JP7016121B2 - Pile hole filling device and method for collecting pile hole filling - Google Patents

Description

The present invention relates to a pile hole filling collecting device for collecting an unconsolidated pile hole filling filled in a pile hole, and a method for collecting the pile hole filling.

In the construction of piles such as ready-made concrete piles, pile hole fillings such as cement milk or soil cement, which is a mixture of cement milk and earth and sand in the ground, are placed in the pile holes formed in the ground. After building and installing the pile in the pile hole so that the pile is placed in a predetermined position in the ground while the pile hole filling is not solidified, the pile hole filling is solidified and the pile and the pile. Supporting power is developed by integrating with the hole filling.

In order to secure the bearing capacity of the pile, it is important to control the strength of the pile hole filling in the pile root consolidation part (bottom) and the pile circumference in the pile hole.

In addition, in order to control the strength of the solidified part and the pile peripheral part, the unsolidified pile hole filling is collected as a sample at the in-situ in the pile hole where the pile is installed by using a dedicated sampling device. However, it is necessary to confirm the quality such as compressive strength on the ground.

As a technique for collecting an unsolidified pile hole filling from the inside of a pile hole, for example, in Patent Document 1, after excavating a pile hole and constructing a pile hole filling, it is replaced with an excavator (auger head) of an excavator. Then, a sampling device having a configuration for collecting unsolidified pile hole filling from the pile hole is described.

Further, Patent Document 2 describes a sampling device that is incorporated in an excavating device and has a configuration in which a pile hole filling in an unsolidified state is collected immediately after excavating a pile hole and constructing a pile hole filling.

Further, Patent Document 3 describes a sampling device having a plurality of sampling containers and capable of sampling unsolidified pile hole filling from a plurality of locations in the pile hole at the same time.

Japanese Unexamined Patent Publication No. 2012-237192 Japanese Unexamined Patent Publication No. 2014-47531 JP-A-2017-179855

At present, in construction work, it is common to collect pile hole filling only in the root consolidation area, and in civil engineering work, collect pile hole filling only in the pile peripheral area to check the quality.

However, in the future, it is expected that there will be an increasing need to collect a plurality of types of cement-blended pile hole fillings at different depths in one pile hole and check the quality of each.

In the configuration of Patent Document 1 and Patent Document 2, since there is only one collection port and collection container and the pile hole filling is collected from only one place in the pile hole, the pile hole has a different depth. When collecting the pile hole filling from a plurality of places, it is necessary to collect the pile hole filling collected by the collecting device and repeat the work of collecting the pile hole filling again.

If the work time becomes long due to the repetition of such sampling work, the consolidation of the pile hole filling may proceed, and the pile hole filling may not be smoothly collected.

Further, in the configuration of Patent Document 3, since a plurality of sampling ports are opened and closed at the same time, the pile hole filling can be simply collected from a plurality of locations in the pile hole, and the pile hole filling can be collected at an arbitrary plurality of depths. It cannot be collected.

Therefore, there has been a demand for a technique that can easily collect the pile hole filling from any plurality of collection positions in the pile hole.

The present invention has been made in view of these points, and is a pile hole filling collecting device capable of easily collecting pile hole filling from any plurality of collecting positions in a pile hole, and a method for collecting pile hole filling. The purpose is to provide.

The pile hole filling collecting device according to claim 1 is a pile hole filling collecting device that collects an unsolidified pile hole filling from a pile hole, and is a plurality of collecting units that can be inserted into the pile hole. A fluid pressure pump for supplying fluid, a first fluid pressure line and a second fluid pressure line connected to the fluid pressure pump, and each sampling unit accommodates the pile hole filling. A possible sampling chamber, a sampling port provided in the sampling chamber, an opening / closing unit that is movable in the sampling chamber and can open and close the sampling port, the first fluid pressure line and the second fluid. It has a drive device which is a fluid pressure cylinder connected to a pressure line and moves the opening / closing portion, and a switching means for switching a communication state between each fluid pressure line and the drive device, and is fluid from the fluid pressure pump. Is supplied to each of the fluid pressure lines, and the communication state between the respective fluid pressure lines and the drive device is operated by the switching means, so that the first fluid pressure line or the second fluid pressure line can be operated. Any of the driving devices of the sampling unit can be individually driven by the fluid supplied through the sampling unit, and the opening / closing portions can move independently to open / close the sampling port.

The pile hole filling collecting device according to claim 2 is the pile hole filling collecting device according to claim 1 , wherein the collecting unit is provided in the collecting chamber and is housed in the collecting chamber. It has a discharge port for discharging an object, and the discharge port is arranged below the collection port when the insertion direction of the collection unit into the pile hole is the vertical direction of the collection unit. It is a thing.

The pile hole filling collecting method according to claim 3 is a pile hole filling collecting method using the pile hole filling collecting device according to claim 1 or 2 , and is a pile provided in the ground. A pile hole filler is constructed in the hole, and at least one of the sampling units is placed in an unsolidified pile hole filling so that the sampling port in at least one sampling unit is arranged at a predetermined position in the pile hole. The section is buried, and the opening / closing portion of the sampling unit is moved by driving the drive device to open the sampling port, and the unsolidified pile hole filling flows into the sampling chamber from the sampling port. By driving the drive device, the opening / closing portion of the sampling unit is moved to close the sampling port.

The method for collecting the pile hole filling according to claim 4 is the method for collecting the pile hole filling according to claim 3 , wherein the pile hole filling at one collection position in the pile hole by the one collecting unit is used. After collecting the pile hole, the pile hole filling device is still inserted in the pile hole, and the pile hole filling at another collection position in the pile hole is collected by another collection unit. be.

According to the present invention, since the drive device of each sampling unit can be driven individually and each opening / closing portion can be moved independently, the pile hole filling can be easily sampled from any plurality of sampling positions in the pile hole. can.

It is sectional drawing which shows the structure of the pile hole filling collection apparatus which concerns on one Embodiment of this invention. It is a schematic diagram which shows the opening state of the sampling port of the 1st sampling unit of the pile hole filling packing apparatus. It is a schematic diagram which shows the blockage state of the collection port of the 1st collection unit of the pile hole filling collection device of the same as above. It is a schematic diagram which shows the opening state of the collection port of the 2nd collection unit of the pile hole filling collection device of the same as above. It is a schematic diagram which shows the blockage state of the collection port of the 2nd collection unit of the pile hole filling collection device of the same as above. It is an operation explanatory drawing at the time of collecting the pile hole filling by the pile hole filling collecting device of the same as above. It is operation explanatory drawing following FIG. It is operation explanatory drawing following FIG. It is operation explanatory drawing following FIG.

Hereinafter, the configuration of one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a pile hole filling device, which is an unconsolidated cement milk or soil cement that is inserted into a pile hole 2 provided in the ground and filled in the pile hole 2 to be built. The pile hole filling material 3 and the like are collected.

The pile hole filling collecting device 1 includes a mounting portion 4 attached to the tip of an excavating device such as an auger in place of an excavating bit, and a plurality (for example, two) sampling units 5 connected to the mounting portion 4. 6 and. In the following, the vertical direction is set with reference to the state in which the pile hole filling collecting device 1 is inserted into the pile hole 2. That is, the axial direction, which is one direction (insertion direction) when inserted into the pile hole 2, is the vertical direction.

Each sampling unit 5 and 6 has a substantially columnar unit main body 7 that can be inserted into the pile hole 2, and flange portions 8 provided at both ends of the unit main body 7 in the axial direction (vertical direction). There is. Then, by connecting the flange portion 8 located at the upper end portion of one sampling unit 5 and the flange portion 9 of the mounting portion 4, the mounting portion 4 and the sampling unit 5 are connected in the vertical direction. Further, by connecting the flange portion 8 located at the lower end portion of one sampling unit 5 and the flange portion 8 located at the upper end portion of the other sampling unit 6, a plurality of sampling units 5 and 6 can be moved up and down. Connected sequentially in the direction.

Each of the sampling units 5 and 6 has a sampling chamber 11 capable of accommodating the pile hole filling 3, a sampling port 12 provided on the side surface of the sampling chamber 11, and a sampling port 12 movably provided in the sampling chamber 11. An opening / closing unit 13 that can be opened / closed, a discharge port 14 for discharging the pile hole filling 3 provided in the collection chamber 11 and housed in the collection chamber 11, and a hydraulic pressure as a drive device for moving the opening / closing unit 13. It has a cylinder 15.

The sampling chamber 11 is a hollow portion provided below the central portion in the vertical direction in the unit main body 7, and can accommodate a predetermined amount of pile hole filling 3 required for quality confirmation.

The collection port 12 is a rectangular opening provided in the collection chamber 11 slightly above the center in the vertical direction, and the unconsolidated pile hole filling 3 in the pile hole 2 from the collection port 12 is the collection port 12. It flows in.

The opening / closing portion 13 is a columnar member that can slide in the vertical direction in the unit main body 7. Then, by moving in the vertical direction with respect to the collection chamber 11, it is possible to switch between an ascending state located above the collection port 12 and a descending state in which the collection port 12 overlaps the collection port 12 and is blocked in a side view. That is, the collection port 12 is opened when the opening / closing portion 13 rises from the lowered state, and the sampling port 12 is closed when the opening / closing portion 13 descends from the raised state.

The discharge port 14 is provided below the collection port 12 in the collection chamber 11. Specifically, in the collection unit 6 arranged at the lowermost side among the collection units 5 and 6, the removable lid 16 arranged at the bottom of the collection chamber 11 is manually removed. It will be released. Further, in the collection unit 5 arranged on the upper side of the collection unit 6, the lid 17 arranged below the collection port 12 on the side surface of the collection chamber 11 and provided removable can be manually removed to open the collection unit 5. Will be done. Then, after pulling up the pile hole filling collecting device 1 in the state where the pile hole filling 3 is housed in the collecting chamber 11 to the ground, the lids 16 and 17 of the collecting units 5 and 6 are removed to open the pile hole filling state. The pile hole filling 3 is discharged from the collection chamber 11 through the discharge port 14.

One hydraulic cylinder 15 is provided for each sampling chamber 11, and a cylinder body 18 fixed to the sampling units 5 and 6 and a rod that can move forward and backward with respect to the cylinder body 18 Has 19 and.

An opening / closing portion 13 is fixed to the tip of the rod 19. That is, when the rod 19 moves back and forth with respect to the cylinder body 18 by hydraulic pressure, the opening / closing portion 13 moves up and down together with the rod 19, and the sampling port 12 is opened / closed.

Here, the pile hole filling collecting device 1 is provided with a hydraulic oil supply means 21 as a fluid supply means for supplying the hydraulic oil as a fluid to the hydraulic cylinder 15 at a predetermined pressure.

The hydraulic oil supply means 21 is connected to a hydraulic pump as a hydraulic pump (not shown), the hydraulic cylinders 15 of the sampling units 5 and 6, and the hydraulic pump, and hydraulic oil from the hydraulic pump is collected from the sampling units 5 and 6. It has a first hydraulic line 22 as a first hydraulic pressure line for supplying to the cylinder body 18, and a second hydraulic line 23 as a second hydraulic pressure line.

Further, of the connection portions 24a and 24b with the cylinder main body 18 in the first hydraulic line 22, the connection portion 24a with the cylinder main body 18 of the sampling unit 5 and the connection with the cylinder main body 18 in the second hydraulic line 23. Of the parts 24c and 24d, the connection part 24d of the sampling unit 6 with the cylinder body 18 is provided with sequence valves 25 and 26 as switching means for switching the communication state between the hydraulic lines 22 and 23 and the cylinder body 18. ing. Then, by operating the communication state between each hydraulic line 22 and 23 and each cylinder body 18 by the sequence valves 25 and 26, the fluid is supplied to the hydraulic cylinder 15 through the first hydraulic line 22 or the second hydraulic line 23. Any hydraulic cylinder 15 is selectively driven by the fluid to be driven.

More specifically, the sequence valves 25 and 26 are valves that open only in the direction toward the cylinder body 18 when a pressure equal to or higher than a predetermined value is applied, and the opening pressure thereof is set to 20 MPa, for example.

Then, as shown in FIG. 2, hydraulic oil is supplied from the first hydraulic line 22 by a hydraulic pump, and a pressure of 20 MPa is introduced by the hydraulic oil, so that the sequence valve 25 is opened and the rod 19 is cylinderd. It is pushed up so as to be inserted into the main body 18, the opening / closing portion 13 rises, and the collection port 12 of the collection unit 5 opens. In the sampling unit 6, hydraulic oil flows from the first hydraulic line 22 into the cylinder body 18, and the sampling port 12 is maintained in a closed state.

On the other hand, as shown in FIG. 3, hydraulic oil is supplied from the second hydraulic line 23 by a hydraulic pump, and a pressure of 10 MPa is introduced by the hydraulic oil, so that the hydraulic oil is directly used in the cylinder body 18 in the sampling unit 5. The rod 19 flows inward and is pushed downward so as to be exposed to the outside of the cylinder body 18, the opening / closing portion 13 is lowered, and the sampling port 12 is closed. In the sampling unit 6, since the sequence valve 26 does not open with a hydraulic pressure of 10 MPa, hydraulic oil does not flow into the cylinder body 18 from the second hydraulic line 23, and the sampling port 12 is maintained in a closed state. ..

Further, as shown in FIG. 4, hydraulic oil is supplied from the second hydraulic line 23 by a hydraulic pump, and a pressure of 20 MPa is introduced by the hydraulic oil, so that the sequence valve 26 is opened and the rod 19 is a cylinder. It is pushed upward so as to be inserted into the main body 18, the opening / closing portion 13 rises, and the collection port 12 of the collection unit 6 opens. In the sampling unit 5, the hydraulic oil flows into the cylinder body 18 from the second hydraulic line 23, so that the sampling port 12 is maintained in a closed state.

On the other hand, as shown in FIG. 5, hydraulic oil is supplied from the first hydraulic line 22 by a hydraulic pump, and a pressure of 10 MPa is introduced by the hydraulic oil, so that the hydraulic oil is directly used in the cylinder body 18 in the sampling unit 6. The rod 19 flows inward and is pushed downward so as to be exposed to the outside of the cylinder body 18, the opening / closing portion 13 is lowered, and the sampling port 12 is closed. In the sampling unit 5, since the sequence valve 25 does not open with a hydraulic pressure of 10 MPa, hydraulic oil does not flow into the cylinder body 18 from the first hydraulic line 22, and the sampling port 12 is maintained in a closed state. ..

As described above, in the pile hole filling collecting device 1, the hydraulic cylinders 15 in the collecting units 5 and 6 can be individually driven, and the opening / closing portions 13 can be moved independently.

Next, a method of collecting the pile hole filling 3 using the pile hole filling collecting device 1 will be described.

First, a pile hole 2 is excavated in the ground by an excavator, and a pile hole filling 3 such as cement milk (pile circumference fixing portion 27) and soil cement (root consolidation portion 28) is constructed in the pile hole 2.

After the excavator is pulled out from the pile hole 2, the tip excavation bit of the excavator is replaced with the pile hole filling collecting device 1.

As shown in FIG. 6, the pile hole filling collecting device 1 is inserted into the pile hole 2, and the pile hole filling collecting device 1 is buried in the unconsolidated pile hole filling 3.

Further, as shown in FIG. 7, in a state where the sampling port 12 of the sampling unit 5 is arranged at a predetermined position (predetermined depth) of the pile circumference fixing portion 27 in the pile hole 2, the first hydraulic line 22 is 20 MPa. Introduce hydraulic oil. By introducing the hydraulic oil into the cylinder body 18 of the sampling unit 5 from the first hydraulic line 22, the rod 19 and the opening / closing portion 13 are raised, the sampling port 12 of the sampling unit 5 is opened, and the pile circumference fixing portion 27 is opened. Pile hole filling 3 flows into the sampling chamber 11 of the sampling unit 5.

After accommodating the pile hole filling 3 in the sampling chamber 11 of the sampling unit 5, the supply of hydraulic oil from the first hydraulic line 22 is stopped, and the hydraulic oil is introduced from the second hydraulic line 23 at 10 MPa. By introducing the hydraulic oil from the second hydraulic line 23 into the cylinder body 18 of the sampling unit 5, the rod 19 and the opening / closing portion 13 are lowered to close the sampling port 12 of the sampling unit 5.

With the collection port 12 of the collection units 5 and 6 closed, the pile hole filling collection device 1 is inserted deeper into the pile hole 2.

Further, as shown in FIG. 8, the sampling port 12 of the sampling unit 6 operates at 20 MPa from the second hydraulic line 23 in a state where the sampling port 12 of the sampling unit 6 is arranged at a predetermined position (predetermined depth) of the root consolidation portion 28 in the pile hole 2. Introduce oil. By introducing the hydraulic oil into the cylinder body 18 of the sampling unit 6 from the second hydraulic line 23, the rod 19 and the opening / closing portion 13 are raised, the sampling port 12 of the sampling unit 6 is opened, and the sampling unit 6 is sampled. The pile hole filling 3 flows into the chamber 11.

After accommodating the pile hole filling 3 in the sampling chamber 11 of the sampling unit 6, the supply of hydraulic oil from the second hydraulic line 23 is stopped, and the hydraulic oil is introduced from the first hydraulic line 22 at 10 MPa. By introducing the hydraulic oil into the cylinder body 18 of the sampling unit 6 from the first hydraulic line 22, the rod 19 and the opening / closing portion 13 are lowered, and the sampling port 12 of the sampling unit 6 is closed.

Then, as shown in FIG. 9, with the sampling port 12 of the sampling units 5 and 6 closed, the pile hole filling collecting device 1 is pulled up to the ground, and the pile hole filling housed in each of the sampling units 5 and 6 is filled. The object 3 is discharged from the discharge port 14 and collected.

The pile hole filling material 3 thus collected is, for example, injected into a predetermined mold, cured to a predetermined age, demolded and shaped, and subjected to a uniaxial compressive strength test to check the quality.

Next, the effect of the above embodiment will be described.

According to the above embodiment, since the hydraulic cylinders 15 of the sampling units 5 and 6 can be driven individually and the opening / closing portions 13 can be moved independently, any plurality of sampling positions in the pile hole 2 can be obtained. The pile hole filling 3 can be easily and accurately collected from the cylinder. That is, as shown in FIGS. 6 to 9, the pile hole filling 3 can be collected at arbitrary positions in, for example, the pile circumference fixing portion 27 and the root consolidation portion 28 by inserting the pile hole 2 into the pile hole 2 once.

Therefore, as compared with the case where the collection is repeated at each location as in the conventional case, the work time can be shortened by efficiently collecting the pile hole filling 3 at any plurality of locations, and the increase in work cost can be suppressed. In addition, if a defect is found at the visual level when it is recovered, it is relatively easy to correct it by reconstructing the pile hole filling material 3.

Further, since the time for collecting work can be shortened, the pile hole filling 3 can be easily recovered in an unconsolidated and fluid state, and can be more appropriately subjected to a quality confirmation test.

Further, the pile hole filling 3 can be accurately collected at each of a plurality of predetermined positions. For example, as shown in FIGS. 6 to 9, not only the pile circumference fixing portion 271 and the root compaction portion 281 are collected, but also the pile. It can be applied to the case of collecting at 272 points of the peripheral fixing part and the case of collecting at 282 places of the root consolidation part, and can accurately correspond to various collection patterns.

Since it can be attached to an existing excavation device by replacing it with a tip excavation bit, it can be applied to an existing ready-made concrete pile method (for example, a pre-boring method).

In a configuration in which each hydraulic cylinder 15 is individually driven by a hydraulic pump, a first hydraulic line 22, a second hydraulic line 23, and sequence valves 25 and 26, the pile hole 2 is based on the hydraulic operation and data. The position where the collection port 12 is opened and closed by moving the opening / closing unit 13 can be confirmed in real time on the ground.

In the collection units 5 and 6, since the discharge port 14 is arranged below the collection port 12, the collected pile hole filling 3 can be smoothly collected.

In the above embodiment, the opening / closing portions 13 of the sampling units 5 and 6 are independently moved by using the fluid pressure circuit, but the configuration is not limited to this, and the opening / closing portions 13 are not limited to such a configuration. Can be changed as appropriate if is a configuration that can be moved independently.

Further, although the configuration is such that the discharge port 14 is arranged below the collection port 12, the position of the discharge port 14 can be changed as appropriate without being limited to such a configuration, and the collection port 12 and the discharge port 14 can be changed as appropriate. It may be configured to also serve as.

The pile hole filling collecting device 1 has a configuration in which two sampling units 5 and 6 are sequentially connected in the axial direction, but the configuration is not limited to such a configuration, and the number of sampling units can be appropriately changed.

Further, the pile hole filling collecting device 1 is configured to be attached in place of the excavating bit of the excavating device, but is not limited to such a configuration, and is attached between the excavating head and the screw shaft of the excavating device, for example. It may be configured as such.

1 Pile hole filling device 2 Pile hole 3 Pile hole filling 5 Collection unit 6 Collection unit
11 Collection room
12 Collection port
13 Opening and closing part
14 Outlet
15 Hydraulic cylinder as a drive
22 First hydraulic line as first fluid pressure line
23 Second hydraulic line as second fluid pressure line
25 Sequence valve as a switching means
26 Sequence valve as a switching means

Claims (4)

It is a pile hole filling collecting device that collects unconsolidated pile hole filling from the pile hole.
Multiple sampling units that can be inserted into the pile holes and
A fluid pressure pump that supplies fluid and
A first fluid pressure line and a second fluid pressure line connected to the fluid pressure pump are provided.
Each sampling unit includes a sampling chamber capable of accommodating the pile hole filling, a sampling port provided in the sampling chamber, an opening / closing unit movably provided in the sampling chamber and capable of opening and closing the sampling port, and the above . A switching means for switching between a drive device which is a fluid pressure cylinder connected to the first fluid pressure line and the second fluid pressure line and moves the opening / closing portion, and a communication state between each fluid pressure line and the drive device. And have
A fluid is supplied to each of the fluid pressure lines from the fluid pressure pump, and the communication state between the fluid pressure lines and the drive device is operated by the switching means to operate the first fluid pressure line or the first fluid pressure line. The fluid supplied through the fluid pressure line 2 can individually drive any of the driving devices of each sampling unit, and the opening / closing portions can move independently to open / close the sampling port. A featured pile hole filling collection device . The sampling unit has a discharge port provided in the sampling chamber and for discharging the pile hole filling contained in the sampling chamber.
The pile hole according to claim 1 , wherein the discharge port is arranged below the collection port when the insertion direction of the collection unit into the pile hole is the vertical direction of the collection unit. Filling device. A method for collecting pile hole filling using the pile hole filling collecting device according to claim 1 or 2 .
A pile hole filling material is constructed in the pile hole provided in the ground, and
At least a part of the sampling unit is buried in the unconsolidated pile hole filling so that the sampling port in the at least one sampling unit is arranged at a predetermined position in the pile hole.
By driving the drive device, the opening / closing portion of the sampling unit is moved to open the sampling port.
The unconsolidated pile hole filling flows into the sampling chamber from the sampling port, and the unconsolidated pile hole filling flows into the sampling chamber.
A method for collecting pile hole filling, which comprises moving the opening / closing portion of the collection unit by driving the drive device to close the collection port. After collecting the pile hole filling at one collection position in the pile hole with one of the above collection units,
The claim is characterized in that the pile hole filling device is still inserted in the pile hole, and the pile hole filling at another collection position in the pile hole is collected by another collection unit. 3. The method for collecting a pile hole filling material according to 3.

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