61results about How to "Avoid floating phenomenon" patented technology

The invention relates to recycled concrete produced from construction wastes and a production method thereof. The recycled concrete is prepared by mixing and stirring recycled coarse aggregates, recycled fine aggregates, binding materials and water and is C10-C20 in strength grade, wherein each cubic meter of the recycled concrete contains the following components: 650-770kg / m<3> of recycled coarse aggregates, 576-764kg / m<3> of recycled fine aggregates, 267-400kg / m<3> of binding materials and 255-345kg / m<3> of water; the recycled concrete is used for preparing wallboard components or walls having not high requirement on strength. The recycled concrete is produced from waste bricks which serve as recycled coarse aggregates and waste concrete functioning as recycled fine aggregates through reasonable proportions, so that the recycled concrete meets a requirement of constructing walls and wallboards, thus solving problems in recycling waste bricks and waste concrete in the construction wastes and solving preparation technical problems.

The invention discloses a subway station expanding method by using a reverse method under an operating condition, and relates to the technical field of underground space development. The subway station expanding method solves the problems of complex construction process, long construction period and the high construction cost of connecting of a new subway station and an old subway station and existed in a method for improving the carrying capacity by newly building subway routes. The subway station expanding method comprises the steps that 1, original well and receiving well construction is conducted; 2, pipe-shed construction and grouting reinforcement are conducted; 3, a first underground layer soil body is excavated, temporary support is arranged, steel pipe pile construction is conducted to build a vertical enclosure structure of a second underground layer, steel pipe piles are lengthened to make the tops of the steel pipe piles be connected with the top of a first underground layer, and first underground layer bottom plates are casted, and a soil taking opening is reserved; 4, a second underground layer soil body is excavated till the tunnel center height, an upper layer segment is removed, but bottom standard blocks are reserved; and excavating is continued to the bottom plate position of the second underground layer, and the bottom standard blocks are removed, cast-in-situ of bottom plates of second underground layer is conducted, prefabricated concrete bottom plates with tracks are laid, and the structure is connected with the existing station after being finished.

The invention relates to recycled concrete produced from construction wastes and a production method thereof. The recycled concrete is prepared by mixing and stirring recycled coarse aggregates, recycled fine aggregates, binding materials and water and is C10-C20 in strength grade, wherein each cubic meter of the recycled concrete contains the following components: 650-770kg / m<3> of recycled coarse aggregates, 576-764kg / m<3> of recycled fine aggregates, 267-400kg / m<3> of binding materials and 255-345kg / m<3> of water; the recycled concrete is used for preparing wallboard components or walls having not high requirement on strength. The recycled concrete is produced from waste bricks which serve as recycled coarse aggregates and waste concrete functioning as recycled fine aggregates through reasonable proportions, so that the recycled concrete meets a requirement of constructing walls and wallboards, thus solving problems in recycling waste bricks and waste concrete in the construction wastes and solving preparation technical problems.

The invention discloses a pre-clamping device for a clamp. According to the pre-clamping device for the clamp, when a workpiece is pre-tightened by means of a pressing plate, the workpiece is pre-clamped, an ejector rod mechanism makes contact with the pressing plate all the time, the phenomenon that the pressing plate is suspended is effectively avoided, and thus the workpiece can be pre-clamped more reliably. The pre-clamping device for the clamp is simple, reliable and high in universality, and the workpiece can be effectively prevented from turning on one side after being installed and positioned.

The invention relates to a biological bamboo fiber mask base cloth with high water preservation performance and an anti-dropping function and a moisture mask with high water preservation performance.A preparation method of the mask base cloth includes the following steps that 1, nanometer bamboo carbon powder is modified by a silane coupling agent to obtain modified bamboo carbon powder; 2, the modified bamboo carbon powder and a dispensing agent are added into a gelatin solution and dispersed uniformly to obtain bamboo slurry; 3, polylactic acid is dissolved in trichloromethane to prepare aspinning solution, the spinning solution is subjected to electrostatic spinning to obtain a polylactic acid fibrofelt, and the polylactic acid fibrofelt is soaked in the bamboo slurry for dipping andmodification to obtain a modified fibrofelt; 4, sodium alginate is added into chitosan liquid for dissolution to obtain a finishing liquid, and the modified fibrofelt is soaked in the finishing liquidfor after-finishing to obtain a compound fibrofelt; 5, hydroentangling and reinforcement are conducted on the compound fibrofelt to obtain a finished product. The obtained biological bamboo fiber mask base cloth has an excellent constraint capability on essence liquid and great liquid preservation and moisture releasing performance. After the essence liquid is loaded on the cloth by liquid suspension, the moisture mask with high water preservation performance is obtained, the situation that loss of the essence liquid is caused since the essence liquid flows down and drops is avoided, and waste is prevented.

The invention discloses an oil layer protective agent for drilling fluid and a preparation method thereof, belonging to the field of oil field chemistry. The oil reservoir protection agent comprises the following components in parts by weight: a bridging body, a filling body, and 2-4 parts of a flow regulator; All coated on the first mixture to obtain, the first mixture includes: 5-30 parts of walnut shell particles, 5-20 parts of coconut shell powder, 10-20 parts of ramie fiber, 5-10 parts of sisal powder; filler Obtained by coating 0.1-0.5 parts of surface modifier on 15-30 parts of calcium carbonate powder. The oil layer protection agent has good compatibility with the drilling fluid, has little effect on the viscosity increase of the mixed system of the oil layer protection agent and the drilling fluid, does not foam, and the mixed system can effectively protect the reservoir.

An anti-vibration adjustment support, the adjustment support, from top to bottom, are arranged in sequence: a bowl-shaped gasket, a screw sleeve, a fixed nut, a nut seat, a positioning pin, and a fixed plate; the bowl-shaped gasket cover On the top of the screw sleeve; the screw sleeve is tubular, the inner wall of the tube is provided with a right-handed internal thread, the outer wall of the tube is divided into two sections, the lower section is circular, with a left-handed external thread, and the upper section is hexagonal; The pitch of the right-handed internal thread and the left-handed external thread is the same; the fixed nut is a left-handed internal thread, connected with the left-handed external thread of the screw sleeve; the fixed nut is fixedly connected on the nut seat; the nut seat is fixedly connected on the fixed plate. The invention utilizes the adjustment and support function of the adjustment support to meet the needs of the four mounting feet when the diesel engine is installed. Vibration creates looseness.