JP2003129471A - Method of reinforcing of foot protection pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of cracks and subsequent breakage of a foot protection part in which an expanded foot protection part is provided at an end portion of a conventional pile by using a foot protection liquid such as cement milk. SOLUTION: Projection and recess portions 4 are formed on either one of outer or inner periphery, or both peripheries of the conventional pile. A foot protection part 2 and an end portion 3a of a conventional pile 3 are joined firmly to each other via the projection and recess portions 4, whereby breakage caused by punching shear may be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rooting pile in which a rooting block (also referred to as rooting bulb) is integrally provided at the tip of the pile when the pre-boring method or the medium excavation method is carried out. Reinforcement method, in particular, a method for reinforcing a pile to prevent the occurrence of punching shear failure by fixing the pile and the consolidation block integrally by providing unevenness at the tip of the pile to prevent the pile from breaking by shearing. It is about.

[0002]

2. Description of the Related Art Conventional consolidation of piles is carried out, for example, as shown in FIG. 9, after filling a consolidation solution 51 such as cement milk into a hole (not shown) drilled in the ground, the ready-made pile is prepared. In the root consolidation structure 53 configured by inserting 52, the root consolidation solution 51 having a compressive strength of 200 kg / cm ² or more is used to enhance the tip supporting force.

However, the strength of the root-setting structure 53 as described above is not determined only by the compressive strength of the root-setting liquid 51, and the cracking phenomenon shown by the dotted line and arrow in FIG. It is considered that this is caused by punching shear failure in the solidified part.

Conventionally, for example, as disclosed in Japanese Patent Laid-Open No. 7-76830, a ring larger than the outer diameter of the pile is previously provided in the soil cement below the pile to be inserted in order to enhance the supporting force of the pile. A method has been developed to reinforce the bearing capacity of a rooting pile by arranging a disc and a spiral spring.

[0005]

However, in the technique disclosed in the above-mentioned Japanese Patent Laid-Open No. 7-76830, a ring, a disk or the like having a diameter larger than the outer diameter of the pile is installed in the soil cement below the pile. Therefore, it is possible to reinforce the bearing capacity to some extent, but when a large force is applied to the pile in the vertical direction or the circumferential direction, punch-out shear failure occurs in the root consolidation part formed by the root consolidation solution. However, this has caused a problem that cracks occur in the root consolidation portion and the bearing capacity of the pile is significantly weakened.

A method of reinforcing a pile for piling according to the present invention is a completely new invention developed in view of the above-mentioned conventional problems, and in particular, unevenness is formed at the tip of the pile to be inserted into the piling solution. By installing the pile, it strengthens the connection between the pile tip and the root consolidation part, which increases the peripheral frictional force between the pile and the root consolidation part, and reduces the force transmitted to the root consolidation part of the pile tip. Further, there is provided a completely new invention in which the tip portion is further reinforced so that the shearing force of the tip portion is strengthened and the region where the tip is broken is restrained to prevent the punching shear fracture of the root consolidation portion. It is a thing.

[0007]

A method of reinforcing a pile for consolidation according to the present invention is an invention which has been fundamentally improved from the above-mentioned conventional problems. The gist of the first invention is to drill a hole in the ground. In a method for constructing a support foundation by inserting a ready-made pile after filling a cement hardening solution such as cement milk into the formed hole, the method is inserted into the consolidation solution. It is a method of reinforcing a root-consolidated pile, characterized by constructing unevenness in advance on the outer circumference, the inner circumference, or both of the tip of a ready-made pile.

According to the first aspect of the present invention, since the unevenness is provided on the outer circumference and / or the inner circumference of the tip portion of the ready-made pile to be inserted into the root hardening liquid such as cement milk, the root hardening is performed. It is possible to firmly bond the root consolidation portion formed by the liquid and the tip portion of the ready-made pile by the effect of the unevenness. Therefore, this increases the peripheral frictional force between the pile and the root consolidation part, reduces the force transmitted to the root consolidation part at the pile tip, and strengthens the shearing force at the tip of the pile and restrains the area where the tip breaks. It is possible to prevent the punching shear fracture of the root consolidation part.

The gist of the second invention of the method for reinforcing a soil-consolidating pile according to the present invention is to construct by constructing a window through which a soil-comprising fluid can flow in advance at the tip of the ready-made pile provided with the unevenness. Is a method for reinforcing a rooting pile according to the first invention.

According to the second aspect of the present invention, since a window through which the rooting liquid can flow is previously formed at the tip of the prefabricated pile provided with the uneven surface, it is formed by the rooting liquid. The pile and the root consolidation portion can be integrated by firmly joining the root consolidation portion and the tip portion of the pile by the double action of the unevenness provided on the tip portion and the window. Therefore, by this, the shearing force of the tip portion of the pile is strengthened and the region where the tip is broken can be restrained, and the punching shear breaking force of the root consolidation portion can be prevented from being generated.

The gist of the third invention of the method of reinforcing a pile for consolidation according to the present invention is to reinforce a member such as a steel pipe with a window or a reinforcing bar cage, which is separately formed at the tip edge of the tip of the ready-made pile provided with the unevenness. The first that is characterized by the fact that the
It is a method of reinforcing a rooting pile of the invention.

In the third aspect of the invention, since the reinforcing member such as a steel pipe with a window and a reinforcing bar cage which is separately formed is integrally attached to the tip edge of the tip portion of the ready-made pile provided with the unevenness, the construction is carried out. A root-hardening portion formed by the root-hardening solution,
By the double action of the unevenness of the tip portion of the pile and the reinforcing member, the pile and the root consolidation portion can be integrated by firmly connecting them. Therefore, by this, it is possible to increase the shearing force at the tip of the pile and restrain the region where the tip breaks, thereby preventing the punching shear breaking force of the root consolidation part from being generated.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the method of reinforcing a pile for piling according to the present invention will be described. FIG. 1 is a simplified explanatory view of the essential parts of a first embodiment of the reinforcing method of the present invention. (a),
(b), (c) is a partially cutaway vertical cross-sectional explanatory view of the tip portion of the pile used in the present invention, and FIG. 3 is an explanatory diagram for explaining the function and effect of the first embodiment of the present invention. is there.

4 (a) and 4 (b) are partially cutaway vertical sectional explanatory views of the second embodiment of the present invention, FIG. 5 is an explanatory view of the third embodiment of the present invention, and FIG. 6 is the present invention. Explanatory drawing of 4th Example, FIG. 7 is explanatory drawing for demonstrating the effect of 2nd Example-4th Example of this invention, FIG.8 (a), (b) is 5th Example of this invention. It is explanatory drawing of an example and 6th Example.

In FIG. 1, reference numeral 1 denotes a reinforcement structure for a soil consolidation pile, which is constructed by applying a first embodiment of the method for reinforcing a soil consolidation pile according to the present invention. Reference numeral 2 denotes a root-hardening portion, which is a block in which a root-hardening liquid such as cement milk is filled and solidified in a hole (not shown) formed in the ground.

Reference numeral 3 is a ready-made pile, and a large number of irregularities 4 are provided on the outer circumference and the inner circumference of the tip portion 3a of the ready-made pile 3. The tip portion 3a of the ready-made pile 3 is inserted into the root consolidation portion 2 and is integrally connected thereto. Reference numeral 5 denotes an end plate attached to the tip edge of the ready-made pile 3.

The method of the first embodiment of the present invention will be described in order of steps. In the first embodiment, as shown in FIG. 1, a drilling hole (not shown) for burying the ready-made pile 3 in the ground.
Is drilled with a predetermined outer diameter and depth, and a rooting liquid such as cement milk is filled in the drilled holes.

Next, while inserting the ready-made pile 3 having the projections and depressions 4 on the tip portion 3a into the drilling hole, the tip portion 3a is deeply inserted into the rooting solution, and the rooting solution is solidified in this state. A block-shaped root consolidation portion 2 is formed.

Therefore, since the unevenness 4 is provided on the outer circumference and the inner circumference of the tip portion 3a of the ready-made pile 3, the tip portion 3 of the ready-made pile 3 is formed.
The a and the root-hardening portion 2 can be integrally connected to each other through the unevenness 4.

The above-mentioned ready-made pile 3 is shown in FIGS. 2 (a), 2 (b) and 2 (c).
As illustrated in FIG. 2, when providing the unevenness 4 on the tip 3a of the ready-made pile 3, the unevenness 4 may be provided only on the outer circumference of the tip 3a, or the unevenness 4 may be provided only on the inner circumference of the tip 3a. Also, or unevenness 4 on both the outer and inner circumferences of the tip 3a.
Both can be provided. However, as shown in FIGS. 1 and 2 (c), it is more effective to provide the unevenness 4 on both the outer circumference and the inner circumference of the tip 3a.

In the first embodiment, as described above, the unevenness 4 is provided on the tip portion 3a of the ready-made pile 3, and the tip portion 3a is inserted into the root fixing portion 2 to integrally integrate the two. Since it is configured to be coupled, as shown in FIG. 3, even when an external force such as that shown in FIG. 3 is applied to the prefabricated pile 3 due to an earthquake or the like, the tip portion 3a of the prefabricated pile 3 is consolidated through the unevenness 4 Part 2
Since they are firmly connected to each other, the prefabricated pile 3 and the root consolidation portion 2 can mutually increase the peripheral frictional force.

Therefore, the force transmitted to the tip portion 3a of the ready-made pile 3 and the root consolidation portion 2 can be reduced, the shearing force of the tip portion 3a of the ready-made pile 3 is strengthened, and the area where the tip is destroyed is restricted. As a result, it is possible to prevent the punch-out shear failure of the root consolidation portion 2.

In the first embodiment, the embodiment in which the unevenness 4 is provided on the outer circumference or the inner circumference of the tip portion 3a of the prefabricated pile 3 has been described, but it is shown in FIGS. 4 (a) and 4 (b). As shown in the second embodiment, a plurality of windows 6 can be formed in the wall surface of the tip portion 3a provided with the unevenness 4 of the above-mentioned ready-made pile 3 to allow the rooting liquid to flow therein. In this case, since a part of the root consolidation part 2 is inserted into the window 6, the root consolidation part 2 and the ready-made pile 3 can be more firmly and integrally connected.

In the case of the second embodiment, the case where the plurality of windows 6 are bored in the tip portion 3a of the prefabricated pile 3 has been described, but as shown in the third embodiment shown in FIG. It is also possible to perform the construction using the ready-made piles 3 with steel pipes in which the steel pipes 7 and 8 in which a plurality of windows 6 are preliminarily drilled are integrally attached and fixed to the end plate 5 at the tip of the ready-made piles 3. The difference between the steel pipe 7 and the steel pipe 8 is whether or not a punching piece 9 is provided on the side edge of the window 6. The steel pipe 8 provided with the punched piece 9 is more effective because it is more firmly connected to the root consolidation portion 2.

In the third embodiment, the embodiment in which the steel pipes 7 and 8 having the window 6 are used has been described.
As shown in the fourth embodiment of (a) and (b), instead of the steel pipes 7 and 8, rebar cages 10 and 11 are attached to the end plate 5 at the tip of the ready-made pile 3.
It is also possible to carry out construction using the ready-made piles 3 with steel pipes that are integrally attached and fixed to.

The rebar cage 10 has a general structure, but the rebar cage 11 is constructed by winding a spiral rebar 11b around two steel rods 11a. These rebar cages 10 and 11 merely exemplify some of the rebar cages, and other rebar cages having various structures can be similarly used.

When the method shown in the second embodiment of FIG. 4 to the fourth embodiment of FIG. 6 is carried out, as shown in FIG. 7, the unevenness 4 formed on the tip 3a of the ready-made pile 3 is formed. In addition, the window 6 of the tip portion 3a of the ready-made pile 3 or the steel pipes 7 and 8 provided with the window 6 or the rebar cages 10 and 11 are deeply meshed with a part of the root consolidation portion 2 and are coupled to each other. Therefore, the shearing force between the ready-made pile 3 and the root consolidation portion 2 can be increased to restrain the region where the tip is broken, and thus the punching shear fracture of the root consolidation portion 2 can be prevented.

Therefore, it is possible to enhance the shearing force between the tip portion of the ready-made pile 3 and the root consolidation portion 2 to restrain the region where the tip is broken, and thereby the punching shear fracture of the root consolidation portion 2 occurs. Can be prevented. In addition to the above embodiment, FIG.
As in the fifth embodiment shown in (a), the tip portion 3a of the ready-made pile 3
A plurality of ring grooves 12 of about 1 cm are provided on the outer peripheral surface of
Alternatively, as shown in the sixth embodiment of FIG. 9B, the tip portion 3a is
It is also possible to weld a plurality of round steels and deformed rebars on the outer circumference of the above and form a plurality of convex rings 13 to form the unevenness 4 on the outer circumference of the tip portion 3a.

[0029]

According to the present invention, since unevenness is provided on the outer circumference and / or the inner circumference of the tip portion of the ready-made pile to be inserted into the rooting liquid such as cement milk, the rooting is carried out. There is an effect that the root consolidation portion formed by the liquid and the tip portion of the ready-made pile can be firmly bonded by the action of the unevenness. Therefore, this increases the peripheral frictional force between the pile and the consolidation section, reduces the force transmitted to the consolidation section at the pile tip, strengthens the shearing force at the pile tip, and restrains the area where the tip breaks. It also has the effect of preventing the occurrence of punching shear failure of the root consolidation part.

In addition, when a window through which rooting solution can flow is previously formed in the tip of the ready-made pile provided with the uneven surface, the rooting section formed by the rooting solution and 2 with unevenness provided on the tip of the pile and the window and
It has an effect that it can be firmly connected by a heavy action to integrate the pile and the root consolidation part. Therefore, this has the effect of increasing the shearing force at the tip of the pile and restricting the region where the tip breaks, thereby preventing the generation of the punching shear breaking force at the root consolidation part.

Further, when a separately formed reinforcing member such as a steel pipe with a window and a reinforcing bar cage is integrally attached to the tip edge of the tip portion of the ready-made pile provided with the unevenness, and the construction is carried out, the rooting liquid is used. It has an effect that the pile and the root consolidation portion can be integrated by firmly connecting them by the double action of the formed root consolidation portion, the unevenness of the tip of the pile and the reinforcing member. Therefore, this has the effect of increasing the shearing force at the tip of the pile and restricting the region where the tip breaks, thus preventing the generation of the punching shear breaking force at the root consolidation part.

[Brief description of drawings]

FIG. 1 is a simplified explanatory view of a main part of a first embodiment of a reinforcing method of the present invention.

FIG. 2 (a), (b), (c) is a partially cutaway vertical cross-sectional explanatory view of a tip portion of a pile used in the present invention.

FIG. 3 is an explanatory diagram for explaining a function and effect of the first embodiment of the present invention.

4 (a) and 4 (b) are partially cutaway vertical cross-sectional explanatory views of a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of a third embodiment of the present invention.

FIG. 6 is an explanatory diagram of a fourth embodiment of the present invention.

FIG. 7 is an explanatory diagram for explaining the function and effect of the second embodiment to the fourth embodiment of the present invention.

8 (a) and 8 (b) are explanatory views of the essential parts of the fifth or sixth embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a breakage state of a conventional rooting pile.

[Explanation of symbols]

1… Reinforcement structure of root pile 2… Rooting part 3… Ready-made pile 3a ... Tip 4 ... unevenness 5 ... End plate 6 ... window 7… Steel pipe 8… Steel pipe 9 ... Punched piece 10 ... Reinforcing cage 11 ... Rebar cage 11a ... steel rod 11b ... spiral rebar 12… Ring groove 13 ... Convex ring 51 ... root fixative 52… Ready-made pile 53 ... Root consolidation structure

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kensei Nishimoto             3-24 Aoi 3-chome, Higashi-ku, Nagoya-shi, Aichi             -Con Co., Ltd. F-term (reference) 2D041 AA03 BA13 CA03 CB06 DA01                       DB02 DB03 EB07 EB08 EB10                       FA04

Claims (3)

[Claims] 1. A method for constructing a rooting pile by forming a support base by inserting a ready-made pile after filling a rooting liquid such as cement milk into the hole drilled in the ground. A method for reinforcing a root-mounting pile, characterized in that unevenness is provided in advance on the outer circumference and / or the inner circumference of the tip of a ready-made pile to be inserted into the root-hardening liquid. 2. The method of reinforcing a peg as claimed in claim 1, wherein a window through which a puddle can flow is pre-drilled at the tip of the ready-made pile provided with the unevenness. 3. The reinforcing member such as a steel pipe with a window or a reinforcing bar cage, which is separately formed, is integrally attached to the tip edge of the tip portion of the ready-made pile provided with the unevenness for construction. Reinforcement method for soil consolidation piles.