JP4158048B2 - Rebar holding method during block manufacturing process - Google Patents

Description

The present invention relates to a reinforcing bar holding how in the block manufacturing process, particularly, the reinforcing bar holding how in the manufacturing process of the block strength stable structure in the production of such large for revetment block is obtained It is related.

  Conventionally, in a revetment block, a reinforcing bar having a predetermined shape is arranged on a rectangular plate-shaped block, and each fastening end portion protrudes from each corner side wall of the block so that blocks adjacent to each other at the time of laying are arranged. For such a block, in the manufacturing process, the fastening rebars are arranged almost horizontally in the upper-opening mold, and each fastening end is particularly held. It simply protruded out of the formwork.

  However, large revetment blocks that are larger than normal revetment blocks with vertical and horizontal lengths of about 50 cm or less, for example, with a vertical or horizontal length of about 1 m or more, and are designed to save labor. During the manufacturing process, the fastening end portions of the fastening bars arranged almost horizontally in the mold are protruded out of the mold, and the fastening ends are merely supported without being fixed. Therefore, the fastening bars in the formwork are affected by the weight of the concrete and the concrete filled in the formwork, curving downward and projecting downward, and the concrete is cured and commercialized as it is. As a result, it is not possible to play the role of a reinforcing bar that ensures an appropriate effective height and cover size by acting almost horizontally and resists the bending load during use effectively. Cracks occur Etc., there is a problem that does not maintain a predetermined block strength.

The present invention provides such was made in view of the conventional problems, to provide a reinforcing bar holding how the block during the manufacturing process the strength stable structure in the production of large blocks such as a revetment is obtained Let it be an issue.

In order to solve the above problems, the reinforcing bar holding method in the block manufacturing process of the present invention arranges fastening reinforcing bars 7 having a predetermined shape in the block main body 2, and each fastening end portion 7 a is connected to each corner of the block main body 2. Reinforcing bar holding method during the manufacturing process of a block protruding from the side wall 2c , two sets of reinforcing bars formed by bending the reinforcing bar 7 into a rhombus shape so that the outer shape of the reinforcing bar 7 is substantially a cross-shaped shuriken shape. A planar shape in which the four ends in the crossing direction forming the cross shape are formed into a hanging fastening end portion 7a and joined and integrated at each connecting point 7b forming the crossing portion. structure and without, is projected to the fastening end 7a of the fastening reinforcing bars 7 arranged substantially horizontally in the mold 8 of top opening into the mold 8 outside each of the rod-shaped hanging outside the mold 8 coercive order to protrude obliquely downward the fastening end 7a from the mold 8 is pressed downward It allows characterized by imparting a tension to the entire fastening reinforcing bars 7 in the mold frame 8.

The reinforcing bar holding method during the block manufacturing process according to the present invention is such that each suspension end of the reinforcing bar is formed outside the mold by forming a planar structure disposed in a substantially horizontal manner within the upper opening type mold. In order to apply tension to the entire fastening rebar in the mold , by pressing downward outside the mold and holding it to project diagonally downward from the mold, during the block manufacturing process, The fastening rebar does not hang downwards due to its own weight or the effect of the concrete filled in the formwork, and it remains in an almost horizontal or upward convex shape with an appropriate effective height and cover size after filling the concrete. Can be placed in tension. Therefore, the tensile force previously applied to the fastening reinforcing bars is transmitted as a compressive force to the block body after the concrete has hardened, causing internal stress to be latent in the block body, and the latent stress causes bending resistance of the block body during loading. Therefore, it is possible to contribute to the production of a block having a stable structure without causing cracks.

Further, in order to form the fastening reinforcing bars with substantially cross dart like the contour, the two pairs of reinforcing bars formed by bending a substantially rhombic shape superimposed on the cross-shaped, each end 4 points in the transverse direction and forming a cross-shaped together form a fastening end of the hanging rod-shaped, in order to have a planar structure integrally connected and joined at each connection point forming the intersection, an external force to the fastening end of the rod-shaped suspended as described above When the entire reinforcing bar is tensioned by acting, the tensile force that acts outward in the cross direction forming the cross shape, that is, toward the diagonal part of the block main body to be molded , is described above at each connection point of the fastening reinforcing bar. that exerting evenly respectively as tensile force to the respective side wall direction of the block body, the effective tension is obtained, which contributes to the production of the block strength of stable structure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a large block for revetment, 1 is a large block, and a fastening bar 7 having a predetermined shape as shown in FIG. Each fastening end 7a having a substantially V-shaped hanging shape of the fastening rebar 7 protrudes outward from each corner-shaped corner side wall 2c of the block body 2, and each fastening end 7a is a large block. It becomes a connection part of the block main bodies 2 adjacent to each other when laying one.
In addition, the surface of the block body 2 is provided with a concave portion 3 with the surface portion 2b remaining in a frame shape between the edge portion 2a, and a straight rib 4 that divides the concave portion 3 into right and left is relatively As shown in FIG. 1B, the upper, lower, left and right side walls 2d of the block body 2 are located on both sides of each corner cut portion. A convex portion 2e is provided, and a concave groove 2f is provided between the convex portions 2e along the length direction of the side wall 2d.

In the reinforcing bar holding method during the block manufacturing process of the present invention, for example, the reinforcing bar 7 having a predetermined shape is arranged on the block body 2 having the large block 1 and other shapes and structures, and each fastening end portion 7a is blocked. It is a reinforcing bar holding method during the manufacturing process of the block which protrudes from each outer wall of the main body 2.
FIG. 2 shows the reinforcing bar 7 of the large block 1 in FIG. 1 and the like, and the two reinforcing bars 7 are bent in a substantially rhombus shape so that the outer shape of the reinforcing bar 7 is a cross-shaped shuriken shape. rebar are superimposed in a cross shape, no planar structure ing linked integrally joined at each connection point 7b constituting the intersection, Tsu杆the end 4 points for each cross direction and forming a cross-shaped The fastening end 7a has a shape.

And Thus, rebar holding method of the block during the manufacturing process of the present invention, during the assembly of the mold 8, as shown in FIG. 3, the mold frame 8 of the top opening of the fastening reinforcing bars 7 that constitute the planar structure Are arranged in a substantially horizontal shape, and the respective fastening end portions 7a in the form of hanging rods are projected out of the mold 8, and the fastening ends 7a are pressed downwardly outside the mold 8 so as to be obliquely downward from the horizontal shape. By holding it facing, tension is applied to the entire fastening rebar 7 in the mold 8.

Specifically, when the fastening rebar 7 is first arranged almost horizontally in the mold 8, as shown in FIG. 4 (d), the large-sized bar is formed in the diagonal direction at each corner of the mold 8. A fastening end portion 7a that is a hanging rod shape of the fastening reinforcing bar 7 is inserted into an external fitting shape into a rod body 8c that is provided upright apart from the lower corner side plate 8d that forms the corner side wall 2c of the block 1. The fastening end portion 7a is fitted into and supported by the upper edge groove portion 8d 'of the lower corner side plate 8d that is connected to the bottom mold 8a.
Next, as shown in FIGS. 4A to 4C, the corner side walls 2c of the large block 1 are located in the side molds 8b of the divided mold 8 at each corner of the mold 8. The side molds 8b can be divided so that the outer end of the fastening end 7a is pressed downward by the downward protruding piece-like pressing pieces 8f spaced apart from the outside of the upper corner plate 8e. Match the mold and fix. That is, by the pressing of the pressing piece 8f, the outer protruding end of the fastening end portion 7a has a downward slanting shape with the outer protruding root as a fulcrum, and the outer protruding root has the lower corner plate 8d and the upper corner plate 8e. In addition, each fastening end portion 7a that protrudes outside the mold 8 can be firmly held and fixed by the outer protruding end being engaged with the rod body 8c in an external fitting manner.

  Note that the pressing piece 8f has an open / close structure of the divided side mold 8b (the side mold 8b positioned in four directions is pivotally attached to the mold base 8g at the lower part thereof, and the upper, lower, The fastening end 7a has a hanging shape as shown in FIG. 4 (b) so that the lower edge slides on the fastening end 7a and presses it downward while sliding on the fastening end 7a. The lower edge of the pressing piece 8f is formed in a horizontal plane depending on the division and opening / closing structure of the side mold 8b, and presses the fastening end 7a vertically. Other shapes and structures may be used.

As is the case thereby imparting tension to the fastening reinforcing bars 7 which forms the planar structure in the mold frame 8 (hanging obliquely downward degree of the fastening end 7a of the rod-shaped large illustrated in FIG. 5 (b) The fastening rebar 7 is held in a state of being curved upward convexly).
Further, as shown in FIG. 5 (b), even when the block body 2 is formed by filling the formwork 8 with the ready-mixed concrete 27, the fastening rebar 7 forming the above planar structure has its own weight or ready-made concrete 27. The appropriate effective height and cover size are ensured without sagging downwardly projecting under the influence of the above, and the bar can be arranged in a substantially horizontal shape (or upwardly convex shape) while maintaining tension, and the product is fastened as described above. The tension of the reinforcing bars 7, that is, the internal stress, contracts within the block body 2 after the ready-mixed concrete 27 is hardened to give the block body 2 a compressive force, and even if a load is applied to the block body 2 during use, it will crack. Thus, a block having a stable structure can be obtained.

  In the reinforcing bar holding method, the fastening end 7a of the fastening reinforcing bar 7 is sandwiched and supported by the lower corner plate 8d and the upper corner plate 8e of the mold 8, and the upper corner plate 8e of the side mold 8b is supported. Although the outer end of the fastening end portion 7a is pressed downward by the pressing piece 8f provided to be separated from the outside, the reinforcing bar holding method of the present invention is not limited to this, and the outside of the mold 8 It is only necessary to apply a tension to the fastening rebar 7 in the mold 8 by pressing the fastening end portion 7a protruding to the diagonally downward from the horizontal shape, and the mold 8 is pressed with a structure different from the above. Appropriate means may be employed such as adding means or providing a pressing means such as a pressing jig or device separately from the mold 8.

Further, as shown in FIG. 2, the fastening rebar 7 has a substantially cross-shaped shuriken-shaped outer shape and is joined and integrated at each connection point 7b crossing the cross to form a planar structure. From the above , when the fastening reinforcing bar 7 is tensioned, as shown in FIG. 3, the respective crossing directions, that is, the respective tensile forces Pt acting on the diagonal portions of the mold 8 are applied to the connecting points 7b. Thus, an effective tension state is obtained by acting equally as the tensile resultant force R in the direction of the side mold 8b of the mold 8, and a suitable compressive force is obtained even in the block body 2 molded in this state. The resulting Ru.

Note that the block body 2 using the up Symbol fastening reinforcing bars 7, other shapes of the large block 1, like a table surface is formed in a flat or convex, concavo-convex, the shape, structure, etc. particularly restricted Not what you want.

  An example of a large block for revetment is shown, (A) is a front view, (B) is a plan view, (C) is a cross-sectional view along A-A in (B), and (D) is a cross-sectional view along B-B in (B). . The top view which shows the example of the reinforcing bar for fastening of the large block for revetment in FIG.   The top view which shows the state which fixed the reinforcing bar to the formwork in the reinforcing bar holding | maintenance method in the block manufacturing process of this invention.   (A) is an enlarged plan view showing the end side from the line NN in FIG. 3, (b) is a front view of (b), (c) is a cross-sectional view taken along QQ of (b), and (d) is Sectional drawing which shows before the reinforcing bar fixation in (c). FIG . 4A is a cross-sectional view taken along the line PP in FIG .

Explanation of symbols

1 Large Block 2 Block Body 2c Corner Side Wall 7 Fastening Rebar 7a Fastening End 7b Connection Point 8 Formwork 8f Pressing Piece

Claims (1)

Manufacture of a block in which a reinforcing bar (7) having a predetermined shape is arranged on the block main body (2), and each fastening end (7a) protrudes from each corner side wall (2c) of the block main body (2). Reinforcing bar holding method in the process, in order to make the outer shape of the fastening reinforcing bar (7) almost a cross shuriken shape, two sets of reinforcing bars bent in a roughly rhombus shape are overlapped in a cross shape, and the cross shape The four end portions in the crossing direction forming the hanging portions are the hanging-end-like fastening end portions (7a), and the planar structure is joined and integrated at each connecting point (7b) forming the crossing portion. is projected the fastening end of the top opening of the mold (8) the fastening reinforcing bars arranged substantially horizontally in (7) (7a) mold (8) to the outside, the mold (8) outside the holding be in order to protrude from the fastening end of the hanging rod-shaped mold to press the (7a) below (8) obliquely downward More, rebar holding method in the block manufacturing process, which comprises applying a tension to the fastening entire reinforcement (7) in the mold (8).

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