JPH0823212B2 - Formwork equipment for PC stairs - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork device for PC (precast concrete) stairs.

[0002]

2. Description of the Related Art When a PC (precast concrete) staircase is manufactured in a PC (precast concrete) factory, a steel form 1 is used as shown in FIGS. This steel formwork 1 has a box shape, but its bottom plate portion is for raising to form integrally the riser 3 and the tread 4 at each step of the PC (precast concrete) stairs 2 to be produced. A number of combinations of the vertical plate 5 and the tread horizontal plate 6 are formed.

In this manner, although not shown, the steel staircase 1 is laid out in the steel form 1, concrete is poured, and after hardening, the PC stairs 2 as a product is taken out.

[0004]

In such a conventional mold, the size of the PC staircase 2 which can be manufactured by one mold is fixed. On the other hand, when the buildings themselves are different, the floor heights are different even when the installation floors and places are different even in the same building, and the PC stairs 2 to be installed often have various sizes. In order to deal with various types of PC stairs 2 having different sizes, conventionally, it was necessary to prepare the steel formwork 1 according to the number, which was very costly and troublesome.

On the other hand, in Japanese Utility Model Publication No. 58-26102, there are many forms for P and C concrete stairs in which the inclination, the width, the width of the landing, the height of the rise and the like can be arbitrarily changed. In FIG. 3, a bent frame having a substantially L-shaped cross section is formed through a long hole formed corresponding to each other by bolts and nuts and fastened to form an inner frame having a substantially sawtooth cross section.

By shifting and fixing the bending frames to each other, it is possible to change the stepping width and the rising height of the stairs formed.

However, in the Japanese Utility Model Publication No. 58-26102, a bending frame having a substantially L-shaped cross section is combined to form a sawtooth-shaped middle frame. Since the joint ends of the bending frames are located, the molded concrete stairs will create steps of the thickness of the bending frame during stepping and kicking up, and the finishing process such as repair to hide this will be done manually. It must be made.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, and it is possible to manufacture many kinds of PC stairs of different floor heights by using only one formwork, and the stairs to be manufactured are after demolding. Is a beautifully finished product that can be installed as a finished product without any modification, and can streamline the work and reduce the manufacturing cost, as well as secure a large tread depth, and a staircase with a novel design. PC obtained
To provide a formwork device for stairs.

[0009]

In order to achieve the above-mentioned object, the present invention provides a vertical riser plate for integrally forming a riser and a tread in each step of a PC (precast concrete) stair to be produced. In a formwork device for a PC staircase in which a large number of combinations with tread horizontal plates are provided, the vertical riser plate is vertically divided into a combination of an upper divided body and a lower divided body, and an upper divided body and a lower divided body. The divided body is slidably overlapped with each other so that the upper divided body overlaps the outer side of the lower divided body, and the upper divided body is integrally provided as a front end extended portion of the tread horizontal plate. In addition, the inside is made hollow so as to have a thickness, and the front side thereof rises in a taper shape from the lower end of the joint with respect to the lower divided body whose front surface is a vertical surface, and above that becomes a substantially vertical surface, and Coat with the tread horizontal plate which is the upper end Over portion is for the subject matter that was formed to be round shape corners.

[0010]

According to the present invention, the vertical plate for the raising surface is formed by superposing the upper and lower divided bodies in a slidable manner, and the PC stairs to be produced by changing the degree of the superposition have the raising height of each step. Different stairs can be obtained, and PC stairs can be obtained which can accommodate different floor heights even if the number of steps is the same.

Moreover, the rise and the tread of each step of the PC stairs are formed by a combination of the vertical rise plate and the horizontal tread, and the combination of the lower divided body and the upper divided body of the vertical rise plate. In addition, the top of the kicking surface projects and the bottom of the kicking surface retracts, so a large tread depth can be secured, and a staircase that is innovative in terms of design can be obtained.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a vertical sectional side view of an essential part showing a first embodiment of a PC stair formwork device of the present invention, FIG. 2 is a vertical sectional side view of an essential part showing an elevating device, FIG. 3 is a rear view of the same, and FIG. It is a side view of the whole.

First, referring to FIG. 4 as a whole,
A concave portion 8 for forming PC stairs is formed on the pedestal 7. The concave portion 8 is located on the left and right and has a substantially horizontal landing portion forming portion 8a and a stair portion forming portion where the bottom portion has a staircase shape in the central portion. 8b is continuous.

In the figure, 9 is an end plate for partitioning the end of the landing portion forming portion 8a, and 10 is a bottom plate. This bottom plate 10 has a water gradient so that the landing of the molded PC stairs becomes lower on the side opposite to the stairs. And a tapered surface, and a ridge 11 for forming a drainage groove was provided at the end thereof.

Further, both the landing formation portion 8a and the stair formation portion 8b have side plates 12 raised on both left and right sides. The side plates 12 are integrally raised from the bottom plate 10 or via other connecting members. And is connected to the gantry 7.

Also in the present invention, the step forming portion 8
As a bottom portion forming b, as shown in FIGS. 1 to 3,
Vertical plate for raising 13 to form the rise and tread in each step of PC (precast concrete) stairs integrally.
It is the same as the above-mentioned conventional example that a plurality of combinations of the above and the tread horizontal plate 14 are provided.

According to the present invention, the raising vertical plate 13 is composed of a combination of an upper divided body 13a and a lower divided body 13b, which are divided into upper and lower parts, and the upper divided body 13a, the lower divided body 13b, and end portions. Polymerized slidably on each other. In this case, the upper split body 13
The a is overlapped with the outside of the lower divided body 13b.

Further, the upper divided body 13a is the lateral plate for the tread.
14 is provided integrally with this as a front end extended portion, and has a thickness by making the inside hollow, etc., and its front side is tapered from the lower joint end to the lower divided body 13b whose front surface is a vertical surface. Ascending, the surface is almost vertical, and the corner with the tread horizontal plate 14 at the upper end is a rounded corner.

The lower divided body 13b is a bottom plate protruding rearward.
28 and the side plate 15 are provided to form a box body, and the side plate 15 is formed with a vertical notch-shaped slit 16 opening at the upper end. Further, the tread lateral plate 14 integrated with the upper divided body 13a is also provided with a side plate 17 directed downward, and a lateral bolt 27 having a tip screwed to the side plate 17 is inserted into the notched slit 16 in the middle thereof. Then, the side plate 15 and the side plate 17 can be fastened with the bolt 27 at an arbitrary overlapping position.

The lower divided body 13b is mounted on the pedestal 7 and the bottom plate 10 via a bracket 18 for bolting the bottom plate 28 thereof.
It is connected to the side plate 12 integrated with the fixed plate 20 provided on the side plate 12 and is fixed and immovable integrally with the pedestal 7, the bottom plate 10 and the side plate 12.

On the other hand, between the lower split body 13b and the upper split body 13a, and between the horizontal treads 14 for the tread surface, the lower split body 13 in a fixed state is provided.
An elevating device 19 for elevating the upper divided body 13a and the tread horizontal plate 14 is interposed with respect to b. In this embodiment, the lifting device 19 is a nut 19a provided on the bottom plate 28 of the lower divided body 13b, and is screwed to the nut 19a to move up and down, and
A screw-type jack structure has been adopted in combination with a bolt 19b whose head comes into contact with the rear surface of the tread horizontal plate 14.

Next, the usage will be described. Bolt 27
Loosen to release the fastening between side plate 15 and side plate 17,
By vertically moving the bolt 19b with respect to the nut 19a of 19, the upper divided body 13a and the tread horizontal plate 14 are moved vertically with respect to the lower divided body 13b. As a result, the overlapping portion of the upper divided body 13a and the lower divided body 13b is changed, and
13 heights can be freely determined.

After the height of the vertical riser plate 13 is determined in this manner, the side plates 15 and 17 are fastened with the bolts 27. This operation is performed uniformly for each stage. In addition, the rear end of the tread horizontal plate 14 and the vertical vertical plate 13 for raising the step above it.
When a gap is created between the lower divided body 13b and the lower end of
A non-slip material 23 which is placed in advance on the PC stairs to be molded is arranged at this portion and is closed by this, or a closing plate 22 is projectingly provided from either one and the gap is closed by this.

Although illustration is omitted, when the concrete is stood in the concave portion 8 for forming the PC stairs, concrete is placed, and after curing, the landing part 21a and the stair part 21b are integrated as shown in FIG. You can get the PC stairs 21.

The rise 3 and tread 4 of each step of this PC stair 21
Is formed by combining the vertical plate 13 for raising and the horizontal plate 14 for tread, and the lower divided body 13b of the vertical plate 13 for raising as described above.
With the combination of the upper divided body 13a and the upper divided body 13a, the upper part of the riser 3 is projected and the lower part is retracted, so that a large depth of the tread 4 can be secured and a novel staircase can be obtained in terms of design.

By the way, the upper divided body 13 of the vertical plate 13 for raising
Reference numeral a denotes a taper-like rising from the lower end of the joint with respect to the lower divided body 13b, and the riser 3 of each step of the PC stairs 21 also has a taper surface adapted to this taper shape. Therefore, FIG.
As shown in Fig. 7, the pedestal 7 is pivotally supported, and when the mold is released, the entire body is inclined so that the tapered portion of the lower divided body 13b becomes vertical, and the PC stairs 21 as a product is directly raised. Even if it is taken out, there is no part to be caught and it can be smoothly demolded.

When the PC stairs 21 having different floor heights are manufactured, by changing the overlapping portion of the upper divided body 13a and the lower divided body 13b and changing the height of the vertical kicking plate 13, the PC as a product can be obtained. Even with the same number of steps, the stairs 21 have different kicking heights of 3 and different overall floor heights can be obtained.

FIGS. 6 and 7 show a second embodiment of the present invention. As in the first embodiment, an elevating device 19 is provided for each step, and the height of the vertical vertical plate 13 for raising is increased step by step. Instead of setting, all the stages can be set at once with one lifting device.

A horizontal plate 14 for the tread which is integral with the upper divided body 13a.
A horizontal guide plate 24 is provided so as to project downward from the left and right side ends of the horizontal guide plate 24. One end of the horizontal guide plate 24 is pivotally supported on the gantry 7, and the other end is pin-connected to the jack 25 obliquely installed on the gantry 7. It is attached to the tilted table 26.

In this way, if the tilt angle of the tilt table 26 is changed by extending the jack 25, the horizontal guide plate 24 also moves up and down accordingly, and as a result, the tread horizontal plate is moved.
14 and the upper divided body 13a also move up and down, and the height of the vertical plate 13 for raising is changed in each step simultaneously and uniformly.

[0031]

As described above, the PC stair formwork apparatus of the present invention can produce many kinds of PC staircases having different floor heights by using only one formwork, which can rationalize the work and reduce the manufacturing cost. Can be realized.

Furthermore, the stairs to be manufactured have a beautiful finish that can be installed as a finished product without any modification after the mold is removed, which can streamline the work and reduce the manufacturing cost, and the depth of the tread is large. The stairs can be secured and a novel staircase can be obtained in terms of design.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of essential parts showing a first embodiment of a PC stair formwork device of the present invention.

FIG. 2 is a vertical cross-sectional side view of an essential part showing an elevating device in the first embodiment of the PC stair formwork device of the present invention.

FIG. 3 is a rear view of the main part showing the lifting device in the first embodiment of the PC stair formwork device of the present invention.

FIG. 4 is an overall side view showing a first embodiment of the PC stair formwork device of the present invention.

FIG. 5 is an overall side view of the first embodiment of the PC stair formwork device of the present invention during demolding.

FIG. 6 is an overall side view showing a second embodiment of the PC stair formwork device of the present invention.

FIG. 7 is an overall rear view showing a second embodiment of the PC stair formwork device of the present invention.

FIG. 8 is a side view showing an example of a PC staircase manufactured by the formwork apparatus of the present invention.

FIG. 9 is a vertical sectional side view showing a conventional example.

FIG. 10 is a plan view showing a conventional example.

[Explanation of symbols]

 1 ... Steel formwork 2 ... PC staircase 3 ... Kicking up 4 ... Tread 5 ... Kicking vertical plate 6 ... Treading horizontal plate 7 ... Stand 8 ... Recess 8a ... Landing site forming part 8b ... Stairway forming part 9 ... End plate 10 ... Bottom plate 11 ... Drain projection ridges 12 ... Side plate 13 ... Kicking up vertical plate 13a ... Upper divided body 13b ... Lower divided body 14 ... Tread horizontal plate 15 ... Side plate 16 ... Slit 17 ... Side plate 18 ... Bracket 19 ... Device 19a ... Nut 19b ... Bolt 20 ... Fixing base 21 ... PC stair 21a ... Landing part 21b ... Staircase part 22 ... Block 23 ... Non-slip material 24 ... Horizontal guide plate 25 ... Jack 26 ... Slope 27 ... Bolt 28 ... Bottom plate

Claims (1)

[Claims] 1. A PC staircase provided with a large number of combinations of vertical risers and horizontal treads to integrally form the riser and the tread at each step of a PC (precast concrete) stair to be produced. In the formwork device, the vertical kicking plate is vertically divided into a combination of an upper divided body and a lower divided body, and the upper divided body and the lower divided body are arranged such that the upper divided body is outside the lower divided body. The ends are slidably overlapped so that they overlap with each other, and the upper divided body is integrally provided as a front end extension of the tread horizontal plate, and the inside is made hollow to have a thickness. , The front side rises in a taper shape from the joining lower end to the lower divided body whose front surface is a vertical surface, and the upper part becomes a substantially vertical surface, and the corner part with the tread horizontal plate which is the upper end is rounded The feature is that it becomes a corner Formwork device for PC stairs.