KR100402952B1 - Slope-Geo FRP (Fiberglass Reinforced Plastics) Reinforced System - Google Patents

Abstract

The present invention is a slow-geo which focuses on the stability of rock cutting or general cutting slope and the ease of slope greening and economic slope stabilization construction in civil engineering works such as road, railway, subway, airport, large-scale facility site construction work. To provide a FRP reinforcement system (SGRS: Slope-Geo Fiberglass Reinforced Plastics (Reinforced system) Reinforced system), the step of drilling a hole for the injection pipe to the slope of the reinforcement target section; Entering a glass fiber reinforced pipe (FRP) injection tube provided with a spacer for maintaining a gap between the grout material ejection hole and the main surface of the hole into the hole; Caulking step to block the hole inlet of the hole and the injection pipe and sealing step to fill the space, pressure injection of the grout material through the injection pipe and some of them are consolidated in some space between the hole and the injection pipe through the injection hole An injection step of filling and filling most of the grout material into the gap of the joint surface scattered on the main surface of the hole; A wire mesh laying step of laying the wire mesh on the slope after the grout material is cured and allowing the outer end of the injection pipe to escape to the mesh of the corresponding position; Insert the pressure plate on the outer end of the injection pipe from the outside of the steel wire network and install two steel wires in the longitudinal and horizontal direction so as to deflect the injection pipe, and insert the external anchorage on the outer end of the injection pipe and fasten the liner nut to fix it. As a fixation step, Slope-Geo FRP Reinforcement System (SGRS) is provided to stabilize the slope.

Description

Slope-Geo FRP (Fiberglass Reinforced Plastics) Reinforced System}

The present invention is a slow cut of the incision slope, the stability of the inclined slope in which the rock surface is developed, the ease of slope greening, and the incision using the glass fiber reinforced pipe (FRP) injection tube and wire mesh focused on economic slope stabilization construction It relates to a Slope-Geo Fiberglass Reinforced Plastics (SGRS) Reinforced System (SGRS).

Accidents occur frequently when opening a road in a mountainous area where rock layers exist or cutting a mountainous area during a stop operation to construct road extension, railway, or site construction work. The higher the strength of the rock, the more stable the incision surface is. However, the incision site is often collapsed due to the development of discontinuities such as broken gaps and joint surfaces. The discontinuity of these rocks is due to the cause of rock formation or blasting excavation.In sea ice or rainy season, especially the jointed surface, a large amount of water is infiltrated and the environmental action such as freezing and thawing adds to the collapse of the rock. Happens.

As a reinforcement method for preventing the collapse of rock slopes generated along the joint surface, there are a rock bolt reinforcement method and a soil nail reinforcement method.

In FIG. 10, the rock bolt reinforcement method is a reinforcement method mainly applied to a slope where discontinuity is expected in a hard rock layer, and a hole (b) having a hole diameter of 38 mm at regular intervals is cut at a predetermined interval on the inclined slope (a). After inserting a steel bar (c) with a diameter of 25 mm or 29 mm, given in (g), the hole (b) and the space around the inserted steel bar are injected into the cement milk (d) without pressure and exposed on the incline (a). Insert the cover plate (e) of 30 × 30 mm at the outer end of the steel bar (c) and fasten the nut (f) to the slope so that the steel bar acts as the tension member and the internal fixing body, and the cover plate is the external fixing body. The role of the reinforcement is to reinforce the incision slope.

However, the rock bolt reinforcement method causes the rock to weather easily when the incline is exposed to the atmosphere, causing the rock bolt reinforcement to weaken or lose prematurely, causing frequent local collapse and rockfall. In addition, if the joint is developed on the inclined slope, the activities of the joint cannot be completely suppressed, so there is a possibility that the slope is further collapsed, and since there is no medium for connecting the rock bolts, the rock bolt has no choice but to act independently. If the lock bolts are not long enough, there is a risk of large collapse.

In Figure 11, the Soil nail reinforcement method is a slope reinforcement method is mainly applied where the joint is developed in the weathered rock or soil layer is easy to occur shallow surface loss, a hole having a diameter of 50mm in the inclined slope (a) like the rock bolt reinforcement method (b) ) And insert a nail (h) having a diameter of 25 mm, and fill and fix the cement milk (j) in the space around the nail (h), the outer end of the nail (h) exposed by the incision slope (a) It is a method of integrating the whole slope by pouring a shotcrete 1 of about 10 mm in thickness, after placing a 30 x 30 mm pressure plate k into place.

This small nail reinforcement method was originally developed for the purpose of reinforcing upright slopes made of soil, and the rock bolt reinforcement method was omitted by eliminating the shotcrete casting process on the surface in order to integrate the reinforcement structure while applying the method to the cut slope of the rock. It is difficult to increase the stability of the incline in the rock area where the length of the steel bar (nail) or the rock joint is developed.

Like this, the rock bolt reinforcement method and the soil nail reinforcement method are very likely to lead to a large accident that causes a great loss of life and property damage because the collapse occurs instantaneously during the collapse of the slope. Moreover, these conventional inclined slope reinforcement methods have no safety measures against large collapse accidents when applied as a stabilization method for rock incision slopes including faults or large fracture zones. In other words, the conventional inclined slope reinforcement method includes a number of problems in construction and maintenance, and is not a method that can prevent a rockfall accident and a massive collapse accident due to insufficient preparation for sudden collapse or situation.

The biggest problem in incisions is the instability of the slopes due to the numerous joints resulting from rock blasting due to blasting and the rapid development of weathering after air exposure. In this cut slope, in the summer when rainfall is concentrated, the amount of groundwater elution is large due to the gap between the cut surfaces, and it is difficult to stabilize the slopes, and it is also difficult to secure the land and to cut the cut surfaces.

Therefore, it is urgent and urgent to develop a new effective reinforcement method that is effective to solve the problems of the reinforcement method of the existing inclined slope.

An object of the present invention is to secure the stability of the inclined slope by overcoming the limitations of the rock bolt reinforcement method and the soil nail reinforcement method.

The present invention comprises the steps of drilling a hole for the injection pipe into the slope of the reinforcement target section; Entering into the hole an FRP injection tube provided with a spacer for maintaining a gap between the grout material ejection hole and the hole main surface; A caulking step for blocking the perforation hole inlet and the outer wall of the injection pipe and a sealing step for filling the space; The grout material is pressure-injected through the injection pipe, and a part of the grout material is pushed out into the ejection hole to condense and fill the space between the hole and the injection pipe, and some of the grout material penetrates into the gap of the joint surface distributed on the main surface of the hole. Grout material injection step; Laying the wire mesh on the slope after the grout material is cured and laying the wire end network to allow the outer end of the injection pipe to escape between the mesh eyes; Put the pressure plate on the outer end of the injection pipe on the outside of the steel wire net, and install two steel wires in the longitudinal and horizontal direction to deflect the injection pipe, and insert the external anchorage on the outer end of the injection pipe and fasten the liner nut to fix it. It is characterized by stabilizing the slope in the fixing step. In addition, this method can be applied by using the FRP injection pipe as the injection pipe to replace the steel pipe. In addition to using the above-mentioned injection tube, it may be carried out by directly using cement milk or high-strength grout material in the perforated hole or by injecting a specific chemical liquid into a special ground such as a soft ground layer or a landfill layer.

1 is a partial cutaway front view of an FRP injection tube

2 is a cross-sectional view taken along the line A-A, line B-B and line C-C of FIG.

3 is a partial cutaway perspective view of an FRP injection tube according to another embodiment

4 is a perspective view of an FRP injection tube according to another embodiment

5 is a bending strength control graph for the FRP injection pipe of each embodiment

6 is a perspective view of the acupressure plate and the external anchorage and coupler;

7 is a perspective view of a wire mesh

8 is a cross-sectional view of a construction example according to the present invention

9 is a view seen from the direction D of FIG. 8;

10 is a cross-sectional view of the conventional rock bolt reinforcement method

11 is a cross-sectional view of the conventional soil nail reinforcement method

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

1: FRP injection pipe 2: pressure plate

3: external anchorage 4: coupler

5 steel wire 6 steel wire

7: liner nut

9: grout ash

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 9.

The reinforcing material suitable for the present invention is a grout material injection FRP injection pipe (1) and acupressure plate (2), the external anchorage (3) and the steel wire net (5), and when a long drilling hole is connected to the injection pipe short Coupler 4, steel wire 6, and fixing liner nut 7 to be used.

First, FIG. 1 and FIG. 2 relate to the FRP injection pipe 1 for grout material injection. The injection tube 1 serves as a path for supplementing the bearing force of the incision surface, that is, the shear strength and effectively injecting the grout material into the joint surface, and is an FRP. The outer diameter is 30 to 100 mm depending on the construction site. Is 2 to 6 mm depending on the design strength. The grout material ejection hole 12 is drilled on the circumferential wall of the injection pipe 1 at regular intervals in the longitudinal direction, and a spacer 11 is provided where it does not overlap with the ejection hole 12.

The blowing hole 12 is drilled, for example, with a hole diameter of 3 mm to 5 mm and a space distance of 1000 mm. The ejection hole 12 is a part of the grout material injected in the process of injecting the grout material into the hole drilled in the ground and then injecting the grout material into the gap, the gap between the hole and the injection pipe (1) It is necessary to fill the gap and penetrate into the gap of the joint surface to be filled. In addition, the ejection hole 12 is punched crosswise in each step so that the grout material is ejected quickly and evenly around the injection pipe 1 in all directions.

Glass fiber reinforced pipe (FRP) is lighter than aluminum and, unlike metals, has excellent strength as a permanent material with high corrosion resistance and has the advantage of a material widely used in various fields. The grout material injection pipe 1 is to take advantage of this FRP as it is.

That is, the FRP injection pipe 1 is a thermosetting unsaturated polyester such as glass fiber, carbon fiber, aramid fiber, boron fiber, or general textile paper, and when high strength is required, it is impregnated with liquid curable resin such as TPA resin or epoxy resin. A long hardened resin impregnated reinforcing fiber (1a) was wound on an iron rod, a resin rod, an iron pipe, and a resin control mandrel according to the designed thickness to form a glass fiber reinforced pipe, and TPA resin was formed on the surface of the glass fiber reinforced pipe. Filament yarns 1b, such as glass yarn, carbon yarn, aramid yarn, and boron yarn, impregnated with a liquid curable resin such as epoxy resin, etc., are wound on a filament winding, and the bending strength of the glass fiber reinforced pipe Complement the recoverability, by heating the resin impregnated filament yarn odors with a mandrel at 100-200 ℃ for 1 to 4 hours using a heating means such as an electric oven, steam oven After the screen is normalized by removing the rough cutting both end portions of the FRP pipe obtained by cooling to ambient temperature and stripping the mandrel.

Or in Figure 3, the steel wire 6 of the same thickness and length on the outer surface of the glass fiber reinforced pipe is arranged in the axial or mesh shape and bonded using the adhesive force of the resin to compensate for the longitudinal rigidity, The steel-reinforced FRP injection pipe 1-1 which wound the hardened resin-impregnated filament yarn 1b on the outer surface of the steel wire 6 by heating in the above-mentioned manner, removed the mandrel, and arranged the rough end part.

In Figure 4, the glass fiber reinforced pipe injection pipe (1-2) according to another embodiment is placed in the axial or mesh shape by placing the steel wire 6 of several strands in the hollow of the glass fiber reinforced pipe It was hardened by filling the ash (8).

As an example other than the above embodiment, the cured resin-impregnated filament yarn is wound around the outer surface of the glass fiber reinforced pipe 1a in which the cured resin-impregnated reinforcing fiber is wound with a rod without a hollow, and is used after heat curing or without hollow. There is also a method of arranging steel wires in the axial or mesh shape outside the glass fiber reinforced pipe 1a and winding the cured resin-impregnated filament yarn in a twill form to use it after heat curing. It is a graph comparing the bending strength of the obtained injection pipe (1,1-1,1-2). In this graph, the load-by-load displacement of the steel pre-filled injection pipes 1-1 and 1-2 is superior to that of the injection pipe 1 without steel embedded, and the surface of the glass fiber reinforced pipe and the hardened resin-impregnated filament yarn It can be confirmed that the injection pipe 1-1 in which 6 or more steel wires 6 are embedded in between is much higher in strength than the injection pipe 1-2 in which the four strands of steel wire 6 are contained.

In any embodiment, the spacer 11 is always separated from the inner surface of the drilling hole by the projection height when the injection pipe 1 is inserted into the drilling hole. 12) to prevent clogging and to be located in the center of the drilling hole as much as possible to increase anchoring force and stress center in the ground by the grout material ejected around the injection pipe 1 through the ejection hole 12 during grouting It is to prevent the deflection of the.

The spacer 11 also protects the rubber ring 10, which is a counter flow prevention means for the ejection hole 12, from coming into contact with the rough inner surface of the drilling hole when the injection tube 1 is inserted into the drilling hole so that it is not peeled or damaged. At the same time, when the ejection hole 12 is blocked, the blockage due to the unauthorized inflow of the cutting soil in the drilling hole is prevented.

The injection pipe 1 may be provided with an external screw 13 so as to be easily connected with a coupler having a female thread at both ends, and both injection pipes 1 are connected to the coupler in series without screwing, or depending on the situation, The injection tube can also be joined with an adhesive.

The spacer 11 has a uniform thickness around the injection tube 1 by placing the injection tube 1 close to the concentric circle when the injection tube 1 enters a hole drilled in the ground of the slope section. As the grout layer is formed, a separate ring is made and fitted at equal intervals or integrated during control.

In FIG. 6, the pressure plate 2 is inserted into the outer end of the injection pipe 1 so that the fixing force by the injection pipe 1 is uniformly distributed in all directions through the wire net 5, and has a diameter of 300 to 500 mm. It is a thick plate made of a plate, and the center of the plate surface is a hole 21 for insertion into the injection pipe (1).

The external fixing unit 3 presses the pressure plate 2 inserted in the outer end of the injection tube 1 and stabilizes the wire mesh 5 with a fixing force applied to the injection tube 1 exerted after the cement milk injection. 5) to support the steel wire extending in the orthogonal direction on the acupressure plate (2) at the same time to apply the fixing force, the hole in the center of the plate surface 31 to be fitted to the outer end of the injection pipe (1) perforated and muddy In the orthogonal direction, the steel wire groove 32 through which two steel wires can pass, respectively, is machined.

The coupler 4 is a connector for connecting and using the injection tube 1 in the longitudinal direction, and has an internal thread 41 corresponding to the external thread 13 on the inner circumferential surface thereof.

In FIG. 7, the steel wire 5 is spread over the slope so that the outer end of the injection pipe 1 exposed to the slope of the reinforcing work section penetrates to stabilize the slope by the fixing force by the injection pipe 1 after the grout material is injected. It is a corrosion resistant soft liner net. The soft wire network 5 absorbs decay energy by elongation even when a collapse occurs, thereby contributing to minimizing life and property damage.

Next, a construction method of reinforcing the slope using the reinforcing material and the grout material will be described with reference to FIGS. 8 and 9.

First step

On the slope (a) of the reinforcement section, the downward diagonal hole (b) is drilled in the longitudinal grid direction.

2nd step

The injection pipe 1 which fitted the length of the said hole b is put in. The injection tube 1 which enters into the hole b is generally located close to the concentric circle by the spacer 11. At this time, the injection pipe 1 is exposed to the outer end 13 of the outer end of the outer end (a) of the liner nut (7) in the state of being fitted in the order of the wire mesh 5, the pressure plate (2), the external anchorage (3). ) To be fixed.

3rd step

The grout material 15 is pressure-injected into the injection pipe 1. The grout material 15 to be injected is gradually filled from the tip of the hole b while a part of the grout material exits the ejection hole 12 and is filled in the space formed between the hole b and the injection tube 1 and thus filled with grout. A part of the ash 15 is also filled and penetrated into the gap of the joint surface scattered around the hole b. This grout material filling proceeds until it reaches near the inlet of the hole b.

4th step

The inlet of the hole (b) is blocked by the caulking material 14 to prevent external moisture from penetrating into the hole (b) and to allow the grout material 15 to completely cure.

5th step

After the grout material 15 is cured, the steel wire 5 is laid throughout the slope b. At this time, the outer end of the injection pipe (1) is located between the wire mesh. Insert the pressure plate 2 at the outer ends of all the exposed pipes 1 of the steel wire net 5 and insert the steel wires 6 each of two strands horizontally and horizontally into the injection pipe 1 on the pressure plate 2. After the end is hypothesized to be deflected from side to side or up and down, the external fixing device 3 is fitted and the liner nut 7 is fastened to the external screw 13 to fix it.

When reinforcing the slope in this manner, the wire mesh 5 has a fixation force of the injection pipe 1 serving as a grout anchor via the liner nut 7, the external anchorage 3, and the pressure plate 2. It is evenly dispersed in (5) to stabilize the slope.

After construction, the steel wire net (5) can also be used as a support net for mounting artificial soil mixed with herbal seeds and a safety net for herbal planting.

As described above, the present invention is an internal fixation force is generated by the hardened grout material after being injected into the infusion tube, and it is stabilized and protected by a wire mesh using this fixing force. Compared to the conventional rock bolt reinforcement method and the soil nail reinforcement method, which were only stabilization effects, the slope stability effect is very excellent and powerful. This can greatly reduce the lives and property damage caused by collapses or events.

In addition, since the non-fixed part of the steel wire net is supported by the steel wire, the stability of the slope is improved. Even if a partial collapse or event occurs, the sudden elongation of the wire can prevent the sudden collapse or event, so that there is sufficient time to deal with an emergency and to take appropriate action.

It is also possible to install artificial soil mixed with herbaceous seeds using a wire network, in which case premature slope greening is achieved. Thus, the slope reinforcement method of the present invention can be said to be a natural friendly slope reinforcement method.

In addition, the FRP injection pipe is lighter than the steel rods of the rock bolt reinforcement method, and thus has good workability. The steel wire 6 means all iron wires such as steel wires and cast iron wires.

Claims (7)

Drilling a hole for the injection pipe into the slope of the reinforcement section; Inserting into said hole a high-strength FRP injection tube provided with a spacer for maintaining a spacing between a grout material injection jet hole and a hole main surface; A caulking step for blocking the perforation hole inlet and the outer wall of the injection pipe and a sealing step for filling the space; Injecting the grout material through the injection pipe to condense part of the grout material into the space between the drilled hole and the injection pipe through the ejection hole while most of the grout material penetrates into the gap of the joint surface interspersed with the hole main surface. Steps; Laying the wire mesh on the slope after the grout material is cured and laying the wire end mesh to allow the outer end of the injection pipe to escape into the mesh of the corresponding position; Put the pressure plate on the outer end of the injection pipe on the outside of the steel wire net, and install two steel wires in the longitudinal and horizontal direction to deflect the injection pipe, and insert the external anchorage on the outer end of the injection pipe and fasten the liner nut to fix it. Slow-Geo AR reinforcement system, characterized in that to stabilize the slope as a fixing step. According to claim 1, wherein the FRP injection tube is a thermosetting unsaturated polyester such as glass fiber, carbon fiber, aramid fiber, boron fiber, general woven paper, long hardening resin impregnated in liquid curing resin such as TPA resin, epoxy resin The impregnated reinforcing fiber is wrapped in iron rods, resin rods, steel pipes, and resin control mandrel to form a glass fiber reinforced pipe (FRP) according to the designed thickness, and the TPA resin, epoxy resin, etc. Filament yarns, such as glass yarn, carbon yarn, aramid yarn and boron yarn, impregnated with liquid cured resin, are wound on a filament winding to complement the bending strength and resilience of the glass fiber reinforced pipe, and the resin-impregnated filament Slow-Geo FAL, which is made of FRP tube which is cured by heating the odors with mandrel at 100 ~ 200 ℃ for 1 ~ 4 hours and then cooling it. Reinforcement system. According to claim 1, wherein the FRP injection pipe is arranged in the axial direction side by side in the axial direction of the steel wire of the same thickness and length on the outer surface of the glass fiber reinforced pipe to compensate for the longitudinal rigidity by SLP-GFP reinforcement system comprising a steel-reinforced FRP injection tube in which the hardened resin-impregnated filament yarns are wound in a twill form on the outer surface of the steel wire, heated and cured, and then the mandrel is removed. According to claim 1, wherein the FRP injection tube is arranged in the form of a steel wire of several strands of the same thickness and length on the outer surface of the glass fiber reinforced pipe in the form of a mesh to adhere using the adhesive force of the resin to complement the longitudinal rigidity, Slough-GFP reinforcement system made of steel wire reinforced FRP injection tube in which hardened resin-impregnated filament yarns are wound in a twill and heat-hardened, and then the mandrel is removed and the rough ends are arranged. The SRP-GRP reinforcement system according to claim 1, wherein the FRP inlet tube is formed by arranging several strands of steel wire in the hollow of the glass fiber reinforced pipe in an axial direction or in a net shape and hardening by filling with grout material. The SRP-GRP reinforcement system according to claim 1, wherein the FRP injection tube is formed by hardening a plurality of strands of steel wire in the axial direction and filling the grout in the glass fiber reinforced pipe. Drilling a hole for the injection pipe into the slope of the reinforcement section; Inserting into said hole a high strength steel pipe or steel bar provided with a spacer for maintaining a gap between the injection hole for injection of grout material and the main surface of the hole; A caulking step for blocking the perforation hole inlet and the outer wall of the injection pipe and a sealing step for filling the space; Injecting the grout material through the injection pipe to condense part of the grout material into the space between the drilled hole and the injection pipe through the ejection hole while most of the grout material penetrates into the gap of the joint surface interspersed with the hole main surface. Steps; Laying the wire mesh on the slope after the grout material is cured and laying the wire end mesh to allow the outer end of the injection pipe to escape into the mesh of the corresponding position; Put the pressure plate on the outer end of the injection pipe on the outside of the steel wire net, and install two steel wires in the longitudinal and horizontal direction to deflect the injection pipe, and insert the external anchorage on the outer end of the injection pipe and fasten the liner nut to fix it. Slow-Geo AR reinforcement system, characterized in that to stabilize the slope as a fixing step.