JP3558427B2 - Tapered plate segment temporary mounting method and temporary mounting jig - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a method for connecting segments adjacent to each other in the axial direction of a tunnel in a curved portion of a tunnel using connection bolts with a tapered plate segment interposed therebetween, when connecting with one segment. TECHNICAL FIELD The present invention relates to a taper plate segment temporary mounting method for temporarily mounting a tapered plate segment and a temporary mounting jig.
[0002]
[Prior art]
Conventionally, the following method has been used to temporarily mount this type of tapered plate segment.
First, for each segment (hereinafter, referred to as a “first segment”) that constitutes a ring-shaped segment that has already been installed, similarly-divided tapered plate segments are connected in a tube-like manner, that is, in the tunnel axis direction. The two members are arranged not in a staggered pattern but in a completely overlapped state, and a temporary fixing bolt is inserted through the tapered plate segment and the segment connecting portion of the first segment to temporarily mount the two.
[0003]
[Problems to be solved by the invention]
However, the conventional connection method has the following problems.
By the above temporary mounting, the taper plate segment is temporarily mounted over the entire circumference of the tunnel to form a taper ring. Thereafter, on the open side surface of the taper ring, the propulsion mechanism of the tunnel excavator is used. A jack is abutted. That is, the tapered ring serves as a reaction force receiving portion for the excavator to advance.
However, as a result of using the above-mentioned conventional connection method, the head or the nut portion of the temporary fixing bolt protrudes in various places on the side surface of the tapered ring, so the jack had to be fixed avoiding this portion. . As a result, some of the jacks provided in the excavator cannot be used, so that the operation management of the excavator becomes complicated, or the inability of the excavator to take full advantage has arisen. Further, after the excavation is completed for a predetermined distance, the jack is removed and the next segment (hereinafter, referred to as “second segment”) is connected to the taper ring. Therefore, it was necessary to remove temporary fixing bolts, that is, so-called "bolt replacement".
This refilling operation is not only troublesome in itself, but also must be performed while holding the tapered plate segment so as not to cause a positional shift between the tapered plate segment and the first segment. In addition, the operation becomes complicated, and the tapered plate segment may fall, so there is room for improvement in safety.
In the conventional connection method, the tapered plate segment and the second segment are aligned with each other while performing such a rearrangement work, and a second connection bolt is inserted to connect the second segment.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a method for temporarily mounting a tapered plate segment and a temporary mounting jig which solve the above-mentioned drawbacks of the prior art, have high working efficiency, and are excellent in safety.
[0005]
[Means for Solving the Problems]
(Configuration 1)
Characterized means of the present invention for achieving this objective, as set forth in claim 1, the jig body having a segment-side mounting portion with respect to the first segment, and a plate-side mounting portion for the tapered plate segments, and wherein The plate-side mounting portion of the temporary mounting jig is tapered by using a temporary mounting jig that is mounted on the segment-side mounting portion and that includes an engaging member that engages with the segment connecting portion of the first segment. After being detachably attached to the inner peripheral end face of the plate segment, the tapered plate segment is inserted into the engagement member and the tapered plate segment so as to sandwich the segment connecting portion, and the engagement member Are disposed so as to be positioned in connection bolt insertion holes provided in the segment connection portion, and the engagement member is connected to the connection bolt. It lies in engaging the insertion hole for the belt.

[0006]
(Action / Effect)
According to the tapered plate segment temporary mounting method of the present invention, the plate-side mounting portion of the jig main body is attached to the inner peripheral end surface of the tapered plate segment, and the segment-side mounting portion of the jig main body is formed of the first segment. It engages with the connection bolt insertion hole formed in the segment connection portion via the engagement member.
For this reason, there is no protrusion on the side of the taper plate segment on the side that comes into contact with the second segment, and there is no obstacle in arranging the jack of the excavator.
Further, when connecting the next second segment, the second segment is disposed in contact with the tapered plate segment while the jig body is temporarily attached to the tapered plate segment, and an unused connection bolt is used. Fully tighten the bolts and nuts first from the insertion holes. Then, after the second segment is constructed in a ring shape, the jig body is removed from the tapered plate segment, and thereafter, the remaining connection bolts including the connection bolt insertion holes in which the temporary mounting jigs are mounted. The connection work is completed by fully tightening the insertion hole.
Thus, according to the method of the present invention, the temporary attachment of the tapered plate segment to the first segment can be efficiently performed in a short time. Moreover, since the connection bolt insertion hole is used for the temporary mounting, the position of the tapered plate segment can be accurately adjusted.
And since there is no need to change the jig body, there is no danger of the tapered plate segment dropping, and the operation can be performed safely. In addition, the connection operation itself of the next second segment can be easily performed in a short time. .
Further, since all jacks of the excavator can be used, the operation management of the excavator becomes easy.
As described above, according to the present method, the efficiency and safety of the entire segment connection operation can be significantly improved.
[0007]
(Configuration 2)
In order to implement the taper plate segment temporary mounting method of the present invention, a taper plate segment temporary mounting jig is configured as described in claim 2.
That is, a jig main body having a segment-side attachment portion for the segment connection portion of the first segment, and a plate-side attachment portion detachably attached to an inner peripheral end surface of the tapered plate segment, and the segment-side attachment portion And a taper plate segment temporary mounting jig is formed so as to include an engaging member which is mounted on the segment connecting portion and is engaged with the connection bolt insertion hole of the segment connecting portion.
[0008]
(Action / Effect)
According to the tapered plate segment temporary mounting jig of this configuration, as described above, the efficiency and safety of the entire segment connecting operation can be significantly improved only by using a jig having a simple structure.
[0009]
(Configuration 3)
The tapered plate segment temporary mounting jig of the second aspect may be configured as described in the third aspect.
That is, the engaging member is a threaded portion that is screwed into the jig body, an engagement portion that engages with the connection bolt insertion hole, and a peripheral portion of the connection bolt insertion hole is positioned on the side of the tapered plate segment. And a pressing portion that presses the pressing portion.
[0010]
(Action / Effect)
According to the tapered plate segment temporary mounting jig of the present configuration, the engaging member is movable in the perspective direction with respect to the tapered plate segment, so that the engaging member is pinched between the engaging member and the tapered plate segment. Even if the width of the segment connecting portion of the first segment changes slightly, the tapered plate segment can be securely temporarily mounted.
Further, when the pressing portion of the engaging member presses the peripheral portion of the connection bolt insertion hole toward the tapered plate segment, the engaging portion formed at the distal end of the engaging member is used for the connection bolt. Since the engagement member is engaged with the insertion hole, the engagement member does not shift during the screwing of the engagement member.
Then, the taper plate segment is pulled into the first segment side by screwing the engagement member, and the taper plate segment can be securely held by contacting the two without play.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
As shown in FIG. 1, the tapered plate segment temporary mounting method and the temporary mounting jig of the present invention are arranged between two rings r using a normal segment S whose both end surfaces in the tunnel axis X direction are parallel. The taper ring R in which the thickness of each portion in the circumferential direction is changed so that these rings r have an angle along the curve of the tunnel is used.
[0013]
For example, the tapered ring R includes seven tapered plate segments T as shown in FIG. In the thickness distribution of the taper ring R, the center of curvature of the tunnel is formed to be thinnest, while the side opposite to this by 180 degrees is formed to be thickest.
The tapered plate segment T is made of, for example, ductile cast iron such as FCD500 and has an outer diameter of 7050 mm, an inner diameter of 6550 mm, a thinnest portion having a thickness of 24.5 mm, and a thickest portion having a thickness of 65 mm. 0.5 mm.
As shown in FIG. 3, the tapered plate segment T is formed with connection bolt insertion holes 1A dispersed in the circumferential direction. The connection bolt insertion hole 1A is formed of, for example, a 35 mmφ drill hole.
On the inner peripheral end surface 2 near the center in the longitudinal direction of the tapered plate segment T, a transport suspending portion 3 for facilitating transport of the tapered plate segment T is provided. The transport suspending portion 3 is provided on the inner peripheral side end surface 2 by integral molding or by a suspending portion mounting bolt or the like. However, the transport hanging part 3 is removed after the completion of the tunnel.
The taper plate segment T is spliced to the first segment S1 already formed in a ring shape by using a taper plate segment temporary mounting jig J (hereinafter, referred to as “temporary mounting jig J”).
[0014]
As shown in FIG. 4, the temporary mounting jig J includes a jig main body 4 and an engaging member 8 that engages and presses the first segment S1.
One end of the jig main body 4 serves as a plate-side mounting portion 5 that is mounted on the inner peripheral end surface 2 of the tapered plate segment T, and the other end has a segment-side mounting with respect to the segment connecting portion 13 of the first segment S1. It functions as the unit 6.
The plate-side mounting portion 5 is fixed to the inner peripheral end surface 2 of the tapered plate segment T using, for example, three jig body fixing bolts 7 of M10. In this state, the tapered plate segment T and the temporary mounting jig J exhibit a substantially U-shape, and the segment connecting portion 13 of the first segment S1 is located inside the U-shape. Will be done. The jig body 4 is configured such that the plate-side mounting portion 5 does not protrude from the side surface of the tapered plate segment T on which the second segment S2 is mounted. The jig main body 4 is made of a normal steel material such as SS400.
The engaging member 8 is screwed to the segment-side mounting portion 6. The engaging member 8 includes a screw portion 9 that is screwed into the jig main body 4, an engagement portion 10 that engages with the connection bolt insertion hole 1 </ b> B of the first segment S <b> 1, and a connection bolt insertion hole 1 </ b> B. And a pressing portion 11 for pressing the peripheral portion toward the tapered plate segment T. The material of the engaging member 8 is also made of ordinary steel such as SS400 similarly to the jig main body 4. The screw portion 9 is formed in an M39 bolt shape, for example.
The engagement portion 10 engages with the connection bolt insertion hole 1B, and positions the tapered plate segment T without looseness with respect to the first segment S1. Therefore, the outer diameter of the engaging portion 10 is desirably slightly smaller than the inner diameter of the connection bolt insertion hole 1B.
In order to facilitate the engagement with the segment connecting portion 13, the distal end of the engaging portion 10 may be formed in a tapered shape.
Further, the length of the engaging portion 10 in the axial direction is preferably longer in order to securely engage with the connection bolt insertion hole 1B. However, if it is too long, the pressing portion 11 described later will The stroke before contacting the peripheral edge of the bolt insertion hole 1B is lengthened, and it takes time and effort to mount the bolt, which is not preferable.
The pressing portion 11 is in contact with a peripheral portion of the connection bolt insertion hole 1 </ b> B, and draws the tapered plate segment T toward the segment connection portion 13 as the engagement member 8 advances. It is. Since the pressing surface of the pressing portion 11 is formed so as to be perpendicular to the axial direction of the engaging member 8, the engaging member 8 bites into the connection bolt insertion hole 1B. It doesn't get stuck.
[0015]
(Mounting order)
The procedure for attaching the tapered plate segment T and the second segment S2 to the first segment S1 constructed in a ring shape is generally as follows, and the state is shown in FIGS. 1, 5, and 6. .
In addition, the taper plate segment T is divided into seven like the first segment S1, and is connected to the first segment S1 in a tube-like manner.
First, the tapered plate segment T is attached to the segment connecting portion 13 of the first segment S1 using the temporary attachment jig J. That is, the tapered plate segment T, to which the temporary attachment jig J is attached at two positions, is brought close to the segment connection portion 13 and the engagement portion 10 of the engagement member 8 is inserted into the connection bolt insertion hole 1B. Position. At this time, the engaging member 8 is kept in a retracted state, and the interval between the tapered plate segment T and the engaging portion 10 is set wide. Then, the engaging member 8 is screwed toward the tapered plate segment T side, the pressing portion 11 presses the peripheral portion of the connection bolt insertion hole 1B, and the tapered plate segment T is connected to the segment connecting portion 13 side. And temporarily attach them.
In this way, the tapered plate segment T is temporarily mounted sequentially over the entire circumference of the tunnel, and a tapered ring R is formed by the tapered plate segment T.
Next, the propulsion jack 15 of the excavator 14 is set on the tapered ring R, and the tapered ring R is used as a reaction force receiving portion of the excavator 14 to excavate a tunnel. At this time, since the temporary mounting jig J does not protrude from the open side surface of the tapered plate segment T to the second segment S2 side, the disposition of the propulsion jack 15 can be performed without any trouble.
[0016]
After excavating a predetermined distance, the propulsion jack 15 is removed from the tapered ring R, and the second segment S2 is connected to the tapered ring R sequentially.
As shown in FIG. 6, the second segment S2 is staggered with respect to the first segment S1, and the connection bolt insertion holes 1A and 1B of the taper plate segment T and the first segment S1 are respectively provided. And the connection bolt insertion hole 1B of the second segment S2.
From the portion of the connection bolt insertion holes 1A and 1B where the temporary mounting jig J is not engaged, the final fastening is performed using the connection bolt 12 of M30.
Further, the butted portions of the second segments are also fully tightened using the connection bolts 12.
At least at the stage where the final fastening is completed until none of the second segments S2 fall off, the temporary mounting jig J is removed, and the remaining connection bolt insertion holes 1A and 1B are fully tightened.
Removal of the temporary mounting jig J is performed by removing the jig main body fixing bolt 7 that fixes the jig main body 4 to the tapered plate segment T.
[0017]
The connection construction of the segments S1 and S2 is performed according to the above-described procedure. However, according to the taper plate segment temporary mounting method of the present invention, the temporary fixing bolt changing work which is indispensable in the conventional connection method is omitted. This also eliminates the possibility that the tapered plate segment T will fall during the refilling operation. Therefore, work efficiency and work safety in the temporary mounting work of the tapered plate segment T can be greatly improved.
[0018]
[Another embodiment]
In the above embodiment, M10 bolts are used as means for attaching the jig body 4 to the tapered plate segment T. However, the present invention is not limited to this. A configuration in which the taper plate segment T is attracted by magnetic force may be used. With this configuration, the attachment and detachment of the jig main body 4 may be performed more quickly and easily.
[0019]
In the above embodiment, the engagement portion 10 of the engagement member 8 is configured to engage with the insertion bolt insertion hole 1B of the first segment S1, but the invention is not limited to this, and the segment connection portion is not limited to this. 13 may be simply pressed. In short, any configuration may be used as long as the tapered plate segment T can be temporarily mounted on the first segment S1 reliably.
[0020]
In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a curved portion of a tunnel constructed using a tapered plate segment. FIG. 2 is a front view and a plan view of a tapered plate segment constructed in a ring shape. FIG. 3 is a front view of a tapered plate segment. And FIG. 4 is an exploded perspective view showing a procedure for temporarily mounting the tapered plate segment. FIG. 6 is a second segment book. Exploded perspective view showing the tightening procedure [Description of reference numerals]
1B Insertion hole 2 for connection bolt of first segment 2 Inner peripheral end face 4 Jig body 5 Plate side attachment part 6 Segment side attachment part 8 Engagement member 9 Screw part 10 Engagement part 11 Pressing part 12 Connection bolt 13 Segment connection part T Taper plate segment J (taper plate segment) Temporary mounting jig S1 First segment S2 Second segment

Claims (3)

In the curved portion of the tunnel, the first segment (S1) and the second segment (S2) adjacent in the tunnel axis direction are connected to each other with the connection bolt (12) sandwiching the tapered plate segment (T). A taper plate segment temporary mounting method for temporarily mounting the taper plate segment (T) to the first segment (S1) when connecting.
Segment side mounting portion for the previous SL first segment (S1) and (6), wherein the jig main body (4) having a plate-side mounting portion (5) with respect to the tapered plate segment (T), and said segment-side mounting portion Using a temporary mounting jig (J) that is mounted on (6) and that includes an engaging member (8) that engages with the segment connecting portion (13) of the first segment (S1) ,
After the plate-side attachment portion (5) of the temporary attachment jig (J) is detachably attached to the inner peripheral end surface (2) of the tapered plate segment (T),
The tapered plate segment (T) is in a state where the engagement member (8) and the tapered plate segment (T) sandwich the segment connecting portion (13), and the engagement member (8) Are arranged so as to be located in the connection bolt insertion holes (1B) provided in the segment connection portion (13), and the engaging member (8) is engaged with the connection bolt insertion holes (1B). Temporary mounting method of taper plate segment. When connecting the first segment (S1) and the second segment (S2) adjacent to each other in the tunnel axis direction using the connection bolt (12) with the tapered plate segment (T) sandwiched therebetween, A taper plate segment temporary mounting jig for temporarily mounting the taper plate segment (T) on a first segment (S1),
A jig having a segment-side attachment portion (6) for the segment connection portion (13) of the first segment (S1) and a plate-side attachment portion (5) detachably attached to the inner peripheral end surface (2). A temporary taper plate segment mounting jig comprising a main body (4) and an engaging member (8) mounted on the segment side mounting portion (6) and engaged with the connection bolt insertion hole (1B). A screw portion (9) screwed into the jig body (4), an engagement portion (10) engaged in the connection bolt insertion hole (1B), and the engagement member; In order to draw the tapered plate segment (T) toward the segment connecting portion (13) by the screwing of the member (8) itself, the periphery of the connection bolt insertion hole (1B) is moved to the tapered plate segment (T). 3. The jig for temporarily mounting a tapered plate segment according to claim 2, further comprising a pressing portion (11) for pressing the tapered plate segment toward the side of the tapered plate segment.

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