JP2006257796A - Reinforced cage support ring of prestressed concrete pole and method of manufacturing prestressed concrete pole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support ring for holding a reinforced cage of a prestressed concrete pole in a predetermined position. <P>SOLUTION: In this reinforced cage support ring 16 of the prestressed concrete pole 11, the support ring 16 has a ring-shaped body 16a and a plurality of holding parts 16b formed in a substantially equal position in the peripheral direction of the outer periphery of the ring-shaped body. A plurality of support rings 16 are arranged in a substantially concentric state with the reinforced cage in a predetermined pitch position in the longitudinal direction of the reinforced cage. A plurality of longitudinal directional reinforcements 2a are respectively held in a circumferential position of a predetermined diameter by the plurality of holding parts 16b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a reinforcing bar support ring used when producing a prestressed concrete pole, and a method for producing a prestressed concrete pole.

  The prestressed concrete pole has a so-called reinforcing bar 1 as shown in FIG. 1 embedded in the concrete pole body. The reinforcing bar 1 is composed of a plurality of tension bars 2a and spiral bars 3 (all of which are reinforcing bars) that are arranged at substantially equal positions in the circumferential direction, and a plurality of types for improving the bending moment of the concrete pole. Non-tensile muscles (for convenience, only two types of non-tensile muscles 2b and 2c are shown in FIG. 1) are assembled to form a hook-like shape as a whole. Hereinafter, the tendon 2a and the non-tensors 2b and 2c are appropriately referred to as longitudinal reinforcing bars.

    Next, a conventional method for manufacturing a prestressed concrete pole will be described with reference to FIGS. In FIG. 2 and FIG. 3, a plurality of tendon muscles 2 a are arranged and attached between the main port fixing plate 4 and the end port fixing plate 5 having a predetermined outer diameter, which constitute a part of the tensioner, arranged at predetermined intervals. The tension muscles 2a are tensioned by the tension devices 6 and 7 in the longitudinal direction. Next, in FIG. 4, the spiral muscles 3 are sequentially wound around the outer circumferences of the plurality of tension muscles 2 a, and as shown in FIG. 9, the tension muscles 2 a and the spiral muscles 3 are braided at predetermined intervals so that the spiral muscles 3 are not loosened. The non-tensioned muscles 2b and 2c are also appropriately secured at the same time to form the reinforcing bar 1 as described above.

  Subsequently, in FIG. 5, the reinforcing bar 1 is once removed from the tensioners 4 to 7, moved and attached into the lower mold 9 a as shown in FIG. 6, and a plurality of tension bars 2 a are pulled again by the tensioner. The concrete 10 is poured into the lower mold 9a in a tensioned state. Subsequently, the upper mold 9b is attached to complete the mold 9, and further concrete is poured and solidified. After that, when the concrete pole is removed from the formwork, the tension bar 2a that has been pulled is contracted to give prestress to the concrete pole, and the prestressed concrete pole 11 (see FIG. 8) is completed.

The conventional method has the following problems.
(1) Although FIG. 10 shows the cross-sectional shape of the arbitrary position of the concrete pole 11 shown in FIG. 8, the tension | tensile_strength reinforcement 2a (or non-tensile reinforcement 2b or 2c) as several longitudinal direction reinforcing bars is in the concrete 10, It is required that the radial distances r from the center of the pole 11 have the same predetermined dimensions and the angles θ are also equal. However, after the longitudinal rebar and the spiral muscle 3 are fixed by the barb wire 8 in the process of FIG. 4, the torsion of the tendon 2a is released in the process of FIG. As a result, the overall shape is deformed. For this reason, as shown in FIG. 11, the arrangement radius distance r (r1, r2) of the reinforcing bar is not uniform and the angle θ (θ1, θ2) is not uniform, and in a severe case, the reinforcing bar is exposed from the concrete surface. As a result, the reliability and durability of the concrete pole itself deteriorated.

  (2) Further, as described above, in the step of FIG. 5, the reinforcing bar 1 is removed from the tensioner and the tension force is released, so that a plurality of longitudinal reinforcing bars are caused by their own weight as shown in FIG. It hangs down from the normal position 2a (2b, 2c) to the hanging position 2a ′ (2b ′, 2c ′). For this reason, there is a problem in that the reinforcing bar 1 is bent and deformed and loses its shape, and even if it is re-tensioned in the mold 9, it cannot be restored to its normal shape and remains out of shape.

  In order to achieve the above object, the reinforcing ring support ring of the prestressed concrete pole of the present invention is prestressed by being pulled in the longitudinal direction, and is disposed at a substantially equal position in the circumferential direction on the circumference of a predetermined diameter. A reinforcing bar rod (15) formed by wrapping a spiral bar (3) around the outer circumferences of a plurality of longitudinal bars (2a, 2b, 2c) is mounted in a mold (9), and then concrete (10 ) Of a prestressed concrete pole (11) formed by pouring and solidifying, and the support ring (16) includes a ring-shaped body (16a) and the ring-shaped body. A plurality of holding portions (16b) formed at substantially equal positions in the circumferential direction of the outer periphery of the outer periphery of the reinforcing bar rod, and a plurality of the support rings (16) at the predetermined pitch position in the longitudinal direction of the reinforcing bar rod (15). It is disposed substantially concentric, characterized in that retaining the plurality of longitudinal reinforcing bars by the holding portion of the plurality of (16b) (2a, 2b, 2c) of the circumference on the respective positions of the predetermined diameter.

  Preferably, the holding portion (16b) includes a pair of cut-and-raised portions (16b) obtained by cutting and raising both sides of the circumferentially approximately equal position portion of the ring-shaped main body (16a) radially outwardly. After the longitudinal reinforcing bars (2a, 2b, 2c) are inserted between the pair of cut-and-raised portions (16b), the pair of cut-and-raised portions (16b) are caulked and deformed in directions close to each other, and the longitudinal direction Reinforcing bars (2a, 2b, 2c) are held.

Preferably, the holding portion (16b) is formed by welding or screwing a holding member, which is a member different from the ring-shaped main body (16a), to the ring-shaped main body 16a.
Preferably, the ring-shaped body (16a) has a substantially U-shaped or U-shaped cross section.

Preferably, the longitudinal reinforcing bars (2a, 2b, 2c) include a tendon (2a) and a non-tension (2b, 2c).
Moreover, the manufacturing method of the prestressed concrete pole which becomes this invention is (1) While arrange | positioning several longitudinal direction reinforcing bars in the circumferential direction substantially equal position on the circumference of a predetermined diameter, 7) Pulling the plurality of longitudinal rebars (2a, 2b, 2c) in the longitudinal direction and applying prestress; (2) Spiral rebars on the outer periphery of the plurality of longitudinal rebars (2a, 2b, 2c) (3) winding the reinforcing bar rod (15) to form the reinforcing bar rod (15); (3) removing the reinforcing bar rod (15) from the tensioner (4, 5, 6, 7) and releasing the prestress; A step of pre-stressing by attaching the ridges in the mold (9) again in the longitudinal direction; (4) pouring concrete (10) into the mold (9) and solidifying the mold (5); ) Is solidified concrete formwork? A method for producing a prestressed concrete pole comprising the step of removing to obtain a prestressed concrete pole (11 '), wherein the plurality of longitudinal reinforcing bars (2a, 2b, 2c) of (1) are arranged on a circumference of a predetermined diameter. A plurality of ring-shaped main bodies (16a) and a holding portion (16b) fixed to the outer circumferential direction of the ring-shaped main body (16a). The support ring (16) is disposed substantially concentrically with the reinforcing bar rod at a predetermined pitch position in the longitudinal direction of the reinforcing bar rod (15), and the longitudinal reinforcing bars (2a, 2b, 2c), respectively, to further hold the plurality of longitudinal reinforcing bars (2a, 2b, 2c) on the circumference of the predetermined diameter.

  Preferably, the longitudinal rebar (2a, 2b, 2c) includes a tendon (2a) and a non-tension (2b, 2c).

Effects of the present invention

According to the support ring of the reinforcing bar rod of the prestressed concrete pole of the present invention, the plurality of the support rings are arranged substantially concentrically with the reinforcing bar rod at a predetermined pitch position in the longitudinal direction of the reinforcing bar rod, Since the plurality of longitudinal reinforcing bars are respectively held at predetermined positions, the following effects can be obtained.
(1) Since the longitudinal reinforcing bar is held at a predetermined position by the holding portion of the support ring in the middle of removing the reinforcing bar from the tensioner and moving to the formwork 9, the reinforcing bar is as if there is no support ring. However, the tension force is released, and there is no reduction / twisting deformation, and the arrangement radius r and the adjacent angle θ of the longitudinal reinforcing bars can be made uniform, and the reliability and durability of the concrete pole itself can be improved.
(2) Further, when the reinforcing bar rod is released from the tension force, the plurality of longitudinal reinforcing bars are held in place by the support ring, so that the reinforcing bar hangs down from the normal position by its own weight as in the case where there is no support ring. Thus, there is an advantage that the reliability of the product can be improved without the reinforcing bar rod being bent and deformed.

  FIG. 13 shows an example of a reinforcing bar rod to which one embodiment of the support ring of the reinforcing bar rod of the prestressed concrete pole according to the present invention is applied. In FIG. 13, the same parts as those in FIG. The description is omitted.

  In FIG. 13, the reinforcing bar rod 15 has a plurality of diameters different from each other at a plurality of predetermined pitch positions in the longitudinal direction of the reinforcing bar rod and concentrically with the reinforcing bar rod compared to the reinforcing bar rod 1 in FIG. 1. Intermediate support rings 16-1, 16-2, 16-3,... Are provided to support or hold the tendon muscle 2a and the non-tensile muscles 2b, 2c.

  FIG. 14 shows four intermediate support rings 16-1, 16-2, 16-3, 16-4 as representatives of the plurality of intermediate support rings 16. Of course, if there are two or more, the number is 4 The number is not limited to 5 and may be 5 or more.

  FIG. 15 shows the intermediate support ring 16 as a representative. The intermediate support ring 16 has a U-shaped cross section (see FIG. 17) or a U-shaped cross section, and retains a pair of radially outward cuts in the circumferential direction of the ring body 16a having a predetermined diameter, for example, at 12 equal positions. A portion 16b (also see FIG. 17) is provided.

Next, a method for manufacturing a prestressed concrete pole using the reinforcing bar 15 will be described.
First, the method for manufacturing the reinforcing bar rod 15 before attaching the plurality of intermediate support rings 16 is exactly the same as the method for manufacturing the reinforcing bar rod 1 of FIGS. 2 and 3 in the conventional process.

  Subsequently, in the process corresponding to FIG. 4 of the conventional process, when the reinforcing bar 2a is tensed to form a reinforcing bar, a plurality of intermediate support rings 16-1, 16-2,. They are arranged substantially concentrically with the reinforcing bar rods at predetermined pitch positions in the longitudinal direction.

  At that time, as shown in FIG. 17, the pair of cut-and-raised holding portions 16b is inserted into the corresponding tendon 2a (or the non-tensile muscle 2b or 2c), and the pair of cut-and-raised The holding part 16b is caulked and deformed in a direction approaching each other, and the tendon muscle 2a (or the non-tension muscle 2b or 2c) is held and locked. This locking operation is performed in each pair of raised and raised holding portions 16b of each intermediate support ring to obtain the configuration of the reinforcing bar rod 15 shown in FIG.

  Subsequently, as in FIG. 5 of the conventional process, after the reinforcing bar 15 is removed from the tensioner, the reinforcing bar 15 is placed in the mold 9 and the concrete 10 is poured, as in the processes of FIGS. 6 and 7. A concrete pole 11 ′ (shown by borrowing FIG. 8) similar to the concrete pole 11 is obtained.

  According to this, in the middle of moving the rebar bar 15 from the tensioner and moving to the mold 9, the longitudinal bar 2a of the bar bar tends to be reduced and deformed by releasing the tension, or the longitudinal bars 2a to 2c. However, each reinforcing bar is firmly held at a predetermined position by the holding portion 16b of the intermediate support ring 16, even though the reinforcing bar hangs down from its normal position due to its own weight, and the reinforcing bar rod tends to be deformed due to deformation. Both the arrangement radius r and the adjacent angle θ of the longitudinal reinforcing bars 2a to 2c can be kept uniform.

  In the above embodiment, in FIG. 17, the holding portion 16b cuts and raises the support ring main body 16a to form a pair of cut and raised holding portions 16b. However, the present invention is not limited to this and is separate from the support ring main body 16a. A holding member having a circular arc shape (or a U shape or a U shape) may be fixed to the support ring body 16a by welding or screwing.

  Further, as an example of the arrangement of the intermediate support ring 16, for example, a concrete pole having an overall length of usually 6 to 17 m, for example, a diameter of 10 to 18 cm, and the intermediate support ring 16 of the concrete pole is arranged for every 1 m of the pole. ,

It is a perspective view of the rebar bar of the conventional prestressed concrete pole, its tentacle and non-tendon. It is the schematic of the 1st step of the manufacturing process of this prestressed concrete pole to which the reinforcement bar of the conventional prestressed concrete pole is applied. It is the schematic of the 2nd step of the said conventional manufacturing process. It is the schematic of the 3rd step of the said conventional manufacturing process. It is the schematic of the 4th step of the said conventional manufacturing process. It is the schematic of the 5th step of the said conventional manufacturing process. It is the schematic of the 6th step of the said conventional manufacturing process. It is a perspective view of the prestressed concrete pole obtained by the said conventional manufacturing process. It is the schematic which shows the mode of the caulking which is the principal part of the said 3rd step of the said conventional manufacturing process. It is sectional drawing when the prestressed concrete pole of FIG. 8 is a normal state. It is sectional drawing when the prestressed concrete pole of FIG. 8 is in a malfunctioning state. FIG. 9 is a cross-sectional view of the prestressed concrete pole of FIG. 8 when the reinforcing bar is in a suspended state. FIG. 3 is a perspective view of the reinforcing bar rod according to one embodiment of the support ring of the reinforcing bar rod of the prestressed concrete pole according to the present invention, and the tension and non-tension muscles thereof. It is a top view of the some support ring used for the reinforcing bar rod of FIG. It is an enlarged plan view of one supporting ring used for the reinforcing bar rod of FIG. It is a side view of the support ring of FIG. It is a perspective view of the principal part of the support ring of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,15 Reinforcing rod 2a Tensile muscle 2b, 2c Non-tension muscle 2a ', 2b', 2c 'Rebar hanging position 3 Spiral muscle 4, 5 Fixing plate (tensioner)
6, 7 Tensioner 8 Overlock wire 9 (9a, 9b) Form 10 Concrete 11, 11 'Prestressed concrete poles 16-1, 16-2, 16-3 ... (intermediate) support ring 16a support ring body 16b Rebar holding part

Claims (7)

A spiral bar (3) is provided on the outer circumference of a plurality of longitudinal bars (2a, 2b, 2c) which are pulled in the longitudinal direction and are prestressed and arranged at substantially equal positions in the circumferential direction on the circumference of a predetermined diameter. Reinforced rod of prestressed concrete pole (11 ') formed by pouring concrete (10) into the mold and solidifying it after the reinforcing rod (15) formed by winding is installed in the mold (9) A support ring (16) of
The support ring (16) includes a ring-shaped main body (16a) and a plurality of holding portions (16b) formed at substantially equal circumferential positions on the outer periphery of the ring-shaped main body. (16) is disposed substantially concentrically with the reinforcing bar rod at a predetermined pitch position in the longitudinal direction of the reinforcing bar rod (15), and the plurality of longitudinal reinforcing bars (2a, 2b, 2c) are provided by the plurality of holding portions (16b). Is held at a position on the circumference of the predetermined diameter, respectively. In the support ring of the reinforcing bar rod of the prestressed concrete pole according to claim 1,
The holding portion (16b) includes a pair of cut-and-raised portions (16b) obtained by cutting and raising both sides of the ring-shaped main body (16a) in the circumferentially approximately equal position portion in the radial direction. After the longitudinal reinforcing bars (2a, 2b, 2c) are inserted between the cut-and-raised portions (16b), the pair of cut-and-raised portions (16b) are caulked and deformed in the directions close to each other, and the longitudinal-direction reinforcing bars (2a 2b, 2c), a support ring for reinforcing bar rods of prestressed concrete poles. In the support ring of the reinforcing bar rod of the prestressed concrete pole according to claim 1,
The holding portion (16b) is formed of a reinforcing bar made of a prestressed concrete pole formed by welding or screwing a holding member, which is a member different from the ring-shaped main body (16a), to the ring-shaped main body 16a. Support ring. In the support ring of the reinforcing bar rod of the prestressed concrete pole according to any one of claims 1 to 3,
The ring-shaped main body (16a) has a substantially U-shaped or U-shaped cross section, and is a support ring for a reinforcing bar rod of a prestressed concrete pole. In the support ring of the reinforcing bar rod of the prestressed concrete pole according to any one of claims 1 to 4,
The longitudinal reinforcement (2a, 2b, 2c) includes a tension bar (2a) and a non-tension bar (2b, 2c). (1) A plurality of longitudinal reinforcing bars are arranged at substantially equal positions in the circumferential direction on the circumference of a predetermined diameter, and the plurality of longitudinal reinforcing bars (2a, 2b, Applying a prestress by pulling 2c) longitudinally;
(2) forming a reinforcing bar rod (15) by wrapping a spiral bar (3) around the outer periphery of the plurality of longitudinal bars (2a, 2b, 2c);
(3) After removing the rebar rod (15) from the tensioner (4, 5, 6, 7) to release the prestress, the rebar rod is attached in the mold (9) and then pulled in the longitudinal direction again. Pre-stressing steps,
(4) pouring concrete (10) into the mold (9) to solidify;
(5) A method for producing a prestressed concrete pole, comprising the step of removing the solidified concrete from the mold and obtaining a prestressed concrete pole (11 '),
In the step of arranging the plurality of longitudinal rebars (2a, 2b, 2c) in (1) at substantially equal positions in the circumferential direction on the circumference of a predetermined diameter, the ring-shaped main body (16a) A plurality of support rings (16) having holding portions (16b) fixed at substantially equal circumferential positions on the outer periphery of 16a) are substantially the same as the reinforcing bar rods at a predetermined pitch position in the longitudinal direction of the reinforcing bar rods (15). The plurality of longitudinal rebars (2a, 2b, 2c) are arranged in a concentric state, and each of the longitudinal rebars (2a, 2b, 2c) is held by the respective holding portions (16b). Further comprising the step of holding on the circumference of
A method for producing a prestressed concrete pole, wherein In the manufacturing method of the prestressed concrete pole of Claim 5,
Said method, characterized in that said longitudinal rebar (2a, 2b, 2c) comprises a tendon (2a) and a non-tension (2b, 2c).

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