JP2014227737A - Fitting device of hanging bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting device of a hanging bolt, capable of preventing function from being deteriorated due to falling of the hanging bolt, the hanging bolt screwed to a fastening member being provided with locking means.SOLUTION: A fitting device of a hanging bolt includes: a ceramic insert 1 embedded in a concrete structure; a hanging bolt 2 having a predetermined length screwed to the ceramic insert; and a bolt stopper member 3 for locking the hanging bolt. After the hanging bolt is screwed to a female screw part 6 of a body through a sleeve 5 of the ceramic insert, a bolt stopper member formed of a soft synthetic resin is press-fitted between the sleeve and the hanging bolt to fasten the hanging bolt.

Description

  TECHNICAL FIELD The present invention relates to a mounting device for a suspension bolt that is screwed to a ceramic fixing member (hereinafter referred to as a ceramic insert) embedded in a concrete structure and is mounted in a suspended state and a loosened state. It is.

  A bolt attached to this type of suspension state is generally referred to as a suspension bolt, and a plurality of inventions are known as prior arts for the technology for preventing the suspension bolt from loosening. First, the first prior art includes a support block that is attached to the upper end portion of the movable panel and is connected to a male screw portion of a suspension bolt from a suspension vehicle, and a lock fitting that is detachably attached to the support block. The lock fitting is a suspension bolt locking device characterized in that the suspension bolt is restrained on the support block without rotation (Patent Document 1).

  The suspension bolt loosening prevention device configured as described above can support the movable panel movably suspended by a suspension vehicle via the suspension bolt by screwing and connecting the male thread portion of the suspension bolt. This is because the suspension bolt hangs down from the suspension vehicle, and the suspension vehicle is housed in a guide rail installed on the ceiling of the room, for example, so as to be movable. On the other hand, the lock fitting attached to the support block is capable of preventing the suspension bolt from rotating and preventing the suspension bolt from loosening by restraining the suspension bolt from rotating on the support block.

  Further, as a second related art that is publicly known, in a structure in which a moving wall is suspended from a suspension bolt that is suspended from a suspension vehicle that moves a ceiling rail, a socket in which a screw hole is formed is erected vertically at the upper end of the moving wall. Then, an engaging portion is provided on the side surface of the suspension bolt, and a washer having a through hole engaged with the engagement portion is fitted into the suspension bolt, and the suspension bolt is screwed into the screw hole of the socket. In addition, the washer is mounted on the upper end of the socket and locked so as not to rotate (Patent Document 2).

  The structure for suspending the moving wall constructed in this way prevents the suspension bolt from loosening via the washer, and the structure is very simple. That is, a washer having a hole that engages with an engaging portion formed on the side surface of the suspension bolt is fitted, and this washer is placed on the upper end of the socket, and the washer can rotate because it is engaged with the socket. Moreover, rotation of the suspension bolt engaged with the hole of the washer is also prevented. Therefore, the slack of the suspension bolt does not occur.

  Further, as a third prior art that is publicly known, a bolt is attached to a tunnel lining formed by inserting a number of hollow steel lining elements having a rectangular or cross-sectional shape into a natural ground prior to excavation of the natural ground. A bolt with a washer, a main bolt shaft that is screwed to the nut with the washer, and a temporary bolt shaft that is screwed to the nut with the washer. The part is formed by a dimensioned bolt that is screwed into the nut with washer, and a first fitting part is provided on the lower end surface of the tool to fit the tool. The temporary bolt shaft part is screwed into the nut with washer. A second fitting part is provided on the lower end surface of the tool to fit the tool, and the main bolt shaft part is fitted to the nut with washer, so that it is installed on the lining element. And the seat By screwing the temporary bolt shaft part to the attached nut, it becomes a temporary fixing bolt temporarily installed in the lining element, and the underwashing agent is applied to the entire area of the lower face part of the washer. The temporary fixing bolt is a suspension bolt set characterized in that the length of the lower part of the neck is substantially the same as the thickness of the steel material constituting the lining element (patent) Reference 3).

  The suspension bolt set configured in this way is configured such that the nut constituting the nut with the washer is a locking nut, and the main bolt and the shaft portion and the temporary bolt and the shaft portion screwed into the nut with the washer are It is prevented that the nut with a washer loosens and falls off.

Japanese Patent Laid-Open No. 2009-133060 Japanese Patent Laid-Open No. 2000-310084 Registered Utility Model Gazette of Utility Model Registration No. 3182672

  In the first prior art, a male screw portion is provided at the lower end portion of the suspension bolt, a prismatic portion is provided at the middle portion, a suspension wheel is provided at the upper end portion side of the suspension bolt, and from the guide rail via the suspension vehicle. It can be hung. Then, a lock fitting having a pair of protrusions that engage with the prismatic part of the suspension bolt is attached to the support block to which the male thread portion of the suspension bolt is screwed, and is suspended between the support block by the pair of protrusions. Since the rotation of the bolt is blocked and the support block itself is engaged with the groove portion of the frame material attached to the upper surface of the movable panel, the support block itself is not rotated, so it is attached not to the position where the suspension bolt is attached but to the suspension bolt. On the other hand, the loosening is prevented via the support block only for the object that only reciprocates (moving panel), and it cannot be applied at all when the suspension bolt is attached to the ceiling surface. Yes.

  In the second prior art, as in the first prior art, flat portions (engaging portions) are provided on both side surfaces of the suspension bolt, and a suspension wheel for moving the ceiling rail is provided at the upper end portion. And a moving wall is suspended from a suspension bolt that hangs down from the suspension wheel. Then, a socket with a screw hole is vertically installed at the upper end of the moving wall, and a washer with a through hole that engages with the engagement part of the suspension bolt is fitted into the suspension bolt and screwed into the screw hole of the socket. The washer is connected to the moving wall, and the washer is prevented from rotating by the locking piece or pin at the upper end of the socket. Since only loose objects (moving walls) are prevented from loosening via washers, there is a problem that they cannot be applied at all in a state where the suspension bolts are attached to the ceiling surface.

  Further, the third prior art is an invention of a suspension bolt set attached to a ceiling surface and a wall surface in tunnel construction or the like, and the suspension bolt set is screwed onto a nut with a washer and the nut with a washer. It is composed of a main bolt shaft portion formed of a dimensioned bolt and a temporary bolt shaft portion screwed into the washer-attached nut, and a washer-attached nut is embedded in the concrete ceiling surface and wall surface constituting the tunnel, The bolt shaft is screwed onto the washer nut and attached in a protruding state from the lining element, and the locking nut is screwed with the covering element sandwiched between the bolt shaft and the locking nut. The bolt shaft part is attached so that it does not rotate by tightening firmly toward the nut with washer. However, the nut with washer, the bolt shaft part, and the tightening nut Since There is metallic, it is of screwing fixation by mutual elastic or viscous resistance is satisfactorily performed.

  However, because the properties of the nut with washer and the concrete are completely different, there is no familiarity.In particular, since the coefficient of thermal expansion is different, the expansion and contraction of the metal is large in the winter and summer, so that the concrete side is easy to crack, Nuts with washers and suspension bolts embedded due to the penetration of moisture into the cracks corrode, and the occurrence of rust not only increases the cracks and causes concrete damage, but also destroys the function of the suspension bolts themselves. Will be.

  Therefore, in the prior art, the fixing member embedded in the concrete building is prevented from generating rust, and the hanging bolt screwed to the fixing member is provided with a locking means, so that A problem to be solved is to prevent the deterioration of the function due to dropping and to prevent the concrete from cracking due to the rust of the fixing member and the suspension bolt itself.

  The present invention provides, as specific means for solving the problems of the above-described conventional example, at least a ceramic insert embedded in a concrete structure, a suspension bolt of a required length screwed to the ceramic insert, and the suspension bolt The ceramic insert is formed integrally with a spherical main body having a female threaded portion formed therein and a cylindrical sleeve communicating with the female threaded portion. The suspension bolt of the required length is formed of a dimensioned bolt, and the bolt stopper member is formed of a soft synthetic resin in a cap shape with a flange portion and a conical cylinder portion, and the internal thread portion of the main body is passed through the sleeve of the ceramic insert. After fixing the suspension bolt to the screw, press the bolt stopper member between the sleeve and the suspension bolt and fix it. Is to provide a mounting device for hanging bolt is characterized in that so as to.

  In the present invention, the ceramic insert is made of high-purity alumina-based ceramics; and the bolt stopper member has a hardness of 48 (HDD) (JIS standard K7215) as additional requirements. .

  According to the suspension bolt mounting device of the present invention, since the fixing member embedded in the concrete structure is a ceramic ceramic insert, the compatibility with the concrete is good and rust is not generated. Not only has the excellent effect of preventing cracks, but the suspension bolt that is screwed onto the ceramic insert is pressed by inserting a bolt stopper member made of a soft synthetic resin between the sleeve and the suspension bolt. By fixing, there is an excellent effect that the suspension bolt is prevented from loosening.

It is the side view which isolate | separated the attachment apparatus of the suspension bolt which concerns on the form of embodiment of this invention, and showed one part in the cross section. It is a perspective view which shows the ceramic insert which is a fixing member based on the embodiment. It is a perspective view which shows the bolt stopper member which concerns on the same embodiment. It is sectional drawing which shows the state which attached the ceramic insert of the fixing member which concerns on the embodiment to the formwork. It is the side view which showed schematically the situation which attaches a suspension bolt to the ceramic insert embedded in the concrete structure in the embodiment, and showed a part in cross section. It is explanatory drawing which showed a part for demonstrating the condition for attaching the frame which supports a scaffolding board etc. to the suspension bolt attached in the same embodiment.

  A suspension bolt mounting apparatus according to the present invention will be described in detail based on the illustrated embodiment. In FIG. 1 to FIG. 3, the members constituting the suspension bolt attaching device are generally composed of at least a ceramic insert 1, a suspension bolt 2, and a bolt stopper member 3.

  The ceramic insert 1 is embedded in a concrete structure, is made of high-purity alumina-based ceramics, and has a head-shaped main body 4 and a cylindrical sleeve 5 formed integrally, as shown in FIG. Further, it has a substantially “kokeshi shape” as a whole, and an internal thread portion 6 is formed inside the head-shaped body 4, and a sleeve 5 communicates with the internal thread portion 6. Although the head-shaped main body 4 is formed in a spherical shape, a cutout portion 4a is provided in a part thereof to make it non-spherical so that it does not rotate in the embedded state.

  The suspension bolt 2 is a generally used cutting bolt having a required length, and a male screw portion 7 that is screwed into the female screw portion 6 of the main body 4 of the ceramic insert 1 is formed on the outer peripheral surface thereof. ing.

  The bolt stopper member 3 serves as a means for preventing the suspension bolt 2 from being loosened. For example, the bolt stopper member 3 is injection-molded with a soft synthetic resin (plastic) such as silicon, polyester, acrylic, or polyolefin. As shown in FIG. 3, it is formed in a cap shape as a whole, and comprises a lower flange portion 8 and a conical cylinder portion 9 protruding upward from the flange portion 8. The bolt stopper member 3 has a tensile elastic modulus as a product of 130 (MPa) (JIS standard K7161), a bending strength of 6.0 (MPa) (JIS standard K7171), and a bending elastic modulus (MPa) (JIS standard K7171). ), Durometer hardness (hardness) 48 (HDD) (JIS standard K7215), which is tough and does not break even when deformed.

  Further, the diameter of the flange portion 8 in the bolt stopper member 3 is formed so as to substantially match the outer diameter of the sleeve 5 of the ceramic insert 1, and the upper side 9 a of the outer diameter of the conical tube portion 9 is larger than the inner diameter of the sleeve 5. A small diameter (1 to 1.5 mm) is formed with a small diameter, and the lower side 9b is formed to be gradually inclined so as to be slightly larger (0.5 to 1.2 mm) than the inner diameter of the sleeve 5; The inner diameter of the conical cylinder portion 9 is formed to a diameter that substantially matches the outer diameter of the suspension bolt 2.

  In order to assemble a suspension bolt mounting apparatus using each member configured as described above, first, it is necessary to embed the ceramic insert 1 in a concrete structure. Therefore, as shown in FIG. 4, for example, a predetermined position of the formwork 10 for constructing an elevated line or a viaduct of a highway, for example, a plurality of gaps with a predetermined interval on a lower surface that becomes an edge of the viaduct. The ceramic insert 1 is disposed, and the threaded portion 11a of the hexagon bolt 11 is screwed onto the female threaded portion 6 of the main body 4 to be fixed. In this case, a rubber packing 12 or the like is interposed at the end of the sleeve 5 so that the concrete nodule does not enter the ceramic insert 1. The thickness of the rubber packing 12 to be used preferably corresponds approximately to the thickness of the flange portion 8 of the bolt stopper member 3.

  Then, after the cast concrete structure 13 is hardened, the hexagon bolt 11 is removed and the mold 10 is removed, and then, for example, a work scaffolding plate for constructing a protective wall is installed at the edge of the viaduct. In this case, the need for a stable suspension bolt arises. For this purpose, the tip of the suspension bolt 2 is connected to the female thread portion 6 of the main body 4 with the bolt stopper member 3 fitted to the suspension bolt 2 as shown in FIG. Next, the bolt stopper member 3 is forcibly pushed into the sleeve 5 by the cylindrical push-in member 14 so that the suspension bolt 2 is not rotated by vibrations or the like, that is, does not loosen. Installed in a state.

  In the suspension bolt mounting apparatus assembled in this way, as shown in FIG. 6, when the bolt stopper member 3 is pushed into the sleeve 5, the bolt stopper member 3 is elastic between the suspension bolt 2 and the sleeve 5. Since it deforms and contacts with a strong frictional force and the flange portion 8 fits into the recess from which the rubber packing 12 is removed, loosening of the suspension bolt 2 with the ceramic insert 1 is almost completely suppressed by the overall frictional resistance. It can be installed in a stable state.

  And, for example, a safe work scaffolding plate can be installed by attaching a frame 15 for attachment such as a scaffolding plate to the suspension bolt 2 via a nut 16 to the installed suspension bolt mounting device. is there. After the work is completed, the mounting frame 15 and the work scaffolding plate are removed, and then the suspension bolt 2 and the bolt stopper member 3 are removed from the ceramic insert 1 and, for example, a rubber cap or the like is fitted into the opening of the sleeve 5. Then, the ceramic insert 1 can be used as it is embedded in the concrete structure as it is, and the suspension bolt can be attached and used in the same manner as described above at the next use. In short, unlike metal, the ceramic insert 1 has not only rust, but also has almost the same properties as a concrete structure, so it can be integrated with concrete and used as long as the concrete structure exists. It can be done.

  By the way, when the screw part of the main body 4 of the ceramic insert 1 and the suspension bolt 2 are screwed together, if both of the threads and thread valleys are slightly deformed and do not fit, they are metal-to-metal. If it is forcibly screwed in, it can be screwed and connected without being damaged by mutual elasticity, but it cannot be forcibly screwed in ceramics and metal and cannot be screwed in forcibly. The function of the connection by the screw portion is substantially lost while the state remains incomplete. In order to avoid this, the pitch of the thread portion is the same, but the thread of the female thread portion 6 on the ceramic side is slightly lower and the thread valley is slightly deeper, thereby forming the male thread of the metal suspension bolt 2. A predetermined play length is obtained so that a required play (gap of about 2.0 to 5.0 μm = backlash) is generated in the screwing with the portion 7.

  In this way, when there is a play (gap of about 2.0 to 5.0 μmm) at the beginning of the screwing of the female screw part 6 and the male screw part 7, it is impossible to fix the connection by screwing the screw parts together. Yes, even if there is a little vibration, the suspension bolt 2 will gradually loosen, so it will not play a role at all. Therefore, after the male screw portion 7 on one end side of the suspension bolt 2 is screwed to the female screw portion 6 of the main body 4 in the ceramic insert 1, the bolt stopper member 3 is inserted into the gap between the sleeve 5 of the ceramic insert 1 and the suspension bolt 2. The bolt stopper member 3 is compressed and deformed by forcibly pushing it in, and is pressed against the inner wall of the sleeve 5, and is held in the thread valley of the suspension bolt 2 so as not to rotate (it is prevented from loosening). It is attached to the state.

  In any case, in the hanging bolt mounting device according to the present invention, the fixing member embedded in the concrete structure is made of a ceramic insert made of high-purity alumina ceramic, so that the compatibility with concrete is good. Moreover, since rust is not generated, not only can cracking of the concrete be prevented, but the suspension bolt can be used permanently as long as the concrete structure exists.

  The bolt stopper member made of soft synthetic resin has a hardness of 48 (HDD) (JIS standard K7215), so that it has moderate tensile strength and flexural elasticity, and is a support material. Since the phenomenon does not occur, the function of preventing the loosening of the suspension bolt is maintained for a long time.

  A suspension bolt mounting device according to the present invention includes at least a ceramic insert 1 embedded in a concrete structure, a suspension bolt 2 of a required length screwed to the ceramic insert 1, and a loosening prevention of the suspension bolt 2. The bolt stopper member 3 is configured to be attached to the female screw portion 6 of the main body 4 through the sleeve 5 of the ceramic insert 1 and then attached to the female screw portion 6, and then the bolt stopper member 3 is connected to the sleeve 5 and the suspension bolt 2. Since the suspension bolt 2 is prevented from loosening by being press-fitted in between, the fixing member embedded in the concrete structure is made of ceramic insert 1 made of ceramic, so that familiarity with concrete can be obtained. Since it has good properties and does not generate rust, it can not only prevent cracking of concrete, By using the bolt stopper member 3 formed of a synthetic resin quality, so locking the hanger rod 2 can be performed completely, it can be widely used in the attachment technique of this kind hanger rod.

DESCRIPTION OF SYMBOLS 1 Ceramic insert 2 Suspension bolt 3 Bolt stopper member 4 Main body 4a Notch part 5 Sleeve 6 Female thread part 7 Male thread part 8 Flange part 9 Conical cylinder part 9a Outer diameter upper side 9b Outer diameter lower end side 10 Formwork 11 Hexagon bolt 11a Screw Part 12 Rubber packing 13 Concrete structure 14 Pusher 15 Mounting frame 16 Nut

Claims (3)

At least a ceramic insert embedded in a concrete structure, a suspension bolt of a required length screwed to the ceramic insert, and a bolt stopper member for preventing the suspension bolt from being loosened,
The ceramic insert is integrally formed with a spherical main body having a female screw portion formed therein, and a cylindrical sleeve communicating with the female screw portion,
The suspension bolt of the required length is formed by a cut bolt,
The bolt stopper member is formed of a soft synthetic resin in a cap shape with a flange portion and a conical cylinder portion,
A suspension bolt characterized in that after the suspension bolt is screwed and attached to the female thread portion of the main body through the sleeve of the ceramic insert, the bolt stopper member is press-fitted and fixed between the sleeve and the suspension bolt. Mounting device. 2. The suspension bolt mounting apparatus according to claim 1, wherein the ceramic insert is made of high-purity alumina ceramics. 2. The suspension bolt mounting apparatus according to claim 1, wherein the bolt stopper member has a hardness of 48 (HDD) (JIS standard K7215).

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