JPH0455548A - Pc form benpable and manufacturing method thereof - Google Patents

Abstract

PURPOSE:To prevent water leakage in a bending section by providing a net- shaped reinforcement, notch forming face plates and water resisting elastic members to the bending section to form a PC form, and bending the form after the stripping to form the form which is an integral part of a structural body. CONSTITUTION:A net-shaped reinforcement 3, face plates 5 having a triangular section and water resisting elastic members 4 of rubber, etc., are provided along a bending line of a scheduled bending part, and concrete 7 is placed in a form 6 to form a PC form 1. Then, after the concrete 7 is solidified, the face plates 5 and form 6 are stripped, they are bent along notch sections 2 to form the form of a structural body. Concrete is placed in the form, and it is an integral part of the structural body as it is. According to the constitution, one-piece PC form capable of bending can be obtained.

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention forms a formwork for poured concrete in the construction of beams, columns, etc., and after the concrete hardens, it becomes an integrated structural frame and is removed from the mold. The present invention relates to a bendable PC formwork that is a so-called driving formwork that does not require a mold, and a method for manufacturing the same.

(Background of the invention) Traditionally, beams, columns, etc. were constructed by arranging reinforcement, attaching formwork plates around them, and pouring concrete into the formwork plates. However, since it is necessary to remove the formwork plates after the poured concrete has hardened, it is time-consuming and cumbersome, and the workability is poor.

For this reason, formwork members are pre-formed with concrete or the like to match the external shape of beams, columns, etc.
It is known that formwork is used to construct beams, columns, etc., and the construction is carried out in an integrated manner.This eliminates the need to remove formwork plates and streamlines construction, but The formwork had the following problems.

In other words, PC formwork for beams, columns, etc. generally has a substantially U-shaped cross section, and in this case, since the formwork has an upright part, it is difficult to pour concrete when manufacturing it. There is a risk that the filling may not be uniform, resulting in poor placement. On the other hand, pouring joints may cause variations in quality, and since it is a three-dimensional object with a roughly U-shaped cross section, it will be bulky to store and transport.Furthermore, when molding into thin walls, in addition to the above problems, There was also a risk of damage during demolding.

Therefore, the present applicant, for example,
10343 and Japanese Patent Application No. 2-110344, we proposed bendable PC formwork. In other words, the previous proposal has a linear notch on the surface of the PC board,
It can be bent along the notch. Therefore,
As the PC formwork is manufactured in the form of a flat plate, it is easy to place concrete, and since it is flat, it does not take up much bulk when stored or transported, and when actually used, it can be bent appropriately on site, etc. It is possible to improve the problems of

However, when such a material is bent along a straight notch, water stoppage along the bent part is incomplete, and even if this is used as a formwork for a katana or a pillar, there is no water inside. There was an inconvenience that the poured concrete and its water leaked.

The present invention has been made in view of the above-mentioned background, and aims to provide a bendable PC formwork that can prevent water leakage along the bending portion, and a method for manufacturing the same.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a PC board that is bendable along a linear notch provided on the surface of the PC board, at least at the notch portion. It is characterized by comprising a net embedded in the notch to form a reinforcing bar, and a water-resistant elastic member such as rubber placed in the notch and covering the surface layer thereof.

The manufacturing method involves setting rod-shaped temporary members at appropriate intervals within a flat plate formwork whose outer periphery is surrounded by side plates, and placing nets that serve as reinforcing bars on the surface of the temporary members. The method is characterized in that a water-resistant elastic member such as rubber is placed in advance, then concrete is poured into the formwork, and after the poured concrete has hardened, the temporary member and the formwork are removed from the mold.

In addition, the manufacturing method involves arranging rod-shaped members formed into a predetermined concave cross-section from a water-resistant elastic material such as rubber at appropriate intervals within a flat plate formwork whose outer periphery is surrounded by side plates, and reinforcing bars. The method is characterized in that a net is placed, then concrete is poured into the formwork, and the formwork is removed after the rod-shaped members and the poured concrete are fixed.

(Function) With the above structure, it can be bent along the notch. When bending along the notch, cracks or flakes occur in the concrete at that part, but the embedded net acts as a reinforcing hinge and does not result in cutting, allowing the concrete to be bent freely.

Here, if the notch is bent toward the side where the elastic member is provided, that is, if the elastic member covering the surface layer of the notch is bent inward, the elastic member will It forms a pressure contact on the inside and serves as a seal along the area.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a preferred embodiment of a bendable PC formwork according to the present invention, and FIG. 2 is a partial sectional view showing an enlarged main part thereof.

The figure shows the state after it has already been bent, and this PC
The formwork 1 is bendable along a linear notch 2 provided on the surface of the PC board, and is basically embedded in at least two notches to form reinforcing bars. Net 3 and
A water-resistant elastic member 4 such as rubber is disposed in the notch 2 and covers the surface thereof.

The cutout portion 2 is formed into a predetermined concave cross section as shown in FIGS. 3 and 4 showing the manufacturing state, that is, the state before bending, and in this example, it is formed into a substantially ■-shaped cross section. This molding is performed using a rod-shaped face piece 5 having a substantially triangular cross section as a mold.

Also, the mesh 3 may be a wire mesh, but it should have high strength and be lightweight.
It is preferable to use fibers made of glass fiber, carbon fiber, aramid fiber, etc. to prevent rust caused by insufficient cover thickness of concrete, and it is sufficient to bury them in at least two notches, but in this example, the fibers are buried in the entire surface of the PC board. Crossed over and buried.

FIG. 3 is a sectional view showing the PC formwork which is in the process of being manufactured and has not yet been removed from the mold, and FIG. 4 is a partial sectional view showing an enlarged main part thereof.

In manufacturing the PC formwork 1, first, the outer periphery of the bottom plate is surrounded by side plates to form a flat formwork 6, and within this formwork 6, a predetermined cross-sectional shape (in this example, a bar-shaped temporary member) is formed. The planks 5 (approximately triangular) are set at appropriate intervals, and the nets 3 forming reinforcing bars are placed. In this example, two mengi 5.5
are parallel to each other and are suspended over the upper part of the side plate of the formwork 6, and a notch 2 is formed on the upper surface of the PC formwork 1 that is molded within the formwork 6.
We are planning to form a Further, the net 3 is arranged in a wavy manner so that it is biased downward at the face wood 5 part and has an intermediate height at other parts.

At this time, a water-resistant elastic member 4 such as rubber is placed on the surface of each face piece 5, 5 in advance. This elastic member 4 has a face wood 5
It is shaped to fit the surface of the concrete, that is, it is formed linearly with a substantially square cross section, and it covers the surface layer of the poured concrete.

After the above-mentioned work, concrete 7 is poured into the formwork 6,
After the poured concrete 7 has hardened, the face timbers 5, 5 and the formwork 6 are removed from the mold.

As a result, a notch 2.2 is formed in the area where the two face pieces 5.5 have been removed, and a flat PC formwork 1 made of concrete 7 is completed.

This PC formwork 1 can be easily bent along the notches 2, 2. That is, when bending along the notch 2, although cracks and peeling occur in the concrete 7 at the relevant part, the buried net 3 acts as a reinforcing hinge, so the breakage does not occur and the concrete 7 can be bent freely. Here, if the notch part 2 is bent toward the casting side of the elastic member 4, as shown in FIG.
When the elastic member 4 is bent inwardly, the elastic member 4 is pressed against the inside of the bent portion, and serves as a seal along the bent portion. As a result, a so-called driven formwork having a substantially U-shaped cross section of the PCC formwork metal can be formed, and water leakage along the bent portion can be prevented.

Now, FIGS. 5 to 7 are partial cross-sectional views showing enlarged main parts of other embodiments of the present invention.

In manufacturing the PC formwork 1, the face wood 5, which is a bar-shaped temporary member, may be omitted, and the width of the elastic member 4 covering the surface layer of the notch portion 2 may be changed as appropriate. For example, as shown in FIG. 5, a water-resistant elastic member 40 such as rubber is formed into a predetermined concave cross section (in this embodiment, a substantially U-shaped cross section) and a rod-like member 40 is formed.
5, it may function as a mold for molding similarly to the face piece 5, and may also be used to cover the surface layer of the notch 2. In this case, the effort of demolding can be saved, and the rod-shaped member 45 can be used as a mold for forming the notch. Since the entire surface layer of 2 is covered, the width of pressure contact when folded can be increased, and a reduction in the water-stopping effect due to uneven pressure contact can be prevented.

Furthermore, the notch 2 may be formed on the lower surface of the PC formwork 1 as shown in FIG. 6, and the mesh 3 may be arranged in a thick part other than the notch 2 as shown in FIG. It can be changed as appropriate, such as by making it double.

(Effects of the Invention) As described above in detail in the examples, according to the bendable PC formwork and the manufacturing method thereof according to the present invention,
The PC formwork can be bent along the notch, and if the notch is bent to the side where the elastic member is placed, the elastic member will be pressed against the inside of the bent part, and the part will be bent. It serves as a stop along the road. Thereby, the PC formwork can be formed into a so-called driving formwork with a predetermined bending shape, and water leakage can be prevented along the bending part.

[Brief explanation of drawings]

Figure j11 is a cross-sectional view showing one embodiment of the present invention, Figure 2 is a partial cross-sectional view showing the main part of Figure 1, Figure 3 is a cross-sectional view showing a PC formwork in the process of being manufactured, and Figure 4 is a cross-sectional view showing the main part of Figure 1. FIG. 3 is a partial sectional view showing the main part, and FIGS. 5 to 7 are partial sectional views showing the main part of other embodiments.

Claims (3)

[Claims] (1) A device that can be bent along a linear notch provided on the surface of a PC board, and includes at least a net embedded in the notch to form a reinforcing bar, and a net disposed in the notch. A bendable PC formwork characterized by comprising a water-resistant elastic member such as rubber that covers at least a part of its surface layer. (2) Within a flat plate formwork whose outer periphery is surrounded by side plates, rod-shaped temporary members are set at appropriate intervals, and a net that serves as reinforcing bars is placed, and at this time, the surface of the temporary members is covered with rubber, etc. A bending method characterized by placing a water-resistant elastic member in advance, then pouring concrete into the formwork, and removing the temporary member and the formwork after the poured concrete has hardened. Possible method of manufacturing PC formwork. (3) Within a flat plate formwork whose outer periphery is surrounded by side plates, rod-shaped members made of a water-resistant elastic material such as rubber and formed into a predetermined concave cross section are arranged at appropriate intervals, and a net to form reinforcing bars is also arranged. A method for producing a bendable PC formwork, which comprises: then pouring concrete into the formwork, fixing the bar member and the cast concrete, and then removing the formwork.