JP2631871B2 - Concrete press-in method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a means for preventing a backflow of concrete in a concrete press-fitting method in which a predetermined amount of concrete is press-fitted into a closed space such as a formwork or a steel pipe column and solidified. It is about.

2. Description of the Related Art In a conventional concrete press-fitting method in which a predetermined amount of concrete is press-fitted into a closed space such as a formwork, a steel pipe column, or the like, as shown in FIGS. An opening 2 is provided in 1 or the like, and one end 3b of a press-in fitting 3 provided with a backflow preventing device such as an on-off valve 3a is fitted into the opening 2 and its flange 3c is fixed to a formwork, a steel pipe column 1 and the like. A flange 4a of a concrete supply pipe 4 is detachably connected to a flange 3e of the other end 3d of the pressure inlet fitting 3 via a pipe joint 5 or the like, and the other end of the supply pipe 4 is connected to a concrete pump having a concrete pump or the like. In communication with the source. When press-fitting concrete into a closed space 1a such as a formwork, a steel pipe column 1, etc., a backflow prevention tool such as an opening / closing valve 3a of the press-in fitting 3 is moved to open a press-in port 3f of the press-in fitting 3; Closed space such as formwork, steel pipe column 1 etc. through supply pipe 4 etc. from the supply source of concrete
When a predetermined amount of concrete is press-fitted into 1a, the press-fitting of the concrete is stopped, the backflow prevention tool such as the on-off valve 3a is moved to close the press-in port 3f of the press-in metal fitting 3, and the concrete press-fitted into the closed space 1a. So that it does not flow backward. Thereafter, the pipe joint 5 and the like are detached, and the supply pipe 4 is detached from the pressure inlet fitting 3. Next, a supply pipe 4 removed from the press-in fitting 3 is detachably attached to a press-fitting hardware such as a formwork or a steel pipe column 1 into which concrete is to be press-fitted through a pipe joint or the like. The press-in metal fitting 3 from which the supply pipe 4 has been removed is in a state where the concrete which has been pressed into the corresponding closed space 1a is solidified and the mold is removed in the case of a mold, or in the case of a steel pipe column. Then, the press-in metal fitting 3 is cut off from the solidified concrete or steel pipe column by fusing or the like, and the solidified concrete or steel pipe column is flushed.

Problems to be Solved by the Invention In the conventional concrete press-fitting method, the on-off valve 3a
If the backflow prevention tool breaks down, the concrete that has been pressed into the closed space 1a may flow back to the construction site due to backflow, so before removing the supply pipe 4 from the pressure inlet fitting 3, open / close valve 3a, etc. There is a drawback that it is necessary to visually check whether or not the backflow preventer completely stops the backflow of concrete. Further, after the solidified cocrete filled in the closed space 1a, the press-in fitting 3 is separated from the solidified concrete or formwork, steel pipe column or the like by fusing or the like, and the separated press-in fitting 3 is solidified therein. Concrete is filled and it takes a lot of work to remove it, and it has to be disposable. However, the pressure inlet fitting 3 has a complicated structure of a backflow preventing device such as the on-off valve 3a and is expensive. Therefore, there is a drawback that the conventional technique of disposing the pressure inlet fitting 3 is very uneconomical.

The problem to be solved by the present invention is to provide a concrete press-in method without the above-mentioned drawbacks, in other words, to provide a concrete press-in method using an easy and inexpensive concrete backflow prevention means. .

Means for Solving the Problems The structure of the present invention provides a concrete press-fitting method in which a predetermined amount of concrete is press-fitted into a closed space such as a formwork, a steel pipe column and the like, and an opening is provided in the formwork, the steel pipe column and the like. A press-fit pipe having a press-fitting port communicating with the closed space is fixed to a portion of the formwork, steel pipe column, or the like having the opening, and an end portion of the press-fit pipe in the closed space is deformed by the pressure of concrete. A cylindrical check tube is connected, a supply pipe is detachably connected to an end of the press-fit pipe outside the closed space, the supply pipe is communicated with a concrete supply source, and the supply pipe, the press-fit pipe and the like are connected. After a certain amount of concrete is pressed into the closed space, the concrete inside the supply pipe, press-fit pipe, etc., flows back, and the check cylinder is deformed by the pressure of concrete acting around the check cylinder, and the deformed check The end of the press-fit tube by the tube There is a concrete press-in method in which the supply pipe is removed from the press-fit pipe after closing the pressure inlet of the minute.

Even if the press-fitting pipe used in the present invention is constituted by a straight pipe,
The first pipe portion and the second pipe portion may be constituted by an L-shaped pipe in which the first pipe portion and the second pipe portion are connected at a substantially right angle. And the like, using bolts, nuts, welding or other fixing means.

In addition, a tubular check cylinder that is deformed by the pressure of concrete is connected to an end portion of the press-fitting pipe that is located in a closed space such as a formwork, a steel pipe column, or the like. When press-fitting concrete into a closed space through a press-fit pipe, the check cylinder is opened in a cylindrical shape in cross section by the pressure of concrete acting on the inside of the check cylinder, and the concrete in the closed space is released. When flowing back into the press-fit pipe through the check cylinder, the pressure of the concrete pressed into the closed space acts on the outside of the check cylinder to deform the check cylinder, and the deformed check cylinder causes the press-fit pipe to be deformed. The pressure inlet of the end portion is configured to be closed.

As a material forming the check cylinder, for example, a flexible polymer material (for example, soft vinyl chloride resin) is used. The length of the deformable portion of the check cylinder is at least about twice as large as the diameter of the press-fit pipe at the end portion.

The blockage detection sensor is removably attached to a part of the press-fitting pipe frame, steel pipe column, or the like located outside the closed space or a partial pipe of the supply pipe connected to the press-fitting pipe. As the blockage detection sensor, for example, a pressure detection sensor capable of detecting the pressure inside a check tube or the like can be used.

Effect of the Invention The present invention is based on the invention that after a predetermined amount of concrete is press-fitted into a closed space such as a formwork or a steel pipe column through a supply pipe, a press-fitting pipe, or the like, the concrete inside the supply pipe, the press-fitting pipe, etc., is back-flowed, and The pressure of the press-fitted concrete is applied to the outer periphery of the check cylinder to deform the check cylinder, and the deformed check cylinder closes the press-in port at the end of the press-fit pipe in the closed space,
Since the supply pipe can be removed from the press-fitting pipe after confirming the blockage of the press-in port, concrete injected into the closed space does not flow backward and flow out to the construction site.

Embodiment 1 In the first embodiment, the present invention is applied to a case where a predetermined amount of concrete is press-fitted into a steel pipe column and solidified.

First, an apparatus used in the first embodiment will be described with reference to FIG. Fix the lower end of the steel pipe column 11 to the foundation B,
11 is built on the foundation B to construct a structure. The steel pipe column 11 is provided with an opening 12 thereunder.
The flange 13b of the press-fit tube 13 having 13a is fixed by welding or the like.

As shown in FIG. 1, a steel pipe column 11 closed space 11a of the press-fit pipe 13 is provided.
A flange 13c is provided at the outer end of the
A flexible check tube 14 is fixed to the inner end portion 13d of 1a. The check cylinder 14 is formed of a thin polymer body made of a flexible polymer material, for example, a soft vinyl chloride resin,
A projection 14a is provided on the inner periphery of the end on the side to be attached to the press-fit tube 13. A circumferential groove 13e is formed on the outer periphery of the end portion 13d of the press-fit tube 13, and the check cylinder 14 is fitted to the outside of the end portion 13d, and the ridge 1
4a is fitted into the groove 13e, and a stopper ring 15 is fitted outside the portion of the check cylinder 14 having the ridge 14a, and the check cylinder 14 is fixed to the press-fit tube 13.

A through-hole 13g is formed in a portion 13f outside the closed space 11a of the press-fitting pipe 13, and a male thread of a case 16a of a pressure detection sensor 16 constituting a blockage detection sensor is screwed into a female thread of the through-hole 13g. Then, the pressure detection sensor 16 is detachably fixed to the press-fitting pipe 13. The pressure detection sensor 16 and the display of the detection signal are connected by an electric wire 16b.

Flange 13c of press-fit pipe 13 and flange 17a of supply pipe 17
The supply pipe 17 is connected to a concrete supply source equipped with a concrete pump or the like via a pipe joint 18 so as to be detachable.

If the diameter of the opening 12 is made larger than the diameter of the retaining ring 15, the press-fitting pipe 13 to which the check cylinder 14 is attached is closed from the outside of the steel pipe post 11 through the opening 12.
The press-fit tube 13 can be easily fixed.

Next, the concrete press-in method of the first embodiment will be described with reference to FIGS.

Concrete is supplied from its source to supply pipe 17, press-fit pipe
It is press-fitted into the closed space 11a of the steel pipe column 11 through the 13 and the check cylinder 14. As shown in FIG. 2, the check cylinder 14 is formed into a cylindrical shape by the pressure of the concrete acting on the inner peripheral surface thereof, so that the concrete can be smoothly pressed.

As shown in FIG. 3, after a predetermined amount of concrete is pressed into the closed space 11a, a concrete pump or the like as a supply source of the concrete is reversed, and the concrete which has been pumped through the supply pipe 17 or the like is reversed. Then, the concrete in the supply pipe 17 is caused to flow backward, thereby causing the concrete in the press-fitting pipe 13 to flow backward. In order to make the concrete flow backward, the concrete pump or the like may be stopped to release the pumping pressure in the supply pipe 17, and the concrete may be pulled slightly.

When the concrete in the press-fitting pipe 13 flows backward, the concrete in the closed space 11a tries to flow back into the press-fitting pipe 13 through the check cylinder 14. When the concrete in the check cylinder 14 flows backward, the pressure of the concrete acts on the outer periphery of the check cylinder 14,
The check tube 14 configured to deform under the pressure of concrete deforms as shown in FIG. 3, and the press-in port 13a of the end portion 13d of the press-fit pipe 13 is closed by the deformed check tube 14. .

In this closed state, the pressure due to the weight of the concrete press-fitted into the closed space 1a always acts on the outer periphery of the check cylinder 14, so that the press-in port 13a is kept closed.

It is necessary that the check cylinder 13 has such a rigidity that the check cylinder 13 is deformed by the pressure of its own weight of the concrete and the check cylinder 14 itself does not enter the press-fitting pipe 13.

The pressure inlet 13a at the end of the press-fitting pipe 13 due to the deformation of the check cylinder 14
Can be detected by the blockage detection sensor. That is, when the press-in port 13a is closed, the pressure in the press-fit pipe 13 detected by the pressure detection sensor 15 constituting the blockage detection sensor decreases, so that the blockage of the press-fit pipe 13 can be confirmed by the detection signal. .

As shown in FIG. 4, after confirming that the press-fitting pipe 13 is closed, the pipe joint 18 is removed and the supply pipe 17 is removed from the press-fitting pipe 13. Next, a supply pipe 17 detached from the press-fit pipe 13 is detachably attached to a press-fit pipe attached to a formwork, a steel pipe column or the like for press-fitting concrete through a pipe joint or the like.

The press-fit pipe 13 from which the supply pipe 17 has been removed is a closed space of the steel pipe column 11.
After the concrete pressed into 11a has solidified,
It is cut off by fusing at the part close to the surface of 1.

The pressure detection sensor 16 attached to the press-fitting pipe 3 is used before or after the press-fitting pipe 13 is separated from the steel pipe column 11.
The male screw part of 16a is removed from the female screw part of the through-hole 13g and reused.

In the second embodiment, shown in FIG. 5, the present invention is applied to a case where a predetermined amount of concrete is pressed into a steel pipe column and solidified by using an L-shaped press-fit pipe.

As shown in FIG. 5, the press-fit pipe 23 has a first pipe portion 23b.
And an L-shaped tube in which the second tube portion 23c and the second tube portion 23c are connected at substantially right angles.

A circumferential groove 23g is formed on the outer peripheral surface of the end portion 23f of the first tube portion 23b of the press-fit tube 23, and the check cylinder 24 having no ridge at the inner end is fitted to the outside of the end portion 23f. And fit the retaining ring 25 outside the portion of the check cylinder 24 outside the groove 23g, and attach the retaining ring 25 to the groove 23g.
g, and the check tube 24 is fixed to the press-fit tube 23.

The flange 23d of the press-fit pipe 23 is fixed to the steel pipe post 21 so that the longitudinal direction of the closed space 21a of the steel pipe post coincides with the direction of the first pipe portion 23b of the L-shaped press-fit pipe 23.

In the second embodiment, since the direction of the first tube portion 23b of the L-shaped press-fit tube 23 coincides with the longitudinal direction of the closed space 21a, the L-shaped press-fit tube 23 is attached to the end portion 23f of the first tube portion 23b. Since an excessive force for bending the check cylinder 14 does not act on the check cylinder 14, the concrete can be smoothly pressed into the long vertical closed space 21a.

How to attach the pressure detection sensor 16, the supply pipe 17 and the like to the press-fitting pipe 23 is the same as that of the first embodiment, and the description is omitted.

The third embodiment is shown in FIG. 6, to which the present invention is applied when a predetermined amount of concrete is pressed into a form and solidified.

Formwork 31 is formed by surrounding the periphery of steel frames, reinforcing bars, and the like built on the foundation B with a frame. The formwork 31 has an opening 32 below it, a press-fit pipe 33 having a press-in port 33a is inserted into the opening 32, and a fixing tool such as a bolt nut 30 or the like is used to fix the middle flange 33b of the press-fit pipe 33 to the formwork 31. And detachably fixed to A flange 33d is formed by screwing a female screw in the center hole of the ring into a male screw portion on the outer periphery of the end 33c of the press-fit tube 33. The other methods of mounting the pressure detection sensor 36, the supply pipe 37, and the like are the same as those in the first embodiment, and the method of mounting the check cylinder 34 to the press-fitting pipe 33 is the same as in the second embodiment. Is omitted.

In the third embodiment, after the concrete pressed into the closed space 31a in the formwork 31 is solidified, the flange 33d and the pressure detection sensor 36 are removed from the press-fitting pipe 33, and the bolt nut
Remove the fixtures such as 30 and insert the formwork 31 into the flange 33b of the press-fit tube 33
After removing from the press-fit pipe 33, remove the solidified concrete around the press-fit pipe 33 and remove the press-fit pipe 33.
May be separated by fusing or the like at a portion close to the surface of the solidified concrete. First, press-fit the pipe 33
31 is cut off by fusing or the like on the outer surface, the bolts and nuts 30 and other fixtures are removed, the formwork 31 is removed from the concrete solidified in the formwork 31 and the uncut press-fitting pipe 33, and the uncut press-fitting pipe 33 is removed. The portion close to the surface of the solidified concrete may be cut by fusing or the like.

In the first and third embodiments, the portions of the press-fit pipes 13, 33 located in the closed spaces 11a, 31a are made as short as possible. When this portion is shorter, the non-return cylinders 14 and 34 are less likely to be bent due to the output of the concrete, so that the flow of the concrete is smoother and the material is saved. In the third embodiment, when a portion of the solidified concrete around the press-fitting pipe 33 is scraped off and the press-fitting pipe 33 is removed, if the portion is short, the removing operation becomes easy.

Effect of the Invention The present invention, after press-fitting a predetermined amount of concrete into a closed space such as a steel pipe column through a supply pipe, a press-fitting pipe, and the like, the concrete inside the supply pipe, the press-fitting pipe, and the like is reverse-flowed.
The pressure of the concrete pressed into the closed space acts on the outer circumference of the check cylinder, the check cylinder is deformed, and the press-in port at the end of the press-fit pipe in the closed space is closed by the deformed check cylinder. Since the supply pipe can be removed from the press-fitting pipe after confirming the blockage of the press-in port, there is no danger that concrete injected into the closed space flows backward and flows out to the construction site.

Parts located outside the closed space, such as press-fit pipe forms, steel pipe columns,
If a blockage detection sensor is installed at the part of the supply pipe on the press-fitting pipe side, the blockage detection sensor confirms that the press-fitting pipe is blocked, and then removes the supply pipe from the press-fitting pipe, the concrete injected into the closed space flows backward. Accidents flowing out to the construction site can be completely prevented.

In addition, a simple structure in which a check tube made of a flexible polymer material is attached to a portion located in the closed space of the press-fitting pipe can prevent the backflow of concrete, so that the backflow prevention means is provided at low cost. be able to. The operation of the backflow prevention is very simple because it is sufficient to simply backflow the concrete inside the supply pipe, the press-fitting pipe and the like.

Further, since the blockage detection sensor is detachably attached to the press-fitting pipe, the blockage detection sensor can be removed from the disposable press-fitting pipe and reused, which is very economical.

[Brief description of the drawings]

1 to 4 show a first embodiment of a concrete press-fitting method according to the present invention, and FIG.
FIG. 2 is a longitudinal sectional view showing a state in which a check cylinder, a supply pipe and the like are attached, FIG. 2 is a longitudinal sectional view showing a state during press-fitting of concrete shown in FIG. 1, and FIG. 3 is a concrete section shown in FIG. FIG. 4 is a longitudinal sectional view showing a state after the backflow of water, and FIG. 4 is a longitudinal sectional view showing a state in which a supply pipe is removed from the press-fitting pipe after closing the press-fitting inlet of the press-fitting pipe with a check cylinder. Is a longitudinal sectional view showing a state in which a press-fitting pipe, a check cylinder, a supply pipe and the like are attached to the steel pipe column of the second embodiment, and FIG. 6 is a press-fitting pipe in the formwork of the third embodiment.
FIG. 7 and FIG. 8 show a state in which a check cylinder, a supply pipe, etc. are mounted, and FIG. 7 and FIG. It is a longitudinal section showing two different states of a device. In the figure, 1 is a formwork, a steel pipe column, etc., 3 is a metal fitting for press-in, 4, 17,
27 and 37 are supply pipes, 5, 18, 28 and 38 are pipe joints, 11 and 21 are steel pipe columns, 13, 23 and 33 are press-fit pipes, 14, 24 and 34 are check cylinders, 16, 26 and 36 are pipes The pressure detection sensor 31 is a mold.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kenro Mitsui 2-5-114 Minamisuna, Koto-ku, Tokyo Inside the Technical Research Center, Takenaka Corporation (56) References Jikai Sho 61-157652 (JP, U)

Claims (7)

(57) [Claims] In a concrete press-in method for press-fitting and solidifying a predetermined amount of concrete into a closed space such as a formwork or a steel tube column, an opening is provided in the formwork, the steel tube column or the like, and the formwork having the opening is provided. A press-fit pipe having a press-in port communicating with the closed space is fixed to a portion such as a steel pipe column, and a tubular check tube deformed by concrete pressure is connected to an end portion of the press-fit pipe in the closed space. A supply pipe is detachably connected to an end of the press-fitting pipe outside the closed space, the supply pipe is connected to a concrete supply source, and a predetermined amount of concrete is introduced into the closed space through a supply pipe, a press-fitting pipe, or the like. After press-fitting, the concrete inside the supply pipe, press-fitting pipe, etc. is back-flowed, and the check cylinder is deformed by the pressure of concrete acting around the check cylinder,
A press-fitting method for concrete, characterized in that a press-in port at the end portion of the press-fit pipe is closed by a deformed check cylinder, and then a supply pipe is removed from the press-fit pipe. 2. A concrete press-fitting method in which a predetermined amount of concrete is press-fitted into a closed space such as a formwork, a steel pipe column, etc., and an opening is provided in the formwork, the steel pipe column, etc. A press-fit pipe having a press-in port communicating with the closed space is fixed to a portion such as a steel pipe column, and a tubular check tube deformed by concrete pressure is connected to an end portion of the press-fit pipe in the closed space. A supply pipe is detachably connected to an end of the press-fitting pipe outside the closed space, and the supply pipe is connected to a concrete supply source. A blockage detection sensor is attached to the part, and after a predetermined amount of concrete is pressed into the closed space through the supply pipe, the press-fitting pipe, etc., the concrete inside the supply pipe, the press-fitting pipe, etc., is caused to flow backward and around the check cylinder. To the pressure of concrete acting on The check cylinder is deformed, and the deformed check cylinder closes the press-in port at the end portion of the press-fitting pipe, and the blockage of the press-in port is confirmed by a detection signal of a blockage detection sensor. A concrete press-fitting method characterized by removing 3. A press-fit pipe is formed by an L-shaped pipe in which a first pipe portion and a second pipe portion are connected at substantially right angles, and the longitudinal direction of a closed space such as a formwork, a steel pipe column and the like of the press-fit pipe. 3. The method of press-fitting concrete according to claim 1, wherein the direction of the first pipe portion of the L-shaped pipe is matched. 4. A method of connecting a concrete check tube which is deformed by the pressure of concrete to an end portion of a press-fitting pipe which is to be located in a closed space and press-fits concrete into the closed space through the press-fitting pipe. The pressure acts on the inside of the check cylinder to open the check cylinder opening, and when the concrete in the closed space attempts to flow back out of the closed space through the press-fit pipe, the pressure acts on the outside of the check cylinder. The press-fitting pipe provided with the check-in pipe, wherein the press-in pipe at the end portion of the press-fitting pipe is closed by the deformed check-in pipe. 5. The press-fit tube according to claim 4, wherein the press-fitting tube is formed by an L-shaped tube in which the first tube portion and the second tube portion are connected at substantially right angles. Press-fit pipe. 6. A press-fit with a check cylinder according to claim 4, wherein the check cylinder which is deformed by the pressure of concrete is made of a flexible synthetic polymer material. tube. 7. The check cylinder according to claim 4, wherein a blockage detection sensor is detachably attached to a portion of the press-fitting pipe which is located outside the closed space. Press-fit pipe provided.