JPH022730Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention is applicable to asphalt pavements on automobile test courses, for example.
The present invention relates to a screed attachment device for asphalt finishing which is extremely effective when a paved surface must be finished faithfully to a certain set waveform.

<Prior Art> As is well known, in a conventional asphalt finisher, a screed is rotatably mounted on the lower surface of a leveling arm, and the direction angle (attack angle) of the screed can be adjusted using a thickness handle. By increasing the upward angle of the screed, the force applied to the screed by the asphalt mixture increases, so the screed is pushed up and the leveling thickness increases. Since the screed is pushed up by a rotational movement about the traction point at the tip of the leveling arm, as the height of the screed increases, the upward angle gradually becomes smaller and the screed pushing force gradually weakens. In this way, the screed's own weight and the screed pushing force eventually balance out,
The screed will automatically be kept in its new balanced position. This is called the leveling effect of the floating screed.

<Problems that the invention attempts to solve> Recently, on the pavement of automobile driving test courses,
There are times when it is necessary to perform pavement construction faithfully to a certain set waveform. However, since conventional asphalt finishers are machines whose purpose is to flatten paved surfaces, they are completely unsuitable for meeting the above requirements, and as a practical matter, they are impossible to implement. It was hot.

As a result of various studies on ways to forcibly shape the waveform into a set waveform, it was found that a simple structure attachment could be installed on the conventional asphalt finisher to solve the problem. It has now come to completion.

<Means for solving the problem> In this invention, rollers for rolling on the upper surface of the formwork formed into a predetermined wave shape are arranged in a vertical plane passing through the pivot point of the leveling arm and the screed. In order to achieve this, a box-shaped member with a through hole in the bottom plate is attached to both sides of the screed so that the bottom surface is flush with the bottom surface of the screed, and the roller is provided in the through hole so as to be rotatable, and the roller is inserted through the through hole. The lower protrusion length can be adjusted.

<Example> In the asphalt finisher shown in FIG. 1, 1 is a leveling arm that is rotatable around a pivot joint 1a, and 2 is a leveling arm that is rotatable around a pivot joint 2a on the lower surface of the leveling arm 1. The screed 3 provided on the screed 2 is a thickness handle that allows the upward angle of the screed 2 to be adjusted. The asphalt finisher shown in FIG. 1 differs from conventional asphalt finishers in that attachments A are attached to both sides of the screed 2.

Details of attachment A are shown in Figure 2-A and Figure 2-
As shown in Figure B. That is, a bearing 8 having a bearing elevating means 7 is attached to a box-shaped member 6 in which a through hole 5 is bored in the bottom plate 4, a roller 9 is rotatably supported by the bearing 8, and a through hole is formed by the bearing elevating means 7. 5
The lower protrusion length L of the roller that can protrude from the roller can be adjusted to an appropriate length. This roller 9 is for rolling on the upper surface 10 of the formwork formed into a predetermined wave shape, and the protrusion length L determines the amount of excess rolling pressure.

When installing the attachments A on both sides of the screed 2, the bottom surfaces of the screed 2 and the box-shaped member 6 should be flush with each other (see Figure 2-A), and the pivot points 2a of the leveling arm 1 and the screed 2 should be aligned. The rollers are arranged so that the 9-axis axis of the rollers is located within the vertical plane passing through the rollers (see Fig. 3).

The formwork 11, which is laid underground on both sides of the paved area, has grooved steel 12 fixed to the sides of the formwork 11 properly placed in the foundation vault 13 so that the top surface of the formwork formed into a predetermined waveform serves as a firm reference. Install.

Next, we will discuss how to use this device. The trajectory of the portion of the screed 2 that intersects the vertical plane passing through the pivot point 2a of the leveling arm 1 and the screed 2 faithfully follows the waveform shape of the upper surface 10 of the formwork in contact with the roller 9. However, even if the portion of the screed 2 that intersects the vertical plane passing through the pivot point 2a is forcibly shaped into the set waveform, depending on the upward angle of the screed 2, the portion of the screed 2 that lies behind the screed 2 portion may It is conceivable to press it even harder and deform it. At this time, the screed 2 is pushed up by the resistance of the composite material, and as a result, the roller 9 rises from the top surface 10 of the formwork. If the roller 9 starts to float, operate the thickness handle 3 to reduce the upward angle of the screed 2, and as long as the roller 9 is always in contact with the upper surface 10 of the formwork. The desired corrugated asphalt pavement can be constructed.

<Effects of the invention> This invention not only makes it possible to construct corrugated asphalt pavement, which was previously impossible, by simply attaching Attachment A, which has an extremely simple structure, to an ordinary asphalt finisher, but also enables the construction of corrugated asphalt pavement, which was previously impossible. Since the roller 9 in contact with the upper surface 10 has a very small contact area, it not only allows faithful tracing but also does not kill the vibration of the screed 2, and is therefore extremely effective in obtaining good paving density. There is. Further, since the roller lower protrusion length L is adjustable, the amount of surplus can be set as desired depending on the construction conditions.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an asphalt finisher equipped with the screed attachment device of this invention, and Figs. 2-A and 2-B are detailed views of the attachment shown in Fig. 1, in longitudinal section. Figure and side view. FIG. 3 is an explanatory diagram showing the main parts. 1...Leveling arm, 2...Screed,
3... Thickness handle, 4... Bottom plate, 5...
Through hole, 6... Box-shaped member, 7... Bearing lifting means, 8
...Bearing, 9...Roller, 10...Top surface of formwork.

Claims (1)

[Scope of utility model registration request] In an asphalt finisher in which a screed 2 is rotatably mounted on the lower surface of a leveling arm 1 and the upward angle of the screed 2 is adjustable by a thickness handle 3, a box in which a through hole 5 is bored in a bottom plate 4. A bearing 8 having a bearing elevating means 7 is attached to the mold member 6, and a roller 9 for rolling on the upper surface 10 of the mold formed in a predetermined waveform shape is supported by the bearing 8 so that the roller can protrude from the through hole 5. The lower protrusion length L is adjustable, the bottom surfaces of the screed 2 and the box-shaped member 6 are flush with each other, and the axis of the roller 9 is arranged in a vertical plane passing through the pivot points of the leveling arm 1 and the screed 2. A screed attachment device for an asphalt finisher, in which the box-shaped members 6 are attached to both sides of the screed 2.