CN210977523U

CN210977523U - Spraying type water-proof and drainage structure for expressway tunnel

Info

Publication number: CN210977523U
Application number: CN201922068269.4U
Authority: CN
Inventors: 潘晓东
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-12-10
Filing date: 2019-11-26
Publication date: 2020-07-10
Anticipated expiration: 2029-11-26

Abstract

The utility model belongs to the technical field of civil engineering, in particular to highway tunnel spraying type waterproof and drainage structure. The utility model provides a highway tunnel spraying formula waterproof and drainage structure with new construction, this highway tunnel spraying formula waterproof and drainage structure is through setting up the drainage blanket, the drainage blanket is short-staple spongy foam permeable bed, can make full use of foam material's capillary force, siphon power and surface tension, when guaranteeing highway tunnel supporting stress continuity, form independent capillary drainage system that passes through, when saving time limit for a project progress, increased the laminating intensity of country rock face and two lining concretes, reinforcing highway tunnel in the face of country rock pressure and the stability and the security of proruption geological activity calamity; by arranging the waterproof layer, the surrounding rock surface of the highway tunnel and the two lining concretes are completely and compactly attached to form a common deformation stress body, and the waterproof and drainage functions and the structural safety of the highway tunnel are ensured.

Description

Spraying type water-proof and drainage structure for expressway tunnel

Technical Field

The utility model belongs to the technical field of civil engineering, in particular to highway tunnel spraying type waterproof and drainage structure.

Background

In order to ensure the operation safety of the highway tunnel, the highway tunnel in China needs to be designed for water prevention and drainage except dry areas, and the design principle is that technical methods such as blocking, dredging, drainage and the like are adopted according to the dry and wet type of the tunnel, the grade of surrounding rocks of the tunnel, the water permeability of cracks of the surrounding rocks and the like in combination with the current situation of excavation. In the northern semi-dry and wet area, due to the low temperature in winter, although the crack water in most tunnels is not developed seriously, if the water-proof and drainage facilities are not made seriously, the diseases such as water leakage, frost heaving and the like are easy to occur.

At present, most of expressway tunnels mainly adopt a plastic drainage plate method, as shown in figure 1, namely before casting of secondary lining concrete, plastic drainage plates 2 (or drainage geotextiles and plastic plates) are directly hung on an excavated tunnel surrounding rock surface 1 or a tunnel surrounding rock surface 1 after primary spraying and secondary spraying, then secondary lining concrete reinforcing steel bars are installed and bound, a template trolley is installed in place, end anchors are sealed, and secondary lining concrete 3 is cast layer by layer from bottom to top.

The construction method is theoretically not problematic, however, the construction control and the final result in the actual engineering are difficult to meet the design requirements, one is that the whole tunnel surrounding rock surface 1 is not smooth and flat, and particularly, for an override cross section, whether the tunnel surrounding rock surface is leveled by spraying concrete or not is difficult to reach an ideal state; secondly, as the rigidity of the plastic drainage plate 2 is locally higher, the seamless joint of the plastic drainage plate 2 and the tunnel surrounding rock surface 1 cannot be achieved; thirdly, even if the plastic drainage plate 2 is loose when hung according to the design requirement, after the second lining concrete 3 starts to be poured, along with the continuous rising of the pouring position, the plastic drainage plate 2 is tightened and lagged downwards, and the hanging point on the tunnel surrounding rock surface 1 starts to fall off, so that the plastic drainage plate 2 around the top and two sides is downwards attached to the second lining reinforcing steel bar or attached to the top template of the template trolley, therefore, when the second lining concrete 3 around the top is poured, the tunnel surrounding rock surface 1 and the second lining concrete 3 artificially form a hollow interlayer 4, the reinforcing steel bar on the upper layer of the second lining concrete 3 can not be completely wrapped by the concrete, and the thickness of the second lining concrete 3 on the top can not reach the design requirement.

The problem causes that the two-lining concrete can not form an integral stress with the surrounding rock of the tunnel, the safe storage of the tunnel is influenced, and the cavity formed between the drainage plate and the surrounding rock of the tunnel is easy to have frost heaving phenomenon after water is accumulated in winter, so that the two-lining concrete cracks and leaks water, and the tunnel structure of the highway is damaged.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the utility model provides a novel spraying type waterproof and drainage structure for a highway tunnel.

The utility model discloses specific technical scheme as follows:

the utility model provides a highway tunnel spraying formula waterproof and drainage structure, including coat in the drainage blanket on the tunnel country rock face and coat in waterproof layer on the drainage blanket, the drainage blanket is short-staple spongy foam permeable bed, just the drainage blanket with the waterproof layer is located between tunnel country rock face and the two lining concretes, a side of waterproof layer is located on the drainage blanket, another side contacts with two lining concretes.

In a further improvement, the thickness of the drainage layer is 3mm-7 mm.

In a further improvement, the drainage layer is made of a composite drainage material.

In a further refinement, the drainage layer includes capillary gaps.

In a further improvement, the waterproof layer is a water sealing film with the thickness of 0.5mm-5 mm.

In a further improvement, the waterproof layer is made of a composite waterproof material.

The utility model has the advantages as follows:

the utility model provides a highway tunnel spraying formula waterproof and drainage structure with new construction, this highway tunnel spraying formula waterproof and drainage structure is through setting up the drainage blanket, the drainage blanket is short-staple spongy foam permeable bed, can make full use of foam material's capillary force, siphon power and surface tension, when guaranteeing highway tunnel supporting stress continuity, form independent capillary drainage system that passes through, when saving time limit for a project progress, increased the laminating intensity of country rock face and two lining concretes, reinforcing highway tunnel in the face of country rock pressure and the stability and the security of proruption geological activity calamity; through setting up the waterproof layer, form a simple and practical, convenient and fast, perfect drainage, waterproof system, not only make the complete closely knit laminating of highway tunnel country rock face and two lining concretes form common deformation stress body, ensured the waterproof function and the structural safety in highway tunnel moreover, improved the quality and the safe deposit in highway tunnel.

Drawings

Fig. 1 is a schematic structural diagram of a water-proof and drainage structure of a highway tunnel in the prior art according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a spraying type waterproof and drainage structure for a highway tunnel according to an embodiment of the present invention;

fig. 3 is a schematic view of a drainage layer structure of a spray type waterproof and drainage structure for a highway tunnel according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings.

The embodiment 1 of the utility model provides a highway tunnel spraying type waterproof and drainage structure, as shown in fig. 1, including coat in drainage blanket 5 on tunnel country rock face and coat in waterproof layer 6 on drainage blanket 5, drainage blanket 5 is short-staple spongy foam permeable bed, just drainage blanket with the waterproof layer is located between tunnel country rock face and the two lining concretes, a side of waterproof layer 6 is located on drainage blanket 5, another side contacts with two lining concretes.

The thickness of the drainage layer 5 in this embodiment is 3mm to 7 mm.

In this embodiment, the drainage layer 5 is made of a composite drainage material. Specifically, the drainage material is a composite short fiber spongy foam drainage material, and the drainage layer is a short fiber spongy foam permeable layer with the thickness of 3mm-7mm formed by spraying the composite drainage material on the surrounding rock surface of the tunnel in cooperation with an adhesive material.

In this embodiment, the waterproof layer 6 is a water sealing film with a thickness of 0.5mm to 5 mm.

In this embodiment, the waterproof layer 6 is made of a composite waterproof material. Specifically, the composite waterproof material is a composite waterproof material mainly based on cement-based infiltration crystallization; the waterproof layer is a water sealing film which is formed by spraying a composite waterproof material on the surface of the drainage layer and performing cold curing and has the thickness of 0.5-5 mm.

The drainage layer 5 in this embodiment includes capillary gaps 51. The drainage layer adopts a composite short-fiber spongy foam drainage material, and fully utilizes the capillary force, siphon force and surface tension of the foam material, so that an independent capillary permeable drainage system is formed while the continuity of the supporting stress of the highway tunnel is ensured. The water in the cracks of the tunnel surrounding rock surface 1 flows through the capillary gaps 51 formed by the drainage layer 5 and is intensively drained. The drainage system material has the effects of drainage, foaming, bonding and filling at one time. While saving the progress of the construction period, the joint strength of the surrounding rock surface and the second lining concrete is increased, and the stability and the safety of the tunnel facing the surrounding rock pressure and the sudden geological activity disasters are enhanced

The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

Claims

1. The utility model provides a highway tunnel spraying formula waterproof and drainage structure, its characterized in that, including coat in drainage blanket (5) on the tunnel encloses the rock face and coat in waterproof layer (6) on drainage blanket (5), drainage blanket (5) are short-staple spongy foam permeable bed, just drainage blanket with the waterproof layer is located between tunnel encloses rock face and the two lining concretes, a side of waterproof layer (6) is located on drainage blanket (5), another side contacts with two lining concretes.

2. The spray waterproof and drainage construction for highway tunnels according to claim 1, wherein the thickness of the drainage layer (5) is 3mm to 7 mm.

3. The spray waterproof and drainage structure for the highway tunnel according to claim 1, wherein the drainage layer (5) is made of a composite drainage material.

4. The spray waterproof and drainage construction for highway tunnels according to claim 1, wherein said drainage layer (5) comprises capillary gaps (51).

5. The spray waterproof and drainage construction for highway tunnels according to claim 1, wherein the waterproof layer (6) is a water-sealing film with a thickness of 0.5mm to 5 mm.

6. The spraying type waterproof and drainage structure for the expressway tunnel according to claim 1, wherein the waterproof layer (6) is made of a composite waterproof material.