Bridge and culvert structure transition section anti-frost-heaving structure in cold region

A technology for cold areas and structures, applied in buildings, roads, roads, etc., can solve the problems of reduced frost heave resistance, low service life, poor integrity, etc., to improve frost heave performance, increase service life, and reduce the amount of filler. Effect

Active Publication Date: 2016-10-26
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1 An additional insulation layer is required, and the construction process is complicated;
[0006] 2 Under complex dynamic load and ambient temperature conditions, the long-term effect of external wall insulation alone cannot be guaranteed
[0007] 3 The packing layer processed with gravel mixed with cement has poor dynamic load resistance;
[0008] 4. The homogeneity of the filling layer cannot be guaranteed during field constructi

Method used

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  • Bridge and culvert structure transition section anti-frost-heaving structure in cold region
  • Bridge and culvert structure transition section anti-frost-heaving structure in cold region

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1:

[0035] Such as figure 1 As shown, at the junction of the bridge and the subgrade, the antifreeze structure layer 1 is provided between the sidewall 2 of the bridge foundation and the subgrade filling material 3. The longitudinal cross-sectional shape of the antifreeze structure layer 1 is a right-angle trapezoid with a narrow top and a wide bottom. The antifreeze structure layer 1 The height of is in contact with the side wall 2 of the bridge foundation, the top of the antifreeze structure layer 1 is laid with road filler 4, and the outer side of the hypotenuse of the antifreeze structure layer 1 is the roadbed filler 3.

[0036] The antifreeze structural layer adopts a foam concrete filler layer, and the foam concrete is added with a thickener.

[0037] In order to ensure the quality of on-site construction, a special thickener for cast-in-place foam concrete was specially developed (see Examples 3-7 for details of the thickener) to make the porosity of the on-si...

Example Embodiment

[0038] Example 2:

[0039] Such as figure 2 As shown, at the connection part of the culvert and the subgrade, the antifreeze structure layer 1 is provided between the culvert side wall 5 and the subgrade filling material 3. The longitudinal cross-sectional shape of the antifreeze structure layer 1 is a right-angle trapezoid with a narrow upper and a wide bottom. The height is in contact with the side wall 5 of the culvert, the top of the antifreeze structure layer 1 is laid with pavement filler 4, and the outer side of the hypotenuse of the antifreeze structure layer 1 is the roadbed filler 3.

[0040] It is worth mentioning that the antifreeze structure layer can also extend from the top to the side of the horizontal building to cover the top of the horizontal building, which is also within the protection scope of the present application.

Example Embodiment

[0041] Example 3:

[0042] The formula of thickener added to foam concrete is: silica fume: 60 parts; bentonite: 70 parts; xanthan gum: 1 part. When preparing, weigh according to the above-mentioned ingredients and weight percentage, and put it at room temperature. Put it into the container and stir evenly. When the thickener is used, it is added according to the weight of the thickener accounting for 8% of the weight of the cement in the foam concrete.

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PUM

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Abstract

The invention relates to a bridge and culvert structure transition section anti-frost-heaving structure in a cold region. The portion between the connecting portions of a side wall of a transverse building and a roadbed is filled with an anti-frost structural layer in a built manner. The longitudinal profile of the anti-frost structural layer is almost in a right trapezoid shape with the upper portion narrower than the lower portion. The longitudinal right-angle side of the trapezoid of the anti-frost structural layer faces the side wall of the transverse building. The longitudinal profile of the anti-frost structural layer is designed in the trapezoid with the upper portion narrower than the lower portion, the anti-frost-heaving effect can be guaranteed, meanwhile, materials are saved to the maximum extent, and the structure is low in construction cost, scientific and reasonable.

Description

technical field [0001] The invention relates to an anti-frost heaving structure for the transition section of bridge and culvert structures in cold regions. Background technique [0002] Frost heave is caused by the freezing of water in the soil and the growth of ice (especially the convex mirror-shaped ice body), which causes the expansion of the soil and the uneven uplift of the ground surface. There are many factors that lead to soil frost heaving, including soil quality, water state, negative temperature environment, salt content of water and soil, pressure on the upper part of the soil layer, and so on. These factors comprehensively determine and affect the frost heaving property of soil in a certain area. In summary, there are three main aspects, namely soil, water and temperature. [0003] However, when building horizontal structures such as culverts, frame bridges, and box bridges in cold regions, the existence of horizontal structures will have adverse effects on ...

Claims

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Application Information

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IPC IPC(8): E01C3/06
CPCE01C3/06
Inventor 谭贤君陈卫忠田洪铭袁敬强
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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