KR20060027443A - The foundation grouting construction method of having used foundation digging and the equipment for grout material and this - Google Patents

Abstract

The present invention is used to fill perforations and grout materials in cavities, stone layers and cracked rocks in the ground, and an object thereof is to provide a device for ground excavation and grouting material and a ground grouting method using the same.

The ground grouting method using the apparatus for ground excavation and grout material injection according to the present invention for achieving the above object is to install the ground excavation and grout material injector of claim 1 in the target ground and at the same time the ground excavation and Drilling the ground to a constant depth and diameter using a drill bit located at the bottom of the apparatus for injecting grout material; Compressed air inlet, ultra high pressure inlet, grout material inlet, compressed air injection hole, ultra high pressure water, grout material, respectively, which are formed in the swivel of the ground excavation and grout material injection device, and the compressed air injection hole, ultra high pressure water injection hole And spraying compressed air, ultra-high pressure water, and grout material together through the grout re-injection sphere to form a solid body in the ground.

Ground excavation and grout injection device and ground grouting method using the same

Description

The foundation grouting construction method of having used foundation digging and the equipment for grout material and this}             

1 is a conceptual diagram showing a state of grouting the ground using the apparatus for ground excavation and grout material injection according to the present invention,

Figure 2 is a longitudinal cross-sectional view showing a device for ground excavation and grout material injection according to the present invention,

3a to 3e is a process diagram showing the process of grouting the ground using the apparatus for ground excavation and grout material injection according to the present invention,

Figure 4 is a longitudinal sectional view showing an embodiment of a device for ground excavation and grout material injection according to the present invention.

Explanation of symbols on the main parts of the drawing

10: compressed air inlet 12: ultra high pressure water inlet

14: grout re-entry 16: swivel

18: compressed air passage 20: ultra-high pressure water passage

22: grout re-pass 24: triple pipe rod

25: double pipe rod 26: compressed air injection port

28: ultra-high pressure jet sphere 30: grout reinjection zone

32 monitor 34 ball valve

36: casing 38: upper guide bushing

40: lower guide bushing 42: shoulder

44: drill bit 46: sleeve

48: stop ring 50: shank

52: through channel 54: piston hammer

56: pressure chamber 58: valve

60: rear head 62: valve casing

64: tube 66: nozzle

68: filter support 70: back head

72: piston area 74: gap sleeve

76 filter 78 annular space

80: drive chamber

A: Ground Excavation and Grout Injection

G: Ground P: Columnar solidified body

The present invention relates to a device for ground excavation and grout material injection and ground grouting method using the same, in particular, ground excavation and grout material injection used to excavate and grout the ground consisting of a rock layer, cracked rock, amber stone, etc. And a ground grouting method using the same.

In general, the ground injection method is a method of increasing the strength of the ground by injecting and solidifying a coagulant such as a chemical liquid or cement milk into the ground. The ultra high pressure spraying method (SIG method), the high pressure filling method (SRC method), and the ultra high pressure spray agitation method are used. (RJP method), high pressure spray stirring method (JSP method), etc. are widely used.

Here, the above-mentioned SIG method is rotated while spraying a jet flow of ultra-high pressure (P = 400 ~ 600㎏ / ㎠) to discharge the soft soil, large diameter cylindrical high diameter (Φ = 1200 ~ 2000㎜) in the discharged space As a method of forming the binder, it is mainly used in the soil layer, sand layer, gravel layer, soft rock layer and viscous soil layer of N <10.

As described above, the SIG method can solve the problems of the surrounding ground uplift due to the injection of high pressure injection, which is a disadvantage of the conventional jet grouting, and the weakening of the ground due to the spout, and the rotational drawing speed of the multi-pipe rod can be adjusted. It is easy to adjust the size, and it discharges the soft soil dust of limestone cavity or crushing zone with high pressure water, and injects cement milk into the discharged space to form the reinforcement ground with excellent ground strength and durability. In particular, the substitution method has a significant advantage in strength after reinforcement.

However, the SIG method as described above has a disadvantage in that when the large cavities are interconnected, the grout injection amount is excessively generated, the cement shrinks as the cement hardens, and the ground is not closely contacted with the hardener, so the cavity is generated again by groundwater. .

On the other hand, 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 injection material .

As described above, the SRC method is characterized in that the slime discharged during cutting and filling (substituting) is used as a mixture of cutting water and filler, so that the slime is drastically reduced. It is an environmentally friendly method with almost no, and it is possible to adjust the strength of the filler 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 SRC method as described above should refill the injection material when the amount of discharged soil is small, and the equipment is complicated because the slime is reprocessed and injected, and the soil is clay when the soil is applied to the process. It is impossible to reuse, and when filling the grout injection material, the material separation phenomenon occurs when it comes in contact with the groundwater.

On the other hand, the RJP method described above is rotated while spraying jets of ultra-high pressure (P = 400-600 kg / cm 2) and stirred with the soft soil of the ground, which is a large diameter columnar solidified body having a diameter (Φ = 1200-2000 mm). As a method of forming a metal, it is mainly used in a soil layer, a sand layer, and a viscous soil layer having N <10.

The RJP method as described above can be installed in the city center without vibration and noise, and does not require any auxiliary work, and it is easy to adjust the size of the cross section by adjusting the rotational drawing speed of the multi-pipe rod, and it is easy to adjust the size of the limestone cavity or crushing table with Since the soft soil dust and cement milk are stirred to integrate with the surrounding ground, there is an advantage of forming a reinforced ground having excellent ground strength and durability.

However, the RJP method as described above is inferior to the SIG method, and the strength (maximum strength = 60 kg / cm 2) and economical efficiency of the improved body are poor, and when large cavities are interconnected, excessive grout injection occurs and cement Shrinkage while curing has a disadvantage that the ground and the hardening material is not in close contact with the cavity again by groundwater.

On the other hand, the JSP method is a method of forming a cylindrical solidified body having a diameter (Φ = 800 ~ 1000㎜) in the ground by rotating while spraying a jet of high pressure (P = 200㎏ / ㎠), mainly earth and sand Layer, a viscous soil layer with N <10.

The JSP method as described above can be installed 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 because it is filled with grout material in the artificially made pores in the ground, there is an advantage that it does not affect nearby structures or underground works like the usual chemical injection method.

However, the JSP method as described above is difficult to quality control according to the manifestation of the required strength because the improved body is a kind of soil cement formed by the soil and cement milk, the strength of the improved body (maximum strength = 40㎏ / ㎠) compared to the SIG method ) And economical disadvantages.

In addition, the JSP method as described above has a disadvantage in that when the large cavities are interconnected, the grout injection amount is excessively generated, the cement shrinks as the cement hardens, and the ground surface and the hardening material do not come into close contact. .

Therefore, the conventional ground injection methods as described above form the structure in the ground by using the injection method suitable for the ground conditions in the state of drilling the ground to a certain diameter and depth using the drilling equipment in the field, Since there is a way to improve, there is always a problem that the drilling equipment for ground drilling and the injection equipment for injecting grout material should be performed in parallel.

Therefore, the present invention has been devised to solve the problems of the above-described methods, the drilling and injection device as a single device to easily excavate the ground consisting of a rock layer, cracked rock, amber stone, etc. And it is an object of the present invention to provide a ground excavation and grout material injection apparatus and a ground grouting method using the same to allow the grout material to be filled to form a solid body in the ground.

Ground excavation and grout material injection device according to the present invention for achieving the above object is located in the upper, swivel formed with compressed air inlet, ultra-high pressure inlet, grout material inlet; A triple pipe rod mounted on the lower portion of the swivel and communicating with each other and having a compressed air passage, an ultra-high pressure passage, and a grout passage; A monitor mounted on the lower portion of the triple pipe rod and communicating with each other and having a compressed air jet port, an ultra-high pressure jet port, and a grout re-injection port; An injection device portion comprising a ball valve installed at a lower end of an inner surface of the monitor;

A casing coupled to a lower portion of the monitor and formed in a cylindrical shape; Upper and lower guide bushings which are positioned at a lower end of the casing and disposed up and down; A shoulder installed between the upper and lower guide bushings to support the upper guide bushing; A drill bit mounted in the lower guide bushing to be fixed in each direction and to be restricted in the axial direction; A sleeve installed between the lower guide bushing and the drill bit and having a thread formed inside the casing; A stop ring mounted between the lower guide bushing and the sleeve to prevent the drill bit from being separated; A piston hammer arranged to impact the shank of the drill bit and having a through channel; A valve for controlling the reciprocating motion of the piston hammer and simultaneously pressurizing and depressurizing the pressure chamber; A valve casing surrounding the valve and having a rear head threaded into the rear end of the casing; A tube formed in the center in the longitudinal direction inwardly of the valve casing; A nozzle installed on the tube; A filter support supported on the rear head of the valve casing; A back head coupled inward on the filter support; The pressure chamber is characterized in that the excavation device portion consisting of a piston region formed to drive the piston hammer forward when the pressure chamber is pressurized by a valve.                         

In addition, the ground grouting method using a device for ground excavation and grout material injection according to the present invention for achieving the above object is at the same time to install the device for ground excavation and grout material of claim 1 in the target ground Drilling the ground to a certain depth and diameter using a drill bit located at the bottom of the device for drilling and grouting material injection; Compressed air inlet, ultra high pressure inlet, grout material inlet, compressed air injection hole, ultra high pressure water, grout material, respectively, which are formed in the swivel of the ground excavation and grout material injection device, and the compressed air injection hole, ultra high pressure water injection hole And spraying compressed air, ultra-high pressure water, and grout material together through the grout re-injection sphere to form a solid body in the ground.

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

1 is a conceptual diagram showing a state of grouting the ground using the apparatus for ground excavation and grout material injection according to the present invention, Figure 2 is a longitudinal cross-sectional view showing a device for ground excavation and grout material injection according to the present invention. .

As shown in these figures, the ground drilling and grout injection device according to the present invention is located at the top, the compressed air inlet 10, ultra-high pressure water inlet 12, the swivel formed with a grout material inlet (14) 16); A triple tube rod (24) mounted on the lower portion of the swivel (16) and communicating with each other and having a compressed air passage (18), an ultra-high pressure passage (20), and a grout re-pass passage (22); A monitor 32 mounted on the lower portion of the triple pipe rod 24 and communicating with each other and having a compressed air jet port 26, an ultra-high pressure jet port 28, and a grout re-injection port 30; An injection device portion formed of a ball valve 34 installed at a lower end of an inner surface of the monitor 32;

A casing 36 coupled to a lower portion of the monitor 32 and having a cylindrical shape; Upper and lower guide bushings 38 and 40 positioned on the lower end of the casing 36 and disposed up and down; A shoulder 42 provided between the upper and lower guide bushings 38 and 40 to support the upper guide bushing 38; A drill bit (44) mounted in the lower guide bushing (40) so as to be fixed in each direction and limited in the axial direction; A sleeve 46 installed between the lower guide bushing 40 and the drill bit 44 and having a thread formed inside the casing 36; A stop ring (48) mounted between the lower guide bushing (40) and the sleeve (46) to prevent the drill bit (44) from being separated; A piston hammer (54) disposed to impact the shank (50) of the drill bit (44) and having a through channel (52); A valve 58 for controlling the reciprocating motion of the piston hammer 54 and simultaneously pressurizing and depressurizing the pressure chamber 56; A valve casing (62) surrounding the valve (58) and having a rear head (60) threaded into the rear end of the casing (36); A tube (64) formed in the center in the longitudinal direction inwardly of the valve casing (62); A nozzle (66) installed on the tube (64); A filter support (68) supported by the rear head (60) of the valve casing (62); A back head 70 coupled inwardly on the filter support 68; The pressure chamber 56 is constituted by an excavation device portion including a piston region 72 formed to drive the piston hammer 54 forward when the pressure chamber 56 is pressurized by the valve 58.

In addition, the grout material to be injected into the ground drilling and grout material injection device according to the present invention as described above, the grout material is a liquid suspension containing a hardening foot as the main component A liquid, montmononite clay mineral and aluminum The fluid-based viscous liquid containing powder as the main component is B liquid, and the liquid A and liquid B are mixed in the vicinity of the high pressure pump inlet by a separate mixing device, and the liquid A is mixed with the liquid B through the high pressure jet. It penetrates and secondaryly expands the grout material due to the foaming by chemical reaction of the alkali component of the cement and aluminum powder, thereby consolidating the base and the grout material.

That is, the device (A) for ground excavation and grout material injection according to the present invention is largely composed of the swivel 16, triple tube rod 24, the monitor device 32 and the casing 36, drill bit 44 ), An excavation device portion consisting of a piston hammer 54 is an organic combination.

Here, the electron injecting unit is provided with a swivel 16 at the top end, the compressed air inlet 10, the ultra-high pressure inlet 12 to inject compressed air, ultra-high pressure, grout material into the swivel 16 And a grout reinforcing hole 14 formed therein.

In addition, the triple pipe rod 24 corresponds to the compressed air inlet 10, the ultra high pressure water inlet 12 and the grout reinforcing inlet 14 corresponding to each component of the swivel 16, respectively, compressed air, ultra high pressure The compressed air passage 18, the ultra-high pressure passage 20, and the grout ash passage 22 for conveying water and grout material are formed.

In addition, the monitor 32 is compressed air injection port 26 and the ultra-high pressure water injection port 28 and the grout re-injection port 30 to inject the compressed air, ultra-high pressure and grout material to correspond to each of the triple pipe rod (24) ) Is formed.

Here, the grout re-injection port 30 of the monitor 32 is formed radially outward on the circumferential surface thereof, and the compressed air injection port 26 is compressed at high pressure in the radial direction outward from the circumference of the grout re-injection port 30. It is a structure formed to inject air.

In addition, a ball valve 34 is installed at the lower end of the inner surface of the monitor 32, and the ball valve 34 is a valve for restricting the supply of liquid to the excavator driven by the liquid, and the ball valve 34 is provided. When the piston hammer 54 and the drill bit 44 of the excavation unit is opened, the excavator unit maintains the stopped state when it is closed.

The latter rig has a casing 36, the main part of which is a cylindrical tube with a shoulder 42 and an inner thread at each end.

The drill bit 44 is located in the casing 36 by a sleeve 46 threaded into the tube 64 or the casing 36.

The sleeve 46 is located at the top of the drill bit 44, the drill bit 44 is guided into the casing 36 by the sleeve 46 and the upper and lower guide bushings 38, 40, and the stop ring ( 48 prevents the drill bit 44 from falling out.

The shoulder guide 42 supports the upper guide bushing 38, and the gap sleeve 74 is supported by the upper guide bushing 38.

A valve casing 62 with a rear head 60 is supported on the gap sleeve 74, and a tubular filter support 68 with a filter 76 is supported on the rear head 60 of the valve casing 62. All.

The rear head 60 is screwed to the rear of the casing 36, the upper and lower guide bushings 38 and 40, the gap sleeve 74, the valve casing 62, the rear head (42) on the shoulder 42 60), the filter support 68 is tightened in the axial direction.

The upper and lower guide bushings 38 and 40, the gap sleeve 74, the valve casing 62, the rear head 60, and the filter support 68 serve as springs, and their cumulative distances are the rear head ( 60 is the distance they are compressed when screwed in.

Here, the spacing sleeve 74 has a significant effect on the compression, because it has a relatively small cross-sectional area and the length of the spacing sleeve 74.

The filter support 68 may have approximately the same cross-sectional area as the spacing sleeve 74 but is actually smaller than the spacing sleeve 74.

Thus, the rear head 60 of the valve casing 62 tightens the main part of the valve casing 62.

The rear head 60 is arranged to transmit the rotation to the excavator device, and to deliver the hydraulic drive water in the form of pressurized water.

In operation, the annular space 78 on the back of the valve casing 62 is continuously filled with filtered water under pressure.

When assembling the drive unit, the upper and lower guide bushings 38 and 40, the gap sleeve 74, the valve casing 62, the rear head 60, and the filter support 68 are loosely stacked to simplify the assembly. Directional tolerance is reduced.

Additional tolerances are handled by the axial elastic compression, and all parts of the drive unit slide easily in the drive unit and are therefore easily removed when disassembling the drive unit.

The tube 64 forms part of the valve casing 62, and the piston hammer 54 with the through channel 52 has a front end leading into the upper guide bushing 38.

The rear end of the piston hammer 54 extends into the drive chamber 80 formed in the valve casing 62 between the valve casing 62 and the tube 64.

Thus, the piston hammer 54 is guided by the valve casing 62.

The piston hammer 54 has a different piston area in the drive chamber 80 formed in the axial direction between the upper and lower guide bushings 38 and 40 and the valve casing 62.

On the other hand, in the ground drilling and grout injection device according to the present invention, the grout material is injected, the fluid suspension containing the hardening footing as a main component A liquid, and the monmononite clay mineral and aluminum powder as a main component One fluidized viscous liquid is B liquid, and the liquid A and liquid B are mixed in separate mixers, and the liquid A and liquid B are mixed and used at the high-pressure pump inlet.

Hereinafter, the ground grouting using the apparatus for ground excavation and grout material injection according to the present invention having the configuration as described above will be described.

3a to 3e is a process chart showing a process of grouting the ground using the apparatus for ground excavation and grout material injection according to the present invention.

As shown in these drawings, the ground grouting method using the ground excavation and grout material injection device according to the present invention is to install the apparatus (A) for ground excavation and grout material of claim 1 in the target ground (G) and Simultaneously drilling the ground (G) to a certain depth and diameter by using a drill bit (44) located at the lower end of the ground (A) and the ground grouting device (A);

Compressed air, ultra high pressure water, and grout material are respectively provided in the compressed air inlet 10, the ultra high pressure water inlet 12, and the grout material inlet 14 formed in the swivel 16 of the ground excavation and grout material injection device (A). Injecting compressed air, ultra-high pressure water, and grout material together through the compressed air injection port 26, the ultra high pressure water injection port 28, and the grout injection port 30 mounted on the monitor 32 at the same time, It consists of a step of forming a solid body (P).

Here, the columnar solidified body (P) forming step is to inject the grout material into the grout material inlet 14 formed in the swivel 16, and to inject ultra-high pressure water into the ultra-high pressure inlet 12, the monitor 32 Ultra-high pressure water and the grout through the injection port 28 and the grout re-injection 30 is mounted together, it consists of forming a columnar solidified body (P) in the ground.

That is, the ground grouting method using the apparatus for ground excavation and grout material injection according to the present invention comprises a ground drilling step and a columnar solidified body (P) forming step.

Here, the ground drilling step is to drill the ground (G) to a certain depth and diameter by using a drill bit 44 located in the lower portion of the target ground (G) by using a device (A) for ground excavation and grout material injection It's a step.

That is, the drill bit 44 excavates the ground by driving the piston hammer 54 by the pressure of the fluid, that is, the hydraulic pressure, which is not the conventional pneumatic type.

In addition, the columnar solidified body (P) forming step is the ground excavation in a state in which a perforated site is formed by boring the target ground (G) using the ground excavation and grout material injection device (A) as described above, And filling the cavity for filling consolidation of the grout material into the inner tube and the outer tube of the triple tube rod 24 while drawing the apparatus for injection of the grout material upward.

In particular, the compressed air inlet 10 of the swivel 16 of the ground excavation and grout material injection device (A) is a compressed air, the ultra-high pressure inlet 12 to inject ultra-high pressure water, grout re-inlet 14 ) Is injected into the compressed air inlet 10, the ultra-high pressure water inlet 12 and the grout material inlet 14, while the grout material is injected into the ground excavation and the grout material (A) for upward rotation Compressed air, ultra-high pressure water and grout material is mounted on the monitor 32 of the ground excavation and grout material injection device (A) compressed air injection port 26, ultra-high pressure water injection port 28 and the grout reinjection port (30) Compressed air, ultra-high pressure water and grout material are sprayed together to form columnar solidified bodies (P) in the ground.

As described above, the reason why the grout material is injected from the ground excavation and grout material injection device A and then simultaneously sprayed is based on the perforation of the ground G to draw the ground excavation and grout material injection device A at the tip end. While the grout material is injected and sprayed, when the ultra high pressure water injected through the ultra high pressure water injection port 12 through the ultra high pressure water injection port 28 is injected by a constant high pressure, the injection is drawn by the high pressure injection injection device A. At the same time, the injection of the grout material is also rotated, thereby forming a grout film that draws a circumference of a constant diameter.

That is, in the ground excavation and grout material injection device (A), the grout material sprayed by the rotational injection of the grout material naturally forms columnar solidified bodies P in the ground.

Here, the grout material is a liquid suspension having a hardening footing as a main component, A fluid, a viscous liquid liquid mainly composed of montmonillonite clay mineral and aluminum powder as a B component, and are separately filled as primary fillings. By mixing with a mixer, A and B liquids are mixed at the inlet of the high pressure pump and injected into the ground at high pressure.

Next, as a second reaction, the grout material, which was filled (injected) with only an approximate portion of the cavity by the primary filling, had an aluminum powder in the injected B solution, an alkali component (mainly calcium ion) and a foaming reaction (hydrogen gas) in the hardened expression material of the A solution. The grout can expand and fill up to the corner of the cavity.

Solution A in the grout material of the present invention refers to a hardened expression material suspension or a suspension to which aggregates or additives are added.

Here, the hardening expression material is a material which hardens and expresses when water is added, and examples thereof include cement, cement slag, and slag-lime.

In addition, as the aggregate (or heavy material) to which A solution may be added in the grout material of the present invention, sand, fly ash, lime, primary mineral fine powder (rock, quartz, limestone, dolomite, etc.), clay mineral ( Bentonite, porcelain earth, and the like), and also one kind or a combination of two or more of these aggregates.

And the dispersing agent, retarder, polymer absorbent, thickener, early hardening expression material, etc. which are added to general grout material can be added according to the objective.

In the grout material of the present invention, the term "B liquid" means a fluid viscous liquid mainly composed of aluminum powder and montmorillonite clay mineral (representative bentonite).

In addition, the aluminum powder is a plate-like structure, the surface diffusion area is preferably about 8000 cm 2 / g.

Although the amount of aluminum powder added to the grout material of the present invention varies depending on the strength of the grout material, the type and amount of the hardened expression material, the temperature, the sealed state, and the like, the amount of aluminum powder is in the range of about 0.01 to 0.10% of the hardened expression material at an expansion ratio of 5 to 40%. .

Concrete using aluminum powder, which is such a foaming agent, is called pre-concrete concrete, and this pre-concrete concrete is mainly used as underwater concrete, and aggregates are introduced into a frame installed in water, and aluminum powder, cement, fly ash, sand, water reducing agent, Concrete made by injecting mortar mixed with water into aggregate.

This principle adopts the property that mortar expands as aluminum powder in mortar reacts and foams with alkali of cement.

When constructing a grout material (mortar, etc.) incorporating this aluminum powder, 1) do not cause the grout material to expand until filling is injected into the cavity; 2) expansion is performed before the cement (grout material) is cured. Termination is the absolute condition for making a good quality grout material.

In other words, the addition of a strong alkaline hardening expression material suspension (A liquid) to the aluminum powder and the bentonite viscous liquid (B liquid) finally causes a foaming reaction.

As a result, in the actual field, the liquid A and the liquid B can be joined and mixed at the inlet, and then filled in the cavity, and then expanded to fill every corner of the cavity that could not be filled by the injection of the primary filling.

Therefore, the ground grouting method using the ground excavation and grout material injection device (A) as described above first excavated the ground downward using the ground excavation and grout material injection device (A), and then lift it upwards In addition, by filling the grout material in the perforated part of the ground, it is a single device capable of perforating and injecting, avoiding the method of using two pieces of equipment for the drilling of a separate ground (G) and two for the injection. As a result of the puncturing and injection is effected.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Figure 4 is a longitudinal sectional view showing an embodiment of a device for ground excavation and grout material injection according to the present invention.

As shown in this figure, the ground drilling and grout injection device according to the present invention is located at the top, the swivel 16 is formed with a compressed air inlet 10, the grout material inlet 14; A double pipe rod 25 mounted at the lower portion of the swivel 16 and communicating with each other and having a compressed air passage 18 and a grout re-pass passage 20; A monitor 32 mounted on the lower portion of the double pipe rod 25 and communicating with each other and having a compressed air injection port 26 and a grout reinjection port 28; An injection device portion formed of a ball valve 34 provided at a lower end of an inner surface of the monitor 32;

A casing 36 coupled to a lower portion of the monitor 32 and having a cylindrical shape; Upper and lower guide bushings 38 and 40 positioned on the lower end of the casing 36 and disposed up and down; A shoulder 42 provided between the upper and lower guide bushings 38 and 40 to support the upper guide bushing 38; A drill bit (44) mounted in the lower guide bushing (40) so as to be fixed in each direction and limited in the axial direction; A sleeve 46 installed between the lower guide bushing 40 and the drill bit 44 and having a thread formed inside the casing 36; A stop ring (48) mounted between the lower guide bushing (40) and the sleeve (46) to prevent the drill bit (44) from being separated; A piston hammer (54) disposed to impact the shank (50) of the drill bit (44) and having a through channel (52); A valve 58 for controlling the reciprocating motion of the piston hammer 54 and simultaneously pressurizing and depressurizing the pressure chamber 56; A valve casing (62) surrounding the valve (58) and having a rear head (60) threaded into the rear end of the casing (36); A tube (64) formed in the center in the longitudinal direction inwardly of the valve casing (62); A nozzle (66) installed on the tube (64); A filter support (68) supported by the rear head (60) of the valve casing (62); A back head 70 coupled inwardly on the filter support 68; The pressure chamber 56 is constituted by an excavation device portion including a piston region 72 formed to drive the piston hammer 54 forward when the pressure chamber 56 is pressurized by the valve 58.

That is, in the embodiment of the present invention, it is apparent that the characteristic feature is that the triple rod 24 of the injection unit is replaced with the double tube rod 25.

The ground grouting method using the apparatus for ground excavation and grout material injection according to the present invention having the configuration as described above is provided with the ground excavation and grout material injection device (A) of claim 2 in the target ground (G). Drilling the ground (G) to a predetermined depth and diameter using a drill bit (44) located at the lower end of the ground (G) for the ground excavation and grout material injection device (A); Compressed air and grout material are respectively injected into the compressed air inlet 10 and the grout material inlet 14 formed in the swivel 16 of the ground excavation and grout material injection device A, respectively. The compressed air injection port 26, the grout material injection port 30 through the compressed air, by spraying the grout material together, characterized in that the step consisting of forming a solid body in the ground.

Here, the grout material is a liquid suspension having a hardening footing as a main component, A fluid, a viscous liquid fluid mainly composed of montmonillonite clay mineral and aluminum powder as B liquid, and the liquid A and liquid B. The A and B liquids were mixed in the vicinity of the inlet of the high pressure pump by a separate mixing device, stirred and infiltrated into the ground through the high pressure jet, and secondly, the grout was caused by foaming by chemical reaction between the alkali component of the cement and aluminum powder The ash is expanded and the base and the grout are consolidated.

As described above, the ground excavation and grout material injection device and ground grouting method using the same according to the present invention can be used by selecting the double pipe rod 25 or triple pipe rod 24 according to the conditions of the target ground This has the advantage of widening the use of equipment.

As described above, the apparatus for ground excavation and grout material injection and the ground grouting method using the same according to the present invention have the following effects.

First, the present invention has the advantage that the uniform diameter of the improved diameter is formed by the ground boring and the filling of the grout at the same time, according to the drawing speed and injection pressure can be arbitrarily adjusted.

Secondly, the present invention press-fills the grout material to the evenly cut improved hole, there is an advantage that a solid body of homogeneous strength is formed, in particular, very good for the stone layer, amber stone, and cracked rock.

Third, the present invention does not deviate from the position to improve because the grout material is low fluidity, and is particularly effective for the gypsum and amber and cracked rock layers.

Fourth, the present invention can arbitrarily adjust the strength according to the blending of the grout material, there is an advantage that can form a high-strength bulb in the stone layer and amber and cracked rock layer.

Fifth, the present invention has the advantage that the strength can be adjusted by adjusting the slump value and the mixing ratio of the material according to the properties of the ground.

Sixth, the present invention has a safe advantage for the surrounding ground or surrounding buildings because it is consolidated and filled with the injection of the grout material.

Claims (6)

A swivel 16 positioned above and formed with a compressed air inlet 10, an ultra high pressure water inlet 12, and a grout reinforcing port 14; A triple pipe triple pipe rod 24 mounted to the lower portion of the swivel 16 and communicating with each other, and having a compressed air passage 18, an ultra-high pressure passage 20, and a grout re-pass passage 22; A monitor 32 mounted on the lower portion of the triple pipe rod 24 and communicating with each other and having a compressed air jet port 26, an ultra-high pressure jet port 28, and a grout re-injection port 30; An injection device portion including a ball valve 34 installed at a lower end of an inner surface of the monitor 32; A casing 36 coupled to a lower portion of the monitor 32 and having a cylindrical shape; Upper and lower guide bushings 38 and 40 positioned on the lower end of the casing 36 and disposed up and down; A shoulder 42 provided between the upper and lower guide bushings 38 and 40 to support the upper guide bushing 38; A drill bit (44) mounted in the lower guide bushing (40) so as to be fixed in each direction and limited in the axial direction; A sleeve 46 installed between the lower guide bushing 40 and the drill bit 44 and having a thread formed inside the casing 36; A stop ring (48) mounted between the lower guide bushing (40) and the sleeve (46) to prevent the drill bit (44) from being separated; A piston hammer (54) disposed to impact the shank (50) of the drill bit (44) and having a through channel (52); A valve 58 for controlling the reciprocating motion of the piston hammer 54 and simultaneously pressurizing and depressurizing the pressure chamber 56; A valve casing (62) surrounding the valve (58) and having a rear head (60) threaded into the rear end of the casing (36); A tube (64) formed in the center in the longitudinal direction inwardly of the valve casing (62); A nozzle (66) installed on the tube (64); A filter support (68) supported by the rear head (60) of the valve casing (62); A back head 70 coupled inwardly on the filter support 68; The pressure chamber 56 is characterized in that the excavator portion consisting of a piston region 72 formed to drive the piston hammer 54 forward when the pressure chamber 56 is pressed by the valve 58 Apparatus for ground excavation and grout injection. A swivel 16 positioned at an upper portion and having a compressed air inlet 10 and a grout inlet 14 formed therein; A double pipe rod 24 mounted to the lower portion of the swivel 16 and communicating with each other and having a compressed air passage 18 and a grout re-pass passage 20; A monitor 32 mounted on the lower portion of the rod 24 and communicating with each other and having a compressed air injection port 26 and a grout reinjection port 28; An injection device portion formed of a ball valve 34 provided at a lower end of an inner surface of the monitor 32; A casing 36 coupled to a lower portion of the monitor 32 and having a cylindrical shape; Upper and lower guide bushings 38 and 40 positioned on the lower end of the casing 36 and disposed up and down; A shoulder 42 provided between the upper and lower guide bushings 38 and 40 to support the upper guide bushing 38; A drill bit (44) mounted in the lower guide bushing (40) so as to be fixed in each direction and limited in the axial direction; A sleeve 46 installed between the lower guide bushing 40 and the drill bit 44 and having a thread formed inside the casing 36; A stop ring (48) mounted between the lower guide bushing (40) and the sleeve (46) to prevent the drill bit (44) from being separated; A piston hammer (54) disposed to impact the shank (50) of the drill bit (44) and having a through channel (52); A valve 58 for controlling the reciprocating motion of the piston hammer 54 and simultaneously pressurizing and depressurizing the pressure chamber 56; A valve casing (62) surrounding the valve (58) and having a rear head (60) threaded into the rear end of the casing (36); A tube (64) formed in the center in the longitudinal direction inwardly of the valve casing (62); A nozzle (66) installed on the tube (64); A filter support (68) supported by the rear head (60) of the valve casing (62); A back head 70 coupled inwardly on the filter support 68; The pressure chamber 56 is characterized in that the excavator portion consisting of a piston region 72 formed to drive the piston hammer 54 forward when the pressure chamber 56 is pressed by the valve 58 Apparatus for ground excavation and grout injection. Drill bit 44 located at the lower end of the ground excavation and grout material injection device (A) while installing the ground excavation and grout material injection device (A) of claim 1 in the target ground (G) Perforating the ground (G) to a constant depth and diameter using; Compressed air, ultra high pressure water, and grout material are respectively provided in the compressed air inlet 10, the ultra high pressure water inlet 12, and the grout material inlet 14 formed in the swivel 16 of the ground excavation and grout material injection device (A). At the same time, the compressed air, ultra-high pressure water and grout material are sprayed together through the compressed air injection port 26, the ultra high pressure water injection port 28, and the grout reinjection port 30 mounted on the monitor 32, thereby solidifying the ground. Soil grouting method using a device for ground excavation and grout material injection, characterized in that the step is formed. The method of claim 3, wherein The grout material is a liquid suspension having a hardening pore as its main component, A liquid, a liquid viscous liquid mainly composed of montmonillonite clay mineral and aluminum powder as B liquid, and the liquid A and liquid B respectively. A separate mixing device mixes the liquid A and the liquid B near the inlet of the high pressure pump, stirs and penetrates the ground through the high pressure injection port, and secondly, the grout material expands due to foaming by chemical reaction between the alkali component of the cement and the aluminum powder. Ground grouting method using a device for ground excavation and grout material characterized in that the ground and the grout material is consolidated. Drill bit 44 located at the lower end of the ground excavation and grout material injection device (A) while installing the ground excavation and grout material injection device (A) of claim 2 in the target ground (G) Perforating the ground (G) to a constant depth and diameter using; The compressed air inlet 10 and the grout inlet 14 formed in the swivel 16 of the ground excavation and grout material injection device (A) are respectively injected with compressed air and grout material, respectively monitor 32 Apparatus for ground excavation and grout material injection, characterized in that the compressed air, the grout material injection port (30) mounted on the sprayed together with the compressed air, grout material is sprayed together to form a solid body in the ground Ground grouting method using. The method of claim 5, The grout material is a liquid suspension having a hardening pore as its main component, A liquid, a liquid viscous liquid mainly composed of montmonillonite clay mineral and aluminum powder as B liquid, and the liquid A and liquid B respectively. A separate mixing device mixes the liquid A and the liquid B near the inlet of the high pressure pump, stirs and penetrates the ground through the high pressure injection port, and secondly, the grout material expands due to foaming by chemical reaction between the alkali component of the cement and the aluminum powder. Ground grouting method using a device for ground excavation and grout material characterized in that the ground and the grout material is consolidated.

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