CN102536247B - Construction method of still-water cement grout pad - Google Patents
Construction method of still-water cement grout pad Download PDFInfo
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- CN102536247B CN102536247B CN201010616484.4A CN201010616484A CN102536247B CN 102536247 B CN102536247 B CN 102536247B CN 201010616484 A CN201010616484 A CN 201010616484A CN 102536247 B CN102536247 B CN 102536247B
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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 specifically, relate to a kind of hydrostatic cement grout cover construction method.
Background technology
At present, mining goes to deep mining by strip mining transformation gradually, and the flood of thereupon bringing is very outstanding, particularly deep shaft construction period, work plane occurs that gushing water causes that to flood the accident of well a lot, therefore, how resumes production as early as possible and becomes the important topic of vertical shaft for mine construction flooding after well accident.
Up to the present, mine is flooded takes to force water burst in quick drained pit shaft, the construct measure of grout cover water blockoff afterwards, and most grout cover is to adopt concrete grout cover.And the ponding of work plane must be drained before the construction of concrete grout cover, otherwise be difficult to successfully, meanwhile, site operation personnel will be at subaqueous work, and constructor's labour intensity is quite large, and the engineering time is quite long again, and effluent cost is quite high.So traditional method that finishes laggard row grout cover construction in draining, time-consumingly takes risks again.
Well accident is flooded in processing to be needed to carry out according to the condition particularly of growing the different geological conditions of each mines such as area as solution cavity, solution crack and fault belt.Solution cavity, solution crack are generally all communicated with each other, and are generally connected with earth's surface, if meet rainy season or surface drainage developed regions, along with the increasing of surface water, underground gushing water is also continuing to increase.If forced drainage in this case, will certainly cause somewhere surface subsidence, even cause the geological disaster of subsiding of earth's surface important building etc., so the measure of the concrete grout cover of constructing after adopting traditional draining to finish has been impracticable under this kind of condition.
Therefore, need a kind of method that can carry out grout cover construction cannot forced drainage in the situation that, to reduce the engineering time, to improve efficiency of construction, and should not forced drainage flood well accident in carry out the construction of concrete grout cover, to resume production as early as possible.
Under domestic water, grout cover technology mainly contains concrete grout cover, jackstone slip casting grout cover, coarse sand slip casting grout cover etc., but in the work progress of underwater concrete grout cover, easily there is concrete segregation, the configuration material adopting in order to prevent segregation and the variation of Transporting equipment can increase process procedure and construction cost, and prolongation is harnessed the river the duration; The construction of jackstone slip casting grout cover and coarse sand slip casting grout cover can destroy the former borehole wall of having constructed, and not only can extend the duration, also can greatly increase construction cost.
Summary of the invention
In view of the above problems, the object of this invention is to provide a kind ofly the in the situation that of not draining of vertical shaft, utilize the cost of To Construction of Silo existing equipment low, the construction method of the simple underwater cement slurry of technique grout cover.
According to an aspect of the present invention, provide a kind of hydrostatic cement grout cover construction method, having comprised:
Check, monitor by the vertical shaft water burst situation to job site, carry out the working design of the curing time of cement-slurry concentration, cement grout cover thickness, cement consumption and grout cover;
Adopt the mode installation pipeline platform of girder and auxiliary girder overlap joint at vertical shaft well head;
The plant equipment of utilizing described To Construction of Silo scene will couple together by flange, bolt and suspend in midair and transfer to vertical shaft as slipping φ 108 steel pipes of slurry pipe, and described in making, slip slurry pipe measuring table, the end opening transferred to suitable for reading near described vertical shaft shaft bottom work plane, then by described slip slurry pipe be fixed on the pipeline landing beam of well head;
Under hydrostatic state, carry out the perfusion of cement grout cover by the described slurry pipe that slips at described Water Level In Shaft, and between flush phase, according to slipping the height of slurry pipe described in the variation adjustment of cement consumption and perfusion thickness;
Utilize test bottle to test sedimentation time, time of setting and the cementing strength of cement injection slurries, to determine the curing time of cement grout cover;
Cement grout cover described in maintenance, and after the curing time of described cement grout cover finishes, carry out the construction of pit shaft draining, grouting for water blocking;
Complete in described grouting for water blocking construction, remove described cement grout cover.
Utilize above-mentioned according to hydrostatic cement grout cover construction method of the present invention, the cement paste grout cover of can constructing under water the in the situation that of not draining of vertical shaft, and can utilize To Construction of Silo existing equipment, small investment, technique is simple, speed of application is fast, water plugging effect is good.
In order to realize above-mentioned and relevant object, one or more aspects of the present invention comprise below by the feature that describes in detail and particularly point out in the claims.Explanation below and accompanying drawing describe some illustrative aspects of the present invention in detail.But, the instruction of these aspects be only 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.
Brief description of the drawings
By reference to the content below in conjunction with the description of the drawings and claims, and along with understanding more comprehensively of the present invention, other object of the present invention and result will more be understood and should be readily appreciated that.In the accompanying drawings:
Fig. 1 is hydrostatic cement grout cover construction technology schematic diagram of the present invention;
Fig. 2 shows according to the flow chart of hydrostatic cement grout cover construction technology of the present invention;
Fig. 3 shows in the present invention the embodiment schematic diagram 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.
In institute's drawings attached, identical label is indicated similar or corresponding feature or function.
Detailed description of the invention
Below with reference to accompanying drawing, specific embodiments of the invention are described in detail.
In order to describe more in detail particularly technical scheme of the present invention, by taking a concrete hydrostatic cement grout cover construction process as example, from working design, work progress, three aspects of construction results, the construction method of hydrostatic cement grout cover is described below.
Working design
Due to the seldom application in existing construction note of hydrostatic cement grout cover, substantially few of relevant data information and construction regulations can references, therefore, before construction, need first to carry out working design, the relevant construction parameter data of checking computations, comprising the curing time of cement-slurry concentration, grout cover thickness, cement consumption and grout cover etc.
Fig. 1 shows according to hydrostatic cement grout cover construction technology schematic diagram of the present invention.
In Fig. 1,1. represent stable car wire rope suspensioning Φ 108 steel pipes; 2. connect JS-750 mixer; 3. for slipping ash bucket; 4. the adpting flange for slipping between slurry pipe; 5. be hanging fixture; 6. serve as reasons to slip and starch the grouting pipeline that pipe is formed by connecting; 7. be the suspending steel wire rope of grouting pipeline; 8. be borehole wall issue; 9. be slurries snubber.In this detailed description of the invention, the pit shaft static level absolute altitude of vertical shaft is+51.6m that shaft bottom absolute altitude-43.0m, determines 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 the straight cement slurries of 1:1, after 14 days, compressive strength reaches 2.42Mpa, is far longer than the pressure of water.Therefore, can utilize the on-the-spot existing construction equipment of To Construction of Silo, adopt castinplace pile principle, ash guiding pipe end opening is transferred to shaft bottom, make cement grout utilization deadweight impact force carry out cement injection grout cover to the mode of surrounding diffusion.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, 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 the present embodiment, water/binder ratio is decided to be to 0.5:1.
Determine after the concentration of cement grout, also needed to determine according to the calculus compressive strength of determining the cement grout of concentration the thickness of the cement grout cover of needs perfusion.Known 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 set strength of cement grout is far away from rock strength, therefore, cement grout cover is not destroyed when guaranteeing to pour into, ensure perfusion effect, determine the thickness of cement grout cover according to conventional engineering analogy method in existing perfusion slurry data and working design process.According to the forming process of rock grouting rock cap, the area in the thickness of grout cover and pit shaft cross section has close relationship, the thickness of grout cover increases along with the increasing of shaft section, conventionally the thickness of the grout cover of specification vertical shaft is 6～8m, in order to strengthen safety factor, can select larger one-tenth-value thickness 1/10.In the present embodiment the thickness of hydrostatic cement grout cover is defined as to 8m.
Determine after the thickness of concentration, grout cover of cement grout, just can calculate the needed cement consumption of grouting cement grout cover in conjunction with the real size parameter of flooding well vertical shaft.
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, therefore supporting wellbore section height is not 3.1m, the radius of supporting wellbore section is not that 3.3m(is not shown), the radius of supporting wellbore section is that 2.9m(is 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, take 3.1m at supporting wellbore section not, also need to pour at supporting wellbore section the grout cover that thickness is 8-3.1=4.9m, therefore,
Supporting wellbore section volume is: Q is clean=and 3.14 × 2.9 × 2.9 × 4.9=129.4(m
3)
Cement paste water/binder ratio is pressed 0.5:1 and is calculated, and calculus rate is by 0.85, and cement calculating consumption is:
(Q hair+Q is clean) × 1200 ÷ 1000 ÷ 0.85=332.3(t)
Wherein, concerning the cement grout of 0.5:1, every side's slurries cement consumption is 1200kg, and 1000 is the kg tons of coefficients that convert, and conventionally in shaft building handbook, can find 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, finally determine that cement use amount is: 335t.
The curing time of cement grout cover can be according to the requirement of the concentration of used cement paste, key property and construction period etc. because usually determining, in this detailed description of the invention, according to the urgency of the key property of neat slurry and construction period, cement grout cover curing time is defined as to 10 days.
Then, be exactly the installation of pipe and the preparation of construction equipment have been starched in having slipped of cement injection grout cover.An important feature of the present invention is exactly to utilize current material and the equipment at To Construction of Silo scene, do not increase extra equipment expenditure, therefore, in the present embodiment, adopt on-the-spot conventional φ 108 steel pipes of To Construction of Silo for slipping slurry pipe, utilize existing hoist engine, mixer to complete to slip the slurry installation of pipe and the stirring work of cement grout, do not need to increase other equipment.
Slipping aspect slurry the selecting of pipe, with the easy plugging of thinner steel pipe, be not easy to install, remove with thicker steel pipe, must buy in addition with the steel pipe of φ 63～89, with φ 108 steel pipes can plugging for slipping that slurry pipe not only can ensure while transferring cement grout not, and as the current material of job site, can not increase extra material configuration cost, and be convenient to install.
Thereby utilizing on-the-spot tubing and plant equipment to stir, carry cement grout greatly to reduce investment outlay reduces construction cost and improves efficiency of construction.
Slipping aspect the concrete installation of slurry pipe, only need be at well head installation pipeline platform, then install and transfer a conduct of φ 108 steel pipe and slip slurry pipe.
For ensure the operation of perfusion slurry can be continuously, effectively carry out, in this specific embodiment, divide class Three's operation by job site, per tour Beater operator, put each one of grey work, maintenance mans, electrician, elevator work, technician, amount to 6 people, class Three amounts to 18 people.
Fig. 2 is according to the flow chart of hydrostatic cement grout cover construction technology of the present invention, and as shown in Figure 2, the construction process of hydrostatic cement grout cover provided by the invention is as follows:
First, measure the water surface, see that whether the water surface of pit shaft is in 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 measuring well so that determine grout cover thickness, slip slurry pipe transfer the working design parameters such as the degree of depth;
After working design completes, utilize on-the-spot construction equipment, at well head, ease of Use platform is installed, prepare for slipping the installation of slurry pipe, the perfusion of cement grout;
The making of cement grout priming line, installation;
Utilize the mixer at the To Construction of Silo scene slurries that mix cement, and carry out the perfusion of cement grout cover;
Do test experiments, to determine the curing time of cement grout cover;
Accumulative total after observation water mud liquid precipitate is thick, to determine whether to reach the perfusion requirement of cement grout cover;
Complete cement grout cover is poured in maintenance;
The color of carrying out the draining of pit shaft and observing institute's draining after curing time finishes, to determine that whether grouting is successful;
After definite grouting success, carry out grouting for water blocking;
Grouting for water blocking is complete, excavation cement grout cover, checking water plugging effect;
After determining that water blockoff success, To Construction of Silo environment are normally, recover the driving and masonry construction of vertical shaft.
Work progress
According to the construction process shown in Fig. 2, after completing working design, just can carry out construction operation as instructing taking working design, the process of construction operation mainly comprises four parts: the construction of well head installation pipeline platform, the construction of filling with grouting pipeline, perfusion, the mortar depositing construction of hydrostatic cement grout cover.
In construction operation process, first need to make well head installation pipeline platform, general employing in the mode of well head overlap joint girder and auxiliary girder set for this platform.In this detailed description of the invention, the Specific construction process of well head installation pipeline platform is: vertical shaft trapdoor is opened, the two long φ of 4 meters 28 longerons (auxiliary girder) are installed on closure plate girder, two crossbeams (auxiliary girder) are installed on longeron, girder and longeron, crossbeam and longeron are connected with bolt, at crossbeam upper berth 7cm plank as operating platform.
In another embodiment of the present invention, adopt two girders, six roots of sensation auxiliary girder to set for this platform, it builds mode as shown in Figure 3.Fig. 3 is rig, slurry filling machine operating platform schematic diagram, and in Fig. 3,1A, 1K are respectively left and right sides girder; 2,3 for being arranged on the auxiliary girder on girder 1; 4 is the adjustable segmented column leg of operating platform; 5 for implementing the boring of slip casting after grout cover has been constructed.
In the work progress of making, installing at pipeline, the diameter of what this specific embodiment adopted slip slurry pipeline is φ 108 × 4(steel pipe is 108mm, and the wall thickness of steel pipe is 4mm) steel pipe, utilizes air duct stable car to suspend in midair and transfers.Suspention is slipped and is connected with jig between the slurry wire rope of pipe and steel pipe, and between steel pipe, by flange, bolt connection, in order to ensure compactness and the soundness of connection, bolt all adopts high-strength bolt, and stiffened panel reinforcement of weld.Slip measuring table, the end opening transferred to suitable for reading of slurry pipe near vertical shaft shaft bottom work plane, slip slurry pipeline as far as possible near wellbore centre, and be fixed on wire rope on the pipeline landing beam of well head.The distance of slurry pipe end opening and shaft bottom work plane of slipping can require to determine according to the pouring construction of existing grout cover, conventionally in about 0.4～0.8m, and improve gradually the distance between end opening and shaft bottom work plane according to the thickness of poured into cement grout in work progress.
Slipping after slurry pipe transfers completely, the length of transferring steel pipe in the present embodiment is 109m through actual measurement.Manage for the ease of progressively remove the unnecessary slurry that slips during lift line, upper pipeline is installed 52 meters of long short steel pipes of joint (φ 108 manages).As cement injection slurries 70m
3after (84t cement), 1 meter of lift line, after this, enters supporting section pit shaft grout injection.Every perfusion 30m
3when (36t cement), promote 1 mitron road, to make priming line grout outlet 1 meter of buried depth (castinplace pile principle) in cement grout Rio all the time, ensure that slurries do not dilute, until 8 meters of grout covers complete.
In addition, in this specific embodiment, for by mixer with slip slurry pipe and dock, the cement grout in mixer is entered in steel pipe smoothly, also slip ash bucket slipping one of the steel pipe installation suitable for reading of slurry pipe, and be slightly less than the slurries buffer board of pipeline diameter slipping one of the steel pipe end opening welding of slurry pipe.The effect of slurries buffer board is that slurries are spread to surrounding, does not fling shaft bottom, makes the cast of grout cover even laminating, in order to avoid cause hydrostatic cement grout cover to occur zap pit.
After equipment, pipeline, cement injection slurries are all ready to, just can start the pouring construction of hydrostatic cement grout cover.Concrete work progress is as follows:
First, before perfusion, observe in detail the variation of Water Level In Shaft, no longer change at guaranteed water level, under hydrostatic state, can carry out the perfusion of cement grout cover.
In the present embodiment, the JS-750 mixer slurry that mixes cement that adopts well head to install, by slip ash-pit, slip grey movable joint by mixer with pit shaft in the mounted ash bucket that slips couple together, start continous pouring and construct.Between flush phase, need to measure at any time the perfusion degree of depth, to observe cement consumption and the variation of pouring into thickness, thereby adjust in time the height of priming line.
Simultaneously, in order to test in time sedimentation time, time of setting and the cementing strength of cement grout, in this specific embodiment, 3 tests are also arranged, test method is after the perfusion of cement grout cover finishes, first add cement grout, slowly add water again with beverage bottle, be suspended to apart from well head 80m depths with hundred meters of lining ropes, make it in environment same with cement grout cover, according to the delivery test report of cement, test bottle was proposed to well head, sedimentation time, time of setting, the cementing strength of observation cement grout respectively at 1 day, 3 days, 8 days.Then by analytical test result, determining the cement grout cover curing time that can arrange pit shaft draining, in this specific embodiment, is 10 days by the curing time of the determined cement grout cover of above-mentioned test.
After cement grout cover has been constructed and has been 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 to observe the color of institute's draining, whether also have swelling to go out to determine in pit shaft, this is also a whether aspect of generation effect of inspection grout cover.If do not have yellow muddy water to occur in drainage procedure, and water level declines rapidly, proves that cement grout cover successfully blocks shaft bottom issue, just can carry out at work plane the construction of grouting for water blocking according to the layout of pit shaft inlet well.
Fig. 4 is the embodiment schematic diagram that the design plane of inlet well in the present invention is arranged, in Fig. 4, (1) be, (2), (3), (4), (5), (6), (7), (8) inlet well numbering, from these holes, inject cement grout respectively, to block the issue of shaft bottom work plane.
Mortar depositing construction is one critical process in slip casting operation, and grouting pump must ensure a job for this reason, and one for subsequent use, necessarily requires strict control, and conscientiously operation, to guarantee grouting quality and water plugging effect.Fig. 5 is according to grouting construction process flow chart of the present invention, as shown in Figure 5, in slip casting, should complete following groundwork:
(1) stir when slurries by design proportioning, charging sequence is for discharging water, after add cement, after stirring, put into reserve pit, for preventing slurries precipitation, in midge pond, continue to stir, and regularly measure slurry specific gravity.Ensure continuously for slurry, to meet the requirement of injection rate.
(2) slurries initial concentration is selected: during slip casting, need to be first verify the injection rate of inlet well with rarer slurries slip casting, concrete injection rate determines according to boring water absorption, therefore, generally, the initial concentration of cement paste is undertaken by the proportioning of 1.5:1.
(3), before slip casting starts, reserve pit should prepare the slurries of design proportioning, and records slurries amount.Slip casting starts, and closes grouting valve, opens waster valve, starts grouting pump when letting out slurry pipe evenly when plasma discharge, closes waster valve simultaneously, opens grouting valve, and formally slip casting starts.When each shutdown, should close grouting valve, open waster valve simultaneously, and pulp-absorbing pipe is put into Rinsing Area, inhale clear water flushing pump and grouting pipeline, after pipeline-cleaning is clean, can finish this slip casting work.
(4) in slip casting process, guarantee that grouting pump runs well, start immediately stand by pump if broken down, ensure continuous grouting, and the grouting pump that maintenance is broken down in time.
(5) to every hole grouting pressure, injection rate and all abnormal phenomenas record in detail, and carry out on-the-spot shift system, after the slip casting of every hole finishes, recorded parameter should be analyzed, reference during for the slip casting of next hole.
(6) after the slip casting of every hole finishes, or stop for some reason note, answer a certain amount of clear water of pressure injection, the water yield can make to exist the slurries in feed pipe for mortar to be also pressed in hole substantially, reduces slurries waste.
(7) uninterrupted slip casting: in slip casting process, generally, slip casting should not be interrupted, and answers 24 hours continuous groutings, thereby must guarantee that reserves, transport and the slip casting personnel scene of cement relieve.
(8) intermittently slip casting: for the first time after slip casting, all shutoff of some crack, even tiny crack not yet enters slurry, must answer note and just can reach slip casting standard.Noting again the last remaining water yield that number of times requires depending on crack size, effect how many, just note and slip casting determines.Intermittently the time of slip casting is generally 24 hours, notes again mode, adopts the disposable slip casting in full hole, reaches slip casting ending standard.
(9) pretreatment slip casting: in slip casting process, too fast when pressure rise, reduce or packer permeability test and midge is rapid, unit setting-out amount is less than 0.1L/min.m.m, should carry out slip casting pretreatment, and its method is pressure injection 2m
3clear water, then pressure injection 2～3m
3300 water glass, and then pressure injection 1～2m again
3clear water, like this after pretreatment, can obviously increase the fluence of slurries.
After shaft bottom grouting completes, just can remove cement grout cover.In this specific embodiment, the cement grout cover that discloses out by observation, find to cover because grout cover upper surface has the mud of precipitation, and the cement grout top layer reason of diluting under water, Behavior of Hardened Cement Paste setting strength is more lower slightly than the intensity of expection, but do not affect pit shaft slip casting effect, prove that the construction method of hydrostatic cement grout cover of the present invention is scientific and reasonable.
In this specific embodiment, the measurement during by last dismounting cement grout cover, finds the actual (real) thickness of final grout cover of constructing and calculates slightly deviation, 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 impact of shaft bottom precipitation mud, and the calculus rate of its cement grout is:
233.1×1200÷1000÷335=0.835
Calculus rate than expection is low by 0.015.
Can find out by above-mentioned specific embodiment, the hydrostatic cement grout cover of constructing according to technology provided by the present invention has following advantage compared with concrete grout cover:
, slip slurry pipeline diameter can select φ 108 steel pipes, reduce investment outlay, and be convenient to install.While transferring slurries, can plugging, can improve efficiency of construction.
(2), cement grout only has a kind of material, while transferring, do not have segregation phenomenon.
, cement grout falls by deadweight, must not pressurize, and behind 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 according to transferring slurries amount, be easy to grasp shaft bottom mortar height.
, cement grout is owing to not emanating, the compactness that forms grout cover is better, compares concrete success rate high a lot.
Hydrostatic cement grout cover construction method of the present invention, can be the in the situation that of not draining of vertical shaft, the cement paste grout cover of directly constructing under water, not only can overcome job site can not draining, the defect of inconvenient draining is carried out the construction of grout cover in time fast, also can utilize the existing equipment at To Construction of Silo scene, small investment, technique is simple, speed of application is fast, and water plugging effect is good.
Describe according to hydrostatic cement grout cover construction method of the present invention in the mode of example above with reference to accompanying drawing.But, it will be appreciated by those skilled in the art that the hydrostatic cement grout cover construction method proposing for the invention described above, can also on the basis that does not depart from content of the present invention, make various improvement.Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (5)
1. a hydrostatic cement grout cover construction method, comprising:
Check, monitor by the vertical shaft water burst situation to job site, carry out the working design of the curing time of cement-slurry concentration, cement grout cover thickness, cement consumption and grout cover; Wherein, the situation inspection of described vertical shaft water burst is comprised and measures the water surface and measure bottom depth; Whether the described measurement water surface is for observing the water surface of pit shaft in hydrostatic state; Described mensuration bottom depth is for determining working design parameter;
Adopt the mode installation pipeline platform of girder and auxiliary girder overlap joint at vertical shaft well head; Vertical shaft trapdoor is opened, the two long φ of 4 meters 28 longerons are installed on closure plate girder, two crossbeams are installed on longeron, girder and longeron, crossbeam and longeron are connected with bolt, on crossbeam, boarding is as operating platform;
The plant equipment of utilizing described To Construction of Silo scene will couple together by flange, bolt and suspend in midair and transfer to vertical shaft as slipping φ 108 steel pipes of slurry pipe, wherein, adopts high-strength bolt to slip the flange at slurry pipe two ends and stiffened panel reinforcement of weld described in connecting;
And described in making, slip slurry pipe measuring table, the end opening transferred to suitable for reading near described vertical shaft shaft bottom work plane, then by described slip slurry pipe be fixed on the pipeline landing beam of well head; Wherein, utilize air duct stable car to slip the suspention of slurry pipe described in carrying out and transfer, slip described in suspention and be connected with jig between the wire rope of slurry pipe and steel pipe;
Before perfusion, the variation of observation Water Level In Shaft, under hydrostatic state, carries out the perfusion of cement grout cover by the described slurry pipe that slips at described Water Level In Shaft, and between flush phase, according to slipping the height of slurry pipe described in the variation adjustment of cement consumption and perfusion thickness; Described in promoting gradually according to the thickness of poured into cement grout, slip slurry pipe, to slip slurry pipe grout outlet 1 meter of buried depth in cement grout all the time described in making, and during lift line, progressively remove the unnecessary slurry pipe that slips from the described top that slips slurry pipe;
Utilize test bottle to test sedimentation time, time of setting and the cementing strength of cement injection slurries, to determine the curing time of cement grout cover; Or, determine the curing time of described grout cover according to the requirement of described cement-slurry concentration, cement key property and construction period;
Cement grout cover described in maintenance, and after the curing time of described cement grout cover finishes, carry out the construction of pit shaft draining, grouting for water blocking;
Complete in described grouting for water blocking construction, remove described cement grout cover.
2. hydrostatic cement grout cover construction method as claimed in claim 1, wherein,
Described cement-slurry concentration is water/binder ratio 0.5:1～1:1;
The thickness of described cement grout cover is 6～8m.
3. hydrostatic cement grout cover construction method as claimed in claim 1, wherein,
The described upper pipeline that slips slurry pipe is φ 108 steel pipes of connected 2 meters long of 5 joints.
4. hydrostatic cement grout cover construction method as claimed in claim 1, wherein,
Slip ash bucket in described installation suitable for reading of slipping slurry pipe, and be less than the slurries buffer board of pipeline diameter in described one of end opening welding of slipping slurry pipe.
5. hydrostatic cement grout cover construction method as claimed in claim 4, wherein, adopts the mixer at the described To Construction of Silo scene slurries that mix cement, and by described mixer grout outlet by slip ash-pit, slip grey movable joint with described in slip ash bucket and be connected.
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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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| CN102536247A (en) | 2012-07-04 |
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