KR100938407B1 - About the cavity where the underground water flows the cavity charging method which is environmental-friendly - Google Patents

Abstract

PURPOSE: A cavity filling method is provided to prevent the discharge of a cement component mixed with a second injection material by prefilled first injection material to the outside, to reduce waste of the injection material, and to form rhizome with uniform strength. CONSTITUTION: A cavity filling method for a cavity layer with the flow of subsurface water comprises the steps of: forming a punched hole(2) from the ground to underground capavity(10) using drilling equipment with an excavating bit; inserting a lot connected to an injector of the ground into a punched hole; separately preparing the first injection material(11) which is not mixed with cement and the second injection material(12) which is mixed with cement; reinserting the lot into the punched hole filled with the first injection material; and forming rhizome by injecting the second injection material through the lot.

Description

About the cavity where the underground water flows the cavity charging method which is environmental-friendly}

The present invention relates to an environmentally friendly co-filling method for a cavity layer having a flow of groundwater,

More specifically, the existing high pressure spraying method is used to prevent water pollution due to material leakage that may occur when filling the cavity for the purpose of enhancing the strength of the foundation of the structure in areas where the cavity is widely developed. Unlike the injection equipment, a low slump (3 ~ 5cm) material containing clay, fine bone, and cement is injected at the injection pressure of 10 ~ 70kgf / ㎠ using the injection equipment. Is prepared by mixing the secondary injection material containing the first, and the primary injection material is first injected into the cavity and filled, and then the secondary injection material is injected into the pre-filled primary injection material. By preventing the cement component blended into the secondary injection material from leaking to the outside, water pollution in the surrounding area is prevented and the injection material is prevented by preventing waste of the injection material. Also to savings, as well as

The present invention relates to an environmentally friendly cavity filling method for a hollow layer with a flow of groundwater, through which the strength of the bulb formed and the consolidation effect of the surrounding ground into which the injection material is injected are made.

In areas where underground cavities are developed, there is a high possibility of ground subsidence. Once ground subsidence occurs, groundwater and soil pollution, and damage to or collapse of roads, railroads, bridges, tunnels, and other buildings, etc. It can cause valuable personal injury and enormous property damage.

In general, to prevent uneven settlement of buildings or various structures constructed on the soft ground, cement-based grout material is injected at high pressure into the ground of the settlement occurrence position to recover the structure or improve the strength of the foundation foundation. Compact grouting methods are widely used.

However, the conventional grouting method is simply injecting cement-based grout material at high pressure so that when the foundation ground reinforcement is performed in an area where underground cavities are widely distributed, the injected material injected to fill the cavity is Rather, the risk of water loss in the surrounding area due to loss through the cavity was very high.

In addition, it is difficult to form a bulb having an even and uniform strength because the injection material is excessively used and wasteful, but there are many lost parts of the injection material.

Therefore, there is a real need for a method for solving such a problem.

The present invention has been made to solve the above problems,

The injection material is manufactured separately from the primary injection material without cement and the secondary injection material with cement, and the primary injection material and the secondary injection material are 10 ~ 70kgf / ㎠ unlike the high pressure injection method. The injection pressure is injected using the injection equipment, but the primary injection material is first injected into the cavity, followed by the step of filling the secondary injection material, followed by the second injection by the pre-filled primary injection material. As well as preventing the cement component blended into the material from leaking to the outside and preventing waste of the injected material,

An eco-friendly cavity filling method for a common layer of groundwater flow, which allows the formation of bulbs with even and uniform strength, and the strength of the foundation ground through the consolidation effect of the surrounding ground into which the injection material is injected. The purpose is to provide.

In order to achieve the above object, the eco-friendly joint filling method for a hollow layer having a flow of groundwater of the present invention basically drills a selected drilling position using a drilling equipment (1) equipped with an excavation bit from the ground. Forming a drilling hole leading to the cavity;

(B) inserting a rod connected to the injector of the ground into the perforated hole, but placing the lowermost end of the rod to the bottom of the underground cavity;

(C) separating and preparing the injection material into a primary injection material containing no cement and a secondary injection material containing cement;

(D) filling the cavity by injecting the primary injection material without cement into the rod through the rod while drawing the rod;

(E) inserting the rod into the drilling hole filled with the primary injection material not containing the cement, but placing the lowermost end of the rod to the bottom of the underground cavity;

And a step of forming a bulb while drawing the reinserted rod and injecting a secondary injection material incorporating cement through the rod to prevent the cement component from being discharged by the primary injection material. It is.

The eco-friendly joint filling method for the common layer with the flow of groundwater of the present invention is particularly grouting by drilling a hole in the place where the limestone cavity is developed in the horizontal and vertical directions, where water pollution of surrounding areas is concerned. The system (equipment) is used to fill the cavity by injecting the primary injection material without cement in the first step, and then injecting the secondary injection material with cement in the second step. Cement component blended into the tea injection material does not leak to the outside.

Therefore, there is no pollution of the surrounding water quality and prevents waste of the secondary injection material.

In addition, a bulb having a uniform and uniform strength is formed, and the strength of the foundation foundation is increased through the consolidation effect of the surrounding ground into which the injection material is injected.

Meanwhile, during the implementation of the present invention, a reinforcing material, such as reinforcing bars or beams, is further added to the outside of the rod in the step of injecting the primary injection material without cement or the secondary injection material with cement. After inserting and further performing the step of blocking the perforation hole with a support plate to prevent the reinforcement from escaping upward when the injection material is injected,

Reinforcement such as reinforcing bars or beams is further formed integrally inside the bulb formed as a final result, so that the strength of the bulb is doubled, thereby further increasing the strength of the foundation of the structure.

Eco-friendly joint filling method for the cavity layer with the flow of the groundwater of the present invention by drilling the selected drilling position using the drilling equipment (1) equipped with a drill bit basically as shown in Figure 1a from the ground cavity ( Forming a drilling hole 2 leading to 10),

Inserting a rod (3) connected to the injector of the ground into the drilled hole (2) as shown in Figure 1b, but placing the lower end of the rod (3) to the bottom of the underground cavity (10),

(C) separately separating the injection material into the primary injection material (11) without cement and the secondary injection material (12) with cement as shown in FIG. 1C, and

(D) filling the cavity by injecting the primary injection material 11 in which cement is not blended through the rod 3 while drawing the rod 3 as shown in FIG.

As shown in FIG. 1E, the rod 3 is reinserted into the drilling hole 2 filled with the primary injection material 11 without cement, but the bottom end of the rod 3 is located at the bottom of the underground cavity 10. Positioning to (E),

As shown in FIG. 1F, the secondary injection material 12 incorporating cement is injected through the rod 3 while the rod 3 is reinserted, and the cement component is separated by the primary injection material 11. And a step (F) of forming a bulb as shown in FIG. 2 without being discharged.

Here, the present invention comprises the step of injecting the primary injection material 11 and the secondary injection material 12 through the rod 3 while drawing the rod (3) inserted into the drilling hole (2) Injecting material for each hole, as shown in FIGS. 3A to 3B, first, an injection is performed to the perforated hole 2 formed on the outer side, and then gradually to the inner perforated hole 2.

On the other hand, the present invention is a step (D) of injecting the primary injection material (11), the cement is not blended as shown in Figures 4a to 4b of the accompanying drawings or the secondary injection material (12) incorporating the cement In the step before the step of injecting (F), the reinforcing material 20 such as reinforcing bars or beams is further inserted into the perforation hole 2 to the outside of the rod 3, and the reinforcing material 20 falls out when the injection material is injected. A step (G) of blocking the perforation hole 2 by the support plate 21 may be further performed so that it does not come out.

Hereinafter, the present invention will be described in detail based on one embodiment.

In particular, the present invention relates to a material and an injection method using the same when the cavity is developed in the horizontal and vertical directions and is concerned about water pollution in the surrounding area when the ground is reinforced.

Using the drilling equipment 1 equipped with an excavation bit, drilling is carried out to the injection depth of the injection position to form the drilling hole 2, and then, in some cases, the PVC pipe can be embedded by preventing the collapse of the hollow walls. Can also be.

The injection material is divided into the primary injection material 11 without cement and the secondary injection material 12 with cement, and the primary injection material 11 is filled into the cavity 10 and injected secondly. In order to prevent the loss of the secondary injection material 12, the clay, fine aggregate, and underwater inseparable admixtures are mixed with water to produce a slump of 3 ~ 5 cm and the mixing ratio is as shown in the table below.

Primary injection material Aggregate (less than 10mm) Clay (less than 4mm) Underwater fire separation admixture water  0.5㎥ per 1㎥  0.5㎥ per 1㎥  0.1% by weight per 100% by weight of clay used  0.2㎥ per 1㎥

In the secondary injection material, cement is added to the primary injection material in order to develop the strength of the bulb, and the amount of the in-water incompatibility admixture to prevent the escape of the cement is slightly increased.

The compounding slump is 3-5 and the compounding ratio is as follows.

2nd injection material cement Aggregate (less than 10mm) Clay (less than 4mm) Underwater fire separation admixture water  200 kg  0.5㎥ per 1㎥  0.5㎥ per 1㎥  0.6% by weight per 100% by weight of clay used  0.2㎥ per 1㎥

Then, the injection rod 3 is injected to the bottom depth of the bulb in order to inject the material. (The steel pipe rod provided on the upper side of the excavation bit is drilled into the bottom depth of the bulb in the drilling bit so that the steel pipe rod plays the role of the injection tube. May be used)

The injection amount is calculated as 0.007 m 3 per stroke of the discharge pump and is calculated by recording the number of strokes per meter.

Injection of the injection material in the present invention is injected through the rod (3) along the hose connected to the discharge pump, it is an upward injection method to draw and inject the rod (3) in accordance with the injection pressure or injection amount.

As the drawing height is 33cm, drawing operation is operated by hydraulic jockey and the length of one rod (3) is 1m, so the rod (3) is removed once when drawing three times.

Primary injection using the primary injection material 11 is carried out for the purpose of injection of the cavity 10 and the injection pressure is usually carried out in the range of 15 ~ 30kgf / ㎠.

Here, if the injection pressure is too low, the filling state of the cavity 10 will be poor, and if the injection pressure is excessive, the secondary injection will not be smooth afterwards. Observe carefully and inject.

Secondary injection using the secondary injection material 12 is carried out in a state where the primary injection material 11 is sufficiently filled with the cavity, the injection pressure is injected in the range of 15 ~ 70kgf / ㎠ according to the stratum state.

In this case, the injection amount is calculated based on the design bulb diameter. For example, in the case of a bulb having a diameter of 2m, the injection amount per 1m is 2 × 2 × 3.14 / 4 = 3.14m 3.

However, since the injection amount is fluid according to the state of the formation of the strata, it should be used as a reference for the secondary injection amount.If the injection is excessive due to the formation of the strata, the injection is stopped at the discretion of the technician, and the upper part is drawn by drawing the rod 3. Is carried out.

Injecting order, that is, by drilling the rod 3 inserted into the drilling hole (2) by the injection through the rod 3, the primary injection material 11 and the secondary injection material 12 including the step of injecting Injection material injection order is to inject the first and second injections into the outer periphery of the structure first, and then construct the remaining inner sections, that is, first, the injection holes are formed in the outer perforations (2) and gradually into the inner perforation holes (2). In this way, the injection material injected into the outer perforation hole 2 acts as a protective film, thereby preventing the loss of the injection material injected into the inner perforation hole 2, thereby preventing excessive injection of the injection material. .

Example 1 is an experimental example to which the present invention is applied and is an example of application in a typical limestone cavity area in which underground cavities are developed in a vertical or horizontal direction.

-Strata conditions: Large and reticulated cavities develop under 10 ~ 70m deep below the structure (Horizontal and vertical cavities mixed)

-Construction condition: The foundation of the bridge's alternating structure, the pile foundation type of 10m depth, the bulb formation plan from the pile tip to 9.8m depth.

-Slump value of injection material: 3 ~ 5cm.

Target intensity of bulb: 50kgf / ㎠

Bulb design diameter: 2,000 mm

Injection pressure: Injection pressure of primary injection material = 15 ~ 30kgf / ㎠, Injection pressure of secondary injection material = 15 ~ 70kgf / ㎠ (Flexible according to the distribution of cavity)

-1st stage grout (bulb formation) height ㎠: 1m (3 times of drawing at 33cm per step)

-Measurement of water quality during construction: Measurement of temperature and pH of nearby rivers at least once a day

As a result of the test, no change in pH of nearby rivers was observed, and the compressive strength of bulb cores collected through drilling survey was measured to be 65kgf / ㎠ or more, which was more than the design reference strength (50kgf / ㎠).

As described above, the eco-friendly cavity filling method for the cavity layer with the flow of groundwater of the present invention is particularly suitable for the place where the limestone cavity is developed in the horizontal and vertical directions, where water pollution in the surrounding area is concerned when the ground is reinforced. Secondary injection material (12) after cement injection is filled with cavity (10) by primary injection of primary injection material (11) that is not formulated with cement using conventional grouting system (equipment). Since the step of injecting the cement component formulated in the secondary injection material 12 by the primary injection material 11 is not leaked to the outside.

Therefore, there is no contamination of the surrounding water quality and prevents waste of the secondary injection material 12.

In addition, a bulb having a uniform and uniform strength is formed, and the strength of the foundation foundation is increased through the consolidation effect of the surrounding ground into which the injection material is injected.

On the other hand, as shown in Figures 4a to 4b during the execution of the present invention, the first injection material (11) that is not compounded with cement or the second injection material (12) with the cement compounded in the rod (3) ) The reinforcing material 20 such as reinforcing bars or beams is further inserted into the drilling hole 2, and then the drilling hole 2 is supported by the support plate 21 so that the reinforcing material 20 does not escape upward when the injection material is injected. If you take more steps,

Since the reinforcement 20 such as reinforcing bars or beams is further formed integrally inside the bulb formed as a final result, the strength of the bulb is doubled.

Therefore, if the building is inclined to the original state as shown in FIG. 6, the building can be supported even more robustly and stably.

Figure 1a, Figure 1f is a step-by-step construction sequence diagram of the present invention,

Figure 2 is a structural diagram of the bulb constructed by the present invention.

Figure 3a, Figure 3b is a flow chart of the injection material as the present invention.

4a to 4b is a state diagram inserted into the reinforcement during construction of the present invention,

Figure 4a is a state in which the reinforcing material is inserted before the step (D) of injecting the cement-primary injection material.

Figure 4b is a state in which the reinforcing material is inserted before the step (F) of injecting cement-containing secondary injection material.

5 is a structural diagram of a bulb completed in the state where the reinforcement is inserted as the present invention.

Figure 6 is a state diagram restored to the original building inclined to the present invention.

♣ Explanation of symbols for the main parts of the drawing

1: drilling equipment 2: drilling hole

3: injection rod 10: joint

11: primary injection material 12: secondary injection material

20: reinforcing material 21: support plate

Claims (7)

(A) forming a drilling hole (2) from the ground to the underground cavity (10) by drilling the selected drilling position using the drilling equipment (1) equipped with the drilling bit; Inserting a rod (3) connected to the injector of the ground into the perforated hole (2), but placing the lower end of the rod (3) to the bottom of the underground cavity (10); (C) separately preparing and preparing the injection material into the primary injection material (11) without cement and the secondary injection material (12) with cement; (D) filling the cavity by injecting the primary injection material 11 in which cement is not blended through the rod 3 while drawing the rod 3; Reinserting the rod (3) into the drilled hole (2) filled with the primary injection material (11) that is not cemented, but placing the lower end of the rod (3) to the bottom of the underground cavity (10) (E) Wow, While drawing the reinserted rod 3, the secondary injection material 12 containing cement is injected through the rod 3 to form a bulb while preventing the cement component from being discharged by the primary injection material 11. Eco-friendly joint filling method for a common layer with a flow of groundwater, characterized in that it comprises a step (F). The method of claim 1, Step (B) which is a step prior to performing the step (D) of injecting the primary injection material 11 in which the injection material is not compounded or the secondary injection material incorporating cement (F) or In step (E), the reinforcing material 20, such as reinforcing bars or beams, is further inserted into the perforation hole 2 outside the rod 3, and then the support plate 21 is prevented from reinforcing the reinforcing material 20 when the injection material is injected. Eco-friendly joint filling method for the cavity layer with a flow of groundwater, characterized in that to further perform the step (G) of blocking the perforation hole (2). The method of claim 2, In the step (G), the reinforcing material 20, such as reinforcing bars or beams, which are put into the outside of the rod 3, is individually inputted individually, or is integrally bound and input using a binding material such as wire or wire. Eco-friendly joint filling method for common layers with groundwater flow. The method of claim 1, The primary injection material 11 manufactured in step (C) of separately preparing the injection material into the primary injection material 11 in which the cement is not blended and the secondary injection material 12 in which the cement is blended is provided. Aggregates 0.4 ~ 0.6㎥ with aggregates of 10 mm or less per cubic meter, 0.4 to 0.6㎥ of clay with particles of 4 mm or less per cubic meter, 0.05 ~ 0.15% by weight of fire-dissolving admixtures per 100% by weight of the clay used, Eco-friendly joint filling method for the cavity layer with groundwater flow, which is manufactured by mixing 0.15 ~ 0.25 ㎥ of water per 1㎥. The method of claim 1, The secondary injection material 12 manufactured in step (C) of separately preparing the injection material into the primary injection material 11, which is not cement blended and the secondary injection material 12, which is cement blended, With cement 200 ~ 280Kg, Aggregates 0.4 ~ 0.6㎥ with aggregates of 10 mm or less per cubic meter, 0.4 to 0.6㎥ of clay with particles of 4 mm or less per cubic meter, 0.5 to 1.0% by weight of fire-dissolving admixtures per 100% by weight of the clay used, Eco-friendly joint filling method for the cavity layer with the flow of groundwater, which is manufactured by mixing 0.15 to 0.25㎥ of water per 1㎥. The method of claim 1, Step (D) of injecting the primary injection material (11) that is not cement blended through the rod (3) while drawing the rod (3) inserted into the drilling hole (2) and the secondary injection material compounded cement Injecting step (12) (F), wherein the primary injection material 11 is subjected to a constant pressure injection, the secondary injection material is characterized in that the quantitative injection is carried out in the common layer with the flow of groundwater Eco-friendly joint filling method. The method of claim 1, Each step (D) (F) of injecting the primary injection material 11 and the secondary injection material 12 through the rod (3) while drawing the rod (3) inserted into the drilling hole (2) Injection material injection order for each drill hole, Eco-friendly joint filling method for the cavity layer with the flow of groundwater, characterized in that the first injection is carried out to the hole (2) formed on the outside and gradually into the inner hole (2).

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