JPH0462522B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a method for manufacturing a PC plate by on-site production.

``Conventional technology'' In the current slab construction method, it is common to use semi-PC slabs as waste formwork and omit formwork and shoring.

As for the above-mentioned half-PC version, it is well known that there is a factory-produced assembly reinforcing steel, but this version has the following drawbacks.

In other words, because special reinforcing bars are used, this does not lead to cost reduction. Furthermore, transportation costs from the factory to the site increase costs, and there is an upper limit to the size that can be manufactured. Therefore, it is necessary to divide the floor slab into several pieces per span, and inevitably joint joint treatment is required in order to use it as a direct ceiling.

Furthermore, since the upper half of the assembly reinforcing bars are exposed on the top surface, it is not possible to stack them up using them as underlays.
One bed is required for each PC version,
A production yard with a large area is required, and in order to secure the required number of sheets, early demolding by steam curing must be performed. All of these are factors that increase costs.

Therefore, in recent years, structures that do not require reinforced reinforced steel protruding from the top surface have been adopted.
With this type, 1. Since both the top and bottom surfaces are flat, it can be manufactured in piles on site, and the production yard and number of beds can be reduced to 1/5 to 1/10 of the assembled reinforced version. or,
Since early demolding is not performed, special production equipment for steam training is not required.

2. Reinforcing bars are easy to construct and inexpensive because they use conventional reinforcing bars.

3. Because it is produced on-site, there is no need for transportation by vehicle, and it can be made larger.

Also, since it is a PC version with one piece per span, joints can be prevented from appearing.

You can enjoy the following advantages.

Conventionally, there is a method proposed in Japanese Patent Application Laid-open No. 14715/1983 as a procedure for stacking and manufacturing at the site mentioned above.

The key point is that the first
A release plate is laid on top of the PC plate, and then the lower part of the peripheral formwork, which has a height approximately twice the thickness of the PC plate, is screwed into the insert metal fittings with bolts. At the same time as fixing it to the peripheral side, insert hardware is fixed to the upper inner surface of the above peripheral formwork with bolts, and concrete is poured into the above peripheral formwork to form the second PC plate. After forming, each of the above Remove the bolts and remove the peripheral formwork from the first
After separating from the PC plate and the second PC plate, a release plate was placed on the second PC plate, and then a bolt was screwed into the metal insert buried in the second PC plate. The lower part of the peripheral formwork is fixed to the peripheral side of the PC plate of the lever, insert hardware is attached to the inner surface of the peripheral formwork with bolts, and concrete is poured into the peripheral formwork.

``Problems to be solved by the invention'' However, there are the following disadvantages in the presentation method.

In other words, in actual construction, the span of the slab cross deck is not constant on the upper and lower floors, but increases (approximately 5 cm) as the beam width decreases as you move up the floor.
However, according to the presentation guidelines, the peripheral formwork of the higher PC version is set to be the same size as the lower PC version, so
It is impossible to build up PC plates with different span sizes, and it is not possible to accommodate the actual situation at the construction site, so it is necessary to secure separate space and manufacture each floor separately.

``Means for Solving Problems'' and ``Operations'' The present invention was made in view of the above-mentioned circumstances, and its gist is that buckling-reinforced shaped steel such as C-chan is hinged at the corner. Alternatively, a vinyl sheet with a cushion for peeling is placed on the first PC plate, which has metal inserts for shear bolts embedded in the top surface formed in the construction bed on-site using surrounding formwork connected with hooks. After laying the floor sheet, the surrounding formwork is stacked using an adjuster, which is made by assembling long bolts erected on the construction bed to brackets with nuts protruding from the outer periphery of the frame. Set to production level and start the first PC
Repeat molding the second PC version in the same way as the version,
When molding a piece with a larger span size than in the middle, plywood is laid on the preceding PC plate as the underlay, a formwork of the span size is set up, the plywood is used as a bed, and the molding is carried out, and the above-mentioned adjuster is used thereafter. Assuming that stacking production will be carried out in the same manner as above, there will be no advance notice in stacking production.
The following PC version, which has a larger span than the PC version, can be manufactured by stacking it on top of the preceding PC version, thereby eliminating the need to secure a molding space for each floor.

"Example" This will be explained in detail below based on the figures.

FIG. 1 shows an embodiment of the method of the present invention, and FIGS. 2 to 4 are detailed views of the area surrounded by lines in FIG. 1.

In the figure, 1 indicates a large drawer made of H steel, etc., 2 indicates a joist mounted on the above-mentioned large puller, 3 indicates a construction bed placed on the above-mentioned joist 2, and 4a indicates a molding in advance on the above construction bed 3. The first PC plates 4b and 4c produced are stacked on top of the PC plate 4a, and in the illustrated example, 4a to 4c have the same span size.

The peripheral formwork 5 for forming these PC plates surrounds a buckling-reinforced type steel 5a such as a C-chan, and is secured at the corner with a wedge 5b as shown in Fig. 1 or as shown in Fig. 3. Connect at hinge 5c.

Although not shown in the drawings, reinforcing is arranged during molding, and the insert hardware for the shear bolt, which is also used for lifting and moving, is pre-attached to the lower end reinforcement spacer, and furthermore, when stacking and manufacturing, it is peeled off on the preceding PC plate. Lay a vinyl floor sheet with cushions (commercially available) for this purpose.

The cushioned vinyl floor sheet has moderate hardness and a cushion layer on the back side, so
The cushion layer absorbs the rough surface of the lower PC plate and the dents caused by the sheath roller, etc., while giving the surface a smooth, high-precision hammered finish, which can significantly reduce the cost of finishing work, and can be rolled up when not in use. It is more suitable than plywood because it can be stored easily, does not take up much space, has good peelability, and does not lose surface precision even after repeated use.

In stacking production, the peripheral formwork 5 must be fixed at that level, but in the present invention this is done in the following manner.

That is, a level adjuster is assembled by assembling a long bolt 9 with a bolt 8 standing on the construction bed 3 to a bracket 7 with a nut 6 protruding from the outer periphery of the formwork 5, and turning the handle 10 at the top of the bolt 9. The peripheral formwork 5 is fixed at a predetermined level by dynamic operation.

In addition, in Fig. 2, 7a shows the reinforcing plate of the bracket 7, and in Fig. 4, the peripheral formwork 5 and the tonnage 8 are integrated, and the formwork is left for fixing the preceding PC plate 4a. Give an example.

According to the method described above, fixation at a predetermined level can be achieved extremely quickly by rotating the long bolt 9, which greatly saves time and effort.

When manufacturing PC plates with the same span size, it is sufficient to lift the peripheral formwork used for the preceding PC plate, but if the span size increases, the peripheral formwork must be replaced.

At that time, there will be protruding parts, so for the first PC version that will be changing, a plywood board large enough to cover it will be laid and molded.

After the transition, the stacking process is carried out in the same way as described above, after changing the position of the azimuth star.

Therefore, if the span size of the succeeding PC version and the preceding PC version are different, stacking production can be performed (in the above example, the higher one has a large span, but the reverse is also possible). Bracket 7
This is possible by setting the protrusion amount to a predetermined length).

"Effects of the Invention" As described above, according to the method of the present invention, it is possible to stack and manufacture PC plates with different span sizes compared to conventional means, so it does not take up much space, and the handling of release material is easy. , which is advantageous in terms of surface finishing, etc.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the method of the present invention, and FIGS. 2 to 4 are detailed views of the area surrounded by lines in FIG. 1. 1... Ohiki, 2... Joist, 3... Betsudo, 4
a, 4b, 4c...PC version, 5...peripheral formwork, 5
a...Shape steel, 5b...Wedge, 5c...Hinge, 6
... Nut, 7 ... Bracket, 7a ... Reinforcement plate, 8 ... With tons, 9 ... Long bolt, 10
……handle.

Claims (1)

[Claims] 1 Using a peripheral formwork made up of buckling-reinforced shaped steel such as C chain connected at the corners with hinges or wedges, insert metal fittings for shear bolts are buried in the upper surface formed in the construction bed on site. A vinyl floor sheet with a cushion is laid down for peeling on the first PC plate, and then the surrounding form is erected on the construction bed using a bracket with nuts protruding from the outer periphery of the frame. Using the adjuster star assembled with the long bolts of the set, set it to the stacked production level and make the second PC version in the same way as the first PC version.
Repeat the molding of the PC plate, and when molding a larger span size, lay plywood on the preceding PC plate as the base, set up a formwork of the span size, and use the plywood as the bed. A method for manufacturing a PC plate by on-site production, characterized in that the above-mentioned adjusting star is used to carry out stacking and production in the same manner as described above.