JP2012225037A - Fixation structure for extension joint for concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixation structure for an extension joint for a concrete structure that facilitates construction as necessary members are manufactured in advance without reference to fitting positions of anchor bolts.SOLUTION: The fixation structure for an extension joint for a concrete structure includes a flexible extension joint 23 arranged over a joint part 22 between concrete structures 21, 21, press members 27 applied to anchorage portions 23c of both ends of the extension joint 23 to hold them with the concrete structures 21, 21, and fixation members 28 which press the anchorage portions 23c by pressing the press member 27 with anchor bolts 24 fitted to the concrete structures 21, 21. Consequently, the extension joint 23 can be fixed with surface pressure made uniform by dispersing a load without reference to the positions of the anchor bolts 24 by applying the press member 27 to the anchorage portions 23c of the extension joint 23 and fixing the fixation members 28 to the concrete structures 21, 21 by rotating the press member around the anchor bolts 24.

Description

  TECHNICAL FIELD The present invention relates to a fixing structure for an expansion joint for a concrete structure, and installs a flexible expansion joint at a joint portion of a concrete structure such as a water channel, a water treatment facility, a tunnel, a joint groove constructed with concrete, and stops. It is possible to prevent damage to the structure by allowing water and relative displacement, and is particularly suitable for repair.

  In the joints of walls such as waterways, water tanks or underground gutters built in the ground such as joint grooves, which are concrete structures constructed with concrete, water is stopped inside and outside and the concrete structures on both sides of the walls are unequal. It is necessary to allow expansion and contraction of the wall due to subsidence, earthquake displacement, temperature change, etc. Flexible expansion joints such as rubber and synthetic resin water stop plates are provided inside the concrete structure. A stiffening water structure is adopted.

  As such a flexible water-stopping structure, for example, there is a water-stopping structure disclosed in Patent Document 1, and, as shown in FIG. 7, U is placed in the middle of the joint material 1 in which an elastic material and one or more stress materials are embedded. While forming the groove-shaped extra length part 2 of a type | mold, and forming the joint material 1 by forming the latching parts 3 and 3 on both sides, the recessed part 6 formed in the joint part 5 between the concrete structures 4 and 4 The extra length portion 2 of the joint material 1 is accommodated in the joint member 1, and the engaging portions 3 and 3 on both sides are attached via anchor bolts 7 and presser plates 8 embedded and fixed in the concrete structures 4 and 4, respectively. Thereby, the protrusion of the joint material 1 to the inside of the concrete structures 4 and 4 is eliminated, and resistance to flow in the case of using a water channel is prevented.

  Such a water stop structure is constructed not only for newly constructing a concrete structure, but also for providing seismic reinforcement by being provided on an existing concrete structure, or for replacement and repair.

However, if this water-stopping structure is to be applied to an existing concrete structure such as a culvert, it is necessary to drill anchor bolts 7 for fixing the joint material 1 in the concrete structures 4 and 4 and attach them to the concrete structure. In some cases, it hits 4 or 4 rebars, and it is often necessary to attach the anchor bolt 7 by shifting the drilling position.
For this reason, it is necessary to measure the bolt pitch at the site when the anchor bolt 7 has been attached, and to manufacture the presser plate 8 and joint material 1 according to the result, and to perform drilling. However, there is a problem that the construction period is long.

  Therefore, a flexible water-stop structure has been proposed in which a necessary member can be manufactured in advance regardless of the mounting position of the anchor bolt, and a flexible water-stop member can be easily constructed (Patent Literature). 2, 3), for example, in the flexible water stop structure 10 of Patent Document 2, as shown in FIG. 8, the flexible stretchable portion 13 a disposed across the joint portion 12 between the concrete structures 11, 11 is provided. The presser member 17 is applied to the attachment portions 13b at both ends of the expansion joint 13 provided, the presser member 17 is pressed by the distal end portion 18a of the fixing member 18 to which the intermediate portion 18c is supported and fixed by the anchor bolt 14, and the base end portion By placing 18b against the concrete structure 11, the flexible waterproof joint 13 can be attached by pressing the holding member 17 at a predetermined position regardless of the attachment position of the anchor bolt 14. Unishi to have.

JP 2000-64446 A JP 2008-280748 A JP 2010-150807 A

According to such a flexible waterproof structure 10, although a necessary member can be manufactured in advance regardless of the anchor bolt mounting position, the flexible waterproof joint is directly fixed with the anchor bolt. In comparison, if the construction height is high or a flexible waterproof joint with a large expansion / contraction part is used, there is room for improvement such as an increase in construction width.
The present invention has been made in view of such prior art, and can manufacture necessary members in advance regardless of the mounting position of the anchor bolt. An object of the present invention is to provide a fixing structure for an expansion joint for a concrete structure that can reduce the sheath construction width.

  In order to solve the above-mentioned problem, the expansion structure for a concrete structure expansion joint according to claim 1 of the present invention includes a flexible expansion joint disposed across a joint between concrete structures, and the expansion joint of the expansion joint. An intermediate plate-like portion is fixed by a pressing member that is pressed against the adhesive portion at both ends and pressed between the concrete structures and anchor bolts attached to the concrete structure, and formed on both sides of the intermediate plate-like portion. And a fixing member that presses the pressing member at the distal end portion of both side plate portions and presses against the attachment portion. While the lip groove shape is formed, a locking protrusion that protrudes and locks into the groove of the holding member is formed at the tip of the both side plates of the fixing member. It is.

  The expansion structure for a concrete structure expansion joint according to a second aspect of the present invention is the flexible structure in addition to the structure according to the first aspect, wherein a storage portion is formed by a step portion opposed to a joint portion between the concrete structures. The expansion / contraction portion of the expansion joint is configured to be retractable.

  According to a third aspect of the present invention, there is provided a concrete structure expansion joint fixing structure according to the first or second aspect, wherein the holding member is attached to the both ends of the flexible expansion joint. A pair of protruding edges that can be clamped by flexibility are formed.

  The expansion structure for a concrete structure expansion joint according to a fourth aspect of the present invention is reinforced by fixing a reinforcing member to the holding member in addition to the structure according to any one of the first to third aspects. It is characterized by this.

  In addition to the structure according to any one of claims 1 to 4, the anchor structure for attaching the fixing member to the concrete structure is provided with an inclined hole. It is characterized in that it is provided with an upper protrusion margin that can be angle-corrected even if it is attached to.

  In addition to the structure according to any one of claims 1 to 5, the expansion structure for a concrete structure expansion joint for a concrete structure according to claim 6 of the present invention is substantially W-shaped in which the expansion / contraction part of the expansion joint is made continuous by an arc part. In addition, a circular cross-sectional shape is used, and the arc portion is configured with a large curvature radius.

According to the fixing structure of the expansion joint for a concrete structure according to claim 1 of the present invention, the flexible expansion joint disposed across the joint between the concrete structures, and the flanges at both ends of the expansion joint Both side plates formed on both sides of the intermediate plate-like portion by fixing the intermediate plate-like portion with a holding member that is pressed against the landing portion and pressed between the concrete structure and an anchor bolt attached to the concrete structure. And a fixing member that presses the pressing member at the tip end portions of both side plate portions and press-contacts the fitting portion, and the pressing member is formed in a lip groove shape. On the other hand, a locking projection that protrudes and locks into the groove of the presser member is formed at the tip of the both side plate portions of the fixing member. Place the presser member on the landing By pressing the holding member at the tip of the two side plate portions of the fixing member to which the intermediate plate-like portion is fixed to the anchor bolt, and hitting the two base end portions of the both side plate portions against the concrete structure Regardless of the position of the anchor bolt, it is possible to fix the expansion joint by holding the holding member in place with the load distributed and uniforming the surface pressure, and even when displacement occurs in the concrete structure A uniform fixed state can be maintained by utilizing elastic deformation of both side plate portions of the member. As a result, flexible expansion joints, presser members, and fixing members can be manufactured even before the anchor bolt mounting position is determined, and the construction is easy and can be replaced and repaired in a short time.
Further, since the pressing member is configured in a lip groove shape, the rigidity can be increased and the weight can be reduced as compared with the plate shape.
Further, since the locking protrusions that protrude and lock into the groove of the presser member are formed at the tip ends of the both side plate portions of the fixing member, the lock protrusions are formed in the groove of the presser member. By positioning it, it is possible to hold it down reliably, prevent it from coming off due to the displacement of the concrete structure, and hold it down securely, and expand and contract by minimizing the protruding part of the holding member from the groove of the holding member Interference and damage when the joint is displaced can be prevented.

  According to the fixing structure of the expansion joint for a concrete structure according to claim 2 of the present invention, a storage portion is formed by a step portion facing the joint portion between the concrete structures, and the expansion portion of the flexible expansion joint is formed. Since it can be stored, by storing an expansion joint having a large expansion / contraction allowance in the storage portion, the storage height can be suppressed, the storage width can be reduced, and a compact configuration can be achieved.

  According to the fixing structure of the expansion joint for a concrete structure according to claim 3 of the present invention, a pair of the pressing members can be clamped by flexibility to the adhesive portions at both ends of the flexible expansion joint. Since the projecting edge is formed, the pressing member is sandwiched between the projecting edge formed outside the fixing unit and the projecting edge that also serves as the outside of the expansion / contraction part. Stability can be improved, and a structure that is more resistant to water pressure and the like can be obtained.

  According to the fixing structure of the expansion joint for a concrete structure according to claim 4 of the present invention, since the reinforcing member is fixed and reinforced by the pressing member, even if the pressing member becomes vertical or inverted depending on the mounting position. The expansion can be reinforced by the fixed reinforcing member, the expansion joint can be fixed by applying a large fixing force, and can be fixed uniformly.

  According to the fixing structure of the expansion joint for concrete structures according to claim 5 of the present invention, an upper protrusion margin that can correct the angle even if the anchor bolt that attaches the fixing member to the concrete structure is attached to the inclined hole is secured. Even if an anchor bolt is attached to an inclined hole that prevents interference with a reinforcing bar of a concrete structure, it can be corrected vertically by hitting the protruding part with a hammer etc. Bolt correction work can be performed efficiently, and the necessary tightening force can be ensured with vertical anchor bolts.

  According to the fixing structure of the expansion joint for a concrete structure according to claim 6 of the present invention, the expansion joint of the expansion joint has a substantially W-shaped cross-sectional shape in which the expansion / contraction portion is continuous with the arc portion, and the arc portion is Since it is configured with a large radius of curvature, it can be extended smoothly even when a large displacement is applied, compared to the case where the expandable portion is folded horizontally, and damage to the expandable portion can be prevented. Further, by increasing the curvature of the arc portion, damage at the time of displacement can be reliably suppressed, and the bending strain when the arc portion is reversed at the time of displacement can be prevented from exceeding 100%.

It is a partial expansion perspective view concerning one embodiment of the fixation structure of the expansion joint for concrete structures of this invention. 1 is an overall schematic cross-sectional view according to an embodiment of a fixing structure for an expansion joint for a concrete structure of the present invention. It is explanatory drawing which shows the reinforcement state of the pressing member concerning one Embodiment of the fixation structure of the expansion joint for concrete structures of this invention. It is explanatory drawing of the angle correction state of the anchor bolt concerning one Embodiment of the fixation structure of the expansion joint for concrete structures of this invention. It is explanatory drawing which exaggerates and shows the elastic deformation state of the fixing member concerning one Embodiment of the fixing structure of the expansion joint for concrete structures of this invention. It is the whole schematic cross-sectional view concerning other embodiment of the fixation structure of the expansion joint for concrete structures of this invention. It is a cross-sectional view of the conventional water stop structure. It is a cross-sectional view of the conventional flexible water stop structure.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
In this concrete structure expansion joint fixing structure (hereinafter simply referred to as a fixed structure) 20, for example, as shown in FIG. 2 (FIG. 6), it straddles the joint portion 22 of the existing concrete structures 21, 21. Rubber or synthetic resin that allows water to stop and allows expansion and contraction of wall parts due to uneven settlement of the concrete structures 21 and 21 on both sides of the joint portion 22, earthquake displacement, temperature change, etc. The flexible expansion joint 23 is fixed, and the bolt pitch of the newly installed anchor bolt 24 can be easily accommodated even if there is a deviation to prevent interference with the reinforcing bar. The height and width can be reduced to be compact, the fastening force can be dispersed and fixed uniformly, and when the flexible expansion joint 23 is displaced, it does not interfere with the fixing structure 20, It is that to be able to prevent scratches.

  A flexible expansion joint 23 used in the fixing structure 20 includes an expansion / contraction part 23b meandering in a substantially W shape in which a cross-sectional shape is continuous with an arc part 23a at a middle part in the width direction of a long band, Flat plate-like attachment portions 23c are provided at both ends in the width direction, and are formed of an elastic member such as rubber or synthetic resin. One or more reinforcing layers are embedded as required. When the expansion / contraction part 23b is extended by displacement or the like by using the expansion joint 23 which is continuous at the circular arc part 23a and the intermediate part meanders in the vertical direction as compared with the conventional expansion joint folded in the horizontal direction. Therefore, the expansion of the expansion joint 23 itself can be prevented. Further, by making the radius of curvature of the arc portion 23a of the expansion joint 23 as large as possible, damage at the time of displacement can be reliably suppressed, and the bending strain when the arc portion expands at the time of displacement does not exceed 100%. You can also.

  In this fixed structure 20, the attachment portions 23 c and 23 c of the expansion joint 23 are arranged so as to straddle the joint portions 22 of the concrete structures 21 and 21, but the joint portions 22 of the concrete structures 21 and 21 have a step difference. The portions 21a and 21a are formed in a groove shape facing each other, and serve as a storage portion 25 for storing the expansion / contraction portion 23b of the expansion joint 23. The storage portion 25 can suppress the construction height of the expansion joint 23. Note that the width and depth of the storage portion 25 are determined by the size of the expansion / contraction portion 23 b necessary as the expansion joint 23. Depending on the expansion / contraction allowance of the expansion joint, the storage portion 25 formed in the concrete structures 21 and 21 can be omitted, and an expansion joint may be installed between the flat joint portions 22.

  In the expansion joint 23, a reinforcement cloth such as polyester is laid on the joint portion 22 of the concrete structures 21, 21 as necessary, and the expansion joint 23 is further installed thereon via a water stop material as necessary. A protective cover 26 is provided as necessary so as to cover the entire upper part of the expansion joint 23 up to the attachment portions 23c, 23c, and the protective cover 26 is also provided with a foldable portion 26a that can be expanded and contracted. .

  And in this fixed structure 20, the holding member 27 applied to the attachment part 23c of the expansion joint 23 is used, and it is comprised by the thing of the cross-sectional shape of the substantially U-shaped lip groove type shape which opened upwards, for example, a groove | channel The width is 50 mm, the groove height is 25 mm, the thickness is 2 mm, and the lip width is 10 mm. The cross-sectional shape of the lip groove shape allows the weight to be reduced to 1 / 3.73 while ensuring the same rigidity as compared with a flat plate shape having a width of 50 mm and a thickness of 16.7 mm. .

  If it is necessary to further increase the rigidity, as shown in FIG. 3, for example, a rectangular parallelepiped reinforcing member 27 a or a C-shaped steel having a U-shaped cross section is provided in the groove of the holding member 27. When the presser member 27 is arranged on a vertical wall surface or a ceiling wall surface by fixing it with a bolt nut 27c at a position where it does not interfere with the anchor bolt by interposing a reinforcing member 27b or by welding. It can be reinforced stably without shifting.

  In the fixing structure 20 using such a pressing member 27, the pressing member 27 is not fixed directly to the concrete structures 21 and 21 with the anchor bolt 24, but is fixed via the anchor bolt 24 that is planted outside the expansion joint 23. The member 28 is tightened, and the pressing member 27 is fixed through the fixing member 28.

The fixing member 28 is provided with an intermediate plate-like portion 28a inserted and fixed by an anchor bolt, and an attachment hole 28b for the anchor bolt 14 is formed, and bent so that both sides of the intermediate plate-like portion 28a are bent inward. Both side plate portions 28c and 28c are formed by processing. A presser arm portion 28d for pressing the presser member 27 is formed at the leading end of each of the side plate portions 28c so as to protrude, and the base plate portion of each side plate portion 28c is spaced from the intermediate plate-like portion 28a. An elastic contact portion 28f that protrudes inward so as to form the same surface and contact the concrete structure 21 is integrally formed. In this fixing member 28, the protruding length of the presser arm portion 28 d is substantially the same as the groove width of the presser member 27, and the tip end portion of the presser arm portion 28 d slightly protrudes outside the presser member 27. It is. Thereby, even if the expansion joint 23 is largely displaced, interference and damage can be prevented.
In order to prevent interference and damage when the expansion joint 23 is largely displaced by the tip of the presser arm portion 28d, as shown in FIG. As shown in (b), it is more effective to retract the front end surface of the presser arm portion 28d from the presser member 27. Moreover, you may make it combine retreating by making the upper part of a front end into circular arc shape, and retreat of a front end surface.

The fixing member 28 is formed with a locking protrusion 28e that protrudes into the groove of the pressing member 27 and is locked on the lower surface of the pressing arm portion 28d, and the locking protrusion 28e has a groove width of the pressing member 27. The size is substantially the same as that of the locking projection 28e.
The protrusion amount of the locking protrusion 28e may be such that the presser member 27 does not move due to the displacement of the expansion joint 23.

  Further, in the fixing member 28, when the distance from the lower surface of the intermediate plate portion 28a to the lower surface of the presser arm portion 28d of the both side plate portions 28c (corresponding to the height of the side plate portion) is fastened to the anchor bolt 24, the presser It is set so that the contact pressure required for crimping the attached portion 23c of the expansion joint 23 to the concrete structure 21 via the member 27 can be generated.

Furthermore, in this fixing structure 20, in order to prevent a displacement when the holding member 27 is placed on the fixing portions 23c on both ends of the flexible expansion joint 23 and tightened with the fixing member 28, the fixing portions 23c are prevented. A pair of projecting edge portions 23d and 23d are formed on the base member, and the distance between the pair of projecting edge portions 23d and 23d is substantially the same as or narrower than the width of the presser member 27. It can be clamped. In the fixing structure 10, one of the pair of projecting edge portions 23d and 23d is formed on the outer side of the attaching portion 23c and protrudes upward, and the other is also used as the outer surface of the stretchable portion 23b. .
Thereby, the stability against the force and displacement applied to the expansion joint 23 can be improved by sandwiching the presser member 27 between the pair of projecting edge portions 23d and 23d, or by sandwiching with the elastic force. A structure that is more resistant to water pressure and the like can be obtained.

Next, a construction method of the fixing structure 20 of the present invention in which the expansion joint 23 is installed using such a fixing member 28 will be described.
The expansion joint 23, the presser member 27, and the fixing member 28 are manufactured in advance at the factory, and anchor bolts 24 are planted on the concrete structures 21 and 21 that are outside the attachment portions 23c and 23c of the expansion joint 23 at the construction site. Set up.

In this fixed structure 20, when the anchor bolt 24 is planted, for example, as shown in FIG. 4, it may hit a reinforcing bar inside the concrete structure 21, so the hole depth may not be secured. The tilted hole 29 is formed by tilting the drill, and the anchor bolt 24 is implanted.
Then, after attaching the nut 24a to the anchor bolt 24 attached to the inclined hole 29, the angle of the anchor bolt 24 is corrected by hammering or the like so as to be perpendicular to the surface of the concrete structure 21. The anchor bolt 24 having an upper protrusion margin that can correct the angle is prepared. The upper protrusion margin may be secured, for example, about 25 to 45 mm.
Needless to say, anchor bolts other than the inclined holes 29 may be provided with a normal length, that is, a length that can fasten the fixing member 28.
As the anchor bolt 24, for example, a chemical anchor is used, and a stainless steel M16 bolt is used.
Furthermore, the angle of the anchor bolt attached to the inclined hole can be corrected by pointing the pipe to the anchor bolt and bending it by applying an external force with a jack or the like through the pipe.

After that, first, a reinforcing cloth is laid as necessary so as to straddle the joint portions 22 of the concrete structures 21 and 21, and an expansion joint 23 is disposed thereon via a water stop material as necessary. Is covered with a protective cover 26 as necessary, and the elastic member 23 is installed.
When the step portions 21a and 21a facing the joint portions 22 of the concrete structures 21 and 21 are not formed in a groove shape facing each other, the groove is machined to store the expansion and contraction portion 23b of the expansion joint 23. After forming the part 25, the expansion joint 23 is installed.

  And between the pair of protruding portions 23d, 23d on the flanged portions 23c, 23c of the expansion joint 23, here, the protruding edge portion 23d formed on the outer side of the bonded portion 23c and projecting upward, and the outer surface of the expandable portion 23b The holding member 27 is arranged between the two members, and the fixing member 28 is tightened using the anchor bolt 24 at the positions necessary for temporary fixing such as both ends of the holding member 27 and the expansion joint is connected via the holding member 27. 23 is temporarily fixed.

  In addition, in the connection part in the case of arrange | positioning the pressing member 27 on the bracing part 23c, a clearance (clearance) is not required for position adjustment of a bolt hole like the case where it fixes directly with the anchor bolt until now, and it adheres closely The presser member 27 can be arranged in a state of being pressed, and in particular, the corner portions can be connected and arranged without providing a gap (clearance), whereby the expansion joint 23 is tightened and attached with uniform surface pressure. be able to.

  After temporarily fixing in this way, the anchor bolt 24 is inserted into the mounting hole 28b of the intermediate plate-shaped portion 28a of the fixing member 28 and temporarily fixed with the nut 24a to be able to rotate or move, and then the anchor bolt 24 is centered. The presser arm portion 28d is positioned on the presser member 27 so that the locking projection 18e at the tip end portion of the fixing member 28 is positioned and protrudes in the groove of the presser member 27. The elastic contact portion 28f at the end is brought into contact with the concrete structure 21.

  Thereafter, the fixing member 28 is tightened by tightening the nut 24 a to the anchor bolt 24, and the adhesive portion 23 c of the expansion joint 23 is crimped to the concrete structure 21 via the presser member 27.

  The fixing of the expansion joint 23 is completed by repeating such temporary fixing of the fixing member 28 to the anchor bolt 24, rotation or movement of the fixing member 28, and tightening operation of the fixing member 28.

In the tightening state by the fixing member 28 in the fixing structure 20, the tightening force applied to the intermediate plate-like portion 28a of the fixing member 28 causes the two presser arm portions 28d of the side plate portions 28c and the elastic contact portion 28f to move. It will be distributed and added to a total of two places, and the tightening surface pressure can be made uniform as compared with the case where it is directly fixed with an anchor bolt so far.
Thereby, the bolt pitch of the anchor bolt 24 can also be enlarged, and a man-hour reduction can be aimed at.

  Further, in this fixing structure 20, both side plate portions 28c of the fixing member 28 are elastically deformed so as to spread outward as shown in FIG. 5 and the elastic contact portions 28f are elastically deformed by the tightening force. Since both sides of the pressing member 27 are elastically deformed and fixed by the tightening force, even if the concrete structure 21 is displaced, the tightening surface pressure is reduced by the spring effect due to these elastic deformations. It can be reduced and the fixed state can be maintained.

  Further, in this fixing structure 20, the anchor bolt 24 is tightened only by the thickness of the intermediate plate-like portion of the fixing member 28 as compared with the case where the attachment portion 23 c of the expansion joint 23 is directly fixed by the anchor bolt. The tightening height can be lowered by the thickness of the joint 23, and the influence on the internal space of the concrete structure 21 can be suppressed.

  Further, the retaining protrusion 28e of the holding arm 28d of the fixing member 28 makes it difficult for the holding arm 28d of the fixing member 28 to come off even if the concrete structure 21 is displaced, thereby increasing the prevention effect. .

  According to such a fixing structure 20, it is necessary to measure the bolt pitch after the position of the anchor bolt so far is determined, and to drill holes such as a flexible expansion joint, a holding member, and a protective cover based on the bolt pitch. The flexible expansion joint 23, the pressing member 27, and the fixing member 28 can be manufactured in parallel with the installation of the anchor bolt 24, and the construction of the fixing structure 20 can be completed in a short time. Further, the distal end of the fixing member 28 can be prevented from protruding from the pressing member 27 as much as possible, or can be in a retracted state, and interference and damage when the expansion joint 23 is displaced can be prevented.

Further, according to the fixing structure 20, since the pressing member 27 is configured in a lip groove shape, the rigidity can be increased and the weight can be reduced as compared with the plate shape.
Further, since the locking protrusions 28e that protrude into the grooves of the presser member 27 and are locked are formed at the tip ends of the side plates 28c, 28c of the fixing member 28, the lock protrusions 28e are formed on the presser member. By being positioned in the groove 17, it can be surely pressed, and it can be surely pressed by preventing it from coming off due to the displacement of the concrete structures 21, 21.

  Moreover, according to this fixed structure 20, the accommodating part 25 by the level | step-difference parts 21a and 21a facing the joint part 22 between the concrete structures 21 and 21 is formed, and the expansion-contraction part 23b of the flexible expansion joint 23 is accommodated. Since the expansion joint 23 having a large expansion / contraction allowance is stored in the storage unit 25, the storage height can be suppressed, the storage width can be reduced, and the fixing structure 20 is configured in a compact manner. be able to.

  Furthermore, according to this fixing structure 20, since the pair of projecting edge portions 23d capable of clamping the pressing member 27 by flexibility are formed on the attachment portions 23c, 23c of both ends of the flexible expansion joint 23. The force or displacement applied to the expansion joint 23 by sandwiching the presser member 27 between the protruding edge 23d formed on the outer side of the attachment portion 23c and the protruding edge 23d that also serves as the outer side of the expansion / contraction part 23b. It is possible to improve the stability against water pressure and to make the structure more resistant to water pressure.

  Further, according to the fixing structure 20, since the reinforcing members 27a and 27b are fixed and provided to the holding member 27, the reinforcing members 27a and 27b are fixed even if the holding member 27 is vertical or inverted depending on the mounting position. The expansion joint 23 can be fixed by applying a large fixing force and can be fixed uniformly.

  Furthermore, according to the fixing structure 20, since the anchor bolt 24 for attaching the fixing member 28 to the concrete structures 21 and 21 is secured to the upper protrusion allowance for angle correction even if the anchor bolt 24 is attached to the inclined hole 29, the concrete structure 21 Even if the anchor bolt 24 is attached to the inclined inclined hole 29 by preventing interference with the reinforcing bars of the steel bar, the nut 24a can be attached to the protruding portion and hit with a hammer or the like to be corrected vertically. Can be efficiently performed, and a necessary tightening force can be secured by the vertical anchor bolt 24.

  Moreover, according to this fixed structure 20, since the expansion-contraction part 23b of the expansion joint 23 was comprised as the substantially W-shaped cross-sectional shape which followed the circular arc part 23a, when extending | stretching the expansion-contraction part 23b horizontally In comparison with the above, even when a large displacement is applied, it can be extended smoothly, and damage to the expansion / contraction part 23b can also be prevented. Furthermore, by making the radius of curvature of the arc portion as large as possible, damage at the time of displacement can be reliably suppressed, and the bending strain when the arc portion expands at the time of displacement can be prevented from exceeding 100%. .

In the above-described embodiment, the flexible expansion joint has been described as an example of a substantially W-shaped cross-sectional shape that is continuous with five arc portions as an expansion / contraction portion in the middle portion, but is not limited thereto. For example, as shown in FIG. 6, a flexible expansion joint having another shape such as a substantially W-shaped cross-sectional shape in which the expansion / contraction portion is continuous by three arc portions can be used.
In addition, the configuration other than the expansion joint of this embodiment is the same as that already described except that the storage portion is flat, and has the same actions and effects. The description is omitted.
Further, the configuration of the fixing member is not limited to that described in the above embodiment, and any configuration having the same function can be used.

20 Fixed structure of expansion joint for concrete structures (fixed structure)
21 Concrete structure 22 Joint portion 23 Flexible expansion joint 23a Arc portion 23b Stretch portion 23c Fitting portion 23d Projection edge portion 24 Anchor bolt 24a Nut 25 Storage portion 26 Protective cover 26a Folding portion 27 Press member 27a Reinforcement member 27b Reinforcement Member 27c Bolt nut 28 Fixing member 28a Intermediate plate portion 28b Mounting hole 28c Both side plate portion 28d Presser arm portion 28e Locking projection portion 28f Elastic contact portion 29 Inclined hole

Claims (6)

A flexible expansion joint placed across the joint between the concrete structures;
A presser member that is pressed against the adhesive portions at both ends of the expansion joint so as to be sandwiched between the concrete structures;
The intermediate plate-shaped portion is fixed by anchor bolts attached to the concrete structure, and the base end portions of the both-side plate portions formed on both sides of the intermediate plate-shaped portion are applied to the concrete structure, and the distal end portions of the both-side plate portions And a fixing member that presses the presser member and press-contacts the attachment portion.
While the presser member is configured in a lip groove shape, a locking protrusion that protrudes and locks into the groove of the presser member is formed at the front end of both side plate portions of the fixing member. Fixed structure for expansion joints for concrete structures.   2. The expansion joint for a concrete structure according to claim 1, wherein a storage portion is formed by a step portion facing the joint portion between the concrete structures so that the expansion portion of the flexible expansion joint can be stored. Fixed structure.   The concrete according to claim 1 or 2, wherein a pair of projecting edge portions capable of clamping the pressing member by flexibility are formed on the adhesive portions at both ends of the flexible expansion joint. Fixed structure for expansion joints for structures.   The fixing structure of the expansion joint for concrete structures according to any one of claims 1 to 3, wherein a reinforcing member is fixedly provided on the holding member and reinforced.   The anchor bolt for attaching the fixing member to the concrete structure is provided with an upper protrusion margin that can be angle-corrected even if attached to an inclined hole. Fixed structure for expansion joints for concrete structures.   2. The expansion joint of the expansion joint has a substantially W-shaped cross-sectional shape that is continuous with an arc portion, and the radius of curvature of the arc portion that becomes the inner side at the time of displacement is increased. The fixation structure of the expansion joint for concrete structures in any one of -5.

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