JP5629396B1 - Lining plate fastening device - Google Patents

Abstract

The present invention provides a lining plate fastening device that can reduce interference with other members and increase fastening force to a receiving girder. A lining plate fastening device according to the present invention is a lining plate fastening device for fixing a lining plate placed on an upper portion of a receiving girder to a lower side of the lining plate. A hollow clamp with a horizontal guide hole parallel to the plate surface of the lining plate, and a hollow structure that is slidable and pivotally supported in the horizontal guide hole of the bracket via a horizontal support shaft And an elastic member that is disposed between the bracket and the clamp, and constantly urges the clamp in the protruding direction from the bracket, a nut that is non-rotatable and slidably engaged in the clamp, and a lining plate And an operation bolt that passes through the top and bottom surfaces of the bracket and is screwed into the nut, and a tip protrusion formed on the front end of the clamp so that the clamp protrudes from the front of the bracket when the operation bolt is pushed Formed on the front of the bracket Stopper and engaged thereby into the groove, characterized in that positioned in the bracket. [Selection] Figure 1

Description

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

The lining board is widely used for the purpose of covering the upper surface of the excavated part in road excavation work such as subway construction and underground piping work, and as a temporary gantry and pier floor board.
A plurality of lining plates are laid side by side on the upper part of a receiving girder such as H-shaped steel. At this time, various fastening devices are used to fix the lining plate to the receiving girder.

Patent Document 1 discloses a vertical rotation type fastening device having a fastening plate, a fastening bolt, a bearing member, a mounting shaft, a nut, an angle member, a stopper, and a guide member.
The fastening device bolts the fastening plate suspended by its own weight from the upper surface side of the lining plate, thereby rotating the fastening plate upward and fastening it to the receiving beam.

JP 2008-163687 A

In the conventional lining plate fastening device, when laying the lining plate, the fastening plate is not interfered with the receiving girder or the adjacent lining plate, so that the bolt is released and the fastening plate is suspended and hung on the receiving girder. It was down.
And after laying a lining board, the fastening plate was rotated upwards, and the lining board was fixed to the receiving girder.
Therefore, the conventional lining plate fastening device has the following drawbacks.
<1> It is easy to touch the rib at the time of fastening.
Since the conventional lining plate fastening device fixes the lining plate only by rotating the fastening plate upward, the rotation range of the fastening plate is large.
Therefore, the end of the fastening plate may come into contact with the rib of the receiving girder during fastening work.
<2> It is easy to touch other members when laying and removing.
In the conventional lining plate fastening device, the tip of the fastening plate hangs downward when the lining plate is laid or removed.
For this reason, the fastening plate is liable to come into contact with the receiving girder, the adjacent lining plate, etc., and is often damaged and difficult to work.
In addition, when stacking the lining plates after disassembly, the fastening plate may come into contact with the upper surface of the lower lining plate in the orthogonal direction, and the members and the lining plate may be damaged or the stacking position of the lining plate may be shifted. It was.
<3> The work efficiency of the fastening work is poor.
Since the conventional lining plate fastening device has a large rotation range of the fastening plate, the amount of movement of the nut required for fastening of the fastening plate is large.
Therefore, it took time to fasten and the work efficiency was very bad.
<4> The fastening force to the receiving girder is weak.
In the conventional lining plate fastening device, since the rotation range of the fastening plate is large, if the rear end portion of the fastening plate is lengthened, the rear end portion may come into contact with the bottom surface of the covering plate during rotation.
Therefore, the rear end of the member cannot be lengthened, and the distance from the bolt shaft to the fulcrum on the fastening plate rear end side is short.
For this reason, the axial force due to the fastening of the bolt is concentrated on the fulcrum on the rear end side of the fastening plate, and is not sufficiently transmitted to the fulcrum on the front end side, and the fastening force on the receiving beam is weak.
<5> Re-fastening after installation is not possible.
Conventional lining plate fastening devices can only fasten bolts from above the lining plate.
Therefore, even if loosening occurs after installation of the lining plate, if the upper surface of the lining plate is covered with pavement, the operation hole for inserting the rotary tool is buried, and the bolt can be retightened. There wasn't.

An object of the present invention is to provide a lining plate fastening device having at least one of the following effects.
<1> The interference with other members can be reduced and the fastening force to the receiving girder can be increased.
<2> Excellent workability in fastening work.
<3> Able to retighten after fastening.
<4> The nut should not drop when fastening is released.

  The lining plate fastening device of the present invention for solving the above problems is a lining plate fastening device for fixing a lining plate placed on the upper portion of the receiving girder, Attached to the lower surface of the lining plate and slidable and rotatable in the horizontal guide hole of the bracket via a horizontal support shaft and a bracket having a horizontal guide hole parallel to the plate surface of the lining plate A hollow structure clamp that is pivotally supported, and an elastic member that is arranged between the bracket and the clamp, and constantly urges the clamp in the protruding direction from the bracket. And an operation bolt that passes through the upper and lower surfaces of the lining plate and the bracket and is screwed to the nut, and the front end of the clamp is protruded from the front portion of the bracket by pushing the operation bolt. The tip protrusion formed on the Tsu bets of engaged thereby to form the stopper grooves on the front, characterized by being positioned within the bracket.

  The lining plate fastening device of the present invention is characterized by having a protruding rotation stopper at the rear end of the clamp.

  The lining plate fastening apparatus of the present invention has an insertion port for inserting a nut into the inside of the clamp at the rear part of the clamp.

  The lining plate fastening device of the present invention is characterized in that the elastic member is a tension spring.

  The lining plate fastening apparatus of the present invention further includes a refastening nut, and is characterized in that the refastening nut is screwed onto an operation bolt having the clamp penetrated to fasten the clamp.

Since the lining plate fastening apparatus of the present invention has the above-described configuration, it has at least one of the following effects.
<1> The clamp does not touch the rib when fastening.
In the lining plate fastening device of the present invention, first, the tip of the clamp is positioned at an intermediate position between the upper flange and the rib by sliding the clamp (FIG. 5), and then rotated upward and fastened (FIG. 6). ).
Moreover, the position of the protruding clamp tip can be arbitrarily set by the temporary fixing position of the nut.
For this reason, a clamp does not touch a rib at the time of fastening.
<2> Difficult to touch other members when laying and removing.
In the lining plate fastening device of the present invention, the clamp is accommodated inside the bracket when the lining plate is laid (FIG. 4).
For this reason, the tip of the clamp is unlikely to come into contact with the receiving girder, the adjacent lining plate or the like, and the installation work is easy. Furthermore, there is little damage of the member by a conflict.
In addition, even when the bolt fastening of the clamp is released when the lining plate is removed, the clamp does not hang down because the rotation stopper at the rear of the clamp comes into contact with the top plate of the bracket.
Therefore, when stacking the lining plates after disassembly, even if the tip of the clamp touches the upper surface of the lower lining plate, the clamp rotates upward about the support shaft. The work board is not damaged and the stacking position of the lining board is not shifted.
<3> The work efficiency of the fastening work is high.
In the lining plate fastening device of the present invention, after the clamp is slid and positioned, the tip of the clamp is rotated upward to fasten it.
Therefore, the clamp rotation range is small, and the clamp can be fastened with a small amount of rotation.
Therefore, the work time required for fastening is short and the work efficiency is very good.
<4> Strong fastening force to the receiving girder.
Since the lining plate fastening apparatus of the present invention fastens the clamp by a combination of slide and vertical rotation, the rotation range of the clamp is small, and there are few spatial restrictions at the rear end of the clamp. Therefore, the rear end portion of the clamp can be designed long.
By making the rear end of the clamp longer, the distance from the bolt shaft to the fulcrum on the clamp rear end side also becomes longer, so that the axial force due to fastening of the operation bolt can be sufficiently transmitted to the fulcrum on the clamp front end side. (FIG. 2).
Therefore, the fastening force to the receiving girder is strong.
<5> It can be re-fastened after the lining plate is installed.
In the lining plate fastening device of the present invention, the tip of the operation bolt projects from the lower groove of the clamp.
Therefore, even after paving the upper surface of the lining plate, the loosened operation bolt can be tightened again from below (FIG. 7).
<6> The nut does not fall during disassembly.
Since the nut is accommodated in the inner space of the clamp in the lining plate fastening device of the present invention, the nut remains at the tip of the inner space and does not fall outside even if the fastening of the operation bolt is released.

Explanatory drawing of the lining board fastening apparatus which concerns on this invention. Explanatory drawing of the lining board fastening apparatus which concerns on this invention. Sectional drawing of III-III in FIG. Explanatory drawing of the 1st Example of the lining board fastening apparatus which concerns on this invention. Explanatory drawing of the 1st Example of the lining board fastening apparatus which concerns on this invention. Explanatory drawing of the 1st Example of the lining board fastening apparatus which concerns on this invention. Explanatory drawing of the 3rd Example of the lining board fastening apparatus which concerns on this invention.

Hereinafter, the lining plate fastening apparatus of the present invention will be described in detail with reference to the drawings.
In the description, the sliding direction of the clamp 20 is the front-rear direction, and the protruding side of the clamp 20, that is, the receiving beam 60 side in a state where the lining plate fastening device is installed on the lining plate 50 is “front”, and the opposite side is “rear”. "
The lower surface 52 of the lining plate 50 is provided with an insertion hole 54 for fastening the lining plate fastening device with a bolt.
An operation hole 53 for operating a rotary tool 70 such as an impact wrench is provided on the upper surface 51 of the lining plate 50. The operation hole 53 is provided above the insertion hole 54.

[Configuration of the present invention]
<1> Overall configuration.
Please refer to FIG. The lining plate fastening device of the present invention includes a bracket 10, a clamp 20, an elastic member 30, an operation bolt 40, and a nut 41.
The clamp 20 protruding from the bracket 10 is fastened by the operation bolt 40 inserted from above the cover plate 50 and the nut 41 accommodated in the internal space 21 of the clamp 20, whereby the cover plate 50 is received by the receiving beam 60. To fix.
The state in which the clamp 20 is held inside the bracket 10 is referred to as “stored state” (FIG. 4), and the state in which the tip of the clamp 20 protrudes from the bracket 10 is referred to as “deployed state” (FIG. 5).

<2> Bracket.
The bracket 10 is a member that houses the clamp 20 therein.
The bracket 10 includes a top plate 11 that is welded to the lower surface 52 of the cover plate 50 when attached to the cover plate 50, and a pair of side plates 12 and 12 that are erected downward from the left and right ends of the top plate 11.
A bolt hole 16 for inserting the operation bolt 40 from above is provided at the front center portion of the top plate 11.

<2.1> Side plate.
The pair of side plates 12 and 12 are plate-like portions extending downward from the left and right ends of the top plate 11.
In this example, the side plate 12 has a reverse kamaboko shape in which two corners on the extending side are curved. Since there is no corner on the extending side, the side plate 12 is unlikely to interfere with the receiving beam 60, the adjacent lining plate 50, or the like when the lining plate 50 is installed or transported.
Note that the shape of the side plate 12 is not limited to this, and may be a polygonal shape in which, for example, the corners on the extending side are cut off in a straight line.
The plate surfaces of the pair of side plates 12 and 12 have a horizontal guide hole 13 through which the support shaft 26 is inserted to slide the clamp 20 in the horizontal direction.
A notch 15 for connecting the elastic member 30 is provided on the upper front end of the pair of side plates 12, 12. However, the elastic member 30 can also be connected by other known connection methods.

<2.2> Stopper groove.
The stopper grooves 14 and 14 are grooves for positioning the clamp 20 in the bracket 10 in cooperation with the tip protrusion 25 at the front end of the clamp 20.
The stopper grooves 14 and 14 are formed from the lower part of the front end of the side plates 12 and 12 toward the top plate 11.
The clamp 20 is urged by elastic members 30 and 30 described later so that the tip protrudes from the bracket 10.
Therefore, the clamp 20 can be held in the bracket 10 by pushing the clamp 20 backward in the bracket 10 and hooking the tip protrusion 25 of the clamp 20 in the stopper grooves 14 and 14.
On the other hand, when the clamp 20 is unfolded, the front end of the clamp 20 is pushed downward by the operation bolt 40, so that the tip protrusion 25 is detached from the notches of the stopper grooves 14, 14, and the clamp 20 is pulled by tension of the elastic members 30, 30. Protrudes out of the bracket 10.

<3> Clamp.
The clamp 20 is a member that transmits an axial force generated by bolt fastening to the upper flange 61 of the receiving beam 60 and fixes the cover plate 50 to the receiving beam 60.
The width of the clamp 20 corresponds to the width between the side plates 12 and 12 of the bracket 10.
The clamp 20 has a front contact portion 28 on the upper surface of the front end.
The clamp 20 has a rear contact portion 29 on the upper surface of the rear end.
An internal space 21 is provided inside the clamp 20.
The clamp 20 has an opening 22 at the rear part of the upper surface.
As for the clamp 20, the rotation stopper 27 protrudes from the rear end.

<3.1> Internal space.
The internal space 21 is a space that is provided inside the clamp 20 and slidably accommodates the nut 41 (FIG. 2).
The internal space 21 is formed from the front end portion to the rear end portion of the clamp 20 along the longitudinal direction of the clamp 20, and both front and rear ends are closed.
The inner space 21 has such a width that the nut 41 it can hold cannot rotate and the nut 41 can slide. That is, the width of the internal space 21 is larger than the minimum width of the nut 41 and smaller than the maximum width (FIG. 3).
An upper groove 23 and a lower groove 24 are provided in the upper and lower portions of the internal space 21, respectively.

<3.2> Opening.
The opening 22 is a space for inserting the nut 41 into the internal space 21.
The opening 22 is provided from the rear part of the upper surface of the clamp 20 to the upper part of the rear end. The front end of the opening 22 communicates with the rear end of the upper groove 23.

<3.3> Upper groove.
The upper groove 23 is a groove provided on the upper surface of the clamp 20 along the longitudinal direction of the clamp 20. The upper groove 23 communicates with the internal space 21.
The width of the upper groove 23 is larger than the shaft diameter of the operation bolt 40 and smaller than the minimum width of the nut 41.

<3.4> Lower groove.
The lower groove 24 is a groove provided on the lower surface of the clamp 20 along the longitudinal direction of the clamp 20. The lower groove 24 communicates with the internal space 21.
The width of the lower groove 24 is larger than the shaft diameter of the operation bolt 40 and smaller than the minimum width of the nut 41.

<3.5> Tip projection.
The tip protrusion 25 is a part for holding the clamp 20 in the bracket 10 in cooperation with the stopper groove 14 at the front part of the bracket 10.
The tip protrusion 25 is a columnar portion protruding left and right from the front end of the clamp 20.
By engaging the tip protrusion 25 with the stopper groove 14 of the bracket 10, the tip of the clamp 20 urged by the elastic member 30 to protrude outside the bracket 10 is held in the bracket 10.
The lining plate fastening apparatus of the present invention can house the clamp 20 in the bracket 10 while being biased so as to protrude in the horizontal direction by combining the tip protrusion 25 and the stopper groove 14.

<3.6> Support shaft.
The support shaft 26 is a part for connecting the clamp 20 to the bracket 10 so as to be rotatable and sliding the clamp 20 along the horizontal guide hole 13.
In this example, the support shaft 26 employs a steel rod inserted in the left-right direction through a through-hole provided in the side surface of the rear portion of the clamp 20.
With the clamp 20 inserted into the bracket 10, the support shaft 26 is inserted into the clamp 20 through the horizontal guide hole 13 of the bracket 10, and the left and right ends are projected from the horizontal guide hole 13.
The lining plate fastening device of the present invention can simultaneously perform horizontal movement and vertical rotation of the clamp 20 by combining the horizontal guide hole 13 and the support shaft 26.

<3.7> Front contact portion and rear contact portion.
The front abutting portion 28 is a portion that transmits an axial force generated by fastening of the operation bolt 40 to the lower surface of the upper flange 61 of the receiving beam 60.
The front abutting portion 28 is formed on the upper surface of the front end of the clamp 20 so as to protrude upward.
The rear contact portion 29 is a portion that transmits an axial force generated by fastening of the operation bolt 40 to the top plate 11 in the bracket 10.
The rear contact portion 29 is formed on the upper surface of the rear end of the clamp 20 so as to protrude upward.

<4> Elastic member.
The elastic member 30 is a member that connects the bracket 10 and the clamp 20 and biases the clamp 20 in the protruding direction.
In this example, the elastic member 30 employs a pair of tension coil springs.
One end of each of the elastic members 30, 30 is hooked on the notches 15, 15 of the side plate 12, and the other end is stretched over and connected to the support shaft 26 of the clamp 20.
The type and connection method of the elastic member 30 are not limited to the above, and other known members and connection methods may be employed. For example, a tension coil spring can be provided only on one side of the bracket 10.

<5> Operation bolt.
The operation bolt 40 is a member that deploys the lining plate fastening device by fastening the clamp 20 to the receiving beam 60 in cooperation with the nut 41 and pushing down the bolt head.
A washer 42 is interposed in the operation bolt 40, communicates with the insertion hole 54 and the bolt hole 16 of the bracket 10 from above the cover plate 50, and is screwed into the nut 41 in the internal space 21.

<6> Assembly of the lining plate fastening device.
The lining plate fastening device of the present invention is assembled by the following procedure.
The bracket 10 is welded to the lower surface of the lining plate 50, the operation bolt 40 is inserted from above the lining plate 50, and the nut 41 is temporarily fixed to the tip.
The clamp 20 is lifted in the vertical direction from below the operation bolt 40, and the nut 41 at the tip of the operation bolt 40 is inserted into the opening 22.
The clamp 20 is slid rearward in the horizontal direction, and the nut 41 is positioned in front of the internal space 21.
The support shaft 26 is inserted into the hole on the side surface of the clamp 20 through the horizontal slide hole 13 of the bracket 10.
One end of the pair of elastic members 30, 30 is hung on the notches 15, 15 of the bracket 10, and the other end is hung on both ends of the support shaft 26.
At the same time as the clamp 20 is pushed backward in the bracket 10, the front end of the clamp 20 is rotated upward, and the tip protrusion 25 is locked in the stopper groove 14.
The assembled cover plate fastening device is locked in the bracket 10 while being urged so that the tip of the clamp 20 protrudes from the bracket 10 (FIG. 4).

[Fastening method of lining plate]
Next, a method for fastening a lining plate by the lining plate fastening device of the present invention will be described with reference to the drawings.

<1> Placement of lining plate.
The lining plate 50 provided with the lining plate fastening device on the lower surface is hung on the upper flange 61 of the receiving girder 60.
In the lining plate fastening device of the present invention, since the clamp 20 is accommodated inside the bracket 10, when the lining plate 50 is placed, the tip of the clamp 20 is attached to the receiving girder 60, the adjacent lining plate 50, or the like. Hard to interfere.

<2> Deployment of the clamp.
In the storage state, the head of the operation bolt 40 protrudes upward from the insertion hole 54 (FIG. 4).
A rotary tool 70 such as an impact wrench is inserted through the operation hole 53 of the lining plate 50, and the head of the operation bolt 40 is pushed down (FIG. 5).
Since the nut 41 is temporarily fixed to the tip of the operation bolt 40, when the operation bolt 40 is pushed down, the lower surface of the nut 41 presses the upper surfaces of the left and right end portions of the lower groove 24 and pushes down the clamp 20 downward.
The pressed clamp 20 rotates downward about the support shaft 26, and the tip protrusion 25 at the front end of the clamp 20 is released downward from the stopper groove 14.
When the tip protrusion 25 is released, the support shaft 26 slides forward along the horizontal guide hole 13 due to the tensile force of the elastic member 30, and the front end of the clamp 20 rotates downward along the nut 41. The clamp 20 protrudes obliquely downward.
Since the lining plate fastening device of the present invention can unfold the clamp 20 simply by setting the rotary tool 70 on the head of the operation bolt 40 and pushing it in, the construction efficiency is very good.

<2.1> Position of the tip of the clamp.
The clamp 20 slides forward while keeping the side wall of the internal space 21 along both side surfaces of the nut 41.
Therefore, the closer the temporary fastening position of the nut 41 is to the tip of the operating bolt 40, the closer the protruding direction of the clamp 20 is to the vertical, and conversely, the temporary fastening position of the nut 41 is above the operating bolt 40, that is, the top of the bracket 10. The closer to the plate 11, the closer to the horizontal.
Therefore, by adjusting the position of the nut 41 temporarily fixed to the operation bolt 40, the tip of the clamp 20 can be accurately projected to the intermediate position between the upper flange 61 and the rib 62.

<3> Fastening operation bolts.
Using the rotary tool 70 set on the head of the operation bolt 40, the clamp 20 is fastened to the receiving beam 60 with the operation bolt 40 and the nut 41 (FIG. 6). Since the nut 41 is included in the inner space 21 so as not to rotate, the nut 41 is tightened and the clamp 20 is fastened to the cover plate 50 as the operation bolt 40 rotates.

<3.1> Fastened state.
When the clamp 20 is fastened, the front contact portion 28 of the clamp 20 is in contact with the lower surface of the upper flange 61 of the receiving beam 60, the rear contact portion 29 is in contact with the top plate 11 of the bracket 10, and the operation bolt 40 is (FIG. 2).
The axial force accompanying the fastening of the operation bolt 40 is distributed and transmitted to the front contact portion 28 and the rear contact portion 29 in inverse proportion to the distance from the bolt shaft.
Therefore, the transmission of the axial force to the front contact portion 28 increases as the ratio of the distance L ₂ from the bolt shaft to the rear contact portion 29 with respect to the distance L ₁ from the bolt shaft to the front contact portion 28 increases. The fastening force to the receiving beam 60 by the clamp 20 becomes strong.
Since the lining plate fastening apparatus of the present invention is rotated after the clamp 20 is slid and positioned, the rotation range of the clamp 20 is small. Therefore, it is possible to space constraints of the clamp 20 the rear end is small, to increase the distance L ₂ to the contact portion 29 after the bolt shaft.
Therefore, since the axial force due to the fastening of the operation bolt 40 is sufficiently transmitted to the front contact portion 28 of the clamp 20, the fastening force to the receiving beam 60 is strong.

[Release method of lining plate fastening device]
Next, a method for releasing the fastening of the lining plate fastening device of the present invention will be described.

Using the rotary tool 70, the head of the operation bolt 40 is rotated in the direction of loosening the fastening.
Here, since the nut 41 is included in the inner space 21 so as not to rotate, the nut 41 is loosened and detached from the operation bolt 40 as the operation bolt 40 rotates.
With the removal of the nut 41, the clamp 20 is pivotally supported by the horizontal guide hole 13 of the bracket 10 only by the support shaft 26 at the rear end, and the front end of the clamp 20 rotates downward about the support shaft 26.
In the lining plate fastening device of the present invention, even when the fastening of the clamp 20 is released, the rotation stopper 27 provided at the rear end of the clamp 20 abuts the inside of the top plate 11 of the bracket 10 to stop the rotation of the clamp 20. The front end of the clamp 20 does not hang down completely.
Therefore, when stacking the lining plates 50 after disassembly, even if the tip of the clamp 20 touches the lower lining plate 50, the tip of the clamp 20 rotates upward about the support shaft 26. The lining plate 50 is not damaged and the hanging position of the lining plate 50 is not shifted.
Therefore, the lining plate 50 after dismantling can be stacked and stored with the lining plate fastening device attached.

  The nut 41 released from the operation bolt 40 when the cover plate 50 is released is slid down along the internal space 21 along with the rotation of the clamp 20, and remains at the tip of the internal space 21. Therefore, the nut 41 does not fall outside during the dismantling operation of the lining plate 50, and safety is high.

[Example of providing an insertion slot at the rear of the clamp]
Another embodiment in which an insertion port is provided in the rear part of the clamp 20 will be described.
In this example, an insertion opening having a size through which the nut 41 can be inserted is provided at the rear end of the lower groove 24 of the clamp 20.
Therefore, the nut 41 can be inserted from the insertion port after the bracket 10 and the clamp 20 are assembled and welded to the cover plate 50 without setting the nut 41 in the internal space 21 in advance.
Therefore, unlike the first embodiment, it is not necessary to temporarily fix the operation bolt 40 and the nut 41 to the covering plate 50 until the covering plate 50 is laid.
In this example, since the operation bolt 40 does not protrude from the lower surface of the lining plate 50 during storage before laying the lining plate 50, the lining plates 50 can be stacked and stored.

[Example of re-fastening the operation bolt from below the lining plate]
Another embodiment in which the operation bolt 40 is refastened from the lower side of the lining plate 50 after the lining plate 50 is installed will be described (FIG. 7).
In the lining plate fastening device of the present invention, the tip of the operation bolt 40 protrudes from the lower groove 24 of the clamp 20 in a state where the lining plate 50 is fastened.
Therefore, the clamp 20 can be re-fastened from below the cover plate 50 by screwing the nut 41 to the tip of the operation bolt 40 protruding from the lower groove 24 and rotating the nut 41.
Therefore, when the operation bolt 40 is loosened after the lining plate 50 is installed, even if the upper surface 51 of the lining plate 50 is paved and the operation hole 53 is buried, the operation bolt 40 is tightened from below. You can fix it.

Bracket 10
Top plate 11
Side plate 12
Horizontal guide hole 13
Stopper groove 14
Notch 15
Bolt hole 16
Clamp 20
Interior space 21
Opening 22
Upper groove 23
Lower groove 24
Tip protrusion 25
Spindle 26
Rotation stopper 27
Front contact portion 28
Rear contact 29
Elastic member 30
Operation bolt 40
Nut 41
Washer 42
Lining board 50
Top surface 51
Lower surface 52
Operation hole 53
Insertion hole 54
Received digits 60
Upper flange 61
Rib 62
Rotating tool 70

Claims (5)

A lining plate fastening device for fixing the lining plate placed on the upper portion of the receiving beam to the receiving beam,
Attached to the lower surface of the lining plate, a bracket having a horizontal guide hole parallel to the plate surface of the lining plate,
A hollow structure clamp that is slidable and pivotally supported in a horizontal guide hole of the bracket via a horizontal support shaft;
An elastic member that is disposed between the bracket and the clamp, and that constantly urges the clamp in a protruding direction from the bracket;
A nut that is non-rotatable and slidably engaged in the clamp;
An operation bolt that penetrates the upper and lower surfaces of the lining plate and the bracket and is screwed with the nut,
By pushing the operation bolt, the tip protrusion formed on the front end of the clamp is locked to the stopper groove formed on the front of the bracket so that the clamp protrudes from the front of the bracket. It is positioned in the bracket,
Lining plate fastening device.   The lining plate fastening device according to claim 1, further comprising a protruding rotation stopper at a rear portion of the clamp.   The lining plate fastening device according to claim 1 or 2, further comprising an insertion port for inserting the nut into the clamp at a rear portion of the clamp.   The lining plate fastening apparatus according to any one of claims 1 to 3, wherein the elastic member is a tension spring.   The cover according to any one of claims 1 to 4, further comprising a re-fastening nut, wherein the re-fastening nut is screwed onto the operation bolt that has passed through the clamp to fasten the clamp. Work plate fastening device.

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