JP2818667B2 - Concrete product connection method - Google Patents

Description

The present invention relates to a method for connecting concrete products.

2. Description of the Related Art As shown in FIG.
In the case where a screw hole 3 is opened and the other B has a concave portion 6 which is connected to the end surface 2 through a through hole 5 in the inner peripheral surface 4, the products A and B are connected to each other to form a manhole, for example. Conventionally, a method as shown in FIGS. 8 to 12 has been adopted.
That is, the guide pin 7a is screwed into the screw hole 3 of the concrete product A (FIG. 8), and the through hole 5 is fitted using the guide pin 7a as a guide, and the concrete product B is placed on the concrete product A (ninth embodiment). (Fig.), Then unscrew and remove guide pin 7a (No.
Finally, bolt 7b was screwed and connected (Fig. 10).
1 and 12).

[Problems to be Solved by the Invention] According to the conventional method, the number of steps is too many, and the guide pin must be removed by inserting a tool into the recess from a direction perpendicular to the guide pin. The work was very troublesome.

[Means for Solving the Problems] In the case where one of the concrete products has a screw hole of the insert opened at its end face, and the other has a concave portion which is connected to its end face through a through hole on its inner peripheral surface. Then, one end of a bolt is screwed into the screw hole, the other end is projected outside the screw hole, and both products are relatively moved with the other end as a target, and the through hole is coaxially aligned with the bolt. When it is positioned, the bolt and the through hole are fitted to make the other end protrude into the recess, and a nut is screwed and tightened to the other end.

[Operation] When one end of the bolt is screwed into an insert that opens to one end face of the concrete product, the other end protrudes from this end face to the outside, and this serves as a target for alignment with the other through-hole of the concrete product. When this other end is inserted through the through-hole of the other concrete product and comes into the other concave portion, the other end is also threaded, so a nut is screwed into this screw and tightened. By simply doing so, the two concrete products are connected with their end faces in contact.

In other words, this bolt also serves as a guide and screwing tool for positioning the screwed portions of both concrete products.

[Example] Cylindrical concrete products A and B were put on end faces 1 and 2 of each other.
Are connected to each other to form a manhole.
This will be described with reference to FIGS.

One of the concrete products A has a screw hole 3 of an insert 11 embedded in the end face 1 thereof. On the other side B of the concrete product, a concave portion 6 is formed in the inner peripheral surface 4 and the end surface 2 is formed.
The recess 6 is in communication with the recess 6. In the illustrated example, a concave portion is formed in the inner peripheral surface, and a leg 15
The above configuration is realized by embedding a U-shaped metal fitting 12 (FIG. 7) with a hole. Reference numeral 7 denotes a special bolt which is provided with a male screw at both ends e and f, and a hexagonal bolt head h having a smaller diameter than the male screw is formed at one end e. A spanner is inserted into the head h, and the other end f of the bolt 7 is screwed into the screw hole 3 of the concrete product A (FIG. 2). This bolt 7 is first used as a guide. That is, the through hole 5 is
Product B on concrete product A
, A and B can be easily positioned coaxially.
One end e of the bolt 7 projects into the recess 6 (FIG. 3). If a nut 8 is screwed into the bolt e and tightened, A and B are coaxially and strongly connected (FIGS. 4 and 5). .

If the bolt 7 hits the end face 2 or the periphery of the through hole 5 and is bent or the screw portion is broken when the bolt 7 and the through hole 5 are aligned, the bolt 7 must be replaced and re-aligned. . In order to prevent this, it is necessary to cover the bolt 7 with a hard cap 9 and fit the bolt 7 and the through hole 5 (FIG. 6). After the fitting, remove the cap 9 and screw the nut 8 to the bolt 7. desirable.

 In addition, 14 is a washer (FIG. 4 etc.).

[Effects of the Invention] According to the present invention, bolts are screwed into inserts only when connecting concrete products, so that there is no hindrance to stacking or arranging the products before connection, and in connecting. The end of the bolt protruding from the end of the product acts as a guide, so that it is easy to align the two products.In addition, the bolt is also threaded at the part protruding into the recess, so a nut is attached to this screw. By screwing the bolts, it is not necessary to remove the bolts, and the bolts can be used as connecting means. Therefore, various effects can be obtained, such as shortening the process and facilitating the work.

[Brief description of the drawings]

FIG. 1 is a partially sectional perspective view showing an example of a connection method according to the present invention, FIGS. 2 to 5 are partial front views of the connection portion, and FIG. 6 shows a case where a temporary cap 9 is put on a bolt 7. Sectional view, seventh
The figure is a perspective view of the U-shaped bracket P, and FIGS. 8 to 12 are partial front views of a connecting portion showing a conventional connecting method. 1,2 ... end face, 3 ... screw hole, 4 ... peripheral face, 5 ... through-hole,
6 ... recess, 7 ... bolt, 8 ... nut, 9 ... cap, 11 ... insert, 12 ... U-shaped bracket, 14 ... washer, 15 ... leg, A, B ... concrete products , E, f ... the ends.

Claims (1)

(57) [Claims] 1. A method of connecting two concrete products (A, B) with their end faces (1, 2) in contact with each other, wherein one (A) of the concrete products has an insert (11) on its end face (1). In the case where the screw hole (3) is open and the other (B) is formed with a concave portion (6) communicating with the end surface (2) through the through hole (5) on the inner peripheral surface (4), One end (f) of the bolt (7) is screwed into the screw hole (3) so that the other end (e) protrudes out of the screw hole (3), and the other end (e) is relatively positioned with respect to the target. When the two products (A, B) are moved and the through-hole (5) is positioned on the same axis as the bolt (7), the bolt (7) and the through-hole (5) are fitted and the other A method for connecting a concrete product, wherein an end (e) is exposed in the recess (6), and a nut (8) is screwed into the other end (e) and fastened.