JP2014222001A - Fixing structure of flexible joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing structure of a flexible joint which can be flexibly constructed and provided at a low cost.SOLUTION: A fixing structure 12 fixes a flexible joint 1 which is used to cover a joint part 4 of pipe bodies 2 and 3. The fixing structure 12 includes: a pressing metal fixture 21 having a predetermined length extending in a length direction Y of a side edge 7 of the flexible joint 1 for pressing a flange part 9 which is provided along the side edge 7, so as to hold it in cooperation with the pipe body 3; a plurality of fixing metal fittings 22 for pressing the pressing metal fixture 21; and an anchor bolt 23 installed into the pipe body 3 for fixing the fixing metal fittings 22 in predetermined pitches. The fixing metal fitting 22 is formed by stepping a metallic L angle.

Description

  The present invention relates to a structure for fixing a flexible joint for water stoppage of an underground structure.

  The flexible joint is provided at a joint between concrete pipes constituting an underground structure such as a tunnel, and is used to cover the joint from the inside of the pipe. The flexible joint includes a flexible portion that covers the seam, and a fixing flange portion provided along both side edges of the portion. As a fixing structure for fixing such a flexible joint to an underground structure, for example, a fixing structure described in Patent Document 1 has been proposed.

In the fixing structure of FIG. 7 of Patent Document 1, the flange portion of the flexible joint is fixed by a nut screwed into the tip of an anchor bolt protruding from the underground structure via a pressing plate. Insertion holes for inserting anchor bolts are formed in the holding plate and the flange portion at a predetermined pitch, and the anchor bolts are arranged in alignment with these positions.
In the fixing structure shown in FIG. 2 of Patent Document 1, the flange portion of the flexible joint is pressed by the pressing plate, and the pressing plate is pressed by the fixing member. Further, the fixing member is fixed by a nut screwed into the tip of the anchor bolt protruding from the underground structure.

JP 2010-150807 A

By the way, when installing a flexible joint in an underground structure, the positions of existing reinforcements and pipes in the concrete frame of the underground structure are investigated in advance, and it is decided not to interfere with the investigated reinforcements and pipes. Anchor bolts for fixing the flexible joint are driven at the designed positions.
However, the actual position of the reinforcing bar and the pipe is different from the investigated position, and the anchor bolt at the design position and the existing reinforcing bar and the pipe may interfere with each other. In this case, the position of the anchor bolt must be changed in the field to a position that does not interfere with the design position. As a result, it takes time to construct the flexible joint.

For example, in the fixing structure shown in FIG. 7 of Patent Document 1, the position of the anchor bolt is determined according to the position of the insertion hole of the flange portion. Therefore, the insertion hole of the flange portion is set in accordance with the position of the changed anchor bolt. It is necessary to open it again and rebuild the holding plate.
Further, in the fixing structure shown in FIG. 2 of Patent Document 1, it is not necessary to add or rework parts in accordance with the change in the position of the anchor bolt. However, since the fixing member has a complicated structure in which a pair of ribs are erected from the side edge of the plate member having a step, the manufacturing cost is high.

  The present invention has been made in view of such a conventional technique, and a main object thereof is to provide a flexible joint fixing structure that can be applied flexibly and can be provided at low cost.

  The invention according to claim 1 is a fixing structure of a flexible joint used so as to cover a joint portion of an underground structure, and includes flange portions provided along both side edges of the flexible joint. A step is provided in the metal L angle for holding the holding metal and the holding metal having a predetermined length extending in the length direction of the side edge for holding the metal structure in cooperation with the underground structure. The fixing structure includes a plurality of fixing brackets and anchor bolts placed on the underground structure for fixing the fixing brackets at a predetermined pitch.

According to a second aspect of the present invention, the pressing metal has a U-shaped cross-section that forms an opening in the upper part, and a welded flat plate-like part is fitted into the opening on the back surface of the fixing metal. The fixing structure according to claim 1, wherein the fixing structure is provided.
Invention of Claim 3 is a fixing structure of the flexible joint used so that the joint part of an underground structure may be covered, Comprising: The said flexible joint is provided with a pair of flange part along a both-sides edge. A fixing structure characterized in that at least one flange portion of the pair of flange portions is fixed by a pressing metal fitting of the fixing structure described in claim 1 or 2, a fixing metal fitting, and an anchor bolt. It is.

  According to the first aspect of the present invention, since the long pressing metal fitting and the plurality of fixing metal fittings are interposed between the flange portion and the anchor bolt, depending on the situation of the underground structure when the flange portion is fixed. The position of the anchor bolt can be changed and construction can be made flexibly. In addition, since the fixing bracket has a step formed on the metal L angle, it has a simple structure and can be manufactured at low cost.

According to the second aspect of the present invention, it is possible to easily and reliably prevent the displacement between the fixing metal fitting and the holding metal fitting. Therefore, the fixing work is facilitated. In addition, the flexible joint can be securely fixed when an earthquake occurs.
According to invention of Claim 3, fixation of at least one of a pair of flange parts of a flexible joint can be flexibly constructed according to the situation of an underground structure, and can be provided at low cost.

FIG. 1 is a partial cross-sectional view of fixing structures 11 and 12 of a flexible joint 1 including a fixing structure 12 according to an embodiment of the present invention. FIG. 2 is a plan view of the fixing structure 12. FIG. 3 is an exploded perspective view of the fixing structure 12.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a partial cross-sectional view of fixing structures 11 and 12 of a flexible joint 1 including a fixing structure 12 according to an embodiment of the present invention. FIG. 2 is a plan view of the fixing structure 12. FIG. 3 is an exploded perspective view of the fixing structure 12.
With reference to FIG. 1, the flexible joint 1 is arrange | positioned inside the joint part 4 of the pipe bodies 2 and 3 (only one part is shown) embed | buried under two opposing underground structures, for example, underground. . In FIG. 1, the inner space surrounded by the tubular bodies 2 and 3 is shown. The pair of pipe bodies 2 and 3 are embedded in the basement adjacent to each other so that the inside thereof communicates with each other, and constitute at least a part of an underground structure such as a tunnel. The joint part 4 which is the joint of the pipe bodies 2 and 3 is comprised by the cyclic | annular elastic joint arrange | positioned along the end surface of the pipe bodies 2 and 3, for example. The flexible joint 1 is attached so as to cover the inside of the joint portion 4.

  The flexible joint 1 extends in the direction perpendicular to the paper surface of FIG. The flexible joint 1 has side edges 6 and 7 on both sides as seen in the connection direction X (hereinafter simply referred to as the direction X) of the tubular bodies 2 and 3. The flexible joint 1 is formed with flange portions 8 and 9 along the side edges 6 and 7 on the inside thereof, and an intermediate portion 10 is provided between the flange portions 8 and 9. The intermediate portion 10 has a cross-sectional waveform and can be expanded and contracted in the direction X.

The flexible joint 1 has a configuration in which a fiber base fabric is disposed between rubber layers. As the rubber, for example, natural rubber, chloroprene, or EPDM rubber can be used. As the fiber base fabric, for example, a nylon base fabric can be used.
The flange portion 8 illustrated on the left side in FIG. 1 is fixed to the (inner) surface of the tube body 2 by a first fixing structure 11. The flange portion 9 shown on the right side in FIG. 1 is fixed to the (inner) surface of the tube body 3 by the second fixing structure 12 according to the present invention.

First, the first fixing structure 11 will be briefly described.
The first fixing structure 11 includes a pressing plate 16 for overlapping and pressing on the flange portion 8, and an anchor bolt 17 placed on the tube body 2 for passing through and fixing the pressing plate 16 and the flange portion 8. And a nut 18 screwed onto the anchor bolt 17.
The anchor bolts 17 are driven into the pipe body 2 at a predetermined pitch in the length direction of the joint portion 4 (corresponding to the direction perpendicular to the paper surface of FIG. 1; hereinafter also referred to as the length direction Y). Insertion holes are formed in the portion 8 in accordance with the placement pitch of the anchor bolts 17, and insertion holes are also formed in the holding plate 16 corresponding to the anchor bolts 17.

The flange portion 8 is formed in a flat plate shape from the vicinity of the intermediate portion 10 to the vicinity of the side edge 6, and a protrusion is formed near the side edge 6. A plurality of the insertion holes are formed in the flange portion 8 at a predetermined pitch.
The pressing plate 16 is a metal flat plate extending in the length direction Y of the side edge 6 and has a plurality of insertion holes at positions corresponding to the insertion holes of the flange portion 8 as described above.

The anchor bolt 17 is fixed to the tube body 2, and one end thereof protrudes from the (inner) surface of the tube body 2.
An insertion hole of the flange portion 8 and an insertion hole of the pressing plate 16 are passed through one end of the anchor bolt 17, and the pressing plate 16 is superimposed on the flange portion 8. A nut 18 is screwed to one end of an anchor bolt 17 extending from the press plate 16. By tightening the nut 18, the flange portion 8 is sandwiched and tightened together between the (inner) surface of the tube body 2 and the pressing plate 16.

Next, the second fixing structure 12 will be described. The second fixing structure 12 is a fixing structure according to an embodiment of the present invention.
Referring to FIGS. 1 and 2, the second fixing structure 12 includes a pressing metal 21 for pressing the flange portion 9 so as to be sandwiched in cooperation with the tubular body 3, and a plurality of the pressing metal 21 for holding the pressing metal 21. Each of the fixing brackets 22 includes an anchor bolt 23 placed on the pipe body 3 for fixing each fixing bracket 22, and a nut 24 screwed to the anchor bolt 23.

  The flange portion 9 is formed in a flat plate shape from the vicinity of the intermediate portion 10 to the vicinity of the side edge 7, and a protrusion is formed near the side edge 7. The flange portion 9 does not have an insertion hole, and except for this, the flange portion 9 is formed in the same shape so as to be symmetrical with respect to the direction X with respect to the flange portion 8. Hereinafter, although it demonstrates in accordance with this aspect, the shape of the flange part 9 is good also as a shape different from the flange part 8. FIG.

A presser fitting 21 is overlaid on the flat plate-like portion of the flange portion 9, and a part of the fixing metal fitting 22 is overlaid on a part of the holding metal fitting 21, and the fixing metal fitting 22 is attached to the anchor bolt 23. It is tightened with.
The anchor bolts 23 are disposed outside the side edges 7, and a plurality of the anchor bolts 23 are erected so as to be spaced apart from each other at a predetermined pitch P along the length direction Y of the side edges 7. Each anchor bolt 23 is driven and fixed to the tube body 3, and one end of the anchor bolt 23 protrudes from the (inner) surface of the tube body 3 and penetrates the fixing fitting 22. A male screw is formed at one end of the anchor bolt 23 penetrating the fixing bracket 22, and a nut 24 is screwed to the male screw.

The anchor bolt 23 and the nut 24 fasten and fix the fixing bracket 22, and the fixing bracket 22 presses the holding fitting 21. The flange portion 9 is attached to the (inner) surface of the tube body 3 through the holding fitting 21. It is pressed down and fixed.
In the second fixing structure 12, the flange portion 9 is pressed by the anchor bolt 23, and the long pressing metal 21 and the plurality of fixing metal plates 22 are interposed therebetween. The position of the anchor bolt 23 can be changed according to the state of the object, and construction can be performed flexibly. Moreover, since the anchor bolt 23 is disposed outside the flange portion 9, it can be disposed with a higher degree of freedom.

  For example, the position of the anchor bolt 23 can be freely set as long as it is within the range of the length of the presser fitting 21 in the longitudinal direction Y and the pitch P is within a predetermined range. Therefore, when the reinforcing bar in the tubular body 3 and the anchor bolt 23 interfere with each other at the installation site of the flexible joint 1, the position of the anchor bolt 23 can be easily changed on the site so as not to interfere. Therefore, workability on site can be improved.

  Referring to FIGS. 1 and 3, the holding metal fitting 21 is a long member that extends in the length direction Y and has a predetermined length, and has a width substantially the same as that of the flat plate portion of the flange portion 9 in the direction X. Is formed. The holding metal 21 has a U-shaped cross section (groove shape) cut in the longitudinal direction, and is arranged so that the U-shape is opened toward the side opposite to the flange portion 9 (hereinafter also referred to as the upper side). Has been. An opening 26 having a constant width is formed in the upper part of the presser fitting 21. Specifically, the holding metal fitting 21 is a metal groove-shaped material, for example, a groove-shaped steel, and has a length of about 1 to 5 meters in the length direction Y.

  With reference to FIGS. 2 and 3, the fixing bracket 22 fixes the pressing bracket 21 at an arbitrary position in the length direction Y within the range of the length of the pressing bracket 21. The plurality of fixtures 22 are arranged at an arbitrary pitch P within a predetermined range in the length direction Y of the side edge 7. As the pitch P, for example, a value that does not cause interference between the anchor bolt 23 and the reinforcing bar arrangement (not shown) of the underground structure is employed. The maximum value of the pitch P can be increased by increasing the rigidity of the fixing bracket 22 and the rigidity of the presser bracket 21, but the predetermined range of the pitch P is preferably set to 200 to 300 mm.

  The fixing bracket 22 is a long member extending in the direction X. The fixing fitting 22 has an insertion hole 27 for allowing the anchor bolt 23 to pass in an intermediate portion in the direction X. The fixing bracket 22 has a pair of pressing portions 28 that press the edge of the opening 26 at the top of the pressing bracket 21 at one end near the pressing bracket 21 in the direction X. The fixing bracket 22 is provided between the pair of pressing portions 28 and has a flat plate-like portion 29 as a fitting convex portion that is fitted into the opening 26 on the upper portion of the pressing bracket 21.

The flat plate-like portion 29 is fitted to the pair of edges of the opening 26 at the upper portion of the presser fitting 21 so as not to be relatively movable in the direction X without gaps, and is relatively movable in the length direction Y. The fitting position in the length direction Y can be freely changed.
The flat plate-like portion 29 is a metal flat plate (steel plate) having a rectangular thickness in plan view, and has two parallel surfaces extending in the length direction Y. The distance between these two surfaces is substantially equal to the width dimension (dimension in the direction X) of the opening 26 at the top of the presser fitting 21.

With reference to FIG. 1 and FIG. 3, since the flat plate-like portion 29 is fitted into the opening 26 at the top of the presser fitting 21, between the fixed metal fixture 22 and the presser fixture 21 in the direction X and the vertical direction Z. Misalignment can be easily and reliably prevented. Therefore, the fixing work is facilitated. Further, the flexible joint 1 can be reliably fixed when an earthquake occurs.
The fixing bracket 22 has a portion 30 that is fastened by an anchor bolt 23 that passes through the insertion hole 27 adjacent to the pressing portion 28. The portion 30 to be fastened has an insertion hole 27. Further, the portion 30 to be fastened has a protruding portion that protrudes from the portion where the insertion hole 27 is formed toward the tubular body 3 at a predetermined height. The protruding portion is disposed at an end portion on the side far from the presser fitting 21 in the direction X in the portion 30 to be fastened, and by this protruding portion, the back surface portion in the vicinity of the insertion hole 27 and the tubular body 3 (inner) surfaces are opposed to each other with a gap. As a result, when the anchor bolt 23 and the nut 24 are tightened, the fixing bracket 22 can elastically press the pressing bracket 21 and can be securely fixed.

Further, a fulcrum is formed at the tip of the projecting portion of the portion 30 to be fastened so as to abut on the (inner) surface of the tube body 3 and rotatably support it. Thereby, it can fix reliably without unreasonableness. The fulcrum is formed by a cylindrical metal bar 30a.
The bar 30a extends along the length direction Y, and the length thereof is substantially equal to the width dimension (dimension in the length direction Y) of the fixing bracket 22.

The bar 30a forming the fulcrum may be constituted by two cylindrical members having the same diameter and the same diameter, which are arranged apart from each other in the length direction Y. Further, the fulcrum may be formed integrally with the fixing bracket 22 by a single member. Furthermore, it is conceivable to eliminate the bar 30a. Below, it demonstrates according to the case where the bar 30a is used.
In the vertical direction Z, the distance between the fulcrum as the lowermost portion of the portion 30 to be fastened and the presser 28 is such that the upper surface of the presser fitting 21 and the (inner) surface of the tubular body 3 superimposed on the flange 9 at the time of fastening. And is approximately equal to the distance.

  Specifically, the fixing bracket 22 has a structure in which a step is formed on a metal L angle. Therefore, the fixture 22 has a simple structure and can be manufactured at low cost. The L angle as a raw material is a long member, and the cross-sectional shape that cuts the longitudinal direction is L-shaped. The L angle has a pair of long plate portions, and the long edges of the plate portions are connected to each other at a right angle. A straight L angle is bent in two opposite directions in the longitudinal direction to form a substantially S-shape. Thereby, the schematic shape of the fixing bracket 22 is formed.

  The fixing bracket 22 has a long stepped plate 35 and a straight rib 36 erected from one end edge in the width direction of the stepped plate 35. The stepped plate 35 includes a first flat plate portion 37, a second flat plate portion 38, and a step portion 39 that connects them with a step. The first flat plate portion 37 forms an end portion of the fixing metal fitting 22 near the holding metal fitting 21 in the direction X. The second flat plate portion 38 forms an intermediate portion of the fixing bracket 22 with respect to the direction X and an end portion of the fixing bracket 22 on the side farther from the pressing bracket 21.

A pair of pressing portions 29 are provided on the back surface 31 of the first flat plate portion 37, and the flat plate portion 29 is fixed by welding therebetween. The insertion hole 27 is formed in the 2nd flat plate part 38, and the bar 30a is welded, Thereby, the part 30 fastened is comprised. The bar 30a functions as a protruding portion of the portion 30 to be fastened.
Note that the first fixing structure 11 and the corresponding flange 8 and the second fixing structure 12 and the corresponding flange 9 may be arranged in the left-right direction with respect to the direction X. Further, the second fixing structure 12 may be applied to both the pair of flange portions 8 and 9.

  Each flange portion 8 and 9 has an insertion hole for the anchor bolt 17 of the first fixing structure 11 and can be pressed by the pressing plate 16 of the first fixing structure 11, and the second fixing structure. You may have the shape which can be hold | suppressed with the 12 pressing metal fittings 21. FIG. In this case, the flange portions 8 and 9 can be fixed by selecting either the first fixing structure 11 or the second fixing structure 12.

The second fixed structure 12 includes, in addition to the connecting portions of the pipes 2 and 3, a connecting portion between the casings in the underground structure, an underground passage related to construction, an irrigation channel, a water treatment facility (sewage, tap water) It can be applied to water treatment plants and pump stations).
In addition, various design changes can be made within the scope of matters described in the claims.

1 Flexible joint 2, 3 Tube (underground structure)
4 Joint portion 6, 7 Side edge 8, 9 Flange portion 12 Second fixing structure 21 according to the present invention Presser bracket 22 Fixing bracket 23 Anchor bolt 26 Opening portion 29 Flat plate portion 31 Back surface P Pitch Y Length direction

Claims (3)

A flexible joint fixing structure used to cover joints of underground structures,
A holding metal fitting having a predetermined length extending in the length direction of the side edge for holding the flange portion provided along both side edges of the flexible joint so as to be sandwiched in cooperation with the underground structure. When,
A plurality of fixing brackets having steps formed on a metal L angle for holding the pressing bracket;
An anchor bolt that is placed on the underground structure for fixing each of the fixing brackets at a predetermined pitch. The presser fitting is a U-shaped cross section that forms an opening in the upper part,
The fixing structure according to claim 1, wherein a welded flat plate-like portion is provided on the back surface of the fixing metal fitting so as to fit into the opening. A flexible joint fixing structure used to cover joints of underground structures,
The flexible joint includes a pair of flange portions along both side edges,
A fixing structure characterized in that at least one of the pair of flange portions is fixed by a pressing metal fitting of the fixing structure described in claim 1 or 2, a fixing metal fitting, and an anchor bolt.

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