JPH0220715A - Creation device using ground improving material - Google Patents

Abstract

PURPOSE:To efficiently carry out excavation and mixing agitation by installing shearing pawls onto the agitation blades installed at the top edges of the inner and outer pipes which revolve reversely each other and installing an excavation blade at the top edge of the inner pipe. CONSTITUTION:Agitation blades 5 and 5' are integrally installed at the top edge parts of an outer pipe 3 which is connected with a driving device and revolves reversely and an inner pipe 4 which is installed into the outer pipe 3 and whose top edge part is extended and projected, and a comb-shaped cutting edge-shaped shearing pawl 6 is fixedly installed into the agitation blades 5 and 5' downwardly. An agitation blade 8 having a pit 7 is installed integrally at the top edge of the inner pipe 4. Therefore, the corevolution of the excavated soil due to the agitation blades 5 and 5' and the excavation blade 8 is prevented, and the sure shearing action can be provided.

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology is a technology for the structure of a device that creates soil cement piles, etc. in the ground when improving soft ground such as reclaimed land in rivers, lakes, coastal areas, etc. Belongs to a field.

<Summary of the gist> The invention of this application forms a hole in the ground during construction work to improve soft ground such as a shallow coast, a river, a lake, etc., and mixes the soil from the hole with cement milk, etc. This is a device for creating improved materials such as soil cement piles by stirring and mixing improving materials, and an upper stirring blade is provided at the tip of the outer pipe of the double pipe to extend laterally5, and the inside of the outer pipe is This invention relates to a ground improvement material preparation device, in which a lower stirring blade is provided at the tip of an inner pipe that is inserted through the pipe and extends from its tip, and both stirring blades are connected to a relative reverse rotation device, In particular, the inner and outer tubes of the double tube can be freely rotated in reverse, the stirring blades at the tip of the outer tube and the stirring blades at the tip of the inner tube are each provided with shear claws, and the tip of the inner tube is provided with a digging blade. This invention relates to a ground improvement material preparation device.

<Prior art> As is well known, in Japan, where the land is limited, effective land use is an extremely important issue. Research and development of various improvements have been carried out, and various construction works have been put into practical use.

Among these improvement techniques, there is a ground improvement material creation technique in which a hole is formed in the soft ground and the soil from the hole is mixed and stirred with an improvement material such as cement milk to form soil cement piles, etc. , form a hole with a casing pipe, etc.
A stirring blade provided in a drilling device is used to mix and stir soil and an improvement material such as cement milk, and for example, the invention disclosed in Japanese Patent Application Laid-Open No. 62-264212 has been developed.

<Problems to be Solved by the Invention> However, when forming a soil improvement material, if the shearing resistance associated with stirring and mixing the soil and an improvement material such as cement milk is large due to various differences in the properties of the ground and soil, the use of an agitation blade The disadvantage is that soil, cement milk, or a mixture thereof cannot rotate around the stirring blades and apply sufficient shear, and as a result, soil with sufficient strength cannot be produced. There were drawbacks such as the possibility that cement piles etc. could not be formed.

In addition, when such shear resistance is large, the torque applied to the stirring blade becomes large, and as there is a recent tendency to build stirring blades with large diameters in order to increase construction efficiency, the construction equipment This also resulted in a disadvantage that not only the initial cost but also the running cost was high.

In addition, as shown in the invention disclosed in JP-A No. 62-264212, in order to deal with this problem, the stirring blades are arranged in two stages, upper and lower, and are rotated in opposite directions to reduce the torque. There are techniques that eliminate the co-rotation phenomenon for stirring blades.

In addition, as the weight of heavy machinery itself increases and the torque applied during construction increases, it becomes difficult to achieve stable construction, and drilling and mixing are not differentiated, resulting in poor construction efficiency. Moreover, there was also the problem that it was difficult to achieve sufficient shearing with the smaller stirring blades.

<Purpose of the Invention> The purpose of the invention of this application is to solve the problems of constructing soil cement piles, etc. related to ground improvement based on the above-mentioned prior art, and to solve the problems while reducing the torque during construction. Construction work is carried out by improving the shearing efficiency of the soil within the soil, ensuring that the agitation and mixing of the ±19 and improving materials such as cement milk are carried out in accordance with KU if, and construction of the ground improvement is carried out with high efficiency. The objective is to provide an excellent ground improvement material preparation device that will benefit industry in various fields of technological application.

<Means/effects for solving the problem> In order to solve the above-mentioned problem, the structure of the invention of this application, which is based on the scope of the above-mentioned patent claims, is based on the above-mentioned purpose. When creating the improved material, a cutting blade at the tip of a double pipe and a predetermined number of stages of stirring blades above and below are reduced and inserted through a hinge provided in the middle of the casing pipe with a predetermined diameter. When extending and drilling holes, the bit of the tip drilling blade is used to excavate the hole, and at the same time, the stirring blade installed at a predetermined position on the top of the blade is extended outward via a hinge to increase the diameter and rotate and stir the hole. The casing pipe is also connected to the outer pipe of the stirring blade via a hook so that it can be rotated integrally with the outer pipe of the stirring blade, which allows for good transmission of motion and highly efficient drilling and drilling. During drilling, or after drilling to a predetermined depth, the construction equipment is pulled up and rotated to inject an improvement material such as cement milk into the soil and form the predetermined ground. During this time, the cast stirring blades are rotated in opposite directions by the outer and inner tubes to ensure shearing action is applied even when the soil is highly viscous, etc. In addition, technical measures have been taken to efficiently mix and stir soil, cement milk, etc., and to ensure improved landscaping even if the building equipment is small.

<Example> Next, one example of the invention of this application will be described below based on the drawings.

The illustrated embodiment is a mode in which soil cement piles are constructed as a ground improvement material using cement milk in soft ground.
As shown in FIG. 4, the forming device 1 includes an outer tube 3 which is connected to a drive device 2 at the upper end and rotates in opposite directions to each other in a predetermined manner, and an outer tube 3 which is internally connected to the outer tube 3 and whose tip portion extends and projects. A stirring blade 5.5' is integrally provided at the tip of the outer tube 3 and the tip of the inner tube 4, respectively, and a comb-like shearing air 6. 6... 6', 6'... are fixed in one direction, and a bit 7.7 is installed at the tip of the inner tube 4.
An excavating blade 8 having a smaller diameter than the agitating blade 5.5' having... The overall torque of the agitating blade 5 is balanced so that no load is applied to the drive device 2, and when the excavated soil is highly viscous during drilling to form a hole,
．． 5', there is no co-rotation of the excavated soil by the excavating blades 8, and shearing action is reliably applied.

In the drive device 2, a gear mechanism is provided with a suitable design so that the outer tube 3 and the inner tube 4 rotate in opposite directions with a predetermined torque.

As shown in Fig. 1.2.3, in the forming apparatus 1, a steel casing pipe 9 that forms the core material of the improved material with a predetermined diameter is provided as a side core to the outer pipe 3. and the outer tube 3
A pair of footer fins 11.
Hook 12.12 is engaged with the tip of outer tube 3.
power is transmitted to the casing pipe 9 so that the casing pipe 9 can rotate together with the outer pipe 3, and the hook fin 11 for the hook 12 is connected to the outer pipe 3 for the casing pipe 9. It can be engaged and separated by insertion and removal.

Further, the stirring blades 5.5' are made of the same size and have a length larger than the inner diameter of the casing pipe 9, and a length smaller than the inner diameter of the casing pipe 9. When it is inserted into the container, it is folded and reduced in size, and after it is set, it is expanded to a large size to effectively perform mixing, stirring, and shearing action.

In the above-mentioned configuration, when constructing soil cement piles as improvement materials in a predetermined soft ground, the stirring blades 5 of the outer pipe 3 and the stirring blades 5' of the inner pipe 4 of the construction device 1 are connected to their hinges 13.13. The outer diameter of the outer tube 3 is reduced by folding through the hook fins 11 of the outer tube 3, and the casing pipe 9 is relatively inserted thereinto.
11 to the hook 12.12 of the casing pipe 9.
The stirring blades 5 of the outer tube 3 and the stirring blades 5' of the inner tube 4 extend from the tip of the casing pipe 9 through hinges 13 and 13. 5.5'
The drive unit 2 is opened and exposed to the cultivated ground through the designated heavy equipment.
is activated to reversely rotate the outer tube 3 and the inner tube 4 to be installed at a predetermined angular velocity, thereby causing the hook fins 11, 11,
Through the engagement of the hooks 12 and 12, the casing pipe 9 also rotates in one direction together with the outer tube 3, and the inner tube 4 rotates in the opposite direction.
The drilling blade 8 at the tip of the inner pipe 4 drills a predetermined hole using the bit 7.7, and also the upper and lower stirring blades 5
．． 5' also assists drilling with its shear wind 6.6',
The specified hole is drilled.

During this time, the gauging pipe 9, the stirring blade 5.5' and
Since the digging blades 8 rotate in opposite directions, the digging resistance is small.
Furthermore, there is no rotation of the excavated soil during excavation, and the excavation is carried out smoothly.

Then, the stirring blade 5.5' sheared the wind 6.6'6.6'
The excavated soil is sheared while rotating in reverse,
In the meantime, if necessary, cement milk as an improvement material is injected from the casing pipe hole (not shown) through the inner pipe 4 during drilling, and is stirred and mixed with the excavated soil by the stirring blade 5.5'. Cement milk is injected during the ascent process after the excavation is performed, and depending on the design, cement milk is injected while repeating the ascent and descent cycle in a predetermined manner to form an improved material.

Finally, the casing pipe 9 is penetrated into the stirred mixture of cement milk and excavated soil as a side core, and the upper and lower stirring blades 5.5' are By engaging the casing pipe 9 with its lower end, it is folded up via the hinge 13.13 and rises within the casing pipe 9, leaving the casing pipe 9 in the agitated mixture of cement milk and excavated soil. ``The two piles are made to form a predetermined composite pile.''

After the stirring blades 5,5' and the excavating blades 8 are raised to the ground surface, the heavy machinery is moved to a predetermined position and used for the next stage of creation.

In this way, a soil cement pile is created, or in the creation process, the stirring blades 5 and the casing pipe 9 of the outer pipe 3, and the stirring blades 5' and the excavating blades 8 of the inner pipe 4 rotate in opposite directions. Therefore, even if the excavated soil or the mixture of the excavated soil and cement l-milk has a high viscosity, it will not stick together, and therefore, misalignment will not occur, and the torque is small and the stirring blade 5.5' The shearing action on the excavated soil is reliably carried out and the improved material is formed as designed.

Therefore, an improved material such as a soil cement pile with good and sufficient strength is created without any unmixed parts.

The embodiments of the invention of this application are, of course, not limited to the above-mentioned embodiments. For example, a casing pipe may be provided with spiral protrusions on its inner and outer surfaces to serve as a mixing agitator for cement milk and excavated soil. Various aspects can be adopted, such as trying to tighten the .

In terms of design changes, the distance between the stirring blades in the latter stage, or
It is also possible to change the distance between the excavation blade and the stirring blade as appropriate depending on the properties of the ground.

<Effects of the Invention> As described above, according to the invention of this application, basically when constructing improvement materials such as soil cement piles in soft ground, the outer pipe and the inner pipe of the double pipe of the outer pipe and the inner pipe are By folding the inner pipe into a predetermined number of upper and lower stages and installing expandable and contractible stirring blades so that they rotate in opposite directions, the inner tube can be folded up and down into a predetermined number of stages, and the stirring blades are installed so that they rotate in opposite directions. The soil is reliably sheared, and there is little digging resistance due to reverse rotation, and the stirring and mixing with the injected improvement materials such as cement milk is sufficient, and because the torque is low, the diameter of the stirring blade is large. Even when creating large-sized improved materials using cement milk, no unstirred parts are formed, and therefore, the mixing and stirring efficiency of cement milk and excavated materials is high, and sufficient strength as designed can be achieved. The excellent effect of forming an improved material with Qin.

In the past, even if the construction equipment was made large, it did not require much power, and the improvement material could be improved as designed regardless of the viscosity of the ground.

Therefore, the design of the stirring blade installed in the latter stage or the distance between the stirring blade and the excavation entrance can be changed according to the properties of the ground, making it possible to use the preparation equipment more flexibly. The effect is that a predetermined improved material can be created accordingly.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of one embodiment of the invention of this application, and the drawing is a first embodiment of the invention of this application.
The figure is an overall schematic partial cross-sectional side view, and Figure 2.3 is Figure 1 ■-
(2), I[I-III plan view, and FIG. 4 is a schematic side view of the entire forming apparatus. 3... Outer tube, 5... Stirring blade, 4... Inner tube, 5'... Stirring blade, 1... Creation device, 6.6'
...Shearing wind, 8...Drilling N, 13...Hinge, 9...Casing pipe, 11.12...Hook

Claims (4)

[Claims] (1) An upper stirring blade is provided at the tip of the outer tube, a lower stirring blade is provided at the tip of the inner tube that is inserted into the outer tube and extends forward, and both stirring blades are made to rotate freely in opposite directions. A ground improvement material making device characterized in that a predetermined number of shearing claws are attached to each of the above-mentioned stirring blades, and further, a digging blade is attached to the tip of the inner pipe. (2) The soil improvement material preparation device according to claim 1, wherein both of the stirring blades are expandable and contractible via hinges located in the middle of the blades. (3) The ground improvement material preparation device according to claim 2, wherein a casing pipe is attached to the outer pipe. (4) Claim 3, characterized in that the outer pipe is linked to the casing pipe via a hook.
Ground improvement material preparation equipment as described in section.