JPH1121915A - Pile head joining method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method of joining pile heads which is excellent in earthquake resistance and can keep costs low. SOLUTION: In a method of joining a pile head buried underground to a structure skeleton, a concrete structure is constructed by mounting a joint bar around a pile head and buried underground to build a structure skeleton. A method of joining pile heads, wherein concrete is also cast around joints at the pile heads at the time of casting, and the pile heads and the structural body are integrally joined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for joining pile heads.

[0002]

2. Description of the Related Art As a joining method of a pile head buried underground and a structural body, a concrete filling c with a reinforcing bar b is provided at the center of a ready-made concrete pile a shown in FIG.
, Which are reinforced by filling in the middle, are often used. As shown in FIG. 8, there is also known an SC pile type in which a steel pipe d is wound around an outer periphery of a precast concrete pile of the above-mentioned medium-filled reinforcement type.

[0003]

The above-mentioned conventional method of joining pile heads has the following problems. <B> In the Hyogoken-Nanbu Earthquake, it was found that brittle fracture occurs in the joining method of pile heads of the middle-filled reinforced type using a combination of ready-made concrete piles and middle-filled concrete, which is not preferable for earthquake resistance. I understand. <B> The SC pile type has excellent seismic performance,
Since steel pipes are used for the entire pile, the cost is high.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method of joining pile heads which is excellent in earthquake resistance and can keep costs low.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method of joining a pile head buried in the ground to a structural body, wherein a joint bar is attached to the periphery of the pile head to be built in the ground. Including
When the concrete for constructing the structural body is poured, concrete is also poured around the joint bar of the pile head, and the pile head and the structural body are integrally joined. It is a method of joining the head. The present invention relates to a method of joining a pile head buried underground with a structural body,
Attach a joint bar around the pile head, further embed the joint bar around the pile head, cast concrete and harden, then lay the pile underground to build a structural body A method of joining pile heads, comprising casting concrete to be piled and integrally joining the pile head and a structural body. The present invention relates to a method of joining a pile head buried underground to a structural body, by attaching a joint bar around the pile head, storing the joint bar, and attaching a pipe body. ,
This pipe body is buried in the ground, and at the time of casting concrete for constructing a structural body, concrete is also poured into the pipe body, and the pile head and the structural body are integrally joined. This is the method of joining pile heads. The present invention relates to a method for joining a pile head buried underground to a structure body, in which a joint bar is attached around the pile head, the joint bar is housed, and a pipe is attached. After casting concrete in the pipe and curing it, this pipe is built underground,
Casting concrete for constructing a structure skeleton, characterized in that the pile head and the structure skeleton are integrally joined,
It is a method of joining pile heads.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for joining pile heads according to the present invention will be described below with reference to the drawings.

<A> Step of arranging joint bars on a ready-made concrete pile A joint bar 3 is arranged on a ready-made concrete pile 2 to be joined to the structural body 1. As shown in FIGS. 1 to 3, the joining bar 3 is a member attached around the head of the ready-made concrete pile 2.
The concrete 4 is poured into the head of the ready-made concrete pile 2 on which the joint bars 3 are arranged so as to wrap around from the outer periphery of the joint bars 4 by a process described later. At this time, concrete 4
Is set to have a diameter larger than the diameter of the ready-made concrete pile 2. Thereby, by increasing the diameter of the head of the ready-made concrete pile 2 on which the concrete 4 is cast, which is the part where the shearing force applied to the ready-made concrete pile 2 acts most, this part can be reinforced. Prevent brittle destruction of concrete pile 2. As the joining bar 3, a member surrounding the head of the ready-made concrete pile 2, for example, a member in which a reinforcing bar is formed in a cylindrical cage shape can be used. At this time, a well-known steel wire or the like is disposed as an anchoring bar 5 on the head end plate of the ready-made concrete pile 2 and the anchoring bar 5 and the joining bar 3 are joined by a known means such as welding, so that the ready-made concrete pile 2 is joined. It is conceivable to further enhance the integration between the structure 2 and the structural body 1.

<B> Step of Building Precast Concrete Pile By the above-described steps, the ready-made concrete pile 2 having the joint bar 3 attached around the head is built together with the joint bar 3 into the site soil. At this time, as shown in FIG. 2, the portion where the joining bar 3 is located in the structural body 1 located above the middle of the ready-made concrete pile 2 has a diameter larger than the diameter of the ready-made concrete pile 2. It is built so as to be accommodated in the space in the ground formed as above. Thereby, a reinforcing portion having a diameter larger than that of the ready-made concrete pile 2 can be formed at the upper end of the pile 2 where the shear force applied to the ready-made concrete pile 2 acts most.
Brittle destruction of the junction with the metal can be prevented.

<C> Concrete placing process After the ready-made concrete pile 2 is erected, the structure skeleton 1
Concrete 4 for constructing the concrete. On this occasion,
The structural frame 1 and the joint bar 3 attached around the head of the ready-made concrete pile 2 are in the same space, and when the concrete 4 is poured into the structural frame 1, the joint bar 3 and the space around it are also Concrete 4 is filled. As a result, as shown in FIG. 3, the joint body 3 of the prefabricated concrete pile 2 and the structural body 1 are integrated, and the prefabricated concrete pile 2 and the structural body 1 are integrally joined.

[0010]

Embodiment 2 Hereinafter, another embodiment of a method for joining a pile head will be described with reference to the drawings.

In the method of joining a pile head described in the first embodiment of the present invention, a reinforcing portion consisting of a joint bar 3 attached around the head of a ready-made concrete pile 2 and concrete 4 is formed by casting the concrete 4 in place. However, it is also conceivable to provide a precast concrete block 6 in advance on the head of the ready-made concrete pile 2 as shown in FIG. In this case, the block 6 made of precast concrete (hereinafter referred to as the block 6) is manufactured to have a diameter larger than the diameter of the ready-made concrete pile 2 and the brittleness of the joint between the ready-made concrete pile 2 and the structural body 1 is made. Against destruction.

The block body 6 has joint bars 3 and reinforcing bars (not shown) to the structural body 1 to obtain a predetermined rigidity and to take into consideration the jointability to the structural body 1. deep. The block body 6 has, for example, a cylindrical shape, and is formed in advance around the head of the ready-made concrete pile 2, and the fixing bar 3 in which the connecting bar 3 arranged in the block body 6 is attached to the end plate of the head of the ready-made concrete pile 2. It is conceivable to join them in advance and integrate them by known means such as welding. Then, similarly to the first embodiment of the invention, when the concrete 4 is poured into the structural body 1, the head of the block body 6 and the joint bars 3 are buried integrally in the concrete 4, and the ready-made concrete The pile 2 and the structural body 1 are integrally joined.

[0013]

Embodiment 3 Hereinafter, another embodiment of a method for joining a pile head will be described with reference to the drawings.

First, the method of joining a pile head according to an embodiment of the present invention is different from the first and second embodiments of the present invention in the vicinity of the head of a ready-made concrete pile or the periphery of a precast concrete block. A known pipe body 7 such as a steel pipe is attached to and brought into contact with the pipe. Then, as shown in FIG. 5, the joint bar 4 is arranged in the space between the ready-made concrete pile 2 and the pipe 7, and the pipe 7 is built together with the ready-made concrete pile 2 in the site soil. At this time, the upper end of the pipe 7 is positioned so as to protrude as long as necessary toward the structure skeleton 1 in order to enhance the bonding property with the structure skeleton 1. afterwards,
When the concrete 4 is poured into the structural body 1, the concrete 4 is also poured into the space between the head of the ready-made concrete pile 2 and the pipe 7. Through the above steps, the structural body 1 and the ready-made concrete pile 2 can be integrally joined as shown in FIG. Although not shown, when a precast concrete block body is provided at the head of a ready-made concrete pile, when casting the concrete and forming the block body at the upper end of the pile, a pipe body is formed around the outer periphery of the formed block body. It is conceivable that the block is formed so that the concrete and the pipe are integrated with each other.

[0015]

Embodiment 4 Hereinafter, another embodiment of a method for joining pile heads will be described with reference to the drawings.

In the method of joining a pile head described in the first embodiment of the present invention, concrete 4 is cast in place into a joint bar 3 provided around the head of a ready-made concrete pile 2. Explained. On the other hand, as shown in FIG. 6, a known pipe 8 such as a steel pipe is arranged at a predetermined distance around the outer periphery of the head of the ready-made concrete pile 2, and the pipe 8 and the ready-made concrete pile 2 are connected to each other. It is also conceivable to put concrete 4 in between and integrate it with the ready-made concrete pile 2. That is, in the process of the first embodiment of the present invention, when the ready-made concrete pile 2 and the joint bar 3 are erected in the soil at the site, the diameter of the joint in the area where the joint bar 3 is located is smaller than that of the ready-made concrete pile 2. By placing concrete 4 on the structural body 1
With the pipe 8 integrated with the outer periphery of the head of the ready-made concrete pile 2, the ready-made concrete pile 2 can be integrally joined to the structure skeleton 1, and the structure skeleton 1 and the ready-made concrete pile 2 can be joined together. Brittle destruction of the joint can be prevented. FIG. 6 shows an example in which the joining bar 3 and the anchoring bar 5 of the ready-made concrete pile 2 are integrated by a known joining technique such as welding.

In the second embodiment of the present invention, the formation of the precast concrete block 6 on the head of the ready-made concrete pile 2 has been described.
On the other hand, although not shown, a known pipe such as a steel pipe is arranged at a predetermined distance around the outer periphery of the block formed on the head of the ready-made concrete pile, and between the pipe and the block, It is also conceivable to fill concrete at the time of placing concrete to construct a structural body. That is, in the process of the second embodiment of the invention, by positioning a pipe having a larger diameter than the block body, the head of the ready-made concrete pile integrated with concrete by casting into the structure body, that is, the block body The pipe can be integrated and attached to the outer periphery. As a result, the strength of the joint between the prefabricated concrete pile and the structural body integrally joined together can be increased, and brittle destruction can be prevented.

[0018]

【The invention's effect】

<B> The pile and the structure body can be easily and completely bonded. Therefore, brittle destruction does not occur at the head of the pile during an earthquake, and a joint structure preferable for earthquake resistance can be obtained. <B> It is not necessary to use expensive piles using steel pipes for the entire pile body such as the SC pile, and it is sufficient to cover only the head of the pile with the pipe body, so that the construction cost can be reduced. <C> With a simple process, it became possible to securely connect the structural body and the pile.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a process of arranging joint bars on a ready-made concrete pile.

[Fig. 2] Illustration of the process of building a ready-made concrete pile

FIG. 3 is an explanatory view at the time of joining a ready-made concrete pile and a structural body.

FIG. 4 is an explanatory view at the time of joining a pile head according to a second embodiment of the invention;

FIG. 5 is an explanatory view at the time of joining a pile head according to Embodiment 3 of the present invention.

FIG. 6 is an explanatory view at the time of joining a pile head according to Embodiment 4 of the present invention.

FIG. 7 is an explanatory view 1 of a conventional joint part of a pile head.

FIG. 8 is an explanatory view 2 of a conventional joint part of a pile head.

Claims (4)

[Claims] 1. A method for joining a head of a pile built in the ground to a structure body, wherein a reinforcing bar is attached around a pile head and built in the ground to build a structure body. A method for joining a pile head, comprising: casting concrete also around a joint bar of the pile head at the time of placing concrete, and integrally joining the pile head and a structural body. 2. A method for joining a head of a pile built in the ground to a structural body, comprising: attaching a joint bar around a pile head; and attaching the joint bar around a pile head. After embedding and casting and hardening concrete, the pile is buried in the ground, concrete for constructing a structure skeleton is cast, and the pile head and the structure skeleton are integrally joined. Characteristic, pile head joining method. 3. A method for joining a head of a pile built in the ground to a structural body, wherein a joining bar is attached around the pile head, and the joining bar is housed and a tube is attached. Later, when this pipe is buried in the ground and concrete for constructing a structural body is poured, concrete is also poured into the pipe, and the pile head and the structural body are integrally joined. A method of joining pile heads. 4. A method for joining a head of a pile built in the ground to a structural body, comprising: attaching a joint bar around a pile head; storing the joint bar; and attaching a pipe body. After concrete is poured into the pipe and hardened, this pipe is built in the ground, concrete for constructing the structural body is cast, and the pile head and the structural body are integrally joined. A method of joining pile heads.