JPH03287980A - Press-in pipe - Google Patents

Abstract

PURPOSE:To facilitate loading and unloading of a press-in pipe by providing an insertion regulating flag on the way of the direction of the axis of the press-in pipe and, at the same time, providing either end fastening sections of a clamping band wound around a steel pipe in a state to hold an expansion bag. CONSTITUTION:An insertion regulating flange 6 for an insertion opening of the lower part of a steel pipe 4 is provided on the way of the axis of a press-in pipe connected to the front end of a supply pipe 2 through a joint clamp 1. In addition, either end fastening sections of a clamping band 9 wound around a steel pipe 4 in a state to hold an expansion bag 8 expanded and contracted by a compressor 7 placed to the opposite side of the steel pipe 4. Narrow shaped hook stopping holes 10 are provided to both sides of the flange 6, and stopping hooks 11 are provided to both ends of the clamping band 9 to draw the press-in pipe 3 toward an opening of the steel pipe 4. According to the constitution, loading and unloading of the press-in pipe 3 can be made by one touch.

Description

Detailed Description of the Invention "Field of Industrial Application" This invention relates to a press-in pipe used in a concrete pouring method in which concrete is press-fitted from the bottom into a steel pipe column, and more specifically, a check valve for preventing backflow of press-in concrete is installed in a steel pipe. This invention relates to an improvement of a press-fit pipe in which the press-fit pipe is constructed independently of the press-fit pipe, and the press-fit pipe is removable after completion of concrete press-fitting.

"Conventional technology" Regarding the pouring method of pouring concrete into steel pipe columns,
Since concrete is poured from the slab height, the free fall height of the concrete increases, and it also collides with obstacles such as reinforcing bars during the fall, which tends to cause concrete aggregate separation, especially when the floor height is high. This kind of effect is likely to occur when reinforcing bars are arranged in a congested manner. In addition, the air entrained when concrete falls causes junk and large air bubbles to form in the poured concrete. Furthermore, in order to avoid the above-mentioned disadvantages, the tremie pipe in which the supply pipe line is extended to the pouring site becomes unusable depending on the arrangement of the reinforcing bars. All of the problems on the ridges are caused by trying to pour concrete from above.

Therefore, instead of pouring concrete from above, a construction method was developed in which concrete was pressed in from below.
This method has been proposed in Japanese Patent Publication No. 974, Japanese Patent Application Laid-Open No. 64-62555, etc.

By press-fitting concrete from the bottom in this way, it is possible to pour the concrete continuously without entraining air, and the concrete in the press-in area is pressurized by the pressure of the concrete pumping device and its own weight. Since the concrete is poured, the air that would otherwise be contained inside the concrete is pushed out to the top, so there is no cavity left in the middle of the concrete, and dense, strong, and durable concrete is poured. Since the concrete rises in an average mixed state with no aggregate separation, there are no obstacles such as reinforcing bars, and there is no change in quality inside the concrete due to differences in specific gravity, forming a concrete filled column with an average strength. I can do it.

In the concrete pouring method that presses in from the lower part of the ridge, a jig for joining the steel pipe is interposed at the tip of the supply pipe taken out from the concrete pumping device, and the jig etc. A check valve mechanism must be provided to prevent backflow of press-in concrete.

For example, in the method proposed in the above-mentioned publication, an injection inlet hardware equipped with an on-off valve is attached to the outside of a connecting hole drilled at the bottom of a steel pipe, and the tip of a concrete supply pipe is connected to this.

This injection port hardware is used after the filled concrete hardens.
The injection port hardware is separated from the steel pipe column by means such as cutting, and is filled with hardened concrete, which requires a great deal of effort to remove, so it has no choice but to be thrown away. However, this press inlet hardware is very uneconomical because the backflow prevention devices such as on-off valves have a complicated structure and are expensive. Therefore, in Japanese Patent Application No. 63-212845, the present applicant provided an opening in a steel pipe column, fixed a press-fit pipe equipped with a press-in port communicating with a closed space to the part of the steel pipe column where the opening was located, and A cylindrical check tube that is deformed by press-fitting concrete is connected to the end of the closed space, a supply pipe is removably connected to the end of the press-fit pipe outside the closed space, and the supply pipe is connected to the concrete. After press-fitting a predetermined amount of concrete into the closed space through the supply piping, press-fitting pipe, etc., the concrete inside the supply piping, press-fitting pipe, etc. flows backward, and acts around the check cylinder. It is proposed that the check cylinder is deformed by the pressure of the concrete, the press inlet at the end of the press-in pipe is blocked by the deformed check cylinder, and then the supply pipe is removed from the press-in pipe by fusing. . According to this method, the backflow of concrete can be prevented with a simple configuration of attaching a check tube made of flexible polymer material to the part of the press-in pipe located in the closed space, so backflow prevention means can be used. It can be provided at low cost. The operation of backflow prevention is very simple because it is sufficient to simply cause the concrete inside the supply piping, press-in pipe, etc. to flow back.

However, in this case, the press-fit pipe that remains as a protrusion on the surface of the concrete press-in machine steel pipe still has to be removed by fusing, and this work involving many points is extremely troublesome as mentioned above. The same difficulties have not been resolved, and it is a waste that the jig cannot be repurposed as a matter of course.
Furthermore, there is the inconvenience that removal is restricted until the concrete hardens. Therefore, the applicant filed the patent application No. 1-2811.
In No. 46, a tap is cut into the opening that passes through the lower part of the steel pipe, and a threaded shape is threaded into the tap cut to fit into the press-fit pipe attached via a swivel joint to the tip of the supply piping. The supply piping is screwed onto the steel pipe, and a check valve mechanism is installed inside the steel pipe at the opening, which is separate from the press-in pipe, and a predetermined amount of concrete is press-fitted into the closed space of the steel pipe. After that, the check valve is closed when the press-fit is stopped, and then the press-fit pipe is unscrewed without allowing the concrete to solidify.We propose a method that makes it possible to easily attach and detach the press-fit pipe and reuse it. did.

``Problem to be solved by the invention'' However, in the proposal of Ugegami, the attachment and detachment of the press-fit pipe is based on a screw movement, so it is not possible to do it with one touch, and in a crowded field It is possible that sand and gravel get stuck in the grooves, making attachment and detachment difficult.

The present invention is a press-fitting method in which a check valve that prevents the backflow of press-fit concrete that can be attached and detached with a single touch is configured in a steel pipe independently of the press-fit pipe, and the press-fit pipe can be removed after the concrete press-fit is completed. The purpose is to provide pipes.

"Means for Solving the Problems" In order to achieve the above object, in the press-fit pipe of the present invention, a flange is provided at the lower part of the steel pipe in the middle of the pipe axis direction to restrict insertion into the opening for insertion of the perforation, and A tightening band is provided at both ends to wrap around the steel pipe so as to enclose an inflatable bag placed on the side, and is connected to the tip of the supply pipe via a joint clamp or the like. The tightening band may be fastened by providing a hook locking hole in the 7-lunge and by providing locking hooks at both ends of the tightening band. Alternatively, the tightening band may be fastened by providing hook locking metal fittings at the rear position of the seven flange of the tube wall and by attaching locking hooks to both ends of the tightening band.

"Operation" The press-fit pipe inserted into the insertion opening is pressed into contact with the opening against the pressure of the poured concrete via the tightening band tightly wrapped around the steel pipe by the engraving of the expansion bag. This pressure contact is released by deflation of the inflatable bag, and the press-fit tube can be pulled out.

Attaching and detaching the ridge is done by inserting and removing the insertion tube from the loose fitting hole, which is a one-touch operation.

“Example” To explain the example with reference to the drawings, in FIGS. 1 to 3, the press-fit pipe 3 connected to the tip of the supply pipe 2 via the joint clamp 1 etc. has its pipe axis. A flange 6 for restricting insertion into the insertion opening 5 of the perforation is provided at the lower part of the steel pipe 4 midway. Further, at a predetermined portion of the press-fit pipe 3, a compressor is wrapped around the steel pipe 4 to enclose an inflatable bag 8 that is engraved and contracted by a compressor 7 or the like disposed on the opposite side of the steel pipe 4, as shown in FIGS. Correct attachment portions are provided at both ends of the attached band 9. In other words, in Figure 2, 7
Elongated hook locking holes 10, 10 are provided on both sides of the lunge 6, and correspondingly wide locking hooks 11, 11 are provided at both ends of the band 9.

Therefore, the press-fit tube 3 is drawn toward the opening 5 via the flange 6.

On the other hand, in FIG. 3, a hook locking metal fitting 12.12 is welded to the rear position of the flange 6, and correspondingly locking hooks 13.13 are attached to both ends of the band 9.

Therefore, the press-fit tube 3 is drawn toward the opening 5 using the rear of the flange 6 as a fulcrum.

The press-fit tube 3 is removed by deflating the expansion bag 8 and releasing the band 9.

Hereinafter, embodiments of check valve configurations in various steel pipes will be described.

In FIGS. 4a and 4b, a rising supply pipe 16 is welded to the closed space 14 side of the opening 5, and a flexible or door-operated check valve 15 (the illustrated example is a door-operated type) is attached to the end opening. There is.

Thus, the press-fit concrete 17 is poured while being oriented in the vertical direction of the closed space 14 while expanding the valve 15, and when the press-fit stops, the valve 15 is closed.

Concreting is done by the closing action of valve 15! Since there is no risk of leakage of J-) 17, when the press-fit pipe 3 is removed, concrete can be placed without any protrusions remaining on the outer surface of the steel pipe 4.

Incidentally, the cavity of the rising supply pipe 16 may be filled with hard mortar as a post-process.

In FIGS. 5a and 5b, the above-mentioned rising supply pipe 16 is omitted, and the valve 15 is attached directly to the opening 5. In this case, the concrete is poured via the rising supply pipe 16!
J-) Although the vertical orientation of 17 cannot be enjoyed, post-processing of the hard mortar filling process is not required. Figure 6 a and b are the 51st! This figure shows an embodiment corresponding to la and b, in which the valve 15 is flexible. In this case, the valve material used is a thin iron plate (0.5'''8 or less), vinyl chloride, soft plastic, etc. The invention shown in FIGS. 5), a direction change plate 1B is attached to the opening 5 in place of the rising supply pipe 16. In this case, the rising supply pipe 16 is provided with a similar vertical orientation effect. However, the hard mortar filling process required for the rising supply pipe 16 is not required.

Figures 8a and 8d show that the press-fit tube 3 is used to ensure that the steel tube 4 enters the closed space 14 in a specified manner and is applied to the case of Figure 6 or 7.

Since the valve 15 is expanded by the predetermined intrusion into the ridge without being affected by concrete pressure, the energy required to press in the concrete 17 is reduced. The press-in pipe 3 is pulled out while the press-in of concrete is stopped, but at this time, the valve 15, which has been prevented from closing by the press-in pipe 3, is closed.

"Effects of the Invention" Since the present invention is configured as described above, it produces the effects described below.

(1) The press-fit tube can be attached and detached with just one touch, making it simple and quick.

(2) It is advantageous because all the jigs can be reused and repurposed without being thrown away.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an explanatory diagram of the method of connecting the press-fit pipe to the steel pipe of the present invention, Figs. 2 and 3 are explanatory diagrams of the fastening side of the tightening band of the present invention, Fig. 4a, b is a detailed longitudinal sectional view of the present invention; a is a detailed illustration of the line portion in figure a; Figs. 5a and b are detailed longitudinal sectional views of the present invention; a,
b, Figures 6a and b are detailed longitudinal sectional views of the present invention, and Figure 8F! 1Ja-d is an explanatory diagram of the procedure of the implementation procedure of the present invention. 1... Joint clamp, 2... Supply piping,
3... Press-fit pipe, 4... Steel pipe, 5... Opening for insertion, 6... 7 lunge, 7... Compressor, 8... Expansion bag, 9-... Tightening band, 10
...Hook locking hole, 11...Hook for locking, 12
...Hook locking metal fitting, 13...Hook for locking,
14...Closed space, 15...Check valve, 16...
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Claims (3)

[Claims] (1) A flange is provided midway in the axial direction of the steel pipe to restrict insertion into the hole for insertion into the lower part of the steel pipe, and a tightening band that wraps around the steel pipe in a manner that embraces an expansion bag placed on the opposite side of the steel pipe is fastened at both ends. A press-fit pipe that is connected to the tip of the supply pipe via a joint clamp, etc. (2) The press-fit pipe according to claim 1, wherein the tightening band is fastened by providing hook locking holes in the flange and locking hooks at both ends of the tightening band. (3) The press-fit pipe according to claim 1, wherein the tightening band is fixed by providing a hook locking fitting at a position behind the flange of the pipe wall and by attaching locking hooks to both ends of the tightening band. .