CN204572060U - A kind of tunnel in cold area circle draining system - Google Patents

Abstract

The utility model discloses an annular drainage system for tunnels in cold regions. The annular drainage pipe is fixedly connected to the outer wall of the primary support through U-shaped clips and nails; The belt and rock wool insulation felt, the longitudinal drainage pipe is located at the bottom of the primary support, and the lower end of the capillary permeable drainage belt is connected to the longitudinal drainage pipe; the outer side of the rock wool insulation felt is laid with geotextiles and waterproof boards in sequence, geotextiles, waterproof boards They are all fixedly connected to the outer wall of the primary support through expansion tube screws, and there is a secondary lining on the outer side of the waterproof board; the waterproof board is completely covered with geotextile, and the geotextile is completely covered with capillary permeable drainage belt and rock wool insulation felt; ring The lower end of the drainage pipe is connected with the horizontal drainage pipe, the horizontal drainage pipe is connected with the central drainage ditch, and the outside of the horizontal drainage pipe is wrapped with rock wool insulation felt. The utility model achieves the effect of unobstructed drainage of the circular drainage pipe and the central drainage ditch at the back of the tunnel lining in the cold region.

Description

A circular drainage system for tunnels in cold regions

technical field

The utility model relates to the field of tunnels and underground engineering, in particular to a ring drainage system for tunnels in cold regions.

Background technique

With the continuous development of my country's traffic construction, the weather, hydrology, geology and geomorphology, and surrounding rock types faced by expressway tunnels have become more and more complex. Water leakage has become one of the most important problems faced by highway tunnels. In tunnels in cold regions, the circumferential drainage pipes behind the lining are prone to freezing, blockage, heaving, and cracking, resulting in poor drainage of the tunnel. Hanging icicles, ice hanging on side walls, frost heaving and cracking of lining and other diseases seriously threaten driving safety.

The existing antifreeze and heat preservation measures for the circumferential drainage pipes of tunnels in cold regions mainly include setting an insulation layer on the lining surface or behind the lining wall, but the antifreeze and heat preservation effect is not ideal in practical applications. In order to deal with these problems, research on thermal insulation measures for tunnel circumferential drainage pipes has been carried out. For example, Chinese patent (patent application No. 200820228375.3) discloses a tunnel hoop drainpipe that is provided with a strip insulation layer, which includes a hoop drainage pipe behind the lining wall, strip insulation layer, waterproof board, etc. Although this patent It solves the problem of partial thermal insulation of the circumferential drainage pipes of tunnels in cold regions, but when the water seepage behind the lining is small and in a slow seepage state, the seepage water stays behind the lining for a long time, which can easily cause the waterproof performance of the circumferential drainage pipes and waterproof boards to decline ; As for the central drainage ditch, when the setting depth is less than the maximum freezing depth, the central drainage ditch is prone to freezing, which will affect the drainage effect.

Therefore, in view of the problems existing in the prior art, it is particularly important to urgently provide a tunnel circumferential drainage system in cold regions.

Utility model content

Aiming at the deficiencies of the existing technology, the purpose of this utility model is to provide a circular drainage system for tunnels in cold regions. , The effect of unobstructed drainage in the central drainage ditch.

The purpose of this utility model is achieved through the following technical solutions:

A circumferential drainage system for tunnels in cold regions, including primary support, circumferential drainage pipes, longitudinal drainage pipes, horizontal drainage pipes, central drainage ditch and secondary lining: the circumferential drainage pipes are fixed by U-shaped clips and nails Connected to the outer wall of the initial support; on the outer side of the circumferential drainage pipe, a capillary permeable drainage belt and rock wool insulation felt are laid in sequence, the longitudinal drainage pipe is located at the bottom of the initial support, and the lower end of the capillary permeable drainage belt It is connected with the longitudinal drainage pipe; the outer side of the rock wool insulation felt is laid with geotextiles and waterproof boards in sequence, and the geotextiles and waterproof boards are fixedly connected to the outer wall of the primary support through expansion tube screws. The outer side is provided with secondary lining; the waterproof board is completely covered with geotextile, and the geotextile is completely covered with capillary permeable drainage belt and rock wool insulation felt; the lower end of the circular drainage pipe is connected with the horizontal drainage pipe, and the horizontal drainage pipe It communicates with the central drainage ditch, and the outer side of the lateral drainage pipe is wrapped with rock wool insulation felt.

In order to better realize the utility model, the upper part of the central drainage ditch is backfilled with lightweight aggregate heat-preservation concrete.

A further technical solution is: the U-shaped clip surrounds the circumferential drainage pipe, the two ends of the U-shaped clip are installed with the shooting nails, and the shooting nails at both ends of the U-shaped clip are fixedly connected to the initial support.

The arrangement structure of the expansion tube screw of the utility model is as follows: one end of the expansion tube screw is fixedly inserted into the interior of the primary support, and the other end of the expansion tube screw is provided with a plastic gasket, and the plastic gasket is placed on the second Secondary lining inside.

The technical scheme of the preferred capillary permeable drainage belt structure of the utility model is as follows: the capillary permeable drainage belt is composed of capillary pores and grooves connected with the capillary pores, the internal aperture of the capillary pores is larger than the external aperture, and the width of the water inlet of the groove is 0.3mm.

The technical scheme of the preferred rock wool thermal insulation felt of the utility model is as follows: the thickness of the rock wool thermal insulation felt is 5 cm, and the thermal conductivity is 0.025-0.035 W/m·K.

The preferred technical scheme of the expansion tube screw of the utility model is as follows: the diameter of the expansion tube screw is 10 mm, and the distance between two adjacent expansion tube screws is 20 cm.

The preferred technical scheme of the lightweight aggregate thermal insulation concrete of the present invention is as follows: the bulk density of the lightweight aggregate thermal insulation concrete is not greater than 800kg/m ³ , and the thermal conductivity of the lightweight aggregate thermal insulation concrete is 0.048W/m·K.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

The construction steps of the utility model are simple, the required cost is low, and the operability is strong, which can effectively prevent the retention of a small amount of leaking water behind the tunnel lining, avoid freezing blockage, frost heaving, and frost cracking of the circular drainage pipe; Aggregate thermal insulation concrete and lateral drainage pipes are wrapped with rock wool thermal insulation felt, which can effectively prevent the groundwater in the central drainage ditch from freezing and ensure smooth drainage. At the same time, it can reduce the upper load of the central drainage ditch and ensure its long-term use performance. High economic and social benefits.

Description of drawings

Fig. 1 is the partial structural representation of the utility model;

Fig. 2 is A-A sectional view among Fig. 1;

Fig. 3 is a schematic diagram of the structure of the capillary permeable drainage zone;

FIG. 4 is a schematic structural diagram of the expansion tube screw of this embodiment.

Wherein, the names corresponding to the reference signs in the accompanying drawings are:

1-initial support, 2-circular drainage pipe, 3-U-shaped card, 4-nailing, 5-capillary permeable drainage belt, 6-rock wool insulation felt, 7-geotextile, 8-waterproof board, 9- Expansion screw, 10-plastic gasket, 11-secondary lining, 12-capillary hole, 13-groove, 14-longitudinal drainage pipe, 15-horizontal drainage pipe, 16-central drainage ditch, 17-light aggregate insulation concrete.

Detailed ways

Below in conjunction with embodiment the utility model is described in further detail:

Example

As shown in Figures 1 to 3, a circular drainage system for tunnels in cold regions includes primary support 1, circumferential drainage pipe 2, longitudinal drainage pipe 14, horizontal drainage pipe 15, central drainage ditch 16 and secondary lining 11 The circumferential drainage pipe 2 is fixedly connected to the outer wall of the initial support 1 through the U-shaped clip 3 and the nail 4; the capillary permeable drainage belt 5 and the rock wool insulation felt are sequentially laid on the outer side of the circumferential drainage pipe 2 6. The longitudinal drainage pipe 14 is located at the bottom of the primary support 1, and the lower end of the capillary permeable drainage belt 5 is connected to the longitudinal drainage pipe 14; the outer side of the rock wool insulation felt 6 is laid with a geotextile 7 and waterproof board 8, the geotextile 7 and the waterproof board 8 are all fixedly connected to the outer wall of the primary support 1 through the expansion tube screw 9, and a secondary lining 11 is arranged on the outer side of the waterproof board 8; the waterproof board 8 is completely covered The geotextile 7, the geotextile 7 completely covers the capillary permeable drainage belt 5 and the rock wool insulation felt 6; the lower end of the circumferential drainage pipe 2 is connected to the horizontal drainage pipe 15, and the horizontal drainage pipe 15 is connected to the central drainage ditch 16 Connected to each other, the outside of the lateral drainage pipe 15 is wrapped with rock wool insulation felt 6 .

As shown in Figure 1, the upper part of the central drainage ditch 16 is backfilled with lightweight aggregate thermal insulation concrete 17, which can reduce the upper load of the central drainage ditch 16 and ensure its long-term performance.

According to one embodiment of the present invention, as shown in Figure 2, the U-shaped card 3 surrounds and wraps the circumferential drain pipe 2, and the two ends of the U-shaped card 3 are equipped with the nails 4, and the two ends of the U-shaped card 3 The nail 4 at the end is fixedly connected to the primary support 1.

According to an embodiment of the present utility model, as shown in Figure 2, one end of the expansion tube screw 9 is fixedly inserted into the interior of the primary support 1, and the other end of the expansion tube screw 9 is provided with a plastic gasket 10, the The plastic gasket 10 is placed inside the secondary lining 11 .

According to an embodiment of the present utility model, as shown in Figure 3, the capillary permeable drainage belt 5 is composed of a capillary hole 12 and a groove 13 connected with the capillary hole 12, the internal aperture of the capillary hole 12 is larger than the external aperture, and the groove 13 The water inlet width is 0.3mm.

According to an embodiment of the present invention, the rock wool insulation felt 6 has a thickness of 5 cm and a thermal conductivity of 0.025-0.035 W/m·K.

According to an embodiment of the present invention, the diameter of the expansion tube screw 9 is 10 mm, and the distance between two adjacent expansion tube screws 9 is 20 cm.

According to an embodiment of the present invention, the bulk density of the lightweight aggregate thermal insulation concrete 17 is not greater than 800kg/m ³ , and the thermal conductivity of the lightweight aggregate thermal insulation concrete 17 is 0.048W/m·K.

The utility model also provides the installation method of the ring drainage system of the tunnel in the cold area, which includes the following steps:

1. Install the circumferential drainage pipe 2, and fix it on the initial support 1 with U-shaped clamps 3, and the circumferential spacing of the U-shaped clamps 3 is 20cm.

2. Lay capillary permeable drainage belt 5 and rock wool insulation felt 6, both of which have a width of 50 cm, and the lower end of capillary permeable drainage belt 5 is connected to longitudinal drainage pipe 14.

3. Lay geotextile 7 and waterproof board 8 on the outer side of rock wool insulation felt 6, and use expansion tube screw 9 and plastic gasket 10 on both sides to fix them respectively, and the circumferential distance is 20cm.

4. Wrap the horizontal drainage pipe 15 with rock wool insulation felt 6, the thickness of which is not less than 5cm.

5. Backfill lightweight aggregate heat-preservation concrete 17 in the wedge-shaped body above the center drainage ditch 16 .

Compared with the prior art, the construction steps of the utility model are simple, the required cost is low, and the operability is strong. It can effectively prevent a small amount of leakage water retention behind the tunnel lining, and avoid freezing blockage, frost heave, and Freezing and cracking; and by backfilling lightweight aggregate thermal insulation concrete, it can effectively prevent the groundwater in the central drainage ditch from freezing, ensure smooth drainage, reduce the upper load of the central drainage ditch, ensure its long-term use performance, and have high economic efficiency. benefits and social benefits.

The above-mentioned implementation mode is only a preferred embodiment of the utility model, and is not used to limit the implementation and scope of rights of the utility model. All equivalent changes and approximate replacements made according to the content described in the patent protection scope of the utility model , all should fall within the protection scope of the present utility model.

Claims (8)

1. a tunnel in cold area circle draining system, comprise preliminary bracing (1), ring direction drainpipe (2), longitudinal drainage pipe (14), transverse drain (15), central row ditch (16) and secondary lining (11), it is characterized in that: described ring direction drainpipe (2) is fixedly connected on the lateral wall of preliminary bracing (1) by U-shaped card (3), nailing (4); Capillary penetrating drainage band (5) and rock wool heat-preservation felt (6) is laid with successively in the outside of ring direction drainpipe (2), described longitudinal drainage pipe (14) is positioned at the bottom of preliminary bracing (1), and the lower end of described capillary penetrating drainage band (5) is connected with longitudinal drainage pipe (14); The outside of described rock wool heat-preservation felt (6) is laid with geotextiles (7) and splash guard (8) successively, described geotextiles (7), splash guard (8) are all fixedly connected on preliminary bracing (1) lateral wall by expanding tube screw (9), are provided with secondary lining (11) in the outside of splash guard (8); The complete coated geotextiles (7) of described splash guard (8), the complete coated capillary penetrating drainage band (5) of geotextiles (7), rock wool heat-preservation felt (6); The lower end of described ring direction drainpipe (2) is connected with transverse drain (15), and transverse drain (15) is connected with described central row ditch (16), and the outer wrap of described transverse drain (15) has rock wool heat-preservation felt (6).

2. according to a kind of tunnel in cold area circle draining system according to claim 1, it is characterized in that: the top backfill of described central row ditch (16) is provided with lightweight aggregate thermal insulation concrete (17).

3. according to a kind of tunnel in cold area circle draining system according to claim 1, it is characterized in that: described U-shaped card (3) is around wrapping ring direction drainpipe (2), described nailing (4) is all installed in the end, two ends of U-shaped card (3), and the nailing (4) at U-shaped card (3) two ends is fixedly connected in preliminary bracing (1).

4. according to a kind of tunnel in cold area circle draining system according to claim 1, it is characterized in that: one end end winding support of described expanding tube screw (9) inserts in preliminary bracing (1) inside, the other end end of expanding tube screw (9) is provided with plastic spacer (10), and it is inner that described plastic spacer (10) is placed in secondary lining (11).

5. according to a kind of tunnel in cold area circle draining system according to claim 1, it is characterized in that: described capillary penetrating drainage band (5) is made up of pore (12) and the groove (13) that is connected with pore (12), the aperture, inside of pore (12) is greater than outside aperture, and the water inlet width of groove (13) is 0.3 mm.

6. according to a kind of tunnel in cold area circle draining system according to claim 1, it is characterized in that: the thickness of described rock wool heat-preservation felt (6) is 5 cm, and coefficient of thermal conductivity is 0.025 ~ 0.035 W/mK.

7. according to a kind of tunnel in cold area circle draining system described in claim 1 or 4, it is characterized in that: the diameter of described expanding tube screw (9) is 10 mm, the setting space of adjacent two expanding tube screws (9) is 20 cm.

8. according to a kind of tunnel in cold area circle draining system according to claim 2, it is characterized in that: the unit weight of described lightweight aggregate thermal insulation concrete (17) is not more than 800 kg/m ³, the coefficient of thermal conductivity of lightweight aggregate thermal insulation concrete (17) is 0.048 W/mK.