KR102577695B1 - Backfilling composition and auxiliary base material composition using stone dust sludge for the road excavation restoration work, road paving system, and construction method using the same - Google Patents

Abstract

The present invention relates to a backfill material using stone dust sludge, a subbase material, a road paving system, and a construction method thereof. More specifically, it is a backfill composition obtained by mixing stone dust sludge with CLSM, which is a mixture of water and Portland cement, It relates to a subbase material composition made by mixing stone sludge and aggregate with CLSM mixed with water and Portland cement, and a road paving system and construction method using the same.

Description

Backfilling composition and auxiliary base material composition using stone dust sludge for the road excavation restoration work, road paving system, and construction method using the same}

The present invention relates to a backfill material using stone dust sludge, a subbase material, a road paving system, and a construction method thereof. More specifically, it is a backfill composition obtained by mixing stone dust sludge with CLSM, which is a mixture of water and Portland cement, It relates to a subbase material composition made by mixing stone sludge and aggregate with CLSM mixed with water and Portland cement, and a road paving system and construction method using the same.

Generally, CLSM (Controlled Low Strength Material) refers to a cement-based slurry material whose compressive strength at 28 days is controlled to be 8.3 MPa or less.

The CLSM is also called fluid backfill, quick-setting fluidized backfill, Controlled Density Fill (CDF), Controlled Strength Fill (CSF), and flowable fly ash, and has self-leveling ability and self-leveling properties. Compaction, fluidity, and strength can be adjusted, and re-excavation is easy after construction.

These CLSMs are mainly manufactured by adding materials such as water, Portland cement, fly ash, coarse and fine-grained aggregates, and in-situ soil, but some CLSMs are manufactured using only water, Portland cement, and fly ash.

Also, mixing of CLSM uses ready-mix concrete trucks, pug mills, concrete mixers, etc. In general, the mixing method using ready-mix concrete trucks is widely used, but when mixing large quantities of CLSM, a plant-type mixing device may be used. do.

This CLSM is a structure backfilling process that backfills the original ground surface after construction of the structure in the excavated area to construct the structure foundation, sewer pipe, retaining wall, etc., a pipe bedding process that is constructed on the lower part of the excavated surface when burying a pipe, and a cause of road cave-in. It is widely used in the cavity filling process under roads.

Meanwhile, waste rock dust generated during the processing of aggregates or stones is used as landfill material for building civil engineering work, as fill material, road base material, and for covering soil.

In detail, stone dust is classified as inorganic sludge among waste materials subject to recycling. Due to the nature of the material, there is concern about dust generation, so it is generally used in the form of stone dust sludge after going through a water treatment process.

To produce stone dust sludge, wet stone dust sludge is dried, processed into powder, and then subjected to hydrothermal synthesis using a high-temperature and high-pressure autoclave or a calcination process using a rotary kiln to produce stone dust sludge. I'm doing it.

However, there has been insufficient research on using CLSM and stone dust sludge, which has the above characteristics, as backfill and subbase material for road excavation and restoration construction, and shows the fluidity required for construction and good strength after construction. There is a constant need to develop backfill and subbase materials.

The present invention was created to solve the above-described conventional problems, and is a backfill and auxiliary material for use as a backfill and subbase material for road excavation and restoration construction using CLSM, stone dust sludge, and aggregate. Provides the composition of layer materials and road paving systems and construction methods using them.

The composition of the backfill material, subbase material, construction equipment, and construction method using stone dust sludge of the present invention to achieve the above technical problem is a backfill material mixed with stone dust sludge in CLSM mixed with water and Portland cement. The composition is characterized by a subbase material composition made by mixing stone sludge and aggregate with CLSM mixed with water and Portland cement, and a road paving system and construction method using the same.

The backfill material and subbase material using stone dust sludge of the present invention having the above configuration are effective in ensuring a uniform degree of compaction during road excavation restoration.

In addition, it has the effect of satisfying the fluidity and strength required for backfill and subbase construction on roads.

1 is a block diagram of a mixing device for backfill or subbase material according to an embodiment of the present invention;
Figure 2 is a configuration diagram of a hopper device for supplying backfill or subbase material in an embodiment of the present invention;
Figure 3 is a cross-sectional schematic diagram of a road constructed using the backfill and subbase material of the present invention;
Figure 4 is a flowchart of the construction method of the present invention.

Hereinafter, with reference to the drawings, the configuration of the backfill material and subbase material using stone dust sludge of the present invention, and the road paving system and construction method using the same will be described.

However, the disclosed drawings are provided as examples so that the idea of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other aspects.

In addition, if there is no other definition in the terms used in the present invention specification, they have meanings commonly understood by those skilled in the art to which the present invention pertains, and the gist of the present invention is summarized in the following description and accompanying drawings. Detailed descriptions of known functions and configurations that may be unnecessarily obscure are omitted.

First, the configuration of the backfill using stone dust sludge of the present invention will be described.

The backfill material using stone dust sludge of the present invention is a composition in which CLSM and stone dust sludge are mixed. Specifically, it is a composition in which stone dust sludge is mixed with CLSM, which is a mixture of water and Portland cement.

The backfill material of the present invention having the above configuration is mainly used for filling cavities during road excavation and restoration work.

The composition of the backfill material of the present invention includes 9 to 23% by weight of cement, 30 to 35% by weight of water, and 47 to 56% by weight of stone dust sludge.

Accordingly, as shown in Table 1 below, the compositions of the examples of the backfill material of the present invention were formulated to include 148 to 283 Kg of cement, 487 to 510 Kg of water, and 762 to 797 Kg of stone dust sludge.

In addition, according to each example, the amount of water in the stone dust sludge was formulated to be 222 to 232 Kg, and the W/B was formulated to be 250 to 500%.

division Cement (Kg) Water (Kg) Stone dust sludge (Kg) In stone dust sludge
Quantity of water (Kg) W/B (Water Binder Ratio) (%) Example 1 148 510 797 232 500% Example 2 164 508 792 230 450% Example 3 183 504 788 229 400% Example 4 208 500 782 227 350% Example 5 240 495 773 225 300% Example 6 283 487 762 222 250%

Here, the stone dust sludge produced by domestic company L, a crushed aggregate producer located in Gyeonggi-do, was used, and the rate of passage through a 5 mm sieve was 100%, the rate of passage through a 0.075 mm sieve was 47.54%, and the maximum dry density was 1.694 g/ ^cm3 . Stone dust sludge was used.

In addition, the cement used was ordinary Portland cement manufactured by domestic company A that complies with the regulations of KS L 5210.

In addition, when mixing the backfill using the stone dust sludge, a flow test was conducted in advance considering the water content of the stone dust sludge, and the amount of each material was adjusted so that the W/B was 250 to 500%.

In order to evaluate the fluidity of the examples of the backfill of the present invention as described above, the fluidity of the backfill was evaluated using the American ASTM D 6103 "Standard Test Method for Flow Consistency of Controlled Low Strength Material" method.

In addition, in order to evaluate the material separation resistance (bleeding) of backfill using stone dust sludge, the test method introduced in "Fluidization Treatment Method of Soil" of the Fluidization Treatment Technology Management Research Group of the Japan Fluidization Treatment Technology Research Organization was adopted. An evaluation was performed.

In addition, in order to measure the compressive strength of backfill using stone dust sludge, ASTM D 4832 "Standard Test Method for Preparation and Testing of Controlled Low Strength Material (CLSM Test Cylinders)" is followed, and the test specimen has a ratio of height and diameter. The experiment was conducted by manufacturing a specimen with a height of 100 mm and a diameter of 50 mm using a 2:1 cylindrical mold.

In addition, samples were collected at 7 and 28 days of age and SEM and

As a result of testing the characteristics of the backfill material using the stone dust sludge of the present invention as described above, the fluidity of the examples of the backfill material of the present invention tended to decrease as W/B decreased.

In addition, the appropriate fluidity of the backfill to ensure compaction and filling properties is reported to be 200 mm or more in ACI 229R, and the backfill in the embodiments of the present invention all satisfied the target value at a W/B of 250% or more.

In addition, as a result of the bleeding test of the backfill of the examples of the present invention using stone dust sludge, it was measured at 0.76% to 0.86%, and there was no consistent trend according to W/B.

It is believed that bleeding varies slightly depending on the water content state of the stone dust sludge, and the quality standard for bleeding is that the required performance of the backfill specified in the relevant Japanese standards is less than 3.0%, which is consistent with the examples of the present invention. The fillers met these criteria.

In addition, as a result of testing the compressive strength of the backfill material of the embodiments of the present invention using stone dust sludge, the initial strength at 7 days, which is the ACI 229R standard, was 0.3 MPa or more and was satisfied in all W/Bs, and for review of re-excavability The compressive strength at 28 days of age was the same as the initial strength, and as the W/B value increased, the strength development decreased.

Therefore, by reviewing related technical data and standards, the strength condition for re-excavability of backfill was selected as 1.4 MPa (28-day strength) or less according to ACI 229R, and secured a strength of 1.4 MPa or less at 28 days. In order to do this, it is judged that the W/B must be mixed at more than 300%.

Meanwhile, the compressive strength test results of the backfill materials of the examples of the present invention were performed by age, and the results of SEM and EDS analysis of the backfill materials using stone dust sludge showed that as W/B decreases and age increases, hydration reaction with cement occurs. It was confirmed that the internal tissue became more dense and the Ca element content increased.

In addition, as a result of has increased.

Therefore, by reviewing CLSM-related standards and standards (ACI 229R and Japanese related regulations, etc.), preferably, the W/B of the backfill of the present invention is 300% or more, and the fillability and workability of the backfill by mixing factor As a result of considering performance evaluation, subsequent processes, re-excavability, etc., more preferably, the W/B of the backfill of the present invention is 350%.

Next, the configuration of the subbase material using stone dust sludge of the present invention will be described.

The subbase material using stone dust sludge in an embodiment of the present invention is a composition that is a mixture of CLSM, stone dust sludge, and aggregate. Specifically, it is a composition in which stone dust sludge and aggregate are mixed with CLSM, which is a mixture of water and Portland cement.

The subbase material of the present invention having the above-mentioned configuration is laminated on the upper side of the above-described backfill material in the work of filling cavities on the road during road excavation and restoration work, and asphalt forming the surface layer of the road is on the upper side of the subbase material laminated in this way. The layers are stacked.

The composition of the subbase material of the present invention includes 11 to 18% by weight of cement, 30 to 33% by weight of water, 48 to 50% by weight of stone sludge, and 4 to 10% by weight of recycled fine aggregate.

Accordingly, as shown in Table 2 below, the compositions of examples of the subbase material of the present invention were formulated to include 183 Kg of cement, 504 Kg of water, 788 Kg of stone dust sludge, and 79 to 158 Kg of recycled fine aggregate. Comparative Example 1 is an example in which the composition did not contain recycled fine aggregate.

In addition, according to each example, the amount of water in the stone dust sludge was formulated to be 229 kg, and the proportion of recycled fine aggregate (wt.%) was formulated to be 0 to 20%.

division recycled fine aggregate
Proportion (wt.%) Cement (Kg) Water (Kg) stone sludge
(Kg) recycled fine aggregate
(Kg) Amount of water in stone dust sludge (Kg) Comparative Example 1 0% 183 504 788 229 Example 1 10% 183 504 788 79 229 Example 2 20% 183 504 788 158 229

In addition, the composition of another example of the subbase material of the present invention includes 9 to 19% by weight of cement, 13 to 15% by weight of water, 41 to 45% by weight of stone dust sludge, and 27 to 31% by weight of coarse aggregate.

Accordingly, as shown in Table 3 below, compositions of other examples of the subbase material of the present invention were formulated to include 183 to 275 Kg of cement, 261 to 269 Kg of water, 812 to 837 Kg of stone dust sludge, and 542 to 558 Kg of coarse aggregate.

In addition, according to each example, the amount of water in the stone dust sludge was formulated to be 322 to 332 Kg, and the W/B of the composition was formulated to be 212 to 317%.

division W/B (Water Binder Ratio) (%) cement
(Kg) water
(Kg) stone sludge
(Kg) coarse aggregate
(Kg) stone sludge
amount of water in
(Kg) Example 3 317% 189 269 837 558 332 Example 4 212% 275 261 812 542 322

In addition, the composition of another example of the subbase material of the present invention is 14 to 21% by weight of cement, 10 to 13% by weight of water, 1 to 3% by weight of quick setting material, 41 to 44% by weight of stone dust sludge, and 27 to 29% by weight of coarse aggregate. Includes %.

Accordingly, as shown in Table 4 below, compositions of other examples of the subbase material of the present invention were formulated to include 275 Kg of cement, 208.8 to 234.9 Kg of water, 26.1 to 52.2 Kg of quick-setting material, 812 Kg of stone dust sludge, and 542 kg of coarse aggregate.

In addition, according to each example, the amount of water in the stone dust sludge was formulated to be 322 Kg, and the W/B of the composition was formulated to be 212%.

division W/B (Water Binder Ratio) (%) cement
(Kg) water
(Kg) quick payment
(Kg) stone sludge
(Kg)
coarse aggregate
(Kg) stone sludge
amount of water in
(Kg) Example 5 212 275 234.9 26.1 812 542 322 Example 6 212 275 221.9 39.1 812 542 322 Example 7 212 275 208.8 52.2 812 542 322

The stone dust sludge of the subbase material of the embodiments of the present invention is produced by domestic company L, a crushed aggregate producer located in Gyeonggi-do, and has a 5 mm sieve passing rate of 100% and a 0.075 mm sieve passing rate of 47.54%, and a maximum dry density of 1.694 g. /cm3, stone dust sludge with an average water content of 39.67% was used.

In addition, the cement of the subbase material in the examples of the present invention was ordinary Portland cement manufactured by a domestic company A that complied with the provisions of KS L 5210.

In addition, the recycled fine aggregate used in the subbase material of the embodiment of the present invention was waste concrete fine aggregate of 8 mm or less and a dry density of 2.45 g/cm3 produced during the waste concrete crushing process of Daejeon G company.

In addition, the coarse aggregate used in the subbase material of another example and another example of the present invention was crushed granite from Chungcheongnam-do and had a maximum coarse aggregate size of 25 mm.

In addition, the W/B of the subbase material in the examples of the present invention was fixed at 400%, and the recycled fine aggregate was added at 10% and 20% by weight of stone dust sludge.

In addition, in the subbase material of another example of the present invention, W/B was set to 212% and 317%, and the amount of coarse aggregate mixed was 40% of the total amount of stone dust sludge and coarse aggregate.

In order to evaluate the fluidity of the subbase material using the recycled fine aggregate of the embodiment of the present invention constructed as described above, the fluidity was tested in accordance with the American ASTM D 6103 "Standard Test Method for Flow Consistency of Controlled Low Strength Material".

In addition, in order to test the fluidity of the subbase material using the coarse aggregate of another example of the present invention, an experiment was conducted in accordance with KS F 2402 "Slump test method for concrete."

In addition, in order to test the strength of the subbase material using the recycled fine aggregate of the embodiment of the present invention, the strength was tested in accordance with ASTM D 4832 "Standard Test Method for Preparation and Testing of Controlled Low Strength Material (CLSM Test Cylinders)" in the United States. .

In addition, in order to evaluate the compressive strength of the subbase material using coarse aggregate in another example of the present invention, the compressive strength was tested in accordance with KS F 2405 "Testing method for compressive strength of concrete."

As a result, the fluidity of the subbase material using the recycled fine aggregate of the embodiment of the present invention tended to decrease as the amount of recycled fine aggregate added increased.

In addition, the fluidity of the subbase material using the recycled fine aggregate of the embodiment of the present invention decreased by 4.8% and 7.1%, respectively, when the added amount of the recycled fine aggregate was 10% and 20%, which is due to the nature of the high absorption rate of the recycled fine aggregate by the relief mortar. It is believed that this is because the ratio (binder + stone sludge + aggregate) / water was increased without increasing the amount of water.

In addition, as a result of the slump test of the subbase material using the coarse aggregate of another example of the present invention, it was confirmed that the mixing ratio of coarse aggregate was 40% and W/B was 317% and 212%, respectively, at 130 mm and 120 mm.

In addition, as a result of testing the compressive strength of the subbase material using the recycled fine aggregate of the embodiment of the present invention, the compressive strength tended to increase somewhat as the recycled fine aggregate increased.

Specifically, when the added amount of recycled fine aggregate was 10% and 20%, the 28-day strength increased by 7.5% and 14.8%, respectively, and this trend was also due to the high absorption rate of recycled fine aggregate and the ratio of ((binder + stone sludge + aggregate) / water. It is believed that this is due to an increase.

In addition, as a result of the compressive strength test of the subbase material using the coarse aggregate of another example of the present invention, it was evaluated that the compressive strength increased as W/B decreased.

In addition, a splitting tensile strength test according to curing time was conducted by mixing an accelerator into the subbase material using coarse aggregate of another example of the present invention.

As a result, it was found that the curing time was rapidly shortened as the amount of accelerator increased, and the splitting tensile strength was measured to be up to 0.82 MPa 3 hours after mixing the accelerator.

As a result of the above test, the fluidity and compressive strength of the subbase material using recycled fine aggregate and coarse aggregate of the embodiment of the present invention satisfied the relevant standards and standards.

The preferred subbase material of the present invention is relatively easy to supply and has a W/B of 212% to ensure sufficient initial strength when laying surface asphalt, and is a subbase material of the embodiment using coarse aggregate.

Next, the configuration of a mixing device (Mixer) for mixing the backfill material or subbase material of the embodiment of the present invention as described above will be described.

Referring to Figure 1, the mixing device 1 of the backfill or subbase material of the embodiment of the present invention is a mixing device capable of mixing at the road excavation and restoration construction site and moving to the site, and is a mixing device of the present invention as described above. A mixer (10) for mixing the ingredients constituting the filler or sub-base material, a water sprayer (20) for injecting water into the mixer (10), and the operation of the mixer (10) and the water sprayer (20). It is composed of a control panel 30 for controlling, a loading and unloading structure 40 combining the mixer 10, the water sprayer 20, and the control panel 30 to a frame 41.

The mixer 10 includes a hydraulic tank 11, a hydraulic pump 12, and a hydraulic cylinder 13 that operates an impeller (not shown) installed in the mixer 10 by hydraulic pressure supplied by the hydraulic pump 12. ) is provided, and the mixing speed can be adjusted by a control signal from the control panel 30.

The mixer 10 in the embodiment of the present invention was used with a capacity of 500 L, and a mixer with a hydraulic pressure of 100 to 200 bar was adopted.

The water sprayer 20 is preferably capable of adjusting the water content of the backfill material for smooth mixing of stone dust sludge, which is the main material of the backfill material. The water sprayer 20 of the embodiment of the present invention has a water content per minute that can control the water content. It is a high-pressure water sprayer of more than 10 liters.

In addition, the loading and unloading structure 40 was manufactured by combining a frame 41 made of steel into a hexahedral shape to facilitate loading and unloading on a vehicle such as a truck.

Meanwhile, the unexplained symbol 14 is a hydraulic control valve, 15 is an auxiliary engine, and 21 is a water tank.

Referring to Figure 2, a hopper device (hopper) for loading stone sludge, cement and aggregate used in the mixing device (1) for backfill or subbase material of the above-described embodiment of the present invention and moving to the site to supply the materials ( It represents 2).

The hopper device (2) is a hopper ( hopper (60), a hopper (70) for powder that accommodates powder such as cement, and a hopper (80) for aggregate.

In addition, a transfer device 90 is installed at the lower part of each hopper 60, 70, and 80 to input the received material and transfer it to the outside of the vehicle, and the material transferred through the transfer device 90 to the outside of the vehicle. It is configured to include an ejector 100 that discharges the liquid.

In addition, a control panel 110 is provided to control the operation of the hoppers 60, 70, and 80, the conveyor 90, and the ejector 100.

Preferably, each of the hoppers 60, 70, and 80 has a diamond or cone shape, and the conveyor 90 is installed with a screw or conveyor to transport materials therein, and each hopper It is desirable to be movably installed toward the lower discharge ports (61, 70, 80).

In addition, it is preferable that a mesh and a screen for filtering out impurities are installed at the top of the aggregate hopper 80.

In addition, a meter is installed in the hopper 60 for stone dust sludge, the hopper 70 for powder, and the hopper 80 for aggregate. Preferably, a load cell is used as the meter.

In addition, the discharger 100 is preferably equipped with a hydraulic automatic closing device, and the discharge pressure is appropriately set so that no residue of CLSM using stone dust sludge remains.

Next, the construction method for road excavation and restoration work using the above-described backfill and subbase materials will be explained.

Figure 3 is a cross-sectional schematic diagram of a road constructed using the backfill material and subbase material of the present invention, and Figure 4 is a flowchart of the construction method of the present invention.

Referring to the drawing, a cross-section of a road constructed using the backfill and subbase material of the present invention is formed by stacking backfill on the bottom surface of a cavity formed on the road to form a backfill layer (F1), The subbase material layer (F2) is formed by laminating the subbase material layer on the backfill layer (F1), and the asphalt material is stacked on the upper side of the subbase material layer (F2) to form the surface layer (F3).

Hereinafter, with reference to the flow chart of FIG. 4, the construction method of road excavation and restoration work using the backfill material and subbase material of the present invention will be described in a modified form.

1) Backfill layer formation step (S1)

Cement 9 to 23 is placed on the bottom of a cavity excavated on the road and shaped at a certain height.% by weight, 30-35% by weight of water, and 47-56% by weight of stone dust sludge are added to form a backfill layer (F1) at a certain height.

2) Subbase material layer formation step (S2)

A subbase material consisting of a mixture of 11 to 18% by weight of cement, 30 to 33% by weight of water, 48 to 50% by weight of stone dust sludge, and 4 to 10% by weight of recycled fine aggregate was added to the upper side of the backfill layer (F1) to maintain a constant height. A subbase material layer (F2) is formed.

In addition, optionally, a subbase material made by mixing 9 to 19% by weight of cement, 13 to 15% by weight of water, 41 to 45% by weight of stone dust sludge, and 27 to 31% by weight of coarse aggregate on the upper side of the backfill layer (F1). The subbase material layer (F2) can be formed at a certain height by adding .

Additionally, optionally, 14 to 21% by weight of cement, 10 to 13% by weight of water, 1 to 3% by weight of quick-setting material, 41 to 44% by weight of stone dust sludge, and 27-29% of coarse aggregate are added to the upper side of the backfill layer (F1). The subbase material layer (F2) can be formed at a certain height by adding subbase material mixed in % by weight.

3) Surface layer formation step (S3)

A surface layer (F3) made of asphalt material is formed on the upper side of the auxiliary base material layer (F2).

* Explanation of symbols for main parts of the drawing *
One; Mixing device of the present invention
2; Hopper device of the present invention
10; mixer
11; Hydraulic tank 12; hydraulic pump
13; hydraulic cylinder 14; Hydraulic control valve
15; auxiliary engine
20; water sprayer
21; water tank
30; panel
40; loading and unloading structures
41; frame
50; vehicle
51; Cargo loading space 52; frame structure
60; Hopper for stone dust sludge
70; Hopper for powder
80; Hopper for aggregate
90; transfer machine
100; discharger
110; panel

Claims (11)

delete delete delete delete delete delete delete delete In the construction method of road excavation and restoration work using backfill and subbase materials,
Backfill made of a mixture of 9 to 23% by weight of cement, 30 to 35% by weight of water, and 47 to 56% by weight of stone dust sludge is added to the bottom of a cavity excavated on the road and shaped to a certain height to maintain a constant height. A backfilling layer forming step (S1) to form a filling layer (F1);
Subbase material consisting of a mixture of 9 to 19% by weight of cement, 13 to 15% by weight of water, 41 to 45% by weight of stone sludge, and 27 to 31% by weight of coarse aggregate is added to the upper side of the backfill layer (F1) to maintain a constant height. A subbase material layer forming step (S2) of forming a subbase material layer (F2);
A surface layer forming step (S3) of forming a surface layer (F3) with asphalt material on the upper side of the auxiliary base material layer (F2); Including,
In the backfill layer forming step (S1), 9 to 23% by weight of cement, 30 to 35% by weight of water, and 47 to 56% by weight of stone dust sludge are mixed by a mixing device to produce the backfill,
In the subbase layer forming step (S2), 9 to 19% by weight of cement, 13 to 15% by weight of water, 41 to 45% by weight of stone sludge, and 27 to 31% by weight of coarse aggregate are mixed by the mixing device to form the subbase material. It is manufactured with
The mixing device includes a mixer (10),
A water sprayer (20) for injecting water into the mixer (10),
A control panel (30) that controls the operation of the mixer (10) and the water sprayer (20),
It is configured to include a loading and unloading structure (40) combining the mixer (10), water sprayer (20), and control panel (30) with the frame (41),
The loading and unloading structure 40 is manufactured by combining a frame 41 made of steel to facilitate loading and unloading from the vehicle,
In the backfill layer forming step (S1), the backfill material is introduced by the hopper device, and in the subbase layer forming step (S2), the subbase material is introduced by the hopper device,
A hopper (60) for stone dust sludge, a hopper (70) for powder, and a hopper (80) for aggregates respectively installed on the frame structure (52) fixed to the cargo loading space (51) of the vehicle (50);
A transfer device (90) installed at the lower part of each of the hoppers (60, 70, and 80) to load the received materials and transfer them to the outside of the vehicle;
a discharger (100) that discharges the material transferred through the conveyor (90) to the outside of the vehicle;
A construction method comprising a control panel (110) that controls the operation of the hoppers (60, 70, 80), the conveyor (90), and the ejector (100).
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