CN109973147B - Construction method of highway tunnel drainage ditch - Google Patents

Construction method of highway tunnel drainage ditch Download PDF

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Publication number
CN109973147B
CN109973147B CN201910175461.5A CN201910175461A CN109973147B CN 109973147 B CN109973147 B CN 109973147B CN 201910175461 A CN201910175461 A CN 201910175461A CN 109973147 B CN109973147 B CN 109973147B
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China
Prior art keywords
drainage
tunnel
pipe
water collecting
concrete
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CN201910175461.5A
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CN109973147A (en
Inventor
赵立财
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Third Engineering Co Ltd of China Railway 19th Bureau Group Co Ltd
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Third Engineering Co Ltd of China Railway 19th Bureau Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/14Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F16/00Drainage
    • E21F16/02Drainage of tunnels

Abstract

The invention discloses a construction method of a drainage ditch of a highway tunnel, which solves the problems that the drainage ditch of the highway tunnel with the prior structure is easy to seep water and unsmooth in drainage in a cable groove. The position of a drainage ditch groove in the highway tunnel is moved downwards to the bottom of an inverted arch from the inside of a secondary lining above the traditional inverted arch, namely the drainage ditch groove is moved to the outside of a closed-loop tunnel formed by an arch wall secondary lining and an inverted arch secondary lining, so that a transverse drainage pipe avoids a cable trough; water collecting wells are arranged on the drainage ditch at intervals along the direction of the tunnel, so that the water collecting wells are communicated with the longitudinal drainage pipe, and a standby channel is provided for accumulated water between the primary support and the secondary lining; the longitudinal drain pipe and the transverse drain pipe are connected together at an angle of 135 degrees, so that drainage between the primary support and the secondary lining is smoother; the seepage water around the path of the transverse drainage pipe enters the transverse drainage pipe through the inverted filter layer and the geotextile, so that the probability of blockage is reduced, and the drainage effect is enhanced.

Description

Construction method of highway tunnel drainage ditch
Technical Field
The invention relates to a construction method of a drainage ditch in a highway tunnel, in particular to a structure of a drainage ditch of a highway tunnel, which is characterized in that a perforated pipe in a blind underdrain bears a longitudinal drainage pipe, and a construction method thereof.
Background
In the prior art, a drainage ditch is arranged in a closed-loop tunnel formed by an arch wall secondary lining and an inverted arch secondary lining of a highway tunnel, and a cable groove is generally arranged between the drainage ditch and the side wall of the secondary lining; longitudinal drain pipes are arranged between the primary support and the secondary lining of the highway tunnel at intervals along the direction of the tunnel so as to drain accumulated water between the two linings; be provided with horizontal drain pipe between escape canal and vertical drain pipe, horizontal drain pipe will pass secondary lining in proper order and cable duct back and communicate together with the escape canal, and this kind of conventional mode of laying has the following problem: (1) the drainage ditch is arranged on the inverted arch surface in the tunnel, occupies the limit of the tunnel pavement and narrows the tunnel pavement; (2) the transverse drainage pipe is constructed in two stages, firstly, a part of pipe joints are pre-buried between a secondary lining and a cable groove, then, when the cable groove is constructed, the rest part of pipe joints are communicated into a drainage groove, the joint of the transverse drainage pipe is arranged in the cable groove, and as the joint is not constructed tightly and is used for a long time, the phenomenon that the joint of the transverse drainage pipe seeps into the cable groove frequently occurs, so that the electric leakage accident of the cable groove is caused; (3) in the long-term use process of the longitudinal drainage pipe of the tunnel, the longitudinal drainage pipe is easy to block, so that accumulated water between the primary support and the secondary lining cannot be normally drained; (4) the transverse drainage pipe only plays a role in guiding accumulated water between the primary support and the secondary lining to a drainage ditch, and cannot play a role in guiding and draining seepage water around the path of the transverse drainage pipe into the drainage ditch; (5) the transverse drain pipe and the longitudinal drain pipe are connected together in the same horizontal plane at a corner of 90 degrees, accumulated water in the longitudinal drain pipe cannot smoothly enter the drainage groove, and the corner of 90 degrees is easily blocked by sediments.
Disclosure of Invention
The invention provides a construction method of a drainage ditch of a highway tunnel, which solves the technical problems that the drainage ditch of the highway tunnel with the existing structure is easy to seep water and is not smooth in drainage in a cable groove.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: the position of a drainage ditch groove in the highway tunnel is moved downwards to the bottom of an inverted arch from the inside of a secondary lining above the traditional inverted arch, namely the drainage ditch groove is moved to the outside of a closed-loop tunnel formed by an arch wall secondary lining and an inverted arch secondary lining, so that a transverse drainage pipe avoids a cable trough; water collecting wells are arranged on the drainage ditch at intervals along the direction of the tunnel, so that the water collecting wells are communicated with the longitudinal drainage pipe, and a standby channel is provided for accumulated water between the primary support and the secondary lining; the longitudinal drain pipe and the transverse drain pipe are connected together at an angle of 135 degrees, so that drainage between the primary support and the secondary lining is smoother; the seepage water around the path of the transverse drainage pipe enters the transverse drainage pipe through the inverted filter layer and the geotextile, so that the probability of blockage is reduced, and the drainage effect is enhanced.
A construction method of a drainage ditch of a highway tunnel is characterized by comprising the following steps:
after the excavation of the highway tunnel is finished, excavating a drainage ditch base groove at the inverted arch base, paving a concrete cushion layer on the inverted arch base between the drainage ditch base groove and tunnel surrounding rocks, and performing primary support on the concrete cushion layer;
secondly, constructing a drainage ditch support in the drainage ditch base groove, constructing a concrete base on the drainage ditch support, wrapping a drainage pipe with geotextile, fixing the drainage pipe on the concrete base, arranging non-sand concrete on a concrete cushion layer on the inner side of a primary support, fixing a tunnel longitudinal drainage pipe in the non-sand concrete, paving a gravel reverse filter layer on the concrete cushion layer, arranging a transverse drainage pipe on the gravel reverse filter layer, communicating one end of the transverse drainage pipe with the tunnel longitudinal drainage pipe, cutting the geotextile on a water inlet hole on the drainage pipe, communicating the other end of the transverse drainage pipe with the water inlet hole on the drainage pipe, and filling the gravel concrete in the drainage base groove;
thirdly, constructing a concrete foundation of the cable duct on the gravel reversed filter layer; arranging a water collecting well at intervals of 30 meters along the direction of the tunnel, arranging a drain hole connected with a drain ditch of the cable trough on the water collecting well, and communicating the water collecting well with the drain pipe; a water collecting well transverse drain pipe is connected in the water collecting well, the other end of the water collecting well transverse drain pipe is communicated with a tunnel longitudinal drain pipe, and a water collecting well cover plate is arranged at the top end of the water collecting well;
fourthly, constructing a secondary lining of the tunnel and a vertical wall on the inner side of the cable duct;
and fifthly, constructing a cable trough cover plate and an inverted arch in the tunnel.
And a drain pipe is arranged between the tunnel longitudinal drainage ditch and the drain pipe in the water-rich section.
A drainage ditch structure system for highway tunnel in water-rich area is composed of the inverted arch base of highway tunnel, drainage ditch slots on said inverted arch base, a concrete cushion is laid on the inverted arch base between the drainage ditch base groove and the tunnel surrounding rock, primary support of the tunnel is applied on the concrete cushion, a drainage ditch base groove is internally provided with a drainage ditch groove support, a concrete base is arranged on the drainage ditch groove support, a drainage pipe is arranged on the concrete base, a gravel reversed filter layer is paved on the concrete cushion layer, a transverse drainage pipe is arranged on the gravel reversed filter layer, one end of the transverse drainage pipe is communicated with the longitudinal drainage pipe of the tunnel, the other end of the transverse drainage pipe is communicated with a water inlet hole on the drainage pipe, the drainage foundation groove is filled with rubble concrete, and the top surface of the rubble concrete is provided with an inverted arch and a cable groove concrete foundation.
The concrete cushion layer on the inner side of the primary support is provided with sand-free concrete, and the sand-free concrete is provided with a tunnel longitudinal drain pipe; the drain pipe is wrapped with geotextile; a water collecting well is arranged along the direction of the tunnel at intervals of 30 meters, and a drain hole connected with a cable trough drain ditch is arranged on the water collecting well; a water collecting well transverse drain pipe is connected in the water collecting well, the other end of the water collecting well transverse drain pipe is communicated with a tunnel longitudinal drain pipe, and a water collecting well cover plate is arranged at the top end of the water collecting well; and a drain pipe is arranged between the longitudinal drainage ditch of the tunnel and the drainage pipe.
The drainage ditch is arranged on the outer side of the closed loop of the inverted arch and the secondary lining of the tunnel, so that the transverse drainage pipe and the cable ditch are not intersected; a water collecting well is arranged at intervals of 30 meters along the trend of the tunnel, a standby transverse drainage pipe between the water collecting well and a tunnel longitudinal drainage pipe is arranged to be blocked by a drainage pipeline arranged between two linings at the later stage, a standby channel is prepared, and accumulated water on the outer side of a secondary lining support of the tunnel can be smoothly drained into a drainage ditch.
Drawings
FIG. 1 is a schematic diagram of the general structure of the present invention;
FIG. 2 is a schematic view of the structure of the drain gutter of the present invention in a top view;
FIG. 3 is a first process diagram of the execution sequence of the present invention;
FIG. 4 is a second process diagram of the execution sequence of the present invention;
FIG. 5 is a third process sequence diagram of the execution sequence of the present invention;
FIG. 6 is a diagram of a fourth process step in the execution sequence of the present invention;
fig. 7 is a diagram of a fifth process in the execution sequence of the present invention.
Fig. 8 is a schematic view showing the structure of a drainage gutter in a water-rich area according to the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a construction method of a drainage ditch of a highway tunnel is characterized by comprising the following steps:
firstly, after a highway tunnel is excavated, excavating a drainage ditch base groove 3 at an inverted arch base 2, paving a concrete cushion layer 4 on the inverted arch base between the drainage ditch base groove 3 and tunnel surrounding rocks, and constructing a primary support 1 on the concrete cushion layer 4;
secondly, constructing a drainage ditch support 7 in the drainage ditch base groove 3, constructing a concrete base 8 on the drainage ditch support 7, wrapping a drain pipe 9 with geotextile 10, fixing the drain pipe on the concrete base 8, arranging sand-free concrete 6 on a concrete cushion layer 4 on the inner side of the primary support 1, fixing a tunnel longitudinal drain pipe 5 in the sand-free concrete 6, laying a broken stone inverted filter layer 13 on the concrete cushion layer 4, arranging a transverse drain pipe 14 on the broken stone inverted filter layer 13, communicating one end of the transverse drain pipe 14 with the tunnel longitudinal drain pipe 5, cutting the geotextile 10 on a water inlet hole 11 on the drain pipe 9, communicating the other end of the transverse drain pipe 14 with the water inlet hole 11 on the drain pipe 9, and filling rubble concrete 12 in the drainage ditch 3;
thirdly, constructing a cable trough concrete foundation 15 on the gravel reversed filter layer 13; a water collecting well 16 is arranged along the direction of the tunnel at intervals of 30 meters, a drain hole 24 connected with a drain ditch of the cable trough is arranged on the water collecting well 16, and the water collecting well 16 is communicated with the drain pipe 9; a water collecting well transverse drainage pipe 17 is connected in the water collecting well 16, the other end of the water collecting well transverse drainage pipe 17 is communicated with the tunnel longitudinal drainage pipe 5, and a water collecting well cover plate 18 is arranged at the top end of the water collecting well;
fourthly, constructing a secondary lining 19 of the tunnel and a vertical wall 20 at the inner side of the cable duct;
and fifthly, constructing a cable trough cover plate 21 and an inverted arch 22 in the tunnel.
A drain pipe 23 is arranged between the tunnel longitudinal drain 5 and the drain pipe 9 in the water-rich section.
A water-rich section highway tunnel drainage ditch structure system comprises a highway tunnel inverted arch base 2, a drainage ditch base groove 3 is dug on the highway tunnel inverted arch base 2, a concrete cushion layer 4 is laid on the inverted arch base between the drainage ditch base groove 3 and tunnel surrounding rocks, a tunnel primary support 1 is laid on the concrete cushion layer 4, the water-rich section highway tunnel drainage ditch structure system is characterized in that a drainage ditch base groove 7 is laid in the drainage ditch base groove 3, a concrete base 8 is arranged on the drainage ditch base groove 7, a drainage pipe 9 is arranged on the concrete base 8, a gravel reverse filter layer 13 is laid on the concrete cushion layer 4, a transverse drainage pipe 14 is arranged on the gravel reverse filter layer 13, one end of the transverse drainage pipe 14 is communicated with a tunnel longitudinal drainage pipe 5, the other end of the transverse drainage pipe 14 is communicated with a water inlet hole 11 on the drainage pipe 9, a piece of drainage stone concrete 12 is poured in the drainage base groove 3, an inverted arch 22 and a cable trough concrete foundation 15 are provided on the top surface of the slate concrete 12.
A sand-free concrete 6 is arranged on the concrete cushion 4 on the inner side of the primary support 1, and a tunnel longitudinal drain pipe 5 is arranged in the sand-free concrete 6; the drain pipe 9 is wrapped with geotextile 10; a water collecting well 16 is arranged along the direction of the tunnel at intervals of 30 meters, and a drain hole 24 connected with a cable trough drain ditch is arranged on the water collecting well 16; a water collecting well transverse drainage pipe 17 is connected in the water collecting well 16, the other end of the water collecting well transverse drainage pipe 17 is communicated with the tunnel longitudinal drainage pipe 5, and a water collecting well cover plate 18 is arranged at the top end of the water collecting well; a drain pipe 23 is provided between the tunnel vertical drain 5 and the drain pipe 9.

Claims (2)

1. A construction method of a drainage ditch of a highway tunnel is characterized by comprising the following steps:
firstly, after a highway tunnel is excavated, excavating a drainage ditch base groove (3) at an inverted arch base (2), paving a concrete cushion layer (4) on the inverted arch base between the drainage ditch base groove (3) and tunnel surrounding rocks, and constructing a primary support (1) on the concrete cushion layer (4);
secondly, constructing a drainage ditch support (7) in a drainage ditch base groove (3), constructing a concrete base (8) on the drainage ditch support (7), wrapping a drainage pipe (9) with geotextile (10), fixing the drainage pipe on the concrete base (8), arranging sand-free concrete (6) on a concrete cushion layer (4) at the inner side of a primary support (1), fixing a tunnel longitudinal drainage pipe (5) in the sand-free concrete (6), laying a gravel reverse filter layer (13) on the concrete cushion layer (4), arranging a transverse drainage pipe (14) on the gravel reverse filter layer (13), communicating one end of the transverse drainage pipe (14) with the tunnel longitudinal drainage pipe (5), cutting the geotextile (10) on a water inlet hole (11) on the drainage pipe (9), and then communicating the other end of the transverse drainage pipe (14) with the water inlet hole (11) on the drainage pipe (9), grouting rubble concrete (12) into the drainage ditch base groove (3);
thirdly, constructing a cable trough concrete foundation (15) on the gravel reverse filter layer (13); a water collecting well (16) is arranged along the direction of the tunnel at intervals of 30 meters, a drain hole (24) connected with a drain ditch of the cable trough is arranged on the water collecting well (16), and the water collecting well (16) is communicated with a drain pipe (9); a water collecting well transverse drain pipe (17) is connected in the water collecting well (16), the other end of the water collecting well transverse drain pipe (17) is communicated with the tunnel longitudinal drain pipe (5), and a water collecting well cover plate (18) is arranged at the top end of the water collecting well;
fourthly, constructing a secondary lining (19) of the tunnel and a vertical wall (20) at the inner side of the cable groove;
and fifthly, constructing a cable trough cover plate (21) and an inverted arch (22) in the tunnel.
2. A method for constructing a drainage channel of a road tunnel according to claim 1, wherein a drain pipe (23) is arranged between the longitudinal tunnel drainage pipe (5) and the drainage pipe (9) in the water-rich area.
CN201910175461.5A 2019-03-08 2019-03-08 Construction method of highway tunnel drainage ditch Active CN109973147B (en)

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Application Number Priority Date Filing Date Title
CN201910175461.5A CN109973147B (en) 2019-03-08 2019-03-08 Construction method of highway tunnel drainage ditch

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Application Number Priority Date Filing Date Title
CN201910175461.5A CN109973147B (en) 2019-03-08 2019-03-08 Construction method of highway tunnel drainage ditch

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CN109973147B true CN109973147B (en) 2020-05-22

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