JP3954610B2 - Rebar spacer - Google Patents

Description

  The present invention relates to a spacer for keeping the covering margin of cast concrete with respect to the reinforcing bars of various reinforced concrete structures at a constant thickness.

  For example, when manufacturing bridge girders on elevated roads, building slabs, and other various reinforced concrete structures, the rebar is positioned and held stably inside the concrete structure forming form, and the cast concrete cover is placed against the rebar. The bill must be secured to a certain thickness.

For this purpose, the applicant of the present invention previously obtained Patent Nos. 2872999 and 29882899 as rebar spacers necessary for this purpose, and they were able to achieve considerable results by commercializing them.
Japanese Patent No. 2872999 Japanese Patent No. 29882899

  According to the configuration of the above-mentioned known invention, both the hooks (16a) and (16b) of the reinforcing bar support arm (A) made of a single spring metal wire are seen from the flat and bottom surfaces of FIGS. The metal wire is bent at a substantially right angle that is capable of encircling the circumferential surface of the reinforcing bar (P), or is bent in an arc shape, and both ends of the metal wire are separated as a pair of insertion guides (17a) (17b). Since the bent hooks (16a) and (16b) are continuously bent outward from the bent tip (in a direction away from the reinforcing bar), the attaching hook can be smoothly attached to the reinforcing bar (P). It can be said that there is an advantage that the steel bar can be held around the circumferential surface of the reinforcing bar (P).

  However, among the reinforcing bars (P) assembled and arranged in a vertical and horizontal crossing state inside the concrete structure forming form (M), a spacer block (B) attached to the vertical bars (main bars) from the horizontal direction (B) ) Is used for grounding to the vertical barrier plate (13) of the above-mentioned formwork (M), or the spacer block (B) attached to the horizontal line (hoop line) from below is also used for the formwork (M). In particular, the spacer block (B) attached to the horizontal line (hoop line) from the lateral direction is the vertical weir of the above-mentioned formwork (M). When grounded to the plate (13), the horizontal hooks (16a) and (16b) of the reinforcing bar supporting arm (A) in the spacer are bent inwardly opposite to each other. Even if it drops off from the hoop muscle) Even if not, both insertion guides (17a) and (17b) projecting outwardly away from the spacer block (B) and the horizontal line (hoop line), which are in the horizontal mounting posture, are added from above the formwork (M). Reinforcing bar spacers that are subject to compressive load (concrete pressure of the pump concrete) and the concrete compaction and excitation force of the cast concrete and swing downward as if turning around the longitudinal axis of the horizontal bars (hoop bars). There is a fatal problem that can not fulfill its original function.

  That is, in the use of the reinforcing bar spacer, the convenience that the both hooks 16a and 16b of the reinforcing bar supporting arm (A) can be smoothly attached to the circumferential surface of the reinforcing bar (P) can be improved. As a result, the spacers can be used for rebars (P) that are assembled and arranged in all directions, both vertically and horizontally and diagonally. I can't use it.

  The present invention aims to improve such problems, and in order to achieve the object, in claim 1, a spacer block made of concrete or cement mortar and a piano wire or other spring metal wire are used. A mounting clip comprising

  The spacer block is shaped into a tapered shape that rises from a substantially flat base surface that contacts the circumferential surface of the reinforcing bar to a top surface that contacts the dam plate of the reinforced concrete structure molding formwork,

  In a reinforcing bar spacer in which a substantially U-shaped or ring-shaped embedded anchor located in the middle part of the mounting clip is embedded and integrated into the spacer block so as to sink by a certain depth from its base surface,

  Extending from the embedded anchor of the mounting clip to a straight state in a reciprocal direction, a pair of straight bars that maintain a non-perpendicular crossing angle with the longitudinal axis of the reinforcing bar, substantially parallel to the base surface of the spacer block,

  A pair of substantially parallel holding arms are extended from the extended tip ends of both straight bars in the direction opposite to the above-mentioned embedded anchor so as to cross the longitudinal axis of the reinforcing bar and to the circumferential surface of the reinforcing bar from the opposite direction. Bend only a certain angle, and

  The tip of the both holding arms extended to a position once away from the circumferential surface of the reinforcing bar is used as an inward arc-shaped locking hook opposite to each other, and the rebar axis or the side farther from the holding arm than the axis. Fold it to point to the eccentric part of

  Moreover, by setting the mutual distance between the inwardly leading ends of the folded locking hooks and the base surface of the spacer block in relation to a dimension slightly narrower than the diameter of the reinforcing bar,

  When both the locking surface of the spacer block and the locking hooks of the mounting clip are in contact with the circumferential surface of the reinforcing bar and forcibly twisted and rotated, both locking hooks become the circumferential surface of the reinforcing bar. It is characterized in that it is expanded and deformed so as to gradually ride up, and it is determined to stick to the joint of the reinforcing bar by the contraction elastic force that is restored as soon as it gets over the longitudinal axis of the reinforcing bar.

  Further, in the second aspect, as a configuration dependent on the first aspect, the pair of the holding arms from the extended tip ends of the two straight bars in the mounting clip are formed in an overall substantially Z-shape with the two straight bars. Fold almost equally in the reciprocal direction by a certain angle of about 65 to 75 degrees,

  Moreover, as the obtuse angle of about 125 to 135 degrees that sandwiches the middle part of both the sandwiching arms to the circumferential surface of the reinforcing bar, it is refracted almost equally in the opposite inward direction,

  Extending the distance between the bending tip of both sandwiching arms and the base surface of the spacer block to a position that is farther from the circumferential surface of the reinforcing bar, the dimension is wider than the diameter of the reinforcing bar,

  A pair of locking hooks are folded back almost equally in an inward arc shape with an acute angle of about 30 to 40 degrees from the extended distal ends of the both sandwiching arms.

  In the above configuration of claim 1, the front ends of both sandwiching arms extended to a position once away from the circumferential surface of the reinforcing bar are used as a pair of locking hooks folded back in an inward arc shape opposite to each other. The distance between the inward leading ends of both locking hooks and the almost flat base surface of the spacer block is set to a dimension that is slightly narrower than the diameter of the reinforcing bar. Or, it is in a state of being directed to the eccentric portion on the side farther from the holding arm than the axis.

  Therefore, if both the hooks of the mounting clip and the base surface of the spacer block are placed in contact with the circumferential surface of the reinforcing bar, the reinforcing bar spacer according to the present invention is forcibly twisted and rotated. As soon as both locking hooks are expanded and deformed so as to ride smoothly on the circumferential surface of the reinforcing bar and get over the longitudinal axis of the reinforcing bar, it will be restored and contracted by itself. It sticks to the milestone and bites into the state.

  Under such a condition, both clamping arms are also pinched from the opposite direction to the circumferential surface of the reinforcing bar, and as a result, the reinforcing bar spacer of the present invention is transverse to the horizontal bar (hoop) as described at the beginning. , And when the top surface of the spacer block is grounded to the vertical dam plate of the reinforced concrete structure molding formwork, the compressive load of the cast concrete applied from above the formwork (pump concrete discharge pressure) Even if the concrete is subjected to compaction and excitation force, there is no risk that the spacer itself will inadvertently swing downward and turn around the horizontal longitudinal axis of the reinforcing bar. As an accurate and constant thickness, there is an effect that can be secured stably. It is to use a spacer.

  In particular, if the structure of claim 2 is adopted, the attachment clip to the reinforcing bar can be automatically and smoothly bent from a single piano wire or other spring metal wire, and the two ends thereof can be separated. A pair of locking hooks that form a part do not protrude outwardly away from the circumferential surface of the reinforcing bar, and both locking hooks that are bent in the opposite inward arc shape, and both that the middle part is bent at an obtuse angle With the entire holding arm, there is an effect that a more stable and strong mounting and use state with respect to the circumferential surface of the reinforcing bar can be obtained.

  Hereinafter, specific configurations of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 28 show a first embodiment of the reinforcing bar spacer, which is a mold for molding various reinforced concrete structures (M). Spacer block (B) used for ground contact and mounting clip (A) to rebar (deformed bar) (P), bent and formed from one piano wire or other spring metal wire The middle part of the clip (A) is embedded and integrated into the spacer block (B).

  First, the spacer block (B) is molded and hardened from concrete or cement mortar into a tall kamaboko shape, and an arcuate top surface (2) raised from the substantially flat base surface (1) by a certain height is formed. The reinforced concrete structure forming mold (M) can be brought into line contact with the weir plate (3). The base surface (1) is substantially rectangular or square when viewed from the plane as shown in FIG.

  That is, the fixed height from the base surface (1) to the top surface (2) in the spacer block (B) fulfills the spacer function that becomes the covering margin (T) of the cast concrete with respect to the reinforcing bars (P). In that case, the reason why the spacer block (B) is formed from concrete or cement mortar is that it is not regarded as an impure buried material of the reinforced concrete structure because it maintains affinity with the cast concrete.

  Moreover, the reason why the top surface (2) of the spacer block (B) is formed into a tapered arc shape is to prevent it from being exposed from the surface of the reinforced concrete structure to a large extent and to give the appearance cosmetic discomfort. This is because the mold releasability from the spacer block molding cavity described later is also improved.

  FIGS. 5 to 7 show the mounting clip (A) extracted, and an intermediate portion of one spring metal wire is used as an embedded anchor (4) to the spacer block (B). And a pair of straight bars (5a) (5b) that are substantially equal to each other in the opposite lateral direction from the U-shaped embedded anchor (4). The length (L1) is extended to an overall straight line state. Both straight bars (5a) and (5b) maintain a crossing angle (α) which is not perpendicular to the longitudinal axis (HH) of the reinforcing bar (P) as shown in FIGS. 26 and 27 when the spacer according to the present invention is used. It becomes a relationship state.

  (6a) and (6b) are continuously viewed from the front ends of the straight bars (5a) and (5b) in an overhanging direction opposite to the U-shaped embedded anchor (4) as shown in FIGS. The pair of sandwiching arms bent at a substantially right angle (β) of both the sandwiching arms (6a) and (6b) when the spacer according to the present invention is used, as shown in FIGS. It is in a relational state that intersects (preferably orthogonally) with the longitudinal axis (HH).

  That is, both the sandwiching arms (6a) and (6b) are substantially parallel to each other when viewed from the plane as shown in FIGS. 2, 5 and 22, and the longitudinal axis (H− H) and the straight bars (5a) (5b) that maintain a non-perpendicular crossing angle (α) are bent almost equally in opposite directions by a fixed angle (γ) of about 65 to 75 degrees Together with the straight bars (5a) and (5b) extending in a straight line, the overall shape is substantially Z-shaped.

  Furthermore, when the both sandwiching arms (6a) and (6b) are viewed from the side as shown in FIG. 7, the middle part of the fixed length (L2) is an obtuse angle (δ) of about 125 to 135 degrees, which is opposite to each other. It is refracted almost equally inwardly, so that it fits in a surrounding state on the circumferential surface of the reinforcing bar (P), and the pair of holding arms (6a) and (6b) hold the reinforcing bar (P) from opposite directions. To get.

  Moreover, the distance (W1) between the distal ends of the sandwiching arms (6a) and (6b) whose halfway portion is refracted at an obtuse angle (δ) and the substantially flat base surface (1) of the spacer block (B). ) Is also secured as a larger dimension than the diameter (D) of the reinforcing bar (P) when viewed from the side of FIGS.

  That is, both sandwiching arms (6a) and (6b) projecting from the front ends of the straight bars (5a) and (5b) forming the attachment clip (A) to the reinforcing bar (P) by a substantially equal length (L2). That is, the bent tip end portion is extended to a position once away from the circumferential surface of the reinforcing bar (P).

  Then, a pair of locking hooks (7a) (7b) continues in an inwardly arcuate shape with an acute angle (θ) of about 30 to 40 degrees from the extended distal ends of the both sandwiching arms (6a) (6b). It is folded almost equally. Furthermore, when both hooks (7a) and (7b) are viewed from the side as shown in FIGS. 4 and 7, the pin core (O) of the reinforcing bar (P) or the holding arm more than the shaft core (O). (6a) It is in the relational state which points to the eccentric part on the side away from (6b).

  Moreover, the inwardly leading end portions of the locking hooks (7a) and (7b) continuously folded from the both holding arms (6a) and (6b), and the substantially flat base surface of the spacer block (B) The mutual distance (W2) from (1) is set to be slightly narrower than the diameter (D) of the pre-reinforcing bar (P).

  Therefore, there is one pair of locking hooks (7a) and (7b) facing inwardly at an acute angle (θ) at the extended distal ends of the sandwiching arms (6a) and (6b) that once move away from the circumferential surface of the reinforcing bar (P). The attachment clip (A) made of the spring metal wire rod can be separated from the both ends of the mounting clip (A), and these can be strongly pushed to the circumferential surface of the reinforcing bar (P). As shown in FIGS. 26 to 28, the hooks (7 a) and (7 b) are eaten stably in the joints (8) of the reinforcing bars (P) in the eccentric part over the longitudinal axis (HH) of the reinforcing bars (P). As a result, there is no risk that the rebar spacer of the present invention will be swung around and turned around the longitudinal axis (HH) of the rebar (P) during use. (Y) and (x) are ribs and nodes forming the joints (8) of the reinforcing bars (P).

  FIGS. 8 to 13 show a molding cavity (C) for a spacer block of a molding die for mass production according to the present invention, which has heat resistance such as ABS resin, polycarbonate, polyacetal (trade name: Duracon) and particularly impact resistance. The body (9) is formed from a high-strength synthetic resin rich in nature into a kamaboko shape having a size corresponding to the spacer block (B).

  Needless to say, the body (9), of course, is opened in a substantially rectangular or square shape corresponding to the base surface (1) of the spacer block (B), but a pair of flat left and right openings from the upper edge of the opening. The rim flanges (10a) and (10b) and a pair of flat front and rear mounting flanges (11a) and (11b) that are depressed by a certain level difference (S) are projecting in the horizontal direction, and the opening It has an overall rectangular or square contour shape of the rim flange (10a) (10b) and the mounting flange (11a) (11b).

  (12a) and (12b) are a pair of left and right receiving holes for stably positioning and supporting the mounting clip (A) for the above-mentioned reinforcing bar spacer. From the opening edge flanges (10a) and (10b) of the molding cavity (C) to the body ( When the molding cavity (C) is viewed from above as a constant depth (G) to 9), the body (9) and the opening are arranged so as to face each other on a substantially diagonal line of the body (9) opening in a rectangle or square. It is cut out in the vicinity of the corners with the edge flanges (10a) and (10b).

  Therefore, the straight bar (5a) (5b) of the mounting clip (A) bent from one spring metal wire is used as both receiving holes (12a) (12b) of the spacer block molding cavity (C). Can be inserted and set in a transverse state from above, resulting in a precise positioning with the spacer block (B).

  (F) is a metal frame base of a molding die common to a large number of such molding cavities (C), and this is a sectional gate from a rectangular top plate (13) and its surrounding support frame (14). A plurality of (four in the illustrated example) molding cavity receiving ports (16) are cut out and distributed on the top plate (13) via parallel partition bars (15). Therefore, each of the molding cavities (C) is inserted and fitted from the back side of the top plate (13) as shown in FIGS.

  Then, only the mounting flanges (11a) and (11b) of the molding cavity (C) are locked to the back surface of the top plate (13), while the remaining opening edge flanges (10a) and (10b) are the top plate (13 ), And a plurality of the molding cavities (C) (three in the illustrated example) are arranged in parallel as a unit, so that the partition rail (15) of the top plate (13) continues. The pressing flange (11) of the molding cavity (C) is sandwiched and pressed from the back side of the top plate (13) by a backing pressing plate (steel plate) (17) against the top plate (13). The screw (18) and its fixing nut (19) may be fastened and integrated with the top plate (13).

  Then, under the state where a large number of the molding cavities (C) are attached to the frame base (F), the ready-mixed concrete and cement mortar that becomes the spacer block (B) of the spacer for the reinforcing bar are as shown in FIGS. Then, the body (9) of each molding cavity (C) is poured into the body (9) from above, and the reinforcing bars are inserted into the mounting clip receiving holes (12a) (12b) of each molding cavity (C). Insert the spacer mounting clip (A) in the transverse state and set it.

  Then, the base surface (1) of the spacer block (B) is formed into its molding cavity by vibrating with a vibrator (not shown) to compact the ready-mixed concrete or cement mortar and replenishing its sediment as necessary. (C) The opening edge flanges (10a) and (10b) are kept in a flat state which is almost flush with the opening edge flanges (10a) and (10b). Obtain the required strength of B).

  When the spacer block (B) is molded and hardened, one worker holds the grip handle (steel bar) (20) of the frame base (F) with both hands, and stands upright from the top plate (13). The beating tube (round steel tube) (21) is struck onto a work table (not shown), whereby the spacer block (B) is extracted from the body (9) of the molding cavity (C) and removed.

  In that case, since the body (9) of each molding cavity (C) has a tapered shape as a kamaboko type, together with the smooth surface of the synthetic resin itself, the above-mentioned concrete or cement mortar skin (spacer) The block releasability is improved.

  As shown in FIG. 2, the spacer bars (5a) and (5b) of the mounting clip (A) have a rectangular or square shape as viewed from the plane of FIG. The base surface (1) is formed to extend in a straight line along a substantially diagonal direction, and the two holding arms (6a) and (6b) of the mounting clip (A) are also opposed to the base surface (1). In the example shown in the figure, it is arranged in a state of being substantially parallel to the long side of the rectangle).

  Moreover, not only the embedded anchor (4) located in the middle part of the mounting clip (A), but also the straight bars (5a) and (5b) extending from the opposite direction to the inside of the spacer block (B) As a result of sinking by a certain depth (G) from the substantially flat base surface (1), the result is that it is partially embedded deeply.

  Therefore, when the spacer of the present invention is twisted and rotated as will be described later and attached to the reinforcing bar (P), the relative play between the mounting clip (A) and the spacer block (B) and The resulting spacer block (B) can be reliably prevented from being lost, and the appearance cosmetic effect as a reinforcing bar spacer is also enhanced.

  In addition, a pair of straight bars (5a) (5b), clamping arms (6a) (6b) and locking hooks (7a) (7b) in which the mounting clip (A) is partially exposed from the spacer block (B) On the other hand, it is effective to give a surface treatment for rust prevention prior to the formation of the spacer block (B) by the molding cavity (C).

  For the surface treatment, a substantially U-shaped embedded anchor (4) bent at the intermediate portion of the mounting clip (A) is utilized and conveyed along an automatic line as shown in FIGS. The mounting clip (A) is once brought to a high temperature (for example, about 300 ° C.) by passing it through a heating furnace (not shown) in a state of being hung from the hanger hook (23) of the bar (22). It is heated and subsequently immersed in a rust preventive powder tank (not shown), and the rust preventive powder (24) is paired with a pair of straight bars (5a) (5b) and clamping arms (6a) (6b) in the mounting clip (A). ) And the locking hooks (7a) and (7b). (25) shows a coating film fused and integrated by heating the rust preventive powder (24).

  That is, the embedding anchor (4) of the mounting clip (A) has a substantially U-shape, so that the surface treatment for rust prevention is performed while suspending the hanger hook (23) in an inverted state conveniently. Not only can it be performed automatically and continuously, but the concrete block or cement mortar of the spacer block (B) smoothly penetrates and penetrates inside the U-shaped bend, so the embedded state in the spacer block (B) is also possible It can be kept strong, and there is no possibility that it will loosely move relative to the mounting clip (A) or even drop off.

  Of course, if the embedded anchor (4) can achieve such an effect, it may be bent not only in the U-shape but also in, for example, an Ω shape or bent in a ring shape.

  FIG. 21 shows an overall outline of a reinforcing bar rod assembled and arranged in a formwork (M) for forming a reinforced concrete structure (for example, a bridge girder of an elevated road), and FIG. 22 shows a part of FIG. FIG. 2 is an enlarged plan view illustrating the use state of the present invention attached to the reinforcing bar (lateral bar) (P) of the reinforcing bar rod.

  In attaching and using the spacer for reinforcing bar of the present invention to the reinforcing bar (lateral bar) (P), the operator holds the spacer block (B) with one hand, and first of all, the spacer block (B) The base surface (1) is applied to the circumferential surface of the reinforcing bar (lateral bar) (P), and both straight bars (5a) and (5b) of the mounting clip (A) are viewed from the front as shown in FIG. Both crossed at a large angle with the longitudinal axis (H-H) of the reinforcing bar (horizontal bar) (P), and folded back inward from each other from the extended tips of the holding arms (6a) and (6b). The locking hooks (7a) and (7b) are applied so as to come into contact with the circumferential surface of the reinforcing bars (lateral bars) (P) from opposite directions.

  At this time, as is apparent from FIG. 25, both the holding arms (6a) and (6b) of the mounting clip (A) are not yet in contact with the circumferential surface of the reinforcing bars (lateral bars) (P), and the extension tips thereof Both locking hooks (7a) and (7b) folded inward from the portion do not reach the maximum diameter portion of the reinforcing bar (lateral bar) (P), and the longitudinal axis (HH) thereof is not reached. It has not yet been overcome.

  Accordingly, while holding the spacer block (B) with one hand, the reinforcing clip spacer is forcibly twisted and rotated in the direction of the arrow (R) from the state shown in FIGS. (A) Both clamping arms (6a) (6b) and both locking hooks (7a) (7b) are locked in the inserted state on the circumferential surface of the reinforcing bars (lateral bars) (P).

  At that time, both the holding arms (6a) and (6b) of the mounting clip (A) and the locking hooks (7a) and (7b) are pushed in from the back direction with the fingertips of the other hand, and the torsional rotation operation is performed. It is desirable to help.

  A mounting clip (A) for the above-mentioned reinforcing bar (horizontal bar) (P) of the present invention is formed by bending from one piano wire or other spring metal wire, and a pair of locking hooks that form both ends of the clip. (7a) (7b) and the distance (W2) between the substantially flat base surface (1) in the spacer block (B) is narrower than the diameter (D) of the reinforcing bar (lateral bar) (P). Therefore, during the twisting / rotating operation of the spacer, as is apparent from the comparison between FIGS. 24 and 25 and FIGS. 27 and 28, both locking hooks (7a) and (7b) are reinforcing bars (horizontal bars). As soon as the circumferential surface of (P) is gradually expanded, it deforms and restores itself as soon as it gets over the maximum diameter part (on the longitudinal axis) of the rebar (transverse) (P). , The restored elastic pressure (rebar) ) Is milestone (eating strongly on the state Tsukitate to 8) the stick of.

  As a result, both the sandwiching arms (6a) and (6b) of the mounting clip (A) finally become longer from FIGS. ) Substantially perpendicularly to the circumferential surface of the reinforcing bar (lateral bar) (P), or inwardly opposite to each other from the extended distal ends of the holding arms (6a) and (6b). As shown in FIG. 28, the hooks (7a) and (7b) folded back to the shaft (O) of the reinforcing bar (horizontal bar) (P) or the clamping arm (6a) than the shaft core (O) are provided. Combined with directing to the eccentric part on the side away from (6b), when mounted on the reinforcing bar (horizontal bar) (P) of the above-mentioned reinforcing bar rod, the compressive load of the pouring concrete (from the pump) Concrete discharge pressure) and concrete compaction vibration force. (Horizontal bars) (P) not to drop off, of course, there is no risk of turning around the longitudinal axis (HH) of the reinforcing bars (P) (P), and the vertical direction in the mold (M) The cast concrete cover allowance (T) with the weir plate (3) can always be secured at a correct constant thickness, and is excellent in stability.

  In addition, when the spacer of the present invention is attached to the longitudinal bar (main bar) (P) of the above-mentioned reinforcing bar rod, it is a matter of course that the same effect as this can be obtained. Can be used universally without any hindrance to the reinforcing bars (P) assembled and arranged.

  Next, FIG. 29 shows a second embodiment of the present invention. In this reinforcing bar spacer, as is clear from the comparison with FIG. 1, the attachment clip (A) to the reinforcing bar (P) is attached to the rim-shaped spacer block. Due to the arrangement relationship with (B), the first embodiment is embedded and integrated into the spacer block (B) as an orthogonal directionality.

  FIG. 30 shows a third embodiment of the present invention, in which the spacer block (B) of the reinforcing bar spacer is shaped into a truncated pyramid shape as can be confirmed from the comparison with FIG. The flat top surface (2) is stably brought into surface contact with the weir plate (3) of the mold (M) for forming the reinforced concrete structure.

  For example, when forming a slab of a building as the reinforced concrete structure, since the bottom surface of the slab is not seen from the outside, the spacer of the present invention is attached to the reinforcing bar (horizontal bar) (P) from below. Even if the top surface (2) of the spacer block (B) is brought into surface contact with the weir plate (3) of the formwork (M), there is no trouble such as giving an uncomfortable appearance.

  Further, FIG. 31 shows a fourth embodiment of the present invention. In this rebar spacer, the spacer block (B) is formed into a conical shape or a pyramid shape instead of the above-mentioned kamaboko type or truncated pyramid shape, and the conical shape is formed. The shaped top surface (2) is brought into point contact with the weir plate (3) of the reinforced concrete structure forming mold (M).

  As is apparent from FIG. 31, both straight bars (5a) and (5b) of the mounting clip (A) have a diameter line in relation to the circular base surface (1) of the spacer block (B). As a state extending along the direction, the spacer block (B) may be embedded and integrated.

  The spacer block (B) of the second to fourth embodiments shown in FIGS. 29 to 31 is formed by the molding cavity (C) having a body (9) having a size and shape corresponding to the spacer block (B). Since the mounting clip (A) and other structures molded and integrated in the same order as the form are substantially the same as those of the first embodiment, the FIGS. In FIG. 31, only the reference numerals corresponding to those in FIGS. 1 to 7 are entered, and detailed description of the second to fourth embodiments is omitted.

  In short, as the spacer block (B) of the spacer for a reinforcing bar according to the present invention, a taper shape from the substantially flat base surface (1) to the top surface (2) is sufficient. The spacer block (B) can be easily extracted from the spacer block molding cavity (C) and removed from the mold, and there is no possibility of the spacer block (B) being dropped or otherwise damaged.

It is a slope view showing a 1st embodiment of a spacer for reinforcing bars concerning the present invention. It is a top view of FIG. FIG. 3 is a front view of FIG. 2. FIG. 4 is a side view of FIG. 3. It is a top view which extracts and shows the attachment clip to a reinforcing bar. FIG. 6 is a front view of FIG. 5. FIG. 7 is a side view of FIG. 6. It is a perspective view which extracts and shows the molding cavity for spacer blocks. It is a top view of FIG. FIG. 10 is a front view of FIG. 9. It is a side view of FIG. FIG. 12 is a cross-sectional view taken along line 12-12 of FIG. 9. FIG. 13 is a cross-sectional view taken along line 13-13 in FIG. 9. It is a front view which shows a shaping die. It is a side view of FIG. It is a top view which shows the shaping | molding state of the reinforcing bar spacer by a shaping die. FIG. 17 is a cross-sectional view taken along line 17-17 in FIG. 16. FIG. 18 is a cross-sectional view taken along line 18-18 in FIG. 16. It is explanatory drawing which shows the surface treatment process for rust prevention with respect to the exposed part of a mounting clip. FIG. 20 is a side view of FIG. 19. It is a top view which shows the use condition of the spacer for reinforcing bars which concerns on this invention. It is a top view which expands and shows a part of FIG. FIG. 23 is a cross-sectional view taken along line 23-23 in FIG. 22. It is a front view which shows the attachment process of the spacer with respect to a reinforcing bar. It is an expanded sectional view which follows the 25-25 line of FIG. It is a state slope view which attached the spacer to the reinforcing bar. It is a front view of FIG. FIG. 28 is an enlarged sectional view taken along line 28-28 in FIG. 27. It is a perspective view corresponding to FIG. 1 which shows 2nd Embodiment of the spacer for reinforcing bars which concerns on this invention. It is a perspective view corresponding to FIG. 1 which shows 3rd Embodiment of the spacer for reinforcing bars which concerns on this invention. FIG. 6 is a perspective view corresponding to FIG. 1 showing a fourth embodiment of a reinforcing bar spacer according to the present invention.

Explanation of symbols

(1)-Base surface (2)-Top surface (3)-Dam plate (4)-Embedded anchor (5a) (5b)-Straight bar (6a) (6b)-Holding arm (7a) (7b)-Engagement Stop hook (8), joint (9), body (10a) (10b), opening edge flange (11a) (11b), mounting flange (12a) (12b), mounting clip receiving hole (13), top plate ( 14) ・ Support frame (15) ・ Partition bar (16) ・ Molding cavity receiving port (17) ・ Backing press plate (18) ・ Screw screw (19) ・ Fixing nut (20) ・ Grip handle (21) ・ Tapping Pipe (A), Mounting clip (B), Spacer block (C), Spacer block molding cavity (F), Frame base (M), Reinforced concrete structure molding form (P), Rebar (T) Setting Head allowance Nkurito (H-H) · rebar longitudinal axis (O) · axis (R) · twisting rotation operation direction of the reinforcing bar (L1) (L2) · predetermined length (W1) (W2) · spacing

Claims (2)

A spacer block (B) made of concrete or cement mortar and a mounting clip (A) made of one piano wire or other spring metal wire,
From the substantially flat base surface (1) that contacts the circumferential surface of the reinforcing bar (P) to the spacer block (B), the top surface that contacts the weir plate (3) of the reinforced concrete structure forming frame (M) ( 2) Shaped into a tapered shape that rises up to
A substantially U-shaped or ring-shaped embedded anchor (4) located in the middle part of the mounting clip (A) is inserted into the spacer block (B) by a certain depth (G) from its base surface (1). In the reinforcing bar spacer embedded in the sinking state,
Crossing angle that is not perpendicular to the longitudinal axis (HH) of the reinforcing bar (P), substantially parallel to the base surface (1) of the spacer block (B) from the embedded anchor (4) of the mounting clip (A) Extending a pair of straight bars (5a) and (5b) that will maintain (α) in a linear state in the opposite direction,
A pair of substantially parallel holding arms (6a) and (6b) are extended from the extended distal ends of the straight bars (5a) and (5b) in the direction opposite to the embedded anchor (4), and the longitudinal direction of the reinforcing bar (P). Fold only a certain angle (β) that intersects the axis (H-H) and is sandwiched from the reciprocal direction to the circumferential surface of the reinforcing bar (P),
The both ends of the sandwiching arms (6a) (6b) are extended to a position where they are once moved away from the circumferential surface of the reinforcing bar (P), and the inward arc-shaped locking hooks (7a) (7b) opposite to each other are used as the reinforcing bars. (P) is folded back so as to be directed to the shaft core (O) or the eccentric portion on the side farther from the clamping arm (6a) (6b) than the shaft core (O),
Moreover, the mutual distance (W2) between the inwardly leading end portions of the folded back locking hooks (7a) and (7b) and the base surface (1) of the spacer block (B) is defined as the diameter (D) of the reinforcing bar (P). ) By setting related to slightly narrower dimensions,
Forcing the base surface (1) of the spacer block (B) and the hooks (7a) (7b) of the mounting clip (A) to contact the circumferential surface of the reinforcing bar (P) When the two hooks 7a and 7b are twisted and rotated, they are expanded and deformed so as to gradually run on the circumferential surface of the reinforcing bar (P), and the longitudinal axis of the reinforcing bar (P) (HH) ) A spacer for reinforcing bars characterized in that it is determined to stick to the joint (8) of the reinforcing bar (P) by the contraction elastic force that is restored as soon as it is over the top. A pair of clamping arms (6a) and (6b) from the extended tip ends of both straight bars (5a) and (5b) in the mounting clip (A) is generally Z-shaped with both straight bars (5a and 5b). Bend almost equally in the reciprocal direction by a constant angle (γ) of about 65 to 75 degrees so as to form a mold,
In addition, the midway part of the sandwiching arms (6a) and (6b) is refracted almost equally to the opposite inward direction as an obtuse angle (δ) of about 125 to 135 degrees sandwiching the circumferential surface of the reinforcing bar (P). With
The mutual distance (W1) between the bent tip of the sandwiching arms (6a) and (6b) and the base surface (1) of the spacer block (B) is set to a dimension wider than the diameter (D) of the reinforcing bar (P). , Extend it to the position once away from the circumferential surface of the rebar (P),
The pair of locking hooks (7a) and (7b) is folded back almost equally in an inward arc shape with an acute angle (θ) of about 30 to 40 degrees from the extended distal ends of the sandwiching arms (6a) and (6b). The spacer for reinforcing bars according to claim 1, wherein

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