JPS6052252B2 - Drain installation method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drain pouring method and a drain pouring device in the drain method, which consolidates and improves soft ground by inserting a drain material into the soft ground and removing underground moisture. It is something.

The applicant first pushes the casing into the ground to a predetermined depth while rotating the casing, and inserts into the casing a rod with an anchor to which the tip of the drain material is fixed, and the anchor is inserted into the casing to the desired depth. After penetrating to a depth of JP-A No. 56-34816).

However, in this method, after excavation with the casing is completed, a rod with an anchor secured to the drain material is manually inserted into the casing, leaving the casing in the soil, and the resistance causes the rod to When it became impossible to insert the casing, the spindle chuck of the poling device used to push the casing was removed from the casing and replaced with the rod, and the rod was press-fitted into the ground to the desired depth by the poling device.

That is, in this first method, the process of excavating with the casing and the process of pushing the drain material into the ground with the rod had to be carried out separately, resulting in a long construction period. Furthermore, if a rod carrying drain material is inserted into the casing during the rotary excavation process using the casing, the drain material may come into contact with the inner wall of the rotating casing, resulting in damage to the drain material.
Alternatively, the drain material may become entangled with the rod, making it impossible to cast the drain material underground. The present invention has been made to solve the above-mentioned problems, and its purpose is to further improve the efficiency of drain material casting compared to the first method. Embodiments of the present invention will be described below with reference to the drawings. In the figure, 1 is underground where the drain material is to be placed, 2 is a hollow cylindrical casing used for rotary excavation of the ground 1 in order to place the drain material, and 3 is installed at the tip of the casing 2. 4 is a rod for inserting a drain material, 5 is a partition provided at the tip of the rod 4,
Reference numeral 6 denotes several injection pipes (five in this example) installed inside the partition wall 5 so as to penetrate the peripheral wall of the rod 4, and each of the tip openings thereof is oriented forward along the axis of the rod 4. ing. Reference numeral 7 denotes a stay for fixing the tip of the injection pipe 6 to the rod 4.

Reference numeral 8 denotes an anchor that is detachably fitted to the tip of the rod 4, and has a constricted portion formed in its body.

Reference numeral 9 denotes a cardboard-like drain material, which is provided along the rod 4 in FIG.

In the device of the present invention, an inner tube 12 is rotatably provided inside a rotary excavation casing 2 having a bit 3 at the tip via a plurality of ball bearings 11, and the inner tube 12 is rotated from the installation position of each ball bearing 11. Seals 1 to prevent the entry of excavation scraps, etc. at both outer end positions in the longitudinal direction
3, and the excavation casing has a double pipe structure in which the outer pipe 2 and the inner pipe 12 are relatively rotatable.

Next, a method for placing a drain according to the present invention using the casing device for placing a drain constructed as described above will be described.

That is, in this embodiment, as shown in FIG. 3, a polling machine 14 is installed on the ground 1, and the above-mentioned double-tube structure casing 2 is inserted into the spindle 15 of the polling machine 14 to remove the tip of the spindle 15. The outer tube 2 of the casing is fixed by a chuck 16 provided in the casing, and the outer tube 2 is pushed into the ground of the ground 1 while being rotated and excavated. As shown in Figure 1, before the excavation to the specified depth is completed,
A rod 4 having an anchor 8 fitted to the tip end of a drain material 9 is inserted into the inner pipe 12 of the casing 2, and the rod 4 is pushed forward as the casing 2 is rotated to excavate.

The rod 4 can normally be easily inserted into the inner tube 12 by hand, but if the insertion becomes difficult due to clogging, the rod 4 may be inserted mechanically.

Reference numeral 17 in FIG. 3 is a mount installed on the ground 1, and 18 is two sets of jacks installed on the mount 17. As shown in FIGS. 4 and 5, the piston rod 18a of each jack 18 is A rod holding member 19 provided at the tip of the rod 4 is held and pushed forward.

It goes without saying that the rod 4 can be easily operated using a small winch (not shown) or the like. Also, if necessary when pushing the rod 4, the rod 4
By connecting the outer end of the rod 4 to a compressor (not shown) via a swivel (not shown) and supplying pressurized air for removing waste, pressurized air is sent from the injection pipe 6 provided at the tip of the rod 4 to the face. If you spray it on the water, it will be easier to remove the waste.

In this case, pressurized water may be used instead of pressurized air. As described above, while excavating by rotating the casing 2, the rod 4 is pushed forward until the anchor 8 reaches the desired depth, and then the casing 2 and the rod 4 are pulled out with the anchor 8 remaining underground, thereby draining. The material 9 is left underground as shown in FIG. According to the present invention, as described above, since the drain material 9 can be inserted through the rod 4 during rotary excavation of the casing 2, most of the drain material 9 is also at a predetermined depth when the excavation of the casing 2 is completed. has reached.

Therefore, according to the present invention, the efficiency of drain material casting work can be significantly improved. Furthermore, the casing used in the present invention has a double tube structure, and even if the outer tube 2 rotates, the inner tube 12 does not need to rotate.
There is no risk that the drain material 9 inserted therein will be damaged or entangled with the rod 4. Further, since the space between the outer tube 2 and the inner tube 12 is sealed by the seal 13, the function of the bearing 11 will not be impaired by the intrusion of shear, muddy water, etc.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a casing device for drain casting of the present invention, Fig. 2 is a sectional view taken along line A-A thereof, and Fig. 3 is an elevational view showing an embodiment of the drain casting method of the present invention. FIG. 4 is a partial plan view thereof, FIG. 5 is a detailed view thereof, and FIG. 6 is a sectional view showing the state in which drain material is left. 1... Earth, 2... Casing (outer pipe), 3... Bit, 4... Rod for drain material insertion, 5... Partition wall , 6... Injection pipe, 7
...Stay, 8...Anchor, 9...
...Drain material, 10...Cable, 11...
...Ball bearing, 12...Inner tube, 13...
... Seal, 14 ... Polling machine,
15... Spindle, 16... Chuck, 17... Frame, 18... Jack, 1
9...Rod holding member.

Claims (1)

[Claims] 1. When pouring drain material in a substantially horizontal direction using a boring machine, the outer pipe of the casing, which is a relatively rotatable double pipe, is pushed into the ground while rotating. Before the excavation to the depth is completed, a rod with an anchor fixed to the tip of the drain material fitted to the tip is inserted into the inner pipe of the casing, and the rod is pushed forward as the casing rotates to excavate. After the anchor reaches a desired depth, the casing and rod are pulled out with the anchor left in the ground, thereby leaving the drain material in the ground. 2. An inner tube is rotatably provided inside a rotary excavation casing having a bit at the tip via a plurality of bearings, and seals are provided at both end positions outside the inner tube in the longitudinal direction from the installation position of these bearings. A casing device for drain pouring, characterized in that the casing for excavation has a double pipe structure in which an outer pipe and an inner pipe are relatively rotatable.