CN111424507B - Deflection beam for deflection value dynamic measurement and road deflection value dynamic measurement device - Google Patents
Deflection beam for deflection value dynamic measurement and road deflection value dynamic measurement device Download PDFInfo
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- CN111424507B CN111424507B CN202010216156.9A CN202010216156A CN111424507B CN 111424507 B CN111424507 B CN 111424507B CN 202010216156 A CN202010216156 A CN 202010216156A CN 111424507 B CN111424507 B CN 111424507B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs
Abstract
The invention relates to a deflection beam for dynamically measuring deflection values and a dynamic measuring device for road deflection values, wherein the deflection beam comprises a support, at least three beam bodies with lengths extending along the front and back directions are hinged on the support, the beam body part on the front side of the support is a front arm, the beam body part on the back side of the support is a rear arm, the front end of each front arm is provided with a measuring head, the dynamic measuring Beckmann beam for deflection values further comprises a displacement measuring component for detecting the height change of each rear arm, each measuring head is a head end measuring head with a front position, a tail end measuring head with a back position and a middle measuring head between the head end measuring head and the tail end measuring head, the horizontal direction distances between adjacent measuring heads are equal, and the distance between the head end measuring head of the support is larger than the deflection influence radius of wheels on a road to be measured. The invention provides a dynamic measuring device for a deflection value of a deflection beam used by a deflection beam machine for dynamically measuring the deflection value of a road, which can measure the deflection value of the road in the running process of a loading vehicle.
Description
Technical Field
The invention relates to a deflection beam for dynamically measuring deflection values and a dynamic measuring device for the deflection values of roads in the field of measuring the deflection values of the roads.
Background
The deflection value refers to the deformation of the roadbed/road surface before and after the load acts on the roadbed/road surface, 1/100 mm is used as a calculation unit, and the deflection deformation value is very small and is basically within 1 mm.
The rebound deflection is the vertical rebound deformation value generated at the wheel clearance position of the roadbed and the road surface under the action of the specified standard axle load B22-100. The Beckman beam is a common rebound deflection value measuring device, is made of aluminum alloy and comprises a beam body and a support for supporting the beam body, the beam body on the front side of the support is called a front arm, the beam body on the rear side of the support is called a rear arm, the length ratio of the front arm to the rear arm is 2:1, a measuring head is arranged at the end part of the front arm, the length of the front arm is generally 2.4 meters or 3.6 meters, the Beckman beam with the length of 3.6 meters is suitable for testing the rebound deflection of various road surface structures, and the Beckman beam with the length of 2.4 meters is suitable for testing the rebound deflection of flexible asphalt road surfaces.
When a road is tested, a loading vehicle is stopped at a testing position of a testing road section, the loading vehicle is a single-rear-shaft single-side double-wheel-group loading vehicle, a support is placed on the ground, a measuring head of a Beckman beam is inserted into a rear wheel gap of the loading vehicle, a beam arm does not contact with a tire, the measuring head of the Beckman beam is placed on a measuring point 30-50 mm in front of the wheel gap center, the rear wheel of the vehicle presses the road surface to enable the road surface to generate a deflection basin, the length of a front arm enables the support to be located outside the deflection basin, namely, the road surface corresponding to the support does not generate deflection deformation, a dial indicator is mounted on the top surface of a measuring rod at the tail end of the rear arm to command the loading vehicle to advance, the value of the dial indicator continuously increases along with the deformation of the road surface, when the indicator is maximum, the reading L1 is rapidly carried out, the loading vehicle continuously advances, the indicator starts to reversely change, and when the loading vehicle runs to be far away from the deflection influence range, the indicator is stabilized, when the dial indicator reading L2 is read, the rebound deflection value Lt = (L1-L2) × 2. The existing method for detecting the rebound deflection value of the Beckmann beam mainly has the following problems: at the beginning of each road section test, the loading vehicle is required to be stopped on the test road section, after the L1 value is measured, the loading vehicle moves forward for a certain distance and then is stopped on the test road section, that is, the whole measurement process is a static measurement process, which causes that the existing deflection value measurement method can only be used in the road condition without other vehicles in driving, for example, when the deflection value of the road is measured, the road needs to be closed in advance, which greatly affects the traffic and cannot be applied to the opened road condition with other vehicles.
Disclosure of Invention
The invention aims to provide a deflection beam for dynamically measuring deflection values, which can measure the deflection values of roads in the running process of a loading vehicle, and also aims to provide a device for dynamically measuring the deflection values of the roads by using the deflection beam for dynamically measuring the deflection values.
In order to solve the technical problems, the technical scheme of the deflection beam for the dynamic measurement of the deflection value is as follows:
deflection value is deflection roof beam for dynamic measurement, which comprises a support, it has the roof beam body that at least three length extends along the fore-and-aft direction to articulate on the support, the roof beam body part of support front side is the forearm, the roof beam body part of support rear side is the postbrachium, the front end of each forearm all is provided with the gauge head, deflection value dynamic measurement bei ke kelman roof beam still is including the displacement measurement part that is used for detecting each postbrachium altitude variation, each gauge head is the head end gauge head that the position leaned on the front respectively, the tail end gauge head that the position leaned on the back and the middle gauge head that is located between head end gauge head and the tail end gauge head, horizontal direction interval between the adjacent gauge head is the homoenergetic equal, the interval between the head end gauge head is apart from the support is greater than the deflection influence radius of wheel to the road that awaits measuring.
The horizontal direction distance between adjacent measuring heads is L, and the sum of the distance between the tail end measuring head and the head end measuring head and the L is larger than the deflection influence radius of the wheel on the road to be measured.
The beam bodies are sequentially arranged along the up-down direction, from top to bottom, the length of the beam bodies is gradually shortened, and the front end measuring head is arranged on the beam body which is the most upper in position.
The distance between the tail end measuring head and the head end measuring head is smaller than the deflection influence radius of the wheels to the road to be measured.
Each beam body is hinged and connected with the support through the corresponding hinge shaft, the hinge shafts are arranged up and down, and the support is provided with an angle limiting structure which is used for limiting the rotation angle of the beam body by being matched with the corresponding beam body in a limiting way.
The technical scheme of the dynamic measuring device for the road deflection value comprises the following steps:
a dynamic measuring device for road deflection value comprises a loading vehicle and a deflection beam for dynamic measurement of deflection value, wherein the deflection beam for dynamic measurement of deflection value comprises a support, a beam body lifting mechanism is arranged on the loading vehicle and is connected with the deflection beam for dynamic measurement of deflection value through a pull rope, at least three beam bodies with the lengths extending along the front and back directions are hinged on the support, the beam body part at the front side of the support is a front arm, the beam body part at the back side of the support is a back arm, the front end of each front arm is provided with a measuring head, the dynamic measurement Beckman beam for deflection value also comprises a displacement measuring component for detecting the height change of each back arm, each measuring head is a head end measuring head with the front position, a tail end measuring head with the back position and a middle measuring head between the head end measuring head and the tail end measuring head, the head end measuring head is used for extending into a wheel gap of a back wheel of the loading vehicle, and the horizontal direction distance between the adjacent measuring heads is equal, the distance between the support and the head end measuring head is larger than the deflection influence radius of the wheels to the road to be measured.
The horizontal direction distance between adjacent measuring heads is L, and the sum of the distance between the tail end measuring head and the head end measuring head and the L is larger than the deflection influence radius of the wheel on the road to be measured.
The beam bodies are sequentially arranged along the up-down direction, from top to bottom, the length of the beam bodies is gradually shortened, and the front end measuring head is arranged on the beam body which is the most upper in position.
The distance between the tail end measuring head and the head end measuring head is smaller than the deflection influence radius of the wheels to the road to be measured.
Each beam body is hinged and connected with the support through the corresponding hinge shaft, the hinge shafts are arranged up and down, and the support is provided with an angle limiting structure which is used for limiting the rotation angle of the beam body by being matched with the corresponding beam body in a limiting way.
The invention has the beneficial effects that: in the invention, in the process of measuring the deflection value of a road, a loading vehicle is always in the running process, a deflection beam for dynamically measuring the deflection value is firstly put down to the road surface, the deflection beam for dynamically measuring the deflection value needs to carry out measurement twice, and when the wheel gap center of the rear wheel of the loading vehicle corresponds to the head end measuring head in the first time, the deflection values measured from back to front are respectively marked as A1、A2… … An, when the wheel gap center of the rear wheel of the loading vehicle is oppositeWhen the head end measuring head moves forwards for L distance, the second deflection value measurement is carried out, and the deflection amounts measured from the rear to the front measuring points are respectively B1 、B2… … Bn, the deflection value of the road surface = (A)1- B1）+（A2- B2) + … … (An-Bn). After the second measurement is finished, the deflection beam for dynamically measuring the deflection value can be lifted, and the normal running of the loading vehicle is not influenced, so that the dynamic measurement of the deflection value can be finished in the running process of the loading vehicle.
Drawings
FIG. 1 is a schematic diagram of a load vehicle and a deflection beam for dynamic measurement of deflection values when the deflection beam for dynamic measurement of deflection values is not on the ground in an embodiment of the dynamic measurement device for road deflection values of the present invention;
FIG. 2 is a schematic view showing a state of a deflection beam for dynamic deflection value measurement in the first measurement after landing;
FIG. 3 is a schematic view showing a state of a deflection beam for dynamic measurement of a deflection value in the present invention during a second measurement after the beam falls to the ground;
FIG. 4 is a deflection value measurement schematic in the present invention;
FIG. 5 is a schematic structural view of the deflection beam for dynamic deflection value measurement in FIG. 1;
fig. 6 is a schematic view showing the engagement of the holder with the hinge shaft in fig. 5.
Detailed Description
The embodiments of the dynamic measuring device for road deflection values are shown in fig. 1-6: the load vehicle comprises a load vehicle 1 and a deflection beam 9 for deflection value dynamic measurement, wherein a rear wheel 16 of the load vehicle is of a single-side double-wheel structure (one wheel of the double-wheel structure is hidden in figure 1), the load vehicle is in the prior art, the specific structure of the load vehicle is not described in detail, and the load vehicle drives the deflection beam 9 for deflection value dynamic measurement from back to front.
The deflection beam 9 for dynamic measurement of deflection values comprises a support 11, wherein the support 11 is hinged with four beam bodies 10, the length of each beam body extends along the front and back direction, the hinge structures comprise hinge holes, the hinge holes extend along the left and right directions, of the axis of each support, hinge shafts 37, the hinge holes are arranged on the beam bodies and are in running fit with the corresponding hinge holes, the beam bodies are sequentially arranged along the up and down direction, and the length of each beam body is gradually shortened from top to bottom. For each beam body, the beam body part at the front side of the support is a front arm 10-1, the beam body part at the rear side of the support is a rear arm 10-2, the length of the front arm is twice that of the rear arm, the front end of each front arm is provided with a measuring head, the tail end of each rear arm is provided with a displacement measuring part 36 for detecting the height change of the corresponding rear arm, and in the embodiment, the displacement measuring part is a dial indicator. The four beam bodies of the invention are integrated together similarly to four Beckmann beams in the prior art, the horizontal spacing between two adjacent measuring heads is equal, the length of the spacing is defined as L, each measuring head is respectively a head end measuring head 33 with a front position, a tail end measuring head 34 with a rear position and a middle measuring head 35 between the head end measuring head and the tail end measuring head, the spacing between the support 11 and the head end measuring head 33 is larger than the deflection influence radius of the rear wheel to the road to be measured 13, the sum of the spacing between the tail end measuring head 34 and the head end measuring head 33 and the L is larger than the deflection influence radius of the rear wheel to the road to be measured, and the spacing between the tail end measuring head 34 and the head end measuring head 33 is smaller than the deflection influence radius of the rear wheel to the road to be measured. The horizontal distance between the tail measuring head and the support is also L. In the figure, item 25 indicates a deflection basin which is pressed out by the influence of the road by the rear wheels, and the radius in the front-rear direction of the deflection basin is the deflection influence radius.
The deflection influence radius of the rear wheel of the loading vehicle to the road surface means that for the flexible base layer asphalt road surface, the deflection influence radius is within 2.4 meters, for various types of road surface structures, the deflection influence radius does not exceed 3.6 meters, in this embodiment, the distance between the hinge point connected with the uppermost beam body and the head end measuring head of the support 11 is 2.4 meters, that is, when the head end measuring head 33 corresponds to the wheel gap center position of the rear wheel 16 of the loading vehicle, the support is outside the deflection influence range of the rear wheel of the loading vehicle, the tail end measuring head 34 is within the deflection influence range of the rear wheel of the loading vehicle, and when the loading vehicle moves forward by the distance L, the tail end measuring head 34 is outside the deflection influence range of the rear wheel of the loading vehicle, that is, the tail end measuring head is at the rear side of the deflection basin. In other embodiments of the invention, when the device is applied to other pavement deflection value detection, the distance between the hinge point of the support and the beam body and the head end measuring head can also be 3.6 meters.
The loading vehicle is provided with a height lifting mechanism for lifting the height of the deflection beam, the height lifting mechanism comprises a winding drum 4, the winding drum is driven by a winding drum motor, a pulling rope 30 is wound on the winding drum, a pulling rope reversing pulley 6 for reversing the pulling rope by winding is arranged on the loading vehicle 1, and the lower end of the pulling rope 30 is connected with the support 11. The pull rope reversing pulley 6 and the winding drum are both arranged on a cantilever 7, and the front end of the cantilever 7 is fixed on the body of the loading vehicle.
The height-raising mechanism may raise the support to disengage and land the support on the ground, in this embodiment to avoid disengaging the support from the ground, the front end of each beam body is turned downwards to influence the normal running of the loading vehicle, a hinge shaft stop block 38 is fixed on a hinge shaft 37 of each beam body, an upper support stop block 39 and a lower support stop block 40 are fixed on the supports at the upper side and the lower side of the hinge shaft stop block, the upper support stop block 39 and the lower support stop block 40 are used for being in stop fit with the hinge shaft stop block 38, to limit the range of rotation of the beams, in this embodiment, the range of rotation of each beam is within 3 degrees, within the range of the rotation angle, the measurement of the deflection value of the beam body to the corresponding road can be realized enough, because the deflection value of the road is basically within 1mm, the rotation angle required by the beam body is very small, after the support is lifted, the front arm of the beam body is not turned down excessively, so that the measuring head is contacted with the ground.
The downside of cantilever is equipped with a follow-up slider 31 along fore-and-aft direction removal, is fixed with vertical arrangement's guide bar 32 on the support, and the upper end of guide bar and follow-up slider 31 are the cooperation of up-and-down direction removal, and the guide bar is a square pole. Because of the existence of the guide rod, the height lifting mechanism can keep the stability of the support on the upper lifting support and the lower lifting support, the support is prevented from twisting back and forth, and the beams can not twist left and right and touch the rear wheel.
The use principle of the road deflection value dynamic measuring device is shown in figure 4: in the invention, through the deflection value measurement of two moments, when the wheel gap center of the rear wheel 16 of the loading vehicle corresponds to the position of a head end measuring head, which is the first moment, the head end measuring head measures the deflection amount of the basin bottom of the deflection basin, and from back to front, each measuring head respectively measures the deflection amount A1 and A2 … … An of the corresponding position of the deflection basin, in the embodiment, n =4, when the vehicle continuously moves forwards for L displacement, the second moment is equal to the second moment, the whole deflection basin integrally moves forwards for L displacement, and after the time difference, the corresponding position of each measuring point on the deflection basin can generate rebound, at the moment, the deflection amount B1 and the deflection amount B1 corresponding to each measuring point, B2, B3 and B4, B4-A4 represents the rebound quantity generated by the basin bottom of the deflection basin from the first time to the second time, the deflection quantity difference value of other two times represents the deflection rebound quantity generated by other corresponding positions of the deflection basin from the first time to the second time, the (A1-B1) + (A2-B2) + … … (An-Bn) forms the deflection value of the road surface, after the measurement of the second time, the whole deflection beam can be lifted off the road surface through a lifting mechanism, the normal walking of the vehicle cannot be influenced, and the whole displacement of the vehicle is smaller from the first time to the second time, so that the follow-up sliding block follows the cantilever backwards as long as the pull rope slightly keeps in a loose state, the forward movement of the loading vehicle cannot influence the deflection value measuring device, after the deflection value is measured at the second time, the deflection value measuring device can be lifted through the pull rope, the normal advance of the loading vehicle is not influenced. The obtaining of the A value and the B value of each point in the invention is consistent with the obtaining mode of the Beckmann beam in the prior art, and the obtaining mode is as follows: when the beam body is in a horizontal position, a value h1 corresponding to the dial indicator is recorded, h1 is a known value, when a measuring head at the front end of the beam body is in contact with the ground, a value h2 corresponding to the dial indicator is recorded, and deflection values A and B of a road at the position corresponding to the measuring head are = (h 2-h 1) × 2.
At the first moment, how to realize the position correspondence between the wheel gap center of the rear wheel of the loading vehicle and the head end measuring head can be realized through the following two ways, wherein the first way is that when the deflection beam 9 is not in contact with the ground, the head end measuring head is just above the wheel gap center, the deflection beam falls, and when the head end measuring head is in contact with the ground, the reading is directly carried out; the second kind, when the deflection roof beam did not contact with ground, the head end gauge head was in the place ahead 3~5cm that wheel gap central point put, and along with the whereabouts of deflection roof beam, the head end gauge head contacts with ground, and the percentage table value that the head end gauge head corresponds can be earlier by little grow by big diminish again, records the maximum indicating value of the percentage table that the head end gauge head corresponds, and at the moment of the maximum indicating value of the percentage table that the head end gauge head corresponds, other percentage table readings of record simultaneously. After the deflection beam is lowered to the road surface, the pull rope is in a loosening state so as to prevent the loading vehicle from moving forward together with the deflection beam when moving forward.
In other embodiments of the invention: the dial indicator can also be replaced by other displacement measuring components, such as dial indicators, laser displacement sensors and the like; the distance between the tail measuring head and the support also can be different from L, and the number of the middle measuring heads can be set according to requirements, such as one, three or more; the hinged shafts of the beam bodies can be on the same vertical straight line; the hinge axes of the beam bodies can be arranged coaxially; the support can also comprise four independent support units, and each beam body is hinged to the corresponding support unit.
The embodiments of the deflection beam for measuring the deflection value dynamically are shown in FIGS. 1 to 6: the concrete structure of the deflection beam is the same as that of the deflection beam described in the above embodiments of the dynamic road deflection value measuring device, and the detailed description thereof is omitted.
Claims (4)
1. Deflection value is deflection roof beam for dynamic measurement, including the support, its characterized in that: the beam body part at the front side of the support is a front arm, the beam body part at the rear side of the support is a rear arm, the front end of each front arm is provided with a measuring head, the deflection value dynamic measurement Beckmann beam also comprises a displacement measuring component for detecting the height change of each rear arm, each measuring head is a head end measuring head at the front position, a tail end measuring head at the rear position and a middle measuring head positioned between the head end measuring head and the tail end measuring head, the horizontal direction distances between the adjacent measuring heads are equal, the distance between the support and the head end measuring head is larger than the deflection influence radius of a wheel to a road to be measured, the horizontal direction distance between the adjacent measuring heads is L, the sum of the distance between the tail end measuring head and the head end measuring head is larger than the deflection influence radius of the wheel to the road to be measured, and the distance between the tail end measuring head and the head end measuring head is smaller than the deflection influence radius of the wheel to the road to be measured, the beam bodies are sequentially arranged along the up-down direction, from top to bottom, the length of the beam bodies is gradually shortened, and the front end measuring head is arranged on the beam body which is the most upper in position.
2. The deflection beam for dynamic measurement of deflection value according to claim 1, wherein: each beam body is hinged and connected with the support through the corresponding hinge shaft, the hinge shafts are arranged up and down, and the support is provided with an angle limiting structure which is used for limiting the rotation angle of the beam body by being matched with the corresponding beam body in a limiting way.
3. Road deflection value dynamic measurement device, including loading car and deflection beam for deflection value dynamic measurement, the deflection beam for deflection value dynamic measurement includes support, its characterized in that: the loading vehicle is provided with a beam body lifting mechanism, the beam body lifting mechanism is connected with the deflection beam for dynamically measuring the deflection value through a pull rope, at least three beam bodies with the lengths extending along the front and back directions are hinged on the support, the beam body part on the front side of the support is a front arm, the beam body part on the rear side of the support is a rear arm, the front end of each front arm is provided with a measuring head, the dynamically measuring Beckmann beam for measuring the deflection value further comprises a displacement measuring part for detecting the height change of each rear arm, each measuring head is a head end measuring head with the front position close to the front position, a tail end measuring head with the rear position close to the rear position and a middle measuring head between the head end measuring head and the tail end measuring head, the head end measuring head is used for extending into a wheel gap of a rear wheel of the loading vehicle, the horizontal direction distances between the adjacent measuring heads are equal, the distance between the support and the head end measuring head is larger than the deflection influence radius of a road to be measured by a wheel, and the horizontal direction distance between the adjacent measuring heads is L, the distance between the tail end measuring head and the head end measuring head and the sum of L are larger than the deflection influence radius of the wheel to the road to be measured, the distance between the tail end measuring head and the head end measuring head is smaller than the deflection influence radius of the wheel to the road to be measured, each beam body is sequentially arranged along the up-down direction, the length of the beam body is gradually shortened from top to bottom, and the front end measuring head is arranged on the beam body which is the most leaned on in position.
4. The dynamic road deflection value measuring device according to claim 3, wherein: each beam body is hinged and connected with the support through the corresponding hinge shaft, the hinge shafts are arranged up and down, and the support is provided with an angle limiting structure which is used for limiting the rotation angle of the beam body by being matched with the corresponding beam body in a limiting way.
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| CN108333072A (en) * | 2018-01-17 | 2018-07-27 | 交通运输部公路科学研究所 | A kind of road surface dynamic deflection calibration method and device based on respondent behavior reconstruct |
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| CN201873933U (en) * | 2010-11-15 | 2011-06-22 | 北京航天计量测试技术研究所 | Multi-point sensor falling weight deflectometer |
| US9448148B2 (en) * | 2012-04-26 | 2016-09-20 | Quest Integrated, Llc | Rolling weight deflectometer |
| CN104411887A (en) * | 2012-06-14 | 2015-03-11 | 迪纳泰斯特国际有限公司 | Rolling wheel deflectometer |
| CN107012772A (en) * | 2017-03-13 | 2017-08-04 | 长安大学 | A kind of contactless through street deflection testing method |
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