CN107035376A - One kind common law in huge thick bedrock aquifer digs shaft construction method - Google Patents

One kind common law in huge thick bedrock aquifer digs shaft construction method Download PDF

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Publication number
CN107035376A
CN107035376A CN201710354520.6A CN201710354520A CN107035376A CN 107035376 A CN107035376 A CN 107035376A CN 201710354520 A CN201710354520 A CN 201710354520A CN 107035376 A CN107035376 A CN 107035376A
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construction
water
borehole
cash
hole
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CN107035376B (en
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王洪涛
薄其山
张连良
刘英锋
邢延团
郭小铭
曹延福
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Xian Research Institute Co Ltd of CCTEG
Shaanxi Changwu Tingnan Coal Industry Co Ltd
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Xian Research Institute Co Ltd of CCTEG
Shaanxi Changwu Tingnan Coal Industry Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D1/00Sinking shafts
    • E21D1/10Preparation of the ground
    • E21D1/105Preparation of the ground by water level modification

Abstract

Shaft construction method is dug the present invention relates to one kind, belongs to colliery technical field of construction, and in particular to one kind common law in huge thick bedrock aquifer digs shaft construction method.The present invention drills in pit shaft interior construction large aperture white-out first in the case where possessing underground drainage system, the screen casing formation spilled water hole in the suitable aperture of tripping in;Underworkings is docked with spilled water hole, unrestrained in advance to aquifer water progress, utilizes underground drainage system to carry out draining;Constructed during shaft construction using common law, while taking screen casing safeguard measure to protect spilled water hole.This method has broken pit shaft through that must use the understanding of construction freezing method during the huge thick rich water bedrock aquifers of more than 300m, reduces construction cost, accelerates the duration of a project, while preferably ensure that shaft construction quality.

Description

One kind common law in huge thick bedrock aquifer digs shaft construction method
Technical field
Shaft construction method is dug the present invention relates to one kind, belongs to colliery technical field of construction, and in particular to one kind is huge Common law digs shaft construction method in thick bedrock aquifer.
Background technology
At present, usually used shaft construction method is divided into conventional method and the class of specific process two, and conventional method includes general Logical method and slip casting method;Specific process includes freezing process, drop shaft sinking, boring method, screen sinking and well-point method etc..
In general, larger in mine shaft depth, and when needing guiding through the stronger huge thick bedrock aquifer of watery, due to general Water problems is prevented and treated in logical method and Draining hook method work progress to be difficult to solve, it is necessary to use pit shaft freezing method or semi-frozen method Construction.
Freezing process has obvious advantage in pit shaft is by deep bedrock aquifer and loose aquifer construction, applies It is relatively broad.It is many using equipment but the weak point of this method is that self well digging quantities is big, it is costly, the preparatory stage compared with It is long.For example, China Patent Publication No. CN103277103B, publication date on December 24th, 2014, innovation and creation it is entitled:One Plant well cutting and pass through the non-complete deep freezing method of huge thick rich water basement rock, this application case discloses one kind well in huge thick rich water basement rock The method that the non-full depth of tube construction is freezed, constructs quick compared with conventional freezing process, safe and efficient.Although its weak point is to adopt Carry out pit shaft semi-frozen method with associated construction technique, but still largely constructed freezing hole in water-bearing interval, it is impossible to fully achieved general Logical method construction, the construction period, expense was still higher compared with common law compared to relatively slowly.
The content of the invention
It is an object of the invention to:For being needed during shaft deepening through the huge thick preferable bedrock aquifer of watery The problem of, it can be harnessed the river on the premise of underworkings possesses drainage condition there is provided a kind of using the anti-of common law shaft construction Method, construction technology is simple, short time limit, cost are low, efficiently solves in huge thick bedrock aquifer and to be constructed pit shaft using common law Cutting is influenceed larger, costly, long in time limit by water damage, it is necessary to the problem of using construction freezing method.
The above-mentioned technical problem of the present invention is mainly what is be addressed by following technical proposals:
One kind common law in huge thick bedrock aquifer digs shaft construction method, comprises the following steps:
(1) constructed in the range of pit shaft special spilled water hole 1;
(2) retaining wall is carried out in the tripping in screen casing 2 of spilled water hole 1, underworkings docking spilled water hole 1 is entered using underground drainage system Row water-bearing layer is unrestrained;
(3) wellbore excavation is carried out;
(4) cut off to digging the aperture screen casing 2 of section spilled water hole 1, be capped aperture protection cap, continue to repeat (3).
Optimization, the above-mentioned common law in huge thick bedrock aquifer is dug in shaft construction method, step (1), is first adopted With small-bore rock bit compound drilling mode construction guidance hole, large aperture drill bit reaming is used after the completion of construction, is formed and sluiced Hole 1.
Optimization, the above-mentioned common law in huge thick bedrock aquifer is dug in shaft construction method, step (2), into Decentralization screen casing 2 in the spilled water hole 1 in hole, screen casing 2 is processed with sleeve pipe, sieve diameter 18mm, stays set one directly at a certain distance The hole of footpath 50mm sizes, connects after tunnelling with the spilled water hole, and carrying out water-bearing layer before Shaft Excavation and in digging process dredges Put, direct water into underground and carry out draining using underground drainage system.
Optimization, the above-mentioned common law in huge thick bedrock aquifer is dug in shaft construction method, step (2), is utilized Drilling rod processes spilled water hole block, and the sluicing cap includes steel pipe 3 and the hat shape backplate 4 with steel pipe vertical connection, the hat shape Side joint weldering side between backplate 4 and steel pipe 3.
Optimization, the above-mentioned common law in huge thick bedrock aquifer is dug in shaft construction method, step (3), need to be pressed Strata condition adjustment borehole arrangement and explosive payload;The big gun beyond detonation wave release aperture 5, release aperture 5 is set around tapping pipe 1 Eye increases explosive payload gradually.
Optimization, the above-mentioned common law in huge thick bedrock aquifer digs shaft construction method, and spilled water hole 1 deviates well In cylinder center arrangement, and step (3), bored using umbrella and take rope hose tool lowering drill pipes spilled water hole block in spilled water hole by force.
Optimization, the above-mentioned common law in huge thick bedrock aquifer is dug in shaft construction method, step (3), in well Wall water drenching concentrates location to stay and sets shuting installing space, shuting 6 is installed according to borehole wall water yield, by sebific duct shuting 6 Interior water is introduced below hanging scaffold, is arranged downwards by spilled water hole;In water-bearing interval construction double-layer wall of well 12, carried out using outer wall preliminary Water blockoff, borehole wall water drenching when reducing inner wall construction.
Optimization, the above-mentioned common law in huge thick bedrock aquifer is dug in shaft construction method, step (3), in pressure Air pipe line 7 increases high-intensity sealing pad, and water tank and draining pump are installed in upper hanging scaffold when sluicing hole plug, and immersible pump is by pit shaft Ponding drains into water tank, the discharge pipe line being transformed into by water pump and with air line 7, and ponding is drained into ground.
Optimization, the above-mentioned common law in huge thick bedrock aquifer digs shaft construction method, step (3) tool Body includes following sub-step:
Drill eye blasting sub-step, pit shaft is bored with 6 YGZ-70 rock drill rock drilling, diameter using SJZ-6.7 types umbrellaLong 4700mm drill steel,Bull bit jewel hole;The straight eye incremental extrusion explosion of strabismus formula slotting, borehole Depth is 4000mm;6 bench drills perforating simultaneously, powder charge uses T220 rock emulsion explosives, powder stick specificationInstead To coupling continuous charging, connection in series-parallel on line, electromagnetic detonators are ignited, the detonation of high frequency exploder, and detonation wave is set around spilled water hole 1 Borehole beyond release aperture 5 (empty eye), release aperture increases explosive payload gradually;
Go out that cash is levelling and clear bottom step, test after big gun terminates, air duct 8 is had to check for when going into the well whether there is to leak out, then progressively To hanging scaffold, greatly grab, the spoil in template and cutting shoe is cleared up, finally enter back into working face work, coordinated using excavator and grabbed Rock machine 9 is respectively charged into main hoppet 10 and the upper well of secondary hoppet 11 lifting, excavator close to the borehole wall and center steering simultaneously Tank nest is dug, dress cash is then concentrated to a well-bucket in well-bucket both sides;When such as running into fine and close epistasis rock, first with excavator pine Tank side is piled up after dynamic;After lower tank, grab loader 9 fills cash in tank side, and excavator fills cash when loosening;Spoil turns over cash through two platforms Afterwards, cash is filled to self-unloading discharge refuse car by forklift.Continue cash, and coordinating the clear bottom of center steering grab loader 9 using excavator.
Brushing sub-step, go out cash it is levelling when, helped for mud stone or facet arrears, go out cash while using pneumatic pick brushing;To big face Arrears are helped, and processing of drilling and blasting can be taken if necessary, i.e., 7655 type air drill perforatings are used while cash is gone out, band side is blown out, should Many perforatings, the method for few powder charge are taken, strabismus is beaten along pit shaft tangential direction, eye spacing is no more than 600mm, according to waste path position The good eye of suitable control is deep;, will together powder charge, line be blown out with working face after deficient side perforating during clear bottom.
Reinforcing bar colligation sub-step, when go out cash it is levelling enough build wall section it is high when, carry out reinforcing bar binding work.Perpendicular muscle use etc. is strong The straight screw sleeve of degree is mechanically connected, and joint is fastened with dental forceps, and reinforcing bar has been pricked, and it is good by joint protective to be backfilled with yellow ground;
Wall sub-step is built, rock section is built by laying bricks or stones using entire metal model board, double-layer wall of well 12 is used in bedrock aquifer section, Outer wall 300mm, inner wall thickness 450mm.Catchmented simultaneously when borehole wall water drenching amount increases using shuting 6, every 4~6 mould adds If one of shuting 6, a border is distributed 42 cun of sebific ducts and water is introduced below hanging scaffold, reduces borehole wall water drenching, it is ensured that borehole wall coagulation Soil property amount meets design requirement.
Therefore, the invention has the advantages that:For the stronger rich water bedrock aquifer of huge thickness, spilled water hole and underground are utilized Drainage system carries out comprehensive draining, thoroughly solves the problems, such as pit shaft water damage.Using common law operation, with freezing process conventional at present Compare, shorten duration, reduction engineering cost and management cost, pit shaft quality can be ensured well.
Brief description of the drawings
Fig. 1 pit shafts dig water damage preventing and treating schematic diagram;
Fig. 2 spilled water holes, screen construction schematic diagram;
Fig. 3 spilled water hole capping structure schematic diagrames;
Fig. 4-1 is rock section borehole layout drawing;
Fig. 4-2 is Fig. 4-1 sectional view;
Fig. 5 double-layer wall of well and wall seat schematic diagram;
Fig. 6 pit shaft excavating work facial plane layout drawings.
Embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment:
The present embodiment advance construction heavy caliber spilled water hole 1, the suitable aperture of tripping in spilled water hole 1 before pit shaft is dug Screen casing 2, guiding water-bearing layer underground water carries out white-out by drilling into underground drainage system so that pit shaft is dug position and is in More than the water-bearing layer water surface, it is that common law construction creates condition.
Shaft deepening common law construction method specifically includes following steps in huge thick bedrock aquifer:
(1) constructed in the range of pit shaft special spilled water hole 1;
(2) tripping in screen casing 2 carries out retaining wall inside spilled water hole, while improving underground drainage system;
(3) drill eye blasting, muck discharge refuse are carried out, the pick block machanized line such as wall is built;
(4) cut off to digging the screen casing 2 of section spilled water hole 1, be capped aperture protection cap 3, continue to repeat to dig to build engineering.
As a result of above-mentioned shaft deepening common law construction method, the device have the advantages that being:For huge Thick stronger rich water bedrock aquifer, carries out comprehensive draining using spilled water hole 1 and underground drainage system, thoroughly solves pit shaft water damage Problem.
Using common law operation, compared with freezing process conventional at present, duration, reduction engineering cost and management are shortened Cost, pit shaft quality can be ensured well.
The construction procedure in water hole is applied in lower mask body introduction.
Fig. 2 is the structural representation of spilled water hole 1.The drilling project amount of ventilating shaft spilled water hole 1 is 695.73m.Below construction to coal seam 3.62m.The engineering of spilled water hole 1 is first used using conventional roller boring operating type Rock bit compound drilling mode is constructed Pilot hole, the complete any one measuring point horizontal displacement of well is used in the range of 2m after the completion of constructionCombined drill reaming, shape Into spilled water hole 1.
Transferred in the spilled water hole 1 of pore-formingScreen casing 2, screen casing 2 is usedSleeve pipe process.Sieve aperture Diameter 18mm, stays the hole for setting a diameter 50mm size, welding position ensures firm at a certain distance.With being somebody's turn to do after tunnelling Spilled water hole 1 connects, and pre- thin drop is carried out before Shaft Excavation and is sluiced, draining is carried out using underground drainage system.
Spilled water hole block is processed using 3 cun of drilling rods, the long diameter 100mm steel pipes 3 of 9m are processed, it is suitable for reading to use diameter 400mm, The outer side joint weldering side of 20mm steel plates circle outer shroud, hat shape backplate 4 is soldered to diameter 100mm drilling rods upper port (Fig. 3).Utilize this lid Cap covers the aperture of spilled water hole 1, prevents spoil from slipping into blocking spilled water hole 1 in spilled water hole 1.
According to the technical characteristic and geological conditions of pit shaft, pit shaft builds mixture operation side using the pick of well mechanical matching short section Formula is constructed, from SJZ-6.7 types umbrella brill, sinking shaft Special-purpose lifting machine, big well-bucket, grab loader 9, bulk metal large form and large-scale Loading machine with the lifting based on self-tipping type automobile, jewel hole, muck discharge refuse, build wall machanized line, working face lays situation such as Shown in Fig. 6.
Construction method includes following steps:
(1) drill eye blasting
Pit shaft is bored with 6 YGZ-70 rock drill rock drilling, diameter using SJZ-6.7 types umbrellaLong 4700mm pricker Bar,Bull bit jewel hole;The straight eye incremental extrusion explosion of strabismus formula slotting, borehole depth is 4000mm;6 bench drills are simultaneously Perforating, powder charge uses T220 rock emulsion explosives, powder stick specificationReverse coupled continuous charging, string is simultaneously Join on line, electromagnetic detonators are ignited, high frequency exploder detonation (Fig. 4-1, Fig. 4-2).Detonation wave release aperture 5 is set around tapping pipe Borehole beyond (empty eye), release aperture 5 increases explosive payload gradually.
(2) go out that cash is levelling and clear bottom
Test after big gun terminates, air duct 8 is first checked for when going into the well whether there is to leak out, then progressively grabbed to hanging scaffold, greatly, template and sword Spoil in pin is cleared up, and finally enters back into working face work.1 HZ-6 types grab loader 9 is coordinated to fill respectively using excavator Enter well on kibble hoist, excavator digs tank nest simultaneously close to the borehole wall and center steering, then in well-bucket both sides to a well-bucket collection Middle dress cash;When such as running into fine and close epistasis rock, tank side is piled up after being loosened first with excavator;After lower tank, grab loader is filled in tank side Cash, excavator fills cash when loosening;After spoil turns over cash through two platforms, cash is filled to self-unloading discharge refuse car by forklift.Continue cash, and Coordinating the clear bottom of center steering grab loader using excavator.
(3) brushing
Go out cash it is levelling when, helped for mud stone or facet arrears, go out cash while using pneumatic pick brushing;Side is owed to large area, it is necessary When can take processing of drilling and blasting, i.e., while cash is gone out using 7655 type air drill perforatings, blow out band side, should take many perforatings, The method of few powder charge, beats strabismus, eye spacing is no more than 600mm, according to the good eye of waste path position suitable control along pit shaft tangential direction It is deep;, will together powder charge, line be blown out with working face after deficient side perforating during clear bottom.
(4) reinforcing bar colligation
When go out cash it is levelling enough build wall section it is high when, carry out reinforcing bar binding work.Perpendicular muscle uses equicohesive straight screw sleeve machine Tool is connected, and joint is fastened with dental forceps, and reinforcing bar has been pricked, and it is good by joint protective to be backfilled with yellow ground.
(5) wall is built
Rock section is built by laying bricks or stones using entire metal model board, and double-layer wall of well 12 is used in bedrock aquifer section, and outer wall 300mm is interior Wall thickness 450mm.Catchmented simultaneously when borehole wall water drenching amount increases using shuting 6, every 4~6 mould is added to intercept water together Groove a, border is distributed 42 cun of sebific ducts and water is introduced below hanging scaffold, reduces borehole wall water drenching, it is ensured that borehole wall concrete quality meets Design requirement.Meanwhile, one group of wall seat 13 of respectively being constructed in pit shaft loess formation bottom, bedrock aquifer bottom, it is ensured that wellbore stability (Fig. 5).
(5) screen casing 2 for exposing active face portion is cut off, aperture block is covered again, repeat above-mentioned operation flowing water, directly Completed to the bottomed construction of pit shaft.
Smoothly to realize and dig water damage preventing and treating to ensure that common law is constructed using pit shaft in spilled water hole progress water-bearing layer, it is main There are following technological difficulties:
(1) detonation wave easily breaks screen casing 2 in junction in work progress, or in the explosion wave coverage of screen casing 2 It is yielding, and spoil easily slipped in spilled water hole hole, by the hole plug that sluices, influence spilled water hole sluices;
(2) after mine shaft depth increase, borehole wall water drenching is easily caused in bedrock aquifer, deteriorates environment on coalface, the borehole wall is influenceed Concrete pouring quality.
For its technological difficulties, the solution mainly taken has:
(1) spilled water hole 1 deviates wellbore centre 1m arrangements;Bored using umbrella and take rope hose tool 3 cun of brills of decentralization 9m length in spilled water hole 1 by force The spilled water hole block 4 of bar processing, using the characteristics of drill pipe thickness is big, intensity is high, while core pipe exceed length of shot twice with On, blow out rear core pipe and spilled water hole is played a protective role, while ensureing by the hollow space of drilling rod 3 to enter when screen casing 2 is deformed Row is hydrophobic.
(2) according to the position of underground tapping pipe 1 and formation variations, adjustment borehole arrangement and explosive payload, prevent from blowing out and collapse in time Tapping pipe is squeezed flat blocking spilled water hole by disconnected tapping pipe and detonation wave.Meanwhile, detonation wave release aperture 5 is set around tapping pipe (empty Eye), the borehole beyond release aperture 5 increases explosive payload gradually.
(3) stayed in borehole wall water drenching concentrated position and set the installing space of shuting 6, shuting 6 is installed according to borehole wall water yield, The water in shuting 6 is introduced below hanging scaffold by 2 cun of sebific ducts, borehole wall water drenching is reduced, it is ensured that borehole wall concrete pouring quality is accorded with Close design requirement.
(4) in water-bearing interval construction double-layer wall of well 13, preliminary water blockoff is carried out using outer wall, and carry out pre-pouring grout, preliminary envelope Stifled borehole wall water burst, reduces water yield during inner wall construction, it is ensured that borehole wall construction quality.
(5) air line 8 is increased into strength seal pad, water tank and draining is installed in upper hanging scaffold when spilled water hole 1 is blocked Pit shaft ponding is drained into water tank by pump, immersible pump, the discharge pipe line being transformed into by water pump and with air line, and ponding is drained into Ground.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to of the invention The technical staff in field can make various modifications or supplement to described specific embodiment or use similar mode Substitute, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.

Claims (9)

1. one kind common law in huge thick bedrock aquifer digs shaft construction method, it is characterised in that comprise the following steps:
(1) constructed in the range of pit shaft special spilled water hole;
(2) retaining wall is carried out in spilled water hole tripping in screen casing, underworkings docking spilled water hole carries out water-bearing layer using underground drainage system It is unrestrained;
(3) wellbore excavation is carried out;
(4) cut off to digging section spilled water hole screen casing, be capped aperture protection cap, continue to repeat (3).
2. the common law according to claim 1 in huge thick bedrock aquifer digs shaft construction method, it is characterised in that In step (1), first using small-bore rock bit compound drilling mode construction guidance hole, large aperture drill bit is used after the completion of construction Reaming, forms spilled water hole.
3. the common law according to claim 1 in huge thick bedrock aquifer digs shaft construction method, it is characterised in that In step (2), screen casing is transferred in the spilled water hole of pore-forming, screen casing is processed with sleeve pipe, sieve diameter 18mm, at a certain distance The hole for setting a diameter 50mm size is stayed, is connected after tunnelling with the spilled water hole, is entered before Shaft Excavation and in digging process Row water-bearing layer is unrestrained, directs water into underground and carries out draining using underground drainage system.
4. the common law according to claim 1 in huge thick bedrock aquifer digs shaft construction method, it is characterised in that In step (2), spilled water hole block is processed using drilling rod, the sluicing cap includes steel pipe and protected with the hat shape of steel pipe vertical connection Plate, side joint weldering side between the hat shape backplate and steel pipe.
5. the common law according to claim 1 in huge thick bedrock aquifer digs shaft construction method, it is characterised in that , need to be by strata condition adjustment borehole arrangement and explosive payload in step (3);Detonation wave release aperture is set around tapping pipe, is discharged Borehole beyond hole increases explosive payload gradually.
6. the common law according to claim 1 in huge thick bedrock aquifer digs shaft construction method, it is characterised in that Spilled water hole deviates wellbore centre arrangement, and in step (3), is bored using umbrella and take rope hose tool lowering drill pipes sluicing port lid in spilled water hole by force Cap.
7. the common law according to claim 1 in huge thick bedrock aquifer digs shaft construction method, it is characterised in that In step (3), concentrate location to stay in borehole wall water drenching and set shuting installing space, shuting is installed according to borehole wall water yield, passed through Sebific duct introduces the trough inner water that intercepts water below hanging scaffold, is arranged downwards by spilled water hole;In water-bearing interval construction double-layer wall of well, outer wall is utilized Preliminary water blockoff is carried out, borehole wall water drenching when reducing inner wall construction.
8. the common law according to claim 1 in huge thick bedrock aquifer digs shaft construction method, it is characterised in that In step (3), high-intensity sealing pad is increased in air line, water tank and draining pump are installed in upper hanging scaffold when sluicing hole plug, Pit shaft ponding is drained into water tank by immersible pump, the discharge pipe line being transformed into by water pump and with air line, and ponding is drained into ground.
9. the common law according to claim 1 in huge thick bedrock aquifer digs shaft construction method, it is characterised in that The step (3) specifically includes following sub-step:
Drill eye blasting sub-step, pit shaft is bored with 6 YGZ-70 rock drill rock drilling, diameter using SJZ-6.7 types umbrellaIt is long 4700mm drill steel,Bull bit jewel hole;The straight eye incremental extrusion explosion of strabismus formula slotting, borehole depth is 4000mm; 6 bench drills perforating simultaneously, powder charge uses T220 rock emulsion explosives, powder stick specificationReverse coupled is continuously filled Medicine, connection in series-parallel on line, electromagnetic detonators are ignited, the detonation of high frequency exploder, set detonation wave release aperture (empty eye) around tapping pipe, release Borehole beyond discharge hole increases explosive payload gradually;
Go out that cash is levelling and clear bottom step, test after big gun terminates, air duct is had to check for when going into the well whether there is to leak out, then progressively to hanging Disk, grab greatly, the spoil in template and cutting shoe is cleared up, finally enter back into working face work, utilize excavator to coordinate grab loader Well on kibble hoist is respectively charged into, excavator digs tank nest simultaneously close to the borehole wall and center steering, then in well-bucket both sides to one Well-bucket concentrates dress cash;When such as running into fine and close epistasis rock, tank side is piled up after being loosened first with excavator;After lower tank, grab loader exists Tank side fills cash, and excavator fills cash when loosening;After spoil turns over cash through two platforms, cash is filled to self-unloading discharge refuse car by forklift.Continue Cash, and coordinating the clear bottom of center steering grab loader using excavator;
Brushing sub-step, go out cash it is levelling when, helped for mud stone or facet arrears, go out cash while using pneumatic pick brushing;Large area is owed Side, can take processing of drilling and blasting if necessary, i.e., 7655 type air drill perforatings are used while cash is gone out, band side is blown out, should be taken Many perforatings, the method for few powder charge, strabismus is beaten along pit shaft tangential direction, and eye spacing is no more than 600mm, suitably controlled according to waste path position Make eye deep;, will together powder charge, line be blown out with working face after deficient side perforating during clear bottom;
Reinforcing bar colligation sub-step, when go out cash it is levelling enough build wall section it is high when, carry out reinforcing bar binding work.Perpendicular muscle is using equicohesive straight Screw shell is mechanically connected, and joint is fastened with dental forceps, and reinforcing bar has been pricked, and it is good by joint protective to be backfilled with yellow ground;
Wall sub-step is built, rock section is built by laying bricks or stones using entire metal model board, double-layer wall of well, outer wall are used in bedrock aquifer section 300mm, inner wall thickness 450mm.Catchmented simultaneously when borehole wall water drenching amount increases using shuting, every 4~6 mould is added together Shuting a, border is distributed 42 cun of sebific ducts and water is introduced below hanging scaffold, reduces borehole wall water drenching, it is ensured that borehole wall concrete quality is accorded with Close design requirement.
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* Cited by examiner, † Cited by third party
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CN108397197A (en) * 2018-03-05 2018-08-14 中国水利水电第五工程局有限公司 A kind of suppleing level super thick soil property country rock shaft excavation method
CN109026010A (en) * 2018-08-13 2018-12-18 中煤能源研究院有限责任公司 A kind of mine seepage well slip casting type sinking shaft construction method
CN111734416A (en) * 2020-07-10 2020-10-02 中煤特殊凿井有限责任公司 Construction method for deep water-rich rock shaft by common freezing method

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