JP2013130001A - Pipe body support device - Google Patents

Abstract

Provided is a pipe support device for preventing an excavator and a propulsion pipe from rising or northing down in a starting pit during propulsion construction.
In order to maintain the center and level of the excavator and the propulsion pipe 10 in the start shaft, the bottom of a ruler provided in the propulsion direction on both sides below the excavator and the propulsion pipe 10 is provided. Propulsion stand 5 in which a plurality of sleepers 7 are fixed at right angles to the propulsion direction, and the upper cross beam 2 and the left and right support pillars 3 are connected to the cross beam so as to surround the excavator and the propulsion pipe 10 in the propulsion direction behind the start pit wall. A fixed frame 1 assembled in a shape, a metal brace 8 provided to abut the outer surface of the excavator or the propulsion pipe 10 below the transverse beam 2 of the fixed frame 1, and an intermediate between the left and right support columns 3 of the fixed frame 1 The fixing frame 1 is fixed to the propulsion base 5 or the bottom plate concrete of the shaft, and is installed in at least one place.
[Selection] Figure 1

Description

  The present invention relates to a tubular body support device for preventing an excavator and a propulsion pipe in a starting vertical shaft from rising and nosing during propulsion.

  In the propulsion work, the propulsion stand installed in the start shaft is for installing the excavator and the propulsion pipe in the specified direction, gradient, and height, and is provided on the sleeper at the bottom and both sides below the pipe. The basic structure is supported by three points of the pair ruler. With the main push jack installed behind the start shaft, the excavator and the propulsion pipe are pushed out into the ground through the start wall of the start shaft provided in the front, and propelled in a predetermined direction by supporting the three points of the propulsion platform described above. It will be buried. In normal high-quality ground, the excavator and the propulsion pipe are guided in the correct direction by the propulsion platform, so they pass through the center of the start pit wall without starting off the outer surface of the excavator and the propulsion pipe. The water-stopping rubber installed on the wall of the wellhead will evenly contact the entire circumference, preventing groundwater and earth and sand from flowing into the starting shaft. However, if the soil condition is weak, the ground cannot support the excavator and the propulsion pipe, and the excavator and the propulsion pipe that have come out of the starting shaft into the ground will sink or float due to the buoyancy of the groundwater. Thus, the center position of the starting pit wall is also shifted and the groundwater and earth and sand are ejected from the outer peripheral surface of the propulsion pipe. Also, in the case of alternating layer ground at the initial start, the excavator deflects toward the higher strength ground due to the difference in upper and lower ground strength, and similarly, the excavator position shifts from the center of the start pit mouth wall and groundwater and There was a problem that eruption of earth and sand occurred.

For this reason, during propulsion, in order to prevent the excavator and propulsion pipe from rising and nosing down in the starting shaft, it is wound around the outer peripheral surface of the excavator and propulsion pipe using a wire rope, and both lower ends thereof A tube support method has been adopted in which the frame is tightened with a chain block or the like. In the method of winding the direct wire rope around the pipe body or the like, the wire rope fastened to the pipe body is advanced together with the advancement of the pipe body, and the wire rope is placed in the start well wall provided in the front of the start shaft. -There has been a problem that the rope bites in and the above-mentioned water-stopping rubber is caught and broken, or the propulsion base is damaged by pulling in the wire rope.

Therefore, a method of arranging a plurality of square bars in the circumferential direction in the propulsion direction, winding a wire rope from above the square bars, and fastening both lower ends with a chain block or the like has come to be frequently used. It was. The tip of the above-mentioned square bar is installed so as to abut on the concrete surface of the start pit wall, and even if the tubular body moves forward by propulsion construction, the tip of a plurality of square members is the concrete surface of the start pit wall. Therefore, the wire rope and the like do not move forward together with the tube body and are held in place.

With the above-described tube support device, the wire rope does not get caught in the start well wall, but the square member surface that comes into contact with the outer surface of the propelling tube is worn or chipped by repeated sliding. As a result, the wire rope tightening force is weakened and the propulsion pipe or the like is lifted. Further, when the pipe diameter is increased, a large tightening force is required, and the wire rope bites into the square member surface, the tightening force is reduced, and the propulsion pipe is lifted. Furthermore, when the excavator or propulsion pipe that has gone underground from the start shaft is subsided, the pipe support device provided only at one location behind the start well wall will excavate behind the tube support device. There is a problem in that the machine and the propelling pipe are lifted free, causing deviation from the starting pit wall and poor accuracy.
Japanese Patent Laid-Open No. 2003-41886

  For this reason, the problem to be solved by the invention is that the excavator and the propulsion pipe in the start shaft are prevented from rising and nose down of the excavator and the propulsion pipe pushed into the ground in front of the start shaft during the propulsion work. It is intended to provide a tube support device that reliably supports a fixed position so as not to float up.

The present invention is a tubular body support device for preventing an excavator and a propulsion pipe from rising and northing down in a start shaft during propulsion construction,
In order to maintain the center and level of the excavator and the propulsion pipe in the starting shaft, the bottom of the ruler provided in the propulsion direction on both sides below the excavator and the propulsion pipe is perpendicular to the propulsion direction. A fixed stand in which a plurality of sleepers are fixed, a fixed frame in which upper horizontal beams and left and right support columns are assembled in a cross-beam shape so as to surround the excavator and the propelling pipe in the propulsion direction behind the starting pit wall, and the fixing Below the transverse beam of the frame, it is composed of a pressing bracket equipped to contact the outer surface of the excavator and the propulsion pipe, and an adjustment bracket provided in the middle of the left and right support pillars of the fixed frame. Alternatively, it is a tube support device that is fixed to the bottom plate concrete of the shaft and installed in at least one place.

  The propulsion stand installed in the starting shaft is composed of a plurality of sleepers arranged in a direction orthogonal to the propulsion direction and a pair of rulers fixed to the upper surface of the sleeper extending in the propulsion direction. As the ruler, a strong H-shaped steel material is generally used so as not to be deformed by the deflection force of the excavator or the propulsion pipe. Ribs and the like are fixed and reinforced at equal intervals on the web portions on both sides. Since the sleeper is repeatedly slid with the bottom of the propelling tube over a long period of time during the propulsion construction, H-shaped steel that is not easily worn is used.

  As the fixed frame, an H-shaped steel material having a strength capable of resisting the lifting of the excavator and the propulsion pipe is used. For the assembly and connection of the upper cross beam and the left and right support columns, generally used bolt and nut joints are used. A pressing member provided below the cross beam is attached to a plurality of pressing members in the circumferential direction at the tip of the pressing member and held in contact with the outer surface of the propulsion pipe. Further, it is also possible to use a metal fitting manufactured in a curved shape in accordance with the outer diameter of the propulsion pipe so that the press fitting is evenly in contact with the outer surface of the propulsion pipe. The adjustment brackets provided on the left and right support pillars are equipped with one horizontal fixture so that the horizontal beam pushers can evenly press against the outer surface of the excavator or propulsion pipe, and the vertical height can be adjusted. It has become. As a specific adjustment fitting, a screw jack or the like is used, and is connected to upper and lower support columns by bolts and nuts.

The lower ends of the left and right support pillars are fixed to the sleepers of the propulsion stand or fixed to anchors of the bottom slab concrete in the start shaft, so that the fixed frame cannot be moved vertically. By installing two fixed frames in the propulsion direction, it is possible to prevent the rear portion of the excavator and the propelling pipe from being lifted against the down of the excavator and the propelling pipe.

  The tubular body support device of the present invention can always secure the excavator and the propulsion pipe at a fixed position by the adjustment bracket of the fixed frame fixed to the sleeper of the propulsion base or the concrete bottom plate, and is buried in the ground. It is also surely prevented against lifting that acts on the propulsion pipe. In addition, even against a nose down of an excavator etc. under soft soil conditions, the rear of the excavator main body is lifted by the rear fixed frames installed at two or more locations in the propulsion direction, resulting in inaccuracy and the like. There is nothing. For this reason, the excavator and the propulsion pipe slide on a fixed position on the propulsion stand, and always pass through the center of the starting pit wall, and the entire peripheral surface outside the excavator and the propulsion pipe is equal to the waterproof rubber. It is in a state where it is in contact with the surface, and safe and reliable propulsion can be performed.

  A pipe support device that allows safe and reliable propulsion work while always maintaining the planned route position without causing the excavator and propulsion pipe installed in the start shaft to float or go down the north during propulsion work. It was realized.

  FIG. 1 is a cross-sectional view illustrating a tube body support device of the present invention. At the lower end of a pair of rulers 6 extended in the propulsion direction, a propulsion stand 5 in which a plurality of sleepers 7 extending perpendicularly to the propulsion direction are fixed in the propulsion direction is located on the bottom plate concrete of the start shaft Is installed. The propulsion pipe 10 is installed on the propulsion base 5 so as to abut on both lower side surfaces. In the present embodiment, there is no support at the sleeper wood portion depending on the installation conditions of the main push jack, and the support is only by two points of a pair of ruler portions. Both sides of the propulsion pipe 10 are equipped with an adjustment fitting 4 that can be adjusted in the vertical direction in the middle, and a support column 3 whose lower end is fixed to the sleeper 7 of the propulsion stand 5 by bolts and nuts, and both supports A fixed frame 1 composed of a cross beam 2 fixed by bolts and nuts so as to connect the upper ends of the columns 3 surrounds the propulsion pipe 10. At the center lower end of the cross beam 2, a pressing metal 8 is installed with a predetermined length in the circumferential direction of the propelling tube 10, and a pressing member 9 having three rectangular cross sections is attached to the tip portion of the propelling tube 10. It is in contact with the outer peripheral surface.

  In the present embodiment, the pressing members 9 to be mounted on the pressing bracket 8 are disclosed at three locations, but the pressing members 9 are increased or decreased depending on the diameter of the propelling tube 10. As the material of the pressing member 9, it is possible to use a wood having a rectangular cross section. However, when the propulsion extension is long, a relatively strong hard plastic material or steel material may be used. In order to reduce wear on the outer surface of the propelling tube 10, it is more effective to employ a rotatable roller or the like.

  As the material of the support column 3 and the cross beam 2 constituting the fixed frame 1, a strong steel material is used so as to withstand the deflection force received from the propulsion pipe 10. Specifically, the H-shaped steel material for mountain retaining that allows easy joining between members is excellent. The adjustment bracket 4 requires an adjustment height that allows the pressing member 9 attached to the pressing bracket 8 to be separated from or abut on the outer peripheral surface of the propelling pipe 10, and a screw jack or the like having the adjustment height is selected. The

  FIG. 2 is a longitudinal sectional view for explaining the tubular body supporting device of the present invention. Two fixed frames 1 are installed in the propulsion direction behind the start pit wall 11 provided in front of the start shaft. The lower ends of the left and right support pillars 3 constituting the fixed frame 1 are fixed on the sleeper 7 of the propulsion table 5. In order to ensure the self-supporting property of the two fixed frames 1, a method of inserting a holding material between the front and rear fixed frames 1 and between the front fixed frame 1 and the starting well wall 11 is employed.

  The propulsion pipe 10 is pushed forward by a former push jack (not shown) mounted on the rear side, and passes through the two fixed frames 1, so that the propulsion pipe 10 is always at the planned line position by the pusher 8 installed at the lower end of the cross beam 2. Is supported to maintain. When the soil condition in front of the start shaft is weak, the excavator and the propulsion pipe 10 pushed out from the start shaft try to sink at the front end of the ruler 6 on both sides and the rear portion tends to rise. The fixed frame 1 installed on the rear side prevents the propulsion pipe or the like from lifting up behind and holds the planned line position.

  In the present embodiment, the installation of the fixed frame 1 is disclosed at two locations. However, when the soil condition in front of the start shaft is good and only the lift of the excavator or the propulsion pipe 10 is targeted, the installation of the fixed frame 1 is performed. It is also possible to have only one place.

  As described above, the tubular body support device of the present invention can be applied to propulsion work under high water pressure with a lot of groundwater or soft soil conditions.

It is a cross-sectional view explaining the tubular body support device of the present invention. It is a longitudinal cross-sectional view explaining the tube body support apparatus of this invention.

DESCRIPTION OF SYMBOLS 1 Fixed frame 2 Cross beam 3 Supporting pillar 4 Adjustment metal fitting 5 Propulsion stand 6 Ruler 7 Sleeper 8 Pushing bracket 9 Pushing material 10 Propulsion pipe 11 Starting well wall

Claims (1)

During propulsion construction, it is a pipe support device for preventing the excavator and propulsion pipe from rising and northing down in the start shaft,
In order to maintain the center and level of the excavator and the propulsion pipe in the starting shaft, the bottom of the ruler provided in the propulsion direction on both sides below the excavator and the propulsion pipe is perpendicular to the propulsion direction. A fixed stand in which a plurality of sleepers are fixed, a fixed frame in which upper horizontal beams and left and right support columns are assembled in a cross-beam shape so as to surround the excavator and the propelling pipe in the propulsion direction behind the starting pit wall, and the fixing Below the transverse beam of the frame, it is composed of a pressing bracket equipped to contact the outer surface of the excavator and the propulsion pipe, and an adjustment bracket provided in the middle of the left and right support pillars of the fixed frame. Or it is fixed to the bottom plate concrete of a shaft, and is installed in at least one place or more.

Images