KR20090101139A - Grouting steel pipe with holes disposed spirally and grouting method using the same - Google Patents

Abstract

PURPOSE: A grouting steel pipe with spirally arranged injection holes and a grouting method using the same are provided to enhance anchorage of steel pipes on the ground by dispersing and filling grouting solution between the ground and the steel pipes. CONSTITUTION: A grouting steel pipe comprises first through fourth injection hole lines(110,120,130,140) in which injection holes(H1,H2,H3,H4) are arranged on the same oblique line. The angle(θ) of the oblique line satisfies 0<tanθ<b/a, where a is the horizontal distance and b is the vertical distance between adjacent lines in the case that each injection hole line is perpendicularly arranged to the steel pipe cross-section.

Description

Grouting steel pipe for ground reinforcement with spiral injection hole and steel pipe grouting method using same {Grouting steel pipe with holes disposed spirally and grouting method using the same}

The present invention relates to a ground reinforcing grouting steel pipe with a spiral injection hole and a steel pipe grouting method using the same, and more particularly, a plurality of injection holes are formed to be installed in the ground and then injected with grouting liquid to reinforce the ground. It relates to a ground reinforcing grouting steel pipe configured as a grouting steel pipe so that the injection port is arranged spirally along the steel pipe circumference, and a steel pipe grouting method using the same.

The steel pipe grouting method is a method to enhance the order while reinforcing the ground. If the grouting liquid is injected into the steel pipe after the steel pipe with many injection holes are installed in the ground, the grouting liquid is forced out through the injection hole and the gap between the ground and the steel pipe As the steel pipe and the ground are integrated by the solidification of the grouting liquid filled while being filled in, the reinforcement strength of the steel pipe is exerted, and the shear strength of the ground is increased. Such a steel pipe grouting method has been widely used as a part of the tunnel reinforcing method in recognition of its effect.

1 is a view showing a conventional steel pipe applied to the steel pipe grouting method, as shown in the conventional grouting steel pipe is formed in the same row, the same row of horizontal and vertical with respect to the cross section of the steel pipe as shown. That is, only four rows of injection holes are formed on the developed view. Steel pipe is inevitable due to the formation of the injection hole strength loss is inevitable, if the injection hole is formed in the same row, the same column as the conventional steel pipe, the row or column formed with the injection hole is bound to be weak compared to other parts. Thus, the conventional steel pipe is easily deformed in the row and column in which the injection hole is formed even in a relatively small external force, such deformation of the steel pipe leads to a problem of lowering the reinforcement strength of the steel pipe when the steel pipe is installed in the ground.

In addition, the conventional steel pipe is formed while the injection holes are arranged in the same row and column in the horizontal and vertical, even if the grouting liquid is injected through the injection hole is filled only around the injection hole is formed there is a problem that is not evenly filled.

The present invention has been proposed to improve the above-described prior art, and has the following technical objects.

First, the present invention, when a plurality of injection holes are formed and installed in the ground and injected with grouting liquid when the force is applied vertically or horizontally by the steel pipe of a certain cross-section integrated into the ground and the injection port is arranged spirally along the steel pipe circumference It is a technical object to provide a ground reinforcing grouting steel pipe which minimizes the strength loss by the inlet.

Secondly, an object of the present invention is to provide a ground reinforcing grouting steel pipe and a steel pipe grouting method using the same, which induce a dispersion effect of the grouting liquid to improve fixation force on the ground as well as increase resistance to external force.

In order to achieve the above object, the present invention is a grouting steel pipe (P) is formed as a plurality of inlets (H1, H2, H3, H4) is formed in the ground after the injection of grouting liquid is injected into the inlet as a steel pipe of a certain cross-section It provides a ground reinforcing grouting steel pipe, characterized in that (H1, H2, H3, H4) is arranged spirally along the steel pipe circumference.

In addition, the present invention (a) the step of installing the ground injection reinforcing ground grouting steel pipe (P) in which the inlet is spirally installed; (b) injecting the grouting solution into the ground reinforcing grouting steel pipe (P) in which the injection hole is spirally provided, and provides a steel pipe grouting method comprising a.

According to the present invention, the following effects are expected.

First, the injection hole formed in the steel pipe is configured to be arranged in a spiral along the steel pipe circumference to minimize the strength loss of the steel pipe by the injection hole when the force is applied vertically or horizontally. In other words, it is inevitable that the strength of the steel pipe by the injection hole is inevitable due to the formation of the injection hole. When the plurality of injection holes are arranged so as not to be located in the same row and column with respect to the positive end face of the steel pipe, the vertical force and The number of injection holes located in the path through which the horizontal force passes is reduced to minimize the strength loss caused by the injection hole.

Secondly, the spiral arrangement of the inlet leads to the dispersing arrangement of the inlet, and when the dispersedly arranged steel pipe is applied to the grouting method, the grouting liquid passing through the inlet is also dispersed evenly between the ground and the steel pipe, thus filling the steel pipe into the ground. Can be improved. In addition, even when the grouting liquid is not completely filled in the gap between the ground and the steel pipe, but is filled only around the inlet, the filling column formed by filling only the inlet around the inlet according to the spiral arrangement of the inlet is also spirally arranged so that the steel pipe is settled on the ground and Even if an external force is applied, the resistance can be improved.

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

1. Ground reinforcing grouting steel pipe

2 to 5 show various embodiments of the grouting steel pipe according to the present invention, the grouting steel pipe (P) of the present invention after a plurality of injection holes (H1, H2, H3, H4) is formed and installed in the ground When the grouting liquid is injected, the injection holes H1, H2, H3, and H4 are spirally arranged along the circumference of the steel pipe as a steel pipe having a predetermined cross section integrated with the ground.

According to the internal arrangement of the inlets H1, H2, H3, and H4, the number of inlets H1, H2, H3, and H4 in the same row and the same column can be reduced with respect to the positive section of the steel pipe. When the force is applied vertically or horizontally to the lead leads to the effect of minimizing the loss of strength by the inlet (H1, H2, H3, H4). That is, when the injection holes (H1, H2, H3, H4) is formed in the steel pipe, the loss of strength due to the injection holes (H1, H2, H3, H4) is inevitable. In the present invention, a plurality of injection holes (H1, H2, H3, H4) If possible, the number of inlets (H1, H2, H3, H4) located in the path through which the vertical and horizontal forces pass when the force is applied vertically or horizontally to the steel pipe by arranging it so as not to be located in the same row and column with respect to the steel pipe front end. In other words, the strength loss caused by the inlet (H1, H2, H3, H4) is minimized.

In addition, as a result of the spiral arrangement, since the plurality of injection holes H are dispersed than the conventional arrangement of FIG. 1, when the grouting liquid is injected through the injection holes H1, H2, H3 and H4, the grouting liquid is also dispersed and filled evenly. Effect.

2 is an embodiment of the most basic form of the grouting steel pipe (P) according to the present invention.

In the grouting steel pipe P of the present invention, the plurality of inlets H1, H2, H3, and H4 are arranged while forming regular lines in four directions. Specifically, the plurality of inlets of the present invention may include a plurality of inlets H1. A first inlet line 100 formed in a line at a predetermined interval in the longitudinal direction of the steel pipe and having the first inlet 111 positioned at the 12 o'clock direction from the front end surface of the steel pipe; A plurality of injection holes (H2) are formed in a line at the same interval as the interval between the injection holes (H1) of the first injection port line in the longitudinal direction of the steel pipe, the first injection hole 121 located in front of the steel pipe at the 3 o'clock direction A second inlet line 120 disposed; A plurality of injection holes (H3) are formed in a line at the same interval as the interval between the injection holes (H1) of the first injection hole line in the longitudinal direction of the steel pipe, the first injection hole 131 located in front of the steel pipe at the 6 o'clock direction A third inlet line 130 disposed; And, the plurality of injection holes (H4) are formed in a line at the same interval as the interval between the injection holes (H1) of the first injection hole line in the longitudinal direction of the steel pipe and the first injection hole 141 located in front of the nine o'clock from the front end of the steel pipe And a fourth inlet line 140 disposed in the direction.

Further in the above configuration, the present invention is disposed so that the inlet (H2) of the second inlet line is located at an intermediate point between the inlet (H1) of the first inlet line while the inlet (H4) of the fourth inlet line The first, second, third, and fourth inlet lines 110, 120, 130, and 140 are disposed to be located at an intermediate point between the inlets H3 of the third inlet line, and each of the first, second, third, and fourth inlet lines 110, 120, 130, and 140 is provided with a plurality of inlets for each line on the expanded view of the steel pipe. H1, H2, H3, H4) are arranged diagonally. The diagonal arrangement on the developed view results in the spiral arrangement in the three-dimensional shape. At this time, when the diagonal angle disposed in the diagonal line on the developed view is θ, it should be arranged to satisfy 0 <tanθ <b / a. Here, as shown in Fig. 2 (a), the diagonal angle θ is the degree of oblique line when the inlet line is disposed diagonally to the steel pipe cross section on the basis of the case where each inlet line is perpendicular to the steel pipe cross section in the steel pipe development view. The angle shown is a, where a is the horizontal distance between neighboring inlets (H) in the same line, based on the case where each inlet line is disposed perpendicular to the end face of the steel pipe in the flat view of the pipe, and b is each inlet line in the flat view of the steel pipe. This is the vertical distance between neighboring inlet lines based on the case where it is disposed perpendicular to the end face of the steel pipe.

In particular, the present invention proposes to satisfy 0 <tanθ <b / a with respect to the oblique angle θ, in which the inlet of one inlet line (when H1) is directly at the inlet H2 of the next inlet line. This is to avoid placing them next to each other. That is, if the oblique angle θ is 0, this will be the same as the conventional one as shown in FIG. 1, and if the diagonal value θ is b / a, the inlet of one of the inlet lines is immediately adjacent to the inlet of the next inlet line. Since the inlet of the inlet line and the inlet of the next inlet line will be continuously arranged vertically with respect to the end face of the steel pipe, the horizontal distance between the inlets can not be secured by a size, and thus the loss of bearing capacity may be rather large. It would be.

As a result of the configuration as described above, the present invention is a steel pipe in the actual steel pipe as shown in Figure 2 (a) while each inlet line (110, 120, 130, 140) are arranged diagonally on the steel pipe development view as shown in Figure 2 (b) Spirally disposed along the circumference, and is eventually completed as a ground reinforcing grouting steel pipe (P) that can minimize the strength loss by the inlet (H1, H2, H3, H4).

FIG. 3 is an embodiment in which the basic form of FIG. 2 is modified, and the first and third inlet lines mutual injection holes H1 and H3 and the second and fourth inlet lines mutual injection holes H2 disposed so that FIG. 2 faces each other. , H4 is disposed so as to be located in the same row with each other on the steel pipe development view, Figure 3 is the injection hole (H3) of the third inlet line between the first and second inlet line injection holes (H1, H2) on the steel pipe development view It is arranged to be positioned in a different column of the inlet (H4) of the fourth inlet line is arranged to be located in a different column between the second, third inlet line inlet (H2, H3) on the steel pipe development. That is, FIG. 2 is a form in which a plurality of injection holes H1, H2, H3, H4 are not located only in the same row, while FIG. 3 further goes here in the arrangement of injection holes H1, H2, H3, H4. Of course, the heat is a completed form so as not to be the same.

4 and 5 is an embodiment of a double pipe structure in which the inner pipe 200 having a plurality of spacers 210 mounted therein is inserted into the grouting steel pipe P of FIG. 3 as an exterior 100.

4 is an example in which the spacer 210 of the inner tube is provided in the form of a protrusion to be coupled to the outer circumferential surface of the inner tube 200 while being disposed in the same manner as the injection holes H1, H2, H3, and H4 of the outer tube 200. Also, the effect of the spiral arrangement can be expected similarly to the appearance 100. In particular, Figure 4 (a) shows an example in which the bolt is adopted as the spacer 210 of the projection form after forming the female threaded hole in the inner tube 200, between the appearance 100 and the inner tube 200 as the tightening degree of the bolt. It is advantageous because the interval can be adjusted.

5 is an example in which the spacer 210 of the inner tube is configured so that a plurality of protrusions are formed outward on a belt-shaped body surrounding the outer circumferential surface of the inner tube, and is an example proposed to simplify the installation of the spacer. That is, in the spacer 210 of FIG. 5, the protrusions may substantially serve as the spacer, and as a plurality of protrusions are installed as soon as one body is installed, a plurality of spacers may be actually installed.

2. Steel pipe grouting method

6 is a view showing a steel pipe grouting method using the grouting steel pipe (P) of FIG. 4 according to the present invention, a steel pipe grouting method will be described with reference to this. However, the steel pipe grouting method according to the present invention can be applied to the large diameter as well as the small diameter method regardless of the diameter of the steel pipe.

(a) Ground penetration grouting installation stage

Ground reinforcing grouting steel pipe (P) having the above-described injection port is spirally installed in the ground. Of course, adopting the double tube form of the outer tube 100 and the inner tube 200 as shown in Figure 4 (b) and Figure 5 (b) is advantageous because it can reduce the amount of grouting liquid used.

If the grouting steel pipe is provided as a direct-punched steel pipe, the construction work will be simplified since the penetration and installation of the steel pipe can be performed at the same time, but the present invention is advantageous for the integration of the steel pipe and the grouting liquid and the ground by the filling effect of the grouting liquid as described below. Considering that it is effective, it is expected to have more visible effect when a gap is formed between steel pipe grounds by using general drilling equipment rather than direct drilling.

In particular, if adopting a double pipe form of the exterior 100 and the inner tube 200, this step is the step of installing and inserting the exterior 100 in the ground reinforcing grouting steel pipe (P) in which the injection hole is spirally installed and inside the exterior 100 To proceed while dividing into the step of installing the inner tube (200). If the exterior 100 and the inner tube 200 are installed in the ground in an integrated state, it will be difficult to install due to its weight. This difficulty connects the entire length of the exterior 100 and the inner tube 200 in an integrated state. Rather than solving by the installation method while solving the method of installing the exterior 100 and the inner tube 200 separately, it is advantageous in terms of construction stability as well as structural stability. This completes the installation of the steel pipe of the double pipe structure.

(b) grouting step

When the inlet is installed intruding the ground reinforcing grouting steel pipe (P) arranged spirally, the grouting liquid is injected. If the double tube form of the outer tube 100 and the inner tube 200 is installed, the grouting liquid is to inject the grouting liquid between the outer tube 100 and the inner tube 200. The grouting liquid may be cement, urethane, or the like. When the grouting liquid is injected, the grouting liquid is discharged through the inlets (H1, H2, H3, H4) to fill the gap between the ground and the steel pipe, and when the grouting liquid is solidified, the steel pipe is settled on the ground and its reinforcement strength Will be used.

 When the grouting liquid is injected through the injection holes H1, H2, H3, and H4 because the ground reinforcing grouting steel pipe P is in a dispersed state in which a plurality of injection holes H1, H2, H3, and H4 are arranged in a spiral manner. Since the grouting liquid is also dispersed and filled evenly, when the grouting liquid is solidified, the steel pipe fixed on the ground exhibits excellent reinforcement strength.

Of course, even if the grouting liquid is not completely filled in the gap between the ground and the steel pipe, but only filled around the inlet (H1, H2, H3, H4), the inlet (H1) according to the spiral arrangement of the inlet (H1, H2, H3, H4) , H2, H3, H4) Filled only around the charger pole (when the grouting liquid is charged and solidified, it will be formed into a charger pole) Also spirally arranged, even if the steel pipe is settled on the ground and external force is applied from all directions The resistance can be improved.

Although the present invention has been described in detail with reference to the embodiments, those skilled in the art to which the present invention pertains will be capable of various substitutions, additions, and modifications without departing from the technical spirit described above. It is to be understood that such modified embodiments are also within the protection scope of the present invention as defined by the appended claims.

1 is a view showing a conventional grouting steel pipe.

2 to 5 are views showing various embodiments of the grouting steel pipe according to the present invention.

6 is a view showing a steel pipe grouting method using the grouting steel pipe of FIG.

<Description of the symbols for the main parts of the drawings>

100: appearance

110: first inlet line 120: second inlet line

130: third inlet line 140: fourth inlet line

111, 121, 131, 141: first inlet

H1, H2, H3, H4: Inlet

200: inner tube 210: spacer

P: Ground reinforcing grouting steel pipe

Claims (4)

As a plurality of injection holes (H1, H2, H3, H4) is formed and installed in the ground and then injected with grouting liquid as a steel pipe of a certain cross-section is integrated with the ground, The plurality of injection holes (H1, H2, H3, H4), A plurality of injection holes (H1) are formed in a line at a predetermined interval in the longitudinal direction of the steel pipe, the first inlet 111 is located in front of the first inlet line 110 is disposed in the 12 o'clock direction from the front end of the steel pipe; A plurality of injection holes (H2) are formed in a line at the same interval as the interval between the injection holes (H1) of the first injection hole line in the longitudinal direction of the steel pipe, the first injection hole 121 located in front of the three o'clock direction from the front end of the steel pipe A second inlet line 120 disposed in the second inlet line 120; A plurality of injection holes (H3) are formed in a line at the same interval as the interval between the injection holes (H1) of the first inlet line in the longitudinal direction of the steel pipe, the first inlet 131 located in front of the 6 o'clock direction from the cross section of the steel pipe A third inlet line 130 disposed in the line; And, A plurality of injection holes (H4) are formed in a line at the same interval as the interval between the injection holes (H1) of the first inlet line in the longitudinal direction of the steel pipe, the first inlet 141 located in front of the 9 o'clock direction from the front end of the steel pipe A fourth inlet line 140 disposed in the fourth inlet line 140; Configured to form The inlet H2 of the second inlet line is disposed to be located at an intermediate point between the inlet H1 of the first inlet line, while the inlet H4 of the fourth inlet line is between the inlet H3 of the third inlet line. Is positioned at the midpoint, Each of the first, second, third, and fourth inlet lines 110, 120, 130, and 140 may have a plurality of inlets H1, H2, H3, and H4 arranged in the same diagonal line on a steel pipe development view, and the diagonal angle is θ. When it is arranged to satisfy 0 <tanθ <b / a, while the first and the third inlet line mutual injection holes (H1, H3) and the second, fourth inlet line mutually disposed to face each other (H2, H4 The ground reinforcing grouting steel pipes are arranged spirally injected, characterized in that) is arranged so that each is positioned in the same row on the steel pipe development view. (here, Diagonal angle θ: The angle showing the degree of oblique line when the inlet line is arranged in a diagonal line with respect to the steel pipe cross section based on the case where each inlet line is perpendicular to the steel pipe cross section. a: The horizontal distance between neighboring inlets in the same line, based on the case where each inlet line is vertically disposed on the front end face of the steel pipe in the flat view of the steel pipe. b: The vertical distance between neighboring inlet lines based on the case where each inlet line is arranged perpendicularly to the cross section of the steel pipe in the steel pipe development view.) In claim 1, The steel pipe is a double pipe structure in which an inner tube 200 having a plurality of spacers 210 mounted on an outer surface thereof is inserted into the outer tube 100. The spacer 210 of the inner tube is disposed in the form of a protrusion and is coupled to the outer circumferential surface of the inner tube 200 in the same manner as the spiral injection holes H1, H2, H3, and H4, or the outer circumferential surface of the inner tube 200. A ground reinforcing grouting steel pipe having a spirally inserted inlet, characterized in that a projection is formed outwardly on a wrapping belt-shaped body. (a) penetrating and installing the ground reinforcing grouting steel pipe (P) in which the injection hole according to claim 1 or 2 is spirally arranged; (b) injecting grouting liquid into the ground reinforcing grouting steel pipe (P) in which the injection hole is spirally disposed; Steel pipe grouting method characterized in that it comprises a. In claim 3, In the step (b), the inner pipe 200 is installed with the spacer 210 installed inside the exterior 100 using the ground reinforcing grouting steel pipe P having the injection hole spirally arranged as the exterior 100 to form a double pipe. Comprising: and, Injecting the grouting liquid between the inner tube and the outer tube; Steel pipe grouting method comprising a.

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