JPS6347466A - Method of constructing high concrete structure - Google Patents

Abstract

(57) [Abstract] 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 a method for constructing high concrete structures, and is used for constructing high concrete structures such as high piers, high chimneys, and high-rise wall structures.

Conventionally, there are sliding construction methods and jumping construction methods as methods for constructing this type of structure, and various construction methods are performed using various devices. In the sliding method, the formwork that determines the shape of the concrete slides continuously at a constant speed, and in the jumping method, the formwork and scaffolding are sequentially moved along the wall surface as the poured concrete cures and hardens. Concrete structures are built and constructed continuously by moving lots one by one.

Japanese Unexamined Patent Publication No. 51-138024 describes an improved construction method of the above-mentioned jumping method in which the ruler rod and the formwork are raised and lowered by taking a reaction force against each other, and the ruler rod has a lower end. It extends upward from the scaffolding part and can be fixed to the threaded pipe of the existing concrete part via the upper and lower brackets. A formwork is integrally fixed to the formwork part, and by moving the formwork part back and forth with respect to the ruler rod, the centering and demolding of the formwork is performed. Relative movement of the ruler rod and the formwork in the vertical direction is performed on the worm 2 by a screw rod attached to the ruler frame side and a flange gear whose movement in the vertical direction is restricted on the formwork side.

However, in the above construction method and apparatus, the formwork is integrated with the formwork main body, so the entire formwork must be moved back and forth when setting and removing the formwork. Also,
It is necessary to move the entire formwork back and forth to set and remove the formwork, and the scaffolding cannot be brought close enough to the wall, which increases the moment applied to the fixed part, which is disadvantageous in terms of load support. Become. Furthermore, since the formwork is integrated with the main body of the formwork, it is not possible to take up a sufficient working space when removing and demolding the mold, and it is difficult to clean the surface of the formwork.

Furthermore, a large amount of force is required to move the entire formwork back and forth, making it difficult to ensure the stability of the equipment.
Therefore, the main body of the formwork has to be made smaller, and when raising the scaffolding part with the formwork part locked and fixed to the existing concrete surface, the reaction force is generated at a young position directly below the concrete pouring part. I will take it. Furthermore, if problems with concrete strength are to be avoided, it is necessary to ensure sufficient time for curing of the poured concrete portion, which poses the problem of slowing down the construction speed.

The purpose of this invention is to improve the conventional jumping method.

In this invention, concrete is poured between formworks set up around the concrete wall surface on the existing concrete part, and the formwork and scaffolding are sequentially moved upward one lot at a time as the poured concrete cures and hardens. In the method of constructing a high-concrete structure, anchor metal fittings for fixing the rail members and the scaffolding frame are separately provided for fixing the rail member and the scaffolding frame to the concrete wall surface for each lot. Then, the rail member and the scaffold frame are connected to each other so as to be movable relative to each other in the vertical direction, and each of the rail members and the scaffold frame is fixed to the anchor hardware across a plurality of lots, and the lower end of each is made of concrete. It should be supported at least one lot below the pouring position. Next, the formwork, which is horizontally movably suspended and supported from an arm extending above the scaffold frame, is moved horizontally on the footing of the scaffold frame and set at a predetermined position, concrete is poured and cured, and the formwork is Retract horizontally and remove from the mold.

Next, the fixation of the rail member is released, the rail member is raised one lot relative to the scaffold frame, and is fixed to the anchor hardware for fixing each rail member one lot above, and then the fixation of the scaffold frame is released. Then, the scaffold frame is raised by one lot relative to the rail member and fixed to the anchor hardware for fixing each scaffold frame one lot above. In this way, in this invention, the concrete above is poured in sequence while supporting the rail member or scaffolding frame at a location where the concrete strength is sufficiently developed, which is at least one lot away from the concrete placement location. go.

The present invention will be described below based on illustrated embodiments.

Figure 1 shows an outline of the case where it is applied to the construction of bridge piers, in which several sets of the construction equipment of the present invention (a total of 6 group) are arranged.

The pouring height of concrete 1 is, for example, 3.5 to 1 lot.
5 m, and the - set of equipment can be applied to formworks up to a width of about 6 m. Incidentally, the equipment can be raised by a hydraulic jack 7, which will be described later, and all the equipment arranged on the four sides can be raised at the same time using piping between a hydraulic pump and a hydraulic jack. Additionally, the outside of the device is covered with a safety net or sheet.

Figures 2 to 5 show the configuration of the device used in this invention, in which a column with an inverted-shaped arm 3 is attached to the top of a scaffold frame 2 having a work scaffold, and a guard trolley is attached to this column. A chain block 5 with an attached chain block is incorporated. This lifting device can lift the formwork 6 and also move it horizontally.

The rail member is made up of a pair of rails 12 extending in the vertical direction, and two hanging steel rods 13 provided in the center between the rails 12 and connected in the downward direction at the upper and lower ends.

A hydraulic jack 7 is fixed to the center of the scaffold frame 2, and rail guide rollers (wheels) 1 are installed above and below it.
1 is the installation. Rail 12 on this scaffolding frame 2
is assembled via the guide roller 11, and the rail 12 can be raised (or lowered) via the hanging bar 13 by operating the hydraulic jack 7.

Further, the anchor hardware 8 fixed to the concrete wall surface and the scaffold frame 2 are completely fixed by a key-shaped metal fitting 10 and an anchor steel rod 9.

The rail 12 is also fixed to the anchor hardware 14 by a similar fixing method. The key-shaped metal fittings 10.16 are structured to be attached to the lowest parts of the scaffold frame 2 and the rail 12, respectively.

Furthermore, adjustment jacks 20 and adjustment screws 21 are provided on the scaffold frame 2 and rail 12, respectively, to adjust the height of the wall surface and the device.

In addition, in the figure, 17 is a working floor installed on the arm 3 of the scaffolding frame 2, 1st is a ladder, 19 is a handrail of the working scaffold, 2
2 is a safety net.

FIGS. 6 to 10 show the construction procedure, and the construction procedure will be explained next with reference to these figures.

(1) Figure 6 shows the completion of concrete 1” pouring, and when concrete is poured 1°, the scaffolding frame 2
The rails 12 and 12 remain fixed to anchor hardware 8, 14 provided in the existing concrete 1, respectively.

(2) Figure 7 shows demolding of formwork 6 and anchor hardware 8.1
The installation of item 4 is shown below. After curing of the poured concrete 1', the chain block 5 of the inverted-shaped arm 3 is operated to remove the formwork 6, move it to the outside, and temporarily fix it with a locking tool 23 so that it does not move. Further, since there is a space of approximately 60 cm between the formwork 6 and the concrete wall surface of 1°, the anchor metal fittings 8 and 14 are fixed with high-strength bolts.

(3) Next, as shown in FIG. 8, the rail 12 is raised by one lot and set. First, the anchor steel rod 15 that stops the rail 12 is removed, and when the lifting hydraulic jack 7 is operated, the rail 12 is raised. The hydraulic jack 7 and the hanging steel rod 13 were replaced, the rail 12 was raised by one lot, and the height was adjusted, and the lower rail shear key 16 was fixed in the same manner as described in (2) above.Anchor hardware 1
4, and further fixed to the anchor hardware 14 with an anchor steel rod 15.

(4) Next, as shown in FIG. 9, the scaffolding frame 2 is raised by one lot and set. It can be raised in exactly the same way as the rail 12 was raised. That is, when the anchor steel rod 9 fixing the scaffold frame 2 is removed and the hydraulic jack 7 is operated, the scaffold frame 2 is raised by the guide roller 11. Replace the hydraulic jack 7 and hanging steel rod 13, and replace the scaffolding frame 2 with 1
The lower scaffold frame shear key 10 is brought into close contact with the anchor hardware 8 at a predetermined position and set.

Then, the anchor steel rod 9 is attached to the anchor hardware 8 to adjust the height, and the height adjustment jack 20 is operated to fix it.

(5) FIG. 10 shows how the formwork 6 is set.

Once the rail 12 and scaffolding frame 2 have been raised,
The temporary fixation between the formwork 6 and the scaffolding frame 2 is removed, the chain block 5 is operated, the formwork 6 is suspended, the height is adjusted, and then set.

By repeating the operations (1) to (5) above, concrete structures can be constructed continuously.

FIG. 11 and FIG. 12 show the operation of the hydraulic jack 7 when the rail 12 and the scaffold frame 2 are raised, respectively, and these will be explained next.

(1) Hydraulic jack operation diagram when rail 12 is above 2
6 is the jack stand of the hydraulic jack 7, 27 is the fork,
First, the nut 29 screwed onto the hanging steel rod 13 is applied to the upper side of the fork 27.

In this state, when the jack 7 is pressurized to the tension side, the hanging steel rod 1
3, the rails 12 rise together. At the end of the stroke, the nut 30 is placed against the guide 28, the jack 7 is pressed down, and the jack 7 is replaced. Place the nut 29 on the fork 27 again and repeat the above operation.

(2) Hydraulic jack operation when lifting scaffold frame 2.
When the nut 30 is applied to the fork 27 and the jack 7 is pressed down, the jack 7 and the scaffold frame 2 rise because the hanging steel rod 13 is fixed. At the end of the stroke, place the nut 29 on the jack stand, press the jack 7 to the tension side, and replace the jack 7.

Place the nut 30 on the fork 27 again and repeat the above operation.

The present invention has the above-described configuration and has the following advantages and features.

(1) Since the simple structure of the rail member and the scaffolding frame that goes up and down along it are moved relative to each other using hydraulic jacks installed on the scaffolding frame, the equipment can be operated with less interference or wasted parts. is easy.

(2) The rail members and scaffolding frame shall be supported by separate anchor hardware installed on the concrete wall surface as a reaction force receiver, and shall always be supported on an existing concrete wall surface of sufficient strength that is at least 10 tons away from the concrete placement location. Therefore, construction safety is high.

(3) The formwork is suspended from an arm that extends above the scaffolding frame, and moves horizontally in that state.
The setting and demolding of the formwork can be performed separately and independently from the movement of the scaffolding frame or rail members, and sufficient work space can be secured on the scaffolding frame.

In addition, since it is only suspended and supported by the arm, the formwork is in a free state when the formwork is centered, and its position can be easily adjusted.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a perspective view when applied to the construction of bridge piers, Fig. 2 is a front view showing an overview of the construction equipment, and Fig. 3 shows the right side and Figures 4 and 5 are A-A and B-B cross-sectional views of Figure 2, respectively, Figures 6 to 10 are side views (partial cross-section of the pier) showing the construction procedure, and Figure 11 is the rail elevation. FIG. 12 is an explanatory diagram showing the operation of the hydraulic jack when the scaffold frame is raised. 1.1゛...Concrete, 2...Scaffolding frame,
3... Arm, 4... Guard trolley, 5...
Chain block, 6... Formwork, 7... Hydraulic jack, 8... Anchor hardware for scaffolding frame, 9... Anchor steel rod for scaffolding frame, 10... Shear key for scaffolding frame, 11.・・Guide roller (wheel), 12
...Rail member, 13...Hanging steel rod, 14...Anchor hardware for rail, 14"...Anchor bolt, 15
... Anchor steel rod for rail, 16... Shear key for rail, 17... Work floor, 18... Ladder, 19.
...Handrail, 20...Scaffolding frame height adjustment jack,
21... Rail height adjustment screw, 22... Safety net, 23... Locking tool, 26... Jacket stand, 27...
...Fork, 28...Guide, 29...Summary, 30...Natsuto Construction 12I Fig. 4 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 Fig. 12

Claims (2)

[Claims] (1) Concrete is poured between the formwork installed on the existing concrete area surrounding the concrete wall surface, and the formwork and scaffolding are sequentially moved upward one lot at a time as the poured concrete cures and hardens. In this method, anchor hardware for fixing rail members and scaffolding frames for fixing rail members and scaffolding frames to a concrete wall surface is provided separately for each lot, and the rail members and scaffolding The frames are connected to each other so that they can move relative to each other in the vertical direction, and the rail members and scaffolding frames are each fixed to the anchor hardware across multiple lots, and each lower end is at least one lot below the concrete placement position. Next, the formwork, which is suspended and supported horizontally from an arm extending above the scaffold frame, is moved horizontally on the footing of the scaffold frame and set in a predetermined position, and concrete is poured. After curing, the formwork is moved back horizontally to remove the mold, and then the rail member is released from the fixation, and the rail member is raised by one lot relative to the scaffolding frame, and each lot above each lot is removed. Fix it to the anchor hardware for fixing the rail member, then release the fixation of the scaffold frame, raise the scaffold frame one lot relative to the rail member, and fix it to the anchor hardware for fixing each scaffold frame one lot above. A method of constructing a high-concrete structure, which is characterized by sequentially pouring concrete from above. (2) A method for constructing a high concrete structure according to claim 1, which simultaneously raises a plurality of scaffold frames installed surrounding a concrete wall surface.