JPH0258427B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concrete splicing method used in the construction of concrete structures.

Normally, in concrete work such as RC or SRC structures, joints occur on horizontal or vertical surfaces, but joints often become defects in the design and structure of buildings, similar to cracks. In particular, water leakage accidents are likely to occur in vertical joints of underground external walls, and the construction is complicated and requires a great deal of labor.

BACKGROUND ART Conventionally, various methods have been devised to vertically join the outer walls of structures, including loose board joints and lath joints.

Figure 1 shows the conventional method of splicing separate plates.The construction process using this method is: installing the splice formwork, pouring concrete, dismantling the splice formwork, cleaning the splice area, and restoring reinforcing steel. The order will be rework, followed by formwork restoration work.

Note that in the figure, a is a loose board as a formwork for the joint surface, and b
is a weir plate for forming the RC wall surface, c is a form tie, d is a habata pipe, and e is a square tightening chain that tightens the habata pipe. In addition, a vinyl chloride water stop plate f (bending type) is installed in advance at the joint using a mounting bracket g.
It is designed to be triggered after the formwork is dismantled.

However, although this method can achieve relatively good results compared to conventional construction methods in terms of construction accuracy and material cost, it requires a considerable amount of effort in the series of operations mentioned above and has poor workability. In the end, there are potential costs involved.

In addition, the lath joint method, which uses lath for the joint surface, has good workability, but it has advantages and disadvantages, such as water leakage due to gas rust, and is inferior in construction accuracy and cost, and neither method is necessarily satisfactory.

Therefore, it is an object of the present invention to provide a concrete splicing method that has excellent workability and economical efficiency while ensuring sufficient water-stopping properties particularly at the spliced joints.

Hereinafter, the construction method of the present invention will be explained based on illustrated embodiments.

FIGS. 2 and 3 show a joint section in this concrete joint method, in which air hoses 1 are lined up at the joint surface, and air is press-fitted into them to be used as a formwork. In the example shown in the figure, a total of four air hoses are attached, two large-diameter air hoses 1a in the center and two small-diameter air hoses 1b on both sides. Depending on the situation, it is sufficient to prepare the necessary number of diameters as appropriate. Further, a water stop plate 3 is inserted between the central air hoses 1a, 1a. If air is forced in in this state, the entire or almost the entire joint surface can be closed with the reinforcing bars 2, the water stop plate 3, etc. sandwiched therebetween.

FIG. 4 shows a specific example of the air hose 1, in which the upper and lower ends of the hose are attached to short cylindrical end hardware 9 with a U-shaped cross section by hose bands 11. Further, a valve 10 is attached to the upper end metal fitting 9,
Air is forced in from here.

Although the illustrated embodiment shows an example of application to a vertical wall, it can also be used for slab jointing by arranging the air hoses horizontally.

Furthermore, concrete pressure during concrete pouring is dealt with by pressing the air hose 1 with a receiving separator 8. In this case, the receiving separator 8 may be tensioned with form ties if necessary.

Next, the construction procedure will be explained.

First, the air hose 1 is attached and air is pressurized into the air hose 1. In the figure, 5 is a flap pipe, 6 is a separator, and 7 is a form tie. When concrete is poured and reaches a predetermined strength, the valve 10 of the air hose 1 is opened to evacuate the air. After disassembling the air hose 1, clean and tidy up the spliced part. Finally, the formwork is restored and reworked to complete the joint work. Note that at this time, the reinforcing bars 2 can be worked on as they are, so there is no need to repair the reinforcing bars 2.

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

(1) By lining up air hoses filled with air and using them as formwork for the joint surface, leakage of concrete will be eliminated and the joint surface will be clean. In particular, since the water stop plate is held between the air hoses, it is easy to install and can be stored in a predetermined position, resulting in a clean joining surface and high water stop performance.

(2) Short cylindrical end fittings with a U-shaped cross section are attached to the top and bottom ends of the air hose, so the air hose has an even cylindrical shape from top to bottom, and air can be quickly injected. The required air hose can be easily obtained by preparing a hose of the required length corresponding to the length of the joining surface and replacing and attaching it to the short cylindrical end fittings at the top and bottom ends. This ensures that the upper and lower ends of the joint surfaces fit together, resulting in excellent workability.

(3) Since the reinforcing bars are also held between the air hoses, continuous reinforcing bars can be placed at the joints, and there is no need to modify the reinforcing bars, which improves workability and reduces the cost of materials.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional example, FIG. 2 is a front view of a joint in the construction method of the present invention, FIG. 3 is a cross-sectional view thereof, and FIG. 4 is a longitudinal cross-sectional view of an air hose. 1, 1a, 1b...Air hose, 2...Reinforcing bar, 3...Water stop plate, 4...Shelter plate, 5...Fall pipe, 6...Separator, 7...Form tie, 8...Receiver separator , 9... End hardware, 1
0...Valve, 11...Hose band.

Claims (1)

[Scope of Claims] 1. An air hose, which is used as a formwork substitute and has short cylindrical end metal fittings with a U-shaped cross section attached to the upper and lower ends, is arranged at the concrete joint surface position and by pressurizing air into this air hose, reinforcing bars and stoppers are installed. A concrete jointing method characterized in that a joint surface is closed with a water plate sandwiched in between, the air hose is evacuated and the air hose is removed after concrete is poured, and concrete is jointed in an adjacent part. 2. The concrete jointing method according to claim 1, wherein the air hose is made of rubber.