KR100852471B1 - Apparatus of ground improvment using mildle and high pressure in hardening set injection - Google Patents

Abstract

An ultra high pressure rapid set injection type ground improvement apparatus is provided to increase ground cutting force by a nozzle with downward injection, to prevent the expansion of the pressure of the ground, to prevent the uplift and subsidence of the ground and to perform excavation work, stir work and pull-out work effectively. An ultra high pressure rapid set injection type ground improvement apparatus is used for ground improvement by injecting cement hardener, quick setting admixture and air through an injection rod(50) composed of an upper injection nozzle and a lower injection nozzle, wherein the upper injection nozzle is connected with a cement hardener supply way and placed in an air supply way at a download inclination of 5~10 degrees to be exposed outward, and the lower injection nozzle is connected with the cement hardener supply way and placed in a quick setting admixture supply way at a downward inclination of 1~10 degrees to be exposed outward, and the injection rod is attached with one of a blade or a screw by ground conditions to improve the ground.

Description

APAPATUS OF GROUND IMPROVMENT USING MILDLE AND HIGH PRESSURE IN HARDENING SET INJECTION

The present invention relates to a ground improvement device, and more specifically, to make a ground injection to the ground improvement unit to increase the ground cutting force while preventing the ground pressure from expanding, preventing the rise and settlement of the ground, excavation work, stirring work and drawing The present invention relates to an ultra-high pressure jet ground improvement device that performs work more efficiently.

In general, the ground improvement stirring device is used in the deep mixing treatment method, and the deep mixing treatment method is a deep in the field to improve the properties of the soil such as cement, bentonite, lime, solidified material, slag, or microorganism in the soil, or to remove contaminants. Mixed materials that can be solidified or processed can be mixed with soil while entering the ground at low or high pressure using a special multi-shaft auger machine that can rotate 1 to 3 axes of auger shafts with agitator blades. It refers to the continuous improvement method for underground, which increases physical and chemical changes such as increase in weight, decrease in water content, increase in bonding strength, and microbial treatment, to increase water-order and compressive strength, and to prevent contamination from spreading.

The conventional method is used for constructing continuous continuous walls such as soft ground reinforcement, earth walls of underground trenches, and water walls of river banks in civil engineering.In the ground environment field, it is a shielding wall that blocks the movement of contaminated groundwater such as unsanitary landfill and waste mine. It is used for stabilization or immobilization of contaminated soil to prevent the spread of contamination of heavy metals or semi-volatile organic compounds, and it is also used for biological treatment of contaminated soils by mixing them with microorganisms and adding zeolites. It is also used to create permeable walls with the ability to purify contaminated groundwater.

In general, the ground improvement agitation device should dig the ground to be improved to the desired depth of the auger shaft, for this purpose, the excavation wing is provided at the tip of the auger shaft.

As a conventional technique in which such excavation wings have been described, Japanese Laid-Open Patent Publication No. Hei 1-219210, "Soft Ground Improvement Device", is known.

However, in the case of excavation using only the excavation wing as described above, the excavation is easily performed in the case of the soft ground, but if the rock layer or the gypsum layer is present in the ground to be improved, mechanical damage occurs rather frequently.

On the other hand, the water is sprayed up and down to block the hardened material and the ground soil sprayed from the lower injection hole by the lower injection hole, but this is a complicated structure, the water injection hole formed in the upper and lower are in communication with the same line Since the spray pressure of water is weak, there is less soil to be cut, and thus there is a problem in that a hardened layer having a large diameter cannot be formed.

In addition, there is also a domestic patent publication No. 92-1474 in order to form a large diameter of the hardened layer, which is mutually absorbed the injection reaction during the injection by the injection holes are stacked in the left and right, and the soil cutting diameter by spraying the purity hardening material with the gas It is to increase the size of the hardened layer, which is mixed with soil and the hardener to form a hardened layer. Therefore, the density is not dense and the components of the hardened layer have many soil components. have.

The present invention was devised to solve the problems of the prior art, and by increasing the ground cutting force by the nozzle which is sprayed downward to the ground improvement part and prevents the ground pressure to expand while preventing the elevation and settlement of the ground and excavation It is an object of the present invention to provide an ultra-high pressure jet ground improvement device for performing the work, the stirring work and the drawing work more efficiently.

In particular, the present invention is to provide an ultra-high pressure jet injection type ground improvement apparatus which can secure the designed body diameter while preventing the cement consumption to the unnecessary section through the downward spraying of the nozzles arranged the upper and lower ends of the ground improvement portion at a predetermined interval.

The present invention for achieving the above object, the check valve at the bottom of the injection rod is provided with a cement hardener supply passage, a fastener supply passage and an air supply passage formed in a double or triple by one or more tubes of different diameters, respectively In the ultra-high pressure jet injection type ground improvement apparatus comprising a, connected to the cement hardener supply passage 10 and disposed in the air supply passage 14 area exposed to the outside and made a downward slope of 5 ~ 10 ° 100ℓ / min ~ 250ℓ The upper spray nozzle 20 spraying at / min, and the cement hardening supply path 10 connected to the cement hardening supply path 10 at a position 25 to 35 cm from the upper spray nozzle 20 and disposed in a quick supply supply path 12 region. And a lower part yarn nozzle 30 which is exposed to the outside and sprays at a rate of 10 L / min to 50 L / min by making a downward slope of 1 to 10 °, and the injection passage 50 has wings 62 or Screw 64 is attached and is either vertical or horizontal It characterized in that formed is arranged in a direction.

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In the present invention as described above, the ground cutting force is increased by the spray nozzle inclined downward at a predetermined angle, thereby achieving a smooth and smooth ground improvement area, and at the same time, the improvement work is performed only in the optimum area, thereby achieving a uniform improvement composition. In addition, by the above effect, as well as the vertical method as in the previous method, it is possible to form an improved body in all directions to prevent the elevation and settlement of the ground while preventing the pressure on the target ground from expanding.

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

1 is a schematic configuration diagram of a ground improvement apparatus according to the present invention, and FIG. 2 is a cross-sectional view of an injection rod according to the present invention.

As shown in Figs. 1 and 2, the present invention provides the upper injection nozzle 20 and the lower portion of the cement hardener, the fastener and the air alone or in combination through the respective supply passages 10, 12 and 14, respectively. The ground improvement is achieved by spraying through the spray nozzle 30.

Here, the upper spray nozzle 20 is connected to the cement hardening supply path 10 and is disposed in the air supply path 14 to form a downward slope so as to be exposed to the outside.

In addition, the lower partial nozzle 30 is connected to the cement hardening supply path 10 at a position spaced apart from the upper injection nozzle 20 and is disposed in the fastener supply path 12 to form a downward slope so as to be exposed to the outside. .

The upper injection nozzle 20 and the lower partial nozzle 30 are connected to each other or in combination with the cement hardener supply path 10, the air supply path 14, and the fastener supply path 12 to enable the operation. Upper injection nozzle while having a circulation path and inserting the completed injection rod 50 at a predetermined position in the target ground by installing the injection rod 50 to be integrally formed in the same direction during the injection, and rotating at a pressure of 200 to 400 Kgf / cm 2. The cement hardener and the fastener injected into the 20 and the lower part four nozzles 30 vortex to form a hardened layer.

Here, when the ground is improved, the cement hardener is sprayed at a rate of 100 l / min to 250 l / min and a fastener is 10 l / min to 50 l / min to form a cured layer.

On the other hand, by forming a double or triple in one or more pipes of different diameter, respectively, at the bottom of the injection rod 50 is provided with a cement hardener supply passage 10, a fastener supply passage 12 and an air supply passage 14 The improvement device in which the check valve 52 is assembled is comprised.
The check valve 52, as known in the art, allows to eject high pressure water or cement hardener.

The upper injection nozzle 20 is connected to the cement hardener supply path 10 and disposed in the air supply path 14 and forms a 5 to 10 ° downward slope, and is spaced apart from the upper injection nozzle 20. It is connected to the cement hardener supply path 10 and disposed in the area of the fastener supply path 12 is provided with a lower injection nozzle 30 to form a 1 to 10 ° downward inclination, the upper injection nozzle 20 and the lower It consists of the injection nozzle 30 and constitutes the injection rod 50 which is disposed in either the vertical or horizontal direction.

The lower partial nozzle 30 is composed of a twin nozzle.

The lower part nozzle 30 is installed 25 cm to 35 cm away from the upper injection nozzle (20).

The injection rod 50 having the upper injection nozzle 20 and the lower partial nozzle 30 is disposed in one of horizontal or vertical directions to achieve ground improvement.

3 is a front view showing another embodiment of the injection rod according to the present invention, Figure 4 is a front view showing another embodiment of the injection rod according to the present invention.

As shown in Figures 3 and 4, the injection rod 50 is attached to any one of the blade 62 or screw 64 suitable for the ground conditions to achieve the ground improvement.

The present invention as described above, as shown in Figs. 1 and 2 through the upper injection nozzle 20 and the lower part injection nozzle 30 to achieve the ground improvement by supplying the cement hardener and the supply of the fastener, the upper injection nozzle (20) The lower part yarn nozzle 30 can be injected at the most suitable used pressure when the ground is improved.

This is achieved by improving the uneconomical point by improving the uneconomical point by improving the uneconomical point by increasing the time for improvement and the increase of material consumption.

In addition, the upper injection nozzle 20 is sprayed downward to 5 ~ 10 ° to increase the ground cutting force and to prevent the rise and settlement of the ground while preventing the pressure is flat when horizontal.

In addition, the lower part injection nozzle 30 is sprayed downward at 1 to 10 ° so as to secure an improved diameter of the designed body while preventing cement consumption to an unnecessary section.

Thus, according to the present invention, the upper injection nozzle 20 and the lower part injection nozzle 30 are disposed at both ends of the downward inclined surface, so that the injection rod 50 is rotated so that the upper part and the lower part are sprayed in the inclined state at the beginning. With one area, it is cut in X (X) shape in one revolution, and a large amount of cross-cutting condition is shown in two revolutions, so that it is possible to cut a more reliable ground densely and precisely to secure a uniform composition.

This solves the conventional problem that the ground improvement method having a horizontal cutting area is difficult to secure the uniformity of the composition due to the uneven ground improvement as the ground area which is not stirred.

The standard specification for each layer according to the present invention is shown in the table below.

Standard Specification for Twin-Jet Strata

division Drawing speed (min / M) Unit injection amount (ℓ / min) Injection amount (ℓ / M) Cement (kg / M) Water (ℓ / M) Slime treatment (㎥ / M)   Ø800mm Clay soil 3.07 120 368 280 280 0.23 Sandy soil (N = 0 ~ 15) 3.07 120 368 280 280 0.23 Sandy Soil (N = 15 ~ 30) 3.40 120 408 310 310 0.26 Gravel layer 4.17 120 500 380 380 0.29   Ø1000mm Clay soil 4.80 120 576 437 437 0.36 Sandy soil (N = 0 ~ 15) 4.80 120 576 437 437 0.36 Sandy Soil (N = 15 ~ 30) 5.31 120 637 484 484 0.39 Gravel layer 6.51 120 781 593 593 0.46   Ø1200mm Clay soil 6.92 120 830 630 630 0.52 Sandy soil (N = 0 ~ 15) 6.92 120 830 630 630 0.52 Sandy Soil (N = 15 ~ 30) 7.65 120 918 697 697 0.59 Gravel layer 9.39 120 1126 855 855 0.67   Ø1500mm Clay soil 10.80 120 1296 984 984 0.81 Sandy soil (N = 0 ~ 15) 10.80 120 1296 984 984 0.81 Sandy Soil (N = 15 ~ 30) 11.96 120 1435 1089 1089 0.91 Gravel layer 14.66 120 1759 1335 1335 1.02   Ø2000mm Clay soil 19.21 120 2305 1750 1750 1.44 Sandy soil (N = 0 ~ 15) 19.21 120 2305 1750 1750 1.44 Sandy Soil (N = 15 ~ 30) 21.27 120 2552 1937 1937 1.6

※ In case of improvement of Ø2000mm or more, or in special case such as ground with flow velocity, the amount of cement per m can be determined through test construction.

When using a twin jet tip device equipped with agitating vanes, the range of the agitator blade must be determined according to the ground conditions.

When disassembling and assembling the double pipe and triple pipe, the supply of cement hardener, water and compressed air is stopped.

The injection amount of the cement hardener is somewhat changed by the resistance in the pipe, so it may be based on 100 ~ 200ℓ / min but more or less depending on the performance and purpose of use.

In addition, the test of the pressure belt according to the present invention and the results of the fastener flow rate are as follows.

Twin jet flow chart; When drilling (results of pressure valve test)

division Pressure during valve operation Pressure after valve operation Flow rate at valve operation One 50㎏ / ㎠ 170㎏ / ㎠ 113ℓ / min 2 60㎏ / ㎠ 170㎏ / ㎠ 113ℓ / min 3 70㎏ / ㎠ 220㎏ / ㎠ 130ℓ / min 4 80㎏ / ㎠ 240㎏ / ㎠ 140ℓ / min

Quick Flow Standard Flow Rate Chart

pressure Flow 2.5㎏ / ㎠ 7ℓ / min 5㎏ / ㎠ 14ℓ / min 10㎏ / ㎠ 27ℓ / min 20㎏ / ㎠ 37ℓ / min 30㎏ / ㎠ 47ℓ / min 40㎏ / ㎠ 55ℓ / min

                              Average quick flow rate is applied within 10 ~ 59ℓ / min

                               (Depending on the ground conditions)

1 is a schematic configuration diagram of a ground improvement apparatus according to the present invention.

2 is a cross-sectional view of the main portion of the injection rod according to the present invention,

3 is a front view of the injection rod of another embodiment according to the present invention,

Figure 4 is a front view of the injection rod of another embodiment according to the present invention.

Explanation of symbols on main parts of drawing

10; 12 cement hardening supply; Rapid payment supply path

14; Air supply line 20; Upper injection nozzle

30; Lower part four nozzle 50; Injection rod

52; Check valve 62; wing

64; screw

Claims (7)

delete delete delete delete delete delete In the ultra-high pressure jet injection ground improvement apparatus comprising a check valve at the bottom of the injection rod provided with a cement hardening supply path, a fastener supply path and an air supply path by forming a double or triple with one or more pipes having different diameters, An upper injection nozzle 20 connected to the cement hardening supply path 10 and disposed in the air supply path 14 to be exposed to the outside and spraying at a rate of 5 to 10 ° downward to 100 l / min to 250 l / min; , It is connected to the cement hardener supply path 10 at a position spaced 25 to 35 cm from the upper injection nozzle furnace 20 and is disposed in the quickener supply path 12 to be exposed to the outside to form a 1 to 10 ° downward slope. Including a lower part nozzle (30) for spraying at 10 l / min ~ 50 l / min, The injection path (50), the ultra-high pressure jet injection type ground improvement apparatus, characterized in that the blade 62 or screw (64) is attached to the outer surface and disposed in either the vertical or horizontal direction.

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