JP2007056554A - Joint between members - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint between members preventing jack thrust in an insertion time from becoming excessive, having excellent work efficiency and positively fittable without dispersion. <P>SOLUTION: The joint is composed of a female joint 2 having a fitting groove 4, and a male joint 1 fitted along the groove continuous direction of the fitting groove 4. The male joint 1 is provided with a gradient part for drawing joint faces to each other by fitting the male joint 2 into the fitting groove 4. A gradient member 5 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 5 is temporarily fixed to the female joint 2 by a temporary fastening member 6 losing a fixing function upon receiving the force of a predetermined value or more. Treatment for reducing frictional resistance such as fluororesin coating is applied to the sliding surfaces of the male joint 2 and gradient member 5. <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. 5 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. 6 (a)).

  Next, when the T-shaped member 3 passes through the fitting groove 4 (see FIG. 6 (b)) and comes into contact with the gradient member 5 (see FIG. 6 (c)), a fastening force is generated between the joints due to 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. 6 (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 substantially 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.
Japanese Patent Laid-Open No. 2002-357095 JP 2001-248391 A

  In the joint structure shown in FIGS. 5 and 6, the fastening force of the joint plate increases as the T-shaped member 3 is inserted in the tunnel axial direction. Along with this, the frictional resistance generated on the sliding surface of the gradient member 5 gradually increases, but if this frictional resistance increases, the gradient member 5 does not slide in the tunnel axis direction even if the jack thrust is increased. Is also possible.

  This means that it is impossible to install the segment piece at a predetermined position in the execution work, and not only a gap is provided between the rings, but also the fitting of the joint is incomplete, so that the joint is expected. The predetermined strength cannot be secured, and the performance originally expected as a structure cannot be exhibited.

  In addition, one of the causes is conventionally designed and managed based on the load at which the temporary fixing member or the shearing key breaks, but actually there is a variation in the frictional resistance on the sliding surface. In particular, when the frictional resistance increases, it may not be possible to cope with the assumed error range.

  The present invention has been made to solve the above-described problems, and by reducing the frictional resistance of the sliding surface of the gradient member provided in the female joint, the jack thrust during insertion is prevented from becoming excessive. An object of the present invention is to provide an inter-member joint that is excellent in workability and can be reliably fitted without variation.

  The member-to-member joint device 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 projection of the fitting groove of the female joint protruding from the joint surface of the other member. A male joint that is fitted along the groove 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. And 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 at a predetermined position in the fitting groove of the female joint receives a force greater than a predetermined value. In the inter-member joint device that is temporarily fixed by temporary fixing means that loses the fixing function and is slidable in the groove continuous direction by losing the fixing function, the sliding between the female joint and the gradient member is performed. The moving surface is treated to reduce frictional resistance. And it is characterized in that is.

  The female joint and the gradient member are fixed by temporary fixing means in a state where no load is applied, and there is no relative slip. However, when force is applied from the male joint to the gradient member, the sliding surface between the female joint and the gradient member gradually increases. Thus, the temporary fastening means loses its fixing function upon receiving a force exceeding a predetermined level.

  As the temporary fastening means, the one managed by the shear load of the bolt such as the temporary fastening bolt in Patent Document 1 and the male joint such as the shear pin, the shear key, the pulling pin, and the buckling material in Patent Document 2 are used. Various temporary fixing means that lose the fixing function by receiving a force of a predetermined level or more during insertion fitting can be used.

  The idea that such a temporary fastening means loses the fixing function by receiving a force exceeding a predetermined value, the gradient member slides, and the fastening force is made constant is the same as the conventional one. Because the effect of frictional resistance on the sliding surface between the sliding surface and the gradient member is not taken into account, the male joint can be moved to the specified position due to variations in frictional resistance on the sliding surface in addition to manufacturing errors and construction errors of the members and joints. If it could not be inserted or forcedly pushed, not only the workability was impaired, but there was a risk of deformation or damage to the members and joints to be joined.

  On the other hand, in the present invention, by reducing the frictional resistance of the sliding surface between the female joint and the gradient member, the male joint can be inserted smoothly, and in the state where the frictional resistance is reduced, the effect of the variation is also affected. There is almost nothing, and since the resistance after the temporary fixing means loses the fixing function is small, it is possible to perform reliable fitting and obtain a stable fastening force.

  The treatment for reducing the frictional resistance against the sliding surface of the female joint and the gradient member is not limited to the case of applying both to the sliding surface of the female joint and the gradient member, but only to the sliding surface on one side. This includes cases where it is applied.

  The treatment to reduce the frictional resistance against the sliding surface between the female joint and the gradient member includes coating by fluororesin or other resin processing, increasing the smoothness of the sliding surface, or conversely fine irregularities on the surface. It is conceivable to perform surface processing such as reducing the contact area by applying a friction reducing material on the sliding surface.

  The second aspect limits the case of coating by resin processing which is relatively easy to process and has a large effect.

  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.

  FIG. 1 shows a case where the present invention is applied to a segment piece of a shield tunnel as an embodiment of an inter-member joint of the present invention. One male joint 1 and one female joint 2 are provided on one joint surface of each segment piece. It is attached.

  As shown in FIG. 1 (a), each joint is installed at the end of the segment piece in consideration of the workability in the work, and in this embodiment, the male joint is connected to the joint plate of the female joint 2. A fitting groove (slit) 4 to the extent that one T-shaped member 3 can be inserted is formed. In addition, a gradient member 5 is temporarily fixed inside the inner housing by a temporary fixing member 6 that breaks when receiving a predetermined force (see FIG. 1B).

  This basic configuration is the same as in the case of FIG. 5, but in this embodiment, the contact surface of the female member 2 (see FIG. 1 (c)) and the gradient member 5 (see FIG. 1 (d)) which are sliding surfaces. One or both of them are provided with a coating 7a (female joint side) and a coating 7b (gradient member side) by fluororesin processing to reduce the frictional resistance on the sliding surface.

  A fitting experiment was performed on the above embodiment, and the effect was confirmed. The sliding surface conditions were set as shown in Table 1.

表１において、黒皮とは摩擦低減の処理を行わない場合、コーティングとは当該部材の摺動面にフッ素樹脂のコーティングを行った場合である。

In Table 1, the black skin is when the friction reduction treatment is not performed, and the coating is the case where the sliding surface of the member is coated with a fluororesin.

  Each experimental result is shown in FIGS. The vertical axis represents the segment insertion load, and the horizontal axis represents the insertion displacement. The insertion displacement δ indicates that when δ = 0 mm, the insertion is completed, that is, the segment is installed at a predetermined position.

  First, the result of case 1 is shown in FIG. The insertion load rises as the segment piece is inserted, and temporarily decreases immediately after the temporary fastening member is broken. However, since the segment piece does not slide smoothly after that, the insertion load rises rapidly and the fitting ends ( Even if the insertion load was increased up to (δ = 0 mm), no displacement occurred.

  Moreover, since the value of each measurement position (δ1-δ3) varies, it can be seen that the segment piece is deformed by the insertion load.

  On the other hand, as shown in FIG. 3, the experimental result of case 2 shows that the insertion load gradually increases immediately after the start of the insertion of the segment piece, and a temporary peak occurs when the temporary fixing member breaks. After that, even if the segment piece was continuously inserted, it smoothly slid without exceeding the load when the temporary fixing member was broken, and the fitting was finished (δ = 0 mm).

  As shown in FIG. 4, the case 3 also has a peak insertion load when the temporary fastening member breaks, as in case 2, but after that, it slides smoothly without exceeding the peak value, and the fitting is completed (δ = 0 mm).

  Further, the insertion load of the case 3 is smaller than that of the case 2, which is considered to be because the frictional resistance of the sliding portion is reduced.

  From the above results, it is assumed that when the sliding surfaces of the joint plate and the gradient member are both black, the frictional resistance increases, so it may be assumed that the segment piece cannot be fitted at a predetermined position. It was found that by applying a coating for reducing frictional resistance on the moving surface, it is possible to reliably install the segment piece at a predetermined position without excessive jacking force.

The best embodiment of the member-to-member joint of the present invention is shown, (a) is a diagram showing how the members of the present invention are joined together, (b) is a diagram showing the relationship between the female joint and the gradient member (C) is a figure which shows the friction reduction process to the female joint side of a sliding surface, (d) is a figure which shows the friction reduction process to the gradient member side of a sliding surface. 6 is a graph showing a fitting experiment result of case 1. 6 is a graph showing a fitting experiment result of case 2. 10 is a graph showing a fitting experiment result of case 3. 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.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Male joint, 2 ... Female joint, 3 ... T-shaped member, 4 ... Fitting groove (slit), 5 ... Gradient member, 6 ... Temporary fastening member, 7 ... Sliding surface, 7a ... Coating (female joint side) 7b ... coating (gradient member side), 8 ... anchor muscle

Claims (2)

  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. To reduce frictional resistance on the sliding surface between the female joint and the gradient member in a member-to-member joint device that is fixed and can slide in the groove continuous direction of the fitting groove by losing the fixing function. A part characterized by Between coupling device.   2. The member-to-member joint according to claim 1, wherein the treatment for reducing the frictional resistance is coating by resin processing on the sliding surface.

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