JP4332091B2 - Steel or synthetic segment connection structure reinforcement - Google Patents

Description

  The present invention relates to a steel or synthetic segment structure used as a lining body in a shield tunnel, and particularly to a reinforcing structure of a connecting portion when connecting segments.

  In steel segments and composite segments of shield tunnels, connecting members (for example, bolts and nuts) are connected between joint plates adjacent in the tunnel circumferential direction (between segment joints) or between main girders adjacent in the tunnel axial direction (between ring joints). In addition, when the segments are connected to each other by a wedge-shaped member), if a tensile or bending load acts between the joint plates or between the main girders (generally referred to as joints), the tensile load is concentrated on the connecting member. For this reason, the joint plate or the main girder that fixes the connecting member may be deformed out of plane, and the yield strength of the joint portion may be reduced. In particular, when a lever reaction force is generated, an excessive tensile load acts on the connecting member at a specific position, and there is a problem that the entire connecting member does not even resist the load evenly.

Thus, various structures have been proposed so far as methods for suppressing out-of-plane deformation of the joint plate and main girder. For example, as a structure in which a plurality of ribs are attached to the back of a joint plate to reinforce the joint plate and the main girder, Patent Document 1 discloses a method of fixing a plurality of reinforcing plates to the inner surface of the joint plate immediately behind the bolt joint. Also disclosed in Patent Document 2 is a structure in which a joint plate having a plurality of horizontal ribs continuous in parallel to the joint plate and a plurality of vertical ribs continuous in a direction perpendicular to the tunnel axis is formed by casting. Yes. According to these methods, since a plurality of ribs are attached to the back of the joint plate, there is an effect that the bending rigidity is extremely increased. Moreover, as a method of increasing the strength of the joint plate, a method of increasing the plate thickness in a pseudo manner by overlaying a reinforcing plate on the inner side of the main girder plate and the joint plate, and Patent Document 3 includes a method of using H-shaped steel. Has been proposed .

  Moreover, as a method of reinforcing the joint plate, Patent Document 4 discloses that an L-shaped or T-shaped shape is formed at a position where the joint plate at the end of the main girder contacts the joint plate for the purpose of strengthening the vicinity where the main girder and the joint plate are connected. There are known methods for attaching these members, and a method for attaching a thick plate-like end plate having high rigidity has also been proposed.

In addition, as an example of a method for reinforcing the segment joint position, an end reinforcement made of fiber-reinforced concrete has been proposed for the RC segment.

JP 2000-204893 A JP 2000-154697 A Japanese Patent Laid-Open No. 10-339099 JP 2001-3697 A

  In the above-described conventional technology, when only the bolt or wedge-shaped member or the vicinity of the joint between the joints is welded and attached with the reinforcing material, the attachment location on the joint plate or the main girder is locally deformed by welding. Therefore, it becomes difficult to ensure the flatness of the end face of the joint plate or main girder, and when it is in service (when it is used after being actually assembled), when the segment is incorporated as a tunnel lining body When a tensile or bending load is applied to the joint, an excessively large load acts locally around the bolt or wedge-shaped member, causing the joint plate or main girder to be deformed unevenly, creating gaps between the joints, and worsening the water stoppage. There was a problem that occurred.

  Further, when integrally molding by casting, since there are many complicated rib shapes, the mold shape tends to be complicated and the casting cost tends to increase. In addition, when the joint plate manufactured by casting and the main girder are connected by welding, there are problems such as formation of cavities inside the weld, which tends to cause welding defects, and further expected elongation performance of the cast product. There was a possibility that it could not be done, especially when it became a problem in earthquake resistance on soft ground, etc.

  When connecting the joint between segments with H-section steel, it is necessary to shift the bolt fastening position from the center of the segment height due to the relationship with the H-section steel web. In order to cope with both internal pressure and external pressure, It was uneconomical that it was necessary to fasten the upper and lower two steps in the height direction, and labor was increased during construction.

The present invention solves the above-mentioned problems, prevents deformation of the connecting portion, prevents deterioration of the water-stopping property, does not require complicated processing, and reduces the cost. The purpose is to provide.

In order to solve the above-described problems, the present invention is configured as follows.
1st invention is the reinforcement structure of the connection part of the steel segment which consists of steel shells which have a main girder, a joint plate, and a skin plate, or a synthetic segment which fills the steel shell with filling concrete, so as to cover the whole of the connecting member for fastening across the joint plate or between the main girder together, over the longitudinal direction on the steel shell inner side of the joint plate or main girder, cross section C-shaped (U-shaped, etc. Including a reinforcing member.

  The length of a C-shaped reinforcing member (hereinafter also referred to as a C-shaped reinforcing member) is more effective in obtaining the reinforcing effect if it extends over the entire length in the longitudinal direction of the joint plate or main girder. is there. Due to the rigidity of the C-shaped reinforcing member, out-of-plane deformation of the joint plate or the main girder can be suppressed.

  According to a second invention, in the first invention, the main girders in which both ends in the longitudinal direction of the C-shaped reinforcing member are arranged on both sides of the joint plate to which the C-shaped reinforcing member is attached, or It is attached to the joint plate arrange | positioned at the both sides of the main beam to which the C-shaped reinforcement member is attached.

According to a third invention, in the first invention or the second invention, the C-shaped reinforcing member is channel steel.

  According to the reinforcing structure of the steel segment or composite segment connecting portion according to the present invention, the joint plate or the entire main girder will share the load evenly, preventing local out-of-plane deformation and flatness of the joint surface. Retained water resistance is ensured. In addition, since the out-of-plane deformation is suppressed, a high yield strength can be secured against the tensile or bending load of the joint, and the occurrence of a lever reaction force can also be prevented, so that an excessive load is applied to the bolt or wedge-shaped member. Can be prevented.

In addition, by using grooved steel as the C-shaped reinforcing member, the manufacturing cost can be greatly reduced compared to the case where the plate material is conventionally attached to the joint plate and main girder by welding in a complicated manner.
The C-shaped reinforcing member not only serves as a reinforcement to prevent deformation of the joint plate and main girder, but also by connecting the longitudinal end of the joint plate to the orthogonal main girder or joint plate. The load received from the jack can also be borne by the reinforcing member, and the yield strength of the entire segment is increased. Similarly, since the function as a resistance material by the C-shaped reinforcing member is added to the axial force in the circumferential direction of the tunnel, the circumferential resistance force can be increased.

In particular, in the composite segment, when a wedge-shaped member is used as the connecting member, the joint plate or the fastening portion to the main girder is completely covered with a C-shaped reinforcing member, so that a wedge-shaped concrete is placed when placing the filling concrete. In addition to preventing the inflow of concrete into the member, and conversely, even if water enters the inside of the wedge-shaped joint, it prevents the leakage of water into the segment body. There exists an effect which a reinforcing member can bear.

  Hereinafter, the reinforcement structure of the connection part of the steel segment or synthetic | combination segment of embodiment of this invention is demonstrated with reference to figures.

  1 and 2 show a perspective view and a cross-sectional view of an example of a reinforcing structure when a connecting portion between joint plates is reinforced. The present invention may be applied to a segment for a tunnel having a rectangular cross section, or of course to a segment having a curvature in a main beam or a joint plate for a tunnel having a circular or elliptical cross section.

  The steel or synthetic segment according to the reinforcing structure of the segment connecting portion of the present invention has a main girder 1, a joint plate 2, and a skin plate 3, and a connecting member that connects between the joint plates 2 or between the main girders 1. A reinforcing member 5 having a C-shaped cross section is attached to the inner side of the steel plate of the joint plate 2 or the main girder 1 in the longitudinal direction so as to cover (the bolt 6, the nut 7, the wedge-shaped joint, etc.). . This mounting method is preferably welding from the viewpoint of securing the mounting strength and ease of construction. In some cases, such as cases where the location of the segment is not soft ground and there is no seismic problem, the joint plate 2 or the main girder 1 and the reinforcing member 5 having a C-shaped cross section are integrally molded by casting or the like. It doesn't matter.

When installing the segment, the segment is strongly gripped by the shield machine. Therefore, the segment has reinforcing ribs (reinforcing a plurality of segments installed between the main girders 1 and approximately parallel to the joint plate 2). It is preferable to provide a member (not shown).

  Moreover, although the figure shows the grooved steel as an example for the reinforcing member 5 having a C-shaped cross section (also referred to as a U-shape), the cross-section assembled by built-up has a C-shaped reinforcing member or a part thereof. The H-shaped steel including the C-shaped shape or the cross-section assembled by built-up may be an H-shaped reinforcing member.

  In a case where the joint plates 2 (segment joints) of adjacent segments are connected using bolts 6 and nuts 7 as connecting members, the bolts provided at predetermined intervals in the longitudinal direction on the joint plate 2 in the segment 13 on one side. A nut 7 is welded to the portion of the insertion hole 4, and a reinforcing member 5 having a C-shaped cross section is welded and attached in the longitudinal direction (direction between main girders) so as to cover the nut 7. At that time, two flanges 9 (see FIG. 3) at the upper and lower portions of the reinforcing member 5 are welded to the joint plate 2. Instead of welding the nut 7, the screw insertion hole 4 may be directly threaded with a tap to provide a female screw hole. (Not shown)

In the joint plate 2 in the segment 13 on the other side, the flange member upper and lower portions of the C-shaped reinforcing member 5 are covered with the C-shaped reinforcing member 5 so as to cover the bolt insertion hole 4 to which the bolt 6 is attached. Two locations are welded to the joint plate 2 (for example, continuous welding). A notch hole 12 for bolt fastening work is partially opened in the side of the flange 9 on one side or the web 10 at the position of the bolt insertion hole 4 by an area necessary for the bolt fastening work. In FIG. 1, the notch 12 is opened on the web 10 side (see FIG. 3) of the reinforcing member 5, but it may be opened on the flange 9 side. It is preferable that the above is manufactured and processed in advance in the factory, because on-site construction becomes easy. At the tunnel construction site, the joint plates of both segments are brought together, and the bolts are inserted from the bolt fastening holes and fastened to the nuts.

The synthetic segment and the steel segment have the same method for attaching the C-shaped reinforcing member to the joint plate, but in the case of the synthetic segment, when the notch hole 12 for bolt fastening work is provided, What is necessary is just to cover with a thin plate etc. by welding or an adhesive so that the concrete 8 may not flow into a joint part at the time of filling concrete filling.
In particular, when the water-stopping requirement is severe, the bolt fastening hole may be closed by welding the lid thereafter.

  It is more effective if the longitudinal ends of the C-shaped reinforcing member 5 are in contact with the main girder 1 orthogonal to the joint plate 2 so that the joint plate 2 evenly resists tensile or bending strength. (See FIG. 4). When the reinforcing member 5 having a C-shaped cross section is not brought into contact with the main girder, the end portion 11 (see FIG. 3) of the reinforcing member 5 having a C-shaped cross section is fixed with a thin plate or the like by welding or an adhesive or the like. Then, it is only necessary to prevent the concrete from flowing into the joint portion when the segment is manufactured (see FIG. 5 and the lid 14 indicated by a two-dot chain line).

  At this time, the method of connecting the both ends of the reinforcing member 5 having a C-shaped cross section and the main girder 1 is by welding in order to prevent the concrete 8 from flowing into the joint when the concrete 8 is placed. The gaps may be filled using a polymer such as silicon. In particular, when the reinforcing member 5 having a C-shaped cross section is expected to function as a vertical rib of the segment, it is effective to connect the main girder 1 by welding. As a reinforcing member 5 having a C-shaped cross section, it is possible to reduce the reinforcing cost of the joint portion by using grooved steel, rather than building up a plate material.

Although illustration is omitted, when the reinforcing member 5 having a C-shaped cross section is installed on both the joint plate 2 and the main girder 1, the reinforcing member having a C-shaped cross section against the load received by the jack of the shield machine. In order to use 5 as a part of the resistance member of the vertical rib, and to prevent the joint plate from being deformed and bent when the earth and water pressure is applied to the segment 13, both ends of the C-shaped member attached to the joint plate are provided. It is desirable to extend the main girder and connect the C-shaped member attached to the main girder as long as it does not interfere with the C-shaped member attached to the joint plate. However, if the shear force acting on the joint between rings is large due to the condition of the earth and water pressure acting on the segment 13, and it is important to prevent the deformation of the main girder 1, the cross-sectional shape of the section C attached to the main girder The reinforcing member 5 that extends to the joint plate 2 on both sides and is attached to the joint plate 2 has a cross-sectional C-shaped reinforcing member 5 that does not interfere with other reinforcing members 5 that are attached to the main girder 1 It is desirable to use a mounting method.

  When attaching the C-shaped reinforcing member 5 to the main girder of the segment having the vertical rib, the height of the vertical rib (tunnel dimension in the radial direction) should be lowered and the connecting member of the main girder 1 should be avoided. In addition, the vertical rib can be installed close to the skin plate side or the opposite side so that it does not interfere with the vertical rib when the C-shaped reinforcing member 5 is installed. Alternatively, after attaching the C-shaped reinforcing member 5 to the main beam 1, it is also possible to attach vertical ribs to the back surface of the reinforcing member 5 by welding. Furthermore, it is also possible to install a C-shaped reinforcing member along the main beam 1 between the individual vertical ribs fixed so as to bridge the main beam 1.

  In addition, when a wedge joint is used as the connecting member, there is no bolting work when the joint is fastened, and the fastening work from the reinforcing member side of the joint plate is not necessary, so it is necessary to provide a work notch hole in the reinforcing member There is no processing effort and workability is improved. Furthermore, since there is no opening, water-stopping is improved.

  Actually, as a result of conducting a bending test of a segment joint using a wedge-shaped joint and investigating the deformation state of the joint portion, the joint opening amount is the same as that of the wedge-shaped joint when the reinforcing member 5 having a C-shaped cross section is not reinforced. It was confirmed that it consisted of the sum of the elongation deformation and the deformation in the out-of-plane direction of the joint plate. By suppressing the out-of-plane deformation of the joint plate, it was confirmed that the amount of openings in the entire joint was reduced and water stoppage could be secured.

In addition, when a pin or bolt is fastened between the rings and shearing force is generated in the fastening part, local stress is generated in the part, causing the main girder supporting the pin or bolt to undergo out-of-plane deformation, and the inter-ring joint Although the rigidity and proof stress may be reduced, by attaching the C-shaped reinforcing member 5 in the longitudinal direction of the main girder, the load is evenly distributed to the main girder 1 due to the rigidity of the reinforcing member 5 and local stress. Since the increase can be prevented and the deformation of the main girder 1 in the out-of-plane direction can be suppressed, the shear strength is improved.

(Examples and Comparative Examples)
When the composite segment having the reinforcing structure of the segment connecting portion of the present invention is applied to a tunnel having an outer diameter of 5.9 m, as a comparative example, the joint plate and its reinforcing structure are all manufactured by casting as in Patent Document 2. Compared to, the processing cost has dropped to about 1/4. In addition, as a comparative example, when only the periphery of the fastening portion is welded in combination with a reinforcing plate as in Patent Document 1, local out-of-plane deformation of the joint plate due to the thermal effect during welding occurs and manufacturing tolerances are increased. However, it took a great deal of labor to repair the predetermined flatness of the joint plate, but by using the reinforcing structure of the present invention, the locality of the joint plate during welding Repair work is no longer necessary. In addition, since the reinforcing structure of the present invention is used, even when the joint portion is bent after the joint is fastened, the joint plate hardly deforms in the out-of-plane direction, and the lever reaction force acting on the fastening portion is not generated. The rigidity and proof stress of the joint as a whole improved.

It is a perspective view of steel or a synthetic segment single-piece | unit which shows the reinforcement structure when the connection part by the side of a coupling board based on this invention is reinforced. It is sectional drawing when the coupling board of FIG. 1 is connected with the volt | bolt. It is a perspective view of a reinforcing member having a C-shaped cross section. It is sectional drawing in the case where both ends of the reinforcing member having a C-shaped cross section are in contact with the main girder. It is sectional drawing when the both ends of a reinforcement member do not contact | connect a main girder.

Explanation of symbols

1 Main girder 2 Joint plate 3 Skin plate 4 Bolt insertion hole 5 Reinforcement member with a C-shaped cross section (channel steel)
6 Bolt 7 Nut 8 Concrete 9 Flange 10 Web 11 End of C-shaped reinforcing member 12 Notch hole for bolt fastening work 13 Segment 14 Lid

Claims (3)

Main girder, the joint plate, and a reinforcing structure of the connecting portion of the synthetic segments formed by filling the medium packed concrete steel segment or steel shell made of steel shell having a skin plate, fitting plates or between the main girder A reinforcing member having a C-shaped cross section is attached to the inner side of the steel plate of the joint plate or main girder in the longitudinal direction so as to cover the whole connecting member that is fastened with each other interposed therebetween. Reinforced structure of steel or synthetic segment connecting parts.   Both ends of the reinforcing member in the longitudinal direction are main girders arranged on both sides of the joint plate to which the reinforcing member is attached, or joint plates arranged on both sides of the main beam to which the reinforcing member is attached. The reinforcing structure of a steel or synthetic segment connecting portion according to claim 1, wherein the reinforcing structure is attached.   The reinforcing structure of a steel or synthetic segment connecting portion according to claim 1 or 2, wherein the reinforcing member is channel steel.

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