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Free-cutting concrete

A concrete and free-cutting technology, applied in the field of concrete, can solve problems such as shortening the construction period and speeding up the construction speed, and achieve the effect of filling the gaps in research and application.

Active Publication Date: 2019-05-03
SHANGHAI URBAN CONSTR MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when shields enter and exit the tunnel, underpinning, chiseling, and pulling out are often used. There are very few cases of directly passing through the diaphragm wall, and there is no precedent in the ultra-deep tunnel project. If the construction of the ultra-deep diaphragm wall can meet the Unde

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Example Embodiment

[0010] Hereinafter, the present invention will be further described with reference to the embodiments, which are only used for explanation and not for limiting the protection scope of the present invention.

[0011] In the embodiment, a dolomite material that is not commonly used in existing concrete is added. Due to the brittleness of dolomite, in order to prevent the degradation of concrete performance, dolomite is generally avoided. This application provides a concrete mix ratio through specific research on the mix ratio. Under this mix ratio, the characteristics of the dolomite itself can be used in the concrete, while simultaneously taking into account the cutting and grinding performance and the concrete itself Strength, get a concrete mix ratio containing dolomite, as follows.

[0012] This embodiment provides a free-cutting concrete, which is composed of 10-20% of the total weight of cementitious material, 28-35% of yellow sand, 40-45% of dolomite, and the balance of water ...

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Abstract

The invention relates to free-cutting concrete. The free-cutting concrete comprises, in terms of weight percentages in the total weight, 10-20% of a binding material, 28-35% of yellow sand, 40-45% ofdolomite and the balance water and admixtures, wherein the weight ratio of the added water to the binding material is 0.4-0.45, and the weight of the admixtures is 0.8-1.0% of the weight of the binding material, and the binding material is a mixture of cement and fly ash; and the particle size of the dolomite is 5-16 mm. The dolomite component which is not commonly used in the prior art is adoptedby the free-cutting concrete, and special adjustment is conducted on the ratio of the component, so that the obtained free-cutting concrete not only can meet constructability, high impermeability, high crack resistance, low shrinkage and other performance indexes of extremely-deep underground continuous wall concrete, but also can meet free-cutting performance of long-term (of 3 years or above) shield excavation; and a complete set of machinable concrete technologies in the field of extremely-deep tunnels is formed, and a blank in domestic and foreign researches and application is filled.

Description

technical field [0001] The invention relates to concrete, in particular to an easy-cutting concrete. Background technique [0002] With the rapid development of urban construction, tunnel projects including tunnels, subways, and deep storage pipelines have entered a stage of extraordinary development. In order to avoid urban traffic operations as much as possible, shield tunneling is often used for construction of such tunnel projects. Shield tunneling construction is a highly mechanized and automated tunneling construction method, which has high technical and economic advantages. It is extremely difficult for the excavating tool of the shield machine to directly excavate and break the concrete of the portal, and directly cutting the concrete will cause damage to the excavating tool of the shield machine, which has become a major problem in tunnel construction. Many scholars have done in-depth research on the technical measures of shield cutting concrete, but most of them f...

Claims

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Application Information

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IPC IPC(8): C04B28/00
Inventor 李欢欢董欢褚鑑堂毕振海张雯赵刚吴小琴刘超辛建刚朱言悦
Owner SHANGHAI URBAN CONSTR MATERIAL CO LTD
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