CN113668850A - Steel beam holding supporting system of formwork support frame and construction method thereof - Google Patents
Steel beam holding supporting system of formwork support frame and construction method thereof Download PDFInfo
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- CN113668850A CN113668850A CN202110856563.0A CN202110856563A CN113668850A CN 113668850 A CN113668850 A CN 113668850A CN 202110856563 A CN202110856563 A CN 202110856563A CN 113668850 A CN113668850 A CN 113668850A
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- steel beam
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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
- E04G13/04—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for lintels, beams, or transoms to be encased separately; Special tying or clamping means therefor
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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
- E04G25/00—Shores or struts; Chocks
-
- 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
- E04G25/00—Shores or struts; Chocks
- E04G25/02—Shores or struts; Chocks non-telescopic
-
- 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
- E04G25/00—Shores or struts; Chocks
- E04G2025/003—Supports therefor, e.g. tripods
Abstract
The invention discloses a steel beam holding support system of a formwork support frame and a construction method thereof, the steel beam holding support system comprises a steel beam, steel beam holding supports fixed on the steel beam at even intervals, and special-shaped limiting components for limiting the steel beam holding supports on the steel beam, the formwork support frame is fixed on the steel beam holding supports, each steel beam holding support comprises a support transverse part vertical to the extension direction of the steel beam and arranged on the upper surface of the steel beam, a support vertical part fixed on the lower surface of the support transverse part and on the side edge of the support transverse part and simultaneously abutted against the upper flange of the steel beam and the lower flange of the steel beam, and a support inclined part obliquely connected between the support transverse part and the support vertical part, each special-shaped limiting component comprises two first limiting components arranged between the support vertical part and the upper flange of the steel beam and between the support vertical part and the lower flange of the steel beam, and a second limiting component arranged between the support transverse part and the upper flange of the steel beam, and provides a stable fulcrum for the formwork support, the waste of material cost and labor cost caused by the fact that the beam formwork support frame is erected in a full space with the ground as a fulcrum is avoided.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a steel beam holding supporting system of a formwork support frame and a construction method thereof.
Background
With the rise of modern building layers becoming higher and higher, in the construction of reinforced concrete structures, if a top beam is of a concrete structure, the laying of a template is required, wherein the lower part of the top beam only has steel beams without stable supporting points of a formwork.
Disclosure of Invention
The invention aims to provide a steel beam holding supporting system of a formwork support frame and a construction method thereof, and aims to solve the technical problems that a full construction support needs to be erected on site when a formwork of a top concrete structural beam in a building with a higher floor height is erected, the operation is complicated, and the stability is poor.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a template formwork's girder steel of embracing supports system, includes the girder steel, fixes at even interval on the girder steel embrace the girder steel support and will embrace the spacing subassembly of dysmorphism that the girder steel supported spacing on the girder steel, supports template formwork and fixes on embracing the girder steel support, embrace the girder steel support including perpendicular girder steel extending direction, locate the support horizontal part of girder steel upper surface, fix and support the vertical part that supports horizontal part lower surface, side and girder steel top flange and girder steel bottom flange conflict simultaneously, and the oblique portion of support of slant connection between supporting horizontal part and supporting vertical part, the spacing subassembly of dysmorphism includes two first limiting member that set up between supporting vertical part and girder steel top flange, between supporting vertical part and girder steel bottom flange, and locate the second limiting member between supporting horizontal part and girder steel top flange, first limiting member homogeneous end is fixed on supporting vertical part, the first limiting member homogeneous end is fixed on supporting vertical part, The other end of the steel beam bearing device supports the bottom surface of the steel beam upper flange or the steel beam lower flange, the second limiting component is fixed on the supporting transverse part and clamped on one side of the steel beam upper flange far away from the supporting vertical part, a limiting plate used for limiting the steel beam upper flange is arranged on the second limiting component, and a space defined by the limiting plate, the second limiting component and the first limiting component is a limiting space of the steel beam upper flange.
Further, first stop component is the C type structure that the opening orientation supported the setting of vertical section, including last horizontal portion, vertical section and lower horizontal portion, is formed by the steel cold bending that thickness is 5~10mm, and last horizontal portion is long: the vertical part is long: the length of the lower transverse part is 1: 2, the upper transverse part is 30-90 mm long.
Furthermore, the second limiting member comprises a first supporting part supported on the bottom surface of the upper flange of the steel beam, a second supporting part supported on the bottom surface of the supporting cross part and an inclined support connected between the first supporting part and the second supporting part.
Furthermore, the second stop component is 5~10mm steel forming for integrated into one piece's thickness, first supporting part is the opening and supports the C type structure that vertical portion set up dorsad, including first lateral part, first perpendicular portion and second lateral part, and first lateral part, first perpendicular portion and second lateral part enclose into the anti-deformation space, the second supporting part is the third lateral part of butt under the supporting lateral part, the bracing is the slant backup pad of connection between second lateral part and third lateral part.
Furthermore, the inclined angle between the inclined strut and the second supporting part is 90-150 degrees.
Further, the first transverse portion is long: the first vertical part is long: second horizontal portion length: the third transverse length is 2: 1: 2: 1.5.
furthermore, between first horizontal portion and the support horizontal portion, all fixed through split bolt between third horizontal portion and the support horizontal portion, the limiting plate is located on the first horizontal portion top surface between split bolt and the girder steel top flange.
Furthermore, the supporting transverse part is provided with a limiting reinforcing steel bar for preventing the beam formwork from sliding, and the limiting reinforcing steel bar is vertically fixed on the upper surface of the supporting transverse part.
A construction method of a steel beam-embracing supporting system of a formwork support frame comprises the following steps:
And 2, hoisting the welded steel beam holding support on a steel beam below the concrete beam, erecting the support transverse part perpendicular to the extension line direction of the steel beam on the upper surface of the steel beam, and butting the side edge of the support vertical part against the same side of the steel beam upper flange and the steel beam lower flange.
And 3, welding the two manufactured first limiting members on the supporting vertical part, and respectively supporting the upper transverse plates of the two first limiting members on the upper flange of the steel beam and the lower surface of the lower flange of the steel beam.
And 4, installing two split bolts at preset positions of the supporting transverse part, clamping the manufactured second limiting component at preset positions of the supporting transverse part and the lower surface of the steel beam lower flange, and then enabling the two split bolts to penetrate through the first transverse part and the third transverse part and be respectively attached and fixed to the lower surfaces of the steel beam lower flange and the supporting transverse part through nuts.
And 5, welding limiting steel bars on the supporting transverse part according to the positions of the formwork support frames of the formworks, inserting the lower ends of the steel pipes for erecting the formwork into the limiting steel bars, erecting the formwork on the concrete beam at the positions of the limiting steel bars, and completing construction of a steel beam supporting system of the formwork support frames.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
according to the invention, the steel beam support is arranged on the steel beam, a fulcrum is provided for the formwork support for supporting the concrete structure beam, waste of material cost and labor cost caused by full erection of the beam formwork support with the ground as the fulcrum is avoided, the steel beam support and the steel beam are more stably clasped by arranging the first limiting members on the lower surfaces of the upper flange and the lower flange of the support vertical part and the steel beam and arranging the second limiting members on the upper flange of the support transverse part and the steel beam, so that the steel beam support provides more stable support for the beam formwork support, and the first limiting members and the second limiting members are both provided with deformation-resistant spaces, so that the stability of connection of the steel beam support and the steel beam is enhanced.
According to the invention, the limiting reinforcing steel bars are fixed on the supporting transverse parts, and the steel pipes below the beam template support frame are sleeved on the limiting reinforcing steel bars, so that the beam template support frame is prevented from sliding on the steel beam holding support, the stability of the beam template support frame is further increased, and the beam template support frame has the characteristics of safety, applicability and the like, has good popularization and practical values, and can generate good economic benefits after being widely popularized and applied.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
fig. 3 is an enlarged view of fig. 1 at B.
Reference numerals: 1. a steel beam; 11. a steel beam upper flange; 12. a steel beam lower flange; 2. supporting the steel-holding beam; 21. a support lateral part; 22. a support vertical portion; 23. a support ramp; 3. limiting the reinforcing steel bars; 4. a first stop member; 41. an upper transverse portion; 42. a vertical portion; 43. a lower lateral portion; 5. a second stop member; 51. a first lateral portion; 52. a first vertical portion; 53. a second transverse portion; 54. bracing; 55. a third transverse portion; 6. a limiting plate; 7. oppositely pulling the bolts; a. the upper transverse part is long; b. the vertical part is long; c. the lower transverse part is long; d. the first transverse portion is long; e. the first vertical section is long; f. the second transverse portion is long; g. the third transverse portion is long.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention is further described below.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
As shown in fig. 1, the invention discloses a steel beam holding support system of a formwork support frame, which comprises a steel beam 1, a steel beam holding support 2 for supporting the formwork support frame, and a special-shaped limiting assembly for limiting the steel beam holding support 2 on the steel beam 1, wherein the steel beam 1 is made of an i-steel material, the steel beam holding support 2 is made of a # 12 double-channel steel material, the formwork support frame is arranged on the steel beam holding support 2, and the steel beam holding support 2 provides a stable pivot for the formwork support structure for supporting a concrete beam.
Embrace girder steel and support 2 and include 1 extending direction of perpendicular girder steel, locate the support lateral part 21 of 1 upper surface of girder steel, the welding of perpendicular support lateral part 21 is at the support vertical part 22 that supports the lateral part 21 lower surface, and support vertical part 22 free end and the support oblique part 23 that supports 21 tip slant welded enhancement of lateral part and embrace girder steel and support 2 structural strength, support lateral part 21, support vertical part 22 and support oblique part 23 and constitute stable triangle-shaped structure jointly, support lateral part 21 and arrange in on girder steel 1, support vertical part 22 and girder steel top flange 11 and girder steel bottom flange 12 homonymy and contradict, support lateral part 21 upper surface vertical fixation has the spacing reinforcing bar 3 that prevents that beam template formwork from taking place to slide, the steel pipe cover under the beam template formwork takes place on spacing reinforcing bar 3.
Spacing subassembly of dysmorphism includes will embrace girder steel support 2 and girder steel top flange 11 and girder steel bottom flange 12 spacing two first stop component 4 and will embrace girder steel support 2 and girder steel top flange 11 fixed second stop component 5, and first stop component 4 is the C type structure that two openings orientation support vertical section 22 set up, including last horizontal part 41, vertical section 42 and lower horizontal part 43, is 5~10 mm's steel forming by thickness, the last horizontal length a: length of vertical part b: the lower transverse portion length c is 1: 1: 2, the length a of the upper transverse part is 10-20 mm, the upper transverse parts 41 of the two first limiting members 4 respectively support the lower surfaces of the steel beam upper flange 11 and the steel beam lower flange 12, the open ends of the lower transverse parts 43 of the two first limiting members 4 are fixedly connected with the supporting vertical parts 22, so as to vertically limit the steel beam holding support 2 on the steel beam 1, the second limiting member 5 comprises a first supporting part supported on the bottom surface of the steel beam upper flange 11, a second supporting part supported on the bottom surface of the supporting transverse part 21 and an inclined support 54 connected between the first supporting part and the second supporting part, the second limiting member 5 is formed by cold bending of steel with the thickness of 5-10 mm in an integrated mode, the first supporting part is a C-shaped structure with an opening back to the supporting vertical parts 22 and comprises a first transverse part 51, a first vertical part 52 and a second transverse part 53, and the first transverse part 51, the first vertical part 52 and the second transverse part 53 enclose a deformation-resistant space, the second supporting portion is the third horizontal portion 55 of butt under supporting horizontal portion 21, and bracing 54 is the slant support plate of connection between second horizontal portion 53 and third horizontal portion 55, and bracing and second supporting portion contained angle are 90~150, first horizontal portion length d: first vertical length e: second lateral length f: third transverse length g is 2: 1: 2: 1.5, be equipped with the limiting plate 6 that is used for spacing girder steel top flange 11 on the second stop component 5, first horizontal portion 51 and support between the horizontal portion 21, third horizontal portion 55 and support are all fixed through split bolt 7 between the horizontal portion 21, limiting plate 6 is located on the first horizontal portion 51 top surface between split bolt 7 and the girder steel top flange 11, limiting plate 6 equals with the length of girder steel top flange 11 to the distance of supporting perpendicular portion 22, limiting plate 6 with support perpendicular portion 22 restrict jointly and embrace the girder steel and support lateral shifting on the girder steel, thereby will embrace girder steel support 2 and fix on girder steel 1.
A construction method of a steel beam-embracing supporting system of a formwork support frame comprises the following steps:
And 2, hoisting the welded steel beam holding support 2 on a steel beam below the concrete beam, so that the support transverse part 21 is erected on the upper surface of the steel beam in a direction perpendicular to the extension line of the steel beam, and the side edge of the support vertical part 22 is abutted against the same side of the steel beam upper flange 11 and the steel beam lower flange 12.
And 3, welding the two manufactured first limiting members 4 on the supporting vertical part 22, so that the upper transverse plates of the two first limiting members 4 are respectively supported on the lower surfaces of the steel beam upper flange 11 and the steel beam lower flange 12.
And 4, mounting two split bolts at preset positions of the supporting transverse part 21, clamping the manufactured second limiting member 5 at the preset positions of the lower surfaces of the supporting transverse part 21 and the steel beam lower flange 12, penetrating the two split bolts through the first transverse part 51 and the third transverse part 55, and respectively attaching and fixing the two split bolts to the lower surfaces of the steel beam lower flange 12 and the supporting transverse part 21 through nuts.
And 5, welding limiting steel bars 3 on the supporting transverse part 21 according to the positions of the formwork supporting frames of the formwork, inserting the lower ends of the steel pipes for erecting the formwork into the limiting steel bars 3, erecting the formwork on the concrete beams at the positions of the limiting steel bars 3, and completing construction of a steel beam supporting system of the formwork supporting frames.
The steel beam support is arranged on the steel beam, a fulcrum is provided for the formwork support for supporting the concrete structure beam, waste of material cost and labor cost caused by full erection of the beam formwork support with the ground as the fulcrum is avoided, the steel beam support and the steel beam are more stably clasped by arranging the first limiting members on the lower surfaces of the upper flange and the lower flange of the support vertical part and the steel beam and arranging the second limiting members on the upper flange of the support transverse part and the steel beam, so that the steel beam support provides more stable support for the beam formwork support, the limiting steel bars are fixed on the support transverse part, the steel pipe below the beam formwork support is sleeved on the limiting steel bars, the beam formwork support is prevented from sliding on the steel beam support, and the stability of the beam formwork support is further improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A steel beam holding support system of a formwork support frame comprises a steel beam (1), steel beam holding supports (2) fixed on the steel beam (1) at uniform intervals, and special-shaped limiting assemblies for limiting the steel beam holding supports (2) on the steel beam (1), wherein the formwork support frame is fixed on the steel beam holding supports (2), the formwork support system is characterized in that the steel beam holding supports (2) comprise a support transverse part (21) perpendicular to the extending direction of the steel beam (1) and arranged on the upper surface of the steel beam (1), a support vertical part (22) fixed on the lower surface of the support transverse part (21) and abutted against an upper flange (11) and a lower flange (12) of the steel beam at the same time, and support inclined parts (23) obliquely connected between the support transverse part (21) and the support vertical part (22), the special-shaped limiting assemblies comprise two first limiting members (4) arranged between the support vertical part (22) and the upper flange (11) of the steel beam and between the support vertical part (22) and the lower flange (12) of the steel beam, and locate second stop component (5) between supporting horizontal portion (21) and girder steel top flange (11), first stop component (4) uniform end is fixed on supporting vertical portion (22), the other end bearing girder steel top flange (11) or the bottom surface of girder steel bottom flange (12), second stop component (5) are fixed on supporting horizontal portion (21) and the centre gripping is keeping away from supporting girder steel top flange (11) one side of vertical portion (22), are equipped with limiting plate (6) that are used for spacing girder steel top flange (11) on second stop component (5), the spacing space that limiting plate (6), second stop component (5), first stop component (4) three enclose is the spacing space of girder steel top flange (11).
2. The steel beam supporting system of the formwork support frame as claimed in claim 1, wherein the first limiting member (4) is a C-shaped structure with an opening facing the supporting vertical part (22), comprises an upper transverse part (41), a vertical part (42) and a lower transverse part (43), and is formed by cold bending steel with the thickness of 5-10 mm, and the upper transverse part is long (a): vertical length (b): the lower transverse length (c) is 1: 2, the upper transverse part length (a) is 30-90 mm.
3. The girder-embracing supporting system of a formwork support frame according to claim 1, wherein the second position-limiting member (5) comprises a first supporting portion supported on the bottom surface of the upper flange (11) of the girder, a second supporting portion supported on the bottom surface of the supporting cross portion (21), and a diagonal brace (54) connected between the first supporting portion and the second supporting portion.
4. The steel beam supporting system of the formwork support frame according to claim 3, wherein the second limiting member (5) is an integrally formed structure and is formed by cold bending steel with a thickness of 5-10 mm, the first supporting part is a C-shaped structure with an opening facing away from the supporting vertical part (22) and comprises a first transverse part (51), a first vertical part (52) and a second transverse part (53), the first transverse part (51), the first vertical part (52) and the second transverse part (53) enclose a deformation-resistant space, the second supporting part is a third transverse part (55) abutting against the supporting transverse part (21), and the inclined support (54) is an inclined supporting plate connected between the second transverse part (53) and the third transverse part (55).
5. The steel beam supporting system of the formwork support frame as claimed in claim 3, wherein the angle between the diagonal brace (54) and the second supporting portion is 90-150 °.
6. A steel-embracing beam support system of a formwork support frame according to claim 4, wherein the first cross length (d): first vertical length (e): second transverse length (f): third transverse length (g) is 2: 1: 2: 1.5.
7. the steel beam holding support system of the formwork support frame according to claim 3, wherein the first transverse portion (51) and the support transverse portion (21) and the third transverse portion (55) and the support transverse portion (21) are fixed through the split bolt (7), and the limiting plate (6) is arranged on the top surface of the first transverse portion (51) between the split bolt (7) and the steel beam upper flange (11).
8. The steel beam supporting system of the formwork support frame of the formwork as claimed in claim 1, wherein the supporting cross part (21) is provided with a limiting steel bar (3) for preventing the beam formwork support frame from slipping, and the limiting steel bar (3) is vertically fixed on the upper surface of the supporting cross part (21).
9. The construction method of the steel beam-embracing supporting system of the formwork support frame according to any one of claims 1 to 8, characterized by comprising the following steps:
step 1, welding a proper number of steel beam holding supports (2) on the ground by using double channel steel according to the specification and the size of the steel beam and the length of the concrete beam;
step 2, hoisting the welded steel beam holding support (2) on a steel beam below the concrete beam, so that a support transverse part (21) is erected on the upper surface of the steel beam in a direction perpendicular to the extension line of the steel beam, and the side edge of a support vertical part (22) is abutted against the same side of a steel beam upper flange (11) and a steel beam lower flange (12);
step 3, welding the two manufactured first limiting members (4) on the supporting vertical part (22), and respectively supporting the upper transverse plates of the two first limiting members (4) on the lower surfaces of the steel beam upper flange (11) and the steel beam lower flange (12);
step 4, installing two split bolts at preset positions of the supporting transverse part (21), clamping the manufactured second limiting component (5) at the preset positions of the lower surfaces of the supporting transverse part (21) and the steel beam lower flange (12), penetrating the two split bolts (7) through the first transverse part (51) and the third transverse part (55), and respectively attaching and fixing the two split bolts to the lower surfaces of the steel beam lower flange (12) and the supporting transverse part (21) through nuts;
and 5, welding limiting steel bars (3) on the supporting transverse part (21) according to the positions of the formwork supporting frames of the formwork, inserting the lower ends of the steel pipes for erecting the formwork into the limiting steel bars (3), and erecting the formwork on the concrete beam at the positions of the limiting steel bars (3).
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| CN202110856563.0A CN113668850B (en) | 2021-07-28 | 2021-07-28 | Steel beam holding supporting system of formwork support frame and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110856563.0A CN113668850B (en) | 2021-07-28 | 2021-07-28 | Steel beam holding supporting system of formwork support frame and construction method thereof |
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| CN113668850A true CN113668850A (en) | 2021-11-19 |
| CN113668850B CN113668850B (en) | 2022-10-28 |
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| CN102418416A (en) * | 2010-09-28 | 2012-04-18 | 杨峰 | Long-slab-span steel beam cast-in-situ floor formwork system |
| CN208502236U (en) * | 2018-06-15 | 2019-02-15 | 桐乡中卓金属构件有限公司 | A kind of edge banding apparatus for concrete floor edge in steel construction |
| CN209686860U (en) * | 2019-01-30 | 2019-11-26 | 河南天丰钢结构建设有限公司 | A kind of floor of steel structure construction top support type exempts from support for shuttering |
| CN110700573A (en) * | 2019-10-11 | 2020-01-17 | 重庆建工建筑产业技术研究院有限公司 | Construction method, device and application of formwork support system adopting steel beam |
| CN213087425U (en) * | 2020-07-17 | 2021-04-30 | 中冶城市投资控股有限公司 | Template reinforcing apparatus and shaped steel concrete beam column template |
-
2021
- 2021-07-28 CN CN202110856563.0A patent/CN113668850B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102418416A (en) * | 2010-09-28 | 2012-04-18 | 杨峰 | Long-slab-span steel beam cast-in-situ floor formwork system |
| CN208502236U (en) * | 2018-06-15 | 2019-02-15 | 桐乡中卓金属构件有限公司 | A kind of edge banding apparatus for concrete floor edge in steel construction |
| CN209686860U (en) * | 2019-01-30 | 2019-11-26 | 河南天丰钢结构建设有限公司 | A kind of floor of steel structure construction top support type exempts from support for shuttering |
| CN110700573A (en) * | 2019-10-11 | 2020-01-17 | 重庆建工建筑产业技术研究院有限公司 | Construction method, device and application of formwork support system adopting steel beam |
| CN213087425U (en) * | 2020-07-17 | 2021-04-30 | 中冶城市投资控股有限公司 | Template reinforcing apparatus and shaped steel concrete beam column template |
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