JPH0941360A - Soil improving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To agitate and mix soil and sand in a scraping region circle uniformly without exception by synchronously turning and driving each excavating lever so that two agitating blades are not brought into contact and do not interfere. SOLUTION: A ground excavator 20 is lowered on a ground surface along a guide rail 16B and excavating levers 22 are turned and driven, the excavating levers 22 are buried gradually into the ground and the bites 26a, 28a of excavating blades 26 and excavating blades 28 at the front ends of lower sections excavate soil and sand, and excavated soil and sand are agitated and mixed by agitating blades 24. A hardener infection device 40 is operated at the same time as the agitation and mixing of soil and sand, and soil and sand are supplied with a hardener from hardener discharge nozzles 50 at front end sections. Accordingly, an improved stabilized improved column body is formed by successively continuing excavation up to specified depth from the ground surface while soil and sand are stirred and mixed as supplying the hardener, and a weak ground is changed into an improved hard ground. Operation is enabled without trouble even by overlapping the scraping circles of the agitating blades 24, 24 of two shafts by controlling revolution so that the rotational speed of both shafts is turned at that time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement device, and more particularly, to a stable improved ground by constructing a columnar improved body having a required strength by uniformly stirring and mixing a solidifying material inside a soft ground. The present invention relates to a ground improvement device for creating a ground.

[0002]

2. Description of the Related Art In conventional ground improvement devices, there are two types of excavation and hoisting type, a single-axis type and a multi-axis type. FIG. 5 shows an example of a ground improvement apparatus having one excavation blade, and a drilling blade 6 having a diameter smaller than the diameter of the excavation blade 2 fixed to the tip of the excavation blade 1 is provided at the tip of the excavation blade 1. A co-rotation preventing blade 4 having a larger diameter than this is mounted on the excavating blade 2 in a loosely fitted state, and the stirring blade 3 is further provided thereon.
A jetting port 8 for the solidifying material is provided for fixing a, 3b, and 3c. On the other hand, as shown in FIG. 6, the multi-axis ground improvement device having two excavation hoists has two excavations 1, 1 arranged in parallel with each other at an appropriate interval. Excavating blade 2 rotating with it and stirring blades stirring blades 3a, 3b, 3
c is fixed to the excavator 1 and is provided with co-rotation preventing blades 4 and 5 that connect the excavators 1 and 1 in a loosely fitted state to the excavator 1 and are provided with ejection ports 1a and 1a. Since the multi-axis type has a larger ground excavation area for working at the same time than the single-axis type, the work efficiency is naturally good.

[0003]

However, a multi-axis type ground improvement device is, for example, as shown in FIG.
The diameter and height of the excavating blades and agitating blades in the two excavating blades are exactly the same, and when they are arranged at the same height, the excavating blades and agitating blades are arranged so that they do not interfere with each other. It is necessary to increase both excavation distances so as not to overlap the sweep circles, but in this case, the agitation of the sand in the non-overlapping portions of the sweep circles becomes insufficient. Therefore, as shown in FIG. 8, when the two excavator blades are arranged close to each other so that the sweeping circle of one stirring blade overlaps with the sweeping circle of the other stirring blade, two adjacent adhering blades are placed next to each other. The height of the agitating blades of the excavator and the excavating blades are vertically shifted so that they do not interfere with each other. The height H2 is the height H between the upper and lower stirring blades that does not include the co-rotation prevention blade.
It becomes too large compared with 1 and the stirring action of the soil in this part becomes insufficient.

[0004]

In order to solve such problems, the present invention provides a ground improvement device for soft ground, which forms a columnar improved body in which a solidifying material is uniformly mixed in soft ground. A ground excavating device, a solidified material injecting device, and a traveling device that mounts and moves the ground excavating device. The traveling device is formed of a crawler, and the ground excavating device is vertically installed on the traveling device in a tiltable manner. A pair of left and right excavators that can be moved up and down along the guide rails laid on the column base by the operation of the hoisting machine and the distance between the two shafts can be fixed or variable.
Two or four agitating blades, which are formed at a plurality of stages at equal intervals and project at the same height in the horizontal direction in the radial direction, are provided on the lower sides of both the excavators. The shaft-to-shaft distance between the blades is set so that the respective sweeping circles of the stirring blades projecting from the respective blades overlap so that the stirring blades of the two blades do not come into contact with each other during operation. A horizontal mud co-rotation preventing member having a synchronizing mechanism for controlling the rotation angles of both stirring blades, and both ends of which are loosely fitted to the excavation joint at an intermediate height position between the stirring blades to connect the both excavation joints. Is provided with a rotatable excavating blade having a sharp blade whose tip projects substantially downward at the lowermost portion, and a solidifying material discharge nozzle connected to the solidifying material injection device is provided. The injection device is a solidification material silo and a solidification material for transferring the solidification material. It was provided comprising constituting the amplifier or compressor and the solidifying material supply pipe solidifying material for transportation to be connected to the solidifying agent discharge nozzle.

[0005]

In the present invention, the heights of the stirring blades in each stage are made the same, and the sweeping circles of the adjoining stirring blades are arranged so as to overlap with each other, and the rotation angles of the stirring blades are controlled synchronously. Since a mechanism is provided and each excavation blade is driven to rotate synchronously so that both stirring blades do not interfere with each other, the soil in the area surrounded by the sweeping circle of both stirring blades is evenly distributed at any height. Instead, it is uniformly mixed by stirring.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 relate to an embodiment of the present invention, FIG. 1 is an overall side view of a ground improvement device, FIG. 2 is an enlarged front view of a main part of an excavation and hoisting device, and FIG. 3 is a plan view taken along line AA of FIG. Figure, Figure 4
[Fig. 3] is a front view of a drive device for excavation and fear of a ground excavation device. As shown in FIG. 1, the ground improvement device 100 includes a caterpillar 1
A traveling device 1 including a crawler 10A that can travel by 2
0, a column base 16 which can be tilted on the traveling device 10 by a tilting cylinder 16A, and a guide rail 16 installed along the column base 16.
The ground excavator 20 is composed of an excavator 22 which can be moved up and down by a hoist along B, and a solidifying material injecting device 40 which supplies a solidifying material to a lower end portion of the excavator 22.

The ground excavating device 20 includes two excavators 2
2 and 22 are arranged in parallel, and at the lower end of each excavation blade 22, as shown in FIG. 2, a plurality of cutting tools 26a having sharp blade surfaces are attached to the bottom and the outer periphery of the excavation blade 26. Excavation wing 2 with bite 28a attached diagonally to
An excavation blade 28 having a diameter larger than 6 is horizontally projected, and a plurality of stages of stirring blades (also referred to as stirring blades) 24 are projectingly provided on the upper portion thereof at appropriate intervals. The stirring blades 24 may be in the state of standing a flat plate, or, as shown in FIG. 3, may be formed by two plates extending in a 180 degree direction with the plate being inclined, or in a cross shape. You may form with four sheets. The stirrer blades 24 of each stage are arranged at the same height as the stirrer blades 24 of the adjacent excavation blades 22 and, as shown in FIG. 3, both excavation distances are set so that the sweep circles overlap each other. Select. Then, the rotation directions of the two excavator blades 22, 22 are opposite to each other, and the rotation angle is controlled by a synchronizing mechanism so that adjacent stirring blades 24, 24 of the same height do not come into contact with each other. The distance between the two excavations 22 may be fixed and set to a constant distance such that the sweep circles of the stirring blades 24 overlap, or, for example, a parallelogram link mechanism is used. The distance between the two excavations may be variable by a mechanism or the like. Further, one or a plurality of solidifying material discharge nozzles 50 are provided on the side wall of the lower end portion of the excavator 22 and are connected to a solidifying material supply pipe 48 to be described later so that the solidifying material can be discharged. On the other hand, as shown in FIG. 2, a horizontal mud mud co-rotation preventing member 30 having both ends loosely fitted around the outer circumference of the excavation shelter 22 is spanned between any adjacent upper and lower stirring blades 24, 24. , 22 Connect together.

FIG. 4 shows a drive device for the ground excavation device 20, in which hydraulic motors 36 for rotatably driving the excavation drills 22 are disposed above the excavation drills 22, and the excavation drill 22 is further passed through a synchronizing device 38. Connected to. The synchronizer 38 controls the mutual relation of the rotation angles of the output shafts of the respective hydraulic motors 36 as set arbitrarily. For example, a gear mechanism or a chain wheel mechanism may be used. Electrical means may be used.

As shown in FIG. 1, the solidifying material injecting device 40 includes a solidifying material silo 44 for storing the solidifying material in a vehicle such as a truck 42 and a pump 46 (when the solidifying material is liquid).
Alternatively, a rotary joint 48a mounted with a means for transferring a solidifying material such as a compressor 46A (when the solidifying material is powder) and attached to the upper portion of the drilling mortar 22 via a solidifying material supply pipe 48 formed of a flexible pipe. Through the solidifying material flow path 22a drilled in the direction of the central axis of the excavation drill 22
The solidified material discharge nozzle 50 at the lower end of the solidified material is discharged.

Next, the operation of the present invention constructed as above will be described. First, the crawler 1 of the traveling device 10
After moving and fixing 0A to the work site requiring ground improvement, the column base 16 is erected vertically and then the wire rope 14a is lowered by the hoisting machine 14, and the ground excavating device 20 is guided along the guide rail 16B. The hydraulic motor 36 for driving the excavation hoist 22 of the ground excavation device 20 is rotationally driven while being gently lowered onto the ground. With the progress of this excavation work,
Is gradually buried in the ground and the excavation blade 26 and the excavation blade 2 at the lower end are
The eight cutting tools 26a and 28a excavate the earth and sand around the lower part of the excavation and the excavation and the stirring blade 24 stirs and mixes the excavated earth and sand. During this excavation and mixing, the solidifying material injection device 40 is operated to supply the solidifying material to the earth and sand from the solidifying material discharge nozzle 50 at the tip. In this way, while continuously excavating from the ground surface to a predetermined depth, by stirring and mixing while supplying the solidifying material, an improved and stable improved columnar body is formed, and the soft ground is improved with the hard ground. To do. When the work at one place is completed, the hoisting machine 14 is operated to raise the ground excavation device 20 to the ground, move it to the next work place, and so on. The solidifying material may be dissolved in water and supplied as a liquid such as an aqueous solution, or powder may be supplied by air carrying with air.

As described above, in the present invention, 2
In the shaft ground improvement device, by controlling the rotation so as to synchronize the rotation angles of the two shafts, the stirring blades 2 of both shafts are
Even if the sweeping circles 4 and 24 are overlapped, the work can be carried out without any trouble, so that the excavated earth and sand or mud can be uniformly stirred.

[0012]

As described above, the present invention has the following excellent functions and effects. (1) Since the work can be carried out without any problem even if the sweeping circles of the stirring blades on both shafts are overlapped with each other, the mixing uniformity of the excavated earth and sand and the solidifying material is high, and the degree of improvement of earth and sand is improved. (2) Since the left and right stirring blades can be arranged at the same level without a step difference, the height between adjacent upper and lower stirring blades can be shortened. Therefore, the stirring efficiency is high. In particular, the dead zone between the stirring blades near the mud co-rotating member in the step difference method can be eliminated. (3) Even if the torque applied to the right and left excavations differs due to the difference in geology and the presence of foreign matter, the load of the hydraulic motor for driving each excavation can be equalized by the tuning device.

[Brief description of drawings]

FIG. 1 is an overall side view of a ground improvement device according to an embodiment of the present invention.

FIG. 2 is an enlarged front view of a main part of excavation and puddle of the ground improvement device according to the embodiment of the present invention.

3 is a cross-sectional plan view taken along the line AA of FIG.

FIG. 4 is a front view of a drive device for excavation and pavement of the ground excavation device according to the embodiment of the present invention.

FIG. 5 is a front view of excavation and hoarding of a conventional single-axis type ground improvement device.

FIG. 6 is a front view of excavation and damage of a conventional two-axis type soil improvement device.

FIG. 7 is a front view of excavation and damage of a conventional two-axis parallel type ground improvement device.

FIG. 8 is a front view of excavation and damage of a conventional two-axis stepped type soil improvement device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavator 1a Jet outlet 2 Excavation blades 3a, 3b, 3c Stirring blade 4 Co-rotation prevention blade 5 Co-rotation prevention blade 6 Drilling excavation blade 8 Jet outlet 10 Traveling device 10A Crawler 12 Caterpillar 14 Hoisting machine 14a Wire rope 16 Column base 16A Tilt cylinder 16B Guide rail 20 Ground excavation device 22 Excavation erosion 22a Solidifying material flow path 24 Stirring blade (stirring blade) 26 Excavation blade 26a byte 28 Excavation blade 28a byte 30 Co-rotation prevention member (mud co-rotation prevention member) 36 Hydraulic pressure Motor 38 Synchronous device 40 Solidifying material injecting device 42 Track 44 Solidifying material silo 46 Pump (compressor) 48 Solidifying material supply pipe 48a Rotating joint 50 Solidifying material discharge nozzle 100 Ground improvement device

Claims (1)

[Claims] 1. A ground improvement device for soft ground, which forms a columnar improved body in which a solidifying material is uniformly mixed in soft ground, which is equipped with a ground excavating device, a solidifying material injecting device, and the ground excavating device for moving. The traveling device is formed of a crawler, and the ground excavating device is moved up and down by the operation of a hoist along a guide rail laid on a column base that is tiltably erected on the traveling device. It has a pair of left and right excavators that are freely movable and have a fixed or variable distance between the two shafts. Two or four stirring blades are formed at equal intervals around the circumference, and the sweeping circles of the stirring blades protruding from each of the excavating blades overlap the distance between the two shafts. And set the stirring blades of both excavators to A synchronizing mechanism is provided to control the rotation angles of both stirring blades so that they do not interfere with each other during operation, and both ends are loosely fitted into the drilling joint at an intermediate height position between the stirring blades to connect the two drilling joints. A horizontal mud co-rotation preventing member is provided, and a rotatable excavating blade having a sharp blade whose tip projects substantially downward is provided at the lowermost portion, and a solidifying material discharge nozzle connected to the solidifying material injection device is provided. The solidifying material injection device is provided with a solidifying material silo, a solidifying material pump or compressor for transferring the solidifying material, and a solidifying material supply pipe for transporting the solidifying material connected to the solidifying material discharge nozzle. Improved device.