JPH04309651A - Construction method for stairs - Google Patents

Abstract

PURPOSE:To provide so that the stairs do not become the neck in the process progress of an RC structure by removing the complicated frame work construction for stair floor parts and that the staircase can be made use of as a passage for work from before concrete laying when the stairs are built in an RC- structure building. CONSTITUTION:A supporting device is arranged in the condition without hindrance in passage on a landing 1, and a temporary landing B is installed on this supporting device A, and besides S-structure stairs are laid between the supporting devices A and A installed on the upper and lower landings 1,1. In this condition, the staircase is made use of as a passage for work and a framework D is laid on the temporary landing B, and the arrangement of bars and the concrete placing are performed to buid a landing 1 of RC structure.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for constructing stairs in an RC (reinforced concrete) building, and more specifically, the landing is made of RC construction using cast-in-place concrete;
This invention relates to a method of constructing a staircase with an S-shaped step floor.

0002

[Prior art] Conventionally, R by pouring concrete on-site
The stairwell in the C building had all four walls, landings, and steps made of reinforced concrete.

[0003] An RC staircase consisting of a landing and a stair floor is constructed using a large number of pipe supports as shoring, and these pipe supports support the steel pipe trusses and joists. Construction was carried out by installing concrete formwork and berm formwork, and then placing reinforcement and concrete on top of them, which had the following drawbacks.

[0004] In a narrow space, complicated form work, reinforcing work, and shoring work had to be carried out to match the slope of the berm, and this was a bottleneck in the progress of the project. ■Because there are a lot of pipe supports as shoring on the stepped floor,
Passage for workers was difficult, and the staircase could not be used as a work passage until the concrete had hardened and the formwork and shoring had been removed.

[0005]

SUMMARY OF THE INVENTION The present invention has been made with the above-mentioned points in mind, and its purpose is to eliminate the complicated formwork work for the stepped floor part and to improve the construction of stairs. In addition to ensuring that this does not become a bottleneck in the progress of the RC building construction process, the stairwell can be used as a work passageway (a passageway wide enough to transport materials, etc.) even before concrete is poured. It's about doing.

[0006]

[Means for Solving the Problems] In order to achieve the above object, in the first invention, a supporting device is installed on the landing in a position that does not hinder traffic, and a temporary landing is installed on the supporting device. In addition, there is an S between the supporting devices installed on the upper and lower landings.
After constructing the artificial staircase, reinforcing and pouring concrete were carried out on the landing formwork laid on top of the temporary landing to construct a staircase in which the landing was made of RC construction and the step floor was made of S construction. ing.

[0007] In a second aspect of the present invention, the supporting device comprises a pillar part erected on the landing and a supporting metal part attached to the upper end of the pillar part, and the supporting metal part is a height-adjustable part for supporting the temporary landing. 1 support part and the 2nd part for supporting the S-shaped stairs.
As the work progresses, the height of the temporary landing is changed from approximately the same level as the top of the landing to be constructed to approximately the same level as the bottom of the landing. It is characterized by

[0008] The support portion may be constructed by assembling a pipe support or a single pipe, but for the reasons described below,
It is preferable to use frame scaffolding frames.

[0009]

[Operation] According to the above configuration, a temporary landing is installed on the supporting device installed in a position that does not hinder traffic,
Since the S-frame stairs are constructed between the supporting devices installed on the upper and lower landings, there are no pipe supports standing on the step floor, and it is possible to pass from the lower landing to the S-frame stairs and temporary landing. , the staircase can be used as a work passage even before concrete is poured.

In particular, according to the configuration of the second invention, when the staircase before concrete pouring is used as a work passage, the height of the temporary landing is set to be approximately the same as the top surface of the landing to be constructed. Since it can be set at the same level, there is no unnatural step difference when walking from the S-frame stairs to the temporary landing, or from the temporary landing to the S-frame stairs, improving safety when used as a work passage. .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a folded staircase in an RC building made of cast-in-place concrete. This staircase consists of a landing (in the example shown, a landing on each floor and an intermediate landing).
1 is made of RC construction, and tiered floor 2 is made of S construction, and was constructed using the following method.

That is, as shown in FIGS. 2 to 4, a support device A consisting of a support section 3 and support hardware 4A, 4B attached to the upper end of the support device A is mounted on the landing 1 constructed in advance. Install it in an arrangement that does not cause any problems.

The support section 3 may be constructed of a pipe support or a single tube, but in this embodiment, in order to facilitate assembly and disassembly, as shown in the figure, The support portion 3 is constructed by using vertical frames for a framework scaffold, arranging the vertical frames in a substantially U-shape in plan view, and connecting adjacent vertical frames with orthogonal clamps or parallel clamps. are doing. Said temporary landing B
is a single panel having approximately the same area as the landing 1, and in this embodiment, the temporary landing B is constituted by an aluminum grating.

Next, a temporary landing B is placed on the supporting device A.
, and an S-shaped staircase C is constructed between the supporting devices A and A installed on the upper and lower landings 1 and 1.

In this state, it is possible to pass from the lower landing 1 to the S-frame stairs S and the temporary landing B,
The staircase will be used as a work passage even before concrete is poured.

[0016] Thereafter, a landing form D made of plywood is laid on the temporary landing B, reinforcement is placed on top of the landing form D, and concrete E is poured to construct the RC landing 1. The goal is to build.

By the way, suppose that the temporary landing B is fixedly installed at approximately the same level as the lower surface of the landing 1 to be constructed (that is, at a position lower than the lower surface of the landing by the thickness of the formwork). , When the staircase room was used as a work passage before concrete pouring, the temporary landing B was located lower than the top of the permanent landing, so the steps as a staircase were irregular at the position of the temporary landing B. Become.

Therefore, unless the steps are made regular by, for example, laying a temporary platform with an appropriate thickness on the temporary landing B, there will be a problem in ensuring safety when walking. , Regarding this point as well, the following measures have been taken.

That is, of the supporting hardware 4A, 4B, S
As shown in FIG. 5, the supporting hardware 4A on the side that supports the built staircase C has a sheath pipe 6 on the base plate 5 that fits into the upper end portion 3a of the column portion 3 (the upper end portion of the vertical rod of the vertical frame). A first support part 7 that is erected and whose height is adjustable for supporting the temporary landing B
a and a second support part 7b for supporting the S-shaped stairs C are connected by a horizontal square steel pipe 9, and a second support part 7b is connected to the middle part of the square steel pipe 9. The second support portions 7b, 7b are provided. The first support portion 7a is equipped with a screw type jack mechanism, and is provided with an upwardly U-shaped claw portion that engages with a grating of a grating used as a temporary landing B at its upper end. Further, the second support portion 7b is formed in the shape of a groove that opens upward and is parallel to the width direction of the stairs.

[0020] The other supporting hardware 4B is similar to the supporting hardware 4A.
The structure is such that the square steel pipe 9 and the second support part 7b are removed from the original structure, and a sheath pipe that fits into the upper end 3a of the support column 3 is erected on the base plate 5, and also for supporting the temporary landing B. A first support portion 7a whose height is adjustable is provided.

As shown in FIGS. 6 to 8, steel plates 10,
10, the second support parts 7b, 7 of the support hardware 4A, 4A
b, and in a state where the jack mechanism of the first support part 7a is extended, the temporary landing B is supported by the first support part 7a.

In this state, the temporary landing B is located at approximately the same level as the top surface of the landing to be constructed, and the steps of the stairs do not become irregular at the position of the temporary landing B. Also,
The grating for the temporary landing B engages with the claw portion of the first support portion 7a to prevent displacement in the horizontal direction.

[0023] Therefore, when using the staircase as a work passage before concrete pouring, walking can be done safely.

When pouring concrete for the landing, as shown in FIG. 9, the jack mechanism is scaled down to lower the position of the first support part 7a, and a temporary landing B is formed approximately on the lower surface of the landing to be constructed. the same level (in this example,
The landing formwork D is made of plywood, and after concrete hardens,
Because it will be removed, the formwork D is lower than the bottom of the landing that will be constructed.
It is at a lower position by the thickness of . ).

In this state, the form D is laid on the temporary landing B, reinforcement is arranged on the form D, and the anchor bolts 11 are attached to the plate 10.

Thereafter, concrete E is placed on the formwork D, and the landing 1 is constructed as shown in FIG.

Note that the formwork D may be laid before lowering the level of the temporary landing B. Further, in the illustrated embodiment, the anchor bolt 11 is inserted into the plate 10 and is secured with a nut 12. The anchor bolt 11 may be screwed into this and fixed.

The S-shaped staircase C may be made of a thick steel plate or a thin steel plate. Further, as the S-shaped stairs C, those manufactured in advance in a factory may be used, but in this embodiment, they are of a knock-down type.

Specifically, the hollow stringers 13 made of thin steel plates and the step bed components 2a and 2b made of thin steel plates are manufactured in a factory.
and the plate 10 are carried into the premises of a construction site, and at the site, the plurality of tiered floor components 2a and 2b are connected with each other with screws etc. to form the tiered floor 2, and the tiered floor 2 is constructed. It is constructed by connecting both ends to the stringers 13 on both sides with screws or the like, and further connecting the plate 10 to the stringers 13 with screws or the like. In addition, in the illustrated embodiment, the plate 10 is attached to the nut 1 so that the S-frame staircase C can be connected to the anchor bolt 11 even after concrete is poured.
2, the uppermost tiered floor component 2a is connected to the next tiered tiered floor component 2a and stringers 13 with screws or the like.

In FIG. 1, reference numeral 14 indicates an RC wall that supports the landing 1, reference numeral 15 indicates a handrail post fixed to the stringer 13 with screws, etc., and reference numeral 16 indicates a handrail. The walls located on both sides of the staircase in the width direction are fireproof walls constructed using dry construction methods (for example, fireproof walls using ALC boards, or fireproof walls constructed with a light iron base and affixed with calcium silicate boards). However, it may also be an RC wall made of cast-in-place concrete.

FIGS. 11 and 12 show another embodiment of the invention. In this embodiment, a plate 10 having a length spanning the entire width of the landing 1 is provided only on the lower end side (or upper end side) of each S-shaped staircase C.
On the other hand, on the upper end side (or lower end side), a channel material 10 with a downward opening extending between the left and right stringers 13 is provided.
a, and as shown in FIG. 12, another S-shaped staircase C
A feature is that the channel material 10a is fitted and supported. Note that the channel material 10a is fixed to the plate 10 by means such as welding while being fitted into the plate 10. The other configurations are the same as in the previous embodiment.

[0032]

[Effects of the Invention] As described above, according to the present invention, it is possible to eliminate the complicated formwork work for the stepped floor portion, and to prevent the stairs from becoming a bottleneck in the progress of the construction of an RC building.
Moreover, the staircase can be used as a work passage even before concrete is poured. According to claim 2,
In addition to the above effects, there are no unnatural steps when walking from the S-frame stairs to the temporary landing, and from the temporary landing to the S-frame stairs, improving safety when used as a work passage. effective.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of a staircase in which the landing is made of RC construction and the step floor is made of S construction.

FIG. 2 is a perspective view showing a method of constructing stairs.

FIG. 3 is a longitudinal side view showing a method of constructing stairs.

FIG. 4 is a plan view showing a method of constructing stairs.

FIG. 5 is a perspective view showing an example of a supporting hardware used in the above construction method.

FIG. 6 is a longitudinal cross-sectional side view of the main part showing the lower end side of the S-shaped staircase attached to the supporting hardware.

FIG. 7 is a vertical sectional side view of the main part showing the upper end side of the S-shaped staircase attached to the supporting hardware.

FIG. 8 is a longitudinal cross-sectional side view of the main part showing the state in which the temporary landing is attached to the supporting hardware.

FIG. 9 is a longitudinal sectional side view of the main part showing a state in which the temporary landing has been lowered and the landing formwork has been laid on the temporary landing.

FIG. 10 is a longitudinal cross-sectional side view of the main part showing a state in which the concrete of the landing has hardened.

FIG. 11 is a schematic plan view of main parts for explaining another embodiment of the present invention.

12 is a longitudinal sectional side view of the main part showing the lower end side of the S-shaped staircase shown in FIG. 11 attached to a supporting metal fitting.

[Explanation of symbols]

A. Shoring device B Temporary landing C S-built stairs

Claims (3)

[Claims] Claim 1: A supporting device is installed on the landing in a position that does not hinder traffic, a temporary landing is installed on top of the supporting device, and an S-shaped staircase is constructed between the supporting devices installed on the upper and lower landings. Then, after that, reinforcing and pouring concrete are performed on the landing formwork laid on the temporary landing to construct a staircase in which the landing is made of RC construction and the step floor is made of S construction. How to construct stairs. 2. The support device comprises a support section that stands upright on the landing and a support hardware attached to the upper end of the support, and the support hardware is a height-adjustable first support part for supporting the temporary landing. and a second support part for supporting the S-shaped staircase, and as the work progresses, the height of the temporary landing can be adjusted from approximately the same level as the top of the landing to be constructed to the bottom of the landing to be constructed. 2. The method of constructing stairs according to claim 1, wherein the steps are changed to substantially the same level. 3. The method for constructing stairs according to claim 1, wherein a vertical frame for a scaffolding is used as the support portion.