CN104762981A - Hole forming method of precipitation well - Google Patents
Hole forming method of precipitation well Download PDFInfo
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- CN104762981A CN104762981A CN201510085120.0A CN201510085120A CN104762981A CN 104762981 A CN104762981 A CN 104762981A CN 201510085120 A CN201510085120 A CN 201510085120A CN 104762981 A CN104762981 A CN 104762981A
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Abstract
The invention refers to the technical field of a building project and provides a hole forming method of a precipitation well. The hole forming method comprises the following steps: drilling a depressurizing well around the precipitation well; and then pumping and drawing water; reducing the water level, reducing the water pressure to the hole wall of the precipitation well requiring hole drilling; and then performing the precipitation well drilling until completion of drilling of the precipitation well; stopping water pumping of the depressurizing well. The hole forming method of the precipitation well can generate a water level difference between the precipitation well required to drill holes and a temporary precipitation well; pressure of water to the hole wall in the precipitation well requiring hole drilling is reduced; and thereby the problem that the existing hole forming method is easy to cause slump in the course of hole drilling is solved.
Description
Technical field
The present invention relates to construction engineering technical field, particularly relate to a kind of hole forming method of dewatering well, relate more specifically to a kind of hole forming method of overseas super thick backfill medium coarse sand dewatering well.
Background technology
Arrange dewatering well in Cast-in-situ Piles in Sand-filling in the tunnel engineering man-made island of Zhuhai and Macao bridge island, port and carry out pump drainage precipitation to water level in the body of island, Cast-in-situ Piles in Sand-filling thickness is more than 18m, and burying casing length during boring underground is 9m, and length is the half of Cast-in-situ Piles in Sand-filling thickness.
Due to the particularity of port Zhuhai and Macao bridge man-made island soil property, top is all backfill medium coarse sand, and when carrying out dewatering well injection in cylinder district, Cast-in-situ Piles in Sand-filling layer thickness is 18.5m, in layer of sand, water content is enriched, sandy soil density is poor, and therefore, existing hole forming method is in boring procedure, because the pressure of water to boring inner hole wall is excessive, very easily easily there is collapse hole phenomenon, adopt general mud off cannot ensure retaining wall effect, also easily cause collapse hole phenomenon.
Therefore, for above deficiency, need to provide a kind of hole forming method being applicable to overseas super thick backfill medium coarse sand dewatering well in the tunnel engineering man-made island of Zhuhai and Macao bridge island, port.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is to provide a kind of hole forming method of dewatering well, water-head is produced in the dewatering well that needs can be made to hole and interim dewatering well, reduce water to the pressure needing the dewatering well inner hole wall of holing, thus solve the problem that collapse hole easily occurs existing hole forming method in boring procedure.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of hole forming method of dewatering well, comprising the steps:
S1, around the dewatering well of preexisting hole, choose relief well position in certain limit, first use vibrating hammer the first casing is shaken heavy after, then carry out relief well boring;
S2, after relief well is accomplished fluently, in relief well, put into the first strainer, and draw water with water pump, before dewatering well injection completes, ensure that in relief well, water level is at certain height;
S3, measure dewatering well with GPS well location after, use vibrating hammer to be shaken at well location by the second casing heavy, shake after heavy end, carry out dewatering well boring;
S4, sinking well casing, and evenly backfill gravel material in well casing surrounding, after gravel material is filled, use vibrating hammer clamp the second casing and extract, exist side by side to be engraved in dewatering well and descend pump to carry out well-flushing;
S5, the tube wall of well casing to be welded, extended to the length of needs.
Preferably, in abovementioned steps S1, around the dewatering well of preexisting hole 11m-15m scope in choose relief well position.
Preferably, in abovementioned steps S1 and S3, use the vibrating hammer heavy concrete grammar that shaken by casing to be: with the hydraulic chuck clamping casing of vibrating hammer, guarantee that the center of suspension hook, vibrating hammer and casing is on a vertical straight line, shakes heavy while the verticality ensureing casing downwards.
Preferably, in abovementioned steps S3, the second casing comprises concentric cylinder and secondary lattice, is provided with casing in cylinder in cylinder, is provided with casing in secondary lattice in secondary lattice, and in cylinder, the length of casing is greater than casing in secondary lattice.
Preferably, in abovementioned steps S3, the concrete grammar of boring comprises the steps:
Topped up with water in S31, mud pit;
S32, when relief well middle water level is reduced to specified altitude assignment, adjustment borer drill rod center and the second casing center superposition, and ensure that drilling rod is vertical;
S33, in the second casing, add clear water with mud pit, start rig, the hole depth of dewatering well is increased by the drilling rod of adjunction rig, on joint, lubrication oil is coated with before drilling rod adjunction, when the rod boring of spreading, use air pressure pump by the evacuating air of drilling rod after spreading, to ensure that slush pump can extract boring mud out;
S34, when at the bottom of the drill bit of rig is lower than the second casing during absolute altitude, in boring, add swell soil, keep highly constant brill to move drill bit modulation mud, after mud modulation evenly, drill bit slowly creeps into again;
The water level in guarantee second casing is needed to flush with the second casing top mouth in the whole process that S35, drill bit creep into;
S36, when after bit drills to design elevation, improve drilling rod section by section.
Preferably, in abovementioned steps S4, the concrete grammar of sinking well casing, comprises the steps:
S41, on the second strainer, add the first cuff, use loop wheel machine to sling the second strainer, and sunk in the boring of dewatering well, the second filter bits is in the center that dewatering well is holed and vertically downward, be finally positioned on the diaphragm of the second casing top mouth;
S42, then the tube wall of well casing is added the second cuff, use loop wheel machine to be winched to by well casing on the second strainer, the tube wall of well casing and the second strainer are spliced after getting well and freeze;
S43, finally by vertical for well casing sinking to boring in design at the bottom of elevation location.
(3) beneficial effect
Technique scheme tool of the present invention has the following advantages:
The invention provides a kind of hole forming method of dewatering well, first injection relief well around dewatering well, then descends pump to draw water, reduce water level, reduce water to the pressure of the dewatering well hole wall that need hole, then carry out dewatering well boring, until dewatering well injection completes, relief well just can stop pumping.
The hole forming method of dewatering well provided by the invention, the hydraulic pressure utilizing water-head to produce ensures that collapse hole phenomenon does not occur hole wall, substantially increases operating efficiency, if prevent from collapse hole occurs, also need again to hole, and cannot ensure again to hole can successful problem.
Dewatering well hole forming method provided by the invention; in dewatering well drilling construction process; second casing adopts the form of half casing to protect boring, calculates learn, according to full casing through early stage; both waste can be produced to steel; by can be excessive because of the side form resistance of soil to the second casing, be difficult to utilize vibrating hammer to extract, and adopt half casing can save the steel of half; therefore, the form of employing half casing is needed to avoid the problems referred to above occur.
Accompanying drawing explanation
Fig. 1 is the hole forming method principle schematic of dewatering well of the present invention.
In figure: 1: dewatering well; 2: relief well; 3: gravel material; 4: mud; 5: silt clay; 6: silty clay; 7: fine sand; 8: silty clay burning into sand.
Detailed description of the invention
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
Embodiment one
The hole forming method of a kind of dewatering well that the embodiment of the present invention provides, man-made island soil property is followed successively by mud 4, silt clay 5, silty clay 6, fine sand 7, silty clay burning into sand 8 from top to bottom, and the pore-forming principle of dewatering well as shown in Figure 1, comprises the steps:
S1, around the dewatering well 1 of preexisting hole, choose relief well 2 position within the scope of 11m-15m, first use vibrating hammer the first casing is shaken heavy after, then carry out relief well 2 and hole, wherein the length of the first casing is 6m; Use the vibrating hammer heavy concrete grammar that shaken by the first casing to be: to clamp the first casing with the hydraulic chuck of vibrating hammer, guarantee that the center of suspension hook, vibrating hammer and the first casing is on a vertical straight line, shakes heavy while the verticality of guarantee first casing downwards.
S2, after relief well 2 is accomplished fluently, in relief well 2, put into the first strainer, the length of the first strainer is 6m, and draws water with water pump, before dewatering well 1 injection completes, ensures that in relief well 2, water level is at certain height;
S3, measure dewatering well 1 with GPS well location after, use vibrating hammer to be shaken at well location by the second casing heavy, shake after heavy end, carry out dewatering well 1 and hole; Second casing comprises concentric cylinder and secondary lattice, is provided with casing in cylinder in cylinder, is provided with casing in secondary lattice in secondary lattice, and in cylinder, the length of casing is greater than casing in secondary lattice, the long 12m of casing in cylinder, the long 9m of casing in secondary lattice.Use the vibrating hammer heavy concrete grammar that shaken by the second casing to be: to clamp the second casing with the hydraulic chuck of vibrating hammer, guarantee that the center of suspension hook, vibrating hammer and the second casing is on a vertical straight line, shakes heavy while the verticality of guarantee second casing downwards.
S4, sinking well casing, and evenly backfill gravel material 3 in well casing surrounding, after gravel material 3 is filled, use vibrating hammer clamp the second casing and extract, exist side by side to be engraved in dewatering well 1 and descend pump to carry out well-flushing;
S5, the tube wall of well casing to be welded, extended to the length of needs, in the present embodiment, tube wall is extended 4m.
Wherein, in above-mentioned steps S3, the concrete grammar of boring comprises the steps:
Topped up with water in S31, mud pit;
S32, when relief well 2 middle water level is reduced to below ground 6m, adjustment borer drill rod center and the second casing center superposition, and ensure that drilling rod is vertical;
S33, in the second casing, add clear water with mud pit, start rig, the hole depth of dewatering well 1 is increased by the drilling rod of adjunction rig, on joint, lubrication oil is coated with before drilling rod adjunction, when the rod boring of spreading, use air pressure pump by the evacuating air of drilling rod after spreading, to ensure that slush pump can extract boring mud out;
S34, when at the bottom of the drill bit of rig is lower than the second casing during absolute altitude, in boring, add swell soil, keep highly constant brill to move drill bit modulation mud, after mud modulation evenly, drill bit slowly creeps into again;
The water level in guarantee second casing is needed to flush with the second casing top mouth in the whole process that S35, drill bit creep into;
S36, when after bit drills to design elevation, improve drilling rod section by section.
In above-mentioned steps S4, the concrete grammar of sinking well casing, comprises the steps:
S41, on the second strainer, add the first cuff, the long 12m of second strainer, uses loop wheel machine to sling the second strainer, and is sunk in the boring of dewatering well 1, second filter bits is in the center that dewatering well is holed and vertically downward, be finally positioned on the diaphragm of the second casing top mouth;
S42, then the tube wall of well casing is added the second cuff, the long 12m of well casing, use loop wheel machine to be winched to by well casing on the second strainer, the tube wall of well casing and the second strainer are spliced after getting well and freeze;
S43, finally by vertical for well casing sinking to boring in design at the bottom of elevation location, the design absolute altitude of the present embodiment is below ground 22.5m.
Except the relief well applied in the present embodiment, also replaceable one-tenth additive method reduces water level near the dewatering well that need hole, and can meet holes has water-head.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a hole forming method for dewatering well, is characterized in that: comprise the steps:
S1, around the dewatering well of preexisting hole, choose relief well position in certain limit, first use vibrating hammer the first casing is shaken heavy after, then carry out relief well boring;
S2, after described relief well is accomplished fluently, in described relief well, put into the first strainer, and draw water with water pump, before described dewatering well injection completes, ensure that in described relief well, water level is at certain height;
S3, measure described dewatering well with GPS well location after, use vibrating hammer to be shaken at described well location by the second casing heavy, shake after heavy end, carry out described dewatering well boring;
S4, sinking well casing, and evenly backfill gravel material in described well casing surrounding, after described gravel material is filled, use vibrating hammer clamp described second casing and extract, exist side by side to be engraved in described dewatering well and descend pump to carry out well-flushing;
S5, the tube wall of described well casing to be welded, extended to the length of needs.
2. the hole forming method of dewatering well according to claim 1, is characterized in that: in described step S1, around the dewatering well of preexisting hole 11m-15m scope in choose relief well position.
3. the hole forming method of dewatering well according to claim 1, it is characterized in that: in described step S1 and S3, the vibrating hammer heavy concrete grammar that shaken by casing is used to be: with the hydraulic chuck clamping casing of described vibrating hammer, guarantee that the center of suspension hook, vibrating hammer and casing is on a vertical straight line, shakes heavy while the verticality ensureing casing downwards.
4. the hole forming method of dewatering well according to claim 1, it is characterized in that: in described step S3, second casing comprises concentric cylinder and secondary lattice, casing in cylinder is provided with in described cylinder, be provided with casing in secondary lattice in described secondary lattice, in described cylinder, the length of casing is greater than casing in described secondary lattice.
5. the hole forming method of dewatering well according to claim 1, is characterized in that: in described step S3, and the concrete grammar of boring comprises the steps:
Topped up with water in S31, mud pit;
S32, when described relief well middle water level is reduced to specified altitude assignment, adjustment borer drill rod center and the second casing center superposition, and ensure that drilling rod is vertical;
S33, in the second casing, add clear water with described mud pit, start rig, the hole depth of dewatering well is increased by the drilling rod of rig described in adjunction, on joint, lubrication oil is coated with before described drilling rod adjunction, when the rod boring of spreading, use air pressure pump by the evacuating air of drilling rod after spreading, to ensure that slush pump can extract boring mud out;
S34, when at the bottom of the drill bit of described rig is lower than described second casing during absolute altitude, in boring, add swell soil, keep highly constant brill to move described drill bit modulation mud, after described mud modulation evenly, described drill bit slowly creeps into again;
The water level in guarantee second casing is needed to flush with the second casing top mouth in the whole process that S35, described drill bit creep into;
S36, when after described bit drills to design elevation, improve described drilling rod section by section.
6. the hole forming method of dewatering well according to claim 1, is characterized in that: the concrete grammar of sinking well casing in described step S4, comprises the steps:
S41, on the second strainer, add the first cuff, loop wheel machine is used to sling described second strainer, and being sunk in the boring of dewatering well, described second filter bits is in the center that described dewatering well is holed and vertically downward, be finally positioned on the diaphragm of described second casing top mouth;
S42, then the tube wall of described well casing is added the second cuff, use loop wheel machine to winch on the second strainer by described well casing, the tube wall of described well casing and the second strainer are spliced after getting well and freeze;
S43, finally by elevation location at the bottom of vertical for described well casing sinking to the design in described boring.
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| CN201510085120.0A CN104762981B (en) | 2015-02-16 | 2015-02-16 | A kind of forming hole method of dewatering well |
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| CN201510085120.0A CN104762981B (en) | 2015-02-16 | 2015-02-16 | A kind of forming hole method of dewatering well |
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| CN104762981B CN104762981B (en) | 2016-08-24 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105544573A (en) * | 2015-12-29 | 2016-05-04 | 中国水利水电第十三工程局有限公司 | Water pressure jetting type well completion construction method of dewatering tube well |
| CN107869146A (en) * | 2017-11-23 | 2018-04-03 | 北京地矿工程建设有限责任公司 | A kind of method with clean-out machine Dewatering well |
| CN109630192A (en) * | 2018-10-31 | 2019-04-16 | 广州地铁设计研究院股份有限公司 | A kind of precipitation method suitable for the construction of half diagenesis bored tunnel |
| CN110130378A (en) * | 2019-05-14 | 2019-08-16 | 长江水利委员会长江科学院 | A kind of novel implanted relief well decompression drainage system and method |
| CN110258453A (en) * | 2019-06-19 | 2019-09-20 | 长江水利委员会长江科学院 | A kind of impacting Lightweight relief well pipe and application method speedily carried out rescue work for flood season piping |
| CN110529042A (en) * | 2019-08-09 | 2019-12-03 | 天津建工城市建设发展有限公司 | A kind of forming hole method of dewatering well |
| CN115680497A (en) * | 2022-10-25 | 2023-02-03 | 天津大学 | Rapid well drilling device and method with filter tube and inner core drill rod separable |
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| CN110130378B (en) * | 2019-05-14 | 2019-12-27 | 长江水利委员会长江科学院 | Novel implantable decompression well pressure reduction and drainage system and method |
| CN110258453A (en) * | 2019-06-19 | 2019-09-20 | 长江水利委员会长江科学院 | A kind of impacting Lightweight relief well pipe and application method speedily carried out rescue work for flood season piping |
| CN110529042A (en) * | 2019-08-09 | 2019-12-03 | 天津建工城市建设发展有限公司 | A kind of forming hole method of dewatering well |
| CN110529042B (en) * | 2019-08-09 | 2021-09-24 | 天津建工城市建设发展有限公司 | Pore-forming method for dewatering well |
| CN115680497A (en) * | 2022-10-25 | 2023-02-03 | 天津大学 | Rapid well drilling device and method with filter tube and inner core drill rod separable |
| CN115680497B (en) * | 2022-10-25 | 2024-05-07 | 天津大学 | Quick well drilling device and method with separable filter tube and inner core drill rod |
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