CN212105956U - Passive drainage system of tunnel inverted arch - Google Patents

Abstract

The utility model discloses a passive drainage system of tunnel invert contains the leading water pipe, the leading water pipe is along the vertical interval distribution in tunnel, the leading water pipe contains vertical section and horizontal section, the one end of vertical section stretches into in the country rock of invert below, the other end is connected the one end of horizontal section, the other end of horizontal section communicates the lateral wall in central escape canal, the central escape canal is located the filling layer of invert. The underground water of invert bottom gathering is led in row that this device can be unobstructed reduces the outer water pressure of tunnel bottom lining cutting to effectively solved the problem of invert bottom country rock ponding, guaranteed the long-term operation safety of tunnel invert, the practicality is strong, can effectively reduce the construction degree of difficulty and construction cost, economic benefits is showing.

Description

Passive drainage system of tunnel inverted arch

Technical Field

The utility model relates to a tunnel engineering technical field, in particular to passive drainage system of tunnel invert.

Background

The inverted arch of traditional tunnel design does not set up drainage system usually, if meet groundwater and develop, the inverted arch just can be in the pressure-bearing state at construction and operation in-process. Water pressure is main load, and direct action is on invert department preliminary bracing and secondary lining to lead to invert department often to take place to gush water, disease such as mud pumping, influence tunnel operation safety, and disease renovation often can consume a large amount of manpower and materials, the effect is not showing significantly, causes huge economic loss.

The scheme of the existing inverted arch designed railway tunnel bottom drainage mainly comprises the following steps:

1. and only two sides of the tunnel are provided with lateral ditches. In this scheme, the lateral ditches accept the seepage water that tunnel ring direction blind pipe and vertical blind pipe gathered and arrange to the tunnel outside. However, the drainage speed of the scheme is limited, if the water seepage amount of the tunnel upper structure is large, water may spread into the tunnel, and the accumulated water at the bottom of the inverted arch of the tunnel cannot be drained.

2. The two sides of the tunnel are provided with side ditches, the center of the tunnel is provided with a drain pipe, and the central drain pipe is arranged in the inverted arch filling concrete. This scheme can be discharged tunnel superstructure infiltration smoothly, but tunnel invert bottom ponding can not be drawn the row.

3. The tunnel both sides set up the side ditch, and the tunnel center sets up the drain pipe, and inverted arch structure bottom is arranged in to central drain pipe. This scheme can lead the row smoothly with tunnel invert bottom ponding, but in the better district of country rock level, tunnel bottom center drain pipe foundation trench excavation difficulty has increased the construction degree of difficulty and construction cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome lack the effective drainage scheme to invert bottom ponding among the prior art, threaten the above-mentioned not enough of tunnel operation safety, provide a passive drainage system of tunnel invert.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model provides a passive drainage system of tunnel invert, contains the leading pipe, the leading pipe is along the vertical interval distribution in tunnel, the leading pipe contains vertical section and horizontal section, the one end of vertical section is stretched into in the country rock of invert below, the other end is connected the one end of horizontal section, the other end intercommunication central drainage ditch's of horizontal section lateral wall, central drainage ditch is located the filling layer of invert.

By adopting the passive drainage system of the tunnel inverted arch, the central drainage ditch is arranged on the filling layer of the inverted arch, so as to avoid the excavation in the surrounding rock and effectively reduce the construction difficulty and the construction cost, the water conduit extends into the surrounding rock, when the accumulated water in the surrounding rock is collected at the bottom of the tunnel to generate water pressure, the accumulated water can be discharged into the central drainage ditch through the water conduit, thereby effectively solving the problem of water accumulation of surrounding rocks at the bottom of the inverted arch, the water conduit is communicated with the side wall of the central drainage ditch to form a drainage channel, in order to do benefit to the discharge of ponding in the leading water pipe effectively avoids ponding in the central ditch is against the current, and the groundwater of invert bottom gathering is led in row that this structure can be unobstructed reduces the outer water pressure of tunnel bottom lining cutting, guarantees the long-term operation safety of tunnel invert, and the practicality is strong, and economic benefits is showing.

Preferably, the distance between two adjacent water diversion pipes is 5-10 m.

Preferably, the diameter of the water conduit is 100-120 mm.

Preferably, the depth of the water conduit in the surrounding rock is 30-50 cm.

Preferably, the central drain is communicated with the side drains through a lateral drain pipe provided in the filling layer of the inverted arch.

Further preferably, the lateral ditches are also communicated with longitudinal blind pipes arranged in the side walls of the tunnel.

Through the common cooperation of horizontal drain pipe and vertical blind pipe, effectively solve infiltration, the ponding problem in the tunnel, can also improve drainage efficiency.

Preferably, the horizontal section and the horizontal drain pipe are respectively located at the same height with the central drain pipe.

Is convenient for construction and installation.

Preferably, the water guide pipes are arranged on two sides of the central drainage ditch and arranged in a staggered mode.

Preferably, the water conduit is a PVC pipe.

To sum up, compare with prior art, the beneficial effects of the utility model are that:

1. adopt a passive drainage system of tunnel invert, can effectively reduce the construction degree of difficulty and construction cost, the leading pipe stretches into in the country rock, work as ponding in the country rock collects at the bottom of the tunnel and when producing water pressure, the accessible the leading pipe discharge extremely in the central escape canal to effectively solved the problem of invert bottom country rock ponding, the leading pipe is followed central escape canal lateral wall intercommunication forms drainage channel, so as to do benefit to the discharge of ponding in the leading pipe effectively avoids ponding in the central ditch is against the current, and the groundwater of gathering of invert bottom is led in row that this structure can be unobstructed, reduces the outer water pressure of tunnel bottom lining cutting, guarantees the long-term operation safety of tunnel invert, and the practicality is strong, and economic benefits is showing.

Description of the drawings:

fig. 1 is a schematic structural view of a passive drainage system of an inverted arch of a tunnel according to embodiment 1.

The labels in the figure are: 11-vertical section, 12-horizontal section, 2-surrounding rock, 3-central drainage ditch, 4-horizontal drainage pipe, 5-side ditch and 6-longitudinal blind pipe.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter is limited to the following embodiments, and all the technologies realized based on the present invention are within the scope of the present invention.

Example 1

As shown in fig. 1, the passive drainage system of tunnel invert of the present invention comprises a water conduit, wherein the water conduit is a PVC conduit, if the diameter of the water conduit is 100-120mm, the water conduit is longitudinally spaced along the tunnel, if two adjacent water conduits are spaced at an interval of 5-10 m.

The leading water pipe contains vertical section 11 and horizontal section 12, the vertical setting of vertical section 11, horizontal section 12 is along the horizontal setting in tunnel, vertical section 11 one end is stretched into in the country rock 2 of invert below, the other end is connected horizontal section 12's one end, if the leading water pipe is in buried depth 30-50cm in the country rock 2 to effective drainage, and the trompil degree of difficulty is not high with the expense, horizontal section 12's the other end intercommunication central escape canal 3's lateral wall, central escape canal 3 locates the filling layer of invert, preferably, if the both sides of central escape canal 3 all are equipped with leading water pipe, both sides leading water pipe dislocation set.

The two side walls of the central drainage ditch 3 are also respectively connected with a transverse drainage pipe 4, the other end of the transverse drainage pipe 4 is connected with a side ditch 5, a longitudinal blind pipe 6 is further arranged in the side wall of the tunnel, and the end part of the longitudinal blind pipe 6 is directly bent into the side ditch 5. In fig. 1, the elevation of the side ditch 5 is higher than the elevation of the central drainage ditch 3, and the accumulated water in the side ditch 5 can also pass through the central drainage ditch 3 and is discharged outside the tunnel.

This structure can be unobstructed arrange the groundwater of leading invert bottom gathering, reduces the outer water pressure of tunnel bottom lining cutting to effectively solved the problem of invert bottom country rock ponding, guaranteed the long-term operation safety of tunnel invert, the practicality is strong, can effectively reduce the construction degree of difficulty and construction cost, economic benefits is showing.

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 (9)

1. The utility model provides a passive drainage system of tunnel invert, its characterized in that contains the leading pipe, the leading pipe is along the vertical interval distribution in tunnel, the leading pipe contains vertical section (11) and horizontal section (12), the one end of vertical section (11) stretches into in country rock (2) of invert below, the other end is connected the one end of horizontal section (12), the other end intercommunication center escape canal's of horizontal section (12) lateral wall of escape canal (3), center escape canal (3) are located the filling layer of invert.

2. The drainage system of claim 1, wherein the distance between two adjacent water conduits is 5-10 m.

3. The drainage system as claimed in claim 1, wherein the diameter of the water conduit is 100-120 mm.

4. A drainage system according to claim 1, wherein the penstock is buried 30-50cm deep in the surrounding rock (2).

5. A drainage system according to claim 1, wherein the central drain (3) communicates with the side drains (5) via lateral drainage pipes (4) provided in the filling level of the inverted arch.

6. A drainage system according to claim 5, wherein the lateral ditches (5) are also in communication with longitudinal blind pipes (6) provided in the side walls of the tunnel.

7. A drainage system according to claim 5, wherein the connection of the lateral section (12) and the lateral drainage pipe (4) to the central drainage ditch (3), respectively, is at the same height.

8. A drainage system according to any one of claims 1 to 7, wherein the water conduits are arranged on both sides of the central drainage ditch (3) and are arranged in a staggered manner.

9. The drainage system of any one of claims 1 to 7, wherein the penstock is a PVC pipe.

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