JP2003268786A - Head joining structure for pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head joining structure for a pile capable of alleviating an earthquake effect furthermore than prior art, improving aseismatic strength against pitching, and improving workability regarding joining work with a structure side. <P>SOLUTION: A deforming member 4 comprising rubber or the like is installed around an upper part of an upper end face and side faces near an upper end of the pile 1. A top face and side faces of the deforming member are crowned by a cap like rigid member 8 comprising steel or the like. A plurality of headed bolts 5 or double end studs loosely inserted with space in a plurality of insertion holes 9 formed on the rigid member 8 are screwed through the deforming member into a pile head end plate 3 provided on the upper end face of the pile 1. A reinforcement 10 is installed on a top face of the rigid member 8. By integrally forming the deforming member 4 like a cap also, the workability can be improved. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a joint structure between a pile head such as a concrete pile and a structure side.

[0002]

2. Description of the Related Art In the conventional pile head joint structure, it is common to regard the joint form between the pile head and the structure side as a rigid joint. However, when a large earthquake is encountered, the stress concentrates on the pile head joint, the bending moment becomes excessive, and there is a technical problem that the pile head joint may be destroyed. Therefore, in order to protect the pile head joints from damage due to an earthquake, a sliding material should be interposed at the joint between the pile head and the structure side, or the structure should be rotatably supported by the pin head. Also, a pile head joining technique based on soft joining, in which the seismic action is alleviated to protect from damage, has been disclosed (Japanese Patent Laid-Open Nos. 10-227039 and 8-12087). By the way, in these conventional techniques, since the technical form in which the structure side is placed on the pile head is adopted, there is a strength problem that the seismic strength against upward seismic force, that is, vertical vibration is weak. However, there was a problem in construction that it took time to construct the pile head joint.

[0003]

SUMMARY OF THE INVENTION The present invention has been developed in view of the above-mentioned conventional technical conditions, and can further alleviate the seismic effect, improve the seismic resistance against pitching, and improve the structure. It is an object of the present invention to provide a head head joint structure for a pile that can improve the workability in connection with the object side.

[0004]

In order to solve the above problems, according to the invention of claim 1, a deformable member made of rubber or the like is installed around the upper part of the upper end surface of the pile and the side surface near the upper end, and the deformable member. The upper and side faces of the cap are capped with a rigid member made of a steel plate or the like, and a plurality of bolts loosely inserted with a gap in a plurality of insertion holes formed in the rigid member are passed through the deformable member to be mounted on the pile. The technical means of screwing to the pile head end plate provided on the end face and installing the reinforcing bar on the upper surface of the rigid member was adopted. The deformation member and the rigid member may be installed and bolts may be screwed to the pile head end plate before or after. According to the present invention, the seismic energy can be absorbed not only by the flat plate portion of the deformable member that is in contact with the upper end surface of the pile but also by the cylindrical portion that is in contact with the side surface near the upper end of the pile. It is possible to improve the earthquake resistance. Further, since the plurality of bolts are configured to be screwed to the pile head end plate provided on the upper end surface of the pile by penetrating the rigid member and the deformable member, the rigid member and the deformable member come off from the pile head. Since this is surely prevented, the seismic strength against vertical vibration can be improved. According to the second aspect of the present invention, a technical means is adopted in which the deformable member is integrally formed in a cap shape, and the upper portion of the upper end surface of the pile and the periphery of the side surface near the upper end are crowned. According to the present invention, the cap-shaped deforming member is crowned on the pile head, and the cap-shaped rigid member is crowned on the deforming member. A simple work procedure, in which rigid members are sequentially or pre-crowned and piled and piled on the pile head, is possible, and accurate positioning on the structure side is realized, greatly improving workability. Can be improved.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention can be applied to various pile head joint structures. The cross-sectional shape and material of the pile does not matter. The deformable member may be made of an appropriate deformable material such as rubber, which is suitable for alleviating seismic action by absorbing seismic energy by deformation. The flat plate portion that covers the upper part of the upper end surface of the pile that constitutes this deformable member and the cylindrical portion that covers the periphery of the side surface near the upper end of the pile may be made of the same material or different materials. Good. For example, since the weight of the structure does not always directly act on the tubular portion, the tubular portion may be made of a material softer than the flat plate portion. Further, the flat plate portion and the tubular portion forming the deformable members may be formed separately or may be integrally formed in a cap shape. On the other hand, the rigid member is
A cap-shaped member is formed from a steel plate or the like having rigidity that does not hinder the support of the structure to the pile, and is capped on the upper surface and the side surface of the deformable member. In addition, the plurality of bolts screwed to the pile head end plate provided on the upper end surface of the pile penetrating the rigid member and the deformable member may be a headed bolt as in the following examples, or a double screw bolt. It is also possible to use a form in which a portion corresponding to the head is screwed on later. By the way, in the case of a construction in which both screw bolts are first screwed to the pile head end plate, the deformable member and the rigid member can be installed with the assembled two screw bolts as guides, which is effective for improving the workability. is there.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded construction drawing showing a construction procedure in one embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a completed state of the construction, and FIG. 3 is a longitudinal sectional view showing a state subjected to seismic action. It is a figure. In the figure, reference numeral 1 denotes a pile, and a pile head end plate 3 having a plurality of female screws 2 formed around the upper end surface of the pile 1
Is installed. As illustrated, the deformable member 4 according to the present embodiment integrally includes a flat plate portion 4a that covers the upper portion of the upper end surface of the pile 1 and a tubular portion 4b that covers the periphery of the side surface near the upper end of the pile. Formed into a cap shape. An insertion hole 6 for a plurality of headed bolts 5 is formed in the flat plate portion 4a, and a brim portion 7 is provided at the lower end portion of the tubular portion 4b. Further, the rigid member 8 is formed in a cap shape including a flat plate portion 8a and a tubular portion 8b so that the deformable member 4 can be capped, and the flat plate portion 8a has a plurality of headed bolts 5.
Through hole 9 was formed. The insertion hole 9 formed in the flat plate portion 8a needs to be formed as a loose hole so that it can be loosely inserted with a gap so that the bolt 5 and the rigid member 8 can relatively move during an earthquake. In the case of the insertion hole 6 formed in the flat plate portion 4a of the deformable member 4, it is not necessary to make it a loose hole. Further, the flat plate portion 8a of the rigid member 8
A plurality of reinforcing bars 10 for joining with a structure were installed on the upper surface of the by welding.

Therefore, when a structure is joined to the pile 1 installed at a predetermined position of the ground 11 as shown in FIG. 1, the concrete 12 projected on the ground 11 is projected above. The following preparatory work for joining will be carried out on the pile head 13 thus formed. That is, in the present embodiment, first, the cap-shaped deforming member 4 is capped on the pile head 13, and the cap-shaped rigid member 8 is further capped on the outer side of the deforming member 4. In this case, the deformation member 4 is previously
It is also possible to crown the rigid member 8 and then crown the pile head 13. Then, the plurality of head bolts 5 are inserted into the through holes 9 formed in the flat plate portion 8a of the rigid member 8 and the through holes 6 formed in the flat plate portion 4a of the deformable member 4, and the pile head end plate 3 is inserted.
It is screwed into the female screw 2 formed in 1. At that time, in this embodiment, a washer 14 with an elastic material is interposed between the headed bolt 5 and the rigid member 8, and the action on the headed bolt 5 is caused by the rotation moment acting on the pile head joint portion during an earthquake. Is configured to be able to relax. Further, a protective cap 15 made of a deformable member such as an elastic material is attached above the head of the headed bolt 5 in order to relieve the compressive force from the structure.
Further, a deformable member such as an elastic material may be filled or inserted in a gap formed between the insertion hole 9 formed in the flat plate portion 8a of the rigid member 8 and the headed bolt 5.

When the mounting of the deformable member 4 and the rigid member 8 to the pile head 13 is completed by the above work,
As shown in FIG. 2, the foundation concrete 16 on the structure side
By staking, the joining work on the structure side to the pile head 13 of the pile 1 is completed. Then, the concrete 16 on the structure side is deformed by the deformable member 4 with respect to the pile 1 as described above.
Since they are joined in the state of being interposed, the deformation member 4 deforms and absorbs the seismic energy as shown in FIG. 3 when an earthquake is applied, so that the influence on the structure is mitigated. In that case, not only the energy absorption due to the deformation of the flat plate portion 4a of the deformable member 4 but also the energy absorption due to the deformation of the tubular portion 4b is added, so that the effect of mitigating the seismic action on the structure can be increased. Further, the deformation of the washer 14 with the elastic member and the deformation of the member filled or inserted in the gap between the insertion hole 9 and the headed bolt 5 at the time of earthquake are also effective for alleviating the seismic action on the structure. As described above, the addition of the energy absorption due to the deformation of the tubular portion 4b of the deformable member 4 reinforces the seismic strength particularly against rolling. Further, the installation of the headed bolt 5 reliably prevents the rigid member 4 and the deformable member 8 from coming off the pile head 13, and improves the seismic resistance against vertical pitching. Further, when the deformable member 4 is integrally formed in a cap shape as in this embodiment, the deformable member 4 and the rigid member 8 are capped on the pile head 13 and the headed bolt 5 is inserted. Just by inserting it into the holes 6 and 9 and screwing it into the female screw 2 formed on the pile head end plate 3, the preparatory work for joining the pile 1 to the structure side is completed, so the workability is greatly improved. To be done. Regarding the installation of the reinforcing bar 10 on the rigid member 8, it is possible to employ an appropriate fixing means such as screw connection instead of the above-mentioned welding.

[0009]

According to the present invention, the following effects can be obtained. (1) In the invention of claim 1, a deformable member made of rubber or the like is installed around the upper part of the upper end surface of the pile and the side surface near the upper end,
Since the technical means of capping the upper and side surfaces of the deformable member with a cap-shaped rigid member made of steel plate or the like is adopted, not only the flat plate portion of the deformable member in contact with the upper end surface of the pile but also the side surface near the upper end of the pile Since the seismic energy can be absorbed even in the tubular portion in contact with the seismic energy, more seismic energy can be absorbed, and the seismic resistance can be improved. (2) Moreover, since the plurality of headed bolts are configured to be screwed to the pile head end plate provided on the upper end surface of the pile by penetrating the rigid member and the deformable member, these rigid members and deformable members are Since it is surely prevented from coming off from the head,
Seismic strength against vertical vibration can be improved. (3) In the invention of claim 2, since the deformable member is integrally formed in a cap shape, and the technical means of crowning the upper part of the upper end face of the pile and the side face around the upper end is adopted,
Since the cap-shaped deformable member is crowned on the pile head, and the cap-shaped rigid member is crowned on the deformed member, the deformable member and the rigid member are sequentially or at the time of construction. It enables a simple work procedure of crowning the pile head in a state of being crowned in advance and overlapping,
Moreover, since accurate positioning on the structure side is realized, the workability can be greatly improved.

[Brief description of drawings]

FIG. 1 is an exploded construction diagram showing a construction procedure in an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a completed state of construction.

FIG. 3 is a vertical cross-sectional view showing a state of being subjected to an earthquake action.

[Explanation of Codes] 1 ... Pile, 2 ... Female thread, 3 ... Pile head end plate, 4 ... Deformation member, 4
a ... Flat plate portion, 4b ... Cylindrical portion, 5 ... Head bolt, 6 ... Insertion hole, 7 ... Collar portion, 8 ... Rigid member, 8a ... Flat plate portion, 8b
... Cylindrical part, 9 ... Insertion hole, 10 ... Reinforcing bar, 11 ... Ground, 12
... Concrete, 13 ... Pile head, 14 ... Washer with elastic material, 15 ... Protective cap, 16 ... Foundation concrete

Claims (2)

[Claims] 1. A deformable member made of rubber or the like is installed around the upper part of the upper end face of the pile and the side face near the upper end, and the upper and side faces of the deformable member are capped with a cap-shaped rigid member made of steel plate or the like. Along with, a plurality of bolts loosely inserted with a gap in a plurality of insertion holes formed in the rigid member are screwed to the pile head end plate provided on the upper end surface of the pile through the deformable member, and A head joint structure for a pile that joins a pile and a structure side, characterized in that a reinforcing bar is installed on the upper surface. 2. The deformable member is integrally formed in a cap shape so as to be capped around the upper part of the upper end surface of the pile and the side surface near the upper end. Pile head joint structure.