CN116591691A - Construction method of rectangular pipe pushing jack for improving construction precision - Google Patents
Construction method of rectangular pipe pushing jack for improving construction precision Download PDFInfo
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- CN116591691A CN116591691A CN202310726580.1A CN202310726580A CN116591691A CN 116591691 A CN116591691 A CN 116591691A CN 202310726580 A CN202310726580 A CN 202310726580A CN 116591691 A CN116591691 A CN 116591691A
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- 238000010276 construction Methods 0.000 title claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910001868 water Inorganic materials 0.000 claims abstract description 41
- 239000002689 soil Substances 0.000 claims abstract description 24
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 239000002002 slurry Substances 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 23
- 230000005641 tunneling Effects 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 17
- 238000004140 cleaning Methods 0.000 claims description 15
- 230000009974 thixotropic effect Effects 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 239000000440 bentonite Substances 0.000 claims description 4
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 206010000210 abortion Diseases 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 235000017550 sodium carbonate Nutrition 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/03—Driving non-circular tunnels
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
- E21D11/385—Sealing means positioned between adjacent lining members
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/40—Devices or apparatus specially adapted for handling or placing units of linings or supporting units for tunnels or galleries
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The application relates to the technical field of tunnel construction, and discloses a construction method of a rectangular pipe pushing jack capable of improving construction precision. The pipe joint jacking device aims at solving the technical problems that in the prior art, water leaks from an originating well and a receiving well portal, a pipe joint is jacked in and then retreats along with a pipe jacking machine to cause stratum collapse, the pipe jacking machine is easy to deflect, and a cutter disc of the pipe jacking machine is easy to form mud cakes to cause jacking difficulty of the pipe jacking machine. The application comprises the following steps: preparation of construction before jacking of the pipe jacking machine: installing a water stopping device at the opening of the starting well, and hoisting the pipe jacking machine by the starting device; jacking construction of an initial section of the pipe jacking machine: breaking the enclosure structure of the starting well, jacking and filling the pipe jacking machine, and cutting the soil body; jacking construction of a normal section of the pipe jacking machine: the push bench advances forwards; the pipe jacking receiving section is constructed, the application also provides a step of removing mud cake, and the mud cake removing device is connected with a pressure monitoring mechanism. The application improves the construction safety and the construction efficiency, eliminates the face deviation from the source, and has rapid and convenient debugging.
Description
Technical Field
The application relates to the technical field of tunnel construction, in particular to a construction method of a rectangular pipe pushing jack capable of improving construction precision.
Background
With the rapid development of urban construction, the demand for urban underground space development is increasing, and correspondingly, the construction demand and the construction purpose for strata are also becoming diversified. Not only urban underground space, but also the trend of safety and green development in a plurality of underground construction fields such as mine development, coal mine exploitation and the like in recent years is becoming more and more urgent. Based on such actual demands, a high requirement is put on the construction method. How to effectively implement stratum treatment construction or geological improvement construction, how to extend construction operation to a preset position in the stratum, and can better protect the stratum after tunneling development, and only the conventional underground construction mode can not be used for convenient and effective construction and treatment.
Chinese patent literature in the prior art: 202210217795A construction method of a vault jacking pipe at the entrance of a shield tunneling machine is disclosed. Installing a reaction device of a shield tunneling machine starting well, wherein the design height of the reaction device is required to be installed according to the distance between the design depth of the jacking pipe and the bottom of the foundation pit of +500mm plus or minus 50 mm; measuring and positioning according to the height of the drilling hole of the shield tunneling machine; installing a pipe jacking construction machine; carrying out pipe jacking construction operation; after the construction is finished, jacking pipe grouting is timely carried out; after grouting is finished, measuring and monitoring points are distributed; carrying out mechanical hoisting and drilling work of shield tunneling machines and the like; and monitoring the stability of the jacking pipe in the drilling process of the shield tunneling machine in time.
However, in the implementation process, the above scheme has at least the following technical problems: the water leakage phenomenon of the starting well and the receiving well portal easily occurs, the pipe joint is pushed in and then retreats along with the push bench to cause stratum collapse, the push bench is easy to deflect, and the push bench cutterhead is easy to form mud cakes to cause difficult push bench pushing and the like.
Disclosure of Invention
In view of the technical problems, the disclosure provides a construction method of a rectangular push bench for improving construction precision, which solves the technical problems that in the prior art, an originating well and a receiving well door leak water, a pipe section is pushed in and then retreats along with the push bench to cause stratum collapse, the push bench is easy to deflect, and a cutter disc of the push bench is easy to form mud cakes to cause difficult push bench pushing.
According to one aspect of the present disclosure, there is provided a construction method of a rectangular push bench for improving construction accuracy, comprising the steps of:
s1: preparation work and primary ring construction
Installing a water stopping device at the opening of the originating well, installing the originating device in the originating well, hoisting the pipe jacking machine, breaking the enclosure structure of the originating well from bottom to top in a layered manner, cleaning the construction site, and ensuring that the breaking size is not smaller than the size of the steel ring of the portal; after the construction site is cleaned, hoisting the pipe jacking machine, jacking forward, and after jacking for a distance of 0.5-1 annular pipe piece width, stopping jacking, conveying thixotropic slurry into a machine head soil bin, wherein the height of the bin is not less than half of the height of the equipment;
s2: jacking construction of normal section of pipe jacking machine
Tunneling forward of the push bench: after the bin is filled, the soil body is continuously jacked forward along the jacking axis, the soil bin pressure P of the push bench is controlled by adjusting the rotating speed of the screw conveyor so as to achieve the active soil pressure Pa < P < passive soil pressure Pp,
the tunneling process further comprises a step of removing the mud cake, wherein the step of removing the mud cake comprises the following steps of:
mud cake detection: the method comprises the steps that a slurry outlet is arranged on a tunnel face and is connected with thixotropic slurry/low-density slurry through a slurry pipeline, the slurry pipeline is driven by a hydraulic circuit, each branch of the hydraulic circuit is connected with a pressure detection device, when one or more pressure values rise, the phenomenon of mud cake formation is judged, and when the values rise to form an arithmetic series, the phenomenon of unbalanced stress of the tunnel face is judged;
slurry pipeline conversion, variable flow rate cleaning: the pipe jacking machine stops tunneling, a mud pipeline is started, mud cake flushing of a cutter disc is realized, and the pressure values fall back;
and (3) carrying out balanced stress adjustment on the tunnel face of the shield: the pressure detection device is connected with the master controller, the output end of the master controller is connected with the display screen, the master controller controls the flow valves of the hydraulic circuits, and the pressure regulation treatment is carried out on the oil pressure of each hydraulic circuit, so that the reverse pressure balance of the face is realized;
the tunneling process further comprises jacking axis deviation correction, the master controller is electrically connected with an observation table, the observation table is arranged in an originating well of the pipe jacking machine, an automatic leveling level is arranged on the observation table, a laser theodolite is arranged on the automatic leveling level, a laser is arranged on a telescope of the laser theodolite, and a laser detector is arranged on a measuring table in the pipe jacking machine shell; the jacking axis deviation rectifying process comprises the following steps of: setting the laser theodolite in the middle and leveling frame on the automatic leveling level, wherein a laser beam is a reference guide line of a jacking axis at the moment, when construction is started, the receiving target center of the laser detector coincides with a laser spot emitted by the laser, the laser detector indicates zero, after the pipe jacking machine starts tunneling, a machine head deviates, the laser spot emitted by the laser deviates from the receiving target center of the laser detector, a deviation control signal is given by a master controller, and then the direction of the machine head of the pipe jacking machine is corrected, so that the machine head of the pipe jacking machine advances along the direction of the laser beam;
and (3) installing a pipe joint: before each pipe section is installed, a water stop bar/water stop ring is installed in advance, the pipe section is hoisted by using a crawler crane, the pipe section is concentric and coaxial with the pipe jacking machine when installed, after each pipe section is pushed and pressed, the pipe jacking machine stops pushing, an oil cylinder of the pipe jacking machine retracts, a space for hoisting the next pipe section is reserved, the next pipe section is hoisted to the front of a top iron of the oil cylinder, and the pipe section is installed along a jacking axis;
installing a backstop device: after the jacking is finished, the two sides of the base are respectively provided with a backstop device;
s3: construction of pipe jacking receiving section
Mounting and receiving base and water stopping device: measuring the position of a tunnel portal, installing a push bench receiving base in a receiving well according to the elevation of the push bench, and installing a water stopping device in the tunnel portal of the receiving well;
breaking the receiving well enclosure structure and the receiving well receiving push bench: stopping jacking when the cutter head of the pipe push bench is 0.5-1 annular pipe piece width distance away from the receiving well enclosure structure, breaking the receiving well portal protection structure and cleaning the construction site;
after the construction site is cleaned, the pipe pushing machine pushes the receiving well to receive, welds the pipe joint and the hole ring, and fills the gap between the pipe joint and the hole ring with hydraulic slurry so as to fix the pipe joint and reduce water and soil loss;
separating the push bench from the pipe section and plugging the tunnel portal: after the pipe joint is fixed, the pipe push bench is separated from the pipe joint, and a receiving well portal is plugged by adopting a portal plate.
The water stopping device comprises a rubber water stopping ring (1) and a plurality of curtain cloth rubber plates (2) which are connected through bolts, and a plurality of corresponding screw holes are reserved on the rubber water stopping ring (1) and the curtain cloth rubber plates (2).
The starting device in the S1 comprises a starting base (7), wherein a contour track (8) parallel to the jacking axis is arranged on the starting base (7), a transmitting frame (9) and a steel backing (10) are connected on the track, and a concrete pouring/starting reaction frame is poured/installed at a gap between the steel backing (10) and a lining wall of a starting well.
The hoisting pipe jacking machine in the S1 comprises the following steps:
(1) Sequentially hoisting a front cylinder lower component and a front cylinder upper component, and fixing the front cylinder lower component and the track firmly; the lower part component of the front cylinder and the upper part component of the front cylinder are all provided with sockets;
(2) Sequentially hoisting a rear barrel lower assembly, a bolt conveyor and a rear barrel upper assembly, wherein the rear barrel lower assembly and the rear barrel upper assembly are respectively provided with a sealing rubber ring corresponding to the socket;
(3) Uniformly coating lithium-based lubricating grease at the socket and the sealing rubber ring, pushing the lower component of the rear cylinder into the lower component of the front cylinder by using a main top cylinder or an auxiliary cylinder, pushing the upper component of the rear cylinder into the upper component of the front cylinder, and controlling the pushing speed to realize that the sealing rubber ring enters the socket;
wherein the front barrel lower assembly, the front barrel upper assembly, the rear barrel lower assembly and the rear barrel upper assembly are all parallel to the jacking axis.
In the forward pushing process of the pipe pushing machine in the S2, an anti-deflection measure is also arranged; the anti-deflection measure comprises: a large-tonnage chain block is connected between a lifting rod and a well wall at one side of the push bench, a chain is tightened while the push bench is propelled, a stop block is welded on a shell of the push bench, and a foundation pit guide rail is matched to prevent the push bench from deflecting; and the push bench and the first two sections of pipes are connected into a whole to prevent the deflection of the push bench head.
S2 aborts and moves back device including a plurality of pillars (3), a plurality of pin (4), a plurality of pin seat (5) with pin (4) matched with, pillar (3) welding is on the base, in the lifting hole of pipe section (6) was inserted to pin (4), cooperation pin seat (5) fixed mounting, the back force that pipe section (6) produced was passed through pin (4), pin seat (5) in proper order and is transmitted on stopping device' S pillar (3).
The step of antifriction of the pipe joint is further included before the pipe joint is installed in the step S2, and comprises the step of lateral pressing thixotropic slurry on the outer side of the pipe joint on the inner side of the pipeline so as to form a circle of antifriction slurry sleeve around the pipeline, and friction between a soil body and the pipeline is reduced; the thixotropic slurry comprises bentonite, water, sodium carbonate, CMC (PAM) and emulsified oil.
And the step S3 is followed by a step of disassembly of the receiving well pipe-jacking machine, wherein the step of disassembly of the receiving well pipe-jacking machine comprises the following steps:
(1) Removing the connecting parts between the pipe pushing machine split bodies; (2) lifting the upper part of the front cylinder out of the receiving working well; (3) disassembling and installing a support frame of the mud cake cleaning device; (4) lifting the upper part of the rear cylinder out of the receiving working well; (5) lifting the screw conveyor out of the receiving work well; (6) lifting the lower part of the rear cylinder out of the receiving working well; and (7) lifting the lower part of the front cylinder out of the receiving working well.
The application has the beneficial effects that:
the construction safety and the construction efficiency are improved, and the maintenance cost in the later period of construction is reduced;
setting a water stopping device to install an originating well opening and a receiving well opening, and preventing serious quality safety accidents caused by the inflow of external soil and wall-touching mud into the originating well and the receiving well;
the anti-return device is arranged, the backward force of the pipe joint is transmitted to the anti-return device, and the problem that stratum collapse is caused by backward movement of the pipe joint along with the push bench after the pipe joint is pushed in is prevented, so that the pipe joint is stabilized;
adopting a deflection prevention measure to prevent the deflection of the push bench and avoid accidents;
the slurry flow passage is selected to be on or off, so that the detail control of forming or cleaning mud cake or modified slurry is facilitated, and the maintenance of later-stage equipment are also facilitated; the design of the inner pipe and the outer pipe is convenient for realizing or stirring the excavated soil to form thixotropic slurry or flushing the cutterhead of the pipe jacking machine, does not conflict with each other, and is independently used in different time; the diversion trench is convenient for low-density grouting, so that the stirring rod can be better washed, and mud cakes can be washed;
the pipe joint antifriction is arranged to reduce jacking resistance and earth surface subsidence;
an originating device is arranged to bear various loads in the jacking process of the push bench, and an originating well is not displaced, deformed and settled;
the automatic leveling level meter is automatically leveled on the observation table, and the performance is stable;
the laser theodolite guides the laser beam emitted by the laser into a telescope tube of the laser theodolite, so that the laser beam is emitted along the direction of a sight axis, and the alignment, the positioning, the angle measurement and the gradient measurement are performed based on the laser beam, the orientation of the head of the pipe jacking machine is corrected, the head of the pipe jacking machine advances along the direction of the laser beam, and the degree of automation is high;
the laser emits laser, and the light quality is pure and the spectrum is stable; the laser beam is beaten on the heading machine laser detector light target, the heading height and the left-right deviation are judged by observing the position of a point on the light target, the laser detector receives the laser emitted by the laser and detects the incidence angle and the position of the laser, the measurement is stable, the precision is high, and the heading machine laser detector light target is convenient and practical.
Drawings
FIG. 1 is a schematic view of a water stop device according to the present application;
FIG. 2 is a schematic diagram of an originating device according to the present application;
FIG. 3 is a schematic view of a stopping device according to the present application;
FIG. 4 is a perspective view showing the explosion effect of the grouting pipe group in the application;
FIG. 5 is a cross-sectional view of a construction of a grouting pipe group according to the application;
FIG. 6 is a cross-sectional view of the construction of the grouting pipe group in another working state according to the application;
the names of the components in the figure are as follows: 1. a rubber water stop ring; 2. a curtain cloth rubber plate; 3. a support post; 4. a pin; 5. a pin base; 6. a pipe section; 7. an originating base; 8. a track; 9. a transmitting frame; 10. steel reclining; 11. an external modified mud pipe; 12. an inner flushing pipe; 13. a through hole; 14 positioning a slideway; 15. and positioning the sliding groove.
Detailed Description
The preferred embodiments of the present application will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present application only, and are not intended to limit the present application.
Example 1
The embodiment discloses a construction method of a rectangular pipe pushing jack for improving construction precision, referring to fig. 1 to 6, comprising the following steps:
s1: preparation work and primary ring construction
Installing a water stopping device at the opening of the originating well, installing the originating device in the originating well, hoisting the pipe jacking machine, breaking the enclosure structure of the originating well from bottom to top in a layered manner, cleaning the construction site, and ensuring that the breaking size is not smaller than the size of the steel ring of the portal; after the construction site is cleaned, hoisting the pipe jacking machine, jacking forward, and after jacking for a distance of 0.5-1 annular pipe piece width, stopping jacking, conveying thixotropic slurry into a machine head soil bin, wherein the height of the bin is not less than half of the height of the equipment;
s2: jacking construction of normal section of pipe jacking machine
Tunneling forward of the push bench: after the bin is filled, the soil body is continuously jacked forward along the jacking axis, the soil bin pressure P of the push bench is controlled by adjusting the rotating speed of the screw conveyor so as to achieve the active soil pressure Pa < P < passive soil pressure Pp,
in the tunneling process, the method also comprises a step of removing the mud cake, wherein the step of removing the mud cake comprises the following steps of:
mud cake detection: the method comprises the steps that a slurry outlet is arranged on a tunnel face, thixotropic slurry/low-density slurry is connected through a slurry pipeline, the slurry pipeline is driven by a hydraulic circuit, each branch of the hydraulic circuit is connected with a pressure detection device, when one or more pressure values rise, the phenomenon of mud cake formation is judged, and when the values rise to form an arithmetic progression, the phenomenon of unbalanced stress of the tunnel face is judged;
slurry pipeline conversion, variable flow rate cleaning: the pipe jacking machine stops tunneling, a mud pipeline is started, mud cake flushing of a cutter disc is realized, and the pressure values fall back;
and (3) carrying out balanced stress adjustment on the tunnel face of the shield: the pressure detection device is connected with the master controller, the output end of the master controller is connected with the display screen, the master controller controls the flow valves of the hydraulic circuits, and the pressure regulation treatment is carried out on the oil pressure of each hydraulic circuit, so that the reverse balance of the face pressure is realized;
in the tunneling process, the tunneling machine further comprises a jacking axis deviation correction function, the master controller is electrically connected with an observation table, the observation table is arranged in a starting well of the push bench, an automatic leveling level meter is arranged on the observation table, a laser theodolite is arranged on the automatic leveling level meter, a laser is arranged on a telescope of the laser theodolite, and a laser detector is arranged on a measuring table in a shell of the push bench; the jacking axis deviation rectifying process comprises the following steps: setting the laser theodolite in the middle and leveling frame on an automatic leveling level, wherein a laser beam is a reference guide line of a jacking axis at the moment, when construction is started, the receiving target center of the laser detector coincides with a laser spot emitted by the laser, the laser detector indicates zero, after the pipe jacking machine starts tunneling, a machine head generates deviation, the laser spot emitted by the laser deviates from the receiving target center of the laser detector, and a total controller gives a deviation control signal to correct the machine head direction of the pipe jacking machine, so that the machine head of the pipe jacking machine advances along the laser beam direction;
and (3) installing a pipe joint: before each pipe section is installed, a water stop bar/water stop ring is installed in advance, the pipe section is hoisted by using a crawler crane, the pipe section is concentric and coaxial with the pipe jacking machine when installed, after each pipe section is pushed and pressed, the pipe jacking machine stops pushing, an oil cylinder of the pipe jacking machine retracts, a space for hoisting the next pipe section is reserved, the next pipe section is hoisted to the front of a top iron of the oil cylinder, and the pipe section is installed along a jacking axis;
installing a backstop device: after the jacking is finished, the two sides of the base are respectively provided with a backstop device;
s3: construction of pipe jacking receiving section
Mounting and receiving base and water stopping device: measuring the position of a tunnel portal, installing a push bench receiving base in a receiving well according to the elevation of the push bench, and installing a water stopping device in the tunnel portal of the receiving well;
breaking the receiving well enclosure structure and the receiving well receiving push bench: stopping jacking when the cutter head of the pipe push bench is 0.5-1 annular pipe piece width distance away from the receiving well enclosure structure, breaking the receiving well portal protection structure and cleaning the construction site;
after the construction site is cleaned, the pipe pushing machine pushes the receiving well to receive, welds the pipe joint and the hole ring, and fills the gap between the pipe joint and the hole ring with hydraulic slurry so as to fix the pipe joint and reduce water and soil loss;
separating the push bench from the pipe section and plugging the tunnel portal: after the pipe joint is fixed, the pipe push bench is separated from the pipe joint, and a receiving well portal is plugged by adopting a portal plate.
S1, water stopping device installs an originating well opening, S4, water stopping device installs a receiving well opening, flanges are reserved at the originating well opening and the receiving well opening, a water stopping device is respectively connected with the originating well and the receiving well through the flanges, the water stopping device comprises a rubber water stopping ring (1) and a plurality of curtain cloth rubber plates (2) which are connected through bolts, and a plurality of corresponding screw holes are reserved on the rubber water stopping ring (1) and the curtain cloth rubber plates (2).
The starting device in S1 comprises a starting base (7), a contour rail (8) parallel to the jacking axis is arranged on the starting base (7), a transmitting frame (9) and a steel backing (10) are connected on the rail, and a concrete is poured/a starting reaction frame is arranged at a gap between the steel backing (10) and a lining wall of a starting well.
The hoisting pipe jacking machine in S1 comprises the following steps:
(1) Sequentially hoisting a front cylinder lower component and a front cylinder upper component, and fixing the front cylinder lower component and the track firmly; the lower part component of the front cylinder and the upper part component of the front cylinder are all provided with sockets;
(2) Sequentially hoisting a rear barrel lower assembly, a bolt conveyor and a rear barrel upper assembly, wherein the rear barrel lower assembly and the rear barrel upper assembly are respectively provided with a sealing rubber ring corresponding to the socket;
(3) Uniformly coating lithium-based lubricating grease at the socket and the sealing rubber ring, pushing the lower component of the rear cylinder into the lower component of the front cylinder by using a main top cylinder or an auxiliary cylinder, pushing the upper component of the rear cylinder into the upper component of the front cylinder, and controlling the pushing speed to realize that the sealing rubber ring enters the socket;
wherein the front barrel lower assembly, the front barrel upper assembly, the rear barrel lower assembly and the rear barrel upper assembly are all parallel to the jacking axis.
In the forward pushing process of the push bench in S2, an anti-deflection measure is also arranged; the anti-deflection measure comprises: a large-tonnage chain block is connected between a lifting rod and a well wall at one side of the push bench, a chain is tightened while the push bench is propelled, a stop block is welded on a shell of the push bench, and a foundation pit guide rail is matched to prevent the push bench from deflecting; and the push bench and the first two sections of pipes are connected into a whole to prevent the deflection of the push bench head.
The anti-deflection measure comprises:
the position distribution of the correction oil cylinder is judged when the rear cylinder of the push bench is seen forwards, and at the moment:
if the head of the push bench is upward tilted, the lower group of cylinders extend out, the left and right side cylinders follow up, and the upper side cylinders are locked;
if the head of the push bench is downward pushed, the upper group of cylinders extend out, the left and right side cylinders follow up, and the lower side cylinders are locked;
if the head of the push bench is left-biased, the right group of cylinders extend out, the upper and lower side cylinders follow up, and the left side cylinder is locked;
if the head of the push bench is right-biased, the left group of cylinders extend out, the upper and lower side cylinders follow up, and the right side cylinder is locked;
if the vertical deviation and the horizontal deviation are generated at the same time, the vertical deviation is corrected first, and then the horizontal deviation is corrected.
S2 aborts and moves back device including a plurality of pillars (3), a plurality of pin (4), a plurality of key seat (5) with pin (4) matched with, pillar (3) welding is on the base, and in the hoist and mount hole of pin (4) inserted tube coupling (6), cooperation key seat (5) fixed mounting, the recoil that tube coupling (6) produced is passed through pin (4), key seat (5) in proper order and is transmitted on pillar (3) of stopping device.
The step of antifriction of the pipe joint is further included before the pipe joint is installed in the S2, and comprises the step of lateral pressure injection of thixotropic slurry on the outer side of the pipe joint on the inner side of the pipeline so as to form a circle of antifriction slurry sleeve around the pipeline, and friction between a soil body and the pipeline is reduced; thixotropic slurries include bentonite, water, soda ash, CMC (PAM), and emulsified oil.
The mud proportions (in kg/m 3) are shown in the following table
Antifriction mud mixing proportion table (unit kg/m 3)
| Sequence number | Bentonite clay | Water and its preparation method | Soda ash | CMC（PAM） | Emulsified oil |
| 1 | 200～250 | 350 | 2.5～4.5 | 1.5～2.5 | |
| 2 | 350 | 800 | 5 | 3 | 7 |
The combined mud system is characterized by further comprising a combined mud system consisting of a sleeve, wherein in the combined mud system, the mud modification in the tunneling process and the cleaning, early warning and treatment of mud cake are realized, and further, in the cleaning process of the mud cake, the specific step of judging whether the reverse monitoring face is inclined or not through pressure is synchronously introduced. Eliminating the inducement of starting tilting and ensuring the stable operation of the equipment as a whole.
And S3, the method further comprises a step of disassembling the receiving well pipe-jacking machine, wherein the step of disassembling the receiving well pipe-jacking machine comprises the following steps of:
(1) Removing the connecting parts between the pipe pushing machine split bodies; (2) lifting the upper part of the front cylinder out of the receiving working well; (3) disassembling and installing a support frame of the mud cake cleaning device; (4) lifting the upper part of the rear cylinder out of the receiving working well; (5) lifting the screw conveyor out of the receiving work well; (6) lifting the lower part of the rear cylinder out of the receiving working well; and (7) lifting the lower part of the front cylinder out of the receiving working well.
While certain preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, the present application is intended to include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A construction method for improving construction precision of a rectangular pipe jacking machine is characterized by comprising the following steps: the method comprises the following steps:
s1: preparation work and primary ring construction
Installing a water stopping device at the opening of the originating well, installing the originating device in the originating well, hoisting the pipe jacking machine, breaking the enclosure structure of the originating well from bottom to top in a layered manner, cleaning the construction site, and ensuring that the breaking size is not smaller than the size of the steel ring of the portal; after the construction site is cleaned, hoisting the pipe jacking machine, jacking forward, and after jacking for a distance of 0.5-1 annular pipe piece width, stopping jacking, conveying thixotropic slurry into a machine head soil bin, wherein the height of the bin is not less than half of the height of the equipment;
s2: jacking construction of normal section of pipe jacking machine
Tunneling forward of the push bench: after the bin is filled, the soil body is continuously jacked forward along the jacking axis, the soil bin pressure P of the push bench is controlled by adjusting the rotating speed of the screw conveyor so as to achieve the active soil pressure Pa < P < passive soil pressure Pp,
the tunneling process further comprises a step of removing the mud cake, wherein the step of removing the mud cake comprises the following steps of:
mud cake detection: the method comprises the steps that a slurry outlet is arranged on a tunnel face and is connected with thixotropic slurry/low-density slurry through a slurry pipeline, the slurry pipeline is driven by a hydraulic circuit, each branch of the hydraulic circuit is connected with a pressure detection device, when one or more pressure values rise, the phenomenon of mud cake formation is judged, and when the values rise to form an arithmetic series, the phenomenon of unbalanced stress of the tunnel face is judged;
slurry pipeline conversion, variable flow rate cleaning: the pipe jacking machine stops tunneling, a mud pipeline is started, mud cake flushing of a cutter disc is realized, and the pressure values fall back;
and (3) carrying out balanced stress adjustment on the tunnel face of the shield: the pressure detection device is connected with the master controller, the output end of the master controller is connected with the display screen, the master controller controls the flow valves of the hydraulic circuits, and the pressure regulation treatment is carried out on the oil pressure of each hydraulic circuit, so that the reverse pressure balance of the face is realized;
the tunneling process further comprises jacking axis deviation correction, the master controller is electrically connected with an observation table, the observation table is arranged in an originating well of the pipe jacking machine, an automatic leveling level is arranged on the observation table, a laser theodolite is arranged on the automatic leveling level, a laser is arranged on a telescope of the laser theodolite, and a laser detector is arranged on a measuring table in the pipe jacking machine shell; the jacking axis deviation rectifying process comprises the following steps of: setting the laser theodolite in the middle and leveling frame on the automatic leveling level, wherein a laser beam is a reference guide line of a jacking axis at the moment, when construction is started, the receiving target center of the laser detector coincides with a laser spot emitted by the laser, the laser detector indicates zero, after the pipe jacking machine starts tunneling, a machine head deviates, the laser spot emitted by the laser deviates from the receiving target center of the laser detector, a deviation control signal is given by a master controller, and then the direction of the machine head of the pipe jacking machine is corrected, so that the machine head of the pipe jacking machine advances along the direction of the laser beam;
and (3) installing a pipe joint: before each pipe section is installed, a water stop bar/water stop ring is installed in advance, the pipe section is hoisted by using a crawler crane, the pipe section is concentric and coaxial with the pipe jacking machine when installed, after each pipe section is pushed and pressed, the pipe jacking machine stops pushing, an oil cylinder of the pipe jacking machine retracts, a space for hoisting the next pipe section is reserved, the next pipe section is hoisted to the front of a top iron of the oil cylinder, and the pipe section is installed along a jacking axis;
installing a backstop device: after the jacking is finished, the two sides of the base are respectively provided with a backstop device;
s3: construction of pipe jacking receiving section
Mounting and receiving base and water stopping device: measuring the position of a tunnel portal, installing a push bench receiving base in a receiving well according to the elevation of the push bench, and installing a water stopping device in the tunnel portal of the receiving well;
breaking the receiving well enclosure structure and the receiving well receiving push bench: stopping jacking when the cutter head of the pipe push bench is 0.5-1 annular pipe piece width distance away from the receiving well enclosure structure, breaking the receiving well portal protection structure and cleaning the construction site;
after the construction site is cleaned, the pipe pushing machine pushes the receiving well to receive, welds the pipe joint and the hole ring, and fills the gap between the pipe joint and the hole ring with hydraulic slurry so as to fix the pipe joint and reduce water and soil loss;
separating the push bench from the pipe section and plugging the tunnel portal: after the pipe joint is fixed, the pipe push bench is separated from the pipe joint, and a receiving well portal is plugged by adopting a portal plate.
2. The construction method for improving construction accuracy of the rectangular pipe pushing jack according to claim 1, wherein: the water stopping device comprises a rubber water stopping ring (1) and a plurality of curtain cloth rubber plates (2) which are connected through bolts, and a plurality of corresponding screw holes are reserved on the rubber water stopping ring (1) and the curtain cloth rubber plates (2).
3. The construction method for improving construction accuracy of the rectangular pipe pushing jack according to claim 1, wherein: the starting device in the S1 comprises a starting base (7), wherein a contour track (8) parallel to the jacking axis is arranged on the starting base (7), a transmitting frame (9) and a steel backing (10) are connected on the track, and a concrete pouring/starting reaction frame is poured/installed at a gap between the steel backing (10) and a lining wall of a starting well.
4. The construction method for improving construction accuracy of the rectangular pipe pushing jack according to claim 1, wherein: the hoisting pipe jacking machine in the S1 comprises the following steps:
(1) Sequentially hoisting a front cylinder lower component and a front cylinder upper component, and fixing the front cylinder lower component and the track firmly; the lower part component of the front cylinder and the upper part component of the front cylinder are all provided with sockets;
(2) Sequentially hoisting a rear barrel lower assembly, a bolt conveyor and a rear barrel upper assembly, wherein the rear barrel lower assembly and the rear barrel upper assembly are respectively provided with a sealing rubber ring corresponding to the socket;
(3) Uniformly coating lithium-based lubricating grease at the socket and the sealing rubber ring, pushing the lower component of the rear cylinder into the lower component of the front cylinder by using a main top cylinder or an auxiliary cylinder, pushing the upper component of the rear cylinder into the upper component of the front cylinder, and controlling the pushing speed to realize that the sealing rubber ring enters the socket;
wherein the front barrel lower assembly, the front barrel upper assembly, the rear barrel lower assembly and the rear barrel upper assembly are all parallel to the jacking axis.
5. The construction method for improving construction accuracy of the rectangular pipe pushing jack according to claim 1, wherein: in the forward pushing process of the pipe pushing machine in the S2, an anti-deflection measure is also arranged; the anti-deflection measure comprises: a large-tonnage chain block is connected between a lifting rod and a well wall at one side of the push bench, a chain is tightened while the push bench is propelled, a stop block is welded on a shell of the push bench, and a foundation pit guide rail is matched to prevent the push bench from deflecting; and the push bench and the first two sections of pipes are connected into a whole to prevent the deflection of the push bench head.
6. The construction method for improving construction accuracy of the rectangular pipe pushing jack according to claim 1, wherein: s2 aborts and moves back device including a plurality of pillars (3), a plurality of pin (4), a plurality of pin seat (5) with pin (4) matched with, pillar (3) welding is on the base, in the lifting hole of pipe section (6) was inserted to pin (4), cooperation pin seat (5) fixed mounting, the back force that pipe section (6) produced was passed through pin (4), pin seat (5) in proper order and is transmitted on stopping device' S pillar (3).
7. The construction method for improving construction accuracy of the rectangular pipe pushing jack according to claim 1, wherein: the step of antifriction of the pipe joint is further included before the pipe joint is installed in the step S2, and comprises the step of lateral pressing thixotropic slurry on the outer side of the pipe joint on the inner side of the pipeline so as to form a circle of antifriction slurry sleeve around the pipeline, and friction between a soil body and the pipeline is reduced; the thixotropic slurry comprises bentonite, water, sodium carbonate, CMC (PAM) and emulsified oil.
8. The construction method for improving construction accuracy of the rectangular pipe pushing jack according to claim 1, wherein: and the step S3 is followed by a step of disassembly of the receiving well pipe-jacking machine, wherein the step of disassembly of the receiving well pipe-jacking machine comprises the following steps:
removing the connecting parts between the pipe pushing machine split bodies; (2) lifting the upper part of the front cylinder out of the receiving working well; (3) disassembling and installing a support frame of the mud cake cleaning device; (4) lifting the upper part of the rear cylinder out of the receiving working well; (5) lifting the screw conveyor out of the receiving work well; (6) lifting the lower part of the rear cylinder out of the receiving working well; and (7) lifting the lower part of the front cylinder out of the receiving working well.
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| CN202310726580.1A CN116591691A (en) | 2023-06-19 | 2023-06-19 | Construction method of rectangular pipe pushing jack for improving construction precision |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116804370A (en) * | 2023-08-28 | 2023-09-26 | 中铁第六勘察设计院集团有限公司 | Anti-deviation device for pipe jacking tunneling and using method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116804370A (en) * | 2023-08-28 | 2023-09-26 | 中铁第六勘察设计院集团有限公司 | Anti-deviation device for pipe jacking tunneling and using method |
| CN116804370B (en) * | 2023-08-28 | 2023-11-10 | 中铁第六勘察设计院集团有限公司 | Anti-deviation device for pipe jacking tunneling and using method |
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Effective date of registration: 20240126 Address after: 530000 No. 69, Yunjing Road, Nanning, Guangxi Zhuang Autonomous Region Applicant after: NANNING RAIL TRANSIT CO.,LTD. Country or region after: China Applicant after: Nanning Rail Transit Construction Co.,Ltd. Applicant after: STATE KEY LABORATORY OF SHIELD MACHINE AND BORING TECHNOLOGY Applicant after: CHINA RAILWAY TUNNEL GROUP Co.,Ltd. Address before: 530000 No. 69, Yunjing Road, Nanning, Guangxi Zhuang Autonomous Region Applicant before: NANNING RAIL TRANSIT CO.,LTD. Country or region before: China Applicant before: STATE KEY LABORATORY OF SHIELD MACHINE AND BORING TECHNOLOGY Applicant before: CHINA RAILWAY TUNNEL GROUP Co.,Ltd. |