JP3561751B2 - Lifting equipment for concrete products - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device used when lifting a concrete product produced in a factory for transportation or installation.
[0002]
[Prior art]
Many of the various concrete products that have been formed to predetermined dimensions and shapes at factories have weights that are extremely difficult or impossible to lift by human power.
[0003]
When transporting such a concrete product in a factory or a construction site, or at the time of construction, it must be lifted by using a heavy machine such as a crane or a winch.
[0004]
Conventionally, when molding a concrete product, a cap nut-shaped insert is embedded so that the base end of the insert is exposed on the surface of the concrete product. In general, an upper tool is attached, and the lifting tool is connected to a heavy machine and lifted.
[0005]
The inserts are buried in two or more places at such a position that the load can be balanced during lifting.For example, when moving in a factory or loading / unloading on a transport vehicle, furthermore, at the time of construction, each concrete For the product, eyebolts had to be manually screwed into and removed from a plurality of inserts, which was extremely troublesome. Especially on large sites handling a large number of concrete products, such work has hindered efficiency.
[0006]
Therefore, as shown in FIG. 5, the applicant of the present invention can very easily and quickly attach and detach a fixing member embedded in a concrete product and a hanging member to which a rope or the like is attached, as shown in FIG. Lifting equipment has been proposed.
[0007]
That is, the lifting device is configured such that the fixing member 61 embedded in the concrete product is inserted into the insertion hole 62 whose base end is open and whose end is closed, and along one side surface of the insertion hole 62 in the axial direction over its entire length. And a locking groove 64 extending in the circumferential direction along the outer periphery of the insertion hole 62 from the tip of the guide groove 63, and the hanging member 51 for attaching the lifting tool is fitted into the guide groove 63. A shaft 52 is inserted into the insertion hole 62 by projecting the stopper projection 53 to one side of the distal end, and is deflected outward in a different phase from the locking projection 53 to protrude from the base end of the shaft 52. And a ring 54 for hooking a lifting tool.
[0008]
When such a lifting device is used, the locking projection 53 of the hanging member 51 is fitted into the guide groove 63, and the shaft portion 52 is inserted into the insertion hole 62. By fitting the projection 53 into the locking groove 64, the hanging member 51 can be easily attached. In addition, the suspension member 51 can be removed only by pulling out after turning in the opposite direction.
[0009]
At this time, the guide grooves 63 of the fixing member 61 are buried in the concrete product so as to face each other or in parallel and in opposite directions, so that when the ropes are connected and lifted, they are fitted into the locking grooves 64. The locking projection 53 acts as a retaining member, and can be lifted safely.
[0010]
[Problems to be solved by the invention]
However, depending on the type, use, or location of the concrete product, it may be left in a state of being exposed to the weather without covering with a curing sheet, etc. during storage, during which foreign substances such as gravel and mud are contaminated. In some cases, the toner enters the insertion hole 62 and the guide groove 63 of the fixing member 61 and becomes blocked. In such a case, since the hanging member 51 cannot be fixed, the foreign matter must be removed. However, it is extremely troublesome or impossible to remove the mud or the like that has entered the fixing member 61. There was a problem.
[0011]
[Means for Solving the Problems]
Therefore, the present invention provides a fixing member having an insertion hole whose base end is open, a guide groove extending in the axial direction from the base end along one side surface of the insertion hole, and a locking projection fitted into the guide groove. The hook is projected from the base end of the shank by projecting outward at a different phase from the shank and the locking projection inserted into the insertion hole. The end of the insertion hole and the guide groove are closed and the end is closed near the bottom of the hole, and the shaft is rotated near the bottom of the hole. A deep hole is provided, and a concave portion capable of locking the locking projection is provided on the top surface of the deep hole, and the deep hole has a length substantially equal to its total height and a small diameter side edge. interpolation spring member for pressing the shaft proximally becomes small diameter of the conical compression coil spring than the insertion hole is toward the small diameter side edge in the insertion hole It has a configuration that is.
[0012]
The hanging protrusion of the suspending member is fitted into the guide groove, the shaft is inserted into the insertion hole of the fixing member, and the spring is compressed to the base end of the shaft while being compressed. The pressing force is released when the locking projection reaches the position of the recess. Then, the shaft portion is pressed in the proximal direction by the restoring force of the spring, so that the suspension member is fixed in a state where the locking projection is fitted in the concave portion, and the suspension member rotates when the lifting tool is attached to rotate the shaft portion. Does not come off the fixing member.
[0013]
In addition, even if gravel or mud gets into the fixing member, it accumulates in the space near the bottom of the deep hole, so that the insertion hole, the guide groove, and even the concave portion are not clogged, so that the fixing of the suspension member Will not interfere with
[0014]
Here, by providing the flange-like expanded diameter portion near the tip of the embodiment when the fixing member of the present invention, the fixing member may be a missing difficulty casting of concrete products.
[0015]
Alternatively, it provided a recess for the lid to the base end of the fixing member, by providing a lid that fits into it, it is possible to cast such impair the appearance after construction.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0017]
FIGS. 1 and 2 show an example of an embodiment of the present invention. In a suspension member 1 shown in FIGS. 1 and 2A, a locking projection 3 projects from one side of a tip end. The shaft portion 2 is provided and has a screw rod 4 integrally at the base end, and a ring body 5 erected on one side of a base 8 having a screw hole 7. The threaded rod 4 is screwed into the screw hole 7 so that the locking projection 3 and the ring 5 project to the opposite sides of the shaft portion 2, and the rope is inserted into the through hole 6 of the ring 5. And the like, and are connected by inserting a lifting tool such as a lifting tool.
[0018]
Next, the fixing member 11 shown in FIGS. 1 and 2 (B) has a cylindrical main body 12 having a flange-shaped enlarged diameter portion 13 at a tip end thereof and a depression 17 at a tip end surface. And a plug 18 having a deep hole 19 formed in the recess 17 and formed concentrically with the central axis of the main body 12 after the fitting.
[0019]
The main body 12 has an insertion hole 14 having substantially the same diameter as the shaft portion 2 formed concentrically with the center axis thereof, and a locking projection 3 extending in the axial direction from a base end provided on one side surface of the insertion hole 14. Have guide grooves 15 that can be fitted therein, all of which penetrate the main body 12. A recess 17 into which the plug 18 is fitted is formed with the distal end of the insertion hole 14 and the guide groove 15 as a bottom surface, and by fitting the plug 18 into the recess 17, the insertion hole 14 and The tip of the guide groove 15 continues to the inner hole 19.
[0020]
Further, a concave portion 16 communicating with the insertion hole 14 and extending in the radial direction is provided on the bottom surface of the recess 17 so that the locking projection 3 can be locked. The concave portion 16 is provided at a position where the locking projection 3 is fitted after rotating the shaft portion 2 inserted into the insertion hole 14 by a predetermined angle, and in FIG. 1 and FIG. It is provided in the position of.
[0021]
The back hole 19 provided in the plug 18 has a closed end, a diameter such that the shaft portion 2 can rotate together with the locking projection 3, and a height at which a foreign substance such as mud enters. At this time, the height is set so as not to accumulate near the bottom of the hole and to hinder rotation and fixing of the suspension member 1. In the back hole 19, a spring body 20 formed of a conical compression coil spring having a length substantially equal to the entire height and having a small-diameter side edge smaller than the insertion hole 14 is inserted into the small-diameter side edge. And presses the fitted shaft portion 2 in the proximal direction.
[0022]
When the concrete member is molded at a factory, the fixing member 11 is cast by placing the base end surface of the fixing member 11 in contact with the inner surface of the mold to cast concrete. It will be embedded with the base end face exposed on the surface of the product.
[0023]
The embedding of the fixing member 11 is determined in such a position and number as to balance the weight when the concrete product is lifted, and is usually two or more. Then, as shown in FIG. 3, the required number of fixing members 1 is embedded in the concrete product 10 with the phase determined so that the guide grooves 15 are parallel to each other and go in opposite directions. Generally, it is often installed at two places as shown in FIG. 3 and suspended therefrom through a rope.
[0024]
Hereinafter, a procedure for lifting a concrete product using the hanging members of FIGS. 1 and 2 will be described.
[0025]
Prior to lifting, the hanging member 1 is fixed to the fixing member 11. First, the locking projection 3 of the suspension member 1 is fitted into the guide groove 15 and the shaft 2 is inserted into the insertion hole 14, and further pressed even after the tip of the shaft 2 reaches the spring body 20. Then, after fully inserting the shaft portion 2 to the proximal end, the shaft portion 2 is rotated by about 90 degrees, the locking projection 3 is aligned with the position of the concave portion 16, and the force for pressing the shaft portion 2 in the distal direction is released. The shaft 2 is pushed back in the proximal direction by the restoring force of the body 20, and the locking projection 3 is fitted into the recess 16. The suspension member 1 coupled to the fixing member 11 in this manner vibrates or moves when the rope or the like is coupled to the ring body 5 or during a lifting operation. Since the state in which the locking projection 3 is pressed and held in the recess 16 is maintained, it does not rotate to be displaced or disengaged.
[0026]
Further, even if foreign matter such as mud is contained in the fixing member 11, the foreign matter such as mud is collected in a space near the bottom of the deep hole 19, so that the insertion hole 14, the guide groove 15, and the concave portion 16 are not clogged. There is no problem in fixing the member 1.
[0027]
Next, as shown in FIG. 3, both ends of the rope R are inserted and connected to the ring body 5, and the hook F of the crane is hung at the intermediate point of the rope R, lifted, and moved to a predetermined place. At this time, an oblique force P in the same direction as the rope R acts on the suspension member 1, but the locking projection 3 is fitted in the concave portion 16 and receives the force Py in the axial direction of the shaft portion 2, that is, in the pull-out direction. At the same time, the shaft portion 2 is fitted into the insertion hole 14 and receives a force Px in the radial direction, that is, in the direction of lateral displacement.
[0028]
Then, after the concrete product is lowered to a predetermined place, the rope R is removed, and the suspension member 1 is turned in the direction opposite to that at the time of attachment while pressing the suspension member 1 in the tip direction against the pressing force of the spring body 20. Then, the locking projection 3 is aligned with the guide groove 15, and is pulled out and separated from the fixing member 11. Thus, a series of lifting operations is completed.
[0029]
The base end surface of the fixing member 11 is exposed on the surface of the concrete product after construction and may be left as it is. However, due to aesthetic problems, the base ends of the insertion hole 14 and the guide groove 15 are open. You may hate doing it. In such a case, as shown in FIG. 4, a recess 30 having a diameter larger than that of the base of the insertion hole 34 and the guide groove 35 is provided on the base end surface, and the lid 21 is fitted into the recess 30 so as to be sealed. The fixing member 31 having such a configuration is used. Then, by inserting the lid 21 after the construction, the insertion hole 34 and the guide groove 35 are closed, so that intrusion of rainwater, mud, and the like can be prevented, and the appearance can be improved.
[0030]
The cover 21 may be attached by fitting and pressing the recess 30, or may be formed by forming screws to be screwed to the cover 21 and the recess 30, respectively, and turning the screw. In addition, the lid 21 itself may have a function according to the use or location of the structure, for example, a light reflection function, or a component having a required function may be connected to the lid 21.
[0031]
Incidentally, the fixing members 11, 31 and the lid 21 are made of synthetic resin or metal, and the hanging member 1 is usually made of metal due to its strength. The shaft 2 and the ring 5 of the suspension member 1 or the main bodies 12, 32 of the fixing members 11, 31 and the plugs 18, 38 may be integrally formed. Further, the positions of the concave portions 16 and 36 of the fixing members 11 and 31 are not limited to the above example, and can be arbitrarily set at positions rotated by about 45 to 180 degrees from the guide grooves 15 and 35.
[0032]
【The invention's effect】
As described above, the suspension member is inserted into the fixing member embedded in the concrete product, and the suspension member is quickly rotated by a predetermined angle, and the suspension member is quickly rotated and removed in a very simple operation. Can be attached to and detached from the fixing member, which is useful for reducing the labor and efficiency of lifting work when handling a large number of concrete products.
[0033]
Further, by providing a deep hole in the fixing member to secure a space for foreign matter near the bottom of the hole, even if foreign matter such as gravel or mud enters during storage, the portion for inserting the suspending member does not become clogged. , Does not hinder the work.
[0034]
Furthermore, by inserting the spring body into the deep hole, the locking projection is fitted and fixed in the concave portion by the restoring force of the spring body, so that when the rope or the like is connected or during the lifting operation, the hanging member is removed from the fixing member. It does not come off, and is excellent in workability and safety, in particular, because the spring body is a conical compression coil spring .
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is a plan view of FIG.
FIG. 3 is an explanatory diagram showing a use state of FIG. 1;
FIG. 4 is a longitudinal sectional view showing another embodiment of the present invention.
FIG. 5 is a longitudinal sectional view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Suspension member, 2 shaft parts, 3 locking projections, 5 ring bodies, 11 fixing members, 14 insertion holes, 15 guide grooves, 16 concave portions, 17 inner holes, 18 top surface, 20 spring body

Claims (1)

A fixing member having an insertion hole whose base end is open, and a guide groove extending in the axial direction from the base end along one side surface of the insertion hole;
A shaft portion inserted into the insertion hole, which is provided with a locking protrusion fitted into the guide groove so as to protrude toward one side of the tip, and a shaft portion which is deflected outward in a different phase from the locking protrusion. A hanging member protruding from the base end and having a ring for hooking a lifting tool;
A deep hole is provided, which is continuous with the insertion hole and the tip of the guide groove, and has a space near the bottom of the hole where the tip is closed and foreign matter such as intruded mud is stored near the bottom of the hole so that the shaft can be rotated. A concave portion capable of locking the locking projection is provided on a top surface of the deep hole, and the deep hole has a length substantially equal to the entire height thereof, and a small-diameter side edge is smaller than the insertion hole. A spring body made of a small-diameter conical compression coil spring and pressing the shaft portion in the proximal direction is inserted with the small-diameter side edge directed toward the insertion hole ;
A lifting device for concrete products, characterized in that:

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