Crack width checking and control method of underground continuous wall

A technology of underground diaphragm wall and crack width, applied in the direction of calculation, computer-aided design, special data processing application, etc., can solve the problems of waste of reinforcement reinforcement of ground walls and large results, so as to reduce waste, improve work efficiency and reduce engineering costs. Effect

CN107341327AInactive Publication Date: 2017-11-10中船勘察设计研究院有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-11-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a crack width checking and control method of an underground continuous wall. The method is characterized in that a maximum bending moment under the characteristic combination of some working condition at a foundation pit construction stage is adopted, and a minimal protective cover thickness and a suggested component height are substituted into a formula required by a standard for checking until reinforcing bars of the underground continuous wall meets the requirements; the checking specifically comprises the following steps: calculating widths of primary reinforcing bars and cracks, thickness of a protective cover and height of a component, reinforcement ratio, equivalent stress of reinforcing steel bars, non-uniform coefficient of stress and maximum crack width. Compared with the prior art, the method has the advantage that on the premise of meeting and ensuring the safety of the structure, the waste of reinforcement for the underground continuous wall is reduced to the greatest extent, so that the engineering cost is further lowered.
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Description

technical field

[0001] The invention relates to the technical field of concrete structure design, in particular to a method for checking and controlling the crack width of an underground diaphragm wall. Background technique

[0002] With the rapid development of my country's technology and economy, the application of underground diaphragm walls in deep foundation pits is becoming more and more extensive. As a reinforced concrete structure, the underground diaphragm wall is allowed to have cracks. Usually, the check of the crack width is carried out using the "Code for Design of Concrete Structures". According to the experimental research method, since the thickness of the protective layer and the diameter of the steel bars of the underground diaphragm wall are large, and a maximum bending moment is to be experienced during the construction stage, the maximum bending moment in the general construction stage is greater than the final bending moment under long-term use conditio...

Examples

Embodiment 1

[0044] See attached figure 2 , the excavation depth of the foundation pit project is 14m, and the underground diaphragm wall + three concrete support enclosures are adopted. The combination of the underground diaphragm wall and the main structure is considered as a permanent component. The strength grade of the concrete of the underground diaphragm wall is C35 (ftk=2.20N / mm2), the main reinforcement of the steel bar is HRB400, and the thickness of the diaphragm wall is 800mm (h 墙 ), the thickness of the protective layer on the side facing the soil is 70mm (c s实 ), the thickness of the protective layer on the pit side is 50mm (c s实 ), the ground wall structure is considered as a single-reinforced rectangular cross-section beam, and the component width b = 1000mm. As a part of the permanent structure, the underground diaphragm wall is checked and calculated according to the third-level crack control according to the national standard. The crack width limit on the side facing ...