68results about How to "Reduce the amount of grout" patented technology

The invention discloses a construction method of hand-dug piles. The method comprises the following steps: firstly, making preparation of construction, and making injection tubes and modifying a pneumatic pick; mounting a pneumatic pick head to the pneumatic pick, driving downward an annular injection tube annularly and radially along the base of an opening protective ring, and putting a cement mortar delivery hose at the rear end of the injection tube and fixing; making an injection liquid (i.e. cement mortar) composed of cement and water at a ratio of 1:0.75, adding a quick-setting agent into the injection liquid to reduce the time of osmosis; stopping injection when the injection amount of each injection tube reaches the design amount, and driving the exposed parts of the injection tubes into the soil by using the pneumatic pick; excavating the next segment, and connecting the concrete support wall with the top of the injection tubes; performing injection segment support wall construction; and after the excavation of each injection reinforcement segment is completed, repeating the previous steps till the loose gravel formation segment is passed through. The construction method has the advantages of simple construction, low investment, multi-segmental and circulating reinforcement and small injection amount, and can effectively prevent the loss of injection liquids, solidify the gravel formation, increase the friction force between the pile and the formation and improve the load-carrying capability of the friction piles.

The invention discloses a vertical mixed connection structure and method of prefabricated internal wallboards for assembling a shear wall structure. On the structure, edge components of upper-layer and lower-layer prefabricated internal wallboard structures are overlapped through vertical steel bars and U-shaped ribs, and horizontal reinforcing ribs and local cast-in-place concrete are arranged in a closed ring so as to realize the edge components equivalent to the cast-in-place concrete, the vertically distributed steel bars at the middle part of the components are connected in a manner of indirect overlapping by use of mortar anchor steel bars of a retention metal mortar anchor pipe so as to form an entire shear wall. By utilizing the local cast-in-place concrete moist joint at the edge component part formed by the mixed connection and the dry joint of bedding and grouting at the part of the vertically distributed steel bars, the shear strength and rigidity of the horizontal jointing part of the prefabricated internal wallboards are improved; casting holes reserved at the bottom of the edge components can be used for solving the problem of casting the local cast-in-place concrete; and the vertically distributed steel bars are connected in a manner of indirect overlapping by use of the mortar anchor, which facilitates the installation and temporary fixation of the wallboards on a concrete floor. The mixed connection structure of the prefabricated internal wallboards, provided by the invention, ensures the overall performance of the shear wall; and construction is convenient.

The invention relates to the field of tunnel construction, in particular to a rapid construction method of a high-pressure water-rich fault zone of a tunnel, which solves a plurality of problems in the construction method of high-pressure water-rich fault zone tunnels under the guide of the traditional knowledge. A draining branch tunnel is additionally arranged between a main tunnel and a parallel heading, the water flow pressure of the hanging wall of a fault interface is reduced progressively, and a large amount of water is discharged from the main tunnel by adopting a guiding and non-clogging mode; when the water pressure of the main tunnel is reduced to 0.3-0.5MPa, an informationized tracking and accurate grouting method is used for grouting and reinforcing the main tunnel; and rapidly excavating and sealing technology is used for excavating the main tunnel and the parallel heading. The invention adopts the technology combining the water distribution and pressure reduction mode, the informationized tracking and accurate grouting method and the rapidly excavating and sealing technology for high-pressure water-rich shattered fault zones for the first time, breaks through the traditional concept that the water distribution and pressure reduction mode is opposite to the grouting and reinforcing construction method, solves the world-class problem of construction of the high-pressure water-rich fault zone of the tunnel, improves the construction progress and the construction efficiency, and ensures safe and rapid perforation of the tunnel.

The invention discloses an anti-subsidence control method by supplying grouting in real time in shield construction. According to the anti-subsidence control method, a shield machine cutter, a shield shell, a shield tail brush, around soil layers, segments, a first annular segment, a second annular segment, a third annular segment, a water glass grout grouting pipe, an auxiliary synchronous grouting pipe, a main synchronous grouting pipe, a water glass grout grouting pump, a water glass grout preparation barrel, a shield machine cement grout synchronous grouting box and a ball valve are included. Synchronous grouting and secondary grout supplying are effectively integrated, cement injection and water glass injection are organically combined, therefore the timeliness and the effectiveness of filling of gap in the backs of the segments are strengthened, disturbances caused by intersection construction of a traditional secondary grouting and normal tunneling of the shield machine are eliminated, compared with the traditional secondary grouting method, cement grout does not need to be prepared separately, the grouting amount is greatly decreased by separately pumping the water glass grout, the construction schedule is speeded up, the automation level is improved by taking full use of self equipment of the shield machine, and the manpower and material resources are saved.