastal area is underground moisture abundant; artesian aquifer is generally arranged; when underground excavation of foundation pit during to certain depth; the Dewatering by pressure reduction well is set comes dewatering confined water to guarantee the safety of foundation ditch; structure of reinforced concrete at basement arrives its gravity energy greater than artesian aquifer hydraulic pressure jacking force, can seal the Dewatering by pressure reduction well.Because the hydraulic pressure in the Dewatering by pressure reduction well is large, the artesian aquifer transmission coefficient is large, supply is fast, water yield is abundant, therefore displacement is larger, its shut-in well difficulty of construction is larger, generally can adopt the High-Pressure Grouting Method shut-in well for this type of artesian well, High-Pressure Grouting Method shut-in well is with rig claw sheet injection cement (water glass) mortar in the Dewatering by pressure reduction well under certain pressure, but the method cost is high, and is long in time limit, and effect is difficult for guaranteeing.
In view of the foregoing, have bibliographical information to adopt the decompression shut-in well, and also report to some extent of band pump shut-in well, but to build be all once to complete to the concrete of which kind of method, may there be bubble in the concrete rapid solidification, impact shut-in well quality.
Summary of the invention
The present invention is intended to solve the problems of the technologies described above, and the band pump shut-in well method of Dewatering by pressure reduction well is provided.The present invention shunts in a well, and quality is good, speed is fast, and cost is low than grouting under pressure shut-in well method.
For addressing the above problem, a kind of band pump shut-in well method of Dewatering by pressure reduction well, it comprises the following steps:
When step 1, the structure of reinforced concrete of basement surpass the artesian water uplift force to its gravity energy, stop the Dewatering by pressure reduction well and draw water, lift pump, mounted valve on the water pump water pipe, valve are placed in the above 30-35cm of absolute altitude place at the bottom of base plate.
Step 2, the machined steel supporting plate, two reinforcing cage hooks of welding, pass the steel supporting plate with water pump water pipe, cable on the steel supporting plate, places water pump to desired depth;
Step 3 at the aboveground mouthful steel bushing of placing of Dewatering by pressure reduction, at the bottom of the steel bushing end opening stretches into base plate, suitable for readingly exceeds base top, and steel bushing is at the place, centre position of base plate thickness direction welding steel plate seal ring;
Step 4, turn on pump draws water, and water level is down to following 3-4 rice at the bottom of base plate;
Step 5, the fast pouring intensity rapid hardening concrete identical with base plate strength are to valve, and draw water and do not stop this moment;
Step 6, the rapid hardening concrete reaches intensity, after satisfying the anti-floating condition, closes the sealing valve, blocks water pump pipeline, reinforcing cage hook;
Step 7, second pouring intensity with the identical concrete of base plate strength to the following 4-7cm of base top place,
Step 8 at the following 4-7cm of base top place, is welded steel bushing with the steel plate full weld;
Step 9 is annotated concrete to plate top surface.
The band pump shut-in well method of described Dewatering by pressure reduction well, described step 3, between described steel bushing and seal ring, weld seam is continuous full weld.
The present invention has reduced construction cost, and the High-Pressure Grouting Method shut-in well needs to dewatering well casing pack microlith " melon seeds " sheet material, and the Dewatering by pressure reduction well depth is generally deep, and microlith " melon seeds " sheet material and grouting amount are large, and cost is high.Band pump shut-in well job practices only needs to process in 4 meters depth boundses in the Dewatering by pressure reduction well, has reduced construction cost.The present invention has improved the reliability of Dewatering by pressure reduction well shut-in well, thereby has guaranteed the safety of foundation ditch, and has reduced risk of leakage.Easy construction of the present invention, the shut-in well operation is simple, convenient and swift.Can complete rapidly the shut-in well construction under feasible ancillary method, guarantee to complete water sealing operation before water level rises to well head.
Description of drawings
Below, by reference to the accompanying drawings, the present invention is further illustrated:
Fig. 1 is schematic diagram of the present invention.
The specific embodiment
As shown in Figure 1, the band pump shut-in well method of Dewatering by pressure reduction well of the present invention, it comprises the following steps:
1, when the structure of reinforced concrete of basement surpasses the artesian water uplift force to its gravity energy, stop Dewatering by pressure reduction well 6 and draw water, lift pump 1, mounted valve 3 on water pump water pipe 2, and valve 3 is placed in base plate, and the 30-35cm place is at 4 the end.
2, the thick steel supporting plate 5 of processing 5mm, two reinforcing cage hooks of welding, pass steel supporting plate 5 with water pump water pipe 2, cable on steel supporting plate 5, places water pump 1 to desired depth.
3, place steel bushing 7 aboveground mouthful of Dewatering by pressure reduction, the steel bushing end opening stretches into base plate 5 end 15cm, suitable for readingly exceed base top 5cm, steel bushing 7 is at the wide steel plate water-stopping ring 8 of the weldering 15cm of place, centre position of base plate thickness direction, and 8 weld seams of steel bushing 7 and seal ring must continuous full weld.
4, turn on pump draws water, and water level is down to following 3-4 rice at the bottom of base plate.
5, fast pouring rapid hardening concrete (the same base plate strength of intensity) is to valve, and draw water and do not stop this moment.
6, the rapid hardening concrete reaches intensity, after satisfying the anti-floating condition, closes the sealing valve, blocks water pump pipeline, reinforcing cage hook.
7, second pouring concrete (the same base plate strength of intensity) is to the following 4-7cm of base top place,
8, at the following 4-7cm of base top place, be welded steel bushing with the steel plate full weld.
9, annotate concrete to plate top surface.

Claims (2)

1. the band pump shut-in well method of a Dewatering by pressure reduction well, is characterized in that, it comprises the following steps:
When step 1, the structure of reinforced concrete of basement surpass the artesian water uplift force to its gravity energy, stop the Dewatering by pressure reduction well and draw water, lift pump, mounted valve on the water pump water pipe, valve are placed in the above 30-35cm of absolute altitude place at the bottom of base plate;
Step 2, the machined steel supporting plate, two reinforcing cage hooks of welding, pass the steel supporting plate with water pump water pipe, cable on the steel supporting plate, places water pump to desired depth;
Step 3 at the aboveground mouthful steel bushing of placing of Dewatering by pressure reduction, at the bottom of the steel bushing end opening stretches into base plate, suitable for readingly exceeds base top, and steel bushing is at the place, centre position of base plate thickness direction welding steel plate seal ring;
Step 4, turn on pump draws water, and water level is down to following 3-4 rice at the bottom of base plate;
Step 5, the fast pouring intensity rapid hardening concrete identical with base plate strength are to valve, and draw water and do not stop this moment;
Step 6, the rapid hardening concrete reaches intensity, after satisfying the anti-floating condition, closes the sealing valve, blocks water pump pipeline, reinforcing cage hook;
Step 7, second pouring intensity with the identical concrete of base plate strength to the following 4-7cm of base top place,
Step 8 at the following 4-7cm of base top place, is welded steel bushing with the steel plate full weld;
Step 9 is annotated concrete to plate top surface.
2. the band pump shut-in well method of Dewatering by pressure reduction well according to claim 1, is characterized in that, described step 3, and between described steel bushing and seal ring, weld seam is continuous full weld.
CN201110413138.0A 2011-12-13 2011-12-13 The band pump shut-in well method of Dewatering by pressure reduction well Active CN103161171B (en)

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CN201110413138.0A CN103161171B (en) 2011-12-13 2011-12-13 The band pump shut-in well method of Dewatering by pressure reduction well

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Application Number Priority Date Filing Date Title
CN201110413138.0A CN103161171B (en) 2011-12-13 2011-12-13 The band pump shut-in well method of Dewatering by pressure reduction well

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CN103161171B CN103161171B (en) 2015-09-30

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105780791A (en) * 2014-08-28 2016-07-20 郭伟新 Well plugging construction method for deep dewatering wellhead inside underground garage foundation pit
CN106351240A (en) * 2015-07-16 2017-01-25 中勘冶金勘察设计研究院有限责任公司 Shut-in method for dewatering well arranged below building or structure foundation
CN108824464A (en) * 2018-07-24 2018-11-16 北京首钢建设集团有限公司 A kind of whirling well deep building pit piping bottom sealing method
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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260334A (en) * 1976-02-11 1981-04-07 Kelley Contract Dewatering Company Ground dewatering system
CN1092500A (en) * 1994-01-27 1994-09-21 陈玉兴 Well closing water and oil suction method and equipment thereof
RU2237800C1 (en) * 2002-07-16 2004-10-10 Общество с ограниченной ответственностью "Украинский межрегиональный центр "Гидротон ЛТД." Method for extracting liquid oil products from surface of subterranean waters and system for realization of said method
CN201172828Y (en) * 2008-03-19 2008-12-31 山西第六建筑有限公司 Well-covering device for dewatering well
CN201567582U (en) * 2009-12-29 2010-09-01 中建城市建设发展有限公司 Rainwater saving device of foundation pit
CN101936010A (en) * 2010-08-19 2011-01-05 天津二十冶建设有限公司 Construction method of dewatering well in underground concrete structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260334A (en) * 1976-02-11 1981-04-07 Kelley Contract Dewatering Company Ground dewatering system
CN1092500A (en) * 1994-01-27 1994-09-21 陈玉兴 Well closing water and oil suction method and equipment thereof
RU2237800C1 (en) * 2002-07-16 2004-10-10 Общество с ограниченной ответственностью "Украинский межрегиональный центр "Гидротон ЛТД." Method for extracting liquid oil products from surface of subterranean waters and system for realization of said method
CN201172828Y (en) * 2008-03-19 2008-12-31 山西第六建筑有限公司 Well-covering device for dewatering well
CN201567582U (en) * 2009-12-29 2010-09-01 中建城市建设发展有限公司 Rainwater saving device of foundation pit
CN101936010A (en) * 2010-08-19 2011-01-05 天津二十冶建设有限公司 Construction method of dewatering well in underground concrete structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105780791A (en) * 2014-08-28 2016-07-20 郭伟新 Well plugging construction method for deep dewatering wellhead inside underground garage foundation pit
CN106351240A (en) * 2015-07-16 2017-01-25 中勘冶金勘察设计研究院有限责任公司 Shut-in method for dewatering well arranged below building or structure foundation
CN108824464A (en) * 2018-07-24 2018-11-16 北京首钢建设集团有限公司 A kind of whirling well deep building pit piping bottom sealing method
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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