CN214616532U - Tunnel construction pilot tunnel constructional device - Google Patents
Tunnel construction pilot tunnel constructional device Download PDFInfo
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- CN214616532U CN214616532U CN202120875997.0U CN202120875997U CN214616532U CN 214616532 U CN214616532 U CN 214616532U CN 202120875997 U CN202120875997 U CN 202120875997U CN 214616532 U CN214616532 U CN 214616532U
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Abstract
The utility model provides a tunnel construction pilot tunnel structure, which comprises a first pilot tunnel, a second pilot tunnel and a middle rock wall; the second pilot tunnel and the first pilot tunnel are horizontally arranged at intervals, and the excavation depth of the second pilot tunnel is smaller than or larger than that of the first pilot tunnel; a drainage channel is arranged on the middle rock wall, the drainage channel is provided with a water inlet end and a water outlet end, when the excavation depth of the second pilot tunnel is smaller than that of the first pilot tunnel, the water outlet end is communicated with the excavated section of the first pilot tunnel, and the water inlet end obliquely extends to a water accumulation section behind the non-excavated section of the second pilot tunnel; when the excavation depth of the second pilot tunnel is larger than that of the first pilot tunnel, the water outlet end is communicated with the excavated section of the second pilot tunnel, and the water inlet end obliquely extends to the ponding section behind the non-excavated section of the first pilot tunnel. The utility model provides a pair of tunnel construction pilot tunnel structure can improve the drainage efficiency of the solution cavity that tunnelling the place ahead appears, reduces its influence to the construction progress.
Description
Technical Field
The utility model belongs to the technical field of the tunnel construction, concretely relates to tunnel construction pilot tunnel structure.
Background
In the construction of a mountain tunnel, a solution cavity in front of tunneling can be often found when a tunnel face of a pilot tunnel is probed in front, a drain hole is drilled on the tunnel face usually under the condition, the tunneling operation can be continued after accumulated water in the solution cavity is drained through the drain hole, otherwise, water gushing and mud outburst risks are easy to occur, but due to the fact that water flow needs to be discharged to the outside of the pilot tunnel through an excavation section of the pilot tunnel, equipment in the pilot tunnel under construction needs to be transferred, a drainage channel is arranged at the excavation section of the pilot tunnel, the workload is large, time is wasted, and an overlarge drain hole is not drilled on the tunnel face, the drainage efficiency is low, a large amount of construction time is further occupied, and the construction progress is seriously affected.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a tunnel construction pilot tunnel structure aims at improving the ponding discharge efficiency when the solution cavity appears in construction the place ahead.
In order to achieve the above object, the utility model adopts the following technical scheme: the tunnel construction pilot tunnel structure comprises a first pilot tunnel, a second pilot tunnel and a middle rock wall; the second pilot tunnel and the first pilot tunnel are horizontally arranged at intervals, and the excavation depth of the second pilot tunnel is smaller than or larger than that of the first pilot tunnel; the middle rock wall is positioned between the first pilot tunnel and the second pilot tunnel, two side walls of the middle rock wall are respectively the tunnel walls of the first pilot tunnel and the second pilot tunnel which are close to each other, a water drainage channel is arranged on the middle rock wall, and the water drainage channel penetrates through the middle rock wall along the direction which is inclined to the axial direction of the first pilot tunnel or the second pilot tunnel; the water drainage channel is provided with a water inlet end and a water outlet end, when the excavation depth of the second pilot tunnel is smaller than that of the first pilot tunnel, the water outlet end is communicated with the excavated section of the first pilot tunnel, and the water inlet end obliquely extends to a water accumulation section behind the non-excavated section of the second pilot tunnel; when the excavation depth of the second pilot tunnel is larger than that of the first pilot tunnel, the water outlet end is communicated with the excavated section of the second pilot tunnel, and the water inlet end obliquely extends to the ponding section behind the non-excavated section of the first pilot tunnel.
In a possible implementation mode, the water drainage channel has a water outlet gradient of 1-3 degrees from the water inlet end to the water outlet end.
In a possible implementation manner, a buffer wall is arranged at the position of the first guide hole or the second guide hole, which is located at the water outlet end of the drainage channel.
In some embodiments, one end of the buffer wall abuts against the side wall of the middle rock wall along the extending direction of the drainage channel, and the other end of the buffer wall is bent in an arc shape and extends towards the mouth of the first guide hole or the second guide hole along the axial direction of the middle rock wall.
The buffer wall comprises a foundation part buried under the ground of the first pilot tunnel or the second pilot tunnel, and a water retaining part integrally cast with the foundation part, wherein the water retaining part and the foundation part are of an inverted T-shaped or L-shaped structure.
In a possible implementation mode, pipe shed structures are embedded and supported on the peripheries of the two ends of the water drainage channel.
In some embodiments, an outward-expanding groove is arranged on the inner wall of the drainage channel close to the water inlet end of the drainage channel, and the width of the outward-expanding groove along the extension direction of the drainage channel is greater than the length of the pipe shed structure.
Illustratively, the pipe shed structure includes a plurality of shed pipes circumferentially spaced around the water inlet end and the water outlet end along the water drainage channel.
For example, the shed pipe comprises a seamless steel pipe, a steel reinforcement cage and filling cement; one end of the seamless steel pipe is plugged by a reinforced hoop plate, the other end of the seamless steel pipe is in a pointed cone type closed structure, and a plurality of groups of grouting holes suitable for cement mortar to pass through are formed in the peripheral wall of the seamless steel pipe at intervals along the axial direction of the seamless steel pipe; the reinforcement cage is arranged inside the seamless steel tube in a penetrating manner along the axial direction of the seamless steel tube; the filling cement is formed by the coagulation of cement mortar which is poured into the seamless steel pipe through each group of grouting holes.
Illustratively, the reinforcement cage comprises a plurality of fixing rings which are distributed at intervals along the axial direction of the seamless steel pipe and a plurality of reinforcing ribs which are distributed at intervals along the circumferential direction of the fixing rings; wherein, many strengthening ribs respectively with the solid fixed ring's of each periphery wall welded fastening.
The utility model provides a pair of tunnel construction pilot tunnel structure's beneficial effect lies in: compared with the prior art, the utility model relates to a tunnel construction pilot tunnel structure, first pilot tunnel and second pilot tunnel are the construction of tunnelling in turn, when meetting the ponding section in the front of tunnelling, through seting up the sluicing passageway on well rock-wall, will excavate the ponding behind the unearthed section of first pilot tunnel or second pilot tunnel that the excavation depth is less and discharge into second pilot tunnel or the first pilot tunnel that the excavation depth is great through the sluicing passageway, thereby realize will be in the ponding behind the first pilot tunnel or the second pilot tunnel of construction state and discharge into the second pilot tunnel or the first pilot tunnel of non-construction state and discharge, need not to shift construction equipment and set up the drainage channel in addition, thereby can reduce work load, save the construction time, and can set up the sluicing passageway that the cross-sectional area is great on well rock-wall, for the mode of getting the wash port at the tunnel face can improve the discharge efficiency of ponding, reduce drainage latency, reduce the influence to the construction progress when the solution cavity appears in construction the place ahead.
Drawings
Fig. 1 is a schematic structural diagram of a tunnel construction pilot tunnel structure provided in an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure view of a buffer wall according to an embodiment of the present invention;
fig. 3 is a schematic end-face structure view of a water discharge passage according to an embodiment of the present invention;
fig. 4 is a schematic axial sectional structure view of a water discharge passage according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a canopy pipe used in the embodiment of the present invention;
fig. 6 is the schematic view of the end face structure of the steel reinforcement cage according to the embodiment of the present invention.
In the figure: 10. a first pilot hole; 11. an excavated segment; 12. a non-excavated section; 13. a water accumulation section; 20. a second pilot hole; 30. a middle rock wall; 40. a drainage channel; 401. a water outlet end; 402. a water inlet end; 403. an outward-expanding groove; 41. a pipe shed structure; 411. a shed pipe; 4111. seamless steel pipes; 4112. a reinforcement cage; 4113. filling cement; 4114. a fixing ring; 4115. reinforcing ribs; 4116. a reinforced hoop plate; 50. a buffer wall; 51. a base portion; 52. a water-retaining part.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a tunnel construction pilot tunnel structure provided by the present invention will now be described. The tunnel construction pilot tunnel structure comprises a first pilot tunnel 10, a second pilot tunnel 20 and a middle rock wall 30; the second pilot tunnel 20 and the first pilot tunnel 10 are horizontally arranged at intervals, and the excavation depth of the second pilot tunnel 20 is smaller than or larger than that of the first pilot tunnel 10; the middle rock wall 30 is positioned between the first pilot tunnel 10 and the second pilot tunnel 20, two side walls of the middle rock wall 30 are respectively the tunnel walls of the first pilot tunnel 10 and the second pilot tunnel 20 which are close to each other, a drainage channel 40 is arranged on the middle rock wall 30, and the drainage channel 40 penetrates through the middle rock wall 30 along the direction which is inclined to the axial direction of the first pilot tunnel 10 or the second pilot tunnel 20; the water drainage channel 40 is provided with a water inlet end 402 and a water outlet end 401, when the excavation depth of the second pilot tunnel 20 is smaller than the excavation depth of the first pilot tunnel 10, the water outlet end 401 is communicated with the excavated section 11 of the first pilot tunnel 10, and the water inlet end 402 obliquely extends to a water accumulation section 13 positioned behind the non-excavated section 12 of the second pilot tunnel 20; when the excavation depth of the second pilot tunnel 20 is larger than the excavation depth of the first pilot tunnel 10, the water outlet end 401 is communicated with the excavated section 11 of the second pilot tunnel 20, and the water inlet end 402 extends obliquely to the water accumulation section 13 behind the non-excavated section 12 of the first pilot tunnel 10.
It should be noted that the first pilot tunnel 10 and the second pilot tunnel 20 are two parallel pilot tunnels that are alternately tunneled, and the "first" and the "second" are only used for convenience of description, and the two parallel pilot tunnels are also often referred to as a "left pilot tunnel" and a "right pilot tunnel" in actual construction. The middle rock wall 30 is a rock interlayer between two up-and-down tunnels or pilot tunnels, as an engineering term, and will not be explained here.
In addition, it should be understood that, in this case, the first pilot tunnel 10 and the second pilot tunnel 20 are alternately excavated, that is, when the excavation depth of the first pilot tunnel 10 is greater than the excavation depth of the second pilot tunnel 20 and a cavern appears in front of the excavation (the cavern usually appears in front of the excavation of the first pilot tunnel 10 and the second pilot tunnel 20 at the same time), the excavating equipment is transferred into the pilot tunnel with the smaller excavation depth, and the accumulated water section 13 appearing in front of the pilot tunnel with the smaller excavation depth (i.e., behind the unearthed section 12) is communicated with the pilot tunnel with the larger excavation depth through the drainage channel 40, and after the accumulated water is discharged, the excavation depth of the pilot tunnel is necessarily greater than that of the other pilot tunnel until the excavating equipment is excavated to be close to the next accumulated water section 13, and then the excavating equipment is transferred into the other pilot tunnel, and the other pilot tunnel is used as the pilot tunnel with the smaller excavation depth again, and the drainage channel 40 is reestablished to drain water, and the construction is alternated.
Compared with the prior art, the tunnel construction pilot tunnel structure provided by the embodiment has the advantages that the first pilot tunnel 10 and the second pilot tunnel 20 are alternately constructed in a tunneling manner, when the water accumulation section 13 is encountered in front of tunneling, the drainage channel 40 is arranged on the middle rock wall 30, the accumulated water behind the unearthed section 12 of the first pilot tunnel 10 or the second pilot tunnel 20 with smaller excavation depth is drained into the second pilot tunnel 20 or the first pilot tunnel 10 with larger excavation depth through the drainage channel 40, so that the accumulated water behind the first pilot tunnel 10 or the second pilot tunnel 20 in a construction state is drained into the second pilot tunnel 20 or the first pilot tunnel 10 in a non-construction state for drainage, the construction equipment does not need to be transferred, a drainage channel is not additionally arranged, the workload can be reduced, the construction time can be saved, the drainage channel 40 with larger cross-section area can be arranged on the middle rock wall 30, and the drainage efficiency of the accumulated water in a pilot tunnel face can be improved, reduce drainage latency, reduce the influence to the construction progress when construction the place ahead presented the molten cavity.
In the present embodiment, the drainage channel 40 has a water outlet slope of 1-3 ° from the water inlet end 402 to the water outlet end 401. Through setting up the play water slope, can improve drainage efficiency to shorten drainage time, reduce the influence to the construction progress.
In some embodiments, referring to fig. 1 and fig. 2, a buffering wall 50 is disposed at a position of the first guide hole 10 or the second guide hole 20 at the water outlet end 401 of the drainage channel 40. The height of the buffer wall 50 should be higher than the outlet height of the drainage channel 40 to ensure that the water flow can be completely blocked, so as to prevent the water flow from directly scouring the tunnel wall after being discharged from the water outlet end 401, and to provide a good protection effect for the first guide tunnel 10 or the second guide tunnel 20.
As an embodiment of the buffering wall 50, please refer to fig. 1, one end of the buffering wall 50 abuts against the side wall of the middle rock wall 30 along the extending direction of the drainage channel 40, and the other end is bent in an arc shape and extends toward the mouth of the first guide hole 10 or the second guide hole 20 along the axial direction of the middle rock wall 30. One end of the buffering wall 50 is abutted to the middle rock wall 30 (specifically, the buffering wall is connected with the middle rock wall 30 in a sealing mode through cement paste), so that water flow can be guided to flow along a groove-shaped space formed by the buffering wall 50 and the side wall of the middle rock wall 30, and the other end of the buffering wall 50 extends towards the opening of the pilot tunnel after being bent in an arc mode, so that the water flow can be guided to the outside of the pilot tunnel smoothly, the phenomenon that the tunnel face is soaked due to the fact that the water flow contacts with the tunnel face of the pilot tunnel is avoided, the strength is reduced, and construction safety and reliability are guaranteed. It should be understood that the extending end of the buffering wall 50 need not extend to the opening of the pilot tunnel, and only needs to extend a certain distance (15-20 m), so that the workload can be reduced and the efficiency can be improved on the premise of avoiding the backflow of water flow to the tunnel face.
Optionally, referring to fig. 2, the buffering wall 50 includes a foundation portion 51 buried under the ground of the first pilot tunnel 10 or the second pilot tunnel 20, and a water blocking portion 52 integrally cast with the foundation portion 51, wherein the water blocking portion 52 and the foundation portion 51 are of an inverted T-shaped or L-shaped structure. Bury foundation portion 51 underground, form the groove of guide rivers through the lateral wall of manger plate portion 52 and well rock-wall 30, because foundation portion 51's width is great (the bottom broad of type of falling T or L), bury behind the underground stability strong, can resist the impact force of rivers, and the arrangement of buffer wall 50 is simple and convenient, compares in the mode of digging out the escape canal, and is more efficient swift.
As another modified embodiment of the drainage channel 40, please refer to fig. 3 and 4, a pipe shed structure 41 is embedded and supported on the periphery of both ends of the drainage channel 40. The pipe shed structure 41 is implanted after the periphery of the water drainage channel 40 is drilled, and then the pipe shed structure is fixed through filling and sealing cement paste, so that the strength of the water drainage channel 40 is improved, particularly the supporting strength of two ends is improved, the water drainage channel 40 is prevented from collapsing, and the construction safety and reliability are ensured.
In some possible implementations, referring to fig. 3 to 6, an expanded groove 403 is provided on an inner wall of the drainage channel 40 near the water inlet end 402 thereof, and a width of the expanded groove 403 along an extending direction of the drainage channel 40 is greater than a length of the pipe shed structure 41. Because the water inlet end 402 of the drainage channel 40 belongs to the trenchless section 12, the inner wall close to the water inlet end 402 is provided with the outward-expanding groove 403, then the wall of the outward-expanding groove 403 is perforated towards the wall of the water inlet end 402, and then the pipe shed structure 41 is implanted and fixed by grouting, so that the operation mode is flexible and convenient.
Specifically, referring to fig. 3, the pipe shed structure 41 includes a plurality of shed pipes 411 distributed at intervals along the circumference of the water drainage channel 40 at the periphery of the water inlet end 402 and the water outlet end 401. The supporting is formed by the shed pipes 411 distributed at the periphery of the hole at intervals, so that the peripheral rocks of the pilot tunnel are connected into a whole, the structural strength of the pilot tunnel is improved, and the construction is convenient.
Illustratively, referring to fig. 5, the shed pipe 411 includes a seamless steel pipe 4111, a steel reinforcement cage 4112, and a filling cement 4113; one end of the seamless steel tube 4111 is blocked by a reinforced hoop plate 4116, the other end of the seamless steel tube 4111 is in a pointed cone-shaped closed structure, and a plurality of groups of grouting holes suitable for cement mortar to pass through are formed in the circumferential wall of the seamless steel tube 4111 at intervals along the axial direction; the reinforcement cage 4112 penetrates through the seamless steel tube 4111 along the axial direction of the seamless steel tube 4111; the filling cement 4113 is formed by the coagulation of cement mortar which is poured into the seamless steel tube 4111 through each group of grouting holes. The steel reinforcement cage 4112 and the filling cement 4113 are equivalent to a structure for forming reinforced concrete, and then the seamless steel tube 4111 is sleeved on the periphery of the reinforced concrete, so that the surface quality of the reinforced concrete is improved, the smooth penetration is ensured, the damage caused by surface collision is avoided, and the integrity of the shed tube 411 is improved; through interlude steel reinforcement cage 4112 in to seamless steel pipe 4111 when the preparation, then through grout hole to the inside filling cement mortar of seamless steel pipe 4111, can form integrative structure after waiting the cement mortar condensation, the manufacturing process is simple and convenient, and structural strength is high.
Optionally, referring to fig. 5 and fig. 6, in the embodiment, the reinforcement cage 4112 includes a plurality of fixing rings 4114 spaced apart along an axial direction of the seamless steel tube 4111, and a plurality of reinforcing ribs 4115 spaced apart along a circumferential direction of the fixing rings 4114; wherein, many strengthening ribs 4115 are welded and fixed with the periphery wall of each solid fixed ring 4114 respectively. Strengthening rib 4115 can adopt the twisted steel intercepting to form, and simple structure is stable, and intensity is big, and the filling cement 4113 bonding property who solidifies with cement mortar and form is strong to can improve canopy pipe 411's bulk strength, ensure to strut safe and reliable.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a tunnel construction pilot tunnel structure which characterized in that includes:
a first pilot hole;
the second pilot tunnel and the first pilot tunnel are horizontally arranged at intervals, and the excavation depth of the second pilot tunnel is smaller than or larger than that of the first pilot tunnel;
the middle rock wall is positioned between the first pilot tunnel and the second pilot tunnel, two side walls of the middle rock wall are respectively walls of the first pilot tunnel and the second pilot tunnel which are close to each other, a drainage channel is arranged on the middle rock wall, and the drainage channel penetrates through the middle rock wall along the direction which is inclined to the axial direction of the first pilot tunnel or the second pilot tunnel;
the drainage channel is provided with a water inlet end and a water outlet end, when the excavation depth of the second pilot tunnel is smaller than that of the first pilot tunnel, the water outlet end is communicated with the excavated section of the first pilot tunnel, and the water inlet end obliquely extends to a water accumulation section behind the non-excavated section of the second pilot tunnel; when the excavation depth of the second pilot tunnel is larger than that of the first pilot tunnel, the water outlet end is communicated with the excavated section of the second pilot tunnel, and the water inlet end obliquely extends to the water accumulation section behind the unearthed section of the first pilot tunnel.
2. The tunnel construction pilot tunnel structure of claim 1, wherein the drainage channel has a water outlet slope of 1-3 ° from the water inlet end to the water outlet end.
3. A tunnel construction pilot tunnel structure according to claim 1, characterized in that a buffer wall is provided at a position of the first pilot tunnel or the second pilot tunnel at the water outlet end of the drainage passage.
4. A tunnel construction pilot tunnel structure according to claim 3, wherein one end of said buffering wall abuts against a side wall of said middle rock wall in an extending direction of said drainage passage, and the other end thereof is bent in an arc and extends toward a mouth of said first pilot tunnel or said second pilot tunnel in an axial direction of said middle rock wall.
5. A tunnel construction pilot tunnel structure of claim 3, wherein the buffer wall includes a foundation portion for being buried under the ground of the first pilot tunnel or the second pilot tunnel, and a water blocking portion integrally cast with the foundation portion, the water blocking portion and the foundation portion having an inverted T-shaped or L-shaped structure.
6. A tunnel construction pilot tunnel structure of any one of claims 1-5, characterized in that the periphery of both ends of the drainage channel is embedded with and supported with a pipe shed structure.
7. A tunnel construction pilot tunnel structure of claim 6, characterized in that the inner wall of said sluicing channel near the water inlet end thereof is provided with an outward-expanding groove, and the width of said outward-expanding groove along the extending direction of said sluicing channel is larger than the length of said pipe shed structure.
8. A tunnel construction pilot tunnel structure of claim 7, wherein said pipe shed structure includes a plurality of shed pipes spaced around the periphery of said water inlet end and said water outlet end along the circumference of said drainage channel.
9. A tunnel construction pilot tunnel structure according to claim 8, said canopy pipe comprising:
one end of the seamless steel pipe is plugged by a reinforced hoop plate, the other end of the seamless steel pipe is of a pointed cone type closed structure, and a plurality of groups of grouting holes suitable for cement mortar to pass through are formed in the peripheral wall of the seamless steel pipe at intervals along the axial direction of the seamless steel pipe;
the steel reinforcement cage penetrates through the seamless steel tube along the axial direction of the seamless steel tube;
and filling cement, wherein the cement mortar poured into the seamless steel pipe through each group of grouting holes is formed by coagulation.
10. A tunnel construction pilot tunnel structure of claim 9, said reinforcement cage comprising:
the fixing rings are distributed at intervals along the axial direction of the seamless steel pipe;
many strengthening ribs, follow gu fixed ring's circumference interval distribution, and many the strengthening rib respectively with each gu fixed ring's periphery wall welded fastening.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120875997.0U CN214616532U (en) | 2021-04-26 | 2021-04-26 | Tunnel construction pilot tunnel constructional device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120875997.0U CN214616532U (en) | 2021-04-26 | 2021-04-26 | Tunnel construction pilot tunnel constructional device |
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| CN214616532U true CN214616532U (en) | 2021-11-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113863981A (en) * | 2021-11-16 | 2021-12-31 | 中国建筑第七工程局有限公司 | Water draining method for water burst of water-rich karst tunnel |
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2021
- 2021-04-26 CN CN202120875997.0U patent/CN214616532U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113863981A (en) * | 2021-11-16 | 2021-12-31 | 中国建筑第七工程局有限公司 | Water draining method for water burst of water-rich karst tunnel |
| CN113863981B (en) * | 2021-11-16 | 2023-08-18 | 中国建筑第七工程局有限公司 | Water draining method for water-rich karst tunnel water burst |
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