CN211500701U - Long and large highway tunnel efflux fan installing support - Google Patents
Long and large highway tunnel efflux fan installing support Download PDFInfo
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- CN211500701U CN211500701U CN201922358170.8U CN201922358170U CN211500701U CN 211500701 U CN211500701 U CN 211500701U CN 201922358170 U CN201922358170 U CN 201922358170U CN 211500701 U CN211500701 U CN 211500701U
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Abstract
The utility model belongs to the technical field of tunnel traffic engineering, and relates to a jet fan mounting bracket for a long and large highway tunnel, which comprises an arc-shaped upright post, a top cross beam and a fan positioning clip; the arc-shaped upright column is arranged on the side wall of the tunnel secondary lining; the arc-shaped upright posts comprise first upright posts and second upright posts opposite to the first upright posts; the first upright post is connected with the second upright post through the top cross beam; a jet fan accommodating cavity is formed between the top cross beam and the tunnel secondary lining; the fan positioning clamp is arranged on the top cross beam and fixes the jet fan on the top cross beam. The utility model discloses make full use of the upper portion space of tunnel building boundary limit, provide a convenient, the reliable performance's of construction efflux fan support when addding the efflux fan during the highway tunnel operation of growing up. In case the fan breaks down during the operation, this support can provide the operation platform again, has the advantage of overhauing conveniently, flexible operation.
Description
Technical Field
The utility model belongs to the technical field of tunnel traffic engineering, a highway tunnel efflux fan installing support grows up is related to, especially, relate to an installing support of efflux fan that is applicable to the long big highway tunnel of operation and adds.
Background
The current tunnel operation ventilation adopts the longitudinal ventilation mode of the jet fan, the jet fan is hung on the vault of the tunnel mostly, a small number of jet fans are hung on the side wall through embedded parts, the installation difficulty is large, the overhauling operation is complex, the falling risk exists, and the embedded parts are also very inconvenient in the construction of tunnel secondary lining concrete. The rapid development of national economy has larger and larger demand on transportation, the construction of extra-long tunnels and super-extra-long tunnels with the length of more than 10 kilometers is more and more, and the ventilation problem in the operation period of long and large tunnels is not well solved all the time. Especially, in the expressway tunnel with many large diesel transport vehicles, the air in the tunnel is dirty, the content of harmful gas exceeds the standard, and the number of jet fans adopted in the longitudinal ventilation mode designed according to the factors such as the size of traffic volume, traffic composition and the like in the tunnel construction period can not meet the ventilation requirement in the operation period.
The patent CN103883344A of the disclosed invention provides a lateral tunnel fan erecting device, so that the installation of a jet fan in a tunnel is safer, more convenient and firmer. However, the section of the tunnel at the position where the fan is arranged needs to be properly enlarged, then the floor type fan foundation platform is made of profile steel, and the floor type fan foundation platform is welded with a steel plate pre-embedded in secondary lining concrete in the lateral direction, so that the stability of the fan during operation is ensured.
If the secondary lining section of the operated long and large highway tunnel is properly enlarged and then the jet fan disclosed by the invention patent CN103883344A is laterally installed, the following problems exist: firstly, the secondary lining section is difficult to expand properly, the manufacturing cost is high, the method is not economical, the operation is complex, and the possibility of the operation is very low. Secondly, after the section is properly enlarged, the jet fan is difficult to ensure that no part is required to be invaded in the tunnel building boundary required by the specification, and the ventilation requirement is difficult to ensure to a certain extent, and the cable layout problem of the jet fan is not mentioned in the invention patent CN 103883344A.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-mentioned technical problem who exists among the background art, the utility model provides a can ensure driving safety, construction convenience and dependable performance's highway tunnel efflux fan installing support of growing up.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a highway tunnel efflux fan installing support grows up which characterized in that: the jet fan mounting bracket for the long and large highway tunnel comprises an arc-shaped upright post, a top cross beam and a fan positioning clip; the arc-shaped upright column is arranged on the side wall of the tunnel secondary lining; the arc-shaped upright posts comprise first upright posts and second upright posts opposite to the first upright posts; the first upright post is connected with the second upright post through the top cross beam; a jet fan accommodating cavity is formed between the top cross beam and the tunnel secondary lining; the fan positioning clamp is arranged on the top cross beam and fixes the jet fan on the top cross beam.
Preferably, the number of the arc-shaped upright posts adopted by the utility model is corresponding to that of the top cross beams; the arc-shaped upright posts and the top cross beam are all provided with a plurality of arc-shaped upright posts; many arc stand columns and many top crossbeams form holistic frame construction, frame construction sets up along the axial in tunnel.
Preferably, the jet fan mounting bracket for the long and large highway tunnel adopted by the utility model also comprises a top cross beam connecting steel strip which is arranged along the axial direction of the tunnel and is used for connecting a plurality of top cross beams; the top cross beams are connected with the steel belt through the top cross beams to form an integral frame structure.
Preferably, the fan positioning clip adopted by the utility model is in omega shape as a whole; the fan positioning clip is formed by winding a steel belt; the width of the fan positioning clamp is the same as that of the top cross beam; fan positioning clamp wing lugs are respectively arranged at two end parts of the fan positioning clamp along the length direction of the fan positioning clamp; a positioning clamp lug reserved bolt hole is formed in the fan positioning clamp lug; a reserved bolt is arranged on the reserved bolt hole of the lug of the positioning clip; the fan positioning clamp is clamped outside the jet fan and then fixedly connected with the top cross beam through a reserved bolt.
Preferably, the first upright and the second upright adopted by the utility model both comprise H-shaped steel and a steel backing plate welded on the H-shaped steel; the section of the integral structure formed by welding the H-shaped steel and the steel backing plate is rectangular; the H-shaped steel of the first upright post is connected with the H-shaped steel of the second upright post through the top cross beam.
Preferably, the two end parts of the top beam adopted by the utility model are respectively provided with a connecting sheet; the steel base plate of the first upright post is connected with the top cross beam through a connecting sheet; and the top cross beam is connected with the steel base plate of the second upright post through a connecting sheet.
Preferably, the steel backing plate adopted by the utility model comprises a steel backing plate reserved bolt hole and a steel backing plate reserved threading hole; reserved bolts are arranged on the reserved bolt holes of the steel base plate; and the steel base plate of the first upright post is fixedly connected with the connecting piece through a reserved bolt.
Preferably, the top cross beam adopted by the utility model is the same H-shaped steel as the first upright post or the second upright post; and a top cross beam reserved threading hole is formed in the top cross beam.
Preferably, the jet fan mounting bracket for the long and large highway tunnel adopted by the utility model also comprises an arc-shaped upright positioning clip which is arranged outside the first upright and the second upright and is fixedly connected with the tunnel secondary lining; the arc-shaped upright post positioning clip is in a shape like a Chinese character 'ji', and upright post positioning clip wing lugs are arranged at the two end parts of the arc-shaped upright post positioning clip along the length direction of the arc-shaped upright post positioning clip; a lug reserved bolt hole is formed in each lug of the column positioning clamp; be provided with expansion bolts on the tab reservation bolt hole, arc stand column positioning clip card is held and is passed through expansion bolts and tunnel secondary lining fixed connection after first stand and second stand outside.
Compared with the prior art, the utility model, have following advantage and beneficial effect:
the utility model provides a jet fan mounting bracket for a long and large highway tunnel, which comprises an arc-shaped upright post, a top cross beam and a fan positioning clip; the arc-shaped upright column is arranged on the side wall of the tunnel secondary lining; the arc-shaped upright posts comprise first upright posts and second upright posts opposite to the first upright posts; the first upright post is connected with the second upright post through the top cross beam; a jet fan accommodating cavity is formed between the top cross beam and the tunnel secondary lining; the fan positioning clamp is arranged on the top cross beam and fixes the jet fan on the top cross beam. The mounting bracket for the jet fan of the long and large highway tunnel provided by the utility model has the advantages that firstly, the problem that the lateral tunnel fan erecting device is easy to intrude into the tunnel building clearance is avoided, and the driving safety is ensured; secondly, the problem that the secondary lining section of the tunnel is properly enlarged when the lateral tunnel fan is erected is avoided. The blower support fully utilizes the upper space of the tunnel building limit, and provides a jet blower support which is convenient to construct and reliable in performance when a jet blower is additionally arranged in a long tunnel during operation. In case the fan breaks down during the operation, this support can provide the operation platform again, has the advantage of overhauing conveniently, flexible operation.
Drawings
Fig. 1 is a schematic front view of a jet fan bracket provided by the present invention;
FIG. 2 is a schematic cross-sectional view of an arc-shaped upright used in the present invention;
FIG. 3 is a schematic structural view of an arc-shaped pillar positioning clip used in the present invention;
FIG. 4 is a schematic structural view of a fan positioning clip of the present invention;
FIG. 5 is a schematic view of the cross-sectional structure A-A of FIG. 1;
fig. 6 is a schematic top perspective view of a jet fan support provided by the present invention;
wherein:
1-H section steel; 2-a steel backing plate; 21-reserving bolt holes in the steel backing plate; 22-a threading hole is reserved in the steel backing plate; 3-arc column positioning clip; 31-column positioning clip tab; 32-reserving bolt holes on the lug; 4-a top cross beam; 41-a threading hole is reserved in the top cross beam; 5, connecting a top cross beam with a steel belt; 6-a fan positioning clip; 61-fan positioning clip lug; 62-reserving bolt holes in the wing lugs of the positioning clips; 7-jet flow fan; 8-tunnel construction limits; 9-secondary lining.
Detailed Description
The utility model provides a jet fan mounting bracket for a long and large highway tunnel, which comprises an arc-shaped upright post, a top cross beam 4 and a fan positioning clip 6; the arc-shaped upright column is arranged on the side wall of the tunnel secondary lining 9; the arc-shaped upright posts comprise first upright posts and second upright posts opposite to the first upright posts; the first upright post is connected with the second upright post through a top cross beam 4; a jet fan 7 accommodating cavity is formed between the top cross beam 4 and the tunnel secondary lining 9; the fan positioning clip 6 is placed on the top cross beam 4 and fixes the jet fan 7 on the top cross beam 4.
The number of the arc-shaped upright posts corresponds to that of the top cross beams 4; the arc-shaped upright posts and the top cross beam 4 are all provided with a plurality of arc-shaped upright posts; a plurality of arc-shaped upright posts and a plurality of top cross beams 4 form an integral frame structure, and the frame structure is arranged along the axial direction of the tunnel. The jet fan mounting bracket for the long and large highway tunnel further comprises a top cross beam connecting steel strip 5 which is arranged along the axial direction of the tunnel and used for connecting a plurality of top cross beams 4; and a plurality of top cross beams 4 are connected with the steel strip 5 through the top cross beams to form an integral frame structure. The fan positioning clip 6 is integrally omega-shaped; the fan positioning clip 6 is formed by winding a steel belt; the width of the fan positioning clamp 6 is the same as that of the top cross beam 4; fan positioning clip wing lugs 61 are respectively arranged at the two end parts of the fan positioning clip 6 along the length direction of the fan positioning clip 6; a positioning clamp lug reserved bolt hole 62 is formed in the fan positioning clamp lug 61; a reserved bolt is arranged on the positioning clip lug reserved bolt hole 62; the fan positioning clamp 6 is clamped outside the jet fan 7 and then is fixedly connected with the top cross beam 4 through a reserved bolt.
The first upright post and the second upright post respectively comprise H-shaped steel 1 and a steel backing plate 2 welded on the H-shaped steel 1; the section of the integral structure after the H-shaped steel 1 and the steel backing plate 2 are welded is rectangular; the H-shaped steel 1 of the first upright is connected with the H-shaped steel 1 of the second upright through a top cross beam 4. Connecting sheets are respectively arranged at the two end parts of the top cross beam 4; the steel backing plate 2 of the first upright post is connected with the top cross beam 4 through a connecting sheet; the top cross beam 4 is connected with the steel backing plate 2 of the second upright post through a connecting sheet. The steel backing plate 2 comprises a steel backing plate reserved bolt hole 21 and a steel backing plate reserved threading hole 22; reserved bolts are arranged on the reserved bolt holes 21 of the steel base plate; the steel backing plate 2 of the first upright post is fixedly connected with the connecting piece through a reserved bolt. The top cross beam 4 is H-shaped steel which is the same as the first upright post or the second upright post; the top cross beam 4 is provided with a top cross beam reserved threading hole 41.
The mounting bracket for the jet fan of the long and large highway tunnel further comprises an arc-shaped upright positioning clip 3 which is arranged outside the first upright and the second upright and fixedly connected with the tunnel secondary lining 9; the arc-shaped upright post positioning clip 3 is in a shape like a Chinese character 'ji', and upright post positioning clip wing lugs 31 are arranged at the two end parts of the arc-shaped upright post positioning clip 3 along the length direction of the arc-shaped upright post positioning clip 3; the lug reserved bolt hole 32 is formed in the lug 31 of the column positioning clamp; expansion bolts are arranged on the lug reserved bolt holes 32, and the arc-shaped upright post positioning clips 3 are clamped outside the first upright post and the second upright post and then fixedly connected with the tunnel secondary lining 9 through the expansion bolts.
The utility model provides a highway tunnel efflux fan installing support grows up's concrete mounting means is:
1) manufacturing an arc-shaped upright post according to the inner contour form of the tunnel secondary lining 9, and fixing the arc-shaped upright post on the tunnel secondary lining 9 through an arc-shaped upright post positioning clip 3;
2) welding a top cross beam 4 with the H-shaped steel 1 of the arc-shaped upright column, and connecting the top cross beam 4 longitudinally arranged along the tunnel by using a top cross beam connecting steel strip 5;
3) fixing a jet fan 7 on the top cross beam 4 by adopting an omega-shaped fan positioning clip 6;
4) the power cord that supplies power for jet fan 7 upwards arranges along the edge of a wing inboard of the H shaped steel 1 of arc stand from the tunnel both sides cable pit, passes and continues upwards to arrange to top beam 4 after reserving line hole 22 on the steel backing plate 2, lays along the edge of a wing of top beam 4, reserves through wires hole 41 through the top beam that top beam 4 reserved after, directly supplies power for jet fan 7, ensures its normal work.
The technical solution provided by the present invention will be described in detail below with reference to the accompanying drawings:
referring to fig. 1-6, the utility model provides a highway tunnel efflux fan installing support grows up, this highway tunnel efflux fan installing support grows up comprises mainly five major components of both sides arc stand, arc stand positioning clip 3, top end rail 4, top end rail connection steel band 5 and fan positioning clip 6. The arc-shaped upright columns on two sides are formed by bending the H-shaped steel 1, the number of the adopted H-shaped steel 1 is determined according to the inner contour line of a lining of two lanes, three lanes or four lanes, and the integral bending form after the H-shaped steel 1 is assembled is the same as the form of a secondary lining of the tunnel. Both ends of H shaped steel 1 all are provided with steel backing plate 2, and the length and the width of steel backing plate 2 are the same with H shaped steel 1's web height and edge of a wing width to adopt and ride seam welding, ensure that the welding seam is full, must not leave the sand hole etc. guarantee that steel backing plate 2 is connected reliably with H shaped steel 1. The steel backing plate 2 at the end of the H-shaped steel 1 is connected through bolts, and then the arc-shaped upright posts are assembled.
Arc stand locator card 3 is several types of characters, adopts the steel material that has 5mm thickness to make to arc stand locator card 3's inside groove width is the same with H shaped steel 1's edge of a wing width, and two bolt holes are all reserved to arc stand locator card 3's both sides alar ear, and is fixed through expansion bolts and side wall secondary lining structure. Arc stand location checkpost 3 sets up along the H shaped steel 1 interval certain distance that bends into specific shape, especially can set up in the junction of H shaped steel 1, and its effect can fix the arc stand on one hand, secondly plays pleasing to the eye effect, guarantees not to see the bolt of H shaped steel concatenation department.
The top cross beam 4 adopts the same type of H-shaped steel, and certain measures are adopted to ensure that the top cross beam 4 is firmly connected with the arc-shaped upright columns on the two sides. Set up 3 arc stand and top crossbeam 4 at the tunnel is vertical to adopt the connection steel sheet to couple together top crossbeam 4 at the tunnel is vertical, play fixed crossbeam's effect, ensure that jet fan during operation is stable, do not take place the phenomenon that top crossbeam trembles.
After the jet fan is in place, the fan is fixed on the top cross beam 4 by the fan positioning clamp 6, the fan positioning clamp 6 is in an omega shape and made of a steel belt with certain thickness, the width of the steel belt is the same as that of the flange of the top cross beam 4, two ends of the fan positioning clamp 6 are provided with wing lugs with certain length, bolt holes are formed in the wing lugs, the wing lugs are matched with reserved bolt holes of the top cross beam 4, and the fan is fixed through bolts. All set up on the three crossbeam that sets up along tunnel vertically and adopt fan location checkpost 6, can be with firmly fixing the fan on the top crossbeam like this. Two threading holes are formed in the top cross beam, and the power supply is used when the fan works normally. The power cord can upwards arrange along the edge of a wing inboard of arc stand from tunnel both sides cable pit, when meetting the connection end plate of H shaped steel, through the reserve line hole on connecting the end plate can, then continue upwards to arrange to the top beam, lay along the edge of a wing of top beam, through the through wires hole that the top beam was reserved after, directly give the fan power supply, ensure its normal work.
The above-mentioned embodiment is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent changes and approximate replacements made according to the claims of the present invention should fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a highway tunnel efflux fan installing support grows up which characterized in that: the jet fan mounting bracket for the long and large highway tunnel comprises an arc-shaped upright post, a top cross beam (4) and a fan positioning clip (6); the arc-shaped upright posts are arranged on the side wall of the tunnel secondary lining (9); the arc-shaped upright posts comprise first upright posts and second upright posts opposite to the first upright posts; the first upright post is connected with the second upright post through a top cross beam (4); a jet fan (7) accommodating cavity is formed between the top cross beam (4) and the tunnel secondary lining (9); the fan positioning clip (6) is arranged on the top cross beam (4) and fixes the jet fan (7) on the top cross beam (4).
2. The long and large highway tunnel jet fan mounting bracket of claim 1, characterized in that: the number of the arc-shaped upright posts corresponds to that of the top cross beams (4); the arc-shaped upright posts and the top cross beam (4) are all provided with a plurality of arc-shaped upright posts; a plurality of arc-shaped upright columns and a plurality of top cross beams (4) form an integral frame structure, and the frame structure is arranged along the axial direction of the tunnel.
3. The long and large highway tunnel jet fan mounting bracket of claim 2, characterized in that: the jet fan mounting bracket for the long and large highway tunnel further comprises a top cross beam connecting steel strip (5) which is arranged along the axial direction of the tunnel and used for connecting a plurality of top cross beams (4); the top cross beams (4) are connected with the steel strip (5) through the top cross beams to form an integral frame structure.
4. The long and large highway tunnel jet fan mounting bracket of claim 3, characterized in that: the fan positioning clamp (6) is integrally omega-shaped; the fan positioning clip (6) is formed by winding a steel belt; the width of the fan positioning clip (6) is the same as that of the top cross beam (4); fan positioning clamp wing lugs (61) are respectively arranged at two end parts of the fan positioning clamp (6) along the length direction of the fan positioning clamp (6); a positioning clamp lug reserved bolt hole (62) is formed in the fan positioning clamp lug (61); a reserved bolt is arranged on the positioning clip lug reserved bolt hole (62); the fan positioning clamp (6) is clamped outside the jet fan (7) and then fixedly connected with the top cross beam (4) through a reserved bolt.
5. The long and large highway tunnel jet fan mounting bracket according to any one of claims 1-4, characterized in that: the first upright post and the second upright post respectively comprise H-shaped steel (1) and a steel backing plate (2) welded on the H-shaped steel (1); the section of the integral structure formed by welding the H-shaped steel (1) and the steel backing plate (2) is rectangular; the H-shaped steel (1) of the first upright column is connected with the H-shaped steel (1) of the second upright column through a top cross beam (4).
6. The long and large highway tunnel jet fan mounting bracket of claim 5, characterized in that: connecting pieces are respectively arranged at two end parts of the top cross beam (4); the steel base plate (2) of the first upright post is connected with the top cross beam (4) through a connecting sheet; and the top cross beam (4) is connected with the steel base plate (2) of the second upright column through a connecting sheet.
7. The long and large highway tunnel jet fan mounting bracket of claim 6, characterized in that: the steel base plate (2) comprises a steel base plate reserved bolt hole (21) and a steel base plate reserved threading hole (22); a reserved bolt is arranged on the reserved bolt hole (21) of the steel base plate; and the steel base plate (2) of the first upright post is fixedly connected with the connecting piece through a reserved bolt.
8. The long and large highway tunnel jet fan mounting bracket of claim 7, characterized in that: the top cross beam (4) is H-shaped steel which is the same as the first upright post or the second upright post; and a top cross beam reserved threading hole (41) is formed in the top cross beam (4).
9. The long and large highway tunnel jet fan mounting bracket of claim 8, characterized in that: the jet fan mounting bracket for the long and large road tunnel further comprises an arc-shaped upright positioning clip (3) which is arranged outside the first upright and the second upright and fixedly connected with the tunnel secondary lining (9); the arc-shaped upright post positioning clip (3) is in a shape like a Chinese character 'ji', and upright post positioning clip wing lugs (31) are arranged at the two end parts of the arc-shaped upright post positioning clip (3) along the length direction of the arc-shaped upright post positioning clip (3); a lug reserved bolt hole (32) is formed in the lug (31) of the column positioning clamp; be provided with expansion bolts on tab reserved bolt hole (32), arc stand column positioning clip (3) card is held and is passed through expansion bolts and tunnel secondary lining (9) fixed connection after first stand and second stand outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922358170.8U CN211500701U (en) | 2019-12-24 | 2019-12-24 | Long and large highway tunnel efflux fan installing support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922358170.8U CN211500701U (en) | 2019-12-24 | 2019-12-24 | Long and large highway tunnel efflux fan installing support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211500701U true CN211500701U (en) | 2020-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922358170.8U Expired - Fee Related CN211500701U (en) | 2019-12-24 | 2019-12-24 | Long and large highway tunnel efflux fan installing support |
Country Status (1)
| Country | Link |
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| CN (1) | CN211500701U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847946A (en) * | 2019-12-24 | 2020-02-28 | 山西省交通科技研发有限公司 | Mounting bracket and mounting method for jet fan of long and large highway tunnel |
| CN112983861A (en) * | 2021-01-25 | 2021-06-18 | 中铁第一勘察设计院集团有限公司 | Jet fan installation and maintenance support under property development vehicle base lid |
| CN113775571A (en) * | 2021-10-22 | 2021-12-10 | 上海市城市建设设计研究总院（集团）有限公司 | Jet fan mounting structure based on tramcar in tunnel |
| CN113958359A (en) * | 2021-10-27 | 2022-01-21 | 中铁宜宾投资建设有限公司 | Novel tunnel air supply duct top baffle |
-
2019
- 2019-12-24 CN CN201922358170.8U patent/CN211500701U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847946A (en) * | 2019-12-24 | 2020-02-28 | 山西省交通科技研发有限公司 | Mounting bracket and mounting method for jet fan of long and large highway tunnel |
| CN112983861A (en) * | 2021-01-25 | 2021-06-18 | 中铁第一勘察设计院集团有限公司 | Jet fan installation and maintenance support under property development vehicle base lid |
| CN112983861B (en) * | 2021-01-25 | 2023-01-31 | 中铁第一勘察设计院集团有限公司 | Jet fan installation and maintenance support under property development vehicle base lid |
| CN113775571A (en) * | 2021-10-22 | 2021-12-10 | 上海市城市建设设计研究总院（集团）有限公司 | Jet fan mounting structure based on tramcar in tunnel |
| CN113958359A (en) * | 2021-10-27 | 2022-01-21 | 中铁宜宾投资建设有限公司 | Novel tunnel air supply duct top baffle |
| CN113958359B (en) * | 2021-10-27 | 2023-12-12 | 中铁宜宾投资建设有限公司 | Tunnel air delivery duct top partition plate and construction method |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20200915 Termination date: 20211224 |