JP3672264B2 - Jet grout method - Google Patents

Description

[0001]
[Industrial application fields]
In the present invention, a pipe is inserted into a guide hole drilled in the ground, and a jet is ejected from a jet nozzle provided at an end while the pipe is rotated and pulled out, and a ground is cut and defined. The present invention relates to a jet grout method for building a solidified body by filling a solidified material from a solidified material nozzle provided in a space in the space between the jet nozzles.
[0002]
[Prior art]
Such a jet grouting method is performed not only in the case of building a solid body extending in the vertical direction but also in the case of building the solid body in the horizontal direction. FIG. 11 shows a jet grouting method for building in the horizontal direction.
[0003]
In FIG. 11, a guide hole 2 is drilled horizontally in the natural ground 1, and a pipe 3 is inserted into the guide hole 2. Alternatively, the jet 5 (with water surrounded by air) is ejected and the ground 1 is cut. Then, if the caulking material 8 is filled into the void 6 defined by cutting from the caulking material nozzle 7 provided at a necessary length L from the jet nozzle 4, the caulking space 6 (horizontal A solidified body 9 is built (extending in the direction). Such a jet grouting method in the horizontal direction is known.
[0004]
[Problems to be solved by the invention]
However, in the above construction method, as shown in FIG. 12, the side surface portions 6a and 6a and the surrounding portion 6b of the space 6 may collapse. As a result, as shown in FIG. 13, the unfilled portion B due to the collapsed earth and sand A remains in the upper portion of the consolidated body 9, and the quality of the consolidated body 6 is deteriorated.
[0005]
On the other hand, if the length L between the nozzles 4 and 7 is reduced to prevent the collapse, the consolidated material 8 is pulled by the air of the jet 5 and discharged as a slurry. There is a problem that it becomes useless and costly.
[0006]
On the other hand, when the length L is increased, the side portions 6a and 6a and the surrounding portion 6b are collapsed as described above before the consolidated material 8 is filled.
[0007]
The present invention has been proposed in view of the above-described prior art, and an object of the present invention is to provide a jet grout method that improves the quality of a consolidated body and eliminates waste of the consolidated material.
[0008]
[Means for Solving the Problems]
According to the jet grouting method of the present invention, a pipe (10) is inserted into a guide hole (2) drilled in the ground, and the pipe (10) is rotated and pulled out from a jet nozzle (4) provided at an end. The jet (5) is ejected to cut the natural ground (1), and from the consolidated material nozzle (11) provided in the space (6) defined by the cutting at an interval from the jet nozzle (4). In the jet grout method for filling the consolidated material (12) to build the consolidated body (13), the guide hole (2) is drilled in the horizontal direction, and the jet (5) from the jet nozzle (4). The solidified material (12) made of a self-supporting material is injected and filled from the rotating solidified material nozzle (11) into the space (6) defined by ), And each of the columnar consolidated bodies (13) is a phase. It is characterized by being construction at intervals.
[0009]
Here, in the present specification, the term “horizontal direction” indicating the drilling direction of the guide hole is meant to include those slightly inclined from the horizontal (the elevation angle with respect to the horizontal plane is within ± 30 °). This is the wording used.
[0010]
Further, the self-supporting material is preferably a material having a small fluidity and a small so-called “slump” such as mortar, concrete, and cement slurry (particularly concrete).
[0012]
Further, according to the present invention, the pipe (10) is inserted into the guide hole (2) drilled in the ground, and the jet (4) provided at the end is jetted from the pipe (10) while being rotated and pulled out. (5) is ejected and the ground (1) is cut, and the solid material nozzle (11) provided in the space (6) defined by the cutting is spaced from the jet nozzle (4). In the jet grouting method in which the binder (12) is filled to build the solidified body (13), the guide hole (2) is drilled in the horizontal direction, and the jet (5) from the jet nozzle (4) A solidified material (12) made of a self-supporting material is sprayed and filled into the defined void (6) from the rotating solidified material nozzle (11) to form a plurality of columnar consolidated bodies (13). The columnar consolidated body (12) by the self-supporting consolidated material (12) 3) the normal caking material and the columnar Katayuitai (9) by (8) is characterized in that it is construction in a state where adjacent.
[0013]
In carrying out the present invention, the consolidated body is formed into a so-called “columnar consolidated body” having a cylindrical shape.
[0014]
[Action]
According to the jet grouting method of the present invention configured as described above, since the consolidated material is poor in fluidity to the extent that it can stand on its own, even if the length between the jet nozzle and the consolidated material nozzle is reduced, The consolidated material supplied from the consolidated material nozzle is not pulled by the air sprayed from the jet nozzle, and is prevented from being discharged from the guide hole as slurry.
[0015]
Since the length between the jet nozzle and the binder nozzle can be reduced, the filler is injected and filled faster than the cavity excavated by the jet injected from the jet nozzle collapses. It is possible to build a high-quality solid body without any unfilled parts.
[0016]
In the present invention, if the consolidated bodies are built at intervals, not only the consolidated body is built from the back side of the guide hole toward the front side, but also from the front side of the guide hole toward the back side. It is possible to build, or build the back side after building the front side from a predetermined location, or vice versa. That is, according to the situation of a construction site, the order of solidified body construction can be arranged freely.
[0017]
Furthermore, in the present invention, if a solidified body made of a normal consolidated material and a consolidated body made of a self-supporting consolidated material are built in a state where they are adjacent to each other, Then, when the unimproved part in the meantime is improved with a normal caking material, the above-mentioned problem does not occur because the building location by the self-standing caking body does not collapse.
[0018]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. In the illustrated embodiment, a cylindrical columnar consolidated body is constructed.
[0019]
1 and 2 show an apparatus for carrying out the present invention. In the figure, the end of the pipe 10 is provided with a jet nozzle 4 and three consolidating material nozzles 11 in the illustrated example with a necessary minimum length L1. The length L1 is significantly smaller than the conventional length L1.
[0020]
The binder nozzle 11 is provided directly on the outer periphery of the tip of the pipe 10 and is a self-standing material from a concrete pump (not shown), for example, a binder 12 of a small slump material such as mortar, concrete or cement slurry. , Is supposed to spout. As shown in FIG. 3, the binder nozzles 11 are arranged so as to be orthogonal to the tip of the pipe 10a, or as shown in FIG. 4, a plurality of the binder nozzles 11 are provided in parallel to the axis at the tip of the pipe 10b. Can do.
[0021]
Next, the aspect of construction will be described.
(1) Guide hole drilling process (Figure 5)
With a boring machine (not shown), a guide hole 2 is drilled in the horizontal direction (as described above, used in the sense that the elevation angle with respect to the horizontal plane includes a range of ± 30 °).
[0022]
(2) Pipe insertion and jet cutting process (Fig. 6)
After inserting the pipe 10 into the guide hole 2, the jet 5 is ejected from the jet nozzle 4 while cutting the ground 1 while rotating and pulling the pipe 10.
[0023]
(3) Cutting and filling material filling process (FIG. 7)
In the step (2), the ground is excavated by the jet 4 and simultaneously, the void 6 defined by cutting is filled with the consolidation material 12 from the consolidation material nozzle 11. Here, since the consolidated material 12 is a self-supporting material such as concrete, it is not pulled by the jet 4 or the air surrounding it.
[0024]
(4) Columnar consolidated structure process (Fig. 8)
The void 6 is filled with the consolidated material 12, and the construction of the consolidated body 13 is completed.
[0025]
Therefore, before the wall surface of the void 6 collapses, the consolidated material 12 is filled, and the quality of the consolidated body 13 can be improved by eliminating the unfilled portion B (FIG. 13). Further, as described in the above step (3), since the discharge amount of the consolidated material 12 becomes extremely small, the waste of the consolidated material 12 can be prevented.
[0026]
FIG. 9 shows an embodiment of the present invention, in which the solid bodies 13 are constructed on the natural ground 1 at intervals, and the number of the solid bodies 13 is reduced according to the properties of the natural ground 1 to reduce the construction cost. This is a reduced example. In addition, in this Example, it can construct arbitrarily from the left or right side in a figure.
[0027]
FIG. 10 shows another embodiment of the present invention, which is an example in which a solidified body 13 made of a self-standing solidified material 12 and a solidified body 9 are connected to each other by a normal solidified material 8. Also in this embodiment, the construction cost can be reduced according to the properties of the natural ground 1. In this example as well, it can be arbitrarily constructed from the left or right side in the figure.
[0028]
【The invention's effect】
Since the present invention is configured as described above, in the construction of the horizontal direction (including the range where the elevation angle with respect to the horizontal plane is ± 30 °), the collapse of the natural ground is eliminated, Quality can be improved. In addition, waste of the consolidated material can be eliminated and waste can be eliminated.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a natural mountain showing an example of an apparatus for carrying out the present invention.
FIG. 2 is a view showing the binder nozzle of FIG. 1;
FIG. 3 is a side view showing an example of a binder nozzle example.
FIG. 4 is a side view showing an example of an example of a binder nozzle.
FIG. 5 is a vertical cross-sectional view of a natural mountain for explaining a guide hole drilling step.
FIG. 6 is a vertical cross-sectional view of a natural ground for explaining a pipe insertion and a cutting process using a jet.
FIG. 7 is a vertical cross-sectional view of a natural ground explaining a cutting and filling material filling step.
FIG. 8 is a vertical cross-sectional view of a natural mountain for explaining a consolidated body construction process.
FIG. 9 is a vertical cross-sectional view of a natural mountain showing another embodiment of the present invention.
FIG. 10 is a vertical cross-sectional view of a natural mountain showing another embodiment of the present invention.
FIG. 11 is a vertical cross-sectional view of a natural ground for explaining a conventional construction mode.
12 is a vertical cross-sectional view of a natural mountain explaining the collapse of the void in FIG.
13 is a vertical cross-sectional view of a natural mountain for explaining a defect of the consolidated body according to FIG. 11;
[Explanation of symbols]
A ... Collapsed sediment B ... Unfilled part 1 ... Ground 2 ... Guide holes 3, 10, 10a, 10b ... Pipe 4 ... Jet nozzle 5 ... Jet 6 ...・ Voids 7, 11 ... Consolidating material nozzles 8,12 ... Consolidating materials 9, 13 ... Consolidated body

Claims (2)

  The pipe (10) is inserted into the guide hole (2) drilled in the ground, and the jet (5) is ejected from the jet nozzle (4) provided at the end while the pipe (10) is rotated and pulled out. The pile (1) is cut, and the void (6) defined by the cutting is filled with the consolidation material (12) from the consolidation material nozzle (11) spaced from the jet nozzle (4). In the jet grouting method for constructing the solidified body (13), the guide hole (2) is drilled in the horizontal direction, and a void defined by the jet (5) from the jet nozzle (4) ( 6), a solidified material (12) made of a self-supporting material is injected and filled from the rotating solidified material nozzle (11) to form a plurality of columnar consolidated bodies (13). Each of the bodies (13) should be built at a distance from each other Jet grouting method to the symptoms.   The pipe (10) is inserted into the guide hole (2) drilled in the ground, and the jet (5) is ejected from the jet nozzle (4) provided at the end while the pipe (10) is rotated and pulled out. The pile (1) is cut, and the void (6) defined by the cutting is filled with the consolidation material (12) from the consolidation material nozzle (11) spaced from the jet nozzle (4). In the jet grouting method for constructing the solidified body (13), the guide hole (2) is drilled in the horizontal direction, and a void defined by the jet (5) from the jet nozzle (4) ( 6) A solidified material (12) made of a self-supporting material is injected and filled from the rotating solidified material nozzle (11), and a plurality of columnar consolidated bodies (13) are built and the self-supported. Columnar consolidated body (13) and ordinary consolidated material by consolidated material (12) Jet grouting construction method characterized in that it is construction in a state where the columnar Katayuitai (9) adjacent with 8).

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