JP4512072B2 - Water stoppage propulsion structure for wellheads in propulsion work - Google Patents

Description

  The present invention relates to a water stop propulsion structure for a wellhead in propulsion work. More specifically, the present invention relates to a water stop propulsion structure for a pit that propels an excavator and a buried pipe while preventing inflow of groundwater and the like from a pit opened to a start shaft.

  As shown in FIGS. 3 (a) and 3 (b), a general water stop propulsion structure for a general wellhead in a propulsion work in which a sewer pipe or the like is laid in the ground has an excavator main body 110 attached to a side wall 102 in a start shaft 101. A wellhead 103 larger than the outer diameter is opened, and a cylindrical wellhead shell 104 is attached to the inside of the start shaft 101 of the wellhead 103. A waterstop rubber 106 is attached along the inner periphery of the wellhead outer shell 104 by a pressing plate 107 along the wellhead flange 105 of the cylindrical wellhead outer shell 104. In this way, the excavator and the buried pipe are propelled into the wellhead 103 to which the waterstop rubber 106 is attached, and the waterstop rubber 106 causes earth and sand and groundwater from the wellhead to flow into the well due to collapse of a natural ground. (For example, refer to Patent Document 1).

JP 2002-276288 A

  However, when initial excavation of gravel, cobblestone ground, etc. in a high aquifer, a heavy load is applied to the excavation cutter, and the main body of the excavator remaining in the vertical shaft swings up and down and from side to side. This excavator body shake is mainly received by the press plate at the wellhead, but the clearance between the retainer plate and the excavator body depends on the type of the excavator, but at least 2 to 3 cm is required.

  Therefore, if a heavy load is applied to the excavation cutter, the main body of the excavator will come into contact with a presser plate, and a clearance of 4 to 6 cm will be generated on the opposite side of the contact point. The excavation machine deviates significantly from the planned line as groundwater and earth and sand erupt.

  For this reason, as shown in FIGS. 4 (a) and 4 (b), a comb-shaped adjusting plate 108 having a bolt hole as a long hole 109 is superposed on a holding plate 107, and the comb-shaped adjusting plate is passed through the excavation cutter wellhead. There is a mechanism that adjusts the clearance by bringing the plate 108 close to the excavator body 110, but in a gravel layer with a lot of cobblestone, etc., a comb-shaped adjustment plate that causes the excavator body to continuously shake and is bolted In many cases, the fastening of 108 is loosened, and the comb-shaped adjusting plate 108 gradually moves in the outer circumferential direction to return the clearance to the original.

  The present invention was devised in view of the above points, and is used to stop water at a wellhead in propulsion work that can support the excavator body and the buried pipe in a slidable state after passing through the wellhead of the excavation cutter. The purpose is to provide a propulsion structure.

  In order to achieve the above-mentioned object, the water stop propulsion structure in the wellhead in the propulsion work according to the present invention is directed toward the reaching wellhead through the waterstop rubber provided in the waterstop well attached to the wellhead established in the starting shaft. In the propulsion work in which the excavator and the buried pipe sequentially connected thereto are propelled and laid in the ground, the excavation is performed at the rear end of the water stop pit with the excavator inserted into the water stop pit. A frame body is attached so as to surround the outer periphery of the body of the machine, and a support portion is formed by filling a hollow portion between the excavator and the frame body with a hardening material.

  Here, by forming a support unit integrated with the frame body and the hardener at the rear of the water stop pit part, the restraint of the excavator by the pit and the water tightness between the pit and the outer peripheral surface of the excavator are improved. The water stop propulsion structure.

  In addition, the shock caused by the excavator's run-out is mitigated by winding a buffer band fixed to the hardener between the hardener filled in the frame and the outer peripheral surface of the excavator. As a result, damage to the instrumentation equipment and wellhead of the excavator can be prevented.

  Moreover, the friction between the excavator and the buffer belt can be reduced by interposing a lubricant between the buffer belt and the outer peripheral surface of the excavator.

  In addition, by providing a mud pressure mechanism consisting of a earth pressure gauge, a mud inlet and a mud outlet on the outer wall surface of the water stop pit, high-concentration mud water can be passed through the gap between the water stop pit and the excavator at the required pressure. The inside can be filled with pressure to prevent sediment collapse.

  In the water stop propulsion structure of the wellhead in the propulsion work of the present invention, the large runout generated during the initial excavation of the excavator is supported in close contact with the outer peripheral surface of the excavator by the support unit integrated with the frame and the hardener. Thus, it is possible to prevent damage to the wellhead, earth and sand collapse, and deviation from the planned alignment of the excavator.

  In addition, the shock due to the excavator swinging can be mitigated by the buffer zone, and damage to the instrumentation equipment and wellhead of the excavator can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings to provide an understanding of the present invention.
FIG. 1 is an explanatory view showing an outline of propulsion work in a water stop propulsion structure for a wellhead to which the present invention is applied, and FIGS. 2 (a) and (b) show an example of a water stop propulsion structure for a wellhead to which the present invention is applied. It is explanatory drawing shown.

  In the start shaft 1 in the propulsion work shown here, the bearing wall 2 is arranged on the wall surface in the start shaft 1, and the start frame 3 is placed on the bottom surface in a state of being connected to the bearing wall 2. A main push jack 4 is installed on the starting stand 3 with its base end supported by the bearing wall 2.

  Next, a water stop pit 5 is opened on the opposite wall surface of the main push jack 4, the base end of the excavator main body 6 is pushed out by the main push jack 4, and the excavation cutter 7 at the tip of the excavator main body 6 is It passes through the still water pit 5 and excavates in the natural ground A.

  In this way, the base end of the excavator main body 6 is pushed out by the main push jack 4 and the excavator main body 6 is advanced to the reaching shaft B while the buried pipe is added to the rear end thereof to lay the buried pipe. .

  Therefore, as shown in FIGS. 2 (a) and 2 (b), a water stop pit having an inner diameter into which a drilling cutter 7 provided at the tip of the excavator main body 6 can be inserted into a wall surface (mountain retaining material) 8 in the start shaft 1. The part 10 is attached by welding.

  And the opening hole 9 of the state which the natural ground was exposed is formed by cut | disconnecting and removing the wall surface 8 from the said water stop pit part 10. FIG. A flange portion 11 is provided around the base end opening edge of the water stop pit portion 10.

  In addition, a mud outlet 31 provided with a mud valve 30 and a mud inlet 33 provided with a mud feed valve 32 are attached to the water stop pit 10, and a soil pressure gauge 34 is further provided.

  A ring-shaped water-stopping rubber 12 is fixed to the flange portion 11 by a fastening member 14 such as a bolt or a nut while being sandwiched by a pressing plate 13. Accordingly, the water stop rubber 12 has an inner diameter smaller than the outer diameter of the excavator main body 6 so that the outer peripheral surface of the excavator main body 6 is brought into close contact with the inner peripheral edge of the water stop rubber 12 being bent.

  In this way, the excavator main body 6 is installed on the start frame 3, and the main push jack 4 pushes the excavator cutter 7 at the tip of the excavator main body 6 from the inside of the water blocking pit 10 until it reaches the natural ground A. .

  Here, a gel-like lubricant 15 such as grease oil is applied to the outer surface of the excavator main body 6. And the buffer band 16 in which an outer surface is formed in uneven | corrugated shape is wound around the said excavation machine main body 6, and the front end side is adjusted so that the water stop rubber 12 position of the said water stop well part 10 may become.

  A steel frame body 17 is provided along the upper surface of the buffer body 16. One end of the frame body 17 is integrally fixed by welding or the like along the outer peripheral edge of the flange portion 11 of the water blocking pit portion 10, and the other end is in a right angle shape so as to contact the rear end of the buffer band 16. It can be bent.

  Therefore, a cavity 18 is formed along the buffer band 16, and an inlet 19 that communicates with the cavity 18 is provided on the upper surface of the frame 17. A high ready-mixed concrete 20 is placed in the cavity 18 to integrate the frame body 17 and the buffer band 16.

  That is, when the ready-mixed concrete 20 is hardened, the unevenness of the upper surface of the buffer strip 16 makes the bond with the ready-mixed concrete 20 strong, and the steel frame 17 and the ready-mixed concrete 20 and the buffer strip are strengthened. The ring-shaped support part 21 in which 16 is integrated is formed.

  In this embodiment, ready-mixed concrete is used as the hardener. However, it is not necessarily required to be ready-mixed concrete, and may be a raw material such as a hardened resin material. If the material is small and has elasticity, it is not necessary to implement a cushioning band such as a lubricating material such as grease oil and elastic rubber described in detail in this embodiment.

  The support portion 21 advances while the peripheral wall surface of the excavator body 6 is supported by the buffer band 16 of the support portion 21, and a buried pipe (not shown) sequentially connected to the rear end of the excavator body 6. .)) Can be held without shaking due to vibration or the like.

In addition, although a present Example explains in full detail the case where a water stop pit is a cylindrical shape, an excavation machine is not necessarily a cylindrical shape, and there exists a rectangular or irregular circular shape.
Therefore, the shape of the wellhead of the water stop pit is also matched to the shape of the excavator, but by attaching a frame so as to surround the outer periphery of the excavator, the hardening material injected into the frame is the It becomes a water stop propulsion structure that is in close contact with the outer periphery of the body of the excavator and has improved water tightness.

  In the structure of the water stop propulsion wellhead according to the present invention, as shown in FIG. 2 (a), high-concentration muddy water is brought to a required pressure from the mud spout 33 into the gap between the water stop well portion 10 and the excavator main body 6. Inject.

  Next, excavation work is performed by operating the excavation cutter 7 and the main push jack 4. In this case, the mud feed valve 32 and the mud discharge valve 30 are operated in order to maintain the required pressure while monitoring the earth pressure gauge 34 provided at the water stop pit 10.

Therefore, the initial process until the excavator main body 6 fits in the natural ground A is the process in which landslide collapse and the excavator's planned linear deviation are the most among all the excavation processes up to the reach shaft.
Thus, the large runout that occurs during the initial excavation of the excavator main body 6 is caused by the support portion in which the steel frame body 17, the ready-mixed concrete 20, and the buffer band 16 are connected to the flange portion 11 of the water blocking pit portion 10. It becomes possible to protect by supporting the peripheral wall surface of the excavator main body 6 by 21.

  Further, the buffer band 16 can alleviate the impact caused by the swinging of the excavator main body 6 and can prevent the instrumentation equipment and the wellhead of the excavator main body 6 from being damaged. Furthermore, the lubricant such as grease oil reduces the friction between the excavator body 6 and the buffer band 16.

  In addition, since the swing and impact of the excavator main body 6 disturbs the natural ground in the vicinity of the mountain retaining material, high-density mud water is pressurized and filled with the required pressure to prevent the collapse of the earth and sand. Therefore, when the earth pressure gauge 34 falls below the required pressure, the mud feed valve 32 is opened to inject high-concentration mud water, and when the earth pressure gauge 34 rises above the required pressure, the mud feed valve 32 is closed. At the same time, the mud valve 30 is opened to discharge the high-concentration mud water, and the pressure in the gap between the water stop pit 10 and the excavator main body 6 is adjusted.

  When the mud discharge valve 30 is opened, the muddy water is discharged by the pressure on the natural ground A side and the natural differential pressure in the shaft.

It is explanatory drawing which shows the outline | summary of the propulsion work in the water stop propulsion structure of the wellhead to which this invention is applied. It is explanatory drawing which shows an example of the water stop propulsion structure of the wellhead to which this invention is applied. It is explanatory drawing which shows an example of the water stop propulsion structure of the conventional wellhead. It is explanatory drawing which shows the other example of the conventional water stop propulsion structure of a wellhead.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Starting shaft 2 Supporting wall 3 Starting stand 4 Moment push jack 5 Water stop pier 6 Excavator main body 7 Excavation cutter 8 Wall surface 9 Opening hole 10 Water stop pit part 11 Flange part 12 Water stop rubber 13 Holding plate 14 Fastening member 15 Sliding Material 16 Buffer zone 17 Frame 18 Cavity 19 Filler 20 Ready-mixed concrete 21 Support 30 Mud valve 31 Mud port 32 Mud valve 33 Mud port 34 Earth pressure gauge

Claims (5)

In the propulsion work that lays underground in the ground by propelling the excavation machine and the buried pipe sequentially connected to the reaching pit through the water stop rubber provided at the pier of the water stop installed at the start pit,
A frame that surrounds the outer periphery of the body of the excavator is attached to the rear end of the water stop pit with the excavator inserted in the stop pit, and the excavator and the frame Water stop propulsion structure for wellheads in propulsion work, characterized in that a support part is formed by filling the cavity between them with a hardener. The propulsion work according to claim 1, wherein a buffer band fixed to the hardener is wound around the outer peripheral surface of the excavator between the hardener filled in the frame and the outer peripheral surface of the excavator. Water well propulsion structure at the wellhead. The water stop propulsion structure for a wellhead in propulsion work according to claim 2, wherein a lubricant is interposed between the buffer zone and the outer peripheral surface of the excavator. The water stop propulsion structure for a wellhead in propulsion work according to claim 1, 2, or 3, wherein the hardened material is ready-mixed concrete. The water stop of the wellhead in the propulsion work according to claim 1, 2, 3, or 4, wherein a mud pressure mechanism comprising an earth pressure gauge, a mudlet and a mud discharge port is provided on the outer wall surface of the water stop well. Propulsion structure.

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