JP3256031B2 - Assembling method of arc-shaped concrete segment without joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a cylindrical wall by joining and assembling a large number of arc-shaped concrete segments to each other, and more particularly to a method in which the concrete segments are joined to circumferential joint end faces. The present invention relates to a method of assembling a concrete segment of a type that does not include a joint means such as a joint fitting but merely joins.

[0002]

2. Description of the Related Art Concrete segments of this type are used, for example, in boltless segments when the ground has sufficient strength. Therefore, when joining the segments together, the joining ends of the segments in the circumferential direction are merely joined without providing any joint means such as joint fittings, and expansion and contraction in the circumferential direction occurs without being restricted by the joint means. I have to. As for the joining of the segments in the axial direction, a pin provided on one end face and a mortise provided on the other are fitted to each other to form a semi-fixed pin connection state.

In order to construct a cylindrical wall by assembling the above segments, a plurality of segments are joined in the circumferential direction to form a segment ring, and segments are joined one after another to the axial end face of the segment ring. Conventionally, a method of repeating the step of joining the segment rings has been performed.

[0004]

However, as described above, the joining of the segments in the circumferential direction is only to match the end faces, and the joining in the axial direction is not strong such as fitting of a pin and a tenon. Construction of the tubular wall itself was extremely difficult. When one segment ring is configured, as shown in FIG.
When the last segments 1 are joined one by one, since the peripheral length on the outer peripheral surface side is longer than that on the inner peripheral surface side, the final segment 1 must be fitted from the inside of the segment ring 1A. Is impossible and therefore must be done from the outside. In order to fit the segment 1 from the outside in this way, since the pins are obstructed if they protrude, the segment on the existing side where the segment 1 is finally fitted is
Conventionally, no pins are provided. However, since the last place where the segment 1 is fitted is necessarily the uppermost top, the joining of the segments extending in the axial direction of the cylindrical wall as a whole is merely a joining, and the inner wall is resistant to internal pressure. This may lead to a failure to balance the twisting force.

The present invention has been made in view of the above circumstances, and it is possible to realize joining of segments without joints without difficulty, and at the same time, the missing portions of the axially connected portions are dispersed to resist internal pressure. It is an object of the present invention to provide a method for assembling an arc-shaped concrete segment having no joint, which can achieve a good balance of force.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and an arc plate having no joint means in a joint end face at both ends in a circumferential direction is formed in a drilled hole provided in the ground. A plurality of concrete segments are joined in the circumferential direction to form a segment ring, and a plurality of the segments are connected to the segment ring except for a part of the axial end faces.
By repeating the step of joining the next segment ring by coupling, a method of assembling without the joint arc plate-like segments to build a tubular wall, the inner peripheral surface side of the segments, connected to each other Possible and both sides seg
Removably attached to the instrument assembly frames and the axial end surface flush of mintues frame each other to each other
After assembling the segments through this frame by joining together , filling the backfill between each segment and the inner surface of the ground, and thereafter, removing each frame from the segment I have.

[0007]

According to the present invention, since the segments are joined to each other via the frame detachably attached to the segments, the segments are joined to the existing segments while supporting the newly assembled segments. The construction of the wall is much easier than in the past. And, by such assembling, since the position of the segment to be finally fitted from the outside can be set at an arbitrary position, when the pins are joined in the axial direction, the joining parts where the pin joining is not performed should not be in a series state. As a result, the balance of the force against the internal pressure can be improved.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a cylindrical wall 10 for turbine power generation.
FIG. 2 shows a part of a state in which the ground wall G is constructed as viewed from the inner side. As shown in FIG.
Concrete segment 1 on the inner wall of the excavation hole H
1 is assembled.

As shown in FIGS. 3 (a) and 3 (b), the segment 11 has a basic shape formed from a concrete into an arc plate having a substantially square shape in a front view. As shown in FIG. 2, the circumferential length of the segment 11 is set to a length such that one segment ring 10A is formed when eight segments are joined along the circumferential direction. A step 12 is formed at both ends in the circumferential direction of the segment 11 along the axial direction (width direction), and the step 12 forms a bulging portion 13 on the inner peripheral surface side of the segment 11 to bulge. Further, end-face metal fittings 14 having an L-shaped cross section are buried in the corner portions on the outer peripheral surface side and the inner peripheral surface side at both ends in the circumferential direction to reinforce this portion. Further, in the center of the segment 11, a plurality (four in this case) of filling holes 15 for the backfill material are formed. The joint end surfaces 11a at both ends in the circumferential direction of the segment 11 and the joint end surfaces 11b at both ends in the axial direction are flat, respectively.
A seal groove 16 into which the sealing material is fitted is formed. A plurality (two in this case) of mortises 18 into which the pins 17 are removably inserted are formed in the joint end face 11b.

A plurality (three in this case) of insert fittings 19 are provided on the inner peripheral surfaces of both ends in the axial direction of the segment 11.
Are embedded on a line along the circumferential direction of the segment.
The insert fitting 19 is a cylindrical member having a threaded hole, and is embedded in the segment 11 with its axial direction coinciding with the radial direction of the segment 11. The frame 20 according to the present invention is removably attached using the insert fitting 11.

The frame 20 is made of steel. As shown in FIGS. 4 (a) and 4 (b), end plates 22 are welded to both ends of the main girder 21 corresponding to the inner circumferential length of the segment 11. Configuration. The main girder 21 is made of a steel material having an L-shaped cross section, and has a main plate portion 23 fitted to the inner peripheral surface of the segment 11 and a pair of left and right sub-plate portions fitted flush with the joint end surface 11b of the segment 11 on the axial side. 24. Bolt insertion holes 23a corresponding to the insert fittings 19 are formed in the main plate portion 23, and bolt insertion holes 24a for connecting the frames 20 are formed in the sub-plate portion 24, respectively. Also, bolt insertion holes 22a for connecting the frames are formed. In FIG. 1, one of the pair of sub-plate portions 24 is omitted to clarify the connection state.

In the frame 20, the sub-plate portion 24 is flush with the joint end surface 11b, and the main plate portion 23 is aligned with the inner peripheral surface of the segment 11, and in this state, the bolt is inserted through the bolt insertion hole 23a on the main plate portion 23 side. By attaching bolts (not shown) to the insert fitting 19, the segments 11 are attached to both ends in the axial direction on the inner peripheral surface side of the segment 11. Further, if the bolt is removed, it can be removed from the segment 11.

Next, a procedure for constructing the cylindrical wall body 10 from the segments 11 will be described. First, the frame 20
Is attached to the plurality of segments 11 to be used as described above, and the joining end face 11 on the side facing the construction direction is used.
The pin 17 is inserted into the mortise 18 of b. Then
These segments 11 are assembled in a ring shape from the bottom surface of the excavation hole H provided in the ground G by bolting the end plates 22 of the frame 20 to be fitted together by using the bolt insertion holes 22a, and the starting side segment ring 10
Construct A. In FIG. 1, the symbols 10A, 10B, 10C,... By joining the end plates 22, the segment 1
The first bonding end surfaces 11a are brought into close contact with each other. In this case, the segment ring 10A is configured by assembling eight segments 11;
1 is fitted from the outside of the segment ring 10A. It should be noted that the pin 17 is not inserted into one of the eight segments 11 constituting the segment ring 11 (the uppermost portion is preferable).

Thus, one segment ring 10A
Then, mortise holes 18 are fitted into the pins 17 and the sub-plate portions 24 of the frame 20 are fitted to the respective segments 11 of the segment ring 11A, and the frames 20 are connected to each other with bolts passed through the matching bolt insertion holes 24a. To join the segments 11 together. By joining the sub-plate portions 24, the segments 11
Are brought into close contact with each other. Then, the joining of the segments 11 to the segment ring 10A and the joining of the segments 11 in the circumferential direction to the end plate 22 are performed.
We will go by bolt connection.

In this manner, the plurality of segments 11 are joined to the axial end surface of the segment ring 11A, and the next segment ring 10B is connected to the segment ring 10A.
It is configured in a state where it is joined to. In addition, segment ring 1
In assembling 0B, the segment 11 to be fitted last from the outside is joined to the segment 11 in which the pin 17 of the segment ring 10A is not inserted. In other words, unless the pin 17 is joined to the segment 11 into which the pin 17 has not been inserted, the last segment 11 cannot be fitted from the outside.

As described above, the segments 11 are joined to the existing segment rings (10A, 10B...) Whose axial end faces are exposed via the sub-plate portion 24 of the frame 20 and via the end plates 22. By joining the segments 11 in the circumferential direction, the segment rings 10C, 10C
D, 10E... Are assembled to construct the cylindrical wall body 10. In addition, the segment 11 in which the pin 17 is not inserted in order to fit the segment 11 at the end is each ring 10A,
Each of the segments 10B, 10C,... Is shifted in the circumferential direction by one segment 11 so that the joints where the pins 17 are not joined by the pins 17 in the axial joining are prevented from being in series.

When the cylindrical wall 10 is constructed in a certain section (for example, a section having five segment rings) in this manner, a plurality of segments 11 are selected and the segment 1 is selected.
A filling material such as mortar is injected and filled into the gap between the ground G and the cylindrical wall body 10 from the filling hole 15 of the first material, and the backing material is hardened and the stability of the cylindrical wall body 10 is confirmed. Then, all the attached frames 20 are detached from the segment 11, and the detached frame 20 is attached to the segment 11 to be newly assembled.
1 is repeated to construct a cylindrical wall 10 of a required length.

According to the method of constructing a cylindrical wall from a large number of segments 11 as in the above embodiment, the segments 11 are joined to each other via the frame 20 detachably attached to the segments 11. That is, since the segments are joined in the same manner as when joining ordinary segments having joint means, the existing segment 1
This is carried out while supporting the segment 11 to be newly assembled with respect to one, so that the construction of the cylindrical wall body 10 becomes much easier as compared with the related art.

Then, by joining the segments 11 by connecting the frames 20, it is possible to set the position of the segment 11 to be finally fitted from the outside to an arbitrary position except for the bottom surface side. FIG. 5 shows a portion that is not pin-connected to three segments 1 constituting the top of the cylindrical wall 10.
1 shows a state in which the pins 17 are dispersed and distributed.
The cylindrical wall 1 is prevented from being in a series state.
The balance of the force against the internal pressure at 0 is good.

[0020]

As described above, according to the method of assembling the arc-shaped concrete segment without joints of the present invention, joint means are provided at the joint end faces at both ends in the circumferential direction in the excavation holes formed in the ground. A plurality of arc-shaped concrete segments not to be joined in the circumferential direction to form a segment ring,
By repeating the process of joining the next segment ring by joining a plurality of segments to this segment ring and excluding a part of the end faces in the axial direction and joining the next segment ring, a jointless arc plate segment for constructing a cylindrical wall body The assembly method of the above, on the inner peripheral surface side of the segment, can be mutually connected and both sides are flush with the axial end surface of the segment
Mountable, the full removal of the assembly frames
After assembling the segments through this frame by abutting and joining the frames to each other, a backfill material is filled between each segment and the inner surface of the ground. It is characterized by being detached from the segment, and since the segments are joined via a frame detachably attached to the segment, it will be performed while supporting the newly assembled segment to the existing segment, In addition, the construction of the cylindrical wall is much easier than before. And, by such an assembling, the position of the segment to be finally fitted from the outside can be set to an arbitrary position. Therefore, when the pins are joined in the axial direction, the joining parts where the pin joining is not performed should not be in a series state. As a result, the balance of the force against the internal pressure can be improved. Also, except for a part of the axial end face of the segment,
The segments are joined so that the end faces of the segments in the axial direction
Very easy and highly accurate due to pin connection
Can be assembled in the positioned state,
Business performance can be greatly improved. In addition,
The sides of the frame are flush with the axial end faces of the segments.
And join the frames against each other
The segments together through the frame
So that the end faces of the segments in the axial direction
This allows the assembled frames to push each other
So that the bolts between the frames
Bonds are extremely easy and, depending on the bolt frame
By combining the arms, the accuracy is further improved
In addition, segments can be assembled.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a cylindrical wall is constructed according to an embodiment of the present invention.

FIG. 2 is a front view of a cylindrical wall.

3A is a front view of a segment, and FIG. 3B is a side view of the segment.

4A is a front view of a frame attached to a segment, and FIG. 4B is a side view of the frame.

FIG. 5 is a plan view of a cylindrical wall body showing the presence or absence of an axial pin connection portion.

FIG. 6 is a front view showing an example of a conventional segment assembling method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cylindrical wall 10A-10F Segment ring 11 Segment 11a, 11b Joining end face 17 Pin 18 Mortise 20 Frame G Ground H Excavation hole

Claims (1)

(57) [Claims] 1. A segment ring is formed by joining a plurality of arc-shaped concrete segments having no joint means at the joining end faces at both ends in the circumferential direction into a borehole formed in the ground in the circumferential direction. No joint for constructing a cylindrical wall by repeating the step of joining the next segment ring by joining a plurality of the segments to the ring and excluding a part of the end faces in the axial direction with a pin. a method of assembling an arc plate shape segments, the inner circumferential surface side of the segments, and both can be connected to each other
Sides removably attached to the assembly frames and the axial end face flush segments, the frame with each other
After assembling the segments through this frame by butting and joining each other , filling the backfill between each segment and the inner surface of the ground,
A method of assembling an arc-shaped concrete segment without a joint, wherein each frame is detached from the segment.