阅读说明：本技术 原位沥青路面就地热再生加热过程实验装置及实施方法 (In-situ asphalt pavement in-situ heat regeneration heating process experimental device and implementation method ) 是由 张陈 顾海荣 燕铎 肖茹 仙凯 于 2019-09-16 设计创作，主要内容包括：本发明公开了一种原位沥青路面就地热再生加热过程实验装置,包括加热器、路面温度传感器、底层温度传感器和埋设在加热器内部用于加热的加热电阻丝；加热器上设置有多个纵向贯通的传感器安装孔,至少可容纳一个路面温度传感器和一个底层温度传感器；路面温度传感器可穿过传感器安装孔与加热器下表面处的沥青路面表面相接触,测量沥青路面表面的温度；所述底层温度传感器可穿过传感器安装孔插入沥青路面上的预设孔内,测量沥青路面设定深度处的温度值。本实验装置为就地热再生机组施工过程中加热温度参数控制提供了依据,解决了就地热再生技术存在的工作效率低及能耗高等问题。(The invention discloses an in-situ asphalt pavement in-situ heat regeneration heating process experimental device, which comprises a heater, a pavement temperature sensor, a bottom layer temperature sensor and a heating resistance wire which is embedded in the heater and used for heating; the heater is provided with a plurality of sensor mounting holes which are longitudinally communicated and can at least accommodate a road surface temperature sensor and a bottom layer temperature sensor; the pavement temperature sensor can pass through the sensor mounting hole to contact with the surface of the asphalt pavement on the lower surface of the heater, and measures the temperature of the surface of the asphalt pavement; the bottom temperature sensor can be inserted into a preset hole in the asphalt pavement through the sensor mounting hole to measure the temperature value at the set depth of the asphalt pavement. The experimental device provides a basis for controlling the heating temperature parameter in the construction process of the in-situ heat regeneration unit, and solves the problems of low working efficiency, high energy consumption and the like in the in-situ heat regeneration technology.)

1. An in-situ asphalt pavement in-situ heat regeneration heating process experimental device is characterized by comprising a heater, a pavement temperature sensor, a bottom layer temperature sensor and a heating resistance wire which is buried in the heater and used for heating;

the heater is provided with a plurality of sensor mounting holes which are longitudinally communicated and can at least accommodate a road surface temperature sensor and a bottom layer temperature sensor;

the pavement temperature sensor can pass through the sensor mounting hole to contact with the surface of the asphalt pavement on the lower surface of the heater, and measures the temperature of the surface of the asphalt pavement;

the bottom temperature sensor can be inserted into a preset hole in the asphalt pavement through the sensor mounting hole to measure the temperature value at the set depth of the asphalt pavement.

2. The in-situ asphalt pavement hot recycling heating process experimental device as claimed in claim 1, further comprising a spring mechanism, wherein the pavement temperature sensor is disposed in the sensor mounting hole and pressed against the asphalt pavement surface at the lower surface of the heater through the spring mechanism.

3. The in-situ asphalt pavement hot recycling heating process experimental device as claimed in claim 1, wherein the other surfaces of the heater except the lower surface are covered with heat insulation devices.

4. The in-situ asphalt pavement hot in-place recycling heating process experimental device as claimed in claim 1, wherein the heating resistance wires are uniformly bent and distributed and embedded in the heater.

5. The in-situ asphalt pavement hot in-place recycling heating process experimental facility as claimed in claim 1, wherein a plurality of sensor mounting holes for accommodating pavement temperature sensors are uniformly distributed in the surrounding area on the heater.

6. The in-situ asphalt pavement hot recycling heating process experimental facility as claimed in claim 1, wherein sensor mounting holes for receiving the underlying temperature sensors are distributed in a central area of the heater.

7. The in-situ asphalt pavement hot recycling heating process experimental facility as claimed in claim 6, wherein two bottom temperature sensors are provided and symmetrically distributed in the central region of the heater.

8. The in-situ asphalt pavement hot in-place recycling heating process experimental device as claimed in claim 1, wherein a heat-conducting silicone layer is coated between the surface heating area where the lower surface of the heater is in contact with the asphalt pavement.

9. The in-situ asphalt pavement hot recycling heating process experimental device as claimed in claim 1, wherein the heating resistance wire takes a vehicle-mounted power supply as power, and the output power of the heating resistance wire is adjusted by adjusting the output voltage of the vehicle-mounted power supply.

10. The implementation method of the in-situ asphalt pavement hot in-place recycling heating process experimental device based on claim 1 is characterized by comprising the following steps of:

s1, drilling the asphalt pavement at the site;

s2, smearing a heat-conducting silicone layer between the contact areas of the lower surface of the heater and the surface of the asphalt pavement;

s3, overlapping the sensor mounting hole in the central area of the heater with a hole pre-drilled on the asphalt pavement to form a through hole, and enabling the bottom layer temperature sensor to penetrate through the through hole and extend into the position of the asphalt pavement with the preset depth;

placing a pavement temperature sensor in a sensor mounting hole of a surrounding area on a heater, and pressing the pavement temperature sensor to be attached to the upper surface of the asphalt pavement through a spring mechanism;

s4, adjusting the output voltage of the programmable power supply, heating a heating resistance wire in the heater, keeping the upper surface temperature of the asphalt pavement measured by the pavement temperature sensor stable at a set value, and recording all data when the test value of the bottom layer temperature sensor reaches a preset value;

s5, recording the time required by heating, and determining the construction speed according to the time and the length of the heater;

s6, obtaining the power required by the asphalt pavement according to the integral of the heating power in the time required by the heating, determining the heat transfer efficiency between the heater and the asphalt pavement, and estimating the heating energy consumption of the pavement.

Technical Field

The invention relates to a method and a device for carrying out experiments, in particular to an experimental device for an in-situ asphalt pavement hot in-place recycling heating process.

Background

The asphalt pavement on-site thermal regeneration technology aims at solving the problem of insufficient petroleum resources, waste asphalt mixture is directly recycled, the waste asphalt mixture is heated by a heater, a hot milling machine mills the waste asphalt mixture to a certain depth, a corresponding asphalt regenerant and a small amount of new asphalt mixture are added, and a new pavement is formed by mixing, paving and compacting.

One of the key technologies of the hot in-place recycling technology lies in the heating technology of the asphalt pavement, but temperature control in the heating process of the asphalt pavement is also the main technical difficulty of the asphalt pavement heating technology in hot in-place recycling, especially the problem of high energy consumption, and the popularization and application of the hot in-place recycling technology are seriously influenced.

Disclosure of Invention

The invention aims to provide an experimental device for simulating the hot in-place recycling heating process of an asphalt pavement on an actual working site, aiming at determining the heating parameters of a hot in-place recycling unit and improving and solving the problems of low working efficiency, high energy consumption and the like in the hot in-place recycling technology.

In order to achieve the purpose, the invention adopts the following technical scheme:

an in-situ asphalt pavement in-situ heat regeneration heating process experimental device comprises a heater, a pavement temperature sensor, a bottom layer temperature sensor and a heating resistance wire which is buried in the heater and used for heating;

the heater is provided with a plurality of sensor mounting holes which are longitudinally communicated and can at least accommodate a road surface temperature sensor and a bottom layer temperature sensor;

the pavement temperature sensor can pass through the sensor mounting hole to contact with the surface of the asphalt pavement on the lower surface of the heater, and measures the temperature of the surface of the asphalt pavement;

the bottom temperature sensor can be inserted into a preset hole in the asphalt pavement through the sensor mounting hole to measure the temperature value at the set depth of the asphalt pavement.

And the pavement temperature sensor is arranged in the sensor mounting hole and is pressed on the surface of the asphalt pavement at the lower surface of the heater through the spring mechanism.

Further, the other surfaces of the heater except the lower surface are covered with heat insulating means.

Furthermore, the heating resistance wires are uniformly bent and distributed and embedded in the heater.

Further, a plurality of sensor mounting holes for accommodating the road surface temperature sensors are evenly distributed in the surrounding area on the heater.

Further, sensor mounting holes for receiving the underlying temperature sensors are distributed in a central region on the heater.

Further, two bottom layer temperature sensors are provided, symmetrically distributed in the central region of the heater.

Further, a heat-conducting silicone grease layer is coated between the surface heating area where the lower surface of the heater is in contact with the asphalt pavement.

Furthermore, the heating resistance wire takes a vehicle-mounted power supply as power, and the output power of the heating resistance wire is adjusted by adjusting the output voltage of the vehicle-mounted power supply.

An implementation method of an in-situ asphalt pavement in-situ heat regeneration heating process experimental device comprises the following steps:

s1, drilling the asphalt pavement at the site;

s2, smearing a heat-conducting silicone layer between the contact areas of the lower surface of the heater and the surface of the asphalt pavement;

s3, overlapping the sensor mounting hole in the central area of the heater with a hole pre-drilled on the asphalt pavement to form a through hole, and enabling the bottom layer temperature sensor to penetrate through the through hole and extend into the position of the asphalt pavement with the preset depth;

placing a pavement temperature sensor in a sensor mounting hole of a surrounding area on a heater, and pressing the pavement temperature sensor to be attached to the upper surface of the asphalt pavement through a spring mechanism;

s4, adjusting the output voltage of the programmable power supply, heating a heating resistance wire in the heater, keeping the upper surface temperature of the asphalt pavement measured by the pavement temperature sensor stable at a set value, and recording all data when the test value of the bottom layer temperature sensor reaches a preset value;

s5, recording the time required by heating, and determining the construction speed according to the time and the length of the heater;

s6, obtaining the power required by the asphalt pavement according to the integral of the heating power in the time required by the heating, determining the heat transfer efficiency between the heater and the asphalt pavement, and estimating the heating energy consumption of the pavement.

The invention achieves the following beneficial effects:

the experimental device takes a vehicle-mounted power supply as power, adopts a cast resistance heating device, changes heating power by adjusting the working voltage of a heating resistance wire, and maintains the temperature of the asphalt pavement surface in the heating process at a set value required by the process until the temperature at the regeneration depth reaches the requirement. And recording a heating power curve in the heating process and temperature curves at different depths of the asphalt pavement, and providing a basis for controlling heating parameters of the in-situ heat regeneration unit.

Drawings

FIG. 1 is a schematic diagram of an in-situ thermal regeneration heating process experimental facility for an in-situ asphalt pavement;

FIG. 2 is an experimental diagram of an in-situ thermal regeneration heating process experimental facility for an in-situ asphalt pavement;

FIG. 3 is a flow chart of an in situ asphalt pavement hot in-place recycling heating process;

in the figure, 1, a heater, 2, a road surface temperature sensor, 3, a bottom layer temperature sensor, 4, a spring mechanism, 5, a road surface, 6, a heating resistance wire, 71.72, a sensor mounting hole and 8 holes are arranged.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part of this application.

As shown in fig. 1 and 2, the in-situ asphalt pavement hot in-place recycling heating process experimental device of the invention comprises a heater 1, a pavement temperature sensor 2, a bottom layer temperature sensor 3, a spring mechanism 4 and a heating resistance wire 6.

A heating resistance wire 6 which is uniformly distributed in a bending way is embedded in the heater 1, the heating temperature of the lower surface of the heater 1 can be kept uniform, and except the lower surface, other surfaces of the heater 1 are covered with heat insulation devices for ensuring that the heating energy of the heater 1 is completely output from the lower surface.

The heater 1 is provided with a plurality of sensor mounting holes 71, 72, wherein the plurality of sensor mounting holes 71 distributed around the heater 1 are used for accommodating the road surface temperature sensors 2, and two sensor mounting holes 72 arranged near the central point or 1 sensor mounting hole 72 arranged only at the central point are used for accommodating the underlayer temperature sensor 3. The road surface temperature sensor 2 passes through the sensor mounting hole 71 and is pressed against the surface of the asphalt road surface 5 at the lower surface of the heater 1 by the spring mechanism 4 toward the asphalt road surface 5 for measuring the temperature of the asphalt road surface. The bottom layer temperature sensor 3 can be inserted into a pre-drilled hole 8 with a set depth of the asphalt pavement 5 through the sensor mounting hole 72 to measure the temperature value at the set depth of the asphalt pavement. In this embodiment, the set depth of the hole 8 is 40 mm.

The controller comprises a temperature acquisition part and a heating power control part, wherein the temperature acquisition part adopts a pavement temperature sensor 2 and a bottom layer temperature sensor 3 to respectively detect the temperatures of the surface and the inner parts of the asphalt pavement at different depths; the heating power control part automatically adjusts the voltage at two ends of the resistance wire 6 of the heater according to the collected surface temperature of the asphalt pavement, changes the heating output power and maintains the surface temperature of the asphalt pavement as a set value.

The experimental device takes a vehicle-mounted power supply as power, adopts a cast resistance heating device, changes heating power by adjusting the working voltage of the heating resistance wire 6, and maintains the temperature of the asphalt pavement surface in the heating process at a set value required by the process until the temperature at the regeneration depth reaches the requirement. And recording a heating power curve in the heating process and temperature curves at different depths of the asphalt pavement, and providing a basis for controlling heating parameters of the in-situ heat regeneration unit.

The heater 1 has a rectangular parallelepiped structure with dimensions 300x300x30mm, and is typically made of cast copper.

A vehicle-mounted generator: and a system power supply is provided, and the output power is more than or equal to 5 KW.

A program-controlled power supply: the output power is more than or equal to 5KW, the power output of the heater 1 is adjusted by changing the output voltage under the control of the controller, and then the surface temperature of the asphalt pavement is ensured to be a set value.

Referring to fig. 3, an experimental method for in-situ hot recycling heating process of asphalt pavement comprises the following steps:

s1, heating the site of the road surface and drilling 8;

s2, coating heat-conducting silicone grease;

s3, installing a heater 1;

s4, controlling the heating process;

s5, recording data;

and S6, estimating heating energy consumption.

In step S1, site selection is performed on site, and a hole 8 (with a depth of 40mm and a hole diameter of 2mm, the depth of the site drilling hole can be adjusted according to the construction requirements in order to reduce the influence on the overall heat transfer) is drilled;

in the step S2, according to the site selection of the heating site and the shape of the heating surface of the heater 1, a surface heating area of the asphalt pavement is defined, a thin layer of heat-conducting silicone grease is coated between the surface heating area of the asphalt pavement and the lower surface of the heater 1, and the heat resistance of heat transfer between the heater 1 and the asphalt pavement is reduced;

in step S3, heater 1 is mounted: the sensor mounting hole 72 on the heater 1 is coincided and communicated with the pre-drilled hole 8 on the asphalt pavement 5, the bottom temperature sensor 3 passes through the sensor mounting hole 72 and extends into the position (the depth position of 40mm in the embodiment) of the depth measurement in the hole through the drilled hole 8, the pavement temperature sensor 2 is placed in the sensor mounting hole 71 and is pressed towards the asphalt pavement to be tightly adhered to the surface of the asphalt pavement through the spring mechanism 4, and the heater 1 is covered at the position of smearing the heat-conducting silicone grease;

in step S4, heating process control: the heating temperature of the road surface is set through the controller, the output voltage of the programmable power supply is adjusted, the heating resistance wire 6 is heated, the road surface temperature measured by the road surface temperature sensor 2 is kept stable at a set value, the test value of the bottom layer temperature sensor 3 heated to the depth of 40mm reaches a preset value, and all data are recorded;

in step S5, the time required for completion of heating is recorded: according to the time, the construction speed can be determined by combining the length of the heater;

construction speed = heater length/time;

the faster the construction speed, the higher the heating power, otherwise, the smaller the heating power, and can be used for guiding the construction speed.

In step S6, heating energy: the power required by the road surface can be obtained according to the integral of the heating power within the time required by finishing heating, the heat transfer efficiency between the heater 1 and the road surface is determined by combining a plurality of construction tests, and the heating energy consumption of the road surface is estimated.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.