KR20050030095A - Pressure-type grouting apparatus for reinforcing the ground and hybrid-type nailing method by pressurized using the apparatus - Google Patents

Abstract

A pressure grouting apparatus for reinforcing a ground and a hybrid nailing method by injecting pressure are provided to reinforce the ground efficiently by injecting cement milk and cement mortar to a bore and the ground through an injection pipe, and to distribute load evenly by increasing compression strength. A bore is perforated horizontally and inclined on a ground in excavating a tunnel, or a slope in a hybrid nailing method. A reinforcement injection pipe(120) and a sealing hose(130) are installed to the bore of the ground. Plural filler discharge penetration holes(120h) are formed in the reinforcement injection pipe, and cement mortar or a sealing agent adjusting gel time is charged in the bore by the sealing hose. A one-way valve or a rubber sleeve is installed to the filler discharge penetration hole to restrict filler from being streamed back or foreign matters from being infiltrated into the pipe. The bore is sealed by an acceleration expansion agent(140), and a nipple(150) is installed around an inlet of the reinforcement injection pipe.

Description

Pressure-type grouting apparatus for reinforcing the ground and hybrid-type nailing method by pressurized using the apparatus

The present invention relates to a pressure grouting device for ground reinforcement and a hybrid nailing method by pressure injection using the same, and in particular, a plurality of injection holes are radially formed in a state in which the inlet hole is completely closed with a quick expanding material. The cement reinforcement effect is maximized by filling cement mortar and cement milk tightly through the perforated hole and the perforated hole at the time of drilling by using steel pipe, FRP pipe, PVC pipe, deformed rebar and Excel pipe. The present invention relates to a pressure grouting device for ground reinforcement and a hybrid nailing method by pressure injection using the same.

In general, the Soil Nailing method, which is widely used in Europe and the United States for slope stabilization, is a ground reinforcement method consisting of drilling, installation of deformed steel reinforcement, cement milk filling, shotcrete casting, and excavation. The design concept is that the torsion of the area reinforced to the deformed reinforcing bar acts like an integrated retaining wall, thereby maintaining stability on any slope that the reinforcement walls can assume.

In the construction by the above-described soil nail method, a release reinforcing bar is inserted into a perforated hole, and cement milk is filled into the perforated hole by gravity without pressure. Then, after installing the wire mesh on the wall surface and placed the reinforcing bars horizontally and vertically on the wire mesh, after pressing and fixing the reinforcing bars with a pressure plate and nut fastened to the nail is poured shotcrete. On the other hand, the grouting should be completely filled inside the perforated hole, because the gravity grouting is applied, the solidification time is long, the shrinkage phenomenon is caused by the water / cement ratio (W / C ≒ 45%) to about 3 to 6 times Iterative grouting of is required. Therefore, there exists a problem that workability falls.

The present invention was created in order to solve the problems in the prior art as described above, the injection pipe (including the reinforcing material) is formed a plurality of injection holes radially in a state in which the inlet hole is completely closed with a quick expandable expansion material And filling the cement mortar or sealing material with the high pressure hose in the first hole, and secondly, the cement milk is filled with the perforated hole and the perforated hole relaxed at the proper pressure from the inlet of the injection pipe or the inside of the injection pipe. The purpose of the present invention is to provide a pressure-based grouting device for reinforcing the ground that can maximize the reinforcing effect and further improve the workability by filling the ground tightly, and a hybrid nailing method by pressure injection using the same.

The present invention is a reinforcement combined injection pipe formed with a plurality of through-holes for discharging the injection material in the hole drilled in the ground in the horizontal direction or the up and down slope direction for the purpose of reinforcing the ground for tunnels, slopes and ground excavation; The present invention relates to a pressure grouting device in which a sealing hose installed to check a tight filling degree of an injection material and a hole in which a perforated hole in which the reinforcing material combined injection pipe and the sealing hose are installed are sealed to a predetermined depth with a rapid expansion material.

Hybrid nailing method by pressure injection according to the first embodiment of the present invention using the above device,

Drilling holes in the ground in a horizontal direction, or in an up and down slope direction for the purpose of reinforcing the ground for tunnels, slopes and ground excavation;

(1) reinforcement combined injection pipes consisting of existing steel pipes or FRP pipes for civil engineering structures having a plurality of injection material discharge through holes formed in the perforated holes, (2) PE pipes having a plurality of injection material discharge through holes formed therein; (1) + (4) of separate inlet tubes consisting of PVC pipes, (3) separate reinforcement in the form of deformed rebar or rods, and (4) sealing hoses (for injection of cement mortar or sealant). (2) + (3) + (4), (2) + (4), (3) + (4) in the form of a combination;

Sealing a perforated hole in which the reinforcement, the injection pipe, and the sealing hose are installed to a predetermined depth with a quick expandable material; And

Filling the inside of the drilling hole by a pressure or gravity filling method of the cement mortar or gel time-controlled sealing material through the sealing hose;

Through the reinforcement material injection tube, PE pipe or PVC pipe, the cement milk at a predetermined pressure or a single injection using a nipple device or a multi-step injection using a packer for injection. It is characterized in that it comprises the step of tightly filling between the voids or discontinuous surfaces of the relaxed ground of the periphery.

In addition, the hybrid nailing method by pressure injection according to the second embodiment of the present invention in order to achieve the above object,

In tunnels, slope cutouts and underground excavation, drilling a hole in the ground in the horizontal direction, the up and down inclined direction;

Installing a separate reinforcement and sealing hose composed of an injection pipe, a deformed steel reinforcing bar, and an FRP rod, etc., including a PVC pipe, an Excel pipe, etc., in which a plurality of injection material discharge through holes are formed in the perforated hole;

Sealing the inlet of the drilled hole in which the injection pipe, the reinforcement and the sealing hose are installed to a predetermined depth with a quick expandable material; And

Filling the inside of the drilling hole with a sealing material of cement mortar or gel time controlled through the sealing hose;

It is characterized in that it comprises a step of filling the cement milk through the injection tube once or multistage additionally by pressure between the loose ground or the void or discontinuous surface of the perforated hole and the periphery of the perforated hole have.

In addition, in order to achieve the above object, the hybrid nailing method by pressure injection according to the third embodiment of the present invention,

In tunnels, slope cutouts and underground excavation, drilling a hole in the ground in the horizontal direction, the up and down inclined direction;

Installing a separate reinforcement member including an injection tube, a deformed steel reinforcing bar, and an FRP rod formed of a PVC pipe, an Excel pipe, etc., in which a plurality of injection material discharge through holes are formed in the perforated hole;

Sealing the inlet hole with the injection tube and the reinforcement to a predetermined depth with a quick expandable material; And

Injecting the cement mortar or sealing material at a predetermined pressure by a nipple device installed at the inlet of the injection pipe to tightly fill the gap between the space or the discontinuous surface of the loose ground in the perforated hole and the periphery of the perforated hole Has its features.

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

1 is a view showing a ground reinforcing grouting method according to a first embodiment of the hybrid nailing method by pressure injection according to the present invention.

Referring to Figure 1, according to the hybrid nailing method by the pressure injection according to the first embodiment of the present invention, first in the tunnel, slope incision and underground excavation, the ground 110 in the horizontal direction or the up and down slope direction The hole 110h is drilled into the hole.

Thereafter, the perforated hole 110h has a plurality of injection material discharge through-holes 120h formed therein, and the cement mortar or the sealing time of the gel time-controlled sealing material is tightly filled in the perforated hole. Install a sealing hose 130 for. Here, as the reinforcing material combined injection pipe 120, a steel pipe or a fiberglass reinforced plastics (FRP) pipe for civil engineering may be used. Preferably, the one-way valve and the rubber sleeve are respectively provided in the plurality of injection material discharge through holes 120h formed in the injection pipe 120. This prevents the injection material from flowing backward when the injection material is injected through the injection pipe 120 under pressure, and also prevents foreign substances from entering the inside of the pipe when the injection pipe 120 is installed inside the drilling hole 110h. It is for.

In this way, when the installation of the reinforcing material combined injection pipe 120 and the sealing hose 130 is completed, the drill hole entrance in which the reinforcing material combined injection pipe 120 and the sealing hose 130 is installed to the rapid expansion material 140 to a predetermined depth. (For example, about 30 cm deep from the opening of the drill hole). Here, the quick-expandable expander 140 may be a product that can exhibit an effect equivalent to CEROMAX CX-1 (a trademark of a super fastener waterproofing agent as one of construction / civil chemicals) or foamed urethane.

When the sealing operation for the inlet hole is completed by the above, the sealing material of the cement mortar or the gel time (Gel Time) is controlled using the sealing hose so that the inside of the hole is tightly closed by gravity filling method or proper pressure. Charge (sealing work). When the sealing operation is completed, the nipple (150) is installed at the inlet of the injection pipe 120, it is firmly combined with an external injection material supply hose (not shown) to further inject cement milk under pressure. In order to fill the small space between the void and discontinuous surface of the ground around the perforation hole, additional cement milk (45% of water / cement ratio) can be additionally injected by using the packer device inside the injection pipe. have.

2 is a view showing a ground reinforcing grouting method according to a second embodiment of the hybrid nailing method by pressure injection according to the present invention.

Referring to FIG. 2, the hybrid nailing method by pressure injection according to the second embodiment of the present invention is not substantially different from the grouting method of the first embodiment. However, in the case of the first embodiment, while the injection pipe also serves as a reinforcing material, in the case of the second embodiment, it is noted that the characteristic difference is that the reinforcing material is separately installed.

According to the hybrid nailing method by pressure injection according to the second embodiment of the present invention, first, the hole in the ground 210 in the horizontal direction or the up and down slope direction for the purpose of reinforcing the ground for tunnels, slopes and ground excavation Punch 210h.

Then, an injection pipe 220 having a plurality of injection hole discharge holes 220h formed in the perforated hole 210h, and a separate reinforcement 225 and a sealing hose 230 are installed. Here, the injection pipe 220 may be used, such as PVC pipe or Excel pipe. Preferably, a plurality of injection material discharge through holes 220h formed in the injection pipe 220 are provided with a one-way valve and a rubber sleeve, respectively. This is to prevent the injection material from flowing back when the injection material is injected through the injection pipe 220 and to prevent foreign substances from flowing into the pipe when the injection pipe 220 is installed inside the drilling hole 210h. As the reinforcing material 225, a deformed bar (D29) or an FRP rod may be used.

In this way, when the installation of the injection pipe 220, the reinforcing material 225 and the sealing hose 230 is completed, the injection pipe 220, the reinforcing material 225 and the sealing hose 230 to the rapid expansion expander 240 is The installed hole 210h is sealed to a predetermined depth (for example, about 30 cm deep from the hole of the hole). Here, the quick-expandable expander 240 may be used CEROMAX CX-1, SSA-C or foamed urethane.

When the sealing operation for the inlet hole is completed by the above, the sealing material of the cement mortar or the gel time (Gel Time) is controlled using the sealing hose so that the inside of the hole is tightly closed by gravity filling method or proper pressure. Charge (sealing work). When the sealing operation is completed, the nipple (150) is installed at the inlet of the injection pipe 120, it is firmly combined with an external injection material supply hose (not shown) to further inject cement milk under pressure. In order to fill the small space between the void and discontinuous surface of the ground around the perforation hole, additional cement milk (45% of water / cement ratio) can be additionally injected by using the packer device inside the injection pipe. have.

3 is a view showing a ground reinforcing grouting method according to a third embodiment of the hybrid nailing method by pressure injection according to the present invention.

Referring to FIG. 3, the hybrid nailing method by pressure injection according to the third embodiment of the present invention is not substantially different from the grouting method of the first and second embodiments. However, while the injection pipe, the reinforcing material and the sealing hose of the second embodiment are installed in the drilling hole, in the case of this third embodiment, the PVC pipe or the Excel pipe is used as the injection pipe without the sealing hose. The difference is that it is characteristic.

According to the hybrid nailing method by pressure injection according to the third embodiment of the present invention, first, a hole in the ground 310 in the horizontal direction or the up and down slope direction for the purpose of reinforcing the ground for tunneling, slopes and ground excavation Punch 310h.

Thereafter, a plurality of injection material discharge through holes 320h are formed in the perforated hole 310h to install an injection pipe 320 and a separate reinforcing material 325. Here, the injection pipe 320 may be used, such as PVC pipe or Excel pipe, the reinforcing material 325 may be used a deformed reinforcement (D29) or FRP rod.

In this way, when the installation of the injection pipe 320 and the reinforcing material 325 is completed, the entrance of the drilling hole (310h) in which the injection pipe 320 and the reinforcing material 325 is installed to the rapid expansion material 340 to a predetermined depth (eg For example, to a depth of about 30 cm from the hole opening. Here, the quick-expandable expander 340 may be used CEROMAX CX-1, SSA-C or foamed urethane.

When the sealing operation to the inlet portion of the drilling hole is completed by the above, the injection material is injected at a predetermined pressure through the injection pipe 320 to tightly seal the space between the inside of the hole and the perforated hole or the discontinuous surface of the hole. To charge. At this time, the injection work is to inject the cement mortar first, and in the loose ground to additionally inject a second cement milk (water / cement ratio 45%) in order to fill the small space around the perforated hole to be tightly closed. Can be.

As described above, the hybrid nailing method by pressure injection according to the present invention is carried out in the tunnel, slope and ground excavation, etc. in the horizontal, up, down slope direction using a pneumatic punching machine to the required length Establish a sealing hose and reinforcement material and (1) use an existing steel pipe or FRP pipe having a plurality of injection material discharge through-holes as a reinforcement material for a combination of injection pipes, or (2) injection pipes and structures for pressure injection. By reinforcing the cement mortar or cement milk tightly between the reinforcing material and the drilling hole by using the reinforcing material separately, the structural reinforcement by the solidification of the injection material is integrated with the perforating hole and the surrounding ground, compared to the gravity filling method of the conventional cement milk. Strong ground reinforcement effect can be exerted. In addition, by injecting high-strength cement milk in multiple stages using a pressure packer between relaxed voids and discontinuous surfaces of the ground around the drilled hole using the injection pipe, the compressive strength of the solidified body is larger than that of the existing method and the surrounding ground is larger. Since the order and the ground strength increase effect can be obtained at the same time, it is very advantageous in terms of load sharing.

1 is a view showing a ground reinforcing grouting method according to a first embodiment of the hybrid nailing method by pressure injection according to the present invention.

2 is a view showing a ground reinforcing grouting method according to a second embodiment of the hybrid nailing method by pressure injection according to the present invention.

3 is a view showing a ground reinforcing grouting method according to a third embodiment of the hybrid nailing method by pressure injection according to the present invention.

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

110,210,310 ... Ground 110h, 210h, 310h ... Drilled hole

120,220,320 ... injection pipe 120h, 220h, 320h ... through hole for discharging injection material

130,230 sealing hose 140,240,340 ...

150,250 ... nipple 225,325 ... reinforcement

Claims (9)

In the grouting device for the purpose of reinforcing the ground for tunnels, slopes and ground excavation, Reinforcement injection pipe with a plurality of injection hole discharge holes formed in the hole drilled in the horizontal or up and down slope direction on the ground excavation surface that is difficult to stand alone, and a sealing hose installed to check the tight filling degree of the injection material. A pressure grouting device for ground reinforcement characterized by sealing the entrance of the drilling hole in which the reinforcing material combined injection pipe and the sealing hose are installed to a predetermined depth with a quick expanding expander and then injecting grouting liquid. The method of claim 1, The fastening expandable material is a pressure grouting device for ground reinforcement, characterized in that any one of the super-fast waterproofing material CEROMAX CX-1, SSA-C or foamed urethane. The method of claim 1, The reinforcing material inlet pipe and sealing hose inlet are further provided with a nipple to pressure-inject the grout, and prevents the backflow of the injection material into the plurality of injection material discharge through-holes formed in the reinforcing material inlet pipe and introduce foreign substances into the injection pipe. Pressure grouting device for reinforcing grounds, characterized in that any one-way valve or vinyl tape is installed to prevent. The method according to any one of claims 1 to 3, The pressure grouting device for reinforcing the ground, characterized in that the reinforcement made of any one of the structural steel pipe, carbon fiber rod and FRP rod or deformed reinforcing bar is formed on the outer surface in addition to the injection pipe and the sealing hose. (a) drilling holes in the ground in the horizontal direction, the up and down slope direction, for the purpose of reinforcing the ground for tunnels, slopes and ground excavation; (b) a reinforcing and reinforcing pipe composed of an existing steel pipe or a civil engineering structural FRP pipe having (1) a plurality of injection material discharge through holes formed in the perforated hole, and (2) a plurality of injection material discharge through holes formed therein. (1) Among the components of a separate injection tube consisting of PE or PVC pipe, (3) Separate reinforcement in the form of a rebar or rod, (4) Sealing hoses (for injection of cement mortar or sealing material) (4), (2) + (3) + (4), (2) + (4), (3) + (4) the step of installing in the combined form; (c) sealing the entrance of the drilled hole in which the reinforcement, the injection pipe, and the sealing hose are installed to a predetermined depth with a quick expandable material; And (d) filling the inside of the drilling hole by the pressure or gravity filling method of the sealing material of which cement mortar or gel time is controlled through the sealing hose; (e) One-time injection or packer device installed inside the injection pipe using a nipple device installed at the inlet of the cement milk at a predetermined pressure through the reinforcement combined injection pipe, PE pipe or PVC pipe Hybrid nailing method by pressure injection comprising a step of filling tightly between the gap or discontinuous surface of the loose ground in the perforated hole and the periphery of the perforated hole by multi-step injection. The method of claim 5, In the step (b), in order to prevent the backflow of the injection material into the plurality of injection material discharge through-holes formed in the reinforcement combined injection pipe, PE pipe or PVC pipe and to prevent foreign substances from entering the injection pipe, one-way valve or rubber sleeve Hybrid nailing method by pressure injection, characterized in that each one of the installation. The method of claim 5, Hybrid nailing method by pressure injection, characterized in that any one of CEROMAX CX-1, SSA-C or foamed urethane is used as the rapid expansion in the step (c). The method of claim 5, Hybrid nailing method by pressure injection, characterized in that consisting of the step (e) to omit the sealing operation step carried out in the step (d). The method of claim 5, Hybrid nailing, characterized in that it comprises the step of repeatedly injecting cement mortar or sealing material at a predetermined pressure by a nipple device installed in the inlet of the injection tube without the sealing operation step carried out in the step (d) Method.