JP2009167599A - Excavator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excavator, including a cut-off mechanism capable of forming a shielding wall for underground water, hardly causing breakage due to propulsion during excavation. <P>SOLUTION: An annular consolidation agent extraction groove 12 is provided in the outer periphery of a casing 11a of the excavator 1, feed pipes 14a for feeding out two liquids: sodium silicate and a consolidation liquid and an Y-shaped mixing pipe 13 connected thereto are connected to the consolidation agent extraction groove 12, a number of narrow impeller blades 16 are disposed in the circumferential direction along the consolidation agent extraction groove 12 to partly overlap the groove, and the tips 16b are fixed by bolts 16b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  An excavator used in a propulsion method for constructing a tunnel, which prevents groundwater from moving through the gap between the outer periphery of the fuselage casing of the excavator and the drilling hole during drilling. The present invention relates to an excavator equipped with a water mechanism. In particular, the present invention relates to an excavator with a water stop function capable of preventing entry of groundwater into the reaching structure when the wall of the reaching structure is removed after reaching the reaching structure.

  Conventionally, in order to construct a tunnel of a propulsion pipe in the ground using the propulsion method, excavation of the tip while pushing the rearmost end of the propulsion pipe of the excavator composed of an excavator and a plurality of propulsion pipes while propelling the entire apparatus The ground is excavated with a machine to form a tunnel. When the excavator arrived at the reaching structure after excavation, a water stop was installed inside the reaching structure, and then the wall of the reaching structure was partially removed to push the excavator to the water stop. In this case, groundwater from the ground drilled during the removal work of the wall, sediment flow, inflow water from the river, or muddy water used for drilling, the outer periphery of the propulsion pipe and excavator and the inner surface of the hole It has flowed into the reaching structure through the gap between the two walls, making it difficult to remove some walls and push out the excavator. There was also a collapse of natural ground due to the outflow of water and muddy water.

  In the past, in order to solve this problem, chemicals were injected before this extrusion work, and the excavator was pushed out to the water stop pit after confirming the water stop effect. However, with this water stop method, it is still necessary to install the reaching wellhead in the reaching structure, so that the space in the reaching structure becomes narrow and the extrusion work is difficult, and the equipment cost and work cost of the reaching wellhead are incurred. It was.

Also, as an alternative method, a rubber plate expansion type water-stop function in which an annular rubber plate is provided around the casing outer periphery of the excavator and high-pressure air is sent from the inside of the rubber plate to be expanded to form a water stop wall. An attached excavator is known from Japanese Patent Application Laid-Open No. 2001-288882, but in this rubber plate expansion type, the rubber plate is damaged by friction with the inner surface (ground) of the drilling hole during propulsion and used when reaching The situation was impossible.
JP 2001-288882 A

  The problem to be solved by the present invention is to solve the conventional problems, do not require the installation of a water stop in the reaching structure, and provide the water stop mechanism in the excavator itself, An object of the present invention is to provide an excavator for use in a propulsion method in which the propulsion method hardly damages and becomes unusable due to contact with a drilling wall.

The configuration of the present invention that solves this problem is as follows.
1) An excavator in a propulsion method in which an excavator is placed at the tip, a propulsion pipe is added to the rear, excavated by the excavator, and the rear end of the propulsion pipe is pressed to propel the whole.
An annular caulking agent extraction groove is provided on the outer periphery of the casing of the excavator, and a pipe with an on-off valve that sends out the caking agent that rapidly solidifies after pouring is connected from the inside of the casing to the caulking agent extraction groove. A thin plate-like elastic valve body that can close the groove opening is disposed on the groove opening of the annular pouring groove, the tip of the valve body is fixed to the casing, and the opposite end is a free end. The pressure from the pouring groove of the caking agent and the caking material solidified by the caulking caking agent are expanded and the valve body and the solid warped between the outer peripheral surface of the casing and the hole wall of the drilling hole. Propulsion method excavator, characterized by forming a barrier wall made of ligated material 2) The adjacent casing on the propulsion direction side of the pouring groove is thinly shaved so that the propulsion direction side becomes deeper The excavator of the propulsion method described in 1) above, wherein a recessed portion is provided, and the tip of the valve body is disposed in the recessed portion. 3) The excavator of the propulsion method according to 1) or 2), wherein the valve body is formed by connecting a large number of narrow and narrow blades in an annular manner so as to partially overlap each other. 4) The tip of the blade plate The excavator of the propulsion method described in the above 3), in which the width of the portion is shortened and the blade is easily deformed so that the blades are warped. 5) The above described 1) to 4), wherein the valve body is made of thin spring steel. 6) The excavator of the propulsion method described in 1) to 5) above, wherein the caking agent is a two-component mixed caking agent.

According to the present invention, there is a valve body fixed at the tip of the propulsion side above the groove opening of the annular pouring groove into which the caking agent has been poured. The water pressure force of groundwater acts in the direction of pressing the valve body against the outer peripheral surface of the casing, and the valve body is elastically deformed so as to be in close contact with the outer peripheral surface of the casing, and the valve body itself is damaged by external force and water pressure. There are few things. Therefore, even if it is excavated and propelled for a long time, the valve body can be largely damaged. When the caking agent is poured out from the pipe at a place where water stoppage is required, such as immediately before the reaching structure, the valve body is lifted by the caulking pressure and the caking material that is rapidly consolidated by being discharged from the pouring groove. In addition, the free end of the valve body is elastically deformed to the hole wall surface of the drilling hole, and can form a blocking wall composed of the valve body and a solidified material to stop water.
In particular, when the valve body is formed of a large number of blades, only the blades that are in contact with the hole-drilling wall are elastically deformed, so that deformation is easy and damage can be reliably reduced. Even when the outer diameter of the casing of the excavator is different, an annular valve body having a required outer diameter can be formed by changing the number of the same blades, and the casing diameter is also good.
Furthermore, if the propulsion-side casing to which the valve body is attached is recessed in an inclined shape, and the tip of the valve body is fixed in the recessed portion, the amount of protrusion from the outer peripheral surface of the casing, such as the fixing bracket at the tip, becomes small. It is possible to reduce damage.

The material of the valve body / blade of the present invention may be made of an elastic metal that is not easily rusted (for example, spring steel), or a plastic that is water and pressure resistant. The valve body may be one in the circumferential direction, or may be divided into a plurality of rings in the circumferential direction and connected in a ring shape, but most preferably a plurality of small blades connected in a ring shape so as to partially overlap. .
The groove width of the pouring groove of the present invention is about 5 mm.
The rapid-solidifying caking agent of the present invention may be either a two-component or a one-component.

Embodiment 1 of the present invention will be described below with reference to the drawings.
In the first embodiment, the valve body is formed with a large number of spring steel blades, provided with a recessed portion inclined on the propulsion direction side of the pouring groove, and the tip of the blade plate is fixed to the recessed portion with a bolt, This is an example in which a two-component mixed type is used as the caking agent.

FIG. 1 is an explanatory diagram showing the state of the excavator immediately before reaching the manhole.
FIG. 2 is a partially cutaway side view of the excavator according to the first embodiment.
FIG. 3 is a cross-sectional view showing a cross section of the extraction groove of the first embodiment.
FIG. 4 is an explanatory diagram illustrating a mounting state of the blade body according to the first embodiment.
FIG. 5 is an explanatory view showing the state of the blades during excavation.
FIG. 6 is an explanatory view showing a state where the caking agent is being poured out.

  In the figure, 1 is an excavator used for the propulsion method, 2 is a propulsion pipe, 3 is a manhole which is a reaching structure, 4 is a drilling hole, and 5 is a water blocking wall formed by a valve body or the like. In the figure, 10 is a rotary excavator at the tip of the excavator 1, 10a is an excavator blade of the rotary excavator, 11a is a front casing of the excavator 1, 11b is a rear casing of the excavator 1, and 11c is a casing. , 12 is an annular solidifying agent pouring groove having a width of 5 mm and a depth of 5 mm provided in the middle of the casing 11 a, and 13 is a Y-shape that feeds the two-component mixed caking agent into the coagulating agent pouring groove 14a and 14b are feed pipes for independently sending two liquids of a caking agent connected to the two pipes of the mix pipe, 15a and 15b are open / close valves attached to the feed pipe, and 16 is a length. Is a 1 mm thick spring steel blade with a width of 200 mm, a free end of 60 mm, and a tip 16 a of 30 mm. The adjacent blade 16 has an overlap of 10 mm to form a valve element B. ing. 16b is a bolt for fixing the tip 16a of the blade plate 16 to the casing 11a, 17 is an inclined recess of the casing 11a, and 18 is a consolidated product of a caking agent.

In the first embodiment, before excavation, the blade plate 16 is in a state shown in FIG.
Next, during excavation, there is a lubricant, muddy water, and groundwater between the casing 11a and the drilling hole 4, and the blades 16 are brought into close contact with the surface of the casing 11a by a pressure of 0.1 MPa or less. Deform. The vane plate 16 is made of spring steel, and is deformed so as to be in close contact with the casing 11a, and the vane plate 16 is hardly damaged because the vane plate is as thin as 1 mm.

  Next, when reaching the manhole 3 which is a reaching structure, before the excavator 1 enters the manhole 3, one sodium silicate of two liquids of the caking agent is fed to the feeding pipe 14a. Further, another liquid consolidated liquid (trademark: Aron SR-US) is fed to the feeding pipe 14b at a pressure of 0.2 to 0.3 MPa. By opening the valves 15 a and 15 b, both are fed to the pouring groove 12 while being mixed by the Y-shaped mixing tube 13. Since the pouring groove 12 is annular, the mixed caking agent moves to the outer periphery of the casing 11a along the pouring groove 12, and the caking agent mixed from the groove opening of the pouring groove 12 is drilled. To pour out. Sodium silicate and the Aron SR-US consolidated liquid chemically react to form a consolidated product 18 within 10 to 10 seconds. The vane plate 16 is lifted by the pouring pressure of the caking agent and the presence of the caking product 18. The tip width of the slat 16 is almost halved and is easy to bend. The slat 16 rises due to these pressures and the solidified matter 18, and the slat 16 rises more and more when underground water pressure is applied thereto. Thus, the water blocking wall 5 is formed as a blocking wall between the hole 4 and the casing 11a. This state is shown in FIG.

  6, the wall of the manhole 3 is manually removed from the inside of the manhole 3. Thereafter, the excavator 1 enters the manhole 3. Groundwater is prevented from flowing into the manhole 3 by the water blocking wall 5 formed by the blades 16.

  INDUSTRIAL APPLICABILITY The present invention can be used for excavators for constructing large, medium and small diameter tunnels using a propulsion method.

It is explanatory drawing which shows the state of the excavator just before reaching a manhole. It is a partially cutaway side view of the excavator of Example 1. It is sectional drawing which shows the cross section of the extraction groove | channel of Example 1. FIG. It is explanatory drawing which shows the attachment state of the blade body of Example 1. FIG. It is explanatory drawing which shows the state of the blade blade during excavation. It is explanatory drawing which shows the state which has poured out the caking agent.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavator 2 Propulsion pipe 3 Manhole 4 Drilling hole 5 Water blocking wall 10 Rotating excavator 10a Excavation blade 11a, 11b Casing 11c Connection part 12 Solidification agent extraction groove 13 Mixing pipe 14a, 14b Feeding pipe 15a, 15b Open / close valve 16 Blades 16a Tip 16b Bolts 17 Recesses 18 Consolidation

Claims (6)

An excavator in a propulsion method that places an excavator at the tip, adds a propulsion pipe to the rear of the excavator, excavates with the excavator, and pushes the rearmost end of the propulsion pipe to propel the whole,
An annular caulking agent extraction groove is provided on the outer periphery of the casing of the excavator, and a pipe with an on-off valve that sends out the caking agent that rapidly solidifies after pouring is connected from the inside of the casing to the caulking agent extraction groove. A thin plate-like elastic valve body that can close the groove opening is disposed on the groove opening of the annular pouring groove, the tip of the valve body is fixed to the casing, and the opposite end is a free end. The pressure from the pouring groove of the caking agent and the caking material solidified by the caulking caking agent are expanded and the valve body and the solid warped between the outer peripheral surface of the casing and the hole wall of the drilling hole. A propulsion method excavator, characterized in that it forms a barrier wall made of lignite and can stop water.   2. The excavator for a propulsion method according to claim 1, wherein an adjacent recess on the propulsion direction side of the pouring groove is thinly cut to provide an inclined recess that is deeper in the propulsion direction, and the tip of the valve body is disposed in the recess. .   3. The propulsion method excavator according to claim 1 or 2, wherein the valve body is formed by connecting a large number of elastic blades having a small width so as to partially overlap each other.   The excavator of the propulsion method according to claim 3, wherein the width of the tip portion of the slat is shortened so that it is easily elastically deformed so that the slat is warped.   The excavator of the propulsion method according to claim 1, wherein the valve body is made of thin spring steel.   The excavator of the propulsion method according to claim 1, wherein the caking agent is a caking agent mixed with two liquids.

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