CN116971579A - Construction method of upward-pulling tool type overhanging scaffold - Google Patents

Abstract

The invention discloses a construction method of a pull-up tool type cantilever scaffold, which comprises the following steps: s1, arranging overhanging steel beams; s2, mounting a vertical rod; s3, mounting a cross bar; s4, installing a pull rod; s5, installing a wall connecting piece; s6, setting a scissor support; s7, setting a transverse inclined rod; s8, arranging a scaffold board and a skirting board; s9, hanging a safety net fully; s10, setting a safety net; s11, setting skirting boards; s12, sealing the overhanging bottom layer, and fixing overhanging I-steel on the outer side of the structural boundary beam through pre-buried high-strength bolts. The wall connecting piece is a novel turnover wall connecting piece which is the same as the overhanging I-steel, the wall connecting piece is not required to be perforated on a wall body, hidden leakage hazards are effectively avoided, the steel pipe can be reused, only the plastic sleeve and the nut are required to be consumed, the cost is saved, and the construction is simple.

Description

Construction method of upward-pulling tool type overhanging scaffold

Technical Field

The invention relates to the technical field of building construction, in particular to a construction method of a pull-up tool type cantilever scaffold.

Background

The assembled building is taken as a product of the development of the building industry, and has great development prospect when green low-carbon transformation and sustainable development are realized at present. The multi-layer assembled building outer frame considers the multi-purpose outer scaffold that encorbelments of construction cost, and traditional outer scaffold that encorbelments needs the wall body to open the hole, has very big hidden danger to later stage waterproof.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a construction method of a pull-up tool type cantilever scaffold, which comprises the following steps:

s1, cantilever steel beam setting: according to the set longitudinal distance of the outer frame, each longitudinal distance is provided with a cantilever steel beam, and the longitudinal distance is smaller than 1.5m;

s2, mounting a vertical rod: the vertical rods are required to be placed on the short steel bars of the overhanging steel beam, and the distance between two separated joints of one vertical rod in the height direction is not less than 500mm;

s3, mounting a cross bar, wherein the cross bar comprises a longitudinal mounting horizontal bar and a transverse mounting horizontal bar;

s4, installing a pull rod, wherein the pull rod comprises an upper pull rod and a lower pull rod, the upper pull rod is connected with a steel plate, double-sided fillet welds are connected with the structure by adopting M20-8.8-level high-strength bolts, a-8X 80 steel plate is internally and externally added, and a double-nut matched anti-loosening gasket is externally added;

s5, installing a wall connecting piece: the cantilever frame and the building adopt a turnover novel embedded wall connecting piece, and the novel embedded wall connecting piece comprises an embedded piece, an M16 connecting screw rod and a wall connecting fastener;

s6, setting a scissor support;

s7, setting a transverse diagonal rod: the transverse diagonal rods are arranged continuously in a shape of a Chinese character 'ji' from bottom to top and are arranged at the large-angle corner part of the outer frame and at the two ends of the independent outer frame of the construction elevator, each diagonal rod spans 1 step distance, and one transverse diagonal rod is arranged in the middle of the scaffold at intervals of 6 steps;

s8, arranging a scaffold board and a skirting board: constructing a scaffold plate at the bottom of the scaffold by adopting a template according to a sealing method;

s9, hanging a safety net fully: fully-hanging a fully-closed dense-mesh safety net on a scaffold: a horizontal pocket net is hung at the lower part of the operation layer, a first layer of flat net is arranged at the first step of the scaffold, a layer of flat net is arranged at the next step of fully paving the scaffold board upwards, and a construction layer is arranged along with the layer;

s10, setting a safety pocket net: the working layer and the next layer of the working layer, the second layer of the floor frame, the middle layer of the floor frame is not more than 10 meters, and not more than three layers of the floor frame are required to be fully sealed by a safety net, and the outer vertical surface of the scaffold is fully sealed by a dense safety net;

s11, setting skirting boards: binding iron wires on a frame body, transversely overhanging the frame body, arranging a skirting board in two steps, arranging the skirting board at all vertical external corners, and brushing red and white paint on the skirting board;

s12, sealing the overhanging bottom layer: and sealing and nailing the whole plane range between the outer upright rod and the building structure by using a template at the bottom of each overhanging layer and the first step of a layer of frame, wherein the construction load on the operation layer is not more than 2 KN/square meter.

Preferably, step S1 comprises the steps of:

s11, drilling holes in the arranged I-steel positions after the side beam templates are paved, and embedding 2M 20 high-strength bolts;

s12, pouring concrete after acceptance, and removing the mould after the strength reaches the requirement. Installing 16# overhanging I-steel through bolts;

s13, welding 2 phi 25 short steel bar heads with the height of 150mm on I-steel at the vertical rod position to fix the bottom of the vertical rod;

s14, when the cantilever steel beam is anchored on the balcony outer beam or the cantilever length is larger than 1.8m, setting a vertical rod back top at the lower opening of the I-steel.

Preferably, in step S2, the vertical rod is lengthened, and the joints of the other layers except the top layer top step must be linked by adopting butt joint fasteners, when the top layer top step vertical rod is lengthened by adopting lap joint, the lap joint length should not be less than 1m, and the distance from the edge of the end fastener cover plate to the rod end should not be less than 100mm, and the two ends should be fixed by adopting at least 2 rotation fasteners.

Preferably, step S3 comprises the steps of:

s31, staggered arrangement of butt joint fasteners of the longitudinal horizontal rods: joints of two adjacent longitudinal horizontal rods are not suitable to be arranged in a synchronous or same span, the distance of the two adjacent joints which are not synchronous or different spans and staggered in the horizontal direction is not less than 500mm, and the distance from the center of each joint to the nearest main node is not more than 500mm; when lap joint is needed, the length of the lap joint is not less than 1.5m, not less than 3 rotary fasteners are arranged equidistantly for fixation, the distance from the edge of the cover plate of the end fastener to the rod end is not less than 100mm, and the length of the longitudinal horizontal rod is generally not less than 3 spans and not less than 6m;

s32, a transverse horizontal rod is arranged at each main node, the transverse horizontal rods are buckled below the longitudinal horizontal rods by right-angle fasteners and are strictly forbidden to be removed, the center distance between the two right-angle fasteners at the main nodes is not more than 150mm, in a double-row scaffold, the length of the transverse horizontal rods extending to the outer side is not less than 100mm, the extending length of one end of a wall is not more than 500mm, the transverse horizontal rods at non-main nodes on an operation layer are arranged at equal intervals according to the requirement of a supporting scaffold board, and the maximum interval is not more than 750mm of the longitudinal distance.

Preferably, step S4 comprises the steps of:

s41, after the upper layer of concrete to be overhung reaches the required strength, removing the side die, penetrating out the high-strength bolt with the gasket from inside to outside, and fastening the lug plate of the upper pull rod with the gasket of the high-strength bolt with double nuts;

s42, preliminarily fixing the lower pull rod and the lifting lug on the I-steel by using a gasket and a double bolt;

s43, butting a pull rod bolt hole with a lower pull rod wire hole, continuously rotating, loosening a lug plate screw, penetrating the pull rod bolt into an upper pull rod screw, rotating until the pull rod bolt is not rotated, and rotating the pull rod bolt by a tool until the lower pull rod lug plate and the I-steel lug plate just can extend into the high-strength bolt, penetrating the bolt and the accessory in time, and screwing the bolt;

s44, rotating the pull rod bolt to a rotation-proof position by using a tool, and finishing the installation of the upper pull rod and the lower pull rod after the pull rod is confirmed to be screwed. The corner, the balcony and the overhanging I-steel are provided with double pull rods at the length exceeding 1.8m, and the other parts are provided with single pull rods.

Preferably, step S5 comprises the steps of:

s51, drilling a hole with the diameter of 30mm by using a professional hole according to the design position, and fixedly binding the fastening embedded part and the steel bar together;

s52, after the fastener is installed and fixed, pouring concrete, removing the side beam side mould after the concrete pouring is completed and the demoulding condition is reached, installing an M16 screw rod and a wall connecting fastener, after the fastener bolts are screwed up, performing spot check by using a torque wrench, wherein the distance between the central line of a fixed longitudinal horizontal rod, a fixed transverse scissor support and the like and the main joint is not more than 150mm; .

S53, the cantilever frames are embedded with the layers according to three spans, the scaffold must be erected according to the construction progress, the erection height of the scaffold should not exceed two steps above the adjacent wall connecting pieces, and after one step of scaffold is erected, the step pitch, the longitudinal pitch, the transverse pitch and the verticality of the vertical rod should be corrected according to the standard requirements.

S54, setting up at the corner of the tower, at the edge of the construction elevator and the frame body, setting up wall connecting pieces according to each layer and each upright rod, preferably setting up near the main node, and keeping the distance away from the main node not more than 300mm.

S55, setting from the longitudinal horizontal rod of the first step of the bottom layer, wherein the arrangement is preferably diamond, or square or rectangular.

S56, arranging wall connecting rods at two ends of the straight-shaped and open-type scaffold, wherein the vertical distance of the wall connecting rods is not larger than the floor height of a building, and the spans are arranged according to three spans.

S57, adopting anti-overturning measures when a wall connecting piece cannot be arranged at the lower part of the scaffold, adopting a through long rod piece for throwing and supporting when the throwing and supporting is arranged, and fixing the through long rod piece on the scaffold by using a rotary fastener, wherein the inclination angle between the through long rod piece and the ground is 45-60 degrees; the connection point center to primary node distance should not be greater than 300mm.

Preferably, step S6 comprises the steps of:

s61, the width of each scissor brace is not smaller than 4 spans and not smaller than 6m, and the inclination angle of the inclined rod and the ground is 45-60 degrees;

s62, splicing or butt joint is adopted for splicing the diagonal rods of the scissors, and when splicing is adopted, the splicing length is not less than 1m and is fixed by not less than 3 rotary fasteners;

s63, fixing the diagonal rods of the scissor braces on the extending ends or the vertical rods of the transverse horizontal rods intersecting with the diagonal rods by using a rotary fastener, wherein the distance from the central line of the rotary fastener to a main joint is not more than 150mm;

s64, setting up synchronous arrangement along with the outer frame on the scissors support; double-row scaffold should be provided with scissors support continuously on outer full-elevation

Preferably, step S8 comprises the steps of:

s81, the scaffold boards of the operation layer are fully paved layer by layer, are stably paved and are 150mm away from the wall surface, and the scaffold boards are arranged on four transverse horizontal rods. The scaffold boards are laid in a butt joint and are laid in a flat mode, two transverse horizontal rods are arranged at joints when the scaffold boards are in butt joint and are laid in a flat mode, the outer extension of the scaffold boards is 150mm, and the sum of the extension lengths of the two scaffold boards is 300mm.

S82, adopting steel basketry piece scaffold boards, binding by adopting no less than 16# iron wires, and binding the two sides of each scaffold board by no less than 3, and binding the middle by no less than 1. The scaffold board is fully paved, stably paved and solid paved according to each step, the length of the probe of the scaffold board at the end part of the working layer is 150mm, and both ends of the scaffold board are fixed on the support rod pieces.

The beneficial effects of the invention are as follows:

(1) The upward-pulling tool type cantilever scaffold is mainly fixed on a building structure main body by using high-strength bolts and a shaping steel beam, and a procedure of arranging an anchoring section in a floor plate can be omitted, so that the amount of I-steel required in the construction process is greatly reduced, and the material consumption can be saved by about 55.56%. Meanwhile, the design has relatively fewer reserved holes in the actual operation process, the structure of the fabricated building cannot be damaged, the secondary plugging of the wall penetrating hole is not needed, the condition that the traditional I-steel embedded part needs to be cut on site can be avoided, the hidden danger of floor water seepage and water leakage is effectively avoided, and the engineering quality is ensured. And prefabricated side fascia has 20 mm thick seat thick with the floor thick doing, and traditional girder steel of encorbelmenting probably leads to seat thick disconnection, leads to the fact certain influence to assembled structural stability, and novel frame anchor of encorbelmenting then can not receive this influence on the structure boundary beam. If the overhanging section steel anchoring part is a prefabricated part, the prefabricated part is produced in a centralized and standardized manner in a factory, and the strength of the prefabricated part reaches the design requirement when the prefabricated part leaves a factory.

(2) The traditional wall connecting piece is pre-embedded at the upper opening part of the boundary beam, and for the part with the shear wall/column, a holding frame or a wall penetrating pre-embedding is generally used; for the position with the masonry wall, temporary holes are needed to be reserved when the subsequent wall is built, the repair is carried out in a plastering stage, when the skill of workers is common, the repair quality of the shear wall, the column or the masonry wall position is often not guaranteed, the forming quality is poor if the shear wall is light, the impression is not guaranteed, the reserved holes are not tightly plugged if the shear wall is heavy, leakage hidden danger exists, and the repair difficulty of the leakage of the outer wall is heavy due to the fact that the leakage of the outer wall is caused by excessive building layers, so that the living environment of owners is seriously influenced. In the construction process, the wall connecting piece is frequently dismantled by workers at will, so that the wall connecting piece cannot be reinforced in time, and great potential safety hazards exist. Can have enough to meet need novel pre-buried wall spare that links, the direct fixation is in the roof beam side, need not to open the hole to the wall body, avoids later stage entrance to a cave to repair the quality relatively poor, and the impression can not be guaranteed. The hidden trouble of leakage in the later stage is avoided to a great extent without opening holes. The wall connecting piece does not need to be embedded with steel pipes, namely the steel pipes do not need to be cut off in the later period, the turnover recycling is convenient, and only the sleeve and the nut are needed.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:

fig. 1 is a large sample view of a pull-up tool type cantilever scaffold of the invention;

FIG. 2 is a node diagram of the steel beam and structure connection of the present invention;

FIG. 3 is a node diagram of the upper tie rod and structure connection of the present invention;

FIG. 4 is a node diagram of the invention's tie down bar to steel beam connection;

fig. 5 is a drawing of a tie rod node map of the present invention.

In the figure: 01. a building; 1. a high-strength bolt of A20; 2. 16# overhanging I-steel; 3. an end plate; 4. -8 x 80 steel plate washer; 5. a double nut; 6. short steel bar heads; 7. standing the pole and returning to the top; 8. a vertical rod; 9. a transverse horizontal bar; 10. a longitudinal horizontal bar; 11. a pull rod; 12. ear plates; 13. m20-8.8 grade high-strength bolts; 14. a50×20 round steel; 15. high-quality carbon steel; 16. a pull-down rod; 17. lifting lugs; 18. an embedded part; 19. m16 is connected with a screw rod; 20. wall connecting fasteners; 21. a steel pipe; 22. a template; 23. a steel basketry piece scaffold board; 24. a dense mesh safety net; 25. skirting board.

Detailed Description

The technical scheme of the invention is described in detail below through the drawings, but the protection scope of the invention is not limited to the embodiments.

Referring to fig. 1 to 5, the construction method of the cantilever scaffold with a pull-up tool of the present invention specifically includes the following steps:

(1) Cantilever steel beam setting: according to the set longitudinal distance of the outer frame, each longitudinal distance is provided with a cantilever steel beam, and the longitudinal distance is smaller than 1.5m.

Step 1.1: after the side beam template is paved, drilling holes in the arranged I-steel positions, and embedding 2A 20 high-strength bolts 1.

Step 1.2: pouring concrete after acceptance, and removing the mould after the strength reaches the requirement. And installing the 16# overhanging I-steel 2 through bolts. The I-steel has end plate 3 with building 01 juncture, end plate 3 specification: 180 wide x 200 high x 8 thick steel plates, horizontal slotted holes are formed in the holes of the end plates 3, horizontal construction errors of the embedded iron pipes are convenient to adjust, fillet girth welding is adopted for connection of the I-steel 2 and the end plates 3, and the height of welding legs is 6mm. The inner side of the structure is provided with a-8 multiplied by 80 steel plate gasket 4, the outer side is provided with a double nut 5 matched with a locking gasket, and the length of the external leakage wire of the nut is not less than 3 wires and 10mm.

Step 1.3: 2 phi 25 short steel bar heads 6 with the height of 150mm are welded on I-steel at the vertical rod position and fixed at the bottom of the vertical rod.

Step 1.4: when the overhanging steel beam is anchored on the balcony outer beam or the overhanging length is more than 1.8m, the lower opening of the I-shaped steel beam is provided with a vertical rod back-roof 7.

(2) And (5) installing a vertical rod.

Step 2.1: the transverse distance of the vertical rods 8 is 0.8m, the longitudinal distance is 1.5m, the step distance is 1.8m, in erection, the vertical rods 8 are required to be placed on short steel bars of overhanging steel beams, the joint positions of two adjacent vertical rods 8 are required to be staggered and arranged in different step distances, and the distance between the joint positions and the large cross rod 10 is not required to be larger than one third of the step distance.

Step 2.2: the upright rod 8 and the large cross rod 10 are fastened by right-angle fasteners, so that the bearing capacity of the upright rod is ensured, and the upright rod cannot be arranged or omitted in a step-by-step manner.

Step 2.3: the vertical deviation of the vertical rod 8 is controlled according to 1/400 of the height so that the total height deviation is not more than 10cm.

Step 2.4: the upright rod 8 is lengthened, except the top step of the top layer, all the joints of the other layers are connected by adopting butt-joint fasteners, and the upright rod 8 is connected with the large cross rod 10 by adopting right-angle fasteners. The joint positions are staggered, two adjacent upright rod joints are prevented from being in synchronous same span, and the staggered distance in the height direction is not less than 50cm; the distance between the centers of the joints and the main node is not more than 1/3 of the step distance, when the top step of the top layer adopts lap joint, the lap joint part is tied up at least 3 times, and the top end of the vertical rod is higher than the structure by 1m (the cornice position is erected to the upper part of the cornice by 1.5 m).

(3) And (5) installing a cross bar.

Step 3.1: a longitudinal horizontal bar (large cross bar) 10 is installed. The butt-joint fasteners of the longitudinal horizontal rods 10 are staggered: joints of two adjacent longitudinal horizontal rods 10 are not suitable to be arranged in the same synchronous or same span, the offset distance of the two adjacent joints in the horizontal direction of the asynchronous or different spans is not less than 500mm, the distance from the center of each joint to the nearest main node is not suitable to be more than 500mm, and the joints are not suitable to be arranged in the span of the longitudinal horizontal rods 10; when the lap joint is necessary, the length of the lap joint should not be less than 1.5m, and the lap joint should be fixed by equidistantly arranging not less than 3 rotary fasteners, and the distance from the edge of the cover plate of the end fastener to the rod end should not be less than 100mm. The length of the longitudinal horizontal bar 10 is generally not less than 3 spans and not less than 6m.

Step 3.2: a transverse horizontal bar (small cross bar) 9 is installed. A transverse horizontal bar 9 must be provided at each main node and fastened under the longitudinal horizontal bar with right angle fasteners and the removal is strictly forbidden. The center distance of the two right-angle fasteners at the main node is not more than 150mm. In the double-row scaffold, the length of the transverse horizontal rod 9 extending to the outer side is more than or equal to 100mm, and the extending length of one end close to the wall is not more than 500mm. The transverse horizontal rods 9 on the working layer at the non-main nodes are preferably arranged at equal intervals according to the requirements of the supporting scaffold boards, and the maximum interval is not more than 750mm of the longitudinal distance.

(4) Mounting pull rod

The upper pull rod 11 has the specification A20, the length of the thread section is 300mm, the upper pull rod 11 is connected with a thick steel plate 12 with the width of 100mm, the height of 250 mm and the thickness of 12mm, double-sided fillet welds are welded with the length of 100mm, and the height of a welding leg is 6mm and the thickness is 12mm. The anti-loosening device is connected with a structure by adopting M20-8.8 high-strength bolts 13, wherein-8X 80 gaskets 4 are added inside and outside, double nuts 5 are added outside and matched with anti-loosening gaskets, and the length of the external leakage wire of the nuts is not less than 3 wires and 10mm. Sleeve specification: a50×20 round steel 14, material number 45 steel, welded with three high quality carbon steels 15, round steel specification: a14, welding the round steel with double-sided fillet weld, wherein the welding length is 60mm, and the height of the welding leg is 8mm.

Step 4.1: after the upper layer of overhanging concrete reaches the required strength, the side mould is dismantled, the high-strength bolt 13 and the gasket are penetrated out from inside to outside, and the lug plate 12 of the upper pull rod 11 and the gasket and the double nut of the high-strength bolt 13 are fastened.

Step 4.2: the lower pull rod 16 (the specification is the same as that of the upper pull rod 11) and the lifting lug 17 on the I-steel are preliminarily fixed by using the gasket 4 and the M20 high-strength bolt, and the specification of the lifting lug 17 is-12 multiplied by 150mm steel plate.

Step 4.3: the pull rod bolt hole is in butt joint with a 16 wire opening of the lower pull rod and continuously rotates, then the lug plate screw is loosened, the pull rod bolt is penetrated into the upper pull rod screw thread and then rotates until the pull rod bolt is fixed, and then the pull rod bolt is rotated by a tool until the lower pull rod lug plate and the I-steel lug plate just can extend into the high-strength bolt, and then the bolt and the accessory are penetrated in time and the bolt is screwed.

Step 4.4: and finally, rotating the pull rod bolt to a rotation-proof position by using a tool, and finishing the installation of the upper pull rod and the lower pull rod after the pull rod is confirmed to be screwed. The corner, the balcony and the overhanging I-steel are provided with double pull rods at the length exceeding 1.8m, and the other parts are provided with single pull rods.

(5) And installing a wall connecting piece.

The cantilever frame and the building adopt a turnover novel embedded wall connecting piece, and the novel embedded wall connecting piece mainly comprises an embedded piece 18, an M16 connecting screw 19 and a wall connecting fastener 20.

Step 5.1: according to the design position, a hole with the diameter of 30mm is drilled by a professional hole, and the fastening embedded part 18 and the steel bars are fixedly bound together.

Step 5.2: after the fasteners 18 are installed and secured, concrete is poured. During the vibration process, the position of the wall connecting piece is avoided, and the fastener 18 is found to be loose and fall off to reset immediately. And after the concrete pouring is completed and the demolding condition is reached, removing the side mold of the side beam, installing an M16 connecting screw 19 and a wall connecting fastener 20, and connecting and fixing the steel pipe 21 with the outer frame upright rod 8 through the wall connecting fastener 20. The specification phi of the fastener is 48mm, which is the same as the outer diameter of the steel pipe; after the fastening bolt is screwed, the torque wrench is used for spot check, and the torque distance is not smaller than 40 N.m and not larger than 60 N.m; the distance between the central line of the fixed longitudinal horizontal rod, the fixed transverse scissors support and the fixed transverse scissors support is not more than 150mm; the length of each rod end extending out of the edge of the fastener cover plate is not less than 100mm. The opening of the butt-joint fastener should be upward or inward. The extension of the wall connecting piece out of the outer frame is larger than or equal to 100mm.

Step 5.3: the cantilever frame is embedded with the layer according to three spans, the scaffold must be erected according to the construction progress, the erection height should not exceed two steps above the adjacent wall connecting pieces at one time, and after one step of scaffold is erected, the step distance, the longitudinal distance, the transverse distance and the verticality of the vertical rod should be corrected according to the standard requirements.

Step 5.4: the corner of the tower, the construction elevator and the edge of the frame body are all required to be arranged, and the wall connecting piece is arranged according to each layer and each upright rod. Preferably, the distance from the main node should not be greater than 300mm.

Step 5.5: should be set from the first step of the bottom layer at the longitudinal horizontal bar. Preferably, diamond arrangement is adopted, and square and rectangular arrangement can be adopted.

Step 5.6: the two ends of the straight-shaped and open-type scaffold are required to be provided with wall connecting rods, the vertical distance of the wall connecting pieces is not larger than the floor height of a building, and the span is arranged according to three spans.

Step 5.7: when the lower part of the scaffold can not be provided with a wall connecting piece, an anti-overturning measure is adopted. When the throwing support is erected, the throwing support is a through long rod piece and is fixed on the scaffold by a rotary fastener, and the inclination angle between the throwing support and the ground is 45-60 degrees; the connection point center to primary node distance should not be greater than 300mm. The throwing support should be removed after the wall connecting piece is erected.

(6) Setting up a scissors support

Step 6.1: the width of each shear stay is not less than 4 spans and not less than 6m, and the inclination angle of the inclined rod and the ground is between 45 degrees and 60 degrees.

Step 6.2: the extension of the diagonal rods of the scissors stay adopts lap joint or butt joint, and when the lap joint extension is adopted, the lap joint length is not less than 1m and is fixed by adopting not less than 3 rotary fasteners.

Step 6.3: the diagonal rods of the scissor braces are fixed on the extending ends or the vertical rods of the transverse horizontal rods intersecting with the diagonal rods by using rotary fasteners, and the distance from the central line of each rotary fastener to the main joint should not be more than 150mm.

Step 6.4: the scissors support is synchronously arranged along with the outer frame. The double-row scaffold is provided with a scissor support on the outer side in a full-elevation manner.

(7) Set up horizontal diagonal bar

Step 7.1: the transverse diagonal braces are arranged continuously in a shape of a Chinese character 'ji' from bottom to top among the same joints.

Step 7.2: the transverse diagonal bracing is arranged at the large-angle corner part of the outer frame and two ends of the independent outer frame of the construction elevator, and each diagonal rod spans 1 step distance. And a transverse diagonal brace is arranged in the middle of the scaffold every 6 spans.

(8) Setting scaffold board and skirting board

Step 8.1: the scaffold bottom scaffold plate is constructed by adopting a template 22 according to a closed method. The scaffold boards of the working layer are fully paved layer by layer, and are stably paved and are 150mm away from the wall surface. The scaffold boards should be arranged on four transverse horizontal rods. The scaffold boards are laid in a butt joint and tiling way. When the scaffold boards are in butt joint and are tiled, two transverse horizontal rods are required to be arranged at the joint, 150mm of external extension of the scaffold boards is required, and the sum of the extension lengths of the two scaffold boards is 300mm.

Step 8.2: the steel basketry sheet scaffold plates 23 are adopted, binding is not less than 16# iron wires, binding positions at two sides of each scaffold plate are not less than 3, and binding positions at the middle are not less than 1. The scaffold board is fully paved, stably paved and solid paved according to each step, the length of the probe of the scaffold board at the end part of the working layer is 150mm, and both ends of the scaffold board are fixed on the support rod pieces.

(9) Full hanging safety net

The scaffold is fully hung with a totally-enclosed dense mesh safety net 24, the dense mesh net adopts the specification of 1.8m multiplied by 6.0m, and is bound on the inner side of the outer upright rod of the large cross rod by 16# iron wires. The lower part of the working layer is hung with a horizontal pocket net, a first layer of flat net is arranged at the first step of the scaffold, a layer of flat net is arranged at the next step of fully paving the scaffold board upwards, and the construction layer is arranged with the net along with the layer.

(10) Safety net

The working layer and the next layer of the working layer, the second layer of the floor stand, the middle layer not more than 10 meters and not more than three layers are all sealed by a safety net. The outer facade of the scaffold is fully sealed by adopting a dense safety net.

(11) Skirting board

Iron wires are bound on the frame body, a skirting board 25 is arranged in two steps of transverse overhanging, the skirting board 25 is arranged at all vertical external corners, and the skirting board is painted with red and white paint.

(12) The overhanging bottom layer is closed

Sealing and nailing the whole plane range between the outer upright rod and the building structure by using a template at the bottom of each overhanging layer and the first step of a layer of frame, so that the object is not likely to fall at the position, and the safety is ensured; the construction load on the operation layer should not exceed 2 KN/square meter.

The invention has lighter weight in the process of setting up and dismantling the outer frame, lighter construction and better guarantee of construction safety. If the wall connecting pieces are all made in a shaping way, the wall connecting pieces can be used in a plurality of times, the loss rate of the main materials is extremely low, the cost is effectively reduced, and the wall connecting pieces are attractive and practical. And the interior decoration is not influenced, the outer wall repair is simpler, the hidden trouble of leakage is avoided, the construction period is shortened, and great construction period benefit is generated.

As above, although the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. The construction method of the upward-pulling tool type overhanging scaffold is characterized by comprising the following steps of:

s1, cantilever steel beam setting: according to the set longitudinal distance of the outer frame, each longitudinal distance is provided with a cantilever steel beam, and the longitudinal distance is smaller than 1.5m;

s2, mounting a vertical rod: the vertical rods are required to be placed on the short steel bars of the overhanging steel beam, and the distance between two separated joints of one vertical rod in the height direction is not less than 500mm;

s3, mounting a cross bar, wherein the cross bar comprises a longitudinal mounting horizontal bar and a transverse mounting horizontal bar;

s4, installing a pull rod, wherein the pull rod comprises an upper pull rod and a lower pull rod, the upper pull rod is connected with a steel plate, double-sided fillet welds are connected with the structure by adopting M20-8.8-level high-strength bolts, a-8X 80 steel plate is internally and externally added, and a double-nut matched anti-loosening gasket is externally added;

s5, installing a wall connecting piece: the cantilever frame and the building adopt a turnover novel embedded wall connecting piece, and the novel embedded wall connecting piece comprises an embedded piece, an M16 connecting screw rod and a wall connecting fastener;

s6, setting a scissor support;

s7, setting a transverse diagonal rod: the transverse diagonal rods are arranged continuously in a shape of a Chinese character 'ji' from bottom to top and are arranged at the large-angle corner part of the outer frame and at the two ends of the independent outer frame of the construction elevator, each diagonal rod spans 1 step distance, and one transverse diagonal rod is arranged in the middle of the scaffold at intervals of 6 steps;

s8, arranging a scaffold board and a skirting board: constructing a scaffold plate at the bottom of the scaffold by adopting a template according to a sealing method;

s9, hanging a safety net fully: fully-hanging a fully-closed dense-mesh safety net on a scaffold: a horizontal pocket net is hung at the lower part of the operation layer, a first layer of flat net is arranged at the first step of the scaffold, a layer of flat net is arranged at the next step of fully paving the scaffold board upwards, and a construction layer is arranged along with the layer;

s10, setting a safety pocket net: the working layer and the next layer of the working layer, the second layer of the floor frame, the middle layer of the floor frame is not more than 10 meters, and not more than three layers of the floor frame are required to be fully sealed by a safety net, and the outer vertical surface of the scaffold is fully sealed by a dense safety net;

s11, setting skirting boards: binding iron wires on a frame body, transversely overhanging the frame body, arranging a skirting board in two steps, arranging the skirting board at all vertical external corners, and brushing red and white paint on the skirting board;

s12, sealing the overhanging bottom layer: and sealing and nailing the whole plane range between the outer upright rod and the building structure by using a template at the bottom of each overhanging layer and the first step of a layer of frame, wherein the construction load on the operation layer is not more than 2 KN/square meter.

2. The construction method of the cantilever scaffold with the pull-up tool as claimed in claim 1, wherein the construction method comprises the following steps: step S1 comprises the steps of:

s11, drilling holes in the arranged I-steel positions after the side beam templates are paved, and embedding 2M 20 high-strength bolts;

s12, pouring concrete after acceptance, removing the mould after the strength reaches the requirement,

installing 16# overhanging I-steel through bolts;

s13, welding 2 phi 25 short steel bar heads with the height of 150mm on I-steel at the vertical rod position to fix the bottom of the vertical rod;

s14, when the cantilever steel beam is anchored on the balcony outer beam or the cantilever length is larger than 1.8m, setting a vertical rod back top at the lower opening of the I-steel.

3. The construction method of the cantilever scaffold with the pull-up tool as claimed in claim 1, wherein the construction method comprises the following steps: in the step S2, the vertical rod lengthening is performed except the top layer top step, all the joints of all the other layers are necessarily connected by adopting butt joint fasteners, when the top layer top step vertical rod is performed by adopting lap joint lengthening, the lap joint length is not less than 1m, the vertical rod lengthening is fixed by adopting at least 2 rotary fasteners, and the distance from the edge of the end fastener cover plate to the rod end is not less than 100mm.

4. The construction method of the cantilever scaffold with the pull-up tool as claimed in claim 1, wherein the construction method comprises the following steps: step S3 includes the steps of:

s31, staggered arrangement of butt joint fasteners of the longitudinal horizontal rods: joints of two adjacent longitudinal horizontal rods are not suitable to be arranged in a synchronous or same span, the distance of the two adjacent joints which are not synchronous or different spans and staggered in the horizontal direction is not less than 500mm, and the distance from the center of each joint to the nearest main node is not more than 500mm; when lap joint is needed, the length of the lap joint is not less than 1.5m, not less than 3 rotary fasteners are arranged equidistantly for fixation, the distance from the edge of the cover plate of the end fastener to the rod end is not less than 100mm, and the length of the longitudinal horizontal rod is generally not less than 3 spans and not less than 6m;

s32, a transverse horizontal rod is arranged at each main node, the transverse horizontal rods are buckled below the longitudinal horizontal rods by right-angle fasteners and are strictly forbidden to be removed, the center distance between the two right-angle fasteners at the main nodes is not more than 150mm, in a double-row scaffold, the length of the transverse horizontal rods extending to the outer side is not less than 100mm, the extending length of one end of a wall is not more than 500mm, the transverse horizontal rods at non-main nodes on an operation layer are arranged at equal intervals according to the requirement of a supporting scaffold board, and the maximum interval is not more than 750mm of the longitudinal distance.

5. The construction method of the cantilever scaffold with the pull-up tool as claimed in claim 1, wherein the construction method comprises the following steps: step S4 includes the steps of:

s41, after the upper layer of concrete to be overhung reaches the required strength, removing the side die, penetrating out the high-strength bolt with the gasket from inside to outside, and fastening the lug plate of the upper pull rod with the gasket of the high-strength bolt with double nuts;

s42, preliminarily fixing the lower pull rod and the lifting lug on the I-steel by using a gasket and a double bolt;

s43, butting a pull rod bolt hole with a lower pull rod wire hole, continuously rotating, loosening a lug plate screw, penetrating the pull rod bolt into an upper pull rod screw, rotating until the pull rod bolt is not rotated, and rotating the pull rod bolt by a tool until the lower pull rod lug plate and the I-steel lug plate just can extend into the high-strength bolt, penetrating the bolt and the accessory in time, and screwing the bolt;

s44, rotating the pull rod bolt to a rotation-proof position by using the tool, and finishing the installation of the upper pull rod and the lower pull rod after the pull rod is confirmed to be screwed up,

the corner, the balcony and the overhanging I-steel are provided with double pull rods at the length exceeding 1.8m, and the other parts are provided with single pull rods.

6. The construction method of the cantilever scaffold with the pull-up tool as claimed in claim 1, wherein the construction method comprises the following steps: step S5 includes the steps of:

s51, drilling a hole with the diameter of 30mm by using a professional hole according to the design position, and fixedly binding the fastening embedded part and the steel bar together;

s52, after the fastener is installed and fixed, pouring concrete, removing the side beam side mould after the concrete pouring is completed and the demoulding condition is reached, installing an M16 screw rod and a wall connecting fastener, after the fastener bolts are screwed up, performing spot check by using a torque wrench, wherein the distance between the central line of a fixed longitudinal horizontal rod, a fixed transverse scissor support and the like and the main joint is not more than 150mm;

s53, embedding the stretching frame along with the layer according to three spans, setting up the scaffold according to the construction progress, setting up the scaffold at a time to ensure that the height does not exceed that of two adjacent wall connecting pieces, and correcting the step pitch, the longitudinal pitch, the transverse pitch and the verticality of the vertical rod according to the standard requirement after setting up one step of scaffold;

s54, setting at the corner of the tower, the construction elevator and the edge of the frame body, wherein wall connecting pieces are arranged according to each layer and each upright rod, and are preferably arranged close to the main node, and the distance away from the main node is not more than 300mm;

s55, setting from the longitudinal horizontal rod of the first step of the bottom layer, wherein the arrangement is preferably diamond-shaped, or square or rectangular;

s56, arranging wall connecting rods at two ends of the straight-shaped and open-type scaffold, wherein the vertical distance of the wall connecting rods is not larger than the layer height of a building, and the spans are arranged according to three spans;

s57, adopting anti-overturning measures when a wall connecting piece cannot be arranged at the lower part of the scaffold, adopting a through long rod piece for throwing and supporting when the throwing and supporting is arranged, and fixing the through long rod piece on the scaffold by using a rotary fastener, wherein the inclination angle between the through long rod piece and the ground is 45-60 degrees; the connection point center to primary node distance should not be greater than 300mm.

7. The construction method of the cantilever scaffold with the pull-up tool as claimed in claim 1, wherein the construction method comprises the following steps: step S6 includes the steps of:

s61, the width of each scissor brace is not smaller than 4 spans and not smaller than 6m, and the inclination angle of the inclined rod and the ground is 45-60 degrees;

s62, splicing or butt joint is adopted for splicing the diagonal rods of the scissors, and when splicing is adopted, the splicing length is not less than 1m and is fixed by not less than 3 rotary fasteners;

s63, fixing the diagonal rods of the scissor braces on the extending ends or the vertical rods of the transverse horizontal rods intersecting with the diagonal rods by using a rotary fastener, wherein the distance from the central line of the rotary fastener to a main joint is not more than 150mm;

s64, setting up synchronous arrangement along with the outer frame on the scissors support; double-row scaffold should be provided with scissors support continuously on outer full-elevation

The construction method of the cantilever scaffold with the pull-up tool as claimed in claim 1, wherein the construction method comprises the following steps: step S8 includes the steps of:

s81, fully paving the scaffold boards of the working layer by layer, paving the scaffold boards to be 150mm away from the wall surface, arranging the scaffold boards on four transverse horizontal rods,

the scaffold boards are laid in a butt joint and are laid in a flat mode, when the scaffold boards are laid in a butt joint and are laid in a flat mode, two transverse horizontal rods are arranged at joints, the outer sides of the scaffold boards are extended to be 150mm, the sum of the extending lengths of the two scaffold boards is 300mm,

s82, adopting steel basketry piece scaffold boards, binding by adopting no less than 16# iron wires, and binding the two sides of each scaffold board by no less than 3, and binding the middle by no less than 1.

8. The scaffold board is fully paved, stably paved and solid paved according to each step, the length of the probe of the scaffold board at the end part of the working layer is 150mm, and both ends of the scaffold board are fixed on the support rod pieces.