JP4691078B2 - Pile head ring - Google Patents

Description

  The present invention relates to a pile head ring.

In the case of deep foundation piles, new piles are added to the top of existing piles and driven into the ground. Since joining between piles affects the support load, various joining structures and construction methods have been developed. For example, a method of welding end plates to each other is disclosed in Japanese Patent Application Laid-Open No. 10-112467. A method of fastening flange plates with bolts is disclosed in Japanese Patent Application Laid-Open No. 2002-121733, and a method of using connection pieces and bolts is disclosed in Japanese Patent Application Laid-Open No. 2005-299243.
Japanese Patent Laid-Open No. 10-121467 JP 2002-121733 A JP-A-2005-299243

  A method for connecting piles disclosed in Japanese Patent Application Laid-Open No. 10-112467 is as follows, referring to paragraphs [0026] and [0027]. A screw hole 4 is provided in a cylindrical side plate 3 attached to the outer periphery of the end plate 2. When joining the piles A to each other, the end plates 2 and 2 are brought into contact with each other, the arc-shaped connection piece 7 is applied to the outer peripheral surfaces of the two, and the hexagonal bolt 9 is screwed into the screw hole 4 through the bolt hole 8 of the connection piece 7. Thereby, the opposing piles A are joined.

  According to this publication, paragraph [0017] describes that the cylindrical side plate 3 is formed by welding to the surface 2b of the end plate 2, but it is a matter of course that the welding operation is troublesome. At the end of the paragraph, there is a statement that the end plate 2 and the cylindrical side plate 3 in the joint member B may be formed by machining a large steel material, but the cutting work also takes time. It is a hard work.

In JP-A-2002-121733, in the paragraphs [0026] and [0027], a flange plate 4 having a diameter larger than the pile diameter of the pile 1 is previously welded to the end plate 2 at the pile end, and the pile 1 is built. There is a description that the flange plates 4 of the upper and lower piles 1a, 1b are brought into contact with each other while the small holes a are in contact with each other and the bolts 5 passed through the small holes a are joined.
The work of welding the flange plate 4 to the end plate 2 at the end of the pile is also a troublesome work, although the field work by factory production can be omitted.

In the end plates of ready-made concrete piles disclosed in JP-A-2005-299243, when joining the piles, as shown in FIG. 4, the main ring members 3 (end plate portions; end plates) are connected to each other. It is supposed to be welded.
Joining by welding is an on-site operation, which is cumbersome and depends on the weather when working outdoors.

  The pile head ring according to the present invention includes an end plate portion, a cylindrical body portion projecting from the outer peripheral edge portion of the end plate portion in a direction perpendicular to the end plate portion, and radiation passing through the center of the cylindrical body portion. A concave portion formed on the outer peripheral surface of the cylindrical body portion toward the center, and a fastening plate portion having a notch portion in which the shaft portion of the bolt can enter and exit from the outside in the concave portion. Then, the fastening plate portions are integrated by inserting the shaft portion of the bolt into the notch portion arranged on the same axis line of the opposing pile head rings, screwing the nut into the bolt, and tightening. Thereby, piles are mutually connected firmly.

  As usual, the pile is locked in a locking hole with each end pierced on the circumference of the pile head ring with tension applied to a tension material such as a PC steel rod and filled with concrete. Molded. When connecting the piles, the nuts may be screwed into the bolts in advance. In this case, the distance between the bolt head and the nut is set larger than the thickness of the two fastening plate portions. With both fastening plate portions overlapped, the head portion of the bolt is directed to one recessed portion, the nut is directed to the other recessed portion, and the shaft portion is inserted into the notched portion. Here, bolts and nuts are tightened, but the tightening force can be appropriately adjusted.

  As described above, when connecting the pile head rings, it is not necessary to insert a bolt into the bolt hole and then screw and tighten the nut to the other end of the bolt as in the conventional case. If the shaft portion of the bolt is inserted from the outside into the notch portion while the nut is screwed onto the bolt, the nut is only tightened, the work is simple, and the tightening force can be appropriately adjusted.

  Casting is desirable for manufacturing, but sheet metal processing may also be used. Since the end plate portion is subjected to a considerable impact load when driving the pile, the end plate portion needs to be strong enough to withstand the impact. In addition, it is preferable to provide an appropriate deformation function by selecting an appropriate material, and an example of such a material is ductile cast iron.

(Claim 2) The recessed portion may have an axis perpendicular to the radiation, and the fastening plate may be perpendicular to the axis.
If it carries out like this, the recessed part of the pile which should be connected can be arrange | positioned on a straight line, and insertion of a volt | bolt becomes easy.

(Claim 3) The concave portion may be closed on the axis on the side opposite to the notch portion by a canopy portion.
If it carries out like this, when a ring is located in the head of a pile and it performs centrifugal molding, concrete will not leak outside through a recessed part.

(Claim 4) The fastening plate portion may have a concave portion that closely accommodates the washer, and the circumferential length of the wall surface of the concave portion may be a length that covers a range exceeding half of the circumferential length of the washer. .
By doing so, the position of the washer is specified only by being housed in the recess, and even if it receives an impact during driving of the pile, it does not come out of the notch, and the bolt and nut can be maintained in the fastening state.

(Claim 5) The recessed portion may have a rib on the outer peripheral surface.
If it carries out like this, when a big load is applied to the recessed part from the outside, the deformation | transformation can be prevented.

  According to the pile head ring according to the present invention, on the radiation passing through the center of the cylindrical body portion, a concave portion formed on the outer peripheral surface of the cylindrical body portion toward the center, and the bolt in the concave portion Since the shaft portion has a fastening plate portion having a notch portion that can be freely inserted and removed from the outside, it is not necessary to insert a bolt into the bolt insertion hole when connecting the pile, and the notch portion of the opposite pile head ring The fastening plate portions are integrated by inserting a bolt into the nut and screwing the nut into the bolt. Thereby, piles are mutually connected firmly.

  If the nut is screwed into the bolt in advance and the distance between the bolt head and the nut is set larger than the thickness of the two fastening plates, the bolt The head portion may be directed to one of the recessed portions, the nut may be directed to the other recessed portion, the shaft portion may be inserted into the cutout portion, and the bolts and nuts may be tightened. The work is very simple and the tightening force can be adjusted appropriately.

  FIG. 1 is a front view of a specific example of a pile head ring according to the present invention, and FIG. 2 is a plan view of FIG. FIG. 3 is a bottom view of FIG. 1 with the right half omitted, with the upper half shown in a non-fastened state and the lower half shown in a fastened state. FIG. 4 is an enlarged view of part A of FIG. FIG. 5 is a cross-sectional view taken along line 4-4 in FIG.

  The pile head ring according to the present invention includes an end plate portion 11, a cylindrical body portion 12 protruding from the outer peripheral edge portion of the end plate portion 11 in a direction perpendicular to the end plate portion 11, and a center c of the cylindrical body portion 12. A recess 13 formed on the outer peripheral surface of the cylindrical body 12 toward the center c on the radiation r passing through the center, and a notch in which the shaft 15 of the bolt 14 can enter and exit from the outside in the recess 13. A fastening plate portion 17 having 16 is provided.

  This pile head ring is formed by inserting the shaft portion 15 of the bolt 14 from the side into the notch portion 16 arranged on the same straight line of the opposing pile head ring, and screwing the nut 18 into the bolt 14 and tightening. The fastening plate portions 17 are integrated to connect the piles. Thereby, piles are mutually connected firmly. If the nut 18 is screwed in advance with the shaft portion 15 of the bolt 14 and the distance between the bolt head 31 and the nut 18 is set larger than the thickness of the two fastening plate portions 17, both fastening With the plate portion 17 in contact, the head portion 31 of the bolt 14 is directed to the one recessed portion 13, the nut 18 is directed to the other recessed portion 13, and the shaft portion 15 is inserted into the notched portion 16. Can be tightened. The work is very simple and the tightening force can be adjusted appropriately.

(Claim 2) The recessed portion 13 has an axis x perpendicular to the radiation r, and the fastening plate portion 17 is perpendicular to the axis x.
In this case, the recessed portions 13 of the piles to be connected can be arranged on a straight line, and the bolts 14 can be easily inserted.

(Claim 3) The recessed portion 13 is closed on the axis x by the canopy portion 19 on the side opposite to the notch portion 16.
In this case, when the pile head ring is arranged at a predetermined position and centrifugally molded, the concrete does not leak to the outside through the recessed portion 13.

(Claim 4) The fastening plate portion 17 has a concave portion 21 that closely accommodates the washer 20, and the circumferential length of the wall surface 22 of the concave portion 21 is a length that covers a range exceeding half of the circumferential length of the washer 20. ing.
In this case, the washer 20 does not come out of the notch 16 even if it receives an impact during the driving of the pile, so that the bolt 14 and the nut 18 can be kept in the fastened state.

(Claim 5) The recessed portion 13 includes a rib 23 on the outer peripheral surface.
In this case, when a large load is applied to the recessed portion 13 from the outside, the deformation can be prevented.

  In the drawings, reference numeral 31 denotes a locking hole for a PC steel rod as usual, which is composed of a large diameter portion for inserting the head of the PC steel rod and a small diameter portion for suppressing the head. 32 is a lacking portion for saving material in the case of a cast product.

It is a front view of the example of the pile head ring concerning this invention. In the plan view of FIG. 1, the upper half is omitted. In the cross-sectional view taken along the line 3-3 in FIG. 1, the upper half is omitted in the same manner as in FIG. It is the A section enlarged view of FIG. FIG. 5 is a sectional view taken along line 5-5 in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 End plate part 12 Cylindrical part 13 Recessed part c Center r Radiation 14 Bolt 15 Shaft part 16 Notch part 17 Fastening plate part 18 Nut 19 Canopy part 20 Washer 21 Recessed part 22 Wall surface 23 Rib 31 Locking hole 32 Filled part

Claims (5)

An end plate portion (11), a cylindrical body portion (12) protruding in a direction perpendicular to the end plate portion (11) from an outer peripheral edge portion of the end plate portion (11), and a center of the cylindrical body portion (12) A concave portion (13) formed toward the center on the outer peripheral surface of the cylindrical portion (12) on the radiation (r) passing through (c), and a bolt (14 ) Shaft portion (15) is provided with a fastening plate portion (17) having a notch portion (16) that is freely accessible from the outside, the notch portion (16) arranged on the same straight line of the opposite pile head ring A pile head ring characterized in that a bolt (14) is inserted into a bolt and tightened with a nut (18) so that the fastening plate portions (17) are integrated with each other to connect the piles together. The recessed portion (13) has an axis (x) perpendicular to the radiation (r), and the fastening plate (17) is perpendicular to the axis (x). Pile head ring as described in. The pile head ring according to claim 2, wherein the recessed portion (13) is closed on the axis (x) by the canopy portion (19) on the opposite side of the notched portion (16). The fastening plate portion (17) has a recess (21) that closely accommodates the washer (20), and the circumferential length of the wall surface (22) of the recess (21) is half of the circumferential length of the washer (20). The pile head ring according to claim 1, 2, or 3, wherein the pile head ring has a length that covers a range exceeding. The pile head ring according to claim 1, 2, 3, or 4, wherein the recessed portion (13) includes a rib (23) on an outer peripheral surface thereof.

Images