KR100608502B1 - Anchor structure for stabilizing cut slope using steel pipe and pack and construction method - Google Patents

Abstract

In the anchoring structure construction method for stabilizing the cut slope using the steel pipe and the pack according to the present invention, by installing a scaffold frame at the lower end of the cut slope of the road to measure the position and angle to be drilled, the anchoring hole Drilling to the planned depth; Sealing the inlet of the pack after inserting a portion in which the injection hole for discharging the injection material of the steel pipe in which a plurality of holes for discharging the injection material are formed from one end of the body to a predetermined area is formed in the pack; Inserting the pack installation portion of the steel pipe in which the pack is installed into the perforation hole of the cut slope and applying mortar to the periphery of the perforation hole entrance; Static pressure injection (primary injection) of a predetermined injection material into a natural pressure in the space inside the perforation hole between the exposed other end of the steel pipe and the pack installed in the steel pipe; After solidifying the injection material according to the first injection, injecting the injection material at a predetermined pressure into the pack provided at the end of the steel pipe through the exposed end of the steel pipe (second injection); And after the injection material is solidified according to the secondary injection, finishing the surface by surrounding the injection hole of the steel pipe.

According to the present invention, while using a steel pipe as an anchor, by inserting a woody grout material into the ground fiber pack of geosynthetic material installed at the end of the steel pipe to form a solid bulb in the ground to create a solid anchorage to the strength of the cut slope There is an advantage to maintain and stabilize the slope.

Description

Method for constructing anchors to the slope of a road using steel pipe and pack}             

1 is a view schematically showing a state in which the anchor is installed on the cut slope according to the construction method of the anchoring structure for the stability of the cut slope using the steel pipe and pack according to the present invention.

FIG. 2 is a partial excerpt detail of the anchor periphery in FIG. 1; FIG.

3 is a view showing the internal structure of the cap nut fastened to the steel pipe inlet in FIG.

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

100 ... road 110 ... cut slope

110h ... hole 120.steel pipe

120 h ... Injection material discharge hole 122 ... Socket

124 ... band 125 ... separate pack

126 ... spacer 130 ... pack (WGS pack)

140.cement mortar 142steel plate

144 Cap nut 146 Injection hose

148 ... pressure gauge

The present invention relates to a method of constructing an anchoring structure for stabilizing cut slopes using steel pipes and packs, in particular using a steel pipe instead of using a steel bar (steel bar), but at the end of the steel pipe Steel pipes and packs can be made by injecting wedge grout material into the installed geotextiles WGS pack to form solid bulbs in the ground to create a firm anchorage to maintain cut strength and stabilize slopes. It relates to an anchoring structure construction method for the stability of the cut slope used.

Generally, the cut slope created by cutting the hillside for new road construction, or on slopes existing on one or both sides of the existing road, the slope of the slope during the summer heavy rain or flood, They become vulnerable and often cause collapses on slopes such as rocks or landslides. Therefore, in order to cope with this to reinforce the ground of the slope, the anchor method using a steel bar (steel bar) is usually used. However, the conventional anchor method using a steel bar has a problem that it is difficult to form a reliable bulb, and the loss and separation of the injection material occurs due to the flow rate of the groundwater, it is difficult to keep the strength of the slope continuously stable.

The present invention was created in view of the above, by using a steel pipe and a pack to form a solid bulb in the ground to create a solid anchorage to maintain the strength of the cut slope and to stabilize the slope using the steel pipe and pack An object of the present invention is to provide an anchoring structure construction method for stabilizing cut slopes.

In order to achieve the above object, the anchoring structure construction method for stabilizing the cut slope using the steel pipe and the pack according to the present invention, in the method of anchoring the cut slope for stabilization of the cut slope formed in accordance with the establishment of the road,

(A) installing a scaffold frame at the lower end of the cut slope to measure the position and angle to be drilled by the measurement, and drilling the anchoring hole to the planned depth;

(b) sealing an inlet of the pack after inserting a portion of the steel pipe in which a plurality of holes for discharging the injection material are formed from one end of the body to a predetermined area for discharging the injection material is formed in the pack;

(c) inserting the pack installation portion of the steel pipe in which the pack is installed into the perforation hole of the cut slope drilled in the step (a) and applying mortar to the periphery of the perforation hole;

(d) positive pressure injection (primary injection) of a predetermined injection material into a natural pressure in the inner space of the drilling hole between the exposed other end of the steel pipe and the pack installed in the steel pipe;

(e) injecting the injection material at a predetermined pressure into the pack provided at the end of the steel pipe through the exposed end of the steel pipe after the solidification of the injection material according to the first injection (second injection); And

(f) after the injection material is solidified according to the secondary injection, characterized in that it comprises the step of finishing the surface of the injection port peripheral portion of the steel pipe.

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

1 and 2 show the outline of the construction of the anchor according to the anchoring structure construction method for the stability of the cut slope using the steel pipe and pack according to the present invention, Figure 1 is a construction method of the present invention on the cut slope PS-Anchor is a view showing the overall overview of the construction, Figure 2 is a partial excerpt detail for the anchor peripheral portion.

1 and 2, an anchoring structure construction method (also called PS (Pack Steel Pipe) Anchor construction method) for stabilizing cut slopes using steel pipes and packs according to the present invention, such as the establishment of road 101 In the method of anchoring the cut slope 110 for stabilization of the cut slope 110 formed according to the above, firstly, a scaffolding frame is formed at the lower end of the cut slope 110 to measure a position and an angle to be drilled. C), and drills a hole 110h for the anchoring to the planned depth. At this time, using a crawler drill (crawler drill) and the like to accurately drill to the planned depth. Preferably, spacers 126 are further provided at several points inside the drilling holes 110h for more stable support of the inner wall surface of the drilling holes 110h.

When the drilling operation of the anchoring drilling hole on the cut slope 110 is completed, the injection material discharge of the steel pipe 120 is formed with a plurality of injection material discharge holes 120h for discharging the injection material from one end of the body to the other end to a certain area The part where the ball 120h is formed is put in the pack 130, and the inlet of the pack 130 is sealed. Here, the steel pipe 120 is preferably a WGS pipe (WGS pipe) is a ready-made product made by drilling a plurality of holes having a diameter of 3mm in a predetermined area of the steel pipe body in a 50mm diameter steel pipe. This Uji's pipe is a unit pipe product standardized to 1m, 2m, etc. so that the overall length can be properly adjusted as needed. Threads are formed at both ends of the pipe so that the pipes 122 can be connected easily by connecting sockets 122 there. Or, by fastening a specific nut member to the other one end, the end can be finished or treated in a desired form. In addition, the pack 130 is preferably a Uji pack (WGS Pack), which is a ready-made product of Uji's made of geotextile material. Particularly, in sealing the inlet of the pack 130 to the steel pipe 120, a strong adhesive (for example, WGS-100P of Uji's Co., Ltd.) is applied to the band 124 so as not to leak even at a pressure of 10 kgf / cm 2 or more. Seal and seal.

In this way, when the assembly of the steel pipe 120 and the pack 130 is completed, the pack installation portion of the steel pipe 120, the pack 130 is installed in the perforated hole (110h) perforated on the cut slope 110 The cement mortar 140 is applied to the inclined surface around the perforation hole 110h.
When the mortar application at the inlet of the boring hole 110h is completed, a predetermined pressure is injected into the internal pressure at a predetermined pressure into the inner space of the boring hole between the injection hole of the steel pipe 120 and the packs 130 and 125 installed in the steel pipe. Primary injection).
In this case, the inlet portion of the steel pipe, which is a space part other than the separate pack 125 and the pack 130 of FIG. 2, and the separate pack 125 and the pack 130 are inserted into the drilling hole 110h. The injection material is poured into a portion between the punching hole 110h and the separate pack 125 and the pack 130 (this is called a static pressure state in which pressure is not introduced). The punching hole 110h is naturally formed by gravity. After filling into the space between the separate pack 125 and the pack 130 and to be filled in the injection portion of the steel pipe (part not installed), and then solidified (primary injection),
The next step is to inject (secondary injection) the injection material at a predetermined pressure into the pack 130 installed at the end of the steel pipe through the exposed end of the steel pipe to inflate the pack 130 to form a bulb.
When the second injection into the pack 130 at a predetermined pressure as described above, the pack 130 is expanded to primarily flow the injection material between the pack 130, 125 and the surface of the drilling hole (110h) to the solidified injection material Close contact with no gaps, it is to be a stronger support when it is solidified to form a bulb.
As described above, the injection material is poured between the inlet portion of the steel pipe and the surface of the drilling hole 110h and the separate pack 125 and the pack 130 are installed, and then solidified and packed more strongly and efficiently at the end of the steel pipe ( 130) to inject the injection material therein,
The steel pipe 120 and the pack 130 at the injection hole of the pack 130 installed at the end of the steel pipe by pressure injection of the injection material in a separate pack 125 of FIG. After acting as a stopper to tightly seal the gap between the inside of the pack (130) is to inject the injection material through a separate steel pipe.
In other words, instead of injecting the injection material into the pack 130 primarily, the pressure is primarily applied to the injection material so as to fill the gap between the injection hole portion of the steel pipe and the packs 130 and 125 and the hole 110h. Pour it naturally without filling it and fill it between the gaps of the packs (130, 125) and the drill hole (110h) by gravity, then solidify it,
Then, the injection material is pressure-injected into the pack 130 installed at the end of the steel pipe so that the pack 130 is inflated and filled in the gap between the pack 130 and 125 and the hole 110h at the first injection. It reinforces the support by forming a bulb while keeping it in close contact with the injection material.

 In addition, the injection material injected at this time, Preferably, the grout material (For example, WGS-100S: grout material product name of Uji's company) which mixed an inorganic material and a miscible material is used.

After the solidification of the injection material by the primary injection, the pack is installed at the end of the steel pipe 120 through the exposed end of the steel pipe 120 (the exposed end serves as an injection port for injection of the injection material). The injection material is injected (secondary injection) at a predetermined pressure inside 130. At this time, as the injection material, a grout material (WGS-100S) in which an inorganic material and a mixed material are mixed as in the case of the first injection is used, and the injection pressure is injected at a constant pressure of 5 to 10 kgf / cm 2. As a result of this injection, the milk of the injection material is oozed from the pack 130, and the milk penetrates into the surrounding joint layer and solidifies to form a mass. As a result, the strength of the ground becomes higher.

When the secondary injection is completed in this way, after the injection material is solidified according to the secondary injection, the work around the injection port of the steel pipe 120 is finished to complete the work. That is, the iron plate 142 is installed on the outer surface of the cement mortar 140, and as shown in FIG. 3, a thread 150 is formed on the inner circumferential surface as a cap shape, and an insertion hole into which the injection hose can be inserted into the cap surface. (149) is a perforated structure, the cap nut (144) is screwed to the end of the steel pipe exposed to the slope portion and the injection hose into the insertion hole formed in the cap portion of the steel pipe 120 The periphery of the inlet is firmly fixed. In FIG. 2, reference numeral 146 denotes an injection hose connecting the inlet of the mortar pump and the steel pipe, and 148 denotes a pressure gauge for measuring the pressure of the injected injection material.

As described above, the anchoring structure construction method for stabilizing the cut slope using the steel pipe and the pack according to the present invention, but instead of using a steel bar (steel bar) as an anchor, The UGS grout material is injected into the geosynthetic UGS pack installed at the end to form a solid bulb in the ground, making it a strong anchorage to maintain the strength of the cut slope and to stabilize the slope. . In addition, the construction is easy and economical construction is possible by using domestic grouting material rather than imported goods.

Claims (10)

In the anchoring structure formed to anchor to the cut slope for stabilization of the cut slope formed in accordance with the establishment of the road, The injection material ejection hole of the steel pipe is installed in the lower end of the cut slope, the hole for boring the anchoring hole to the planned depth, and a plurality of holes for ejection of the injection material from one end of the body to the predetermined area is formed After inserting the formed part into the pack and sealing the inlet of the pack, insert the steel pipe with the pack into the perforated hole drilled on the cut slope, apply mortar to the periphery of the perforated hole, and expose the other end of the steel pipe. And positively inject a predetermined injection material into the inner space of the hole provided between the pack and the pack installed in the steel pipe by natural pressure, and after solidifying the injection material according to the first injection, the exposed portion of the steel pipe through the exposed end of the steel pipe. After the injection of secondary injection material at a predetermined pressure is completed inside the pack installed at the end, the injection material according to the secondary injection is solid After it is, the anchoring structure for stabilization of the cut slope using the steel pipe and the pack, characterized in that formed by the surface of the injection port periphery.        The method of claim 1, The injection material used for the 1st and 2nd injection is a grout material (eg, WGS-100S: grout material product name of Uji's) which is mixed with an inorganic material and a mixed material. An anchoring structure for the stability of the.        The method of claim 1, After the secondary injection, the surface of the inlet periphery of the steel pipe may be cleaned by installing a steel plate on the outer surface of the cement mortar, and having a cap formed on the inner circumferential surface of the cement mortar, and having a perforated insertion hole into which the injection hose may be inserted. An anchoring structure for stabilization of cut slopes using steel pipes and packs, characterized by tightening nuts.        The method of claim 1, The injection pressure of the secondary injection is anchoring structure for the stability of the cut slope using a steel pipe and pack, characterized in that the constant pressure injection at a pressure of 5 ~ 10kgf / ㎠. In the method of anchoring the cut slope to stabilize the cut slope formed according to the construction of the road, (A) installing a scaffold frame at the lower end of the cut slope to measure the position and angle to be drilled by the measurement, and drilling the anchoring hole to the planned depth; (b) sealing an inlet of the pack after inserting a portion of the steel pipe in which a plurality of holes for discharging the injection material are formed from one end of the body to a predetermined area for discharging the injection material is formed in the pack; (c) inserting the pack installation portion of the steel pipe in which the pack is installed into the perforation hole of the cut slope drilled in the step (a) and applying mortar to the periphery of the perforation hole; (d) positive pressure injection (primary injection) of a predetermined injection material into a natural pressure in the inner space of the drilling hole between the exposed other end of the steel pipe and the pack installed in the steel pipe; (e) injecting the injection material at a predetermined pressure into the pack provided at the end of the steel pipe through the exposed end of the steel pipe after the solidification of the injection material according to the first injection (second injection); And (F) after anchoring the injection material according to the secondary injection, anchoring structure construction method for the stability of the cut slope using the steel pipe and pack, characterized in that it comprises the step of finishing the surface of the injection hole of the steel pipe. The method of claim 5, After drilling to the planned depth in the step (a), to stabilize the cut slope using the steel pipe and pack, characterized in that the spacer is further installed in several places inside the drilling hole for more stable support of the inner wall surface of the drilling hole Anchor structure construction method for the. The method of claim 5, The steel pipe in the step (b) is characterized in that a plurality of injection material discharge holes having a diameter of 3mm in a steel pipe of 50mm in diameter is formed in a predetermined region of the body, the ends of the steel pipe is formed using a screw thread An anchoring structure construction method for stabilization of cut slope using steel pipe and pack. The method of claim 5, Before the first injection of the injection material in step (d), injection of injection material using a separate pack is first performed around the sealing area by the band of the pack, and then the injection material is solidified. A method of constructing an anchoring structure for stabilizing cut slopes using a steel pipe and a pack, characterized in that the injection of the injection material into the inner space of the drilling hole. The method of claim 5, In the secondary injection of the injection material in the step (e), the injection pressure is an anchoring structure construction method for the stability of the cut slope using a steel pipe and pack, characterized in that the constant pressure injection at a pressure of 5 ~ 10kgf / ㎠. The method of claim 5, The injection material used for the 1st and 2nd injection | pouring in the said step (d) and (e) is grout material (For example, WGS-100S: grout material product name of Uji's company) which mixed an inorganic material and a mixed material, It is characterized by the above-mentioned. An anchoring structure construction method for stabilization of cut slope using steel pipe and pack.

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