49results about How to "Stop the collapse" patented technology

A cyclonic separator having an outer wall and an inner wall, and a shroud disposed between the outer wall and the inner wall, the inner wall having one or more outwardly projecting members, the shroud having upper and lower portions, and a mesh secured between the upper and lower portions, the lower portion having a flange that extends radially inward towards the inner wall, wherein the flange has one or more flexible portions, and the outwardly projecting members abut the flexible portions so as to bias the lower portion away from the upper portion to thus tension the mesh.

It relates to a method of predicting the collapse and crack pressure underground with the drilling head. Recording the earthquake status of a well to be drilled and several other adjacent drills that have already been drilled, getting the earthquake record of the well to be drill and already drilled through weighting, through sound wave echoing difference and density measuring for the already drilled wells to get the log data of different strata, a hierarchical model can be established to predict the sound wave speed and wave resistance of each strata based on the earthquake record. Through the log curve predicted of the strata of the well to be drilled, the collapse and crack pressure of the strata can be predicted combined with the interpretative model of the well wall stability mechanics logging. It can effectively prevent the collapse of the well wall and accidents occurrence underground.

The invention discloses a method for preparing a noble metal / TiO2-C catalyst for hydrofining of crude terephthalic acid. The method sequentially comprises the following steps of: (1) adding a macromolecular compound into an organic solvent to obtain clarified solution containing the macromolecular compound; (2) adding TiO2 powder; (3) adding TiO2 powder and gel, and performing extrusion molding; and (4) soaking the TiO2-C composite carrier obtained in the step (3) into solution containing a noble metal compound, and performing calcination and hydrogen reduction to obtain the noble metal / TiO2-C catalyst for hydrofining of the crude terephthalic acid. The Pd / TiO2-C catalyst has high specific surface area and pore volume, stable crystal structure and high activity; and the terephthalic acid after hydrofining has low impurity content. The preparation method is simple in process, does not produce any adverse influence on the catalyst, and is suitable for industrialized production.

The invention discloses a method for preparing a TiO2-C composite carrier for a p-carboxybenzaldehyde hydrogenation process. The preparation method sequentially comprises the following steps of: (1) adding a macromolecular compound into an organic solvent to obtain clarified solution containing the macromolecular compound; (2) adding a part of TiO2 powder; and (3) mixing the macromolecular compound modified TiO2 powder obtained in the step (2), the reset TiO2 powder and gel uniformly, kneading the mixture uniformly, and performing extrusion molding. The obtained formed product is thermally solidified and roasted in nitrogen atmosphere to form the TiO2-C composite carrier. The TiO2-C composite carrier has high specific surface area and pore volume and stable crystal structure, a Pd / TiO2-C catalyst prepared by using the carrier has high activity, and the conversion rate of the p-carboxybenzaldehyde can reach 99.5 percent. The preparation method is simple in process and is suitable for industrialized production.

The invention discloses a suspended formwork lining method for a cover arch outside a tunnel portal with weak surrounding rocks. The method comprises the following steps of mounting a first cover arch grid steel frame and a small advanced pipe shed to form a tunnel locking port; mounting second and third groups of cover arch grid steel frames to form an integral steel frame; arranging longitudinal steel pipes, laying bamboo plywood, and connecting the longitudinal steel pipes and the integral steel frame to form a formwork support system by using iron wires; pouring concrete to finish the construction of a reinforced concrete cover arch, and the like. According to the method, a framework is arranged in reinforced concrete to serve as a support system for a concrete formwork, and a suspended formwork construction technology is adopted for pouring the concrete, so that support to the front slope of the tunnel portal with the weak surrounding rocks is formed within an extremely short time, the displacement and the glide of the open channel front slope and the open channel side slope of the portal are effectively prevented, the large-area collapse of an open channel mountain body is prevented, and the safety holing of a tunnel is ensured; and the method is applied to temporary projects under the emergency conditions of lack of external support components for concrete-poured formworks, irregular poured concrete structures, high requirements on construction time and high speed.

The invention relates to the field of construction wallboards, in particular to a manufacturing method for a seismic lightweight wallboard. The manufacturing method comprises the step of die making: making a seismic frame die and a cushioning interlayer die which are used for pouring a seismic frame and a cushioning interlayer separately; the step of preparation of pouring materials: selecting ceramisite, high impact resistance polystyrene particles, polypropylene fiber and hydroxypropyl methyl cellulose, and preparing the pouring materials; the step of pouring: putting the pouring materials into the seismic frame die, and forming an upper cross beam, a lower cross beam, a left side beam and a right side beam by pouring; putting the pouring materials into the cushioning interlayer die, andforming the cushioning interlayer by pouring; and the step of wallboard making: connecting the cushioning interlayer with tongue-and-groove of the upper cross beam and the lower cross beam through tenon, and fixedly connecting the left side beam and the right side beam with the upper cross beam and the lower cross beam. According to the manufacturing method, the problems of low rigidity and poorseismic performance of an existing wallboard are solved.