KR100719136B1 - Waste vinyl aggregate for reducing adfreezing force of building footing, method of producing the same and method of constructing the same - Google Patents

Abstract

The present invention provides a waste vinyl aggregate for reducing the cohesive force of the foundation of the structure manufactured to melt the waste vinyl material at a high temperature and then having a space therein, and to sort, insert, melt, draw, cool and It provides a method for producing waste vinyl aggregate for reducing the cohesion of the structure base comprising the step of cutting.

In addition, the present invention is to form a heat insulation layer by laying down in the form of covering the outer surface of the pile in the construction of the pile, especially in the ground where the active layer or permafrost layer repeats melting and freezing, for reducing the cohesion of the foundation of the structure Provided is a construction method of waste vinyl aggregate.

Bonding force, Pile, Waste vinyl, Space part, Insulation, Permafrost

Description

Waste vinyl aggregate for reducing adfreezing force of building footing, method of producing the same and method of constructing the same}

1 is a schematic view showing a manufacturing process of waste vinyl aggregate according to the present invention,

2 is a reference diagram showing a photograph of the manufactured vinyl aggregate,

3 is a comparative diagram showing the thermal conductivity of the waste vinyl aggregate according to the present invention,

4 is a reference diagram showing the annual surface temperature change and the temperature distribution according to the surface depth of the permafrost region,

Figure 5a is a state diagram showing the action force on the deep foundation pile in summer,

Figure 5b is a state diagram showing the action force on the deep foundation pile in autumn and winter,

Figure 6 is a detailed view showing the seasonal cohesion behavior,

7 is a cross-sectional view of the waste vinyl aggregate around the pile according to the present invention,

8A is a schematic diagram showing an experiment of reduction in adhesion force;

Figure 8b is a reference diagram showing the experimental state of the closed end steel pipe pile in Figure 8a,

9 is a reference diagram showing a photograph of the adhesive force reduction experiment,

10 is a comparison of the adhesive force reduction test according to whether or not the waste vinyl aggregate according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: waste vinyl aggregate 3: pile 5: space part

8: waste vinyl material 9: artificial lightweight aggregate 10: inlet

11 motor 12 reducer 15 feed screw

20: water tank 23: upper cover 24: load cell

25: means for measuring adhesion force 26: closed end steel pipe pile 28: earth

30: strain gauge

A: Temperature distribution at the bottom of summer ground B: Temperature distribution at the bottom of winter ground

The present invention is a heat-insulating construction aggregate having a space portion through melting a certain vinyl material and a specific processing step, an automated manufacturing method for recycling waste vinyl, which is a problem of environmental pollution in order to manufacture the same, The present invention relates to a construction method that increases the life of the pile and increases the stability of the structure by reducing the fixing force of the pile during the construction of the foundation pile using the same in the permafrost.

 In general, the forces acting on the foundation piles in permafrost areas such as polar regions are divided into frost-bonding forces acting on the circumferential surface of the pile, frost-bonding forces acting on the lowest surface of the pile, and vertical loading forces acting from the top of the piles. .

Here, the frost-free adhesion (adfreezing force, hereinafter referred to as 'adhesion') is a force acting on the pile active layer or permafrost layer where the elevation and settlement of the ground actively due to seasonal temperature changes, as shown in Figure 5a Say. And, the coercive force acting on the circumferential surface of which the surface area is larger than the lowest face of the pile is important because it affects the stability of the building structure and the pile even if the change is small.

This cohesion force increases the piles as the temperature of the active layer that melts with the temperature difference and the winter season when freezing occurs repeatedly increases the stakes, threatening the stability of ground structures and roads.

That is, in the contact portion of each soil layer elevation and settlement, the foundation piles are warped, cracked, and broken, and the life of the piles is reduced. In addition, there is a problem in that the cost of recovery due to the elevation and settlement of the ground is required, and the technology required for the construction of the foundation pile or the high physical characteristics of the pile itself is required.

On the other hand, waste vinyl materials are industrial wastes, and the amount generated with various waste plastics is enormous and due to excessive disposal costs, only part of them are landfilled or recycled, and most of them are left, causing soil pollution. In particular, the waste vinyl material to be buried does not rot permanently even when it is buried in the ground, there is a problem causing serious environmental pollution when incinerated.

Therefore, the present invention has been proposed to solve the above problems, to provide a heat-insulating waste vinyl aggregate having a low thermal conductivity through a predetermined step without melting a separate additive after melting the waste vinyl material, in order to manufacture it It provides an automated manufacturing method that recycles waste vinyl material, which is a problem of environmental pollution.In particular, it is used to reduce the cohesion of piles and increase the stability of structures and roads when constructing foundation piles using them in permanent ground with many temperature changes. The purpose is to provide a construction method that can reduce the cost of recovery.

In order to achieve the above object, the present invention provides a waste vinyl aggregate for reducing the cohesion force of the structure base manufactured to have a space therein through the cooling after melting the waste vinyl material at a high temperature.

The waste vinyl material is preferably polyethylene-based, and any one or more of soil, slag powder, sludge, coal material, waste concrete powder and waste tire pieces may be further mixed and melted in the waste vinyl material, and the melting temperature is 150 ° C. Preferably, the melted waste vinyl material may include a first solidification process in which the outside of the waste vinyl material is quenched and a second solidification process in which the inside is completely cooled by air. , The first solidification process is preferably made of a temperature range of 4 ℃ ~ 10 ℃ and a time zone of 10 seconds to 20 seconds by the coolant or cooling oil, the waste vinyl aggregate has the shape of any one of a circular, oval, polygonal appearance Characterized in that having, the waste vinyl aggregate preferably has a thermal conductivity of 0.01㎉ / m · h · ℃ or less, the waste vinyl aggregate has a maximum cross section Teeth can be made to 1㎝ ~ 3㎝.

In addition, the step of sorting and inputting the waste vinyl material, the step of melting the waste vinyl material to a predetermined temperature, the step of drawing the molten waste vinyl material into artificial lightweight aggregate of a predetermined shape, the artificial lightweight aggregate is a predetermined time at a predetermined temperature During the cooling step, the artificial lightweight aggregate cooled in the cooling step provides a method for producing waste vinyl aggregate for reducing the cohesion of the structure foundation comprising the step of cutting to a predetermined length.

Preferably, the melting step is performed at a temperature of 150 ° C. to 250 ° C., and the melting step includes mixing any one or more of soil, slag powder, sludge, coal ash, waste concrete powder, and waste tire pieces. It may include, the drawing step is preferably by a conveying screw, the cooling step is the first solidification process that the outside of the artificial lightweight aggregate is quenched and the secondary of the interior of the artificial lightweight aggregate is completely cooled by air It is preferable that a space portion is formed inside through a solidification process, and the first solidification process is preferably performed at a temperature range of 4 ° C. to 10 ° C. and a time period of 10 seconds to 20 seconds with cooling water or cooling oil.

In addition, there is provided a construction method of waste vinyl aggregate for reducing the cohesion force of the foundation of the structure to bury the waste vinyl aggregate prepared in the form surrounding the outer surface of the pile.

The ground in which the construction is made may be a polar region in which the active layer or the permafrost layer repeats melting and freezing, and the waste vinyl aggregate is preferably laminated in left and right directions and up and down directions around the pile.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Looking at the waste vinyl aggregate (1) and its manufacturing method for reducing the cohesion of the foundation of the structure according to the invention as follows.

1 is a schematic view showing a manufacturing process of the waste vinyl aggregate (1) according to the present invention, Figure 2 is a reference diagram showing a photograph of the produced waste vinyl aggregate (1).

In this embodiment, after performing the operation of sorting the collected waste vinyl material (8) as shown in Figure 1 and injecting the waste vinyl material (8) into the inlet 10, in a heating pipe of a predetermined length It is usually carried out by heating to 150 ℃ ~ 250 ℃ to melt in a gel (GEL) state without mixing additional additives. At this time, the waste vinyl material (8) is a waste vinyl material collected from a rural vinyl house, the component is PE, that is mainly composed of HDPE (High Density Poly Ethylene) and LDPE (Low Density Poly Ethylene).

Then, the waste vinyl material 8 in a gel form dissolved in the heating pipe is transferred to the screen on one side of the heating pipe. At this time, the conveyance of the molten waste vinyl material 8 is rotated by the motor 11, the speed reducer 12 and the speed reducer 12 on the opposite side of the conveying direction, and is positioned in the heating pipe 15. It is made in such a way that the artificial lightweight aggregate 9 is drawn by connecting and interlocking with the livestock. At this time, it is preferably drawn without being compressed. The exit of this exiting screen is equipped with a nozzle made according to the required shape, such as round, oval, triangular, square or hexagonal. In addition, the artificial lightweight aggregate 9 discharged through the nozzle is discharged to a size suitable for use as a heat insulating material.

Then, the discharged wire-like artificial lightweight aggregate 9 in the gel state is introduced into the water tank 20 in which water is contained, and a predetermined time, preferably 10 seconds ~ at a temperature of a predetermined temperature, preferably 4 ℃ ~ 10 ℃ It cools for 20 seconds and then solidifies. Then, the solidified artificial light aggregate (9) is cut into waste vinyl aggregate (1) which is a lump of a suitable length.

At this time, the reason for setting the temperature range is usually defined as the temperature range of the cooling water is usually 10 ℃ or less, when the cooling water is set to less than 4 ℃, the cooling water can be frozen, the reason for setting the time zone is 20 The space part 5 which solidifies to the inside of the aggregate 9 and satisfy | fills is not formed.

The waste vinyl aggregate (1) is subjected to stepwise cooling of the first solidification process of the surface and the internal second solidification process by air, which is preferably cooled for 10 seconds to 20 seconds at a temperature of 4 ° C to 10 ° C by cooling water. In the interior there is formed a space 5 including a large hollow and invisible multiple voids inside the aggregate, which is economically superior because it does not put a special blowing agent or other input agent.

In this case, the cooling water may be replaced or applied to a liquid or gaseous cooling medium such as cooling oil.

The produced waste vinyl aggregate (1) is preferably made to this value in order to improve the compaction degree for fine aggregates with a maximum cross-sectional length of 1cm ~ 3cm to facilitate mixing and bonding with viscous soils of the ground. However, it can be scaled to suit the intended purpose. For example, the maximum cross-sectional length of the gravel to prevent frostbite on the road is specified to be 75 mm or less, and the specifications of retaining wall fillers and concrete aggregates are specified in different sizes. In other words, it can be manufactured in a size suitable for the application as an alternative insulating aggregate of such construction aggregate.

In the manufacturing method of the present embodiment, only the waste vinyl material 8 in which the space part 5 is formed in the aggregate without dissolving the additives is mixed so that the production cost and the product cost are lower than those of the conventional method while mixing the additives. An example of the process is illustrated, but not limited thereto, and in order to increase physical properties such as strength, abrasion resistance, and durability, soil, slag powder, sludge, coal ash, waste concrete powder, waste tire flakes, etc. When melting 8) can be prepared by mixing in a predetermined ratio.

The thermal conductivity test of the waste vinyl aggregate (1) produced through such a process, the waste vinyl aggregate made by using waste vinyl material used in agriculture in the domestic and abandoned plastic house in the measuring box of size 25 × 25 × 10 cm ( 1) chopped. After that, a probe of the thermal conductivity tester was placed on the sample surface, and thermal conductivity was measured. In addition, to compare the thermal conductivity with general construction materials, the thermal conduction experiments were performed on sand, clay, gravel, and rock at the same time and the results were compared. The result is explained with reference to FIG.

Figure 3 is a comparative diagram showing the thermal conductivity of the waste vinyl aggregate (1) according to the present invention, the thermal conductivity of the produced waste vinyl aggregate (1) is mostly 0.01㎉ / m · h · ℃ or less, the thermal conductivity of general gravel 0.16㎉ It was about 1.7 times smaller than / m · h · ℃, about 3 times smaller than the thermal conductivity of sand, about 0.28㎉ / m · h · ℃, and about 14.1 less than 1.3㎉ / m · h · ℃, which is the thermal conductivity of clay. It appeared to be about twice as small and about 29 times smaller than the 2.7 ㎉ / m · h · ℃, which is the thermal conductivity of rock. As such, the waste vinyl aggregate 1 has been found to have excellent thermal insulation properties compared to other materials due to the space portion 5 including the large hollow and invisible pores inside the aggregate.

When installed in the permafrost layer using the waste vinyl aggregate (1), when the construction of the foundation pile (3) can achieve the effect of reducing the cohesion of the foundation of the structure, looking at the construction method of the waste vinyl aggregate (1) according to the present invention As follows.

As described above, the volume of ice in frozen ground in frozen ground becomes larger than that of water, so it is necessary to understand the temperature distribution of the ground and the response of the ground to the load during the construction of foundation piles in frozen ground. Understanding is important ahead of time.

4 is a reference diagram showing the annual surface temperature change and the temperature distribution according to the surface depth of the permafrost region, and shows a typical temperature configuration by the annual temperature change on the surface of the earth. As shown in Figure 4, the temperature distribution (B) of the lower part of the winter ground shows that the ground is completely frozen, while the temperature distribution (A) of the lower part of the summer ground is the image (+) at a certain depth Soil above this depth shows melting and these temperature graphs can be modified depending on the application.

The layers that repeat melting and freezing during the summer and winter seasons are called active layers and are indicated by dotted lines, and the thickness of the active layers is generally thickened in order of continuous, discontinuous and dotted. .

FIG. 5A is a state diagram showing the action force on the deep foundation pile 3 in summer, and FIG. 5B is a state diagram showing the action force on the deep foundation pile 3 in autumn and winter.

Figures 5a and 5b are divided into the summer and autumn and winter, respectively, the state of the force acting on the pile, respectively, the bonding force acting on the circumferential surface of the pile in the active layer and permafrost layer, the bonding force acting on the lowest surface of the pile And the vertical loading force acting from the top of the pile is indicated by the arrow, the summer active layer is melted and the excess water caused by this is eliminated by consolidation, so the ground subsidence occurs, the force is downward in the drawing In the autumn and winter, the active layer is frozen and acts upward in the drawing, and in the permafrost, the forces act in opposite directions, unlike the active layer.

Reducing the thickness of the active layer is a method of improving the temperature conditions of the foundation pile (3) to reduce the effects of ground uplift and settlement force to the pile (3), in particular during the construction of the pile (3) The heat of the ground is transferred into the ground, which increases the depth of the active layer locally. This is called Permafrost Degradation, which is further considered to confirm the stability of the ground and reflect it in construction. can do.

That is, the ground subsidence acts as a downward stress of the pile 3, which is similar to the subfrictional force, and in FIG. 6, which is a more detailed explanatory diagram of FIGS. Stability is confirmed. FIG. 6 is a detailed view showing seasonal cohesion behavior, and FIG. 7 is a cross-sectional view showing waste vinyl aggregate 1 around the pile 3 according to the present invention.

Q _L : Effective load (P) and pile weight (W) acting on the pile

Q _h : Design bearing capacity of frozen ground piles

Q _P : Same as in equation and occurs in layers l ₆ and l ₇

Q _t : principal friction in the melted ground

FS: Factor of Safety, which applies a safety factor of 3 in a typical design

A _n : Area of seasonal frozen ground

f _h : Bonding force caused by ground ridge

A _t : Area between the melted soil and the pile contact surface

As shown in FIG. 7, in order to reduce the rising blockage and mechanical stress of the pile 3 due to the fixing force, the fixing force when the pile 3 is installed in the active layer and the permafrost layer in which melting and freezing are repeated. The waste vinyl aggregate (1), which is a coarse non-homogeneous material instead of the existing soil, surrounds the outer surface of the pile (3) so that it does not occur around the soil (3). And laminated in the vertical direction. Such construction can be applied regardless of various existing construction methods.

In this way, the embedded vinyl aggregate (1) forms a heat insulation layer between the pile (3) and the ground to be sealed in the heat conduction surface. The verification experiment for this effect is as follows.

In order to demonstrate the effect of reducing the adhesion around the pile (3) of the waste vinyl aggregate (1), it is divided into a state in which only plain soil is contained and a waste vinyl aggregate (1) is put around the soil and the bonding force measuring means (25). The adhesion test was performed by the adhesion force measuring means 25.

FIG. 8A is a schematic view showing an experiment of reducing the bonding force, and FIG. 8B is a reference diagram showing an experimental state of the closed end steel pipe pile 26 in FIG. 8A.

FIG. 8a is an overall view for measuring the coercive force acting on the pile, the experimental apparatus is provided with a cylindrical earthenware 28 having a height of 1000mm and a maximum cross-sectional length of 900mm, the cohesive force measuring means 25 as in FIG. Closed steel pipe pile (26) made of steel pipe material of model 600mm in length, 40mm in length and 2mm in thickness, strain gauge (30), which is an input means for detecting the locking force for each pile position, and measuring the total fixing force The load cell 24 and the upper cover 23, which are recording means, were used to measure the fixing force.

9 is a reference diagram showing a photograph of the adhesive force reduction experiment.

As shown in Figs. 8A and 9, in the case of the model soil 28, the temperature distribution of the model ground was measured by embedding a temperature sensor for each depth, and thermal diffusion from the side and the bottom surface was performed to smoothly supply groundwater during the freezing of the model ground. In order to prevent and to describe a one-dimensional freezing system in which cold air is delivered only to the surface, experiments were performed after preventing the loss and blocking of cold air by covering a double 50mm thick sponge around the mold and the bottom surface. And, in order to describe the in-phase action in the model soil (28), the water in the cylinder in the water storage cylinder was introduced into the lower portion of the soil (28) naturally by the hydraulic inclination to describe the supply of ground water to the lower part of the ground. The experiment was carried out by attaching a temperature control device to prevent freezing of the incoming water.

10 is a comparison of the adhesive force reduction test according to whether or not the waste vinyl aggregate (1) according to the present invention.

Figure 10 shows the results of such a bond force test, the bond strength of the closed end steel pipe pile 26 without the waste vinyl aggregate (1) reached a maximum bond force of 0.60kg / ㎠ after about 80 hours, lung The bonding force of the closed end steel pipe pile 26 with the vinyl aggregate 1 reached a maximum bonding force of 0.21 kg / cm 2 after about 120 hours.

In this experiment, it was proved that when the waste vinyl aggregate (1) was used, there was about 65% reduction in adhesion force regardless of the construction method of the pile (3).

In the above, the present invention has been described with respect to the waste vinyl aggregate (1), the manufacturing method and construction method thereof for reducing the cohesion of the foundation of the structure by using the waste vinyl material (8) of the polyethylene-based polyethylene house in one embodiment In addition, the waste vinyl material 8 is OPP (opy) such as accessories packaging and biochemical packaging, nylon (HDP) such as herbal medicine packaging vinyl, HD (Hyden) such as hamburger packaging and dosage bags or polypropylene such as confectionery and food ( Polypropylene) waste vinyl materials are also available.

In addition, the present invention is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be apparent to those who have knowledge.

As described above, the present invention provides a waste vinyl aggregate for reducing the cohesion force of the foundation of the structure having low thermal conductivity by drawing the melted vinyl material after melting, and reduces the cohesion force of the foundation pile in the permafrost.

This prevents phenomena such as warping, cracking and breakage of the piles, prolonging their lifespan and mitigating the physical conditions required for the foundation piles, thereby lowering the technical level and cost of manufacturing the piles.

In addition, it is possible to reliably prevent the collapse of the structure or road to improve the stability, and to reduce the damage caused by the elevation and settlement of the ground.

Furthermore, by using the waste vinyl aggregate as an alternative to natural aggregate, it is environmentally friendly in terms of recycling resources while reducing environmental pollution.

Claims (20)

A waste vinyl aggregate for reducing the cohesion force of the foundation of the structure, which is manufactured to have a space including hollows and a plurality of micropores therein by performing stepwise cooling consisting of primary and secondary molten waste vinyl materials at a high temperature. The method of claim 1, The waste vinyl material, waste vinyl aggregate for reducing the cohesion of the foundation of the structure, characterized in that the polyethylene-based. The method of claim 1, Waste vinyl aggregate for reducing the cohesive force of the foundation, characterized in that any one or more of the soil, slag powder, sludge, coal ash, waste concrete powder, waste tire pieces are further mixed with the waste vinyl material. delete delete delete delete The method according to any one of claims 1 to 3, The waste vinyl aggregate, waste vinyl aggregate for reducing the cohesion of the foundation of the structure, characterized in that the outer shape has a shape of any one of circular, oval, polygon. The method of claim 1, The waste vinyl aggregate, waste vinyl aggregate for reducing the cohesive force of the base of the structure having a thermal conductivity of 0.01 ㎉ / m · h · ℃ or less. The method of claim 1, The waste vinyl aggregate, waste vinyl aggregate for reducing the cohesion of the foundation of the structure consisting of a maximum cross-sectional length of 1cm ~ 3cm. Sorting and adding waste vinyl material; Melting the waste vinyl material to a predetermined temperature; Drawing the molten waste vinyl material into artificial lightweight aggregate of a predetermined shape; Cooling the artificial light aggregate step by step through the first and second for a predetermined time at a predetermined temperature; And The artificial lightweight aggregate cooled in the cooling step is cut to a predetermined length Method for producing a waste vinyl aggregate for reducing the cohesion of the structure foundation comprising a. The method of claim 11, The melting step, a method for producing waste vinyl aggregate for reducing the cohesion of the foundation of the structure made of a temperature of 150 ℃ ~ 250 ℃. The method of claim 11, The melting step is a method for producing waste vinyl aggregate for reducing the cohesion of the foundation, including any one or more of the soil, slag powder, sludge, coal ash, waste concrete powder, waste tire pieces to the waste vinyl material is mixed. . The method of claim 11, The drawing step is a method for producing waste vinyl aggregate for reducing the cohesion of the foundation of the structure, characterized in that by the conveying screw. The method according to any one of claims 11 to 14, The cooling step is to reduce the cohesion of the foundation of the structure is formed in the space through the first solidification process that the outside of the artificial light aggregate is quenched and the second solidification process that the inside of the artificial light aggregate is completely cooled by air Method for producing waste vinyl aggregate. The method of claim 15, The first solidification process, the production method of waste vinyl aggregate for reducing the cohesion of the foundation of the structure made of a temperature of 4 ℃ ~ 10 ℃ by cooling water or cooling oil. The method of claim 16, The first solidification process, the manufacturing method of the waste vinyl aggregate for reducing the cohesion of the foundation of the structure made during the time period of 10 seconds to 20 seconds. The method of constructing the waste vinyl aggregate for reducing the cohesion force of the foundation, characterized in that the waste vinyl aggregate of claim 1 or the waste vinyl aggregate manufactured by claim 11 is buried in the form surrounding the outer surface of the pile. The method of claim 18, The ground is the construction is a construction method of waste vinyl aggregate for reducing the cohesion of the foundation of the structure, characterized in that the polar layer in which the active layer or permafrost layer is repeated melting and freezing. The method of claim 18 or 19, The waste vinyl aggregate is a construction method of the waste vinyl aggregate for reducing the cohesion force of the foundation of the structure to be laminated in the horizontal direction and the vertical direction around the pile.

Images