KR101421173B1 - Drill Stirrer for the Hard Soil Layers - Google Patents

Abstract

The present invention relates to a drill stirrer connected to a lower end of a stirring rotary shaft of an auger apparatus to excavate and stir the ground when a deep cement mixing (DCM) method is applied. The drill stirrer for improving hard soil includes a rod connection part mounted at the lower end of a stirring rotary shaft of an auger apparatus; a main body post extended to the lower end of the rod connection part to be rotated; multiple auxiliary stirring wings rotating with the main body post, while being connected to a middle portion of the main body post by being spaced apart at predetermined intervals, and stirring slurry injected into an underground drilling hole together with soil of a natural ground; and a drill stirring part rotating with the main body post while being connected to the end of the main body post at the lower part of the auxiliary stirring wings, spraying high-pressure water or high-pressure air when digging through the ground, and stirring slurry together with the natural ground soil when drawing, wherein the outer peripheral surface of the main body post, the surface of the stirring screw, and the surface of the main stirring wing are coated with ceramics to prevent a mud ball phenomenon in which stirred slurry and natural ground clay are matted, and resistance to intrusion and drawing is minimized.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a drilling rig,

[0001] The present invention relates to a perforated stirrer for improving ground in soft ground during construction work, and more particularly to a perforated stirrer coupled to a lower end of an agitating rotary shaft of an auger device for excavating and stirring ground, Or a mixture of them to increase the excavation force. Thus, the DCM (Deep Cement Mixing) method can be easily applied to the ground, and the ceramic coating on the surface can be applied to the mud ball the present invention relates to a perforated stirrer for hard ground improvement.

Generally speaking, soft ground refers to ground composed of soft soil, and soft soil refers to soil which is weak and hard to compress. Such as clay, loose sand, organic soil, and the like. In the case of soft soil, sudden sinking can occur when vibration such as earthquake or explosion is transmitted. These soft grounds are expected to have excessive settlement and lack of bearing capacity, and countermeasures are required.

The cementation method, which is one of the methods used for the improvement of the soil of soft ground and the construction of the vertical wall in civil engineering works, consists of (a) a method of adding and mixing a hardening material to a soil material, (b) a method of filling hard material in the gap of the soil material, (c) a solid solution is generated in the clay mineral by heating to bind the soil particles.

Here, (a) the method of adding and mixing the hardenable material to the soil particles is mainly performed by using lime, cement, and 'superfine' mainly composed of these materials. Typical examples include a shallow mixing method and a deep- Deep Mixing Method is used. A stabilizer or a multi-Auger machine or the like is used to perform the deep mixing process or deep mixing process.

A conventional multi-Auger machine attaches a perforated bit to a stirring rod and rotates a perforated bit to stir and excavate the soil while applying a solidifying agent to the existing soil and solidifying agent (slurry) Mixed.

However, in the conventional drilling bit shown in FIG. 1, excavation is performed only by its own weight and rotational force, and drilling force is drastically lowered in a hard ground of N value of 15 or more. Since the stirring bit surface is made of general steel material, The clay and the like are clogged to form a mud ball, thereby drastically increasing the penetration and drawing resistance and deteriorating the quality of the reformer.

When the actual ground depth is defined as N 0 ~ 15 according to the hardness, the conventional perforating machines reach the limit that can not penetrate the N value of 15 or more, and they are staying at the level of drilling up to the N value of about 15.

In addition, if the discharge port for discharging the solidifying agent is provided only at the bottom of the agitating bit and the deep mixing process is performed in the hard ground or the clay soil having high adhesive strength, the agitating bit is pulled to the upper part of the ground after the excavation, And the stirring bit is lowered while stirring. As a result, the air (construction period) increases.

When applying DCM (deep solidification process) method with existing drilled bits, it is fundamentally difficult to apply in the hard ground due to various weaknesses and deterioration of penetration speed.

In other words, in the conventional DCM method, it was difficult to construct due to the decrease of the penetration speed in the clay layer having a N value of 15 or more and in the compacted sand layer. In the clay and sandy soil having high adhesive strength, mixing of the ground and cement paste was not easy, (Mud ball) with the quality of construction and deterioration of the auger rotation force, resulting in poor construction speed and quality.

In general, the conventional piercing stirrers use a general type of blade bit and do not surface treatment of the agitating bit. Since the two-directional injection method is used, the drilling ability is limited and the mud ball phenomenon The penetration speed is inhibited and the excavation force is lowered.

In the case of the conventional perforated agitating bit shown in FIG. 1, a discharge port is provided only in the lower portion of the main body near the agitating screw. In the upward drawing process, agitation with the ground plate can not be properly performed when the solidifying agent is injected through the discharge port. It is necessary to perform the work of lowering the punch stirring bit again while injecting the solidifying agent after pulling up the punch stirring bit upward.

Therefore, the lowered perforated stirring bit must be raised again to the upper part, so that the working air is inevitably delayed.

On the other hand, as a technique relating to the excavation apparatus of the ground, Japanese Patent Application Laid-Open No. 10-1052548 (registered on July 22, 2011), registered patent No. 10-1069107 (registration date September 23, 2011) and registered utility model No. 20-0462768 Registration No. 10-1202359 (Registration date 2012.12.12), Registration No. 10-1230320 (Registration date 2013.01.31), Registration No. 10-1274671 (Registration date 2013.06.07), etc. Lt; / RTI >

Registration No. 10-1052548 (registered on July 22, 2011) Registration No. 10-1069107 (registered on September 23, 2011) Registration Utility Model No. 20-0462768 (Registration date: September 21, 2012) Registration No. 10-1202359 (Registration date November 12, 2012) Registration No. 10-1230320 (Registered on January 31, 2013) Registered Patent No. 10-1274671 (Registration date 2013.06.07)

The present invention for solving the above-mentioned problem is to solve the above-mentioned problems by providing a drilling method and a drilling method for drilling a drilling bit, which can increase the excavating force by jetting high pressure air (air) or water jet (high pressure water) And an object of the present invention is to provide an agitator.

Another object of the present invention is to provide a perforated stirrer capable of minimizing intrusion and pull-out resistance by minimizing a mud ball phenomenon in which clay or the like is entangled.

It is another object of the present invention to provide a perforated stirrer of a new structure capable of homogenous stirring at the bottom of the ground perforation at a predetermined draw-out upward.

In order to accomplish the above object, the present invention provides a perforated stirrer coupled to a lower end of an auger device for exciting and stirring ground, comprising: a rod engaging portion mounted at a lower end of an agitating rotary shaft of the auger device; A plurality of auxiliary agitating blades for agitating the slurry injected into the perforation hole in the ground together with the soil of the ground surface while being rotatable with the main body support and vertically spaced apart from each other at regular intervals in an intermediate region of the main body support, (High pressure water + high pressure air) in the high pressure water or high pressure together with the slurry during the pumping with respect to the ground, And a perforating agitator for uniformly agitating the slurry together with the ground layer soil at a predetermined withdrawal after completion of excavation, To the excavation and slurry injection for both a rigid perforated stirrer for ground improvement are configured to parallel features of the example.

The perforated agitator is coupled in a spiral shape at the end of the body strut and injects high pressure water or a mixture thereof (high pressure water + high pressure air) at the time of pivoting against the ground and simultaneously injects the slurry in the excavation process And a main agitating blade which is coupled to the piercing agitating body in a form opposed to the main body pillar of the piercing agitator and which extends outwardly to assist piercing of the piercing agitator in the ground and agitates the slurry, And a perforated stirrer for ground improvement.

Wherein the perforating agitating member includes a pair of agitating screws which are formed to be opposite to each other along the outer circumferential surface of the main body support and which are formed in a spiral manner and are mounted at regular intervals along the outer circumference of the agitating screw, And a plurality of excavating bits formed in an inverted triangle shape having a narrow width so as to easily perforate the ground, wherein the excavating bit is a drilling stirrer for hard soil improvement.

At the rear of the main agitating blades and the pair of agitating screws, jet nozzles for jetting a mixture of high pressure water or high pressure and a mixture thereof (high pressure water + high pressure air) are provided behind the excavation sites of the excavating bits, Which is a drilling stirrer for hard ground improvement, which leads to an increase in strength.

Wherein the upper supply pipe and the lower supply pipe have a double pipe structure from the rod coupling portion to the upper end of the main body support through the flange, wherein the upper supply pipe extends from the inside of the upper end of the rod- And the lower feed pipe is connected to the upper discharge port passing through the upper end peripheral surface of the main body support and serves as a channel for injecting the slurry into the perforation hole, And the lower end of the body support, which is located at the lower end of the main stirring vanes, from the inside to the lower end of the body support, Pressure air or high-pressure air or a mixture thereof (high-pressure water + high-pressure air) The present invention is a piercing stirrer for hard soil improvement, which serves as a supply path pipe for injecting slurry and injecting slurry into the piercing hole.

A smooth flow of the slurry to the slurry injection from the inside of the bottom of the main body support in which the lower discharge port is located to the inside of the periodontium through the main stirring vane and the agitating screw and the mixture of the high pressure water and the high pressure, The upper end and the lower end of the space are formed by uniform spraying along with the smooth flow of the slurry, and a high pressure water or a high pressure of the mixture (high pressure water + high pressure air) And is a perforated stirrer for hard ground improvement, which is formed as a round portion for inducing uniform injection along a smooth flow.

The high-pressure air supplied to the lower supply pipe is supplied from an air dust collector provided at the upper end or the end of the motor of the auger device located at the uppermost stage, and is provided with a perforated stirrer for reducing the load on the air pressure of the air pump, As an example.

A flange connecting the lower end of the main body support and the portion connecting the perforated agitator to the end of the main body support, the flange being connected to the upper end of the main support and the rod coupling portion, And is a perforated stirrer for hard ground improvement, which permits internal permitting and securing of a space in a space portion.

The surface of the main shaft, the surface of the agitating screw, and the surface of the main agitating blade are coated with a ceramic to prevent agglomerated mud-ball phenomenon of the slurry and the paper clay, and the ceramic coating is capable of curing at room temperature And a paste-type ceramic coating agent composed of an inorganic ceramic, an organic powder, and a two-component type (composed of a base and a hardener) synthesized from a polymer.

The main agitating blades and the auxiliary agitating blades may have a diameter larger than the diameter of the main body support so as to withstand the resistance pressure acting in the rotating direction when the slurry injected in the perforation hole and the soil of the base paper are agitated. And is a drilling stirrer for hard ground improvement, extending outwardly from reinforcing members which are joined in a form to wrap the surface of the main body support.

In the interior of the main body support, an upper feed pipe and a lower feed pipe having a double pipe structure are provided, and the feed pipe is provided at a position directly above the lower feed pipe, which is the lower end inside of the main body support corresponding to the lower end region of the auxiliary stirring vanes, The slurry is airtightly filled into the lowest floor portion of the perforation hole in the course of the pouring through the upper supply pipe extended to the upper supply pipe and the upper discharge port provided in the lower left- And a hard soil stirrer for hard soil improvement wherein the hard ground aggregation in the course of the excavation is dissociated by the high pressure water sprayed through the injection nozzle through the space through the lower discharge port communicated with the lower supply pipe.

As described above, the present invention can be used to help excavation of excavation bits by injection of high-pressure water or high-pressure air or a mixture thereof (high-pressure water + high-pressure air) through an injection nozzle provided behind the excavation of the excavation bit in the excavation of hard ground Accordingly, the excavation work of the hard ground can be performed smoothly.

The present invention also provides a method of preventing or minimizing the entangled mudball phenomenon of the agitated clay by subjecting the outer circumferential surface of the main body support, the surface of the agitating screw, the surface of the main agitating blade and the surface of the auxiliary agitating blade to ceramic coating, It is possible to maintain the smooth stirring and minimize the penetration and drawing resistance.

In addition, the present invention is characterized in that the lower discharge port is provided in the stirring screw corresponding to the end of the main body support, and the upper discharge port is provided in the upper part of the main body support so that homogeneous stirring is performed during upward drawing of the perforating agitator, Since the penetration speed of the piercing stirrer can be maintained constant during the excavation process, the slurry can be simultaneously injected during the excavation process. Therefore, the problem of delay in the slurry injection after the excavation proposed is solved. And the construction cost can be reduced during the construction period.

In addition, since the multi-directional spraying method is applied in a state where the surface of the excavating bit is treated with a special coating together with the use of a special excavating bit, It is expected that the excavation force and the penetration or drawing speed are improved and the quality of the construction is improved.

Figure 1 shows a conventional perforated stirring bit.
2 is an overall perspective view showing a perforated stirrer according to a specific embodiment of the present invention.
3 is a cross-sectional view showing an auger device for mounting a perforated stirrer according to an embodiment of the present invention.
4 is an overall sectional view showing an embodiment of the perforated stirrer of the present invention.
5 is a detailed perspective view of the perforating agitating portion formed in the perforating agitator shown in Fig. 2, viewed from the bottom.
6 is a view showing an operation of underground pumping of excavating bits mounted on the piercing stir part shown in Fig.
FIG. 7 is a flow chart showing a process of underground excavation using the perforated stirrer of the present invention.
FIG. 8 is a schematic diagram showing a graph of slurry injection according to the actual construction of an outer shell construction, which is an example of DCM construction using the perforated stirrer of the present invention.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the limits of scope of the invention, , And should be interpreted based on technical ideas throughout the specification of the present invention.

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

As shown in FIG. 2, a piercing stirrer is mounted on a lower end of an auger device to excite and stir ground. The piercing stirrer includes a rod coupling part 110, a main body support 120, And a perforated stirring portion (M).

The main body support 120 extends to the lower end of the rod coupling part 110 and is connected to the agitating rotary shaft 50 of the auger device, The auxiliary stirring vanes 170 are rotatable together with the main body support 120 while being spaced apart from each other in opposite directions at the main shaft support 120, And the perforated stirring portion M rotates together with the body support 120 while being coupled to the body support 120 at the lower portion of the auxiliary stirring vanes 170, When the slurry is injected together with the perforating operation, high-pressure water is sprayed and the slurry is agitated.

The perforated stirrer of the present invention may be mounted on auger device in two or four or multiple axes, and these axes may be selected and applied according to the topography and working conditions of the ground.

3, the auger device includes a motor 20, a gear box 40 equipped with gears provided at the lower end of the motor 20, And the agitating rotary shaft 50 provided at the lower end of the box 40. When the agitating rotary shaft 50 is two-shaft or four-shaft or multi-shaft, the perforating agitator corresponding thereto is also a two- Can be mounted.

That is, in the perforated stirrer of the present invention, as the rod coupling part 110 is mounted on the stirring rotary shaft 50 of the auger device, the perforating stirrer rotates together with the stirring rotary shaft 50 to perform a pivoting operation.

2, the perforated stirrer of the present invention can be supplied with air from the upper end of the motor 20 of the auger device located at the uppermost stage and the air dust collector 10 provided at the side of the motor 20 .

That is, the hoses 10a connected to the air dust collector 10 are connected to the valve 30, and the air is supplied to the perforating agitator mounted on the agitating rotary shaft 50. The reason why the air cleaner 10 is provided at the upper end of the motor 20 of the auger unit located at the uppermost position or the side of the motor 20 is to reduce the load on the air supply pressure of the air pump In order to prevent backflow of air which may be caused by the air flow.

Such an air pump (not shown) generally takes up the air in the direction of the auger device installed at a height of about 80 to 100 m in a state of being arranged on the ship. However, when the air is pulled up together with the slurry, The air flows backward in the direction of the air pump.

Accordingly, since the air dust collector 10 is installed in the auger device located at the uppermost stage so as to reduce the pressure load of the air pump while preventing the backflow phenomenon, the perforator agitator receives air from the air dust collector 10 positioned in the upward direction , It is possible to realize air injection smoothly in the earth while being supported by its own weight.

The constituent parts of the rod coupling part 110, the main body support 120, the auxiliary stirring blade 170 and the perforating stirring part M of the perforating agitator of the present invention are shown in FIGS. 4 and 5 Will now be described in more detail.

The rod engaging portion 110 is coupled to the lower end of the agitating rotary shaft 50 of the auger device and has an engaging end face corresponding to the engaging end face of the lower end of the agitating rotary shaft 50 of the auger device. (110) forms a polygonal outer circumferential surface and is inserted into the lower end of the agitating rotary shaft (50) of the auger device.

The main body support 120 extends downward from the lower end of the rod coupling part 110 and functions as a central support of the present invention. The main body support 120 may be integrally formed from the beginning, . ≪ / RTI >

When the main stirring vanes 170 are arranged in the middle region of the main body support 120, the auxiliary stirring vanes 170 extend outwardly from the main shaft 120 at positions mutually opposed to each other about the main shaft 120, And are spaced apart from each other in a downward direction of the main body support 120, and are installed in a plurality of positions.

In addition, the auxiliary stirring vanes 170 are formed in a rhomboid shape to minimize the rotational load on the soil of the ground and the stirring of the slurry when the ground is pushed, and facilitate the cutting of the ground layer, thereby maximizing the stirring efficiency.

The perforation agitator M is disposed in the lower direction of the sub-agitating vanes 170, that is, in the lower main body support 120 of the sub-agitating vanes 170 by the flange F Lt; / RTI > Of course, the flange F may also be used to join the rod coupling part 110 to the main body support 120 extending in the upper direction of the auxiliary stirring vanes 170.

5, the perforating agitator M includes a perforating agitator 130 coupled to the end of the main body support 120, and an upper portion of the perforation agitator 130, And a main stirring blade 140 provided in the main body support 120 and positioned in the direction of the main stirring blade 120.

The perforating agitator 130 includes a pair of agitating screws 131 provided in a spiral shape and a plurality of excavating bits 133 mounted at regular intervals along the outer circumference of the agitating screw 131 .

The agitating screws 131 are formed in a spiral shape so as to face each other along the outer circumferential surface of the body support 120 at the end of the main body support 120, Are formed at regular intervals along the outer circumference of the screw 131, and are formed in inverted triangles in which the width becomes narrower toward the lower direction.

That is, when the hard ground is pierced, the perforation agitator 130 has a plurality of drilling bits 133 arranged in an inverted shape as a whole to facilitate the pouring operation, The high pressure water jetted from the nozzle 134 can maximize the efficiency of the pumping operation by helping the pumping operation from behind the excavation bit 133 as shown in FIG.

Of course, the high-pressure water jetted from the jet nozzle 134 can be used depending on the viscous conduction of the hard ground, and in the hard ground having relatively low viscosity, high pressure air can be applied instead of high pressure water , High-pressure water can be applied instead of high-pressure air in a hard ground having a relatively high viscosity. This is because the application of high pressure water can lower the viscosity of hard ground. These mixtures (high-pressure water + high-pressure air) may also be applied.

That is, high-pressure water or high-pressure air or a mixture thereof (high-pressure water + high-pressure air) is selected and applied according to the viscous conduction of the hard ground.

The main stirring blades 140 are positioned at the upper end of the stirring screw 131 and have a shape extending outward from the mutually opposed positions of the main body support 120 so that the soil and slurry in the perforation hole inside the perforation hole are stirred . Of course, since the main stirring vane 140 also has a rhombic shape similar to the auxiliary stirring vanes 170 described above, the rotational load caused in the stirring process can be minimized.

The stirring screw 131 is formed so as to surround the outer circumferential surface at the end of the main body support 120, and is formed as a pair facing each other. In addition, the stirring screw 131 serves to transfer the soil of the ground excavated in the excavation process to the upper part, and to stir soil or slurry in the perforation hole.

The excavation bit 133 is mounted at a predetermined interval in the form of a slope downward at the outer periphery of the agitating screw 131 and at both side ends of the main stirring vane 140.

The excavation bits 133 are pierced by the excavation bits 133. Since the excavation bits 133 are continuously worn during the excavation process, the excavation bits 133 can be installed in a detachable structure so as to be replaced at regular intervals.

That is, the excavation bits 133 can improve the difficulty of excavation of the hard ground due to the deflection of the bit due to the resistance of the ground sheet at the excavation drawing, which is a problem that can be caused by the existing blade-type .

In other words, the excavation bit 133 has an inverted triangular form in which the overall shape of the helical screw type combined with the excavation bits 133 decreases in the downward direction, thereby increasing the excavation force against the hard ground The high pressure water jetted from the injection nozzle 134 provided behind the agitating screw 131 is also effective in achieving the excavating force of the N value of 15 or more. Of course, not only the high pressure water but also the high pressure air and the mixture (high pressure water + high pressure air) may be explained.

That is, since the injection nozzle 134 is provided on the rear surface of the excavation bit 133, high pressure air (high pressure air) or high pressure water (water jet) or a high pressure air The mixture (high-pressure air + high-pressure water) is injected in various directions to increase the excavation force, enabling excavation at the N value 15 or more of the hard ground.

In other words, a plurality of excavation bits 133 mounted along the outer circumference of the spiral-shaped stirring screw 131 and a point that the overall shape of these excavation bits 133 are inverted triangular, Through a combined action mechanism of high pressure water (wattage jet) or high pressure air (high pressure air) injected from the provided injection nozzle 134 or a mixture thereof (high pressure water + high pressure air) It is possible to excavate hard ground of 15 or more.

2 and 3, the slurry, the high-pressure water, and the high-pressure air may be concurrently discharged in the upper side and the lower side around the main body support 120 as shown in FIG. 4, Are preferably discharged in the downward direction, and the slurry is preferably discharged in both the upward direction and the downward direction.

The discharge of the slurry is discharged from both the upper and lower sides in order to achieve uniform stirring with the discharge of the slurry at the predetermined drawing after penetration of the piercing stirrer into the ground in the DCM method.

That is, since the perforating agitator is stopped at the completion of the penetration of the perforating stirrer, it is possible to cause defects (agitator defective) in the agitation of the paper and the slurry, which can be solved and uniform agitation of the slurry . On the other hand, the high-pressure water and the high-pressure air have to help underground excavation of the excavation bit 133 discharged from the lower side.

4, the upper supply pipe 151 and the upper supply pipe 151 of the lower supply pipe 161 provided in the rod coupling part 110 are connected to the upper side of the auxiliary stirring vanes 170, The slurry is discharged through the upper discharge port 150 penetrating the surface of the column 120 and the lower supply pipe 161 extends to the inside of the main column 120 located below the auxiliary stirring vanes 170 The injection nozzles 134 provided in the main stirring vane 140 or the injection nozzles 134 provided in the agitation screw 131 located at the lower portion of the main stirring vane 140 through the space portion 132 in which the round portion 132a is formed, And discharges the slurry or injects high-pressure water or high-pressure air through the nozzles 134.

The upper discharge port 150 is provided on the upper outer circumferential surface of the main body support 120 to discharge the slurry and the lower discharge port 160 is formed of slurry, high pressure water (water jet), high pressure air (high pressure air) And the mixture (high-pressure water + high-pressure air) is discharged into the space portion 132 formed in the lower portion of the main body support 120 and the smooth flow in the space portion 132 is maintained, And is uniformly discharged in multiple directions through the spray nozzles 134 provided in the spray nozzles.

The lower supply pipe 161 is extended from the upper end of the rod coupling part 110 to the vicinity of the lower end of the main body support 120 in a direction parallel to the central axis thereof, ), High-pressure air (high-pressure air) or mixture (high-pressure water + high-pressure air), and a slurry supply line.

The upper supply pipe 151 is installed on the same axis as the lower supply pipe 161 and has a double pipe structure together with the lower supply pipe 161. The upper supply pipe 151 serves as a supply line for the slurry, .

The space portion 132 forms a round portion 132a in the vertical direction inside the main body support 120. The round portion 132a smoothly discharges the slurry and induces a uniform discharge of the slurry On the other hand, the flow of air to the high-pressure water and the flow of air to the high-pressure air are smoothly conducted, and the uniform injection of these high-pressure water and high-pressure air is induced.

The main stirring vane 140 and the auxiliary stirring vane 170 described above may cause bending deformation due to the resistance pressure acting in the rotating direction when the slurry injected into the perforation hole and the soil material of the ground sheet are stirred. A reinforcing member 171 having a width greater than the bore width of the main body support 120 may be further provided to surround the bore surface of the main body support 120 and the reinforcing members 171 The main stirring blades 140 and the auxiliary stirring blades 170 are extended outwardly.

A flange F connecting the upper end of the main body support 120 and the rod engaging portion 110 except for the intermediate region of the main body support 120 having the auxiliary stirring vanes 170 on the basis of the main body support 120, Which is provided at the lower end of the main body support 120 and at the end of the main body support 120, The flange F is adapted to allow smooth flow of the high-pressure water, high-pressure air, and slurry, and to secure space in the space portion formed for uniform injection and discharge.

The outer peripheral surface of the main body support 120, the surface of the stirring screw 131 and the surface of the main stirring vane 140 including the surface of the excavation bit 133 are coated with ceramics It is possible to prevent the agglomeration phenomenon (mud ball) between the agglomerated soil (clay) and the slurry, thereby reducing the penetration and drawing resistance of the perforated stirrer.

The ceramic coating can be selected from two-component (consisting of a topical and hardening agent) paste ceramic coating, which can be cured at room temperature, and is composed of an inorganic ceramic, an organic powder, and a polymer.

This ceramic coating can also be applied to the inner surfaces of the upper supply pipe 151 and the lower supply pipe 161. That is, when the inner surfaces of the upper supply pipe 151 and the lower supply pipe 161 are left for a long period of time, clogging of the inside of the pipe can be solved by adhesion of a solid lump of slurry due to internal surface corrosion.

When such a ceramic coating treatment is performed, clay and the like are prevented from clogging, thereby minimizing intrusion and drawing resistance. In other words, it is possible to reduce the penetration and drawing resistance by suppressing the mud ball phenomenon that particles of the modified ground, in which the solid mass of the slurry and the soil (clay) of the ground surface are agitated, attached to the surface of the perforation stirrer, The shape of the main stirring blades 140 can be maintained as it is and the smoothness of stirring can be maintained.

The above-mentioned slurry is a component of a solid object (a reformer, a slurry + a paper sheet) that supports a building after the ground penetration and is intended for solidification. Therefore, the slurry has a high water content and a large amount of organic matter These binders show the results of the following compressive strength tests in comparison with the control group in combination with water. It is preferable to use a geotone product for the fireproofing.

For the same application conditions of the experimental group and the control group, 400 cc of water was added to the sample soil before mixing the slurry in consideration of the characteristics of the hard clay, and the slurry was mixed with water and the ratio of A to B 0.8.

Compressive strength test result table - Control group A Substance (cement) Consumption (kg / m3) Design Criteria Strength (Mpa) Age 28 days strength (Mpa) 250 3.0 1.53 300 3.0 1.83

Compressive strength test result table - Experimental group B substance (high fire) usage (kg / m3) Design Criteria Strength (Mpa) Age 28 days strength (Mpa) 180 3.0 2.18 210 3.0 3.11

As a result of comparison between Table 1 and Table 2, it is found that the control group does not satisfy the design standard strength but the test group satisfies the design standard strength when 210 kg / m 3 is used in the test group.

9, the upper discharge port 150 communicating with the upper supply pipe 151 is provided near the lower discharge port 160 communicating with the lower supply pipe 161 as shown in FIG. 4 .

In other words, the upper supply pipe 151 extends from the middle region of the body support 120 having the auxiliary stirring vanes 170 to the lower direction, like the lower supply pipe 161, And the upper discharge port 150 may be configured to discharge the slurry in the left and right direction from the main body support 120 at a point directly above the lower discharge port 160. [

The reason why the present invention is modified as shown in FIG. 9 is that the upper feed pipe 151 is connected to the auxiliary stirring vane 170 (FIG. 4) when the rough cohesive force of the hard ground is difficult to solve with the perforated stirrer shown in FIG. And the upper discharge port 150 communicating with the extended upper supply pipe 151 is positioned at a position directly above the lower discharge port 160. The upper discharge port 150 communicates with the upper supply pipe 151, And the slurry is discharged in the left-right direction of the main body support 120 by being positioned in the main body support 120.

Therefore, the perforated stirrer of the present invention applied as shown in FIG. 9 can dissociate the agglomerated to harder agglomerated hard ground which can not dissociate with the perforated agitator shown in FIG.

More specifically, not only the lower discharge pipe 160 but also the upper discharge port 150 are located in the vicinity of the main stirring blades 140, and the slurry discharged through the upper discharge port 150 in the process of pivoting against the hard ground, High-pressure water or high-pressure water or high-pressure water which is injected through the space portion 132 and through the injection nozzle 134, and high-pressure water or high-pressure water, which is injected through the injection nozzle 134, through the lower discharge port 160, The cohesive force on the hard ground in the rolling process can be dissociated by the air.

When the cohesive force dissociation of the hard ground is difficult due to the perforated stirrer shown in FIG. 4, the cohesive force of the hard ground can be dissociated by the perforated stirrer constructed as shown in FIG. 9 as described above. That is, the slurry is discharged to the upper discharge port 150 through the upper supply pipe 151, thereby realizing the airtight filling of the slurry at the lowest floor portion of the perforation hole, and at the same time, As the jet nozzle 134 injects the high-pressure water, it can dissociate the hard ground which is agglomerated more strongly.

Hereinafter, the DCM construction method using the perforated stirrer of the present invention will be described. For the contents of the DCM construction method, reference is made to the drawings shown in FIG. 7 and FIG.

Move the perforated stirrer including the auger device to the target site where the perforation hole for ground improvement is to be excavated.

In the ground excavation step (S1)

Step S1 is a step of activating (rotating) the auger device so that the piercing stirrer vertically excavates the ground to reach the design depth. In this excavation process, the excavation bits 133 are rotated while rotating at the target of the drilling hole. At this time, the high pressure water or high pressure air passing through the space portion 132 through the lower discharge port 160, (Injected) in the advancing direction of the work to increase the excavation force. In this underground pumping process, the slurry is simultaneously injected into the perforation hole.

In the course of the hard ground drilling, the drilling stirrer assists the underwater drilling of the drilling bit 133 by injection of high-pressure water or high-pressure air through the injection nozzle 134, so that the drilling speed can be kept constant, Since slurry injection of the target amount is also possible, the slurry injection can be performed simultaneously during the pumping process.

That is, as shown in FIG. 8, excavation of a hard ground is carried out to a portion from (1) to (2), and the slurry is also injected simultaneously in this process.

A step S2 of confirming whether or not the stirrer is pulled out;

The step (S2) is a step of confirming whether or not a predetermined draw of the piercing stirrer is performed after completion of excavation. If the predetermined draw is not performed, the auger device is operated (rotated) A predetermined drawing step S2-1 of the stirrer for raising the perforation stirrer in the perforation hole by the height difference between the discharge port 160 and the upper discharge port 150 is performed.

Re-injecting the slurry and lowering the stirrer (S3)

The step S3 is a step of lowering the piercing stirrer to reach the bottom of the perforation hole while injecting the slurry into the bottom portion of the perforation hole and moving the slurry passing through the space portion 132 through the lower outlet port 160 to the agitating screw The slurry is re-injected at a predetermined height from the bottom of the perforation hole while discharging the slurry through the spray nozzles 134 provided in the main agitating blades 140 and 131. At this time, the auger device is operated (rotated) The re-descending is performed simultaneously. In this process, the slurry and the ground slurry are agitated by the main agitating blades 140 and the auxiliary agitating blades 170 of the perforating agitator.

That is, from step S2 to step S3, as shown in Fig. 8, the step from ③ to ④ is a step in which the slurry and the soil of the paper substrate are not evenly stirred due to the stationary state of the perforating stirrer after completion of the excavation in S1 The main agitator blades 140 and the auxiliary agitating blades 170 of the perforating agitator perform the role of further homogeneously stirring the slurry and the paper substrate so that the quality of the upgrading body can be further improved.

In the step S4 of raising the stirrer,

In the step (S4), the perforation stirrer is elevated up to the upper end of the perforation hole, and the slurry and the paper substrate are uniformly stirred.

That is, the auger device is operated (rotated) so that the perforated stirrer rises again. In this process, it corresponds to the area from ⑤ to ⑦ shown in FIG. 8 in which the slurry and the paper substrate are homogeneously stirred by the main stirring blades 140 and auxiliary stirring blades 170 of the punching mixer.

(S5) of confirming the amendments (object for supporting the building)

The step S5 is a step of checking the presence or absence of defects in the ameliorated object (object for supporting the building) solidified in the perforation hole at the end of the ascending of the perforated stirrer.

Step S6 of withdrawing water from the stirrer

The step (S6) is not limited to the water but can be interpreted including a general ground. The piercing stirrer including the auger device is pulled out to move the agitated ground.

The step of cleaning (S7)

The step (S7) is a step of cleansing the inner and outer portions of the perforated stirrer, which has been completed, to prevent malfunction or clogging due to solidification of the slurry.

In the DCM construction for the hard ground using the piercing stirrer of the present invention, since the V-shaped construction can be performed as a whole, it is possible to perform the two-stroke application of the slurry after the excavation Can be shortened by one stroke (parallel combination of excavation and slurry injection).

As described above, the present invention can simultaneously perform the slurry injection in the excavation process of the hard ground, and it is possible to shorten the construction period as a whole by solving the problem of the delay of the slurry injection after the excavation, The construction cost required for the construction can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It will be clear that the present invention falls under the protection scope of the present invention even in the case of addition or deletion of known technology,

10: Air dust collector 10a: Hose
20: motor 30: valve
40: gear box 50: stirring rotation shaft
110: rod coupling portion 120: main body support
F: Flange
M: Perforation agitation section
130: Perforating stirrer 131: Stirring screw
132: Space part 132a: Round part
133: excavation bit 134: injection nozzle
140: main stirring wing
150: upper discharge port 151: upper supply pipe
160: Lower discharge port 161: Lower discharge pipe
170: auxiliary stirring wing
171: reinforcing member

Claims (11)

A perforated stirrer coupled to a lower end of an auger device for exciting and stirring ground,
A rod engaging portion mounted at a lower end of a stirring rotary shaft of the auger device; A main body support extending to the lower end of the rod coupling portion and rotated; A plurality of auxiliary agitating blades which are vertically spaced apart from each other at regular intervals in the intermediate zone of the main body support and which rotate together with the main body support and stir the slurry injected into the perforation hole in the ground together with the soil of the base sheet; (High-pressure water + high-pressure air) is sprayed with high-pressure water or high-pressure water together with the slurry during the pumping with respect to the ground, A perforating agitator for agitating the slurry homogeneously with the ground substrate at a predetermined drawing time; And simultaneously excavation of the hard ground and slurry injection are simultaneously performed,
Wherein the body support has an upper feed pipe and a lower feed pipe having a double pipe structure, wherein the upper feed pipe is arranged side by side in the central axis direction from the upper inside of the rod engaging portion to the upper inside of the body post, The slurry is connected to the upper discharge port penetrating the upper peripheral surface of the column and serves as a channel for injecting the slurry into the perforation hole,
The lower supply pipe is provided on a concentric axis with the upper supply pipe from the upper end of the rod coupling portion to the lower end of the main body support corresponding to the lower end portion of the auxiliary stirring vanes, (High-pressure water + high-pressure air) in the multi-direction when the perforation hole is pushed, and serves as a conduit for injecting the slurry into the perforation hole ,
A smooth flow of the slurry to the slurry injection from the inside of the bottom of the main body support in which the lower discharge port is located to the inside of the main body support through the main stirring blades and the stirring screw and the high- Air) is formed in the space portion,
And the upper and lower surfaces of the space are formed as a round part for uniform spraying along with the smooth flow of the slurry and for guiding uniform spraying according to smooth flow of the mixture (high pressure water + high pressure air) at high pressure water or high pressure Perforated stirrer for hard soil improvement. The apparatus of claim 1, wherein the perforating agitator comprises:
A piercing stirrer coupled in a spiral shape at the end of the body strut to inject high pressure water or high pressure air or a mixture thereof (high pressure water + high pressure air) when piercing against the ground, and simultaneously injecting the slurry during excavation;
A main agitating blade coupled to the perforation main body of the perforating agitator in such a manner as to be opposed to the main body pillar of the perforating agitator and extending outwardly to assist the piercing of the perforation agitator and to agitate the slurry;
And a punching unit for punching the hard soil. [3] The apparatus of claim 2,
A pair of agitating screws provided to be opposite to each other along the outer circumferential surface of the main body support and spirally formed;
A plurality of excavating bits which are installed at regular intervals along the outer circumference of the stirring screw and are formed in inverted triangles of a shape having a narrower width in a downward direction,
And a punching unit for punching the hard soil. The method according to claim 2 or 3,
At the rear of the main agitating blades and the pair of agitating screws, jet nozzles for jetting a mixture of high pressure water or high pressure and a mixture thereof (high pressure water + high pressure air) are provided behind the excavation sites of the excavating bits, Wherein the pore diameter of the pore diameter of the pore diameter of the pore diameter of the pore diameter increases. delete delete A perforated stirrer coupled to a lower end of an auger device for exciting and stirring ground,
A rod engaging portion mounted at a lower end of a stirring rotary shaft of the auger device; A main body support extending to the lower end of the rod coupling portion and rotated; A plurality of auxiliary agitating blades which are vertically spaced apart from each other at regular intervals in the intermediate zone of the main body support and which rotate together with the main body support and stir the slurry injected into the perforation hole in the ground together with the soil of the base sheet; (High-pressure water + high-pressure air) is sprayed with high-pressure water or high-pressure water together with the slurry during the pumping with respect to the ground, A perforating agitator for agitating the slurry homogeneously with the ground substrate at a predetermined drawing time; And simultaneously excavation of the hard ground and slurry injection are simultaneously performed,
Wherein the body support has an upper feed pipe and a lower feed pipe having a double pipe structure, wherein the upper feed pipe is arranged side by side in the central axis direction from the upper inside of the rod engaging portion to the upper inside of the body post, The slurry is connected to the upper discharge port penetrating the upper peripheral surface of the column and serves as a channel for injecting the slurry into the perforation hole,
The lower supply pipe is provided on a concentric axis with the upper supply pipe from the upper end of the rod coupling portion to the lower end of the main body support corresponding to the lower end portion of the auxiliary stirring vanes, (High-pressure water + high-pressure air) in the multi-direction when the perforation hole is pushed, and serves as a conduit for injecting the slurry into the perforation hole ,
Wherein high pressure air supplied to the lower supply pipe is supplied from an air dust collector provided at an upper end or a side end of a motor of the auger device located at the uppermost stage to reduce the load on the air pressure of the air pump and prevent reverse flow of air. Perforated stirrer for ground improvement. The method according to claim 1,
A portion connecting the upper end of the main body strut to the rod engaging portion, and a portion connecting the lower end of the main body strut and the perforating agitating portion corresponding to the end of the main body strut,
Wherein the flange permits internal allowance for the double pipe structure of the upper supply pipe and the lower supply pipe and secures a space of the space portion. 4. The method according to any one of claims 1 to 3,
The slurry, which is coated with ceramic and coated on the surface of the main shaft, the surface of the agitating screw, and the surface of the main agitating blade to prevent the entangled mudball phenomenon of the slurry and the paper clay,
Wherein the ceramic coating is selected from a ceramic coating material of an inorganic material capable of curing at room temperature, an organic powder, and a two-part type (composed of a base and a hardener) paste-type ceramic coating material synthesized of a polymer Improved perforated agitator. 3. A method according to claim 1 or 2, wherein the main stirring vanes and the auxiliary stirring vanes,
A slurry injected into the perforation hole and a reinforcement joined in a form to surround the surface of the main pillar with a pore width larger than the pore width of the main pillar to withstand the resistance pressure acting in the rotating direction when the soil of the pile ground is agitated And wherein the perforation stirrer is extended outwardly from the members. The method according to claim 1,
And an upper feed pipe and a lower feed pipe having a double pipe structure,
The upper supply pipe further extending from the upper end of the rod engaging portion to the lower end of the lower support pipe corresponding to the lower end portion of the auxiliary stirring vanes; And
An upper discharge port communicating with the upper supply pipe and branched in a lower left and right direction of the main body support;
The slurry is airtightly filled into the lowest floor portion of the perforated hole in the course of the drilling,
An injection nozzle passing through the space through a lower discharge port communicating with the lower supply pipe;
Wherein the agitation of the hard ground is dissociated by the high pressure water injected through the agitator.

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