JP2004211534A - Hoop reinforcement with spacer and slope protection frame work execution method using this hoop reinforcement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hoop reinforcement with a spacer for forming a highly reliable reinforced concrete skeleton more than a conventional skeleton and arranging the spacer of a simple structure integrally with the hoop reinforcement, and a slope protection frame work execution method for the reinforced concrete skeleton formed by using this hoop reinforcement with the spacer on a face of slope. <P>SOLUTION: Three or more of hoop wire rods 26 form a bending part 26a by bending both end parts, and have the hoop reinforcement 22 formed in a frame shape by oppositely arranging the mutual bending parts 26a of the adjacent hoop wire rods 26 and orthogonally fixed to a main reinforcement 20 and the spacer 24 installed in a projecting part 28 composed of the bending part 26a projecting outward from a corner part of the hoop reinforcement 22 and projecting outward while covering an outside end part of a projecting part 28. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention provides a hoop with a spacer in which a spacer for maintaining a predetermined cover thickness is provided integrally with a hoop, and a method for constructing a reinforced concrete frame formed using the hoop with the spacer on a slope. Concerning the construction method.

  As a method for protecting a slope, a method of constructing a reinforced concrete frame or the like in a grid on the slope to prevent landslides has been conventionally known. As an example of the method of forming a frame, there is a method of laying a mold in which a net body is wound around an outer peripheral portion of a reinforcing member on a slope, and hitting concrete into the laid mold to form a method frame. FIG. 7 shows an example of a bar arrangement structure of a mold used in this method frame construction method (for example, see Patent Document 1).

  FIG. 7 is a cross-sectional view showing the internal structure of the mold formed in a cylindrical shape. The mold 100 shown in FIG. 7 is formed in a frame shape in a transverse cross-section, and is provided with reinforcing bars 102 arranged at predetermined intervals in the longitudinal direction, and extending in the longitudinal direction and having predetermined intervals at the outer peripheral edge of the reinforcing frames 102. And a net 108 wound around an outer peripheral portion of a reinforcing bar body 106 formed in a tubular shape by the reinforcing bar frame 102 and the main bar 104.

  The reinforcing bar frame 102 is formed by connecting four reinforcing bar frame members 110 formed in a belt shape in a grid pattern. Cutouts 111 are provided at predetermined intervals on the outer peripheral edge of the reinforcement arrangement frame 102, and main reinforcements 104 extending in the longitudinal direction are positioned and arranged by the cutouts 111. Further, spacers 112 are attached to the corners of the reinforcing bar 102 so as to be in contact with the mesh 108 wound around the outer peripheral portion of the reinforcing bar 102 and to keep the cover thickness of the concrete constant.

The spacer 112 is provided at a fitting portion 116 that covers the corner projecting portion 114 of the reinforcing bar 102, a plate body 118 that protrudes outward from the fitting portion 116, and an outer edge of the plate body 118. The contact portion 120 with which the corner portion 108 contacts is integrally formed of a synthetic resin. A slit 122 is formed in the fitting portion 116 so that the protruding portion 114 fits therein, and an insertion hole 124 is formed so that the main bar 104 is arranged at an outer peripheral corner of the reinforcing bar frame 102. .
JP-A-5-209412 (FIG. 2)

  When concrete is poured into the mold 100 shown in FIG. 7, a hose for injecting concrete is provided at the top of the cylindrical mold 100 or in the middle of the mold 100 from which a part of the net 108 is removed. Then, the concrete is poured by pushing the inside through the inner space of the reinforcing bar 102. However, since the reinforcing bar frame 102 is band-shaped, there is a problem that the inner space of the reinforcing bar frame 102 is narrowed, so that the hose cannot be suitably taken in and out.

In addition, the concrete to be cast into the mold 100 may not be filled with the concrete on the back surface side of the reinforcing bar 102 by the reinforcing bar 102 which is disposed in a direction perpendicular to the main bar 20. And, as the width of the reinforcing bar 102 increases, the degree of filling of the concrete decreases, an irregular cross section is formed, and stress concentration corresponding to the external force is likely to occur, which may affect the strength of the reinforced concrete.
In addition, the structure of the spacer 112 attached to keep the cover thickness constant is complicated, so that there is a problem that it is difficult to manufacture a mold.

  In view of the above, the present invention has been made to solve these problems, and an object of the present invention is to provide a reinforced concrete frame having higher reliability than before, and to use a hoop with a spacer having a simple structure. An object of the present invention is to provide a hoop with a spacer provided integrally with a bar, and a method of constructing a reinforced concrete frame formed using the hoop with a spacer on a slope.

The present invention has the following configuration to achieve the above object.
That is, three or more hoop wires having bent portions formed by bending both end portions are formed in a frame shape by holding the bent portions of the adjacent hoop wires facing each other and formed in a frame shape, and are orthogonal to the main muscle. A hoop stud to be attached, and a spacer attached to a protrusion formed by the bent portion projecting outward from a corner of the hoop streak, and projecting outward while covering an outer end of the protrusion. It is characterized by the following.

Further, the spacer is attached to the hoop streak by fitting a fitting hole provided in the spacer with the protrusion. Thus, the heavy spacer can be attached after the hoop is installed, so that the hoop with the spacer can be easily attached.
Further, the bent portions of the adjacent hoop wires are fixed by a fixing member. Accordingly, there is no need to attach the hoop muscle through the distal end side of the main muscle extending in the longitudinal direction, and the hoop muscle can be assembled and attached at the installation position of the hoop muscle.

In addition, a plurality of main reinforcements extending in the longitudinal direction, and a reinforcing member composed of the hoop with a spacer arranged at a predetermined interval in the longitudinal direction, a net body and a holding bar are wound around a reinforcing member to form a mold, The mold is connected to the slope and installed, and concrete is poured into the mold.
Further, the distance between the adjacent main bars is maintained at a predetermined value by bridging a scoring bar formed in a flat U-shape.

According to the method frame of the present invention, as described above, since the hoop streak is formed of the hoop wire, the hose can be suitably taken in and out when the concrete is hit. In addition, this makes it possible to form a reinforced concrete skeleton with a high degree of concrete filling, thereby improving the reliability of the strength of the reinforced concrete frame as a whole. In addition, since a projection is provided on the hoop, and a spacer having a simple structure is attached to the projection, the hoop with a spacer can be easily manufactured.
And by using the hoop with a spacer which has the above-mentioned effect, a concrete frame of a reinforced concrete frame having a reliable strength can be constructed.

Hereinafter, preferred embodiments of the legal framework according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a front view showing the structure of a mold (a) used for construction of a method frame of the present embodiment and a reinforcing bar (b) provided inside the mold.
The legal frame of the present embodiment is formed in a lattice shape by laying a substantially T-shaped mold body 10 on the slope and casting concrete on the mold body 10. The mold body 10 has a reinforcing bar 16 disposed inside, a net 18 wound around the outer periphery of the reinforcing bar 16, and a holding bar 19 wound spirally from above the net 18.

As shown in FIG. 1A, the mold body 10 is substantially T-shaped by a pillar portion 12 extending in the height direction of the slope, and a beam portion 14 provided horizontally at a substantially upper end edge of the pillar portion 12. It is formed in a shape. As shown in FIG. 1B, a reinforcing bar 16 in which a column reinforcing bar 16a and a beam reinforcing bar 16b are combined is provided inside the mold body 10.
The column arrangement 16a and the beam arrangement 16b are provided with a plurality of main reinforcements 20, 20,... Extending in the longitudinal direction, and with hoop reinforcements 22, formed in a frame shape in the transverse section and arranged at predetermined intervals in the longitudinal direction. 22... In this case, a substantially square hoop reinforcement 22a is used for the column reinforcement 16a, and a substantially rectangular hoop reinforcement 22b is used for the beam reinforcement 16b.

Here, in the present invention, the hoop streaks 22 are formed of a wire-shaped hoop wire instead of the conventional reinforcing bar frame material 110 (see FIG. 7). A spacer having a simple structure is provided integrally with a hoop streak.
FIG. 2 (a) is a cross-sectional view of the pillar arrangement 16a shown in FIG. 1 (b), and shows one embodiment of a hoop with a spacer according to the present invention. From this figure, the reinforcing arrangement of the present embodiment will be described in detail below.

The hoop streaks 22a of the present embodiment are composed of four hoop wires 26 whose both ends are bent. The bent portions 26a of the adjacent hoop wires 26 are adjacent to each other on the same plane, and the bent portions 26a are joined by welding. And provided in a rectangular frame shape.
The bent portion 26a of the hoop wire 26 is provided so that the angle formed between the bent portion 26a and the straight portion 26b is bent outward on a diagonal line passing through the center of the cross section, and two adjacent hoop wires 26 are provided. , 26 are formed such that the angle formed by the straight portions 26b, 26b when they are joined is substantially a right angle in this case.

  The hoop streaks 22a formed by joining the four hoop wires 26 to form a frame are provided with projections 28 projecting outward from the corners of the frame by joining the bent portions 26a. A spacer 24 is provided on the protrusion 28. The spacer 24 is provided with a mesh 18 wound around the outer periphery of the reinforcing member 16 in contact with the outer end of the spacer 24. The spacer 24 has a predetermined covering thickness of the concrete and a predetermined crossing of the mold in combination with the presser bar 19. It is provided to form a surface. In the present invention, the spacer 24 is provided so as to cover at least the outer end of the protruding portion 28 and protrude outward from the outer end of the protruding portion 28.

The spacer 24 of this embodiment is made of concrete, protrudes outward from the middle of the protruding portion 28, and has a corner portion 24a formed so that the outer end thereof is substantially perpendicular to the same plane.
The spacer 24 has four spacer molds formed by separate molds conforming to the planar shape of the spacers 24, and the protrusions 28 are formed on the spacer molds provided at the four corners. After placing the hoop streak so as to be located at the center, the hoop streak is formed integrally by hitting and curing concrete on the spacer formwork. Then, as shown in FIG. 2 (b), the mesh body 18 is wound in accordance with the corners 24a of the spacer 24, and the spiral presser bars 19 are arranged while stretching the coil-shaped bars. 10 are formed.
By forming the spacers 24 as described above, the spacers 24 can be easily provided on the hoop streaks 22a, and the mold 10 can be easily manufactured.
Although the size of the spacer 24 is appropriately set, it is preferable that the spacer 24 be provided in such a size that it does not penetrate through the mesh of the net body 18 and be lightweight.

  In the present invention, the spacer 24 is not limited to being formed of concrete, but may be formed of mortar. Also, in the above description, only the hoop reinforcement 22a of the column reinforcement formed in a substantially square shape has been described, but the hoop reinforcement 22b of the beam reinforcement 22b formed in a substantially rectangular shape has the same configuration, and the same effect is obtained. To play.

  In the present invention, the spacer 24 is formed of concrete or mortar which can be regarded as having the same properties as reinforced concrete, thereby preventing corrosion of the reinforced concrete body 16 after the concrete has been cast. That is, the reinforcing bar 16 disposed in the concrete is provided so as not to corrode because the outer end-side protruding portion 28 that may come into contact with outside air or water is covered by the spacer 24.

  As shown in FIG. 2A, the main reinforcement 20 is arranged in a direction orthogonal to the hoop wire 26. The main bars 20 are provided at predetermined intervals on the inner peripheral edge of the hoop bar 22 formed in a frame shape. The main bars 20 are arranged while being held at predetermined intervals by the scribing bars 30.

FIG. 3 is a partial perspective view of the pillar arrangement 16a shown in FIG. As shown in the figure, the scissor streak 30 is formed in a U-shape in a plane, and is installed on the adjacent main streaks 20, 20 such that the tips of the claws 30a, 30a of the scissor streak 30 face outward. Installed.
The girder 30 is firstly bridged from the square 20a of the main muscle 20 located at the corner of the hoop 22a to the adjacent main muscle 20b and fixed by the binding wire 32. Next, it is erected between the main bar 20b and the adjacent main bar 20c, and is installed between the main bars 20 in order. By connecting the adjacent main muscles 20 in this order from the corner muscles 20a in this manner, a predetermined interval between the main muscles 20 is maintained.

Next, a method of constructing a legal frame on a slope using the mold 10 will be described with reference to FIG. The construction of the legal framework according to the present embodiment is performed by a method in which a substantially T-shaped mold 10 is formed in a factory or the like and brought to a site where the mold is constructed.
First, at the base of the slope 34, a reinforced concrete foundation 38 from which connecting bar groups 36 project at predetermined intervals is constructed. Thereafter, the protruding connecting streaks 36 and the main streaks 20 of the column portion 12 are connected by a tying bar (not shown), and the connecting streaks 39 of the adjacent beam portions 14 are connected by a tying bar to be connected in the horizontal direction. A first-stage mold body group is constructed. Then, after a presser bar 19 (see FIG. 1A) is spirally wound from above the mesh body 18, concrete is hit into the mold body 10.

Concrete is struck by inserting a hose from the top of the column portion 12 or a part of the net 18 partially cut open. At this time, there has been a case where the hose is difficult to enter because the reinforcing bar frame 102 is provided in a belt shape as shown in FIG. 7 in the related art. However, in the present invention, the hoop bar 22 is formed of a wire. Thus, it becomes possible to insert a hose more suitably than before.
In addition, when the band-shaped reinforcing bar frame 102 is provided, when the concrete is struck, there is a possibility that the back surface of the reinforcing bar frame member 110 is not reliably filled with concrete and a gap is generated. However, in the present invention, there is no such a problem, and the mold body 10 is reliably filled.

  Further, by forming the hoop bar 22 from a wire as in the present invention, it is possible to form a strong reinforced concrete. That is, by minimizing the width of the hoop bar to a minimum, the degree of filling of the concrete is increased, so that the strength of the reinforced concrete can be ensured.

  Then, the poured concrete partially swells from the mesh of the net body 18 and solidifies into an uneven state, thereby forming the first-stage legal frame 40. Since the surface of the lawn frame is formed into a natural stone-like shape by providing the surface of the lawn frame in an uneven shape, a law frame in harmony with nature can be constructed. In addition, the net body 18 and the holding bar 19 are left in a state where the concrete is cast.

  Next, a connecting streak group 36 protruding from the top of the first column 12 and a lower end of the main streak 20 of the mold 10 arranged in the second stage are connected by a tying bar, and the adjacent beam portion 14 is connected. Are connected to form a second-stage body group. Thereafter, concrete is cast in the same manner as described above to form the second-step legal frame 42. Then, by constructing a substantially T-shaped reinforced concrete frame in order from the lower end of the slope 34 toward the upper side, the slope 43 is completed.

  In addition, as shown in FIG. 5, when there is a concave portion 44 on the slope 34 on which the normal frame 43 is provided, the position of the mold provided in the concave portion 44 is measured in advance, and a net of a part of the mold is removed. The mesh is changed to a coarse mesh 18a. In this way, the concrete hit on the mold leaks out of the coarse net 18a and fills the concave portion 44. Further, since the concrete hit in the concave portion 44 adheres to the legal frame 43, the legal frame 43 can be fixed to the slope 34.

Note that the slope protection structure according to the present invention is not limited to the present embodiment.
For example, the spacer 24 provided on the projecting portion of the hoop streak 22 may be integrally provided so as to cover the entire projecting portion. Further, the formation of the spacer 24 is not limited to the above method. Further, in the present embodiment, the bent portions of the hoop wires are joined side by side, but may be joined by overlapping.

Although the hoop streaks 22 are formed using four hoop wires 26 in the present embodiment, the present invention is not limited to this, and a polygonal hoop is formed using three or more hoop wires. A streak may be formed and provided on a reinforcing steel body having a polygonal section.
Further, the formwork to be attached to the reinforcing bar is not limited to the net 18, but may be an ordinary formwork. However, a mesh body that is easily deformed unlike a normal formwork can be formed into a set cross-sectional shape by bending, bending and winding the holding bar 19 at the outer end of the spacer. Since the surface shape can be maintained, the hoop with a spacer can be effectively used.

  Next, a second embodiment of the hoop with a spacer according to the present invention will be described. Similarly to the first embodiment, the hoop with a spacer of the second embodiment is formed in a frame shape and arranged perpendicular to the main bar 62 extending in the longitudinal direction.

  FIG. 6 is a transverse sectional view and a partial perspective view showing the configuration of a second embodiment of the hoop with a spacer according to the present invention. As shown in the drawing, the hoop 50 with spacer of the present embodiment is configured such that a hoop wire 56 provided with a bent portion 56b in which both ends of a straight portion 56a are bent by a predetermined angle and a bent portion 56b of an adjacent hoop wire 56 are overlapped. And a spacer 54 detachably attached to a protrusion 60 formed by fixing the bent portion 56b with the fixing member 58.

As shown in FIG. 6A, the hoop streaks 51 of the second embodiment have the bent portions 56 b of the four hoop wires 56 directed outward and overlap the bent portions 56 b in the longitudinal direction in which the main bars 62 extend. , And fixed to the fixing member 58 to form a rectangular frame.
The fixing member 58 for fixing the bent portion 56b is formed in a ring shape from iron, and as shown in FIG. 6B, with the bent portion 56b overlapped, is fitted from the distal end side of the bent portion 56b to be bent. It is attached to the root position of the portion 56b.

  A spacer 54 that holds the cover thickness of the concrete is attached to the protrusion 60 provided with the bent portion 56b fixed. As shown in FIG. 6 (c), the spacer 54 of the present embodiment is formed of concrete into a block shape in which an outer edge 54a is formed at a substantially right angle in a planar shape, and a protrusion 60 is fitted on the inner side surface 54b. A fitting hole 54c is provided. The fitting hole 54c is opened to a size in which the overlapped bent portion 56b fits, and is formed to extend in a direction orthogonal to a plane formed by the hoop wire 56.

  As described above, in this embodiment, since the hoop wire 56 is formed in a frame shape with the bent portions 56b overlapped with each other, the area of the cross section of the spacer 54 covering the bent portion 56b is smaller than the spacer of the first embodiment. 24 can be made narrower. Thereby, when the concrete is struck, the concrete is easily filled up to the back side surface of the spacer 54.

The hoop 50 with spacer configured as described above can be easily assembled at a construction site. That is, in the hoop with the spacer of the first embodiment, the bent portion 26a of the hoop wire 26 is welded to fix the concrete spacer 24 to the protrusion 28, but the hoop with the spacer of the second embodiment is used. Reference numeral 50 indicates that the bent portion 56b is fixed by the fixing member 58, and the spacer 54 prepared in advance at a factory or the like is attached by fitting the fitting hole 54c of the spacer 54 and the projecting portion 60. It can be easily assembled on site.
Thereby, the hoop wire 56 is assembled at the mounting position from the outer peripheral side of the main bar 62 extending in the longitudinal direction, formed into a frame shape, fixed to the main bar 62 with a binding wire or the like, and a spacer is attached to the protrusion 60. Thus, the hoop 50 with spacer can be easily attached to the mold.

  In this embodiment, the spacer is made of concrete, but may be made of mortar, synthetic resin, or the like. In the present embodiment, the bent portions are overlapped and fixed by the fixing member. However, the bent portions may be fixed by the fixing member in a state where the bent portions are adjacent to each other on the same plane.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the structure used for the construction of the slop which is one Embodiment of the protection structure of the slope which concerns on this invention, and the structure of the rebar provided inside a mold. FIG. 2 is a cross-sectional view showing a reinforcing bar structure of the reinforcing bar and the mold shown in FIG. 1. FIG. 2 is a partial perspective view showing the reinforcing bar structure of FIG. 1. It is a front view showing the construction state of the legal frame of this embodiment. It is a side view showing the construction state of the legal frame of this embodiment. FIG. 7 is a cross-sectional view and a partial perspective view showing the configuration of a second embodiment of the hoop with a spacer according to the present invention. It is sectional drawing which shows the reinforcement arrangement of the type | mold used when constructing the conventional method frame.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 10 type | mold 12 pillar part 14 beam part 16 reinforcement body 18 mesh body 20 main bar 22 hoop bar 24 spacer 26 hoop wire 28 projecting part 30 girder 50 hoop bar with spacer 52 hoop bar 54 spacer 56 hoop wire 58 fixing member

Claims (5)

Three or more hoop wires having bent portions formed by bending both ends are formed in a frame shape while holding the bent portions of the adjacent hoop wires facing each other, and are attached orthogonally to the main bar. Hoop muscles,
A spacer attached to a projecting portion consisting of the bent portion projecting outward from a corner of the hoop muscle, and projecting outward while covering an outer end of the projecting portion. With hoop muscle. The hoop muscle with a spacer according to claim 1, wherein the spacer is attached to the hoop muscle by fitting a fitting hole provided in the spacer with the protrusion. 3. The hoop with a spacer according to claim 2, wherein the bent portions of the adjacent hoop wires are fixed by a fixing member. A reinforcer comprising a plurality of main reinforcements extending in the longitudinal direction and the hoop with a spacer according to any one of claims 1 to 3, which are disposed at a predetermined interval in the longitudinal direction, a mesh body and a presser reinforcement. To form a mold,
A method for constructing a method, wherein the mold is connected to a slope and installed, and concrete is poured into the mold. The method according to claim 4, wherein the interval between the adjacent main bars is maintained at a predetermined value by bridging a scoring bar formed in a U-shape in a plane.

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