JP2002061266A - Method for binding concrete products - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce concrete products 1 and 1 without using a complicated form, to facilitate binding of the concrete products and final locking of the same in the construction field, and to enable to release the locking of the concrete products even after the locking and to fasten the concrete products again. SOLUTION: Ends of the joined concrete products 1 and 1 are connected together by means of a turn buckle 6, and connecting screws 7a and 7b which are inverted screws to each other have one ends thereof screwed into both ends of the turn buckle 6 and the other ends thereof connected to respective fixing screws 8 which are not completely fixed to the respective concrete products 1 and 1 but protruded from the same. In this condition, the turn buckle 6 is fastened, and thereafter the fixing screws 8 and 8 are fastened. In this manner, whirl-stop of the turn buckle 6 is achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and a method for connecting concrete products such as box culverts and the like so as to tightly join the end faces of the concrete products.
Also, the present invention relates to a concrete product binding structure and method capable of preventing loosening by simple processing.

[0002]

2. Description of the Related Art When constructing a waterway by laying a concrete product such as a box culvert or a U-shaped groove block used for constructing a waterway underground, the penetration of water into the underground due to water leakage is prevented. Further, concrete products are tied to each other in order to prevent displacement of a water channel due to uneven settlement of the ground and the like.

[0003] As a conventional means for binding concrete products, a method of fastening the ends of concrete products with PC steel bars is known. For example, in the case of a box culvert, PC steel rod insertion holes are provided at four corners at the ends of the box culverts to be joined together, and these tendon insertion holes are matched when the ends of the box culvert are connected. Next, a PC steel rod is inserted into each tendon insertion hole, and a nut is screwed into an end of the PC steel rod. Then, a nut is strongly tightened to the PC steel bar to tighten the concrete product.

Further, as another means, embedded nuts, so-called inserts, are mounted on the side surfaces of concrete products such as box culverts and U-shaped groove blocks, and bolts screwed into these embedded nuts are used to make metal products. There is also a means for attaching concrete connecting members and connecting concrete products to each other.

[0005] In this case, the concrete product cannot be tightened only by tightening the connecting member with the bolt. Therefore, at least one of the bolt holes of the connection member is a long hole,
Using a propulsion drive source such as a hydraulic jack, press the end of the concrete product to be joined with the end of the already laid concrete product, and tighten the connection member with bolts in this state to secure the concrete product Measures may be taken.

[0006]

However, since the structure of the end of the concrete product is complicated by the binding means of the concrete as the former, the man-hours required in the factory for assembling the formwork, molding the concrete product, etc. Increase. Furthermore, after tightening the nut to the PC steel rod, the mortar must be filled in the hollow portion containing the nut to prevent the nut from loosening. For this reason, the number of man-hours required for post-processing has increased, and it has been difficult to speed up the construction. Furthermore, since the nut is embedded in the mortar, it is not possible to retighten the nut when the nut is loosely tightened.

The means for connecting concrete products, such as the latter, requires the complicated process of pressing a concrete product using a propulsion drive source such as a jack in order to tighten the concrete product. Yes, an increase in man-hours at the construction site is inevitable. Also, if the metal connection member and the nut are slippery to each other, even if one of the bolt holes of the connection member is tightened considerably with a bolt, if an external force is applied in the longitudinal direction of the concrete product, the connection with the bolt is made. In some cases, the members and the members may shift and move.
In order to prevent this, it is necessary to weld the bolt to the connection member after tightening, which also has a problem that the number of work steps required for post-processing is increased.

The present invention has been made in view of the above-mentioned problems in the conventional means for binding concrete products.
Concrete products can be easily manufactured with conventional molds without using complicated formwork. At the construction site, concrete products can be easily bonded without using hydraulic jacks. It is another object of the present invention to provide a concrete product tying tool and a concrete product tying method, which can easily perform the final loosening prevention and can release the loosening prevention and retighten after the loosening is once performed.

[0009]

SUMMARY OF THE INVENTION According to the present invention, in order to achieve the above-mentioned object, concrete products 1 and 1 are joined together.
Are connected by a turnbuckle 6, and connection screws 7a of opposite screws screwed into both ends of the turnbuckle 6,
Without completely tightening the fixing screws 8, 8 connecting the 7b,
The fastening with the turnbuckle 6 in the protruded state is enabled. Further, the turnbuckle 6 is prevented from rotating by tightening the fixing screws 8, 8 connecting the connecting screws 7a, 7b. As a result, the tightening by the turnbuckle 6 and its rotation stop are performed by the fixing screws 8, 8.
It can be easily performed only by the operation.

That is, the concrete product binding structure according to the present invention has embedded nuts 4 and 4 provided on the end side surfaces of the joined concrete products 1 and 1 and screwed into the embedded nuts 4 and 4, respectively. Fixing bolts 8, 8
And connection bolts 7a and 7b of opposite screws are screwed into both ends, and these connection bolts 7a and 7b are fixed to the fixing bolts 8,
And a turnbuckle 6 connected to the end surface 8 of the concrete product 1, 1 by tightly tightening the turnbuckle 6. In this state, the fixing bolts 8, 8 are tightened to the embedded nuts 4, 4. By the turnbuckle 6
Is pressed against the side surfaces of the concrete products 1 and 1 to prevent the turnbuckle 6 from rotating.

The method of obtaining such a tight state of the concrete product is as follows. Fixing bolts 8 are screwed into embedding nuts 4 provided on the end side surfaces of the spliced concrete products 1 and 1, respectively. 6 are connected to the fixing bolts 8 and 8 of opposite screw threads screwed into both ends of the concrete products 1 and 1, respectively. After tightening the turnbuckle 6 to tightly join the end faces of the concrete products 1 and 1, the fixing bolts 8 and 7 , 8 are fastened to the embedding nuts 4, 4 to press the turnbuckle 6 against the side surfaces of the concrete products 1, 1 to prevent the turnbuckle 6 from rotating.

In this case, the fixing bolts 8, 8 are not completely fastened to the embedding nuts 4, 4, and the heads of the embedding nuts 4, 4 protrude from the side surfaces of the concrete products 1, 1, and the turnbuckle 6 Rotation is possible. Therefore, the turnbuckle 6 can be rotated and tightened.

On the other hand, the fixing bolts 8 and 8 are
By tightening to 4, the turnbuckle 6 is pressed against the side of the concrete product 1, 1 and is prevented from rotating. Further, even after the rotation is stopped, the turnbuckle 6 can be tightened again by loosening the fixing bolts 8.

[0014]

Embodiments of the present invention will now be described specifically and in detail with reference to the drawings.
1 and 2 show an example of a concrete product 1 for implementing a concrete product binding structure and method according to an embodiment of the present invention. Although the concrete product 1 shown in FIGS. 1 and 2 is a box culvert, the concrete product to which the present invention is applied is not limited to the box culvert, and may be, for example, a U-shaped groove block, a retaining block, or the like. The present invention can be applied to general concrete products to be seamed.

The concrete product 1 illustrated in FIGS. 1 and 2
Is a box culvert, and therefore has a square cross section, and the illustrated one has an inverted trapezoidal shape. The interior of this concrete product is a cavity having a uniform longitudinal cross section in the longitudinal direction, and serves as a water channel 2. Around the water channel on the end face of the concrete product 1, a groove-shaped packing insertion groove 3 is provided. Guide holes 5, 5 for inserting guide pins are provided at two upper and lower positions inside the packing insertion groove 3.

An embedding nut 4, a so-called insert, is embedded on both sides of the concrete product 1 and near the end. The embedding nut 4 is for binding the concrete products 1 to be seamed, as described later. An embedding nut 11, a so-called insert, is also embedded on both sides of the concrete product 1 and at an intermediate portion thereof. When laying the concrete product 1, the embedded nut 11 is used for the concrete product 1 with a crane.
For hanging a wire hook such as an eye nut in order to suspend the wire. These embedded nuts 4, 1
When molding the concrete products 1, 1, the embedding nuts 4, 11 are arranged in advance at predetermined positions in the mold when molding the concrete products 1, 1. It is possible to bury it in the aforementioned position.

FIGS. 3 and 4 show the concrete products 1 and 1 in a state where the pair of concrete products 1 and 1 are joined together.
FIG. 5 is a cross-sectional view of one side wall near the end of the first embodiment. Although one side surface of the concrete products 1 and 1 is shown, the other side surface has a similar structure symmetrically. FIG. 3 shows a state before the binding, and FIG. 4 shows a state where the binding is completed. The upper side is inside the channel and the lower side is outside the channel. FIG. 5 is a side view as viewed from the outside of the water channel 2 in the state of FIG.

As shown in FIG. 3 and FIG.
Are embedded in the side walls of the concrete products 1 and 1 such that the end faces thereof are flush with the side surfaces of the concrete products 1 and 1. The work of joining such concrete products 1 and 1 is performed as follows.

First, the end face of the concrete product 1 already laid in the ground is opposed to the end face of another concrete product 1 to be spliced.
A ring-shaped packing 10 having a water-stopping property is inserted between the packing insertion grooves 3 on the end face 1. Then, guide pins are inserted into the guide holes 5 and 5 on the end surfaces of the concrete product 1, and the end surfaces of the concrete products 1 and 1 are abutted while being aligned with each other. In this state, ring-shaped washers 9, 9 are attached to the fixing nuts 8, 8.
And fix the fixing nuts 8, 8 with the embedded nuts 4,
Screw each into 4.

Further, a turnbuckle 6 is prepared, and female bolts at both ends thereof are connected to connecting bolts 7 which are mutually reverse screws.
Screw a and 7b. The connecting bolts 7a and 7b have hook-shaped tips, and as shown in FIG. 3, the heads of the fixing nuts 8 and 8 in which the connecting bolts 7a and 7b are screwed into the embedded nuts 4 and 4, respectively. And the washer 9 are connected between them.

In this state, as shown in FIG. 3, the fixing nuts 8, 8 are not completely screwed into the embedding nuts 4, 4,
When the fixing nuts 8, 8 and washers 9, 9 protrude from the side surfaces of the concrete products 1, 1, the turnbuckle 6
Is away from the side of the concrete product 1, 1 and its turnbuckle 6 can be rotated. Therefore, in this state, the turnbuckle 6 is connected to the connecting bolts 7a, 7a.
b rotates in the direction in which the concrete products 1 and 1 are tightened so that the end faces of the concrete products 1 and 1 come into close contact with each other. This tightening is carried out simultaneously or alternately on both sides of the concrete products 1, 1. Thereby, the packing insertion grooves 3, 3
The packing 10 inserted between them is compressed, and the end faces of the concrete products 1 and 1 are tightly joined.

When the ends of the concrete products 1 and 1 are sufficiently tightened by tightening the turn buckle 6, the turn buckle 6 is moved to the position shown in FIGS.
The concrete products 1 and 1 are vertically arranged along the side walls. In this state, the fixing nuts 8 are tightened. As a result, the side surfaces of the turnbuckle 6 become concrete products 1, 1
It is strongly pressed against the side of. Since the turnbuckle 6 has a smaller width dimension (vertical dimension in FIG. 4) than a height dimension (vertical dimension in FIG. 5), the side surface of the turnbuckle 6 is strongly pressed against the side surfaces of the concrete products 1, 1. When hit, the turnbuckle 6 cannot rotate,
The detent is made. Further, even after the rotation is stopped, if necessary, the turnbuckle 6 can be tightened again by loosening the fixing bolts 8.

[0023]

As described above, in the concrete product binding structure and method according to the present invention, when the concrete products 1 and 1 are molded, the embedding nuts 4 and 4 are provided on the side surfaces of the ends.
Since it is only necessary to embed a concrete form, a concrete product can be easily manufactured without using a complicated formwork in a factory and using a conventional formwork.

Further, at the construction site where the concrete products 1 and 1 are laid, the turnbuckle 6 can be rotated with the fixing bolts 8 and 8 loosened. Thereby, the turnbuckle 6 can be tightened, and the end faces of the concrete products 1 and 1 can be tightly joined. On the other hand, by tightening the fixing bolts 8, 8 to the embedding nuts 4, 4, the turnbuckle 6 is pressed against the side surfaces of the concrete products 1, 1, and is prevented from rotating. This makes it possible to easily bind concrete products without using hydraulic jacks, etc., to easily perform final locking, and to release and tighten once locking has been performed. It can be corrected.

[Brief description of the drawings]

FIG. 1 is a side view illustrating an example of a concrete product used for carrying out a concrete product binding structure and a method according to an embodiment of the present invention, with a middle part omitted.

FIG. 2 is a front view showing an example of a concrete product used to carry out the concrete product binding structure and the method according to the embodiment;

FIG. 3 is a vertical sectional plan view of a main part showing a state in which a turnbuckle is rotatable when tightening the concrete product in the concrete product binding structure and method according to the embodiment.

FIG. 4 is a vertical sectional plan view of a main part showing a state in which the tightening of the concrete product in the concrete product binding structure and the method according to the embodiment has been completed and the turnbuckle has been prevented from rotating.

FIG. 5 is a side view of a principal part showing a state in which the tightening of the concrete product in the concrete product binding structure and the method according to the embodiment is completed, and the turnbuckle is stopped.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete product 4 Embedded nut 6 Turnbuckle 8 Fixing bolt 7a Connecting bolt 7b Connecting bolt

Claims (4)

[Claims] 1. The concrete products (1), (1) are spliced, and the spliced concrete products (1),
(1) a concrete product binding structure for tightly tightening the end face, wherein the joined concrete product (1);
Embedded nuts (4) provided on the end side surfaces of (1),
(4), fixing bolts (8) and (8) screwed into the embedding nuts (4) and (4), and connecting bolts (7a) and (7b) having opposite screws, respectively, are screwed into both ends. A turn buckle (6) in which the connecting bolts (7a) and (7b) are connected to the fixing bolts (8) and (8); and the turn buckle (6) is tightened to concrete products (1) and (1). ) Are tightly joined, and in this state, the fixing bolts (8) and (8) are connected with the embedding nuts (4),
Turnbuckle (6) by tightening to (4)
A concrete product (1), the turnbuckle (6) being pressed against a side surface of the concrete product (1) to prevent the turnbuckle (6) from rotating. 2. The fixing bolts (8), (8) are inserted into the embedding nuts (4) while the turnbuckle (6) is tightened.
Turnbuckle (6) by tightening to (4)
2. The concrete product binding structure according to claim 1, wherein the concrete product is pressed against a side surface of the concrete product. 3. The concrete products (1), (1) are joined, and the joined concrete products (1),
(1) A method for binding concrete products by tightly tightening the end faces thereof, wherein the joined concrete products (1),
Embedded nuts (4) provided on the end side surfaces of (1),
The fixing bolts (8) and (8) are screwed into (4), respectively, and the connecting bolts (7a) and (7b) of the opposite screws screwed into both ends of the turnbuckle (6), and the fixing bolts (8) and (8). This turnbuckle (6) connected to
After tightly joining the end surfaces of the concrete products (1) and (1) by tightening the fixing bolts (8) and (8) to the embedding nuts (4) and (4), the turnbuckle ( 6) A method of binding concrete products, characterized in that the turnbuckle (6) is detented by pressing the side of the concrete products (1) and (1). 4. The turnbuckle (6) is rotated and tightened in a protruding state before completely tightening the fixing bolts (8) and (8) to the embedding nuts (4) and (4), and thereafter the fixing bolt is tightened. The turnbuckle (6) is pressed against the side surfaces of the concrete products (1) and (1) by tightening (8) and (8) on the embedding nuts (4) and (4). The binding structure of the concrete product according to the above.