37results about How to "Avoid local instability" patented technology

The invention discloses a reinforcement device for preventing flexural-torsional buckling of angle steel for iron towers. The reinforcement device comprises a restraint component outside the angle steel and a ribbing restraint component inside the angle steel. The restraint component is an 'L'-shaped supporting plate I, the ribbing restraint component comprises an 'L'-shaped supporting plate II, and a plurality of reinforcement rib plates with rectangular cross sections are arranged at intervals inside the 'L'-shaped supporting plate. A gap for clamping the angle steel is formed among the 'L'-shaped supporting plate I and each reinforcement rib plate, and the 'L'-shaped supporting plate I and the 'L'-shaped supporting plate II are assembled together to form an external square reinforcement device.

The invention relates to a rod type core bar bending restrain steel support which solves the problems of large difference of rigidity and stability of all directions of an energy dissipation section of the traditional bending restrain support, difficult support installation and complex restrain construction. A core main stress part comprises an energy dissipation section, conversion sections and an installation section, wherein the energy dissipation section is a solid steel bar or hollow steel pipe; an outer restrain steel part comprises a local restrain steel member and an integral restrainsteel member, the local restrain steel member comprises a core bar steel sleeve, the integral restrain steel member comprises a delay steel frame fixed outside the core bar steel sleeve and an auxiliary steel cylinder; one section of the two conversion section is in friction contact with the steel cylinder of the conversion section and a gap is remained between the core bar steel sleeve and the delay steel frame. The section of the energy dissipation section of the support has uniform size in all directions, which eliminates the difference of the rigidity and the stability of different directions, thus the local stable bearing capacity and the integral bending-preventing capacity are high, and the working reliability under large axial direction strain and strong shock is high; and the rodtype core bar bending restrain steel support is convenient for installation, and is suitable for engineering earthquake fortification and reinforcement.

The present invention relates to structural engineering technology, and is especially one kind of flexure preventing energy dissipating steel pipe support, which comprises axial force unit of circular steel pipe, constraint unit of concrete poured inside the steel pipe, isolating unit set between the circular steel pipe and the concrete, and connecting unit in the ends of the support for connection between the support and the frame structure. Of the present invention, the axial force unit has very high rigidity to avoid the integral unstability of the support effectively, the filled concrete can avoid local unstbility and high order flexure of the axial force unit, and the support has plump hysteresis curve in both compressed or pulled state.

The invention discloses an assembled anti-instability test loading device for a T-shaped beam, which includes a loading reaction frame fixedly connected to a lower beam; the lower beam is fixed on a ground anchor system; and a pair of The anti-instability bracket, the anti-instability bracket includes a diagonal bar and a vertical bar, and the vertical bars of a pair of anti-instability brackets are arranged oppositely, and the anti-instability bracket is assembled and connected with the long hole of the lower beam; it also includes a clamping mechanism, The clamping mechanism is installed on the vertical bar; the clamping mechanism is in contact with the web of the T-beam test piece; it also includes a pressure applying mechanism, and the pressure applying mechanism is applied to the T-beam test piece. parts to apply test pressure. The invention prevents the test piece from overturning or local instability, and will not affect the test results of the T-shaped beam test piece in the whole process, has a high degree of assembly, is easy to install, and can be reused; it can be applied to different sizes and different types T-beam specimens with wide applicability.

The invention discloses a collapsible loess area building foundation reinforcing pile. The collapsible loess area building foundation reinforcing pile comprises an upper pile foundation, a lower pile foundation, an underpinning steel pipe and an operating pit. The lower end of the upper pile foundation is connected with the upper end of the lower pile foundation. The upper end of the upper pile foundation sequentially penetrates a self-weight collapsible loess layer and a lower backfill soil layer and stretches into a concrete bearing platform. The lower end of the underpinning steel pipe is connected with the upper pile foundation, the upper end of the underpinning steel pipe is connected with a building foundation, a pile foundation channel is formed in the self-weight collapsible loess layer, and a gap is formed between the upper pile foundation and the side wall of the pile foundation channel. According to the reinforcing pile, the influences of negative friction of the self-weight collapsible loess layer on the upper pile foundation can be effectively eliminated, and it is guaranteed that loads transmitted by the reinforcing pile are borne by friction between the lower pile foundation and a non-collapsible loess layer. The invention further discloses a pile pressing construction method. The method includes the steps of excavation of the operating pit; construction of the lower pile foundation; construction of the upper pile foundation; connection of the upper pile foundation and the building foundation; and construction of the concrete bearing platform. The pile pressing construction efficiency is improved through the pile pressing construction method.

The invention discloses a prefabricated corrugated steel plate lattice-type enclosure structure and a construction method thereof. The structure includes a number of frame-structured enclosure units, each enclosure unit includes a transverse enclosure portion and a longitudinal enclosure portion filled with concrete, and a truss as a bending component is arranged inside the transverse enclosure portion. The interior of the enclosure is provided with a lattice column as an axial force-bearing member. The truss and the lattice column are connected to each other and bonded with the concrete to form a whole. It is composed of channel steel, a channel steel is arranged in the cavity formed by each peak-to-peak part, the flange of the channel steel is connected with the wave crest in the cavity, and the opening direction of the channel steel in the adjacent cavity is opposite. The invention solves the problem that the envelope structure is only regarded as a non-structure in the traditional building form, is convenient for timely replacement when damaged, and ensures that the structure has good mechanical properties.

The invention discloses a reaction tower .The reaction tower comprises a tower body, one or more bearing columns and one or more annular structural beams, the bearing columns are arranged on the outer wall of the tower body in the axial direction of the tower body, the annular structural beams are arranged on the outer wall of the tower body in the circumferential direction of the tower body, and the bearing columns, the annular structural beams and the tower body are linked to be an integral structure .The bearing columns can bear most vertical load, local buckling of the tower body is avoided, and the annular structural beams can play a role in transverse linkage and reinforce integral rigidity of the tower body, so that the tower body has the capability of bearing large vertical load and transverse load .The bearing columns, the annular structural beams and the tower body are linked to be the integral structure, so that wall plates of the tower body, the bearing columns and the annular structural beams are integrated into a whole, the stable integral structure is formed, the reaction tower can form a rigid barrel body, good structural stability can be achieved without making the wall thickness be high, the structure is stable and firm, and manufacturing cost is saved.

The invention discloses a reinforcement device for preventing flexural-torsional buckling of angle steel for iron towers. The reinforcement device comprises a restraint component outside the angle steel and a ribbing restraint component inside the angle steel. The restraint component is an 'L'-shaped supporting plate I, the ribbing restraint component comprises an 'L'-shaped supporting plate II, and a plurality of reinforcement rib plates with rectangular cross sections are arranged at intervals inside the 'L'-shaped supporting plate. A gap for clamping the angle steel is formed among the 'L'-shaped supporting plate I and each reinforcement rib plate, and the 'L'-shaped supporting plate I and the 'L'-shaped supporting plate II are assembled together to form an external square reinforcement device.

The invention provides a U-shaped steel bracket and a method for controlling roadway surrounding rock by graded active loading. The U-shaped steel bracket: two shed legs are connected to the two ends of the beam through connecting pieces, and the arc-shaped horizontal brace is arranged at the lower part of the beam. The cable plate and the lower clamping cable plate are respectively arranged above the cross beam and below the arc cross brace, and are connected by two lengthened cross braces loaded with bolt rods; the method of controlling the surrounding rock of the roadway: laying trapezoidal U-shaped steel brackets; installing arc cross braces support; connect arc-shaped cross braces and beams; carry out active loading of support force; provide comprehensive support for the roadway. The support has the function of active support, the overall rigidity is strong, and the support force can be adjusted reasonably according to the pressure and deformation of the surrounding rock, which can effectively improve the support strength; this method can provide a support method with hierarchical active loading, which can effectively realize U The passive loading mode of the section steel support is an active loading mode, which can form an effective support for the roadway and can effectively improve the safety production work of the coal mine.

The invention discloses a method of constructing a variable height steel girder by using a lifting and pushing support. The method comprises the following steps of: step 1. prefabricating a steel girder; step 2. installing a lifting and pushing support on piers, and meanwhile erecting an assembly platform; step 3. splicing a steel nose girder and the first segment of steel girder on the assembly platform, then connecting I-shaped steel to the top flanges of the steel girder and the steel nose girder by screws, arranging the I-shaped steel in a steel channel slideway of the lifting and pushing support, realizing the periodic lifting and pushing of the steel girder through the alternative matching of a fixed lifting machine and a movable lifting machine, thereby enabling the steel girder to continuously advance; step 4. before the steel nose girder reaches the third pier, assembling the next segment of steel girder at the tail of the upper segment of steel girder, and continuously lifting and pushing the steel girder according to the method of the step 3; step 5. repeating the step 4 until completing the erection of the integrated bridge; and step 6. dismantling the steel nose girder, the assembly platform and the lifting and pushing support, thereby completing the construction of the steel girder. The method can simplify the construction of the variable height steel girder, shortens the construction period and reduces the construction cost.

The invention relates to the technical field of passenger car security protection, in particular to a side wall vertical pillar structure which is capable of remarkably improving rollover security performance of a variable-cross-section passenger car. The side wall vertical pillar structure of the variable-cross-section passenger car is formed by an outside plate structure (6) and a U-shaped inner plate structure (7) in a welding mode, the width of the outside plate structure (6) from a top longitudinal beam (2) to a window waist beam (3) is the same, and from the window waist beam (3) to a lower waist beam (5), the width increases gradually from top to down. The cross-section size of the U-shaped inner plate structure (7) increases gradually along the vertical pillar length direction from top to bottom, the width of each cross-section of the U-shaped inner plate structure is (7) smaller than the cross-section width of the outside plate structure (6) at the same cross-section portion, a welding lap joint area with equal width is arranged on a joint of the U-shaped inner plate structure (7) and the outside plate structure (6). The side wall vertical pillar structure of the variable-cross-section passenger car is capable of guaranteeing that in the rollover process, the collision moment of the side wall vertical pillar of the passenger car body is matched with the pillar cross-section size, the degeneration of the side wall vertical pillar is enabled to become even, and the rollover security performance of the passenger car is improved. .