CN214658655U

CN214658655U - Adjustable overhanging type scaffold

Info

Publication number: CN214658655U
Application number: CN202022959517.7U
Authority: CN
Inventors: 钱峰; 李健; 罗苗; 陈朝晖; 卢世强; 施彬; 胡志雄; 姜伟; 周虎
Original assignee: Chengdu Construction Ninth Construction Engineering Co ltd
Current assignee: Chengdu Construction Ninth Construction Engineering Co ltd
Priority date: 2020-12-09
Filing date: 2020-12-09
Publication date: 2021-11-09
Anticipated expiration: 2030-12-09

Abstract

The utility model discloses an adjustable overhanging type scaffold, which belongs to the field of building construction auxiliary devices and solves the problems that the assembly and disassembly processes are complicated in the prior art, the embedding error possibly occurs in the embedding process of wall reserved part embedded parts, and the installation position of a fixed seat is wrong, and the adjustable overhanging type scaffold comprises a pull-up component, a pull-down component and a diagonal pull component; the upper pulling assembly comprises a first welding plate, a first I-shaped steel, a first sliding sleeve, a first lug plate and a first pulling connecting piece, and the upper pulling assembly is connected with the reinforced concrete structure at the upper part in a pulling mode; the pull-down assembly comprises a second welding plate, a second I-shaped steel, a second pull-connecting piece, a second sliding sleeve and a second lug plate, and the pull-down assembly is connected with the reinforced concrete structure at the lower part in a pulling manner; draw the subassembly to one side and include pull rod and lower link, go up the pull rod and articulate with first otic placode, the lower link is articulated with the second otic placode, optimizes the structure of traditional scaffold frame, improves dismouting efficiency, and factor of safety avoids leading to scaffold frame installation error because of the position error of reserving the piece, reduces construction cycle.

Description

Adjustable overhanging type scaffold

Technical Field

The utility model belongs to construction auxiliary device field, concretely relates to adjustable overhanging type scaffold frame.

Background

In recent years, with the rapid development of the building industry, the number of layers of a frame shear wall structure is gradually increased, and more overhanging type steel scaffolds are adopted, however, in the construction process, the traditional overhanging frame has many defects and problems, for example, the length of an indoor overhanging steel beam influences the construction of a secondary structure in the later period, and the assembling and disassembling process of the traditional overhanging type scaffold is complicated; embedding errors can occur in the embedding process of the embedded part of the wall reserved part, so that the installation position of the fixed seat is wrong; the existing scaffold rotating telescopic rod for the construction site has certain defects when in use, so that the operation of adjusting the length by workers is inconvenient when in actual use, the length of the telescopic rod is adjusted and fixed by threads, the tensile property is poor, and the threads are easy to deform under the action of long-time high-strength tension; drop-down subassembly and muddy earth structure draw and connect the department, it is not hard up easily to receive outside pulling force and decurrent shearing force for a long time, there is the potential safety hazard, based on the tradition actual problem of encorbelmenting in the engineering, come several years, along with the accumulation of practical application experience, through optimizing the way to the frame of encorbelmenting, this application provides one kind adjustable, simple to operate, especially in the aspect of demolising, it is very convenient, building structure damage is little, the appearance is neat pleasing to the eye to the formula scaffold frame of encorbelmenting, this frame structure of encorbelmenting is comparatively stable simultaneously, construction speed is fast, can dismantle the removal, to the brickwork construction etc. of later stage do not have the influence, do benefit to the environmental protection, and convenient for popularization and application.

SUMMERY OF THE UTILITY MODEL

To dismouting process among the prior art loaded down with trivial details, the joint department is easy not hard up, has the potential safety hazard, and the error probably appears burying underground in the in-process underground to the wall body reservation part built-in fitting, leads to the problem that fixing base mounted position is wrong, the utility model provides an adjustable, simple to operate is especially in the aspect of demolising, and is very convenient, and building structural damage is little, safe and reliable, and the appearance is neat pleasing to the eye to overhanging type scaffold, its aim at: optimize the structure of traditional scaffold frame, improve dismouting efficiency, avoid leading to scaffold frame installation error because of the position error of reserving the piece, improve factor of safety, reduce construction cycle.

The utility model adopts the technical scheme as follows:

the utility model relates to an adjustable overhanging type scaffold, which comprises an upper pulling component, a lower pulling component and an inclined pulling component;

the pull-up assembly comprises a first welding plate, a first I-shaped steel, a first sliding sleeve, a first lug plate and a first pull-connecting piece, wherein the first welding plate is connected with a reinforced concrete structure positioned above the first welding plate in a pull-connecting mode through the first pull-connecting piece, the first welding plate is welded with one end of the first I-shaped steel in a double-sided high-strength mode, a plurality of adjusting screw holes are formed in the first I-shaped steel, the first sliding sleeve is sleeved outside the first I-shaped steel and is connected with the first I-shaped steel in a sliding mode, the first sliding sleeve can be fixed on the first I-shaped steel through bolts, and the first lug plate is welded to the lower end face of the first sliding sleeve in a double-sided high-strength mode;

the lower pulling assembly comprises a second welding plate, a second I-shaped steel, a second pulling piece, a second sliding sleeve and a second lug plate, the second welding plate is pulled and connected with a reinforced concrete structure located below through the second pulling piece, a second steel plate is welded and fixed with one end of the second I-shaped steel in a double-sided high-strength mode, a plurality of adjusting screw holes are formed in the second I-shaped steel, the second sliding sleeve is sleeved outside the second I-shaped steel and is in sliding connection with the second I-shaped steel, the second sliding sleeve can be fixed on the second I-shaped steel through bolts, and the second lug plate is welded on the upper end face of the second sliding sleeve in a double-sided high-strength mode;

the cable-stayed assembly comprises an upper pull rod and a lower pull rod, one end of the upper pull rod is hinged to a first ear plate of the upper pull assembly, one end of the lower pull rod is hinged to a second ear plate of the lower pull assembly, a plurality of positioning screw holes are formed in the upper pull rod and the lower pull rod, and the upper pull rod and the lower pull rod are sleeved and fixed through positioning bolts.

Adopt above-mentioned technical scheme, the subassembly is drawn to the upper portion, the subassembly is drawn down and draw the subassembly to one side and formed stable triangle atress system, and stable in structure is reliable for support the scaffold frame of upper portion construction usefulness, the slip cap of drawing the subassembly and drawing the subassembly down can follow the I-steel and remove and pass through the bolt fastening about, draw the length of subassembly to one side scalable, according to actual construction demand, adjust the length and the hookup location who draw the subassembly to one side, avoid wall body to reserve a position error and build to cause the influence to the scaffold frame.

Further, for better realizing the utility model discloses, first sliding sleeve and second sliding sleeve are the same structure and the cooperation of shape size and I-steel shape size, sliding sleeve and I-steel sliding connection, and the sliding sleeve can remove about, adjusting position.

Further, for better realizing the utility model discloses, all be equipped with two screw holes on first sliding sleeve and the second sliding sleeve, the screw hole size on screw hole and first I-steel, the second I-steel is the same, and sliding sleeve accessible bolt and I-steel fixed connection are reliable and stable.

Further, for better realizing the utility model discloses, first otic placode and second otic placode are the same structure and are steel shape of a hoof binaural board.

Further, for better realizing the utility model discloses, the lower link includes cavity sleeve pipe and solid pull rod, cavity sheathed tube internal diameter is the same with the diameter of last pull rod, has adjusted the position back of going up pull rod and lower link, and is fixed through positioning bolt.

Further, for better realizing the utility model discloses, be equipped with first stopper on the first I-steel, first stopper is located the outside that screw was adjusted to first I-steel, be equipped with the second stopper on the second I-steel, second stopper quantity is two, is located the both sides that screw was adjusted to the second I-steel respectively, and the second stopper can be connected with the scaffold frame that is used for the operation of encorbelmenting.

Further, for better realizing the utility model discloses, first stopper and second stopper are steel bar structure, and are the state of parallelism each other and fix and weld on first I-steel and second I-steel.

Furthermore, in order to better realize the utility model, the pull-up assembly further comprises a first stiffening plate, and the first stiffening plate is welded and fixed with the first welding plate and the first I-shaped steel on both sides; the lower pulling assembly also comprises a second stiffening plate, and the second stiffening plate is welded and fixed with the second welding plate and the second I-shaped steel on two sides; the first welding plate, the second welding plate, the first stiffening plate and the second stiffening plate are all of steel plate structures, and the stability of the structures of the pull-up assembly and the pull-down assembly is improved.

Further, pull-down subassembly and the reinforced concrete structure that is located the below draw and connect a fixed connection through four seconds, have improved pull-down subassembly and the stability of mixing earth structural connection.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

1. need not be in draw formula I-steel support piece of encorbelmenting to one side need not trompil on the template, can be applied to any template system.

2. The connecting node of the cable-stayed assembly is optimally designed, the length and the angle of the connecting node can be adjusted, and the connecting node is not influenced by the position error of an embedded part, the height of a structural layer and the appearance.

3. The method does not occupy indoor space, does not influence indoor decoration operation, and shortens the whole construction period.

4. The stable triangular stress system is formed by the pull-up assembly, the pull-down assembly and the inclined pull assembly, and is used for supporting a scaffold for upper construction, and the structure is stable and reliable.

5. The pull-down assembly and the concrete structure are fixed in a pulling connection mode through two groups of bolts, the overall structural stability of the device is improved, and the safety factor is improved.

6. The anchor ring steel bar structure is omitted, raw materials are saved, and the construction cost is reduced.

7. The structure of pairing rotation telescopic link has improved, and with the mode that length was adjusted to the screw rod cover before, the improvement is the mode that positioning bolt adjusted the fixed length, has improved the structural stability of telescopic link, improves dismouting efficiency simultaneously.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural view of an adjustable overhanging scaffold of the present invention;

FIG. 2 is a schematic structural view of a pull-up assembly;

FIG. 3 is a schematic diagram of a pull-down assembly;

FIG. 4 is a schematic structural view of a cable-stayed assembly;

FIG. 5 is a cross-sectional view of the connection of a second I-steel of the drop down assembly to a second weld plate;

fig. 6 is a cross-sectional view of a connection structure of a pull-down assembly and a cable-stayed assembly.

Reference numerals

1-an upper pulling component, 2-a diagonal pulling component, 3-a lower pulling component, 11-an upper reinforced concrete structure, 12-a first pulling connecting piece, 13-a first stiffening plate, 14-a first welding plate, 15-a first sliding sleeve, 16-a first I-shaped steel, 17-a first lug plate, 18-a first limiting block, 21-an upper pulling rod, 22-a lower pulling rod, 23-a positioning screw hole, 221-a hollow sleeve, 222-a solid rod, 31-a lower reinforced concrete structure, 32-a second welding plate, 33-a second pulling connecting piece, 34-a second stiffening plate, 35-a second I-shaped steel, 36-a second limiting block, 37-a second sliding sleeve and 38-a second lug plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of description and simplification of the description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

The present invention will be described in detail with reference to fig. 1 to 6.

The utility model relates to an adjustable overhanging type scaffold, which comprises a pull-up component 1, a pull-down component 3 and a diagonal pulling component 2;

the pull-up assembly 1 comprises a first welding plate 14, first I-beams 16, a first sliding sleeve 15, a first lug plate 17 and first pull-connecting pieces 12, wherein the first welding plate 14 is connected with a reinforced concrete structure 11 positioned above through the two first pull-connecting pieces 12 in a pull-connection mode, the first welding plate 14 is fixedly welded with one ends of the first I-beams 16, three phi 26 adjusting screw holes are formed in the first I-beams 16, the first sliding sleeve 15 is installed outside the first I-beams 16 and is in sliding connection with the first I-beams 16, the first sliding sleeve 15 can be fixed on the first I-beams 16 through bolts, and the first lug plate 17 is welded on the lower end face of the first sliding sleeve 15;

the lower pulling assembly 3 comprises a second welding plate 32, a second I-shaped steel 35, a second pulling and connecting piece 33, a second sliding sleeve 37 and a second lug plate 38, the second welding plate 32 is pulled and connected with a reinforced concrete structure 31 located below through four second pulling and connecting pieces 33, the second steel plate is welded and fixed with one end of the second I-shaped steel 35, five phi 26 adjusting screw holes are formed in the second I-shaped steel 35, the second sliding sleeve 37 is installed outside the second I-shaped steel 35 and is in sliding connection with the second I-shaped steel 35, the second sliding sleeve 37 can be fixed on the second I-shaped steel 35 through bolts, and the second lug plate 38 is welded on the upper end face of the second sliding sleeve 37;

the cable-stayed component 2 comprises an upper pull rod 21 and a lower pull rod 22, one end of the upper pull rod 21 is hinged to a first lug plate 17 of the upper pull component 1, one end of the lower pull rod 22 is hinged to a second lug plate 38 of the lower pull component 3, a plurality of positioning holes are formed in the upper pull rod 21 and the lower pull rod 22, and the upper pull rod 21 and the lower pull rod 22 are sleeved and fixed through positioning bolts.

In this embodiment, the first i-beam 16 and the second i-beam 35 are 18# i-beams, and are made of Q345-grade steel, the first welding steel plate and the second welding steel plate are Q345-grade steel plates with a thickness of 16mm, the size of each of the first welding steel plate and the second welding steel plate is not smaller than 280mm × 200mm, and two round holes with a diameter of 26 are formed in each of the first ear plate 17 and the second ear plate 38, the first ear plate and the second ear plate are horseshoe-shaped steel double ear plates with a thickness of not smaller than 12mm, the distance between the two ear plates is 70, and the ear plates are provided with round holes with a diameter of 20 mm.

The section steel beam structure formed by the welded steel plates, the stiffening plates and the I-shaped steel can effectively enhance the strength of the section steel beam, and can also enhance the supporting strength of the section steel beam on the building external scaffold, so that the whole supporting system is more stable.

The steel plate pull-up component 1, the pull-down component 3 and the inclined pull component 2 form a stable triangular stress system for supporting a scaffold for upper construction, and the structure is stable and reliable

In this embodiment, the first sliding sleeve 15 and the second sliding sleeve 37 are Q345-grade steel plates with a thickness of 14mm, and have a size not less than 110mm × 208mm × 122mm, the first sliding sleeve 15 and the second sliding sleeve 37 have the same structure, and have shapes and sizes matched with those of i-shaped steel, the sliding sleeves are connected with the i-shaped steel in a sliding manner, and the sliding sleeves can move left and right to adjust positions.

The first sliding sleeve 15 and the second sliding sleeve 37 are both provided with two phi 26 round hole threaded holes, the threaded holes are the same as the threaded holes in the first I-shaped steel 16 and the second I-shaped steel 35, and the sliding sleeves can be fixedly connected with the I-shaped steels through bolts, so that the sliding sleeve is stable and reliable.

In this embodiment, the lower pull rod 22 includes a hollow sleeve 221 and a solid pull rod, the diameter of the hollow sleeve 221 is the same as that of the upper pull rod 21, and the upper pull rod 21 and the lower pull rod 22 are fixed by a positioning bolt after the positions are adjusted. Go up pull rod 21 and pull down rod 22's solid pull rod and be the material and be Q235 level steel bar structure, the diameter is not less than 20mm, the one end of going up pull rod 21 and pull down rod 22 is the loop configuration, the other end all is equipped with positioning screw 23, can realize the regulation to the length of drawing subassembly 2 to one side through the fixed mode of positioning bolt, go up pull rod 21 and pull down rod 22 and constitute one both ends and have loop configuration draw subassembly 2 to one side, the inclination that draws subassembly 2 adjustable to one side is 30-50.

Wherein, be equipped with first stopper 18 on the first I-steel 16, first stopper 18 is located the outside that first I-steel 16 adjusted the screw, be equipped with second stopper 36 on the second I-steel 35, second stopper 36 quantity is two, is located the both sides that second I-steel 35 adjusted the screw respectively, and second stopper 36 can be connected with the scaffold frame that is used for the operation of encorbelmenting.

The first limiting block 18 and the second limiting block 36 are both of a steel bar structure, made of Q235-grade round steel, 20mm in diameter, and fixedly welded to the first I-shaped steel 16 and the second I-shaped steel 35 in a mutually parallel state.

The upper pulling assembly 1 further comprises a first stiffening plate 13, and the first stiffening plate 13, a first welding plate 14 and a first I-shaped steel 16 are welded and fixed on two sides; the pull-down assembly 3 further comprises a second stiffening plate 34, and the second stiffening plate 34 is welded and fixed with the second welding plate 32 and the second I-shaped steel 35 on two sides; the first stiffening plates 13 and the second stiffening plates 34 are Q345-grade steel plates with the thickness of 18mm, and the structural stability of the pull-up assembly 1 and the pull-down assembly 3 is improved.

In this embodiment, it is further preferable that one end of the first pulling-connecting piece 12 connected to the concrete structure located above is embedded in the concrete structure above, and the other end of the first pulling-connecting piece is connected to the first welding plate 14; the second pulling and connecting piece 33 and one end connected with the concrete structure below are embedded in the concrete structure below, the other end of the second pulling and connecting piece 33 is connected with the second welding plate 32, the binding of the structural beam/wall reinforcing steel bar on the upper layer of the overhanging layer is completed, after the installation of the outer side template is completed, the embedded piece of the first pulling and connecting piece 12 is installed, after the position is checked and fixed, the inner side template is installed and reinforced, after the concrete is poured and the strength of the concrete meets the requirement, the first pulling and connecting piece 12 penetrates through and fixes the first welding plate 14, the first I-shaped steel 16, the first stiffening plate 13 and the first welding plate 14 are welded and fixed in a double-faced plug welding mode, the first lug plate 17 and the lower end face of the first sliding sleeve 15 are welded and fixed, the first sliding sleeve 15 is sleeved on the first I-shaped steel 16, and the first limiting block 18 is welded on the outer side of the screw hole of the first I-shaped steel 16; the second pulling and connecting piece 33 penetrates through and fixes the second welding plate 32, the second i-steel 35, the second stiffening plate 34 and the second welding plate 32 are welded and fixed in a double-sided plug welding mode, the upper end face of the second lug plate 38 and the upper end face of the second sliding sleeve 37 are welded and fixed, the second sliding sleeve 37 is sleeved on the second i-steel 35, the second limiting block 36 is welded on two sides of a screw hole of the second i-steel 35, the circular ring at the upper part of the upper pull rod 21 of the cable-stayed assembly 2 is connected to the first lug plate 17 through high-strength bolts, gaskets and nuts, the circular ring at the lower part of the lower pull rod 22 of the cable-stayed assembly 2 is connected to the second lug plate 38 through the high-strength bolts, gaskets and nuts, the required length and angle of the cable-stayed assembly 2 are adjusted, and the positions of the first sliding sleeve 15 and the second sliding sleeve 37 are fixed through bolts. The first pulling and connecting piece 12 and the second pulling and connecting piece 33 are both a multipurpose pulling and connecting piece without an opening, are directly processed and produced by a factory, can be embedded in a concrete structure under the condition that a template does not have an opening, and meanwhile, the upper end of the diagonal pulling assembly 2 is firmly connected with the first lug plate 17 of the first I-shaped steel 16, and the lower end of the diagonal pulling assembly 2 is firmly connected with the second lug plate 38 of the second I-shaped steel 35, so that a stable triangular stress system is formed together with the concrete structure and is used for supporting an upper construction scaffold.

Other structures and operating principles thereof involved in the present embodiment are well known to those skilled in the art and will not be described in detail.

The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.

Claims

1. An adjustable overhanging type scaffold is characterized by comprising an upward pulling assembly (1), a downward pulling assembly (3) and a diagonal pulling assembly (2); the upward pulling assembly (1) comprises a first welding plate (14), a first I-shaped steel (16), a first sliding sleeve (15), a first lug plate (17) and a first pulling and connecting piece (12), wherein the first welding plate (14) is pulled and connected with a reinforced concrete structure (11) positioned above through the first pulling and connecting piece (12), the first welding plate (14) is welded and fixed with one end of the first I-shaped steel (16), a plurality of adjusting screw holes are formed in the first I-shaped steel (16), the first sliding sleeve (15) is sleeved outside the first I-shaped steel (16) and is in sliding connection with the first I-shaped steel (16), the first sliding sleeve (15) can be fixed on the first I-shaped steel (16) through bolts, and the first lug plate (17) is welded on the lower end face of the first sliding sleeve (15); the lower pulling assembly (3) comprises a second welding plate (32), a second I-shaped steel (35), a second pulling piece (33), a second sliding sleeve (37) and a second lug plate (38), the second welding plate (32) is connected with a reinforced concrete structure (31) located below through the second pulling piece (33) in a pulling mode, the second welding plate (32) is fixedly welded to one end of the second I-shaped steel (35), a plurality of adjusting screw holes are formed in the second I-shaped steel (35), the second sliding sleeve (37) is installed outside the second I-shaped steel (35) and is in sliding connection with the second I-shaped steel (35), the second sliding sleeve (37) can be fixed on the second I-shaped steel (35) through bolts, and the second lug plate (38) is welded to the upper end face of the second sliding sleeve (37); draw subassembly (2) to one side and include pull-up rod (21) and lower link (22), the one end of pull-up rod (21) is articulated with first otic placode (17) of pull-up subassembly (1), the one end of lower link (22) is articulated with second otic placode (38) of lower link (3), all is equipped with a plurality of location screw holes (23) on pull-up rod (21) and lower link (22), cup joints between pull-up rod (21) and lower link (22) and passes through positioning bolt fixed.

2. An adjustable cantilever scaffold according to claim 1, wherein the first sliding sleeve (15) and the second sliding sleeve (37) are of the same structure and have a shape and size matched with the shape and size of an I-steel.

3. An adjustable overhanging scaffold according to claim 1, wherein the first sliding sleeve (15) and the second sliding sleeve (37) are provided with two threaded holes, and the threaded holes are the same size as the adjusting threaded holes on the first i-steel (16) and the second i-steel (35).

4. An adjustable cantilever scaffold according to claim 1, wherein the first and second ear plates (17, 38) are of the same construction and are both steel horseshoe shaped double ear plates.

5. An adjustable overhanging scaffold according to claim 1 wherein the lower drawbar (22) comprises a hollow sleeve (221) and a solid bar (222), the inner diameter of the hollow sleeve (221) and the diameter of the upper drawbar (21) being the same.

6. The adjustable overhanging type scaffold according to claim 1, wherein a first limit block (18) is arranged on the first I-beam (16), the first limit block (18) is positioned at the outer side of the adjusting screw hole of the first I-beam (16), a second limit block (36) is arranged on the second I-beam (35), the number of the second limit blocks (36) is two, the two second limit blocks are respectively positioned at two sides of the adjusting screw hole of the second I-beam (35), and the second limit blocks (36) can be connected with the scaffold for overhanging operation.

7. The adjustable overhanging scaffold according to claim 6, wherein the first and second stoppers (18, 36) are both of steel bar structure and are fixedly welded to the first and second I-beams (16, 35) in parallel state.

8. The adjustable overhanging scaffold according to claim 1, wherein the upper pulling assembly (1) further comprises a first stiffening plate (13), the first stiffening plate (13) is fixed with the first welding plate (14) and the first I-shaped steel (16) by double-sided welding; the pull-down assembly (3) further comprises a second stiffening plate (34), and the second stiffening plate (34), the second welding plate (32) and the second I-shaped steel (35) are welded and fixed on the two sides; the first welding plate (14), the second welding plate (32), the first stiffening plate (13) and the second stiffening plate (34) are all of steel plate structures.

9. An adjustable overhanging scaffold according to claim 1, characterized in that the drop down assembly (3) is fixedly connected to the underlying reinforced concrete structure (31) by four second tie-members.