JP5185084B2 - Ground improvement method - Google Patents

Description

  The present invention relates to a method for continuously improving the ground in an oblique or horizontal direction by non-cutting, and more particularly, to a ground improving method capable of making the ground space to be used as small as possible.

When the ground is soft, there are various methods to improve the ground, such as inserting a stirring blade with a heavy machine into the ground and kneading the solidified material, or injecting the ground improving material into the ground with high pressure and solidifying it. Has been developed.
These ground improvement methods require a large space and work space on the ground to insert a stirring blade into the ground with a heavy machine to knead the solidified material or to inject the high pressure.
Therefore, if there were existing buildings and roads, they could not be constructed unless they were largely removed to secure space.
Moreover, it specializes in the improvement in the vertical direction, and is unsuitable for continuous improvement in an oblique or horizontal direction.

The MJS method, parajet method, and lateral jet method have been developed as non-open-cutting ground improvement methods that minimize the ground usage space as much as possible, but these methods have developed the vertical injection improvement technology in the horizontal direction. The propulsion unit does not have an excavation device that independently rotates and excavates. Instead, the propulsion unit grips the root of the propulsion pipe connected to the propulsion unit and rotates the propulsion unit to rotate the tip propulsion unit.
Therefore, the torque for rotating the propulsion pipe and the propulsion unit becomes extremely large, and it is usually impossible to perform curved construction, and the improved depth is considered to be about 40 m at the most, and the quality of position accuracy, thickness, strength, etc. is also limited. was there.
On the other hand, as one of the injection methods, there was also a technology that enabled additional improvement of the tank foundation using free boring, but that method was only a solution-type injection method that did not require wastewater treatment. It was.
In short, sludge treatment and pressure control are indispensable for ensuring the quality of horizontal injection improvement, and the conventional technology that solves this part is limited to the horizontal improvement of vertical boring injection improvement technology. At present, the sludge treatment and pressure control are insufficient.
That is, the prior art is based on the assumption of straight pipes such as boring, and cannot cope with ground improvement in the case of curves, long distances exceeding 100 m, and hydraulic conditions.

The invention described in Japanese Patent Application Laid-Open No. 2008-25175, in order to secure a parking space or the like adjacent to an existing tunnel, start a propulsion device from the tunnel and propel it to the side of the tunnel so as to draw an arc. The latter is connected with a propulsion pipe and promoted.
The propulsion device includes a digging device at the tip, and the digging device at the tip rotates to excavate the ground.
After the propulsion unit returns to the tunnel, the propulsion pipe is pulled out, and an improvement material such as cement milk is sprayed from the injection improvement device installed in the propulsion unit toward the ground, and the ground along the propulsion direction of the propulsion unit Is to improve.
Propulsion by this propulsion machine and injection of improvement material from the injection improvement device are performed in parallel to form a cross-section arc-shaped space continuous to the side of the tunnel, and the inside is excavated and used for parking space etc. Is.

In the method according to the above-mentioned publication, the ground is improved only by mixing with a simple ground with an improved material, the strength as a structure is not sufficient, and the double that is an extension of the boring method By the improvement of the ground with the pipe, it was intended to receive the earth retaining from the tunnel mine, and only about 20m of excavation was supposed.
In addition, because it is a double pipe, it is not possible to provide a cage that appears and disappears by a cylinder on the outer periphery of the propulsion unit or the propulsion pipe, or a pipe bending mechanism, and the propulsion route is determined by the propulsion direction of the first propulsion unit As a result, the propulsion direction could not be corrected on the way, and long-distance propulsion could not be performed accurately.
In addition, since there is no sludge path such as a sludge adjusting device or a sludge pipe, pressure control is not possible, so the ground improvement of the outer surface of the pipe is locally improved for improvement by simple mixing with the ground improvement material. Although it could be done, it was impossible to improve the ground, which could guarantee strength and range.
In particular, when excavating along the improved ground to form a tunnel space, etc., it is not possible to obtain a uniform and high-strength ground lining body if only the improved ground by simple mixing with the improved material is used. It was enough.
In the case of a curved line shape that does not depend on the invention described in the above publication, pipe roof construction has been adopted in order to obtain the lining body, but subsequent ground freezing between the pipe roofs is indispensable, and this is a large work load. The construction period was prolonged.

When cutting and improving natural grounds with high-pressure jet water, air, or improved materials, the conventional vertical improvement allows drainage of lighter specific gravity to escape in the vertical direction. There is no inconvenience if not.
On the other hand, in the case of improvement in the horizontal direction, this effect does not exist, so when air is interposed in the high-pressure jet water, if there is no mud path that can maintain pressure, the collapse of the natural ground in the air reservoir and the occurrence of insufficient strength Improved quality cannot be ensured.
In addition, when the high-pressure jet water is in the horizontal direction with water only, the solidified material will be separately filled. This area is free of ground improvement material, and cannot be improved without a mud discharge route. Even in this case, it is considered that securing a sludge path is indispensable in order to create an improved body that can ensure strength.
JP 2008-25175 A

  The problem to be solved is to reduce the necessary ground space as much as possible, to increase the rigidity as improved ground, and to shorten the construction period.

The ground improvement method according to the present invention starts a propulsion device that excavates the ground from the start space,
A propulsion unit is connected to the rear of the propulsion unit for propulsion, and in the ground improvement method for improving the ground by the injection improvement device along the propulsion direction of the propulsion unit, the excavation device, the injection improvement device, and the waste mud adjustment device are provided. The propulsion machine is propelled from the starting space to the ground, excavated by excavation rotation of the excavation device, and after that, the propulsion pipe is pushed by the jack to excavate the ground at a desired distance, and then the jack is pulled out from the ground by the jack, and finally The ground improvement material is sprayed and filled from the injection improvement device located at the tail toward the ground, and the mud is discharged through the drainage pipe of the drainage adjustment device to improve the ground.
Another ground improvement method according to the present invention is to start a propulsion device that excavates the ground from the start space, and to propel the propulsion unit by connecting a propulsion pipe to the rear of the propulsion unit. In the ground improvement method for improving the ground by the device, a propulsion device equipped with a digging device is propelled from the starting space to the ground, digging by the digging rotation of the digging device, and then the propulsion pipe is pushed by a jack to reach the arrival space. Pull out the propulsion pipe from the ground with a jack, spray and fill the ground improvement material from the injection improvement device located at the tail end of the propulsion pipe toward the ground, and also adjust the waste mud located at the tail end of the propulsion pipe Mud is discharged through the device's mud pipe to improve the ground along the propulsion unit's propulsion path.
Another ground improvement method according to the present invention is to start a propulsion device that excavates the ground from the start space, and to propel the propulsion unit by connecting a propulsion pipe to the rear of the propulsion unit. In the ground improvement method that improves the ground with the device, the propulsion device equipped with the excavation device is propelled from the start space to the ground, and the excavator rotates through the excavation rotation, and then the jack is propelled by the jack to reach the arrival space. Pull out the propelling pipe from the ground with a jack, inject the ground improvement material from the injection improving device located at the tail toward the ground, and adjust the pressure through the mud pipe of the mud adjusting device located at the tail. The mud is discharged and the ground is improved along the propulsion path of the propulsion unit, and after the injection improving device, the shape steel and the steel pipe are propelled by the jack and embedded in the ground.
In another ground improvement method according to the present invention, the improved ground portions are arranged side by side to be continuous in a cross-sectional arch shape, a cross-sectional square shape, a circular cross-sectional shape, or an annular shape, and a shaped steel or a steel pipe is arranged in the improved ground.
In another ground improvement method according to the present invention, the injection improving device has an improvement material injection port rotatable around the propulsion unit traveling direction as an axis.
In another ground improvement method according to the present invention, two injection improvement devices are provided close to each other while maintaining a certain separation, and the improvement material and high-pressure water injected from the two injection improvement devices are disposed on the outer periphery of the propulsion unit. The cutting range is limited by intersecting at the part.
In another ground improvement method according to the present invention, the jet improvement device has a blade opening that can be stirred and rotated behind the cutting direction in the cutting range, and can be improved more uniformly.

The present invention is configured as described above, and can achieve at least one of the following effects.
<a> A start space and a reaching space are provided in one of them, and the propulsion unit and the propulsion pipe are propelled into the ground from the space. Therefore, the ground space to be used may be very small, and an existing building or structure can be used. The part to be removed or dismantled can be made as small as possible, and the occurrence of traffic jams can be alleviated.
<B> Since the propulsion device is a mechanism in which the excavation device itself provided at the tip rotates and excavates, the excavator automatically excavates without rotating the subsequent propulsion pipe. Is also possible.
In addition, since the propulsion unit and the propulsion pipe are single pipes, it is possible to provide a folding mechanism or a heel posture control mechanism that can be projected and retracted in the outer circumferential direction, thereby enabling more accurate propulsion.
<C> In order to inject and fill the improvement material and jet water on the ground by moving the injection improvement device while pulling out the propulsion pipe along the propulsion direction of the propulsion unit, if the propulsion pipe processed with a curve is used, the curve Ground improvement is also possible.
Moreover, if it is a gentle S-shaped curve, the same ground improvement is possible by joining a socket-type steel pipe.
<D> By disposing a core material such as a shape steel or a steel pipe in the improved ground, the improved ground becomes more rigid, and the improved ground can be used sufficiently as a padding lining body. It can also be used as an alternative to ground improvement by freezing, which has been performed between curved pipe roofs.
<E> The injection improvement device is not a shaft rotation type that uses the vertical injection improvement technology such as MJS method, parajet method, lateral jet method, etc. Since the improved material injection port is rotatable, so to speak, it is a ring-shaped rotary type, so that it is possible to perform curved construction that cannot be rotated by the shaft.
<F> The injection improving devices are provided in close proximity to each other, and the cutting range is set by intersecting the improved material and high-pressure water injected from the two sets of injection improving devices at the outer periphery of the propulsion unit. It is possible to limit. Moreover, cutting efficiency can be easily increased by installing two or more sets of two sets of injection improving devices.
Even if the mud thus cut does not meet the injection line, it can be discharged through the mud pipe of the mud adjusting device through the peripheral surface, and therefore, ground improvement with low energy loss and good cutting efficiency is possible.
In the case of the conventional shaft rotary type, the waste mud always meets one of the injection lines, where energy loss increases and cutting efficiency is not good. In addition, only one set of the same injection line can be usually installed, and there is a limit to increasing the cutting efficiency.
Note that the phenomenon of energy loss due to crossing of injection lines is a well-known fact in natural science.
In the present invention, this effect is obtained by performing this so that the injection lines (on the surface not including the coaxial core) injected from two or more injection improving devices on the peripheral surface intersect.
<G> By disposing a sludge adjusting device and a sludge pipe that can hold pressure in the propulsion pipe, mud in the ground can be discharged through the sludge pipe without causing a pressure drop in the ground. It is possible to improve the accuracy of the injection improvement without loosening the ground.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
<1> Start Space As a start space that digs into the ground 1, various things such as a resisting wall 2, a tunnel, and a cut groove can be adopted.
FIG. 1 and FIG. 2 show a case where the resistance 2 is used as a starting space.
A concrete wall 3 is formed on the inner wall of the resisting wall 2.
If necessary, the ground around the resisting wall 2 may be improved along the concrete wall 3.

<2> Propulsion machine FIG. 3 and FIG. 4 show a propulsion machine 4 provided with an excavation mechanism 4a having a plurality of bits at the tip, together with an injection improving device 5 and a pressure retaining mud adjusting device. In preparation.
The injection improvement device 5 is a device that injects and fills ground improvement material, water, and the like at high pressure. The injection port 6 that rotates around the propulsion direction of the propulsion unit 4 and the center of the tip of the propulsion unit Has a filling port 20.
The sludge adjustment device prevents the measured value of the earth pressure gauge provided on the outer periphery of the propulsion unit 4 from being below the required pressure, and discharges slime, etc. discharged due to improved injection without loosening the ground. It has a pressure adjustment device such as an openable and closable type, and is provided at a downstream position of the jet improvement device 5.
The injection improving device 5 is not necessarily provided integrally with the propulsion unit 4 and may be attached to the propulsion pipe 7 independently of the propulsion unit 4 as described later.

<3> Propulsion pipe The propulsion pipe 7 is arranged and connected to the rear of the propulsion unit 4 so that the necessary number is added.
For the connection between the propulsion unit 4 and the propulsion pipe 7 or the connection between the propulsion pipes 7, various means such as a connection using bolts and nuts, or a connection using welding can be adopted.
Inside the propulsion pipe 7, there is a mud pipe 19 for discharging mud and water, and it is possible to discharge mud and water in the ground to the starting space and the arrival space due to the injection improvement. It has become.

<4> Propulsion The excavator 4 is excavated and propelled horizontally from the hole opened in the resist 2.
The propulsion device 4 is digged with its own excavation mechanism rotating independently.
Further, the propulsion unit 4 has a middle bend and also has a saddle posture control mechanism, and realizes long-distance excavation and accuracy of excavation.
The propulsion pipe 7 is subsequently connected to the rear side thereof, and is continuously propelled by a jack 8 for both propulsion and extraction.

<5> Pulling out After propelling for a desired distance, the propelling pipe 7 is pulled out from the ground 1 by the jack 8.
At the same time, while rotating the injection port 6 from the injection port 6 of the injection improvement device 5 to the ground improvement material P such as cement milk, mortar, underwater non-separation mortar or high pressure jet water, or both, toward the periphery of the excavation part. Injecting, filling, and filling the ground improvement material P from the filling port 20 in the same way, adjusting by the drainage adjusting device so that the surrounding earth pressure does not become lower than necessary, and discharging through the drainage pipe 19, An improved ground portion A is formed by improvement.
In other words, while returning to the resistance 2 side of the propelled path, the ground improvement material is injected and filled from the injection improvement device 5 located at the end when returning, and the ground improvement material P is also filled from the filling port 20. Then, the surrounding ground 1 will be improved.
Simultaneously with the injection, mud such as mud and water in the ground 1 is discharged into the resister 2 through the mud adjusting device and the mud pipe arranged in the propulsion pipe 7 and further to the ground.
By discharging the mud and water, the ground improvement material P enters the surrounding ground 1 satisfactorily, and the improvement accuracy in diameter and strength is improved.

<6> Restriction of improvement depth In the embodiment, two sets of cylindrical injection improvement devices 5 are attached to the propulsion unit 4 in close proximity and in parallel, and the injection improvement device 5 sets the injection ports 6 in the directions of each other. Across the injection line. (Fig. 5)
By crossing the improvement material P and the high-pressure water injected from the two injection improvement devices 5 at the outer peripheral portion of the propulsion device, the injection pressure is offset and the cutting range can be limited.

<7> Withdrawal of propulsion pipe and propulsion unit The propulsion pipe 7 pulled out into the rifle 2 is disconnected and withdrawn to the ground.
Finally, the propulsion device 4 is also pulled out into the battling 2 and withdrawn.
By repeating such work, the ground 1 is improved in parallel from the ground 2 and the ground such as the existing facility ground is improved.

<8> Start Space and Arrival Space FIGS. 6 to 8 show a second embodiment of the present invention, which has a reaction 2 as a start space and a resistance 9 as an arrival space. .
The propulsion unit 4 and the propulsion pipe 7 are excavated and propelled by the method described above from the counter 2.
The propulsion device 4 in this embodiment does not include the injection improving device 5.
The injection improving device 5 is attached further behind the last propelling pipe 7.
After the propulsion unit 4 reaches the resistance 9, the propulsion unit 4 and the propulsion pipe 7 are pulled out from the ground 1 by the jack 10 for pulling out.
The injection improving device 5 located at the tail end of the propulsion pipe 7 is operated to inject the ground improvement material and / or the high-pressure jet water from the injection port 6 toward the surrounding ground, and are arranged inside the propulsion pipe 7. The mud and moisture are discharged into the resister 9 on the arrival side and further to the ground through the drainage pipe 19.
If the last propulsion pipe 7 and the injection improving device 5 are extracted into the resister 9 and removed, the surrounding ground 1 is improved along the propulsion path. In this case, the ground improvement material may be supplementarily filled from the resistance 2.

<9> Core Material FIGS. 9 to 12 employ a procedure for arranging the core material 11 for reinforcement in the improved ground.
The procedure up to excavation and propulsion is the same as that shown in FIGS. 6 to 8, but the core material 11 continues from the starting side resist 2 to the injection improving device 5 following the withdrawal of the propulsion unit 4 and the propulsion pipe 7. The shape steel and the steel pipe are pushed in the propulsion direction.
As the core material 11, members having various shapes such as a known shape steel such as an H-shaped steel and an I-shaped steel, a cylindrical steel pipe, and a square steel pipe can be widely used.
The core material 11 is pushed into the ground 1 by adding a necessary number of wires by welding or the like.

<10> Folding Improvement FIGS. 13 to 16 show a case where excavation propulsion is performed from the starting resistance 2 toward the reaching resistance 9, and after reaching the resistance 9, it returns toward the resistance 2. Thus, the propulsion pipe 7 is pulled out.
In the case of this embodiment, the propulsion unit 4 which is the last at the time of pulling out is integrally provided with a jet improving device 5, pulls out the propelling pipe 7, and jets the improving material from the jet improving device 5 to the surrounding ground 1. Then, mud and water are discharged into the resister 9 through the drainage pipe 19 inside the propulsion pipe 7.
Subsequent to the improvement of the ground 1, the core material 11 is pushed from the stand 9 by the pushing jack 12.

<11> Construction of Arch Culvert FIGS. 17 to 19 show a case where an arch culvert is constructed by using the ground improvement method according to the present invention in a curved line pipe roof tip receiving method.
Conventional pipe roof tip receiving methods usually use linear alignments that can cross sections, but in the case of curved alignments, they cannot cross sections. For this reason, a freezing method or the like was adopted, which pressed down the cost and caused a delay in the construction period. According to the present invention, this freezing method can be replaced with ground improvement, and the construction period can be shortened.
First, the curved pipe roof 21 is separately installed with a certain distance by a propulsion unit, and then the propulsion unit 4 is excavated and propelled from the stand 2 to the stand 9 using the above-described means, and then the propulsion pipe 7 to improve the ground while pulling out.
In this embodiment, a curve is propelled, and the propulsion pipe 7 is formed in a curve so as to draw a predetermined curve.
After the propulsion unit 4 reaches the resistance 9, while pulling out the propulsion pipe 7, the ground improvement material and / or high-pressure jet water or both are ejected from the injection improvement device 5 toward the ground 1 around the propulsion direction. Improve.
Since the injection improving device 5 ejects the improved material such that the injection port 6 rotates on the peripheral surface of the propulsion device 4, the improved material can be ejected in a curved line.
In this way, a plurality of parallel pipe roofs 21 are separately arranged at appropriate intervals so as to form a cross-sectional arch shape by a separate propulsion device, and an improved reinforced ground portion A including the pipe roof 21 is provided. It becomes the receiving lining body.
The arch culvert is constructed by excavating under the above-mentioned receiving lining body and arranging the segments 14.
In the figure, reference numeral 15 denotes a ground portion improved along the inner walls of the ridges 2 and 9.

<12> Construction of Shield Starting Space FIGS. 20 and 21 show that, after excavating one relatively small diameter resisting 16, the present invention is implemented using the resisting 16 as a starting and reaching space, and shield excavation is performed. This is an example in which the start space of the machine 17 is constructed.
In this case, the resist 16 is both a start space and an arrival space.
The stand 16 has a diameter of, for example, a sidewalk portion. From the stand 16, the propulsion unit 4 and then the propulsion pipe 7 are excavated and propelled on the ground 1 in a curved line, and then the ground improvement material or high pressure The circular ground improvement is started by starting from the stand 16 and returning to the stand 16 by jetting the jet water or both.
Such ground improvement is formed in a plurality of stages in parallel in the vertical direction, and the ground improvement is performed so that the horizontal section is annular.
Following the ground improvement, the curved core material 11 is pushed in and reinforced.
Thereafter, the inside surrounded by the improved ground portion A is excavated to form a starting space for the shield machine 17 having a large cross section.
By using only a part of the sidewalk part, it is possible to construct a large cross-section resistance under the road that can expect arch action under the road, compared to the conventional continuous wall construction method that uses heavy equipment from the ground. The resulting traffic congestion can be alleviated.

<13> Tunnel Construction FIGS. 22 to 28 show examples in which the present invention is implemented for tunnel construction.
Although the ground improvement is performed from the resisting 2 to the resisting 9 in the same manner as the above-described embodiment, a plurality of ground improvement is performed in parallel as shown in FIGS. And the ground improvement part A draws a circular cross section.
Further, in the improved ground portion A, the core 11 is pushed into the improved portion surrounding the top and left and right sides of the tunnel.
By doing in this way, the arch-shaped part which has arrange | positioned the core material 11 becomes a pre-supporting covering body which can be constructed also on the curve with the high rigidity which can anticipate the arch action effect.
Then, tunnel construction which does not use a shield machine is attained by excavating the inside of the improved ground portion A.

<14> Tunnel Widening Work FIGS. 29 to 32 show an example in which the present invention is implemented in a tunnel widening work.
The propulsion unit 4 used for the tunnel widening work does not include the injection improvement device 5 as in the second embodiment, and the injection improvement device 5 is a type of blade expansion 22 in which the wings expand left and right at the tail end of the propulsion pipe 7. It is installed with the mechanical stirring device.
The propulsion unit 4 is excavated and propelled from the existing or new tunnel 18, and then the propulsion pipe 7 is propelled.
The propulsion pipe 7 has a curved shape, starts from the tunnel 18, curves in a curved direction upward, and propels to draw a path returning to the tunnel 18 again.
After the propulsion device 4 returns to the tunnel 18, the injection improving device 5 is attached to the tail end of the propulsion tube 7, and the propulsion device 4 and then the propulsion tube 7 are pulled out.
The ground improvement material is injected and filled from the injection port 6 of the injection improvement device 5 at the end, and the ground is improved along the propulsion path. In addition, when the ground improvement material P is sprayed and filled from the injection port 6 by providing a mechanical stirring device that can expand the blades behind the injection port 6 of the injection improvement device 5, the ground improvement is performed along the propulsion path. If the wings are expanded and the rear part is stirred, the quality of the improved part can be made more uniform.
Following the ground improvement, the curved core material 11 is pushed in while the propulsion pipe 7 is pulled out, and a ring-shaped improved ground portion A is formed on the side of the tunnel 18.
The ring-shaped improved ground portion A having the core 11 as described above is formed in parallel in the axial direction of the tunnel 18, and the improved ground portion A parallel to the tunnel is formed on the side of the tunnel 18. .
The tunnel 18 is widened by excavating the improved ground portion A as described above.

Construction sequence sectional view of an embodiment of the present invention Construction sequence sectional view of an embodiment of the present invention Front view of injection improvement device Side view of the jet improvement device Front view of the state where two injection devices are brought close to each other Construction sequence sectional view of another embodiment of the present invention Construction sequence sectional view of another embodiment of the present invention Construction sequence sectional view of another embodiment of the present invention Construction sequence sectional view of another embodiment of the present invention Construction sequence sectional view of another embodiment of the present invention Construction sequence sectional view of another embodiment of the present invention Construction sequence sectional view of another embodiment of the present invention Construction sequence sectional view of another embodiment of the present invention Construction sequence sectional view of another embodiment of the present invention Construction sequence sectional view of another embodiment of the present invention Construction sequence sectional view of another embodiment of the present invention Longitudinal sectional view of an arch culvert constructed by the method of the present invention Cross-sectional view of an arch culvert constructed by the method of the present invention It is a longitudinal cross-sectional view of the state which builds an arch culvert with the method of this invention, Comprising: (a)-(d) shows the construction order. Longitudinal sectional view for constructing a shield start space by the method of the present invention Cross-sectional view of constructing a shield start space by the method of the present invention Longitudinal sectional view for tunnel construction by the method of the present invention The state of tunnel construction by the method of the present invention is shown. (A) is a longitudinal sectional view and (b) is a sectional view taken along the line bb. The state of tunnel construction by the method of the present invention is shown. (A) is a longitudinal sectional view and (b) is a sectional view taken along the line bb. The state of tunnel construction by the method of the present invention is shown. (A) is a longitudinal sectional view and (b) is a sectional view taken along the line bb. The state of tunnel construction by the method of the present invention is shown. (A) is a longitudinal sectional view and (b) is a sectional view taken along the line bb. The state of tunnel construction by the method of the present invention is shown. (A) is a longitudinal sectional view and (b) is a sectional view taken along the line bb. The state of tunnel construction by the method of the present invention is shown. (A) is a longitudinal sectional view and (b) is a sectional view taken along the line bb. FIG. 2 shows a state where the tunnel is widened by the method of the present invention, wherein (a) is a longitudinal sectional view and (b) is a sectional view taken along the line bb. FIG. 2 shows a state where the tunnel is widened by the method of the present invention, wherein (a) is a longitudinal sectional view and (b) is a sectional view taken along the line bb. FIG. 2 shows a state where the tunnel is widened by the method of the present invention, wherein (a) is a longitudinal sectional view and (b) is a sectional view taken along the line bb. FIG. 2 shows a state where the tunnel is widened by the method of the present invention, wherein (a) is a longitudinal sectional view and (b) is a sectional view taken along the line bb. Side view of jet improvement device and blade expansion device used for tunnel widening Front view of FIG.

Explanation of symbols

A: Improved ground part 1: Ground 2: Standing 3: Concrete wall 4: Standing 5: Injection improving device 6: Injection port 7: Propulsion pipe 8: Jack 9: Standing 10: Jack 11: Core material 12: Jack 14: Segment 15: Improved ground part 16: Resistant 17: Shield machine 18: Tunnel 19: Mud pipe 20: Filling port 21: Pipe roof 22: Expanded wing

Claims (7)

Launch a propulsion machine that excavates the ground from the launch space,
Propeller pipes are connected behind the propulsion unit for propulsion,
In the ground improvement method in which the ground is improved by the injection improvement device along the propulsion direction of the propulsion device, the propulsion device including the excavation device, the injection improvement device, and the mud adjustment device is propelled from the start space to the ground, and the excavation rotation of the excavation device is performed. Digging through and
After that, after propelling the propulsion pipe with a jack and excavating the desired distance ground,
Pull out the propelling pipe from the ground with a jack, and spray and fill the ground improvement material from the injection improvement device located at the end toward the ground,
Mud is discharged through the mud pipe of the mud control device and improved ground. Launch a propulsion machine that excavates the ground from the launch space,
Propeller pipes are connected behind the propulsion unit for propulsion,
In the ground improvement method in which the ground is improved by the injection improvement device along the propulsion direction of the propulsion device, the propulsion device including the excavation device is propelled from the start space to the ground, and the excavation device excavates by the excavation rotation.
After that, the propulsion pipe is propelled by jack to reach the arrival space,
Pull out the propulsion pipe from the ground with a jack, and inject and fill the ground improvement material from the injection improvement device located at the end of the propulsion pipe toward the ground,
A ground improvement method that improves the ground along the propulsion path of the propulsion machine by discharging mud through the sludge pipe of the sludge adjusting device located at the end of the propulsion pipe . Launch a propulsion machine that excavates the ground from the launch space,
Propeller pipes are connected behind the propulsion unit for propulsion,
In the ground improvement method in which the ground is improved by the injection improvement device along the propulsion direction of the propulsion device, the propulsion device including the excavation device is propelled from the start space to the ground, and the excavation device excavates by the excavation rotation.
After that, the propulsion pipe is propelled by jack to reach the arrival space,
While pulling out the propelling pipe from the ground with a jack, the ground improvement material is sprayed toward the ground from the injection improvement device located at the end,
Similarly, the mud is discharged through the mud pipe of the mud adjusting device located at the end to improve the ground along the propulsion path of the propulsion machine,
Subsequent to the injection improvement device, a ground improvement method in which a steel bar or steel pipe is propelled by a jack and buried in the ground. The improved ground parts are juxtaposed in a cross-sectional arch shape, a cross-sectional square shape, a circular cross-section shape or an annular shape,
4. The ground improvement method according to claim 3, wherein a shaped steel or a steel pipe is disposed in the improved ground. The ground improvement method according to any one of claims 1 to 4, wherein the injection improving device has an improvement material injection port rotatable around the propulsion unit traveling direction as an axis. The two injection improvement devices are provided close to each other, and the cutting range is limited by intersecting the improved material and high-pressure water injected from the two injection improvement devices at the outer periphery of the propulsion unit. 5. The ground improvement method according to 5. 5. The jet improvement device according to claim 1, further comprising: a blade that can be agitated and rotated around the propulsion unit traveling direction as an axis in a cutting range, and further improves the injection more uniformly. The ground improvement method described.

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