KR20040074383A - High-performance grouting system - Google Patents

Abstract

PURPOSE: A high-efficiency grouting system is provided to maximize the injection efficiency by improving the permeability of injection materials and to improve constructability by forming in a one-line loading system. CONSTITUTION: The high-efficiency grouting system comprises: a site grinder crushing thick injection materials placed to a site for grouting into ultrafine particles in a site; a high-speed shear mixer(320) breaking up ultrafine corpuscular cohesive powder by adding mechanical shear strength; a four-jaw stirrer(325) injecting suspension type injection materials supplied through the high-speed shear mixer or solution type injection materials supplied to a separate line selectively; a grout pump(330) pumping up the injection materials supplied through four-jaw stirrer at the appointed pressure; stand pipe fittings(340) injecting the injection materials supplied using the grout pump to the ground; and an automatic injection management system(350) controlling the pressure, quantity and speed of injection materials injected to the ground through the stand pipe fittings automatically within the preset range.

Description

High-performance grouting system

The present invention relates to a high-performance grouting system, in particular, to grind the fine particle in the field into ultra fine particles to improve the penetration of the injection material, to improve the injection properties by dispersing the cohesive powder of the ultra fine particles, a suspension using a four tank stirrer By selectively injecting type and solution type, it is possible to effectively cope with complex target soil, and to set the injection pressure, injection amount and injection speed in advance according to the ground condition and grouting purpose of the site, and the injection pressure of injection material within the set range. It is possible to maximize the injection effect by automatically adjusting the injection volume and injection speed, and it is related to a high performance grouting system that is easy to move and manage by mounting the components of the device in a batch line on a truck or a trailer.

In general, the grouting method is one of the method of ordering and solidifying among the soft ground improvement method. Since the ground improvement method by grouting has been settled by modern engineering review, there are hundreds of kinds of construction methods known at home and abroad. Technological development trends in this field can be divided into material development, construction method development and construction management technology development.

1 is a view showing an example of a conventional grouting system widely used in the country.

Referring to FIG. 1, the conventional grouting system includes a mixer / stirrer 110 for mixing and stirring grouting material, a grout pump 120 for pumping an injection material supplied from the mixer / stirrer 110 to a predetermined pressure; It is composed of a device 130 for automatically recording the flow rate and pressure of the injection material pumped by the grout pump 120 is injected into the ground, where the device 130 for automatically recording the flow rate and pressure is a function of simply recording Only holds.

2 is a view showing an example of a conventional advanced national grouting system.

Referring to FIG. 2, the advanced national grouting system includes a grout mixer 210 for mixing grouting material, an agitator 220 for stirring the injection material mixed by the grout mixer 210, and a stirrer 220. A grout pump 230 for pumping the injection material to a predetermined pressure, a flow meter 260b and a pressure gauge 260c for automatically recording the flow rate and pressure of the injection material pumped from the grout pump 230, respectively, and bleeding the injection material It consists of stand pipe fittings 260 made up of a bleeder valve 260d for improving the compactness of the injection material by discharging the bleeding water out. Here, the stand pipe fittings 260 are connected to an injection pipe 260a as a means for injecting injection material into the ground. In FIG. 2, reference numeral 270 denotes a water meter for measuring the amount of water supplied to the grout mixer 210.

By the way, in the grouting by the conventional grouting systems as described above, there is a problem that it is difficult to obtain a sufficiently satisfactory injection effect by using a thick injection material that is put into the field for grouting as it is, low permeability. In addition, in order to cope with such problems, there is a problem in that the material cost is increased according to the occurrence of additional incidental cost as the granular injection material is crushed back to ultrafine particles in the factory and then transported to the site. In addition, since the injection pressure and the injection amount of the injection material are simply recorded several times, and are processed in a post-management manner, there is a disadvantage in that the construction management of the injection material cannot be performed in real time. In addition, since only one of the suspension type and the solution type is used in the use of the injection material without considering the ground conditions, there is a limit in improving the injection effect.

The present invention was created in view of the above-mentioned problems in the conventional grouting system, and improves the permeability of the injection material by pulverizing the coarse injection material injected for grouting into ultra-fine particles in the field by the introduction of an on-site atomization pulverization device. The purpose is to provide a high performance grouting system.

Another object of the present invention is to provide a high-performance grouting system that can improve the implantability by dispersing the ultrafine particles of agglomerate powder by the introduction of a high speed shear mixer.

Still another object of the present invention is to provide a high performance grouting system capable of maximizing the injection effect by selectively using a suspension type and a solution type in accordance with the characteristics of complex target grounds by introducing a four tank type stirrer.

Another object of the present invention is to set the injection pressure, injection amount and injection rate in advance to suit the site conditions and grouting purpose of the site by the introduction of an automatic injection management system, and to automatically adjust such elements within the set range By providing a high performance grouting system that can maximize the injection effect.

Still another object of the present invention is to provide a high performance grouting system that can be easily moved and managed by mounting the above-mentioned injection apparatuses in a truck or trailer in a batch line, thereby improving workability.

1 is a view showing an example of a conventional grouting system widely used in the country.

Figure 2 shows an example of a conventional advanced national grouting system.

Figure 3 shows the configuration of a high performance grouting system according to the present invention.

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

110 ... mixing / stirrer 120,230,330 ... grout pump

130,240 ... Flowmeter 140,250 ... Hydraulic

210 ... Grout Mixer 220 ... Agitator

310 ... on-site granulation crusher 320 ... high speed shear mixer

325 ... Four-type stirrer 260,340 ... Stand pipe fittings

350 ... automatic injection management system

In order to achieve the above object, the high performance grouting system according to the present invention is a grouting system used to order and reinforce the ground by injecting a specific injection material into the ground or to improve it for a specific purpose.

An on-site fine particle pulverizing apparatus for crushing the coarse particle injected into the field for grouting into ultra-fine particles in the field;

A high speed shear mixer for dispersing agglomerated powders of the ultrafine particles pulverized by the field granulation pulverizer by applying a mechanical shearing force;

A four tank stirrer for selectively injecting a suspension-type injection material supplied through the high-speed shear mixer or a solution-type injection material supplied in a separate line;

A grout pump for pumping the injection material supplied through the four tank stirrer to a predetermined pressure;

Stand pipe fittings for injecting the injection material pumped by the grout pump to the ground; And

It is characterized in that it comprises an automatic injection management system that automatically adjusts the injection pressure, injection amount and injection speed of the injection material injected into the ground through the stand pipe fittings within a predetermined range.

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

3 is a view showing the configuration of a high performance grouting system according to the present invention.

Referring to FIG. 3, the high-performance grouting system according to the present invention is an in-situ grinder 310, a high speed shear mixer 320, a four-stirrer stirrer 325, a grout pump 330, and stand pipe fittings 340. And an automatic infusion management system 350.

The on-site granulation crusher 310 grinds the injection material having a large particle size injected into the field for grouting into ultra-fine particles in the field. Such in situ pulverization apparatus 310 is pulverized by inducing mutual collision between particles by using a grinding media such as steel balls, ceramic balls, and ultra-high speed centrifugal force vortex. By such a grinding mechanism, the grinding property can be improved.

In general, the injection material is selected according to the pore size and permeability of the soil to be injected and the purpose of the injection. In the case of large pores of the soil to be injected and a large amount of permeate, an injection material having a large particle size is used as in the case of ordinary cement. However, when the pore is small, the permeability is small and the improvement target is strictly set, it is advantageous to use the ultra fine particle injection material. However, when the ultra-fine particle injection material is manufactured in the factory, the unit price is greatly increased, and thus many restrictions are placed on the field application. Therefore, in the present invention, by using the in-situ granulation apparatus 310 as described above, the injection material of coarse particles is directly ground to make ultra-fine particles. For example, by injecting cement, slag, fly ash, bentonite, clay, etc., which are widely used as an injection material, the powder is also atomized to 6,000 cm 2 / g or more in the field.

On the other hand, by rotating the field micronized pulverizer 310 as described above at a high speed of 500rpm or more to form an ultra-high speed centrifugal vortex to measure the grinding performance for cement, slag, fly ash is shown in Table 1 below.

Time w / c 5 minutes 10 minutes 15 minutes Production rate (kg / hr) Ordinary cement 100 6140 6920 7980 1800 200 7130 7530 8190 1100 Slag 100 6980 7790 8340 1900 200 7540 8060 8410 1200 Fly ash 100 6690 7350 8690 1800 200 7130 7960 8440 1100

The high-speed shear mixer 320 disperses the superfine particles of the ultrafine particles pulverized by the in situ pulverization apparatus 310 by applying mechanical shear force. The high speed shear mixer 320 has a variable rotation speed (rotation per minute) of the rotor in the range of 0 to 1800 rpm.

The particle size distributions of cement, bentonite and clay which are most commonly used in suspension type injection materials are widely distributed from 1 μm or less to about 100 μm. In powder engineering, fine particles of less than 1㎛ are called agglomerates because they have the property that the particles try to aggregate themselves. Therefore, in the cement, bentonite, and clay, aggregated particles having a particle size of 1 µm or less are likely to be aggregated without being dispersed in the suspension unless they are forcibly separated by force. The method of dispersing the aggregated particles in this way is divided into two steps. The first step uses a high-speed shear mixer, as in the present invention, in a manner of forcibly separating the agglomerated particles by applying mechanical shear force. The second step may be used by adding a chemical admixture, such as a dispersing agent or a fluidizing agent, to the injection material in such a way as to use electrochemical repulsive force so that the separated particles do not aggregate again.

When the coagulant particles are agglomerated in the injection material and the coarse particles are more than 10 μm, the injection property is decreased, causing the blockage to be formed by lumping in one place without homogeneously filling the voids in the ground, thereby preventing the formation of a continuous order wall. Or, such a blockage phenomenon causes ground deformation such as elevation of ground as the injection pressure suddenly rises for a constant injection amount. As a result, positive pressure is applied to the foundation of adjacent structures, which may be the main cause of inclination and cracking. Therefore, by dispersing the agglomerate powder by using the high-speed shear mixer 320 as in the present invention, the injection effect is improved and the infiltration at low pressure is possible, thereby preventing ground deformation due to lateral flow.

The four tank stirrer 325 is a device for selectively injecting the suspension-type injection material supplied through the high-speed shear mixer 320 or the solution-type injection material supplied in a separate line, and is suitable for the injection work of the composite ground.

The grout pump 330 pumps the injection material supplied through the four tank stirrer 325 to a predetermined pressure.

The stand pipe fittings 340 inject the injection material pumped by the grout pump 330 into the ground. The stand pipe fittings 340 have an injection pipe 340a, which is a means for injecting injection material into the ground, a flow meter 340b for measuring the amount of injection material injected through the injection pipe 340a, and an injection pipe 340a. Pressure gauge 340c for measuring the pressure of the injection material injected through the) and the bleeding water inside the injection hole pushed toward the injection pipe 340a from the underground injection hole as the injection material is discharged to the outside It is basically provided with a bleeder valve (340d) for, and further includes a flow sensor (not shown) and a pressure sensor (not shown) that can monitor the flow rate and pressure, respectively.

The automatic injection management system 350 automatically adjusts an injection pressure, an injection amount, and an injection speed of an injection material injected into the ground through the stand pipe fittings 340 within a predetermined range. That is, the automatic injection management system 350 is electrically connected to the flow meter 340b and the pressure gauge 340c of the stand pipe fittings 340, respectively, using the automatic injection management system 350 such as an operator or a system. The operator sets the most suitable injection pressure, injection volume and injection speed in advance by considering the ground condition and injection purpose of the site. Then, the automatic injection management system 350 is to automatically adjust the injection pressure, injection amount and injection speed within the set range. Accordingly, the management of the injection material is automatically performed and the injection effect is further improved.

In addition, the automatic injection management system 350 as described above has a built-in correlation algorithm (a kind of software control program) of the pressure P, the flow rate Q, and the injection speed T, thereby ground characteristics of the injection work. Injection parameters are managed within a range of pre-designed pressures, flow rates and feed rates for overfilling purposes.

On the other hand, the above components, that is, the field atomization grinding device 310, high-speed shear mixer 320, four tank stirrer 325, grout pump 330, stand pipe fittings 340 and automatic injection The management system 350 is preferably configured as a mobile batch line mounting system which is mounted on a truck or trailer and is movable. As such, when the mobile batch line mounting system is mounted and moved on a truck or trailer, the mobility and manageability are improved, and the construction is further improved.

As described above, the high-performance grouting system according to the present invention is an on-site fine particle pulverizing apparatus for crushing the coarse particle injected for grouting into ultra fine particles in the field, and an agglomeration system of the ultra fine particles pulverized by the field fine particle pulverizing device A high-speed shear mixer for dispersing the powder by applying mechanical shear force, a four tank stirrer capable of selectively injecting suspension and solution injection materials, and a preset injection pressure, injection amount and injection speed of the injection material injected into the ground It is equipped with an automatic injection management system that automatically adjusts within a predetermined range, so that the penetration effect of injection material can be maximized, and the injection effect can be maximized. Can be moved to improve the workability. There is an advantage.

Claims (6)

In a grouting system used for injecting and reinforcing the soil by injecting a specific injection material into the ground or for improving it for a specific purpose, An on-site fine particle pulverizing apparatus for crushing the coarse particle injected into the field for grouting into ultra-fine particles in the field; A high speed shear mixer for dispersing agglomerated powders of the ultrafine particles pulverized by the field granulation pulverizer by applying a mechanical shearing force; A four tank stirrer for selectively injecting a suspension-type injection material supplied through the high-speed shear mixer or a solution-type injection material supplied in a separate line; A grout pump for pumping the injection material supplied through the four tank stirrer to a predetermined pressure; Stand pipe fittings for injecting the injection material pumped by the grout pump to the ground; And High performance grouting system comprising an automatic injection management system for automatically adjusting the injection pressure, injection amount and injection speed of the injection material injected into the ground through the stand pipe fittings within a predetermined range. The method of claim 1, The on-site granulation pulverizer is a high performance grouting system, characterized in that the grinding of the normal cement, slag, fly ash, bentonite and clay, etc. used as the injection material to a powder degree of 6,000 cm2 / g or more. The method of claim 1, Rotor speed of the rotor of the high speed shear mixer has a variable value in the range of 0 ~ 1800rpm. The method of claim 1, The stand pipe fittings are provided with a flow sensor and a pressure sensor for monitoring the flow rate and the pressure, respectively. The method of claim 1, The automatic injection management system incorporates a correlation algorithm (a kind of software control program) of pressure (P), flow rate (Q) and injection rate (T) to manage injection parameters within a predesigned pressure, flow rate and injection rate range. High performance grouting system, characterized in that. The method of claim 1, The field atomization crusher 310, high speed shear mixer 320, four tank stirrer 325, grout pump 330, stand pipe fittings 340 and automatic injection management system 350 to the truck or trailer High performance grouting system, characterized in that consisting of a mobile batch line mounting system that is mounted and movable.