JP3116135B2 - Preceding construction method of PC stairs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a precast concrete (hereinafter referred to as "PC").
That. The same as in the claims)
This is related to the precedent construction method for stairs.

(Conventional technology) A concrete staircase constructed on site has a complicated shape and a small space, so that the workability is extremely poor. In addition, even during the construction, the formwork and the rebar are used as a passageway, so that extra work such as rework to ensure accuracy was required.

Therefore, as disclosed in the official gazette of Japanese Patent Laid-Open No. 62-248748, the stairs are made in another place as made of PC,
Generally, a method of constructing a skeleton with an opening on the floor and then attaching a PC staircase is used.

(Problems to be solved) The skeleton is built with the floor of the staircase as an opening, and later
The conventional method of installing the PC stairs is
The staircase as a vertical passage does not work, and it is necessary to provide a passage in another place such as an external scaffold. In particular, in the case of an external non-scaffolding method which is expected to increase this time, it is difficult to secure a place for installing a temporary passage. In addition, safety facilities such as fall prevention fences are required at the floor openings,
At the time of construction of stairs, on the other hand, they have to be removed because they become obstacles, and there is a problem that extra work is required.

(Means for Solving the Problems) In the present invention, the above-mentioned problems are intended to be solved by constructing the PC stairs prior to the frame work.

In other words, the stairs are a lower floor board (1), a lower half step (3) connecting the lower floor board (1) and the lower floor board (2A) to each other, an upper floor board (2), the lower floor The landing board (1) and the upper-floor floor board (2) are connected to each other, and are divided into upper-stage steps (4).
Prior to forming the surrounding frame formed by the cast-in-place wall, placing the lower-floor landing board (1) on a mount (5) having an entrance and exit; ), The lower half step (3) is bridged between the lower landing board (1) and the lower floor board (2A), and an entrance is placed on the lower floor board (2A). Another stand provided (5)
Assembling, placing the upper floor plate (2) on the other frame (5), and mounting the upper floor plate (2) and the lower floor on the different frame (5) By mounting the upper half step (4) between the landing board (1) and
The temporary stairs are formed by standing the stairs individually at predetermined positions on the respective gantry (5, 5), and then the entire circumference of the stairs forming the temporary passages or the periphery of a part thereof is described above. The wall is constructed so that it can be swallowed by the cast-in-place wall, and after the concrete is cast, the gantry (5, 5) is removed to construct the stairs.

(Operation) According to the present invention, a temporary passage is formed by standing the PC stairs independently of the surrounding wall, and thus there is no need to provide a temporary passage in another place. Therefore, unlike the method described at the beginning, that is, the retrofitting method of the stairs, no opening is formed, so that it is not necessary to break the fall prevention fence.

Here, the use of reference numerals in the drawings is for the purpose of helping to understand the contents of the invention, and is not intended to limit the contents to the example of the drawings.

Example An example of the present invention will be described below with reference to the drawings.

In this embodiment, the PC stairs are a landing PC board (1), an upper floor PC board (2), a lower floor PC board (3), and an upper step PC board (4).
And a temporary steel frame (5) that receives them.

The above-mentioned landing PC board (1) is a lower floor landing board as a staircase component, the upper floor PC board (2) is an upper floor board as a staircase component, and the lower half step PC board (3) is The lower half step portion as the staircase component and the upper half step PC board (4) correspond to the upper half step portion as the staircase component, respectively. Here, the above-mentioned "lower floor landing board" is a lower floor board (floor PC board (2
A)) means a landing board installed on the same floor as the lower floor.

Sleeves (6) are embedded in the landing PC board (1) and the upper floor PC board (2), respectively. Also, on one side to be joined with the stepped PC boards (3) and (4), there is a joining hardware (7).
Receiving angle (7a) is embedded. Anchor hardware (8) protrudes from the other three sides.

Attachment angles (7b) are punched into the step PC plates (3) and (4) as bonding hardware (7).

The steel frame (5) has four pillars (9) and long beams (1
0), short side beam (11), and brace (12).

The pillar (9) is made of H steel, and has a base plate (13) at the lower end, and a positioning nut (14) at the center of the lower surface.
Are welded.

At the upper end of the pillar (9), a steel pipe (15) is attached, into which a screw type jack (16) is inserted. By turning the handle (16a), the height of the receiving object (16b) of the screw-type jack (16) rises and falls, and a dowel (16c) protrudes from the upper center of the receiving object (16b). .

First, the positioning nut (14) welded to the lower surface of the base plate (13) of the pillar (9) is inserted into the sleeve (6) of the landing PC board (1A) on the lower floor.
Tighten with the pedestal fixing bolt (17) from under the PC board (1A),
Make the pillar (9) stand alone while adjusting the building. Similarly, after the four pillars (9) are self-standing at predetermined positions, the short-side beam (11) and the brace (12) are attached to the pillar (9) and fixed. Subsequently, the beam (10) in the long side direction is bolted between the two columns (9), and the steel frame (5) is firmly fixed in both long and short side directions.

Turn the handle (16a) of the jack (16) at the top of the column (9), and adjust the level of the metal fittings (16b) at all four locations.

The landing PC board (1) is lifted by a crane or the like, and the dowels (16c) of the jacks (16) are fitted into the four sleeves (6) being driven, respectively, so that the steel frame base (5)
Put on top.

The lower half step PC board (3) is bridged between the landing PC board (1) and the floor (upper floor in the lower floor) PC board (2A), and the joint hardware (7) is tightened with bolts. Here, the floor PC board (2A) corresponds to the lower floor board.

Similarly, a steel frame (5) is assembled using the sleeve (6) driven into the floor PC board (2A), and the upper floor PC board (2) is placed thereon, Attach the upper half step PC board (4) between the PC board (1).

In addition, a steel frame support (5) supporting the landing PC board (1) on the first floor
In the case of (1), a column (9) having a short length is prepared, is self-supported on a concrete slab on the first floor, and is fixed with anchor bolts or the like.

In the embodiment, the stairway entrance is on the long side of the steel frame (5). However, if the brace (12) is obstructive and is provided on the short side, remove the brace (12) and replace it. Reinforce the PC stairs so that it does not shake with a stick or the like.

In this way, a temporary passage is formed by a stair that is singly stood at a predetermined position on each of the mounts (5, 5).

As described above, cast-in place concrete (18)
Formwork and rebar work are carried out so as to be embedded in the wall, and concrete is poured.

When the stepped PC boards (3) and (4) are swallowed into the wall, as shown in Fig. 9, only the oblique slab part should be swallowed to simplify the processing of complex-shaped formwork. You can also.

After the concrete strength is developed, the steel frame base (5) is sequentially dismantled in the reverse order of assembly. That is, braces (12),
After removing the bolts of the short side beam (11) and long side beam (10) and disassembling them, loosen the jack (16) of the column (9), remove the column base fixing bolt (17) and remove the column base ( 9) Remove.

 With the above, the PC stairs are completed.

(Effects of the Invention) In the present invention, since the PC stairs are constructed independently by using a steel frame, the stairs have already been almost completed in the skeleton process. Therefore, it can be used as an immediate passage for skeleton work, and it is not necessary to install temporary stairs on scaffolds or other places as in the past.

Furthermore, since there is no floor-opening at the position of the stairs, there is no need to break down the fall prevention fence or the like, and labor is saved, the process is shortened, and safety is further improved.

In addition, since the steel frame base has no brace because the long side direction has a ramen structure, a walkable passage is sufficiently ensured even before the base is dismantled and removed.

In addition, there is almost no cost burden because the steel frame base can be converted to each floor or to other buildings.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a plan view thereof. FIG. 3 and FIG. 4 are detailed views of the column cap and column base of the steel frame mount, respectively. FIG. 5 is a sectional view of the metal joint, FIG. 6 is a plan view of the same, and FIG. 7 is a perspective view showing a joining method. FIG. 8 is a cross-sectional view showing the landing and the upper floor floor PC board in a state where the RC wall is swallowed. 1: Landing PC stairs, 2: Upper floor PC board 3, 4: Step PC board, 5: Steel frame 6: Sleeve, 7: Joint hardware 14: Positioning nut, 16: Jack 17: Column base fixing bolt 18: Shows cast-in-place concrete.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E04F 11/00-11/116 E04G 13/06

Claims (1)

(57) [Claims] 1. A staircase comprising a lower-floor landing board (1), a lower half-step (3) connecting the lower-floor landing board (1) and the lower-floor floorboard (2A) to each other, an upper-floor floorboard (2), The lower-floor landing board (1) and the upper-floor floorboard (2) are connected to each other, and are divided into upper-stage (4) staircase components.
Prior to forming the surrounding frame formed by the cast-in-place wall, the lower floor landing board (1) is placed on a mount (5) having an entrance and exit, and the mount (5) ), The lower half step (3) is bridged between the lower floor board (1) and the lower floor board (2A) placed on the lower floor board (2A).
Assembling another platform (5) with a doorway on it, placing the upper floor plate (2) on this another platform (5), and placing it on the another platform (5). The upper half step (4) is mounted between the upper floor board (2) and the lower landing board (1) on which the stairs are mounted, and the stairs are moved by the mounts (5, 5). A temporary passage is formed by standing independently at a predetermined position, and thereafter, the entire periphery of the stairs or a part of the stairs forming the temporary passage is swallowed by the cast-in-place wall and the wall is formed. A PC characterized by building and removing the above-mentioned pedestals (5, 5) after casting concrete to build stairs
Advance construction method for stairs.