JPH07166512A - Double-layer compacting mechanism - Google Patents

Abstract

PURPOSE:To evenly compact paving materials even in a thick paving slab thereof. CONSTITUTION:Concrete K supplied on a subbase course is compacted by a lower stage compactor 5 to get a constant thickness to form a lower layer S1. Concrete K supplied thereon is compacted by a succeeding screed 6 and unified with the prior compacted concrete K (lower layer S1). In this way, compaction at the lower layer of a paving slab 8 is improved and concrete from the upper layer to the lower layer is almost evenly compacted in the thickness direction of paving slate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-layer compaction mechanism for leveling paving materials.

[0002]

2. Description of the Related Art For example, when paving a roadbed surface such as a road with an asphalt finisher, while supplying asphalt (paving material) onto the roadbed from a supply unit such as a screw spreader, a screed provided behind the supply unit. The asphalt supplied on the roadbed is compacted.

[0003]

However, in the above case, when the plate thickness of the pavement plate becomes thicker, the lower layer portion of the pavement plate becomes insufficiently compacted as compared with the upper layer portion, and it is rolled by a roller or the like. However, there is a problem that the compaction is not uniform in the plate thickness direction. The present invention has been made in view of the above circumstances, and an object thereof is to provide a two-layer compaction mechanism capable of uniformly compacting a paving material even when the paving plate has a large thickness.

[0004]

In order to achieve the above object, a two-layer compaction mechanism of the present invention comprises a lower layer compaction device for compacting a pavement material supplied to a roadbed surface to a constant thickness. A screed provided on the upper rear side of the compacting device and compacting the pavement material supplied onto the lower layer portion compacted by the compacting device to a target thickness.

[0005]

In the present invention, the pavement material supplied onto the roadbed is compacted to a constant thickness by the low layer compaction device to form the low layer portion, and the pavement material supplied onto the pavement material is As it is integrated with the pavement material (lower layer part) that has been compacted by the subsequent screed and is compacted earlier, the compaction of the lower layer of the paving slab is improved and it is compacted almost uniformly in the plate thickness direction from the upper layer to the lower layer. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an embodiment of a two-layer compaction mechanism according to the present invention, in which reference numeral 1 is an asphalt finisher. In this asphalt finisher 1, the super-mixed concrete (pavement material) carried by a dump truck is put into a hopper 2, is carried backward by a bar feeder (not shown), and is spread evenly to a required construction width by a screw spreader 3. It is supposed to be done.

Further, behind the screw spreader 3, there is provided a lower layer compaction device 5 for compacting the pavement material supplied to the roadbed 4 by the screw spreader 3 to a constant thickness. This lower layer compaction device 5
A steel plate 5a provided in parallel with the roadbed surface 4 for compacting concrete, a vibrator 5b stacked on the upper surface of the steel plate 5a for vibrating the steel plate 5a, and a cover 5c for covering the upper side thereof are mainly included. And is set in a position floating above the roadbed surface 4 in the concrete K that has been cast by the screw spreader 3.

On the rear upper side of the lower layer compaction device 5,
The screed 6 is provided so as to be supported by the support arm 7. The screed 6 is provided with a damper bar and a vibrator, and is adapted to compact the pavement material supplied onto the lower layer portion compacted by the lower layer compaction device 5 to a target thickness.

Next, a method of compacting the pavement material by the two-layer compaction mechanism having the above construction will be described. First, while advancing the asphalt finisher 1, the concrete put into the hopper 2 is evenly spread to the required construction width by the screw spreader 3. Then, a part of the spread concrete K is compacted by the steel plate 5a of the low layer compaction device 5 to form the low layer portion S ₁ having a thickness of about 10 cm.

On the other hand, the remainder of the concrete cast by the screw spreader 3 is covered by the cover 5 of the lower layer compaction device 5 as the asphalt finisher 1 moves forward.
After passing through c, it is supplied onto the lower layer portion S ₁ .

Then, the concrete supplied onto the lower layer portion S ₁ is compacted by the screed 6 to a target thickness, and is integrated with the previously compacted concrete (the lower layer portion S ₁ ) to form the paving slab 8. To do.

By forming the paving slab 8 in this way,
Even if the plate thickness becomes thicker, the compaction of the lower layer of the paving slab 8 is improved, and the compaction is almost uniform in the plate thickness direction from the upper layer to the lower layer and the compaction degree is close to 100% (filling rate 96%). it can. Further, the two-layer compaction mechanism, and the lower floors compaction device 5 compacting the low rise portion S _1, provided in the rear upper side of the lower floors compaction device 5, concrete K supplied on lower floors S ₁ The concrete K supplied to the roadbed 4 can be easily and surely divided into two layers and compacted.

[0013]

As described above, according to the two-layer compaction mechanism of the present invention, the low-layer compaction device for compacting the pavement material supplied to the roadbed surface to a constant thickness and the rear upper part thereof. Since it is provided with the screed that compacts the pavement material supplied onto the low-layer portion compacted by the low-layer portion compacting device to a target thickness, the concrete supplied to the roadbed surface can be easily and reliably formed. It can be compacted in two layers. Therefore, even if the plate thickness of the paving slab becomes thicker, the compaction of the lower layer of the paving slab is improved, and the compaction degree is almost uniform in the plate thickness direction from the upper layer to the lower layer and the compaction degree is close to 100% (filling rate 96%) Can be hardened.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a two-layer compaction mechanism of the present invention.

FIG. 2 is an enlarged view of the lower layer compaction device in FIG.

FIG. 3 is a view on arrow A in FIG.

[Explanation of symbols]

1 Asphalt Finisher 2 Hopper 3 Screw spreader 4 Roadbed 5 Roadside compaction device 5a Steel plate 5b Vibrator 5c Cover 6 Screed 7 Support arm 8 Pavement plate K Concrete (pavement material) S ₁ Low layer part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichi Mochimaru 7-1 Hattomichi, Matsudo City, Chiba Prefecture, Kanto Engineering Office, Ministry of Construction (72) Inventor, Yuki Yamanaka, Asahi Ichiba, Tsukuba City, Ibaraki Prefectural Institute of Civil Engineering Research

Claims (1)

[Claims] 1. A low-layer compactor for compacting a pavement material supplied to a roadbed surface to a constant thickness, and a low-layer compactor provided on the rear upper side of the low-layer compactor. A two-layer compaction mechanism comprising: a screed that compacts the pavement material supplied onto the compacted low-layer portion to a target thickness.