CN206258327U - A kind of roadbed creep strength point load tests device - Google Patents

Abstract

The utility model discloses a point load testing device for creep strength of a subgrade, which comprises a bracket, a pressure applying mechanism installed on the bracket, a lifting mechanism that drives the pressure applying mechanism to move from bottom to top, and a detection unit; the bracket includes a base, The horizontal plate located above the base and the two connecting columns between the base and the horizontal plate; the pressure applying mechanism includes two guide rods vertically fixed under the horizontal plate, and a support plate installed horizontally on the guide rods. A lower pressing head is fixed on the plate, and an upper pressing head is coaxially arranged above the lower pressing head, and the upper pressing head is fixedly installed under the horizontal plate; the lifting mechanism includes two fixed pulleys fixed above the horizontal plate The fixed pulley is provided with a traction rope, one end of the traction rope is fixed on the support plate, and the other end of the traction rope is connected with a weight. The testing device has the advantages of simple structure, convenient operation, low manufacturing cost and stable and reliable test results.

Description

A point load test device for subgrade creep strength

technical field

The utility model belongs to the technical field of creep strength testing of road engineering materials, in particular to a point load testing device for roadbed creep strength.

Background technique

Creep strength of subgrade in road engineering is one of the important parameters to describe the mechanical properties of subgrade. In road engineering, creep failure is a main form of road material failure. At present, there are several creep strength test devices and test methods, but there is no unified test method and corresponding test device for testing the creep strength of the roadbed. Now when testing the creep strength of the road subgrade in the laboratory, There are various defects and deficiencies such as non-uniform test standards, inconvenient operation of the test device, complex structure of the test device, and inaccurate test results.

Utility model content

The technical problem to be solved by the utility model is to provide a point load testing device for the creep strength of the subgrade in view of the above-mentioned deficiencies in the prior art. The testing device has the advantages of simple structure, low manufacturing cost, convenient use and operation, stable and reliable test results, and effectively avoids the phenomenon of complex operation and unstable test results of the existing testing device.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a subgrade creep strength point load test device, which is characterized in that it includes a bracket, a pressure applying mechanism installed on the bracket for applying load to the tested piece, A lifting mechanism that drives the pressure applying mechanism to move from bottom to top, and a detection unit used to detect the loading time and creep of the tested piece;

The support includes a base, a horizontal plate located above the base, and two connecting columns for connecting the base and the horizontal plate;

The pressure applying mechanism includes two guide rods vertically fixed below the horizontal plate, and a support plate slidably installed on the guide rods. The lower pressure head is fixed on the support plate, and the upper part of the lower pressure head is coaxially arranged. There is an upper pressure head, and the upper pressure head is fixedly installed under the horizontal plate;

The lifting mechanism includes two fixed pulleys fixed above the horizontal plate, the two fixed pulleys are symmetrically arranged relative to the upper pressure head, the fixed pulleys are provided with a traction rope, and one end of the traction rope is fixed on the support plate , the other end of the traction rope is connected with a weight;

The aforementioned creep strength point load testing device for subgrade is characterized in that the traction rope is a steel wire rope.

The above-mentioned creep strength point load testing device for subgrade is characterized in that: the detection unit is a digital display dial gauge, the head of the digital display dial gauge is fixed on the guide rod, and the digital display dial gauge The measuring head of the meter contacts the support plate, and the data output end of the digital display dial indicator is connected with the industrial computer.

The above-mentioned creep strength point load test device for subgrade is characterized in that: the support plate is provided with a through hole for the guide rod to pass through.

The above-mentioned creep strength point load testing device for subgrade is characterized in that: both the upper indenter and the lower indenter are conical indenters.

Compared with the prior art, the utility model has the following advantages:

1. The utility model is simple in structure and easy to operate. The weight of the weight is used to adjust the applied load. At the same time, the digital display dial gauge can read the displacement and loading time of the upward movement of the support plate in time, and it is displayed on the screen with the digital display dial gauge. On the connected industrial computer, the displacement of the support plate is the creep value of the tested piece, so the test device can directly and conveniently collect the parameters needed to calculate the creep strength.

2. The utility model has simple manufacturing process, low manufacturing cost and convenient installation, which is convenient for mass production.

3. The traction rope of the utility model adopts steel wire rope, which is convenient to obtain materials, and the steel wire rope has high strength and stable operation.

To sum up, the utility model has the advantages of simple structure, convenient operation, low investment cost, reasonable structural design, convenient operation and good use effect.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Figure 2 is an enlarged view of A in Figure 1 .

Fig. 3 is a circuit connection block diagram of the detection unit of the utility model and the industrial computer.

Fig. 4 is the use status diagram of the utility model.

Explanation of reference signs:

1-1—base; 1-2—connecting column; 1-3—horizontal plate;

2—weight; 3—traction rope; 4—fixed pulley;

5—upper pressure head; 6—lower pressure head; 7—digital indicator;

8—guide rod; 9—support plate; 10—industrial computer;

11—The piece under test.

detailed description

A kind of subgrade creep strength point load testing device as shown in Figure 1, comprises support, is installed on the support and is used for applying the pressure mechanism of load to the tested piece 11, the lifting mechanism that drives pressure application mechanism to move from bottom to top, And a detection unit used to detect the loading time and creep value of the tested piece 11;

The bracket includes a base 1-1, a horizontal plate 1-3 above the base 1-1, and two connecting columns 1-2 for connecting the base 1-1 and the horizontal plate 1-3;

Described pressing mechanism comprises two guide rods 8 that are vertically fixed below horizontal plate 1-3, the support plate 9 that is horizontally installed on guide rod 8, and described support plate 9 is fixed with lower pressure head 6, and described An upper pressing head 5 is arranged coaxially above the lower pressing head 6, and the upper pressing head 5 is fixedly installed under the horizontal plate 1-3;

The lifting mechanism includes two fixed pulleys 4 fixed on the top of the horizontal plate 1-3, the two fixed pulleys 4 are symmetrically arranged relative to the two pressure heads, and the fixed pulley 4 is provided with a traction rope 3, and the traction One end of the rope 3 is fixed on the support plate 9, and the other end of the traction rope 3 is connected with a weight 2;

In this embodiment, the upper indenter 5 and the lower indenter 6 are arranged coaxially, which can make the whole testing device more stable and the measured data more accurate. The use of two symmetrically arranged fixed pulleys 4 can make the support plate 9 move smoothly, so that the loading force applied by the upper indenter 5 and the lower indenter 6 is stable, and the test result is more accurate.

In this embodiment, the traction rope 3 is a steel wire rope with a diameter of 1mm-2mm. The steel wire rope has high strength, light weight, stable operation, is not easy to break suddenly, and is reliable in operation.

In the present embodiment, the detection unit is a digital display dial gauge 7, as shown in Figure 2, the head of the digital display dial gauge 7 is fixed on the guide rod 8, and the measurement of the digital display dial gauge The head touches the support plate 9, and the data output end of the digital display dial gauge 7 is connected to the industrial computer 10. The digital display dial gauge 7 is a type II digital display dial gauge, and has a micro USB data port, as shown in Figure 3 As shown, the digital display dial gauge 7 is connected to the industrial computer 10, and the type II digital display dial gauge adopted has multi-function keys, and has the functions of data retention, quick display, and finding the maximum and minimum values in the test.

During specific implementation, the support plate 9 is provided with a through hole for the guide rod 8 to pass through, and the support plate 9 slides vertically along the guide rod 8, thereby applying a load to the test piece 11 so that the test piece 11 generates creep.

In this embodiment, the width of the support plate 9 is smaller than the width of the horizontal plate, so that the weight of the entire test device is reduced on the basis of satisfying the stability of the entire test device, and it is convenient to use.

During specific implementation, both the upper indenter 5 and the lower indenter 6 are conical indenters, and the use of conical indenters can make the test data more accurate.

As shown in Figure 4, when the utility model is in use, the test piece 11 is fixed between the upper indenter 5 and the lower indenter 6, and the support plate 9 is moved vertically upward along the guide rod 8 through the weight 2, thereby Apply a vertical creep load to the tested piece 11, so that the tested piece 11 produces a creep value, and the digital display dial indicator 7 fixed on the guide rod 8 records the displacement of the support plate 9 in the industrial computer 10 through the data line in time. Above, the applied load is directly read through the weight 2, and the displacement of the support plate 9 is equal to the creep value of the tested piece 11. The utility model can calculate the applied load, creep value and time required for creep strength The parameters are acquired accurately and in time, and the creep strength of the tested piece 11 is finally calculated.

During specific implementation, the tested piece 11 to be measured by the utility model can be the tested piece of shale soil, cement concrete, asphalt concrete, improved soil or remodeled soil, and can test the tested pieces of different specifications, preferably Yes, the tested piece 11 is a shaped cylinder or square, and the length, width and height of the square tested piece 11 are all 150mm.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present utility model still belong to Within the scope of protection of the technical solution of the utility model.

Claims (5)

1. a kind of roadbed creep strength point load tests device, it is characterised in that：Including support, rack-mount for quilt The hoisting mechanism that the pressure exerting arrangement of test block (11) imposed load, drive pressure exerting arrangement are moved from the bottom to top, and for detecting Test specimen (11) load time and the detection unit of creep compliance；

The support is used for connect base including base (1-1), the transverse slat (1-3) above base (1-1) and two The connecting pole (1-2) of (1-1) and transverse slat (1-3)；

The pressure exerting arrangement includes two guide rods (8) being fixed on vertically below transverse slat (1-3), is slidably mounted on guide rod (8) Supporting plate (9), push-down head (6) is fixed with the supporting plate (9), be coaxially arranged with pressure above the push-down head (6) Head (5), the seaming chuck (5) is fixedly mounted on transverse slat (1-3) lower section；

The hoisting mechanism includes being fixed on two fixed pulleys (4) above transverse slat (1-3), and two fixed pulleys (4) are relative Seaming chuck (5) is symmetrical arranged, and pull rope (3) is provided with the fixed pulley (4), and one end of the pull rope (3) is fixed on branch On fagging (9), the other end of the pull rope (3) is connected with counterweight (2).

2. a kind of roadbed creep strength point load tests device according to claim 1, it is characterised in that：The pull rope (3) it is steel wire rope.

3. a kind of roadbed creep strength point load tests device according to claim 1 and 2, it is characterised in that：The inspection Survey unit is digital display dial gauge (7), and the gauge outfit of the digital display dial gauge (7) is fixed on guide rod (8), the digital display dial gauge (7) measurement head is contacted with supporting plate (9), and the data output end of the digital display dial gauge (7) is connected with industrial computer (10).

4. a kind of roadbed creep strength point load tests device according to claim 1 and 2, it is characterised in that：The branch The through hole passed through for guide rod (8) is offered on fagging (9).

5. a kind of roadbed creep strength point load tests device according to claim 1 and 2, it is characterised in that：On described Pressure head (5) is circular cone pressure head with push-down head (6).