CN113323359A - Novel flower basket pull rod tool type overhanging frame construction method - Google Patents

Abstract

The invention discloses a novel flower basket pull rod tool type overhanging frame construction method, which comprises the following steps: the method comprises the following steps: erecting a cantilever frame for preparation; step two: manufacturing a cantilever frame body material; step three: checking the cantilever framework accessories; step four: pre-embedding a beam inner sleeve; step five: mounting I-shaped steel; step six: erecting a scaffold sweeping rod; step seven: installing an upper pull rod and a lower pull rod of the turn buckle; step eight: maintaining; the joint is pulled well, and all dental appliances are protected by being wrapped with butter; the construction method is convenient to operate, wide in application range, safe and reliable, changes the traditional construction method of unloading by using the steel wire rope, changes the connection of the upper part of the beam end by using a phi 20 steel bar, can play the roles of fixing, unloading and relieving the bending moment of a steel beam support by tightening and stressing the turnbuckle, can recycle the turnbuckle and the steel bar for secondary utilization, is safer, economic and reasonable compared with the conventionally used steel wire rope, and reduces the cost.

Description

Novel flower basket pull rod tool type overhanging frame construction method

Technical Field

The invention relates to the technical field of main structures of high-rise buildings, in particular to a novel flower basket pull rod tool type cantilever frame construction method.

Background

With the rapid development of urban construction, the number of high-rise and super high-rise buildings is increasing, the construction environment is becoming more and more complex, and in order to meet the requirements of structural construction and external decoration construction, the cantilever type steel pipe fastener external scaffold is widely applied due to the characteristics of wide adaptability, strong bearing capacity, convenience in erection and detachment and the like. However, the length of the I-steel placed on the floor of the previous overhanging scaffold is larger than that of the overhanging scaffold, so that the I-steel is wasted, and inconvenience is brought to subsequent construction.

Disclosure of Invention

The invention aims to provide a novel flower basket pull rod tool type cantilever frame construction method, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a novel flower basket pull rod tool type overhanging frame construction method comprises the following steps:

the method comprises the following steps: erecting a cantilever frame for preparation;

step two: manufacturing a cantilever frame body material;

step three: checking the cantilever framework accessories;

and (4) carrying out total inspection on the cantilever framework fittings according to the design requirements of construction organization. Checking the model, specification, quantity, component shape change and connecting plate defect, matching the bolt hole with the bolt, and filling in a checking table;

step four: pre-embedding a beam inner sleeve;

step five: mounting I-shaped steel;

after the strength of the concrete meets the requirement, removing the side mold of the beam, dredging the inner sleeve of the embedded beam, and enabling the 20 x 300 mm high-strength bolt and the gasket to penetrate through the sleeve hole from inside to outside;

sleeving the end part of the processed I-shaped steel into the two placed high-strength bolts, then respectively adding gaskets on the bolts to match with two high-strength screw caps, and screwing the screw caps by using a spanner;

for the I-steel at the corner, because the embedded bolts cannot be embedded and the angle is limited, the I-steel which must be placed at the corner can be made of steel plates, and then the I-steel and the steel plates are welded on site according to the actual situation on site.

Step six: erecting a scaffold sweeping rod;

after the I-shaped steel for overhanging is completely installed in place, firstly arranging a ground sweeping rod of the overhanging frame on the I-shaped steel, and after the ground sweeping rod is arranged, sleeving the vertical rod on the reinforcing steel bar head and firmly connecting the vertical rod with the ground sweeping rod;

and finishing the erection of the cantilever layer frame body according to the erection requirement of the common scaffold.

Step seven: installing an upper pull rod and a lower pull rod of the turn buckle;

after the upper layer of concrete is cantilevered to reach the strength, the beam side die is disassembled, the high-strength bolt gasket penetrates out of the sleeve from inside to outside, and the lug plate of the upper pull rod and the high-strength bolt are firmly fixed by double nuts and gaskets;

preliminarily fixing the lower pull rod and an ear plate on the I-shaped steel by using a high-strength bolt and a gasket, and firmly fixing the lower pull rod after the upper pull rod extends into the upper pull rod;

butting the turn buckle bolt hole with the lower pull rod screw thread for continuous rotation, then loosening the lug plate screw, extending the turn buckle bolt into the upper pull rod screw thread for rotation until the turn buckle bolt is not moved, then rotating the turn buckle bolt by using a tool until the lower pull rod lug plate and the I-shaped steel lug plate just can extend into the high-strength bolt, and then timely penetrating the bolt and screwing the bolt;

finally, the turn buckle is rotated to be fixed by a tool, and the installation of the upper pull rod and the lower pull rod is finished after the tightening of the pull rods is confirmed;

after the cantilever layer scaffold is erected, the cantilever layer is sealed by the old template in time.

Step eight: maintaining;

the joint is pulled well, and all dental appliances are protected by being wrapped with butter;

and regularly checking whether the turn buckle is rusted or loosened.

As a further scheme of the invention: the construction method comprises the following steps of learning an engineering building structure construction drawing, compiling a cantilever frame and scaffold construction organization design, determining the segmented height of the scaffold according to the construction drawing, wherein each segment is not more than 20m, determining the longitudinal distance between the cantilever frames along a building, determining the use type of the cantilever frame, including the number of common types, lengthened types and overlong types, when finding that the field condition is inconsistent with the design type, timely communicating and coordinating with a technical department, modifying the design, and drawing a cantilever scaffold arrangement plan view and a sectional view on the basis to serve as one of construction organization contents.

As a still further scheme of the invention: blanking and welding an iron plate at the end part of the I-shaped steel in the second step;

drawing a processing plan according to the length of the selected 16# I-steel and the size and thickness of the iron plate, performing bottom crossing on workers, cutting and blanking by oxygen on site, and meanwhile, entrusting a processing factory to perform finished product processing;

(1) taking an I-shaped steel with the length of 1.5 meters, welding a phi 22 x 30 mm reinforcing head at a position 10 cm away from the front end of the I-shaped steel to stabilize the vertical rod of the scaffold, welding a 100 x 12 mm iron plate at a position 15 cm away from the welding reinforcing head, welding a 200 x 220 x 12 mm iron plate at the tail end of the steel with the I-shaped steel, and welding the hole pitch of 110 mm;

(2) machining a turn buckle;

performing blanking cutting according to the shape, size and specification of the selected bolt after calculation of the scheme, drawing a processing plan of the turn buckle, and performing on-site processing after bottom intersection on workers;

carrying out double-sided welding on phi 20X 1.6 m and phi 20X 1.0 m high-quality carbon steel and three phi 14 high-quality carbon steels, and assembling and mounting machined and formed turn-buckle bolts;

(3) manufacturing and welding a pull rod;

drawing a processing plane diagram of the upper pull rod, the lower pull rod and the ear plate, performing bottom crossing on a worker, cutting and blanking on site, bending the upper end phi 20 x 1.6 m carbon high-quality steel and the 250 x 10 x 12 mm iron plate into 20 degrees, punching and cutting the groove pitch according to the floor surface, further performing groove welding, determining the lower end phi 20 x 1.0 m carbon high-quality steel and the 250 x 10 mm iron plate according to the floor surface, punching and cutting the groove pitch, wherein the groove pitch is 20 x 100, and further performing groove welding.

Compared with the prior art, the invention has the beneficial effects that:

1. the construction method is convenient to operate, wide in application range, safe and reliable.

2. The construction method changes the traditional construction method of unloading by using the steel wire rope, changes the connection of the upper part of the beam end by using the phi 20 steel bar, can play the roles of fixing, unloading and relieving the bending moment of the steel beam support by tightening and stressing the turn-buckle bolt, can recycle the turn-buckle bolt and the steel bar, is safer, economic and reasonable compared with the conventionally used steel wire rope, and reduces the cost.

3. According to the construction method, the stress of the traditional I-steel cantilever beam is changed into the stress of a simply supported beam, the section characteristics of the I-steel are symmetrical and are stressed clearly, the tail end of the steel beam is fixed by a bolt, the upper part of the cantilever end of the steel beam is tightened by a turn buckle and stressed, the construction method belongs to the best state of axis stress, and the bending resistance is good.

4. The construction method changes the construction method of anchoring the traditional steel girder on the floor, changes the steel cantilever beam to be fixed on the building by bolts, shortens the length of the cantilever steel girder by more than half compared with the traditional cantilever steel girder, reduces the cost, does not need to stretch into the building, does not need to reserve a hole on the wall surface, does not need to be sealed and repaired again during the wall surface construction, does not influence the floor construction of the floor surface of the subsequent operation, does not need to carry out the floor construction after the cantilever steel girder is dismantled, reduces the quality common fault of water seepage of the hole and shortens the construction period.

5. The upper part of the cantilever steel beam is basically level to the concrete floor, and the cantilever steel beam is protected in place after an old template is paved, so that the cantilever steel beam is convenient to clean.

Drawings

FIG. 1 is a steel plate processing plan view in a novel flower basket pull rod tool type overhanging frame construction method.

FIG. 2 is a field blanking diagram of I-shaped steel and steel plates in the novel flower basket pull rod tool type overhanging frame construction method.

FIG. 3 is a field welding diagram of I-shaped steel and steel plates in the novel flower basket pull rod tool type overhanging frame construction method.

FIG. 4 is a machining plan view of a turn buckle in the novel turn buckle tool type overhanging frame construction method.

FIG. 5 is a drawing of the on-site processing of the turn buckle in the novel turn buckle tool type overhanging frame construction method.

Fig. 6 is a cross-sectional view of the tie bar and the building in the novel flower basket tie bar tool type cantilever frame construction method.

Fig. 7 is a plane processing diagram of an upper pull rod in the novel flower basket pull rod tool type overhanging frame construction method.

FIG. 8 is a groove welding profile in the novel flower basket pull rod tool type cantilever frame construction method.

FIG. 9 is a plan view of the lower tie bar and the connecting plate in the novel construction method of the flower basket tie bar tool type cantilever frame.

Fig. 10 is a drawing of a pull rod field processing in the novel flower basket pull rod tool type overhanging frame construction method.

FIG. 11 is a field processing diagram of a connecting plate in a novel construction method of a flower basket pull rod tool type cantilever frame.

Fig. 12 is a bolt hole laying-out diagram in the novel flower basket pull rod tool type overhanging frame construction method.

Fig. 13 is a high-strength bolt placement diagram in the novel flower basket pull rod tool type overhanging frame construction method.

FIG. 14 is an I-shaped steel fastening diagram in a novel flower basket pull rod tool type overhanging frame construction method.

FIG. 15 is a welding drawing of a joist steel at the corner in the novel basket pull rod tool type cantilever frame construction method.

Fig. 16 is a diagram of the layout of the ground sweeping rods of the cantilever frame in the novel basket pull rod tool type cantilever frame construction method.

FIG. 17 is a connection diagram of a turn buckle and a lower link in a novel turn buckle tool type overhanging frame construction method.

FIG. 18 is a connection diagram of a turn buckle and an upper pull rod in a novel turn buckle tool type overhanging frame construction method.

Fig. 19 is a turn buckle fastening diagram in the novel turn buckle tool type overhanging frame construction method.

FIG. 20 is an interior elevation view of a cantilever in the novel construction method of a flower basket pull rod tool type cantilever.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 20, in an embodiment of the present invention, a novel flower basket pull rod tool type cantilever frame construction method includes the following steps:

the method comprises the following steps: erecting a cantilever frame for preparation;

the construction drawing of the engineering building structure, the weaving of the cantilever frame and the construction organization design of the scaffold are familiar. Determining the sectional height of the scaffold according to a construction drawing, wherein each section is not more than 20m, determining the longitudinal distance between cantilever frames along a building, determining the use types of the cantilever frames, including the numbers of common types, lengthened types and overlong types, when finding that the field condition is inconsistent with the design model, communicating and coordinating with a technical department in time, modifying the design, and drawing a cantilever scaffold arrangement plan view and a sectional view on the basis as one of construction organization contents;

step two: manufacturing a cantilever frame body material;

(4) blanking and welding iron plates at the end parts of the I-shaped steel;

drawing a processing plan according to the length of the selected 16# I-steel and the size and thickness of the iron plate, performing bottom crossing on workers, cutting and blanking by oxygen on site, and meanwhile, entrusting a processing factory to perform finished product processing;

(5) taking an I-shaped steel with the length of 1.5 meters, welding a phi 22 x 30 mm reinforcing head at a position 10 cm away from the front end of the I-shaped steel to stabilize the vertical rod of the scaffold, welding a 100 x 12 mm iron plate at a position 15 cm away from the welding reinforcing head, welding a 200 x 220 x 12 mm iron plate at the tail end of the steel with the I-shaped steel, and welding the hole pitch of 110 mm;

(6) machining a turn buckle;

performing blanking cutting according to the shape, size and specification of the selected bolt after calculation of the scheme, drawing a processing plan of the turn buckle, and performing on-site processing after bottom intersection on workers;

carrying out double-sided welding on phi 20X 1.6 m and phi 20X 1.0 m high-quality carbon steel and three phi 14 high-quality carbon steels, and assembling and mounting machined and formed turn-buckle bolts;

(7) manufacturing and welding a pull rod;

drawing a processing plane diagram by the upper pull rod, the lower pull rod and the ear plate, performing bottom crossing on a worker, cutting and blanking on site, bending the upper end phi 20 x 1.6 m carbon high-quality steel and the 250 x 10 x 12 mm iron plate into 20 degrees, punching and cutting the groove pitch according to the floor surface, further performing groove welding, determining the lower end phi 20 x 1.0 m carbon high-quality steel and the 250 x 10 mm iron plate according to the floor surface, punching and cutting the groove pitch, wherein the groove pitch is 20 x 100, and further performing groove welding;

step three: checking the cantilever framework accessories;

and (4) carrying out total inspection on the cantilever framework fittings according to the design requirements of construction organization. Checking the model, specification, quantity, component shape change and connecting plate defect, matching the bolt hole with the bolt, and filling in a checking table;

step four: pre-embedding a beam inner sleeve;

after the top plate formwork is erected and before the beam outer formwork is closed, a positioning line is accurately released on the formwork surface according to a limited scaffold I-steel plane layout drawing,

upper end: embedding a 25 x 200 mm sleeve at the corresponding position of the upper storey of the I-shaped steel cantilever, sealing two ends of the sleeve by using adhesive tapes, and welding the sleeve on the beam and the wall column;

lower end: embedding a high-strength bolt sleeve before cantilever by adopting a phi 25 x 200 mm hollow steel pipe, sealing two ends by using adhesive tapes, embedding the hollow steel pipe into a steel bar binding beam and a wall column for welding and fixing, and embedding a 200 x 220 x 12 mm iron plate at a corner;

after the sleeve is pre-buried, a specially-assigned person is dispatched to recheck the planar arrangement size and the height position of the sleeve, so that the position deviation of the sleeve is reduced to the minimum;

in the concrete pouring process, a specially-assigned person is required to perform tracking operation, blanking is strictly forbidden at the position with the embedded casing, and in the vibrating process, an operator strictly forbids collision on the casing.

Step five: mounting I-shaped steel;

after the strength of the concrete meets the requirement, removing the side mold of the beam, dredging the inner sleeve of the embedded beam, and enabling the 20 x 300 mm high-strength bolt and the gasket to penetrate through the sleeve hole from inside to outside;

sleeving the end part of the processed I-shaped steel into the two placed high-strength bolts, then respectively adding gaskets on the bolts to match with two high-strength screw caps, and screwing the screw caps by using a spanner;

for the I-steel at the corner, because the embedded bolts cannot be embedded and the angle is limited, the I-steel which must be placed at the corner can be made of steel plates, and then the I-steel and the steel plates are welded on site according to the actual situation on site.

Step six: erecting a scaffold sweeping rod;

after the I-shaped steel for overhanging is completely installed in place, firstly arranging a ground sweeping rod of the overhanging frame on the I-shaped steel, and after the ground sweeping rod is arranged, sleeving the vertical rod on the reinforcing steel bar head and firmly connecting the vertical rod with the ground sweeping rod;

and finishing the erection of the cantilever layer frame body according to the erection requirement of the common scaffold.

Step seven: installing an upper pull rod and a lower pull rod of the turn buckle;

after the upper layer of concrete is cantilevered to reach the strength, the beam side die is disassembled, the high-strength bolt gasket penetrates out of the sleeve from inside to outside, and the lug plate of the upper pull rod and the high-strength bolt are firmly fixed by double nuts and gaskets;

preliminarily fixing the lower pull rod and an ear plate on the I-shaped steel by using a high-strength bolt and a gasket, and firmly fixing the lower pull rod after the upper pull rod extends into the upper pull rod;

butting the turn buckle bolt hole with the lower pull rod screw thread for continuous rotation, then loosening the lug plate screw, extending the turn buckle bolt into the upper pull rod screw thread for rotation until the turn buckle bolt is not moved, then rotating the turn buckle bolt by using a tool until the lower pull rod lug plate and the I-shaped steel lug plate just can extend into the high-strength bolt, and then timely penetrating the bolt and screwing the bolt;

finally, the turn buckle is rotated to be fixed by a tool, and the installation of the upper pull rod and the lower pull rod is finished after the tightening of the pull rods is confirmed;

after the cantilever layer scaffold is erected, the cantilever layer is sealed by the old template in time.

Step eight: maintaining;

the joint is pulled well, and all dental appliances are protected by being wrapped with butter;

and regularly checking whether the turn buckle is rusted or loosened.

Processing and manufacturing material requirements

The main materials, parts, finished products, standard parts and other products of the work cantilever frame are all checked and accepted.

The variety, specification, performance and the like of the steel products meet the national product standard and design requirements. Checking quantity: and (6) checking the total number.

The thickness and the allowable deviation of the steel plate meet the standard requirements of the steel plate, the inspection number difference is checked, and the steel plate of each variety of specifications is checked at 5.

The specification size and the allowable deviation of the section steel meet the product standard requirements.

Checking quantity: and 5, spot inspection of the section steel of each variety and specification.

The checking method comprises the following steps: measuring with a steel ruler and a vernier caliper.

The surface appearance quality of the steel material meets the following requirements except that the surface appearance quality of the steel material meets the current relevant national standard:

(1) when the surface of the steel has defects such as rust pits or scratches, the depth of the steel is not more than 1/2 of the allowable deviation value of the thickness of the steel

(2) The steel surface corrosion grade is in accordance with the C grade and above C grade specified in the current national standard (the steel surface corrosion grade and rust removal grade before coating) GB 8923.

(3) The edge or the fracture of the steel material should not have the defects of layering, slag inclusion and the like.

Checking quantity: total number checking

The checking method comprises the following steps: inspection by observation

Welding material requirements

The welding material, variety, specification, performance and the like meet the current national product standard and design requirements.

Checking quantity: total number checking

The checking method comprises the following steps: checking the welding material and the quality certificate file, Chinese sign and inspection report.

Pull rod, connecting steel plate. The welding material should be sampled and retested, and the retested result should meet the current national product standard and design requirement.

Checking quantity: total number checking

The checking method comprises the following steps: review report

Appearance of the welding rod: the medicine skin should not fall off. The welding core is rusted and the like: the flux should not be moisture-bound.

Checking quantity: 1% of spot check according to the amount, and should not be less than 10 packets.

The checking method comprises the following steps: and (6) observing and checking.

Fastening standard for connection

Principal material

The high-strength bolt for high-strength large hexagon bolt connection and vice and torsional shear type high-strength bolt connection pair has the characteristics that the variety, specification, performance and the like of the high-strength bolt meet the current national product standard and design requirements, and the high-strength bolt is provided with a torque coefficient and a fastening force, namely a prestress inspection report and the like when leaving a factory.

The torque coefficient of the high-strength hexagon bolt connection is tested according to the specification of the specification appendix B, and the test result of the high-strength hexagon bolt connection is in accordance with the specification of the appendix B.

The high-strength bolt is connected and should be supplied in a matched manner according to a packing box, the appearance surfaces of a batch number, specification, quantity, date, bolts, nuts and washers should be protected by oil coating, rusting and contamination should not occur, and threads should not be damaged.

Checking quantity: checking 5% and not less than 3 boxes according to the number of the packaging boxes

The checking method comprises the following steps: and (6) observing and checking.

Coating material

The varieties, specifications, performances and the like of materials such as steel structure antirust paint, diluent, curing agent and the like meet the current national product standard and design requirements.

Checking quantity: and (6) checking the total number.

The checking method comprises the following steps: and checking a quality certification file, a Chinese mark, an inspection report and the like of the product.

Weld seam requirement

Welding materials such as welding rods, welding fluxes and the like are matched with the base metal and meet the design requirements and the regulations of the national current industry standard (welding technical specification of the building steel structure) JGJ 81.

Checking quantity: total number checking

The checking method comprises the following steps: the quality certificate and the baking record were checked.

The welder must be qualified through an examination and obtain a certificate of qualification. The certified welders must weld on the qualified test items and the approved range thereof.

Checking quantity: and (6) checking the total number.

The checking method comprises the following steps: and checking the validity period of the welder qualification certificate and the approval range thereof.

The primary and secondary welding lines which are required to be completely welded through design are subjected to ultrasonic flaw detection to detect internal defects.

The quality grade and defect classification of the first-level welding seam and the second-level welding seam meet the regulations of the following table:

checking quantity: total number checking

The checking method comprises the following steps: inspection ultrasonic flaw detection record

The surface of the welding seam must not have the defects of cracks, welding flash and the like. The first-stage welding seam and the second-stage welding seam have no defects of surface air holes, slag inclusion, arc pit cracks, electric arc scratches and the like. And the primary welding seam has the defects of undercut, incomplete welding root contraction and the like.

Checking quantity: and performing spot check on each batch of similar components by 10 percent and not less than 3 pieces, performing spot check on each type of welding line in the checked components by 5 percent according to the number of the welding lines, and not less than 1, wherein the total spot check number at each check 1 position is not less than 10 positions.

The checking method comprises the following steps: and (5) observing and checking or checking by using a magnifying glass, a welding line gauge and a steel ruler.

Checking a general item: the appearance quality standards of the second-level and third-level welding seams meet the specification of A.0.1 in the specification appendix A. The allowable deviation of the weld size meets the A.0.2 specification. The weld seam perception is as follows: the appearance is even, the shaping is better, and the welding bead is more smooth with the transition between basic metal with the welding bead, and welding slag and splash are clean basically.

Checking quantity: each batch of similar components is spot-inspected for 10% and not less than 3, in the spot-inspected components, each welding line is spot-inspected for 5% according to the quantity, and the total spot-inspection position is not less than 5.

The checking method comprises the following steps: and (6) observing and checking.

Fastener joint

High-strength bolt connection. And (3) carrying out final screwing torque inspection within 48 hours after the high-strength large hexagon head bolt is connected and finally screwed for 1h, wherein the inspection result meets the specification of the appendix B of the specification.

Bolt prestress value range (KN) meter

Steel part and steel part processing

Cutting master control project

(1) The cut surface or shear surface of the steel material has no defects of cracks, slag inclusion, delamination and larger than 1mm

Checking quantity: total number checking

The checking method comprises the following steps: observing or checking with magnifying glasses and graduated scales

(2) Tolerance to gas cutting is in accordance with the following table

Making holes

(1) Hole making main control items: A. class B bolt holes (class I holes) should have a precision of H12, hole wall surface roughness R.

Should not be greater than 12.5 Um. The allowable deviation of the pore diameter meets the specification of the following table.

Checking quantity: spot-checking 10% according to the quantity of steel and not less than 3 pieces

The checking method comprises the following steps: checking with a vernier caliper or a bore gauge.

Assembly

The allowable deviation of the welded connection assembly should meet the following table

Checking quantity: checking 10% by component number, and not less than 3 checking methods: testing with a steel ruler

The abutting contact surface is tightly attached with an area of more than 75%.

Checking quantity: spot-checking 10% by number of contact areas, and should not be less than 10

The checking method comprises the following steps: the plugging area of the rubber plug is less than 25 percent and the edge gap is not more than 0.8mm by using a 0.3mm feeler gauge for inspection.

The allowable deviation of the installation weld groove conforms to the following table

Item	Tolerance deviation
		Bevel angle	±5°
Pure edge	±1.0mm

Checking quantity: and (4) performing spot check on 10% according to the number of grooves, wherein the number of grooves is not less than 3.

The checking method comprises the following steps: and checking by using a welding seam gauge.

Overall dimension of steel member

The allowable deviation of the main control project of the external dimension of the steel member is conformed to the following

Girder choosing surface:

(1) plus or minus 5.0 of short reinforcing steel bar head of sleeve-hardened steel pipe

(2) Connecting plate + -3.0 at lower end of diagonal draw bar

(3) Cantilever beam end connecting plate +/-3.0

(4) Deviation of bolt holes on cantilever beam end connecting plate is +/-2.0

Deviation of diagonal draw bar and connecting plate

(1) Bolt hole deviation of +/-2

(2) The web is offset by + -2.

Main machines and tools

The construction machinery and equipment required by the construction method are common machinery and equipment in a construction site, investment does not need to be increased, and the construction machinery and the equipment are purchased additionally, and mainly comprise an electric welding machine, gas cutting equipment and a tower crane, and specifically comprise the following steps:

(1) measuring and paying off and detecting: level, theodolite, steel tape, moment spanner, level.

(2) Installing a tool: electric welding machine, gas cutting equipment, hammer, spanner, cooperation tower crane.

(3) Power supply: block terminal, switch box, power cable.

Quality control

The maximum height of the cantilever scaffold does not exceed 28 m.

The distance between the cantilever frames along the longitudinal direction of the building is 1.40-1.50, and the maximum distance between the outer-row scaffold upright rods at each corner is less than or equal to 1.70.

The vertical distance between the upper end and the lower end of the inclined pull rod of the cantilever frame is more than or equal to 2.80, and the elevation angle cannot be too small. The elevation angle of the common cantilever beam diagonal draw bar is larger than 55 degrees, the lower end of the diagonal draw bar must be close to the upright rod of the outer row scaffold, and the position of the pull-down connecting plate cannot be changed randomly.

The ultra-long cantilever beam diagonal draw bar adopts two diagonal draw bars, which is not necessary to be wrong.

The cantilever frames at the entrances and exits of the passenger and goods elevators are not consistent with design settings due to large loads, and must be reinforced, the number of the cantilever frames is increased, and clear regulations are given in construction organization design.

The upper pull point of the inclined pull rod of the cantilever beam and the lower support point of the cantilever beam are reserved, and the position and the specification of a bolt hole are correct. An upper pulling point and a lower supporting point. Typically at the concrete ring beam or at the edge of the edge beam.

70 x 8 pressing plates are arranged on the outer sides of the pull-up point iron plates of the diagonal draw bars, double nuts are arranged outside the pressing plates, and the exposed length of the bolt end is more than or equal to 1 nut thickness. Ensuring that the spot is reliable in use and does not distort.

After the cantilever frame is completed, the project department technical responsible person calls the project, and the quality personnel, the security personnel and the cantilever frame security responsible person who participate in the project manager check and accept the project manager, wherein the check and accept contents are as follows:

(1) material type and specification, welding line making, and checking the making inspection record.

(2) The concrete strength reaches over 80% of the design value when the cantilever frame is connected with a building.

(3) The variety and the specification of the through-wall high-strength bolt meet the design requirements

(4) The bolt, the washer or the base plate and the pressure plate must not be missed.

(5) And 5% of spot check of the screwed high-strength bolt, the prestress value of the 8.8-grade phi 20 bolt reaches 120KN, and the number of unqualified bolts is not more than 10% of the spot check number.

(6) The allowable longitudinal deviation of the cantilever beam distance does not exceed +/-50 mm.

(7) The cantilever beam must be horizontal, the levelness is less than L/1000, and must not be more than 20.

(8) The height difference between the cantilever beams is not more than +/-20

During the use process, the inspection is carried out by the following stages according to the engineering characteristics

(1) Before the fixed back shelf that finishes of the installation of the girder steel of encorbelmenting was set up, the size position of main inspection installation, whether the installation is firm, whether roof concrete strength reaches the requirement.

(2) Before applying construction load on working layer

(3) After each 10-13 m of height is built

(4) After reaching the design height

(5) After encountering grade six strong wind and heavy rain

(6) Stop for more than one month

Besides the inspection according to the stages, the project safety department has to carry out not less than two times of weekly inspection on the rack, and the technical department arranges the measuring personnel to carry out the deformation observation of the rack in time, wherein the observation projects mainly comprise the perpendicularity and the deformation of the rack.

The inspection and acceptance of the shelf each time are recorded by the security inspection department and put into the security data for archiving. Major items for shelf acceptance and periodic inspection:

(1) arrangement and connection of members, construction of wall-connecting member, supporting and discharging platform

(2) Whether fastener bolt is loose

(3) Deformation of shelves

(4) Safety protection measure

(5) Whether it is overloaded.

Safety measures

The worker who ascends the height and erects (the scaffold worker) must be trained by professional safety technology, the examination is qualified, and the worker holds the special operation certificate to do the job on duty.

When a worker (a scaffold worker) needs to correctly use personal safety protection articles in the construction process, the worker needs to be flexible (tight sleeves), and needs to wear anti-skid shoes and safety belts during high-altitude operation.

Before the cantilever scaffold is erected, erecting personnel must be organized, requirements of special safety construction organization design and safety technical measures of the scaffold are carefully comprehended, the erecting method is discussed, labor is clearly divided, and 1 skilled person is assigned to be responsible for erecting technical guidance and monitoring.

The erection and dismantling operation of the scaffold should be stopped in severe weather such as strong wind with more than six levels of wind power (including six levels), high temperature, heavy rain, heavy snow, heavy fog and the like. After wind, rain and snow pass, the inspection is carried out, and the inclined sinking, loosening and collapsing are found to be repaired in time, so that the back can be used after the product is qualified.

The scaffold is erected according to the progress of the project, and the unfinished scaffold is erected, so that unfixed members and potential safety hazards cannot be left when the scaffold leaves an operation post.

The project responsible person, the security officer and the shelf worker chief should check and accept the scaffold by stages according to the progress built by the scaffold, and fill in a construction scaffold check and acceptance table, and the person can be put into use after the experience collection table.

The materials used in the high-altitude operation are stably stacked, the tools are placed into the tool bags conveniently, and the detached objects, residual materials, waste materials and the like are cleaned and timely transported away without being thrown randomly or discarded downwards. The object cannot be thrown when being transferred.

All safety protection facilities and safety signs etc. must not be destroyed or removed or tampered with by anyone. When the safety protection facilities are temporarily removed or changed due to the operation needs, the safety protection facilities are removed after approval is reported, and the safety protection facilities are recovered after the operation is completed.

The safety personnel in the construction site need carry out safety inspection to scaffold frame every day, especially carry out the inspection to the high strength bolt of fixed I-steel, welding seam, basket screw rod, even wall spare, scaffold board, pocket net, block waist pole etc. and find the problem in time and rectify and improve.

When the electric welding operation is carried out on the scaffold, iron sheets are paved to be connected with sparks or inflammable substances are removed,

so as to prevent the ignition of the combustibles by the spark. And at the same time prepares for fire protection measures. Once on fire, the fire can be extinguished in time.

The workers on the frame should work and cooperate, the gravity center should be well controlled when the rod pieces are transferred, the materials are stably transferred, and the materials do not need to be dumped, fiercely knocked or other rushed discharging modes.

The gap between the bottom of the overhanging scaffold and the wall body is tightly sealed by the bamboo splint, so that objects are prevented from falling from the gap.

The overhanging horizontal I-shaped steel is used as a horizontal lightning protection belt and is welded and connected with a lightning protection down lead of a building by adopting phi 12 galvanized steel bars, and the lightning protection grounding resistance structure is not more than 10 omega.

Environmental protection measure

In the operation of erecting and dismantling the scaffold, the material transportation needs to be carried out lightly so as not to generate noise and influence the life of residents.

The materials such as the I-shaped steel, the steel pipe and the like prevent the paint from dripping in the processes of brushing the antirust paint and the safety warning paint, and paint waste materials cannot be discarded at will so as not to pollute soil, water and atmosphere.

When wind power of three or more levels is met, the scaffold vertical face safety net and the bottom sealing layer are forbidden to be dismantled, so that dust pollution is prevented.

The quality of the dense mesh type safety net is strictly related to the use of the non-flame-retardant safety net, so as to avoid fire. The abandoned safety net is recycled in a centralized way and cannot be discarded randomly.

Designing and managing a construction general plan, and performing environmental protection according to the actual situation of a site. The waste gas of electric welding is reduced as much as possible, the noise is reduced as much as possible, and the light stimulation of electric welding arc is reduced. The processing field is fully utilized, the open-air welding and prefabrication processing are reduced to the greatest extent, and enclosure measures are taken for inevitable electric welding.

The method has the advantages that the environmental protection work is well done, measures are taken to prevent environmental pollution, construction garbage and solid waste are intensively stacked in a specified place and are periodically treated, and the renewable resources are fully recovered.

Benefit analysis

Economic benefits

According to the newly issued technical specification of scaffold for building construction (JGJ130-2011), the design of the cantilever steel beam is 1: 1.25, the existing tool type overhanging steel beam is 1.3 meters, and 1.7 meters of I-steel and round steel tension ring anchoring in the original laying floor is reduced; the steel wire rope drawknot needs 4 meters of steel wire ropes, one turn buckle and 6 rope clamps for each original steel wire rope, the cost of the steel wire ropes is 16 yuan per meter, and 176 yuan can be saved by measuring and calculating the direct cost of each cantilever steel beam. The tool type overhanging scaffold used in the Nanjing Qingcheng 03# building and the common steel wire rope overhanging scaffold save about 12 ten thousand yuan of economic investment cost.

Social benefits

The tool type overhanging scaffold ensures safety and attractiveness. The cost is greatly saved, the construction period is shortened, and common quality problems such as water seepage of the outer wall are controlled in advance;

construction convenience, if the scaffold that encorbelments with ordinary wire rope has brought the unable end of multilayer terrace construction to the construction, influence the whole completion time of engineering, just can pour the floor terrace of encorbelmenting after wire rope and the I-steel have been torn open, and use the instrument formula scaffold that encorbelments can directly carry out the terrace construction, have dissolved the influence that the girder steel of encorbelmenting of scaffold was pour the terrace. The most main tool type overhanging scaffold can be repeatedly recycled, so that the construction period is shortened, the cost is saved, and the safety risk is reduced.

Engineering examples

Engineering example one

The county construction project of the Marsai village committee of the Malayi street office in Zhongping City is located in six southwest roads of Crane in Zhongping City, five eastern roads of carignane spring and seven western roads of carignane spring, and is a newly-built civil building (residential, old-age care and commercial). The total floor area of the project is 3.9 ten thousand square meters, the total building area is 12.9 ten thousand m2 (including 1.37 ten thousand m2 for business); comprises 5 high-rise residences, 1 three-storey apartment for the elderly and 1 two-storey shopping mall; a subterranean formation. The structure type is a frame/shear wall structure. The scaffold adopts the flower basket pull rod tool type overhanging scaffold, is erected upwards from 3 floors, is totally divided into four sections to be overhung, has good using effect and is well commented by owners and departments in charge.

Engineering example two

The Hangzhou Mingzhu Jinling international hotel is composed of a basement, a main building, an apron building and a rainwater and sewage treatment pool, wherein the underground layer is a first floor, the apron building is a frame with 4 layers, the main building is a shear wall with 23 layers, the total construction area of the project is about 57000 ten thousand square meters, the start time is 2011 and 3 months, and the completion time is 2013 and 11 months. The scaffold adopts a flower basket pull rod tool type overhanging scaffold, is erected upwards from 4 floors, is overhanging in three sections, has good using effect and is popular among owners and competent departments.

Engineering example three

The oriental hospital of Chongqing city people hospital is one floor underground, 21 floors above ground and 47968.98 square meters of building area. The ground 21 floors are all courtyards, and the total building height is 89.90 meters. The construction method comprises the following steps that 1, the start time is 2011 and the completion time is 2013 and 8, the scaffold for the outer wall adopts a flower basket pull rod tool type overhanging scaffold, in order to facilitate waterproof construction and earthwork backfilling of the outer wall of the basement, a first step of lifting frame is firstly arranged on a second floor, and a landing scaffold is erected after the earthwork is backfilled and sunk to pour the hard ground; six layers, twelve layers and eighteen layers of cantilever racks are respectively arranged on the upper part.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims (4)

1. The utility model provides a novel flower basket pull rod instrument formula cantilever frame construction method which characterized in that: the construction method comprises the following steps:

the method comprises the following steps: erecting a cantilever frame for preparation;

step two: manufacturing a cantilever frame body material;

step three: checking the cantilever framework accessories;

checking the cantilever frame fittings by comparing construction organization design requirements for total inspection, checking the type, specification, quantity, component appearance change, connecting plate defects, matching bolt holes with bolts, and filling in an inspection table;

step four: pre-embedding a beam inner sleeve;

step five: mounting I-shaped steel;

after the strength of the concrete meets the requirement, removing the side mold of the beam, dredging the inner sleeve of the embedded beam, and enabling the 20 x 300 mm high-strength bolt and the gasket to penetrate through the sleeve hole from inside to outside;

sleeving the end part of the processed I-shaped steel into the two placed high-strength bolts, then respectively adding gaskets on the bolts to match with two high-strength screw caps, and screwing the screw caps by using a spanner;

for the I-steel at the corner, because the embedded bolt cannot be embedded and the angle is limited, the I-steel which must be placed at the corner can be a steel plate, and then the I-steel and the steel plate are welded on site according to the actual situation on site;

step six: erecting a scaffold sweeping rod;

after the I-shaped steel for overhanging is completely installed in place, firstly arranging a ground sweeping rod of the overhanging frame on the I-shaped steel, and after the ground sweeping rod is arranged, sleeving the vertical rod on the reinforcing steel bar head and firmly connecting the vertical rod with the ground sweeping rod;

finishing the erection of the cantilever layer frame body according to the erection requirement of a common scaffold;

step seven: installing an upper pull rod and a lower pull rod of the turn buckle;

after the upper layer of concrete is cantilevered to reach the strength, the beam side die is disassembled, the high-strength bolt gasket penetrates out of the sleeve from inside to outside, and the lug plate of the upper pull rod and the high-strength bolt are firmly fixed by double nuts and gaskets;

preliminarily fixing the lower pull rod and an ear plate on the I-shaped steel by using a high-strength bolt and a gasket, and firmly fixing the lower pull rod after the upper pull rod extends into the upper pull rod;

butting the turn buckle bolt hole with the lower pull rod screw thread for continuous rotation, then loosening the lug plate screw, extending the turn buckle bolt into the upper pull rod screw thread for rotation until the turn buckle bolt is not moved, then rotating the turn buckle bolt by using a tool until the lower pull rod lug plate and the I-shaped steel lug plate just can extend into the high-strength bolt, and then timely penetrating the bolt and screwing the bolt;

finally, the turn buckle is rotated to be fixed by a tool, and the installation of the upper pull rod and the lower pull rod is finished after the tightening of the pull rods is confirmed;

after the overhanging layer scaffold is erected, sealing the overhanging layer by using an old template in time;

step eight: maintaining;

the joint is pulled well, and all dental appliances are protected by being wrapped with butter;

and regularly checking whether the turn buckle is rusted or loosened.

2. The novel flower basket pull rod tool type overhanging frame construction method according to claim 1, characterized in that: the construction method comprises the following steps of learning an engineering building structure construction drawing, compiling a cantilever frame and scaffold construction organization design, determining the segmented height of the scaffold according to the construction drawing, wherein each segment is not more than 20m, determining the longitudinal distance between the cantilever frames along a building, determining the use type of the cantilever frame, including the number of common types, lengthened types and overlong types, when finding that the field condition is inconsistent with the design type, timely communicating and coordinating with a technical department, modifying the design, and drawing a cantilever scaffold arrangement plan view and a sectional view on the basis to serve as one of construction organization contents.

3. The novel flower basket pull rod tool type overhanging frame construction method according to claim 1, characterized in that: blanking and welding an iron plate at the end part of the I-shaped steel in the second step;

drawing a processing plan according to the length of the selected 16# I-steel and the size and thickness of the iron plate, performing bottom crossing on workers, cutting and blanking by oxygen on site, and meanwhile, entrusting a processing factory to perform finished product processing;

(1) taking an I-shaped steel with the length of 1.5 meters, welding a phi 22 x 30 mm reinforcing head at a position 10 cm away from the front end of the I-shaped steel to stabilize the vertical rod of the scaffold, welding a 100 x 12 mm iron plate at a position 15 cm away from the welding reinforcing head, welding a 200 x 220 x 12 mm iron plate at the tail end of the steel with the I-shaped steel, and welding the hole pitch of 110 mm;

(2) machining a turn buckle;

performing blanking cutting according to the shape, size and specification of the selected bolt after calculation of the scheme, drawing a processing plan of the turn buckle, and performing on-site processing after bottom intersection on workers;

carrying out double-sided welding on phi 20X 1.6 m and phi 20X 1.0 m high-quality carbon steel and three phi 14 high-quality carbon steels, and assembling and mounting machined and formed turn-buckle bolts;

(3) manufacturing and welding a pull rod;

drawing a processing plane diagram of the upper pull rod, the lower pull rod and the ear plate, performing bottom crossing on a worker, cutting and blanking on site, bending the upper end phi 20 x 1.6 m carbon high-quality steel and the 250 x 10 x 12 mm iron plate into 20 degrees, punching and cutting the groove pitch according to the floor surface, further performing groove welding, determining the lower end phi 20 x 1.0 m carbon high-quality steel and the 250 x 10 mm iron plate according to the floor surface, punching and cutting the groove pitch, wherein the groove pitch is 20 x 100, and further performing groove welding.

4. The novel flower basket pull rod tool type overhanging frame construction method according to claim 1, characterized in that: after the top plate template is erected and before the beam outer die is closed, a positioning line is accurately released on the template surface according to a limited scaffold I-steel plane layout drawing,

upper end: embedding a 25 x 200 mm sleeve at the corresponding position of the upper storey of the I-shaped steel cantilever, sealing two ends of the sleeve by using adhesive tapes, and welding the sleeve on the beam and the wall column;

lower end: embedding a high-strength bolt sleeve before cantilever by adopting a phi 25 x 200 mm hollow steel pipe, sealing two ends by using adhesive tapes, embedding the hollow steel pipe into a steel bar binding beam and a wall column for welding and fixing, and embedding a 200 x 220 x 12 mm iron plate at a corner;

after the sleeve is pre-buried, a specially-assigned person is dispatched to recheck the planar arrangement size and the height position of the sleeve, so that the position deviation of the sleeve is reduced to the minimum;

in the concrete pouring process, a specially-assigned person is required to perform tracking operation, blanking is strictly forbidden at the position with the embedded casing, and in the vibrating process, an operator strictly forbids collision on the casing.

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