KR20100122068A - Grouting method using enlarged concrete consolidation grouting apparatus - Google Patents

Abstract

PURPOSE: A compaction and pulling injection method for reinforcing foundation is provided to easily bore the ground to the desired depth by selectively using a driving unit with an auger, a hammer, or a bit according to the soft degree of the ground. CONSTITUTION: A compaction and pulling injection method for reinforcing foundation comprises steps of: carrying out a geologic survey for grasping the lipid layer of the ground, boring the ground to the desired depth by rotating an operating unit(10) with a driving unit(20), operating a concrete high-pressure pump so that an injected material is discharged through an injection path(12) to a first injection hole(12a) formed on the bottom of the operating unit, continuously injecting the injected material through the first injection port to fill the bore and consolidate the peripheral ground, cutting a spray pipe inserted through the injection path of the operating unit at the ground and fixing it to a drawing machine, and selectively spraying cement paste at high pressure to the peripheral ground through a second spray hole.

Description

Basic reinforcement consolidation drawing method {Grouting Method Using Enlarged Concrete Consolidation Grouting Apparatus}

The present invention relates to a basic reinforcement expansion-consolidation extraction injection method using a basic reinforcement expansion-consolidation drawing-out injection device, which excavates the ground with a drawing injection device formed with an excavation wing on the outer circumferential surface of the movable part, By spraying, the reinforcement expansion expansion consolidation injection injection method using the basic reinforcement expansion expansion consolidation drawing injection device that can be formed so that the pile formed by solidifying the injection material injected through the lower injection hole has a uniform basic diameter as a reinforcement body .

As a conventional underground improvement and order wall forming technology, as described in the Republic of Korea Patent Publication No. 0155195, "Compact grouting (CGS) for drilling the ground portion to be improved, and injecting grout at high pressure through the injection pipe Technology ", but the compact grouting technique as described above may cause excessive cracking of the structure of the ground, such as microcracks in the ground due to the high pressure injection of the grout. In the case of granite ground, it is difficult to consolidate grout, so it is limited to the construction according to the type of ground. Especially, when the construction is for the purpose of ordering, the unfilled part may be uneven due to irregular cross-sectional shape of the pile. In order to prevent the above leakage, increase the degree of redundancy of the barrier walls. There was an economic problem that must be constructed above.

Then, after drilling with the punched water to the planned depth of the ground to be improved, insert the injection tube of the automatic drawing device and consolidate the low flow mortar or concrete at high pressure to form a cylindrical shape in the ground. An example of the construction by the construction grouting (CGS) method and the concrete consolidation grouting (CCG) method for forming the concrete pile 100 is shown in FIG. 1. However, in this method, since concrete injected at high pressure does not sufficiently consolidate the surrounding ground according to the rigidity of the ground, concrete piles 100 having different diameters are formed according to the rigidity of the ground, which is caused by celebration and surrounding ground. There was a problem with the shear force.

In addition, since the perforated ground using the perforated water and at the same time to install the injection pipe 110, or after the completion of the drilling to insert the injection pipe 110, the diameter of the perforated hole is larger than the diameter of the injection pipe 110, When consolidation of mortar or concrete is injected, the injection material flows into the gap between the injection pipe 110 and the perforated hole, so that the injection material does not have sufficient consolidation effect due to the pressure loss of the injection material or the consolidation by the injection material is hardly achieved in the hard strata 112. There was a problem that could not be supported.

In addition, consolidation injection of mortar or concrete in the vicinity of the surface has a problem that the surface is raised (114), and the surface is not sufficiently compacted in the horizontal direction due to the surface being raised (116). There was a problem that does not play a role to form a separate tofu.

The present invention has been made to solve the above problems as an object of the present invention is to squeeze the injection material through the first inlet of the bottom after excavating the ground using the auger, hammer or bit of the excavation of the outer peripheral surface By using a reinforcement expansion and consolidation injection device that can form piles in the ground by crushing the surrounding ground by high-pressure spraying cement paste through the second injection hole according to the softness of the ground. To provide basic reinforcement expansion consolidation drawing method.

Basic reinforcement expansion consolidation pull-out injection device of the present invention, in the basic reinforcement expansion consolidation pull-out injection device for injecting the injection material into the ground, the drawing injection device is cylindrical shape connected to the lower first inlet along the longitudinal direction therein A movable part having an injection path formed therein and an auxiliary injection path connected to the second injection hole on the outer circumferential surface thereof; A driving part provided on an upper portion of the movable part to rotate the movable part and having respective injection holes communicating with the injection path and the auxiliary injection path; And control means for controlling an injection amount and an injection timing of an injection material injected through each injection hole of the driving unit. And a control unit.

The drawing injection device is characterized in that the air inlet passage further communicated with the injection passage is formed.

The first injection hole is formed in the lower portion of the movable portion, the second injection portion is characterized in that at least one formed on the outer peripheral surface of the movable portion.

The drawing injection device is characterized in that the spiral blade is further formed in the longitudinal direction on the outer peripheral surface of the movable portion.

The drawing injection device is characterized in that the auger (auger) is formed radially on the lower end of the movable portion for drilling of the ground.

The drawing injection device is characterized in that a hammer for impacting the ground is formed at the bottom of the movable portion for the drilling of the hard strata.

The drawing injection device is characterized in that a bit (bit) is formed at the bottom of the movable portion for drilling of the surface.

As the basic reinforcement expansion consolidation injection injection method using the basic reinforcement expansion consolidation injection injection device, a) geological investigation to determine the geological layer of the ground to be subjected to the expansion consolidation extraction method; b) drilling the ground to a predetermined depth from the ground surface as the movable unit 10 is rotated by the driving unit 20 on the ground after the geological survey; c) the concrete high pressure pump is operated by the control means so that the injection material injected through the injection port 22 of the drive unit 20 passes through the injection path 12 to the first injection hole 12a at the bottom of the movable part 10. Discharged; And d) injecting the injection material through the first inlet 12a continuously as the movable part 10 rises from the lower end of the perforated hole to the surface, thereby filling the perforated hole and consolidating the surrounding ground; Characterized in that it comprises a.

The injection material is characterized in that it further comprises at least any one or more of the admixture for changing the properties of the injection material and the index characteristic agent to facilitate the order (차 水).

Step b) is a step of high-pressure spraying cement paste (cement paste) to the surrounding ground through the second injection port in accordance with the ground passing through the second injection port of the outer peripheral surface of the movable portion by the control means; It characterized in that it further comprises.

Step c) is a step of high-pressure spraying the cement paste to the surrounding ground through the second injection port in accordance with the ground through the second injection port of the outer peripheral surface of the movable portion by the control means; It characterized in that it further comprises.

Another reinforcement expansion pneumatic consolidation injection device according to the present invention, the cylinder is in the shape of a movable portion is formed in the injection passage connected to the lower first inlet in the longitudinal direction therein; A driving part provided on an upper portion of the movable part to rotate the movable part and having an injection hole communicating with the injection path; An injection tube inserted into an injection path of the movable part from an upper part of the driving part and movable in a longitudinal direction of the movable part, and having a second injection hole formed on an outer circumferential surface thereof; And control means for controlling the injection amount and the injection timing of the injection material injected through the injection port and the injection tube of the drive unit; And a control unit.

The outer peripheral surface of the movable portion is characterized in that the spiral wing is formed.

The drawing injection device is characterized in that the auger (auger) is formed radially on the lower end of the movable portion for drilling of the ground.

The drawing injection device is characterized in that a hammer for impacting the ground is formed at the bottom of the movable portion for the drilling of the hard strata.

The drawing injection device is characterized in that a bit (bit) is formed at the bottom of the movable portion for drilling of the surface.

As the basic reinforcement expansion consolidation injection injection method using the basic reinforcement expansion consolidation injection injection device, a) geological investigation to determine the geological layer of the ground to be subjected to the expansion consolidation extraction method; b) drilling at a predetermined depth from the ground surface as the movable part is rotated by the driving of the driving unit in the ground after the geological survey; c) operating the high pressure concrete pump by the control means to discharge the injection material injected through the injection hole of the driving part through the injection path to the first injection hole of the lower portion of the movable part; d) As the injection pipe inserted into the injection part of the movable part is fixed, the injection material is continuously injected through the first inlet as the movable part ascends from the lower end of the perforated hole to fill the perforated hole. Consolidating the surrounding ground; e) when the movable part is raised to the surface and the injection of the injection material is completed, the injection pipe inserted through the injection path of the movable part is cut near the surface and fixed to the drawer; And f) the injection pipe is raised by the operation of the drawer, and cement paste is surrounded by the second injection hole, optionally according to the ground through which the second injection hole of the injection pipe passes by the control means. High pressure spraying into the ground; Characterized in that it comprises a.

In the step d), as the movable part rises to the surface, a separate injection tube is further coupled to the upper end of the injection tube inserted into the moving part through the injection of the movable part, and even if the movable part rises to the surface, the moving part is inside the injection path. Characterized in that the injection tube is inserted state is maintained.

The injection material includes cement and water and is characterized in that it further comprises any one or more of lime, sand, fine grain, lime or fly ash.

The injection material is characterized in that it further comprises any one or more of an admixture for changing the properties of the injection material and an index characteristic agent to facilitate the order (遮 水).

According to the configuration as described above can be used to replace the movable part formed augers, hammers or bits appropriately according to the degree of weakness of the strata, there is an effect that can be easily drilled to the desired depth.

In addition, after the ground is excavated by the diameter (300 ~ 550mm) of the excavation blade on the outer peripheral surface of the movable portion has a consolidation of the surrounding ground by the injection of the injection material has the effect that can form a pile having a larger diameter in the ground.

In addition, according to the softness of the ground, the cement paste is pre-expanded through a second injection hole in a horizontal direction at an arbitrary depth, so that the diameter of the pile formed by the injection material consolidated through the first injection hole is kept the same. Since it is possible to increase the bearing capacity of the pile, there is an effect that can better withstand the vertical pressure and the shear force in the transverse direction by the ground.

1 is a cross-sectional view of a pile formed by a conventional drawing method.
Figure 2 is a front view of a first embodiment of a draw injection device of the present invention.
Figure 3 is a front view of a second embodiment of a draw injection device of the present invention.
4 is a cross-sectional view of an embodiment of a drawing injection method by the drawing injection device of FIG.
5 is a cross-sectional view of an embodiment of a drawing injection method by the drawing injection device of FIG.
6 is a cross-sectional view of a pile formed by a drawing injection method of the present invention.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the basic reinforcement expansion consolidation extraction apparatus and the basic reinforcement expansion consolidation extraction method using the same will be described in detail with reference to the accompanying drawings.

FIG. 2 is a front view of a first embodiment of a drawing injection apparatus of the present invention, FIG. 3 is a front view of a second embodiment of a drawing injection apparatus of the present invention, and FIG. 4 is an implementation of a drawing injection method using the drawing injection apparatus of FIG. 5 is a cross-sectional view of an embodiment of a drawing injection method by the drawing injection apparatus of FIG. 3, and FIG. 6 is a cross-sectional view of a concrete pile formed by the drawing injection method of the present invention.

Basic reinforcement expansion consolidation draw injection device of the present invention, as shown in Fig. 2, in the cylindrical shape of the injection passage 12 connected to the first inlet 12a of the lower end in the longitudinal direction therein, and the second injection port 14a of the outer peripheral surface A movable portion 10 having an auxiliary injection passage 14 connected to the bottom surface; The driving unit 20 provided above the movable unit 10 to rotate the movable unit 10 and having respective injection holes 22 and 24 communicating with the injection passage 12 and the auxiliary injection passage 14, respectively. ; And control means (not shown) for controlling the injection amount and the injection timing of the injection material injected through the injection holes 22 and 24 of the driving unit 20. .

2 (a) shows a first embodiment of the present invention, in which an excavation blade 16 is provided on the outer circumferential surface of the movable portion 10, and an auger 18 is provided on the lower end of the movable portion 10. As shown in FIG. The movable part 10 is formed in a cylindrical shape in the outer peripheral surface of the spiral excavation blade 16 is formed along the longitudinal direction of the movable part. Pitch or height of the excavation blade 16 can be implemented in various ways depending on the embodiment. An injection passage 12 is formed at the center portion in the longitudinal direction of the movable portion 10. The injection passage 12 communicates with the first inlet 12a formed at the bottom surface of the movable part 10. An auxiliary injection path 14 is formed around the injection path 12 to communicate with the second injection hole 14a formed on the outer circumferential surface of the movable part 10. At least one second injection port 14a is formed along the circumference of the movable part 10, and a plurality of second injection holes 14a may be radially formed to uniformly crush the surrounding ground at high pressure.

Since only the excavation blade 16 on the outer circumferential surface of the movable part 10 has difficulty in drilling vertically downward, an auger 18 is formed at the lower end of the movable part 10 for easy drilling of the ground. The auger 18 is formed in a plurality of radial, the size and the number of blades, etc. can be variously applied according to the embodiment.

A driving unit 20 for rotating the movable unit 10 is provided at the upper end of the movable unit 10. In the driving unit 20, injection ports 22 and 24 communicating with the injection path 12 and the auxiliary injection path 14 of the movable part 10 are respectively formed. The injection port 22 communicating with the injection path 12 is provided with a concrete high pressure pump (not shown) for supplying injection material, and the injection port 24 communicating with the auxiliary injection path 14 supplies a high pressure cement paste. A pump (not shown) is provided. In addition, an air inlet passage 26 for supplying high pressure air by an air pump (not shown) communicates with the inlet port 22 communicating with the injection passage 12 through the valve 26a. The method of raising or lowering the driving unit 20 or transmitting and rotating the driving unit 10 may use a known one widely used in a conventional construction machine.

2 (b) shows that a hammer 18a is provided at the lower end of the movable part 10 instead of the auger as another embodiment of the present invention. When the auger 18 is formed at the bottom of the movable part 10 as in the first embodiment, the perforation is easy in the case of general soil ground, but it is impossible to perforate when it meets a solid ground layer, that is, a rock layer, a gravel layer, or an amber stone layer. For this purpose, a hammer 18a is provided at the lower end of the movable part 10. When it meets the hard strata during the drilling of the ground, the hammer 18a is replaced with a movable part provided at the bottom, and the hammer 18a is raised upward by hydraulic, pneumatic or mechanical driving. As a result, the hard strata can be broken and perforated.

2 (c) shows another embodiment of the present invention in which a bit 18b having a drill-like shape is formed at the lower end of the movable part 10. In the case of the first and second embodiments as described above, when drilling to a deeper depth into the ground, the necessary configuration, the expansion of the perforated holes, the hard soil layer to the shallow depth, or the narrow or small Excavation blade 16, auger 18 or hammer 18a, etc. are not required during construction, so the excavation blade 16 on the outer circumferential surface of the movable part 10 is deleted, and the lower end of the movable part 10 is shaped like a drill blade. It is preferable to form a bit (18b). In a typical construction site, since excavation of various layers, it is preferable to replace the movable part so that the auger 18, the hammer 18a, or the movable part in which the bit is formed can be used to improve the efficiency.

Figure 3 is a second embodiment of the expansion consolidation injection device of the present invention. A difference from the first embodiment of FIG. 2 will be described. The drawing injection device (1) includes a movable part (10) having an injection path (12) connected to a first injection hole (12a) at the lower end in a cylindrical shape in a longitudinal direction therein; A driving part 20 provided on the movable part 10 to rotate the movable part 10 and having an injection hole 22 communicating with the injection path 12; And an injection tube inserted into the injection path 12 of the movable part 10 from the upper part of the driving part 20 and movable along the longitudinal direction of the movable part 10, and having a second injection hole 32 formed on an outer circumferential surface thereof. 30; Is done. The injection pipe 30 having a diameter smaller than the diameter of the injection passage 12 of the movable portion 10 is the length of the movable portion 10 into the injection passage 12 of the movable portion 10 through the upper portion of the drive unit 20. It is inserted along the direction. The injection pipe 30 has a second injection port 32 is formed on the lower outer peripheral surface of the tubular shape is closed one end. The injection pipe 30 is inserted into the injection passage 12 of the movable part 10 and is movable along the longitudinal direction of the movable part 10, and a separate injection pipe is further coupled to the upper end to change the length. Done. Excavator blade 16 for easy drilling of the ground is formed on the outer circumferential surface of the movable part 10, and an auger 18, a hammer 18a, or a bit 18b is formed at the bottom. The driving unit 20 is raised or lowered, or a method for rotating by transmitting a driving force to the movable portion 10 and the insertion method of the injection tube 30 is inserted into the driving portion 20 and the movable portion 10. The well-known thing widely used for a conventional construction machine etc. is used.

Control means (not shown) for controlling the injection amount and the injection timing of the injection material through the draw injection device as in the first and second embodiments of the above is further provided. The control means is an injection material injected through the first inlet 12a according to each layer based on the information on the information on each layer, the degree of rigidity and the order and thickness of each layer through geological irradiation The injection amount and the injection time of are controlled. In addition, the injection amount and the timing of the injection of the cement paste sprayed through the second injection holes (14a, 32) according to the amount of injection material injected through the first injection hole (12a) and the degree of rigidity of the ground layer is controlled. Of course, the control means is not limited to the configuration or structure in expressing the above functions.

With reference to FIG. 4, the expansion-consolidation consolidation injection method using the drawing injection apparatus of the structure as shown in FIG. 2 is demonstrated.

First, a geological survey is conducted to determine the composition of the strata to be subjected to the expansion consolidation injection method. Geological surveys generally use well-known methods. Geological surveys identify the composition of the ground, the height of each strata, and determine the depth and diameter of the pile to be constructed. In addition, information about each strata and information about the diameter and length of the movable part of the draw injection apparatus to be used are input to the control means. Once the construction plan is confirmed, the hole will be drilled in the ground. The movable part 10 of the lower part is rotated by the driving force of the driving part 20, the auger 18 of the lower part of the movable part 10 is rotated and punched, and the excavation blade 16 of the outer peripheral surface of the movable part 10 is formed. Due to the larger diameter can be perforated, the soil in the ground is discharged to the outside along the excavation blade (16) to prevent jamming (jamming) to facilitate the perforation. When drilling meets a solid middle amber stone layer, the hole is made by replacing with a movable part 10 provided with a hammer (18a) at the bottom. Since the perforated hole is formed to be the same as the diameter of the excavation blade 16 of the movable portion 10, the pressure of the injection material to be consolidated is continuously maintained, thereby easily consolidating the surrounding ground. In the opening of the hole by the rotation of the movable part 10, the valve 26a is selectively opened and closed, and the high pressure air is supplied to the first inlet 12a through the injection path 12 by an air pump, so that the drilling is performed. It is good to make it easy. In addition, after the end of the drilling before the injection of the injection material is supplied in advance through the air injection path 26 to remove the soil introduced into the injection path 12 through the first injection hole 12a during the drilling of the ground It is preferable to make the injection of the injection material easier. In addition, after the injection of all the injection material is completed, it is possible to remove the remaining injection material, it is possible to clean the injection path 12 by injecting a cleaning agent or water through the air injection path (26).

When the drilling to the planned depth is completed, the concrete high pressure pump is operated by the control means and the injection material is injected through the injection port 22 of the drive unit 20. The injection material is basically composed of cement and water, and the ground condition, the purpose of reinforcing the ground (when the main purpose is high strength and uniform strength, when forming a uniform composite ground with low strength, the purpose of high strength and dense order in seawater) In the case of cavity injection of injection material with low strength and high slump value, for reinforcement purpose considering other structure characteristics), structure characteristics, ease of acquisition of injection material on site or material cost, etc. At least one or more of lime powder, sand, fine grain, lime (quick lime, slaked lime) or fly ash may be suitably used for the purpose, but is not limited thereto and is generally used in construction. Of course reinforcement can also be used.

Therefore, the injection material used in the expansion consolidation injection device of the present invention is cement + sand + stone powder + water, cement + sand + fine soil (clay, general soil) + water, cement + stone powder + fine soil (clay, general soil) + water, Various injection materials such as cement + lime powder + sand + fine soil (clay, general soil) + water or cement + fine grain soil + lime (quick lime, calcined lime) + water can be mixed and used in proportion. Not only can there be any civil ground reinforcement that can be used as an injection material, but also the combination and ratio between them can be applied to a wide range of applications depending on the conditions such as strength, injectability, or the relationship with the ground by pre-mixing tests. . That is, when the material is described in detail, a combination of the injection materials considering the ground conditions, reinforcement purpose, structure characteristics, material acquisition at the site (regional characteristics), and material cost may be applied according to various conditions as follows.

In case of reinforcement purpose of pile function in the ground where high strength compressive force and shear force are required, injection material containing sand + stone powder (fine soil exclusion) + cement + water is used.

For the purpose of reinforcing the formation of a composite ground of strength similar to the surrounding ground by promoting consolidation and dewatering drainage on the soft viscous soil, an injection material containing cement + lime + water or cement + lime + soil (grain) + water is used.

For the prevention of slope activity, an injection material containing sand + stone powder + cement + water is used for reinforcement purposes requiring high strength.

In case of high-strength expression in order to reinforce the sandstone layer with flow velocity, injection material containing sand + stone powder + cement + water + coarse powder + bentonite + admixture (low slump) is used. Soil, cement, water, crude, bentonite, admixture (low slump) are used.

For reinforcement purposes where there is no groundwater level and horizontal cavity filling and strength are not required, an injection material containing cement + soil (fine soil) + water (high slump) is used, and the reinforcement is partially reinforced to the inclined cavity. If strength is not required, use a mix of cement + soil (fine soil) + water (low slump).

For joint reinforcement with groundwater levels, a mix of cement + soil (fine-grained soil) + water (low slump) is used.

When reinforcing the struts in the abandoned mine cavity, an injection material containing cement + sand + stone powder + water + (high strength agent) (low slump) is used.

In consideration of the characteristics of the structure, the lateral flow is prevented, and when it functions as a pile, the soil is large in size due to the injection, which prevents the flow as a pile of small diameter and high strength.In this case, cement + stone powder + sand + water is mixed. Use prepared fillers.

If it is not easy to acquire fine grains at the construction site, stone powder is used instead of fine grains. For example, in the case of deserts, it is impossible to obtain fine grains. In Korea, Pohang is also difficult to obtain fine grains. Sand or stone powder is used instead of fine grains. However, since the friction in the injection tube is increased due to the injection material, it is preferable to mix the fly ash or other admixture to facilitate the injection.

In addition, it is a matter of course that at least one or more of the admixture for changing the properties of the injection material and the index characteristic agent for facilitating the order can be used in the injection material. In the above, the admixture is a component material added in addition to water, cement, and aggregate to improve the hardening and workability (casting) of concrete. The amount of the admixture is used so that it does not affect the calculation of the volume of concrete. Is used. The types of curing accelerators, curing retardants, waterproofing agents, expansion agents, foaming agents, coloring agents, high strength agents, and roughening agents are widely used in the construction field, and various materials can be used as admixtures. The high strength agent is a subsidiary material which is added and used for the purpose of enhancing the strength of concrete, and the roughening agent is a blast furnace slag fine powder or the like as a material used to express strength early. The index characteristic agent is a material for the purpose of hastily ordering or for the material used after the order to exhibit a long-term ordering function. As a fastener, water glass has bentonite, other quickening, Terminated and finished materials are added and used.

As described above, the ground reinforcing material may be used as an injection material by combining any one or more of the respective materials by examining all conditions in advance to be suitable for the ground reinforcing purpose, and is not necessarily limited thereto. However, it is preferable to mix and use an optimal injection material in advance by setting an injection compounding ratio according to the ground in advance.

At this time, if the ground compaction is the main purpose, the injection material is to use a high viscosity injection material (slump value of less than 7cm) with a small slump value, it is preferable to facilitate the consolidation of the surrounding ground. High pressure concrete (70kg / cm ²⁾ Since the injection material is supplied to the injection path 12 through the injection hole 22, a strong pressure is applied to the injection material to be injected, and the injection material is injected through the first injection hole 12a at the bottom of the movable part 10, and then into the surrounding ground. Pressure is applied to consolidate the ground and injected into the design diameter. As the injection material injected through the first inlet 12a is filled with high pressure from the lower end of the drilled hole, the driving unit 20 is gradually raised upward by the control means, and the injection material is moved from the lower end of the drilled hole to the surrounding ground. It will be compacted and filled.

However, when the injection material is injected at a high pressure through the first inlet 12a as described above, the diameter of the ground is consolidated and expanded according to the rigidity of the ground layer, so that the diameter of the pile 2 formed by solidifying the injection material Depending on this strata, it becomes vulnerable to shearing force and causes a problem of losing its ability as a foundation.

Therefore, it is possible to determine the diameter expanded through the control means in accordance with the difference in the amount of injection at a specific depth during the injection of the injection material through the hard stratum and the first injection hole 12a previously identified during the hole drilling. When the second injection hole 14a of the movable part 10 passes through the strata where the expansion to the desired diameter is not made, the control means detects this and operates a supply pump (not shown) to inject the injection part of the driving part 20. Inject the cement paste (cement paste) mixed with cement and water through the high pressure (200 ~ 400kg / cm ² ) through (24). The injected cement paste is sprayed at a high pressure radially along the longitudinal direction and the vertical direction of the movable part 10 by the driving of a supply pump (not shown), and the solid surrounding ground is crushed to expand the builder to a desired diameter. As described above, the expansion using the cement paste is performed during the drilling of the hole due to the rotation of the movable part 10 as shown in FIG. 4 (a) as the supply pump is operated by the control means based on the information on the hard strata through the geological irradiation. It may be made, and may be made during the process of moving the movable portion 10 to the upper side while injecting the injection material into the punched hole after the completion of the hole as shown in Figure 4 (b).

As the solid layer is pre-expanded to a desired diameter by the high-pressure injection of cement paste before injection of the injection material as described above, the surrounding ground is consolidated and expanded according to the pressure of the injection material injected through the first inlet 12a. The file has the same diameter from the bottom to the top because it can be maintained by the injection material injected through the first inlet 12a while passing through the strata formed by high-pressure injection of cement paste in advance. (2) can be formed.

Under the control of the control means, the ground near the ground is expanded to the desired diameter by the high pressure spraying of cement paste through the second injection hole 14a, and the injection material is pressurized by the concrete high pressure pump near the ground to complete the injection. do. At this time, injection to the upper end of the surface is completed through the first inlet 12a, and cement paste is injected into the non-injection section near the ground through the second injection hole 14a, thereby having a pile having a finishing surface having the same height as the ground surface (2). ) Can be formed and it is effective to prevent the elevation of the surrounding ground.

After the injection operation is completed, the injection material remaining in the injection path 12 can be removed by injecting air into the injection path 12 through the air inlet path 26, so that the injection material is injected into the injection path ( 12) It is effective to prevent hardening inside.

The basic reinforcement expansion consolidation extraction method using the expansion consolidation injection apparatus of Figure 3 will be described with reference to FIG. Like the drawing injection method of the first embodiment, the geological survey and the perforation are made in the same way. Geological surveys identify the composition of the ground, the height of each strata, and determine the depth and diameter of the pile to be constructed. In addition, information about each strata and information about the diameter and length of the movable part of the draw injection apparatus to be used are input to the control means. When the drilling to the planned depth is completed, the concrete high pressure pump is operated by the control means, the injection material injected into the injection port 22 of the drive unit 20 passes through the injection path 12 to the first bottom of the movable part 10. Injection is made to the injection hole 12a. As the injection material is consolidated at a high pressure (70 kg / cm ² ) into the hole drilled through the first injection hole 12a, the voids in the surrounding ground are reduced and expanded. It gradually rises and continuously consolidates the injection material. At this time, the injection pipe 30 inserted into the injection passage 12 of the movable part 10 is maintained in a state where the lower end contacts the lower end of the perforated hole. To this end, when the drawing injection device 1 is raised to an appropriate height, the injection pipe 30 is connected to the upper portion of the injection pipe 30 by the injection pipe 30 to the injection path 12 of the movable part 10. It is possible to inject the injection material into the inserted state. The injection pipe 30 is further coupled to the upper end of the injection pipe 30 by the injection pipe 30 is maintained in the drawing injection device 1 when the injection of the injection material is completed, the injection pipe near the surface 30 is cut and then coupled to the drawer 40. The drawing machine uses a known one widely used in construction sites. A supply pump (not shown) is coupled to the end of the injection pipe 30 and the drawer 40 is operated by the control means to raise the injection pipe 30. When the spray pipe 30 has reached the ground which is not fully expanded, the supply pump is operated by the control means, and the cement of the high pressure (200-400 kg / cm ² ) is passed through the second injection hole 32. Cement paste is high-pressure sprayed into the surrounding ground to expand the surrounding ground to the same diameter as the diameter expanded by the consolidation injection of the injection material in the process. By the above process, it is possible to expand the rigid ground layer by high-pressure injection of the cement paste through the second injection port 32 on the outer circumferential surface of the injection pipe 30.

In the case of the hard strata which are not expanded only by the consolidation injection of the injection material by the above process, due to the fracture of the surrounding ground by the high pressure injection of cement paste, it can be expanded to the same diameter as the diameter of the ground expanded by the consolidation injection of the injection material. Therefore, it is possible to form piles 2 having upper and lower portions having the same diameter in the ground.

Since the compressive strength of the injection material is determined according to the type of cement and the mixing ratio of water and cement, the ratio of the water and cement of the cement paste sprayed by the high pressure injection through the second injection hole 32 and the ratio of the injection material pre-consolidated By doing the same, the compressive strength of the pile 2 formed in the ground can be kept the same.

As described above, according to the injection of the injection material through the first injection hole 12a and the high pressure injection of the cement paste through the second injection holes 14a and 32, the pile 2 having a constant diameter can be formed in the ground as shown in FIG. Since the surrounding ground is consolidated during the formation of the pile, there is an effect of improving the ground. Therefore, there is an effect that the pile can be formed in the improved ground to provide a firmer foundation.

In addition, it is possible to expand at a specific depth by the high pressure injection of the cement paste through the second injection holes 14a and 32 by the control means, so that the soft ground layer having weak bearing capacity is expanded to a larger diameter through the high pressure injection of the cement paste. It is possible to improve the bearing capacity of the pile formed in the ground by injecting the injection material after making it.

Expansion expansion consolidation injection method as described above is for the purpose of reinforcing the lower ground foundations of the breakwater or the foundation of the mound foundation, preventing the settlement of the soft ground by the sedimentation or the loading of the rock, the foundation of the structure, the ground by the soil body Of course, it can be widely used for the prevention of flow, extensive soft ground reinforcement, oscillation reinforcement, and ground reinforcement by filling the cavity or lime cave underground cavity.

The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not satisfy all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be variations and variations.

1: drawing device 2: file
10: moving part 12: by injection
12a: first inlet 14: auxiliary injection furnace
14a: 2nd injection hole 16: Excavation wing
18: Auger 18a: Hammer
18b: bits
20: drive part 22, 24: injection hole
26: air inlet
30: injection pipe 32: second injection port
40: drawing machine

Claims (4)

As the basic reinforcement expansion consolidation drawing injection method using the basic reinforcement expansion consolidation drawing injection device,
a) conducting a geological survey to identify the geological layer of the ground to be subjected to the expansion consolidation injection method;
b) drilling the ground to a predetermined depth from the ground surface as the movable unit 10 is rotated by the driving unit 20 on the ground after the geological survey;
c) the concrete high pressure pump is operated by the control means so that the injection material injected through the injection port 22 of the driving unit 20 passes through the injection path 12 to the first injection hole 12a at the bottom of the movable part 10. Discharged;
d) The injection pipe 30 inserted into the injection passage 12 of the movable part 10 is continuously fixed as the movable part 10 rises from the lower end of the perforated hole to the surface in the fixed state. The injection material is injected through 12a to fill the perforated hole and the surrounding ground is consolidated;
e) When the movable part 10 rises to the surface and the injection of the injection material is completed, the injection pipe 30 inserted through the injection path 12 of the movable part 10 is cut near the ground and fixed to the extractor 40. Becoming; And
f) The injection pipe 30 is lifted by the driving of the drawer 40, and the second injection port 32 of the injection pipe 30 passes selectively by the control means. Cement paste is injected into the surrounding ground through the injection hole 32;
Basic reinforcement expansion consolidation pull-out injection method comprising a. The method of claim 1,
In the step d), as the movable part 10 rises to the surface, a separate injection tube is further coupled to the upper end of the injection pipe 30 inserted into the injection path 12 of the movable part 10 to the movable part ( The method of claim 1, wherein the injection pipe 30 is inserted into the injection passage 12 of the movable part 10 even when 10 is raised to the surface. The method of claim 2,
The injection material includes cement and water, and basic reinforcement expansion consolidation injection method, characterized in that it further comprises any one or more of lime, sand, fine grain, lime or fly ash (fly ash). The method of claim 3, wherein
And the injection material further comprises any one or more of an admixture for changing the properties of the injection material and an index characteristic agent for facilitating the order.

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