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Above-water coating construction method for reducing negative friction force of pile body

A technology of negative friction force and construction method, which is applied in the direction of geotextile, sheet pile wall, foundation structure engineering, etc., can solve the problems of collision damaged pile body investment, failure to popularize, poor fixation, etc., to achieve small investment, reduce The effect of small adverse effects and convenient material collection

Inactive Publication Date: 2017-12-08
长江河湖建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For measures to reduce the negative friction of existing pile foundations under the action of surcharge on soft soil foundations, for pile foundations with very strict settlement requirements, the soil around the pile is generally reinforced or the method of supplementing piles is used; for pile foundations with general settlement requirements At present, the steel casing method is commonly used, which can reduce the influence of negative friction, but because the casing method has the disadvantages of poor fixation, easy inclination, collision damage to the pile body, and large investment, it is often unavoidable in engineering practice. To the popularization, people tend to adopt the method of soil reinforcement around the pile or the method of supplementing piles to deal with this kind of pile foundation, resulting in great waste

Method used

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  • Above-water coating construction method for reducing negative friction force of pile body
  • Above-water coating construction method for reducing negative friction force of pile body
  • Above-water coating construction method for reducing negative friction force of pile body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] An above-water coating construction method for reducing the frictional force of the pile body, the part of the pile body above the water surface is the above-water pile body 1, and the part of the pile body under the water is the underwater pile body:

[0024] Before the asphalt is applied, clean the surface of the pile body first, and apply cold bottom oil on the surface of the dried pile body 1 above water to form the upper cold bottom oil layer 2. Because the cold bottom oil has low viscosity and good fluidity, it can be applied on the pile body On the concrete surface, it can quickly penetrate into the surface pores of the pile body, and after the solvent volatilizes, it will be firmly combined with the pile surface. The asphalt is heated to 150°C, and the upper asphalt layer 3 is formed on the surface of the pile body 1 after the cold base oil has penetrated or volatilized. The thickness of the upper asphalt layer 3 is 8mm. The thickness of the upper cold bottom oi...

Embodiment 2

[0032] In this embodiment, the asphalt is heated to 165° C. and poured on the surface of the pile body 1 on the water after the cold base oil has penetrated or volatilized, and the thickness of the upper asphalt layer 3 is 9 mm. The thickness of the upper cold bottom oil layer 2 is 0.5mm, and the thickness of the upper geotextile layer 4 is 3.5mm. The asphalt used in the upper asphalt layer 3 has a softening point of 55°C and a penetration of 60dmm at 25°C. The surface of the asphalt layer is wrapped with geotextiles and finally reinforced outside the geotextiles. Other contents of the technical solution of this embodiment are the same as those of Embodiment 1.

Embodiment 3

[0034] Heat the asphalt to 180°C and pour it on the surface of the pile body 1 above the water after the cold base oil has penetrated or volatilized. The thickness of the upper asphalt layer 3 is 10mm. The thickness of the upper cold bottom oil layer 2 is 0.8 mm, and the thickness of the upper geotextile layer 4 is 5 mm. The asphalt used in the upper asphalt layer 3 has a softening point of 60°C and a penetration of 70dmm at 25°C. The surface of the asphalt layer is wrapped with geotextiles and finally reinforced outside the geotextiles. Other contents of the technical solution of this embodiment are the same as those of Embodiment 1.

[0035] A new embankment needs to cross the existing approach bridge of an enterprise, such as figure 2 with image 3 As shown, in order to ensure the normal operation of the approach bridge during embankment construction, the constraints of vertical displacement and horizontal displacement must be met, otherwise, reinforcement measures must ...

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Abstract

The invention discloses an above-water coating construction method for reducing negative friction force of a pile body. An above-water pile body is a part of the pile body located above a water surface, and an under-water pile body is a part of the pile body located under the water. The construction method for above-water coating for reducing the negative friction force for the pile body comprises the steps that the surface of the above-water pile body after dried is coated with cold base oil, and after the cold base oil infiltrates the above-water pile body or volatilizes from the surface of the above-water pile body, heated asphalt is poured on the surface of the above-water pile body to form an upper section asphalt layer; and the surface of the asphalt layer is wrapped with geotextile, and finally reinforcing is conducted on outside of the geotextile. The above-water coating construction method for reducing the negative friction force of the pile body is simple in process, convenient to operate and low in investment, after on-site monitoring for an actual project, it is shown that operability for reducing the negative friction force of the pile body is high, and the effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and in particular relates to a method for reducing the adverse effect of negative friction by applying asphalt on the surface of a pile body and wrapping it with geotextile. Background technique [0002] Large-area surcharge on deep soft soil foundation, due to inconsistent settlement of piles and soft soil, negative friction will adversely affect the existing pile foundation above the neutral point, increase the axial force of the pile body, and reduce the load bearing capacity of the pile foundation force, which poses a threat to pile foundation engineering. [0003] How to take measures to reduce the impact of negative friction on piles is a technical issue that needs to consider not only safety and reliability, but also economical rationality. For measures to reduce the negative friction of existing pile foundations under the action of surcharge on soft soil foundations...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/60E02D27/52
CPCE02D5/60E02D27/52E02D2300/009E02D2300/0098
Inventor 彭良泉范志强李纲肖义马卓周定刚薛嵩郭锐
Owner 长江河湖建设有限公司
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