JP3177054B2 - Connection structure between segment and tie rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arcuate plate-shaped segment which is joined to form a wall of an elliptical tunnel and a tie rod for connecting the segments.

[0002]

2. Description of the Related Art In recent tunnel construction methods, while excavating the ground with a shield machine, arc-shaped segments (generally made of reinforced concrete) are sequentially joined behind the excavation to construct a cylindrical tunnel wall. The so-called shield method is becoming common.

[0003] In particular, in recent years, it has become necessary to construct a cross section tunnel having an inner diameter much larger than that of the conventional one, such as a tunnel corresponding to a large traffic volume or a tunnel combining a railway and a roadway. . To meet such a demand, it has been proposed to make the cross-sectional shape of the tunnel elliptical.

When the cross-sectional shape of the tunnel is made to be a horizontally long ellipse, the strength against the load in the short axis direction (vertical direction) becomes weak. Is considered. The tie rod is aligned so that both ends thereof are coaxial with the tip of the bolt portion of the mounting bracket provided in advance in the segment, and in this state, the two tie rods approach each other via the coupler serving as the connecting member. By being tightened, it is set at a predetermined position above and below the tunnel.

[0005]

In the connection structure of a tie rod described above, when one worker tries to perform a connection operation on site, the tie rod is supported by one hand while the tie rod is supported. Align the bolt so that it is coaxial with the bolt, and rotate the coupler with one hand remaining in this state.However, the mounting bracket is shifted from the predetermined position due to a manufacturing error or an assembly error. If the tie rods are mounted or shifted in direction, it is very difficult to align the bolts of the mounting brackets coaxially while supporting the tie rods with one hand. In particular, when the cross-sectional area of the tunnel is large, the tie rods also increase in diameter and length, so that the weight tends to increase, and the connecting operation becomes more difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can easily align a tie rod with a mounting bracket so as to be coaxial, so that a segment and a tie rod can be easily connected. It is intended to provide a connection structure.

[0007]

To achieve the above object, according to the first aspect of the present invention, a tie rod mounting bracket for connecting a segment and a tie rod includes a fixing portion fixed to the segment, and a tie rod mounting member. A connecting portion connected to the end portion, and a universal joint connecting the both, and a fixing portion of the tie rod mounting bracket.
Is the outer surface of the through hole from the inner surface to the outer surface of the segment
Tie rod mounting bracket
It is inserted and arranged with a gap between it and the inner peripheral surface of the through hole.
I have. According to the second aspect of the present invention, the fixing portion of the tie rod mounting bracket is liquid-tightly fixed to an outer surface portion of the through hole of the segment via a sealing member.

[0008]

The tie rod mounting bracket is fixed to the segment, and the tie rod is connected to the end of the tie rod.
It is composed of a universal joint that connects the fixing portion and the connecting portion to each other, and the tip of the connecting portion can be moved freely, so that the tip of the connecting portion is coaxial with the tip of the tie rod. Can be easily aligned.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a main part of the present invention, and FIG. 2 is a transverse sectional view of a tunnel. As shown in FIG. 2, the tunnel of this embodiment is formed by joining precast concrete segments 1 to each other in the circumferential direction and the axial direction by joining their joining end faces to each other to form a horizontally long elliptical cross section. It is configured so that

Since the tunnel is formed to have an elliptical cross section, the tunnel has a low strength against a load in the vertical direction, and in order to reinforce the tunnel, the thickness of the segments 1 arranged vertically is set to be large and the upper and lower portions are horizontally oriented. A tie rod 2 made of steel is provided so as to extend to the right side.

The connection structure between the segment 1 and the tie rod 2 will be described by taking a tie rod disposed at the top of the tunnel as an example. As shown in FIG. 1, the segment 1 is provided with a through hole 3 extending from the inner surface to the outer surface. A tie rod fitting 4 for connecting the end of the tie rod 2 to the through hole 3 is inserted and arranged.

The tie rod mounting bracket 4 includes a fixing portion 6 fixed to the segment 1, a connecting portion 7 connected to an end of the tie rod 2, and a universal joint 8 connecting both of them.

The fixing portion 6 is provided in the through hole 3 of the segment 1.
A rectangular recess 9 is formed in the outer surface portion where is formed so that the opening of the through hole 3 is located at the center, and the rectangular fixing portion 6 is fitted into the recess 9. A ring groove 10 is formed on the bottom surface of the concave portion 9 of the segment 1 so as to surround the opening of the through hole, and a seal member 11 is fitted into the ring groove 10. When fixing the fixing portion 6 to the segment 1, the fixing portion 6 may be fixed with a bolt if necessary in a state where the fixing portion 6 is fitted into the concave portion 9 of the segment 1 as described above. In addition, the fixing portion 6 and the concave portion 9 are not necessarily limited to a square shape, and may have another shape, for example.

The connecting portion 7 is rotatable in the vertical or horizontal direction relative to the fixed portion 6 because the base end portion is connected via a universal joint 8. The connecting portion 7 is inserted and arranged with a gap between the connecting portion 7 and the inner peripheral surface of the through hole 3. That is, the diameter of the connecting portion 7 formed in a rod shape is set to a value smaller than the inner diameter of the through hole 3, and can be freely moved within the range of the through hole 3. A tip portion of the connecting portion 7 protruding from the through hole 3 is a bolt portion 7a, into which a nut 12 for locking the connecting portion to the segment 1 is screwed. Is rotatably provided with a coupler 13.

The universal joint 8 includes:
A ball joint having a spherical joint or a ball joint having a ball joint is used. For example, FIGS. 4 and 5 allow vertical rotation (one direction),
The fixed part 6 and the end of the connecting part 7 are connected by a pin 14 extending in the horizontal direction. FIG. 6 shows a case in which rotation in the forward direction is permitted.
Are ball jointed. Further, FIG. 7 allows rotation in two directions (vertical direction and horizontal direction), and the fixing part 6 and the connecting part 7 are
And are connected to each other via pins 14 provided so as to extend in the vertical and horizontal directions, respectively. In addition, the fixing member 6 and the segment 1 are provided with a sealing member 11 on both or one of the bottom surface and the inclined portion.

Although the connection structure between the segment and the tie rod has been described only on one side of the tie rod 2, the connection structure on the other side of the tie rod is the same as that described above. The connection structure at the tip is the same as that described above, and the description thereof is omitted here.

Next, a description will be given of a construction procedure of the connection structure between the segment and the tie rod. First, the tie rod mounting bracket 4 is set on the segment 1. That is, after the sealing member 11 is fitted into the ring groove 10, the connecting portion 7 of the tie rod fitting 4 is inserted from the outer surface into the through hole 3 of the segment 1, and the fixing portion 6 is fitted into the concave portion 9 on the outer surface of the segment 1.

Next, the tie rod 2 to be set
Is lifted, and the ends of the tie rods 2 are moved so that the ends thereof are coaxial with the connecting portions 7 of the tie rod mounting brackets 4 inserted and set in the segment 1 to accurately align them. At this time, the connecting portion 7 is
And the connecting portion 7 is inserted into the through hole 3 with a gap therebetween, so that the connecting portion 7 can be freely rotated within the range of the through hole 7. As a result, the operation of aligning the tip of the connecting portion 7 so as to be coaxial with the end of the tie rod 2 becomes extremely easy.

As described above, the tip of the connecting portion 7 is connected to the tie rod 2.
After aligning so that it is coaxial with the end of
The coupler 13 attached to the tip of the tie rod 2 is screwed into the bolt 7a at the tip of the connecting portion 7 and tightened strongly. Thus, a predetermined tension is applied to the tie rod 2,
The strength in the vertical direction of the tunnel can be improved.

When the coupler 13 is screwed into the bolt portion 7a of the connecting portion 7 and rotated, the connecting portion 7 is
3 may rotate together with the nut.
If the connection 2 is tightened to the side of the segment 1 and the rotation of the connection 7 is regulated by the frictional force, it is possible to prevent the connection 7 from rotating together.

Even when water pressure is applied from the outside of the tunnel, the seal member 11 is interposed between the fixing portion of the tie rod mounting bracket 4 and the segment, and the through hole 3 of the segment 1 is made liquid-tight to the outside. Since the water is held, water outside the tunnel does not enter the inside through the through-hole 3.

In the above embodiment, the case where the segment 1 made of precast concrete is connected to the tie rod 2 has been described as an example. However, the present invention is not limited to this. Of course, it is also possible to apply this case.

[0023]

As described above, according to the present invention, the following excellent effects can be obtained. According to the first aspect of the present invention, a tie rod mounting bracket for connecting the segment and the tie rod is provided with a fixing portion fixed to the segment, a connecting portion connected to the end of the tie rod, and a universal joint for connecting both of them. Since the tip of the connecting part can be freely moved, the tip of the connecting part can be easily aligned so as to be coaxial with the end of the tie rod. Extremely easy.

Further, the fixing portion of the tie rod mounting bracket, attached to an outer surface portion of the through hole extending from an interior surface to an exterior surface of the segment, a gap connecting portion of the tie rod mounting bracket between the inner peripheral surface of the through hole Since it is inserted and placed,
The tie rod mounting bracket can be inserted and arranged in the segment with some degree of freedom, and the tension of the tie rod applied via the tie rod mounting bracket can act on the segment widely, realizing a high-strength tunnel it can.

According to the second aspect of the present invention, since the fixing portion of the tie rod mounting bracket is liquid-tightly fixed to the outer surface of the through hole of the segment via the sealing member, water outside the tunnel is prevented from flowing out of the segment. It can be prevented from entering the inside through the through hole.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part for explaining an embodiment of the present invention.

FIG. 2 is a sectional view of a tunnel to which the present invention is applied.

FIG. 3 is an X-ray arrow view of FIG.

FIG. 4 is a sectional view showing an example of a universal joint.

FIG. 5 is a cross-sectional view illustrating another example of the universal joint, in which another surface is cut.

FIG. 6 is a sectional view showing another example of the universal joint.

FIG. 7 is a sectional view showing still another example of the universal joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 segment 2 Tie rod 3 Through hole 4 Tie rod mounting bracket 6 Fixing part 7 Connecting part 7a Bolt part 8 Universal joint 9 Depression 11 Seal member 12 Nut 13 Coupler 14 Pin

Claims (2)

(57) [Claims] 1. A connection structure between a segment and a tie rod for connecting an end of a tie rod to a segment via a tie rod mounting bracket, wherein the tie rod mounting bracket includes a fixing portion fixed to the segment, and an end of the tie rod. And a universal joint that connects both of them, and the fixing part of the tie rod mounting bracket is
Attached to the outer surface of the through hole from the inner surface to the outer surface,
The connecting portion of the tie rod mounting bracket is in contact with the inner peripheral surface of the through hole.
A connection structure between a segment and a tie rod, which is inserted and arranged with a gap therebetween . Fixing unit according to claim 2, wherein the tie rod mounting brackets, the segments and tie rods according to claim 1, characterized in that it is fixed through a seal member liquid-tightly to the outer surface portion of the through hole of the segment Connection structure.