JP2021147127A - Lifting device of concrete product - Google Patents

Abstract

To provide a lifting device of a concrete product suitable for a system of lifting longitudinal both end parts of a concrete product, that is capable of lifting and rotating a concrete product with a simple structure without being mounted with hardware and the like for lifting the concrete product and flexibly coping with different sizes of concrete products without requiring any special device.SOLUTION: A lifting device for a concrete product includes a center horizontal member 1 with a length dimension longer than a length dimension of the concrete product and L-shaped members 2 arranged on both sides of the center horizontal member 1. The L-shaped member 2 includes a horizontal member 3 and a vertical member 4. The horizontal member 3 has a through hole for slidably engaging with the center horizontal member 1. The vertical member 4 has a convex insertion fitting 10 that can be inserted in a recessed part of the concrete product on its lower part. The insertion fittings 10 are arranged on both sides of the vertical member 4 along a longitudinal direction of the center horizontal member 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a lifting device used for transporting and reversing a secondary concrete product, for example, a prestressed concrete product manufactured in a formwork or the like after demolding to a temporary storage place or the like.

Conventionally, a passing member having a length dimension equal to or longer than the length of a secondary concrete product, a pair of wood-mouthed hooking members arranged in a facing manner, and both ends of the pair of wood-mouthed hooking members are attached. It is composed of a rope member made of concrete, and a pair of wood mouth hooking members are slidably combined with the passing member, and the wood mouth hooking member is added to the same place according to the wall thickness of the concrete secondary product wood mouth. There is known a hanging tool for secondary concrete products, which is equipped with a U-shaped side surface, an L-shaped hooking portion, and a lifting fulcrum member that can be hooked in such a state (hereinafter, "conventional technique 1"). For example, see Patent Document 1.).

Further, a hanging rod connected to the hanging tool, a horizontal member, a fixing tool movably attached to both ends of the horizontal member, a connecting rod and a supporting member connected to the fixing tool, and the support thereof. There is known a lifting and reversing jig for concrete products provided with an insertion rod attached to the tip of a member (hereinafter, referred to as "conventional technique 2", for example, see Patent Document 2).

Japanese Unexamined Patent Publication No. 7-2483 Jitsukaisho 60-56512 Gazette (full text)

However, in the prior art 1, when the secondary concrete product is inverted, it is necessary to invert the secondary concrete product while operating the lifting cord member, and there is a problem that the work requires skill and time. ..
Further, in the prior art 2, instead of lifting both ends of the concrete product in the longitudinal direction, a method of providing insertion holes on both side walls orthogonal to the longitudinal direction and inserting an insertion rod into the insertion holes to lift the concrete product. Therefore, when the length of the concrete product is large, there is a problem that the posture of the concrete product at the time of lifting is unstable and it is difficult to reverse the concrete product.

The present invention has been made to solve the problems of the prior art, and is suitable for a method of lifting both ends in the longitudinal direction of a concrete product, and the concrete product is equipped with hardware for lifting. It is an object of the present invention to provide a concrete product lifting device that can be lifted and rotated with a simple configuration and can flexibly handle different sizes of concrete products without requiring a special device. ..

In order to achieve the above object, the concrete product lifting device of the present invention is firstly arranged on both sides of a central horizontal member having a length dimension equal to or larger than the length dimension of the concrete product and the central horizontal member. Equipped with an L-shaped frame material
The L-shaped frame member is formed of a horizontal frame member and a vertical frame member, and the horizontal frame member has a through hole for slidably fitting to the central horizontal frame member, and the vertical frame member has a through hole. Has a convex insertion fitting that can be inserted into a recess of a concrete product at the lower portion thereof, and the insertion fitting is arranged on both sides of the vertical member so as to be along the longitudinal direction of the central horizontal member. It is characterized by being done.
According to this feature, it is possible to lift and rotate a concrete product with a simple structure without attaching hardware for lifting, and even if the size of the concrete product is different, no special device is required. , Can respond flexibly.

Secondly, in the first feature of the concrete product lifting device of the present invention, the central horizontal member and the horizontal member of the L-shaped frame are formed of a pipe having a square cross section. It is characterized by that.
According to this feature, since the central horizontal member and the horizontal member of the L-shaped frame, which are the main members, can be formed of a commercially available square pipe, the device can be provided at low cost. Further, since the size of the square pipe may be changed according to the weight of the concrete product to be lifted, it is possible to easily provide an apparatus suitable for various concrete products.

Further, in the concrete product lifting device of the present invention, thirdly, in the first or second feature, the horizontal member of the L-shaped frame member is provided with an annular metal fitting for lifting. It is a feature.
According to this feature, concrete products can be easily lifted by using heavy machinery used at construction sites and the like.

Further, in the concrete product lifting device of the present invention, fourthly, in any one of the first to third features, the horizontal member of the L-shaped frame member moves relative to the central horizontal member member. It is characterized in that a fixing bracket for stopping the concrete is provided.
According to this feature, the L-shaped lumber can be firmly fixed to the central lumber, so that the safety of the device can be ensured.

Further, the concrete product lifting device of the present invention is characterized in that, in any one of the first to fourth features, the insertion fitting is formed of a metal round bar.
According to this feature, the plug can be formed from a commercially available metal round bar.

Further, in the concrete product lifting device of the present invention, sixthly, in any one of the first to fifth features, the L-shaped frame member is the central horizontal frame in a state of being rotated by 180 ° in a horizontal plane. It is characterized in that it is formed so that it can be fitted into a material.
According to this feature, it is possible to lift a concrete product from a large length to an extremely small one by simply adjusting the usage pattern with the same concrete product lifting device.

The present invention has the following excellent effects.
(1) The central horizontal member having a length larger than the length of the concrete product and the L-shaped member arranged on both sides of the central horizontal member are provided, and the L-shaped member is provided. , The horizontal member is formed of a horizontal member and a vertical member, the horizontal member has a through hole for slidably fitting to the central horizontal member, and the vertical member is a concrete product under the through hole. It has a convex insertion fitting that can be inserted into the concave portion of the concrete product, and the insertion fitting is arranged on both sides of the vertical member along the longitudinal direction of the central horizontal member. It can be lifted and rotated with a simple configuration without attaching hardware for lifting, and can flexibly handle different sizes of concrete products without the need for special equipment.

(2) The central horizontal member and the horizontal member of the L-shaped frame are formed from a square pipe, so that the central horizontal member and the horizontal member of the L-shaped frame, which are the main members, are the horizontal members. Can be constructed of a commercially available square pipe, so that the device can be provided at low cost. Further, since the size of the square pipe may be changed according to the weight of the concrete product to be lifted, it is possible to easily provide an apparatus suitable for various concrete products.

(3) Since the horizontal member of the L-shaped frame is provided with an annular metal fitting for lifting, it is possible to easily lift a concrete product by using a heavy machine used at a construction site or the like. Can be done.

(4) The horizontal lumber of the L-shaped lumber is provided with a fixing bracket for stopping the relative movement with the central lumber, so that the L-shaped lumber is made into the central lumber. Since it can be firmly fixed to the lumber, the safety of the device can be ensured.

(5) Since the insertion fitting is formed from a metal round bar, the insertion fitting can be formed from a commercially available metal round bar.

(6) The L-shaped frame member is formed so as to be fitted into the central horizontal frame member in a state of being rotated by 180 ° in a horizontal plane, so that the same concrete product lifting device can be used. With just adjustment, concrete products can be lifted from large to extremely small lengths.

It is a front view of the concrete product lifting device which concerns on embodiment of this invention. It is the AA arrow view of FIG. It is a front view when the L-shaped frame material shown in FIG. 1 is mounted by rotating 180 ° in the same horizontal plane. It is a perspective view which shows the state which the insertion metal fitting of the lifting device is inserted into both ends in the longitudinal direction of a long concrete product. It is a perspective view which shows the state which the long concrete product is lifted. It is a perspective view which shows the state which rotated 90 ° in the state which the long concrete product was lifted.

A mode for carrying out a concrete product lifting device according to the present invention will be described in detail with reference to the drawings, but the present invention is not construed as being limited to this, and is not deviated from the scope of the present invention. In, various changes, modifications and improvements can be made based on the knowledge of those skilled in the art.

A concrete product lifting device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, the central horizontal member 1 is set to have a length dimension equal to or larger than the length dimension of the concrete product. In addition, in this specification, "the length dimension of a concrete product or more" includes the case of "the same as the length dimension of a concrete product".
The central horizontal member 1 has a square cross section, and is formed from, for example, a pipe having a square cross section.

L-shaped lumbers 2 and 2 are arranged on both sides of the central lumber 1. The L-shaped frame member 2 is formed of a horizontal frame member 3 and a vertical frame member 4. The horizontal member 3 has a through hole for slidably fitting to the central horizontal member 1. For example, the horizontal member 3 is formed from a hollow pipe having a square cross section, the hollow internal space is positioned as a through hole, and the central horizontal member 1 is slidably fitted in the through hole. good. The length dimension of the horizontal member 3 is arbitrary, but from the viewpoint of strength, a length of 1/4 to 1/3 of the length dimension of the central horizontal member 1 is desirable.

In FIG. 1, in a state where the outer ends of the horizontal member 3 are aligned with both ends of the central horizontal member 1, a state in which an interval L1 is provided at the center of the L-shaped members 2 and 2 on both sides is provided. As shown, since the L-shaped frame members 2 and 2 on both sides are slidable with respect to the central horizontal frame member 1 according to the length dimension of the concrete product, the central spacing L1 is the length of the concrete product. It varies depending on the dimensions. For example, when the length dimension of the concrete product is small, the L-shaped frame members 2 and 2 on both sides are gathered toward the center side and the interval L1 becomes small, and both ends of the center horizontal frame member 1 are horizontal. It protrudes from the material 3.

Now, assuming that the distance between the centers is L1 and the dimension from the central end of the L-shaped lumber 2 to the inside of the vertical lumber 4 is L2, the maximum is about "L1 + 2 x L2" and the minimum is about "2 x L2". It is possible to lift concrete products with the length dimension of. Therefore, in theory, if L1 is increased and L2 is decreased, concrete products of various lengths can be lifted. However, due to strength restrictions, L2 needs to have a certain size.

Further, on the upper surface of the horizontal member 3, a fixing metal fitting 5 for stopping the relative movement with the central horizontal member 1 is provided. The fixing bracket 5 is composed of a nut-shaped member 6 fixed to the upper surface of the horizontal member 3 and a bolt 7 screwed into the nut-shaped member 6, and the bolt 7 penetrates the upper portion of the horizontal member 3 and is centered. It is provided toward the horizontal member 1. A plurality of fixing brackets 5 are provided as needed.

Further, a handle 8 for gripping and operating the horizontal member 3 is provided at an end portion of the upper surface of the horizontal member 3 in the longitudinal direction.
Further, an annular metal fitting 9 for lifting is provided at the center of the upper surface of the horizontal member 3 in the longitudinal direction. The lifting rope 15 shown in FIGS. 4 to 6 is inserted into the annular metal fitting 9, and the device is lifted via the annular metal fitting 9.

The vertical frame member 4 of the L-shaped frame member 2 is arranged downward on the lower surface of the end portion of the horizontal frame member 3 so as to be orthogonal to the horizontal frame member 3, and is fixed by a fixing means such as welding. For example, the vertical member 4 is formed of a pipe having a square cross section.

At the lower part of the vertical member 4, a convex insertion metal fitting 10 that can be inserted into a concave portion formed at an end portion in the longitudinal direction of the concrete product is provided. The insertion fittings 10 are arranged on both sides of the vertical member 4 so as to be along the longitudinal direction of the central horizontal member 1. The insertion fitting 10 is formed of, for example, a metal round bar.

An annular metal fitting 11 is provided at the central portion of the upper surface of the central horizontal member 1 in the longitudinal direction. Then, the chain 12 is arranged so as to connect the annular metal fitting 11 and the annular metal fitting 9 for lifting the horizontal member 3. The chain 12 plays a role of preventing the L-shaped frame members 2 and 2 from being separated from the central horizontal frame member 1.

In FIG. 3, after the L-shaped lumbers 2 and 2 shown in FIG. 1 were once separated from the central lumber 1, they were rotated 180 ° in the same horizontal plane and reattached from both ends of the central lumber 1. It is a front view which showed the state.

As shown in FIG. 3, when the L-shaped frame members 2 and 2 are rotated by 180 °, it is possible to lift a concrete product having a maximum length of about “L1” and a minimum of about “zero”. be.

As described above, by adjusting the usage pattern with the same concrete product lifting device, the length dimension of the concrete product ranges from a maximum of about "L1 + 2 x L2" to a minimum of about "zero". It can be lifted and rotated.

FIG. 4 is a perspective view showing a state in which the insertion fittings 10 and 10 of the lifting device are inserted into both ends of the long concrete product 13 in the longitudinal direction.
Recesses are formed at both ends of the concrete product 13 in the length direction, and the concrete product 13 is placed on a base 14 such as a formwork.
By the operator, the fixing metal fittings 5 of the L-shaped frame members 2 and 2 of the lifting device are loosened, and the vertical frame members 4 are moved until the distance between the vertical frame members 4 becomes longer than the length dimension of the concrete product 13, and the insertion metal fittings 10 and 10 are moved. The L-shaped frame members 2 and 2 are moved to the center side and inserted at positions corresponding to the recesses of the concrete product 13. When the insertion metal fittings 10 and 10 are inserted into the recesses of the concrete product 13, the fixing metal fittings 5 are tightened, and the L-shaped frame members 2 and 2 are fixed to the central horizontal frame member 1.

FIG. 5 is a perspective view showing a state in which the long concrete product 13 is lifted.
When the lifting device is lifted via the lifting rope 15, the concrete product 13 supported by the lifting device rises away from the table 14 while maintaining the same posture.

FIG. 6 is a perspective view showing a state in which the concrete product 13 is rotated by 90 ° in a state where the long concrete product 13 is lifted.
The lifted concrete product 13 is rotated by an operator by 90 °. Since the concrete product 13 is supported by the insertion brackets 10 and 10 at both ends in the longitudinal direction, the rotation operation can be easily performed because the force required for the rotation is small.

1 Central horizontal member 2 L-shaped member 3 Horizontal member 4 Vertical member 5 Fixing metal fitting 6 Nut-shaped member 7 Bolt 8 Handle 9 Ring metal fitting for lifting 10 Insert metal fitting 11 Ring metal fitting 12 Chain 13 Concrete products 14 units 15 Lifting rope

Claims (6)

A central horizontal lumber with a length that is greater than or equal to the length of a concrete product,
It is provided with L-shaped lumbers arranged on both sides of the central lumber.
The L-shaped lumber is formed of a horizontal lumber and a vertical lumber.
The horizontal member has a through hole for slidably fitting to the central horizontal member.
The vertical member has a convex insertion fitting that can be inserted into a concave portion of the concrete product at the lower portion thereof, and the insertion fitting is formed of the vertical member so as to be along the longitudinal direction of the central horizontal member. A concrete product lifting device characterized by being arranged on both sides. The concrete product lifting device according to claim 1, wherein the central horizontal member and the horizontal member of the L-shaped frame are formed of a pipe having a square cross section. The concrete product lifting device according to claim 1 or 2, wherein the horizontal member of the L-shaped frame is provided with an annular metal fitting for lifting. Any one of claims 1 and 3, wherein the horizontal member of the L-shaped frame member is provided with a fixing bracket for stopping the relative movement with the central horizontal member. The concrete product lifting device described in the section. The concrete product lifting device according to any one of claims 1 to 4, wherein the insertion fitting is formed of a metal round bar. The concrete according to any one of claims 1 to 5, wherein the L-shaped frame member is formed so as to be fitted into the central horizontal frame member in a state of being rotated by 180 ° in a horizontal plane. Product lifting device.

Images