Large-span double-T plate hoisting construction method for fabricated prestressed structure industrial factory building roof

Abstract

The invention relates to the field of fabricated prestressed structure industrial factory building construction, in particular to a large-span double-T plate hoisting construction method for a fabricated prestressed structure industrial factory building roof. Comprising the following steps of column top elevation measurement and correction, double-T plate hoisting, temporary welding and fixing of double-T plate webs and embedded parts, welding and fixing of abutted seam connecting pieces between the double-T plates, seam pouring between the double-T plates, permanent fixing of one ends of the double-T plates, C30 concrete cast-in-place belts, construction through a roof building method, and welding and permanent fixing of angle steel on the hinged sides of the double-T plates. And the safety coefficient for mounting the large-span double-T plate (roof plate) is high, and the hoisting site is neat. The prestressed concrete double-T plate has the characteristics of block manufacturing and overall stress, the final stress of the plate is a multi-span continuous plate, the defect of poor overall performance of a common component is overcome, and the prestressed concrete double-T plate has excellent stress performance.

Description

Technical Field

[0001] The invention relates to the field of construction of prefabricated industrial plants, and in particular to a method for hoisting and constructing large-span double T-plates on the roof of a prefabricated industrial plant. Background Art

[0002] Conventional roofs are cast-in-place concrete structures, but cast-in-place structures have a long construction period and high requirements for the site, especially when constructing large areas and large spans. Safety issues in the erection of the frame often lead to frame instability and cast-in-place slab deflection, which can cause a series of quality and safety problems. Summary of the invention

[0003] The invention overcomes the deficiencies of the prior art and provides a method for hoisting and constructing a large-span double T-plate on a prefabricated industrial factory roof.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for hoisting and constructing a large-span double T-plate on a prefabricated prestressed structure industrial factory roof, comprising the following steps: (1) Preparation before double T-plate hoisting: check and calibrate the column top and beam top elevation, check and accept the double T-plate on site, and bring the crane into the site; (2) Hoisting of double T-board: Hang the hook, tie the rope, align the double T-board of the roof with the positioning line, and drop it to the designated position; (3) After the double T-plate is hoisted into place, the embedded parts at the bottom of the web on one side of the double T-plate and the embedded parts of the steel plate at the concrete beam and column are temporarily spot welded and fixed, and the other side of the web of the double T-plate is fixed with bolts; (4) The joints between the double T-plates are welded and fixed; the upper part of the double T-plate is fixed by joints; (5) Fill the gaps between the double T-plates; use C20 fine stone concrete to fill the gaps between the double T-plates and between the double T-plates and the parapet; (6) One end of the double T-plate is permanently fixed; the other end is welded on three sides; (7) Construction of C30 cast-in-place concrete strips; Construction of cast-in-place slab strips for the roof bonding layer. C30 concrete is used for pouring concrete for the bonding layer. When pouring the cast-in-place slab strips, steel mesh is arranged on the upper part. Two adjacent steel meshes are tied and connected by binding wires. The end is rebar-embedded on the side of the parapet by post-embedded reinforcement, and the steel mesh is connected and fixed to the parapet. Then, formworks on both sides are set up and concrete is poured. (8) Roof construction: The roof construction method is to construct the insulation layer in sequence, lay the extruded polystyrene board insulation layer on the roof, then pour the C20 fine stone concrete leveling layer, then construct 2 layers of SBS waterproof membrane, and finally pour the C20 fine stone concrete protective layer; (9) The double T-plate is hinged on one side and the angle steel is welded to be permanently fixed; after the construction of the building roof is completed, wait for 14 days, then use welding method to permanently fix the web of the double T-plate to the embedded part at one end, and weld the other end of the hinged angle steel to the embedded part to be permanently fixed.

[0005] As a further limitation of the technical solution of the present invention, in step (2), the roof double T-plate is first lifted 200 mm from the ground, kept still for one minute, and the road surface condition under the crane and the stable lifting condition are observed. Then the crane is rotated and the hook is slowly raised. When the lifting height exceeds the ring beam in place by 200 mm, it is aligned with the positioning line and slowly lowered to the specified position.

[0006] As a further limitation of the technical solution of the present invention, in step (3), the embedded steel plate on the concrete beam has a size of 250x250x12mm thick steel plate, and the bottom of the double T-plate web adopts a 120x120x10mm thick steel plate. After the bottom steel plate of the double T-plate web is butt-jointed with the embedded part on the concrete beam, it is temporarily spot-welded and fixed by arc welding.

[0007] As a further limitation of the technical solution of the present invention, the specific steps of fixing the other side of the web of the double T plate with bolts are as follows: first, fix the angle steel L110x10 on one side of the web bottom by welding, and then weld the angle steel L110x10 on the other side; after welding, two perforations are provided at a position 50mm above the bottom of the web, with a hole diameter of 20mm. Use 18mm high-strength bolts to pass through the perforations of the web from the angle steel position on one side of the web, and fix the other side with double nuts.

[0008] As a further limitation of the technical solution of the present invention, in step (4), the top wing plate of the double T plate is connected and fixed by welding an 8 mm thick steel plate to the double T plate wing plate embedded parts, the steel plate is 220 mm long and 80 mm wide, the steel plate is folded into a wing shape, the middle angle height is 50 mm, and the length of the horizontal plates on both sides is 80 mm.

[0009] As a further limitation of the technical solution of the present invention, in step (5), when grouting, a multi-layer board is used at the bottom for hanging formwork construction, and a 12# iron wire is used at the top to tighten and fix the hanging formwork with the multi-layer board, and then C20 fine stone concrete is used for grouting.

[0010] As a further limitation of the technical solution of the present invention, in step (7), the steel mesh is 6 mm in diameter and 100 x 100 mm in size; and No. 22 binding wire is used to bind and connect two adjacent steel meshes.

[0011] As a further limitation of the technical solution of the present invention, in step (8), the thickness of the extruded polystyrene board insulation layer is 65 mm, and the thickness of the SBS waterproof membrane is 3 mm.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The safety factor of installing a large-span double T-plate (roof plate) is also high, and the hoisting site is clean. The prestressed concrete double T-plate has the characteristics of block production and overall force bearing. The final plate is subjected to force as a multi-span continuous plate, which overcomes the defect of poor overall performance of general components and has excellent force bearing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a flow chart of the construction method of the present invention.

[0014] Figure 2 This is a schematic diagram of the double T-board roof plan layout.

[0015] Figure 3 Schematic diagram of the patchwork structure.

[0016] Figure 4 for Figure 3 Side view of.

[0017] The following are marked in the figure: 1-Double T-plate embedded parts, 2-8mm thick steel plate, 3-C20 fine stone concrete grouting. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with specific embodiments. Example

[0019] After the crane beam is hoisted and permanently welded in place, the double T-plates for the roof are installed.

[0020] Double T-plate installation process: Column top elevation measurement and correction → Double T-plate hoisting → Temporary welding and fixing of double T-plate web and embedded parts → Welding and fixing of joint connectors between double T-plates → Filling of joints between double T-plates → Permanent fixation of one end of double T-plate → C30 cast-in-place concrete strip → Construction of roof construction method → ​​Permanent fixation of angle steel on one side of hinged double T-plate by welding.

[0021] (1) Double T-plate hoisting According to the weight of the double T-plate and the site conditions, a 150-ton crawler crane was used for lifting. According to the crawler crane lifting parameter performance table, when the 150-ton crawler crane has a 37-meter-long boom, the lifting capacity is 43.6 tons at a radius of 14 meters.

[0022] The double T-plate weighs 23 tons, the hook weighs 1 ton, the wire rope weighs 0.6 tons, and the 150-ton crawler crane meets the double T-plate lifting requirements.

[0023] Preparation before lifting the double T-plate: After the on-site inspection is qualified, the stacking and driving routes are determined, the axis, flatness, and elevation of the embedded plates and embedded bolts are checked, and after the inspection and measurement are qualified. The T-plates are transported to the installation location according to the number and placed in the center of the column foot according to the regulations to form a concentric arc with the center of the basic surface. Before lifting the T-plate, check again whether the various reference points, center lines, lifting (binding) points and surfaces of the T-plate are damaged and dirty. After confirmation, start bundling and lifting. Before lifting the T-plate, the surface of the contact point of the falling plate should be cleaned first. Before lifting, check the strength of the wire rope and lifting equipment and check for defects and safety hazards.

[0024] Before ground assembly, check the T-board. If the deformation or defect of the T-board exceeds the allowable deviation, it must be processed. Also check the friction surface of the installation connection. There must be no debris such as mud and sand. The friction surface must be flat and dry. Do not work in the rain. When assembling on the ground, use oil-free sleepers to pad the components, and support the components on both sides with wooden bars to enhance stability. Before assembly, form an assembly platform with at least 4 support points. Place the T-boards on the platform and assemble them according to the drawing numbers. By analogy, assemble all the rows, and then check the hanging points, alignment benchmarks and center lines.

[0025] (2) During lifting, hang the hook, tie the slip rope, lift the roof double T-plate 200mm from the ground, keep it still for one minute, observe the road conditions under the crane and the stability of the lifting, then turn the crane back, slowly lift the hook, wait until the lifting height exceeds the ring beam in place by 200mm, align it with the positioning line, slowly lower it to the designated position, and after checking that everything is correct, temporarily weld the web of the double T-plate to the embedded parts and fix them.

[0026] Hook tying → lifting → alignment → temporary fixation → correction → final fixation Adjust the position and debug well. Align the bottom surface of the T-board with the cross center line of the embedded plate and then slowly lower it. After the T-board is lifted above the bolt, the operators stand in their respective positions, stabilize the reserved holes on the T-board, align them with the bolts and insert them. When the T-board is lowered to the adjustment nut, stop falling into the ditch, pry the T-board with a pry, align its center line with the center line of the embedded plate, and tighten the connecting nut. The hook can be removed only when it is safe. For unstable T-boards, temporary wind cable protection measures must be added. Before lifting, the hoisting team must have a clear division of labor, and complete measuring, hoisting and fastening equipment. The crane, command, measurement, alignment, binding and on-site construction quality and safety engineers must perform their duties, and try to minimize the number of idle people approaching.

[0027] (3) After the double T-plate is hoisted into place, during installation, the embedded parts at the bottom of the web on one side of the double T-plate and the embedded parts of the steel plate at the concrete beam-column position are temporarily spot welded and fixed. The embedded steel plate on the concrete beam is 250x250x12mm thick. The bottom of the web of the double T-plate is 120x120x10mm thick. After the steel plate at the bottom of the web of the double T-plate is butt-jointed with the embedded parts on the concrete beam, it is temporarily spot welded and fixed by arc welding.

[0028] The other side of the double T-plate web is fixed with bolts. After being hoisted into place, the bottom of the web is first fixed with welding. Fix the angle steel L110x10 on one side, and then weld the angle steel L110x10 on the other side; after welding, two perforations are set at 50mm above the bottom of the web, with a hole diameter of 20mm. Use 18mm high-strength bolts to pass through the web perforations from the angle steel position on one side of the web, and use double nuts to fix the other side.

[0029] (4) The upper part of the double T-plate is fixed by splicing.

[0030] The top wing plate of the double T plate is connected and fixed by welding 8mm thick steel plate and the embedded parts of the double T plate wing plate. The length of the steel plate is 220mm and the width is 80mm. The steel plate is folded into a wing shape with a middle angle height of 50mm and a horizontal plate length of 80mm on both sides.

[0031] J402 welding rods are used for welding, three-sided welding, and the weld quality level is second level. The double T-plate wing plate is 23m long, 3m wide, and 0.9m high. A connection position is set every 4.5m along the length of 23m. When pouring concrete on the wing plate, the steel embedded parts are embedded in advance. The embedded parts are 100x100x10mm thick steel plates, and the double T-plate wing plates are evenly embedded along the length direction. After the hoisting is completed, the connection plate is used for welding connection.

[0032] (5) Fill the gaps between the double T-plates.

[0033] The gaps between the double T-plates and between the double T-plates and the parapet are filled with C20 fine stone concrete. When filling the gaps, multi-layer boards are used for hanging formwork construction at the bottom, and 12# iron wire is used to tighten and fix the hanging formwork with multi-layer boards at the top. Then C20 fine stone concrete is used for filling the gaps.

[0034] (6) One end of the double T-plate is permanently fixed The consolidation end is welded on three sides. The weld leg size should not be less than 8mm, and the weld quality grade is grade three.

[0035] (7) Construction of C30 cast-in-place concrete strip After the connecting plate between the double T-plates on the roof is fixed, the gap is filled. The construction of the cast-in-place slab strip of the roof bonding layer begins, and C30 concrete is used for pouring concrete in the bonding layer. When pouring the cast-in-place slab strip, a steel mesh is arranged on the upper part. The steel mesh specification is a steel mesh with a diameter of 6mm and 100x100mm. No. 22 binding wire is used between the steel meshes to tie and connect two adjacent steel meshes. The end is post-embedded by planting 6mm@100x100mm on the side of the parapet to connect and fix the steel mesh to the parapet. Then the templates on both sides are supported and concrete is poured.

[0036] (8) Roofing construction Roof construction method, first construct the insulation layer, then lay the 65mm thick extruded polystyrene insulation layer on the roof, then pour the C20 fine stone concrete leveling layer. Then construct 2 layers of 3mm thick SBS waterproof membrane. Finally, pour the C20 fine stone concrete protective layer.

[0037] (9) Double T-plate hinged one side angle steel welded permanently fixed After the construction of the building roof is completed, wait for 14 days until the static load of the roof is basically stable. Then the double T-plate web is permanently welded to the embedded parts by welding. The other end is hinged to the angle steel and the embedded parts by welding.

Claims

1. A method for hoisting and constructing a large-span double T-plate on the roof of an assembled prestressed structure industrial factory, characterized in that: The following steps are involved: (1) Preparation before double T-plate hoisting: check and calibrate the column top and beam top elevation, check and accept the double T-plate on site, and bring the crane into the site; (2) Hoisting of double T-board: Hang the hook, tie the rope, align the double T-board of the roof with the positioning line, and drop it to the designated position; (3) After the double T-plate is hoisted into place, the embedded parts at the bottom of the web on one side of the double T-plate and the embedded parts of the steel plate at the concrete beam and column are temporarily spot welded and fixed, and the other side of the web of the double T-plate is fixed with bolts; (4) The joints between the double T-plates are welded and fixed; the upper part of the double T-plate is fixed by joints; (5) Fill the gaps between the double T-plates; use C20 fine stone concrete to fill the gaps between the double T-plates and between the double T-plates and the parapet; (6) One end of the double T-plate is permanently fixed; the other end is welded on three sides; (7) Construction of C30 cast-in-place concrete strips; Construction of cast-in-place slab strips for the roof bonding layer. C30 concrete is used for pouring concrete for the bonding layer. When pouring the cast-in-place slab strips, steel mesh is arranged on the upper part. Two adjacent steel meshes are tied and connected by binding wires. The end is rebar-embedded on the side of the parapet by post-embedded reinforcement, and the steel mesh is connected and fixed to the parapet. Then, formworks on both sides are set up and concrete is poured. (8) Roof construction: The roof construction method is to construct the insulation layer in sequence, lay the extruded polystyrene board insulation layer on the roof, then pour the C20 fine stone concrete leveling layer, then construct 2 layers of SBS waterproof membrane, and finally pour the C20 fine stone concrete protective layer; (9) The double T-plate is hinged on one side and the angle steel is welded to be permanently fixed; after the construction of the building roof is completed, wait for 14 days, then use welding method to permanently fix the web of the double T-plate to the embedded part at one end, and weld the other end of the hinged angle steel to the embedded part to be permanently fixed.

2. The method for hoisting and constructing a large-span double T-plate on the roof of an assembled prestressed structure industrial factory building according to claim 1 is characterized in that: In step (2), the roof double T-plate is first lifted 200mm from the ground, and kept still for one minute to observe the road conditions under the crane and the stability of the lifting. Then the crane is turned back and the hook is slowly raised. When the lifting height exceeds the ring beam by 200mm, it is aligned with the positioning line and slowly lowered to the specified position.

3. The method for hoisting and constructing a large-span double T-plate on the roof of an assembled prestressed structure industrial factory building according to claim 1 is characterized in that: Step (3) The embedded steel plate on the concrete beam has a size of 250x250x12mm thick steel plate, and the bottom of the double T-plate web uses a 120x120x10mm thick steel plate. After the bottom steel plate of the double T-plate web is butted in place with the embedded parts on the concrete beam, it is temporarily spot-welded and fixed by arc welding.

4. The method for hoisting and constructing a large-span double T-plate on the roof of an assembled prestressed structure industrial factory building according to claim 1 is characterized in that: The specific steps of bolting the other side of the double T-plate web are as follows: first weld and fix the angle steel L110x10 on one side of the web bottom, and then weld the angle steel L110x10 on the other side; after welding, two perforations are set 50mm above the bottom of the web, with a hole diameter of 20mm. Use 18mm high-strength bolts to pass through the perforations of the web from the angle steel position on one side of the web, and fix the other side with double nuts.

5. The method for hoisting and constructing a large-span double T-plate on the roof of an assembled prestressed structure industrial factory building according to claim 1 is characterized in that: Step (4) The top wing plate of the double T-plate is connected and fixed by welding an 8mm thick steel plate to the embedded parts of the double T-plate wing plate. The steel plate is 220mm long and 80m wide. The steel plate is folded into a wing shape with a middle angle height of 50mm and a horizontal plate length of 80mm on both sides.

6. The method for hoisting and constructing a large-span double T-plate on the roof of an assembled prestressed structure industrial factory building according to claim 1 is characterized in that: Step (5) When grouting, multi-layer boards are used for the bottom formwork construction, and 12# iron wire is used to tighten and fix the hanging formwork with the multi-layer boards on the top, and then C20 fine stone concrete is used for grouting.

7. The method for hoisting and constructing a large-span double T-plate on the roof of an assembled prestressed structure industrial factory building according to claim 1 is characterized in that: Step (7) The steel mesh is 6 mm in diameter and 100 x 100 mm in size. No. 22 binding wire is used to tie and connect two adjacent steel meshes.

8. The method for hoisting and constructing a large-span double T-plate on the roof of an assembled prestressed structure industrial factory building according to claim 1 is characterized in that: In step (8), the thickness of the extruded polystyrene board insulation layer is 65 mm, and the thickness of the SBS waterproof membrane is 3 mm.

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