33results about How to "Avoid lateral instability" patented technology

The invention discloses a hydraulic single-cylinder tension device. The hydraulic single-cylinder tension device comprises a base, a connecting rod, a cylinder body, a piston, a support base, a top screw nut, a bottom screw nut and an anchor rod, wherein the base penetrates through the anchor rod and is arranged on surrounding rock; the upper end of the base is provided with a flange; the bottom part of the cylinder body is connected with the base through the flange in a matching way; the piston is arranged in the cylinder body; a cavity is formed between the piston and the cylinder body; the cylinder body is provided with an oil inlet, the piston is provided with an oil outlet, and the oil inlet and the oil outlet are respectively communicated with the cavity; the bottom screw nut is arranged on the anchor rod, the tail part of the anchor rod is fixedly connected with one end of the connecting rod, the other end of the connecting rod is fixedly connected with the support base, and the support base is positioned at the upper end of the piston; the connecting rod is tightened by the top screw nut. The hydraulic single-cylinder tension device has the advantages that the tension device is suitable for the quick tension of the anchor rods with different exposing lengths in the narrow operation space, the working efficiency is improved, the tension requirement of the anchor rod is decreased, and the transverse instability of the hydraulic double-cylinder tension device is avoided.

The invention discloses a large-scale (continuous) beam-type structure on-site load simulation experiment detection device and detection method. The detection device includes a structural beam arranged parallel to the detection engineering beam. There is a force transmission and detection device between the structural beam and the detection engineering beam. Both ends of the structural beam and the detection engineering beam are connected by wire ropes. The structural beam, detection engineering beam, force transmission, detection device and steel wire rope are composed to realize the simulated load. structural system. After adopting such a mechanism, it is possible to carry out on-site load experiment, detection and inspection of large-scale beam structure engineering. The pulley fixing devices at both ends can meet the requirements of carrying large loads and super large loads. The uniform force and concentrated force can be correctly simulated by adding pad beams and small pads. Lateral instability, the overall equipment structure is simple, which can meet the design and use requirements.

The invention discloses a function integrated air spring which comprises an upper cover plate, an air bag, an upper end plate and a lower end plate. An auxiliary spring is connected between the upperend plate and the lower end plate, the periphery of the upper cover plate is connected with the outer periphery of the upper end plate or the outer periphery of the auxiliary spring through the air bag, and a vertical oil pressure shock absorber mounting base, a transverse oil pressure shock absorber mounting base and a transverse rubber soft stop plate are integrally arranged on the peripheral edge of the upper cover plate; a plurality of mounting holes for fixing a vehicle body are further formed in the top surface of the upper cover plate. The air spring has the advantages that the rigidityis adjustable, the application range is wide, and the overall structure and layout are optimized.

The present application discloses a parallel-chord wooden truss and a manufacturing method thereof. The parallel-chord wooden truss includes: an upper chord, the upper chord includes a piece of laminated veneer lumber, and the width of the laminated veneer lumber is 2 times its thickness times, the thickness direction of the LVL is parallel to the height direction of the upper chord; the lower chord is parallel to the upper chord, the lower chord includes two pieces of the LVL, and the two pieces The thickness direction of the laminated veneer lumber is perpendicular to the height direction of the upper chord; the straight web is perpendicular to the upper chord, and the two ends of the straight web are respectively connected to the upper chord and the lower chord; A diagonal-web rod having a predetermined angle with the straight-web rod, and two ends of the diagonal-web rod are respectively connected with the upper chord and the lower chord. The parallel-chord wooden truss provided by this application can meet the rigidity requirements, ensure that the deflection and vibration frequency of the floor with the parallel-chord wooden truss are in the vibration insensitive area, and solve the problem of poor floor vibration comfort.

The invention belongs to the field of bridge construction processes, is applied in the construction of a movable shuttering form for a cast-in-place box girder, and particularly relates to a construction process for the overhead back-up movement and dismantlement of a movable shuttering form after a cast-in-place box girder is completely constructed by the movable shuttering form. The process is characterized in that: a back guide girder, a main beam, a front guide girder, a bracket, a cart, an external mould plate, a mould plate beam, a middle beam and bracket tensioning fining twisted steelon both sides of the bride need to be removed; the cart transversely moves on the bracket to open the movable shuttering form, a winder is arranged on a concrete box girder, the external mould plate is removed by the winder and by the drawing and hoisting operation of a truck crane, the mould plate beam and the middle beam are removed from the top to the bottom in sequence, only the back guide girder, the main beam and the front guide girder remain, the main beam of the movable shuttering form is removed, and finally the last section of main beam and the front guide girder are moved. The process has the advantages of speeding up the construction, reducing construction equipment, guaranteeing the construction safety and lowering construction cost.

The invention discloses an energy absorption device based on necking plastic deformation. The energy absorption device comprises a mounting plate provided with mounting through holes. A necking concave die is arranged in each mounting through hole of the mounting plate. A necking through hole is formed in the middle of each necking concave die. A necking deformation pipe is embedded in each necking through hole in a cooperation manner. An impact convex die is inserted in the necking deformation pipes. One end of the impact convex die is located outside the large-diameter pipe ends of the necking deformation pipes, the other end of the impact convex die is in contact with a bottom plate arranged at the small-diameter pipe end of each necking deformation pipe, and the small-diameter pipe ends are inserted into the necking through holes of the necking concave dies. Each necking deformation pipe is a thin-wall metal pipe, and the strength of the necking deformation pipes is smaller than that of the impact convex die and that of the necking concave dies. The impact convex die can transmit impact force to the bottom plates of the necking deformation pipes, so that the necking deformation pipes are converted to be pulled from being pressed to generate stable plastic deformation so as to absorb energy. The energy absorption device further has the beneficial effects of being simple in structure, convenient to mount, capable of bearing stronger impact force, capable of avoiding transverse unstability and stable in deformation, saving cost and the like.

The invention belongs to the technical field of steel structure buildings, and particularly relates to a funnel type sand box unloading device and method which are used for unloading temporary supporting frames of bearing steel components. Four bolts in a horizontal release part need to be unscrewed before unloading is started, and horizontal displacement of the steel components in the unloading process is effectively released through sliding between a stainless steel plate and a slide plate. The unloading device is novel in concept, can conveniently unload the temporary supporting frames of the steel structure, and has the advantages of being good in sealing performance, capable of releasing horizontal displacement of supporting points, convenient to operate, high in safety, and the like.

The invention relates to the technical field of arrangement of steel structure roof support, and discloses a built-up connection structure and a built-up connection method for roof support and I-steel purlins. The built-up connection structure is provided with a plurality of steel roof truss structures and a plurality of roof support structures which are connected into a net-shaped connection structure. Each steel roof truss structure comprises a steel roof truss upper chord and a purlin which are perpendicularly connected in a cross mode. Four corners of the panel point where each purlin is connected with each steel roof truss upper chord are connected with a roof support rod in an inclined mode through a structural steel piece and a connecting plate. Each roof support structure comprises a connecting beam and a purlin which are perpendicularly connected in an overlapped mode. Four corners of the panel point where each purlin is connected with each connecting beam are connected with the roof support structure in an inclined mode through a connecting plate. According to the built-up connection structure and the built-up connection method for the roof support and the I-steel purlins, the purlins can concurrently serve as pressure levers so as to prevent the roof upper chords from being unstable along the side direction. Meanwhile, the purlins and the connecting beams can further and concurrently serve as tie bars of the roof support. The area of the roof support is divided into sizes with good economical efficiency and applicability. The built-up connection structure is convenient to arrange, simple in structure, easy to machine and low in manufacture and machining cost.