JP6865883B1 - Holder for sleeve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holder for a sleeve capable of ensuring a concrete cover thickness required for a reinforcing bar in the immediate vicinity of the sleeve at a place where a sleeve for forming a piping passage is installed at a reinforcing bar assembly construction site of a reinforced concrete structure. To do. SOLUTION: A separating frame portion 1 bent and formed in a U shape to separate an outer peripheral side surface of a sleeve 6 and a reinforcing bar 71 at a predetermined interval, and extending outward at one end side in the longitudinal direction of the separating frame portion 1. A presser plate-shaped portion provided on the inner side in the width direction of the separation frame portion 1 and parallel to and facing the main contact plate-shaped portion, and capable of sandwiching the peripheral wall of the opening of the sleeve 6. And a seat plate portion 5 provided at the end portion in the longitudinal direction of the main contact plate-shaped portion and having a surface orthogonal to the longitudinal direction. [Selection diagram] Fig. 1

Description

According to the present invention, at a reinforced concrete rebar assembly construction site, at a sleeve installation location for forming a pipe passage on a floor or a wall, the sleeve is separated from the nearest rebar and a concrete cover required for the rebar near the sleeve. Regarding a holder for a sleeve that can secure a thickness.

At the construction site of a reinforced concrete building, many pipes having various purposes such as a water supply / drainage system or an electrical wiring system are installed on the floor or wall. Pipes having such various purposes include vertical or horizontal pipes that penetrate floors, ceilings, and walls. Therefore, even at a construction site, a passage for arranging pipes on the floor, ceiling, and wall, that is, a pipe passage must be provided in advance.

Then, the floor is constructed with the slab as a reinforced concrete structure. The slab is provided with a skeleton of reinforcing bars, and as a general rule, piping passages must be constructed without damaging the reinforcing bars. The walls are also made of reinforced concrete. Furthermore, it is extremely important in this construction that when a pipe passage is formed on the floor slab or wall, the reinforcing bars placed in the immediate vicinity of the pipe passage are not provided with the required thickness of cover. It should not be done.

That is, it is important whether or not the reinforcing bars in the immediate vicinity of the piping passage are sufficiently covered with concrete. If the required amount of cover thickness for the reinforcing bar is not provided, rust, corrosion, and cracks in the concrete of the reinforcing bar will cause damage such as deterioration of the strength of the slab after a long period of time. The cover thickness of this reinforcing bar is specified by the Building Standards Law, and the amount of thickness specified here must be observed.

At present, in the construction of a pipe passage, a sleeve is often used as a formwork material for forming the pipe passage. Further, as this sleeve, a void sleeve (also referred to as a void tube) is often used. In the step of slab construction, in the step before the ready-mixed concrete is poured, the void sleeve is arranged at a preset predetermined position of the reinforcing bar frame and fixed by various fixing means. Then, after the ready-mixed concrete is cast and hardened, the void sleeve is removed and a piping passage is formed in the slab.

Here, as described above, the cover thickness of the reinforcing bar must be sufficiently secured in accordance with the Building Standards Act. Therefore, in the construction of slabs or walls for constructing floors, ceilings, etc., when the sleeve is placed at a predetermined position of the reinforcing bar frame, the above-mentioned necessary cover is placed between the sleeve and the reinforcing bar located immediately near the outer circumference of the sleeve. An appropriate separation distance must be provided to ensure the thickness. This appropriate separation distance depends on the individual technical skills of the field workers, and also depends on the management ability of the supervisor who manages the field, and further, the cover thickness in the work. The work process to secure the work is added, which is a cause of hindering work efficiency.

Japanese Unexamined Patent Publication No. 2010-1703

In order to solve such a problem, there are various inventions in which the cover thickness of the reinforcing bar can be secured. A representative of this type is referred to as Patent Document 1 (Japanese Unexamined Patent Publication No. 2010-1703). Patent Document 1 discloses a sleeve holder, which is fixed to the reinforcing bar by utilizing surrounding reinforcing bars, and then the sleeve is mounted on the sleeve mounting portion of the sleeve holder. As a result, the sleeve is installed adjacent to the surrounding reinforcing bars at a predetermined interval.

In Patent Document 1, according to such a configuration, the installation position of the sleeve is determined by the position of the surrounding reinforcing bar. Therefore, it may be difficult to install the sleeve at a preset position of the piping passage. Further, in Patent Document 1, since the sleeve holder is attached by various fixing means using the reinforcing bar located in the immediate vicinity, the work of installing the sleeve holder on the reinforcing bar arranged in advance becomes troublesome and difficult. It may deteriorate work efficiency.

An object (technical problem to be solved) of the present invention is a sleeve installation location for forming a piping passage in a reinforced concrete reinforcing bar assembly construction site, where the sleeve is separated from the nearest reinforcing bar and is close to the sleeve. It is an object of the present invention to provide a holder for a sleeve capable of ensuring a necessary and sufficient cover thickness of concrete for a reinforcing bar.

Therefore, as a result of diligent research to solve the above problems, in the invention of claim 1, the inventor has a reinforcing bar for a reinforced concrete floor slab or a cylindrical sleeve as a mold material for forming a piping passage in a wall. A holder for separating the reinforcing bars constituting the frame by a predetermined interval, the separating frame portion formed by bending the outer peripheral side surface of the sleeve and the reinforcing bars in a U-shape to be separated by a predetermined interval, and the separating frame portion. The sleeve is provided on one end side in the longitudinal direction and extending outward, and on the inner side in the width direction of the separation frame portion and parallel to and facing the main contact plate-shaped portion. Holding for a sleeve provided with a holding plate-shaped portion capable of sandwiching the peripheral wall of the opening and a seat plate portion provided at the longitudinal end portion of the main contact plate-shaped portion and having a surface orthogonal to the longitudinal direction. The above problem was solved by using the tool.

According to the invention of claim 2, in the holder for the sleeve according to claim 1, a sub-contact plate-like portion capable of contacting the outer peripheral side surface of the sleeve is provided on the other end side of the separation frame portion in the longitudinal direction. The above-mentioned problems have been solved by using the holder for the sleeve. According to the invention of claim 3, in the holder for the sleeve according to claim 1 or 2, a bent end edge bent toward the main contact plate-shaped portion is provided at the tip of the holding plate-shaped portion. The above problem was solved by using a sleeve holder having a triangular shape at the tip of the bent end edge.

According to the invention of claim 4, in the holder for the sleeve according to claim 1 or 2, the presser plate-shaped portion has a dogleg shape that becomes convex toward the main contact plate-shaped portion, and the convex shape thereof. The above problem was solved by using a holder for the sleeve in which the bent portion is close to the main contact plate-shaped portion. The invention of claim 5 is the holder for the sleeve according to any one of claims 1, 2, 3 or 4, wherein the holding plate-shaped portion is a holder for the sleeve as one. Solved the above-mentioned problems.

The invention of claim 6 is the holder for the sleeve according to any one of claims 1, 2, 3 or 4, wherein the holding plate-shaped portion is a holder for the sleeve to be two. Solved the above-mentioned problems. According to the invention of claim 7, in the holder for the sleeve according to any one of claims 1, 2, 3, 4, 5 or 6, the seat plate portion is outward in the width direction of the separation frame portion. The above-mentioned problems have been solved by using a holder for a sleeve having a structure that protrudes toward. According to the invention of claim 8, in the holder for the sleeve according to any one of claims 1, 2, 3, 4, 5 or 6, the seat plate portion is inward in the width direction of the separation frame portion. The above-mentioned problems have been solved by using a holder for a sleeve having a structure that protrudes toward.

In the invention of claim 1, a separating frame portion formed by bending in a U shape for separating the outer peripheral side surface of the sleeve and the reinforcing bar by a predetermined distance, and the separating frame portion extending outward at one end side in the longitudinal direction. A presser plate-shaped portion provided on the inner side in the width direction of the separation frame portion and parallel to and facing the main contact plate-shaped portion with the main contact plate-shaped portion and capable of sandwiching the peripheral wall of the opening of the sleeve. And a seat plate portion provided at the end portion in the longitudinal direction of the main contact plate-shaped portion and having a surface orthogonal to the longitudinal direction.

With the above configuration, by mounting and arranging a plurality of holders at predetermined intervals along the circumferential direction of the sleeve, the sleeve is placed at a predetermined position of the reinforcing bar frame installed at the floor slab or the wall construction site. Can be separated from the reinforcing bar located in the immediate vicinity thereof. Further, by setting the amount of protrusion of the separation frame portion from the outer peripheral side surface of the sleeve to be equal to the required cover thickness for the reinforcing bar, it is possible to secure the required cover thickness for the reinforcing bar after concrete placement. In addition, the holder is attached to the sleeve side, and the degree of freedom of the installation position should be ensured within the range where the holder attached to the sleeve does not come into contact with the reinforcing bar of the reinforcing bar frame of the floor slab or the wall construction site. Can be done.

In the invention of claim 2, a sub-contact plate-like portion capable of contacting the outer peripheral side surface of the sleeve is provided on the other end side of the separation frame portion in the longitudinal direction. The wearing state of the can be made extremely stable. In the invention of claim 3, the tip of the holding plate-shaped portion is provided with a bent end edge bent toward the main contact plate-shaped portion, and the tip of the bent end edge is formed in a triangular shape. As a result, it can be attached extremely firmly to the sleeve, and it is possible to prevent the sleeve and the holder from separating when placing ready-mixed concrete in slab construction.

In the invention of claim 4, the presser plate-shaped portion has a dogleg shape that becomes convex toward the main contact plate-shaped portion, and the convex bent portion is close to the main contact plate-shaped portion. The main contact plate-shaped portion and the holding plate-shaped portion form a substantially clip-like structure, and the holder can be attached to the sleeve extremely easily. In the invention of claim 5, since the holding plate-like portion is one, the sleeve can be easily removed after the floor slab or the wall construction is completed.

In the invention of claim 6, since the holding plate-like portion has two, the holder can be firmly attached to the sleeve. According to the invention of claim 7, the seat plate portion is configured to project outward in the width direction of the separation frame portion, so that the floor slab or the inside of the piping passage after the sleeve is removed after the wall construction is completed. You can make good laps. In the invention of claim 8, the seat plate portion is configured to project inward in the width direction of the separation frame portion, so that the piping is provided in the horizontal piping passage formed after the construction of the wall is completed. When installed horizontally, the seat plate portion can be used to prevent the piping from coming into contact with the inner peripheral surface of the piping passage.

In the holder, if the separating frame portion is provided with a rib for reinforcement, the holder has even greater durability against a force in a direction orthogonal to the longitudinal direction of the holder. Therefore, when a ribbed holder is attached to the floor slab or the place where the wall is to be constructed, even if the flow pressure at the time of placing is large in the process of placing the ready-mixed concrete, The retainer can withstand and protect the sleeve.

(A) is a perspective view installed at a predetermined position of a reinforcing bar frame at a place where a floor slab is to be constructed using the holder of the first embodiment, and (B) is a plan view of (A). (A) is a front view of the holder of the first embodiment, (B) is a side view seen from the inside of (A), (C) is a cross-sectional view taken along the line X1-X1 of (A), (D). ) Is a perspective view of the first embodiment of the holder, and (E) is an enlarged view of the part (α) of (D). (A) is a perspective view of the holder of the first embodiment having two pressing plate-shaped portions, and (B) is an enlarged plan view of a main part having a partial cross section in a state where the holder of (A) is attached to a sleeve. (C) is a perspective view having a modified example of a holding plate-like portion in the holder of the first embodiment, (D) is an enlarged view of (β) portion of (C), and (E) is (C). It is the enlarged sectional view of the main part in the state which the holder is attached to the sleeve. (A) is a vertical sectional front view in which the holder of the first embodiment is to be attached to the sleeve, (B) is an enlarged cross-sectional view of a main part with the holder attached, and (C) is X2-X2 of (B). A cross-sectional view taken along the arrow, (D) is a perspective view in which a holder is attached to the sleeve. (A) is a cross-sectional view of a state in which the sleeve equipped with the holder of the first embodiment is installed at a place where the floor slab is to be constructed, and (B) is a cross-sectional view in which the sleeve is removed to form a piping passage in the floor slab. It is a cross-sectional view of the state. (A) is a perspective view of a state in which the sleeve equipped with the holder of the second embodiment is installed at a place where the wall is to be constructed, and (B) is an attempt to attach the holder of the second embodiment to the sleeve. It is a vertical sectional front view. (A) is a vertical sectional front view of the holder of the second embodiment, (B) is a perspective view of the holder of the second embodiment, (C) is an enlarged view of the (γ) portion of (B), and (D) is. An enlarged perspective view of a main part as a modified example of the holder of the second embodiment, (E) is an enlarged perspective view of a part as another modified example of the holder of the second embodiment. (A) is a cross-sectional view of a state in which a sleeve equipped with the holder of the second embodiment is installed at a place where a wall is to be constructed, and (B) is a cross-sectional view in which the sleeve is removed to form a piping passage in the wall and piping. A cross-sectional view of a state in which piping is installed in the passage, (C) is a view taken along the line Y1-Y1 of (B). (A) is a front view of an embodiment in which ribs are provided in a separating frame portion of a holder, (B) is a Y2-Y2 arrow view of (A), and (C) is a Y3-Y3 arrow view of (B). A cross-sectional view, (D) is a perspective view of an embodiment in which ribs are provided in a separation frame portion of a holder, and (E) is an enlarged view of a portion (δ) of (D).

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The holder for the sleeve in the present invention serves to separate the cylindrical sleeve as a mold material for forming the piping passage in the floor slab 7 made of reinforced concrete from the reinforcing bars constituting the reinforcing bar frame of the floor slab 7 at a predetermined interval. It is something to do.

There are two embodiments of the holder A for the sleeve in the present invention. Explaining the configuration common to the two embodiments, the holder A may be formed of a metal material, a synthetic resin, or the like. In particular, when the holder A is made of metal, it is preferably a metal material that does not easily rust, and specifically, stainless steel or the like is used. The main configuration of the holder A includes a separation frame portion 1, a main contact plate-shaped portion 2, a sub-contact plate-shaped portion 3, a holding plate-shaped portion 4, and a seat plate portion 5 ( (See FIGS. 2 and 7).

The holder A has a reference indicating a direction, and a longitudinal direction and a width direction are used. The longitudinal direction of the holder A is the direction along the shaft core wire 6L passing through the center of the diameter of the sleeve 6 with the holder A properly attached to the cylindrical sleeve 6 (FIGS. 4 and 6). reference). Further, the width direction of the holder A is a direction orthogonal to the longitudinal direction, and the center of the diameter of the sleeve 6 and the mounting location of the holder A when the holder A is properly mounted on the cylindrical sleeve 6. It is a direction along the diameter direction passing through (see FIGS. 4 and 6).

That is, the longitudinal direction of the holder A is the direction parallel to the shaft core wire 6L of the sleeve 6, and the width direction of the holder A is the direction orthogonal to the shaft core wire 6L of the sleeve 6. Then, in the width direction of the holder A, with the holder A properly attached to the sleeve 6, the side on which the sleeve 6 is located is the inner side, and the position on the opposite side is the outer side.

Regarding whether the longitudinal direction and the width direction of the holder A are vertical or horizontal, when the pipe passage 7h is formed in the floor slab 7 by using the sleeve 6, the floor slab 7 becomes the floor (ceiling). The direction is different from the case and the wall 7W. When the floor slab 7 is the floor (ceiling), in principle, the axis 6L of the sleeve 6 is vertical, the longitudinal direction of the holder A is vertical, and the width direction is horizontal [FIGS. 1 (A), FIG. 4, see FIG. 5 (A), etc.]. Further, in the case of the wall 7W, in principle, the shaft core wire 6L of the sleeve 6 is horizontal, the longitudinal direction of the holder A is horizontal, and the width direction is vertical (see FIGS. 6 and 8). Hereinafter, in the description, the above-mentioned longitudinal direction and width direction will be used as reference for the description of each part of the holder A.

First, the first embodiment of the holder A will be described. The separation frame portion 1 has a lower piece 11, an upper piece 12, and a vertical separation piece 13, and the separation frame portion 1 is substantially. It constitutes a "U" shape [see FIGS. 2 (A), 2 (D), 3 (C), etc.]. Further, depending on the viewing direction of the holder A, the substantially "U" shape of the separation frame portion 1 may be an inverted "U" shape, which is also included in the substantially "U" shape.

Therefore, the horizontal lower piece 11 is formed in the width direction from the lower side with the longitudinal direction of the holder A arranged vertically, and the vertical separating piece 13 is formed upward from the outer side end in the width direction of the lower piece 11. It is formed, and a horizontal upper piece 12 is formed from the upper end in the longitudinal direction of the vertical separating piece 13 toward the inward side in the width direction (see FIG. 2). The lower piece 11 and the upper piece 12 have the same length and are parallel to each other. Further, the lower piece 11 and the upper piece 12 are substantially parallel and have substantially the same length, and some of them have a slight dimensional difference.

When the piping passage 7h is formed in the floor slab 7, the separation frame portion 1 serves to sufficiently secure the inner peripheral surface of the piping passage 7h and the covering thickness of the reinforcing bar 71 of the reinforcing bar frame constituting the floor slab 7. Has (see FIG. 5). The amount of the cover thickness K in which the reinforcing bar 71 is embedded in the concrete 73 is stipulated in the Building Standards Law, and the lengths of the lower piece 11 and the upper piece 12 of the separation frame portion 1 are determined accordingly. To.

The vertical separating piece 13 is straight and vertical with the longitudinal direction of the holder A set to be vertical. Further, the vertical separating piece 13 includes a substantially vertical one and a slightly inclined one. Further, the vertical separating piece 13 includes a substantially linear shape having an arc shape having a slight bulge on the inner side or the outer side in the width direction. The separation frame portion 1 is formed of a flat band-shaped metal plate material (which may be a synthetic resin), and the lower piece 11, the upper piece 12, and the vertical separation piece 13 are bent by metal processing or the like to form a substantially U shape. To form.

Next, the main contact plate-shaped portion 2 is formed so as to extend outward at one end side in the longitudinal direction of the separation frame portion 1 (see FIG. 2). The main contact plate-shaped portion 2 has a linear and flat face plate shape along the longitudinal direction. Specifically, the main contact plate-shaped portion 2 is formed of a flat band-shaped metal plate material, and faces outward in the longitudinal direction of the separating frame portion 1 from the inner side end portion of the lower piece 11 of the separating frame portion 1. Therefore, it is formed extending so as to form a substantially right angle with the lower piece 11. The main contact plate-shaped portion 2 is integrally formed with the separation frame portion 1 by metal processing. The main contact plate-shaped portion 2 abuts on the outer peripheral side surface of the sleeve 6 when the holder A is attached to the sleeve 6, and has a role of sandwiching the opening peripheral wall 6t of the sleeve 6 together with the pressing plate-shaped portion 4 described later. [See FIGS. 4 (B) and 4 (C)].

Further, on the other end side of the separation frame portion 1 in the longitudinal direction, a sub-contact plate-like portion 3 is formed toward the outward side in the longitudinal direction of the separation frame portion 1 (see FIG. 2). The sub-contact plate-like portion 3 has a linear and flat face plate shape along the longitudinal direction. Specifically, the sub-contact plate-shaped portion 3 is formed of a flat band-shaped metal plate material, and faces outward in the longitudinal direction of the separating frame portion 1 from the inner side end portion of the upper piece 12 of the separating frame portion 1. Therefore, it is extended so as to form a substantially right angle with the upper piece 12.

The sub-contact plate-shaped portion 3, together with the main contact plate-shaped portion 2, abuts on the outer peripheral side surface of the sleeve 6 to support the sleeve 6 [FIGS. 4 (A), (D), 5]. (A)]. Therefore, it is preferable that the sub-contact plate-shaped portion 3 is set to be flush with the main contact plate-shaped portion 2 along the longitudinal direction. The sub-contact plate-shaped portion 3 is formed with fixing holes 3a for fixing tools such as screws and nails for contacting and fixing to the outer peripheral side surface of the sleeve 6. The fixing hole 3a is not always necessary and may not be formed.

Next, the presser plate-shaped portion 4 is provided as a portion constituting the holder A so as to be located inward of the main contact plate-shaped portion 2 in the width direction of the separation frame portion 1 (). (See FIG. 2). The presser plate-shaped portion 4 is a plate piece-shaped portion provided in a rising shape toward the separation frame portion 1 side along the longitudinal direction of the holder A.

More specifically, the main contact plate-shaped portion 2 is continuously formed via a continuous piece 4a protruding inward from the outer end in the longitudinal direction (see FIG. 2). Further, the pressing plate-shaped portion 4 is provided so as to be parallel (including substantially parallel) and facing the main contact plate-shaped portion 2. Then, as described above, the presser plate-shaped portion 4 has a role of sandwiching and fixing the opening peripheral wall 6t of the sleeve 6 together with the main contact plate-shaped portion 2 [see FIGS. 4 (B) and 4 (C)). ].

The presser plate-shaped portion 4 has a bent end edge 41 formed at the tip end in the longitudinal direction thereof. The bent end edge 41 is a small piece portion bent toward the main contact plate-shaped portion 2, and is formed in a triangular shape so as to be convexly pointed toward the main contact plate-shaped portion 2. [See FIGS. 2 (C), (D), (E), etc.]. The bent end edge 41 having a triangular pointed shape has the bent end edge 41 sandwiching the opening peripheral wall 6t of the sleeve 6 between the main contact plate-shaped portion 2 and the holding plate-shaped portion 4. The sleeve 6 has a structure that allows it to bite into the inner peripheral wall surface of the opening peripheral wall 6t [see FIGS. 4 (B) and 4 (C)]. When the bent end edge 41 bites into the inner peripheral wall of the sleeve 6, the mounting strength of the holder A on the sleeve 6 can be strengthened.

One presser plate-shaped portion 4 having the above-mentioned bent end edge 41 having a triangular tip is provided (see FIG. 2). Further, two presser plate-shaped portions 4 may be provided in parallel in a direction orthogonal to both the width direction and the longitudinal direction of the holder A [see FIGS. 3 (A) and 3 (B)]. In this case, it is preferable that the two pressing plate-shaped portions 4 and 4 are arranged at intervals in the width direction.

As a modification of the presser plate-shaped portion 4, the convex bent portion 42a is formed as a “dogleg” shape that becomes convex toward the main contact plate-shaped portion 2 [FIG. 3 (FIG. 3). See C), (D), (E)]. The convex bent portion 42a of the presser plate-shaped portion 4 is a bent line portion provided on the plate piece-shaped presser plate-shaped portion 4, and the “ku” of the presser plate-shaped portion 4 is provided via the convex bent portion 42a. It constitutes a character shape. The convex bent portion 42a is a portion of the holding plate-shaped portion 4 that is closest to the main contact plate-shaped portion 2.

Further, the convex bent portion 42a may come into contact with the main contact plate-shaped portion 2. Here, the "dogleg" shape of the presser plate-shaped portion 4 is also an inverted "dogleg" shape depending on the direction in which the holder A is viewed, and this shape is also included in the "dogleg" shape. In another embodiment of the presser plate-shaped portion 4, in the longitudinal direction of the presser plate-shaped portion 4, the main contact plate shape is formed from the root of the continuous piece 4a on the outer side from the position of the convex bent portion 42a. An elastic inclined piece 42b that inclines toward the portion 2 is provided, and an insertion guide piece 42c that gradually moves away from the main contact plate-shaped portion 2 on the inner side of the position of the convex bent portion 42a.

In the modified example of the holding plate-shaped portion 4, the elastic inclined piece 42b has a clip-like action of sandwiching the opening peripheral wall 6t of the sleeve 6 together with the main contact plate-shaped portion 2, and the insertion guide piece 42c , It serves as a guide for inserting the opening peripheral wall 6t of the sleeve 6 [see FIG. 3 (E)]. In this other embodiment, it becomes easy to perform the work of sandwiching the main contact plate-shaped portion 2 and the pressing plate-shaped portion 4 with the opening peripheral wall 6t of the sleeve 6. Further, although not shown, as a modification of another embodiment, in the holding plate-shaped portion 4, the convex bent portion 42, the elastic inclined piece 42b, and the insertion guide piece 42c are continuous, and the main contact plate-shaped portion 2 is formed. It may be formed in an arc shape or a curved shape that becomes convex toward.

Also in the presser plate-shaped portion 4 of this other embodiment, one or two may be provided for one holder A. When one pressing plate-shaped portion 4 is used, it is preferable that the pressing plate-shaped portion 4 has the same width as the main contact plate-shaped portion 2 (direction orthogonal to the longitudinal direction and the width direction). When two pressing plate-shaped portions 4 are used, it is preferable that each pressing plate-shaped portion 4 is set to have a width smaller than that of the main contact plate-shaped portion 2.

Next, the seat plate portion 5 is provided as a portion having a surface orthogonal to the longitudinal direction of the main contact plate-shaped portion 2 at the outer end portion in the longitudinal direction of the main contact plate-shaped portion 2. (See FIG. 2). Further, the seat plate portion 5 is configured to project outward in the width direction of the separation frame portion 1. Specifically, the seat plate portion 5 is formed in the shape of a flat surface plate provided in the holder A in the directions orthogonal to the longitudinal direction and the width direction, respectively, and located on both sides of the main contact plate-shaped portion 2. It is a part composed of two seat plate pieces 51 and 51 [see FIGS. 3 (A) to 3 (D)]. Specifically, it is a substantially U-shaped plate-shaped piece having a semicircular shape at the tip in the width direction, and a fixing hole 51a for fixing is formed at the tip portion thereof. The seat plate portion 5 is a portion formed extending from the position of the holding plate-shaped portion 4 in the width direction toward the outer side in the width direction.

Next, a second embodiment of the holder A will be described. In the second embodiment of the holder A, the configurations of the separation frame portion 1, the main contact plate-shaped portion 2, the sub-contact plate-shaped portion 3, and the holding plate-shaped portion 4 are substantially the same as those in the first embodiment. In the second embodiment, the seat plate portion 5 is configured to project inward in the width direction of the separation frame portion 1 (see FIG. 7).

That is, the seat plate portion 5 is a portion having a surface orthogonal to the longitudinal direction of the main contact plate-shaped portion 2 at the outer end portion in the longitudinal direction of the main contact plate-shaped portion 2. The width (orthogonal in the longitudinal direction and the width direction) of the portion 5 is set to be equal to or slightly smaller than that of the main contact plate-shaped portion 2. In the second embodiment, the presser plate-shaped portion 4 cuts a part of the seat plate portion 5 into the shape of the presser plate-shaped portion 4, and bends the cut portion so as to stand up to form the presser plate-shaped portion 4. [See FIGS. 7 (B) and 7 (C)].

Further, in the first embodiment and the second embodiment of the holder A, the separation frame portion 1, the main contact plate-shaped portion 2, the sub-contact plate-shaped portion 3, and the presser plate-shaped portion 4 constituting the holder A are formed. The seat plate portion 5 and the seat plate portion 5 can be integrally molded from one metal plate material by press working. However, the separating frame portion 1, the main contact plate-shaped portion 2, the sub-contact plate-shaped portion 3, the holding plate-shaped portion 4 and the seat plate portion 5 are used as separate members, and the holder is provided by welding or rivet or the like. It may also form the first and second embodiments of A.

Next, it will be described that the holder A in the present invention is used to install the sleeve 6 for constructing the piping passage 7h on the floor slab 7 or the wall 7W in the construction construction. First, a process of constructing the piping passage 7h on the floor slab 7 constituting the floor (including the ceiling) will be described. A frame with a large number of reinforcing bars 71 is constructed at a place where the floor slab 7 to be a floor is to be constructed [see FIGS. 1 and 5 (A)].

A formwork plate 72 is arranged below the skeleton, ready-mixed concrete is poured into the skeleton, and a floor slab 7 is constructed. As the sleeve 6 used as a mold material for forming the pipe passage 7h, a cylindrical body made of a thick paper material is generally used, and specifically, a void sleeve is generally used. The holder A in the present invention is also suitable for using a void sleeve as the sleeve 6.

A plurality of holders A are prepared and attached to the peripheral wall of the opening of the sleeve 6 [see FIG. 4 (D)]. Usually, it is preferable to attach four holders A to one sleeve 6 at equal intervals in the circumferential direction of the sleeve 6. This is because the reinforcing bars 71 are constructed so as to be orthogonal to each other like a grid, so that the reinforcing bars around the place where the sleeve 6 is arranged also form a substantially rectangular frame. [See FIG. 1 (B)]. Depending on the situation at the site, five or more holders A may be attached to one sleeve 6, or three or less holders A may be attached.

The full holder A is attached to the peripheral wall of the same opening of the sleeve 6. The holder A is attached so that the separation frame portion 1 projects substantially radially from the outer peripheral side wall of the sleeve 6, and the sleeve 6 is opened by the main contact plate-shaped portion 2 and the presser plate-shaped portion 4 of the holder A. The peripheral wall 6t is fixed so as to sandwich it. Then, the sleeve 6 to which the plurality of holders A are attached is arranged so that the axis core wire 6L is in the vertical direction in a predetermined space of the reinforcing bar frame and on the formwork plate 72 [FIGS. 1 (A), FIG. See 5 (A)].

Here, since the floor slab 7 constitutes the floor, the formwork plate 72 is a horizontal and flat surface [see FIGS. 1 (A) and 5 (A)]. The sleeve 6 is arranged so that the opening on the side where the holder A is mounted faces the formwork plate 72. Next, the seat plate portion 5 and the form plate 72 of the holder A mounted on the sleeve 6 are fixed with a fixing tool s such as a screw or a nail. Here, since the formwork plate 72 is removed at the final stage, the holder A and the formwork plate 72 can be easily removed.

Each holder A of the sleeve 6 arranged on the formwork plate 72 maintains a state in which the surrounding reinforcing bars 71 are separated from the sleeve 6 at a predetermined interval. The separation distance between the sleeve 6 and the reinforcing bar 71 is such that the cover thickness K specified by the Building Standards Act can be secured [see FIG. 5 (B)]. In this state, ready-mixed concrete is poured onto the formwork plate 72 to obtain a desired thickness of the floor slab 7. After the ready-mixed concrete is hardened, the sleeve 6 is removed from the concrete 73, and a pipe passage 7h is formed in the floor slab 7 constituting the floor and the ceiling [see FIG. 5 (B)]. At this time, the reinforcing bar 71 located around the piping passage 7h has a sufficient cover thickness K with respect to the concrete 73.

Next, a process of constructing the piping passage 7h on the wall 7W will be described (see FIGS. 6 and 8). First, the wall wall 7W is a vertical surface, and except for this point, it is substantially the same as the construction process in the case of the floor (ceiling). A frame with a large number of reinforcing bars 71 is constructed at a place where the wall wall 7W is to be constructed. A formwork plate 72 is arranged on one side of the frame, and a sleeve 6 to which a plurality of holders A are attached has a vertical surface-like formwork in a predetermined space of the reinforcing bar frame so that the axis core wire 6L thereof is in the horizontal direction. Arranged on the plate 72, each seat plate portion 5 of the holder A and the formwork plate 72 are fixed with a fixing tool s such as a screw or a nail.

Then, another formwork plate 72 for further pouring the ready-mixed concrete is arranged in a sandwich shape with respect to the previously installed formwork plate 72. In this state, ready-mixed concrete is poured onto the formwork plate 72 to form the piping passage 7h. Here, by using the holder A of the second embodiment, after the sleeve 6 is removed, the seat plate portion 5 is in a state of protruding into the passage near the opening of the piping passage 7h. By using these seat plate portions 5, the pipe 81 can be arranged horizontally in the horizontal pipe passage 7h.

Specifically, a hanger 82 including an annular support portion 82a that supports the pipe 81 so as to surround the outer circumference thereof and connecting portions 82b provided on the outer circumference thereof at equal intervals is provided. Then, the annular support portion 82a is attached so as to surround the outer circumference of the pipe 81, and the connecting portion 82b of the hanging tool 82 and the seat plate portion 5 of the holder A protruding from the inner peripheral side surface of the piping passage 7h are screwed. , Connect via a fixing tool s such as a nail.

The number of connecting portions 82b of the hanging tool 82 is the same as that of the holder A mounted in the piping passage 7h, and the distance between the connecting portions 82b is the same as the distance between the seat plate portions 5 of the holder A. The entire connecting portion 82b and the entire seat plate portion 5 are also positionally coincident with each other, and the connecting portion 82b and the seat plate portion 5 can be easily connected to each other. As a result, in the horizontal pipe passage 7h, the hanger 82 can prevent the pipe 81 from contacting the inner peripheral side surface of the pipe passage 7h, and align the diameter centers of the pipe 81 and the pipe passage 7h. , Can be arranged in an orderly manner [see FIGS. 8 (B) and 8 (C)].

In the first and second embodiments of the holder A, the separating frame portion 1 may be provided with reinforcing ribs r1, r2, r3, r4 and r5 (see FIG. 9). Specifically, the lower piece 11 of the separation frame portion 1 is provided with ribs r1 that are continuous in a bulging shape along the width direction thereof, and the upper piece 12 is continuously bulging out along the width direction. The rib r2 is provided, and the vertical separating piece 13 is provided with a rib r3 that is continuous in a bulging shape along the longitudinal direction thereof. The ribs r1, ribs r2, and ribs r3 are oval and flattened so as to project outward (or inward) in the width and longitudinal directions. [See FIGS. 9 (A) to 9 (D)].

Further, triangular ribs r4 are formed at the corners of the lower piece 11 and the vertical separating piece 13 and the upper piece 12 and the vertical separating piece 13. Similarly, triangular ribs r5 are formed at the corners of the main contact plate-shaped portion 2 and the lower piece 11 and the sub-contact plate-shaped portion 3 and the upper piece 12 [FIG. 9 (D). ), (E)]. These ribs r1 to r5 are preferably provided when the thickness of the metal material forming the holder A is thin (about 0.6 mm). As a specific example of the means for forming the rib r4 and the rib r5, those by bead processing are preferable.

By forming these ribs r1 to r5, the holder A has even greater durability against a force in the direction orthogonal to the longitudinal direction. Therefore, when the holder A with ribs (r1 to r5) is attached to the place where the floor slab 7 or the wall 7W is to be constructed, in the process of placing the ready-mixed concrete, even at the time of placing. Even if the flow pressure is high, the holder A can withstand and protect the sleeve 6.

In both the first embodiment and the second embodiment of the holder A, the sleeve 6 can be attached to either the floor slab 7 or the wall 7W. Further, when the metal sleeve 6 is used, it may be left as it is and used as the piping passage 7h without being removed after the construction of the floor slab 7 is completed.

The configuration of the ribs r1 to r5 will be described. In the holder A, the separation frame portion 1 is provided with reinforcing ribs r1, r2, r3 and r4, and the lower piece 11 of the separation frame portion 1 is provided. The upper piece 12 is provided with ribs r1 and r2 that are continuous in a bulging shape along the width direction thereof, and the vertical separating piece 13 is provided with ribs r3 that are continuous in a bulging shape along the longitudinal direction thereof. It is provided. Further, in the holder A, triangular ribs r4 and ribs r5 are formed at the corners of the lower piece 11 and the vertical separating piece 13 and the upper piece 12 and the vertical separating piece 13. ing.

A ... Holder, 1 ... Separation frame part, 2 ... Main contact plate-shaped part, 3 ... Sub-contact plate-shaped part, 4 ... Holding plate-shaped part,
5 ... Seat plate part.

Claims (8)

A holder for separating a reinforcing bar constituting a reinforcing bar frame from a cylindrical sleeve as a mold material for forming a piping passage in a reinforced concrete floor slab or a wall at a predetermined distance, and the outer peripheral side surface of the sleeve and the reinforcing bar. The width of the separation frame portion formed by bending in a U shape to separate the separation frames, the main contact plate-like portion extending outward at one end side in the longitudinal direction of the separation frame portion, and the width of the separation frame portion. A holding plate-shaped portion provided on the inner side in the direction and parallel to and facing the main contact plate-shaped portion so as to be able to hold the peripheral wall of the opening of the sleeve, and a longitudinal end portion of the main contact plate-shaped portion. A holder for a sleeve, which is provided with a seat plate portion provided on the slab and has a surface orthogonal to the longitudinal direction. The holder for a sleeve according to claim 1, characterized in that a sub-contact plate-like portion capable of contacting the outer peripheral side surface of the sleeve is provided on the other end side of the separation frame portion in the longitudinal direction. A retainer for the sleeve to be used. In the holder for a sleeve according to claim 1 or 2, a bent end edge bent toward the main contact plate-shaped portion is provided at the tip of the holding plate-shaped portion, and the bent end edge is provided. A holder for a sleeve, characterized in that the tip of the song is formed in a triangular shape. In the holder for the sleeve according to claim 1 or 2, the presser plate-shaped portion has a dogleg shape that is convex toward the main contact plate-shaped portion, and the convex bent portion is the main contact. A holder for a sleeve, which is characterized by being close to a contact plate. The holder for a sleeve according to any one of claims 1, 2, 3 or 4, wherein the holding plate-shaped portion is one. The holder for a sleeve according to any one of claims 1, 2, 3 or 4, wherein the holding plate-shaped portion is two. In the holder for the sleeve according to any one of claims 1, 2, 3, 4, 5 or 6, the seat plate portion is configured to project outward in the width direction of the separation frame portion. A holder for the sleeve, which is characterized by becoming. In the holder for the sleeve according to any one of claims 1, 2, 3, 4, 5 or 6, the seat plate portion is configured to project inward in the width direction of the separation frame portion. A holder for the sleeve, which is characterized by being

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