JP7579682B2 - Lifting jig, lifting jig set, lifting device, and lifting method - Google Patents

Description

This invention relates to technology for raising and lowering a suspended load, and more specifically, to a lifting jig that uses a link mechanism, a lifting jig set that includes this lifting jig, a lifting device, and a lifting method that uses this lifting device.

Generally, when a crane is used to lift a load, a hook attached to the end of a wire rope is used. Specifically, the load is hoisted by either attaching the hook directly to part of the load, or by connecting the hook to part of the load via a shackle. Whether a hook or a shackle is used, a small hole or key on the load is used.

When attaching a hook to a load that does not have a suitable hole, additional work is required. For example, a fastener with a hole, such as an eye bolt, may be attached to the load, and the hook may be attached using that fastener.

However, when hoisting planar loads (hereafter referred to as "planar objects" for convenience) such as the steel deck plates of bridges or the fields of stadiums, which have planar dimensions (large surface areas) that are superior to their thickness dimensions, slinging is extremely difficult. Even if slinging is performed on planar objects, they tend to become unstable when hoisted, and it is not practical to perform normal slinging operations on planar objects with large surface areas in the first place. In particular, attaching perforated fastenings to planar objects such as deck plates requires the procurement of excess material (perforated fastenings) that is not required for the intended purpose, and requires work such as attaching and removing the perforated fastenings, which increases the time and cost of the work.

Therefore, Patent Document 1 proposes a technology that uses a lifting device equipped with a lifting jig to transport the deck plate to the floor construction floor.

JP 2018-044372 A

The technology disclosed in Patent Document 1 is advantageous in that it can lift deck plates (floor slab units) that have a relatively large surface area without the need to attach new perforated fasteners. However, this technology requires the preparation of a "lifting jig" that is composed of a two-layer structure consisting of a "lifting jig" made of end plate material and a "traverser" mainly made of hanging frame material, which creates problems such as the cost of manufacturing and maintaining it, as well as the complicated and time-consuming task of rigging the lifting jig onto the deck unit. Furthermore, the technology in Patent Document 1 can only be used for deck plates that have a "rebar truss" made of upper and lower end bars and lattice bars installed between them, meaning that it has low versatility.

The objective of the present invention is to solve the problems of the conventional technology, that is, to provide a lifting jig, a lifting jig set, a lifting device, and a lifting method using the lifting device, which can grasp a load more easily than conventional technology without the need for a new perforated fastener.

This invention was developed with a focus on the point that the lifting jig is attached to part of the load by utilizing a link mechanism including a left gripping arm and a right gripping arm, and by reducing the included angle formed by these left gripping arms, it is an invention based on a previously unconventional idea.

The hoisting jig of the present invention comprises a gripping body, an auxiliary body, and an upper connecting body. The right end of the left gripping arm and the left end of the right gripping arm are hinged. The left end of the left gripping arm and one end of the left auxiliary arm are hinged, and the right end of the right gripping arm and one end of the right auxiliary arm are hinged, and the other end of the left auxiliary arm is hinged to the upper connecting body and the other end of the right auxiliary arm is hinged to the upper connecting body. An insertion space is formed in the gripping body through which part of the suspended load can be inserted. When the upper connecting body is raised with the upper connecting body facing up, the angle formed by the left gripping arm and the right gripping arm becomes smaller, and part of the gripping body is engaged with the part of the suspended load inserted into the insertion space.

The hoisting jig of the present invention can also be configured so that the left gripping arm is provided with a left fitting body, and the right gripping arm is provided with a right fitting body. The left fitting body and the right fitting body can be fitted into fitting grooves provided in a part of the suspended load.

The hoisting jig of the present invention may be such that the left gripping arm includes a first left gripping arm and a second left gripping arm, and the right gripping arm includes a first right gripping arm and a second right gripping arm. In this case, the first left gripping arm and the second left gripping arm are hinged, and the first right gripping arm and the second right gripping arm are hinged, and the right end of the first left gripping arm and the left end of the first right gripping arm are hinged, and further, the left end of the second left gripping arm and one end of the left auxiliary arm are hinged, and the right end of the second right gripping arm and one end of the right auxiliary arm are hinged. The left fitting body is a left pin that hinges the first left gripping arm and the second left gripping arm, and the right fitting body is a right pin that hinges the first right gripping arm and the second right gripping arm.

The hoisting jig of the present invention comprises the hoisting jig of the present invention, a head protrusion with an engagement groove formed therein, and a locking body having a lower stopper. When the upper connecting body is raised with the upper connecting body facing upward, the included angle formed by the left gripping arm and the right gripping arm becomes smaller, and the left fitting body and the right fitting body fit into the fitting groove of the head protrusion inserted into the insertion space, thereby locking the locking body to the hoisting jig. Then, the locking body, which is inserted into a through hole provided in the suspended load with the lower stopper facing downward, is locked to the hoisting jig, and the lower stopper supports the suspended load from below, allowing the hoisting jig to grip the suspended load via the locking body.

The lifting device of the present invention is a device for lifting and lowering a planar body, and is equipped with the lifting jig set of the present invention, a ceiling body arranged above the planar body, a lifting body arranged below the ceiling body and capable of moving up and down, and a hoisting means fixed to the ceiling body for lifting and lowering the lifting body. The lifting jig is attached to the lifting body with the upper connecting body facing up, and multiple lifting jigs are arranged to cover the planar body in a planar manner. The planar body is also provided with through holes at positions facing the lifting jig. Then, locking bodies (head protrusions) inserted into each of the through holes with the lower stoppers facing downward are locked to the lifting jig, and the lower stoppers support the planar body from below, so that the planar body held in a planar manner by the multiple lifting jigs can be lifted and lowered by the hoisting means.

The lifting device of the present invention can also have different arm lengths for each lifting jig, determined by the length of the left gripping arm and the length of the left auxiliary arm (or the length of the right gripping arm and the length of the right auxiliary arm). In this case, lifting jigs with shorter arm lengths are attached closer to the center of the lifting body, and lifting jigs with longer arm lengths are attached closer to the ends of the lifting body, so that when the planar body is lifted, it slopes downward from the center to both ends.

The lifting method of the present invention is a device for lifting and lowering a planar body, and is a method for lifting and lowering a planar body using the lifting device of the present invention, and includes a locking body protruding step, a locking step, and a lifting step. In the locking body protruding step, a part of the locking body inserted into the through hole is protruded above the planar body with the lower stopper facing downward, and in the locking step, a part of the locking body protruding from the planar body and inserted into the insertion space is locked to the lifting jig. In the lifting step, the lifting body is raised by the hoisting means, and the planar body held planarly by the multiple lifting jigs is lifted. In the locking step, the lifting body is raised by the hoisting means to reduce the included angle formed by the left gripping arm and the right gripping arm, and the left fitting body and the right fitting body are fitted into the fitting groove of the head protruding body inserted into the insertion space, thereby locking the locking body to the lifting jig.

The lifting method of the present invention can also be a method that further includes a suspending process. In this suspending process, the lifting body is lowered by a hoisting means to suspend the planar body that is gripped planarly by the multiple suspending jigs. In the suspending process, the lifting body is lowered even after the planar body is placed on the ground, thereby increasing the included angle formed by the left gripping arm and the right gripping arm, and the locking of the locking body by the suspending jig is released.

The hoisting jig, hoisting jig set, lifting device, and lifting method of the present invention have the following effects.
(1) The load can be slinged without the need for the installation of a perforated fastening device.
(2) Because of its simple structure utilizing a multi-joint link mechanism, the lifting jig, lifting jig set, and lifting device of the present invention can be manufactured easily and at low cost. Furthermore, by using the lifting device of the present invention, the effort and cost involved in lifting and lowering a load can be reduced.
(3) If the object is a convex object that can be engaged with the gripping body, or has a through hole into which the engaging body can be inserted, it can easily lift even planar objects with a relatively large surface area, such as bridge deck plates or stadium fields.

FIG. 4A is a side view showing the hoisting jig with its lower end in contact with the ground, and FIG. 4B is a side view showing the hoisting jig in a lifted state. FIG. 4A is a side view showing an example of a gripping body, and FIG. 4B is a plan view showing an example of the gripping body. FIG. 13 is a side view showing a schematic diagram of a state in which a plate material is lifted by using a lifting jig having a fitting body. FIG. 2A is a side view showing a gripping body having a left gripping arm and a right gripping arm made of two members, and FIG. 2B is a plan view showing a gripping body having a left gripping arm and a right gripping arm made of two members. 1A is a cross-sectional view showing a locking body inserted into a through hole provided in a plate material, and FIG. 1B is a cross-sectional view showing the locking body held by a hanging jig. A plan view showing the competition field. 1A is a side view showing a schematic diagram of the lifting device of the present invention, and FIG. 1B is a plan view showing the arrangement of through holes provided on a sports field. FIG. (a) is a partial cross-sectional view of the playing field showing the state in which the grass on the head protrusion is made the same height as the other grass by pushing down the retaining body, and (b) is a partial cross-sectional view of the playing field showing the state in which the retaining body is pushed up to cause the head protrusion to protrude from the playing field so that it can be grasped with a lifting jig. FIG. 13 is a side view showing a lifting body having a lifting jig with different arm lengths attached thereto. FIG. 2 is a flow chart showing the main steps of the lifting method of the present invention when lifting a load. 1 is a step diagram showing the main steps of the lifting method of the present invention when lifting a load. FIG. 2 is a flow chart showing the main steps of the lifting method of the present invention when lowering a load. FIG. 2 is a step diagram showing the main steps of the lifting method of the present invention when lowering a load.

An example of an embodiment of the lifting jig, lifting jig set, lifting device, and lifting method of the present invention will be described with reference to the drawings.

1. Lifting device First, the lifting device of the present invention will be described. Note that the lifting device of the present invention includes the hoisting jig set of the present invention, and the hoisting jig set of the present invention includes the hoisting jig of the present invention, so the hoisting jig and the hoisting jig set of the present invention will also be described in the description of the lifting device of the present invention. The lifting method of the present invention is a method of lifting and lowering a load using the lifting device of the present invention, so the lifting device of the present invention will be described first, and then the lifting method of the present invention will be described.

(Hanging jig)
FIG. 1 is a side view showing the hoisting jig 100 of the present invention, where (a) shows the state where the lower end is on the ground, and (b) shows the state where it is lifted up. As shown in this figure, the hoisting jig 100 of the present invention is composed of a gripping body 110, an auxiliary body 120, and an upper connecting body 130, and the gripping body 110 is further composed of a left gripping arm 110L and a right gripping arm 110R, and the auxiliary body 120 is composed of a left auxiliary arm 120L and a right auxiliary arm 120R. The left auxiliary arm 120L and the right auxiliary arm 120R can be rod-shaped members using steel rods or plate-shaped members using steel plates or the like. The upper connecting body 130 can be a plate-shaped member using steel plates or the like, or a box-shaped member combining steel plates or the like.

As shown in FIG. 1, the right end of the left gripping arm 110L and the left end of the right gripping arm 110R are hinged. In addition, the left end of the left gripping arm 110L and one end (the lower end in the figure) of the left auxiliary arm 120L are hinged, and the right end of the right gripping arm 110R and one end (the lower end in the figure) of the right auxiliary arm 120R are hinged. In addition, the other end (the upper end in the figure) of the left auxiliary arm 120L is hinged to the upper connector 130, and the other end (the upper end in the figure) of the right auxiliary arm 120R is hinged to the upper connector 130.

Because the hoisting jig 100 is thus a multi-joint link mechanism, when the upper connector 130 is lowered with its lower ends (the right end of the left gripping arm 110L and the left end of the right gripping arm 110R) in contact with the ground as shown in FIG. 1(a), the left gripping arm 110L and the left auxiliary arm 120L, and the right gripping arm 110R and the right auxiliary arm 120R are folded, respectively, and the angle formed by the left gripping arm 110L and the right gripping arm 110R increases. On the other hand, when the upper connector 130 is raised and the hoisting jig 100 is suspended in mid-air as shown in FIG. 1(b), the left gripping arm 110L and the left auxiliary arm 120L, and the right gripping arm 110R and the right auxiliary arm 120R extend, respectively, and the angle formed by the left gripping arm 110L and the right gripping arm 110R decreases, and the left gripping arm 110L and the right gripping arm 110R approach each other. In other words, by bringing the left gripping arm 110L and the right gripping arm 110R closer together (as shown in FIG. 1(b)), a part of the hoisting jig 100 can be engaged with a part of the load to grip the load, and by increasing the included angle formed by the left gripping arm 110L and the right gripping arm 110R (as shown in FIG. 1(a)), the grip on the load can be released.

2 shows an example of the gripper 110, where (a) is a side view and (b) is a plan view from above. The left gripping arm 110L and the right gripping arm 110R of the gripper 110 shown in this figure are each composed of two plate-like members arranged approximately parallel (including parallel), and as shown in FIG. 2(b), one (upper in FIG. 2(b)) of the left gripping arm 110L (plate-like member) and the right gripping arm 110R (plate-like member) are hinged by a central pin 114, and the other (lower in FIG. 2(b)) of the left gripping arm 110L (plate-like member) and the right gripping arm 110R (plate-like member) are hinged by a central pin 114.

A left arm pin 113L is provided on the left side of the left gripping arm 110L, and a right arm pin 113R is provided on the right side of the right gripping arm 110R. The left gripping arm 110L and the left auxiliary arm 120L are hinged together using the left arm pin 113L, and the right gripping arm 110R and the right auxiliary arm 120R are hinged together using the right arm pin 113R.

As shown in FIG. 2(b), an insertion space 140 through which part of the suspended load passes is formed near the joint between the left gripping arm 110L and the right gripping arm 110R of the gripping body 110. In other words, with part of the suspended load passing through this insertion space 140, the left gripping arm 110L and the right gripping arm 110R are brought closer together (FIG. 1(b)), thereby engaging part of the hoisting jig 100 with part of the suspended load.

The gripping body 110 can also be provided with an engagement body for engaging with a part of the suspended load. In FIG. 2, the left engagement body 150L is fixed to the middle position of the left gripping arm 110L, and the right engagement body 150R is fixed to the middle position of the right gripping arm 110R. The left engagement body 150L and the right engagement body 150R can be columnar or tubular members such as cylinders or square columns, and can also be roller structures that can rotate around an axis.

Figure 3 is a side view that shows a schematic diagram of a situation in which a plate material SL, such as a steel deck plate of a bridge, is lifted using a lifting jig 100 equipped with fittings (right fitting 150R and left fitting 150L). The plate material SL shown in this figure has a protrusion on its upper surface, and a fitting groove is formed in part of the protrusion. In this case, when the left gripping arm 110L and the right gripping arm 110R are brought close together with the protrusion passing through the insertion space 140, the left fitting 150L and the right fitting 150R, respectively, fit into the fitting grooves of the protrusions, thereby enabling the gripping body 110 to securely grip the plate material SL.

As shown in FIG. 4, the gripping body 110 may be configured such that the left gripping arm 110L and the right gripping arm 110R are formed of two members (a first gripping arm and a second gripping arm). The left gripping arm 110L shown in this figure is formed of a first left gripping arm 111L and a second left gripping arm 112L, and the first left gripping arm 111L and the second left gripping arm 112L are each composed of two plate-like members arranged approximately parallel (including parallel). Similarly, the right gripping arm 110R is also formed of a first right gripping arm 111R and a second right gripping arm 112R, and the first right gripping arm 111R and the second right gripping arm 112R are each composed of two plate-like members arranged approximately parallel (including parallel).

In the left gripping arm 110L shown in FIG. 4, like the gripping body 110 shown in FIG. 2, one (upper in FIG. 4(b)) first left gripping arm 111L (plate-shaped member) and the first right gripping arm 111R (plate-shaped member) are hinged by a central pin 114, and the other (lower in FIG. 4(b)) first left gripping arm 111L (plate-shaped member) and the first right gripping arm 111R (plate-shaped member) are hinged by a central pin 114. In addition, a left arm pin 113L is provided on the left side of the second left gripping arm 112L, and a right arm pin 113R is provided on the right side of the second right gripping arm 112R, and an insertion space 140 is formed in the gripping body 110 near the connection between the first left gripping arm 111L and the first right gripping arm 111R.

In addition, the left side gripping arm 110L shown in Figure 4 is hinged to one side (the upper side in Figure 4(b)) of the first left side gripping arm 111L (plate-shaped member) and the second left side gripping arm 112L (plate-shaped member) by the left side fitting 150L, and the other side (the lower side in Figure 4(b)) of the first left side gripping arm 111L (plate-shaped member) and the second left side gripping arm 112L (plate-shaped member) are hinged to the left side fitting 150L. Similarly, the right gripping arm 110R has one (upper in FIG. 4(b)) first right gripping arm 111R (plate-like member) and second right gripping arm 112R (plate-like member) hinged by the right fitting body 150R, and the other (lower in FIG. 4(b)) first right gripping arm 111R (plate-like member) and second right gripping arm 112R (plate-like member) hinged by the right fitting body 150R. In other words, the left fitting body 150L and right fitting body 150R shown in FIG. 4 have both the function of a hinge pin and the locking function of fitting into, for example, a fitting groove of a suspended load.

(Hanging jig set)
As described above, the hoisting jig set of the present invention includes the hoisting jig 100 of the present invention, and more specifically, includes the hoisting jig 100 and a locking body 200. Fig. 5 is a side view showing a schematic diagram of a state in which a plate material SL such as a steel deck of a bridge is hoisted using the hoisting jig set of the present invention, where (a) is a cross-sectional view showing the locking body 200 with the TH inserted into a through hole provided in the plate material SL, and (b) is a cross-sectional view showing the locking body 200 held by the hoisting jig 100.

As shown in FIG. 5, the locking body 200 is equipped with a head protrusion 210, a lower stopper 220, and a main body 230, and has a structure in which the head protrusion 210 is provided at one end (the upper end in the figure) of the rod-shaped (or cylindrical) main body 230, and the lower stopper 220 is provided at the other end (the lower end in the figure). In addition, a fitting groove 211 is formed in part of the head protrusion 210, into which the fitting body (left fitting body 150L or right fitting body 150R) of the hanging jig 100 fits. Below, the procedure for gripping the plate material SL using the hanging jig set of the present invention will be described with reference to FIG. 5.

As shown in FIG. 5(a), the locking body 200 is inserted into a through hole TH provided in the plate material SL. At this time, the locking body 200 is inserted in a position in which the head protrusion 210 is above the plate material SL and the lower stopper 220 is below the plate material SL. The locking body 200 can be always inserted into the through hole TH so that it cannot be removed from the plate material SL, or it can be inserted into the through hole TH so that it can be removed. For example, the lower stopper 220 has a shape and dimensions that do not allow it to pass through the through hole TH, but the head protrusion 210 can have a shape and dimensions that allow it to pass through the through hole TH, making it removable from the through hole TH. Alternatively, the head protrusion 210 (or the lower stopper 220) can be configured to be detachably attached to the main body 230 using screws or the like, making it removable from the through hole TH.

When the locking body 200 is inserted into the through hole TH, the head protrusion 210 is pushed slightly upward, and the hoisting jig 100, which is connected to a wire rope of a hoisting means such as a winch or hoist, is lowered close to the plate material SL. At this time, the hoisting jig 100 is lowered so that the head protrusion 210 of the locking body 200 is inserted into the insertion space 140 of the hoisting jig 100. Alternatively, the head protrusion 210 may be pushed upward with the hoisting jig 100 in contact with the plate material SL, and the head protrusion 210 may be inserted into the insertion space 140.

When the head projection 210 is inserted into the suspension insertion space 140, the upper connector 130 is lifted while the wire rope is wound up by the winding means, the left gripping arm 110L and the right gripping arm 110R are brought closer together, and the left fitting body 150L and the right fitting body 150R are fitted into the fitting groove 211. This allows the lifting jig 100 to securely grip the locking body 200. Furthermore, when the upper connector 130 is lifted while the wire rope is wound up by the winding means, the lower stopper 220, which cannot pass through the through hole TH, abuts against the underside of the plate material SL, and the plate material SL is supported by the lower stopper 220 from its underside. In other words, the lifting jig 100 can grip the plate material SL via the locking body 200, and therefore the plate material SL can be raised and lowered by the winding means.

(Lifting device)
The lifting device of the present invention is capable of lifting and lowering planar objects whose planar dimensions (large surface area) are superior to their thickness dimensions, such as the steel deck of a bridge or the field of a stadium.

The Sports Agency provides financial support for the formulation of development plans for stadiums and arenas through public-private partnerships, and is promoting the development of multi-functional and complex facilities that can host events other than sports on a regular basis, with an emphasis on the perspective of "profitability." In this context, a two-layered stadium consisting of a field (e.g., a grass field) and a concrete floor for events has been proposed. For example, when soccer or other events are held, the field is placed at ground level, while when concerts or other events are held, the field is lifted up to the roof height and the event floor is used. The technology for raising and lowering the field in this way makes it possible to realize facilities that "profitability" can be realized, and it is expected that the demand for such technology will increase in the future. Therefore, the lifting device of the present invention will be explained here using an example of raising and lowering a field FD (i.e., a planar body) as shown in FIG. 6.

As described above, the lifting device 300 of the present invention is configured to include the lifting jig set (lifting jig 100 and engaging body 200) of the present invention, and further includes a ceiling body 310, a lifting body 320, and a hoisting means (not shown) as shown in FIG. 7(a). FIG. 7(a) is a side view showing the lifting device 300 of the present invention, and FIG. 7(b) is a plan view showing the arrangement of through holes TH provided in the competition field FD (planar body). The hoisting means includes a drum, a power source for rotating the drum, and a wire rope WR that is wound (or unwound) by the drum, and may be a specially manufactured product, or a winch or hoist available on the market may be used.

The ceiling body 310 constituting the lifting device 300 is arranged above the competition field FD, and is arranged so as to cover the entire competition field FD in a plan view. For example, the ceiling body 310 can be a planar (plate-like) structure that covers the entire competition field FD, or multiple beam-like ceiling bodies 310 can be arranged in parallel to cover the entire competition field FD. When the ceiling body 310 is a beam-like structure, it can be a structure consisting of a beam-like lower chord and an arch-like upper chord as shown in FIG. 7(a), or depending on the area (weight) of the competition field FD, it can be a structure consisting of only the lower chord. Furthermore, the lower chord can be of various structures such as a normal truss structure, and the wires that suspend the lower chords can be arranged in various ways, such as a cross-type (X-type) rather than a vertical parallel arrangement.

The lifting body 320 is a long shaft member whose shaft dimension is greater than its cross-sectional dimension, and can be constructed by combining two channel steels, or by using other long materials such as H-shaped steel, angle steel, or steel pipes. While the ceiling body 310 is fixed so that it cannot move up or down, the lifting body 320 moves up and down in response to the operation of the hoisting means. For example, the hoisting means is installed on the ceiling body 310, and the lifting body 320 is attached to the tip (lower end) of the hanging wire rope WR, and the lifting body 320 can be hoisted by winding up the wire rope WR with the hoisting means, and can be lowered by unwinding the wire rope WR.

The lifting jig 100 of the present invention is attached below the lifting body 320. FIG. 8 is a side view showing the lifting jig 100 attached to the lifting body 320. The lifting body 320 shown in this figure is formed of a beam body 321 and a hanging member 322, and the hanging member 322, which is oriented approximately vertically (including vertically), is fixed to the underside of the beam body 321. As described above, the beam body 321 can be formed using a channel steel or H-shaped steel, while the hanging member 322 can be formed using a steel bar (e.g., reinforcing bar). The lifting jig 100 is attached to the lower end of the hanging member 322 with the upper connector 130 facing upward as shown in FIG. 8.

As shown in FIG. 7(b), the competition field FD is provided with a number of through holes TH. For example, in this figure, when viewed horizontally as one row, six rows of nine through holes TH are arranged, meaning that 54 (9 x 6) through holes TH are provided. The hoisting fixtures 100 are also arranged in positions facing (opposing) the through holes TH so as to cover the entire competition field FD. For example, in the case of FIG. 7, six rows of lifting bodies 320 are arranged to match the through holes TH of the competition field FD, and nine lifting fixtures 100 are attached to each of the lifting bodies 320.

As shown in FIG. 9, the locking body 200 is inserted into each through hole TH so that the head protrusion 210 is at the top and the lower stopper 220 is at the bottom. The through hole TH shown in this figure is provided with a casing CS that protects the hole wall, and the locking body 200 is provided with an inner cannula 240 with a smaller diameter than the casing CS, that is, the inner cannula 240 is structured to slide up and down within the casing CS. Furthermore, this inner cannula 240 can also be a telescopic (registered trademark) pick mechanism.

Also, grass is placed on top of the head protrusion 210 shown in this figure. As a result, when playing a game, the grass on the head protrusion 210 can be made the same height as the other grass by pushing down the locking body 200 and storing it in the through hole TH as shown in FIG. 9(a). On the other hand, when lifting the competition field FD, that is, when the locking body 200 is gripped by the lifting jig 100, the locking body 200 is pushed up as shown in FIG. 9(b) to make the head protrusion 210 protrude from the competition field FD, bringing the left gripping arm 110L and the right gripping arm 110R closer to each other, and fitting the left fitting body 150L and the right fitting body 150R into the fitting groove 211.

A typical soccer field is nearly 100m wide, which means it has a considerable weight, so when the playing field FD is lifted, the lifting body 320 (beam body 321) "deflects." The amount of deflection of the lifting body 320 (beam body 321) increases as it approaches the center, and decreases as it approaches the ends.

On the other hand, when the competition field FD is lifted, the left gripping arm 110L and the right gripping arm 110R are closest to each other as shown in FIG. 8, and the angle formed by the left gripping arm 110L and the right gripping arm 110R is the smallest, meaning that the vertical dimension of the lifting jig 100 is the longest. For convenience, the length determined based on the length of the left gripping arm 110L and the length of the left auxiliary arm 120L (or the length of the right gripping arm 110R and the length of the right auxiliary arm 120R) as shown in FIG. 8 will be referred to as the "arm length" here.

Here, when the competition field FD is lifted up to the height of the main roof for holding a concert or the like, if the competition field FD is deflected by its own weight, the competition field FD will have a downward convex shape in side view, i.e., rainwater and other water will accumulate in the center. If water accumulates on the competition field FD, the grass soaked in water may rot at the roots, and the weight of the suspended load will increase by the amount of accumulated water, which will result in unnecessarily large equipment. Therefore, as shown in FIG. 10, the length of the hanging material 322 is the same, but the hanging jig 100 should be attached with a shorter arm length as it approaches the center of the beam body 321, and with a longer arm length as it approaches the end of the beam body 321. As a result, the competition field FD will have an upward convex shape in side view, i.e., the competition field FD will have a shape that slopes downward from the center to both ends, and as a result, rainwater and other water will be discharged outside the competition field FD. Therefore, it is advisable to plan the shape of the competition field FD when it is lifted (the shape of the upward protrusion), and then set the arm length of each of the lifting jigs 100 so that this shape is formed. At this time, the shape of the competition field FD is planned so that at least rainwater, etc., is drained outside the competition field FD.

2. Lifting Method Next, the lifting method of the present invention will be described with reference to the drawings. Note that the lifting method of the present invention is a method for lifting and lowering a suspended load using the lifting device 300 described so far, and therefore, we will avoid any overlapping description with the description of the lifting device 300 and only describe the content unique to the lifting method of the present invention. In other words, the content not described here is the same as that described in "1. Lifting Device".

(Hoisting)
Fig. 11 is a flow diagram showing the main steps of the lifting method of the present invention when lifting a load, and Fig. 12 is a step diagram thereof. First, as shown in Fig. 12(a), preparations for the lifting work are made, such as lowering the lifting jig 100 to the vicinity of the playing field FD by unwinding the wire rope WR with the hoisting means (Step 101 in Fig. 11).

Next, as shown in FIG. 12(b), the lower end of the hoisting jig 100 is placed on the playing field FD, and the hoisting jig 100 is further lowered to widen the angle formed by the left gripping arm 110L and the right gripping arm 110R. Then, as shown in FIG. 12(c), the left gripping arm 110L and the right gripping arm 110R are placed on the playing field FD, and the angle formed by the left gripping arm 110L and the right gripping arm 110R is set to approximately 180°.

When the left gripping arm 110L and the right gripping arm 110R are placed on the playing field FD, as shown in FIG. 12(d), the locking body 200 inserted into the through hole TH of the playing field FD is pushed upward, and the head protrusion body 210 is inserted into the insertion space 140 (Step 102 in FIG. 11).

When the head projection 210 is inserted into the insertion space 140, as shown in FIG. 12(e), the upper connector 130 is lifted while the wire rope is being wound up by the winding means, the left gripping arm 110L and the right gripping arm 110R are brought closer together, and the left fitting body 150L and the right fitting body 150R are fitted into the fitting groove 211 (Step 103 in FIG. 11). This allows the locking body 200 to be securely gripped by the lifting jig 100. Furthermore, as shown in FIG. 12(f), when the upper connector 130 is lifted while the wire rope is being wound up by the winding means, the plate material SL is supported by the lower stopper 220 from its underside, that is, the lifting jig 100 grips the plate material SL via the locking body 200 while lifting the plate material SL by the winding means (Step 104 in FIG. 11).

(Hanging)
Fig. 13 is a flow diagram showing the main steps of the lifting method of the present invention when lowering a load, and Fig. 14 is a step diagram thereof. First, as shown in Fig. 14(a), the hoisting jig 100 holds the plate material SL via the locking body 200, and the wire rope WR is unwound by the hoisting means to suspend the sport field FD (Step 201 in Fig. 13). Then, the sport field FD is placed in a predetermined position (for example, ground level) (Step 202 in Fig. 13).

When the competition field FD is placed in the designated position, as shown in FIG. 14(b), the lower end of the hoisting jig 100 is placed on the competition field FD, and the hoisting jig 100 is further lowered to widen the angle formed by the left gripping arm 110L and the right gripping arm 110R. Then, as shown in FIG. 14(c), the left gripping arm 110L and the right gripping arm 110R are placed on the competition field FD, and the angle formed by the left gripping arm 110L and the right gripping arm 110R is set to approximately 180°, thereby releasing the grip of the locking body 200 by the hoisting jig 100 (Step 203 in FIG. 13).

When the grip of the locking body 200 by the hoisting jig 100 is released, as shown in FIG. 14(d), the head protrusion 210 is pushed downward, the locking body 200 is housed in the through hole TH, and the height of the grass above the head protrusion 210 is aligned with the height of the other grass (Step 204 in FIG. 13). Finally, the hoisting jig 100 is hoisted by winding up the wire rope WR with the hoisting means, opening up the space above the playing field FD.

The lifting jig, lifting jig set, lifting device, and lifting method of the present invention can be used for a variety of loads, and are particularly effective for planar loads with a relatively large surface area, such as bridge deck plates and stadium fields.

100 Lifting jig of the present invention 110 Gripper (of lifting jig) 110L Left gripping arm (of gripping body) 111L First left gripping arm (of left gripping arm) 112L Second left gripping arm (of left gripping arm) 110R Right gripping arm (of gripping body) 111R First right gripping arm (of right gripping arm) 112R Second right gripping arm (of right gripping arm) 113L Left arm pin (of gripping body) 113R Right arm pin (of gripping body) 114 Central pin (of gripping body) 120 Auxiliary body (of lifting jig) 120L Left auxiliary arm (of auxiliary body) 120R Right auxiliary arm (of auxiliary body) 130 Upper connecting body (of lifting jig) 140 Insertion space (of lifting jig) 150L Left fitting body (of the lifting jig) 150R Right fitting body (of the lifting jig) 200 Locking body (of the lifting jig set of the present invention) 210 Head protrusion (of the locking body) 211 Fitting groove (of the head protrusion) 220 Lower stopper (of the locking body) 230 Main body (of the locking body) 240 Inner tube (of the locking body) 300 Lifting device of the present invention 310 Ceiling body (of the lifting device) 320 Lifting body (of the lifting device) 321 Beam body (of the lifting body) 322 Hanging material (of the lifting body) CS Casing FD Competition field SL Plate material TH Through hole WR Wire rope

Claims (6)

A gripping body including a left gripping arm and a right gripping arm;
An auxiliary body including a left auxiliary arm and a right auxiliary arm;
An upper connector,
The left gripping arm includes a first left gripping arm and a second left gripping arm that are hinged to each other,
The right gripping arm includes a first right gripping arm and a second right gripping arm that are hinged to each other,
a right end of the first left gripping arm and a left end of the first right gripping arm are hinged to each other;
a left end of the second left gripping arm and one end of the left auxiliary arm are hinged together, and a right end of the second right gripping arm and one end of the right auxiliary arm are hinged together,
the other end of the left auxiliary arm is hinged to the upper connector, and the other end of the right auxiliary arm is hinged to the upper connector;
A left fitting body is provided on the left gripping arm, and a right fitting body is provided on the right gripping arm,
the left fitting body is a left pin that hinges the first left gripping arm and the second left gripping arm,
the right fitting body is a right pin that hinges the first right gripping arm and the second right gripping arm,
The gripping body is formed with an insertion space through which a part of the suspended load can be inserted,
When the upper connector is raised with the upper connector facing upward, the angle formed by the left gripping arm and the right gripping arm becomes smaller, and a part of the gripping body is engaged with a part of the load inserted into the insertion space ,
The left fitting body and the right fitting body can be fitted into fitting grooves provided in a part of the suspended load .
A lifting jig characterized by the above. A lifting jig including a gripping body including a left gripping arm and a right gripping arm, an auxiliary body including a left auxiliary arm and a right auxiliary arm, and an upper connecting body;
a head projection having a fitting groove and a lower stopper;
The right end of the left gripping arm and the left end of the right gripping arm are hinged to each other,
a left end of the left gripping arm and one end of the left auxiliary arm are hinged together, and a right end of the right gripping arm and one end of the right auxiliary arm are hinged together,
the other end of the left auxiliary arm is hinged to the upper connector, and the other end of the right auxiliary arm is hinged to the upper connector;
The gripping body is provided with an insertion space through which the head projection can be inserted,
the left grip arm is provided with a left fitting body that can be fitted into the fitting groove, and the right grip arm is provided with a right fitting body that can be fitted into the fitting groove,
When the upper connector is raised with the upper connector facing upward, the angle formed by the left gripping arm and the right gripping arm becomes smaller, and the left fitting body and the right fitting body are fitted into the fitting groove of the head protruding body inserted into the insertion space, whereby the locking body is locked to the hanging jig,
The locking body is inserted into a through hole provided in the suspended load with the lower stopper facing downward, and is locked to the hoisting jig, and the lower stopper supports the suspended load from below, so that the hoisting jig can grasp the suspended load via the locking body.
A lifting jig set characterized by the above. In a lifting device for lifting and lowering a sheet-like object whose planar dimensions are excellent relative to its wall thickness,
The lifting jig set according to claim 2 ,
A ceiling body disposed above the planar body;
A lifting body that is disposed below the ceiling body and is movable up and down;
a hoisting means fixed to the ceiling body and for raising and lowering the lifting body,
The hoisting jig is attached to the lifting body with the upper connector facing upward, and a plurality of the hoisting jigs are arranged to cover the planar body in a planar manner,
The through hole is provided in the planar body at a position facing the hanging jig,
The locking bodies inserted into the respective through holes with the lower stoppers facing downward are locked to the hoisting jig, and the lower stoppers support the planar body from below, so that the planar body held in a planar manner by the multiple hoisting jigs can be raised and lowered by the hoisting means.
A lifting device characterized by: The arm length determined by the length of the left gripping arm and the length of the left auxiliary arm, or the length of the right gripping arm and the length of the right auxiliary arm, is different for each of the hoisting jigs,
The hanging jig is attached with an arm length shorter as it approaches the center of the lifting body, and the hanging jig is attached with an arm length longer as it approaches the end of the lifting body, so that when the planar body is lifted, the slope is downward from the center to both ends.
4. The lifting device according to claim 3 . 5. A method for lifting and lowering the sheet -like object having a planar dimension larger than a wall thickness dimension by using the lifting device according to claim 3 or 4 ,
a locking body protruding step of protruding a part of the locking body, which is inserted into the through hole with the lower stopper facing downward, above the planar body;
a locking step of locking a portion of the locking body protruding from the planar body and inserted into the insertion space to the hanging jig;
A lifting process for lifting the planar body gripped by the plurality of lifting jigs by lifting the lifting body by the hoisting means,
In the locking step, the lifting body is pulled up by the hoisting means to reduce the included angle between the left gripping arm and the right gripping arm, and the left fitting body and the right fitting body are fitted into the fitting groove of the head protruding body inserted into the insertion space, thereby locking the locking body to the hanging jig.
A lifting method comprising: The method further includes a suspending step of suspending the planar body that is planarly held by the plurality of suspending jigs by lowering the lifting body by the hoisting means,
In the suspending process, the lifting body is lowered even after the planar body is placed on the ground, thereby increasing the included angle between the left gripping arm and the right gripping arm, and the locking of the locking body by the suspending jig is released.
6. The method for lifting and lowering according to claim 5 .

Images