JPS6051253A - Precast concrete upstairs - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a staircase mainly constructed during construction of a multi-story concrete building, and more particularly to a concrete staircase consisting of a staircase slab section, a step section, and a handrail section.

Conventionally, the stair slab part, steps, and handrail part were constructed integrally by pouring concrete on site, but in this case, the following [I], (Ill
, [There was a problem as shown in 111.

January: Complicated and labor-intensive reinforcing work, formwork work, and concrete pouring must be carried out within a restricted three-dimensional space on site, and the formwork must be removed from the time of concrete pouring. It is necessary to allow a certain curing period before the construction, and in addition, it is necessary to carry out repair work and finishing work after removing the formwork, which requires a large amount of construction cost and construction time overall.

[113 Due to on-site construction, there is a possibility that the performance of the concrete will deteriorate due to the occurrence of jangka slabs, etc.
Ensuring quality is essential.

Field: In order to ensure the required construction accuracy, advanced construction techniques are required, and this also tends to increase the construction period.

In particular, this problem concerns the quality of the frame workers, such as carpenters and reinforcing steel workers.

In view of today's labor situation, where there is a shortage of quantity, this trend is becoming even more pronounced.

In addition, to date, several PC stairs have been devised and implemented, but in the case of this one, the following fi+, [2
There was a glume as shown by +.

(11) Conventional PC stairs were manufactured in one piece, so they were heavy and required a large lifting machine, making it difficult to use in small-scale workshops without large lifting machines.

(2) Conventional PC stairs were manufactured in one piece, so whenever the dimensions or angle of the stairs changed, the PC stairs were completely redesigned and a new steel formwork was manufactured.
It took a lot of time and money to make the stairs, and the conversion efficiency of the formwork was low, resulting in a cost of 14.

The present invention has an object to improve the above-mentioned problems of stair construction.

The characteristic structure of the precast concrete staircase according to the present invention, which has been taken to achieve such an object, is that the stair slab part, the step 1 and the handrail part are each made of precast concrete slabs, and the stairway In the slab section, 6fl &! , a step part that can support the step part and Oa
4 straightening tools are provided on the 1" plate and the unevenness for the above-mentioned step part, and the
A metal fitting that can be inserted and fixed from above to the stair slab part is provided, and the handrail part further includes a 1-1" plate for the stair slab part instep of the staircase adjacent to the upper Fl, and a tread plate forming part of the step part. The lower side is loaded with J'ke 6F function, and
The stair puffer part is provided with a supporting part having a connecting plate for the four-plate support and an unevenness adjusting device.

The functions and effects of the above characteristic configuration are as follows.

<Function> (a) Either the stair slab part, the step part, and the handrail part are manufactured separately in advance in a well-equipped factory in a size that is easy to fit, or C) the quality control of these parts is carried out. Not only can it be done reliably and easily, but the manufacturing accuracy is also i1.
In addition, the transportation of precast versions of each part can be carried out efficiently and easily.

(b) At the construction site, transportation is prohibited. All you need to do is to assemble the precast versions of each part in the prescribed procedure via the plate, connecting plate, etc. 11 It is possible to easily and safely construct a staircase with mechanical strength without requiring any skill, and it is possible to easily and safely construct a staircase with mechanical strength. It is possible to eliminate the need for facilities.

0→ Even if there is a construction error on the frame side of the building object, this error can be easily absorbed by the unevenness adjusting device provided on the stair slab portion and handrail portion.

<Effects> For the precast concrete staircase made into parts, the membrane support of the stair slab unit was changed by changing the installation interval of the jaws, changing the tread dimensions and riser dimensions of the step unit, and changing the support jaw part of the stair unit. , it can be manufactured at any angle, the angle can be changed by making some changes to the formwork, there is no need to create a new one, and the efficiency of formwork conversion can be increased.

Therefore, it has become possible to safely and efficiently construct a staircase that is superior in quality while shortening the construction period and reducing construction costs.

In addition, as shown in the examples below, if the stair slab section 1]f1 has r'c steel wire embedded in it, the stair slab section should be made as thin as possible to make it lightweight. There are advantages that can be achieved.

As a result, even a small lifting machine can lift a load of 15 at the time of on-site inspection at 11.
It has now become a fire function, allowing the use of PC stairs, which until now could not be used in small-scale workshops without large lifting equipment.

Furthermore, if the step part is divided into a plurality of parts each having a predetermined number of steps, and the fixing metal fitting is configured to also serve as a metal fitting for fixedly connecting adjacent divided step parts, then the step There is an advantage that the divided stepped portions of the section can be easily carried with less effort, and the connecting structure of these divided stepped portions can be simplified.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in Figures 1 to 8, the pre-geast concrete stairs that are rented between the lower floor (Fl) and upper floor (F2) of a multi-story concrete building consist of 1 The stair slab part tl), the step part (2), and the handrail part (3) are each made of precast concrete slabs (h).

The stair slab portion (1) is the floor portion (Fl).

The stepped portion t41 formed on (F2), (stepped portion (IA), CIA placed and supported on 4+) and the step portion (2)
) Each tread forming part (2a) and the lower surface of the temple can be placed and supported in a horizontal or almost horizontal position.
IB) e・and storage for one step bar opening upward (
= J ° hole (1 (:)... is formed, and the fII step part (2
) of the metal mounting plate (H+
)..., furthermore, the step part (IA), CIA
) (IE)
, (IE) are respectively provided with the floor portions (F,) at two longitudinal locations.

An L-shaped metal plate f71 fixed to the steps +41 and +4+ of (F2) (an uneven adjustment tool consisting of a bolt (54) and a nut (5B) that can contact 71 for 5R)
61.

There is still #:j:, PC@ line () in this stair slab part (]).
6) is buried.

The step part (2) is composed of a crotch part (2A) which is divided into one step at a time and is L-shaped when viewed from the side. S split step part step part)... O-leg forming part (2h) 0K Step board forming part (2a) of the adjacent split step part (2A) located below U1 K-formed hole (2C
) is inserted into the interlocking hole (IC) of the stair slug part (1) to fix it l'I (this is an example of a fixing metal fitting including 1α) (2B), and at the top The tread plate forming portion (2a) of the divided step portion (2A) located therein includes:
An L-shaped reinforcing bar (an example of an insertion fixing metal fitting), '(2B'), which can be inserted and fixed, is provided in the intake hole (IC) of the stair slab part (1).

The handrail part (3) is provided with a plate (3A) on the south vertical side of the handrail part (3) for the metal plate (IF) fixed to the stair slab part (11) of the stairs adjacent to the third floor, and On the side side part, the support part (8C) which is inserted into the space (81) formed between the OrI staircase slab part (11 and the step part (2)), The support portion (3c) is provided with a protruding structure so that a part of the weight of the step portion (
2) A mounting support surface for the tread forming part (2a) K and a connection (gray) (13B) for the storage (j play) (H)) of the stair slab part il+ are provided.

Said connection plate (8B) - ridge, [-'connection gray located on both sides) (,'3r(), (8B)
and the corresponding mounting plate) (H)), (ID
) are each provided with an unevenness adjustment (8).

The said unevenness adjuster (8) is attached to the fourth ['&I, as shown in the connection play] (8B) with a hard nut (8A).
) is screwed into the vertical adjustment bolt (8B) and the 1τ1 plate (ID) is screwed into the Nando (8C) accompanying K. Sah
There is.

[Brief explanation of the drawing]

The drawings show an implementation example of a precast concrete staircase according to the present invention, FIG. 1 is a side view, and FIG. 2 (tJ: (
rF view, Figure 3 is an enlarged vertical sectional side view of the main part, Figure 4 iJ
, is an enlarged front view of the four parts. il+... Stair slab section, (lB)...
・Ran+I%, (LD)・・・Collection 1” plate, (
2)...Tread 1α part, (2A).../A
;1IIJ step part, (2a) --Tread plate formation ITI (
,,(2B)...Fixing bracket, (3)...Handrail part, (3A)...]■1" Play l-1'(
3B)...Connection plate, (8C)...
・Support part, +51, (s)...Unevenness adjuster, (6)...PC steel wire. Continuing from page 1 ■ Inventor Sakajiri Differentiation: @ Inventor Shiba 1) Naoki @ Inventor Numa 1) Mitsuharu [phase] Inventor Sakako Keizai @ Inventor Rise Toshiyuki [L 4-1 Odori Nishi, Chuo-ku, Horo City Address Takenaka Corporation Kitamaido Branch

Claims (1)

[Claims] ■ The stair slab part +11, the step part (2), and the handrail part (3) are each made of a precast concrete slab, and the stair slab lfRIll has a 111-marked part (2). 1 role part (113) that can be placed and supported and fj
A collection 1q brake 1 (N, +) and an uneven Q% tool (5) are provided for the handrail part (a), and
Said step 1! (For < +21, 1] A metal fitting (2
B) is provided, and the handrail portion (3) is further provided with J:,
The mounting plate (8A) for the 1-step slab part il+ of the instantaneous contact staircase is capable of supporting the lower surface of the tread forming part (2a) of the step part (2), and 1]
Stair slab 1τ marked q (S111 collection play) (I
D) A precast concrete staircase provided with a supporting section (3C) and a contour adjustment (8) (8B). (2) The precast concrete staircase according to item (2) of the cap section of the patent claim, wherein the stair slab section fil has a PC steel wire (6) embedded therein. ■ The step part (2) is divided into a plurality of parts each having a predetermined number of steps, and the fixing metal fitting (2B) is also a metal fitting for fixedly connecting the adjacent divided step parts (2A) and (2A). The precast concrete staircase according to claim 0 or 0, which has a dual-purpose structure.