JP2001129816A - Method and apparatus for manufacturing pc stairs - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing PC stairs for simply molding the PC stairs of different heights or lengths by using the same form. SOLUTION: The method for manufacturing PC stairs comprises the steps of arranging a plurality of stair molding elements 1 each having a tread face molding surface 1a and a rising face molding surface 1b so that the surface 2a and the surface 1b become substantially parallel to each other, rotating the elements 1 at substantially equal angle with respect to a rotary axis passing a predetermined point to meet the length and the height of the stair to be molded and then fixing them, disposing angle members 5 in gaps between the adjacent elements 1, arranging a width direction form 2 and an end member 3, and placing a concrete in a space surrounded by the arranged elements 1 and forms 2, 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step of a reinforced concrete structure preliminarily formed in a factory (PC in this specification).
More particularly, the present invention relates to a method and apparatus for manufacturing a PC staircase which can be formed by changing the height or length in accordance with the floor height of a building.

[0002]

2. Description of the Related Art In general, in a reinforced concrete building, a method of precasting a stair portion at a factory (referring to preforming before mounting on an actual construction site) and attaching a formed PC stair portion to the building is widely used. ing.

The conventional PC stairs usually consist only of stairs except for landings in order to match the elevators of the building to be actually mounted, and both ends of the stairs are connected at the site to the landings of the building.

FIG. 5 shows a state where the PC stairs are connected to a landing.

As shown in FIG. 5, according to this method, a formwork 20 is assembled on a landing portion of a staircase, and
Is supported by the support 22, and the reinforcing bars protruding from both ends of the precast PC stairs 23 are connected to the structural reinforcing bars 21 of the landing portion in a state where the PC steps 23 are inclined. Concrete was poured into the formwork 20 of the landing portion prepared in this way, and the PC stairs 23 and the landing portion were integrally connected also by concrete.

[0006] After the concrete is cast, the joint between the stair portion and the landing portion is polished, and the stair portion and the landing portion are completely integrated.

However, according to the above-mentioned method, the height of the PC stairs 2
3 is useful when it almost matches, but cannot be used when the floor height differs from the PC stairs 23 by a certain value or more.

On the other hand, the applicant of the present application has filed Japanese Patent Application No.
No. 79132 has developed a precast concrete stair forming apparatus that can be formed integrally with a landing and can change the height and length of a PC stair to be formed according to the required height and length.

FIG. 6 shows the PC step forming apparatus developed by the present applicant.

[0010] This PC step forming apparatus is basically a PC
It is possible to adjust the length and height (the difference between the heights of the landings) of the bed for forming the stairs (landing support portions 24, 26 and the stair support portion 25 for supporting the PC stairs to be formed), and to adjust the length to an appropriate length. A step-forming formwork 27 and a sasara formwork 28 are arranged on a bed adjusted to a height, and concrete is poured into a space surrounded by the step-forming formwork 27 and the sasara formwork 28. It was made.

[0011]

The PC stair forming apparatus previously developed by the applicant of the present invention can integrally form a landing and a stair portion corresponding to stairs of various heights and lengths. It was very effective in omitting the connection work between the landing and the stairs at the site.

However, the PC staircase forming apparatus was complicated and large. On the other hand, a simpler PC
There has been a demand for the development of a staircase manufacturing method or a PC staircase manufacturing apparatus.

Further, according to the PC stair forming device, the length and height of the bed portion (landing support portion and stair support portion for supporting the PC stair to be formed) can be adjusted.
Separate molds and step molds had to be manufactured separately to match the adjusted length and height.

For this reason, there is a demand to develop a PC staircase manufacturing method or a manufacturing apparatus capable of forming PC stairs having different heights or lengths by using the same step forming mold and sasara mold. Was.

The problem to be solved by the present invention is to provide a method for manufacturing a PC staircase capable of easily forming PC stairs having different heights or lengths by using the same step-forming mold and sasara mold. It is to provide the manufacturing apparatus.

[0016]

A PC according to claim 1 of the present application.
The staircase manufacturing method includes a step forming element having a tread forming surface and a rising surface forming surface for forming a tread surface and a rising surface per one step portion of a PC stair, wherein the tread forming surface and the rising forming surface are raised. A step of arranging a plurality of the step forming elements so that the tread forming surface and the rising forming surface are substantially parallel to each other;
C. According to the length and height of the stairs, rotate each of the stair forming elements by substantially the same angle about a rotation axis that is substantially parallel to the tread forming surface and the rising forming surface and that passes through a point separated by a predetermined distance therefrom. Fixing the step, arranging the corner members in the gaps between the tread forming surface and the rising forming surface of the adjacent stair form elements, and forming the arranged stairs at positions corresponding to both end surfaces in the width direction of the PC stairs. Arranging the width direction formwork at both ends of the element or at predetermined positions on the tread forming surface and the rising forming surface; and forming the arrayed stair forming elements at positions corresponding to both longitudinal end surfaces of the PC stairs. Arranging a longitudinal mold or end member at a predetermined position on both ends or a tread forming surface, and by arranging the arranged stair forming elements, the width mold and the longitudinal mold or end member; Enclosed space Is characterized in that concrete is cast on.

According to the PC staircase manufacturing method of the first aspect, by rotating and fixing each step forming element at a uniform angle, the tread surface and the rising surface of the step formed by each step forming element are in a parallel relationship. The depth and rise of the tread are changed while maintaining the height, thereby changing the length and height of the PC stairs to be formed.

Therefore, by rotating and fixing each step forming element at a predetermined angle in accordance with the length and height of the PC step to be formed, a PC step having a desired length and height within a certain range can be obtained. Can be.

The method for manufacturing a PC staircase according to claim 2 of the present application comprises:
2. The method for manufacturing a PC staircase according to claim 1, further comprising: a bottom mold for forming a bottom surface of the PC stair at a predetermined distance on the arranged stair forming elements; Concrete is poured into a space surrounded by a directional formwork and the lengthwise formwork or an end member and the bottom formwork.

According to the PC staircase manufacturing method of the second aspect, the bottom staircase forms the bottom surface of the PC staircase, whereby the PC staircase having a required thickness can be formed.

According to a third aspect of the present invention, there is provided a method for manufacturing a PC staircase.
3. The method according to claim 1, wherein each of the step forming elements is an independent forming element, and is arranged on a substantially horizontal bed, and a spacer is laid on a part of a bottom of the step forming element. Thus, each step forming element is fixed at substantially the same rotation angle.

According to the method for manufacturing a PC staircase according to the third aspect, by collecting independent staircase forming elements,
A mold for forming the step surface of the C step can be obtained. Therefore, a mold manufactured to a specific size is not required.
In addition, a required number of step forming elements can be collected according to a desired length to form a mold.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a PC staircase.
3. The method according to claim 1, wherein the step forming element is rotatably supported on a rotation axis that is substantially parallel to the tread forming surface and the rising forming surface and that passes through a point separated by a predetermined distance therefrom. Along with supporting the stair forming element at a position different from the support point of the rotating shaft so as to hold the stair forming element at a predetermined angle, a plurality of the supported stair forming elements are arranged at substantially equal intervals and in parallel, The stair forming elements supported at equal intervals and in parallel are connected to a link mechanism for rotating all the stair forming elements at substantially the same angle, and the link mechanism is adjusted to the length and height of the PC stair to be formed. To rotate each step forming element at substantially the same angle.

According to the PC staircase manufacturing method of the fourth aspect, the link mechanism can drive and fix each stair forming element at a uniform rotation angle. Thus, by operating the link mechanism, it is possible to obtain a mold for forming a PC stair having a desired length and height, similarly to the PC staircase manufacturing method according to the first aspect.

The PC staircase manufacturing apparatus according to claim 5 of the present application
A plurality of stair forming elements each having a tread forming surface and a rising surface forming surface for forming a tread surface and a rising surface per one step portion of the PC stairs, both ends of the stair forming element,
Alternatively, a width direction formwork disposed at a predetermined position on the tread forming surface and the rising forming surface of the stair forming element, and a predetermined shape on the tread forming surface of the stair forming element at both ends or both ends of the arrangement of the stair forming element. A longitudinal mold or end member disposed at a position, a rotation center axis disposed at substantially equal intervals and parallel to rotatably support the stair forming element, and holding the stair forming element at a predetermined angle. A bearing member for supporting the step forming element at a position different from the rotation center axis,
A link mechanism for connecting the plurality of rotation center shafts and the support member, and rotating the support members at substantially the same angle with respect to each rotation center axis by advancing and retreating the drive member.

According to the PC staircase manufacturing apparatus according to the fifth aspect, an arbitrary number of stair forming elements can be erected on the rotation center shaft and the support member. Further, the link mechanism can rotate and fix each step forming element at a uniform angle by driving the link mechanism. As a result, it is possible to obtain a molding die for molding a PC step having a desired length and height.

The PC staircase manufacturing apparatus according to claim 6 of the present application is
6. The PC staircase manufacturing apparatus according to claim 5, further comprising a driving device connected to the link mechanism and driving the driving member to rotate each bearing member at substantially the same angle with respect to each rotation center axis. Things.

According to the PC staircase manufacturing apparatus of the sixth aspect, the driving device rotationally drives each stair forming element to a predetermined angle and provides power for fixing. Thus, the step forming element can be rotationally fixed at a predetermined angle by mechanical power.

Further, at the time of removing the frame, each step forming element can be forcibly separated from the PC step at a time by driving the driving device.

The PC staircase manufacturing apparatus according to claim 6 of the present application is
7. The PC staircase manufacturing apparatus according to claim 6, wherein the PC staircase is connected to the driving device, and detects a driving amount of the driving device and outputs a corresponding PC staircase length or height, or a PC staircase length or height. And a control device for driving the drive device by a corresponding drive amount by inputting the input.

According to the PC staircase manufacturing apparatus of claim 7, the control device can convert the length and height of the PC stairs, the rotation angle of each step forming element, and the driving amount of the drive device of claim 6, In addition, the driving of the driving device can be controlled so as to obtain a predetermined driving amount.

Accordingly, by inputting a desired length or height, each step forming element can be rotationally fixed at a corresponding rotation angle.

Further, at the time of removing the frame, it is possible to forcibly separate each step forming element from the PC step by controlling the driving device.

[0034]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a state in which a mold is assembled in a state in which concrete can be poured in a method for manufacturing a PC staircase according to an embodiment of the present invention.

The formwork used in this embodiment includes a plurality of step forming elements 1, a pair of width direction forms 2 for forming both widthwise end faces of a PC step to be formed, and a PC to be formed. It is composed of a pair of end members 3 also serving as a formwork at both ends in the longitudinal direction of the stairs, and a bottom formwork 4 for forming the bottom surface of the PC stairs.

In addition, in the present embodiment, a corner member 5 disposed between each step forming element 1 is used. Also, a spacer 6 for inclining the stair forming element 1 at a predetermined angle.
Also use

The step forming element 1 is an element of a forming mold for forming a tread surface and a rising surface per step portion of a PC stair.

The step forming element 1 excluding both ends is a column-shaped forming form having a pentagonal cross section. Of the surfaces corresponding to the outer peripheral surface of the columnar body, two adjacent surfaces are:
It comprises a tread forming surface 1a and a rising surface forming surface 1b for forming a tread surface and a rising surface per step portion of a PC stair to be formed.

The step forming element 1 only needs to include the step forming surface 1a and the rising surface forming surface 1b, and the shape of the cross section is arbitrary.

The step forming elements 1 ', 1 "at both ends are forming form elements for forming landings at both ends of the PC stairs. The step forming elements 1', 1" are form elements for forming landings. For this reason, the tread forming surface 1a is compared with the other stair forming elements 1.
The part is wider. In addition, since the stair forming element 1 "at the upper end of the PC staircase is located at the upper end of the PC stair, it is not necessary to have the rising surface forming surface 1b.
Since the step forming element 1 "at the upper end of the C step can be replaced by the step forming element 1 having the wide tread forming surface 1a, in the claims of the present application, the term" step forming element "refers to the step forming elements 1 'at both ends of the PC step. , 1 "is also a" step forming element "
Shall be included. In the following description, unless otherwise specified, the step forming element 1 is a step forming element 1 ′,
1 ". The point that the cross-sectional shape of the step forming element 1 ', 1" is arbitrary is the same as that of the step forming element 1.

The width direction form 2 is a form for forming both end surfaces in the width direction of the PC stairs. As the width direction formwork 2 in the present embodiment, one that comes into contact with both end faces of the arranged step forming elements 1 is used. In this case, the width of the PC step to be formed corresponds to the width of the step forming element 1.

A PC step having a width smaller than the width of the step forming element 1 can be formed. The width direction form 2 in this case is
Use is made of a widthwise formwork 2 which is stepped and jagged in a stepwise manner, which is aligned with the upper surface of the step forming element 1 whose lower side is arranged.

The end member 3 is a member formed integrally with the PC step at both ends in the longitudinal direction of the PC step. End member 3
Is usually preformed with concrete of the same quality as the PC stairs. The end member 3 also serves as a formwork (longitudinal formwork) to be disposed at both ends of the PC stairs in the longitudinal direction, and forms the PC stairs by blocking the concrete in a fluid state to be poured. Perform the function of Therefore, it goes without saying that the longitudinal direction formwork can be used instead of using the end member 3.

The bottom form 4 is a form for forming the bottom of the PC stairs. The bottom formwork 4 serves to prevent the PC stairs from becoming unnecessarily thick and to form the undulations, inclinations, etc. of the top surface of the cast concrete when the PC stairs are integrally molded. The bottom mold 4 shown in FIG. 1 is a horizontal part 4 for forming the central part of the PC stairs.
a and an inclined portion which forms a landing at both ends of the PC stairs.

However, in the case where the upper surface of the cast concrete where only the stairs except the landing is cast may be horizontal, the bottom form 4 can be omitted.

The corner member 5 is a member to be a corner of each step of the PC stairs. The corner member 5 is disposed between the tread forming surface 1a and the rising surface forming surface 1b of the adjacent stair forming element 1, and is formed integrally with the PC stair by casting concrete. The corner member 5 is usually formed in advance of concrete of the same quality as the PC stairs, and is formed into an elaborate shape such as providing a non-slip groove. The reason for requiring the corner member 5 will be described later.

The spacer 6 is provided under the step forming element 1 to adjust and hold the inclination angle of the step forming element 1. The material, shape, and the like of the spacer 6 are arbitrary as long as the above function is achieved.

The steps of forming the PC steps using the above-described molds and members are performed as follows.

First, the step forming element 1 is moved to the tread forming surface 1.
a and the rising surface forming surface 1b are arranged upward, and as shown in FIG. 1, a plurality of the step forming elements are arranged such that the tread forming surface and the rising forming surface are substantially parallel to each other.

Next, according to the length and height of the PC step to be formed, the tread forming surface 1a and the rising forming surface 1a are formed.
Each staircase forming element 1 is rotated by an approximately equal angle about an axis of rotation substantially parallel to b and passing through a point at a predetermined distance therefrom, and a spacer 6 is laid to fix the staircase forming element 1 at that rotation angle.

Here, the rotation axis passes through a point at which the parallel relationship between the tread forming surface 1a and the rising surface forming surface 1b of each step forming element 1 does not change by rotating by the same angle. As described above, such a rotation axis is substantially parallel to the tread forming surface 1a and the rising forming surface 1b, and is located at a certain distance from the tread forming surface 1a and the rising forming surface 1b for each step forming element 1. Can be defined as an axis through

In the embodiment shown in FIG. 1, for the step forming elements 1 in the central portion excluding both ends, one ridge line on the lower surface of each step forming element 1 coincides with the rotation axis. Thus, if the lower surface is inclined at the same angle with one ridge line of the lower surface of each step forming element 1 as a fulcrum, the tread surface forming surface 1 of each step forming element 1 is formed.
a and the rising surface forming surface 1b are also inclined at the same angle while maintaining the parallel relationship.

Next, the corner member 5 is arranged in a gap between the tread forming surface 1a and the rising forming surface 1b of the adjacent step form element 1. The corner members 5 are arranged because rotating the staircase forming element 1 creates a gap between the tread forming surface 1a and the rising forming surface 1b of the adjacent stair formwork element 1. This will be further described below.

Next, the widthwise formwork 2 is attached to both ends of the staircase forming elements arranged at positions corresponding to both widthwise end faces of the PC staircase.
Is arranged.

Here, P is narrower than the width of the step forming element 1.
In the case of forming the C staircase, as described above, the staircase forming element 1 in which the lower side is arranged with the widthwise formwork 2 having a slab shape is arranged at a predetermined position on the tread surface forming surface 1a and the rising forming surface 1b. I just need.

Next, the tread forming surface 1a of the stair forming element 1 ', 1 "at a position corresponding to both end surfaces in the length direction of the PC stairs.
The end member 3 is disposed at a predetermined upper position.

Finally, it is arranged at a predetermined distance on the stair forming element 1 on which the bottom molds 4 are arranged.

Concrete is poured into a space surrounded by the step forming element 1, the width direction form 2, the end member 3, and the bottom form 4 constructed as described above.

After the concrete has been cast, the concrete is cured and left to stand until it exhibits a predetermined strength.
After the concrete hardens and exhibits a predetermined strength, the molded PC steps can be obtained by disassembling the mold. Note that the molded PC staircase is completed in a state in which the PC step is upside down from the state normally used.

Next, the operation and effect of the PC staircase manufacturing method according to the present invention will be described.

First, in the PC staircase manufacturing method,
"Rotating the staircase forming element 1 by a predetermined angle with respect to the rotation axis in accordance with the length and height of the PC staircase to be formed" will be described with reference to FIGS.

FIG. 2 shows a case where the step forming element 1 is rotated by + 5 °.

FIG. 2A shows the step forming element 1 of FIG. 1 viewed from the lateral direction. The step forming element 1 that does not rotate is indicated by a virtual line (two-dot chain line), and the rotation axis is The step forming element 1 rotated + 5 ° in the counterclockwise direction with respect to is shown by a solid line.

FIG. 2 (b) shows the length L and height H of the PC staircase in the case of non-rotation with phantom lines.
The length L and height H of the PC staircase when rotated by 5 ° are indicated by solid lines.

As described above, since the PC step to be formed is formed upside down from the use state, the PC step is formed as shown in FIG.
2A correspond to each other, the points A and A 'and the points B and B' and the points A and A 'and the points B and B' in FIG.
In (b), the position is inverted.

Points A and A ′ indicate predetermined points on the landing at the lower end of the PC staircase when the stair forming element 1 is not rotated and when it is rotated + 5 °, respectively, and points B and B ′ are respectively The predetermined point on the landing at the upper end of the PC staircase is shown when the staircase forming element 1 is not rotated and when the staircase forming element 1 is rotated by + 5 °.

In order to compare the length L and the height H of the PC stairs, the points A and A 'in FIG.
And B ′.

As shown in FIG. 2A, when each step forming element 1 is rotated counterclockwise by + 5 ° about the rotation axis,
The tread forming surface 1a and the rising surface forming surface 1b of each step forming element 1 rotate while maintaining the parallel relation, and at the same time,
The depth dimension d of the tread surface of each step of the stairs decreases, and the rise dimension g increases.

Further, a reduction in the depth dimension d of the tread surface of the stairs,
With an increase in the rise size g, a gap is formed between the tread forming surface 1a and the rising surface forming surface 1b of the adjacent step forming element 1. This gap is supplemented by the corner member 5. In addition,
The gap in this case is mainly due to the increase in the rise size g.

As a result, the predetermined point B ′ at the upper end of the PC staircase to be formed is, as shown in FIG.
The length is reduced by ΔL and the height is increased by ΔH as compared with the predetermined point B at the upper end of the PC staircase when is not rotated.

FIG. 3 shows a case where the step forming element 1 is rotated by -5 °.

FIG. 3 (a) shows the step forming element 1 of FIG. 1 viewed from the lateral direction. The step forming element 1 that does not rotate is indicated by a virtual line (two-dot chain line), and the rotation axis is centered. The step forming element 1 rotated by -5 ° with the counterclockwise direction being positive is shown by a solid line. For the sign, the staircase forming element 1 is -5 °
It is the same as FIG. 2 except that the start point and end point of the PC staircase when rotated are A "and B", respectively.

Each step forming element 1 is shifted by -5 ° around the rotation axis.
When rotated, the tread forming surface 1a and the rising surface forming surface 1b of each stair forming element 1 rotate while maintaining the parallel relation, and at the same time, the depth dimension d of the tread of each step of the stairs increases, and The dimension g decreases.

With the increase in the depth d of the tread surface of the stairs,
A gap is formed between the tread forming surface 1a and the rising surface forming surface 1b of the adjacent step forming element 1, and this gap is supplemented by the corner member 5.

As a result, the predetermined point B ″ at the upper end of the PC staircase to be formed is, as shown in FIG.
Is increased by ΔL and decreased by ΔH as compared with the predetermined point B at the upper end of the PC staircase when is not rotated.

As described above, according to the PC staircase manufacturing method of the present invention, only by rotating the staircase forming element 1 by a predetermined angle,
The length L and height H of the PC steps can be adjusted. Moreover, in the PC staircase manufacturing method of the present invention, since the number of staircase forming elements 1 to be arranged can be freely increased or decreased, it is possible to cope with a large change in the length L or the height H.

Therefore, by combining the increase and decrease in the number of the step forming elements 1 and the rotation of the step forming elements 1, PC steps having various lengths L and heights H can be formed in a wide range.

Further, according to the PC staircase manufacturing method of the present invention, even if the length L and height H of the PC staircase are changed, the angle and the parallel relationship between the tread surface and the rising surface of the staircase are maintained. This makes it possible to form a PC stair that is easy to use at all times without having an unnatural step-shaped PC stair.

Further, according to the method for manufacturing a PC staircase of the present invention, since the corner member 5 having an elaborate shape can be formed in advance,
It is possible to mold the corners of the stairs, which were difficult to mold in the past, with high quality. In addition, the use of the corner member 5, combined with the fact that the mold is easily disassembled according to the PC staircase manufacturing method of the present invention, makes it possible to remove the corners of the stairs that are liable to be broken when the mold is taken out from the mold after molding. High quality PC stairs can be formed with less damage.

Further, in the method for manufacturing a PC staircase of the present invention,
Variable length and variable height PC stairs can be formed with the minimum required formwork, and the same formwork can be used for forming PC stairs of various dimensions, so materials and equipment can be minimized. It is.

The preceding is an explanation of the PC staircase manufacturing method of the present invention. The PC staircase manufacturing method of the present invention described above
Since an essential part of the present invention, namely the method of rotating the stair forming element to change the length L and the height H of the PC stairs, the method can be carried out in various ways. .

The simplest method of carrying out the PC staircase manufacturing method of the present invention is to arrange a plurality of stair forming elements on a substantially horizontal bed (a table for precasting a concrete member) and adjust the angle of the stair forming elements by spacers. And then cast concrete.

However, the applicant of the present invention has devised a PC staircase manufacturing apparatus which can more easily execute the PC staircase manufacturing method of the present invention, and this will be described below.

FIG. 4 shows an embodiment of the PC staircase manufacturing apparatus of the present invention.

In FIG. 4, a PC staircase manufacturing apparatus 7 generally indicated by reference numeral 7 rotatably supports a plurality of staircase forming elements 1, a width direction formwork 2, an end member 3, and a staircase forming element 1. A rotation center shaft 8, a support member 9 that supports the step forming element 1 at a position different from the rotation center shaft 8, a rotation drive member 10 that rotates the support member 9 about the rotation center shaft 8,
A driving member 11 that drives the plurality of rotation driving members 10 to make the rotation angles equal, a driving device 12 that drives the driving member 11, and a control device 13 that controls the movement of the driving device 12.
And The configuration including the rotary drive member 10 and the drive member 11 is referred to as a link mechanism 14 of the PC staircase manufacturing apparatus 7.

Step forming element 1, width direction form 2, and end member 3
Is the same as that of FIG. 1, and the duplicate description is omitted here.

The rotation center shaft 8 is a member that supports the stair forming element 1 at a position that coincides with the rotation axis of the stair forming element 1 described in the above-described PC staircase manufacturing method.

A plurality of rotation center shafts 8 are arranged on the link mechanism 14 at substantially equal intervals and in parallel so as to support the plurality of step forming elements 1. The link mechanism 14 that supports the rotation center shaft 8 is supported by a pedestal (not shown).

The bearing member 9 is a member for supporting the step forming element 1 at a position different from the rotation center axis 8 in order to hold the step forming element 1 at a predetermined angle. A plurality of support members 9 are also arranged on the link mechanism 14 at substantially equal intervals and in parallel.
The bearing member 9 need not be a shaft as shown as long as it can support the step forming element 1.

The rotation center shaft 8 and the support member 9 form a pair, and the pair of rotation center shaft 8 and the support member 9 are provided with one step forming element 1.
Is constructed. The step forming element 1, the rotation center shaft 8 and the support member 9 are configured to be detachable. The detachable configuration means that the stair forming element 1 is provided with a recess for bearing, and the recess for bearing is formed by the rotation center shaft 8.
And the support member 9 may be engaged, or the rotation center shaft 8 or the support member 9 itself may be detached from the link mechanism 14.

The rotation drive member 10 is a component of the link mechanism 14 and is a member that converts the linear motion of the drive member 11 into rotation of the rotation center shaft 8 and the support member 9 and transmits the rotation.
In FIG. 4, the rotary drive member 10 is a triangular member, but may be any member as long as it converts the linear motion of the drive member 11 into rotation of the rotary drive member 10.

The driving member 11 connects the respective rotary driving members 10, uniformly restricts the rotation angles of the respective rotary driving members 10, and drives the respective rotary driving members 10 to rotate at the same rotation angle by linear motion. It is.

The driving device 12 is a power device for driving the driving member 11. The drive device 12 may be either hydraulic or electric. In addition, the driving device 12 can be provided if necessary, and can be omitted when it is not necessary to drive by power.

The control device 13 has therein a correspondence table of the number and rotation angle of the staircase forming elements 1 and the length L and height H of the PC staircase.
Outputs the length L or height H of the C step, or conversely,
This is a device that drives and controls the driving device 12 by a corresponding driving amount by inputting the length L or height H of the PC stairs. The control device 13 can be omitted if necessary.

When the PC staircase manufacturing apparatus 7 is to form a PC staircase having a predetermined length L and height H, the staircase forming element 1 is adjusted so as to be in a range that can be adjusted by the rotation angle of the staircase forming element 1. Adjust the number. As described above, since the step forming element 1 is detachable, the required number of step forming elements 1 are mounted on the rotation center shaft 8 and the support member 9 on the link mechanism 14.

Next, the necessary length L or height H of the PC stairs is input to the control device 13.

The control device 13 converts the input length L or height H of the PC stairs into the rotation angle of the stair forming element 1 and further converts the rotation angle of the stair forming element 1 into the driving device 1.
Then, the driving device 12 is controlled to drive the driving device 12 so as to obtain the calculated driving amount.

Under the control of the control device 13, after the drive device 12 drives each step forming element 1 to rotate at the same angle via the link mechanism 14, the width direction form 2, the end member 3, and the bottom form 4 And a corner member 5 are arranged, a formwork for PC stair molding is assembled, and concrete is poured into an internal space surrounded by the formwork.

When the poured concrete has hardened and can exhibit a predetermined strength, the width direction form 2, the end member 3, and the bottom form 4 are removed, and the drive unit 12 forcibly forces the stair forming element. 1 is driven to rotate by a predetermined angle. As a result, the gap between each step forming element 1 and the PC step is forcibly peeled off, and the PC step can be lowered very easily from the PC step manufacturing apparatus 7.

According to the PC staircase manufacturing apparatus 7, the labor and time for individually rotating and fixing the individual staircase forming elements 1 at the same angle are omitted, and the drive unit 12 equalizes each staircase forming element 1 at a time. Rotation can be fixed at an angle.

Furthermore, by using the control device 13, it is not necessary to calculate the rotation angle of the stair forming element 1 every time in order to obtain the desired length L and height H of the PC stairs. By inputting the length L and the height H of the stairs, the rotation angle of the staircase forming element 1 corresponding thereto is automatically calculated, and further, the driving device 1 is set so as to obtain the rotation angle.
2 can be drive-controlled.

Further, after the PC stairs are hardened on the PC staircase manufacturing apparatus 7, each of the staircase forming elements 1 is driven by the drive unit 12.
Forcibly rotates the step forming element 1 and P
There is a gap between the steps C, and the work of removing the frame can be completed at once. This greatly simplifies the work after molding.

[0104]

As is apparent from the above description, according to the method and the apparatus for manufacturing a PC staircase of the present invention, the same staircase forming element is rotated and fixed at various angles to obtain various sizes. A formwork for forming the PC steps can be configured.

Further, the same step forming element, widthwise formwork, end member and bottom formwork can be used repeatedly, so that the labor for manufacturing the formwork can be saved.

In addition, an elaborately shaped square member is formed in advance,
Since this is formed integrally with the PC stairs, the possibility of damaging the corners of the stairs when unframed is reduced, and it is possible to provide a PC staircase manufacturing method and a manufacturing apparatus capable of forming the corners of the stairs into an elaborate shape. it can.

Further, the PC steps can be formed with a simple apparatus, and the capital investment can be reduced.

Further, according to the PC staircase manufacturing apparatus to which the driving device is connected, the PC staircase manufacturing device can exhibit each of the above-mentioned effects, and after the PC stair is hardened to have a predetermined strength, the driving device is connected to the PC staircase manufacturing device. By operating, each step forming element can be forcibly separated from the PC step, and the work of removing the frame is made much more efficient.

According to the PC staircase manufacturing apparatus to which the control device is connected, by inputting the desired length and height,
It is converted into the rotation angle of the step forming element, and the driving device is controlled to immediately rotate and fix each step forming element at the angle. Thereby, the work of calculating the rotation angle and individually adjusting and fixing each step forming element with a spacer or the like can be omitted, and the working efficiency can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a mold for forming a PC stair is assembled by a method for manufacturing a PC stair according to the present invention.

FIG. 2 is a diagram illustrating changes in the length L and height H of a PC staircase when the staircase forming element is rotated + 5 ° with the counterclockwise direction being positive.

FIG. 3 is a diagram illustrating changes in the length L and height H of a PC staircase when the staircase forming element is rotated by -5 ° with respect to a counterclockwise direction being positive.

FIG. 4 is a perspective view showing one embodiment of a PC staircase manufacturing apparatus of the present invention.

FIG. 5 is an explanatory diagram showing a state where a conventional PC staircase is connected to a landing portion.

FIG. 6 is a perspective view showing a PC staircase forming device developed earlier by the present applicant.

[Explanation of symbols]

 Reference Signs List 1 stair forming element 1a tread forming surface 1b rising surface forming surface 2 width direction form 3 end member 4 bottom form 5 square member 6 spacer 7 PC staircase manufacturing device 8 rotation center shaft 9 support member 10 rotation drive member 11 drive member 12 drive device 13 control device 14 link mechanism

Claims (7)

[Claims] 1. A stair forming element having a tread forming surface and a rising surface forming surface for forming a tread surface and a rising surface per step portion of a PC stair, wherein the tread forming surface and the rising forming surface are raised. A step of arranging a plurality of the stair forming elements so that the tread forming surface and the rising forming surface are substantially parallel to each other, and in accordance with the length and height of the PC stair to be formed, A step of rotating and rotating each of the stair forming elements by substantially the same angle with respect to a rotation axis passing through a point substantially parallel to the tread forming surface and the rising forming surface and at a predetermined distance therefrom; Arranging a corner member in a gap between a tread forming surface and an upright forming surface of the element; and both ends of the stair forming element arranged at positions corresponding to both end surfaces in the width direction of the PC stair, or a tread forming surface and a vertical surface. Arranging the width direction formwork at a predetermined position on the beam forming surface, and a predetermined position on both ends of the arrayed stair forming elements or a tread surface forming surface at a position corresponding to both longitudinal end surfaces of the PC stairs. Arranging a longitudinal form or an end member in the space, and placing concrete in a space surrounded by the arranged step forming elements, the width form and the longitudinal form or the end member. A method of manufacturing a PC staircase. 2. A bottom form for forming a bottom surface of a PC stair at a predetermined distance on the arranged stair forming elements, wherein the arranged stair forming elements, the width direction form and the length are arranged. 2. The method according to claim 1, wherein concrete is poured into a space surrounded by the vertical form or end member and the bottom form. 3. Each of the step forming elements is an independent forming element, and is arranged on a substantially horizontal bed, and a spacer is laid on a part of a bottom of the step forming element to form each step forming element. 3. The method for manufacturing a PC staircase according to claim 1, wherein the rotation angles are fixed at equal angles. 4. The step forming element is rotatably supported on a rotation axis passing through a point substantially parallel to the tread forming surface and the rising forming surface and passing a predetermined distance therefrom,
Supporting the stair forming element at a position different from the support point of the rotating shaft so as to hold the stair forming element at a predetermined angle; arranging a plurality of the supported stair forming elements in parallel at substantially equal intervals; The stair forming elements supported in parallel and at intervals are connected to a link mechanism that rotationally drives all the stair forming elements at substantially the same angle, and the link mechanism is driven according to the length and height of the PC stair to be formed. 3. The method for manufacturing a PC staircase according to claim 1, wherein each of the step forming elements is driven to rotate at substantially the same angle. 5. A plurality of stair forming elements each having a tread forming surface and a rising surface forming surface for forming a tread surface and a rising surface per one step portion of the PC stair, and both ends of the stair forming element, or A width direction formwork disposed at a predetermined position on the tread forming surface and the rising forming surface of the stair forming element; and a predetermined position on the tread forming surface of the stair forming element at both ends or both ends of the arrangement of the stair forming element. A longitudinal formwork or end member disposed on the staircase-forming element; a rotation center shaft disposed at substantially equal intervals and in parallel to rotatably support the step-forming element; and for holding the step-forming element at a predetermined angle. A supporting member for supporting the stair forming element at a position different from the rotation center axis, connecting the plurality of rotation center axes and the support member, and moving each support member with respect to each rotation center axis by advancing and retreating the driving member. PC stairway manufacturing apparatus characterized by comprising a link mechanism for rotating crucible at equal angles, the. 6. A driving device according to claim 5, further comprising a driving device connected to said link mechanism, said driving device driving said driving member to rotate each bearing member at substantially the same angle with respect to each rotation center axis. PC staircase manufacturing equipment. 7. By connecting to the driving device, detecting the driving amount of the driving device and outputting the length or height of the corresponding PC stair, or inputting the length or height of the PC stair. 7. The PC according to claim 6, further comprising a control device that drives the driving device by a corresponding driving amount.
Stair manufacturing equipment.