CN108729933B - Shear-resistant rotary spraying freezing blocking superposition structure for shield tunnel and construction method thereof - Google Patents
Shear-resistant rotary spraying freezing blocking superposition structure for shield tunnel and construction method thereof Download PDFInfo
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- CN108729933B CN108729933B CN201810650677.8A CN201810650677A CN108729933B CN 108729933 B CN108729933 B CN 108729933B CN 201810650677 A CN201810650677 A CN 201810650677A CN 108729933 B CN108729933 B CN 108729933B
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- 238000007710 freezing Methods 0.000 title claims abstract description 151
- 230000008014 freezing Effects 0.000 title claims abstract description 147
- 230000000903 blocking effect Effects 0.000 title claims abstract description 87
- 238000005507 spraying Methods 0.000 title claims abstract description 59
- 238000010276 construction Methods 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000004140 cleaning Methods 0.000 claims abstract description 20
- 238000010008 shearing Methods 0.000 claims abstract description 6
- 239000007921 spray Substances 0.000 claims description 34
- 239000002002 slurry Substances 0.000 claims description 28
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000008602 contraction Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 230000002787 reinforcement Effects 0.000 abstract description 3
- 239000011440 grout Substances 0.000 description 10
- 239000002689 soil Substances 0.000 description 9
- 238000005553 drilling Methods 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening 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
- 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
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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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- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a shear-resistant rotary spraying freezing blocking overlapping structure of a shield tunnel and a construction method thereof, wherein the shear-resistant rotary spraying freezing blocking overlapping structure of the shield tunnel comprises the following components: the rotary spraying blocking wall is arranged on the side of the intact duct piece, and the height of the rotary spraying blocking wall is not smaller than the inner diameter of the duct piece; the freezing blocking wall is also arranged on the side of the intact duct piece, the freezing blocking wall is overlapped with the jet grouting blocking wall and forms the jet grouting freezing blocking wall in the duct piece, and the shearing strength of the shearing-resistant jet grouting freezing blocking overlapped structure of the shield tunnel is higher; according to the construction method of the shear-resistant rotary spraying freezing plugging superposition structure of the shield tunnel, the freezing pipe with the double-layer pipe body structure is adopted, the grouting pipe is used for pre-grouting reinforcement of the freezing pipe, the operation is simple and convenient, stratum settlement after construction by the freezing method is better controlled, influence on construction environment is reduced, and meanwhile, water used for cleaning the grouting pipe is repeatedly recycled by matching with the grouting pipe cleaning device, so that pollution is reduced, and water resources are saved.
Description
Technical Field
The invention relates to the field of tunnel construction. More specifically, the invention relates to a shear-resistant rotary spraying freezing plugging superposition structure for a shield tunnel and a construction method thereof.
Background
Urban subways are greatly developed, convenience and rapidness are brought to urban development, and meanwhile, more and more safety problems are caused by construction of the urban subways. Because of the urban busy zone at the subway, surrounding buildings are densely distributed, underground pipelines are numerous, and once engineering accidents occur, great influence is generated, so that the method is widely focused. In recent years, relevant reports of shield tunnel construction collapse exist in Shanghai, hangzhou, nanjing, tianjin, guangzhou and other places.
The shield tunnel has larger burial depth, once the tunnel collapses, the repair difficulty is larger, the reliability of the tunnel plugging water stop structure is an important factor affecting the dredging safety of the later tunnel, and secondary accidents are easily caused due to poor treatment. Therefore, a structure and a method for constructing a shield tunnel shear-resistant rotary spraying freezing plugging superposition structure are needed to be designed, the safe and rapid progress of the dredging and repairing work of the tunnel is ensured, and the structure and the construction method have higher popularization and application values.
Disclosure of Invention
The invention aims to provide a shear-resistant rotary spraying freezing blocking superposed structure of a shield tunnel and a construction method thereof, wherein cavities possibly existing in a duct piece are filled through a rotary spraying blocking wall structure, basic conditions are created for freezing and reinforcing, then freezing and reinforcing are carried out in the rotary spraying blocking wall structure, the problem of water seepage of the blocking structure is solved, the main water and soil pressure is borne by a freezing wall when a subsequent tunnel is dredged, and the safety coefficient is high.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a shear-resistant rotary jetting freezing plugging lamination structure of a shield tunnel, comprising:
the rotary spraying blocking wall is arranged on the side of the intact duct piece, and the height of the rotary spraying blocking wall is not smaller than the inner diameter of the duct piece;
the freezing blocking wall is arranged on the side of the intact duct piece, the freezing blocking wall is overlapped with the rotary spraying blocking wall and forms the rotary spraying freezing blocking wall in the duct piece, the height of the freezing blocking wall is larger than that of the rotary spraying blocking wall, the longitudinal thickness of the freezing blocking wall along the tunnel is smaller than that of the rotary spraying blocking wall along the tunnel, and the circumferential width of the freezing blocking wall along the tunnel is larger than that of the rotary spraying blocking wall along the tunnel.
Preferably, the frozen blocking wall exceeds the outline of the arch crown and the arch bottom of the duct piece respectively by at least 2m in the height direction, and the frozen blocking wall exceeds the two sides of the duct piece respectively by at least 1m in the horizontal width direction along the circumferential direction of the tunnel.
The invention also provides a construction method of the shear-resistant rotary spraying freezing plugging superposition structure of the shield tunnel, which comprises the following steps:
s1: arranging jet grouting pile holes on the side of the intact duct piece, enabling the jet grouting pile holes to penetrate through the duct piece vault and the vault bottom, and performing jet grouting construction in the jet grouting pile holes to form a jet grouting blocking wall;
s2: and (3) arranging freezing holes inside the rotary spraying blocking wall and outside the horizontal width range of the rotary spraying blocking wall along the circumferential direction of the tunnel, wherein the center of a drilling hole of the freezing hole positioned in the rotary spraying blocking wall coincides with the center of a drilling hole of the rotary spraying pile hole, then driving freezing pipes into the freezing holes, wherein the longitudinal spacing of the freezing pipes along the tunnel is not more than 1.2m, the row spacing along the circumferential direction of the tunnel is not more than 1.4m, and freezing construction is carried out to form the freezing blocking wall, so that the freezing blocking wall and the rotary spraying blocking wall are overlapped to form the rotary spraying freezing blocking wall.
Preferably, the freezing pipe comprises a freezing pipe, a slurry outlet pipe and a drill bit, wherein the slurry outlet pipe is sleeved outside the freezing pipe at intervals, the axes of the slurry outlet pipe and the slurry outlet pipe are coincident, one end of the slurry outlet pipe and an opening of the freezing pipe positioned at the same side are in sealing connection through a bottom surface, the drill bit is of a conical structure and is connected with the bottom surface, a conical cavity is formed between the drill bit and the bottom surface, a plurality of slurry through holes are formed in the bottom surface along the circumferential direction so as to communicate the cavity between the outer wall of the freezing pipe and the inner wall of the slurry outlet pipe with the conical cavity, a plurality of slurry outlet holes are further formed in the slurry outlet pipe, and a plurality of slots are further formed in the drill bit;
the outer wall of the freezing pipe is spirally wound with a grouting pipe, one end of the grouting pipe is close to the bottom surface of the freezing pipe, and the other end of the grouting pipe extends out of the freezing pipe.
Preferably, after the freezing holes are arranged, freezing pipes are driven into the freezing holes, and the following construction steps are further carried out before freezing construction: grouting is carried out on the grouting pipe, meanwhile, the grouting pipe is gradually pulled out of the freezing pipe, then freezing construction is carried out, and finally the grouting pipe is cleaned and stored through a grouting pipe cleaning device.
Preferably, the grouting pipe cleaning device comprises:
the top end of the filtering tank is open and is provided with two-stage stepped inner walls;
the filter frame is slidably sleeved on the inner wall of the upper part of the filter tank, a first filter plate is arranged at the bottom of the filter frame and provided with a first filter hole, a second filter plate is detachably arranged on the inner wall of the filter frame and provided with a second filter hole, and the aperture of the second filter hole is smaller than that of the first filter hole;
the spray head is provided with a cylindrical cavity formed by an inner wall, an outer wall and annular upper and lower surfaces, the cavity of the spray head is communicated with the cavity of the filter tank above the second filter plate through a water outlet pipeline, a plurality of water spray ports are circumferentially arranged on the inner wall of the spray head, the outer wall of the spray head is connected with one end of a water collecting pipeline, and the other end of the water collecting pipeline is communicated with the cavity of the lower part of the filter tank; one end of the grouting pipe penetrates through the center of the spray head and penetrates out of the side wall of the water collecting pipeline;
and the booster pump is arranged on the water outlet pipeline.
Preferably, the grouting pipe cleaning device further comprises a screw rod and a motor, the screw rod is vertically arranged on the outer wall of the filter tank, one end of the screw rod is in driving connection with a rotating shaft of the motor, a screw rod nut is sleeved on the screw rod, a slide way is formed along the downward opening of the top of the side wall of the filter tank, the screw rod nut is connected with the outer wall of the filter frame through a connecting block, and the connecting block penetrates through the slide way.
Preferably, a pair of grooves are formed in the opposite side walls of the second filter plate, a contraction limiting mechanism is arranged in each pair of grooves, and a pair of clamping grooves are formed in the opposite inner side walls of the filter frame;
the shrinkage stop gear includes a pair of spring, a pair of card post, a pair of pole setting, horizontal pole, corresponds in a pair of recess and is equipped with a pair of card post, the one end of card post is the free end, and the other end is connected with the spring with the groove tank bottom between the level, and the free end of a pair of card post corresponds embedded in a pair of draw-in groove, and the top of a pair of card post is vertical to be connected with a pair of pole setting, and the level is connected with the horizontal pole between a pair of pole setting.
Preferably, the grouting pipe cleaning device further comprises a pair of connecting rods, one ends of the connecting rods are free ends, the other ends of the connecting rods are respectively and horizontally connected with one of the cross rods, a pair of limiting blocks are arranged on the connecting rods in a spaced mode perpendicular to the length direction of the connecting rods, and the limiting blocks of the connecting rods can be clamped relatively to change the distance between the cross rods. The invention at least comprises the following
The beneficial effects are that:
1. according to the invention, cavities possibly existing in the duct piece are filled through the jet grouting pile structure, foundation conditions are created for freezing and reinforcing, then freezing and reinforcing are carried out in the jet grouting blocking wall structure, the problem of water seepage of the blocking structure is solved, and the freezing wall bears main water and soil pressure in the subsequent dredging process of the tunnel, so that the safety coefficient is high;
2. compared with the conventional gravity type blocking wall, the rotary spraying and freezing superposed structure adopted by the invention has higher shear strength, greatly reduces the thickness of the wall, improves the working efficiency and simultaneously reduces the difficulty of removing the blocking wall at the later stage;
3. the freezing pipe with the double-layer pipe body structure is adopted in the invention, the grouting pipe is used for pre-grouting reinforcement of the freezing pipe and an external soil body, the operation is simple and convenient, the stratum settlement after the construction by the freezing method is better controlled, and the influence on the construction environment is reduced;
4. the grouting pipe cleaning device can clean the grouting pipe extracted from the freezing pipe, repeatedly recycle water used for cleaning the grouting pipe, collect and recycle precipitated coarse aggregate, reduce pollution, save water resources, and has a simple structure and convenient use.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic plan view of a shear-resistant rotary jetting freezing plugging superposition structure for a shield tunnel;
FIG. 2 is a schematic view of the structure of section B-B of FIG. 1 in the present invention;
FIG. 3 is a schematic view of the structure of the section C-C of FIG. 1 according to the present invention;
FIG. 4 is a schematic view of a freezing pipe according to the present invention;
FIG. 5 is a schematic view of the structure of section A-A of FIG. 4 in the present invention;
FIG. 6 is a schematic structural view of a grouting pipe cleaning device according to the invention;
FIG. 7 is a schematic view of a spray head according to the present invention;
FIG. 8 is a schematic view of a retraction limiting mechanism according to the present invention;
fig. 9 is a top view of a second filter plate according to the invention.
Reference numerals illustrate:
1-a slurry outlet pipe; 2-freezing tube; 3-a drill bit; 4-grouting pipe; 5-a slurry outlet hole; 6-bottom surface; 7-slurry passing holes; 8-a filter tank; 9-a filter frame; 10-a second filter plate; 11-screw rod; 12-a screw nut; 13-an electric motor; 14-a water outlet pipeline; 15-a booster pump; 16-spray head; 17-a water collecting pipeline; 18-a guide roller; 19-water jet; 20-springs; 21-clamping columns; 22-standing bars; 23-cross bar; 24-clamping grooves; 25-connecting rod; 26-limiting blocks; 27-segment; 28-broken segment side; 29-perfect segment side; 30-freezing the wells; 31-jet grouting pile holes; 32-freezing the tube; 33-rotary spraying blocking wall; 34-freezing the blocking wall; and 35-rotary spraying to freeze the blocking wall.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It should be noted that, in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1-3, the present invention provides a shear-resistant rotary spraying freezing plugging superposition structure for a shield tunnel, comprising:
the rotary spraying blocking wall 33 is arranged on the side 29 of the perfect duct piece, and the height of the rotary spraying blocking wall 33 is not smaller than the inner diameter of the duct piece 27;
the freezing blocking wall 34 is arranged on the side 29 of the intact duct piece, the freezing blocking wall 34 is overlapped with the spin-spraying blocking wall 33 to form a spin-spraying freezing blocking wall 35 in the duct piece 27, the height of the freezing blocking wall 34 is larger than that of the spin-spraying blocking wall 33, the thickness of the freezing blocking wall 34 along the longitudinal direction of the tunnel is smaller than that of the spin-spraying blocking wall 33 along the longitudinal direction of the tunnel, and the width of the freezing blocking wall 34 along the circumferential direction of the tunnel is larger than that of the spin-spraying blocking wall 33 along the circumferential direction of the tunnel.
In the above technical solution, the L value is calculated according to the position of the breakage of the segment 27, and the calculation formula is l=f/pi R 2 ra, wherein F is the lateral pressure of water and soil, a is the friction coefficient between a plugging structure and a duct piece, R is the inner diameter of the duct piece, R is the volume weight of the plugging structure, the length of the spin-spray plugging wall 33 along the longitudinal direction of a tunnel is greater than or equal to L, the height of the spin-spray plugging wall 33 is not less than the inner diameter of the duct piece 27 so as to completely plug the damaged part of the tunnel duct piece 27, the spin-spray plugging wall 33 is arranged on the side 29 of the intact duct piece to bear the shearing force of the damaged duct piece side 28, the freezing plugging wall 34 is also arranged on the side 29 of the intact duct piece, the middle part of the freezing plugging wall 34 is overlapped with the middle part of the spin-spray plugging wall 33 to form a spin-spray freezing plugging wall 35, the spin-spray plugging wall 33 fills a cavity possibly existing in the duct piece 27, creates a basic condition for freezing and then carries out freezing and strengthening in the spin-spray plugging wall 33, the problem of water seepage of the plugging structure is solved, and the freezing plugging wall 34 bears the main water and soil pressure when the subsequent tunnel dredging, and the safety coefficient is higher; and the height of the frozen blocking wall 34 is greater than that of the rotary spraying blocking wall 33, the thickness of the frozen blocking wall 34 along the longitudinal direction of the tunnel is smaller than that of the rotary spraying blocking wall 33 along the longitudinal direction of the tunnel, and the width of the frozen blocking wall 34 along the circumferential direction of the tunnel is greater than that of the rotary spraying blocking wall 33 along the circumferential direction of the tunnel, so that a rotary spraying blocking wall 35 with higher shear strength and more reasonable structure is formed, the thickness of the wall body is greatly reduced compared with that of a conventional gravity blocking wall, the work efficiency is improved, and meanwhile, the difficulty of cleaning the blocking wall at the later stage is reduced.
In another technical scheme, the frozen blocking wall 34 respectively exceeds the vault and the arch bottom outline of the duct piece 27 by at least 2m in the height direction, and the frozen blocking wall 34 respectively exceeds the two sides of the duct piece 27 by at least 1m in the horizontal width direction along the tunnel annular direction, so that the tunnel duct piece 27 is completely wrapped in the frozen blocking wall 34, and the blocking structure is prevented from water seepage and damage.
The invention also provides a construction method of the shield tunnel shear-resistant rotary spraying freezing blocking superposition structure, which comprises the following steps:
s1: arranging jet grouting pile holes 31 on the side 29 of the intact duct piece, wherein the jet grouting pile holes 31 penetrate through the vault and the vault bottom of the duct piece 27, and jet grouting construction is performed in the jet grouting pile holes 31 to form a jet grouting wall 33;
s2: and (3) arranging freezing holes 30 inside the rotary spraying blocking wall 33 and outside the horizontal width range of the rotary spraying blocking wall 33 along the circumferential direction of the tunnel, wherein the center of a drilling hole of the freezing holes 30 positioned in the rotary spraying blocking wall 33 coincides with the center of a drilling hole of the rotary spraying pile hole 31, so that the construction difficulty is reduced, the construction efficiency is improved, then, freezing pipes 32 are driven into the freezing holes 30, the longitudinal spacing of the freezing pipes 32 along the tunnel is not more than 1.2m, the circumferential spacing of the freezing pipes along the tunnel is not more than 1.4m, freezing construction forms a freezing blocking wall 34, and the freezing blocking wall 34 and the rotary spraying blocking wall 33 are overlapped to form a rotary spraying freezing blocking wall 35.
As shown in fig. 4-5, in another technical scheme, the freezing pipe 32 includes a freezing pipe 2, a slurry outlet pipe 1 and a drill bit 3, the slurry outlet pipe 1 is sleeved outside the freezing pipe 2 at intervals and the axes of the two are coincident, one end of the slurry outlet pipe 1 and an opening of the freezing pipe 2 at the same side are in sealed connection through a bottom surface 6, the drill bit 3 is in a conical structure, is connected with the bottom surface 6 and forms a conical cavity with the bottom surface 6, a plurality of slurry through holes 7 are circumferentially arranged on the bottom surface 6 so as to communicate the cavity between the outer wall of the freezing pipe 2 and the inner wall of the slurry outlet pipe 1 with the conical cavity, a plurality of slurry outlet holes 5 are also arranged on the slurry outlet pipe 1, and a plurality of slits are also arranged on the drill bit 3;
the outer wall of the freezing pipe 2 is also spirally wound with a grouting pipe 4, one end of the grouting pipe 4 is close to the bottom surface 6 of the freezing pipe 32, and the other end extends out of the freezing pipe 32.
In the above technical solution, the freezing pipe 32 is in a structure of a double-layer pipe body, the inner layer freezing pipe 2 and the grout outlet pipe 1 are connected through the bottom surface 6 in a supporting manner, and the grouting pipe 4 is spirally wound between the freezing pipe 2 and the grout outlet pipe 1, when the grouting pipe 4 is used for grouting the freezing pipe 32, mortar can flow out from the grout outlet holes 5 on the grout outlet pipe 1, the outer wall of the freezing pipe 32 is combined with surrounding soil, the mortar can also enter into the conical cavity of the drill bit 3 through the grout through holes 7 on the bottom surface 6 and flow out from the cutting slits on the drill bit 3, so that the end part of the freezing pipe 32 is firmly combined with the soil at the bottom of the freezing hole 30, and the cavity in the center of the freezing pipe 2 can be filled with cold liquid to freeze the surrounding soil, preferably, the grout through holes 7 are uniformly distributed on the outer wall of the grout outlet pipe 1 in the circumferential direction along the length direction of the freezing pipe 32, the grout through holes 7 are uniformly distributed along the circumferential direction of the bottom surface 6, the grout through holes are uniformly distributed along the circumferential direction of the drill bit 3, and the grout through holes 4 are uniformly distributed along the circumferential direction of the spiral pipe 32; the freezing pipe 32 is utilized to perform freezing construction steps, namely, firstly, a drilling machine is used for positioning holes according to the arrangement requirement of the freezing holes 30, then the holes are drilled into the freezing pipe 32, the grouting pipe 4 is utilized to perform pre-grouting, the freezing pipe 32 is firmly combined with surrounding soil, finally, cold liquid is introduced into the freezing pipe 2, freezing construction is performed to form the freezing blocking wall 34, wherein in the pre-grouting process, the grouting pipe 4 is gradually pulled out of the freezing pipe 32 while grouting the grouting pipe 4, so that mortar in the grouting pipe 4 is gradually and completely filled in a cavity between the freezing pipe 2 and the grouting pipe 1 from the bottom to the top of the freezing pipe 32, stratum settlement after the freezing method construction can be better controlled through pre-grouting reinforcement, influence on construction environment is reduced, and operation is simple and convenient.
In another technical scheme, after the freezing holes 30 are arranged, the freezing pipes 32 are driven into the freezing holes 30, and the following construction steps are further carried out before freezing construction: grouting is performed on the grouting pipe 4, meanwhile, the grouting pipe 4 is gradually pulled out of the freezing pipe 32, freezing construction is performed, and finally the grouting pipe 4 is cleaned and stored through a grouting pipe 4 cleaning device.
As shown in fig. 6 to 9, in another embodiment, the grouting pipe cleaning device includes:
a filter tank 8 with an open top end and two-stage stepped inner walls;
the filter frame 9 is slidably sleeved on the inner wall of the upper part of the filter tank 8, a first filter plate is arranged at the bottom of the filter frame 9 and is provided with a first filter hole, a second filter plate 10 is detachably arranged on the inner wall of the filter frame 9, the second filter plate 10 is provided with a second filter hole, and the aperture of the second filter hole is smaller than that of the first filter hole;
a spray head 16 having a cylindrical cavity formed by an inner wall, an outer wall and annular upper and lower surfaces, wherein the cavity of the spray head 16 is communicated with the cavity of the filter tank 8 above the second filter plate 10 through a water outlet pipe 14, a plurality of water spray ports 19 are circumferentially arranged on the inner wall of the spray head 16, the outer wall of the spray head 16 is connected with one end of a water collecting pipe 17, and the other end of the water collecting pipe 17 is communicated with the cavity of the lower part of the filter tank 8; one end of the grouting pipe 4 passes through the center of the spray head 16 and passes out of the side wall of the water collecting pipeline 17;
and a booster pump 15 provided in the water outlet pipe 14.
In the above technical solution, after the grouting pipe 4 is drawn out from the freezing pipe 32, the grouting pipe 4 is cleaned by the grouting pipe cleaning device, the grouting pipe cleaning device includes a filter tank 8, a filter frame 9, a spray head 16, and a booster pump 15, the filter frame 9 is sleeved in the filter tank 8 and supports and fixes the bottom of the filter frame 9 by the stepped inner wall of the filter tank 8, a first filter plate is arranged at the bottom of the filter frame 9, a second filter plate 10 is sleeved at the upper part of the first filter plate, the first filter plate and the second filter plate 10 double-filter cleaning water in the filter tank 8, and filtered solid particles are precipitated at the bottom of the filter tank 8; the booster pump 15 pumps out the filtered water from the upper part of the second filter plate 10 and leads the filtered water into the cylindrical cavity of the spray head 16 through the water outlet pipeline 14, preferably, the inner wall of the spray head 16 is uniformly provided with a plurality of circles of water spray ports 19 along the circumferential direction, when the grouting pipe 4 passes through the pore canal in the center of the spray head 16, the water sprayed out of the water spray ports 19 can uniformly flush the outer wall of the grouting pipe 4, the flushed water with mortar enters the filter tank 8 at the lower part of the filter frame 9 through the water collecting pipeline 17 at the lower part of the spray head 16, a cycle process of filtering and flushing is completed, the flushed grouting pipe 4 is pumped out from the opening at the side wall of the water collecting pipeline 17 and is stored, the water used for cleaning the grouting pipe can be repeatedly recycled, and the precipitated coarse aggregate can be collected and reused, pollution is reduced, and water resources are saved; preferably, a guide roller 18 is further arranged at the upper part of the nozzle 16, and the grouting pipe 4 passes through a hole in the center of the nozzle 16 through the guide roller 18, so that friction with the inner wall of the nozzle 16 is avoided.
In another technical scheme, the grouting pipe cleaning device further comprises a screw rod 11 and a motor 13, wherein the screw rod 11 is vertically arranged on the outer wall of the filter tank 8, one end of the screw rod 11 is in driving connection with a rotating shaft of the motor 13, a screw rod nut 12 is sleeved on the screw rod 11, the side wall of the filter tank 8 is opened downwards along the top to form a slide way, the screw rod nut 12 is connected with the outer wall of the filter frame 9 through a connecting block, and the connecting block penetrates through the slide way; the motor 13, the screw rod 11 and the screw rod nut 12 together form an automatic lifting mechanism, the side wall of the upper part of the filter tank 8 forms a through slideway along the downward opening of the top, and as a connecting block penetrating through the slideway is connected between the screw rod nut 12 and the outer wall of the filter frame 9, the automatic lifting mechanism can drive the filter frame 9 to lift, so that the filter frame 9 is taken out from the filter tank 8 or sleeved in, and the filter tank 8 is cleaned conveniently and the filter frame 9 is cleaned.
In another technical scheme, a pair of grooves are formed in the opposite side walls of the second filter plate 10, a contraction limiting mechanism is arranged in the pair of grooves, a pair of clamping grooves 24 are formed in the opposite inner side walls of the filter frame 9, and the second filter plate 10 is connected into the clamping grooves 24 of the filter frame 9 through the pair of contraction limiting mechanisms;
the shrinkage stop gear includes a pair of spring 20, a pair of card post 21, a pair of pole setting 22, horizontal pole 23, and the level is equipped with a pair of card post 21 in a pair of recess, the one end of card post 21 is the free end, and the level is connected with spring 20 between the other end and the recess tank bottom, and the free end of a pair of card post 21 corresponds the embedment in a pair of draw-in groove 24, and the top of a pair of card post 21 is vertical to be connected with a pair of pole setting 22, and the level is connected with horizontal pole 23 between a pair of pole setting 22.
In the above technical solution, the second filter plate 10 is connected to the clamping groove 24 of the filter frame 9 through a pair of shrinkage limiting mechanisms, when the cross bar 23 of the shrinkage limiting mechanisms is pulled toward the center direction of the second filter plate 10, the pair of upright bars 22 connected to the lower part of the cross bar 23 can drive the pair of clamping columns 21 to move toward the center direction of the second filter plate 10, and simultaneously, the springs 20 connected between the pair of clamping columns 21 and the grooves of the second filter plate 10 are compressed, and the clamping columns 21 are separated from the clamping groove 24 of the filter frame 9, so that the second filter plate 10 is taken out from the filter frame 9, and the filter frame 9 is disassembled and cleaned; the second filter plate 10 may instead be mounted into the filter frame 9 by a pair of retraction limiting mechanisms.
In another technical scheme, the device further comprises a pair of connecting rods 25, wherein one ends of the connecting rods 25 are free ends, the other ends of the connecting rods 25 are respectively and horizontally connected with one of the cross rods 23, a pair of limiting blocks 26 are arranged on the connecting rods 25 at intervals perpendicular to the length direction of the connecting rods, and the limiting blocks 26 of the connecting rods 25 can be relatively clamped to change the distance between the cross rods 23; in this technical scheme, after the clamping between the stopper 26 that is close to each other on a pair of connecting rods 25, the position of a pair of connecting rods 25 is relatively fixed, and the length after the clamping is longest this moment, and the distance between a pair of horizontal poles 23 is furthest, the spring 20 of shrink stop gear is all uncompressed, second filter plate 10 is fixed in filter frame 9, after the clamping state between the stopper 26 on a pair of connecting rods 25 is changed, make the clamping between the stopper 26 that the distance is farther, the distance between a pair of horizontal poles 23 is closest, the spring 20 of shrink stop gear is all compressed, second filter plate 10 breaks away from in the filter frame 9, can carry out more convenient dismantlement and installation through the stopper 26 that sets up on a pair of connecting rods 25 and the connecting rod 25.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (5)
1. The construction method of the shear-resistant rotary spraying and freezing blocking superposed structure of the shield tunnel is characterized by comprising the following steps of:
s1: arranging jet grouting pile holes on the side of the intact duct piece, enabling the jet grouting pile holes to penetrate through the duct piece vault and the vault bottom, and performing jet grouting construction in the jet grouting pile holes to form a jet grouting blocking wall;
s2: setting freezing holes inside the rotary spraying blocking wall and outside the horizontal width range of the rotary spraying blocking wall along the circumferential direction of the tunnel, wherein the circle centers of the holes of the freezing holes in the rotary spraying blocking wall are overlapped with the circle centers of the holes of the rotary spraying piles, then driving freezing pipes into the freezing holes, wherein the longitudinal spacing of the freezing pipes along the tunnel is not more than 1.2m, the row spacing along the circumferential direction of the tunnel is not more than 1.4m, and freezing construction is carried out to form the freezing blocking wall, so that the freezing blocking wall and the rotary spraying blocking wall are overlapped to form the rotary spraying freezing blocking wall;
after the freezing holes are arranged, the freezing pipes are driven into the freezing holes, and the following construction steps are carried out before freezing construction: grouting the grouting pipe, gradually extracting the grouting pipe from the freezing pipe, freezing, and finally cleaning and storing the grouting pipe by using a grouting pipe cleaning device;
the grouting pipe cleaning device comprises:
the top end of the filtering tank is open and is provided with two-stage stepped inner walls;
the filter frame is slidably sleeved on the inner wall of the upper part of the filter tank, a first filter plate is arranged at the bottom of the filter frame and provided with a first filter hole, a second filter plate is detachably arranged on the inner wall of the filter frame and provided with a second filter hole, and the aperture of the second filter hole is smaller than that of the first filter hole;
the spray head is provided with a cylindrical cavity formed by an inner wall, an outer wall and annular upper and lower surfaces, the cavity of the spray head is communicated with the cavity of the filter tank above the second filter plate through a water outlet pipeline, a plurality of water spray ports are circumferentially arranged on the inner wall of the spray head, the outer wall of the spray head is connected with one end of a water collecting pipeline, and the other end of the water collecting pipeline is communicated with the cavity of the lower part of the filter tank; one end of the grouting pipe penetrates through the center of the spray head and penetrates out of the side wall of the water collecting pipeline;
and the booster pump is arranged on the water outlet pipeline.
2. The construction method of the shield tunnel shear-resistant rotary spraying freezing plugging superposition structure according to claim 1, wherein the freezing pipe comprises a freezing pipe, a slurry outlet pipe and a drill bit, the slurry outlet pipe is sleeved outside the freezing pipe at intervals, the axes of the slurry outlet pipe and the slurry outlet pipe are coincident, one end of the slurry outlet pipe and an opening of the freezing pipe positioned on the same side are in sealing connection through a bottom surface, the drill bit is of a conical structure, is connected with the bottom surface and forms a conical cavity with the bottom surface, a plurality of slurry through holes are formed in the bottom surface along the circumferential direction so as to communicate the cavity between the outer wall of the freezing pipe and the inner wall of the slurry outlet pipe with the conical cavity, a plurality of slurry outlet holes are further formed in the slurry outlet pipe, and a plurality of cutting seams are further formed in the drill bit;
the outer wall of the freezing pipe is spirally wound with a grouting pipe, one end of the grouting pipe is close to the bottom surface of the freezing pipe, and the other end of the grouting pipe extends out of the freezing pipe.
3. The construction method of the shield tunnel shearing-resistant rotary spraying freezing plugging superposition structure according to claim 1, further comprising a screw rod and a motor, wherein the screw rod is vertically arranged on the outer wall of the filter tank, one end of the screw rod is in driving connection with a rotating shaft of the motor, a screw rod nut is sleeved on the screw rod, the side wall of the filter tank is opened downwards along the top to form a slide way, the screw rod nut is connected with the outer wall of the filter frame through a connecting block, and the connecting block penetrates through the slide way.
4. The construction method of the shield tunnel shearing-resistant rotary spraying freezing plugging superposition structure according to claim 1, and is characterized in that a pair of grooves are formed in the opposite side walls of the second filter plate, a contraction limiting mechanism is arranged in the pair of grooves, and a pair of clamping grooves are formed in the opposite inner side walls of the filter frame;
the shrinkage stop gear includes a pair of spring, a pair of card post, a pair of pole setting, horizontal pole, corresponds in a pair of recess and is equipped with a pair of card post, the one end of card post is the free end, and the other end is connected with the spring with the groove tank bottom between the level, and the free end of a pair of card post corresponds embedded in a pair of draw-in groove, and the top of a pair of card post is vertical to be connected with a pair of pole setting, and the level is connected with the horizontal pole between a pair of pole setting.
5. The construction method of the shield tunnel shearing-resistant rotary spraying freezing plugging superposition structure according to claim 4, further comprising a pair of connecting rods, wherein one ends of the connecting rods are free ends, the other ends of the connecting rods are respectively and horizontally connected with one of the cross rods, a pair of limiting blocks are arranged on the connecting rods at intervals perpendicular to the length direction of the connecting rods, and the limiting blocks of the connecting rods can be relatively clamped to change the distance between the cross rods.
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| CN201810650677.8A CN108729933B (en) | 2018-06-22 | 2018-06-22 | Shear-resistant rotary spraying freezing blocking superposition structure for shield tunnel and construction method thereof |
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| CN111396079B (en) * | 2019-04-23 | 2021-12-21 | 中国建筑股份有限公司 | Superposed assembly type tunnel secondary lining structure and construction method thereof |
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| CN108729933A (en) | 2018-11-02 |
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