CN102536247A - Construction method of still-water cement grout pad - Google Patents
Construction method of still-water cement grout pad Download PDFInfo
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- CN102536247A CN102536247A CN2010106164844A CN201010616484A CN102536247A CN 102536247 A CN102536247 A CN 102536247A CN 2010106164844 A CN2010106164844 A CN 2010106164844A CN 201010616484 A CN201010616484 A CN 201010616484A CN 102536247 A CN102536247 A CN 102536247A
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Abstract
The invention provides a construction method of a still-water cement grout pad. The construction method comprises the following steps of: performing construction design and mounting a pipeline platform; suspending and lowering a slurry sliding pipe into a vertical shaft by using mechanical equipment in a vertical shaft construction field, and fixing the slurry sliding pipe on a pipeline platform beam at a wellhead; pouring the cement grout pad by using the slurry sliding pipe when the water level of a shaft is under a still water state, and regulating the height of the slurry sliding pipe according to cement consumption and pouring thickness changes during pouring; testing the settling time, setting time and consolidation strength of poured cement slurry; carrying out shaft drainage and grouting water plugging construction after the maintenance time of the cement grout pad is up; and finally removing the cement grouting pad. By utilization of the method, the cement slurry grout pad can be constructed underwater under the condition that the vertical shaft is not drained, existing equipment for vertical shaft construction can be utilized, and therefore, the advantages of less investment, simple process, high construction speed and favorable water plugging effect are achieved.
Description
Technical field
The present invention relates to the unexpected water burst in the vertical shaft for mine shaft bottom technical field of construction of harnessing the river, more particularly, relate to a kind of hydrostatic cement grout cover job practices.
Background technology
At present, mining goes to deep mining by strip mining transformation gradually, and the flood of thereupon bringing is very outstanding; Deep shaft construction period particularly; Work plane gushing water occurs and causes the accident of flooding well a lot, and therefore, how after flooding the well accident, to resume production as early as possible becomes the important topic of vertical shaft for mine construction.
Up to the present, mine is flooded the back is taked to force to arrange fast water burst in the completion tube, the construct measure of grout cover water blockoff again more, and most grout cover is an employing concrete grout cover.And must drain the ponding of work plane before the construction of concrete grout cover, otherwise be difficult to successfully, simultaneously, the site operation personnel will be at subaqueous work, and constructor's labour intensity is quite big, and the engineering time is quite long again, and effluent cost is quite high.So, traditional finish the method for laggard capable grout cover construction in draining, time-consumingly take risks again.
The well accident is flooded in processing to be needed to carry out according to the condition particularly of growing the different geological conditionss of each mine such as area like solution cavity, solution crack and fault belt.Solution cavity, solution crack are generally all communicated with each other, and generally are connected with the face of land, if meet rainy season or surface drainage developed regions, along with the increasing of surface water, the down-hole water burst is also continuing to increase.If forced drainage in this case; Will certainly cause the somewhere surface subsidence; Even cause the geological disaster of subsiding of face of land important building etc., so the measure of under this kind condition, adopting traditional draining to finish back construction concrete grout cover has been impracticable.
Therefore, need a kind of method that can carry out the grout cover construction under can't the situation of forced drainage, with the reduction engineering time, improve efficiency of construction, and in the construction of carrying out the concrete grout cover in the well accident of flooding that should not forced drainage, to resume production as early as possible.
The grout cover technology mainly contains concrete grout cover, jackstone slip casting grout cover, coarse sand slip casting grout cover etc. under the domestic water; But concrete segregation takes place in the work progress of underwater concrete grout cover easily; Configuration material that adopts and the variation of transporting equipment can increase process procedure and construction cost in order to prevent to emanate, and prolongation is harnessed the river the duration; The construction of jackstone slip casting grout cover and coarse sand slip casting grout cover then can destroy the former borehole wall of having constructed, not only can prolong the duration, also can increase construction cost greatly.
Summary of the invention
In view of the above problems, the purpose of this invention is to provide a kind ofly under the situation of not draining of vertical shaft, utilize the cost of vertical shaft construction existing equipment low, the job practices of the simple underwater cement slurry of technology grout cover.
According to an aspect of the present invention, a kind of hydrostatic cement grout cover job practices is provided, has comprised:
The working design that vertical shaft water burst situation through to the job site is checked, the curing time of cement grout concentration, cement grout cover thickness, cement consumption and grout cover is carried out in monitoring;
Adopt the mode installation pipeline platform of girder and auxiliary girder overlap joint at the vertical shaft well head;
Utilize the existing field plant equipment of said vertical shaft construction to couple together through flange, bolt and suspend in midair and transfer to vertical shaft as slipping φ 108 steel pipes that slurry manages; And measuring table, the end opening transferred to suitable for reading that makes said slide slurry pipe is fixed on said slide slurry pipe on the pipeline landing beam of well head near said vertical shaft shaft bottom work plane then;
Be under the hydrostatic state at said pit shaft water level, carry out the perfusion of cement grout cover, and between flush phase, adjust the height of said slide slurry pipe according to the cement consumption and the variation of perfusion thickness through said slide slurry pipe;
Utilize test bottle to test sedimentation time, time of setting and the cementing strength of cement injection slurries, to confirm the curing time of cement grout cover;
The said cement grout cover of maintenance, and after the curing time of said cement grout cover finishes, carry out the construction of pit shaft draining, grouting for water blocking;
Finish in said grouting for water blocking construction, remove said cement grout cover.
Utilize above-mentioned according to hydrostatic cement grout cover job practices of the present invention, the cement paste grout cover of can under the situation of not draining of vertical shaft, constructing under water, and vertical shaft capable of using construction existing equipment, small investment, technology is simple, speed of application is fast, water plugging effect is good.
In order to realize above-mentioned and relevant purpose, one or more aspects of the present invention comprise the characteristic that the back will specify and in claim, particularly point out.Following explanation and accompanying drawing have specified some illustrative aspects of the present invention.Yet, the indication of these aspects only be some modes that can use in the variety of way of principle of the present invention.In addition, the present invention is intended to comprise all these aspects and their equivalent.
Description of drawings
Through with reference to below in conjunction with the explanation of accompanying drawing and the content of claims, and along with to more complete understanding of the present invention, other purpose of the present invention and result will understand and should be readily appreciated that more.In the accompanying drawings:
Fig. 1 is a hydrostatic cement grout cover construction technology sketch map of the present invention;
Fig. 2 shows the flow chart according to hydrostatic cement grout cover construction technology of the present invention;
Fig. 3 shows among the present invention the embodiment sketch map of a rig, slurry filling machine operating platform;
Fig. 4 shows the plan view of inlet well wellbore arrangement embodiment of the present invention;
Fig. 5 shows according to grouting construction process flow chart of the present invention.
Identical label is indicated similar or corresponding feature or function in institute's drawings attached.
The specific embodiment
Below will combine accompanying drawing that specific embodiment of the present invention is described in detail.
For can be more concrete description technical scheme of the present invention in detail; To be example with a concrete hydrostatic cement grout cover construction process below, the job practices of hydrostatic cement grout cover described from working design, work progress, three aspects of construction results.
Working design
Because hydrostatic cement grout cover is seldom used in existing construction note; Basically few of relevant data information and construction regulations can references; Therefore; Before construction, need at first carry out working design, the checking computations construction parameter data of being correlated with are comprising curing time of cement grout concentration, grout cover thickness, cement consumption and grout cover etc.
Fig. 1 shows according to hydrostatic cement grout cover construction technology sketch map of the present invention.
In Fig. 1,1. represent stable car wire rope suspensioning Φ 108 steel pipes; 2. connect the JS-750 mixer; 3. for slipping ash bucket; 4. starch the adpting flange between pipe for slipping; 5. be the suspention jig; 6. serve as reasons to slip and starch the grouting pipeline that pipe is formed by connecting; 7. restrict for the suspension wire of grouting pipeline; 8. be borehole wall issue; 9. be the slurries snubber.In this specific embodiment, the pit shaft static level absolute altitude of vertical shaft is+51.6m that shaft bottom absolute altitude-43.0m confirms depth of water 94.6m, shaft bottom hydraulic pressure 0.946Mpa.According to the coagulating property of cement grout, can know that water/binder ratio is 1: 1 straight cement slurries, compressive strength reaches 2.42Mpa after 14 days, is far longer than the pressure of water.Therefore, can utilize the existing construction equipment in vertical shaft job site, adopt the castinplace pile principle, the ash guiding pipe end opening is transferred to the shaft bottom, make cement grout utilization deadweight impact force come the cement injection grout cover to the mode of diffusion all around.In order to ensure cement grout intensity, preferably water/binder ratio is brought up to 0.5: 1～1: 1, select PO.42.5 cement simultaneously for use, the calculus compressive strength of the cement grout after 14 days will reach 15.3Mpa like this, reaches the construction requirement of grout cover.In this embodiment, water/binder ratio was located 0.5: 1.
After having confirmed the concentration of cement grout, also need to confirm the thickness of the cement grout cover of needs perfusion according to the calculus compressive strength of deciding the cement grout of concentration.Can know according to existing technical data, in hard rock, when grouting pressure reaches 8.0Mpa～12.0Mpa; Slip casting rock cap thickness is 3.0～4.0m; And the calculus intensity of cement grout is far away from rock strength, and therefore, the cement grout cover is not destroyed when guaranteeing to pour into; Guarantee perfusion effect, confirm the thickness of cement grout cover according to engineering analogy method commonly used in existing perfusion slurry data and the working design process.Forming process according to rock grouting rock cap; The area in the thickness of grout cover and pit shaft cross section has confidential relation; The thickness of grout cover increases along with the increasing of shaft section; Usually the thickness of the grout cover of specification vertical shaft is 6～8m, in order to strengthen safety factor, can select bigger one-tenth-value thickness 1/10.In the present embodiment the thickness of hydrostatic cement grout cover is confirmed as 8m.
After having confirmed the thickness of concentration, grout cover of cement grout, the real size parameter that just can combine to flood the well vertical shaft is calculated the needed cement consumption of slip casting cement grout cover.
As shown in Figure 1, flood in the present embodiment in the design of well work shaft, shaft bottom quarrel face absolute altitude is-40.0m; Supporting wellbore section bottom surface absolute altitude is-36.9m; So supporting wellbore section height is not 3.1m, the radius of supporting wellbore section is not the 3.3m (not shown), and the radius of supporting wellbore section is the 2.9m (not shown); Therefore
Supporting wellbore section volume is not: Q hair=3.14 * 3.3 * 3.3 * 3.1=106 (m
3)
Because the thickness of hydrostatic cement grout cover is 8m, taken 3.1m at supporting wellbore section not, then also need pour into the grout cover that thickness is 8-3.1=4.9m at the supporting wellbore section, therefore,
Supporting wellbore section volume is: Q is clean=and 3.14 * 2.9 * 2.9 * 4.9=129.4 (m
3)
The cement paste water/binder ratio calculated by 0.5: 1, and the calculus rate is by 0.85, and then cement calculating consumption is:
(Q hair+Q is clean) * 1200 ÷ 1000 ÷ 0.85=332.3 (t)
Wherein, concerning 0.5: 1 cement grout, every side's slurries cement consumption was 1200kg, and 1000 for kg is converted into the coefficient of ton, usually in the shaft building handbook, can find the definite foundation and the computational methods of above-mentioned data.
On the basis of the accurate cement consumption of 332.3t, add certain middle loss, confirm that finally the cement use amount is: 335t.
The curing time of cement grout cover can be confirmed according to the factors such as requirement of concentration, key property and the construction period of use cement paste; In this specific embodiment; According to the key property of neat slurry and the urgency of construction period, cement grout cover curing time is confirmed as 10 days.
Then, be exactly the preparation of the installation of the slide of cement injection grout cover slurry pipe and construction equipment.An important feature of the present invention is exactly to utilize the current material and the equipment of vertical shaft job site; Do not increase the additional apparatus expenditure; Therefore; Adopt vertical shaft job site φ 108 steel pipes commonly used for slipping the slurry pipe, utilize existing hoist engine, mixer to accomplish the installation of slurry pipe and the stirring work of cement grout of slipping in the present embodiment, must not increase other equipment.
Slipping aspect the selecting for use of slurry pipe; With the thinner easy plugging of steel pipe, be not easy to install, remove with thicker steel pipe, must buy in addition with the steel pipe of φ 63～89; Use φ 108 steel pipes can plugging for slipping that the slurry pipe not only can ensure when transferring cement grout not; And, can not increase extra material configuration cost, and be convenient to install as the current material of job site.
Thereby utilizing on-the-spot tubing and plant equipment to stir, carry cement grout to reduce investment outlay greatly reduces construction cost and improves efficiency of construction.
Slipping aspect the concrete installation of slurry pipe, only need at well head installation pipeline platform, install then and transfer φ 108 steel pipes one time and get final product as slipping the slurry pipe.
For ensure the operation of perfusion slurry can be continuously, effectively carry out, in this specific embodiment, divide class Three's operation with the job site, per tour Beater operator, put each one of grey worker, maintenance mans, electrician, elevator worker, technician, amount to 6 people, class Three amounts to 18 people.
Fig. 2 is the flow chart according to hydrostatic cement grout cover construction technology of the present invention, and is as shown in Figure 2, and the construction process of hydrostatic cement grout cover provided by the invention is following:
At first, measure the water surface, see whether the water surface of pit shaft is in the hydrostatic state, this is the prerequisite that the present invention carries out the construction of cement grout cover;
Then, the actual grade at the bottom of the measuring well so that confirm grout cover thickness, slip the slurry pipe transfer working design parameter such as the degree of depth;
After working design is accomplished, utilize on-the-spot construction equipment the ease of Use platform to be installed, for the installation of slide slurry pipe, the perfusion of cement grout are prepared at well head;
The making of cement grout priming line, installation;
Utilize the mixer of the vertical shaft job site slurries that mix cement, and carry out the perfusion of cement grout cover;
Do the real test of test, to confirm the curing time of cement grout cover;
Accumulative total behind the observation water mud liquid precipitate is thick, to determine whether to reach the perfusion requirement of cement grout cover;
The cement grout cover that the maintenance perfusion finishes;
Whether the color that curing time carries out draining and observation post's draining of pit shaft after finishing is successful to confirm ending slurry;
After confirming only to starch successfully, carry out grouting for water blocking;
Grouting for water blocking finishes, excavation cement grout cover, checking water plugging effect;
After confirming that water blockoff success, vertical shaft construction environment are normally, recover the driving and masonry construction of vertical shaft.
Work progress
According to construction process shown in Figure 2; After accomplishing working design; Just can be to instruct to have carried out construction operation with the working design, the process of construction operation mainly comprises four parts: the construction of well head installation pipeline platform, the construction of perfusion slurry pipeline, perfusion, the mortar depositing construction of hydrostatic cement grout cover.
In the construction operation process, at first need make well head installation pipeline platform, the mode that generally is employed in well head overlap joint girder and auxiliary girder is set for this platform.In this specific embodiment; The concrete work progress of well head installation pipeline platform is: open the vertical shaft trapdoor; Two long 4 meters φ, 28 longerons (auxiliary girder) are installed on the closure plate girder; Two crossbeams (auxiliary girder) are installed on longeron, girder and longeron, crossbeam and longeron are connected with bolt, the 7cm plank is as operating platform on the crossbeam upper berth.
In another embodiment of the present invention, then adopt two girders, six roots of sensation auxiliary girder to set for this platform, it is as shown in Figure 3 that it builds mode.Fig. 3 is rig, slurry filling machine operating platform sketch map, and in Fig. 3,1A, 1K are respectively left and right sides girder; 2,3 for being installed in the auxiliary girder on the girder 1; 4 is the adjustable segmented column leg of operating platform; 5 is the boring of after the grout cover construction is accomplished, implementing slip casting.
In the work progress of making, installing at pipeline, the slide slurry pipeline that this specific embodiment adopted is φ 108 * 4 (diameter of steel pipe is 108mm, and the wall thickness of steel pipe is a 4mm) steel pipe, utilizes the air duct stable car to suspend in midair and transfers.Suspention is slipped and to be connected with jig between wire rope and the steel pipe of slurry pipe, and through flange, bolt connection, for the tight type and the soundness that ensure connection, bolt all adopts high-strength bolt, and the stiffened panel reinforcement of weld between the steel pipe.Measuring table, the end opening transferred to suitable for reading that the slurry that slips is managed slips and starches the as close as possible wellbore centre of pipeline near vertical shaft shaft bottom work plane, and is fixed on the pipeline landing beam of well head with wire rope.The distance that the slurry that slips is managed end opening and shaft bottom work plane can require according to the pouring construction of existing grout cover to confirm; Usually the thickness according to the cement grout that is poured into about 0.4～0.8m, and in work progress improves the distance between end opening and the shaft bottom work plane gradually.
After slide slurry pipe was transferred fully, the length of transferring steel pipe in the present embodiment was 109m through actual measurement.For the ease of during lift line, progressively removing unnecessary slide slurry pipe, upper pipeline is installed 2 meters long short steel pipes of 5 joints (φ 108 pipes).As cement injection slurries 70m
3After (84t cement), after this 1 meter of lift line, gets into supporting section pit shaft grout injection.Promote 1 mitron road during every perfusion 30m3 (36t cement),, accomplish until 8 meters grout covers so that priming line grout outlet 1 meter buried depth (castinplace pile principle) in the cement grout Rio all the time guarantees that slurries do not dilute.
In addition; In this specific embodiment,, make the cement grout in the mixer get in the steel pipe smoothly for mixer is docked with slide slurry pipe; Also slip slide ash bucket of steel pipe installation suitable for reading of slurry pipe, and slipping slurries buffer board that is slightly less than pipeline diameter of steel pipe end opening welding of slurry pipe.The effect of slurries buffer board is to make slurries to diffusion all around, does not fling the shaft bottom, makes the cast of grout cover even laminating, in order to avoid cause hydrostatic cement grout cover zap pit to occur.
After equipment, pipeline, cement injection slurries all are ready to, just can begin the pouring construction of hydrostatic cement grout cover.Concrete work progress is following:
At first, before perfusion, observe the variation of pit shaft water level in detail, not changing, be under the hydrostatic state, can carry out the perfusion of cement grout cover at guaranteed water level.
In this embodiment, the JS-750 mixer that adopts well head the to install slurry that mixes cement, through slip ash-pit, slip grey movable joint with mixer with pit shaft in mounted slide ash bucket couple together, the beginning continous pouring is constructed.Between flush phase, need to measure at any time the perfusion degree of depth, observing the variation of cement consumption and perfusion thickness, thereby in time adjust the height of priming line.
Simultaneously, in order in time to test sedimentation time, time of setting and the cementing strength of cement grout, in this specific embodiment; 3 tests have also been arranged; Test method is after the perfusion of cement grout cover finishes, and adds cement grout earlier, slowly adds water again with beverage bottle, is suspended to apart from well head 80m depths with hundred meters lining ropes; Make it to be in and the same environment of cement grout cover; According to the delivery test report of cement, well head was proposed test bottle, sedimentation time, time of setting, the cementing strength of observation cement grout respectively at 1 day, 3 days, 8 days.Through the analytical test result, confirming to arrange the cement grout cover curing time of pit shaft draining then, specifically is being in the example at this, and the curing time through the determined cement grout cover of above-mentioned test is 10 days.
After the construction of cement grout cover is accomplished and is able to arrange the curing time of pit shaft draining, just can carry out the construction of pit shaft draining, grouting for water blocking.In the process of draining, need the color of observation post's draining, confirming whether to also have swelling to go out in the pit shaft, this also is a whether aspect of generation effect of check grout cover.If in drainage procedure, there is not yellow muddy water to occur, and water level descends rapidly, proves that the cement grout cover successfully blocks the shaft bottom issue, just can carry out the construction of grouting for water blocking at work plane according to the layout of pit shaft inlet well.
Fig. 4 is the embodiment sketch map that the design plane of inlet well among the present invention is arranged; In Fig. 4; (1), (2), (3), (4), (5), (6), (7), (8) are for the inlet well numbering, from these several holes, inject cement grout respectively, to block the issue of shaft bottom work plane.
Mortar depositing construction is one critical process in the slip casting operation, and grouting pump must guarantee a job for this reason, and one subsequent use, necessarily requires strict control, and conscientiously operation is to guarantee grouting quality and water plugging effect.Fig. 5 is according to grouting construction process flow chart of the present invention, and is as shown in Figure 5, in the slip casting, should accomplish following groundwork:
When (1) stirring slurries by the design proportioning, charging sequence is for discharging water, after add cement, after stirring, put into reserve pit, for preventing the slurries deposition, in inhaling stock tank, continue to stir, and slurry specific gravity is measured in timing.Guarantee to supply continuously slurry, to satisfy the requirement of injection rate.
(2) the slurries initial concentration is selected: because during the slip casting; Need to verify with rarer slurries slip casting earlier the injection rate of inlet well, concrete injection rate confirms according to the boring water absorption, therefore; Generally speaking, the initial concentration of cement paste is undertaken by 1.5: 1 proportioning.
(3) before slip casting began, reserve pit should prepare the slurries of design proportioning, and record slurries amount.Slip casting begins, and closes grouting valve, opens waster valve, starts grouting pump when letting out the slurry pipe evenly during plasma discharge, closes waster valve simultaneously, opens grouting valve, and formally slip casting begins.During each the shutdown, should close grouting valve, open waster valve simultaneously, and pulp-absorbing pipe is put into Rinsing Area, inhale flushing with clean water pump and grouting pipeline, after pipeline cleans up, can finish this slip casting work.
(4) in the slip casting process, guarantee that grouting pump runs well, start stand by pump immediately, guarantee continuous slip casting, and in time overhaul the grouting pump that breaks down if break down.
(5) all should detail record to every hole grouting pressure, injection rate and all abnormal phenomenas, and carry out on-the-spot shift system, the slip casting of every hole should be analyzed the parameter that is write down after finishing, reference during for the slip casting of next hole.
(6) after every hole slip casting finishes, or stop for some reason to annotate, should press and annotate a certain amount of clear water, the water yield can make the slurries that exist in the feed pipe for mortar also be pressed in the hole substantially, reduces the slurries waste.
(7) uninterrupted slip casting: in the slip casting process, generally speaking, slip casting should not be interrupted, and answers continuous slip casting in 24 hours, thereby must guarantee that reserves, transportation and the slip casting personnel scene of cement relieve.
(8) intermittently slip casting: after the slip casting for the first time, all shutoff of some crack, even tiny crack do not advance slurry as yet, must answer notes and just can reach the slip casting standard.Annotating number of times again looks the last remaining water yield that crack size, what, the effect just annotated and slip casting require and confirms.Intermittently the time of slip casting was generally 24 hours, annotated mode again, adopted the disposable slip casting in full hole, reached the slip casting ending standard and got final product.
(9) preliminary treatment slip casting: too fast in the slip casting process when the pressure rising, reduce rapidly or packer permeability test and inhale slurry, unit setting-out amount should be carried out the slip casting preliminary treatment less than 0.1L/min.m.m, and its method is that pressure is annotated the 2m3 clear water, presses and annotates 2～3m
3300 water glass, and then press to annotate the clear water of 1～2m3 again, like this after the preliminary treatment, the obvious fluence of increase slurries.
After shaft bottom work plane slip casting is accomplished, just can remove the cement grout cover.In this specific embodiment; The cement grout cover that discloses out through observation; Find because the grout cover upper surface has the mud of deposition to cover, and the cement grout top layer reason of diluting under water, cement stone setting strength is more lower slightly than the intensity of expection; But do not influence the pit shaft slip casting effect, prove that the job practices of hydrostatic cement grout cover of the present invention is scientific and reasonable.
In this specific embodiment, the measurement during through last dismounting cement grout cover finds that the actual (real) thickness of the grout cover of final construction has deviation slightly with calculating, and the pit shaft height of the not supporting section of actual exposed is 2.8m, is 5.2m at the pit shaft height of supporting section.The actual volume of hydrostatic grout cover is:
Q hair+Q is clean=3.14 * 3.3 * 3.3 * 2.8+3.14 * 2.9 * 2.9 * 5.2=233.1 (m
3)
Actual cement consumption 335t considers the influence of shaft bottom deposition mud, and the calculus rate of its cement grout is:
233.1×1200÷1000÷335＝0.835
Calculus rate low 0.015 than expection.
Can find out through above-mentioned specific embodiment, compare following advantage with the concrete grout cover according to the hydrostatic cement grout cover that technology provided by the present invention is constructed:
(1), the slurry pipeline diameter that slips can select φ 108 steel pipes, reduce investment outlay, and be convenient to install.When transferring slurries, can plugging, can improve efficiency of construction.
(2), cement grout has only a kind of material, when transferring, do not have segregation phenomenon.
(3), cement grout falls by deadweight, must not pressurize, and behind the shaft bottom, can evenly spread out, can bulk deposition at a place, the low phenomenon in high both sides in the middle of causing.And, be easy to grasp shaft bottom mortar height according to transferring the slurries amount.
(4), cement grout is not owing to emanate, the compactness that forms grout cover is better, it is high a lot of to compare the concrete success rate.
The hydrostatic cement grout cover job practices that the present invention adopted can be under the situation of not draining of vertical shaft, the cement paste grout cover of directly constructing under water; Not only can overcome the job site can not draining, the defective of inconvenient draining is in time carried out the construction of grout cover fast; The existing equipment of vertical shaft also capable of using job site, small investment, technology is simple; Speed of application is fast, and water plugging effect is good.
As above describe according to hydrostatic cement grout cover job practices of the present invention with the mode of example with reference to accompanying drawing.But, it will be appreciated by those skilled in the art that the hydrostatic cement grout cover job practices that proposes for the invention described above, can also on the basis that does not break away from content of the present invention, make various improvement.Therefore, protection scope of the present invention should be confirmed by the content of appending claims.
Claims (10)
1. hydrostatic cement grout cover job practices comprises:
The working design that vertical shaft water burst situation through to the job site is checked, the curing time of cement grout concentration, cement grout cover thickness, cement consumption and grout cover is carried out in monitoring;
Adopt the mode installation pipeline platform of girder and auxiliary girder overlap joint at the vertical shaft well head;
Utilize the existing field plant equipment of said vertical shaft construction to couple together through flange, bolt and suspend in midair and transfer to vertical shaft as slipping φ 108 steel pipes that slurry manages; And measuring table, the end opening transferred to suitable for reading that makes said slide slurry pipe is fixed on said slide slurry pipe on the pipeline landing beam of well head near said vertical shaft shaft bottom work plane then;
Be under the hydrostatic state at said pit shaft water level, carry out the perfusion of cement grout cover, and between flush phase, adjust the height of said slide slurry pipe according to the cement consumption and the variation of perfusion thickness through said slide slurry pipe;
Utilize test bottle to test sedimentation time, time of setting and the cementing strength of cement injection slurries, to confirm the curing time of cement grout cover;
The said cement grout cover of maintenance, and after the curing time of said cement grout cover finishes, carry out the construction of pit shaft draining, grouting for water blocking;
Finish in said grouting for water blocking construction, remove said cement grout cover.
2. hydrostatic cement grout cover job practices as claimed in claim 1, wherein,
Said cement grout concentration is water/binder ratio 0.5: 1～1: 1;
The thickness of said cement grout cover is 6～8m.
3. hydrostatic cement grout cover job practices as claimed in claim 2, wherein,
Confirm the curing time of said grout cover according to said cement grout concentration, cement key property and the requirement of construction period.
4. hydrostatic cement grout cover job practices as claimed in claim 3, wherein,
Adopt high-strength bolt to connect the flange that said slide slurry is managed two ends, and the stiffened panel reinforcement of weld.
5. hydrostatic cement grout cover job practices as claimed in claim 4, wherein,
The upper pipeline of said slide slurry pipe is continuous 2 meters long φ 108 steel pipes of 5 joints.
6. hydrostatic cement grout cover job practices as claimed in claim 5, wherein,
In the process of transferring said slide slurry pipe, the suspention that utilizes the air duct stable car to carry out said slide slurry pipe is transferred, and is connected with jig between the wire rope that suspends said slide slurry pipe in midair and the steel pipe.
7. hydrostatic cement grout cover job practices as claimed in claim 6, wherein, said concrete work progress at well head installation pipeline platform is:
Open the vertical shaft trapdoor, two long 4 meters φ, 28 longerons are installed on the closure plate girder two crossbeams are installed on longeron, girder and longeron, crossbeam and longeron are connected with bolt, boarding is as operating platform on crossbeam.
8. hydrostatic cement grout cover job practices as claimed in claim 7, wherein,
In the filling process of cement grout cover; Thickness according to the cement grout that is poured into promotes said slide slurry pipe gradually; So that said slide slurry is managed grout outlet 1 meter buried depth in cement grout all the time, and during lift line, progressively remove unnecessary slide and starch pipe from the top of said slide slurry pipe.
9. hydrostatic cement grout cover job practices as claimed in claim 8, wherein,
Starch the installation suitable for reading one slide ash bucket of pipe in said slide, and starch the end opening of managing in said slide and weld a slurries buffer board less than pipeline diameter.
10. hydrostatic cement grout cover job practices as claimed in claim 9 wherein, adopts the mixer of the said vertical shaft job site slurries that mix cement, and said mixer grout outlet is connected with said slide ash bucket through slipping ash-pit, the grey movable joint that slips.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010616484.4A CN102536247B (en) | 2010-12-30 | 2010-12-30 | Construction method of still-water cement grout pad |
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| CN201010616484.4A CN102536247B (en) | 2010-12-30 | 2010-12-30 | Construction method of still-water cement grout pad |
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| CN102536247A true CN102536247A (en) | 2012-07-04 |
| CN102536247B CN102536247B (en) | 2014-07-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109209387A (en) * | 2018-09-17 | 2019-01-15 | 龙口矿业集团有限公司 | Concrete grout cover construction method under deep water level |
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| CN109209387A (en) * | 2018-09-17 | 2019-01-15 | 龙口矿业集团有限公司 | Concrete grout cover construction method under deep water level |
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