JP2002349181A - Vertical shaft construction machine, construction method for vertical shaft, and shaft working method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method for vertical shaft by use of a vertical shaft construction machine which requires no long pile in the construction of a vertical shaft. SOLUTION: This vertical shaft, construction machine for performing a lining while excavating a vertical shaft comprises a construction machine body having a cylinder for holding the inner surface of the vertical shaft in the tip part of the vertical shaft under excavation, an excavating means provided on the lower end part of the cylinder and an assembling means provided in the upper part of the cylinder to assemble segment to provide an annular earth retaining wall. A boring is preliminarily performed in a position for constructing the vertical shaft, and a reaction receiving member is inserted to the bored hole. This machine further comprises a propulsion means for advancing the construction machine body downward in the excavation by the excavating means by receiving a reaction from the reaction receiving member in the state where the lower end of the reaction receiving member is fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft construction machine for constructing an earth retaining shaft, a shaft construction method using the shaft construction machine, and a deep foundation method.

[0002]

2. Description of the Related Art The deep foundation method has been used for construction in urban areas and construction of bridge foundations on cliffs. The deep foundation method is a method of constructing a pile by digging down circularly with human power, retaining earth with a liner plate or reinforcing ring, burying it as a formwork, arranging reinforcement inside and placing concrete inside. The construction was possible in a small space.
However, in the conventional deep foundation method, manual work is the mainstream, and it is necessary to develop new construction technology by mechanization because of difficult work and safe work in narrow holes and a decrease in the future workforce.

[0003] Therefore, recently, a vertical shield construction method of excavating using a vertical shield machine has been receiving attention. As a vertical shield method, for example, Japanese Unexamined Patent Publication No.
As in the method shown in 5), a pile is driven into the ground to a predetermined depth, a vertical shield machine is provided so as to surround the pile, and the gripping device provided in the shaft construction machine is used to hold the pile. A method has been proposed in which the pile is gripped and the pile is propelled as a reaction force.

[0004]

By the way, in the above-mentioned method, a pile is first driven into a predetermined place in order to receive a reaction force at the time of starting of the shaft construction machine, but a shaft having a large diameter and a large depth is installed. When constructing, a very long pile is required, and a large pile driving machine for driving the pile is required, which is problematic when the construction site is narrow.

[0005] Further, in the case of construction on soft ground, the pull-out drag of the pile may be insufficient as a reaction force when the shield starts.

Accordingly, the present invention relates to a vertical shield machine-like vertical shaft construction machine which does not require a long pile when constructing a vertical shaft in, for example, the construction of a deep foundation pile, and a construction of a vertical shaft using this vertical shaft construction machine. The purpose is to provide a construction method and a deep foundation method.

[0007]

Means for Solving the Problems To solve the above problems, an invention according to claim 1 is a shaft construction machine 1 for retaining earth on the inner wall surface of a shaft while excavating the shaft, A cylindrical body (skin plate 80) for holding the inner surface of the shaft at the tip of the vertical shaft, the excavating means 20 provided at the lower end of the cylindrical body, and the segment 90 provided in the upper part of the cylindrical body. And an assembling means (erector device 70) for providing an annular earth retaining wall, boring is performed in advance at a position where a shaft is to be constructed, and a reaction force receiving member (drill) is provided inside the bored hole. In a state where the pipe 100) is inserted and the lower end of the reaction force receiving material is solidified, a reaction force is taken from the reaction force receiving material and the construction machine body is propelled downward during excavation by the excavating means. Promotion Characterized by comprising a stage.

According to the first aspect of the present invention, boring is performed in advance at a position where a shaft is to be constructed, and a reaction force receiving member is inserted into the bored hole. And, by fixing the lower end portion of the reaction force receiving material and fixing the upper portion of the reaction force receiving material to the construction machine main body, it is possible to take a reaction force for propelling the construction machine main body downward, Excavation can be performed without requiring a large device on the ground as in the related art. Excavation of soft ground will also be possible if the foundation is sufficiently solidified.

According to a second aspect of the present invention, in the vertical shaft construction machine of the first aspect, the reaction force receiving member is a plurality of connected drill pipes, and the drill pipe is provided with the propulsion means 30. A fixing drill pipe 100a to be fixed is provided, and the propulsion means is provided with a fixing portion 33 that is detachably fixed to the fixing drill pipe. An engaging portion 110 is provided at a position to be fixed to the fixing portion, and when the propulsion means sequentially protrudes the construction machine body downward, a drill below the fixing drill pipe is provided. By removing a part of the pipe and connecting the fixing drill pipe to the remaining drill pipe, the fixing drill pipe is moved downward, and the fixing drill pipe is connected to the fixing drill pipe. The continuously connected by fixing a lower end portion, characterized in that the take reaction forces from the root consolidated by drill pipe.

According to the second aspect of the present invention, the same effects as those of the first aspect can be obtained, and by using a drill pipe as a reaction force receiving member, a reaction force can be formed when a deep shaft is constructed. Even if the receiving material becomes long, the reaction force receiving material can be easily handled by connecting and removing the drill pipe. In addition, in the portion of the fixing drill pipe having an engaging portion that engages with the fixing portion of the propulsion means, the propulsion means always takes a reaction force,
The reaction force can be easily obtained from the cylindrical drill pipe.

According to a third aspect of the present invention, there is provided a method for constructing a vertical shaft using the vertical shaft constructing machine according to the first or second aspect of the present invention. A reaction force receiving member setting step of arranging a reaction force receiving material in a state where the lower end portion is solidified in the hole formed,
Then, an excavation step of excavating the lower side of the shaft construction machine while taking a reaction force from the reaction force receiving material and propelling the shaft construction machine downward by a predetermined distance, and then, at the upper side of the shaft construction machine And a soil retaining step of assembling the segments and constructing an annular retaining wall corresponding to the distance excavated in the excavating step, and repeating the excavating step and the earth retaining step to soil to a predetermined depth. It is characterized by forming a shaft in a locked state.

According to the third aspect of the present invention, boring is performed at a position where a shaft is to be constructed in advance by a method of constructing a shaft using a shaft construction machine, and a counterbore in a state where a lower end portion is solidified in a bored hole. A lower portion of the shaft construction machine is excavated while arranging a force receiving material and taking a reaction force from the reaction force receiving material and propelling the construction machine body downward, so that the same configuration as in claim 1 or 2 is adopted. The effect can be achieved.

According to a fourth aspect of the present invention, there is provided a deep foundation method using the vertical shaft construction machine according to the first or second aspect, wherein boring is performed at a position where the vertical shaft is to be constructed, and the boring is performed. A reaction force receiving material placing step of arranging a reaction force receiving material whose lower end is solidified in a hole formed therein, and then taking a reaction force from the reaction force receiving material and moving the shaft construction machine downward a predetermined distance. Excavating the lower side of the shaft construction machine while propelling only, assembling segments on the upper side of the shaft construction machine, and constructing an annular retaining wall corresponding to the distance excavated in the excavation process And a pile construction step of constructing a deep foundation pile in the retaining wall as a formwork for burying and retaining the retaining wall.

According to the fourth aspect of the invention, the same effects as those of the first or second aspect can be obtained when constructing an earth retaining shaft in the deep foundation method.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shaft construction machine according to an embodiment of the present invention, a shaft construction method using the shaft construction machine, and a deep foundation method including the shaft construction method will be described with reference to the drawings.

Referring to FIG. 1, the structure of a shaft construction machine 1 according to the present invention will be described. As shown in FIG. 1, the shaft construction machine 1 has a skin plate (tubular body) 8 for holding the inner surface of the shaft.
0, an excavating means 20 provided at the lower end of the skin plate 80, and an assembling means (erector device 70) provided in the upper part of the skin plate 80 for assembling the segments 90 and retaining the soil. It has a main body 10 and a propulsion means 30 for propelling the construction machine main body 10 downward. The propulsion means 30 takes a reaction force from the drill pipe 100 which is buried in advance in the construction position of the shaft as described later.

As shown in FIG. 1, for example, a cutter head 21 is provided as the excavating means 20, and a cutter chamber 50 for taking in earth and sand excavated by the cutter head 21 is provided above the cutter head 21. The cutter head 21 is the same as the cutter head 21 provided in a known shield machine. The cutter head 21 includes a disk-shaped base 24 that rotates around an axis, a plurality of bits 22 provided on the distal end surface of the base 24, a transmission portion 23 that transmits a rotational force to the cutter head 21, and the like. . A circular opening 25 is provided at the center of the cutter head 21 so that the drill pipe 100 can be inserted therethrough.

Further, as a driving means for driving the cutter head 21, a cutter driving motor 24 is provided.
Is provided on the upper portion of the cutter head 21, and the cutter drive motor 24 is provided with control means for controlling a cutter torque and a rotation speed of the cutter head 21. The cutter head 21 is provided with a drive motor 24.
, Via the turning ring 26.

The cutter chamber 50 and the upper part of the construction machine main body 10 are separated by a closing plate 51 provided on the upper part of the cutter chamber 50, and muddy water in the cutter chamber 50 is removed by the vertical shaft construction machine main body 10. It does not flow into the upper part. Further, the closing plate 5
1 is provided with openings 44 and 45 of a water supply pipe 42 and a drainage pipe 41 of a muddy water circulation device 40, respectively.

A rotary water stopping mechanism 52 is provided at the center of the closing plate 51, and the drill pipe 1 is provided.
00 extends from the propulsion means 30 through the rotary water stopping mechanism 52, further through the opening 25 of the cutter head 21, and extends outside the construction machine main body 10.

Further, the drainage pipe 4 of the mud circulation device 40
A slurry pump 43 is connected to 1 and transports muddy water in the cutter chamber 50 to the outside of the pit. And the mixed water sent to the mine is separated into water and earth and sand,
Water is again supplied from the water pipe 42 to the cutter chamber 5 for water supply.
Water is sent within 0. The water pipe 42 of the mud circulation device 40
And a flow meter may be installed in the exhaust pipe 41.

FIG. 4 shows the propulsion means 3 of the shaft construction machine 1 of the present invention.
It shows a state where the area around 0 is enlarged. As shown in FIG. 4, the propulsion means 30 includes a propulsion gripping device unit 31 and a thrust transmission plate unit 32, and the thrust transmission plate unit 32 includes a triangular rib plate 32a, and a lower part of the rib plate 32a. A plurality of hydraulic thrust jacks 60 equidistantly spaced from each other so as to surround the drill pipe 100 are provided vertically downward.

The rib plate 3 of the thrust transmitting plate portion 32
A propulsion gripping device unit 31 is provided on the upper surface of 2a. The lower end portion 31a of the propulsion gripping device 31 and the upper end portion 32b of the thrust transmission plate portion 32 are joined by bolts, and when the drill pipe 100 is refilled later, the bolt is removed and the propulsion gripper is removed. The device part 31 is divided and slid outward from the center axis of the drill pipe 100, so that the drill pipe 100 can be removed from the propulsion means 30. In addition, the propulsion gripping device unit 31
Has a cylindrical shape by joining a plurality of arc plates. A plurality of grooves along the circumferential direction are provided on the inner surface of the propulsion gripping device unit 31 in a vertically aligned manner in correspondence with an engaging portion 110 of a fixing drill pipe 100a, which will be described later. A fixing portion 33 for fixing the propulsion means 30 to the propulsion means 100 is provided.

As shown above, the drill pipe 1
Reference numeral 00 denotes a structure in which a plurality of drill pipes 100 are connected and integrated so as to be connected in a line, and are fixed to the fixing portion 33 on the outer wall of a fixing drill pipe 100a at the top of the drill pipe 100. In the position, the fixing part 33
Is provided with an engaging portion 110 that engages with. As the engaging portion 110 of the drill pipe 100, for example, a plurality of protrusions along the circumferential direction of the drill pipe 100 are provided in a vertically arranged state, and the protrusion is fitted to the fixing portion 33 as described above. Grooves are provided so as to match. With such a configuration, the propulsion gripping device unit 31 is configured such that each arc plate is formed in a cylindrical shape so as to surround the engaging portion 110 of the fixing drill pipe 100a, and is joined to the thrust transmitting plate unit 32, so that the fixing drill pipe 100a And the propulsion gripping device 31 are fixed. Further, by removing the propulsion gripping device unit 31 from the thrust transmission plate unit 32 and distributing it to each of the arc plates, the fixing between the fixing drill pipe 100a and the propulsion gripping device unit 31 can be released.

Further, the fixing portion 33 and the engaging portion 110
Is not limited to that described above. For example, a concave portion is provided on the outermost wall of the uppermost portion of the drill pipe 100, and the convex portion is fitted to the propulsion gripping device 31 of the shaft construction machine 1 so as to fit the concave portion. The structure provided may be sufficient.

A drill pipe 10 serving as a reaction force receiving material
0, drilling may be performed using the drill pipe 100, so that the drill pipe 100 may be installed at the construction position of the shaft, or once drilled with the drill pipe 100 or another drill device, and once drilled with the drill pipe 100.
Alternatively, the drill pipe 100 may be inserted into the bored hole after the other drill device is pulled out.

In place of the drill pipe 100, a wire PC steel wire or other long member can be used as a reaction force receiving member. In addition, the reaction force receiving material is
If it is other than 0, it is necessary to change the fixing structure of the propulsion means 30 and the reaction force receiving member, but a known method of fixing a wire or the like can be used. When the lower end of the reaction force receiving material is to be solidified, for example, a well-known material capable of expanding the diameter of a bid used in boring is used, and a space for the solidification is formed at the lower end of the bored hole. I do. Then, a well-known root consolidation liquid is injected with the reaction force receiving member inserted. In addition, a drill pipe 100
May be used as a pipe, or when a material other than the drill pipe 100 is used as a reaction force receiving material, a tube for injecting a consolidation liquid may be inserted into the bored hole together with the reaction force receiving material. .

Next, the construction order of the shaft construction machine 1 of the present invention will be described. First, boring is performed at a position where a shaft is to be constructed in advance so that the drill pipe 100 which is a reaction force receiving material of the shaft construction machine 1 of the present invention can be inserted into the ground 200,
The drill pipe 100 is inserted into the bored hole. Then, after the tip of the drill pipe 100 of the shaft construction machine 1 reaches a predetermined depth, the consolidation liquid is injected from the opening of the tip to form the consolidation part 150.

In the above case, a hollow portion is provided in the drill pipe 100, and the consolidation liquid is poured from the opening at the upper end of the drill pipe 100. In order to further secure the consolidation portion 150, It is necessary to provide a space around the bottom edge of the hole to be drilled by boring.

In order to provide the space, for example, at the tip of a spiral auger of an excavator used at the time of boring,
A wing-expanding bit is provided in the wall direction of the pile. First, excavation is performed by the spiral auger to a predetermined depth, and when the tip of the spiral auger reaches a depth to be excavated, the bid is expanded. Then, the spiral auger is swung up and down so that the diameter of the enlarged bottom portion is provided to be larger than the diameter of the shaft portion. In addition, the amount of the root compaction liquid is 200 ground.
The amount to be ejected is determined in consideration of the nature of the above.

[0030] When the rooted portion 150 has sufficient strength developed at the tip of the drill pipe 100, the drill pipe 100 and the machine 1
0 is fixed. The drill pipe 100 is connected to the construction machine body 1
0, the engaging portion 110 of the fixed drill pipe 100a is aligned with the position of the fixed fixing portion 33 of the propelled gripping device portion 31 which has been opened, and the propulsion gripping device portion 31 is aligned with the center axis of the drill pipe 100. To slide inward from the engaging portion 110 of the fixed drill pipe 100a,
The protruding gripping device 31 is fitted to the fixing portion 33, and the upper end 32b of the thrust transmitting plate 32 and the lower end 31a of the propelling gripping device 31 are fixed with bolts.

FIG. 1 shows a state in which a shaft is being excavated by the shaft construction machine 1 of the present invention. As shown in FIG.
In order to propel the shaft construction machine 1, first, the muddy water circulation device 40
The valves of the water pipe 42 and the drain pipe 41 are opened to start water supply into the cutter chamber 50 of the shaft construction machine 1.

In the vertical shield method, when the excavation has a certain depth or more, pumping pressure is applied vertically upward to the front surface of the shaft construction machine 1 during propulsion. For this reason, it is necessary to control the muddy water pressure in the cutter chamber 50 to be higher than the pumping pressure applied to the front surface of the construction machine body 10. Therefore, by changing the ratio between the amount of water supplied from the water pipe 42 and the amount of water discharged from the drain pipe 41, the cutter chamber 5
Control the mud pressure within 0. For example, when increasing the muddy water pressure in the cutter chamber 50, the amount of water supplied from the water pipe 42 is increased, and the amount of discharged water from the drain pipe 41 is reduced.
Conversely, in order to decrease the muddy water pressure in the cutter chamber 50, the amount of water sent from the water pipe 42 is reduced, and the amount of water discharged from the drain pipe 41 is increased.

Next, the cutter head 21 on the front face of the construction machine main body 10 is rotated to start face cutting. The cutter head 21 excavates earth and sand on the front of the construction machine body 10,
The excavated earth and sand is sent into the cutter chamber 50 of the construction machine body 10. Then, the water is mixed with the water fed from the water supply pipe 42 in the cutter chamber 50 and is sucked through the opening 44 of the drain pipe 41.

Further, while excavating earth and sand with the cutter head 21 provided below the construction machine main body 10, the thrust jack 60 of the propulsion means 30 is extended, and the construction machine main body 10 is propelled downward. The extension speed of the thrust jack 60 can be freely set, and the construction machine body 10
When the earth and sand accumulate on the front surface of the cutter head 21 and the cutter torque becomes excessive, the propulsion is stopped, and the thrust jack 60 is reduced by a predetermined length. With the earth and sand on the front removed, the thrust jack 60
Excavate while stretching. Further, an agitator device 53 is provided in the cutter chamber 50 to prevent sediment from being deposited in the cutter chamber 50.

As shown in FIG. 1, a backfill material 250 is injected into the space between the ground 200 and the segment 90, and the ground 200 and the segment 90 are integrated. In addition, the skin plate (tubular body) 80 of the construction machine main body 10 is sandwiched in a gap between the segment 90 and the ground 200, and when the construction machine main body 10 is propelled downward, the skin plate (cylindrical body) A new gap is formed at the upper end portion of 80).

The backing material 250 is injected into the new space, and the ground 200 and the segment 90 are fixed. The backfill material 250 is prepared on the ground, and is pipe-pumped to the face of the face. Immediately after the backfill material 250 is injected, it becomes highly viscous, develops a predetermined strength, and
And the ground 200 are integrated.

FIG. 2 shows a side view at the end of propulsion.
As shown in FIG. 2, as the construction machine main body 10 is propelled downward, the thrust jack 60 of the propulsion means 30 is extended, and the propulsion is stopped when the thrust jack 60 is fully extended. When the propulsion is stopped, the cutter driving motor 24 of the cutter head 21 of the shaft construction machine 1 is stopped, and the rotation of the cutter head 21 is stopped. At the same time, the mud circulation device 40 is stopped, and the cutter chamber 5 is stopped.
Stop the water supply and drainage to inside 0.

Next, the assembly of the segment 90 and the rearrangement of the thrust will be described. As shown in FIG. 3, when the thrust jack 60 of the propulsion means 30 extends to the maximum, the rotation of the cutter head 21 and the muddy water circulation device 40 are stopped. Then, the drill pipe 100 is detached from the propulsion gripping device 31 of the propulsion means 30 to perform the work of changing the arrangement.

Next, the procedure for changing the thrust will be described with reference to FIG. First, as described above, the shaft construction machine 1
The propulsion gripping device unit 31 of the propulsion means 30 includes a fixing unit 33 for fixing the drill pipe 100 and the construction machine main body 10, and is fixed to the fixing unit 33 on the uppermost outer wall of the drill pipe 100. At the position, an engaging portion 110 that engages with the fixing portion 33 is provided and fixed. To open the drill pipe 100, first, the upper end 32b of the thrust transmitting plate 32 of the propulsion means 30 and the propulsion gripping device 31
The bolt holding the lower end 31a of the shaft is removed, and the propulsion gripping device 31 is slid toward the wall of the shaft.

Then, the drill pipe 100 is detached from the propulsion gripping device 31 and the uppermost fixed drill pipe 100a provided with the engaging portion 110 and the uppermost fixed drill pipe 100a.
The second drill pipe 100b (hereinafter the second drill pipe)
Is removed, and the fixed drill pipe 100a is temporarily placed in the construction machine. And, the second drill pipe 100
b and the third drill pipe 100c (hereinafter referred to as the third drill pipe) from the uppermost part are cut off, and the temporarily placed fixed drill pipe 100a and the third drill pipe 100c are connected. The second drill pipe 100b is a material input crane 3
At 00, lift on the ground.

At the same time as the above operation, the thrust jack 60 of the propulsion means 30 is contracted to the minimum from the state where the thrust jack 60 is extended to the maximum, and the thrust transmitting plate portion 32 and the propulsion gripping device portion 31 are removed. Lower down. Then, in a state where the fixed drill pipe 100a and the third drill pipe 100c are integrated, the engaging part 110 of the fixed drill pipe 100a is moved to the position of the fixed part 33 of the propelled gripping device part 31 which is opened. Then, the propulsion gripping device unit 31 is slid inward from the center axis of the drill pipe 100 so that the fixed drill pipe 100
The engaging portion 110a is fitted to the fixing portion 33 of the propulsion holding device portion 31, and the upper end portion 32b of the thrust transmission plate portion 32 and the lower end portion 31a of the propulsion holding device portion 31 are fixed with bolts.

Further, at the time of thrust rearrangement, segment 9
The same operation is performed when assembling 0. The segment 90 is manufactured on the ground, and the segment 90 is mounted on the material input crane 30.
At 0, it is lowered to the erector device 70 above the construction machine body 10. Then, the erector device 70 is moved in the direction of the inner wall surface of the shaft, and is moved to the assembly position of the inner wall surface. The segment 90 is assembled along the inner wall of the shaft while the erector device 70 is swung along the inner peripheral surface of the shaft.

After the assembly of the segment 90 is completed, preparation for propulsion is started again, the valves of the water supply pipe 42 and the drainage pipe 41 of the muddy water circulation device 40 are opened, and water supply to the cutter chamber 50 of the construction machine body 10 is started. Then, the cutter head 21 is rotated to start face cutting.

Excavation is continued by the shaft construction machine 1 while repeating the above-described operation, and when the shaft is completed to a predetermined depth, the device in the skin plate 80 of the shaft construction machine 1 is dismantled and the cutter head 21 and the like are dismantled. The parts are lifted and collected by the material input crane 300. When the collection of the shaft construction machine 1 is completed, concrete is poured into the bottom of the shaft to form a bottom.

In addition, a reinforcing bar is disposed in the shaft which has been earthed by the segment 90, and concrete is cast to complete the deep foundation.

[0046]

According to the first aspect of the present invention, the reaction force receiving member is inserted into the bored hole, the lower end of the reaction force receiving member is fixed, and the upper portion of the reaction force receiving member is constructed. By fixing to the machine body, a reaction force for propelling the construction machine body downward can be taken, and excavation can be performed without requiring a large-sized device on the ground as in the related art. Excavation of soft ground will also be possible if the foundation is sufficiently solidified.

According to the second aspect of the present invention, the same effects as those of the first aspect can be obtained, and a deep shaft can be constructed by using a drill pipe as a reaction force receiving member. Even if the reaction force receiving material becomes long, the handling of the reaction force receiving material can be facilitated by connecting and removing the drill pipe. In addition, since the propulsion means always takes a reaction force at the portion of the fixing drill pipe having an engaging portion which engages with the fixing portion of the propulsion means, the reaction force can be easily generated from the cylindrical drill pipe. Can be taken.

According to the third aspect of the present invention, boring is performed in advance at a position where the shaft is to be constructed by the method of constructing a shaft using a shaft construction machine, and the lower end is solidified in the bored hole. While placing the reaction force receiving material in the state, taking the reaction force from the reaction force receiving material and propelling the construction machine body downward,
Since the lower side of the shaft construction machine is excavated, the same effect as the configuration of claim 1 or 2 can be obtained.

Fourthly, according to the fourth aspect of the invention, the same effect as the configuration of the first or second aspect can be obtained when constructing an earth retaining shaft in the deep foundation method.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a shaft construction machine, a shaft construction method and a deep foundation method according to an embodiment of the present invention at the time of starting the propulsion of the shaft construction machine at the time of construction.

FIG. 2 is a cross-sectional view for explaining the end of propulsion of a shaft construction machine at the time of construction in FIG.

FIG. 3 is a cross-sectional view illustrating a vertical shaft construction machine during segment assembly and thrust rearrangement during construction in FIG. 1;

FIG. 4 is a cross-sectional view for explaining a procedure at the time of thrust rearrangement of the shaft construction machine at the time of construction in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vertical shaft construction machine 10 Construction machine main body 20 Excavation means 21 Cutter head 22 Bit 30 Propulsion means 33 Fixing part 40 Mud water circulation device 50 Cutter chamber 60 Thrust jack 70 Erector device (Assembling means) 80 Skin plate (Tube) 90 Segment 100 Drill Pipe 110 Engagement part 150 Rooting part 200 Ground 250 Backfill material 300 Crane for material input

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D029 CA01 CA05 CB06 CC05 CD01 PA03 PD05 2D054 AA07 AC05 AD16 AD37 BA03 BA15 DA12 EA05

Claims (4)

[Claims] 1. A shaft construction machine for retaining an inner wall surface of an inner shaft of a shaft while excavating the shaft, wherein a cylindrical body for holding an inner surface of the shaft at a tip end of the shaft during excavation, and a lower end of the cylindrical body Excavating means provided in the section, and a construction machine body having an assembling means provided in the upper part of the cylindrical body, and assembling a segment to provide an annular retaining wall, boring at a position where a shaft is to be constructed in advance. The drilling means takes a reaction force from the reaction force receiving material in a state where the reaction force receiving material is inserted into the bored hole and the lower end of the reaction force receiving material is fixed. A vertical shaft construction machine comprising a propulsion means for propelling the construction machine body downward during excavation by the mine. 2. A shaft construction machine according to claim 1, wherein said reaction force receiving member is a plurality of connected drill pipes, and said drill pipe has a fixing drill pipe fixed to said propulsion means. The propulsion means is provided with a fixing portion that is detachably fixed to the fixing drill pipe. An outer periphery of the fixing drill pipe has a fixing portion at a position fixed to the fixing portion. An engaging portion is provided to engage with the drill. When the propulsion unit sequentially protrudes the construction machine body downward, a part of the drill pipe below the fixing drill pipe is removed and the fixing drill is removed. By connecting the pipe to the remaining drill pipe, the fixing means is fixed to the fixing drill pipe while moving the fixing drill pipe downward, and the lower end is fixed. Vertical shaft construction machine, characterized in that it takes a reaction force from the drill pipe. 3. A shaft construction method using the shaft construction machine according to claim 1 or 2, wherein boring is performed at a position on the ground where the shaft is to be constructed, and a lower end portion is formed in the bored hole. A reaction force receiving material setting step of arranging the reaction force receiving material in a state where the root is solidified, and then, while taking a reaction force from the reaction force receiving material, propelling the shaft construction machine downward by a predetermined distance, An excavation step of excavating the lower side of the shaft construction machine, and then, an earth retaining step of assembling segments on the upper side of the shaft construction machine and constructing an annular earth retaining wall corresponding to the distance excavated in the excavation step. And a method of constructing a shaft in which the excavation step and the earth retaining step are repeatedly performed to form a shaft that is earth retaining to a predetermined depth. 4. A deep foundation method using the shaft construction machine according to claim 1 or 2, wherein boring is performed at a position where the shaft is to be constructed on the ground, and a lower end is formed in the bored hole. A reaction force receiving material setting step of arranging the reaction force receiving material in a solidified state, and then taking the reaction force from the reaction force receiving material and propelling the shaft construction machine downward by a predetermined distance to thereby form the vertical shaft Excavating the lower side of the construction machine, assembling segments on the upper side of the shaft construction machine, and constructing an annular earth retaining wall corresponding to the distance excavated in the excavation process; A deep foundation method, comprising: a pile construction process for constructing a deep foundation pile in the earth retaining wall as a formwork for filling and killing the retaining wall.