JPH10205287A - Joint construction of segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote the efficiency, work efficiency and quality of segment joint work. SOLUTION: A pin 2 is projected to the end face of one segment 1 of segments 1 and 1 connected to each other, a pin hole 3 is made in the end face of the other segment 1, the outside diameter of the pin 2 is so set that it is slightly larger than the inside diameter of the pin hole, and they are fitted to each other. Then, the pin 2 is formed of material harder than a ring hardware 6 of the pin hole 3, and a groove 5 continued circumferentially is formed on the circumferential surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment joint structure suitable for joining segments when constructing a tunnel.

[0002]

2. Description of the Related Art As is well known, in a shield construction method, while excavating the ground with a cutter device provided at a front portion of a shield excavator having a skin plate having an outer cylindrical shape, an annular body is fixed in a skin plate. This is a method of constructing a tunnel underground by assembling a segment divided into a thickness and a predetermined angle, and further applying a reaction force to the front end of the segment to extend a propulsion jack inside a shield excavator.

[0003] Conventionally, in assembling such a shield method or the like in a drilled pit, a joint structure is used in which adjacent segments are joined with bolts and nuts.

[0004]

However, the conventional segment joint structure as described above has the following problems. First, since the bolts and nuts are tightened manually, they are inefficient and time-consuming, which hinders shortening the construction period. Moreover, it is difficult to make the tightening force uniform by manual work, which hinders the quality improvement of the segment joint. In addition, the joining operation must be performed in a narrow space in the tail seal of the shield machine, and there is a problem that workability is poor. SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and has as its object to provide a segment joint structure capable of improving the efficiency of segment joining work, improving workability, and improving quality.

[0005]

The invention according to claim 1 is
Pins are provided so that pins protrude from the end faces of the segments on one side of the segments joined to each other to cover the tunnel, and a pin hole into which the pins are inserted is formed on the end face of the segment on the other side. The outer diameter of the pin and the inner diameter of the pin hole are set so as to fit each other.

According to a second aspect of the present invention, in the segment joint structure according to the first aspect, the pin is formed of a material harder than a member forming the pin hole.

[0007] The invention according to claim 3 is the invention according to claim 1 or 2.
In the joint structure for a segment described above, a groove that is continuous in a circumferential direction is formed on an outer peripheral surface of the pin.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a segment joint structure according to the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, each segment 1 is provided with a plurality of (for example, two) pins 2 on one end face 1a in the direction in which the tunnel to be constructed is continuous, and the other end face 1b. And the same number of pin holes 3 as the number of pins 2.

As shown in FIG. 2, a pin 2 is attached to one end of a cylindrical sleeve 4 embedded so as to extend in a direction connecting one end face 1a and the other end face 1b of the segment 1.
The base 2a is screwed. The pin 2 has a chamfered distal end 2b, and further has, on its outer peripheral surface, for example, three grooves 5 each having a U-shaped cross section that are continuous in the circumferential direction.

On the other hand, the pin hole 3 is composed of a ring-shaped metal fitting 6 and a holding member 7 for fixing the ring metal 6 to the other end of the sleeve 4.

The holding member 7 has a substantially cylindrical shape, and its base end 7a is screwed to the outer peripheral surface of the other end of the sleeve 4 and further welded. The tip 7 of the holding member 7
The b has a flange 7c projecting inward.

The metal ring 6 is held between the end face of the sleeve 4 and the flange 7c of the holding member 7 via a washer 8 made of, for example, copper or a polymer material. The inner peripheral edge of the ring metal 6 and the flange 7c of the holding member 7 on the other end face 1b side of the segment 1 are chamfered or rounded.

The pin 2 is made of a material harder than the material forming the ring metal 6 of the pin hole 3. Here, for example, the pin 2 is formed of STK40 hardened material, and the ring metal 6 is formed of STK40 material or SSK.
It is formed of 41 materials.

Further, the pin 2 and the ring hardware 6 are
The outer diameter of the pin 2 is set to be slightly larger than the inner diameter of the ring hardware 6 (so-called "tight fit") so that they fit tightly when they are inserted into the ring hardware 6. Here, the inner diameter of the ring hardware 6 is, for example, φ32
mm, the outer diameter of the pin 2 is, for example, φ32 + 0.
It is about 1 mm.

As shown in FIG. 3, in order to join the segments 1 having such pins 2 and pin holes 3,
The pin 2 of the other segment 1 is inserted into the pin hole 3 of the other segment 1. Then, the pin 2 made of a harder material and having a larger diameter is inserted into the ring hardware 6 of the pin hole 3, whereby the ring hardware 6 is deformed and expanded.

The segments 1, 1 joined to each other by inserting the pins 2 into the pin holes 3 in this manner.
Is such that the elastically deformed ring hardware 6 resists the pulling force by the tightening force of the pin 2, and the shearing force is resisted by the pin 2 and the holding member 7.

When assembling the segment 1 having the above joint structure, for example, as shown in FIG. 4, a propulsion jack 11 of a shield excavator 10 is used. That is,
The segment 1 held in a predetermined position by an assembling device or the like (not shown) is pushed toward the previously assembled segment 1 by extending the propulsion jack 11. The segments 1 are joined together by inserting the pins 2 of the segments 1 pushed out by the propulsion jacks 11 into the pin holes 3 of the segments 1 previously assembled.

In the joint structure of the segment 1 described above, of the segments 1 and 1 to be joined to each other, a pin 2 protrudes from an end surface of one segment 1 and a pin hole 3 is formed in an end surface of the other segment 1. The outer diameter of the pin 2 is set to be slightly larger than the inner diameter of the pin hole 3, and these are fitted to each other. As a result, when assembling the segment 1, the pin 2 of the segment 1 to be assembled is inserted into the pin hole 3 of the segment 1 which has been assembled first.
The pins 2 and the pin holes 3 are tightly fitted by simply inserting the segments 1 and 2 into each other, so that the segments 1 and 1 can be closely joined. In this way, the segments 1 and 1 can be easily and surely and evenly joined together with one touch without using bolts and nuts as in the prior art, thereby shortening the construction period and improving the quality of the segment joint. Improvement can be achieved. Further, since it is not necessary to perform the joining operation in a narrow space, the workability can be improved and the safety can be improved.

In addition, in such a joint structure, by pushing the segment 1 with the propulsion jack 11 of the shield excavator 10, the segment 1 is joined to the segment 1 which has been assembled beforehand. The assembly work can be automated, and the number of workers can be reduced.

The pin 2 is connected to the ring hardware 6 of the pin hole 3.
It is configured to be made of a harder material. Thus, when the pin 2 is inserted into the pin hole 3, the ring metal 6
Is elastically deformed and exerts the force to tighten the pin 2,
The segments 1 and 1 can be joined more firmly, and the resistance to tensile force can be increased.

Further, on the outer peripheral surface of the pin 2, grooves 5, 5, 5 which are continuous in the circumferential direction are formed. Thereby, in a state where the pin 2 and the pin hole 3 are tightly fitted,
The ring hardware 6 made of a material softer than the pin 2 has such a form as to bite into the groove 5 of the pin 2, so that the resistance to tensile force can be increased.

In the above embodiment, the pins 2,
Regarding the material of the pin hole 3, the outer diameter, the number of grooves 5, etc.
As long as it does not deviate from the gist of the present invention, an optimal one may be appropriately adopted, and the present invention is not limited to the above. For example, insert pin 2 into pin hole 3
Although it is configured to be formed of a material harder than the member forming the pin hole, the pin hole 3 side may be hardened. In addition, although the groove 5 that is continuous in the circumferential direction is formed in the pin 2, the groove 5 may be, for example, a vertical groove extending in the axial direction of the pin 2 or a thread. Further, also for the sleeve 4, it is not necessary to connect one end face 1a of the segment 1 to the other end face 1b, and the sleeve may be embedded in each of the one end face 1a and the other end face 1b.

Further, the shape and material of the segment 1 itself do not matter at all. In addition, in the above-described embodiment, segment 1 which has been assembled first
Although the pin 2 of the segment 1 to be assembled is inserted into the pin hole 3 of the above, the present invention is not limited to this.
The pin 2 of the assembled segment 1 may be inserted into the pin hole 3 of the assembled segment 1.
Furthermore, in the above-described embodiment, the joint structure of the segment according to the present invention is configured to be applied to the segment of the tunnel constructed by the shield method. Of course, if the segment is used, the method may be applied to a method other than the shield method. It is possible to apply and thereby obtain the same effect as above.

[0025]

As described above, according to the segment joint structure according to the first aspect, pins of the segments to be joined to each other are provided with pins protruding from the end faces of one of the segments, and pins are provided on the end faces of the other segments. A hole is formed, and the outer diameter of the pin and the inner diameter of the pin hole are set so as to fit each other. As a result, when assembling the segment, the pin of one of the segment to be assembled or the segment that has been assembled earlier is inserted into the pin hole of the other segment, so that the pin and the pin hole are tight. And the segments can be tightly joined together. In this way,
Segments can be joined with one-touch without the use of bolts and nuts as in the past and without manual intervention, so segment joining work can be performed easily and reliably, and the joining strength is made uniform. As a result, it is possible to shorten the construction period and improve the quality of the segment joint. Further, since it is not necessary to perform the joining operation in a narrow space, the workability can be improved and the safety can be improved. In addition, in such a joint structure, it is only necessary to push the assembled segment toward the previously assembled segment, for example, using a propulsion jack of a shielded excavator, which also allows the segment to be assembled. Labor saving in assembling work can be achieved.

According to the joint structure of the segment according to the second aspect, the pin is formed of a material harder than the pin hole. Accordingly, when the pin is inserted into the pin hole, a force for tightening the pin can be exerted by elastic deformation on the pin hole side, so that the segments can be more firmly joined.

According to the joint structure of the segment according to the third aspect, the pin has a configuration in which a circumferentially continuous groove is formed on the outer peripheral surface of the pin. Thereby, when the pin and the pin hole are closely fitted, it is possible to exert a high resistance to the force in the direction in which the pin comes off, and thus the segments can be more firmly joined together.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a tunnel construction method to which a segment joint structure according to the present invention is applied.

FIG. 2 is a sectional view showing an example of a segment to which the segment joint structure is applied.

FIG. 3 is a sectional view showing a state where the segments shown in FIG. 2 are joined together.

FIG. 4 is a side sectional view showing a method of using a propulsion jack of a shield excavator as an example of a method of joining the segments.

[Explanation of symbols]

 1 segment 2 pin 3 pin hole 5 groove

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroaki Inoue 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Kazuo Miyazawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation Inside the corporation

Claims (3)

[Claims] 1. A pin is provided so as to protrude from an end face of a segment on one side of segments joined to each other to cover a tunnel, and the pin is inserted into an end face of a segment on the other side. A joint structure for a segment, wherein a pin hole is formed, and an outer diameter of the pin and an inner diameter of the pin hole are set to fit each other. 2. The segment joint structure according to claim 1, wherein said pin is formed of a material harder than a member forming said pin hole. 3. The joint structure for a segment according to claim 1, wherein a groove that is continuous in a circumferential direction is formed on an outer peripheral surface of the pin.