KR101817576B1 - the mortar mixture with low fluidity using industrial by-product and the mortar grouting construction method with low fluidity using the same - Google Patents

Abstract

Provided is a low fluidity mortar mixture using industrial by-products, which can replace some of crushed stone or stone dust with industrial by-products such as bottom ash or blast furnace slag, and is composed of soil, crushed stone and stone dust, cement, mixing water, the industrial by-product, and an admixture which is composed of a fluidizer, a thickener, an antifoamer, metakaolin, fine silica, and a dehydration accelerator. Moreover, provided is a low fluidity mortar grouting method using the low fluidity mortar mixture which uses the industrial by-product, intended to grout the low fluidity mortar mixture using the industrial by-product in a specific position by sending the same by a pump.

Description

[0001] The present invention relates to a low-flow mortar mixture using industrial by-products and a low-flow mortar grouting method using the same,

    The present invention relates to a composite material composition for stable injection control by replacing part of crushed stone, which is the main material of compaction grouting using low-flow mortar (Low Slump Mortar), with industrial by-product such as bottom ash and blast furnace slag, And improving management methods.

If the crushed stones are replaced with bottom ash or blast furnace slag to produce a low-flow mortar with low slump, it may cause clogging of the pump due to material separation due to flow reduction. .

In the conventional case, in the process of pressurizing the low flow mortar including the bottom ash or the blast furnace slag, clogging occurs in the pipe due to the material separation, and the material separation phenomenon is considered as the reliability of the measurement result of the flow rate of the flow meter used in the injection management apparatus .

1 is a perspective view of a conventional mixer,

2 is a cross-sectional view taken along line A-A 'in Fig.

The low-flow mortar supplies material in the field by using a conveyor belt device like the feeder of FIG. 1 for the main materials such as soil and crushed stone. However, as shown in FIG. 2, due to the action of the conveyor belt, a compaction effect is generated around the discharge port to cause a blockage phenomenon in which the material is not discharged, or as the pressure acting on the conveyor belt increases in proportion to the amount of material accumulated on the upper portion The slip between the belt and the driving roller is increased, which causes difficulties in quantitative supply of the material.

Accordingly, the present inventors have developed a low flow mortar composition including a fluidizing agent, a thickener, a defoamer, a meta kaolin, a silica fine powder and a dehydration promoter to prevent pipe clogging due to material separation during pump feeding, The structure of the mixer is improved to prevent slipping of the conveyor belt.

[Patent Document 1] Korean Patent No. 10-0209247 'Construction Method of Underground Foundation Using Compaction Routing', August 29, 1998 [Patent Document 2] Korean Patent No. 10-0112479 entitled 'Fast-type mortar composition for compaction grouting method using bottom ash as aggregate', October 07, 2015

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the related art. In the case of supply of material using feed device equipped with conveyor belt and composition of mixture to prevent pipe clogging due to material separation during pump feeding of low flow mortar using industrial byproducts such as bottom ash and blast furnace slag, And to provide a conveyor belt overhead structure for preventing quantitative clogging of the conveyor belt and slip of the conveyor belt to maintain a quantitative supply of the material.

In order to solve the above-mentioned technical problem, the present invention replaces a part of crushed stone or a quartz with industrial by-products such as bottom ash or blast furnace slag,

In order to ensure the pumpability of a pump when replacing crushed stone, which is a main material of conventional low flow mortar, with industrial byproducts such as bottom ash and blast furnace slag, cement; Number of ingredients; Industrial byproducts; And a compatibilizer composed of a plasticizing agent, a thickening agent, a defoaming agent, a meta kaolin and a silica fine powder, and a dehydration promoting agent.

The present invention also provides a supply device structure for accurately injecting a constituent material on the basis of the mixing ratio of each constituent material.

According to the present invention, a low-flow mortar mixture capable of preventing pipe clogging when a low-flow mortar using industrial by-products such as bottom ash and blast furnace slag as an aggregate is pumped by a pump, a conveyor belt-based material The present invention provides a device structure for preventing the clogging of the discharge port and the slip of the conveyor belt generated in the supply device.

1 is a perspective view of a conventional mixer.
2 is a cross-sectional view of AA 'in FIG.
3 is an exploded perspective view of the mixer in the present invention.
FIG. 4 is a perspective view of FIG. 3. FIG.
5 is a cross-sectional view of BB 'in FIG.
6 is a photograph of a prototype of FIG.
7 is a photograph of the prototype of FIG.
8 is a cross-sectional view of CC 'in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In general, the compaction grouting method using a conventional low flow mortar is a method in which a concrete type injection material having a slump of 5 to 7 cm or less and having a low fluidity is pumped by a pump using soil, aggregate (crushed stone or stone), cement or water as a main material , Which is a reinforcement method to increase the soil density by compressing the surrounding ground with the strength of the bulb.

Conventional low-flow mortar is composed of soil, crushed stone (stone), cement and water, and 70-80% of the total weight is composed of 1: 1 mixture of soil and crushed stone. Device. In addition, low-flow mortar has many applications in the south-west coast region where the soft ground distribution ratio is high due to the geological characteristics of Korea. In these coastal areas, many industrial by-products such as blast furnace slag and bottom ash are generated in power plants and steelworks. The necessity of recycling is emerging.

In order to replace all or some of the crushed stones in the low-flow mortar with industrial byproducts, a blast furnace slag having a large particle size is required to be crushed to a size capable of being pumped by a pump. Burst ash is not used in many cases, In order to utilize industrial by-products such as bottom ash as a low-flow mortar material, there is a problem that piping clogging may occur due to a material separation phenomenon due to a decrease in flow during pump feeding.

Recently, in order to improve the quality control efficiency in the grouting method, the use of the automatic injection management system is increasing. Generally, the flow meter is used to record and manage the injection amount in the grouting, and the closer the grouting material is to the liquid, the higher the accuracy.

In the compaction grouting method using a conventional low flow mortar, an injection management system is tried to be introduced. However, since the air amount of the material is high using the soil and the stone, and the material is heterogeneous compared to the other method, Since many errors are generated, it is difficult to secure the reliability of the injection management.

Also, in the method of supplying the material using the conveyor belt, the pressure applied to the belt is increased according to the amount of the material to be fed into the feeding device, and the slip generated between the conveyor belt and the driving roller by this pressure increases, It is difficult to keep the conveyor belt at a constant speed, thereby causing a problem in keeping the supply of the material constant.

The low-flow mortar mixture, utilizing the industrial by-products of the present invention,

By replacing crushed stone or a portion of the stone with industrial by-products such as bottom ash or blast furnace slag,

Tosa;

Crushed stone and stone;

cement;

Number of ingredients;

Industrial byproducts;

An admixture composed of a fluidizing agent, a thickener, an antifoaming agent, a meta kaolin and a silica fine powder, and a dehydration accelerator;

And a control unit.

It is assumed that the aggregate is replaced with industrial byproducts for the amount of use of crushed stones or abrasive grains, and the mixing ratio of the soil and aggregate is 1: 1 by weight in the conventional technique, ) In consideration of the characteristics of large industrial byproducts, the mixing ratio of the soil and the mixed aggregate is 1: 1 based on the volume ratio, and the industrial by-product is a low-flow mortar mixture Of the total volume of the container.

The soil and cement mixture is 100 to 360 kg per 1 volume of low-flow mortar mixture (1 m 3) using the industrial by-products,

The water cement ratio (W / C) is 150% or less,

Wherein the industrial by-product has a maximum particle diameter of 10 mm or less, which is 50% or less of the total volume of the low-flow mortar mixture utilizing the industrial by-

The admixture is 0.1 to 5 parts by weight,

Based on the total weight of the admixture,

The fluidizing agent is 0.1 to 30 parts by weight,

The thickener is 0.1 to 30 parts by weight,

The antifoaming agent is 1 to 10 parts by weight,

The mixture of the meta kaolin and the silica fine powder is 30 to 50 parts by weight,

And the dehydration accelerator is 5 to 20 parts by weight.

In addition,

The present invention relates to a method for further adding a fluidizing agent, a thickening agent, a defoaming agent, a meta kaolin, a silica fine powder and a dehydration promoting agent in a basic formulation such as soil, aggregate, cement, water and the like in order to improve the injection efficiency and strength development during pump injection of a low- Respectively.

The above-mentioned gypsum refers to high-quality gypsum that can be used for construction purposes.

Portland cement is mainly used for the cement, and 100 to 360 kg per unit volume (1 m 3) is used depending on the required strength of the grout. In addition, minimum mixing is recommended so that the slump of the material becomes 5cm or less. The amount of water used should be 150% or less based on the water cement ratio (W / C).

In the existing low flow mortar method, the aggregate is used to increase the strength of the material during grouting and to smooth the conveyance by the bearing effect during pump feeding. However, in the present invention, part or all of crushed stone is replaced with industrial by-products such as blast furnace slag and bottom ash, and the maximum particle size is 10 mm or less, and the amount of industrial by-products is not to exceed 50% of the total volume including the soil and aggregate .

As a means for solving the difficulty in measuring the amount of injection due to irregular pressure change in the pipe clogging due to material separation and measuring the flow rate, the low flow mortar composition includes the following admixture (admixture), and the range of 0.1 to 5% .

The fluidizing agent is used in a range of 10 to 30% of the weight of the admixture, and the pumping performance is improved so that the mortar mixture can be smoothly transferred through the pipe or high-pressure hose, and the unit water (W / C) It is used for the purpose of promotion.

The thickener is used in a range of 5 to 25% by weight of the admixture, and is used to prevent the material separation phenomenon of low-flow mortar containing industrial by-products.

The antifoaming agent is used in a range of 1 to 10% of the weight of the admixture, and is used to prevent strength deterioration due to bubbling when the thickener is used.

The meta kaolin and silica fine powder are used in a range of 30 to 50% of the weight of the admixture, and meta kaolin makes the grout body hardened by the pozzolan effect dense, and the silica fine powder, which is the main component, It can be expected to improve strength and durability when both materials are used.

The dehydration accelerator used as a dispersant is used in a range of 5 to 20% of the weight of the admixture. By reducing the thickness of the double layer and promoting drainage through the osmotic phenomenon by increasing the ion concentration of the pore water, Thereby contributing to the strength enhancement.

3 is an exploded perspective view of the mixer in the present invention,

FIG. 4 is a perspective view of FIG. 3. FIG.

And FIG. 5 is a cross-sectional view taken along line B-B 'in FIG.

6 is a photograph of the prototype of FIG. 3,

FIG. 7 is a photograph of the prototype of FIG. 4,

8 is a cross-sectional view taken along line CC 'in FIG.

The construction of the compaction grouting method using the conventional low flow mortar can be classified into a continuous mixer for the production of mortar, a pump for the transfer and injection of the mortar, and a perforation and injection equipment.

In the case of a continuous mixer, a hopper for conveying soil and crushed stone to a conveyor belt, a screw-type loading box for conveying a binder such as cement, a water supply device, and a continuous mixer in the form of a screw auger for continuously mixing the input materials Respectively.

The gypsum and crushed stone mixture (M) corresponding to the total weight portions 70 to 80 generally comprises the lower conveyor belt 100; (320) having a slope so that the mixture can be collected by the conveyor belt by natural force by putting the mixture on the conveyor belt, and the height of the conveyor belt moving direction stacker And is transported using a supply device having a discharge port 330 with a door.

Conventionally, however, when a certain amount of material is fed into the feeding device, the vertical load generated on the conveyor belt due to the weight of the material exceeds the rotational force of the driving means located at both ends of the conveyor belt, Slip phenomenon occurs, thereby causing a problem that the material transfer becomes impossible. In addition, since the moving speed of the conveyor belt changes due to the increase in the load applied to the conveyor belt depending on the amount of the charged material, it is difficult to supply quantitative materials, resulting in quality control problems.

Also, as shown in FIG. 2, the conveying process of the conveying belt for conveying the mixture in the direction of the ejection port is transmitted to the mixture horizontally with the point of the loading wall located around the ejecting opening as a point, causing the compaction effect, The mixture acts as a force that hinders the passage of the mixture through the discharge port, thus causing a problem that a clogging phenomenon occurs in which the material is not discharged.

According to the present invention,

As a solution for reducing the load acting on the conveyor belt and for suppressing the compaction effect of the mixture which is the main cause of the clogging phenomenon at the discharge port, as shown in Figs. 3 to 5, A funnel-shaped load relief cone 300 having a wider cross section and a swash plate 310 at the upper part inside the discharge port just before the discharge port are applied.

The load relief cone 300 is located above the conveyor belt to prevent the material load, which is increased each time the mixture M is accumulated inside the load box 320, from being directly transmitted to the belt, An inverted V-shaped cross section formed symmetrically with respect to the center line is effective in order not to interfere with the supply, and in particular, the inclination of the cone so that the mixture smoothly slides along the surface of the cone 300 and moves to the conveyor belt, It is ideal to maintain a tilt greater than the angle of repose (?), Which is the inherent frictional resistance of the magnet (M).

In addition, the swash plate 310 located at the upper portion inside the discharge port immediately before the discharge port is applied as a protection means for preventing the horizontal force that causes the compaction effect of the mixture from being diffused to the surroundings in the process of conveying the mixture by the conveyor belt.

The present invention, as shown in Figures 3 to 5,

The mixture (M) of the gypsum and the crushed stone and the minerals,

A lower conveyor belt 100; A cone 300 having an injection port 310 and a discharge port 330 which are respectively opened at upper and lower parts and narrowed into a funnel shape at an upper part to a lower part; And a separator 500 installed inside the cone 300,

When the mixture M is introduced into the injection port 310 and is discharged to the discharge port 330 and is stacked on the conveyor belt 100 and transported,

The separator 500 separates the descending path of the mixture M and forms an empty space below the separator 500 to prevent the discharge port 330 from being blocked, Since the pressure applied to the belt 100 and the amount of the mixture M to be loaded on the conveyor belt 100 are constantly adjusted,

The mixture M is conveyed while being maintained at a constant rate through the conveyor belt 100 to be mixed with the cement, the compounding water, the industrial by-product, the fluidizing agent and the admixture.

Preferably, both ends of the separator 500 are detachably attached to the cradle 600 installed in the cone 300.

The separator 500 has an inverted V-shaped cross section in which the two separator plates 510 are formed symmetrically with respect to the center line by bending the steel plate,

The angle α between the separation plate 510 and the center line is set to maintain the angle of repose β at the lower end of the separation plate 510 when the mixture M is lowered by its own weight,

The angle? Is preferably 35 to 60 degrees.

As described above,

Conventional loaders (mixers) that transport soil and crushed stone to a conveyor belt have a problem in that the pressure applied to the conveyor belt varies depending on the amount of material loaded in the loader, thereby changing the moving speed of the conveyor belt or slipping between the conveyor belt and the roller It is difficult to quantitatively inject the material.

Accordingly, in order to smoothly insert the material and minimize the pressure increase on the conveyor belt, the separator 500 is installed on the upper part of the conveyor to prevent the increase in the pressure of the conveyor belt due to the introduced material. Type separator 500 is installed and it should be determined in consideration of the angle of repose () formed when the material is accumulated and the height of the discharge port.

Specifically, it is effective to form an inclination of 35 to 60 degrees inward with respect to the vertical plane as the optimum inclination? Of the separator 500.

If the distance is less than 35 degrees, inclination of the separator 500 is gentle and material input is delayed. If the distance exceeds 60 degrees, the internal space increases and the capacity of the mixer 100 is reduced.

The distance between the inclined surface of the cone 300 and the separator 500 is equal to the amount calculated when the material is charged when the height of the central portion formed by forming the angle of repose angle β from the outer gap is higher than the height of the discharge port 330.

Unlike the conventional FIG. 2, in FIG. 5,

The mixer 1000 as a supply device of the present invention forms a space in the discharge port 330 by vertically forming a wall at the lower end of the cone 300,

And a forward discharge port 322 is formed in an outlet direction along the moving direction of the conveyor belt 100.

The front discharge opening 322 is provided with a front discharge opening 320 functioning as a vertical opening / closing function to control the amount of mixture discharged to the front discharge opening 322.

Further, in FIG. 5, the lower end of the front discharge door 320 is required to maintain a minimum height D from the start position of the angle of repose .beta., So that the mixture is more mixed and prevented from clogging.

8,

A swash plate 400 having a predetermined inclination angle? May be provided on the front discharge port 322.

The height of the front discharge port 322 relative to the height of the mixture M traveling on the conveyor belt 100 is low so that there is no gap between the wall and the mixture when the slant plate 400 is absent And thus the clogging phenomenon in which the mixture is not discharged can occur in the past.

In the present invention, the position of the swash plate 400 is determined in consideration of the height of the discharge port 322 and the angle of repose of the mixture, whereby the mixture M is guided to the upper portion of the swash plate 400 without being accumulated on the discharge port 322, (322) upper wall and the mixture (M).

The present invention improves the injection amount measurement method as follows.

In order to increase the efficiency of the pump, it is necessary to gradually reduce the pipe diameter from the piston cylinder and the discharge port and to use 1 ~ 3 Reducer Cone in the middle.

The air flow rate of the mixed low flow mortar material is measured to be 4 to 10% or more (the amount of air that can be measured by the air flow rate tester is within 10%). Thus, the method of measuring the internal pressure has a poor pressure measurement efficiency. The inflation pressure acting on the inside of the tube during pressure feeding was measured using the Reducer cone as an orifice, and the injection amount was measured using the pressure difference generated between the two points.

The effects of the present invention are summarized as follows.

① Material supply efficiency and economy

By using industrial by-products such as blast furnace slag and bottom ash distributed in coastal areas where compaction grouting method using low flow mortar is mainly used, the efficiency of supply and demand of material is high, and unlike crushed stone aggregate purchased at a cost, It is economical.

 ② Improve quality control efficiency

The pumping performance can be stably maintained by preventing material separation from material separation.

By keeping the load acting on the conveyor belt at a constant level at a minimum level, the amount of material input using the conveyor belt is kept constant, improving the quality control of the low flow mortar.

  ③ Improvement of injection management efficiency

  Improvement of the injection management performance is achieved by improving the efficiency of the injection amount measurement results by utilizing the retouchahon as an orifice and improving the homogeneity of the material through the blending material mixture.

The low-flow mortar grouting method using the low-flow mortar mixture using the industrial by-product of the present invention refers to grouting the low-flow mortar mixture using the industrial by-product by pump-feeding and grouting at a predetermined position.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

It is therefore intended that the appended claims cover such modifications and variations as fall within the true scope of the invention.

M: Mixture of crushed stone and limestone
100: Conveyor belt
300: Cone
310: inlet
330:
500: separator
510: separator plate
1000: Mixer

Claims (6)

By replacing crushed stone or a portion of the stone with industrial by-products such as bottom ash or blast furnace slag,
Tosa;
Crushed stone and stone;
cement;
Number of ingredients;
Industrial byproducts;
An admixture comprising a fluidizing agent, a thickener, an antifoaming agent, a meta kaolin and a silica fine powder, and a dehydration accelerator;
And,
The soil and cement mixture is 100 to 360 kg per 1 volume of low-flow mortar mixture (1 m 3) using the industrial by-products,
The water cement ratio (W / C) is 150% or less,
Wherein the industrial by-product has a maximum particle diameter of 10 mm or less, which is 50% or less of the total volume of the low-flow mortar mixture utilizing the industrial by-
The admixture is 0.1 to 5 parts by weight,
Based on the total weight of the admixture,
The fluidizing agent is 10 to 30 parts by weight,
The thickener is 5 to 25 parts by weight,
The antifoaming agent is 1 to 10 parts by weight,
The mixture of the meta kaolin and the silica fine powder is 30 to 50 parts by weight,
Wherein the dehydration promoting agent is 5 to 20 parts by weight.
delete The method of claim 1,
The mixture (M) of the gypsum and the crushed stone and the minerals,
A lower conveyor belt 100; A cone 300 having an injection port 310 and a discharge port 330 which are respectively opened at upper and lower parts and narrowed into a funnel shape at an upper part to a lower part; And a separator 500 installed inside the cone 300,
When the mixture M is introduced into the injection port 310 and is discharged to the discharge port 330 and is stacked on the conveyor belt 100 and transported,
The separator 500 separates the descending path of the mixture M and forms an empty space below the separator 500 to prevent the discharge port 330 from being blocked, Since the pressure applied to the belt 100 and the amount of the mixture M to be loaded on the conveyor belt 100 are constantly adjusted,
The mixture M can be mixed with the cement, the compounding water, the industrial by-product, the fluidizing agent, and the admixture by being conveyed while being maintained at a constant rate through the conveyor belt 100 at a constant rate. Low - flow mortar mixture using by - products.
4. The method of claim 3,
The separator 500 has an inverted V-shaped cross section in which the two separator plates 510 are formed symmetrically with respect to the center line by bending the steel plate,
Wherein an angle alpha between the separation plate 510 and the center line is set to maintain the angle of repose beta at the lower end of the separation plate 510 when the mixture M is lowered by its own weight. Low - flow mortar mixture using by - products.
5. The method of claim 4,
Characterized in that said angle (?) Is between 35 and 60 degrees.
A low-flow mortar grouting method using a low-flow mortar mixture using industrial byproducts that grooves the low-flow mortar mixture using the industrial by-product of the present invention to a predetermined position by pumping.

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