JP2009138390A - Joint and its fastening method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop a joint between segments, higher in rigidity than a conventional joint, so as to develop a segment for a tunnel, which requires only a small used amount of steel and which can minimize total costs in the construction of the tunnel. <P>SOLUTION: A screw reinforcement 19 of the segment 2b is exposed in a fastening box 17 from concrete 35. A coupler 12 of the segment 2a adjacent to the screw reinforcement 19, and a screw reinforcement insert 11 are integrated together by means of a coupler 29 and both screws 31. Thus, stress acting between the segments is transferred to the concrete 35, and inside and outside skin plates 3 and 5 through the screw reinforcement insert 11 and the screw reinforcement 19, so as to provide the joint higher in rigidity than the conventional joint using a bolt alone. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a joint that can be used for a segment for a shield tunnel or the like.

  Conventionally, joints between segments and between rings have been fastened with bolts and nuts across a joint plate (see, for example, FIG. 5 of Patent Document 1). When a tensile force acts on the bolt due to the stress acting between the segments, the tensile force acts as a bending force or a shearing force on the joint plate, and is finally applied to the skin plate through the bolt box. At that time, a large force is applied to the welded portion between the joint plate and the bolt box and between the bolt box and the skin plate.

JP 2004-204545 A

  However, in the conventional joint, (1) the thickness of the skin plate is determined by the welded portion between the bolt box and the skin plate, which is uneconomical. (2) The thickness of the joint steel plate is increased by the bolt specifications. (3) It is important to ensure the welding quality between the joint steel plate, the bolt box, and the skin plate, and there are problems such as an increase in manufacturing cost as well as ensuring the overall accuracy. Further, since the side plate needs to be bent in a state where the seal groove is installed, there is a problem that the plate thickness increases as the girder height increases.

  The present invention has been made in view of the above-described problems, and its purpose is to reduce the thickness of skin plates and joint plates, and to provide a joint with high rigidity that can be used for low-cost segments. It is to provide.

  In order to achieve the above-mentioned object, a first invention is a joint that connects between a first screw and a second screw, and the second screw is a double screw having screws at both ends. The joint is characterized in that it is screwed into one screw, and the other of the two screws is fastened to the first screw by a coupler. The first screw and the second screw may be fixed to different segments, the first screw is a reinforcing bar having a male screw, and the second screw is provided inside the reinforcing bar. It may be a female screw.

  A second invention is a fastening method for joining between a first screw and a second screw, the step of screwing one of the two screws into the second screw, and the other of the two screws. And fastening the first screw and the first screw with a coupler. The first screw and the second screw may be provided in different segments, respectively, the first screw is a reinforcing bar having a male screw, and the second screw is provided inside the reinforcing bar. It may be a female screw.

  According to the joint of the present invention, since the segments can be fastened with high rigidity, members such as a skin plate and a joint plate do not become thicker than necessary with respect to the plate thickness required for the structure. As a result, the amount of steel used can be reduced.

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

  FIG. 1 is a perspective view of a joint 1 for a six-sided steel shell according to the present embodiment. Segment 2a and segment 2b are segments having the same structure, and the other end of segment 2a (not depicted in FIG. 1) has the same structure as segment 2b depicted in FIG. The other end of has the same structure as the segment 2a.

  The segment 2a has an outer skin plate 5, and two side plates 7 perpendicular to the outer skin plate 5 are provided facing each other. Further, joint steel plates 14 and 23 perpendicular to the two side plates 7 are provided substantially perpendicular to the outer skin plate 5. The inner skin plate 3 is provided so as to be substantially perpendicular to the side plate 7 and the joint steel plates 14 and 23 so as to face the outer skin plate 5. The segment 2 a forms a box shape by the inner skin plate 3 and the outer skin plate 5, the pair of side plates 7, and the joint steel plates 14 and 23.

  As will be described later, the joint steel plates 14 are provided above and below the side surface of the segment 2 a, and joint surface concrete 13 as shown in FIG. 2A is exposed between the joint steel plates 14. A seal groove 9 is provided on the outer peripheral side of the segment 2 a of the side plate 7 and the joint steel plates 14 and 23. Further, the segment 2 a is filled with concrete, and the joint surface concrete 13 is exposed from the gap between the joint steel plates 14. A threaded rebar insert 11 and a coupler 12 screwed to the thread rebar insert 11 are provided near the center of the joint surface of the segment 2a, and a bolt insert 15 is embedded in the concrete along the major axis direction of the segment 2a. ing. The coupler 12 and the bolt insert 15 are exposed on the joint surface concrete 13. The structure of the joint steel plate 14 and the joint face concrete 13 is shown in detail in FIG.

  Further, the joint portion of the segment 2 b has a rectangular parallelepiped type fastening box 17 opened to the joint face concrete 25 and the inner skin plate 3. A screw rebar 19 embedded in the concrete protrudes in the fastening box 17 along the long axis direction of the segment 2b. The joint surface concrete 25 is exposed from the gap between the joint steel plates 23 of the segment 2b, and the bolt holes 21 are provided at the ends of the joint steel plates 23. The structure of the joint steel plate 23 and the joint concrete 25 is shown in detail in FIG.

  2A is a view of the segment 2a in the direction of the arrow A in FIG. 1, FIG. 2B is a cross-sectional view taken along the line aa in FIG. 2A, and FIG. FIG. 2D is a cross-sectional view taken along the line bb of FIG. 2A. The joint steel plate 14 has a seal groove 9, and the joint surface concrete 13 is exposed between the joint steel plate 14 and the joint steel plate 14. In the joint surface concrete 13, the coupler 12 is exposed at the end, and the bolt insert 15 is exposed at a place other than the end. The cross beam 27 supports the segment 2a so as not to be deformed by stress. As shown in FIG. 2B, the bolt insert 15 has a female screw 16 inside. The inner skin plate 3 and the outer skin plate 5 have a dowel 37 and are integrated with the concrete 35. As shown in FIG. 2C, the segment 2a is provided with a thread rebar insert 11 screwed to the coupler 12, and the coupler 12 is exposed on the surface of the segment 2a. As shown in FIG. 2 (d), a cross beam 27 is provided so as to connect between the inner skin plate 3 and the outer skin plate 5.

  The cross beam 27 is preferably a perforated steel plate.

  3 (a) is a view of the segment 2b as viewed in the direction of the arrow B in FIG. 1, FIG. 3 (b) is a sectional view taken along the line dd of FIG. 3 (a), and FIG. 3 (c) is FIG. FIG. 3D is a sectional view taken along line ff in FIG. 3A, and FIG. 3E is a sectional view taken along line gg in FIG. 3A. A fastening box 17 is provided in the segment 2b, and a fastening operation can be performed in the fastening box 17. In the fastening box 17, a screw rebar 19 protruding from the concrete 35 inside is provided. Bolt holes 21 are provided in the joint steel plate 23. As shown in FIGS. 3B and 3C, the bolt hole 21 and the screw rebar 19 can be accessed from the fastening box 17. As shown in FIG. 3 (d), the inner skin plate 3 and the outer skin plate 5 are connected by a cross beam 27. As shown in FIG. 3E, the segment 2b is filled with concrete 35.

Next, a procedure for fastening the segment 2a and the segment 2b using the joint 1 will be described.
4A is a diagram showing a state in which the joint surface of the segment 2a shown in FIG. 2B and the joint surface of the segment 2b shown in FIG. 3B are in contact with each other, and FIG. These are figures which show the state which temporarily fastened the segment 2a and the segment 2b. As shown in FIG. 4A, the joint surface of the segment 2b is aligned with the joint surface of the segment 2a, and the bolt 33 is screwed to the bolt insert 15 as shown in FIG. As shown in FIG. 5, the displacement between the segments during fastening of the joint 1 is prevented. In this way, the segments 2a and 2b are temporarily fastened.

Next, the segments are fastened by the joint 1. The details are as follows.
5 (a), 5 (b), and 5 (d), the joint surface of the segment 2a shown in FIG. 2 (c) is in contact with the joint surface of the segment 2b shown in FIG. 3 (c). FIG. 3 is an explanatory diagram for fastening a segment 2a and a segment 2b by a joint 1. FIG. 5C shows the structure of both screws 31.

  As shown in FIG. 5A, the coupler 29 and the screw rebar 19 are screwed together so that the coupler 29 moves in the C direction. As shown in FIG. 5B, both the screw 31 and the coupler 12 are screwed so that the coupler 12 moves in the D direction, and further, the coupler 29 and the both screws so that the coupler 29 moves in the E direction. 31 and Rao.

  As shown in FIG. 5C, both screws 31 have a fixing-side male screw 43 and a fastening box-side male screw 41 protruding in the opposite direction from both screw heads 39. The fixing-side male screw 43 and the fastening box-side male screw 41 are opposite to each other. When the screw heads 39 are rotated, the fixing-side male screw 43 and the fastening-box-side male screw 41 are screwed together. An object approaches or moves away. As shown in FIG. 5D, by tightening both screws 31, the coupler 12 and the coupler 29 are attracted and the segments are fastened. When the fastening operation is further advanced, it becomes as shown in FIG.

  FIG. 6 a is a view showing a state of a joint in which both screw rebars 19 are fastened. FIG. 6b is a plan view of the joint that has been fastened.

  Note that the fastening box 17 may be filled with mortar or the like after the fastening is completed.

  In the present embodiment, the joint 1 is used for fastening between segments, but the joint 1 may be used for fastening between rings.

  According to the present embodiment, when a stress acts between the segments, the force is transmitted to the concrete 35, the inner skin plate 3, and the outer skin plate 5 through both the screws 31, the coupler 29, and the screw rebar 19. In a structure in which a bolt is simply attached to a joint plate as in a normal joint, force is applied in the route of the bolt-joint plate-skin plate, and welding strength is required. However, in the joint 1 according to the present embodiment, The force is applied to the entire segment, increasing the rigidity.

  As a result, it is not necessary to increase the thickness of the members such as the skin plates 3 and 5 of the segment 2 and the joint steel plates 14 and 23 for the reason of segment manufacture, and a member having the same thickness as the structural necessary thickness is used. This makes it possible to reduce the amount of steel used, and in turn reduce the segment production cost.

  As mentioned above, although preferred embodiment of the coupling concerning this invention was described referring an accompanying drawing, this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

The perspective view of the coupling of the present invention before fastening. (A) Front view of the fixing side joint surface of the segment, (b) aa sectional view in FIG. 2 (a), (c) same bb sectional view, (d) same cc sectional view (A) Front view of the fastening box side joint surface of the segment, (b) aa sectional view in FIG. 3 (a), (c) same bb sectional view, (d) same cc sectional view, ( e) dd sectional view (A)-(b) The figure which shows the fastening process of the volt | bolt of this Embodiment. (A)-(d) The figure which shows the fastening process of the coupling of this Embodiment. Front view of the joint of the present invention after fastening The top view of the coupling of the present invention after fastening.

Explanation of symbols

1 ……… Joint 2 ……… Segment 3 ……… Inner skin plate 5 ……… Outer skin plate 7 ……… Side plate 9 ……… Seal groove 11 ……… Screw rebar insert 12 ……… Coupler 13 …… ... Fitting concrete 14 ......... Fitting steel plate 15 ......... Bolt insert 16 ......... Female thread 17 ......... Fastening box 19 ......... Screw rebar 21 ......... Bolt hole 23 ......... Fitting steel plate 25 ... ... Concrete concrete 27 ... …… Later 29 ... …… Coupler 31 ... …… Both screws 33 ……… Bolt 35 ……… Concrete 37 ……… Givel 39 ……… Both screw heads 41 ……… Screw box side Male screw 43 ……… Fixing side male screw

Claims (6)

A joint connecting between the first screw and the second screw,
The joint, wherein the second screw is screwed into one of both screws having screws at both ends, and the other screw of the both screws is fastened with the first screw by a coupler.   The joint according to claim 1, wherein the first screw and the second screw are respectively fixed to different segments.   The joint according to claim 1, wherein the first screw is a reinforcing bar having a male screw, and the second screw is a female screw provided inside the reinforcing bar. A fastening method for connecting between a first screw and a second screw,
Screwing one of the two screws into the second screw;
Fastening the other screw of the two screws and the first screw with a coupler;
The fastening method characterized by comprising.   The fastening method according to claim 4, wherein the first screw and the second screw are provided in different segments. The fastening method according to claim 4, wherein the first screw is a reinforcing bar having a male screw, and the second screw is a female screw provided inside the reinforcing bar.

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