JPH1150595A - Cage body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate erection by binding PC strands arranged into a planar circular shape at proper intervals with reinforcing rings in the longitudinal direction on the inside of the circle, and winding spiral bars on the outside of the PC strands. SOLUTION: PC strands with a proper length and arranged into a planar circular shape at proper intervals are bound by reinforcing rings arranged on the inside of the circle, and spiral bars 4 are wound on the outer face to form a cage body 1. The PC strands 2 are made of a PC twisted wire applied with the rustproof process, the outer periphery of an insulated conductor 7 and side wires 8 is covered with an inner tube 9 coated with a synthetic resin powder paint, the outer periphery of the inner tube 9 is doubly covered with an intermediate tube 10 and an outer tube 11 made of a synthetic resin, and a lubricant is filled. The cage body 1 is erected in excavated holes while being bent in an optional direction, concrete is placed, then the PC strands 2 are stretched to apply prestress after the concrete is hardened. The cage body 1 can be easily erected in narrow work spaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a basket.

[0002]

2. Description of the Related Art A cast-in-place concrete pile is provided with an excavation hole 19 in the ground as shown in FIG. However, as shown in (2) of the figure, in the case of a narrow work space 21 having an obstacle above, the rebar basket 20 is shortened and built.

[0003]

However, such a construction as described above has a problem that the reinforcing bar is shortened, so that the construction is complicated and time-consuming.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide a basket body that can be easily built even in a narrow work space having an obstacle above. .

[0005]

According to a cage for solving the above problems, PC strands arranged in a plane circular shape at appropriate intervals are arranged at appropriate intervals in a longitudinal direction inside a circle. It is characterized in that it is bound by a reinforcing ring, and a spiral streak is wound around the PC strand. The cage body according to claim 4 is a reinforcing ring in which PC strands bent in a U-turn shape are arranged in a plane circular shape at appropriate intervals, and the PC strands are arranged at appropriate intervals in the longitudinal direction inside the circle. Bound and the PC
It is characterized in that a spiral streak is wound around the outside of the strand.

The cage formed by the PC strand and the spiral streaks can bend in any direction by the flexibility of the PC strand and the spiral streaks.

The PC strand for applying the prestress also serves as a vertical streak.

[0008] Since the PC strand also serves as a vertical streak,
It becomes a cage body of a predetermined length without a joint.

[0009] Since the outer tube is peeled off from the tip of the PC strand and the wire is exposed from the PC steel, the adhesive strength to concrete is increased.

[0010] By bending the PC strand into a U-turn, a crimping grip is not required.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cage will be described in detail below with reference to the drawings, and then a method of arranging the cage will be described. FIG. 1 is a plan view of the cage, and FIG. 2 is a front view of the same.

The cage 1 comprises a PC strand 2 and a reinforcing ring 3
And a PC strand 2 of an appropriate length, which is composed of a spiral streak 4 and is arranged in a plane circular shape at an appropriate interval,
Together with the reinforcing ring 3 arranged inside the circle,
A spiral streak 4 is wound around the outer surface of the PC strand 2. The spiral streak 4 tightens the PC strand 2 from the outside and is fixed to the reinforcing ring 3 with a binding wire 5.

The PC strand 2 is, as shown in FIG.
The rust-proofed PC steel strand 6 is used, and the outer circumferences of the core wire 7 and the side wire 8 are respectively covered with an inner cylinder 9 of a synthetic resin powder paint, and the outer circumference of the inner cylinder 9 is made of a synthetic resin. The cylinder 10 and the outer cylinder 11 are double-coated,
A lubricant 12 such as grease is filled between the outer cylinder 11 and the outer cylinder 11.

The distal end of the PC strand 2 is
1 and the middle cylinder 10 are peeled off to expose the PC stranded wire 6, and the crimping grip 13 is attached. The PC steel strand 6 is covered with an inner cylinder 9 and subjected to a rust-proofing treatment. Since the inner cylinder 9 is formed of a synthetic resin powder coating, the adhesive strength to concrete is increased.

As described above, since the PC strand 2 in place of the vertical streak and the spiral streak 4 in place of the hoop streak in the conventional reinforcing bar cage are both flexible, they can be bent in any direction, and can be bent in a wave shape, for example. Become.

FIG. 4 shows a cage 1 using a PC strand 2 bent in a U-turn. The other configuration except that the tip is bent in a U-turn is the same as that of the cage 1 described above.
This is the same configuration as. This is because the crimping grip 13 becomes unnecessary because the tip is bent in a U-turn shape, and the outer cylinder 11 and the middle cylinder 10 of the U-turn section are peeled off, so that the adhesive force with the concrete is the above-mentioned cage. Better than 1. When the distal end is bent in a U-turn, the outer tube 11 and the middle tube 10 do not need to be peeled.

FIG. 5 shows a cage 1 in which a crimping grip 13 is attached from above the outer cylinder 11 without peeling off the outer cylinder 11 and the middle cylinder 10 at the distal end of the PC strand 2. Since it becomes a reaction force when the prestress is applied, the PC strand 2 can be used also as a tensile member.

Hereinafter, a description will be given of a method of erection of the above-mentioned basket body on a support pile formed in a narrow place of the working space. First, the PC strand 2 wound on the reel 14,
The necessary number of reinforcing rings 3 and spiral streaks 4 are separately transported to the site.

The PC strand 2 and the reinforcing ring 3
Then, the spiral muscle 4 is carried into the narrow work space 16 below the platform 15 as shown in FIG. Therefore, the PC strand 2 is pulled out from the reel 14 and cut to a required length.
Is peeled off and the pressure grip 13 is attached.

Next, the PC strands 2 arranged in a plane circle at appropriate intervals are bound by a reinforcing ring 3 arranged inside at an appropriate interval. Spiral streaks 4 are wound around the bound PC strands 2 to form a cage 1 that can bend in any direction.

Then, the cage 1 formed in such a narrow working space 16 is bent in an arbitrary direction, and
And concrete 18 is poured. When the concrete 18 has hardened, the PC strand 2 which is also used as a vertical streak is tensioned to apply necessary prestress. Thus, since the PC strand 2 also serves as the vertical streak, it is not necessary to rewire the prestressing tensile material into the excavation hole 17.

As described above, when the basket 1 is built,
Although the description has been made using the support piles formed in the narrow work space 16, it is assumed that prestressed concrete columns are built in the same manner.

[0023]

The cage formed by the PC strand and the spiral streaks can be freely bent in any direction by the flexibility of the PC strand and the spiral streaks.

Since the cage can be bent in an arbitrary direction, the cage can be easily built in the excavation hole or the mold even in a site where the working space is narrow.

The PC strand for applying the prestress can also serve as a vertical streak.

Since the PC strand also serves as a vertical streak,
A cage of a predetermined length can be formed without a joint.

The outer end of the PC strand is exfoliated from the outer cylinder and the PC strand is exposed, so that the adhesive strength to concrete is increased.

Since the PC strand is bent in a U-turn, a crimping grip is not required.

[Brief description of the drawings]

FIG. 1 is a plan view of a cage.

FIG. 2 is a sectional view of a cage.

FIG. 3 is a sectional view of a PC strand.

FIG. 4A is a plan view of another cage body, and FIG. 4B is a sectional view of the same cage.

5 (1) is a plan view of another cage body, and FIG. 5 (2) is a cross-sectional view thereof.

FIG. 6 is a cross-sectional view in which a cage is erected in an excavation hole of a support pile.

FIG. 7 is a cross-sectional view in which a reinforcing cage is erected in an excavation hole of a support pile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Basket body 2 PC strand 3 Reinforcement ring 4 Spiral streak 5 Binding wire 13 Crimping grip 16, 21 Work space 17, 19 Drilling hole

Claims (5)

[Claims] 1. PC strands arranged in a plane circular shape at appropriate intervals are bound by reinforcing rings arranged at appropriate intervals in the longitudinal direction inside the circle, and spiral streaks are provided outside the PC strands. A cage body formed by being wound. 2. A crimping grip is attached to a tip of the PC strand.
The basket described in the above. 3. The cage according to claim 1, wherein an outer cylinder is peeled off from an end of the PC strand, and a strand of PC steel is exposed. 4. PC strands bent in a U-turn shape are arranged in a plane circular shape at appropriate intervals, and the PC strands are bound by reinforcing rings arranged at appropriate intervals in the longitudinal direction on the inner side of the circle. A cage body formed by winding spiral streaks around the outside of the PC strand. 5. The cage according to claim 4, wherein the U-turn-shaped bent portion of the PC strand is in a state in which an outer cylinder is peeled off and a strand of PC steel is exposed.