CN1793774B - Benkelman beams deflectometer and method for testing differentia doflexion - Google Patents
Benkelman beams deflectometer and method for testing differentia doflexion Download PDFInfo
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- CN1793774B CN1793774B CN 200510110935 CN200510110935A CN1793774B CN 1793774 B CN1793774 B CN 1793774B CN 200510110935 CN200510110935 CN 200510110935 CN 200510110935 A CN200510110935 A CN 200510110935A CN 1793774 B CN1793774 B CN 1793774B
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Abstract
A method for detecting differential Benkelman beams deflection includes setting sub point diagauge placing unit at Benkelman beams deflectometer head, setting sub point diagauge on said unit, using telescopic rod of Benkelman beams deflectometer to replace earth device at subpoint and to ensure telescopic rod contact with earth effectively in measuring range, selecting a point to carry out Benkelman beams deflection determination according to rule, determined Benkelman beams deflection = sub point diagauge reading variation + distance between main-sub points / Benkelman beams deflectometer arm length x main point diagauge reading variation.
Description
Technical field:
The present invention relates to the field tests of road engineering quality testing, a kind of specifically benkelman beams deflectometer and the method for testing that can measure the difference flexure of concrete road surface load-bearing capacity.
Background technology:
The mensuration of difference flexure is detection concrete road surface load-bearing capacity, judges one of important indicator of whether coming to nothing at the bottom of the plate.Along with the expansion of the extensive highway foundation Facilities Construction of China, the cement concrete pavement highway obtains beyond example fast development.By to the end of the year 2002, China has had 16.8 ten thousand kilometers on cement concrete pavement highway, become and have one of maximum country of cement concrete pavement mileage in the world today, fine or not road speed, safe, the comfortable and transportation cost of directly influencing of cement concrete pavement quality.The plate seam of cement concrete pavement is more, and is comparatively responsive to overload, and disease in advance such as the road surface load-bearing capacity descends, plate comes to nothing can cause the breakage on road surface, quickens pavement quality and damages.Therefore measure principal point flexure, difference flexure before and after the plate seam, judge the plate situation of coming to nothing, for control measures such as plate rising pouring slurry provide foundation, thereby do the maintenance of cement concrete pavement well, prolong the serviceable life of highway, improve its traffic capacity, have crucial meaning.The mensuration of difference flexure is divided principal point, one group of two measuring point of auxiliary point, principal point is positioned at the preceding 10cm of plate transverse joint, adds unloading, auxiliary point is 10cm, no load (normal direction of traffic is preceding) behind transverse joint, 2 flexure difference is the difference flexure, and the difference flexure reaches a certain desired indicator can be judged as plat-bottom escape.In the prior art, the mensuration of difference deflection value normally adopts two Beckman beam benkelman beams deflectometers, measures principal point, auxiliary point deflection value respectively, needs two complete equipments and two groups of personnel, drops into bigger; Need cooperatively interact between two groups and agree, efficiency is lower; Between two groups of test achievements error is arranged respectively, the achievement error stack of difference flexure is amplified, influence the achievement precision.
Summary of the invention:
The object of the present invention is to provide a kind of method of testing that can conveniently measure the difference flexure of concrete road surface load-bearing capacity, it can overcome of the prior artly have high input, the some shortcomings of aspect such as efficient is low, precision is relatively poor.
To achieve these goals, technical scheme of the present invention is: a kind of benkelman beams deflectometer, it comprises girder, the girder support that matches with girder, dial gauge support, the principal point dial gauge that is connected with the dial gauge support, the back table pillar that is connected with the principal point dial gauge, the head landing device that is connected with the girder end, it is characterized in that: at the girder front end auxiliary point dial gauge placing device is set, lays the auxiliary point dial gauge at auxiliary point dial gauge placing device.
A kind of benkelman beams deflectometer, it comprises girder, the girder support that matches with girder, dial gauge support, the principal point dial gauge that is connected with the dial gauge support, the back table pillar that is connected with the principal point dial gauge, the head landing device that is connected with the girder front end, it is characterized in that: the head landing device that is connected with the girder front end has a horizontal segment and a vertical section, both are welded into the right angle, at the horizontal segment of landing device auxiliary point dial gauge placing device are set, and lay the auxiliary point dial gauge at auxiliary point dial gauge placing device.
A kind of method of testing differentia flexure is characterized in that the method for described testing differentia flexure may further comprise the steps: a, set up auxiliary point dial gauge placing device in the corresponding auxiliary point deflection test of benkelman beams deflectometer head position; B, lay the auxiliary point dial gauge at auxiliary point dial gauge placing device; C, substitute the auxiliary point landing device, and guarantee that the expansion link of dial gauge in test process contacts to earth in the useful range scope with the expansion link of the auxiliary point dial gauge laid; D, the selected element position is carried out flexure and is measured in accordance with regulations, specifically is the position of determining major and minor test point respectively, the position of each 10cm before and after the cement sheeting transverse joint (major and minor divide according to direction of traffic, transverse joint is preceding to be principal point, is auxiliary point behind the transverse joint); The reading of brachium * principal point dial gauge changes behind the reading variation+major-minor measuring point spacing/benkelman beams deflectometer of difference flexure=auxiliary point dial gauge that e, flexure are measured.
The present invention is by the test of cement sheeting road surface difference flexure that needing in the prior art to realize two cover benkelman beams deflectometers with the technology of settling two dial gauges on the cover benkelman beams deflectometer and just can finish, the difference deflection value of measuring 95% depends on the reading accuracy of auxiliary point dial gauge, help improving difference flexure achievement precision, use the present invention to reduce the input of personnel and equipment, the time efficiency of raising test job through experiment, and significantly improved the precision of difference deflection test achievement.
Description of drawings:
Fig. 1 is the test synoptic diagram of an embodiment of the prior art;
The test synoptic diagram of the another embodiment of Fig. 2 prior art;
Fig. 3 is the test synoptic diagram of one embodiment of the invention;
Fig. 4 is the structural representation of one embodiment of the invention.;
Fig. 5 is the A-A view sub-anatomy of Fig. 4
Fig. 6 is the structural representation of further embodiment of this invention;
Fig. 7 is that the difference flexure of one embodiment of the invention calculates synoptic diagram.
Embodiment:
Below in conjunction with drawings and Examples the present invention is further described.
The present invention is a kind of benkelman beams deflectometer, it comprises girder 4, the girder support 6 that matches with girder 4, dial gauge support 8, the principal point dial gauge 9 that is connected with dial gauge support 8, the back table pillar 7 that is connected with principal point dial gauge 9, the head landing device 5 that is connected with the girder end is characterized in that: at girder front end 14 auxiliary point dial gauge placing device 13 is set, lay auxiliary point dial gauge 12 at auxiliary point dial gauge placing device 13, the end distance of auxiliary point dial gauge placing device and girder is at least 40 centimetres.Benkelman beams deflectometer in concrete the enforcement, it comprises girder 4, the girder support 6 that matches with girder 4, dial gauge support 8, the principal point dial gauge 9 that is connected with dial gauge support 8, the back table pillar 7 that is connected with principal point dial gauge 9, the head landing device 5 that is connected with the girder front end, it is characterized in that: the head landing device 5 that is connected with girder front end 14 has a horizontal segment 18 and a vertical section 17, both are welded into the right angle, horizontal segment 18 at the head landing device is provided with auxiliary point dial gauge placing device 13, lays auxiliary point dial gauge 12 at auxiliary point dial gauge placing device 13; The end of the part of horizontal segment and girder adopts bolt to form canned paragraph 16 in the enforcement, and the length of canned paragraph is greater than 10 centimetres.The present invention is a kind of method of testing differentia flexure, and it may further comprise the steps: a, set up auxiliary point dial gauge placing device in the corresponding auxiliary point deflection test of benkelman beams deflectometer head position; B, lay the auxiliary point dial gauge at auxiliary point dial gauge placing device; C, substitute the auxiliary point landing device, and guarantee that the expansion link of dial gauge in test process contacts to earth in the useful range scope with the expansion link of the auxiliary point dial gauge laid; D, the selected element position is carried out flexure and is measured in accordance with regulations, specifically is the position of determining major and minor test point in the position of cement sheeting transverse joint 2 each 10cm of back respectively (major and minorly divide according to direction of traffic, transverse joint 2 is preceding to be principal point, is auxiliary point behind the transverse joint); The reading of brachium * principal point dial gauge changes behind the reading variation+major-minor measuring point spacing/benkelman beams deflectometer of difference flexure=auxiliary point dial gauge that e, flexure are measured.Benkelman beams deflectometer in the enforcement is a Beckman beam benkelman beams deflectometer, auxiliary point dial gauge placing device is fixed on Beckman beam benkelman beams deflectometer front end, equal the spacing of the some position of major and minor measuring point apart from the spacing of benkelman beams deflectometer head landing device, this spacing is 15-25cm, more than the length 2cm that is shorter in length than benkelman beams deflectometer head landing device of device.Be specially on the benkelman beams deflectometer girder 4 at Beckman beam benkelman beams deflectometer head landing device 5 rears auxiliary point dial gauge placing device 13 is set; The spacing of auxiliary point dial gauge placing device 13 and benkelman beams deflectometer head landing device 5 equals in the spacing accompanying drawing of major and minor some deflection test point to show with the B-C segment table and is generally about 20cm; Require during design can guarantee that the former does not touch ground in the bottom when benkelman beams deflectometer is laid more than the length 2cm that is shorter in length than benkelman beams deflectometer head landing device 5 of auxiliary point dial gauge placing device 13; The fixing means that auxiliary point dial gauge 12 and auxiliary point dial gauge placing device are 13 can adopt the notch clamping, screw is fixed or is adopted the magnet suction type to realize, preferred embodiment auxiliary point dial gauge placing device 13 adopts the magnetic devices mode, be specially with screw 15 auxiliary point dial gauge placing device 13 and girder front end 14 are fixed, auxiliary point dial gauge placing device 13 adopts steel plate material, absorption one magnet 19 in the auxiliary point dial gauge placing device 13 of steel, this magnet preferably adopts strong magnets, stick on iron plate 20 at the back side of auxiliary point dial gauge 12, not only can satisfy and lay auxiliary point dial gauge 12 easily, and can guarantee that the expansion link of dial gauge 12 contacts to earth in test process in the useful range scope; Auxiliary point dial gauge placing device 13 is placed in the benkelman beams deflectometer front end after can processing with head landing device 5 integral body, replaces dismountable original benkelman beams deflectometer head landing device 5; The reading of the reading variation+spacing of the difference flexure=auxiliary point dial gauge that tests out (marker field in the accompanying drawing is CB)/back brachium (marker field in the accompanying drawing is OD) * principal point dial gauge changes, difference deflection value 95% depends on the reading accuracy of auxiliary point dial gauge, helps improving difference flexure achievement precision.Other calculating in benkelman beams deflectometer, dial gauge, auxiliary point dial gauge and other parts and the test implementation are prior art, are not described specifically at this.
Embodiment 1:
Certain city length is that 15.2 kilometers Four-Lane Road concrete road surface highway 1 is when carrying out Reconstruction design, need whole 11680 cement sheetings are measured principal point flexure and difference flexure, test in the original plan, need to drop into two cover Beckman beam benkelman beams deflectometers and two groups totally 8 testers (not containing other support personnel) by prior art.Adopt this invention technology, with the thick band steel of 5mm be materials processing F type head device level be installed in the benkelman beams deflectometer head, two grades of horizontal steel spacing 20cm are respectively as benkelman beams deflectometer head landing device and auxiliary point dial gauge arranging device, the latter is that medium is settled auxiliary point dial gauge (the table back of the body adheres to iron plate) with the strong magnets, is responsible for the arrangement and the reading of auxiliary point dial gauge by the benkelman beams deflectometer front end personnel of putting.Realized that lineup person, a set of equipment finish original two complete equipments, two groups of personnel's test job; Simultaneously, owing to avoided phase mutual interference and the mutually wait of original two complete equipments when arranging, improve 20% on the time efficiency of operation; By ANALYSIS OF CALCULATING (in conjunction with Fig. 6 and calculation specifications thereof) to difference flexure achievement, because difference deflection value 95% depends on the reading accuracy of auxiliary point dial gauge, through experiment, the precision that the rear end dial gauge stack that two test errors of the more former scheme of achievement precision are bigger is calculated improves about 4 times.It is characterized in that: auxiliary point dial gauge placing device is set at Beckman beam benkelman beams deflectometer head; The spacing of this device and benkelman beams deflectometer head landing device equals the spacing (about 20cm) of the some position of major and minor measuring point; More than the length 2cm that is shorter in length than benkelman beams deflectometer head landing device of this device; This device can be laid dial gauge easily and guarantee that the expansion link of dial gauge contacts to earth in test process in the useful range scope; This device adds not limit man-hour with the head landing device and carries out integral body processing;
In sum, the present invention adopts the technology of settling two dial gauges on a cover benkelman beams deflectometer needing in the prior art to realize the test of the cement sheeting road surface difference flexure that two cover benkelman beams deflectometers just can finish, reduce the input of personnel and equipment, the time efficiency of raising test job, and can improve the precision of difference deflection test achievement.
Claims (4)
1. the method for a testing differentia flexure, it is characterized in that: the method for described testing differentia flexure may further comprise the steps: a, set up auxiliary point dial gauge placing device in the corresponding auxiliary point deflection test of benkelman beams deflectometer head position; B, lay the auxiliary point dial gauge at auxiliary point dial gauge placing device; C, substitute the auxiliary point landing device, and guarantee that the expansion link of dial gauge in test process contacts to earth in the useful range scope with the expansion link of the auxiliary point dial gauge laid; D, the selected element position is carried out flexure and is measured in accordance with regulations; The reading of brachium * principal point dial gauge changes behind the reading variation+major-minor measuring point spacing/benkelman beams deflectometer of difference flexure=auxiliary point dial gauge that e, flexure are measured; Described benkelman beams deflectometer comprises girder, the girder support that matches with girder, the dial gauge support, the principal point dial gauge that is connected with the dial gauge support, the back table pillar that is connected with the principal point dial gauge, the head landing device that is connected with the girder front end, the head landing device that is connected with the girder front end has a horizontal segment and a vertical section, both are welded into the right angle, horizontal segment at landing device is provided with auxiliary point dial gauge placing device, lay the auxiliary point dial gauge at auxiliary point dial gauge placing device, the part of horizontal segment and the end of girder adopt bolt to form canned paragraph, and the length of canned paragraph is greater than 10 centimetres.
2. the method for a kind of testing differentia flexure according to claim 1, it is characterized in that: benkelman beams deflectometer is a Beckman beam benkelman beams deflectometer, auxiliary point dial gauge placing device is fixed on Beckman beam benkelman beams deflectometer front end, equal the spacing of the some position of major and minor measuring point apart from the spacing of benkelman beams deflectometer head landing device, this spacing is 15-25cm, more than the length 2cm that is shorter in length than benkelman beams deflectometer head landing device vertical section of auxiliary point dial gauge placing device.
3. the method for a kind of testing differentia flexure according to claim 1 and 2 is characterized in that: the fixing means between auxiliary point dial gauge and auxiliary point dial gauge placing device can adopt notch clamping, screw to fix or adopt the magnet suction type to realize.
4. the method for a kind of testing differentia flexure according to claim 1 and 2 is characterized in that: auxiliary point dial gauge placing device carries out integral body and is processed to form integral body adding man-hour and head landing device, and the overall fixed after the processing is in the benkelman beams deflectometer front end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510110935 CN1793774B (en) | 2005-11-29 | 2005-11-29 | Benkelman beams deflectometer and method for testing differentia doflexion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510110935 CN1793774B (en) | 2005-11-29 | 2005-11-29 | Benkelman beams deflectometer and method for testing differentia doflexion |
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| Publication Number | Publication Date |
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| CN1793774A CN1793774A (en) | 2006-06-28 |
| CN1793774B true CN1793774B (en) | 2010-10-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103074845B (en) * | 2013-01-10 | 2015-06-24 | 长安大学 | Rigid pavement deflection test device and test method thereof |
| CN104406507A (en) * | 2014-11-28 | 2015-03-11 | 哈尔滨电机厂有限责任公司 | Stator curve and sinkage measuring method used in 1000MW generator stator transporting and closing process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86206378U (en) * | 1986-08-22 | 1987-09-02 | 施大年 | Tester for bending and subsiding characteristics of pavement under static load |
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- 2005-11-29 CN CN 200510110935 patent/CN1793774B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86206378U (en) * | 1986-08-22 | 1987-09-02 | 施大年 | Tester for bending and subsiding characteristics of pavement under static load |
Non-Patent Citations (1)
| Title |
|---|
| 施大年.路面弯沉测量技术的改进.公路.1988,27-31. * |
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