JPH0623509B2 - Concrete self-leveling automatic placing method and automatic placing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a concrete self-leveling method for automatically constructing a concrete placing surface horizontally by making use of the weight of the concrete, and particularly to concrete placing. The present invention relates to a concrete self-leveling automatic pouring method and an automatic pouring machine for automatically kneading and integrating a surface layer and a self-leveling agent.

(Prior Art) Construction of concrete slabs is carried out at many sites by the conventional monolithic construction method. It is carried out by pumping fresh concrete to the concrete pouring position, distributing it while swinging the tip of the hose cylinder, then leveling by earthwork, and the process of plastering the ruler, wooden iron, and iron iron.

On the other hand, in recent years, by pouring a hydraulic mixture with good fluidity onto a solid floor such as a concrete slab surface, a horizontal floor is formed by natural flow due to the self-weight of the mixture, the so-called self-leveling method (casting method). Floor construction method and self-level floor construction method) have become popular.

The advantage of this construction method is that it can obtain a highly efficient and horizontal construction surface without requiring skill, and is advantageously applied to form a horizontal floor surface in buildings and other general buildings. ing.

In order to further develop this method, when pouring onto self-leveling materials such as slabs on unleveled floor surfaces, it has excellent initial fluidity, solid-liquid separation does not occur during curing, and uniform horizontal flooring. It is required to form a surface, to have no volume shrinkage during curing, to have good workability and workability, and in order to improve it, development of additives for self-leveling materials, research of composition, etc. have been promoted. It was

(Problems to be solved by the invention) However, in the above-mentioned monolithic construction method, even if an improvement method such as a level ruler method or a point method is tried, a flatness is obtained tentatively when comprehensively applied on a large area surface. It looks like something
When observing on a small area surface, there are many concavo-convex shapes, and eventually the horizontal accuracy of the concrete surface is not improved. Also, in this method, the surface of the concrete is pressed and polished with a gold iron so that the cement slag of the concrete gathers on the surface layer and the fragile leitance layer does not exist. If you make a mistake, the concrete in the surface layer will have a high water-cement ratio due to breathing, resulting in a floor surface with low surface strength.

Also in the self-leveling method described above, the concrete surface after work hardening appears to be a horizontal surface at first glance, but considerable unevenness can be seen at a close distance.

And, since the self-leveling material layer is in a state of being adhered to the concrete slab surface in the first place, if the surface of the base slab is weak, they will be separated from each other. That is, the adhesive force between the self-leveling material and the slab is generally 5 kg / cm.
^{Although it is set to 2} or more (material age 28 days), this adhesive force is determined by the state of the interface between the concrete and the self-leveling material (SL material), and the adhesive strength increases when the concrete surface strength is high. Therefore, the reality is that there is always a problem of peeling even with a good quality SL material.

Further, in this construction method, if the coating thickness is thin, a large wave front remains on the construction surface, the process capability index (CP) is not improved, and conversely, if it is thick, the cost becomes high. In addition, it is impossible to completely prevent defects such as air bubbles, wrinkles, and cracks in the SL material that occur due to the influence of the base.

The air bubbles are generated because, during construction, water in the SL material is rapidly absorbed by the concrete slab at the contact surface, so the air inside the concrete is replaced and remains on the SL material surface to form air bubbles. It is probable that the SL material that was set rocked and wrinkled or had fine cracks caused by the inadequate ruler smoothing at the time of construction.

By the way, as is well known, since the slab itself is flat, the surface area (m
^The ratio of ² / m ³ ) is large, and therefore it dries quickly and shrinks greatly (3 months in financial terms), so its strength is lower than that of columns and beams made of the same quality concrete. It is inevitable, and therefore its strength is desired to be increased.

Further, even in the construction, the craftsmen leveled the self-leveling material with a hand and the workability was not good in terms of supply and construction of the self-leveling material.

(Means for Solving Problems) The present inventors have completed the present invention described below as a result of repeated research to solve the above problems.

That is, the present invention is characterized by running on a concrete placing surface in a state where breathing is occurring, adding the supplied self-leveling agent to the concrete surface layer portion and kneading, and then leveling the surface. Automatic leveling pouring method and automatic self-leveling pouring method with a leveling ruler for adding and kneading the self-leveling agent from the self-leveling agent receiving device to the moving vehicle traveling on the concrete pouring surface It is a machine.

(Operation) According to the present invention, (1) the superfluidizing agent is applied only to the concrete surface layer portion during breathing immediately after the concrete is run by traveling on the cast concrete without adhering the SL material to the concrete surface of the slab. Mixing with the compounded SL material to form a self-leveling layer, automatically leveling it integrally, and then applying a leveling ruler to make the concrete surface microscopically less uneven, and ( 2) At this time, by adding the required SL material compounding agent to the concrete, at the same time, the surface layer of the concrete is improved all at once and the strength, abrasion resistance, shrinkability and the like are given to the concrete. .

Therefore, the present invention is applied to the case where the surface layer portion of the cast concrete is not yet solidified and can be kneaded by physical means. Therefore, the meaning of "breathing state" refers to the state in which the first metal ironing work can be carried out until the breathing water does not deteriorate the quality of the concrete even after kneading. It is a time of 30 to 180 minutes. In addition to the ordinary SL material, various additives (strengthening agent, expanding agent, fluidizing agent, etc.) for improving the characteristics of the slab surface layer can be added to the SL material used in the present invention. .

Further, when kneaded with the slab concrete composition, SL
You may use only the addition component which changes.

Then, the concrete self-leveling automatic placing machine of the present invention supplies the self-leveling agent received by freely moving the concrete placing surface in the breathing state to the leveling ruler which also slides at any position, and the concrete surface It works by adding and kneading the parts to the self-leveling of the surface layer part of the cast concrete. At this time, since the vibrating means is provided on the leveling ruler, it is possible to prevent the coarse aggregate in the concrete from protruding to the concrete surface, and an ideal horizontal uniform surface can be obtained.

(Example) A concrete self-leveling automatic placing method and an automatic placing machine according to the present invention will be described with reference to the drawings.

1 and 2 are a side view and a plan view of the same automatic placing machine. The automatic placing machine 1 has a vehicle body 2 in the center, and has caterpillars 3 and 3'on both sides thereof. Even if a moving vehicle travels on uncured concrete 8 in a breathing state, its weight is dispersed and the concrete It does not affect the concrete surface while keeping the top floating. On the vehicle body 2, a self-leveling agent (hereinafter referred to as SL agent) receiving device 4 is arranged integrally with a swivel board 5 so that a driver 6 can operate an automatic placing machine. A leveling ruler 9 is attached to the swivel plate 5 with a stretchable support member 7 interposed therebetween. The leveling ruler 9 has a rope-shaped hanging member 10 wound therein and unrolled to adjust its length. Although it can be brought into and out of contact with the concrete surface, the operation of the suspension member 10 and the expansion and contraction of the support member 7 are linked to enable automatic operation.

The receiving device 4 includes a SL 11 pressure-feeding hose 13 supported by a suspension ring 12 on a wire 11 that freely moves on the ceiling and a SL.
The agent is replenished, and the supply pressure is controlled by the receiving device 4 and then supplied to the leveling ruler 9.

Next, the operation of the automatic placing machine will be described. The driver appropriately moves the automatic placing machine 1 while looking at the breathing state of the slab concrete, advances it close to the construction position, and stops the automatic placing machine 1 parallel to the wall in the predetermined direction. For this movement, the wire 11 suspended from the wall so that the driving machine can be moved easily moves with the movement of the automatic driving machine 1, and the suspension ring 12 on the wire 11 is placed on the wire. And slide the SL agent pressure feeding hose 13 along with the automatic placing machine.

At this time, the support member 7 and the hanging member 10 of the leveling ruler are in the state of being shortened to the maximum, and the leveling ruler 9 is close to the vehicle body 2 and is away from the concrete surface. Therefore, the driver 6 extends these from a predetermined position and lands the leveling ruler 9 on the concrete in a state where the tip end of the construction is straddled and the striking surface.

Next, the SL agent to be supplied is added to the surface layer portion of the concrete while controlling the pressure feeding pressure while observing the state of the concrete surface, and the SL agent is kneaded.

In this state, the driver shortens the support member 7 of the leveling ruler to continue the work in front of the automatic placing machine, stops the ruler when almost reaching the planned position, and retracts only the caterpillar. Then, pull the ruler again to continue the process.

For concrete placement, normal cement 336 Kg / m ³ ,
Sand 789 kg / m ³ , crushed stone 951 kg / m ³ , water 198 kg / m
³ , a composition of design standard strength (Fc) of 210 kg / cm ² (however, water cement ratio: 59%, maximum size of gravel: 2
0 m / m, slump: 18 cm) is used to cast into a slab, and after 40 minutes, SL is applied while kneading the surface layer of the cast surface.
The agent was added.

SL agent formulation is gypsum 150kg, blast furnace cement type B 18
0kg, potassium sulfate 1.5kg, superplasticizer 2kg, water retention agent 0.125kg, defoamer 0.065kg, water 72.5k
g composition composition (however, flow (2 minutes): 212 × 21
0) was used.

An example of a leveling ruler used in this method is shown in FIG.

As shown in the figure, the SL agent is injected from the injection nozzles 16 provided at about 5 points at the tip of the SL agent pressure-feeding hose 13 to the concrete pouring surface layer portion 8 at a pressure of about 4 to 5 Kg / m ² , and the spiral which can be positioned vertically The surface layer portion is kneaded by the rotation of the blade mixer 15, and at the same time, the SL agent is added,
It fluidizes and becomes a self-leveling layer.

After the surface improvement treatment, the spiral blade mixer 15 has the same vertical groove 19
When the leveling ruler is stored in the upper end of the concrete and smoothly moved by the support member 7, the surface layer of the concrete slab is formed on the horizontal concrete surface by the leveling work of the concrete leveling plate 14, and microscopically. Also has a surface with very few irregularities.

At that time, it is very effective to attach a vibrating device (vibrator) 17 to the leveling ruler in order to help smooth the driving surface and increase the sinking of the coarse aggregate 18.
This is because the vibration of the vibrator 17 is transmitted to the concrete leveling plate 14 and acts on the cast concrete surface portion, the coarse aggregate is easily submerged, and a smooth concrete surface is formed.

Incidentally, the concrete self-leveling automatic placing machine according to the present invention may be controlled remotely without the driver boarding. For this purpose, the reference point provided at the position where the slab surrounds the slab is known by the detection sensor provided in the driver's seat on the revolving disc 5, and this is compared with the position signal of the leveling ruler. The hanging member 10 is controlled to accurately maintain a predetermined position and slab thickness.

Further, the SL agent pressure supply hose 13 may be directly connected to the leveling ruler 9 without being connected to the SL agent receiving device 4.

(Effects of the Invention) As described above, the present invention is to move and move on the concrete placing surface in the breathing state to knead and add the SL agent, so that the concrete surface in the conventional monolithic construction method is It was possible to solve the problems of unevenness and the problems of the SL method all at once. The interface between the slab concrete and the SL concrete is not kneaded in the conventional manner but is kneaded and integrated, so that the disadvantage that the surface layer of the concrete product peels off can be eliminated. .

Further, by adding a modifier for the surface layer of the slab concrete to the SL agent, various physical properties of the surface layer of the slab concrete can be arbitrarily set at the same time when SL is added.

[Brief description of drawings]

1 and 2 are a side view and a plan view of an apparatus according to an embodiment of the present invention,
FIG. 3 shows a side sectional view of a leveling ruler. 1: Automatic placing machine, 2: Vehicle body 3, 3 ': Caterpillar 4: Self-leveling agent receiving device 5: Turning plate, 7: Support member 8: Concrete surface, 9: Leveling ruler 10: Hanging member 13: Self-leveling Agent pressure feeding hose 14: Concrete leveling plate 15: Spiral blade mixer 16: Self-leveling agent injection nozzle 17: Vibrator 18: Coarse aggregate 19: Spiral blade mixer vertical facing groove

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Minoru Ueda 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Noriyuki Nakamura 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Ryoichi Inazawa 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Toshio Kumagai 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Ken Incorporated Co., Ltd. (72) Inventor Yasuo Kajioka 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Shigemasa Suematsu 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Construction In-house (56) References Microfilm (JP, U) of the detailed description and drawings attached to the application of Japanese Patent Application No. Sho 60-179550 (No. Sho 62-88034)

Claims (7)

[Claims] 1. A concrete self made by running on a concrete placing surface in a state where breathing is occurring, adding and kneading the supplied self-leveling agent to the concrete surface layer portion, and then leveling the surface. Automatic leveling placement method. 2. A self-leveling automatic concrete leveling machine comprising a self-leveling agent receiving device and a leveling ruler for adding and kneading the self-leveling agent from the receiving device to a surface layer of the concrete on a moving vehicle traveling on a concrete placing surface. Equipment. 3. The concrete self-leveling automatic placing machine according to claim 2, wherein the leveling ruler can be turned on a moving vehicle. 4. The concrete self-leveling automatic placing machine according to claim 2 or 3, wherein the leveling ruler is movable with respect to the moving vehicle. 5. The concrete according to any one of claims 2 to 4, characterized in that the leveling ruler is provided with a self-leveling agent adding means and a kneading means for the surface layer of the concrete placing surface in a breathing state. Self-leveling automatic placing machine. 6. The concrete self-leveling automatic placing machine according to claim 5, wherein the vibrating means is provided on the leveling ruler. 7. The concrete self-leveling automatic placing machine according to any one of claims 2 to 6, wherein the traveling of the moving vehicle and the operation of the leveling ruler are remote controls.