JP2937798B2 - Concrete segment joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a joint surface of a concrete segment.

[0002]

2. Description of the Related Art There are various types of joints at a joint surface of a concrete segment. A metal box having a bolt hole is buried in the joint surface, and a joint hole is provided in concrete around the metal box. It is generally done by tying. In addition, instead of one of the box metal parts, a type in which a nut is buried as an insert is often adopted.

[0003]

In any case, the diameter of the bolt hole and the buried nut of the joint end plate of the metal box is equal to the diameter of the bolt to be inserted. It is difficult to insert or insert bolts during the joining operation of the above, which causes a decrease in work efficiency.

[0004]

SUMMARY OF THE INVENTION The present invention facilitates the insertion of bolts into bolt holes and the insertion into buried nuts, improves the efficiency of concrete segment joining work, and accurately joins concrete segments. It is intended to do so.

That is, according to the present invention, in the case of a joint of the type in which two boxed parts are joined together by bolting together, the bolt holes of the two joining end plates to be joined form a continuous taper. The present invention relates to a joint structure characterized in that a hole is formed in a tapered shape, and a space between a head portion of a bolt to be inserted and a screw thread is formed in a tapered shape matching a taper of a bolt hole. In the case of a joint where the metal is bolted to the buried nut and joined, the bolt hole in the joint end plate is drilled in a tapered shape, and the open end of the buried nut is tapered with a small diameter connected to the taper of the bolt hole. And a joint structure characterized by having a tapered shape between the head of the bolt to be inserted and the screw thread that matches the taper of the joint end plate bolt hole and the end of the buried nut opening end. Is

By adopting the joint structure of the present invention, in any case, the bolt can be easily inserted into the bolt hole, so that not only the efficiency of the bolt tightening operation is improved, but also the segments are connected to each other by the bolt. Since the bolts are tightened along the tapered surface, the bolts are tightened accurately and firmly.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a joint structure of the type in which box-extracted parts in the joint structure of the present invention are bolted to each other.
(A) is a perspective view of a concrete segment, (b) is a sectional view of a joint, and (c) is a longitudinal sectional view of a bolt used.

FIG. 2 shows an example of a joint structure of a type in which a box-extracted metal in the joint structure of the present invention is bolted to a buried nut, (a) is a perspective view of a concrete segment, and (b).
Is a sectional view of a joint, and (c) is a longitudinal sectional view of a bolt used.

First, a description will be given of an example of a joint structure of a type in which the metal parts of FIG. 1 are bolted to each other.

In the concrete segment 1, three box metal parts are buried on the ring joint surface, and two box metal members are buried on the segment joint surface.
Is provided. A large-diameter truncated conical bolt hole 5A is drilled in the box-extracted metal joint end plate 2A on one surface of the ring joint surface, and a small-diameter frusto-conical shape is formed in the box-extracted metal joint end plate 2B on the other surface. The bolt holes 5A and 5B are drilled in dimensions and shapes so as to form a continuous truncated cone when joined as shown in FIG. Similarly, large-diameter and small-diameter truncated-cone-shaped bolt holes are drilled in the box-punched-metal joint end plates 3A and 3B on the segment joint surface, and the bolt holes are drilled so as to form a continuous tapered surface when joined. . Bolt 7 used is (c)
As shown in the figure, the space between the head and the thread
The shape matches the taper of the bolt hole.

The work of joining the concrete segments 1 having such a joint structure will be described with reference to FIG.

The joint end plate 2A of one ring joint surface of the concrete segment 1 and the joint end plate 2B of the ring joint surface of the adjacent concrete segment 1 are closely opposed to each other, and a joint portion hole on the joint end plate 2A side is brought close. 6, a bolt 7 is inserted, the bolt 7 is inserted into the bolt holes 5A, 5B of the joint end plates 2A, 2B, and the tip is brought out to the joint hole 6 on the joint end plate 2B side.
Since the bolt holes 5A and 5B to be inserted form a taper and the bolt 7 has a tapered portion 8, this insertion is easily performed. Joint part hole 6 on the joint end plate 2B side
Then, a washer 9 and a nut 10 are fitted to the tip of the bolt 7 protruding, and the nut 10 is tightened to tighten the bolt.

An example of a joint structure of the type shown in FIG. 2 in which the metal box is bolted to the buried nut will be described.

In the concrete segment 1, three box metal parts are embedded on one surface of the ring joint surface, and two box metal members are buried on one surface of the segment joint surface. Is provided. A frustoconical bolt hole 13 having a large diameter on the joint part hole 6 side and a small diameter on the joint surface side is drilled in the ring-joined surface box-extracted metal joint end plate 2A and the segment-extracted box-extracted metal joint end plate 3A. (In the illustrated example, two bolt holes 13 are formed in one joint end plate 2A, 3A.
Are perforated as a pair. On the other surface of the ring joint surface and the segment joint surface, a pair of buried nuts 11 are buried at positions corresponding to the joint end plates 2A, 3A. As shown in (b), the buried nut 11 is composed of a tapered frustum-shaped tapered part 12 having a large opening end and a tapered frustum, and a continuous screw thread, and is continuous when the joining end plates 2A and 3A are joined to the opening end. It is formed in such a size and shape as to form a tapered surface. The bolt 7 to be used is provided with a truncated cone-shaped tapered portion 8 between the head and the screw thread as shown in FIG.
And the taper of the tapered portion 12.

The work of joining the concrete segments 1 having such a joint structure will be described with reference to FIG.

The joint end plate 2A on one ring joint surface of the concrete segment 1 and the buried nut 11 on the ring joint surface of the adjacent concrete segment 1 are closely opposed to each other, and the joint hole 6 on the joint end plate 2A side is brought close. The bolt 7 is inserted, and the bolt 7 is inserted into the bolt 13 of the joint end plate 2A, and the tip is inserted into the buried nut 11. Bolt hole 13 and buried nut 1
Since the tapered portion 12 at the opening end of the first tapered portion forms a continuous taper, and the bolt 7 has the tapered portion 8, the insertion and insertion can be easily performed. The head of the bolt 7 in the joint hole 6 is tightened to bury the nut 11
Tighten the bolt.

[0018]

According to the joint structure of the concrete segment of the present invention, the bolt can be easily inserted into the bolt hole, and not only the efficiency of the bolt tightening operation is improved, but also the segments are tightened along the tapered surface of the bolt. Therefore, the bolt is accurately and firmly tightened.

[Brief description of the drawings]

1A and 1B show an example of a joint structure of a type in which box-extracted metal parts in a joint structure of the present invention are bolted to each other, (a) is a perspective view of a concrete segment, (b) is a cross-sectional view of a joint, (C) is a longitudinal sectional view of the bolt used.

FIG. 2 shows an example of a joint structure of a type in which a box-extracted metal in the joint structure of the present invention is bolted to a buried nut, and FIG.
3 is a perspective view of a concrete segment, (b) is a sectional view of a joint, and (c) is a longitudinal sectional view of a bolt used.

[Explanation of symbols]

1 ··· Concrete segment, 2A, 2B ··· Ring joint surface joint end plate, 3A, 3B ··· Segment joint surface joint end plate, 4 ··· Joint surface, 5A, 5B ··· Bolt hole, 6 ···
Joint hole, 7 bolt, taper of 8 bolt, 9 washer, 10 nut, 11 buried nut, 12 taper of buried nut, 13 bolt hole.

Claims (2)

(57) [Claims] 1. A box metal part is buried on both sides of a joint surface, and a bolt is inserted through a bolt hole formed in a joint end plate of the box metal part.
In the joint structure of the concrete segment to be bolted, while the bolt holes of the two joining end plates to be joined are drilled in a tapered shape in a form of a continuous taper,
A joint structure for a concrete segment, characterized in that a portion between a head portion of a bolt to be inserted and a screw thread has a tapered shape matching a taper of a bolt hole. 2. A concrete segment in which a metal box is buried in one of the joining surfaces, a buried nut is buried in the other, and a bolt inserted into a bolt hole formed in a joint end plate of the metal box is bolted to the buried nut. In the joint structure of (1), the bolt hole of the joint end plate is drilled in a tapered shape, the open end of the buried nut is formed in a small diameter taper shape continuous with the taper of the bolt hole, and the head of the bolt to be inserted and the screw thread are formed. The joint structure of the concrete segment is characterized in that the space between the joint segment and the joint end plate has a tapered shape that matches the taper of the joint end plate bolt hole and the buried nut opening end.