CN203365260U - Rapid bearing ratio detector provided with guide cylinder and drop hammer - Google Patents
Rapid bearing ratio detector provided with guide cylinder and drop hammer Download PDFInfo
- Publication number
- CN203365260U CN203365260U CN 201320452342 CN201320452342U CN203365260U CN 203365260 U CN203365260 U CN 203365260U CN 201320452342 CN201320452342 CN 201320452342 CN 201320452342 U CN201320452342 U CN 201320452342U CN 203365260 U CN203365260 U CN 203365260U
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- hammer
- bearing ratio
- drop hammer
- guide cylinder
- guide
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Abstract
The utility model discloses a rapid bearing ratio detector provided with a guide cylinder and a drop hammer. The bearing ratio detector comprises the guide cylinder, the drop hammer is arranged in the guide cylinder, a hammer rod is arranged at the upper part of the drop hammer, a drop hammer handle is arranged at the upper end of the hammer rod, and an acceleration sensor is arranged inside the drop hammer handle and connected with an electronic testing device through a signal line; and a base is arranged on the edge of a lower port of the guide cylinder, a positioning pin is arranged on the inner wall of an upper port, and a guide cylinder handle is arranged on the outer wall. Firstly, the drop hammer in the guide cylinder falls freely at a certain height and impacts a roadbed surface, and the correlation between a signal of the acceleration sensor and the bearing ratio can be obtained through a comparative test; and then the bearing ratio of a roadbed soil mass can be acquired according to the correlation between the signal of the acceleration sensor and the bearing ratio, the detection speed is high, and the detection result is accurate.
Description
Technical field
The utility model relates to a kind of bearing ratio pick-up unit, relates in particular to the quick bearing ratio detector of a kind of guide drop hammer type.
Background technology
Bearing ratio is the intensity index of reflection subgrade soils and bedding material.Bearing ratio is called for short CBR value, while referring in the standard-sized injection bar injection test specimen of employing 2.5mm or 5.0mm, and the ratio of standard load intensity during required load intensity injection amount identical with the standard rubble.Bearing-ratio test comprises indoor and on-the-spot bearing-ratio test.
In prior art, for the test method of bearing ratio, be:
Actuating motor or shake the penetrometer crank, apply axle pressure, make the speed pressing in sample of injection bar with (1～1.25) mm/min, record dynamometer reading and corresponding injection amount, and the reading should make the injection amount reach 2.5mm the time is no less than 5 groups, tests to the injection amount and stop during for (10～12.5) mm; Take load intensity as horizontal ordinate, and the injection amount is ordinate, draws load intensity and injection magnitude relation curve, calculates bearing ratio.
At least there is following shortcoming in above-mentioned prior art:
Test method needs counterforce device, detection speed slow.
The utility model content
The purpose of this utility model is to provide that a kind of detection speed is fast, the testing result quick bearing ratio detector of guide drop hammer type accurately.
The purpose of this utility model is achieved through the following technical solutions:
The quick bearing ratio detector of guide drop hammer type of the present utility model, comprise guide cylinder, in described guide cylinder, be provided with and drop hammer, described top of dropping hammer is provided with hammer stem, described hammer stem is provided with acceleration transducer, and described acceleration transducer is connected by signal wire with electronic test equipment.
The technical scheme provided by above-mentioned the utility model can be found out, the quick bearing ratio detector of the guide drop hammer type that the utility model embodiment provides, due to guide cylinder, be provided with and drop hammer in guide cylinder, the top of dropping hammer is provided with hammer stem, hammer stem is provided with acceleration transducer, acceleration transducer is connected by signal wire with electronic test equipment, during application, can at first allow dropping hammer from the certain altitude free-falling in guide cylinder, impact road bed, and draw the correlationship between described acceleration transducer signals and bearing ratio by contrast test; Then according to the correlationship between described acceleration transducer signals and bearing ratio, draw the bearing ratio of subgrade soil, detection speed is fast, testing result is accurate.
The accompanying drawing explanation
The structural representation of the quick bearing ratio detector of guide drop hammer type that Fig. 1 provides for the utility model embodiment.
In figure:
The 1-acceleration transducer, the 2-handle that drops hammer, the 3-hammer stem, the 4-electronic test equipment, the 5-register pin, the 6-guide cylinder, 7-drops hammer, 8-guide handle.
Embodiment
Below will be described in further detail the utility model embodiment.
The quick bearing ratio detector of guide drop hammer type of the present utility model, its preferably embodiment be:
Comprise guide cylinder, in described guide cylinder, be provided with and drop hammer, described top of dropping hammer is provided with hammer stem, and described hammer stem is provided with acceleration transducer, and described acceleration transducer is connected by signal wire with electronic test equipment.
The upper end of described hammer stem is provided with the handle that drops hammer, and described acceleration transducer is located at the described handle inside of dropping hammer.
Described guide cylinder is steel cylinder, and the edge of the end opening of described steel cylinder is provided with base.
The inwall suitable for reading of described steel cylinder is provided with register pin.
The outer wall of described steel cylinder is provided with the guide handle.
Apply the quick bearing ratio detector of guide drop hammer type of the present utility model, can at first allow dropping hammer from the certain altitude free-falling in guide cylinder, impact road bed, and draw the correlationship between described acceleration transducer signals and bearing ratio by contrast test; Then according to the correlationship between described acceleration transducer signals and bearing ratio, draw the bearing ratio of subgrade soil, detection speed is fast, testing result is accurate.
Specific embodiment:
As shown in Figure 1, the quick bearing ratio detector of guide drop hammer type is comprised of three parts:
(1) guide cylinder: to dropping hammer, play the guiding role, determining drops hammer pounds to the position of test surfaces and the height of drop that drops hammer.
(2) drop hammer: the quality of dropping hammer is certain value, and acceleration transducer is equipped with in inside, and the top of dropping hammer is connected with handle, and the wire that passes through of acceleration transducer is connected with electronic test equipment by handle.
(3) electronic test equipment: gather the acceleration signal that drops hammer, and automatically calculate to the received signal, process, store and show test results.
During detection, at first allow dropping hammer from the certain altitude free-falling in guide cylinder, impact road bed, and draw the correlationship between described acceleration transducer signals and bearing ratio by contrast test; Then according to the correlationship between described acceleration transducer signals and bearing ratio, draw the bearing ratio of subgrade soil.The above-mentioned soil body can be the on-the-spot soil body or the sample soil body.
The utility model carries out quick bearing-ratio test to roadbed filling and subgrade strength, reach detection speed fast, do not need counterforce device, testing result more can reflect the intensive parameter of roadbed filling under dynamic loading, can be used for detecting the bearing ratio CBR value of roadbed filling.But have advantages of that instrument is light and handy, simple to operation, detection speed is fast, accurately objective, testing result automatic printing and storage of data; Reduce the labour intensity of testing crew, improved detection efficiency.
The test philosophy of the quick bearing ratio detector of guide drop hammer type of the present utility model is:
Dropping hammer along guide cylinder from the certain altitude free-falling of fixed mass, the soil body is produced and impacts, the simultaneously reacting force of the soil body upwards resilience that makes to drop hammer, by the drop hammer acceleration of resilience of detection, and acceleration transducer signals draws corresponding CBR value with the correlationship between bearing ratio CBR.The resilience acceleration wherein dropped hammer records by the acceleration transducer be arranged in dropping hammer.
Concrete testing procedure is:
1,, at smooth test surfaces, place guide cylinder, drop hammer and electronic test equipment.
2, open electronic test equipment, prepare to start test.
3, by drop hammer lifting to specified altitude assignment, release handle makes its free-falling, drops hammer after stable and continues to carry out operation next time by previous methods, and the soil body is produced and impacts, each test result all is presented in electronic test equipment, usings the test value that impacts as test findings.
The beneficial effects of the utility model comprise:
Adopt the dynamic load mode, do not need counterforce device; Calculate soil body CBR index by the drop hammer accekeration of resilience of detection; Electronic test equipment is calculated testing result automatically, automatically calculates the CBR value; Instrument is light and handy, easy to use, simple to operate, detection speed is fast, data are accurately objective.
The above; it is only preferably embodiment of the utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement, within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claims.
Claims (5)
1. the quick bearing ratio detector of guide drop hammer type, is characterized in that, comprises guide cylinder, be provided with and drop hammer in described guide cylinder, described top of dropping hammer is provided with hammer stem, and described hammer stem is provided with acceleration transducer, and described acceleration transducer is connected by signal wire with electronic test equipment.
2. the quick bearing ratio detector of guide drop hammer type according to claim 1, is characterized in that, the upper end of described hammer stem is provided with the handle that drops hammer, and described acceleration transducer is located at the described handle inside of dropping hammer.
3. the quick bearing ratio detector of guide drop hammer type according to claim 2, is characterized in that, described guide cylinder is steel cylinder, and the edge of the end opening of described steel cylinder is provided with base.
4. the quick bearing ratio detector of guide drop hammer type according to claim 3, is characterized in that, the inwall suitable for reading of described steel cylinder is provided with register pin.
5. the quick bearing ratio detector of guide drop hammer type according to claim 4, is characterized in that, the outer wall of described steel cylinder is provided with the guide handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320452342 CN203365260U (en) | 2013-07-26 | 2013-07-26 | Rapid bearing ratio detector provided with guide cylinder and drop hammer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320452342 CN203365260U (en) | 2013-07-26 | 2013-07-26 | Rapid bearing ratio detector provided with guide cylinder and drop hammer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203365260U true CN203365260U (en) | 2013-12-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320452342 Expired - Lifetime CN203365260U (en) | 2013-07-26 | 2013-07-26 | Rapid bearing ratio detector provided with guide cylinder and drop hammer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203365260U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364294A (en) * | 2013-07-26 | 2013-10-23 | 中铁第五勘察设计院集团有限公司 | Guide-cylinder drop-hammer type rapid bearing ratio detector |
| CN110987671A (en) * | 2019-12-04 | 2020-04-10 | 北京交通大学 | Device for applying impact excitation inside soil layer of laboratory sand box |
-
2013
- 2013-07-26 CN CN 201320452342 patent/CN203365260U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364294A (en) * | 2013-07-26 | 2013-10-23 | 中铁第五勘察设计院集团有限公司 | Guide-cylinder drop-hammer type rapid bearing ratio detector |
| CN110987671A (en) * | 2019-12-04 | 2020-04-10 | 北京交通大学 | Device for applying impact excitation inside soil layer of laboratory sand box |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131225 |