JPS603360A - Construction of hollow concrete 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] (Industrial Application Field) This invention relates to a method for constructing a hollow concrete structure, particularly a method for lifting formwork inside a hollow concrete wall.
It is mainly used for constructing hollow high concrete structures whose cross sections are not that large compared to their height, such as hollow cross-section bridge piers and high chimneys.

(Prior art) Conventionally, when constructing this type of structure, there are sliding form construction methods, jumping construction methods, etc. as formwork construction methods for the outside of the wall, and various construction methods have been developed using various equipment. .

In the sliding form method, the formwork that determines the shape of the concrete moves continuously at a constant speed, and in the jumping form method, the formwork and scaffolding are moved sequentially onto the wall as the poured concrete cures and hardens. Concrete structures are constructed continuously by moving 10 points at a time along the line.

However, it is difficult to apply the conventional sliding construction method as is to the formwork inside the wall, and the scaffolding construction method has many problems in terms of workability, safety, etc.

(Objective of the Invention) This invention was developed under the above circumstances, and an object thereof is to provide a method for constructing a hollow concrete structure using an inner formwork, and to facilitate reliable and safe construction. It is an object.

(Structure of the Invention) In the construction method according to the present invention, a central post is positioned by a guide beam supported via a hanging member and a guide roller provided at the center of the hanging beam, and the hanging beam is raised to a predetermined height. After fixing, the center post is raised, the formwork is set on the top of the center post, and the operations of pouring concrete and demolishing are repeated every 10 steps. At this time, it is necessary to set formwork every 10 pieces for the outside of the wall as well, but for the outside, conventional construction methods, such as Japanese Patent Application No. 57
The construction can be carried out using the method and equipment of No. 7880, as well as other methods and equipment that are variations on the jumping form construction method described above.

As described above, in the construction method of the present invention, the central post is supported by a hanging beam via a hanging member such as a steel rod. The suspension beam is placed on anchor hardware fixed to the inside of the wall. 2. Anchor hardware from the wall under construction. Attach to the wall under the loft. Therefore, the vertical load of the central post, suspension beam, etc. is not applied to the unhardened or young concrete wall, but is supported by the wall that has already hardened and has sufficient strength, resulting in high safety.

To raise the center post, first raise the suspension beam by 10 points, then hang the suspension material from the suspension beam, fix the lower end of the suspension material to the cradle of the center post, and use the hydraulic pressure installed on the suspension beam. This is done by raising the hanging material using a jack.

The central post is equipped with an integrated inner scaffolding and work floor, making it possible to efficiently set up formwork, take it down, and perform other tasks. The demolded formwork is lifted up while remaining on the work floor.

On the work floor, workers can operate the formwork and perform other tasks such as fixing the center post.

Next, the configuration of the second construction method according to the present invention will be explained.

The difference from the above method is that the inner scaffold frame is raised by taking the reaction force from the hanging material directly attached to the anchor hardware, without using a beam such as a hanging beam.

An elevating and lowering inner scaffolding frame is suspended and supported by hanging materials using a plurality of anchor hardware attached to the inside of a hollow concrete wall as support points, and is fixed in a predetermined position. The inner scaffold frame is integrally equipped with two upper and lower working floors and a formwork lifting device.

The formwork is set using the formwork lifting device, and after concrete is poured, the formwork is removed.

After demolding, the hanging material hanging from the anchor metal fittings attached to the 10 anchor metal fittings that suspend and support the inner scaffold frame is attached to the inner scaffold frame. It is raised by 10 points using a hydraulic jack for raising and lowering along the inside.

In the same way, concrete is poured every 10 holes, and the upper hollow concrete wall is successively constructed.

Next, the configuration of the sixth construction method according to the present invention will be described.

This construction method is almost the same as the second construction method regarding the inner wall, but is characterized by raising the inner scaffold frame at the same time as the outer scaffold frame for constructing the outer wall is raised.

In other words, after the wall work such as formwork setting, concrete pouring, and demolding is completed, pulleys are installed at the upper and lower positions of the steel frame that protrudes from the top of the wall, wire ropes are passed through, and the wire ropes are connected to the outer scaffolding frame. and the inner scaffold frame. Then, by raising the outer scaffold frame using a lifting device such as a hydraulic jack, the inner scaffold frame is raised.

Thereafter, concrete is poured every 10 holes in the same manner, and the upper hollow concrete wall is successively constructed.

(Example) Next, the illustrated embodiment will be described.

FIG. 1 shows an example of the first construction method according to the present invention.

Anchor hardware 2.21 is installed inside the existing hollow concrete wall 1 at a predetermined interval, and the anchor hardware 2.
A suspension beam 4 and a guide beam 3 are installed on top of the suspension beam 21. Guide rollers 5 and 51 for positioning the center post 7 are provided at the center of the hanging beam 4 and the guide beam 3.

A steel rod 6 is suspended from the center of the hanging beam 4, the lower end of the steel rod 6 is fixed to a central post, and the central post 7 is supported by the hanging beam. The upper end of the steel rod 6 is connected to a hydraulic jack 8 installed on the suspension beam 4, and by operating the hydraulic jack 8, the central post 7 is raised and lowered.

A work floor 9 is integrally provided with the central post 7, and work such as formwork installation, concrete pouring, demolding, etc. is performed on this work floor. In addition, an inner scaffold 7b is provided for assembling the steel frame 21 and reinforcing bars.

The suspension beam 4, the guide beam 3, and the work floor 9 are provided with a set screw 10 and a set screw 11 for adjusting the gap between them and the inside of the wall, so that no rattling occurs. Also, these hanging beams 4. The guide beam 3 and the work floor 9 have a structure that allows them to expand and contract as the cross section of the hollow wall changes.

Figures 2 to 7 show an example of the construction procedure, and the work is carried out in the following steps.

(1) As shown in FIG. 2, the vertical load of the center post 7 is carried out by suspending the pedestal 7a with a steel rod 6 and supporting it on the anchor hardware 2 via the hanging beam 4.

The overturning moment is supported at the upper part by a set screw 101 via a guide roller provided on the guide beam 3, and by the set screw 10 at the lower part via a guide roller provided at the hanging beam 4.

(2) As shown in FIG. 5, the central post 7 is lowered by operating the hydraulic jack 8, and the work floor 9 is supported by the anchor hardware 21 via the pedestal 13 and guide rollers 51. Since the work floor 7b and the center post 7 are fixed,
In this state, the entire load of the center post and the weight of the guide beam are transferred to the anchor hardware 2.

Since the work floor 9 and the formwork 12 are connected, the formwork is demolded by the weight of the center post when the center post is down.

(3) As shown in FIG. 4, use the chain block 15 to move the hanging beam 4 onto the anchor hardware 10 points above.

Place the anchor hardware 2 on the workbench 14.

The formwork 12 is processed in the width direction during the suspension beam replacement work described above.

(4) As shown in FIG. 5, operate the hydraulic jack 8 to support the vertical load of the center post 7 on the anchor hardware 2 via the hanging beam 4.

Furthermore, the jack 8 is operated to raise the overturning moment of the center post 7 while being supported by the upper and lower guide rollers 5° 5'.

(5) As shown in figure m6, after the center post has been raised, adjust the set screws 11 to position the inner scaffolding, and then set the formwork 12.

(6) Replace the guide hanger 3 with the chain block 15 as shown in FIG. In addition, the work of replacing the guide beams is as follows:
This can be done during formwork setting or concrete pouring.

FIGS. 8 and 9 show an example of the second construction method according to the present invention.

An inner scaffolding frame 17 is suspended and supported at the center of the wall 1 by a steel rod 6 using an anchor hardware 2 attached to the inside of the hollow concrete wall 1 as a support point. Inner scaffolding frame 1
7 is integrally provided with work floors 17a, 17b and a formwork lifting device 18, and a screw telescoping roller 16 is attached to the outside of the work floors 17a*17b. The inner scaffold frame 17 is raised by operating a hydraulic jack 8 attached to the lower work platform 17t).

In addition, there is a screw telescopic roller 16 attached to the outside of the work floor.
Therefore, it is possible to move up and down along the inside of the wall 1 while always maintaining the position of the center of gravity.

Further, the working floors 17a and 17b and the formwork lifting device 18 have a structure that allows them to expand and contract as the cross section of the hollow wall changes.

Next, the lifting work will be explained.

First, the formwork 12 is suspended by the formwork lifting device 18, and the formwork is removed from the wall 1 and lowered onto the work floor 17a.

Next, attach the anchor hardware 2' to the 10 t upper part of the anchor hardware 2.
and set the steel rod 6'. Activate the hydraulic jack 8, remove the anchor metal fitting 2 and steel rod 6 at the lower position after raising it a little, and operate the hydraulic jack 8 again to apply a reaction force to the steel rod 6' hanging down from the anchor metal fitting 2' at the upper position. and raise the inner scaffolding, frame 17, by 10 points.

FIGS. 10 and 11 show an example of the third construction method according to the present invention.

An inner scaffold frame 19 and an outer scaffold frame 20 are installed on both the inner and outer sides of the hollow concrete wall 1, respectively. The inner scaffold frame 19 has almost the same shape as that of the second construction method, and is suspended and supported by steel rods 6 from anchor hardware 2 installed in the wall 1.

Next, the lifting work will be explained. First, pulleys 22 and 25 are attached to the upper and lower parts of the steel frame 21 embedded in the wall 1, and the wire rope 24 is passed through the pulleys 22 and 25.

Next, the outer scaffold frame 20 and the inner scaffold frame 19 are connected with a wire rope. Thereafter, the outer scaffold frame 20 is slightly raised using a lifting device such as a hydraulic jack (not shown), and then the anchor hardware 2 and the steel rod 6 are removed.

When the outer scaffold frame 20 is raised, the inner scaffold frame 19 is also raised at the same time.

After the lifting work is completed, the anchor hardware 2 and steel rod 6 are attached, the inner scaffold frame 19 is fixed, and then the wire rope 24 and pulley 23 are removed.

(Effect of the invention) ■ The central post (inner scaffold frame)
It is supported by anchor hardware attached to the concrete below. Therefore, the vertical load of the central post, etc. is not applied to the unhardened or young concrete wall, but is supported by the wall that has already hardened and has sufficient strength, resulting in high construction safety.

■ For the same reason, the central post (inner scaffolding frame) can be raised and lowered regardless of concrete strength, which shortens the work process.

■ A series of formwork operations are performed on a dedicated work floor, making it easy and quick, and highly safe.

■ By raising the central post (inner scaffolding frame), the inner formwork can be raised simultaneously on all four sides, making the raising work easier and faster.

■ The center post (inner scaffold frame) is equipped with an inner scaffold for reinforcing steel work, so reinforcing work can be done easily and safely.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an outline of an embodiment of the first construction method according to the present invention, FIGS. 2 to 7 are longitudinal sectional views showing the construction procedure, and FIGS. 8 and 9. 10 is a vertical cross-sectional view showing an outline of an embodiment of the second construction method according to the present invention.
The figure and FIG. 11 are vertical sectional views showing an outline of an embodiment of the fifth construction method according to the present invention. 1.Hollow concrete wall, 2.21.Anchor hardware, 3.Guide beam, 4.Hanging beam, 5.5'.Guide roller, 66+,.Steel bar, 7.Central post. ,7
a-Middle pedestal, 7b-φ inner scaffold, 8-way and hydraulic jack,
9. Work floor, 10. Set screw, 11. Set screw, 1
2.Formwork, 13.Auto frame, 14.Workbench, 15.
Chain block, 16・Fist screw telescopic roller, 17
・19--Inner scaffolding frame, 17ai7b・19a・
191)...Working floor, 18...Formwork lifting device, 20...
Outside scaffolding frame, 21・Strong steel frame, 22-25
Parameter/Pulley, 24/See Wire Rope〇No. 2 Figure 4 Figure 3 Figure 5/7 Figure 6 Figure 7 Figure 9 Figure 40 i-;+

Claims (1)

[Claims] (Li) A guide beam and a suspension beam are installed at a predetermined interval inside a hollow concrete wall, and a central post positioned at the center of the guide beam and suspension beam that can be raised and lowered is used to attach the suspension material. Support it with a hanging beam through it and fix it at a predetermined height position, set a formwork at the top of the center post and pour concrete, and after removing the mold, raise the hanging beam to a predetermined height and fix it, A method for constructing a hollow concrete IJ-t structure characterized by raising the central post, repeating concrete pouring every 10 posts, and sequentially constructing an upper hollow concrete wall. (2) Hollow concrete IJ-G is suspended and supported by hanging materials using multiple anchor hardware attached to the inside of the wall as support points.
A liftable inner scaffolding frame equipped with two upper and lower working floors and a formwork lifting device is fixed in a predetermined position, the formwork is set using the formwork lifting device, concrete is poured, and after demolding, Taking a reaction force to the hanging material hanging from the anchor hardware attached to the 10 anchor hardware that suspends and supports the inner scaffold frame, and raising the inner scaffold frame by 10 points;
A method for constructing a hollow concrete structure characterized by repeating concrete pouring every 10 holes and sequentially constructing an upper hollow concrete wall. (3) Inside the hollow concrete wall, install a work floor that is suspended and supported by hanging materials using anchor hardware as support points, and an inner scaffolding frame that can be raised and lowered with a formwork lifting device, and on the outside that can be raised and lowered as well. Install an outer scaffolding frame, fix both of the scaffolding frames in a predetermined position, set the formwork with a formwork lifting device, pour concrete, and after demolding, protrude above the hollow concrete wall. Pulleys are attached to the upper and lower positions of the steel frame, the inner scaffold frame and outer scaffold frame are connected through wire ropes, and the inner scaffold frame is raised by raising the outer scaffold frame, and concrete is poured every 10 points. A method for constructing a hollow concrete structure characterized by repeatedly and sequentially constructing an upper hollow concrete wall.