JPS60203726A - Ground improving device - Google Patents

Abstract

PURPOSE:To enable execution of various ground improving methods, by a method wherein an excavation pipe holding rotary device is movably supported, a chuck is rotatably provided, and a rotary angle setting means for an excavation pipe is mounted. CONSTITUTION:An excavation pipe holding rotary device 6 is lifted along a leader 3 by means of a wire 7, and with a rotary driving means 10 driven, a chuk 9 is turned. A bit 16 is moved downward, and a pilot hole 26, serving as the locus of the bit 16, ie excavated in earth. A cylindrical cavity 32 is formed in a ground by means of ultra-high pressure water 29, and a ground improving agent is injected by a high pressure through a nozzle 17 to fill the cavity 32 with the ground improving agent to build a solid artificial ground. This enables improvement of a ground through a single ground improving device, which is sufficiently durable even against a violent handling manner.

Description

Detailed Description of the Invention (a) 9 Technical Field of the Invention The present invention involves drilling a pilot hole in the ground and then squirting a ground improvement agent such as cement milk to modify and strengthen the ground around the pilot hole. , a ground improvement method called columnar compacted ground improvement method, fan-shaped compacted ground improvement method, plate-shaped compacted ground improvement method, etc. After drilling a pilot hole, high-pressure water is injected horizontally into the ground. The present invention relates to a ground remodeling device suitable for application to a ground remodeling method in which a cylindrical cavity is formed in the ground, and concrete or the like is poured into the formed cavity to form a new ground.

(b), Background of the technology When constructing seawalls or structures, construction of water-stop walls and artificial ground is often carried out. Ground improvement and remodeling work is carried out by injecting improving agents and forming artificial concrete foundations in the soil.

Generally, when constructing water-stop walls, etc., a construction method is used in which the soil improvement agent is pulled up through a pilot hole without rotating the nozzle (this construction method uses multiple nozzles, so it improves the ground in a fan shape). The fan-shaped compacted ground improvement method, which uses one nozzle, and is therefore classified as the plate-shaped compacted ground improvement method, which improves the ground in a plate shape, is used to construct artificial ground, etc. In this case,
A construction method is used in which ultra-high pressure water and high-pressure ground improvement agent are jetted out while rotating a nozzle.

(C), Conventional technology and problems Conventionally, the ground modification equipment used for the lifting method with a fixed nozzle and the equipment that performs ground modification by rotating the nozzle, although they perform similar operations. , which are completely separate and independent devices, resulting in a lot of material and economic waste.

In addition, as the number of nozzles for spraying soil improvement agents increases, the number of incidental equipment such as pumps also increases proportionally. The improved construction method has the disadvantage that the equipment required is larger than that of the plate-shaped compacted ground improvement construction method, which simply sprays water from a single nozzle.

Furthermore, when performing ground modification by rotating the nozzle, in order to prevent the high-pressure tube from becoming entangled due to the rotation of the nozzle, the joint part between the rotating nozzle and the high-pressure tube that supplies high-pressure water, etc. to the nozzle part. A swivel joint is provided. However, in India, the ones that can withstand hundreds of atmospheres of high-pressure water jetting pressure not only have a precise structure, but are also extremely expensive, subject to great shock, and must be handled roughly. There are many practical problems in civil engineering sites where expectations are low.

(d) 0 Purpose of the Invention In order to eliminate the above-mentioned drawbacks, the present invention aims to solve various types of soil problems 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 primary objective is to provide a ground modification device that can implement improved construction methods, and furthermore, it is a ground modification system with a simple configuration that requires only small-scale incidental equipment and does not require a swivel joint. A second purpose is to provide an apparatus.

(e) Configuration of invention 0, that is, invention C, an excavation pipe holding and rotation device having a rotational drive means is supported by a guide means so as to be movable in the vertical direction, and a chuck is attached to the excavation pipe holding and rotation device by the rotation drive. The excavation pipe is provided on the chuck so that it can be freely gripped and released, and the excavation pipe holding and rotation device is provided with means for setting the rotation angle of the excavation pipe.

(Margin below) (f) 0 Examples of the invention Examples of the present invention will be described below based on the drawings. will be explained in detail.

FIG. 1 is a front view showing an embodiment of the soil 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 soil modification bag M1 shown in FIG. 1. FIG. 4 is a front view showing a case in which ground improvement is carried out using the columnar consolidation ground improvement method, and FIG. 4 is a plan view showing another example of the excavation pipe holding and rotating 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 an excavation pipe holding and rotating device 6 that engages with a guide groove 6a formed on the left side of the excavation pipe holding and rotating device 6 in the figure. Ori,
One end of a wire 7, the other end of which is wound around a winch (not shown), is connected to the moat 1111 tube holding and rotating device 6.

Therefore, by driving the wire 7 in the forward and reverse directions to feed out or retract the wire 7, the excavation pipe holding rotation device 6 moves in the vertical direction along the guide rail 3ai of the leader 3.
That is, it can move freely in the directions of arrows C and D.

The excavation pipe holding and rotation device 6 is provided with a chuck 9 rotatably driven in the direction of the arrow A1B by a rotary drive means 10 such as a motor built in the excavation pipe holding and rotation device 6. 2 setters 1
1.11 is removably provided at any position on the outer periphery of the chuck 9 with a screw or the like. Therefore, by attaching the setter 11 to an appropriate position on the outer periphery of the chuck 9, it is possible to arbitrarily set the setting angle a between the setters 11 and 11 within the range of 0° to 3600°. In addition, a limit switch 12 is provided on the excavation pipe holding and rotating device 6, and a setter 11 is connected to the limit switch 12.
The rotation drive means 10 in the excavation pipe holding and rotation device 6 is rotatably driven in the forward and reverse directions by the ON/OFF signal of the limit switch 12.

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 connecting flanges 13aS13a are formed at both upper and lower ends of the rod 13. of the rod 13, the first
At the bottom of the figure, a plurality of rods 13 are connected in series via flanges 13a by fastening means such as bolts, and by this flange connection, the excavation pipe 15 is
Even if the rod rotates forward and backward in the directions of arrows A and B, each rod 13rrI
There is no possibility that the I connection will become loose as would occur with a screw connection.

The lower end of the excavation pipe 15 forms an open port 15a open to the outside, and a drilling bit 16 is attached to the lower end. Also, slightly above the bit 16 is a nozzle 17.
and an ultrasonic ranging sensor 19 are provided, and the nozzle 1
A high pressure liquid supply pipe 20 and a compressed air supply pipe 21 are connected to 7tζ. The high-pressure liquid supply pipe 20 and the compressed air supply pipe 21 are installed to extend in the axial direction of the excavation pipe 15, that is, upward in the figure, along the outer circumference of the excavation pipe 15, and their tips are used to hold the excavation pipe. It reaches the lower part of the rotating device 6, where it is connected to flexible tubes 21, 23 having flexibility. On the other hand, a similarly flexible flexible tube 25 is connected to the upper end of the wB osteotomy 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 with the excavation pipe holding rotation value M6 is As shown in Figure 4, leave only one piece and remove the other one, and in that state pull up the excavation pipe holding rotation device 6 using the wire 7 in the direction of arrow C along the guide rail 3a of the leader 3, and then remove the excavation pipe. The rotation drive means 10 in the holding and rotation device 6 is driven to rotate the chuck 9, for example, in the A direction. When the chuck 9 rotates, the drilling pipe 15 gripped by the chuck 9 also rotates in the direction A, and the bit 16 at the tip of the drilling pipe 15 is moved downward in FIG. 1 by the weight of the drilling pipe holding rotation device 6 and the drilling pipe 150. Start digging. As the drilling pipe holding rotation device 6 moves in the D direction along the leader 3 and the drilling pipe 15 and therefore the bit 16 move downward, a pilot hole 26 is drilled in the soil in the C and D directions as the trajectory of the bit 16. It is formed. The pilot hole 26 is supplied with muddy water 27 to prevent the pilot hole 26 from collapsing due to its hydrostatic pressure, and the muddy water 27 in the pilot hole 26 is pumped through the flexible tube 25 by a suction pump (not shown) to remove the excavated earth and sand generated by the bit 16. Together with the slurry, the slurry is sucked up and discharged from the S front pipe opening 15a through each rod 13 inside the excavation pipe 15 to the outside of the pilot hole 26. The discharged muddy water 27 is returned to the pilot hole 26 after separating the suctioned earth and sand, and is continuously used for excavation.

During excavation, the chuck 9 that rotationally drives the excavation pipe 15 rotates through a maximum of 360 degrees, and the actuator 11 comes into contact with the limit switch 12, thereby activating 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 direction A, rotates in the reverse direction and now rotates the excavation pipe 15 in the direction B.
Rotate the °.

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 rotationally driven in the A direction. That is, the excavation pipe 15 continues to excavate while repeating forward and reverse rotations within an angular range of 360 degrees, but since the excavation pipe 15 never rotates more than 3600 degrees, the excavation pipe 15
The muddy water 27 is discharged from the flexible tube 25 fixedly connected to the upper part via the flange 1' 3a.
This is done smoothly without causing extreme twisting to the flexible tube 25.

In this way, when the pilot hole 26 is drilled to a certain depth and the excavation tube holding/rotating device 6 reaches below the leader 3, the driving of the rotary drive means 10 is stopped to stop the excavation operation, and the chuck 9 is In principle, stop holding the pipe 15, remove the flexible tube 25 at the upper end of the excavation pipe 15, and connect the rod 13 to the new tube.

Therefore, only the excavation pipe holding and rotating device 6 is fixed to the leader 3 and pulled up in the C direction, and the newly connected rod 13 is
Grasp the t-principle tube 15 through the section.

Next, the flexible tube 25 is fixedly connected to the upper end of the newly connected rod 13, and in this state, the rotation drive means 10 of the excavation pipe holding and rotation device 6 is driven again to start drilling the pilot hole 26. In this way, the pilot hole 26
is gradually formed in the D direction, and when the depth reaches DP, the bit 16 stops digging and the front tube holding and rotating device 6 is pulled up along with the excavation tube 15 by Ll. Therefore, this time, ultra-high pressure water 29 is supplied from the flexible tube 22, and compressed air 3 is supplied from the flexible tube 23.
0 is supplied 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 rotation 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 as described above, ultra-high pressure water is generated in the ground 31. 29, a cylindrical cavity 32 is formed.

In the case of B, since the excavation pipe 15 rotates only within an angular range of 360°, the connection state between the high pressure liquid supply pipe 20 and the compressed air supply pipe 21 fixed to the excavation pipe 15 and each flexible tube 22 and '23 is The tubes are well maintained without tangles, and the ultra-high pressure water 29,
The supply of compressed air 30 is carried out smoothly, and therefore the cavity 3
Formation of No. 2 is also carried out without any hindrance. The shape of the cavity 32 during excavation is determined by transmitting ultrasonic waves 33 from the ultrasonic ranging sensor 19 to the cavity wall surface 32a and capturing the reflected waves.
By measuring the distance from the ultrasonic distance measuring sensor 19 to the wall surface 32a, it is possible to accurately grasp the distance.

In this way, when the cavity 32 of a predetermined size is formed in the ground i31, the first bent pipe 15 is
While rotating the nozzle 17 and pulling it up from the lower part of the cavity 32 in the direction C, supply a ground improvement agent such as cement from the flexible tube 22 to the nozzle 17, and inject the soil improvement agent from the nozzle 17 into the cavity 32 at high pressure. The inside of the cavity 32 is not filled with ground improvement agent (in addition, the excavated pipe 15
is used as a tremie tube, and the cavity 32 is inserted through the opening 15a.
Also, a ground improvement agent such as concrete may be filled into the pilot j.26. ). When the ground improvement agent is filled into the cavity 32 and the pilot hole 26 and the excavation pipe 15 is pulled up in the direction C, the filled improvement agent solidifies and forms the ground 31.
A strong artificial ground will be built inside.

Once the artificial ground has been constructed at one location, move the mobile Shigatsuki 2, create a new pilot hole 26 in a position adjacent to the constructed artificial ground, and construct the cavity 32. Furthermore, the artificial ground is expanded by filling the ground improvement agent and connecting the cavity 32 with the previously IM-constructed cavity 32 (which has already been filled and solidified with the soil improvement agent).

In addition, in the above-mentioned embodiment, the ground modification device 1 according to the present invention has a cavity 32 in the ground 31. Although we have described an example in which an artificial ground is formed by pouring a ground improvement agent after cutting, the ground modification device 1 according to the present invention is not limited to such a construction method. After excavating the hole 26, immediately apply the ground improvement agent 35 into the ground using the nozzle 17 without excavating the cavity 32.
With high pressure, the nozzle 17 is
Similarly, a cylindrical improved ground 36 is formed using earth and sand as aggregate by ejecting it while rotating and raising it.
It can also be used in the so-called columnar solidified ground improvement method (this is a major factor).

Furthermore, if the two setters 11 of the chuck 9 of the excavation pipe holding and rotation device 6 are set at a set angle α as shown in FIG. Since the rotation driving means 10 for rotationally driving the chuck 9 rotates in the reverse direction, the chuck 9 and therefore the master tube 15 can be swung within the range of the set angle α. This means that the soil conditioner can be injected into the soil from the pilot hole 26 within the angle a,
-/By swinging the glue at an angle a and pulling it upwards, it becomes possible to carry out the so-called fan-shaped compacted ground improvement method. In addition, if the rotary drive means] 0 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, it is possible to form a so-called plate shape. It also becomes possible to use the consolidated ground improvement method.

Note that the rotation angle setting means of the cut pipe] 5, such as the limiter 1-switch 12 and setter 11, sets the rotation angle of the cut pipe 15 in the range of 00 to 360 degrees (as long as 7 is obtained, any j11 'j configuration may be used, and is not limited to a contact type like the one in this example, but a non-contact type using magnetism, etc.
I can think about various things.

Furthermore, the guide means such as the leader 3 that supports and guides the excavation pipe holding and rotating device 6 does not necessarily have to be attached to the mobile heavy equipment 2, etc., but if the mobile heavy equipment 2 is provided with the guide means, a large number of It becomes possible to drill the pilot hole 26 efficiently.

(g) 0 Effects of the Invention As explained above, according to the present invention, the excavation pipe holding and rotation device 6 having the rotation drive means 10 is supported movably in the vertical direction on the guide means such as the league 3, and A chuck 9 is provided on the excavation pipe holding/rotating device 6 so as to be rotatably driven in forward and reverse directions by the rotation drive means 10, and a bent pipe 15 is further provided on the chuck 9 so as to be able to be gripped and released. Since a rotation angle setting means for the III drilling pipe 15 such as a setter 11 and a limit switch 12 is provided, the drilling pipe 15 can rotate up to 360° and
It is possible to inject ultra-high pressure water, soil improvement agent, etc. at any angle range from 360° to 360 degrees, and it is possible to perform operations such as excavating a cavity 32 and injecting soil improvement agent into the soil over any angle range. The work that used to be done by dedicated machines such as the columnar compacted ground improvement method, the fan-shaped compacted ground improvement method, and the plate-shaped compacted ground improvement method can now be easily performed with a single ground modification device 1. Become.

In addition, since the fail cutting tube 15 rotates, the nozzle 17
Even with just one, it is possible to improve the ground in a fan-shaped area, which has been done using 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. .

Furthermore, since the excavation pipe 15 rotates only 360 degrees at maximum, the flexible tube 25 for discharging muddy water 27, the flexible tube 22, 23 for supplying ultra-high pressure water, ground improvement agent, and compressed air supply, etc. ta directly without using complicated joints such as swivel joints.
It becomes possible to connect these tubes to the detonator 15 without getting entangled with the excavation pipe 15 during use, and therefore, the structure of the ground modification device 1 can be simplified and a large impact is not applied. Moreover, it is possible to provide a device that can withstand use at civil engineering sites where only rough handling can be expected.

[Brief explanation of the drawing]

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 in which ground improvement is carried out using the columnar consolidation ground improvement method, and FIG. 4 is a plan view showing another example of the excavation pipe holding and rotating device. 1... Ground modification device 3... Guide means (league) 6... Excavation pipe holding rotation device 9... Chuck 10... Rotation drive means 11... Rotation angle setting means (setter) 12...
... Rotation angle setting means (limit switch) 15 ... Excavation pipe applicant Mitsui Construction Co., Ltd. N.I.T. Co., Ltd. agent Patent attorney Phase 1) Okiji May 14, 1982 1 Display of the case 1982 Patent Application No. 19018 2 Title of the invention Ground modification device 3 Person making the amendment Relationship to the case Patent applicant address 3-10-1 Iwamoto-cho, Chiyoda-ku, Tokyo Name (name) Mitsui Construction Co., Ltd. Company Representative Ryoji Machida Address: 1752 Zushicho, Machida City, Tokyo Name (Name)
Nissan Freeze Co., Ltd. Representative: Moto Hiroshi Goto Address: 301 Takamine Building, 3-4-2 Nakamachi, Machida City, Tokyo
Name Name NIT Co., Ltd. Representative Wataru Nakanishi 4 Agent Address 3-12-21 Shimoai, Shinjuku-ku, Tokyo 161
Sonobe Pill No. 504 Phone: 03 (950) 322
0 (1) Power of attorney (2) Full statement 7, ? 711 Fill out the correct contents + I + attached power of attorney.

Claims (1)

[Scope of Claims] An excavation pipe holding/rotating device having a rotational driving means is supported by a guide means so as to be movable in the vertical direction, and a chuck is rotatably driven on the excavating pipe holding/rotating device in forward and reverse directions by the rotational driving means. A ground remodeling device comprising: the excavation pipe being provided on the chuck so that the excavation pipe can be freely gripped and released; and the excavation pipe holding and rotating device being provided with means for setting the rotation angle of the excavation pipe.