JP2589790B2 - Segment joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a joint structure of segments for performing primary lining in a shield method.

[Prior Art] Conventionally, as shown in FIG. 4, a segment 1 is formed on a segment S1 in the thickness direction from the inside in the judgment direction in a state where the segment S2 is connected in a ring shape, as shown in FIG. 1 penetrates radially inward and outward through holes 2 and 3 from the joining surface F of the segments S1 and S2,
After joining, the so-called through bolts 4 and 5 are inserted into the through holes 2 and 3 respectively, and nuts 6 and 6 are screwed into both ends of the through bolts 4 and 5 and tightened, so that both segments are tightened.
S1 and S2 are connected. Reference numerals 7 and 7 in the drawings are through bolts connecting the segments in the axial direction.

In the above conventional structure, a positive bending acts on the through bolt 4 and a negative bending acts on the through bolt 5.

By the way, the depth of the concave portion 1 is limited by the restriction on the strength of the segment S, and the distance D cannot be so large. Therefore, the negative bending strength of the through bolt 5 was inferior, and the strength of the joint was low.

Therefore, an object of the present invention is to provide a joint structure of a segment that increases the negative strength of a through bolt (core bolt) without impairing the strength of the segment itself, thereby improving the strength of the joint. .

[Means for Solving the Problems] According to the present invention, in a state where the segments are connected in a ring shape, a concave portion is formed in the segment in the thickness direction from the inside in the radial direction, and the first surface is formed from the concave portion to the joining surface of the segment. A small recess is formed in a part of the recess so as to penetrate through the bolt insertion hole of the recess and to hold the nut in the thickness direction from the bottom of the recess on the joining surface side. And a bolt receiving hole is formed from the small recess so as to face the second bolt insertion hole, and the first bolt is inserted into the first bolt insertion hole of the adjacent segment. A nut is screwed into both ends protruding from the bolt insertion hole, and the second bolt previously stored in the second bolt insertion hole and the bolt storage hole is inserted into the second segment of the adjacent segment.
Nuts are screwed into both end portions protruding from the bolt insertion holes through the bolt insertion holes.

[Operation] In the joint structure of the segments configured as described above, the second bolts, so-called core bolts, are previously stored in the second insertion holes and the bolt storage holes. After the segments are joined, first bolts, so-called through bolts, are inserted into the first bolt insertion holes of both segments, and nuts are screwed into both ends of the bolts and tightened. Next, the core bolt is moved to be inserted into the second insertion hole of the counterpart segment, and nuts are screwed into the end on that side and the end on the side of the small recess, respectively, and these nuts are tightened. Cooperate with to link both segments. The insertion and connection of the two bolts may be performed in the reverse order.

In such a connected state, the distance of the core bolt axis from the inner surface of the segment is larger than before,
Therefore, the negative bending strength is large.

In addition, the small recess is small enough to hold the nut and is partially formed in a part of the recess, so that the influence on the strength of the segment is negligibly small.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 3, a concave portion 10 is formed in the segment S in the thickness direction from the inside in the radial direction. The recess 10 has a depth H1 equal to, for example, about 58% of the thickness of the segment S.
%, The width direction of the opening is, for example, about 60 times the width of the segment S.
%, The circumferential direction is formed to have a length that allows a later-described through bolt to be inserted into a first bolt insertion hole 12 described later, and the opposing peripheral walls 10a, 10b and 10c, 10d are adjacent to each other radially outward. It is inclined to.

A first bolt insertion hole 12 penetrating through the joint surface F is formed in the peripheral wall 10a of the concave portion 10 on the joint surface F side at a position of a depth h1 of, for example, about 18% of the thickness of the segment S. .

On the joint surface F side of the bottom surface 10e of the concave portion 10, an intermediate position of a plurality of (three in the illustrated example) first insertion holes 12 is provided.
Two small recesses 11 are formed, one each.
The small recess 11 has a depth H2 of, for example, about 28% of the thickness of the segment S, and an opening having a size such that a nut can be screwed into a core bolt described later and tightened. The small recess 11 is partially formed in a part of the recess 10.

On the joint surface F side of the small concave portion 11, a second bolt insertion hole 13 penetrating the joint surface F is provided at a position where the depth h2 from the inner surface of the segment S is, for example, about 72% of the thickness of the segment S. A bolt storage hole 14 is formed on the side facing the insertion hole 13. The distance L between the end of the insertion hole 13 and the opposite end of the storage hole 14 is set to a length that can accommodate a so-called core bolt. Reference numeral 15 in the drawing denotes a third bolt insertion hole through which a through bolt for connecting the segments in the axial direction is inserted, and reference numeral 16 denotes a concave portion for connecting the segments in the axial direction.

When connecting the segments, the core bolts are stored in advance in the second bolt insertion holes 13 and the bolt storage holes 14. After joining the segments, the first bolt insertion hole 12
And screw the nuts into both ends of the bolts and tighten them. Next, the core bolt is moved to the joint surface F side and inserted into the second bolt insertion hole of the adjacent segment,
Screw the nut to both ends of the bolt and tighten. The segments are connected to each other in cooperation with the through bolt.

[Effects of the Invention] Since the present invention is configured as described above,
By increasing the distance of the radially outer core bolt from the inner surface of the segment (for example, twice as large as the conventional one), it is possible to increase the negative bending strength and improve the strength of the joint. that time,
The small recess for screwing the nut to the core bolt is small enough to hold the nut, and is partially formed in a part of the recess, and has substantially no effect on the strength of the segment. It can be ignored above.

[Brief description of the drawings]

1 is a plan view of one embodiment of the present invention as viewed from the inside in the radial direction, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is BB of FIG. FIG. 4 is a sectional view corresponding to FIG. 3 showing a conventional structure. F: joining surface, S: segment, 10: recess, 11 ...
Small recess, 12 first bolt insertion hole, 13 second bolt insertion hole, 14 bolt storage hole

Claims (1)

(57) [Claims] In a state in which the segments are connected in a ring shape, a concave portion is formed in the segment in the thickness direction from the inside in the radial direction, and a first bolt insertion hole penetrates from the concave portion to the joint surface of the segment. A small recess is formed in a part of the recess so as to be able to hold the nut in the thickness direction from the joint surface side bottom of the recess, and a second bolt insertion hole is penetrated from the small recess to the joining surface, A bolt housing hole is formed from the small recess to face the second bolt insertion hole, and the first bolt is inserted into the first bolt insertion hole of the adjacent segment, and both ends protrude from the bolt insertion hole. And a second bolt previously stored in the second bolt insertion hole and the bolt storage hole is inserted into the second bolt insertion hole of the adjacent segment and protrudes from the bolt insertion hole. Screw nuts on both ends Joint structure of the segment, characterized in that.