CN111962784A - Prefabricated staircase connection method for improving stability of outer shear wall of staircase - Google Patents
Prefabricated staircase connection method for improving stability of outer shear wall of staircase Download PDFInfo
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- CN111962784A CN111962784A CN202011029583.2A CN202011029583A CN111962784A CN 111962784 A CN111962784 A CN 111962784A CN 202011029583 A CN202011029583 A CN 202011029583A CN 111962784 A CN111962784 A CN 111962784A
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- staircase
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- prefabricated staircase
- prefabricated
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000009434 installation Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 239000004570 mortar (masonry) Substances 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims 1
- 210000003205 muscle Anatomy 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 238000010008 shearing Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 238000009417 prefabrication Methods 0.000 abstract description 2
- 239000011150 reinforced concrete Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 238000009415 formwork Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
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- 239000004566 building material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Steps, Ramps, And Handrails (AREA)
Abstract
The invention discloses a prefabricated staircase connecting method for improving the stability of a staircase shear outer wall, and relates to the field of building structures. The invention improves the stability of the shear outer wall of the staircase, enlarges the application range of the prefabricated staircase, greatly reduces the project amount of cast-in-place staircases, lowers the prefabrication and installation cost, accelerates the production and installation progress, improves the installation effect of the staircase, and has the social benefit and the economic value of rapid construction, energy conservation and material conservation.
Description
Technical Field
The invention relates to the technical field of building structures, in particular to a prefabricated staircase connecting method for an assembly type reinforced concrete high-rise residential building, which is particularly suitable for a staircase with a shear outer wall in the high-rise residential building and can improve the stability of the shear outer wall of the staircase.
Background
The standardization degree of the multi-stairs of the high-rise dwelling house is high, and the prefabricated stairs with hinged upper ends and fixed lower ends in sliding connection can obviously reduce the workload of on-site formwork erecting and formwork removing, improve the on-site engineering quality, improve the on-site civilized construction level and accelerate the construction progress. But at present, elevator shafts and fire staircases are often arranged in a core barrel of many high-rise buildings, as the core barrel is provided with holes and has more floor rigidity weakened too much, weak connection exists, a shear outer wall is generally arranged at the periphery of the core barrel (including an outer wall of the staircase) in order to ensure the integral rigidity, and a barrel body is formed as much as possible to improve the integral rigidity of the core barrel. Therefore, the conventional prefabricated staircase with the hinged upper end and the fixed sliding lower end cannot be adopted, and the slidable prefabricated staircase can cause the outer shear wall of the staircase to lose the outer surface support, so that the outer surface stability of the outer shear wall of the staircase is weakened, the structural safety of the shear wall of the main body is influenced, and the prefabricated staircase for many similar projects is abandoned to adopt the integral cast-in-place staircase. Cast-in-place stairs are inclined bent components and stair step dogteeth are staggered, stair field formwork erection in a narrow stair space between stairs is very troublesome, cast-in-place concrete is very difficult, bleeding and maintenance water generated by casting of vibrated concrete often cause cross flow of sewage between stairs, so that the construction phenomenon of dirty and messy conditions generally exists on the site, civilized construction cannot be realized, and a great deal of inconvenience is undoubtedly brought to field construction by the cast-in-place stairs.
The shear wall structure is mainly adopted in high-rise houses, the overall lateral stiffness of the houses is high, generally, cast-in-place integral stairs have little influence on the overall stiffness, the earthquake action absorbed by the stairs is very limited, and the stairs cannot be damaged at all under the earthquake action, which is proved by cast-in-place integral shear wall structures integrally cast by most of the stairs, and this shows that even if the integral casting does not release the rigidity of the stairs, the whole main body structure is not adversely affected, in this way, the upper end hinged and fixed lower end sliding connection of the conventional prefabricated stairs can be optimized to change the connection mode into cast-in-place.
In conclusion, the conventional prefabricated staircase influences the stability of the shear outer wall of the staircase, and a feasible prefabricated staircase connection method is needed to improve the stability of the shear outer wall of the staircase, so that the characteristics of building industrialization are fully exerted, and the prefabricated staircase is applied to the staircase with the shear outer wall.
Disclosure of Invention
The reinforced concrete prefabricated staircase connection method optimizes the connection mode of the end parts of the conventional prefabricated staircase, breaks through the defect that the conventional prefabricated staircase cannot be applied to the staircase with the shear outer wall, expands the application range of the prefabricated staircase, greatly reduces the project amount of cast-in-place staircases, saves building materials, reduces the prefabrication and installation cost, accelerates the production and installation progress and improves the installation efficiency of the staircase.
The technical scheme adopted by the invention for solving the technical problems is as follows: the existing conventional connection mode that the upper end of the prefabricated part is hinged and the lower end of the prefabricated part slides is changed into the mode that the prefabricated part is directly placed on an overhanging cantilever thin plate of a cast-in-place floor ladder beam, and then concrete is poured. The vertical face of the board side of prefabricated staircase is equipped with the level according to certain interval along parallel halfpace length direction and to the preformed hole, is equipped with the connecting bolt of tip area spring in the preformed hole, and this bolt is connected prefabricated staircase and staircase shear force outer wall into whole to the off-plate that makes prefabricated staircase can regard as this shear force outer wall supports, has guaranteed the off-plate stability of shear force outer wall.
The reinforced concrete prefabricated staircase connecting method has the direct effects that: the prefabricated staircase overcomes the defect of the connection mode that the upper end is hinged and the lower end slides when the conventional prefabricated staircase is widely used, and is directly cast in place with a floor structure, so that the application range of the prefabricated staircase in the high-rise building of the type is expanded, the on-site construction is greatly facilitated, the engineering cost is remarkably reduced, the rapid construction, energy conservation and material conservation social benefits and economic values are realized, and the development of the modern fabricated reinforced concrete building is greatly promoted.
Drawings
The detailed structure of the invention is described in detail below with reference to the accompanying drawings
Fig. 1 is a sectional view of the prefabricated staircase according to the present invention.
Fig. 2 is a sectional view of the connection of the lower end of the prefabricated staircase according to the present invention.
FIG. 3 is a cross-sectional view taken along line A-A of the present invention.
The method comprises the following steps of 1-prefabricated staircase, 2-prefabricated staircase closed U-shaped reinforcing steel bars, 3-post-pouring concrete, 4-floor cast-in-place staircase beams, 5-floor cast-in-place staircase beams, 6-cast-in-place cantilever slabs, 7-prefabricated staircase side faces are horizontally reserved with holes, 8-reserved vertical holes, 9-staircase shear outer walls, 10-on-site pouring of high-strength shrinkage-free mortar, 11-detachable temporary steel frames, 12-springs, 13-nuts, 14-embedded steel backing plates, 15-embedded connecting bolts, 16-embedded threaded sleeves, 17-plate side vertical faces of the prefabricated staircase, 18-staircase step horizontal faces, 19-gaps between the prefabricated staircase and the outer shear walls are filled with the high-strength mortar, and 20-filling gaps with PE (polyethylene) bars for caulking.
Detailed Description
The most key concept of the invention is as follows: the prefabricated staircase is directly placed on the cantilever slab extending outwards of the cast-in-place staircase beam and is poured integrally with the floor structure, the prefabricated staircase side plate is provided with a reserved hole, a connecting bolt is arranged in the hole, a threaded sleeve is pre-embedded in the shear outer wall of the staircase, and the prefabricated staircase and the threaded sleeve form a whole through the connecting bolt, so that the prefabricated staircase can serve as an outer surface support of the shear outer wall, and the stability of the shear outer wall of the staircase is improved.
In order to explain technical contents, structural features, objects, and effects of the present invention in detail, the present invention will be described in detail with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the system comprises a prefabricated staircase 7, a floor cast-in-place stair beam 5, a cast-in-place overhanging cantilever plate 6 and a detachable temporary steel frame 11.
Further, the method comprises the following steps: the prefabricated staircase 7 rests on the upper surface of a cast-in-place overhanging cantilevered slab 6 projecting from a floor cast-in-place ladder beam 5.
Further, the method comprises the following steps: the upper end of the prefabricated staircase 7 extends out of the closed U-shaped steel bar 2.
Further, the method comprises the following steps: the cast-in-place floor ladder beam 5 is provided with reserved overhanging U-shaped reinforcing steel bars 4, overhanging cantilever plates 6 and detachable temporary steel frames 11, and the temporary steel frames 11 are used for supporting the overhanging cantilever plates 6 so as to bear the weight transmitted by the prefabricated staircase 7.
Further, the method comprises the following steps: the closed U-shaped reinforcing steel bars 2 and the overhanging U-shaped reinforcing steel bars 4 are mutually overlapped, staggered, bound and overlapped, and then post-cast concrete 3 is poured to form a whole.
Further, the method comprises the following steps: the vertical face 17 on the side of the prefabricated staircase 7 is provided with the horizontal preformed holes 7 at equal intervals along the length direction parallel to the staircase boards, and the horizontal face 18 adjacent to the staircase step is provided with the vertical preformed holes 8 vertical to the horizontal preformed holes 7, please refer to fig. 3.
Further, the method comprises the following steps: the horizontal preformed hole 7 and the vertical preformed hole 8 are vertically communicated, and an embedded connecting bolt 16 with a spring 12 at the end part is arranged in the horizontal preformed hole 7, please refer to fig. 3.
Referring to fig. 2, the system comprises a prefabricated staircase 7, a floor cast-in-place stair beam 5, a cast-in-place overhanging cantilever plate 6 and a detachable temporary steel frame 11.
The prefabricated staircase 7 is mainly used for illustrating the connection mode of the lower end of the prefabricated staircase and is completely the same as the connection mode of the upper end of the prefabricated staircase 7 shown in figure 1.
Referring to fig. 3, the cross-sectional view a-a mainly illustrates the connection relationship and details between the vertical plate-side surface 17 and the outer shear wall 9 of the prefabricated staircase, including the vertical plate-side surface 17, the outer shear wall 9, the horizontal preformed hole 7, the preformed vertical hole 8, the high-strength non-shrinkage mortar 10, the spring 12, the nut 13, the embedded steel backing plate 14, the embedded threaded sleeve 15, and the embedded connecting bolt 16.
Further, the method comprises the following steps: and a spring 12, a nut 13, an embedded steel backing plate 14 and an embedded connecting bolt 16 are arranged in the horizontal preformed hole 7.
Further, the method comprises the following steps: the depth of the horizontal preformed hole 7 is larger than the length of the embedded connecting bolt 16, so that the bolt 16 can be completely hidden in the horizontal preformed hole before installation and cannot extend out of the vertical surface 17 on the plate side, and the installation of the staircase is facilitated.
Further, the method comprises the following steps: after the stair is installed in place, the springs 12 are released, the embedded connecting bolts 16 can be ejected out and inserted into the corresponding embedded threaded sleeves 15 of the shear outer wall 9, and then the bolts 16 are screwed and fixed by using a spanner.
Further, the method comprises the following steps: the nut 13 is used for connecting and fixing the embedded connecting bolt 16 at the embedded steel backing plate 14.
Further, the method comprises the following steps: the steel shim plate 14 is firmly fixed inside the vertical face 17 of the prefabricated staircase slab for transmitting and releasing the axial forces to which the connecting bolts 16 are subjected, the face being provided with holes of larger diameter than the bolts 16 for the threaded insertion.
Further, the method comprises the following steps: the diameter of the reserved vertical hole 8 is not less than 50mm so as to install the nut 13.
Further, the method comprises the following steps: the inner surface of the shear outer wall 9 is provided with embedded thread sleeves 15 which correspond to the positions of the horizontal preformed holes 7 one by one, and the internal thread distance of the embedded thread sleeves is completely the same as that of the embedded connecting bolts 16.
Further, the method comprises the following steps: the gap between the shear outer wall 9 and the vertical plate side surface 17 of the prefabricated staircase is used for adjusting construction installation errors of the prefabricated staircase 7, the PE rod hole 20 for caulking is plugged into the bottom of the rear joint after the shear outer wall 9 and the prefabricated staircase are accurately positioned and firmly connected, and then high-strength mortar 19 is filled in to connect the shear outer wall 9 and the prefabricated staircase into a whole, so that the prefabricated staircase 7 can be effectively used as an out-of-plane support of the shear outer wall 9, and the out-of-plane stability of the shear outer wall 9.
Further, the method comprises the following steps: and after the pre-buried connecting bolts 16 are firmly connected, pouring high-strength shrinkage-free mortar 10 into the reserved vertical holes 8 and the reserved horizontal holes 7, and vibrating the mortar for compaction.
The first … … and the second … … are only used for name differentiation and do not represent how different the importance and position of the two are.
Here, the upper, lower, left, right, front, and rear represent only relative positions thereof and do not represent absolute positions thereof.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A prefabricated staircase connection method for improving the stability of a shear outer wall of a staircase is characterized in that: the connecting method is particularly suitable for high-rise buildings and houses with shear walls arranged on the outer walls of staircases.
2. A prefabricated staircase connection method for improving the stability of a shear outer wall of a staircase is characterized in that: the upper end and the lower end of the prefabricated staircase are provided with reserved closed U-shaped steel bars which extend out.
3. A prefabricated staircase connection method for improving the stability of a shear outer wall of a staircase is characterized in that: the cast-in-place floor ladder beam connected with the upper end and the lower end of the prefabricated staircase is provided with an overhanging cantilever thin plate and a closed U-shaped reinforcing steel bar, and a temporary steel frame which can be detached in the later period is arranged at the bottom of the cantilever thin plate.
4. A prefabricated staircase connection method for improving the stability of a shear outer wall of a staircase is characterized in that: the prefabricated staircase tip is placed on the cantilever sheet metal that stretches outward, and the tip is reserved reinforcing bar and is overlapped crisscross ligature overlap joint with the overhanging muscle of cast-in-place floor ladder beam each other, then pours post-cast concrete and forms the whole with the two.
5. A prefabricated staircase connection method for improving the stability of a shear outer wall of a staircase is characterized in that: the vertical face of the board side of prefabricated staircase is equipped with equidistant level along parallel riser length direction to the preformed hole, is equipped with the connecting bolt of tip area spring in the preformed hole.
6. A prefabricated staircase connection method for improving the stability of a shear outer wall of a staircase is characterized in that: a vertical hole perpendicular to the hole is formed in the position, 50mm away from the hole, of the horizontal plane of the stair step, and the two holes are vertically communicated.
7. A prefabricated staircase connection method for improving the stability of a shear outer wall of a staircase is characterized in that: the staircase shear outer wall is provided with pre-embedded thread sleeves with threads which are in one-to-one correspondence with the positions of the preformed holes on the horizontal direction of the side of the prefabricated staircase.
8. A prefabricated staircase connection method for improving the stability of a shear outer wall of a staircase is characterized in that: connecting bolts of the horizontal preformed holes on the side of the stair installation front plate are clamped at the inner end parts of the holes without extending out of the side faces through springs so as to install the stairs, after the stairs are installed in place, the springs are released so that the connecting bolts extend out and are inserted into embedded screw sleeves corresponding to the outer walls of the shearing force one by one, and then the bolts are screwed by using a spanner.
9. A prefabricated staircase connection method for improving the stability of a shear outer wall of a staircase is characterized in that: after the end part of the horizontal hole is blocked and sealed, high-strength shrinkage-free mortar is poured into the vertical hole, and after the mortar is solidified, the two holes are sealed and connected into a whole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011029583.2A CN111962784A (en) | 2020-09-27 | 2020-09-27 | Prefabricated staircase connection method for improving stability of outer shear wall of staircase |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011029583.2A CN111962784A (en) | 2020-09-27 | 2020-09-27 | Prefabricated staircase connection method for improving stability of outer shear wall of staircase |
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| CN111962784A true CN111962784A (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011029583.2A Pending CN111962784A (en) | 2020-09-27 | 2020-09-27 | Prefabricated staircase connection method for improving stability of outer shear wall of staircase |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404235A (en) * | 2021-06-17 | 2021-09-17 | 广东翔顺建筑工程有限公司 | Simply-supported two-span continuous prefabricated assembled scissors stair of segmentation earlier |
| CN113718954A (en) * | 2021-09-07 | 2021-11-30 | 浙江大东吴建筑科技有限公司 | Beam-column joint of steel and concrete combined structure and mounting method |
-
2020
- 2020-09-27 CN CN202011029583.2A patent/CN111962784A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404235A (en) * | 2021-06-17 | 2021-09-17 | 广东翔顺建筑工程有限公司 | Simply-supported two-span continuous prefabricated assembled scissors stair of segmentation earlier |
| CN113718954A (en) * | 2021-09-07 | 2021-11-30 | 浙江大东吴建筑科技有限公司 | Beam-column joint of steel and concrete combined structure and mounting method |
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Application publication date: 20201120 |
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| WD01 | Invention patent application deemed withdrawn after publication |