JPH10324491A - Concrete molding hoisting jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hoisting jig having an embedding lock part, which can be removed. SOLUTION: This jig has a lock part 30 embedded in a concrete side wall 2a freely to be removed and a wire fitting hoisting pin 12 to be fitted to the lock part 30, and the lock part 30 is formed with an engagement hole 32 inside thereof, and a peripheral surface thereof is formed with a screw part 34. In the side wall 2a, since the lock part 30 is embedded in an insertion hole, which is communicated with the only outer peripheral surface, even in the case where the lock part 30 is removed, water leak from the insertion hole is not generated. Since the lock part 30 is provided with a screw part 34 in the peripheral surface thereof, the lock part 30 adapts to the side wall, and the lock part 30 can be strongly embedded in the side wall. Since the screw part is provided, the lock part can be easily removed from the side wall. This hoisting jig can be recycled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting jig for molded concrete products. Specifically, when molding a concrete molded product, a part of the lifting jig is embedded,
When it is no longer necessary to lift it, it can be removed from the concrete molded product, making it easy to attach and detach it from the concrete molded product.
The present invention relates to a lifting jig for a concrete molded product capable of effectively preventing a filler from dropping into a cavity after being removed.

[0002]

2. Description of the Related Art When a concrete molded product in the form of a rectangular tube is carried out from a factory to a storage place or cured,
As shown in FIG. 8, the concrete molded article 2 is transported by using a lifting jig 10 attached to both left and right side walls (for example, a side wall 2a serving as a top plate and a bottom plate). For example, a lifting jig 10 as shown in the figure is attached to several places on the side wall 2a, a wire 11 is hooked on the lifting jig 10, and the concrete molding 2 is lifted up and down in the longitudinal direction as shown in FIG. In many cases, the concrete molded product 2 is taken out to an outside storage place, or the concrete molded product 2 is laid down sideways as shown in FIG. 9B for storage and curing.

As a lifting jig 10 used for lifting and transporting a concrete molded product 2 as described above, there is a conventional one employing a pin type as shown in FIG.

In FIG. 1, reference numeral 12 denotes a lifting pin. In order to fix the lifting pin 12 to the side wall 2a, a predetermined portion of the side wall 2a is formed with a single or a plurality of cones at a predetermined distance. An insertion hole 4 is formed.

The lifting pin 12 comprises a conical abutting portion 14, a male screw portion 16 formed on the tip of the conical abutting portion 14, and a wire attaching portion 18 formed on the rear end of the conical abutting portion 14. The inner diameter of the insertion hole 4 is selected so that the contact surface and the inner surface of the insertion hole 4 match.

[0006] In order to mount and fix such a lifting jig 10 on the concrete side wall 2a, concrete is filled in a form for solidifying a concrete molded product, and then solidified. After removing both the frame plate and the outer frame plate, that is, after removing the mold, an insertion hole 4 is formed from the outside of the concrete molded product 2. Thereafter, a worker enters the inside of the concrete molded product 2, inserts the lifting pin 12 from the outside of the insertion hole 4 as shown in FIG. After the lifting jig 10 is fixed to the concrete side wall 2a as shown in FIG. 11, the wire 11 is hooked on the mounting portion 18 to lift the concrete molded product 2.

[0007] The concrete molded article 2 is transported by using the lifting jig 10, and when the installation at the construction site or the like is completed, the lifting jig 10 is removed. In order to cover the insertion hole (perforation) 4 remaining after the removal, a rubber stopper 22 is fitted inside as shown in FIG. 12, and then the mortar or epoxy resin is filled to completely close the insertion hole 4. I have.

A lifting jig 1 using such a pin method.
In the case of No. 0, since the work of piercing the insertion hole 4 must be performed after concrete molding, the inner surface of the insertion hole 4 is lifted by the pin 1.
It is very difficult to perforate the outer peripheral surface of the second conical contact portion 14 completely.

Therefore, the inner surface of the insertion hole 4 and the conical contact portion 1
Since the contact state with the 4 is not perfect, there is a possibility that a part of the insertion hole 4 may be broken by the lifting load during lifting. Furthermore, since the worker has to enter the inside of the concrete molded product 2 in order to attach the lifting jig 10 to the concrete molded product 2, the mounting operation is troublesome and requires a lot of manual labor. After the lifting pin 12 is removed, the insertion hole 4 is closed with an epoxy resin or the like. If the closing is insufficient, water leakage or the like occurs.

Various improvements have hitherto been made to prevent these drawbacks. FIG. 13 shows an example in which the nut 20 is buried in the concrete side wall 2a, and the insertion hole 4 is previously formed with a hole so that it can be formed simultaneously with concrete molding.

FIG. 14 shows a so-called deha system.
The T-shaped metal lifting pin 26 itself is embedded in the concrete molded product 2 and the T-shaped mounting portion 26a is exposed to the outside.

FIG. 15 shows a lifting jig 10 of a so-called lift anchor type, which also has a bifurcated lifting pin 28 embedded in the concrete side wall 2. The mounting portion 28a is a hole through which the wire 11 passes.

FIG. 16 shows a screw 30 itself embedded in the concrete side wall 2a, and a male screw portion (not shown) screwed into the screw 30 serves as a wire attachment portion.

[0014]

The conventional examples shown in FIGS. 13 to 16 are not insertion holes 4 communicating with the inside and outside of the side wall 2a as shown in FIG. There is no fear that water or the like leaks through the insertion hole 4. However, in any case, since all or a part of the lifting jig 10 is embedded in the concrete side wall 2a, it cannot be used repeatedly. In other words, it is disposable. Since the cost of materials such as mounting pins to be embedded is relatively expensive, there is a problem that the cost is high in this disposable method.

Further, in this embedding method, since the concrete is completely solidified and the concrete strength is increased,
Curing (steam curing) must be performed, but the curing time (usually about 4 hours) also varies, and if the concrete is lifted under insufficient curing, the embedded lifting jig 10 comes off. The timing of the judgment is also difficult.

Therefore, in order to solve such a conventional problem, the present invention proposes a lifting jig which can be reused and can be firmly attached to a concrete side wall.

[0017]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has a locking portion detachably embedded in a concrete side wall, and a lifting pin for wire attachment attached to the locking portion. The engaging portion has an engaging hole formed therein and a threaded portion formed on an outer peripheral surface thereof.

In the present invention, even if the lifting jig is removed from the concrete side wall because of the reusable embedded type, water leakage does not occur because the engaging jig is not an engagement hole communicating inside and outside. Since the locking portion is reusable, the cost of the lifting jig itself is reduced. The locking portion is embedded in the concrete side wall with its pin engagement hole exposed to the outside. Since the surface matching between the surface of the pin engagement hole and the conical contact portion is good, the lifting strength is increased. Since the screw portion is cut on the outer surface of the locking portion, it is easy to remove the locking portion from the concrete side wall.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a lifting jig for a concrete molded product according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a concrete example of a lifting jig 10 for a concrete molded product according to the present invention. The lifting jig 10 is also provided at a predetermined position on the opposing concrete side wall 2a as in FIG. Two lifting jigs 10, 10 are attached to each.

The lifting jig 10 has a locking portion 30 which is detachably embedded in the concrete side wall 2a. The locking portion 30 is constituted by a conical body 31 as a whole, and has a conical and tapered engaging hole 32 formed therein. A screw portion 34 is formed on the outer peripheral surface of the main body 31 over the entire periphery thereof, and a tapered tip portion 36 is provided with a screw threaded portion 36.

When the locking portion 30 is embedded in the concrete side wall 2a as described later, the end surface 31a of the main body 31
Is embedded so as to be flush with the side wall 2a, and the distal end side of the threaded portion 36 is embedded into the inner surface of the concrete side wall 2a such that the thickness Wb remains. For example, when the thickness Wa of the concrete side wall 2b is about 100 to 130 mm, the mutual relation is selected so that Wb is about 30 mm. Leaving this thickness Wb and synergy with the screw portion 34 and the concrete to be filled are improved, so that the locking portion 30 can be firmly embedded in the concrete side wall 2a.

The lifting pin 12 is inserted and screwed into an engagement hole 32 formed in the main body 31. Therefore, the lifting pin 12 is provided with a conical abutting portion 14 having the same outer diameter as the engaging hole 32 as in the conventional case, and a threaded portion screwed into a threaded portion (female threaded portion) 36 at the tip thereof. (Male thread) 1
6 are integrally formed.

The other end of the conical contact part 14 is used as a wire attachment part 18. The wire attachment portion 18 has circular flanges 18a and 18b on the left and right, and the size of the inner circular flange 18a is selected so as to abut the end face 31a of the main body 31. In this example, it is selected to be larger than the outer diameter of the main body end face (> D1 + 2D2) (see FIG. 2).

FIG. 2 shows the shape of the end face 31a of the main body 31. Semicircular engaging recesses 38a and 38b are provided on a part of the end face 31a, in this example, on both the right and left portions 180 ° apart. . The engagement recesses 38a and 38b are used when the locking portion 30 is removed from the concrete side wall 2a.

The locking portion 30 is fixed to the concrete side wall 2a.
By attaching the mounting pin 12 into the engaging hole 32 in the main body 31 and screwing the screw portion 16 into the screwing portion 36, the lifting pin 12 is engaged as shown in FIG. The stop 30 is completely engaged. That is, since the inner surface shape of the engagement hole 32 and the outer surface shape of the conical contact portion 14 completely match, if the two are inserted and screwed together, the lifting pin 12 can be firmly attached and fixed to the locking portion 30. .

As described above, the lifting pin 12 and the locking portion 30
Is a molded product made of a metal mold, so that the inner surface of the engagement hole 32 and the outer surface of the conical abutment portion 14 are completely in close contact with each other. In addition, since no extra force or biased force is applied to the concrete side wall 2a, it is possible to effectively prevent the side wall loss.

In order to embed the locking portion 30 in the concrete side wall 2a, as shown in FIG.
When concrete is filled between the outer frame plate 40b and the outer frame plate 40b, the locking portion 30 is fixed to a predetermined position of the outer frame plate 40b. In the example shown in the figure, the locking portion 30 is screwed to the tip of the mounting screw 50 using the mounting screw 50 and the nut 52 and fixed to the outer frame plate 40b. When the concrete is filled in this state, the end face 31a of the main body coincides with the side wall surface as shown in FIG. 1, and the locking portion 30 can be embedded in the concrete side wall 2a while leaving the width Wb.

FIG. 5 shows a state in which the locking portion 30 is embedded and the lifting pin 12 is attached thereto. This example is an example in which the lifting jig 10 is attached at two positions approximately two-thirds of the length of the concrete side wall and at substantially equal intervals from the center L. The concrete molded product 2 can be lifted and carried out by attaching the wire 11 using the pair of lifting jigs 10.

When the concrete molded product 2 is carried out and set on a construction site, the locking portion 30 is removed from the concrete side wall 2a (details will be described later). Thereafter, as shown in FIG. 6, the inside of the hole 55 as an insertion hole is closed by the epoxy resin 24 or the like.

To remove the locking portion 30 embedded in the concrete side wall 2a, a detaching jig 6 as shown in FIG.
0 is used. In the figure, the relationship between the two is illustrated with the locking portion 30 removed for convenience of explanation.

With respect to the pair of engaging recesses 38a and 38b provided on the end face 31a of the main body, the removal jig 60 is provided with a pair of pins 64a and 64a engaging with the pair of engaging recesses 38a and 38b.
It has a mounting disk 62 having 64b. On the opposite surface of the mounting disk 62, a square abutment projection 6 is provided at the center thereof.
6 is provided, while the abutting projection 66
An abutment recess 68 having the same rectangular recess as that of FIG.

When a pair of engaging pins 64a, 64b provided on the mounting disk 62 are engaged with the engaging recesses 38a, 38b, and the rotating rod 70 is rotated in this state, the concrete is actuated by the screw portion 34. Locking portion 3 embedded in side wall 2a
0 can be removed very easily.

Incidentally, when the screw portion 34 is not formed on the outer peripheral surface of the main body 31, the locking portion 30 can be easily removed, but the locking portion 30 is firmly fixed to the concrete side wall 2a. It may not be possible. This is because the locking portion 30 is easily removed from the concrete side wall 2a. The removed locking portion 30 can be reused as a part of the lifting jig 10 of another concrete molded product, so that it can be repeatedly used.

[0035]

As described above, in the present invention, a lifting jig for a concrete molded product is constituted by the locking portion and the lifting pin. According to this, since the locking portion is embedded in the insertion hole communicating only with the outer surface of the concrete side wall, even if the locking portion is removed, water or the like does not leak from the insertion hole.

Since the locking portion is provided with a threaded portion on the outer peripheral surface, the fitting with the concrete side wall is improved, and the locking portion can be firmly embedded in the concrete side wall. Thus, there is no danger that the locking portion will fall out of the concrete side wall during use. Further, since the screw portion is provided, the locking portion can be easily removed from the concrete side wall, and the work time for attaching and detaching the lifting jig can be reduced as compared with the conventional case.

By reusing the lifting jig, the cost of the lifting jig can be reduced. In addition, since the trace of the screw portion remains on the concrete side wall after the removal, the epoxy resin filled in the hole is hardly dropped.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of a lifting jig for a concrete molded product according to the present invention.

FIG. 2 is a plan view of a locking portion.

FIG. 3 is a sectional view showing a state in which a lifting pin is engaged.

FIG. 4 is a diagram illustrating an example of an embedding operation.

FIG. 5 is a perspective view of a concrete molded product.

FIG. 6 is a cross-sectional view showing a state where a locking portion is removed.

FIG. 7 is a perspective view of the jig with the locking portion removed.

FIG. 8 is a perspective view illustrating a concrete lifting state.

FIG. 9 is a diagram illustrating a lifting example.

FIG. 10 is a sectional view of a conventional lifting jig (part 1).

FIG. 11 is a view showing an inserted state of a lifting pin.

FIG. 12 is a diagram showing a state in which lifting pins are removed and filled.

FIG. 13 is a sectional view of a conventional lifting jig (part 2).

FIG. 14 is a sectional view of a conventional lifting jig (part 3).

FIG. 15 is a sectional view of a conventional lifting jig (part 4).

FIG. 16 is a sectional view of a conventional lifting jig (part 5).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lifting jig 12 Lifting pin 14 Conical contact part 30 Locking part 31 Main body end face 32 Engagement hole 34 Screw part 36 Screw part

Claims (2)

[Claims] 1. A locking portion detachably embedded in a side wall of a concrete, and a lifting pin for mounting a lifting wire attached to the locking portion, wherein the lifting portion has the lifting portion inside the locking portion. A lifting jig for a concrete molded product, wherein an engaging hole for a pin is formed, and a screw portion for extracting the locking portion from the concrete side wall is formed on an outer peripheral surface thereof. 2. The concrete according to claim 1, wherein a screw portion is provided at a tip end of said lifting pin, and a screwing portion is provided at said locking portion to be screwed with said screw portion. Lifting jig for molded products.