JPH0550405B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is mainly used to manufacture long and heavy rigid structures such as precast girders made of prestressed concrete (hereinafter referred to as PC) in manufacturing yards or stockyards. The present invention relates to a method for moving a long heavy object and an apparatus therefor.

(Prior Art) Generally, precast PC girders are manufactured in a production yard near the erection site, and the stocked items are placed on a trolley on a transport rail and transported to another location such as the erection site.

Conventionally, as a method of moving the product from the production yard or stockyard to the cart on the transport rail, there is a method of using rollers as shown in FIGS. 10 to 14. This method begins with the 11th
As shown in the figure, jack sandals 1 and 1 were placed on both sides of the PC girder A, and hydraulic jacks 2 and 2 were installed on top of them, respectively, and fixed to the PC girder A as shown in Fig. 12. By pushing up the brackets 3, 3 with their hydraulic jacks 2, 2, the PC girder A is raised, and then the sandals 5 for lateral movement reach the conveyor rail 4 under the raised PC girder A. Insert that Sandle 5 on and PC
A roller moving device consisting of a pair of receiving plates 6, 6 and rollers 7, 7 interposed between them is inserted between the girders A,
After loading the PC girder A on top of it, remove the jacks 2 and the sandals 1 as shown in Fig. 13.
With the PC girder A held by anti-falling members 8, 8, etc., the PC girder A is moved laterally on the sandals 5 to the top of the carriage 9 of the transport rail 4.

Then, at that position, as shown in FIG. 14, set the jacking sandle 1 and hydraulic jack 3 again, lift the PC girder A, remove the roller moving device and the sandal 5, and then lower it onto the trolley 9. ing.

A second method is to use a fixed gate type crane for heavy objects as shown in FIGS. 15 to 18. As shown in Fig. 15, this method uses a fixed gantry crane 11 different from the general-purpose gantry crane 10 used for transporting formwork, etc. in the manufacturing yard. As shown in Figures 17 and 18, fixed gate type cranes 11, 11 for heavy loads are installed at both ends of PC girder A, spanning the PC girder installation position and the transport rail 4. The girder hanging fittings 12 are fixed to both ends of the PC girder A, and supported on the lower end of the hanging steel rod 14 of the lifting center hole jack 13 which is movably provided on the fixed gate crane 11. It is lifted up by a lever 13, moved laterally, and lowered onto a cart 9.

(Problems to be Solved by the Invention) Among these conventional moving methods, the former method using rollers has the following problems.

(1) The jacking sandals must be reassembled each time the girder is lifted and lowered, which increases the number of man-hours and requires a lot of labor and time.

(2) Since the sandals and jacks are stacked, there is a risk that the jack head and the bottom of the bracket may slip, or the sandals may collapse, causing the girder to fall.

(3) There is a risk that the fall prevention material may come off during lateral movement, causing the girder to fall.

(4) Most of the various tasks are done manually by inputting information, so many people are required.

(5) The center of gravity of the girder is located at the top, making the work unstable and dangerous, and requires the skill of the workers.

The latter method of using a special fixed gate type crane for heavy objects has the following problems.

(b) When assembling a fixed gate type crane on site,
It is dangerous as it involves working at heights.

(b) It is uneconomical as it requires support from a large number of personnel and heavy machinery.

(c) Gate type cranes are quite large in terms of structure and weight, so when installing and removing heavy machinery, a large and powerful crane is required, and the work is dangerous due to the heavy weight. The sex is great.

(d) Furthermore, the exclusive area for storage after use is large;
The girder production yard cannot be used effectively.

(E) When lifting and lowering girders is performed electrically, notification as a crane, inspection, and operating qualification are required.

The present invention has been made to solve the problems of the conventional methods as described above.

(Means for Solving the Problems) The gist of the present invention for solving the conventional problems as described above is to lift a long heavy object A such as a precast PC girder and transport it horizontally, In the method for moving a long heavy object to be placed on a trolley, a pair of auxiliary rails 44, 44 for lateral feeding are installed at both ends of the long heavy object A to the outside of the end surface, respectively, and intersect with the transport rail 41. , On each of the auxiliary rails 44, 44, the rail 4
4, wheels 22, 22 that can run freely on the top of the 4, and a cantilever type heavy object support arm 2 that projects in a substantially horizontal direction.
9, and a jack 2 for raising and lowering the support arm 29.
a pair of cantilevered legs 20, 2, each having a
0 is loaded with both the heavy object support arms 29, 29 facing each other, and the heavy object support arms 29, 29 of each of the cantilever support legs 20, 20 are fixed to both ends of the elongated heavy object A. After that, both the heavy object support arms 29, 29 are raised by the respective jacks 27, 27 to lift the long heavy object A, and then the long heavy object A is transported laterally on the auxiliary rails 44, 44. A method for moving a long object (claim 1) and lifting a long heavy object A such as a precast PC girder,
In a long object moving device that moves on a rail in a direction intersecting the long heavy object A, auxiliary rails 44, 44 provided in parallel to each other outside both ends of the long heavy object A; A pair of cantilever support legs 2 loaded on rails 44, 44
0, 20, and the cantilever support legs 20, 20 include a base 21 having wheels 22, 22 on the bottom surface thereof that run on the auxiliary rail 44, respectively, and a base 21 that projects horizontally from the base 21. a cantilever type heavy object support arm 29; a jack 27 for raising and lowering the heavy object support arm;
and fixing means 31 for fixing an end of the elongated heavy object A to the heavy object support arm 29. A long object moving device (claim 2) characterized in that the devices are arranged in opposite directions.

(Function) In the heavy object moving method and device of the present invention, the long heavy object is a beam having sufficient rigidity;
By fixing the cantilever-supported heavy object support arm leg to this and lifting it, the long heavy object itself becomes a main frame for lateral movement, and the entire object becomes a moving body with wheels, allowing it to be lifted in a stable state, moved laterally, and The work of lowering it onto the trolley is done.

(Example) Next, an example of implementation of the present invention will be described with reference to the drawings.

1-4 illustrate a shaped cantilevered leg 20 according to the present invention. This cantilevered leg is I
It has a base 21 made of shaped steel, and wheels 22, 22 are provided below both ends of the base 21 to be rotatable about shafts 23, 23. Hollow prismatic pillars 24, 24 are erected on the upper surface of both ends of the base 21, and a vertical frame 25 is provided along these pillars 24, 24 so as to be movable up and down. The vertical frame 25 integrally has a pair of sliding tubes 26, 26 fitted to the outside of the pillars 24, 24 so as to be vertically movable on both sides, and the top of the sliding tube 26 and the top surface of the base 21 are connected to each other. A hydraulic jack 27 is interposed between the vertical frame 25 and the vertical frame 25 as a whole by raising and lowering the sliding tube 26 with respect to the base 21 using the hydraulic jack 27. Note that both ends of the hydraulic jack 27 are spherical bodies 28a as shown in FIG.
and are connected via a universal joint 28 using a spherical seat 28b. In addition, the support column 24 and the sliding tube 26
The lock pin insertion holes 34, 3 are inserted through both.
5 is formed, and by inserting a lock pin 36 at an appropriate relative position between the two, the two are fixed.

At the upper end of the vertical frame 25, there is a heavy object support arm 2 which is oriented substantially horizontally and perpendicular to the base 21.
9 is integrally provided in a protruding manner. This heavy object support arm 29 is shaped like a hollow box made of steel, and has a large number of reinforcing ribs 30, 30, . . . integrally fixed on its outer surface. A long heavy object fixing means consisting of vertically oriented heavy object fixing shafts 31, 31 is provided slightly closer to the tip side than the base end of the heavy object support arm 29. Both vertical axes 3
1 and 31 pass through shaft fixing protrusions 32 and 32 on both sides of the heavy object support arm 29 and are suspended therefrom. Further, a pad 33 is fixed to the bottom surface of the tip of the heavy object support arm 29 for abutting against the upper surface of the heavy object and absorbing a reaction force.

Next, a method of moving the precast PC girder A using the above-mentioned cantilever support legs 20 will be explained with reference to FIGS. 5 to 9.

In the figure, 40 is the PC girder manufacturing base, and 4
1 is a transport rail, 42 is a truck that runs on the rail 41, and 43 is a general-purpose simple gate type crane used when manufacturing PC girders.

First, as shown in Figure 5, the PC girder manufacturing base 40
A pair of auxiliary rails 4 for cross-feeding run over the transport rails 41 from positions slightly outside both ends of the upper PC girder A.
Lay 4,44. When laying this auxiliary rail, a part of the transport rail 41 may be removed as shown in FIG. 5, or it may be laid across the transport rail 41 without being removed, although this is not shown. Good too.

Next, as shown in FIG.
9 is fixed to the brackets 3, 3 at both ends of the PC girder A using the fixed shaft 31, respectively. Thereafter, the hydraulic jack 27 is extended to place the wheels on the auxiliary rail 44, and when the hydraulic jack 27 is further extended, the PC girder A itself becomes a main frame and is lifted as shown in FIG. In this state, the lock pin 36 is inserted into the lock pin insertion holes 34, 35 of the column 24 and the sliding tube 26, and the hydraulic pressure of the hydraulic jack 27 is released to allow the lock pin 36 to receive the load.

With PC girder A lifted in this way,
Using the chill holes 45, 45..., move the cantilever support legs 20, 20 slowly on the auxiliary rails 44, 44, and move the PC girder A to the trolley 4 of the transport rail 41.
Move horizontally to 2,42 and stop. Then, the hydraulic jacks 27 of both cantilever support legs 20, 20 are slowly retracted to lower the PC girder A, and the trolleys 42, 4
2 Place it on top. As shown in FIG. 9, after supporting the cantilever support legs 20, 20 using a fall prevention material 46 and the like, a portal crane 43 is used to
At the same time, the auxiliary rails 44, 44 (not shown) are removed, and the partially removed transport rail 41 is installed, and then the cart 42 is run and carried out.

In addition, in the above-mentioned embodiment, the cantilever support legs 20, 20
Although it is designed to be moved by external force, it may also be self-propelled, and long heavy objects to be moved may be
In addition to the PC girder, the present invention can be practiced as long as it has sufficient rigidity and can be supported at both ends.

(Effects of the Invention) The method and apparatus of the present invention are configured as described above,
The following effects can be obtained by fixing cantilever support legs having a heavy object support frame that can be raised and lowered by a jack to both ends of a long heavy object to raise and lower the object.

(a) Since lifting, lowering, and moving can be done with a single piece of equipment, there is no need to assemble sandals and there is no risk of collapse due to this, and since the jacks will not come off, there is no risk of girder overturning. Furthermore, there is no work such as assembling the sandals and replacing them with horizontally moving metal fittings, which saves time and reduces the number of personnel, which is economical.

(b) Since it is suspended from above the center of gravity of the girder, it has great stability in the direction of movement, eliminates the need for fall prevention materials, and is highly safe, so it does not require skilled personnel.

(c) The cantilever support legs for transportation can be made relatively small and lightweight, so they can be easily lifted and moved using a portal crane, resulting in labor savings and high efficiency.

(d) When assembling on-site, there is less dangerous work in a single hour and it can be done by a small number of people.

(e) Cantilever support legs for transportation are relatively small and lightweight, allowing for the downsizing of portal cranes and heavy machinery, as well as lowering the risk of crane work and requiring less space for storage after use. Since the girder manufacturing yard can be used effectively and the equipment is small, it is generally economical.

(f) Even if the lifting and lowering work is performed using an electric hydraulic pump, it is not treated as a crane, and no notification, inspection, or operating qualification is required.

[Brief explanation of drawings]

Figures 1 to 4 show examples of cantilever support legs used in the present invention, with Figure 1 being a plan view, Figure 2 being a side view, Figure 3 being a front view, and Figure 4 being a front view. 5 is an enlarged cross-sectional view of the jack attachment part, FIGS. 5 to 9 show examples of the method of the present invention, FIG. 5 is a plan view of the whole, and FIG. 6 is a side view of the cantilever support leg attachment process. Figure 7 is a side view of the lifted state, Figure 8 is an enlarged side view of the same part, Figure 9 is a partial perspective view showing the state after loading onto the trolley, and Figures 10 to 14 are the first conventional example. 10 is a plan view of the whole,
Figure 11 is a front view showing the state before lifting the PC girder, Figure 12 is a front view showing the state after lifting,
Fig. 13 is a front view during lateral movement, Fig. 14 is a partial perspective view of the vehicle being lowered to the cart, Figs. 15 to 18 show the second conventional example, and Fig. 15 is the overall plan view. 16 is a front view of the heavy gantry crane in the installed state, FIG. 17 is a front view showing the PC girder in the lifted state, and FIG. 18 is a front view showing the lowered state. 20... Cantilever support leg, 21... Base, 22...
Wheel, 24... Support, 25... Vertical frame, 26
... Sliding tube, 27 ... Hydraulic jack, 28 ... Universal joint, 29 ... Heavy object support arm, 31 ... Heavy object fixing shaft, 32 ... Shaft fixing part, 33 ... Pad, 40 ... PC Girder production base, 41...Transportation rail, 42...Dolly, 43...Gate type crane,
44... Auxiliary rail, 45... Chill hole.

Claims (1)

[Scope of Claims] 1. A long heavy object moving method in which a long heavy object A such as a precast PC girder is lifted, transported horizontally, and placed on a trolley on a conveyor rail 41, in which both ends of the long heavy object A are A pair of auxiliary rails 44, 44 for cross-feeding, which intersect with the conveyance rail 41, are installed on the outside of the end faces thereof, and on each of the auxiliary rails 44, 44,
4, wheels 22, 22 that can run freely on the top of the 4, and a cantilever type heavy object support arm 2 that projects in a substantially horizontal direction.
9, and a jack 2 for raising and lowering the support arm 29.
a pair of cantilevered legs 20, 2, each having a
0 is loaded with both the heavy object support arms 29, 29 facing each other, and the heavy object support arms 29, 29 of each of the cantilever support legs 20, 20 are fixed to both ends of the elongated heavy object A. After that, both the heavy object support arms 29, 29 are raised by the respective jacks 27, 27 to lift the long heavy object A, and then the long heavy object A is transported laterally on the auxiliary rails 44, 44. How to move long objects. 2. In a long object moving device that lifts a long heavy object A such as a precast PC girder and moves it on a rail in a direction that intersects with the long heavy object A, there is a long object moving device parallel to both ends of the long heavy object A. Auxiliary rails 44, 44 provided in the arrangement and a pair of cantilever support legs 2 loaded on each of the auxiliary rails 44, 44
0, 20, and the cantilever support legs 20, 20 include a base 21 whose bottom surface is provided with wheels 22, 22 that run on the auxiliary rail 44, respectively, and a base 21 that projects horizontally from the base 21. a cantilever type heavy object support arm 29; a jack 27 for raising and lowering the heavy object support arm;
and fixing means 31 for fixing an end of the elongated heavy object A to the heavy object support arm 29. A long object moving device characterized by being arranged in directions facing each other.