JPH026896B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting concrete products and a connector for concrete products. The present invention relates to a connecting method in which two concrete products are connected by inserting a connecting member, and a connecting tool used in the method.

Conventionally, as a method for connecting concrete products such as U-shaped blocks, each concrete product is laid with a slight gap left between the connecting surfaces, and this gap is filled with a joint material such as mortar. In this method, the positioning of each concrete product is not accurate and the strength of the joints is not sufficient.

There is also a method in which a step is formed so that the inner peripheral surface of one end of the concrete product has the same shape as the outer peripheral surface of the other end, and each concrete product is overlapped at this step and connected and fixed with joint material. According to this, although there is an advantage that positioning can be performed accurately and easily and there is no deviation in the left-right direction, there is a disadvantage that the strength against deviation in the vertical direction or the front-back direction is not sufficient.

Furthermore, there is a method of burying a nut in the outer wall surface near the connecting surface of the concrete products, inserting a bolt through the connecting plate that spans between the two concrete products, screwing it into the nut, and filling the joint with a joint material to connect the products. .
This is strong enough, but the bolts must be installed one by one at the construction site, and the positions of the holes in the connection plate and the nuts do not easily match, which not only takes time and effort, but also makes it difficult to install the bolts. Tools such as spanners are often lost, and connecting plates and bolts, which are generally made of iron, are exposed to the outer surface of concrete products, so they corrode over time and become durable. It has the disadvantage of being inferior in gender.

The present invention solves the above-mentioned drawbacks, and its purpose is to position both concrete products simply by butting them together with their connecting surfaces facing each other, making construction easy. The purpose of the present invention is to provide a method for manufacturing a concrete product that can withstand high temperatures, and a connecting tool used therein.The feature is that it is formed of a cylindrical body with one end closed, and the inner circumferential surface following the open end is widened in the middle to form a step. Both concrete products, which are buried with openings on their respective connecting surfaces, are arranged facing each other, and the shape of the inner circumferential surface of the open end of the receiving member becomes smaller due to external force on the circumferential surfaces of both ends, and the external force is reduced. When the two concrete products are butted together, a connecting member in which an engaging protrusion that is restored and becomes larger than the inner circumferential surface is formed is inserted into the receiving member, and the engaging protrusion is inserted into the receiving member. The concrete product is engaged with the stepped portion to connect and fix both concrete products, and is formed of a cylindrical body with one end closed, and the inner circumferential surface following the open end is widened halfway to form the stepped portion. A receiving member that opens in the connection surface of a concrete product and is buried in multiple locations, and when inserted into the receiving member, it is pressed and narrowed by the inner circumferential surface of the open end of the receiving member, and the inner circumferential surface and a connecting member having engaging protrusions formed on the circumferential surfaces of both ends thereof, which pass through the widened portion, return to their original shape, and engage with the stepped portion.

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.

Reference numeral 2 denotes a receiving member that is integrally molded with an opening on the connecting surface 1a. The receiving member 2 is formed of a cylindrical body with one end closed, and the inner peripheral surface thereof is widened at a predetermined position from the open end to form a stepped portion 2a.
This widened inner peripheral surface has a shape that is narrowed toward the bottom surface. Further, the outer peripheral surface shape of the receiving member 2 follows the shape of its inner peripheral surface, and the stepped portion 2b serves to prevent the receiving member 2 from coming off.

3 is a connecting member, and the shape of its body 3a is as follows:
It has a shape that fits into the inner circumferential surface of the opening end of the receiving member 2, and an umbrella-shaped head 3b that narrows toward the tip is formed at both ends. The size of the tip of the head 3b is smaller than the opening of the receiving member 2, and the base end, which is the engaging protrusion 3c, is formed larger than that, and furthermore, the head 3b has elasticity. A slot 3d is formed in the axial direction to reduce the diameter. Also, the width of the slot 3d is the head 3a.
The maximum size of the head 3a is made smaller than the opening of the receiving member 2 when the diameter of the head 3a is reduced.

In addition, when the shape of the opening surface of the receiving member 2 is square, the shape of the body 3a of the connecting member 3 is a square column as shown in FIG.
is formed only on the opposing side surface, and the receiving member 2
When the opening surface shape is round, as shown in FIG. 3, it is formed of a round bar, and the slot 3d thereof is formed in a cross shape.

Furthermore, the engaging protrusion 3c is not limited to the one described above, but may be attached to other structures such as a plate spring (not shown) that protrudes from the circumferential surface so that it sinks inward when the plate spring (not shown) is pressed. You may.

Furthermore, if the surface of the receiving member 2 is roughened, the receiving member 2 and the concrete product will come into close contact with each other.

Next, a method of connecting concrete products 1 in which the receiving members 2 are buried is explained. The connection surfaces of the concrete 1 to be connected are faced to each other, and the connecting member 3 is attached to one of the concrete products in advance to the receiving member 2. If both concrete products 1 are engaged and butted against each other, the head 3a of the connecting member 3 will engage with the stepped portion 2a of each receiving member 2 with its engagement protrusion 3c, and both concrete products 1 will be Connected. Thereafter, the joints left between the connecting surfaces of both concrete products 1 are filled with a joint material such as mortar, and the connection work is completed.

Note that the engagement of the connecting member 3 to one of the concrete products 1 may be performed at the construction site, or may be performed at a factory where the concrete product 1 is formed.
This can be done as appropriate depending on the situation at the construction site.

In this way, according to the present invention, it is possible to connect both concrete products by simply butting them together, and the connection work is extremely easy and the working time can be significantly shortened. Since the connecting members are buried within the concrete product, they will not corrode even if they are made of iron, and the connection points will be highly durable even after many years of use. can play.

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 drawings]

FIG. 1 is a sectional view showing a state in which concrete products are connected, and FIGS. 2 and 3 are perspective views of the connecting member. 1... Concrete product, 1a... Connection surface, 2
...Receiving member, 2a, 2b...Stepped portion, 3...Connecting member, 3a...Body, 3b...Head, 3c...Engagement protrusion, 3d...Slot.

Claims (1)

[Scope of Claims] 1. A receiving member formed of a cylindrical body with one end closed and whose inner peripheral surface following the open end is widened midway to form a stepped portion is buried with openings on each connecting surface. Both concrete products are placed facing each other, and engagement protrusions are formed on both end peripheral surfaces that become smaller than the inner peripheral surface shape of the open end of the receiving member due to an external force, and restore to shape and become larger than the inner peripheral surface when the external force is removed. The connecting member having the above-mentioned concrete products formed therein is inserted into the receiving member when the two concrete products are butted together, and the engaging protrusion is engaged with the stepped portion to connect and fix both concrete products. Features: How to connect concrete products. 2. A receiving member that is formed of a cylindrical body with one end closed, the inner circumferential surface following the open end is widened halfway to form a stepped part, and is opened in the connecting surface of the concrete product and buried in multiple locations. When inserted into the receiving member, it is pressed by the inner circumferential surface on the open end side of the receiving member and is narrowed, passes through the inner circumferential surface, reaches the widened portion, restores its width, and engages with the stepped portion. A connecting tool for a concrete product, comprising a connecting member having engaging protrusions formed on the circumferential surfaces of both ends.