JPH0552092A - Water pressure jet type shield construction method and excavating head thereof - Google Patents

Abstract

PURPOSE:To provide a water pressure jet type shield construction method and an excavating head using no hydraulic jack, requiring no construction of a reaction wall, facilitating the temporary construction work, having high precision of directivity and a high excavating speed, capable of sharply shortening the construction period, having a low construction cost, and suitable for burying a long pipe with the diameter of about 70-250mm in particular. CONSTITUTION:An advanced gallery 30 is excavated from a starting shaft 20 to an arrival shaft 21 in advance by a horizontal boring machine, then a wire 7 is connected to the tip of the rod of the horizontal boring machine. The rod is returned to the starting shaft 20, the wire 7 is inserted into the advanced gallery 30, an excavating head 1 is connected to the tip of the wire 7 at the starting shaft 20 side, and a buried pipe 4 is connected here. A winding winch is operated to tow the excavating head 1 by the wire 7, and high-pressure water 19 is jet-injected from the injection nozzle 14 of the excavating head 1 to excavate a hole 30. Air is fed from an air feed pipe 13 to discharge slurry 39 to the outside through the buried pipe 4, the ground is excavated in sequence, and the pipes 4 are buried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a shield construction method in which high pressure water is jetted from a jet nozzle provided at the tip of the excavation head while pulling the excavation head with a wire inserted in an advanced pit to sequentially excavate the pipe and at the same time bury a pipe. And a drilling head used therefor.

[0002]

2. Description of the Related Art When a sewer pipe is buried in the ground, a digging method is generally used in which a trench is previously excavated and then the sewer pipe is buried. However, sewage systems are mainly small-scale and branch-type sewage pipes, and the construction of small-diameter pipes with large soil cover is increasing. Moreover, this excavation method requires large-scale temporary construction work, which also affects the surrounding environment such as roads and residential land. The shield method is used in some parts because it is large.

As a conventional shield method generally used, there is, for example, an iron molding method. After forming a vertical groove, a sheet pile is driven into this wall surface to form a square tubular reaction force wall, and this reaction force wall supports the hydraulic jack. After forming a pit, a fume pipe with a nozzle attached to this advanced pit is press-fitted with a hydraulic jack and buried.

However, this iron molding method is
It is necessary to drive a sheet pile that is twice as long as the depth of the vertical groove to construct a rectangular reaction wall, and a large crane must be used to drive the sheet pile. Moreover, the hydraulic jack that press-fits a large-diameter fume pipe is large because it requires a large hydraulic pressure, and the vertical groove for installing this is also large, and a large hydraulic pump is installed to generate a hydraulic pressure of 200 tons or more. I had to do it. For this reason, there is a drawback that the temporary construction becomes large, the construction period becomes long, and the construction cost becomes high.

When embedding a small-diameter pipe, the OKMALL construction method has been widely used. This method is a method to press the buried pipe with a hydraulic jack after excavating the advanced mine with an auger screw, but since this also uses a hydraulic jack, a reaction wall is constructed and a large hydraulic pump is installed. There is a drawback that the construction period must be long and the construction cost must be high.

In addition to this, as a shield construction method for burying a small-diameter pipe, a mud-water construction method in which softened soil is excavated by a cutter while water is supplied is also used. However, this muddy water method also has a drawback in that a reaction wall is required because a hydraulic jack is used, and the directionality is poor because the advanced mine is not excavated.

[0007]

DISCLOSURE OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, does not use a hydraulic jack, does not require construction of a reaction force wall, is easy to perform temporary construction, and has high directional accuracy and high excavation speed, It is an object of the present invention to provide a hydraulic jet type shield construction method suitable for burying a pipe with a diameter of 70 to 250 mm and an excavating head used for this, which can significantly reduce the construction period compared to the conventional construction and is inexpensive It is a thing.

[0008]

According to a first aspect of the present invention, after forming a starting pit and a reaching pit, an advanced pit is slightly larger than a wire outer diameter in a horizontal boring machine from the starting pit to the reaching pit. After connecting the wire of the hoisting winch installed on the reaching pit side to the rod tip of the horizontal boring machine reaching the reaching pit, return the rod of the horizontal boring machine to the starting pit side and put the wire inside the advanced pit. After inserting, then connecting the drilling head to the tip of the wire that reached the starting pit and connecting the buried pipe to the drilling head, while winding the wire of the hoisting winch installed on the arrival pit side and pulling the drilling head, Water pressure is supplied to the drilling head, high-pressure water is jetted from the jet nozzle at the tip for drilling, and at the same time air is supplied to the drilling head, A hydraulic jet shield tunneling, characterized by drilling while the interior of mud cutting head leading end of the hole is discharged to the starting pit side through buried pipes pneumatically.

Further, according to the second aspect of the invention, a jet bar is provided at the tip and a guide rod provided with a wire connecting portion is connected to the tip of a cylinder having a connecting portion for the buried pipe provided at the rear end.
A partition wall is formed in the cylinder, and a high pressure water supply pipe communicating with the high pressure pump and an air supply pipe communicating with the compressor are attached through the partition wall, and an injection nozzle is attached to the tip of the high pressure water supply pipe. The excavating head is characterized in that the tip of the air supply pipe is arranged at a muddy water discharge port opened to the partition wall.

[0010]

In the hydraulic jet type shield construction method of the present invention, first, the starting pit and the reaching pit are dug at the manhole position. Next, after installing the mounts equipped with hoisting winches at the starting pit and the reaching pit respectively, excavate toward the reaching pit side with the horizontal boring machine provided on the starting pit side, and slightly excavate the wire outside diameter. Drill an advanced mine. When the tip of the rod of the horizontal boring machine reaches the reaching pit in this way, the tip of the wire wound around the hoisting winch installed here is connected to the tip of the rod.

After that, when the horizontal boring machine is reversed and returned inside the advanced mine, the wire is unwound from the hoisting winch on the arrival pit side and guided into the advanced mine. When the rod returns to the starting shaft side in this way, the wire connected to this tip is removed.

Next, the tip of this wire is connected to the guide rod of the excavation head and the guide rod is inserted into the advanced shaft. Also, the high-pressure water supply pipe is connected to the high-pressure pump via the high-pressure hose, the air supply pipe is also connected to the compressor via the high-pressure hose, and these high-pressure hoses are passed through the buried pipe,
The buried pipe is fitted and connected to the pipe connecting portion of the drilling head.

Next, the hoisting winch installed in the reaching pit is operated to wind up the wire, and the excavation head connected to the tip of the wire inserted in the advanced pit is pulled. At the same time, when the high-pressure pump is operated, the water in the tank is sucked and compressed, and the obtained high-pressure water is supplied to the jet nozzle of the excavating head through the high-pressure hose.

The high-pressure water jetted from this jet nozzle is jet-jetted into the ground from the jet outlet, and the hole can be excavated at a high speed with an inner diameter slightly larger than the outer diameter of the excavating head.
In addition, compressed air is supplied from the compressor to the air supply pipe and is exhausted rearward from the muddy water discharge port, so the suction action works due to the flow of compressed air, and the muddy water inside the hole excavated with high pressure water is The muddy water is discharged from the muddy water discharge port together with the compressed air, is discharged into the start pit through the buried pipe, and this muddy water is pumped to the ground by the pump. In this way, the pipes are successively moved forward and buried while the excavation head is moved forward.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to FIGS. In the figure, reference numeral 1 denotes an excavation head, which has a tapered ejection port 3 whose inner diameter increases toward the tip at the inner peripheral edge of the tip of a cylinder 2 and a buried pipe 4 at the rear end.
Is a connecting part 5 for fitting and connecting. Reference numeral 6 denotes a guide rod formed in a round bar shape, and a round hole-shaped wire connecting portion 8 for connecting the wire 7 is provided at the tip of the guide rod. Further, the guide rod 6 is connected to the ejection port 3 of the cylinder 2 through four guide blades 9 provided in a cross shape on the ridgeline of the quadrangular pyramid at the rear portion of the guide rod 6, and a space is provided between the guide blades 9. Ten…
Are formed.

A partition wall is provided inside the cylinder 2.
11, a high-pressure water supply pipe 12 and an air supply pipe 13 are attached so as to penetrate therethrough, and an injection nozzle 14 for injecting high-pressure water 19 in a full cone shape is attached to the tip of the high-pressure water supply pipe 12. ..
Further, a small diameter pipe is penetrated and connected to the partition wall 11 to form a muddy water discharge port 15. The muddy water discharge port 15 is attached so that the U-shaped curved tip of the air supply pipe 13 is positioned. Further, on the back surface of the partition wall 11, a wire connecting portion 17 for connecting the pullback wire 16 is connected.
Is projected.

A hydraulic jet type shield construction method using the above excavation head will be described. Since the manhole of the sewer is usually separated by about 50 m, first, the starting pit 20 and the reaching pit 21 are dug at the manhole position as shown in FIG. Next, mounts 24 and 24 having hoisting winches 22 and 23 attached to the starting pit 20 and the reaching pit 21, respectively, are installed. Furthermore, the stand 24 of the starting pit 20
A horizontal boring machine 25 is attached to the high pressure pump 26, and a high pressure pump 26 is attached to the horizontal boring machine 25. Further, a tank 27 and a compressor 28 connected to the high pressure pump 26 are installed on the ground.

Next, an auger rod 29 is attached to the horizontal boring machine 25 provided on the side of the starting pit 20 and excavation is performed toward the side of the reaching pit 21. The auger rod 29 is provided with screw-shaped blades and is adapted to be excavated while rotating. In this way, the advanced pit 30 having a diameter slightly larger than the outer diameter of the wire 7 is excavated. When the auger rod 29 reaches the reaching pit 21, as shown in FIG. 4, the tip of the wire 7 wound around the winding winch 23 installed here is guided by the height adjusting pulley 31 and connected to the tip of the auger rod 29. To do.

After that, when the auger rod 29 is reversed and returned inside the advanced pit 30, the wire 7 is unwound from the winding winch 23 and guided into the advanced pit 30, as shown in FIG. When the auger rod 29 returns to the starting pit 20 in this manner, the wire 7 connected to this tip is removed.

Next, as shown in FIG. 7, the wire 7 is connected to the wire connecting portion 8 at the tip of the excavation head 1 provided in the starting pit 20 and the guide rod 6 is inserted into the advanced pit 30. Further, a high pressure hose 32 which is slightly longer than the buried pipe 4 is connected to the high pressure water supply pipe 12, and a high pressure hose 32 which is slightly longer than the buried pipe 4 is connected to the air supply pipe 13. Furthermore, a wire 16 for pulling back, which is slightly longer than the buried pipe 4, is also connected to a wire connecting portion 17 attached to the partition wall 11. After that, the high-pressure hose 32 and the pullback wire 16 are passed through the inside of the first embedded pipe 4, and the tip thereof is fitted and connected to the pipe connecting portion 5 at the rear end of the cylinder.

A pressing cap 34 is fitted on the rear end of the first buried pipe 4. In this presser cap 34, a truncated hollow conical wedge support 36 is fixed to the center of a horizontal plate 35, and a truncated hollow conical wedge 37 having a plurality of slits formed inside is fitted into the wedge cap 37. By inserting the pullback wire 16 into the wedge and fitting the wedge 37 to the wedge support 36, the pullback wire 16 is fixed because the inner diameter is small, and the buried pipe 4 is integrated with the excavation head 1. It is designed to move.

Next, as shown in FIG. 6, the high pressure hose 32 connected to the high pressure water supply pipe 12 is connected to another high pressure hose 32 connected to the high pressure pump 26 by a connector 33. Also air supply pipe 13
The high pressure hose 32 connected to is connected to another high pressure hose 32 connected to the compressor 28 with a connector 33.

Next, a hoisting winch installed at the reaching pit 21
23 is operated to wind up the wire 7, and the excavation head 1 connected to the tip of the wire 7 inserted in the advanced pit 30 is pulled. At the same time, when the high-pressure pump 26 is operated, the water in the tank 27 is sucked and compressed, and the obtained high-pressure water 19 is supplied to the injection nozzle 14 of the excavating head 1 through the high-pressure hose 32.

High-pressure water 19 jetted from this jet nozzle 14
As shown in FIG. 7, it becomes a full cone shape and is jetted into the ground from the jet port 3 to excavate. The inner diameter of the hole 38 to be excavated is adjusted by adjusting the water pressure and water amount of the injected high-pressure water 19, the nozzle shape, the inner diameter of the ejection port 3 and the Tepper angle, and the inner diameter is slightly larger than the outer diameter of the cylinder 2 for high speed. Can be drilled. Further, since compressed air is supplied from the compressor 28 to the air supply pipe 13 and is exhausted from the muddy water discharge port 15, the suction action is exerted by the flow of the compressed air, and the inside of the hole 38 excavated with the high pressure water 19 is The muddy water 39 is discharged together with the compressed air from the muddy water discharge port 15, passes through the buried pipe 4, and is discharged into the start pit 20. The muddy water 39 is pumped to the ground by a pump (not shown).

In this way, the high pressure water 19 is jetted in a full cone shape by the excavating head 1 while being pulled by the wire 7 to move forward, and the first buried pipe 4 is slightly left in the starting pit 20. Then, the hoisting winch 23, the high pressure pump 26 and the compressor 28 are stopped. After this, remove the wedge 37 and loosen the pull-back wire 16, and then press the cap 34
Is removed from the buried pipe 4. Also, the high pressure hoses 32, 32 that are connected are separated by disconnecting the connectors 33, 33, respectively. Next, the high-pressure hose 32 for supplying high-pressure water and the high-pressure hose 32 for supplying air, which are connected to the drilling head 1, are respectively buried in the pipes 4.
And another high-pressure hose 32 having substantially the same length as that of the buried pipe 4 are connected to the pulling wire 16 connected to the drilling head 1 with another pulling wire 16 having substantially the same length as the buried pipe 4. Are connected with U bolts 40.

Next, the second embedded pipe 4 is connected to the rear end of the first embedded pipe 4 with a rear portion of about 50 cm remaining, via a rubber ring, and the newly connected high pressure hoses 32, 32 are connected to the inside. Insert the wire 16 for pulling back. After this,
As shown in FIG. 6, the pressing cap 34 is fitted to the rear end of the second embedded pipe 4. Similar to FIG. 7, the pull-back wire 16 is inserted into the wedge support 36 and the wedge 37 of the pressing cap 34, and then the wedge 37 is fitted to fix the wire 16.

After that, the hoisting winch 23, the high-pressure pump 26 and the compressor 28 are activated again, and the wire 7 is also pulled to excavate the length of one of the buried pipes 4 while looking horizontally at the laser level. The same operation is repeated thereafter to excavate while sequentially connecting the buried pipes 4 ... Further, since the present invention excavates with a hydraulic jet that is ejected in the form of a full cone, the excavated hole 38 has a small opening ratio and is slightly larger than the outer diameter of the cylinder 2, and the buried pipe 4 is in a consolidated state. And there are almost no voids. In this way, when the excavation head 1 reaches the reaching pit 21 and the buried pipe 4 is buried over the entire length, the excavation head 1 is removed here to complete the construction.

When hitting a stone or the like buried in the ground or when the excavation direction is shifted, the hoisting winch 22 on the starting pit 20 side is driven to wind up the wire 16 for pulling back and excavating. The head 1 is returned.

In the above-mentioned embodiment, the case where the buried pipe 4 of about 2 m is connected and excavated is shown. However, when a flexible long corrugated pipe is buried, a long high-pressure hose 32 and a pull-back pipe are preliminarily provided. It suffices to insert the wire 16 in the corrugated pipe. Further, the present invention is not limited to the case of burying a sewer pipe, but can be widely applied to bury a water pipe or an electric wire burying pipe.

[0030]

As described above, according to the hydraulic jet type shield construction method and the excavating head according to the present invention, an advanced pit slightly larger than the wire is previously digged by the horizontal boring machine and wound on the hoisting winch on the reaching pit side. After inserting the wire into the advanced mine, connect the wire to the drilling head connected to the buried pipe, and while pulling the drilling head with the wire, jet high-pressure water from the jet nozzle of the drilling head to drill the hole. Since muddy water is excavated while supplying air and discharging it to the outside, temporary construction is easy because there is no need to construct a reaction wall without using a hydraulic jack, and the directionality is high and the excavation speed is high. The construction period can be shortened to one-third faster than before, construction costs are low, and the diameter is 70
It is suitable for embedding a pipe of about 250 mm long.

[Brief description of drawings]

FIG. 1 is a sectional view showing a drilling head according to an embodiment of the present invention.

2 is a sectional view of the excavating head shown in FIG. 1 taken along the line AA. FIG.

FIG. 3 is an explanatory view showing a state where an advanced pit is being excavated by a horizontal boring machine by the method of the present invention.

FIG. 4 is an explanatory view showing a state in which a wire is connected to the tip of a horizontal boring machine that has reached the reaching pit by the construction method of the present invention.

FIG. 5 is an explanatory view showing a state in which the horizontal boring machine is returned to the starting pit and the wire is inserted into the advanced pit by the construction method of the present invention.

FIG. 6 is an explanatory diagram showing a state in which a pipe is buried by excavating the excavation head while pulling the excavation head with a wire according to the method of the present invention.

FIG. 7 is an enlarged sectional view showing the excavation head portion of FIG.

[Explanation of sign]

 1 Excavation head 2 Cylinder 3 Jet port 4 Buried pipe 5 Pipe connecting part 6 Guide rod 7 Wire 11 Partition wall 12 High pressure water supply pipe 13 Air supply pipe 14 Injection nozzle 15 Muddy water discharge port 19 High pressure water 20 Start pit 21 Arrival pit 22 Winding up Winch 23 Hoisting winch 24 Frame 25 Horizontal boring machine 26 High pressure pump 28 Compressor 29 Auger rod 30 Advanced mine 32 High pressure hose 34 Presser cap 38 Hole 39 Mud

Claims (2)

[Claims] 1. After forming a starting pit and a reaching pit, a horizontal boring machine is used to excavate an advanced pit slightly larger than the outer diameter of the wire from the starting pit to the reaching pit, and a rod tip of the horizontal boring machine reaching the reaching pit. After connecting the wire of the hoisting winch installed on the arrival pit side, return the rod of the horizontal boring machine to the starting pit side and insert the wire into the advanced pit, and then the drilling head at the tip of the wire that reached the starting pit. After connecting the buried pipe to the excavating head and winding the wire of the hoisting winch installed on the reaching pit side and pulling the excavating head, supply high pressure water to this excavating head and supply high pressure from the jet nozzle at the tip. At the same time as jetting water to excavate, the air is supplied to the excavating head, and the muddy water inside the hole at the tip of the excavating head is pneumatically driven. A hydraulic jet type shield construction method characterized by excavating while discharging to the start pit side through a buried pipe. 2. A guide rod provided with a wire connecting portion is connected to the tip of a cylinder having a jet opening opened at the tip and a connecting portion for a buried pipe provided at the rear end, and a partition wall is formed in the cylinder. Install a high-pressure water supply pipe communicating with the high-pressure pump and an air supply pipe communicating with the compressor, penetrating and attaching an injection nozzle to the tip of the high-pressure water supply pipe. An excavation head, which is arranged at a muddy water discharge port that opens at the bottom.