JP2015196999A - Joint structure of segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure for a K segment, the structure that can reliably prevent the K segment from sliding even if a shear force due to an axial force acts on the K segment when excavating a tunnel by a shield method.SOLUTION: A joint structure for a K segment includes: a groove 15 formed to a B segment 10, in a joint part between pieces of the K segment 1 and the B segment 10; a spring member 17 stored in the groove 15; a wedge-shaped member 18 biased toward the K segment 1 by the spring member 17; and a locking joint 12 configured by a groove 3 formed to the K segment 1.

Description

  The present invention relates to a joint structure for a K segment which is finally connected to one segment ring when excavating a tunnel by a shield method, and more particularly, constitutes one segment ring. Of the joints, the present invention relates to a joint structure in which only the K-segment joint is reinforced.

  When a tunnel is excavated by the shield method, the excavation hole is advanced by covering the inner wall of the excavation hole with a segment ring while excavating a natural ground with a shield machine. The segment ring used in the shield method is divided into a plurality of segments, carried near the face of the tunnel, and assembled along the inner diameter of the excavation hole.

  When assembling one segment ring by connecting the segments, the A segment and the B segment are connected, and finally the K segment is connected to the B segment.

  Thus, the K segment is the last segment to be assembled in one segment ring, and thus is structurally smaller than the other segments, ie, the A segment and the B segment, and thus K segment. The number of joints that can be installed between the segments connecting the segments is reduced.

  Since the K segment is assembled last, it has an insertion angle in the axial direction of the tunnel and a joint angle in the radial direction. Therefore, compared with the A segment and the B segment, the axial direction and radius of the tunnel In any direction, there is a problem in that the shearing force due to the axial force acts by these angles, and the sliding becomes easy.

  Nevertheless, in the past, segment joints of the same standard and specification were used for the A-segment, B-segment, and K-segment inter-ring joints and the inter-piece joints.

  Therefore, Patent Document 1 provides a gradient that abuts the gradient portion of the male joint in the fitting groove of the female joint while providing the male joint with a gradient portion that draws the joint surfaces together by fitting into the fitting groove of the female joint. A first gradient member that forms a first sliding surface by contacting the gradient member with the female joint, and a second gradient member that forms a second sliding surface by contacting the first gradient member The first gradient member is temporarily fixed at a predetermined position in the fitting groove of the female joint by the first temporary fixing member that loses the fixing function by receiving a force of a predetermined level or more, and the second gradient member is the first gradient member. An inter-member joint configured to be temporarily fixed to a member by a second temporary fastening member is disclosed.

JP 2007-56555 A

  However, in the joint between members disclosed in Patent Document 1, when the angle between the both side surfaces of the K segment in the radial direction and the axial direction of the tunnel is increased, the connection between the K segment and the B segment may not be sufficient. There was a problem that there was.

  Therefore, the present invention provides a K segment that can reliably prevent the K segment from sliding even when a shearing force is applied to the K segment when a tunnel is excavated by the shield method. An object of the present invention is to provide a joint structure.

  Such an object of the present invention is achieved by a joint structure for a K segment characterized in that a lock joint is provided at a joint part between the pieces of the K segment and the B segment.

  According to the present invention, since the K segment and the B segment are coupled by the lock joint, the K segment and the B segment can be firmly connected, and even if a shearing force due to an axial force acts on the K segment. , It is possible to reliably prevent the K segment from sliding.

  In a preferred embodiment of the present invention, the lock joint is formed in the B segment or the K segment by a groove formed in the K segment or the B segment, a spring member housed in the groove, and the spring member. It is comprised by the wedge-shaped member urged | biased and the groove | channel formed in the said B segment or the said K segment.

  According to a preferred embodiment of the present invention, the wedge-shaped member biased by the spring member in the groove formed in the K segment or the B segment is engaged in the groove formed in the B segment or the K segment. Since the K segment is connected to the B segment, the K segment and the B segment can be firmly connected, and even if a shearing force due to an axial force acts on the K segment, it is ensured that the K segment slides. It becomes possible to prevent.

  The object of the present invention is also such that a step is formed on a side surface of the K segment or B segment facing the B segment or the K segment, and the side surface of the B segment or the K segment facing the K segment or the B segment. A step having a shape complementary to the step formed on the side surface of the K segment or the B segment, and the B segment or the step formed on the side surface of the K segment or the B segment This is achieved by a joint structure for K segments, characterized in that an inter-ring joint capable of connecting the K segments is provided.

  According to the present invention, a step is formed on the side surface of the K segment that faces the B segment, and a step that is complementary to the step provided on the K segment is provided on the side surface of the B segment that faces the K segment. An inter-ring joint capable of connecting the B segment is provided at the step portion provided in the segment, or a step is formed on the side surface of the B segment facing the K segment, and on the side surface of the KB segment facing the B segment. A step having a shape complementary to the step provided in the B segment is provided, and an inter-ring joint capable of connecting the KB segment is provided in the step provided in the B segment. Even when a shearing force is applied, the K segment can be reliably prevented from sliding.

  ADVANTAGE OF THE INVENTION According to this invention, even if the shear force by axial force acts on K segment, it becomes possible to provide the joint structure for K segment which can prevent reliably sliding of K segment. .

FIG. 2 is a schematic cross-sectional view of a joint structure for a K segment according to a preferred embodiment of the present invention, showing a state before the K segment and the B segment are connected. FIG. 2 is a schematic front view of a surface to be brought into contact with the K segment of the B segment along the line AA in FIG. FIG. 3 is a schematic front view of the surface to be brought into contact with the B segment of the K segment along the line B-B in FIG. 1. FIG. 4 is a schematic enlarged plan view of the groove of the K segment and the lock member of the B segment connected to the groove of the K segment. FIG. 5 is a schematic plan view showing a state immediately before the K segment is connected to the B segment. FIG. 6 is a schematic enlarged cross-sectional view of the groove portion of the B segment and the groove portion of the K segment shown in FIG. FIG. 7 is a schematic cross-sectional view showing a state in which the K segment is connected to the B segment. FIG. 8 is a schematic enlarged cross-sectional view of the groove portion of the B segment and the groove portion of the K segment shown in FIG. FIG. 9 is a conventional schematic cross-sectional view showing a connection state of the K segment and the B segment. FIG. 10 is a conventional schematic cross-sectional view showing a connection state of the K segment and the B segment. FIG. 11 is a schematic cross-sectional view of a joint structure for a K segment according to a preferred embodiment of the present invention.

  FIG. 1 is a schematic cross-sectional view of a joint structure for a K segment according to a preferred embodiment of the present invention, showing a state before the K segment and the B segment are connected.

  As shown in FIG. 1, the K segment 1 and the B segment 10, 10 have an angle with respect to the axial direction of the tunnel of the circumferential side surface 1 a of the segment ring of the K segment 1. 10 and 10 are formed so as to be equal to the angle of the side surface 10a with respect to the axial direction of the tunnel.

  As shown in FIG. 1, two side-pass one-pass joint portions 2, 2 are provided on the circumferential side surface 1 a of the segment ring of the K segment 1, respectively. A groove 3 is formed between them. In FIG. 1, reference numeral 5 is a K segment 1 inter-ring joint.

  As shown in FIG. 1, each of the side surfaces 10 a and 10 a facing the K segment 1 of the B segment 10 and 10 to which the K segment 1 is to be connected has two one-pass joint portions 2 between the two pieces of the K segment 1, The two-piece one-pass joint portions 11, 11 to be connected to the two pieces are provided, and the lock member 12 connected to the groove 3 of the K segment 1 is provided between the two-piece one-pass joint portions 11, 11. ing. In FIG. 1, reference numeral 14 is an inter-ring joint of the B segment 10.

  FIG. 2 is a schematic front view of the surface of the B segment 10 that should come into contact with the K segment 1 along the line AA in FIG.

  As shown in FIG. 2, the inter-piece one-pass joint portions 11, 11 are provided on the surface 10 a of the B segment 10 facing the K segment 1, and the inter-piece one-pass joint portions 11, 11 are provided with a K segment. A lock member 12 connected to one groove 3 is provided.

  FIG. 3 is a schematic front view of a surface to be brought into contact with the B segment 10 of the K segment 1 along the line BB in FIG.

  As shown in FIG. 3, two pieces of one-pass joint portions 2, 2 are provided on the surface 1 a to be in contact with the B segment 10 of the K segment 1. A groove 3 is formed between them.

  FIG. 4 is a schematic enlarged plan view of the groove 3 of the K segment 1 and the lock member 12 of the B segment 10 connected to the groove 3 of the K segment 1.

  As shown in FIG. 4, the lock member 12 of the B segment 10 includes a groove 15, and the spring member 17 and the spring member 17 urge the lock member 12 toward the K segment 1 in the groove 15 of the lock member 12. The wedge-shaped member 18 is disposed.

  As shown in FIG. 4, the surface 18 a facing the side surface 1 a of the K segment 1 of the wedge-shaped member 18 has the same inclination as the inclination of the side surface 1 a of the K segment 1.

  FIG. 5 is a schematic cross-sectional view showing a state immediately before the K segment 1 is connected to the B segments 10 and 10, and FIG. 6 shows the groove 15 and the K segment of the B segment 10 and 10 shown in FIG. 5. FIG. 3 is a substantially enlarged cross-sectional view of one groove 3.

  As shown in FIG. 5, in connecting the K segment 1 to the B segments 10, 10, the K segment 1 is inserted between the B segments 10, 10 along the tunnel axial direction.

  As described above, the K segment 1 and the B segment 10, 10 have an angle with respect to the axial direction of the tunnel of the circumferential side surface 1 a of the segment ring of the K segment 1. The side surfaces 10a and 10a of the K segment 1 are formed to be equal to the angle with respect to the axial direction of the tunnel. The spring members 17 housed in the grooves 15 formed in the locking members 12 of the B segments 10 and 10 Since the surface 18a of the wedge-shaped member 18 urged toward the side surface 1a faces the side surface of the K segment 1 has the same inclination as that of the side surface 1a of the K segment 1, as shown in FIG. When the distance between the side surface 1a of the K segment 1 and the side surfaces 10a and 10a of the B segment 10 and 10 becomes smaller, the B segment 10 and 10 The surface 18a of the wedge-shaped member 18 urged toward the side surface 1a of the K segment 1 by the spring member 17 accommodated in the groove 15 formed in the groove member 12 comes to follow the side surface 1a of the K segment 1. .

  FIG. 7 is a schematic cross-sectional view showing a state in which the K segment 1 is connected to the B segments 10 and 10, and FIG. 8 shows the groove 15 of the B segment 10 and 10 and the K segment 1 shown in FIG. 7. 3 is a substantially enlarged cross-sectional view of a groove 3. FIG.

  As shown in FIG. 7, when the K segment 1 is connected to the B segments 10, 10, the one-pass joint portions 2, 2 between the K segments 1 and the one-pass joint portions between the pieces of the B segments 10, 10 11 and 11 are coupled, and a wedge-shaped member 18 biased toward the K segment 1 is fitted into the groove 3 of the K segment 1 by the spring member 17 provided in the groove 15 of the B segment 10, 10. Thus, the K segment 1 is firmly connected to the B segments 10 and 10.

  According to this embodiment, the grooves 3, 3 are formed in the circumferential side surfaces 1a, 1a of the segment ring of the K segment 1, and the circumferential side surfaces 10a, 10a of the segment ring of the B segment 10, 10 are At positions corresponding to the grooves 3 formed on the circumferential side surface 1 a of the segment ring of the segment 1, the grooves 15, 15, the spring members 17, 17 arranged in the grooves 15, 15, and the spring members 17, 17 , Lock members 12, 12 having wedge-shaped members 18, 18 biased toward the side surface 1 a of the K segment 1 are provided, and wedge-shaped members 18 of the lock members 12, 12 provided on the B segments 10, 10, 18 is engaged with the grooves 3 and 3 of the K segment 1, and the wedge members 18 and 18 are connected to the K segment by spring members 17 and 17 provided in the grooves 15 and 15 of the lock members 12 and 12. Since the K segment 1 can be firmly connected to the B segments 10 and 10 even if shearing force due to an axial force is applied, the K segment 1 It is possible to reliably prevent the sliding.

  9 and 10 are schematic cross-sectional views showing the connection state of the conventional K segment 1 and B segments 10 and 10.

  FIG. 9 shows a case where the angle between the side surface in the radial direction of the segment ring of the K segment 1 and the tunnel axis direction is large. Thus, when the angle between the radial side surface of the segment ring of the K segment 1 and the tunnel axial direction is large, the shearing force due to the axial force acts on the K segment 1 and the K segment 1 slides. It becomes easy.

  FIG. 10 shows a case where the shear force due to the axial force acting on the K segment 1 is reduced by reducing the angle between the radial side surface of the segment ring of the K segment 1 and the tunnel axial direction. However, this method is intended only to reduce the shear force due to the axial force acting on the K segment 1, and does not attempt to fundamentally solve the problem that the K segment 1 slides.

  FIG. 11 is a schematic cross-sectional view of a joint structure for a K segment according to another preferred embodiment of the present invention, in which the angle between the radial side surface of the segment ring of the K segment 1 and the tunnel axis direction is reduced. Without trying, it is intended to fundamentally prevent the K segment 1 from sliding.

  As shown in FIG. 11, in this embodiment, a step B is formed on the radial side surface of the segment ring of the K segment 1, and the B segment is opposed to the radial side surface of the segment ring of the K segment 1. Steps 25 and 25 having a shape complementary to steps 20 and 20 on the side surface in the radial direction of the K segment 1 are provided on the side surfaces 10 and 10.

  As shown in FIG. 11, in this embodiment, inter-ring joints 22 and 22 are respectively provided in the portions where the steps 20 and 20 of the K segment 1 are formed. Segment 1 is connected to B segments 10 and 10.

  According to this embodiment, the K segment 1 is provided with the steps 20 and 20, and the B segment 10 and 10 is provided with the steps 25 and 25 having a shape complementary to the steps 2 and 20. Inter-segment joints 22, 22 having the same specifications as the inter-ring joints 5, 14 are provided at the steps 20, 20. Since it is connected to the segments 10 and 10, the K segment can be firmly connected to the B segments 10 and 10, thus ensuring that the K segment 1 slides even when a shearing force due to an axial force is applied. It becomes possible to prevent.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  For example, in the embodiment shown in FIGS. 1 to 8, grooves 3 and 3 are formed in the circumferential side surfaces 1 a and 1 a of the segment ring of the K segment 1, and the K segment 1 of the B segments 10 and 10 is formed in the K segment 1. The opposed side surfaces 10a and 10a are urged toward the side surfaces 1a and 1a of the K segment 1 by the grooves 15 and 15, spring members 17 and 17 disposed in the grooves 5 and 15, and the spring members 17 and 17, respectively. Lock members 12 and 12 having wedge-shaped members 18 and 18 are provided, and the wedge-shaped members 18 and 18 of the lock members 12 and 12 are engaged with grooves 3 and 3 formed on both side surfaces 1a and 1a of the K segment 1. By joining, the K segment 1 and the B segments 10 and 10 are connected, but the grooves are disposed on both side surfaces 1a and 1a in the circumferential direction of the segment ring of the K segment 1 and are disposed in the grooves. And a lock member having a wedge-shaped member biased toward the side surfaces 10a and 10a of the B segment 10 and 10 facing the K segment 1 is formed by the spring member. Grooves are respectively formed on the side surfaces 10a and 10a facing the K segment 1, and the wedge-shaped members of the locking members provided on the K segment 1 are formed on the side surfaces 10a and 10a of the B segment 10 and 10 facing the K segment 1. The K segment 1 and the B segments 10 and 10 may be coupled by engaging with the formed groove.

  Further, in the embodiment shown in FIG. 11, steps 20, 20 are formed on the radial side surface of the segment ring of the K segment 1, and the B segment 10 facing the radial side surface of the segment ring of the K segment 1. Steps 25 and 25 having shapes complementary to the radial side surface steps 20 and 20 of the K segment 1 are provided on the 10 side surfaces, and the step portions 20 and 20 on the radial side surface of the segment ring of the K segment 1 are provided. Although the ring-to-ring joint is provided in the portion, the ring-to-ring joint may be provided in the steps 25 and 25 formed on the side surfaces of the B segments 10 and 10.

1 K segment 2 K segment piece one-pass joint 3 K segment groove 5 K segment ring joint 10 B segment 11 B segment piece one pass joint 12 Lock member 14 B segment ring joint 15 B segment A groove member 17 of the locking material portion 18 A spring member 18 of the locking material portion of the B segment 20 A wedge-shaped member 20 of the locking material portion of the B segment 22 A step 22 provided in the K segment 25 An inter-segment joint 25 provided in the K segment Step

Claims (3)

  A joint structure for a K segment, wherein a lock joint is provided at a joint portion between pieces of the K segment and the B segment.   The lock joint includes a groove formed in the K segment or the B segment, a spring member housed in the groove, and a wedge-shaped member biased toward the B segment or the K segment by the spring member. The joint structure for the K segment according to claim 1, wherein the joint structure is formed by a groove formed in the B segment or the K segment.   A step is formed on a side surface of the K segment or B segment that faces the B segment or the K segment, and the side surface of the B segment or the K segment that faces the K segment or the B segment has the step of the K segment or the B segment. A segment having a shape complementary to the step formed on the side surface of the segment, and the B segment or the K segment being connectable to the step portion formed on the side surface of the K segment or the B segment. A joint structure for a K segment characterized by providing an inter-joint.

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