CN113446014A - Underwater major-diameter shield continuous tunneling construction tool with deformed tail shield and construction method - Google Patents
Underwater major-diameter shield continuous tunneling construction tool with deformed tail shield and construction method Download PDFInfo
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- CN113446014A CN113446014A CN202110886418.7A CN202110886418A CN113446014A CN 113446014 A CN113446014 A CN 113446014A CN 202110886418 A CN202110886418 A CN 202110886418A CN 113446014 A CN113446014 A CN 113446014A
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- 230000005641 tunneling Effects 0.000 title claims abstract description 44
- 238000010276 construction Methods 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 227
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 12
- 230000000712 assembly Effects 0.000 claims description 6
- 238000000429 assembly Methods 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 4
- 229920002943 EPDM rubber Polymers 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000002775 capsule Substances 0.000 claims description 2
- 238000003754 machining Methods 0.000 claims description 2
- 239000008235 industrial water Substances 0.000 abstract description 3
- 238000012937 correction Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
-
- 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
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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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
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- 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)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a deformed underwater large-diameter shield continuous tunneling construction tool, which comprises a water delivery unit, a plurality of high-pressure water bags and a plurality of guide strips, wherein the high-pressure water bags are respectively fixed on the inner wall of a tail shield shell and positioned between the inner wall of the tail shield shell and the outer peripheral surface of a segment ring. The water delivery unit comprises an industrial water tank, input water pipes, a high-pressure water pump, an output water pipe and a tail end hose, wherein the input water pipes of a group of the plurality of high-pressure water bags are connected in parallel to form a main input water pipe, and one end of the tail end hose of the water delivery unit is connected with the group of the plurality of high-pressure water bags through a quick connector and the main input water pipe. The construction method comprises the steps of 1) respectively installing high-pressure water bags and connecting the high-pressure water bags with water delivery units, 2) assembling a circle of segment rings, and 3) sequentially completing water injection and pressurization of the high-pressure water bag units in the circle of segment rings. 4) And (5) shield tunneling and monitoring. The invention can prevent the deformed inner wall of the tail shield shell from extruding the pipe piece block, reduces the damage of the pipe piece in the formed tunnel, improves the construction efficiency and reduces the construction cost.
Description
Technical Field
The invention relates to a construction tool and a construction method for an underwater tunnel, in particular to a construction tool and a construction method for a tail shield of an underwater large-diameter shield to continue tunneling after plastic deformation, and belongs to the technical field of tunnel engineering.
Background
The shield is one of main equipment for building underwater tunnels penetrating rivers and undersea, and in recent years, the shield is developing towards the direction of large depth, large section and long distance, and a batch of undersea or river bottom tunnels and urban road tunnels with large diameter (the diameter of the section of the tunnel is between 8 and 14 m) and even super-large diameter (the diameter of the section of the tunnel is more than 14 m) are gradually built at home and abroad.
With the increasing of the types of the shield penetrating the stratum, the construction difficulty is gradually increased, and higher requirements are provided for the manufacturing technology and the tunneling control of the shield. The large-diameter shield is a shield with the diameter of 8-14 m, the shield excavation path is easy to deviate under the comprehensive action of various resistances in the tunneling process of the large-diameter shield in a dense stratum, deviation correction needs to be carried out in time, and larger foundation counter force and passive soil pressure can be generated in the deviation correction process of the shield. The tail shield of the shield is used as a working space for segment transportation and assembly, the thin-wall cylindrical structure is adopted to cause the tail shield to be the weakest part of the shield strength and rigidity, the shield tunneling is influenced due to the fact that the shield body is insufficient in safety storage, poor operation, long-term snake-shaped advancing and the like can cause the tail shield shell to generate plastic deformation with different degrees, and even the oil cylinder support shoe and the tail shield are rubbed, the segments are tightly attached to the tail shield and the like, so that the shield cannot continue to advance.
The existing tail shield shell deformation correction method is as follows: firstly, cutting off a window on the tail shield shell in a deformation area, then cleaning external concretions or barriers, and then carrying out full circle correction on the tail shield shell and welding the cut-off window in a repair mode. The invention patent application of application number 202010575523.4 discloses a circular ring-shaped tool and a method for deformation correction of a large-diameter shield tail shield in a strong permeable sand layer, the application adopts auxiliary measures such as matching the circular ring-shaped tool with a hole for sand discharge and the like to realize deformation correction and rounding of the tail shield, and can ensure that a gap is opened between a tail shield steel plate and an oil cylinder supporting shoe and a forming pipe piece, so that the shield is trapped off. The invention patent application with application number 202010711631.X discloses a correction tool for treating shield tail deformation in a water-rich sand layer and a construction process thereof, which can rapidly realize assembly and disassembly operations, meet the requirement of repeated use and provide guarantee for subsequent normal tunneling of a shield. Can be used as a conventional shield correction means and has wide application range. However, the tail shield deformation correction construction method has the defects of complex structure processing, long construction period, high safety risk and the like.
Disclosure of Invention
The invention aims to provide a construction tool and a construction method for continuously tunneling an underwater large-diameter shield with a deformed tail shield, which can ensure the normal tunneling of the shield without correcting the deformed tail shield.
The invention is realized by the following technical scheme:
a deformed underwater large-diameter shield continuous tunneling construction tool comprises a water delivery unit, a plurality of high-pressure water bags and a plurality of guide strips, wherein the guide strips are uniformly distributed along the radial direction of the inner wall of a tail shield shell and are respectively fixed on the inner wall of the tail shield shell; the high-pressure water bag is positioned between the two guide strips, is respectively fixed on the inner wall of the tail shield shell and is positioned between the inner wall of the tail shield shell and the outer peripheral surface of the segment ring; the water delivery unit is including the industry water tank, input water pipe, high pressure water pump, delivery pipe and the terminal hose of connecting in order, and the manometer is other to be connected on delivery pipe, and the industry water tank is located the shield and constructs, and high pressure water pocket input water pipe has connect the stop valve respectively, and the parallelly connected total input water pipe all the way of several high pressure water pocket input water pipe, total input water pipe one end and quick-operation joint fixed connection, the terminal hose one end of water delivery unit loops through quick-operation joint, total input water pipe, high pressure water pocket input water pipe and links to each other with several high pressure water pocket.
The object of the invention is further achieved by the following technical measures.
Further, the high-pressure water bag includes utricule, several horizontal bands and a vertical band, and several horizontal bands that the interval set up wind the horizontal a week of utricule respectively, and a vertical band is around the vertical central a week of utricule, horizontal band and vertical band bond fixation are respectively on the utricule, and high-pressure water bag one end and both sides are equipped with the connecting plate respectively at the interval, and the high-pressure water bag is fixed on tail shield shells inner wall through the fastening screw who passes the connecting plate.
Furthermore, the water filling pressure of the high-pressure water bag is 1.0-1.5 Mpa, and the thickness of the high-pressure water bag is more than or equal to 40mm after water filling and pressurization.
Furthermore, the material of utricule adopts wear-resisting rubber. The transverse bridle and the longitudinal bridle are both made of ethylene propylene diene monomer rubber.
A construction method of an underwater large-diameter shield continuous tunneling construction tool with a deformed tail shield comprises the following steps:
1) respectively installing a high-pressure water bag: determining the position of the center of a positioning hole of a connecting plate of the high-pressure water bag according to the progress of the segment assembling process and the position requirement of installing the high-pressure water bag on the inner wall of the tail shield shell; respectively drilling holes in exposed areas of the tail shield by using a magnetic drilling machine, and then performing machine tapping or manual tapping to finish machining of threaded holes in the inner wall of the shell of the tail shield one by one; then, fastening screws respectively transversely penetrate through the connecting plate positioning holes of the high-pressure water bag and are screwed into the corresponding threaded holes, so that the high-pressure water bag is respectively fixed between 2 guide strips at the corresponding positions of the inner wall of the tail shield shell; starting from the bottom of the inner wall of the tail shield shell, a plurality of high-pressure water bags are longitudinally and adjacently arranged to form a ring around the inner wall of the tail shield shell, and the length of each high-pressure water bag is matched with the width of a circle of segment rings to be laid;
2) the high-pressure water sac unit is connected with the water delivery unit: dividing a plurality of high-pressure water bags on the periphery of the inner wall of a tail shield shell into a plurality of high-pressure water bag units according to the vertical radial elevation of a shield, wherein each high-pressure water bag unit comprises a plurality of high-pressure water bags, input water pipes of the plurality of high-pressure water bags are connected in parallel to form a main input pipe and then are fixedly connected with a quick connector, and one end of a tail end hose of each water delivery unit is connected with the quick connector at the end of the main input pipe of each high-pressure water bag unit respectively to complete the connection of the high-pressure water bag units and the water delivery units;
3) assembling a ring of pipe sheet rings: comprehensively evaluating the extension stroke, the shield posture and the shield tail clearance of a shield oil cylinder, and determining the splicing point position of a capping F pipe piece block in a tail shield; the method comprises the following steps of adopting an installation mode of assembling adjacent standard pipe piece blocks and adjacent pipe piece blocks in a staggered manner, firstly assembling B3 standard block pipe pieces at the bottom of a circle of pipe piece rings, then assembling the standard block pipe pieces and the adjacent pipe piece blocks in a left-right crossed manner, timely and sequentially screwing a plurality of ring longitudinal seam connecting bolt and nut assemblies of the adjacent pipe piece blocks, finally inserting a top-sealed F pipe piece block along the axial direction of a tunnel, and sequentially and finally screwing all ring longitudinal seam connecting bolt and nut assemblies to finish the assembling of the circle of pipe piece rings;
4) water injection pressurization high-pressure water bag unit: after the assembly of a circle of segment rings is finished, firstly, respectively opening stop valves of all high-pressure water bags of a group of high-pressure water bag units, then starting a high-pressure water pump of a water delivery unit to inject water into all the high-pressure water bags for pressurization, and controlling by taking the reading of a pressure gauge as a standard; each group of water pressure is based on the water and soil pressure outside the shield body at the elevation position of the high-pressure water bag, and in the pressurizing process, the tightening condition of the ring longitudinal seam connecting bolt and nut assembly and the segment ring longitudinal seam is observed, so that the water pressure of the high-pressure water bag is adjusted correspondingly in time; after water injection and pressurization are finished, the high-pressure water pump is closed, then the stop valves of the high-pressure water bags are closed respectively, and finally the ring longitudinal joint connecting bolt and nut assembly is tightened in time;
5) and (3) completing water injection and pressurization of the rest high-pressure water sac units in the ring of the segment ring in sequence: repeating the process of the step 4), and gradually completing water injection and pressurization of the rest high-pressure water sac units in the ring of the segment;
6) shield tunneling and monitoring: the shield adopts a sectional type tunneling mode, and is tunneled in two stages according to the width of the segment ring, wherein the tunneling depth of the first stage is 3/4 of the width of the segment ring, and the tunneling depth of the second stage is 1/4 of the width of the segment ring; the first stage mainly controls the tunneling speed of the shield, the shield attitude is assisted, and the second stage mainly controls the shield attitude; the distance C from the inner wall of the tail shield shell to the end face of the oil cylinder supporting shoe, namely the shield tail clearance is more than or equal to 40 mm; when the shield tunneling distance reaches 175-185 cm, performing full-circle measurement on shield tail gaps of all point positions according to the point positions of the shield oil cylinder, and measuring the distance between guide strips of a plastic deformation area of a tail shield shell; when the shield finishes 20-30 pipe sheet rings every time the shield is tunneled, a total station is adopted to measure the roundness of the shield tail, and the roundness of the shield tail is drawn based on the curve fitting principle of the least square method, so that the deformation condition of the tail shield shell is mastered; according to the shield tail clearance and the roundness change condition of the tail shield shell, the assembling sequence of the duct piece blocks of the duct piece ring is reasonably selected, and the water pressure of the high-pressure water bag in the corresponding area is reasonably adjusted according to the deformation of different positions of the annular surface of the tail shield shell, so that the duct piece blocks in the area cannot be extruded by the deformed tail shield shell, and the shield can be ensured to normally tunnel. The shield tunneling speed is 25-35 mm/min.
According to the invention, a plurality of groups of high-pressure water bags surrounding the inner wall of the tail shield shell by a circle are additionally arranged between the inner wall of the tail shield shell and the outer peripheral surface of the duct piece, and the tail shield shell and the duct piece are separated by the high-pressure water bags, so that a large structural member is not required to be used for tail shield deformation correction and shield structure reinforcement, the construction safety risk is effectively reduced, and the normal tunneling of the shield can be ensured on the premise of not influencing the tunneling efficiency. The shield tunneling and monitoring method is simple and convenient to operate and convenient to implement on a construction site. According to the invention, the segment blocks of the ring of segment rings are pre-tightened in advance, so that the circumferential fixed connection between the segment blocks of the segment rings is stable and reliable, the segment blocks are prevented from being extruded by the inner wall of the deformed tail shield shell, the damage of the segment in the formed tunnel is reduced, the construction efficiency is improved, and the construction cost is reduced.
Advantages and features of the present invention will be illustrated and explained by the following non-restrictive description of preferred embodiments thereof, given by way of example only with reference to the accompanying drawings.
Drawings
FIG. 1 is a sectional view of a segment of the present invention;
FIG. 2 is a schematic view of the 45 th to 47 th tube sheet rings expanded;
FIG. 3 is a schematic view of the connection of the high pressure water bladder unit and the water delivery unit of the present invention;
FIG. 4 is an enlarged view of section I of FIG. 1;
fig. 5 is a view from direction a of fig. 4.
Detailed Description
The invention will be further described with reference to the accompanying drawings and an embodiment of a shield excavation with a diameter of 12.12 m.
As shown in fig. 1 and 2, the segment ring 10 installed in the tail shield comprises eight segment blocks from B3 segment block at the bottom to F segment block at the top, including B1 to B5, L1, L2 and F, wherein two ends of the F segment block installed last are inclined, the segment blocks 101 adjacent to two ends of the F segment block are respectively an L1 abutting block and an L2 abutting block, the inclined surface at one end of the L1 abutting block and the inclined surface at one end of the L2 abutting block are respectively matched with the inclined surfaces at two ends of the F segment block, so that the F segment block is installed between the L1 abutting block and the L2 abutting block in an embedded manner from the axial direction of the tunnel, and forms a closed segment ring 10 with the B1 to B5 standard blocks installed earlier. In the 45 th to 47 th ring groups of adjacent segment rings 10 of a tunnel shown in fig. 2, the joints between the segment blocks 101 of each segment ring 10 group are staggered from the joints between the segment blocks 101 of the adjacent segment rings 10 group.
The numbers 1-23 in the circle of the shield outer peripheral surface in fig. 1 represent 23 shield oil cylinders 20 arranged in a circle in the shield. The end of the piston rod 201 of the oil cylinder shown in fig. 5 is connected with the right side of the oil cylinder supporting shoe 30, the oil cylinder supporting shoe 30 comprises a nylon buffer plate 301 and a supporting block 302 which are fixedly connected into a whole, the nylon buffer plate 301 on the left side of the oil cylinder supporting shoe 30 is pressed on the right end face of the pipe piece block 101, and the end face of each pipe piece block 101 is pressed by 2 or 3 oil cylinder supporting shoes 30. The plurality of oil cylinder piston rods 201 simultaneously push the corresponding oil cylinder supporting shoes 30, and the segment blocks 101 are pushed to move towards the installed segment rings 10 through the movement of the oil cylinder supporting shoes 30, so that the axial clearance between the segment blocks and the installed segment rings 10 is eliminated, and the construction quality of the underwater tunnel is improved.
As shown in fig. 3 and 4, the construction tool of the embodiment includes a water delivery unit 1, a plurality of high-pressure water bags 2 and a plurality of guide strips 3, wherein the plurality of guide strips 3 are radially and uniformly distributed along the inner wall of the tail shield shell 401 and are respectively fixed on the inner wall of the tail shield shell 401, the high-pressure water bags 2 are located between the two guide strips 3, are respectively fixed on the inner wall of the tail shield shell 401, and are located between the inner wall of the tail shield shell 401 and the outer peripheral surface of the segment ring 10. The water delivery unit 1 comprises an industrial water tank 11, an input water pipe 12, a high-pressure water pump 13, an output water pipe 14 and a tail end hose 15 which are connected in sequence, a pressure gauge 16 is connected to the output water pipe 14 in a side-by-side mode, the industrial water tank 11 is located in a shield 40, the high-pressure water bag input water pipes 21 are respectively connected with stop valves 22, the high-pressure water bag input water pipes 21 of a plurality of high-pressure water bags 2 are firstly connected in parallel to form a main input water pipe 23, one end of the main input water pipe 23 is fixedly connected with a quick connector 24, and one end of the tail end hose 15 of the water delivery unit 1 is connected with the plurality of high-pressure water bags 2 sequentially through the quick connector 24, the main input water pipe 23 and the high-pressure water bag input water pipe 21.
The high-pressure water bag 2 comprises a bag body 21, three transverse belts 211 and a longitudinal belt 212, the three transverse belts 211 arranged at intervals are respectively wound around the bag body 21 for a transverse circle, the longitudinal belt 212 is wound around the bag body 21 for a longitudinal center circle, the transverse belts 211 and the longitudinal belts 212 are respectively bonded and fixed on the bag body 21, 2 connecting plates 25 are arranged at one end of the high-pressure water bag 2 side by side, 2 connecting plates 25 are respectively arranged at two sides of the high-pressure water bag 2 at intervals, and the high-pressure water bag 2 is fixed on the inner wall of the tail shield shell 401 through fastening screws 26 penetrating through the connecting plates 25. The length, width and thickness of the capsule 21 are 220cm, 60cm and 2cm, and the thickness of the high-pressure water bag 2 after being filled with water and pressurized is more than or equal to 40 mm. The water filling pressure of the high-pressure water bag 2 is 1.0-1.5 Mpa. The material of the bag body 21 is abrasion-resistant rubber, and the material of the transverse bridle 211 and the material of the longitudinal bridle 212 are both ethylene propylene diene monomer rubber.
A construction method of an underwater large-diameter shield continuous tunneling construction tool with a deformed tail shield comprises the following steps:
1) respectively installing a high-pressure water bag 2: and determining the central position of the connecting plate positioning hole 251 of the high-pressure water bag 2 according to the progress of the segment assembling process and the position requirement of installing the high-pressure water bag 2 on the inner wall of the tail shield shell 401. The exposed areas of the tail shield 40 are respectively drilled by a magnetic drilling machine, and then tapping or manual tapping is carried out, so that the threaded holes 402 on the inner wall of the tail shield shell 401 are machined one by one. Then, the fastening screws 26 are respectively threaded into the corresponding threaded holes 402 after passing through the connecting plate positioning holes 251 of the high-pressure water bag 2, so that the high-pressure water bag 2 is respectively fixed between the 2 guide bars 3 at the corresponding positions on the inner wall of the tail shield shell 401. Starting from the bottom of the inner wall of the tail shield shell 401, a plurality of high-pressure water bags 2 are longitudinally adjacently arranged in a ring shape surrounding the inner wall of the tail shield shell 401 for one circle, and the length of the high-pressure water bags 2 is matched with the width of a circle of segment rings 10 to be laid.
2) The high-pressure water sac unit 20 is connected with the water delivery unit 1: dividing a plurality of high-pressure water bags 2 on the periphery of the inner wall of the tail shield shell into a plurality of high-pressure water bag units 20 according to the vertical radial elevation of a shield 40, wherein each high-pressure water bag unit 20 comprises a plurality of high-pressure water bags 2, input water pipes 22 of the plurality of high-pressure water bags 2 are connected in parallel to form a whole-path total input pipe 23 and then fixedly connected with a quick connector 24, one end of a tail end hose 15 of a water delivery unit 1 is connected with the quick connector 24 at the end of the total input pipe 23 of the high-pressure water bag unit, and connection of the high-pressure water bag unit 20 and the water delivery unit 1 is completed.
3) Assembling a ring of pipe sheet rings 10: comprehensively evaluating the extension stroke, the shield posture and the shield tail clearance of the shield oil cylinder 20 and determining the splicing point position of the capping F pipe piece block in the tail shield 40. The installation method of assembling adjacent standard pipe piece blocks and adjacent pipe piece blocks in a staggered manner is adopted, as shown in figure 1, firstly, B3 standard block pipe pieces at the bottom of a circle of pipe piece rings 10 are assembled, then, B2 standard block pipe pieces and B4 standard block pipe pieces are assembled in a left-right crossing mode in sequence, B1 standard block pipe pieces, B5 standard block pipe pieces and L1 adjacent block pipe pieces and L2 adjacent block pipe pieces are assembled, a plurality of ring longitudinal seam connecting bolt and nut assemblies 5 of the adjacent pipe piece rings 10 are screwed in time in sequence, finally, top-sealed F pipe piece blocks are inserted in the axial direction of a tunnel, all the ring longitudinal seam connecting bolt and nut assemblies 5 are screwed in sequence finally, and the assembling of the circle of pipe piece rings 10 is completed.
4) Water injection pressurization high-pressure water bag unit 20: after the assembly of the ring of pipe sheet rings 10 is completed, as shown in fig. 3, the stop valves 22 of the high-pressure water bags 2 of the group of high-pressure water bag units 20 are respectively opened, and then the high-pressure water pumps 13 of the water delivery unit 1 are started to inject water into the high-pressure water bags 2 for pressurization, and the control is performed based on the reading of the pressure gauge 16. The water pressure of each group is based on the water and soil pressure outside the shield body at the elevation position of the high-pressure water bag 2, and in the pressurizing process, the tightening condition of the longitudinal seams of the ring longitudinal seam connecting bolt and nut assembly 5 and the segment ring 10 is observed, so that the water pressure of the high-pressure water bag 2 is adjusted correspondingly in time. After the water injection and pressurization are finished, the high-pressure water pump 13 is closed, then the stop valves 22 of the high-pressure water bags 2 are respectively closed, and finally the ring longitudinal seam connecting bolt and nut assembly 5 is tightened in time.
5) And (3) completing water injection and pressurization of the rest high-pressure water bag units 20 in the pipe sheet ring 10 in sequence: and (4) repeating the process of the step 4) in turn, and gradually completing the water injection and pressurization of the rest high-pressure water sac units 20 in the ring of pipe sheet rings 10.
6) Tunneling and monitoring of the shield: the shield adopts a sectional type tunneling mode, and the tunneling is divided into two stages according to the width of the segment ring 10, the tunneling depth of the first stage is 3/4 of the width of the segment ring 10, and the tunneling depth of the second stage is 1/4 of the width of the segment ring 10. In this embodiment, segment ring 10 is 200cm wide, with a first stage of 150cm tunnelling and a second stage of 50cm tunnelling. The first stage mainly controls the tunneling speed of the shield, the shield attitude is assisted, and the second stage mainly controls the shield attitude. In FIG. 5, the distance C from the inner wall of the tail shield shell 401 to the end face of the supporting shoe of the adjacent oil cylinder, namely the shield tail clearance is more than or equal to 40 mm. When the shield tunneling distance reaches about 180cm, the shield tail clearance C of each point position is measured in a full-circle mode according to the point position of the shield oil cylinder 20, and meanwhile the distance between the guide strips 3 in the plastic deformation area of the tail shield shell 401 is measured. And when the shield finishes 20-30 pipe sheet rings 10 every time the shield is tunneled, carrying out roundness measurement on the tail of the shield by using a total station, and carrying out roundness drawing on the tail of the shield based on a curve fitting principle of a least square method so as to master the deformation condition of the tail shield shell 401. According to the shield tail clearance C and the roundness change condition of the tail shield shell 401, the segment block 101 assembling sequence of the segment ring 10 is reasonably selected, and the water pressure of the high-pressure water bag 2 corresponding to the region is reasonably adjusted according to the deformation of different positions of the ring surface of the tail shield shell 401, so that the segment block 101 in the region cannot be extruded by the deformed tail shield shell 401, and the shield can be guaranteed to normally tunnel. The shield tunneling speed is 25-35 mm/min.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.
Claims (6)
1. The deformed underwater large-diameter shield continuous tunneling construction tool is characterized by comprising a water delivery unit, a plurality of high-pressure water bags and a plurality of guide strips, wherein the guide strips are uniformly distributed along the radial direction of the inner wall of a tail shield shell and are respectively fixed on the inner wall of the tail shield shell; the high-pressure water bag is positioned between the two guide strips, is respectively fixed on the inner wall of the tail shield shell and is positioned between the inner wall of the tail shield shell and the outer peripheral surface of the segment ring; the water delivery unit is including the industry water tank, input water pipe, high pressure water pump, delivery pipe and the terminal hose of connecting in order, and the manometer is other to be connected on delivery pipe, and the industry water tank is located the shield and constructs, is equipped with the stop valve in the high pressure water pocket input water pipe respectively, and the total input water pipe is all the way to the parallelly connected assembly of several high pressure water pocket input water pipes, total input water pipe one end and quick-operation joint fixed connection, the terminal hose one end of water delivery unit loops through quick-operation joint, total input water pipe, high pressure water pocket input water pipe and links to each other with several high pressure water pocket.
2. The under water major diameter shield that tail shield has warp keeps driving construction frock of claim 1, characterized in that, high-pressure water pocket includes utricule, several horizontal bridles and a vertical bridle, and several horizontal bridles that the interval set up are respectively around the utricule transversely a week, and a vertical bridle is around utricule longitudinal center a week, horizontal bridle and vertical bridle are the bonding respectively and are fixed on the utricule, and high-pressure water pocket one end and both sides are the interval respectively and are equipped with the connecting plate, and high-pressure water pocket passes through the fastening screw of connecting plate to be fixed on tail shield casing inner wall.
3. The tool for the continuous tunneling construction of the underwater large-diameter shield with the deformed tail shield according to claim 1, wherein the water filling pressure of the high-pressure water bag is 1.0-1.5 Mpa, and the thickness of the high-pressure water bag is more than or equal to 40mm after water filling and pressurization.
4. The deformed underwater large-diameter shield continuous tunneling construction tool of claim 2, wherein the capsule is made of wear-resistant rubber; the transverse bridle and the longitudinal bridle are both made of ethylene propylene diene monomer rubber.
5. A construction method using the deformed underwater large-diameter shield continuous tunneling construction tool for the tail shield of claim 1, characterized by comprising the following steps of:
1) respectively installing a high-pressure water bag: determining the position of the center of a positioning hole of a connecting plate of the high-pressure water bag according to the progress of the segment assembling process and the position requirement of installing the high-pressure water bag on the inner wall of the tail shield shell; respectively drilling holes in exposed areas of the tail shield by using a magnetic drilling machine, and then performing machine tapping or manual tapping to finish machining of threaded holes in the inner wall of the shell of the tail shield one by one; then, fastening screws respectively transversely penetrate through the connecting plate positioning holes of the high-pressure water bag and are screwed into the corresponding threaded holes, so that the high-pressure water bag is respectively fixed between 2 guide strips at the corresponding positions of the inner wall of the tail shield shell; starting from the bottom of the inner wall of the tail shield shell, a plurality of high-pressure water bags are longitudinally and adjacently arranged to form a ring around the inner wall of the tail shield shell, and the length of each high-pressure water bag is matched with the width of a circle of segment rings to be laid;
2) the high-pressure water sac unit is connected with the water delivery unit: dividing a plurality of high-pressure water bags on the periphery of the inner wall of a tail shield shell into a plurality of high-pressure water bag units according to the vertical radial elevation of a shield, wherein each high-pressure water bag unit comprises a plurality of high-pressure water bags, input water pipes of the plurality of high-pressure water bags are connected in parallel to form a main input pipe and then are fixedly connected with a quick connector, and one end of a tail end hose of each water delivery unit is connected with the quick connector at the end of the main input pipe of each high-pressure water bag unit respectively to complete the connection of the high-pressure water bag units and the water delivery units;
3) assembling a ring of pipe sheet rings: comprehensively evaluating the extension stroke, the shield posture and the shield tail clearance of a shield oil cylinder, and determining the splicing point position of a capping F pipe piece block in a tail shield; the method comprises the following steps of adopting an installation mode of assembling adjacent standard pipe piece blocks and adjacent pipe piece blocks in a staggered manner, firstly assembling B3 standard block pipe pieces at the bottom of a circle of pipe piece rings, then assembling the standard block pipe pieces and the adjacent pipe piece blocks in a left-right crossed manner, timely and sequentially screwing a plurality of ring longitudinal seam connecting bolt and nut assemblies of the adjacent pipe piece rings, finally inserting a top-sealed F pipe piece block along the axial direction of a tunnel, and sequentially and finally screwing all ring longitudinal seam connecting bolt and nut assemblies to finish the assembling of the circle of pipe piece rings;
4) water injection pressurization high-pressure water bag unit: after the assembly of a circle of segment rings is finished, firstly, respectively opening stop valves of all high-pressure water bags of a group of high-pressure water bag units, then starting a high-pressure water pump of a water delivery unit to inject water into all the high-pressure water bags for pressurization, and controlling by taking the reading of a pressure gauge as a standard; each group of water pressure is based on the water and soil pressure outside the shield body at the elevation position of the high-pressure water bag, and in the pressurizing process, the tightening condition of the ring longitudinal seam connecting bolt and nut assembly and the segment ring longitudinal seam is observed, so that the water pressure of the high-pressure water bag is adjusted correspondingly in time; after water injection and pressurization are finished, the high-pressure water pump is closed, then the stop valves of the high-pressure water bags are closed respectively, and finally the ring longitudinal joint connecting bolt and nut assembly is tightened in time;
5) and (3) completing water injection and pressurization of the rest high-pressure water sac units in the ring of the segment ring in sequence: repeating the process of the step 4), and gradually completing water injection and pressurization of the rest high-pressure water sac units in the ring of the segment;
6) shield tunneling and monitoring: the shield adopts a sectional type tunneling mode, and is tunneled in two stages according to the width of the segment ring, wherein the tunneling depth of the first stage is 3/4 of the width of the segment ring, and the tunneling depth of the second stage is 1/4 of the width of the segment ring; the first stage mainly controls the tunneling speed of the shield, the shield attitude is assisted, and the second stage mainly controls the shield attitude; the distance C from the inner wall of the tail shield shell to the end face of the oil cylinder supporting shoe, namely the shield tail clearance is more than or equal to 40 mm; when the shield tunneling distance reaches 175-185 cm, performing full-circle measurement on shield tail gaps of all point positions according to the point positions of the shield oil cylinder, and measuring the distance between guide strips of a plastic deformation area of a tail shield shell; when the shield finishes 20-30 pipe sheet rings every time the shield is tunneled, a total station is adopted to measure the roundness of the shield tail, and the roundness of the shield tail is drawn based on the curve fitting principle of the least square method, so that the deformation condition of the tail shield shell is mastered; according to the shield tail clearance and the roundness change condition of the tail shield shell, the assembling sequence of the duct piece blocks of the duct piece ring is reasonably selected, and the water pressure of the high-pressure water bag in the corresponding area is reasonably adjusted according to the deformation of different positions of the annular surface of the tail shield shell, so that the duct piece blocks in the area cannot be extruded by the deformed tail shield shell, and the shield can be ensured to normally tunnel.
6. The construction method of the tail shield deformed underwater large-diameter shield continuous tunneling construction tool according to claim 5, characterized in that the shield tunneling speed in the step 6) is 25-35 mm/min.
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| CN113446014B (en) | 2022-05-20 |
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