JPH07239329A - Device for producing test sample of asphalt mixture - Google Patents

Abstract

PURPOSE:To provide a device for producing test sample capable of compacting an asphalt mixture while applying kneading and revolving motion thereto and making the angle of inclination of the kneading and revolving motion at the time of compaction variable and having a simple structure. CONSTITUTION:The test sample producing device has a test sample form 11, a pressure means 12, a form presser 130, a rotary support member 131, a rotary means 132, two sets of roller pairs 133 and position adjusting mechanisms 134. The positions of the roller pairs 33 are adjusted by the position adjusting mechanisms 134 to incline the form presser 130 by a predetermined angle and, after an asphalt mixture 3 is received in the test sample form 11, the mixture 3 is pressurized by the hydraulic cylinder 123 of the pressure means 12 while the rotary support member 131 is rotated by the rotary means 132 to compact the mixture 3 while applying kneading and revolving motion thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an asphalt mixture, which is subjected to a kneading and swirling motion while compacting the mixture, to perform a compounding test,
The present invention relates to a device for producing a specimen of an asphalt mixture for obtaining a specimen to be used in various tests such as a mechanical test.

[0002]

2. Description of the Related Art Since an asphalt mixture sample shows different mechanical properties depending on the composition and compaction, the asphalt mixture sample is as similar as possible to a site paved. It must be compacted and formed in the state.

As a conventional specimen manufacturing apparatus which is said to be close to compaction by a traffic vehicle, a gyre compactor 1 shown in FIG. 7 and the like are known.

In this gyrotory compactor 1, a pair of pressure heads 4a and 4b pressurize an asphalt mixture 3 contained in a cylindrical sample mold 2 and then a cylindrical mold holder 5 is pressed. While rotating the upper roller 6a and the lower roller 6b with the upper roller 6a and the lower roller 6b setting the flange 5a provided at the upper end to a predetermined inclination angle, for example, 1 °, while giving a kneading and swirling motion to the asphalt mixture 3. It is then compacted to obtain specimens for various tests.

[0005]

However, in the conventional device 1, since it is difficult or impossible to change the inclination angle of the formwork retainer 5, it is possible to perform compaction according to the paving condition of each site. There was the problem of being difficult or impossible.

Further, in order to confirm whether or not the density of the obtained test piece has reached a specified value, the displacement of the pressure head and the rotational speeds of the upper roller 6a and the lower roller 6b are detected by sensors. However, since the operator has obtained the density based on the detected values, there is a problem that the operator is annoyed.

Therefore, the present invention has been made in view of the above circumstances, and it is possible to compact the asphalt mixture while giving a kneading and swirling motion, and the tilt angle of the swirling motion at the time of compaction is variable. It is an object of the present invention to provide an apparatus for producing a specimen of an asphalt mixture having a simple structure.

[0008]

In order to achieve the above object, the apparatus for producing a sample of an asphalt mixture according to claim 1 compacts the asphalt mixture while giving a kneading and swirling motion to the various tests. In the device for producing a sample of an asphalt mixture to obtain a sample, a cylindrical sample frame in which the asphalt mixture is stored, and a pair of pressures in which the asphalt mixture stored in the sample frame is opposed to each other. A pressurizing means for pressurizing in the pressurizing axial direction by a head, and a cylindrical formwork that is rotatably fitted to the outside of the sample formwork and has guide rails projecting over the entire outer peripheral surface. Two pairs of rollers, which are provided at the position of the presser, the rotation support member rotatably around the pressing shaft, and the rotation support member facing the guide rail, and which sandwich the guide rail. A position adjusting mechanism that is provided on the rotation supporting member and that can adjust the positions of the two pairs of rollers separately, and a rotating unit that rotates the rotation supporting member around the pressing shaft. It is what

Further, in the asphalt mixture specimen manufacturing apparatus according to a second aspect of the present invention, there is provided an input means for inputting a mass of the asphalt mixture contained in the specimen mold and a displacement for detecting a displacement amount of the pressure head. Amount detecting means, a rotation speed detecting means for detecting the rotation speed of the position adjusting mechanism, and the density of the asphalt mixture based on the input mass and the detection result of the displacement amount detecting means, and the obtained density And a generating means for generating a relational diagram of the density of the asphalt mixture and the number of rotations from the detection result of the number of rotations detecting means.

[0010]

According to the apparatus for producing a test piece for an asphalt mixture according to claim 1, the position adjusting mechanism adjusts the position of the pair of rollers to incline the frame holder by a predetermined angle, and the asphalt mixture is placed in the sample frame. After storing, the asphalt mixture is pressurized by the pair of pressure heads of the pressure means and the rotation support member is rotated by the rotation means, so that the asphalt mixture is compacted while performing a kneading and swirling motion. Also,
By adjusting the position of at least one of the two roller pairs by the position adjusting mechanism, the inclination angle of the mold holder is changed and the inclination angle of the kneading and swirling motion given to the asphalt mixture is changed. In addition, a guide rail is provided on the outer peripheral surface of the formwork retainer, two pairs of rollers for sandwiching the guiderail are provided, and a mechanism for adjusting the position of the roller pair is provided, whereby the inclination angle of the formwork retainer can be set. Therefore, the structure is simplified.

According to the asphalt mixture sample preparation apparatus of the second aspect, since the relationship between the density of the asphalt mixture and the number of revolutions is prepared by the preparing means, the compaction can be easily evaluated. The calculation error can be prevented, and the operator's labor can be saved.

[0012]

EXAMPLE FIG. 1 is a schematic configuration diagram showing an example of an apparatus for producing a sample of an asphalt mixture according to the present invention, and FIG. 2 is a plan view excluding a pressing means 12.

As shown in FIG. 1, the specimen manufacturing apparatus 10 of this embodiment comprises a cylindrical specimen mold 11 for accommodating the asphalt mixture 3 and a pressurizing means 12 for pressurizing the asphalt mixture 3. A swirl motion imparting means 13 for imparting a kneading swirl motion to the asphalt mixture 3, an input unit 14 for performing various settings, a display unit 15 for performing various displays, and a relationship between density and rotation speed, as shown in FIG. 3 described later. An output unit 16 for outputting drawings and the like, and a control unit 17 for controlling each unit of the apparatus 10.
And has a kneading and swirling motion to the asphalt mixture 3 to compact it.

Next, the details of each of the above parts will be described.

The pressing means 12 includes a horizontally movable upper head 120 and a horizontally fixed lower head 12 which are arranged to face each other.
1, a hydraulic cylinder 123 that presses the horizontally movable upper head 120 downward by a pressing shaft 122, and a position sensor 124 such as a linear sensor that detects displacement of the pressing shaft 122 in the vertical direction. The horizontally movable head 120 and the pressure shaft 122 are not fixed to each other and can move in the horizontal direction even when the horizontal force of a certain level or more is applied even when the asphalt mixture 3 is pressurized. There is. The horizontally fixed lower head 121 has a fixed shaft 125.
It is fixed to the upper end of.

The turning motion imparting means 13 is rotatably fitted to the outer side of the sample mold 11 and has a cylindrical form retainer 130 in which a guide rail 130a is projected over the entire outer peripheral surface. A rotation support member 131 rotatably supported around the pressure axis, a rotation means 132 for rotating the rotation support member 131, and a rotation support member 131 facing the guide rail 130a. Thirteen
2 sets of roller pairs 133 that sandwich 0a and a position adjusting mechanism 13 that is attached inside the rotation support member 131 and that can adjust the height positions of the two sets of roller pairs 133 separately.
4 and a rotation sensor 135 such as a magnetic sensor that detects the number of rotations of the rotation support member 131.

As shown in FIG. 2, the rotation support member 131 has a substantially U-shaped cross section so that the mold holder 130 can be inserted from the front side. As a result, it is possible to easily set the sample mold 11 and the mold retainer 130 having different diameters.

The rotating means 132 includes a driven gear 1320 fixed to a lower portion of the rotation supporting member 131 and a motor 132.
1 and a motor driving unit 1322 shown in FIG. 3 for driving the motor 1321 and transmitting the rotational driving force of the motor 1321 from the driving gear 1323 to the driven gear 1320.

The position adjusting mechanism 134 has a pair of screws 1341 and a lock screw 1342 for moving the movable block 1340, to which the roller pair 133 is fixed, in the up-down direction, inside the pair of rotation supporting members 131 and facing each other. It is provided in. By adjusting the height of the movable block 1340 with the screw 1341, it is possible to adjust the inclination angle of the form holder 130 within the range of 0.5 to 5 °.

FIG. 3 is a block diagram showing the control system of this embodiment.

The apparatus 10 includes a control unit 17 and an input unit 1
4, the position sensor 124, the rotation sensor 135, the motor drive unit 1322, the display unit 15, and the output unit 16 are connected.

The input unit 14 includes a loading time setting device 14a for setting a loading time and a rotation speed setting device 14 for setting a rotation speed.
b and a specimen diameter setter 14c for setting the diameter of the specimen
And a mass setter 14d for setting the mass.

The display unit 15 includes a rotation speed indicator 15a for displaying the rotation speed and a specimen height display 15b for indicating the height of the specimen.

A CRT display, a printer, a flexible disk or the like is applied to the output unit 16.

The control unit 17 includes a memory (not shown) in which the relationship between the diameter of the specimen, the loading time and the flow rate or pressure of the hydraulic system is stored in advance, and is shown in FIG. 4, for example, based on the information stored in the memory. As described above, the hydraulic cylinder 123 is controlled so that the final load reaches the loading time set by the loading time setting device 14a. The shorter the loading time is, the more efficient the production of the specimen can be achieved. However, depending on the asphalt mixture 3, it is better to increase the loading time for sufficient compaction, so the loading time can be set. By doing so, it becomes possible to perform optimum compaction according to the asphalt mixture 3.

The control unit 17 also includes a hydraulic cylinder 123.
The load applied to the asphalt mixture 3 is controlled so as to linearly increase with time after the start of pressurization and gradually increase immediately before the final load by the control of (1). This allows optimal compaction of the asphalt mixture 3.

Further, the control unit 17 creates a relationship diagram between the height of the specimen and the number of rotations as shown in FIG. 5 from the detection result of the position sensor 124 and the detection result of the rotation sensor 135.
The output section 16 outputs the data.

The control unit 17 also obtains the density of the asphalt mixture 3 based on the mass set by the mass setter 14d and the detection result of the position sensor 124, and the obtained density and the detection result of the rotation sensor 135. The relationship diagram between the density and the rotation speed of the asphalt mixture 3 is created from the above, and the relationship diagram as shown in FIG. 6 is output from the output unit 16.

Next, the operation of this embodiment will be described.

First, the operator weighs the mass of the asphalt mixture 3 to be compacted.

Subsequently, the operator operates the input unit 14 to make necessary settings. That is, the loading time is set by the loading time setting device 14a, the rotation speed is set by the rotation speed setting device 14b, the diameter of the test object is set by the test object diameter setting device 14c, and the mass setting device 14d measures the weight. Set the mass.

After the setting operation is completed, the position adjusting mechanism 134
The screw 1341 is rotated to adjust the height position of the movable block 1340 and fixed by the lock screw 1342, and the form holder 130 is tilted at a predetermined angle, and the asphalt mixture 3 is placed in the sample form 11. Store.

After the preparation is completed in this way, compaction is started by operating an unillustrated start button.

The control unit 17 pressurizes the pressurizing means 12 so as to reach a predetermined load during the set load time.
Of the hydraulic cylinder 123 is controlled. Hydraulic cylinder 123
Under the control of the control unit 17, the asphalt mixture 3 contained in the sample mold 11 is pressurized. That is, the hydraulic cylinder 123 presses the horizontally movable upper head 120 downward by the pressing shaft 122 to press the asphalt mixture 3. The asphalt mixture 3 is compacted between a horizontally movable upper head 120 and a horizontally fixed lower head 121.

After that, the control unit 17 controls the motor drive unit 1322 of the rotating means 132 so that the set rotation speed is achieved. Under the control of the control unit 17, the motor drive unit 1322 drives the motor 1321 to rotate the rotation support member 131.
To rotate. That is, the motor 13 of the rotating means 132
The rotational driving force of 21 is transmitted from the driving gear 1323 to the driven gear 1320, and the rotation support member 131 rotates.

As a result, the asphalt mixture 3 is compacted while being given a kneading and swirling motion.
Specimens of 00 to 150 mm and height of 60 to 150 mm are manufactured. The specimen manufactured in this manner is subjected to various tests such as a compounding test and a mechanical test.

According to the above-described embodiment, the pressurizing means 12 pressurizes the asphalt mixture 3 and the rotating means 132 simultaneously presses the asphalt mixture by the position adjusting mechanism 134 while inclining the mold holder 130 by a predetermined angle. Since 3 can be rotated, the asphalt mixture 3 can be compacted while giving a kneading and swirling motion.

Further, the position adjusting mechanism 134 makes it possible to change the inclination angle of the kneading and swirling motion during compaction.

Further, a guide rail 130a is provided on the outer peripheral surface of the formwork retainer 130, two pairs of rollers 133 for sandwiching the guide rail 130a are provided, and a mechanism for adjusting the position of the roller pair 133 is provided. Since the inclination angle of the mold holder 130 is variable, the structure is simple.

The present invention can be variously modified within the scope of the gist other than the above-mentioned embodiment. For example, the present invention can also be applied to a test apparatus by providing means for observing the compacted state.

[0041]

According to the invention described in claim 1, which has been described in detail above, the asphalt mixture is pressurized, and at the same time, the kneading and swirling motion is applied to the mold holder, so that the asphalt mixture is compacted while the kneading and swirling motion is applied. In addition, since the position adjusting mechanism is provided, the tilt angle of the turning motion is variable, and the structure for adjusting the tilt angle of the form holder is simple, so that the structure of the device is simple. .

According to the second aspect of the present invention, since the creating means creates the relationship diagram between the density of the asphalt mixture and the rotation speed, the compaction can be easily evaluated and the calculation error can be prevented. This can be prevented and the labor of the operator can be saved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of an apparatus for producing a specimen of an asphalt mixture according to the present invention.

FIG. 2 is a plan view excluding pressurizing means.

FIG. 3 is a block diagram showing a control system of this embodiment.

FIG. 4 is a graph for explaining the operation of this embodiment.

FIG. 5 is a diagram showing an output example of this embodiment.

FIG. 6 is a diagram showing an output example of this embodiment.

FIG. 7 is a cross-sectional view of a main part of a conventional device for producing a specimen of an asphalt mixture.

[Explanation of symbols]

 3 Asphalt Mixture 10 Specimen Preparation Device for Asphalt Mixture 11 Specimen Form 12 Pressurizing Means 120 Horizontally Movable Upper Head 121 Horizontally Movable Lower Head 130 Form Frame Presser 130a Guide Rail 131 Rotation Supporting Means 132 Rotating Means 133 Roller Pairs 134 Position Adjustment mechanism

Claims (2)

[Claims] Claim: What is claimed is: 1. An asphalt mixture sample preparation apparatus for obtaining a sample to be subjected to various tests by compacting the asphalt mixture while giving a kneading and swirling motion to a cylindrical sample containing the asphalt mixture. A body form, pressurizing means for pressurizing the asphalt mixture contained in the sample formwork in a pressurizing axial direction by a pair of pressure heads arranged to face each other, and rotatably outside the sample formwork. A cylindrical form frame retainer that is fitted and has a guide rail projecting over the entire circumference of the outer peripheral surface, a rotation support member that is rotatably arranged around the pressurizing shaft, and an opposed guide rail. And a pair of roller pairs provided at the position of the rotation support member for sandwiching the guide rail, and a position adjustment capable of individually adjusting the positions of the two pairs of rollers provided on the rotation support member. An asphalt mixture sample manufacturing apparatus, comprising: a leveling mechanism; and a rotating unit configured to rotate the rotation supporting member around the pressing axis. 2. An input means for inputting a mass of an asphalt mixture stored in the sample mold, a displacement amount detecting means for detecting a displacement amount of the pressure head, and a rotational speed of the position adjusting mechanism. Rotational speed detection means, to obtain the density of the asphalt mixture based on the input mass and the detection result of the displacement amount detection means, from the obtained density and the detection result of the rotational speed detection means of the asphalt mixture 2. A device for producing a specimen of an asphalt mixture according to claim 1, further comprising: creating means for creating a relationship diagram between the density and the rotation speed.