JP2013133691A - Covering depth maintaining member between mold frames and reinforcing-bar and concrete structure employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a covering depth maintaining member between mold frames and a reinforcing-bar for fixing covering depth between the reinforcing-bar disposed in a wall, a column or a beam of RC and the mold frames, and a concrete structure employing the member.SOLUTION: A covering depth maintaining member between mold frames and a reinforcing-bars is provided for fixing a distance between confronted mold frames and a reinforcing-bar therein, and comprises a pair of right and left spacers including sharpened part abutted to inner surfaces of the mold frames and coupling parts fitted to the reinforcing-bar closer to the mold frames and a connecting steel rod connecting the spacers, and a concrete structure employing the member is also provided.

Description

  The present invention relates to a cover thickness holding member between a formwork and a reinforcing bar used for RC walls, columns, or beams, and a concrete structure using the member.

  When making RC such as walls, columns or beams, there is a concrete placement spacer that makes the cover thickness from the concrete surface to the reinforcing bar constant when placing concrete after placing in the formwork. .

  In FIG. 12, which is currently used, when the spacer A having the kerf A-1 is inserted into the reinforcing bars B and F in the molds D and G of the wall (FIG. 13) and the beam (FIG. 14), The concrete is placed in the molds D and G in the longitudinal direction of the reinforcing bars against the ones that are installed crossing in the longitudinal direction of the reinforcing bars B and F. However, as shown in FIGS. 11 and 12 from the left (before placing) to the right (after placing) (arrows), the aggregates C-1 and C-2 are caught on the spacer A, and the concrete is placed. There is a risk of poor installation (junka).

  Moreover, if the invention of patent document 1 is demonstrated with the number in the document, the detachable fixing part (2) of the spacer (1) is fixed to the reinforcing bar (10a), and the shaft ( 8) A spacer (1) is disclosed in which a planar leg portion (9) (duck leg shape) at the tip thereof is planarly abutted against the inner surface of the mold (11).

In addition, as in the invention of Patent Document 2, a hoop line (a,... A) in which a spacer composed of a corner horizontal line connected to the upper and lower connection vertical lines (2, 3) having the cap (6) is crossed to the main line. _n ) There are some that are attached and fixed.

  However, one side part of the spacer of Patent Document 1 is fixed to the reinforcing bar (10a) by the attaching / detaching fixing part (2) and the leg part (9) of the other side part is not in contact with the mold frame (11). In addition, a separator (12) is installed between the opposing molds (11). Therefore, this structure requires a step in which a separator must be installed in addition to many materials, that is, the spacer (1). In addition, the concrete is placed to the lower position of the spacer (1) while burying the separator (12), and the spacer (1) is removed from the reinforcing bar (10a) so as not to be embedded in the concrete. There is a problem that the number of members is more than anything, and the process takes time.

And also, main reinforcement spacer of Patent Document 2, 3 and 4, the corner horizontal stripes (1) of the corner spacer (Fig. 1), upper and lower stages of the hoop (a, · · · a _n ), The gap between the upper and lower hoop muscles must be kept constant, resulting in a step difference in attachment, which makes it difficult to attach and makes the cover thickness with the mold B constant. The inconvenience that it is not possible arises.

JP 2011-196153 A Japanese Patent Application Laid-Open No. 08-120732

  The present invention solves the disadvantages of the conventional example. As a problem, the present invention not only provides a constant distance between the opposing molds, but also makes the cover thickness between the molds and the bar arrangement constant, and the molds. The cover thickness holding | maintenance part between a formwork and a reinforcing bar which made the location which contact | abuts to the smallest possible area, and a concrete structure using the same are provided.

  The gist of claim 1 according to the present invention is to provide a substantially pointed portion that abuts the inner surface of each opposing mold, and fits to the reinforcing bar closer to the mold among the reinforcing bars that cross vertically and horizontally within the mold The cover thickness holding member between the formwork and the reinforcing bar is composed of a pair of spacers having a connecting portion and a connecting steel rod connected between the spacers.

The invention of claim 2 can be easily fitted from the direction intersecting the reinforcing bars by making the coupling portion made of a synthetic resin having an elastic body. As the synthetic resin here, high-density polyethylene is preferably used.
Connecting steel bars can be integrated with concrete by selecting the same or similar materials as the reinforcing bars.

  According to the invention of claim 3, which is the present invention, in the mold, spacers on both sides of the connecting steel rod are brought into contact with the inner surface of the opposite mold in a point state, and the reinforcing bar crossing vertically and horizontally is attached to the mold. In the concrete structure, the coupling portion is fitted to the closer reinforcing bar, the cover thickness holding member is arranged between the opposing formwork and the reinforcing steel, and the concrete is placed in the formwork.

  Abutting the substantially pointed portion in a dot state does not mean that the tip of the spacer has no area but means that the abutting portion exists as a small planar shape.

  The invention of claim 4 is used for a wall, claim 5 is used for a column, and claim 6 is used for a beam.

According to the present invention, the cover thickness between the opposing mold and the rebar close to the mold is made constant, and the both sides of the connecting steel rod are brought into contact with the inner surface of the mold in a small area so that a jumper is not generated as much as possible. did.
In addition, by connecting the connecting part provided on the spacer only to the reinforcing bar closer to the form of the RC reinforcing bars, the connecting part crossed with the closer reinforcing bar, the remote reinforcing bar is also molded. It can be kept away from the frame side, and the concrete cover thickness of the opposing mold can be made constant by a simple and short operation.

It is a front view of the cover thickness holding member between a formwork and a reinforcing bar which is the present invention. It is a top view of FIG. It is a bottom view of FIG. It is a right view of FIG. It is a left view of FIG. It is sectional drawing of the front direction which used the cover thickness holding member between the formwork of FIG. 1 and a reinforcing bar for the wall. FIG. 7 is a bottom sectional view of FIG. 6. It is sectional drawing of the front direction using the cover thickness holding member between the formwork and reinforcing bar of FIG. 1 for the column. It is bottom sectional drawing which made FIG. 8 small and was able to understand the whole. FIG. 2 is a front cross-sectional view using a cover thickness holding member between the formwork and the reinforcing bar of FIG. It is bottom sectional drawing which made FIG. 10 small and was able to understand the whole. It is a front view of the conventional spacer. The spacer is correctly attached to the wall, the left side is before concrete placement, and the right side is an explanatory view of the state where the aggregate is caught on the spacer when the concrete is placed. The spacer is correctly attached to the beam, the left side is before placing concrete, and the right side is an explanatory view of the state where the aggregate when the concrete is placed is caught on the spacer.

The invention as the cover thickness holding member between the formwork and the reinforcing bar according to claim 1 is such that the coupling portion of the spacer is fitted to the reinforcing bar closer to the formwork among the reinforcing bars crossing vertically and horizontally in the formwork. So, it is possible to keep the distant reinforcing bar from approaching the formwork side.
In addition, the connecting steel bar in the center makes the cover thickness between the spacers on both sides and the mold frame constant by removing the mold frame by bringing the spacers on both sides into contact with the inner surface of the opposite mold frame in a small area. It is a beautiful finish on the concrete surface.

  The second aspect of the present invention makes it easy to fit the coupling portion of the spacer to the different diameter reinforcing bar by using a high-density polyethylene made of a synthetic resin having elasticity for the spacer.

In the invention of claim 3, the substantially pointed portions of the spacers on both sides of a connecting steel rod such as a round steel bar are brought into contact with the inner surface of the formwork in a point state, and the joint at the base of the spacer is fitted to the reinforcing bar. Then, the cover thickness holding member between the formwork and the reinforcing bar is arranged, and the concrete structure in which the concrete is placed in the formwork is finished.
The outer shape of the spacer in this case is such that the umbrella is closed. Therefore, unlike the conventional example, there is little mounting of a concrete aggregate (junker) thereon. In addition, as described above, the coupling portions of the spacers on both sides of the connecting steel rods are fitted to the reinforcing bars on the left and right mold frames, and the tips are brought into contact with the inside of the mold frames, so that the positions of the coupling portions of the spacers The distance from the tip, that is, the cover thickness is made constant.

  When the third aspect is used for the wall, the reinforcing bars intersecting with each other are formed by vertical bars and horizontal bars, and a cover thickness holding member between the formwork and the reinforcing bars is attached to the transverse bars opposite to the formwork.

  When the third aspect is used for the column, the reinforcing bars intersecting with each other are composed of main bars and hoop bars, and a cover thickness holding member between the mold frame and the reinforcing bars is attached to the hoop bars facing the mold frame.

  When the third aspect of the present invention is used for a beam, the abdominal muscles 24 and 25 and the stirrup muscles 22 and 23 or the beam muscles 26 and 27 and the stirrup muscles 22 and 23 are formed. A cover thickness holding member between the frame and the reinforcing bar is attached.

1 to 5 are a front view, a plan view, and a bottom view of a cover thickness holding member between a mold and a reinforcing bar of the present invention. On the left and right sides of the iron connecting steel rod 1 at the center, there are arranged spacers 2 and 3 having the same shape which are integrally formed of a synthetic resin made of high density polyethylene having elasticity.
The spacers 2 and 3 have round bases (the corners may be rounded corners) and become narrower as they go forward, and are generally umbrella-shaped, with reinforcing ribs 4 and 5 provided at the bottom of the bases, The substantially horseshoe-shaped coupling parts 6 and 7 having open ends on both sides are integrally provided on the outer reinforcing bar side.

Next, an embodiment in which the cover thickness holding members between the formwork and the reinforcing bars are respectively attached to walls, columns, and beams will be described.
The first embodiment is an embodiment of a wall in which the deformed horizontal bars 8 and 9 closer to the inner surfaces of the opposite molds 12 and 13 and the far deformed vertical bars 10 and 11 intersect and are arranged. The connecting portions 6 and 7 provided at a slight inclination from the right angle with respect to the horizontal bars 8 and 9 are fitted, and a cover thickness holding member between the formwork and the reinforcing bar is attached (FIGS. 6 and 7). ). The intersections of the deformed transverse muscles 8 and 9 and the longitudinal muscles 10 and 11 are bound by a binding muscle (not shown).
As for the attachment method, while expanding the entrance portions of the joint portions 6 and 7 of the cover thickness holding member between the formwork and the reinforcing bar to the left and right horizontal bars 8 and 9 by using the elasticity made of synthetic resin, It is inserted. As for the fitting procedure, either one of the left and right inlet portions may be first and the rest may be left, but if the angle between the coupling portion and the horizontal stripe is close to 90 degrees, the fitting can be performed simultaneously.

The second embodiment is an example of a column in which hoop muscles 16 and 17 made of deformed horizontal bars in the direction closer to the inner surfaces of the molds 14 and 15 and a main bar made of far-shaped deformed vertical bars intersect each other. The cover thickness holding member between the formwork and the reinforcing bar is attached to the hoop bar (FIGS. 8 and 9). In addition, the crossing part of the hoop muscles 16 and 17 and the main muscles 18 and 19 is bound with a binding muscle (not shown).
As in the first embodiment, the attachment method is such that the joint portions 6 and 7 of the cover thickness holding member between the formwork and the reinforcing bar are separately fitted into the left and right hoop bars 16 and 17 or are simultaneously fitted.

The third embodiment is an embodiment of a beam in which stirrup muscles 22 and 23 made of deformed transverse muscles closer to the inner surfaces of the molds 20 and 21 and the abdominal muscles of deformed longitudinal muscles far from each other intersect and are arranged. The cover thickness holding part between the formwork and the reinforcing bar is attached to the stirrup bar (FIGS. 10 and 11). Apart from this, it can also be used as a cover thickness holding member between the formwork and the reinforcing bar of the present invention on the main bars 26, 27 at the corners of the stirrup bars 22, 23. The stirrup muscles 22, 23 and the abdominal muscles 24, 25 are bound by a binding muscle (not shown).
The attachment method is the same as in the case of the wall or column, and the connecting portion of the cover thickness holding member between the formwork and the reinforcing bar is fitted to the left and right stirrup bars 22 and 23 separately or simultaneously.

  INDUSTRIAL APPLICABILITY The present invention can be used for a cover thickness holding member between a formwork and a reinforcing bar and a concrete structure using the same.

DESCRIPTION OF SYMBOLS 1 Connection steel bar 2,3 Spacer 4,5 Reinforcement rib 6,7 Joint part 8,9 Longitudinal muscle 10,11 Horizontal muscle 16,17 Hoop muscle 18,19,26 Main muscle 22,23 Stirrup muscle 24,25 Abdominal muscle 12, 13, 14, 15, 20, 21 Formwork

Claims (6)

  A pair of left and right spacers having a substantially pointed portion that abuts against the inner surface of each of the opposing molds, and a pair of left and right spacers that have joints that fit the reinforcing bars closer to the mold out of the reinforcing bars that intersect vertically and horizontally in the mold. A cover thickness holding member between a formwork and a reinforcing bar, comprising a connecting steel rod connected between the spacers.   The cover thickness holding member between the formwork and the reinforcing bar according to claim 1, wherein the spacer in claim 1 is made of a synthetic resin having elasticity, and the connecting steel bar is a round bar steel.   In the formwork, the spacers on both sides of the connecting steel bar are in contact with the inner surface of the opposite formwork in a pointed state, and the coupling part is fitted to the rebar closer to the formwork among the rebars that intersect vertically and horizontally. A concrete structure in which a cover thickness holding member between the formwork and the reinforcing bar is arranged and concrete is placed in the formwork.   4. The reinforcing bar which crosses the longitudinal and horizontal crosses is used as a horizontal reinforcing bar which is closer to the formwork, a long reinforcing bar which intersects the reinforcing bar is used as a vertical reinforcing bar, and the vertical reinforcing bar and the horizontal reinforcing bar which are used as a wall. Concrete structure described in 1.   The reinforcing bar that is closer to the formwork among the reinforcing bars that intersect in the vertical and horizontal directions is used as a hoop, the far reinforcing bar that intersects with the hoop is used as a main reinforcing bar, and the main bar and the hoop are used as a column that is bound by a binding bar. Item 4. The concrete structure according to Item 3.   Among the reinforcing bars that intersect vertically and horizontally, the reinforcing bar closer to the formwork is the stirrup muscle, the far reinforcing bar that intersects with this is the abdominal muscle or the main muscle, and the main muscle and the stirrup muscle are bound as the binding wire The concrete structure according to claim 3 to be used.

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