JP2003171953A - Construction device and construction method of underground continuous wall with dry excavation part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform work for improving the ground below a definite depth while performing dry excavation of the ground above the definite depth in the ground. <P>SOLUTION: An upper cutter post 2 for tensioning an upper endless chain 5 having respectively an upper driving wheel 3 and an upper idle wheel 4 in an upper end part and a lower end part, and having an excavating blade 6 between the upper driving wheel 3 and the upper idle wheel 4, and a lower cutter post 7 for tensioning lower endless chain 10 having similarly respectively a lower driving wheel 8 and a lower idle wheel 9 in an upper end part and a lower end part, and having an excavating blade 11 between the lower driving wheel 8 and the lower idle wheel 9, are connected in the depth direction. The ground above the definite depth is dryly excavated by the upper endless chain 5 of the upper cutter post 2, and the ground bellow the definite depth is improved by the lower endless chain 10 of the lower cutter post 7. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for constructing an underground continuous wall with a hollow excavation portion, which is used for improving the ground of a deeper depth while digging a shallow depth below the ground. It is about the construction method using it.

[0002]

2. Description of the Related Art For example, in the case of constructing an underground continuous wall for supporting a structure having a basement floor, the underground continuous wall is constructed below a certain depth in the ground. In this case, the ground that is shallower than a certain depth is dug to enable root cutting.

In order to improve the ground deeper than a certain depth by digging the ground shallower than a certain depth by one-time construction, two base machines are provided as in Japanese Patent Laid-Open No. 9-296441 shown in FIG. After supporting the cutter post, the cutter post on the front side in the traveling direction of the base machine digs the entire depth of the ground including the section of empty digging and the section of ground improvement, and then the endless chain is stretched over the section to be improved. It is necessary to improve the ground by the endless chain of the rear cutter posts that have been installed.

According to this method, the two cutter posts are arranged side by side in the advancing direction of the base machine, so that the cutter post on the rear side is moved forward when the cutter post on the front side is most advanced with respect to the front side of the base machine. Since it is located rearward from that, the stroke in which the cutter post on the rear side can reciprocate is shorter than in the case of one stroke.

Therefore, the horizontal distance of the area where the ground can be improved by the cutter post on the rear side is only about a half of the frame (base) of the base machine that supports the cutter post, and the efficiency of the ground improvement per construction is high. Is low.

Since the cutter post for blank excavation precedes, the ground excavated from the ground improvement area is always laterally adjacent to the ground improvement area. And the concentration of the solidifying material liquid may decrease.

Increase the efficiency of ground improvement per construction,
In order to avoid a decrease in the concentration of the solidifying material liquid, the base machine for hollow mining and the base machine for ground improvement should be independent or
It is conceivable to use one cutter post for two ways: empty digging and ground improvement, but it is effective to prepare two base machines with one construction target ground like the former, which is the operating efficiency of the base machine itself. Will be worse and cost will increase.

In the latter method, the insertion of the cutter post into the ground and the traverse work must be repeated twice in one construction section, and at the time of empty digging, the endless chain is circulated in the section of the entire length of the cutter post to improve the ground. Occasionally, it is necessary to change the circulation section of the endless chain each time it traverses so that the endless chain is circulated in a section deeper than a certain depth, resulting in extremely low work efficiency.

In FIG. 1 of Japanese Patent No. 2711057 shown in FIG. 6, two cutter posts having different tip depths are arranged side by side in the traveling direction of the base machine and are supported. This is a device for reducing the resistance received by the post, and it is not possible to construct a ground improvement body below a certain depth in the ground.

From the background described above, the present invention is disclosed in JP-A-9-296441.
It is an object of the present invention to propose an apparatus and method for constructing a continuous underground wall below a certain depth in the ground while efficiently forming a hollow excavation portion.

[0011]

In the present invention, a construction device is constructed by connecting an upper cutter post and a lower cutter post in the depth direction, and the endless chain of the upper cutter post excavates the ground shallower than a certain depth, The bottom endless chain of the lower cutter post improves the ground to a depth below a certain depth, so that a single base machine can traverse the cutter post (building device) once to build a continuous underground wall below a certain depth. To be able to do.

The upper cutter post has an upper drive wheel and an upper idle wheel at the upper end and the lower end, respectively, and an upper endless chain having an excavating blade is stretched between the upper drive wheel and the upper idle wheel. The lower cutter post is supported by being connected to the upper cutter post, and has a lower drive wheel and a lower idle wheel at the upper end and the lower end, respectively, and a lower endless chain having an excavating blade between the lower drive wheel and the lower idle wheel. Is stretched.

By connecting the upper cutter post and the lower cutter post in the depth direction and arranging them in series, the entire cutter post (construction device) can move between both ends in the traveling direction of the frame (stand) of the base machine. Since the horizontal movement distance is larger than when the cutter posts of are parallel to the traveling direction of the base machine, the efficiency of ground improvement per construction is improved.

Further, since the upper cutter post and the lower cutter post are connected in series, the ground excavated in the ground improvement area is not laterally adjacent to each other except for the ground excavation portion on the ground surface side. It is possible to avoid a situation in which the solidifying material liquid in the ground improved area permeates into the digging portion side and the concentration of the solidifying material liquid in the ground improving portion decreases.

Since the upper cutter post and the lower cutter post are connected in series, when the entire cutter post traverses, the lower cutter post tends to incline rearward in the traveling direction due to the resistance received by the lower cutter post.
The upper cutter post and the lower cutter post are connected so that the ground improvement function of the lower cutter post is not lost.

In order to secure the ground improvement function of the lower cutter post, the upper cutter post for supporting the lower cutter post is composed of two cutter post members arranged in parallel in the thickness direction as set forth in claim 2. It is suitable to sandwich the lower cutter post between both cutter post materials of the upper cutter post so as to support both cutter post materials. In this case, each cutter post material has an upper drive wheel, an upper idle wheel, and an upper endless chain, and the upper drive wheels of each cutter post material rotate in synchronization.

In the case of claim 2, the lower cutter post has two
By being sandwiched and supported by the cutter post material of the book, the effect of restraining the inclination of the lower cutter post by the upper cutter post can be enhanced and the inclination of the lower cutter post can be suppressed, so that the stability is improved, The construction accuracy of the underground wall is improved.

Further, in claim 2, for example, as described in claim 6, the axis of the lower drive wheel of the lower cutter post and the axis of the upper idle wheel of the upper cutter post are made coaxial with each other. When the lower drive wheel is rotated in synchronism with the rotation of the upper idle wheel, it becomes possible to stably transmit the rotational force from the upper idle wheel to the lower drive wheel, and the upper idle wheel can be stably transmitted. It is possible to suppress vibration of the lower drive wheels.

The upper endless chain is circulated by the rotation of the upper drive wheel. For example, the lower drive wheel is rotated in accordance with the rotation of the upper idle wheel of the upper cutter post to rotate the lower drive wheel. When the lower endless chain is circulated along with the circulation of the upper endless chain by the rotation of the upper drive wheel as described in claim 3, the lower endless chain is driven independently. The operation for circulating the upper endless chain and the lower endless chain is simplified.

The solidifying material liquid that the lower endless chain of the lower cutter post stirs and mixes with the excavated soil can be supplied to the ground through a pipe other than the cutter post, but is supplied within the range of the lower cutter post. For example, since the entire length of the lower cutter post is spread by the circulation of the lower endless chain, when supplying through the cutter post, the solidified material discharge port is formed at any part of the lower cutter post as described in claim 7. .

The upper cutter post and the lower cutter post traverse (translate) along the pedestal of the base machine while the base machine is stopped, so that during the construction, the depth of the digging portion by the upper cutter post and the lower cutter post The depth of the ground improvement part is maintained constant, but if the upper cutter post is supported so as to be able to move up and down along the mast supported by the base machine base as described in claim 8, it will be empty for each construction section. The depth of the dug portion and the depth of the ground improvement portion can be changed.

Construction of the underground continuous wall using the construction apparatus according to any one of claims 1 to 8 allows the upper endless chain to circulate around the upper cutter post as described in claim 9 and While supplying the solidifying material liquid to the, while circulating the lower endless chain around the lower cutter post,
This is done by traversing the lower cutter post and the upper cutter post while inserting them into the ground.

The lower endless chain stirs and mixes the excavated soil excavated by the excavating blade with the solidifying material liquid supplied into the ground,
The ground in the section between both ends of the lower cutter post will be improved to construct a continuous underground wall. The upper endless chain digs the ground in the section from the upper end of the lower cutter post to the ground surface by its digging blade, and the construction device forms the digging part simultaneously with the construction of the underground continuous wall by traversing once.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION A construction apparatus 1 of the invention described in claim 1 is an upper cutter post 2 on which an upper endless chain 5 is stretched, and an upper cutter post 2 as shown in FIGS.
Is connected and supported in the depth direction to the lower endless chain 10
Is composed of a lower cutter post 7 which is stretched.

An upper drive wheel 3 and an upper idle wheel 4 are connected to the upper and lower ends of the upper cutter post 2, respectively, and an upper endless chain 5 having an excavating blade 6 is provided between the upper drive wheel 3 and the upper idle wheel 4. It is stretched. The upper endless chain 5 circulates due to the rotation of the upper drive wheel 3, and digs the ground near the surface.

Similarly, a lower drive wheel 8 and a lower idle wheel 9 are connected to the upper end portion and the lower end portion of the lower cutter post 7, respectively, and a drilling blade 11 is provided between the lower drive wheel 8 and the lower idle wheel 9.
The lower endless chain 10 having the above is stretched. The lower endless chain 10 is circulated by the rotation of the lower drive wheel 8, and while excavating the ground deeper than the empty dug portion 20 dug by the upper endless chain 5, the excavated soil and the solidifying material liquid supplied from the ground are mixed and mixed. Then, the ground is improved and the underground wall 21 is constructed.

The upper cutter post 2 is supported so as to be able to move up and down along the mast 14 supported by the base 13 of the base machine 12, and the lower cutter post 7 is connected to and supported by the upper cutter post 2. It is supported by the base machine 12 so as to be able to move up and down together with 2.

From the base machine 12, the upper drive wheel 3 of the upper cutter post 2 and the lower drive wheel 8 of the lower cutter post 7 can be independently powered.
As shown in, the lower drive wheel 8 can be interlocked with the upper idle wheel 4 that is rotated by the upper endless chain 5 that circulates with the rotation of the upper drive wheel 3, so that at least power is applied to the upper drive wheel 3. It's enough.

In FIG. 3, an upper idle wheel 4 and a lower drive wheel 8 are provided.
In order to interlock, the axis of the lower drive wheel 8 of the lower cutter post 7 and the axis 4a of the upper idle wheel 4 of the upper cutter post 2 are made coaxial, and the lower drive wheel 8 is rotated in synchronization with the rotation of the upper idle wheel 4. I am trying to let you. In addition, the lower drive wheel 8 can be synchronized with the rotation of the upper idle wheel 4 by combining gears and the like.

In the case of FIG. 3, the upper idle wheel 4 rotates with the circulation of the upper endless chain 5 by the drive of the upper drive wheel 3, and at the same time the lower drive wheel 8 rotates, and accordingly, the lower endless chain 10 circulates. To do.

Also, in the drawing, the upper cutter post 2 is provided in order to stabilize and support the lower cutter post 7 on the upper cutter post 2 and to stably transmit the rotational force from the upper idle wheel 4 to the lower drive wheel 8. It is composed of two cutter post materials 2a and 2a, and the lower cutter post 7 is sandwiched between both cutter post materials 2a and 2a and is supported by the upper cutter post 2.

The configurations of the upper cutter post 2 and the lower cutter post 7 and the combination of the two are shown, and the lower cutter post 7 is supported by a single cutter post member 2a which becomes the upper cutter post 2. Is decided.

Both the upper cutter post 2 and the lower cutter post 7 are assembled in a required length by connecting a cutter post unit having a certain unit length. Since the upper cutter post 2 digs empty in the section that is inserted into the ground, the section that is inserted into the ground is empty.
The lower cutter post 7 is adjusted to have a length corresponding to the depth of 20, and the lower cutter post 7 improves the ground over the entire length, so that the total length is adjusted to be the depth of the underground continuous wall 21.

The upper cutter post 2 and the lower cutter post 7 are the lower cutter post 7 when the entire construction device 1 is traversed.
Does not incline rearward in the traveling direction due to resistance, and is integrally connected so that the function of ground improvement by the lower cutter post 7 is not lost.

In FIG. 3, as described above, the upper cutter post 2 is composed of two cutter post members 2a, 2a, and the lower cutter post 7 is arranged between them, and each cutter post member 2a of the upper cutter post 2 is arranged. , The cutter post unit at the lower end of 2a and the cutter post unit at the upper end of the lower cutter post 7 are integrally formed so that the upper cutter post 2 and the lower cutter post 7 are integrated. The method of does not matter.

When the construction device 1 is inserted into the ground, the lower endless chain 10 is circulated by driving the upper drive wheel 3 of the upper cutter post 2 or the lower drive wheel 8.
The excavating blade 11 is inserted into the ground by descending while excavating the ground.

The lower cutter post 7 is inserted to the target depth while supplying the drilling liquid such as fresh water or muddy water as necessary without supplying the solidifying material liquid. Bottom endless chain
Since 10 is inserted into the excavated ground, it is not necessary to supply the drilling liquid when inserting the upper cutter post 2 while circulating the upper endless chain 5.

After inserting the lower cutter post 7 to the target depth, the construction apparatus 1 is traversed while supplying the solidifying material liquid such as cement milk to the section of the lower cutter post 7. The solidifying material liquid is supplied through a pipe or the like that is separate from the building apparatus 1, and also through the upper cutter post 2 or both cutter posts 2 and 7.

FIG. 3- (a) shows an example in which the solidifying material liquid is supplied through the upper and lower cutter posts 2 and 7, and (b) shows an example in the case where it is supplied through the upper cutter post 2. Figure 3
-In (a) and (b), the white arrows indicate the flow of the solidifying material liquid.

In (a), a passage 18 for supplying the solidifying material liquid is arranged inside the lower cutter post 7, and is connected to a passage 17 for supplying the solidifying material liquid arranged inside the upper cutter post 2.
This is a case where the solidifying material liquid is supplied to the lower discharge port (not shown) formed at the lower end portion of the lower cutter post 7 or the like.
(b) is a case where the passage 17 of the upper cutter post 2 is arranged up to the upper end portion of the lower cutter post 7 and the solidifying material liquid is discharged from the solidifying material discharge port 19 formed in the upper end portion of the lower cutter post 7.

In any case, the solidifying material liquid is spread over the entire length of the lower cutter post 7 by the circulating lower endless chain 10 and is stirred and mixed with the excavated soil.

Lower endless chain of lower cutter post 7
After starting the stirring and mixing of the excavated soil and the solidifying material liquid by 10, the extension of the hydraulic cylinder 15 installed between the upper cutter post 2 and the base machine 12 causes the base machine 12 to
The entire construction apparatus 1 traverses in the direction shown by the arrow in FIG.

Lower endless chain due to traversing of the construction device 1
10 is a mixture of the excavated soil excavated by the excavating blade 11 and the solidifying material liquid supplied into the ground to improve the ground in the section between both ends of the lower cutter post 7 to form the underground continuous wall 21. To construct. The upper endless chain 5 digs the ground in the section from the upper end of the lower cutter post 7 to the ground surface by the digging blade 6 to form the digging portion 20.

After traversing, while the hydraulic cylinder 15 is contracted, the base machine 12 is moved forward by the traveling device 16 such as a crawler, so that the construction device 1 returns to the state before the traverse start without changing the position with respect to the ground. Traverse by the hydraulic cylinder 15 is repeated.

When excavating the ground while traversing the building device 1, with respect to the problem of the inclination of the lower cutter post 7 to the rear side in the traveling direction, an inclinometer is built in the lower cutter post 7 and the building device is installed. When the lower cutter post 7 is no longer vertical when excavating the ground by traversing 1, the construction device 1 is caused to traverse backward, the lower cutter post 7 is returned to the vertical state, and then the construction device 1 is again oriented forward. It can be made to traverse and excavate the ground.

[0046]

[Effects of the Invention] The upper cutter post and the lower cutter post are connected to each other in the depth direction, the upper endless chain of the upper cutter post excavates the ground shallower than a certain depth, and the lower endless chain of the lower cutter post excavates the deeper than a certain depth. In order to improve the ground, it is possible to construct a continuous underground wall below a certain depth in the ground by traversing the cutter post with a single base machine once.

In particular, by connecting the upper cutter post and the lower cutter post in the depth direction and arranging them in series, the entire cutter post can be moved between both ends in the traveling direction of the frame of the base machine, and the horizontal distance thereof can be expanded. The efficiency of ground improvement per construction is improved.

Further, since the upper cutter post and the lower cutter post are connected in series, since the ground dug in the ground improvement area does not laterally adjoin, the solidified material liquid in the ground improvement area is It is possible to avoid a situation where the concentration of the solidifying material liquid in the ground improvement portion lowers by penetrating into the empty dug portion side.

In the second aspect, the upper cutter post that supports the lower cutter post is composed of two cutter post materials, and the lower cutter post is sandwiched between both cutter post materials of the upper cutter post and supported by both cutter post materials. Therefore, the effect of restraining the inclination of the lower cutter post by the upper cutter post is enhanced, and the inclination of the lower cutter post can be suppressed. As a result, the stability is improved and the construction accuracy of the underground wall is improved.

In the third and fourth aspects, since the lower endless chain is circulated along with the circulation of the upper endless chain by the rotation of the upper drive wheel, the lower endless chain is circulated independently as in the case of independently circulating the lower endless chain. No need to power.

In the fifth and sixth aspects, since the lower drive wheel is rotated in synchronization with the rotation of the upper idle wheel, the rotational force is stably transmitted from the upper idle wheel to the lower drive wheel without loss. Therefore, it is possible to suppress the occurrence of vibration of the upper idle wheel and the lower drive wheel.

In the present invention, since the solidified material discharge port for supplying the solidified material liquid through the cutter post is formed in any part of the lower cutter post, the depth of the lower cutter post can be reached in the ground only by the traverse of the building device. A continuous wall can be built.

According to the eighth aspect, since the upper cutter post is supported so as to be vertically movable along the mast supported by the base of the base machine, it is possible to change the depth of digging and the depth of ground improvement for each construction section.

[Brief description of drawings]

FIG. 1 is an elevational view showing how a continuous underground wall is built by a building device mounted on a base machine.

FIG. 2 is a side view of FIG.

3 (a) and 3 (b) are enlarged views of a broken line circle portion in FIG.

FIG. 4 is a side view of FIG. 1 showing a relationship between a hollow excavation portion and a ground improvement portion.

FIG. 5 is an elevational view showing the prior art.

FIG. 6 is an elevational view showing another conventional technique.

[Explanation of symbols]

1 ... Construction device, 2 ... Upper cutter post, 2a ... Cutter post material, 3 ... Upper drive wheel, 4 ... Upper idle wheel, 4a ... Shaft, 5 ... Upper endless chain, 6 ... Excavation Blade, 7 ... Lower cutter post, 8 ... Lower drive wheel, 9
…… Lower idle wheel, 10 …… Lower endless chain, 11 ……
Drilling blade, 12 ... Base machine, 13 ... Stand, 14 ... Mast, 15 ... Hydraulic cylinder, 16 ... Traveling device, 17 ... Upper cutter post passage, 18 ... Lower cutter post passage, 19 ...... Solidification material discharge port, 20 ...... vacant dug portion, 21 ...... Underground continuous wall,

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Amami Kami             6-13-7 Akasaka, Minato-ku, Tokyo Co., Ltd.             In Tenox (72) Inventor Koichi Gunji             6-13-7 Akasaka, Minato-ku, Tokyo Co., Ltd.             In Tenox F term (reference) 2D040 AB05 BD05 CB03 EA01 EA02                 2D049 EA05 GA15 GB01

Claims (9)

[Claims] 1. An upper cutter post having an upper drive wheel and an upper idle wheel at an upper end portion and a lower end portion, respectively, and an upper endless chain having an excavating blade stretched between the upper drive wheel and the upper idle wheel, and an upper portion. It is supported by being connected to the cutter post in the depth direction, has a lower drive wheel and a lower idle wheel at the upper end and the lower end, respectively, and a lower endless chain having a drilling blade is stretched between the lower drive wheel and the lower idle wheel. A device for constructing an underground continuous wall with an empty dug section consisting of a lower cutter post. 2. The upper cutter post is composed of two cutter post members arranged in parallel in the thickness direction, and each cutter post member has an upper drive wheel, an upper idle wheel, and an upper endless chain, and each cutter post member. The construction of an underground continuous wall with a hollow excavation part according to claim 1, wherein the upper drive wheels of the post material rotate in synchronization, and the lower cutter post is supported by being sandwiched between both cutter post materials of the upper cutter post. apparatus. 3. An apparatus for constructing an underground continuous wall with a hollow excavation portion according to claim 1 or 2, wherein the upper endless chain and the lower endless chain respectively circulate as the upper drive wheel of the upper cutter post rotates. 4. The lower drive wheel of the lower cutter post rotates as the upper idle wheel of the upper cutter post rotates, and the lower endless chain of the lower cutter post circulates as the lower drive wheel rotates. A device for constructing an underground continuous wall with an empty dug part. 5. The apparatus for constructing an underground continuous wall with a hollow part according to claim 2, wherein the lower drive wheel of the lower cutter post rotates in synchronization with the rotation of the upper idle wheel of the upper cutter post. 6. The apparatus for constructing an underground continuous wall with a hollow portion according to claim 5, wherein the axis of the lower drive wheel of the lower cutter post and the axis of the upper idle wheel of the upper cutter post are coaxial. 7. The apparatus for constructing an underground continuous wall with a hollowed part according to claim 1, wherein a solidified material discharge port is formed in any part of the lower cutter post. 8. The upper cutter post is movable up and down along the mast supported by the base machine frame.
A construction device for an underground continuous wall with an empty dug part according to any one of claims 7 to 10. 9. The construction apparatus according to claim 1, wherein the upper endless chain is circulated around the upper cutter post and the lower endless chain is supplied while supplying the solidifying material liquid to the ground. While circulating the chain around the lower cutter post, let the lower cutter post and the upper cutter post traverse while inserting in the ground, empty the ground in the section of the upper cutter post, and excavate soil in the section of the lower cutter post. A method for constructing an underground continuous wall with a hollow section by stirring and mixing solidifying material liquid to construct an underground continuous wall with improved ground.