JPH0522040B2 - - Google Patents

Description

Detailed Description of the Invention <Field of Industrial Application> The present invention relates to a filler injection rod for injecting various fillers for the purpose of fixing anchor bolts underground or reinforcing the ground. It is something.

<Conventional technology> As a method of fixing anchor bolts underground,
A method is known in which a filler such as urethane foam is injected under high pressure into the anchor hole and fixed.

This fixing method is carried out by using a hollow anchor bolt, and injecting a fixing filler such as urethane foam into the hole at high pressure using the inner space of the anchor bolt as an injection path.

By the way, when performing this type of injection work, measures against leakage of the filler are particularly important.

In order to prevent leakage of filler material, etc., a method is generally adopted in which a packer is provided midway through the anchor bolt to cover the inside of the hole.

<Problems to be Solved by the Present Invention> The conventional injection techniques for fillers and the like described above have the following problems.

(b) Conventional police cars only have one anchor bolt installed.

Therefore, the leakage prevention effect of the filler is low, and the higher the injection pressure is, the more likely the filler is to leak.

(b) Conventional pack cars consist of a bag made of rubber or cloth, and are inflated by injecting various fluids (for example, water, air, mortar, etc.) under pressure into the bag.

However, in the case of a rubber police car, there remains an atmosphere in which there is no escape.

If air remains in the packer, the area where the air remains will easily dent, leaving concerns about the effectiveness of the filler in preventing leakage.

In addition, in the case of a cloth packer, although no air remains inside the packer, there is a risk that the fluid injected into the packer may pass through the packer and leak, so a sufficient shielding effect cannot be expected.

(c) Conventional police cars have a short shielding section.

Therefore, even if a fixing filler is injected into a hole covered by a packer, there is a possibility that the filler will penetrate into the ground, go around from the outside of the packer, and leak out.

<Objective of the present invention> The present invention was made in order to solve the above problems, and provides a filler material that can simplify the structure, has an excellent leakage prevention effect, and can increase the permeation area into the ground. The purpose of this invention is to provide an injection rod for the following purposes.

<Configuration of the present invention> Next, one embodiment of the present invention will be described.

In this embodiment, a case will be described in which foamed urethane is used as a filler for fixing.

(b) Overall structure of the injection rod FIG. 1 shows an example of an injection rod.

This injection rod consists of a rod main body 1, a first packer 2 and a second packer 3 provided midway through the rod main body 1, and an auxiliary rod 4 that communicates between the two packers 2 and 3.

The structure of each part will be explained in detail below.

(B) Rod main body The rod main body 1 has an axial path 11 in its axial center, and has a large number of discharge ports 12 communicating with the axial path 11 on the circumferential surface of its tip.
The fixing filler 7 injected from the base end of the
It has a structure that allows it to be discharged from 2.

(c) Packer Both the first packer 2 and the second packer 3 are formed into donut-shaped bags made of a material that permeates air but does not permeate the expansion filler 61 such as urethane foam. It is fixed to the outer circumference at a predetermined interval.

The mounting interval between the first packer 2 and the second packer 3 is appropriately determined in consideration of the hole diameter of the anchor hole 5, the geology of the anchorage ground, etc.

As an example of the material for the first packer 2 and the second packer 3, for example, cloth for a parachute material is suitable, but other known materials that can satisfy the above properties can be used.

(d) Auxiliary rod The auxiliary rod 4 is used to inject two types of fluid: an expansion fluid into the first packer 2 and the second packer 3, and a sealing filler 6 to be filled between the two packers 2 and 3. This is a hollow tube with a closed tip.

The auxiliary rod 4 passes through the first packer 2 and its tip is located inside the second packer 3.

Check valves having different discharge start pressures (valve pressures) are provided at a plurality of locations along the auxiliary rod 4.

That is, in two places located in the first packer 2 and the second packer 3 on the way of the rod main body 1,
Low-pressure check valves 41 and 42 that start discharging fluid with low fluid pressure are provided, respectively, and a high-pressure check valve 43 that starts discharging fluid with high fluid pressure is provided at the exposed location between both packers 2 and 3. will be established.

Low pressure check valves 41, 42 and high pressure check valve 43
As shown in FIG. 2, annular ring bands 41b, 42 made of an elastic material are placed around each of the holes 41a, 42a, 43a formed on the circumferential surface of the auxiliary rod 4.
b, 43b are externally packaged, and a structure that allows fluid to be discharged from the inside of the auxiliary rod 4 to the outside and prevents backflow can be adopted.

If the valve pressures of all the check valves 41, 42, 43 are set to be the same, the check valves 41, 42, 43 are opened at the same time, so leakage of the sealing filler 6 is expected.

Therefore, in this embodiment, after the both packers 2 and 3 are inflated, the low pressure check valve 4 is opened so that the sealing filler 6 can be started to be discharged between both the packers 2 and 3.
The pressure of the valves 1 and 42 is set lower than that of the high-pressure check valve 43, and the start timing of discharge is staggered.

The valve pressure of the low pressure check valves 41 and 42 is changed to the high pressure check valve 43.
To make it lower, each ring band 41b, 42
It can be easily set by selecting the elasticity of b, 43b, etc.

<Action of the present invention> Next, a method of injecting the filler will be explained.

(a) Inserting the injection rod Insert the injection rod into the anchor hole 5 with the first packer 2 and the second packer 3 deflated.

(b) Expansion of the packer (Fig. 2) Next, from the base end of the auxiliary rod 4 exposed outside the anchor hole 5, urethane foam with an expansion ratio of about 4 to 10 times is pumped.

The pressure of the foamed urethane fed into the auxiliary rod 4 is controlled by each check valve 41, 42, whose pressure has been adjusted.
43, first the first police car 2 and the second
Low-pressure check valves 41 and 42 located inside the police car 3
Expandable filler 61 is discharged from.

At this time, the air existing inside the first packer 2 and the second packer 3 passes through each of the first packer 2 and the second packer 3 and is exhausted to the outside.

Since the first packer 2 and the second packer 3 are made of a material that only allows air to pass through, there is no need to worry about the expansion filler 61 leaking outside.

As a result of the first packer 2 and the second packer 3 expanding and coming into close contact with the hole wall, the interior of the anchor hole 5 is shielded at two spaced apart locations.

(c) Injection of sealing filler (Figure 3) Even after the entire area of the first packer 2 and second packer 3 is filled with the expansion filler 61, injection from the base end of the auxiliary rod 4 is continued. do.

Then, the high-pressure check valve 43 located between the first packer 2 and the second packer 3 starts discharging urethane foam, which will become the sealing filler 6.

The sealing filler 6 increases the foaming pressure over time,
After filling the shielded space in the anchor hole 5 shielded by the first packer 2 and the second packer 3, it flows into the ground through the hole wall exposed between the first packer 2 and the second packer 3. Penetrate.

The present invention does not simply shield only the inside of the anchor hole 5, but also infiltrate the sealing filler 6 into the ground of the anchor hole 5 to cover a certain range inside and outside the anchor hole 5. By shielding, the shielding effect is increased.

(d) Injecting the fixing filler 7 Next, when the fixing filler 7 is started to be supplied from the base end of the rod body 1, it is discharged from the discharge port 12 deep into the anchor hole 5.

After filling the deep part of the anchor hole 5 blocked by the first packer 2, the fixing filler 7 penetrates into the ground through the hole wall of the anchor hole 5 and expands its penetration range.

Since the anchor hole 5 is blocked by the first packer 2 and the sealing filler 6 on the way, the anchor hole 5 is blocked by the fixing filler 7 at the entrance side of the anchor hole 5.
leakage is prevented.

Therefore, the fixing filler 7 can be injected under high pressure, and the permeation area can be increased.

Other Examples 1 In the above example, the case where the auxiliary rod 4 was used for injecting the expansion filler 61 into the first packer 2 and the second packer 3 and the sealing filler 6 was explained. , as shown in FIG.
1 and 42 and a high-pressure check valve 43 may be provided, and a high-pressure valve 8 whose flow path is opened by high fluid pressure may be interposed in front of the first packer 2.

In the case of this embodiment, after the low-pressure check valves 41 and 42 first discharge the expansion filler 61, the high-pressure check valve 43 starts discharging the sealing filler 6, and then the high-pressure valve 8 starts discharging the sealing filler 6. The discharge start pressures of the check valves 41 to 43 and the high pressure valve 8 are respectively set so as to open the flow path and start injection of the fixing filler 7.

For example, the high-pressure valve 8 is configured such that the valve ball 82 is pressed against the shaft path 11 by the elasticity of the spring 81 to normally close the flow path, and when a fluid pressure greater than the elasticity of the spring 81 acts, the valve ball 82 is pushed back. A structure that opens the flow path can be adopted.

By providing the low pressure check valves 41, 42 and the high pressure check valve 43 directly on the rod valve body 1 in this way,
The auxiliary rod 4 can be omitted.

Other Embodiments 2 In the above embodiments, the case of fixing an injection rod has been described, but the present invention can also be easily applied to fixing an anchor made of a bundle of a plurality of stranded PC steel wires.

Further, in the above embodiments, the case where foamed urethane is used for the expansion filler 61, the sealing filler 6, and the fixing filler 7 has been described, but other materials such as mortar, various resins, or a combination of different materials may be used. You can use it as well.

Furthermore, it is also possible to inject the sealing filler 6 and the fixing filler 7 using materials that have different permeability into the ground.

In this case, in particular, if a fixing filler 7 is used that has a relatively higher permeability than the sealing filler 6, only the tip of the injection rod 1 can be fixed.

Conversely, the sealing filler 6 is replaced with the fixing filler 7.
If a material having a relatively high penetration performance is used, the effect of preventing leakage caused by the fixing filler 7 penetrating into the ground can be further improved.

Further, in the above embodiment, the case where the filler is injected for the purpose of fixing the injection rod 1 has been explained, but the packer 2, which has a large mounting interval,
When the sealing filler 6 is injected between the holes 3 and 3, and then a filler such as foamed urethane is discharged from the outlet 12 at the tip of the injection rod 1, the injection rod 1 has a fixing effect and at the same time reinforces the surrounding ground. You can also get the effect.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

(b) Conventionally, the inside of the hole was shielded using one packer, but in the present invention, the hole is shielded using a plurality of packers and a sealing filler filled in the spaces between these packers and the packers. be.

Therefore, there is no fear that the fixing or reinforcing filler will leak out from between the packer and the hole wall as in the prior art, and the fixing or reinforcing filler can be injected under high pressure.

(b) Since high-pressure injection of filler is possible, the permeation area can be expanded.

Expanding the permeation area is beneficial in the applications in which it is adopted, for example, in the case of anchors, the yield strength improves, and in the case of ground reinforcement, the reinforcement range becomes wider.

(c) Opening both types of check valves by setting the opening pressure of the low-pressure check valve installed on the auxiliary rod in each packer to be lower than the high-pressure check valve installed on the auxiliary rod between both packers. The timing has shifted.

Therefore, after both packs are inflated and sealed reliably, the sealing filler can be discharged from between both packs.

(d) As a method for expanding the padska and discharging the sealing filler, pipes for injecting the expansion filler into each padska are individually connected, and the sealing filler is further discharged between the padskas. A possible method is to position the pipes, but in addition to requiring a large number of pipes, it is also necessary to inject filler into each pipe.

In contrast, in the present invention, the expansion of the packer and the discharge of the sealing filler can be performed using a single auxiliary rod equipped with a check valve, and the filler only needs to be continuously supplied from the base end of the auxiliary rod.

Therefore, the number of parts can be reduced and the filling material injection operation can be simplified.

[Brief explanation of the drawing]

Fig. 1: An explanatory view of one embodiment of the present invention when the injection rod is fixed, Fig. 2
Figure: Partially enlarged view when the packer is expanded; Figure 3: Partially enlarged view when sealing filler is injected between the packers; Figure 4: Explanatory diagram of another embodiment.

Claims (1)

[Scope of Claims] 1. A rod main body having a flow path in its axial center and having a discharge port at its tip; a first packer externally mounted on the middle of the rod main body; and a second packer mounted externally at a position separate from the first packer, an auxiliary rod with a closed tip is inserted between the first packer and the second packer, and an auxiliary rod located between the first packer and the second packer. A high-pressure check valve that opens at a constant pressure and discharges the sealing filler is provided, and an auxiliary rod located in both packers opens at a lower pressure than the high-pressure check valve and discharges the expanding filler. A rod for injecting filler material that is configured with an individual low-pressure check valve that discharges.