JP2008038400A - Pipe burying construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten distance of excavation without digging out up to the ground surface on the opposite side. <P>SOLUTION: After burying a rod 3 into an optional shape including a bent part in the ground by an excavation advancing head 2 capable of advancing into an optional direction, the rod 3 connected with its rear, and an excavation advancing machine 4, a reamer 5 is inserted into a terminal part of the rod, a pipe body 7 is connected with its rear through a joint 8, and the pipe body 7 is pushed into the ground by letting the reamer 5 advance by the excavation advancing machine 4 by using the rod 3 as a guide. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for embedding a tubular body in which a tubular body is embedded in an arbitrary shape including a bent portion in a lower part of a structure.

  For example, in order to improve the ground directly under the structure or embed the pipe body in the soil via the structure, conventionally, a vertical shaft is provided outside the structure and then drilled horizontally from here. In recent years, a digging head that can freely control the direction of travel has been developed in the United States, and by using this, a pipe can be embedded in an arbitrary shape including a bent portion without providing a shaft. It became possible. Patent Document 1 describes such a digging apparatus and a digging method using the digging apparatus.

  FIG. 3 is a conceptual diagram in the case of performing ground improvement at the lower part of the structure S using such an excavating machine 4, and when boring is started obliquely from the ground beside the structure S and a predetermined depth is reached. The direction of the digging head 2 is changed to the horizontal direction, and thereafter the boring is performed horizontally. Flexible connecting rods 3 are connected to the rear of the digging head 2 one after another.

  FIG. 4 is a cross-sectional view of an embodiment of the excavation head 2 described in Patent Document 1, wherein 21 is a jet nozzle, and 22 is a fluid path through which high-pressure fluid is supplied. The jet nozzle 21 is directed obliquely about 5 degrees with respect to the digging head 2. Accordingly, if the digging head 2 is moved forward while being rotated, the process proceeds in a straight line direction (head direction).

  FIG. 5 is an external view of the excavating machine 4 similarly described in Patent Document 1. 40 is a base, 41 is a forward frame that moves on the base, 42 is a motor for rotation, 43 is a chain, 44 is a motor for forward movement, 3 Is a rod which is a tube for advancing. The forward frame 41 is provided with a clamp for fixing the distal end portion of the rod 3 and a chuck for gripping and rotating the distal end portion of the connecting rod 3, and when the forward mechanism is combined with this, the forward rod 41 moves forward without rotating. Or move forward while rotating.

According to Patent Document 1, it is described that the current position of the digging head can be detected by the receiver by equipping the digging head 2 with a wireless transmitter and a directional antenna. It is described that an electrolytic transducer is incorporated in the detection of the inclination of the above.
Patent Document 2 describes a method of using the excavation head described in Patent Document 1 to improve the ground directly under the structure. This will be briefly described with reference to FIG.

S is a structure and G is a ground to be improved. As shown in (a), using a non-open-cutting boring machine (digging machine 4) provided with a flexible connecting rod 3 having the above-described digging head 2 at the tip, the structure S is directed obliquely downward. Drilling is started, the propulsion direction is turned horizontally at a predetermined position, then tilted upward, and drilled until reaching the ground surface on the opposite side to form a pilot hole P, as shown in FIG. 2 is replaced with a back reamer 5A, and the pilot hole P is conversely expanded toward the excavator 4 to form a main hole H, and a cable 9 is used to accommodate a chemical injection pipe. The cylindrical tube (buried main tube) 7 is pulled into the main hole H, the outer cylindrical tube 7 is pulled out, the chemical solution injection tube is left in the main hole H, the chemical solution is injected, and these operations are repeated. Improve the ground by infiltrating and solidifying the chemical solution throughout the target ground. C is a chemical supply device.
Japanese Patent Publication No. 61-257501 JP 2001-193050 A

  As described above, in the conventional method, since the excavation head is replaced with the back reamer, it is necessary to excavate the pilot hole once to the surface opposite to the excavator. However, this is not always necessary depending on the purpose. An object of the present invention is to realize an economical excavation method in which only an excavation head is reached to a required position and no further excavation is required.

  The present invention includes a digging head having a jet nozzle obliquely oriented with respect to an axis at the tip, a flexible rod connected to the rear of the digging head via a joint, and a distal end portion of the rod. After the rod is embedded in an arbitrary shape including a bent portion in the ground by a rotating excavator, a reamer is inserted into the end portion of the rod, and a tubular body is connected to the rear of the reamer via a joint. The pipe embedment method is characterized in that a reamer is dug by the excavating machine using the excavator as a guide and the pipe is pushed into the ground.

  According to the present invention, there are excellent effects that the excavation distance is shortened and the burial work of the pipe is made efficient.

Embodiments of the present invention will be described with reference to the drawings.
As a first step, as shown in FIG. 1 (a), an excavating machine 2 is used to push the excavation head 2 and the rod 3 connected to the rear thereof via a joint into the ground. The excavation head 2 has, for example, a fluid ejection hole oblique to the shaft at the tip as shown in FIG. 4 and can excavate in an arbitrary direction. The rod 3 is a steel pipe connected to the rear thereof. These are flexible rods such as steel bars and resin pipes, and are connected to the rear one after another as they dig. The excavator 4 is capable of moving forward and rotating the end portion of the rod as shown in FIG.

When the excavation head 2 reaches the destination point, the excavation is stopped, and as a second step, the reamer 5 is inserted into the end portion of the rod 3, and a pipe body 7 such as an embedded main pipe is connected to the rear of the reamer 5 via a joint 8. Link. And as shown in FIG.1 (b), it digs, rotating the reamer 5 with the digging machine 4 by using the rod 3 as a guide. 6 is a reamer rotating rod.
Details of the vicinity of the reamer at this time are shown in FIG. The reamer 5 has a conical shape, and a drilling blade 51 such as a spiral shape is provided on the surface, and a fluid ejection hole 52 is provided so that excavation can be performed while ejecting fluid. A tubular body 7 is connected to the rear via a reamer rotating rod 6 and a joint 8. 53 is a packing for preventing leakage of fluid.

  In the present invention, an advanced embedded rod is used as a reamer guide, so there is no need to dig up the pilot hole to the ground surface far away from the excavator. Since it suffices to embed the rod, the digging distance can be short, and embedment with a reamer (secondary digging) is also easy. The rod can be pulled back and collected. The digging head 2 may be left in the ground. For this reason, the connection part which connects the digging head 2 and the rod 3 is good to make it the structure which isolate | separates easily, for example by reversely rotating a rod.

It is explanatory drawing of the embedding construction method of the pipe body of an Example. It is detailed sectional drawing which shows the reamer vicinity of an Example. It is a conceptual diagram of the embedding construction method of the pipe body in a prior art. It is sectional drawing of the excavation head in a prior art. It is a perspective view of the excavator in the prior art. It is explanatory drawing of the embedding construction method of the pipe body in a prior art.

Explanation of symbols

2 digging head 3 rod 4 digging machine 5 reamer
5A Back reamer 6 Reamer rotating rod 7 Tubing (outer tube)
8 Joint 9 Cable 21 Jet nozzle 22 Fluid path 40 Base 41 Advance frame 42 Rotation motor 43 Chain 44 Advance motor 51 Blade 52 Fluid ejection hole 53 Packing C Chemical solution supply device G Improvement target ground H Main hole P Pilot hole S Structure

Claims (1)

  An excavation head having a jet nozzle oblique to the shaft at the tip, a flexible rod connected to the rear of the excavation head via a joint, and an excavator for advancing and rotating the end portion of the rod After the rod is embedded in an arbitrary shape including a bent portion in the ground, a reamer is inserted into the end portion of the rod, a pipe is connected to the rear of the reamer via a joint, and the rod is used as a guide. A pipe embedding method characterized by digging a reamer with an excavator and pushing the pipe into the ground.

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