JP2002212960A - Pile head reinforcement unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile head reinforcement unit which suppresses strength degradation and welding stress occurrence at base portions of a column and a wall, where a shearing force is largely applied, thereby ensuring the durability thereof as a structure, has structural elasticity imparted thereto, thereby improving the working efficiency thereof, and therefore constructs a structure excellent in reliability. SOLUTION: The pile head reinforcement unit 10 has a long body with its lower portion embedded in a foundation of the structure via concrete, and comprised of (a) a plurality of rod-like main reinforcements 11, (b) a spiral hoop 12, (c) a cotter bar 16, and (d) rod-like cotter engaging bars 13, 14. The main reinforcements 11 are vertically arranged in parallel with each other. The hoop 12 is wound along the periphery of the main reinforcements 11 which are embedded in the foundation, and has its upper end bound to upper portions of the main reinforcements 11 via a binding means while its lower end bound to lower ends of the main reinforcements 11. The cotter bar 16 is arranged almost orthogonally to the main reinforcements 11 in the vicinity of the upper end of the hoop 12. The cotter engaging bars 13, 14 are arranged in parallel with a longitudinal direction of the main reinforcements and have their upper ends fixed to the cotter bar 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a pile foundation for structures such as houses, factories, piers, etc., and enhances the supporting force of pillars and walls to improve durability and improve work efficiency during construction. The present invention relates to a pile head reinforcement unit that can be improved.

[0002]

2. Description of the Related Art Generally, structures such as houses, factories, and piers are
It is supported on the ground by a pile foundation that supports columns and walls of the structure. Such a pile foundation is composed of a concrete structure reinforced by a pile head reinforcement unit composed of a reinforcing frame or the like disposed inside a pile or the like, and a pillar or wall of a house or the like on the pile foundation is formed. It supports against gravity and shear force acting on it.

A conventional pile head reinforcement unit and a method of constructing a pile using the same will be described below with reference to the drawings.
FIG. 9 is a partial sectional view showing a state before installation of a conventional pile head reinforcing bar unit applied to a pile foundation, and FIG. 10 is a partial sectional view showing a state after the installation. 9 and 10, 50 is a conventional pile head reinforcement unit,
51 is a main bar formed of a plurality of deformed reinforcing bars, 52 is a hoop bar formed in a spiral shape, wound around the outer periphery of the plurality of main bars 51, and a contact point with the main bar 51 is fixed by a welded portion X;
53 is a ready-mixed concrete receiving portion for holding the ready-mixed concrete supplied from the upper side by a concrete mixer or the like, and 54 is a concrete pile (hereinafter abbreviated as a pile) into which the lower part of the pile head reinforcing bar unit 50 is inserted and is drilled in the ground. ) And 55 are kansashi muscles provided at an intermediate portion of the main muscle 51 locked at the upper end of the pile 54. In the case of constructing a pile foundation using the conventional pile head reinforcement unit 50, first, as shown in FIG. 9, the horizontally projecting portion of the kansashi bar 55 is placed on the upper end of the pile 54 to support the whole. Let me
The pile head reinforcement unit 50 is arranged at the pile head in the pile 54. Next, a mold (not shown) is arranged around the pile head reinforcing bar unit 50 at a predetermined interval, and ready-mixed concrete is poured into this interval to be hardened. By removing the formwork, as shown in FIG. 10, the pile head reinforcing bar unit 50 was buried in the cast concrete 56 to construct a pillar portion or the like of a structure reinforced.

[0004]

However, the pile head reinforcing bar unit 50 applied to the conventional pile foundation has the following problems. (1) At the base of a column or a wall to which a large shearing force is applied, the upper end of the hoop streak 52 or the kansashi streak 55 is the main streak 51
Is fixed at the welded portion X, so that the main reinforcement 51
However, there is a problem in that the durability of the structure is reduced due to the occurrence of residual stress (welding stress) due to the strength deterioration due to heat during welding and the prevention of free deformation when the weld metal cools and contracts. Was. (2) The upper end of the hoop muscle 52 and the kansashi muscle 55 are the main muscle 5
1 is strongly fixed via the welded portion X, so that the structure itself of the pile head reinforcing bar unit 50 has poor elasticity and flexibility, and the joint portion of this weld is accompanied by movement and handling during construction. However, there is a problem that the work efficiency is deteriorated and the work efficiency in construction is deteriorated. (3) Since the base of the pile head on which the shear force acts particularly, that is, the upper portion of the hoop streak 52, that is, the upper portion of the hoop streak 52, is directly fixed to the main streak 51 by welding, it is vibrated using a vibrator or the like. Vibration cannot be transmitted effectively when concrete is poured into the formwork, and the filling of the ready-mixed concrete around the rebar becomes uneven and defects are likely to occur, so construct a highly reliable structure. There was a problem that it was difficult to secure sufficient safety against disasters such as earthquakes.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and prevents mechanical strength (particularly bending and compressive stresses) by preventing strength deterioration and welding stress at the base of a column or wall to which a large shearing force is applied. ) While improving productivity,
Equipped with structural elasticity to improve work efficiency in construction,
An object of the present invention is to provide a pile head reinforcing bar unit capable of constructing a highly reliable structure, having a simple structure, and having excellent productivity.

[0006]

In order to achieve the above object, the present invention has the following arrangement. Claim 1 of the present invention
The lower part of the pile head reinforcing bar unit described in (1) is buried in the foundation of the structure via concrete, and the upper part is formed in a long shape arranged inside the column and the wall of the structure. A pile head reinforcing bar unit, comprising: (a) a plurality of substantially bar-shaped main bars arranged in parallel with each other in a vertical direction; and (b) wound around the main bars buried in the foundation. A spiral hoop muscle whose upper end is bound to the upper part of the main muscle via a tying means and whose lower end is fixed at the lower end side of the main muscle, and (c) the spiral hoop muscle is located near the upper end of the hoop muscle. A kansashi muscle arranged substantially perpendicular to the main muscle, and (d) a substantially bar-shaped kansashi locking muscle arranged parallel to the length direction of the main muscle and having an upper portion fixed to the kansima muscle. It is configured. With this configuration, the following operation is obtained. (1) In particular, at the base of a column or a wall to which a large shearing force is applied, the upper end of the hoop at a position corresponding to this portion is supported by the binding means without being fixed to the main, so that this main is used. The mechanical strength can be maintained without the strength deterioration of the portion. (2) The upper end of the hoop streak is not fixed to the main streak through a welded portion by a welding means, and has a degree of freedom to move with respect to vibration caused by expansion and contraction of the main streak due to a temperature change and filling of ready-mixed concrete. As a result, residual stress and the like are reduced, and the flexibility of the structure is excellent, and the reliability of the structure is excellent. (3) Since it is not necessary to weld and fix all the contact portions between the main bar and the hoop bar using welding means, fine adjustment of the position can be easily performed according to the situation at the site, and the efficiency of construction work can be improved. Can be achieved. (4) Since concrete is poured into the pile head reinforcement unit and hardened, the necessary portions of the pillars and walls of the structure are reinforced using hoop bars.
There is no waste of material, and the durability of the foundation can be effectively improved. (5) Since there is a kansashi bar which projects horizontally at an intermediate position in the length direction of the main bar and is locked at the upper end position of the base portion of the structure, the lower portion of the pile head reinforcing bar unit is connected to the base portion such as a pile. And secures the kansashi streaks to the upper end of the pile to ensure the positioning at the design position, and is excellent in workability and reliability during construction. (6) Since it has kansuji streaks protruding horizontally or left and right, it can be used as a gripping part or a locking part at the time of construction or transportation, and is excellent in handling properties.

Here, the main reinforcing bar is made of a steel material such as SD295A, for example, and a bar-shaped body having a diameter of 10 mm to 30 mm and a length of about 400 mm to 2000 mm, having irregularities formed thereon for preventing concrete from falling off, for example, a deformed shape. Rebar is used. A plurality of the rods, for example, two to
Ten piles are arranged in parallel so as to form a columnar shape at intervals, thereby forming a pile head reinforcing bar unit. The hoop is a reinforcing wire material arranged to spiral around the reinforcing bar, and has a thickness of about 10 m.
For example, a steel or stainless steel having a diameter of 30 to 30 mm, such as a deformed reinforcing bar having irregularities or the like on the surface to enhance the bonding property with concrete to be filled in the periphery is used.
The hoop streak is fixed to the main streak by a welding means such as arc welding or a bundling means using a linear object such as a wire at a predetermined position which is wound around and abuts on the main streak. The upper end of the hoop streak is fixed to the main streak via the binding means without using welding means. If the thickness of the hoop streak is less than 10 mm, the reinforcing effect due to this is small, and if the thickness is more than 30 mm, the rigidity is increased, the construction becomes difficult, and the amount of material used is undesirably increased. The upper end of the hoop stud is supported by welding directly to the upper end of the kansashi anchoring bar, or indirectly fixed via a buckling bar or other anchoring member placed separately from the main bar. Is done.

The kansashi muscles are arranged substantially perpendicular to the main muscles, and can be positioned by locking the horizontally protruding portion to the upper end of the pile.
It is a member that facilitates handling of the pile head reinforcement unit. This kansashi bar is, for example, a rod-shaped body made of steel or the like of the same material as the main bar, and having a length of about 1.1D to 1.5D with respect to a columnar diameter D composed of a plurality of main bars.
The diameter of this rod is 0.1 d to
It is preferable to set the range of d. The kansashi anchoring bar is made of a rod-shaped steel material that is arranged to extend in the length direction of the main bar, and uses a tying unit that binds the kansashi bar with welding means such as arc welding or a metal wire at the upper end side. It is a locking member for supporting the camera. This kansashi retaining bar is set as a plurality of bars and arranged in parallel with each other, one bar-shaped steel material is vertically arranged at the center of the pile head reinforcing bar unit, or one bar-shaped steel material is U-shaped. The left and right portions of the U-shape bent at a right angle may be disposed below the pile head reinforcing bar unit in a state of contacting the main bar.

According to a second aspect of the present invention, in the pile head reinforcement unit according to the first aspect, the kansashi muscle is connected to the main muscle via a binding means, and the kansashi muscle is connected to the kansashi anchoring muscle. It is configured to be connected to the upper end via welding means. With this configuration, the following operation is obtained in addition to the operation of the first aspect. (1) The scorpion muscle is connected to the main muscle via a tying means,
Since the kansashi bar is connected to the upper end of the kansashi locking bar via welding means, excessive stress is not directly applied to the main bar due to vibrations during construction or after construction, and furthermore, during welding, The strength deterioration due to heat can be effectively prevented. (2) Since the kansushi bars are not welded to the main bars, the position of the kansashi bars can be easily adjusted during construction. Here, as the binding means, a metal wire such as stainless steel or steel, or a wire made of synthetic resin or the like can be used.

[0010] The invention described in claim 3 is the invention according to claim 1 or 2.
In the pile head reinforcing bar unit described in the above, the lower part of the kansashi locking bar is connected to a lower end of the hoop bar or a lower end of the main bar. With this configuration, the following operation is obtained in addition to the operation of the first or second aspect. (1) Since the lower part of the Kansashi locking bar is connected to the lower end of the hoop bar or the lower side of the main bar, it is stable without using a locking member such as a horizontal transverse bar disposed horizontally with respect to the main bar. Can fix and hold the kansashi locking bar. (2) The number of parts can be reduced by omitting a dedicated locking member, which is excellent in productivity and economy.

[0011] The invention according to claim 4 is the invention according to claims 1 to 3.
In the pile head reinforcing bar unit according to any one of the above, a hook portion curved in a J-shape is provided at an end of the kansashi locking bar. With this configuration, the following operation is obtained in addition to the operation of any one of the first to third aspects. (1) Since it has a hook portion curved in a J-shape, it is possible to securely and easily arrange the kansashi locking bar on the pile head reinforcing bar unit, which is excellent in workability. (2) By providing the hook portion, it is possible to increase the bonding strength with the hoop reinforce fixed here, to enhance the mechanical strength of the structure, and to improve the structure to which the pile head reinforcement unit is applied. The durability can be further improved.
Here, the hook portion can be formed by mechanically bending the distal end portion of the kansashi locking bar under a predetermined heat-treated and heated condition.

According to a fifth aspect of the present invention, in the pile head reinforcing bar unit according to any one of the first to fourth aspects, a bottom fixing bar for collecting and fixing a lower end portion of the main bar is provided, On the bottom side of the main reinforcement, there is provided a ready-mixed concrete receiving portion formed by expanding the outer periphery formed by the plurality of main reinforcements. With this configuration, claim 1
In addition to the operation of any one of the above items 4 to 4, the following operation is obtained. (1) Since the main reinforcement and the hoop reinforcement can be held in a pre-assembled state by the bottom fixing bar, the assembly at the time of manufacturing the pile head reinforcement unit can be easily performed, the production can be performed with less labor, and the cost can be reduced. Production can be done. (2) By increasing the strength of the pile head reinforcement unit as a structure, the durability can be further improved. (3) Since it has a ready-mixed concrete receiving part formed by enlarging the outer periphery, it is necessary to perform preparatory work during construction, such as pre-filling a filler, etc. in the pile in advance, or excessive filling of ready-mixed concrete. Can be omitted, and a pile head reinforcement unit that reinforces a column or a wall of a structure can be set at low cost. (4) Since the ready-mixed concrete receiving portion can be detachably attached to the lower end of the main bar using a screw portion or the like, it does not become bulky during transportation, and is excellent in handleability and workability. Here, the bottom fixing bar is made of a bar-shaped steel material of the same material as the main bar, and is formed in a V-shape, U-shape, or the like, and the end side is welded and fixed to the lower end of the main bar. The ready-mixed concrete receiving portion is made of steel, stainless steel, or the like, is formed in a tray shape, and is attached to a lower portion of the main bar through a perforated portion such as a screw hole perforated at the center thereof. The ready-mixed concrete receiving portion can be attached directly to the lower portion of the main reinforcement or by welding to a bottom fixing reinforcement supporting the lower end of the main reinforcement.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a plan view showing a pile head reinforcing bar unit of Embodiment 1, and FIG. 2 is a front view of the pile head reinforcing bar unit of Embodiment 1. 1 and 2,
10 is a pile head reinforcement unit in Embodiment 1, 11
Denotes four main bars made of a steel bar, and 12 denotes these main bars.
Hoop bars 13 and 14 wound around the outer periphery of 1 and formed of a bar-shaped steel material in a spiral shape extend in the longitudinal direction of the main bar 11 and are disposed opposite to the left and right sides, and are disposed at the upper and lower ends of the hoop bar 12 Are connected to each other via a welded portion X using welding means, and a pair of kanseki locking bars 15 are
Hook portions formed by bending both upper and lower end portions of the upper and lower portions 3 and 14 into a J-shape, and 16 project horizontally at an intermediate position in the longitudinal direction of the main bar 11 and are fixedly disposed on the upper end portions of the kansashi locking bars 13 and 14. The kansashi bar 17 made of a bar-shaped steel material and locked at the upper end position of the foundation portion of the structure through the tying portion Y by using a tying means is used for joining and welding each lower end side of the main bar 11 by welding. A bottom fixing muscle formed in a substantially inverted conical shape,
18 is a screw engaging portion formed at the bottom of the bottom fixing streak 17,
Reference numeral 19 denotes a tray-like portion which is detachably attached via the screw engaging portion 18 and whose diameter is larger than the outer diameter of the upper portion of the pile head reinforcing bar unit 10 in accordance with the inner diameter of the pile into which the pile head reinforcing bar unit 10 is inserted. It is a ready-mixed concrete receiving part. In addition,
The lower end side of the hoop bar 12 is fixed to the lower portion of the main bar 11 by welding or is supported by being bound to the main bar 11 using a metal wire.

Each of the muscles (the main muscle 11, the hoop muscle 12, the stake anchoring muscle 13, 1
4. Kansashi muscle 16, bottom fixed muscle 17) SD295A
A bar-shaped steel material (deformed rebar) made of such a steel material and having irregularities formed on its surface so that it does not come off when placed in concrete. The ready-mixed concrete receiving portion 19 is formed in a tray shape using a synthetic resin material such as polyethylene, polyimide, and polycarbonate in addition to a metal material such as steel and stainless steel.

Next, a method of manufacturing the pile head reinforcing bar unit 10 will be described. First, for example, four base bars 11 having the same length are arranged at the base ends thereof by bottom fixing bars 17 arranged at the bottom thereof so that the four main bars 11 become the respective sides of the quadrangular prism. Next, the hoop streaks 12 formed in a spiral shape having a predetermined diameter in advance around the quadrangular prism body formed by the main streaks 11.
Place. Further, kanseki retaining bars 13 and 14 for welding and fixing the upper and lower ends of the hoop bars 12 are inserted into the rectangular columnar body, and the upper ends of the kansashi retaining bars 13 are connected to the pile head reinforcing bar unit. 10 is located near the upper end position of the foundation of the structure on which it is installed. After arranging each streak at a predetermined position in this way, the upper end of the hoop streak 12 is fitted to the hook portion 15 of the kanzashi locking streak 13 and fixed using welding means. The lower end of the hoop reinforcing bar 13 is locked to the lower end of the hoop bar 12 and attached to the lower portion of the main bar 11 by a welding unit or a binding unit made of a linear material such as a steel wire. In addition, the kansushi streaks 16 are attached to the upper end of the kansashi engaging streaks 13 by welding means or binding means.
Here, consumable arc welding such as stud welding and metal arc welding, and gas welding such as oxygen acetylene welding and air acetylene welding can be applied to the welding means. Finally, a predetermined portion where the hoop bar 12 and the main bar 11 are in contact with each other is bound with a metal wire such as a wire to assemble the pile head reinforcing bar unit 10 having a moderate flexibility in structure.

A method of reinforcing a column or a wall of a structure by using the pile head reinforcing bar unit 10 of the first embodiment configured as described above will be described. FIG. 3 shows the first embodiment.
FIG. 4 is a partial cross-sectional view showing a state before installation of the pile head reinforcement unit of FIG. 1, and FIG. 4 is a partial cross-sectional view showing a state after the installation. In FIG. 3, reference numeral 19a denotes a ground on which a structure such as a house is disposed, and 19b denotes a cylindrical pile formed of concrete or a metal material which is vertically installed on the ground.
In FIG. 4, reference numeral 19c denotes concrete cast by a formwork arranged at a predetermined interval around the pile head reinforcing bar unit 10. When constructing a pile foundation using the pile head reinforcing bar unit 10, first, as shown in FIG. 3, the kansashi bar 16 is engaged with the upper end of the pile 19b, and the pile 19b is piled.
The pile head reinforcement unit 10 is arranged at a predetermined depth in the inside. Next, a mold (not shown) is arranged at predetermined intervals around the pile head reinforcing bar unit 10, and the ready-mixed concrete is poured into the mold and held and hardened. After the hardening of the ready-mixed concrete, the mold is removed, and as shown in FIG. 4, the pile head reinforcing bar unit 10 is buried in the concrete 19c, and the walls or columns of the reinforced structure are constructed.

The pile head reinforcing bar unit 10 according to the first embodiment has the following operation since it is configured as described above. (A) At the base of a column or a wall to which a large shearing force is applied, the strength of the main bar 11 is prevented from deteriorating due to heat treatment, and a pile head having excellent durability against the shearing force applied to the base is maintained. A reinforcement unit 10 can be provided. (B) All of the contact portions between the main bar 11 and the hoop bar 12 can be erected without being completely fixed, fine adjustment of the position according to the situation at the site can be easily performed, and the efficiency of the construction work can be increased. (C) Since the stake bar 16 is locked at the upper end position of the foundation of the structure, the pile head reinforcement unit is inserted into the foundation such as a pile, and the positioning (depth) at the design position is ensured. The workability and reliability during construction are excellent. (D) Since it has the kansashi streaks 16 protruding horizontally or left and right, it can be used as a gripping part or a locking part at the time of construction or transportation, and is excellent in handling properties. (E) Since the J-shaped hook part 15 is provided, the kansashi locking bars 13 and 14 can be securely and easily attached to the pile head reinforcing bar unit 1.
It can be arranged at 0 and is excellent in workability and durability. (F) Since the bottom fixing bars 17 are provided, the pile head reinforcing bar unit 10 can be easily assembled at the time of manufacturing, can be manufactured with a small amount of labor, and can be produced at low cost. (G) Since it has the ready-mixed concrete receiving portion 19, the construction of the pile head reinforcing bar unit 10 can be performed at a low cost by using a minimum necessary amount of ready-mixed concrete. (H) Since the ready-mixed concrete receiving portion 19 is detachably attached to the lower end portion of the main bar 11 using the screw engaging portion 18, it can be detached at the time of transportation or the like, and is excellent in handleability and workability.

(Embodiment 2) FIG. 5 is a plan view showing a pile head reinforcing bar unit of Embodiment 2, and FIG. 6 is a front view of the pile head reinforcing bar unit of Embodiment 2. 5 and 6, reference numeral 20 denotes a pile head reinforcing bar unit according to the second embodiment, and reference numeral 21 denotes a spiral shape of a bar-shaped steel material such as a deformed reinforcing bar, which is wound around the outer periphery of the main bar 11, and whose lower end is located on the center side. The hoop, 22 which is bent toward and forms a horizontal bent portion 21a, extends in the longitudinal direction of the main bar 11 and is disposed on the center axis portion, and is disposed at the center portion of the kansashi bar 16 and the horizontal bent portion 21a at the lower end of the hoop bar 21. Are kansashi retaining bars that are fixed by welding at the upper and lower portions, respectively. 5 and 6, those having the same functions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The upper end side of the hoop bar 21 is bound to the main bar 11 using a binding unit such as a stainless steel wire or a steel wire without being welded, and is fixed to the kansashi bar 16 via a binding unit or a welding unit as necessary. ing. The middle and lower ends of the hoops 21 are fixed or supported to the main bars 11 by appropriately using welding means or bundling means. The kansashi locking streaks 22 have a J-shaped hook portion 15 at an upper end, which is fitted and welded and fixed to an intermediate portion of the kansashi streaks 16 arranged close to the upper end of the hoop streaks 21, and has a lower end thereof. The side contacts the horizontal bent portion 21a at the lower end of the hoop streak 21, and this contact portion is fixed by welding means or binding means. In addition, the lower end side of the hoop streaks 21 abuts on the main streaks 11 and is fixed by welding means or binding means. Further, a screw portion is formed further below the fixed contact portion on the lower end side of the kansashi engaging streaks 22, so that the ready-mixed concrete receiving portion 19 is attached.

Since the pile head reinforcing bar unit 20 of the second embodiment is configured as described above, it has the following operation in addition to the operation of the pile head reinforcing bar unit of the first embodiment. (A) Since the buckle locking bar 22 is arranged on the central axis of the pile head reinforcing bar unit 20, there is no need to arrange a plurality of buckle locking bars as in the first embodiment, and it is simple and economical. The pile head reinforcement unit 20 can be manufactured. (B) The hoop streaks 16 are fixed to the hoop streaks 21 at the center axis thereof, and the kansashi streaks 16 can be fixed and held in a well-balanced manner. The pile head reinforcement unit 20 can be provided. (C) Since the buckle locking bar 22 is housed at the center position inside the pile head reinforcing bar unit 20, there is no extra protruding portion, handling is easy, and workability is excellent. (D) Since the bottom fixing bars 17 of the first embodiment can be omitted, the number of components in the pile head reinforcing bar unit 20 can be reduced, production can be performed at low cost, and economic efficiency is excellent.

(Embodiment 3) FIG. 7 is a plan view showing a pile head reinforcing bar unit of Embodiment 3, and FIG. 8 is a front view of the pile head reinforcing bar unit of Embodiment 2. 7 and 8, reference numeral 30 denotes a pile head reinforcing bar unit in the third embodiment, 31 denotes a spiral hoop bar formed by winding a bar-shaped steel material around the outer periphery of the main bar 11, and 32 denotes a U-shape as a whole. This is a buckle locking bar that is formed by being bent to be in contact with both sides of the inner circumference of the hoop bar 31 and is fitted and welded to the buckle bar 16 at the upper part. 7 and 8, components having the same functions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The kansashi locking bar 32 is provided at both upper ends thereof with the kansashi bar 16.
And has a J-shaped hook portion 15 which is fitted and welded and fixed to an intermediate portion of the. Also, the middle part and the lower part of the U-shaped kansashi locking bar 32 contact the main bar 11,
This contact portion is fixed by welding means or binding means.
Further, a screw portion is formed at the lower end portion of the U-shaped locking bar 32 formed in a U-shape, and the ready-mixed concrete receiving portion 19 is attached thereto. In addition, kansashi locking bar 3
The main bars 11 can be easily mounted by combining a plurality of the two to form a cage shape as a whole. The upper end side of the hoop streak 31 is bound to the main streak 11 using a binding unit, and the middle and lower end sides thereof are fixed to the main streak 11 by a welding unit or a binding unit. If necessary,
The upper end side of the hoop streaks 31 and the kansashi streaks 16 may be fixed via welding means or binding means.

Since the pile head reinforcing bar unit 30 of the third embodiment is configured as described above, the following functions are provided in addition to the functions of the pile head reinforcing bar units of the first and second embodiments. (A) The Kansashi locking bar 32 can be fixedly held on both sides of the hoop bar 31 of the pile head reinforcing bar unit in a well-balanced manner, and has excellent durability at the base of the column or wall where a large shearing force is applied due to the surrounding arrangement. The pile head reinforcement unit 30 can be provided. (B) It is possible to omit the bottom fixing streaks, and it is economical.
In the case where the whole is formed in a cage shape by combining a plurality of the L-shaped kansashi engaging streaks 32, the main streaks 11 can be easily attached, and the workability is excellent.

[0022]

According to the pile head reinforcing bar unit of the first aspect, the following effects can be obtained. (1) In particular, at the base of a column or a wall to which a large shearing force is applied, the upper end of the hoop at a position corresponding to this portion is supported by the binding means without being fixed to the main, so that this main is used. The mechanical strength can be maintained without the strength deterioration of the portion. (2) Since the upper end of the hoop streak is not fixed to the main streak via a welded portion, the hoop streak has a degree of freedom to move with respect to vibration caused by expansion and contraction of the main streak due to a temperature change and filling of ready-mixed concrete. Residual stress and the like are relieved, and the flexibility of the structure is excellent, and the reliability of the structure is excellent. (3) Since it is not necessary to weld and fix all the contact portions between the main reinforcement and the hoop reinforcement, fine adjustment of the position can be easily performed according to the situation at the site, and the efficiency of the construction work can be improved. (4) Since concrete is poured into the pile head reinforcement unit and hardened, the necessary portions of the pillars and walls of the structure are reinforced using hoop bars.
There is no waste of material, and the durability of the foundation can be effectively improved. (5) Since there is a kansashi bar which projects horizontally at an intermediate position in the length direction of the main bar and is locked at the upper end position of the base portion of the structure, the lower portion of the pile head reinforcing bar unit is connected to the base portion such as a pile. And secures the kansashi streaks to the upper end of the pile to ensure the positioning at the design position, and is excellent in workability and reliability during construction. (6) Since it has kansuji streaks protruding horizontally or left and right, it can be used as a gripping part or a locking part at the time of construction or transportation, and is excellent in handling properties.

According to the invention described in claim 2, according to claim 1
In addition to the effects described above, the following effects can be obtained. (1) The scorpion muscle is connected to the main muscle via a tying means,
Since the kansashi bar is connected to the upper end of the kansashi locking bar via welding means, excessive stress is not directly applied to the main bar due to vibrations during construction or after construction, and furthermore, during welding, The strength deterioration due to heat can be effectively prevented. (2) Since the kansushi bars are not welded to the main bars, the position of the kansashi bars can be easily adjusted during construction.

According to the invention described in claim 3, according to claim 1
The following effects can be obtained in addition to the effects of the second or the second effects. (1) Since the lower part of the Kansashi locking bar is connected to the lower end of the hoop bar or the lower side of the main bar, it is stable without using a locking member such as a horizontal transverse bar disposed horizontally with respect to the main bar. Can fix and hold the kansashi locking bar. (2) The number of parts can be reduced by omitting a dedicated locking member, which is excellent in productivity and economy.

According to the invention of claim 4, according to claim 1,
The following effects can be obtained in addition to the effects of any one of the above items 3 to 3. (1) Since it has a hook portion curved in a J-shape, it is possible to securely and easily arrange the kansashi locking bar on the pile head reinforcing bar unit, which is excellent in workability. (2) By providing the hook portion, it is possible to increase the bonding strength with the hoop reinforce fixed here, to enhance the mechanical strength of the structure, and to improve the structure to which the pile head reinforcement unit is applied. The durability can be further improved.

According to the invention set forth in claim 5, the following effects can be obtained in addition to the effects of any one of claims 1 to 4. (1) Since the main reinforcement and the hoop reinforcement can be held in a pre-assembled state by the bottom fixing bar, the assembly at the time of manufacturing the pile head reinforcement unit can be easily performed, the production can be performed with less labor, and the cost can be reduced. Production can be done. (2) By increasing the strength of the pile head reinforcement unit as a structure, the durability can be further improved. (3) Since it has a ready-mixed concrete receiving part formed by enlarging the outer periphery, it is necessary to perform preparatory work during construction, such as pre-filling a filler, etc. in the pile in advance, or excessive filling of ready-mixed concrete. Can be omitted, and a pile head reinforcement unit that reinforces a column or a wall of a structure can be set at low cost. (4) Since the ready-mixed concrete receiving portion can be detachably attached to the lower end of the main bar using a screw portion or the like, it does not become bulky during transportation, and is excellent in handleability and workability.

[Brief description of the drawings]

FIG. 1 is a plan view of a pile head reinforcing bar unit according to a first embodiment.

FIG. 2 is a front view of a pile head reinforcing bar unit according to the first embodiment.

FIG. 3 is a partial cross-sectional view showing a state before installation of the pile head reinforcing bar unit according to the first embodiment.

FIG. 4 is a partial cross-sectional view showing a state after installation of the pile head reinforcing bar unit according to the first embodiment.

FIG. 5 is a plan view of a pile head reinforcing bar unit according to the second embodiment.

FIG. 6 is a front view of a pile head reinforcing bar unit according to the second embodiment.

FIG. 7 is a plan view of a pile head reinforcing bar unit according to the third embodiment.

FIG. 8 is a front view of a pile head reinforcing bar unit according to the third embodiment.

FIG. 9 is a partial cross-sectional view showing a state before installation of a conventional pile head reinforcement unit.

FIG. 10 is a partial cross-sectional view showing a state after installation of a conventional pile head reinforcement unit.

[Explanation of symbols]

 10 Pile Head Reinforcing Bar Unit of First Embodiment 11 Main Bar 12 Hoop Bar 13 Kansashi Bar 14 Kansaba Bar 15 Hook 16 Kansashi Bar 17 Bottom Fixing Bar 18 Screw Engaging Unit 19 Fresh Concrete Receiving Unit 19a Ground 19b Pile 19c Concrete 20 Pile Head Reinforcement Unit of Embodiment 2 21 Hoop Reinforcement 21a Horizontal Bend 22 Kansashi Reinforcement 30 Pile Head Reinforcement Unit of Third Embodiment 31 Hoop Reinforcement 32 Kansashi Reinforcement 50 Conventional Pile Head Reinforcing bar unit 51 Main bar 52 Hoop bar 53 Fresh concrete receiving part 54 Pile 55 Kansashi bar 56 Concrete X Welded part (welding means) Y Bundled part (bundling means)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D041 AA02 BA05 BA17 BA37 BA56 DB02 DB03 2D046 CA02 CA04

Claims (5)

[Claims] An elongated pile head reinforcing unit having a lower portion embedded in a foundation portion of a structure via concrete and an upper portion disposed inside a column portion or a wall portion of the structure. (A) a plurality of substantially bar-shaped main bars arranged in parallel with each other in the vertical direction; and (b) wound around the main bars buried in the base portion, and an upper end portion thereof is wound. A spiral hoop muscle bound at the upper part of the main muscle through a tying means and having a lower end fixed at the lower end side of the main muscle; and (c) substantially perpendicular to the main muscle near the upper end of the hoop muscle. And (d) a substantially bar-shaped kansashi anchoring muscle arranged parallel to the length direction of the main muscle and having an upper portion fixed to the kansima muscle. Pile head reinforcement unit. 2. The kansashi muscle is connected to the main muscle via a tying means, and the kansashi muscle is connected to an upper end of the kansashi locking muscle via a welding means. The pile head reinforcing bar unit according to 4. 3. The pile head reinforcing bar unit according to claim 1, wherein a lower portion of the buckle bar is connected to a lower end of the hoop bar or a lower end of the main bar. 4. The hook according to claim 1, wherein a hook portion curved in a J-shape is provided at an end of the buckle locking bar. The pile head reinforcement unit as described. 5. A bottom fixing bar for collecting and fixing the lower ends of the main bars, and a ready-mixed concrete receiving portion formed on the bottom side of the main bars by expanding an outer periphery formed by the plurality of main bars. The pile head reinforcing bar unit according to any one of claims 1 to 4, comprising: