Double-wheel milling of soil-cement mixing wall (hereinafter referred to asCSMThe construction method is an innovative deep mixing construction method, which is a new construction technology of geotechnical engineering combining the existing hydraulic milling machine and deep mixing technology. That is, the original soil is cut by two milling wheels rotating around the horizontal axis, and the cement slurry is injected to form a uniform cement wall, which can be used as a cutoff wall, retaining wall or stratum reinforcement. Different from the traditional deep mixing method, the two groups of milling wheels rotate around the horizontal axis to form a rectangular reinforcement wall, instead of the single or multi-axis mixing head rotating around the vertical axis to form a cylindrical reinforcement wall.
The technology is simple, the operation is simple, the adaptability is strong, the social economic benefit is obvious, has got the good application and the popularization prospect in the construction of the foundation pit.
Quality control standards:
The construction quality of the ground wall is divided into twoJTJ303-2003In addition to the provisions of the Code for Design and Construction of underground Diaphragm Wall Structure for Port Engineering, the following requirements shall also be met:
The processing, installation and acceptance of steel components shall meet the requirementsGB50017-2017Code for Design of Steel Structures andGB50205-2012"Steel Structure Engineering construction quality acceptance Code" requirements.
ifHThe section steel has joints which are located below the face2mTwo adjacent onesH The section steel joint is staggered 1mThe above welding seam adopts groove welding and other strong welding, and the groove form and requirements of the weld seam meetJGJ81-2002The relevant provisions of Technical Regulations for Welding of Steel Structures in Buildings.
Quality assurance measures:
(1)According to the foundation pit enclosure scheme and site layout, the starting point and sequence of continuous wall construction can be determined to reduce the accumulation of errors in the construction process, reasonably arrange the construction machinery walking lines and exit roads, and avoid multiple relocation and displacement of equipmentH The insertion interval of section steel ensures the continuity of construction as far as possible.
(2)Before the construction of the trough machine and other mechanical equipment maintenance, as far as possible to reduce the construction process of equipment failure caused by quality problems. The device is operated by special personnel. Before working on the device, check the device performance to ensure the normal running of the device.
(3)Perpendicularity is calibrated by the intersection of two theodolites in front of each shift.
(4)Production of special positioning frame and guide frame, controlHAxis position and perpendicularity of section steel.
(5)Before construction, the underground obstacles should be removed in time to avoid the removal of equipment due to the underground obstacles found in the construction process. The disturbance of the surrounding soil caused by the obstacles will cause the wall displacement.
(6)The construction record of each continuous wall should be made as required, and the lap length of each wall panel should be strictly controlled to make it traceable so as to facilitate the follow-up problem handling.
(7)Compound the elevation and shaft deviation in time to ensure that the component is under axial compression.
Shanghai Qiangqiang Foundation Engineering Co., LTD. 's business covers foundation pit engineering, pile foundation engineering, land and waterFoundation treatment, slope treatment and other engineering fields. around "Excellent technology, reliable process, fast construction" technical requirements, is to provide customers with land, water foundation engineering technical consultation, construction services and other comprehensive solutions of the entity enterprise. Contact Number:400-1002850