JP2901967B1 - Suspended stairs and their construction method - Google Patents

Abstract

[PROBLEMS] To reduce the weight of a suspension staircase, shorten the construction period, and reduce construction costs. SOLUTION: A girder 1 protruding from a rooftop floor of a building body.
, A plurality of inner and outer PC steel members 3, 3 ..., 4, 4 ... anchored in two rows at a predetermined interval, and lower floor PC steel members 3a, 3a ..., 4a, 4a ..., 3n , 3n ...,
4n, 4n... Are sequentially connected and suspended to the lowest floor, and the PC steel members 3, 3,..., 4, 4,.
a ..., 3n, 3n ..., 4n, 4n ... stairs 5,5 on each floor
a ..., 5n are supported and connected in order from the upper floor to the lower floor, and each P
C steel 3,3,4,4,3a, 3a, 4a, 4a
, 3n, 3n, 4n, 4n, etc., are configured to bear the step load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a serran-shaped suspension staircase constructed on a side wall of a steel frame, reinforced concrete, or steel reinforced concrete building body, and a construction method thereof.

[0002]

2. Description of the Related Art A conventional steel spiral staircase is constructed such that a foundation is constructed on the ground, and a stair of each floor is sequentially connected to a support made of a steel pipe or a square steel pipe having a lower end fixed to the foundation, and supported. Let me do it. Thereby, the stairs own weight and the loaded load are transmitted to the foundation as axial force by the above-mentioned support.

[0003]

However, according to the conventional steel spiral staircase described above, the foundation and the support are indispensable, and the weight of the staircase is large, so that a large-scale foundation work is required. Labor and a lot of time, the construction period is long, and the construction cost is high.

[0004] The present invention has been made in view of the above-mentioned problems of the prior art, and a plurality of PCs are constructed by abolishing the foundations and columns and anchoring the upper end to a girder extending outward from the rooftop floor. PC steel is connected to the steel from the upper floor in order from the upper floor and suspended to the first floor, the stairs of each floor are connected and supported, and the stairs' own weight and loading load are transmitted to the building body via PC steel and girder. Accordingly, an object of the present invention is to provide a suspended staircase and a construction method thereof capable of reducing the weight of the stairs, shortening the construction period, and reducing the construction cost.

[0005]

In order to achieve the above object, a suspension staircase according to the present invention is provided on a girder protruding from a rooftop floor of a building body, in which two beams are anchored in two rows at predetermined intervals. A plurality of PC steels on the outer side are sequentially connected with PC steels on the lower floor and suspended to the lowest floor, and the PC steels are connected to and support the stairs on each floor so that each PC steel bears the stair load. It is characterized by having been constituted.

In order to achieve the above object, a method for constructing a suspension staircase according to the present invention is characterized in that a plurality of PC steel members are provided at predetermined intervals on a girder projecting from a rooftop floor of a building body at a predetermined interval. After hanging the stairs mounting brackets at the bottom, tightening the mounting brackets with nuts to support the stairs on the top floor, After connecting the steel materials, after setting the lower metal fittings of the lower stairs to the lower part of the PC steel material, tighten the nuts and tighten the nuts to support the lower stairs. It is characterized in that the stairs are suspended and constructed in multiple stages to the lower stage.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a suspension staircase according to the present invention and a construction method thereof will be described below with reference to FIGS. 1 shows a vertical sectional view of the entire suspension staircase, FIG. 2 shows a plan view of the entire suspension staircase, FIG. 3 shows a partially enlarged plan view of a staircase on each floor in the suspension staircase, and FIG. -A
5 shows an enlarged sectional view taken along line BB in FIG. 4, FIG. 5 shows a sectional view taken along line BB in FIG. 4, FIG. 6 shows a sectional view of a girder to which a PC steel material is anchored in a staircase on the top floor, and FIG. FIG. 8 shows a front view of the part (a) in FIG. 6, and FIG.
FIG. 9 is a cross-sectional view of a state in which a stair is supported by a PC steel material, FIG. 10 is a plan view of a coupler, and FIG. 11 is a vertical cross-section of the coupler.

In FIGS. 1 and 4 to 6, reference numeral 1 denotes a girder. This girder 1 is the building body 2 shown in FIG.
It extends horizontally from the rooftop floor to the required length and is configured horizontally. The girder 1 may be made of a reinforced concrete structure shown in FIG. 6, a steel frame structure (not shown), or a steel reinforced concrete structure, but is constructed to have a rigid structure having sufficient strength to suspend stairs.

As shown in FIGS. 1 to 5, a plurality of PC steel members 3, 3,..., 4, 4,. . This P
As shown in FIG. 2, the C steel members 3, 3,..., 4, 4,.
The interval A is larger than the width a by a required dimension at 5 to 5n.
As shown in FIGS. 2 to 4, the same number (four in the illustrated example) is suspended in two rows on the inside and outside. The inner and outer PC steel materials 3, 3 ..., 4, 4 ...
As shown in FIGS. 1 and 2, the stairs 5, 5a... 5n are hung at a constant interval b in the length direction.

The upper end of each of the above-mentioned PC steel members 3,...
As shown in the above, an anchor bolt 7 is coaxially crimped and fixed by a condominium 6, is inserted into a stainless steel tube 8 buried vertically through the girder 1, and is inserted from the upper end of the stainless steel tube 8 of the anchor bolt 7. The anchor plate 9 and the washer 1 extend upward.
The nut 11 is screwed with the pin 0 interposed. Thereby, the PC steel materials 3... 4 are anchored to the girder 1. still,
The upper end of the anchor bolt 7 and the nut 11 are covered with an anchor cap 12 and a protective concrete 13.

At the lower end of the stainless steel tube 8, four horizontal fixing plates 8a, 8a, 8 as shown in FIGS.
are fixed to the lower surface of the girder 1 with anchor bolts 14 so that the stainless steel tube 8 is buried in the girder 1 without falling off. Also, a sealing 15 is provided inside the lower end of the stainless steel tube 8.
Are suspended from the center of the PC steel material.

Each of the above-mentioned PC steel members 3... 4 hangs the stairs 5 on the top floor at a predetermined position as shown in FIG. The length of the joint is changed, and a joint screw rod 17 is coaxially crimped to each lower end by an apartment 16.

As shown in FIG. 1, the above PC steel 3
… 4, besides stairs 5 on the top floor, stairs 5a on the lower floor
And a plurality of PC steel members 3a ... 4a ... for suspending the respective stairs 5a ... 5n to the lowest floor (the first floor) from this.
3n... 4n are prepared.
, 4a ..., 3n ..., 4n ..., joint threaded rods 17 are coaxially crimped by an apartment 16 at both upper and lower ends.

Each of the above-mentioned PC steel materials 3,..., 4a and 3a,
4a.. And 3a... 4a... 3n... 4n.
Are coaxially connected by the coupler 19 shown in FIG.

Further, as shown in FIGS. 2 to 4, a plurality of (four in the illustrated example) mounting brackets 18, 18... Are provided inside and outside the stairs 5, 5a. Each of the mounting brackets 1 is symmetrically and horizontally protruded at the same interval as the intervals b of the PC steel members 3, 3, 4 and 4.
Insert holes 2 penetrated in the vertical direction at 8, 18.
Each of the PC steels 3... 4... 3a.
a, 3n, 4n, joint screw rods 17, 1 at the lower end
7 are screwed into the joint screw rods 17, 17, and the mounting brackets 18, 18 are tightened by the upper nut 21 and the lower nut 22.
, 4, 4,..., The stairs 5 are suspended.

Next, a method for constructing a suspension staircase according to the present invention will be described in detail. As shown in FIG. 4, the joint screw rods 17, 17... At the lower ends of the plurality of PC steel members 3. After being inserted into the insertion holes 20, 20 of the mounting brackets 18, on the outer sides, the PC steel members 3,.
4 are tightened, the upper and lower nuts 21 and 22 are tightened, the stairs 5 are supported at a predetermined height and direction, and the PC steel materials 3.

Next, as shown in FIG. 4 and FIG. 9, the PCs on the lower floor are provided at the lower ends of the PC steel members 3.
By connecting the upper ends of the steel members 3a... 4a to the PC steel members 3... 4a coaxially with the PC steel members 3. After the joint screw rods 17 at the lower ends of the PC steel members 3a, 4a are inserted into the insertion holes 20 of the mounting brackets 18 on the stairs 5a on the lower floor.
The steel members 3a ..., 4a ... are tensioned, and the upper and lower nuts 2
1 and 22, the staircase 5a is supported at a predetermined height and direction, and the load of the staircase 5a is applied to the PC steel members 3a,.

By sequentially repeating the above-described operation procedure,
The stairs 5 on the top floor, the stairs 5a on the lower floor of the stairs 5, and the stairs on the lower floor of the stairs 5a are sequentially constructed from the upper floor to the lower floor, and finally the stairs 5n on the lowest floor are suspended. Thus, the entire suspension staircase is constructed.

After the completion of the hanging stairs, the condominium 16, the coupler 19, the nuts 21, 22 and the like exposed to the outside are subjected to a rust-preventive treatment by galvanizing. In addition, the burden of the stair load of the PC steel material is the largest on the top floor, and becomes smaller as going down the floor.
, 3a, 4a, 3n, 4n, ..., having a tensile strength corresponding to a stair load to be preliminarily applied.

Further, as shown in FIG. 2, the stairs 5, 5a... 5n of each floor are provided with anti-sway means by fixing them to the building body 2 with bolts 23, 23.

[0021]

The present invention is constructed as described above, so that the weight of the stairs can be reduced and the large-scale foundation work and the installation work of the columns as in the prior art are not required.
The construction period can be shortened, and the construction cost can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a hanging staircase according to the present invention.

FIG. 2 is a plan view showing a state where a girder of the hanging staircase is removed.

FIG. 3 is an enlarged plan view showing a part of a staircase on each floor in the above-mentioned hanging staircase.

FIG. 4 is an enlarged sectional view taken along line AA in FIG.

FIG. 5 is a sectional view taken along line BB in FIG. 4;

FIG. 6 is a longitudinal sectional view showing a state in which a PC steel material is anchored to a girder.

FIG. 7 is an enlarged front view of a portion (a) in FIG. 6;

FIG. 8 is a plan view of a stainless steel tube.

FIG. 9 is a cross-sectional view showing the uppermost floor of the PC steel material and the mounting state of the lowermost stairs.

FIG. 10 is a plan view of the coupler.

FIG. 11 is a longitudinal sectional view of the coupler.

[Explanation of symbols]

 1 girder 2 building body 3,3a, 3n, 4,4a, 4n PC steel material 5,5a, 5n stairs on each floor 18 Mounting bracket

Claims (2)

(57) [Claims] 1. A girder projecting from a rooftop floor of a building body,
A plurality of inner and outer PC steel materials anchored in two rows at a predetermined interval are connected to lower PC steel materials in sequence and suspended to the lowest floor, and each PC steel material is provided with stairs of each floor. A suspended staircase which is connected and supported so as to bear a stair load on each PC steel material. 2. A girder projecting from the rooftop floor of the building body,
Anchor a plurality of PC steel materials in two rows inside and outside at a predetermined interval, set the mounting bracket for the stairs at the bottom, then tighten and tighten the nuts to tighten the nuts on the top floor. And then each of the PC steels has a lower floor P
After connecting the C steel material and setting the lower staircase mounting bracket at the lower part of the PC steel material, tighten the mounting bracket with nuts to support the lower staircase, and repeat the above steps to repeat the above steps. A method of constructing a suspended staircase, comprising suspending and constructing the stairs in multiple stages from the bottom to the bottom.