JP2000240398A - Joint structure of segments - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure of segments which enables easy execution of an assembling operation. SOLUTION: This joint structure of segments has a constitution wherein a joint plate 3 provided on the joining end face of one segment 1 is inserted into a recess 4, 5 of the other segment 1 and further wherein a joint screw 15 is driven into a sleeve 12 of the recess 4, 5 from the inner peripheral surface side of the segment 1 and made to engage with an engaging hole 8 of the joint plate 3 and thereby the two segments 1 are joined to each other.

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 to construct a shield tunnel.

[0002]

2. Description of the Related Art As is well known, a shield method excavates a ground with a shield excavator, and a plurality of segments are formed in a skin plate of the shield excavator in a circumferential direction of a tunnel to be constructed (referred to as " This is a method of constructing a tunnel by joining them together in the direction between the segments and in the direction of extension of the tunnel (this is called between the rings).

[0003] When joining segments together,
Joint structures using bolts and nuts have been widely used. In order to attach bolts and nuts, a space called a so-called bolt box is formed at the ends of both segments.

[0004]

However, in the conventional segment joint structure as described above, it is necessary to fill the bolt box with a filler such as mortar after completion of the joining of the segments, which is troublesome and costly. There is such a problem. SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and has as its object to provide a joint structure of a segment in which an assembling operation can be easily performed and a hole in a box can be easily filled.

[0005]

The invention according to claim 1 is
A joint structure of a segment lining a tunnel, wherein one of segments adjacent to each other is provided with a joint plate projecting toward the other segment at a joint end face with the other segment. A concave portion for inserting the joint plate is formed on the joint end surface of the other segment, and the other segment is inserted into the concave portion from the inner peripheral surface side of the joint plate, Can be attached, and both of these segments are
By inserting the joint plate of the one segment into the other concave portion and engaging the pin with the joint plate, the joint plates are joined to each other by joining their joint end surfaces. And

[0006] Thus, the joint plate of one segment is inserted into the recess of the other segment to bring the two joint end faces into contact with each other, and furthermore, the pin is engaged with the joint plate, whereby the two segments are joined. Can be joined together. Moreover, the concave portion does not need to be formed so as to be exposed on the inner peripheral surface side of the segment, and only a hole for inserting a pin may be formed on the inner peripheral surface side of the segment.

According to a second aspect of the present invention, in the segment joint structure according to the first aspect, an engagement hole for engaging the pin is formed in the joint plate, and A wedge portion is formed on an inner peripheral surface of the inner peripheral surface so as to contact the side surface of the pin.

As a result, the wedge portion cuts into the pin inserted into the engagement hole, thereby exerting an effect of preventing the pin from falling off.

The invention according to claim 3 is the invention according to claim 1 or 2
The joint structure of the segment, wherein the other segment is provided with a cylinder extending from the inner peripheral surface side to the inside of the recess in order to allow the pin to pass through the inside of the recess. A screw portion is formed on each of the peripheral surface and the outer peripheral surface of the pin.

Thus, the pin can be inserted only by screwing it into the cylinder.

According to a fourth aspect of the present invention, there is provided the segment joint structure according to the third aspect, wherein the cylindrical body is fixed by welding to a joint plate provided on the joint end face. It is characterized by.

Thus, a hole for inserting a pin into the other segment can be easily formed.

[0013]

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

As shown in FIG. 1, each segment 1 has
On the four sides, joining end surfaces 2A and 2B for joining the segment 1 between other segments 1 and the ring, and joining end surfaces 2C and 2D for joining between the segments are formed.

Joint end surfaces 2A and 2 serving as joints between rings
Among B, a plurality of joint plates 3 are installed at predetermined positions on the joint end face 2A on the wellhead side, and a position corresponding to the joint plate 3 on the joint end face 2A on the joint end face 2B on the face side. , A recess 4 is formed.

Further, one of the joining end faces 2C and 2D serving as joints between the segments 1
C, a plurality of joint plates 3 are installed at predetermined positions, and the other joint end face 2D has a joint end face 2C.
A concave portion 5 is formed at a position corresponding to the joint plate 3.

As shown in FIG. 2, the joint plate 3
Is a plate-like member having a base end 3a welded to a joint plate 7 provided at a predetermined position on the joint end surface 2A of the segment 1 and extending in a direction perpendicular to the joint end surface 2A. is there. The joint plate 3 has a tip 3b
Have a substantially trapezoidal shape in plan view, and are formed such that the width thereof decreases toward the distal end portion 3b.

The joint plate 3 has a substantially trapezoidal engaging hole 8 at a predetermined position in the center thereof. The engagement hole 8 is provided at the distal end 3 of the joint plate 3.
A wedge portion 9 having a wedge-like cross section is formed on one side of the b side so that the outer peripheral surface end is protruded from the inner peripheral surface end of the segment 1.

The recess 4 formed in the joint end face 2B is formed with an opening on the back side of the joint plate 10 formed at a predetermined position on the joint end face 2B, and the joint plate 3 is inserted into the joint plate 10. Is formed. The recess 4 is not exposed on the inner and outer peripheral surfaces of the segment 1.

Further, as shown in FIGS. 2 (b) and 3, the concave portion 4 is provided with a cylindrical sleeve (cylindrical body) 12 penetrating from the inner peripheral surface side of the segment 1 to the concave portion 4. ing. The sleeve 12 is provided by welding on the back surface side of the joint plate 10, and has a threaded portion (not shown) formed on an inner peripheral surface thereof.

On the other hand, as shown in FIG. 2B, the recess 5 formed in the joint end face 2D is similar to the recess 4 in that the joint plate 1 with the slit 11 'provided in the joint end face 2D.
The difference is that the joint plate 3 is formed on the rear side of the segment 0 'so that the joint plate 3 to be inserted can slide in the direction between the rings of the segment 1 as shown in FIG. And the slits 11 ′) are formed longer in the direction than the recesses 4 (and the slits 11). In the recess 5, the sleeve 12 is provided at a predetermined position on the side near the joining end surface 2 </ b> A of the recess 5.

As shown in FIG. 2, in order to join the joint plates 3 and the segments 1 and 1 provided with the concave portions 4 and 5, the joint plate 3 of one segment 1 is connected to the segment 1 of the other segment. Into the recess 4 or 5 from the slit 11 or 11 'formed in the joint plate 10 or 10'
Match each other. Then, from the inner peripheral surface side of the segment 1, a sleeve 12 having a screw portion (not shown)
A joint screw (pin) 15 having a screw portion (not shown) formed on the outer peripheral surface is screwed. Then, the joint screw 15 has its tip end projecting into the recesses 4 and 5 and the joint plate 3
Is inserted into and engaged with the engaging hole 8 formed.

As a result, the joint screw 15 and the joint plate 3 are engaged with each other, and the two segments 1 are joined together. At this time, the wedge portion 9 of the joint plate 3 is engaged with the joint screw 15 to ensure the engagement between the joint screw 15 and the joint plate 3.

In FIG. 2B, what is indicated by reference numeral 16 is a sealing material made of, for example, rubber, which is mounted between the two joining end surfaces.

Next, a method for assembling such a segment 1 will be described. In FIG. 1, segment 1
A, 1A,... Have already been assembled for one ring.

In order to newly assemble the next ring segment 1B behind the segment 1A, the joint plate 3 formed on the joint end face 2A of the segment 1B is joined to the already installed segment 1A. This is performed by inserting the joint screws 15 into the respective recesses 4 formed in the end face 2B and further screwing the joint screws 15 into the sleeves 12 of the respective recesses 4.

Next, the segment 1C is joined between the segments at a position adjacent to the segment 1B in the circumferential direction. First, each joint plate 3 formed on the joint end surface 2C of the segment 1C is inserted into a slit 11 '(see FIG. 2) of each concave portion 5 formed on the joint end surface 2D of the segment 1B. In this case, the segment 1
In order to prevent the joint plate 3 of the joint end face 2A of C from interfering with the existing segment 1A, the joint plate 3 of the joint end face 2C is inserted into the slit 11 '(see FIG. 2) at the end of the recess 5 on the joint end face 2B side. insert.

After the joining end face 2C of the segment 1C is brought into contact with the joining end face 2D of the segment 1B, the segment 1C is slid toward the segment 1A as it is. Then, the joining end face 2C of the segment 1C
Each of the joint plates 3 slides toward the segments 1A, 1A,... In each of the concave portions 5 of the segment 1B. Accordingly, the joint end face 2A of the segment 1C approaches the joint end face 2B of the existing segment 1A, and the joint plate 3 of the segment 1C is
1 (see FIG. 2). When the joint end surface 2A of the segment 1C comes into contact with the joint end surface 2B of the segment 1A, the joint plate 3 is completely inserted into the concave portion 4, so that the joint plate 3 is connected to the sleeve 12 of each concave portion 4 between the segments 1A and 1C. The screw 15 (see FIG. 2B) is screwed in to join the joint plate 3. Further, between the segments 1C and 1B, the joint screws 15 (see FIG. 2B) are screwed into the sleeves 12 of the respective concave portions 5 to join the joint plates 3 to each other. As a result, the segment 1C is joined to the segments 1A and 1B between the rings and between the segments. Thereafter, as shown in FIG. 2B, a mortar 18 and the like are filled to fill the ends of the sleeves 12 and the joint screws 15 exposed on the inner peripheral surface side of each segment 1.

Thereafter, the above operation is repeated to join a predetermined number of segments 1 in the ring direction.

According to the segment joint structure described above,
The joint plate 3 of one segment 1 is inserted into the recesses 4 and 5 of the other segment 1 and joint screws 15
By screwing into the sleeves 12 of the recesses 4 and 5 to engage with the engagement holes 8 of the joint plate 3, the two segments 1 and 1 can be easily joined to each other, so that work efficiency can be improved. Thus, the construction period can be shortened and the construction cost can be reduced.

Moreover, since the joint screw 15 can be tightened from the inside of the segment 1, that is, from the inside of the tunnel, the joining work of the segment 1 can be performed very easily.

In addition, the recesses 4 and 5 are not exposed on the inner peripheral surface side of the segment 1, and only the end of the sleeve 12 for inserting the joint screw 15 is provided on the inner peripheral surface side of the segment 1. It has an exposed configuration. Therefore, after the joint screw 15 is inserted, only this portion needs to be coked with the mortar 18 or the like, so that the coking amount can be minimized, the operation can be performed easily, and the labor and cost can be reduced.

The joint plate 3 has an engaging hole 8.
Is formed, and the wedge portion 9 is formed in the engagement hole 8. Therefore, the wedge portion 9 is inserted into the joint screw 15 inserted into the engagement hole 8.
As a result, the joint screw 15 can be prevented from falling off, and the joining between the segments 1 and 1 can be made more reliable.

Further, since the sleeve 12 for inserting the joint screw 15 is integrally welded to the joint plates 10 and 10 ', the engagement hole 8 for inserting the joint screw 15 can be easily formed. Can be formed. In addition, since the joint screw 15 and the engagement hole 8 each have a screw portion and are screwed to each other, the joint screw 15
By simply screwing the joint screw into the sleeve 12, the insertion can be completed and the operation can be performed easily and reliably.
5 is prevented from falling off.

Such a joint structure has a very simple structure, uses a small number of members, and is easy to manufacture, so that the above effects can be obtained at low cost. Also,
The same joint structure using the joint plate 3 and the joint screw 15 can be applied to the joint portions of the segments 1 and 1 adjacent to each other between the rings and between the segments, which also contributes to cost reduction. Can be.

Further, since the distal end of the joint plate 3 is formed in a trapezoidal shape, it can be easily and reliably inserted into the recesses 4, 5 from the slits 11, 11 'formed in the joint plates 10, 10'. It can be carried out.

In the above-described embodiment, after the joint screw 15 is screwed in, the end thereof is filled with the mortar 18, but the material to be used is not limited to the mortar 18, and other materials may be used as appropriate. You may. Also,
The shape of the wedge portion 9 is not limited to the shape described above, and may be appropriately changed to another shape, or may be omitted if unnecessary. Further, although the joint screw 15 is screwed into the sleeve 12, the pin may be formed as a simple pin to form a groove, a concave portion, or the like for making the wedge portion 9 bite into the outer peripheral surface of the pin. is there. Further, the shape of the joint plate 3 and the shape of the engagement hole 8 formed in the joint plate 3 are not limited at all, and other shapes may be adopted. In addition, any material may be used for the joint plates 10, 10 ', the joint plate 3, and the like. Of course, the shape of the segment 1 itself,
Nor does it ask for the material (made of concrete or steel).

Other than this, any configuration may be employed as long as it does not depart from the gist of the present invention, and it is needless to say that the above-described configurations may be appropriately selectively combined. No.

[0039]

As described above, according to the segment joint structure according to the first aspect, the joint plate of one segment is inserted into the concave portion of the other segment to bring the two joint end surfaces into contact with each other. By further engaging the pin with the joint plate, both segments can be joined to each other with one touch. Therefore, the efficiency of the segment assembling work can be improved, and the construction period can be shortened and the construction cost can be reduced. In addition, since only the hole for inserting the pin needs to be formed on the inner peripheral surface side of the segment, as a result,
Compared to the conventional case where the bolt box itself was buried, the amount of caulking can be minimized and work can be performed easily,
The labor and cost can be reduced. The pins are
Since the segment can be inserted from the inside of the segment, that is, from the inside of the tunnel, the joining operation of the segments can be performed very easily.

According to the joint structure of the segment according to the second aspect, the wedge portion bites into the pin inserted into the engagement hole, thereby preventing the pin from falling off, and more securely joining the segments. It can be.

According to the joint structure for a segment according to the third aspect, the other segment is provided with a cylindrical body extending from the inner peripheral surface side to the inside of the recess, and is provided on the inner peripheral surface of the cylindrical body and the outer peripheral surface of the pin. Since the respective screw portions are formed, the insertion of the pins is completed only by screwing the pins into the cylindrical body, so that the operation can be performed easily and reliably, and the pins are prevented from falling off.

According to the joint structure of the segment according to the fourth aspect, the tubular body is fixed by welding to the joint plate on the joint end face. Thereby, a hole for inserting the pin into the other segment can be easily formed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a method for assembling a segment to which a segment joint structure according to the present invention is applied.

FIGS. 2A and 2B are diagrams showing a joint portion between segments to which the segment joint structure is applied, wherein FIG. 2A is a sectional view taken along the line II in FIG. 2B and FIG. .

FIG. 3 is a cross-sectional view of the roll shown in FIG. 2 (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Segment 2A, 2B, 2C, 2D Joining end face 3 Joint plate 4, 5 Depression 8 Engagement hole 9 Wedge part 10, 10 'Joint plate 12 Sleeve (cylindrical body) 15 Joint screw (pin)

Claims (4)

[Claims] Claims: 1. A joint structure of a segment for lining a tunnel, wherein:
One segment is provided with a joint plate projecting toward the other segment on a joint end surface with the other segment, and a concave portion for inserting the joint plate is provided on the joint end surface of the other segment. The other segment is inserted into the recess from the inner peripheral surface side of the other segment, and a pin that engages with the joint plate can be attached to the other segment. By inserting the joint plate into the other concave portion and engaging the pin with the joint plate, the joint end surfaces thereof are joined to each other by abutting each other. Joint structure. 2. The joint structure for a segment according to claim 1, wherein an engagement hole for engaging the pin is formed in the joint plate, and the engagement hole has an inner peripheral surface formed on the joint plate. A joint structure for a segment, wherein a wedge portion abutting on a side surface of the pin is formed. 3. The joint structure for a segment according to claim 1, wherein the other segment has a cylindrical body extending from an inner peripheral surface side to the inside of the concave portion so that the pin is inserted into the concave portion. And a threaded portion is formed on an inner peripheral surface of the cylindrical body and an outer peripheral surface of the pin, respectively. 4. The segment joint structure according to claim 3, wherein said tubular body is fixed by welding to a joint plate provided on said joint end face. Joint structure.