KR100406813B1 - Method and apparatus for mounting lock bolt and lock anchor - Google Patents

Abstract

The present invention relates to a rock bolt and a rock anchor installation device and a method for installing the rock bolt and the rock bolt to increase its rigidity by increasing the frictional force of the rock bolt by high pressure grouting when the rock bolt is installed on rock walls, rocks and earth and sand Its purpose is to provide an anchor installation device and installation method. Rock bolt and lock anchor installation device of the present invention for achieving this purpose, is installed in a predetermined depth position in the insertion hole 11 of the inclined surface 10, the center of the lock bolt 22 and the lock anchor 32 A through hole 16 for inserting, a packer 14 having through holes 18 and 20 formed on both sides of the through hole 16, and an injection hose 24 for injecting mortar into the lower side of the packer 14; ) And an exhaust hose 26 for discharging the lower side air of the packer 14 to the outside, and the lock bolt and the lock anchor using the lock bolt and the lock anchor installation device 12 having such a configuration. In the installation method, the lock bolt 22 and the lock anchor are inserted to a predetermined depth through the through hole 16 of the packer 14, and then mortar is removed from the upper side of the packer 14 by using an expanding agent without pressure. By injection, performing primary grouting; After curing the first grouting, the mortar is injected through the injection hose 24 inserted into the first through hole 18 to perform high pressure secondary grouting on the lower side of the packer 14, thereby filling with high density. To ensure that the lock bolt 22 is installed more firmly; characterized in that consisting of.

Description

Lock bolt and lock anchor installation device and installation method {METHOD AND APPARATUS FOR MOUNTING LOCK BOLT AND LOCK ANCHOR}

The present invention relates to a rock bolt and a lock anchor installation device and a method of installation, and more particularly to the inclined surface adjacent to the road or tunnel construction when the side is prevented from collapsing due to various impacts and windy action, etc. The present invention relates to a rock bolt and a lock anchor installation device and a method for installing the rock bolt and the rock anchor installed in a rock wall, rock, and earth and sand by high pressure grouting to increase its rigidity by increasing frictional force.

In general, there are many sloped roads including rock walls, rocks, earth and sand, and the like, which are open to mountainous terrain, and these roads are exposed to slope collapse from sloped roads.

This slope collapse is a phenomenon that collapses as the support base weakens due to wind and gravitational action, including various impacts and thawing by the earthquake or vehicles traveling on the road.

Therefore, in order to minimize the risk of the collapse of the slope to form a slope at an angle, and also to prevent the falling of the rock and soil from the slope from the slope of the various types of slope stabilization work is being carried out.

Slope stabilization work to prevent such slope collapse phenomenon, the formation of a large number of insertion holes at a depth of about 3 to 5m or more at a predetermined interval on the site of the risk of collapse on the slope, such as rock, such as slopes, A lock bolt having a certain length is inserted into the insertion hole to fill and fix mortar or the like.

The end of the fixed lock bolt is formed to protrude from the surface of the inclined surface, the end of the protruding rock bolt is positioned through the radial support plate having a constant thickness and rigidity, and then mated with the rock bolt As the nut is fastened, the support plate is brought into close contact with the surface of the inclined surface and simultaneously supports the surface of the inclined surface in response to the fastening force between the lock bolt and the nut.

However, when the collapse of a specific part on the inclined zone is intensified, the load due to the collapse is concentrated on the rock bolt reinforcement part of the site, and the rock bolt reinforcement part in which the collapse load is concentrated is deformed or broken by the load and subsequently collapsed. There was a problem that the risk of safety accidents remained, such as loss of support for the rock collapse.

Therefore, the ends of each rock bolt are connected to each other by a wire or reinforcing bars, and the ones are provided to cover each other and to prevent falling rocks and sediment by covering the mesh between each wire and the reinforcing bars. .

However, after simply inserting the hole into the inclined surface and inserting the rock bolt to a certain depth, in the process of filling the mortar, there is no separate mortar outflow restraint means so that the mortar flows backward from the insertion hole to the outside. As it flows out, the density of the rock bolt and the slope decreases due to the decrease in the density thereof, so that it is not possible to maintain a firm fixed state and waste of mortar is caused.

Accordingly, the applicant of the present invention is installed between the lock bolt member and the slope in view of the above problems to allow the injection of the mortar through a separate injection hole in the sealed state of the lock bolt insertion hole, the external leakage of mortar It not only increases the density of mortar which is filled by preventing the mortar, but also increases the bonding force of the rock bolt member that is integrally embedded in the slope by holding the center of the rock bolt so that the mortar injection is performed while maintaining the center of the lock bolt. It has applied for mortar spill prevention device (patent application No. 56578, 1999) for the lock bolt.

The mortar outflow prevention tool for the lock bolt is formed in the center of the prevention tool body formed with a support portion through which the lock bolt is inserted in the center to form a mortar injection hole, forming a sealing portion on the opposite side of the support portion and a sealing ring on the outer surface of the sealing portion It is characterized in that the installation.

In addition, the support portion of the preventive body is characterized in that the packing is provided, it is possible to prevent the external leakage of the mortar filling the inside of the insertion hole formed on the inclined surface during slope stability work on the inclined surface In addition, it is possible to maintain the center of the lock bolt installed into the insertion hole to increase the binding force between the rock bolt and the inclined surface to increase the work efficiency of slope stabilization work.]

Meanwhile, the applicant of the present invention forms an insertion hole divided into a free field portion penetrating a rock and a fixing field portion reaching a ground of a predetermined depth in place of the rock bolt, and a plurality of PC steel wires are inserted into the insertion hole. Each PC steel wire is fixed by a band, and located at the free field part is covered by a tube of synthetic resin material, the sealing is fixed at the boundary of the free field and the anchorage, each PC located at the anchorage site The steel wire is bent between the bands to form a curved shape supported by the side groove of the pedestal through which the injection pipe passes, and the end of each PC steel wire is opened in the fixing cone formed in a container shape opposite to the injection pipe end. For rock collapse prevention consisting of a configuration in which the wire assembly formed by being fastened to the peripheral portion is fixed to the insertion hole is fixed by mortar The lock anchor device and its installation method (patent application 1998-0023590) has been proposed and filed.

The present invention provides a lock bolt and a rock anchor installation device and a method for installing the rock bolt and rock anchor by increasing the frictional force of the rock bolt and the rock anchor by the high pressure grouting when the rock bolt and rock anchor to the rock wall, rock and earth and sand, etc. Its purpose is to.

1 is a view showing a lock bolt installation apparatus and an installation method according to the present invention.

Figure 2 is a view showing a lock anchor installation device and installation method according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10: sloped surface 11: insertion hole

12: lock bolt installation device 14: packer

16: through-hole 18: first through-hole

20: second through hole 22: rock bolt

24: injection hose 26: exhaust hose

32: lock anchor

The lock bolt and the lock anchor installation device of the present invention for achieving this purpose is to be fixedly installed at a predetermined depth position of the plurality of insertion holes formed on the inclined surface to be in close contact with the inner circumferential surface of the insertion hole, and to the center of the lock bolt A packer having a through hole for inserting the lock anchor and having a first through hole and a second through hole formed at both sides of the through hole; An injection hose inserted into the first through hole of the packer and used as a passage for injecting mortar into the lower side of the packer; And an exhaust hose inserted into the second through hole of the packer and used as a passage for discharging the air therein to the outside according to the mortar injection to the lower side of the packer.

In addition, the lock bolt and the lock anchor installation method of the present invention for achieving the above object, the packer is installed at a predetermined depth position of the insertion hole formed on the inclined surface, the lock bolt and the lock anchor through the through hole of the packer constant Carrying out primary grouting by injecting mortar with a swelling agent in a pressureless state on the top side of the packer after insertion into depth; If curing after the first grouting is injected mortar through the injection hose inserted in the first through-hole to perform a high-pressure secondary grouting on the lower side of the packer, so that the lock bolt and the lock anchor is more densely packed To be firmly fixed to install; characterized in that consisting of.

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

1 and 2 is a view showing the installation device and the installation method of the lock bolt and the rock anchor according to the present invention, as shown in Figure 1, in particular, a certain width on the road side slope surface 10 made of soil and sand And the insertion hole 11 is formed to a certain depth, and the packer 14 is inserted into a predetermined depth position of the insertion hole 11 to be divided into two times to grout.

That is, the packer 14 installed at a predetermined depth of the insertion hole 11 formed on the inclined surface 10 made of soil, sand, etc. is formed in a disc shape, and the lock bolt 22 is inserted into the center portion thereof. Through holes 16 are formed, and through holes 18 and 20 of predetermined size are formed on both sides of the through holes 16, respectively.

The through holes 18 and 20 are first through holes 18 through which an injection hose 24 for injecting mortar into the packer 14 is installed, and mortar is injected into the lower side of the packer 14. According to the exhaust hose 26 for discharging the air therein is composed of a second through-hole 20 is installed through.

Therefore, the packer 14 is installed at a predetermined depth position of the insertion hole 11 formed in the inclined surface 10 made of sand, sand, and the like, and the outer circumferential surface of the packer 14 is in close contact with the inner circumferential surface of the insertion hole 11. After it is fixed, the lock bolt 22 is inserted into the through hole 16 of the packer 14 to a predetermined depth, and the mortar injection hose 24 and the air exhaust hose are respectively inserted into the through holes 18 and 20 on both sides. (26) is installed through.

At this time, the injection hose 24 is inserted deeply so that the end is located on the lower side of the insertion hole 11, on the contrary, the exhaust hose 26 is relatively less so that the end is located on the lower surface side of the packer (14) Insert deeply.

Then, the mortar is injected into the upper side of the packer 14, so that there is no shrinkage using an expanding agent, and grouting is performed in a pressureless state.

As such, after confirming that the primary grouting is completed and curing, the secondary grouting is immediately performed after curing.

That is, the mortar is injected into the injection hose 24 so that the mortar flows into the lower side of the packer 14.

Therefore, the air existing in the lower side of the packer 14 is discharged to the outside through the exhaust hose 26 as the mortar is injected, and at this time, when the mortar begins to flow out into the exhaust hose 26, the exhaust hose 26 Block the inlet on the tip side and continue injecting mortar until the pressure of the secondary grouting reaches the design pressure.

The inclined surface 10, which is grouted as described above, has a small coefficient of friction, such as soil and sand, so that the area of the insertion hole 11 expands from the bottom in accordance with the high pressure secondary grouting, and thus the expansion pit of the insertion hole The same effect as the use can be obtained, and the friction force of the rock bolt 22 is increased by the high pressure grouting.

That is, as shown in the direction of the arrow in the area where the pressure is generated in the drawing, the ground field pressure is applied to the free field portion subjected to the first grouting, and the frictional pressure state is inserted into the anchorage portion subjected to the second grouting. As the ball expands, the lock bolt 22 is more firmly mounted by the friction force.

On the other hand, after the first grouting is applied to the tip end side of the insertion hole 11 of the inclined surface 10, the surface of the grouting may be exposed to the outside, and may be covered as a separate packer if necessary.

In addition, such a lock bolt installation device 12 and the installation method can be drilled arbitrarily the depth of the insertion hole 11 of the inclined surface 10, as described above, it is preferable to apply to the inclined surface made of sand and sand Of course, it is also possible to apply to the inclined surface consisting of rock walls, rock, such as wind and soft rock.

On the other hand, as shown in Figure 2, in the case of installing the lock anchor 32 in place of the above-described lock bolt 22 can be installed in the same configuration as above, the installation method is the same.

As described above, according to the rock bolt and the lock anchor installation apparatus of the present invention, and the installation method thereof, the packer is installed by drilling an insertion hole in an inclined surface made of soil, sand, etc., and installing the packer at a predetermined depth of the insertion hole. By performing the first grouting without pressure on the upper side and the second grouting with the high pressure on the lower side of the packer, the mortar is filled with high pressure in the insertion hole of the inclined surface having a large void ratio and a small coefficient of friction. As the density is increased, it is possible to obtain the same effect as the use of the extension pit, whereby the lock bolt and the lock anchor are more firmly fixed and installed.

Although the invention has been described in detail only with respect to the specific examples described, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (2)

An insertion hole 11 is formed in the roadside inclined surface 10 formed of soil, sand, rock, or rock, and the lock bolt 22 is fixed to the insertion hole 11 so that the inclined surface 10 is closed. In the lock bolt and lock anchor installation device 12 to prevent collapse by impact, It is fixedly installed at a predetermined depth position of the plurality of insertion holes 11 formed in the inclined surface 10 to be in close contact with the inner circumferential surface of the insertion hole 11, the lock bolt 22 and the lock anchor 32 on the center side Packer 14 is formed with a through hole 16 for inserting the first through hole 18 and the second through hole 20 on both sides of the through hole 16; An injection hose 24 inserted into the first through hole 18 of the packer 14 and used as a passage for injecting mortar into the lower side of the packer 14; An exhaust hose 26 inserted into the second through hole 20 of the packer 14 and used as a passage for discharging the air therein to the outside according to the mortar injection to the lower side of the packer 14; Rock bolt installation device, characterized in that made. An insertion hole 11 is formed in the roadside inclined surface 10 formed of soil, sand, rock, or rock, and the lock bolt 22 is fixed to the insertion hole 11 so that the inclined surface 10 is closed. In the installation method of the lock bolt and lock anchor to prevent collapse by impact, After the packer 14 is installed at a predetermined depth position of the insertion hole 11 formed on the inclined surface 10, the lock bolt 22 is inserted at a predetermined depth through the through hole 16 of the packer 14. Performing primary grouting by injecting mortar using a swelling agent in a pressureless state on the upper side of the packer 14; After curing the first grouting, the mortar is injected through the injection hose 24 inserted into the first through hole 18 to perform high pressure secondary grouting on the lower side of the packer 14, thereby filling with high density. Lock bolt 22 and the lock anchor 32 so as to be more firmly fixed to the installation; Rock bolt installation method characterized in that consisting of.