JPH10266792A - Segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make possible to receive an axial force in both axial and circumferential directions and to obtain sufficient strength by connecting segments that adjoin each other in the circumferential direction of a wall by L-shaped steps and by connecting them also in the axial direction by engagement means. SOLUTION: Segments 1a to 1d are curved with the same curvature as a wall, and concrete is placed in frames. Steps 8 are formed on both sides in the axial direction of the segments 1a to 1d and pins 9 are planted in one of both sides in the axial direction of the segments 1a to 1d at an equal interval. Segments 1b, 1c are installed in a manner of being engaged with each other by steps 8 on circumferential both sides of the segment 1a, and stopped by pins 9. Another segment 1a is connected to the base end side of segments 1a to 1d in the axial direction, and segments 1b to 1d are connected to circumferential both sides. Sufficient strength is obtained by receiving a force acting in the axial direction of the wall in the axial and circumferential directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to segments which are connected to each other to form a wall covering the inner peripheral surface of a drilling hole along the axial direction of the drilling hole.

[0002]

2. Description of the Related Art As a method of constructing a tunnel, a so-called shield method is generally used, in which a plurality of segments are connected radially inward of an excavation hole to construct a cylindrical wall. Further, as a segment used in this shield method, for example, a segment made of concrete or steel is known.

[0003]

By the way, there is a demand for a segment having a simplified structure while securing sufficient strength for the purpose of reducing manufacturing costs and the like. The present invention has been made in view of the above circumstances,
It is intended to provide a segment having sufficient strength and a simplified structure.

[0004]

SUMMARY OF THE INVENTION The present invention forms a wall which is connected along the circumferential direction of a drilled hole and further connected along the axial direction to cover the inner peripheral surface of the drilled hole. A segment, wherein the segment is bent at the same curvature as the circumference of the wall, and is formed of a box-shaped frame whose inner peripheral side is open, and a concrete poured into the frame, The frame body includes a skin plate provided on the outer peripheral side, and a girder portion surrounding the skin plate,
Further, an L-shaped step portion having a surface parallel to the circumferential direction of the wall is formed at a connection portion of the spar portion with the segment adjacent along the circumferential direction of the wall, The segments adjacent to each other along the circumferential direction of the wall are connected to each other through the step portion, and the segments adjacent to each other along the circumferential direction and the axial direction of the wall are connected to the girder. It is characterized in that a locking means for stopping is provided.

Here, it is preferable that the locking means include a projection and an opening formed on the main girder plate along the axial direction of the segment. In this case, the adjacent segments are locked by inserting the protrusion into the opening of the adjacent segment.

The projection has a columnar shape, and at the tip of the projection, concavities and convexities which are coaxial with the projection are formed along the longitudinal direction of the projection. In addition, a washer that engages with the unevenness with the insertion of the protrusion may be supported, and a plurality of cuts may be formed on an inner peripheral side of the washer along a radial direction of the washer.

Further, the projections and depressions may be externally threaded, and a nut may be screwed into the projection inserted into the opening from a distal end side. The joint may be covered with a cap from the tip side.

On the other hand, a screw hole coaxial with the projection is formed from the distal end surface of the projection toward the base end, and the projection inserted into the opening is screwed with the screw hole. It may be covered from the tip side by a cap having a male screw portion.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. 1 to 5
Each of the segments 1a, 1b, 1c, 1 according to the present invention
1 and 3 to 5 show plan views of segments 1a, 1b, 1c and 1d, respectively.
FIG. 2 shows segments 1a and 1 represented by segment 1a.
It is sectional drawing of b, 1c, 1d. These segments 1
a, 1b, 1c and 1d are all as shown in FIG.
A box-shaped steel frame 2 which is bent at the same curvature as the circumference of a wall (to be described later) to be constituted and has an open inner peripheral side, and a concrete 3 cast in the frame 2 It is configured.

The frame 2 includes a skin plate 4 provided on the outer peripheral side, and a girder 5 surrounding the skin plate 4, and the girder 5 is connected by a plurality of ribs 6. Here, since all of these ribs 6 are arranged on the inner peripheral side of the frame 2, a gap S is formed between the ribs 6 and the skin plate 4, and as a result, as shown in FIG. The concrete 3 is cast into a portion of the frame 2 including the gap S. The frame 2 and concrete 3
An adhesive is applied to the inner surface of the frame 2 for the purpose of integration with the frame 2.

The segments 1a, 1b, 1
On both side surfaces (left and right side surfaces in the figure) along the axial direction of c and 1d, surfaces parallel to the circumferential direction of the segments 1a, 1b, 1c and 1d (hereinafter referred to as step end surfaces 7) and segments are provided. 1
L composed of planes parallel to the axial directions of a, 1b, 1c, 1d
The steps 8 each having a letter shape are formed. Step 8
Are the lower right and left parts in the figure for the segment 1a (FIG. 1), the lower left and upper right parts in the figure for the segment 1b (FIG. 3), the upper left and lower right parts in the figure for the segment 1c (FIG. 4), and the segment 1d (FIG. 5). Are formed at the upper left and right in the figure.

Further, these segments 1a, 1b, 1
One of the side surfaces (upper surface in the figure) along the circumferential direction of c, 1d has segments 1a, 1
b, 1c, and 1d, pins (projections,
Locking means) 9 are implanted at equal intervals. The pin 9 has a columnar shape, and at its tip end, as shown by reference numeral 10 in FIG. 6, unevenness coaxial with the pin 9 is formed along the longitudinal direction of the pin 9.

On the other hand, these segments 1a, 1b, 1
Openings (locking means) 11 are provided at the center and both right and left ends of the other side (lower surface in the figure) of both sides along the circumferential direction of c and 1d.
Are formed at equal intervals along the axial direction of the segments 1a, 1b, 1c, 1d. Each of the openings 11 has a diameter larger than that of the pin 9, and a washer 12 is fixed to each of the openings 11 so as to be coaxial from one side. The washer 12 is an annular member as shown in FIG. 7, and has an inner diameter slightly smaller than the diameter of the pin 9 and a plurality of cuts 13 formed radially on its inner peripheral side. ing.

The segments 1a, 1b,
When forming a wall covering the inner peripheral surface of the excavation hole using 1c and 1d, first, the reference numeral A in FIG.
As shown by, the segment 1a is formed with the stepped portion 8 forming side at the tip end side of the excavation hole, that is, the extending direction of the wall (downward in the figure)
Secure toward.

Next, as shown by reference numerals B and C in FIG.
Segments 1b and 1c are respectively provided on both sides in the circumferential direction of the fixed segment 1a, and the step 8 is
a into the opening 11 formed in the step 8 of the segment 1a.
The pins 9 provided on the steps 8 of b and 1c are respectively inserted. Here, a washer 12 smaller in diameter than the pin 9 is fixed in the opening 11, but since the washer 12 has a plurality of cuts 13 formed in the radial direction thereof,
The pin 9 inserted into the opening 11 is inserted into the washer 12 while expanding the inner diameter of the washer 12 by the action of the cut 13.

As a result, as shown in FIG. 6, the unevenness 10 formed at the tip of the pin 9 and the inner periphery of the washer 12 are engaged, and the pin 9 is engaged in a state where it is prevented from falling into the opening 11. The segment 1a is connected to the segments 1b and 1c along the circumferential direction. Further, with the connection, the step portions 8 of the adjacent segment 1a and the segments 1b and 1c come into contact with each other.

Further, the connected segments 1b, 1
c, a new segment 1b,
1c is installed so that the steps 8 are engaged with each other,
The pins 9 implanted in the step portions 8 of the new segments 1b and 1c are inserted into the openings 11 provided in the step portions 8 of the connected segments 1b and 1c, respectively, and locked. New segments 1b and 1c are connected to the segments 1b and 1c, respectively. By repeating the above operation, the plurality of segments 1b, 1
c are connected along the circumferential direction.

On the other hand, the segments 1 connected in the circumferential direction
When closing the rows of a, 1b, and 1c, as shown by reference numeral D in FIG.
d, the step 8 forming side is the base end side of the excavation hole (upward in the figure)
To be fitted. Then, the steps 8 of the segments 1b and 1c engage with the steps 8 of the segment 1d, respectively.
A row of segments 1a, 1b, 1c, 1d along the circumferential direction is completed.

The segments 1a, 1b, 1c, 1d
When extending in the axial direction of the excavation hole, the completed segments 1a, 1b, 1c, 1
A new segment 1a may be connected to the base end of row d, and segments 1b, 1c, and 1d may be connected to both sides in the circumferential direction. Then, by repeating the above operation, a wall covering the inner peripheral surface of the excavation hole is formed along the axial direction of the excavation hole.

Further, these segments 1a, 1b, 1
In the case of a wall formed using c and 1d, the adjacent segments 1a, 1b, 1c and 1d are L-shaped steps 8
Are in contact with each other. Therefore, the force acting on the wall body along the axial direction is applied to the abutment between the segments 1a, 1b, 1c, 1d connected in the axial direction of the wall body, and the step end faces 7 of the step section 8 are connected to each other. It can also be received by abutment, as a result of which sufficient strength is ensured against forces acting in both the axial and circumferential directions of the wall.

The segments 1a, 1b, 1c, 1d
When the pins 9 are connected to each other, the pins 9 are locked in the openings 11 by the engagement of the pins 9 and the washers 12 by the insertion of the pins 9 into the openings 11 due to the contact between the step portions 8. That is,
When a wall is formed by these segments 1a, 1b, 1c, 1d, the pin 9 is simply inserted into the opening 11,
The segments 1a, 1b, 1c, 1d can be reliably connected to each other. Moreover, the segments 1a, 1b,
The segments 1c and 1d are manufactured by simply placing the concrete 3 in the frame 2 having a simplified structure.
The manufacturing costs of a, 1b, 1c, and 1d can be reduced.

As shown by the reference numeral 21 in FIG. 6, the engaging portion between the pin 9 and the washer 12 is covered with, for example, a resin cap from the tip end of the pin 9 to protect this connecting portion. Is also good. In this case, as shown by a reference numeral 21a in FIG. 9, the opening side of the cap 21 is enlarged, and the washer 12 in which the pin 9 is inserted is made detachable from the opening 11, so that the cap 9 is connected to the pin 9. The rear washer 12 may be movable by the gap between the opening 11 and the pin 9 and by the diameter of the cap 21. By making the washer 12 movable with the pin 9, there is a margin in the construction, and as a result, the position of the segment 1 is slightly shifted.
a, 1b, 1c, and 1d can also be connected.

The segments 1a, 1b, 1c, 1d
As an interlocking means, other than the above-mentioned one using only the pin 9 and the washer 12, for example, the following application examples shown in FIGS. 10 to 13 can be applied.

FIG. 10 shows a case where the unevenness 10 formed on the pin 9 is a male screw, and the nut 22 is screwed into the pin 9 inserted into the opening 11 from the tip end via the unevenness 10. It is an example. In this case, the action of the nut 22 is added to the action of preventing the pin 9 from coming off due to the locking of the unevenness 10 and the washer 12, so that the pin 9 is more securely locked in the opening 11.

As shown in FIGS. 11 and 12, a screw hole 23 coaxial with the pin 9 is formed from the distal end of the pin 9 to the proximal end thereof. 9
Is covered with a cap 25 having a male screw portion 24 screwed into the screw hole 23 from the front end side, so that the pin 9
May be locked. Further, as shown in FIG.
It is also possible to lock the screw 26 in the opening 11 by screwing the nut 22 from the tip side to the screw 26 inserted in the opening 11 instead of using the screw 26. .

[0026]

As described above, in the case of the present invention, the force acting on the wall body along the axial direction is applied to the abutment between the segments connected in the axial direction of the wall body to form the step on the wall. It can also be received by the contact between the surfaces parallel to the circumferential direction of the wall body, so that sufficient strength is secured against the force acting on both the axis and the circumferential direction of the wall body. In addition, since the segments are manufactured only by placing concrete in the frame having a simplified structure, the cost for manufacturing the segments can be reduced. Also, the connection between the segments is easy.

[Brief description of the drawings]

FIG. 1 is a front view along an arrow I showing an example of a segment structure according to the present invention.

FIG. 2 shows an example of a segment structure according to the present invention.
FIG. 2 is a sectional view taken along the line I-II.

FIG. 3 is a front view showing an example of the structure of a segment according to the present invention.

FIG. 4 is a front view showing an example of the structure of a segment according to the present invention.

FIG. 5 is a front view showing an example of the structure of a segment according to the present invention.

FIG. 6 is an enlarged cross-sectional view showing an example of a state of connection between segments according to the present invention.

FIG. 7 is a front view showing a structure of a washer used for the segment according to the present invention.

FIG. 8 is a view showing a part of a wall formed by using a segment according to the present invention.

FIG. 9 is an enlarged cross-sectional view illustrating an example of a connection state between segments according to the present invention.

FIG. 10 is an enlarged cross-sectional view showing an example of a state of connection between segments according to the present invention.

FIG. 11 is an enlarged cross-sectional view showing an example of a state of connection between segments according to the present invention.

FIG. 12 is an enlarged cross-sectional view showing an example of a state of connection between segments according to the present invention.

FIG. 13 is an enlarged cross-sectional view illustrating an example of a connection state between segments according to the present invention.

[Explanation of symbols]

 1a, 1b, 1c, 1d Segment 2 Frame 3 Concrete 4 Skin plate 5 Girder 7 Step end face 8 Step 9 Pin (projection, locking means) 10 Unevenness 11 Opening (locking means) 12 Washer 13 Cut 21 Cap 22 Nut 23 Screw hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masanori Wakabayashi 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Ishikawashima Building Materials Industry Co., Ltd. (72) Inventor Yoshinori Nishida 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo No. Taisei Construction Co., Ltd. (72) Inventor Osamu Kaji 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. Within Construction Co., Ltd.

Claims (6)

[Claims] 1. A segment that is connected along the circumferential direction of a drilling hole and is further connected along the axial direction to form a wall body that covers an inner peripheral surface of the drilling hole. The frame is bent at the same curvature as the circumference of the wall, and is formed of a box-shaped frame whose inner peripheral side is open, and concrete cast in the frame. A skin plate provided, and a girder portion surrounding the periphery of the skin plate; and a connecting portion of the girder portion with the segment adjacent along the circumferential direction of the wall body, in a circumferential direction of the wall body. An L-shaped step having a plane parallel to the wall is formed, and the segments adjacent to each other along the circumferential direction of the wall are connected via the step, and the spar is The seg adjacent to the wall along the circumferential direction and the axial direction A segment provided with locking means for locking the elements. 2. The locking means includes a projection and an opening formed in the beam portion along the axial direction of the segment, and the projection is inserted into the opening of the adjacent segment. The segments according to claim 1, wherein adjacent segments are locked with each other. 3. The projection has a columnar shape, and at the tip of the projection, concavities and convexities coaxial with the projection are formed along the longitudinal direction of the projection, and the opening is formed. To
A washer that engages with the projections and depressions with the insertion of the protrusion is supported, and a plurality of cuts are formed on an inner peripheral side of the washer along a radial direction of the washer. Item 2. The segment according to Item 2. 4. The segment according to claim 3, wherein the projections and depressions are male threads, and a nut is screwed into the projection inserted into the opening from a tip end side. 5. An engagement portion between the projection and the washer,
The segment according to claim 3, wherein the segment is covered with a cap from a tip end side. 6. A screw hole coaxial with the projection is formed from the distal end surface of the projection toward the base end, and the projection inserted into the opening is screwed with the screw hole. 3. The segment according to claim 2, wherein the segment is covered from the tip side by a cap having a male screw portion.