CN202073124U - Handheld type drop hammer deflectometer - Google Patents
Handheld type drop hammer deflectometer Download PDFInfo
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- CN202073124U CN202073124U CN2011200897714U CN201120089771U CN202073124U CN 202073124 U CN202073124 U CN 202073124U CN 2011200897714 U CN2011200897714 U CN 2011200897714U CN 201120089771 U CN201120089771 U CN 201120089771U CN 202073124 U CN202073124 U CN 202073124U
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- pressure sensor
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Abstract
The utility model relates to a handheld type drop hammer deflectometer which is provided with a base, wherein a bearing plate with a plane bottom surface is fixed under the base; a displacement sensor which is connected with the base is arranged on the base; a pressure sensor is arranged on the displacement sensor; a rubber cushion block is arranged on the pressure sensor; a sliding rod passes through the rubber cushion block, the pressure sensor and the displacement sensor to be connected with the base; a drop hammer is stringed on the sliding rod above the rubber cushion block; a locking rod is arranged at the upper end of the sliding rod and is used for fixing and releasing the drop hammer; the handheld type drop hammer deflectometer is also provided with a data acquiring and transmitting device and a computer; signals obtained by the displacement sensor and the pressure sensor are output to the data acquiring and transmitting device; the data acquiring and transmitting device outputs the received signals to the computer; and a power source is arranged in the base and is used for the computer.
Description
Technical field
The utility model belongs to road foundation engineering field, is specifically related to a kind of hand-held hammer-falling deflectometer.
Background technology
Roadbed is the basic structure of highway, is the basis of supporting road structure, and with the effect that traffic load is born on the road surface jointly, traffic load reaches roadbed by road structure, and the stress-strain characteristics of roadbed plays an important role to the bulk strength and the rigidity of road structure.In the distortion of road structure, the distortion of roadbed accounts for 70%～90%.Improper by the roadbed quality control, cause a series of diseases easily, have a strong impact on the quality and the life-span of road.Therefore, in the construction of high-grade highway, the effective fast detecting of the matrix of satisfying the need amount is estimated most important, and strict control roadbed quality assurance highway is long-term, the purpose of safe operation thereby reach.
At present, the compaction quality of roadbed mainly reflects by several indexs such as degree of compaction, the modulus of resilience and deflection values, domestic mainly detect by degree of compaction and deflection value detects the evaluation of carrying out the subgrade compaction quality.There is the shortcoming of following two aspects in these methods: (1) degree of compaction and deflection value all are the physical indexs that detects, and the direct deliberated index of subgrade compaction quality should be more definite with mechanical index; Shortcomings such as (2) detection time is long, accuracy is not high, plant and instrument complicated operation, detection cost height can not well carry out comprehensively, estimate fast and accurately workmanship, are difficult to catch up with the construction speed of highway, influence construction speed.Therefore, the checkout equipment test that research is a kind of fast, accurate, efficient is high is the present task of top priority.
Summary of the invention
The purpose of this utility model is to provide a kind of hand-held hammer-falling deflectometer (PFWD), and this hand-held hammer-falling deflectometer can be judged the supporting capacity and the integrated carrying ability of each compacted lift of roadbed fast, and evaluation index is a modulus of resilience value.
The technical scheme that realizes the utility model purpose is: the hand-held hammer-falling deflectometer, be provided with base, below base, be fixed with the loaded plate that the bottom surface is the plane, be provided with the displacement transducer that is connected with base above the base, be provided with pressure sensor above the displacement transducer, be provided with rubber cushion blocks above the pressure sensor, slide bar passes rubber cushion blocks, pressure sensor and displacement transducer and is connected with base, drop hammer string on the slide bar above the rubber cushion blocks, upper end at slide bar also is provided with securing rod, is used for fixing and release is dropped hammer; The hand-held hammer-falling deflectometer also is provided with data acquisition and transmitting device and computer, and the signal that displacement transducer and pressure sensor obtain exports data acquisition and transmitting device to, and data acquisition and transmitting device transfer to computer with the signal of receiving; In base, be provided with power supply, use for computer.
Securing rod described in the technique scheme can be latch or snap close.
As further improvement of the utility model, the top of described slide bar is provided with handle, is easy to carry and operates.
As further improvement of the utility model, described slide bar is divided into detachable and drop shot that is connected and upper slide bar, is convenient to assembling and the hand-held hammer-falling deflectometer is split transportation.
As a further improvement on the present invention, described data acquisition and transmitting device adopt Wireless transmission mode and compunication.
The hand-held hammer-falling deflectometer requires when being used for the performance rating of each layer of roadbed fill compaction: a cubic metre of earth roadbed should be according to design section, placement in layers, compaction in layers, and the compacted depth of layering should not surpass 20cm.After every layer of fill compaction finishes, adopt the hand-held hammer-falling deflectometer to inspect by random samples, inspection frequency is that one of per 10～20m detects section, and each section guarantees at least one test point of each track.The subgrade construction paragraph more in short-term, layered backfill quality control requirement actual sample number is no less than 6 points, can increase check point as required in case of necessity.
Each measuring point modulus of resilience typical value E (the following fiducial limit of arithmetic mean of instantaneous value) is in the test evaluation section:
In the formula: E---each measuring point modulus of resilience typical value in the test evaluation section;
E
i---the average of each measuring point modulus of resilience in the test evaluation section;
t
α---the coefficient that becomes with measuring point number and fraction (or confidence level) in the t distribution table;
S---the standard deviation of a measuring point detected value in the evaluation highway section;
N---detect and count;
E
0---modulus of resilience design load, relevant with factors such as soil condition, weather conditions, also the correlation inverse of indexs such as PFWD that can obtain by field trial and flexure, degree of compaction is determined.
Beneficial effect
PFWD is relative, and traditional detection method has clear superiority:
(1) at first from test speed, testing efficiency height of the present utility model.The construction of highway at present is in the developing period of a high speed, and task weighs, is pressed for time, and therefore man-hour and the operating efficiency for the subgrade compaction quality examination all proposed higher requirement.When utilizing hand-held hammer-falling deflectometer (PFWD) test subgrade compaction quality, instrumentation is simple relatively, testing time is short, as shown in table 1, and not limited by the place, can satisfy present highway construction to the higher requirement that testing proposes, be more suitable for the big workload fast detecting of highway subgrade degree of compaction on a large scale.
Contrast detection time of table 1 various device
(2) from measuring accuracy, it is less that the utility model is influenced by human factor.Hand-held hammer-falling deflectometer (PFWD) data variation is little, and the precision of detection can be used to test the subgrade compaction quality.
Hand-held hammer-falling deflectometer (PFWD) improves test job efficient, guarantees workmanship, for design, construction and maintenance provide reliable foundation, thereby reduces the life-cycle investment application life of improving engineering.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment 1.
The specific embodiment
Be described further below in conjunction with embodiment and accompanying drawing.
As shown in Figure 1, hand-held hammer-falling deflectometer 100, be provided with base 1, being fixed with the bottom surface below base 1 is the loaded plate 2 on plane, be provided with the displacement transducer 3 that is connected with base above the base 1, be provided with pressure sensor 4 above the displacement transducer 3, be provided with rubber cushion blocks 5 above the pressure sensor 3, drop shot 51 passes rubber cushion blocks 5, pressure sensor 4 and displacement transducer 3 and is connected with base 1, drop shot 61 and 62 detachable connections of upper slide bar.Drop hammer 9 strings on drop shot above the rubber cushion blocks 5 61 and upper slide bar 62, also be provided with latch 7, be used for fixing and release drops hammer 9 in the upper end of upper slide bar 62.Hand-held hammer-falling deflectometer 100 also is provided with data acquisition and transmitting device 8 and computer 10, the signal that displacement transducer 3 and pressure sensor 4 obtain exports data acquisition and transmitting device 8 to, data acquisition and transmitting device with the signal of receiving after, by being wirelessly transmitted to computer 10; In base 1, be provided with power supply, use for computer.Be provided with handle 11 on the top of upper slide bar 62.
The use of hand-held hammer-falling deflectometer 100 is as follows:
(1) installation of PFWD
1. according to the type selecting loaded plate of measuring object, but reference table 2.
The corresponding relation of table 2 material and loaded plate
| The loaded plate of recommending | Material type |
| Φ100 | Roadbed material (laboratory test), the hard road structure |
| Φ200 | The unconfinement bottom, the stone bottom |
| Φ300 | Roadbed, backfill, basic unit, unconfinement layer |
2. with hex(agonal)screw loaded plate is fixed on the base;
3. clockwise rotate drop shot, be screwed on the master unit, and with hand-tight solid;
4. be put on the drop shot dropping hammer carefully, up to supporting with rubber bumper;
5. drop shot and upper slide bar are tightened, handle is installed on the upper slide bar also fastening;
(2) PFWD and computer is connected
1. PRIMA 100 softwares are installed on computers;
2. connect PFWD and computer by data line;
3. No. 5 batteries of 4 joints are packed into the battery casket of PFWD base;
4. open the PFWD data acquisition program on the computer;
5. confirm that PFWD and computer are to be connected, its redness that is masked as the lower right corner of application program connects pattern and becomes green;
(3) check before the test of PFWD
1. check the battery charge situation of computer and PFWD, guarantee that battery correctly is inserted in the battery case;
Whether the transmission line of 2. checking computer and PFWD base connects;
3. check whether 5 screws that are used for fixing the PFWD loaded plate all are installed on the base, to guarantee the correctness of detected value.
(4) test procedure
Carry out after installation and the inspection work, the point that selection will be surveyed moves on to testing location with PFWD and detects.
1. the road bed of placing loaded plate should be smooth, as out-of-flatness, can use some sands to make loaded plate entire contact surface assurance level;
2. parameter is set among the SETUP on the data acquisition program interface: the initial number of measuring point, open automatic numeration button, the path of the input road section information and the file of depositing etc.Application program is the time of record test automatically;
3. weight is carried to level altitude (height is set according to the character and the compaction of roadbed filling, falls apart from minimum about 39cm, the most about 82cm);
4. check drop hammer and rubber buffer between without any thing, as hand, pin or instrument etc.;
5. press the latch that fixedly drops hammer, dropping hammer freely falls, and impacts the PFWD base, records pressure, flexure, attack time and modulus of resilience value;
6. when same point detected, the first hammer data that obtain were because instability is not useable for the data processing.A general measuring point will be surveyed 3～5 times, to obtain stable testing result;
7. if data are reasonable, click the SAVE key, preserve test data, otherwise click the CANCEL key, the cancellation operation.Table 3 shows the expectation numerical value of various material bullet moulds;
The bullet mould expectation numerical value of table 3 material
| Material | The expectation measurement category |
| Subsoil | 560MPa |
| Basic unit | 2575MPa |
8. in the data acquisition, the deflection value of any loaded plate that shows in the form on the screen picture should be above 2000 microns.If surpassed 2000 microns, then should select bigger loaded plate or reduce height of the fall.
9. as the E that calculates with the center wave detector
0When overstepping the extreme limit, just need change loaded plate according to table 4:
The corresponding relation of table 4 material and loaded plate
| The E that the center wave detector calculates 0 | The loaded plate diameter of recommending |
| 0～125MPa | Φ300 |
| Surpass 125MPa | Φ200 |
| Surpass 175MPa | Φ100 |
10. after the measuring point test is finished, the data file of this point is preserved.In the REMARKS of computer item, be rewritten as the pile No. of any down.PFWD is put on the towing dolly, shifts to next test point, repeat above test process.In the process that moves, program needn't be closed.If wanting to stop to detect, on having preserved, after the detection data of a bit, click the CLOSE key;
(5) data acquisition and processing
In the PFWD process of the test, by transmission line pressure and the shift value that collects is transferred to computer, computer program is handled the data that collect automatically, and provides modulus of resilience value.
Claims (5)
1. hand-held hammer-falling deflectometer, it is characterized in that, described hand-held hammer-falling deflectometer is provided with base, below base, be fixed with the loaded plate that the bottom surface is the plane, be provided with the displacement transducer that is connected with base above the base, be provided with pressure sensor above the displacement transducer, be provided with rubber cushion blocks above the pressure sensor, slide bar passes rubber cushion blocks, pressure sensor and displacement transducer and is connected with base, drop hammer string on the slide bar above the rubber cushion blocks, upper end at slide bar also is provided with securing rod, is used for fixing and release is dropped hammer; The hand-held hammer-falling deflectometer also is provided with data acquisition, transmitting device and computer, and the signal that displacement transducer and pressure sensor obtain exports data acquisition and transmitting device to, and data acquisition and transmitting device transfer to computer with the signal of receiving; In base, be provided with power supply, use for computer.
2. hand-held hammer-falling deflectometer according to claim 1 is characterized in that, described securing rod is latch or snap close.
3. hand-held hammer-falling deflectometer according to claim 1 is characterized in that the top of described slide bar is provided with handle.
4. hand-held hammer-falling deflectometer according to claim 1 is characterized in that, described slide bar is divided into detachable and drop shot that is connected and upper slide bar.
5. hand-held hammer-falling deflectometer according to claim 1 is characterized in that, described data acquisition and transmitting device adopt Wireless transmission mode and compunication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200897714U CN202073124U (en) | 2011-03-30 | 2011-03-30 | Handheld type drop hammer deflectometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200897714U CN202073124U (en) | 2011-03-30 | 2011-03-30 | Handheld type drop hammer deflectometer |
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| Publication Number | Publication Date |
|---|---|
| CN202073124U true CN202073124U (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200897714U Expired - Lifetime CN202073124U (en) | 2011-03-30 | 2011-03-30 | Handheld type drop hammer deflectometer |
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| Country | Link |
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| CN (1) | CN202073124U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102953313A (en) * | 2012-10-26 | 2013-03-06 | 中国水电建设集团路桥工程有限公司 | Method for monitoring graded broken stone segregation |
| CN103728190A (en) * | 2013-12-30 | 2014-04-16 | 华侨大学 | Multi-angle drop-hammer impact testing device and test bench thereof |
| CN103774512A (en) * | 2014-02-18 | 2014-05-07 | 中铁第五勘察设计院集团有限公司 | Dynamic ballast bed support rigidity detection instrument and detection method |
| CN105203420A (en) * | 2015-10-29 | 2015-12-30 | 长安大学 | Device and method for rapidly measuring drop hammer type cement stabilized base compactness |
| CN105486633A (en) * | 2015-12-31 | 2016-04-13 | 华测检测认证集团股份有限公司 | Textile seam strength testing system |
| CN111829911A (en) * | 2020-07-14 | 2020-10-27 | 北京建筑材料科学研究总院有限公司 | Performance measuring device for filling leveling layer on floating ground |
| CN112986015A (en) * | 2021-01-29 | 2021-06-18 | 郭清彬 | Building engineering quality detector |
| CN114152506A (en) * | 2021-11-26 | 2022-03-08 | 广州广电计量检测股份有限公司 | Tensile experimental apparatus of medium strain rate |
-
2011
- 2011-03-30 CN CN2011200897714U patent/CN202073124U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102953313A (en) * | 2012-10-26 | 2013-03-06 | 中国水电建设集团路桥工程有限公司 | Method for monitoring graded broken stone segregation |
| CN102953313B (en) * | 2012-10-26 | 2016-10-12 | 中国水电建设集团路桥工程有限公司 | A kind of monitoring method of graded broken stone isolation |
| CN103728190A (en) * | 2013-12-30 | 2014-04-16 | 华侨大学 | Multi-angle drop-hammer impact testing device and test bench thereof |
| CN103728190B (en) * | 2013-12-30 | 2016-05-18 | 华侨大学 | A kind of multi-angle drop impact device and testing stand thereof |
| CN103774512A (en) * | 2014-02-18 | 2014-05-07 | 中铁第五勘察设计院集团有限公司 | Dynamic ballast bed support rigidity detection instrument and detection method |
| CN105203420A (en) * | 2015-10-29 | 2015-12-30 | 长安大学 | Device and method for rapidly measuring drop hammer type cement stabilized base compactness |
| CN105203420B (en) * | 2015-10-29 | 2018-01-02 | 长安大学 | Drop hammer type cement treated material device for rapidly determining compaction degree and assay method |
| CN105486633A (en) * | 2015-12-31 | 2016-04-13 | 华测检测认证集团股份有限公司 | Textile seam strength testing system |
| CN111829911A (en) * | 2020-07-14 | 2020-10-27 | 北京建筑材料科学研究总院有限公司 | Performance measuring device for filling leveling layer on floating ground |
| CN112986015A (en) * | 2021-01-29 | 2021-06-18 | 郭清彬 | Building engineering quality detector |
| CN114152506A (en) * | 2021-11-26 | 2022-03-08 | 广州广电计量检测股份有限公司 | Tensile experimental apparatus of medium strain rate |
| CN114152506B (en) * | 2021-11-26 | 2023-11-03 | 广电计量检测集团股份有限公司 | Tensile experimental apparatus of medium strain rate |
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| CX01 | Expiry of patent term |