JP5618550B2 - Reinforcing bar placement in reinforced concrete forming - Google Patents

Description

  The present invention relates to a technique for arranging reinforcing bars in a mold for forming reinforced concrete.

  When forming reinforced concrete, in order to obtain a predetermined cover thickness, the reinforcing bars are arranged at predetermined positions in the mold.

1) Reinforcing bar arrangement technology using spacers Spacers are synthetic resin molded products, and there are trapezoidal ones on which reinforcing bars are placed and cap-shaped ones that cover the reinforcing bars. These spacers are arranged between the reinforcing bars in the mold and the inner surface of the mold, and are embedded in the concrete put into the mold. The end of the embedded spacer that is in contact with the inner surface of the mold is exposed on the molding surface of the reinforced concrete.

2) Reinforcing Bar Arrangement Technology Using Hanging Fittings Patent Document 1 discloses a hanging metal fitting that suspends beam reinforcing bars in a formwork from the upper end of the outer peripheral wall of the formwork at a construction site. This hanging metal fitting has a gate shape that fits the mounting member to the upper end of the outer peripheral wall of the formwork. The gate-shaped attachment member has a fastening bolt attached to the outer piece, and a support member protruding to the inner piece and fixed to the inner piece. The support member penetrates a long hole long in the protruding direction in the vertical direction, and a suspension bolt is passed through the long hole. The suspension bolt is fixed to the support member with a tightening nut, and a connecting piece is screwed to the lower end. The connecting piece is screwed with a hook bolt at the bottom. The hook bolt places the end of the beam reinforcement on the lower hook.

  For the formwork, concrete is thrown in with the internal beam rebar suspended from the hanging bracket. In the hanging bracket, hook bolts and connecting pieces are embedded in concrete. After curing the concrete in the formwork, leave the hook bolts in the concrete, and remove the connecting pieces and the upper suspension bolts. Cured concrete is filled with mortar in the holes where the inverted conical connecting pieces have been extracted. The connecting piece may be embedded and may be left in the concrete. This embedded connecting piece is screwed into a reinforcing bar for reinforcing the joint.

Japanese Utility Model Publication No. 58-64726

[Task]
1) Reinforcing bar placement technology using spacers The end of a synthetic resin spacer is exposed on the concrete molding surface of a reinforced concrete molded product. There is a possibility that the exposed end of the spacer and the concrete around it may be separated to form a gap. Around the exposed end of the spacer, it tends to be a starting point for cracks in the concrete.

  If there are irregularities or slopes on the inner bottom surface of the mold to form irregularities or slopes of landscape or decorative patterns on the surface of the reinforced concrete molded product, the distance between the inner bottom surface of the mold and the reinforcing bars in the mold Is not constant and varies depending on the position of the bottom surface in the mold. Spacers with different dimensions are required. Further, when the spacer arrangement position on the bottom surface in the mold is not a horizontal plane but an inclined surface, the trapezoidal spacer easily falls. It takes a lot of work to arrange the reinforcing bars.

2) Reinforcing bar placement technology using hanging brackets A hanging bracket consists of a gate-shaped mounting member, a tightening bolt, a support member with a long hole, a suspension bolt, a tightening nut, a connecting piece with a screw hole, and a hook bolt. Yes. The number of parts is large, and it takes a lot of work to produce.

  In addition, after curing the concrete in the formwork, it takes time to remove the connecting piece and to fill the hole in the removed trace. It takes a lot of work to arrange the reinforcing bars.

[Idea]
Reinforced concrete moldings include precast concrete panels and blocks. A large number of panels and blocks are arranged and connected to construct walls and passages. In such a reinforced concrete molded product, a reinforcing bar is embedded inside, and a connecting nut is embedded on the outer surface such as the back surface. The insert nut is located near the connection end of the reinforced concrete molded product. When molding this reinforced concrete molded product, the reinforcing bar and the insert nut are respectively arranged at predetermined positions in the mold. Then, the insert nut in the mold is located near the end of the reinforcing bar in the mold.

Therefore, the reinforcing bars in the mold are attached to the insert nuts in the mold and arranged at predetermined positions.
An annular member for fitting the end of the reinforcing bar is attached to the insert nut.
The insert nut with the annular member is fitted at the end of the reinforcing bar in the annular member, and is arranged at a predetermined position in the mold with the reinforcing bar attached. Then, a reinforcing bar is arrange | positioned in the predetermined position in the formwork fixed with the dimension of an insert nut with an annular member. In addition, the dimension of the insert nut with an annular member is selected in advance based on a predetermined position of the reinforcing bar.

An insert nut with an annular member constitutes a reinforcing bar placement tool that places a reinforcing bar at a predetermined position in a mold. If this reinforcing bar arrangement tool is used, the arrangement of reinforcing bars becomes simple.
Moreover, the annular member attached to the insert nut is buried in the concrete with the end of the reinforcing bar fitted. Do not expose to the outer surface of the reinforced concrete molding.

  The insert nut is connected to the annular member and the reinforcing bar inside the reinforced concrete molded product. The annular member and the reinforcing bar serve as a retaining portion for the insert nut. The insert nut has high fixing force and anchor force.

1 ) In a method of forming a reinforced concrete molded article with a connecting insert nut for arranging and connecting a large number of pieces,
In the formwork, place the reinforcing bars and the connecting insert nuts in their respective positions, put concrete, embed the reinforcing bars inside the concrete, embed the connecting insert nuts on the outer surface of the concrete, and insert the connecting insert nuts. A molding method in which an end face having a screw hole is exposed to the outer surface of concrete,
The connecting insert nut attaches an annular member that fits the end of the rebar,
Reinforcing bars are fitted with an annular member at the end,
The connecting insert nut with the annular member is fixed to the mold frame with the end of the reinforcing bar fitted into the annular member and arranged at a predetermined position in the mold frame. It is arranged at a predetermined position in a fixed formwork.
2 ) In reinforced concrete molded products with connecting insert nuts that connect and connect a large number of pieces,
Reinforced concrete molded products have a reinforcing bar embedded inside, a connecting insert nut is embedded in the vicinity of the connecting end of the outer surface, and the end surface where the screw hole of the connecting insert nut is opened is exposed on the outer surface.
An annular member is attached to the connecting insert nut, and the end of the reinforcing bar is fitted into the annular member.
The inside of the reinforced concrete molded product is characterized in that the annular member is buried in a state where the end of the reinforcing bar is fitted, and the reinforcing bar is arranged at a predetermined position determined by the dimensions of the connecting insert nut with the annular member.

The arrangement of the reinforcing bars becomes simple. The connecting insert nut has a high fixing force. The annular member is not exposed.

The perspective view of the reinforced concrete molded article and panel in the 1st example of the embodiment of the present invention. FIG. 2 is an enlarged sectional view taken along line AA in FIG. 1. It is an enlarged view of the connecting nut with an annular member of the reinforced concrete molded product, (a) is a plan view, (b) is a front view, (c) is a right side view. The top view of the formwork which shape | molds the same reinforced concrete molded product. BB sectional drawing of FIG. Sectional drawing which shows the middle of the arrangement | positioning of the nut for connection with an annular member, and a reinforcing bar to the same type frame. The perspective view of the reinforced concrete molded article and L-shaped block in the 2nd example of an embodiment. The right view which shows the relationship between the reinforcing bar in the same reinforced concrete molded article, and the nut for connection with an annular member. The top view of the formwork which shape | molds the same reinforced concrete molded product. CC sectional view taken on the line of FIG.

[First example (see FIGS. 1 to 6)]
As shown in FIG. 1, the reinforced concrete molded product of this example is a reinforced concrete plate 1 having a panel and a rectangular flat plate. This arranges and connects a large number of sheets to construct a retaining wall.

Configuration of Reinforced Concrete Plate 1 As shown in FIGS. 1 and 2, the reinforced concrete plate 1 is formed in a rectangular flat plate shape, and latticed reinforcing bars 2 and 3 are embedded therein. On the back surface, several connecting nuts 4 are embedded in the left and right connecting ends. The surface is formed with corrugated irregularities 5 having a landscape pattern. The grid-like reinforcing bars 2 and 3 are formed by assembling a large number of right and left round bar reinforcing bars 2 and a round bar reinforcing bar 3 in the direction perpendicular thereto in a grid pattern.

  The connecting nut 4 of the insert nut is exposed at the back surface of the reinforced concrete plate 1 at one end where the screw hole is opened, and the portion other than the exposed end surface is immersed in the reinforced concrete plate 1. An annular member 6 is attached to the immersed portion.

  As shown in FIG. 3, the annular member 6 is a washer of an annular plate, and the connecting nut 4 is a hexagonal nut. Washers and hexagon nuts are commercially available. The annular member 6 has a part of one surface fixed to a part of the outer peripheral surface of the connecting nut 4 by welding, and a major part other than the fixed part protrudes from the non-exposed end surface of the connecting nut 4. The center hole of the annular member 6 and the screw hole of the connecting nut 4 are orthogonal to each other. The central hole of the annular member 6 has its central axis arranged in the left-right direction.

  In the center hole of the annular member 6, the end of the left and right round bar reinforcing bar 2 of the grid-like reinforcing bar is fitted. In the grid-like reinforcing bars 2 and 3, the left and right end portions of several left and right direction round bar reinforcing bars 2 are respectively fitted in annular members 6 fixed to the connecting nut 4. The annular member 6 is buried in the reinforced concrete plate 1 with the end of the left and right round bar 2 inserted.

  The reinforced concrete plate 1 has the grid-like reinforcing bars 2 and 3 arranged at predetermined positions inside, and the distance between the outer surface such as the back and end faces and the grid-like reinforcing bars 2 and 3 and the cover thickness are set to predetermined values. In order to arrange the lattice reinforcing bars 2 and 3 at predetermined positions, the dimensions of the connecting nut 4 with the annular member 6 are selected in advance.

  The connecting nut 4 of the insert nut is connected to the annular member 6 and the reinforcing bars 2 and 3 inside the reinforced concrete plate 1. High fixing power.

Method of forming reinforced concrete plate 1 The reinforced concrete plate 1 is formed in an inverted state with the back side facing up.
As shown in FIGS. 4 and 5, the mold 11 has a flat box structure with an open upper surface. The inner bottom surface 12 is a wave-shaped uneven surface for forming the wave-shaped unevenness 5 on the surface of the reinforced concrete plate 1.

  Reinforcing bars 2 and 3 assembled in a lattice shape are placed in the mold 11. The lattice-like reinforcing bars 2 and 3 are fitted with annular members 6 fixed to the connecting nuts 4 at the left and right ends of several left and right round bar reinforcing bars 2, respectively.

  In the mold frame 11, rectangular insert nut arrangement pieces 13 are fixed to the upper ends of the left and right side plates with bolts 14, respectively, and the end portions of the insert nut arrangement pieces 13 protrude inward of the mold frame 11. The end portion of the insert nut arrangement piece 13 penetrates the mounting hole 16 through which the bolt 15 passes in the vertical direction.

  As shown in FIG. 6, the connecting nut 4 with the annular member 6 in the mold 11 is lifted, placed below the end of the insert nut arrangement piece 13, and attached to the connecting nut 4 with the annular member 6. Lift the rebars 2 and 3. The bolt 15 passes through the mounting hole 16 at the end of the insert nut arrangement piece 13 from above and is screwed into the connecting nut 4. The connecting nut 4 is fixed to the lower side of the end portion of the insert nut arrangement piece 13 with a bolt 15.

  As shown in FIGS. 4 and 5, the connecting nut 4 and the grid-like reinforcing bars 2 and 3 are arranged at predetermined positions in the mold 11, respectively. In the grid-like reinforcing bars 2 and 3, several left and right round bar reinforcing bars 2 are respectively fitted in the center holes of the annular member 6, and the radial movement of the left and right round bar reinforcing bars 2 is limited within an allowable range. The Moreover, the round bar rebar 3 at the end position orthogonal to the left and right direction round bar rebar 2 is adjacent to one surface of the annular member 6, and the movement in the left and right direction is limited within an allowable range. The grid-like reinforcing bars 2 and 3 are arranged at predetermined positions in the mold 11.

  In a state where the connecting nut 4 and the grid-like reinforcing bars 2 and 3 are arranged at predetermined positions in the mold 11, the concrete 11 is filled with raw concrete, and the upper surface of the concrete is leveled to connect the connecting nut 4. Match with the top surface of. After the concrete is cured, the bolt 15 is unscrewed from the connecting nut 4 and extracted. Further, the insert nut arrangement piece 13 is removed by removing the bolt 14. Thereafter, the mold is removed.

Reinforcing Bar Arrangement Tool The connecting nut 4 with the annular member 6 constitutes a reinforcing bar arrangement tool for arranging the latticed reinforcing bars 2 and 3 at predetermined positions in the mold 11.

[Second example (see FIGS. 7 to 10)]
As shown in FIG. 7, the reinforced concrete molded product of this example is a reinforced concrete plate 21 having an L-shaped block and a rectangular plate bent into an L shape. This arranges and connects many pieces to construct a retaining wall.

Configuration of L-shaped Reinforced Concrete Plate 21 As shown in FIGS. 7 and 8, the L-shaped reinforced concrete plate 21 is connected to the lower end of the back surface of the vertical plate serving as a retaining wall with a horizontal plate serving as a base. L-shaped grid-like reinforcing bars 22 and 23 are buried inside. On the back surface, several connecting nuts 4 are embedded in the left and right ends, respectively.

  The L-shaped grid-like reinforcing bars 22 and 23 are formed as a rectangular plate by assembling a large number of right and left round bar reinforcing bars 22 and a round bar reinforcing bar 23 perpendicular thereto, and the round bar reinforcing bar 23 is bent into an L shape. The shape is different.

  The connecting nut 4 of the insert nut has an end face at one end where a screw hole is opened exposed on the back surface of the reinforced concrete board 21, and a portion other than the exposed end face is immersed in the reinforced concrete board 21. An annular member 6 is attached to the immersed portion.

The connecting nut 4 with the annular member 6 is the same as that shown and described in FIG. 3 in the first example.
In the center hole of the annular member 6, the end of the left-right direction round bar reinforcing bar 22 of the L-shaped latticed reinforcing bar is fitted. The L-shaped grid-like reinforcing bars 22 and 23 are fitted into annular members 6 fixed to the connecting nut 4 at the left and right ends of several left and right direction round bar reinforcing bars 22, respectively. The annular member 6 is buried inside the L-shaped reinforced concrete plate 21 with the end of the left and right round bar 22 inserted.

  The L-shaped reinforced concrete plate 21 is provided with L-shaped grid-like reinforcing bars 22 and 23 at predetermined positions inside thereof, and the cover thickness is set to a predetermined value. In order to arrange the L-shaped lattice reinforcing bars 22 and 23 at predetermined positions, the dimensions of the connecting nut 4 with the annular member 6 are selected in advance.

  The connecting nut 4 of the insert nut is connected to the annular member 6 and the reinforcing bars 22 and 23 inside the L-shaped reinforced concrete plate 21. High fixing power.

Forming Method of L-shaped Reinforced Concrete Plate 21 The L-shaped reinforced concrete plate 21 is formed in an inverted state with the horizontal plate facing upward.
As shown in FIGS. 9 and 10, the mold frame includes a back surface forming plate 31 for forming the back surface side of the L-shaped reinforced concrete plate 21, a front surface forming plate 32 for forming the front surface side of the L-shaped reinforced concrete plate 21, and L-shaped reinforced concrete. It consists of an end surface forming plate 33 for forming the left and right end surfaces of the plate 21. The left and right end face molding plates 33 can be opened and closed, respectively. The back surface forming plate 31 passes through the mounting hole 16 through which the bolt 15 passes. The penetrating position of the mounting hole 16 is the mounting position of the connecting nut 4.

  The left and right end face molding plates 33 are opened. Between the back surface forming plate 31 and the front surface forming plate 32, L-shaped lattice reinforcing bars 22 and 23 are placed in an inverted state. The L-shaped grid-like reinforcing bars 22 and 23 are fitted with annular members 6 fixed to the connecting nuts 4 at the ends of several left and right round bar reinforcing bars 22, respectively. The connecting nut 4 with the annular member 6 is disposed in the opening of the attachment hole 16 on the inner surface of the back surface forming plate 31. The bolt 15 passes through the mounting hole 16 of the back surface forming plate 31 from the outer surface side of the back surface forming plate 31 and is screwed to the connecting nut 4. The connecting nut 4 is fixed to the inner surface of the back surface forming plate 31 with a bolt 15. Thereafter, the left and right end face molding plates 33 are closed.

  The connecting nut 4 and the L-shaped lattice reinforcing bars 22 and 23 are arranged at predetermined positions in the molds 31 to 33, respectively. In the L-shaped grid-like reinforcing bars 22 and 23, several left and right round bar reinforcing bars 22 are fitted in the center holes of the annular member 6, respectively, and the radial movement of the left and right round bar reinforcing bars 22 is within an allowable range. Limited to Further, the round bar rebar 23 at the end position orthogonal to the left and right direction round bar rebar 22 is adjacent to one surface of the annular member 6, and the movement in the left and right direction is limited within an allowable range. The L-shaped lattice reinforcing bars 22 and 23 are arranged at predetermined positions in the molds 31 to 33.

  Insert the ready-mixed concrete into the molds 31 to 33 with the connecting nut 4 and the L-shaped grid-like reinforcing bars 22 and 23 placed at predetermined positions in the molds 31 to 33 and the left and right end face forming plates 33 closed. And then level the top surface of the concrete. After the concrete is cured, the bolt 15 is unscrewed from the connecting nut 4 and extracted. Then demold.

Reinforcing Bar Arrangement Tool The connecting nut 4 with the annular member 6 constitutes a reinforcing bar arrangement tool for arranging the L-shaped grid-like reinforcing bars 22 and 23 at predetermined positions in the molds 31 and 32.

[Modification]
1) In the above embodiment, the annular member 6 is a circular ring plate, but is a square ring plate. The annular member 6 is a ring plate or a plate having a central hole, but is a wire curved in an annular shape or a rectangular shape.
2) In the above embodiment, the insert nut 4 is a hexagonal nut, but other square nuts or round nuts. In addition, the insert nut 4 is a nut having no retaining protrusion on the outer peripheral surface, but is a nut having a retaining protrusion on the outer peripheral surface.
3) In the above embodiment, the annular member 6 is fixed to the outer peripheral surface of the insert nut 4, but is fixed to the non-exposed end surface of the insert nut 4. The annular member 6 is fixedly attached to the insert nut 4 but is attached to the insert nut 4 so as to be rotatable around its central axis.

1 Panel, rectangular flat steel reinforced concrete plate 2, 3 Grid-shaped reinforcing bar 2 Horizontal round bar reinforcing bar 3 Horizontal round bar reinforcing bar 4 Connecting nut, insert nut, connecting insert nut, hexagon nut 5 Pattern, corrugated irregularity 6 Annular member, ring plate, washer 11 Form frame 12 inner bottom surface, corrugated irregular surface 13 Insert nut arrangement piece 14 Bolt 15 Bolt 16 Mounting hole 21 L-shaped block, L-shaped reinforced concrete plates 22, 23 L-shaped latticed reinforcing bars 22 Round bar reinforcing bars 23 in the left-right direction Round bar reinforcing bars 31 to 33 in the right-left direction in the left-right direction Mold frame 31 Back surface forming plate 32 Front surface forming plate 33 End surface forming plate

Claims (2)

In a method of forming a reinforced concrete molded article with a connecting insert nut for connecting a large number of pieces,
In the formwork, place the reinforcing bars and the connecting insert nuts in their respective positions, put concrete, embed the reinforcing bars inside the concrete, embed the connecting insert nuts on the outer surface of the concrete, and insert the connecting insert nuts. A molding method in which an end face having a screw hole is exposed to the outer surface of concrete,
The connecting insert nut attaches an annular member that fits the end of the rebar,
Reinforcing bars are fitted with an annular member at the end,
The connecting insert nut with the annular member is fixed to the mold frame with the end of the reinforcing bar fitted into the annular member and arranged at a predetermined position in the mold frame. A method for forming a reinforced concrete molded product, wherein the method is arranged at a predetermined position in a fixed formwork. In reinforced concrete molded products with connecting insert nuts that connect a large number of units,
Reinforced concrete molded products have a reinforcing bar embedded inside, a connecting insert nut is embedded in the vicinity of the connecting end of the outer surface, and the end surface where the screw hole of the connecting insert nut is opened is exposed on the outer surface.
An annular member is attached to the connecting insert nut, and the end of the reinforcing bar is fitted into the annular member.
Reinforced concrete, characterized in that inside the reinforced concrete molded product, an annular member is embedded with the end of the reinforcing bar fitted, and the reinforcing bar is placed at a predetermined position determined by the dimensions of the connecting insert nut with the annular member. Molding.

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