CN103255768A - Grouting construction method of engineering well after bottom wall in pipe is sealed - Google Patents
Grouting construction method of engineering well after bottom wall in pipe is sealed Download PDFInfo
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- CN103255768A CN103255768A CN2013101781808A CN201310178180A CN103255768A CN 103255768 A CN103255768 A CN 103255768A CN 2013101781808 A CN2013101781808 A CN 2013101781808A CN 201310178180 A CN201310178180 A CN 201310178180A CN 103255768 A CN103255768 A CN 103255768A
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Abstract
The invention discloses a grouting construction method of an engineering well after the bottom wall in a pipe is sealed. The method includes the steps of firstly installing a floating plate on the bottom of a bottom joint well pipe of the engineering well in a welding mode, carrying out welding and reinforcement through a cross-shaped steel plate, and welding and reinforcing a connection portion of the bottom of the bottom joint well pipe and the inner wall of the well pipe, secondly arranging at least two sets of grouting pipes in a symmetrical mode along the outer side of the well pipe, inserting one set of grouting pipes into the bottom of the well pipe, arranging other sets of grouting pipes on positions with the distance of 1m from the bottom of the well pipe, welding the grouting pipes through pipe hoops, and welding the grouting pipes with the well pipe firmly, thirdly, welding a steel plate protection device on a pipe opening of the grouting pipe at the bottom joint, preforming a grouting hole in the side face of the protection device, and connecting the grouting pipes and a grouting pump on a well opening through a high-pressure rubber pipe, fourthly, determining grouting filling sections and grouting filling times, fifthly, installing and connecting the grouting pump, carrying out grouting filling operation till design demands are met, and completing grouting and cementing. A grouting system is simple in structure, convenient to operate, improves construction efficiency and reduces construction risks.
Description
Technical field
The present invention relates to back cover grouting behind shaft or drift lining job practices in a kind of engineering well support with backfilling grouting construction method, particularly a kind of engineering well casing, belong to mine and municipal engineering construction technical field.
Background technology
In the engineering construction construction, the mechanical boring method drilling construction of the many employings of diameter 0.8～1.5m engineering well, after well casing is laid and is put in place, traditional cement slurry cementing method mainly contains two kinds: a kind of is in the well casing bottom kickboard to be installed to make well casing become a semi-enclosed floating body, one way valve is installed at the kickboard top, and is connected with Grouting Pipe, adopts the floating and dropping method of cylindrical shaft wall method, utilize in the well and carry out slip casting behind the buoyancy of liquid effect sinking well casing, realize well cementation.The shortcoming of this method is that the impurity in the slurries stops up one way valve easily, causes grouting pipeline obstructed, or because Grouting Pipe connects the insecure cement paste that causes to be leaked in the well casing, causes the slip casting accident.Another kind method is that mouth does not seal at the bottom of the well casing, adopts nature sinking method to lay well casing, and well casing is laid Grouting Pipe after sinking to finishing in well casing, and the sealing well casing is suitable for reading to carry out slip casting.The shortcoming of this method is when the well casing deadweight is big, can't implement owing to the lifting appliance capabilities limits causes the nature sinking scheme.
Summary of the invention
The purpose of this invention is to provide back cover grouting behind shaft or drift lining job practices in a kind of engineering well casing, be used for the interior back cover grouting behind shaft or drift lining construction of pipe of diameter 0.8～1.5m engineering well, realized well casing mortar depositing construction safety.
The object of the present invention is achieved like this: back cover grouting behind shaft or drift lining job practices in a kind of engineering well casing may further comprise the steps:
(1) thickness being installed in the bottom of coxopodite well casing is 25～30mm steel kickboard, and uses the cross steel plate reinforcement of weld, and kickboard and well casing inwall are fastenedly connected, and makes well casing and kickboard form a semi-enclosed integral body;
(2) be no less than 2 cover Grouting Pipe along well casing outer wall symmetric arrangement, wherein a cover stretches into the well casing bottom, all the other place high 1m place at the bottom of the well casing, the Grouting Pipe internal diameter is 40～60mm, wall thickness 3～5mm, the single-unit Grouting Pipe is welded to connect by pipe collar, Grouting Pipe and well casing firmly weld, sink to laying simultaneously with well casing, for preventing that the mud skin stops up Grouting Pipe in the well casing sinking installation course, protector in the making of coxopodite Grouting Pipe mouth of pipe welding 10mm steel plate, guard sideways is reserved grout outlet, and Grouting Pipe is connected by high-pressure rubber pipe with grouting pump at well head, in conjunction with well casing suspender crane capacity, adjust the ballast water height in the well casing, utilize the floating and dropping method of cylindrical shaft wall method to lay well casing to projected depth;
(3) calculate definite grouting filling section and grouting filling number of times, avoid the excessive well casing come-up that causes of grouting filling height, the first section high grouting filling in well casing bottom carries out in whole well casings sank to finishing back 3 days;
(4) adopt vehicle-mounted can cement, directly be connected with automatic mixing drum, the mixer configuration is no less than 2, the configuration requirement of mixer is that its stirring capacity is finished primary filling in 6 ~ 8 hours, adopts and stirs slurry systems produce cement paste automatically, air-supply earlier before the water supply mud, after send cement, the mud of cutting off the water earlier when stopping, it is out-of-blast again to treat in the pipeline that cement all enters when stirring slurry jar, and the setting of agitator tank cement pipeline entrance prevents the device that stops up;
(5) installation and connection grouting pump, the grouting filling operation, the pressure limit of grouting pump is 0.1～1.0MPa, be provided with valve between each grouting pump and the grouting pipeline, to prevent that grouting pipeline from stopping up, slip casting is carried out continuously, and the time of at every turn resting is no more than 0.5 hour, meet design requirement until slip casting, finish the slip casting well cementing operation.
The present invention is specially adapted to diameter 0.8～1.5m engineering well support with backfilling mortar depositing construction.
The beneficial effect that the present invention obtains is:
The steel kickboard is installed at the bottom of the well casing, has reduced the risk of well casing bottom slurries seepage, improved the slip casting safety.Grouting pipeline is external, and protector is set, and lays simultaneously with well casing, has improved the quality of connection of grouting pipeline and the reliability of laying, and has reduced construction risk.
Description of drawings
Fig. 1 is filling schematic diagram of the present invention.
The implication of number in the figure representative is: 1, borehole wall 2, valve 3, well casing 4, annular gap 5, kickboard 6, Grouting Pipe 7, protected apron 8, pipe collar 9, one way valve 10, high-pressure rubber pipe 11, grouting pump.
The specific embodiment
Following examples are used for explanation the present invention.
Embodiment
Certain ground boring gas pipeline engineering, bore diameter 1200mm, hole depth 412.5m, well casing are the seamless steel pipe of external diameter 820mm, adopt floating method to lay, and the outer Grouting Pipe of twice is installed when well casing is laid.This engineering adopts back cover support with backfilling cement slurry cementing in the pipe, and theory is filled amount of fill 248m
3, actual support with backfilling amounts to 269m
3Utilize grouting construction method of the present invention, concrete steps are as follows:
1, steel kickboard 5 is installed in the bottom of coxopodite well casing 3, thickness 30mm is processed into the plectane of diameter 830mm, is welded to connect with well casing 3.Kickboard 5 adopts thick 30mm, high 200mm steel plate to carry out " ten " reinforcement of weld, and arrange at the bottom of four 200mm() * the 200mm(height) the triangle gusset welds well casing 3 inwalls and kickboard 5.Weld seam should be full, and the weldering of leakage, slag inclusion, seminess must not be arranged.
2, Grouting Pipe 6 is external diameter 60mm, wall thickness 3mm hot rolled seamless steel tube, and the long 6m of single-unit, by internal diameter 62mm, the pipe collar 8 of thick 5mm is welded to connect.Stretch into well casing 1 bottom along well casing 3 outer wall symmetric arrangement two cover Grouting Pipe 2, one covers, one is placed on above 1m place, 1 end of well casing, and one way valve 9 is installed in Grouting Pipe 6 bottoms, and Grouting Pipe 6 and well casing 3 firm welding are laid simultaneously.
3, pipe collar 8 places add the high 70mm of weldering, thick 10mm steel protected apron 7 protection Grouting Pipe 6, can prevent that the mud skin from stopping up Grouting Pipe.
4, adopt the once grouting well cementation, for preventing the well casing come-up, apply the counterweight that is not less than 40t in the well casing.
5, the used cement of slip casting, materials such as flyash adopt vehicle-mounted can cement, and cement grout is mechanical agitation in the automatic mixing drum of special use, and this engineering is calculated total grouting amount according to 1.2 fullness coefficient and is about 303 m
3, each every can be stirred 6m
3, mixing time is 10 minutes, can finish cement paste and stir in 5 hours, satisfies construction requirement.
6, the pressure limit of grouting pump 11 is 0.1～1.0MPa during slip casting, and mortar depositing construction carries out continuously, between each grouting pump and the grouting pipeline valve is set, and the time of at every turn resting must not surpass 0.5 hour, prevent that grouting pipeline from stopping up.
7, connect Grouting Pipe 6 and grouting pump 11 with high-pressure rubber pipe 10, valve 2 is set, finish back cover grouting behind shaft or drift lining device in the pipe.
8, mix up cement grout, open valve 2, open grouting pump 11, carry out the slip casting operation according to design parameters, until reaching designing requirement, finish the slip casting work in well casing outer ring-like gap 4.
Claims (1)
1. back cover grouting behind shaft or drift lining job practices in the engineering well casing is characterized in that may further comprise the steps:
(1) thickness being installed in the bottom of coxopodite well casing is 25～30mm steel kickboard, and uses the cross steel plate reinforcement of weld, and kickboard and well casing inwall are fastenedly connected, and makes well casing and kickboard form a semi-enclosed integral body;
(2) be no less than 2 cover Grouting Pipe along well casing outer wall symmetric arrangement, wherein a cover stretches into the well casing bottom, all the other place high 1m place at the bottom of the well casing, the Grouting Pipe internal diameter is 40～60mm, wall thickness 3～5mm, the single-unit Grouting Pipe is welded to connect by pipe collar, Grouting Pipe and well casing firmly weld, sink to laying simultaneously with well casing, at the protector that coxopodite Grouting Pipe mouth of pipe welding 10mm steel plate is made, guard sideways is reserved grout outlet, Grouting Pipe is connected by high-pressure rubber pipe with grouting pump at well head, in conjunction with well casing suspender crane capacity, adjust the ballast water height in the well casing, utilize the floating and dropping method of cylindrical shaft wall method to lay well casing to projected depth;
(3) calculate definite grouting filling section and grouting filling number of times, avoid the excessive well casing come-up that causes of grouting filling height, the first section high grouting filling in well casing bottom carries out in whole well casings sank to finishing back 3 days;
(4) adopt vehicle-mounted can cement, directly be connected with automatic mixing drum, the mixer configuration is no less than 2, the configuration requirement of mixer is that its stirring capacity is finished primary filling in 6 ~ 8 hours, adopts and stirs slurry systems produce cement paste automatically, air-supply earlier before the water supply mud, after send cement, the mud of cutting off the water earlier when stopping, it is out-of-blast again to treat in the pipeline that cement all enters when stirring slurry jar, and the setting of agitator tank cement pipeline entrance prevents the device that stops up;
(5) installation and connection grouting pump, the pressure limit of grouting pump is 0.1～1.0MPa, is provided with valve between each grouting pump and the grouting pipeline, slip casting is carried out continuously, the time of at every turn resting is no more than 0.5 hour, meets design requirement until slip casting, finishes the slip casting well cementing operation.
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| CN2013101781808A CN103255768A (en) | 2013-05-15 | 2013-05-15 | Grouting construction method of engineering well after bottom wall in pipe is sealed |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103883348A (en) * | 2014-04-02 | 2014-06-25 | 淮北矿业（集团）勘探工程有限责任公司 | Method for welding well ground pipeline for gas extraction in mining area |
| CN105756066A (en) * | 2016-04-22 | 2016-07-13 | 江苏巨鑫石油钢管有限公司 | Grouting system used for wharf and bridge piling steel pipe and processing technology thereof |
| CN107780879A (en) * | 2017-09-15 | 2018-03-09 | 核工业北京化工冶金研究院 | A kind of reverse inlet well well formation device and method |
| CN109629573A (en) * | 2019-01-15 | 2019-04-16 | 中交哈尔滨地铁投资建设有限公司 | A kind of pouch slip casting borehole wall water sealing structure |
| CN109723070A (en) * | 2018-12-28 | 2019-05-07 | 上海二十冶建设有限公司 | Concrete well mounting device and application method for underground tube well dewatering |
| CN111322075A (en) * | 2019-10-28 | 2020-06-23 | 中国铁建重工集团股份有限公司 | Backfill slip casting system behind wall for shaft boring machine |
| CN113789803A (en) * | 2021-10-28 | 2021-12-14 | 北京中地恒基建筑工程有限公司 | Construction method of slender open caisson and slender open caisson structure |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103883348A (en) * | 2014-04-02 | 2014-06-25 | 淮北矿业（集团）勘探工程有限责任公司 | Method for welding well ground pipeline for gas extraction in mining area |
| CN103883348B (en) * | 2014-04-02 | 2016-04-20 | 淮北矿业（集团）勘探工程有限责任公司 | The welding method of a kind of minery gas pumping well ground pipeline |
| CN105756066A (en) * | 2016-04-22 | 2016-07-13 | 江苏巨鑫石油钢管有限公司 | Grouting system used for wharf and bridge piling steel pipe and processing technology thereof |
| CN107780879A (en) * | 2017-09-15 | 2018-03-09 | 核工业北京化工冶金研究院 | A kind of reverse inlet well well formation device and method |
| CN109723070A (en) * | 2018-12-28 | 2019-05-07 | 上海二十冶建设有限公司 | Concrete well mounting device and application method for underground tube well dewatering |
| CN109723070B (en) * | 2018-12-28 | 2021-03-26 | 上海二十冶建设有限公司 | Concrete well pipe installation device for underground pipe well precipitation and use method |
| CN109629573A (en) * | 2019-01-15 | 2019-04-16 | 中交哈尔滨地铁投资建设有限公司 | A kind of pouch slip casting borehole wall water sealing structure |
| CN111322075A (en) * | 2019-10-28 | 2020-06-23 | 中国铁建重工集团股份有限公司 | Backfill slip casting system behind wall for shaft boring machine |
| CN111322075B (en) * | 2019-10-28 | 2021-11-23 | 中国铁建重工集团股份有限公司 | Backfill slip casting system behind wall for shaft boring machine |
| CN113789803A (en) * | 2021-10-28 | 2021-12-14 | 北京中地恒基建筑工程有限公司 | Construction method of slender open caisson and slender open caisson structure |
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Application publication date: 20130821 |