JP2007056555A - Joint between members - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint between members having excellent work efficiency and stability for easily joining K-segment fitting parts or the like of a shield tunnel without needing excessive insertion force. <P>SOLUTION: The joint is composed of a female joint 2 having a fitting groove 4, and a male joint 1. The male joint 1 is provided with a gradient part for drawing the joint faces to each other by fitting the male joint 2 into the fitting groove 4. A gradient member abutting on the gradient part of the male joint 1 is provided in the fitting groove 4 of the female joint 2. The gradient member is provided in two stages of a first gradient member 5a abutting on the female joint 2 to form a first sliding surface 7a, and a second gradient member 5b abutting on the first gradient member 5a to form a second sliding surface 7b. The first gradient member 5a is temporarily fixed into a predetermined position in the fitting groove of the female joint 2 by a first temporary fastening member 7a losing a fixing function upon receiving the force of a predetermined value or more. The second gradient member 5b is temporarily fixed to the first gradient member 5a by a second temporary fastening member 7b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of a joint between members for connecting members such as a structure, and can be used for connecting a segment used for a shield tunnel or a united building structure member, for example.

  Conventionally, a method using bolts and nuts is well known as a joint between members of a structure. This method is also commonly used for connecting segments used in shield tunnels. However, in order to robotize the assembly, bolt joining is complicated and requires extremely advanced technology and costs. It becomes expensive.

  For this reason, a boltless joint structure having a predetermined strength has been developed without using bolts and nuts. Joining segments using boltless joints is a method of pushing the segment piece to be joined next to the existing segment piece in the tunnel axis direction using a jack for propulsion of the shield machine when assembling the segment piece. Many are commonly referred to as one-pass mating.

  In this method, joining between the rings of adjacent segments and joining between pieces can be performed simultaneously.

  Among these, regarding the joint used between the pieces, for example, Patent Document 1 includes a male joint having a T-shape and a female joint having a slidable gradient member, and the gradient member exerts a predetermined force or more. A joint that is temporarily fixed at a predetermined position by a temporary fixing member that loses its fixing function when received is described.

  FIG. 4 shows a joint similar to that shown in Patent Document 1. In this joint structure, when an insertion force is applied, a fastening force is introduced between the joint surfaces, and the members can be coupled to each other. At this time, bonding is performed by a process as shown in FIG. The bonding process will be briefly described below. The one with the T-shaped member 3 is the male joint 1 and the one with the fitting groove (slit) 4 is the female joint 2.

  First, the T-shaped member 3 on the male joint 1 side is installed in the direction toward the fitting groove 4 of the female joint 2 so that the joint surfaces come into contact with each other, and the insertion force is parallel to the joint surface using a hydraulic jack or the like. (See FIG. 5 (a)).

  Next, when the T-shaped member 3 passes through the fitting groove 4 (see FIG. 5 (b)) and comes into contact with the gradient member 5 (see FIG. 5 (c)), the fastening force is generated between the joints by the wedge effect due to the gradient. Is introduced.

  If the insertion force is further increased, the temporary fixing member 6 temporarily fixing the gradient member 5 will be destroyed, and the gradient member 5 will be slidable. (See FIG. 5 (d)).

  At this time, it is possible to control the insertion force and the fastening force by adjusting the shear strength of the temporary fixing member 5.

  Further, in Patent Document 2, when a generally T-shaped flange portion and a web portion provided in a male joint are inserted into a female joint, the taper comes into contact with the flange of the male joint, and the contact force increases as the insertion proceeds. A joint comprising a holding member is provided which is provided with a member having a surface and is deformed to cause sliding of the tapered member when the contact force increases beyond a predetermined value. Furthermore, examples of the holding member include a shear key, a shear pin, a tension pin, and a buckling material.

  On the other hand, for the inter-ring joint, as described in Patent Document 3, for example, a rod-shaped male joint protruding from one joint surface is fitted into a female joint that forms an insertion hole in the other joint surface, and a female Various types have been developed that are fixed by a wedge member or the like provided in the joint.

As an example of the one-pass fitting described above, for example, the joint shown in Patent Document 3 is used for a joint between rings, and the joint shown in Patent Document 1 or Patent Document 2 is used for a joint between segment pieces. It is a combination of fittings that can be fitted with one pass.
Japanese Patent Laid-Open No. 2002-357095 JP 2001-248391 A JP 2001-173625 A

  In a shield tunnel, as shown in FIG. 6, when a segment piece (hereinafter referred to as “K segment”) having a gradient is fitted to a joint surface to be inserted last when a ring is formed, the influence of the gradient or Due to the effect of joining the adjacent segment pieces (hereinafter referred to as “B segment”) at the same time, there may be a problem that the fastening force is not sufficiently introduced or the jack thrust becomes larger than expected. .

  For example, if the B segment interval is set wider than a predetermined value due to construction errors, etc., when fitting proceeds from the state shown in FIG. 7 (a), as shown in FIG. Although the member 3 and the gradient member 5 of the female joint 2 are in contact with each other, a gap g1 is generated between the joint surfaces, and the members are not in contact with each other.

  At this time, since the B segment is almost fixed by other existing segment pieces, even if the B segment is pulled by the wedge effect, the temporary fixing member 6 may be broken before the joint surfaces come into contact with each other.

  In such a case, when the K segment is further pushed after the temporary fixing member 6 is broken, a gap g2 is generated on the sliding surface 7 between the female joint 2 and the gradient member 5, as shown in FIG. The joint becomes unstable.

  Next, in order to prevent the gradient member 5 from becoming unstable, consider a structure in which the direction of the insertion load and the direction in which the gradient member 5 slides are parallel. In Patent Document 2, when the joint surface is inclined with respect to the insertion direction of the segment, in order to make the sliding surface coincide with the insertion direction, other portions except the contact portion of the jaw portion of the female joint are tapered. It has a shape.

  As a structure similar to this, it is assumed that the inside of the female joint 2 is shaped in advance so as to eliminate the gradient of the sliding surface 7 as shown in FIG. At this time, if the insertion is continued as it is after the temporary fastening member 6 is broken, the gradient member 5 will not become unstable, but eventually the joint surfaces come into contact with each other as shown in FIG. The member 5 bites into the T-shaped member 3 and cannot be inserted to a predetermined position, or a considerably large insertion force is required to forcefully spread the T-shaped member 3. Note that the structure of FIG. 8 is not practical in terms of manufacturing cost.

  The present invention is intended to solve the above-described problems, and it is difficult to obtain a stable joint portion with the conventional structure because of the relationship between the shape and the use position, as in the case of the K-segment fitting of the shield tunnel. An object of the present invention is to provide a joint between members excellent in workability and stability that can be easily joined without requiring an excessive insertion force.

  The inter-member joint of the present invention includes a female joint having a fitting groove formed on a joint surface of one member to be joined to each other, and a groove of the fitting groove of the female joint protruding from the joint surface of the other member. A male joint that is fitted along a continuous direction, and the male joint is formed with a gradient portion having a gradient in a direction in which the joint surfaces are drawn together by fitting into the fitting groove of the female joint. In addition, a gradient member that has a gradient corresponding to the gradient portion of the male joint and is in contact with the gradient portion of the male joint is fixed at a predetermined position in the fitting groove of the female joint by receiving a force exceeding a predetermined value. In the joint between members which is temporarily fixed by the temporary fixing means losing the function and is slidable in the groove continuous direction by losing the fixing function, the gradient member comes into contact with the female joint and A first gradient member forming one sliding surface; and the first And a second gradient member that forms a second sliding surface in contact with the distribution member, and the first gradient member is fixed to a predetermined position in the fitting groove of the female joint by receiving a predetermined force or more. Temporarily fixed by the first temporary fixing means that loses function, and by losing the fixing function, the first sliding surface can slide in the groove continuous direction of the fitting groove, and the second gradient member is The first gradient member is temporarily fixed by the second temporary fixing means that loses the fixing function by receiving a force of a predetermined level or more, and can be slid on the second sliding surface by losing the fixing function, The second gradient member is in contact with the gradient portion of the male joint, and a gradient corresponding to the gradient portion of the male joint is formed by the first gradient member and the second gradient member.

  As described above, by arranging the gradient member and the temporary fixing member in two stages, the gradient member exhibits an unstable behavior or the construction problem such that the gradient member bites and the insertion load becomes considerably large is solved. It becomes possible.

  The female joint, the first gradient member, and the first gradient member and the second gradient member are fixed by the first and second temporary fixing means, respectively, in the state where no load is applied, and there is no relative slip. When force is applied to the first gradient member from the second gradient member and further from the second gradient member, slippage occurs gradually on these sliding surfaces, and the temporary fixing means loses its fixing function upon receiving a force exceeding a predetermined value. .

  As the first and second temporary fixing means, the one managed by the shear load of the bolt like the temporary fixing bolt in Patent Document 1, the shear pin, the shear key, the pulling pin, the buckling material, etc. in Patent Document 2 In addition, various temporary fixing means that lose the fixing function by receiving a force of a predetermined level or more during insertion fitting of the male joint can be used.

  According to a second aspect of the present invention, in the inter-member joint according to the first aspect, the force at which the second temporary fixing member loses the fixing function is set smaller than the force at which the first temporary fixing member loses the fixing function. It is characterized by.

  According to a third aspect of the present invention, in the inter-member joint according to the first or second aspect, the angle formed between the direction of the external force applied to join the members and the joint surface of the members is an acute angle, and the angle is the first angle. It is characterized by substantially matching the gradient of the gradient member.

  By having the features of the second and third aspects, the order in which the first and second temporary fixing members are broken can be substantially specified, and the design is facilitated.

  In addition, by applying a treatment for reducing the frictional resistance to the sliding surfaces of these gradient members, the insertion force can be further suppressed and the segment pieces can be stably fitted.

  The treatment for reducing the frictional resistance against the sliding surface between the female joint and the first gradient member or between the first gradient member and the second gradient member includes coating of the sliding surface in addition to coating by resin processing such as fluororesin. It is conceivable to increase the smoothness or, on the contrary, apply a surface treatment such as providing fine irregularities on the surface to reduce the contact area, or applying a friction reducing material to the sliding surface.

  According to the inter-member joint of the present invention, when the male joint formed on the joint surface of the members to be joined to each other is fitted to the female joint, the male joint is easily and surely fitted to a predetermined position. Thus, a predetermined fastening force can be secured and joining can be performed.

  At that time, it is necessary to slide the member using a jack or the like, but the jack thrust can be reduced.

  Therefore, by adopting the joint structure of the present invention in the construction work, the work at the site can be made more efficient and the construction speed can be increased, which contributes to the reduction of construction costs.

  In particular, when the joint structure of the present invention is used in the case of K-segment fitting of a shield tunnel, even if the interval between the B segments is slightly widened or narrowed due to construction errors, the gradient member falls off or bites. The segment piece can be stably fitted without causing an excessive insertion force.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. The illustrated embodiment is a case where the joint between members of the present invention is applied to the K segment fitting of the shield tunnel described in FIG. 6, and in that case, when the construction is performed up to the B segment, the interval between the B segments is a construction error. Depending on the situation, it can be considered when it is wider or narrower than a predetermined position.

  Therefore, in each case, the behavior of the structure of the present invention will be described below.

  FIG. 1 shows a process in the case where the installation of the B segment is wider than a predetermined position.

  In this case, from the state of FIG. 1A, it is considered that the T-shaped member 3 of the male joint 1 and the second gradient member 5 come into contact before the joint surface comes into contact, as shown in FIG. 1B. At this time, since the B segment is substantially fixed, the B segment is slightly pulled by the first and second gradient members 5a and 5b, but is not pulled until the joint surface comes into contact.

  In FIG. 1C, first, the second temporary fastening member 6b is broken and slides on the second sliding surface 7b where the first and second gradient members 5a and 5b are in contact with each other. Then, when the K segment is pushed in as it is, the joint surfaces come into contact with each other.

  At this time, in terms of the relative relationship between the joint surfaces, the gradient members are in two stages with the first and second gradient members 5a and 5b, and the compressive force from the external force acts on the joint surfaces. Is almost the same as a conventional joint, and is joined along the joint surface.

  Accordingly, finally, as shown in FIG. 1 (d), the first temporary fixing member 6a is broken, and the fitting is completed when the K segment is inserted to a predetermined position.

  Next, FIG. 2 shows a process when the installation of the B segment is narrower than a predetermined position.

  In this case, from the state of FIG. 2 (a), as shown in FIG. 2 (b), the joint surface comes into contact before the T-shaped member 3 of the male joint 1 and the second gradient member 5b come into contact with each other. As K is expanded, the K segment is inserted. When pushed further from this state, the T-shaped member 3 and the second gradient member 5b come into contact as shown in FIG.

  Then, although the compressive force is contained in the joint surface, it can be seen that the segment pieces are in a state similar to that of the conventional joint when the segment pieces are viewed relatively. That is, the first and second gradient members 5a and 5b having two stages function as one gradient member, and the first temporary fastening member 6a is broken as shown in FIG. The mating is completed by inserting it to the position.

  As described above, when this joint is used, even if the interval between the B segments is slightly widened or narrowed due to a construction error, there is no problem that the gradient member falls off or gets caught.

  In this case, specifically, as shown in FIG. 3, by disposing the male joint 1 and the female joint 2 vertically on each joint surface, only by inserting the K segment in the tunnel axis direction, 4 The joints at the locations are joined simultaneously.

  The insertion force is further suppressed by reducing the frictional resistance of the sliding surface, such as by applying a coating material on the sliding surfaces of the first and second gradient members 5a, 5b, or any of them. Stable segment piece fitting can be performed.

It is explanatory drawing of a joining process in case the space | interval of B segment is wide in the coupling of this invention. It is explanatory drawing of a joining process in case the space | interval of B segment is narrow in the coupling of this invention. It is explanatory drawing which shows the example at the time of applying this joint structure to the joint of a BK segment. It is a perspective view which shows the example of the conventional joint between segment pieces. It is explanatory drawing of the joining process of the conventional joint between segment pieces. It is a perspective view which shows the relationship between K segment and B segment. It is explanatory drawing at the time of using the conventional coupling for the coupling of a BK segment. It is explanatory drawing at the time of eliminating a gradient in the joint surface of a BK segment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Male joint, 2 ... Female joint, 3 ... T-shaped member, 4 ... Fitting groove (slit), 5 ... Gradient member, 5a ... 1st gradient member, 5b ... 2nd gradient member, 6 ... Temporary fastening member, 6a ... first temporary fixing member, 6b ... second temporary fixing member, 7 ... sliding surface, 7a ... first sliding surface, 7b ... second sliding surface

Claims (3)

  A female joint having a fitting groove formed on the joint surface of one member to be joined to each other, and a fitting joint projecting from the joint surface of the other member and fitted along the groove continuous direction of the fitting groove of the female joint. The male joint is formed with a gradient portion having a gradient in a direction in which the joint surfaces are drawn together by fitting into the fitting groove of the female joint. At a predetermined position in the groove, a gradient member having a gradient corresponding to the gradient portion of the male joint and contacting the gradient portion of the male joint is temporarily attached by temporary fixing means that loses the fixing function by receiving a force exceeding a predetermined value. In the member-to-member joint that is fixed and is slidable in the groove continuous direction by losing the fixing function, the gradient member abuts on the female joint to form a first sliding surface. A first gradient member and a second gradient member in contact with the first gradient member; And a first gradient member that forms a moving surface, and the first gradient member loses the fixing function when the first gradient member receives a force exceeding a predetermined value at a predetermined position in the fitting groove of the female joint. By temporarily fixing and losing the fixing function, the first sliding surface can slide in the groove continuation direction of the fitting groove, and the second gradient member is more than a predetermined amount on the first gradient member. It is temporarily fixed by the second temporary fixing means that loses the fixing function by receiving the force, and is slidable on the second sliding surface by losing the fixing function, and the second gradient member is connected to the male joint. A member-to-member joint, wherein a slope corresponding to the slope part of the male joint is formed by the first slope member and the second slope member in contact with the slope part.   2. The inter-member joint according to claim 1, wherein the first temporary fixing member is set so that the force at which the second temporary fixing member loses the fixing function is smaller than the force at which the second temporary fixing member loses the fixing function. The direction of the external force applied to join the members and the angle formed by the joint surfaces of the members is an acute angle, and the angle substantially coincides with the gradient of the first gradient member. The joint between members as described.

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