CN110397450B - Assembled connection method for tunnel concrete lining structure steel bars - Google Patents
Assembled connection method for tunnel concrete lining structure steel bars Download PDFInfo
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- CN110397450B CN110397450B CN201910681709.5A CN201910681709A CN110397450B CN 110397450 B CN110397450 B CN 110397450B CN 201910681709 A CN201910681709 A CN 201910681709A CN 110397450 B CN110397450 B CN 110397450B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 147
- 239000010959 steel Substances 0.000 title claims abstract description 147
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000004567 concrete Substances 0.000 title claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 17
- 238000003466 welding Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000746 Structural steel Inorganic materials 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims abstract description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 28
- 238000005452 bending Methods 0.000 claims description 27
- 230000002787 reinforcement Effects 0.000 claims description 22
- 238000009826 distribution Methods 0.000 claims description 3
- 238000005097 cold rolling Methods 0.000 claims description 2
- 238000009417 prefabrication Methods 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 description 38
- 210000003205 muscle Anatomy 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 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
- E21D11/04—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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (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 method for connecting the tunnel concrete lining structural steel bars in an assembled mode comprises the following steps of: step A: manufacturing each unit positioning jig frame according to the size of the tunnel; and (B) step (B): preliminary processing is carried out on the raw materials of the steel bars; step C: processing and forming each unit steel bar by using each positioning jig, wherein each unit steel bar is divided into an arch unit steel bar, a side wall unit steel bar and an inverted arch unit steel bar; step D: hoisting a plurality of inverted arch unit steel bars into an inverted arch foundation pit for assembly molding to form a single inverted arch section, and positioning the inverted arch section; compared with the prior art, the device has the advantages that the device is used for binding inverted arches and two lining steel bars on site, the prefabrication and assembly mechanization degree of the segments is greatly improved, the in-hole construction operators and the operation time are effectively reduced, the unit steel bars are connected through bolts, electric welding construction is not needed, and the phenomenon of two lining water seepage caused by electric welding burn waterproof plates is avoided.
Description
Technical Field
The invention belongs to the technical field of tunnel lining, and particularly relates to an assembly type connection method of tunnel concrete lining structural steel bars.
Background
The secondary lining of the tunnel is the only exposed part of all the structures of the tunnel, and the secondary lining of the tunnel is used for guaranteeing the stability of the tunnel structure and simultaneously playing a role in the appearance of the tunnel. The surrounding rock with good geological conditions has basically stable structure after primary support, and the secondary lining is used as a safety reserve, and is generally a plain concrete structure. Poor surrounding rock section hardly guarantees the long-term stability of structure after the preliminary bracing, needs the secondary lining to provide the support and guarantees tunnel structure stability, and the secondary lining is reinforced concrete structure at this moment. The construction of the secondary lining and inverted arch steel bars at the present stage generally adopts a site binding method, but the method has the defects of insufficient steel bar construction precision, low mechanization degree and the need of more construction operators, and the steel bar connection needs electric welding operation, so that the phenomenon of electric welding burn waterproof plates exists, and the waterproof effect of the secondary lining is adversely affected.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an assembled connecting method for tunnel concrete lining structural steel bars, which is accurate in positioning, high in construction efficiency and capable of being prefabricated, spliced and installed.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the method for connecting the tunnel concrete lining structural steel bars in an assembled mode is characterized by comprising the following steps of:
step A: manufacturing each unit positioning jig frame according to the size of the tunnel;
And (B) step (B): preliminary processing is carried out on the raw materials of the steel bars;
Step C: processing and forming each unit steel bar by using each positioning jig, wherein each unit steel bar is divided into an arch unit steel bar, a side wall unit steel bar and an inverted arch unit steel bar;
step D: hoisting a plurality of inverted arch unit steel bars into an inverted arch foundation pit for assembly molding to form a single inverted arch section, and positioning the inverted arch section;
Step E: and installing side wall unit steel bars on two sides of the inverted arch section to form a side wall section, installing arch unit steel bars on the side wall section to form an arch section, splicing the arch section, the side wall section and the inverted arch section into a ring to form a single tunnel stage, and arranging a settlement joint between adjacent sections.
As a preferable scheme of the invention, the positioning jig in the step A comprises a steel reinforcement framework, a steel clamping groove and a positioning bolt hole, wherein the steel clamping groove is positioned on the steel reinforcement framework, and the positioning bolt hole is positioned on the steel clamping groove.
As a preferable mode of the invention, in the step C, the constituent members of each unit reinforcing bar are placed in each positioning jig for accurate positioning, and then welding processing is performed.
As a preferred embodiment of the present invention, the unit reinforcing bars in the step C are divided into 8 units, which are respectively 3 arch unit reinforcing bars, 2 side wall unit reinforcing bars, 1 first inverted arch unit reinforcing bar and 2 second inverted arch unit reinforcing bars.
As a preferable scheme of the invention, the unit reinforcing steel bars comprise main bars, wavy connecting bars, wavy reinforcing bars, connecting bars and connecting angle steel, wherein the wavy connecting bars, the wavy reinforcing bars and the connecting bars are fixedly connected to adjacent main bars, and the connecting angle steel is fixedly connected to the end parts of the main bars.
As a preferable scheme of the invention, the connecting angle steel is provided with a positioning hole, and a bolt for positioning adjacent unit reinforcing steel bars is arranged in the positioning hole.
As a preferable scheme of the invention, before installing the inverted arch unit reinforcing steel bar, the step D needs to be measured and lofted to determine the end positions of the two sides of the inverted arch stage.
In a preferred embodiment of the present invention, in the process of installing the first inverted arch unit reinforcing bars and the second inverted arch unit reinforcing bars, the second inverted arch unit reinforcing bars on both sides are installed first, and then the first inverted arch unit reinforcing bars are installed, so as to form an inverted arch stage.
As a preferred embodiment of the present invention, in the step E, a water stop reservation groove is provided in the construction joint before the arch segment and the side wall segment are installed.
As a preferred embodiment of the present invention, horizontal distributing ribs are provided between the arch segments, the side wall segments and the inverted arch segments which are adjacently spliced into a ring.
The invention has the beneficial effects that compared with the prior art:
1. compared with site binding of inverted arches and two lining steel bars, the segment prefabrication and assembly mechanization degree is greatly improved, and the construction operators and the operation time in the tunnel are effectively reduced;
2. The construction precision of the steel bars is effectively improved, each unit steel bar is intensively processed on the positioning jig frame, and the steel bars can be transported to the site for use after the experience is qualified before leaving the factory, so that the qualification rate of each inspection item of the steel bars is greatly improved;
3. in order to ensure that the reinforcing steel bars of the second lining section are smoothly installed in the later period, in the primary excavation supporting construction, an operation team can pay special attention to the control of the surface flatness of underexcavation and spraying and mixing, and the phenomenon of insufficient thickness of the second lining caused by underexcavation is avoided;
4. because the unit reinforcing steel bars are connected by bolts, electric welding construction is not needed, and the phenomenon of secondary lining water seepage caused by electric welding burn of the waterproof board is avoided.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of the positioning jig;
fig. 3 is a schematic structural view of a unit reinforcing bar;
fig. 4 is a top view of the unit reinforcing bar;
FIG. 5 is an enlarged view of a portion of FIG. 4 A-A;
FIG. 6 is a schematic diagram of the connection between adjacent tunnel stages;
Reference numerals in the drawings: the steel reinforcement cage 1, shaped steel draw-in groove 2, location bolt hole 3, hunch portion unit reinforcing bar 4, side wall unit reinforcing bar 5, second inverted arch unit reinforcing bar 6, first inverted arch unit reinforcing bar 7, main muscle 8, wave-shaped connecting muscle 9, wave-shaped reinforcing bar 10, connecting muscle 11, angle 12, locating hole 13, horizontal distribution muscle 14.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 6, a method for assembling and connecting reinforcing steel bars of a tunnel concrete lining structure comprises the following steps:
step A: and manufacturing each unit positioning jig according to the size of the tunnel, designing the size of the positioning jig according to the structure of each unit reinforcing steel bar, and painting antirust paint on the positioning jig after the positioning jig is processed.
And (B) step (B): carry out preliminary processing to the reinforcing bar raw and other materials, through carrying out cold rolling bending process to the reinforcing bar raw and other materials for the reinforcing bar forms the wave, even has the reinforcing bar that the bending set up in wave reinforcing bar both sides, and the bending degree of crooked reinforcing bar designs according to the bending degree of location bed-jig, and the wave reinforcing bar sets up along the length direction of crooked reinforcing bar, and the crooked reinforcing bar parallel arrangement of both sides, and the wave reinforcing bar passes through welded connection between the crooked reinforcing bar of both sides.
Step C: and each unit steel bar is processed and formed by each positioning jig, each unit steel bar is divided into an arch unit steel bar 4, a side wall unit steel bar 5 and an inverted arch unit steel bar, each arch unit steel bar 4, each side wall unit steel bar 5 and each inverted arch unit steel bar comprise two layers of welding bodies of wave-shaped steel bars and bending steel bars which are arranged in parallel, and the bending degrees of the bending steel bars in the arch unit steel bars 4, the side wall unit steel bars 5 and the inverted arch unit steel bars are different.
Step D: and hoisting the plurality of inverted arch unit steel bars into the inverted arch foundation pit for splicing and forming to form a single inverted arch section, and positioning the inverted arch section.
Step E: side wall unit steel bars 5 are installed on two sides of the inverted arch section to form the side wall section, arch unit steel bars 4 are installed on the side wall section to form the arch section, the side wall section and the inverted arch section are spliced into a ring to form a single tunnel stage, and a settlement joint is arranged between the adjacent sections.
The positioning jig in the step A comprises a steel reinforcement framework 1, a steel clamping groove 2 and a positioning bolt hole 3, wherein the steel clamping groove 2 is positioned on the steel reinforcement framework 1, the positioning bolt hole 3 is positioned on the steel reinforcement clamping groove 2, the bending degree of the steel reinforcement framework 1 is designed according to the actual bending degree of arch unit steel bars 4, side wall unit steel bars 5 and inverted arch unit steel bars, the steel clamping groove 2 is vertically connected to the steel reinforcement framework 1, the bottom of the steel clamping groove 2 is fixedly connected with the steel reinforcement framework 1 through welding, the steel clamping groove 2 is used for supporting the position of the positioning bolt hole 3, the steel clamping groove 2 is used for propping against the side edge of the bending steel bars, the positioning bolt hole 3 is used for supporting the bending steel bars, the bottom of the bending steel bars props against the positioning bolt hole 3, a layer of welding body of wave-shaped steel bars and bending steel bars is placed on the steel reinforcement framework 1, another layer of welding body of wave-shaped steel bars and welding bodies of bending steel bars are placed on the positioning bolt hole 3, and welding bodies of the wave-shaped steel bars on the upper side and lower sides and the bending steel bars are fixed through steel bars.
And C, when each unit reinforcing steel bar is manufactured, the component members are placed in each positioning jig frame for accurate positioning, then welding processing is carried out, the arrangement direction of the plurality of section steel clamping grooves 2 is consistent with the bending degree of the unit reinforcing steel bar required to be manufactured, and the height of the positioning bolt holes 3 is consistent with the height of the unit reinforcing steel bar required to be supported.
The unit reinforcing steel bars in the step C are divided into 8 units, namely 3 arch unit reinforcing steel bars 4,2 side wall unit reinforcing steel bars 5,1 first inverted arch unit reinforcing steel bar 7 and 2 second inverted arch unit reinforcing steel bars 6.
The unit reinforcing steel bar comprises a main rib 8, a wavy connecting rib 9, a wavy reinforcing rib 10, a connecting rib 11 and connecting angle steels 12, wherein the wavy connecting rib 9, the wavy reinforcing rib 10 and the connecting rib 11 are fixedly connected to the adjacent main rib 8, and the connecting angle steels 12 are fixedly connected to the end parts of the main ribs 8.
A unit reinforcing bar includes 4 main bars 8, main bars 8 set up according to the required crooked degree of hunch portion unit reinforcing bar 4, side wall unit reinforcing bar 5 and invert unit reinforcing bar, 4 main bars 8 parallel arrangement, and 4 main bars 8 two lines two-by-two are listed as the arrangement, and two-to-two symmetry set up, wave connecting bar 9, wave reinforcing bar 10 and connecting bar 11 are located between the adjacent main bars 8, make 4 main bars 8 fixed connection under wave connecting bar 9, wave reinforcing bar 10 and connecting bar 11's effect, connecting angle steel 12 passes through welded fastening connection with two upper and lower main bars 8 simultaneously, connecting angle steel 12 is vertical to be set up on the unit reinforcing bar.
The connecting angle steel 12 is provided with the locating hole 13, the locating hole 13 is internally provided with a bolt for locating adjacent unit reinforcing steel bars, when adjacent unit reinforcing steel bars are connected, the connecting angle steel 12 is propped against each other, the locating holes 13 on the adjacent connecting angle steel 12 are corresponding, and the adjacent connecting angle steel 12 is fixedly connected under the action of the bolt, so that the fixed connection between the adjacent unit reinforcing steel bars is realized.
Step D is before installing the inverted arch unit reinforcing steel bar, needs to measure the lofting, confirms the end position of inverted arch stage both sides, and when the inverted arch unit reinforcing steel bar was installed, first inverted arch unit reinforcing steel bar 7 and second inverted arch unit reinforcing steel bar 6 installation in-process, the second inverted arch unit reinforcing steel bar 6 of installation both sides at first, then install first inverted arch unit reinforcing steel bar 7, forms the inverted arch stage.
The first inverted arch unit steel bar 7 and the second inverted arch unit steel bar 6 are located at the bottom of a tunnel, the bottoms of the first inverted arch unit steel bar 7 and the second inverted arch unit steel bar 6 are propped against the bottom of the tunnel, after the inverted arch stage is completed, the side wall unit steel bar 5 is connected to the second inverted arch unit steel bar 6, one second inverted arch unit steel bar 6 corresponds to one side wall unit steel bar 5, the side wall unit steel bar 5 is located at two sides of the tunnel, the side edges of the side wall unit steel bar 5 are propped against the inner wall of the tunnel, the bottoms of the side wall unit steel bars 5 are connected with the second inverted arch unit steel bar 6, after the side wall stage is completed, the arch unit steel bar 4 is connected to the side wall unit steel bar 5, the tops of the arch unit steel bars 4 are propped against the tops of the inner wall of the tunnel, and the bottoms of the arch unit steel bars 4 are connected with the side wall unit steel bars 5.
And E, before the arch section and the side wall section are installed, a water stop reservation groove is formed in a construction joint, a longitudinal water expansion water stop is installed between the second inverted arch unit steel bar 6 and the first inverted arch unit steel bar 7, a circumferential water expansion water stop is reserved in the construction joint, a back-attached water stop is arranged on an upstream surface, and water prevention and drainage construction is performed on a base surface before the arch section is constructed.
Horizontal distribution ribs 14 are arranged between adjacent looped arch segments, side wall segments and inverted arch segments, so that better stability is achieved between the adjacent looped arch segments, side wall segments and inverted arch segments.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the reference numerals in the figures are used more herein: the steel reinforcement cage 1, the steel clamping groove 2, the positioning bolt holes 3, the arch unit steel bars 4, the side wall unit steel bars 5, the second inverted arch unit steel bars 6, the first inverted arch unit steel bars 7, the main steel bars 8, the wavy connecting steel bars 9, the wavy reinforcing steel bars 10, the connecting steel bars 11, the connecting angle steel 12, the positioning holes 13, the horizontal distributing steel bars 14 and other terms are not excluded; these terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
Claims (8)
1. The method for connecting the tunnel concrete lining structural steel bars in an assembled mode is characterized by comprising the following steps of:
step A: according to the size of the tunnel, manufacturing each unit positioning jig, wherein the positioning jig comprises a steel reinforcement framework (1), a steel clamping groove (2) and a positioning bolt hole (3), the steel clamping groove (2) is positioned on the steel reinforcement framework (1), and the positioning bolt hole (3) is positioned on the steel clamping groove (2);
And (B) step (B): the method comprises the steps of carrying out preliminary processing on a steel bar raw material, carrying out cold rolling bending processing on the steel bar raw material to enable the steel bar to form a wave shape, connecting the steel bars which are arranged in a bending mode on two sides of the wave-shaped steel bar, designing the bending degree of the bending steel bar according to the bending degree of a positioning jig, arranging the wave-shaped steel bar along the length direction of the bending steel bar, arranging the bending steel bars on two sides in parallel, and connecting the wave-shaped steel bar between the bending steel bars on two sides through welding;
Step C: each unit steel bar is processed and formed by using each positioning jig frame, each unit steel bar is divided into an arch unit steel bar (4), a side wall unit steel bar (5) and an inverted arch unit steel bar, each unit steel bar comprises a main steel bar (8), a wavy connecting steel bar (9), a wavy reinforcing steel bar (10), connecting steel bars (11) and connecting angle steels (12), the wavy connecting steel bars (9), the wavy reinforcing steel bars (10) and the connecting steel bars (11) are fixedly connected to the adjacent main steel bars (8), the connecting angle steels (12) are fixedly connected to the end parts of the main steel bars (8), steel bars which are arranged in a bending mode are connected to two sides of each wavy steel bar, the bending degree of each wavy steel bar is designed according to the bending degree of the positioning jig frame, the wavy steel bars are arranged along the length direction of each bending steel bar, the wavy steel bars on two sides are arranged in parallel, and each wavy steel bar is connected between the bending steel bars on two sides through welding;
The bending degree of the steel reinforcement framework (1) is designed according to the actual bending degree of arch unit steel bars (4), side wall unit steel bars (5) and inverted arch unit steel bars, a section steel clamping groove (2) is vertically connected to the steel reinforcement framework (1), the bottom of the section steel clamping groove (2) is fixedly connected with the steel reinforcement framework (1) through welding, the section steel clamping groove (2) is used for supporting the position of a positioning bolt hole (3), the section steel clamping groove (2) is used for propping against the side edges of the bending steel bars, the positioning bolt hole (3) is used for supporting the bending steel bars, the bottom of the bending steel bars is propped against the positioning bolt hole (3), a layer of welding bodies of wavy steel bars and bending steel bars are placed on the steel reinforcement framework (1), and the welding bodies of the wavy steel bars and the bending steel bars on the upper side and the lower side are fixed through steel bar welding;
step D: hoisting a plurality of inverted arch unit steel bars into an inverted arch foundation pit for assembly molding to form a single inverted arch section, and positioning the inverted arch section;
Step E: side wall unit steel bars (5) are arranged on two sides of the inverted arch section to form the side wall section, arch unit steel bars (4) are arranged on the side wall section to form the arch section, the side wall section and the inverted arch section are spliced into a ring to form a single tunnel stage, and a settlement joint is arranged between the adjacent sections.
2. The method for assembling and connecting the reinforcing steel bars of the tunnel concrete lining structure according to claim 1, wherein the component members of each unit reinforcing steel bar are accurately positioned in each positioning jig frame when the unit reinforcing steel bars are manufactured in the step C, and then the welding process is performed.
3. The method for assembling and connecting the tunnel concrete lining structural reinforcements according to claim 1, wherein the unit reinforcements in the step C are divided into 8 units, namely 3 arch unit reinforcements (4), 2 side wall unit reinforcements (5), 1 first inverted arch unit reinforcement (7) and 2 second inverted arch unit reinforcements (6).
4. The method for connecting the tunnel concrete lining structural steel bars in an assembled mode according to claim 1, wherein positioning holes (13) are formed in the connecting angle steel (12), and bolts for positioning adjacent unit steel bars are arranged in the positioning holes (13).
5. The method for assembling and connecting the tunnel concrete lining structural reinforcements according to claim 1, wherein the step D is performed before installing the inverted arch unit reinforcements, and the measuring and lofting is performed to determine the end positions of both sides of the inverted arch stage.
6. A method of assembling a tunnel concrete lining construction reinforcement according to claim 3, wherein in the process of installing the first inverted arch unit reinforcement (7) and the second inverted arch unit reinforcement (6), the second inverted arch unit reinforcement (6) on both sides is installed first, and then the first inverted arch unit reinforcement (7) is installed, thereby forming an inverted arch stage.
7. The method for assembling and connecting the tunnel concrete lining structural steel bars according to claim 1, wherein in the step E, a water stop reservation groove is arranged in the construction joint before the arch section and the side wall section are installed.
8. A method of assembling a tunnel concrete lining construction steel reinforcement according to claim 1, wherein horizontal distribution bars (14) are provided between adjacent segments of the arch, side wall and inverted arch spliced into a ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910681709.5A CN110397450B (en) | 2019-07-26 | 2019-07-26 | Assembled connection method for tunnel concrete lining structure steel bars |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910681709.5A CN110397450B (en) | 2019-07-26 | 2019-07-26 | Assembled connection method for tunnel concrete lining structure steel bars |
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| CN110397450A CN110397450A (en) | 2019-11-01 |
| CN110397450B true CN110397450B (en) | 2024-07-05 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112324152A (en) * | 2020-10-30 | 2021-02-05 | 上海二十冶建设有限公司 | Construction method for accurately installing annular foundation steel reinforcement framework of rotary hearth furnace |
| CN113006833A (en) * | 2021-03-12 | 2021-06-22 | 黄河勘测规划设计研究院有限公司 | Reinforcing bar net piece connection type suitable for assembled tunnel lining |
| CN115070440B (en) * | 2022-07-19 | 2023-10-27 | 建科机械（天津）股份有限公司 | Inverted arch reinforcement cage production line |
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|---|---|---|---|---|
| CN104061004A (en) * | 2014-07-10 | 2014-09-24 | 招商局重庆交通科研设计院有限公司 | Steel bar construction for secondary lining of tunnel |
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| CN107476812A (en) * | 2017-09-27 | 2017-12-15 | 贵州省公路工程集团有限公司 | A kind of assembled inverted arch and preparation method thereof |
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