34results about How to "Prevent frost heave" patented technology

A thermal-insulation curing construction device for tunnel lining concrete is characterized by comprising a first trolley, a second trolley and a third trolley which are connected sequentially or the first trolley and the second trolley or the second trolley and the third trolley or the first trolley and the third trolley, and templates supported by supporting rods are arranged on the three trolleys. The device has the benefits as follows: firstly, thermal insulation is performed on a secondary lining through the three construction trolleys, and the temperature difference between the inside and the outside is reduced; secondarily, thermal insulation and moisturizing are performed on the concrete, and the concrete is prevented from frost-heaving; finally, the concrete is slowly cooled through a cooling layer, and the quality problem caused by the large temperature difference before and after construction is avoided. The device has the advantages of stable construction quality and low manufacturing price and has the broad market prospect.

The invention discloses a watertight device of a heating machine for passing in and out a door opening. The watertight device is used for a working well which is provided with an enclosure structure, the enclosure structure is provided with the door opening, the watertight device comprises a freezing pipe for injecting a refrigerant, the freezing pipe is partially or fully wound around the inner wall of the door opening, and the enclosure structure is also provided with a grouting pipe communicated with the space encircled by the freezing pipe. The invention also discloses another watertight device of the heading machine for passing in and out an door opening, wherein the watertight device is used for a working well which is provided with an enclosure structure, a lining structure is arranged at the inner side of the enclosure structure and provided with the door opening, the watertight device comprises a freezing pipe for injecting a refrigerant, the freezing pipe is partially or fully wound around the inner wall of the door opening, and the lining structure is also provided with a grouting pipe communicated with the space encircled by the freezing pipe. On the premise of meeting watertight requirement on the heading machine for passing in and out the door opening, the invention fully utilizes the space of the enclosure structure or the lining structure to reduce or avoid the internal working well space occupied by the watertight device for passing in and out the door opening.

The invention discloses a construction method for permafrost soil filling. The specific construction process includes construction preparation, measurement and lofting, site cleaning, leveling and compaction, embankment filling, layered filling of water-permeable materials, rolling compaction, non-total freezing For subgrade construction and fully frozen subgrade construction, self-inspection shall be carried out in time after each process is completed, and inspection shall be submitted after passing the inspection. The method of the invention aims at the cause of the frost heave of the roadbed in the permafrost area, combined with the existing construction experience in the permafrost area, and reduces the groundwater level and the original content in the roadbed filler by cutting off the infiltration of surface water and the way of rising capillary water. The water content can be kept near the optimal water content, thereby cutting off the water supply source during the ice accumulation process, thereby effectively preventing the frost heave of the roadbed caused by unreasonable filling materials and processes during construction, and ensuring the road quality after opening to traffic.