CN105221157A - WSS grouting and reinforcing assist gas pressure cutter replacing method in shield tunnel - Google Patents

WSS grouting and reinforcing assist gas pressure cutter replacing method in shield tunnel Download PDF

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Publication number
CN105221157A
CN105221157A CN201510608240.4A CN201510608240A CN105221157A CN 105221157 A CN105221157 A CN 105221157A CN 201510608240 A CN201510608240 A CN 201510608240A CN 105221157 A CN105221157 A CN 105221157A
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shield
slip casting
grouting
reinforcing
hole
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CN105221157B (en
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许建飞
杨永强
张登云
田黎明
张伟
张大洋
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China Railway First Engineering Group Co Ltd
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China Railway First Engineering Group Co Ltd
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Abstract

The invention discloses WSS grouting and reinforcing assist gas pressure cutter replacing method in a kind of shield tunnel, comprise step: one, soil stabilization before tool changing, process is as follows: 101, slip casting putting up platform: in the shield body of shield machine, set up slip casting platform, slip casting platform is arranged in shield; 102, driller insertion: rig is installed on slip casting platform; 103, boring and slip casting: the multiple injected holes in the soil body of shield external side are holed and slip casting respectively; Multiple injected hole is multiple radial holes by middle shield is arranged by the boring of creeping in the soil body of the external side of described shield before backward; Angle between injected hole and shield body central axis is 11 ° ~ 12.5 °; Two, tool changing: after institute's injection slurry all solidifies in step 1034, changes the cutter on cutterhead.The inventive method step is simple, reasonable in design, easy and simple to handle and safety factor is high, result of use is good, effectively can solve shield machine tool changing difficult problem when ground does not reinforce space.

Description

WSS grouting and reinforcing assist gas pressure cutter replacing method in shield tunnel
Technical field
The invention belongs to tunneling shield technical field of construction, especially relate to WSS grouting and reinforcing assist gas pressure cutter replacing method in a kind of shield tunnel.
Background technology
Shield method is the Fully-mechanized construction method of one of modern constructing tunnel, and its plant equipment mainly used is shield machine, is divided into earth pressure balanced shield, EPBS and slurry balance shield two type, wherein uses more with earth pressure balanced shield, EPBS.Shield machine carries out earth cutting and catalase by cutter in tunnel excavating process, and after shield machine long distance driving, especially when ground consisting of hard rock or hard-soft heterogeneous ground shield-tunneling construction, cutter inevitably produces eccentric wear and damages ring, if carry out the replacing of cutter not in time and continue driving, light then normal drivage efficiency cannot be ensured, heavy then can make shield machine cannot tunneling construction, even affect the life-span of shield machine.Therefore, shield machine tool changing of carrying out opening a position in work progress is necessary work.
The method of conventional gas tool changing has following two kinds: conventional air pressure tool changing and the tool changing of ground pretreatment air pressure.Wherein, conventional air pressure tool changing is the air compressor machine and auxiliary gas booster that utilize shield structure to carry, adds air pressure, the water in native storehouse, soil air are replaced the soil body, replace original Water And Earth Pressures with air pressure, set up the balance of native storehouse internal gas pressure and Water And Earth Pressures out of my cabin; Then, personnel enter in native storehouse and carry out operation.The condition of conventional air pressure tool changing is that soil body sealing is air tight, and the method cannot be carried out in loose earth.
Tool changing place is determined in the tool changing of ground pretreatment air pressure in advance, adopts the measure of the soil stabilization such as three axes agitating pile, rotary churning pile to reinforce the soil body in advance on ground in advance, strengthens the self-stability of the soil body; Then, after cutter head of shield machine enters stabilization zone, carry out normal pressure and to open a position tool changing.Pretreatment normal pressure tool changing construction technology is simple, and the duration is short, and consolidation effect is good, but high to ground site requirements, expropriation of land and reparation difficulty.In broken rock, broken ground or when shield-tunneling construction is carried out in the poor location of other geological conditions, the most frequently used at present method of tool changing soil stabilization is reinforced respectively cutterhead stratum all around by ground, reaches the tool changing that can to open a position after reinforcing object.And some surface state is complicated, pipeline is more or due to construction of structures impact, ground does not reinforce space, and in order to complete the replacing of cutter, difficulty is very large.
WSS two fluid grouting (hereinafter referred to as WSS slip casting) technique functions comes from Japan, and in Taiwan, Application comparison is extensive.WSS is the Pinyin abbreviation of Chinese ungauged regions two fluid grouting.WSS slurry injection technique, after adopting double pipe drill hole of drilling machine to desired depth, adopts the slip casting of a synchronous grouting machine.Slurries have two kinds, i.e. A liquid and B liquid or A liquid and C liquid, and two kinds of slurries are fully mixed by the slurry mixer of double pipe termination.Adopt electronic monitoring means to implement directed, quantitative, level pressure slip casting during slip casting, make be full of slurries between the space of rock-soil layer or hole and solidify, to reach the object changing rock-soil layer proterties.Thus, need design that a kind of method step is simple, reasonable in design, easy and simple to handle and WSS grouting and reinforcing assist gas pressure cutter replacing method in the shield tunnel that safety factor is high, result of use is good, effectively can solve shield machine tool changing difficult problem when ground does not reinforce space.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, WSS grouting and reinforcing assist gas pressure cutter replacing method in a kind of shield tunnel is provided, its method step is simple, reasonable in design, easy and simple to handle and safety factor is high, result of use is good, effectively can solve shield machine tool changing difficult problem when ground does not reinforce space.
For solving the problems of the technologies described above, the technical solution used in the present invention is: WSS grouting and reinforcing assist gas pressure cutter replacing method in a kind of shield tunnel, is characterized in that the method comprises the following steps:
Soil stabilization before step one, tool changing, process is as follows:
Step 101, slip casting putting up platform: in the shield body of shield machine, set up slip casting platform, described shield body is assembled from front to back by anterior shield, middle shield and shield tail, and described slip casting platform is arranged in described shield; Described anterior shield front portion is provided with cutterhead;
Step 102, driller insertion: rig is installed on the platform of slip casting described in step one;
Step 103, boring and slip casting: the multiple injected holes in the soil body of described shield external side are holed and slip casting respectively;
Multiple described injected hole is that the multiple radial holes by described middle shield is arranged creep into the boring formed before backward in the soil body of the external side of described shield; Multiple described radial hole is along the circumferential direction laid in the middle and upper part of described middle shield and it is all arranged on the same cross section of described shield; Multiple described injected hole is inclined upwardly gradually before backward, and the angle between multiple described injected hole and described shield body central axis is A, wherein A=11 ° ~ 12.5 °; The front end of multiple described injected hole is all positioned at described cutterhead front, and the spacing between the front end of each described injected hole and described cutterhead is 1.5m ~ 2.5m;
Boring and the grouting method of multiple described injected hole are all identical; Injected hole described in any one is holed and slip casting time, comprise the following steps:
Step 1031, small punching: adopt described rig to stop boring after creeping into 1.5m ~ 2.5m before backward, obtain rear portion boring;
Step 1032, sealing of hole: inject hole sealing agent, carry out sealing of hole to the boring of rear portion described in step 1031;
Step 1033, follow-up boring: after sealing of hole completes, adopt described rig to continue to creep into before backward, until complete the boring procedure of injected hole;
Step 1034, slip casting: adopt WSS slip casting method and by injected hole described in step 1033, grouting and reinforcing carried out to the soil body of the external side of described shield;
In step 1031 in small punching, step 1032 in sealing of hole and step 1033 in follow-up boring procedure, the native storehouse internal pressure of shield machine is monitored in real time, and the internal pressure of described Tu Cang is controlled between 1.5bar ~ 2.0bar; In step 1034 in slip casting process, the internal pressure of described Tu Cang is monitored in real time; When the internal pressure of described Tu Cang is greater than P, stop slip casting; When the internal pressure of described Tu Cang drops between 1.5bar ~ 2.0bar, then continue slip casting; Wherein, P=2.5bar ~ 2.8bar;
Step 2, tool changing: after in step 1034, institute's injection slurry all solidifies, the cutter on described cutterhead is changed.
In above-mentioned shield tunnel, WSS grouting and reinforcing assist gas pressure cutter replacing method, is characterized in that: in step 1034 in slip casting process, rotates once described cutterhead every 50min ~ 70min.
In above-mentioned shield tunnel, WSS grouting and reinforcing assist gas pressure cutter replacing method, is characterized in that: in step 1034 before slip casting, first adopts grouting equipment in described native storehouse, to inject cement mortar or bentonite slurry, until fill up described Tu Cang;
Further, inject cement mortar or bentonite slurry process, the internal pressure of described Tu Cang is monitored in real time, and the internal pressure of described Tu Cang is controlled between 1.5bar ~ 2.0bar.
In above-mentioned shield tunnel, WSS grouting and reinforcing assist gas pressure cutter replacing method, is characterized in that: the A=11.8 ° described in step 103; The identical length of multiple described injected hole is same, and the length of multiple described injected hole is 7.5m ~ 8.5m.
WSS grouting and reinforcing assist gas pressure cutter replacing method in above-mentioned shield tunnel, is characterized in that: before carrying out slip casting in step 1034, settlement observation point is all laid in the ground above described shield machine and within the scope of 10 meters, front and back; In step 1034 in slip casting process, the settlement observation point laid is utilized to observe surface settlement situation.
WSS grouting and reinforcing assist gas pressure cutter replacing method in above-mentioned shield tunnel, it is characterized in that: in step 103, the multiple injected holes in the soil body of described shield external side are holed respectively and slip casting time, from front to back multiple injected hole is holed and slip casting respectively along clockwise direction or in the counterclockwise direction.
WSS grouting and reinforcing assist gas pressure cutter replacing method in above-mentioned shield tunnel, it is characterized in that: the platform of slip casting described in step 101 comprises bracing frame and is laid in the flat board on support frame as described above, shown bracing frame is scaffold, and the height of described scaffold is 4m ~ 4.5m and its width is 2.8m ~ 4.5m.
WSS grouting and reinforcing assist gas pressure cutter replacing method in above-mentioned shield tunnel, is characterized in that: the quantity of injected hole described in step 103 is four; The quantity of described radial hole is four, four described radial holes comprise left radial hole on two left side walls being arranged in described shield and two right radial holes be arranged on the right side wall of described shield, and two described left radial holes and two described right radial holes are symmetrically laid.
WSS grouting and reinforcing assist gas pressure cutter replacing method in above-mentioned shield tunnel, is characterized in that: when carrying out tool changing in step 2, adopts normal pressure tool changing method, changes the cutter on described cutterhead.
WSS grouting and reinforcing assist gas pressure cutter replacing method in above-mentioned shield tunnel, is characterized in that: when carrying out slip casting in step 1034, and adopt retrusive slip casting method to carry out slip casting, grouting pressure is 0.2MPa ~ 0.3MPa.
The present invention compared with prior art has the following advantages:
1, easy construction and cutter replacing method step are simple, and it is convenient to realize.
2, reasonable in design, actual exchanging knives process mainly comprises soil stabilization and tool changing two steps before tool changing, wherein before tool changing, soil stabilization comprises slip casting putting up platform, driller insertion and boring and slip casting three steps, utilize the slip casting platform set up in middle shield and undertaken holing and slip casting by multiple radial holes that middle shield is offered, to carry out grouting and reinforcing to the soil body above cutterhead and the front of tunnel heading soil body, cost of investment is low and realization is convenient, and can the soil body effectively directly over the cutterhead of reinforcing shield machine and otch ring, to strengthen the stability of the soil body above cutterhead.
3, the injected hole result of use of drilling via formations is good, angle between injected hole and shield body central axis is 11 ° ~ 12.5 °, the front end of the injected hole spacing all in cutterhead front and between injected hole front end and cutterhead is 1.5m ~ 2.5m, by multiple injected holes of drilling via formations can to the shield external side soil body carry out easy, effectively reinforce, and soil stabilization is good.
4, the boring procedure of injected hole reasonable in design and realize convenient, result of use is good, boring procedure safety, reliable, actual when holing, first adopt rig to stop boring after creeping into 1.5m ~ 2.5m before backward, obtain rear portion boring; Reinject hole sealing agent, carries out sealing of hole to rear portion boring, so as not to carry out below holing and slip casting time, the muddy water that shield is external and slurries flow in shield machine; After sealing of hole completes, rig is adopted to continue to creep into before backward, until complete the boring procedure of injected hole.
5, slip casting adopts conventional WSS slip casting method, easy and simple to handle, realize convenient and slip casting effect is good, by carrying out WSS slip casting to the front of tunnel heading soil body, reinforcing the front of tunnel heading soil body, being convenient to the foundation of native storehouse internal gas pressure, ensure carrying out smoothly of air pressure tool changing.
6, tool changing efficiency is high and do not affect the construction period, and safety factor in exchanging knives process is very high, effectively can ensure that tool changing work progress carries out fast, effectively.
7, practical value is high and result of use good; adopt WSS grouting and reinforcing assist gas pressure tool changing mode in tunnel; can effectively solve ground do not possess grouting and reinforcing condition and cutterhead position features as poor geologic condition does not possess air pressure tool changing when tool changing a difficult problem; strengthen the safety of shield machine shutdown inspection, tool changing; reduce downtime; improve shield driving efficiency, have good Social and economic benef@.
The application conditions of conventional gas tool changing operation technique is the broken scall that closely knit air tight or ground, stratum possesses stratum consolidation condition, for broken scall and ground have building do not possess ground reinforce condition time, adopt the present invention to carry out tool changing can effectively ensure to calm the anger smooth, the safety of operation to carry out, expand the scope of application of operation of calming the anger, can be widely used in subway work afterwards; And without the need to any precondition when the present invention carries out tool changing, thus solve existing shield structure tool changing mode and change a difficult problem without shield machine cutter during corresponding tool changing condition.
8, widely applicable, can effectively be suitable in all constructions of the shield machine tool changing based on earth pressure balance.
In sum, the inventive method step is simple, reasonable in design, easy and simple to handle and safety factor is high, result of use is good, effectively can solve shield machine tool changing difficult problem when ground does not reinforce space.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is method flow block diagram of the present invention.
Fig. 2 is Construction State figure of the present invention.
Fig. 3 is the installation position figure of injected hole of the present invention.
Description of reference numerals:
1-shield machine; 2-injected hole; 3-radial hole;
4-scaffold; 5-walkway board; 6-soil stabilization.
Detailed description of the invention
WSS grouting and reinforcing assist gas pressure cutter replacing method in a kind of shield tunnel as shown in Figure 1, comprises the following steps:
Soil stabilization before step one, tool changing, process is as follows:
Step 101, slip casting putting up platform: as shown in Figure 2, set up slip casting platform in the shield body of shield machine 1, and described shield body is assembled from front to back by anterior shield, middle shield and shield tail, and described slip casting platform is arranged in described shield; Described anterior shield front portion is provided with cutterhead;
Step 102, driller insertion: rig is installed on the platform of slip casting described in step one;
Step 103, boring and slip casting: the multiple injected holes 2 in the soil body of described shield external side are holed and slip casting respectively;
Composition graphs 3, multiple described injected hole 2 is that the multiple radial holes 3 by described middle shield is arranged creep into the boring formed before backward in the soil body of the external side of described shield; Multiple described radial hole 3 is along the circumferential direction laid in the middle and upper part of described middle shield and it is all arranged on the same cross section of described shield; Multiple described injected hole 2 is inclined upwardly gradually before backward, and the angle between multiple described injected hole 2 and described shield body central axis is A, wherein A=11 ° ~ 12.5 °; The front end of multiple described injected hole 2 is all positioned at described cutterhead front, and the spacing between the front end of each described injected hole 2 and described cutterhead is 1.5m ~ 2.5m;
Boring and the grouting method of multiple described injected hole 2 are all identical; Injected hole described in any one 2 is holed and slip casting time, comprise the following steps:
Step 1031, small punching: adopt described rig to stop boring after creeping into 1.5m ~ 2.5m before backward, obtain rear portion boring;
Step 1032, sealing of hole: inject hole sealing agent, carry out sealing of hole to the boring of rear portion described in step 1031;
Step 1033, follow-up boring: after sealing of hole completes, adopt described rig to continue to creep into before backward, until complete the boring procedure of injected hole 2;
Step 1034, slip casting: adopt WSS slip casting method and by injected hole 2 described in step 1033, grouting and reinforcing carried out to the soil body of the external side of described shield;
In step 1031 in small punching, step 1032 in sealing of hole and step 1033 in follow-up boring procedure, the native storehouse internal pressure of shield machine 1 is monitored in real time, and the internal pressure of described Tu Cang is controlled between 1.5bar ~ 2.0bar; In step 1034 in slip casting process, the internal pressure of described Tu Cang is monitored in real time; When the internal pressure of described Tu Cang is greater than P, stop slip casting; When the internal pressure of described Tu Cang drops between 1.5bar ~ 2.0bar, then continue slip casting; Wherein, P=2.5bar ~ 2.8bar;
Step 2, tool changing: after in step 1034, institute's injection slurry all solidifies, the cutter on described cutterhead is changed.
In the present embodiment, in step 103, residing for multiple described injected hole 2, region is soil stabilization district 6.
During practice of construction, in step 1034 in slip casting process, rotate once described cutterhead every 50min ~ 70min.
In the present embodiment, in step 1034 in slip casting process, rotate once described cutterhead every 1h.In actual mechanical process, can according to specific needs, the time interval of rotating described cutterhead be adjusted accordingly.
Admittedly live cutterhead for slurries when avoiding slip casting in step 103 flow in described native storehouse, in step 1034 before slip casting, first adopt grouting equipment in described native storehouse, to inject cement mortar or bentonite slurry, until fill up described Tu Cang;
Further, inject cement mortar or bentonite slurry process, the internal pressure of described Tu Cang is monitored in real time, and the internal pressure of described Tu Cang is controlled between 1.5bar ~ 2.0bar.
In the present embodiment, grouting equipment is adopted to inject bentonite slurry in described native storehouse.
During practice of construction, grouting equipment also can be adopted in described native storehouse to inject cement mortar.
And, when adopting grouting equipment to inject cement mortar or bentonite slurry in described native storehouse, adopt the screw conveyor machine of shield machine 1 and the grouting equipment of synchronousing working with described screw conveyor machine to carry out Tu Cang to replace and fill, described screw conveyor machine is arranged on the native storehouse lower sidewall in shield machine 1, and on the sidewall of described Tu Cang, correspondence is provided with the soil outlet and grouting port installed for described screw conveyor machine and described grouting equipment; And when carrying out Tu Cang displacement filling, discharged in native storehouse gradually from the bottom to top by all earth of described screw conveyor machine by inside, native storehouse, and at earth from the bottom to top gradually from discharge process in native storehouse, by described grouting equipment is synchronous from top to bottom, the native storehouse internal cavities after earth discharge is filled, until all earth in native storehouse are all replaced with cement mortar or bentonite slurry, then complete the Tu Cang earth in native storehouse all being replaced with cement mortar or bentonite slurry from top to bottom and replace filling process.
In the present embodiment, the A=11.8 ° described in step 103.
The identical length of multiple described injected hole 2 is same, and the length of multiple described injected hole 2 is 7.5m ~ 8.5m.In the present embodiment, the length of multiple described injected hole 2 is 8m.
In the present embodiment, step 1031 adopts described rig to stop boring after creeping into 2m before backward, i.e. the length L1=2m of described rear portion boring.Correspondingly, the length L2=6m of the front-side holes section of boring front side, described rear portion is positioned in described injected hole 2.
During practice of construction, can according to specific needs, the value size of A, L1 and L2 be adjusted accordingly respectively.
In the present embodiment, in step 103, the multiple injected holes 2 in the soil body of described shield external side are holed respectively and slip casting time, from front to back multiple injected hole 2 is holed and slip casting respectively along clockwise direction or in the counterclockwise direction.
During practice of construction, the platform of slip casting described in step 101 comprises bracing frame and is laid in the flat board on support frame as described above, and shown bracing frame is scaffold 4, and the height of described scaffold 4 is 4m ~ 4.5m and its width is 2.8m ~ 4.5m.
In the present embodiment, the height of described scaffold 4 is 4.3m and its width is 3m.
In the present embodiment, described flat board is walkway board 5, adopts iron wire to be fixed between described walkway board 5 and scaffold 4.
In the present embodiment, before carrying out slip casting in step 1034, settlement observation point is all laid in the ground above described shield machine and within the scope of 10 meters, front and back; In step 1034 in slip casting process, the settlement observation point laid is utilized to observe surface settlement situation.
Thus, after described settlement observation point has been laid, first record is carried out to the initial settlement value at each settlement observation point installation position place; Hole in step 103 and in slip casting process, within every 2 hours, monitor a sedimentation, and synchronous recording is carried out to monitoring result.
In the present embodiment, P=2.5bar.In practice of construction process, can according to specific needs, the value size of P be adjusted accordingly.Thus, when carrying out slip casting in step 1034, after described native storehouse internal pressure reaches 2.5bar, stop slip casting, be down to after between 1.5bar ~ 2.0bar until described native storehouse internal pressure and proceed slip casting again, until reinforced.
In the present embodiment, the quantity of injected hole 2 described in step 103 is four; The quantity of described radial hole 3 is four, four described radial holes 3 comprise left radial hole on two left side walls being arranged in described shield and two right radial holes be arranged on the right side wall of described shield, and two described left radial holes and two described right radial holes are symmetrically laid.
The shield body of described shield machine 1 and shield shell, on the middle shield of described shield machine 1, the quantity of set radial hole 3 is 8.Carry out in the present invention holing and slip casting, select 4 the described radial holes 3 being laid in described middle shield middle and upper part, refer to Fig. 2.Further, described radial hole 3 is the advance geologic inspecting hole that described middle shield is arranged.
In step 1031 during small punching, first the flange of shutoff on described radial hole 3 is dismantled, more radially hole 3 to shield external boring 2m; Then, stop boring, start to inject described hole sealing agent and carry out sealing of hole, so as not to carry out below holing and slip casting time, the muddy water that shield is external and slurries flow in shield machine 1; After sealing of hole, and then creep into, drilling depth length overall length is 8m, and cutterhead front is about 2m, stops afterwards creeping into, starts slip casting.
In the present embodiment, when carrying out slip casting in step 1034, adopt retrusive slip casting method to carry out slip casting, grouting pressure is 0.2MPa ~ 0.3MPa.
Thus, when carrying out slip casting in step 1034, to control grouting pressure, a point multiple sections carries out slip casting from front to back, and grouting pressure is 0.2MPa ~ 0.3MPa; After grouting pressure reaches 0.3MPa, retreat, then carry out the slip casting of next sections, till having noted.
In the present embodiment, rig described in step 102 is ZJY-250 type rig.
Further, when carrying out slip casting in step 1034, the drilling rod of described ZJY-250 type rig is Grouting Pipe.
In practice of construction process, after described slip casting putting up platform completes, the direction adopting jack to be lifted on by the filling system that WSS slip casting method adopts described slip casting platform to adjust described rig again and creep into, the preparation before carrying out boring.
In the present embodiment, described ZJY-250 type rig freely can adjust bore angle, and drilling rod itself can use as Grouting Pipe, and can be used for the dual slurry injecting the employing of WSS slip casting method.
When adopting the soil body of WSS slip casting method to the external side of described shield to carry out grouting and reinforcing in step 1034, the grouting method adopted is the conventional grouting method of WSS slip casting, and the dual slurry injected is the conventional slurries of WSS slip casting.In the present embodiment, inject dual slurry and be that A liquid and B liquid Homogeneous phase mixing form and its proportion is 1.3 ~ 1.5, wherein A liquid is cement paste, and the cement paste adopted is Portland cement, and cement grade is No. 425; B liquid is water glass, and the Baume degrees of water glass is 40 ° of B é, the initial setting time is 2min ~ 3min and the set strength of its 2h is 3MPa ~ 4MPa.
During practice of construction, the dual slurry injected also can be the conventional slurries of other WSS slip casting.
In the present embodiment, hole sealing agent described in step 1032 is phosphoric acid.
During practice of construction, also can adopt the hole sealing agent of other type.
In the present embodiment, when carrying out tool changing in step 2, adopt normal pressure tool changing method, the cutter on described cutterhead is changed.Often change one cutter, gauze need be adopted to carry out shutoff to the space changing side of rear cutter week.
And, when cutter on described cutterhead is changed, employing is beaten boring tool and is carried out labor cleaning to the cement bonded sand lumps be set in native storehouse or to the bentonite slurry injected in described native storehouse, and in cement bonded sand lumps scale removal process, synchronously the cutter be arranged on described cutterhead is changed one by one.
Wherein, in cement bonded sand lumps scale removal process, while cut the cement bonded sand lumps be set in native storehouse, while change the cutter dug out, and often dig out a cutter, immediately this dug out cutter is changed, until by shield machine 1 needs change all cutters all changed till, then complete the exchanging knives process of shield machine 1.
After tool changing completes, conveniently shield machine is got rid of poverty method, gets rid of poverty to shield machine 1; And after shield machine 1 gets rid of poverty, first adopt supercharging equipment to set up air pressure in native storehouse, and make added air pressure native storehouse in can support the soil body of face, afterwards conveniently shield machine propulsion method, the shield machine 1 after pressurizeing in native storehouse is advanced.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.

Claims (10)

1. a WSS grouting and reinforcing assist gas pressure cutter replacing method in shield tunnel, is characterized in that the method comprises the following steps:
Soil stabilization before step one, tool changing, process is as follows:
Step 101, slip casting putting up platform: in the shield body of shield machine (1), set up slip casting platform, described shield body is assembled from front to back by anterior shield, middle shield and shield tail, and described slip casting platform is arranged in described shield; Described anterior shield front portion is provided with cutterhead;
Step 102, driller insertion: rig is installed on the platform of slip casting described in step one;
Step 103, boring and slip casting: the multiple injected holes (2) in the soil body of described shield external side are holed and slip casting respectively;
Multiple described injected hole (2) is that the multiple radial holes (3) by described middle shield is arranged creep into the boring formed before backward in the soil body of the external side of described shield; Multiple described radial hole (3) is along the circumferential direction laid in the middle and upper part of described middle shield and it is all arranged on the same cross section of described shield; Multiple described injected hole (2) is inclined upwardly gradually before backward, and the angle between multiple described injected hole (2) and described shield body central axis is A, wherein A=11 ° ~ 12.5 °; The front end of multiple described injected hole (2) is all positioned at described cutterhead front, and the spacing between the front end of each described injected hole (2) and described cutterhead is 1.5m ~ 2.5m;
Boring and the grouting method of multiple described injected hole (2) are all identical; Injected hole described in any one (2) is holed and slip casting time, comprise the following steps:
Step 1031, small punching: adopt described rig to stop boring after creeping into 1.5m ~ 2.5m before backward, obtain rear portion boring;
Step 1032, sealing of hole: inject hole sealing agent, carry out sealing of hole to the boring of rear portion described in step 1031;
Step 1033, follow-up boring: after sealing of hole completes, adopt described rig to continue to creep into before backward, until complete the boring procedure of injected hole (2);
Step 1034, slip casting: adopt WSS slip casting method and by injected hole (2) described in step 1033, grouting and reinforcing carried out to the soil body of the external side of described shield;
In step 1031 in small punching, step 1032 in sealing of hole and step 1033 in follow-up boring procedure, the native storehouse internal pressure of shield machine (1) is monitored in real time, and the internal pressure of described Tu Cang is controlled between 1.5bar ~ 2.0bar; In step 1034 in slip casting process, the internal pressure of described Tu Cang is monitored in real time; When the internal pressure of described Tu Cang is greater than P, stop slip casting; When the internal pressure of described Tu Cang drops between 1.5bar ~ 2.0bar, then continue slip casting; Wherein, P=2.5bar ~ 2.8bar;
Step 2, tool changing: after in step 1034, institute's injection slurry all solidifies, the cutter on described cutterhead is changed.
2. according to WSS grouting and reinforcing assist gas pressure cutter replacing method in shield tunnel according to claim 1, it is characterized in that: in step 1034 in slip casting process, rotate once described cutterhead every 50min ~ 70min.
3. according to WSS grouting and reinforcing assist gas pressure cutter replacing method in the shield tunnel described in claim 1 or 2, it is characterized in that: in step 1034 before slip casting, grouting equipment is first adopted in described native storehouse, to inject cement mortar or bentonite slurry, until fill up described Tu Cang;
Further, inject cement mortar or bentonite slurry process, the internal pressure of described Tu Cang is monitored in real time, and the internal pressure of described Tu Cang is controlled between 1.5bar ~ 2.0bar.
4., according to WSS grouting and reinforcing assist gas pressure cutter replacing method in the shield tunnel described in claim 1 or 2, it is characterized in that: the A=11.8 ° described in step 103; The identical length of multiple described injected hole (2) is same, and the length of multiple described injected hole (2) is 7.5m ~ 8.5m.
5., according to WSS grouting and reinforcing assist gas pressure cutter replacing method in the shield tunnel described in claim 1 or 2, it is characterized in that: before carrying out slip casting in step 1034, settlement observation point is all laid in the ground above described shield machine and within the scope of 10 meters, front and back; In step 1034 in slip casting process, the settlement observation point laid is utilized to observe surface settlement situation.
6. according to WSS grouting and reinforcing assist gas pressure cutter replacing method in the shield tunnel described in claim 1 or 2, it is characterized in that: in step 103, the multiple injected holes (2) in the soil body of described shield external side are holed respectively and slip casting time, from front to back multiple injected hole (2) is holed and slip casting respectively along clockwise direction or in the counterclockwise direction.
7. according to WSS grouting and reinforcing assist gas pressure cutter replacing method in the shield tunnel described in claim 1 or 2, it is characterized in that: the platform of slip casting described in step 101 comprises bracing frame and is laid in the flat board on support frame as described above, shown bracing frame is scaffold (4), and the height of described scaffold (4) is 4m ~ 4.5m and its width is 2.8m ~ 4.5m.
8. according to WSS grouting and reinforcing assist gas pressure cutter replacing method in the shield tunnel described in claim 1 or 2, it is characterized in that: the quantity of injected hole described in step 103 (2) is four; The quantity of described radial hole (3) is four, four described radial holes (3) comprise left radial hole on two left side walls being arranged in described shield and two right radial holes be arranged on the right side wall of described shield, and two described left radial holes and two described right radial holes are symmetrically laid.
9. according to WSS grouting and reinforcing assist gas pressure cutter replacing method in the shield tunnel described in claim 1 or 2, it is characterized in that: when carrying out tool changing in step 2, adopt normal pressure tool changing method, the cutter on described cutterhead is changed.
10. according to WSS grouting and reinforcing assist gas pressure cutter replacing method in the shield tunnel described in claim 1 or 2, it is characterized in that: when carrying out slip casting in step 1034, adopt retrusive slip casting method to carry out slip casting, grouting pressure is 0.2MPa ~ 0.3MPa.
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CN105971638A (en) * 2015-03-12 2016-09-28 中铁隆工程集团有限公司 Application of WSS construction method in shield tool changing reinforcement of water-rich sand layer
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CN113323675A (en) * 2021-05-19 2021-08-31 广州轨道交通建设监理有限公司 Shield under-pressure system and under-pressure warehouse entry reinforcing method

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