CN111119928B - Novel tunnel primary support structure and construction method - Google Patents
Novel tunnel primary support structure and construction method Download PDFInfo
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- CN111119928B CN111119928B CN201911375947.XA CN201911375947A CN111119928B CN 111119928 B CN111119928 B CN 111119928B CN 201911375947 A CN201911375947 A CN 201911375947A CN 111119928 B CN111119928 B CN 111119928B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/155—Laggings made of strips, slats, slabs or sheet piles
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
- E21D11/183—Supporting means for arch members, not provided for in E21D11/22
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D19/00—Provisional protective covers for working space
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
Abstract
The invention relates to a novel tunnel primary support structure, which comprises a support foundation, a connecting section steel column, a steel arch frame, a steel plate, micro-expansion fine aggregate concrete and quick-setting fine aggregate concrete; the supporting foundation is of a cast-in-place reinforced concrete structure, the connecting section steel column is positioned on the supporting foundation, the lateral side, close to the tunnel contour line, of the supporting foundation is provided with a transverse anchoring rib and is anchored in the stratum outside the tunnel, an inverted arch reserved rib is reserved on the outer side surface of the supporting foundation, and the supporting foundation is provided with a groove for placing a water collecting pipe; the steel arch frame is connected with the connecting section steel column through bolts or welding; the steel plates are light and thin straight steel plates or corrugated steel plates, and the steel plates are connected with the steel arch frames and the steel plate units in a welding mode. The invention has the beneficial effects that: compared with the traditional primary supporting structure, the primary supporting structure has the advantages that the structure is relatively simple, the practicability is good, the micro-expansion fine aggregate concrete is adopted to fill the tunnel excavation surface to play a certain back pressure role, and the stability of the tunnel excavation surface can be ensured.
Description
Technical Field
The invention relates to a tunnel primary support structure and a construction method, in particular to a novel tunnel primary support structure and a construction method.
Background
At present, the traditional tunnel primary support structure is a combined stress structure consisting of anchor rods, reinforcing mesh, steel frames and sprayed concrete, although the primary support structure is applied greatly, certain problems also exist, such as huge dust pollution inside the tunnel caused by anchor rod drilling and sprayed concrete seriously damages the cardio-pulmonary function of workers, overlarge deformation caused by release of initial stress around the tunnel, disorderly drainage and irregularity inside the tunnel and the like inside the tunnel, and the technical development and progress of the tunnel primary support structure in China are also restricted to a certain extent by the problems, so that the traditional primary support structure needs to be innovated and reformed to adapt to the construction requirement of modernization of society in a new period.
Therefore, it is important to find a novel tunnel primary supporting structure and a construction method which can ensure the stability of the tunnel excavation surface, improve the tunnel construction environment, ensure the regular drainage in the tunnel and prevent the infiltration damage.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a novel tunnel primary support structure and a construction method.
The novel tunnel primary supporting structure comprises a supporting foundation, a connecting section steel column, a steel arch frame, a steel plate, micro-expansion fine aggregate concrete and quick-setting fine aggregate concrete; the supporting foundation is of a cast-in-place reinforced concrete structure, the connecting section steel column is positioned on the supporting foundation, the lateral side, close to the tunnel contour line, of the supporting foundation is provided with a transverse anchoring rib and is anchored in the stratum outside the tunnel, an inverted arch reserved rib is reserved on the outer side surface of the supporting foundation, and the supporting foundation is provided with a groove for placing a water collecting pipe; the steel arch frame is connected with the connecting section steel column through bolts or welding; the steel plate is a light and thin straight-face steel plate or a corrugated steel plate, the steel plate and the steel arch frame and the steel plate units are connected in a welding mode, the lap joint of the steel plate and the bottom of the steel plate and the supporting foundation are sealed, a waterproof semi-circular arc structure is formed among the steel plate, the steel arch frame and the supporting foundation, a grouting opening and a hook are arranged on the steel plate, and the length of the hook is greater than the section height of the steel arch frame; the micro-expansion fine stone concrete is filled in a space formed by the outer side of the steel plate and the contour line of the tunnel; the quick-setting fine aggregate concrete is sprayed on the outer side of the steel arch frame, and the spraying thickness of the quick-setting fine aggregate concrete is larger than the length of the hook on the steel plate; and reserving core soil in the middle of the tunnel.
Preferably, the method comprises the following steps: a bullet-shaped pilot tunnel is excavated at the intersection position of the tunnel contour line and the pilot tunnel contour line, a supporting foundation is positioned in the bullet-shaped pilot tunnel, a protection system is arranged for excavating the bullet-shaped pilot tunnel, the protection system is composed of umbrella-shaped support frames, connecting rods and a protective net, and the umbrella-shaped support frames are connected with the protective net through the connecting rods; the umbrella-shaped support frame is formed by connecting a main rod, a secondary rod and a stop rod.
Preferably, the method comprises the following steps: the bottom of the supporting foundation is provided with a small grouting conduit and a vertical anchoring rib, and the foundation of the supporting foundation is reinforced by joint treatment of cement paste injected into the stratum by the small grouting conduit and the vertical anchoring rib.
The construction method of the novel tunnel primary support structure comprises the following steps:
1) performing bilateral symmetrical excavation work of the bullet-shaped pilot tunnel at the intersection position of the tunnel contour line and the pilot tunnel contour line, and arranging an umbrella-shaped support frame when excavation reaches a certain depth, wherein the umbrella-shaped support frame is made of a main rod, a secondary rod and a stop rod, the umbrella-shaped support frames are connected with each other by a connecting rod and a protective net, and the bottom end of the main rod of the umbrella-shaped support frame is embedded into the stratum to form a protective system of the bullet-shaped pilot tunnel;
2) after the bullet-shaped pilot tunnel is excavated to a certain depth, performing foundation treatment work on a supporting foundation, performing grouting small guide pipe grouting on the bottom of the supporting foundation to reinforce the foundation, then arranging transverse anchoring ribs on the adjacent side of the supporting foundation close to the tunnel contour line, and arranging vertical anchoring ribs on the reinforced foundation of the supporting foundation to complete the foundation treatment work of the supporting foundation;
3) arranging a template, erecting reinforcing steel bars and pouring concrete at a preset position of a supporting foundation to carry out construction operation of the supporting foundation, embedding a connecting section steel column in the supporting foundation in the cast-in-place operation work of the supporting foundation, and reserving a groove and an inverted arch reserved rib on the supporting foundation;
4) dismantling a protection system of the bullet-shaped pilot tunnel, performing operation construction of an excavation area, reserving core soil in the middle of the tunnel, and using the core soil as an operation platform for constructing a primary supporting structure;
5) after the excavation of the excavated area is finished, the installation construction work of the steel arch is carried out by using relevant mechanical equipment and core soil as an operation platform, and two end parts of the steel arch are tightly and firmly connected with the connecting section steel column on the supporting foundation;
6) after the steel arch frame is installed, assembling a water collecting pipe at the groove on the outer side of the supporting foundation;
7) after the assembly of the water collecting pipe is finished, spot welding is carried out on the steel plates at the back of the steel arch frame, the steel plates are also connected by spot welding, and the lap joint is filled with sealant; in addition, the inner side of the steel plate is provided with a hook, and the lower part, the middle part and the top of the steel plate are provided with grouting ports for pouring micro-expansion fine stone concrete;
8) sequentially pouring micro-expansion fine stone concrete from bottom to top by using a grouting opening in the steel plate, and after the pouring is finished, sequentially plugging and sealing the grouting opening;
9) spraying quick-setting fine aggregate concrete on the inner side of the steel arch frame by taking core soil as an operation platform, wherein the spraying thickness of the quick-setting fine aggregate concrete submerges the length of the hook on the steel plate;
10) and repeating the steps 1) to 9) to form a novel tunnel primary support structure of the whole tunnel.
The invention has the beneficial effects that:
(1) compared with the traditional primary supporting structure, the primary supporting structure has the advantages that the structure is relatively simple, the practicability is good, the micro-expansion fine aggregate concrete is adopted to fill the tunnel excavation surface to play a certain back pressure role, and the stability of the tunnel excavation surface can be ensured.
(2) Compared with the traditional primary supporting structure, the invention forms a waterproof semi-arc structure by utilizing the steel plates, the steel arch frames and the supporting foundation, so that water generated in tunnel construction flows out along the water collecting pipe outside the supporting foundation, and the damage phenomena such as flowing water damage and the like are prevented.
(3) Compared with the traditional primary supporting structure, the steel arch frame is connected by the steel plates, the formed integral rigidity is higher, and the steel arch frame also has the functions of preventing water, water and dust, preventing hard objects from falling and the like, improves the construction operation environment and is convenient for workers to construct in the tunnel.
(4) Compared with the traditional primary supporting structure, the steel plate is provided with the hooks, so that the micro-expansion fine aggregate concrete, the steel plate, the steel arch frame and the quick-setting fine aggregate concrete on the outer side can form a firm connecting body, and the firmness of the supporting structure is greater than that of the traditional supporting structure.
(5) Compared with the traditional primary supporting structure, the spraying and mixing structure is divided into two parts, wherein one part is formed by pouring micro-expansion fine stone concrete in an internal closed space, so that dust pollution in a tunnel is avoided, and the phenomenon of wasting the concrete is avoided; the other part is that the outside sprays the fine aggregate concrete that sets fast, and the couple through setting up can reduce the waste that drops that spouts thoughtlessly.
(6) Compared with the traditional primary supporting structure, the construction operation of the bullet-shaped pilot tunnel auxiliary supporting foundation is added, and the supporting strength of the supporting foundation is enhanced to a certain extent by the arrangement of the supporting foundation.
Drawings
FIG. 1 is a schematic view of the excavation protection of a bullet-shaped pilot tunnel;
FIG. 2 is a schematic view of the treatment of the foundation of the support;
FIG. 3 is a schematic view of the completion of the construction work of the supporting foundation;
FIG. 4 is a schematic diagram of the excavated area;
FIG. 5 is a schematic view of the steel arch setup;
FIG. 6 is a schematic view of the manifold;
FIG. 7 is a schematic view of the installation of steel plates on the back of the steel arch;
FIG. 8 is a schematic view of the placement of micro-expansive fine-stone concrete on the back of a steel plate;
FIG. 9 is a schematic view of spraying quick-setting fine-stone concrete on the inner side of a steel arch;
FIG. 10 is a schematic view of the protection system of the bullet-shaped pilot hole;
FIG. 11 is a schematic longitudinal section of a support foundation;
fig. 12 is a schematic cross-sectional view of a steel plate.
Description of reference numerals: 1-supporting a foundation; 2-steel arch centering; 3-a steel plate; 4-micro-expansion fine stone concrete; 5-quick-setting fine aggregate concrete; 6-a water collecting pipe; 7-transverse anchoring ribs; 8-vertical anchoring ribs; 9-grouting small conduit; 10-reserving ribs on an inverted arch; 11-hanging hooks; 12-connecting section steel columns; 13-core soil; 14-cement slurry; 15-grouting port; 16-a groove; 17-umbrella-shaped support; 18-bullet nose pilot hole; 19-tunnel contour line; 20-guiding hole contour line; 21-main pole; 22 rods; 23-gear lever; 24-a connecting rod; 25-protective screening; 26-excavation area.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
According to the figure 1, the bullet-shaped pilot tunnel 18 is symmetrically excavated at the intersection of the tunnel contour line 19 and the pilot tunnel contour line 20, each time an umbrella-shaped support 17 is arranged at a certain depth, the umbrella-shaped support 17 is made of a main rod 21, a sub-rod 22 and a stop rod 23, the umbrella-shaped supports 17 are connected with each other by a connecting rod 24 and a protective net 25, and the bottom end of the main rod 21 of the umbrella-shaped support 17 is embedded into the ground layer to form a protective system for the bullet-shaped pilot tunnel 18, as shown in figure 10.
According to the figure 2, after the bullet-shaped pilot tunnel 18 is excavated to a certain depth, the foundation treatment work of the supporting foundation 1 is carried out, the grouting small guide pipe 9 is carried out at the bottom of the supporting foundation 1 to perform grouting reinforcement on the foundation, then the transverse anchoring rib 7 is arranged at the adjacent side of the supporting foundation 1 close to the tunnel contour line 19, the vertical anchoring rib 8 is arranged on the reinforcement foundation of the supporting foundation 1, and the foundation treatment work of the supporting foundation 1 is completed, as shown in the figure 11.
According to the figure 3, a template, a steel bar and concrete are arranged at a preset position of the supporting foundation 1 to carry out construction operation of the supporting foundation 1, and in the cast-in-place operation work of the supporting foundation 1, the connecting section steel column 12 is embedded in the supporting foundation 1, and a groove 16 and an inverted arch reserved rib 10 are reserved.
According to the figure 4, the protection system of the bullet-shaped pilot tunnel 18 is removed, the operation construction of the excavation area 26 is carried out, and the core soil 13 is reserved in the middle of the tunnel and can be used as an operation platform for the construction of the primary support structure.
According to the illustration in fig. 5, after the excavated area 26 is removed, the installation and construction work of the steel arch 2 is performed by using the relevant mechanical equipment and the core soil 13 as an operation platform, and the two ends of the steel arch 2 are tightly and firmly connected with the connecting section steel columns 12 on the supporting foundation 1.
According to the figure 6, after the steel arch 2 is installed, the water collecting pipe 6 is assembled at the groove 16 on the outer side of the supporting foundation 1.
According to the illustration in fig. 7, after the water collecting pipe 6 is assembled, the steel plate 3 is spot-welded and connected to the back of the steel arch frame 2, the steel plate 3 and the steel plate 3 are also spot-welded and connected, and the lap joint is filled with sealant to prevent water leakage; further, a hook 11 is provided on the inner side of the steel plate 3, and grouting ports 15 are provided on the lower, middle and top portions of the steel plate 3, as shown in fig. 12, for pouring the micro-expansive fine stone concrete 4.
According to the figure 8, the micro-expansion fine-stone concrete 14 is poured from bottom to top in sequence by using the grouting opening 15 on the steel plate 3, and after the pouring is finished, the grouting opening 15 is sequentially sealed.
According to fig. 9, on the inner side of the steel arch 3, the quick setting fine stone concrete 5 is sprayed by using the core soil 13 as an operation platform, and the spraying thickness of the quick setting fine stone concrete 5 is to submerge the length of the hook 11 on the steel plate 3.
And repeating the steps to form the novel tunnel primary support structure of the whole tunnel.
Claims (2)
1. Novel tunnel preliminary bracing structure, its characterized in that: the concrete-reinforced concrete composite support comprises a support foundation (1), a connecting section steel column (12), a steel arch frame (2), a steel plate (3), micro-expansion fine aggregate concrete (4) and quick-setting fine aggregate concrete (5); the supporting foundation (1) is of a cast-in-place reinforced concrete structure, the connecting section steel column (12) is located on the supporting foundation (1), the lateral anchoring rib (7) is arranged on the adjacent side, close to the tunnel contour line (19), of the supporting foundation (1) and anchored in the stratum outside the tunnel, the inverted arch reserved rib (10) is reserved on the outer side surface of the supporting foundation (1), and the supporting foundation (1) is provided with a groove (16) for placing the water collecting pipe (6); the steel arch frame (2) is connected with the connecting section steel column (12) through bolts or welding; the steel plate (3) is a light and thin straight-face steel plate or a corrugated steel plate, the steel plate (3) is connected with the steel arch frame (2) and the steel plate (3) units in a welding mode, the lap joint of the steel plate (3) and the bottom of the steel plate (3) are sealed with the supporting foundation (1), a waterproof semi-circular arc structure is formed among the steel plate (3), the steel arch frame (2) and the supporting foundation (1), a grouting opening (15) and a hook (11) are arranged on the steel plate (3), and the length of the hook (11) is greater than the section height of the steel arch frame (2); the micro-expansion fine stone concrete (4) is filled in a space formed by the outer side of the steel plate (3) and a tunnel contour line (19); the quick-setting fine aggregate concrete (5) is sprayed on the outer side of the steel arch frame (2), and the spraying thickness of the quick-setting fine aggregate concrete (5) is larger than the length of a hook (11) on the steel plate (3); reserving core soil (13) in the middle of the tunnel; a bullet-shaped pilot tunnel (18) is excavated at the intersection position of a tunnel contour line (19) and a pilot tunnel contour line (20), a supporting foundation (1) is positioned in the bullet-shaped pilot tunnel (18), a protection system is arranged for excavating the bullet-shaped pilot tunnel (18), the protection system is composed of umbrella-shaped supporting frames (17), connecting rods (24) and a protective net (25), and the umbrella-shaped supporting frames (17) are connected with the protective net (25) through the connecting rods (24); the umbrella-shaped support frame (17) is formed by connecting a main rod (21), a secondary rod (22) and a stop rod (23); the bottom of the supporting foundation (1) is provided with a small grouting pipe (9) and a vertical anchoring rib (8), and the foundation of the supporting foundation (1) is reinforced by joint treatment of cement paste (14) injected into the stratum by the small grouting pipe (9) and the vertical anchoring rib (8).
2. A construction method of a novel tunnel preliminary bracing structure according to claim 1, characterized by comprising the steps of:
1) the method comprises the following steps that bilaterally symmetrical excavation work of a bullet-shaped pilot tunnel (18) is conducted at the intersection position of a tunnel contour line (19) and a pilot tunnel contour line (20), an umbrella-shaped support frame (17) is arranged when excavation is conducted to a certain depth, the umbrella-shaped support frame (17) is made of a main rod (21), a sub rod (22) and a stop rod (23), the umbrella-shaped support frames (17) are connected with a protective net (25) through connecting rods (24), and the bottom end of the main rod (21) of the umbrella-shaped support frame (17) is embedded into a stratum to form a protective system of the bullet-shaped pilot tunnel (18);
2) after the bullet-shaped pilot tunnel (18) is excavated to a certain depth, performing foundation treatment work on the supporting foundation (1), performing grouting on a small grouting pipe (9) at the bottom of the supporting foundation (1) to reinforce the foundation, then arranging a transverse anchoring rib (7) at the adjacent side of the supporting foundation (1) close to a tunnel contour line (19), and arranging a vertical anchoring rib (8) on the reinforced foundation of the supporting foundation (1) to complete the foundation treatment work of the supporting foundation (1);
3) arranging a template, erecting reinforcing steel bars and pouring concrete at a preset position of a supporting foundation (1) to carry out construction operation of the supporting foundation (1), embedding a connecting section steel column (12) in the supporting foundation (1) in the cast-in-place operation work of the supporting foundation (1), and reserving a groove (16) and an inverted arch reserved rib (10) on the supporting foundation (1);
4) dismantling a protection system of the bullet-shaped pilot tunnel (18), performing operation construction of an excavation area (26), reserving core soil (13) in the middle of the tunnel, and using the core soil as an operation platform for constructing a primary support structure;
5) after the excavation of the excavated area (26) is finished, the installation construction work of the steel arch (2) is carried out by using relevant mechanical equipment and core soil (13) as an operation platform, and two end parts of the steel arch (2) are tightly and firmly connected with connecting section steel columns (12) on the supporting foundation (1);
6) after the steel arch (2) is installed, assembling a water collecting pipe (6) at a groove (16) on the outer side of the supporting foundation (1);
7) after the water collecting pipe (6) is assembled, spot welding is carried out on the steel plate (3) at the back of the steel arch frame (2), the steel plate (3) and the steel plate (3) are connected by spot welding, and the lap joint is filled with sealant; in addition, a hook (11) is arranged on the inner side of the steel plate (3), and grouting ports (15) are arranged at the lower part, the middle part and the top of the steel plate (3) and used for pouring micro-expansion fine stone concrete (4);
8) sequentially pouring micro-expansion fine stone concrete (4) from bottom to top by using a grouting opening (15) in the steel plate (3), and after pouring is finished, sequentially plugging and sealing the grouting opening (15);
9) spraying quick-setting fine aggregate concrete (5) on the inner side of the steel arch frame (2) by using core soil (13) as an operation platform, wherein the spraying thickness of the quick-setting fine aggregate concrete (5) submerges the length of a hook (11) on the steel plate (3);
10) and repeating the steps 1) to 9) to form a novel tunnel primary support structure of the whole tunnel.
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| CN111706361A (en) * | 2020-06-04 | 2020-09-25 | 中铁大桥勘测设计院集团有限公司 | Steel frame back filling equipment in tunnel and construction method thereof |
| CN113914891B (en) * | 2021-09-15 | 2022-08-05 | 华亭煤业集团有限责任公司 | Pre-empty soft rock roadway supporting structure and construction method thereof |
| CN113914901B (en) * | 2021-11-11 | 2024-04-09 | 中国铁建大桥工程局集团有限公司 | Tunnel supporting structure |
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| CN108547645A (en) * | 2018-06-19 | 2018-09-18 | 北京中地盾构工程技术研究院有限公司 | It is a kind of to realize prestressed assembled tunnel support device and method |
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