WO2011049174A1 - せん断キー構造 - Google Patents
せん断キー構造 Download PDFInfo
- Publication number
- WO2011049174A1 WO2011049174A1 PCT/JP2010/068612 JP2010068612W WO2011049174A1 WO 2011049174 A1 WO2011049174 A1 WO 2011049174A1 JP 2010068612 W JP2010068612 W JP 2010068612W WO 2011049174 A1 WO2011049174 A1 WO 2011049174A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shear key
- recess
- nut
- key structure
- joint material
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims description 72
- 230000002265 prevention Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 description 27
- 230000005540 biological transmission Effects 0.000 description 12
- 238000003780 insertion Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 7
- 238000005304 joining Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000755266 Kathetostoma giganteum Species 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
- F16B41/002—Measures against loss of bolts, nuts or pins
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
- F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
- F16B5/0241—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread with the possibility for the connection to absorb deformation, e.g. thermal or vibrational
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
- F16B7/18—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections using screw-thread elements
- F16B7/182—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections using screw-thread elements for coaxial connections of two rods or tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B3/00—Key-type connections; Keys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
- F16B37/14—Cap nuts; Nut caps or bolt caps
Definitions
- the present invention relates to a shearing key structure that is attached to prevent relative rotation around the axis of steel pipes when connecting the steel pipes, and is capable of suppressing loosening or falling off due to impact or vibration when constructing these steel pipes.
- steel pipes such as steel pipe piles and columns have been widely used in civil engineering or building structures.
- a columnar body steel pipe
- a method of connecting upper and lower steel pipes with a joint material has been adopted as an example of a longitudinal joining method.
- joint materials 102 and 105 are respectively attached to the lower end of the upper steel pipe 101 and the upper end of the lower steel pipe 104 by welding at a factory. Then, the upper and lower steel pipes 101 and 104 are connected by connecting the joint materials 102 and 105 with the load transmission key 107 at the site.
- a shear key (not shown) is usually placed on the joint 120 of the joints 102 and 105 and across both joints 102 and 105. ) Is attached.
- steel pipe piles are constructed by a striking method, a vibration method, a rotating method, a press-fitting method, or the like that applies striking, so that a large vibration or impact force acts on the steel pipe or joint material. Therefore, the bolt etc. used for the joint which connects the upper and lower steel pipes of the pile to be cascaded easily loosen, and the load may not be sufficiently transmitted to the joint portion. Further, the shear key attached to the peripheral surface (for example, the outer surface) of the joint portion may fall off when the bolt or nut to which the shear key is attached is loosened.
- Patent Document 1 discloses a columnar body having a detent mechanism for preventing relative rotation around the axis of a connected joint.
- Patent Document 2 discloses means for preventing loosening of a screw provided in a steel pipe joint.
- Patent Document 3 discloses a washer provided with an engagement protrusion in order to prevent a screw from loosening due to vibration.
- Patent Document 4 discloses a technique in which an elastic body is attached to a male screw and used as a locking member.
- Non-Patent Document 1 a disc spring and a nut with a toothed washer “SOLN” (registered trademark of Sanko Industry, Japan) as shown in Non-Patent Document 1, and Non-Patent Document 2 “Hard Lock Nut” (“Hard Rock” is a registered trademark of Hard Rock Industry Co., Ltd. in Japan) etc., which locks the wedge provided on the top surface of the nut as shown in FIG. It has been put into practical use.
- SOLN toothed washer
- the shear key since the member is usually provided with a predetermined clearance in consideration of a dimensional error at the time of manufacture or attachment, the shear key itself vibrates when a strong impact force is applied as in the striking construction. Therefore, in the conventional mechanism as described above, since the vibration of the shear key is transmitted to the nut or the like that fixes the shear key, it is not easy to sufficiently prevent the nut and the like from loosening. In addition, when bolts or the like are tightened to make it difficult to loosen, there is a problem that a load is directly applied to the bolts and they are easily damaged.
- An object of the present invention is to provide a shear key structure capable of suppressing loosening and dropping even when an impact, vibration, or the like is applied when constructing a steel pipe.
- a first aspect according to the present invention is a shear key structure for preventing relative rotation around the axis of a plurality of steel pipes when connecting a plurality of steel pipes in the longitudinal direction, and connecting the steel pipes.
- a screw fixed to the joint material to be connected a key body having a recess provided with a through-hole through which the screw passes, a nut that is screwed to the screw and disposed in the recess, and the nut And an elastic body provided in a gap between the outer periphery and the side wall of the recess.
- a shear key structure according to the first aspect, wherein the nut includes a toothed washer.
- the toothed washer allows the nut and the elastic body to mesh more firmly and prevent the nut from rotating.
- a third aspect according to the present invention is the shear key structure according to the first aspect, wherein an outer side of the nut which is an opening side of the recess is covered with an elastic cover having elasticity, and the elastic cover The outside is covered with a lid, and has a drop prevention means for preventing the lid from dropping from the recess.
- the nut is covered with the elastic cover having elasticity to absorb the vibration in the axial direction of the nut. Furthermore, since the lid body has a drop-off preventing means, the nut can be prevented from coming off.
- a shear key structure according to the third aspect, wherein the drop-off prevention means is a stop ring fitted in a groove formed in a side wall of the recess.
- the stop ring is fitted into the groove formed on the side wall of the recess, thereby suppressing the loosening of the nut and preventing the drop from the recess.
- the 5th aspect which concerns on this invention is the shear key structure which concerns on the said 1st, Comprising:
- the hollow part is formed in the said elastic body inside.
- the shear key structure the hollow portion is formed inside the elastic body, and the elastic body can be locally deformed by the resistance at the time of wearing. As a result, the elastic body can be attached with a small force.
- a sixth aspect according to the present invention is a shear key structure according to any one of the first to fifth aspects, wherein the side wall of the recess has an opening edge formed outward from the bottom. An inclined surface, and an inclined portion corresponding to the inclined surface is formed on the elastic body. According to the shear key structure, the contact between the elastic body and the side wall in mounting the elastic body is reduced. As a result, the elastic body can be attached with a small force.
- the elastic body absorbs the impact force acting on the steel pipe by the striking method or the like, so that the nut can be prevented from loosening and the shear key can be prevented from falling off.
- FIGS. 1A to 3F a first embodiment of the present invention will be described with reference to FIGS. 1A to 3F.
- FIG. 1A and FIG. 1B are perspective views showing an example of a joint material that longitudinally joins upper and lower steel pipes, with a part of the entire circumference cut away.
- a female box joint material 2 is attached to the lower end of the upper steel pipe 1 by being welded by a welding portion 3 in a factory.
- a male pin joint material 5 is attached to the upper end of the lower steel pipe 4 by being welded by a welding portion 6 in a factory.
- the box joint material 2 is provided with an arc-shaped load transmission key 7 that is appropriately divided over the entire circumference.
- the load transmission key 7 is fitted into the key groove 11 formed on the outer periphery of the pin joint material 5
- the box joint material 2 and the pin joint material 5 are coupled via the load transmission key 7, as shown in FIG. 1B.
- the upper and lower steel pipes 1 and 4 are mechanically connected in the vertical direction.
- the pin joint material 5 is formed in a cylindrical shape, and an insertion portion 13 having a smaller diameter than the cylindrical portion 12 is extended continuously to the cylindrical portion 12 having the same diameter as the outer diameter of the lower steel pipe 4.
- An engagement recess 14 into which the engagement protrusion 21 of the box joint material 2 is inserted is formed on the base end side of the outer periphery of the fitting insertion portion 13.
- An engaging convex portion 16 is provided at the tip of the fitting insertion portion 13 over the entire circumference.
- a key groove 11 into which the load transmission key 7 is fitted is provided on the outer periphery of the insertion portion 13 over the entire periphery.
- the box joint material 2 is formed in a cylindrical shape having an outer diameter substantially the same as the outer diameter of the upper steel pipe 1.
- the inner periphery of the box joint material 2 is a fitted insertion portion of the fitting insertion portion 13 of the pin joint material 5, and the engagement convex portion 21 is fitted into the engagement concave portion 14 of the pin joint material 5.
- an engagement recess 22 that engages with the engagement protrusion 16 of the pin joint material 5 is provided on the inner periphery of the base end side of the box joint material 2 over the entire circumference.
- screw holes 23 are provided on the outer periphery at appropriate intervals corresponding to the mounting position of the load transmission key 7. The screw hole 23 penetrates from the outside to the inside of the box joint material 2.
- both the box joint material 2 and the pin joint material 5 are provided at one place or at a plurality of places at appropriate circumferential intervals when the box joint material 2 and the pin joint material 5 are joined together.
- a recess 20a is provided to straddle.
- a shear key for preventing the box joint material 2 and the pin joint material 5 from rotating relatively is attached to the recess 20a.
- FIG. 2A and 2B show a method of joining the box joint material 2 and the pin joint material 5.
- a joint screw 8 and a load transmission key 7 are attached to the box joint material 2.
- a hexagon socket bolt is used as the joining screw 8 and is screwed into the screw hole 23 of the box joint material 2 shown in FIG. 1B.
- the engaging convex portion 21 of the box joint material 2 and the engaging concave portion 14 of the pin joint material 5, the engaging convex portion 16 of the pin joint material 5 and the engaging concave portion 22 of the box joint material 2 are provided.
- the box joint material 2 and the pin joint material 5 are positioned in the vertical direction, and the tip of the load transmission key 7 is disposed at the entrance of the key groove 11 of the pin joint material 5.
- the connecting screw 8 is rotated in the forward direction with a hexagon wrench 9 as shown in FIG. Advancing along, entering the keyway 11.
- the load transmission key 7 is disposed across both the box joint material 2 and the pin joint material 5.
- the box joint material 2 and the pin joint material 5 are coupled.
- the embedding depth of the joining screw 8 is measured from the outside of the box joint material 2 with a depth gauge or the like, and the load transmission key 7 is securely fitted in the key groove 11. Make sure.
- the shear key structure 10 is provided in the recess 20 a of the joint 20 of the box joint material 2 and the pin joint material 5.
- the screw 30 is locked in advance in a recess provided in the pin joint material 5 such that the tip of the screw 30 made of a hexagon socket bolt is protruded into the recess 20 a.
- a key body 31, a nut 35, and the like, which will be described later, are attached to the front end portion.
- the box joint material 2 and the pin joint material 5 that is, the upper and lower steel pipes 1 and 4 connected to each other. Prevents relative rotation around the axis.
- FIGS. 3A to 3F show attachment procedures (first to sixth steps).
- a plan view of the shear key structure 10 viewed from the tip side of the screw 30 is shown on the left side of the drawing, and a screw 30 is shown on the right side.
- the cross-sectional view which passes along the center of this and is orthogonal to the central axis of the joint member 5 is shown.
- the key body 31 is formed in a plate shape with a predetermined thickness that is substantially rectangular in plan view.
- the key body 31 has a circular recess 32 in plan view, and a bottom surface (bottom) 33 of the recess 32 has a through hole 34 formed in the center.
- the screw 30 is inserted into the through hole 34 so that the tip of the screw 30 protrudes into the recess 32.
- the base end side of the screw 30 is screwed into the pin joint material 5 as described above. As shown in FIG. 2C, in the shear key structure 10, the tip end portion of the screw 30 is passed through the through hole 34, and the key body 31 is disposed across both the upper and lower joint members 2 and 5.
- the recess 32 is positioned closer to the pin joint material 5 than the center in the vertical direction of the key body 31 so that the screw 30 is inserted through the through hole 34 in a state where the key body 31 straddles the joint materials 2 and 5. Is provided. In addition, as long as the screw 30 can be inserted through the through hole 34 in a state where the key body 31 straddles the joint members 2 and 5, the vertical position of the recess 32 in the key body 31 may be arbitrarily set.
- a nut 35 is screwed to the tip end side of the screw 30.
- the planar shape of the recess 32 of the key body 31 is slightly larger than the planar shape of the nut 35, and the depth of the recess 32 is slightly thicker than the thickness of the nut 35 in the rotation axis direction. Yes.
- the base end side of the nut 35 has a toothed washer. Further, by using a nut having both a toothed washer and a disc spring washer as in the above-described “Soroon” (registered trademark), the effect of preventing the nut from loosening is enhanced.
- the nut 35 is screwed onto the screw 30 until the washer of the nut 35 contacts the bottom surface 33 of the recess 32, and the nut 35 is disposed at the position shown in FIG. 3B.
- a solid band-shaped elastic body 38 having a cylindrical shape made of an elastic material such as rubber is wound around the nut 35 and attached to a gap 37 (FIG. 3B) between the side wall 36 of the recess 32 and the outer periphery of the nut 35.
- a gap 37 As shown in FIG. 3C, since the gap 37 is filled with the elastic body 38, when an impact force is applied during construction, the relative swinging of the key body 31 and the nut 35 is absorbed, and this elasticity The nut 35 is prevented from rotating by the frictional force generated between the side wall 36 and the nut 35 by the body 38. Further, the toothed washer of the nut 35 bites into the elastic body 38, thereby further reliably preventing the nut from rotating.
- the outer side of the nut 35 serving as the opening side of the concave portion 32 is covered with an elastic lid 39 having elasticity formed of rubber or the like as shown in FIG. 3D, and the outer side is further covered with a lid as shown in FIG. 3E. Cover with 40.
- the elastic lid 39 Since the elastic lid 39 has elasticity in the axial direction of the nut 35, the dimensional error of the position of the stop ring 41 fitted in the groove 42 is absorbed, and the head surface of the nut 35 and the lid body 40.
- the nut 35 By always filling the gap of the lower surface with an elastic body and maintaining the state of generating a repulsive force between the head surface of the nut 35 and the lower surface of the lid body 40, the nut 35 is axially driven by vibration during construction. This is preferable in that it can be prevented from shifting.
- the outer periphery of the nut 35 is surrounded and supported by the elastic body 38, and the outside of the nut 35 is pressed by the elastic lid 39, so that even if the key body 31 swings due to impact or vibration, it is transmitted to the nut 35. Absorbs vibration and prevents the nut 35 from rotating. Further, the nut 35 is prevented from coming off by covering the outside of the recess 32. Therefore, as shown in FIG. 2C, the shear key structure 10 provided in the recess 20a can reliably prevent the relative rotation of the upper and lower steel pipes 1 and 4 without being displaced or dropped by impact or vibration. .
- the shear key structure 50 according to the present embodiment is different from the shear key structure 10 according to the first embodiment in place of the elastic body 38 formed in a solid cylindrical band shape in the shear key structure 10.
- a cylindrical body having a hole 52 in the center of the cross section is an elastic body 51 having an annular hollow structure in which the central axis is annular, and the others are the same as those in the first embodiment, and therefore the same reference numerals are attached. Thus, the description is omitted.
- the elastic body 51 since the elastic body 51 has a hollow structure, local deformation is possible, and when there is a portion to which a large force is applied when the elastic body 51 is mounted, the portion is greatly deformed locally.
- the elastic body 51 can be attached to the gap 37 between the nut 35 and the side wall 36 with a small force. As a result, work efficiency can be improved.
- the shear key structure 60 according to the present embodiment is different from the shear key structure 10 according to the first embodiment in that the opening edge of the recess 32 is located outside the edge of the bottom surface 33, thereby
- the side wall 36A is an inclined surface that extends outward from the bottom surface 33.
- an annular elastic body 61 having a cross section corresponding to the outer periphery of the nut 35 and the inclined surface of the side wall 36A is used. . Since others are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.
- the elastic body 61 when the elastic body 61 is mounted in the gap 37 between the outer periphery of the nut 35 and the side wall 36A, the contact between the elastic body 61 and the side wall 36A is reduced, and the force required for mounting the elastic body is reduced. be able to. As a result, the elastic body 61 can be efficiently mounted.
- the structures of the box joint material and the pin joint material are not limited to those shown in FIGS. 1A and 1B.
- the shear key structure 10, 50, 60 was demonstrated about the case where the upper side steel pipe 1 and the lower side steel pipe 4 are connected via the box joint material 2 and the pin joint material 5, it is a hollow. You may apply to what the recessed part which comprises 20a was formed in either the upper steel pipe 1 and the lower steel pipe 4, or both.
- a synthetic rubber such as polybutadiene, nitrile, or chloroprene may be used in addition to rubber, and a three-dimensional network structure such as a sponge is provided. A porous body may be applied.
- wear wear.
- an elastic body having a structure other than these, or a known annular elastic body including an O-ring may be used.
- the elastic body 51 having a hollow structure in which the hole 52 is formed at the center of the cross section is used has been described.
- the hole (space) constituting the hollow structure is not at the center of the cross section. It is good also as a structure formed in the predetermined part in the predetermined part in the circumferential direction (longitudinal direction) of the elastic body 51.
- the configurations of the first to third embodiments and the above materials can be arbitrarily combined.
- the elastic cover 39 was covered with the elastic cover 39, and also the outer side was covered with the cover body 40, the elastic cover 39 and the cover body were demonstrated. It is good also as a structure which does not provide both 40, and it is good also as a structure which provides only the cover body 40, without providing the elastic cover 39.
- the screw 30 was set as the hexagon socket screw and the screw 30 was fixed by screwing the base end side in the pin joint material 5, for example, the base end side was demonstrated. May be fixed to the joint material by other means such as press fitting.
- a screw other than a hexagon wrench for example, a screw screwed in using a flathead screwdriver or a positive screwdriver may be used.
- the elastic body absorbs the impact and vibration acting on the steel pipe by the striking method and the like, and the nut can be prevented from loosening and falling off, thereby preventing the shear key from falling off.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
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Abstract
Description
本願は、2009年10月21日に、日本に出願された特願2009-242266号に基づき優先権を主張し、その内容をここに援用する。
これら鋼管を土木または建築構造物に用いる場合、製作および運搬等の都合から、定尺物の柱状体(鋼管)を現場に搬入し、現場で縦継ぎを行って所定の長さのものを形成する。縦継ぎ方法の一例として、近年、上下の鋼管を継手材によって連結する方法が採用されている。
そのため、縦継ぎされる杭の上下鋼管を連結している継手に用いられているボルト等が緩みやすく、接合部に十分に荷重が伝達されなくなることがある。また、接合部の周面(例えば、外側面)に取り付けられるせん断キーは、このせん断キーを取付けているボルトやナットが緩んだ場合には脱落する可能性がある。
また、例えば特許文献2には、鋼管の継手に設けたねじの緩みを防止する手段が開示されている。
また、例えば特許文献4には、雄ねじに弾性体を装着して、緩み止め部材として用いる技術が開示されている。
そのため、上記のような従来の機構では、せん断キーの振動がせん断キーを固定しているナット等に伝達されてしまうので、ナット等の緩みを十分に防ぐことは容易ではない。また、緩みにくくするためにボルト等を固く締め付けると、ボルトに直接荷重が作用し、破損しやすくなるという問題がある。
本発明に係る第1の態様は、複数本の鋼管をそれらの長手方向に連結する際に、これら鋼管同士の軸回りの相対回転を防止するせん断キー構造であって、前記各鋼管間を連結する継手材に固定されたねじと、底部に前記ねじを通す貫通孔を備えた凹部が形成されたキー本体と、前記ねじにねじ止めされて前記凹部内に配置されたナットと、前記ナットの外周と前記凹部の側壁との隙間に設けられた弾性体と、を備える。
上記せん断キー構造によれば、ナットの周辺を弾性体で囲んで弾性支持することで、せん断キーの揺動を吸収して、ナットの回転を抑えることができる。
上記せん断キー構造によれば、歯付き座金により、ナットと弾性体とがより強固に噛み合い、ナットの回転を防ぐことができる。
上記せん断キー構造によれば、ナットの外側を、弾性を有する弾性蓋で覆うことにより、ナットの軸線方向の振動を吸収する。さらに、蓋体は脱落防止手段を有しているので、ナットの抜け出しを防止することができる。
上記せん断キー構造によれば、凹部の側壁に形成された溝にストップリングをはめ込むことにより、ナットの緩みが抑制され、凹部からの脱落が防止される。
上記せん断キー構造によれば、弾性体の内部に中空部が形成されていて、弾性体が装着時の抵抗により局所的に変形可能とされる。その結果、小さな力で弾性体を装着することができる。
上記せん断キー構造によれば、弾性体装着における弾性体と側壁との接触が少なくなる。その結果、小さな力で弾性体を装着することができる。
図1Aに示すように、上側鋼管1の下端には、雌形のボックス継手材2が、工場において溶接部3で溶接されて取り付けられている。また、下側鋼管4の上端には、雄形のピン継手材5が、工場において溶接部6で溶接されて取り付けられている。
荷重伝達キー7が、ピン継手材5の外周に形成されたキー溝11にはめ込まれることにより、荷重伝達キー7を介してボックス継手材2とピン継手材5とが結合され、図1Bに示すように、上下の鋼管1、4が、縦方向に機械的に連結される。
図2Aに示すように、ボックス継手材2には、接合用ねじ8および荷重伝達キー7が取り付けられている。接合用ねじ8は、例えば六角穴付き植込みボルトが用いられ、図1Bに示すボックス継手材2のねじ孔23にねじ止めして取り付けられる。
せん断キー構造10は、例えば、六角穴付き植込みボルトからなるねじ30の先端が窪み20a内に突出するように、ピン継手材5に設けられた窪みに予めねじ30が係止され、そのねじ30の先端部に、後述するキー本体31やナット35等が取り付けられている。
また、キー本体31には、平面視円形の凹部32が形成され、凹部32の底面(底部)33には、中央に貫通孔34が形成されている。
また、図3Aに示すように、貫通孔34には、ねじ30が挿通されてねじ30の先端部が凹部32内に突出するようになっている。
ナット35の基端側は、歯付き座金を有している。また、前述の「ソルーン」(商標登録)のように、歯付き座金および皿ばね座金の両方を有するナットを用いることにより、ナットの緩み止め効果が高くなる。このナット35の座金が凹部32の底面33に当たるまでねじ30にねじ止めして、図3Bに示す位置にナット35を配置する。
また、第1から第3の実施形態の構成及び上記材質等を、任意に組合せ可能であることはいうまでもない。
また、六角穴付き植込みボルトに代えて、六角レンチ以外の工具、例えば、マイナスドライバやプラスドライバ等を用いてねじ込むねじを用いてもよい。
2 ボックス継手材
3、6 溶接部
4 下側鋼管
5 ピン継手材
7 荷重伝達キー
8 接合用ねじ
9 六角レンチ
10 せん断キー構造
11 キー溝
12 筒部
13 嵌挿部
14、22 係合凹部
16、21 係合凸部
20 継ぎ目
20a 窪み
23 ねじ孔
30 ねじ
31 キー本体
32 凹部
33 底面
34 貫通孔
35 ナット
36、36A 側壁
37 隙間
38、51、61 弾性体
39 弾性蓋
40 蓋体
41 ストップリング
42 溝
Claims (6)
- 複数本の鋼管をそれらの長手方向に連結する際に、これら鋼管同士の軸回りの相対回転を防止するせん断キー構造であって、
前記各鋼管間を連結する継手材に固定されたねじと、
底部に前記ねじを通す貫通孔を備えた凹部が形成されたキー本体と、
前記ねじにねじ止めされて前記凹部内に配置されたナットと、
前記ナットの外周と前記凹部の側壁との隙間に設けられた弾性体と、
を備えることを特徴とする、せん断キー構造。 - 前記ナットは、歯付き座金を備えていることを特徴とする、請求項1に記載の、せん断キー構造。
- 前記凹部の開口側である前記ナットの外側が、弾性を有する弾性蓋で覆われ、さらに前記弾性蓋の外側が蓋体で覆われているとともに、前記蓋体が前記凹部から脱落するのを防ぐ脱落防止手段を有していることを特徴とする、請求項1に記載のせん断キー構造。
- 前記脱落防止手段が、前記凹部の側壁に形成された溝にはめ込まれたストップリングであることを特徴とする、請求項3に記載のせん断キー構造。
- 前記弾性体の内部に、中空部が形成されていることを特徴とする、請求項1に記載のせん断キー構造。
- 前記凹部の側壁が、その開口縁が前記底部より外側に向かって形成された傾斜面であり;
前記弾性体に、前記傾斜面と対応する傾斜部が形成されている;
ことを特徴とする、請求項1から請求項5のいずれか1項に記載のせん断キー構造。
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JP2015086620A (ja) * | 2013-10-31 | 2015-05-07 | シントク工業株式会社 | 相対回動防止構造 |
WO2016103313A1 (ja) * | 2014-12-22 | 2016-06-30 | 新日鐵住金株式会社 | 鋼管杭の回転抑止構造 |
JP2017031590A (ja) * | 2015-07-30 | 2017-02-09 | 新日鐵住金株式会社 | 鋼管杭継手の回転抑止構造 |
JP2017044008A (ja) * | 2015-08-28 | 2017-03-02 | 新日鐵住金株式会社 | 鋼管杭継手の回転抑止構造 |
JP2018003431A (ja) * | 2016-07-01 | 2018-01-11 | Jfeスチール株式会社 | 逆回転防止機構を備えたネジ継手 |
JP2018123506A (ja) * | 2017-01-31 | 2018-08-09 | Jfeスチール株式会社 | 逆回転防止機構を備えたネジ継手 |
JP2018188928A (ja) * | 2017-05-11 | 2018-11-29 | 株式会社クボタ | 鋼管継手 |
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JP2017044008A (ja) * | 2015-08-28 | 2017-03-02 | 新日鐵住金株式会社 | 鋼管杭継手の回転抑止構造 |
JP2018003431A (ja) * | 2016-07-01 | 2018-01-11 | Jfeスチール株式会社 | 逆回転防止機構を備えたネジ継手 |
JP2018123506A (ja) * | 2017-01-31 | 2018-08-09 | Jfeスチール株式会社 | 逆回転防止機構を備えたネジ継手 |
JP2018188928A (ja) * | 2017-05-11 | 2018-11-29 | 株式会社クボタ | 鋼管継手 |
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