40results about How to "Guaranteed structural size" patented technology

The invention relates to a suspended formwork for concrete foundation steps and a suspended formwork pouring method for pouring concrete foundation steps by using the suspended formwork. The suspended formwork comprises one or a plurality of formwork racks, each formwork rack comprises at least one longitudinal beam and a plurality of structural units distributed along the longitudinal beams in turn, each structural unit comprises a vertical formwork rack for mounting a vertical formwork and an inclined strengthening rib for fixing the vertical formwork rack, one end of the vertical formwork rack is fixedly connected with the longitudinal beam, and the two ends of the inclined strengthening rib are fixedly connected with the longitudinal beam and the vertical formwork rack respectively to form a steady triangular structure. The method comprises the following steps: (1) leveling up and tamping a foundation; (2) mounting a suspended formwork; and (3) pouring concrete foundation steps by use of the suspended formwork fabricated in step (2). The suspended formwork provided by the invention has the advantages of simple structure, accurate positioning and easiness in operation, and can be repeatedly used. The steps constructed using the method provided by the invention have the advantages of regular structure, esthetic appearance, high strength, and greatly improved quality.

The invention relates to a frame-type car body rear compartment structure and a welding method. The structure comprises a first side assembly at the rear portion of a car body, a second side assemblyat the rear portion of the car body, a first cross beam assembly at the rear portion, a second cross beam assembly at the rear portion, a battery box frame fixing assisting beam, a storage battery cross beam and a process beam, wherein the process beam is mounted between the bottom of the first side assembly at the rear portion of the car body and the bottom of the second side assembly at the rearportion of the car body. According to the structure and the welding method, the welding quality of a rear compartment of the car body and a welding process for welding deformation can be effectivelycontrolled, the repair quantity and size adjustment of welding seams are reduced, the welding seam quality and structural size of the rear compartment of the car body are ensured, the production efficiency is improved, and the qualification rate of products is increased.

The invention provides a mechanical demolding device for a steel core mold of a prefabricated hollow slab beam, and relates to the technical field of highway engineering. The mechanical demolding device comprises a support frame, a first base, a first expansion device, a first limiting rope and a first limiting rod, wherein the first base is connected with the support frame in a sliding manner and is also fixedly connected with a sheet steel form; the first expansion device is provided with a first shell and a first movable rod, the first shell is fixedly connected with the first base, and the first movable rod is fixedly connected with another sheet steel form; the two ends of the first limiting rope are fixedly connected with another sheet steel form and the support frame respectively; and the first limiting rod is fixedly connected with the support frame and can abut against another sheet steel form. The mechanical demolding device has the advantages that the support frame is placed at the hollow position of the prefabricated hollow slab beam, the sheet steel forms are automatically installed and demolded through the expansion devices, the support frame is directly drawn after demolding, each expansion device correspondingly controls the movement of the two sheet steel forms, and the sheet steel forms are conveniently installed and dismantled.

The invention relates to cast-in-place kerbstone for reserved replacement of an asphalt concrete pavement. The cast-in-place kerbstone comprises a reserved groove mold, a gravel dense screen bag, a lightweight rib separating block, a cast-in-place slip form system, the cast-in-place kerbstone and the asphalt concrete pavement. A cement stabilized macadam foundation is arranged on a subbase course,wherein a kerbstone indwelled groove is excavated on the cement stabilized macadam foundation by a separator kerbstone mould; in addition, a indwelled groove mold is arranged in the kerbstone indwelled groove; the lightweight rib separating block and the gravel dense screen bag are arranged in the indwelled groove mold; the cement stabilized macadam foundation is sequentially provided with a coarse-grained asphalt concrete layer and a fine-grained asphalt concrete layer from bottom to top. According to the cast-in-place kerbstone for the reserved replacement of the asphalt concrete pavement,disclosed by the invention, by adopting slip-form construction for the kerbstone, the construction method has the advantages of high construction speed, less required labor and no prefabricated site;the paved kerbstone has high integral structural strength and smooth and beautiful linetype.

The invention relates to an easy-to-dismantle deformation joint form erecting method which comprises the following steps: (1) mounting first wood glue plates which are 1 to 12mm thick on the two sides of a deformation joint respectively; (2) laying a first batten which is 50mm thick at the bottom of the deformation joint; (3) sequentially placing scaffold tubes in the deformation joint until the distance between the scaffold tubes and the upper surface is smaller than 100mm; (4) arranging a second batten above the scaffold tubes. The easy-to-dismantle deformation joint form erecting method has the beneficial effects that (1) easiness for dismantling is achieved; (2) such a combination is stiff enough, and the structural dimensions on the two sides of the deformation joints can be ensured; (3) the adopted materials are common for construction, and can be recycled; (4) the two sides of the deformation joints are simultaneously constructed, so that the construction speed is increased.

The invention relates to a reinforcing device for tenon-mortise structures of a cylindrical template and a use method thereof, and belongs to the field of construction devices and methods of reinforced concrete columns. The reinforcing device for the tenon-mortise structures of the cylindrical template is characterized by including main back bars, the main back bars made from wood are arranged onthe peripheral surface of the template from bottom to top, main back bars are segmented ring bodies connected in a mortise and tenon joint mode, each main back bar include back bar sections, each backbar section includes a back bar body, a mortise and a tenon, the mortises are formed in the right side faces of the back bar bodies, the tenons are arranged on the left side faces of the back bar bodies, and transition fit between the mortises and the tenons is achieved. The use method of the reinforcing device is characterized in that the annular main back bars are used for making the inner surfaces of the main back bars tightly attached to the template, and the template is reinforced by occlusion force of the tenon-mortise structures of the back bar sections. The use method includes the following steps of 1, preparation work, 2, preparation of the main back bars and 3, field installation. The device is safe and reliable to use, and the construction efficiency and the construction quality are improved.

The invention discloses a railroad business line box bridge extension construction method. The railroad business line box bridge extension construction method comprises the steps of 1, arrangement ofdrilling points and drilling; 2, expansion slurry injection; 3, removal of concrete on the inner side of a flare wing wall; 4, extension of a railroad business line box bridge. In the method, part ofthe flare wing wall of the box bridge is removed, the remaining part of the flare wing wall has a supporting effect on a roadbed behind the flare wing wall, the basic concrete structure of the flare wing wall can serve as the basis of a box bridge body which is about to be extended later, the construction period is short, the construction quality is ensured, the problem about the safety and protection of a business line is solved, the protection engineering quantity is greatly reduced, and the protection construction process is simplified.

The invention relates to the technical field of civil engineering, in particular to a form board fastening device for facilitating control on a large-thickness concrete protecting layer. The form board fastening device for facilitating control on the large-thickness concrete protecting layer comprises an inner opposite-pull rod, an outer opposite-pull rod, a circular-truncated-cone-shaped nut and a disc-shaped nut, wherein the outer opposite-pull rod penetrates in a form board and is detachably connected with the inner opposite-pull rod through the circular-truncated-cone-shaped nut; and the length of the circular-truncated-cone-shaped nut is matched with the thickness of the concrete protecting layer so that thicknesses of different concrete protecting layers can be controlled effectively. When the form board is detached, the circular-truncated-cone-shaped nut is detached, a hole in the location of the circular-truncated-cone-shaped is chiseled and is filled with epoxy mortar, the inner opposite-pull rod does not need to be taken out, defects on the quality of concrete due to drawbacks of the traditional technology are greatly avoided, according to the structure with the inner opposite-pull rod, the outer opposite-pull rod and the circular-truncated-cone-shaped nut, the opposite-pull rods can be customized according to the thickness of thickness of a wall body, the mounting position of the form board can be limited well by the combination of the opposite-pull rods, and the structural size can be guaranteed.

The invention provides a self-assembling movable template for a partition wall in a main structure of a subway station and a half-cover excavation method section. A base is formed by welding channel steel, two first channel steel are arranged at parallel intervals in the length direction, a plurality of second channel steel are arranged at parallel intervals in the width direction, and the spacingbetween the two first channel steel is the same as the spacing between two adjacent second channel steel; both ends of the second channel steel are separately welded and fixed to the first channel steel; a bracket is erected with a plurality of steel pipes, the horizontal spacing is 1m, and the step spacing is 1.2m, so that a double-row scaffold is formed; the steel pipes which are erected in thevertical direction are used as vertical rods, the bottoms of the steel pipes are welded and fixed to the base, and other steel pipes are connected at crossing nodes by fasteners; the steel pipes erected in the horizontal direction are horizontal rods, the two ends of the steel pipes extend out of the bracket and are used for being fixed to transverse rib steel pipes of a panel to bear the weightof the panel; and the panel is a blockboard, and transverse ribs and vertical ribs are bound and fixed by iron wires.

The invention discloses a production method of a non-developable surface structure of a large bridge steel tower. The method comprises the following steps of: constructing a simplified model of straight line instead of curve according to a curved surface structure by using Solidworks software, preparing a solid body, unfolding the solid body and drawing a curved surface flattening picture; pre-processing a board, blanking, marking out and digging according to the curved surface flattening picture, bending a bending line, detecting a sample plate, and carrying out flame finishing to obtain a split two-dimensional space curved surface; pre-processing the board, blanking, marking out and digging according to a curved surface flattening picture, bending a bending line, detecting a sample plate, carrying out flame finishing, dividing and marking out to carry out multiple divisions, weighting and matching in the field, cutting, assembling and welding to obtain a three-dimensional space curved surface; assembling and welding the split two-dimensional space curved surface and/or the three-dimensional space curved surface in the field, detecting flaw, and coping a welding line. The method provided by the invention is convenient and feasible, the production precise conforms to the design requirements and is simple to operate, hot rolling and a special mould are not adopted, the investment cost is low, and the change and the influence on the mechanical property of a steel material are avoided.

The invention discloses an arc-shaped wall plastering method. The arc-shaped wall plastering method comprises the following steps of establishing a set of coordinate system according to the plasteringthickness on the basis of coordinate points on the outer side of an arc-shaped structure on a drawing, and enabling the two sets of coordinate systems to be located in the same center of a circle; lofting an arc-shaped positioning point on the ground outside a wall by a total station; leading a series of ash cake points which are distributed at intervals upwards on the wall from the ground arc-shaped positioning point by a laser level meter; and finally, detecting whether the thickest points of any two vertical ash cakes are located on the same vertical plane or not by a horizontal ruler. Byadopting the arc-shaped wall plastering method, the plastering quality can be guaranteed, the smoothness of the whole large surface is guaranteed, and the structural size can be guaranteed.

The invention relates to a large composite material product forming die which comprises a die body (1), a connecting block (2), a correcting rod (3) and a punching tool rod (4). The mold main body (1) is of a regular annular structure; the multiple connecting blocks (2) are arranged at intervals in the circumferential direction of the mold body (1), and the connecting blocks (2) are located on the inner side of the mold body (1); a plurality of correcting rods (3) are arranged on the same side of the mold main body (1) at intervals; wherein two opposite ends of the correcting rod (3) are respectively connected with the mold main body (1); the punching tool rod (4) is perpendicular to the correcting rod (3), and the punching tool rod (4) and the correcting rod (3) are located on the same side of the die body (1); wherein two opposite ends of the punching tool rod (4) are respectively connected with the die main body (1).

The invention discloses a welding plant for section-variable aluminum alloy long pipe fittings. The welding plant comprises a rotary welding plant and an automatic welding tractor. The automatic welding tractor is provided with a full-automatic welding handle. The rotary welding plant comprises a base and a rotary frame, upright frames are respectively arranged at two ends of the base, two ends of the rotary frame are respectively mounted on the upright frames at the two ends of the base by hollow shafts, and workpiece clamping devices are respectively arranged on two sides of the rotary frame; rails are disposed on one side of the rotary welding plant, the automatic welding tractor is arranged on the guide rails, and a radial adjusting mechanism is arranged between the full-automatic welding handle and the automatic welding tractor; and elastic barriers are respectively arranged on the hollow shafts at two ends of the rotary frame. The welding plant has the advantages that the quality of products is improved under the condition without high-end welding equipment such as welding robots and special welding machines, the production efficiency is improved, and the repair rate and the rejection rate are reduced.