JP7747587B2 - Fastening mechanism of lining plate and lining plate - Google Patents

Description

The present invention relates to a fastening mechanism for a lining plate and a lining plate.

When excavating below the road surface for subway or sewer construction, or when constructing underground structures, such as for the construction of underground structures, lining plates are laid on the surface as temporary road decks to ensure access. Lining plates are laid by erecting girders made of, for example, H-beams in the excavated area on the ground surface, placing the lining plate on top of the girders, and fastening the lining plate to the girders using the fastening mechanism provided on the lining plate.

One example of a conventional lining plate fastening mechanism is shown in Figure 7. Figure 7 is a side view showing an example of a conventional lining plate fastening mechanism. The conventional lining plate fastening mechanism 100 includes a roughly L-shaped fastening fitting 101 that is hooked onto the flange portion 71 of a girder 70 made of H-beam steel. A fastening bolt 103 is attached to the fastening fitting 101 so that it penetrates the underside 61 of the lining plate 60 from bottom to top in the figure, and a nut 105 is attached to the threaded portion 106 of the fastening bolt 103. A nut 107 is placed between the fastening fitting 101 and the underside 61 of the lining plate 60.

A hanging hole (not shown) is drilled in the top surface (not shown) of the covering plate 60, into which the tip 110 of a special handle (not shown) for tightening the nut 105 can be inserted. The tip 110 of the handle is inserted into this hanging hole, and by turning the handle, the nut 105 is rotated, tightening the fastening bolt 103 and hooking and fixing the fastening fitting 101 to the flange portion 71 of the girder 70. Note that before installation, the fastening fitting 101 is positioned in a direction parallel to the girder 70; by turning the nut 105, the fastening fitting 101 rotates 90°, moving the tip toward the lower side of the girder 71; and by further tightening the nut 105, the fastening fitting 101 is firmly hooked to the girder 71.

A variety of fastening mechanisms for lining plates are available in addition to the one shown in Figure 7, including those shown in Patent Documents 1 to 3. All of Patent Documents 1 to 3 use springs.

Patent No. 6703178 Patent No. 5629396 Patent No. 3382412

The conventional lining plate fastening mechanism shown in Figure 7 required different mounting positions depending on the size of the girder, particularly the length of the flange. This meant that the mounting holes for attaching bolts and the positions of the hanging holes for inserting the handle tips had to be re-drilled on the underside of the lining plate depending on the girder being used. Furthermore, because the fastening was done by hand using a special handle, the fastening force was weak, which could lead to loosening. If the bolt were to loosen, the fastening hardware could fall. Furthermore, because the fastening work was done by hand, it took a long time.

The objective is to provide a lining plate fastening mechanism and lining plate that does not require changing the positions of mounting holes or suspension holes even when the sizes of the girders are different, and that allows bolts to be fastened using an electric tightening device such as an impact driver. The fastening mechanisms are attached near each of the four corners of the lining plate, but the objective is to provide a lining plate fastening mechanism and lining plate that allows the rotation direction of the fasteners to be changed even if the nut tightening direction is the same using the electric tightening device.

In order to solve the above problem, the present invention described in claim 1 provides a fastening mechanism for a lining plate for fixing the lining plate to a girder, comprising a pipe member attached so as to penetrate the underside of the lining plate, a guide member attached to the side of the pipe member so that its tip protrudes into the space inside the pipe member, a fastener having a cylindrical main body portion inserted axially inside the pipe member and having a hook portion on the upper side of a nut located at the lower end of the main body, the hook portion having a length necessary to hook the lining plate to the girder member, and a fastener located inside the pipe member. and a fastening bolt that penetrates the main body from above and screws into the nut; a guide groove is provided on the side of the main body of the fastening fitting, formed so that the tip of the guide member is positioned therein, in order to move the hanging portion from a position where it does not interfere with the beam to a position where it can hang the beam when the fastening bolt is tightened; when the fastening bolt is tightened, the rotation of the main body is controlled by the guide member that moves relatively along the guide groove, so that the hanging portion moves from a position where it does not interfere with the beam to a position where it can hang the beam.

In order to solve the above problem, the present invention described in claim 2 is characterized in that, in the fastening mechanism of the covering plate described in claim 1, the guide groove is formed so that the main body portion rotates approximately 90 degrees.

To solve the above problem, the present invention described in claim 3 is characterized in that, in the fastening mechanism for a lining plate described in claim 1, the pipe member is reinforced by a reinforcing rib when attached to the lining plate.

In order to solve the above problem, the present invention described in claim 4 is characterized in that, in the fastening mechanism for a covering plate described in claim 1, the guide groove is formed so that when the fastening bolt is tightened, it rotates in the same direction as the tightening direction, or when the fastening bolt is tightened, it rotates in the opposite direction to the tightening direction.

In order to solve the above problem, the present invention described in claim 5 is characterized in that, in a covering plate equipped with a covering plate fastening mechanism described in any one of claims 1 to 4, the covering plate fastening mechanisms are respectively arranged in the vicinity of the four corners of the covering plate, the hanging portion of each fastening fitting is arranged so that it is parallel to the girder and its tip faces toward the inside of the covering plate, and the guide groove of each fastening fitting is formed in a shape such that the hanging portion moves to a position where it hangs on the girder when the main body is rotated approximately 90 degrees.

In order to solve the above problem, the present invention described in claim 6 is characterized in that, in the lining plate described in claim 5, the bottom surface of the lining plate is provided with a protective member having a length that is positioned below the lower end position of the fastening mechanism of the lining plate to protect the fastening mechanism of the lining plate when the lining plates are stacked.

In order to solve the above problem, the present invention described in claim 7 is characterized in that, in the lining plate described in claim 6, the protective member is formed in a roughly L-shape in plan view, one side is parallel to the side of the lining plate, and is positioned near the fastening mechanism of the lining plate so as not to interfere with rotation of the hooking portion.

According to the fastening mechanism for a lining plate and the lining plate of the present invention, a guide groove is provided in the main body of the fastening fixture, which has the effect of reliably moving the hooking part from a position where it does not interfere with the girder to a position where it can hook the girder. Furthermore, since no spring is used, operation is reliable. Furthermore, since the shape of the guide groove varies depending on the position where the fastening mechanism is attached to the lining plate, the fastening fixture can be rotated in different directions even if the tightening direction by the electric tightening device is the same, which has the effect of significantly reducing operation time. Furthermore, since the hooking part has the length and strength necessary to be engaged with the girder, there is the effect that the positions of the mounting holes and suspension holes do not need to be changed even if the size of the girder is different.

FIG. 1 is a plan view of an embodiment of a lining plate equipped with a fastening mechanism for a lining plate according to the present invention. FIG. 2 is a front view illustrating the fastening mechanism of the covering plate according to the present invention. FIG. 3 is a side view illustrating the fastening mechanism of the covering plate according to the present invention. Figure 4(a) is a side view of the fastening fitting, (b) is a side view of another fastening fitting, (c) is an exploded view of the main body of the fastening fitting, and (d) is an exploded view of the main body of another fastening fitting. FIG. 5 is a side view of the pipe member. Figure 6 (A) is a front view of the fastening fitting when the covering plate is installed, (A') is a side view of the fastening fitting when the covering plate is installed, (B) is a front view of the fastening fitting when rotating, (B') is a side view of the fastening fitting when rotating, (C) is a front view of the fastening fitting when tightening is complete, and (B') is a side view of the fastening fitting when tightening is complete. FIG. 7 is a side view of a conventional fastener.

The fastening mechanism for the lining plate and the lining plate according to the present invention will be described in detail below based on a preferred embodiment. First, the fastening mechanism for the lining plate will be described with reference to the drawings.

[Covering plate fastening mechanism]
As shown in Figures 2 and 3, a fastening mechanism for a lining plate (hereinafter referred to as "fastening mechanism") 1 is generally configured to include fastening fittings 10, pipe members 20, and fastening bolts 30. As shown in Figure 1, the fastening mechanisms 1 are respectively arranged near the four corners of a lining plate 60 which is formed in a substantially rectangular shape. Note that in Figure 1, two types of fastening mechanisms are attached which have different rotation directions of the fastening fittings 10 depending on the placement location; specifically, a fastening mechanism 1 in which the fastening fittings 10 rotate clockwise, and a fastening mechanism 1' in which the fastening fittings 10 rotate counterclockwise; details of these will be described later.

The pipe member 20 is a hollow cylindrical member that is attached to the lining plate 60 near its four corners by passing through mounting holes 66 provided on the underside 61 of the lining plate 60. The side of the pipe member 20 located above the underside 61 of the lining plate 60 is reinforced by a reinforcing rib 25 that is approximately triangular in side view. The reinforcing rib 25 is fixed so that its base (adjacent side) contacts the underside 61 of the lining plate 60 and its opposite side contacts the side of the pipe member 20. Note that the shape of the reinforcing rib 25 is not limited to this, and multiple ribs can also be attached.

A guide member 40 is also arranged on the side of the pipe member 20 located below the underside 61 of the covering plate 60. The guide member 40 is attached in a direction perpendicular to the axial direction of the pipe member 20, with its tip protruding into the space inside the pipe member 20. The tip of the guide member 40 is arranged to be positioned within guide grooves 13, 13' provided in the main body 12 of the fastener 10, which will be described later.

The fastening fitting 10 comprises a cylindrical main body 12 and a hook portion 11 extending in a direction perpendicular to the axial direction of the main body 12. The main body 12 is inserted into the pipe member 20. A guide groove 13 formed in a predetermined shape is provided on the surface of the main body 12. A nut 14 is attached to the lower end of the main body 12 and threads onto a fastening bolt 30 that is attached so as to pass through the inside of the main body 12. The hook portion 11 is positioned above the nut 14 so that its bottom is in contact with the nut 14.

The hooking portion 11 is attached to the main body 12 so as to extend in a direction perpendicular to the axial direction of the main body 12. The surface side extends at the same height from the base end to the tip end, while the bottom side slopes upward so that its thickness decreases toward the tip end. The shape of the hooking portion 11 is not limited to the one shown in the figure; any suitable shape, such as a rectangular parallelepiped, can be used. The length and thickness of the flange portion 71 of the girder 70 vary depending on its size. Therefore, the fastening mechanisms 1, 1' are positioned on the covering plate 60 so as not to interfere with the flange portion 71 even when it is at its longest length, and are set to a length that allows the hooking portion 11 to hook the flange portion 71 even when it is at its shortest length. The length and thickness of the flange portion 71 of the girder 70 are, specifically, approximately 200 mm from the center and approximately 28 mm thick for the longest portion, and approximately 150 mm from the center and approximately 15 mm thick for the shortest portion, but this is just an example and is not limited to this. It goes without saying that the hook portion 11 must have the strength to securely fix the covering plate 60 to the girder 70.

A guide groove 13 is formed on the side of the main body 12. The guide groove 13 extends axially (upward) from a position slightly above the base end of the hook 11 at its lower end, then tilts midway, rotating a quarter turn around the surface of the main body 12, before continuing axially (upward). As described above, the guide groove 13 is positioned so that the tip of the guide member 40 can be inserted into it. Tightening the fastening bolt 30 rotates the main body 12 of the fastener 10 in a predetermined direction. By providing the guide groove 13 in the main body 12 and controlling vertical movement and rotation with the guide member 40, co-rotation of the fastener 10 due to tightening of the fastening bolt 30 can be prevented. As described above, the thickness of the flange 71 varies depending on the type of beam 70 used, ranging from 15 to 28 mm, for example. Therefore, the shape of the guide grooves 13, 13' is determined to allow the hook 11 to move toward the flange 71 in all cases.

Here, there are two types of guide grooves 13: those shown in Figures 1, 2, and 4(a) and (c), and guide groove 13' shown in Figures 4(b) and (d), which are rotated a quarter turn in the opposite direction. This is to ensure that the rotation direction of the fastener 10 and the latch portion 11 is clockwise and counterclockwise when the fastening bolt 30 is tightened, as will be described later. Specifically, the guide grooves 13 shown in Figures 4(a) and (c) are clockwise, and the guide grooves 13' shown in Figures 4(b) and (d) are counterclockwise. The two types of guide grooves 13, 13' are provided so that the rotation direction of the fastener 10 and the hooking portion 11 can be changed depending on the attachment position to the lining plate 60. The hooking portion 11 of the fastener 10 can be rotated approximately 90 degrees so that the lining plate 60 can be laid on the girder 70 with the hooking portion 11 positioned so that it does not interfere with the girder 70, and then the hooking portion 11 of the fastener 10 can be moved to a position where it can hook the girder 70. Note that the two types of fastening mechanisms 1, 1' basically only differ in the relatively symmetrical shapes of the guide grooves 13, 13', so the necessary explanation will be based on the clockwise fastener 10.

A nut 15 is placed below the nut 14 located at the bottom end of the main body 12 of the fastener 10, with a washer 16 sandwiched between them. The nut 15 is a stepped nut, and is provided with a recess 15a for inserting a split pin 17 (see Figure 2).

The fastening bolt 30 is inserted from top to bottom through the main body 12 of the fastener 10, which is located inside the pipe member 20. When threaded onto the nuts 14 and 15, the tip of the fastening bolt 30 protrudes slightly beyond the nuts 15. A through-hole 35 is drilled perpendicular to the axial direction at the tip of the fastening bolt 30. A split pin 17 is inserted into the through-hole 35 of the fastening bolt 30 through the recess 15a of the nut 15, thereby integrating the nut 15 and the fastening bolt 30. This prevents the fastening bolt 10 from falling out, and by tightening the fastening bolt 30, the fastening bolt 10 can be moved upward without its tip advancing beyond the nut 15. The fall prevention mechanism is particularly useful because it is difficult to visually check the condition of the fastening bolt 10 during installation. A washer 50 is positioned at the upper end of the pipe member 20, interposing the washer 50 between the head of the fastening bolt 30 and the upper end of the pipe member 20. In addition, a hanging hole 63 is drilled on the top surface of the covering plate 60 on which the pipe member 20 is placed, allowing an electric tightening device to be inserted to tighten the fastening bolts 30.

[Covering plate with fastening mechanism]
The above-mentioned fastening mechanisms 1, 1' are arranged near the four corners of the covering plate 60 as shown in Figure 1, and the clockwise or counterclockwise fastening mechanisms 1, 1' are arranged as follows: That is, before being laid on the girder 70, the hooking portions 11, 11 of the fastening mechanisms 1, 1' are positioned so that their tips face the inside of the covering plate 60 and are parallel to the girder 70, and when the hooking portions 11, 11 are hooked onto the flange portions 71 of the girder 70, the fastening mechanisms 1, 1' are arranged so that the tips of the hooking portions 11, 11 can hook onto the flange portions 71 of the girder 70 by rotating them by approximately 90°. By arranging the fastening mechanisms 1, 1' in this way, the hooking portions 11, 11 can be moved with the minimum rotation angle.

In addition, a protective member 65 is attached to the lower side of the underside 61 of the lining plate 60, with a length that positions it further below the lower end of the fastening mechanisms 1, 1'. The protective member 65 is provided to protect the fastening mechanisms 1, 1' by preventing them from colliding with the lining plate 60 below when multiple lining plates 60 are stacked. The protective member 65 is formed in a roughly L-shape in plan view, and is positioned so that one side is parallel to the side of the lining plate 60 and so as not to interfere with the 90-degree rotation of the hook portion 11. Note that reference numeral 67 denotes a stopper that prevents the lining plate 60 from shifting after it has been installed.

[Operation of fastening mechanism]
The operation of the above-mentioned fastening mechanism 1 (clockwise) will be described with reference to Fig. 6. The operation of the fastening mechanism 1' (counterclockwise) is basically the same except for the direction of rotation of the hook portion 11 and the main body portion 12, so only the fastening mechanism 1 will be described.

The covering plates 60 equipped with fastening mechanisms 1, 1' are placed adjacent to each other on top of the pre-installed girder 70. At this time, the hooking portion 11 is positioned parallel to the flange portion 71 of the girder 70 so as not to interfere with it (Figures 6(A) and (A')).

When an electric tightening device (not shown) is inserted through the hanging hole 63 and the fastening bolt 30 is tightened, the main body 12 of the fastening fitting 10 begins to move upward. At this time, the guide member 40 attached to the pipe member 20 is positioned within the guide groove 13 formed in the main body 12, so the guide member 40 is guided relatively within the guide groove 13 without moving, causing the main body 12 to rotate. Because the upper and lower ends of the guide groove 13 are located approximately a quarter-turn around the surface of the main body 12, the main body 12 rotates approximately 90° clockwise, causing the tip of the hook portion 11 to move toward the flange portion 71 of the beam 70 (Figures 6(B) and (B')). The reaction force generated when the fastening bolt 30 is tightened is handled by the overlapping portion (lap portion) between the main body 12 of the fastening fitting 10 and the pipe member 20 and the reinforcing rib 25. This allows for accurate adjustment to differences in the thickness of the flange portion 71 of the beam 70.

Then, by further tightening the fastening bolt 30, the fastening fitting 10 moves upward and the hook portion 11 abuts against the flange portion 71 of the beam 70, firmly securing it. In the same way, the other fastening mechanisms 1, 1' are each secured to the beam 70.

As described above, the fastening mechanism for a lining plate and the embodiment of the lining plate according to the present invention have the advantage of being able to reliably move the hooking portion 11 from a position where it does not interfere with the girder 70 to a position where it can hook the girder 70. Furthermore, because the shape of the guide grooves 13, 13' varies depending on the position at which the fastening mechanisms 1, 1' are attached to the lining plate 60, the rotation direction of the fastening fittings 10 (see arrows in Figure 1) can be different even if the tightening direction is the same. This allows a common electric tightening device to be used for both types of fastening mechanisms 1, 1', eliminating the need to switch devices, and significantly reducing work time. Furthermore, because the hooking portion 11 has the length required to hook onto the girder 70, there is no need to change the positions of the mounting holes 66 or hanging holes 63 even if the length to the flange portion 71 of the girder 70 is different.

[others]
As described above, preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the specific embodiments described above, and it goes without saying that various modifications and changes are possible within the scope of the gist of the present invention as set forth in the claims.

1, 1' Fastening mechanism 10 Fastening metal fitting 11 Hooking portion 12 Main body portion 13, 13' Guide groove 14 Nut 15 Nut 16 Washer 17 Split pin 20 Pipe member 30 Fastening bolt 35 Through hole 40 Guide member 50 Washer 60 Covering plate 61 Underside 63 Hanging hole 65 Protective member 66 Mounting hole 67 Stopper

Claims (7)

In a fastening mechanism for a lining plate for fixing the lining plate to a girder material,
A pipe member attached so as to penetrate the lower surface of the covering plate;
a guide member attached to a side surface of the pipe member such that a tip of the guide member projects into a space inside the pipe member;
a fastening fitting having a cylindrical main body portion that is inserted axially inside the pipe member, and having a hook portion of a length necessary for hooking the covering plate to the girder material on the upper side of a nut located at the lower end of the main body;
a fastening bolt that penetrates from above through the main body of the fastening fitting disposed inside the pipe member and threadably engages with the nut;
Equipped with
A fastening mechanism for a covering plate, characterized in that a guide groove is provided on the side of the main body of the fastening fitting so that the tip of the guide member is positioned so that when the fastening bolt is tightened, the hanging portion moves from a position where it does not interfere with the girder to a position where it can hang the girder, and when the fastening bolt is tightened, the rotation of the main body is controlled by the guide member which moves relatively in the guide groove, so that the hanging portion moves from a position where it does not interfere with the girder to a position where it can hang the girder. The fastening mechanism for the covering plate according to claim 1,
A fastening mechanism for a covering plate, characterized in that the guide groove is formed so that the main body portion rotates approximately 90 degrees. The fastening mechanism for the covering plate according to claim 1,
A fastening mechanism for a lining plate, characterized in that the pipe member is attached to the lining plate by a reinforcing rib. The fastening mechanism for the covering plate according to claim 1,
A covering plate fastening mechanism characterized in that the guide groove is formed so as to rotate in the same direction as the tightening direction when the fastening bolt is tightened, or is formed so as to rotate in the opposite direction to the tightening direction when the fastening bolt is tightened. A lining plate equipped with the fastening mechanism for a lining plate according to any one of claims 1 to 4,
The fastening mechanisms of the lining plate are respectively arranged in the vicinity of the four corners of the lining plate,
A covering plate characterized in that the hooking portion of each fastening fitting is arranged parallel to the girder with its tip facing toward the inside of the covering plate, and the guide groove of each fastening fitting is formed in a shape such that the hooking portion moves to a position where it hooks the girder when the main body is rotated approximately 90 degrees. The covering plate according to claim 5,
A covering plate characterized in that the bottom surface of the covering plate is provided with a protective member having a length that positions it below the lower end position of the fastening mechanism of the covering plate in order to protect the fastening mechanism of the covering plate when the covering plates are stacked. The covering plate according to claim 6,
The protective member is formed in an approximately L-shape when viewed from above, and is positioned near the fastening mechanism of the covering plate so that one side is parallel to the side of the covering plate and so as not to interfere with the rotation of the hanging portion.