JP4695427B2 - Concrete handrail wall structure - Google Patents

Description

  The present invention relates to a structure of a concrete handrail wall used for a building or the like, and more particularly to a structure for preventing dry shrinkage cracks generated on the surface of a concrete handrail wall constructed by spotting concrete.

A general crack prevention structure in a so-called cast-in-place concrete handrail wall is a straight notch groove which is said to be a crack prevention joint on the inner surface and the outer surface of a concrete handrail wall as described in Patent Document 1 as a conventional example. Is formed. In other words, by concentrating cracks due to drying shrinkage on joints, it is intended to prevent other concrete surfaces from cracking.

  However, crack joints are often unable to follow drying shrinkage unless the spacing between joints is narrowed, and vertical joints will appear at small intervals on the concrete handrail wall. Not suitable for.

  Therefore, instead of the crack prevention joint, a slit for completely dividing the concrete handrail wall may be provided as described in FIG. Patent Document 1 proposes forming a V-shaped or U-shaped slit.

  The crack prevention structure by these slits has better followability to drying shrinkage than the crack prevention joint, and it is possible to set a wide interval, but it not only causes a difference in preference but also is difficult to construct There's a problem. In other words, when building a concrete handrail wall by casting concrete on the spot, a formwork for forming the slit is required, but it is desirable that the slit width is narrow in order to prevent the object from falling from the slit. After the concrete is hardened, it is not easy to demold the slit mold buried in a small gap. It doesn't have to be forced to remove the mold and the concrete will not break.

  In recent years, tiles are often attached to the surface of concrete handrail walls. However, the crack prevention structure by slits, especially V-shaped and U-shaped slits, requires tiles in the slits. There is also a problem that excessive costs are required.

JP 2001-182174 A

  The present invention has been made in view of the above-mentioned problems, and its purpose is to prevent dry shrinkage cracks generated on the surface of a concrete handrail wall, and it is easy to construct and forms a wide flat plate surface. It is to provide a concrete handrail wall structure that is excellent in design.

  In order to achieve the above object, the technical measures taken by the present invention are as follows. That is, the structure of the concrete handrail wall according to the first aspect of the present invention is such that a plate-like elastic member, a waterproof sealing groove and an elastic member insertion groove are formed on the concrete handrail wall, and the upper edge of the elastic member is formed. And the joint caps fitted on both side edges are embedded in a state in which the concrete handrail wall is divided into a plurality of longitudinal directions, and waterproof sealing is applied to the waterproof sealing groove portion of the joint cap to prevent cracking joints. It is characterized by being formed.

  The structure of the concrete handrail wall according to the second aspect of the invention is characterized in that, in the first aspect of the invention, the width of the waterproof sealing groove is narrower than the width of the elastic member insertion groove.

The structure of the concrete handrail wall according to the third aspect of the present invention is the structure of the first or second aspect, wherein the concrete handrail wall is formed on the concrete handrail wall with a crack prevention joint embedded with an elastic member, and on the concrete handrail wall surface. It is characterized by the fact that it is provided with a crack-inducing joint consisting of straight cutout grooves .

  According to the configuration of the invention described in claim 1, since the plate-like elastic member is embedded in a state where the concrete handrail wall is divided, the same crack prevention effect as that of the slit formed in the state where the concrete handrail wall is divided. And a wide flat plate surface can be formed by setting a large interval between crack preventing joints by embedding the elastic member.

  Nevertheless, since the elastic member is embedded in the concrete handrail wall, the work can be simplified without the work of removing the slit form as in the case of forming the slit. Also, even when tiled on a concrete handrail wall, there is no need for tiles as in the case of slits, and a waterproof sealing groove is formed on the joint cap, so a backup material for waterproof sealing is also required And not.

  According to the configuration of the invention described in claim 2, the apparent joint width appearing on the surface of the concrete handrail wall can be made small for the thickness of the elastic member, and the invention described in claim 3 can be used. As shown in the figure, when joints with crack prevention joints and crack-induced joints are embedded, it is possible to make the appearance the same, and even when tiled, the joint width can be narrowed corresponding to the tile joints. .

  According to the configuration of the invention described in claim 3, since the interval between crack prevention joints due to the embedding of the elastic member can be increased and the number of installed elastic members can be reduced, the increase in cost due to the use of the elastic member is suppressed as much as possible. Can do.

  Hereinafter, an embodiment of the present invention will be described by taking a concrete handrail wall provided on a balcony of an apartment house as an example. In FIG. 1 to FIG. 3, reference numeral 1 denotes a concrete handrail wall made of reinforced concrete built on the tip of a cantilever slab 2 constituting a balcony or the like, and the concrete handrail wall 1 has a crack prevention joint A. Is provided. Reference numeral 3 denotes an aluminum balustrade lattice connected to the concrete balustrade wall 1.

  As shown in FIGS. 2 to 5, the crack prevention joint A includes a plate-like elastic member 4 and joint caps 5 fitted to the upper edge and both side edges of the concrete handrail wall 1. The handrail wall 1 is embedded in a state of being divided into a plurality of parts in the longitudinal direction, and a waterproof sealing 6 is applied to a waterproof sealing groove portion a formed in the joint cap 5. In this example, a two-component polyurethane resin is used as the waterproof seal 6. Reference numeral b denotes an elastic member insertion groove formed in the joint cap 5.

  The finishing of the surface of the concrete handrail wall 1 is performed, for example, by spraying acrylic resin, attaching a tile, etc. In this example, the inner surface (building side) is sprayed with acrylic resin, and the outer surface is pasted with a tile 7. Finished. Reference numeral 8 denotes a base mortar for the tile 7. The joints of the tiles 7 are made to coincide with the waterproof sealing grooves a of the joint cap 5, and a waterproof seal 9 made of the same two-component polyurethane resin as the waterproof seal 6 is applied.

  The elastic member 4 is desirably a fire-resistant and stretchable material. In this example, a high-density foam such as polyethylene is used. The plate thickness of the elastic member 4 can be arbitrarily set, but in this example, the thickness is 20 mm. As the material for the joint cap 5, hard vinyl chloride is used in this example, but fireproof plastic can also be used as the material.

As shown in FIG. 6, the joint cap 5 is an extrusion-molded product in which a waterproof sealing groove 5a and an elastic member fitting groove 5b are formed back-to-back on both surfaces of a belt-like substrate portion. The width Ha of the waterproof sealing groove 5a is set to 15 mm at the opening, 10 mm at the groove bottom, and the depth (depth) L is set to 10 mm. The width Hb of the elastic member fitting groove 5b is the elastic member 4
The thickness of the elastic member 4 may be set slightly smaller than the plate thickness of the elastic member 4 so as to be fitted against the elastic restoring force of the elastic member 4.

  The concrete handrail wall 1 is constructed as follows, for example. First, as shown in FIG. 4 and FIG. 5 (A), a bar-shaped member 11 having a trapezoidal cross section corresponding to the waterproof sealing groove a is formed at predetermined positions on the inner surfaces of the handrail inner mold 10a and the outer mold 10b. While fixed to be opposed to each other, with the joint caps 5 fitted to the upper edge and both side edges of the elastic member 4, respectively, the both 4, 5 are placed between the inner mold frame 10a and the outer mold frame 10b. The rod-shaped member 11 is inserted as a guide rail of the waterproof sealing groove a, and the elastic member 4 and the joint cap 5 are supported in a vertical posture by the rod-shaped member 11.

  In this state, as shown in FIG. 5 (B), concrete 12 is placed in the mold, and after the concrete 12 is cured, it is removed from the mold 12 and finished with the tile 7 or the like. Reference numeral 13 denotes a reinforcing bar that is arranged in the mold at an appropriate time, and is arranged in a state of being separated from each other on both sides of the elastic member 4.

  According to said structure, since the plate-shaped elastic member 4 is embed | buried in the state which divides the concrete handrail wall 1, it has the same crack prevention effect as the slit formed in the state which divides | segments a concrete handrail wall, A wide flat plate surface can be formed by setting a large interval between the crack prevention joints A by embedding the elastic member 4.

  Nevertheless, since the elastic member 4 is embedded in the concrete handrail wall 1, there is no demolding work for the slit mold as in the case of forming the slit, and the construction can be simplified as compared with the structure for preventing cracks by the slit. Further, when attaching the tile 7 to the concrete balustrade wall 1, the tile cap 5 is formed in the joint cap 5 without the need for tiles as in the case of using a slit. No backup material is required.

  In addition, according to the above configuration, the width Ha of the waterproof sealing groove 5a is narrower than the width Hb of the elastic member insertion groove 5b. Therefore, even if a thick plate is used as the elastic member 4. The apparent joint width that appears on the surface of the concrete handrail wall 1 can be made smaller, and the joint width can be reduced corresponding to the tile joint.

  Moreover, since the crack prevention joint A by embedding the elastic member 4 is provided, the weight of the concrete handrail wall 1 and the building weight can be reduced as compared with the case where the crack induction joint is provided. That is, as shown in FIG. 11, when the crack induction joint B is provided on the concrete handrail wall 1, the concrete is thickened (fractured) in order to prevent the covering of the reinforcing bars 13 from being insufficient due to the loss of concrete. Since the joint missing portion 14 is formed above, the concrete handrail wall 1 not only becomes thicker than the thickness T of the handrail wall required for the proof stress calculation, but also extra concrete is used accordingly. Becomes heavier. As a result, a load is applied to the cantilevered slab, so it is necessary to increase the thickness of the cantilevered slab, and further, the weight of the entire building becomes heavy, and in some cases, the diameter of the pile has to be increased. However, the crack prevention joint A by embedding the elastic member 4 solves such a problem.

7 and 8 show another embodiment, which is characterized in that a crack-inducing joint B located on the extension line of the crack prevention joint A is formed on the front end surface, the lower surface and the upper surface of the cantilever slab 2. According to this configuration, as described above, the joint cap 5 has a cross-sectional shape in which the width Ha of the waterproof sealing groove 5a is narrower than the width Hb of the elastic member insertion groove 5b. Therefore, the thickness of the elastic member 4 is waterproof. Despite being larger than the width of the sealing bullet, the apparent joint widths of the crack preventing joint A and the crack-inducing joint B by embedding the elastic member 4 can be made the same. Other configurations and operations are the same as those in the embodiment of FIGS.

  FIG. 9 shows another embodiment, which is characterized in that the concrete handrail wall 1 is provided with a crack preventing joint A and a crack inducing joint B by embedding the elastic member 4. As a mode in which the crack prevention joint A and the crack induction joint B are provided side by side, the case where the crack induction joint B is arranged between the two crack prevention joints A, and the crack prevention joint A is arranged between the two crack induction joints B And a case where crack prevention joint A and crack induction joint B are alternately arranged. In any case, the apparent joint widths of the crack prevention joint A and the crack induction joint B by embedding the elastic member 4 can be made the same, and the arrangement interval of the elastic members 4 for dividing the concrete handrail wall 1 can be set. By increasing the number, the number of installed elastic members 4 can be reduced, and an increase in cost due to the use of the elastic members 4 can be suppressed as much as possible. Other configurations and operations are the same as those in the embodiment of FIGS.

  FIG. 10 shows another embodiment. In this embodiment, as in the case of FIG. 9, in addition to providing the concrete handrail wall 1 with the crack prevention joint A and the crack induction joint B by embedding the elastic member 4, the crack induction joint of the concrete handrail wall 1 is provided. B is formed so as to be continuous with the front end surface, the lower surface and the upper surface of the cantilevered slab 2, and the crack-inducing joint B is formed on the front end surface, the lower surface and the upper surface of the cantilevered slab 2 which is located on the extension line of the crack preventing joint A. It is characterized in that Other configurations and operations are the same as those of the embodiment of FIG.

It is a front view of the concrete handrail wall which shows embodiment of this invention. It is a schematic longitudinal side view of the concrete handrail wall shown in FIG. It is a cross-sectional top view of the principal part of a concrete handrail wall. It is a perspective view explaining the construction method of the crack prevention joint in a concrete handrail wall. It is a cross-sectional top view explaining the construction method of the crack prevention joint in a concrete handrail wall. It is sectional drawing of a joint cap. It is a front view of the concrete handrail wall which shows other embodiment. It is a schematic longitudinal side view of the concrete handrail wall shown in FIG. It is a front view of the concrete handrail wall which shows other embodiment. It is a front view of the concrete handrail wall which shows other embodiment. It is a cross-sectional top view of the concrete handrail wall explaining a crack induction joint.

A Crack prevention joint B Crack induction joint 1 Concrete handrail wall 4 Elastic member 5 Joint cap 5a Waterproof sealing groove 5b Elastic member fitting groove 6 Waterproof sealing

Claims (3)

A concrete handrail wall is formed with a plate-like elastic member, a waterproof sealing groove portion and an elastic member insertion groove portion, and a joint cap fitted to the upper edge and both side edges of the elastic member. structure There is embedded in a state of being divided longitudinally plurality, with waterproof sealing the groove waterproof sealing of the joint cap, concrete handrail wall, characterized in that is formed with cracking joints.   2. The concrete handrail wall structure according to claim 1, wherein the width of the waterproof sealing groove is narrower than the width of the elastic member insertion groove. The concrete handrail wall is provided with a crack preventing joint in which an elastic member is embedded and a crack inducing joint formed by a linear notch groove formed on the surface of the concrete handrail wall. The structure of the concrete handrail wall as described in 2.

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