JP2581209B2 - Concrete casting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a concrete placing method for press-fitting concrete from the side of a formwork.

[Prior art] In a structure such as a nuclear facility, a high-rise house, an underground structure, a warehouse, etc., a normal construction order is used for the purpose of carrying equipment and the like and performing construction from the first floor to the basement in accordance with excavation. May be cast concrete against For example, after the upper floor is constructed first, pillars and walls on the lower floor are constructed. There are the following methods for such construction.

B. Attach a funnel-shaped formwork to the top of the formwork, raise concrete pipes from the floor to this point, and drop concrete into the formwork.

(B) Drill through holes in floor slabs and beams, and drop concrete into the formwork from the upper floor through this.

Also, after the concrete has been poured and the concrete has hardened sufficiently, the mold is removed, the concrete such as the above-mentioned funnel-shaped part is removed, and the ground surface is smoothed and the through holes are made of concrete. Close up. Furthermore, near the top end, settlement occurs due to separation of concrete and air trapping, and a gap is generated. Therefore, when the floor height is large, the top end may be filled with grout.

[Problems to be solved by the present invention]

When the concrete is reversely laid as described above, the following problems are present, particularly when there are many rebars, when steel is included, and when the floor height is large, the tendency is particularly remarkable.

(A) In terms of quality, gaps are likely to form at the top end, and grout mortar is often used. Also, since it was cast from above, it was easy to separate and the finish was poor. In addition, the vibrator was difficult to use due to the enclosed space, resulting in junka.

(B) During installation, installation and removal of funnel-shaped formwork, installation and repair of through holes,
There were many wasteful setups, such as groundwork treatments to smooth the surface to be removed, such as a funnel-shaped part.

(C) For safety The above-mentioned concrete placing and useless setup required high-place work, and there were many dangers.

In addition to the cost increase as a result of the above, in order to cover the difficulty of construction, soft concrete is often used, and the quality may be further reduced.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a concrete placing method capable of maintaining good quality of concrete, good workability, and safer work.

[Means for solving the problem]

In the concrete casting method according to the present invention, concrete is press-fitted from the side of a formwork and cast.

First, press-fit holes are formed in the weir plate of the formwork. A plurality of press-fit holes are formed at appropriate intervals vertically. A press-fitting machine is attached to each of the press-fitting holes. The press-fitting machine has a built-in piston that can be press-fitted by a jack, and when the sent concrete blocks around the press-fitting hole, it is pressed into the formwork by the piston, and when the press-fitting is completed, Is pressed down to the inner surface of the formwork so that the concrete surface becomes smooth after demolding.

At the top of the formwork and at the place where the air accumulates, attach an air vent pipe that connects the inside and outside of the formwork. As this air vent pipe, a flexible pipe made of, for example, vinyl chloride can be considered. In addition, a hard vinyl chloride pipe or the like may be used as the air vent pipe. In this case, an L-shaped air vent pipe connected by a joint is used. It is desirable that the joint be detachable. It is also preferable to provide a valve in the middle of the air vent pipe.

Normally, when the concrete pump is likely to be blocked by press-fitting, the piston of the press-fitting machine is operated to drive concrete into the formwork. In order to mount a plurality of press-fitting machines on the upper and lower sides, the press-fitting machines are sequentially operated from the lower press-fitting machines and concrete is poured from below the formwork.

When the height of the mold is high, a large number of press-fit holes are arranged in the vertical direction, and the interval between them is increased. If the lateral width of the mold is large, a plurality of press-fit holes are provided in the lateral direction.

(Operation)

By simply installing the press-fitting machine, unnecessary setup such as formation and repair of a through-hole as in the related art becomes unnecessary.

Since concrete is poured in order from the bottom, no impact is applied to the concrete. Therefore, no concrete separation occurs.

By arranging a plurality of press-fitting holes in the height direction and performing press-fitting while switching from bottom to top, it is possible to press-fit without increasing the side pressure. In addition, since the concrete is press-fitted sequentially from below, the concrete spreads sufficiently in the formwork. In addition, concrete can be dropped as long as it does not separate.

Air escapes from the top air vent tube, leaving no air in the formwork. If the vent tube is flexible, the vibrator can be inserted into the form using the vent tube.

〔Example〕

Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings.

In the figure, reference numeral 1 denotes a casting device, which is a cylindrical pressure-feed pipe 2
A cylindrical injection tube 3 is also connected to the side. A piston 5 that can reciprocate by a cylinder 4 that is a jack is housed in the pressure feed pipe 2. The cylinder 4 is connected to the pressure pipe 2 by a fixing ring 6.

A contact flange 7 projecting to the outer periphery is formed near the distal end of the pressure feed pipe 2, and further closer to the intermediate portion than the contact flange 7,
Similarly, a presser flange 8 that protrudes in the outer peripheral direction is formed. A stopper insertion tube 9 communicating with the inside of the pressure feed pipe 2 is fixed to the outer periphery near the distal end of the pressure feed pipe 2. Normally, the stopper 19 is inserted into the stopper insertion tube 9, and the pin 23 is penetrated from the side so that the stopper 19 does not project into the pressure feed pipe 2.

 A hose 10 is connected to the injection tube 3.

Pressing members 13 and 14 are used to fix the press-fitting machine 1 as described above to the weir plate 11 of the formwork. In the embodiment, a circular press-fitting hole 12 is formed in the weir plate 11 of the column form, and the tip of the pressure feed pipe 2 is fitted and connected to the press-fitting hole 12. The tip of the pressure pipe 2 is a weir plate
It is flush with 11 inner surfaces.

A horizontal pressing member 13 is hung on the pressing flange 8 of the press-fitting machine 1 and pressed. The holding member 13 is a single pipe. A vertical holding member 14 is overlapped with the horizontal holding member 13, and the holding member 14 is fixed to a lateral end 16 supporting the weir plate 11 by a rooted clamp 15.

The operation of placing concrete using the press-fitting machine 1 described above will be described.

<Construction Example 1> As shown in FIG. 3, when the width of the wall to be constructed is small, press-fit holes 12a and 12b are provided above and below the weir plate 11, and the press-fitting machines 1 are respectively attached to the press-fit holes 1 as described above. A flexible air vent pipe 17 made of vinyl chloride is attached to the top end of the mold.

First, the concrete 18 is cast from the lower press-fitting machine 1. The concrete is sent to the press-fitting machine 1 using the hose 10. By operating the pressure of the concrete pump and, if necessary, the cylinder 4, the concrete 18 that has entered the pumping pipe 2.
Extrude into the formwork. Although the concrete 18 falls slightly below the press-in hole 12a, the height is low and the concrete 18 does not separate.

Concrete 18 is press-fitted above the press-fitting hole 12a by the pressure of the concrete pump and, if necessary, by the cylinder 4. After the concrete is poured into the lower end of the upper press-in hole 12b, the piston 5 is extended so that the tip of the piston 5 is flush with the inner side surface of the dam plate 11. . In this state, the stopper insertion cylinder 9 is
And the stopper 17 is protruded into the pressure feed pipe 2 to prevent the piston 5 from retreating.

Then, the upper press-fitting machine 1 is operated to press-fit the press-fitting hole 12b upward. When the concrete 18 comes near the top, a vibrator 19 is inserted from the air release pipe 17 and the concrete 18 is further pressed into the top while leveling the concrete 18. Tighten the air release pipe 17 with a track or the like and concrete 18
To prevent overflow.

After the concrete 18 has hardened to a certain extent,
And repair it with concrete 18 '. (6th
(Fig. 7, Fig. 7) <Example 2> When the width of the wall is large, press-fit holes 12c to j are provided in the width direction of the weir plate 11 as appropriate, and the press-fitting machine 1 is inserted into each of the press-fit holes 12c to j.
Install.

By this press-fitting machine 1, the press-fitting holes 12c, 12d,
12e …… Press the concrete 18 into the formwork in the order of 12j.

Also, an air vent pipe 17 is provided at the top as described above,
At the same time as the air is evacuated, the vibrator 19 is inserted to level the concrete 18 at the top.

<Construction Example 3> When the width of the wall is extremely large, a joint may be provided as shown in FIG. 8 to form a column, or only the joint 20 may be provided in the middle to separate the walls. You may. The columns may be cast in advance or in a post-cast. In the embodiment, concrete is cast in the order of 12k, 12l... 12r.

The present invention has the above configuration, but the other
As shown in the figure, an air vent tube 17 formed of hard vinyl chloride is used. The air release pipe 17 is connected by a joint 21 to form an L-shape. At the beginning of the casting, the joint 21 is removed, and when the concrete 18 comes near the top end, a vibrator 19 is put in and the concrete 18 is leveled. I do. Then, after jointing, take in the defective concrete 18 with a lot of latencies into the pipe 17, then overflow the concrete 18 if necessary,
18 can be removed.

FIG. 10 shows an example in which an air vent pipe 17 having a valve 22 attached to an intermediate portion is used in order to prevent the concrete 18 from overflowing after the concrete 18 has been poured.

〔The invention's effect〕

The present invention has the above configuration, and can obtain the following effects.

Since concrete is poured from a plurality of press-fit holes arranged vertically, the height at which the concrete falls is small, and concrete does not separate. In addition, concrete is favorably filled in the form by press-fitting, and poor filling does not occur.

Compared with the conventional method, a funnel-shaped formwork for concrete casting and through holes for floors and beams are not required, and accordingly, useless setup such as finishing treatment is eliminated.

The air vent tube can be attached anywhere and there is no interference as in the conventional method, so that the implementation is limited, and there is no reduction in beam resistance due to the through hole. It is also suitable for tall parts and wide parts which were difficult with the conventional method.

The concrete filling at the top is reliable, there are no air pockets or voids due to concrete sinking unlike the conventional method, and mortar grout injection into the top is unnecessary.

 Work at high places can be greatly reduced, and work can be performed safely.

[Brief description of the drawings]

FIG. 1 is a side view of a press-fitting machine, FIG. 2 is a side view of a state where the mold is mounted on a mold, FIG. 3 is a front view of the mold, FIG. 4 is a longitudinal sectional view thereof, and FIG. FIG. 6 is a cross-sectional view of an attached state of an air vent pipe, FIG. 7 is a cross-sectional view of a repaired state, FIG. 8 is a front view of another formwork, FIG. 9 and FIG. It is a side view of an air release pipe. DESCRIPTION OF SYMBOLS 1 ... Press-in machine, 2 ... Press-feed pipe, 3 ... Injection pipe, 4 ... Cylinder, 5 ... Piston, 11 ... Weir plate, 12 ... Press-in hole,
13,14… Presser, 15… Clamp, 16… Thick end, 17
…… Vent pipe, 18 …… Concrete, 19 …… Stopper.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kiyokatsu Watanabe Kashima Construction Co., Ltd. Tokyo Branch, 1-3-8 Moto-Akasaka, Minato-ku, Tokyo (56) References JP-A-63-44077 (JP, A) Kosho 55-32160 (JP, B2)

Claims (2)

(57) [Claims] A plurality of press-fitting holes are provided on a weir plate of a mold at appropriate intervals vertically, and a press-fitting machine having a piston press-movable by a jack is attached to the press-fitting hole, and a top end of the mold and a pool of air are provided. A concrete casting method characterized by attaching air vent pipes where it is easy to install and then sequentially setting hardening material into the formwork from below through a press-fitting machine. 2. The concrete casting method according to claim 1, wherein a flexible pipe is used as the air vent pipe.