CN2869109Y - Portable drop hammer benkelman beams deflectometer - Google Patents
Portable drop hammer benkelman beams deflectometer Download PDFInfo
- Publication number
- CN2869109Y CN2869109Y CN 200520128740 CN200520128740U CN2869109Y CN 2869109 Y CN2869109 Y CN 2869109Y CN 200520128740 CN200520128740 CN 200520128740 CN 200520128740 U CN200520128740 U CN 200520128740U CN 2869109 Y CN2869109 Y CN 2869109Y
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- China
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- fixed
- loaded plate
- rebound
- displacement transducer
- bearing frame
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- Expired - Lifetime
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A portable drop hammer deflectometer comprises a releasing organ, a round weight dropper, an upper guide bar, a lower guide bar, a bearing plate, a bearing frame, a transition plate, a buffer gasket, a force transducer, displacement transducer, a temperature transducer, a signal collection and treatment system and an auxiliary measuring deflection device. The weight dropper freely falls down along the guide bar, while the output signals of the force transducer and the displacement transducer are transmitted into the treatment system through data collecting to draw the deflection basin curve with the center of drop hammer point and calculate the largest impact force and the largest deflection of each point and the parameter of resilient modulus of the road surface. The split guide bar, independent auxiliary measuring deflection device and the displacement transducer with special structure enable the utility model to be convenient for carrying, high in measuring precision and stable and reliable in measuring value.
Description
Technical field
The utility model relates to a kind of pavement deflection checkout gear, especially a kind of drop hammer type pavement deflection checkout gear.
Background technology
Recent two decades comes, and Dynamic Non-Destruction Measurement research and development in road surface is subjected to increasingly extensive attention at home and abroad.Flexure is as most important road structure status evaluation index, and its measureing equipment and analytical technology development are very fast.Since nineteen fifty-three invention beam type benkelman beams deflectometer, the pavement deflection checkout equipment has developed into the Falling Weight Deflectometer (FWD) of simulation driving loading from the static(al) benkelman beams deflectometer, develop into the test of road pavement deflection basin from the maximum deflection test of single-point, and will be confined to flexure concept development on the flexible pavement meaning among the structure evaluation and design analysis of rigid pavement.The sixties in 20th century, France at first proposes the preliminary imagination of drop hammer type Dyna-Flex machine, the later stage seventies Denmark and Sweden at first be developed into FWD, since the eighties, FWD has obtained increasingly extensive application at home and abroad.
Hammer-falling deflectometer can the simulating actual conditions road pavement apply dynamic load, measures the multiple spot flexure exactly, is fit to long distance, METHOD FOR CONTINUOUS DETERMINATION.Its basic principle is that the weight by certain mass freely falls loaded plate with certain rigidity of hammering and acts on the road surface, the displacement transducer that passes through the power sensor then and arrange is at a certain distance measured suffered impact force and the deformation response of road table, i.e. deflection basin.Thereby can be according to the modulus of these each layers of data inverse road structure, as the foundation of road pavement bulk strength evaluation.Hammer-falling deflectometer is safe in utilization, test fast, save manpower, contain much information, measurement result is more accurate.Yet, many shortcomings that the various Falling Weight Deflectometer of various countries' development at present also exist, as: data stability is poor, because the measure error that systematic error causes is big, and transportation inconvenience, poor practicability etc.
The utility model content
The purpose of this utility model be to provide a kind of volume little, in light weight, be easy to carry, portable falling weight deflectometer that certainty of measurement is high.Can be applicable to measurement of highway pavement flexure and highway, railway, airport and industry and civilian construction bearing capacity of foundation soil detects.
The utility model provides a kind of portable falling weight deflectometer, is made up of relieving mechanism, circular weight, guide peg, bogey, measuring system and auxiliary flexure measurement mechanism.Relieving mechanism can be fixed on the guide peg according to the falling head of weight.Bogey is made up of loaded plate, bearing frame, rebound and cushion pad.Bearing frame is fixed on the loaded plate, and the power sensor connects by screw between bearing frame and rebound.Cushion pad then is fixed on the rebound.Guide peg is by forming by the upper and lower guide peg that is threaded.Following guide peg passes weight and rebound, is vertically fixed on the bearing frame.Measuring system is made up of power sensor, displacement transducer, temperature pick up and the signals collecting and the treatment system that are fixed on the bearing frame.Wherein, the centre bit displacement sensor is fixed on loaded plate central authorities, and its probe passes the centre bore of loaded plate, can measure the displacement of loaded plate central point.Other displacement transducer is fixed on the independently auxiliary flexure measurement mechanism.Auxiliary flexure measurement mechanism by crossbeam, be fixed on displacement transducer on the crossbeam center line, be used to adjust three screw rods, the leveling bubble of crossbeam level and the alignment pin that plays the role of positioning is formed.Three screw rods are axis fixed-site triangular in shape with the crossbeam.Auxiliary flexure measurement mechanism is determined relative position between itself and the bogey by alignment pin with near two screw rods of bogey.Also can according to the actual requirements a plurality of displacement transducers be installed on crossbeam.In measuring process, auxiliary flexure measurement mechanism and benkelman beams deflectometer main body do not have any influence each other without any contacting, and have reduced systematic error, have improved the certainty of measurement of deflection basin.In addition, independently auxiliary flexure measurement mechanism is easy to carry convenient transportation.
The centre bit displacement sensor has identical structure with displacement transducer on the auxiliary flexure measurement mechanism, all is made up of the elastic damping between shell, displacement transducer main body, probe and shell upper and lower side and the sensor main body.Probe is installed in the center of displacement transducer bottom part body, and stretches out outside the housing by the centre bore of outer casing bottom.Thereby sensor main body and whole system are kept apart, reduced the influence of system vibration and surrounding environment, reduced systematic error, improved certainty of measurement measurement result.In addition, the centre bore that the probe of centre bit displacement sensor passes loaded plate stretches out loaded plate, can detect the displacement signal of loaded plate central point exactly.The real-time measures ambient temperature of temperature pick up is used for the temperature correction to deflection value.
Description of drawings
Fig. 1 is the portable falling weight deflectometer structural representation;
Fig. 2 is the displacement sensor structure schematic diagram.
Wherein: the 1-top guide bar; The 2-relieving mechanism; The circular weight of 3-; The 4-lower guide rod; The 5-cushion pad; The 6-rebound; The 7-bearing frame; The 8-loaded plate; 9-power sensor; 10-centre bit displacement sensor; The 11-temperature pick up; The 12-alignment pin; The 13-spring; 14-level-off screw rod; The 15-displacement transducer; The 16-crossbeam; 17-leveling bubble; The 18-holding wire; The 19-sensor outer housing; The 20-sensor main body; The 21-elastic damping; The 22-probe.
The specific embodiment
Upper and lower guide peg can be dismantled at any time, is easy to carry.Cushion pad 5 is made up of three rubber columns, and they are that the center evenly is fixed on the rebound 6 with the guide rod.Before road pavement is measured, at first weight 3 is enclosed within down on the guide peg 4, connect guide peg up and down, subsidiary flexure device is placed on the prescribed direction of bogey, alignment pin 12 is inserted in the locating hole of loaded plates 8, and with the relative position of determining subsidiary flexure device and bogey near two screw rods of bogey.Alignment pin can make subsidiary flexure device can any contact do not arranged with bogey because the effect of spring 13 returns to original position, does not have any influence each other, thereby has reduced the systematic error of benkelman beams deflectometer.And the two is separately also easy to carry and transport.Three level-off screw rods 14 that utilize leveling bubble 17 to adjust on the crossbeam 16 make the crossbeam level, and make that certain precompression is arranged between sensor probe and the road surface.
During measurement, manually weight is fixed on the releasing device, allow weight along the guide rod free-falling, the signal of power sensor 9, temperature pick up 11 and displacement transducer 10,15 outputs is through signals collecting and treatment system, finally drawing to drop hammer a little is the deflection basin curve at center, and calculate maximum impact force and the maximum flexure of each point, and the parameters such as modulus of elasticity on this road surface.
Claims (7)
1, a kind of portable falling weight deflectometer, form by relieving mechanism, circular weight, guide peg, bogey, measuring system, it is characterized in that: following guide peg (4) passes weight (3), cushion pad (5) and rebound (6), is vertically fixed on the bearing frame (7); Relieving mechanism (2) is fixed on the guide peg (1) according to the falling head of weight (3); Bearing frame (7) is fixed on the loaded plate (8); Power sensor (9) is between bearing frame (7) and rebound (6); Cushion pad (5) is fixed on the rebound (6); Centre bit displacement sensor (10) is fixed on loaded plate (8) central authorities; Temperature pick up (11) is fixed on the loaded plate (8).
2, portable falling weight deflectometer according to claim 1 is characterized in that: go up by alignment pin (12) at loaded plate (8) and be connected with auxiliary flexure measurement mechanism; Auxiliary flexure measurement mechanism is made up of crossbeam (16), the displacement transducer (15), level-off screw rod (14) and the leveling bubble (17) that are fixed on the crossbeam.
3, portable falling weight deflectometer according to claim 1 and 2 is characterized in that: guide peg is made up of dismountable top guide bar (1) and lower guide rod (4).
4, portable falling weight deflectometer according to claim 1 and 2 is characterized in that: bogey is by circular loaded plate (8), form at the bearing frame on the loaded plate (7), rebound (6) and the cushion pad (5) that is fixed on the rebound by screw; Cushion pad is made up of three rubber columns; Place power sensor (9) between bearing frame (7) and the rebound (6).
5, portable falling weight deflectometer according to claim 1 and 2 is characterized in that: the centre bit displacement sensor by shell (19), displacement transducer main body (20), be positioned at probe (22) on the displacement transducer main center line and the elastic damping (21) between the shell upper and lower side is formed.
6, portable falling weight deflectometer according to claim 5 is characterized in that: the probe of centre bit displacement sensor (22) stretches out loaded plate by the centre bore of loaded plate (8).
7, portable falling weight deflectometer according to claim 1 and 2 is characterized in that: the displacement transducer on the auxiliary flexure measurement mechanism has identical structure with the centre bit displacement sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520128740 CN2869109Y (en) | 2005-12-30 | 2005-12-30 | Portable drop hammer benkelman beams deflectometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520128740 CN2869109Y (en) | 2005-12-30 | 2005-12-30 | Portable drop hammer benkelman beams deflectometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2869109Y true CN2869109Y (en) | 2007-02-14 |
Family
ID=37724043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520128740 Expired - Lifetime CN2869109Y (en) | 2005-12-30 | 2005-12-30 | Portable drop hammer benkelman beams deflectometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2869109Y (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466598A (en) * | 2010-11-15 | 2012-05-23 | 北京航天计量测试技术研究所 | Multipoint sensor FWD (Falling Weight Deflectometer) |
| CN103698495A (en) * | 2012-09-28 | 2014-04-02 | 北京航天计量测试技术研究所 | Load transmission capacity measurement device for concrete pavement joint |
| CN104451077A (en) * | 2014-11-04 | 2015-03-25 | 华东理工大学 | Device and method for improving structural integrity of safety valve in pre-impacting manner |
| WO2015051798A1 (en) * | 2013-10-11 | 2015-04-16 | Dynatest International A/S | Falling weight deflectometer |
| CN105547868A (en) * | 2015-12-30 | 2016-05-04 | 中北大学 | Drop hammer structural design based on stress concentration principle and test method thereof |
| CN104451077B (en) * | 2014-11-04 | 2017-01-04 | 华东理工大学 | A kind of pre-impact improves the device and method of safety valve structure integrity |
| RU167850U1 (en) * | 2016-08-19 | 2017-01-20 | Федеральное государственное унитарное предприятие "Центральный аэрогидродинамический институт имени профессора Н.Е. Жуковского" (ФГУП "ЦАГИ") | Device for measuring dent parameters |
| CN108138453A (en) * | 2015-10-07 | 2018-06-08 | 卡特彼勒路面机械公司 | Calibrate the conveyer scaling system of cold milling and planing machine |
| CN108842577A (en) * | 2018-06-20 | 2018-11-20 | 成都圭目机器人有限公司 | A kind of detection device of integrated benkelman beams deflectometer mobile platform |
| CN109632534A (en) * | 2018-12-19 | 2019-04-16 | 安徽省骏腾工程试验检测有限公司 | A kind of electronic hammer-falling deflectometer of trailer-type |
| CN112858047A (en) * | 2021-02-10 | 2021-05-28 | 郑州东辰科技有限公司 | Drop hammer type deflection measuring device |
| CN113029827A (en) * | 2021-02-10 | 2021-06-25 | 郑州东辰科技有限公司 | South-to-north water transfer is underwater with weight formula deflection measuring device that falls |
| CN113106822A (en) * | 2021-04-17 | 2021-07-13 | 南京熙赢测控技术有限公司 | Harmful vibration isolation system and method for drop hammer type deflectometer |
-
2005
- 2005-12-30 CN CN 200520128740 patent/CN2869109Y/en not_active Expired - Lifetime
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466598B (en) * | 2010-11-15 | 2014-06-18 | 北京航天计量测试技术研究所 | Multipoint sensor FWD (Falling Weight Deflectometer) |
| CN102466598A (en) * | 2010-11-15 | 2012-05-23 | 北京航天计量测试技术研究所 | Multipoint sensor FWD (Falling Weight Deflectometer) |
| CN103698495A (en) * | 2012-09-28 | 2014-04-02 | 北京航天计量测试技术研究所 | Load transmission capacity measurement device for concrete pavement joint |
| WO2015051798A1 (en) * | 2013-10-11 | 2015-04-16 | Dynatest International A/S | Falling weight deflectometer |
| CN104451077A (en) * | 2014-11-04 | 2015-03-25 | 华东理工大学 | Device and method for improving structural integrity of safety valve in pre-impacting manner |
| CN104451077B (en) * | 2014-11-04 | 2017-01-04 | 华东理工大学 | A kind of pre-impact improves the device and method of safety valve structure integrity |
| CN108138453A (en) * | 2015-10-07 | 2018-06-08 | 卡特彼勒路面机械公司 | Calibrate the conveyer scaling system of cold milling and planing machine |
| CN105547868A (en) * | 2015-12-30 | 2016-05-04 | 中北大学 | Drop hammer structural design based on stress concentration principle and test method thereof |
| CN105547868B (en) * | 2015-12-30 | 2018-08-17 | 中北大学 | The method of the structured testing impact force that drops hammer based on stress concentration principle |
| RU167850U9 (en) * | 2016-08-19 | 2017-04-18 | Федеральное государственное унитарное предприятие "Центральный аэрогидродинамический институт имени профессора Н.Е. Жуковского" (ФГУП "ЦАГИ") | Device for measuring dent parameters |
| RU167850U1 (en) * | 2016-08-19 | 2017-01-20 | Федеральное государственное унитарное предприятие "Центральный аэрогидродинамический институт имени профессора Н.Е. Жуковского" (ФГУП "ЦАГИ") | Device for measuring dent parameters |
| CN108842577A (en) * | 2018-06-20 | 2018-11-20 | 成都圭目机器人有限公司 | A kind of detection device of integrated benkelman beams deflectometer mobile platform |
| CN109632534A (en) * | 2018-12-19 | 2019-04-16 | 安徽省骏腾工程试验检测有限公司 | A kind of electronic hammer-falling deflectometer of trailer-type |
| CN112858047A (en) * | 2021-02-10 | 2021-05-28 | 郑州东辰科技有限公司 | Drop hammer type deflection measuring device |
| CN113029827A (en) * | 2021-02-10 | 2021-06-25 | 郑州东辰科技有限公司 | South-to-north water transfer is underwater with weight formula deflection measuring device that falls |
| CN113029827B (en) * | 2021-02-10 | 2023-08-25 | 郑州东辰科技有限公司 | South-to-north water is under water with falling hammer formula deflection measuring device |
| CN112858047B (en) * | 2021-02-10 | 2023-08-25 | 郑州东辰科技有限公司 | Drop hammer type deflection measuring device |
| CN113106822A (en) * | 2021-04-17 | 2021-07-13 | 南京熙赢测控技术有限公司 | Harmful vibration isolation system and method for drop hammer type deflectometer |
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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 |
Granted publication date: 20070214 |
|
| EXPY | Termination of patent right or utility model |