JP6243814B2 - Steel pipe pile joint structure - Google Patents

Description

  The present invention relates to a steel pipe pile joint structure for connecting a lower pile and an upper pile.

  Patent Document 1 (Japanese Patent Laid-Open No. 2001-64959) can be firmly gripped with a hydraulic machine or the like without damaging the upper end portion of the lower pile, and the lower end portion of the upper pile is screwed to the upper end portion of the lower pile. Providing steel pipe piles, lower piles and female threaded joint members that can easily attach female threaded joint members to the upper end of the lower pile main body pipe without damaging the lower pile head when connecting together The joint member attached to the upper end portion of the lower pile main body pipe fits inwardly of the upper end peripheral wall of the lower pile main body tube, and this cylindrical portion. It has an overhanging portion that is integrally connected to the upper end portion of the lower pile body and projects to the upper end surface side of the peripheral wall of the lower pile main body pipe, and is joined and integrated with the lower pile main body pipe by welding.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2001-64962) can solve the problem that occurs when the upper and lower piles are connected by field welding or a screw-type joint, and can reduce the mechanical burden on the bolt. Yes, the upper and lower piles can be firmly connected with a small number of bolts, and the joint between the lower and upper piles is prevented from overhanging outwards and smoothly penetrates into the ground. Steel piles with a structure that can be connected to the ends of the piles, connecting plates, and connecting the plates to the end plate or pile axis direction so that the plates are spaced with a predetermined size and spacing. Disclosed are joint members made of members having legs to be connected and bolted to upper and lower piles using these joint members.

  Patent Document 3 (Japanese Patent Application Laid-Open No. 2003-105755) is capable of easily connecting different diameter steel pipe piles with threaded joint members to shorten the construction time, without requiring advanced welding technology, and without being influenced by the weather. An upper screw provided at the upper end of the lower steel pipe pile that can be constructed and provides a joint structure between different diameter steel pipe piles that can exhibit stable joint performance that can transmit stress smoothly from the upper steel pipe pile to the lower steel pipe pile A fitting portion having an inner diameter larger than the outer diameter of the lower steel pipe pile is formed on the lower surface side of the joint member, and the lower steel pipe pile and the upper screw joint member are fitted in the fitting portion with the upper end portion of the lower steel pipe pile inserted. Is disclosed, and a joint structure is disclosed in which a male screw of a lower screw joint member provided at a lower end portion of an upper steel pipe pile is screwed and fastened to a female screw of an upper screw joint member.

  Patent Document 4 (Japanese Patent Application Laid-Open No. 2008-25156) provides a steel pipe pile with different diameters that can construct a head pile with excellent earthquake resistance by a rational and economical joining method. A pile material for connecting a pile material having a smaller diameter than the first pile portion having the same diameter that can be combined with the pile material having a large diameter, and a pile material having the same diameter that can be combined with the pile material having a small diameter. A first straight pipe portion and a second straight pipe portion are provided in a longitudinal center direction from each of the first end portion and the second end portion, and the first straight pipe portion is provided with the first straight pipe portion and the second straight pipe portion. Disclosed is a different-diameter steel pipe pile having a reduced diameter portion that decreases in diameter toward the straight pipe portion.

  When building on soft ground, pile foundations are generally used to support the building. In this case, since it is required to dig deeply, the lower steel pipe pile (lower pile) with a cutting blade, excavation claw, and spiral blade attached to the tip is rotated and propelled by a rotary drive device and installed on the ground. Furthermore, an upper steel pipe pile (upper pile) is connected to the upper part of this lower pile, and it is further rotated and propelled to install deeply in the ground.

  Steel pipe piles have a role to support the load of the superstructure over a long period of time and resist the load (horizontal force) applied to the steel pipe pile from the side in a portion near the ground that occurs in a relatively short time such as an earthquake. Have a role to play. Since this horizontal force becomes larger and deeper as it is closer to the ground surface, it is not necessary to form the entire steel pipe pile with the same cross-sectional area. For this reason, the structure close to the ground surface has a large projected area, and the part that receives vertical load only has to withstand compression and buckling. It is desirable in terms of cost to reduce the area.

  Patent Document 4 discloses a different diameter steel pipe pile for connecting a large-diameter pile material corresponding to this and a smaller-diameter pile material. However, as disclosed in Patent Document 1, after installing the lower pile on the ground, in order to weld the lower pile and the different diameter steel pipe pile, or the different diameter steel pipe pile and the upper pile in the field, There is a problem that it is difficult to weld with good quality in strong winds. Especially when welding different diameter steel pipe piles to the lower pile, and when welding upper piles to the upper end of the diameter steel pipe piles, it is necessary to hold the different diameter steel pipe piles or upper piles that are positioned above during welding However, there is a problem that accuracy control in the vertical direction (verticality) is difficult.

  In order to solve the above-mentioned problems, the present inventor is not limited to steel pipe piles having different diameters or the same type, and can improve the verticality at the time of joining and easily perform joining work (welding or bolt crimping). In order to provide a steel pipe pile joint structure that can be performed, the fixing mechanism used in the joint structure disclosed in Example 5 of Patent Document 5 (Japanese Patent Laid-Open No. 2013-234561) was invented.

  This fixing mechanism consists of a truncated cone-shaped top part fitted in a truncated cone-shaped lock hole formed through the upper pile and the lower pile at the joint part of the upper pile and the lower pile, and a fixed engagement with the piece. The fixing bolt is tightened by screwing the fixing bolt into the nut, so that the head of the fixing bolt is engaged with the mounting recess formed in the top portion, and the peripheral wall of the mounting recess protrudes outward. In this way, the top part is fixed to the lock hole. Thus, the above-described problem can be achieved.

JP 2001-64959 A JP 2001-64962 A JP 2003-105755 A JP 2008-25156 A JP 2013-234561 A

  However, the fixing mechanism described above has the effect that the joint can be constructed in a place where welding work cannot be performed, or where welding work is difficult, and the construction time can be shortened, Furthermore, it has the effect of being effective against the force in the direction of compression, extraction, and bending, but the peripheral wall of the mounting recess of the top part is deformed and closely contacts the lock hole. Had the problem of being difficult.

  For this reason, this invention is providing the steel pipe pile joint structure which comprises the fixing mechanism which has a detachable structure.

Accordingly, the present invention provides a lower steel pipe pile initially installed on the ground, an upper steel pipe pile connected to the upper end of the lower steel pipe pile, and a cylindrical shape integrally joined to the upper end of the lower steel pipe pile. of the inside cylinder is constituted by the outside cylinder fitted around the inside cylinder, the in steel pipe pile joint structure comprising a fixing mechanism for fixing the inside cylinder and the outside cylinder, the fixing mechanism: the outside A first mounting hole formed in a cylinder in a tapered shape and having a first opening that opens to the inner peripheral side of the outside cylinder and a second opening that opens to the outer peripheral side of the outside cylinder; A third opening that is tapered on the inside cylinder and opens to the inner circumferential side of the inside cylinder, and an outer circumference of the inside cylinder And a second mounting hole having a fourth opening that opens to the inner cylinder, and when the outside cylinder is mounted to the inside cylinder, gradually expands from the third opening toward the second opening. a lock hole to the diameter, and a small diameter end portion corresponding to the lock hole and the large diameter end portion and a truncated cone shape with the both ends, a tapered lock portion having a through hole penetrating in the axial direction, of the tapered lock portion An annular shape having an outer diameter substantially equal to the small-diameter end, and a taper wall formed so that the inner diameter becomes smaller toward the taper lock side is provided on the inner peripheral surface thereof. A first end having a first diameter in contact with the taper lock portion, and a second end having a second diameter on the opposite side of the first end, wherein the first diameter is and a small fixing washer portion than the second diameter, the fixing washer portion A third end having a third diameter larger than the first end and smaller than the second end; and a fourth end having a fourth diameter greater than the second end. and having a fitting washer portion having a tapered wall which is continuous from the third diameter to a fourth diameter, the tightening washer portion, in the through hole so as to penetrate the fixing washer portion and the taper lock portion A fixing bolt portion including a screw portion to be arranged and a head portion formed at one end of the screw portion and contacting the fixing washer portion; and a fixing bolt portion arranged on a large-diameter end outside the pile of the taper lock portion. The screw portion of the bolt portion is screwed to be configured by a nut portion that tightens the fixing bolt portion.

  With the above configuration, when an outside cylinder is mounted on the inside cylinder, a frustoconical lock hole is formed by the first and second through holes of the inside cylinder and the outside cylinder, and a fixed washer portion, The fixed washer part is inserted into the fixed washer part by inserting the fixed washer part and the taper lock part, fixing the fixing bolt part and rotating the nut part, and then tightening the washer part with the head of the fixing bolt part. Since the taper wall spreads outward and the outer peripheral surface of the fixed washer portion is fixed to the peripheral wall of the lock hole, the taper lock portion can be fixed to the lock hole. In addition, the inside cylinder and the outside cylinder can be fixed by the taper lock portion having a diameter larger than that of the conventional bolt, so that the rotation moment acting on the inside cylinder and the outside cylinder can be firmly fixed. is there.

  In addition, it is preferable that a rotation preventing portion for fixing rotation of the fixing bolt portion is formed at the other end portion of the screw portion of the fixing bolt portion.

Since the fixing bolt portion can be firmly fixed by the rotation holding portion, the nut portion can be easily rotated and the fixing bolt portion can be easily tightened. In addition, after the work, the lock prevention can be confirmed by cutting off and removing the anti-rotation portion.

  According to the invention of the present application, the lock hole having a truncated cone shape is formed when the outside cylinder is attached to the inside cylinder, and the tightening washer portion and the fixed washer portion are fixed together with the tapered lock portion of the truncated cone shape as the fixing means. Since the inside cylinder and outside cylinder are fixed by inserting into the lock hole, the joined part between the inside cylinder and outside cylinder can be secured by the taper lock part with a larger diameter than the bolt without increasing the diameter of the bolt. It is possible to obtain a sufficient holding force with respect to the rotational moment, compression force, pulling force, bending force, and the like applied to.

  As a result, the outside cylinder formed at the lower end of the upper steel pipe pile is fixed to the inside cylinder formed at the upper end of the lower steel pipe pile by external or internal fitting, so that the verticality at the time of joining is improved. It is possible to achieve the effects such as being able to be made, and being able to prevent the upper steel pipe pile from being overturned, and being able to increase the strength because of the double pipe structure.

It is explanatory drawing of the steel pipe pile joint structure which concerns on the Example of this invention, (a) is longitudinal direction sectional drawing, (b) is horizontal direction sectional drawing. It is explanatory drawing which showed the structure of the lock hole by which the fixing mechanism based on the Example of this invention is mounted | worn. It is a disassembled sectional view of the fixing mechanism which concerns on the Example of the fixing means of this invention. It is explanatory drawing explaining the mounting state of the fixing mechanism based on the Example of this invention, (a) is the elements on larger scale showing the state before mounting | wearing, (b) is the part which showed the state after mounting | wearing It is an expanded sectional view.

  Embodiments of the present invention will be described below with reference to the drawings.

  The steel pipe pile joint structure 1 which concerns on the Example of this invention is for fixing the upper steel pipe pile 4 to the lower steel pipe pile 2, as shown to Fig.1 (a). In this embodiment, the upper steel pipe pile 4 includes an upper pile portion 41 and an outside cylinder 5 that is fitted on the lower end portion of the upper pile portion 41. The upper pile portion 41 has a large-diameter portion having a large outer diameter and an inner diameter and a small-diameter portion having a small outer diameter and an inner diameter, even if the upper pile portion 41 has a cylindrical pile structure having a uniform outer diameter and inner diameter. It may be of an expanded tube structure. Further, a fixing mechanism 10 is provided to fix the upper steel pipe pile 4 to the lower steel pipe pile 2. Further, as shown in FIG. 1B, a plurality of the fixing mechanisms 10 are provided at the same interval in the circumferential direction of the overlapping portion of the outside cylinder 5 and the inside cylinder 6.

Further, as shown in Figure 2, the outside cylinder 5, the first mounting hole 7 which is formed in a tapered shape is formed, the first mounting hole 7, the inner circumference of the outside cylinder 5 1st opening part 71 opened to the side, and 2nd opening part 72 opened to the outer peripheral side of the outside cylinder 5 are comprised, Between the 1st opening part 71 and the 2nd opening part 72, it comprises. It is defined by the first tapered wall 73 that is continuously provided. Here, the diameter of the first opening 71 is smaller than the diameter of the second opening 72.

  The lower steel pipe pile 2 includes a lower pile portion 21 and an inside cylinder 6 that is welded and fixed to the upper end of the lower pile portion 21. The inside cylinder 6 has a second mounting hole 8 formed in a tapered shape. The second mounting hole 8 includes a third opening 81 that opens to the inner peripheral side of the inside cylinder 6 and a fourth opening 82 that opens to the outer peripheral side of the inside cylinder 6. It is defined by a second taper wall 83 that is continuous between the opening 81 and the fourth opening 82. Here, the diameter of the third opening 81 is smaller than the diameter of the fourth opening 82, and the diameter of the fourth opening 82 is equal to the diameter of the first opening 71.

  When the outside cylinder 5 of the upper steel pipe pile 4 is attached to the inside cylinder 6 of the lower steel pipe pile 2, the lock hole 9 is configured by the first attachment hole 7 and the second attachment hole 8. The lock hole 9 includes a second tapered wall 83 and a first tapered wall 73, and a second opening (large-diameter end outside the pile) 72 from a third opening (small-diameter end inside the pile) 82. It becomes a structure where the diameter is gradually expanded toward.

As shown in FIG. 3, the fixing mechanism 10 includes a taper lock portion 11 that is attached to the lock hole 9 and transmits a rotational moment acting on the upper steel pipe pile 4 to the lower steel pipe pile 2. A fixed washer portion 12 provided in contact with the small diameter end portion 11 b of the taper lock portion 11, a tightening washer portion 13 to be fastened to the fixed washer portion 12, a fixing bolt portion 14, and a nut portion 15. Further, it is constituted by a locking washer portion 16 disposed between the nut portion 15 and the taper lock portion 11.

  The taper lock portion 11 has a truncated cone shape similar to the lock hole 9, is formed to penetrate the center in the axial direction, and is provided with a through hole 11a through which the fixing bolt portion 14 passes. . The taper lock portion 11 includes a small-diameter end portion 11b located on the fixed washer portion 12 side and a large-diameter end portion 11c located on the opposite side.

The fixed washer portion 12 has an annular shape having an outer diameter substantially equal to that of the small-diameter end portion 11b of the taper lock portion 11, and the inner diameter of the fixed washer portion 12 decreases toward the taper lock portion side. The taper wall 12a formed in is provided. The tapered wall 12a of the fixed washer portion 12 has a first end portion 12b having a first diameter in contact with the taper lock portion 11 and a second end portion 12c having a second diameter opposite to the first end portion 12b. The first end 12b has a first diameter smaller than the second diameter of the second end 12c.

The tightening washer portion 13 has a substantially truncated cone shape, and a third diameter of the fixed washer portion side is larger than the first end portion 12b of the fixed washer portion 12 and smaller than the second end portion 12c. A third end portion 13c having a fourth end portion 13d opposite to the third end portion 13c. The fourth end portion 13d abuts against the head portion 14a of the fixing bolt portion 14, and The end portion 13d has a fourth diameter larger than that of the second end portion 12b. As described above, the peripheral wall of the tightening washer portion 13 has the tapered peripheral wall 13a continuous from the third diameter to the fourth diameter. In addition, a through hole 13b through which the fixing bolt portion 14 passes is formed in the center portion.

  As shown in FIG. 3, the fixing bolt portion 14 includes a head portion 14 a that contacts the tightening washer portion 13, a through-hole 13 b of the tightening washer portion 13, a fixed washer portion 12, and a taper lock portion 11. A screw portion 14b penetrating through the through hole 11a, and the screw portion 11 extends from the large-diameter end portion 11c of the taper lock portion 11 and is screwed into the nut portion 15 via a locking washer 16 It is. An anti-rotation portion 17 for preventing the fixing bolt portion 14 from rotating is formed at the end of the screw portion 14b. By holding the rotation preventing portion 17, the nut portion 15 can be easily rotated from the outside. The anti-rotation portion 17 is for confirming the locking of the lock, and is cut off and removed after the lock operation for tightening the nut portion 15 is completed.

  With the above configuration, when the fixing mechanism 10 is mounted, as shown in FIG. 4A, the taper lock portion 11 is mounted in the lock hole 9, and the fixed washer portion 12 and the tightening washer portion 13 are interposed. The fixing bolt portion 14 is mounted, the nut portion 15 is rotated to tighten the fixing bolt portion 14, and the tightening washer portion 13 is pushed toward the fixing washer portion 12 by the head portion 14a. Accordingly, since the peripheral wall of the fixed washer portion 12 spreads outward, the fixed washer portion 12 is fixed to the periphery of the lock hole 9, and the fixing mechanism 10 can be securely attached as shown in FIG. 4B. Is.

  Further, after the mounting, the rotation preventing portion 17 is cut off and removed so that the completion of the fixing work can be confirmed.

  Further, in the fixing mechanism 10 having the configuration of the present invention, the taper lock portion 11 can be removed from the lock hole 9 by removing the nut portion 15 from the fixing bolt portion 14, and therefore the upper steel pipe pile 4 and the lower steel pipe pile. 2 can be removed.

DESCRIPTION OF SYMBOLS 1 Steel pipe pile joint structure 2 Lower side steel pipe pile 4 Upper side steel pipe pile 5 Outside cylinder 6 Inside cylinder 7 1st mounting hole 8 2nd mounting hole 9 Lock hole 10 Fixing mechanism 11 Taper lock part 11a Through-hole 11b Small diameter end part 11c Large-diameter end portion 12 Fixed washer portion 12a Tapered wall portion 13 Tightened washer portion 13a Peripheral wall portion 13b Through hole 14 Fixing bolt portion 14a Head portion 14b Screw portion 15 Nut portion 16 Loosening washer portion 17 Anti-rotation portion

Claims (2)

A lower steel pipe pile initially installed on the ground, an upper steel pipe pile connected to the upper end of the lower steel pipe pile, a cylindrical inside cylinder integrally joined to the upper end of the lower steel pipe pile, In the steel pipe pile joint structure comprising an outside cylinder that fits outside the inside cylinder, and having a fixing mechanism that fixes the inside cylinder and the outside cylinder,
The fixing mechanism is :
A first mounting hole formed in a tapered shape in the outside cylinder and having a first opening that opens to the inner peripheral side of the outside cylinder and a second opening that opens to the outer peripheral side of the outside cylinder And a second mounting hole formed in the inside cylinder in a tapered shape and having a third opening that opens to the inner peripheral side of the inside cylinder and a fourth opening that opens to the outer peripheral side of the inside cylinder. A lock hole that gradually increases in diameter from the third opening toward the second opening when the outside cylinder is attached to the inside cylinder ;
A tapered lock portion having a truncated cone shape having a small-diameter end portion and a large- diameter end portion corresponding to the lock hole at both ends, and having a through-hole penetrating in the axial direction;
An annular shape having an outer diameter substantially equal to the small-diameter end of the taper lock portion is provided, and a taper wall formed so that the inner diameter becomes smaller toward the taper lock side is provided on the inner peripheral surface thereof. A taper wall having a first end having a first diameter in contact with the taper lock portion and a second end having a second diameter on the opposite side of the first end; A fixed washer portion having a first diameter smaller than the second diameter ;
A third end portion having a third diameter larger than the first end portion of the fixed washer portion and smaller than the second end portion, and a fourth end portion having a fourth diameter larger than the second end portion. A fitting washer having a tapered peripheral wall continuous from the third diameter to the fourth diameter, and having four end portions ;
The tightening washer unit, consisting of the fixing washer portion and the taper lock section head screw portion is disposed in the through hole so as to penetrate and is formed at one end of the threaded portion abuts the fixed washer portion Fixing bolt part,
A steel pipe pile joint comprising: a nut portion that is arranged at a large-diameter end on the outer side of the pile of the taper lock portion, and a screw portion of the fixing bolt portion is screwed to tighten the fixing bolt portion. Construction. The steel pipe according to claim 1, wherein a rotation preventing portion is formed at the other end portion of the screw portion of the fixing bolt portion so that the rotation of the fixing bolt portion can be fixed and cut off and eliminated. Pile joint structure.

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