JP4184984B2 - Concrete member, its joining structure and positioning member - Google Patents

Description

The present invention relates to a concrete member , a joint structure thereof, and a positioning member that are used to connect each other to construct a cylindrical structure .

  For example, a shield tunnel lining body used as a tunnel for a subway, etc. is connected in the axial direction to a ring-shaped segment assembly in which arc-shaped concrete segments are assembled into a cylindrical shape behind a shield excavator. And configure. In order to improve the assembly accuracy of the segments and speed up the assembly work, a positioning means may be provided between the joint surfaces of the segments. As such positioning means, there is a method in which a convex portion is formed on one of the joining surfaces of the segments and a concave portion is formed on the other.

  However, when unevenness is formed in advance on the segment itself, a recess is formed on the mold surface when the segment is manufactured, which increases the processing cost. Further, when there is a problem with the positioning means or when it is found that the positioning means itself becomes an obstacle in construction, it is difficult to cope with it, and construction is delayed. Furthermore, there is also a risk that the projection side portion may come into contact with other members or the like during transportation or movement to a construction site and be damaged. Therefore, as shown in Patent Document 1, grooves having a semicircular cross section are formed on both joint surfaces of the segment, and a metal ball or rod-like positioning member fitted in these grooves is used as an adhesive. There has been proposed a method of mounting using the.

JP 2002-54398 A

  As described above, the positioning member is attached immediately before joining the segments in order to avoid the projection side portion from coming into contact with another portion and to confirm that the position is matched. It is desirable. However, since the conventional technology as described above is attached using an adhesive, in order to secure the positioning function of the positioning member, it is necessary to wait for the construction to cure until the adhesive is cured. Will fall. Further, when it is found that the construction is hindered after the bonding, there is a problem that the construction is delayed in order to remove this.

The present invention has been made in view of the above circumstances, and it is easy to mount a positioning member, and a highly flexible concrete member that can be removed as needed after mounting , its joining structure, and positioning member. The purpose is to provide.

The concrete member according to claim 1 is a concrete member joined by abutting the side surfaces with a positioning member interposed between the side surfaces,
A mounting portion and a recess on the side surface;
The mounting portion engages detachably with engaging portion at one end of the positioning member, the recess have a shape that fits to the convex portion formed at the other end of the positioning member,
The attachment portion is elastically fitted to the engagement portion to form a retaining structure.
It is characterized by that.

The joint structure of a concrete member according to claim 2 is a joint structure of a concrete member configured by abutting the side surfaces with a positioning member interposed between the side surfaces of a pair of concrete members,
The positioning member has an engaging portion on one end side and a convex portion on the other end side,
One of the side surfaces is provided with an attachment portion that is detachably engaged with the engagement portion,
On the other of the side surfaces, a recess is formed that fits into the protrusion of the positioning member ,
The engagement portion is elastically fitted to the attachment portion to form a retaining structure,
It is characterized by that.

The positioning member according to claim 3 is interposed between the side surfaces of the concrete member having a mounting portion on a part of the side surface and a recess on the other part, and positioning when the side surfaces are abutted with each other. A positioning member to perform,
Thereby releasably engage the mounting portion through the engagement portions on one end side, a convex portion formed on the other end side is adapted to fit into the recess,
The engagement portion is elastically fitted to the attachment portion to form a retaining structure.
It is characterized by that.

  The positioning member can be made from various materials such as resin, ceramics, metal, or a composite material thereof. Thereby, the positioning effect | action by the positioning member provided with the characteristic of each raw material is exhibited. In addition, by preparing positioning members having different materials, shapes, and dimensions, positioning members having characteristics according to the situation can be appropriately selected and used.

  According to the first to third aspects of the invention, the positioning member can be quickly and easily and surely attached to the concrete member immediately before the concrete member is joined. Therefore, work efficiency will not be reduced due to the mounting of the positioning member, and it will be possible to avoid situations where positioning protrusions collide with other members or cause trouble in construction during transport and position adjustment. Can do. Since the positioning member is securely fixed, the positioning function can be fully exerted, and the positioning member can be easily removed even if it is found that the installation will be hindered after being attached once. Yes, the construction can proceed smoothly.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a shield tunnel lining body constructed using a concrete segment, which is a concrete member according to an embodiment of the present invention, as seen from the entrance side. This shield tunnel lining body has a configuration in which a large number of assemblies 2 in which arc-shaped plate-like concrete segments 1a, 1b, 1c, 1d, and 1e that are divided into five in the circumferential direction are annularly assembled are arranged in the axial direction. ing. Reference numeral 3 denotes a joint for connecting the assembly 2 in the axial direction.

  Of these concrete segments 1a, 1b, 1c, 1d and 1e (hereinafter abbreviated as 1 when it is not necessary to distinguish), the four concrete segments 1a, 1b, 1c and 1d have a central angle of about 84 °. One concrete segment 1e is a small concrete segment having a central angle of 24 °, and these are sequentially connected in the radial direction. The small concrete segment 1e is a final assembled concrete segment. After the other large concrete segments 1a, 1b, 1c, and 1d are built, the small concrete segment 1e is attached by moving in the axial direction from the face side. Closed. The small concrete segment 1e has a narrower width on the side of the face than the face side, and has a wedge action to push the gap between the concrete segments 1a and 1d when attached.

As shown in FIG. 2, each concrete segment 1 has joint surfaces (side surfaces) 10a, 10b, and 10c for connecting them into a tubular body. These joint surfaces 10a, 10b, and 10c are substantially flat surfaces having shallow grooves formed on the outer peripheral side. At both ends in the radial direction, axial grooves having a trapezoidal cross section are provided as shown in FIG. A first recess 12 and a second recess 14 are formed. The first recess 12 and the second recess 14 are formed at positions facing each other on the joint surfaces 10a, 10b, and 10c when the segments 1 are connected. The first recess 12 is formed shorter than the second recess 14, while the second recess 14 is open at the end face in the axial direction.

  As shown in FIG. 4, a positioning member 16 is attached between the joint surfaces 10 a, 10 b, and 10 c of the segment 1 in a space formed by the first recess 12 and the second recess 14. . In this embodiment, the positioning member 16 is made of resin (ABS resin), but can be made of an appropriate material such as ceramic or metal. As shown in FIG. 5, the positioning member 16 is fitted to the second recess 14 and the truncated pyramid-shaped embedded portion (second projection) 18 that is fitted and attached to the first recess 12. The pyramidal frustum-shaped exposed portion (first convex portion) 20 has a hexagonal cross section that is coupled on the bottom surface of each frustum. In this embodiment, the width of the bottom surface of the exposed portion 20 is larger than the bottom surface of the embedded portion 18, so that the overhang portion 22 is formed on the outer side in the width direction as shown in FIG. ing.

  In the first recess 12 and the embedded portion (second convex portion) 18, the slopes 12 a and 12 b (see FIG. 3) and the slopes 18 a and 18 b (see FIG. 5) have the same inclination angle, and similarly In the second recess 14 and the exposed portion (first convex portion) 20, the slope 14a and the slope 20a have the same inclination angle. Therefore, the first recess 12 and the embedded portion (second convex portion) 18 are in surface contact with each other on the slopes 12a, 12b, 18a, 18b, and similarly, the second concave portion 14 and the exposed portion (first convex portion). Part) 20 is in surface contact with the slopes 14a, 20a. The exposed portion 20 is also formed with slopes 20b, 20b for chamfering on the end face in the longitudinal direction, which facilitates insertion into the second recess 14 and also during construction. Avoid collisions with other parts. Whether or not to form the inclined surfaces 20b, 20b, or the inclination angle thereof can be appropriately set.

  A structure for detachably attaching the positioning member 16 to the segment 1 is provided between the first recess 12 and the positioning member 16. That is, the embedded portion 18 is provided with a cylindrical engaging portion 24 that protrudes from the top surface side of the truncated pyramid, and the bottom of the first recess 12 is a jig for receiving the engaging portion 24. A tool 26 is embedded. In this embodiment, the engaging portion 24 is formed integrally with the positioning member 16, but may be formed by embedding another cylindrical member in the main body. The engaging portion 24 is formed in a slit shape that is divided in the circumferential direction, the tip surfaces of the projecting pieces 24a, 24a are formed smoothly, and the projecting ridge extending in the circumferential direction on the outer peripheral surface on the tip side. 25 is formed.

The jig 26 is made of ABS resin in this embodiment, but can be made of an appropriate material such as metal or ceramics. Jig 26 has a large diameter portion 27 of the outer end, a small-diameter portion 28 extending from the large diameter portion 27 on the inner portion of the segment 1, a large径板shaped anchor portion 29 of the end portion. The large diameter portion 27 has an inner diameter set to be approximately the same as the outer diameter of the engaging portion 24, and a circumferential groove 30 corresponding to the protrusion 25 of the engaging portion 24 is formed on the inner surface. An internal thread 31 is formed on the inner surface of the small-diameter portion 28 and is used to fix the jig 26 to the concrete pouring mold when the segment 1 is manufactured. That is, a male screw on the other end side of a rod-like member (not shown) whose one end is fixed to the mold is screwed into the female screw 31. The rod-shaped member is removed from the large-diameter portion 27 embedded in the segment 1 by unscrewing after the segment 1 is solidified. In order to prevent the accompanying rotation at this time, a flat surface 32 is formed on the outer shape of the small diameter portion 28.

  A procedure for joining the concrete segments 1 configured as described above will be described with reference to FIGS. 1 and 2. When assembling the shield tunnel lining body, for example, the large concrete segment 1c is first installed, and then the large concrete segment 1b adjacent thereto is hung with a winch or the like, and the joint surfaces 10a, 10b, 10c are aligned while being aligned. Close. Then, after confirming that the positions of the recesses 12 and 14 of the joint surfaces 10a, 10b and 10c of the concrete segments 1c and 1b are matched and the positioning member 16 does not hinder the construction, the positioning member 16 is moved to each segment. It attaches to the 1st recess 12 of the side surface which 1c and 1b oppose.

  In order to attach the positioning member 16 to the first recess 12, the embedded portion 18 side is pushed toward the first recess 12 in a state where the longitudinal directions thereof are aligned. As a result, mutual centering is performed by sliding between the embedded portion 18 and the slopes 18 a, 18 b, 12 a, 12 b of the first recess 12, and the distal end of the engaging portion 24 is the large-diameter portion 27 of the jig 26. To face. When the positioning member 16 is further pushed in, the engaging portion 24 is pushed inward by the edge of the large diameter portion 27 to reduce the diameter, and enters the large diameter portion 27. When the engaging portion 24 further enters and the positions of the protrusion 25 and the circumferential groove 30 coincide with each other, they are fitted to expand the engaging portion 24 to prevent the positioning member 16 from coming off. In this state, the positioning member 16 is in surface contact with the surface on the segment 1 side at the four inclined surfaces 18 a and 18 b of the truncated pyramid-shaped embedded portion 18 and the left and right protruding portions 22.

  Next, after the segments 1c and 1b are guided and brought close to each other, and necessary sealing materials are arranged between the joint surfaces 10a, 10b, and 10c, the exposed portions 20 of the positioning members 16 attached thereto are opposed to each other. It fits in the 2nd recessed part 14 formed in joining surface 10a, 10b, 10c. At this time, the two segments 1 are positioned in the thickness (diameter) direction and the axial direction by surface contact between the two inclined surfaces 20 a of the truncated pyramid-shaped exposed portion 20 and the two inclined surfaces 14 a of the second recess 14. In the state made, both are combined. In the same manner, after joining the large segments 1a, 1b, 1c and 1d, the small concrete segment 1e is moved in the axial direction and pushed between the concrete segments 1a and 1d by a wedge action. Similarly, it was confirmed that the positions of the recesses 12 and 14 of the joint surfaces 10a, 10b and 10c of the concrete segment 1e and the large segments 1a and 1d were matched, and the positioning member 16 did not hinder the construction. Later, the positioning member 16 is attached to the first recesses 12 of the opposing joint surfaces 10a, 10b, 10c of the segments 1e, 1a, 1d, and the segments 1 are coupled in the same manner.

  Since the positioning member 16 is detachably attached to the segment 1, when it is found that this hinders the construction after the installation, the construction can be advanced by removing the positioning member 16. Therefore, the positioning member 16 does not delay the work, and the work flexibility is high.

  Further, the positioning member 16 and the segment 1 are similar to each other in that a truncated pyramid-shaped convex portion (the embedded portion 18 and the exposed portion 20) and a concave portion (the first concave portion 12 and the second concave portion 14) are mutually connected. Since they are fitted, at least the truncated pyramid-shaped slope portions surely come into surface contact. Therefore, point contact and line contact do not occur as in the case of contact between curved surfaces, and a sufficiently large contact area between planes can be obtained, so that stress concentration on the concrete forming the segment 1 is prevented, The occurrence of cracks and the like due to this is reduced. Furthermore, in this embodiment, since the bottom surface on the exposed portion 20 side is formed larger than the embedded portion 18 side, the positioning member 16 is also supported by the end surface of the segment 1 in the overhang portion 22, thereby Stress concentration is further prevented, and the positioning member 16 is stably supported to enhance the positioning function.

  The positioning member can be made from various materials such as resin, ceramics, metal, or a composite material thereof. In particular, by preparing positioning members having different materials, shapes, and dimensions in advance, it is possible to appropriately select and use positioning members having characteristics according to the situation. For example, by changing only the height of the trapezoidal shape of the cross section of the exposed portion, it is possible to cope with the dimensional error of the recess.

  As described above, the present invention has been described according to the embodiment, but the present invention is not limited to this, and can be modified in accordance with the spirit of the invention. For example, in the above-described embodiment, two positioning members are disposed between the same pair of joint surfaces, but may be one or three or more. Similarly, the cross-sectional shape of the recess, the specific configuration of the engagement portion and the attachment portion, and the like can be selected as appropriate. In the embodiment, the first recess and the second recess are arranged on the same joint surface of one segment, but only one recess may be arranged on the same joint surface.

It is a perspective view which shows the structure which has the joining structure of the concrete member which concerns on embodiment of this invention. It is a figure which shows the method of the coupling | bonding of the assembly of the concrete member in embodiment of FIG. (A) And (b) is a figure which shows the structure of the side surface of a concrete member, Comprising: (a) is an AA arrow directional view of FIG. 2, (b) is a BB arrow directional view of FIG. FIG. It is sectional drawing which shows the joining structure of the concrete member of embodiment of FIG. It is a figure which shows the structure of a positioning member, (a) is a side view, (b) is a bottom view, (c) is a front view, (d) is a top view. It is a figure which shows the structure of a jig | tool, (a) is a front view which fractures | ruptures and shows, (b) is a side view, (c) is sectional drawing which follows the CC line of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete member 10a, 10b, 10c Side surface 14 Concave part 16 Positioning member 20 Convex part 27 Attachment part

Claims (3)

In a state where a positioning member is interposed between the side surfaces, the concrete members are joined by abutting the side surfaces,
A mounting portion and a recess on the side surface;
The mounting portion engages detachably with engaging portion at one end of the positioning member, the recess have a shape that fits to the convex portion formed at the other end of the positioning member,
The attachment portion is elastically fitted to the engagement portion to form a retaining structure.
A concrete member characterized by that. In a state where a positioning member is interposed between the side surfaces of a pair of concrete members, the concrete member joining structure is configured by abutting the side surfaces,
The positioning member has an engaging portion on one end side and a convex portion on the other end side,
One of the side surfaces is provided with an attachment portion that is detachably engaged with the engagement portion,
On the other of the side surfaces, a recess is formed that fits into the protrusion of the positioning member ,
The engagement portion is elastically fitted to the attachment portion to form a retaining structure,
A structure for joining concrete members characterized by the above. A positioning member that interposes between the side surfaces of a concrete member that has a mounting portion on a part of the side surface and a recess on the other part, and performs positioning when abutting the side surfaces,
Thereby releasably engage the mounting portion through the engagement portions on one end side, a convex portion formed on the other end side is adapted to fit into the recess,
The engagement portion is elastically fitted to the attachment portion to form a retaining structure.
A positioning member.

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