JP6755502B1 - Concrete construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete construction method for widening a range of leveling at one time in a short time as compared with a case of manually leveling by flexibly responding to a width of 1 to 20 m by on-site assembly. SOLUTION: In a concrete construction method in which concrete before hardening is poured, leveled and then hardened, (1) an assembly process of a screed device 200, (2) a concrete placing process, and (3) concrete compaction. It has a step and (4) a step of finishing the concrete surface, and the assembly step of the screed device 200 includes the end of the frame and the blade of the unit screed 300 and the end of the frame and the blade of the other unit screed 300. It is characterized in that a plurality of unit screeds are connected by connecting and. [Selection diagram] Fig. 1

Description

The present invention relates to a concrete construction method in which concrete before hardening is poured, leveled, and then hardened on both a flat surface (floor surface) and a slope surface (inclined surface).

Conventionally, a leveling device equipped with a leveling plate that comes into contact with the surface of concrete before hardening, a vibration generating means mounted on the leveling plate, and an operation handle attached to the leveling plate is used to surface the concrete. Using a finishing device equipped with a leveling process for leveling, a flat surface leveling machine with a propeller-shaped powered rotary iron, a flat plate-shaped finishing iron, and a weight that presses the finishing iron against the concrete surface. A floor surface construction method including a finishing process for finishing the surface of concrete is known (for example, Patent Document 1).

Japanese Patent No. 391263

However, the leveling step using the leveling device of the conventional floor construction method described above is a so-called tamping step of leveling while hitting the concrete while vibrating the leveling device in order to increase the strength of the concrete, and hardening. The leveling device can only be used after the previous concrete has been leveled to some extent.

Therefore, in the concrete leveling work in civil engineering pavement work and the like, a lot of manpower and cost are required by using a large screed device.

An object of the present invention is to provide a concrete construction method in which a width of 1 to 20 m can be flexibly adapted to a width of 1 to 20 m by on-site assembly to widen the leveling range at one time in a short time as compared with the case of manually leveling. Is.

The invention according to claim 1 is a concrete construction method in which concrete before hardening is poured, leveled, and then hardened, wherein (1) an assembly step of a screed device, (2) a concrete placing step, and (3). It has a concrete compaction process and (4) a concrete surface finishing process, and the assembly process of the screed device is performed on the frame and blade ends of the unit screed and the frame and blade of another unit screed. By connecting the end portion, the above-mentioned problems are solved by connecting the plurality of the unit screeds.

According to the second aspect of the present invention, in addition to the configuration of the concrete construction method according to the first aspect, two ropes wound around two manual winches provided in the screed device in the concrete compaction step. The screed device moves toward the end of the rope by utilizing the tension of the rope, and the moving direction of the screed device is substantially orthogonal to the long axis direction of the blade included in the screed device. It is to further solve the problems that have been solved.

In the invention according to claim 3, in addition to the configuration of the concrete construction method according to claim 1 or 2, in the concrete compaction step, the speed of the screed device is increased by the screed device 2 By adjusting the rotation of the two manual winches to achieve the desired speed, the above-mentioned problems are further solved.

According to the fourth aspect of the present invention, in addition to the configuration of the concrete construction method according to any one of claims 1 to 3, in the concrete compaction step, the cast concrete after compaction is used. The above-mentioned problems are further solved by adjusting the thickness of the two blades included in the screed device to a desired thickness by adjusting the height of the blade on the side opposite to the traveling direction of the screed device. It is something to do.

In the invention according to claim 5, in addition to the configuration of the concrete construction method according to any one of claims 1 to 4, the screed device and the screed device are used in the concrete assembly process. The above-mentioned problems are further solved by performing concrete finishing on one slope and both slopes by changing the two blades to be provided to blades having other shapes.

The concrete construction method of the present invention can not only pour concrete before hardening, level it, and then harden it, but also can exert the following peculiar effects.

According to the concrete construction method of the invention according to claim 1, since it can be assembled on site, it can flexibly respond to a width of 1 to 20 m.

That is, it is not necessary to repeat the roughing process or the like for work areas having different widths (for example, 4 m) using a conventional screed device having only a fixed width (for example, 3 m), so that the number of workers can be increased. A wide range of concrete can be leveled cleanly in a short time while reducing the amount.

According to the concrete construction method of the invention of claim 2, in addition to the effect of the invention of claim 1, concrete in a substantially rectangular range with the long axis direction of the screed device as the short side with respect to the work area is formed. It can be easily leveled.

According to the concrete construction method of the invention according to claim 3, in addition to the effect of the invention according to claim 1 or 2, the movement of the screed device with respect to the work area is controlled at a desired speed. It is possible to prevent the screed device from moving too fast and insufficiently placing concrete.

In addition, since the air and excess water inside the concrete escapes reliably, even when the construction is carried out over a wide area in a short time, it is possible to prevent the occurrence of cracks by eliminating the fine water passages and air pools inside the concrete. Can improve wear resistance and durability

According to the concrete construction method of the invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 4, the height of the blade can be adjusted on site, so that the height can be adjusted. It is possible to respond flexibly to work areas where there is a difference.

According to the concrete construction method of the invention according to claim 5, in addition to the effect of the invention according to any one of claims 1 to 5, the shape of the blade can be changed on site. Gradient and double slope finish is possible.

The figure which shows the flow of the concrete construction method in one Embodiment of this invention. The perspective view which shows the outline of the screed device in one Embodiment of this invention. The perspective view which shows the outline of the unit screed according to one Embodiment of this invention. The figure which shows the outline of the method of assembling the screed device in one Embodiment of this invention. The figure which shows a mode that the screed device in one Embodiment of this invention moves. The figure which shows the mode of adjusting the moving speed of the screed device in one Embodiment of this invention. The figure which shows the mode of adjusting the height of the blade provided with the screed device in one Embodiment of this invention. The figure which shows the mode of changing the shape of the blade provided in the screed device in one Embodiment of this invention.

Hereinafter, the concrete construction method according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 7.

Here, FIG. 1 is a diagram showing a flow of a concrete construction method according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an outline of a screed device according to an embodiment of the present invention. 3 is a perspective view showing an outline of the unit screed device according to the embodiment of the present invention, and FIG. 4 is a diagram showing an outline of a method of assembling the screed device according to the embodiment of the present invention. Is a diagram showing how the screed device in one embodiment of the present invention moves, and FIG. 6 is a diagram showing how the moving speed of the screed device in one embodiment of the present invention is adjusted. FIG. 7 is a diagram showing how the height of the blade included in the screed device according to the embodiment of the present invention is adjusted, and FIG. 8 is a diagram showing the shape of the blade provided by the screed device according to the embodiment of the present invention. It is a figure which shows the state of doing.
<Overall processing>
In the concrete construction method according to the first embodiment of the present invention, as shown in FIG. 1, first, an assembly process (step S101) of the screed device is performed.
Next, the concrete pouring process (step S102) is performed.
Next, the concrete is compacted (step S103).
Next, the concrete surface finishing treatment (step S104) is performed.

In this embodiment, a case where concrete is constructed on a flat surface will be described.

Step S101 is a process of assembling one screed device by connecting a plurality of unit screeds at a work site. The details of the screed device are shown in FIG. The details of the unit screed are shown in FIG.

Step S102 is a concrete pouring process performed by pouring concrete before hardening into a work area.

Step S103 is a concrete compaction process performed by placing the concrete poured in S102 using the screed device assembled in S101.

The step S104 is a finishing treatment of the concrete surface performed by finishing the surface of the concrete compacted in S103.
<Screed device>
As shown in FIG. 2, the screed device 200 includes a long shaft frame 210, a frame support 220, a side frame 230 (and 231), a manual winch 240 (and 241), a frame joint 250, and a blade. It includes 260 (and 261), a blade joint 270, and an air high frequency vibrator 280.

Of these, the long axis frame 210 is provided in a long length and is supported by the frame support member 220. Further, the long axis frame 210 is joined so that the axial direction of the long axis frame 210 and the surface of the side frame are orthogonal to the vicinity of the center of the side frame 230 (and 231).

The material of the long axis frame 210 is made of a metal such as steel or aluminum. The diameter of the cross section of the semimajor frame 210 is 5 cm to 15 cm, but is not particularly limited.

The length of the long-axis frame 210 of the screed device 200 is a numerical value obtained by multiplying the length of the long-axis frame 210 for the unit screed 300 by the quantity of the unit screed 300. For example, when the length of the long axis frame 210 for the unit screed 300 is 1 m and the quantity of the unit screed 300 is 3, the length of the long axis frame 210 of the screed device 200 is 1 m × 3 = 3 m. Is.

The frame support member 220 integrally forms a truss structure and supports the semimajor frame 210.

The frame support material 220 is made of a metal such as steel or aluminum. The diameter of the cross section of the frame support member 220 is 3 cm to 9 cm, but is not particularly limited.

The frame support member 220 forms a triangular truss structure by anti-vibration welding.

The side frame 230 is installed at the end of the screed device 200 and is joined to the long axis frame 210 so that the axial direction of the long axis frame 210 and the surface of the side frame 230 are orthogonal to each other. Further, the side frame 230 is joined to the blade 260 (and 261) so that the axial direction of the blade 260 (and 261) and the surface of the side frame 230 are orthogonal to each other.

That is, as shown in FIG. 2, the side frame 230 and the side frame 231 are joined so as to be sandwiched from both ends of the long axis frame 210 and the blade 260 in the axial direction.

The side frame 230 is made of a metal such as steel or aluminum. The thickness of the member of the side frame 230 is 5 cm to 15 cm, but is not particularly limited.

The manual winch 240 is joined to the side frame 230. Further, the manual winch 241 is joined to the side frame 231. The method of joining the manual winch 240 is screw joining or welding joining.

Instead of the manual winch 240, the screed device 200 may include an electric winch.

The frame joint portion 250 joins two long-axis frames 210 to each other at the end of the long-axis frame 210. Details will be described later.

The blade 260 is provided long and is joined so that the axial direction of the blade 260 and the surface of the side frame are orthogonal to the vicinity of the lower end of the side frame 230 (and 231). The blade 260 is joined to the frame support member 220 and the side frame 230, 231 by screw joining or the like.

Similarly, the blade 261 is provided long and is joined so that the axial direction of the blade 261 and the surface of the side frame 230 (and 231) are orthogonal to the vicinity of the lower end of the side frame 230 (and 231). .. The blade 261 is joined to the frame support member 220 and the side frame 230, 231 by screw joining or the like.

The blades 260 and 261 are made of a metal such as galvanized steel. The size of the members of the blades 260 and 261 is, for example, 10 gauge, but is not particularly limited.

The blade joint portion 270 joins two blades 260 to each other at the end portion of the blade 260. Details will be described later.

The air frequency vibrator 280 is joined to the blade 260 or blade 261 or to the blade 260 and blade 261. Further, the air high frequency vibrator 280 is provided with a tamping plate portion 281 on the bottom surface.

The air high frequency vibrator 280 is provided between the blade 260 and the blade 261 and is configured to vibrate in the direction perpendicular to the tamping surface integrally with the tamping plate portion 281. Further, the air high frequency vibrator 280 can vibrate at a frequency of, for example, 19000 vpm, but the frequency is not limited to this.

The air high frequency vibrator 280 may be configured by an engine or by an electric motor using a rechargeable battery as a power source.

When the air high frequency vibrator 280 is being driven, the tamping plate portion 281 is in a state of floating from the concrete surface due to vibration, so that the operator can easily operate and move the screed device 200.

Before tamping, there is a fine air AR and excess water WT inside the cement C1 in the concrete before hardening. In addition, excess water WT tends to accumulate below the aggregate C2 in the concrete before hardening. Further, due to the difference in specific gravity, water having a specific gravity smaller than that of cement C1 or aggregate C2 tends to move upward, and a fine water passage WP is formed.

By tamping the concrete before hardening with the air high frequency vibrator 280, vibration is applied to the inside of the concrete before hardening, and the air AR inside moves to the surface and escapes from the surface to increase the density of the concrete.

Further, vibration is applied to the inside of the concrete before hardening, and the aggregate C2 having a large specific gravity inside moves downward, and the surplus water WT having a small specific gravity moves to the surface and floats on the surface, so that the density of the concrete increases. ..

In other words, excess water WT moves to the surface and floats on the surface, and by sufficient compaction finish, excess water is removed, fragile parts of the concrete surface layer such as latency are removed, and a high-quality cement paste layer is formed on the concrete surface layer. As a result, the density of concrete increases.

As a result, the strength of the hardened concrete can be increased. Further, even when the construction is carried out over a wide area in a short time, it is possible to eliminate the accumulation of the fine water passage WP and air AR inside the concrete and make it difficult for cracks to occur.

Further, the air high frequency vibrator 280 can be used for construction by spanning using a bunian striker (a machine that rotationally drives the striker tube by a hydraulic motor). The striker tube means a striker tube roller type concrete simple finisher.

In this way, by performing the construction by spanning with a bunian striker, the concrete can be scraped up from underwater to above the water by the rotational movement of the rollers, and the worker can do unevenness that was impossible with conventional manual work. It is possible to easily create a slope surface with a small amount of water.
<Unit screed>
As shown in FIG. 3, the unit screed 300 includes a long shaft frame 210, a frame support member 220, a frame joint 250, a blade 260 (and 261), a blade joint 270, and an air high frequency vibrator 280. The frame side joint portion 310 and the screw hole 320 are provided.

The unit screed 300 has a length in the longitudinal direction of 0.6 m to 1.5 m. The unit screed 300 has a length of 30 cm to 50 cm in the lateral direction. The unit screed 300 has a height of 40 cm to 80 cm. The size of the unit screed 300 is not particularly limited.

The unit screed 300 weighs 17 kg to 42 kg, but is not particularly limited to this value.

The frame side joint portion 310 is a joint portion for joining the long shaft frame 210 and the side frame 230 (or 231).

The unit screed 300 can be joined by connecting with another unit screed 300. Specifically, the unit screed 300 joins the frame joint portion 250 included in the unit screed 300 and the frame joint portion 250 included in the other unit screed 300.

As shown in FIG. 4A, the frame joint portion 250 constituting the unit screed 300 has a cylindrical shape and has a female thread 251 inside thereof. Further, the long axis frame 210 constituting the unit screed 300 has a male thread 211.

The long-axis frame 210 is inserted into the cylinder of the frame joint portion 250 in the axial direction (in the direction indicated by the arrow 401 in FIG. 4A), and the male thread 211 is inserted into the female thread 251 of the frame joint portion 250. By screwing it to the frame joint portion 250, it is screwed.

Further, as shown in FIG. 4A, the semimajor frame 410 constituting the other unit screed 300 has a male thread 411.

The long-axis frame 410 is inserted into the cylinder of the frame joint portion 250 in the axial direction (in the direction indicated by the arrow 402 in FIG. 4A), and the male thread 411 is inserted into the female thread 251 of the frame joint portion 250. By screwing it to the frame joint portion 250, it is screwed.

As shown in FIG. 4B, the blade 260 constituting the unit screed 300 is a horizontal member having an L-shaped cross section and has a screw hole 320 at its end. Further, the unit screed 300 has a cushioning material 420 that is adhered between the blade 260 that constitutes the unit screed 300 and the blade 260 that constitutes another unit screed 300.

The length of the cushioning material 420 can be different from 6 cm to 30 cm, with the direction in the long axis direction of the blade 260 as the length. The material of the cushioning material 420 can be the same galvanized steel as the blade 260, but is not particularly limited.

As shown in FIG. 4B, the blade joint 270 has a plurality of perforations 430. The distance 432 between the centers of the perforations 430 is not particularly limited. The longitudinal width of the cushioning material 420 can be changed according to the size of the center-to-center distance 432.

As shown in FIG. 4B, the blade joint portion 270 connects the two blades 260 and the cushioning material 420 to each other in the axial direction of the shaft 431 connecting the centers of the screw holes 320 and the drilling 430. Join so that the sides are crimped together.

Next, the unit screed 300 matches the screw hole 320 of the blade 260 provided in the unit screed 300 with the perforation 430 of the blade joint portion 270, and the same screw 440 is screwed into the matched screw hole 320 and the perforation 430. It is inserted in the direction of the shaft 431 connecting the centers of the 440 and the screw hole 320 and the perforation 430.

After that, by screwing the screw 440, the blade joint portion 270 joins the two blades 260 and the cushioning material 420 so that the side surfaces thereof are crimped to each other.

The cushioning material 420 is joined so as to be located near the center of the blade joint portion 270. As a result, it is possible to prevent the bias of the stress (bending moment) generated between the blades due to the screw joining between the blade joint portion 270 and the blade 260. That is, the rigidity of the screed device 200 after the unit screed 300 is connected can be stabilized.

Further, as shown in FIG. 4C, without arranging the cushioning material 420, the blade joint portion 270 connects the two blades 260 and the cushioning material 420 to each other by screwing the screw 440. Can be joined so that they are crimped.

By joining the unit screed 300 to another unit screed 300 in this way, the screed device 200 can be assembled on-site, so that the width of 1 to 20 m can be flexibly accommodated.

That is, since it is not necessary to repeatedly perform the roughing step and the like for work areas having different widths (for example, 4 m) using a conventional screed device having only a fixed width (for example, 3 m), the number of workers is increased. It is possible to reduce the amount of concrete and even out a wide range of concrete in a short time.

Further, since the length of the screed device 200 can be adjusted in units of several cm by having the option of arranging the cushioning material 420 or not, it is possible to adjust the fine width of the work area 500.
<About the movement of the screed device>
As shown in FIG. 5A, the screed device 200 is joined to the tow rope 510 wound around the manual winch 240 joined to the side frame 230 of the screed device 200 and to the side frame 231 of the screed device 200. It is moved by a tow rope 511 wound around the manual winch 241.

That is, the screed device 200 moves toward the end of the rope by utilizing the tension of the two tow ropes 510 and 511 wound around the two manual winches 240 and 241 included in the screed device 200.

Specifically, first, the two tow ropes 510 (or 511) are wound on one end side around the manual winch 240 (or 241). Next, as shown in FIG. 5B, the two tow ropes 510 (or 511) are connected to a worker, a towing machine, or a structure 540 fixed on the ground on the other end side, or the like. Be retained.

The tow rope 510 (or 511) is integrally formed of a hook-shaped hook 530 at the end on the side not wound around the manual winch 240 (or 241). By doing so, the two tow ropes 510 (or 511) can be easily held by the other end side being tied to a worker, a towing machine, or a structure 540 fixed on the ground.

After that, tension is generated by holding the two tow ropes 510 (or 511) by binding the other end side to a worker, a tow machine, or a building 540 fixed on the ground.

By making the tensions generated in the ropes equal, that is, by matching the external forces applied to the screed device 200 by the two tow ropes, the acceleration vector becomes constant in the same direction. Therefore, by controlling the moving direction of the initial screed device 200 in a direction substantially orthogonal to the long axis direction of the blade 260 included in the screed device 200, the moving direction of the screed device 200 is the long axis of the blade 260 included in the screed device 200. It can be maintained in a direction substantially orthogonal to the direction.
<Concrete pouring process>
As shown in FIG. 5B, the two tow ropes 510 and 511 are installed in a plane substantially parallel to each other at intervals.

Then, the ready-mixed concrete is poured into the work area 500 including the vertical projection area on the floor surface between the two tow ropes 510 and 511 installed parallel to the horizontal direction.

The worker roughly spreads ready-mixed concrete with a scraping board or a rake so that there is no large bias with respect to the work area 500. Then, the level of concrete construction is determined using the level bar. Hereinafter, the method of leveling the concrete will be carried out by using a known means.
<Adjustment of moving speed of screed device>
As shown in FIG. 6, the screed device 200 can adjust the speed of the screed device 200 to a desired speed by adjusting the rotations of the two manual winches 240 and 241 included in the screed device 200.

The manual winch 240 has a rotary lever 610 and a drum 620. Similarly, the manual winch 241 has a rotary lever 611 and a drum 621. Further, the drum 620 is wound with a tow rope 510. The drum 621 is wound with a tow rope 511.

As shown in FIG. 6A, the operator 600 rotates the rotary lever 611 of the manual winch 240 (or 241) in the direction in which the tow rope 510 (or 511) winds around the drum 621. , The screed device 200 is moved in the rope pulling direction 520.

More specifically, as described above, one end of the tow rope 510 (or 511) is fixed by being held by a worker, a towing machine, or a building 540 fixed on the ground. In the state, tension is generated by rotating the manual winch 240 (or 241) at the end of the tow rope 510 (or 511) wound around the manual winch 240 (or 241).

Then, the screed device 200 moves in the direction in which the tension generated in the tow rope 510 (or 511) is pulled together (arrow 520 in FIG. 6).

At this time, the operator 600 can continuously generate tension on the tow rope 510 (or 511) by continuously rotating the rotary lever 611, and the screed device 200 continues to move.

In other words, the operator 600 can stop the rotation of the rotary lever 611 so that tension is not generated in the tow rope 510 (or 511), and the movement of the screed device 200 can be stopped.

That is, the operator 600 can control the tension generated in the tow rope 510 (or 511) by rotating the rotary lever 611 at a desired speed, and as a result, the moving speed of the screed device 200 is desired. Can be adjusted to the speed of.

As shown in FIG. 6B, since the tow rope 510 and the tow rope 511 are located in a substantially parallel relationship with each other, the rotation speed given to the manual winch 240 and the manual winch 241 are relative to each other. When the applied rotation speed is the same, the screed device 200 equalizes the tension generated in the two ropes and matches the external force applied to the screed device 200 by the two tow ropes to match the screed device. The acceleration acting on the 200 can be made constant in the same direction.

Then, by controlling the moving direction of the initial screed device 200 in a direction substantially orthogonal to the long axis direction of the blade 260 included in the screed device 200, the moving direction of the screed device 200 is the long axis of the blade 260 included in the screed device 200. It can be maintained in a direction substantially orthogonal to the direction.

By controlling the movement of the screed device 200 with respect to the work area 500 at a desired speed in this way, it is possible to prevent the screed device 200 from moving too quickly and insufficiently placing concrete.
<Adjustment of blade height of screed device>
As shown in FIG. 7, the thickness of the cast concrete 700 after compaction is the blade 261 (or 261) of the two blades 260 (or 261) included in the screed device 200, which is opposite to the traveling direction of the screed device 200. Alternatively, the desired thickness can be obtained by adjusting the height of 260).

For example, as shown in FIG. 7, when the thickness of the cast concrete 700 before compaction is not uniform and the surface 720 before casting has a distorted cross-sectional shape between, for example, 5 to 8 mm, the screed device. By adjusting the height of the blade 261 on the side opposite to the traveling direction of the screed device 200 among the two blades 260 and 261 provided in the 200, the thickness of the cast concrete 700 after compaction can be set to 3 mm.

Specifically, for example, in order to adjust the height of the blade 261, first, a plurality of screw holes are provided in advance in the height direction at the joint portions of the frame support member 220 and the side frame 230 and 231 to which the blade 261 is joined. Keep it.

Next, when screw-joining the blade 261 to the frame support member 220 and the side frame 230 and 231, the operator desires the height from among the plurality of screw holes provided in the frame support member 220 and the side frame 230 and 231. Select the screw holes accordingly.

After that, the operator screw-joins the blade 261 to a screw hole selected according to a desired height from a plurality of screw holes provided in the frame support member 220 and the side frame 230, 231.

At this time, the blade 261 is arranged higher than the blade 260 by the height of 740 from the contact surface 710 between the bottom surface of the screed device 200 and the concrete surface to the surface 730 after casting.

By adjusting the height of the screw joint of the blade 261, the thickness of the cast concrete 700 after compaction can be made uniform, and the cross-sectional shape of the surface 730 after casting can be made substantially rectangular.

By doing so, the operator can adjust the height of the blade 260 (or 261) at the site, so that it is possible to flexibly respond to a work area or the like having a difference in height.
<Change of blade shape>
As shown in FIG. 8, the screed device 200 can perform concrete finishing on one slope and both slopes by changing the two blades 260 and 261 included in the screed device 200 to blades having other shapes.

For example, as shown in FIG. 8, the concrete casting target is a slope 810 having an inclination angle, the thickness of the cast concrete 700 before compaction is not uniform, and the surface 820 before casting is, for example, 5 to 8 mm. When the cross-sectional shape is distorted between the two blades 260 and 261 provided in the screed device 200, the shape of the blade 260 in the traveling direction of the screed device 200 is changed to the blade 800, and the traveling direction of the screed device 200. By changing the shape of the blade 261 on the opposite side to the blade 801 so that the cross-sectional shape of the surface 730 of the compacted concrete 700 after casting can be leveled to a substantially rectangular shape.

Specifically, the operator first prepares in advance a substantially L-shaped blade whose cross-sectional shape is not a right-angled L-shape, that is, whose internal angle is an acute angle or an obtuse angle.

Next, when changing the blades 260 and 261 to the blades 800 and 801 the operator selects the blades 800 and 801 having an angle close to the inclination angle of the slope 810 as an internal angle.

After that, the operator screw-joins the blades 800 and 801 to the screw holes selected according to the desired height from the plurality of screw holes provided in the frame support member 220 and the side frame 230 and 231.

By doing so, the operator can change the shape of the blade 260 (or 261) in the field, so that a single-gradient or double-gradient finish can be performed.

As described above, the case where concrete is applied to a horizontal surface has been described, but concrete may be applied to a slope.

Moreover, the place where concrete is constructed may be either outdoors or indoors.

200 ... Screed device 210 ... Long shaft frame 220 ... Frame support member 230 ... Side frame 240 ... Manual winch 250 ... Frame joint 260 ... Blade 270 ... Blade joint Part 280 ・ ・ ・ Air high frequency vibrator 300 ・ ・ ・ Basic screed C1 ・ ・ ・ Cement C2 ・ ・ ・ Aggregate WT ・ ・ ・ Surplus water WP ・ ・ ・ Fine water passage AR ・ ・ ・ Air

Claims (4)

In the concrete construction method in which concrete before hardening is poured, leveled, and then hardened.
(1) Assembling process of screed device and
(2) Concrete placing process and
(3) Concrete compaction process and
(4) Has a concrete surface finishing process
In the assembly process of the screed device, a plurality of the unit screeds are connected by connecting the end portions of the frame and the blade of the unit screed and the end portions of the frame and the blade of the other unit screed .
Of the two blades included in the screed device, the screed device uses a blade in the traveling direction of the screed device as a substantially L-shaped blade having an acute internal angle in cross section, and the traveling direction of the screed device. By changing the blade on the opposite side to a substantially L-shaped blade with an obtuse internal angle in the cross-sectional shape, concrete finishing is performed on the uphill slope.
Of the two blades included in the screed device, the screed device uses a blade in the traveling direction of the screed device as a substantially L-shaped blade having an obtuse internal angle in cross section, and the traveling direction of the screed device. By changing the blade on the opposite side to a substantially L-shaped blade with an acute internal angle in the cross-sectional shape, a concrete finish is applied to the downward slope.
The long axis of the side frame of the screed device is vertical regardless of the inclination angle of the gradient.
The screed device installs a blade in the traveling direction of the screed device higher by the height from the contact surface between the bottom surface of the screed device and the concrete surface to the surface after casting, and finishes concrete on the gradient. ,
Concrete construction method. In the concrete compaction process,
The screed device is moved toward the end of the rope by utilizing the tension of the two ropes wound around the two manual winches provided in the screed device.
The moving direction of the screed device is substantially orthogonal to the long axis direction of the blade included in the screed device.
The concrete construction method according to claim 1. In the concrete compaction process,
The speed of the screed device is a desired speed by adjusting the rotation of two manual winches provided in the screed device.
The concrete construction method according to claim 1 to 2. In the concrete compaction process,
The thickness of the cast concrete after compaction is a desired thickness by adjusting the height of the blade of the two blades provided in the screed device, which is opposite to the traveling direction of the screed device. Characterized by,
The concrete construction method according to claim 1 to 3.