CN104612721A

CN104612721A - Deep buried central gutterway inspection well structure for cold region tunnel

Info

Publication number: CN104612721A
Application number: CN201510001707.9A
Authority: CN
Inventors: 孙克国; 仇文革; 许炜萍; 徐雨平
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2015-01-04
Filing date: 2015-01-04
Publication date: 2015-05-13
Anticipated expiration: 2035-01-04
Also published as: CN104612721B

Abstract

The invention discloses a deep buried central gutterway inspection well structure for a cold region tunnel. The structure starts from a heat transfer fundamental form, adopts two layer cover plates (100, 200) and corresponding air impermeable sealing mechanisms (110, 210), and fully utilizes a confined space between the cover plates, so that the conduction effect is effectively lowered, and the convection effect is forcefully prevented. An enclosure space (300) between the two layer cover plates also has the heat insulation and preservation effect. According to the structure, the heat transfer from an inspection well to the tunnel is effectively prevented, the occurrence of the problem of the tunnel waterproof and drainage system failure caused by a frozen inspection well is prevented, and the cold region tunnel frost damage problem caused by the frozen inspection well is solved. Compared with an existing structure of the inspection well, the control on the heat convection of the deep buried central gutterway inspection well of the cold region tunnel is achieved, the fast heat conduction in a convection mode is prevented, and an example is provided for a waterproof and drainage design of the cold region tunnel.

Description

A kind of buried Central drain manhole of tunnel in cold area that is used for constructs

Technical field

The present invention relates to underground engineering field, be specially adapted to the freezing prevention problem of the buried Central drain manhole of tunnel in cold area.

Background technology

The district that trembles with fear of China is widely distributed, and trip demand is vigorous therebetween, and construction of tunnel obtains carrying out on a large scale applying in cold district traffic engineering as the effective means of crossing over mountain after mountain.Freezing damage in tunnel happens occasionally, wherein especially remarkable with the lost efficacy freezing damage in tunnel that causes of waterproof and water drainage system, brings extreme difficulties to tunnel safety operation.The principal element causing tunnel waterproof and water drainage system to lose efficacy is buried Central drain manhole structure, so how to ensure the heat insulation effect of manhole, becomes the important content solving tunnel in cold area freeze injury.

For the Insulation of manhole, generally adopt the mode of one deck or two-layer cover plate, the effect of heat insulation but it covets, payes attention to not sealing.Once the sealing effectiveness of manhole is bad, cold air in tunnel and the air in manhole complete exchange heat by the mode of convection current, heat transmission speed under which is the several times of heat exchange pattern, thus make the heat insulation work failure of manhole, cause the inefficacy of waterproof and water drainage system and the generation of freezing damage in tunnel.So must start with from the citation form of heat conduction (conduction, convection current, radiation), the insulation problem of manhole thoroughly can be solved.Heat radiation in tunnel transmits form relative to other two kinds of heats, and quantity is few, can ignore, so need to consider conduction and convection two kinds of modes.But current manhole sealing structure is not good, leaves air convection channel, is unfavorable for insulation, in order to overcome this problem, must tries every possible means from heat conduction basic mode, break through to obtain essence.

Summary of the invention

In view of the deficiency of existing manhole structure, the object of the invention is to propose a kind of novel heat preservation structure, make it the thermal requirements meeting the buried Central drain manhole of tunnel in cold area, there is the advantage that easy construction, cost are controlled, easy to maintenance simultaneously.

The object of the invention is to be realized by following means:

Be used for the buried Central drain manhole structure of tunnel in cold area, be mainly used in the buried Central drain manhole insulation of tunnel in cold area underground construction.In the variable cross-section manhole arranged perpendicular to center Deeply buried ditch 500, arranged orthogonal forms an enclosure space 300 between the cover plate of upper layer 100 and lower floor's cover plate 200 of the borehole wall 400; The junction of cover plate of upper layer and lower floor's cover plate and the borehole wall is provided with airtight sealing mechanism.

Described airtight sealing mechanism is the paired occlusion structure of male and female, and the sealing mat being namely placed in cover plate bottom has the protuberance with the recess tabling of the sealing mat be arranged on the borehole wall.

Insulation construction of the present invention, by double-layer cover plate and sealing mat, has not only effectively completely cut off heat conduction, and controls heat convection current, thus plays the effect stoping heat to transmit, and reaches manhole insulation, prevents the object freezed.

The construction method of insulation construction of the present invention, can be summarized as the following steps:

1. in conjunction with the degree of depth of buried Central drain, determine the reasonable depth of manhole, apply the variable cross-section borehole wall by designing requirement.

2. respectively floating process is carried out to bilevel cover plate base, and female sealing mat is installed, ensure the closely connected of sealing mat and base.

3. upper and lower two-layer cover plate adopts prefabricate mode as far as possible, and public sealing mat is pressed design attitude installation firmly.

4. the cover plate that public sealing mat is housed is placed on base, ensures the occlusion completely of male and female sealing mat.

At the scene in use procedure, the environment of tunnel and Central drain is thoroughly isolated by the upper and lower two-layer cover plate with insulation layer and sealing mat, and also has a closed area between two cover plates, forms natural isolation layer, also can within it filling heat-barrier material 600, thus reach better heat insulation effect.

The present invention has the following advantages compared with buried Central drain manhole structure in the past:

1. by arranging a pair male and female airtight sealing mechanism between cover plate and base, the convection effect of heat has effectively been contained;

2. by adopting the mode of upper and lower two-layer cover plate, forming the enclosure space between cover plate, tunnel environment and manhole internal environment thoroughly being isolated, ensure that the heat insulation effect of manhole;

3. this structure construction is convenient, and cover plate and sealing mat mounting process simply, facilitate the maintenance and inspection work in later stage.

Accompanying drawing is described as follows:

Fig. 1 is the generalized section of manhole structure of the present invention.

Fig. 2 is manhole structure A-A generalized section of the present invention.

Fig. 3 is the partial enlarged drawing of airtight sealing mechanism in the present invention (110,210).

Detailed description of the invention

Below in conjunction with accompanying drawing and example, the present invention is described further:

Composition graphs 1 and Fig. 2 can see, a kind of buried Central drain manhole of tunnel in cold area that is used for constructs, in the variable cross-section manhole arranged perpendicular to center Deeply buried ditch 500, arranged orthogonal forms an enclosure space 300 between the cover plate of upper layer 100 and lower floor's cover plate 200 of the borehole wall 400; The junction of cover plate of upper layer and lower floor's cover plate and the borehole wall is provided with airtight sealing mechanism (110 and 210).

Composition graphs 3 can be seen, airtight sealing mechanism (110 and 210) is the paired occlusion structure of male and female, and the male sealing mat being namely placed in cover plate bottom has the protuberance 001 with recess 002 tabling of the female sealing mat be arranged on the borehole wall.

For the Novel inspection well structure of the buried Central drain of tunnel in cold area, be made up of the enclosure space of upper and lower two-layer cover plate and corresponding two pairs of sealing mats and centre.It applies process and comprises following a few step:

1. the degree of depth of integrating tunnel Central drain 500 and size, determine the degree of depth and the size of manhole, apply the variable cross-section borehole wall 400.

2. smooth process is carried out to cover plate base position, female sealing mat is installed and ensures the closely connected of female sealing mat and base.

3. two-layer cover plate (100 and 200) adopts prefabricate mode to make, and material can select concrete slab, immersion oil plank etc., at its surface spraying heat-barrier material, and installs public sealing mat in relevant position, carries out cover plate installation after transporting to scene.

4. the enclosure space 300 between two-layer cover plate, can determine whether filled heat insulating material depending on on-the-spot weather environment and thermal requirements.

Claims

1. one kind constructs for the buried Central drain manhole of tunnel in cold area, be mainly used in the buried Central drain manhole insulation of tunnel in cold area underground construction, it is characterized in that, in the variable cross-section manhole arranged perpendicular to center Deeply buried ditch (500), arranged orthogonal forms an enclosure space (300) between the cover plate of upper layer (100) and lower floor's cover plate (200) of the borehole wall (400); The junction of cover plate of upper layer and lower floor's cover plate and the borehole wall is provided with airtight sealing mechanism.

2. according to claim 1 for tunnel in cold area buried Central drain manhole structure, it is characterized in that, described airtight sealing mechanism is the paired occlusion structure of male and female, and the sealing mat being namely placed in cover plate bottom has the protuberance with the recess tabling of the sealing mat be arranged on the borehole wall.

3. according to claim 1 for tunnel in cold area buried Central drain manhole structure, it is characterized in that, the enclosure space (300) between two-layer cover plate is filled with heat insulating material (600).