JP4718300B2 - Underground flexible joint - Google Patents

Description

  The present invention relates to a flexible joint for a culvert, and is a flexible joint used for connecting a culvert such as a cave, water supply and sewerage system, a subway, a common groove, etc. Even if the shape of the culvert is a combination of a circular cross section and a rectangular cross section, etc. It is a flexible joint that can be installed and positioned, and is particularly suitable for the connection between a shield pipe line and a connection hole connected to the shield pipe line.

  Conventionally, there is a shield tunneling method as one of the methods for constructing a culvert, and a shield pipe line is constructed while assembling segments.

  In the construction using this shield digging method, a temporary pit is set up with steel sheet piles at the starting and reaching parts up to a pipe depth of more than 10 meters. After the construction is completed, the temporary pit is connected to the shield pipe. It is done to build a connection hole.

  For example, as shown in FIG. 6, the connecting manhole is constructed in a cut-off temporary establishment mine between several meters to the shield pipe 1, a pipe with a circular cross section and a circular cross section inside. Assemble the same segment used in the field-placed concrete structure 2 or shield excavation with the pipe and the connecting pipe 3 of the concrete structure 2 and the connecting manhole 3 In order to provide seismic resistance, a flexible joint is installed between the pipe line and the connecting manhole.

As such a flexible joint for shafts, there is one disclosed in Patent Document 1, which is provided between the horizontal surfaces of the intermediate part of the shaft, thereby imparting earthquake resistance to the shaft itself.
JP-A-8-41921

  However, when trying to install a flexible joint between the conduit of a culvert and a connecting manhole, the pipe is circular, whereas the on-site cast-in concrete structure installed in the temporarily established mine is In most cases, the flexible joint is a round shape that matches the cross section of the shield pipe for strength and structure, so it can be used between the round pipe and the rectangular concrete structure. There is a problem that positioning and installing the flexible joint and subsequent concrete placement work of the concrete structure are difficult.

  The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a culvert flexible joint that can be easily installed and positioned regardless of the cross-sectional shapes of the culverts connected to each other.

The flexible joint of the undercarriage according to claim 1 of the present invention that solves the problems of the prior art is provided with a pair of opposing concretes each having a rectangular cross section on the outer side and a circular cross section on the inner pipe line. A flexible joint provided between the culverts, and a pair of circular annular mounting frames provided with fixing means to the end of the culvert, and the culverts provided outside the pair of mounting frames. It is formed in a substantially short cylinder shape made of an elastic body such as rubber / synthetic resin attached between the pair of mounting frame bodies and a rectangular mold body that matches the outer shape of the pair of mounting frame bodies. It consists of a stiffening water member and a joint member provided in a shape that matches at least a rectangular outer shape between the mounting frame bodies and between the mold frame bodies.

According to the flexible joint of this culvert, it is a flexible joint provided between a culvert formed by placing a pair of opposing concretes with a rectangular cross section on the outside and a circular cross section on the inside thereof, A rectangular mold frame that matches the outer shape of the culvert is provided on the outside of the pair of circular annular mounting frames having fixing means for the end of the culvert, and rubber, synthetic resin, etc. straddle between these mounting frames A flexible water-stopping member that is formed in a substantially short cylindrical shape and is provided with an expansion / contraction part at the middle is attached, and a joint member having a shape that matches at least the rectangular outer shape between the attachment frames and between the molds is provided. By placing the flexible joints that are provided and arranged at the ends of the culverts that connect to each other and placing concrete, it is easy to position with a mold body that matches the rectangular external shape of the culverts, and a circular annular mounting frame Flexible joints can be installed easily by placing concrete into the body. Kill as to become.

According to a second aspect of the present invention, the flexible joint of the undercarriage is configured by providing a position adjusting means on a portion of the mold body located outside the undercarriage in addition to the structure of the first aspect. It is characterized by this.

According to the flexible joint of the undercarriage, the position adjustment means is provided on the portion of the mold body located outside the undercarriage, and the flexible joint can be more easily achieved by the position adjustment means outside the undercarriage. The installation position can be adjusted and installed.

  Furthermore, the flexible joint of the undercarriage according to claim 3 of the present invention, in addition to the structure according to claim 1 or 2, is connected by providing a width stop member between the mold bodies, and is provided with a hanging metal fitting. It is configured to be able to be lowered.

  According to the flexible joint of the undercarriage, a width stop member is provided and connected between the mold bodies, and a suspension fitting is provided so as to be able to hang down. By connecting with the width stop member, a factory or the like It is possible to suspend the assembly assembled in (1) to the connecting part of the culvert through the hanging metal fittings, and it is possible to more easily position and install it, and to remove it after completion.

According to the flexible joint of a culvert according to claim 1 of the present invention, between a culvert formed by placing a pair of opposing concretes, the outer side of which has a rectangular cross section and the inner pipe line of which has a circular cross section. The flexible joint provided is provided with a rectangular mold frame that matches the outer shape of the undercarriage on the outside of a pair of circular annular attachment frames provided with fixing means for the end of the undercarriage, and between these attachment frames A flexible water-stopping member that is formed in a substantially short cylinder shape made of an elastic body such as rubber and synthetic resin and that has an expansion / contraction part in the middle is attached to the outer side of the rectangle at least between the mounting frame and between the molds Since the joint members are arranged and configured, they are placed on the ends of the culverts that are connected to each other, and the concrete is placed, so that it can be easily positioned with the formwork that matches the rectangular shape of the culvert. A flexible joint with a circular annular mounting frame can easily be made of concrete. It can be installed by the set.

  Thereby, while being able to make it the shape matched with the external shape of the undercarriage with the formwork body, the flexible joint can be easily positioned together with the circular annular mounting frame body and installed by placing concrete.

Further, according to the flexible joint of the undercarriage according to claim 2 of the present invention, since the position adjusting means is provided in the portion of the mold body located outside the undercarriage, the position adjusting means outside the undercarriage is provided. Thus, the installation position of the flexible joint can be adjusted and attached more easily.

  Furthermore, according to the flexible joint of the undercarriage according to claim 3 of the present invention, the width stop member is provided and connected between the mold bodies, and the suspension fitting is provided so as to be able to be suspended. By connecting with members, flexible joints assembled at factories and the like can be hung down to the connection part of the culvert through the hanging bracket, and can be positioned and installed more easily, and easily after completion It can be removed to give flexibility.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 4 relate to an embodiment of a flexible joint of a culvert of the present invention, FIG. 1 is a schematic perspective view of the culvert, FIG. 2 is a front view of the flexible joint, and FIG. FIG. 4 is a front view of the flexible water-stopping member, a front view of the presser plate of the water-stopping member, and a cross-sectional view of the flexible joint in a suspended state.

  This undercarriage flexible joint (hereinafter simply referred to as a flexible joint) 10 is constructed in a temporary pit formed by a steel sheet pile or the like provided at the starting and reaching part in shield excavation work, for example, as shown in FIG. When building a connecting hole with a horizontal cross section of a rectangular shape and a vertical cross section of a circular shape after completion, the outer shape is a rectangular cross section within a few meters to the shield conduit 1 in the excavated temporary pit. Assembling the same cast-in-place concrete structure 2 with a circular cross-section inside, or the same segment used in shield digging, It is provided between the connecting hole 3 and used to ensure earthquake resistance. The construction portion of the flexible joint 10 has the same rectangular cross section as the front and rear rectangular cross sections.

  The flexible joint 10 includes a pair of annular and plate-like mounting frames 14 disposed on the end surfaces 13 of the joint portions 12 of the opposite culverts 11 constituted by the concrete structure 2 and the connecting person holes 3, for example. These mounting frame bodies 14 have a plurality of L-shaped anchor members 15 embedded and fixed in the concrete to be placed in the undercarriage 11 (36 in the illustrated example) at equal circumferential intervals by welding or the like. Book) is attached.

  As shown in FIG. 2, the annular and plate-like attachment frame body 14 has a circular shape corresponding to the cross-sectional shape of the conduit 16 of the underdrain 11 and the shape of the flexible water blocking member 21.

  As shown in FIG. 2, a circular hole smaller than the outer diameter of the mounting frame body 14 is formed on the outer periphery of the circular annular mounting frame body 14, and the outer shape of the plate-shaped mold is rectangular. The frame body 17 is attached by welding or the like, and the lateral reinforcing material 18 made of an angle material or the like is attached to the rectangular upper and lower joint sides of the mold body 17 by welding or the like.

  A vertical reinforcing member 19 made of an angle member or the like is attached to the left and right undersides of the rectangular form 17 by welding or the like, and a position adjusting mechanism is provided on a portion of the vertical reinforcing member 19 that is outside the underside 11. The level adjustment bracket 20a constituting the base 20 is attached with a bolt 20b, and a screw jack 20c is attached to the level adjustment bracket 20a to adjust the level of the mold body 17 by the expansion and contraction of the screw. Can be adjusted.

  In addition, this position adjustment mechanism 20 installs the flexible joint 10, removes from the formwork body 17 with the volt | bolt 20b after concrete placement, and is reused.

  Further, the flexible joint 10 has a substantially short tubular flexible water-stopping member 21 attached to a joint portion 12 inside the mounting frame 14 facing the flexible joint 10.

As shown in FIG. 4 (a) , the flexible water blocking member 21 is formed in a substantially short cylindrical shape by an elastic body such as rubber or synthetic resin, and is formed in a U-shaped cross section on the inner peripheral side at the intermediate portion. A flange having a plurality of projecting portions 21a that are perpendicular to the cylindrical portion 21b through the cylindrical portion 21b and are parallel to the end surface 13 of the undercarriage 11 and increase adhesion, on both sides of the expanding and contracting portion 21a. It is formed integrally with a portion 21c, and a reinforcing cloth 21d for reinforcement is placed inside.

  The outer surfaces of the flange portions 21 c at both ends of the flexible water-stopping member 21 are respectively applied to the mounting frame body 14, and are fastened to the mounting frame body 14 with bolts and nuts 23 via the water-stopping member pressing plate 22. .

The water stop member presser plate 22 includes an arc plate-like flange fixing portion 22a arranged in parallel with the mounting frame 14 for fixing the flexible water stop member 21 while positioning the flange member at one end thereof. An arc plate-like cylindrical portion support portion 22b that is perpendicular to the portion fixing portion 22a is provided, and a contact plate portion 22c that adjusts the tightening margin by being applied to the inner surface of the mounting frame 14 protrudes from the other end portion. The flexible water-stopping member 21 is used for each of a plurality of bolts and nuts 23 for fixing the mounting frame 14 using a plurality of parts divided into a plurality in the circumferential direction. Crimp and fix.

  Furthermore, in this flexible joint 10, in order to seal the joint portion 12 on the inner peripheral side of the flexible water-stopping member 21, a first joint member 24 is disposed between the bolt and nut 23, and the inner peripheral portion A second joint material 25 is disposed between the mounting frames 14, and an L-shaped joint material support attached with bolts / nuts 27 via joint material support bracket fixing plates 26 attached to the mounting frame 14 by welding or the like. The inner peripheral side of the second joint material 25 is supported by the metal fitting 28, and the third joint material 29 interposed between the end faces 13 of the undercarriage 11 is sandwiched between the joint material support metal fittings 28 so as to be supported. It is.

  These first to third joint materials 24, 25, and 29 are made of foamed rubber, for example, so as to absorb a displacement such as an earthquake and stop water, and to prevent intrusion of concrete to be placed. It is.

  Moreover, in this flexible joint 10, in order to seal the joint part 12 of the outer periphery side of the flexible water-stopping member 21, the 4th joint material 30 is arrange | positioned between the attachment frame bodies 14, and it is provided in the outer periphery and attached. While being pressed by a skin plate 31 attached to the frame body 14 by welding or the like, a fifth joint material 32 is disposed between the mold frame bodies 17 on the outer peripheral side of the skin plate 31.

  As the fourth joint material 30 and the fifth joint material 32, for example, those made of foamed rubber are used.

  Therefore, in the flexible joint 10, the joint portions 12 of the pair of undercuts 11 facing each other are filled and filled with the first to fifth joint materials so as to be sealed.

  Further, a waterproofing material 33 made of water-expandable rubber or the like is attached to the outer side of the formwork 17 in contact with the concrete on which the flexible joint 10 is placed, and the outside of the joint portion 12 is sealed. And stop the water.

  The flexible joint 10 configured as described above is assembled in advance in a factory and disposed on the end surface 13 of the joint portion 12 of the pair of undercarriages 11. In this case, in order to facilitate the suspension and installation work, FIG. As shown in (c), a plurality of width stop members 34 for connecting the pair of mold bodies 17 are attached between the horizontal reinforcing member 18 and the vertical reinforcing member 19, and a hanging metal fitting 35 is attached to the upper side portion. It can be hung.

Thereby, after completion, the width stop member 34 and the hanging metal fitting 35 located outside can be easily removed, and flexibility can be imparted.
And when constructing such a flexible joint 10, the level is adjusted by hanging down to a predetermined position between the culverts 11 using the hanging fitting 35 and adjusting the screw of the screw jack 20 c of the position adjusting mechanism 20. Thereby, positioning of the flexible joint 10 is performed.

  Further, a pipe formwork 36 for constructing a pipe line is arranged on the inner peripheral side of the innermost fifth joint material 32 of the joint part 12 of the flexible joint 10, and the end face of the concrete structure 2 and the connecting human hole are arranged. The end face molds (not shown) serving as the end faces 3 are respectively placed and concrete is placed.

  After the concrete is cured, the suspension fitting 35 and the width stop member 34 are removed, and the position adjusting mechanism 20 is removed.

  Thereby, the flexible joint 10 assembled in advance between the underdrains 11 can be installed and water can be stopped by the circular flexible water-stopping member 21, and the outer shape can be formed into a rectangle by the mold body 17.

  Therefore, using the flexible water-stopping member 21 having a circular shape in accordance with the cross-sectional shape of the shield pipe in terms of structure and strength, the connecting joint hole of the rectangular cross-section of the on-site cast concrete structure is formed into the flexible joint 10. By using, after performing installation and positioning work on site, concrete can be placed and constructed.

  In addition, after completion, the hanging bracket 35 and the width stop member 34 positioned on the outside can be easily removed, and the position adjusting mechanism 20 can also be easily removed.

  In the above-described embodiment, the case where the underdrains 11 on both sides of the flexible joint 10 are all made of a concrete structure has been described as an example. For example, as shown in FIG. When the other is constituted by the segment 40, the fixing means for fixing the attachment frame body 14 is replaced with the anchor member 15, and the segment connection member 41 for connection with the segment 40 is provided integrally with the attachment frame body 14. In this case, the bolts 42 may be connected together, or bolt fixing holes may be formed and connected by bolts and nuts. When both are constituted by segments 40, as shown in FIG. The segment connecting member 41 may be attached to both the attachment frames 14.

  In the above embodiment, the case of applying to the connection portion between the shield pipe line and the connection person hole has been described as an example. However, the present invention is not limited to this, and the outer shape is formed in a rectangular shape using a circular flexible water-stopping member. Thus, it can be widely applied when connecting underdrains.

1 is a schematic perspective view of a culvert according to an embodiment of a flexible joint of a culvert of the present invention. It is a front view of the flexible joint concerning one embodiment of the flexible joint of the underdrain of this invention. It is sectional drawing of the construction completion state concerning one Embodiment of the flexible joint of the undercarriage of this invention. 1 is a front view of a flexible water-stopping member, a front view of a presser plate of the water-stopping member, and a sectional view of a flexible joint in a suspended state according to an embodiment of a flexible joint of a culvert of the present invention. It is sectional drawing of the construction completion state concerning one each other embodiment of the flexible joint of the undercarriage of this invention. It is a schematic perspective view of a culvert with a conventional culvert flexible joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Undercarriage flexible joint 11 Undercarriage 12 Joint part 13 End surface 14 Mounting frame 15 Anchor member 16 Pipe line 17 Mold frame 18 Lateral reinforcement member 19 Vertical reinforcement member 20 Position adjustment mechanism 20a Level adjustment bracket 20b Bolt 20c Screw jack 21 Possible Stiffening water member 21a Expansion / contraction part 21b Cylindrical part 21c Flange part 21d Reinforcement cloth 22 Waterproofing member pressing plate 22a Flange part fixing part 22b Cylindrical part support part 22c Stopping plate part 23 Bolt / nut 24 First joint material 25 Second Joint material 26 Joint material support bracket fixing plate 27 Bolt / nut 28 Joint material support bracket 29 Third joint material 30 Fourth joint material 31 Skin plate 32 Fifth joint material 33 Water stop material 34 Width stop member 35 Suspension bracket 36 Pipe line Formwork 40 Segment 41 Segment connecting member 42 Bolt

Claims (3)

A flexible joint provided between a culvert formed by placing a pair of opposing concretes having a rectangular cross section on the outside and a circular cross section on the inside thereof,
A pair of circular annular mounting frames comprising means for fixing to the end of the culvert;
A rectangular formwork body that is provided outside the pair of mounting frame bodies and that matches the outer shape of the underdrain,
A flexible water-stopping member that is mounted across the pair of mounting frame bodies and is formed in a substantially short cylindrical shape made of an elastic body such as rubber or synthetic resin, and has an expansion / contraction part in the middle part;
A flexible joint of a culvert comprising at least a joint member provided in a shape matching a rectangular outer shape between the mounting frame bodies and between the mold frame bodies.   The flexible joint for a culvert according to claim 1, wherein a position adjusting means is provided in a portion of the mold body located outside the culvert. The flexible joint for a culvert according to claim 1 or 2, wherein a width stop member is provided and connected between the mold bodies, and a hanging metal fitting is provided so as to be able to be suspended.

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