CN205243531U - Crossing construction structures between tunnel transverse passage -way and main cave - Google Patents
Crossing construction structures between tunnel transverse passage -way and main cave Download PDFInfo
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- CN205243531U CN205243531U CN201521027267.6U CN201521027267U CN205243531U CN 205243531 U CN205243531 U CN 205243531U CN 201521027267 U CN201521027267 U CN 201521027267U CN 205243531 U CN205243531 U CN 205243531U
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Abstract
The utility model discloses a crossing construction structures between tunnel transverse passage -way and main cave, include and carry out the fore shaft structure of fore shaft and lay the main cave supporting construction in tunnel main cave the front side entrance to a cave of transverse passage -way that main cave supporting construction is located fore shaft structure front side, the festival section that lies in the front side entrance to a cave front side of transverse passage -way among the tunnel main cave is main cave festival section alternately, and main cave supporting construction lies in alternately festival section of main cave, main cave supporting construction includes a plurality ofly by the preceding second shaped steel bow member of laying after to, multirow by the preceding radial stock of laying after to and multiunit by the preceding lock foot stock of laying after to, the fore shaft structure includes a first shaped steel bow member and supports in the type steel door frame in the first shaped steel bow member outside, first shaped steel bow member is laid on same vertical face with type steel door frame. The utility model has the advantages of simple structure and reasonable design and the construction is simple and convenient, excellent in use effect, can accomplish the work progress of crossing between tunnel transverse passage -way and main cave portably, fast to work progress safe and reliable.
Description
Technical field
The utility model belongs to tunnel construction technology field, especially relates to crossing constructing structure between a kind of tunnel transverse passage-way and main hole.
Background technology
Along with the specially development of technology and the needs of social development of domestic and international high ferro visitor, the constructing tunnel quantity of growing up increases gradually, also more and more higher to the requirement of tunnel construction technology and duration. Grow up in constructing tunnel process, the transverse passage-way of need constructing between the pilot tunnel in parallel of main hole, tunnel, is communicated with main tunnel hole by transverse passage-way with parallel pilot tunnel. When practice of construction, enter tunnel Zhu Dong crossing difficulty of construction larger by transverse passage-way, the construction period is long. Especially the single hole double track tunnel that has transverse passage-way is carried out in work progress, between transverse passage-way and main hole, the difficulty of construction of crossing is larger. And nowadays,, inevitably there is long, the problem such as construction risk is large of construction period in the construction method of the unified and standard of crossing construction neither one between transverse passage-way and main hole, and can be less for the construction information of using for reference when practice of construction. For guaranteeing construction safety, need crossing constructing structure between tunnel transverse passage-way that a kind of simple in structure, reasonable in design and easy construction of design, result of use are good and main hole, can be easy, complete fast the work progress of crossing between tunnel transverse passage-way and main hole, and work progress is safe and reliable, the construction period is easy to ensure.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, crossing constructing structure between a kind of tunnel transverse passage-way and main hole is provided, its simple in structure, reasonable in design and easy construction, result of use are good, can be easy, complete fast the work progress of crossing between tunnel transverse passage-way and main hole, and work progress is safe and reliable, the construction period is easy to ensure.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: crossing constructing structure between a kind of tunnel transverse passage-way and main hole, it is characterized in that: comprise to the hole, front side of transverse passage-way is carried out the locking notch structure of fore shaft and is laid in the main hole supporting construction in main hole, tunnel, described main hole supporting construction is positioned at described locking notch structure front side; Angle between the center line in the main hole of the center line of described transverse passage-way and tunnel be 45 ° and the main hole in its hole, front side and tunnel crossing, the excavation height of described transverse passage-way is lower than the excavation height in main hole, tunnel; The sections that is positioned at the front side, hole, front side of transverse passage-way in main hole, described tunnel is main hole intersection sections, and described main hole supporting construction is positioned at described main hole intersection sections, and described locking notch structure is positioned at supporting construction right side, described main hole;
Described main hole supporting construction comprises multiple radially anchor pole and lock foot anchoring stocks of laying from front to back of organizing that are supported in from front to back the second shaped steel arch in main hole, tunnel, many rows laying from front to back and the arch wall in main hole, tunnel carried out to supporting more, the structure of multiple described the second shaped steel archs and size all with the structure in main hole, tunnel and measure-alike, multiple described the second shaped steel archs are all parallel laying, between the two ends, left and right of each described the second shaped steel arch, all connect by one tunnel bottom reinforcement; Each described the second shaped steel arch all be laid in its outside one row described in radially anchor pole be laid on same vertical plane, described in every row, radially anchor pole includes the many radially anchor poles of laying from front to back along the excavation contour line in main hole, tunnel, and described in many, radially the bottom of anchor pole is all weldingly fixed on the second shaped steel arch; The described lock foot anchoring stock of many groups lays respectively at the bottom, left side of multiple described the second shaped steel archs, described in every group, lock foot anchoring stock includes multiple the first lock foot anchoring stock and multiple the second lock foot anchoring stocks that are positioned at the second shaped steel arch left bottom that are positioned at the second bottom, shaped steel arch left side, the upper end of multiple described the first lock foot anchoring stocks is all fixed on the bottom, left side of the second shaped steel arch, and the upper end of multiple described the second lock foot anchoring stocks is all fixed on the left bottom of the second shaped steel arch;
Described locking notch structure comprises first shaped steel arch and the shaped steel door frame that is supported in the first shaped steel arch outside, and described the first shaped steel arch and shaped steel door frame are laid on same vertical plane; Described the first shaped steel arch is all vertical laying with the second shaped steel arch with shaped steel door frame; Described the first shaped steel arch is supported in the hole, front side of transverse passage-way, the structure of described the first shaped steel arch and size all with the cross-sectional configuration of transverse passage-way and measure-alike; Described the first shaped steel arch comprises the first column that is supported in the arch support of transverse passage-way arch and two and is supported in respectively below, the described arch support left and right sides, and described arch support is shape steel bracket, and described the first column is shaped steel; Described shaped steel door frame comprises that two lay respectively at second column in two described the first column outsides, are supported in two entablature and multiple vertical supporting posts that are connected between entablature and described arch support between described the second column top together, described entablature be positioned at described arch support directly over, described the second column, entablature and vertical supporting post are shaped steel; Each described the second shaped steel arch is all fastenedly connected and is integrated with reinforcing bracing frame;
Described entablature is laid along the longitudinal length direction of described main hole intersection sections, and multiple described the second shaped steel archs are all vertical laying with entablature; The right upper portion of each described the second shaped steel arch is all connected with entablature by together upper horizontal tie-beam.
Crossing constructing structure between above-mentioned a kind of tunnel transverse passage-way and main hole, is characterized in that: the second shaped steel arch that described in every group, lock foot anchoring stock is all connected with it is laid on same vertical plane.
Crossing constructing structure between above-mentioned a kind of tunnel transverse passage-way and main hole, it is characterized in that: described in every group, in lock foot anchoring stock, multiple described the first fixed positions of lock foot anchoring stock upper end on the second shaped steel arch are all identical, described in every group, in lock foot anchoring stock, multiple described the second fixed positions of lock foot anchoring stock upper end on the second shaped steel arch are all identical.
Crossing constructing structure between above-mentioned a kind of tunnel transverse passage-way and main hole, is characterized in that: described shaped steel door frame also comprises and be connected in together two sills between described the second columns bottom, and described sill is level and lays.
Crossing constructing structure between above-mentioned a kind of tunnel transverse passage-way and main hole, is characterized in that: described in per pass, tunnel bottom reinforcement is all connected with sill by one time horizontal tie-beam.
Crossing constructing structure between above-mentioned a kind of tunnel transverse passage-way and main hole, is characterized in that: the quantity of described shaped steel door frame is two, the structure of two described shaped steel door frames and size all identical and the two be side by side and lay, two described shaped steel door frames are fastenedly connected and are integrated.
Crossing constructing structure between above-mentioned a kind of tunnel transverse passage-way and main hole, is characterized in that: identical and its top of the bottom surface height of the overhead height of described arch support and entablature is propped up and withstood on entablature.
The utility model compared with prior art has the following advantages:
1, simple in structure, reasonable in design and drop into construction cost lower.
2, the locking notch structure that adopts is reasonable in design and dismounting is easy, can carry out firm support to the hole, front side of constructed transverse passage-way, and easy being fixed on this reinforcing bracing frame of the shaped steel arch supporting in main hole, tunnel energy, to the supporting construction in the main hole of transverse passage-way and tunnel is fastenedly connected and is integrated, can effectively guarantee the construction safety of transverse passage-way and tunnel Zhu Dong crossing, and this locking notch structure can be easy, complete dismounting fast, can not affect greatly the constructing tunnel duration.
3, the main hole support structure design that adopts is reasonable, easy for installation and result of use is good, can be to effectively supporting in the main hole of crossing, and be fastenedly connected and be integrated with locking notch structure, can effectively guarantee the construction safety of transverse passage-way and tunnel Zhu Dong crossing. Meanwhile, be provided with radially anchor pole and lock foot anchoring stock in main hole supporting construction, can be fastenedly connected and be integrated with all gusset rocks of active.
3, easy construction and result of use are good, can be easy, complete fast the work progress of crossing between tunnel transverse passage-way and main hole, and work progress is safe and reliable, and the construction period is easy to guarantee.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of the utility model main hole supporting construction and locking notch structure.
Fig. 3 is the connection status schematic diagram of the utility model locking notch structure and upper horizontal tie-beam.
Description of reference numerals:
1-transverse passage-way; The 2-the first shaped steel arch; 3-shaped steel door frame;
3-1-the second column; 3-2-entablature; 3-3-vertical supporting post;
3-4-sill; The 4-the second shaped steel arch; Main hole, 5-tunnel;
6-upper horizontal tie-beam; 7-lower horizontal tie-beam; 8-radially anchor pole;
9-tunnel bottom reinforcement; 10-lock foot anchoring stock.
Detailed description of the invention
As shown in Figure 1, Figure 2 and Figure 3, the utility model comprise to the hole, front side of transverse passage-way 1 carry out fore shaft locking notch structure and be laid in the main hole supporting construction in main hole 5, tunnel, described main hole supporting construction is positioned at described locking notch structure front side. Angle between the center line in the main hole 5 in the center line of described transverse passage-way 1 and tunnel be 45 ° and the main hole 5 in its hole, front side and tunnel crossing, the excavation height of described transverse passage-way 1 is lower than the excavation height in main hole 5, tunnel. The sections that is positioned at the front side, hole, front side of transverse passage-way 1 in main hole 5, described tunnel is main hole intersection sections, and described main hole supporting construction is positioned at described main hole intersection sections, and described locking notch structure is positioned at supporting construction right side, described main hole.
Described main hole supporting construction comprises multiple radially anchor pole 8 and lock foot anchoring stocks 10 of laying from front to back of organizing that are supported in from front to back the second shaped steel arch 4 in main hole 5, tunnel, many rows laying from front to back and the arch wall in main hole 5, tunnel carried out to supporting more, the structure of multiple described the second shaped steel archs 4 and size all with the structure in main hole 5, tunnel and measure-alike, multiple described the second shaped steel archs 4 are all parallel laying, between the two ends, left and right of each described the second shaped steel arch 4, all connect by one tunnel bottom reinforcement 9; Each described the second shaped steel arch 4 all be laid in its outside one row described in radially anchor pole 8 be laid on same vertical plane, described in every row, radially anchor pole 8 includes the many radially anchor poles 8 that the excavation contour line in main hole 5 is laid from front to back along tunnel, and described in many, radially the bottom of anchor pole 8 is all weldingly fixed on the second shaped steel arch 4. The described lock foot anchoring stock 10 of many groups lays respectively at the bottom, left side of multiple described the second shaped steel archs 4, described in every group, lock foot anchoring stock 10 includes multiple the first lock foot anchoring stock and multiple the second lock foot anchoring stocks that are positioned at the second shaped steel arch 4 left bottom that are positioned at the second shaped steel arch 4 bottoms, left side, the upper end of multiple described the first lock foot anchoring stocks is all fixed on the bottom, left side of the second shaped steel arch 4, and the upper end of multiple described the second lock foot anchoring stocks is all fixed on the left bottom of the second shaped steel arch 4.
Described locking notch structure comprises first shaped steel arch 2 and the shaped steel door frame 3 that is supported in the first shaped steel arch 2 outsides, and described the first shaped steel arch 2 is laid on same vertical plane with shaped steel door frame 3; Described the first shaped steel arch 2 is all vertical laying with the second shaped steel arch 4 with shaped steel door frame 3; Described the first shaped steel arch 2 is supported in the hole, front side of transverse passage-way 1, the structure of described the first shaped steel arch 2 and size all with the cross-sectional configuration of transverse passage-way 1 and measure-alike. Described the first shaped steel arch 2 comprises the first column that is supported in the arch support of transverse passage-way 1 arch and two and is supported in respectively below, the described arch support left and right sides, and described arch support is shape steel bracket, and described the first column is shaped steel; Described shaped steel door frame 3 comprises that two lay respectively at the second column 3-1 in two described the first column outsides, are supported in two entablature 3-2 and multiple vertical supporting post 3-3 that are connected between entablature 3-2 and described arch support between described the second column 3-1 top together, described entablature 3-2 be positioned at described arch support directly over, described the second column 3-1, entablature 3-2 and vertical supporting post 3-3 are shaped steel; Each described the second shaped steel arch 4 is all fastenedly connected and is integrated with reinforcing bracing frame.
Described entablature 3-2 lays along the longitudinal length direction of described main hole intersection sections, and multiple described the second shaped steel archs 4 are all vertical laying with entablature 3-2; The right upper portion of each described the second shaped steel arch 4 is all connected with entablature 3-2 by together upper horizontal tie-beam 6.
In the present embodiment, the second shaped steel arch 4 that described in every group, lock foot anchoring stock 10 is all connected with it is laid on same vertical plane.
In the present embodiment, described in every group, in lock foot anchoring stock 10, the fixed position of multiple described the first lock foot anchoring stock upper ends on the second shaped steel arch 4 is all identical, and described in every group, in lock foot anchoring stock 10, the fixed position of multiple described the second lock foot anchoring stock upper ends on the second shaped steel arch 4 is all identical.
And, described in every group, in lock foot anchoring stock 10, include two described the first lock foot anchoring stocks and two described the second lock foot anchoring stocks.
When practice of construction, according to specific needs, the quantity of included the first lock foot anchoring stock and the second lock foot anchoring stock in lock foot anchoring stock described in every group 10 is adjusted accordingly.
In the present embodiment, described the second shaped steel arch 4 is formed by multiple arc support section assemblings.
When practice of construction, each described the second shaped steel arch 4 is all fixed on entablature 3-2 by upper horizontal tie-beam 6.
In the present embodiment, described shaped steel door frame 3 also comprises and is connected in together two sill 3-4 between described the second column 3-1 bottom, and described sill 3-4 is level and lays.
And each described the second shaped steel arch 4 is all fixed on sill 3-4 by lower horizontal tie-beam 7.
In the present embodiment, described arch support is assembled by many I-steel, and described the first column is I-steel. Described the second column 3-1, entablature 3-2 and vertical supporting post 3-3 are I-steel.
In the present embodiment, the quantity of described shaped steel door frame 3 is two, the structure of two described shaped steel door frames 3 and size all identical and the two be side by side and lay.
When practice of construction, two described shaped steel door frames 3 are fastenedly connected and are integrated.
In the present embodiment, between two described shaped steel door frames 3, be fastenedly connected by multiple tracks connecting reinforcement.
Reality is propped up immediately shaped steel door frame 3, needs first dig the hole, front side of transverse passage-way 1.
Actually add man-hour, the vertical supporting post 3-3 that is positioned at top, described arch support left side in multiple described vertical supporting post 3-3 is left side support column, and the vertical supporting post 3-3 that is positioned at top, described arch support right side in multiple described vertical supporting post 3-3 is right side support column, the quantity of described left side support column and described right side support column is multiple, and multiple described left side support columns and multiple described right sides support column are symmetrical and lay.
In the present embodiment, described in described shaped steel door frame 3, the quantity of left side support column and described right side support column is three.
When practice of construction, can according to specific needs, the quantity of left side support column and described right side support column described in described shaped steel door frame 3 be adjusted accordingly.
In the present embodiment, identical and its top of the bottom surface height of the overhead height of described arch support and entablature 3-2 is propped up and is withstood on entablature 3-2.
In the present embodiment, described arch support is assembled by multiple arc segment.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every any simple modification of above embodiment being done according to the utility model technical spirit, change and equivalent structure change, and all still belong in the protection domain of technical solutions of the utility model.
Claims (7)
1. crossing constructing structure between a tunnel transverse passage-way and main hole, it is characterized in that: comprise to the hole, front side of transverse passage-way (1) is carried out the locking notch structure of fore shaft and is laid in the main hole supporting construction in main hole, tunnel (5), described main hole supporting construction is positioned at described locking notch structure front side; Angle between the center line in the main hole of the center line of described transverse passage-way (1) and tunnel (5) be 45 ° and the main hole in its hole, front side and tunnel (5) crossing, the excavation height of described transverse passage-way (1) is lower than the excavation height in main hole, tunnel (5); The sections that is positioned at the front side, hole, front side of transverse passage-way (1) in main hole, described tunnel (5) is main hole intersection sections, described main hole supporting construction is positioned at described main hole intersection sections, and described locking notch structure is positioned at supporting construction right side, described main hole;
Described main hole supporting construction comprises multiple the second shaped steel archs (4) that are supported in from front to back in main hole, tunnel (5), many rows lay from front to back and the arch wall in main hole, tunnel (5) are carried out to the radially anchor pole (8) of supporting and the lock foot anchoring stock (10) that many groups are laid from front to back, the structure of multiple described the second shaped steel archs (4) and size all with the structure in main hole, tunnel (5) and measure-alike, multiple described the second shaped steel archs (4) are all parallel laying, between the two ends, left and right of each described the second shaped steel arch (4), all connect by one tunnel bottom reinforcement (9), each described the second shaped steel arch (4) all be laid in its outside one row described in radially anchor pole (8) be laid on same vertical plane, described in every row, radially anchor pole (8) includes the many radially anchor poles (8) that the excavation contour line of main hole (5) is laid from front to back along tunnel, described in many, radially anchor pole (8) is all laid in left side and the top of Second-Type steel arch frame (4), and described in many radially the bottom of anchor pole (8) be all weldingly fixed on the second shaped steel arch (4), the described lock foot anchoring stock of many groups (10) lays respectively at the bottom, left side of multiple described the second shaped steel archs (4), lock foot anchoring stock described in every group (10) includes multiple the first lock foot anchoring stock and multiple the second lock foot anchoring stocks that are positioned at the second shaped steel arch (4) left bottom that are positioned at bottom, the second shaped steel arch (4) left side, the upper end of multiple described the first lock foot anchoring stocks is all fixed on the bottom, left side of the second shaped steel arch (4), and the upper end of multiple described the second lock foot anchoring stocks is all fixed on the left bottom of the second shaped steel arch (4),
Described locking notch structure comprises first shaped steel arch (2) and is supported in the shaped steel door frame (3) in the first shaped steel arch (2) outside, and described the first shaped steel arch (2) is laid on same vertical plane with shaped steel door frame (3); Described the first shaped steel arch (2) is all vertical laying with the second shaped steel arch (4) with shaped steel door frame (3); Described the first shaped steel arch (2) is supported in the hole, front side of transverse passage-way (1), the structure of described the first shaped steel arch (2) and size all with the cross-sectional configuration of transverse passage-way (1) and measure-alike; Described the first shaped steel arch (2) comprises the first column that is supported in the arch support of transverse passage-way (1) arch and two and is supported in respectively below, the described arch support left and right sides, described arch support is shape steel bracket, and described the first column is shaped steel; Described shaped steel door frame (3) comprises that two lay respectively at second column (3-1) in two described the first column outsides, are supported in entablature (3-2) and the multiple vertical supporting post (3-3) being connected between entablature (3-2) and described arch support between two described the second columns (3-1) top together, described entablature (3-2) be positioned at described arch support directly over, described the second column (3-1), entablature (3-2) and vertical supporting post (3-3) are shaped steel; Each described the second shaped steel arch (4) is all fastenedly connected and is integrated with reinforcing bracing frame;
Described entablature (3-2) is laid along the longitudinal length direction of described main hole intersection sections, and multiple described the second shaped steel archs (4) are all vertical laying with entablature (3-2); The right upper portion of each described the second shaped steel arch (4) is all connected with entablature (3-2) by together upper horizontal tie-beam (6).
2. according to crossing constructing structure between a kind of tunnel transverse passage-way claimed in claim 1 and main hole, it is characterized in that: the second shaped steel arch (4) that lock foot anchoring stock described in every group (10) is all connected with it is laid on same vertical plane.
3. according to crossing constructing structure between a kind of tunnel transverse passage-way described in claim 1 or 2 and main hole, it is characterized in that: in lock foot anchoring stock described in every group (10), the fixed position of multiple described the first lock foot anchoring stock upper ends on the second shaped steel arch (4) is all identical, in lock foot anchoring stock described in every group (10), the fixed position of multiple described the second lock foot anchoring stock upper ends on the second shaped steel arch (4) is all identical.
4. according to crossing constructing structure between a kind of tunnel transverse passage-way described in claim 1 or 2 and main hole, it is characterized in that: described shaped steel door frame (3) also comprises the sill (3-4) being connected in together between two described the second columns (3-1) bottom, described sill (3-4) is level and lays.
5. according to crossing constructing structure between a kind of tunnel transverse passage-way claimed in claim 4 and main hole, it is characterized in that: described in per pass, tunnel bottom reinforcement (9) is all connected with sill (3-4) by one time horizontal tie-beam (7).
6. according to crossing constructing structure between a kind of tunnel transverse passage-way described in claim 1 or 2 and main hole, it is characterized in that: the quantity of described shaped steel door frame (3) is two, the structure of two described shaped steel door frames (3) and size all identical and the two be side by side and lay, two described shaped steel door frames (3) are fastenedly connected and are integrated.
7. according to crossing constructing structure between a kind of tunnel transverse passage-way described in claim 1 or 2 and main hole, it is characterized in that: identical and its top of the bottom surface height of the overhead height of described arch support and entablature (3-2) is propped up and withstood on entablature (3-2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521027267.6U CN205243531U (en) | 2015-12-10 | 2015-12-10 | Crossing construction structures between tunnel transverse passage -way and main cave |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521027267.6U CN205243531U (en) | 2015-12-10 | 2015-12-10 | Crossing construction structures between tunnel transverse passage -way and main cave |
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| CN205243531U true CN205243531U (en) | 2016-05-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107130969A (en) * | 2017-07-11 | 2017-09-05 | 北京市政建设集团有限责任公司 | A kind of inclined shaft and main hole intersection substep Enlargement excavation method |
| CN106089215B (en) * | 2016-06-23 | 2018-08-10 | 中铁十二局集团有限公司 | The parallel pilot tunnel of vcehicular tunnel is into transverse passage-way opening construction method |
| CN110671135A (en) * | 2019-10-29 | 2020-01-10 | 中铁（贵州）市政工程有限公司 | Adjustable connecting device for special-shaped steel arch frame |
| CN113944479A (en) * | 2021-10-13 | 2022-01-18 | 中国水利水电第七工程局有限公司 | Unfavorable geological tunnel three-fork construction method |
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2015
- 2015-12-10 CN CN201521027267.6U patent/CN205243531U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089215B (en) * | 2016-06-23 | 2018-08-10 | 中铁十二局集团有限公司 | The parallel pilot tunnel of vcehicular tunnel is into transverse passage-way opening construction method |
| CN107130969A (en) * | 2017-07-11 | 2017-09-05 | 北京市政建设集团有限责任公司 | A kind of inclined shaft and main hole intersection substep Enlargement excavation method |
| CN107130969B (en) * | 2017-07-11 | 2019-06-04 | 北京市政建设集团有限责任公司 | A kind of inclined shaft and main hole intersection substep Enlargement excavation method |
| CN110671135A (en) * | 2019-10-29 | 2020-01-10 | 中铁（贵州）市政工程有限公司 | Adjustable connecting device for special-shaped steel arch frame |
| CN113944479A (en) * | 2021-10-13 | 2022-01-18 | 中国水利水电第七工程局有限公司 | Unfavorable geological tunnel three-fork construction method |
| CN113944479B (en) * | 2021-10-13 | 2023-07-25 | 中国水利水电第七工程局有限公司 | Poor geological tunnel three-fork construction method |
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