JP2014025308A - Clamping device for covering plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamping device for a covering plate, capable of surely clamping adjacent covering plates to each other while avoiding the interference between the clamping devices thereof.SOLUTION: A clamping device for a covering plate comprises: a mounting bracket 21 attached to an underside 11 of the covering plate 10; a clamp 30 rotatably provided on the mounting bracket 21 via a support shaft 25; a nut 51 unrotatably and slidably engaged with the clamp 30; and an operation bolt 50 penetrating through the underside 11 of the covering plate 10 and the mounting bracket 21 and screwed in the nut 51. Rotary operation of the operation bolt 50 makes the clamp 30 vertically rotate around the support shaft, and the support shaft 25 is pivotally supported so as to slide along an inclined guide hole 26.

Description

  The present invention relates to a fastening device for a lining plate.

In various constructions involving road excavation, when laying a plurality of lining plates over the opening so that traffic is not hindered, the lining plates are received as a girder via a fastening device. It is fixed to prevent the lining board from dripping.
Various types of conventional fastening devices have been proposed.

Fastening devices of the type that use fastening bolts and nuts have bolt holes drilled in the upper flange of the lining plate and the receiving girder, respectively, and fasten between the lower surface of the lining plate placed on the receiving girder and the upper flange The lining plate is fixed to the receiving girder by tightening with bolts and nuts.
A fastening device of the type using a substantially L-shaped clip and a bolt and nut is provided with a bolt hole on the side of the lining plate and between the fastening bolt that penetrates the lower surface of the lining plate and the lower surface of the lining plate. After spanning the clip, the fastening bolt is tightened with a nut, and the free end of the clip is pressed against the lower surface of the lining plate to fix the lining plate to the receiving girder (Patent Document 1).

  The horizontal rotation type fastening device, in which the bolt is integrated with the horizontal part of the substantially L-shaped clip, is provided with a clip with bolts on the lower surface of the lining plate so that it can be rotated horizontally, and the clip is stored in the lining plate. After the lining plate is laid on the receiving girder in a state, the clip is rotated together with the bolt, so that the free end of the clip is inserted into the lower surface of the upper flange of the receiving girder (Patent Document 2). ).

  A fastening device of a type that uses the spring force of a coil spring is also known (Patent Documents 3 and 4).

JP-A-9-228305 (FIG. 11) JP-A-2-282504 (FIGS. 3 and 8) JP-A-7-332321 (FIGS. 1 and 2) JP-A-8-338003 (FIGS. 1 and 2)

The conventional lining plate fastening device has at least one of the following problems.
<1> Although the type using a fastening bolt and nut can obtain a high fastening force, an operator must enter the fastening plate under the lining plate and tighten the nut on the fastening bolt. The work scaffold must be assembled in advance, and workability is extremely poor.
<2> Originally, the fastening device exhibits the maximum fastening effect by placing it at the four corners closest to the corners of the lining plate, but if the clip rotates horizontally, the clip is around the fastening device. It is necessary to provide a space for rotation to avoid interference between the fastening devices of adjacent lining plates.
In response to the request for avoiding buffering, measures such as moving the position of the fastening device closer to the inside of the lining plate or shortening the clip length of the fastening device are taken, but none of the measures provide sufficient fastening force. There is a common problem such as.
Furthermore, if the clip is of a type that rotates horizontally, it cannot be confirmed from the upper surface side of the lining plate whether the clip positioned on the lower surface side of the lining plate rotates normally and can be set at the normal position of the receiving girder. There remains concern about the effectiveness of the fastening device.
Also, if the thickness of the upper flange is changed according to the size of the steel material that constitutes the girder, the clip will easily interfere with the end flange surface of the girder during rotation, which cannot be handled by one type of fastening device. .
<3> The type using the spring force is incomplete because the restoring force of the coil spring becomes the fastening force, and it is difficult to pressurize the coil spring evenly, resulting in variations in the fastening force and the lining plate There is a risk of causing a lateral shift.

  The present invention has been made in view of the above points. The object of the present invention is to avoid interference between the fastening devices of adjacent lining plates, and to securely fasten the lining plates. It is an object of the present invention to provide a fastening device for a lining plate that can be easily operated and unlocked from the upper surface side of the lining plate to improve workability and that the fastening is surely performed and the lateral displacement and the play are not generated. .

The invention of the present application is a fastening device for a covering plate that places a covering plate on the upper surface of the receiving beam and fixes the covering plate to the receiving beam, and a mounting bracket attached to the lower surface of the covering plate, A clamp provided rotatably on the mounting bracket via the shaft, a nut that is non-rotatable and slidably engaged with the clamp, and the bottom surface of the cover plate and the mounting bracket are threaded into the nut. The clamp is rotated up and down around the support shaft by the rotation operation of the operation bolt through the operation hole formed on the upper surface of the lining plate, and the support shaft is turned into the oblique guide hole. The support shaft is pivotally supported in a slant guide hole formed in the mounting bracket so as to slide along.
The clamp has a base portion penetrating the support shaft and an arm portion connected to the base portion, and an operation bolt is inserted into a notch formed in the bridging surface of the base portion so as to be slidably engaged with the bridging surface. The operation bolt is screwed to the combined nut.
A protrusion is formed at the upper end of the base of the clamp, and the clamp is configured to be rotatable with the protrusion as a fulcrum.

The present invention has at least one of the following effects.
<1> By rotating the operation bolt from the upper surface side of the lining plate, the lining plate can be easily fixed and released, and the workability can be greatly improved.
<2> Since the clamp rotates in the vertical direction around the support shaft, it does not come into contact with the end surface of the upper flange of the receiving girder and the lower surface of the upper flange can be securely gripped, so there is no backlash It becomes possible to fix securely with.
<3> Since the support shaft of the clamp is configured to be slidable along the oblique guide hole, smooth rotation of the clamp and fixing operation of the receiving beam by the clamp can be ensured. <4> Since the support shaft of the clamp is displaced along the oblique guide hole during the rotation of the clamp, it is possible to transmit the tightening force by the operation bolt as a large fastening force at the free end of the clamp, which is the point of action. .
<4> Since the clamp can be turned up and down with the projection of the clamp as a fulcrum, even if the thickness of the upper flange changes according to the steel material size that constitutes the receiving girder, only one type of fastening device can be used. Can respond.
<5> Since the clamp is configured to rotate up and down, a horizontal rotation space around the conventional fastening device is not required, and the clamps of the fastening devices of adjacent lining plates interfere with each other. There is nothing.
Since there is no restriction on the arrangement position of the fastening device with respect to the lining plate, the fastening device can be arranged at the four corner positions of the lining plate that can exhibit the maximum fastening effect, and a reliable fastening force can be obtained.

Sectional drawing of the corner | angular part of the lining board fixed to the receiving girder via the fastening apparatus which concerns on this invention Sectional view of II-II in FIG. Sectional view of the fastening device when unlocked Assembly drawing of fastening device Model diagram of fastening device

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

<1> Covering plate The corners of the covering plate 10 fixed to the upper flange 41 of the receiving girder 40 through the fastening device 20 attached to the covering plate 10 according to the present invention in FIGS. FIG. 3 shows a sectional view of the fastening device 20 at the time of unlocking, and FIG. 4 shows an exploded view of the fastening device 20.

The lining plate 10 is a plate body having a large bending rigidity in which a plurality of sections such as H steel are arranged in parallel, and adjacent portions of the adjacent section steels are welded to form a quadrangle.
On the upper surface 11 and the lower surface 12 of the lining plate 10, an operation hole 13 and an insertion hole 14 are formed at positions corresponding to the attachment position of the fastening device 20, respectively.
A cushioning material 15 made of a rubber pad or the like is fixed to the end of the lower surface 12 of the lining plate 10. The lining plate 10 can be brought into contact with the upper surface of the upper flange 41 of the receiving girder 40 via the cushioning material 15, and the cushioning material 15 functions to prevent noise and reduce the impact when the vehicle travels.

<2> Fastening device The fastening device 20 includes a mounting bracket 21 attached to the lower surface 11 of the cover plate 10, a clamp 30 provided on the mounting bracket 21 via the support shaft 25, a nut 51 engaged with the clamp 30, An operation bolt 50 that passes through the lower surface 12 of the lining plate 10 and the mounting bracket 21 and is screwed into the nut 51 is provided.
The nut 51 accommodated in the clamp 30 is not rotatable with respect to the clamp 30 and is slidable.
Hereinafter, each component of the fastening device 20 will be described in detail.

<2.1> Mounting Bracket The mounting bracket 21 is a bracket for providing the clamp 30 on the lower surface 11 of the lining plate 10, and is erected on one side of the substrate 22 and the substrate 22 attached to the lower surface 11 of the lining plate 10. It has a pair of side plates 23 and 23.
The substrate 22 is integrally fixed to the lower surface 12 by welding or the like in a state where the insertion hole 24 opened on the plate surface is aligned with the insertion hole 14 opened on the lower surface 12 of the lining plate 10.
In the plate surfaces of the pair of side plates 23, 23, an oblique guide hole 26 is formed which is slidable through the support shaft 25.
In this example, when the operation bolt 50 is rotated forward and backward, the support shaft 25 of the clamp 30 slides (moves) in both the horizontal and vertical directions so that the clamp 30 is allowed to rotate. A hole 26 is formed obliquely.
In other words, the oblique guide hole 26 is formed at an angle of about 45 degrees so that the center of swing of the clamp 30 moves in the up / down and front / rear direction (oblique direction) with respect to the mounting bracket 21.

<2.2> Clamp The clamp 30 is a vertically swinging rigid member that spans between the lower surface 12 of the lining plate 10 and the upper flange 41 of the receiving girder 40, and includes a base portion 31 that penetrates the support shaft 25, and a base portion 31. The arm portion 32 is integrally provided in a direction away from the arm 32 and can press the lower surface of the upper flange 41 of the receiving girder 40.

<2.2.1> Base The base 31 has a pair of side surfaces 31a and 31a and a bridging surface 31b formed integrally between the upper portions of the both side surfaces 31a and 31a.

  The pair of side surfaces 31a, 31a has a shaft hole 33 through which the support shaft 25 can be inserted at the lower portion thereof, and a projection 34 is formed at the upper end portion thereof.

The bridging surface 31b is formed with a notch 35 having a dimension that allows the operation bolt 50 to be inserted and prevents the nut 51 from passing therethrough. The bridging surface 31b that defines the notch 35 has both side surfaces 31a, It protrudes inward from the opposing surface of 31a.
The open end side on the right side of the bridging surface 31b is bent toward the approaching direction of the shaft hole 33, and the nut 51 disposed on the back surface of the bridging surface 31b can be moored.
The point is that the nut 51 disposed on the back surface of the bridging surface 31b allows the slide along the notch 35 and has an engagement structure that can maintain the engagement over the swinging section of the clamp 30.

<2.2.2> Arm part The arm part 32 is a part that transmits the load to the base part 31 from the free end of the clamp 30, and the total length thereof is a length that can contact the lower surface of the upper flange 41 of the receiving girder 40. It is set to.

<2.3> Operation Bolt and Nut The operation bolt 50 is a bolt for operating the swing of the clamp 30 and is inserted through the lower surface 12 of the cover plate 10 and the insertion holes 14 and 24 of the mounting bracket 21. The
In this example, a configuration in which a donut-shaped disc spring 52 is arranged under the neck of the operation bolt 50 is shown, but an elastic washer may be applied in addition to the disc spring 52.
The operation bolt 50 can be rotated by a rotary tool 60 such as a box wrench shown in FIG. 1 inserted into the operation hole 13 on the upper surface of the lining plate 10.

The nut 51 is non-rotatably accommodated inside the bridging surface 31b of the clamp 30, and can slide along the inner surface of the bridging surface 31b.
The reason why the nut 51 is slidable with respect to the clamp 30 is to allow smooth rotation of the clamp 30 around the support shaft 25 when the operation bolt 50 is rotated.
As the nut 51, for example, a space lock nut resistant to vibration and impact is suitable.

[How to use the fastening device]
Next, a method of using the fastening device 20 will be described.

<1> Laying of the lining plate FIG. 3 is a cross-sectional view of the fastening device 20 provided on the lining plate 10 immediately before laying on the receiving girder 40.
Before laying the lining plate 10, the nut 51 is screwed at a position near the end of the bolt shaft of the operation bolt 50, and the clamp 30 is suspended downward from the mounting bracket 21 by its own weight.
At this time, the support shaft 25 that pivotally supports the clamp 30 is positioned at the lowest position of the oblique guide hole 26, and the protrusion 34 formed at the end of the clamp 30 is separated below the substrate 22 of the mounting bracket 21. .
When the clamp 30 is in the suspended state, the distal end of the arm portion 32 does not interfere with the end portion of the upper flange 41 of the receiving girder 40.

With the clamp 30 of the fastening device 20 in the suspended state, the lining plate 10 is suspended toward the receiving girder 40 and placed on the upper surface of the upper flange 41.
Since the clamp 30 is positioned almost directly below the operation bolt 50, the covering plate 10 can be laid on the receiving beam 40 without the free end of the clamp 30 interfering with the upper flange 41 of the receiving beam 40.

<2> Fixing by Fastening Device Next, as shown in FIG. 1, the rotary tool 60 is inserted into the lining plate 10 through the operation hole 13, and the operation bolt 50 is rotated in the pulling direction of the nut 51.
As the operation bolt 50 rotates, the nut 51 engaged with the clamp 30 is pulled upward. As a result, the clamp 30 rotates about the support shaft 25 in the clockwise direction in FIG. The front end of the bracket approaches the lower surface of the upper flange 41 of the receiving girder 40.
During rotation of the clamp 30, the nut 51 slides along the bridging surface 31 b of the clamp 30, and the operation bolt 30 is displaced to the back side of the notch 35 following the sliding of the nut 51.

Further, during rotation of the clamp 30, the support shaft 25 slides along an oblique guide hole 26 that is inclined obliquely.
Since the support shaft 25 is configured to be slidable along the oblique guide hole 26, the slide along the bridging surface 31 b of the clamp 30 of the nut 51 is made smooth, and the clamp 30 is rotated around the support shaft 25. Smooth movement.

  As shown in FIG. 1, when the support shaft 25 reaches the uppermost position of the oblique guide hole 26, the projecting portion 34 of the clamp 30 comes into contact with the substrate 22 of the mounting bracket 21 and the top surface of the tip of the arm portion 32 of the clamp 30. Is brought into contact with the upper flange 41 of the receiving girder 40, whereby the rotation of the clamp 30 is stopped.

When the operation bolt 50 is further rotated and tightened, the projecting portion 34 of the clamp 30 is rotated about the fulcrum, and the arm portion 32 strongly presses against the lower surface of the upper flange 41 of the receiving girder 40 to complete the fastening.
The fastening force by the clamp 30 increases in proportion to the rotation of the operation bolt 50.

As described above, the operator simply rotates the fastening bolt 30 in the tightening direction from the upper surface side of the lining plate 10, so that the clamp 30 rotates upward and the upper flange 41 of the receiving girder 40 and the lining plate. 10 can be fastened.
Since the rotation of the clamp 30 is a vertical rotation about the horizontal support shaft 25, the free end of the clamp 30 does not collide with the end face of the upper flange 41 of the receiving girder 40, and the The lower surface of the flange 41 can be pressed.
Moreover, the operator changes the tightening force of the operation bolt 30 through the rotary tool 60 that the free end of the clamp 30 is in contact with the upper flange 41 of the receiving girder 40 on the upper surface 11 side of the lining plate 10. Can be accurately detected.

<3> Fastening force by fastening device The fastening force of the fastening device according to the present invention will be examined with reference to FIG.
In this figure, the contact point (fulcrum) between the protrusion 34 of the clamp 30 and the substrate 22 is P ₁ , and the contact point (force point) between the bridging surface 31b of the clamp 30 and the nut 51 screwed to the operation bolt 50 is P _2. The contact point (action point) between the free end of the arm portion 32 of the clamp 30 and the lower surface of the upper flange 41 of the receiving girder 40 is P _3, and the maximum length from P ₁ to P ₃ of the clamp 30 is L. The distance from 30 fulcrums to P ₂ to P ₁ is L _1, and the distance from P ₂ to P ₃ of the clamp 30 is L ₂ .
The fastening device 20 in the present invention constitutes a “lever” in the order of the action point, the force point, and the fulcrum from the left of the clamp 30.
Furthermore, when the clamp 30 is rotated to a substantially horizontal position, the entire clamp 30 together with the support shaft 25 moves in the backward direction to the right of the drawing.
From these facts, by rotating the clamp 30 to a substantially horizontal position, the position of the force point with respect to the clamp 30 is displaced to the action point side as compared to before the support shaft 25 is moved. That is, the distance L ₂ of the left half of the clamp 30 is short, the distance L ₁ of the right half is changed longer.
Therefore, it is possible to transmit the tightening force by the operation bolt 50 as a large fastening force at the free end of the arm portion 32 of the clamp 30 that is the operating point.

<4> When the receiving beam size is changed As shown in FIG. 5, the fastening device 20 according to the present invention can rotate the clamp 30 with the protrusion 34 at the right end of the clamp 30 serving as a fulcrum. Even if the thickness of the upper flange 41 is changed according to the size of the steel material constituting the girder 40, it can be dealt with by one type of fastening device 20.

<5> Fixing Release by Fastening Device To release the fixation with the receiving beam 40, an operation opposite to the fixing operation of the fastening device 20 described above is performed.
That is, the operation bolt 50 is rotated toward the separation direction of the nut 51 via the rotary tool 60 shown in FIG.
With the rotation of the operation bolt 50, the clamp 30 is rotated by its own weight about the support shaft 25 in the counterclockwise direction of FIG.

When the operation bolt 50 continues to rotate, the nut 51 slides along the bridging surface 31b of the clamp 30, and the operation bolt 30 is displaced toward the opening side of the notch 35 following the slide of the nut 51. 25 slides along the oblique guide hole 26 in the descending direction.
As shown in FIG. 3, when the support shaft 25 reaches the lowest position of the oblique guide hole 26, the clamp 30 hangs down to a position where it does not interfere with the end of the upper flange 41 of the receiving beam 40.
With the clamp 30 of the fastening device 20 in the suspended state, the lining plate 10 is lifted and removed from the receiving girder 40.

10 .. lining plate 11 .. upper surface of lining plate 12 .. lower surface of lining plate 13 .. operation hole 14 .. insertion hole 20. ... Fastening device 21 ... Mounting bracket 22 ... Substrate 24 ... Insertion hole 25 ... Support shaft 26 ... Oblique guide hole 30 ... · Clamp 31 ··· Clamp base portion 31a ··· Side surface 31b ··· Bridge surface 32 ··· Clamp arm portion 33 ··· Shaft hole 34 ··· Projection 35 ··· Notch 40 · · · Girder 41 · · · Upper flange 50 of the girder · · · Operation bolt 51 · · · Nut 52 · · · Disc spring 60 ... Rotary tool

Claims (3)

A lining plate fastening device for placing a lining plate on the upper surface of the receiving beam and fixing the lining plate to the receiving beam,
A mounting bracket attached to the lower surface of the lining plate,
A clamp rotatably provided on the mounting bracket via a horizontal support shaft;
A nut that is non-rotatable and slidably engaged with the clamp; and
An operation bolt that penetrates the lower surface of the lining plate and the mounting bracket and is screwed into the nut;
By rotating the operation bolt through the operation hole formed on the upper surface of the lining plate, the clamp rotates up and down around the support shaft, and the support shaft slides along the oblique guide hole. The support shaft is pivotally supported in an oblique guide hole formed in a mounting bracket,
Fastening device for lining plates.   The clamp has a base portion that penetrates the support shaft and an arm portion that is connected to the base portion, and an operation bolt is inserted into a notch formed in the bridging surface of the base portion so as to be slidably engaged with the bridging surface. The fastening device for a lining plate according to claim 1, wherein an operation bolt is screwed into the combined nut.   The fastening device for a lining plate according to claim 2, wherein a protrusion is formed at an upper end of the base of the clamp, and the clamp is configured to be rotatable with the protrusion as a fulcrum.

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