JP2002061110A - Asphalt two-layer spreading method and two-layer spreading device - Google Patents

Abstract

(57) [Summary] [Problem] Asphalt 2 using two leveling machines
In layer simultaneous pavement, the operation rate of the conventional leveling machine is improved, and a high quality pavement surface is formed with minimum capital investment. SOLUTION: A hopper device for storing and discharging the pavement material inputted from a hopper receiving port, and a screed disposed behind the hopper device and leveling the pavement material discharged on a construction surface,
An asphalt pavement method comprising arranging two independent leveling machines having at least two in the front and rear directions in the construction direction, wherein one of the leveling machines 10 is provided with a conveyor device 20 that extends to a hopper port of the two leveling machines. Provided, the conveyor device 20
Is selectively switched, and the first paving material 3 ′ is put into the hopper port 42 of the one leveling machine 10,
The lower layer 3 and the upper layer 4 are spread at the same time by charging the second pavement material 4 ′ into the conveyor device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying paving material such as asphalt mixture on a construction surface, and an apparatus used for carrying out the method. The present invention relates to a two-layer asphalt flattening method, a two-layer spreading device, and a conveyor-equipped spreading device used in the two-layer spreading device, in which the upper layer is spread immediately after the lower layer is spread.

[0002]

2. Description of the Related Art A conventional leveling machine (ie, a finisher) used in leveling work of asphalt pavement is a self-propelled vehicle equipped with a hopper device, a screw spreader, and a screed. Yes, it is configured to form a pavement surface from the rear of the vehicle as it moves on a construction surface such as a road surface.

That is, a paving material is supplied into a hopper from a dump truck disposed in front of the finisher, and the paving material is discharged onto a construction surface such as a road surface via a bar feeder. The laying work is performed by a process of transporting the pavement material in the direction and spreading the paving material spread on the construction surface with a screed.

[0004] On the other hand, asphalt pavement, two types of pavement materials are superimposed and spread in layers for the purpose of improving road surface properties such as drainage and soundproofing properties, and compaction of thick pavement is improved. For the purpose, there is a technique in which the same layer is divided into upper and lower portions twice and spread. In this two-layered asphalt pavement, in order to improve the bondability between the upper layer and the lower layer, or to prevent dragging of aggregates and the like in the upper layer pavement material in the thin two-layer pavement, it is not heated at a high temperature. It is necessary to spread the upper layer on the lower layer in the cured state.

[0005] For this reason, it is important to spread the upper layer immediately after the lower layer is spread (hereinafter referred to as "two-layer simultaneous pavement"). There are a method using a dedicated leveling machine and a method using two conventional leveling machines.

[0006]

When using two conventional leveling machines, it is necessary to arrange the upper leveling machine immediately after the lower leveling machine. If there is no such as a dump truck that supplies the paving material to the placed leveling machine or a side road that can run the feeder in parallel, the paving material is attached to the rear leveling machine (that is, the upper leveling machine). However, there is a disadvantage that a long transport device capable of supplying the wastewater must be provided in a dump truck or the like.

[0007] If a leveling machine dedicated to two-layer simultaneous paving is used, such inconvenience does not occur, but a dedicated leveling machine for two-layer simultaneous pavement is less frequently used than a conventional leveling machine. Significant costs are required for implementation. Therefore, the present invention improves the operation rate of a conventional leveling machine in two-layer asphalt simultaneous pavement using two leveling machines, and achieves a high-quality two-layered asphalt with minimum capital investment. An object of the present invention is to provide a two-layer asphalt spreading method capable of realizing pavement, and an apparatus and a machine used for implementing the method.

[0008]

According to a first aspect of the present invention, there is provided a method for leveling two layers of asphalt, comprising: a hopper device for storing and discharging a pavement material input from a hopper receiving port; And a screed for leveling the pavement material discharged on the surface. An asphalt pavement method in which at least two independent leveling machines having at least two independent leveling machines are arranged before and after the construction direction. Is provided with a conveyor device extending to a hopper receiving port of the two flattening machines, selectively switching a conveying direction of the conveyor device, throwing a first pavement material into a hopper receiving port of the one flattening machine, The lower layer and the upper layer are simultaneously spread by feeding the second paving material to the lower layer.

According to a second aspect of the present invention, there is provided a two-layer leveling apparatus for asphalt, which is disposed behind a first hopper device for storing and discharging a first pavement material input from a hopper receiving port, A first screed for leveling the first pavement material discharged on a construction surface, one end of which is located above a hopper receptacle of the first hopper device, and the other end of which is located behind the first screed. And a second hopper device that stores and discharges a second pavement material input from a hopper receiving port, comprising: A second screed disposed behind the second hopper device and leveling the second pavement material discharged on a construction surface;
A second leveling machine arranged so that the destination of the conveyor device is located above the hopper receiving port of the hopper device.

[0010]

The asphalt leveling method according to the first aspect of the present invention is performed by an apparatus configured by arranging two leveling machines one behind the other. On the other hand, for example, a leveling machine arranged in the front is provided with a conveyor device, and the destination of the conveyor device extends to the hopper port of the leveling machine. From a feeder arranged in front of the leveling machine, lower and upper layer paving materials are supplied to hopper devices of the respective leveling machines, and as the two leveling machines progress, a two-layer structure is formed from the rear. The paved surface is formed.

[0011] The pavement material is supplied to each leveling device so that, when the lower level pavement material is supplied, the first pavement material is supplied to a hopper receiving port of a leveling machine arranged in front. When supplying the pavement material for the upper layer, the transport direction of the conveyor device is selectively switched so that the second pavement material is supplied to the hopper port of the leveling machine arranged rearward. As described above, by attaching the conveyor device to the leveling machine arranged in front, it becomes possible to transport the pavement material from the front thereof, over the leveling machine and to the rear leveling machine. Accordingly, even when there is no side road or the like that can run in parallel such as a feeder, the pavement material for the upper layer can be supplied.

Also, since the other leveling machine is arranged immediately after one leveling machine, the upper layer is spread on the lower surface at a high temperature and uncured immediately after the lower layer is leveled. And the bonding between the lower layer and the upper layer is improved. Further, when the upper layer is pressed, the lower layer is pressed again, so that the compaction property is improved and the interlayer bonding property is further improved. or,
During the leveling work of the upper layer, the aggregate protruding from the pavement surface can be pushed down to the lower layer, so even if the upper layer pavement thickness is thin, the aggregate does not drag and high quality asphalt pavement Becomes possible.

[0013] One leveling machine can be manufactured by attaching a conveyor to a conventional leveling machine, and the other leveling apparatus is a conventional leveling apparatus itself. Layer pavement is possible. or,
Since the two-layer flattening machine can be used alone as a single-layer flattening apparatus, it is possible to improve the operation rate of the owned flattening machine.

[0014] When a conveyor device is mounted on the spreading machine arranged rearward, the paving material is conveyed from the rear spreading machine to the front spreading machine. Is done. Further, the conveyor device may be one in which the conveying direction is linear and reversible. In this case, when supplying the upper layer pavement material, the pavement material is transported rearward, and when supplying the lower layer pavement material, the pavement material is transported forward. According to this method, as long as the conveying direction of the conveyor device is switched to the direction of the leveling machine to be supplied, any pavement material can be put into the target hopper simply by being put on the conveyor device. Supplied.

[0015] With this, one feeder can supply both the upper and lower layers of the paving material, and the equipment cost and labor cost can be reduced. In particular, in the case where the same pavement material is spread two times, the advantage of being able to be supplied by one feeder is great. The two-layer asphalt spreading apparatus according to the second aspect enables the two-layer spreading method according to the first aspect, and has the same effect as each method.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A two-layer asphalt spreading method according to a first embodiment of the present invention relates to a two-layer asphalt pavement spreading step shown in FIG. This is executed by the device 1 moving on the roadbed 2 in the direction A in the figure. The asphalt two-layer leveling apparatus 1 is composed of two leveling machines (namely, finishers), and a first leveling machine 10 disposed in front is a finisher for leveling the lower layer 3, and is a conventional type. This is a machine in which a belt conveyor 20 as a conveyor device is attached to a finisher (a leveling machine with a conveyor). The second leveling machine 100 arranged rearward is for leveling the upper layer 4 and is a conventional finisher itself.

That is, the first leveling machine 10 includes a power unit (not shown), a power transmission unit (not shown),
1. A self-propelled machine having a steering device 12 and the like,
The hopper device 4 is provided on the vehicle body 30 from front to back.
0, a spreader 50 and a screed 60 are mounted in this order, and the belt conveyor 20 is mounted above the vehicle body.

The hopper 41 of the hopper device 40 has a receiving port 42 at the top and an opening at the center in the left-right direction from the bottom to the rear side. A bar feeder 43 extends from an opening at the bottom of the hopper 41 so as to pass through an opening at the rear side surface. The hopper device 40 includes the hopper 4
The lower layer pavement material 3 ′ as the first pavement material input from the first receiving port 42 is stored and transported by a predetermined amount by the bar feeder 43 at the bottom of the hopper 41. , On the roadbed 2. Note that the hopper 41 desirably has a capacity capable of storing approximately one paving material for a dump truck.
The hopper device 40 may be configured to directly discharge the pavement material onto the roadbed 2 without passing through the bar feeder 43.

The spreader 50 has a screw shape in which a main shaft extends in the traveling left and right direction and blades are screwed in opposite directions from the center to the respective directions. The spreader 50 discharges the pavement material 3 ′ discharged on the roadbed 2 in both the left and right directions. It is configured to carry. If the hopper 41 or the bar feeder 43 is configured to discharge the pavement material 3 'over the entire working width, the spreader 50 is not necessarily required.

The screed 60 located at the rear end of the first leveling machine 10 is pulled by a pair of left and right leveling arms 61 extending rearward from the center of the vehicle body, and removes the pavement material 3 ′ on the roadbed 2. The screed position is adjusted so that a constant pavement thickness W is maintained, and the screed is pressed by the load. The screed position is adjusted via the leveling arm 61 as follows.

When the vehicle body 30 tilts or moves up and down, the vehicle height fluctuation is sensed by a sensor, a pivot or the like, and the piston of the cylinder device 31 is expanded or contracted in accordance with the degree of the vehicle height fluctuation. Due to the expansion and contraction of the piston, the position of each leveling arm 61 moves up and down or back and forth. As described above, by adjusting the traction force of each leveling arm 61 to the screed 60, the height and the horizontality of the screed 60 from the roadbed 2 are maintained within a predetermined range, and the pavement thickness W can be made constant. .

The belt conveyor 20 is mounted such that one end of the belt portion 21 is located above the hopper receiving port 42 and the other end is located behind the screed 60. The belt conveyor 20 may be detachable, and the belt moves in the direction B in the figure. Second flooring machine 10
Reference numeral 0 denotes a conventional finisher, and the first flattening machine 1
This is a configuration in which the belt conveyor 20 is detached from the belt conveyor 0. The other end of the belt portion 21 of the belt conveyor 20 of the first leveling machine is arranged so as to be located above the hopper receiving port 142 thereof. The hopper device 140 includes a hopper 141
Inside, a pavement material 4 ′ for an upper layer as a second pavement material is stored, and the pavement material 4 ′ is discharged onto a construction surface via a bar feeder 143.

A method for leveling asphalt using the two-layer leveling apparatus 1 in asphalt pavement will be described below. First, a pavement material made of asphalt mixture is supplied to the first and second leveling machines 10 and 100 by a loading feeder 5 arranged in front of the first leveling machine 10, but a pavement material for a lower layer is supplied. When supplying 3 ′, the loading feeder 5 is directly loaded into the hopper 41 with the rear end of the loading feeder 5 positioned above the hopper receiving port 42 of the first leveling machine. When supplying the upper layer pavement material 4 ′, the rear end of the loading feeder 5 is positioned above the belt conveyor 20 and put on the belt.
The pavement material 4 ′ put on the belt is conveyed rearward by the movement of the belt, and is put into the hopper port 141 of the second leveling machine 100 at the rear end of the upper belt portion 21. The paving materials 3 ', 4' stored in the hoppers 41, 141 of both spreading machines are spread by the respective spreading machines 10, 100 in the following flow.

That is, the hopper receiving port 4 of the first leveling machine 10
The pavement material 3 ′ for the lower layer put in 1 is a bar feeder 4.
3 and is discharged onto the roadbed 2. The pavement material 3 ′ discharged onto the roadbed 2 is spread by the spreader 50. By flattening the spread paving material 3 ′ with the screed 60, the lower layer 3 is formed from behind as the first spreading machine 10 moves.

The upper layer 4 is formed by a second leveling machine 100 following immediately after the first leveling machine 10. That is, the paving material 4 ′ for the upper layer transported by the belt conveyor 20 of the first leveling machine 10 and charged into the hopper 141 of the second leveling machine is supplied onto the lower layer 3 via the bar feeder 143. , Spread by spreader 150,
Leveled by screed 160. Then, by rolling over the spread upper layer 4 with a roller or the like,
The upper and lower two layers are compacted to complete a two-layer asphalt pavement.

When the upper layer 4 is spread, the lower layer 3 has just been spread and is in an uncured state at a high temperature, so that the interlayer bonding property is good. Further, when the upper layer 4 is pressed, the lower layer 3 is pressed again by the screed 160, so that the compaction property is also good. Further, even if a large aggregate is mixed in the paving material 4 ′ of the upper layer 4, the aggregate is pushed down to the lower layer 3 by the pressing by the screed 160, so that the surface of the upper layer 4 There will be no occurrence of protruding material, and high quality pavement can be achieved.

Particularly, in the case of a thin-layer pavement, the pavement surface is damaged by dragging of the aggregate, the temperature of the pavement material is remarkably reduced, so that the interlayer bonding is poor, and sufficient density cannot be obtained even by rolling. However, the second leveling machine 100 is disposed immediately after the first leveling machine 10 and the lower layer 3
Since the upper layer 4 is spread immediately after the lower layer is spread, it is possible to spread the upper layer on the lower layer at a high temperature and in an uncured state.

The paving material 4 ′ for the upper layer is transferred from the loading feeder 5 in front of the first leveling machine 10 onto the first leveling machine 10 by a conveyor device provided in the first leveling machine. Because it was passed through and supplied to the second leveling machine 100,
There is no need to run a feeder or the like for loading the upper layer paving material 4 'on the side road or the like. Thereby, even in a place where there is no space such as a side road, it is possible to simultaneously pave two layers using two leveling machines. Also, the loading feeder itself for the upper layer pavement material 4 'or the operator who operates it is not required, and the cost can be reduced.

Further, since the first leveling machine can be constructed by attaching the belt conveyor 20 to an existing leveling machine, a two-layer leveling apparatus can be manufactured with minimum capital investment. In addition, with this two-layer leveling device, it is not necessary to introduce a dedicated machine for simultaneous two-layer pavement, which is infrequently used, and each leveling machine can be used independently as a one-layer leveling device. Therefore, it is possible to improve the operation rate of the own leveling machine.

In the present embodiment, the upper layer paving material 3 'and the lower layer paving material 4' can be made of the same material. For example, in the case of a thick pavement having a pave width of about 10 to 30 cm, components in the pavement material are unbalanced between the upper layer and the lower layer, and there are inconveniences such as low compactibility at the lower layer. Such inconvenience can be solved by laying out two times (that is, laying out the upper layer and the lower layer with the same paving material).

Further, the upper layer and the lower layer of the pavement material may be simultaneously supplied by the two feeders, thereby improving the working efficiency. Furthermore, the conveyor device formed on the conveyor-equipped leveling machine (first leveling machine) is a two-belt conveyor, and the conveyor destination of each belt conveyor is located at the hopper receptacle of both leveling machines. It may be something that can be done. In this case, by selectively using both belt conveyors, it is possible to selectively switch the transport direction.

The spreading method according to the second embodiment of the present invention shown in FIG. 3 uses the first method in which the conveying direction of the belt conveyor is reversible.
This is performed using a leveling apparatus 1 'including a leveling machine 10' and a second leveling machine 100 'which is a conventional finisher. The first leveling machine 10 'is provided with a switch for switching the moving direction of the belt of the belt conveyor 20', and moves the belt in the reverse direction (that is, the direction C in the figure).
This is different from the spreading device of the first embodiment in that it can be moved to

A method for leveling asphalt using the leveling apparatus 1 'will be described. First, the first leveling machine 1
The lower and upper paving materials 3 'and 4' are supplied to each leveling machine by a loading feeder 5 'arranged in front of 0'. At this time, the lower paving material 3 'is supplied. When you do
The pavement material 4 ′ for the upper layer is put on the belt of the belt conveyor 20 ′ in the same manner as in the case of supplying the pavement material 4 ′ for the upper layer. That is, when supplying the paving material 4 ′ for the upper layer to the second leveling machine, the pavement material 4 ′ is moved in the forward direction (ie,
It is loaded on the belt moving in the direction (B direction in the figure), but when supplying the lower layer pavement material 3 ′, the moving direction of the belt is switched and the pavement material is fed on the belt moving in the opposite direction. The lower layer pavement material 3 'put on the belt is conveyed forward, and at the front end, the hopper receiving port 42' of the first leveling machine 10 '.
It is thrown into. The pavement materials stored in the respective hoppers 41 'and 141' are spread by the respective spreading machines 10 'and 100' in the same manner as in the first embodiment.

According to the present embodiment, both upper and lower paving materials can be supplied by a series of loading feeders.
It is particularly convenient when the upper layer and the lower layer are paved with the same material.

[Brief description of the drawings]

FIG. 1 is a schematic process diagram illustrating a two-layer asphalt spreading method according to a first embodiment of the present invention.

FIG. 2 is a front view showing a two-layer leveling apparatus for performing the two-layer leveling method, and a conveyor-equipped leveling machine used in the two-layer leveling apparatus.

FIG. 3 is a schematic process diagram showing a two-layer asphalt spreading method according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Asphalt two-layer leveling apparatus 2 ... Subgrade (construction surface) 3 ... Lower layer (construction surface) 3 '... Pavement material (1st pavement material) 4 ... Upper layer 4' ... Pavement material (2nd pavement material) 10, 10 '... first leveling machine 20, 20' ... belt conveyor (conveyor device) 40, 40 '... hopper device 42, 42' ... hopper receiving port 60 ... screed

Claims (2)

[Claims] 1. A hopper device for storing and discharging pavement material input from a hopper receiving port, and a screed disposed behind the hopper device and leveling the pavement material discharged on a construction surface.
An asphalt pavement method for arranging two independent leveling machines having at least two in the front and rear direction in the construction direction, wherein one of the leveling machines is provided with a conveyor device extending to a hopper receiving port of the both leveling machines. Selectively switching the conveying direction of the conveyor device, charging the first paving material into the hopper receiving port of the one leveling machine, and charging the second paving material into the conveyor device, thereby forming the lower layer and the upper layer. And two layers of asphalt at the same time. 2. A first hopper device for storing and discharging a first pavement material input from a hopper receiving port, and the first pavement disposed behind the first hopper device and discharged on a construction surface. A first screed for leveling the material, and one end positioned above the hopper receptacle of the first hopper device, and the other end linearly attached so as to be positioned behind the first screed, and directed from front to back. Conveyor device that can be transported
A first leveling machine having: a second hopper device that stores and discharges a second pavement material input from a hopper receiving port; and a second hopper device that is disposed behind the second hopper device and is discharged onto a construction surface. A second screed for leveling a second pavement material, and a second leveling machine disposed so that a destination of the conveyor device is located above a hopper receiving port of the second hopper device. An asphalt two-layer spreading apparatus comprising: