JP2844313B2 - Ground anchor packer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packer used as a ground anchor for supporting a structure such as a building foundation on the ground, and a method of constructing the packer.

[0002]

2. Description of the Related Art Conventionally, a stainless steel sheath is attached around a fixing portion of a tensile steel material in which a large number of steel strands are bundled, and an anchor body having a synthetic resin sheath attached to a free length portion is inserted into a drilled hole. CB mortar is injected into a bag-shaped packer attached to the boundary between the anchoring portion and the free length portion of the anchor body, and sealed by expanding the CB mortar until it is pressed against the inner wall of the drilled hole. In this state, grout is inserted into and out of the stainless sheath. There is known a ground anchor method in which injection and filling are performed.

Further, as a packer for an injection pipe used for ground injection, a packer body in which the front and rear ends of a sleeve-shaped inflatable body are attached to an annular metal member arranged vertically is used. The upper and lower hardware and the injection pipe are inserted and fitted, and one is fixed and the other is slidably tightly sealed via a packing, and the expansion body is expanded by press-fitting nitrogen gas into the expansion body. Packers and their construction methods are also known (JP-A-2-88).
880).

[0004]

The conventional packer used in the above-mentioned ground anchor method uses a bag formed of a tough cloth, which is attached to an anchor body in the field work. Since the synthetic resin sheath at the boundary between the cable and the free length is peeled off and a part of the bag is sandwiched between the exposed steel strands and attached, the installation work is extremely troublesome and time-consuming, and There has been a problem that the finished condition of the mounting is slightly different every time, and the uniformity and reliability of the mounting are lacking.

[0005] Further, in the packer body for an injection pipe in which the front and rear ends of the above-mentioned conventional sleeve-shaped inflatable body are attached to a vertically arranged annular metal body, the annular metal body is fixed or slidable to the injection pipe having a perfect circular cross section. Can be sealed,
An object having irregularities in its outer shape, such as an anchor body made of steel stranded wires, could not be tightly sealed and could not be mounted, but was insufficient.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention is characterized in that rigid fixing sleeves 2 and 3 arranged at predetermined intervals above and below are connected to each other and are connected to each other so as to be overlapped inside and outside. Outer packer 4 consisting of attached rubber sleeve
And an inner packer 5. An air passage 10 for introducing gas is provided between the outer packer 4 and the inner packer 5 in the upper fixed sleeve 2, and an air supply pipe 11 is connected to the air passage 10. The present invention proposes a packer for ground anchors.

The present invention also relates to an outer packer 4 and an inner packer 5 comprising rigid fixing sleeves 2 and 3 which are disposed at predetermined intervals above and below, and rubber sleeves which are connected to the fixing sleeves and are attached to the inside and outside. The fixed sleeves 2 and 3 are formed in a cylindrical shape having an inner diameter such that the anchor body 12 can be inserted close to the hollow portion thereof, and the outer diameters of the outer peripheral portions 2a and 3a on the distal end side opposed to each other. The outer diameters of the outer peripheral portions 2b and 3b on the rear end side are larger than those of the rear end portions, so that steps are provided on the front and rear portions. Each end of the outer packer 4 is fitted to the outer peripheral portions 2b and 3b on the rear end side. Inserted,
It is clamped and fixed by a holding ring metal piece 6 pressed from the outside, and each end of the inner packer 5 is inserted into the outer peripheral portions 2a and 3a on the distal end side, and the pressing ring metal piece 7 pressed from the outside. The upper fixed sleeve 2 has an inflow hole 8 formed in the rear end face thereof.
, The outer peripheral portions 2a, 3a on the front end side and the outer peripheral portions 2b, 2b on the rear end side.
The present invention proposes a ground anchor packer in which a ventilation path 10 is provided to an outflow hole 9 opened on the outer peripheral side of a boundary portion with 3b, and an air supply pipe 11 is connected to the inflow hole 9.

Further, the present invention relates to an outer packer 4 and an inner packer 5 comprising rigid fixing sleeves 2 and 3 arranged at predetermined intervals above and below, and rubber sleeves connected to the fixing sleeves and attached to the inside and outside. And an air passage 10 for introducing gas between the outer packer 4 and the inner packer 5 in the upper fixed sleeve 2, and an air supply pipe 11 connected to the air passage 10. The anchor 12 is inserted into the fixing sleeves 2 and 3 from the fixed ends thereof, and the fixing portion 12a and the free long portion 12b are inserted.
After the anchor body 12 and the packer body 1 are inserted into the drilled holes 13, nitrogen gas is supplied to the outer packer 4 through the air supply pipe 11 and the air passage 10 at the surface.
And the inner packer 5 is pressurized to expand the outer packer 4 and the inner packer 5 outward and inward, respectively, and the outer packer 4 is pressed against the inner wall of the hole 13 to seal this portion, and The packer 5 proposes a construction method of a packer in a ground anchor in which the outer periphery of the anchor body 1 is press-bonded to seal this portion.

[0009]

Since the packer body 1 is manufactured in a factory, uniform and reliable quality can be obtained without processing on site, and the anchor body 12 is fitted into the fixing sleeves 2 and 3 from the fixed end side. By inserting, the anchor body 12 can be extremely easily and quickly installed at the boundary between the fixing part 12a and the free length part 12b.

At the time of installation of the anchor body, nitrogen gas is pressure-fed into the gap between the outer packer 4 and the inner packer 5 through the air supply pipe 11 and the ventilation passage 10 at the surface of the ground, whereby the outer packer 4 and the inner packer 5 are respectively moved. Simultaneously and reliably inflates outwardly and inwardly, whereby outer packer 4 crimps against the inner wall of the drilling to seal this area and inner packer 5 crimps around the outer circumference of the anchor body to seal this area simultaneously. be able to.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a packer body 1 is composed of rigid sleeves 2, 3 made of metal or the like arranged at predetermined intervals above and below, and a rubber sleeve connected to them and attached to the inside and outside of the sleeve. , And an outer packer 4 and an inner packer 5.

The fixing sleeves 2 and 3 are formed in a cylindrical shape having an inner diameter such that an anchor body can be inserted close to the hollow portion thereof, and the outer peripheral portions 2a and 2a on the distal end side are opposed to each other.
The outer diameter of the outer peripheral portions 2b and 3b on the rear end side is formed larger than the outer diameter of 3a, and a step is provided at the front and rear portions. Each of the outer packers 4 is provided on the outer peripheral portions 2b and 3b on the rear end side. The end portion is inserted and fixed by a holding ring metal member 6 pressed from the outside thereof.
Each end of the inner packer 5 is fitted into a and 3a, and is clamped and fixed by a holding ring metal member 7 pressed from the outside.

The fixed sleeve 2 located on the upper side of the packer body 1 is opened on the outer peripheral side of the boundary between the outer peripheral portion 2a on the front end side and the outer peripheral portion 2b on the rear end side from the inflow hole 8 provided in the rear end surface. An air passage 10 is provided to the outflow hole 9, and an air supply pipe 11 is connected to the inflow hole 8.

The outer packer 4 and the inner packer 5
The outer peripheral portions 2a, 3a, 2b, 3b and the press contact surfaces of the holding ring metal members 6, 7 which hold the end portions are provided with irregularities for cutting into the rubber and resisting removal.

The packer body 1 configured as described above is
As shown in FIG. 2, the anchor body 1 is inserted into the fixing sleeves 2 and 3 in a state where the outer packer 4 and the inner packer 5 are contracted.
2 is inserted from the fixed end side and installed at the boundary between the fixing portion 12a covered with a stainless sheath and the free long portion 12b covered with a synthetic resin sheath (covered with a heat-shrinkable synthetic resin tube).

The anchor body 12 is connected to the packer body 1
And then into the drilled hole 13, nitrogen gas is pumped through the air supply pipe 11 at the surface,
Through the outlet hole 9.

Thus, the nitrogen gas is supplied to the outer packer 4.
Into the gap between the inner packer 5 and the inner packer 5 to expand them outward and inward, respectively. As shown in FIG. 3, the outer packer 4 is pressed against the inner wall of the hole 13 to seal this portion, and 5 is pressed against the outer periphery of the anchor body 1 to seal this portion.

Therefore, as shown in FIG.
The grout injected and filled around the second fixing portion 12a is reliably prevented from flowing out of the hole 13.

[0019]

As described above, according to the present invention, since the packer body is manufactured at the factory, uniform and reliable quality can be obtained without processing on site, and the anchor body is installed in the fixing sleeve. By fitting in from the fixed end side, it is possible to install the anchor body very simply and quickly at the boundary between the fixing portion and the free length portion.

At the time of installation of the anchor body, nitrogen gas is pressure-fed into the gap between the outer packer and the inner packer through an air supply pipe and a ventilation passage at the ground surface, whereby the outer packer and the inner packer are simultaneously and outwardly and inwardly respectively. This ensures that the outer packer is pressed against the inner wall of the drill hole to seal this part, and that the inner packer is pressed against the outer periphery of the anchor body to simultaneously seal this part.

[Brief description of the drawings]

FIG. 1 is a vertical side view of a packer body according to the present invention.

FIG. 2 is a longitudinal sectional side view showing an unexpanded state in which a packer body according to the present invention is installed on an anchor body and inserted into a hole.

FIG. 3 is a vertical sectional side view showing a state where the packer body according to the present invention is installed on an anchor body, inserted into a hole, and then expanded.

FIG. 4 is a longitudinal sectional side view showing a construction state of an anchor body in a state where a packer according to the present invention is inflated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packer body 2 Fixed sleeve 2a Front end outer peripheral part 2b Rear end outer peripheral part 3 Fixed sleeve 3a Front end outer peripheral part 3b Rear end outer peripheral part 4 Outer packer 5 Inner packer 6 Press ring hardware 7 Press ring hardware 8 Inflow hole 9 Outflow Hole 10 Ventilation path 11 Air supply pipe 12 Anchor body 12a Fixing part 12b Free length part 13 Drilling

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 5/80

Claims (3)

(57) [Claims] 1. An upper pack comprising a rigid fixing sleeve made of a rigid body disposed at predetermined intervals above and below, and an outer packer and an inner packer made of a rubber sleeve connected to the fixed sleeves and attached inside and outside. A ground anchor packer comprising: a fixed sleeve provided with an air passage for introducing gas between the outer packer and the inner packer, and an air supply pipe connected to the air passage. 2. An outer packer and an inner packer, each of which is made of a rigid fixing sleeve disposed at predetermined intervals above and below, and a rubber sleeve connected to the rigid fixing sleeves and attached to the inside and outside of the fixing sleeve, wherein the fixing sleeve is It is formed in a cylindrical shape with an inner diameter that allows the anchor body to be inserted close to the hollow part, and the outer diameter of the outer peripheral part on the rear end side is larger than the outer diameter of the outer peripheral part on the front end side facing each other. The front and rear parts are stepped, and each end of the outer packer is inserted into the outer peripheral part on the rear end side, and is clamped and fixed by a holding ring metal crimped from the outside,
Each end of the inner packer is inserted into the outer peripheral part on the tip side, and is clamped and fixed by a press ring metal fitting pressed from the outside. An air passage is provided from the hole to an outflow hole opened on the outer circumference of the boundary between the outer peripheral portion on the front end side and the outer peripheral portion on the rear end side, and an air supply pipe is connected to the inflow hole. Soil anchor packer. 3. An upper and lower packer comprising: a rigid fixing sleeve which is vertically arranged at predetermined intervals; A fixed sleeve is provided with an air passage for introducing gas between the outer packer and the inner packer, and a ground anchor packer obtained by connecting an air supply pipe to the air passage is used, and an anchor body is provided in the fixed sleeve. After being inserted from the fixed end side and installed at the boundary between the fixing part and the free length part, and after inserting the anchor body together with the packer body into the drilled hole, nitrogen gas is passed through the air supply pipe and the ventilation path at the ground surface part. The outer packer and the inner packer are pressure-fed into the gap between the outer packer and the inner packer, thereby expanding the outer packer and the inner packer outward and inward, respectively. A method for installing a packer in a ground anchor, wherein the inner packer is pressed against the inner wall of the hole to seal this portion, and the inner packer is pressed against the outer periphery of the anchor body to seal this portion.