JPS6328604A - Cotter forming method in pc board and formwork for cotter formation - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for forming a turret on the surface of precast concrete (PC) during temporary production, and a formwork for forming the turret that is applied to this method. It is.

"Conventional technology" Generally, in construction work that uses a large amount of PC boards, the necessary PC
By manufacturing the boards at the construction site, the cost required for temporarily transporting PCs is reduced.

By the way, it is necessary to provide a recess called a cotter on the temporary surface of the PC board, which is used for attaching the PC board, etc. When forming this cotter on the surface of the PC board, conventionally, the following method has been used: Methods such as this have been applied.

That is, as shown in FIG. 5, after concrete 2 is placed in a formwork 1, a roller 4 having a large number of protrusions 3 on the outer peripheral surface is transferred to the surface of the concrete 2 to form a concrete 2. Alternatively, as shown in FIG. 6, a supporting member 6 is provided at the upper end of the formwork l, and a plate-shaped cotter forming formwork 7 is supported in a suspended state by this support member 6, and then attached to the formwork l. There is a method of pouring concrete 2.

"Problems to be Solved by the Invention" However, in the former method, the rollers 4 are moved manually onto the uncured concrete, so the depth, pitch, etc. of the formed rollers 5 are not correct. Uniformity is inevitable.

In addition, in the latter method, since the plate-shaped caster forming formwork 7 is present on the concrete 2, air bubbles generated when the air contained in the poured concrete 2 is released are removed. There is a problem that it accumulates on the lower surface of the formwork 7.

The present invention has been devised in view of the above circumstances, and provides a method for forming a cotter that can form a cotter with high precision and does not generate air bubbles during the formation of a cotter, and a method for forming a cotter that is applied to this method. The purpose is to provide formwork.

"Means for Solving the Problems" In order to achieve the above object, the present invention provides a formwork that presses the surface of concrete to form a concrete caster before the concrete poured in the formwork hardens. is placed on the concrete, and as the formwork, a large number of cotter molds having external shapes corresponding to the cotters to be formed, and the plurality of cotter molds are placed at mutual intervals corresponding to the pitch of the cotters and on the same plane. We decided to use a structure consisting of a connecting frame that is connected together in a state where they are arranged on top of each other.

"Effect" When the above method and formwork are adopted, the concrete is pressed against the mold for forming a cotter after the air contained in the concrete is released, which prevents the generation of air bubbles, and also prevents the formation of the cotter mold. Since they are interconnected at intervals and integrated, a cotter of precise pitch and depth can be formed.

"Example" Hereinafter, the present invention will be described in detail with reference to the drawings.

First, an example of the mold 8 for forming a cotter will be explained with reference to FIG. Reference numeral 9 in the figure is a cotter type, and this cotter type 9 not only indicates the external dimensions corresponding to the depth and size of the cotters to be temporarily formed on the PC, but also allows for mutual spacing according to the pitch of the cotters. and furthermore,
They are interconnected and integrated by wooden connecting frames 10 and 11.

Moreover, FIG. 2 shows another embodiment of the mold for forming a cotter 8A, in which the cotter mold 9 is formed by connecting frames 12 and 13 made of angles made of W4 instead of the wooden connecting frame in the previous embodiment. It is one piece that is connected to each other.

Next, an example of a temporary PC manufacturing method using the mold for forming a cotter shown in FIG. 1 or 2 is shown in FIGS. 3 and 4.
This will be explained according to the diagram.

Sl: A formwork 1 is installed on a laying formwork (not shown), and reinforcing bars are assembled within the formwork 1.

S2. Concrete 2 is poured into formwork 1.

S3: Level the top (upper surface) of concrete 2.

S4: Press the mold 8 for forming the concrete 2, which has been prepared in advance (see S10 and S11 described later), onto the top of the concrete 2.

S5: Level the top of concrete 2.

S6: Remove the concrete forming formwork 8.

S7. Concrete curing.

Preparation work for cotter form 8 S10: A cotter forming form 8 having a structure as shown in FIG. 1 is prepared.

S11+Clean and dampen the formed formwork 8.

It should be noted that the mold for forming a cotter 8 removed from the mold in S6 is cleaned (S12), and then
After proceeding to step 11, it undergoes prescribed treatment and is used again for construction of Kotsukuku.

The structure of the mold for forming a cotter is not limited to the one in which the cotter mold is supported by the frame as in each of the above embodiments, but may also be a structure in which the cotter mold is attached to the underside of a plate-like object such as a scaffolding board. It may be of.

``Effects of the Invention'' As is clear from the above description, the present invention provides a method for connecting a large number of cotters having external shapes corresponding to the cotters to be formed, while arranging them at predetermined mutual intervals and on the same plane. A formwork for forming a cotter is used, and before the concrete poured into the formwork for forming a PC board hardens, the surface of the concrete is pressed by the cotter mold to form a cotter. Therefore, concrete was poured into the formwork for temporary PC manufacturing, and after the air contained in the concrete was released, a concrete mold was pressed against the surface of the concrete, causing air bubbles to form on the surface of the PC@. There is no trace left behind, and since the cotter molds are interconnected and integrated at predetermined intervals, it is possible to form cotters with accurate pitch and depth.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a mold for forming a potter according to the present invention, FIG. 2 is a perspective view of an embodiment of a pond, and FIG. 3 is a flowchart showing the steps of an embodiment of the present invention. , FIG. 4 is a sectional view showing an example of a PC board manufactured by applying the present invention,
FIG. 5 is a cross-sectional view showing an example of a conventional method for forming a cotter;
FIG. 6 is a sectional view showing another example of the conventional method for forming a cotter. ! ...Formwork, 2...Concrete, 8
・8A・・・Formwork for forming a cotter, 9・・・・・・
Kotter type, lO・11-12・13・・・・Connection frame. Figure 1 Figure 2 A

Claims (2)

[Claims] (1) PC is created by pouring concrete into the formwork.
In a manufacturing method for manufacturing a board, a formwork for forming a cotter is formed by interconnecting and integrating a number of cotter molds that press the surface of poured concrete to form a cotter before the concrete hardens. A method for forming a cotter in a PC board, the method comprising placing the PC board on concrete. (2) In a formwork for forming a cotter, which is placed on uncured concrete placed in a formwork for manufacturing PC boards and forms a recess that will become a cotter on the surface of the concrete, It has a plurality of cotter molds having an outer shape corresponding to the cotter, and a connecting frame that connects the plurality of cotter molds together with the plurality of cotter molds arranged on the same plane at mutual intervals corresponding to the pitch of the cotters. Characteristic formwork for forming cotters.