JPH01268984A - Small caliber pipe propelling method and device thereof - Google Patents

Abstract

PURPOSE:To promote the efficiency of propelling work by fixing to a steel casing to adjust an elevation to an optional angle, using a propelling jack into which a propelling pipe is inserted to boom it down to a propelling position and propelling it into the ground by the jack. CONSTITUTION:A propelling jack 7 is supported by a bracket 8 and a pin 9 which are provided to the center of a bearing plate 4, and an elevation hydraulic cylinder 10 is provided between a lower step expansion ring 3 and the vicinity of the base end of the propelling jack 7. Up and down expansion rings 2 and 3 are developed so that both ends of each end section are coupled by a turn buckle 6, and a screw section is adjusted to push the expansion rings 2 and 3 to the internal wall of a casing 1. The elevation hydraulic cylinder 10 is driven in the propelling direction of a propelling pipe (S), and a cylinder 71 is driven under such a state that the propelling pipe (S) is inserted into a cylinder's outside bushing 75 of the propelling jack 7 to propel the propelling pipe (S). Accordingly, the propelling pipe (S) is guided into a vertical shaft by relatively simple work, and can be propelled into the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for supplying a propulsion tube into a starting shaft when a small-diameter propulsion tube such as a Huum tube is laid underground and propelled.

[Conventional technology]

Conventionally, the starting shaft for shield propulsion work has been constructed by driving steel sheet piles A and excavating the inside as shown in Figure 6, or by excavating a bare shaft and digging the shaft as shown in Figure 7. It was based on the method of assembling and installing liner play) B. In either method, the propulsion machine C is supported and fixed in the starting shaft by using jacks in the shaft, anchor bolts buried in the concrete floor, concrete wall plates, welded structures, etc. Then, the propulsion machine C was installed in the starting shaft as shown in Figure 8, and the propulsion tube S was suspended into the starting shaft in a horizontal state and was installed on the propulsion machine C to perform propulsion. .

However, forming such a starting shaft has drawbacks such as requiring a large working space, difficulty in obtaining a shaft with high strength, and low working efficiency.

In order to eliminate the drawbacks of such conventional construction methods, the applicant of the present application has developed a mechanical propulsion construction method in which a steel casing with a circular cross section is buried underground, and this is used as an earth stop and a propulsion reaction force generator. It was disclosed in Japanese Patent Application Laid-Open No. 61-75198.

[Problem to be solved by the invention]

In general, the propulsion jack of the propulsion machine in the starting shaft has a structure that can only extend about twice its own length, so in the conventional propulsion method, the propulsion tube can be pushed out in one operation. For propulsion, the best condition is when the propulsion jack occupies about 1% of the length in the diameter direction of the shaft, and the propulsion pipe occupies about 2% of the length in the diametrical direction of the shaft.

However, it is difficult to construct a large starting shaft using the steel casing method, unlike shafts using the conventional sheet pile construction method or liner plate construction method. The reason for this is that if the steel casing is made larger, large special equipment is required to bury the large steel casing, and large equipment is also required to transport the large steel casing. Become. Furthermore, it is extremely difficult to transport such large equipment and goods, including by road vehicle. For this reason, in the case of an ALJL casing, it is possible to construct a vertical shaft with a diameter of approximately 2 m at most. If we adopt the conventional feeding system by suspending the propulsion tube in such a small-diameter shaft, we will only be able to use short propulsion tubes of about 750 mm or less.

Therefore, the present invention sets a propulsion pipe with a length close to the vertical diameter in the propulsion machine in a steel casing type starting shaft,
The aim is to develop an efficient propulsion method and device and to develop the use of mechanical propulsion methods using steel casings for shafts.

[Means to solve the problem]

The present invention provides a propulsion jack for a propulsion machine installed inside a buried shaft casing made of No. After extrapolating the propulsion tube,
With the propulsion tube extrapolated, the propulsion jack is lowered to the propulsion position, and the propulsion jack is further driven to propel the propulsion tube underground.

〔Example〕

Figures 1 to 5 are diagrams showing embodiments of the present invention, in which the expansion ring as a support for the propulsion jack is unfolded and applied by pressing it against the inner peripheral surface of the steel casing. FIG.

Figure 1 is a plan view showing the device of the present invention applied to a steel casing type starting shaft, Figure 2 is a diagram showing the base of the expansion ring of the device, and Figure 3 is the same as in Figure 2. FIG. 4 is a diagram showing the structure as seen from line 1--2, and FIG. 4 is a diagram showing the structure as seen from line TV-rV in FIG.

In these figures, 1 indicates a steel casing forming a shaft, and 2 and 3 indicate expansion rings attached above and below the bearing plate 4.

The bearing plate 4 has the same radius of curvature as the inner radius of the steel casing 1, has its entire back surface in contact with the inner wall of the steel casing 1, is fixed in contact with the inner wall of the steel casing 1, and is attached to the propulsion jack. The reaction force generated from the operation is directly transferred to the steel casing 1.
is configured to communicate.

The upper expansion rings 2 each have a steel casing 1
Four portions having a radius of curvature that is the same as the inner radius of 2-1.
It is divided into 2-2.2-3.2-4, and each divided portion is bendably connected by a hinge mechanism 5 except for between the final divided rings 2-3 and 2-4. The lower expansion ring 3 is also composed of four divided rings. As a result, the structure is such that it can be inserted into the steel casing 1 in the state shown by the dashed line in FIG.
Turnbuckles 6 are provided at both ends of 0, and after expanding the expansion ring as shown by the arrows in FIG. Then, by adjusting the threaded part of the turnbuckle 6, it is pressed against the inner wall of the aX casing 1, and if necessary, this expanded part is further bolted to strengthen the support and fixation of the bearing plate 4. .

Reference numeral 7 indicates a propulsion jack for propelling the propulsion tube in a predetermined direction from inside the buried steel casing 1. The propulsion jack 7 is connected to the bearing plate 4 as shown in FIG.
An elevating hydraulic cylinder 10 is supported by a bracket 8 and a pin 9 provided substantially at the center of the cylinder, and is provided between the lower expansion ring 3 and the proximal end of the propulsion jack 70.

The propulsion jack 7 has a head 73 provided at the tip of a cylinder rod 72 extended by a cylinder 71 . The head 73 is connected to a cylinder outer cylinder 75 having a propulsion collar 74 at its base.

Further, the head 73 and the cylinder outer tube 75 have an outer diameter slightly smaller than the inner diameter of the propulsion tube to which they are inserted.

Since the propulsion jack 7 has such a structure, its elevation angle can be adjusted to any desired angle using the elevation hydraulic cylinder 10 around the bin 9 attached to the bearing pressure plate 4. With the propulsion tube inserted into the cylinder outer cylinder 75, the cylinder 71 can be driven to propel the propulsion tube.

The one-dot chain line in FIG. 4 shows the state in which the elevation angle of the propulsion jack 7 is at its maximum in order to receive and take up the supplied propulsion tube.

When installing the propulsion jack 7 of this embodiment in the steel casing 1, first install a support device in which the expansion rings 2 and 3 are fixed to the top and bottom of the bearing plate 4 on which the propulsion jack 7 is attached. The bearing plate 4 is lowered in a bent state using a crane to a predetermined depth in the shaft, and the bearing plate 4 is temporarily fixed near a preset position. After fixing the bearing plate 4, expand the upper and lower expansion rings 2.3, connect their respective ends with turnbuckles 6, adjust the screws, and attach the expansion rings 2, 3 to the steel casing 1. Press against the inner wall of the Next, the propulsion direction of the propulsion tube is adjusted using a hydraulic cylinder for elevating the propulsion tube.
After driving 10 and setting it accurately, turn the propulsion jack 7
drive.

FIGS. 5(a) to (to) are diagrams for explaining the propulsion pipe supply and propulsion method, in which a propulsion pipe S such as a concrete pipe or sheath pipe is introduced from the opening of the steel casing 1, This shows the process of continuously propelling the preceding propulsion tube S, which has already been buried.

First, as shown in Figure (a), the sling is made by suspending the propulsion tube S around which the wire W is wound from the hook F of a crane placed outside the shaft, and the outer cylinder 7 of the propulsion jack 7 with the angle of elevation maximized.
Extrapolate the propulsion tube S to 5.

Then, by shortening the drive of the cylinder 10, the elevation angle of the propulsion jack 7 is returned to the horizontal state, as shown in FIG.
Adjust the new receiving propulsion pipe S to the level of the existing propulsion pipe Sl.

Furthermore, the cylinder 71 of the propulsion jack 7 is driven and extended to bring the tip of the new propulsion tube S into contact with the rear end of the existing propulsion tube SlO, as shown in FIG.

Then, the cylinder 71 of the propulsion jack 7 is driven and extended to bury and propel the connected propulsion tubes S and 81.

Since the propulsion jack 7 is closely supported by the AM casing 1 by the bearing plate 4 and the expansion rings 2 and 3, the reaction force of the steel casing 1 can be fully utilized and efficient propulsion work can be performed. .

In this way, in the present invention, the elevation angle of the propulsion jack is raised to extrapolate the propulsion tube to the propulsion jack, and then the propulsion jack is brought down to the propulsion position to propel the propulsion tube underground. Even in a small-diameter starting shaft using the casing method, a propulsion pipe of the same length as in the case of a conventional shaft can be introduced into the shaft and propelled underground.

〔Effect of the invention〕

The following effects can be achieved by the present invention.

(1) It is possible to use a propulsion jack that is fixed to the ILJ casing, can adjust the elevation angle to any angle, and can be used to extrapolate the propulsion tube. It can be introduced into a shaft and propelled underground by operation.

(2) Since the length of the propulsion jack can be made long, one propulsion tube can be propelled in the - process, which improves the efficiency of the entire propulsion work.

(3) Since the reaction force of the steel casing is utilized to the maximum, the device for supporting the propulsion jack becomes simple.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the state in which the device according to the embodiment of the present invention is applied to a steel casing type starting shaft, Fig. 2 is a view showing the state of the base of the expansion ring of the same device, and Fig. 3 is a plan view showing the state of the base of the expansion ring of the device. Figure I
Figure 4 is a diagram showing the structure as seen from the II-III line, Figure 4 is a diagram showing the structure as seen from the I'l/-rV line in Figure 1, and Figure 5 is for explaining the propulsion tube supply and propulsion method. This is a diagram. FIGS. 6 to 8 are diagrams showing the conventional propulsion method. Lea casing 2: Upper expansion ring 3: Lower expansion ring 4: Bearing plate 5: Hinge machine m 6: Turnbuckle 7: Propulsion jack 8 Bracket 9: Pin
10: Elevation hydraulic cylinder 11: Propulsion pipe 71 Niji linter? 2 Niji Linder Lot 7
3: Head 74: Propulsion collar 75; Cylinder outer cylinder patent applicant Toa Kikai Kogyo Co., Ltd. (and one other person)
Masu Kobori (and 2 others) Figure 6 Figure 7 Whistle 8 Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A propulsion jack is attached to a bearing plate provided on the inner surface of a buried steel casing for a shaft, the elevation angle of the propulsion jack is raised, and a small-diameter propulsion pipe is externally inserted into the propulsion jack. A small-diameter pipe propulsion method characterized by lowering a propulsion jack to the propulsion position with the propulsion tube extrapolated, and further propelling the propulsion tube underground by driving the propulsion jack. 2. A small diameter pipe propulsion device, characterized in that a propulsion jack is attached to a bearing plate provided on the inner surface of a buried steel casing for a vertical shaft, the elevation angle of which can be adjusted and a small diameter propulsion pipe can be externally inserted.