KR200290351Y1 - A packer apparatus for pressure type soil nailing - Google Patents

Abstract

The present invention shortens the grouting time through the pressurized grouting which completely seals the grouting area, and fills the grout chemical liquid even in the gap between the perforation hole and the ground or the ground, thereby improving the stability of the ground reinforcement. A packer for a ring, comprising: a nail and a first packing and a second packing that are fitted at predetermined intervals on a center in a longitudinal direction of the nail, and are installed while surrounding the outer circumferential surfaces of the first packing and the second packing. A non-woven fabric sealing the space between the second packing, a first grouting pipe for penetrating the first packing and the second packing, one end of which is adjacent to one end of the nail, for injecting the grouting chemical into the grouting area; , Through one of the first packing and the second packing, one end of which is installed in close proximity to the second packing, Air and debris removal pipe for removing air and foreign matter, and one end of which penetrates the first packing and is located in the space between the first packing and the second packing, the volume of which is gelled in a space enclosed by the nonwoven fabric. It characterized in that it comprises a foam urethane injection pipe for injecting expanded urethane foam.

Description

A packer apparatus for pressure type soil nailing}

The present invention relates to a packer applied to the soil nailing method, and more particularly to a packer for pressure soil nailing suitable for improving the workability through tight sealing of the perforated hole and grouting by pressure.

In general, as the industry develops, it is unavoidable to develop steep slopes such as mountain areas by complex construction or construction of new towns. Therefore, construction efficiency, economic feasibility and environmental preservation can be improved while increasing land utilization and securing stability and comfort of residential complexes. It is required to establish a slope stabilization method that can satisfy the requirements.

Soil Nailing, which is widely used as slope stabilization method, is a ground reinforcement method and is widely used in Europe and the United States for the purpose of reinforcing slopes and flexible support for excavated surfaces.

Such a nail nailing method is a method of inserting nails into the base at relatively tight intervals without prestressing to increase the overall shear strength of the base itself and possibly restrain the expected displacement of the ground during or after construction.

In particular, in the case of the alternative construction site, compared to other construction methods such as heavy concrete wall, thumb pile wall, and in-situ slurry wall, the soil nailing method has a low construction cost, lightweight construction equipment, adaptability to site conditions and ground conditions, and flexibility. It has a relative advantage, and has the feature that it can fully exhibit the resistance capacity even in the case of dynamic load such as earthquake without excessive displacement.

The basic design concept of the soil nailing method is that the ingot of the area reinforced by nailing acts as if it is an integrated retaining wall, thereby maintaining stability on any inclined surface that the reinforced earth wall can assume.

Conventional soil nailing method is made in the order of ground excavation, nail installation, shotcrete placing, excavation, etc. This will be described with reference to Figures 1a to 1d.

First, as shown in FIG. 1A, the ground is excavated to a stable height at which the slope or the trench wall surface 1 can stand. In other words, the ground excavation for installing the front guard and reinforcement is almost the same as the general ground excavation. However, since the excavation surface in the soil nailing is often used as a main body structure, it is necessary to excavate to the exact position and shape, and the excavation depth where the ground can stand free depending on the soil, and the injection grout or shotcrete Consider curing period to obtain. In general, the limit digging depth is related to the apparent cohesion of the ground, and the vertical excavation step by step is recommended to be limited to a maximum of 2m.

Then, as shown in Figure 1b, after drilling the wall surface 1 to install the reinforcement, the nail 3 is installed in the perforated holes. At this time, the perforation uses a rock drill or a boring machine, and most of the fluid (air, water, nisu, cement grout, bentonite) is used.

In general, the nail 3 used in the soil nailing method may use a deformed steel reinforcing bar or steel bar, and harmful soil or oil on the part to be attached to the grout should be removed in advance.

Nails (3) used in the permanent structure should be used in consideration of the allowance for corrosion or rust-proof steel in the design, the nail (3) is recommended to use a seamless Hanbon as it is, but the insertion length is unavoidable If a connection is required, a coupler must be used, and it must not be connected by ordinary welding.

When inserting the nail 3, it is preferable to use a spacer so that the nail 3 is located at the center of the perforation hole in order to secure the minimum thickness of the grout.

Then, as shown in Figure 1c, after the shotcrete is shot, if the shotcrees are cured, as shown in Figure 1d, the ground is excavated again.

On the other hand, the process of installing the nail (3) in the perforated hole is made as follows, first, after inserting the nail (3) in the perforated hole (11), cement milk (not shown) without pressure Grout into the inside of the ball. Subsequently, a wire mesh 13 is installed on the wall 1, and then the rebar 15 is disposed horizontally on the wire mesh 13, and then a plate fastened to the nail 3. 17) and the nut (19) is pressed and fixed to the reinforcing bar 15, and then shotcrete (not shown) is poured.

At this time, the grouting should be completely filled inside the perforated hole 11, and should be repeated three to six times depending on the tendency of the grouting material to penetrate the surrounding ground.

However, the conventional soil nailing method as described above uses a gravity grouting method, so the solidification time is long, and to compensate for shrinkage, the grouting process must be repeated about 3 to 6 times. There was a problem losing.

In addition, since the perforated hole is inclined downward, it is impossible to fill the grout liquid in the grouting area, which causes a gap between the perforated hole and the ground, causing a fatal defect in the ground reinforcement.

The present invention has been made to solve the problems of the prior art as described above, it is possible to shorten the air by improving the workability by injecting a rapid expansion inflator into the packer and proceeding the grouting in a completely closed grouting area It is an object of the present invention to provide a packer for pressure soil nailing.

Another object of the present invention is to provide a pressure soil nailing packer suitable for improving the stability of the ground reinforcement by filling grout chemicals even in the gap between the drilled hole and the ground or the ground through the pressurized soil nailing. have.

1a to 1d is a construction flowchart for explaining the soil nailing method according to the prior art

Figure 2 is a conceptual diagram showing an installation example of the nail according to the conventional nail nailing method

3 is a perspective view of a packer for pressure soil nailing of the present invention

Figure 4 is an exploded perspective view of a packer for pressure soil nailing of the present invention

Figure 5 is a ground cross-sectional view for explaining the installation state of the pressure soil nailing packer of the present invention

* Description of the symbols for the main parts of the drawings *

31: nail 33a, 33b: first, second packing

35 nonwoven fabric 37: the first grouting pipe

39: air and foreign substance removal pipe 41: second grouting pipe

43: urethane foam injection tube

The pressure soil nailing packer of the present invention for achieving the above object is a packer for sealing the grouting area is inserted into a hole drilled in the excavation surface, nail; First and second packings which are fitted at predetermined intervals on the center portion in the longitudinal direction of the nail; A nonwoven fabric installed to surround the outer circumferential surfaces of the first packing and the second packing to seal a space between the first packing and the second packing; A first grouting tube penetrating the first packing and the second packing, one end of which is installed at a position close to one end of the nail, for injecting grout chemical into the grouting area; An air and debris removal tube penetrating through the first and second packings, one end of which is installed in close proximity to the second packing, and for removing air and debris from the grouting area according to the grouting; Foam urethane for penetrating the first packing, one end of which is located in the space between the first packing and the second packing, and injects the foamed urethane into the space enclosed by the nonwoven fabric, the volume of which expands upon gelation. Characterized in that it comprises a injection tube.

Here, a second grouting pipe for penetrating the first packing and the second packing, the end of which is close to the second packing, for injecting grout chemical into the grouting area, is further provided. A wire ring is installed on the outer side of the nonwoven fabric along the outer circumferential surfaces of the first and second packings for joining the packing and the nonwoven fabric, and a wire ring for tightly binding the nonwoven fabric to the outer circumferential surfaces of the first and second packings by screwing. It is characterized in that it is further provided.

Hereinafter, with reference to the accompanying drawings will be described a packer for pressure soil nailing of the present invention.

Figure 3 is a perspective view of the packer for pressure soil nailing of the present invention, Figure 4 is an exploded perspective view of the packer for pressure soil nail of the present invention, Figure 5 is an installation of the packer for pressure soil nailing of the present invention Ground cross-sectional view to explain.

As shown in the figure, the first packing 33a and the second packing 33b are fitted at predetermined intervals in the longitudinal direction of the nail 31 having the screw protrusion formed on the outer circumferential surface thereof, and the first packing 33a ) And a non-woven fabric 35 for enclosing the outer circumferential surface of the second packing 33b to seal an empty space between the first packing 33a and the second packing 33b. In this case, nylon or a tent may be used instead of the nonwoven fabric 35, and the pressure according to the volume expansion of the foamed urethane to be injected into the empty space between the first packing 33a and the second packing 33b will be described later. Any material may be sufficient to withstand the material. The material of the first packing 33a and the second packing 33b may be rubber, soft plastic, wood, iron plate, or the like. As a material of this packing, it is most preferable. That is, when the rubber packing is used, it is possible to bond more closely between the grouting pipe, the air and the foreign substance removal pipe, the foam urethane injection pipe, and the like which will be described in more detail below.

In addition, the packer for pressure soil nailing of the present invention has a first grouting pipe 37 for penetrating the first packing 33a and the second packing 33b and injecting grout chemical liquid into the grouting area primarily. The air and foreign matter removal pipe 39 for penetrating the first packing 33a and the second packing 33b and discharging air and foreign matter from the grouting area due to the grouting is installed.

At this time, the first grouting pipe 37 is preferably installed so that one end thereof is close to the end of the drilling hole, that is, one end of the nail 31, one end of the air and foreign matter removal pipe 39 Preferably, the second packing 33b is installed to be close to the second packing 33b.

For reference, the air and the foreign matter removing tube 39 is not only to discharge the foreign matter such as air or water generated in the grouting area due to the injection of the grouting chemical to the outside of the hole, but also to remove the air and foreign matter and then the inlet By closing it the pressure is applied to the grouting area. At this time, when the pressure is applied to the grouting region, the grout chemical liquid is solidified, and the grout chemical liquid is tightly filled even in the voids or joints formed in the ground around the perforation hole by the pressure to improve the overall stability of the nail. There is a number.

In addition, the packer for pressure soil nailing of the present invention is a foam urethane injection pipe 43 for injecting a rapid expansion agent such as foamed urethane into a space enclosed by the nonwoven fabric 35 is the first packing (33a) It is installed to penetrate through. At this time, one end of the foam urethane injection pipe 43 is located in the space between the first packing 33a and the second packing 33b.

The foamed urethane is injected into the urethane chemical solution in the state where the nail 31 is installed and gelled. The urethane chemical solution is gelled in the space between the first packing 33a and the second packing 33b, thereby expanding the volume. Entails. In general, the urethane chemicals have the advantage of controlling various physical properties such as expansion ratio, mechanical strength, and the like. Actually, the time when the urethane chemicals are gelled is only a few minutes. If filled, the first grout can be injected shortly after.

Wiring outside of the nonwoven fabric 35 along the outer circumferential surface of the first and second packings 33a and 33b to join the nonwoven fabric 35 and the first and second packings 33a and 33b. 45 is installed, the wire ring 45 is urethane chemical liquid non-woven fabric 35 by binding the non-woven fabric 35 in close contact with the outer peripheral surface of the first and second packings 33a, 33b by screwing method. Even if volume expansion occurs, it can be firmly supported.

In addition, the packer for pressure soil nailing according to the present invention further includes a second grouting pipe 41, wherein the second grouting pipe 41 penetrates the first packing 33a and the second packing 33b. However, one end thereof is installed to be close to the second packing 33b.

The second grouting tube 41 is a tube for injecting a second grout chemical solution to fill a void space in the perforation hole due to dry shrinkage of cement after the first grouting, and the first grout chemical solution is not filled. The grout chemical liquid is secondarily filled in the space by the pressurization method so that the grout chemical liquid can be filled in the entire area of the grout region, and at the same time, the grout chemical liquid is sufficiently filled in the voids formed in the ground around the perforation hole.

Referring to the soil nailing method using the pressure-type soil nailing packer of the present invention as follows.

First, excavate the ground to a stable height that slopes or trench walls can stand free, and then drilled the wall to install the reinforcement, and then nailed with a packer for pressure soil nailing as shown in Figure 3 in the perforated hole Insert (31) and install.

Thereafter, a rapid expanding agent such as a urethane chemical is injected into the space between the first packing 33a and the second packing 33b sealed by the nonwoven fabric 35 through the foam urethane injection pipe 43.

As mentioned above, the urethane chemical solution is gelled at a very fast rate, so that when the water passes after the injection, the urethane chemical is gelled to cause volume expansion, which means expansion of the nonwoven fabric 35. The result is that the diameter is in close contact with the inner diameter of the drilled hole.

Thereafter, a primary grout chemical solution is injected through the first grouting tube 37 to fill the grout region with a grout chemical liquid such as cement milk. At this time, the grout area is filled with the grout chemical liquid and at the same time, air or foreign matters are generated, and these are discharged to the outside of the hole through the air and the foreign matter removing pipe 39.

Subsequently, the air and the foreign matter removing tube 39 is closed and the grout chemical solution is injected so that pressure filling is performed in the grout region. The grout chemical is also filled in the pores or joints formed in the ground around the perforation hole by the pressure filling of the grout chemical.

On the other hand, after the filling of the first grout chemical solution in the grouting area, after several minutes, the filled grout liquid, that is, cement milk is solidified and dry shrinkage occurs so that an empty space exists near the second packing 33b. In order to inject the grout chemical into the empty space, an additional injection of the grout chemical is required.

Thus, the secondary grout chemical solution is injected through the second grout tube (41). At this time, the second grouting pipe 41 is installed so that one end thereof is close to the second packing 33b, so that the second grouting pipe 41 is injected into the second packing 33 near the second packing 33 where the primary grout chemical liquid was not filled due to dry shrinkage. The grout can be filled more easily.

When the grouting is completed in this way, after installing the wire mesh (Mesh) on the wall surface, the rebar is placed horizontally on the wire mesh, and then crimping and fixing the rebar with a plate and nut fastened to the nail 31, When the shotcrete is poured, the soil nailing using the packer for pressure soil nailing of the present invention is completed.

Although the preferred embodiment of the present invention has been described above, it is clear that the present invention can use various changes, modifications, and equivalents, and that the above embodiments can be appropriately modified in the same manner. Therefore, the above description does not limit the scope of the present invention defined by the limits of the utility model registration claims below.

As described above, the packer for pressure soil nailing of the present invention has the following effects.

Using a packer injecting a rapid expanding agent, grouting is performed in a state in which the inner surface of the drilling hole is tightly sealed, so that the grouting work can be completed in a short time, thereby shortening the construction time.

In addition, it is possible to improve the stability of the ground reinforcement because it is possible to firmly fill the grouting chemical liquid even in the pores or joints formed on the ground through the pressurized soil nailing.

Claims (4)

A packer for sealing a grouting area inserted into a hole drilled in an excavation surface, Nails; First and second packings which are fitted at predetermined intervals on the center portion in the longitudinal direction of the nail; A nonwoven fabric installed to surround the outer circumferential surfaces of the first packing and the second packing to seal a space between the first packing and the second packing; A first grouting tube penetrating the first packing and the second packing, one end of which is installed at a position close to one end of the nail, for injecting grout chemical into the grouting area; An air and debris removal tube penetrating through the first and second packings, one end of which is installed in close proximity to the second packing, and for removing air and debris from the grouting area according to the grouting; Foam urethane for penetrating the first packing, one end of which is located in the space between the first packing and the second packing, and injects the foamed urethane into the space enclosed by the nonwoven fabric, the volume of which expands upon gelation. Pressure Soil Nailing Packer with Injection Tube. According to claim 1, The second packing is penetrating through the first packing and the second packing is provided so that the end is adjacent to the second packing is further provided for injecting grout chemical liquid into the grouting area. Pressure Soil Nailing Packer The nonwoven fabric of claim 1, wherein the nonwoven fabric is disposed outside the nonwoven fabric along the outer circumferential surfaces of the first and second packings for joining the first and second packings to the nonwoven fabric. A pressure soak nailer packer, characterized in that the wire ring is further provided in close contact with the outer peripheral surface of the second packing. The packer for pressure soil nailing as claimed in claim 1, wherein the first and second packings are made of rubber.