CN113236263A - Construction method of open type TBM front-mounted type advanced pipe shed - Google Patents
Construction method of open type TBM front-mounted type advanced pipe shed Download PDFInfo
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- CN113236263A CN113236263A CN202110710340.3A CN202110710340A CN113236263A CN 113236263 A CN113236263 A CN 113236263A CN 202110710340 A CN202110710340 A CN 202110710340A CN 113236263 A CN113236263 A CN 113236263A
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- 239000011440 grout Substances 0.000 claims abstract description 31
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000005553 drilling Methods 0.000 claims description 13
- 239000003365 glass fiber Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 238000007596 consolidation process Methods 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 7
- 239000011435 rock Substances 0.000 claims description 7
- 238000009412 basement excavation Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 230000005641 tunneling Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 13
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 3
- 101150006257 rig-4 gene Proteins 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- NMFHJNAPXOMSRX-PUPDPRJKSA-N [(1r)-3-(3,4-dimethoxyphenyl)-1-[3-(2-morpholin-4-ylethoxy)phenyl]propyl] (2s)-1-[(2s)-2-(3,4,5-trimethoxyphenyl)butanoyl]piperidine-2-carboxylate Chemical compound C([C@@H](OC(=O)[C@@H]1CCCCN1C(=O)[C@@H](CC)C=1C=C(OC)C(OC)=C(OC)C=1)C=1C=C(OCCN2CCOCC2)C=CC=1)CC1=CC=C(OC)C(OC)=C1 NMFHJNAPXOMSRX-PUPDPRJKSA-N 0.000 description 1
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- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
- E21D9/087—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
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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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
-
- 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
- E21D9/04—Driving tunnels or galleries through loose materials; Apparatus therefor not otherwise provided for
-
- 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
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/065—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end with devices for provisionally supporting the front face
-
- 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
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
- E21D9/087—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
- E21D9/0873—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines 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)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a construction method of an open TBM front-mounted type advanced pipe shed, which comprises the following steps: 1) applying a hollow anchor rod for grouting, and reinforcing the side arch of the shield and the cutter head region; 2) conducting guide hole construction; 3) arranging an advanced pipe shed; 4) backfilling a gap between the pipe shed and the guide hole by grouting; 5) installing an exhaust pipe and a grout stop plug; 6) and grouting the pipe shed. The method has the advantages of convenient construction, simple process and low cost, ensures the success of the pipe shed, the effective coverage area of the pipe shed and the grouting effect of the pipe shed to the greatest extent, can ensure that the TBM quickly and safely passes through the fault fracture zone, effectively solves the problem of blocking, improves the construction efficiency and reduces the construction cost.
Description
Technical Field
The invention relates to a TBM construction method, in particular to an open TBM front-mounted type advanced pipe shed construction method.
Background
At present, when an open type TBM is used for tunnel (tunnel) excavation, once unfavorable geology such as surrounding rock weathering, erosion, fault fracture zone and the like is met, the TBM is easy to cause blocking, the TBM construction efficiency is seriously influenced, the construction period is delayed, and the resource waste of people, materials, machines and the like is caused, so that great loss is caused.
The invention discloses an invention patent application named 'a novel TBM with pipe shed construction capacity and a construction method thereof' in CN107435541A, which comprises the TBM, a pipe shed drilling machine and an annular track, wherein the pipe shed drilling machine is arranged on a drilling machine supporting seat, and a pitching oil cylinder and a pushing oil cylinder are arranged at the lower part of the drilling machine supporting seat; the annular rail is sleeved on a main girder of the TBM, and the drilling machine supporting seat is connected with the annular rail through the pitching oil cylinder and the pushing oil cylinder. The construction method is stated in claim 6 of the invention patent application: the method comprises the following steps: firstly, when a tunnel is excavated, excavating an area to be excavated in a self-stable rock stratum by adopting a TBM cutter head; secondly, when a region of the unstable rock-soil layer is encountered in the process of excavating the tunnel by adopting the TBM, drilling the unstable rock-soil layer by adopting a pipe shed drilling machine and supporting by adopting a pipe shed; and thirdly, continuously excavating the pipe shed supporting area by using the TBM after the pipe shed supporting is finished. Although the novel TBM related to the method has the capacity of constructing the pipe shed, the pipe shed is constructed only on the outer side of the shield of the TBM, the camber angle of the pipe shed is large, the effective grouting range of a pipe shed supporting area is small, the material waste is caused, and the pipe shed effect is poor.
An invention patent application entitled "an open TBM shield" is disclosed in CN111287761A and includes a shield, a first conduit, a second conduit, a sealing member; the first guide pipe is sleeved and fixed in a pilot hole of the shield, and a preset external inserting angle is formed between the axial direction of the first guide pipe and the axial direction of the shield; the second guide pipe is connected with the first guide pipe when advancing the shed support so as to form a long straight pipe structure for a drill rod of the shed drilling machine system to pass through with the first guide pipe, and the end part of the second guide pipe extends to the slag collecting area of the main beam; the sealing component is used for replacing the second conduit to be connected with the first conduit during tunneling so as to seal the first conduit; the second conduit and the sealing component are respectively detachably connected with the first conduit. Patent claim 4 of the present patent application explicitly states that: the preset external insertion angle is 6 degrees. The application of the invention makes up the defects of the previous patent, but the camber angle is still large, the construction length of the advanced pipe shed is greatly shortened in the actual construction, and the patent fails to research the construction method of the pipe shed under the TBM shield.
The invention discloses a shield structure of an open TBM (tunnel boring machine) and an advanced reinforcement construction method in CN110939452A, which is an application and comprises an upper preformed hole arranged on a top shield of the open TBM, side preformed holes which are arranged on two side shields of the open TBM and symmetrically distributed, and a lower preformed hole arranged on a bottom support of the open TBM, wherein seamless steel pipes are arranged in the side preformed holes and the lower preformed holes in an inclined mode, and the method comprises the following steps: firstly, laying a reserved hole in an open type TBM shield; secondly, installing a seamless steel pipe; thirdly, installing a plug; and fourthly, performing advanced grouting reinforcement in the TBM tunneling process. Compared with the first patent, the method describes that the pipe shed construction is carried out in the shield structure, but the aim of carrying out the pipe shed construction in the shield of the TBM, grouting to reinforce surrounding rocks in front of the TBM and then carrying out tunneling construction is not really achieved only by grouting the pipe shed after the TBM is tunneled.
Disclosure of Invention
The invention aims to provide a construction method of an open type TBM front-mounted type advanced pipe shed, which has high construction efficiency and enables a TBM to quickly pass through a fault fracture zone.
The invention aims to realize the technical scheme that the construction method of the open TBM front-mounted type advanced pipe shed comprises the following steps: 1) applying a hollow anchor rod for grouting, and reinforcing the side arch of the shield and the cutter head region; 2) conducting guide hole construction; 3) arranging an advanced pipe shed; 4) backfilling a gap between the pipe shed and the guide hole by grouting; 5) installing an exhaust pipe and a grout stop plug; 6) and grouting the pipe shed.
In the step 1), a hollow anchor rod is respectively constructed in the tail part of the shield and the cutter head, and the hollow anchor rod is used for grouting and solidifying to form the annular grout stopping wall.
Further describing, in the step 1), a hollow anchor rod with the diameter of 30mm is constructed from the tail of the shield along the direction of a camber angle, the construction range is 150 degrees, the rock-entering depth is 3m, and the annular interval is 1 m; a glass fiber hollow anchor rod with the diameter of 30mm is radially constructed in a cutter head, the construction range is 150 degrees, the rock-entering depth is 0.5-1.5 m, and the annular distance is 1 m; wherein, resin double-liquid slurry is poured into the side arch through the hollow anchor rod and the glass fiber hollow anchor rod for consolidation and reinforcement.
In order to effectively avoid the invasion of the advanced pipe shed into an excavation contour line, in the step 2), the advanced pipe shed drilling machine moves forwards to a pipe shed construction position, the camber angle of the drilling machine is adjusted to be 4-5 degrees, a core taking drill bit and a core taking pipe are installed, a drill rod is connected to a rock entering position, the core taking length is 1m, and a guide hole is formed after the core taking is completed.
Further describing, in the step 3), the coring bit is withdrawn, the down-the-hole bit is replaced, and the tail end of the pipe shed is positioned outside the excavation contour line of the tunnel; and no grout overflow hole is reserved at the position 4.5-4.8 m away from one end of the TBM cutter head of the pipe shed.
In order to prevent slurry from flowing back during grouting of the pipe shed, in the step 4), a steel pipe with the diameter of 10mm is inserted into a gap between the pipe shed and the hole wall through a gap filling tool, the front end of the steel pipe exceeds the tail end of the pipe shed by 1-1.2 m, resin double-slurry is poured into the steel pipe to plug the gap, and the steel pipe retreats while being poured.
Further describing, in the step 5), a PVC exhaust pipe with the diameter of 20mm is connected with an exhaust hole of the three-hole grout stopping plug, and the total length of the PVC exhaust pipe and the three-hole grout stopping plug is slightly shorter than the length of the pipe shed; the PVC exhaust pipe and the grout stop plug are inserted into the pipe shed together according to the design position, water is injected through the water injection hole of the grout stop plug and the pressure is increased to 1MPa, and the grout stop plug is confirmed to be fully expanded at the tail of the sleeve of the pipe shed.
In order to effectively reinforce the front weak surrounding rock, in the step 6), cement-based variable-speed setting materials are injected through the hollow anchor rods for grouting, the grout stop plugs are decompressed and removed after grouting is completed, the guide pipe plugs are installed, and TBM tunneling construction is recovered.
By adopting the technical scheme, the method has the advantages of convenience and quickness in construction, simple process and low cost, the success of the pipe shed, the effective coverage area of the pipe shed and the grouting effect of the pipe shed are guaranteed to the greatest extent, the TBM can quickly and safely pass through a fault fracture zone, the problem of blocking is effectively solved, the construction efficiency is improved, and the construction cost is reduced.
Drawings
The drawings of the invention are illustrated as follows:
FIG. 1 is a schematic structural diagram of an open type TBM shield and forepoling rig of the present invention;
FIG. 2 is a schematic view of the outer side of the shield of the present invention applied with a hollow anchor rod;
FIG. 3 is a schematic view of a cutterhead contour of the present invention applied as a fiberglass bolt;
FIG. 4 is a schematic view of the structure of the caulking tool of the present invention;
FIG. 5 is a schematic view of the pipe shed construction of the present invention;
FIG. 6 is a schematic view of the orifice plugging of the present invention;
fig. 7 is a schematic view of grouting of the pipe shed according to the invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments will still fall within the scope of the present invention claimed in the claims.
Example 1: as shown in fig. 1 to 7, a construction method of an open type TBM front-mounted type advanced pipe shed includes the following steps: 1) applying a hollow anchor rod 7 for grouting, and reinforcing the side arch of the shield 1 and the cutter head 2; 2) conducting guide hole construction; 3) arranging an advanced pipe shed 9; 4) backfilling a gap between the pipe shed 9 and the guide hole by grouting; 5) installing an exhaust pipe 11 and a grout stop plug 10; 6) grouting the pipe shed 9.
In the step 1), a hollow anchor rod 7 is respectively applied from the tail of the shield and the inside of the cutter head 2, and the hollow anchor rod 7 is used for grouting and consolidation to form the annular grout stop wall.
Further describing, in the step 1), a hollow anchor rod 7 with the diameter of 30mm is constructed from the tail of the shield along the direction of a camber angle, the construction range is 150 degrees at the vault, the rock-entering depth is 3m, and the annular interval is 1 m; a glass fiber hollow anchor rod 8 with the diameter of 30mm is radially constructed in a cutter head 2, the construction range is 150 degrees, the rock-entering depth is 0.5-1.5 m, and the annular distance is 1 m; wherein, resin double-liquid slurry is poured into the side top arch through the hollow anchor rod 7 and the glass fiber hollow anchor rod 8 for consolidation and reinforcement.
Advance shed stand pipe 3 by shield 2 inboard reservation core trompil, can effectively avoid advancing shed 9 to invade the excavation outline line like this in step 2), advance shed rig 4 moves forward to shed 9 and carries out the position, and 4 degrees positions at the adjustment rig 4 camber angle are installed and are got core bit 12, core pipe, and the drilling rod that continues to the position of going into the rock, and core length 1m gets the core and finishes the back, forms the guiding hole promptly.
Further, in the step 3), the lead pipe shed 9 is designed, and the method is carried out as follows: the coring bit 12 is withdrawn, the down-the-hole bit is replaced, and the tail end of the pipe shed 9 is positioned outside the tunnel excavation contour line; no grout overflow hole is reserved at the position 4.5m away from one end of the TBM cutter head of the pipe shed 9, and the grout overflow hole is reserved at the end far away from the TBM cutter head.
In order to effectively prevent slurry from flowing back when the pipe shed 9 is grouted, in the step 4), a steel pipe 14 with the diameter of 10mm is inserted into a gap between the pipe shed 9 and the hole wall through a gap filling tool 13, the front end of the steel pipe 14 exceeds the tail end of the pipe shed 9 by 1-1.2 m, resin double-slurry is poured into the steel pipe 14 to plug the gap, and the steel pipe 14 is poured while retreating.
Further describing, in the step 5), a PVC exhaust pipe 11 with the diameter of 20mm is connected with an exhaust hole of the three-hole grout stopping plug 10, and the total length of the PVC exhaust pipe 11 and the three-hole grout stopping plug 10 is slightly shorter than the length of the pipe shed 9; the PVC exhaust pipe 11 and the grout stop plug 10 are inserted into the pipe shed 9 together according to the design position, water is injected through the water injection hole of the grout stop plug 10 and the pressure is increased to 1MPa, and the grout stop plug 10 is determined to be fully expanded at the tail part of the sleeve of the pipe shed 9.
Further describing, in the step 6), cement-based variable-speed setting materials are injected through the hollow anchor rods 7 for grouting, the grout stop plugs 10 are decompressed and removed after grouting is completed, the guide pipe plugs 15 are installed, and TBM tunneling construction is resumed.
In the invention, steps 2) to 6) only describe the construction method of a single pipe shed, and partial processes can be synchronously carried out in the whole pipe shed implementation process.
Example 2: the difference from example 1 is that: in the step 1), a hollow anchor rod 7 is respectively applied from the tail of the shield and the inside of the cutter head 2, and the hollow anchor rod 7 is used for grouting and consolidation to form the annular grout stop wall.
Further describing, in the step 1), a hollow anchor rod 7 with the diameter of 30mm is constructed from the tail of the shield along the direction of a camber angle, the construction range is 150 degrees at the vault, the rock-entering depth is 3m, and the annular interval is 1 m; a glass fiber hollow anchor rod 8 with the diameter of 30mm is radially constructed in a cutter head 2, the construction range is 150 degrees, the rock-entering depth is 0.5-1.5 m, and the annular distance is 1 m; wherein, resin double-liquid slurry is poured into the side top arch through the hollow anchor rod 7 and the glass fiber hollow anchor rod 8 for consolidation and reinforcement.
In the step 1), a hollow anchor rod with the diameter of 30mm is constructed from the tail part of the shield along the direction of a camber angle, the construction range is 140 degrees at the vault, the rock-entering depth is 5m, and the circumferential distance is 0.8 m; a glass fiber hollow anchor rod with the diameter of 30mm is radially constructed in a cutter head, the construction range is 130 degrees, the rock-entering depth is 0.5 m-1.5 m, and the annular distance is 0.8 m; wherein, resin double-liquid slurry is poured into the side arch through the hollow anchor rod and the glass fiber hollow anchor rod for consolidation and reinforcement.
Claims (8)
1. An open TBM front-mounted type advanced pipe shed construction method is characterized by comprising the following steps:
1) applying a hollow anchor rod for grouting, and reinforcing the side arch of the shield and the cutter head region;
2) conducting guide hole construction;
3) arranging an advanced pipe shed;
4) backfilling a gap between the pipe shed and the guide hole by grouting;
5) installing an exhaust pipe and a grout stop plug;
6) and grouting the pipe shed.
2. The construction method of the open type TBM front-mounted type advanced pipe shed as claimed in claim 1, is characterized in that: in the step 1), a hollow anchor rod is respectively applied from the tail part of the shield and the inside of the cutter head, and is solidified by grouting through the hollow anchor rod to form the annular grout stop wall.
3. The construction method of the open type TBM front-mounted type advanced pipe shed as claimed in claim 2, is characterized in that: in the step 1), a hollow anchor rod with the diameter of 30mm is constructed from the tail part of the shield along the direction of a camber angle, the construction range is 140-150 degrees at the vault, the rock-entering depth is 3-5 m, and the circumferential distance is 0.8-1 m; a glass fiber hollow anchor rod with the diameter of 30mm is radially constructed in a cutter head, the construction range is 130-150 degrees, the rock-entering depth is 0.5-1.5 m, and the annular distance is 0.8-1 m; wherein, resin double-liquid slurry is poured into the side arch through the hollow anchor rod and the glass fiber hollow anchor rod for consolidation and reinforcement.
4. The construction method of the open type TBM front-mounted type advanced pipe shed as claimed in claim 3, wherein: in the step 2), a front pipe shed drilling machine moves forwards to a pipe shed construction position, the camber angle of the drilling machine is adjusted to be 4-5 degrees, a core taking drill bit and a core taking pipe are installed, a drill rod is connected to a rock entering position, the core taking length is 1m, and a guide hole is formed after core taking is completed.
5. The construction method of the open type TBM front-mounted type advanced pipe shed as claimed in claim 4, is characterized in that: in the step 3), the coring bit is withdrawn, the down-the-hole bit is replaced, and the tail end of the pipe shed is positioned outside the tunnel excavation contour line; and no grout overflow hole is reserved at the position 4.5-4.8 m away from one end of the TBM cutter head of the pipe shed.
6. The construction method of the open type TBM front-mounted type advanced pipe shed as claimed in claim 5, wherein: in the step 4), a steel pipe with the diameter of 10mm is inserted into a gap between the pipe shed and the hole wall through a joint filling tool, the front end of the steel pipe exceeds the tail end of the pipe shed by 1-1.2 m, resin double-liquid slurry is poured into the steel pipe to plug the gap, and the steel pipe retreats while being poured.
7. The construction method of the open type TBM front-mounted type advanced pipe shed as claimed in claim 6, wherein: in the step 5), a PVC exhaust pipe with the diameter of 20mm is connected with an exhaust hole of the three-hole grout stopping plug, and the total length of the PVC exhaust pipe and the three-hole grout stopping plug is slightly shorter than the length of the pipe shed; the PVC exhaust pipe and the grout stop plug are inserted into the pipe shed together according to the design position, water is injected through the water injection hole of the grout stop plug and the pressure is increased to 1MPa, and the grout stop plug is confirmed to be fully expanded at the tail of the sleeve of the pipe shed.
8. The construction method of the open type TBM front-mounted type advanced pipe shed as claimed in claim 7, is characterized in that: and 6), injecting a cement-based variable-speed setting material through the hollow anchor rod for grouting, releasing pressure of the grout stop plug after grouting is finished, removing the grout stop plug, installing a guide pipe plug, and recovering TBM tunneling construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110710340.3A CN113236263B (en) | 2021-06-25 | 2021-06-25 | Construction method of open TBM front-mounted type advanced pipe shed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110710340.3A CN113236263B (en) | 2021-06-25 | 2021-06-25 | Construction method of open TBM front-mounted type advanced pipe shed |
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| Publication Number | Publication Date |
|---|---|
| CN113236263A true CN113236263A (en) | 2021-08-10 |
| CN113236263B CN113236263B (en) | 2023-03-24 |
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| CN202110710340.3A Active CN113236263B (en) | 2021-06-25 | 2021-06-25 | Construction method of open TBM front-mounted type advanced pipe shed |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101408106A (en) * | 2007-10-12 | 2009-04-15 | 中煤第三建设（集团）有限责任公司 | Small tube shed pre-grouting method |
| CN102134998A (en) * | 2011-04-27 | 2011-07-27 | 中铁二局股份有限公司 | Construction method for wind-blown sand tunnel |
| CN106194204A (en) * | 2016-09-08 | 2016-12-07 | 长安大学 | A kind of drift cobble tunnel advanced support structure and method for protecting support |
| CN207598242U (en) * | 2017-12-07 | 2018-07-10 | 中铁十八局集团有限公司 | A kind of TBM advance supports reassembling type guider |
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