JP2936353B2 - Construction method of high strength embedded pile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

THE INVENTION Technical Field] This invention relates to the technical field of construction method of constructing a pile narrowing embedded and, more to a process for construction of the high yield strength buried piles with enhanced tip supporting force.

[0002]

2. Description of the Related Art Conventionally, in the construction of cast-in-place concrete piles and the like, it has been a problem that tip support force is reduced due to loosening of the tip ground due to excavation.
In the construction method described in Japanese Patent No. 2419, a construction method is proposed in which, after the skeleton concrete exhibits strength, a compaction pile is penetrated into the tip ground to compact the tip ground and increase the supporting force.

[0003]

The above-mentioned known construction method has a drawback that the construction period is prolonged only for the curing period of the concrete, because the compacted pile penetrates into the tip ground after the structural concrete has developed its strength. is there. Moreover, to prevent concrete from flowing back into the guide pipe and hardening, the tip of the guide pipe must be sealed tightly with a lid plate that is strong enough to be broken later by compaction piles. Processing of the guide pipe is troublesome and the production cost is high.
In addition, when a hollow guide pipe with a closed end is inserted into a borehole to attempt to sink it, buoyancy due to muddy water acts as resistance.

[0004] In particular, in the case of embedded piles using existing piles,
Since the existing pile pushes muddy water etc. in the borehole like a piston, the water pressure larger than the buoyancy acts as a resisting force, and there is a problem that makes work difficult, which is a problem to be solved .

[0005]

As a means for solving the above problems of the prior art SUMMARY OF THE INVENTION, construction method of high strength buried piles according to the invention described in claim 1, previously in the hollow portion of the ready-made pile
Install a guide pipe with an open end at the end, and
Of the existing pile into the borehole, immediately after the installation of the existing pile
Through the guide pipe and penetrate the compacted pile
After that, fill the mortar inside the hollow part of the existing pile.
Smell of embedded piles to fill and fix compacted piles
If the inner diameter of the existing pile is slightly larger than the outer diameter of the compacted pile,
If the inner diameter of the guide pipe is compacted, it is almost the same as the outer diameter of the pile.
The upper part of the guide pipe into an inverted cone-shaped guiding part.
And forming the guide part in contact with the inner surface of the hollow part
It is characterized by arrangement.

A high-load bearing pile according to the second aspect of the present invention.
The construction method is to open the tip at the tip inside the hollow part of the existing pile.
An open guide pipe is installed, and the existing pile is drilled
The guide pie immediately after the existing pile is installed.
The compacted pile penetrates into the tip ground through
Compacting pile by filling hollow mortar etc. in the hollow part of the pile
In construction methods of the embedded pile for securing the inner diameter of the ready-made pile
Is significantly larger than the outer diameter of the compacted pile,
Guide pipe with the same inside diameter as the outside diameter
Multiple guide pipes are arranged in parallel in the plane, and each guide pipe is
It is characterized by being integrated with the existing pile.

[0007] The invention according to claim 3 is the invention according to claim 1 or 2.
In the construction method for embedded piles with high strength described,
If a stake is formed just below the tip of the pile,
Id pipes serve as a guide from the tip of the pre-built pile to the root consolidation part
It is characterized by being protruded by the length.

[0008]

Te construction smell of the action] narrowing embedded pile, the tip portion of the ready-made pile 14 is opened, the embedding can be performed in a state in which less susceptible to resistance due to muddy water. In addition, the existing pile 14
Penetrate the compacted pile 6 into the tip ground 5 through the
Mud into the existing pile 14 and guide pipe 4 '.
The compacted pile 6 does not interfere with the tip ground 5 even if the water is flowing back a little.
And the tip ground 5 can be compacted.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG .
1A and 1B show an existing concrete pile 14 used for construction of a high-bearing embedded pile. These use the hollow portion 14a of the existing concrete pile 14 as a guide pipe for the compacted pile 6, and use the hollow portion 1a of the existing concrete pile 14 as a guide pipe.
A short guide pipe 4 ′ is installed concentrically at the lower end inside 4 a of the compacted pile 6. The opening at the tip of the guide pipe 4 'remains open. The upper end of the guide pipe 4 'is formed in an inverted conical guiding portion 4a, and is in contact with the inner surface of the hollow portion 14a. Therefore, the compacted pile 6 inserted into the hollow portion 14a of the existing concrete pile 14 is always positioned at the center of the pile. Immediately after the existing concrete pile 14 is buried in the excavation hole, the compacted pile 6 penetrates into the tip ground 5. Thereafter, the hollow portion 14a is filled with the filling mortar to fix the compaction pile 6 (the invention of claim 1) .

[0010]

[Second Embodiment] FIG. 2 is a construction diagram in the case where a burring portion 7 is formed immediately below the tip of an embedded pile. Guide pipe 4 '
Is protruded from the tip (lower end) of the existing pile 14 by an appropriate length, and is configured to serve as a guide in the rooting portion 7 (the invention of claim 3) .

[0011]

[Third Embodiment] FIG. 3 shows a case in which a stake is formed immediately below the tip of an embedded pile.
4 shows an embodiment in which the inner diameter of 4 is several times larger than the outer diameter of the compaction pile 6. Three (but not limited to) guide pipes 4 ′ having an inner diameter substantially equal to the outer diameter of the compaction pile 6 are equally arranged in a cross section of the large-diameter hollow portion 14 a and arranged in parallel. It is integrated with the existing pile 14 by two connecting plates 8a and 8b. The upper end of the guide pipe 4 ′ is formed as an inverted conical guide part 4 a for introducing the compaction pile 6, and the upper connecting plate 8 a is installed at the upper end thereof ( not shown ).
The invention of claim 2) .

The penetration of the compaction pile 6 is performed, for example, by
Insert the rotating shaft from the upper end of the
Insert the square hole at the tip of the rotating shaft into the square shaft and rotate with the rotating machine.
The method of screwing into the tip ground 5 is preferable. To the tip ground 5
Compaction pile 6 which has been penetrated, the charge in the guide pipe 4 after its
It is firmly fixed by the filled filling mortar.

[0013]

According to the method for constructing a high-bearing embedded pile according to the first to third aspects of the present invention, the compacted pile can be quickly penetrated, and the work can be performed with high efficiency in a short construction period. Since the compacted pile is firmly penetrated into the ground at the tip and has a large compaction effect at the ground at the tip, it is possible to provide a high-bearing embedded pile with a large bearing capacity at the tip, and to provide a structure with high workability, quality, and reliability. It contributes to construction.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views showing an enlarged structure of a guide pipe at a lower portion of an existing pile.

FIG. 2 is a cross-sectional view showing a state in which a compaction pile in an embedded pile in which a root compaction portion is formed penetrates into a tip ground.

FIG. 3 is a sectional view of a large-diameter precast concrete pile.

[Explanation of Signs] 4 ' Guide Pipe 5 Tip Ground (Support Layer) 6 Compacted Pile 14 Existing Pile 14a Hollow Section

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomio Tsuchiya 2-5-1 Minamisuna, Koto-ku, Tokyo Inside the Technical Research Center, Takenaka Corporation (72) Inventor Yoshihiko Kurita 2-5-1 Minamisuna, Koto-ku, Tokyo No. Takenaka Corporation Technical Research Institute Co., Ltd. (72) Inventor Takuhei Fukuhara 8-21-1, Ginza, Chuo-ku, Tokyo Co., Ltd. Takenaka Civil Engineering Co., Ltd. (56) References JP-A-63-312419 (JP, A) No. 55-50132 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 5/34 E02D 3/08 E02D 5/54 E02D 5/62

Claims (3)

(57) [Claims] (1) A tip opening is formed at a tip portion in a hollow portion of the existing pile.
Install the released guide pipe and insert the existing pile into the borehole
And the guide pipe immediately after the existing pile is built
Through the compaction pile into the ground at the tip, and then
Filling the hollow part of the pile with filling mortar etc.
If the inner diameter of the existing pile is slightly larger than the outer diameter of the compacted pile in the method of mounting the embedded pile to be fixed, the inner diameter of the guide pipe is made approximately the same as the outer diameter of the compacted pile, and the upper part of the guide pipe is inverted. A method for constructing a high- bearing embedded pile , characterized in that the guide part is formed in a conical guiding part, and the guiding part is brought into contact with the inner surface of the hollow part of the existing pile to be concentrically arranged. 2. A tip end opening is formed at a tip end in the hollow portion of the existing pile.
Install the released guide pipe and insert the existing pile into the borehole
And the guide pipe immediately after the existing pile is built
Through the compaction pile into the ground at the tip, and then
Filling the hollow part of the pile with filling mortar etc.
When the inside diameter of the existing pile is much larger than the outside diameter of the compacted pile in the construction method of the embedded pile to be fixed, a guide pipe with the same inside diameter as the outside diameter of the compacted pile is installed inside the hollow section of the existing pile. a plurality of arranged in parallel, each of the guide pipes is characterized that you integrated with ready-made pile by connecting plate, the construction method of the high strength embedded pile. 3. The method according to claim 1, wherein when the pile is formed directly below the tip of the embedded pile, the guide pipe of the pile is protruded from the tip of the pile by a length serving as a guide in the pile. The method for constructing a high-bearing embedded pile according to claim 1 or 2 .