JP3028816U - Concrete finisher - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a concrete finisher that can be self-propelled without requiring rails, can be adjusted in construction width, and can obtain a uniform pavement surface even with special concrete such as steel fiber concrete. It is a problem to be solved. SOLUTION: This is a concrete finisher for running tires on a road surface, and a hopper (3) opened upward in the front part of the machine body, and pavement material put in the hopper to the front of the screw conveyor (4) at the rear side of the machine body. A transport mechanism for transporting, a first screed (6) provided at the rear of the screw conveyor and having a vibrator and a tamper, and a second screed provided at the rear of the first screed and also having a vibrator and a tamper (7), A cylindrical vibrating body (8) provided behind the second screed is provided, and the second screed is composed of two screeds that are movable in the machine width direction.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention mainly relates to a concrete finisher for leveling, compacting, and finishing hard concrete.

[0002]

[Prior art]

 Conventionally used concrete finishers have a drive unit and a vibrator on the main body frame, a fast screed at the front of this frame, and a finishing screed at the rear of the frame, and the wheels of the wheels connected to the traveling device are rolled. It is configured to move on the rail by movement.

[0003]

[Problems to be solved by the device]

 However, the conventional concrete finisher as described above has the following problems. That is, since it is a rail traveling type, it is necessary to install rails and suspend and unload concrete finishers with a crane at the time of construction, resulting in poor construction efficiency, especially in the case of split construction where regulations are only repeated at night. However, the above process had to be repeated every time the work was started, and the work efficiency was extremely poor. Moreover, it is difficult to install rails when the road width in the construction section is narrow, making it difficult to apply the conventional concrete finisher that is a rail traveling type. Also, since the workable width is constant, in a section where the road surface width changes from the middle, another concrete finisher having a span corresponding to the road surface width is carried in from the point where the road surface width changes and is re-loaded. Installation work had to be done. Although there are concrete finisher devices that can respond to changes in the road surface width by moving the two finishing screeds that are arranged substantially on the same line to the left and right respectively, in such devices, the left and right finishing devices are used. There was a problem that the road surface inside the screed bulges up like a bump, and this bulge remains on the finishing surface in the form of streaks.

Further, in recent years, as a reinforcing measure for the floor plate of an existing road bridge, the shear strength against the punching shear failure in the latter stage of the crack damage of the floor slab has been improved, and the rigidity of the bridge has been increased mainly by the integration of old and new concrete. The floor slab top surface thickening method has been attracting attention due to the fact that the fatigue strength of the girders is improved and the construction cost is lower than other methods (girder increase method, steel plate bonding method, etc.). In such floor slab top thickening method, steel fiber concrete is usually used.However, in this steel fiber concrete, three-dimensionally randomly oriented steel fibers are entangled in fresh concrete in a complicated manner and the conventional concrete is used. It was difficult to finish the surface uniformly with the finisher device. The present invention has been made in view of the above-mentioned conventional problems, and can be self-propelled without a rail and its construction width can be adjusted, and even concrete pavement such as steel fiber concrete can be uniformly paved. The purpose is to provide a concrete finisher that can obtain a surface.

[0005]

[Means for Solving the Problems]

 The present invention has been made in order to achieve the above object, and is a concrete finisher for running tires on a road surface, the hopper having an opening at the front of the machine body, and the pavement put in the hopper. A transport mechanism for transporting the material to the front of the screw conveyor at the rear of the machine body, a first screed provided at the rear of the screw conveyor with a vibrator and a tamper, and a vibrator and a tamper provided at the rear of the first screed. A second screed and a cylindrical vibrating body provided behind the second screed, wherein the second screed is composed of two screeds movable in the machine width direction. The above concrete problems are solved by the concrete finisher.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the concrete finisher according to the present invention will be described below with reference to the drawings. 1 is a side view showing a preferred embodiment of a concrete finisher according to the present invention, FIG. 2 is a partially cutaway front view thereof, FIG. 3 is a plan view thereof, FIG. 4 is a rear view thereof, and FIG. 5 is a screw conveyor. FIG. 6 is a front view of a main part, FIG. 6 is a cross-sectional view of the rear part of the concrete finisher machine body, FIG. 7 is a cross-sectional view of the second screed, and FIG. 8 is a schematic diagram showing the positional relationship between the first and second screeds and the cylindrical vibrating body. Is.

A concrete finisher (1) according to the present invention comprises a tire (2) for traveling on a road surface, a hopper (3) opened upward at a front part of the machine body, and a pavement material put into the hopper. A transport mechanism (5) for transporting to the front of the rear screw conveyor (4), a first screed (6) provided at the rear of the screw conveyor and provided with a vibrator and a tamper, and a vibrator and tamper provided at the rear of the first screed. The second screed (7) provided with and the cylindrical vibrating body (8) installed behind the second screed are provided.

The hopper (3) is opened upward in the front part of the machine body, and belt conveyors are provided on the left and right as a transfer mechanism (5) on the bottom surface, and the pavement material fed in is forward of the screw conveyor (4). It is designed to be transported to. The screw conveyor (4) spreads the paving material transferred from the hopper (3) by the transfer mechanism (5) on the road surface, and the rotary shaft (41) extending in the machine width direction as shown in FIG. A spiral blade (42) is provided on the shaft, the rotary shaft (41) is connected to the hydraulic motor (43) via a belt, and the hydraulic cylinder (44) is connected via the rods (45) and (46). And is connected to the rotating shaft (41). As a result, the screw conveyor (4) is rotated by the rotation of the hydraulic motor (43) and can be vertically moved up and down by the hydraulic cylinder (44).

The first screed (6) and the second screed (7) are provided with vibrators (61), (71) and tampers (62), (72), respectively. The tampers (62) and (72) are two plate-shaped tampers that are long in the width direction and are arranged side by side in the front-rear direction. These two tampers are the lower ends of the support rods (63) and (73). The support rods (63) and (73) are respectively coupled to the parts, and are attached so as to be offset by 180 ° with respect to the eccentric cams (66) and (76) rotated by the drive motors (64) and (74). . This allows the two tampers to alternate up and down. The vibrators (61), (71) have a conventionally known structure in which a rotatable eccentric weight is set in the case, and are fixed to the inclined surfaces (65), (75).

According to the first screed (6) and the second screed (7) thus configured, the concrete containing steel fibers spread by the screw conveyor (4) causes concrete to be in a liquid state due to vibration of the vibrator. The steel fibers, which have the property of being arranged and arranged along the vibrating surface, are arranged randomly along the screed. At this time, the steel fibers protruding from the surface do not hinder the progress of the airframe due to the inclined surfaces (65) and (75), and the entangled state is unraveled by the twin tampers that move up and down alternately, and the downwards. The bubbles located on the surface side are crushed or expelled to the outside by being forcibly pressed against, so that the surface layer is spread and leveled at a high density.

The second screed (7) is composed of a right screed (7a) and a left screed (7b), is supported by the variable support mechanism (73) on the airframe (9), and is respectively on the right side. And can be moved to the left. FIG. 7 is a cross-sectional view of the right screed (7a). The variable support mechanism (73) will be described with reference to this figure. It has an inner cylinder (75) extending by a mechanism. Therefore, by operating the feeding mechanism, the inner cylinder (75) extends from the outer cylinder (74), and the right screed (7a) moves to the right. The left screed (7b) is also movable by a similar mechanism. Therefore, by moving the two screeds (7a) and (7b) in the left and right directions, it is possible to cope with roads with different road surface widths. be able to. Although not shown, the first screed (6) has a structure in which two screeds are connected to each other by a universal joint at the center of the machine body, and it is possible to cope with a case where the road surface inclines in a mountain shape. There is.

A tubular vibrating body (8) is provided behind the second screed (7), and the cylindrical vibrating body (8) can be moved up and down by an elevating mechanism (81). Although not shown, a plurality of vibrators are arranged inside the cylindrical vibrating body (8). FIG. 8 shows the positional relationship between the first screed (6) and the second screed (7) and the cylindrical vibrating body (8) when the second screed (7) is expanded (when the two screeds move to the left and right respectively). It is a schematic diagram which shows. In the figure, (K) is a mold. In the concrete paving material laying work using the concrete finisher (1), the concrete that has been vibrated and compacted by the first screed (6) is re-vibrated and compacted by the second screed (7). However, when the second screed (7) is expanded, the road surface at the inner end of the second screed (7) bumps due to the left-right positional relationship between the first screed (6) and the second screed (7). It will rise in a shape. The cylindrical vibrating body (8) is provided to eliminate this drawback, that is, the road bumps generated by vibration compaction in the second screed (7) are leveled and the road surface is flattened. Is to be finished.

Hereinafter, a road pavement operation using the concrete finisher (1) having the above configuration will be described. First, a formwork is installed on the side edge of the road surface that requires paving, and then the concrete finisher (1) is placed on the road surface. Then, the second screed (7) is expanded left and right according to the road surface width, and the pavement material (green concrete) is put into the hopper (3). When the concrete is poured, the ready-mixed concrete is conveyed to the front of the screw conveyor (4) by the conveying mechanism (5) provided on the bottom of the hopper, and the screw blades (41) of the screw conveyor (4) move it from the central part to the left and right. It is fed laterally and spread evenly on the road surface. The spread concrete is subjected to vibration compaction by a first screed (6) provided behind the screw conveyor (4), and then a second screed (provided behind the first screed (6) ( By 7), vibration compaction is performed again. Then, finally, the road surface is flattened by the cylindrical vibrating body (8) provided behind the second screed (7).

[0014]

[Effect of device]

 As described above, the present invention is a concrete finisher for running tires on a road surface, in which a hopper opened upward in the front part of the machine body and a pavement material put into the hopper are screwed to the rear of the machine body. A transport mechanism for transporting to the front, a first screen provided at the rear of the screw conveyor and having a vibrator and a tamper, a second screed provided at the rear of the first screed and also having a vibrator and a tamper, and A concrete finisher characterized by comprising a cylindrical vibrating body provided behind two screeds, wherein the second screed is composed of two screeds movable in the machine width direction. Has the effect described.

That is, since it is a tire-running type, unlike the conventional rail-running concrete finisher, there is no need to install rails or suspend and hang the concrete finisher by a crane during construction, and work time is reduced. It can be shortened and construction efficiency is excellent. Also, since it is not necessary to install rails, it can be used even on roads where the road width in the construction section is narrow and rail installation is difficult. Furthermore, since the second screed can be expanded and contracted, the construction width can be changed, and it is possible to cope with construction sections where the road surface width changes from the middle. Moreover, since the cylindrical vibrating body is provided behind the second screed, even when the second screed is expanded, the vibration of the cylindrical vibrating body causes the left and right positional relationship between the first screed and the second screed to cause the road surface to move. The bump-like ridges generated on the road can be leveled, and a flat finished pavement road surface can be obtained. Further, not only ordinary concrete but also concrete containing steel fiber can be used to spread the surface layer evenly.

[Brief description of drawings]

FIG. 1 is a side view showing an example of an embodiment of a concrete finisher according to the present invention.

FIG. 2 is a partially cutaway front view showing an example of the embodiment of the concrete finisher according to the present invention.

FIG. 3 is a plan view showing an example of an embodiment of the concrete finisher according to the present invention.

FIG. 4 is a rear view showing an example of the embodiment of the concrete finisher according to the present invention.

FIG. 5 is a front view of a main part of a screw conveyor.

FIG. 6 is a cross-sectional view of the rear portion of the concrete finisher machine body.

FIG. 7 is a cross-sectional view of a second screed.

FIG. 8 is a schematic diagram showing a positional relationship between the first and second screeds and the cylindrical vibrating body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete finisher 2 Tire 3 Hopper 4 Screw conveyor 5 Conveying mechanism 6 1st screed 61 Vibrator 62 Tamper 7 2nd screed 71 Vibrator 72 Tamper 8 Cylindrical vibrating body

Claims (1)

[Scope of utility model registration request] 1. A concrete finisher for running tires on a road surface, the hopper having an upper opening at a front portion of the machine body, and a conveying mechanism for conveying the pavement material thrown into the hopper to a front side of a screw conveyor behind the machine body. A first screed provided at the rear of the screw conveyor and having a vibrator and a tamper, a second screed provided at the rear of the first screed and also having a vibrator and a tamper, and a cylinder provided at the rear of the second screed A concrete finisher comprising: a second vibrating body, wherein the second screed is composed of two screeds that are movable in the machine width direction.