SU742520A1

SU742520A1 - Apparatus for dynamic testing of road paving

Info

Publication number: SU742520A1
Application number: SU782585179A
Authority: SU
Inventors: Евгений Кириллович Пахомов; Лев Абрамович Бляхер; Юрий Константинович Целыковский; Сергей Степанович Коновалов; Виктор Николаевич Гайтер; Гавриил Григорьевич Зеличенок; Юрий Михайлович Яковлев; Феликс Яковлевич Леин; Аскер Измайлович Азизов
Priority date: 1978-02-28
Filing date: 1978-02-28
Publication date: 1980-06-25

Description

Изобретение относится к строительству дорог, в частности, к устройствам для испытания структуры покрытий дорог и· аэродромов и может быть использовано для испытания строительных фундаментов и естественных структур, например, геофизических 5 образований.The invention relates to the construction of roads, in particular, to devices for testing the structure of road surfaces and aerodromes and can be used to test building foundations and natural structures, for example, geophysical 5 formations.

Известно устройство для динамического нагружения дорожных одежд, включающее полую штангу с падающими грузами, один из которых расположен внутри нее, а другойснаружи, а штамп, состоящий из двух под- ^,0пружиненных частей [1].A device for the dynamic loading of pavements, including a hollow bar with falling loads, one of which is located inside it, and the other outside, and a stamp consisting of two sub- ^{, 0} spring parts [1].

Падающие поочередно грузы имитируют переднее и заднее колеса движущегося автомобиля. Устройство не обеспечивает необходимую точность измерения, так как на дорожную одежду воздействуют не сами колеса автомобиля, а имитирующие их элементы.Alternately falling loads simulate the front and rear wheels of a moving car. The device does not provide the necessary measurement accuracy, since the pavement is not affected by the wheels of the car itself, but by elements imitating them.

Наиболее близким техническим решением к данному изобретению является устройст- 20 во для динамических испытаний дорожных одежд, включающее раму на пневматических колесах с источником динамической нагруз2 ки и измерительный элемент, соединенный с регистрирующей аппаратурой [2].The closest technical solution to this invention is a device for dynamic testing of pavements, including a frame on pneumatic wheels with a source of dynamic load and a measuring element connected to recording equipment [2].

Однако не обеспечивается необходимая точность измерения, так как измерение происходит только при неподвижном положении источника динамической нагрузки.However, the necessary measurement accuracy is not ensured, since the measurement takes place only when the dynamic load source is stationary.

Цель изобретения — обеспечение возможности измерений в процессе движения.The purpose of the invention is the provision of the possibility of measurements in the process of movement.

Это достигается тем, что в устройстве для динамических испытаний дорожных одежд, включающем раму на пневматических колесах с источником динамической нагрузки и измерительный элемент, соединенный с регистрирующей аппаратурой, в качестве измерительного элемента используют камеры пневматических колес, отверстия которых соединены трубопроводом с регистрирующей аппаратурой.This is achieved by the fact that in the device for dynamic testing of pavements, including a frame on pneumatic wheels with a source of dynamic load and a measuring element connected to the recording equipment, chambers of pneumatic wheels are used as a measuring element, the openings of which are connected by a pipeline to the recording equipment.

На фиг. 1 представлен общий вид устройства; на фиг. 2 показана векторная диаграмма, иллюстрирующая физическую зависимость между измеряемой реакцией испытываемой дорожной одежды и динамической нагрузкой; на фиг. 3 дан разрез А-А на фиг. 1.In FIG. 1 shows a General view of the device; in FIG. 2 is a vector diagram illustrating a physical relationship between a measured response of a test pavement and a dynamic load; in FIG. 3 shows a section AA in FIG. 1.

Устройство для динамических испытаний дорожных одежд содержит раму 1, опирающуюся спереди на захват 2 базовой машины 3, а сзади — на ось 4 измерительного элемента в виде колес 5. В базовой машине 3 установлен источник энергии, регистрирующая и задающая аппаратура и рабочее место оператора. Источник 6 динамической нагрузки Р, например вибратор, жестко установлен на раме 1. Изменение реакции испытываемого дорожного покрытия на воздействие ‘динамической нагрузки Р фиксируют путем замера перепадов давления в камерах 7 и 8 колес 5, выходные отверстия 9 и 10 которых соединены трубопроводом с регистрирующей аппаратурой (на фигурах не показана) базовой машины 3.A device for dynamic testing of pavement contains a frame 1, which rests on the front on the grip 2 of the base machine 3, and on the back - on the axis 4 of the measuring element in the form of wheels 5. An energy source is installed in the base machine 3, which records and sets the equipment and the operator’s workplace. The source 6 of the dynamic load P, for example a vibrator, is rigidly mounted on the frame 1. The change in the reaction of the test pavement to the effect of 'dynamic load P is fixed by measuring the pressure drops in the chambers 7 and 8 of the wheels 5, the outlet openings 9 and 10 of which are connected by a pipeline to the recording equipment (not shown in the figures) of the base machine 3.

Устройство работает следующим образом.The device operates as follows.

При перемещении базовой машины 3 по испытываемой дорожной одежде включают источник энергии, приводящий в движение источник 6 динамической нагрузки Р, которую передают на испытываемую дорожную одежду через колеса 5, вызывая ее реакцию (фиг. 2).When moving the base machine 3 through the test pavement, an energy source is turned on, which drives the dynamic load source 6, which is transmitted to the test pavement through the wheels 5, causing its reaction (Fig. 2).

В процессе действия источника 6 происходит сжатие газового наполнителя, например воздуха, в камерах 7 и 8 колес 5, давление на их стенки возрастает. Величина этого давления зависит от реакции испытываемого покрытия, которая, в свою очередь, зависит от свойств этого покрытия. Через выходные отверстия 9 и 10, соединенные с регистрирующей аппаратурой, давление передают на измерительные приборы, расположенные в базовой машине 2.During the action of the source 6, a gas filler, for example air, is compressed in the chambers 7 and 8 of the wheels 5, and the pressure on their walls increases. The magnitude of this pressure depends on the reaction of the test coating, which, in turn, depends on the properties of this coating. Through the outlet openings 9 and 10 connected to the recording equipment, the pressure is transmitted to the measuring devices located in the base machine 2.

Применение данного устройства позволит обеспечить возможность измерений реакций дорожных одежд в процессе движения, что значительно повысит точность измерений. Это достигается за счет того, что ре5 акция испытываемой дорожной одежды вызывается постоянно действующей на нее перемещающейся динамической нагрузкой, т.е. структура испытывается не в отдельных точках, а на протяжении всего участка, по которому движется устройство, это позволит ίο учитывать воздействие указанной перемещающейся динамической нагрузки на физико-механические свойства испытываемого покрытия.The use of this device will make it possible to measure the reactions of pavements in the process of movement, which will significantly increase the accuracy of measurements. This is achieved due to the fact that the reaction of the tested pavement is caused by a constantly moving dynamic load, i.e. the structure is tested not at individual points, but throughout the entire section along which the device moves, this will allow taking into account the effect of the indicated moving dynamic load on the physicomechanical properties of the test coating.

Claims

The invention relates to the construction of roads, in particular, to devices for testing the structure of road pavements and airfields and can be used to test building foundations and natural structures, for example, geophysical formations. A device for dynamically loading road pavements is known, comprising a hollow shaft with falling weights, one of which is located inside it and the other outside, and a chip consisting of two spring-loaded parts 1. The weights that fall alternately imitate the front and rear wheels of a moving car. The device does not provide the necessary accuracy of measurement, since the road clothes themselves are not affected by the wheels of the car, but by the elements imitating them. The closest technical solution to this invention is a device for dynamic testing of pavements, including a frame on pneumatic wheels with a source of dynamic load and a measuring element connected to recording equipment 2. However, measurement accuracy is not necessary, since measurement only takes place when stationary source of dynamic load. The purpose of the invention is to provide the possibility of measurement in the process of movement. This is achieved by the fact that in a device for dynamic testing of pavements, including a frame on pneumatic wheels with a dynamic load source and a measuring element connected to recording equipment, the chambers of pneumatic wheels are used as measuring element by piping with recording equipment. FIG. 1 shows a general view of the device; in fig. Figure 2 shows a vector diagram illustrating the physical relationship between the measured response of the tested pavement and the dynamic load; in fig. 3 shows section A-A in FIG. 1. A device for dynamic testing of pavements contains a frame 1, resting on the grip 2 of the base machine 3, and on the axis 4 of the measuring element in the form of wheels 5. The base machine 3 has an energy source, recording and setting equipment and an operator’s workplace . The source 6 of the dynamic load P, for example a vibrator, is rigidly mounted on the frame 1. The change in the response of the test road to the impact of the dynamic load P is recorded by measuring the pressure drops in the chambers 7 and 8 of the wheels 5, the outlet openings 9 and 10 of which are connected by pipeline with recording equipment ( not shown in the figures) of the base machine 3. The device operates as follows. When the base machine 3 is moved along the test road pavement, an energy source is included that drives the dynamic load source 6 P, which is transmitted to the test road pavement through the wheels 5, causing it to react (Fig. 2). During the action of the source 6, the gas filler, for example air, is compressed in the chambers 7 and 8 of the wheels 5, the pressure on their walls increases. The magnitude of this pressure depends on the reaction of the coating being tested, which, in turn, depends on the properties of the coating. Through the outlet openings 9 and 10, connected to the recording equipment, the pressure is transmitted to the measuring instruments located in the base machine 2. The use of this device will ensure the possibility of measuring the reactions of the pavements in the process of movement, which will significantly increase the accuracy of measurements. This is achieved due to the fact that the reaction of the pavement being tested is caused by a constantly moving dynamic load, i.e. the structure is tested not at individual points, but over the entire area along which the device moves, this will allow to take into account the effect of the specified moving dynamic load on the physicomechanical properties of the test coating. Apparatus of the Invention A device for dynamic testing of pavements, comprising a frame on pneumatic wheels with a dynamic load source and a measuring element connected to recording equipment, characterized in that, in order to ensure the possibility of measuring during movement, the chambers of pneumatic wheels are used as a measuring element, the openings of which are connected by pipeline with recording equipment. Sources of information taken into account during the examination 1. USSR author's certificate No. 487976, cl. E 01 23/07, 1974.

2. USSR Author's Certificate for Application No. 2315218 / 29-33, cl. E 01 C 23/07. 1976.