Measuring instrument for simulating continuous compaction process of roadbed and pavement

Abstract

The invention discloses a tester for simulating a continuous compaction process of a roadbed and a pavement. The tester consists of a supporting part and a rolling part, the supporting part comprises a rectangular support and a lifting device, a front sliding rail and a rear sliding rail which are horizontally arranged are arranged on the rectangular support, the two ends of the sliding rails are connected to stand columns of the rectangular support in a sleeving mode respectively, and the lifting device can drive the sliding rails to slide up and down along the stand columns; the grinding part comprises a translation support, a translation motor, a vibration grinding wheel and a sample containing groove, the translation support is connected between the two sliding rails in a sliding mode, the translation motor can drive the translation support to reciprocate in the direction of the sliding rails, the vibration grinding wheel is rotationally connected to the lower end of the translation support, and the sample containing groove is formed below the vibration grinding wheel. The device is simple in structure, convenient to operate and capable of simulating the on-site paving and rolling effect of the roadbed and the pavement, the indoor compaction test process is omitted, and the test result can directly guide the on-site continuous compaction process of the roadbed and the pavement.

Description

Technical Field

[0001] The present invention relates to an indoor simulation test device for on-site rolling construction of subgrade and pavement, and specifically to a continuous compaction process measuring instrument for simulating subgrade and pavement. Background Art

[0002] In the case of the rapid growth of the expressway industry in China, the construction quality during the construction period is particularly important. The key link in the construction quality of expressways is the compaction degree of the subgrade. If the compaction quality of the subgrade does not meet the standard, it will cause quality problems such as subgrade settlement and pavement collapse, and will trigger serious traffic accidents such as collisions and rollovers. The traditional method for determining the rolling process of subgrade and pavement mainly initially determines the maximum dry density through indoor compaction tests, and then relies on engineering experience to construct test roads, and then determines the rolling process. When the test results of the test road do not meet the standard, it is necessary to dig and re-lay, which requires a large amount of manpower, machinery, resources, etc. during the process, and the efficiency is low. Therefore, there is an urgent need to develop an indoor test instrument that can simulate the on-site paving and rolling process, organically combine the indoor and on-site, and ensure the paving quality of subgrade and pavement while improving the test efficiency. Summary of the Invention

[0003] Aiming at the defects of the prior art, the present invention provides a continuous compaction process measuring instrument for simulating subgrade and pavement, which has a simple structure and convenient operation, can simulate the on-site paving and rolling effect of subgrade and pavement, eliminates the indoor compaction test process, and the test results can directly guide the on-site continuous compaction process of subgrade and pavement.

[0004] The present invention achieves the above object through the following technical solutions:

[0005] The continuous compaction process measuring instrument for simulating subgrade and pavement is composed of a support part and a rolling part;

[0006] The support part includes a rectangular bracket and a lifting device. There are two horizontally arranged slide rails on the rectangular bracket. The two ends of the slide rails are respectively sleeved on the columns of the rectangular bracket, and the lifting device can drive the slide rails to slide up and down along the columns;

[0007] The rolling part includes a translation bracket, a translation motor, a vibrating roller, and a sample holding tank. The translation bracket is slidably connected between the two slide rails. The translation motor can drive the translation bracket to reciprocate along the direction of the slide rails. The vibrating roller is rotatably connected to the lower end of the translation bracket, and the sample holding tank is placed below the vibrating roller.

[0008] Further, the lifting device includes a lifting motor and several chains. The lifting motor is fixed on the rectangular bracket, and the slide rail is connected to the lifting motor through the chains.

[0009] Further, the slide rail is a C-shaped steel rail, and there are four bearings embedded in the slide rail on the translation bracket. The translation bracket can slide along the track direction of the C-shaped steel rail.

[0010] Furthermore, the lower end of the translation support is connected to the vibrating roller through a triangular steel beam.

[0011] Furthermore, the sample holding tank is independently detachable, and its inner wall is padded with a detachable 5-mm thick rubber pad.

[0012] Furthermore, the present invention also has a control part, including a digital controller and a sensor. The sensor is installed on the rotating shaft of the vibrating roller. The digital controller is electrically connected to the instrument power supply, the lifting motor, the translation motor, the vibrating roller, and the sensor respectively. The digital controller can control the on / off of the instrument power supply, the up and down lifting of the rectangular support driven by the lifting motor, the left and right movement of the translation support driven by the translation motor, the rolling speed and number of passes of the vibrating roller driven by the translation motor, the amplitude and vibration frequency of the vibrating roller, and receive and process the sensor signals.

[0013] Compared with the prior art, the advantages and effects of the present invention are as follows: When using this instrument, it can simulate the on-site paving and rolling effects of subgrade and pavement, eliminate the indoor compaction test process, and the test results can directly guide the on-site continuous compaction process of subgrade and pavement. Brief Description of the Drawings

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 It is a structural schematic diagram of the slide rail in the present invention.

[0016] Drawing number identification: 1. Rectangular support; 2. Slide rail; 3. Translation support; 4. Translation motor; 5. Vibrating roller; 6. Sample holding tank; 7. Chain; 8. Lifting motor; 9. Digital controller; 10. Sensor. Detailed Embodiments

[0017] The following further illustrates the present invention in conjunction with embodiments, but the present invention is not limited to these embodiments.

[0018] The continuous compaction process measuring instrument for simulating subgrade and pavement in this embodiment, as Figure 1 shown, is composed of a support part, a rolling part, and a control part:

[0019] The support part includes a rectangular support 1 composed of four columns and a lifting device. There are two horizontally arranged slide rails 2 (as Figure 2 shown) on the rectangular support 1. Both ends of the slide rail 2 are sleeved on the columns of the rectangular support 1 through sleeves; the lifting device includes a chain 7 and a lifting motor 8. The lifting motor 8 is fixed on the rectangular support 1. Both ends of the slide rail 2 are respectively connected to the lifting motor 8 through the chain 7. The lifting motor 8 drives the slide rail 2 to slide up and down along the column by tightening and loosening the chain 7;

[0020] The rolling part includes a translation support 3, a translation motor 4, a vibrating roller 5, and a sample trough 6. The translation motor 4 is fixed on the translation support 3. The slide rail 2 is a C-shaped steel rail (as Figure 2 shown). There are four bearings on the translation support 3 that are embedded in the slide rail 2. When the drive shaft of the translation motor 4 rotates, it can drive the translation support 3 to slide left and right on the slide rail 2. A triangular steel beam is provided at the lower end of the translation support 3. The rotating shaft of the vibrating roller 5 is fixedly connected to the triangular steel beam. The sample trough 6 is detachably placed below the vibrating roller 5, and a detachable rubber pad with a thickness of 5 mm is also padded on its inner wall. The vibrating roller 5 can repeatedly roll the sample in the sample trough 6 as the translation support slides left and right;

[0021] The control part includes a digital controller 9 and a sensor 10. The sensor 10 is installed on the rotating shaft of the vibrating roller 5. The digital controller 9 is electrically connected to the instrument power supply, the lifting motor 7, the translation motor 4, the vibrating roller 5, and the sensor 10 respectively. The digital controller 9 can control the on-off of the instrument power supply, the up and down lifting of the rectangular support 1 driven by the lifting motor 7, the left and right movement of the translation support 3 driven by the translation motor 4, the rolling speed and number of passes of the vibrating roller 5 driven by the translation motor 4, the amplitude and vibration frequency of the vibrating roller 5, and receive and process the signals of the sensor 10;

[0022] The working principle of this embodiment is as follows:

[0023] 1. Before the test, preset the vibration amplitude and vibration frequency of the vibrating roller 5, and the rolling speed and number of passes of the vibrating roller 5 driven by the translation motor 4;

[0024] 2. Loosely spread the first layer of soil sample in the sample trough 6, measure and record the loose laying thickness, denoted as X1;

[0025] 3. Control the lifting motor 8 to tighten the chain 7, lift the slide rail 2 to an appropriate height, and then insert the sample together with the sample trough 6 directly below the vibrating roller 5;

[0026] 4. Control the lifting motor 8 to loosen the chain 7, so that the slide rail 2 naturally descends until the vibrating roller 5 is in full contact with the sample;

[0027] 5. Control the translation motor 4 to drive the translation support 3 to slide left and right on the slide rail 2, so as to drive the vibrating roller 5 to repeatedly roll the sample;

[0028] 6. After the rolling is completed, the sensor 10 records the compression amount X′1 of this layer;

[0029] 7. Lift the slide rail 2 to an appropriate height, pull out the sample trough 6, scrape the surface of the first layer of sample, loosely spread the second layer of sample in the sample trough 6, and repeat steps 4 and 5 until all layers are rolled, obtaining the loose laying thickness X i and the compression amount X′ i ;

[0030] 8. Determine the dry density ρ of the specimen in the sample container by the core cutter method or the sand replacement method i ;

[0031] 9. After changing the vibration amplitude and frequency of the vibrating roller 5 and the rolling speed and number of passes of the translation motor 4, repeat the above steps and list the dry density ρ of the specimen under each parameter condition i , and take the maximum dry density in the table as the maximum dry density ρ when calculating the degree of compaction max , then the degree of compaction of the soil sample can be calculated according to the relevant formula, and an appropriate compaction process can be selected

Claims

1. The continuous compaction process measuring instrument for simulated subgrade and pavement is characterized in that: It consists of a support part and a rolling part; The support part includes a rectangular bracket (1) and a lifting device. There are two horizontally arranged slide rails (2) on the rectangular bracket (1). The two ends of the slide rails (2) are respectively sleeved on the columns of the rectangular bracket (1). The lifting device can drive the slide rails (2) to slide up and down along the columns; The rolling part includes a translation bracket (3), a translation motor (4), a vibrating roller (5), and a sample holding tank (6). The translation bracket (3) is slidably connected between the two slide rails (2). The translation motor (4) can drive the translation bracket (3) to reciprocate along the direction of the slide rails (2). The vibrating roller (5) is rotatably connected to the lower end of the translation bracket (3). The sample holding tank (6) is placed below the vibrating roller (5).

2. The continuous compaction process measuring instrument for simulated roadbed and pavement according to claim 1, wherein: The lifting device includes a number of chains (7) and a lifting motor (8). The lifting motor (8) is fixed on the rectangular bracket (1). The slide rails (2) are connected to the lifting motor (8) through the chains (7).

3. The continuous compaction process measuring instrument for simulated subgrade and pavement according to claim 1, characterized in that: The slide rails (2) are C-shaped slide rails. There are four bearings embedded in the slide rails (2) on the translation bracket (3).

4. The continuous compaction process measuring instrument for simulated subgrade and pavement according to claim 3, characterized in that: The lower end of the translation bracket (3) is connected to the vibrating roller (5) through a triangular steel beam.

5. The continuous compaction process measuring instrument for simulated subgrade and pavement according to claim 1, characterized in that: The sample holding tank (6) is independently detachable, and its inner wall is padded with a detachable 5-mm thick rubber pad.

6. The continuous compaction process measuring instrument for simulated roadbed and pavement according to claim 1, wherein: It also includes a digital controller (9) and a sensor (10). The sensor (10) is installed on the rotating shaft of the vibrating roller (5). The digital controller (9) is electrically connected to the instrument power supply, the lifting motor (7), the translation motor (4), the vibrating roller (5), and the sensor (10) respectively.

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