JPS6128080B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a horizontal boring machine composed of an outer tube and an inner tube each having a drilling bit at the tip, and is capable of controlling direction for laying small-diameter pipes. This article relates to a boring method and its equipment.

Horizontal boring machines currently used in various civil engineering works do not have a directional control function, so they tend to bend the hole, and the straight-line accuracy of drilling is 1/50 or less.
It is quite low, about 1/100. However, horizontal boring machines can handle everything from bedrock to soft cohesive soil.
Since it is possible to excavate all kinds of ground, if it is possible to improve the straightness of excavation, the range of its applications will be greatly expanded.

In recent years, when constructing small-diameter pipelines with strict gradient designs, such as sewerage systems, it is often not possible to use cut-and-cover construction methods due to road conditions and other ground constraints. It is hoped that a new laying method will emerge. In order to meet this demand, small diameter pipe installation methods such as iron molding have already been developed and implemented, but with this method,
Since the guide pipe is of a consolidated type, there are major limitations on the excavated soil quality and distance.

The present invention adds means for relatively changing the direction between the outer tube and the inner tube of a horizontal boring machine, and corrects the direction of the inner tube with the outer tube as a reference. By doing so, the present invention provides a directionally controllable boring method and its equipment that can lay small-diameter pipes with the same precision as iron molding methods and without being restricted by excavated soil quality or distance. .

Next, the construction method and the construction of the apparatus according to the present invention will be described with reference to an embodiment shown in the drawings.

In FIGS. 1 to 3, 1 is an outer pipe constituting a horizontal boring machine, and 2 is an inner pipe. Excavation bits 4 and 5 are attached to the tips of the outer tube 1 and the inner tube 2, respectively. Further, an excavation direction correction plate 6 is attached to the tip of the support member 3 in the outer tube 1 from one inner surface of the outer tube toward the center, and the inner edge of each plate is attached to the face side. It has a narrowing hypotenuse. On the other hand, on the outer periphery of the inner tube 2, an excavation direction correction cone 7, which is formed into a conical shape and has a generatrix parallel to the edge of the correction plate 6, is attached at a position corresponding to the excavation direction correction plate 6. These excavation direction correction plate 6 and cone 7 support the inner tube 2 at the excavation center position when they collide in a normal state. A positioning body 8 for the inner tube 2 is attached to the distal end of the outer tube 1, and a target 9 that can be seen through from the rear is attached to the distal end of the inner tube 2. Note that the target 9 may be equipped with a light emitting body such as a light emitting diode.

To perform excavation using the horizontal boring machine configured as described above, the outer tube 1 and the inner tube 2 are rotated, and the ground is excavated using the excavation bits 4 and 5. Send slime along with water to the shaft. And a certain length (50-100
cm) After drilling, stop the excavation and use a transit, level, laser transit, laser level, etc. to remove the target 9 from the boring shaft.
The amount of displacement and deflection from the excavation center line and its direction are measured using as a marker.

In this way, if the amount and direction of deflection of the excavation are confirmed, and it is found that the outer tube 1 is deflected upward in FIG. Position them at the same top. Then, when only the inner tube 2 is rotated and propelled, the cone 7 provided on the inner tube 2 collides with the oblique side of the inner edge of the correction plate 6, and is then wedged.
In response to the reaction force of the outer tube 1, the inner tube 2 is corrected in a direction opposite to the direction of deflection, and the tip of the inner tube 2 is excavated.

Next, pull back the inner tube 2 and its tip to a predetermined position where it hits the aligning body 8, align the inner tube 2 to a position slightly ahead of the outer tube 1, and rotate and excavate both at the same time, so that the inner tube 2 is in the lead position. The excavation direction of the outer pipe 1 is corrected. And a certain length (50~
After excavating (100cm), the excavation is temporarily interrupted and the deflection amount and its direction are measured in the same manner as described above. If there is any deflection, the excavation direction is corrected by additional digging, and the process of excavating a certain length is performed sequentially. By repeatedly excavating, horizontal boring can be performed on a predetermined line.

There are the following methods for laying small diameter pipes.

(1) This is a method of laying small-diameter pipes by directly using the outer pipe 1, and is applied to laying pipes for gas, electric wires, water supply, sewerage, etc.

(2) This is a construction method in which the outer pipe 1 is used as a sheath pipe and a small-diameter pipe is further laid, and is adopted for laying small-diameter pipes covered with gas, electric wires, etc.

(3) Use the outer tube 1 as a guide pipe and connect the tube body (steel tube, humid tube, armored steel tube, etc.) to the rear,
This is a construction method that is propelled by jacks, and is used for laying small-diameter pipes for gas, electric lines, water supply, sewerage, etc.

The pipe body connected to the rear can be a consolidation type that does not take in soil, a type that removes soil within the pipe using an auger or fluid transport, or a type that uses a small diameter auger inside the outer pipe 1 to discharge soil to the reaching shaft side. Various types can be adopted, such as a front-discharging type. In addition, instead of jack propulsion, P/C is installed inside the outer tube 1.
The tube may be propelled by pulling the tube from the front through a cable.

4 to 7 show other embodiments of the above-described embodiments, and parts designated by the same reference numerals as in FIGS. 1 to 3 have the same configuration. This embodiment is different in that the outer tube 1 is not provided with the alignment body 8, and the inner tube 2 is not provided with the excavation direction correction cone 7.

In digging by the horizontal boring machine of the other example, the outer tube 1 is rotated, the excavation bit 4 is used to excavate the ground, and the slime is sent to the shaft together with the water sent from the boring shaft. And a certain length (50-100
cm) After excavating, measure the meandering amount and direction from the excavation center line and correct the excavation direction using the following steps.

That is, first, the inner tube 2 is pushed out to the position of the excavation direction correction plate 6, and using the target 9 as a marker, the amount and direction of deflection from the center of excavation are measured from the boring shaft. Then, the outer tube 1 is rotated in the same direction as the direction to be corrected based on the measurement result, and after positioning the excavation direction correction plate 6, the inner tube 2 is rotated and the ground is excavated with the tip bit 5. Since Δδ and Δl are known, the amount δ to be corrected and the required penetration amount l are expressed as l=δ×Δl/Δδ.

Therefore, if the inner tube 2 is excavated and propelled by the required penetration amount l, and the outer tube 1 is excavated and propelled while leaving the inner tube 2 as it is, the outer tube 1 will move along the support member 3 (in other words, the inner tube 2 as a guide), the outer tube 1 is gradually oriented in a predetermined direction, and the deflection of the outer tube 1 is corrected. Thereafter, horizontal boring on a predetermined line is performed by sequentially repeating the steps of excavating a fixed length, measuring the deflection amount and its direction, and correcting the excavation direction.

As explained above, the present invention uses a horizontal boring machine composed of an outer tube and an inner tube each equipped with a drilling bit at the tip, and rotates the outer tube and the inner tube or outer tube to uniformly drill the ground. After long excavations, the amount of deflection of the tip of the inner tube with respect to the excavation center line is measured from the rear side of the propulsion, then only the inner tube is rotated, and its direction is corrected using a correction plate installed inside the outer tube. This is a directionally controllable boring method characterized by over-excavation in the opposite direction to the deflection direction and subsequent excavation using the over-excavation direction as a guide, and a device for implementing the same, so it is possible to use a horizontal boring machine. The accuracy of excavation straightness can be greatly improved, and it has the effect of being able to lay small-diameter pipes with the same accuracy as iron molding and other construction methods, without being restricted by excavated soil quality or distance. be.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a vertical side view of a horizontal boring machine, FIG. 2 is a vertical front view of the same, FIG. 3 is a vertical side view showing a mode of deflection correction, and FIG. Figure 4 is a longitudinal sectional side view of another embodiment;
FIG. 5 is a longitudinal sectional front view of the same as above, and FIGS. 6 and 7 are longitudinal sectional side views showing a deflection correction mode of the same. 1... Outer tube, 2... Inner tube, 3... Support member,
4, 5...Drilling bit, 6...Drilling direction correction plate, 7...Drilling direction correction cone, 8...Positioning body, 9...Target.

Claims (1)

[Claims] 1. Using a horizontal boring machine consisting of an outer tube and an inner tube each having a drilling bit at the tip, the outer tube and the inner tube or the outer tube are rotated to excavate a certain length of ground. After that, measure the deflection amount and deflection direction of the tip of the inner tube with respect to the excavation center line from the rear side of the propulsion, and then attach the excavation direction correction plate fixed to one side of the inner surface of the outer tube with the inner edge formed as an oblique side. By rotating, the excavation direction correction cone provided on the outer periphery of the inner pipe collides with the correction plate positioned in the deflection direction, and when only the inner pipe is rotated and excavated, the excavation direction of the inner pipe is changed to the outer pipe. The method is characterized in that the reaction force is taken to make the change, and after the inner tube performs over-digging in the correcting direction in advance of the outer tube tip, the inner tube and the outer tube are guided by the over-excavation and perform excavation. A boring method that allows direction control. 2. In a horizontal boring machine composed of an outer tube and an inner tube each having a drilling bit at the tip, the inner tube is supported at the center line position via a support member fixed inside the outer tube, and the above-mentioned support inside the outer tube is An excavation direction correction plate with an inner edge formed as an oblique side is fixed to one side of the inner surface of the tip end of the member, and an excavation direction correction cone is provided on the inner tube at a position corresponding to the correction plate, and A boring device capable of controlling direction, characterized in that a target is provided at the tip, and a generatrix of the correction cone abuts and wedges with the oblique side of the correction plate.