CN111764621A

CN111764621A - Overhanging scaffold and construction method

Info

Publication number: CN111764621A
Application number: CN202010657826.0A
Authority: CN
Inventors: 王进; 梅俊; 鲁建海
Original assignee: Individual
Current assignee: Jiangsu Xinlong Construction Engineering Co ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2020-10-13

Abstract

The invention relates to an overhanging scaffold and a construction method thereof, which are applied to the technical field of scaffold construction. The invention has the effect of saving resources.

Description

Overhanging scaffold and construction method

Technical Field

The invention relates to the technical field of scaffold construction, in particular to an overhanging scaffold and a construction method.

Background

The scaffold is a support erected for workers to operate and solve vertical and horizontal transportation on a construction site, and is generally used as an overhanging scaffold in a high-rise building structure.

The Chinese patent with the publication number of CN203961258U discloses a cantilever scaffold bottom protection structure, including the scaffold of encorbelmenting, I-steel and concrete structure, the I-steel that a plurality of parallel intervals set up is encorbelmented through the clamping ring of pre-buried in concrete structure and is installed on concrete structure, the cantilever end of I-steel is vertical to be equipped with the scaffold of encorbelmenting admittedly, install protection plate assembly on the I-steel of the scaffold bottom of encorbelmenting, this protection plate assembly includes polylith template and a pair of angle steel, vertically splice between the angle steel that two parallel intervals set up and install polylith template, the template hole of being connected with the angle steel is made respectively at the both ends of every template, the system has the pole hole on the template that.

The above prior art solutions have the following drawbacks: the pre-buried compression ring can not be dismantled, and can only be cut off by oxygen and acetylene after use, thereby causing resource waste.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an overhanging scaffold which has the effect of saving resources.

The above object of the present invention is achieved by the following technical solutions: the utility model provides a scaffold frame encorbelments, includes cantilever beam and installs the scaffold frame main part on cantilever beam, cantilever beam's one end is equipped with the backing plate, the backing plate is connected with building wall through first high strength bolt.

Through adopting above-mentioned technical scheme, the scaffold frame main part uses the cantilever beam as the basis, and the cantilever beam then is fixed on building wall through first high-strength bolt, and after the scaffold frame used, the operator unscrewed first high-strength bolt alright it pull down together with the cantilever beam, convenient and fast, and first high-strength bolt still reuse, both saved the required time of built-in fitting cutting, saved the resource again.

The present invention in a preferred example may be further configured to: the cantilever beam is connected with the building wall through an oblique pulling mechanism, the oblique pulling mechanism comprises a turn buckle, an upper pull rod and a lower pull rod, the upper pull rod and the lower pull rod are respectively in threaded connection with two ends of the turn buckle, one end, far away from the turn buckle, of the upper pull rod is fixed with the building wall through a first anchoring part, and one end, far away from the turn buckle, of the lower pull rod is fixed with the cantilever beam through a second anchoring part.

By adopting the technical scheme, the inclined pulling mechanism distributes the load borne by the cantilever beam, and the bearing performance of the cantilever beam is favorably improved; an operator twists the turn buckle to adjust the distance between the upper pull rod and the lower pull rod, so that the traction on the cantilever beam is ensured, and the flexibility is high.

The present invention in a preferred example may be further configured to: the first anchoring part comprises an ear plate and a second high-strength bolt, the ear plate is connected to the end part of the upper pull rod, and the second high-strength bolt penetrates through the ear plate and then is fixed on the building wall;

the second anchoring part comprises a hanging plate and section steel, the hanging plate is connected to the end part of the lower pull rod and is inserted into the section steel, a third high-strength bolt is arranged on the section steel, the third high-strength bolt penetrates through the hanging plate, and the section steel is fixed on the cantilever beam through a fourth high-strength bolt.

By adopting the technical scheme, the lug plate and the section steel are detachably connected, and the high-strength bolt is used as a stress piece, so that the bearing load of the high-strength bolt is ensured; but the cooperation of third high-strength bolt and hanger plate makes the lower link free rotation, adjusts the angle of lower link, provides convenience for the operator to be connected basket of flowers bolt and upper and lower link.

The present invention in a preferred example may be further configured to: the turn buckle comprises a plurality of turn buckles, a plurality of turn buckles and a plurality of reinforcing steel bars, wherein the turn buckles comprise two turn buckles and a plurality of reinforcing steel bars which are circumferentially fixed on the side walls of the two turn buckles.

Through adopting above-mentioned technical scheme, turnbuckle constitutes simple structure, and the cost is saved to the scene of being convenient for makes according to actual demand.

The present invention in a preferred example may be further configured to: first anchor assembly includes base plate, sleeve, elasticity awl piece and swivel nut, the base plate is connected at last pull rod tip, the base plate passes through fastening bolt and building wall and fixes, the sleeve articulates on the base plate, set up the first through-hole of coaxial distribution on the elasticity awl piece, the elasticity awl piece has seted up a plurality of circumference equidistance distribution's cut-apart groove on big terminal surface, cut-apart groove and first through-hole intercommunication, swivel nut threaded connection has seted up the second through-hole on the sleeve and the swivel nut.

Through adopting above-mentioned technical scheme, the operator inserts the first through-hole with upper pull rod tip, then rotates the swivel nut and inwards promotes elasticity awl piece, and elasticity awl piece receives the extrusion and cliies the upper pull rod to fix upper pull rod, convenient and fast, and upper pull rod loading and unloading alone, repeatedly usable has practiced thrift the resource.

The present invention in a preferred example may be further configured to: the wall of the first through hole is provided with a plurality of teeth, and the second anchoring part has the same structure as the first anchoring part.

Through adopting above-mentioned technical scheme, when the elasticity awl piece received inward extrusion force, tooth embedding go up in the pull rod, increased the power of being connected between elasticity awl piece and the last pull rod, reduced both the possibility that appears becoming flexible and drop.

The invention also aims to provide a construction method of the cantilever scaffold, which comprises the following steps: a1, adopting 16-size I-steel as a cantilever beam member, completely installing the cantilever beam member on the outer side of a wall body, welding steel bars on the I-steel heads, and directly sleeving the steel bars by steel pipes when a scaffold is erected; a2, all the sectional overhanging steel pipe scaffold upright rods, the cross braces and other rod pieces are disconnected at the sectional positions and cannot be continuously arranged up and down; a3, adopting a dense mesh net to enclose the outer vertical surface of the scaffold in a totally-closed manner; the bottom of the steel pipe scaffold must be tightly closed, and the wooden scaffold boards are suitable to be fully paved, the abutted seams of the wooden scaffold boards are tight, and the wooden scaffold boards are firmly bound with the scaffold; a4, the longitudinal distance between the upright posts of the scaffold is 1.5m, the upright posts at the bottom of the scaffold are arranged in a staggered manner by adopting steel pipes with different lengths, the butt joints of the upright posts of the steel pipes are staggered with each other in the height direction by more than 500mm, and the adjacent joints are not in synchronous same span; a5, the vertical rods are reliably connected with the building by wall connecting pieces.

By adopting the technical scheme, the steel bars have a positioning effect on the steel pipes, so that the possibility of steel pipe displacement is reduced; the pole setting, bridging, etc. member bar adopt the segment structure, have reduced the influence each other of each part when bearing load, have improved the stability and the security of scaffold frame.

The present invention in a preferred example may be further configured to: in the step A1, a sleeve pipe with the diameter of 25 multiplied by 200mm is pre-embedded in the beam corresponding to the cantilever beam, and two ends of the sleeve pipe are sealed by using adhesive tapes; after the strength of the concrete meets the requirement, dredging the inner sleeve of the embedded beam, and enabling a first high-strength bolt gasket with the diameter of 20 multiplied by 300mm to pass through a sleeve hole from inside to outside; and sleeving the end parts of the processed I-shaped steel into the two placed first high-strength bolts, then respectively adding gaskets on the bolts to match with two high-strength nuts, and screwing the nuts by using a spanner.

By adopting the technical scheme, the sleeve is sealed by the adhesive tape after being embedded, so that the possibility of blockage in the sleeve is reduced, and convenience is brought to connection of high-strength bolts in the subsequent process.

The present invention in a preferred example may be further configured to: in the step A2, the cross brace diagonal bar is fixed on the extending end or the vertical bar of the cross horizontal bar intersecting with the cross brace diagonal bar by using a rotating fastener, and the distance from the center line of the rotating fastener to the main node is not more than 150 mm;

in step a5, the wall connecting element is preferably located close to the master node and should not be offset from the master node by more than 300 mm.

Through adopting above-mentioned technical scheme, rotatory fastener makes the scaffold frame atress stable with the injecing of linking wall spare position, has reduced the scaffold frame and has taken place the possibility of horizontal bending or toppling.

The present invention in a preferred example may be further configured to: and after the scaffold is dismantled, a hole is timely repaired in the reserved sleeve hole, the diameter of the hole is only 25mm, and structural adhesive mortar is adopted.

By adopting the technical scheme, the structural adhesive mortar blocks the hole, so that the seepage-proofing performance of the wall body is improved, and the strength of the wall body is guaranteed.

In summary, the invention includes at least one of the following beneficial technical effects:

1. by adopting the detachable external cantilever scaffold system, the time required by cutting off the embedded part and the situation that the embedded part cannot be reused after cutting off are reduced, and resources are saved;

2. the upper pull rod and the lower pull rod can be adjusted through the turn buckle, the flexibility is high, the turn buckle can be manufactured on site according to needs, and the cost is reduced;

3. the scaffold is limited by the matching of the steel pipes and the steel bars, so that the stability of the scaffold is improved; the holes reserved on the building wall are plugged by structural adhesive mortar, so that the anti-seepage performance and the integral frontage of the wall are improved.

Drawings

Fig. 1 is a schematic structural diagram of the first embodiment.

Fig. 2 is an enlarged view at a in fig. 1.

FIG. 3 is a schematic structural diagram of a turn buckle embodying the embodiment.

Fig. 4 is an enlarged view of fig. 3 at B.

Fig. 5 is a schematic structural diagram of the second embodiment.

FIG. 6 is a schematic structural diagram of an embodiment for embodying an elastic cone block.

In the figure, 1, a cantilever beam; 11. a base plate; 111. a first high-strength bolt; 2. a cable-stayed mechanism; 21. an upper pull rod; 211. an ear plate; 212. a second high-strength bolt; 22. a turn buckle; 221. a flower basket nut; 222. reinforcing steel bars; 23. a lower pull rod; 231. a hanger plate; 232. section steel; 233. a third high-strength bolt; 234. a fourth high-strength bolt; 3. a scaffold main body; 41. a substrate; 411. fastening a bolt; 42. a sleeve; 43. an elastic cone block; 431. a first through hole; 44. a threaded sleeve; 45. dividing the groove; 46. a second through hole; 47. and (4) teeth.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows: as shown in fig. 1 and 3, the overhanging scaffold disclosed by the invention comprises an overhanging beam 1 and a scaffold main body 3 built on the overhanging beam 1, wherein the overhanging beam 1 is made of i-steel, a backing plate 11 is arranged at one end of the overhanging beam 1, the backing plate 11 is vertically connected with a building wall through first high-strength bolts 111, and the number of the first high-strength bolts 111 is two, so that the connection strength of the fixed part of the overhanging beam 1 is ensured.

As shown in fig. 1, the cantilever beam 1 is connected with the building wall through the cable-stayed mechanism 2, so that a traction effect on the cantilever beam 1 is achieved, the cantilever beam 1, the cable-stayed mechanism 2 and the building wall form a triangle, and the stability and the bearing performance of the cantilever beam 1 are improved. The cable-stayed mechanism 2 comprises an upper pull rod 21, a turn buckle 22 and a lower pull rod 23 which are sequentially arranged along a line, one end of the upper pull rod 21 is fixed with the building wall body through a first anchoring part, the other end of the upper pull rod is in threaded connection with the turn buckle 22, one end of the lower pull rod 23 is fixed with the cantilever beam 1 through a second anchoring part, and the other end of the lower pull rod is in threaded connection with the turn buckle 22.

As shown in fig. 1, the first anchoring member includes an ear plate 211 and a second high-strength bolt 212, the ear plate 211 is formed by bending a steel plate by 20 °, the ear plate 211 is welded to the end of the upper tie rod 21, a hole is formed in the ear plate 211, and the second high-strength bolt 212 passes through the ear plate 211 and is fixed on the building wall.

As shown in fig. 3, the turn buckle 22 includes two turn buckles 221 coaxially distributed, three reinforcing bars 222 are welded on the side walls of the two turn buckles 221 and have axes distributed at equal intervals in the circumferential direction, the two turn buckles 221 are fixed, and the upper pull rod 21 and the lower pull rod 23 are respectively screwed in the two turn buckles 221.

As shown in fig. 2 and 4, the second anchoring member includes a hanging plate 231 and a profile steel 232, the hanging plate 231 is bent by a steel plate and has an opening formed at the bent portion, one end of the hanging plate 231 is welded to the end portion of the lower drawbar 23, the profile steel 232 is fixed to the cantilever beam 1 by a fourth high-strength bolt 234, the bent end of the hanging plate 231 is inserted into the profile steel 232, a third high-strength bolt 233 is arranged on the profile steel 232, and the third high-strength bolt 233 passes through the opening of the hanging plate 231, so that the lower drawbar 23 can rotate freely, and the angle of the lower drawbar 23 can be adjusted.

The implementation principle of the embodiment is as follows: a1, 16H-shaped steel is adopted as the cantilever beam component, the cantilever beam component is completely installed on the outer side of the wall, a backing plate is welded at one end of the H-shaped steel, reinforcing steel bars with the diameter of 20 mm and the height of 10cm are welded at the other end of the H-shaped steel, and when a scaffold is erected, the reinforcing steel bars are directly sleeved by the steel pipes, so that the steel pipes are prevented from displacing.

After the top plate template is erected and before the beam outer mold is closed, accurately releasing a positioning line on the template surface according to a scaffold I-steel plane layout drawing; sleeves of 25 x 200mm are embedded in the beams corresponding to the I-shaped steel and the upper floor where the I-shaped steel is cantilevered, and two ends of each sleeve are sealed by adhesive tapes so as to prevent the interiors of the sleeves from being blocked.

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.

After the strength of the concrete meets the requirement, the side die of the beam is dismantled, the inner sleeve of the embedded beam is dredged, first high-strength bolt gaskets of 20 multiplied by 30mm penetrate through the sleeve holes from inside to outside, the end parts of the processed I-steel are sleeved into the two placed first high-strength bolts, then the gaskets are respectively added on the bolts and matched with two high-strength nuts, and the nuts are screwed by a spanner to finish the fixation of the cantilever beam.

After the upper layer of concrete is hung to reach the strength, the beam side die is disassembled, the second high-strength bolt gasket is penetrated out from the sleeve from inside to outside, and the lug plate of the upper pull rod and the second high-strength bolt are fixedly fixed by double nuts and gaskets; preliminarily fixing the hanging plate by using a third high-strength bolt and a gasket, and firmly fixing the hanging plate after the upper pull rod extends into the hanging plate; butting and continuously rotating the turnbuckle and the lower pull rod screw thread, loosening a third high-strength bolt, extending another turnbuckle into the upper pull rod screw thread to rotate until the turnbuckle is not moved, rotating the turnbuckle by using a tool until the lower pull rod hanging plate and the section steel just can extend into the third high-strength bolt, timely penetrating the third high-strength bolt and screwing, finally rotating the turnbuckle to be not moved by using the tool, and finishing the installation of the upper pull rod and the lower pull rod after the screwing is confirmed; the pulling knot is pulled well, all dental appliances are protected by being wrapped by grease, and whether the turnbuckle is rusted or loosened is regularly checked.

A2, arranging a vertical rod. The scaffold pole setting longitudinal distance is 1.5m, and the bottom pole setting of scaffold adopts the steel pipe discrepancy of different length to arrange, makes the butt joint staggered arrangement of steel pipe pole setting, and the direction of height staggers more than 500mm each other, and adjacent joint should not be in synchronous with striding in to guarantee the wholeness of scaffold.

The vertical rods are reliably connected with the building through the wall connecting pieces, and the maximum distance of the wall connecting pieces from the main node is 300mm, so that the scaffold is prevented from being transversely bent and unstable or overturning.

The vertical rods are lengthened consistently by adopting lap joint, the lap joint meets the following regulation that lap fasteners on the vertical rods are arranged in a staggered mode, lap joints of two adjacent vertical rods are prevented from being arranged in a synchronous mode, the staggered distance of two adjacent joints of one vertical column in the height direction in the synchronous mode is not smaller than 500mm, and the distance from the center of each joint to a main node is not larger than 1/3 of step pitch. The lap length should not be less than 1m, and it is fixed to adopt to be no less than two rotatory fasteners, and the edge of tip and fastener apron is not little 100mm to the rod end distance. The top end of the vertical rod is higher than the upper edge of the parapet by 1m and higher than the upper edge of the cornice by 1.5 m.

Longitudinal and transverse floor sweeping rods are arranged. The vertical floor sweeping rod is fixed on the vertical rod which is not more than 200mm away from the steel I-beam epithelium by a right-angle fastener. The transverse sweeping rod is fixed on the vertical rod which is close to the lower part of the longitudinal sweeping rod by a right-angle fastener.

And erecting a large cross bar and a small cross bar. The pole setting the inside is arranged in to big horizontal pole, and the outside elongation of every side is 150mm, and the main node sets up horizontal horizon bar simultaneously, connects and strictly forbids the dismantlement with right angle fastener, and little horizontal pole setting is in big horizontal pole and outer frame pole setting intersect department to form the whole atress of spatial structure.

The cross brace is erected, the inclination angle of the cross brace and the ground is 45 degrees, the width of each cross brace is 4 spans and is not less than 6 meters, the cross braces are continuously arranged on the whole length and height of the outer side vertical surface, and the extension of the cross brace inclined rods is overlapped. The cross bracing diagonal rods are fixed on the extending ends or the vertical rods of the transverse horizontal rods intersected with the cross bracing diagonal rods by using rotary fasteners, and the distance from the center line of each rotary fastener to the main node is not more than 150 mm.

The wall connecting rod is pulled to be arranged and is horizontally arranged, and when the wall connecting rod cannot be horizontally arranged, one end connected with the scaffold is obliquely connected. When the wall connecting piece can not be arranged at the lower part of the scaffold temporarily, an inclined strut can be erected, the inclined strut is reliably connected with the scaffold by adopting a through long rod piece, and the inclination angle of the inclined strut with the floor is about 45 degrees; the distance from the center of the connection point to the main node is not more than 300 mm.

The sectional overhanging steel pipe scaffold upright rods, the cross braces and other rod pieces are all disconnected at the sectional positions and cannot be continuously arranged up and down; the sectional overhanging steel pipe scaffold upright rods, the cross braces and other rod pieces are all disconnected at the sectional positions and cannot be continuously arranged up and down.

A3, adopting a 2000-mesh/100-square-centimeter dense mesh totally-closed enclosure for the outer vertical surface of the scaffold, tightly closing the bottom of the steel pipe scaffold, paving wooden scaffold boards, and tightly splicing and sewing the wooden scaffold boards to be firmly bound with the scaffold; when the fully paved steel basketry sheet scaffold boards are adopted, the bottoms of the scaffold boards are sealed by dense mesh nets with the mesh size of 2000 meshes/100 square centimeters, the inner side neutral positions of the scaffold boards are sealed by flat nets with the size of 30mm multiplied by 30mm which are arranged at intervals of 4 steps along the height, and the bottoms of the scaffold boards are sealed by film-coated boards.

A4, after the scaffold is dismantled, hole repairing is carried out on the reserved sleeve hole in time, and structural adhesive mortar is adopted for filling; mixing 107 structural adhesive in 1:1 cement mortar, and then filling the cement mortar into a sleeve until the sleeve is compact, wherein the plumpness reaches more than 95%.

Because cantilever beam, upper tie and lower tie all adopt the connection structure of high-strength bolt, can directly lift off high-strength bolt after the scaffold frame is demolishd, and cantilever beam and draw the equal reuse of component of mechanism to one side, have saved the resource, have guaranteed the planarization of wall, have reduced the possibility of outer wall infiltration, have reduced the required time of cutting off the built-in fitting, do benefit to reduction of erection time.

Example two: a cantilever scaffold is shown in figures 5 and 6, and is different from the first embodiment in that a first anchoring member comprises a base plate 41, a sleeve 42, an elastic conical block 43 and a threaded sleeve 44, the base plate 41 is welded at the end of an upper pull rod 21, the base plate 41 is fixed with a building wall through a fastening bolt 411, and the sleeve 42 is hinged on the base plate 41; one end of the small end face of the elastic conical block 43 is inserted into the sleeve 42, a first through hole 431 is formed in the elastic conical block 43 and is distributed coaxially, a plurality of teeth 47 are arranged on the inner wall of the first through hole 431, a plurality of partition grooves 45 are formed in the large end face of the elastic conical block 43 and are distributed equidistantly along the circumferential direction of the axis of the elastic conical block, the partition grooves 45 extend along the taper direction of the elastic conical block 43, each partition groove 45 is communicated with the first through hole 431 and divides the elastic conical block 43 into a plurality of clamping blocks, the threaded sleeve 44 is connected to the sleeve 42 in a threaded mode, a second through hole 46 is formed in the threaded sleeve 44, and the second through hole 46 and the first through hole 431 are distributed coaxially. The second anchor has the same structure as the first anchor, and a base plate 41 of the second anchor is connected to the cantilever beam 1.

As shown in fig. 5 and 6, the fastening bolt 411 is a high-strength bolt, and the connection structure is fixed by pre-embedding a sleeve and then penetrating the sleeve; during installation, an operator firstly screws the upper pull rod 21 and the lower pull rod 23 into the flower basket nut 221, then passes one end, far away from the flower basket nut 221, of the upper pull rod 21 through the second through hole 46 and inserts the end into the first through hole 431, screws the threaded sleeve 44, enables the threaded sleeve 44 to extrude the elastic conical block 43 into the sleeve 42, and each clamping block of the elastic conical block 43 shrinks under external force to clamp the upper pull rod 21, so that the upper pull rod 21 is fixed; screwing the lower pull rod 23 to be close to the corresponding sleeve 42 until the lower pull rod 23 is inserted into the elastic conical block 43, and screwing the threaded sleeve 44 to clamp the lower pull rod 23; finally, the turn buckle 22 is screwed by a tool, so that the upper pull rod 21 and the lower pull rod 23 are mutually tensioned, the operation is simple and convenient, the angles of the upper pull rod 21 and the lower pull rod 23 can be adjusted, and the pairing is rapid.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a scaffold frame of encorbelmenting which characterized in that: including cantilever beam (1) and install scaffold frame main part (3) on cantilever beam (1), the one end of cantilever beam (1) is equipped with backing plate (11), backing plate (11) are connected with building wall through first high-strength bolt (111).

2. The overhanging scaffold of claim 1, wherein: cantilever beam (1) is through drawing mechanism (2) and building wall connection to one side, draw mechanism (2) including basket of flowers bolt (22), go up pull rod (21) and lower link (23) to one side, go up pull rod (21) and lower link (23) threaded connection respectively at the both ends of basket of flowers bolt (22), it is fixed with building wall through first anchor assembly to go up the one end that basket of flowers bolt (22) was kept away from in pull rod (21), the one end that basket of flowers bolt (22) was kept away from in lower link (23) is fixed with cantilever beam (1) through second anchor assembly.

3. The overhanging scaffold of claim 2, wherein: the first anchoring piece comprises an ear plate (211) and a second high-strength bolt (212), the ear plate (211) is connected to the end part of the upper pull rod (21), and the second high-strength bolt (212) penetrates through the ear plate (211) and then is fixed on the building wall;

the second anchoring piece comprises a hanging plate (231) and section steel (232), the hanging plate (231) is connected to the end portion of the lower pull rod (23) and is inserted into the section steel (232), a third high-strength bolt (233) is arranged on the section steel (232), the third high-strength bolt (233) penetrates through the hanging plate (231), and the section steel (232) is fixed to the cantilever beam (1) through a fourth high-strength bolt (234).

4. A cantilever scaffold according to claim 2 or 3, wherein: the turn buckle (22) comprises two turn buckles (221) and a plurality of steel bars (222) which are circumferentially fixed on the side walls of the two turn buckles (221).

5. The overhanging scaffold of claim 2, wherein: the first anchoring part comprises a base plate (41), a sleeve (42), an elastic conical block (43) and a threaded sleeve (44), wherein the base plate (41) is connected to the end part of the upper pull rod (21), the base plate (41) is fixed to a building wall through a fastening bolt (411), the sleeve (42) is hinged to the base plate (41), first through holes (431) which are coaxially distributed are formed in the elastic conical block (43), a plurality of partition grooves (45) which are circumferentially distributed at equal intervals are formed in the large end face of the elastic conical block (43), the partition grooves (45) are communicated with the first through holes (431), and the threaded sleeve (44) is in threaded connection with the sleeve (42) and a second through hole (46) is formed in the threaded sleeve (44).

6. The overhanging scaffold of claim 5, wherein: the hole wall of the first through hole (431) is provided with a plurality of teeth (47), and the second anchoring piece has the same structure as the first anchoring piece.

7. A construction method of a cantilever scaffold is characterized by comprising the following steps: a1, adopting 16-size I-steel as a cantilever beam member, completely installing the cantilever beam member on the outer side of a wall body, welding steel bars on the I-steel heads, and directly sleeving the steel bars by steel pipes when a scaffold is erected; a2, all the sectional overhanging steel pipe scaffold upright rods, the cross braces and other rod pieces are disconnected at the sectional positions and cannot be continuously arranged up and down; the longitudinal distance between the upright posts of the scaffold is 1.5m, the upright posts at the bottom of the scaffold are arranged in a staggered manner by adopting steel pipes with different lengths, the butt joints of the steel pipe upright posts are arranged in a staggered manner, the height directions of the butt joints are staggered by more than 500mm, and the adjacent joints are not in synchronous same span; the upright stanchion is reliably connected with the building by the wall connecting piece; a3, adopting a dense mesh net to enclose the outer vertical surface of the scaffold in a totally-closed manner; the bottom of the steel pipe scaffold must be tightly closed, the wooden scaffold boards are suitable to be fully paved, the abutted seams of the wooden scaffold boards are tight, and the wooden scaffold boards are firmly bound with the scaffold.

8. The cantilever scaffold construction method according to claim 7, wherein: in the step A1, a sleeve pipe with the diameter of 25 multiplied by 200mm is pre-embedded in the beam corresponding to the cantilever beam, and two ends of the sleeve pipe are sealed by using adhesive tapes; after the strength of the concrete meets the requirement, dredging the inner sleeve of the embedded beam, and enabling a first high-strength bolt gasket with the diameter of 20 multiplied by 300mm to pass through a sleeve hole from inside to outside; and sleeving the end parts of the processed I-shaped steel into the two placed first high-strength bolts, then respectively adding gaskets on the bolts to match with two high-strength nuts, and screwing the nuts by using a spanner.

9. The cantilever scaffold construction method according to claim 7, wherein: in the step A2, the cross brace diagonal bar is fixed on the extending end or the vertical bar of the transverse horizontal bar intersected with the cross brace diagonal bar by a rotary fastener, and the distance from the central line of the rotary fastener to the main node is not more than 150 mm;

10. The cantilever scaffold construction method according to claim 7, wherein: after the scaffold is dismantled, in time align

And (5) hole repairing is carried out on the reserved sleeve hole, the diameter of the hole is only 25mm, and structural adhesive mortar is adopted.