JPH0216813B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention involves drilling a pilot hole in the ground and then squirting out a ground improvement agent such as cement milk to modify and strengthen the ground around the pilot hole. Ground improvement methods called columnar compacted ground improvement method, fan-shaped compacted ground improvement method, plate-shaped compacted ground improvement method, etc. are used, and after drilling a pilot hole, high-pressure water is injected horizontally into the ground. form a cylindrical cavity,
The present invention relates to a ground remodeling device suitable for application to a ground remodeling method in which concrete or the like is poured into the formed cavity to form a new ground.

(b) Background of the technology During bank protection work and structure construction work, water stop walls and artificial ground construction work is often carried out, but in such construction work, ground improvement agents such as cement milk are added to the soil. Ground improvement and remodeling work will be carried out by injecting concrete into the soil and forming an artificial concrete base in the soil.

Generally, when constructing water-stop walls, etc., a construction method is used in which a ground improvement agent is spouted through a pilot hole without rotating the nozzle and pulled up (this construction method uses multiple nozzles, so the ground is improved in a fan-like manner). The fan-shaped compacted ground improvement method that is being developed, the number of nozzles is 1
Therefore, it is classified as a plate-shaped consolidated ground improvement method that improves the ground in a plate-shaped manner. ) is used,
When constructing artificial ground, etc., a construction method is used in which ultra-high pressure water or high-pressure ground improvement agent is jetted out while rotating a nozzle.

(c) Conventional technology and problems Conventionally, ground modification equipment used for the lifting method with a fixed nozzle and equipment that performs soil modification by rotating the nozzle are similar in terms of work, but This was a completely separate and independent device, resulting in a lot of material and economic waste.

In addition, the nozzle for spraying the ground improvement agent is
As the number increases, the number of ancillary equipment such as pumps also increases proportionately. Therefore, the fan-shaped consolidation ground improvement method, which uses multiple nozzles to spray ground improvement agent in a fan shape, is simply a plate-shaped soil improvement method in which the soil improvement agent is sprayed from one nozzle. The disadvantage of this method is that the equipment required is larger than that of the consolidated ground improvement method.

Furthermore, when performing ground modification by rotating the nozzle, in order to prevent the high-pressure tube from getting entangled with the joint between the rotating nozzle and the high-pressure tube that supplies high-pressure water, etc. to the nozzle part, due to the rotation of the nozzle. A swivel joint is provided.
However, swivel joints that can withstand hundreds of atmospheres of high-pressure water ejection pressure not only have a precise structure, but are also extremely expensive, subject to great impact, and can only be handled roughly. There are many practical problems in the field.

In addition, when trying to rotate the nozzle within a predetermined angle range, the rotation angle range can be easily confirmed on site.
Furthermore, it would be desirable to have a structure that allows the setting angle to be easily changed, but the reality is that no ground excavation device that can do this has been developed yet.

(d) Purpose of the Invention In order to eliminate the above-mentioned drawbacks, the present invention aims to improve various types of ground, such as column-shaped compacted ground improvement method, fan-shaped compacted ground improvement method, plate-shaped compacted ground improvement method, etc., using one device. The first objective is to provide a ground modification device that can implement the construction method, and furthermore, it is a ground modification device with a simple configuration that requires small-scale incidental equipment and does not require a swivel joint. The second purpose is to provide the following.

A third object of the present invention is to provide a ground modification device that can easily confirm and change the rotation angle range of the nozzle.

(e) Structure of the Invention That is, the present invention supports an excavation pipe holding and rotation device on a guide means so as to be movable in the vertical direction, and a chuck is provided on the excavation pipe holding and rotation device so as to be freely rotatable in forward and reverse directions. The excavation pipe is provided on the chuck so that it can be gripped and released, and one or more setters are provided on a cylindrical externally exposed part that rotates together with the chuck of the excavation pipe holding and rotating device, at any position on the outer periphery of the exposed part. A setter detecting means is removably provided and is located at a position facing the externally exposed portion of the excavation pipe holding and rotating device, and detects the setter and outputs an electrical detection signal. A rotary drive means, which is rotationally controlled in forward and reverse directions by a signal, is connected to the chuck.

(f) Embodiments of the invention Hereinafter, embodiments of the invention will be specifically described based on the drawings.

FIG. 1 is a front view showing an embodiment of the ground modification device according to the present invention, FIG. 2 is a plan view showing an example of the excavation pipe holding and rotation device, and FIG. 3 is the ground modification device 1 shown in FIG. 1. FIG. 4 is a front view showing a case where ground improvement is carried out by the columnar consolidation ground improvement method using the same method, and FIG. 4 is a plan view showing another example of the excavation pipe holding and rotation device.

As shown in FIG. 1, the ground modification device 1 includes a mobile heavy machine 2 such as a crawler crane, and the mobile heavy machine 2 is provided with a driver's seat 2a, crawlers 2b, 2b, and the like. Further, a columnar leader 3 is erected on the mobile heavy equipment 2 via a support frame 5, and a guide rail 3a is formed on the leader 3 in the vertical direction in the figure. As shown in FIG. 2, the guide rail 3a is provided with a drilling pipe holding and rotating device 6 that engages with a guide groove 6a formed on the left side of the drilling pipe holding and rotating device 6 in the figure. One end of a wire 7, the other end of which is wound around a winch (not shown), is connected to the excavation pipe holding and rotating device 6. Therefore, by driving the winch in forward and reverse directions to feed out or retract the wire 7,
The excavation pipe holding and rotating device 6 can freely move in the vertical direction along the guide rail 3a of the leader 3, that is, in the directions of arrows C and D.

The excavation pipe holding and rotation device 6 is provided with a chuck 9 that can be rotated freely in the directions of arrows A and B by a rotation driving means 10 such as a motor built in the excavation pipe holding and rotation device 6. Two setters 11, 11 are provided on the exposed cylindrical outer periphery.
It is removably installed at any position on the outer periphery of the chuck 9 using screws or the like. Therefore, by mounting the setter 11 at an appropriate position on the outer periphery of the chuck 9, the setting angle α between the setters 11, 11 can be changed from 0°.
It is possible to set it arbitrarily within the range of 360.
Further, a limit switch 12 is provided on the excavation pipe holding/rotating device 6 so as to be able to freely abut and engage with the setter 11.
The OFF signal causes the rotation drive means 10 in the excavation pipe holding and rotation device 6 to rotate in forward and reverse directions.

A hollow cylindrical rod 13 constituting an excavation pipe 15 is inserted through the chuck 9 so that it can be gripped and fixed, and flanges 13a, 13a for connection are formed at both upper and lower ends of the rod 13. Rod 1
3, in the lower part of FIG. Even when the rods 13 are rotated forward and backward in the direction B, the connections between the rods 13 do not become loose as would occur when connecting with screws. The lower end of the excavation pipe 15 has an opening 15a open to the outside, and a drilling bit 16 is attached to the lower end. Further, a nozzle 17 and an ultrasonic ranging sensor 19 are provided slightly above the bit 16, and a high pressure liquid supply pipe 20 and a compressed air supply pipe 21 are connected to the nozzle 17. The high-pressure liquid supply pipe 20 and the compressed air supply pipe 21 are installed along the outer periphery of the excavation pipe 15 in the axial direction of the excavation pipe 15, that is, upward in the figure, and their tips are rotated to hold the excavation pipe. Device 6
It reaches the lower part, where it is connected to flexible tubes 22 and 23 having flexibility. On the other hand, a flexible tube 25 that is similarly flexible is connected to the upper end of the excavation tube 15.

Since the ground modification device 1 has the above-described configuration, in order to construct an artificial ground using the ground modification device 1, first, the setter 11 provided on the chuck 9 of the excavation pipe holding and rotation device 6 is As shown in the figure,
Leave only one piece and remove the other one, and in that state, connect the excavation pipe holding rotation device 6 to the leader 3 using the wire 7.
The chuck 9 is pulled up along the guide rail 3a in the direction of arrow C, and then the rotary drive means 10 in the excavation pipe holding and rotating device 6 is driven to rotate the chuck 9, for example, in the direction A. When the chuck 9 rotates, the drilling pipe 15 held by the chuck 9 also rotates in the direction A, and the bit 16 at the tip of the drilling pipe 15 is directed downward in FIG. 1 due to the weight of the drilling pipe holding and rotating device 6 and the drilling pipe 15. and start excavation. The excavation pipe holding rotation device 6 moves in the D direction along the leader 3, and the excavation pipe 1
5. Therefore, as the bit 16 moves downward, a pilot hole 26 is excavated in the soil in directions C and D as the locus of the bit 16. Mud water 27 is supplied to the pilot hole 26, and its hydrostatic pressure prevents the pilot hole 26 from collapsing, and the muddy water 27 in the pilot hole 26 is pumped through the flexible tube 25 by a suction pump (not shown).
The excavation pipe 15 is slurried together with the excavated earth and sand generated by the bit 16, and is passed through the excavation pipe opening 15a.
It is sucked up and discharged to the outside of the pilot hole 26 through each internal rod 13. The discharged muddy water 27 is separated from the soil and sand that was sucked in together, and then poured into the pilot hole 2.
6 and is used continuously for drilling.

During excavation, the chuck 9 that rotationally drives the excavation pipe 15 rotates through a maximum of 360° and the actuator 11
contacts the limit switch 12 and operates the limit switch 12. Then, the rotary drive means 10, which had been rotating in the normal direction to rotate the chuck 9 and therefore the excavation pipe 15 in the A direction, rotates in the reverse direction and now rotates the excavation pipe 15 in the B direction. This reversal continues until the chuck 9 rotates 360 degrees in the B direction and the setter 11 comes into contact with the limit switch 12 again, at which point the excavation pipe 15 is again driven to rotate in the A direction. That is, the excavation pipe 15 continues to excavate while repeating forward and reverse rotation within an angular range of 360 degrees, but since the excavation pipe 15 does not rotate more than 360 degrees, the upper part of the excavation pipe 15 is The discharge of muddy water 27 from the fixedly connected flexible tube 25 is carried out through the flexible tube 2
It is done smoothly without giving extreme twist to 5.

In this way, the pilot hole 26 is excavated to a certain depth, and when the excavation pipe holding rotary device 6 reaches below the leader 3, the driving of the rotary drive means 10 is stopped to stop the excavation operation, and the excavation by the chuck 9 is stopped. The grip on the pipe 15 is stopped, the flexible tube 25 at the upper end of the excavation pipe 15 is removed, and the rod 13 is newly connected. Therefore, only the excavation pipe holding and rotating device 6 was pulled up in the C direction along the leader 3, and
The excavation pipe 15 is gripped via the newly connected rod 13 portion. Next, the flexible tube 25 is fixedly connected to the upper end of the newly connected rod 13, and in this state, the excavation tube holding and rotating device 6 is connected again.
The pilot hole 26 is rotated by driving the rotary drive means 10 of
Start excavation. In this way, the pilot hole 26
is gradually formed in the D direction, and when the depth reaches DP, the excavation by the bit 16 is stopped and the excavation pipe holding rotation device 6 is pulled up together with the excavation pipe 15 by L1. Therefore, this time, ultra-high pressure water 29 is supplied from the flexible tube 22 and compressed air 30 is supplied from the flexible tube 23 to the nozzle 17 via the high-pressure liquid supply pipe 20 and the compressed air supply pipe 21, and is ejected from there. At this time,
As the excavation pipe holding and rotating device 6 is gradually lowered in the D direction and the excavation pipe 15 is rotated back and forth through 360 degrees in the forward and reverse directions in the same manner as described above, ultra-high pressure water 29 is generated in the ground 31. A cylindrical cavity 32 is formed.

At this time, since the excavation pipe 15 only rotates within an angular range of 360°, the connection state between the high-pressure liquid supply pipe 20 and compressed air supply pipe 21 fixed to the excavation pipe 15 and each flexible tube 22, 23 is as follows. The tubes are well maintained without getting entangled, the supply of ultra-high pressure water 29 and compressed air 30 is carried out smoothly, and therefore the formation of the cavity 32 is carried out without any hindrance. The shape of the cavity 32 during excavation is determined by transmitting ultrasonic waves 33 from the ultrasonic distance measurement sensor 19 to the cavity wall surface 32a, capturing the reflected waves, and measuring the distance from the ultrasonic distance measurement sensor 19 to the wall surface 32a. By doing so, you can understand accurately.

In this way, a cavity 32 of a predetermined size is formed in the ground 31.
When the C is formed inside the cavity 32, the nozzle 17 is inserted from the bottom of the cavity 32 while rotating the excavation pipe 15.
While pulling up the flexible tube 22 in the direction
A soil improvement agent such as cement milk is supplied from the nozzle 17 to the nozzle 17, and the soil improvement agent is injected into the cavity 32 from the nozzle 17 at high pressure to fill the cavity 32 with the soil improvement agent (the excavation pipe 15 is used as a tremie pipe). (A ground improvement agent such as concrete may be filled into the cavity 32 and the pilot 26 through the opening 15a.) When the excavation pipe 15 is pulled up in the direction C while filling the ground improvement agent into the cavity 32 and the pilot hole 26, the filled improvement agent solidifies and a strong artificial ground is constructed in the ground 31. become.

Now that one artificial ground has been constructed, the mobile heavy equipment 2 is moved, a new pilot hole 26 is drilled in a position adjacent to the constructed artificial ground, a cavity 32 is constructed, and a ground improvement agent is added. The artificial ground is expanded by filling the cavity 32 with the previously constructed cavity 32 (in which the soil improvement agent has already been filled and solidified).

In addition, in the above-mentioned embodiment, an example was described in which the ground modification device 1 according to the present invention was used in a case where a cavity 32 was excavated in the ground 31 and then a ground improvement agent was cast to form an artificial ground. The ground modification device 1 according to the present invention is not limited to such a construction method, and as shown in FIG. High pressure, horizontal
The so-called columnar solidified ground improvement method also involves injecting in a circular manner in a 360° direction while rotating and raising the nozzle 17, and similarly forming a cylindrical improved ground 36 using earth and sand as aggregate. Of course, it can be used.

Furthermore, if the two setters 11 of the chuck 9 of the excavation pipe holding and rotation device 6 are set at the setting angle α as shown in FIG. Since the rotary drive means 10 is rotated in reverse, the chuck 9 and therefore the excavation pipe 15 can be swung within a set angle α. This means that the soil improvement agent can be injected into the soil from the pilot hole 26 within the range of angle α, and by lifting the nozzle 17 upward while swinging at the angle α, so-called fan-shaped consolidation Construction method becomes possible. In addition, when the rotary drive means 10 is not driven, the excavation pipe 15 and therefore the nozzle 17 face only in a certain direction, so by injecting the ground improvement agent into the soil in this state, so-called plate-shaped consolidation is achieved. It also becomes possible to use soil improvement methods.

Note that the rotation angle setting means for the excavation pipe 15, such as the limit switch 12 and the setting element 11, are
Any configuration may be used as long as the rotation angle of 5 can be set within the range of 0° to 360°, and it is not limited to a contact type as in this example, but also a non-contact type using magnetism. I can think of various things.

Furthermore, the guide means such as the leader 3 that supports and guides the excavation pipe holding and rotating device 6 is not necessarily the same as the moving heavy equipment 2.
Although it is not necessary that the movable heavy equipment 2 is provided with a guide means, it becomes possible to efficiently excavate a large number of pilot holes 26.

(g) Effects of the Invention As described above, according to the present invention, the excavation pipe holding and rotation device 6 is supported by the guide means such as the leader 3 so as to be movable in the vertical direction, and the excavation pipe holding and rotation device 6 is A chuck 9 is provided so as to be freely rotatable in forward and reverse directions, and furthermore, a drilling pipe 15 is provided on the chuck so that it can be gripped and released, and one piece is provided in a cylindrical externally exposed portion that rotates together with the chuck 9 of the drilling pipe holding and rotating device 6. The above setter 11 is removably provided at any position on the outer periphery of the exposed area, and the setter 11 is detected and electrically connected to a position facing the externally exposed area of the excavation pipe holding/rotating device. A setter detection means such as a limit switch 12 that outputs a detection signal is provided, and the rotational drive means 10 is controlled to rotate in forward and reverse directions by the signal from the setter detection means.
Since it is configured to be connected to the chuck 9, the excavation pipe 15 can inject ultra-high pressure water, ground improvement agent, etc. at any angle range from 0° to 360° by simply rotating it by a maximum of 360°. , excavating a cavity 32, injecting a ground improvement agent into the soil over an arbitrary range of angles, etc., etc. Work that used to be done by a dedicated machine can now be easily performed with one ground modification device 1.

In addition, since the drilling pipe 15 rotates, the nozzle 1
Even with just one 7, it is possible to improve the ground in a fan-shaped area, which has been done with the conventional fan-shaped compaction soil improvement method, and it is possible to work efficiently with a small-capacity pump and corresponding small-scale auxiliary equipment. Become.

Furthermore, since the excavation pipe 15 can only rotate by a maximum of 360 degrees, the flexible tube 2 for discharging muddy water 27 is
5. Flexible tubes 22, 23, etc. for supplying ultra-high pressure water, ground improvement agents, and even compressed air can be connected directly to excavation pipes 15, etc., without using complicated joints such as swivel joints, etc., during use. It becomes possible to connect the tube to the excavation pipe 15 without getting entangled with the excavation pipe 15, and therefore the structure of the ground modification device 1 can be simplified, and a large impact can be applied and only rough handling can be expected. It becomes possible to provide a device that can withstand use at civil engineering sites.

In addition, since the setter 11 is removably provided in a cylindrical externally exposed part, the nozzle swing angle can be set simply by setting the setter at a position corresponding to the angle at which you want the nozzle to swing. Can be completed or changed. Also, just by looking at the setting position of the setter, you can determine the nozzle swing angle α as shown in Figure 2.
can be visually recognized, and the workability is good.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the ground modification device according to the present invention, FIG. 2 is a plan view showing an example of the excavation pipe holding and rotation device, and FIG. 3 is the ground modification device 1 shown in FIG. 1. FIG. 4 is a front view showing a case where ground improvement is carried out by the columnar consolidation ground improvement method using the same method, and FIG. 4 is a plan view showing another example of the excavation pipe holding and rotation device. 1... Ground modification device, 3... Guide means (leader),
6...Drilling pipe holding and rotation device, 9...Chuck, 10...
Rotation drive means, 11... Setter, 12... Setter detection means (limit switch), 15... Excavation pipe.

Claims (1)

[Scope of Claims] 1. An excavation pipe holding and rotating device is supported by a guide means so as to be movable in the vertical direction, and a chuck is provided on the excavation pipe holding and rotating device so as to be freely rotatable in forward and reverse directions, and further, the excavation pipe is attached to the chuck. is provided in a cylindrical externally exposed portion that rotates together with the chuck of the excavation pipe holding and rotating device, and one or more setters are removably provided at any position on the outer periphery of the exposed portion; A setter detection means for detecting the setter and outputting an electrical detection signal is provided at a position opposite to the externally exposed portion of the excavation pipe holding and rotation device, and the signal from the setter detecting means is used to control the forward and reverse directions. A ground modification device comprising a rotary drive means that is rotationally controlled by the chuck and connected to the chuck.