Main reinforcement spacing retainer

Abstract

To provide a main reinforcement spacing holder that can easily maintain the spacing between main reinforcement bars in a column. [Solution] A main reinforcement spacing holder for maintaining the spacing between main reinforcement bars of a column, comprising: a holder body extending in one direction, which is attached to the main reinforcement bars of a plurality of main reinforcement bars arranged in parallel in a straight line so as to intersect with the axial direction of the main reinforcement bars; and a plurality of spacer members attached to the holder body for maintaining the spacing between the main reinforcement bars, wherein the holder body has the plurality of spacer members slidably attached along the longitudinal direction of the holder body.

Description

Technical Field

[0001] The present invention relates to a main reinforcement spacing retainer for maintaining the gap between main reinforcements of columns.

Background Art

[0002] In column members such as reinforced concrete structures, it is necessary to ensure the gap between main reinforcements of columns is the dimension specified by the design dimensions. Conventionally, a concrete block was sandwiched between the main reinforcements of columns to ensure the gap between the main reinforcements, but the block might come off due to vibration during concrete placement or the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The technology according to the present disclosure has been made in view of the above problems, and its object is to provide a main reinforcement spacing retainer that can easily maintain the gap between main reinforcements of columns.

Means for Solving the Problems

[0005] The technology according to the present disclosure is a main reinforcement spacing retainer for maintaining the gap between main reinforcements of columns before concrete placement, a retainer body extending in one direction, which is attached to the main reinforcements of columns so as to intersect the axial direction of a plurality of main reinforcements arranged in parallel in a straight line, a plurality of spacer members attached to the retainer body for maintaining the gap between the main reinforcements of columns, and includes <o000034>The holder body has a plurality of spacer members mounted so as to be slidable along the longitudinal direction of the holder body.

[0006] Here, the spacer member may have a width dimension corresponding to the design dimension of the spacing between the main reinforcement bars of the column.

[0007] Furthermore, the holder body may include a first member and a second member used in combination, and when the first member and the second member are combined, the first guide surface of the first member and the second guide surface of the second member are positioned opposite each other with a gap between them, so that a plurality of the spacer members can be slidably mounted along the longitudinal direction of the holder body.

[0008] Furthermore, the spacer member may have a Z-shape in side view and include a sliding portion inserted between the first guide surface and the second guide surface, a spacer portion that bends in a first direction from one end of the sliding portion in the height direction, and a retaining portion that bends in a second direction opposite to the first direction from the other end of the sliding portion in the height direction. [Effects of the Invention]

[0009] According to the present invention, a main reinforcement spacing holder can be provided that can easily maintain the spacing between main reinforcement bars of a column. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a top view of the main reinforcement spacing holder. [Figure 2] Figure 2 is an exploded view of the main reinforcement spacing holder. [Figure 3] Figure 3 is a view taken along arrow A in Figure 2. [Figure 4] Figure 4 is a view taken along arrow B in Figure 2. [Figure 5] Figure 5 is a view taken along arrow C in Figure 2. [Figure 6] Figure 6 shows a cross-sectional view of the main reinforcement spacing retainer shown in Figure 1. [Figure 7] Figure 7 shows the DD cross-section of the main reinforcement spacing holder shown in Figure 1. [Figure 8] Figure 8 shows the main reinforcement bars of a column with the main reinforcement spacing holders attached. [Figure 9] Figure 9 illustrates an example of the arrangement of the main reinforcement spacing retainers as viewed from direction E in Figure 8. [Figure 10] Figure 10 is a diagram illustrating a modified spacer member. [Modes for carrying out the invention]

[0011] The main reinforcement spacing retainer related to this disclosure will be described below with reference to the drawings.

[0012] <Embodiment> Figure 1 is a top view of the main reinforcement spacing holder 1. The main reinforcement spacing holder 1 is a tool used to maintain the spacing between the main reinforcement bars of a column before concrete is poured. The main reinforcement spacing holder 1 consists of a holder body 2 and a plurality of spacer members 5 attached to the holder body 2. The holder body 2 and spacer members 5 in the main reinforcement spacing holder 1 are made of, for example, steel. The column main reinforcement refers to, for example, structural reinforcement bars that extend in the direction of the column axis for constructing a column member in a reinforced concrete structure.

[0013] The holding body 2 is configured as a frame member extending in one direction, and includes a first member 3 and a second member 4 that are used in combination. Hereinafter, the longitudinal direction of the holding body 2 is referred to as the "width direction". In FIG. 1 , a part of the column main bars 10 in the column member to be constructed is shown by a broken line. As shown in FIG. 1 , the main bar spacing holder 1 (holding body 2) is attached to the column main bars 10 so as to intersect a plurality of column main bars 10 arranged in a straight line in parallel. The reference symbol C1 shown in FIG. 1 is a central axis extending in the axial direction of the column main bar 10. The reference symbol D1 is the horizontal arrangement direction in which a plurality of column main bars 10 are arranged in parallel. The main bar spacing holder 1 (holding body 2) is attached to the column main bars 10 so as to extend along the horizontal arrangement direction of the plurality of column main bars 10. Further, the main bar spacing holder 1 (holding body 2) is attached to the column main bars 10 so as to extend in the horizontal direction in a posture orthogonal to the axial direction in which the central axis C1 of the column main bar 10 extends, for example.

[0014] FIG. 2 is an exploded view of the main bar spacing holder 1. Similar to FIG. 1 , FIG. 2 shows a top view of the first member 3, the second member 4, and the spacer member 5 that constitute the main bar spacing holder 1. FIG. 3 is a view taken in the direction of arrow A in FIG. 2. FIG. 4 is a view taken in the direction of arrow B in FIG. 2. FIG. 3 shows the side surface of the first member 3, and FIG. 4 shows the side surface of the second member 4. As shown in FIG. 2, the first member 3 and the second member 4 are members having a rail form extending in one direction, and are integrally assembled by a fastener 6 including, for example, a bolt (screw) 61 and a nut 62. Hereinafter, the longitudinal direction of the first member 3 and the second member 4 is referred to as the "width direction". The first member 3 and the second member 4 of the holding body 2 are connected by the fastener 6 at two locations near both ends in their longitudinal direction (width direction), for example.

[0015] When attaching the main bar spacing retainer 1 to the column main bars, as shown in Fig. 2, for the retainer body 2, the first member 3 is arranged to face the column main bars 10, and the second member 4 is arranged on the opposite side of the column main bars 10 with the first member 3 sandwiched therebetween. That is, when explaining the positional relationship between the first member 3 and the second member 4 with respect to the column main bars, the first member 3 is relatively arranged on the inner side, and the second member 4 is relatively arranged on the outer side. Hereinafter, in the retainer body 2, the side where the first member 3 is arranged is taken as the "front", and the side where the second member 4 is arranged is taken as the "rear" to explain the front-rear direction of the retainer body 2.

[0016] The first member 3 in the retainer body 2 has a first rail portion 31 having a flat plate shape that is longer in the lateral direction than in the vertical direction, and a first flange portion 32 that bends in an L shape from one end (for example, the lower end) in the height direction (vertical direction) of the first rail portion 31. Also, a first guide surface 33 is formed on one surface (rear surface, back surface) of the first rail portion. Further, fastening holes 34, 34 for passing the bolts 61 of the fastener 6 are provided on both end sides in the width direction (length direction) of the first rail portion 31. As an example, the dimension in which the first flange portion 32 extends in the front-rear direction is smaller than the height dimension (vertical dimension) of the first rail portion 31.

[0017] The second member 4 in the retainer body 2 has a second rail portion 41 having a flat plate shape that is longer in the lateral direction than in the vertical direction, and a second flange portion 42 that bends in an L shape from the end portion (for example, the upper end) in the height direction (vertical direction) of the second rail portion 41. Also, a second guide surface 43 is formed on one surface (front surface, front side) of the second rail portion 41. Further, fastening holes 44, 44 for passing the bolts 61 of the fasteners 6, 6 are provided on both end sides in the width direction (length direction) of the second rail portion 41. As an example, the height dimension (vertical dimension) of the second rail portion 41 in the second member 4 is approximately equal to the height dimension (vertical dimension) of the first rail portion 31.

[0018] Figure 5 is a view taken along arrow C in Figure 2. Figure 5 shows a side view of the spacer member 5. The spacer member 5 is an angle member having a Z-shape in side view. The spacer member 5 has a sliding portion 51, a spacer portion 52 that bends in a first direction (forward) from one end (lower end) in the height direction of the sliding portion 51, and a retaining portion 53 that bends in a second direction (rearward) opposite to the first direction (forward) from the other end (upper end) in the height direction of the sliding portion 51. The spacer portion 52 has a width dimension that corresponds to, for example, the design dimension of the spacing between the main reinforcement bars 10 of the column. The width dimension of the spacer portion 52 is the dimension in the direction along the longitudinal direction (width direction) of the spacer member 5 when the spacer member 5 is attached to the holder body 2.

[0019] The first member 3 and the second member 4 of the holder body 2 are connected by fasteners 6, 6 with the first guide surface 33 of the first rail section 31 and the second guide surface 43 of the second rail section 41 facing each other. Reference numeral 7 in Figures 1 and 2 indicates a spacer that is sandwiched between the first guide surface 33 and the second guide surface 43 when the first member 3 and the second member 4 are connected. As an example, the spacer 7 is a washer inserted through the shaft of the bolt forming the fasteners 6, 6. The interposition of the spacer 7 between the first guide surface 33 and the second guide surface 43 creates a gap 20 between the first guide surface 33 and the second guide surface 43 that corresponds to the thickness of the spacer 7. This allows the first member 3 and the second member 4 of the holder body 2 to be assembled with the first guide surface 33 and the second guide surface 43 facing each other at a certain distance apart. Of course, multiple spacers (washers, etc.) may be stacked and arranged. For example, multiple (for example, two) washers may be passed through the shaft of the bolt 61. Furthermore, the gap 20 extends along the longitudinal direction (width direction) of the holder body 2.

[0020] Figure 6 shows the CC cross-section of the main reinforcement spacing holder 1 shown in Figure 1. Figure 7 shows the DD cross-section of the main reinforcement spacing holder 1 shown in Figure 1. The CC and DD cross-sections are cross-sections perpendicular to the longitudinal direction of the main reinforcement spacing holder 1. The CC cross-section shows the cross-section of the main reinforcement spacing holder 1 corresponding to the connection point where the fastener 6 connects the first member 3 and the second member 4 of the holder body 2. The DD cross-section shows the cross-section of the main reinforcement spacing holder 1 passing through the spacer member 5.

[0021] The distance between the first guide surface 33 of the first member 3 (first rail section 31) and the second guide surface 43 of the second member 4 (second rail section 41) (i.e., the thickness dimension of the spacer 7) is the gap 2 The depth dimension of 0 is defined. The depth dimension of the gap 20 may be set to a dimension slightly larger than the thickness of the sliding part 51, for example, so that the sliding part 51 of the spacer member 5 can slide along the gap 20. Hereinafter, the gap 20 of the holder body 2 will be referred to as the "sliding gap".

[0022] Each spacer member 5 is attached to the holder body 2 (first member 3 and second member 4) with its sliding portion 51 inserted into the sliding gap 20, allowing it to slide freely along the sliding gap 20 that extends along the longitudinal direction (width direction) of the holder body 2.

[0023] The vertical dimension (height dimension) of the sliding portion 51 of the spacer member 5 is the same as, or slightly larger than, the distance between the lower end surface of the mutually connected first member 3 (i.e., the lower surface of the first flange portion 32) and the upper end surface of the second member 4 (i.e., the upper surface of the second flange portion 42). Therefore, as shown in Figure 7, the spacer portion 52 extending forward from the lower end of the sliding portion 51 and the retaining portion 53 extending backward in a curve from the upper end of the sliding portion 51 can be positioned along the lower surface of the first flange portion 32 and the upper surface of the second flange portion 42, respectively. By attaching the spacer member 5 to the sliding gap 20 of the holder body 2 in this manner, it is possible to prevent the spacer member 5 from falling out of the sliding gap 20 in the vertical direction.

[0024] Next, the method of using the main reinforcement spacing holder 1 will be explained. Figure 8 shows the main reinforcement spacing holder 1 attached to the column main reinforcement 10. The main reinforcement spacing holder 1 can be fixed to the column main reinforcement 10 by means of binding wire, for example. Figure 8 is a view from above of an example of the arrangement of the main reinforcement spacing holder 1, showing the planar installation configuration of the main reinforcement spacing holder 1. In the example shown in Figure 8, four sets of main reinforcement spacing holders 1 (1A to 1D) are arranged across multiple column main reinforcement 10 that are arranged in parallel in a straight line on each face of the column to be constructed. Figure 9 is a diagram illustrating an example of the arrangement of the main reinforcement spacing holder 1 viewed from direction E (i.e., the side) in Figure 8.

[0025] Figure 8 shows F1 to F4, which represent the positional relationships of the column faces of the column to be constructed (where concrete will be poured). Among the column faces of the column to be constructed (F1 to F4 in Figure 8), the main reinforcement spacing holders 1 placed on mutually adjacent faces (F1 and F2, F2 and F3, F3 and F4, F4 and F1) are installed at staggered heights so that their ends do not interfere with each other (see, for example, Figure 9). For example, main reinforcement spacing holders 1B and 1C adjacent to main reinforcement spacing holder 1A are installed at staggered heights, and main reinforcement spacing holders 1B and 1C adjacent to main reinforcement spacing holder 1C are installed at staggered heights. Alternatively, main reinforcement spacing holders 1A and 1C, and 1B and 1D, which are placed opposite each other, may be installed at the same height. Of course, any of the main reinforcement spacing holders 1A to 1D may be installed at staggered heights.

[0026] In Figure 9, the symbol S1 indicates the "planned concrete pouring section" where concrete is to be poured. The symbol D2 is the "non-concrete pouring section" adjacent to the planned concrete pouring section S1. The non-concrete pouring section S2 is a section where concrete will not be poured. As shown in Figure 9, by installing the main reinforcement spacing holder 1 on the column main reinforcement 10 in the non-concrete pouring section S2, it is possible to prevent the main reinforcement spacing holder 1 from being buried in the concrete when concrete is poured in the planned concrete pouring section S1. Therefore, after concrete has been poured in the planned concrete pouring section S1, the main reinforcement spacing holder 1 can be reused sequentially to maintain the spacing between the column main reinforcement 10 to be placed in the next planned concrete pouring section S1. The symbol 100 in Figure 9 is a hoop reinforcement (stirrups) for restraining the column main reinforcement 10. In Figure 8, the illustration of the hoop reinforcement 100 is omitted. The symbol 1000 in Figure 9 is the existing concrete.

[0027] <Effects> The main reinforcement spacing holder 1 according to this embodiment includes a holder body 2 that is attached to the column main reinforcement bars 10 so as to intersect with the axial direction of the column main reinforcement bars 10 which are arranged in parallel in a straight line, and a plurality of spacer members 5 that are attached to the holder body 2 to maintain the spacing between the column main reinforcement bars 10, and the plurality of spacer members 5 are attached to the holder body 2 so as to be slidable along the longitudinal direction of the holder body 2. By using the main reinforcement spacing holder 1 configured in this way, as shown in Figure 1, the spacing between the column main reinforcement bars 10 before concrete pouring can be suitably maintained (secured). Therefore, the spacing between the column main reinforcement bars 10 can be secured to the dimensions specified in the design, and the risk of rework due to insufficient spacing and repair work after concrete pouring (for example, water chipping work) can be reduced. Furthermore, by installing the main reinforcement spacing holder 1 adjacent to the planned concrete pouring section S1, it is possible to see at a glance that the spacing between the column main reinforcement bars 10 in the planned concrete pouring section S1 has been secured (visualization of spacing assurance). Therefore, construction management becomes easier for managers and supervisors, and the workload on managers and supervisors can be reduced.

[0028] The main reinforcement spacing holder 1 may be attached to the column main reinforcement 10 after the tying work of the column main reinforcement 10 and hoop reinforcement 100 in the planned concrete pouring section S1 is completed, or it may be installed before the tying work of the column main reinforcement 10 and hoop reinforcement 100. In the latter case, the tying work of the column main reinforcement 10 and hoop reinforcement 100 can be performed with the spacer member 5 of the main reinforcement spacing holder 1 inserted between the column main reinforcement 10, so the main reinforcement spacing holder 1 can also be used as a ruler (auxiliary tool) during reinforcement work.

[0029] Furthermore, in the main reinforcement spacing holder 1, the number of spacer members 5 attached to the holder body 2 can, of course, be changed according to the number of parallel main reinforcement bars 10 arranged in a row, that is, the number of target main reinforcement bars 10. Also, since the spacing between the main reinforcement bars 10 is determined by the width dimension of the spacer portion 52 in the spacer member 5, it is advisable to appropriately change the width dimension of the spacer portion 52 according to the design dimension of the spacing. In addition, if the design dimension of the spacing between the main reinforcement bars 10 arranged in a row is not uniform, it is advisable to attach multiple spacer members 5 with different width dimensions of the spacer portion 52 to the holder body 2.

[0030] Furthermore, the main reinforcement spacing holder 1 described above can be modified in various ways. In the main reinforcement spacing holder 1, the spacer member 5, which is slidably mounted along the sliding gap 20 of the holder body 2, may be fixed at any position along the extending direction of the sliding gap 20.

[0031] Figure 10 illustrates a modified spacer member 5A. In the modified spacer member 5A, a screw hole 54 is drilled in the retaining portion 53 so as to penetrate the retaining portion 53. The peripheral wall of the screw hole 54 is provided with a screw groove into which a fixing screw 55 can be screwed. By screwing the fixing screw 55 into the screw hole 54 provided in the retaining portion 53 of the spacer member 5A and tightening the fixing screw 55, the contact surface 56 formed at the tip of the fixing screw 55 is strongly pressed against the upper surface 42A of the second flange portion 42 of the holder body 2 (second member 4). As a result, the spacer member 5A can be positioned and fixed to the second flange portion 42 via the fixing screw 55. This allows the spacer member 5A to be fixed at any position in the sliding gap 20. Furthermore, by loosening or removing the fixing screw 55, the spacer member 5A can be freely moved along the sliding gap 20.

[0032] Alternatively, instead of providing a screw hole 54 in the retaining portion 53 of the spacer member 5A, a similar screw hole 54A may be provided in the spacer portion 52. In that case, as shown in Figure 10, the screw hole 54A should be provided in the portion where the spacer member 5A overlaps the lower part of the first flange portion 32 of the first member 3. A fixing screw 55 is then inserted into the screw hole 54A drilled in the spacer portion 52. By screwing it in and tightening the fixing screw 55, the contact surface 56 is strongly pressed against the lower surface 32A of the first flange portion 32 of the first member 3. As a result, the spacer member 5A can be positioned and fixed to the first flange portion 32 via the fixing screw 55.

[0033] In the example of the arrangement of the main reinforcement spacing holder 1 shown in Figure 9, the main reinforcement spacing holder 1 is installed on the column main reinforcement 10 in a position where the first flange portion 32 of the first member 3 of the holder body 2 is located relatively downward and the second flange portion 42 of the second member 4 is located relatively upward. However, the main reinforcement spacing holder 1 may also be installed with these vertical orientations reversed. [Explanation of Symbols]

[0034] 1...Main bar spacing holder 2. Main body of the holder 3. First component 4. Second component 5. Spacer component 6. Fasteners 7. Spacer 10...Column main reinforcement 20... Gap (sliding gap) 31...First rail section 32...First flange section 33. First guide surface 41...Second rail section 42...Second flange section 43...Second guide surface 51...Slide section 52...Spacer section 53... Retaining part

Claims

1. A main reinforcement spacing holder for maintaining the spacing between main reinforcement bars of a column, A retaining body extending in one direction is attached to the main reinforcing bars of a column so as to intersect with the axial direction of the main reinforcing bars of the column, which are arranged in parallel in a straight line. Multiple spacer members are attached to the main body of the holder and are used to maintain the spacing between the main reinforcement bars of the column. Equipped with, The holder body has a plurality of spacer members mounted so as to be slidable along the longitudinal direction of the holder body. Main bar spacing retainer.

2. The spacer member has a width dimension corresponding to the design dimension of the spacing between the main reinforcement bars of the column. The main reinforcement spacing holder according to claim 1.

3. The holder body includes a first member and a second member that are used in combination, With the first member and the second member assembled, the first guide surface of the first member and the second guide surface of the second member are positioned opposite each other with a gap between them, so that a plurality of the spacer members can be slidably mounted along the longitudinal direction of the holder body. The main reinforcement spacing holder according to claim 1 or 2.

4. The spacer member has a Z-shape in side view and includes a sliding portion inserted between the first guide surface and the second guide surface, a spacer portion that bends in a first direction from one end of the sliding portion in the height direction, and a retaining portion that bends in a second direction opposite to the first direction from the other end of the sliding portion in the height direction. The main reinforcement spacing holder according to claim 3.

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