CN112431407A - Construction method for formwork of building main body cantilever structure - Google Patents
Construction method for formwork of building main body cantilever structure Download PDFInfo
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- CN112431407A CN112431407A CN202011575441.6A CN202011575441A CN112431407A CN 112431407 A CN112431407 A CN 112431407A CN 202011575441 A CN202011575441 A CN 202011575441A CN 112431407 A CN112431407 A CN 112431407A
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- cantilever structure
- upper side
- formwork
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- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000009415 formwork Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 description 4
- 239000004567 concrete Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Classifications
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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
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/06—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall
- E04G13/066—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall for overhangs
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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
- E04G1/00—Scaffolds primarily resting on the ground
-
- 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
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
-
- 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
- E04G5/001—Safety or protective measures against falling down relating to scaffoldings
Abstract
A construction method for a formwork of a building main body cantilever structure belongs to the technical field of support system construction. The method is characterized in that: the method comprises the following steps: step 1), arranging a crown beam (7) on the upper side of a foundation pit support column (6); step 2) arranging a main beam (4) between the upper side of the garage top plate of the main structure and the crown beam (7); and step 3) erecting a support frame body (1) on the upper sides of the garage top plate and the main beam (4), erecting a scaffold (2) on the upper side of the main beam (4), and completing the erection of the support frame body (1). The construction method for the cantilever structure formwork of the building main body perfectly connects the lower support frame body of the cantilever outer eaves and the inner floor formwork support body into a whole, so that the overall stability is greatly improved; meanwhile, the height of the support frame body of the overhanging outer eaves part is reduced, and the safety is greatly improved.
Description
Technical Field
A construction method for a formwork of a building main body cantilever structure belongs to the technical field of support system construction.
Background
At present, most of large projects are basically located in deep foundation pits in the construction process, and project main bodies are close to the edges of the foundation pits due to narrow construction sites; when the construction of the main body stage reaches +/-0.00 and an overhung outer eave which is too wide exists on the outer side of the main body on the ground, the overhung outer eave is positioned at the upper part of the deep foundation pit, and the lower foundation pit is not backfilled, so that a support system at the lower part is very difficult to set up during the construction of the overhung outer eave following the main body. Because of every layer of ground upper prop outside all has the outer eaves of the structure of encorbelmenting that 1.4~2.0m width varies, and the basement outer wall only has the unequal distance of 1.5~3.8m width apart from the foundation ditch outside, the basement outrigger can't lead to upper portion, the outer frame standard requirement of underground protection can't regard as the inner support die carrier body to use, if begin to set up to the structure eaves construction layer from the foundation ditch bottom because of the support body, the support body height is too high, support body bottom is not in the coplanar simultaneously, support body bottom is unstable.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the construction method of the cantilever structure formwork of the building main body, which reduces the height of the support frame body of the cantilever outer eaves part and greatly improves the safety, is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: the construction method for the formwork of the cantilever structure of the building main body is characterized by comprising the following steps of: the method comprises the following steps:
step 1) arranging a crown beam on the upper side of a foundation pit support column;
step 2) arranging a main beam between the upper side of the garage top plate of the main structure and the crown beam;
and 3) erecting support frames on the top plate of the garage and the upper side of the main beam, erecting a scaffold on the upper side of the main beam, and completing the erection of the support frames.
Preferably, the crown beam described in step 1) or 2) is arranged around the body structure. The crown beam is in a ring shape arranged around the main body structure, so that the strength of the crown beam main body is high.
Preferably, a support column is arranged between the main beam and the crown beam in the step 2), so that the main beam is kept horizontal. The girder level can be guaranteed to the support column, and then has guaranteed that support body and scaffold frame are more stable. The supporting columns connect the crown beam and the foundation pit supporting piles into a whole, so that the safety, the stability and the bearing strength of the crown beam are improved.
Preferably, the support pillar is of a reinforced concrete structure. The construction is convenient, and the combination with the crown beam is tight.
Preferably, the supporting columns are arranged at intervals along the crown beam, and the distance between every two adjacent supporting columns is 900 mm. The interval of every adjacent support column is 900mm, has guaranteed that the interval of girder is moderate, makes things convenient for the support of support body and scaffold to establish.
Preferably, the upper side of the garage top plate in the step 2) is provided with a reserved U-shaped bolt, and the main beam is fixed on the upper side of the garage top plate through the reserved U-shaped bolt. The girder is fixed with garage roof structure through reserving U type bolt, safe and reliable.
Preferably, each main beam in the step 2) is formed by splicing two I-shaped steels arranged side by side, and the two I-shaped steels are connected by adopting a connecting piece after being welded. The girder is formed by splicing two rows of I-shaped steel, so that the high supporting strength of the girder is ensured.
Preferably, the connecting piece comprises a connecting piece U-shaped bolt with an upward opening and a pressing plate, the two I-shaped steels are arranged in the connecting piece U-shaped bolt, the pressing plate is arranged on the upper sides of the I-shaped steels, and two locking nuts for pressing the pressing plate are arranged on the connecting piece U-shaped bolt side by side. The two I-shaped steels of the main beam are locked through the connecting piece U-shaped bolt and the pressing plate, so that the strength of the main beam is high.
Preferably, the upper side of the main beam in the step 3) is provided with a plurality of positioning rods for positioning the support frame body. The locating lever has made things convenient for setting up of support body and scaffold frame.
Preferably, a double-layer bottom-pocket safety net is arranged at the lower side of the scaffold in the step 3). The double-layer bottom-pocket safety net has good protection effect.
Compared with the prior art, the invention has the beneficial effects that:
the construction method for the cantilever structure formwork of the building main body perfectly connects the lower supporting frame body of the cantilever outer eaves and the outer scaffold body into a whole, so that the overall stability is greatly improved; reduced the support body height of overhanging outer eaves part simultaneously, the security has been improved greatly, this position construction only needs carry out the location of the reservation of bolt in earlier stage pre-buried and corresponding supporting platform, can carry out the installation of later stage girder I-steel and the setting up of support body, need not set up support body to the construction layer from the foundation ditch bottom again after demolising the outer scaffold frame in garage, work efficiency is improved, girder construction process is shelved to the shaped steel, can carry out the above-ground structure work progress stage, do not hinder this position underground waterproof construction, only need with corresponding construction position set up safe pocket net and protection in the support body bottom can.
Drawings
Fig. 1 is a schematic diagram of a principle of a formwork system of a building main body cantilever structure.
Fig. 2 is a schematic view of the main beam fixation.
In the figure: 1. the support frame body 2, the scaffold 3, the garage outer wall 4, the main beam 5, the reserved U-shaped bolt 6, the foundation pit support pile 7, the crown beam 8, the support column 9, the double-layer bottom-pocket safety net 10, the side support frame 11, the pull rod 12, the pull rope 13, the I-shaped steel 14, the connecting piece U-shaped bolt 15, the pressing plate 16 and the locking nut.
Detailed Description
FIGS. 1-2 illustrate preferred embodiments of the present invention, and the present invention will be further described with reference to FIGS. 1-2.
As shown in FIGS. 1-2: a construction method for a formwork of a building main body cantilever structure comprises the following steps:
step 1) arranging a crown beam 7 on the upper side of the foundation pit support column 6.
The garage top plate of the main structure is a +/-0.00 plate surface of the main structure. Firstly, according to the distance between the garage outer wall 3 and the edge of the foundation pit and the actual situation on site, before concrete pouring of a main structure +/-0.00 slab, the arrangement position of the main beam 4 is determined on a drawing, then the positions of the U-shaped bolt 5 and the support column 8 are positioned and reserved according to the drawing, and accurate marking is required.
Because the basement outer wall is 3.8m away from the biggest width in foundation ditch outside, No. 18I-steel that 7500mm is long is adopted to girder 4, according to calculation load value and span width.
Each main beam 4 comprises two I-shaped steels 13 arranged side by side, the two I-shaped steels 13 are welded, and a connecting piece is arranged between the two I-shaped steels 13. The connecting piece comprises a connecting piece U-shaped bolt 14 and a pressing plate 15, the opening of the connecting piece U-shaped bolt 14 is arranged upwards, the two I-shaped steels 13 are arranged in the connecting piece U-shaped bolt 14, the pressing plate 15 is arranged on the upper sides of the I-shaped steels 13, and the upper end of the connecting piece U-shaped bolt 14 penetrates through the corresponding end of the pressing plate 15 and then is in threaded connection with a locking nut 16. The connecting pieces are arranged at intervals along the length direction of the main beam 4 so as to improve the strength of the main beam 4.
And erecting a template on the upper side of the foundation pit supporting pile 6, binding reinforcing steel bars, pouring concrete to form a crown beam 7, arranging the crown beam 7 around the main structure, and connecting the top of the foundation pit supporting pile 6 with the crown beam 7.
And 2) arranging a main beam 4 between the upper side of the garage top plate of the main structure and the crown beam 7.
Because foundation ditch support pile 6 is lower than major structure 0.00m, is more low than the height of garage roof promptly, consequently in order to guarantee that main girder 4 is horizontal, need set up support column 8 at the upside of hat roof beam 7. The supporting column 8 is of a reinforced concrete structure, the cross section of the supporting column 8 is 300mm multiplied by 300mm square, the internal reinforcement of the supporting column 8 is HRB400, the main reinforcement is not less than 4 mm 14, the stirrup is phi 8@200mm, the lower part of the column is provided with a 600 mm multiplied by 600 mm column pier foundation, and the internal reinforcement is HRB400 phi 8@200mm bidirectional reinforcement. The supporting columns 8 are arranged at intervals along the crown beam 7, and the center distance between every two adjacent supporting columns 8 is 900 mm.
The main beam 4 is installed, the end part of the main beam 4 is fixed through the reserved U-shaped bolt 5, the top of the support column 8 is also fixed to the main beam 4 through the embedded part, and the position stability of the main beam 4 is guaranteed.
And step 3) erecting a support frame body 1 on the top plate of the garage and the upper side of the main beam 4, erecting a scaffold 2 on the upper side of the main beam 4, and completing the erection of the support frame body 1.
Support frame body 1 and scaffold frame 2 are set up to the upside of garage roof and girder 4. Wherein, support body 1 is including setting up the interior support body and the outer support body of setting 4 upsides at the girder at the garage roof upside, and outer support body sets up outside the garage roof to be located the upside of girder 4. The upper sides of the main beams 4 are provided with vertical rods to form positioning rods, six positioning rods are arranged on each main beam 4 along the length direction, wherein four positioning rods close to the inner ends of the main beams 4 are inner support frame body positioning rods, and two positioning rods close to the outer ends of the main beams 4 are outer support frame body positioning rods. Scaffold 2 sets up two rows, and the interval is 900mm, and scaffold 2's bottom is provided with double-deck pocket bottom safety net 9.
The interval of the vertical rods of the inner support frame body is 900mm, the inner support frame body on the upper portion of the main beam 4 is connected with the support frame body 1 on the upper side of the garage top plate, and the partial interval is adjusted as required. The vertical distance of the vertical rods of the scaffold 2 is 900mm, the transverse distance of the vertical rods is 900mm, and the step distance is 1800 mm.
Both sides of the support frame body 1 on the upper side of the main beam 4 are provided with side support rods, the side support rods are provided with a plurality of side support rods from bottom to top, the adjacent ends of every two adjacent side support rods are connected, and every two adjacent side support rods are intersected to form a side support frame 10 of the substructure.
Be provided with stay cord 12 between girder 4 and the roof beam of upper strata pouring, stay cord 12 is wire rope, and pre-buried rings that have on the roof beam of upper strata pouring, the upper end of stay cord 12 links to each other with rings, and the lower extreme links to each other with girder 4, and stay cord 12 is for keeping away from the slope form that supports support body 1 from top to bottom gradually to improve girder 4's intensity.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. A construction method for a formwork of a building main body cantilever structure is characterized by comprising the following steps: the method comprises the following steps:
step 1), arranging a crown beam (7) on the upper side of a foundation pit support column (6);
step 2) arranging a main beam (4) between the upper side of the garage top plate of the main structure and the crown beam (7);
and step 3) erecting a support frame body (1) on the upper sides of the garage top plate and the main beam (4), erecting a scaffold (2) on the upper side of the main beam (4), and completing the erection of the support frame body (1).
2. The formwork erecting construction method for the cantilever structure of the main building body according to claim 1, wherein: the crown beam (7) in the step 1) or 2) is arranged around the main body structure.
3. The formwork erecting construction method for the cantilever structure of the main building body according to claim 1, wherein: a support column (8) is arranged between the main beam (4) and the crown beam (7) in the step 2), so that the main beam (4) is kept horizontal.
4. The formwork erecting construction method for the cantilever structure of the main building body according to claim 3, wherein: the support column (8) is of a reinforced concrete structure.
5. The formwork erecting construction method for the cantilever structure of the building main body according to claim 3 or 4, wherein: the supporting columns (8) are arranged at intervals along the crown beam (7), and the distance between every two adjacent supporting columns (8) is 900 mm.
6. The formwork erecting construction method for the cantilever structure of the main building body according to claim 1, wherein: and 2), a reserved U-shaped bolt (5) is arranged on the upper side of the garage top plate, and the main beam (4) is fixed on the upper side of the garage top plate through the reserved U-shaped bolt (5).
7. The formwork erecting construction method for the cantilever structure of the main building body according to claim 1, wherein: each main beam (4) in the step 2) is formed by splicing two I-shaped steels (13) arranged side by side, and the two I-shaped steels (13) are connected by adopting a connecting piece after being welded.
8. The formwork erecting construction method for the cantilever structure of the main building body according to claim 7, wherein: the connecting piece comprises a connecting piece U-shaped bolt (14) with an upward opening and a pressing plate (15), the two I-shaped steels (13) are arranged in the connecting piece U-shaped bolt (14), the pressing plate (15) is arranged on the upper side of the I-shaped steel (13), the connecting piece U-shaped bolt (14) is provided with two locking nuts (16) for pressing the pressing plate (15), and the two locking nuts (16) are arranged side by side.
9. The formwork erecting construction method for the cantilever structure of the main building body according to claim 1, wherein: a plurality of positioning rods used for positioning the support frame body (1) are arranged on the upper side of the main beam (4) in the step 3).
10. The formwork erecting construction method for the cantilever structure of the main building body according to claim 1, wherein: a double-layer bottom-pocket safety net (9) is arranged at the lower side of the scaffold (2) in the step 3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011575441.6A CN112431407A (en) | 2020-12-28 | 2020-12-28 | Construction method for formwork of building main body cantilever structure |
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| CN202011575441.6A CN112431407A (en) | 2020-12-28 | 2020-12-28 | Construction method for formwork of building main body cantilever structure |
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| CN112431407A true CN112431407A (en) | 2021-03-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115162350A (en) * | 2022-07-07 | 2022-10-11 | 中国华冶科工集团有限公司 | Supporting system and supporting method for cantilever beam plate under condition of vertical support of ultra-deep foundation pit |
| CN115522740A (en) * | 2022-10-19 | 2022-12-27 | 中国二十二冶集团有限公司 | Earthing upper beam plate formwork construction method |
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2020
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| US20180044907A1 (en) * | 2016-08-12 | 2018-02-15 | Wuhan Zhihe Geotechnical Engineering Co., Ltd | Inverse construction method for deep, large and long pit assembling structure of suspension-type envelope enclosure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115162350A (en) * | 2022-07-07 | 2022-10-11 | 中国华冶科工集团有限公司 | Supporting system and supporting method for cantilever beam plate under condition of vertical support of ultra-deep foundation pit |
| CN115162350B (en) * | 2022-07-07 | 2024-04-16 | 中国华冶科工集团有限公司 | Support system and support method for cantilever beam plate under ultra-deep foundation pit vertical support condition |
| CN115522740A (en) * | 2022-10-19 | 2022-12-27 | 中国二十二冶集团有限公司 | Earthing upper beam plate formwork construction method |
| CN115522740B (en) * | 2022-10-19 | 2023-09-22 | 中国二十二冶集团有限公司 | Construction method for formwork of earthing upper beam plate |
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Application publication date: 20210302 |