JPS6152306B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for large circular silos, etc., and a device for carrying out the construction method, in which a Goliath crane is advanced at a predetermined speed while concrete is continuously poured. The present invention relates to a traveling form construction method and a traveling form device for a large circular wall that slides in the horizontal direction.

Conventionally, the construction method for large circular open silos used for coal storage, etc., involved constructing temporary scaffolding on both sides of the concrete wall.If the concrete wall was high, temporary scaffolding was required. The height of the scaffolding necessitated the use of restraint wire to prevent the scaffolding from tipping over, which required a great deal of labor. In addition, during typhoons, there was a risk of falling due to wind pressure, which was a safety issue.

In addition, conventional formwork construction methods involve moving large, unitized panels horizontally and vertically using temporary scaffolding installed on both sides of the concrete wall, or installing them externally. A lifting machine was used to move large panels horizontally and vertically, and the panels were installed. This method had safety issues because it required work in a small space. Moreover, if the large unitized panels were heavy, the temporary scaffolding would need to be reinforced, and since the temporary scaffolding itself was not a rigid structure, setting up the large panels was complicated, resulting in poor concrete finish accuracy.

Furthermore, the reinforcing bars in these construction methods are set by lifting unitized reinforcing bars using a lifting machine installed outside.
It takes time to set up the reinforcing bars, which poses problems in terms of installation accuracy and safety. In addition, when pouring concrete, if the wall is high, pump piping is required, and the piping must be replaced each time. There were some drawbacks, such as the large amount of effort required. On the other hand, while it is known that Goliath cranes are installed in areas that cover the entire workplace during construction work at nuclear power plants and used as general-purpose machines for lifting, transporting, etc., there have been no examples of their use as a construction method.

The present invention was made in order to improve the drawbacks of the conventional construction method described above, and a Goliath crane is placed astride a concrete lower structure, and a support framework work scaffold is installed inside the legs of the Goliath crane. The present invention provides a traveling form construction method for large circular walls, which enables efficient and safe construction by sequentially attaching a formwork device consisting of reinforcement scaffolding and formwork, and using the entire structure as a "moving formwork", as well as its device. be.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Of the accompanying drawings, Figure 1 is a front view of the equipment for carrying out the construction method according to the present invention in a set state, and Figure 2 is a side view of the same. A Goliath crane 2 is installed on rails 3,3. The type of Goliath crane 2 is not limited to that illustrated. The concrete lower structure 1 constitutes the lower part of a large circular wall to be constructed, and is formed in a ring shape on the foundation on which this large circular wall is to be constructed. be. Furthermore, it goes without saying that the rails 3 of the Goliath crane 2 are laid parallel to the lower structure 1 on both sides of the lower structure 1.

2 of the left and right legs 2 of the above Goliath crane 2
A pair of formwork devices 8 are respectively mounted at opposing positions inside A and 2B so as to be movable up and down. The formwork device 8 is connected to the leg portion 2 of the Goliath crane 2.
A, a rack-pinion elevating guide rail 4 arranged inside the elevating guide rail 4, a support framework 5 provided so as to be able to rise and fall freely with respect to the elevating guide rail 4, and a lower part mounted on the supporting framework 5 via a hydraulic jack 9. A formwork 7 provided movably in the width direction of the structure 1 (horizontal direction in FIG. 1) and a temporary scaffolding 6 disposed on the supporting framework 5
A and a reinforcement scaffold 6B.

The formwork 7 of the formwork device 8 can be set by hydraulic jacks 9 on the support framework 5 in accordance with the wall thickness. Also,
A lifting machine 10 such as a jib crane or a trolley hoist is attached to the upper beam of the Goliath crane 2, and is capable of traveling on the beam to lift pre-assembled reinforcing bars 11 and other various equipment. C in the figure is a regular cable power supply for Goliath cranes.

The construction method of continuously pouring concrete using the Goliath crane 2 equipped with the formwork device 8 configured as described above generally involves placing a large circular wall body as shown in Fig. 3. A concrete substructure 1 constituting the lower part of a large circular wall is formed in a ring shape on the foundation to be constructed, and then rails are installed on both sides of the substructure 1 in parallel with the substructure 1. At the same time, a Goliath crane 2 is movably arranged on the rail 3 straddling the lower structure 1, and while the Goliath crane 2 is advanced on the rail 3 at a predetermined speed, a normal formwork 7 using the means of
Place concrete in between. At the same time as this work, the pre-assembled reinforcing bars 11 are hoisted in front of the Goliath crane 2, and the embedded reinforcing bars 12 are pre-jointed. When construction of one stage of large circular concrete wall is completed by going around the concrete lower structure 1, the entire formwork device 8 is raised one stage as shown in Figs. 4 to 7, and the above-mentioned Repeat the construction method. The special conditions at the start of the first stage construction may be in accordance with the general traveling form construction method.

When raising the formwork device 8, either slide the formwork device 8 over the already poured part and then raise it, or stop it for a predetermined period of time after going around and wait for the concrete to harden. The formwork device 8 is moved backward by the operation of the hydraulic jack 9, removed from the mold in an out-of-plane direction, and raised accurately by the guide rail 4 and the rack pinion of the formwork device 8, and then opposed at the next stage position. It is.

After the device 8 is raised to a normal position, a hydraulic jack 9 installed on the device is operated to set the formwork 7.

In addition, as a modification of the above construction method, the foundation or the first stage of the wall is prepared at a diagonal height of one step per circumference, and the Goliath crane 2 moves forward in the above method, and the legs 2
There is also a method in which the continuous lifting of the device in A is carried out continuously to construct the wall continuously in a spiral shape.

According to this method, after one lap along the silo wall, there is no need for a hardening period for the formwork to rise, or there is no need for concrete damming at the starting end after the rise, and the mobility of the Goliath crane is improved. and the effect of mechanization of equipment can be achieved at the same time.

In addition, the lower structure 1 made of concrete generally has a tapered cross section that is thin at the top and thick at the bottom.
Although there are many designs in which a ring beam is provided at the top, it can be freely adjusted by moving the hydraulic jack 9 that is attached to the seventh embodiment. In addition, convenience during construction,
It is necessary to provide an opening in a part of the wall that connects the inside and outside for loading and unloading and passage of people during use, but in this case, use PC material and build it next to the opening. , construction can be carried out with an open gap.

As explained in detail above, according to the traveling form construction method according to the first invention, the concrete lower structure constituting the lower part of the large circular wall is attached to the base on which the large circular wall is to be constructed. straddle this lower structure,
A formwork device in which a Goliath crane is arranged, and rack-pinion type lifting guide rails, support framework, work scaffolding (temporary scaffolding, reinforced scaffolding), and formwork are arranged in this order inside the left and right legs of the Goliath crane. While moving the Goliath crane forward, concrete is continuously poured into the formwork, and the concrete pouring work is carried out one step at a time or by moving the formwork one step at a time using a rack and pinion. The structure is constructed so that the wall is constructed by repeatedly layering concrete each time it is raised at the same time as the concrete moves forward, so it is possible to build a tall concrete wall using attached equipment (temporary scaffolding), which is not required in conventional construction methods. etc.), construction can be carried out efficiently and safely while maintaining high accuracy.

Further, according to the device of the second invention, there are the following excellent effects.

(a) Since the formwork device is attached to the legs of the Goliath crane so that it can be raised and lowered, it is possible to achieve safe construction without the risk of it falling over due to wind pressure during typhoons.

(b) Hydraulic jacks are used to push and pull the formwork, movement in the circumferential direction is performed by the movement of a Goliath crane, and a rack pinion type attached to the inside of the leg of the Goliath crane is used to move the formwork in the vertical direction. Since it uses a lifting guide rail, there is no left-right vibration or positional fluctuation during movement, and the prevention of vibration and positional fluctuation is effective. Once the position of the Goliath crane is determined, large panels (formwork) The position of is also determined,
High precision walls can be formed.

(c) Regarding reinforcing work, if the imported reinforcing bars are placed directly on the temporary scaffolding of the Goliath crane and assembled in pieces, it is possible to use a trolley hoist installed on the beam. Implement methods such as pre-assembling reinforcing bars within the reach of a trolley hoist and hoisting and setting them using the trolley hoist, or pre-assembling reinforcing bars and installing them on a temporary scaffold fixed to a Goliath crane. I can do it. According to this device, any reinforcement arrangement method can be used safely and without complicating the work.

As described above, according to the traveling form construction method and traveling form device of the present invention, it is possible to provide a construction method that is reasonable and safe for concrete pouring of large circular silos and the like.

[Brief explanation of the drawing]

FIG. 1 is a front view of a schematic apparatus showing a construction method according to an embodiment of the present invention, FIG. 2 is a side view of the same, and FIGS. 3 to 7 are front views illustrating a construction order according to the present invention. . 2...Goliath crane, 2A, 2B...legs, 3...rail, 4...lifting guide rail, 6
A... Temporary scaffolding, 6B... Reinforced scaffolding, 7... Formwork, 8... Formwork device, 10... Lifting machine.

Claims (1)

[Scope of Claims] 1. A concrete substructure 1 constituting the lower part of the large circular wall is formed in a ring shape on a foundation on which the large circular wall is to be constructed, and then the substructure Rails 3, 3 are laid on both sides of the body 1 in parallel with the lower structure 1, and the rails 3,
3, a Goliath crane 2 is movably disposed across the lower structure 1, and a pair of formwork devices 8 are movably moved up and down, respectively, at opposing positions inside the left and right legs 2A, 2B of the Goliath crane. A method of constructing a large circular wall body by placing concrete on the lower structure 1 and stacking it using a pair of formwork devices 8 while moving the Goliath crane 2 forward. , the formwork device 8 is mounted on a rack-pinion type elevating guide rail 4 disposed inside the legs 2A, 2B of the Goliath crane 2, and a support framework 5 provided so as to be movable up and down with respect to the elevating guide rail 4. , a formwork 7 provided on the support framework 5 so as to be movable in the width direction of the lower structure 1 via a hydraulic jack 9, and a temporary scaffold 6A and a reinforced scaffold 6B disposed on the support framework 5. After setting the inner and outer formworks 7, 7 according to the wall thickness of the lower structure 1 using the hydraulic jack 9, preliminary joint work of the embedded reinforcing bars 12 is performed in front of the formworks 7, 7. At the same time, the Goliath crane 2 is moved forward on the rails 3, 3 at a predetermined speed, and concrete is poured continuously. A traveling form construction method for a large circular wall body, characterized in that the movement is repeated each time the formwork is raised by the rack pinion of No. 5, either one step at a time or simultaneously as the formwork advances. 2. Form a ring-shaped concrete substructure 1 constituting the lower part of the large circular wall on the foundation on which the large circular wall is to be constructed, and pour concrete on top of the substructure 1. , a stacking device, comprising rails 3, 3 laid parallel to the lower structure 1 on both sides of the lower structure 1;
3, a Goliath crane 2 movably disposed astride the lower structure 1, a formwork device 8 disposed opposite to each other inside the left and right legs 2A, 2B of the Goliath crane 2, and the Goliath The formwork device 8 includes a lifting machine 10 that is movably installed on the upper beam of the crane 2 along its longitudinal direction, and the formwork device 8 is connected to the leg portion 2 of the Goliath crane 2.
A, a rack-pinion type lifting guide rail 4 arranged on the inside of 2B, a supporting frame 5 provided to be able to rise and fall freely with respect to the lifting guide rail 4, and a hydraulic jack 9 mounted on the supporting frame 5. It is characterized by being composed of a formwork 7 provided movably in the width direction of the lower structure 1, and a temporary scaffolding 6A and a reinforcement scaffolding 6B arranged on the supporting framework 5. A traveling form device with a large circular wall.