JP2002363975A - Method for forming soil cement continuous wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a soil cement continuous wall conforming to the design. SOLUTION: The ground 1 is digged by injecting water or bentonite liquid, mud soil 4 is discharged onto the ground, and cement is mixed with the mud soil 4 on the ground to produce soil cement 3. After digging the ground down to a predetermined depth by a digging shaft 2, the digging shaft 2 is pulled up by injecting soil cement 3 into a preceding hole 8a to form the preceding hole 8a filled with the soil cement 3. In the same way, another preceding hole 8a filled with the soil cement 3 is formed apart from the preceding hole 8a by a fixed interval. The ground 1 between both preceding holes 8a is digged by the digging shaft 2 by injecting cement milk in such a way that both end parts are overlapped on opposing end parts of the preceding holes 8a formed apart from each other by the fixed interval to form a following hole 8b while the soil cement 3 in the preceding hole 8a has fluidity. Next, the digging shaft 2 is pulled up by injecting the soil cement 3 to fill the following hole 8b with the soil cement 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a continuous wall of soil cement in which continuous drilling holes are filled with soil cement, and more particularly to a method for forming a continuous wall of soil cement, the mud discharged to the ground. The present invention relates to a technology for effectively reusing the information.

[0002]

2. Description of the Related Art Conventionally, mud and cement-mixed mud generated during excavation of the ground have been disposed of by disposal, so that the disposal cost is high and the environment is deteriorated.
Therefore, Japanese Patent Application Laid-Open No. 2000-73354 is known as an example in which mud generated when excavating the ground is reused to reduce the amount of mud to be dumped. In this conventional example, when excavating the ground with a multi-axial excavation shaft, the excavation is performed while jetting water, and when reaching a predetermined depth, soil cement manufactured on the ground is jetted into the excavation hole instead of water to excavate the excavation hole. The soil cement column is filled with soil cement to create continuous soil cement columns for the number of shafts, and the soil cement columns are formed in the same way to make the soil cement columns continuous to form the soil cement continuous wall . Then, the soil cement that is ejected into the drilling hole when the drilling shaft is raised is manufactured by mixing the cement on the ground with the mud mixed with the water and the excavated soil discharged on the ground in the above process. .

However, when the next soil cement column is formed next to the soil cement column as described above, a new drill hole is required because the soil cement filled in the previously formed drill hole has fluidity. Soil with sufficient fluidity filled in the previously formed drilling hole when excavating while squirting water when drilling with the drilling axis when forming so as to partially overlap the previously formed drilling hole As the cement flows into the newly formed borehole, the water that is gushing out during excavation and the earth and sand that is excavated during the excavation flow into the previously formed borehole. The filled soil cement is different from the homogeneous state designed on the ground, and there is a problem that the continuous wall of the soil cement as designed cannot be formed.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and a soil cement manufactured on the ground by effectively using mud discharged on the ground, and a soil cement manufactured on the ground. It is an object of the present invention to provide a method for forming a continuous soil cement wall that can easily and accurately prepare a continuous soil cement wall as designed using the method.

[0005]

According to the present invention, there is provided a method for forming a continuous wall of soil cement according to the present invention, comprising the steps of:
In constructing the soil, the ground 1 is excavated while jetting water or bentonite liquid, and mud 4 in which water or bentonite liquid generated in the process of excavating the ground 1 and excavated soil are mixed.
Is discharged on the ground, and cement is mixed on the ground with the mud 4 discharged on the ground to produce soil cement 3, and the excavation shaft 2
After excavating the ground 1 to a predetermined depth while ejecting water or bentonite liquid, the excavation shaft 2 is pulled up while ejecting the soil cement 3 manufactured on the ground into the preceding hole 8a instead of water or bentonite liquid. The soil cement 3 is filled in the preceding hole 8a while discharging the mud 4 in which the water or bentonite liquid and the excavated soil mixed in the inside of the preceding hole 8a are filled to the ground. Another leading hole 8a filled with the soil cement 3 is formed at intervals, and then, while the soil cement 3 has fluidity in the leading hole 8a, both ends are excavated by the excavating shaft 2 while squirting cement milk. Are overlapped with the opposite ends of the preceding holes 8a formed at a certain interval.
Excavation of the ground 1 between to the predetermined depth, after excavation to the predetermined depth,
The excavating shaft 2 is pulled up while the soil cement 3 manufactured on the ground is ejected, and the trailing hole 8b is filled with the soil cement 3 so that each end of the trailing hole 8b and the leading hole 8a partially overlap. The present invention is characterized in that a continuous soil cement wall 9 in which soil cement 3 is filled in a continuous drilling hole 8 is formed.

By adopting such a method, the mud 4 discharged to the ground when forming the preceding hole 8a and the soil cement and soil discharged to the ground when forming the following hole 8b are formed. The soil cement 3 is manufactured on the ground by using the mixed mud 4, and is filled into the leading hole 8 a and the trailing hole 8 b by using the high quality soil cement manufactured on the ground to form the continuous drilling hole 8. The soil cement continuous wall 9 filled with the soil cement 3 can be formed, and the mud 4 can be effectively used. In order to effectively use the mud 4 in this way, in the present invention, the leading hole 8a
While the cement cement 3 has fluidity therein, while the cement milk is being ejected, both excavation shafts 2 are overlapped with the excavation shaft 2 so that both ends overlap the opposing ends of the advancing holes 8a formed at a predetermined interval. The ground 1 between 8a is excavated to a predetermined depth to form a trailing hole 8b, and after excavating to the predetermined depth, the excavating shaft 2 is pulled up while ejecting the soil cement 3 manufactured on the ground, and is moved into the following hole 8b. Since the soil cement 3 is filled and the trailing hole 8b is formed after the soil cement 3 is filled,
By excavating while ejecting cement milk when excavating the trailing hole 8b, a part of the high-quality soil cement 3 filled in the already formed preceding hole 8a and the trailing hole 8
The soil cement 3 mixed with the cement milk and the excavated soil spouting when excavating the b is filled in the trailing hole 8b at the time of excavation, and further manufactured on the ground spouted with the lifting of the excavation shaft 2. The high quality soil cement 3 is mixed with the high quality soil cement 3 so that the trailing hole 8b is filled with the soil cement 3 having a quality close to that designed on the ground. The soil cement continuous wall 9 filled with the quality soil cement 3 can be easily and accurately formed.

After the trailing hole 8b has been dug to a predetermined depth, the soil cement 3 manufactured on the ground is ejected and the excavating shaft 2 is pulled up to fill the trailing hole 8b with the soil cement 3 while pulling up the trailing hole. It is preferable that the soil cement 3 is injected into the trailing hole 8b by the volume of the excavating shaft 2 inserted into the trailing hole 8b. By adopting such a method, the trailing hole 8
When the drilling shaft 2 is pulled up while the soil cement 3 is ejected into the hole b, the soil cement 3 in the trailing hole 8b can be prevented from overflowing to the ground.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings.

FIG. 1 is a schematic diagram showing an apparatus used in the method for forming a continuous wall of soil cement according to the present invention. In the figure, reference numeral 14 denotes a multi-axis excavator having a plurality of excavation shafts 2. The plurality of excavating shafts 2 are driven to rotate by a drive unit 15. Each of the plurality of excavating shafts 2 is provided with a screw portion 16 on the outer periphery. A spout 10 is provided at the tip of all or a part of the plurality of excavating shafts 2, and a supply hose 18 is connected to the excavating shaft 2 via a swivel 17 provided at the upper end of the excavating shaft 2. Connected, supply hose 18,
The inside of the excavation shaft 2 and the jet port 10 at the tip of the excavation shaft 2 communicate with each other. The supply hose 18 has a pressure feeding supply unit 2 such as a pump.
6 for supplying water or bentonite liquid to the pumping supply section 26, a soil cement supply path 25 and a cement milk supply path 3 described later.
5 is connected, and the switching means 12 is provided in the part of the pressure feeding supply part 26, and the water or bentonite liquid is supplied to the ejection port 10 of the excavation shaft 2 by the pressure feeding supply part 26, or the soil cement 3 is supplied. Or supply of cement milk can be switched.

[0010] On the ground, there is provided a mud-removing unit 19 for pulverizing the mud 4 to finely pulverize it and adjust it to a target particle size. The mud which has been pulverized by the pulverizer 19 and adjusted to the target particle size is supplied to the mud hose 2 by the mud pump 20.
1, the water is supplied to a water content adjusting unit 22 for adjusting the water content of the mud 4. Moisture adjusting unit 22
The mud 4 whose moisture content has been adjusted by the above is sent to a mud stirring and storing section 5 provided with a mud stirring section 6 and stored therein while being stirred by the mud stirring section 6 so as not to be separated. The mud stored in the mud stirring means 6 is supplied to the soil cement production section 7 via a mud supply flow path 29, and the cement stored in the cement silo 23 is supplied to the soil cement production section 7 for cement supply. Part 2
4. The soil cement 3 prepared in the soil cement manufacturing unit 7 is manufactured by mixing the mud 4 and the cement that have been adjusted in the soil cement manufacturing unit 7 to produce the soil cement 3 having the designed composition. It is configured to be sent to the pressure feeding supply unit 26 via the supply channel 25.

As shown in FIG. 2, the crusher 19 has a crusher 19c in which a lower end opening of a hopper 19a is provided at an upper portion of one end and a discharge portion 19b is provided at a lower portion of the other end.
And a classifying unit 19 composed of a vibrating sieve for classifying the crushed mud supplied from the crushing unit 19c to a target particle size.
d, and a classification particle size stirring section 19e for stirring the mud which has been classified to the target particle size. A net 19f is stretched over the upper opening of the hopper 19a to prevent a large lump of soil from entering the hopper 19a.
The crushing unit 19c has a crushing shaft 19i rotatably mounted inside the outer cylinder 19g, and mud supplied from the hopper 19a along the crushing shaft 19i is provided directly below the lower end opening of the hopper 19a of the crushing shaft 19i. A transport screw portion 19h for feeding to the discharge portion 19b side is provided, and a crushing wing portion 19h for crushing mud is provided at another portion of the crushing shaft 19i. At one end of the classifying section 19d made of a vibrating sieve, a discharge section 19m for discharging the remaining large-diameter mud without passing through the vibrating sieve is provided. In the classifying particle size stirring section 19e, the mud which has been classified to the target particle size is supplied to the water content adjusting section 22, which will be described later, is stirred so that water and soil are not separated, and the mud in a state as homogeneous as possible is stabilized. Then, the water can be supplied to the water content adjusting unit 22.

The upper opening net 19f of the hopper 19a
And the mud discharged from the discharge portion 19m without passing through the vibrating comb of the classifying portion 19d.
Returned to 8.

The water content adjusting section 22 is a section for adjusting the water content of the mud adjusted to a target particle size. The water content adjusting section 22 is provided with a water supply section (not shown). The specific gravity of the mud adjusted to the target particle diameter supplied to the amount adjusting unit 22 is measured and water is added so as to have a necessary water amount, or the soil is added to adjust the water amount. Has become. Here, it is extremely difficult to remove water from the mud so that the mud contains water more than necessary and the water content is below a certain level, and if soil is added, excess mud is likely to be generated. It is preferable that the amount adjusting unit 22 adjusts the amount of water by adding water. For this reason, for example, by adjusting the amount of water or bentonite liquid ejected from the ejection port 10 of the excavation shaft 2 during excavation by the excavation shaft 2, the water content of the mud discharged to the ground is kept to a certain level or less. The water content of the mud can be adjusted by adding water to the water content adjusting unit 22. Of course, in the present invention, the water content of the mud 4 may be adjusted by dehydrating, adding a chemical, or adding soil.

The mud-removing unit 19 and the water content adjusting unit 22 constitute the mud adjusting means 13.

An opening / closing valve (not shown) is provided below the water content adjusting section 22. When the opening / closing valve is opened, the mud whose water content is adjusted by the water amount adjusting section 22 is sent to the mud stirring and storing section 5 and the mud is muddy. It is configured to be stored in the stirring storage section 5. The mud agitation storage unit 5 is configured such that a stirring shaft 6b with a stirring blade 6a constituting a mud agitating means 6 is rotatably housed in a cylindrical body. It is stored with stirring so as to be in a homogeneous state without separation. An opening / closing valve 29a is provided in a mud supply channel 29 for supplying mud from the mud stirring / storage section 5 to the soil cement production section 7. When the opening / closing valve 29a is closed, the mud is stored in the mud stirring / storage section 5. The mud which was not supplied to the soil cement production part 7 was stored in the mud stirring and storing part 5 by the pumping force of the rotation of the stirring shaft 6b with the stirring blade 6a constituting the mud stirring means 6 when the on-off valve 29a was opened. Mud is continuously and stably supplied to the soil cement production unit 7.

The soil cement production section 7 and the pressure supply section 26
Are connected via a soil cement supply channel 25, and the soil cement 3 produced by the soil cement production unit 7 is sent to the pressure feed unit 26 via the soil cement supply channel 25.

In addition to the above-mentioned soil cement supply channel 25, a drilling liquid supply channel 27 for supplying water or bentonite liquid, a soil cement supply channel 25, and a cement milk supply channel 35, which will be described later, are provided in the pressure feeder 26. Connected. The cement milk supply path 35 is connected to the cement milk supply section 36, and the drilling liquid supply path 11
Is connected. The pumping supply section 26 is provided with the switching means 12 so that water or bentonite liquid, soil cement 3, and cement milk can be switched and pumped.

The excavation of the ground 1 using the above-described apparatus to form the continuous soil-cement wall 9 is performed as follows.

That is, as shown in FIG. 3, the ground 1 is excavated while jetting water or bentonite liquid from the jet port 10 at the tip while rotating the excavating shaft 2 forward. By excavating the ground 1 while jetting water or bentonite liquid from the spout 10 at the tip while rotating the excavation shaft 2 in this way, the ground 1 can be easily excavated. During the excavation of the ground 1 by the excavation shaft 2, the mud 4 in which water or bentonite liquid and excavated soil are mixed is filled into the preceding hole 8 a where the excavation shaft 2 is being formed. Alternatively, the mud 4 in which the bentonite liquid and the excavated soil are mixed is discharged to the ground. The mud 4 discharged to the ground forms a mud pool portion 28 on the ground and is temporarily stored here. The mud pool portion 28 may be formed by digging a trench with a digging bucket machine 30 called a backhoe adjacent to the upper end opening of the digging hole 8 during digging, or a mud tank installed on the ground may be formed by digging a mud. The reservoir 28 may be used.

The mud 4 discharged to the ground and accumulated in the mud accumulating section 28 is supplied to a hopper 19a of a mud-removing device section 19 and cuts a groove dug by an excavating bucket machine 30 into a mud accumulating section 2.
In the case of 8, the excavating bucket machine 30 scoops the mud 4 in the pool 28 and supplies it to the hopper 19a. The mud 4 supplied to the hopper 19a
c and then pulverized, and then classified in a classification unit 19d to a target particle size, and agitated in a classification particle size stirring unit 19e so as to prevent separation of the mud having the target particle size after classification. The water is supplied from a pump 20 through a mud hose 21 to a water amount adjusting unit 22 for adjusting the water amount of the mud, and the water amount adjusting unit 22 adjusts the water amount to a target water amount.

The mud whose water content has been adjusted by the water content adjusting unit 22 is sent to and stored in the mud stirring and storing unit 5. In the mud stirring and storing section 5, the mud whose water content is adjusted by the mud stirring means 6 is collected and stored while being stirred so that the soil and water are not separated but in a homogeneous state.

As described above, the ground 1 is
While the drilling hole 8 is formed while excavating, the mud discharged to the ground is adjusted on the ground by the mud adjusting means 13 so that the mud is adjusted to the target state. It is stored while being stirred by the mud stirring means 6 in the mud stirring and storing section 5 so as not to be separated.

The excavation by the excavation shaft 2 is continued, and when the tip end of the excavation shaft 2 is slightly before reaching a target depth, the on-off valve 29a is opened to release the mud stored in the mud stirring and storing unit 5 into the soil cement production unit. 7, a predetermined amount of cement is supplied from the cement supply unit 24 to the soil cement production unit 7 and mixed to produce the intended soil cement 3.

As shown in FIG. 4, a plurality of holes corresponding to the number of the excavating shafts 2 are laid sideways so that the side ends partially overlap with each other when the excavating shaft 2 has completed the excavation to the target depth. When the leading holes 8a arranged in a line are formed, the switching means 12 is switched to supply the soil cement 3 produced by the soil cement production section 7 to the jet port 10 of the excavation shaft 2 by the pressure feeding supply section 26 instead of water or bentonite liquid. Then, the excavation shaft 2 is pulled upward while the soil cement 3 is ejected from the ejection port 10. In this case, the excavating shaft 2 is raised while continuing the normal rotation. In this way, when the drilling shaft 2 is pulled upward while rotating the excavation shaft 2 while ejecting the soil cement 3 from the ejection port 10, the leading hole 8a is filled with the soil cement 3 in order from the bottom as shown in FIG. At the same time, the soil cement 3 and the mud 4 are replaced in the preceding hole 8a such that the mud 4 filled in the preceding hole 8a is discharged to the ground by filling the soil cement 3. In this case, since the soil cement 3 has a large specific gravity, the soil cement 3 and the mud 4 rise up due to a difference in specific gravity, and are smoothly discharged to the ground and replaced.
Then, when the excavating shaft 2 is completely pulled up to the ground, a preceding hole 8 a filled with the soil cement 3 is formed in the ground 1.

Similarly, another preceding hole 8a filled with the soil cement 3 is formed at a predetermined interval from the preceding hole 8a as shown in FIG. The preceding holes 8a filled with the soil cement 3 are formed at regular intervals. The embodiment shown in the attached drawings shows an example in which two preceding holes 8a are first formed. Of course, the leading hole 8a is
Although a plurality of holes may be formed at regular intervals, the following description will be made on an example in which two preceding holes 8a are formed first.

After a plurality of leading holes 8a filled with the soil cement 3 are formed in a row at a predetermined interval as described above, the soil cement 3 filled in the leading holes 8a has a fluidity. The switching means 12 is switched and FIG.
As shown in the figure, while the cement milk is spouted from the spout hole 10 at the tip of the excavation shaft 2, both ends thereof are overlapped with the opposite end portions of the preceding hole 8 a formed at a predetermined interval by the multiaxial excavation shaft 2. Then, the ground 1 between the two leading holes 8a is dug to a predetermined depth to form a trailing hole 8b. In this case, the excavation shaft 2 excavates the trailing hole 8b while rotating forward, and in the embodiment shown in the attached drawings, the excavation shafts 2 on both sides of the plurality of excavation shafts 2 are formed at regular intervals. It is inserted into the hole at the opposite end of the preceding hole 8a and excavates. Here, since the soil cement 3 filled in the preceding hole 8a has fluidity, when excavating while ejecting cement milk when excavating the following hole 8b, the previously formed former hole is formed. A part of the high-quality soil cement 3 filled in the inside 8a, the cement milk spouted when excavating the trailing hole 8b, and the soil cement 3 in which the excavated soil is mixed with the trailing hole 8b Is filled inside.

When the trailing hole 8b is excavated by the multi-axial excavation shaft 2 to a predetermined depth while the cement milk is being ejected as described above, the switching means 12 is then switched to switch the ground as described above. 8 while squirting into the trailing hole 8b instead of the soil cement 3 produced in
As shown in FIG.
Move up and down in ~ 3m section.

Next, while continuing the ejection of the soil cement 3 from the lower end of the excavation shaft 2, the rotation of the excavation shaft 2 is switched to the reverse rotation, and the excavation shaft 2 is pulled up as shown in FIG. In this case, when the excavating shaft 2 is lifted, the amount of the spout of the soil cement 3 from the lower end is spouted by the volume of the excavating shaft 2 contained in the trailing hole 8b. By raising the excavation shaft 2 so as to eject only the volume of the excavation shaft 2 contained in the trailing hole 8b while reversing the excavation shaft 2, the soil cement 3 is hardly discharged to the ground, Drilling axis 2
And the soil cement 3 can be filled in the trailing hole 8b.

As described above, when digging through the trailing hole 8b, the digging is performed while jetting the cement milk, so that a part of the high quality soil cement 3 filled in the previously formed leading hole 8a. Then, soil cement 3 mixed with excavated soil and cement milk spouting when excavating the trailing hole 8b is filled into the trailing hole 8b at the time of excavation.
The high-quality soil cement 3 produced on the ground, which is ejected with the lifting of the soil, is mixed, so that the trailing hole 8b is filled with the soil cement 3 having a quality similar to that designed on the ground. . The trailing hole 8b is also provided in the leading hole 8a.
Some soil cement mixed with cement milk and excavated earth and sand may flow during excavation, and soil cement produced on the ground may flow when lifted.
Since the soil cement 3 filled in a is manufactured on the ground as designed, even if the soil cement partially mixed in the ground or the soil cement manufactured on the ground is mixed, the leading hole 8a The soil cement 3 inside maintains the quality close to that designed on the ground.

Next, another precedent hole 8a filled with the soil cement 3 is spaced apart from the precedent hole 8a located at the already formed end by a predetermined distance in the same manner as described above.
After that, while the fluidity of the soil cement 3 in the preceding hole 8a exists, the subsequent hole 8b is formed in the same manner as described above.
To form

In this manner, the leading hole 8a and the trailing hole 8b are formed one after another, and the high-quality soil cement 3 is filled in the continuous drilling hole 8 in which the leading hole 8a and the trailing hole 8b are continuous. Thus, the soil cement continuous wall 9 can be easily and accurately formed.

When the drilling shaft 2 is pulled up to form the trailing hole 8b, the soil cement 3 is hardly discharged to the ground, but when the drilling shaft 2 is drilled to form the trailing hole 8b, Preceding hole 8 being formed
a part of the high quality soil cement 3 filled in a.
Cement milk spouting when digging the trailing hole 8b,
Part of the soil cement 3 mixed with the excavated soil is discharged to the ground, and the soil cement 3 discharged to the ground is discharged.
Accumulates in the mud pooling section 28, and in the same manner as described above, is adjusted to the target particle size in the mud separator 19, and the water content adjusting section 2
The water content is adjusted in step 2 so that the target water content is obtained, and is stored while being stirred so as not to be separated in the mud stirring and storing section 5.
The soil cement 3 stored in the mud stirring means 6 is supplied to the soil cement production section 7 through the mud supply flow path 29, and the soil cement 3 and the cement are mixed to produce the soil cement 3 having the designed composition on the ground. The soil cement 3 manufactured by the soil cement manufacturing unit 7 in this way is jetted from the jet port when the excavating shaft 2 is pulled up when forming the following leading hole 8a and trailing hole 8b. . Here, the amount of the cement contained in the soil cement 3 discharged to the ground when the trailing hole 8b is formed is measured before or at the manufacturing stage in the soil cement manufacturing unit 7, and the soil cement manufacturing unit is determined based on the measurement result. 7, the amount of cement to be newly mixed is determined, and the soil cement 3 as designed is manufactured.

The flow rate of the water or bentonite liquid supplied from the supply hose 18 and the flow rate of the soil cement are measured by a flow meter 37, and the measurement data is sent to the control section 38, and the pressure feed section is controlled by the control section 38. The pressure feeding adjustment of 26 is performed. The control section 38 also controls various controls such as a cement supply control, an opening / closing control of the on-off valve 29a, and a water supply control.

In the present invention, the drilling liquid supply unit 11
Supply of water or bentonite liquid to spout 10 from
Switching means 12 for switching between the supply of the soil cement 3 from the soil cement production unit 7 to the jet port 10 and the supply of the cement milk is provided to simplify the structure of the apparatus, but the method of the present invention is realized. In doing so, the apparatus is not limited to the above-described apparatus, and an ejection port for ejecting water or bentonite liquid to the excavation shaft 2 and a soil cement 3 are provided.
And a spout for spouting cement milk may be separately provided.

[0035]

As described above, in the present invention, the mud discharged to the ground when forming the preceding hole and the soil cement and the soil discharged to the ground when forming the following hole are formed. Using the mixed mud to produce soil cement on the ground,
Using the high quality soil cement manufactured on the ground, filling the leading hole, the following hole, and forming the continuous soil cement wall filled with the soil cement in the continuous drilling hole,
This enables effective utilization of mud and soil cement discharged to the ground. Then, in order to effectively use the mud and sesoile cement discharged to the ground in this way, in the present invention, while the fluidity of the soil cement in the preceding hole is present, the excavation shaft is used while jetting cement milk. The trailing hole is formed by excavating the ground between the preceding holes to a predetermined depth so that both ends overlap the opposing ends of the preceding hole formed at the above-mentioned fixed interval, and after excavating to the predetermined depth, Since the excavation axis is pulled up while spouting the soil cement manufactured on the ground, the soil hole is filled with the soil cement to form the trailing hole filled with the soil cement,
In digging while squirting cement milk when excavating the trailing hole, part of the high quality soil cement filled in the already formed preceding hole and squirting when excavating the trailing hole Cement milk and soil cement mixed with excavated soil are filled into the trailing hole during excavation, and mixed with high-quality soil cement produced on the ground that is ejected with the lifting of the excavation axis. Therefore, the trailing hole will be filled with soil cement of a quality similar to that designed on the ground, and as a result, the leading hole and the trailing hole will be filled with continuous high quality soil cement. It is possible to easily and accurately form a continuous soil cement continuous wall.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus used for a method for forming a continuous soil cement wall of the present invention.

FIG. 2 is a cross-sectional view of the crushing device of the above.

FIG. 3 shows a production sequence of the present invention, in which (a) is an explanatory view showing a state in which a pit is formed by digging an excavation axis while jetting water or bentonite liquid, and (b) is the same as above. It is sectional drawing of a preceding hole.

4A and 4B show a production sequence of the present invention, in which FIG. 4A is an explanatory view showing a state where the water or bentonite liquid is changed to soil cement by digging to a predetermined depth, and FIG. It is.

FIG. 5 shows a manufacturing sequence of the present invention, in which (a) is an explanatory view of a state in which a drilling shaft is pulled up while ejecting soil cement, and (b) is a sectional view of a preceding hole in the same.

6A and 6B show a manufacturing order of the present invention, wherein FIG. 6A is an explanatory view showing a state in which the next preceding hole is formed, and FIG. 6B is a sectional view of the preceding preceding hole.

FIG. 7 shows a production sequence of the present invention. FIG. 7 (a) is an explanatory view showing a state where a trailing hole is formed by digging a drilling shaft while ejecting cement milk, and FIG. FIG.

FIG. 8 shows a production sequence of the present invention, and (a) is an explanatory view of a state in which the excavation axis is moved up and down while ejecting soil cement instead of cement milk when reaching a predetermined depth, b) is a sectional view of the same.

FIG. 9 shows a production sequence of the present invention, and FIG. 9 (a) is an explanatory view showing a state in which soil cement is filled in a trailing hole in which a drilling shaft is raised while jetting soil cement;
(B) is a sectional view of the above.

FIG. 10 shows a production sequence of the present invention, in which (a) is a state in which the next preceding hole is formed by a drilling shaft while jetting water or bentonite liquid, and (b) is a cross section of the same. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 2 Excavation axis 3 Soil cement 4 Mud 8 Continuous drilling hole 8a Leading hole 8b Trailing hole 9 Soil cement continuous wall

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tomoichi Nishida 1-7-24 Otemae, Chuo-ku, Osaka-shi Nariyuki Kogyo Co., Ltd. (72) Inventor Kenichi Hata 1-7-24 Otemae, Chuo-ku, Osaka-shi Nariyuki Kogyo Co., Ltd. F term (reference) 2D049 GA12 GA16 GB06 GC11

Claims (2)

[Claims] When excavating the ground with an excavating shaft to form a continuous soil cement wall, the ground is excavated while jetting water or bentonite liquid, and water or bentonite liquid generated in the process of excavating the ground and excavated soil are formed. Discharge the mixed mud to the ground, mix cement on the ground with the mud discharged to the ground to produce soil cement, excavate the ground to a predetermined depth while gushing water or bentonite liquid with a drilling axis, The soil cement produced on the ground is replaced with water or bentonite liquid, and the excavation axis is pulled up while ejecting into the preceding hole to discharge mud mixed with water or bentonite liquid filled in the preceding hole and excavated soil to the ground. While filling the leading hole with soil cement, and then another leading hole filled with soil cement at a certain distance from the leading hole in the same manner. A hole is formed, and then, while the soil cement in the preceding hole has fluidity, both ends overlap with the opposite end of the preceding hole formed at a constant interval by the excavation shaft while ejecting cement milk. Excavating the ground between the preceding holes to a predetermined depth to form a trailing hole, and after digging to the predetermined depth, pulling up the excavation axis while ejecting soil cement manufactured on the ground, and soiling into the trailing hole A cement-cement continuous wall characterized by forming a cement-cement continuous wall filled with soil cement in a continuous excavation hole in which each end of a trailing hole and a leading hole partially overlaps with cement. Creation method. 2. The excavation which is inserted into the trailing hole when the trailing hole is excavated to a predetermined depth and the soil cement is filled into the trailing hole while the excavating shaft is being lifted while the soil cement manufactured on the ground is being ejected. 2. The method for forming a continuous wall of soil cement according to claim 1, wherein the soil cement is ejected into the trailing hole by the volume of the shaft.