JP5335524B2 - Segment joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-weight joint structure of segments, which can be manufactured inexpensively using a plate material. <P>SOLUTION: The joint structure of the segments is formed by fitting together an insertion metal part 3 disposed on one peripheral end face 2a of the segment 2 forming the outer shell of a tunnel 1 and a receiving metal part 4 disposed on the other end face 2b. The insertion metal part 3 has a platelike body 31 and projecting-stripe portions 32 and 32 extended at opposed positions on the plate faces at both sides of the body 31. The receiving metal part 4 includes: a housing 41 formed of a pair of parallel plates 41a and 41a; and a pair of teeth 42 and 42 extended on the opposed plate faces of the parallel plate 41a and 41a.When the inner faces of the projecting-stripe portions of the insertion metal part is brought into contact with the inner faces of the teeth portions of the receiving metal part and then moving one of segments, the insertion metal part and the receiving metal part are fitted together. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a joint structure in the circumferential direction of a segment used for lining a shield tunnel.

  Conventionally, it is known that when a cylindrical tunnel lining is assembled by joining a plurality of arcuate plate-shaped segments in the circumferential direction, a fitting-type connector is used (Patent Document 1). , 2 etc.).

  In Patent Documents 1 and 2, a cast metal fitting in which a widened head is formed at the tip of a support portion having a width of about the width of the slit is compared with a cast metal fitting in which a cavity is formed in the back of the slit. There is disclosed a fitting-type joint structure that is connected by fitting.

  In this way, a joint structure that slides the other segment with the insertion fitting provided on the end face in the axial direction of the tunnel to the fitting provided on the end face of one segment and fits the receiving fitting with the insertion fitting. Various structures have been proposed and disclosed (see Non-Patent Document 1, etc.).

JP 2005-16234 A JP 2005-16235 A

Yutaka Fujino, 5 others, “Development of hook joints (inter-segment joints) -Joint bending test-", Abstracts of the 59th Annual Conference of the Japan Society of Civil Engineers, September 2004, p. 779-780

  However, the connecting tools used in the fitting-type joint structures disclosed in Patent Documents 1 and 2 have many custom-made castings that are integrally formed, and the manufacturing cost tends to increase. In addition, the integrally molded casting tends to increase in weight, which is an obstacle to reducing the weight of the segment.

  Non-Patent Document 1 discloses an inter-segment joint in which an insertion fitting (M hardware) and a receiving fitting (F hardware) are manufactured by combining plate materials. If a large external force is applied in the opening direction (the thickness direction of the segment), the metal fitting may be deformed.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a segment joint structure that can be manufactured at a low cost and at a low cost by using a plate material and has high rigidity.

  In order to achieve the above object, the segment joint structure of the present invention includes an insertion fitting provided on one end face in the circumferential direction of a segment forming the outer shell of the tunnel, and a receiving fitting provided on the other end face. The insertion fitting is protruded in the circumferential direction from the plate-like main body portion having a plate surface extending in the axial direction and the circumferential direction of the tunnel, and the one end surface. In the state which protruded with respect to the plate | board surface of the said main-body part embed | buried in the inside of the said segment, the protrusion part extended toward the said axial direction in the position which the plate | board surface of the both sides of the said main-body part opposes. A fixing portion extending in the axial direction, and the metal fitting is formed by a pair of parallel plates spaced apart by a wider width than the thickness of the main body portion plus the thickness of the protruding portion. And the storage portion near the other end surface A pair of teeth extending in the axial direction on the opposing plate surfaces of the row plate at an interval wider than the thickness of the main body portion and narrower than the thickness of the ridge, and between the parallel plates, the segment is more than the tooth portion. An interval holding portion to be connected on the inner side, and a fixing portion extending in the axial direction in a state of protruding from the outer surface of the accommodating portion embedded in the segment, When the inner surface of the protrusion is brought into contact with the inner surface of the tooth portion of the receiving metal and one of the segments is moved in the axial direction, the insertion metal fitting and the receiving metal are fitted together. And

  Here, the ridge portion extends obliquely with respect to the one end surface, and the tooth portion extends obliquely with respect to the other end surface at an angle that matches the angle of the ridge portion. It can be set as the structure provided.

  Moreover, tetrafluororesin coating or powder coating can be applied to the surface where the insertion fitting and the receiving fitting contact each other.

  In the segment joint structure of the present invention configured as described above, both the insertion fitting and the receiving fitting are manufactured using a plate material such as a steel plate.

  For this reason, the metal fitting used for a joint structure can be manufactured lightweight and cheaply. In addition, since the parallel plates of the metal fittings are connected to each other by an interval holding portion on the inner side of the tooth portion, it is necessary to reliably resist external forces in the direction in which the interval between the parallel plates opens (segment thickness direction). Can do.

  Further, the mounting positions of the protrusions and teeth extending on the plate material and the interval between the parallel plates can be easily adjusted, so that it can be quickly adapted to segments of various shapes and sizes.

  In addition, by extending the ridges of the insertion fitting and the teeth of the receiving fitting obliquely with respect to the end surface of the segment, it becomes easier to insert the fitting and the segments can be joined in a short time. Therefore, high-speed construction can be realized.

  Further, by applying tetrafluororesin coating or powder coating to the surface where the insertion fitting and the receiving fitting abut, the frictional resistance when the insertion fitting slides with respect to the receiving fitting is greatly reduced. As a result, the segment can be smoothly moved in the axial direction of the tunnel without generating excessive stress inside the segment.

It is a perspective view explaining the process of assembling a segment in order to construct | assemble the joint structure of the segment of embodiment of this invention. It is a figure explaining the structure of an insertion metal fitting, Comprising: (a) is the side view seen in the tunnel axial direction, (b) is the top view seen in the AA direction of (a), (c) is (b) It is the front view seen in the BB direction (tunnel circumferential direction). It is a figure explaining the structure of a catch metal, Comprising: (a) is a side view seen in the tunnel axial direction, (b) is a sectional view seen in CC direction of (a), (c) is (b) It is the front view which looked at the receiving metal fitting in DD direction (tunnel circumferential direction). It is a figure explaining the structure of a segment, Comprising: (a) is a side view seen in the tunnel axis direction, (b) is an inner peripheral view seen in the EE direction of (a), (c) is (a) It is the front view seen in the FF direction (tunnel circumferential direction). It is a cross-sectional view explaining the structure of the tunnel with which the segment was assembled | attached.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view for explaining a process of constructing a tunnel 1 by combining segments 2... Provided with a joint structure of a segment 2 according to the present embodiment.

  The segment 2 is an arc plate-like member that forms the outer shell of the cylindrical tunnel 1, and an insertion fitting 3 and a receiving fitting 4 are provided side by side on one end surface 2 a in the circumferential direction. A receiving metal fitting 4 and an insertion metal fitting 3 are provided side by side on the end surface 2b.

  As shown in FIG. 2, the insertion fitting 3 is formed by a main body portion 31 formed of a rectangular plate-shaped steel plate, and square columnar steel square members respectively extending on the plate surfaces on both sides of the main body portion 31. And a fixing plate 33 as a fixing portion fixed to the end surface of the main body portion 31 in a direction orthogonal to the plate surface.

  The main body 31 is attached to the segment 2 so that the plate surface extends in the axial direction and the circumferential direction of the tunnel 1. That is, the vertical direction in FIG. 2B is the axial direction of the tunnel 1, and the horizontal direction is the circumferential direction of the tunnel 1.

  Moreover, the protrusion part 32 protrudes in the direction orthogonal to the plate | board surface used as the thickness direction of the main-body part 31, as shown to Fig.2 (a). The thickness direction of the main body 31 is also the thickness direction for the segment 2 (the radial direction of the tunnel 1).

  Further, as shown in FIGS. 2A and 2B, the protrusion 32 is provided in the vicinity of the end surface of the main body 31 in the circumferential direction of the tunnel. As shown in FIG. 1, a portion where the protruding portion 32 is extended protrudes from the end surface 2 a of the segment 2 in the circumferential direction and is exposed to the outside of the segment 2.

  Further, as shown in FIG. 2 (b), the ridge portion 32 extends obliquely at an angle θ 1 with respect to the end surface of the main body portion 31. Since the end face of the main body 31 is parallel to the end face 2a of the segment 2, the ridge 32 is extended obliquely with respect to the end face 2a.

  Furthermore, since the receiving metal fitting 4 slides from the bottom to the top as viewed in FIG. 2B with respect to the insertion fitting 3, the protrusion 32 is inserted into the receiving metal fitting 4. As it extends in the axial direction of the tunnel 1 in an increasing direction, it extends obliquely so as to be separated from the end surface 2a. 2 is provided in front of the end face 2a of the left segment 2 in FIG.

  In addition, the protrusion 32 is fixed to the main body 31 by a fillet weld 34 </ b> A that is built up between the outer surface of the protrusion 32 and the plate surface of the main body 31. Further, the longitudinal end surface of the protrusion 32 remains at a position slightly inside the side surface of the main body 31.

  Further, the fixing plate 33 is formed of a rectangular steel plate having a width wider than the thickness of the protrusions 32 and 32 added to the thickness of the main body 31. The fixing plate 33 is fixed to an end surface embedded in the segment 2 on the side opposite to the end surface on the side where the protrusions 32, 32 of the main body 31 are extended.

  That is, the fixing plate 33 is brought into contact with the end surface of the main body 31 in a direction orthogonal to the plate surface of the main body 31 and is fixed to the main body 31 via the welded portions 34B and 34B.

  On the other hand, the receiving metal fitting 4 shown in FIG. 3 extends to the accommodating portion 41 formed by a pair of parallel plates 41a and 41a spaced apart from each other by a distance larger than the thickness of the ridge, and the plate surfaces facing the parallel plates 41a and 41a. A pair of tooth portions 42, 42 provided, connecting plates 44, 44 as interval holding portions spanned between the parallel plates 41a, 41a on the inner side of the segment 2 from the tooth portions 42, 42, and the parallel plate 41a , 41a, and a pedestal plate 43 serving as a fixing portion spanned between the end faces.

  These parallel plates 41a and 41a are juxtaposed so that the main body 31 of the insertion fitting 3 accommodated between them and the plate surface are substantially parallel to each other, and the end surfaces of the parallel plates 41a and 41a on the inner side of the segment 2 A steel plate having a width wider than the interval between the parallel plates 41 a and 41 a is attached as a pedestal plate 43.

  That is, the pedestal plate 43 protrudes in a direction (the thickness direction of the segment 2) perpendicular to the outer side surfaces of the parallel plates 41a and 41a embedded in the segment 2. And the side surface which the base plate 43 protruded, and the outer surface of the parallel plate 41a are joined via the fillet weld part 45B. Here, the pedestal plate 43 is provided as a fixing unit, but also functions as an interval holding unit that holds an interval between the parallel plates 41a and 41a.

  Further, the connecting plate 44 is formed of a rectangular steel plate, and by fixing both ends in the longitudinal direction of the connecting plate 44 to the side end surfaces of the parallel plates 41a and 41a, the interval between the parallel plates 41a and 41a is as follows. Held constant.

  Further, the tooth portions 42, 42 are formed of a square pillar-shaped steel square member, and as shown in FIGS. 3A and 3B, the end surface opposite to the end surface of the accommodating portion 41 to which the base plate 43 is attached. It is extended in the vicinity. The end surface of the accommodating portion 41 on the side where the tooth portions 42 are provided is aligned with the other end surface 2 b of the segment 2.

  Further, the pair of tooth portions 42 and 42 are extended to face each other with an interval wider than the thickness of the main body portion 31 of the insertion fitting 3 and narrower than the thickness of the protrusion. For example, the interval between the teeth 42 and 42 is slightly wider than the thickness of the main body 31 and is wide enough to ensure a gap of about 2 mm or less with the main body 31 after fitting.

  Furthermore, as shown in FIG. 3B, the tooth portion 42 extends obliquely at an angle θ2 with respect to the end surface of the parallel plate 41a. Since the end surface of the parallel plate 41a is flush with the end surface 2b of the segment 2 as described above, the tooth portion 42 extends obliquely with respect to the end surface 2b.

  Further, since the insertion fitting 3 slides from the bottom to the top as viewed in FIG. 3B with respect to the receiving fitting 4, this tooth portion 42 is formed from the side where the insertion fitting 3 is inserted. As it extends in the axial direction of the tunnel 1, it extends obliquely so as to be separated from the end face 2 b. 3 is provided on the front side of the end surface 2b of the right segment 2 in FIG.

  Further, the tooth portion 42 is fixed to the parallel plate 41a by a fillet weld portion 45A that is built up between the outer surface of the tooth portion 42 and the plate surface that is the inner surface of the parallel plate 41a.

  Further, the insertion fitting 3 and the receiving fitting 4 are subjected to tetrafluororesin coating or powder coating on the surfaces. By applying the tetrafluoride resin coating or the powder coating in this manner, the frictional resistance between the surfaces where the insertion fitting 3 and the receiving fitting 4 come into contact is reduced, and an anticorrosion effect can be obtained.

  And the insertion metal fitting 3 and the receiving metal fitting 4 which were demonstrated above are each attached to the end surfaces 2a and 2b of the segment 2, as shown in FIG. In addition, although this segment 2 is integrally manufactured by a factory with steel materials and concrete, in order to clarify the structure of a steel material part in FIG. 4, illustration of the concrete with which an inside is filled is abbreviate | omitted.

  As shown in FIG. 4A, the segment 2 is formed with a skin plate 21 obtained by bending a steel plate in an arc shape in a side view as an outer peripheral surface. Further, end surfaces 2 a and 2 b that are substantially orthogonal to the inner peripheral surface of the skin plate 21 are formed of steel plates at end portions in the circumferential direction of the skin plate 21.

  Then, as shown in FIGS. 4B and 4C, the insertion fitting 3 and the receiving fitting 4 are attached to the end faces 2 a and 2 b in a straight line in the axial direction of the tunnel 1.

  Moreover, the insertion fitting 3 is attached so that the protruding portion 32 protrudes from the end surface 2a in the circumferential direction, as shown on the right end surface 2a of the segment 2 in FIG. The protruding length in the circumferential direction of the insertion fitting 3 is such that the insertion fitting 3 and the receiving fitting 4 are fitted to each other in a state where the end surface 2a of one segment 2 and the end surface 2b of the other segment 2 are in contact with each other. The length is set such that the inner surface of the portion 32 and the inner surfaces of the tooth portions 42 and 42 abut.

  Furthermore, the end surfaces 2a and 2b of the segment 2 are formed with recesses that become the insertion ports 40 adjacent to the receiving metal fitting 4 as shown in FIG. The insertion port 40 communicates with the space between the parallel plates 41a and 41a of the accommodating portion 41. When the distal end of the insertion fitting 3 is inserted into the insertion port 40 and the segment 2 is moved in the axial direction of the tunnel 1, The protrusions 32 and 32 of the insertion fitting 3 are accommodated in the accommodation portion 41 of the receiving fitting 4.

  A plurality of shape retaining plates 22,... Extend from the inner peripheral surface of the skin plate 21 of the segment 2 toward the center of the tunnel 1. Further, a reinforcing bar 23 is arranged inside the segment 2. In addition, a gripping bracket 24 for gripping the segment 2 by an erector device is attached to the center of the segment 2 on the inner peripheral surface side of the skin plate 21.

  Further, the segment 2 is formed with arc-shaped side surfaces 2 c and 2 d in the axial direction of the tunnel 1. Further, the side surfaces 2c and 2d are provided with a plurality of inter-ring joint ports 51,... And inter-ring joint rods 52,.

  When the segment 2 is moved in the axial direction of the tunnel 1, the inter-ring joint rod 52 is inserted into the inter-ring joint port 51 of the segment 2 arranged in advance at the opposite position, and the axial direction of the tunnel 1. The segments 2 and 2 are joined.

  FIG. 5 shows a cylindrical shape by the five arc plate-like segments 2,... Described above, the two segments 6, 6, and the trapezoidal segment 7 arranged on the top. It is sectional drawing of the assembled tunnel 1. FIG.

  Here, in order to fit the insertion fitting 3 and the receiving fitting 4, the segment 2 is first moved in the circumferential direction to insert the insertion fitting 3 into the insertion port 40, and then the segment 2 is inserted in the axial direction of the tunnel 1. Will be moved. For this reason, the joint structure of all the segments around the tunnel 1 cannot be constituted by the insertion fitting 3 and the receiving fitting 4.

  Therefore, the segments 2,... Arranged below the tunnel 1 have the insertion fitting 3 and the receiving fitting 4 attached to both end faces 2a, 2b, and the segment 7 to be inserted last moves in the axial direction of the tunnel 1. It is a joint that covers the entire length in the axial direction so that the assembly can be performed only by means of

  And the joint which fits to the joint of the segment 2 and 7 to be joined is provided in the end surface of the segment 6 arrange | positioned between the segment 2 and the segment 7, respectively, These segments 2, ..., 6,7 To form a cylindrical lining.

  Next, the effect | action of the joint structure of the segment 2 of this Embodiment is demonstrated.

  In the joint structure of the segment 2 of the present embodiment configured as described above, both the insertion fitting 3 and the receiving fitting 4 are manufactured using steel plates. For this reason, the metal fitting (3, 4) used for a joint structure can be manufactured lightweight and cheaply.

  In addition, since the parallel plates 41 a and 41 a of the metal fitting 4 are connected to each other by the connection plate 44 on the inner side than the tooth portions 42 and 42, the parallel plates 41 a and 41 a are parallel from the inside of the housing portion 41 via the main body 31 of the insertion metal fitting 3. Even if an external force acts in the direction in which the distance between the plates 41a and 41a opens (the thickness direction of the segment 2), it can be reliably resisted. And if it is the structure which connects between the parallel plates 41a and 41a with the connection plate 44 in this way, the highly rigid receiving metal fitting 4 can be manufactured easily with sufficient precision.

  Furthermore, since the protrusion part 32 extended to the main-body part 31 and the tooth | gear part 42 extended to the parallel plate 41a are formed by fixing a square bar and a steel bar to a steel plate, the attachment position or angle is Can be easily changed according to the design. Furthermore, the interval between the parallel plates 41a and 41a can be easily adjusted. For this reason, even if the size of the tunnel 1 or the shape of the segment 2 is changed and the shapes of the desired insertion fitting 3 and receiving fitting 4 are changed, it is possible to quickly respond.

  Further, the protrusion (32) of the insertion fitting (3) and the tooth portion (42) of the receiving fitting (4) are extended obliquely with respect to the end faces (2a, 2b) of the segment (2), thereby facilitating the insertion of the fitting (3, 4). The segments 2 and 2 can be joined in a short time. Furthermore, if the insertion fitting 3 and the receiving fitting 4 are easily fitted, the assembly work of the segment 2 can be automated, and high-speed construction of the entire tunnel 1 construction can be realized.

  Further, by applying tetrafluororesin coating or powder coating on the surface where the insertion fitting 3 and the receiving fitting 4 abut, the frictional resistance during sliding of the insertion fitting 3 with respect to the receiving fitting 4 is greatly reduced. . When this frictional resistance is large, a large stress is generated due to twisting or bending inside the segment 2 to which the insertion fitting 3 or the receiving fitting 4 is fixed, causing damage to the segment 2, but the frictional resistance is small. If this is the case, excessive stress is not generated inside the segment 2. Furthermore, if the frictional resistance is small, the segment 2 can be smoothly moved in the axial direction of the tunnel 1 with a small force.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  For example, in the above-described embodiment, the case where the insertion fitting 3 and the receiving fitting 4 are provided in a synthetic segment that is manufactured in advance in a factory or the like so that the steel material and the concrete are integrated has been described. Instead, the insertion fitting 3 and the receiving fitting 4 can be attached to a concrete segment or a steel segment at a factory or the like. Moreover, when using a steel segment, concrete can also be filled after assembling.

  Moreover, in the said embodiment, although the insertion metal fitting 3 and the receiving metal fitting 4 were each provided in each of the end surfaces 2a and 2b of the segment 2, it is not limited to this, One or two on one end surface 2a The structure of providing the some insertion metal fitting 3 and providing the one or some receiving metal fitting 4 in the other end surface 2b may be sufficient.

DESCRIPTION OF SYMBOLS 1 Tunnel 2 Segment 2a, 2b End surface 3 Insertion metal fitting 31 Main-body part 32 Projection part 33 Fixing plate (fixing part)
4 Receptacle 41 Housing 41a Parallel Plate 42 Teeth 43 Base Plate (Fixing Unit, Spacing Holding Unit)
44 Connecting plate (interval holder)
θ1, θ2 angle (oblique)

Claims (3)

A joint structure of a segment for fitting an insertion fitting provided on one end face in the circumferential direction of a segment forming the outer shell of the tunnel and a receiving fitting provided on the other end face,
The insertion metal fitting is opposed to a plate-like main body portion having a plate surface extending in the axial direction and the circumferential direction of the tunnel, and plate surfaces on both sides of the main body portion protruding from the one end surface in the circumferential direction. A protrusion extending in the axial direction at a position, and a fixing portion extending in the axial direction in a state of protruding from the plate surface of the main body embedded in the segment. Prepared,
The receiving bracket includes an accommodating portion formed by a pair of parallel plates spaced apart from the thickness of the main body portion plus the thickness of the protruding portion, and the vicinity of the other end surface. A pair of teeth extending in the axial direction on the opposite plate surfaces of the parallel plate at an interval wider than the thickness of the main body portion and narrower than the thickness of the ridge, and between the side end surfaces of the parallel plate than the tooth portions A connecting plate that is connected on the inner side of the segment, and a fixing portion that extends in the axial direction in a state of protruding from the outer surface of the accommodating portion that is embedded in the segment . A pedestal plate spanned between the end faces ,
When one of the segments is moved in the axial direction by bringing the inner surface of the protruding portion of the insertion fitting into contact with the inner surface of the tooth portion of the receiving fitting, the insertion fitting and the receiving fitting are fitted. A joint structure of segments characterized by being combined.   The protruding portion extends obliquely with respect to the one end surface, and the tooth portion extends obliquely with respect to the other end surface at an angle that matches the angle of the protruding portion. The joint structure for a segment according to claim 1.   The joint structure of a segment according to claim 1 or 2, wherein a surface on which the insertion fitting and the receiving fitting contact each other is subjected to tetrafluororesin coating or powder coating.

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