CN114412152A - Construction method for constructing I-steel scaffold by large-span overhanging structure of high-rise cluster project - Google Patents
Construction method for constructing I-steel scaffold by large-span overhanging structure of high-rise cluster project Download PDFInfo
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- CN114412152A CN114412152A CN202210097895.XA CN202210097895A CN114412152A CN 114412152 A CN114412152 A CN 114412152A CN 202210097895 A CN202210097895 A CN 202210097895A CN 114412152 A CN114412152 A CN 114412152A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
- E04G3/18—Scaffolds essentially supported by building constructions, e.g. adjustable in height supported by cantilevers or other provisions mounted in openings in the building, e.g. window openings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/04—Means for fastening, supporting, or bracing scaffolds on or against building constructions
- E04G5/046—Means for fastening, supporting, or bracing scaffolds on or against building constructions for fastening scaffoldings on walls
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/08—Scaffold boards or planks
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/14—Railings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G7/00—Connections between parts of the scaffold
- E04G7/02—Connections between parts of the scaffold with separate coupling elements
- E04G7/06—Stiff scaffolding clamps for connecting scaffold members of common shape
- E04G7/20—Stiff scaffolding clamps for connecting scaffold members of common shape for ends of members only, e.g. for connecting members in end-to-end relation
Abstract
The invention discloses a construction method for constructing an I-steel scaffold by a large-span overhanging structure of a high-rise cluster project, which comprises the following steps: 1) arranging a plurality of horizontal cantilever beams; 2) arranging a plurality of groups of upright rod assemblies; 3) arranging a first cross bar and a second cross bar; 4) arranging a shear support assembly; 5) wall connecting construction; 6) unloading construction; 7) arranging a scaffold board and a foot baffle board; 8) arranging a protective guard; 9) and after the building construction is finished, dismantling the outer scaffold of the cantilever beam. The cantilever structure scaffold is adopted to replace a high-rise building to erect construction from the ground, and the defects that the full scaffold is high in material consumption, long in installation and disassembly time, long in time consumption, high in cost, difficult in installation and disassembly, high in danger, large in material investment and the like are overcome. Compared with the traditional inclined stay rope 'embedded ring' of the cantilever frame, the labor is saved, the inclined stay rope can be recycled for many times, the length of the pull rod can be adjusted at any time to ensure the stability of the frame body, and the I-shaped steel can be reused.
Description
Technical Field
The invention relates to the technical field of engineering construction, in particular to a construction method for constructing an I-steel scaffold by using a large-span overhanging structure of a high-rise cluster project.
Background
The external scaffold is generally a scaffold erected on the periphery of a building, and in the construction process, the speed and the quality of the erected scaffold are key control points of building construction. The existing external scaffold is not connected with the outer wall of a building body, so that the external scaffold is not stably erected, the quality is difficult to guarantee, and meanwhile, the existing construction method for erecting the external scaffold is low in speed.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art, and provides a method for constructing an I-steel scaffold by using a large-span overhanging structure of a high-rise cluster project, which comprises the following steps:
1) the method comprises the following steps that a plurality of horizontal cantilever beams are arranged, the horizontal cantilever beams are made of I-shaped steel, one ends, far away from the building outer wall, of the horizontal cantilever beams are connected with inclined hoisting steel ropes, and the other ends of the inclined hoisting steel ropes are located above the horizontal cantilever beams and connected with the building outer wall;
2) set up multiunit pole setting subassembly: the vertical rod assemblies comprise outer vertical rods and inner vertical rods which are arranged in parallel and at intervals, the inner vertical rods are arranged opposite to the outer wall of the building body, the outer vertical rods and the inner vertical rods are connected through transverse sweeping rods, a plurality of groups of vertical rod assemblies are connected through longitudinal sweeping rods, the vertical rod assemblies are arranged on the horizontal cantilever beams, and the number of the vertical rod assemblies is the same as that of the horizontal cantilever beams and is arranged in a one-to-one mode;
3) setting a first cross rod and a second cross rod: a plurality of first cross rods and a plurality of second cross rods are arranged in the height direction of the vertical rod assembly at intervals, two ends of each first cross rod are respectively connected with the outer vertical rod and the inner vertical rod, the second cross rods are connected to the outer vertical rods, the end parts of the second cross rods are positioned at the joint of the first cross rods and the outer vertical rods, and the first cross rods are arranged above the second cross rods;
4) setting a shear support component: the outer vertical surface of the outer vertical rod is connected with a shear support component, and the vertical shear support component is continuously arranged from bottom to top along the full width and the full height of the outer vertical surface of the outer vertical rod;
5) and (3) wall connecting construction: the upright rod component is fixedly connected with a wall connecting piece embedded in the outer wall of the building body in a pulling manner;
6) unloading construction: after the connection strength of the inclined hoisting steel rope and the building outer wall reaches 100% of the design strength, unloading the inclined hoisting steel rope;
7) set up scaffold board and keep off the sole: a foot baffle plate is connected to the inner vertical rod and positioned between the inner vertical rod and the outer wall of the building body, and a scaffold plate is laid between the inner vertical rod and the outer vertical rod and arranged on the first cross rod;
8) setting a protective guard: the outer vertical rod is fixedly provided with a protective railing, and the outer vertical surface of the outer vertical rod is fully hung with a dense mesh type safety net;
9) after the building construction is completed, dismantling the cantilever beam outer scaffold: firstly, the scaffold board, the foot baffle board and the shear support assembly are disassembled, and then the first cross rod, the second cross rod and the vertical rod assembly are disassembled.
Has the advantages that: the cantilever structure scaffold is adopted to replace a high-rise building to erect construction from the ground, and the defects that the full scaffold is high in material consumption, long in installation and disassembly time, long in time consumption, high in cost, difficult in installation and disassembly, high in danger, large in material investment and the like are overcome. Compared with the traditional inclined stay rope 'embedded ring' of the cantilever frame, the labor is saved, the inclined stay rope can be recycled for many times, the length of the pull rod can be adjusted at any time to ensure the stability of the frame body, and the I-shaped steel can be reused.
In some embodiments of the invention, in step 1), when the cantilever length of the horizontal cantilever beam is 1300mm and the anchoring length is 2000mm, 20 a-size i-steel is adopted.
In some embodiments of the invention, in step 1), when the cantilever length of the horizontal cantilever beam is 2000mm and the anchoring length is 3000mm, 25 a-size i-steel is adopted.
In some embodiments of the invention, in step 2), the vertical deviation of each inner upright and each outer upright is controlled to be 100mm or less.
In some embodiments of the invention, in step 3), the two ends of the first crossbar extend 150mm away from the inner and outer uprights respectively.
In some embodiments of the present invention, in step 4), the angle at which the shear support assembly is erected is 45 ° to 60 °.
In some embodiments of the invention, in step 4), after the shear brace assembly is arranged, transverse diagonal braces are arranged at openings at two ends of the cantilever beam outer scaffold, and the transverse diagonal braces are continuously arranged in a zigzag manner from bottom to top in the same section.
In some embodiments of the invention, in step 5), the pulling point of the pulling joint of the upright rod assembly and the wall connecting piece embedded in the outer wall of the building body is set within 300mm of the joint of the first cross rod and the second cross rod.
In some embodiments of the invention, in step 7), the foot blocking plate is a stamped steel plate, and the height of the foot blocking plate is 180 mm.
In some embodiments of the invention, in step 2), a positioning steel bar with an outer diameter of 25mm is welded on the horizontal cantilever beam, and the vertical rod assembly is sleeved and seated outside the positioning steel bar.
Drawings
The invention is further described in the following with reference to the accompanying drawings, it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from these drawings without inventive effort.
FIG. 1 is a schematic plan view of the construction of an embodiment of the present invention;
FIG. 2 is a schematic view of an embodiment of the present invention with transverse braces;
FIG. 3 is a schematic structural diagram of an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a shear support assembly according to an embodiment of the present invention.
Reference numerals:
10-horizontal cantilever beam;
20-obliquely hanging a steel rope;
31-outer vertical rod;
32-inner vertical rod;
33-a transverse sweeping bar;
34-longitudinal sweeping bar;
35-a first cross bar;
36-a second cross bar;
37-a shear brace assembly;
41-a foot baffle plate;
42-scaffold board;
43-a safety net;
44-transverse diagonal bracing;
45-wall connecting pieces;
46-protective railing;
47-wood purlin;
50-angle at which the shear brace assembly is erected.
Detailed Description
The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
It will be understood that the terms "upper", "lower", "left", "right", "front", "back", "bottom", "top", "inner", "outer", and the like, as used herein, refer to orientations or positional relationships illustrated in the drawings, which are used for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting of the present invention.
Herein, the terms "first", "second", and the like are used for distinguishing different objects, not for describing a particular order. As used herein, the terms "a", "an", and "the" are used interchangeably, and the term "a" and "an" are used interchangeably.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
Referring to fig. 1 to 4, an embodiment of the present invention provides a method for constructing an i-steel scaffold by using a large-span overhanging structure of a high-rise cluster project, including the following steps:
1) a plurality of horizontal cantilever beams 10 are arranged, the horizontal cantilever beams 10 are made of I-steel, one ends, far away from the building outer wall, of the horizontal cantilever beams 10 are connected with inclined hoisting steel ropes 20, and the other ends of the inclined hoisting steel ropes 20 are located above the horizontal cantilever beams 10 and are connected with the building outer wall. Two diagonal steel wire ropes are arranged at the position of the outer vertical rod 31.
In some embodiments, 20a h-beam is used when the cantilever length of the horizontal cantilever beam 10 is 1300mm and the anchoring length is 2000 mm.
In other embodiments, when the cantilever length of the horizontal cantilever beam 10 is 2000mm and the anchoring length is 3000mm, 25a h-shaped steel is adopted, and the vertical rod assembly is an inner vertical rod 32, a middle vertical rod and an outer vertical rod 31 which are sequentially arranged from inside to outside, namely three layers of vertical rods.
2) Set up multiunit pole setting subassembly: the pole setting subassembly includes the outer pole setting 31 and the interior pole setting 32 that parallel and interval set up, and interior pole setting 32 sets up with the building body outer wall relatively, and outer pole setting 31 and interior pole setting 32 are connected through horizontal pole 33 of sweeping the ground, and multiunit pole setting subassembly is connected through vertical pole 34 of sweeping the ground, and on horizontal cantilever beam 10 was located to the pole setting subassembly, the positioning bar that the welding external diameter was 25mm on horizontal cantilever beam 10, pole setting subassembly cover seat was outside positioning bar to ensure the stability of support body. The number of the upright rod components is the same as that of the horizontal cantilever beams 10 and the upright rod components are arranged one by one. The vertical deviation of each inner vertical rod 32 and each outer vertical rod 31 is controlled to be less than or equal to 100 mm.
The horizontal cantilever beam 10 must ensure enough anchoring strength and section buckling resistance, and the longitudinal distance of the horizontal cantilever beam 10 is the same as that of the vertical rod assembly. The outer vertical rod 31 and the inner vertical rod 32 are respectively formed by splicing and connecting a plurality of vertical rod pieces, and the vertical rod pieces are connected by butt joints. The outer vertical rod 31 and the inner vertical rod 32 are connected with the first cross rod 35 by right-angle fasteners, the positions of the joints are arranged in a staggered manner, the joints of two adjacent vertical rods are prevented from appearing in the same synchronous span, and the staggered distance in the height direction is not less than 50 cm; the distance between the center of each joint and the main node is not more than 60 cm.
3) Providing first crossbar 35 and second crossbar 36: a plurality of first cross bars 35 and a plurality of second cross bars 36 are arranged at intervals in the height direction of the vertical rod assembly, two ends of the first cross bars 35 are respectively connected with the outer vertical rod 31 and the inner vertical rod 32, and in some embodiments, two ends of the first cross bars 35 respectively far away from the inner vertical rod 32 and the outer vertical rod 31 have an extended length of 150 mm. The second cross bar 36 is connected to the outer vertical rod 31, the end of the second cross bar 36 is located at the joint of the first cross bar 35 and the outer vertical rod 31, and the first cross bar 35 is arranged above the second cross bar 36 to form a space structure to bear force integrally.
4) Setting the shear brace assembly 37: the outer vertical surface of the outer vertical rod 31 is connected with a shear support assembly 37, and the shear support assembly 37 is continuously provided with a vertical shear support assembly 37 from bottom to top along the full width and the full height of the outer vertical surface of the outer vertical rod 31. With continued reference to fig. 4, in particular, the angle 50 at which the shear brace assemblies are set up is 45 ° to 60 °.
It can be understood that the first shear brace and the second shear brace are respectively formed by extending and splicing a plurality of brace pieces and are fixed by a rotating fastener, and the distance from the central line of the rotating fastener to the main node is not more than 100 mm.
It can be understood that after the shear brace assembly 37 is arranged, the transverse diagonal braces 44 are arranged at the openings at the two ends of the scaffold outside the cantilever beam, and the transverse diagonal braces 44 are continuously arranged in a zigzag manner from bottom to top in the same section. The transverse diagonal braces 44 are secured to the first cross bar 35 relative thereto using a rotational fastener. In some embodiments, when lateral diagonal brace 44 spans two steps in a span, a first cross bar 35 is added at intersecting second cross bar 36, and lateral diagonal brace 44 is secured to the extended end of the added first cross bar 35.
5) And (3) wall connecting construction: the upright pole component is fixedly connected with a wall connecting piece 45 embedded in the outer wall of the building body in a pulling mode. It can be understood that the embedded wall connecting member 45 is a steel pipe or a steel bar. The wall connecting piece 45 is arranged according to the three spans of each floor of the building body, and is vertically arranged for each floor. And (4) encryption is carried out within the range of the corner and at the top, namely, a pulling node is arranged in each layer in the vertical direction within one meter of the corner.
The pulling point is guaranteed to be firm and prevented from moving and deforming, the pulling point of the wall connecting piece 45 which is embedded in the outer wall of the building body and is pulled to be arranged within the range of 300mm of the connection point of the first cross rod 35 and the second cross rod 36 is increased when the length of the pulling point exceeds the length, and the wall connecting piece 45 is pulled to be connected with the inner vertical rod 32 and the outer vertical rod 31 firmly.
6) Unloading construction: and after the connection strength of the inclined hoisting steel rope 20 and the outer wall of the building body reaches 100% of the design strength, unloading the inclined hoisting steel rope 20.
7) Setting the scaffold board 42 and the foot blocking board 41: the inner vertical rod 32 is connected with a foot baffle plate 41, and the foot baffle plate 41 is positioned between the inner vertical rod 32 and the outer wall of the building body. A scaffold board 42 is laid between the inner vertical rod 32 and the outer vertical rod 31, and the scaffold board 42 is arranged on the first cross rod 35. It will be appreciated that the scaffold board 42 is a net of pockets. It should be understood that the bottom net is a common element, and those skilled in the art can select the specification, model and parameters according to actual requirements. The scaffold board 42 must be laid in place without leaving a void. It is understood that the toe board 41 is a stamped steel plate, and the height of the toe board 41 is 180 mm.
8) Setting a protective guard: the outer vertical rod 31 is fixedly provided with a protective railing 46, and the outer vertical surface of the outer vertical rod 31 is fully hung with a dense mesh type safety net 43. Preferably, the close-meshed safety net 43 is an 18# iron wire hanging safety net 43. The guard rail 46 is set to be 1.2m high. The inner side of the cantilever beam outer scaffold is formed with an adjacent edge, and the inner side of the cantilever beam outer scaffold is provided with a 0.9m protective railing 46 and a 18 cm-high skirting rod.
The cantilever beam outer leg hand frame is completely sealed by a template and a wood purlin 47 in the range between the bottom layer outer upright rod 31 and the building sideline, and is provided with a foot baffle plate 41 with the height of 180mm to prevent people from being injured by falling objects. The horizontal pocket net is arranged on the operation layer, the scaffold boards 42 are fully laid, and the joints of the safety net 43 must be tightly connected. The safety net 43 must be rigidly and securely attached to the structure. The use of damaged and decayed safety nets 43 is strictly prohibited. The bottom and the side of the cantilever beam outer scaffold are sealed by clamp plates.
9) After the building construction is completed, dismantling the cantilever beam outer scaffold: the demolition direction is circularly demolished from top to bottom according to floors. When the frame is disassembled, an operation area is divided, a rope bound fence or a vertical warning mark is arranged around the operation area, and a special person is arranged on the ground to command and forbid non-operation personnel from entering the operation area.
The rack dismounting procedure should follow the principle of mounting first and dismounting second from top to bottom, namely dismounting the scaffold board 42, the foot baffle board 41 and the shear support assembly 37 first and then dismounting the first cross rod 35, the second cross rod 36 and the vertical rod assembly.
The frame is not detached from the vertical surface or is detached from the vertical surface at the same time. So as to realize one-step one-cleaning and one-rod one-cleaning. When the outer upright rod 31 and the inner upright rod 32 are disassembled, the upright rods are firstly held, and then the last two buckles are disassembled. When the first cross bar 35, the transverse diagonal braces 44 and the cross brace components are removed, the middle fastener is firstly removed, then the middle is supported, and then the end fastener is removed. All the wall connecting pieces 45 and the like must descend synchronously along with the dismantling of the cantilever beam outer scaffold, the cantilever beam outer scaffold is dismantled after the wall connecting pieces 45 are strictly forbidden to be dismantled in whole or multiple layers, the height difference of the sectional dismantling is not more than 2 steps, and if the height difference is more than 2 steps, the wall connecting pieces 45 are added for reinforcement.
The stability of the frame body after being disassembled is not damaged, if the wall attaching rod is disassembled, a temporary support is added to prevent deformation, and when each standard section is disassembled, instability is prevented.
When the cantilever beam outer scaffold is disassembled to the last vertical rod at the lower part, a temporary cast support is firstly built at a proper position for reinforcement, and then the wall connecting piece 45 is disassembled.
During the dismantling process, the same components are required to be intensively classified and stacked, and then the ground is transported by using vertical transportation equipment without being carried in disorder, so that the components are prevented from being deformed and damaged.
The removal of the horizontal cantilever beam 10 is mainly assisted by a tower crane, a power tool. When the frame body is disassembled to the horizontal cantilever beam 10, firstly, the hanging rings are installed at 1/3-1/4 positions at two ends of the horizontal cantilever beam 10 which is made of I-shaped steel, after the hanging rings are lifted slowly to be firm and the steel wire rope is tensioned, the inclined hanging steel rope 20 at the cantilever end is disassembled on the premise of ensuring safety and reliability, and then the press ring steel bars and the wedges are fixed on the horizontal cantilever beam 10 to be disassembled.
The construction method for erecting the cantilever beam external scaffold comprises the following technical measures of utilizing a lightning protection system of a building, utilizing four-corner upright rods of a main building external scaffold, communicating a first cross rod 35 with lightning protection steel bars in structural columns of the building by using A12 round steel to form a lightning protection network, and detecting that the ground resistance is not more than 4 omega.
Regularly inspect cantilever beam outer scaffold, discovery problem and hidden danger, in time maintain before the construction operation and consolidate to reach firm stability, ensure construction safety.
The cantilever beam external scaffold prohibits the mixed construction of steel bamboo and steel wood and the mixed use of fasteners, ropes, iron wires, bamboo splits and plastic splits.
The scaffold boards 42 are strictly forbidden to have probe boards, and the construction load is balanced as far as possible when the scaffold boards 42 are laid and the multi-layer operation is carried out.
The integrity of the cantilever beam outer scaffold body is ensured, the cantilever beam outer scaffold body cannot be connected with a derrick and a lifter in a pulling mode, and the scaffold body cannot be cut off.
The construction load is strictly controlled, the scaffold board 42 cannot be piled up intensively for loading, and the construction load cannot be larger than 3kN/m2, so that larger safe storage is ensured.
During construction, only one layer of structure and decoration is allowed to operate simultaneously, or the number of layers of simultaneous operation during decoration construction is not more than two.
When the working floor is higher than the lower wall connecting piece 45 by more than 3.6m and the upper wall connecting piece 45 is not available, proper temporary bracing and pulling measures are taken.
And reliable protective fences are arranged between the operation layers to prevent falling objects from hurting people.
When the basic elevations built by the cantilever beam external scaffolds of the same building are different from each other, the first horizontal rod at the higher elevation position needs to be closed and arranged in a circle.
The dismantling safety technical measure of the cantilever beam outer scaffold is that before dismantling the scaffold, the cantilever beam outer scaffold to be dismantled is comprehensively checked, and an operation plan is drawn up according to the checking result.
When the frame is disassembled, an operation area is divided, a rope bound fence or a vertical warning mark is arranged around the operation area, and a special person is arranged on the ground to command and forbid non-operation personnel from entering the operation area.
When the vertical rod is disassembled, two workers are required to disassemble one vertical rod in a cooperative manner, the vertical rod is firstly held, then the last two fasteners are disassembled, and when the first cross rod 35, the transverse diagonal brace 44 and the shear brace component 37 are disassembled, the middle fastener is firstly disassembled, then the middle is supported, and then the end fastener is disassembled.
The wall connecting piece 45 should be dismantled layer by layer along with the dismantling progress, and when the throwing support is dismantled, the temporary support is used for supporting, and then the wall connecting piece can be dismantled.
The horizontal cantilever beam 10 made of I-shaped steel is adopted, so that the stability of the outer scaffold base is enhanced; the arrangement of the inclined hoisting steel rope 20 realizes the increase of the strength of the horizontal cantilever beam 10; the strength of the whole frame body is enhanced by arranging the first cross rod 35 above the second cross rod 36; the shear support components 37 are continuously arranged from bottom to top along the full width and the full height of the outer vertical surface of the outer vertical rod 31, so that the strength of the frame body is further enhanced; by adopting the erection construction method, the effects of improving the construction speed and enhancing the construction quality are realized.
The overhanging structure scaffold replaces a high-rise building to be erected from the ground, and overcomes the defects of high material consumption, long installation and disassembly time, long time consumption, high cost, difficult installation and disassembly, high danger, large material investment and the like of full-hall scaffolds. Compared with the traditional inclined stay rope 'embedded ring' of the cantilever frame, the labor is saved, the inclined stay rope can be recycled for many times, the length of the pull rod can be adjusted at any time to ensure the stability of the frame body, and the I-shaped steel can be reused. The invention aims to solve the construction problem of a plurality of overlong cantilever structures, and designs an I-shaped steel cantilever frame body platform which has a cantilever length of 3.6m and is anchored on a main body structure. The invention aims to solve the problem of eave structures with different overhanging widths, and selects an I-shaped rigid frame structure which is reasonable, reusable and free to combine into various widths. In order to solve the diversification of the height of the cantilever structure, a proper frame body pull-up or support-down mode is selected, and the applicability and the safety of the support frame body are improved.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that there are no specific structures but a few objective structures due to the limited character expressions, and that those skilled in the art may make various improvements, decorations or changes without departing from the principle of the invention or may combine the above technical features in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (10)
1. A construction method for constructing an I-steel scaffold by using a large-span overhanging structure of a high-rise cluster project is characterized by comprising the following steps:
1) setting a plurality of horizontal cantilever beams: the horizontal cantilever beam is made of I-shaped steel, one end of the horizontal cantilever beam, which is far away from the building outer wall, is connected with an inclined hoisting steel rope, and the other end of the inclined hoisting steel rope is positioned above the horizontal cantilever beam and is connected with the building outer wall;
2) set up multiunit pole setting subassembly: the vertical rod assemblies comprise outer vertical rods and inner vertical rods which are arranged in parallel and at intervals, the inner vertical rods are arranged opposite to the outer wall of the building body, the outer vertical rods and the inner vertical rods are connected through transverse sweeping rods, a plurality of groups of vertical rod assemblies are connected through longitudinal sweeping rods, the vertical rod assemblies are arranged on the horizontal cantilever beams, and the number of the vertical rod assemblies is the same as that of the horizontal cantilever beams and is arranged in a one-to-one mode;
3) setting a first cross rod and a second cross rod: a plurality of first cross rods and a plurality of second cross rods are arranged in the height direction of the vertical rod assembly at intervals, two ends of each first cross rod are respectively connected with the outer vertical rod and the inner vertical rod, the second cross rods are connected to the outer vertical rods, the end parts of the second cross rods are positioned at the joint of the first cross rods and the outer vertical rods, and the first cross rods are arranged above the second cross rods;
4) setting a shear support component: the outer vertical surface of the outer vertical rod is connected with a shear support component, and the vertical shear support component is continuously arranged from bottom to top along the full width and the full height of the outer vertical surface of the outer vertical rod;
5) and (3) wall connecting construction: the upright rod component is fixedly connected with a wall connecting piece embedded in the outer wall of the building body in a pulling manner;
6) unloading construction: after the connection strength of the inclined hoisting steel rope and the building outer wall reaches 100% of the design strength, unloading the inclined hoisting steel rope;
7) set up scaffold board and keep off the sole: a foot baffle plate is connected to the inner vertical rod and positioned between the inner vertical rod and the outer wall of the building body, and a scaffold plate is laid between the inner vertical rod and the outer vertical rod and arranged on the first cross rod;
8) setting a protective guard: the outer vertical rod is fixedly provided with a protective railing, and the outer vertical surface of the outer vertical rod is fully hung with a dense mesh type safety net;
9) after the building construction is completed, dismantling the cantilever beam outer scaffold: firstly, the scaffold board, the foot baffle board and the shear support assembly are disassembled, and then the first cross rod, the second cross rod and the vertical rod assembly are disassembled.
2. The construction method of the I-steel scaffold for the large-span overhanging structure of the high-rise cluster project according to claim 1, characterized in that: in the step 1), when the cantilever length of the horizontal cantilever beam is 1300mm and the anchoring length is 2000mm, 20 a-shaped I-steel is adopted.
3. The construction method of the I-steel scaffold for the large-span overhanging structure of the high-rise cluster project according to claim 1, characterized in that: in the step 1), when the cantilever length of the horizontal cantilever beam is 2000mm and the anchoring length is 3000mm, 25 a-size I-steel is adopted.
4. The construction method of the I-steel scaffold for the large-span overhanging structure of the high-rise cluster project according to claim 1, characterized in that: in the step 2), the vertical deviation of each inner vertical rod and each outer vertical rod is controlled to be less than or equal to 100 mm.
5. The construction method of the I-steel scaffold for the large-span overhanging structure of the high-rise cluster project according to claim 1, characterized in that: in the step 3), the extension length of the two ends of the first cross rod, which are far away from the inner vertical rod and the outer vertical rod respectively, is 150 mm.
6. The construction method of the I-steel scaffold for the large-span overhanging structure of the high-rise cluster project according to claim 1, characterized in that: in the step 4), the angle of the shear support component is set up to be 45-60 degrees.
7. The construction method of the I-steel scaffold for the large-span overhanging structure of the high-rise cluster project according to claim 1, characterized in that: and 4) after the shear support assembly is arranged, arranging transverse inclined supports at openings at two ends of the cantilever beam outer scaffold, wherein the transverse inclined supports are arranged between the same sections and are continuously distributed in a zigzag manner from bottom to top.
8. The construction method of the I-steel scaffold for the large-span overhanging structure of the high-rise cluster project according to claim 1, characterized in that: in the step 5), the pulling point of the vertical rod component and the wall connecting piece pulling joint pre-embedded in the outer wall of the building body is arranged within 300mm of the connecting point of the first cross rod and the second cross rod.
9. The construction method of the I-steel scaffold for the large-span overhanging structure of the high-rise cluster project according to claim 1, characterized in that: in the step 7), the foot blocking plate is a stamped steel plate, and the height of the foot blocking plate is 180 mm.
10. The construction method of the I-steel scaffold for the large-span overhanging structure of the high-rise cluster project according to claim 1, characterized in that: and 2) welding a positioning steel bar with the outer diameter of 25mm on the horizontal cantilever beam, and sleeving the vertical rod assembly outside the positioning steel bar.
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Cited By (1)
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| CN114991460A (en) * | 2022-07-07 | 2022-09-02 | 中建二局第三建筑工程有限公司 | Truss track overhanging I-steel installation method |
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