JPS5847872A - Apparatus for attaching reinforcing iron rod to large structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the placement of large-sized reinforcing bars that are attached to predetermined locations on the side walls of L) low-temperature underground tanks such as IGs.

One known method for constructing an am for an underground tank is to use the so-called reverse winding method, in which concrete is poured sequentially from the top to the bottom inside a continuous underground wall that has been constructed in advance.

By the way, conventionally, in such construction methods, when installing reinforcing bars at the locations that will become the side walls, the so-called para-assembly method was used, in which the reinforcing bars were manually lifted one by one and connected to each other. It was under construction. However, with this method, the reinforcing bars must be hoisted up and assembled one by one, which is extremely inefficient, lengthens the construction period, requires a great deal of labor, and increases construction costs. There was a moment when I decided to upload it.

Therefore, the present inventor devised a construction method in which the reinforcing bars are machine-gunned together on the ground in advance, and the large-sized reinforcing bars are hoisted up and connected to predetermined locations. In this construction method, the already constructed side walls will get in the way when the large-sized reinforcing bars are lifted in using cranes, so the large-sized reinforcing bars are placed below the existing structure. In addition, especially when constructing walls for underground tanks for low-temperature liquefied gas such as LNG, segments with insulation material attached to the surface are used as the inner frame of l1llIi. Since I found this problem, I have to avoid damaging this segment.

The present invention has been made in view of the above-mentioned circumstances, and even if the segment is installed inside the side wall without being obstructed by the existing side wall, it can be installed without damaging the segment. The purpose of the present invention is to provide a device for installing large-sized reinforcing bars that can hang up reinforcing bars.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, reference numeral 1 denotes a pedestal, and one end thereof is provided with a large-sized reinforcing bar 3 on which the large-sized reinforcing bars 2 are placed vertically, and a scaffold board 4 is placed in the middle. A scaffold board placement section 5 on which the scaffold board is placed is provided. Scaffold board placement part 5
Rope connection fittings 6.7 are attached to both sides of the lower part of the rope. These hanging metal Ate, 7 has p
- one end of each rope 8.9 is connected, and the other end of these ropes 8.9 is connected to a crane (not shown).
are connected to each. Furthermore, a counterweight 11 is attached to the other side of the pedestal 1. A gravity center position changing mechanism 14 consisting of a hoist 12 and a motor 18 for driving the hoist 12 is attached to the upper center of the counterweight 11. Furthermore, rope connection slings 15 and 16 are respectively mounted on both sides of the upper part of the counterweight 11. One end of a rope 17.18 is connected to each of these hanging fittings 15.10, and the other end of each of these ropes 17.18 is connected to a pulley device 1g as described later.

The pulley system [19] consists of a fixed pulley 2o, a movable pulley 21, and a rope 22 wound between these pulleys 20, 21. The hook 23 connected to the fixed pulley 18 is connected to the rope 24
A hook 25 is connected to a hook 10 of a crane (not shown) via a hook 25 and a movable pulley 21.
is connected to the other end of said rope 17,18.

Further, a rope 22 extending from the fixed pulley 20 is wound around the hoist 12. Then, by rotating the hoist 12 in the forward or reverse direction to wind up or unwind the rope 22, the fixed wheel 20 and the movable pulley 2 are rotated.
The distance between the hook 1o and the hanging metal fittings 15 and 16 can be changed arbitrarily, and the distance l between the hook 1o and the hanging fittings 15 and 16 can also be changed arbitrarily.

Next, we used this device to convert the existing 2ft large-sized reinforcing bars into I&8.
The case where it is attached to the bottom -1 of 1 will be explained.

Before this explanation, we will briefly explain how to construct the @wall of a low-temperature underground tank using Sakamaki-i. Without a trench, a continuous underground 1132 is constructed at a location corresponding to the outer periphery of the tank. Next, large-sized reinforcing bars 2 are placed at locations corresponding to the internal portion of the side 1181, and segments 88 are attached to the internal portion of the side 1131.Next, the continuous underground 1182
1i81 is constructed by using segment 3at as the outside formwork and segment 3at as the inside formwork, and pouring concrete inside. In addition, 34 is a segment protection board.

By the way, the large-sized reinforcing bars 2 are assembled into a predetermined shape by connecting the reinforcing bars to each other on-site or in a factory. and,
The large-format reinforcing bars 2 produced in this manner are lifted up and moved by a crane (not shown) and placed on the large-format reinforcing bar mounting portion 8 of the pedestal 1. Next, the hoist 12 is rotated and adjusted so that the seven hoists 10 of the crane are vertically above the center of gravity G1 of the gantry 1, and after holding the gantry 1 horizontally, the crane ropes 8, 9, 17 are adjusted. ．．
The pedestal 1 is lifted up and moved via 18, and placed below the existing side 1131. Further, the reinforcing bars 85 at the upper end of the large-sized reinforcing bars 2 are supported so as to be coaxially aligned with the connecting reinforcing bars 36 protruding from the bottom of the existing wall 31, and are supported using hexagonal couplers, etc. The reinforcing bars are connected one by one via the connecting members 37.

In addition, delicate positioning and adjustment of the reinforcing bar 35 at the upper end of the large-sized reinforcing bar 2 can be done by rotating the hoist 12 to adjust the distance between the hook 10 and the hanging fittings 15 and 16. This is done by changing the In addition, the position of the rope 38 for hoisting the hook 10 is far away from the location where the large-sized reinforcing bars 2 are placed, and therefore, when lifting the large-sized reinforcing bars 2, the existing side wall
1 may get in the way or damage the segment 33.

Next, the pedestal 1 is lowered, but the large-sized reinforcing bars 2 are connected to the existing side wall 31 and are not placed on the pedestal 1, so the center of gravity of the pedestal 1 is as shown in Figure 2. Move from Nihe to 02. As a result, the frame 1 rotates in the direction of the arrow so as to reach the center of gravity or vertically below the hook 10, causing damage to the attached large-sized reinforcing bars 2 or causing the scaffold board to fall. occurs. However, in this embodiment, the distance between the hook 10 and the hanging fittings 15 and 16 is shortened from 11 to 12 by rotating the hoist 12 according to the amount of movement of the center of gravity, as shown by the two-dot chain line in FIG. Since the hook 13 is aligned vertically above the new center of gravity G1 by changing it in this manner, the pedestal 1 is held in a substantially horizontal state without rotating, and therefore the above-mentioned inconvenience is completely avoided. Does not occur.

In addition, in the above embodiment, the center of gravity position is changed by changing the length of the hanging rope.
Without being limited to this, for example, counterweight 1
1 may be moved and adjusted from one end of the pedestal 1 to the other end. In this case, the hanging fittings 15 and 16 for connecting the lobes may be fixedly attached to the other end of the pedestal 1, thereby fixing the hanging position of the υ hook 10. As described above, according to the apparatus for attaching large-sized reinforcing bars according to the present invention, the center of gravity of a frame on which large-sized reinforcing bars are placed at one end and a counterweight is provided at the other end is adjusted to the center of gravity position 11i1f by a mechanism. Since it has a variable configuration, it can be easily installed without being obstructed by the existing side wall.
Even if a segment is installed inside the IllIIk, large-sized reinforcing bars can be hung without damaging the segment, which in turn shortens construction time, saves labor, and reduces construction costs. Southern effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a large-format reinforcing bar installation apparatus according to the present invention, and FIG. 2 is a diagram for explaining its operation. 1... Frame, 2... Large edition #1 Tetsukan, 3
・・・・・・Oban assembly reinforcing bar placement section, 8.9.17.18・
...Rope, 10...Hook, 11...
... Counterweight, 14 ... Center of gravity position change @Shiru, 31 ... Side wall. Applicant Shimizu Corporation-3;

Claims (1)

[Claims] (1) Frame 0 on which the large-sized reinforcing bars ■ are placed at one end)
, a counterway) [, i, i') provided at the other end of the pedestal (1), and a p-plane for hanging the pedestal (1) in a substantially horizontal state from a crane hook (101). A device for attaching large-sized reinforcing bars characterized by comprising a mechanism (8, 9, 17, 18) and a center-of-gravity position changing mechanism (14) for changing the center of gravity position of the pedestal (1). (2 ) The center of gravity position changing mechanism (14) is configured to change the length of the rope when the rope machine 11 (8, 9, 17, 18) suspends it from the frame 0). The installation of large-sized reinforcing bars described in I@All Sections is a device. (8) The center of gravity position 11 changing mechanism (14) is configured to change the arrangement position of the counterweight (11) with respect to the pedestal (1), Large version reinforced steel installation equipment.