CN100570128C - The comprehensive high pressure jet grouting job practices of fenestrated grout stopping device - Google Patents
The comprehensive high pressure jet grouting job practices of fenestrated grout stopping device Download PDFInfo
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- CN100570128C CN100570128C CNB2007100648832A CN200710064883A CN100570128C CN 100570128 C CN100570128 C CN 100570128C CN B2007100648832 A CNB2007100648832 A CN B2007100648832A CN 200710064883 A CN200710064883 A CN 200710064883A CN 100570128 C CN100570128 C CN 100570128C
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Abstract
The comprehensive high pressure jet grouting job practices of fenestrated grout stopping device comprises: the construction face is carried out sprayed mortar handle, and adpting flange is embedded in the area face wall; Grout stopping device is installed on the upper front end of rig master drilling cramp; Rig is positioned to need the position of boring, and grout stopping device and adpting flange be connected firmly and seal tightly.The slurry tube valve that will overflow is opened, and the high pressure jet grouting drilling rod of rig is inserted to the adpting flange position, starts rig and holes; Utilize cement grout to carry out high pressure jet grouting at the bottom of the hole, the rotation limit retreats while spraying, finish design slip casting length after, stop slip casting.Close the slurry tube valve that overflows, drilling rod is retreated to outside the plate valve chamber, plate valve cuts out, again drilling rod is withdrawed from grout stopping device fully, and grout stopping device is separated with adpting flange.Worker's method of the present invention efficiently solves the problems such as pile quality, Deformation control and environment pollution that existing level churning worker method exists.
Description
Technical field
The present invention relates to be applied to various tunnels and the excavation of underground construction and the technology of advance support engineering of traffic, municipal administration, building, water conservancy and hydropower and mine engineering, is the method that a kind of comprehensive high pressure jet grouting easy to operate, quality controllable, efficient quick and economic environmental protection is constructed.
Background technology
In the tunnel and underground engineering construction of highway, railway, subway, municipal administration, water conservancy and hydropower, mine engineering, the engineering that high pressure jet grouting technique has obtained is more and more widely used.Horizontal in recent years high pressure jet grouting technique has also begun to carry out initial stage exploitation and examination is used in China, wherein the most representative be national worker's method " the pre-supporting construction of tunnel horizontal jet grouting " of finishing of CHINA RAILWAY 12TH BUREAU GROUP (YJGF11-2002).
Yet existing domestic horizontal high pressure jet grouting technique still exists problems in engineering practice, its major defect comprises:
1) in the high pressure jet grouting construction in the level and the orientation of facing upward, when the high pressure jet grouting drilling rod stops high pressure jet grouting also
When the aperture is withdrawed from, because aperture off-load and action of gravity, the cement-soil of fluidised form can outflow from the stake hole, thereby causes the injecting cement paste top space, pile quality decline to occur, the intensity and the anti-permeability performance that are reinforced the soil body are reduced, and the deflection of all unguyed soil bodys of stake increases.
2) in the high pressure jet grouting work progress, the waste pulp that refluxes in a large number outflow causes the severe environmental pollution of construction plant.
3) domestic existing level jet drill rig is simply equipped, operates inconvenience, inefficiency, pile quality and is difficult to guarantee.
In sum, domestic existing comprehensive drilling equipment and comprehensive high pressure jet grouting job practices also are in the stage that quite falls behind, and are just waiting for the arrival of substantial technological progress now.The present invention innovates generation under this technical background.
Summary of the invention
The objective of the invention is to solve the deficiency and the defective of domestic existing high pressure jet grouting technique, a kind of easy to operate, practical, quality controllable, efficiently quick, economic environmental protection is proposed, and the construct peripheral soil body and the controlled comprehensive high pressure jet grouting new construction method of surface deformable amount.This novel construction method can be widely used in tunnel and underground construction project.
Target of the present invention is achieved through the following technical solutions:
(patent No. is: " the aperture grout stopping device device of comprehensive high pressure jet grouting technique " that 2006200041746) is proposed in Chinese utility model patent to adopt the inventor, this device is made of plate valve chamber, annular seal space, positioning chamber and closed chamber, sees accompanying drawing 2 and accompanying drawing 3 for details.Utilize this aperture grout stopping device device patent, propose to solve the method for the existing constructing technology problem of being stated in the background technology.And thoroughly changed domestic existing comprehensive high pressure jet grouting construction technology.
The comprehensive high pressure jet grouting job practices of fenestrated grout stopping device of the present invention comprises following processing step:
1) face of will constructing carries out sprayed mortar and handles, and adpting flange is embedded in the area face wall of preparing to construct;
2) the aperture grout stopping device is installed on the drilling cramp front portion of comprehensive rig, the high pressure jet grouting drilling rod inserts in the annular seal space of aperture grout stopping device;
3) comprehensive rig is positioned the suitable position of front of tunnel heading, according to construction position, position, hole, adjustment has the height and the angle of the comprehensive rig master drilling cramp of aperture grout stopping device, makes rig master drilling cramp be positioned the position that need hole, and the aperture grout stopping device is connected with adpting flange by bolt;
4) with the valve open on the excessive slurry pipe of aperture grout stopping device, and the tail end of the slurry pipe that will overflow is put into the waste pulp collecting tank;
5) be inserted to the adpting flange position by aperture grout stopping device centre bore with the plate valve complete opening of aperture grout stopping device, and with the high pressure jet grouting drilling rod of comprehensive rig;
6) start comprehensive rig, adopt the mode of revolution or impact rotating, hole by design boring length;
7) when beginning to hole, be that the liquid of 0.5～1Mpa injects and is full of annular seal space from forcing pipe with pressure, sealing drum is inwardly shunk and be affixed to the high pressure jet grouting drilling rod;
8) start high pressure slurry pump, utilizing water/binder ratio is 0.5～1, pressure is that the cement grout of 20～60Mpa carries out high pressure jet grouting by the flow with 90～200L/min, at the bottom of boring good hole, rotating the limit while spraying retreats, after the high pressure jet grouting length of finishing design, stop high pressure jet grouting, in the work progress in this stage, the useless slurry overwhelming majority of the backflow that is displaced is expelled to described waste pulp collecting tank by the slurry pipe that overflows, other has minimum part waste pulp to flow to positioning chamber through plate valve chamber and annular seal space, two lip-type packings that this part useless slurry finally is sealed in the chamber are sealed in the grout stopping device of aperture fully, and under the discharge pipe unlatching situation of positioning chamber, be expelled to the appointed place from discharge pipe;
9) after boring and high pressure jet grouting working procedure are finished, close the valve on the slurry pipe that overflows, the high pressure jet grouting drilling rod is retreated to outside the plate valve chamber, and rotate first control stick and second control stick respectively, make the valve plate of plate valve overturn about 90 ° and rely on valve seat, plate valve cuts out fully, make the useless slurry that refluxes by the plate valve complete closed;
10) the high pressure jet grouting drilling rod is withdrawed from the aperture grout stopping device fully, again the grout stopping device device is removed from the later part of second partition;
11), mend slurry by carrying out pressure in the construction hole of slurry pipe in the area face wall of overflowing, to guarantee pile slurry pressure and the pile quality in this hole according to the engineering design construction requirement;
When 12) treating the high pressure jet grouting pile body, the plate valve chamber of grout stopping device is separated fully with adpting flange, simultaneously at stifled cotton-wool of the centre bore position of adpting flange plug or stopper near paste.
The comprehensive high pressure jet grouting job practices of fenestrated grout stopping device of the present invention is at described processing step 8) in can require to carry out the multiple spraying construction of one or many according to design and construction.
The comprehensive high pressure jet grouting job practices of fenestrated grout stopping device of the present invention is at described processing step 9) in close before the plate valve or at processing step 12) in the stifled cotton-wool of plug or stopper in construction drill, insert core before.
The comprehensive high pressure jet grouting job practices of fenestrated grout stopping device of the present invention, described core is reinforcing bar, tendon or steel pipe.
Compared with prior art, the present invention not only can overcome the multinomial shortcoming of existing level rotary spray technique, and described novel construction method is easy to operate, quality controllable, efficient quick and economic environmental protection.The high pressure jet grouting that the present invention implemented to finish add solid or shed have higher intensity, better in the impervious and stronger opposing overburden layer or on cover the ability of building deformation, also make comprehensive high pressure jet grouting worker method safer reliable simultaneously.
Description of drawings
The complete construction equipment figure of the comprehensive high pressure jet grouting job practices of accompanying drawing 1. fenestrated grout stopping devices;
The longitudinal section of accompanying drawing 2. aperture grout stopping devices;
The cross-sectional view of accompanying drawing 3. aperture grout stopping devices;
The rig location and the drilling rod network for location of the comprehensive high pressure jet grouting job practices of accompanying drawing 4. fenestrated grout stopping devices;
The rig drilling construction schematic diagram of the comprehensive high pressure jet grouting job practices of accompanying drawing 5. fenestrated grout stopping devices;
The high pressure jet grouting construction schematic diagram of the comprehensive high pressure jet grouting job practices of accompanying drawing 6. fenestrated grout stopping devices;
After the construction of the high pressure jet grouting of the comprehensive high pressure jet grouting job practices of accompanying drawing 7. fenestrated grout stopping devices is finished, the construction schematic diagram that the plate valve chamber and the annular seal space/positioning chamber/closed chamber of aperture grout stopping device is separated;
The comprehensive high pressure jet grouting job practices of accompanying drawing 8. fenestrated grout stopping devices is inserted the construction schematic diagram of core in boring;
Remove front end grout stopping device schematic diagram behind the comprehensive high pressure jet grouting job practices pile of accompanying drawing 9. fenestrated grout stopping devices;
The high pressure jet grouting body shed figure that the comprehensive high pressure jet grouting job practices of accompanying drawing 10. fenestrated grout stopping devices is finished.
The specific embodiment
For further setting forth the present invention, do more detailed explanation below in conjunction with embodiment.
1. the facilities and equipments of the comprehensive high pressure jet grouting technique of fenestrated grout stopping device are formed
Accompanying drawing 1 has provided the complete construction equipment of the comprehensive high pressure jet grouting worker method of fenestrated grout stopping device to be formed, and this figure shows that facilities and equipments are made up of three parts, and they are respectively the aperture grout stopping device, double-arm omnibearing hydraulic rig and backstage corollary equipment.Wherein, the backstage corollary equipment can comprise according to the needs of design and construction: cement silo 112, spiral cement conveyer (containing Weighing system) 115, one-level slurries mixer 111, secondary slurries mixer 222, three grades of slurries mixers 333, air compressor 113, high pressure slurry pump 114, delivery pump (containing flow meter), clarified water pump etc.
2. grout stopping device device in aperture constitutes
Aperture grout stopping device device with reference to the comprehensive high pressure jet grouting worker method of figure 2 and fenestrated grout stopping device shown in Figure 3, it comprises grout stopping device housing 32 and the excessive slurry pipe 3 that is installed on the grout stopping device housing 32, is provided with the break-make of the excessive slurry pipe 3 of valve 36 controls on the slurry pipe 3 that overflows.Grout stopping device housing 32 inside are divided into plate valve chamber 33, annular seal space 26, positioning chamber 15 and closed chamber 18 successively by dividing plate, and the demountable structure of the dividing plate between wherein adjacent two chambeies for being connected by bolt is so that installation and processing and maintain and replace.Each dividing plate is equipped with the centre bore of same axis, and the slurry pipe 3 that overflows communicates with wherein plate valve chamber 33.The end wall that grout stopping device housing 32 is positioned at plate valve chamber 33 1 sides is provided with an adpting flange 34 that has a centre bore, and this adpting flange 34 is embedded in the area face wall of preparing to construct 35.
In plate valve chamber 33, be provided with plate valve 31, plate valve 31 comprises flap and valve seat 7, valve seat 7 is for being fixed on the boss of first centre bore, 27 peripheries on first dividing plate 8 between plate valve chamber 33 and the annular seal space 26, flap comprises plate valve axle 4 and coupled valve plate 2, plate valve axle 4 is a hollow shaft, wherein be provided with an eccentric shaft 5, plate valve axle 4 is installed in rotation on the grout stopping device housing 32 and perpendicular to the axis of each centre bore, be tightly connected between itself and the grout stopping device housing 32, the end that plate valve axle 4 stretches out grout stopping device housing 32 links to each other with one first control stick 6.The axis of eccentric shaft 5 parallels with the axis of plate valve axle 4, and the other end that eccentric shaft 5 stretches out grout stopping device housing 32 links to each other with one second control stick 37, is tightly connected rotationally between eccentric shaft 5 and the grout stopping device housing 32.When rotating first control stick 6, when making valve plate 2 turn to position perpendicular to each centre bore axis, valve plate 2 just can cover whole valve seat 7, rotate second control stick 37 this moment, eccentric shaft 5 is turned clockwise, but eccentric shaft 5 slurcam valve shafts 4 also drive valve plate 2 to do short-range moving near the oblique below of valve seat 7, valve plate 2 are further moved, so that plate valve 31 cuts out fully to valve seat 7.When needs are opened plate valve 31, successively distinguish counter-rotation second control stick 37 and first control stick 6, valve plate 2 can be opened.
Also be provided with forcing pipe 11 on the grout stopping device housing 32, forcing pipe 11 communicates with annular seal space 26.In annular seal space 26, be provided with both ends open and the cylindrical rubber sealing drum 10 coaxial with each described centre bore, the edge of second centre bore 30 and the 3rd centre bore 24 is respectively equipped with the second centre bore boss 29 and the 3rd centre bore boss 17 in the annular seal space 26, and the edges at two ends of sealing drum 10 is fixed on respectively on the outer circumferential walls of the second centre bore boss 29 and the 3rd centre bore boss 17 hermetically.
Be respectively equipped with the 4th centre bore 25 and the 5th centre bore 19 on the 4th dividing plate 13 at positioning chamber 15 two ends and the 5th dividing plate 21, between the 4th dividing plate 13 and the 5th dividing plate 21, be provided with three axis of guides 20 that are parallel to each centre bore axis, the two ends of each axis of guide 20 are separately fixed on the 4th dividing plate 13 and the 5th dividing plate 21, and the axis of each axis of guide 20 is uniform on the face of cylinder of axis at the axis with each centre bore.Be equipped with the directive wheel 22 that can on the axis of guide 20, rotate on each axis of guide 20.Also be provided with discharge pipe 14 on grout stopping device housing 32, discharge pipe 14 communicates with positioning chamber 15.
The inwall of closed chamber 18 is provided with the lip-type packing 16 of former and later two and each centre bore same axis.
Be connected by several bolts 28 between first dividing plate 8 between plate valve chamber 33 and the annular seal space 26 and the second partition 9.
After the high pressure jet grouting construction beginning, valve 36 is opened, and carries out high pressure jet grouting, form high pressure jet grouting stake 400, the waste pulp that is displaced is most of to flow out by the slurry pipe 3 that overflows, and the sub-fraction waste pulp is through plate valve chamber 33 and annular seal space 26, and the discharge pipe 14 in positioning chamber 15 flows out.With 36 whiles of Open valve, the slurries of certain pressure are injected and are full of annular seal space 26 from forcing pipe 11, under the effect of annular seal space 26 entoplasm hydraulic couplings, sealing drum 10 is inwardly compressed and is affixed to high pressure jet grouting drilling rod 1, play the effect of sealing waste pulp, and the useless slurry amount that flows through annular seal space 26 is descended significantly.Remaining a small amount of useless slurry finally is sealed in the grout stopping device device of aperture by two lip-type packings 16 in closed chamber 18 fully.
When boring and after the high pressure jet grouting working procedure finishes, from the construction hole, withdraw from high pressure jet grouting drilling rod 1, in the time of after high pressure jet grouting drilling rod 1 retreats to plate valve 31, rotate first control stick 6 and second control stick 37 respectively, make about 90 ° and rely on valve seat 7 of valve plate 2 upset of plate valve 31, plate valve 31 cuts out fully, waste pulp is blocked in the plate valve chamber 33, be adjusted downward to zero with the slurries pressure in the annular seal space 26 this moment, mend slurry by carrying out pressure in the construction hole of slurry pipe 3 in area face wall 35 of overflowing simultaneously, to guarantee pile quality.Subsequently, high pressure jet grouting drilling rod 1 is withdrawed from from the grout stopping device of aperture fully, treat the initial set of high pressure jet grouting pile body after, pull down bolt 28, aperture grout stopping device device is removed from the later parts of second partition 9, clean immediately, check, in order to using next time.
3. the process flow of the comprehensive high pressure jet grouting job practices of fenestrated grout stopping device
Accompanying drawing 4～9 has provided the working procedure flow process of the comprehensive high pressure jet grouting worker method of fenestrated grout stopping device, mainly comprises following six master operation flow processs:
1) positioning process: will have the comprehensive rig location of aperture grout stopping device, main drilling cramp location closely links to each other pre-buried aperture adpting flange 34 in the front end in the plate valve chamber 33 of the aperture grout stopping device of main drilling cramp front end and the area face wall 35 by bolt and seals.
2) drilling operating: comprehensive rig adopts rotary drilling or the impact rotating method of creeping into to hole to projected depth.
3) high pressure jet grouting operation: comprehensive rig carries out the high pressure jet grouting construction under the cooperation of backstage auxiliary ligand complete equipment, and stops high pressure jet grouting at distance area face wall 35 about 2m places.Can repeat this works according to the design and construction requirement, carry out multiple spray.
4) separating part aperture grout stopping device operation: close the excessive slurry pipe 3 of aperture grout stopping device, high pressure jet grouting drilling rod 1 is retreated to after the plate valve 31, close the valve plate 2 of plate valve 31, plate valve chamber 33 is sealed fully.Plate valve chamber 33 annular seal space 26/ positioning chamber 15/ closed chamber 18 with back by remove bolt 28 be separated thereafter.
5) core inserts operation: carry out core according to designing requirement and implant, at first open the valve plate 2 of plate valve 31, reinforcing bar, tendon or steel pipe are inserted by plate valve chamber 33 finished in the boring of high pressure jet grouting.Close the valve plate 2 of plate valve 31, and carry out pressure by the slurry pipe 3 that overflows and mend slurry.
6) separate whole apertures grout stopping device operation: through behind the setting-up time, the plate valve chamber 33 of aperture grout stopping device is separated with area face wall 35 interior pre-buried aperture adpting flanges 34 fully by removing bolt, so far finish a high pressure jet grouting pile driving construction works.
As shown in Figure 10, when all high pressure jet grouting stakes 400 all construct finish after, can form the prop of the shed shape in whole tunnel.
4. the detailed implementing process of the comprehensive high pressure jet grouting technique of fenestrated grout stopping device
The comprehensive high pressure jet grouting job practices of fenestrated grout stopping device of the present invention comprises following processing step:
1) face of will constructing carries out sprayed mortar and handles, and adpting flange 34 is embedded in the area face wall of preparing to construct 35;
2) aperture grout stopping device 100 is installed on the drilling cramp front portion of double-arm omnibearing hydraulic rig 200, high pressure jet grouting drilling rod 1 inserts in the annular seal space 26 of aperture grout stopping device 100;
3) double-arm omnibearing hydraulic rig 200 is positioned the suitable position of front of tunnel heading, according to construction position, position, hole, adjustment has the height and the angle of the double-arm omnibearing hydraulic rig 200 main drilling cramps of aperture grout stopping device 100, make double-arm omnibearing hydraulic rig 200 main drilling cramps be positioned the position that to hole, and aperture grout stopping device 100 is connected with adpting flange 34 by bolt;
4) valve 36 on the excessive slurry pipe 3 of aperture grout stopping device 100 is opened, and the tail end of the slurry pipe 3 that will overflow is put into the waste pulp collecting tank;
5) be inserted to adpting flange 34 positions by aperture grout stopping device 100 centre bores with plate valve 31 complete openings of aperture grout stopping device 100, and with high pressure jet grouting drilling rod 1;
6) start double-arm omnibearing hydraulic rig 200, adopt the mode of revolution or impact rotating, hole by design boring length;
7) when beginning to hole, be that the liquid of 0.5～1Mpa injects and is full of annular seal space 26 from forcing pipe 11 with pressure, sealing drum 10 is inwardly shunk and be affixed to high pressure jet grouting drilling rod 1;
8) finish drilling construction after, start high pressure slurry pump, utilizing water/binder ratio is 0.5～1, pressure is the cement grout of 20～60Mpa, flow with 90～200L/min carries out high pressure jet grouting, at the bottom of boring good hole, rotating the limit while spraying retreats, after the high pressure jet grouting length of finishing design, stop high pressure jet grouting, or adopt multiple pressure spray process to carry out multiple spray, in the work progress in this stage, the useless slurry overwhelming majority of the backflow that is displaced is expelled to the waste pulp collecting tank by the slurry pipe 3 that overflows, and other has minimum part waste pulp to flow to positioning chamber 15 through plate valve chamber 33 and annular seal space 26, and two lip-type packings 16 that this part useless slurry finally is sealed in the chamber 18 are sealed in the aperture grout stopping device 100 fully, and under the discharge pipe 14 unlatching situations of positioning chamber 15, be expelled to the appointed place from discharge pipe 14;
9) after the high pressure jet grouting working procedure is finished, close the valve 36 on the slurry pipe 3 that overflows, high pressure jet grouting drilling rod 1 is retreated to outside the plate valve chamber 33, and rotate first control stick 6 and second control stick 37 respectively, plate valve 31 cuts out fully;
10) high pressure jet grouting drilling rod 1 is withdrawed from aperture grout stopping device 100 fully, and the grout stopping device device is removed from second partition 9 later parts, exist side by side to be about to remove partly and clean, check, use in order to construction next time;
11), mend slurry by carrying out pressure in the construction hole of slurry pipe 3 in area face wall 35 of overflowing, to guarantee pile pressure and the pile quality in this hole according to the engineering design construction requirement;
When 12) treating the high pressure jet grouting pile body near paste, the plate valve chamber 33 of aperture grout stopping device is separated fully with adpting flange 34, clean immediately, check simultaneously at stifled cotton-wool of the centre bore position of adpting flange 34 plug or stopper, and to plate valve chamber 33, use in order to construction next time.
The comprehensive high pressure jet grouting job practices of fenestrated grout stopping device of the present invention is at described processing step 8) in comprise according to design and construction and require to carry out multiple spraying construction.
The comprehensive high pressure jet grouting job practices of fenestrated grout stopping device of the present invention is at described processing step 9) in close before the plate valve 31 or at processing step 12) in the stifled cotton-wool of plug or stopper in construction drill, insert core before.
The comprehensive high pressure jet grouting job practices of fenestrated grout stopping device of the present invention, described core is reinforcing bar, tendon or steel pipe.
5. main design and construction parameter
1) the design and construction major parameter that adds solid as the high pressure jet grouting pile body shed and the sidewall of tunnel and underground construction advance support:
The length of pile body: 12～18m
The diameter of pile body: 0.4～1.0m
Interlock thickness between the pile body: 〉=100mm
The uniaxial compressive strength of pile body: 2～10Mpa
The transmission coefficient of pile body :≤10
-5Cm/s
Adjacent shed lap length: 〉=2m
The minimum thickness of vertical shed: 〉=30cm
2) the main construction parameter of single tube and dual pipe high pressure jet grouting worker method:
High pressure slurry pump operating pressure: 20～60Mpa
High pressure slurry pump working flow: 90～200L/min
Cement grout water/binder ratio: 0.5～1.0
6. be suitable for stratum and condition
The engineering scope of application of the present invention is broad, and its suitable stratum comprises silty clay, mucky soil, loess, admaic earth, fine sand, medium sand, coarse sand, gravel, residual clay etc.
The foregoing description is described just the detailed description of the concrete construction of the present invention, is not to concrete qualification of the present invention, so long as the similar embodiment that can reach the object of the invention and target is all within the protection domain of present patent application.
Claims (4)
1, a kind of comprehensive high pressure jet grouting job practices of fenestrated grout stopping device is characterized in that: comprise following processing step:
1) face of will constructing carries out sprayed mortar and handles, and adpting flange (34) is embedded in the area face wall of preparing to construct (35);
2) aperture grout stopping device (100) is installed on the drilling cramp front portion of comprehensive rig (200), high pressure jet grouting drilling rod (1) inserts in the annular seal space (26) of aperture grout stopping device (100);
3) comprehensive rig (200) is positioned the suitable position of front of tunnel heading, according to construction position, position, hole, adjustment has the height and the angle of the main drilling cramp of comprehensive rig (200) of aperture grout stopping device (100), make the main drilling cramp of comprehensive rig (200) be positioned the position that to hole, and aperture grout stopping device (100) is connected with adpting flange (34) by bolt;
4) valve (36) on the excessive slurry pipe (3) of aperture grout stopping device (100) is opened, and the tail end of the slurry pipe (3) that will overflow is put into the waste pulp collecting tank;
5) be inserted to adpting flange (34) position by aperture grout stopping device (100) centre bore with plate valve (31) complete opening of aperture grout stopping device (100), and with the high pressure jet grouting drilling rod (1) of comprehensive rig (200);
6) start comprehensive rig (200), adopt the mode of revolution or impact rotating, hole by design boring length;
7) when beginning to hole be that the liquid of 0.5～1Mpa injects and be full of annular seal space (26) from forcing pipe (11), sealing drum (10) is inwardly shunk and be affixed to high pressure jet grouting drilling rod (1) pressure;
8) start high pressure slurry pump, utilizing water/binder ratio is 0.5～1, pressure is that the cement grout of 20～60Mpa carries out high pressure jet grouting with the flow of 90～200L/min, at the bottom of boring good hole, rotating the limit while spraying retreats, after finishing design high pressure jet grouting length, stop high pressure jet grouting, in the work progress in this stage, the useless slurry overwhelming majority of the backflow that is displaced is expelled to described waste pulp collecting tank by the slurry pipe (3) that overflows, other has minimum part waste pulp to flow to positioning chamber (15) through plate valve chamber (33) and annular seal space (26), two lip-type packings (16) that this part useless slurry finally is sealed in the chamber (18) are sealed in the aperture grout stopping device (100) fully, and under discharge pipe (14) the unlatching situation of positioning chamber (15), be expelled to the appointed place from discharge pipe (14);
9) after boring and high pressure jet grouting working procedure are finished, close the valve (36) on the slurry pipe (3) that overflows, high pressure jet grouting drilling rod (1) is retreated to outside the plate valve chamber (33), and rotate first control stick (6) and second control stick (37) respectively, plate valve (31) cuts out fully;
10) high pressure jet grouting drilling rod (1) is withdrawed from aperture grout stopping device (100) fully, and the grout stopping device device is removed from the later part of second partition (9);
11), mend slurry by carrying out pressure in slurry pipe (3) the construction hole in area face wall (35) of overflowing, to guarantee pile slurry pressure and the pile quality in this hole according to the engineering design construction requirement;
When 12) treating the high pressure jet grouting pile body, the plate valve chamber (33) of grout stopping device is separated fully with adpting flange (34), simultaneously at stifled cotton-wool of the centre bore position of adpting flange (34) plug or stopper near paste.
2, the comprehensive high pressure jet grouting job practices of fenestrated grout stopping device according to claim 1, it is characterized in that: at described processing step 8) in, after finishing first high pressure jet grouting, can require carry out the multiple spraying construction of one or many according to design and construction.
3, the comprehensive high pressure jet grouting job practices of fenestrated grout stopping device according to claim 2 is characterized in that: at described processing step 9) in close plate valve (31) before or at processing step 12) in construction drill, insert core before the stifled cotton-wool of plug or the stopper.
4, the comprehensive high pressure jet grouting job practices of fenestrated grout stopping device according to claim 3, it is characterized in that: described core is reinforcing bar, tendon or steel pipe.
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| CN116335679B (en) * | 2023-02-16 | 2024-05-17 | 中交二航局第一工程有限公司 | Pipe curtain support and horizontal jet grouting pile combined closed loop advanced support method |
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2007
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