CN111996872A - Method for treating red-layer roadbed filling material by microwave - Google Patents

Abstract

The invention discloses a method for microwave treatment of red layer subgrade filler, belonging to the field of road engineering subgrade filler treatment. Flat filler baffles, microwave equipment boxes, crushing equipment, bearing racks, filler output ports, microwave suppressors, magnetrons, power control systems, etc. The method utilizes the conveyor belt to transport the subgrade filler, makes it dry in the microwave box, rapidly reduces the moisture content of the filler and improves the water stability of the red layer filler, and finally obtains a high-quality subgrade filler with smaller particle size and moisture content that meets the requirements. The principle of the invention is simple and novel, the engineering application value is high, and the performance of the red layer roadbed filler can be improved.

Description

A kind of microwave treatment method of red layer roadbed filler

technical field

The invention relates to the field of road engineering subgrade filler treatment, in particular to the principle and method of using microwaves to treat red layer subgrade filler.

Background technique

Sichuan Province, as the economic center of western my country, in terms of expressway planning, from 2019 to 2035, the total planned route of Sichuan expressway will reach about 16,100 kilometers, an increase of 4,100 kilometers compared with the plan in 2014. The planned inter-provincial entrances and exits will reach 63, adding There are 29 planned routes. In terms of railway planning, seize the opportunity of the construction of the Chengdu-Chongqing economic circle. Projects planned to start construction in 2020 include the Xining-Chengdu Railway, the Chengnan-Dawan High-speed Railway, the Dujiangyan-Siguniang Mountain Mountain Rail Transit, and the Long-Huang-Huang Railway. The capacity expansion and reconstruction of the Syria section and the Chongqing-Kunming high-speed railway have created a huge amount of infrastructure construction in Sichuan.

As the most important part, the subgrade bears the relevant loads of the superstructure and vehicles. The performance of the subgrade directly affects the engineering quality and driving safety. Therefore, it is very necessary to use suitable and well-graded fillers to fill the subgrade. As a common soft rock mass, the red bed rock mass is widely distributed in the Sichuan Basin and its margins. The red bed rock mass in Sichuan is about 165,000 km ² , accounting for about 34% of the total area of Sichuan. With the characteristics of easy weathering and water softening, the red bed rock mass is an unavoidable kind of rock and soil mass in the infrastructure construction in Sichuan. Vertical settlement will occur, and the lateral slip of the basement instability is prone to occur, which will eventually cause engineering hidden dangers and even endanger life safety. Therefore, when building highways and railways in some areas in Sichuan, it is very difficult to obtain high-quality subgrade fillers with good gradation. There are mainly two ways to obtain them. One is to use long-distance transportation, stone factory purchases, etc. Reliability, but the transportation cost is high, the construction period is long, and it is generally rarely used; second, the red layer filler is treated by adding lime, cement, polyaluminum chloride, fiber and other materials on site before using it. However, in the process of processing, these fillers need to be repeatedly turned for drying and crushing in order to reduce the moisture content. In terms of turning and drying, there are many uncertainties, such as being easily affected by weather conditions, and the processing time is long and the efficiency is low. In order to ensure the effect of tumbling, continuous crushing is required; the moisture content of the topsoil decreases after tumbling and drying, but the moisture content of the lower layer is still high. At the same time, many patents for the design and preparation of roadbed fillers have clarified the importance of turning and drying, but the influence of uncertain factors such as weather has not been considered. In the method of preparing roadbed filler from spoil, it is mentioned that the moisture content of spoil is reduced by means of sun exposure and air drying, but a series of uncertain factors such as bad weather and long processing time are not considered.

Under this background, how to reduce the moisture content of the red layer subgrade filler more uniformly and efficiently and improve its structural properties so as to meet the basic requirements of subgrade has become an urgent problem to be solved in subgrade engineering in this area. Along with the process of drying, the invention proposes a new processing method.

In recent years, microwave heating has been widely used in the field of rock and soil material processing. It has the characteristics of rapidity and immediacy. Different from traditional heating methods, microwave heating is to apply a high-frequency electromagnetic field to the material, so that the extreme With the change of the electromagnetic field, the sexual molecules move at high speed in the material. During the high-speed movement, the molecules generate friction with each other, which manifests as a rapid rise in the temperature of the red layer filler on the macroscopic level. The efficiency of microwave heating depends on the dielectric constant of the material itself. The higher the dielectric constant, the easier it is to be heated. Because the dielectric constant of water is 78, the microwave sensitivity is high, and it can quickly heat up and vaporize. The red layer filler passes through the microwave. After treatment, the moisture content can be quickly reduced. At the same time, experimental studies have also shown that the presence of red layer filler-related minerals such as iron oxides can enhance the wave-absorbing properties, and the formation of high temperature inside the red layer filler during microwave irradiation promotes a series of physical and chemical reactions, thus changing the mineralogy In terms of structure and chemical composition, the macroscopic performance is that the water stability of the red layer filler changes, and the engineering properties of the red layer filler are improved after microwave treatment. To sum up, the microwave irradiation treatment of red layer filler can not only avoid the influence of weather, dry the red layer filler quickly, but also improve the engineering performance of the red layer filler, and improve the performance of the roadbed while speeding up the construction progress.

The invention provides a method for treating Sichuan red layer roadbed filler by microwave. The method is simple in combination, easy to operate, and low in cost. Compared with the previous turning and drying, the effect is better after microwave treatment. The physical and chemical properties of the red layer filler are The property is improved due to the absorption of microwaves, the invention is not affected by weather, has good treatment effect, reduces the use of crushing equipment, can significantly improve the progress of the project, and can be used in combination with other physical and chemical improvement methods, and has a wide range of applications.

SUMMARY OF THE INVENTION

The present invention solves two technical problems: firstly, rapidly reducing the moisture content of the red layer filler, avoiding the influence of the related uncertain factors such as weather conditions on the filler when it is turned and aired. 2. Improve the water stability and other properties of the red layer filler. This is due to the fact that the heating of microwave irradiation promotes a series of physical and chemical reactions in the minerals inside the red layer filler, and these reactions change the structure and chemical composition of the red layer filler itself. The experimental results show that the red layer filler after microwave irradiation, its Engineering performance has been improved to varying degrees.

Compared with the traditional roadbed filler, the present invention has the advantages of: utilizing microwave a, eliminating the influence of factors such as weather on turning and drying. b. Improve the water loss speed and speed up the project progress. c. Reduce the use of crushing equipment. d. Changed the relevant engineering properties such as the water stability of the red layer filler itself.

A technical solution of the present invention is to use microwave means to process the red layer filler instead of turning and drying and other related methods; a complete set of microwave combination equipment is pioneered to carry out the actual processing process of the red layer filler.

Described microwave treatment red layer roadbed filling method is:

1) Carry out the investigation and analysis of the filler experiment, combine the microwave equipment, and check the connection of the line. The main equipment includes: non-absorbing conveyor belt, various baffles, conveyor belt rotating motor, microwave suppressor, the entire microwave equipment box, crushing equipment, and carrying rack.

2) After completing the preparations in 1), place the red layer filler to be processed at the filler input port to make it smoothly transfer to the conveyor belt. When the filler is about to reach the microwave equipment box, turn on the microwave equipment switch, and the filler enters the microwave The box is dried. The microwave power can be between 1-30kw. The specific microwave power, processing time, conveying speed of the conveyor belt and the thickness of the input filler should be flexibly determined according to the actual situation.

3) After the microwave box is processed, turn on the crushing equipment, crush the roadbed filler, process the bulk roadbed filler, and obtain the filler with smaller particle size, and determine the maximum particle size range of the filler through the soil borrowing test. After the first crushing, the larger particles are re-screened and transported to the crusher for re-crushing, so that they finally meet the requirements of high-quality fillers.

4) Check whether the red layer roadbed filler processed in steps 2) and 3) meets its requirements. If it does not meet the basic requirements, it needs to be returned to the microwave box for microwave secondary treatment, and finally make it meet the requirements.

5) The treated fillers are collected at the output port, and after meeting the basic requirements, some chemical reagents or physical operation methods are used to complete the final red layer roadbed filler improvement.

According to the requirements of high-quality roadbed filler moisture content, compared with the traditional turning and drying, the solution of using microwave to treat roadbed filler can achieve drying effect quickly and efficiently, save engineering time, have obvious treatment effect, and reduce the use of crushing equipment; at the same time; The overall temperature of the red layer filler after microwave treatment increases, and the high temperature causes a series of physical and chemical reactions inside the red layer filler, thus changing the mineral structure and chemical composition. Change, these two reasons make the microwave treatment of red layer subgrade filler has good engineering economy and practical promotion value.

The working principle of the present invention is as follows:

The basic principles are as follows: 1. In the process of microwave treatment of the filler, the water molecules in the filler are polar molecules, which have strong wave-absorbing ability and can quickly heat up and vaporize. At the same time, the filler itself also heats up as a whole. Other conventional heating methods can heat the inside and outside of the filler at the same time without any heat conduction process. The heating speed is fast and uniform, and the efficiency is high. Second: the presence of related minerals such as iron oxides in the red layer filler can enhance the wave absorbing performance. The formation of high temperature inside the red layer filler during microwave irradiation promotes a series of physical and chemical reactions, thus changing the mineral structure and chemical composition. Macroscopically, the properties such as water stability of the red layer filler changed, and the engineering properties of the red layer filler were improved after microwave treatment.

The advantages of microwave treatment of red layer roadbed filler are efficient and applicable, and have certain engineering value.

The advantages of the present invention are:

a. The present invention adopts microwave treatment of red layer roadbed filler, the method combination is simple, the method is novel, and has certain engineering method practicability.

b. The present invention adopts microwave treatment of the red layer roadbed filler, which can quickly reduce the moisture content of the filler, has high treatment efficiency and low energy consumption.

c, the present invention adopts microwave processing red layer roadbed filler, compared with traditional turning and drying, it is not affected by weather conditions and the processing time is greatly reduced.

d. The present invention adopts microwave treatment of the red layer roadbed filler, which greatly reduces the number of crushing, saves costs, and greatly speeds up the project progress compared with the traditional turning and drying.

e. The present invention adopts microwave treatment of the red layer roadbed filler, which can not only reduce the moisture content of the filler quickly, but also improve the engineering properties such as the water stability of the filler.

f. The present invention adopts microwave treatment of red layer roadbed filler, and the treatment time is short, and it can be used in combination with other physical and chemical improvement methods, and has a wide application range.

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

Description of drawings

Figure 1 is a schematic diagram of the process flow of the method.

Figure 2 is a schematic structural diagram of the method.

FIG. 3 is a front view of the entire microwave treatment subgrade filling process of the embodiment.

Figure 4 is a top view of the whole process of microwave treatment of roadbed filler.

Figure 5 is an enlarged view of the filler input port.

Figure 6 is a simple left side view of a single microwave box.

Labels in the figure: 1-filler input port; 2-conveyor belt side baffle; 3-conveyor belt rotating motor; 4-roadbed filler; 5-non-absorbing conveyor belt; 6-input port smoothing filler baffle; 7-microwave equipment Box; 8- Crushing equipment; 9- Loading frame; 10- Filler output port; 11- Microwave suppressor; 7.1- Magnetron; 7.2- Power control system; 7.3- Cooling water system

Detailed ways

The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments of the present invention, and the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

As shown in the figure, a microwave processing roadbed filling device and method of the present invention includes a filler input port 1; a conveyor belt side baffle 2; a conveyor belt rotating motor 3; a roadbed filler 4; a non-absorbing conveyor belt 5; Board 6; microwave equipment box 7; crushing equipment 8; carrying frame 9; filler output port 10; microwave suppressor 11 and other main equipment.

As shown in Figure 5, the filler input port 1 of the present invention is the beginning of the material entering the conveyor belt; the conveyor belt material is required to be non-absorbing material, and the conveyor belt side baffles 2 are located on both sides of the non-absorbing conveyor belt 5 to prevent roadbed fillers It slides off the conveyor belt and is microwave transparent material, such as mica board, etc. The smoothing filler baffle 6 is to smooth the roadbed filler, make it transmit smoothly, and prevent large stones or fillers from entering the microwave box, so as to ensure the input material. Uniformity, controls the amount of thickness of the input filler.

As shown in Figures 3 and 4, the non-absorbing conveyor belt 5 is used to transport roadbed fillers; the non-absorbing conveyor belt 5 is driven by the conveyor belt rotating motor 3, and the speed of the conveyor belt is determined according to the processing capacity of the actual microwave box 7 and the characteristics of the filler itself The whole process also includes a microwave suppressor 11 to prevent microwave leakage before and after the conveyor belt enters and exits; the microwave equipment box 7 processes the roadbed filler, and finally the crushing equipment 8 is used to crush the roadbed filler to obtain smaller particle size. Filler to meet particle size requirements.

As shown in Figure 6, the microwave equipment box 7 is the main equipment of the method, which mainly includes the magnetron 7.1 to emit microwaves to process the subgrade filler; the power control system 7.2 adjusts the output power, and the cooling water system 7.3 is used to cool the magnetron. tube to absorb excess microwaves. In the process of microwave box processing, the uniformity of material processing must be ensured. The specific microwave power and microwave processing time should be determined according to the actual situation. On this basis, various microwave equipment can be used flexibly without limitation. meet the processing requirements.

The bearing frame 9 is used as the bearing structure of the entire equipment to ensure the stability of the process and the normal operation of the entire equipment; the filler output port 10 finally outputs high-quality roadbed filler that meets the moisture content requirements, combined with some chemical reagents or Physical operation method to complete the final roadbed filler improvement.

A method for microwave treatment of red layer roadbed filler in Sichuan area of the present invention may specifically include the following steps:

The first step is to turn on the conveyor belt to rotate the motor device 3 to make it run, check the connection of each part, conduct experimental exploration and analysis, and adjust the power required by each device to maximize efficiency, and check the circuit connection of each device. , make all preparations.

The second step is to place the red layer filler to be processed at the filler input port 1. After smoothing the filler baffle 6, it is smoothly transferred to the conveyor belt. When the filler is about to reach the microwave equipment box 7, turn on the microwave equipment switch, and the filler enters the microwave box with the conveyor belt for drying treatment. The microwave power range can be between 1-30kw. In order to achieve the best moisture content effect, experimental research can be carried out in advance to adjust the microwave power control system, conveyor belt transportation speed and smoothing. Enter the thickness of the filler, and the specific microwave cabinet equipment combination should be flexibly determined according to the actual situation.

The third step, after the microwave equipment treatment, open the crushing equipment 8, crush the roadbed filler after the microwave treatment, process the bulk roadbed filler, obtain the filler with smaller particle size, and determine the maximum particle size of the filler through the soil borrowing test The range is generally not more than 15cm. According to the actual situation, after the first crushing, the larger particles can be re-screened and transported to the crusher for re-crushing, so that they finally meet the requirements of high-quality fillers.

The fourth step is to repeatedly place the red layer filler to the input port 1, and check whether the subgrade filler after microwave treatment meets the requirements. After a period of time, the treated fillers are collected at the output port 10, and the final red layer roadbed filler improvement is completed by using some chemical reagents or physical operation methods.

The invention provides a method for rapidly processing red layer roadbed filler by microwave, which is novel, has high processing speed, simple combination of methods, good processing effect, and can obviously improve the progress of the project.

The invention utilizes the method of microwave treatment of the red layer roadbed filler. After microwave treatment, the water content can be rapidly reduced, the engineering performance of the red layer filler can be changed, and finally the requirement of high-quality roadbed filler is achieved. The disclosed technical means are not limited to the technical means disclosed in the above embodiments, but also include technical solutions formed based on any combination of the technical features.

Claims (7)

1. a method for microwave treatment of red bed roadbed filler, is characterized in that: predetermine relevant properties such as the amount of red bed raw materials that need to be handled and moisture content; Secondly, combine microwave equipment to carry out the processing of red bed filler; Then, utilize crushing equipment The bulk subgrade filler is processed; finally, the final high-quality subgrade filler is obtained by combining with other physical and chemical methods. 2. A method for microwave treatment of red layer roadbed filler, the embodiment of which is characterized in that it comprises a filler input port 1, a conveyor belt side baffle 2; a conveyor belt rotating motor 3; a roadbed filler 4; a non-wave absorbing conveyor belt 5; Flat filler baffle 6; microwave equipment box 7; crushing equipment 8; carrying frame 9; filler output port 10; microwave suppressor 11 and other related equipment. 3. the method for microwave treatment of red layer roadbed filler according to claim 1, its embodiment is characterized in that: firstly carry out experimental investigation to determine the relevant properties such as the number of red layer raw materials that need to be processed and moisture content, flexibly combine microwave equipment and adjust each. The power required by the equipment, check the circuit connection of each equipment, and make all preparations. 4. the method for microwave processing red layer roadbed filler according to claim 1, its embodiment is characterized in that: the red layer filler that needs to be processed is placed on the filler input port, smoothly transmitted on the conveyor belt, the microwave equipment switch is turned on, the filler Enter the microwave box with the conveyor belt for drying treatment. In order to meet the treatment requirements, the microwave power can be between 1-30kw. The specific microwave power and microwave treatment time should be determined according to the actual situation. At the same time, the microwave equipment can be adjusted during the treatment process. The combination and parameters, various methods and processing procedures are determined according to the actual situation. 5. the method for microwave processing red layer subgrade filler according to claim 1, its embodiment is characterized in that: the subgrade filler after microwave treatment is broken, the subgrade filler of processing bulk, obtains the filler with smaller particle size, The maximum particle size range of the filler is determined by the soil borrowing test, which is generally not more than 15cm. According to the actual situation, after the first crushing, the larger particles can be re-screened and transported to the crusher for re-crushing, so that they can finally meet the high-quality requirements. Filler requirements. 6. the method for microwave processing red layer roadbed filler according to claim 1, its embodiment is characterized in that: need to repeatedly check whether the processed roadbed filler meets the requirements such as predetermined moisture content, if not satisfied, need to change the microwave equipment. Power and processing time, or change the combination of microwave equipment, perform secondary microwave processing to make it meet the predetermined requirements. 7. the method for microwave treatment of red layer roadbed filler according to claim 1, its embodiment is characterized in that: after a period of time, after a period of time, the treated filler is combined with some chemical reagents or physical operation methods to complete the final red layer Subgrade filler improvement.

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