JPH01210506A - Finisher for asphalt - Google Patents

Abstract

PURPOSE:To enable pavement construction along a pavement boundary surface having an angle in the direction of pavement by fixing an expanding and contracting arm to the rear section of an asphalt finisher and rotatably installing a screed at the nose of the arm. CONSTITUTION:Screed arms 6R, 6L expanded and contracted by hydraulic cylinders 8R, 8L are fastened to the rear section of an asphalt finisher while arcuate guide members 10R, 10L, internal side faces of which have guide grooves 11R, 11L and internal gears 12R, 12L, are mounted respectively at the noses of the arms. Screed holding struts 14R, 14L disposed in upright on the top face of a screed 5 are coupled with the arms 6, and the screed 5 can be rolled by a motor set up to the upper sections of the struts 14R, 14L.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an asphalt finisher equipped with a screed that can effectively compact even the corners of a paved surface and finish the surface.

[Conventional technology]

In asphalt paving work, an asphalt finisher is used to efficiently perform the paving work. This asphalt finisher is a machine that consistently spreads asphalt mixture on the base surface to a specified paving width, then spreads it to a specified thickness and compacts it. A hopper that receives the composite material, a feeder that sends the composite material backwards, a spreader that spreads the composite material evenly over the width of the pavement, a screed that compacts the composite material and smoothes the surface at the same time, a power transmission device and a traveling device as other incidental equipment, etc. It is composed of. In general, the spreader and screed, particularly the screed that performs the final surface finishing, are usually installed perpendicular to the running direction of the finisher. Therefore, for example, when constructing an asphalt surface impermeable wall type dam where the surface of the dam is paved with asphalt to make it impermeable, there will be corners on both sides, but the surface finish of the corners on both sides will be It cannot be constructed using an asphalt finisher. That is, since dams are usually built in mountain valleys, corners are formed along the boundaries on both sides. More specifically, as shown in Figure 4, the boundary line E between the cut-off concrete surface C9C of the left and right peaks B and B and the dam slope base surface,
Since E is a linear line having a certain angle with respect to the dam axis F, the asphalt finisher traveling in the direction of the arrow G forms a corner portion (the shaded area in FIG. 4) which the screed of the asphalt finisher does not reach. A similar situation can be seen in the case of paving roads that have a longitudinal direction that is not orthogonal to structures such as bridges or box culverts. For example, as shown in Figure 5, if a bridge I is constructed that crosses a river H diagonally, and a road J continues in the same direction as the bridge ■, the road J and the road J will be connected on both sides of the bridge I. A corner portion (shaded area in FIG. 5) is formed along the boundary line. Currently, it is necessary to perform manual construction again at such corners. Specifically, asphalt mixture is discharged from an asphalt finisher placed near the corner, and the asphalt mixture is removed. The method used is for workers to quickly spread the ground before it cools down and use Bosch tampers and Vibro plates to compact it.

[Problem to be solved by the invention]

However, such corners are along the boundary line between other structures and the asphalt pavement base, and are prone to distortion, so during construction, it is necessary to work quickly and evenly before the temperature of the asphalt mixture drops. process, and usually requires several skilled workers. In particular, in the case of asphalt paving of the above-mentioned surface impermeable wall type dam, this corner is located along the boundary line where the cut-off concrete surface changes sharply from the asphalt pavement surface, and it is considered to be the most important part of the impermeable wall. It is a place where large stress and water pressure are applied, making it easy for distortion to occur, and there are also problems such as variations in the vacuum water permeability test after construction, which may require rework. Furthermore, in this case, the work will be on a slope, and since there are various machines at the top, safety management for workers is important.

That is, when the asphalt pavement boundary line has a certain angle with respect to the asphalt paving direction, in the conventional asphalt finisher in which the screed is fixed perpendicular to the direction of travel, a corner portion is formed where mechanical construction is left behind. These corners are constructed manually, but compared to general parts constructed by machines, the quality of the paved surface is often a problem (and there are also problems with economy and safety).

Therefore, an object of the present invention is to improve the quality of pavement with regard to asphalt pavement work at corners that are formed near the pavement boundary line at an angle to the asphalt paving direction and which cannot be reached by the screed of a conventional asphalt finisher. The objective is to reduce the number of workers and improve the economic efficiency and safety of the work.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an asphalt finisher equipped with a spreader and a screed, in which the screed can be adjusted at any angle with respect to the running direction of the asphalt finisher. Preferably, the asphalt finisher is such that the screed angle can be adjusted via a rotating mechanism built into the screed arm, and the screed arm of the asphalt finisher is preferably extendable and retractable.

[Effect]

The screed is placed above the asphalt mixture spread at the paving site, and the screed is rotated relative to the screed arm to set it at a predetermined angle.The height position of the screed is also adjusted and adjusted in the same way as before. By setting and moving the asphalt finisher, you can mechanically pave asphalt even in corners.

Furthermore, since the screed rotation mechanism is incorporated into the screed arm, it is compact and has little interference with other equipment. Furthermore, when the screed arm is extended during asphalt paving, the screed moves backward, increasing the range of rotation of the screed and allowing it to rotate without worrying about contact with vehicle body equipment such as a spreader.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view of an asphalt finisher according to the present invention, FIG. 2 is an enlarged perspective view of the main parts of the asphalt finisher of FIG.
It is an enlarged sectional view along -m line.

As shown in FIG. 1, the asphalt finisher 1 of the embodiment is a crawler traveling machine equipped with a paving device consisting of a hopper 2, a bar feeder 3, a screw spreader 4, and a screed 5, and in particular is held by screed arms 6R and 6L. The screed 5 is provided with means that enable the screed 5 to be adjusted in its longitudinal position, rotated, and raised and lowered.

In FIGS. 2 and 3, screed arms 6R, 6
L is made of two parallel steel rods, most of which are made of rigid steel hollow holding tube 7R.

7L, and the same hollow holding tube 7R,? Along with L, it is fixedly held on the vehicle body side and extends rearward. The screed arms 6R and 6L are each located at an intermediate location and are divided into a front portion 6a and a rear portion 6b, and at the divided portion, the rear portion 6b is connected to the front portion 6a by hydraulic cylinders 8R and 8L as expansion and contraction means. The rear portion 6b is firmly held by the hollow holding tubes 7R and 7L into which the divided portions are fitted. That is, in this state, the hydraulic cylinders 8R,
If you activate 8L, screed arm 6R.

The rear part 6b of 6L slides inside the hollow holding tubes 7R and 7L to move forward or backward. That is, cylinder arms 6R, 6
L performs expansion and contraction movements. In addition, screed arms 6R, 6
The rear end portion of L is removed from the hollow holding tubes 7R and 7L and is exposed, and the bolts are attached to the same portion using member 9.
The guide members 10R and 10L are fixedly held via R and 9L.

The guide members 10R and IOL have an arcuate shape, and are welded to the members 9R and 9L, respectively, so that the opening sides of the guide members 10R and IOL are inward and horizontally, that is, they are left and right opposite to each other. Guide member 1
0R, IOL has a T-shaped guide groove 11R, II on the inner surface.
L is formed, and internal gears 13R and 13L are fixed to the lower surfaces of the guide members 10R and IOL, forming an arc concentric with the guide members 10R and 10L, and having internal teeth 12R and 12L on the inner side. . And this guide member 10R110L
A pair of screed holding columns 14R, 14L are arranged so as to be engaged with the guide grooves 11R, ILL and the internal gear 13R21°3L.

The screed holding columns 14R and 14L are square column main bodies 1.
5R and 15L are fitted into hollow square column outer tubes 16R and 16L, and a pulley 18R is attached to the upper side of the column outer tube 16R116L via a welded bracket 17R217L.
, 18L are attached, and the pulleys 18R, 18L are fitted into the guide grooves 1IR211L of the guide members 10R, 10L from the ends, so that they can be moved within the guide grooves 11R, IIL, and the same pillar outer tubes 16R, 16L are installed. The hydraulic motor 2 is attached to the plackets 19R and 19L welded to the lower part of the same side of the
Attach OR and 2OL, and install the same hydraulic motors 20R and 20L.
It is designed to mesh with external gears 13R and 13L attached to the motor shaft. Further, hydraulic motors 22R, 22L are attached to the upper parts of the outer strut tubes 16R, 16t, and threaded rods 23R, 23L are attached concentrically with the motor shafts, and threaded rods 231? , 23L are screwed onto the upper parts of the strut bodies 15R and 15L, and by driving the hydraulic motors 22R and 22L, the threaded rods 23R and 23L are rotated to rotate the strut bodies 15R and 15L with respect to the strut outer tube 16R816L. Screed arm 6R.

It can be raised and lowered slidingly with respect to the 6L level. Furthermore, a plate-shaped screed 5 is pivotally attached to the lower ends of the strut bodies 15R and 15L using bearings 24R and 24L so as to be rotatable about the screed holding struts 14R and 114L.

In the asphalt finisher 1 of the embodiment according to the present invention as described above, the asphalt finisher 1 is disposed above the corner near the paving boundary line having an angle in the paving direction, and the hydraulic cylinders 8R of the screed arms 6R, 6L
, 8L, the screed 5 is moved back to a position where there is no risk of contact with the screw spreader 4 even if the screed 5 is rotated, and the screed 5 is placed on top of the asphalt mixture that has been discharged from the asphalt finisher 1 and spread. Let it happen. Then, the screed holding columns 14R and 14L are moved horizontally in accordance with the movement of the pulleys 18R and 18L that are transferred within the guide grooves 11R and 11L, thereby moving the screed 5 along the arrow A.
Turn the screed 5 to align the trailing edge of the screed 5 with the paving boundary line. Then the screed holding columns 14R, 14
By operating the hydraulic motors 22R and 22L attached to the upper part of the screed 5, the screed 5 is lowered to a predetermined asphalt thickness by means of a screw-in lifting means inside the screed holding columns 14R and 14L, and a light oil burner (not shown) is used. By moving the car body while also using the screed heating mechanism, the screed 5 can pressurize the asphalt and perform compaction work.

Adjustment of the longitudinal position of the screed 5 by the expansion and contraction mechanism of the screed arms 6R and 6L is carried out in such a way that there is no hindrance to the rotation of the screed 5, that is, so that the screed 5 does not come into contact with vehicle body equipment such as a spreader located in front of it when rotating. However, the screed arms 6R and 6L can be extended as necessary and kept in a compact and contracted state at all times. Further, such a screed arm extension/contraction mechanism is extremely useful when the screed rotation mechanism according to the present invention is used by modifying a conventional asphalt finisher.

Screed holding column 14R in the illustrated embodiment.

Although 14L is a pair of left and right screed holding columns, it is also possible to use a combination of two left and right screed holding columns to hold the screed more firmly. In this case, for example, two pulleys are fitted into the guide groove of one guide member, and the bracket of the screed holding column that holds these pulleys is formed into an arc-shaped band between the two screed holding columns. so that

〔Effect of the invention〕

Since the present invention is structured as described above, it produces the following effects.

In the asphalt finisher according to claim 1, the screed is also applied to corners formed due to a paving boundary line having an angle in the paving direction, as in the case of surface paving of an asphalt surface impermeable wall type dam. Since the corners can be aligned, mechanical paving can be performed using an asphalt finisher at the same corner, and the same quality as the crotch section can be ensured. This eliminates the need for rework, which was often the case with conventional manual paving. Since manual paving is not required, there is no need for employees to do so, and overall economic efficiency and safety are improved accordingly.

In the asphalt finisher according to claims 2 and 3, the screed rotation mechanism is assembled to the screed arm, and the screed arm is made telescopic, so that the screed rotation mechanism has less interference with other equipment and is compactly assembled. Furthermore, since the front and back position of the screed can be easily adjusted, the rotation range of the screed is widened, and it is now possible to adjust to any angle of the asphalt pavement boundary line, and the conventional asphalt finisher can be modified. It also becomes easier to install the present screed rotation mechanism.

[Brief explanation of the drawing]

FIG. 1 is a side view of the asphalt finisher according to the present invention, FIG. 2 is an enlarged perspective view of the main part of the asphalt finisher of FIG.
An enlarged cross-sectional view along line 1, Figure 4 is an explanatory diagram of a conventional asphalt pavement surface in an asphalt surface impermeable wall type dam,
FIG. 5 is an explanatory diagram of a conventional asphalt pavement surface when a bridge crosses a river diagonally. 1... Asphalt finisher 2... Hopper 3... Bar feeder 4...
・Screw spreader 5...Screed 6R, 6L...Screed arm 7R, 7L...Hollow holding tube 8R, 8L...Hydraulic cylinder 10R, IOL...Guide member 13R, 13L...Internal gear 14R , 14L...Screed holding column 18R, 18
L...Pulley 20R, 20L...Hydraulic motor 21R, 21L...External gear 22R, 22L...Hydraulic motor 23R, 23L...Screw rod Fig. 1

Claims (3)

[Claims] (1) An asphalt finisher equipped with a spreader and a screed, characterized in that the screed is equipped so as to be freely adjustable to any inclination angle with respect to the running direction of the asphalt finisher. (2) The asphalt finisher according to claim 1, wherein the angle of the screed is adjustable via a rotation mechanism built into the screed arm. (3) The asphalt finisher according to claim 1 or 2, characterized in that the screed arm is extendable and retractable.