KR20110045279A - Prevention method of construction for slope land collapse - Google Patents

Abstract

PURPOSE: A collapse prevention construction method for a slope is provided to achieve fast drainage of water and soil reinforcement at a slope by employing porous slope failure protectors with high strength. CONSTITUTION: A collapse prevention construction method for a slope is as follows. A guide pipe(5) is installed in the soil of a slope. A high-speed water jet rod(4) is inserted and rotated through the guide pipe and high-speed water is injected to drill an upwardly inclined hole into the soil. High-speed water(W2) is injected through a lateral injection nozzle(8), which is installed perpendicular to the longitudinal direction of the high-speed water jet rod on the leading end of the high-speed water jet rod, to expand the drilled hole and form a space(9) for filling. The high-speed water jet rod is removed from the space and a filler injection pipe is inserted. A filler is injected through the filler injection pipe and hardened to form a porous slope failure protector.

Description

Prevention method of construction for slope land collapse}

The present invention relates to a slope collapse prevention method, and more particularly to a slope collapse prevention method for preventing the fall of sloped soil, such as an incision in the construction of roads and the like fall down due to rainfall.

There are many natural or artificial slopes on the ground, and the slopes of these slopes are often collapsed in many places due to natural phenomena such as earthquakes, rainfall, snowfall, and strong winds. This is due to the phenomenon that water penetrates into the ground and saturates the soil (see FIG. 8).

However, when water penetrates into the soil of the slope (including weathered soil and weathered rock) or artificial land (these are all called slope soils) by rainfall and snowfall, the soil becomes saturated. When the saturation increases, the unit weight increases a lot, and accordingly, the force for sliding down the slope, that is, the active force, increases, and when the soil is saturated, the ground strength, As the cohesion and frictional forces become smaller, the slope action resistance generated by the combination of these becomes smaller, so when the soil is saturated, the sliding power to slide down the slope rather than in the dry state Becomes large, and the resistance to resist is inversely small, causing collapse easily on the slope.

In order to solve such problems, the slope collapse prevention method, which is conventionally constructed, is designed to prevent a slope soil activity by inserting a plurality of piles or drain pipes at regular intervals over the entire surface of an inclined slope soil such as an incision. Various construction methods are being constructed. Among them, typical construction methods include a large diameter (1.0 to 3.0m) concrete or steel pile that is driven through the active surface (S) to suppress the activity of the sloped soil by the force. (See Fig. 9), the small diameter (10 ~ 15cm) hole was drilled to pass through the active surface, the reinforcing bars or steel rods are installed therein, and the small diameter pile by filling the remaining space with cement paste (cement paste), etc. Construction method to suppress the activity of the slope soil (see Fig. 10), install a ground anchor penetrating the active surface on the slope soil The method of inhibiting the activity of the sloped soil by using the increased frictional force obtained by tensioning it and the tension of the tension material (mainly PC steel wire) (see FIG. 11), and the hole of the small diameter (diameter 10-15 cm) on the slope Perforated to a predetermined depth upwards than the horizontal, iron or PVC perforated pipes or PVC bundles are inserted in the ground to quickly discharge the groundwater to the outside to prevent the slope soil from saturating the slope resistance resistance The method (refer FIG. 12) etc. which do not collapse is mentioned.

However, in the case of the construction to prevent the collapse of the sloped soil of the slope by adopting the conventional inclined brass low-blocking method as described above, especially when the slope soil active surface of the slope is deeply located, the surface soil of the slope is much saturated In the case where water is present, there is a problem that the saturated water can be drained quickly so that the drop in effective slope resistance can not be effectively prevented.

The present invention has been made in view of the problems of the conventional slope activity preventing methods as described above, and injects a plurality of guide pipes at regular intervals in all directions to the inclined surface portions of the slopes to be constructed, through each of these guide pipes. Injection of high speed water through the forward injection high-speed water supply path in the double pipe while inserting a high-speed water injection rod consisting of a double pipe having passages for supplying forward injection and lateral injection high speed water from the high-pressure pump inclined upwardly than horizontally. And by rotating the high speed water injection rod to drill by cutting by a drill bit installed at the front end of the high speed water injection rod, and then block the forward injection high speed water supply passage and open the side injection high speed water supply passage to supply the high pressure pump. Spray nozzle installed in a direction perpendicular to the longitudinal direction of the spray rod The high speed water is sprayed through the ground to cut and crush the surrounding ground, and discharge it with the fluid to the outside.The spraying rod is sprayed while swinging from side to side in an angle range of 180 ° or less from the horizontal direction. After the expansion, the filling space is inserted into the expanded space instead of the high-speed water injection rod, and the filling material made of foam cement concrete, etc. is filled and filled, and then hardened. It is designed to stabilize the inclined surface by forming an extremely high slope resistance resistor.

In other words, the present invention is drilled to a predetermined depth to several depths in various places on the slope of the area where the activity is concerned or already active, but the cross section is large (rotation radius 30cm or more to 200cm, by structural dynamic calculation By drilling and expanding to create a fan-shaped space, and filling the material with permeability and greater strength than the sloped soil in the formed space to form slope resistance resistors. In addition, due to the rapid drainage through the numerous voids formed in the porous slope-resistance having a fan-shaped cross section, and the high strength of the slope-resistor, it is possible to prevent the weakening of the slope soil and increase the structural dynamic resistance. It is supposed to be.

According to the present invention, the porous slope activity resistor formed by filling a material having a larger permeability coefficient than the sloped soil and having a greater strength than the sloped soil so as to face up to a predetermined depth in various slopes of the area where the activity is concerned or already occurred. Due to the rapid drainage through the internal voids and the great strength of the slope resistance resistor, the role of preventing the weakening of the slope soil and increasing the structural dynamic resistance can be achieved.

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

FIG. 1 is a view for explaining a drilling step of drilling at a depth (depth) necessary for inclined surface soil of an inclined surface. First, a plurality of guide pipes 5 for guiding a direction in which the high-speed water injection rod 4 proceeds while puncturing is installed in the required number over the entire surface corresponding to the inclined soil to be installed. The direction in which the guide pipe 5 is embedded in the inclined slope soil G is determined in consideration of the traveling direction of the high-speed water jetting rod 4 used for the following work, and is generally upwards than the horizontal direction. Do it.

Subsequently, the high-speed water injection rod 4 for drilling and expanding the inclined soil G through the guide pipe 5 is inserted while drilling. That is, the high speed water jetting rod 4 is guided by the guide pipe 5 and receives the high speed water (water, water + air, air, other fluids) supplied from the high pressure pump 1 (4). Forward injection is performed at high speed (for example, sound speed or more) through the drilling high-speed water injection nozzle 7 mounted at the tip of the bar. By simultaneous with the cutting action by the drill bit (6) provided at the tip of the high-speed water injection rod (4) by the injection of the high-speed injection water and the cutting action by the drill bit (6) As a result, the soil is crushed and the process proceeds forward to pierce the soil. In this case, the crushed ground soil is mixed with the used high pressure water and passes through the space formed outside the high pressure water injection rod 4 and then discharged to the outside through the high pressure water injection rod 4 and the guide pipe 5. do.

That is, the high-pressure pump 1 for high-speed water injection of a drilling equipment (not shown) is inserted into the inclined surface by installing the guide pipe 5 and inserting the tip of the high-speed water injection rod 4 into the guide pipe 5. from being sent through the high pressure water supply hose (2) swivel 3 is at a high speed while rotating, as shown a high-speed water injection rod 4 as shown in the figure the number of high-speed front jet (W ₁₎ by the arrow To be sprayed. At this time, the entry direction of the high-speed water injection rod 4 is made to be drilled by proceeding to the required depth in a state to be upward (horizontal + θ ₁ ) than the horizontal. The perforation is made to be higher than the horizontal, in order to allow the water collected from the inclined soil (G) to flow out to the outside in the state of injecting the filler 13 which is the last step of the process according to the present invention. In this way, the direction of the holes to be drilled is made upward by θ ₁ than the horizontal direction by making the direction in which the guide pipe 5 is driven upwards than horizontal.

The high speed water jetting rod 4 has a passage for supplying the forward injection high speed water W ₁ for drilling at its center position, and supplies the side injection high speed water W ₂ for expansion in the outside. It is in the form of a double pipe in which a passage is arranged, and at the tip thereof, the front soil is pulverized in accordance with the rotation of the rod and the high-speed water jetting nozzle (7) connected to the passage for supplying the forward water for injection for the drilling. While the drill bit 6 for cutting is provided, the expansion high-speed water jet nozzle 8 which is connected to the side injection feed water passage for expansion is provided, and the expansion jet nozzle 8 ) Is connected to the high pressure pump (1) of the drilling equipment through the swivel (3) and the hose (2) has a structure that receives the high pressure water, respectively. In the high-speed water jetting rod 4, high-pressure water for drilling is supplied through a passage for supplying the high-speed injection water W ₁ for drilling, and the high-speed spraying side water W ₂ for expanding is provided. The supply of the high pressure water for expansion through the passage for supplying is to select the high pressure water supplied from the high pressure pump 1 by operating a switching means by a high pressure water supply composed of a valve.

2 is a view for explaining the expansion step in the present invention. When the drilling is completed as described above, the high-speed water (W ₂ ) through the side injection nozzle (8) provided at the tip of the high-speed water jetting rod (4) at right angles to the longitudinal direction of the high-speed water jetting rod (4). ) To expand the perforated portion in the drilling step, so that a space 9 for filling the filler 13 to be constructed in the next step is formed. This reverses the high-speed water jetting rod 4 in the state where it has entered the required depth in the drilling step, while at the same time leaving an angle of θ ₂ from both sides with respect to the horizontal as viewed from the front, as shown in FIG. 3, That is, by swinging the high speed water injection rod 4 from side to side as indicated by the arrow in FIG. 2 in the angle range of (180 °-2θ ₂ ), the fan-shaped space 9 is enlarged and symmetrically inside the sloped soil. Will be formed. This can be done either backwards or forwards, depending on the site situation. Forming a space at an angle of (180 ° -2θ ₂ ) with respect to the horizontal is the discharge of the crushed ground soil and high-pressure water generated in the expansion step, and the porous slope brass resistor 16 after the construction is completed This is to collect the water collected in the enlarged portion corresponding to the formed portion to the guide pipe (5) to smoothly discharge to the outside.

On the other hand, by drilling and cutting the drill bit 6 for the above-mentioned drilling and high-speed water injection through the high-speed water injection nozzle 7 to drill in the inclined surface soil (G), or the side injection nozzle (8) As the equipment used for the expansion by using, a well-known drilling equipment equipped with a high-pressure pump (1) which is widely used in soft ground reinforcement work or tunnel construction, etc. is used. A supply path switching means for switching the supply path of the water injection and supplying the high speed water to the required supply path is provided.

3 is a cross-sectional view of what has been described with reference to FIG. 2 as viewed from the front. From the contents shown in FIG. 3, as described above, the high-pressure water jetting rod 4 swings left and right to a position that leaves angles of θ ₂ on both sides above the horizontal line, thereby allowing high-speed water (W ₂ to be injected laterally). Indicates that the fan-shaped space 9 is formed in the slope soil G. As shown in FIG.

4 and 5 are diagrams for explaining the step of injecting the filler 13 in the expanded space (9). After expansion, the high-speed water injection rod 4 is removed from the enlarged space 9, and a filler injection tube 11 for inserting the filler 13 is inserted instead. The filler injection pipe 11 is connected to the grout pump 10 via the swivel 3 'and the hose 2', which is basically the same as the drilling equipment used in the drilling and expansion steps. However, the filler injection pipe 11 and the swivel 3 ', the hose 2', and the grout pump 10, which are configured to inject the high pressure water into the filler instead of the high pressure pump associated with the injection rod 4, It is only different that it is intended to be used.

In the step of injecting the filler material 13 into the space 9, the filler injection tube 11 is first inserted into the enlarged portion through the guide pipe 5, and then the filler injection tube 11 and the guide pipe 5 are filled. After sealing the inside with a packer (packer 12), the filler 13 suitable for the purpose is inject | poured using the grout pump 10 according to the volume of the enlarged space 9. After the filling is finished and the space 9 is filled with the filler 13, the filler inlet tube 11 and the packer 12 are removed. If the filler 13 is fluid, it may be removed until curing occurs. As shown in FIG. 5, a stopper 15 is temporarily prepared to block the inlet of the guide pipe 5. In this case, as illustrated by a dotted line in FIG. 4, the injection hole 14 may be drilled to check the state of the slope active resistor 16 formed by curing the filler 13.

Here, as the filler 13 for filling and filling the expanded space 9, foamed cement concrete, foamed cement mortar, foamed cement paste may be mainly used. In addition, glass-fiber-reinforced plastics containing a foaming agent, urethane series, Biological materials (cut to pulverized corn, rice straw, etc.), and other chemically injected foam chemicals may be used in combination.

When the bubble cement concrete or the like is filled in the space 9 as the filler 13 to be cured, the porous slope active resistor 16 having numerous pores therein is formed by bubbles of the hardened bubble cement concrete. The groundwater, which is contained in the slope slope soil by rain or the like, flows toward the slope activity resistor 16 through the pores inside the porous slope resistance resistor 16 to be collected and then flows toward the guide pipe 5. That is, the pores in the porous slope-activator antibody having a fan-shaped cross section serves as a flow path through which groundwater is discharged out of the ground surface.

6 is a cross-sectional view showing a columnar porous slope-active resistor 16 having a fan-shaped cross section in which the filler 13 is cured after the above steps. As can be seen in the figure, the groundwater such as the water contained in the inclined surface soil G due to rainfall or the like, the internal voids of the porous slope-resistance body 16, the cross section formed by the hardening of the filling material 13 is formed into a fan shape. Through the guide pipe (5) and then out of the ground surface through the guide pipe (5). Then, since both left and right sides of the slope resistance resistor 16 are inclined at an angle of θ ₂ horizontally, water flowing through the voids in the slope resistance resistor 16 is collected at the lower edge of the fan shape. On the other hand, as shown in FIG. 4, since the lower portion of the slope resistor 16 is inclined toward the guide pipe 5 at an angle of ₁ with respect to the horizontal, the groundwater flowing in the slope resistor 16 is guide pipe ( To 5).

As described above, in the slope collapse prevention method according to the present invention, by drilling and expanding the hole at an angle of θ ₁ from the horizontal side, the slurry produced during drilling and expansion is smoothly discharged. Later, the groundwater can be discharged smoothly. On the other hand, the construction leaving both sides at an angle of θ ₂ with respect to the horizontal from the front can smoothly discharge the slurry generated during construction and discharge the groundwater after completion.

On the other hand, in the present invention, by selectively using the material to be filled may be a construction exhibiting only the slope activity resistance, it can be made to play only the role of groundwater drainage.

Therefore, as shown in FIG. 7, when the slope slope collapse prevention method according to the present invention is constructed, the slope activity resistor 16 formed in the shape of a fan-shaped column in the slope slope of the target object to be built in a plurality of up, down, left and right By doing so, the activity resistance of the active surface (S) can be significantly increased, and the rapid drainage of groundwater that has penetrated into the inclined soil through the slope resistance resistor (16) having a large permeability coefficient is achieved, effectively breaking down the slope of the slope. It becomes possible to exercise.

1 is a view for explaining a drilling step for drilling to the depth required for the slope soil.

2 is a view for explaining the expansion step of the present invention.

3 is a view of the expansion step of FIG.

4 is a view for explaining a step of injecting a filler into the expanded portion.

FIG. 5 is a view of a state in which a temporary stopper is closed at the end of the guide pipe after the filler injection in FIG. 4 is finished. FIG.

FIG. 6 is a cross-sectional view showing a columnar slope resistance resistor in which a filler is cured. FIG.

Fig. 7 is an explanatory diagram for showing the effect when the construction is performed by the slope collapse prevention method of the present invention.

FIG. 8 is a diagram for illustrating the principle in the case where the ground works in a state where the slope collapse prevention method is not constructed.

9 is a view showing one example of a conventional slope collapse prevention method.

10 is a view showing another example of the conventional slope collapse prevention method.

11 is a view showing still another example in the conventional slope collapse prevention method.

12 is a view showing still another example of the conventional slope collapse prevention method.

-Explanation of symbols for the main parts of the drawings-

1----High Pressure Pump

2----(for high speed water supply) hose

2 '----(for filling filler) hose

3----Swivel (for high speed jet rod)

3 '----(for filler injection rod) Swivel

4----High Speed Water Jet Rod

5----Guide Pipe

6----Drill bit

7----Front injection nozzle

8----Side injection nozzle

9----Space

10----grout pump,

11----Filling tube

12----Packer

13----Filling Material

14----Inspector

15----Spigot

16----Slope Resistor

Claims (2)

In the slope collapse prevention method to prevent the slope slope activity by installing a plurality of structures having slope activity resistance on the slope to meet the construction area, Set the drilling direction on the inclined surface of the projected slope, and install the guide pipe to be directed upward than the horizontal to guide the direction in which the double pipe type high speed jetting rod having the front injection supply side and the side injection supply passage enters. To do that, The high speed water injection rod is rotated while entering through the guide pipe upwardly (180 ° + θ ₁ ), thereby cutting the inclined soil by a drill bit mounted at the tip of the high speed water injection rod. Spraying the high speed water supplied through the forward injection high speed water supply path by the high speed jet water jet nozzle to the front, and drilling the required depth on the inclined soil; Retracting the high speed water supplied through the lateral injection high speed water supply path of the high speed water injection rod through the injection nozzle installed at the tip of the high speed water injection rod in a direction perpendicular to the longitudinal direction of the high speed water injection rod. And discharged to the outside together with the high speed water used while cutting and breaking the periphery of the high speed water injection rod in the ground, so that the rotation angle of the high speed water injection rod is equal to or less than horizontal (180 ° -2θ ₂ ). Expanding to form a space of shape, Removing the high-pressure water injection rod from the enlarged space and inserting a filler injection tube instead and injecting filler through the filler injection tube to fill and fill the space having a fan-shaped cross section; After the filling is completed, the filler filling tube is removed and then closed with a temporary stopper of the inlet rule of the guide pipe to cure the filler filled in the fan-shaped space to form a porous slope active resistor having many voids formed therein. Slope collapse prevention method to use. The method of claim 1, wherein the filling material filled in the space having a fan-shaped cross section has a high permeability coefficient and high strength, such as foam cement concrete, foam cement mortar, foam cement paste, foam material containing foam material, and hardening occurs. The slope fall prevention method characterized in that the groundwater is a material that can be quickly drained through the interior voids.

Images