JP5876796B2 - Fixing jig for joint forming member - Google Patents

Description

The present invention relates to solid Teiji tool joint forming member for forming a joint in a concrete structure.

  Generally, in concrete structures, it is inevitable that cracks will occur due to the effects of heat shrinkage, etc. Therefore, by forming joints in the concrete structures and concentrating the cracks on these joints, the effects of cracks can be suppressed as much as possible. Has been done.

  There are various methods for forming joints in a concrete structure. For example, in Patent Document 1, as a method for forming joints on a vertical surface of a concrete structure, a rod-shaped joint forming member extending in the vertical direction is used as an inner surface of a mold material. The concrete is placed in the space defined by the formwork material. After the concrete is solidified, joints extending in the vertical direction are formed by the joint forming member.

JP 2010-133113 A

  When forming joints on the vertical surface of the concrete structure, the joint forming member may be fixed to the formwork material as in Patent Document 1 above, but the joints must also be formed on the upper surface of the concrete structure. It may be necessary. Since the joint forming member for the upper surface cannot be fixed before placing concrete, a method for temporarily fixing the joint forming member horizontally by pressing it onto the concrete when placing concrete, or a surface for temporary installation A method of temporarily fixing to a predetermined location using a tree or the like may be performed.

  However, when the joint forming member is pressed into the concrete at the time of placing the concrete, since the concrete is still in a fluidized state, it is difficult to align the joint forming member and to provide it with high accuracy. In addition, when using face wood or the like, the face wood has to be processed according to the shape and dimensions of the concrete structure, which requires a lot of labor.

  The present invention has been made in view of the above points, and an object of the present invention is to enable easy and accurate formation when forming joints on the upper surface of a concrete structure. .

  In order to achieve the above object, in the present invention, the joint forming member is fixed to the reinforcing bar by a fixing jig, and the position can be adjusted by the fixing jig.

A first invention is a fixing jig for fixing a joint forming member for forming joints on an upper surface of a concrete structure to a reinforcing bar,
A reinforcing bar fixing portion fixed to the reinforcing bar of the concrete structure ;
A joint forming member attaching portion to which the joint forming member is attached;
Provided between the reinforcing bar fixing part and the joint forming member attaching part, and an adjusting part for adjusting the position of the joint forming member attaching part with respect to the reinforcing bar fixing part ,
The reinforcing bar fixing portion includes a first member and a second member that sandwich a reinforcing bar extending in the horizontal direction in the radial direction, and is configured to be capable of adjusting the position of the second member with respect to the first member,
The adjusting portion is configured to be able to adjust the height of the joint forming member attaching portion,
The joint forming member mounting portion includes a placement portion on which the joint formation member is placed, and a caulking portion for caulking and fixing the joint formation member placed on the placement portion. It is a feature.

According to this arrangement, the reinforcing bars fixed portion fixed to the reinforcing bar, by attaching the joint member to the joint forming member mounting portion, so that the joint member is secured to the reinforcing bar through the fixing jig. And the position adjustment of a joint formation member can be performed by an adjustment part. By using the fixing jig, it is not necessary to process according to the shape and size of the concrete structure as in the case of using a conventional facewood, and it becomes possible to fix the joint forming member with less effort.

  When the placed concrete is cured, a concrete structure in which joints are formed at desired positions on the upper surface by the joint forming member is obtained.

Moreover, co-when disposed inside the crack inducing joint material Nkurito structure, it becomes easy to align the position of the joint forming member and the crack inducing joint fillers, can be reliably generated cracks in the desired site become.

Further , the reinforcing bar fixing portion is fixed to the reinforcing bar by sandwiching the reinforcing bar between the first member and the second member. By adjusting the position of the 2nd member with respect to the 1st member, since it becomes possible to fix a reinforcing bar fixing part to the reinforcing bar from which a diameter differs, the versatility of a fixing jig increases.

In addition , the height of the joint forming member can be adjusted regardless of the position of the reinforcing bar.

Moreover , when attaching a joint formation member, after mounting a joint formation member in a mounting part, it becomes possible to attach easily by crimping a caulking part.

According to the first invention, since the solid Teiji tool is a a adjustment portion reinforcing bar fixing portion and the joint forming member mounting portion, easily on the upper surface of the concrete structure, and can be formed with high precision joints. Further, when the crack-inducing joint material is disposed inside, the crack can be reliably generated at a desired site.

In addition , since the distance between the first member and the second member that sandwich the reinforcing bar in the radial direction can be adjusted, the reinforcing bar fixing portion can be fixed to the reinforcing bar having a different diameter, and the versatility of the fixing jig can be improved. Can do.

Moreover , the height of the joint forming member can be adjusted so as to match the position of the upper surface of the concrete structure regardless of the position of the reinforcing bar.

Moreover , since the mounting portion on which the joint forming member is placed and the caulking portion for caulking and fixing the joint forming member placed on the placing portion are provided, the joint forming member can be easily attached to the fixing jig. It can be attached to the work and workability can be improved.

It is a perspective view of the concrete structure in which the joint was formed. It is a perspective view which shows the positional relationship of a reinforcing bar and a fixing jig. It is a front view which shows the fixing jig of the state attached to the reinforcing bar. It is a side view which shows the fixing jig of the state attached to the reinforcing bar. It is a front view of the concrete structure with which the gradient was set on the upper surface. FIG. 4 is a view corresponding to FIG. 3 showing a fixing jig provided at the center in the width direction of the concrete structure. FIG. 4 is a view corresponding to FIG. 3 when a crack-inducing joint material is provided. FIG. 5 is a view corresponding to FIG. 4 when a crack-inducing joint material is provided. FIG. 4 is a view corresponding to FIG. 3 in a state where joint forming members having different shapes are fixed. FIG. 6 is a view corresponding to FIG. 3 and showing a first modification of the embodiment. It is a figure which shows the variation of a joint formation member. FIG. 10 is a view corresponding to FIG. 3 and showing a second modification of the embodiment. FIG. 9 is a view corresponding to FIG. 3 and showing a third modification of the embodiment. FIG. 9 is a view corresponding to FIG. 4 and showing a fourth modification of the embodiment. It is a figure which shows the variation of the joint formation member which fixed the water stop material.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

Figure 1 shows a concrete structure 100 forming the joint A using solid Teiji tool according joint forming member to an embodiment of the present invention. The concrete structure 100 is used when, for example, a water channel or a passage is constructed. Specifically, the concrete structure 100 includes a bottom wall portion 101, side wall portions 102 and 102 extending upward from both sides in the width direction of the bottom wall portion 101, and an upper wall portion 103, and has a vertical cross section. It is formed in a substantially rectangular square tube shape. Further, as shown in FIG. 2, reinforcing bars 110 and 111 are disposed inside the wall portions 101 to 103 of the concrete structure 100. The reinforcing bar 110 is formed in a U-shape that opens downward from one side wall portion 102 of the concrete structure 100 to the upper wall portion 103 and the other side wall portion 102. On the other hand, the reinforcing bar 111 extends in the longitudinal direction of the concrete structure 100.

  The joint A is continuously formed on the upper surface of the upper wall portion 103 of the concrete structure 100 and the outer surface of the side wall portion 102 as shown in FIG. 1, and the joint forming member 10 is embedded at the time of placing concrete, It is formed by solidifying concrete. The joint A of the side wall portion 102 can be formed by, for example, fixing a joint forming member (both not shown) to a mold material and placing concrete in a space defined by the mold material. It is. On the other hand, the joint A of the upper wall portion 103 is formed by the joint forming member 1 fixed to the reinforcing bar 111 via the fixing jig 20 shown in FIGS.

  The structure of the joint forming member 1 will be described with reference to FIG. 3. The joint forming member 1 includes a rod-like portion 2 having a substantially rectangular closed cross section and a pair of plate-like leg portions 3 protruding downward from the lower surface of the rod-like portion 2. , 3 and is an integrally molded product made of a resin material. The leg portions 3 and 3 are continuous over both ends of the rod-like portion 2 in the longitudinal direction. Further, the leg portions 3 and 3 are inclined so as to be separated from each other as they go downward. The lower end portions of the leg portions 3 and 3 are formed thick and have a circular cross section.

  The fixing jig 20 adjusts the position of the reinforcing bar fixing part 21 fixed to the reinforcing bar 111, the joint forming member attaching part 22 to which the joint forming member 1 is attached, and the joint forming member attaching part 22 with respect to the reinforcing bar fixing part 21. The adjustment unit 23 is provided. The adjusting portion 23 includes a screw rod 26 having a thread groove formed continuously on the outer peripheral surface, and a first nut 27 and a second nut 28 that are screwed into the screw rod 26. The screw rod 26 extends in the vertical direction.

  As shown in FIG. 4, the reinforcing bar fixing portion 21 is configured to be fixed to the reinforcing bar 111 by sandwiching the reinforcing bar 111 in the radial direction, and protrudes from the screw rod 26 in the radial direction of the screw rod 26. Is provided. The reinforcing bar fixing portion 21 includes a plate member (first member) 30 formed so as to be in contact with the reinforcing bar 111, an adjustment bolt (second member) 31 that is in contact with the reinforcing bar 111 from the radial direction, and a nut 32 into which the adjustment bolt 31 is screwed. And.

  The plate member 30 includes a fixed plate portion 30a fixed to the adjustment portion 23, a bent plate portion 30b formed by bending, and a nut mounting plate portion 30c to which the nut 32 is attached. The base end side of the fixed plate portion 30a extends in a direction orthogonal to the axial direction of the screw rod 26, and an insertion hole 30f through which the screw rod 26 is inserted is formed. The insertion hole 30f is a long long hole. The longitudinal direction of the insertion hole 30f is a radial direction of the screw rod 36 and a direction orthogonal to the longitudinal direction of the joint forming member 1 in the attached state. As shown in FIG. 3, the fixed plate portion 30 a is bent in a side view, and the distal end side of the fixed plate portion 30 a extends substantially parallel to the axial direction of the screw rod 26 and then orthogonal to the axial direction of the screw rod 26. It is bent in the direction of

  The bent plate portion 30b and the nut mounting plate portion 30c are integrally formed so as to protrude upward on the distal end side of the fixed plate portion 30a. The bent plate portion 30b and the nut attaching plate portion 30c are opposed to each other, and the reinforcing bar 111 can be inserted between the bent plate portion 30b and the nut attaching plate portion 30c. The interval between the bent plate portion 30b and the nut mounting plate portion 30c is set to be wide so that the thickest of the commonly used reinforcing bars 111 can be inserted.

  The bent plate portion 30b is bent in a substantially V shape that opens to the nut mounting plate portion 30c side so that the reinforcing bar 111 is fitted. The nut mounting plate portion 30 c extends in the axial direction of the screw rod 26. A bolt insertion hole 30e through which the adjustment bolt 31 is inserted is formed in the nut mounting plate portion 30c. The nut 32 is attached to the surface of the nut attachment plate 30c opposite to the bent plate 30b. The center hole of the nut 32 and the bolt insertion hole 30e coincide.

  The adjustment bolt 31 is screwed into the nut 32 from the side opposite to the bent plate portion 30b, and is inserted through the bolt insertion hole 30e of the nut mounting plate portion 30c. By tightening the adjustment bolt 31, the tip of the adjustment bolt 31 and the bent plate portion 30b approach each other, and by loosening the adjustment bolt 31, the tip of the adjustment bolt 31 moves away from the bent plate portion 30b.

  The fixed plate portion 30 a of the plate material 30 is sandwiched between the first nut 27 and the second nut 28. By rotating the first nut 27 and the second nut 28, the position of the screw rod 26 with respect to the fixed plate portion 30a can be changed in the vertical direction.

  A joint forming member attachment portion 22 is provided at the upper end portion of the screw rod 26. The joint forming member mounting portion 22 includes a protruding plate portion 35 protruding from the upper end portion of the screw rod 26 in the radial direction of the screw rod 26 and extending substantially horizontally, and a caulking plate fixed to the upper surface of the protruding plate portion 35 on the front end side. Part 36. The protruding direction of the protruding plate part 35 is opposite to the reinforcing bar fixing part 21. The caulking plate portion 36 extends substantially horizontally, and includes a placement portion 36a on which the joint forming member 1 is placed, and a pair of caulking portions 36b and 36b provided on both side edges of the placement portion 36a. Yes. The lower end portions of the leg portions 3 and 3 of the joint forming member 1 are placed on the placement portion 36a. The caulking portions 36b and 36b are for caulking and fixing the joint forming member 1 placed on the placement portion 36a. The shape before caulking of the caulking portions 36b and 36b is such that the legs 3 and 3 of the joint forming member 1 can be inserted between the caulking portions 36b and 36b from above as indicated by phantom lines. The joint forming member 1 can be caulked and fixed by bending the caulking parts 36b and 36b toward the side closer to the legs 3 and 3 of the joint forming member 1.

  Next, a method for fixing the joint forming member 1 using the fixing jig 20 configured as described above will be described. As shown in FIG. 5, a gradient may be provided on the upper surface of the concrete structure 100. In this case, since the internal reinforcing bars 110 and 111 are arranged substantially horizontally, the vertical separation distance between the upper surface of the concrete structure 100 and the reinforcing bars 110 and 111 approaches the central portion in the width direction of the concrete structure 100. It gets longer.

  When the bar arrangement of the reinforcing bars 110 and 111 is completed, the fixing jig 20 is fixed to the reinforcing bar 111. In this embodiment, as shown in FIG. 2, three fixing jigs 20 (both ends and central part) are fixed in the width direction of the concrete structure 100. However, the number and positions of the fixing jigs 20 are as follows. It is not limited to this.

  When the fixing jig 20 is fixed, the adjustment bolt 31 of the reinforcing bar fixing portion 21 is loosened in advance, and the distance between the tip of the adjustment bolt 31 and the bent plate portion 30b is set wide. Then, the fixing jig 20 is moved between the adjusting bolt 31 and the bent plate portion 30b so that the reinforcing bars 111 are inserted from above them. The adjustment bolt 31 is tightened after the reinforcing bar 111 is disposed inside the bent plate portion 30b. Then, the tip of the adjustment bolt 31 approaches the reinforcing bar 111 and eventually comes into contact with the reinforcing bar 111. As a result, the bent plate portion 30b and the adjustment bolt 31 sandwich the reinforcing bar 111 in the radial direction, and the reinforcing bar fixing portion 21 is fixed to the reinforcing bar 111. Since the adjustment bolt 31 is fastened to the reinforcing bar 111 in this way, even if the diameter of the reinforcing bar 111 is different, it is adjusted by the tightening amount of the adjusting bolt 31 so that the reinforcing bar fixing portion 21 has various diameters. Can be fixed to.

  Thereafter, the leg portions 3 and 3 of the joint forming member 1 are placed on the placement portion 36 a of the joint forming member attaching portion 22. Next, the caulking portions 36b and 36b are bent until they approach the leg portions 3 and 3 of the joint forming member 1 placed on the placement portion 36a. Thereby, the joint forming member 1 is attached to the joint forming member attaching portion 22.

  The position adjustment of the joint forming member 1 can be performed by rotating the first nut 27 and the second nut 28, and may be performed in a state where the joint forming member 1 is attached to the joint forming member attaching portion 22. It may be done before installation. That is, when the first nut 27 and the second nut 28 are rotated in the direction in which the first nut 27 and the second nut 28 move upward, the joint forming member 1 can be moved upward, while the first nut When the first nut 27 and the second nut 28 are rotated in the direction in which the 27 and the second nut 28 move downward, the joint forming member 1 can be moved downward. The adjustment range of the joint forming member 1 can be set according to the length of the screw rod 26, and is set to be a sufficiently wide range.

  Further, in the state where the first nut 27 is loosened, the screw rod 36 can be moved in the longitudinal direction of the insertion hole 30 f of the plate member 30. By tightening the first nut 27 and the second nut 28 when the screw rod 36 comes to an arbitrary position in the longitudinal direction of the insertion hole 30f, the screw rod 36 can be fixed to the plate portion 30 at that position. Therefore, the horizontal position adjustment of the joint forming member mounting portion 22 can also be performed.

  3 and 4 show fixing jigs 20 provided at both ends of the concrete structure 100 in the width direction. On the other hand, FIG. 6 shows the fixing jig 20 provided at the center in the width direction of the concrete structure 100. Since the above-described gradient is provided on the upper surface of the concrete structure 100, it is necessary to make the joint forming member 1 higher in the central portion in the width direction than at both ends. Correspondingly, in the fixing jig 20 (FIG. 6) provided in the center portion in the width direction of the concrete structure 100, the joint forming member mounting portion 22 is compared with the fixing jig 20 (FIG. 3) provided at both ends. The height of is increased.

  In this manner, the joint forming member 1 can be fixed to the reinforcing bar 111 via the fixing jig 20, and the position adjustment of the joint forming member 1 can be performed with the fixing jig 20. Accordingly, it is possible to accurately fix the joint forming member 1 at a target position before placing concrete. In addition, since the position-adjustable fixing jig 20 is used, it is not necessary to perform processing according to the dimensions of the concrete structure 100 as in the case of using a conventional facewood, and the joint forming member 1 can be fixed with little effort. It becomes possible to do.

  When the concrete is placed and the placed concrete is cured, the joint forming member 1 is embedded in the concrete structure 100, and the joint A is formed at a desired position on the upper surface of the concrete structure 100 by the joint forming member 1. .

  Since the joint forming member 1 can be accurately fixed at a target position, the joint forming member 1 can be used as a mark on the top when placing concrete. This makes it easy to finish the top of the concrete.

  As described above, according to the embodiment of the present invention, the joint forming member 1 for forming the joint A on the upper surface of the concrete structure 100 is connected to the reinforcing bar 111 of the concrete structure 100 via the fixing jig 20. While fixing, the position of the joint forming member 1 is adjusted by the fixing jig 20, so that the joint A can be easily and accurately formed on the upper surface of the concrete structure 100.

  Further, since the reinforcing bar 111 is sandwiched between the bent plate part 30b and the adjusting bolt 31, the reinforcing bar fixing part 21 is fixed to the reinforcing bar 111, so that the reinforcing bar fixing part 21 can be fixed to the reinforcing bar 111 having a different diameter. . Thereby, the versatility of the fixing jig 20 can be improved.

  Moreover, when attaching the joint formation member 1, after installing the joint formation member 1 in the mounting part 36a, it can attach easily by crimping the crimping parts 36b and 36b, and can make construction workability favorable.

  As shown in FIGS. 7 and 8, the fixing jig 20 according to the present embodiment can also be used when a crack-inducing joint material 50 is disposed inside the concrete structure 100. The crack-inducing joint material 50 is for inducing a crack in the concrete structure 100 by forming a cross-sectional defect portion inside the concrete structure 100, and is not described in detail because it is a well-known one. The crack-inducing joint material 50 can be fixed to the reinforcing bar 111 using, for example, a wire. In this embodiment, since the joint forming member 1 is fixed by the fixing jig 20, the position of the joint forming member 1 becomes accurate, and the alignment with the crack-inducing joint material 50 can be performed accurately. . Thereby, it becomes possible to generate a crack reliably in a desired part.

  Further, the shape and structure of the concrete structure portion are not limited to those described above, and the present invention can be applied to any concrete structure that forms joints on the upper surface.

  Further, the shape of the joint forming member 1 is not limited to the above-described shape. For example, as shown in FIG. 9, the joint forming member 1 having a trapezoidal cross section can be fixed to the fixing jig 20. In this case, after the joint forming member 1 is arranged so that the short side of the trapezoid is located below, it is fixed by caulking. Moreover, the material of the joint forming member 1 may be wood other than the resin.

  In addition, as in Modification 1 shown in FIG. 10, the rectangular hollow joint forming member 1 having a long cross section can be fixed to the fixing jig 20. In this case, the shape of the joint forming member mounting portion 22 can be made to match the joint forming member 1. The material of the joint forming member attachment portion 22 may be, for example, a galvanized steel plate, stainless steel, iron, or the like, and is not particularly limited.

  Further, the joint forming member 1 fixed to the fixing jig 20 can be exemplified in various shapes as shown in FIG. The joint forming member 1 shown in FIG. 11A has a rectangular shape with a long cross section, and the joint forming member 1 shown in FIG. 11B has a triangular cross section, and the joint forming shown in FIG. The member 1 is provided with a substantially horizontal plate-like portion at the upper portion and a pair of leg portions 3 and 3 at the lower portion. In addition to these, the joint forming member 1 having various shapes can be fixed to the fixing jig 20, and the shape of the joint forming member attaching portion 22 may be changed to match the shape of the joint forming member 1.

  Further, the fixing position of the joint forming member mounting portion 22 with respect to the screw rod 26 is not limited to the above-described position. For example, as in Modification 2 shown in FIG. It may be arranged so as to be substantially coincident with the upper end of 26.

  Moreover, in the said embodiment, although the height adjustment of the joint formation member 1 is performed using the screw rod 26, it is not restricted to this, For example, like modification 3 shown in FIG. The height of the joint forming member 1 may be adjusted using a bar 58 in which a plurality of convex portions 58a, 58a,... Are formed at predetermined intervals in the longitudinal direction. In this case, the binding wire 60 is wound between the convex portion 58a and the convex portion 58a of the bar member 58, and the binding wire 60 is also wound around the plate member 30 so that the plate member 30 can be fixed at a predetermined height.

  Further, the shape of the bent plate portion 30b of the plate member 30 may be a shape curved in an arc shape, for example, as in Modification 4 shown in FIG. In this case, it is preferable that the curvature of the bent plate portion 30 b is larger than the curvature of the reinforcing bar 111.

  Moreover, as the joint formation member 1 fixed to the fixing jig 20, as shown in FIG. 15, the water stop material 61 for securing the water stop between concrete and the joint formation member 1 was fixed. May be. FIG. 15A shows a structure in which a water stop material 61 is fixed to the leg portions 3 and 3 in the joint forming member 1 of the above embodiment. FIG. 15 (b) shows a watertight material 61 fixed to the outer surface of the joint forming member 1 having a rectangular cross section. FIG. 15 (c) shows a watertight material 61 fixed to the outer surface of the joint-forming member 1 having a trapezoidal cross section. FIG. 15 (d) shows a structure in which a water stop material 61 is fixed to the outer surface of the joint forming member 1 having a triangular cross section. FIG. 15 (e) shows a structure in which a water blocking material 61 is fixed to the outer surface of the hollow joint forming member 1 having a rectangular cross section. FIG. 15 (f) shows a joint forming member 1 having a pair of legs 3, 3 with a water stop material 61 fixed to the outer surface of the legs 3, 3. The water blocking material 61 may be provided only in the contact portion with the concrete in the joint forming member 1.

As described above, the solid Teiji tool according joint member in the present invention can be used when forming a joint, for example a concrete structure.

DESCRIPTION OF SYMBOLS 1 Joint formation member 20 Fixing jig 21 Reinforcing bar fixation part 22 Joint formation member attachment part 23 Adjustment part 26 Screw rod 27 First nut 28 Second nut 30 Plate material (first member)
31 Adjustment bolt (second member)
36a Placement part 36b Caulking part 100 Concrete structure 110 Reinforcing bar 111 Reinforcing bar

Claims (1)

A fixing jig for fixing a joint forming member for forming joints on the upper surface of the concrete structure to the reinforcing bar,
A reinforcing bar fixing portion fixed to the reinforcing bar of the concrete structure ;
A joint forming member attaching portion to which the joint forming member is attached;
Provided between the reinforcing bar fixing part and the joint forming member attaching part, and an adjusting part for adjusting the position of the joint forming member attaching part with respect to the reinforcing bar fixing part ,
The reinforcing bar fixing portion includes a first member and a second member that sandwich a reinforcing bar extending in the horizontal direction in the radial direction, and is configured to be capable of adjusting the position of the second member with respect to the first member,
The adjusting portion is configured to be able to adjust the height of the joint forming member attaching portion,
The joint forming member mounting portion includes a placement portion on which the joint formation member is placed, and a caulking portion for caulking and fixing the joint formation member placed on the placement portion. A fixing jig for a joint forming member as a feature.

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