KR100834923B1 - Soft ground improvement device and soft ground improvement method using same - Google Patents

Abstract

In the present invention, compressed air, cutting water, hardened material and a high viscosity high-strength mortar inlet is formed on the upper side, compressed air, cutting water and hardened material discharge port in communication with the compressed air, cutting water and the hardened material inlet is formed on the side, the high viscosity A high viscosity high strength mortar discharge port communicating with the high strength mortar inlet comprises a rod formed at the bottom, wherein the compressed air and the cutting water discharge port is formed to inject the compressed air and cutting water upwards by about 5 ° in the horizontal direction, The hardening material discharge hole is formed so as to spray the hardening material in the horizontal direction, and relates to a soft ground and small-scale joint filling improving device and a method for improving the soft ground using the same is formed at a position spaced downward downward from the compressed air and the cutting water discharge port. , To prevent the injection material such as mortar and hardener to be discharged to the outside, By discharging the high-viscosity high-strength mortar at the outlet and the flow rate is suitable for rapid resin or a large cavity, not only the productivity is remarkably improved robustness of the underground grouting, and can be uniformly constructed.

Description

Apparatus for Improvement Soft Ground And Method For Improvement Soft Ground Use Of It}

1 is a cross-sectional view showing a soft ground improvement device according to the present invention.

2 to 3 is a process chart showing a soft ground improvement process according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: rod 112: compressed air inlet

122: cutting water inlet 132: hardening material inlet

142: mortar injection port 114: compressed air flow path

124: cutting water flow path 134: hardening material flow path

144: mortar flow path 116: compressed air discharge port

126: cutting water discharge port 136: hardening material discharge port

146: mortar discharge port 150: cutting bit

The present invention relates to a soft ground improvement device and a soft ground improvement method using the same. Specifically, a soft ground improvement device suitable for preventing rapid discharge of injection materials such as mortar or hardened material to the outside and having a high flow rate or a large cavity. And it relates to a method for improving the soft ground using the same.

In general, the ground improvement method is a method of strengthening the strength of the ground by injecting and hardening injection materials such as chemical liquid and cement milk into the ground, and the ultra-high pressure injection filling method (SIG method), the high pressure filling method (SRC method), and the ultra-high pressure spray stirring method. (RJP method), high pressure spray stirring method (JSP method), etc. are widely used.

The SIG method is rotated while spraying a jet stream of ultra-high pressure (P = 400 ~ 600㎏ / ㎠) to discharge the soft soil, and to form a large diameter cylindrical solidified body having a diameter (Φ) of 1200 ~ 2000㎜ in the discharged space As a process, it is mainly used for the soil layer, sand layer, gravel layer, soft rock layer, and viscous soil layer with N <10.

SIG method is a method of forming reinforcing ground with excellent ground strength and durability that is completely different from the original ground by injecting cement milk into the discharged space while discharging the soft soil dust of limestone cavity or crushing zone with high pressure water. According to this method, it is possible to solve the problems of the surrounding ground uplift due to the injection of high pressure injection and the weakening of the ground due to the spout, which are disadvantages of the conventional jet grouting. Since it is easy and especially a substitution method, there is a remarkable advantage of increasing strength after reinforcement.

However, in the above-described SIG method, when large cavities are interconnected, an excessive amount of grout is generated, the cement shrinks while hardening, and thus the base is not closely contacted with the hardening material.

In addition, the SRC method is a method of cutting and relaxing the ground using ultra-high pressure water (0 ~ 800㎏ / ㎠) accompanied by compressed air during drilling, and is a method of mixing the discharged cutting soil with solidified material and reused as grout material .

In this SRC method, ITO discharged during cutting and filling (substituting) is used as a mixture of cutting water and filling material, so the slime is drastically reduced, and it is classified as Isu and Ito and reused. It is a general method, and by adjusting the mixing ratio of the filler, it is possible to adjust the strength suitable for the purpose of improvement, there is an advantage that does not affect the ground or surrounding structures during construction.

However, the above-mentioned SRC method needs to replenish grout material when the amount of discharged soil is small, and the equipment is complicated because the slime is reprocessed and re-injected. This is impossible, and when the contact with the ground water when filling the grout material material separation phenomenon and there is a disadvantage that can not be replaced by gravel and sandy soil in the cavity.

In addition, the above-mentioned RJP method rotates while spraying jets of ultra-high pressure (P = 400-600 kg / cm 2), and agitates with the soft soil of the ground to make a large-diameter cylindrical solid body having a diameter (Φ) of 1200 to 2000 mm. As a composition method, it is mainly used for a soil layer, a sand layer, and a viscous soil layer with N <10.

This RJP method is free from vibration and noise and can be installed in urban areas and does not require any auxiliary work. It is easy to adjust the size of the cross section by adjusting the rotational drawing speed of the multi-pipe rod. Since the cement milk is agitated and integrated with the surrounding ground, there is an advantage of forming a reinforced ground having excellent ground strength and durability.

However, the above-mentioned RJP method is inferior to the SIG method, and the strength of the improved body (maximum strength = 60㎏ / ㎠) and economical efficiency are reduced, and when large cavities are interconnected, excessive grout injection occurs and the cement hardens and shrinks. There is a disadvantage that the ground and the hardening material is not in close contact with the cavity is generated again by the groundwater.

In addition, the JSP method described above is a method of forming a columnar solidified body having a diameter (Φ) of about 800 to 1000 mm in the ground by rotating while jetting a jet of high pressure (P = 200 kg / ㎠), mainly earth and sand layer , Is used for viscous soil layers with N <10.

This JSP method can be constructed in any way vertically or inclined. Especially, it can work in a narrow place (basement of a building, lower part of a bridge, etc.), so it is suitable as a reinforcement method of an existing structure. It is improved in various ways by the combination of the arrangements, and the grout material is filled in the pores artificially made in the ground, so it has an advantage of hardly affecting nearby structures or underground works like the usual chemical injection method.

However, the above-mentioned JSP method is difficult to control quality due to the development of required strength, because the improved body is a kind of soil cement formed by soil and cement milk, and the strength of the improved body (maximum strength = 40㎏ / ㎠) and There is a disadvantage of low economic efficiency. In addition, when large cavities are interconnected, the grout injection amount is excessively generated, and the cement is cured and contracted so that the ground and the hardening material are not in close contact with each other.

Therefore, the present invention is to solve the above-mentioned problems as much as possible to prevent the injection material is discharged to the outside, the soft ground and small cavity filling effect through the hardener injection discharge port of the lower side of the rod and the low slump value through the inlet of the lower end of the rod The purpose of the present invention is to provide a device for forming a high strength column in a layer or a large cavity having a high flow rate by injecting a high viscosity high strength injection material and a method for improving the soft ground using the same.

In the soft ground improvement apparatus according to the present invention for achieving the above object, the compressed air, the cutting water, the hardening material and the high viscosity high-strength mortar inlet is formed on the upper side, the compressed air, the cutting water and the hardening material inlet communication Air, cutting water and hardener discharge port is formed on the side, and the high viscosity high-strength mortar injection port in communication with the high viscosity high mortar discharge port is formed at the bottom, the compressed air and the cutting water discharge port is about 5 ° upward in the horizontal direction It is formed so that the compressed air and the cutting water can be injected, wherein the curing material discharge port is formed so as to spray the curing material in the horizontal direction and is formed at a position spaced apart from the compressed air and the cutting water discharge port downwards a predetermined distance do.

In addition, the soft ground improvement method using the soft ground improvement apparatus according to the present invention comprises the steps of perforating the ground vertically to the planned depth using the soft ground improvement device, and rotating the sprayed compressed air, cutting water and hardener to ground the ground. Excavation or filling the soft ground and small cavities to discharge the slime to the outside, and pressure discharge the high viscosity high-strength mortar through the discharge port provided in the lower end of the rod to form a columnar solidified body in the ground, The mortar used at this time is characterized in that the slump value is 5 to 8.

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

1 is a cross-sectional view showing a soft ground improvement device according to the present invention.

As shown in Figure 1, the soft ground improvement apparatus according to the present invention is composed of a rod 100 for transporting and spraying different types of fluid.

The rod 100 has a circumferential shape having a predetermined length, and a plurality of injection holes 112, 122, 132, and 142 are formed at the upper end thereof to supply compressed air, cutting water, a hardening material, and high strength mortar. Inwardly communicating with the respective injection holes 112, 122, 132, 142, respectively, the flow paths 114, 124, 134, 144 through which compressed air, cutting water, hardener, and high-strength mortar are transferred are formed.

In addition, discharge ports 116, 126, and 136 are formed on the outer circumferential surface of the rod 100 to communicate with the compressed air, cutting water, and hardener flow paths 114, 124, and 134 to inject each fluid transferred from them to the outside. The discharge port 146 is formed on the lower end surface of the rod 100 to communicate with the high-intensity injection material flow path 144 and to pressurize the high-strength mortar transferred therefrom to the outside.

The compressed air and the cutting water discharge ports 116 and 126 are configured to communicate with each other, and are formed in a shape of opening outwardly in place in the longitudinal direction of the rod 100. In addition, the curing agent discharge port 136 is formed in the form of an opening outward on the outer peripheral surface of the lower end of the rod (100).

In addition, a cutting bit 150 for drilling the ground is provided on the outer peripheral surface of the lower end of the rod 100. The rod 100 of this configuration rotates to inject and discharge compressed air, cutting water, hardener, and high strength mortar.

The rod 100 thus formed is formed in a quadruple tube so that compressed air, cutting water, hardened material and high-strength mortar conveyed therein are not mixed with each other. In addition, the compressed air, the cutting water, and the hardening material discharge holes 116, 126, and 136 are provided in plural and spaced apart at equal intervals along the outer circumferential surface of the rod 100.

At this time, the compressed air and the cutting water discharge openings 116 and 126 are formed in a shape capable of injecting the compressed air and the cutting water upwards by about 5 ° from the horizontal direction, and the hardening material discharge opening 136 is a hardening material in the horizontal direction. It is formed in a shape capable of spraying and is formed at a position spaced at least 0.5m or more from the compressed air and the cutting water discharge port (116, 126). The reason why the compressed air and the cutting water discharge ports 116 and 126 are formed at a predetermined angle and separated from the curing material discharge port 136 by a predetermined distance is such that the pressure point zone Z is formed therebetween. This is to prevent mixing with slime (see FIG. 3).

This will be described in more detail as follows.

The compressed air and the cutting water injected from the compressed air and the cutting water discharge ports 116 and 126 are mixed with the curing material injected from the curing material discharge port 136 from a predetermined point. However, when the compressed air and the cutting water and the hardening material are mixed in this way, the hardener is discharged together along with the compressed air and the cutting water discharged to the outside, thereby increasing the use of the hardening material. In addition, the compressed air and the cutting water are also mixed with the excavated sand excavated by them, the mixed mixture (slime) is discharged to the outside by a separate equipment for disposal. However, when disposed of in a mixed state, it pollutes the environment, so it is common to remove only solidified soil dust by removing moisture from slime.

However, as described above, when the hardening material is included in the slime, after removing the hardening material, the earth and sand should be solidified. This may cause a lot of time, equipment, and manpower.

Therefore, in order to solve this problem, the compressed air and the cutting water discharge holes 116 and 126 should be formed to be sprayed upward by about 5 ° in the horizontal direction, and at least 0.5 m away from the hardening material discharge hole 136. In this case, as shown in FIG. 3, a pressure point zone Z is formed between the compressed air and the cutting water discharge ports 116 and 126 and the curing material discharge port 136 to prevent mixing of the curing material with the slime.

The soft ground improvement apparatus according to the present invention having such a configuration and shape is formed of a multi-pipe (quadruple pipe), which enables simultaneous injection of compressed air, cutting water, hardened material, and mortar, thereby significantly improving work productivity. It can be installed firmly and uniformly. In addition, the pressure point zone (Z) is formed between the compressed air and the cutting water discharge port (116, 126) and the hardener discharge port 136, so that the hardener is not mixed in the slime, thereby solidifying the slime discharged to the outside easily. Become.

2 to 4 is a process diagram showing a soft ground improvement process according to the present invention, the soft ground improvement method using the soft ground improvement apparatus according to the present invention with reference to the drawings as follows.

First, as illustrated in FIG. 2, the soft ground is drilled to the planned depth using the rod 100 of the soft ground improving apparatus described above. At this time, the drilling work of the ground is made by the cutting bit 150 provided on the lower end of the rod 100, can be perforated in various directions as required by the user.

When the drilling is completed, as shown in Figure 3 through the rod 100 according to the present invention by rotating spraying the compressed air, cutting water and the hardener to excavate the ground and discharge the slime to the outside. At this time, the slime discharged to the outside is not mixed with the hardening material as described above, it is easy to solidify the soil dust.

When the space above the predetermined height is formed through the above-described process, as shown in FIG. 4, the hardener is filled in the soft ground and the small cavity through the upper and lower discharge ports, and the high viscosity at the discharge hole (146 in FIG. 1) formed at the bottom of the rod. High pressure mortar is extruded to form columnar solid bodies in the ground. In this case, it is preferable to use mortar having a slump value of 5 to 8 as an injection material in a layer or a large cavity having a high flow rate. More preferably, the water composition ratio of the mortar is 65 to 70%. Thus, when high viscosity high strength mortar is used, it is easy to produce high viscosity high strength solidified body.

As described above, the configuration of the soft ground improvement apparatus and the soft ground improvement method using the same according to the preferred embodiment of the present invention are shown in accordance with the above description and the drawings, but this is merely an example and the technical spirit of the present invention. Those skilled in the art will appreciate that various changes and modifications can be made without departing from the scope of the invention.

As described above, in the soft ground improvement apparatus and the soft ground improvement method using the same, the pressure point is formed between the compressed air and the cutting water discharge port and the hard material discharge port, so that the slime is not mixed with the slime, and thus the slime discharged to the outside. Separation is very easy.

In addition, since it is formed of a multi-pipe, it is possible to simultaneously inject compressed air, cutting water, hardened material and high viscosity high-strength mortar, thereby significantly improving work productivity, and firmly and uniformly constructing ground grouting.

In addition, the low slump mortar is used as an injection material, which can be used for high flow rates and large cavities.

Claims (5)

delete In soft ground improvement device, Compressed air, cutting water, hardened material and high viscosity high strength mortar inlet is formed on the top, compressed air, cutting water and hardened material inlet communicating with the compressed air, cutting water and hardener inlet is formed on the side, and the high viscosity high strength mortar inlet and The high viscosity high-strength mortar discharge port communicating with the rod is formed in the center of the lower end, wherein the inlet and the discharge port is formed of a quadruple pipe so that the compressed air, cutting water, hardener and high viscosity high-strength mortar can be transported without mixing with each other, The compressed air and the cutting water discharge port are formed to inject the compressed air and the cutting water upwards by about 5 ° from the horizontal direction, and the hardening material discharge port is formed to spray the hardener in the horizontal direction, And the hardened material discharge port is formed at a position spaced downward from the compressed air and the cutting water discharge port by a predetermined distance. delete delete In the soft ground improvement method, Perforating the ground vertically to the planned depth using the soft ground improvement device according to claim 2; Rotating spraying compressed air, cutting water and hardening material to excavate the ground or to fill the soft ground and the small cavity and discharge the slime to the outside; Pressure discharge the high viscosity high-strength mortar through the discharge port provided in the lower end of the rod to form a columnar solidified body in the ground; It consists of, the mortar is 65 to 70% water mixing ratio and the slump value is 5 to 8, characterized in that the soft ground improvement method.

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