JPS6114319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for press-fitting a tubular body into the ground.

Conventionally, the method of press-fitting a tubular body such as a steel pipe into the ground is to press the rear end of the tubular body with a hydraulic propulsion jack, then reset it by interposing a spacer corresponding to the elongation of the jack stroke. A method is known in which the tubular body is again pressed through a spacer by jacking.

However, when press-fitting a tubular body several times the length of the jack stroke using the conventional construction method,
Since the jack presses the tubular body through a large number of spacers, if the jack thrust is eccentric, the spacers may fly off, which is dangerous. Furthermore, since a large number of spacers are used, there is a problem in that a large amount of work space is required.

The object of the present invention is to provide a tubular body press-fitting device that advantageously solves the above-mentioned problems.

Next, the present invention will be explained in detail using illustrated examples.

The drawings show embodiments of the invention,
A large number of anchor holes extending in the direction of propulsion of the tubular body are drilled in the ground around the planned position of the tubular body press-in from within the starting recess 11 provided in the ground 1, and the anchor rod 12 inserted into the anchor hole is The anchor member (not shown) at the tip is expanded and engaged with the ground, so that the anchor rod 1
2 is strongly anchored to the ground 1, and the flange at the front end of the cylinder 2 of the center hole jack 3 is fixed by a nut 13 screwed into the rear end of the anchor rod 12, and the center of the center hole jack 3 is A tubular body 4 such as a steel pipe is inserted into the hole.

A propulsion rod 7 is constructed by connecting a large number of unit rods 5 via a threaded joint 6 made of a shuttle coupler, and the rear end of the threaded joint 6 is integrally connected to the rear unit rod. A truncated conical surface is formed at the rear end of the threaded joint 6, and a large number of propulsion rods, for example 4 to 6, are arranged at equal intervals in the circumferential direction of the tubular body 4 behind the center hole jack 3. The front end of each propulsion rod 7 is inserted into the flange at the rear end of the hollow piston 8 in the center hole jack 3 and is tightened into the nut 1.
4, and the rear part of each propulsion rod 7 includes a flange of an annular pressing member 9 detachably fitted to the rear end of the tubular body 4, a box 15 fixed to the rear surface, and a box 15 fixed therein. The automatic locking device 10 is inserted into the housing.

The structure of the automatic locking device 10 will be explained as follows.
A semi-cylindrical recess 16, a semi-truncated conical recess 17 connected to the front end thereof, and a side flange 18
a pair of semi-annular bodies 19 having a cylindrical hole and a frusto-conical hole are joined to each other to form a cylindrical hole and a frusto-conical hole;
A handle 20 is fixed to each semi-annular body 19, and a rod 22 having locking heads 21 at both ends is attached to the side flange 18 of each opposing semi-annular body 19.
is inserted, and a spring 23 is inserted in a compressed state between the side flange 18 and the locking head 21 on both sides of the rod 22, and the elasticity of the spring 23 causes each semi-annular body 19 to are pressed together.

Further, the automatic locking device 10 is supported by a support member 24 fixed to the box 15 so as not to move backward, and the annular pressing member 9 is connected to a set screw 28.
It is fixed to the tubular body 4 by.

In the figure, 25 is the female thread of the joint 6, and 26 is the female thread of the joint 6.
is the male thread at the end of unit rod 5, and 27
is a supporting ridge provided on the inner periphery of the rear end of the hollow piston 8 in order to improve the stability of the tubular body 4 within the center hole jack 3.

When the tubular body 4 is press-fitted into the ground, the center hole jack 3 is extended as shown in FIG. 1, and the rear end of the automatic locking device 10 is inserted as shown in FIGS. By engaging the threaded joint 6 at the rearmost part of the propulsion rod 7 and then shortening the center hole jack 3, the tubular body is 4 into the ground by the length of the jack stroke.

Next, when the center hole jack 3 is extended and the propulsion rod 7 is moved backward, as shown in FIG. The automatic locking device 10 engages with the shaped recess 17, and then the joint 6 resists the elasticity of the spring 23 and moves the semi-annular bodies 19 away from each other.
moving inside.

The moment the joint 6 passes the automatic locking device 10,
The elasticity of the spring 23 brings the semi-annular bodies 19 together, and the joint 6 is ready to engage with the rear surface of the self-locking device 10.

Note that the rearmost unit rod 5 may be removed after completing the press-fitting for the jack stroke.

Next, the center hole jack 3 is shortened again and the tubular body 4 is press-fitted, and the same operation is repeated to press-fit the tubular body 4 one after another.

After the tubular body 4 is press-fitted to a predetermined length, another tubular body is added to the rear end of this tubular body 4, and the center hole jack 3 is attached in the same manner as in the above case.
Press it in.

When carrying out this invention, as shown in FIG. 6, a propulsion rod 7 is formed by screwing together the required number of unit rods 5, which are integrally provided with a threaded joint 6 at the rear end and have a male thread 26 at the front end. Alternatively, in order to further facilitate the discharge of earth and sand within the tubular body 4, an annular pressing member 9 may be fitted on the outside of the tubular body as shown in FIG.

Cylinder 2 in center hole jack 3
Any means other than those shown may be used for fixing the automatic locking device 10 to the ground, and any structure other than those shown may be used as the automatic locking device 10.

This invention can be applied not only to the case of laterally press-fitting fluid transport steel pipes, steel sheath pipes, or other tubular bodies from underground recesses, but also to the case of press-fitting steel pipe piles, small-diameter caissons, etc. can do.

According to this invention, a tubular body 4 is fitted into a center hole jack 3 fixed to the ground 1, and a plurality of propulsion rods are constructed by connecting a plurality of unit rods 5 with a joint 6 having a larger diameter. A rod 7 is arranged around the tubular body 4, and the front end of the propulsion rod is fixed to the hollow piston 8 of the center hole jack 3, and the rear joint 6 of the propulsion rod 7 is connected to the tubular body 4. Since it is locked by an automatic locking device 10 provided around the annular pressing member 9 fitted to the rear end, the tubular body 4 can be propelled and press-fitted into the ground in a stable state using a simple device. Since the force acting on the propulsion rod 7 during thrust press-fitting is a tensile force rather than a compressive force, the propulsion rod 7 is burdened with a considerably large thrust and the tubular body 4 is
When the center hole jack 3 is extended after further propulsion for the jack stroke, the next joint 6 in each propulsion rod 7 engages the automatic locking device 10. The tubular body 4 can be pushed in almost continuously and quickly by repeatedly shortening and extending the center hole jack 3. I can go,
Furthermore, the disadvantage of the conventional construction method, which is the danger of spacers flying off, can be solved, and the propulsion work can be carried out safely in a narrow space. Furthermore, since the rear end of the tubular body 4 is largely open, When the earth and sand in the pipe is discharged from the rear part, the effect can be obtained such that the discharge can be easily carried out.

[Brief explanation of the drawing]

The drawings show embodiments of the invention,
Figure 1 is a longitudinal side view showing the state in which the preparation for press-fitting the tubular body is completed, Figure 2 is an enlarged vertical side view showing the vicinity of the propulsion rod locking part in Figure 1, and Figure 3 is the joint of the propulsion rod. FIG. 4 is an enlarged vertical side view showing some details of FIG. 2, FIG. 5 is a front view of the automatic locking device, and FIG. This figure is a longitudinal sectional side view showing another example of the joint portion of the propulsion rod, and FIG. 7 is a longitudinal sectional side view showing another example of the relationship between the annular pressing member and the tubular body. In the figure, 1 is the ground, 2 is the cylinder, 3 is the center hole jack, 4 is the tubular body, 5 is the unit rod, 6 is the joint, 7 is the propulsion rod, 8 is the hollow piston, 9 is the annular pressing member, and 10 is the automatic locking device,
12 is an anchor rod, 13 and 14 are nuts, 15 is a box, 17 is a semi-truncated conical recess,
19 is a semi-annular main body, and 23 is a spring.

Claims (1)

[Claims] 1. A plurality of propulsion rods constructed by fitting a tubular body 4 into a center hole jack 3 having a cylinder 2 fixed to the ground 1, and connecting a plurality of unit rods 5 with a joint 6 having a larger diameter. Rods 7 are provided at intervals in the circumferential direction of the tubular body 4 behind the center hole jack 3, and the front end of each propulsion rod 7 is fixed to the rear end of the hollow piston 8 of the center hole jack 3. , tubular body 4
Around the annular pressing member 9 fitted to the rear end,
Automatic locking device 1 that engages with the joint 6 that is moved rearward to expand and contract after passing through the joint.
1. A tubular body press-fitting device characterized in that a 0 is provided.