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.

The invention relates to a natural gas buried pipe anti-frost heaving system combining solar energy and geothermal energy. The natural gas buried pipe anti-frost heaving system comprises a pipe heat exchange device, a solar heat collecting device and a ground source heat pump. The pipe heat exchange device is composed of a natural gas buried pipe and a heat exchange medium channel used for exchanging heat with the natural gas buried pipe. The two ends of the heat exchange medium channel are connected with a main heat exchange medium pipeline, and a first branch pipe and a second branch pipe are connected to the main heat exchange medium pipeline in parallel. The first branch pipe is provided with the solar heat collecting device, and the heat exchange branch pipe is provided with the ground source heat pump. Compared with the prior art, the solar heat collecting device and the ground source heat pump are reasonably combined, and the win-win situation that the natural gas buried pipe is effectively protected against frost heaving, renewable energy sources are fully utilized, and high-grade electric energy consumption is reduced can be achieved; moreover, the environmental benefits of the natural gas buried pipe anti-frost heaving system are remarkable, long-distance heat conveying is not needed, and the basic national policy of saving energy and reducing emission of China is met; and the natural gas buried pipe anti-frost heaving system has good energy saving space and higher practical value.

The invention relates to a high grade road surface double layer micro-process and the construction method. The construction water proof layer is laid on the road surface, and a skid resistance wearing coat is laid on the construction water proof layer. The amounts by weight or volume of water proof layer is that: aggregate is 100; polymer modification positive ion emulsified asphalt is 8 to 16; water is 6 to 11; Portland cement or slaked lime is 1 to 4; and additive is 0.1 to 0.5. The amounts by weight of skid resistance wearing coat is that: aggregate is 100; polymer modification positive ion emulsified asphalt is 6 to 11; water is 7 to 13; Portland cement or slaked lime is 1 to 3; and additive is 0.1 to 0.5. The construction process is the following steps: cleaning the road surface, laying out, laying water proof layer, laying skid resistance wearing coat, early days conserving and quality checking out. The invention is reasonable designed, good performance of water proof, and fast moulding.