JPS6312983B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for connecting concrete products, and more particularly, the present invention relates to a method for connecting concrete products, and more particularly, to a method for connecting concrete products, in which a plurality of cylindrical receiving members are opened and embedded in a connecting surface.
Relating to a method for connecting concrete products that is easy to construct and has high strength and durability by fitting a connecting member between opposing receiving members during construction. .

Conventionally, as a method for connecting concrete products such as U-shaped blocks, each concrete product is laid with a slight gap left between connecting surfaces, and this gap is filled with a joint material such as mortar. This method is
The positioning of each concrete product is not accurate,
Also, the strength of the connection part 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 embedding a nut in the outer wall surface near the connecting surface of the concrete, inserting a bolt through a connecting plate extending between the two concrete products, screwing it into the nut, and filling the joint with a joint material to connect. 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 a long period of time. It has the disadvantage of being inferior in durability.

The present invention solves the above-mentioned drawbacks, and its purpose is to position and fix the two concrete products simply by butting them together with their connecting surfaces facing each other, making construction easy. The purpose is to provide a method for connecting concrete products that can withstand use.The feature is that 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, the receiving member, which has a diameter larger than the diameter of the threaded portion at the end of the threaded portion to form a stepped portion, is arranged facing each other with both concrete products to be buried with openings on their respective connecting surfaces, , a male thread is carved on the circumferential surface of one end, and an engaging portion is formed on the circumferential surface of the other end that becomes smaller than the diameter of the threaded portion due to external force, and returns to its original size and becomes larger than the diameter of the threaded portion when the external force is removed. The connecting members are screwed together at their threaded portions, the two concrete products are butted together, the engaging portion of the connecting member is inserted into the other receiving member, the engaging portion is engaged with the stepped portion, and both concrete products are screwed together. This is where concrete products are connected and fixed.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

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

Reference numeral 2 designates a receiving member integrally molded with an opening on the connecting surface 1a. This receiving member 2 is a cylindrical body with one end closed, and a flange 2 for preventing it from coming off is provided on the outer peripheral surface of the receiving member 2.
a is formed. 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-described structure, but may have another structure, such as one that sinks inward from the circumferential surface when a leaf spring (not shown) protruding from the circumferential surface is pressed. You can also wear it like this.

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 this concrete product 1 and another concrete product 1 are placed with their connection surfaces 1a facing each other, and the head 3a of the connecting member 3 is aligned with the open end of the receiving member 2, and both concrete products 1 are butted against each other, the diameter of the head 3a will be reduced. When it reaches the stepped portion 2c, the head 3a returns to its original size, and the jaws of the head 3a engage with the stepped portion 2c to prevent it from coming off. , 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. It can be effective as follows.

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, and FIG. 2 is a side view showing the head of a 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 the inner circumferential surface thereof has a thread carved from the open end to a predetermined position, and furthermore, the diameter of the threaded part becomes larger than the diameter of the threaded part, forming a stepped part. The two concrete products to be buried are arranged facing each other, with the receiving member having openings on their respective connecting surfaces, and a male thread is pre-engraved on the circumferential surface of one end of one of the receiving members, and the circumferential surface of the other end is provided with external A connecting member is formed with an engaging part that becomes smaller than the diameter of the threaded part and restores itself to become larger than the diameter of the threaded part when the external force is removed, and is screwed together at the threaded part, and the two concrete products are butted together. Connection of concrete products, characterized in that the engaging part of the connecting member is inserted into the other receiving member, and the engaging part is engaged with the stepped part to connect and fix both concrete products. Method.