JPH08319791A - Construction method of vertical shaft - Google Patents

Abstract

PURPOSE: To construct a vertical shaft in a short period of time without using a large construction area by pressing cylinder bodies into the ground to excavate the ground by a cutter provided at the lower parts of the cylinder bodies, and extending the cylinder bodies in regular order. CONSTITUTION: Cylinder bodies 11, 11 made of steel are pressed into the ground by applying reaction to anchors 15, 15 driven around the cylinder bodies 11. At the same time, torque is imparted to a cutter 12, provided at the lower part of the cylinder bodies 11, from a driving device 132 installed on the ground, through a rotary shaft 122 disposed midway so as to excavate the ground. With the progress of excavation, the cylinder bodies are successively extended to excavate forward to the specified depth. At this time, the rotary shaft 122 is also extended in regular order. A vertical shaft can be constructed obliquely by driving the anchors 15 obliquely and installing the cylinder bodies 11 obliquely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a shaft.

[0002]

2. Description of the Related Art Conventionally, as a method of constructing a vertical shaft for starting a shield machine, a caisson method, an underground continuous wall method,
The steel sheet pile method is known.

[0003]

Each of the above-mentioned conventional shaft construction techniques has the following problems. <B> Construction work requires a considerably larger construction area than the vertical section. Therefore, the shaft construction cannot be performed in a place where a large construction area cannot be secured. <B> The construction period is long.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for constructing a vertical shaft that does not require a large construction area and can be constructed in a short period of time. To do.

[0005]

That is, according to the present invention, a cylinder is press-fitted into the ground and simultaneously excavated by a cutter provided in the lower part of the cylinder, and the cylinder is extended to a predetermined depth while being replenished. , How to construct a shaft. The present invention also provides
In the method of constructing a vertical shaft described above, the tubular body is made of steel, and the method of constructing a vertical shaft is provided. Further, the present invention is the method for constructing a vertical shaft according to the above-described method for constructing a vertical shaft, characterized in that the press-fitting of the tubular body is performed by applying a reaction force to an anchor placed around the tubular body. Further, the present invention, in the method for constructing a vertical shaft described above, wherein the anchor is diagonally driven, and the cylinder is diagonally installed, and the vertical shaft is constructed obliquely, a method for constructing a vertical shaft. Is. Further, the present invention, in the method for constructing a vertical shaft as described above, the cutter is given a rotational force by a rotary shaft arranged between a drive device installed on the ground, and the rotary shaft advances the excavation of the tubular body. It is a method of constructing a shaft, which is characterized in that it is replenished and extended along with. Further, the present invention is the method of constructing a vertical shaft according to the method of constructing a vertical shaft, wherein the rotary shaft also serves as a sludge pipe. Further, the present invention is the method for constructing a vertical shaft, characterized in that, in the method for constructing a vertical shaft as described above, a supporting device is installed between the cylindrical body and the rotary shaft. The present invention is also the method of constructing a vertical shaft according to the above-described method of constructing a vertical shaft, characterized in that the supporting device is extendable. Further, the present invention is the method for constructing a vertical shaft, wherein in the method for constructing a vertical shaft as described above, when the tubular body reaches a predetermined depth, concrete is placed at the bottom of the tubular body. Further, the present invention provides the method for constructing a shaft as described above, wherein the cutter is configured to be movable back and forth via a rotary shaft by a drive device installed on the ground, and the cutter is moved forward to excavate the cylinder prior to press-fitting. After performing the above step, the cutter is retracted to press-fit the cylindrical body, which is a method for constructing a vertical shaft.

[0006]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. <A> Excavation device (Fig. 1) (1) Cylinder body The cylinder body 11 has a hollow cylinder shape, and as shown in Fig. 1, is a soil retaining member that is axially replenished to form a wall body of a shaft. is there. As the tubular body 11, one having rigidity that can withstand earth pressure can be adopted, and a steel one is preferable. It should be noted that any other material may be used as long as it has rigidity.

(2) Cutter A cutter 12 is formed on the lower surface of the cylindrical body 11. The cutter 12 has a bit protruding toward the lower surface side,
The excavator is provided with an overcutter 121 that can extend toward the outer periphery thereof. As the overcutter 121, for example, one that can be controlled by hydraulic pressure can be adopted. A rotary shaft 122 is connected to the back surface of the cutter 12, and is arranged along the center of the cylindrical body 11. The rotary shaft 122 is a drive shaft of the cutter 12, is composed of a hollow tubular body, is open to the front surface of the cutter 12, and serves as a means for discharging excavated soil in a negative pressure state inside.

(3) Press-fitting body A press-fitting body 13 is placed on the upper part of the cylindrical body 11. The press-fitting body 13 is a member for pushing the tubular body 11 into the ground below. The pushing force of the press-fitting body 13 is applied as a reaction force to the anchor 15 placed in the ground. That is, the anchor 15 is placed in the ground around the installed cylindrical body 11, and the tension member 151 continuous with the anchor 15 is extended from the ground.
The press-fitting body 13 is penetrated and the upper surface side is held by the center hole jack 131. The center hole jack 131 is extended, and the cylindrical body 11 is inserted through the press-fitting body 13.
Can be pushed into the ground.

(4) Drive Device / Excavation Pump / Hydraulic Device The press-fitting body 13 is provided with a drive device 132, an excavation pump 133 and a hydraulic device 134. Drive device 132
Is a device that applies a rotational force to the rotary shaft 122, and is fixed integrally with the press-fitting body 13. Further, the drive device 132 has a structure in which the rotary shaft 122 is movable along its axial direction, and the movement causes the rotary shaft 122 to move.
The cutter 12 can be moved back and forth through the. The soil discharge pump 133 is a device that is connected to the drive device 132 and that brings the inside of the rotary shaft 122 into a negative pressure state. Hydraulic system 134
Is a device that controls expansion and contraction of the overcutter 121 and the support device 14, and is connected to the overcutter 121 and the support device 14 by a pipe 135.

(5) Supporting Device On the other hand, the supporting device 14 is installed between the rotary shaft 122 and the inner surface of the cylindrical body 11 at a predetermined interval. The support device 14 is a stretchable rod-shaped body, and is configured to include a stretchable jack 141 at one end thereof, for example.
The support device 14 has a function of preventing rotational shake of the rotary shaft 122 and a deformation of the tubular body 11 that retains soil when the rotary shaft 122 is extended by adding a plurality of rotary shafts 122.

<B> Placing Anchor (FIG. 2) First, the guide wall 20 is constructed on the ground surface portion at the planned construction position of the vertical shaft. The guide wall 20 is a structure for stabilizing the initial excavation of the tubular body 11. Next, the anchor 15 is driven around the planned vertical shaft construction position while penetrating the guide wall 20. This anchor 15 is a cylindrical body 1.
In order to give a uniform pushing force to 1, it is preferable to place a plurality of cylinders at symmetrical positions about the cylindrical body 11. And
The tension member 151 continuous with the anchor 15 in the ground is extended onto the guide wall 20, and the extension length is set to be at least one cylinder 11 or more.

<C> Installation of Cylindrical Body (FIG. 2) With the guide wall 20 penetrated, the cylindrical body 11
Is installed at the planned construction position of the vertical shaft. At this time, the cutter 12 for excavation is placed on the lower side with the axial direction of the tubular body 11 facing downward, and the press-fitting body 13 is placed on the tubular body 11. Then, the end portion of the tension member 151 is passed through the press-fitting body 13, and the center hole jack 1 is provided on the upper surface side of the press-fitting body 13.
It is grasped by 31. The installation work of the cylinder 11 is
It may be performed before the anchor 15 is placed.

<D> Excavation of the cylinder (FIGS. 1 and 2) The excavation of the cylinder 11 is performed by alternately excavating the cutter 12 and press-fitting the cylinder 11. That is, before the cylinder body 11 is press-fitted, first, the lower part of the cylinder body 11 is excavated by the cutter 12. The excavation by the cutter 12 is performed by driving the drive device 132 to rotate the cutter 12 via the rotary shaft 122 and advance the cutter 12 downward. When the cutter 12 rotates, the overcutter 121 is extended. Further, the reaction force for the cutter 12 to move forward is taken by the anchor 15 via the rotary shaft 122, the drive device 132, the press-fitting body 13 and the tension member 151. The excavated soil excavated by the cutter 12, as shown in FIG.
It is discharged upward through.

After excavating the lower part of the cylindrical body 11 to some extent, the cutter 12 is retracted upward, and then the cylindrical body 11 is removed.
The cylinder 11 is pressed downward against the friction of the earth and sand. When the cylinder body 11 is press-fitted, a reaction force is applied to the anchor 15, and the tension member 1
By pushing down the center hole jack 131 holding 51, the cylindrical body 1 is pressed through the press-fitting body 13.
Push 1 into the ground. At that time, the reaction force applied to the anchor 15 differs depending on the magnitude of the frictional force between the cylindrical body 11 and the sand.

Thus, the excavation of the cutter 12 and the cylindrical body 11
By separately performing the press-fitting step of 1, the reaction force applied to the anchor 15 is shared in each step, and the excavation of the cylindrical body 11 can be efficiently performed. That is, in each process of excavating the cutter 12 and press-fitting the cylinder 11, a large reaction force is applied to the anchor 15, so that the cutter 12 can be moved forward and the cylinder 11 can be press-fitted smoothly.

Further, when the cylinder body 11 is displaced in the direction of excavation, it can be easily corrected by adjusting the amount by which the center hole jack 131 is pushed down. For example, by making the pressing amount of the center hole jack 131 located in the correction direction of the tubular body 11 larger than that of the others, the excavation direction of the tubular body 11 can be easily corrected.

<E> Replenishment of cylinder and rotary shaft (FIG. 3) When the cylinder 11 is dug downward until the upper end of the cylinder 11 is near the guide wall 20, the center hole jack 1
The tension member 151 is released from 31 and the press-fitted body 1 on the cylindrical body 11
3 is lifted upward, and a new cylinder 11 is connected to the upper part of the cylinder 11. The cylindrical bodies 11, 11 may be connected by a known method such as welding. The press-fitting body 13 may be lifted by, for example, lifting it with a heavy machine. Meanwhile, the rotary shaft 122 is added together with the addition of the cylindrical body 11. That is, the existing rotary shaft 122 and the driving device 132 are separated, and a new rotary shaft 122 is added between them.

<F> Installation of Support Device When the rotary shaft 122 is replenished, as shown in FIG. 3, the support device 14 is installed between the intermediate part of the rotary shaft 122 and the inner surface of the cylindrical body 11 at a predetermined interval. Its support device 14
A bearing or the like is provided between the rotary shaft 122 and the rotary shaft 122 to allow the rotary shaft 122 to rotate. By disposing the supporting device 14, the rotating shaft 12
In addition to the prevention of rotational runout of 2, the cylindrical body 11 is prevented from being deformed.

<G> Re-digging When the replenishment of the tubular body 11 is completed, the press-fitting body 13 is placed on the new coupled tubular body 11, and the new rotary shaft 12 is placed.
2 and the drive device 132 are connected. Then, similarly to the above, excavation of the cutter 12 and the center hole jack 131.
By pushing the cylinder body 11 downward,
The excavation step 1 and the step of adding the cylindrical body 11 are repeated as necessary.

<C> Concrete pouring (FIG. 4) When the cylinder 11 reaches a predetermined depth, the cylinders 11, 11 ...
The members such as the cutter 12, the rotating shaft 122, and the supporting device 14 are pulled up to the ground leaving the above. At that time, cutter 1
The second overcutter 121 is contracted. The raised cutter 12, the rotating shaft 122, the support device 14, and the like can be reused for another construction. Then, a rebar cage or the like is lowered on the bottom portion inside the tubular body 11, and the underwater concrete 30 is poured to complete the construction of the vertical shaft.

[0021]

[Second Embodiment] In the method of constructing a vertical shaft, the vertical shaft may be constructed obliquely. That is, the tubular body 11 is previously installed diagonally, and the anchor 15 is diagonally installed,
In addition to excavating the cutter 12, a vertical shaft can be constructed by obliquely pushing the tubular body 11 by applying a reaction force to the anchor 15.

[0022]

[Embodiment 3] In the method of constructing a vertical shaft, the cylindrical body 1 is used.
In the excavation of No. 1, the excavation of the cutter 12 and the press-fitting of the cylindrical body 11 may be performed simultaneously.

[0023]

Since the present invention is as described above, the following effects can be obtained. <A> Since the cylinder to be dug up becomes the wall of the vertical shaft as it is, a large occupied area is not required for constructing the wall of the vertical shaft.
Therefore, it is possible to construct a shaft even if the construction site is narrow. <B> Since the earth retaining wall is constructed at the same time as the excavation of the vertical shaft, there is no need to perform the wall construction work in addition to the excavation work.
Therefore, the shaft can be constructed in a short period of time. <C> If the anchor is cast diagonally and the cylinder is excavated diagonally, the shaft can be easily constructed in the diagonal direction. <D> Since the support device is installed between the rotary shaft that drives the cutter and the tubular body, therefore, it is possible to prevent rotational runout of the rotary shaft that has been lengthened by extension and prevent deformation of the tubular body due to earth pressure. be able to. <E> If the rotary shaft is formed of a tubular body and the rotary shaft is opened on the front surface of the cutter, the excavated soil on the front surface of the cutter can be discharged from the cylinder through the rotary shaft. <V> By constructing the cutter so that it can move back and forth, excavating the cutter, and then press-fitting the cylinder, the reaction force applied to the anchor is shared. For this reason, in each process of excavating the cutter and press-fitting the cylinder, a large reaction force can be obtained by the anchor, so that the cutter can be advanced and the cylinder can be press-fitted smoothly.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method of constructing a vertical shaft.

[Fig. 2] An explanatory view of a method of constructing a vertical shaft

FIG. 3 is an explanatory diagram of a method of constructing a vertical shaft.

FIG. 4 is an explanatory view of a method of constructing a vertical shaft.

Claims (10)

[Claims] 1. A method of constructing a vertical shaft, which comprises: press-fitting a tubular body into the ground, excavating the tubular body with a cutter provided at a lower portion of the tubular body, and advancing to a predetermined depth while adding the tubular body. 2. The method for constructing a vertical shaft according to claim 1, wherein the tubular body is made of steel. 3. The method for constructing a vertical shaft according to claim 1, wherein the press-fitting of the tubular body is performed by applying a reaction force to an anchor placed around the tubular body. How to build. 4. The vertical shaft construction method according to claim 3, wherein the anchor is diagonally driven and the tubular body is diagonally installed to construct the vertical shaft diagonally. How to build. 5. The method for constructing a shaft according to claim 1, wherein the cutter is provided with a rotational force by a rotary shaft arranged between the cutter and a drive device installed on the ground, and the cutter is rotated. A shaft constructing method, wherein the shaft is extended by being added as the cylinder progresses. 6. The method for constructing a vertical shaft according to claim 5, wherein the rotary shaft also serves as a mud discharge pipe. 7. The method for constructing a vertical shaft according to claim 5, wherein a supporting device is installed between the cylindrical body and the rotary shaft. 8. The method for constructing a vertical shaft according to claim 7, wherein the support device is extendable and retractable. 9. The method for constructing a vertical shaft according to claim 1, wherein when the tubular body reaches a predetermined depth, concrete is placed at the bottom of the tubular body. How to build. 10. The method for constructing a shaft according to claim 1, wherein the cutter is configured to be movable back and forth via a rotary shaft by a drive device installed on the ground, and the cutter is moved forward. A method for constructing a vertical shaft, characterized in that, after excavation is performed prior to press-fitting the cylinder, the cutter is retracted to press-fit the cylinder.