JPS5835705Y2 - Solidification equipment for soft soil layers - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for solidifying soft soil layers such as weathered clay layers, mud layers, and soft soil layers such as sludge.

In Japan, a country with a small land area and limited resources, it is important to actively promote the development of marine resources and the effective use of marine space.

On the other hand, most of the cities in Japan's coastal regions are located on soft alluvial soil, and it is often the case that most of the construction costs for port facility construction are spent on improving the foundation ground.

Due to these circumstances, many conventional construction sites have adopted methods such as replacement construction methods, sand drain construction methods, and compacted sand pile construction methods.

However, in recent years, from the viewpoint of preserving the natural environment and preventing pollution, it has become difficult to process the soft soil that has been dug up and to collect and supply high-quality sand for landfill.

Conventionally, this type of device has been proposed in Japanese Utility Model Application Publication No. 51-71605.

That is, in FIG. 13, while excavating the ground with the digging blade 101 provided at the lower end of the hollow shaft 100, the caking agent is supplied from the nozzle hole 102, and the mixing blade 103 is
The soil is stirred and kneaded to improve the hardening of the ground.

However, in the above configuration, since the nozzle hole 102 is located below the kneading blade 103, in order for the caking agent supplied from the nozzle hole 102 to be kneaded by the kneading blade 103, it is necessary to It is limited to the process,
In the ascending process after excavation, even if the caking agent is supplied from the nozzle hole 102, it is not stirred and mixed by the mixing blade 103, so there is a drawback that the efficiency of solidifying the ground is low.

In addition, in order to sufficiently stir and mix the soil layer excavated by the above device and the caking agent, adjacent mixing blades 103 are crossed with each other as shown in FIG.
As shown in FIG. 15, the kneading blades 103 are arranged alternately in the axial direction 105 of the hollow shaft 100.

Therefore, the blade 103a in FIG.
The soft soil containing the solidifying agent that has been pushed out in the direction of the blade 103b does not move until the hollow shaft 100 moves in the axial direction
The soft soil that is stirred and mixed by the blades 103b and further pushed out by the blade 103b moves in the direction of the arrow 106.

Therefore, the soft soil is moving as shown by the broken line in relation to the positional relationship with the cross-conductor blade 103, but since the cross-conductor blade 103 is also moving in the axial direction 105, the soft soil is moving slightly at the same location in relation to the ground. Because they only move in the left-right direction, and their rotations are not synchronized, the vertical arrangement span of adjacent mixing blades must take into account the deflection of the shaft and the bending of the blades under load. The value must be large, and the intersection range of the trajectories of the blades is similarly narrow, which has the disadvantage that stirring and mixing cannot be performed sufficiently.

Further, the nozzle hole 102 is provided above the excavation blade 101, and the liquid supplied from the nozzle hole 102 does not serve as a lubricant to the excavation blade 101.
It has the disadvantage that it is easily worn out and the driving torque is large when excavating hard ground.

In addition, the unimproved layer remains between the nozzle hole and the excavation blade, and the improved layer does not adhere completely to the supporting ground.

In view of these circumstances, this idea was developed to solidify the soft soil layer itself by injecting a softening agent such as cement emulsion to prevent pollution and make effective use of the soft soil layer, while also improving the solidification efficiency of the soil. The purpose of the present invention is to provide a device for solidifying soft soil layers that can be improved.

Embodiments of this invention will be described below with reference to the drawings.

Figure 1 shows an example of the solidification work of soft soil layer a on the seabed. The soft soil layer solidification device A is suspended by a wire rope D from the Yagura C of the work boat B so that it can be raised and lowered, and is mounted on the tower on the work boat B. A hardener liquid, such as cement emulsion, is supplied from E through hose F.

The soft upper layer solidification device A has a hydraulic motor 2 and a reduction gear mechanism 3 set on a base 1 as shown in FIG.
On this base 1, there are l pairs of support main pipes 4a.

4b is suspended, and four rotating shafts 6a, 6b are rotatably supported around the circumference by bearings 5, as shown in the enlarged cross-sectional view in FIG. The upper ends of each rotating shaft 6 a and 6 b are set at equal intervals in FIGS. 4 and 5.
As shown in the figure, it is connected to an output shaft 8 of the reduction gear mechanism 3 via a universal joint 7.

As shown in FIG. 6, a plurality of stirring blades 9 al, 9 a2, 9 bl, 9 b2 are fixed to the lower end of each of the rotating shafts 6 a, 6 b in upper and lower two stages, and the rotation area of the adjacent stirring blades is are arranged so as to intersect as shown in FIG.

Further, as shown in FIG. 6, the stirring blades 9 al and 9 a2 provided on the rotating shafts 6 a and 6 b of the same support main pipe, for example, the support main pipe 4 a, are connected to adjacent comrades 9
At and 9at and 9a2 and 9a2 are provided so as to intersect within the same plane.

Reference numerals 10a and 10b are excavating blades having approximately the same diameter as the agitating blades 9a1 to 9a2 fixed to the lower ends of the nobos portions 11 of the agitating blades 9a1 to 9b2. 8 As shown in Figure 1, first curing agent liquid injection pipe 1
Three spouts 14 are set.

This piping 13 passes through each rotating shaft 6a, 6b, and passes through an external piping 16 via swivel joints 15a, 15b (see Fig. 5) provided at its upper end to a large number of pipes set upward. It is connected to a predetermined pipe 70 among the pipes.

In addition, a pair of second curing agent liquid injection pipes 17a, 17b are arranged parallel to each of the main pillar pipes 4a, 4b, and are guided around the outer periphery of each of the main pipes 4a, 4b. It is supported by a piece 18 so as to be able to rise and fall, and an opening/closing lid 20 as shown in FIG. 9 is fitted around the spout 19 at the lower end, and a spring 2 biases the opening/closing lid 20 in the direction of closing the spout 19.
1 is set on the outer periphery of the pipes 17a and 17b, and the opening/closing lid 20 is guided to open and close stably by a guide rod 23 fitted into a spring washer 22.

The second curing agent liquid injection pipes 17a, 17b have slide rings 24a, 24 slidably fitted onto the main support pipes 4a, 4b at their upper ends, as shown in FIG.
b, and these two slide rings 24a, 2
4b are connected by a bracket 25.

A W-shaped locking link 27 supported by a pair of pivots 26 is attached to the connecting bracket 25 so as to be expandable and retractable, and the locking portions 27 a and 27 b at both ends of the link 27 are connected to the main column 4 a , Projections 28a, 28 on the outer periphery of 4b
b to lock and hold the pipes 17 a and 17 b in the raised position.

By pressing the center portion of this W-shaped locking link 27 downward with the piston rod 30 of the hydraulic cylinder 29, the lock is released as shown by the imaginary line in FIG.

This unlocking can be electrically confirmed by the proximity body 32 fixed to the detection rod 31 moving integrally with the piston rod 30 changing from the proximity switch 33 to the proximity switch 34.

Further, the connecting bracket 25 is suspended by a hydraulic cylinder 35 on the lower surface of the base 1, and after the lock is released, this cylinder 3
5 and extend the slide ring 24a.

24b and the second curing agent injection pipe 17a, 1
7 Lower b.

When these pipings 17a and 17b descend, the stirring blades 9al, 9a2, 9bl, and 9b2 should be selected at stopping positions where they do not hit the pipings 17a and 17b, as shown in Fig. 7. Of course, each of the four rotating shafts 6 a and 6 b are mechanically connected by the reduction gear mechanism 3, so if the stopping position of each rotating shaft is selected, all the The stirring blades are arranged as shown in FIG. 7, which allows the pipes 17a and 17b to be lowered without hitting the stirring blades.

The reduction gear mechanism 3 includes stirring blades 9at located in the same plane.
The agitating blades 9a2, 9bl, and 9b2 also rotate the rotating shafts 6a and 6b synchronously so that they do not come into contact with each other.

Next, the operation of the above configuration will be explained.

As shown in Figure 1, the soft upper layer solidification device A is suspended from the work boat B, which is fixed in place with the wire rope G, by unwinding the wire rope D by operating the winch H, and is buried in the soft soil layer a. let them in.

In the case of an extremely soft soil layer such as a sludge layer, the solidification device A can be buried in the layer by its own weight.

On the other hand, in the case of soil layers such as a slightly hard weathered soil layer or mud layer C, the hydraulic motor 2 shown in FIG. The excavating blades 10a and 10b fixed to the lower ends of the excavating blades 10a and 10b are rotated, and the blade 12 excavates while spouting water from the spout 14 of the piping 13 shown in FIG.

When the predetermined length of excavation is completed, the driving of the hydraulic motor 2 is stopped, the stirring blades 9a1 to 9b2 are stopped in the state shown in FIG. 7, and the second pipes 17a and 17b are moved from the solid line position in FIG. Lower it to the virtual line position.

In this downward stroke, the second pipes 17a, 17
Since the spout 19 of b is closed with the opening/closing lid 20, the soft top does not enter into the pipes 17a and 17b.

At this lowered position, when a hardening agent liquid such as cement emulsion is pumped into the pipes 17a and 17b, the opening/closing lid 20, which was blocking the spout 19 shown in FIG. The curing agent liquid is thereby poured out from the spout 19.

While pouring out the hardening agent liquid, the pipe 17a,
17b is sequentially moved upward, and at this time, the curing agent liquid is also jetted from the first piping spout 14 shown in FIG. 8, and the hardening agent liquid is again held at the position shown by the solid line in FIG. 6.

After that, if the rotating shafts 6 a and 6 b are driven to rotate,
Stirring blades 9a1 to 9b2 and excavation blades 10a, 10
At b, the hardening agent liquid and the soft top are homogeneously stirred and mixed, and mixing at the bottom e of the hardening agent mixed soil column d (see FIG. 1) is achieved reliably.

Once the mixing of the bottom e is achieved, the soft upper layer solidification device A
The first
．． Second piping 13, 17a, 17b spout 1
The hardening agent liquid is poured out from step 4.19, and the soft soil into which the hardening agent liquid has been poured is stirred by stirring blades 9at to 9a2 to form a hardening agent liquid mixed soil pillar d.

In addition, in the case of forming a continuous wall, after the soil pillars d are formed at a predetermined interval, if a soil pillar (not shown) is similarly inserted between each of the soil pillars 6, a continuous hardened wall can be formed. A soil column containing a chemical solution mixture is formed.

As shown in FIG. 1, the hanging of the apparatus A is carried out stably and smoothly by the guidance of the fixed guide body (3) and the movable guide body suspended by the wire rope J.

In addition, as shown in Fig. 3, the main pillars 4 a and 4 b
It is recommended that they be connected at least at their lower portions by a frame body 31 consisting of a bracket with a vertical plane.It goes without saying that this reduces the frictional resistance during excavation and also reduces the accumulation of soil layers. 2 is a drive hydraulic system diagram of the hydraulic motors 2, which shows the drive hydraulic system of the four hydraulic motors 2 for rotationally driving the four rotating shafts 6a mounted on the main column 4a in FIG.

In the figure, 40 is an oil tank, 41 is a pressure pump, 42.4
3.

44 is a switching valve, 45 a and 45 b are check valves, 46 is a flow rate regulating valve, 47 is a pressure reducing valve, and 48 is a pressure regulating valve.

Now, the switching valves 42, 43. are in the state shown in FIG.
44 is set, the pressure oil a' pressurized by the pressure pump 41 flows through the pipes 49, 50, 51, 52 and 53, 54 .
After passing through 55 and flowing into the four hydraulic motors 2 (2□ to 24) and driving all these hydraulic motors 2 to rotate,
Oil b' is recycled to oil tank 40 through lines 56, 57, 58 and 59.

Further, the drain oil C' from the hydraulic motor 2 is supplied to the pipe line 60,
61 and is returned to the oil tank 40.

Next, when the switching valves 43 and 44 are set as shown in FIG. is shut off, and pressure oil a' is supplied to the two right hydraulic motors 23, 2. Supplied only to

In this case, a trace amount of pressure oil is supplied to the hydraulic motors 2□, 22 through the check valve 45a, the pipe line 62, the flow rate adjustment valve 46, the pressure reducing valve 47, the check valve 45b, and the pipe lines 63, 51, 52. d' is replenished, and its waste oil e' is circulated through the pipe 56, the switching valve 43, and the pipe 50°51.52 to the hydraulic motors 20, 2□,
A portion e'' is returned to the oil tank 40 through the switching valve 44, the pressure regulating valve 48, and the pipes 64 and 61.

As shown in Fig. 11, when pressure oil a' is simultaneously supplied to the four hydraulic motors 2, - 24 under a constant pump discharge pressure, the driving torque increases and the rotation speed shown in Fig. 2 increases. It is possible to increase the rotational driving force of the shaft 6a (6b) and improve the ability to dig into soft soil layers.

On the other hand, as shown in FIG. 12, two hydraulic motors 23
, 24, the driving torque of each shaft decreases, but the rotational speed can be increased, thereby improving the stirring efficiency.

Incidentally, in the reduction gear mechanism 3, in order to prevent mutual interference between the stirring blades and the excavation blades, the rotational states of all the rotating shafts 6a and 6b are synchronized by gears within the reduction gear mechanism 3, so that the hydraulic motor 2 The number of rotating shafts 6 a and 6 b does not necessarily have to match as in the above embodiment.

In addition, since the stirring blades 9 are set to rotate synchronously with each other, adjacent stirring blades 9 can be disposed on the same plane, although they intersect with each other. Stirring and mixing is performed.

Further, in the above configuration, during the downward stroke during excavation, the hardening agent liquid is supplied from the first hardening agent injection pipe 13 provided on the excavation blade 9, and during the upward stroke, the hardening agent liquid is supplied from the second hardening agent injection pipe 17. By positioning the spout 19 on the stirring blade 9, the curing agent can be supplied from the injection pipe 17 to the already excavated soft soil layer.

Therefore, in one excavation process, the hardening agent can be injected twice in the descending process and the ascending process.
It is possible to reliably improve the solidified soil layer.

Further, the spout 14 of the first hardening agent injection pipe 13 is connected to the blade body 1.
2, the water and hardening agent liquid poured out from this acts as a lubricant for the blade body 12, and the blade body 12
wear and drive torque can be reduced.

Furthermore, since there is no vertical separation between the spout 14 and the excavation blade 9, the improved layer can be brought into complete contact with the support layer.

As is clear from the above, this idea solidifies the soft soil layer itself by injecting a hardening agent liquid such as cement emulsion, so it is possible to prevent pollution and make effective use of the soft soil layer. Furthermore, it has excellent advantages such as solidification of soft soil layers can be performed firmly and efficiently down to the bottom.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an example of a soft soil layer solidification device according to this invention, Fig. 2 is a schematic front view showing an example of a soft soil layer solidification device, and Fig. 3 is an enlarged view taken along the line III-III of Fig. 2. 4 is an enlarged front view of the top end of the soft soil layer solidification device, FIG. 5 is an enlarged side view of the top end of the device, FIG. 6 is an enlarged front view of the flat end of the device, and FIG. The figure is Vll-Vll in Figure 6.
FIG. 8 is a partially cutaway plan view of the stirring blade, FIG. 9 is a cross-sectional view of the spout of the second curing agent injection pipe, and FIG. 10 is a schematic plan view taken along a line. Fig. 4 is a front view for explaining the operation of the main parts, Fig. 11 is a drive hydraulic system diagram of the hydraulic motor, Fig. 12 is the same system diagram for explaining the operation, Fig. 13 is a side view showing the conventional example, Figure 14 is a plan view showing the operation of the conventional example;
FIG. 15 is a side view showing the operation of the conventional example. DESCRIPTION OF SYMBOLS 1... Base, 2 (21-24)... Hydraulic motor, 3... Reduction gear mechanism, 4 a, 4
b... Main pillar, 6 a, 6 b...
...Rotating shaft, 9a1-9b2... Stirring blade, 10
a, 10 b...Drilling wing, 11...
- Stirring blade boss part, 12...Blade body, 13...
...First curing agent liquid injection pipe, 14.19... Outlet, 17a. 17 b...Second curing agent liquid injection pipe, 41...
... Pressure pump, 43 ... Switching valve, 51.
52, 54.55...Parallel piping, 46...
...Flow rate adjustment valve, 47...Pressure reducing valve, 62.63
・・・・・・Supply pipeline.

Claims (2)

[Scope of utility model registration request] (1) A movable base, a plurality of support main pipes suspended in parallel to this base, and a plurality of support main pipes rotatably supported along the outer periphery of each support main pipe. A rotating shaft of a book, a plurality of stirring blades fixed to the lower end of each rotating shaft so that adjacent ones thereof intersect in the same plane, and the stirring blade fixed to the lower end of the boss part of these stirring blades. An excavation blade having approximately the same diameter as , a first hardening agent injection pipe passing through the rotating shaft and having an outlet on the excavation blade, and the adjacent stirring blade set on the base do not come into contact with each other. A plurality of hydraulic motors are driven to rotate through a reduction gear mechanism that synchronously rotates the rotary shafts, and the spout is lowered to below the stirring blade when it is in a stopped state. A device for solidifying a soft soil layer, comprising: a second hardening agent injection pipe supported so as to be raised and lowered in a direction parallel to the main support pipe so as to be raised and lowered. (2) Multiple hydraulic motors are connected to a pressurizing pump by parallel piping, and a switching valve is installed in a part of the piping to supply pressure oil to only a predetermined number of the hydraulic motors. A method for solidifying a soft soil layer as set forth in claim 1, wherein a hydraulic motor to which pressure oil is not supplied is provided with a conduit for supplying a small amount of pressure oil through a pressure regulating valve and a flow rate regulating valve. Device.