JP7779728B2 - Injection hose feeder - Google Patents

Description

The present invention relates to an injection hose feed device.

For example, chemical grouting is a known method for improving the ground of gravel layers and unconsolidated layers that are prone to collapse. One example of a chemical grouting method is a method using a double packer or triple packer (see, for example, Patent Document 1).

Generally, in chemical injection methods using double packers or the like, a casing pipe or the like is used to drill a borehole to a predetermined depth to create a borehole, and then an injection hose is inserted into the borehole (strictly speaking, the injection hose is inserted into the casing pipe left in the borehole), and a chemical such as sealing grout is injected from the injection hose. After erecting a sleeve pipe, the casing pipe is removed, and an injection pipe equipped with a packer is inserted into the sleeve pipe. With the packer expanded, chemicals are injected into the injection pipe to create a ground improvement body (see, for example, Patent Document 2). Incidentally, the work of inserting the injection hose into the borehole has traditionally been done manually.

Japanese Patent Application Laid-Open No. 2005-314940 Japanese Patent Application Laid-Open No. 2021-172983

In recent years, however, structures are being constructed at great depths, exceeding 50 meters underground, which has led to the need for ground improvement work at such great depths. When inserting an injection hose to such great depths and then pulling it up, the length and weight of the hose increase, placing a heavy burden on workers. In particular, because such injection hoses are inserted into or pulled up from boreholes with water or chemicals already inside the hose, their weight increases further, further increasing the burden on workers.

In light of these problems, the present invention aims to propose an injection hose feeder that makes it easy to insert an injection hose into a borehole and pull up the injection hose from the borehole.

The present invention is an injection hose feed device for inserting an injection hose into or pulling up an injection hose from a borehole created in the ground, comprising: a first drive roller that contacts the outer surface of the injection hose; a second drive roller that is arranged opposite the first drive roller and contacts the outer surface of the injection hose; and an elastic body that presses the second drive roller toward the first drive roller.The injection hose feed device is provided with a drive side swing arm that is swingably supported by a swing shaft, the second drive roller is rotatably supported on the drive side swing arm, and the elastic body is connected to the drive side swing arm at a position away from the swing shaft, and biases the drive side swing arm in a direction that moves the second drive roller toward the first drive roller .
It is also preferable that the first drive roller and the second drive roller are driven by a chain so as to rotate in synchronization with each other, and that an idler is provided that is pressed against the chain to absorb any excess or deficiency in the length of the chain caused by the swing of the drive side swing arm.

The present invention also provides an injection hose feed device for inserting an injection hose into or pulling up an injection hose from a borehole created in the ground, comprising: a first drive roller that contacts the outer peripheral surface of the injection hose; a second drive roller that is arranged opposite the first drive roller and contacts the outer peripheral surface of the injection hose; and an elastic body that presses the second drive roller toward the first drive roller, wherein the outer peripheral surfaces of the first drive roller and the second drive roller have protrusions that protrude radially outward, and the protrusions are formed by multiple V-shaped convex portions that form a V shape when viewed from the radial outside of the first drive roller and the second drive roller, and are arranged along the circumferential direction of the first drive roller and the second drive roller.
In such an injection hose feed device, it is preferable that the outer surface of the first drive roller has a first concave surface that contacts the outer surface of the injection hose, and the outer surface of the second drive roller has a second concave surface that contacts the outer surface of the injection hose.

It is also preferable that the injection hose feed device has measuring means that rotates together with the injection hose being fed out and measures the amount of injection hose fed out.

With the injection hose feeder of the present invention configured as described above, the injection hose is sandwiched between the first and second drive rollers by the elastic body. By rotating both the first and second drive rollers in this state, the injection hose can be inserted into or pulled out of the borehole depending on the direction of rotation of these rollers. Note that multiple injection hoses are sometimes connected together using joints with a larger diameter than the injection hose's outer diameter. The injection hose feeder of the present invention presses the second drive roller toward the first drive roller with an elastic body, and joints with an outer diameter different from that of the injection hose can pass between the first and second drive rollers, so injection hoses connected by such joints can be used without any problems.

1 is a schematic diagram of an embodiment of an injection hose feeder according to the present invention; 2 is a schematic diagram of a drive unit of the injection hose feeder shown in FIG. 1 . 2 is a view taken along the arrow X shown in FIG. 1 . 2 is a partially enlarged cross-sectional view of the first drive roller and the second drive roller shown in FIG. 1, taken from the radially outer side. FIG.

An embodiment of the injection hose feeder according to the present invention will now be described with reference to the drawings. Figure 1 is a schematic diagram of one embodiment of the injection hose feeder according to the present invention. The illustrated injection hose feeder 1 is used to insert the injection hose H into a borehole DH created in the ground or to pull up the injection hose H from the borehole DH during a chemical injection method in which a chemical solution is injected from an injection hose H into the borehole DH created in the ground. In chemical injection methods using double or triple packers, a casing pipe or the like is used to create the borehole DH in the ground, and the injection hose H is inserted into the casing pipe left in the borehole DH; however, the casing pipe is omitted from Figure 1. The illustrated injection hose H is made up of multiple hoses connected via joints J. The outer diameter of the joints J is larger than the outer diameter of the injection hoses H.

The injection hose feeder 1 of this embodiment includes a base 2, shown by an imaginary line in Figure 1. The injection hose feeder 1 also includes a first drive roller 3, a second drive roller 4, a drive-side swing arm 5, an elastic body (drive-side elastic body 6), an adjustment unit 7, a drive unit 8, a first driven roller 9, a second driven roller 10, a driven-side swing arm 11, an elastic body (driven-side elastic body 12), and an encoder 13.

The first drive roller 3 is generally disc-shaped and rotatably supported on the base 2. The second drive roller 4 is generally disc-shaped and has the same diameter as the first drive roller 3, and is rotatably supported on the drive-side swing arm 5. In this embodiment, the portions that make up the outer periphery of the first drive roller 3 and second drive roller 4 are made of an elastic material such as rubber. The detailed configuration of the first drive roller 3 and second drive roller 4 will be described later.

One end of the drive-side swing arm 5 is swingably attached to the base 2. In this embodiment, the drive-side swing arm 5 is attached to the base 2 so that it swings around the swing axis C1 at a position where the second drive roller 4 faces the first drive roller 3. An adjustment unit 7 is attached to the base 2, and the other end of the drive-side swing arm 5 is connected to a drive-side elastic body 6 attached to the adjustment unit 7, and is biased in a direction that moves the second drive roller 4 toward the first drive roller 3. The adjustment unit 7 adjusts the biasing force of the drive-side elastic body 6 applied to the other end of the drive-side swing arm 5. In this embodiment, the adjustment unit 7 is composed of a bolt to which the drive-side elastic body 6 is attached at one end and a nut that secures the bolt to the base 2. By changing the length of the bolt used to secure the arm to the base 2, the biasing force applied by the drive-side elastic body 6 to the drive-side swing arm 5 can be adjusted.

The drive unit 8 rotates the first drive roller 3 and the second drive roller 4 in synchronization. As shown in Figure 2, the drive unit 8 in this embodiment is composed of a motor 14, two drive sprockets 15, two idler sprockets 16, a chain 17, an idler 18, an idler swing arm 19, and an idler elastic body 20.

The motor 14 rotates the first drive roller 3. A drive sprocket 15 is attached to the rotation shaft of the first drive roller 3. A drive sprocket 15 is also attached to the rotation shaft of the second drive roller 4. Two idler sprockets 16 are rotatably supported on the base 2. A chain 17 is attached to the two drive sprockets 15 and the two idler sprockets 16, as shown in Figure 2. By driving the motor 14, the two drive sprockets 15 rotate synchronously in opposite directions. In other words, the first drive roller 3 and second drive roller 4, to which the two drive sprockets 15 are attached, rotate synchronously in opposite directions.

The second drive roller 4 is attached to a drive-side swing arm 5, and as the drive-side swing arm 5 swings, the drive sprocket 15 attached to the rotation shaft of the second drive roller 4 also moves. Therefore, when the drive-side swing arm 5 swings, the length of the chain 17 around the two drive sprockets 15 and the two idler sprockets 16 fluctuates, resulting in an excess or deficiency in the length of the chain 17. In contrast, in this embodiment, the idler 18, idler swing arm 19, and idler elastic body 20 absorb any excess or deficiency in the length of the chain 17. To explain the specific configuration of this embodiment, the idler swing arm 19 has the idler 18 rotatably attached to one end, and the other end is swingably supported on the base 2 at a position where the idler 18 contacts the chain 17. The overall length of the idler swing arm 19 is adjustable, and the idler elastic body 20 biases the idler swing arm 19 in a direction that increases its overall length. In other words, the idler 18 moves due to the idler swing arm 19, while the idler elastic body 20 contacts the chain 17 with a constant pressure, so any excess or deficiency in the length of the chain 17 can be accommodated.

The first driven roller 9 is generally disk-shaped and is rotatably supported on the base 2. The second driven roller 10 is rotatably supported on the driven swing arm 11.

One end of the driven side swing arm 11 is supported to be swingable relative to the base 2. In this embodiment, the driven side swing arm 11 is attached to the base 2 so that it swings around the swing axis C2 at a position where the second driven roller 10 faces the first driven roller 9. A driven side elastic body 12 attached to the base 2 is attached to the other end of the driven side swing arm 11, and the driven side swing arm 11 is biased in a direction that moves the second driven roller 10 toward the first driven roller 9.

An encoder 13 is attached to the central shaft of the first driven roller 9, and the amount of rotation of the first driven roller 9 can be determined by the encoder 13. The encoder 13 corresponds to the "measuring means" in this specification.

The injection hose feeder 1 configured as described above is installed near the borehole DH, as shown in Figure 1. Here, the injection hose H extends horizontally between the first drive roller 3 and the second drive roller 4, and between the first driven roller 9 and the second driven roller 10, and then extends vertically from the first driven roller 9 and is inserted into the borehole DH when installed in the injection hose feeder 1.

In this state, the injection hose H is sandwiched between the first drive roller 3 and the second drive roller 4 by the biasing force of the drive-side elastic body 6. To insert the injection hose H into the borehole DH, the motor 14 is driven in a direction that rotates the first drive roller 3 counterclockwise in FIG. 1. This causes the second drive roller 4 to rotate synchronously with the first drive roller 3 via the chain 17. The second drive roller 4 rotates clockwise in FIG. 1. Therefore, the injection hose H sandwiched between the first drive roller 3 and the second drive roller 4 is fed out in the direction of arrow A shown in FIG. 1 by the first drive roller 3 and the second drive roller 4, allowing the injection hose H to be inserted toward the back of the borehole DH. Furthermore, if the rotation direction of the motor 14 is reversed, the first drive roller 3 rotates clockwise and the second drive roller 4 rotates counterclockwise, feeding the injection hose H in the direction of arrow B, allowing the injection hose H to be pulled up from the borehole DH. The first and second drive rollers 3 and 4 have the same diameter, and the amount of injection hose H fed by the first and second drive rollers 3 and 4 is equal. This reduces the likelihood of slippage between the first and second drive rollers 3 and 4. The biasing force applied by the drive-side elastic body 6 to the second drive roller 4 via the drive-side swing arm 5 can be adjusted using the adjustment unit 7. This allows the biasing force of the drive-side elastic body 6 to be adjusted so that the injection hose H does not collapse and does not slip between the first and second drive rollers 3 and 4. As the depth of the borehole DH increases, the required length of the injection hose H increases, increasing its weight. Therefore, the biasing force of the drive-side elastic body 6 must be adjusted. In contrast, the injection hose feed device 1 of this embodiment is equipped with the adjustment unit 7, allowing the biasing force of the drive-side elastic body 6 to be adjusted according to the length of the injection hose H.

However, when the joint J enters between the first drive roller 3 and the second drive roller 4 as the injection hose H is fed out, the second drive roller 4, which is pressed toward the first drive roller 3 by the biasing force of the drive-side elastic body 6, moves in a direction away from the first drive roller 3. In other words, with the injection hose feed device 1 of this embodiment, even an injection hose H connected with the joint J can be used without any problems.

When the injection hose H is fed out by the first drive roller 3 and the second drive roller 4, the injection hose H is pressed against the first driven roller 9 by the second driven roller 10, causing the first driven roller 9 to rotate as the injection hose H moves. The amount of rotation of the first driven roller 9 is measured by the encoder 13, so the amount of movement of the injection hose H can be measured based on the diameter of the first driven roller 9 and the amount of rotation of the first driven roller 9 obtained from the encoder 13.

That is, when inserting the injection hose H into the borehole DH, the measurement value of the encoder 13 can be used to determine whether the tip of the injection hose H has reached the bottom of the borehole DH. Furthermore, when withdrawing the injection hose H from the borehole DH, the amount of withdrawal of the injection hose H can be determined from the measurement value of the encoder 13. In this chemical injection method, the chemical is injected into the borehole DH by the following procedure: a predetermined amount of chemical is dispensed from the injection hose H, the injection hose H is withdrawn a predetermined length, a predetermined amount of chemical is again dispensed from the injection hose H, and the injection hose H is withdrawn a predetermined length. In other words, in conventional work where an operator manually withdraws the injection hose H, for example, marks are placed on the injection hose H at predetermined intervals, and the operator uses the marks as a guide to withdraw the injection hose H a predetermined amount. However, with the injection hose feed device 1 of this embodiment, the amount of withdrawal of the injection hose H can be determined from the measurement value of the encoder 13, eliminating the need for such marks and reducing the burden on the operator who checks the amount of withdrawal of the injection hose H. When using the measurement value obtained by encoder 13, it is preferable to configure the control unit that controls the operation of injection hose feeder 1 to automatically stop motor 14 after injection hose H has been pulled up a predetermined amount. Alternatively, the injection hose feeder 1 may be configured to allow information to be exchanged between the liquid injection device that dispenses liquid from injection hose H and injection hose feeder 1, so that after injection hose H has been pulled up a predetermined amount and motor 14 has automatically stopped, the liquid injection device automatically injects a predetermined amount of liquid into injection hose H, and then automatically pulls up injection hose H a predetermined amount.

However, when the injection hose H is inserted into or withdrawn from the borehole DH, the outer surface of the injection hose H is often wet from the water or chemical solution introduced into the injection hose H, or from the chemical solution injected into the borehole DH from the injection hose H. When the outer surface of the injection hose H is wet in this way, despite the effect of making the injection hose H less slippery by making the first drive roller 3 and the second drive roller 4 the same diameter as described above, and the effect of adjusting the biasing force of the drive-side elastic body 6 with the adjustment unit 7 to make the injection hose H less slippery, the injection hose H may slip against the first drive roller 3 or the second drive roller 4, preventing the injection hose H from being fed out.

For this reason, as shown in Figure 3, the first drive roller 3 and second drive roller 4 in this embodiment are provided with a first concave surface 3a and a second concave surface 4a, which are recessed radially inward at the center of the width of their outer peripheries. In other words, the contact area of the injection hose H with the first concave surface 3a and the second concave surface 4a is larger than when the outer peripheries of the first drive roller 3 and second drive roller 4 are flat when viewed from the radial outside. This makes it less likely that the injection hose H will slip relative to the first drive roller 3 or second drive roller 4, and the injection hose H can be dispensed even if its outer periphery is wet.

Furthermore, to prevent slippage between the first drive roller 3 and the second drive roller 4 when the outer surface of the injection hose H is wet, it is preferable to provide protrusions that protrude radially outward on the outer surfaces of the first drive roller 3 and the second drive roller 4. The protrusions may be, for example, as shown in FIG. 4(a), circular protrusions P1 that appear circular when viewed from the radially outside, arranged in multiple circumferential and width directions of the first drive roller 3 and the second drive roller 4, or, although not shown, multiple polygonal (triangular, rectangular, etc.) protrusions arranged in multiple circumferential and width directions. Furthermore, as shown in FIG. 4(b), the protrusions may be V-shaped protrusions P2 that appear V-shaped when viewed from the radially outside, arranged in multiple circumferential and width directions.

After extensive research into the protrusions, the inventors found that, compared to the first drive roller 3 and second drive roller 4 in which multiple circular convex portions P1 shown in FIG. 4(a) are arranged on the first concave surface 3a and second concave surface 4a, multiple V-shaped convex portions P2 shown in FIG. 4(b) arranged on the first concave surface 3a and second concave surface 4a are more effective in suppressing slippage even when the outer surface of the injection hose H is wet. Here, the principle of slippage suppression is predicted to be that an arrangement in which multiple V-shaped convex portions P2 are arranged has better drainage properties than an arrangement in which multiple circular convex portions P1 are arranged, making it less likely for water or chemical solution to accumulate between the injection hose H and the first drive roller 3 (or second drive roller 4), thereby suppressing a decrease in the frictional force between them.

Further investigation of the V-shaped protrusions P2 revealed that the effectiveness of preventing slippage when the outer surface of the injection hose H is wet varies significantly depending on the width of the V-shaped protrusions P2 and the pitch between adjacent rows of the V-shaped protrusions P2 in the width direction. As shown in Figure 4(b), when the width of the V-shaped protrusions P2 on the first concave surface 3a and the second concave surface 4a is L1 and the pitch between adjacent rows in the width direction is L2, V-shaped protrusions P2 with L1 of 6 mm and L2 of 6.5 mm were found to be more effective at preventing slippage than V-shaped protrusions P2 with L1 of 11 mm and L2 of 12 mm. The tolerance between L1 and L2 is approximately ±2 mm. Therefore, it is preferable that the width L1 of the V-shaped protrusions P2 be 6±2 mm and the pitch L2 be 6.5±2 mm.

Although one embodiment of the present invention has been described above, the present invention is not limited to this specific embodiment, and unless otherwise specified in the above description, various modifications and variations are possible within the spirit and scope of the present invention as set forth in the claims. Furthermore, the effects of the above embodiment are merely examples of the effects that can be obtained from the present invention, and do not mean that the effects of the present invention are limited to the above-mentioned effects.

For example, when providing the above-mentioned protrusions on the outer peripheral surfaces of the first drive roller 3 and the second drive roller 4, the V-shaped protrusions P2 or the like may be integrally formed and protrude from an elastic material such as rubber that forms the outer peripheral surface of the first drive roller 3 or the like, or a rubber sheet having the V-shaped protrusions P2 or the like may be affixed to this elastic material. When such a rubber sheet having the V-shaped protrusions P2 or the like is affixed, even if the V-shaped protrusions P2 or the like wear down after repeated use, the first drive roller 3 or the like can be easily regenerated by affixing a new sheet.

In addition, in this embodiment, the feed amount of the injection hose H is measured using an encoder 13 attached to the central axis of the first driven roller 9, but other measuring means may also be used, such as a measuring device that reads markings at predetermined intervals attached to the outer surface of the injection hose H.

1: Injection hose feed device 3: First drive roller 3a: First concave surface 4: Second drive roller 4a: Second concave surface 6: Drive side elastic body (elastic body)
DH: drilling hole H: injection hose P1: circular convex portion (protrusion)
P2: V-shaped protrusion (projection)

Claims (5)

An injection hose feeder for inserting an injection hose into a borehole created in the ground or for pulling it up from the borehole,
a first drive roller that contacts the outer peripheral surface of the injection hose;
a second drive roller disposed opposite the first drive roller and in contact with an outer peripheral surface of the injection hose;
an elastic body that presses the second drive roller toward the first drive roller ,
a drive-side swing arm that is swingably supported by a swing shaft is provided;
the second drive roller is rotatably supported by the drive-side swing arm,
The elastic body is connected to the drive side swing arm at a position away from the swing shaft and biases the drive side swing arm in a direction in which the second drive roller approaches the first drive roller . the first drive roller and the second drive roller are driven by a chain so as to rotate synchronously with each other;
2. The injection hose feed device according to claim 1, further comprising an idler that is pressed against the chain to absorb any excess or deficiency in the length of the chain caused by the swinging of the drive-side swing arm. An injection hose feeder for inserting an injection hose into a borehole created in the ground or for pulling it up from the borehole,
a first drive roller that contacts the outer peripheral surface of the injection hose;
a second drive roller disposed opposite the first drive roller and in contact with an outer circumferential surface of the injection hose;
an elastic body that presses the second drive roller toward the first drive roller,
a protrusion protruding radially outward on an outer circumferential surface of the first drive roller and an outer circumferential surface of the second drive roller;
The protrusion is an injection hose feed device formed by multiple V-shaped convex portions that form a V shape when viewed from the radial outside of the first drive roller and the second drive roller, and are arranged along the circumferential direction of the first drive roller and the second drive roller. the first drive roller has an outer circumferential surface having a first concave surface that contacts the outer circumferential surface of the injection hose;
The injection hose feed device according to claim 1 , wherein the outer circumferential surface of the second drive roller has a second concave surface that contacts the outer circumferential surface of the injection hose. 5. An injection hose feed device according to claim 1, further comprising a measuring means that rotates together with the injection hose as it is fed out , to measure the amount of injection hose fed out.