JP4344466B2 - Tightening structure and method of concrete products - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure and method in which concrete products such as box culverts are connected and the end surfaces of the concrete products are tightly joined to each other, and the construction is particularly easy to construct and loosen by simple processing. The present invention relates to a structure and a method for fastening concrete products that can be stopped.
[0002]
[Prior art]
When constructing a waterway by laying concrete products such as box culverts and U-shaped groove blocks used to construct a waterway underground, water penetration into the basement due to water leakage is prevented, and the ground is unequal. In order to prevent a shift of a water channel caused by subsidence or the like, concrete products are tightly coupled to each other.
[0003]
As a conventional means for tightening such a concrete product, a method of tightening and bonding the end of the concrete product with a PC steel rod is known.
For example, in the case of a box culvert, PC steel rod insertion holes are provided at the four corners at the ends of the box culverts to be joined together, and when connecting the ends of the box culvert, these tension material insertion holes are made to coincide. Next, after inserting a PC steel rod into each tension material insertion hole, a nut is screwed into the end of the PC steel rod. Then, the nut is firmly tightened to the PC steel bar to bind the concrete product.
[0004]
As another means, embedded nuts, so-called inserts are attached to the side surfaces of concrete products such as box culverts and U-shaped groove blocks, and metal connection members using bolts screwed into these embedded nuts. There are also means for attaching and connecting the concrete products together.
[0005]
In this case, the concrete product cannot be tightened only by tightening the connecting member with a bolt. Therefore, at least one of the bolt holes of the connecting member is made into a long hole, and using a propulsion drive source such as a hydraulic jack, the end of the concrete product to be joined is pressed against the end of the already laid concrete product. Means for tightening the concrete product may be taken by tightening the connecting member with a bolt.
[0006]
[Problems to be solved by the invention]
However, in the case of the concrete fastening means such as the former, the structure of the end portion of the concrete product becomes complicated, so that the work man-hours in the factory such as assembling of the mold and molding of the concrete product increase. Furthermore, after tightening the nut on the PC steel rod, the mortar must be filled inside the hollow portion containing the nut as a loosening prevention. For this reason, the number of work steps required for post-processing is increased, and it is difficult to speed up the construction. Furthermore, since the nut is embedded with mortar, it is not possible to retighten the nut when the nut is tightened.
[0007]
In addition, the latter means for connecting concrete products requires the troublesome process described above, ie, pressing concrete products using a propulsion drive source such as a jack, in order to tighten the concrete products. An increase in man-hours on site is inevitable. Also, if the metal connection member and the nut are slippery with each other, even if one of the bolt holes of the connection member is tightened with a bolt, it will be connected to the bolt if an external force is applied in the longitudinal direction of the concrete product. The member may be displaced from each other. In order to prevent this, it is necessary to weld the bolt to the connecting member after tightening, and there is still a problem that the number of work steps required for post-processing increases.
[0008]
In the present invention, in view of such problems in the conventional means for fastening concrete products, a concrete product can be easily produced in a factory without using a complicated formwork. At the construction site, concrete products can be easily tightened without using a hydraulic jack, etc., and the final loosening can be easily prevented. Once the loosening is stopped, the loosening is released again. It is an object of the present invention to provide a fastening tool and method for concrete products that can be retightened.
[0009]
[Means for Solving the Problems]
In the present invention, in order to achieve the above object, the ends of the joined concrete products 1 and 1 are connected by turnbuckles 6, and connecting screws 7 a and 7 b that are reversely screwed to both ends of the turnbuckle 6 are connected. It was possible to tighten the turnbuckle 6 in a protruding state without completely tightening the connected fixing screws 8 and 8. Further, the turnbuckle 6 is prevented from rotating by tightening the fixing screws 8 and 8 connected to the connecting screws 7a and 7b. As a result, the tightening by the turnbuckle 6 and its rotation prevention can be easily performed only by operating the fixing screws 8 and 8.
[0010]
That is, the concrete product tightening structure according to the present invention includes embedded nuts 4, 4 provided on end side surfaces of the joined concrete products 1, 1, and fixing bolts 8 screwed into the embedded nuts 4, 4, respectively. , 8, and connecting bolts 7 a and 7 b, which are oppositely threaded, are screwed into both ends, and the connecting bolts 7 a and 7 b are connected to the fixing bolts 8 and 8, and the turn buckle 6 is tightened to provide concrete. The end faces of the products 1 and 1 are tightly joined, and in this state, the fixing bolts 8 and 8 are fastened to the embedded nuts 4 and 4 to press the turnbuckle 6 against the side surfaces of the concrete products 1 and 1. 6 is a detent.
[0011]
The method of obtaining such a tight state of the concrete product is as follows. Fixing bolts 8 and 8 are respectively screwed into embedded nuts 4 and 4 provided on the side surfaces of the joined concrete products 1 and 1, respectively. After the turnbuckle 6 is tightened and the end faces of the concrete products 1 and 1 are tightly joined to each other, the fixing bolts 8 and 8 are By tightening to the embedded nuts 4, 4, the turn buckle 6 is pressed against the side surfaces of the concrete products 1, 1 to prevent the turn buckle 6 from rotating.
[0012]
In this case, the turnbuckle 6 is not rotated with the fixing bolts 8 and 8 being completely tightened to the embedded nuts 4 and 4 with the heads of the embedded nuts 4 and 4 protruding from the side surfaces of the concrete products 1 and 1. Is possible. Therefore, the turnbuckle 6 can be rotated and tightened.
[0013]
On the other hand, by tightening the fixing bolts 8 and 8 to the embedded nuts 4 and 4, the turnbuckle 6 is pressed against the side surfaces of the concrete products 1 and 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 and 8.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described specifically and in detail with reference to the drawings.
1 and 2 show an example of a concrete product 1 for carrying out a concrete product binding structure and method according to an embodiment of the present invention. The concrete product 1 shown in FIGS. 1 and 2 is a box culvert. However, the concrete product to which the present invention is applied is not limited to the box culvert, for example, in the longitudinal direction such as a U-shaped groove block or a retaining block. It can be applied to general concrete products that are installed together.
[0015]
Since the concrete product 1 illustrated in FIGS. 1 and 2 is a box culvert, the cross section has a square shape, and the illustrated one has an inverted trapezoidal shape. The inside of the concrete product is a cavity having a uniform longitudinal section in the longitudinal direction, and this is the water channel 2.
Around the water channel on the end surface of the concrete product 1, a groove-like packing insertion groove 3 is provided. Inside the packing insertion groove 3, guide holes 5 and 5 for inserting guide pins are provided at two locations, upper and lower.
[0016]
On both sides of the concrete product 1, embedded nuts 4, so-called inserts, are embedded near the ends. As will be described later, the embedded nut 4 is for fastening the concrete product 1 to be joined together. In addition, embedded nuts 11, so-called inserts, are embedded in both sides of the concrete product 1 and in the middle part thereof. The embedded nut 11 is used to screw a wire hook such as an eye nut in order to suspend the concrete product 1 with a crane when the concrete product 1 is laid.
These embedded nuts 4 and 11 are placed in advance at predetermined positions in the mold when the concrete products 1 and 1 are molded. Can be embedded in the aforementioned positions of the concrete products 1, 1.
[0017]
3 and 4 are cross-sectional views of the side wall on one side near the ends of the concrete products 1 and 1 in a state where the pair of concrete products 1 and 1 are joined together. Although the side surface of one side of concrete products 1 and 1 is shown, the other side has the same structure symmetrically. FIG. 3 shows a state before tightening, and FIG. 4 shows a state where binding has been completed. The upper side is the inside of the water channel, and the lower side is the outside of the water channel. FIG. 5 is a side view as seen from the outside of the water channel 2 in the state of FIG. 4.
[0018]
As shown in FIGS. 3 and 4, the embedded nut 4 is embedded in the side wall of the concrete product 1, 1 so that its end surface is flush with the side surface of the concrete product 1, 1.
Such a construction for joining the concrete products 1 and 1 is performed as follows.
[0019]
First, the end face of another concrete product 1 to be joined to the end face of the concrete product 1 already laid in the ground is opposed to the end of the concrete product 1, 1 between the packing insertion grooves 3 and 3. Insert the ring-shaped packing 10 having water. And a guide pin is inserted in the guide holes 5 and 5 of the end surface of the concrete product 1, and these end surfaces are abutted, aligning the concrete products 1 and 1 mutually. In this state, ring-shaped washers 9 and 9 are attached to the fixing nuts 8 and 8, and the fixing nuts 8 and 8 are screwed into the embedded nuts 4 and 4, respectively.
[0020]
Further, a turnbuckle 6 is prepared, and connecting bolts 7a and 7b which are reverse screws are screwed into the female reverse screws at both ends. The front ends of the connecting bolts 7a and 7b are hook-shaped, and as shown in FIG. 3, the heads of the fixing nuts 8 and 8 in which the front ends of the connecting bolts 7a and 7b are screwed into the embedded nuts 4 and 4, respectively. And isher 9 and 9.
[0021]
In this state, as shown in FIG. 3, the fixing nuts 8, 8 are not completely screwed into the embedded nuts 4, 4, and the fixing nuts 8, 8 and washers 9, 9 protrude from the side surfaces of the concrete products 1, 1. In this state, the turnbuckle 6 is separated from the side surfaces of the concrete products 1 and 1, and the turnbuckle 6 can be rotated. Therefore, in this state, the turnbuckle 6 is rotated in the direction in which the connecting bolts 7a and 7b are fastened, and fastened so that the end faces of the concrete products 1 and 1 are in close contact with each other. This tightening is performed simultaneously or alternately on both side surfaces of the concrete products 1 and 1. Thereby, the packing 10 inserted between the packing insertion grooves 3 and 3 is compressed, and the end surfaces of the concrete products 1 and 1 are closely joined.
[0022]
When the ends of the concrete products 1 and 1 are sufficiently tightened by tightening the turnbuckle 6, the turnbuckle 6 is vertically arranged along the side walls of the concrete products 1 and 1 as shown in FIGS. To do. In this state, the fixing nuts 8 are tightened. Thereby, the side surface of the turnbuckle 6 is strongly pressed against the side surface of the concrete products 1 and 1. Since the turnbuckle 6 has a width dimension (vertical dimension in FIG. 4) smaller than a height dimension (vertical dimension in FIG. 5), the side surface of the turnbuckle 6 strongly presses against the side surfaces of the concrete products 1 and 1. When applied, the turnbuckle 6 cannot rotate and is prevented from rotating.
Furthermore, even after the rotation is stopped, the turnbuckle 6 can be tightened again by loosening the fixing bolts 8 when necessary.
[0023]
【The invention's effect】
As explained above, in the concrete product tightening structure and method according to the present invention, when the concrete products 1 and 1 are molded, it is only necessary to embed the embedded nuts 4 and 4 on the side surfaces of the end portions. A concrete product can be easily manufactured with a conventional formwork without using a simple formwork.
[0024]
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 fastened and the end surfaces of the concrete products 1 and 1 can be joined closely. On the other hand, by tightening the fixing bolts 8, 8 to the embedded nuts 4, 4, the turnbuckle 6 is pressed against the side surfaces of the concrete products 1, 1 and is prevented from rotating. As a result, it is possible to easily tighten concrete products without using a hydraulic jack, etc., and to easily prevent final loosening. It can also be corrected.
[Brief description of the drawings]
FIG. 1 is an intermediate side view showing an example of a concrete product tightening structure and a concrete product used for carrying out the method according to an embodiment of the present invention.
FIG. 2 is a front view showing an example of a concrete product used for carrying out the concrete product binding structure and method according to the embodiment;
FIG. 3 is a longitudinal sectional plan view of a main part showing a state in which a turnbuckle can be rotated when the concrete product is tightened with the concrete product tightening structure according to the embodiment;
FIG. 4 is a longitudinal sectional plan view of an essential part showing a state in which the concrete product is tightened and the turnbuckle is prevented from rotating, with the concrete product tightening structure and method according to the embodiment;
FIG. 5 is a side view of an essential part showing a state in which the tightening of the concrete product in the concrete product tightening structure and method according to the embodiment and the turnbuckle are prevented from rotating are shown.
[Explanation of symbols]
1 Concrete product 4 Embedded nut 6 Turnbuckle 8 Fixing bolt 7a Connection bolt 7b Connection bolt

Claims (4)

A concrete product (1), (1), and the joined concrete product (1), which is a concrete product tightening structure that tightly clamps the end faces of (1), the joined concrete product (1), The embedded nuts (4) and (4) provided on the side surfaces of the end of (1) and the fixing bolts (8) and (8) respectively screwed into the embedded nuts (4) and (4) A reverse buckle connection bolt (7a), (7b) is screwed into both ends, and the connection bolt (7a), (7b) is connected to the fixing bolt (8), (8) and a turnbuckle (6) The turnbuckle (6) is tightened to tightly join the end faces of the concrete products (1) and (1). In this state, the fixing bolts (8) and (8) are inserted into the embedded nuts (4) and (4 ) Le (6) concrete products (1), Tightened structure of concrete products, characterized in that against the sides were fastened around the same turnbuckle (6) (1). By tightening the fixing bolts (8) and (8) to the embedded nuts (4) and (4) with the turnbuckle (6) tightened, the turnbuckle (6) is fixed to the concrete product (1) and (1). The concrete structure binding structure according to claim 1, wherein the concrete product is pressed against a side surface of the concrete product. A concrete product (1), a method of binding concrete products (1), wherein the end surfaces of the joined concrete products (1) and (1) are tightly tightened, the cemented concrete products (1), (1) The fixing bolts (8) and (8) are screwed into the embedded nuts (4) and (4) respectively provided on the side surfaces of the end portions, and the reverse screws are connected to each other at both ends of the turnbuckle (6). Bolts (7a), (7b) After tightening the turnbuckle (6) connected to the fixing bolts (8), (8), the end surfaces of the concrete products (1), (1) are tightly joined, By tightening the fixing bolts (8) and (8) to the embedded nuts (4) and (4), the turnbuckle (6) is pressed against the side surface of the concrete product (1) and (1), and the turnbuckle (6 ) Tightened way of concrete products, characterized in that the detent. The turnbuckle (6) is turned and tightened in a protruding state before the fixing bolts (8), (8) are completely tightened to the embedded nuts (4), (4), and then the fixing bolts (8), ( Concrete product according to claim 1, characterized in that the turnbuckle (6) is pressed against the side of the concrete product (1), (1) by tightening 8) to the embedded nut (4), (4). Tight structure.

Images