JP2007162412A - Pile head vibration damping cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile head vibration damping cap light in weight as a whole and simplified in structure to facilitate assembling work or the like and to facilitate also repair work to reduce cost. <P>SOLUTION: The pile head vibration damping cap 1 comprises a plate body with reinforcements inserted therein to attain fixing to an upper skeleton; an inner cylinder which is a cylindrical body fixed to the lower side of the plate body and having a press-in hole in the upper part; an outer cylinder which is a cylindrical body fitted to the inner cylinder and to the pile head at the lower part and having a filler extraction hole in a lower position; an expansion member 13 expansive injected inside the inner cylinder from the press-in hole; and a filler 14 filled in a partial space between the inner cylinder and outer cylinder. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pile head vibration damping cap that protects a pile head and attenuates building vibration so that it can be easily replaced when damaged by an earthquake or the like.

  Conventionally, in order to connect the pile head firmly to the foundation footing, as shown in FIG. 8, the reinforcing bars 15 are protruded from the pile head 16 and integrated with the concrete of the foundation portion 17. Some pile heads have a seismic isolation function. Furthermore, in order to reduce labor-intensive work such as bar arrangement, for example, a cap body to be mounted on the pile head, anchor bars provided on the cap body, and a fixing member formed on the side wall of the cap body There has been known one provided with an insertion hole and a fixing member that is inserted into the insertion hole and the pile head to fix the cap body to the pile (see Patent Document 1).

Japanese Patent Laid-Open No. 11-61847

  However, in the conventional pile head reinforcement cap, the anchor bars are arranged up to the inside of the concrete, so it takes time to construct it, and if it is affected by an earthquake etc., it will be difficult to dismantle . In addition, as in other conventional examples, it is costly to give the pile head a seismic isolation function.

  Furthermore, in order to reinforce the existing pile head, the work is performed at the lower part of the foundation, the work environment is poor, and the work is extremely dangerous. In order to repair a pile head damaged by an earthquake or the like, it is necessary to receive the building with a jack or the like, which increases the cost. The pile head vibration damping cap according to the present invention has been proposed in order to solve such a problem.

The gist for solving the above-mentioned problems of the pile head vibration damping cap according to the present invention is achieved by fixing a plate body in which reinforcing bars for fixing to the upper frame are implanted, and the plate body. An inner cylinder formed with a press-fitting hole in the upper part of the cylinder, and a cylinder that is fitted to the inner cylinder and fitted to the lower pile head, and is provided with a filling removal hole at the lower position. An outer cylinder, an expandable / contractible member in which an expansion / contraction member is injected from the press-fitting hole into the inner cylinder, and a filling material filled in a partial space portion of the inner cylinder and the outer cylinder; It consists of
The filler is sand;
Furthermore, the elastic member is formed by injecting gas or liquid into a bag formed of an elastic member, or is a hardening liquid directly injected into the inner cylinder;
Is included.

  According to the pile head vibration damping cap of the present invention, the structure is simple and the assembly and disassembly thereof can be simplified. In the event of an earthquake, especially, sand that has been filled against the vertical vibrations of a direct earthquake acts as a cushion to protect the building by reducing the vibration. In addition, when a pile head is damaged by an earthquake, the bag body can be extended by filling a gas or a hardened liquid through a press-fitting hole that is an injection port at the upper part of the inner cylinder without using a jack. You can easily fix a building that has become unlandable by lifting it up or pulling out the filling sand at the bottom of the outer cylinder and jacking it down. In addition, the work safety in the pile head processing is high, and the workability can be improved even in a narrow work space by jacking up and down the pile head vibration damping cap itself. Also in the manufacturing cost of the pile head vibration damping cap, the number of parts is reduced and it is excellent in economic efficiency.

  A pile head vibration damping cap 1 according to the present invention, as shown in FIGS. 1 to 2, includes a steel plate body 3 in which reinforcing bars 2 are fixed to be fixed to an upper frame that is a foundation of a building, An inner cylinder 6 in which a press-fitting hole 5 is provided at an upper portion of a steel or synthetic resin cylinder 4 fixed under the plate body 3 and the inner cylinder 6 are roughly fitted in dimensions. And a cylindrical body 7 made of steel or synthetic resin that fits into the lower pile head 10, and as shown in FIG. There is.

  As shown in FIG. 3, a nut 8 a is welded to the filling hole 8 and is fixed to the outer cylinder 7. The hole 8 is closed by a bolt 8b that is barely attached to the nut 8a. By loosening and removing the bolt 8b, the sand 14 which is a filling material filled in the inner cylinder 6 and the outer cylinder 9 is caused to flow out, the pressure is lowered and the height of the jack is increased. It is to shorten.

  A cylindrical cap portion 11 fixed to a steel cap bottom plate 12 is fitted to the pile head 10. As shown in FIG. 4, there is a bag 13 which is provided inside the inner cylinder 6 and is an elastic member, for example, a rubber or a synthetic resin, which is a telescopic member that can expand and contract. Inside the bag 13 is injected a gas or a liquid that hardens with some elasticity as a fluid. A pressurizing valve 13a for preventing the backflow of the gas or liquid is provided. The pressurizing valve 13 a is inserted into the press-fitting hole 5 of the inner cylinder 6.

  The inner cylinder 6 is filled with a uniform granule or sand 14 as a filling material in the space excluding the bag 13. The cylinder 7 of the outer cylinder 9 is also filled with sand 14.

  A method for assembling the pile head vibration damping cap 1 according to the present invention will be described. First, the inner cylinder shown in FIG. 1 is installed upside down. Next, the bolt 8 b is barely attached to the nut 8 a of the outer cylinder 9. The bag 13 is inserted into the inner cylinder 6 and installed. A pressurizing valve 13a protrudes from the press-fitting hole 5 to the outside.

  The inner cylinder 6 is filled with sand 14 and pressed. Then, the outer cylinder 9 is put on the inner cylinder 6. They are turned upside down and returned to their original positions, and this pile head vibration damping cap 1 is installed and fixed on a desired pile head 10. This fixing may be performed by welding or the like.

  In another embodiment, the bag 13 may not be used in forming the elastic member. In this case, after the inner cylinder 6 and the outer cylinder 9 are filled with sand 14, the liquid is directly injected from the pressurizing valve 13a with a pressure pump from the state shown in FIG. is there. This liquid penetrates slightly into the filled sand 14 (about 10% of the whole) and hardens with some elasticity. This is a member for expansion and contraction. Therefore, it can be constructed when jacking up. In this way, the bag 13 can be omitted, the number of parts can be reduced, and the cost can be reduced.

  Thus, although the pile head vibration damping cap 1 is comprised, when the said pile is a new construction, when the pile is installed, it fixes to the pile head and installs. Further, when the building is corrected, a gas, liquid, gel body, hardened material, or the like suitable for the construction purpose is injected into the existing pile head vibration damping cap 1 from the pressure valve 13a with a pressure pump. As a result, the bag body 13 extends and the height of the pile head vibration damping cap 1 increases.

  Further, the sand 14 filled in the inner cylinder 6 is pulled out of the bolt 8b of the hole 8 for filling removal, and the sand 14 is discharged to the outside, so that the height of the pile head damping cap 1 is reduced. The pile head damping cap 1 is replaced and the pile head is corrected. In addition, when a pile is newly installed under the existing building, a pile is newly installed in the lower part of the foundation of the building, and a pile head vibration damping cap 1 is installed on the head of the pile to improve the vibration and earthquake resistance of the building. It is something to be demonstrated.

It is a front view (A) of the inner cylinder 6 of the pile head vibration damping cap 1 which concerns on this invention, and sectional drawing (B) along the AA line. It is sectional drawing (B) along the front view (A) and the BB line of the outer cylinder 9 of the pile head damping cap 1 of the same invention. It is a partial expanded sectional view of the same pile head vibration damping cap. It is a front view of the bag body 13 in the pile head vibration damping cap 1. It is sectional drawing (A) in the state which the bag body 13 is contracting in the use condition of the pile head vibration damping cap 1, and sectional drawing (B) in the state expanded and expanded. It is a perspective view in case the pile head vibration damping cap 1 is a square shape. It is a perspective view in case the same pile head vibration damping cap 1 is a round shape. It is explanatory drawing which shows the structure of the pile head which concerns on a prior art example.

Explanation of symbols

1 Pile head vibration damping cap,
2 Rebar,
3 plates
4 cylinders,
5 Press-in holes,
6 inner cylinder,
7 cylinder,
8 Filling hole,
8a nut,
8b bolt,
9 outer cylinder,
10 Pile head,
11 Cap part,
12 Cap bottom plate,
13 bags
13a Pressurizing valve,
14 Sand,
15 Rebar,
16 Pile head,
17 Foundation.

Claims (3)

A plate body in which reinforcing bars to be fixed to the upper housing are planted, and an inner cylinder in which a press-fitting hole is provided in the upper part of the cylinder body fixed under the plate body;
A cylinder that fits with the inner cylinder and fits into the lower pile head, and an outer cylinder that is provided with a filling removal hole at a lower position;
A telescopic member that is telescopically stretched by injecting a telescopic member from the press-fitting hole into the inner cylinder;
A filler filled in a partial space between the inner cylinder and the outer cylinder;
Consisting of,
Pile head anti-vibration cap characterized by The filling is sand,
The pile head vibration damping cap according to claim 1, wherein: The elastic member is a gas or liquid that is injected into a bag formed of an elastic member, or is a hardening liquid that is directly injected into the inner cylinder.
The pile head vibration damping cap according to claim 1 or 2, wherein

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