CN108952772A - More voussoir tunnels steelframe - Google Patents
More voussoir tunnels steelframe Download PDFInfo
- Publication number
- CN108952772A CN108952772A CN201811005521.0A CN201811005521A CN108952772A CN 108952772 A CN108952772 A CN 108952772A CN 201811005521 A CN201811005521 A CN 201811005521A CN 108952772 A CN108952772 A CN 108952772A
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- China
- Prior art keywords
- steel column
- voussoir
- steelframe
- vault
- lateral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 136
- 239000010959 steel Substances 0.000 claims abstract description 136
- 239000011435 rock Substances 0.000 claims abstract description 23
- 238000013268 sustained release Methods 0.000 claims abstract description 22
- 239000012730 sustained-release form Substances 0.000 claims abstract description 22
- 238000010276 construction Methods 0.000 claims description 12
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 6
- 239000004567 concrete Substances 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000009417 prefabrication Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 230000007812 deficiency Effects 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 abstract description 2
- 238000011161 development Methods 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 241001494479 Pecora Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241001551112 Hainardia cylindrica Species 0.000 description 1
- 241000145637 Lepturus Species 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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
-
- 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
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
- E21D11/183—Supporting means for arch members, not provided for in E21D11/22
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural 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 belongs to tunnel reinforcement technical field, in particular to a kind of more voussoir tunnels steelframe.Including oblique short steel column, voussoir, lateral steel column, bottom support bracket, sustained release pad, backing plate, prepared screw-bolt hole, connection sleeve, vault steel column；Voussoir includes tip threaded portion and ring pads, and bottom support bracket includes precast base part and reserves cast-in-place position.The present invention intends to solve the problems, such as that narrow-bore tunnel supporting vault is givey, profile steel frame is overcome to lead to the defect for being readily bent or surrendering vulnerable to concentration of local load or Eccentric Load.Reserve multiple voussoir positions, multiple voussoirs are set, previous voussoir number deficiency bring steelframe and country rock connectivity problem are avoided, connectivity problem between traditional voussoir and steelframe is improved, increases sustained release pad with ground connected component, absorb small deformation stress, using light high steel column, weaken steelframe effect of weight, size economy, can prefabrication, be functional more comprehensive steelframe.
Description
Technical field
The invention belongs to tunnel reinforcement technical field, in particular to a kind of more voussoir tunnels steelframe.
Background technique
China is the country on mountain more than one, and southwest 80% is mountainous region, accounts for about the 30% of national mountainous region area.This piece soil
It lives on the ground a national more than 20, the city of more than 100,000,000 people, subway, highway, railway are the main traffic modes of people's trip.It is existing
The valuable source of country is had become in, road, for promoting national economy to increase, improving people's living standard, maintenance country peace
Congruence all has important value.The development of road is not only the composition portion of economic needs and human civilization and modernization
Point.And there is vital effect in tunnel as the important node in road.It is obtained in the construction of tunnel construction in recent years
Rapid development.Qinling Zhongnanshan Mountain vcehicular tunnel, single long 18.02km in hole, double hole one-way traffics, the construction scale world
One, China highway tunnel most.The Xiamen tunnel Xiang An is China's Mainland First big cross section seabed tunnel, to China's tunnel construction
The progress and development of technology, diminution and world-class gap, play the role of landmark.At present in the port pearl built
Tunnel segment in Australia's bridge spanning the sea also represents the forefront of tunnel development.
The supporting of subterranean tunnel has preliminary bracing and later period supporting.Just branch is generally in preliminary bracing, is exactly just to have excavated to adopt
Some support patterns, for example with regard to simple anchor pole suspended net shotcrete supporting when wall rock condition, wall rock condition difference words are just used
Section-steel support, then spray anchor.Later period supporting is called secondary lining, and it is exactly with lining trolley casting concrete that referred to as two, which serve as a contrast,.It is small disconnected
In excavation and support processes, constructor is always easy to ignore geological conditions in face tunnel, it is believed that tunnel diameter of section is small, country rock after excavation
From arching, country rock can be within the scope of self-supporting, so can hardly meet voussoir on steelframe under normal circumstances when supporting construction and be more than
5, the steelframe of narrow-bore tunnel is supported always to be easy to happen axial bias, premature surrender as a result,；It is bonded between steelframe and country rock
It is not close, due to excavate country rock surface be not it is smooth, be easy to happen stress raisers phenomenon at the position contacted with steelframe, increase
The big probability of steelframe damage and excessive possibility is lost, cannot function as permanent support, increase the cost of tunnel construction, need two
Except secondary excavation construction, the environmental protection concept of tunnel construction has also been violated.
It is connected not closely in short, previous narrow-bore tunnel is always likely to encounter between component and component in Bracing Process；Component
It is not bonded between country rock, the problems such as steelframe bottom easily occurs to country rock Slideslip.
Summary of the invention
For the technical problem more than solving, the present invention develops a kind of more wedges for the above-mentioned existing deficiency there are technology
Block tunnel steelframe can improve profile steel frame vulnerable to local collection for solving the problems, such as that narrow-bore tunnel supporting vault is givey
Middle load and Eccentric Load lead to the defect for being readily bent or surrendering, and connectivity problem between traditional voussoir and steelframe are improved, with ground
Base connected component increases sustained release pad, absorbs small deformation stress, using light high steel column, weakens steelframe effect of weight, is a kind of function
It can the more comprehensive steelframe of property.
The technical solution adopted by the present invention:
A kind of more voussoir tunnels steelframe, including tiltedly short steel column, voussoir, lateral steel column, bottom support bracket, sustained release pad, backing plate, reserved spiral shell
Keyhole, connection sleeve and vault steel column；Wherein voussoir includes tip threaded portion, ring pads；Bottom support bracket includes precast base portion
Divide and reserve cast-in-place position；
Backing plate is embedded in ground, and backing plate is close in sustained release pad downside, and upside connects with bottom support bracket, and the bottom end of lateral steel column is fallen
Seat reserves cast-in-place position in bottom support bracket；In addition to lateral steel column bottom section, oblique short steel column is uniformly welded on lateral steel
On column and vault steel column, vault steel column is connected by connection sleeve with lateral steel column and is inserted into bolt in prepared screw-bolt hole,
It screws firm；Voussoir is evenly distributed on steelframe and is anchored in country rock.
Further, the backing plate is rigid, and when steelframe stress, backing plate can replace ground stress.
Further, sustained release pad is elastic, absorbable part stress or offset due to steelframe stress generate to
Under thin tail sheep.
Further, voussoir increases tip threaded portion, ring pads compared to previous traditional voussoir, and tip threaded portion is abided by
Bolt support mechanism is followed, voussoir fits closely steelframe and country rock in the form anchored, increases ring pads and reduces steelframe and wedge
The friction of block contact portion, meanwhile, ring pads can play the role of reduction steelframe stress and deform.
Further, by oblique short steel column fixed range between the steel column and steel column, using triangular truss structure
Supporting way.
Further, the weak location in steel column, voussoir are that one end is contacted with steelframe, the other end and oblique short steel column
With the connection point contact of lateral steel column, or the connection point contact with oblique short steel column and vault steel column, the work of supplementary support is played
With.
Further, tiltedly short steel column and the lateral steel column are structure as a whole, and oblique short steel column and vault steel column are integrated knot
Structure, can be by prefabrication, and produces in batches, and the specification of quality is more unified, time saving and energy saving when constructing tunnel.
Further, the construction method of more voussoir tunnels steelframe, comprising the following steps:
First part is the splicing installation of steelframe, and second part is taking a seat for bottom support bracket；
A. it when steelframe is installed, first by the fixed vault steel column of voussoir, finds the position of vault steel column accurately, then inserts tip threaded portion
Enter in country rock, the contact portion of voussoir and vault steel column is ring pads；
B. the left and right sides is constructed simultaneously, and lateral steel column and vault steel column are connected, inserted by the connection sleeve in lateral steel column
Enter in the connection sleeve of vault steel column, after alignment aims at prepared screw-bolt hole, in a manner of bolted, bolt is inserted into reserved spiral shell
In keyhole, lateral steel column is connected with vault steel column and is finished；
C. 2 voussoirs of the lateral steel column close to vault of two sides are fixed respectively, and taking a seat for bottom support bracket is applied for two sides simultaneously at this time
The bottom end insertion bottom support bracket of lateral steel column is reserved cast-in-place position by work；
D. it when steelframe splicing installation does not operate, estimates lateral steel column bottom end and is projected in ground location, preset backing plate and sustained release pad
Position, after installing backing plate and sustained release pad, the insertion of lateral steel column slowly moves bottom support bracket while reserving cast-in-place position
Onto sustained release pad, after the completion of insertion operation and moving operation, whether calibration steelframe occurs laterally offset, such as occurs, please slowly moves
Cast-in-place position is being reserved to adjust deviation in the bottom end for moving lateral steel column, does not deviate such as, then carries out last 1 step；
E. it by 2 last voussoirs in the rest position close to bottom support bracket, is embedded in country rock and cast-in-place position will be reserved
Gap and rest position, placing concrete fill up.
Beneficial effects of the present invention:
Beneficial effects of the present invention are specifically divided into following aspect:
1. backing plate of the invention be it is rigid, be embedded in ground in, as a part of ground, when steelframe stress, backing plate replace
Ground stress weakens the loss to subsoil.
2. sustained release pad of the invention be it is elastic, can absorb part stress or offset due to steelframe stress generate it is downward
Thin tail sheep, while playing slow releasing function.
3. the tip threaded portion that voussoir includes, ring pads and tip threaded portion follow bolt support mechanism, voussoir is with anchor
Solid form steelframe and country rock are fitted closely.
4. voussoir of the invention increases tip threaded portion, ring pads, tip threaded portion compared to previous traditional voussoir
Have followed bolt support mechanism, fitted closely steelframe and country rock in the form of anchoring, while increasing ring pads, avoid steelframe with
The friction of voussoir contact portion, meanwhile, ring pads can play the role of reply when small deformation occurs for steelframe stress.
5. using triangular truss structure by oblique short steel column fixed range and distance between steel column and steel column of the invention
Supporting way, keep steel frame construction more firm, size economy.
6. voussoir one end of the invention is contacted with steelframe, one end and oblique short steel column and lateral steel column or vault steel column (9)
Point contact is connected, in the weak location of steel column, plays supplementary support and fixed effect.
7. oblique short steel column of the invention and lateral steel column are structure as a whole, oblique short steel column and vault steel column are structure as a whole,
The two can be by prefabrication, and can be mass, and the specification of quality is more unified, time saving and energy saving when constructing tunnel.
8. avoiding traditional steelframe from fully relying on voussoir to avoid steel in insertion bottom support bracket in lateral steel column bottom end of the invention
For frame to the trend of country rock Slideslip, bottom support bracket not only acts as fixing seat effect, while contacting closer by steelframe and ground,
It avoids that lateral sliding occurs.
Detailed description of the invention
Fig. 1 is the more voussoir tunnel steelframe overall schematics of the present invention；
Fig. 2 is voussoir schematic diagram of the present invention；
Fig. 3 is the lateral steel column of the present invention and vault steel column connection schematic diagram；
Fig. 4 is bottom support bracket schematic diagram of the present invention；
In figure, 1 for oblique short steel column, 2 it is voussoir, 3 is lateral steel column, 4 is bottom support bracket, 5 is sustained release pad, 6 is backing plate, 7 is pre-
Stay bolt hole, 8 be connection sleeve, 9 be vault steel column, 2-1 is tip threaded portion, 2-2 is ring pads, 4-1 is precast base portion
Divide and 4-2 is to reserve cast-in-place position.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments, but cannot be interpreted as them
Limiting the scope of the present invention.
Embodiment: as Figure 1-Figure 4, a kind of more voussoir tunnels steelframe, including tiltedly short steel column 1, voussoir 2, lateral steel column
3, bottom support bracket 4, sustained release pad 5, backing plate 6, prepared screw-bolt hole 7, connection sleeve 8 and vault steel column 9；
The backing plate 6 be it is rigid, be embedded in ground in, the sustained release pad 5 be it is elastic, sustained release pad 5 on the downside of be close to backing plate 6,
Upside connects with bottom support bracket 4, and the bottom end of lateral steel column 3 is seated in bottom support bracket 4 and reserves cast-in-place position 4-2；Except lateral
Outside 3 bottom section of steel column, oblique short steel column 1 is uniformly welded on lateral steel column 3 and vault steel column 9, vault steel column 9 and lateral steel
Column 3 is connected by connection sleeve 8 and is inserted into bolt in prepared screw-bolt hole 7, is screwed firm；Voussoir 2 is evenly distributed in steel
On frame and it is anchored in country rock；
By oblique short 1 fixed range of steel column between the steel column and steel column, using the supporting way of triangular truss structure；
The weak location in steel column, voussoir 2 are that one end is contacted with steelframe, the other end and tiltedly short steel column 1 and lateral steel column 3
Connection point contact, or the connection point contact with oblique short steel column 1 and vault steel column 9；
Tiltedly short steel column 1 and the lateral steel column 3 are structure as a whole, and oblique short steel column 1 and vault steel column 9 are structure as a whole；
The construction method of more voussoir tunnels steelframe, comprising the following steps:
First part is the splicing installation of steelframe, and second part is taking a seat for bottom support bracket 4；
A. when steelframe is installed, first by the fixed vault steel column 9 of voussoir 2, the position of vault steel column 9 is found accurately, then by tip threaded portion
Divide in 2-1 insertion country rock, the contact portion of voussoir 2 and vault steel column 9 is ring pads 2-2；
B. the left and right sides is constructed simultaneously, lateral steel column 3 is connected with vault steel column 9, by the connection sleeve in lateral steel column 3
In the connection sleeve 8 of 8 insertion vault steel columns 9, after alignment aims at prepared screw-bolt hole 7, in a manner of bolted, bolt is inserted into
In prepared screw-bolt hole 7, lateral steel column 3 and the connection of vault steel column 9 are finished；
C. 2 voussoirs 2 of the lateral steel column 3 close to vault of two sides are fixed respectively, and taking a seat for bottom support bracket 4 is same for two sides at this time
When construct, insertion bottom support bracket 4 in the bottom end of lateral steel column 3 is reserved into cast-in-place position 4-2；
D. it when steelframe splicing installation does not operate, estimates lateral 3 bottom end of steel column and is projected in ground location, preset backing plate 6 and sustained release
The position of pad 5, after installing backing plate 6 and sustained release pad 5, lateral steel column 3 is inserted into bottom support bracket while reserving cast-in-place position 4-2
4 are slowly moved on sustained release pad 5, and after the completion of insertion operation and moving operation, whether calibration steelframe occurs laterally offset, such as send out
Raw, cast-in-place position 4-2 is being reserved to adjust deviation in the bottom end for please slowly moving lateral steel column 3, does not deviate such as, then carries out last
1 step；
E. it by 2 last voussoirs 2 in the rest position close to bottom support bracket 4, is embedded in country rock and cast-in-place position will be reserved
The gap of 4-2 and rest position, placing concrete fill up.
As shown in Figure 2 and Figure 4, voussoir 2 includes tip threaded portion 2-1, ring pads 2-2；Bottom support bracket 4 includes precast base
Part 4-1 and reserve cast-in-place position 4-2.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of more voussoir tunnels steelframe, it is characterised in that: including oblique short steel column (1), voussoir (2), lateral steel column (3), bottom
Support (4), sustained release pad (5), backing plate (6), prepared screw-bolt hole (7), connection sleeve (8) and vault steel column (9)；Wherein voussoir (2)
Including tip threaded portion (2-1), ring pads (2-2)；Bottom support bracket (4) includes precast base part (4-1) and reserves cast-in-place position
Set (4-2)；
Backing plate (6) is embedded in ground, is close to backing plate (6) on the downside of sustained release pad (5), cushion (5) upside and bottom support bracket (4)
Connect, the bottom end of lateral steel column (3) is seated in precast base part (4-1) and reserves cast-in-place position (4-2)；Except lateral steel column
(3) outside bottom section, voussoir (2) is evenly distributed on steelframe and is anchored in country rock, and oblique short steel column (1) is welded on lateral steel
On the diagonal line that column (3) and voussoir (2) surround or on diagonal line that vault steel column (9) and voussoir (2) surround, vault steel column (9)
It is connected with lateral steel column (3) by connection sleeve (8) and is inserted into bolt in prepared screw-bolt hole (7), is screwed firm.
2. more voussoir tunnels steelframe according to claim 1, it is characterised in that: backing plate (6) is rigid.
3. more voussoir tunnels steelframe according to claim 1, it is characterised in that: sustained release pad (5) is elastic.
4. more voussoir tunnels steelframe according to claim 1, it is characterised in that: voussoir (2) includes ring pads (2-2) and tip
Threaded portion (2-1) simultaneously follows bolt support mechanism, and voussoir (2) is fitted closely steelframe and country rock in the form of anchoring.
5. more voussoir tunnels steelframe according to claim 1, it is characterised in that: pass through oblique short steel column between steel column and steel column
(1) fixed range, using the supporting way of triangular truss structure.
6. more voussoir tunnels steelframe according to claim 1, it is characterised in that: in the weak location of steel column, voussoir (2) is equal
Contacted for one end with steelframe, the connection point contact of the other end and oblique short steel column (1) and lateral steel column (3), or with tiltedly short steel column (1)
With the connection point contact of vault steel column (9).
7. more voussoir tunnels steelframe according to claim 1, it is characterised in that: oblique short steel column (1) and lateral steel column (3) are
Integral structure, oblique short steel column (1) and vault steel column (9) are structure as a whole.
The construction method of the tunnel of voussoir more than 8. steelframe, it is characterised in that: the following steps are included:
First part is the splicing installation of steelframe, and second part is taking a seat for bottom support bracket (4)；
It is first fixed vault steel column (9) by voussoir (2) when steelframe is installed, the position of vault steel column (9) is found accurately, then by tip spiral shell
Line part (2-1) is inserted into country rock, and the contact portion of voussoir (2) and vault steel column (9) is ring pads (2-2)；
The left and right sides is constructed simultaneously, and lateral steel column (3) and vault steel column (9) are connected, by the connection in lateral steel column (3)
Sleeve (8) is inserted into the connection sleeve (8) of vault steel column (9), after alignment aims at prepared screw-bolt hole (7), with bolted side
Bolt is inserted into prepared screw-bolt hole (7) by formula, and lateral steel column (3) and vault steel column (9) connection finish；
2 voussoirs (2) of the lateral steel column (3) close to vault of two sides are fixed respectively, and bottom support bracket (4) take a seat, and are at this time two
Side is constructed simultaneously, and cast-in-place position (4-2) is reserved in bottom end insertion bottom support bracket (4) of lateral steel column (3)；
When steelframe splicing installation does not operate, estimates lateral steel column (3) bottom end and be projected in ground location, it is gentle to preset backing plate (6)
The position for releasing pad (5), after installing backing plate (6) and sustained release pad (5), the same of cast-in-place position (4-2) is reserved in lateral steel column (3) insertion
When bottom support bracket (4) is slowly moved on sustained release pad (5), after the completion of insertion operation and moving operation, whether calibration steelframe is sent out
Raw laterally offset, such as occurs, cast-in-place position (4-2) is being reserved to adjust deviation, such as in the bottom end for please slowly moving lateral steel column (3)
It does not deviate, then carries out last 1 step；
By 2 last voussoirs (2) in the rest position close to bottom support bracket (4), it is embedded in country rock and cast-in-place position will be reserved
Gap and the rest position of (4-2) are set, placing concrete fills up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811005521.0A CN108952772A (en) | 2018-08-30 | 2018-08-30 | More voussoir tunnels steelframe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811005521.0A CN108952772A (en) | 2018-08-30 | 2018-08-30 | More voussoir tunnels steelframe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108952772A true CN108952772A (en) | 2018-12-07 |
Family
ID=64473566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811005521.0A Withdrawn CN108952772A (en) | 2018-08-30 | 2018-08-30 | More voussoir tunnels steelframe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108952772A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111441797A (en) * | 2020-04-30 | 2020-07-24 | 重庆交通大学 | Prefabricated arch for reinforcing and maintaining tunnel lining |
| CN115405338A (en) * | 2022-09-22 | 2022-11-29 | 中铁十四局集团隧道工程有限公司 | Subway construction top strutting arrangement |
-
2018
- 2018-08-30 CN CN201811005521.0A patent/CN108952772A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111441797A (en) * | 2020-04-30 | 2020-07-24 | 重庆交通大学 | Prefabricated arch for reinforcing and maintaining tunnel lining |
| CN115405338A (en) * | 2022-09-22 | 2022-11-29 | 中铁十四局集团隧道工程有限公司 | Subway construction top strutting arrangement |
| CN115405338B (en) * | 2022-09-22 | 2023-05-09 | 中铁十四局集团隧道工程有限公司 | Subway construction top strutting arrangement |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181207 |
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| WW01 | Invention patent application withdrawn after publication |