JPH10115175A - Device for forcing in casing for vertical shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for forcing in a casing which can handle a casing having relatively small diameter. SOLUTION: The device for forcing in a casing for a vertical shaft includes a hydraulic motor 22 mounted on a base body 40 and an auger screw 10 driven by the motor 22. And under such conditions that the screw 10 is mounted to the body 40 and made rotatable in the length direction of a casing C, a hydraulic cylinder 31 is provided to releasably fix the device itself to the inner side of the casing C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical shaft casing press-fitting device for press-fitting a casing for forming a side wall surface of a vertical shaft into a ground when a vertical shaft is constructed on the ground.

[0002]

2. Description of the Related Art Conventionally, the work of arranging sewer pipes has been mainly carried out by an open-cutting method. This excavation method is a method in which the ground is cut in a groove shape along the direction of arranging the sewer sewer, and a sewer is arranged and buried along the groove. However, it has become difficult to implement this excavation method due to changes in traffic conditions (increase in traffic volume) and the like. Therefore, in recent years, a propulsion method has been implemented in which a sewer is propelled from a shaft provided on the ground in the direction in which the sewer is disposed, and is installed underground.

[0003] In this propulsion method, it is necessary to construct a shaft in the ground prior to the installation of a sewer pipe, but as a method of constructing a shaft, a steel sheet pile is poured into the ground and the steel sheet pile is used to surround the shaft. There is a sheet pile method that excavates the ground and constructs a shaft. This sheet pile method is a technique suitable for constructing a large shaft with a large opening area. However, many construction works rely on human labor, and therefore the construction period tends to be prolonged.

[0004] In contrast to the sheet pile method, a casing press-fitting method in which a steel cylindrical casing (for example, a steel pipe) is pressed into the ground using a special special machine, and the inside of the casing is excavated to construct a shaft. No. This casing press-fitting method is a technique in which one end of the casing is gripped by a special machine and the casing is rocked and press-fitted in the circumferential direction, and is a technique suitable for constructing a medium-sized shaft that is slightly smaller than the sheet pile method. However, it is possible to dramatically shorten the construction period.

[0005]

Incidentally, in the above-mentioned construction work of sewer sewers, recently, a small scale (diameter of 1) has been proposed.
Although there is an increasing demand for vertical shafts (about 000-3000 mm), the size of casings that can be handled by conventional special machines is limited, and those with a smaller diameter than the predetermined casing cannot be handled. Construction of shafts was sometimes difficult. In addition, there is a problem that the cost of procurement and operation of the special machine itself is very large and the cost of procurement and operation thereof is increased, thereby greatly increasing the construction cost of the shaft.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vertical shaft casing press-fitting device which is used in a casing press-fitting method and can handle a casing having a relatively small diameter. The purpose is.

[0007]

The vertical shaft casing press-fitting device of the present invention is provided on an auger screw, a rotation drive mechanism for rotating the auger screw, and a base on which the rotation drive mechanism is mounted. With this rotatable in the length direction of the casing,
A fixing mechanism for detachably fixing the press-fitting device itself to the inside of the casing. Then, the casing is pressed into the ground by rotating the auger screw to make the press-fitting device sunk into the ground.

This vertical shaft casing press-fitting device is desirably fixed inside the casing with the tip of the auger screw protruding from one end of the casing. After fixing the casing press-fitting device for shafts in this way and installing the press-fitting device on the ground surface and rotating the auger screw, the tip of the auger screw dives into the ground ahead of the casing, and the casing is Before reaching the ground surface, the auger screw "grasss" against the ground
Is obtained. The vertical shaft casing press-in device can press the casing against the ground surface by obtaining this "grasping". Then, if the auger screw is sunk under without losing this "grasping", it becomes possible to press the casing toward the ground with a greater force than the resistance force received from the ground. Press-fit.

Further, in this vertical shaft casing press-fitting device, a hydraulic motor having a relief valve provided in a flow path of hydraulic oil is employed as a rotary drive mechanism, and a base end of the auger screw is located outward of the auger screw blade. When the auger screw goes all the way into the ground, the overhang reaches the surface, and the resistance acting from the ground against the rotation of the auger screw suddenly increases, the relief valve operates. If the rotation of the hydraulic motor is set to be controlled (stopped), it can be used as an automatic stop mechanism for the auger screw when the casing is press-fitted.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a vertical shaft casing press-fitting device according to the present invention will be described with reference to FIGS. The shaft casing press-fitting device for shafts, as shown in FIG.
The casing C, which is set almost vertically on the surface of the ground, is configured to be pressed into the ground, and the auger screw 10 and
A rotation drive mechanism 2 for rotating the auger screw 10
0 and a fixing mechanism 30 for detachably fixing the press-fitting device inside the casing C.

The total length of the auger screw 10 is set slightly longer than the length of the casing C to be pressed into the ground.
It is mounted so as to be rotated by the rotation drive mechanism 20.

As the rotary drive mechanism 20, a hydraulic motor 22 that rotates by receiving a supply of hydraulic oil from a hydraulic oil supply mechanism 21 installed close to the outside of the press-in device is employed. The hydraulic motor is mounted on the base 40 of the press-fitting device, and the auger screw 10 is directly connected to the rotation shaft.

As the fixing mechanism 30, a hydraulic cylinder 31 driven by an external hydraulic oil supply mechanism (not shown) is employed similarly to the hydraulic motor 22. The hydraulic cylinder 31 is disposed on the base 40 in the same manner as the hydraulic motor 22. As shown in FIG. 2, the hydraulic cylinder 31 is disposed so that the piston rod 32 can project in four directions with the rotation axis of the auger screw 10 as a virtual center. . It should be noted that two of the four piston rods 32 are dummy, and the piston rods 32a are not driven by hydraulic pressure, and can be fixed by freely adjusting the protrusion length according to the inner diameter of the casing C. Has become.

By the way, the hydraulic motor 22 is provided with a relief valve 23 in a supply path (flow path) of the hydraulic oil, and when the resistance acting on the ground against the rotation of the auger screw 10 increases, the relief valve 23 is provided. It is set so that the rotation of the hydraulic motor 22 is stopped by the operation of the hydraulic motor 22. Further, a plurality of fins (overhang portions) 11 are provided at the base end of the auger screw 10. Fin 1
Numeral 1 is not continuous with the blade 10a of the auger screw 10, and projects outward more than the blade 10a. These components constitute an automatic stop mechanism of the auger screw 10 when the casing C is press-fitted.

A construction for press-fitting the casing C into the ground using the vertical shaft casing press-fitting device constructed as described above will be described. The shaft press-fitting device for a shaft uses a piston rod 32 inserted into the casing C near the other end in a state where the tip of the auger screw 10 is protruded from one end of the casing C to be pressed into the ground where the press-fitting into the ground is started. Is fixed by pressing the auger screw 10
The casing C is press-fitted into the ground by rotating the casing C into the ground.

Therefore, as shown in FIG. 3A, a shallow hole large enough to fit the casing C into the ground at the construction position of the shaft was excavated, and the casing press-fitting device for the shaft was fixed to this hole. The casing C is inserted and set up on the ground surface. In order to excavate a shallow hole in advance, it is necessary to install the shaft casing press-fitting device in an upright position, and to make a relief for the size of the device placed inside the casing C by making a clearance. This is because it is considered that all the C is pressed into the ground.

When the auger screw 10 is rotated in this state, the tip of the auger screw 10 protruding from one end of the casing C enters the ground prior to the casing C, and reaches the ground before the casing C reaches the ground surface. On the other hand, a "grab" of the auger screw 10 is obtained. The vertical shaft casing press-in device can press the casing C against the ground surface by obtaining this "grasping".

When the auger screw 10 is further sunk into the ground without losing this "grasping",
The casing C can be pressed toward the ground with a greater force than the resistance force received from the ground, whereby the casing C is gradually pressed into the ground as shown in FIG. Go.

When the auger screw 10 goes under and the casing C is almost pressed into the ground, and the base end of the auger screw 10 approaches the ground surface and the fins 11 reach the ground surface as shown in FIG. Since it is not continuous with the blade 10a of the auger screw 10 and projects outward more than this, the resistance force acting from the ground against the rotation of the auger screw 10 sharply increases. The relief valve 23 operates in response to the change in the resistance, and the rotation of the hydraulic motor 22 is stopped by leaking hydraulic oil.

The earth and sand filled inside by the press-fitting of the casing C is stopped after stopping the vertical shaft casing press-in device.
A water jet is sprayed on the inside of the casing C to break the ground, and muddy water is sucked out by a pump and discharged out of the casing C. Lastly, the hydraulic cylinder 31 is operated to remove the shaft casing press-fitting device from the casing C, and the construction is completed.

[0021] The foundation concrete is poured into the bottom of the casing from which the earth and sand has been excavated to complete the shaft. After the shaft is constructed, the pipe propulsion device S is installed on the foundation B as shown in FIG. 3 (d), and the buried pipe P serving as a sewer pipe is propelled and installed.

If this vertical casing press-fitting device is used, the construction and operation can be simplified compared with the conventional special machine, so that the procurement and operation are not costly and the construction cost of the shaft is low. Can be suppressed.

Since the press-fitting device is disposed inside the casing C, it is not necessary to secure a place for loading and installing a special machine at the construction position of the shaft as in the prior art, and construction can be performed even in a place where a building is built. Can be implemented.

Since the structure of the press-fitting device is simple, the size can be reduced, and a small-diameter casing that cannot be handled by a conventional special machine can be handled. It is possible to construct a shaft.

This vertical shaft casing press-in device goes underground as long as the hydraulic motor 22 rotates, but stops when it goes down to an appropriate depth by an automatic stop mechanism, so that excessive press-in of the casing C is prevented. can do.

In the vertical shaft casing press-in device described in the present embodiment, the auger screw 10 is disposed inside the casing C and is rotated. At this time, the center axis of the casing C and the auger screw 10 are rotated.
Are fixed in a state where their rotation axes are substantially coincident with each other, so that the casing C receives the rotation of the hydraulic motor and a rotation reaction force acts in a direction opposite to the rotation direction of the auger screw 10. If the casing C is rotated by the rotation reaction force, the auger screw 10 becomes difficult to sink into the ground. Therefore, the casing C is rotated with respect to the ground, for example, by installing a plurality of barbed projections on the outer surface of the casing C. It is desirable to employ a means for obtaining resistance in the direction in which it is intended.

In the vertical shaft casing press-fitting device described in this embodiment, the hydraulic motor 22 is used as the rotary drive mechanism 20 and the hydraulic cylinder 31 is used as the fixing mechanism 30, but each mechanism is limited to these. A structure having a different structure may be adopted without any change.

The auger screw 10 is provided with a series of blades 10a over its entire length. However, since the auger screw 10 only has to get into the ground with a "grab" on the ground at its tip, It is also possible to adopt one having a blade only at the tip.

Next, a second embodiment of the vertical shaft casing press-fitting device of the present invention will be described with reference to FIG. The shaft casing press-fitting device includes two auger screws 10 and two hydraulic motors 22 as their rotation drive mechanisms 20, and the rotation axes of the auger screws 10 are set in parallel. When the shaft press-fitting device is fixed inside the casing C, the auger screws 10 are arranged on both sides of the central axis of the casing C.

In this vertical shaft casing press-fitting device, since two auger screws 10 are provided and the center axis of the casing C and the rotation axis of the auger screw 10 are separated and located at different positions, the casing C has a hydraulic motor Since the rotational reaction force does not act, there is no need to provide means (protrusions, etc.) for counteracting the rotational reaction force in the casing C, and the press-fitting of the casing C can proceed stably.

In the vertical shaft casing press-in device described in this embodiment, the auger screw 10 is used.
Are provided, but it is also possible to provide a plurality of, for example, four auger screws 10 and hydraulic motors by examining the performance of the auger screws 10 and the hydraulic motors.

[0032]

As described above, the vertical shaft casing press-in device of the present invention has a simple structure and can be easily operated as compared with the conventional special machine, so that the procurement and operation thereof are not costly. The construction cost of the shaft can be kept low. Since the configuration of the press-fitting device is simple, it is possible to reduce the size, and it is possible to handle small-diameter casings that could not be handled by conventional special machines. Construction becomes possible.
Since the press-fitting device is placed inside the casing, there is no need to secure a place to install and install special machines at the construction position of the shaft as in the past, and it is possible to carry out construction even at the place where the building was built. it can. In addition, since the hydraulic motor is stopped by the automatic stop mechanism when the vehicle descends to an appropriate depth, excessive press-fitting of the casing can be prevented, and the operability of the device can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a shaft press-fitting device for a shaft according to the present invention.

FIG. 2 is a plan view of the vertical shaft casing press-fitting device shown in FIG. 1 as viewed from above.

FIG. 3 is an explanatory diagram showing a construction procedure for press-fitting a casing into the ground using the shaft press-fitting device for a shaft shown in FIGS.

FIG. 4 is a side view showing a second embodiment of the shaft press-fitting device for a shaft according to the present invention.

[Explanation of symbols]

 C Casing 10 Auger screw 11 Fin (projection part) 20 Rotation drive mechanism 21 Hydraulic oil supply mechanism 22 Hydraulic motor 23 Relief valve 30 Fixing mechanism 31 Hydraulic cylinder 32 Piston rod 40 Base

Claims (3)

[Claims] 1. A shaft casing press-fitting device for press-fitting a cylindrical casing forming a wall surface of the shaft into the ground in a longitudinal direction thereof when constructing the shaft, comprising: an auger screw; A rotary drive mechanism for driving the screw to rotate, provided on a base on which the rotary drive mechanism is mounted, and in a state in which the auger screw is rotatable with the auger screw directed in the longitudinal direction of the casing, the press-fitting device itself is mounted on the casing. And a fixing mechanism for detachably fixing the casing to the inside thereof. 2. The shaft casing press-fitting device according to claim 1, wherein the auger screw is fixed inside the casing with a tip of the auger screw protruding from one end of the casing. Press-in device. 3. The shaft casing press-fitting device according to claim 1, wherein the rotary drive mechanism includes a hydraulic motor provided with a relief valve in a flow path of hydraulic oil, and a base of the auger screw. At the end, there is provided an overhang portion that protrudes outward from the blade of the auger screw, the auger screw is sunk into the ground, the overhang portion is grounded, and a resistance force acting from the ground against rotation of the auger screw is provided. When the pressure increases, the relief valve operates to control the rotation of the hydraulic motor, so that the shaft press-fitting device for the shaft is used.