Liner plate lifting gripping device

Abstract

To provide a gripping device for suspending a liner plate, which is made small and lightweight with a simple configuration, can easily load a plurality of liner plates, and improves the efficiency of slinging work. [Solution] Multiple support hooks 3, 4 are raised upward from the frame 2 so as to hook onto bolt holes P2 for interconnecting liner plates P. The overall length of the frame 2 is equal to or less than the length of the short side of the liner plate P, and a pull tab 6 protrudes perpendicular to the short side. The support hook 4 is journaled on the frame 2 so as to be rotatable between an unlocked position where it can be inserted and removed from the bolt hole P2 together with the other support hooks 3, and a locked position where it is displaced relative to the other support hooks 3 to prevent it from coming out of the bolt hole P2. An engaging bulge 4a is provided that protrudes from the opening edge of the bolt hole P2 due to the eccentricity of the support hook 4 in the locked position. An auxiliary locking piece 9 is journaled on the frame 2 and engages with a lever 8 that rotates the support hook 4 when the lever 8 is in the locked position, preventing it from rotating to the unlocked position.

Description

[Technical Field]

[0001] The present invention relates to a gripping device that supports a liner plate in order to lift, raise, and transport the liner plate used to retain soil on a hole wall at a construction site such as a vertical shaft. [Background technology]

[0002] At construction sites where excavation is being carried out for various purposes, such as shafts and deep foundations, cylindrical earth retaining structures are assembled along the wall of the excavation to prevent collapses and the inflow of soil and sand. Earth retaining structures are made up of a large number of liner plates connected vertically and horizontally. These liner plates are corrugated steel plates with assembly flanges on all four sides, and these flanges have bolt holes for connecting them together. During the assembly work of the earth retaining structure, each time a shaft or other structure is excavated to a certain depth, the required number of liner plates are stacked and bundled together, as shown in Figure 13, and then attached with lifting wires and transported into the shaft using a crane or other device, such as a crane hook.

[0003] Patent document 1 discloses a liner plate hanger that includes a main frame that is L-shaped in side view and has a vertical frame section that supports the outer surface of the topmost liner plate when multiple liner plates are stacked together, and a horizontal frame section that supports one edge of each liner plate, left and right swinging arms that are pivoted to the tip of the vertical frame section and have ropes suspended from a crane hook hooked to their tips, and a connecting member that has one end pivoted to the tip of the swinging arms and the other end pivoted to the tip of the horizontal frame section and can be raised and lowered together with the swinging arms. This liner plate hanger works by placing the vertical frame section horizontally, stacking multiple liner plates with their outer surfaces placed underneath on the vertical frame, hooking the rope attached to the crane hook to the tip of the swinging arm and hooking the connecting member to the horizontal frame section, and lifting the liner plates with a crane or the like, with the rope tightening around the upper ends of the stacked liner plates, holding them together. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 4-22586 Summary of the Invention [Problem to be solved by the invention]

[0005] The general method of lifting the required number of stacked and bundled liner plates described above makes it difficult to secure the sling wires. Furthermore, the conventional liner plate hangers described above require a bulky main frame, including a vertical frame section spanning the length of the liner plates and a horizontal frame section spanning the number of stacked liner plates, as well as a relatively large number of swing arms and connecting members, resulting in a large and heavy construction that makes them difficult to transport and handle. When multiple liner plates are stacked horizontally in a material storage area, for example, with no gaps between them, the liner plates must be moved for loading and slinging, resulting in poor work efficiency. Furthermore, depending on the number of liner plates stacked, the slinging of the rope to multiple stacked liner plates essentially involves slinging on an arcuate surface, which can lead to misalignment of the liner plates relative to each other due to misalignment of the suspension points or impact from contact with other parts, resulting in safety issues. Therefore, the present invention has been made in consideration of the above problems, and aims to provide a liner plate lifting and holding device that is simple in configuration, small and lightweight, easy to load, can directly lift liner plates stacked vertically and arranged horizontally without gaps, regardless of the number of plates, and can securely hold the plates without shifting the lifting point even if an impact is applied during lifting. [Means for solving the problem]

[0006] To solve the above problems, the liner plate lifting and gripping device of the present invention is a gripping device for lifting and transporting a liner plate having four opposing long and short sides, the liner plate having a plurality of bolt holes for interconnection in flanges on the short edges of the steel plate, by using a lifting member. The gripping device 1 includes a plurality of support hooks 3, 4 that can be hooked onto bolt holes P2 in flanges P1 on the short edges of the liner plate P for support, and a frame 2 that connects the plurality of support hooks 3, 4 and has pull tabs 6 at both ends for engaging the lifting wires of the lifting members. The frame 2 has a total length equal to or less than the length of the short side of the liner plate P, and the pull tab 6 is protruded in a direction perpendicular to the short side of the liner plate P. The support hooks 3, 4 are raised upward from the frame 2, and at least one support hook 4 is rotatably supported together with the support hook 4 on the frame 2 between an unlocked position where it can be inserted into and removed from the bolt hole P2 together with the other support hooks 3, and a locked position where it is displaced relative to the other support hooks 3 to prevent it from being removed from the bolt hole P2, and is provided with a lever 8 for rotating the support hook 4. At least one of the support hooks 4 has an engaging bulge 4a on the curved outer surface thereof, which is eccentric in the locked position and projects outward from the opening edge of the bolt hole P2 to prevent it from coming off. An auxiliary lock piece 9 is provided which engages with the lever 8 in the locked position to prevent the lever 8 from rotating to the unlocked position. [Effects of the Invention]

[0007] According to the present invention, the structure is simple with few components, making it small and lightweight, and easy to transport and handle.In particular, the support hooks are easy to attach by inserting them into the bolt holes, and any number of stacked liner plates can be easily lifted without having to be moved from their placement location for rigging, thereby making rigging work more efficient. Furthermore, if the frame has a total length less than the short side length of the liner plate and the pull tab protrudes perpendicular to the short side of the liner plate, it can be attached to multiple stacked and aligned horizontally without any gaps without interfering with adjacent liner plate groups. Furthermore, when the support hook is rotated to the lock position, the support hook is prevented from coming off, and the liner plate can be securely held. By providing an engaging bulge on the support hook or by providing an auxiliary locking piece on the lever, the support hook can be more reliably prevented from coming off, thereby improving safety. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a front perspective view of a liner plate hanging gripping device according to the present invention; [Figure 2] FIG. 2 is a rear perspective view of the liner plate hanging gripping device of FIG. 1. [Figure 3] FIG. 2 is a front view of the liner plate hanging gripping device of FIG. 1. [Figure 4] FIG. 2 is a rear view of the liner plate hanging gripping device of FIG. 1. [Figure 5] FIG. 2 is a side view of the liner plate hanging gripping device of FIG. 1. [Figure 6] 2 is a front perspective view of the liner plate hanging gripping device of FIG. 1 in a locked state. FIG. [Figure 7] 2 is a rear perspective view of the liner plate hanging gripping device of FIG. 1 in a locked state. FIG. [Figure 8] 2 is a front view of the liner plate hanging gripping device of FIG. 1 in a locked state. FIG. [Figure 9] 2 is a rear view of the liner plate hanging gripping device of FIG. 1 in a locked state. FIG. [Figure 10] 2 is a side view of the liner plate hanging gripping device of FIG. 1 in a locked state. FIG. [Figure 11] FIG. 10 is a front view of the support hook in the locked position. [Figure 12] FIG. 2 is a perspective view of the liner plate hanging gripping device in an installed state. [Figure 13] This is a photograph of a liner plate in a typical lifted state. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present invention will be described with reference to the drawings. 1 to 10, as shown in Fig. 12, the gripping device 1 grips liner plates P made of corrugated steel plates that are arc-shaped in plan view and have flanges P1 on all four edges, and then lifts any number of stacked liner plates P together with a crane or the like using a lifting member consisting of a wire rope and a crane hook, transports them to a predetermined location such as a vertical shaft, and lowers them. The flanges P1 have bolt holes P2 for connecting the plates together vertically and horizontally. The gripping device 1 includes a frame 2 made of a long, rectangular steel plate material with two front and rear faces, support hooks 3 and 4 that rise forward from the front of the frame 2, and a locking mechanism 5 attached to the rear face of the frame 2.

[0010] The frame 2 has a total length equal to or less than the short side length of the liner plate P. The frame 2 has pull handles 6 that rise at right angles to the rear at both ends of its length and extend upward, and an opening at the top into which the clevis bolt of the shackle S for securing the wire rope is inserted, and a retaining ring 7 at the center of the upper edge through which the load-tightening belt is passed.

[0011] The support hooks 3, 4 are arranged in a row at intervals on the front of the frame 2 so that they can be freely inserted and removed from four bolt holes P2 in the flange P1 on the short side of the liner plate P. The support hooks 3, 4 rise from the frame 2 at a nearly right angle and are curved upward away from the axis of their rise. The outer support hook 3 is fixed to the frame 2, and the inner support hook 4 is rotatably supported on the frame 2.

[0012] The inner support hook 4 is supported by the frame 2 so as to be rotatable about its axis between an unlocked position where it is aligned with the axis of the bolt hole P2 of the liner plate P and can be freely inserted and removed together with the outer support hook 3, and a locked position where it is relatively displaced 90° about the axis of the bolt hole P2 and is prevented from coming out. The curved outer surface of this support hook 4 is provided with an engaging bulge 4a which passes through the opening of the bolt hole P2 in the unlocked position, but which protrudes outward from the edge of the opening of the bolt hole P2 as the support hook 4 is eccentric in the locked position, preventing the support hook 4 from coming out.

[0013] The locking mechanism 5 includes a lever 8 with a knob that is connected to the base end of the support hook 4 that penetrates the frame 2 and extends along the back surface of the frame 2, and an auxiliary locking piece 9 that restricts the rotation of the lever 8. When the lever 8 is rotated along the back surface of the frame 2, the support hook 4 rotates with it. The rotation range of the lever 8 is restricted by an upper stopper 10 that protrudes from the back surface of the frame 2 and corresponds to the unlocked position, and a lower stopper 11 that similarly corresponds to the locked position. The auxiliary locking piece 9 is pivotally supported along the back surface of the frame 2 so as to be able to swing freely between a disengaged position where it is separated from the lever 8 in the locked position and an engaged position where it is close to it. The auxiliary locking piece 9 has a notch 8a that receives the lever 8 in the locked position and prevents it from rotating to the unlocked position. The swing range of the auxiliary locking piece 9 to the unlocked position is restricted by a stop pin 12 that protrudes from the back surface of the frame 2, and its reversal at the engaged position is restricted by a plunger 13.

[0014] As shown in Figure 12, a pair of gripping devices 1 are attached to both flanges P1 on opposing short sides of a liner plate P. Each gripping device 1 has support hooks 3, 4 inserted into bolt holes P2, and the support hooks 4 are rotated to the locked position with lever 8, while the auxiliary locking pieces 9 are tilted toward the lever 8 to receive the lever 8 in their notches 9a, thereby locking the support hooks. When the lever 8 is rotated to the locked position, the tip of the support hook 4 is displaced relative to that of the outer support hook 3, preventing the support hook 4 from coming out of the bolt hole P2. At the same time, the support hook 4 is eccentric with respect to the bolt hole P2, causing the engagement bulge 4a to protrude outward from the opening edge of the bolt hole P2, as shown in Figures 8 and 11, thereby reliably preventing the support hook 4 from coming out. Furthermore, the auxiliary locking piece 9 is prevented from reversing to the disengaged position by the plunger 13, and the engagement with the lever 8 is not easily released even by vibrations during lifting or impacts caused by contact between the liner plate P and the wall surface of the vertical pile or construction equipment, etc., further reliably preventing the support hook 4 from coming off. As a result, the liner plate P is prevented from falling off the gripping device 1. For multiple stacked and temporarily placed liner plates P, the required number of the lowest liner plates P are fitted with the gripping device 1 as described above, and then the shackle S is connected to the pull handle 6 with a clevis bolt, the wire rope is fastened to the shackle S, the wire rope is hung on a crane hook and slightly lifted by a crane or the like, and a securing belt is passed through the retaining ring 7 to secure them together. Because the frame 2 and pull handle 6 do not protrude in the direction of the short side of the liner plate P, they can be fitted to adjacent liner plates P arranged closely together horizontally without interfering with them. After transporting the liner plate P, the auxiliary lock piece 9 is rotated to a disengaged position away from the lever 8 while pressing the plunger 13, and the lever 8 is rotated to the unlocked position to unlock the support hook 4, and the support hooks 3 and 4 are each removed from the bolt holes P2, and the gripping device 1 is removed.

[0015] In the above embodiment, the liner plate P is described as an example of a steel plate having an arc-shaped cross section when viewed from above, but this is not limited to this, and the gripping device of the present invention can be applied to plates with various cross sections such as C-shaped and J-shaped. [Explanation of symbols]

[0016] 1 Gripping device 2 frames 3 support hooks 4 support hooks 4a Engagement bulge 5 Locking mechanism 6 Pull Handle 7 Retaining ring 8 Lever 8a Notch 9 Auxiliary lock piece 10 Upper stopper 11 Lower stopper 12 Stop pin 13 Plunger P liner plate P1 flange P2 bolt hole S shackle

Claims

1. A gripping device for lifting and lowering a liner plate having four opposing long and short sides, the liner plate having a plurality of bolt holes for interconnection in flanges on the short edges of the steel plate, using a lifting member, a plurality of support hooks that can be hooked onto the bolt holes to support the liner plate; A liner plate lifting gripping device characterized by having a front surface from which the support hooks rise and a back surface on the opposite side, pull tabs at both ends of the back surface for engaging the lifting wire of the lifting member, and a frame for connecting multiple support hooks.

2. 2. The liner plate hanging gripping device according to claim 1, wherein the frame has a total length equal to or less than the short side length of the liner plate, and the pull tab protrudes in a direction perpendicular to the short side.

3. The support hooks are curved upward in a direction perpendicular to the front surface of the frame, and at least one of them is rotatably supported along the back surface of the frame together with the support hook between an unlocked position where it can be inserted and removed into the bolt hole together with the other support hooks, and a locked position where it is displaced relative to the other support hooks to prevent it from being removed from the bolt hole, and is characterized in that it is equipped with a lever for rotating the support hook.

4. A liner plate lifting gripping device as described in claim 3, characterized in that the curved outer surface of at least one support hook is provided with an engaging bulge portion that protrudes outward from the opening edge of the bolt hole by being eccentric in the locked position, thereby preventing it from coming loose.

5. 4. The gripping device for hanging a liner plate according to claim 3, further comprising an auxiliary locking piece that engages with the lever in the locked position to prevent the lever from rotating to the unlocked position.

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