JPH04371649A - Method for erecting staircase of structural steel - Google Patents

Abstract

PURPOSE:To provide a method wherein a staircase of structural steel can be erected easily and safely and utilized as a construction passage when reinforcing bars of floor slab and concrete are placed. CONSTITUTION:Prior to the construction of forms of floor slab, a lower side landing 6a of the second structural steel staircase 6 is connected to an upper side landing 6a of the first structural steel staircase 2 which is connected to a floor slab 1a of a lower floor having been constructed to form an intermediate landing A1. An upper landing 6b of the second staircase 6 and a lower landing of the third staircase 8 connected to the upper landing are supported by a temporary supporting body 7 erected on a lower floor landing F1 connected to the floor slab 1a. Thereafter, the construction of forms of a floor slab connected to an upper floor landing F2 constituted from the landing 6b of the second staircase 6 and the lower landing of the third staircase is performed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for constructing steel-framed stairs, and more specifically, to a building in which a floor slab is constructed by pouring concrete on-site, the present invention relates to a method of constructing a steel-frame staircase with a half-story height, which has landings on both the upper and lower sides of a stepped floor. The present invention relates to a method of constructing a folding steel staircase with an intermediate landing formed by a steel staircase.

0002

BACKGROUND OF THE INVENTION When constructing a folding steel staircase with an intermediate landing in a reinforced concrete building with a floor slab cast on site, the following construction procedure has conventionally been adopted.

[0003] That is, a formwork for a floor slab is constructed in advance to form an opening for stairs, and concrete is poured. After the upper floor slab is constructed, the lower floor slab is assembled to the lower floor slab. A half-story steel staircase is suspended by a crane and inserted through the stair opening in the upper floor slab, and the lower landing part of the lower steel staircase is assembled to the lower floor slab using anchor bolts.

[0004] Thereafter, the upper half-story steel staircase to be assembled to the upper floor slab is suspended by a crane and inserted through the stairway opening, and the lower landing portion of the upper steel staircase is attached to the lower steel frame. In addition to connecting the upper landing of the staircase to form an intermediate landing, the upper landing of the upper steel staircase was assembled to the upper floor slab using anchor bolts, and these steps were repeated in order to build the steel staircase.

[0005] However, when using the above construction method, if external scaffolding is not provided around the building, once the formwork work for the floor slab is completed, there will be a work path for climbing up and down the formwork. External scaffolding was considered essential. Moreover, in this case, the workers had to climb up and down the formwork through a narrow working path provided on the external scaffolding, which was inconvenient for transporting materials.

Furthermore, in the above method, the steel staircase, which is composed of a step floor section and landing sections provided above and below it, must be inserted through a narrow staircase opening formed in the upper floor slab. It has the disadvantage that it is difficult to insert and requires time and effort, and there is also a risk that the steel staircase will collide with the surroundings of the opening during insertion, causing damage to the steel staircase and the structure.

[0007] In addition, in an RC building, by making only the stairway of the S structure, it is possible to erect steel-frame stairs prior to floor slab form work and use the steel-frame stairs as a work passage. However, in this case, even though the building is made of RC with the intention of reducing costs, the amount of steel used will increase, resulting in high construction costs.

[0008]

[Problems to be Solved by the Invention] The present invention has been made with the above-mentioned points in mind, and its purpose is to enable steel-frame stairs to be built easily and safely, and to
To provide a method for constructing steel-frame stairs that can shorten the construction period and reduce construction costs by allowing the steel-frame stairs to be used as a work passage during floor slab reinforcement, concrete pouring, etc.

[0009]

[Means for Solving the Problems] The technical means taken by the present invention to solve the above problems are as follows. That is, in the method for constructing a steel-frame staircase according to the present invention, a second steel-frame staircase is installed on the upper landing portion of a first steel-frame staircase that has been assembled to an already constructed floor slab on the lower floor, prior to the floor slab formwork work. The lower landing portions of the stairs are connected to form an intermediate landing, and the upper landing portion of the second steel stairway and the lower landing portion of the third steel stairway connected to the upper landing portion are connected to the lower landing portion of the second steel stairway that connects to the floor slab. The floor slab is supported by a temporary support installed on the floor landing, and then connected to the upper floor landing, which is composed of the upper landing part of the second steel staircase and the lower landing part of the third steel staircase. It is characterized by performing formwork work.

[0010] Regarding the intermediate landing, there are two cases in which it is supported by a steel column erected only on one side of the stairwell, that is, only on the side where the intermediate landing exists, and a case in which it is supported by a steel column that is erected only on the side where the intermediate landing exists, and there are two cases in which it is supported by a steel column erected only on the side where the intermediate landing exists. A temporary support is erected on the intermediate landing on the lower floor, and RC is carried out with this temporary support supporting the intermediate landing on the upper floor.
In some cases, concrete for the wall is poured and an intermediate landing is assembled to the RC wall.

[0011]

[Operation] According to the above configuration, on the top floor where concrete is to be poured, the second steel staircase is attached to the first steel staircase that has been assembled to the floor slab that has already been poured with concrete. The pre-assembled second steel staircase and the third steel staircase connected to it are supported by temporary supports, and then the floor slab formwork, reinforcement work, and concrete pouring are carried out. , the second pre-assembled
and a third steel staircase will be integrated with the floor slab.

0012

[Example] Figures 1 and 2 are explanatory diagrams of the construction procedure showing an example of the method of building a steel staircase according to the present invention, Figure 3 is an enlarged partially cutaway side view of the main part, and Figure 4 is the main part. FIG. First, an example of how to build a steel staircase will be explained using these figures.

As shown in FIG. 1(a), the top floor slab 1a of the already constructed RC floor slabs 1 has a stepped floor portion and landing portions provided on both upper and lower sides thereof. A first steel staircase 2 with a half-story height, consisting of It is assembled in the same condition. 1st steel staircase 2
The upper landing portion 2b is connected to and supported by a steel column 5 which is extended by adding two layers in sequence from below.

Above the side of the first steel staircase 2, there is a
As shown in (b), FIGS. 3 and 4, the second half-story steel staircase 6 with a similar configuration is moved by a crane or the like (not shown).
At the same time, the lower landing part 6a is connected to the steel column 5 with the lower landing part 6a located on the side of the upper landing part 2b of the first steel staircase 2, The lower landing part 6a of the second steel staircase 6
is connected to the upper landing part 2b of the first steel staircase 2 to form an intermediate landing A1.

In the figure, 24 is a steel beam installed between the steel columns 5, 5, and 25... is a steel beam attached to the steel beam 24.
It is an LC version and constitutes a fireproof wall that partitions the staircase B and the elevator shaft C. 26 are gusset plates welded to the steel columns 5 and the steel beams 24, and the steel stairs 2 and the steel stairs 6 are made of these gusset plates 2.
6 and the stringers 15 on both sides are connected with bolts and nuts 27.

On the other hand, as shown in FIG. 1(c), a temporary support 7 is erected on the lower landing F1 connected to the floor slab 1a on the top floor, and this temporary support 7 supports the second steel staircase 6. supports the upper landing portion 6b.

Furthermore, as shown in FIG. 2(a), an extension steel column 5a is added to the steel column 5, and a third steel staircase 8 having a similar configuration and having a half-story height is added thereto using a crane or the like. (not shown) and carry it in, and the lower landing part 8
a is supported by the temporary support 7, and the upper landing part 8b is connected to the extension steel column 5a, and the lower landing part 8a of the third steel staircase 8 and the upper landing of the second steel staircase 6 are connected. The upper floor landing F2 is constructed by connecting the portions 6b and 6b to each other.

Anchor bolts 9 are attached to these upper landing portions 6b and lower landing portions 8a, respectively, and a floor slab connected to the upper landing F2 (upper landing portion 6b and lower landing portion 8a) is attached. The floor slab 10 and the beam 30 are assembled as shown in FIG. 2(b). To construct. After the floor slab 10 is constructed, the temporary support 7 is removed and used for the upper floor.

Next, the constructed floor slab 10 is used as the top floor slab 1a, and the third steel stairway 8 is used as the first steel stairway 2, and the same procedure as described above is repeated, in order:
A steel staircase will be built upwards.

Next, the temporary support 7 used in the above-mentioned method of building a steel frame staircase will be explained. As shown in FIG. 3 and FIGS. 5 to 7, (however, in FIG. 4, the step floor portions of the second and third steel stairs 6 and 8 are omitted from the drawing for clarity. ) Temporary support 7
is constructed by connecting a temporary beam 12 to the upper part of a pair of temporary supports 11, 11 with a pin 13, and attaching a pair of turnbuckle type braces 14, 14 in an X-shape.
and landing portions 6a of each of the third steel stairs 6 and 8
, 8a on both sides of the stringers 15...
2 to be brought into contact with and supported.

Channel-shaped backing plates 17, 17 are provided on the temporary beam 12 via auxiliary supports 16, 16, and these backing plates 17, 17 are used to connect a plurality of It supports the downward end surfaces of the reinforcing ribs 18, 18. The channel-shaped backing plate 17 may be one in which the central horizontal plate portion is in contact with the downward end surfaces of the reinforcing ribs 18, 18, or the end surfaces of the rising plate portions on both sides are in contact with the downward end surfaces of the reinforcing ribs 18, 18. It can be anything.

Each of the temporary columns 11, 11 is constructed by connecting a lower column 19 and an upper column 20 so that their lengths can be adjusted using four adjustment bolts 21, as shown in FIG. . The lower part of the lower support 19 is a floor slab 1a.
It is mounted and supported on a plate 22 provided on the side. This plate 22 may be integrally connected to the lower support column 19. A bracket 23 is welded to protrude from one horizontal side of the upper part of the upper support column 20, and the temporary beam 12 is connected to this bracket 23 by the pin 13.

[0023] In the above embodiment, the fireproof wall that partitions the staircase B and the elevator shaft C is made of ALC plates, and is provided to support the steel beams 24 necessary for installing these ALC plates. It was configured to support the intermediate landing A1 using additional steel columns 5.
If the wall on the side where the intermediate landing A1 of the staircase room B exists is also an RC wall made of cast-in-place concrete, the intermediate landing A1 will be supported as follows.

That is, as shown in FIG. 8, a temporary support 7A having the same structure as the above-mentioned temporary support 7 is erected on the intermediate landing A0 of the lower floor constructed previously, and this temporary support 7A is
The lower landing portion 6a of the second steel staircase 6 and the upper landing portion 2 of the first steel staircase 2 connected thereto.
Support the intermediate landing A1 consisting of B and B, and in this state perform wall formwork work, reinforcing work, and concrete pouring to construct the RC wall D. The intermediate landing A1 is assembled via the anchor bolts 28.

[0025] The temporary support 7A will be removed when the concrete of the RC wall D has developed a predetermined strength, and will be used for the upper floor. The lower landing portion 8a of the third steel staircase 8 is replaced with the upper landing portion 6a of the second steel staircase 6.
If the necessary rigidity and strength cannot be obtained even by connecting to the intermediate landing A1, as shown in FIG. The upper landing portion 8b of the third steel staircase 8 may be supported by the temporary support body 7B.

[0026]

[Effects of the Invention] As described above, according to the present invention, in order to erect a steel-framed staircase prior to the formwork work for a floor slab, the steel-framed staircase is installed during reinforcing work on the formwork, concrete pouring, etc. It can be used as a working passageway, and external scaffolding around the building can be omitted, compared to the conventional case where steel stairs are inserted through narrow stair openings formed in the floor slab. Steel staircases can be easily and safely erected in a large work space, and there is no damage to the structure due to collisions with steel staircases, which is extremely effective in shortening construction time and reducing construction costs.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a construction procedure showing an embodiment of a method for building a steel staircase according to the present invention.

FIG. 2 is an explanatory diagram of the construction procedure following FIG. 1.

FIG. 3 is a partially cutaway enlarged side view of the main part.

FIG. 4 is a perspective view of main parts.

FIG. 5 is a front view of main parts.

FIG. 6 is a plan view of main parts.

FIG. 7 is a cross-sectional plan view of main parts.

FIG. 8 is a partially cutaway enlarged side view of a main part showing another embodiment of the present invention.

[Explanation of symbols]

1a...floor slab, 2...first steel staircase, 2a...lower landing part, 6...second steel staircase, 6a...lower landing part,
6b... Upper landing part, 7... Temporary support, 8... Third steel staircase, 8a... Lower landing part, F1... Lower floor landing,
F2...Upper landing, A1...Middle landing.

Claims (3)

[Claims] Claim 1: Prior to the floor slab formwork work, a lower landing portion of the second steel staircase 6 is attached to the upper landing portion 2b of the first steel staircase 2 assembled to the already constructed floor slab 1a of the lower floor. The sections 6a are connected to form an intermediate landing A1, and the upper landing section 6b of the second steel staircase 6 and the lower landing section 8a of the third steel staircase 8 connected to the upper landing section 6b are connected to the floor slab. The lower floor landing F1 connected to 1a is supported by an erected temporary support 7, and then the upper landing part 6b of the second steel staircase 6 and the lower landing part 8a of the third steel staircase 8 are constructed. A method for constructing a steel-framed staircase, which is characterized by performing formwork work for a floor slab connected to an upper floor landing F2. 2. The method of building a steel staircase according to claim 1, wherein the intermediate landing A1 is supported by a steel column 5 erected only on one side of the staircase chamber. 3. Concrete for the RC wall is poured while the intermediate landing A1 is supported by a temporary support 7A erected on the intermediate landing A0 on the lower floor, and the intermediate landing A1 is assembled to the RC wall. The method of building a steel staircase according to claim 1, characterized in that: