JPS6312984B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connecting tool for concrete products, and more specifically, to a concrete product that connects and fixes both concrete products by simply facing and butting the connecting surfaces of the concrete products to be connected. Concerning connectors.

Conventionally, concrete products that are connected like U-shaped blocks to form drainage ditches, etc., have nuts buried in the outer wall surface near the connecting surface.
A bolt was inserted into a connecting plate extending between both concrete products, and the bolt was tightened to the nut to connect and fix both concrete products.

However, such a connection requires tightening each bolt at the construction site, and the holes in the connection plate and the positions of the nuts are difficult to match, making construction time-consuming and requiring the use of a spanner or other tool to tighten the bolts. Tools are often lost,
Furthermore, connecting plates and bolts, which are generally made of iron, are exposed on the surface of the concrete product, so they corrode over a long period of time, and the connection points have shortcomings such as poor durability.

The present invention has been made to solve the above-mentioned drawbacks, and its purpose is to connect and fix both concrete products by simply facing and abutting the connecting surfaces of both concrete products, and to facilitate the construction. Furthermore, it is an object of the present invention to provide a connecting tool for concrete products that can make the connection point superior in durability.The feature is that it is formed of a cylindrical body with one end closed, and the inner peripheral surface has an open end. A screw is carved to a predetermined position, and a stepped part is formed at the end of the screw part with a diameter larger than the diameter of the thread part, and the concrete products to be connected are opened at opposing positions of the mutual connection surfaces and buried. a receiving member, and a male thread is carved on the peripheral surface of one end to be screwed into the threaded part,
When an external force is applied to the peripheral surface of the other end, the diameter becomes smaller than the diameter of the threaded part, and when the external force is removed, it restores and becomes larger than the diameter of the threaded part, forming an engaging part that engages with the stepped part. It consists of a connecting member.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a concrete product, and 1a is its connection surface.

2 is a receiving member that is integrally molded with an opening on the connection surface. The receiving member 2 is a cylindrical body with one end closed, and a flange 2a for preventing slippage is formed on the outer peripheral surface of the receiving member 2. Further, a screw is carved on the inner circumferential surface from the opening end to a predetermined position, and at the end of the threaded portion 2b, the inner circumferential surface becomes larger in diameter than the diameter of the threaded portion 2b, forming a stepped portion 2c. .

Reference numeral 3 designates a bolt-shaped connecting member, and a male thread is carved on the circumferential surface of the connecting member to engage with the threaded portion 2b, and the head portion 3a serves as an engaging portion that engages with the stepped portion. The head 3a is formed into an umbrella shape whose diameter decreases toward the tip, and a slot 3b is formed in the axial direction so that the entire head 3a has elasticity and decreases in diameter. Note that the diameter of the tip of the head 3a is the same as that of the threaded portion 2.
The diameter of the proximal end of the head 3a is larger than the diameter of the threaded part 2b, and the width of the slot 3b is the same as the maximum diameter of the head 3a when the diameter of the head 3a is reduced. The size is such that it can be made smaller than the diameter of 2b.

Note that the head 3a serving as the engaging portion is not limited to the above-mentioned structure, but may have another structure, for example, when a leaf spring (not shown) protruding from the circumferential surface is pressed, the head 3a may sink inward from the circumferential surface. It may be worn as shown.

Next, a method for connecting the concrete products 1 in which the receiving members 2 are respectively buried will be explained.

The connecting member 3 is attached in advance to one of the concrete products 1 to be connected by screwing it into the threaded part 2b. This screwing operation of the connecting member 3 may be performed at the construction site or at another location such as a factory where the concrete product 1 is formed.

If you place this concrete product 1 and another concrete product 1 with their connecting surfaces 1a facing each other, align the head 3a of the connecting member 3 with the open end of the receiving member 2, and butt both concrete products 1, the head 3a is reduced in diameter and passes through the threaded part 2b, and when it reaches the stepped part 2c, the head 3a returns to its original size, and the jaw of the head 3a passes through the stepped part 2c.
c and is prevented from coming off, and both concrete products 1 are connected and fixed.

After that, the connecting surface 1 of both concrete products 1
The joints left between a are filled with a joint material such as mortar, and the connection work is completed.

In this manner, according to the present invention, it is possible to connect and fix both concrete products by simply screwing the connecting member onto one of the concrete products and butting the two concrete products together. This is extremely easy and can also shorten the working time.

Furthermore, since one of the connecting members and the receiving member is connected by screwing, the gap between the joints left between the two concrete products can be adjusted as desired.

Furthermore, since the same receiving member is buried in both concrete products, the concrete product with the connecting member attached in advance can be used as the desired one depending on the situation at the construction site, making it easier to use. becomes.

Furthermore, when embedding the receiving member in a concrete product, the threaded portion of the receiving member can be used to screw onto the template, so the end face of the receiving member and the template are in close contact, and the end surface of the receiving member is in close contact with the template. It is possible to achieve remarkable effects such as preventing cement from flowing in and solidifying.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a state in which concrete products are connected using a receiving member and a connecting member according to the present invention, and FIG. 2 is a side view showing the head of the connecting member. 1... Concrete product, 1a... Connection surface, 2
...Receiving member, 2a...Flange, 2b...Threaded part, 2c...Step part, 3...Connecting member, 3a...
Head, 3b...slit.

Claims (1)

[Claims] 1 It is formed of a cylindrical body with one end closed, and a screw is carved into the inner peripheral surface from the open end to a predetermined position,
Furthermore, a step part is formed at the end of the threaded part with a diameter larger than the diameter of the threaded part, and a receiving member is opened and buried at a position facing each other's connecting surfaces of the concrete products to be connected, and a receiving member is formed on the circumferential surface of one end. A male thread is carved into the threaded part, and when external force is applied to the other end circumferential surface, the diameter becomes smaller than the diameter of the threaded part, and when the external force is removed, it restores and becomes larger than the diameter of the threaded part. A connecting tool for a concrete product, comprising a connecting member in which an engaging part that engages with the stepped part is formed.