JPS647845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a component of a concrete staircase that is mainly constructed during construction of a multi-story concrete building, and more specifically, to a support that can be placed on a lower structure and an upper structure, respectively. The present invention relates to a formwork for manufacturing a concrete stair slab having a step part and a step part for mounting and supporting a step part.

This type of formwork manufactures only the stair slab independently, so compared to conventional formwork that manufactures the stair slab and steps integrally, it is not only easy to handle during concrete pouring. This method has the advantage that the transport work of the manufactured precast concrete stairs to the construction site and the assembly work at the construction site can be carried out efficiently, safely and easily with less labor.

The present invention further improves the formwork having these advantages, and provides an economical concrete stair slab that can accommodate changes in tread dimensions and riser dimensions, changes in stair length, changes in stair construction angle, etc. Its purpose is to provide formwork.

The characteristic configuration of the formwork for concrete stair slab according to the present invention, which was taken to achieve such an object, is that the bed formwork forming the lower surface of the stairway slab has a first support surface forming the support surface of the lower support part. A formwork, a second formwork that forms a support surface of the upper support part, a third formwork that forms both left and right side surfaces of the stair slab in its longitudinal direction, and a fourth formwork that forms the step part. The first mold frame and the second mold frame are configured such that the mounting angle can be changed and fixed to the bed mold frame freely, and at least the first mold frame and the second mold frame are The fourth formwork and the fourth formwork are configured such that their attachment positions can be changed and fixed to the bed formwork in the longitudinal direction of the stair slab.

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

By changing the mounting position of the fourth mold for forming the step in the longitudinal direction of the stair slab with respect to the bed mold, the tread dimensions and riser dimensions of the step can be freely changed. Moreover, the mounting angle of the first formwork and the second formwork with respect to the bed formwork is changed, and at least one of the first formwork and the second formwork is moved in the longitudinal direction of the stair slab with respect to the bed formwork. By changing the mounting position, the stairway construction angle and stair length can be freely changed while ensuring that the supporting portion of the stair slab is mounted and supported on the structure.

Therefore, since a single formwork can accommodate various design changes, there is no need to create a new formwork every time a design is changed. It has now been possible to efficiently and economically manufacture concrete stair slabs of the same dimensions.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, as shown in Figure 1, between the lower floor part (an example of a lower structure) _F1 and the upper floor part (an example of an upper structure) _F2 of a multi-story concrete building. To explain the stair slab ₁ of _the precast concrete staircase constructed over _a period _of Part 1
A, 1B, each tread forming part 2a of the step part 2... a step part 1C which is approximately trapezoidal in side view and whose lower surface can be placed and supported in a horizontal or nearly horizontal position, and a step part 1C which opens upward. At the same time as forming the mounting holes 1D..., a plurality of holes along the longitudinal direction of the stair slab 1 are formed.
It is constructed by burying PC steel wires 3 at appropriate intervals in the left and right direction.

The step portion 2 is composed of step portions 2A that are substantially L-shaped in side view and are divided into a plurality of steps in units of steps, and each of these divided step portions 2A...
The leg forming part 2b... has a hole 2c formed in the tread forming part 2a of the adjacent divided step part 2A located below.
A reinforcing bar (which is an example of an insertion fixture) 2B that can be inserted and fixed into the mounting hole 1D of the stair slab section 1 through the tread plate forming section 2a of the divided step section 2A located at the top is provided with the above-mentioned An L-shaped reinforcing bar (an example of an insertion fixture) 2 that can be inserted and fixed into the mounting hole 1D of the stair slab 1
B′ is provided.

Next, the steel formwork of the concrete staircase slab 1 constructed as described above will be explained. As shown in FIGS. 2 and 3, this is a bed mold forming the lower surface 1a of the staircase slab 1. The frame 4 includes a first mold 5 forming a mounting support surface 1b for the lower support section 1A and a mounting support surface 1d for the upper support section 1B.
and the left and right side surfaces 1e, 1 of the stair slab 1 in its longitudinal direction.
3 formworks 7, 7 and each of the step portions 1 forming e.
A fourth formwork 8 forming C... is provided.

As shown in FIGS. 4 to 6, the first mold frame 5 includes a base mold material 5A, a molding mold material 5B on the mounting support surface 1b of the lower support part 1A, and a continuous arrangement between these two materials 5A and 5B. It is composed of a plurality of double-reinforced plates 5C... and is attached to the bed form 4 and the third forms 7, 7 in the following manner.

That is, the bed formwork 4 is provided with mounting plates 9A, 9 for the intermediate reinforcing plates 5C, 5C of the first formwork 5.
The pedestal 9, which has a long hole 9C formed in the base frame 9B along the longitudinal direction of the stair slab 1, is attached via bolts 10, and the bolt hole formed in the bed form 4 is attached. A plurality of holes 4a are formed at appropriate intervals in the longitudinal direction of the stair slab 1, that is, with pitches (P ₁ ) having the same length as the elongated holes 9C. The formwork 5 is attached via a hinge 12 so as to be able to swing up and down about the left and right horizontal axis _X1 .

Further, on the third formworks 7, 7, the mounting side frames 13, 13, which are rectangular in left and right side views, and the auxiliary side plates 14, 14, which are triangular in shape, are installed with bolts and nuts 1, respectively.
0 and 11, and the holding formwork 15 is bolted to the tread if of the lower support part 1A of the stair slab 1 over the auxiliary side frames 14 and 14.
Attached via nuts 10, 11, the intermediate reinforcing plates 5C, 5C of the first formwork 5, the mounting plates 9A, 9A of the pedestal 9, and the reinforcing plates 5C on both left and right lateral outer parts of the first formwork 5, 5C and the mounting side frame 1
3 and 13 respectively as bolts and nuts 10 and 11...
furthermore, the mounting plate 9 of the pedestal 9
The bolt insertion holes 9a, 13a _, .

Therefore, by vertically swinging the first formwork 5 around the swinging horizontal axis _X1 of the hinge 12, the attachment angle of the first formwork 5 to the bed formwork 4 can be freely changed. By selecting the screwing positions of the bolts 10 in the bolt holes 4a of the bed formwork 4 and adjusting the mounting position of the pedestal 9 within the range of the elongated holes 9C formed in the pedestal 9, the bed can be fixed. The attachment position of the first formwork 5 to the formwork 4 can be freely changed in the longitudinal direction of the stair slab 1.

Further, an elastic membrane 16 made of soft vinyl or the like is fixed to the base material 5A of the first formwork 5 to close the gap with the bed formwork 4, and the PC steel wire 3 Elongated holes 17 are formed at appropriate intervals (P ₂ ) in the left-right direction to allow the PC steel wire to be inserted through the elongated holes 17 through which the PC steel wire is planned to be inserted. A box-shaped support member 18 made of an iron plate is provided on the front surface to penetrate and hold the PC steel wire 3 at a predetermined level.

The box-shaped support member 18 is used during mold release work.
By removing it from the PC steel wire 3, the recessed space of the stair slab 1 formed by the support member 18 can be used to easily cut the PC steel wire 3 and perform repair work after cutting.

Incidentally, the elongated hole 17 which does not require the passage of the PC steel wire 3 is closed with plastic tape 19 as shown in FIG.

The fourth mold 8 includes box-shaped molds 8A, 8A that are approximately trapezoidal in side view and can be placed on the upper surfaces of the third molds 7, 7, and these box-shaped molds 8A, 8A.
A first presser member 8B is installed on the inclined surface of the box via bolts and nuts 10, 11, and a bolt and nut 1 is installed on the vertical surface of the box-like members 8A and 8A.
0 and 11, and further includes a box-shaped member 8A and a third holding member 8C.
The formwork 7 is constructed so that it can be tightened and fixed via a vise 20 and can be released from the fixation.

Therefore, when the front vise 20 is released, the attachment position of the fourth formwork 8 relative to the bed formwork 4 and the third formwork 7 can be freely changed in the longitudinal direction of the stair slab 1. At the same time, by replacing the box-shaped profile 8A, the mounting angles of the presser profiles 8B and 8C can be freely changed.

A molded rod 21 for forming the attachment hole 1D is attached to the first holding member 8B via a bolt 10. The bolt insertion hole 8b formed in the first holding member 8B is formed into a long hole, and is configured to allow the attachment position of the forming rod 21, in other words, the formation position of the attachment hole 1D to be freely changed.

As shown in FIGS. 9 to 12, the second formwork 6 is separable at an inclined surface passing through the outermost end surface portion 1d' of the mounting support surface 1d of the upper support portion 1B, and is separated by a bolt. - It is composed of a pair of upper and lower mold members 6A and 6B fixedly connected via nuts 10 and 11, and is attached to the bed mold frame 4 and the third mold frame 7 as follows.

That is, the two divided mold members 6 are attached to the bed formwork 4.
A, 6B reinforcing plates 6a, 6b..., which are located in the middle part in the left-right direction, are attached to the pedestal 22 with mounting plates 22A through bolts 10. Pedestal 22
The base frame body 22B includes the lower divided molded member 6B.
The hinge 2 can be freely swung up and down around the left and right horizontal axis X ₂ .
It is attached via 3.

Further, on the third formworks 7, 7, the mounting side frames 24, 24, which are rectangular in left and right side views, and the auxiliary side frames 25, 25, which are triangular in shape, are attached to the bolts and nuts 1, respectively.
0 and 11, and a holding form frame 26, which is approximately L-shaped in side view, is attached between the auxiliary side frames 25, 25 and the box-shaped shapes 8A, 8A of the fourth form 8 adjacent thereto. It is constructed via bolts and nuts 10 and 11, and the two split sections 6A,
Intermediate reinforcing plates 6a, 6b of 6B, mounting plates 22A, 22B of pedestal 22, and both split sections 6A, 6B
The reinforcing plates 6a, 6b on the left and right outer sides of the mounting frame 24, 24 are connected with bolts and nuts 10, respectively.
11, and bolt insertion holes 22a formed in the mounting plate 22A of the pedestal 22.
. . . and bolt insertion holes (not shown) formed in the mounting side frames 24, 24 are formed into long arc-shaped holes centered on the horizontal swing axis _X2 of the hinge 23.

Therefore, by vertically swinging the second formwork 6 around the swing horizontal axis _X2 of the hinge 23, the attachment angle of the second formwork 6 to the bed formwork 4 can be freely changed. can.

Further, the lower split mold material 6B includes a first mold frame 5.
As in the case of , the elastic membrane 27 that closes the space between the bed formwork 4 and the elongated hole 28 for guiding the PC steel wire through...
Also provided are a box-like support member 29 for holding the PC steel wire passing through and a plastic tape 30 for closing the long hole.

In the figure, 31 is a base frame 22B of the pedestal 22.
This is a guide that fixes the height position of the PC steel wire 3 attached to the.

In the above embodiment, only the mounting position of the first formwork 5 with respect to the bed formwork 4 is configured to be changeable in the longitudinal direction of the stair slab 1, but instead of this, or this first formwork 5 and the second formwork The mounting position of the frame 6 may be changed and fixed in the longitudinal direction of the stair slab 1.

Next, the method of using the formwork shown in the above embodiment, that is, the procedure for forming a concrete stair slab using the formwork will be explained as follows.

That is, the formwork assembled as in the above embodiment is positioned so that its bed formwork 4 is horizontal, and in this state, as shown in FIG. Between the adjacent fourth formworks, between each of the fourth formworks 8, and between the first and second holding members 8B and 8C constituting the fourth formwork 8, respectively, Since the top is open,
Concrete is poured into the open portions 8' and 8D and poured.

In addition, in the first formwork 5 portion, as shown in FIG. Concrete is poured and poured. The diagonally upward facing surface of the open portion 5D is finished along the pressing surface of the holding formwork 15 using a trowel or the like.

In the 6th part of the second formwork, as shown in Fig. 11,
An open part 6D is formed between the pair of upper and lower mold members 6A, 6B and the holding formwork 24, and concrete is poured and poured from this open part 6D.

The concrete poured into the formwork to form this concrete stair slab is at a higher level than the concrete poured into the open portion 8' between the fourth formworks 8 at the time of pouring. To prevent the concrete in the first, second, and fourth formworks from flowing out toward the open portion 8',
The water/cement ratio was determined by conducting appropriate slump tests. Note that the open portions 8', 8D, 5D, and 6D of this formwork are not directly involved in contact with other objects, so there may be slight bulges or
Unevenness may occur.

[Brief explanation of drawings]

The drawings show an embodiment of the formwork for concrete stair slabs according to the present invention, and Fig. 1 is a longitudinal cross-sectional side view of the concrete stair slab, and Figs. 2 and 3 are a plan view of the entire formwork and a partial cutaway. A front view, FIG. 4 is a side view of essential parts showing the relationship between the first formwork, FIG. 5 is a sectional view taken along the line - - of FIG. 4, FIG. 6 is a view taken along the - line of FIG. 4, and FIG. , FIG. 8 is a partially cutaway front view and a partially cutaway side view of the main parts showing the relationship between the fourth formwork, FIG. 9 is a plan view showing the relationship between the second formwork, and FIG. 10 is the same as that shown in FIG. 11 is a sectional view taken along the line XI-XI of FIG. 9, and FIG. 12 is a view taken along the line XII-XII of FIG. 9. F ₁ ... lower layer structure, F ₂ ... upper layer structure, 1...
...Stair slab, 1A, 1B...Support part, 1C...
Step part, 2... Step part, 4... Bed formwork, 5...
First formwork, 6... Second formwork, 7... Third formwork, 8
...Fourth formwork.

Claims (1)

[Scope of Claims] 1. A concrete staircase comprising support parts 1A and 1B that can be placed on the lower structure _F1 and the upper structure _F2 , respectively, and a step part 1C on which the step part 2 is placed and supported. The bed formwork 4, which is a formwork for manufacturing the slab 1 and forms the lower surface of the stair slab 1, includes:
First formwork 5 forming the support surface of the lower support portion 1A
and a second formwork 6 forming the support surface of the upper support part 1B, and a third formwork 7 forming both left and right side surfaces of the stair slab 1 in its longitudinal direction, respectively.
7 and a fourth formwork 8 forming the step portion 1C, of which the first formwork 5 and the second formwork 6 are configured to be able to change the mounting angle and fix to the bed formwork 4. At the same time, at least one of the first formwork 5 and the second formwork 6 and the fourth formwork 8 can be attached to the bed formwork 4 in the longitudinal direction of the stair slab 1 so that the attachment position can be changed and fixed. Formwork for concrete stair slabs consisting of. 2. The concrete staircase according to claim 1, wherein the first formwork 5 and the second formwork 6 are provided with elastic membranes 16 and 27 that close the gap with the bed formwork 4. Formwork for slabs. 3. The concrete stair slab according to claim 1, wherein the second formwork 6 is removably divided into two by a slope passing through the outermost end surface of the upper support part 1B of the stair slab 1. Formwork for. 4. The formwork for a concrete stair slab according to claim 1, wherein the means for fixing the fourth formwork 8 to the third formworks 7, 7 so that the mounting position can be changed is a vise.