JP3737097B2 - Concrete formwork spacer and method for manufacturing reinforced concrete structure using the same - Google Patents

Description

  The present invention relates to a concrete formwork spacer for setting a concrete cover thickness with respect to a reinforcing reinforcing bar in a reinforced concrete structure, and a method for manufacturing a reinforced concrete structure using the same, and the reinforcing reinforcing bar before the concrete is placed. Can be easily mounted, and the mold frame can be firmly and stably positioned, and a new structure spacer for a concrete mold and a new method for manufacturing a reinforced concrete structure using the same It is about.

  Conventionally, reinforced concrete structures have been widely adopted in the fields of building structures and civil engineering structures, but in order to achieve the desired strength and shape in such reinforced concrete structures, a plurality of reinforcing bars are assembled. When placing concrete to cover the bar arrangement formed in step 1, the distance from the surface of the reinforcing bar to the concrete surface (concrete cover thickness) can be adjusted to the design value with high accuracy. It becomes important.

  By the way, in order to set the concrete cover thickness, the relative position of the formwork with respect to the prefabricated reinforcing bars must be set with high accuracy, and with the strength that can withstand the pressure of the concrete driven into the concrete placement space in the formwork. It is necessary to position and hold the mold.

  Therefore, conventionally, a screw rod such as a separator and a screw fastener such as a cone are provided as described in Patent Document 1 (Japanese Patent Laid-Open No. 8-151793) and Patent Document 2 (Japanese Patent Laid-Open No. 9-72093). A method for fixing the formwork to the reinforcing bars has been proposed, but there is a problem that the construction is complicated and the number of parts is large, so that the construction is troublesome and takes time.

  In addition, as described in Patent Document 3 (Japanese Patent Laid-Open No. 8-226195), Patent Document 4 (Japanese Patent Laid-Open No. 2000-54565), and Patent Document 5 (Japanese Patent Laid-Open No. 2002-339511), There has been proposed a method in which an annular spacer is externally fitted and the outer peripheral surface of the spacer is brought into contact with the mold frame to set a separation distance between the mold frame and the reinforcing bar. However, since such an annular spacer has a shape that spreads from the reinforcing bar toward the entire periphery, the overall size becomes significantly larger when the cover thickness is increased and the diameter is increased. There is also a problem that if it is made of concrete in consideration of environmental problems, it becomes too heavy and hinders work. Furthermore, there has been a problem that when the concrete is poured, the fluidity of the concrete in the placement space is hindered by the spacers, so that poor filling is likely to occur.

  In Patent Document 6 (Japanese Patent No. 2872999) and Patent Document 7 (Japanese Patent Laid-Open No. 2000-145021), a pair of wire-like locking legs made of a metal wire made of spring protrudes from a concrete block. By forming and sandwiching the rebar with such a locking leg, the concrete block is positioned directly protruding from the surface of the rebar, and the distance between the formwork and the rebar is set by bringing the tip of the concrete block into contact with the formwork Spacers designed to do this have been proposed.

  However, in concrete blocks having such locking legs, the concrete block increases in size especially when the cover thickness increases. It was difficult to fix to each other, and it was necessary to fix the locking legs one by one by binding the reinforcing bars to the reinforcing bars using a binding wire, which was also a factor in prolonging the construction period.

  Moreover, even if it fixed to a reinforcing bar with a binding wire, it was difficult to firmly fix a spacer in a specific direction at a specific position on the surface of the reinforcing bar having a circular outer peripheral surface. That is, external forces such as the force generated by bringing the concrete block into contact with the formwork when the formwork is installed, the pressure generated when concrete is poured into the formwork, and the vibration applied to distribute the concrete evenly in the formwork There is a possibility that the installation direction of the spacer may be shifted depending on the case, and in some cases, the spacer may fall off the reinforcing bar.

  Moreover, in order to firmly fix the concrete block to the wire-like locking leg portion, it is necessary to bend the wire-like locking leg portion in an annular shape or the like. Since it was formed, there also existed a problem that manufacture with such a process was difficult.

  Instead of tying a pair of wire-like locking legs protruding from the concrete block to the reinforcing bars as described in Patent Document 6 and Patent Document 7 described above, for example, their engagement It is also conceivable that the stop leg portion is bent or bent into a hook shape to form a hook-shaped locking portion, and the concrete block is supported by hooking the reinforcing bar at the hook-shaped locking portion. However, if the concrete block is suspended by a pair of wire-like locking legs, the concrete block becomes more unstable, and it becomes more difficult to secure the desired cover thickness by being displaced or tilted. It cannot be any solution.

JP-A-8-151793 JP-A-9-72093 JP-A-8-226195 JP 2000-54565 A JP 2002-339511 A Japanese Patent No. 2872999 Japanese Patent Laid-Open No. 2000-145041

  Here, the present invention has been made in the background of the circumstances as described above, and the problem to be solved is that it can be easily attached to the reinforcing bar, and in the concrete placing process To provide a spacer for a concrete formwork having a novel structure that can stably maintain its mounting position and mounting direction, and can stably construct a reinforced concrete structure with a target cover thickness. .

  Another object of the present invention is to provide a novel method for producing a reinforced concrete structure, which can easily and quickly construct a reinforced concrete structure having a target cover thickness.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

That is, a feature of the present invention is that a support plate metal fitting having a longitudinal plate shape with a predetermined width is folded in a curved shape at an intermediate portion in the longitudinal direction to form a latching portion, and extends from the latching portion. with block support arm and the guide arm is formed by a pair of folded-back portion that issued the longitudinal direction lower end of the block support arm is caused to bend at a substantially right angle are a fixed portion, with respect to solid deposition section while being fixed concrete spacer blocks the spacer blocks are caused to protrude substantially at right angles from the longitudinal lower edge portion of said block support arm Te, said block support arm the guide arm toward the longitudinal distal end side are the enlarging shape away from the, the upper reinforcing bar against該掛stopper portion by expanding portions of the guide arms and said block support arm And inner with adapted can be hooked supported by the upper reinforcing bars, the spacer block is made to protrude by setting the head thickness from reinforcement surface rebar under such hooking support state the spacer block it is adapted to be able to position the concrete form by the projecting distal end face of the further the support plate fitting, protruding from the longitudinal bottom portion of the block support arm, wherein the spacer block is fixed, manually By applying an external force, a locking piece that is deformable so as to be wound around the outer periphery of a lower reinforcing bar that is positioned below the upper reinforcing bar and extends in the horizontal direction together with the upper reinforcing bar and is locked to the lower reinforcing bar is integrated. In the concrete formwork spacers that are formed.

  In such a concrete formwork spacer having a structure according to the present invention, it can be easily attached to the reinforcing bar by being hooked and supported by the reinforcing bar. In particular, since the guide arm and the block support arm are formed in an expanded shape so as to guide the rebar at the time of mounting, the latching operation can be performed more quickly.

  In addition, since the support plate bracket is formed in a longitudinal plate shape, it is possible to ensure a large contact surface to the reinforcing bar in the longitudinal direction of the reinforcing bar in the hooked state, and thereby the width direction of the support plate bracket Since the wobble is prevented, the mounting direction can be kept stable. Therefore, in many cases, it is not necessary to use an auxiliary fixing means such as a binding wire, so that such auxiliary fixing work can be omitted, labor load can be reduced, and work time can be shortened. .

  Such a concrete formwork spacer has a simple structure in which a concrete spacer block is fixed to a single support plate metal fitting, and can be easily and inexpensively manufactured.

  In addition, the concrete formwork spacer structured according to the present invention is formed of a metal material and a concrete material in the same manner as the constituent material of reinforced concrete, and does not employ a synthetic resin material like a conventional spacer. Therefore, the decrease in strength of the reinforced concrete does not become a big problem by adopting, and the processing at the time of dismantling in the future is easy, and the reuse of resources becomes possible.

  Furthermore, by simply changing the length of the spacer block in the protruding direction, it is possible to provide spacers for concrete molds that can accommodate various design cover thicknesses. Therefore, when the design cover thickness of concrete structures is large Even so, it is possible to cope without significantly increasing the size of the entire spacer.

  Furthermore, since the spacer block is made of concrete and has a sufficient strength for positioning the formwork even if it is not particularly large, it can have a long and thin shape extending in the protruding direction. . Moreover, since the metal block is embedded and fixed inside the spacer block, the reinforcing action of this block can advantageously ensure good strength even if it is small and elongated. It can be done.

  Moreover, in this invention, the structure which restrict | squeezed the opening part of the latching part and made the clearance gap dimension of this latching part smaller than the outer diameter dimension of a reinforcing bar is employ | adopted suitably. By adopting such a configuration, when an external force is applied with the concrete formwork spacer attached to the bar arrangement, it is possible to prevent the dropout or inclination from the bar arrangement when a vertical upward external force is applied. This can be prevented more effectively.

  Further, in the present invention, preferably, a configuration is adopted in which the protruding tip of the guide arm is brought into contact with the concrete formwork in a state where the hook is hooked and supported by the reinforcing bar. The If such a structure is employ | adopted, an installation position and an installation direction can be hold | maintained more stably by contact | abutting to the formwork of the protrusion front-end | tip part of a guide arm.

  In the present invention, preferably, the vicinity of the tip of the block support arm is arranged adjacent to the reinforcing bar, for example, in a state where the hooking part is hooked and supported by the reinforcing bar. A configuration in which the length of the block support arm is designed to be positioned so as to be superimposed on the reinforcing bar of the steel bar may be employed. In such a configuration, it is possible to position the base end portion of the spacer block by directly or indirectly supporting the spacer block with a reinforcing bar, thereby preventing rotational displacement around the reinforcing bar central axis of the entire concrete formwork spacer. It becomes possible. In other words, the concrete formwork spacer can be fixedly positioned and supported by skillfully using the arranged reinforcing bars.

  Moreover, in this invention, the structure by which the protrusion front end surface of the said spacer block is made into a plane can be employ | adopted suitably. In such a configuration, the contact force of the mold frame is stably acted in the central axis direction of the spacer block under the state where the protruding front end surface of the spacer block is brought into contact with the mold frame. Displacement such as the inclination of the spacer block due to the component of the contact force can be prevented more advantageously, and the mold can be positioned more stably.

  Furthermore, in the present invention, it is preferable to adopt a configuration in which a locking piece that can be locked to the reinforcing bar is integrally formed by the block support arm at the tip of the block support arm. In such a configuration, both ends of the arm can be directly supported by the reinforcing bar, and the entire concrete formwork spacer can be more firmly fixed to the reinforcing bar. In addition, no special member such as a binding wire is required for such fixing, and the work can be facilitated with a simple structure.

  In the present invention, a configuration in which the spacer block is formed so as to protrude toward both sides in the plate thickness direction of the block support arm can be suitably employed. In such a configuration, when a wall body or the like is constructed by arranging molds on both sides of the reinforcing bar, it is possible to simultaneously set the cover thicknesses on both sides in the plate thickness direction with respect to the reinforcing bar. In addition to reducing the labor and time required for the work, the number of required concrete mold spacers can also be reduced. In addition, since the spacer block is brought into contact with the mold at the two leading end portions in the longitudinal direction, the stability under the mounted state of the spacer block can be improved.

Furthermore, a feature of the present invention relating to a method for manufacturing a reinforced concrete structure is that a concrete material is provided for a concrete placement space formed by arranging a concrete formwork on the outside where a plurality of reinforcing bars are assembled and arranged. When manufacturing a reinforced concrete structure by staking a concrete form spacer, which is structured according to the present invention as described above, the above-mentioned reinforcing part is hooked on the upper stage reinforcing bar. The concrete formwork spacer is mounted by locking the engaging part so as to be wound by manually applying external force to the lower reinforcing bar extending horizontally along with the upper reinforcing bar below the upper reinforcing bar. The projecting front end surface of the spacer block is brought into contact with the inner surface of the concrete formwork, thereby the concrete formwork It is positioned at a predetermined distance to form between the concrete 設空 against iron muscle, lies in the so drive the concrete material to between the concrete 設空.

  According to such a method of the present invention, the cover thickness of the concrete with respect to the reinforcing steel bars can be accurately adjusted to the design value, and a reinforced concrete structure having a desired strength and durability can be stably realized. .

  As is clear from the above description, the concrete formwork spacer having the structure according to the present invention can be easily attached to the reinforcing bar, and its mounting position and mounting can also be performed in the concrete placing process. The direction can be kept stable.

  Further, by using the concrete formwork spacer having the structure according to the present invention for the production of the reinforced concrete structure, the reinforced concrete structure having the target cover thickness can be stably constructed.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIGS. 1 to 7 show a concrete mold spacer 10 as a first embodiment of the present invention. The concrete formwork spacer 10 is configured by fixing a spacer block 14 to a support plate bracket 12. In the following description, the vertical direction means the horizontal direction in FIG. 1, the horizontal direction means the vertical direction in FIG. 1, and the front-back direction means the vertical direction in FIG.

  More specifically, the support plate 12 is a metal plate material having a longitudinal shape with a predetermined width, and the upper portion is folded back so as to be along the outer peripheral surface of the upper rebar 32 to form the latching portion 16. . The latching portion 16 is curved in a hairpin shape as a whole, and the block support arm 18 and the guide arm 20 are formed so as to face each other by a portion extending from the latching portion 16 to substantially the same side. In addition, by narrowing the opening portion of the latching portion 16, the distance between the opposed surfaces of the block support arm 18 and the guide arm 20: C is made smaller than the outer diameter size of the upper rebar 32: D, so that the shape of the diaphragm is locked. A portion 22 is formed.

  Here, the vertical distance from the upper end of the latching portion 16 to the lower end of the block support arm 18 is made substantially equal to the reinforcing bar interval between the upper rebar 32 and the lower rebar 34. The vicinity of the lower end of the block support arm 18 is a reinforcing bar contact portion 28. Further, the lower end portion of the block support arm 18 is bent at a substantially right angle to the block support arm 18 on the side opposite to the side on which the guide arm 20 is disposed, so that a bent portion 26 is formed.

  The spacer block 14 is fixed to the bent portion 26. The spacer block 14 is a substantially cylindrical concrete lump, and a bent portion 26 enters from one end surface in the axial direction, and is embedded and fixed from an intermediate portion in the axial direction of the spacer block 14 to the vicinity of the tip portion.

  The spacer block 14 is formed so as to protrude from the block support arm 18 to one side in the plate thickness direction at a substantially right angle, like the bent portion 26. In particular, in this embodiment, the spacer block 14 protrudes toward the side opposite to the side where the guide arm 20 is located. The protruding front end surface of the spacer block 14 is a mold contact surface 30 having a circular flat surface shape extending in a direction perpendicular to the axis with a predetermined area.

  On the other hand, the guide arm 20 has an expanded shape that gradually separates from the block support arm 18 toward the tip thereof, and the tip of the guide arm 20 serves as a mold contact portion 24. In particular, in the present embodiment, the guide arm 20 has a gently curved shape that protrudes toward the block support arm 18, and is largely opened between the guide arm 20 and the block support arm 18.

  The concrete mold spacer 10 having the above-described structure is obtained by punching a base plate by, for example, press working to obtain a long-plate-shaped metal base plate. The hooking portion 16, the block support arm 18 and the guide arm 20 as described above are formed by processing. In addition, a predetermined forming mold is prepared in a process before the plastic working or after the plastic working, and a bent portion 26 at one end of the metal base plate is inserted into the forming mold, and the forming mold is inserted. The mortar is filled and cured, so that the spacer block 14 is formed and, at the same time, is fixed to the bent portion 26. Thereby, the target concrete mold spacer 10 can be obtained.

  In the production, for example, a pipe made of vinyl chloride can be used as a mold for forming the spacer block 14.

  Then, the concrete mold spacer 10 having such a structure is, for example, as shown in FIG. 7, the latching portion 16 is latched by the upper rebar 32 extending in the horizontal direction, and is supported by the block. The arm 18 is attached to the bar arrangement with the arm 18 hanging downward substantially vertically. In particular, in the present embodiment, as shown in the figure, the rebar contact portion 28 is brought into contact with the lower rebar 34 in such a mounted state, while the mold contact surface 30 and the mold contact portion. 24 is brought into contact with the inner surfaces of the molds 36 and 38, respectively.

  The concrete formwork spacer 10 is hooked and supported on the upper rebar 32 by the latching portion 16 by guiding the upper rebar 32 to the latching portion 16 by the expanded portions of the block support arm 18 and the guide arm 20. At least it can be easily mounted. Furthermore, in the concrete placing process, even when an external force acts on the concrete mold spacer 10, the support plate metal 12 is formed by a plate metal having a predetermined width, so that the concrete mold spacer 10 can be applied to the reinforcing bars. The wobble is effectively prevented. In particular, in the present embodiment, it is firmly fixed and attached to the bar arrangement by latching by the latching portion 16, latching by the latching portion 22, and abutment by the reinforcing bar abutting portion 28. It is possible to stably hold the installation position and installation direction.

  Specifically, when the rotation about the latching portion 16 in a direction substantially parallel to the molds 36 and 38 occurs, the support plate 12 is formed into a plate shape having a predetermined width. This prevents wobbling in the left-right direction. Furthermore, when a vertical downward external force is applied due to the latching portion 16 being hooked to the upper rebar 32, the mounting state can be maintained, whereas when the locking portion 22 is locked, a vertical upward external force is applied. In this case, the concrete formwork spacer 10 is prevented from falling off the bar arrangement, and the attached state is maintained. Further, when the reinforcing force is applied to the lower reinforcing bar 34 by the reinforcing bar abutting portion 28 and a rotational force with the upper reinforcing bar 32 as the rotation axis is applied, the protruding tip of the spacer block 14 is prevented from facing downward. The

  Furthermore, since the mold contact portion 24 is in contact with the inner surface of the mold 38, it is possible to more effectively prevent the installation direction from being shifted.

  In addition, since the mold contact surface 30 that is in contact with the inner surface of the mold 36 is a flat surface, the displacement of the installation direction of the concrete mold spacer 10 when contacting the mold 36 is made. Therefore, the mold 36 can be positioned accurately and stably.

  Furthermore, the latching portion 16, the block support arm 18 and the guide arm 20 do not need to have a constant width dimension between their mutual parts and over the entire length of each part, but as in the present embodiment. Further, the hooking portion 16, the block support arm 18 and the guide arm 20 are formed over substantially the entire length and with a substantially constant width dimension between each other, thereby facilitating manufacture.

  In particular, in the latching portion 16, in order to effectively obtain a stable positioning function with respect to the reinforcing bars, the width dimension B is preferably 10 mm ≦ B, and more preferably 15 mm ≦ B. On the other hand, if the width dimension is too large, the handling may be hindered, and the locking operation becomes difficult. Therefore, the width dimension of the latching section 16, the block support arm 18, and the guide arm 20 is extended over the entire length. : B is preferably set to 50 mm ≧ B, and more preferably 30 mm ≧ B.

  Moreover, it is desirable to change the radius of curvature of the latching portion 16 according to the outer diameter dimension of the reinforcing bar to be latched. For example, a plurality of types having different curvature radii of the latching portion 16 are prepared in advance. It is also effective. However, since the latching portion 16 is formed of a metal plate, a slight discrepancy with the outer diameter of the reinforcing bar can be dealt with by deforming the latching portion 16 in the field.

  Furthermore, it is desirable that the longitudinal dimension of the block support arm 18 is set in accordance with the arrangement pitch of the reinforcing bars so that the proximal end portion of the spacer block 14 is supported by the reinforcing bars, for example, the longitudinal dimension is varied. It is also effective to prepare a plurality of types including the block support arm 18 in advance. However, since the concrete formwork spacer 10 can be stabilized even by mounting the block support arm 18 in a state where the intermediate portion in the longitudinal direction is supported by a reinforcing bar, the length of the minimum bar arrangement pitch is exceeded. For example, you may make it use the block support arm 18 which has the length of 2 times or 3 times or more generally with respect to the arrangement | positioning of various reinforcing bar intervals.

  Next, FIGS. 8 to 15 show a concrete mold spacer 40 as a second embodiment. In addition, in this embodiment, about the member and site | part made into the structure similar to 1st embodiment, respectively, the detailed description is given by attaching | subjecting the code | symbol same as 1st embodiment in a figure, respectively. Omitted.

  That is, the concrete formwork spacer 40 of this embodiment has the locking piece 42 by the block support arm 18 at the lower end of the block support arm 18 as compared with the concrete formwork spacer 10 of the first embodiment. Integrally formed.

  Here, in the present embodiment, as shown in FIG. 15, the concrete formwork spacer 40 is attached to the reinforcing bar by hooking and supporting the hooking portion 16 to the upper reinforcing bar 32, while the reinforcing bar contact portion 28 is lower. While being brought into contact with the reinforcing bar 34, the locking piece 42 is locked to the lower reinforcing bar 34. In addition, the mold contact surface 30 and the mold contact part 24 are in contact with the inner surfaces of the molds 36 and 38, respectively. Note that the locking piece 42 may be deformed so as to be wound around the outer periphery of the lower reinforcing bar 34 by applying an external force manually after being locked to the lower reinforcing bar 34 at the site. It is possible to obtain strength.

  Also in the concrete mold spacer 40 having such a configuration, the same effect as that of the concrete mold spacer (10) of the first embodiment can be obtained. In addition, by locking the locking piece 42 to the lower rebar 34, when the rotational force with the upper rebar 32 as the rotation axis is applied, it is possible to prevent the protruding tip of the spacer block 14 from shifting upward, It is possible to hold the installation position and installation direction of the concrete mold spacer 40 more stably.

  Specifically, by engaging the locking piece 42 with the lower rebar 34, the upper rebar 32 is guided to the latching portion 16 by the expanded portions of the block support arm 18 and the guide arm 20, thereby It can be easily attached by being hooked and supported by the upper rebar 32 by the stopper 16. Further, in the concrete placing process, even when an external force acts on the concrete mold spacer 10, the latching by the latching part 16, the latching by the latching part 22, and the contact by the reinforcing bar abutting part 28. It is possible to hold the installation position and the installation direction stably by being firmly attached to the bar arrangement.

  Subsequently, FIG. 16 shows a concrete mold spacer 50 as a third embodiment. In addition, in this embodiment, about the member and site | part made into the structure similar to 1st embodiment, respectively, the detailed description is given by attaching | subjecting the code | symbol same as 1st embodiment in a figure, respectively. Omitted.

  That is, the concrete mold spacer 50 of this embodiment has spacer blocks 52 on both sides in the plate thickness direction of the block support arm 18 as compared with the concrete mold spacers 10 and 40 of the first to second embodiments. It is protruding. Further, fixing portions 54 and 56 are formed integrally with the block support arm 18 at the lower end portion of the block support arm 18, and the spacer block 52 is fixed to the fixing portions 54 and 56 so that the spacer block 52 is fixed. Is attached to the lower end of the block support arm 18.

  Here, in this embodiment, as shown in FIG. 16, it is possible to position and support the molds 36 and 38 at the same time. As a result, the cover thicknesses on both sides of the bar arrangement can be set with high accuracy with approximately half the number of spacers used, the amount of work can be reduced, and the construction period can be shortened.

  As mentioned above, although several embodiment of this invention has been explained in full detail, these are illustrations to the last, and this invention is not interpreted at all by the specific description in this embodiment at all.

  For example, in the embodiment described above, the spacer block 14 has a substantially cylindrical shape in the horizontal direction, but the shape of the spacer block 14 is not limited to that of the present embodiment. Specifically, for example, a rectangular parallelepiped spacer block may be used.

  Furthermore, in the first to second embodiments, the spacer block 14 is formed so as to protrude toward the side opposite to the arrangement direction of the guide arm 20, but for example, it may be formed to protrude on the same side. A structure as shown in FIG. 17 may be adopted.

  Further, in the second embodiment, the locking piece 42 is provided separately from the bent portion 26 at the lower end of the block support arm 18, but for example, as shown in FIG. A configuration in which the exposed portion is exposed to the outside of the spacer block 14 and the exposed portion is used as a locking piece can also be suitably employed.

  Furthermore, in the second embodiment, the locking piece 42 is bent along the outer peripheral surface of the lower rebar 34 and is locked to the lower rebar 34 so that the installation position and the installation direction are in the desired state. Although held, the locking piece 42 does not necessarily have to be locked to the lower reinforcing bar 34. Specifically, for example, a structure as shown in FIG. 19 is preferably employed. That is, it is possible to realize the holding of the installation position and the installation direction by bending the locking piece 42 in the direction opposite to the protruding direction of the spacer block 14 and supporting the tip thereof in contact with the inner surface of the mold 38.

  Furthermore, in the third embodiment, the fixing portions 54 and 56 are formed integrally with the block support arm 18 at the lower end portion of the block support arm 18, but the shape of the lower portion of the block support arm 18 is the same as that of this embodiment. It is not limited. Specifically, for example, a configuration in which a locking piece 58 is further formed at the lower end of the block support arm 18 may be employed. That is, as shown in FIG. 21, the spacer block 52 fixed to the fixing portions 54, 56 is protruded on both sides in the plate thickness direction of the block support arm 18, and the locking piece 58 is positioned below the spacer block 52 in the lower stage. Lock to the rebar 34. This not only shortens the work time by reducing the number of necessary spacers, but also obtains the desired set cover thickness with higher accuracy by more stably and firmly fixing the installation position and installation direction. It becomes possible.

  Further, in the above-described embodiment, the mode in which the molds are arranged on both sides of the reinforcing bar has been described. However, for example, only one side is used to construct a concrete wall for slope protection or to place a slab. The concrete mold spacer and the method of the present invention, which are structured according to the present invention, can also be applied to the production of the concrete structure composed of the mold.

  Furthermore, the block support arm in the present invention does not necessarily extend linearly over the entire length. For example, the block support arm shown in FIG. 3 is curved near the tip of the block support arm 18 of the concrete mold spacer 10. As shown in FIG. 21, the reinforcing bars 32, 32 arranged in the horizontal direction are used instead of the reinforcing bars arranged vertically and vertically, and the reinforcing bars 32, 32 are horizontally straddled between the reinforcing bars 32, 32. It is also possible to realize a concrete mold spacer 60 that is locked in this manner. In FIG. 21, the same reference numerals as those of the first embodiment are assigned to members and parts having the same structure as that of the first embodiment, and detailed description thereof is omitted.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is a front view which shows the spacer for concrete formwork as 1st embodiment of this invention. It is a rear view which shows the spacer for concrete formwork shown by FIG. It is a right view which shows the spacer for concrete formwork shown by FIG. It is a top view which shows the spacer for concrete formwork shown by FIG. It is a bottom view which shows the spacer for concrete formwork shown by FIG. It is a perspective view which shows the spacer for concrete forms shown by FIG. It is a side view which shows the attachment state of the spacer for concrete formwork shown by FIG. It is a front view which shows the spacer for concrete formwork as 2nd embodiment of this invention. It is a rear view which shows the spacer for concrete formwork shown by FIG. It is a right view which shows the spacer for concrete formwork shown by FIG. FIG. 8 is a left side view showing the concrete formwork spacer shown in FIG. 7. It is a top view which shows the spacer for concrete formwork shown by FIG. It is a front view which shows the spacer for concrete formwork shown by FIG. FIG. 8 is a perspective view showing the concrete mold spacer shown in FIG. 7. It is a side view which shows the attachment state of the spacer for concrete formwork shown by FIG. It is a side view which shows the attachment state of the spacer for concrete formwork as 3rd embodiment of this invention. It is a side view which shows the attachment state of one specific example in the spacer for concrete formwork in the 1st and 2nd embodiment of this invention. It is a side view which shows the attachment state of one specific example of the spacer for concrete formwork as 2nd embodiment of this invention. It is a side view which shows the attachment state of another specific example of the spacer for concrete formwork as 2nd embodiment of this invention. It is a side view which shows the attachment state of another specific example of the spacer for concrete formwork as 3rd embodiment of this invention. It is a side view which shows the example of an attachment state of the spacer for concrete formwork as another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Spacer for concrete formwork 12 Support plate metal fitting 14 Spacer block 16 Latching part 18 Block support arm 20 Guide arm 26 Adhering part 32 Upper rebar 34 Lower rebar 36 Formwork 38 Formwork

Claims (8)

A support plate fitting having a longitudinal plate shape with a predetermined width is bent back in the middle in the longitudinal direction to form a latching portion, while the block support arm and the block support arm are formed by a pair of folded portions extending from the latching portion. the guide arm is formed, which is a fixed portion longitudinally under ends are brought bent at a substantially right angle of the block support arm is fixed concrete spacer blocks relative to the solid deposition section the while the spacer blocks are caused to protrude substantially at right angles from the longitudinal lower edge portion of said block support arm, which is the enlarging shape away from the said block support arm the guide arm toward the longitudinal distal end side, It is hooked supported by the upper reinforcing bars to guide the upper reinforcing bar against該掛stopper portion by the guide arm and expanded portions of said block support arm Together has become possible way, it is to position the concrete form and said spacer block is made to protrude by setting the head thickness from reinforcement surface rebar Under these engaging supporting state by projecting distal end face of the spacer block Furthermore, the support plate bracket is positioned below the upper rebar by projecting from the lower end in the longitudinal direction of the block support arm to which the spacer block is fixed and applying external force manually. And a locking piece that can be deformed so as to be wound around an outer periphery of a lower reinforcing bar that extends in the horizontal direction together with the upper reinforcing bar, and is integrally formed with a locking piece that is locked to the lower reinforcing bar . spacer. The spacer for a concrete formwork according to claim 1, wherein an opening portion of the latching portion is narrowed so that a gap size of the opening portion of the latching portion is smaller than an outer diameter size of the reinforcing bar. 3. The concrete mold according to claim 1, wherein a protruding tip end portion of the guide arm is brought into contact with a concrete mold frame in a state in which the latching section is latched and supported by the reinforcing bar. Frame spacer. The spacer for a concrete mold according to any one of claims 1 to 3 , wherein a protruding front end surface of the spacer block is a flat surface. The concrete formwork spacer according to any one of claims 1 to 4 , wherein the spacer block is formed so as to project toward the side opposite to the side on which the guide arm is disposed with respect to the support arm. The spacer for a concrete mold according to any one of claims 1 to 5 , wherein the spacer block is formed so as to protrude toward both sides of the block support arm in the plate thickness direction. In the state under which allowed hooking supports the hook portion to said reinforcing bar, wherein is the length of the block support arm designed to near the bottom end of the block support arm is positioned superimposed on another rebar The spacer for concrete molds according to any one of claims 1 to 6 . When manufacturing a reinforced concrete structure by driving a concrete material into a concrete placement space formed by arranging a concrete formwork on the outside where a plurality of reinforcing bars are assembled and arranged,
The concrete formwork spacer according to any one of claims 1 to 7 is hooked on the upper rebar with respect to the reinforcing bar, and horizontally with the upper rebar below the upper rebar. The locking part is attached to the lower reinforcing bar extending for walking by being manually wound to apply the external force , and the protruding front end surface of the spacer block of the concrete mold spacer is attached to the concrete. The concrete formwork is positioned at a predetermined distance from the reinforcing bar by contacting the inner surface of the formwork to form the concrete placement space, and concrete material is driven into the concrete placement space. The manufacturing method of the reinforced concrete structure characterized by these.

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