CN210919152U

CN210919152U - Tunnel heat preservation center ditch structure

Info

Publication number: CN210919152U
Application number: CN201921908280.0U
Authority: CN
Inventors: 吴小策; 孟庆余; 刘海达; 杨昌贤; 曾青; 张弛; 苏哿; 段铮; 李彬
Original assignee: China Railway Design Corp
Current assignee: China Railway Design Corp
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2020-07-03
Anticipated expiration: 2029-11-07

Abstract

The utility model discloses a tunnel heat preservation center ditch structure, which comprises an inverted arch filling, wherein a center drain pipe is arranged in the middle of the inverted arch filling, and the center drain pipe positions the inverted arch filling through a concrete base and a leveling layer; and the central drain pipe and the outer side of the concrete base are provided with heat-insulating layers, and each heat-insulating layer comprises a polyurethane heat-insulating plate and an externally-coated waterproof plate. The utility model relates to an theory is novel, and the heat preservation scheme is reasonable, and the investment is less, the construction of being convenient for, and the problem is frozen to solution cold district tunnel center drain pipe that can be fine, guarantees that the drainage is unblocked in the tunnel, and application prospect is wide.

Description

Tunnel heat preservation center ditch structure

Technical Field

The utility model relates to a tunnel center ditch field specifically is a heat preservation center ditch structure that is used for cold and severe cold area railway tunnel.

Background

With the rapid development of the railway industry in China, in recent years, China has built a plurality of railways in alpine regions. At present, for the tunnel non-deep-buried central ditch section in the cold region, a drainage pipe with a smaller diameter, a half-wrapped heat insulation layer or a mode of paving heat insulation materials on two sides of the central ditch are mostly adopted.

From the railway projects established in the northeast and northwest, the effect of the central ditch half-wrapped and heat-preservation groove type heat-preservation layer is not ideal, and the ice-chiseling treatment is difficult after the ice is frozen. Adopt half package formula heat preservation, the heat preservation effect of side is poor, and adopts and set up insulation material in central ditch both sides, can't avoid producing the clearance again for outside cold air can cause the heat to run off in the central drainage pipe through the infiltration of gap department between insulation material and the concrete, easily appears frosting phenomenon of freezing, and then influences drainage system's in the tunnel unobstructed nature, brings very big potential safety hazard for railway operation.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the not good problem of heat preservation effect among the above-mentioned prior art, and provide a tunnel heat preservation center ditch structure.

The utility model discloses a realize according to following technical scheme:

a tunnel heat preservation center ditch structure comprises an inverted arch filling, wherein a center drain pipe is arranged in the middle of the inverted arch filling, and the center drain pipe is positioned through a concrete base and a leveling layer; and the central drain pipe and the outer side of the concrete base are provided with heat-insulating layers, and each heat-insulating layer comprises a polyurethane heat-insulating plate and an externally-coated waterproof plate.

Furthermore, the central drain pipe is a reinforced concrete prefabricated drain pipe with the inner diameter of 600mm and the wall thickness of 60 mm.

Furthermore, the top of the concrete base is inwards sunken to form an arc groove for placing the central drain pipe, and the arc surface of the arc groove is closely attached to the bottom surface of the central drain pipe.

Further, the concrete base adopts inverted arch to fill concrete of the same grade.

Further, the polyurethane heat-insulating plate on the outer side of the upper half part of the central drain pipe is customized according to the size of the central drain pipe.

Furthermore, polyurethane insulation boards with the thickness of 10cm are selected on the outer sides of the central drain pipe and the concrete base.

The utility model has the advantages and beneficial effects that:

the utility model discloses a tunnel heat preservation center ditch structure, heat preservation adopt the mill prefabricated, reduce the seam, can effectively completely cut off external cold air to reduce center ditch and external heat exchange, make the center ditch possess the heat preservation function. The utility model relates to an theory is novel, and the heat preservation scheme is reasonable, and the investment is less, the construction of being convenient for, and the problem is frozen to solution cold district tunnel center drain pipe that can be fine, guarantees that the drainage is unblocked in the tunnel, and application prospect is wide.

Drawings

Fig. 1 is a cross-sectional view of the present invention;

fig. 2 is a schematic structural view of the heat-insulating layer of the present invention.

Wherein, 1, a central drain pipe; 2, a concrete base;

3. leveling layer; 4. a polyurethane insulation board;

5. a waterproof sheet; filling an inverted arch;

7. and a transverse drain pipe.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples. The following examples are given for the purpose of illustration only and are not intended to be limiting.

A tunnel heat preservation center ditch structure comprises an inverted arch filling 6, wherein a center drain pipe 1 is arranged in the middle of the inverted arch filling 6, collects water seeping in a tunnel and is longitudinally led to the outside of the tunnel along a line to be discharged; the central drain pipe 1 is positioned through the concrete base 2 and the leveling layer 3; the prefabricated heat preservation layer is arranged on the outer sides of the central drain pipe 1 and the concrete base 2, the heat preservation layer comprises a polyurethane heat preservation plate 4 and an externally coated waterproof plate 5, and heat preservation performance of tunnel drainage facilities in severe cold areas is improved.

The central drain pipe 1 is positioned in the inverted arch filling 6, the outer side of the central drain pipe is tightly backfilled by concrete, and heat exchange between the central drain pipe 1 and the external environment is reduced.

The central drain pipe 1 is a reinforced concrete prefabricated drain pipe with the inner diameter of 600mm and the wall thickness of 60 mm. The drain pipe is in accordance with the requirements of the national standard 'concrete and reinforced concrete drain pipe' (GB/T11836-2009) three-grade pipe. The large-diameter drain pipe is convenient for later maintenance.

The top of the concrete base 2 is inwards sunken to form an arc groove for the central drain pipe 1 to be placed, and the arc surface of the arc groove is closely attached to the bottom surface of the central drain pipe 1.

The concrete base 2 is prefabricated by filling 6 same-level concrete with inverted arches, is produced in a factory and assembled on site, and has the radius r of the arc surface₁=360mm, the length of the segments can be determined according to the actual situation in the field.

The utility model discloses a concrete leveling layer 3 controls the elevation of

concrete base

2, and 3 top surfaces of leveling layer will level to guarantee that concrete base 2 is stable.

The polyurethane insulation board 4 outside the upper half part of the central drain pipe 1 is customized according to the size of the central drain pipe 1, so that seams are reduced, and on-site splicing construction is facilitated. Preferably, the arc-shaped polyurethane insulation board 4 outside the upper half part of the central drain pipe 1 is customized to the radius r₂The arc of =360mm makes the heat preservation layer closely stick to central drain pipe 1 and concrete foundation 2, furthest's assurance heat preservation effect.

And the polyurethane heat-insulating plate 4 with the thickness of 10cm is selected at the outer sides of the central drain pipe 1 and the concrete base 2.

The upper side and the lower side of a polyurethane insulation board 4 with the thickness of 10cm are tightly wrapped by waterproof boards 5, so that the polyurethane insulation board 4 is prevented from being soaked in water and losing efficacy, and the insulation effect is prevented from being influenced. When the heat-insulating layer is laid, the heat-insulating layer is closely attached to the outer wall of the central drain pipe 1 or the concrete base 2, so that a good heat-insulating effect is achieved.

The utility model discloses a tunnel heat preservation center ditch structure, which collects the water seepage in the tunnel by arranging a center drain pipe 1 in the middle of an inverted arch filling 6 and leads the water to the outside of the tunnel longitudinally along the line for discharging; the central drain pipe 1 is positioned through the leveling layer 3 and the concrete base 2; through set up prefabricated arc polyurethane insulation board 4 in central drain pipe 1 and concrete foundation 2 outsides, form the heat preservation, can effectively isolated external cold air to reduce central ditch and external heat exchange, make central ditch possess the heat preservation function, reduced the tunnel central drain pipe during the operation and taken place the possibility of freeze injury, guarantee tunnel operation safety.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, improvements, etc. made on the basis of the present invention should be included within the scope of the present invention.

Claims

1. The tunnel heat-preservation central ditch structure is characterized by comprising an inverted arch filler (6), wherein a central drain pipe (1) is arranged in the middle of the inverted arch filler (6), and the central drain pipe (1) is positioned through a concrete base (2) and a leveling layer (3); the central drain pipe (1) and the outer side of the concrete base (2) are provided with heat-insulating layers, and each heat-insulating layer comprises a polyurethane heat-insulating plate (4) and an externally-coated waterproof plate (5).

2. A tunnel insulation central raceway structure according to claim 1, characterized in that the central drain pipe (1) is a prefabricated reinforced concrete drain pipe with an inner diameter of 600mm and a wall thickness of 60 mm.

3. A tunnel heat preservation central ditch structure according to claim 1, characterized in that the top of the concrete base (2) is sunken inwards to form an arc groove for the central drain pipe (1) to be placed, and the arc surface of the arc groove is closely attached to the bottom surface of the central drain pipe (1).

4. A tunnel insulation central raceway arrangement according to claim 1, characterized in that the concrete foundation (2) is of inverted arch filled (6) grade concrete.

5. A tunnel insulation central raceway structure according to claim 1, characterized in that the polyurethane insulation board (4) outside the upper half of the central drain pipe (1) is customized according to the size of the central drain pipe (1).

6. The tunnel heat preservation central ditch structure of claim 1, characterized in that the central drain pipe (1) and the outer side of the concrete base (2) are polyurethane heat preservation plates (4) with the thickness of 10 cm.