JPH06240665A - Treatment of head end of reinforced concrete structure - Google Patents

Abstract

PURPOSE:To expose the vertical reinforcement of a reinforcement cage by removing the unnecessary part of the head end of a reinforced concrete structure. CONSTITUTION:After a reinforcement cage 2 is inserted in an excavated hole 1 and concrete is placed, outer and inner partition members 6 and 9 released from manually-operated maintenance by a locking device 13 are developed by means of piano wires 5 and 10 and the upper and lower parts of the outer and inner partitioning members are partitioned from each other. After curing of placed concrete, the partitioned upper concrete lump-form substance is removed to expose a vertical reinforcement 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a head end of a concrete structure such as a cast-in-place concrete pile.

[0002]

2. Description of the Related Art When a foundation footing is formed on the head end of a cast-in-place concrete pile, it is necessary to remove the unnecessary portion of the concrete pile head end.

A conventional treatment method is disclosed in Japanese Patent Laid-Open No. 59-4.
As shown in Japanese Patent No. 8520, at the end of the concrete structure where the reinforcing bar is to be exposed, a separating member for separating the reinforcing bar to be exposed from the concrete is attached to form an annular wall body. Is embedded in concrete, and this concrete is divided into two layers, the inner and outer sides of the annular wall body, and after the setting concrete is hardened, the concrete at the head end of the pile is crushed, and the annular wall body is removed to reinforce the concrete. To expose.

[0004]

According to the above-mentioned method for treating the end portion of the structure, the annular wall body portion after hardening of the concrete which is cast by covering the respective reinforcing bars with the separating member forming the annular wall body is placed. Since the above concrete is crushed by using a concrete breaker or the like, there is a problem that a noise problem occurs, and that it takes a lot of time and effort to collect scattered concrete pieces.

Further, since the reinforcing bar is damaged when it is crushed by the impact tool, if the exposed reinforcing bar is used for the reinforcing bar of the basic footing, the strength is lowered.

Further, since the crushing surface of the concrete pile using the impact tool is a large uneven surface, there is a problem that it is necessary to carry out a burring work so as to be as flat as possible.

SUMMARY OF THE INVENTION An object of the present invention is to provide a head end processing method which facilitates setting of a cut line and can easily separate a head end unnecessary portion of a reinforced concrete structure. .

[0008]

In order to solve the above-mentioned problems, the present invention, when constructing a reinforced concrete structure such as cast-in-place, has an outer peripheral edge formed by a piano wire on the outer periphery of a predetermined upper position of a rebar cage. An outer partition member made of a flexible sheet that abuts against the wall and spreads like a brim is arranged, and the inner peripheral edge of the outer partition member is supported around the rebar cage by an appropriate method, and each through hole of the outer peripheral edge is provided. While supporting the vertical bars of the rebar cage through and supporting, a plurality of dividing edges are arranged at substantially the same level as the outer partition member, the flexible sheet-made inner partition member being closed in an overlap shape by a piano wire, and further, The outer peripheral edge of the manually operated outer partition member is locked by a radially outward locking device that is removably attached to a vertical bar at a predetermined position around the reinforcing steel car by an appropriate means, and is radially inwardly locked. After locking the divided edges of the inner partitioning member that was manually manipulated, cover the range from the upper ends of all the vertical bars to the inner partitioning member with covering material, and then after placing concrete. , Releasing the hand-operated state of the outer and inner partition members by the locking device by an operation from the outside, deploying the outer and inner partition members with the piano wire, and then curing the outer and inner partitions after setting concrete. The method employs a method of exposing the vertical streaks by pulling out and removing the upper concrete block of the member.

[0009]

[Function] When the outer and inner partition members are released from the hand-operated state by the locking device by an operation from the outside after the concrete is poured, the outer partition member is outwardly expanded by the piano wire to form a brim, and The inner partition members are deployed inward by the piano wire, and the dividing edges overlap each other to finally form a disk shape.

When the cast concrete is hardened, the wire is locked to the upper concrete lumps of the inner and outer partitioning members, and the wire after the locking is pulled upward while the upper concrete lumps of the inner and outer partitioning members are covered. Remove the member to expose the longitudinal bars of the cage.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 6, first, an excavator (for example, only an earth auger or a combination of a casing and an earth auger) is used to excavate from the ground to a predetermined depth in the ground. , The rebar cage 2 is inserted into the drilled hole 1 that has been excavated.

The rebar cage 2 has a large number of vertical bars 3,
The vertical stripes 3 are arranged from the upper part to the lower end of the vertical stripes 3 with a predetermined gap therebetween, and are constituted by annular stripes 4 fixed to the vertical stripes 3.

An outer partition member 6 made of a flexible sheet is arranged on the outer side of the upper portion of the rebar cage 2 so that the outer peripheral edge of the reed cage 2 spreads in a brim shape so as to contact the hole wall of the drilled hole 1.

The outer partition member 6 has the structure shown in FIGS.
As shown in FIG. 6, a plurality of flat flat arc-shaped tubes 7 made of a soft synthetic resin sheet (a release film for concrete is preferably provided on the surface) are arranged in a ring shape by end face butting, and at the The piano wire 5 was inserted through the inside of the peripheral edge, but one part of the ring-shaped tube was cut and the cut end was expanded, and the reinforcing bar cage 2
May be fitted to the outside of the car, or a ring-shaped tube may be fitted from the upper end of the reinforcing bar car 2. In this case, the piano wire 5 is a ring-shaped one that has been separated.

Further, the inner peripheral edge of the outer partition member 6 is supported on the outer periphery of the reinforcing bar car 2. In the case of the illustration, the outer partition member 6 is supported on the outer peripheral surface of the reinforcing bar cage 2 by connecting both ends of a single string 8 inserted through the inner peripheral edge of the outer partition member 6 to each other. Although the inner peripheral edge of the partition member 6 is pressed and supported, the tube may be stopped at each vertical line via a string or the like.

Reference numeral 9 denotes an inner partition member made of a flexible sheet in which a plurality of divided edges are closed by the piano wire 10 in an overlapping manner.

The above-mentioned inner partition member 9 is shown in FIGS.
As shown in FIG. 8, the piano wire 10 longer than the side edge is formed inside the bent straight edge of the two sets of flat semicircular sheets 11 that are vertically folded and folded in half. A cylindrical bag portion may be provided on the straight edge of the semicircular sheet, and a piano wire may be inserted into the bag portion.

Further, the semicircular edge of the sheet 11 supports the vertical stripe 3 through the through hole 12 of the arcuate edge.

Further, the outer partition member 6 is a reinforcing bar cage 2
The inner partitioning member 9 is manually operated toward the outer periphery of the rebar cage 2
While manipulating the inner periphery of the outer peripheral member of the outer partition member 6 and the dividing edge of the inner partition member 9 with a locking device 13 which is detachably attached to the vertical line 3 at a predetermined position. The state can be maintained and the lock can be released by an operation from the outside.

As shown in FIGS. 2 and 5, the locking device 13 has a cylindrical body 14 fitted on the outer side of the vertical streak 3 and screwed into the cylindrical body 14 before the inner partition member 9 is attached. A bolt 15 for stopping the cylindrical body 14 against the vertical stripe 3 by pressing the tip against the outer peripheral surface of the vertical stripe 3 with a horizontal arm 16 projecting radially outward and inward from the outer peripheral surface of the cylindrical body 14. , An L-shaped swinging side 18 in which the upper upper end is rotatably attached to the end faces of both arms 16 via pins 17.
And the operation string 19 connected to the lower end of the swing piece 18 and pulled outward from the upper end of the reinforcing bar car 2, and is attached to the outside of the swing piece 18 which is rotated in the hanging direction by its own weight and stopped. The outer peripheral edge of the partition member 6 is locked to the divided edges of the inner partition member 9 to maintain the manual operation state of the inner partition member 9 and the outer partition member 6, and the operation string 19 is pulled to swing in the standing direction. When the piece 18 is rotated, the outer partition member 6
From the outer peripheral edge of the inner partition member 9 to the swinging piece 1
8 is coming off.

As shown in FIGS. 1, 3 and 5, a horizontal guide cylinder 21 is provided on a cylinder body 14 at a required equal position around the reinforcing bar car 2, and a slide rod inserted into the guide cylinder 21. When the outer peripheral edge of the outer partition member 6 that has been manually manipulated is hooked on the outer end hook 23 of 22, the outer partition member 6 is prevented from hanging down, and when the outer partition member 6 is deployed toward the hole wall of the drilled hole 1, it slides. The rod 22 slides.

After attaching the inner partition member 9,
A space between the upper ends of all the vertical stripes 3 and the inner partition member 9 is covered by a cover member 24 that can be pulled out upward.

The cover member 24 may be a styrofoam cylinder closed at the upper end or a bag made of synthetic resin.

As described above, the outer partition member 6 and the inner partition member 9 are arranged on the outer side and the inner side of the rebar cage 2 before being inserted into the drilled hole 1, and as shown in FIG. 1, FIG. 2, FIG. 3, and FIG. As shown, the manually operated inner partition member 6 and the outer partition portion 9 are locked by the locking device 13.

Further, the covering member 24 covers the range from the inner partition member 9 to the upper end of each vertical stripe 3.

Then, after inserting the reinforcing steel cage 2 into the drilled hole 1, concrete is poured into the drilled hole 1 using a tremie pipe or the like.

After placing concrete (before hardening),
First, when the operation string 19 is pulled to release the manual operation maintenance of the inner partition member 9 and the outer partition member 6 by the locking device 13, as shown in FIGS. 8 and 9, the outer partition member 6 is removed by the piano wire 5. The outer peripheral edge of the outer partition member 6 that has spread is brought into contact with the hole wall of the drilled hole 1 while expanding in one direction.

Further, while the inner partition member 9 is expanded inward by the piano wire 10, the dividing edges of the inner partition member 9 overlap each other. As a result, the upper and lower parts of the outer partition member 6 and the inner partition member 9 of the concrete structure are separated.

When the cast concrete is hardened, earth and sand around the head end of the concrete structure are discharged, and then a wire is wound around the head end of the concrete structure, and the wound wire is pulled upward by a winch to form an outer partition. The upper concrete lumps of the member 6 and the inner partition member 9 are removed. Of course, the covering member 24 is also removed, and the upper end portion of the vertical stripe 3 is exposed.

In order to have flexibility with respect to the pulling force acting on both ends of the outer peripheral edge due to the manual operation of the inner partition member 9, as shown in FIG. 1 and FIG. It is preferable to stop the through hole 12 via 28.

[0032]

As described above, when the method according to the present invention is adopted, noise can be reduced and the unnecessary portions of the head end of the reinforced concrete structure can be removed very easily to expose the vertical streaks which are not damaged.

Further, the outer partition member and the inner partition member beautifully finish the remaining upper end surface of the structure, and the repair work becomes unnecessary.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional front view showing the main part of the above.

FIG. 3 is a plan view of the same as above.

FIG. 4 is an enlarged vertical sectional front view showing a slide rod.

FIG. 5 is an exploded perspective view of the above.

FIG. 6 is a perspective view of a tube.

FIG. 7 is a perspective view of a seat

FIG. 8 is a plan view showing a developed state of the outer partition member and the partition member.

FIG. 9 is an enlarged vertical front view of the above.

FIG. 10 is an enlarged side view of the same vertical section.

[Explanation of symbols]

 1 Drilled Hole 2 Reinforcing Bar Cage 3 Vertical Bar 4 Ring Bar 5 Piano Wire 6 Outer Partition Member 7 Tube 8 String 9 Inner Partition Member 10 Piano Wire 11 Sheet 12 Through Hole 13 Locking Device 14 Cylindrical Body 15 Bolt 16 Arm 17 Pin 18 Swing Moving piece 19 Operation string 24 Covering member

Claims (1)

[Claims] 1. When constructing a reinforced concrete structure such as cast-in-place, an outer partition member made of a flexible sheet is spread around the upper predetermined position of the reinforced cage outside the predetermined position by a piano wire so that the outer peripheral edge abuts the hole wall and spreads in a brim. While arranging, the inner peripheral edge of the outer partition member is supported around the reinforcing bar cage by an appropriate method, and the longitudinal bars of the reinforcing bar cage are supported through the through holes of the outer peripheral edge, and a plurality of divisions are made. An inner partition member made of a flexible sheet whose edge is closed by a piano wire in an overlapped manner is arranged at substantially the same level as the outer partition member, and is further detachably attached to the vertical bar at a predetermined position around the reinforcing bar car by an appropriate means. The outer peripheral edge of the manually operated outer partition member is locked to the radially outward locking device, and the manually operated split edge of the inner partition member is locked to the radially inward locking device. , Covering the range from the upper end of all the vertical bars to the inner partition member with covering material, and then
After pouring concrete, the outer and inner partition members are released from the manual operation of the outer and inner partition members by the locking device by an operation from the outside, and the outer and inner partition members are expanded by the piano wire to harden the concrete. A method for treating the head end of a reinforced concrete structure, characterized in that the upper concrete lumps of the outer and inner partitioning members are subsequently pulled out and removed to expose the vertical streaks.