JP5217225B2 - Ground reinforcement structure, construction method of ground reinforcement structure - Google Patents

Description

The present invention relates to a soil reinforcing structure, and construction how the soil reinforcement structure.

  Conventionally, in order to prevent subsidence of soft ground and collapse of slopes, a ground reinforcement method for improving the ground by stabilizing the ground has been performed. For example, a method as disclosed in Patent Document 1 or 2 Has been proposed.

  In Patent Document 1, a reinforcing material such as a steel rod is inserted into a hole drilled by boring, and mortar or grout cement is injected into the gap between the hole inner surface and the reinforcing material to integrate the reinforcing material and the ground. Thus, a so-called nailing method for constructing a ground reinforcing structure is disclosed.

Further, in Patent Document 2, a soil cement column is built in the ground by continuing stirring and mixing while pouring cement milk through the hollow shaft of the stirrer into the ground stirred by a specially shaped kneading auger. A soil cement construction method is disclosed in which a ground reinforcing structure is constructed by inserting and installing a core material in the hollow portion of the hollow shaft on the ground at the end of the excavated and stirred earth and sand range.
JP 2004-27813 A JP-A-5-222733

  However, in the ground reinforcement method disclosed in Patent Document 1 or 2, when the ground for constructing the ground reinforcement structure has high water permeability, when a grout material such as mortar or concrete cement in a fluid state is injected into the ground, The grouting material will dissipate to the surrounding ground before it solidifies. Therefore, in order to construct a ground reinforcing structure having sufficient strength, a large amount of grout material must be filled, which requires construction cost and construction time.

The present invention has been made in view of the above points, and with a simple configuration, it is possible to construct the filler filling the hole formed in the ground by solidifying it without escaping to the surrounding ground. and an object such soil reinforcing structure, and to provide a construction how the soil reinforcement structure.

In order to achieve the above-mentioned object, the present invention is a ground reinforcing structure, and a guide rod is inserted into the interior from the open base end of a bag body made of a material through which a filler that solidifies over time cannot pass. Is inserted together with an injection hose for injecting the filler, and the leading end on the closed side of the bag body is pushed into the hole formed in the ground by the guide rod, whereby the bag body is While being installed in the hole and pulling out the injection hose together with the guide rod from the hole, the filler is filled into the bag body in a fluid state by the injection hose, and the filler is solidified. it shall be the features of the made.

  According to the ground reinforcement structure of the present invention, the bag body can be solidified without causing the filler filled therein to dissipate into the ground, so that a reinforcement structure can be constructed. Compared to the ground reinforcement structure constructed by the disclosed ground reinforcement construction method, the ground reinforcement structure can be constructed with a small amount of filler, and the construction cost can be reduced and the construction time can be shortened.

In the onset Akira, material of the bag is included in the mesh size woven or nonwoven fabric having the above only moisture contained in the filling material to leach into the ground of the bag outside part, or the filling material You may be comprised with the water-impermeable material provided with the fine hole which allows only a water | moisture content to exude to the ground outside the said bag body.

  According to the ground reinforcing structure of the present invention, only the moisture in the filler filled in the bag body is leached into the ground, and the solidified component of the filler in the bag body is concentrated, so that the solidification of the filler is achieved. Promoted.

Further, the present invention is a method for constructing a ground reinforcing structure , wherein a guide rod is inserted into the interior of the bag from an open base end portion of a bag body made of a material through which a filler that solidifies over time cannot pass. insert with injection hose for injecting, the leading end of the side which is closed of the bag by the induction bars by forcing into the hole formed in the ground, and placing the bag body in said bore The filler is filled into the bag body in a fluid state by the injection hose while the injection hose is pulled out from the hole together with the guide rod , and the filler is solidified.

According to the present invention, with a simple configuration, a ground reinforcing structure that can be constructed by solidifying a filler filling a hole formed in the ground without being scattered to the surrounding ground, and the ground reinforcing structure thereof it is possible to provide a construction how.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.
1A and 1B show a ground reinforcing member according to the present embodiment, in which FIG. 1A is a side view and FIG. 1B is a cross-sectional view taken along line AA in FIG.

  As shown in FIG. 1, the ground reinforcing member 10 is, for example, an elongated bag body in which a distal end portion 10a of a flexible cylindrical member is closed, and an injection port 16 is formed at the base end portion 10b. ing. The ground reinforcing member 10 is installed in a hole cut in a bent shape in the ground as will be described later with the inside of the bag body empty, and then filled with concrete milk or the like from the inlet 16 into the bag body. A ground reinforcement structure is constructed by filling and solidifying the material.

  As a constituent material of the bag body, for example, a reinforcing cord 14 having a high tensile strength such as aramid yarn or carbon fiber is mixed into a woven fabric or a nonwoven fabric made of hemp or synthetic fiber having flexibility and wear resistance. Or a structure in which a plurality of reinforcing cords 14 are provided along the longitudinal direction around the ground reinforcing member 10 can be used. In the latter case, in order to evenly resist the bending load regardless of the direction from which direction the bending load is applied to the ground reinforcing structure constructed using the ground reinforcing member 10, FIG. As shown, the reinforcing cords 14 are preferably provided at equal intervals around the bag.

  The ground reinforcing member 10 is required to have a strength that can withstand the pressure (for example, 0.1 to 1 Mpa) of the filler injected into the ground reinforcing member 10. This is, for example, as strong as a fire hose.

  In addition, the ground reinforcing member 10 is preferably made of a woven fabric or a nonwoven fabric having such a roughness that only the moisture contained in the filler filled therein is leached into the ground outside the bag body. In addition, you may use the water-impermeable film | membrane provided with the fine hole not only the said woven fabric or a nonwoven fabric.

  Furthermore, it is preferable that the ground reinforcing member 10 can be expanded and contracted so that the bag body expands to some extent so that the ground reinforcing member 10 is in close contact with the hole wall when the inside thereof is filled with a filler.

  Further, as the ground reinforcing member 10, a member having a tensile strength that can sufficiently resist the tensile force generated in the ground reinforcing structure due to a bending load or the like when it becomes a part of the ground reinforcing structure is used. In addition, a filler having a compressive strength that can sufficiently resist the compressive force generated in the ground reinforcing structure due to a bending load or the like when it becomes a part of the ground reinforcing structure is used.

  Next, a procedure for constructing a ground reinforcement structure in order to reinforce a foundation under the embankment 20 constructed on a soft ground, for example, using such a ground reinforcement member 10 will be described.

FIG. 2 is an explanatory diagram for explaining the procedure of the first construction method for constructing the ground reinforcing structure using the ground reinforcing member 10.
As shown in FIG. 2, the first construction method includes a bending hole drilling step S110, a ground reinforcing member installation step S120, and a filler filling step S130.

  In the drilling step S110 of the bent hole, drilling is started obliquely from the surface position adjacent to the embankment 20 constructed on the ground surface toward the foundation ground below the embankment 20 to be reinforced, and the tip of the hole is embankment. When reaching the lower position of the edge of 20, the drilling direction is changed to the horizontal direction (step S111), and then a bent hole (bent hole 22) having a horizontal portion of a predetermined length is drilled. (Step S112).

  In the drilling step S110 of the bent hole, a known induction-type universal boring machine capable of freely changing the drilling direction in the ground (for example, a drilling machine using a terra-jet method or an urban nodic method) Can be used. In addition, after drilling the bending hole 22, the drill bit 21 and the boring rod 23 of the boring machine used for drilling are pulled out and collected.

  In the ground reinforcing member installation step S120, a guide rod 24, such as a metal wire, which is bendable and elastic, is inserted into the inside of the base end portion of the bag body of the ground reinforcing member 10 (step S121). Then, the bag body is inserted into the bent hole 22 by pushing the closed end portion 10a to the tip of the bent hole 22 drilled in step S110 (step S122). Here, when the ground reinforcing member 10 is inserted into the bending hole 22 using the guide rod 24, for example, a protective member such as a cushion is attached to the guide rod so that the tip of the guide rod 24 does not damage the ground reinforcing member 10. Take measures such as providing it at the tip of 24. In addition, after installation of the ground reinforcement member 10, the guide rod 24 is pulled out from the hole and collected.

  In the filling material filling step S130, the ground reinforcing structure 40 is constructed by filling and solidifying the inside of the ground reinforcing member 10 installed in the bent hole 22 in the step S120. The filler 26 is filled through the inlet 16 described above. In addition, in order to improve the tensile strength of the concrete after solidification, it is preferable to use a filler mixed with a reinforcing fiber material such as steel fiber or glass fiber.

  When injecting the filler 26, pressurization is performed until the injection pressure becomes about 0.1 to 1 MPa. Then, the injection port 16 is sealed so that the internal pressure is maintained after the injection is completed. Thereby, the water in the filler 26 filled in the ground reinforcing member 10 is squeezed and leached into the ground, and a certain amount of the solidified component of the filler 26 in the ground reinforcing member 10 is concentrated and solidified. Thus, the ground reinforcement structure 40 is constructed.

Further , for example, when an injection hose is placed along the guide rod 24 and the step S120 is performed, the injection hose is inserted together with the guide rod 24 from the base end portion 10b of the ground reinforcement member 10, and the ground reinforcement member 10 is attached. placed in until the tip of the bent hole 22, while pulling the subsequent induction rod 24 from the hole, the filling material through the injection hose to fill the bag body.

  Thereby, the installation process S120 of the ground reinforcing member and the filling process S130 of the filler can be performed simultaneously. In addition, since the filling material is filled into the bag body from the distal end portion 10a of the bent hole 22, the air in the bag body can be smoothly sent from the distal end portion 10a to the proximal end portion 10b when not filled. The ground reinforcement structure 40 having a highly reliable rigidity can be constructed by avoiding air remaining in the body.

  About the installation process S120 of the ground reinforcement member demonstrated above, you may use the installation method by pneumatic insertion as shown in FIG.

  As shown in FIG. 3, in the installation method by air pressure insertion, for example, the ground reinforcing member 10 is folded in the vicinity of the hole of the bent hole 22 in a bellows shape, and the tip 10a is installed from the hole toward the inside of the hole. The ground reinforcing member 10 is inserted into the bottom of the hole by injecting air from the inlet 16 into the interior of the container (step S123), thereby applying a propulsive force to the bag body or expanding the bag body (step S124).

  In carrying out the installation method by air pressure insertion, when the ground reinforcing member 10 is inserted into the hole, an air vent hose 28 for releasing the air in the hole forward from the ground reinforcing member 10 into the atmosphere is provided at the tip thereof. It is preferable to install in advance to reach the vicinity of the hole tip. Thereby, the ground reinforcement member 10 can be smoothly inserted into the hole bottom.

  Moreover, in the installation method by air pressure insertion, you may press-fit the filler 26 instead of press-fitting air in the ground reinforcement member 10. FIG. Thereby, the installation step S120 of the ground reinforcing member and the filling step S130 (see FIG. 2) of the filler can be performed simultaneously.

  FIG. 4 is an explanatory diagram for explaining the procedure of the second construction method for constructing the ground reinforcing structure using the ground reinforcing member 10. In FIG. 4, the same reference numerals are given to the same parts as those in FIG. 2, and the description thereof is omitted.

  As shown in FIG. 4, the second construction method includes a bending through hole drilling step S210, a ground reinforcing member installation step S220, and a filler filling step S230.

  In the bent through hole drilling step S210, in the same manner as in the bent hole drilling step S110 described with reference to FIG. 2, a bent hole having a horizontal portion of a predetermined length is drilled (step S211), and further toward the ground surface. Then, the bent through hole 30 that has been drilled to the ground surface by changing the drilling direction is drilled (step S212).

  The bent through hole 30 is also drilled using the same induction type boring machine as in the first construction method.

  In the ground reinforcing member installation step S220, the base end portion of the ground reinforcing member 10 is disposed in the vicinity of the distal end portion of the boring rod 23 of the induction-type universal boring machine used when penetrating the ground between both sides of the embankment 20 in the previous step S210. The ground reinforcing member 10 is pulled into the bent through hole 30 by attaching 10 b and pulling out the boring rod 23.

  Further, in the same figure, the ground reinforcing member 10 is arranged in a part of the region of the bent through hole 30 (the central horizontal portion and the inclined portion on the right side in the drawing as in the first method), but this is not the only case. Instead, it may be installed in the entire region of the bent through hole 30 that has been drilled. Here, when arranging in a part of the area of the bent through hole 30 as in the former, it is preferable to backfill the hole portion 30c where the ground reinforcing member 10 is not installed with concrete or earth and sand.

  The filler filling step S230 performed in the second method is the same as the filler filling step S130 in the first method.

  According to the ground reinforcing structure 40 of the present embodiment described above, the ground reinforcing member 10 which is a bag body is solidified without causing the solidified component of the filler 26 filled therein to dissipate into the ground, thereby reinforcing Since the structure can be constructed, the ground reinforcement structure 40 can be constructed with a small amount of the filler 26, and the construction cost and the construction time can be shortened.

  Further, according to the ground reinforcing structure 40 of the present embodiment, the ground reinforcing member 10 has such a coarseness that only the moisture contained in the filler filled therein is leached into the ground outside the bag body. By being made of woven or non-woven fabric, moisture in the filler 26 filled in the ground reinforcing member 10 is compressed and leached into the ground, and the solidified component of the filler 26 in the ground reinforcing member 10 is concentrated. Therefore, solidification of the filler 26 is promoted.

  In addition, the ground reinforcing member 10 of this embodiment is a woven or non-woven fabric having a fineness such that only water outflows into the ground outside the bag body among the fillers 26 filled therein, or a fine material. Although the water-impermeable film provided with holes is used, the present invention is not limited to this, and a bag body from which moisture does not leach may be used. In this case, hydraulic concrete or the like that can be solidified while containing moisture is used as the filler 26.

  Moreover, in this embodiment, although the example which reinforces the soft ground under the embankment 20 using the ground reinforcement member 10 was shown, the tunnel of a shallow earth covering passing directly under a railroad track, a road, etc., or a shield Applicable for reinforcement.

  FIG. 5 shows an installation example of a ground reinforcement structure on the upper ground of a tunnel or shield that crosses at right angles to the railroad track. FIG. 5 (a) is a plan view, FIG. 5 (b) is a cross-sectional view, FIG. c) is a longitudinal sectional view.

  As shown in FIG. 5, the ground reinforcing structure 40 is disposed on the ground between the embankment 20 and the tunnel or shield 50 in the same direction as the extending direction of the tunnel or shield 50 and horizontally by the ground reinforcing method described above. (Refer to (c) in the figure), a plurality of structures are constructed around the tunnel or shield 50 (see (a) and (b) in the same figure).

  FIG. 6 shows an example of ground reinforcement structure installed on the upper ground of the tunnel or shield crossing obliquely with the railway track. FIG. 6 (a) is a plan view and FIG. 6 (b) is a cross-sectional view. is there.

  As shown in FIG. 6, unlike the case of FIG. 5 mentioned above, the ground reinforcement structure 40 is arrange | positioned in the direction orthogonal to the extending direction of the tunnel or the shield 50 (refer the figure (a) and the figure (b)). The tunnel or shield 50 is constructed in a plurality of extending directions (see FIG. 5A).

  Compared to the case where the tunnel or shield 50 in FIG. 5 is orthogonal to the railroad track, the tunnel or shield 50 in FIG. 6 crosses the railroad track, and therefore the distance across the railroad track becomes longer. If it is going to construct the ground reinforcement structure 40 with the same arrangement | positioning, the drilling of a long distance bending hole and installation of the ground reinforcement member 10 to the bending hole will be needed, and construction cost and construction time will be needed. This is because of this.

  In addition, the ground reinforcing member 10 of the present embodiment is used to reinforce the bent-shaped ground reinforcing structure 40, but is not limited thereto, and may be used to reinforce a linear ground reinforcing structure. Needless to say.

The ground reinforcement member which concerns on this embodiment is shown, The figure (a) is a side view, The figure (b) is AA sectional drawing of (a). It is explanatory drawing for demonstrating the procedure of the 1st construction method which builds a ground reinforcement structure using a ground reinforcement member. It is explanatory drawing for demonstrating the installation method by the air pressure insertion of a ground reinforcement member. It is explanatory drawing for demonstrating the procedure of the 2nd construction method which builds a ground reinforcement structure using a ground reinforcement member. The installation example of the ground reinforcement structure on the upper ground of the tunnel or shield crossing perpendicularly to the railway track is shown, (a) is a plan view, (b) is a cross-sectional view, and (c) is a longitudinal section. FIG. The example of installation of the ground reinforcement structure to the upper ground of the tunnel or shield crossing obliquely with the railroad track is shown, and the same figure (a) is a plan view and the same figure (b) is a cross-sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ground reinforcement member 14 Reinforcement cord 16 Inlet 20 Filling 22 Bending hole 23 Boring rod 24 Guide rod 26 Filler 28 Air vent hose 30 Bending through-hole 40 Ground reinforcement structure 50 Tunnel or shield 10a Tip 10b Base end S110 Bending hole Drilling process S120 Ground reinforcement member installation process S130 Filling material filling process S210 Bending through hole drilling process S220 Ground reinforcement member installation process S230 Filling material filling process

Claims (3)

It is a ground reinforcement structure,
A guide rod is inserted into the inside of the bag from the open base end portion of the bag made of a material that cannot pass through the filler that solidifies over time, together with an injection hose for injecting the filler, and the guide rod The bag body is installed in the hole by pushing the tip of the closed side of the bag body into the hole formed in the ground,
The filler is filled into the bag body in a fluid state by the injection hose while the injection hose is pulled out from the hole together with the guide rod, and the filler is solidified. Ground reinforcement structure. The material of the bag body is a woven or non-woven fabric having a roughness that allows only the moisture contained in the filler to leached into the ground outside the bag body, or only the moisture contained in the filler. 2. The ground reinforcement structure according to claim 1, wherein the ground reinforcement structure is made of a water-impermeable material provided with fine holes that are leached into the ground outside the body. It is a construction method of ground reinforcement structure,
A guide rod is inserted into the inside of the bag from the open base end portion of the bag made of a material that cannot pass through the filler that solidifies over time, together with an injection hose for injecting the filler, and the guide rod The bag body is installed in the hole by pushing the tip of the closed side of the bag body into the hole formed in the ground,
The ground reinforcement is characterized in that the filler is filled in the fluid state in the bag by the injection hose while the injection hose is pulled out from the hole together with the guide rod, and the filler is solidified. Construction method of structure.

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