CN106337688A - Sleeved inner liner reinforcing structure for electrical operation of cable tunnel and construction method thereof - Google Patents

Sleeved inner liner reinforcing structure for electrical operation of cable tunnel and construction method thereof Download PDF

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Publication number
CN106337688A
CN106337688A CN201510407591.9A CN201510407591A CN106337688A CN 106337688 A CN106337688 A CN 106337688A CN 201510407591 A CN201510407591 A CN 201510407591A CN 106337688 A CN106337688 A CN 106337688A
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China
Prior art keywords
cable
tunnel
liner
former
arch
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Pending
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CN201510407591.9A
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Chinese (zh)
Inventor
宋超业
贺维国
王蓉蓉
赵晋友
张美琴
徐韬
赵建锋
薛超杰
王宁
杨超峰
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China Railway Liuyuan Group Co Ltd
CRTG Survey and Design Institute Co Ltd
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Priority to CN201510407591.9A priority Critical patent/CN106337688A/en
Publication of CN106337688A publication Critical patent/CN106337688A/en
Pending legal-status Critical Current

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Abstract

The invention belongs to the technical field of tunnels and underground engineering design and construction and especially relates to a sleeved inner liner reinforcing structure for electrical operation of a cable tunnel and a construction method thereof. The sleeved inner liner reinforcing structure comprises an original arch portion, an original side wall, a base plate cushion, an inverted arch, an inner liner arch portion, an inner liner side wall, a cable support, a cable and a sidewalk base plate. The construction method has following steps: (1) a middle cross arm is erected at the middle of the tunnel; (2) excavation downwards is executed to the bottom of the tunnel original base plate; (3) the structure inverted arch is cast and the sidewalk base plate is cast on the inverted arch; (4) the cable is shifted to a middle position of the tunnel; (5) a water proof layer on the original tunnel inner wall surface is laid and the inner liner arch portion and the inner liner side wall are cast with molds; (6) the cable support and the cable are reinstated and a pavement structure is cast. The invention can ensure the effective control of the strata deformation and the structural stability in the complex environment of the city, and realize the normal operation of the cable in the tunnel during the reinforcement construction stage to ensure the safety of the tunnel structure and power supply and prolong the service life of the cable tunnel.

Description

A kind of sheathed liner ruggedized construction of cable tunnel charging operation and its construction method
Technical field
The invention belongs to tunneling and underground engineering technique of design and construction field, the more particularly, to a kind of sheathed liner ruggedized construction of cable tunnel charging operation and its construction method.
Background technology
Developing rapidly with economic construction, cable system is developed rapidly.The special underground tunnel system of cable, as a kind of unique path resources, also has become as the indispensable important electric power facility of electrical network, cable system and cable tunnel play more and more important effect in electrical network.China's existing cable tunnel mostly starts to build in the later stage nineties, adopts monolayer shotcrete lining more, runs to becoming the tunnel defect high-incidence season at present, be mainly shown as structure convergent deformation, crack, percolating water and structure deterioration etc..Or, when other underground structures such as Subway Tunnel and station proximity cable tunnel construction, for ensureing cable tunnel safety, need to carry out consolidation process to it.The improvement of cable tunnel disease and neighboring tunneling are reinforced and are still in the starting stage in China, and disease incidence and producing cause are complicated, reinforce narrow space.Current disease management is mainly thought of as grouting and reinforcing water blockoff, applies the measures such as steel plate local stiffening, is difficult to disease is done with basic process it is impossible to stop disease from continuing development.
It is not affect tunnel surrounding area to power, cable all needs normally to run not power-off it is therefore desirable to take into full account the protection trouble free service of cable in work progress simultaneously.And the space ratio of cable tunnel is narrow, so will ensure that in narrow space Tunnel Repair structure safety and the not power-off of internal many telegrams in reply cable normally run simultaneously, it is the problem that cable tunnel reinforces urgent need to resolve.
Content of the invention
The cable tunnel such as disease of operation is serious or meets with neighboring tunneling, can badly influence the normal operation maintenance of cable, or even threaten tunnel safety, need to carry out consolidation process to it.The present invention considers the service requirement of cable tunnel and processes space, a kind of sheathed liner ruggedized construction of cable tunnel charging operation and its construction method are proposed, ensure that under the complex environment of city being capable of effective control stratum deformation and Stability Analysis of Structures, realize strengthening construction stage tunnel inner cable normally to run, ensure tunnel structure and power supply safety, extend cable tunnel service life.
The technical solution adopted in the present invention is: a kind of sheathed liner ruggedized construction of cable tunnel charging operation,It is characterized in that,Including former arch、Former limit wall、Bottom cushion、Inverted arch、Liner arch、Liner abutment wall、Cable bearer、Cable、Footpath base plate,The lower end both sides of described former arch are connected to form former tunnel inner wall with the upper end of described former limit wall,Described bottom cushion is located at the lower section of described former limit wall,Described inverted arch is arranged in described bottom cushion,The upper end both sides of described inverted arch are connected with the lower end of described former limit wall,Described liner arch is arranged at the inner side of described former arch,Described liner abutment wall is arranged at the inner side of described former limit wall,The upper end of described liner abutment wall is connected with described liner arch and its lower end is connected to form sheathed liner with described inverted arch,Described sheathed liner and described former tunnel inner wall、Waterproof layer is set between bottom cushion,Described cable bearer is installed on described liner abutment wall,Described erecting cable is on described cable bearer,Described footpath base plate is arranged on described inverted arch.
Described former tunnel inner wall adopts mining method construction, monolayer reinforced concrete lining layer.
Also include locking foot anchor tube, described lock foot anchor tube is piled at described former limit corner portion, described lock foot anchor tube adopts the steel pipe of diameter 42mm, every group two.
Also include middle stull, described middle stull is installed between described former limit wall and it is located at the top of described cable bearer, described middle stull is I-steel, every 3m is together.
Also include temporary cable groove box, described temporary cable groove box is arranged at the top of described footpath base plate, described temporary cable groove box is that channel-section steel, steel plate, PLASTIC LAMINATED and connecting bolt are assembled.
Also include footpath, described footpath is arranged on described footpath base plate and it is located between described cable bearer.
Described cable is high voltage supply cable, described cable carries out three faces using cable protective dividing plate and encloses covering, and described cable protective dividing plate adopts PLASTIC LAMINATED, and described cable bearer is angle steel, described sheathed inner lining structure is 250mm thickness reinforced concrete structure, and described bottom cushion is 200mm thickness c15 concrete.
Described waterproof layer includes ecb splash guard, non-woven fabrics, and described ecb splash guard is fitted described former tunnel inner wall, bottom cushion setting, the described sheathed liner setting of described non-woven fabrics laminating.
A kind of construction method of the sheathed liner ruggedized construction of cable tunnel charging operation is it is characterised in that comprise the following steps:
(1) set up middle stull in the middle part of tunnel, set lock foot anchor tube grouting and reinforcing, carry out cable protective;
(2) cut the former underplate concrete in tunnel and reinforcing bar, be excavated to downwards the former bottom base plate in tunnel;
(3) waterproof layer applying bottom cushion and being located at bottom cushion surface, assembling reinforcement, pouring structure inverted arch, inverted arch pours footpath base plate;
(4) after tunnel former bottom board replacing in all fronts finishes, by cable displacement to tunnel medium position, cable is carried out with parcel protection;
(5) waterproof layer on former tunnel inner wall surface, assembling reinforcement are laid, mould builds liner arch, liner abutment wall;
(6) recover cable bearer and cable, pour structure of sidewalk.
In described step (2), cutting of the former base plate in tunnel adopts job-hopping section construction.
The invention has the benefit that
1st, a kind of sheathed liner ruggedized construction of cable tunnel charging operation of the present invention and construction method, it is possible to achieve the strengthening construction under the powered ruuning situation of weak surrounding rock tunneling cable tunnel cable, sheathed inner lining structure is reasonable in design, good stability, good endurance;
2nd, structural support system is simple, makes full use of existing structure, no abandoned project amount;
3rd, when existing tunnel base plate is abolished with new work liner inverted arch; cable is enclosed using PLASTIC LAMINATED three face and covers; after the completion of the construction of liner inverted arch; cable is moved to temporary cable groove box inner sealing protection above inverted arch; internal setting monitoring device can ensure the normal charging operation of construction stage cable it is ensured that cable is not subject to construction damage;
4th, all using smoother domes, structural bearing capacity is strong, and waterproof quality is good for sheathed liner ruggedized construction arch, base plate and bed course;
5th, engineering method process is simple, easy to operate, can well control stratum deformation using measures such as temporary support, lock foot anchor tube slip castings, improve work efficiency, save construction costs;
6, the invention provides the reinforcing of a kind of operation cable tunnel or similar municipal pipeline or maintenance supporting construction form, the combination application of the multinomial technology of construction method and innovation, sheathed inner lining structure reasonable stress, architecture quality and good endurance, construction procedure is simple and progress of implementation is fast, the normal charging operation safety of achievable inside cable, solve little space strengthening construction difficult poor with strengthening quality, in digging process, stratum deformation is larger, cable needs power failures block supply, many difficult problems such as construction safety risk is big, preferably expand the application space of Tunnel Repair reinforcement construction technology, extend cable tunnel service life.
Brief description
Fig. 1 is the middle reinforcing front-end geometry contrast schematic diagram of the present invention;
Fig. 2 is the construction schematic diagram cutting former base plate in the present invention;
Fig. 3 is the construction schematic diagram of inverted arch in the present invention;
Fig. 4 is the construction schematic diagram changing shift cable in the present invention;
Fig. 5 is the construction schematic diagram of liner arch and liner abutment wall in the present invention;
Fig. 6 is the construction schematic diagram recovering cable bearer and cable of the present invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings:
In figure, the former arch of 1-, 2- former limit wall, the former base plate of 3-, 4- cable, 5- cable bearer, 6- temporary cable groove box, 7- liner arch, 8- liner abutment wall, 9- inverted arch, stull in the middle of 10-, 11- bottom cushion, 12- waterproof layer, 13- footpath base plate, the former tunnel inner wall of 14-, the sheathed liner of 15-, 16- non-woven fabrics, 17- footpath, 18- cable protective dividing plate, 19- ecb splash guard, 20- locks foot anchor tube, 21- channel-section steel, 22- connecting bolt, 23- steel plate, 24- PLASTIC LAMINATED.
Embodiment
As shown in figures 1 to 6,A kind of sheathed liner ruggedized construction of cable tunnel charging operation,Including former arch 1、Former limit wall 2、Bottom cushion 11、Inverted arch 9、Liner arch 7、Liner abutment wall 8、Cable bearer 5、Cable 4、Footpath base plate 13,The lower end both sides of former arch 1 and the upper end of former limit wall 2 are connected to form former tunnel inner wall 14,Bottom cushion 11 is located at the lower section of former limit wall 2,Inverted arch 9 is arranged in bottom cushion 11,The upper end both sides of inverted arch 9 are connected with the lower end of former limit wall 2,Liner arch 7 is arranged at the inner side of former arch 1,Liner abutment wall 8 is arranged at the inner side of former limit wall 2,The upper end of liner abutment wall 8 is connected with liner arch 7 and its lower end is connected to form sheathed liner 15 with inverted arch 9,Sheathed liner 15 and former tunnel inner wall 14、Waterproof layer 12 is set between bottom cushion 11,Cable bearer 5 is installed on liner abutment wall 8,Cable 4 is set up on cable bearer 5,Footpath base plate 13 is arranged on inverted arch 9.
Cable tunnel is the tunnel of mining method construction, monolayer reinforced concrete lining layer, and including former arch 1, former limit wall 2 and former base plate 3 structure, ruggedized construction adopts inverted arch 9 structure, and inverted arch 9 is located at the lower section of former base plate 3.
Former tunnel inner wall 14 adopts mining method construction, monolayer reinforced concrete lining layer.
Lock foot anchor tube 20 is piled at former limit wall 2 corner, using the steel pipe of diameter 42mm, mono- group of every 3m, and every group two, every 2m length.
Also include middle stull 10, middle stull 10 is installed between former limit wall 2 and it is located at the top of cable bearer 5, middle stull 10 is I-steel, together, setting movable end can compress every 3m.
Also include temporary cable groove box 6, temporary cable groove box 6 is arranged at the top of footpath base plate 13, temporary cable groove box 6 is that channel-section steel 21, steel plate 23, PLASTIC LAMINATED 24 and connecting bolt 22 are assembled.
Also include footpath 17, footpath 17 is arranged on footpath base plate 13 and it is located between cable bearer 5.
Cable 4 is the high voltage supply cable of 220kv and 66kv, can shift after power-off, and cable 4 carries out three faces using cable protective dividing plate 18 and enclose covering, and cable protective dividing plate 18 adopts PLASTIC LAMINATED.
Cable bearer 5 is angle steel, repeats processing and utilization after dismounting, and sheathed liner 15 structure is 250mm thickness reinforced concrete structure, and bottom cushion 11 is 200mm thickness c15 concrete.
Waterproof layer 12 adopts 2mm thickness ecb splash guard 19,400g/m2Non-woven fabrics 16, fit former tunnel inner wall 14, bottom cushion 11 of ecb splash guard 19 is arranged, and non-woven fabrics 16 sheathed liner 15 of fitting is arranged.
As shown in figures 1 to 6, the construction method of the sheathed liner ruggedized construction of a kind of cable tunnel charging operation, comprises the following steps:
(1) set up middle stull 10 in the middle part of tunnel, set lock foot anchor tube 20 grouting and reinforcing, carry out cable 4 and protect;
(2) cut the former base plate in tunnel 3 concrete and reinforcing bar, be excavated to downwards the former base plate in tunnel 3 bottom;
(3) waterproof layer 12 applying bottom cushion 11 and being located at bottom cushion 11 surface, assembling reinforcement, pouring structure inverted arch 9, inverted arch 9 pours footpath base plate 13;
(4) after the former base plate in all fronts tunnel 3 is changed and finished, cable 4 is displaced to tunnel medium position, cable 4 is carried out with parcel protection;
(5) waterproof layer 12 on former tunnel inner wall 14 surface, assembling reinforcement are laid, mould builds liner arch 7, liner abutment wall 8;
(6) recover cable bearer 5 and cable 4, cable bearer 5 is installed on liner abutment wall 8, cable 4 is fixed on cable bearer 5, pours footpath 17 structure.
In step (2), cutting of the former base plate in tunnel 3 adopts job-hopping section construction.
As shown in figures 1 to 6, Specific construction step is as follows:
(1) before the former base plate in tunnel 3 abolishes excavation, stull 10 in the middle of setting i22b@500 I-steel level in tunnel, it is supported in tunnel former limit wall 2, and support is reinforced to cable bearer 5 top steel pipe plus screw thread, in barrel former limit wall 2, lock foot anchor tube 20 is set, anchor tube injecting paste material adopts cement-silicate dual slurry, carries out three faces as cable protective dividing plate 18 to all fronts tunnel cable 4 and cable bearer 5 with double-deck PLASTIC LAMINATED and encloses, in case having foreign object or external force to injure cable in work progress;
(2) after tunnel reinforcement supporting, carry out the former base plate in tunnel 3 abolishes excavation, carries out section construction of job-hoping, every time nine meters of length of construction (3 sections × 3 meters);The former base plate in tunnel 3 cast-in-situ steel reinforced concrete, abolish and need to be abolished with pneumatic pick or electric pick, after abolishing, the reinforcing bar in strained for former tunnel former base plate 3 structure is cut off, adopt grouting and reinforcing water blockoff in former base plate 3 and former limit wall 2, ensure anhydrous construction operation, and will be with excavating setting intercepting ditch, sump, each sump arranges two mud suction pumps it is ensured that the anhydrous operation of the scope of operation;As found excavation face built on the sand after excavation, using jetting cement or sand finish, excavation face is carried out with gib levelling in time, and apply the waterproof layer 12 on bottom cushion 11 and bottom cushion 11 in time;
(3) fish tail and waterproof layer non-woven fabrics 16 will be applied after applying the waterproof layer 12 on bottom cushion 11 immediately; overlying cement mortar; colligation inverted arch 9 reinforcing bar; because electric welding can not be applied in tunnel; the all splices in tunnel carry out colligation, after steel corrosion quantity, a vertical reinforcing end head formwork, arcuate bottom template die and short sidewall template; pour inverted arch 9 concrete, inverted arch 9 pours footpath base plate 13;
(4) after the former base plate in tunnel 3 strengthening construction terminates; have a power failure one by one from bottom to top; cable 4 is displaced downwardly in tunnel ground temporary cable groove box 6 after reinforcing, temporary cable groove box 6 is protected by using 180 channel-section steels 21, steel plate 23, PLASTIC LAMINATED 24 etc., after being protected by, recovers transmission operation;
(5) waterproof layer 12 on former tunnel inner wall 14 surface, assembling reinforcement are laid, mould builds liner arch 7, liner abutment wall 8, sheathed liner 15 adopts lining template trolley for baffle to construct, and pumped commercial concrete enters mould and pours, and plug-in type vibrator is made firm by ramming, natural curing;Sheathed liner 15 structural concrete strength reaches design strength and carries out back filling slip casting in time;
(6) carry out cable after the completion of cable bearer 5 and recover construction, footpath base plate 13 pours structure of sidewalk.
Present configuration and engineering method are applied to reinforcing and the construction of cable tunnel, should strictly control cutting depth in construction.
Above 1 embodiment of the present invention is described in detail, but content has been only presently preferred embodiments of the present invention it is impossible to be considered the practical range for limiting the present invention.All impartial changes made according to the present patent application scope and improvement etc., all should still belong within the patent covering scope of the present invention.

Claims (10)

1. the sheathed liner ruggedized construction of a kind of cable tunnel charging operation,It is characterized in that,Including former arch、Former limit wall、Bottom cushion、Inverted arch、Liner arch、Liner abutment wall、Cable bearer、Cable、Footpath base plate,The lower end both sides of described former arch are connected to form former tunnel inner wall with the upper end of described former limit wall,Described bottom cushion is located at the lower section of described former limit wall,Described inverted arch is arranged in described bottom cushion,The upper end both sides of described inverted arch are connected with the lower end of described former limit wall,Described liner arch is arranged at the inner side of described former arch,Described liner abutment wall is arranged at the inner side of described former limit wall,The upper end of described liner abutment wall is connected with described liner arch and its lower end is connected to form sheathed liner with described inverted arch,Described sheathed liner and described former tunnel inner wall、Waterproof layer is set between bottom cushion,Described cable bearer is installed on described liner abutment wall,Described erecting cable is on described cable bearer,Described footpath base plate is arranged on described inverted arch.
2. a kind of sheathed liner ruggedized construction of cable tunnel according to claim 1 charging operation it is characterised in that: described former tunnel inner wall adopts mining method construction, monolayer reinforced concrete lining layer.
3. a kind of sheathed liner ruggedized construction of cable tunnel according to claim 1 charging operation it is characterised in that: also include locking foot anchor tube, described lock foot anchor tube is piled at described former limit corner portion, described lock foot anchor tube adopts the steel pipe of diameter 42mm, every group two.
4. the sheathed liner ruggedized construction of a kind of cable tunnel according to claim 1 charging operation, it is characterized in that: also include middle stull, described middle stull is installed between described former limit wall and it is located at the top of described cable bearer, and described middle stull is I-steel, and every 3m is together.
5. the sheathed liner ruggedized construction of a kind of cable tunnel according to claim 1 charging operation, it is characterized in that: also include temporary cable groove box, described temporary cable groove box is arranged at the top of described footpath base plate, and described temporary cable groove box is that channel-section steel, steel plate, PLASTIC LAMINATED and connecting bolt are assembled.
6. a kind of sheathed liner ruggedized construction of cable tunnel according to claim 1 charging operation it is characterised in that: also include footpath, described footpath be arranged on described footpath base plate and its be located at described cable bearer between.
7. the sheathed liner ruggedized construction of a kind of cable tunnel according to claim 1 charging operation, it is characterized in that: described cable is high voltage supply cable, described cable carries out three faces using cable protective dividing plate and encloses covering, described cable protective dividing plate adopts PLASTIC LAMINATED, described cable bearer is angle steel, described sheathed inner lining structure is 250mm thickness reinforced concrete structure, and described bottom cushion is 200mm thickness c15 concrete.
8. the sheathed liner ruggedized construction of a kind of cable tunnel according to claim 1 charging operation, it is characterized in that: described waterproof layer includes ecb splash guard, non-woven fabrics, described ecb splash guard is fitted described former tunnel inner wall, bottom cushion setting, the described sheathed liner setting of described non-woven fabrics laminating.
9. a kind of construction method of the sheathed liner ruggedized construction of cable tunnel charging operation is it is characterised in that comprise the following steps:
(1) set up middle stull in the middle part of tunnel, set lock foot anchor tube grouting and reinforcing, carry out cable protective;
(2) cut the former underplate concrete in tunnel and reinforcing bar, be excavated to downwards the former bottom base plate in tunnel;
(3) waterproof layer applying bottom cushion and being located at bottom cushion surface, assembling reinforcement, pouring structure inverted arch, inverted arch pours footpath base plate;
(4) after tunnel former bottom board replacing in all fronts finishes, by cable displacement to tunnel medium position, cable is carried out with parcel protection;
(5) waterproof layer on former tunnel inner wall surface, assembling reinforcement are laid, mould builds liner arch, liner abutment wall;
(6) recover cable bearer and cable, pour structure of sidewalk.
10. a kind of sheathed liner ruggedized construction of cable tunnel according to claim 9 charging operation construction method it is characterised in that: in described step (2), the former base plate in tunnel cut using job-hopping section construction.
CN201510407591.9A 2015-07-13 2015-07-13 Sleeved inner liner reinforcing structure for electrical operation of cable tunnel and construction method thereof Pending CN106337688A (en)

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CN201510407591.9A CN106337688A (en) 2015-07-13 2015-07-13 Sleeved inner liner reinforcing structure for electrical operation of cable tunnel and construction method thereof

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109217185A (en) * 2018-09-07 2019-01-15 成都市工业设备安装公司 The method for not powering off safety transfer for ensuring sewage treatment plant's cable
CN111396077A (en) * 2020-03-10 2020-07-10 北京市政建设集团有限责任公司 Tunnel air duct secondary lining construction method
CN111817199A (en) * 2020-06-23 2020-10-23 中国五冶集团有限公司 Construction method for changing electric U-shaped groove into calandria

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Publication number Priority date Publication date Assignee Title
CN202914109U (en) * 2012-08-20 2013-05-01 中铁十三局集团第三工程有限公司 Integral type lining system of light-section cable tunnel
CN203412598U (en) * 2013-06-20 2014-01-29 沈阳电力勘测设计院 Cable-tunnel composite lining waterproof structure
CN203822328U (en) * 2014-02-27 2014-09-10 河北省电力勘测设计研究院 Cable tunnel lining structure
CN104265324A (en) * 2014-08-06 2015-01-07 上海隧道工程有限公司 Existing tunnel structure reinforced composite component reinforcing structure and construction method of existing tunnel structure reinforced composite component reinforcing structure
CN204738818U (en) * 2015-07-13 2015-11-04 中铁第六勘察设计院集团有限公司 Inside lining reinforced structure is established to electrified operation cover of cable tunnel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202914109U (en) * 2012-08-20 2013-05-01 中铁十三局集团第三工程有限公司 Integral type lining system of light-section cable tunnel
CN203412598U (en) * 2013-06-20 2014-01-29 沈阳电力勘测设计院 Cable-tunnel composite lining waterproof structure
CN203822328U (en) * 2014-02-27 2014-09-10 河北省电力勘测设计研究院 Cable tunnel lining structure
CN104265324A (en) * 2014-08-06 2015-01-07 上海隧道工程有限公司 Existing tunnel structure reinforced composite component reinforcing structure and construction method of existing tunnel structure reinforced composite component reinforcing structure
CN204738818U (en) * 2015-07-13 2015-11-04 中铁第六勘察设计院集团有限公司 Inside lining reinforced structure is established to electrified operation cover of cable tunnel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109217185A (en) * 2018-09-07 2019-01-15 成都市工业设备安装公司 The method for not powering off safety transfer for ensuring sewage treatment plant's cable
CN109217185B (en) * 2018-09-07 2020-11-06 成都建工工业设备安装有限公司 Method for ensuring safe transfer of sewage treatment plant cable without power failure
CN111396077A (en) * 2020-03-10 2020-07-10 北京市政建设集团有限责任公司 Tunnel air duct secondary lining construction method
CN111817199A (en) * 2020-06-23 2020-10-23 中国五冶集团有限公司 Construction method for changing electric U-shaped groove into calandria

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Application publication date: 20170118