WO2023159712A1

WO2023159712A1 - In-situ road construction method using in-situ soil

Info

Publication number: WO2023159712A1
Application number: PCT/CN2022/083094
Authority: WO
Inventors: 汪建斌; 刘松玉; 肖金军; 韩健
Original assignee: 广东盛瑞科技股份有限公司
Priority date: 2022-02-24
Filing date: 2022-03-25
Publication date: 2023-08-31
Also published as: CN114941265A; CN114941265B

Abstract

An in-situ road construction method using in-situ soil, comprising steps: digging in sections foundation soil within a road boundary line range (1), and mixing said foundation soil with a cementing material and water to form cementing slurry (31); extracting the cementing slurry (31) into a foaming and mixing apparatus (6) to be mixed with foam generated by the foaming and mixing apparatus (6) so as to form foamed polymeric soil slurry; casting in situ and backfilling a roadbed part of each road section with the foamed polymeric soil slurry, and completing roadbed filling by means of natural maintenance. On the one hand, since 1m³ of foundation soil can be processed into 2-10m³ of foamed polymeric soil, there is no need to use offsite soil, thereby solving the problem of difficulty in getting soil, and meanwhile effectively protecting the environment; on the other hand, a roadbed with certain strength is formed by means of natural maintenance, so flattening and rolling are not needed, thereby reducing the use of road construction machinery, and achieving low carbon and environmental friendliness.

Description

A method of building roads in situ by borrowing soil in situ

technical field

The invention relates to the field of road engineering, in particular to a method for building roads in situ by borrowing soil in situ.

Background technique

As the state strengthens the protection of land resources and mountain forest resources, it is becoming more and more difficult to obtain soil for road construction by traditional methods, and the cost is getting higher and higher, especially for plain areas such as the North China Plain, the Yangtze River Delta Plain, and the Pearl River Delta Plain. Some of them are basic farmland protection areas; at the same time, due to the special requirements of soil for road construction, it is becoming more and more difficult to select sites for borrow pits, which considerably restricts the cycle and cost of road construction, and it is often difficult to find soil sources for planned road construction. (For example, a large amount of soil is lacking in a certain section of the outer ring road in the western economic zone of the Pearl River Delta), and the construction of the national road transportation network is far from being completed, so it is imminent to solve the problem of soil acquisition.

Therefore, the existing traditional road construction technology urgently needs to be improved and developed.

Contents of the invention

The purpose of the present invention is to provide a method for building roads in situ by taking soil in situ. On the one hand, it can solve the problem of difficult soil taking for road construction, which is beneficial to environmental protection; on the other hand, it reduces the use of road construction machinery and simplifies project management. More environmentally friendly and low-carbon.

The present invention provides a method for building roads in situ by taking soil in situ, which is used for road engineering, and the steps include:

S1. Excavate the foundation earth in the red line range of the road in sections and mix it with cementitious material and water to form cementitious slurry;

S2. Extract the gelled slurry into the foaming mixing equipment and mix it with the foam produced by the foaming mixing equipment to form a foamed aggregate slurry;

S3. The foamed aggregate soil slurry is poured in-situ and backfilled to the road subgrade of each road section, and the road subgrade is formed through natural maintenance.

Only by using the excavated foundation soil on site, it is possible to prepare 2 to 10 times the volume of foamed polymer soil that meets the requirements of road engineering for the pouring of the roadbed, without borrowing external soil, which avoids damage to environmental resources such as land or forests. Destruction, completely solve the problem of difficult soil extraction for road construction by traditional methods, and do not need a lot of road construction machinery such as bulldozing and rolling, which is more environmentally friendly and low-carbon.

Further, in step S1, the gelled slurry is prepared by setting a mixing station; and/or a mixing pit is dug in an unconstructed area within the red line of the road, and the mixing pit is carried out in the mixing pit. Preparation of gelled slurry.

Further, step S1 includes:

S11. Plan out the backfill area on the soil pile area, pulping area and pre-construction road section at the road construction site;

S12. disposing the mixing pit and/or the mixing station in the pulping area;

S13. Excavating the foundation earthwork of the pre-construction road section according to the predetermined construction requirements of the road, and placing the excavated foundation earthwork at the soil pile area;

S14. Add the excavated foundation earthwork, the cementitious material and water into the mixing pit and/or mixing station for stirring treatment, so as to prepare the cementitious slurry.

Further, the specific steps of step S14 include:

According to the set cemented slurry preparation ratio standard, the excavated foundation earthwork, the cementitious material and water are added to the mixing pit and/or the mixing station in proportion, and are carried out by a stirring device. Thoroughly slurry and stir.

Further, the method of setting the mixing pit in step S12 is specifically:

The mixing pit is set on the section to be constructed within the red line of the road, the area of the mixing pit is 5-30% of the area of the pre-construction section, and the depth is 1-1.5 times the excavation depth of the construction section.

By digging a mixing pit in the red line of the road instead of building a mixing plant, while meeting the needs of mixing cementitious materials to obtain fillers, there is no need to spend the time and cost of disassembling the mixing plant.

Further, step S2 includes:

S21. Pump the gelled slurry into the foaming mixing device through the first delivery pump;

S22. Pump the foaming agent into the foaming mixing equipment through the second delivery pump, and automatically dilute in the foaming mixing equipment, and then perform physical foaming through an air compressor to form the foam;

S23. In the foaming and mixing equipment, the gelled slurry and the foam are mixed to form the foamed polymer soil slurry, and the foamed polymer soil slurry is transported under the thrust of the first delivery pump Push out from the foaming mixing equipment.

The force of the delivery pump at the input end is used to push the foamed aggregate soil out of the foaming mixing equipment, effectively avoiding the dissipation of the air bubbles in the foamed aggregate soil caused by the pumping process.

Further, the specific steps of step S3 include:

S31. Divide the plane of the subgrade part of the road into multiple pouring areas;

S32. Backfilling the foamed aggregate clay slurry into each pouring area.

By separating multiple pouring areas, the degree of foam dissipation in the foamed aggregate clay slurry is effectively reduced, and the quality of the foamed aggregate clay slurry is ensured after hardening.

Further, the size of each pouring area is 100-400 square meters.

Further, the composition of the cementitious material is single-component cement or a curing agent formed by mixing multiple components.

Further, the excavated foundation earthwork, cementitious material and water are all carried by vehicles and stirred by movable stirring equipment; the foaming mixing equipment is specifically a foaming mixing pump truck.

It can be seen from the above that the present application utilizes the in-situ foundation earthwork to prepare foamed aggregate soil by mixing. According to actual measurement, ^1m3 foundation earthwork can obtain ^2-10m3 foam aggregate soil after mixing, so there is no need to borrow earthwork at all. It can complete the road construction project, completely solve the problem of difficult soil acquisition for road construction, and effectively protect environmental resources such as land or forests; at the same time, it does not need to use road construction machinery such as bulldozing and rolling, and has obvious advantages in environmental protection and low carbon.

Other features and advantages of the present application will be set forth in the ensuing description and, in part, will be apparent from the description, or can be learned by practicing the embodiments of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

Fig. 1 is a flow chart of a method for building roads in situ by borrowing soil in situ provided by the embodiment of the present application.

Fig. 2 is a schematic diagram of specific construction in the embodiment of the present application.

FIG. 3 is a schematic diagram of a planned construction road section in the embodiment of the present application.

Fig. 4 is another schematic diagram of specific construction in the embodiment of the present application.

Fig. 5 is a schematic diagram of the transfer path of earthwork, cementitious slurry and foamed aggregate soil in the embodiment of the present application.

Label description:

1. Road red line range; 11. Pre-construction road section; 2. Backfill area; 3. Pulping area; 31. Gelling slurry; 4. Soil pile area; 5. Foam board; 6. Foaming and mixing equipment.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them. The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

It should be noted that, in general, the range defined by the road red line range 1 is larger than the road subgrade required for construction. Therefore, the road red line range 1 below includes construction road sections and non-construction road sections, and the construction road section is the road subgrade that needs to be filled. The part of the road, including the road section to be constructed and the road section to be constructed. The road section to be constructed is a road section that is not ready for construction, and the road section to be constructed is a road section that is ready to be constructed. Generally, during road construction, construction will not be carried out on the entire road red line range 1 at the same time. Most of the time, construction will be carried out section by section, so there are road sections to be constructed and pre-construction sections; while the rest of the road red line range 1 except the construction section is non-construction sections.

In addition, the non-construction area within the red line of the road includes road sections to be constructed and non-construction road sections.

In addition, there is no substantial difference between the road subgrade and the backfill area 2. It is only for the convenience of understanding the construction process of this application. The backfill area 2 is set and filled to form the road subgrade.

For areas such as the North China Plain, the Yangtze River Delta Plain, and the Pearl River Delta Plain, most of the road projects are filled subgrades, and there are generally two construction methods: one is to borrow conventional earthwork and build subgrades by bulldozing and rolling; Second, use methods such as foam light soil to build roadbeds. For subgrade construction with borrowed earthwork, it is difficult to obtain soil; for subgrade construction with foam light soil, it is necessary to excavate part of the foundation soil for replacement, resulting in more spoils and high cost.

In some embodiments, a method for building roads in situ by borrowing soil in situ is used for building roads, the steps of which include:

S1. Excavating the foundation earth in the red line range 1 of the road in sections and mixing it with cementitious material and water to form cementitious slurry 31;

S2. Extract the gelling slurry 31 into the foaming mixing device 6 and mix it with the foam generated by the foaming mixing device 6 to form a foamed polymer soil slurry;

S3. The foamed polymer soil slurry is cast-in-place and backfilled to the road subgrade of each road section, and the strength is formed through natural maintenance, and then the road subgrade is formed.

In comparison, the in-situ road construction method of this embodiment has the following advantages: 1. No need to borrow earthwork, which solves the problem of difficult soil acquisition; 2. Through the proportion design of foam aggregate soil, the excavated The foundation soil is used as one of the raw materials to solve the problem of abandonment, so the environmental protection advantage is obvious. At the same time, the use of the foundation soil as one of the raw materials has considerable economic efficiency.

For example, referring to a certain section of the Outer Ring Road in the Western Economic Zone of the Pearl River Delta, the subgrade was built by borrowing conventional earthwork by bulldozing and rolling. There are only 857,900 cubic meters of earthwork available at the site, and there are 343,150 cubic meters of earthwork gaps, resulting in the need to borrow soil from other places for filling.

If the in-situ road construction method of borrowing soil in this embodiment is adopted, there is no need to borrow 343,150 cubic meters of earth, which can effectively avoid soil erosion caused by borrowing soil and damage the environment. At the same time, the use of in-situ earthwork can save 50%-90% (saving about 600,000-1.08 million cubic meters of earthwork), greatly reducing the quantity and time of excavating earthwork, and shortening the project cycle.

For example, according to the actual application data, the construction of a 1km road section, according to the grade of the road to be built, the amount of earthwork in the prior art method:

About 50,000 to 70,000 cubic meters for secondary roads and above;

Class 3 and Class 4 roads, about 40,000-65,000 cubic meters.

And in the mode among above-mentioned embodiment, its earthwork amount:

For secondary roads and above, about 6,700 to 10,500 cubic meters;

Three-level and four-level roads, about 0.43-0.77 million cubic meters.

Obviously, a large amount of earthwork demand is reduced, thereby ensuring that road construction can be completed using only in-situ foundation soil, especially for plain areas lacking soil, road construction is no longer restricted by the difficulty of obtaining soil, and the land is effectively protected or mountain forests and other environmental resources, more low-carbon and environmentally friendly.

Further, in actual application, the earth excavated from the road subgrade is used as one of the raw materials for preparing foam aggregate soil, and ^1m3 of earthwork can be processed to obtain ^2-10m3 foam aggregate soil, avoiding the need for soil borrowing and abandonment lead to environmental damage.

Further, the existing traditional road construction technology generally requires a large number of dump trucks for soil transportation, as well as bulldozers and road rollers for flattening and rolling. However, in the in-situ road construction method of this embodiment, the foam aggregate soil The strength can be formed after short-term maintenance for cast-in-place, without bulldozing and rolling, avoiding the use of a large number of machinery, simpler project management, and lower carbon environmental impact.

Furthermore, when the construction road section is too long, the simultaneous construction of multiple road sections can be realized by means of segmented construction, and the above steps can be carried out for each road section, which can greatly speed up the progress of the project.

It should be noted that, in this embodiment, the foaming agent is first subjected to foaming treatment in a physical form to form a foam, and then the foam is fully mixed with the gelled slurry 31 to finally obtain the foamed polymer clay slurry. Among them, by adjusting the amount of foaming agent and cementitious slurry 31, foamed polymer soil with different volume ratios and different strength requirements can be realized, so as to meet the design requirements of different heights of roadbeds and strengths of different parts of roadbeds.

It should also be noted that natural conservation refers to the use of natural conditions to make the foamed aggregate slurry naturally harden to form a foamed aggregate with a certain strength. At some point, the surface of the foamed aggregate can be covered with appropriate materials and watered to Maintain the proper temperature and humidity conditions required for hardening.

In some embodiments, the cementitious slurry 31 in step S1 is prepared by setting up a mixing station; and/or a mixing pit is dug in an unconstructed area within the range 1 of the red line of the road, and the cementitious material is mixed in the stirring pit. Preparation of slurry 31 .

When the construction length exceeds a certain range, the amount of gelled slurry 31 is required to be large, so the gelled slurry 31 can be prepared by setting up a mixing station.

For example, in some embodiments, the gel materials such as earth, water, cement and curing agent are directly input into the mixing station for mixing, which can be carried out by setting the belt feeder to transport the earth, and setting the screw conveyor to transport the cement and solidify Agents and other gel materials and set the water pump to pump water into the implementation.

When the construction length is within a certain range, the amount of cementitious slurry 31 required is small, and then the cementitious slurry 31 can be prepared by digging a mixing pit.

The construction party can dig a mixing pit instead of building a mixing plant. It only needs to use an excavator to dig out a simple deep pit, and there is no need to assemble and disassemble the mixing plant, which reduces the preparation period in the early stage and simplifies the finishing work in the later stage.

In practical application, after the earthwork is put into the mixing pit, water is poured into the mixing pit, the earthwork and water are fully mixed to form mud, and then gel materials such as cement and curing agent are added to the mixing pit, and the stirring is continued fully once. A gelled slurry 31 is formed.

In some embodiments, depending on the actual situation, a mixing pit and a mixing station may be dug at the same time to prepare the gelled slurry 31 .

For example, after the earthwork is put into the mixing pit, water is poured into the mixing pit. After the earthwork and water are fully mixed to form mud, the mud is pumped from the mixing pit to the mixing station for mixing, and then cement and cement are added to the mixing station. Gel materials such as curing agent form gelling slurry 31 in the mixing station, and finally the mixing station is connected to the foaming mixing equipment 6, and the gelling slurry 31 is extracted into the foaming mixing equipment 6 to form the final foamed polymer soil slurry material.

In some embodiments, step S1 includes:

S11. Plan the backfill area 2 on the soil pile area 4, the pulping area 3 and the pre-construction road section 11 at the road construction site;

S12. setting the mixing pit and/or the mixing station in the pulping area 3;

S13. Excavate the foundation earthwork of the pre-construction road section 11 in depth according to the predetermined construction requirements of the road, and place the excavated foundation earthwork in the soil pile area 4;

S14. Add the excavated foundation earth, cementitious material and water into the mixing pit and/or the mixing station for stirring treatment, so as to prepare the cementitious slurry 31 .

In this embodiment, the backfill area 2 is the area where road filling is required on the pre-construction road section 11 within the red line range 1 of the road. After preparing the foamed polymer soil slurry, it will be backfilled into the backfill area 2 to fill up the road. The earth excavated in the backfill area 2 can be temporarily stored in the soil accumulation area 4 (the excavated earth can also be temporarily placed in the transport vehicle, and the transport vehicle should also be regarded as the soil accumulation area 4).

It should be noted that when the construction road section is too long, it can also be constructed in sections as in the above-mentioned embodiment, and each road section is provided with a backfill area 2, a pulping area 3, and a soil accumulation area 4 to realize simultaneous construction of multiple road sections.

Further preferably, in the range 1 of the red line of the road, the soil accumulation area 4, the pulping area 3 and the backfill area 2 on the pre-construction road section 11 are planned to make full use of the internal space of the red line range 1 of the road to avoid excessive occupation of the red line range 1 of the road Space.

Further preferably, the length of the pre-construction section 11 is set to be 30-100 meters, so as to avoid the backfilling area 2 being too far away from the pulping area 3, resulting in difficulty in transporting the foamed aggregate slurry.

Further preferably, the soil accumulation area 4 is set in a non-construction area within the range 1 of the red line of the road.

In some embodiments, the specific steps of step S14 include:

According to the set cemented slurry preparation ratio standard, the excavated foundation soil, cementitious material and water are added to the mixing pit and/or mixing station in proportion, and the mixing device is used to fully slurry and mix.

In some embodiments, the specific steps of step S3 include:

S32. Backfilling the foamed aggregate clay slurry into each cast area.

In this embodiment, because the foamed polymer soil has good fluidity and contains a large number of air bubbles inside, in actual application, when the poured foamed polymer soil exceeds a certain volume, the internal bubbles are easy to dissipate. In order to ensure the foamed polymer soil after solidification Quality, when the volume of pouring required for the subgrade part of the road is too large, it is necessary to pour the subgrade part of the road in different areas, so as to ensure the quality of the foamed polymer soil in each area.

Further preferably, each pouring area in step S31 is separated and formed by foam boards 5 or wooden splints. In practical application, after the foamed aggregate slurry is hardened, the foam board 5 does not need to be taken out, and the elasticity of the foam board 5 can play a compensating role, and the expansion and contraction of the foamed aggregate can be effectively prevented by deforming and adapting to the expansion and contraction of the foamed aggregate. Cracking caused by changes in ambient temperature after long-term use.

In some embodiments, the percentage of the area of the mixing pit to the area of the pre-construction road section 11 is calculated according to the following formula:

Among them, X is the percentage of the area of the mixing pit to the area of the pre-construction road section 11, B is the area of each pouring area, and A is the area of the pre-construction road section 11.

The mixing pit matching the pre-construction road section 11 can be calculated through this formula. The so-called matching mixing pit means that the cementitious slurry 31 prepared each time in the mixing pit can completely fill at least one pouring area. A reasonable pit size can prevent the cementitious slurry 31 prepared each time from being unable to completely fill a pouring area, resulting in the pouring area needing to be filled in multiple times, which will affect the quality of the final foamed polymer soil; or each prepared The gelled slurry 31 is too much, resulting in waste of the remaining gelled slurry 31 .

In some embodiments, the method of setting the mixing pit in step S12 is specifically:

The mixing pit is set on the road section to be constructed within the red line range 1 of the road. The area of the mixing pit is 5-30% of the area of the pre-construction section 11, and the depth is 1-1.5 times the excavation depth of the construction section.

Further preferably, the area of each pouring area is 100-400 square meters.

Setting the mixing pit according to the above embodiment can ensure that the foamed polymer soil slurry can be continuously transported, and at least one pouring area can be filled according to the construction requirements each time. For example, the area of the pre-construction section 11 is 1500m ³ , the size of the mixing pit is set to 20% of the area of the pre-construction section 11, and the depth is 1 times the excavation depth of the construction section. The size of each pouring area is 150m ³ , and there are 10 pouring area, the mixing pit can prepare 300m ³ of foamed polymer soil slurry each time, and can fill two pouring areas.

It should be noted that, in actual application, if the red line range 1 of the road is too long, it will be divided into multiple pre-construction road sections, the area of each road section is generally 100-200 square meters, and the depth of the mixing pit is generally not more than 1.5 meters. The area is controlled by 5-10㎡.

Further preferably, the size of each pouring area is 200-300 square meters.

Further preferably, the specific step of step S32 is that the height of each backfill pouring in each pouring area is 0.3-1 meter, so as to avoid collapse caused by pouring too high.

In some embodiments, step S2 includes:

S21. Pump the gelled slurry 31 into the foaming mixing device 6 through the first delivery pump;

S22. The foaming agent is pumped into the foaming mixing device 6 through the second delivery pump, and is automatically diluted in the foaming mixing device 6, and then physically foamed by an air compressor to form a foam;

S23. In the foaming mixing device 6, the gelled slurry 31 is mixed with the foam to form a foamed polymer soil slurry, and the foamed polymer soil slurry is pushed out from the foaming mixing device 6 under the thrust of the first delivery pump.

In this embodiment, the foaming mixing device 6 is provided with two independent input ports and one output port, and the two input ports are respectively connected to the first delivery pump and the second delivery pump, while the output end is not provided with a third delivery pump. Pump: the first delivery pump is used to send the gelled slurry 31 into the foaming mixing equipment 6, and the second delivery pump is used to send the foaming agent into the foaming mixing equipment 6, and the two are mixed in the foaming process. Mix in the equipment 6 to form the foamed polymer soil, and the force of the first delivery pump acts on the foamed polymer soil at the same time to make it pump out at the output end of the foaming mixing device 6. This method can effectively protect the air bubbles in the foamed polymer soil (If the third delivery pump is set at the output end to pump out the foamed polymer soil, it is easy to cause the bubbles to dissipate).

In addition, in actual application, the foaming and mixing equipment 6 can pump the gelling slurry 31 in real time, foam the foaming agent in real time, and mix the gelling slurry 31 and the foam in real time, so as to achieve the real-time delivery of the foamed polymer soil. way to achieve production goals.

It should be noted that the foaming and mixing equipment 6 can be a light soil integrated preparation machine in the prior art, a foaming light soil preparation station and a foaming mixing pump truck (such as a slurry foam mixing distribution rod pump truck), but not only limited to this. In addition, the foaming agent must pass through the foaming and mixing equipment 6 for physical foaming to form a foam, and the foaming agent is directly injected into the cementitious slurry 31 and cannot form the desired foamed polymer soil.

In some embodiments, the cementitious material is composed of single-component cement or a curing agent formed by mixing multiple components.

For example, the mass ratio of water and solid materials (including curing agent and foundation earthwork) is 1:1.04;

The mass ratio of curing agent to foundation earthwork is 1:1;

Composition of curing agent: 12 parts of cement, 40 parts of mineral powder, 36 parts of white mud powder, 12 parts of desulfurized gypsum;

Foaming agent is SRN2 foaming agent, and it is composed of: 39wt% fatty alcohol polyoxyethylene ether sodium sulfate, 9wt% triethanolamine, 5.5wt% sodium lauryl sulfate, 3wt% diethanol monoisopropyl Alcohol amine, 24wt% sodium α-alkenyl sulfonate, 17wt% ethylene glycol butyl ether and 2.5wt% 12-14 mixed alcohol (the weight ratio of carbon dodecanol to carbon tetradecyl alcohol is 7:3).

Stir and mix the foundation earthwork and water for 20 minutes (80r/min) according to the proportion, then add the curing agent and stir and mix for 25 minutes (80r/min) to obtain the mixed slurry. Then the SRN2 foaming agent of 0.25 parts by weight is diluted 65 times to obtain foaming agent solution, and the foaming agent solution prepared is injected into the foaming mixing device 6, and compressed air is fed into physical foaming to obtain foam (The resulting foam was stable in volume for about 16 min when stored alone). Finally, add the foam into the mixed slurry and continue to stir and mix for 12min (55r/min) to obtain the foamed polymer soil slurry.

For another example, the mass ratio of water to solid materials (including curing agent and foundation earthwork) is 1:1.15.

The mass ratio of curing agent to foundation earthwork is 1:1.

Composition of curing agent: 8 parts of cement, 42 parts of mineral powder, 38 parts of white clay powder, and 12 parts of desulfurized gypsum.

Foaming agent is SRN2 foaming agent, and its composition is: the fatty alcohol polyoxyethylene ether sodium sulfate of 66wt%, the triethanolamine of 12wt%, the sodium lauryl sulfate of 10wt%, the diethanol monoisopropanol of 7wt% amine and 5 wt% lauryl amidopropyl betaine.

Stir and mix the foundation earthwork and water for 20 minutes (80r/min) according to the proportion, then add the curing agent and stir and mix for 25 minutes (80r/min) to obtain the mixed slurry. Then the SRS1 whipping agent of 0.25 parts by weight is diluted 80 times to obtain whipping agent solution, and the whipping agent solution prepared is injected in the foaming mixing equipment, and compressed air is fed into physical foaming to obtain foam ( The resulting foam was stable in volume for about 16 minutes when stored alone). Finally, the foam was added to the mixed slurry and continued to stir and mix for 12 minutes (55 r/min) to obtain a foamed polymer clay slurry.

In some embodiments, the composition of the cementitious material is not limited to the above-mentioned cement and curing agent. It can also be used to prepare gelled slurry 31, which can absorb a large amount of solid waste to a considerable extent, and its environmental protection significance is great, which is beneficial to the protection of the surrounding environment.

In some embodiments, the excavated foundation earthwork, cementitious material and water are all carried by vehicles and stirred by a movable stirring device; the foaming mixing device 6 is specifically a foaming mixing pump truck.

In this embodiment, the foundation earthwork, cementitious material and water are carried by vehicles, together with movable mixing equipment and foaming mixing pump trucks, which is beneficial to achieve the efficient operation effect of fast construction and fast movement.

In some embodiments, before step S1, a step is further included: performing surface cleaning on the red line range 1 .

In this document, relational terms such as first and second etc. are used only to distinguish one entity or operation from another without necessarily requiring or implying any such relationship between these entities or operations. Actual relationship or sequence.

The above descriptions are only the embodiments of the present application, and are not intended to limit the protection scope of the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

A method for building roads in situ by borrowing soil in situ, used for road engineering, is characterized in that the steps include:

S1. Excavate the foundation earth in the red line range of the road in sections and mix it with cementitious material and water to form cementitious slurry;

S2. Extract the gelled slurry into the foaming mixing equipment and mix it with the foam produced by the foaming mixing equipment to form a foamed aggregate slurry;

S3. The foamed aggregate soil slurry is poured in-situ and backfilled to the road subgrade of each road section, and the road subgrade is formed through natural maintenance.
The in-situ road construction method according to claim 1, characterized in that, in step S1, the gelled slurry is prepared by setting a mixing station; and/or within the scope of the red line of the road A mixing pit is dug in the unconstructed area, and the preparation of the gelled slurry is carried out in the mixing pit.
The in-situ road construction method according to claim 2, characterized in that step S1 comprises:

S11. Plan out the backfill area on the soil pile area, pulping area and pre-construction road section at the road construction site;

S12. disposing the mixing pit and/or the mixing station in the pulping area;

S13. Excavating the foundation earthwork of the pre-construction road section according to the predetermined construction requirements of the road, and placing the excavated foundation earthwork at the soil pile area;

S14. Add the excavated foundation earthwork, the cementitious material and water into the mixing pit and/or mixing station for stirring treatment, so as to prepare the cementitious slurry.
The in-situ road construction method according to claim 3, characterized in that the specific steps of step S14 include:

According to the set cemented slurry preparation ratio standard, the excavated foundation earthwork, the cementitious material and water are added to the mixing pit and/or the mixing station in proportion, and are carried out by a stirring device. Thoroughly slurry and stir.
The in-situ road construction method according to claim 3, characterized in that the method of setting the mixing pit in step S12 is specifically:

The mixing pit is set on the section to be constructed within the red line of the road, the area of the mixing pit is 5-30% of the area of the pre-construction section, and the depth is 1-1.5 times the excavation depth of the construction section.
The in-situ road construction method according to claim 1, characterized in that step S2 comprises:

S21. Pump the gelled slurry into the foaming mixing device through the first delivery pump;

S22. Pump the foaming agent into the foaming mixing equipment through the second delivery pump, and automatically dilute in the foaming mixing equipment, and then perform physical foaming through an air compressor to form the foam;

S23. In the foaming and mixing equipment, the gelled slurry and the foam are mixed to form the foamed polymer soil slurry, and the foamed polymer soil slurry is transported under the thrust of the first delivery pump Push out from the foam mixing equipment.
The in-situ road construction method according to claim 1, characterized in that the specific steps of step S3 include:

S31. Divide the plane of the subgrade part of the road into multiple pouring areas;

S32. Backfilling the foamed aggregate clay slurry into each pouring area.
The in-situ road construction method according to claim 7, characterized in that the area of each pouring area is 100-400 square meters.
The in-situ road construction method according to claim 1, wherein the composition of the cementitious material is a single-component cement or a curing agent formed by mixing multiple components.
The in-situ road construction method according to claim 1, characterized in that, the excavated foundation earthwork, cementitious material and water are all carried by vehicles, and are stirred by movable stirring equipment; The above-mentioned foaming and mixing equipment is specifically a foaming and mixing pump truck.