JP3444482B2 - 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 for a segment, and is basically directed to a joint structure for an RC (reinforced concrete) segment, but the mechanism is also applied to a steel segment or the like. It is possible.

[0002]

2. Description of the Related Art A conventional steel plate short bolt system is often used for a conventional segment joint, but the segment steel plate short bolt system has the following problems.

One of them is the problem of labor involved in working in high places and narrow places, and it is troublesome to bring in fastening parts (bolts, nuts, washers), fastening jigs (manual wrench, electric wrench or hydraulic wrench). The trouble of bringing in (usually,
This is a troublesome task of fastening work (two fastening jigs for pressing and rotating fastening are required) and fastening work (hand tightening → torque tightening by the fastening jig).

The other one is a problem relating to durability, and requires anticorrosion treatment of fastening parts (pre-coating treatment of bolts, filling of bolt box).

Due to the above problems, the safety is lowered, and it is difficult to shorten the construction period and the construction cost by the high-speed assembly of the segment.
There is a problem that it is difficult to pursue a shortened construction period and reduction of construction cost due to the need for large-scale construction of durability, and it is difficult to apply the secondary lining omission due to the necessity, and it is difficult to pursue reduction of construction period and reduction of construction cost.

Also known is a one-touch type segment joint which can be fastened simply by pressing the joint surfaces of the segments against each other.

[0007] Normally, the bolt loosens due to familiarity, etc., so that it is necessary to perform retightening once or twice at the rear of the segment, but most of the one-touch joints cannot be retightened.

[0008] Generally, in the case of a one-touch joint, in the case of a ring joint, the watertight seal can be crushed by the jack thrust, but in the piece joint of the segment forming the ring, the tightening direction is orthogonal to the watertight seal. It is difficult to crush the water seal.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional segment joints, and it is possible to simplify the fastening work and eliminate or simplify the durability. Moreover, it is an object of the present invention to provide a segment joint capable of maintaining the capabilities and advantages of conventional joints such as additional tightening.

[0010]

According to the present invention, the joint surfaces of the male side segment having the bolt and the female side segment having the female thread to be screwed with the bolt are aligned with each other, and the bolt and the female thread are provided. It is a joint structure of a segment that connects both segments by screwing with, and a worm / worm wheel mechanism that rotates a bolt is provided on the male side segment,
The worm / worm wheel mechanism worm wheel is slidably inserted into the worm wheel, and an extrusion mechanism is provided to give the bolt initial pushing force.The worm / worm wheel mechanism worm is formed on the male side segment. By rotating the bolt of the male side segment by rotating it with the tightening jig inserted from the hole, the joint structure of the segment that connects both segments by screwing the bolt to the female screw of the female side segment .

A screw mechanism or a spring mechanism can be adopted as a means for applying an initial pushing force to the bolt of the male side segment.

When the joint surfaces of the assembled segment are aligned with the existing segment, the fastening jig is inserted through the fastening hole formed in the male segment, and the worm / worm wheel mechanism is rotated, the direction of the rotational force is changed. , The bolt rotates.

By the initial pushing force by the initial rotation,
The bolt of the male side segment is pushed out to the female screw side of the female side segment, the bolt is screwed into the female screw, and the rotational force is maintained as it is.

The fastening is completed when a predetermined torque (bolt tightening force) is secured. Hereinafter, the same operation is performed to conclude the segments.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described by taking as an example the case of forming a ring by connecting segment pieces made of RC.

Although FIG. 5 shows a segment piece, the present invention is also applied to a ring joint of a ring in which the segment piece is formed in a ring shape, and hence is hereinafter referred to as a male side segment and a female side segment.

FIGS. 1 to 4 show a first embodiment of the present invention, in which a male side segment 1 having a male screw and a female side segment 2 having a female screw are connected to each other to form a ring. .

Although not shown in the drawing, a female screw is provided on the opposite side of the male side segment 1 and a male screw is provided on the opposite side of the female side segment 2.

A bolt case 3 is embedded in the male side segment 1, and an anchor bar 4 made of deformed rebar is welded to the bolt case 3.

Inside the bolt case 3, a bolt 5 serving as a male screw is provided, and a male screw 6 integrally provided in the middle thereof is provided with a female screw 7 integrally provided in the inner middle of the bolt case 3.
The bolt 5 is screwed onto the bolt 5 to give an initial pushing force to the bolt 5.

Inside the bolt case 3, behind the female screw portion 7, there are provided worm / worm wheel mechanisms 8 and 9 for rotating the bolt 5, and the worm wheel 9 of the worm / worm wheel mechanism is bolted to the worm wheel 9. The hexagonal portion 5b of 5 is inserted so as to be rotatable and slidable.

A fastening hole 10 is formed in the male side segment 1, and a hexagonal rod 11 is inserted in the worm 8 of the worm / worm wheel mechanism.
Insert a fastening tool such as a hexagonal wrench from 0 to insert the hexagonal rod 11
The worm 8 is rotated via the worm wheel 9, and then the worm wheel 9 is rotated, the direction of the rotational force is changed, and the bolt 5 is rotated.

An insert anchor 12 made of deformed reinforcing bar is embedded in the female side segment 2, and a female screw 13 is formed at the tip portion thereof, and the female screw 13 has the female screw 13 of the bolt 5 of the male side segment 1. The male screw part 5a is screwed. Reference numeral 14 is a waterproof seal.

The segment assembly procedure will be described below.
FIG. 1 shows just before the joint is fastened, the joint surfaces of the assembled segment are aligned with the existing segment, the fastening jig is inserted from the fastening hole 10 of the male side segment 1, and the worm / worm wheel mechanisms 8 and 9 are rotated. Let

Then, by the initial pushing force by the male screw 6 on the bolt 5 side and the female screw 7 on the bolt case 3 side,
The bolt 5 is pushed toward the female screw 13 side of the female side segment 2, the male screw portion 5a is screwed into the female screw 13, and the rotational force is maintained as it is.

Fastening is completed when a predetermined torque (bolt fastening force) is secured. FIG. 2 shows the joint after fastening.

The same operation is repeated to connect the segment pieces to form a segment ring. Fastening hole 10
Is closed by mortar filling or the like.

In the above fastening operation, the misalignment error between the segments is due to the play between the bolt case 3 and the bolt 5.
Alternatively, rubber or the like is wound around the dotted line portion in FIG. 1 and the female side segment 2 is swung due to the movement to absorb the rubber.

If the hexagonal bar 11 is not a hexagonal convex screw but a hexagonal concave screw as shown in FIG. 4, the fastening hole 10 becomes thin, and when the mortar is filled later for corrosion protection, the filling portion volume is small and it is inexpensive. Becomes

6 and 7 show a second embodiment of the present invention, in which a male screw 5c and a female screw 7a for giving an initial pushing force to the bolt 5 are attached to the rear end of the bolt 5 and the rear end of the bolt case 3. This is an example in which the stopper member 15 is fixed to the intermediate portion of the bolt 5 and is provided at the portion, and the operation is not particularly different from that of the previous embodiment.

FIGS. 8 and 9 show a third embodiment of the present invention, in which the gear case 16 of the worm / worm wheel mechanism 8, 9 is provided outside the bolt case 3, and the initial pushing force applied to the bolt 5 is provided. It is given by the disc spring 17. At this time, the disc spring gives an initial pushing force, and if a repulsive force can be given, a coil spring,
The shape and material such as rubber and resin do not matter.

FIG. 10 shows the gear case 16 and the worm.
An exploded perspective view of the worm wheel mechanisms 8 and 9 is shown. Further, as shown in FIGS. 8 and 9, the insert anchor 12 embedded in the female side segment 2 has a forked end.

When the joint surfaces of the segments 1 and 2 are aligned,
The disc spring 17 once pushes the tip of the bolt 5 to generate a repulsive force. Other operations are not different from those of the previous embodiment.

As described above, the present invention can be applied not only to RC segments but also to steel segment joints, and also to ring joints of rings in which segment pieces are assembled in a ring shape. It is a thing.

[0035]

(1) Simplification of fastening work No need to bring in fastening parts such as bolts, nuts, washers, etc. No fastening jig (tool) on the pressing side is required, and only one fastening jig is required. It is only necessary to apply the rotational force with an electric tool or the like, and the fastening work is simplified.

(2) Durability is not required or simplified Since there is no exposed metal fitting on the inner surface of the segment, one small fastening hole (tightening jig) is provided for each set of facing joints as required for durability. The hole into which is inserted may be capped (made of rubber, plastic, etc.) or filled (mortar, resin, etc.). Pre-coating treatment (plating treatment, dacrotization treatment) of fastening parts is not required, and it is lower in cost than the conventional joint with corrosion protection.

(3) Maintaining the capabilities and advantages of conventional joints Even if the fastening work is simplified, it is possible to perform additional tightening, and it is possible to crush the waterproof seal material by tightening bolts, which is relatively difficult with one-touch joints. Is. Since the joint does not require high manufacturing accuracy, it is less expensive than the one-touch joint.

By the above (1) to (3), it is possible to improve the safety, and it is possible to shorten the construction period and the construction cost by the high-speed assembly of the segment, and shorten the construction period and the construction cost by omitting the secondary lining. Become.

[Brief description of drawings]

FIG. 1 is a side view of a segment joint according to a first embodiment of the present invention, showing a joint joint just before fastening.

FIG. 2 is a side view of the segment joint according to the first embodiment of the present invention, showing a state after joint fastening.

FIG. 3 is a cross-sectional view of a worm / worm wheel portion that rotates a male screw of a male side segment.

FIG. 4 is a cross-sectional view of another example of the worm / worm wheel portion that rotates the male screw of the male side segment.

FIG. 5 is a perspective view of a segment piece.

FIG. 6 is a side view of the segment joint according to the second embodiment of the present invention, showing a joint joint just before fastening.

FIG. 7 is a side view of the segment joint according to the second embodiment of the present invention, showing the joint joint after fastening.

FIG. 8 is a side view of a segment joint according to a third embodiment of the present invention, showing a joint joint immediately before fastening.

FIG. 9 is a side view of the segment joint according to the third embodiment of the present invention, showing the joint joint after fastening.

FIG. 10 is an exploded perspective view of a worm / worm wheel mechanism that rotates a male screw of a male side segment.

[Explanation of symbols]

1 ... Male side segment 2 Female segment 3 ... Bolt case 4 ... Anchor muscle 5 ... bolt 6-Male screw 7 ... female screw 8 ... worm 9 ... worm wheel 10 ... Fastening hole 11 ... Hexagonal bar 12 ... Insert anchor 13-female screw 14 ... Water seal 15 ... Stopper member 16 ... Gear case 17-Disc spring

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoro Ueda 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Osamu Furusawa 1-56 Shinkoiwa, Katsushika-ku, Tokyo 15 (56) Reference JP-A-8-333992 (JP, A) JP-A-9-177492 (JP, A) JP-B-62-42165 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/08 E21D 11/04

Claims (5)

(57) [Claims] 1. A joint surface between a male segment having a bolt and a female segment having a female screw to be screwed with the bolt is fitted together, and both segments are connected by screwing the bolt and the female screw. In the joint structure of the segment, the male side segment is provided with a worm / worm wheel mechanism for rotating the bolt, and the bolt is rotatably and slidably inserted through the worm wheel of the worm / worm wheel mechanism. The worm / worm wheel mechanism worm is rotated by the tightening jig inserted from the hole formed in the male side segment to rotate the male side segment bolt, and the bolt is rotated. The segment is characterized by connecting both segments by screwing the Ment joint structure. 2. The segment joint structure according to claim 1, wherein the initial pushing force of the bolt of the male side segment is given by a screw mechanism. 3. The segment joint structure according to claim 1, wherein an initial pushing force of the bolt of the male side segment is provided by a spring mechanism. 4. The segment joint structure according to claim 1, wherein the segment joint structure is a piece joint structure in which segment pieces are connected to form a ring. 5. The joint structure for a segment according to claim 1, which is a ring joint structure for connecting the rings of the segments.