50results about How to "Prevent piping" patented technology

The invention relates to a revetment structure composed of plastic steel plate piles and concrete. The revetment structure comprises plastic steel plate piles and a concrete coping, wherein the plastic steel plate piles are connected through a connector having two mutually matched ends; the concrete coping is preformed and can be stably buckled with the upper ends of the plate piles. The revetment structure can be used for revetments of rivers or lakes, is safe and stable, high in construction speed, low in construction cost, environment-friendly and pollution-free, less in influence on the surrounding environment, and long in durability, can be further used for resisting the seepage of embankments and dike bodies of rivers and protecting dams.

The invention discloses a hydraulic cylinder, which comprises a cylinder tube, a piston, a piston rod and an end cap, wherein the piston is positioned in the cylinder tube and is used for separating the cylinder tube into a first cavity and a second cavity, the piston rod is positioned at one side of the piston and is fixedly connected with the piston, the end cap is fixedly connected with an opening port of the cylinder tube, the piston rod penetrates out of the end cap, the piston is provided with a limiting device, the limiting device comprises a first one-way valve, a second one-way valve and a first push rod, an oil outlet of the first one-way valve is communicated with a first cavity, an oil inlet of the first one-way valve is communicated with an oil inlet of the second one-way valve, an oil outlet of the second one-way valve is communicated with the second cavity, one end of the first push rod extends into the second cavity, the first push rod can slide along the cylinder tube in the axial direction, and then the other end of the first push rod jacks up a valve core of the first one-way valve. The hydraulic cylinder has the advantages that the power in the piston movement process is reduced, and the piston is prevented from colliding with the end cap or the bottom wall of the cylinder tube, so the cylinder tube is protected.

The invention relates to supporting and construction method of a steel sheet pile under soft foundation of a high flow plastic deep layer, and belongs to the technical field of building construction. The supporting and construction method of the steel sheet pile under the soft foundation of the high flow plastic deep layer comprises the steps of construction preparation, construction of guiding purlins, injection of a steel sheet pile, excavation and water drainage, foundation trench interior construction and removing of the steel sheet pile. The supporting and construction method of the steel sheet pile under the soft foundation of the high flow plastic deep layer is simple and easy to implement during the construction process, is easy to popularize, and can effectively stop water and prevent piping, and almost all supporting and protecting facilities can be reused after being disassembled.

The invention discloses a deep foundation pit precipitation support construction method applicable to a coastal region. The deep foundation pit precipitation support construction method comprises the following steps of digging a foundation pit according to the shape of preset space; forming support piles and a water stopping curtain on the periphery of the foundation pit; arranging steel plate water stopping piles on the inner wall of the foundation pit; and arranging a light well point between each steel plate water stopping pile and the corresponding adjacent support pile. By the deep foundation pit precipitation support construction method applicable to the coastal region, the light well points for precipitation and the steel plate water stopping piles are arranged pointedly according to staggered distribution conditions of quicksand layers and water-resisting layers of the coastal region, and a precipitation effect of the deep foundation pit is guaranteed. In addition, by the steel plate water stopping piles, underground water can be stopped from bypassing a channel of the water stopping curtain, piping and quicksand can be prevented, and the construction quality of the deep foundation pit of the coastal region is ensured.

The invention relates to a foundation pile and a construction method thereof. The foundation pile comprises a top cover, an encircling wall which extends downwards from the periphery of the top cover, a division plate which is connected to the encircling wall in a mode of being spaced with the top cover, two positioning holes which pass through the encircling wall in opposite directions, and a plurality of pressure relief holes which pass through the encircling wall, wherein an accommodating space is formed by matching the encircling wall with the top cover; and the division plate divides theaccommodating space into a first accommodating part positioned between the top cover and the division plate and a second accommodating part spaced with the first accommodating part. The invention also discloses the construction method of the foundation pile. The division plate prevents cement slurry from flowing into the first accommodating part, the pressure relief holes can avoid the piping phenomenon, and the transverse bond stress of the foundation pile can be better improved after the cement slurry is solidified.

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 combined type steel sheet pile cofferdam for a deepwater bearing platform located in an abrupt slope hard rock river bed and a construction method, and belongs to the technical field of building construction. The construction method is improved based on a traditional construction method for the steel sheet pile cofferdam, and aims at overcoming the defects existing in construction of the deepwater bearing platform at present, located in the abrupt slope hard rock river bed, of a bridge, the combined type steel sheet pile cofferdam suitable for constructing the deepwater bearing platform located in the abrupt slope hard rock river bed can be formed by improving the arrangement mode of the combined type steel sheet pile cofferdam in water and the structure of the combined type steel sheet pile cofferdam, and the new construction method, which is simple, efficiency and safe, for the deepwater bearing platform located in the abrupt slope hard rock river bed is provided.