KR20050046043A - Air pressure type packer and method of construction use that - Google Patents

Abstract

The present invention relates to a pneumatic packer and a pressure soil nailing method using the same, and more particularly, the step (s100) of drilling a drilling hole 10 of a predetermined diameter by a drilling means at an appropriate position of the ground. In step (s200) of inserting the soil nail 30 is equipped with a pneumatic packer 20 in the hole (10), the grouting fixing portion of the hole (10) cement milk through the grouting hose ( In the pressure type soil nailing method in which the step (s300) is performed in a step (s300) to be injected into a) to apply a predetermined pressure by the cement milk, the step of performing the pressure grouting step (s300) is performed. After that, the grouting fixing part (a) is pressurized and the pressurized air closes the cap 22 attached to the air hole 21 formed in the pneumatic packer 20 so that the expansion rubber 23 opens the perforated hole. Sealing step (s400) The pressure soil nailing method, characterized in that the construction time can be shortened when the method is applied, and the grouting fixing unit is effective by injecting cement milk to pressurize the cement milk injected through the grouting hose. It can increase the diameter and shear resistance, and it is economical because it can be efficiently installed at low cost.

Description

Air pressure type packer and method of construction use that}

The present invention relates to a pneumatic packer and a pressure soil nailing method using the same, and to increase the effective diameter and shear resistance of the grouting anchorage by injecting the cement milk to pressurize the cement milk injected through the grouting hose. It's about what you can do.

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.

However, the conventional soil nailing method has a long freezing time because of the application of gravity grouting, and repeats the grouting work 3 to 6 times to compensate for shrinkage, resulting in poor construction and long construction period. There was a problem that it was not easy to check the filling status and quality control.

In addition, the Republic of Korea Patent Application No. 99-51043 'Soil nailing method using a pressure grouting and its device' is introduced. However, the soil nailing method using the pressurized grouting and its apparatus separately use pipe reinforcement, and the use of pipe reinforcement additionally requires a conversion adapter for connection, and the spacer must be manufactured separately according to the diameter of the pipe reinforcement. Because of the fixed packer, there is a shortage of coping ability depending on excavation depth and terrain, and there are many injection holes on the side besides the tip of the pipe, which makes it difficult to maintain a constant injection pressure and airtightness when injecting cement milk.

In order to solve the above-described problems, a packer attached to a soil nail forms an expansion rubber and an air hole without a separate device, and when the cement milk injected through the grouting hose is pressed, the air hole is capped. It aims at being able to grout airtightly by sealing.

In order to achieve the above object, the step of drilling a punched hole of a predetermined diameter in the appropriate position of the ground, the step of inserting a pneumatic packer equipped with a nail nail, through the grouting hose The pressure grouting is performed by injecting cement milk into the grouting fixing part of the boring hole and performing pressure grouting so that a predetermined pressure is applied by the cement milk. After performing the grouting fixing unit is pressurized air closing the cap attached to the air hole formed in the pneumatic packer pressurized air comprising a step of sealing the perforated holes for expansion rubber It consists of a ring method and expansion rubber, both ends of which are Grouting is a nut-type structure formed with a screw groove so that the thread of the nail is coupled to adjust the position fixed to the soil nail in consideration of the length of the grouting fixing portion, grouting for injecting the cement milk by injecting into the grouting fixing portion of the drilling hole It is an object of the present invention to provide a pneumatic packer comprising a structure in which a hole, three air holes, and a cap sealing the air hole are movably attached to the left and right sides.

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

First, referring to the accompanying drawings, Figure 1a is a cross-sectional view of the pneumatic packer of the present invention, Figure 1b is an enlarged detail of the 'A' part of Figure 1a, Figure 1c is an enlarged detail of the 'B' part of Figure 1a Figure 2 is a schematic cross-sectional view of the CC cross-sectional view of Figure 1a, Figure 3 is a schematic view showing a cross-sectional view of AA and BB of Figure 1a, Figure 4 is a pneumatic packer of the present invention Is a cross-sectional view of the installed nail.

In FIG. 1A, which is a cross-sectional view of the pneumatic packer of the present invention, the grouting hole 25 and the three air holes 21 penetrate and the outer circumferential surface is made of expansion rubber 23, and both ends of the worker nail ( 30 is a screw groove 24 to which the thread 31 of the nail nail 30 is coupled so as to adjust the position fixed to the nail nail 30 in consideration of the size of the grouting fixing part a and the desired length of the grouting fixing part a. It is a nut type structure formed in the government part 26.

1B and FIG. 1C which is an enlarged detail view of the 'A' portion of FIG. 1A and FIG. 1C which is an enlarged detail view of the 'B' portion of FIG. 1A, the cement is injected into the grouting fixing portion (a) of the drilling hole 10. A grouting hole 25 for injecting milk or mortar is formed at the upper end of the pneumatic packer 20, and at the lower end of the pneumatic packer 20, three air holes 21 and the air hole ( 21 is a structure in which the cap 22 which seals 21 is attached so as to be movable left and right.

That is, when the cement milk or mortar is injected into the grouting fixing part a of the drilling hole 10 through the grouting hose 40 and a predetermined pressure is applied by the cement milk or mortar, the pneumatic packer 20 is applied. Since the cap 22 of the air seal 21 is sealed, the expansion rubber 23 is expanded, resulting in the diameter of the expansion rubber 23 is in close contact with the inner diameter of the drilling hole.

Looking at the construction sequence of the present invention as follows.

Step (s) of drilling a punched hole 10 of a predetermined diameter in the appropriate position of the ground by the drilling means, inserting the nail nail 30 equipped with a pneumatic packer 20 in the punched hole 10 Step (s), cement milk or mortar is injected into the grouting fixing part (a) of the drilling hole (10) through the grouting hose (40) to pressurize grouting so that a predetermined pressure is applied by the cement milk or mortar. In the pressure type soil nailing method in which the step (s) is performed sequentially, the grouting fixing unit (a) is pressed after the step (s300) of performing the pressure grouting to the pneumatic packer 20. Pressurized air closes the cap 22 attached to the formed air hole 21 so that the expansion rubber 23 seals the puncture hole (S400).

As described above, the pressure soil nailing method according to the present invention supplies pressurized cement milk or mortar to be pressed into the grouting fixing unit, thereby using pressurized air without using any chemicals or devices such as a separate fastening expander. By enclosing the air hole of the pneumatic packer of the present invention with a cap, the expansion rubber is expanded, so that the effective diameter and shear resistance of the grouting anchorage are increased, so that the effective diameter is larger than the conventional gravity grouting and the effective diameter in proportion to the injection pressure. As a result, the shear resistance is improved, which significantly improves the safety factor of the slope reinforcement and the structure.

1A is a cross-sectional view of the pneumatic packer of the present invention.

Figure 1b is an enlarged detail view of the 'A' part of Figure 1a.

Figure 1c is an enlarged detail view of the 'B' part of Figure 1a.

2 is a schematic cross-sectional view taken along the line C-C of FIG. 1A;

3 is a schematic cross-sectional view of A-A and B-B of FIG. 1A;

Figure 4 is a cross-sectional view of the installation of the pneumatic packer of the present invention.

<Code Description of Main Parts of Drawing>

a: grout fixing unit b: nail fixing unit

10: punched hole 20: air pressure packer

21: air hole 22: cap

23: expansion rubber 24: screw groove

25: grouting hole 26: fixing part

30: Soil nail 31: Thread

40: grouting hose

Claims (2)

It is made of expansion rubber (23), both ends so that the operator can adjust the position fixed to the soil nail (30) in consideration of the size of the soil nail 30 and the desired grouting fixing part (a) The screw groove 24 is a nut-shaped structure formed in the fixing part 26 so that the thread 31 of the 30 is coupled, and is injected into the grouting fixing part a of the drilling hole 10 to inject the cement milk. Pneumatic packer, characterized in that the grouting hole (25) and the three air holes (21) and the cap (22) for sealing the air hole (21) is attached to the left and right to move. A step (s100) of drilling a drilling hole 10 of a predetermined diameter by a drilling means at a suitable position of the ground, and inserting the nail nail 30 equipped with an air pressure packer 20 in the drilling hole (10) In step s200, cement milk is injected into the grouting fixing part a of the perforation hole 10 through the grouting hose 40 to perform pressure grouting so that a predetermined pressure is applied by the cement milk (s300). In the pressure type soil nailing method in which the step is sequentially performed, the grouting fixing part (a) is pressurized after the step (s300) of performing the pressure grouting to form an air hole formed in the pneumatic packer (20). Pressurized air is closed to the cap (22) attached to the 21) expansion rubber (23) comprises a step (s400) of the pressure-soil nailing method characterized in that it comprises a sealing hole.