CN115263370A - Construction process for grouting of tunnel reinforcing steel ring sheet - Google Patents
Construction process for grouting of tunnel reinforcing steel ring sheet Download PDFInfo
- Publication number
- CN115263370A CN115263370A CN202210768295.1A CN202210768295A CN115263370A CN 115263370 A CN115263370 A CN 115263370A CN 202210768295 A CN202210768295 A CN 202210768295A CN 115263370 A CN115263370 A CN 115263370A
- Authority
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- China
- Prior art keywords
- tunnel
- reinforcing steel
- steel ring
- grouting
- steel sheet
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- Granted
Links
- 229910001294 Reinforcing steel Inorganic materials 0.000 title claims abstract description 51
- 238000010276 construction Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 239000000428 dust Substances 0.000 claims abstract description 39
- 238000004140 cleaning Methods 0.000 claims abstract description 24
- 239000000945 filler Substances 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 230000002787 reinforcement Effects 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 7
- 239000012459 cleaning agent Substances 0.000 claims abstract description 7
- 201000010099 disease Diseases 0.000 claims abstract 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 claims abstract 2
- 230000000694 effects Effects 0.000 claims description 17
- 239000011440 grout Substances 0.000 claims description 14
- 238000005516 engineering process Methods 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 11
- 230000001070 adhesive effect Effects 0.000 abstract description 5
- 239000000853 adhesive Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000005406 washing Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005267 amalgamation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- E21D11/155—Laggings made of strips, slats, slabs or sheet piles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/04—Cleaning by suction, with or without auxiliary action
-
- 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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- 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)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a construction process for grouting a tunnel reinforcing steel ring sheet, which is applied to reinforcing a tunnel preliminary building section in the case of subway tunnel diseases, reinforcing the preliminary building of the tunnel by using a reinforcing steel sheet, and cleaning the preliminary building and the reinforcing steel sheet by using cleaning equipment, wherein the cleaning equipment comprises a dust collector, a hose, an air blower and a cleaning agent. According to the construction process for grouting the tunnel reinforcing steel ring sheet, the primary dust removal and the secondary dust removal are realized by performing dust suction and dust blowing between the steel ring sheet and the tunnel before edge sealing, so that dust between the steel ring sheet and the tunnel is cleaned, the phenomenon that the dust reduces the adhesiveness of a filling agent is avoided, and the strength of the filling agent is increased, thereby increasing the strength of the grouting material for bonding the steel ring sheet and the tunnel to be initially built; through using the sanitizer washing pipe border before the banding, further the ash removal to the intensity of reinforcing steel ring banding increases the adhesive intensity of whole reinforcement.
Description
Technical Field
The invention relates to the technical field of tunnel reinforcement, in particular to a construction process for grouting a steel ring sheet for tunnel reinforcement.
Background
The tunnel reinforcing steel ring is based on the essential hardware of shield method tunnel reinforcement maintenance in very important, and steel reinforcing steel ring (make after the amalgamation welding) that the diameter is close through setting up along the tunnel inner wall is with fixed tunnel structure, increases the stability in tunnel, realizes waterproof isolation etc. purpose simultaneously, owing to there is the space between steel ring piece and the tunnel is built just, need use the filler to fill for fastening connection between the two.
When punching and reinforcing the steel ring piece, can produce a certain amount of dust and stop between steel ring piece and the tunnel is built just, on the tunnel near steel ring piece border and steel ring piece border is built just, because the isolation of dust, the intensity of banding and the adhesiveness of filler all can receive the influence, thereby influence the intensity that steel ring grouting material bonding steel ring piece and tunnel were built just, and increased because of the insufficient possibility that forms the hollowing of grout, so, propose the construction technology of tunnel reinforcement steel ring piece grout and solve above-mentioned problem.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a construction process for grouting the steel ring sheets for tunnel reinforcement, which has the advantage of enhancing the reinforcement strength.
In order to achieve the purpose, the invention provides the following technical scheme: a construction process for grouting a steel ring sheet for reinforcing a tunnel is applied to reinforcing a primary building section of the tunnel when the subway tunnel is damaged, reinforcing the primary building of the tunnel by using a reinforcing steel sheet, and cleaning the primary building and the reinforcing steel sheet of the tunnel by using cleaning equipment, wherein the cleaning equipment comprises a dust collector, a hose, an air blower and a cleaning agent;
firstly, fixing a reinforcing steel sheet to a tunnel primary building through bolts according to construction requirements;
secondly, inserting one end of a hose into an air inlet of a dust collector, extending the other end of the hose into a gap between a reinforcing steel sheet and the primary building of the tunnel, and sucking a large amount of dust; hoses with different thicknesses can be selected according to the size of a gap between the reinforced steel sheet and the primary building of the tunnel;
thirdly, a blower is used for aligning a gap between the reinforced steel sheet and the primary building of the tunnel to perform secondary dust removal;
fourthly, cleaning the edge of the reinforced steel sheet and the primary building surface of the tunnel at the periphery of the reinforced steel sheet by using tools such as a cleaning agent, a brush and the like;
fifthly, edge sealing is carried out on the edge seams of the primarily built reinforcing steel sheets and the tunnel through edge sealing agents, and meanwhile, a plurality of embedded pipes are embedded at the edge sealing positions;
sixthly, filling a filler between the reinforcing steel sheet and the primary building of the tunnel through the embedded pipe;
and seventhly, tying the embedded pipes to finish the whole grouting construction process.
Further, the body of the hose has a certain rigidity.
Further, the caliber of the blowing nozzle of the blowing machine is matched with the gap between the reinforced steel sheet and the tunnel which is built for the first time.
Furthermore, in the sixth step, a plurality of embedded pipes are distributed up and down, and the lengths of the adjacent embedded pipes in one-to-one correspondence are staggered, so that the long embedded pipes can be folded and inserted into the short embedded pipes, and the structural leveling is kept.
Preferably, in the seventh step, the filler is an epoxy resin.
Preferably, before the fourth step, the cleaning effect is manually checked by naked eyes, if the cleaning effect meets the expected standard, the next step is carried out, and if the cleaning effect obviously does not meet the standard, the second step and the third step are repeated.
Compared with the prior art, the technical scheme of the application has the following beneficial effects:
1. this construction technology of tunnel reinforcement steel ring piece grout inhales the ash and blows the ash between steel ring piece and tunnel before through the banding, realize primary dust removal and secondary dust removal, the dust between clearance steel ring piece and the tunnel, avoid the dust to reduce the cohesiveness of filler, increase the adhesive force of filler between reinforcing steel ring piece and tunnel build just, and less hollowing because of the dust causes, thereby increase the intensity that grouting material bonding steel ring piece and tunnel built just.
2. This construction technology of tunnel reinforcement steel ring piece grout through use sanitizer washing pipe border before the banding, further the ash removal to the intensity of reinforcing steel ring banding increases the adhesive intensity of whole reinforcement, and the pressure of grout when can also improving the grout reduces the hollowing.
Drawings
FIG. 1 is a flow chart of the construction process of the present invention;
FIG. 2 is a sectional view of a tunnel constructed according to the present invention;
FIG. 3 is a schematic structural view of a tunnel primary building and reinforcing steel sheet in the construction process of the invention.
In the figure: 1. primarily building a tunnel; 2. reinforcing the steel sheet; 3. and (4) bolts.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1-3, the construction process of grouting the steel ring sheets for tunnel reinforcement in this embodiment is applied to reinforcement of a tunnel preliminary building 1 section in case of a subway tunnel defect, the tunnel preliminary building 1 is reinforced by the reinforcement steel sheets 2, the tunnel preliminary building 1 and the reinforcement steel sheets 2 are cleaned by cleaning equipment, the cleaning equipment includes a dust collector, a hose, a blower and a cleaning agent, and the construction process includes;
firstly, fixing a reinforcing steel sheet 2 to a tunnel primary building 1 through bolts 3 according to construction requirements;
secondly, inserting one end of a hose into an air inlet of a dust collector, and extending the other end of the hose into a gap between the reinforcing steel sheet 2 and the tunnel primary building 1 to absorb a large amount of dust;
thirdly, a blower is used for aligning a gap between the reinforced steel sheet 2 and the tunnel primary building 1 to perform secondary dust removal;
fourthly, cleaning the edge of the reinforcing steel sheet 2 and the surface of the primary building 1 of the peripheral tunnel by using tools such as cleaning agent, brush and the like;
fifthly, edge sealing is carried out on the edge seams of the reinforcing steel sheet 2 and the tunnel primary building 1 through edge sealing agents, and meanwhile, a plurality of pre-buried pipes are pre-buried at the edge sealing positions;
sixthly, filling a filler between the reinforcing steel sheet 2 and the tunnel primary building 1 through the embedded pipe;
and seventhly, tying the embedded pipes to finish the whole grouting construction process.
This construction process is through before the banding, inhale the ash and blow the ash to the clearance of consolidating steel sheet 2 and tunnel and building 1 just, realize primary dust removal and secondary dust removal, guarantee the effect of the clean dust in the clearance of consolidating steel sheet 2 and tunnel and building 1 just, through before the banding, wash and consolidate 2 borders of steel sheet and peripheral tunnel and build 1 surface just, guarantee the clean effect of side joint, be favorable to strengthening the bonding fastening effect of filler, thereby increase the intensity of grouting material bonding steel ring piece and tunnel and building 1 just, strengthen the intensity of steel ring banding, simultaneously can also improve the pressure of grout when grouting, reduce empty drum.
Further, the body of the hose has a certain rigidity.
Since the device requires the user to hold the hose in the hand and extend it into the slot, if the hose body does not have any rigidity, it is not possible to support the hose itself and to clean up dust at a fixed point.
Further, the caliber of a blowing nozzle of the blowing machine is matched with the gap between the reinforcing steel sheet 2 and the tunnel primary building 1.
Because the dust distributes more in the tunnel, if the air-blower blow gun bore is great, probably blow more wind-force to other departments, lead to the raise dust, arouse the construction inconvenience.
Furthermore, in the sixth step, the plurality of embedded pipes are distributed up and down, and the lengths of the adjacent embedded pipes in one-to-one correspondence are staggered, so that the long embedded pipes can be folded and inserted into the short embedded pipes, and the structure is kept parallel and level.
This construction technology is in milk through the mode of pre-buried pipe to the clearance, through setting up the crisscross pre-buried pipe of length for long pre-buried pipe can fold to peg graft and get into short pre-buried intraductal after the grout finishes, conveniently pricks the mouth, and guarantees to prick whole parallel and level behind the mouth, does not hinder other section of jurisdiction installations yet simultaneously beautifully.
Preferably, in the seventh step, the filler is an epoxy resin.
The epoxy resin has low cost, convenient curing, strong adhesive force and low shrinkage, and is suitable to be used as an optimal filling agent.
Preferably, before the fourth step, the cleaning effect is manually checked by naked eyes, if the cleaning effect meets the expected standard, the next step is carried out, and if the cleaning effect obviously does not meet the standard, the second step and the third step are repeatedly operated, so that the cleaning effect is ensured.
In the application, the dust collector and the blower are both the prior art, but not the innovative technology of the patent, and the detailed description is omitted.
The utility model provides a focus lies in will consolidate steel sheet 2 and tunnel and build 1 assembly back direct grout, the adjustment improves for the clearance leave over between the steel sheet 2 of consolidating and the tunnel is built 1 just, the dust of limit seam, the back grout, the bonding strength of filler is increased in this design to increased and consolidated steel sheet 2 and the tunnel build 1 just between with the intensity of both banding, the pressure of grout when can also improving the grout reduces the hollowing.
The working principle of the construction process is as follows:
when reinforcing tunnel primary building 1, need earlier to consolidate steel sheet 2 and snatch through the arm, laminate the inner wall of tunnel primary building 1 as far as possible, then through the hole that consolidates steel sheet 2 and reserve, punch on tunnel primary building 1, punch a hole and just install a fixing bolt 3, until the steel ring piece is fixed on tunnel primary building 1 according to the construction requirement, because the installation of consolidating steel sheet 2 is the hole limit installation fixing bolt 3 that punches, so can remain a large amount of dusts that produce because of punching between consolidating steel sheet 2 and tunnel primary building 1, and the dust can influence the adhesive effect of epoxy to steel ring piece and tunnel primary building 1, still can produce the empty drum phenomenon between consolidating steel sheet 2 and tunnel primary building 1 during the grout in addition, therefore this construction technology, through before the banding, use the dust catcher, stretch into the hose and carry out the dust absorption to consolidating the clearance of consolidating steel sheet 2 and tunnel primary building 1, use and blow off the soot to both clearance department, guarantee the clearance clean dust effect of dust in consolidating steel sheet 2 and tunnel primary building 1's clearance, through before, use the cleaner and corresponding tool like can also reduce the clean reinforcing steel sheet's reinforcing steel sheet 2 and reinforcing steel sheet's marginal bonding effect of the reinforcing steel sheet and reinforcing steel sheet's marginal reinforcing when grouting, thereby the clean bonding effect of the improvement has also can be favorable to the clean reinforcing steel sheet's of the pressurization reinforcing step of the sealing and the sealing reinforcing steel sheet's reinforcing steel edge bonding effect of the sealing and the reinforcing steel wire bonding of the sealing to the reinforcing steel sheet reinforcing steel edge bonding of the sealing to the above-up pressure reinforcing is realized.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a construction technology of tunnel reinforcement steel ring piece grout, tunnel is built (1) section reinforcement just when being applied to subway tunnel disease, utilizes and consolidates its characterized in that to build (1) just to the tunnel with reinforcing steel sheet (2): cleaning the tunnel primary building (1) and the reinforced steel sheet (2) by using cleaning equipment, wherein the cleaning equipment comprises a dust collector, a hose, a blower and a cleaning agent, and the construction process comprises the following steps;
firstly, fixing the reinforcing steel sheet (2) to the tunnel primary building (1) through bolts (3) according to construction requirements;
secondly, inserting one end of a fine hose into the air inlet of the dust collector, and extending the other end of the fine hose into a gap between the reinforced steel sheet (2) and the tunnel primary building (1) to absorb a large amount of dust;
thirdly, aligning the air blower to the gap between the reinforced steel sheet (2) and the tunnel primary building (1) to perform secondary dust removal;
fourthly, cleaning the edge of the reinforced steel sheet (2) and the surface of the tunnel primary building (1) on the periphery of the edge by using tools such as the cleaning agent, the brush and the like;
fifthly, edge sealing is carried out on the edge seams of the reinforcing steel sheets (2) and the tunnel primary building (1) through edge sealing agents, and meanwhile, a plurality of pre-buried pipes are pre-buried at the edge sealing positions;
sixthly, filling a filler between the reinforcing steel sheet (2) and the tunnel primary building (1) through the embedded pipe;
and seventhly, tying the embedded pipes to finish the whole grouting construction process.
2. The construction process for grouting the tunnel reinforcing steel ring sheet according to claim 1, characterized in that: the body of the hose has a certain rigidity.
3. The construction process for grouting the tunnel reinforcing steel ring sheet according to claim 1, characterized in that: and the caliber of a blowing nozzle of the blowing machine is matched with the clearance between the reinforcing steel sheet (2) and the tunnel primary building (1).
4. The construction process for grouting the tunnel reinforcing steel ring sheet according to claim 1, characterized in that: in the sixth step, the several buried pipes distribute from top to bottom, and adjacent the length of buried pipe one-to-one is crisscross to be convenient for long but the buried pipe collapsible insert short in the buried pipe, keep the structure parallel and level.
5. The construction process for grouting the tunnel reinforcing steel ring sheet according to claim 1, characterized in that: in the seventh step, the filler is epoxy resin.
6. The construction process for grouting the tunnel reinforcing steel ring sheet according to claim 1, characterized in that: before the fourth step, the cleaning effect is checked manually, if the cleaning effect meets the expected standard, the next step is carried out, and if the cleaning effect does not meet the standard, the second step and the third step are repeated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210768295.1A CN115263370B (en) | 2022-06-30 | 2022-06-30 | Construction process for grouting tunnel reinforcement steel ring piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210768295.1A CN115263370B (en) | 2022-06-30 | 2022-06-30 | Construction process for grouting tunnel reinforcement steel ring piece |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115263370A true CN115263370A (en) | 2022-11-01 |
| CN115263370B CN115263370B (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210768295.1A Active CN115263370B (en) | 2022-06-30 | 2022-06-30 | Construction process for grouting tunnel reinforcement steel ring piece |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0932495A (en) * | 1995-07-19 | 1997-02-04 | Masayuki Sadatsuka | Bagged concrete lining method |
| CN102979536A (en) * | 2012-12-11 | 2013-03-20 | 上海市基础工程有限公司 | Construction method for tunnel segment repair and reinforcement |
| CN103061780A (en) * | 2012-12-25 | 2013-04-24 | 上海隧道工程股份有限公司 | Operating tunnel structure reinforcement construction method through steel ring |
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| JP2018199950A (en) * | 2017-05-29 | 2018-12-20 | 有限会社渋谷建材 | Capacity calculation device, capacity calculation method, and program |
| CN111648787A (en) * | 2020-04-24 | 2020-09-11 | 同济大学 | Method for reinforcing shield tunnel lining structure by adopting ultra-high performance concrete |
| CN112324475A (en) * | 2020-10-30 | 2021-02-05 | 同济大学 | Method for reinforcing shield tunnel lining structure |
| CN112682070A (en) * | 2020-12-22 | 2021-04-20 | 湖北省大唐安盛建筑工程有限公司 | Tunnel reinforcing steel ring positioning and mounting process |
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| CN215565985U (en) * | 2021-08-25 | 2022-01-18 | 中铁十一局集团有限公司 | Grouting device for improving grouting compactness of steel ring duct piece wall |
| CN114382505A (en) * | 2022-03-04 | 2022-04-22 | 中铁隧道股份有限公司 | Steel lining reinforcing method |
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-
2022
- 2022-06-30 CN CN202210768295.1A patent/CN115263370B/en active Active
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| CN216841723U (en) * | 2022-01-04 | 2022-06-28 | 中交(南京)建设有限公司 | Steel ring device suitable for reinforcing duct pieces before subway tunnel track laying |
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|---|
| 李银桑;魏纲;: "既有盾构隧道修复加固技术研究综述", 低温建筑技术, no. 02 * |
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| Publication number | Publication date |
|---|---|
| CN115263370B (en) | 2023-08-01 |
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