CN209942821U - Shallow supporting construction that unites in bias voltage section space that buries in entrance to a cave - Google Patents
Shallow supporting construction that unites in bias voltage section space that buries in entrance to a cave Download PDFInfo
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- CN209942821U CN209942821U CN201920729232.9U CN201920729232U CN209942821U CN 209942821 U CN209942821 U CN 209942821U CN 201920729232 U CN201920729232 U CN 201920729232U CN 209942821 U CN209942821 U CN 209942821U
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Abstract
The utility model discloses a shallow supporting construction that unites in bias voltage section space of burying of entrance to a cave relates to tunnel construction technical field, has solved and has adopted conventional spray anchor earlier in the construction of shallow bias voltage tunnel entrance to a cave to strut and when executing the hidden tunnel again side slope poor stability under the massif, easily makes massif side slope unstability, endangers the problem of tunnel structure safety. The key points of the technical scheme are as follows: comprises an inner side slide-resistant pile, an outer side slide-resistant pile and a tunnel; the inner side anti-slide pile is connected with a locking port reinforcing beam; steel sheet piles are arranged between the outer anti-slide piles; a guide pipe is reserved on the outer side slide-resistant pile; a small catheter extending into the mountain body is arranged in the guide tube in a penetrating way; the small guide pipe is connected with grouting body. The rock-soil mass of the mountain can be effectively reinforced, the stability of the mountain is enhanced, the damage of tunnel construction to the mountain is reduced, and the natural ecological environment is protected; meanwhile, the surrounding rock pressure and the side pressure of the tunnel can be reduced, the vault of the tunnel is prevented from sinking, and the tunnel portal section construction method is suitable for safe and reliable tunnel portal section construction under different geological and topographic conditions.
Description
Technical Field
The utility model relates to a tunnel construction technical field, more specifically say, it relates to a shallow supporting construction that buries bias voltage section space in entrance to a cave.
Background
A key link in tunnel engineering is tunnel portal section construction, particularly the problems that the geological topography of a shallow buried bias section of a tunnel portal is complex, large deformation or collapse and the like easily occur in the construction process. Therefore, the tunnel portal section is the key to tunnel construction, and each construction detail should be well controlled. When the construction entrance to a cave is shallowly buried the bias voltage section, need avoid because of the unstable or collapse of rock mass one side that the bias voltage caused, still need avoid the concrete that the bias voltage brought to drop and the crack, prevent that the bow member from taking place distortion, structure emergence fracture and displacement dislocation. If the selected construction scheme is improper, the method and the process are not reasonable, the stability of the tunnel is affected, and even the tunnel cannot be drilled. Therefore, when the shallow buried bias section construction is performed on the tunnel opening, effective construction technology needs to be studied to strictly control the mountain slope and the tunnel deformation.
At present, aiming at the problem of shallow buried bias voltage existing in most of holes, a large amount of excavation is usually carried out to construct open cut tunnels; or adopting conventional spray anchor support and then making a dark hole.
In the prior art, if a large amount of excavation is carried out to construct open cut tunnels, the engineering quantity is large, high slopes are formed, the environment is seriously damaged, and the operation safety is also unfavorable. If the conventional spray anchor support is adopted to construct a hidden hole, the slope stability is poor in the support mode, excavation disturbance can cause instability of the slope, and the safety of the tunnel structure is further endangered.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a shallow supporting construction that unites in bias voltage section space that buries of entrance to a cave has the ground body to the massif and effectively consolidates to strengthen the stability of massif, can reduce the tunnel construction and to the destruction of massif, protect natural ecological environment, can effectively reduce the country rock pressure and the side pressure in tunnel simultaneously, and prevent that the tunnel vault from sinking, can adapt to the effect of carrying out safe and reliable's tunnel construction under different geology topography condition.
The above technical purpose of the present invention can be achieved by the following technical solutions: a spatial combined supporting structure of a shallow-buried bias section of a hole comprises a plurality of inner side anti-slide piles, a plurality of outer side anti-slide piles and a tunnel, wherein the inner side anti-slide piles are arranged on the inner side of a mountain body at intervals in the vertical direction, the outer side anti-slide piles are arranged on the outer side of the mountain body at intervals in the vertical direction, and the tunnel is arranged between the inner side anti-slide piles and the outer side anti-slide piles; the top ends of the inner anti-slide piles are connected with a locking port reinforcing beam; steel sheet piles are arranged between the outer anti-slide piles; the top end of the outer side slide-resistant pile is provided with a guide pipe, the guide pipe is arranged in the horizontal direction, and the end part of the guide pipe is close to the side wall of the inner side slide-resistant pile; a small guide pipe penetrates through the guide pipe, and the end part of the small guide pipe penetrates through the side wall of the anti-slide pile at the inner side and extends into the mountain body; the end part of the small guide pipe, which is positioned in the mountain body, is connected with a grouting body formed through grouting, and the grouting body is close to the side wall of the inner side slide-resistant pile.
By adopting the technical scheme, in the process of tunnel construction, the counterforce is conveniently applied to the inner side of the mountain body by applying the plurality of inner side anti-sliding piles in the vertical direction to the inner side of the mountain body, so that the side pressure of surrounding rocks on the inner side of the mountain body in the process of tunnel excavation is reduced, and the vault sinking of the tunnel in the process of tunnel construction is conveniently and effectively prevented; through the outer side anti-slide piles, counterforce is applied to the outer side of the mountain conveniently, so that the pressure of surrounding rocks on the outer side of the mountain in the tunnel construction process is reduced conveniently, and the stability of a slope on the outer side of the mountain is improved conveniently; pile tops of a plurality of inner side anti-slide piles positioned on the inner side of the mountain body are conveniently connected into a whole through the locking port reinforcing beam; meanwhile, the pile top of the inner side slide-resistant pile is conveniently capped and reinforced through the locking port reinforcing beam; the small guide pipe passes through the side wall of the inner slide-resistant pile and extends into the mountain body for guiding through the guide pipe; through the small guide pipe, grouting work is conveniently carried out to form grouting bodies which are positioned in the mountain body and close to the side wall of the inner side slide-resistant pile, so that rock and soil mass in the mountain body can be conveniently reinforced, and a space combined supporting structure is formed among the inner side slide-resistant pile, the outer side slide-resistant pile and the small guide pipe; through the combined supporting structure formed by the inner side anti-slide piles, the outer side anti-slide piles, the locking port reinforcing beam, the guide pipe, the small guide pipe and the grouting body, the rock and soil mass of the mountain can be effectively reinforced, the stability of the mountain is enhanced, the damage of tunnel construction to the mountain is reduced, the natural ecological environment is protected, the surrounding rock pressure and the side pressure of the tunnel can be effectively reduced, the vault of the tunnel is prevented from sinking, and the tunnel construction device can be suitable for safe and reliable tunnel construction under different geological and topographic conditions.
The utility model discloses further set up to: and the steel sheet pile is fixedly connected with the outer side slide-resistant pile.
Through adopting above-mentioned technical scheme, through the fixed connection between steel sheet pile and the outside friction pile, be convenient for link into an organic whole with a plurality of outside friction piles in the massif outside to be convenient for the joint between outside friction pile and the steel sheet pile is strutted.
The utility model discloses further set up to: the cross section of the outer side anti-slide pile is isosceles trapezoid, and the distance between the outer side anti-slide pile and the outer side anti-slide pile is 50-80 cm.
By adopting the technical scheme, the outer side slide-resistant piles with isosceles trapezoid cross sections and the distance between the outer side slide-resistant piles and the outer side slide-resistant piles are 50-80cm, so that the inter-pile soil arch effect is formed between the outer side slide-resistant piles and the outer side slide-resistant piles conveniently.
The utility model discloses further set up to: the section of the inner side slide-resistant pile is rectangular, and the distance between the inner side slide-resistant pile and the inner side slide-resistant pile is 50-80 cm; the height of the pile top of the inner side slide-resistant pile from the ground surface is 30cm, and a reinforcing steel bar with the length of 30cm is reserved at the pile top of the inner side slide-resistant pile.
By adopting the technical scheme, the distance between the inner side slide-resistant pile with the rectangular cross section and the inner side slide-resistant pile is 50-80cm, so that the inter-pile soil arch effect can be conveniently exerted between the inner side slide-resistant pile and the inner side slide-resistant pile; the length of the steel bar reserved on the pile top of the inner side anti-slide pile is 30cm, so that concrete can be poured conveniently to form the locking port reinforcing beam.
The utility model discloses further set up to: the fore shaft reinforcing beam is a reinforced concrete structure formed by integrally pouring reinforcing steel bars in the height of the reinforcing steel bars with the length of 30cm reserved at the pile top of the anti-slide pile at the inner side.
By adopting the technical scheme, the plurality of inner side anti-slide piles are conveniently connected into a whole through the locking port reinforcing beam; simultaneously, carry out the reinforced concrete structure that concrete placement formed through the high range of the reinforcing bar of reserving at inboard friction pile top, be convenient for carry out the capping reinforcement to the pile bolck of inboard friction pile.
The utility model discloses further set up to: the pile body of the inner side slide-resistant pile is provided with a small hole for a small guide pipe to pass through, the small hole is close to the top end of the inner side slide-resistant pile, and the diameter of the small hole is 45-50 mm.
By adopting the technical scheme, the end part of the small guide pipe can conveniently penetrate through the side wall of the inner anti-slide pile and extend into the mountain body through the small hole.
The utility model discloses further set up to: a water intercepting gutter close to the top end of the anti-slide pile on the inner side is arranged in the direction perpendicular to the cross slope of the mountain body, and the size of the water intercepting gutter is 40cm multiplied by 30 cm; and a drainage pipe with the end part close to the intercepting gutter is arranged on the inner downslope of the mountain slope body.
By adopting the technical scheme, the surface water and the underground water can be conveniently and fully removed through the water intercepting gutter, so that the underground water flow can be prevented from permeating into the tunnel.
To sum up, the utility model discloses following beneficial effect has: through a plurality of inner side anti-slide piles which are applied to the inner side of the mountain body in the vertical direction, counterforce is conveniently applied to the inner side of the mountain body, so that the side pressure of surrounding rocks on the inner side of the mountain body in the tunnel excavation process is reduced, and the vault sinking of the tunnel in the tunnel construction process is conveniently and effectively prevented; through the outer side anti-slide piles, counterforce is applied to the outer side of the mountain conveniently, so that the pressure of surrounding rocks on the outer side of the mountain in the tunnel construction process is reduced conveniently, and the stability of a slope on the outer side of the mountain is improved conveniently; pile tops of a plurality of inner side anti-slide piles positioned on the inner side of the mountain body are conveniently connected into a whole through the locking port reinforcing beam; meanwhile, the pile top of the inner side slide-resistant pile is conveniently capped and reinforced through the locking port reinforcing beam; the small guide pipe passes through the side wall of the inner slide-resistant pile and extends into the mountain body for guiding through the guide pipe; through the small guide pipe, grouting work is conveniently carried out to form grouting bodies which are positioned in the mountain body and close to the side wall of the inner side slide-resistant pile, so that rock and soil mass in the mountain body can be conveniently reinforced, and a space combined supporting structure is formed among the inner side slide-resistant pile, the outer side slide-resistant pile and the small guide pipe; through the combined supporting structure formed by the inner side anti-slide piles, the outer side anti-slide piles, the locking port reinforcing beam, the guide pipe, the small guide pipe and the grouting body, the rock and soil mass of the mountain can be effectively reinforced, the stability of the mountain is enhanced, the damage of tunnel construction to the mountain is reduced, the natural ecological environment is protected, the surrounding rock pressure and the side pressure of the tunnel can be effectively reduced, the vault of the tunnel is prevented from sinking, and the tunnel construction device can be suitable for safe and reliable tunnel construction under different geological and topographic conditions.
Drawings
Fig. 1 is a schematic structural diagram in an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a mountain in an embodiment of the present invention;
FIG. 3 is a schematic view of a connection structure of an outer slide-resistant pile and a steel sheet pile in an embodiment of the present invention;
fig. 4 is a schematic view of a connection structure of the inner slide-resistant piles and the fore shaft reinforcing beams in the embodiment of the present invention;
fig. 5 is a schematic structural view of the catch gutter and the drain pipe in the embodiment of the present invention.
In the figure: 1. a mountain body; 2. an inner slide-resistant pile; 3. an outboard friction pile; 4. a tunnel; 5. a fore shaft reinforcing beam; 6. a guide tube; 7. a small catheter; 8. grouting; 9. steel sheet piles; 10. reinforcing steel bars; 11. a small hole; 12. intercepting a gutter; 13. and a water discharge pipe.
Detailed Description
The present invention will be described in further detail with reference to fig. 1 to 5.
Example (b): a combined supporting structure for a cavity shallow-buried bias section space is shown in figures 1, 2, 3, 4 and 5 and comprises a plurality of inner anti-slide piles 2 driven into rock and soil mass on the inner side of a mountain body 1 at intervals in the vertical direction, a plurality of outer anti-slide piles 3 driven into rock and soil mass on the outer side of the mountain body 1 at intervals in the vertical direction and a tunnel 4 positioned between the inner anti-slide piles 2 and the outer anti-slide piles 3. The top end of the inner side anti-slide pile 2 is provided with a locking reinforcing beam 5. Steel sheet piles are arranged between the outer side anti-slide piles. The top end of the outer slide-resistant pile 3 is provided with a guide pipe 6 in the horizontal direction, and the end part of the guide pipe 6 is close to the side wall of the inner slide-resistant pile 2. A small guide pipe 7 for grouting is inserted into the guide pipe 6, and the end part of the small guide pipe 7 penetrates through the side wall of the inner slide-resistant pile 2 and extends into the mountain body 1. The end part of the small guide pipe 7 positioned in the mountain body 1 is connected with a grouting body 8 formed by grouting, and the grouting body 8 is close to the side wall of the inner slide-resistant pile 2.
In this embodiment, before tunnel 4 construction, through a plurality of inboard friction piles 2 of doing to 1 inboard vertical direction of massif, be convenient for exert the counter-force to 1 inboard of massif to reduce the lateral pressure of 1 inboard country rock of massif in the tunnel 4 excavation process, thereby be convenient for effectively prevent that tunnel 4's vault sinks in the tunnel 4 work progress. Through outside friction pile 3, be convenient for exert the counter-force to the massif 1 outside to be convenient for reduce the pressure of inclining to one side of massif 1 outside country rock in the 4 work progress in tunnel, thereby be convenient for increase the stability of massif 1 outside slope. The pile tops of a plurality of inner side slide-resistant piles 2 positioned at the inner side of the mountain body 1 are conveniently connected into a whole through the locking port reinforcing beam 5. Meanwhile, the pile top of the inner side slide-resistant pile 2 is conveniently capped and reinforced through the locking port reinforcing beam 5. The guide pipe 6 is convenient for guiding the small guide pipe 7 to extend into the mountain body 1 through the side wall of the inner side slide-resistant pile 2. Through little pipe 7, be convenient for carry out slip casting work and form the slip casting body 8 that is located mountain 1 and is close to inboard friction pile 2 lateral wall to be convenient for consolidate the ground body in the mountain 1, thereby make and form space joint supporting construction between inboard friction pile 2, outside friction pile 3 and the little pipe 7. Through the joint supporting structure that inboard friction pile 2, outside friction pile 3, fore shaft reinforcing beam 5, stand pipe 6, ductule 7 and slip casting body 8 constitute, can reduce the destruction to massif 1 in the 4 work progress in the tunnel, protect natural ecological environment, and effectively consolidate the ground body of massif 1, thereby strengthen the stability of massif 1, can effectively reduce the country rock pressure in tunnel 4 simultaneously, incline pressure and prevent that tunnel 4 vault from sinking, thereby can adapt to and carry out safe and reliable's tunnel 4 construction under different geological topography conditions.
The steel sheet pile 9 is fixedly connected with the outer slide-resistant pile 3.
In this embodiment, by the fixed connection between the steel sheet piles 9 and the outer side anti-slide piles 3, it is convenient to connect a plurality of outer side anti-slide piles 3 outside the mountain 1 into a whole, thereby facilitating the combined support between the outer side anti-slide piles 3 and the steel sheet piles 9.
The section of the outer side slide-resistant pile 3 is isosceles trapezoid, and the distance between the outer side slide-resistant pile 3 and the outer side slide-resistant pile 3 is 50-80 cm.
In this embodiment, the outer slide piles 3 having isosceles trapezoid cross sections and the distance between the outer slide piles 3 and the outer slide piles 3 is 50-80cm, which facilitates the formation of the inter-pile soil arch effect between the outer slide piles 3 and the outer slide piles 3.
The cross section of the inner slide-resistant pile 2 is rectangular, and the distance between the inner slide-resistant pile 2 and the inner slide-resistant pile 2 is 50-80 cm. The height of the pile top of the inner side slide-resistant pile 2 from the ground surface is 30cm, and a reinforcing steel bar 10 with the length of 30cm is reserved at the pile top of the inner side slide-resistant pile 2.
In the embodiment, the inner slide-resistant piles 2 with rectangular cross sections and the distance between the inner slide-resistant piles 2 and the inner slide-resistant piles 2 are 50-80cm, so that the inter-pile soil arch effect between the inner slide-resistant piles 2 and the inner slide-resistant piles 2 can be conveniently exerted. The length of the steel bar 10 reserved on the pile top of the inner side anti-slide pile 2 is 30cm, so that concrete can be poured conveniently to form the locking port reinforcing beam 5.
The fore shaft reinforcing beam 5 is a reinforced concrete structure formed by integrally pouring the reinforcing steel bars 10 in the height of the reinforcing steel bars 10 with the length of 30cm reserved at the pile top of the anti-slide pile 2 at the inner side.
In the embodiment, a plurality of inner anti-slide piles 2 are connected into a whole conveniently through the fore shaft reinforcing beam 5; meanwhile, a reinforced concrete structure formed by pouring concrete in the height range of the steel bars 10 reserved at the top end of the inner slide-resistant pile 2 is convenient for capping and reinforcing the pile top of the inner slide-resistant pile 2.
The pile body of the inner slide-resistant pile 2 is provided with a small hole 11 for the small guide pipe 7 to pass through, the small hole 11 is close to the top end of the inner slide-resistant pile 2, and the diameter of the small hole 11 is 45-50 mm.
In this embodiment, the end of the small pipe 7 is facilitated to extend through the side wall of the inner slide pile 2 into the mountain 1 through the small hole 11.
A water intercepting gutter 12 close to the top end of the inner side anti-slide pile 2 is excavated in the direction vertical to the cross slope of the mountain 1, and the size of the water intercepting gutter 12 is 40cm multiplied by 30 cm. A drainage pipe 13 with the end part close to the intercepting gutter 12 is arranged in the inner downslope of the slope body of the mountain body 1.
In the present embodiment, the intercepting gutter 12 facilitates sufficient drainage of surface water and ground water, so that it is possible to prevent the ground water from infiltrating into the tunnel 4.
The working principle is as follows: before tunnel 4 construction is carried out, a plurality of inner side slide-resistant piles 2 are applied to the inner side of the mountain body 1 in the vertical direction, counterforce is conveniently applied to the inner side of the mountain body 1, so that the side pressure of surrounding rocks on the inner side of the mountain body 1 in the tunnel 4 excavation process is reduced, and the vault sinking of the tunnel 4 in the tunnel 4 construction process is conveniently and effectively prevented. Through outside friction pile 3, be convenient for exert the counter-force to the massif 1 outside to be convenient for reduce the pressure of inclining to one side of massif 1 outside country rock in the 4 work progress in tunnel, thereby be convenient for increase the stability of massif 1 outside slope. The pile tops of a plurality of inner side slide-resistant piles 2 positioned at the inner side of the mountain body 1 are conveniently connected into a whole through the locking port reinforcing beam 5. Meanwhile, the pile top of the inner side slide-resistant pile 2 is conveniently capped and reinforced through the locking port reinforcing beam 5. The guide pipe 6 is convenient for guiding the small guide pipe 7 to extend into the mountain body 1 through the side wall of the inner side slide-resistant pile 2. Through little pipe 7, be convenient for carry out slip casting work and form the slip casting body 8 that is located mountain 1 and is close to inboard friction pile 2 lateral wall to be convenient for consolidate the ground body in the mountain 1, thereby make and form space joint supporting construction between inboard friction pile 2, outside friction pile 3 and the little pipe 7. Through the joint supporting structure that inboard friction pile 2, outside friction pile 3, fore shaft reinforcing beam 5, stand pipe 6, little pipe 7 and slip casting body 8 constitute, can effectively consolidate the ground body of massif 1, thereby strengthen the stability of massif 1, reduce the destruction of tunnel 4 construction to massif 1, protect natural ecological environment, can effectively reduce tunnel 4's country rock pressure simultaneously, incline pressure and prevent that tunnel 4 vault from sinking, thereby can adapt to and carry out safe and reliable's tunnel 4 construction under different geological topography conditions.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a shallow supporting construction that unites in bias voltage section space of burying of entrance to a cave which characterized by: the anti-skidding pile structure comprises a plurality of inner side anti-skidding piles (2) which are positioned on the inner side of a mountain body (1) and are arranged at intervals in the vertical direction, a plurality of outer side anti-skidding piles (3) which are positioned on the outer side of the mountain body (1) and are arranged at intervals in the vertical direction, and a tunnel (4) which is positioned between the inner side anti-skidding piles (2) and the outer side anti-skidding piles (3); the top ends of the inner side anti-slide piles (2) are connected with a locking port reinforcing beam (5); steel sheet piles (9) are arranged between the outer side anti-slide piles (3); the top end of the outer side slide-resistant pile (3) is provided with a guide pipe (6), the guide pipe (6) is arranged in the horizontal direction, and the end part of the guide pipe (6) is close to the side wall of the inner side slide-resistant pile (2); a small guide pipe (7) penetrates through the guide pipe (6), and the end part of the small guide pipe (7) penetrates through the side wall of the inner side slide-resistant pile (2) and extends into the mountain body (1); the end part of the small guide pipe (7) located in the mountain body (1) is connected with a grouting body (8) formed through grouting, and the grouting body (8) is close to the side wall of the inner side slide-resistant pile (2).
2. The combined supporting structure of the shallow-buried bias section space of the hole as claimed in claim 1, wherein: and the steel sheet pile (9) is fixedly connected with the outer side anti-slide pile (3).
3. The combined supporting structure of the shallow-buried bias section space of the hole as claimed in claim 1, wherein: the cross section of the outer side slide-resistant piles (3) is isosceles trapezoid, and the distance between the outer side slide-resistant piles (3) and the outer side slide-resistant piles (3) is 50-80 cm.
4. The combined supporting structure of the shallow-buried bias section space of the hole as claimed in claim 1, wherein: the section of the inner side slide-resistant pile (2) is rectangular, and the distance between the inner side slide-resistant pile (2) and the inner side slide-resistant pile (2) is 50-80 cm; the height of the pile top of the inner side slide-resistant pile (2) from the ground surface is 30cm, and a reinforcing steel bar (10) with the length of 30cm is reserved at the pile top of the inner side slide-resistant pile (2).
5. The combined supporting structure of the shallow-buried bias section space of the hole as claimed in claim 4, wherein: the fore shaft reinforcing beam (5) is a reinforced concrete structure formed by integrally pouring reinforcing steel bars (10) in the height of reinforcing steel bars with the length of 30cm reserved at the pile top of the anti-slide pile (2) on the inner side.
6. The combined supporting structure of the shallow-buried bias section space of the hole as claimed in claim 1, wherein: the pile body of the inner side slide-resistant pile (2) is provided with a small hole (11) for the small guide pipe (7) to pass through, the small hole (11) is close to the top end of the inner side slide-resistant pile (2), and the diameter of the small hole (11) is 45-50 mm.
7. The combined supporting structure of the shallow-buried bias section space of the hole as claimed in claim 1, wherein: a water intercepting gutter (12) close to the top end of the inner side anti-slide pile (2) is arranged in the direction perpendicular to the cross slope of the mountain body (1), and the size of the water intercepting gutter (12) is 40cm multiplied by 30 cm; and a drainage pipe (13) with the end part close to the water intercepting gutter (12) is arranged in the inner downslope of the slope body of the mountain body (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920729232.9U CN209942821U (en) | 2019-05-21 | 2019-05-21 | Shallow supporting construction that unites in bias voltage section space that buries in entrance to a cave |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920729232.9U CN209942821U (en) | 2019-05-21 | 2019-05-21 | Shallow supporting construction that unites in bias voltage section space that buries in entrance to a cave |
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| CN209942821U true CN209942821U (en) | 2020-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043271A (en) * | 2019-05-21 | 2019-07-23 | 福建工程学院 | A kind of hole Shallow-buried section spaces union supporting construction and its construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110043271A (en) * | 2019-05-21 | 2019-07-23 | 福建工程学院 | A kind of hole Shallow-buried section spaces union supporting construction and its construction method |
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