JP2001040677A - Pile head end structure by envelope type base plate, and work method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly envelope steel bars which are to be connected around the periphery of a pile head portion of an existing pile wound by a steel pipe, and then install a base plate mechanically jointed to the outer portion in the pile. SOLUTION: An envelope type base plate 1 to be installed on the outer portion of the pile has an outer diameter 6 quickly connecting and enveloping steel bars 5 to the outer perimeter of the pile head portion and a ring shape having an inner diameter 8 almost equal to the outer diameter 7 of pile and is provided with a steel bar penetrating hole 9 on the perimeter. The steel bar 5 connected to the outer periphery of the steel bar is inserted to the penetrating hole 9 of the base plate 1, then a nut 11 screwed to the male screw portion 10 is tightened and by mechanically jointing the base plate 1 to a joint fitting 12 for connecting the steel bar, a base plate 1 enveloping the steel bar 5 and being united with the steel bar 5 is installed at the outer portion of the pile.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile head end structure using an envelope type base plate and a method of constructing the same.

[0002]

2. Description of the Related Art A conventional pile head end structure of a steel pipe wound prefabricated pile has a structure in which, when a prefabricated pile is connected to a foundation slab, there is no base plate enveloping a rebar connected to an outer periphery of the pile head. Are not integrated to form a composite structure. .

[0003]

However, the conventional technique has the following problems.

[0004] A pile head joint between a steel pipe wound prefabricated pile and a foundation slab is evaluated as a reinforced concrete column in which a reinforcing bar connected to a pile head is disposed in a concrete column having a base plate shape. Perform strength calculation and design, but without placing a base plate that encloses the reinforcing bar,
Since the composite structure is not formed only by connecting the reinforcing bar to the periphery of the pile head, this evaluation cannot be performed, and the usual calculation and design of strength cannot be performed.

Since the concrete strength of the foundation slab is smaller than that of the steel pipe wound precast pile, it is necessary to distribute the acting force from the pile to the base slab by dispersing it on the base plate.
Since there is no base plate for enclosing the reinforcing bar around the pile head, the number of reinforcing bars to compensate for this is significantly increased, and the material cost and the installation cost are increased.

[0006] With the increase in the number of pile head joint reinforcing bars to be attached, it becomes difficult to construct the base bars of the foundation and the reinforcing bars of the foundation beams, which takes time and effort.

[0007] Usually, the base plate is welded to the pile before the pile is installed, and the base plate having a shape that continuously wraps the reinforcing steel at the periphery of the pile can be attached because it hinders the manufacture of the pile and the construction of the pile. Absent.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by developing a pile head end structure using an envelope type base plate and a construction method thereof.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pile head end structure using an envelope type base plate according to the present invention and a construction method thereof will be described with reference to the drawings.

FIG. 1 is a plan view showing a state in which an envelope type base plate 1 according to the first and fourth aspects of the present invention is installed outside the pile of a steel pipe wound prefabricated pile 2. The envelope-type base plate 1 outside the pile has an outer diameter 6 that continuously envelops the reinforcing bar 5 connected to the outer periphery of the pile head, and an inner diameter 8 that is substantially equal to the pile outer diameter 7.
And a reinforcing-bar through-hole 9 is provided on the circumference. The rebar 5 connected to the outer periphery is inserted into the rebar through hole 9 of the base plate 1, and the nut 11 screwed to the male thread portion 10 of the rebar 5 is tightened, so that the base plate 1 is connected to the rebar connection joint fitting 12 and the machine. The base plate 1 that encloses the reinforcing bar 5 and is integrated with the reinforcing bar 5 by being joined together is installed outside the pile. The base plate 1 forms a composite structure with the reinforcing bar 5 connected to the outer periphery of the pile head, and the compressive force acting from the steel pipe wound ready-made pile 2 is transmitted by dispersing the base plate 1 and the end plate 4 to the base slab, and the tensile force. The rebar 5 transmits to the foundation slab. Base plate 1
Shows an example in which the rising portion 15 is formed in the outer peripheral portion by bending the angle 14 into an annular shape, but it may be manufactured by bending a flat steel or the like with a rib or the like.

FIG. 2 is a longitudinal sectional view taken along the line AA of FIG.

FIG. 3 is a plan view showing a state in which the enveloping base plate 1 according to the second and fourth aspects of the present invention is installed outside the pile of the steel pipe wound prefabricated pile 2. The envelope-type base plate 1 outside the pile has an annular shape having an outer diameter 6 and an inner diameter 8 substantially equal to the pile outer diameter 7 that continuously envelop the reinforcing bars 5 connected to the outer periphery of the pile head, and has a circumference. A reinforcing bar through hole 9 is provided on the upper side. The rebar 5 connected to the outer periphery is inserted into the rebar through hole 9 of the base plate 1, and the nut 11 screwed to the male thread portion 10 of the rebar 5 is tightened, so that the base plate 1 is connected to the rebar connection joint fitting 12 and the machine. The base plate 1 that encloses the reinforcing bar 5 and is integrated with the reinforcing bar 5 by being joined together is installed outside the pile. The base plate 1 forms a composite structure with the reinforcing bar 16 connected to the pile head end plate 4 and the reinforcing bar 5 connected to the outer periphery of the pile head, and the compressive force acting from the steel pipe wound ready-made pile 2 is applied to the base plate 1 and the end plate 4. Are transmitted to the foundation slab in a dispersed manner, and the tensile force is transmitted to the foundation slab by the pile head end plate reinforcing bar 16 and the pile head outer peripheral reinforcing bar 5. The base plate 1 shows an example in which the angle 14 is bent into an annular shape to form a rising portion 15 on the outer peripheral portion.
There is also a case where a rib or the like is attached to a product obtained by bending a flat steel or the like. Although the reinforcing bar 16 connected to the pile head end plate 4 is fixed by the nut 11, the reinforcing bar may be welded to the end plate 4 in some cases.

FIG. 4 is a longitudinal sectional view taken along the line AA of FIG.

FIG. 5 is a plan view showing a state in which the enveloping base plate 1 according to the third and fourth aspects of the present invention is installed inside and outside the pile of the steel pipe wound ready-made pile 2. The base plate 1 installed inside and outside the pile has an annular shape having an outer diameter 6 that continuously envelops the reinforcing bar 5 connected to the outer periphery of the pile head and an inner diameter 8 substantially equal to the inner diameter 17 of the pile. The reinforcing bar through-holes 9 are provided on the circumference in a double manner. A nut 11 is inserted into the through hole 9 of the base plate 1 with the reinforcing bar 5 connected to the outer periphery and the reinforcing bar 16 connected to the end plate 4 of the pile head, and screwed to the male screw portion 10 of the reinforcing bar 5 and the reinforcing bar 16. By tightening the base plate 1 and mechanically joining the base plate 1 with the joint fitting 12 for reinforcing bars and the end plate 4, the reinforcing bars 5 and the reinforcing bars 16 are formed.
Is placed inside and outside the pile.
The base plate 1 forms a composite structure with the rebar 5 and the rebar 16, and the compressive force applied from the steel pipe wound ready-made pile 2 is transmitted by dispersing the base plate 1 to the base slab, and the tensile force is transmitted by the rebar 5 and the rebar 16. To communicate. The base plate 1 shows an example in which the rising portion 15 is formed on the outer peripheral portion by bending the angle 14 into an annular shape. However, the base plate 1 may be manufactured by bending a flat steel or the like with a rib or the like.

FIG. 6 is a longitudinal sectional view taken along the line AA of FIG.

[0016]

The pile head end structure using the envelope type base plate according to the present invention and the construction method thereof have the following specific effects.

The joint of the pile head between the steel pipe wound ready-made pile and the foundation slab has a strength evaluated as a reinforced concrete column by forming a composite structure of a reinforcing bar connected to the pile head and a base plate that continuously encloses the reinforcing bar. Calculation and design are possible.

Since a pile head joint having high structural rationality and capable of transmitting the acting force from the pile to the base slab by dispersing the force on the base plate can be constructed, the rebar connected to the pile head can be reduced by half, and the cost can be significantly reduced. Can be

In addition to the reduction in the number of pile head joint reinforcing bars to be installed, the overcrowding of the reinforcing bars is avoided, so that the foundation bars of the foundation and the reinforcing bars of the foundation beams are smoothed, and the construction period is greatly shortened.

The envelope base plate can be easily installed outside the pile and inside and outside the pile after the pile is constructed by mechanical bonding, so that the base plate is not restricted by the pile production and the pile construction method.
It is possible to freely adopt a structurally necessary shape.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment in which an envelope-type base plate according to the first and fourth aspects of the present invention is installed outside a pile.

FIG. 2 is a longitudinal sectional view taken along line AA of FIG.

FIG. 3 is a plan view of an embodiment in which an envelope type base plate according to the second and fourth aspects of the present invention is installed outside a pile.

FIG. 4 is a longitudinal sectional view taken along line AA of FIG. 3;

FIG. 5 is a plan view of an embodiment in which the envelope type base plate according to the third and fourth aspects of the present invention is installed inside and outside the pile.

FIG. 6 is a longitudinal sectional view taken along line AA of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Envelope type base plate 2 Precast pile wound with steel pipe 3 Steel pipe 4 End plate of pile head 5 Reinforcement connected to the periphery of pile head 6 Outer diameter of base plate 7 Pile outer diameter 8 Inner diameter of base plate 9 Reinforcement through hole arranged in base plate 10 Male thread portion of reinforcing bar 11 Nut 12 Reinforcing bar connection fitting 13 Welding portion of rebar connection fitting and steel pipe 14 Angle 15 Outer peripheral rising portion of base plate 16 Reinforcing bar connected to end plate 17 Pile inner diameter

Claims (4)

[Claims] 1. An annular shape having an outer diameter continuously enveloping a reinforcing bar connected to an outer periphery of a pile head of a steel pipe wound prefabricated pile and an inner diameter substantially equal to an outer diameter of the pile, and having a circular shape. Using a base plate having a reinforcing-bar through hole inserted therein, a reinforcing bar connected to the outer periphery is inserted into the reinforcing-bar through-hole of this base plate, and a nut screwed into a male thread portion of the reinforcing bar is tightened, thereby forming a reinforcing-bar joint fitting. By installing a base plate mechanically bonded to the outside of the pile, the outer periphery of the pile head that joins the steel pipe wound prefabricated pile and the foundation slab and the base plate that surrounds the outer periphery of the pile head form a composite structure. Pile end structure with envelope base plate characterized by 2. An annular shape having an outer diameter continuously enveloping a reinforcing bar connected to an outer periphery of a pile head of a steel pipe wound prefabricated pile and an inner diameter substantially equal to an outer diameter of the pile, and having a circular shape. Using a base plate having a reinforcing-bar through hole inserted therein, a reinforcing bar connected to the outer periphery is inserted into the reinforcing-bar through-hole of this base plate, and a nut screwed into a male thread portion of the reinforcing bar is tightened, thereby forming a reinforcing-bar joint fitting. By installing a base plate that is mechanically joined to the outside of the pile, the reinforcement connected to the pile head end plate that joins the steel pipe wound ready pile and the foundation slab, the outer periphery of the pile head, and the outer reinforcement of the pile head Pile head end structure with envelope base plate, characterized in that the envelope base plate forms a composite structure 3. An annular shape having an outer diameter continuously enclosing a reinforcing bar connected to an outer periphery of a pile head of a steel pipe wound ready-made pile and an inner diameter substantially equal to an inner diameter of the pile, and on the circumference thereof. Using a base plate in which a reinforcing bar through hole is arranged, insert a reinforcing bar connected to the outer periphery and a reinforcing bar connected to the end plate into the reinforcing bar through hole of this base plate, and tighten a nut screwed into a male screw portion of the reinforcing bar. By installing a base plate that is mechanically connected to the joint metal fittings and end plates for reinforcing bars inside and outside the pile, the outer periphery of the pile head and the end plate of the pile head that join the steel pipe wound ready-made pile and the foundation slab A pile head end structure using an envelope-type base plate, wherein a base plate enclosing a reinforcing bar, a pile head outer peripheral bar, and a pile head end plate reinforcing bar forms a composite structure. 4. An annular shape having an outer diameter continuously enveloping a reinforcing bar connected to an outer periphery of a pile head of a steel pipe wound ready-made pile,
In addition, a base plate having reinforcing bar through holes arranged on its circumference is used, and a reinforcing bar connected to the outer circumference or a reinforcing bar connected to the outer circumference and a reinforcing bar connected to the end plate are inserted into the reinforcing bar through holes of the base plate. And, by tightening the nut screwed to the male screw part of the reinforcing bar, and joining this base plate to the reinforcing metal connection fitting or the reinforcing metal connection fitting and the end plate, the reinforcing steel connected to the outer periphery of the steel pipe wound ready-made pile or A pile head with an enveloping base plate, characterized in that the reinforcing plate connected to the outer periphery and the reinforcing bar connected to the end plate are enveloped, and the base plate integrated with the reinforcing bar is mechanically installed outside the pile or inside and outside the pile. Construction method of end structure