JPS6018787B2 - How to invert concrete three-dimensional members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a concrete three-dimensional member with an angle of 90 degrees or 180 degrees.
Regarding the reversal method, in particular, a pivot point is provided directly or indirectly at one or both corners of the lower part of the concrete three-dimensional member, and the concrete three-dimensional member is hoisted in that position by a crane, and the reversing fulcrum of the mast that is separately provided in advance is used. The three-dimensional concrete member is characterized in that it supports one of the pivot points, then loosens the crane, rotates it 90 degrees around the pivot point under its own weight, and installs it at a predetermined level using the crane in the inverted position. Regarding the reversal method, further,
Invert the concrete three-dimensional member 90 degrees by the above method, then lift it up with a crane in that position, support the other pivot point of the concrete three-dimensional member on the same or other inversion fulcrum of the mast, and then lift the crane. Loosen it and use your own weight to flip it another 90 degrees around the pivot point,
The present invention relates to a method for inverting a three-dimensional concrete member, which is characterized in that the three-dimensional concrete member, which has been inverted by a total of 180 degrees, is installed in the same position in a predetermined position using a crane.

Conventionally, when reversing a large concrete three-dimensional member that has been molded using a kataiki, etc., a wire is wrapped around the concrete three-dimensional member and engaged in a squeezing manner, and the crane is moved while lifting it with the wire. The center of gravity of the concrete three-dimensional member is changed by changing the hanging point, and the concrete three-dimensional member is reversed by the moment due to its own weight, or two cranes are used to lift the concrete three-dimensional member at two locations. Wrapping individual wires and engaging them as if squeezing them, lifting them with individual cranes, operating both cranes to change the center of gravity of the three-dimensional concrete member,
A common method was to use the moment due to the weight generated by this change to reverse the movement. However, in the former method, since the wire is wrapped around the three-dimensional concrete member and squeezed, the three-dimensional concrete member may be deformed or damaged, and the corner of the three-dimensional concrete member is loaded with a heavy weight D, causing the corner to be squeezed. In addition, since the concrete three-dimensional member is lifted by a wire and the crane is moved to move the center of gravity of the three-dimensional concrete member and turn it over, operating the crane in this case is difficult and the work is dangerous. Met.

In addition, in the latter method, two cranes are used, which increases the cost of equipment and is uneconomical. In addition, the wires are wrapped individually and the two cranes are operated individually, so that the concrete can be lifted up by joint lifting. In this case as well, the crane was difficult to operate and the work was dangerous, as the center of gravity of the member was moved to reverse it. This inventor came up with this invention in view of such problems.

That is, this invention uses a reversing jig that is simple in structure and can be manufactured at low cost, when a pivot point is provided directly on a concrete three-dimensional member, or when there is no pivot point on the three-dimensional concrete member. This makes it possible to perform highly safe reversing work without deforming or damaging the three-dimensional concrete member, and it is also economical, safe and easy to perform reversing work as there is no need to install a second crane device. This is a method for reversing concrete three-dimensional members.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for reversing a concrete three-dimensional part, which allows highly safe reversing work without deforming or damaging the three-dimensional concrete member to be reversed. The purpose of this invention is to
To provide a method for reversing a three-dimensional concrete member which is economical without the need for extra equipment, and which can safely and easily invert the three-dimensional concrete member by 90 degrees or 180 degrees. That is, this invention:
A concrete three-dimensional part village 2 with a holly point 1 provided directly or indirectly at the lower corner is lifted by a crane 3 in the same position, and a reversal fulcrum 5 of a mast 4 provided separately in advance is used.
The pivot point 1 of the three-dimensional concrete section 2 is damaged, and then the crane 3 is loosened and the three-dimensional concrete member 2 is reversed 90 degrees by its own weight around the pivot point 1, and then the rotated three-dimensional concrete member 2 is moved to the mast. A specified invention is a method for reversing a three-dimensional concrete section, which is characterized by separating from the reversing fulcrum 5 of 4 and installing it at a predetermined level using a crane 3 in an inverted position. Concrete three-dimensional member 2 with points la and lb
is hoisted by the crane 3 in the same position, one pivot point la of the concrete three-dimensional member 2 is supported on the reversal fulcrum 5 of the mast 4 provided separately in advance, and then the crane 3 is loosened and the concrete three-dimensional member 2 is lifted up by the crane 3. The concrete three-dimensional member 2 is rotated 90 degrees around one pivot point la by its own weight, and then the crane 3
The other pivot point lb of the concrete three-dimensional member 2 is moved to the same or other inversion fulcrum point 6 of the mast 4.
Then, by loosening the crane 3, the concrete three-dimensional village 2 is further lifted by its own weight from the other mapped point lb.
A method for inverting a concrete three-dimensional member, which is characterized in that the concrete three-dimensional member 2 which has been inverted by 0 degrees and which has been inverted by a total of 180 degrees is installed in a predetermined layer by a crane 3 in the same posture, is a combined invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a front view of a reversing jig 7 that forms a border around the concrete three-dimensional village 2, and FIG. 2 is a left side view of the same.

At one corner of the lower part of the reversing jig 7, there is provided a pivot point 1 consisting of a reversing pin extending over a receiving member 8 projecting downward. The pivot point 1 may be provided directly on the concrete three-dimensional member 2. In this case, the reversing jig 7 is not required, but when the pivot point 1 is provided in the concrete three-dimensional member 2, the engagement hole 13 must also be provided directly in relation to the pivot point. Furthermore,
The reversing jig 7 has the pivot point 1, a pair of connecting portions 9 pivotably spaced apart from each other at intervals corresponding to the dimensions of the three-dimensional concrete member 2 to be reversed, and has a rigid structure such as an H-shaped rope. A base member 10 formed of a member having
Fastening members 11 such as bolts and nuts connected to the connecting member 9 of
It consists of a holding member 12 that is integrated with the base village 10 via a base plate, surrounds the three-dimensional concrete member 2, and tightens and holds the three-dimensional concrete member 2. Further, engagement holes 13 are provided in the vicinity of the pivot point 1 and at both corners of the holding portion village 12. This engagement hole 13 is a hole for engaging the other end of a wire 14 whose one end is engaged with the crane 3 and used for raising and lowering the concrete three-dimensional village 2 by the crane 3. Reversing pick-up tool 7 in this embodiment
The base member 10 is formed of a rigid section steel such as an H-section steel, and the holding member 12 is formed of a band-shaped member such as a band steel.

That is, when the concrete three-dimensional member 2 has a U-shaped cross-section (as shown in FIG. 3), it is well known that the tip end on the opening side is the weakest. Therefore, when inverting this three-dimensional concrete member 2, it is necessary to take care to prevent external forces from acting on the tip as much as possible. Based on this idea, the base village 10 was formed of H-beam steel, and the rest of the structure was formed of band steel. Therefore, in the case where the cross section is square-shaped, the purpose can be sufficiently achieved even if the entire member is made of a band-like member such as band steel. Next, a working procedure for inverting the concrete three-dimensional member 2 by 90 degrees using the inversion jig 7 according to the inversion method according to the present invention will be explained (this state is shown in FIG. 4A).

The three-dimensional concrete member 2 to be inverted is placed on the pedestal 15, and then two sets of the inverted odor control members 7 are wrapped and fastened at appropriate positions on the three-dimensional concrete member 2 with the pivot point 1 facing downward.

Next, the wires 14, one of which is locked to the crane 3, are individually locked to the four engagement holes 13 on the top of the reversing jig 7, and are lifted up by the crane 3 in that position. Furthermore, at the reversal fulcrum 5 of the mast 4, which was provided separately in advance,
The pivot point 1 of the concrete three-dimensional member 2 is supported. The mast 4 in this embodiment has a frame structure as a whole, and its lower part is fixed to the ground, and a bracket 16 forming an inversion fulcrum 5 is fixed to its top part. However,
Of course, the mast 4 may be fixedly suspended from the ceiling and the bracket may be provided at the lower end thereof, or a placket may be fixed to the wall of a suitable structure. In short, it is sufficient that the mast 4 or the board surface supporting the bracket 16 has a structure that can withstand the work of reversing the concrete three-dimensional member 2. Next, the crane is loosened while moving laterally, and the three-dimensional concrete member 2 is turned over 90 degrees using the pivot point 1 due to the moment due to its own weight. In the figure, reference numeral 17 denotes a pedestal that comes into contact with the concrete three-dimensional member 2 that has been inverted 90 degrees and supports the concrete three-dimensional member 2 from the side of the mast 4. Next, the concrete three-dimensional body 2 in an inverted state is moved to the mast 4.
While the wires 14 are supported on the reversing fulcrum 5 of the reversing pick 7, the wires 14 that are engaged with the four engaging holes 13 are removed, and the wires 14 are inserted into the four engaging holes 13 that have moved to the upper part of the concrete three-dimensional member 2. Rehang one end of each wire 14. After that, the crane 3 is raised, the support between the pine point 1 and the reversal fulcrum 5 is disengaged, and the crane 3 is installed at a predetermined layer while maintaining the position reversed by 90 degrees from the initial state. The 90 degree reversal work of concrete three-dimensional member 2 is completed. FIG. 5 is a front view showing another embodiment of the reversing jig 7, and FIG. 6 is a right side view of the same.

This reversing jig 7' is used when continuously reversing the concrete three-dimensional part village 2 to be reversed by 180 degrees. This reversing jig 7' is the reversing jig 7 for 90 degree reversal.
The structure is basically the same as that of , but one additional pivot point 1 is formed on the 90-degree reversal jig 7, and two engagement holes 13 are additionally formed on the protruding side of the pivot point 1. This is what I did. That is, pivot points 1, 1 are provided at both corner portions of the base member 10, each consisting of a reversing pin extending over a receiving member 8 projecting downward. Furthermore, two engagement holes 13 are formed downward. Furthermore, in order to invert the three-dimensional concrete member 2 by 180 degrees, the reversing feeder 7' also has a holding member 12 facing the base member made of H-beam steel having appropriate rigidity. Further, support members 18 having an appropriate shape to match the shape of the concrete IJ solid section 2 to be inverted are provided on both inner sides of the holding section 12. Thus, the base member 10
The three-dimensional concrete member 2 is sandwiched between the three-dimensional concrete member 2 and the holding member 12, and the tongue buckle 19 is tightened between the supporting member 18 and the base member 10 to integrally connect the three-dimensional concrete member 2 and the reversing jig 7'. Fix it. As a result, the concrete three-dimensional member 2 is separated from the base member 10 and the holding member 1.
2, and also held by the support members 18, 18, so that even during reversal, it can be held stably at all times by this reversing pick-up tool 7'. 20' in the diagram
Well, it is a connecting member that connects two sets of reversing jigs 7'. When connected using this connecting member 20, the reversing jig 7' can be made even stronger. Next, the procedure for inverting the three-dimensional concrete member 2' having the shape shown in FIG. 7 by 180 degrees using the inverting pick-up tool 7' will be explained.

The concrete three-dimensional member 2' to be inverted is remounted on the pedestal 15, and then the integrated inverting pick-up tool 7' is moved to the pivot point l.
With a and lb on the lower side, it is wrapped and attached vertically so as to sandwich the protrusion 2a of the three-dimensional concrete section 2'.

Next, the concrete three-dimensional member 2' is lifted up by the crane 3, one pivot point la is supported on the reversing fulcrum 5 provided at the top of the mast 4, and the concrete three-dimensional member 2' is inverted 90 degrees. Since the work procedure is the same as the work procedure for inverting the concrete solid member 2' by 90 degrees, the explanation thereof will be omitted, and the procedure after inverting the concrete three-dimensional member 2' by 90 degrees will be explained (this state is shown in (shown in A to F)
. Concrete three-dimensional member 2' inverted 90 degrees,
While one pivot point la is supported on the reversing fulcrum 5 of the mast 4, the wires 14 that are engaged with the four engagement holes 13 of the reversing jig 7' are removed, and one end of each is connected to the concrete three-dimensional member 2.
Re-hook it into the four engaging holes 13 that have moved to the upper part of '.

After that, the crane 3 is raised and the support between the pine point la and the reversal fulcrum 5 is released. Next, the crane 3 is lowered and the other pivot point lb is supported on the reversal support point 6 provided in the middle of the mast 4. Instead of this reversal fulcrum 6, the reversal fulcrum 5 may be used again. Further, the crane 3 is loosened while being moved laterally, and is turned 90 degrees around the pivot point lb by the moment due to its own weight. Thus, the concrete three-dimensional village 2' is reversed by a total of 180 degrees. In the figure, reference numeral 21 denotes a support stand that supports the concrete three-dimensional member 2' that has been inverted 180 degrees. Next, while the concrete three-dimensional member 2', which has been inverted 180 degrees, is supported by the support part of the pivot point lb and the inversion fulcrum 6 and the support base 21,
Rehang each end of the wire 14 into the four engagement holes 13 facing upward. Thereafter, the crane 3 is raised to disengage the support between the pivot point lb and the reversal support point 6, and the crane 3 is installed at a predetermined layer while maintaining the posture reversed by 180 degrees from the initial state. This completes the work of inverting the concrete three-dimensional member 2' by 180 degrees. As described above, according to the present invention, it is possible to perform highly safe reversing work without deforming or damaging the concrete three-dimensional structure to be reversed, and it is economical because there is no need to provide extra equipment. It is possible to provide a method for reversing a three-dimensional concrete member that can safely and easily invert the three-dimensional concrete member by 90 degrees or 180 degrees.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of the reversing jig, FIG. 2 is a left side view of the same, FIG. 3 is a perspective view of a three-dimensional concrete member, and FIG. 4 is a three-dimensional concrete member. An explanatory diagram showing the work procedure when reversing a member 90 degrees,
Fig. 5 is a front view showing another example of the reversing jig, Fig. 6 is a right side view of the same, Fig. 7 is a perspective view showing another example of the concrete three-dimensional member, and Fig. 8 is a concrete three-dimensional member. FIG. 2 is an explanatory diagram showing a work procedure for reversing from 90 degrees to 180 degrees in the case of reversing 180 degrees. In the figure, 1, la, and lb are pivot points, 2 is a concrete three-dimensional member, 3 is a crane, 4 is a mast, and 5 and 6 are reversal fulcrums. Number 7 Figure Shark 1 Figure Leopard 2 Figure 3 Leopard Mu Sakaki Number 6 Illustration Experiment 5 Figure Old Man 8 Figure

Claims (1)

[Scope of Claims] 1. A concrete three-dimensional member having a pivot point directly or indirectly provided at a lower corner is lifted by a crane in that position, and the pivot point of the concrete three-dimensional member is placed on a reversing fulcrum of a mast provided separately in advance. Then, the crane is loosened and the three-dimensional concrete member is reversed 90 degrees by its own weight around the pivot point.Then, the rotated three-dimensional concrete member is detached from the reversing fulcrum of the mast, and is moved to a designated position by the crane while in the inverted position. A method for reversing a three-dimensional concrete member, which is characterized by installing it in a certain position. 2. A concrete three-dimensional member with pivot points provided directly or indirectly at both lower corners is lifted by a crane in that position, and one pivot point of the concrete three-dimensional member is supported on a reversing fulcrum of a mast provided separately in advance, Next, loosen the crane and turn the concrete three-dimensional member 90 degrees around the one pivot point by its own weight, and then lift the concrete three-dimensional member in the same position with the crane, and move the other pivot point of the concrete three-dimensional member, The mast is supported on the same or other reversing fulcrum as above, and then the crane is loosened and the concrete three-dimensional member is further reversed 90 degrees by its own weight around the other pivot point, and the concrete three-dimensional member that has been reversed a total of 180 degrees is left as it is. A method for reversing a three-dimensional concrete member, characterized by installing it in a predetermined position using a crane.