CN103147582A - Overhead cantilever formwork construction method - Google Patents

Abstract

The invention discloses an overhead cantilever formwork construction method, which is characterized in that H steel sections and triangle ties are used for fabricating triangular trusses which are used for forming a cantilever platform at an n-2 layer, formwork supports at an n layer are erected, a cantilever formwork system is independent of formwork supporting systems at the n-2 layer and an n-1 layer, and the installation and the removal of formworks and the formwork supporting systems at the n-2 layer and the n-1 layer are not influenced; a cantilever structure is of a triangular truss steel platform structure and is mainly based on lower supports; and a steel platform is formed by eleven triangle trusses through connection to finally form an integral platform, and a construction platform for an upper cantilever structure and a formwork supporting platform are provided. The overhead cantilever formwork construction method has the advantages of convenience and simplicity in construction, easiness in operation, high safety and good effect.

Description

The job practices of high-altitude overhanging mould bases

Technical field

The present invention relates to a kind of job practices of high-altitude overhanging mould bases.

Background technology

Job site large cantilevered structure construction has certain difficulty, especially highrise building, and when adopting fastener type steel pipe scaffold to set up suspended structural support can not to satisfy structural element precision and constructing operation safety requirements, its difficulty is particularly outstanding.

Summary of the invention

The object of the present invention is to provide the job practices of a kind of easy construction, safe, effective high-altitude overhanging mould bases.

Technical solution of the present invention is:

A kind of job practices of high-altitude overhanging mould bases, it is characterized in that: select H shaped steel and trivet make to form triangular truss at the n-2 layer as outrigger platform, set up the falsework of n layer, encorbelment formwork system and n-2 layer, n-1 layer form bracing system is separate, does not affect installation and the dismounting of n-2 layer, n-1 layer template and form bracing system; Cantilevered structure adopts English truss formula structure of steel platform, is supported for the master with the bottom; The steel platform by connecting to form, finally forms an integral platform by 11 Pin English trusses, and operation platform and the formwork support platform of top cantilevered structure is provided; Concrete operation step comprises:

(1) structure is pre-buried

(1) at the n-3 layer structure pre-buried iron plate 300*200*12 in the outside, as the bottom fulcrum of English truss, spacing is with the spacing of English truss;

(2) pre-buried suspension ring and bolt M20 on n-2 layer structure flooring, vertically arrange three roads; Suspension ring adopt the HPB235 grade reinforcing steel, imbed concrete beam 〉=30d, and welding or colligation be on cage of reinforcement, and spacing is with the spacing of English truss;

(3) the pre-buried indwelling suspension ring in the n-1 layer Vierendeel girder outside, the spacing of suspension ring is with the spacing of triangular truss; Suspension ring adopt the HPB235 grade reinforcing steel, imbed concrete beam 〉=30d, and welding or colligation adopt two ф 20 suspension ring on cage of reinforcement, imbed concrete beam 600;

(2) outrigger platform structure

(1) according to design drawing, the H shaped steel 390*300*10*16 of the use of encorbelmenting, long 12m, three place's tie point eyelets have bored in producer at professional steel work, and 4/locate, the eyelet specification is Φ 18, is transported to adopt 50T vapour to hang behind the building site to winch to field position;

(2) H shaped steel English truss is comprised of trivet and H shaped steel, and trivet is comprised of vertical 10# double flute steel, oblique 10# double flute steel, horizontal 10# double flute steel; The double flute steel adopts the 10# channel-section steel to be welded to connect, weld seam 10mm; 3 tie point end full weld welding 250*210*12 iron plates of trivet, weld seam 10mm; According to design drawing, bored the eyelet of Φ 18, be complementary with eyelet on H shaped steel, be transported to the building site after being made by professional steel work producer;

(3) trivet and H shaped steel carry out assembly unit, adopt 12 M16 bolts to be connected between trivet and H shaped steel, by professional steel work personnel, bolt are carried out the moment of torsion detection, carry out the assembly unit of the 2nd Pin English truss after qualified;

(4) adopt a 200T vapour to lift up into the field and carry out the English truss lifting, a Pin English truss lifting connects fasteningly to pre-buried bolt position with the M20 bolt, carry out the lifting of the 2nd Pin English truss after qualified after testing;

(5) install after English truss net support 200T vapour hangs hoisted in position, between English truss, two 10# double flute steel diagonal welding are adopted in the horizontal net support, adopt two 10# double flute steel diagonal welding between the lower chord of English truss, adopt two 10# double flute steel diagonal welding between the montant of English truss, form whole load system;

(6) treat that between English truss, end is all installed in the net support, the triangular truss of choosing from n-2 floor face is as the platform girder, in the English truss outermost, namely under outer suspended scaffold upright rod load, weld 2 10# i iron, Φ 20 steel bar ends of welding 100mm length are spacing as the vertical rod of builder's jack on the 10# i iron;

(7) completely spread the 50mm plank between English truss, according to design drawing, welded 2 first quarter moon iron plates by the constructor on H shaped steel, R=100mm, on every H shaped steel, the anti-suspension ring drawknot that draws four road Φ 18.5*9 wire rope and 18 layers, as safety stock, ignore its effect in calculation diagram;

(8) according to template framed bent distribution map, Φ 20 steel bar ends of welding 100mm length are spacing as vertical rod on H shaped steel;

(9) outrigger platform completely spreads the thick plank of 50mm, the splicing that misplaces between plank, and piece is tight, as security protection;

(10) scaffold upright rod is fixed after being inserted in the limit steel bar head, sets up formwork-support after tying up the bar of sweeping the floor, and vertical pole ' s span conforms to designing requirement, goes on foot high 1500mm;

Formed a load outrigger platform in total from the bottom that the n-2 layer is chosen part like this, can set up steel tube frame and support n layer stay in place formwork on outrigger platform.

Easy construction of the present invention, simple, easy to operate, safety is good, effective.

The invention will be further described below in conjunction with embodiment.

The specific embodiment

A kind of job practices of high-altitude overhanging mould bases, select H shaped steel and trivet make to form triangular truss at n-2(take n=19 as example, n-2 is 17 layers) layer as outrigger platform, set up the falsework of 19 layers, encorbelment formwork system and 17 layers, 18 layers form bracing system are separate, do not affect installation and the dismounting of 17 layers, 18 layers template and form bracing system; Cantilevered structure adopts English truss formula structure of steel platform, is supported for the master with the bottom; The steel platform by connecting to form, finally forms an integral platform by 11 Pin English trusses, and operation platform and the formwork support platform of top cantilevered structure is provided; Concrete operation step comprises:

(1) structure is pre-buried

(1) at 16 layers of structure pre-buried iron plate 300*200*12 in the outside, as the bottom fulcrum of English truss, spacing is with the spacing of English truss;

Pre-buried suspension ring and bolt M20 on (2) 17 layers of structure flooring vertically arrange three roads; Suspension ring adopt the HPB235 grade reinforcing steel, imbed concrete beam 〉=30d, and welding or colligation be on cage of reinforcement, and spacing is with the spacing of English truss;

(3) 18 layers of pre-buried indwelling suspension ring in the Vierendeel girder outside, the spacing of suspension ring is with the spacing of triangular truss; Suspension ring adopt the HPB235 grade reinforcing steel, imbed concrete beam 〉=30d, and welding or colligation adopt two ф 20 suspension ring on cage of reinforcement, imbed concrete beam 600;

(2) outrigger platform structure

(1) according to design drawing, the H shaped steel 390*300*10*16 of the use of encorbelmenting, long 12m, three place's tie point eyelets have bored in producer at professional steel work, and 4/locate, the eyelet specification is Φ 18, is transported to adopt 50T vapour to hang behind the building site to winch to field position;

(2) H shaped steel English truss is comprised of trivet and H shaped steel, and trivet is comprised of vertical 10# double flute steel, oblique 10# double flute steel, horizontal 10# double flute steel; The double flute steel adopts the 10# channel-section steel to be welded to connect, weld seam 10mm; 3 tie point end full weld welding 250*210*12 iron plates of trivet, weld seam 10mm; According to design drawing, bored the eyelet of Φ 18, be complementary with eyelet on H shaped steel, be transported to the building site after being made by professional steel work producer;

(3) trivet and H shaped steel carry out assembly unit, adopt 12 M16 bolts to be connected between trivet and H shaped steel, by professional steel work personnel, bolt are carried out the moment of torsion detection, carry out the assembly unit of the 2nd Pin English truss after qualified;

(4) adopt a 200T vapour to lift up into the field and carry out the English truss lifting, a Pin English truss lifting connects fasteningly to pre-buried bolt position with the M20 bolt, carry out the lifting of the 2nd Pin English truss after qualified after testing;

(5) install after English truss net support 200T vapour hangs hoisted in position, between English truss, two 10# double flute steel diagonal welding are adopted in the horizontal net support, adopt two 10# double flute steel diagonal welding between the lower chord of English truss, adopt two 10# double flute steel diagonal welding between the montant of English truss, form whole load system;

(6) treat that between English truss, end is all installed in the net support, the triangular truss of choosing from 17 floor faces is as the platform girder, in the English truss outermost, namely under outer suspended scaffold upright rod load, weld 2 10# i iron, Φ 20 steel bar ends of welding 100mm length are spacing as the vertical rod of builder's jack on the 10# i iron;

(7) completely spread the 50mm plank between English truss, according to design drawing, welded 2 first quarter moon iron plates by the constructor on H shaped steel, R=100mm, on every H shaped steel, the anti-suspension ring drawknot that draws four road Φ 18.5*9 wire rope and 18 layers, as safety stock, ignore its effect in calculation diagram;

(8) according to template framed bent distribution map, Φ 20 steel bar ends of welding 100mm length are spacing as vertical rod on H shaped steel;

(9) outrigger platform completely spreads the thick plank of 50mm, the splicing that misplaces between plank, and piece is tight, as security protection;

(10) scaffold upright rod is fixed after being inserted in the limit steel bar head, sets up formwork-support after tying up the bar of sweeping the floor, and vertical pole ' s span conforms to designing requirement, goes on foot high 1500mm;

Formed a load outrigger platform in total from 17 layers of bottom of choosing part like this, can set up steel tube frame and support 19 layers of stay in place formwork on outrigger platform.

Claims (1)

1. the job practices of a high-altitude overhanging mould bases, it is characterized in that: select H shaped steel and trivet make to form triangular truss at the n-2 layer as outrigger platform, set up the falsework of n layer, encorbelment formwork system and n-2 layer, n-1 layer form bracing system is separate, does not affect installation and the dismounting of n-2 layer, n-1 layer template and form bracing system; Cantilevered structure adopts English truss formula structure of steel platform, is supported for the master with the bottom; The steel platform by connecting to form, finally forms an integral platform by 11 Pin English trusses, and operation platform and the formwork support platform of top cantilevered structure is provided; Concrete operation step comprises:

(1) structure is pre-buried

(1) at the n-3 layer structure pre-buried iron plate 300*200*12 in the outside, as the bottom fulcrum of English truss, spacing is with the spacing of English truss;

(2) pre-buried suspension ring and bolt M20 on n-2 layer structure flooring, vertically arrange three roads; Suspension ring adopt the HPB235 grade reinforcing steel, imbed concrete beam 〉=30d, and welding or colligation be on cage of reinforcement, and spacing is with the spacing of English truss;

(3) the pre-buried indwelling suspension ring in the n-1 layer Vierendeel girder outside, the spacing of suspension ring is with the spacing of triangular truss; Suspension ring adopt the HPB235 grade reinforcing steel, imbed concrete beam 〉=30d, and welding or colligation adopt two ф 20 suspension ring on cage of reinforcement, imbed concrete beam 600;

(2) outrigger platform structure

(1) according to design drawing, the H shaped steel 390*300*10*16 of the use of encorbelmenting, long 12m, three place's tie point eyelets have bored in producer at professional steel work, and 4/locate, the eyelet specification is Φ 18, is transported to adopt 50T vapour to hang behind the building site to winch to field position;

(2) H shaped steel English truss is comprised of trivet and H shaped steel, and trivet is comprised of vertical 10# double flute steel, oblique 10# double flute steel, horizontal 10# double flute steel; The double flute steel adopts the 10# channel-section steel to be welded to connect, weld seam 10mm; 3 tie point end full weld welding 250*210*12 iron plates of trivet, weld seam 10mm; According to design drawing, bored the eyelet of Φ 18, be complementary with eyelet on H shaped steel, be transported to the building site after being made by professional steel work producer;

(3) trivet and H shaped steel carry out assembly unit, adopt 12 M16 bolts to be connected between trivet and H shaped steel, by professional steel work personnel, bolt are carried out the moment of torsion detection, carry out the assembly unit of the 2nd Pin English truss after qualified;

(4) adopt a 200T vapour to lift up into the field and carry out the English truss lifting, a Pin English truss lifting connects fasteningly to pre-buried bolt position with the M20 bolt, carry out the lifting of the 2nd Pin English truss after qualified after testing;

(5) install after English truss net support 200T vapour hangs hoisted in position, between English truss, two 10# double flute steel diagonal welding are adopted in the horizontal net support, adopt two 10# double flute steel diagonal welding between the lower chord of English truss, adopt two 10# double flute steel diagonal welding between the montant of English truss, form whole load system;

(6) treat that between English truss, end is all installed in the net support, the triangular truss of choosing from n-2 floor face is as the platform girder, in the English truss outermost, namely under outer suspended scaffold upright rod load, weld 2 10# i iron, Φ 20 steel bar ends of welding 100mm length are spacing as the vertical rod of builder's jack on the 10# i iron;

(7) completely spread the 50mm plank between English truss, according to design drawing, welded 2 first quarter moon iron plates by the constructor on H shaped steel, R=100mm, on every H shaped steel, the anti-suspension ring drawknot that draws four road Φ 18.5*9 wire rope and 18 layers, as safety stock, ignore its effect in calculation diagram;

(8) according to template framed bent distribution map, Φ 20 steel bar ends of welding 100mm length are spacing as vertical rod on H shaped steel;

(9) outrigger platform completely spreads the thick plank of 50mm, the splicing that misplaces between plank, and piece is tight, as security protection;

(10) scaffold upright rod is fixed after being inserted in the limit steel bar head, sets up formwork-support after tying up the bar of sweeping the floor, and vertical pole ' s span conforms to designing requirement, goes on foot high 1500mm;

Formed a load outrigger platform in total from the bottom that the n-2 layer is chosen part like this, can set up steel tube frame and support n layer stay in place formwork on outrigger platform.