JP2003074292A - Boring machine recovery lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boring machine recovery lock capable of recovering while positively preventing the gush of underground water and sediment when taking a boring machine at the tip into an arrival shaft in an advancing construction method. SOLUTION: This boring machine recovery lock allows the boring machine at the tip to arrive at the arrival shaft in the advancing construction method wherein the boring machine equipped with a cutting means is installed at the head of an advancing pipe and the advancing pipe is advanced and buried in the ground while cutting the natural ground. The boring machine recovery lock is composed of a cylindrical body having an inner diameter larger than the outer diameter of the boring machine and longer than the whole length of the boring machine, a ring-like rubber plate provided at the tip of the cylindrical body and having a hole smaller than the outer diameter of the boring machine, a fixing means for fixing the tip of the cylindrical body to an earth retaining wall, and a closing cover fixedly provided at the rear end of the cylindrical body to close the cylindrical body.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recovery lock when a tip excavator is taken into a reaching shaft in a propulsion method. 2. Description of the Related Art The propulsion method is a method in which a propulsion pipe is buried underground while excavating the ground from a starting shaft by a drilling machine installed at the head of the propulsion pipe. Collected by taking it into a shaft. As a method of recovery, when the excavator reaches the front of the reaching shaft, a hole larger than the outer diameter of the excavator is opened in the retaining wall of the reaching shaft, and a ring with a hole smaller than the outer diameter of the excavator A reaching wellhead wall consisting of a cylindrical body equipped with a rubber-shaped rubber plate at its rear end is fixed to the hole of the retaining wall. When the installation of the arrival well wall is completed, the excavator is advanced and guided into the cylinder of the arrival well wall, and is taken into the arrival shaft while expanding the hole of the rubber plate. Since the excavator slides in while expanding the diameter of the rubber plate hole, it blocks earth and sand and groundwater from outside the mine. [0003] In the above-mentioned reaching wellhead wall, a rubber plate adheres to the outer shell of the excavator to block earth and sand and groundwater in the case of good quality soil with little groundwater, but the soil is boulder or soil. In the case of the gravel layer, there is a problem that cobblestones and gravel bite between the outer shell of the excavator and the rubber plate as the excavator advances, and groundwater and earth and sand erupt and flow into the pit. Therefore, a lot of sediment and groundwater will be drawn into the reaching shaft, which will have an adverse effect on the land subsidence and structures around the shaft. This is particularly noticeable in soils with high groundwater pressure. For this reason, the present invention provides an excavator recovery lock which can safely recover an excavator without infiltration of groundwater or earth and sand into the reaching shaft, even if the groundwater pressure is large and the soil quality is weak or cobblestone or gravel layer. To provide. [0005] That is, according to the present invention, an excavator equipped with a cutting means is installed at the head of a propulsion pipe, and the propulsion pipe is buried underground while cutting ground. In the propulsion method, in the recovery lock to make the excavator at the tip reach the arrival shaft, it has an inner diameter larger than the outer diameter of the excavator,
A cylindrical body longer than the entire length of the excavator, and a hole having a diameter larger than the outer diameter of the cylindrical body at the front end flange of the cylindrical body and smaller than the outer diameter of the excavator at the center is locked. An excavator comprising: a ring-shaped rubber plate; fixing means for fixing the front end of the cylindrical body to a retaining wall; and a closing lid fixed to the rear end of the cylindrical body so as to close the cylindrical body. It is a lock for collection. The cylindrical body is formed in a cylindrical shape having an inner diameter having a size larger than the outer diameter of the excavator so that the excavator can be stored therein, and has a length greater than the entire length of the excavator in the propulsion direction. Produced with When the outer diameter of the excavator is large, assembling and disassembling operations can be easily performed by dividing the excavator vertically and vertically. The material of the cylinder is
A relatively strong steel material is used, and reinforced with a rib material, a shape steel, or the like so as to sufficiently withstand the water pressure or the like filled in the cylinder. [0007] The closing lid is fixedly provided so as to close the rear end of the cylindrical body. The fixing method may be welding, but it is also possible to use a fixing method using bolts and nuts at predetermined intervals in the circumferential direction so as to be removable. The material of the opening / closing lid is also reinforced with a rib material or a steel shape using a steel material so as not to be deformed or damaged by water pressure or the like. A ring-shaped rubber plate having a diameter larger than the outer diameter of the cylindrical body is provided at the tip of the cylindrical body. At the center of the rubber plate, a hole having a diameter slightly smaller than the outer diameter of the excavator is provided. The rubber plate is attached to a flange provided on the outer periphery of the distal end of the cylindrical body, and is fixed to the retaining wall together with the flange of the cylindrical body by fixing means. As a fixing means, when the retaining wall is a concrete structure, anchor bolts are embedded at predetermined intervals in the circumferential direction in the concrete, and fixed with nuts at the flange of the cylinder so as to sandwich the rubber plate. In the case of a steel material structure such as a steel sheet pile, a fixed method is used in which a front flange sandwiching a rubber plate is welded to a retaining wall, and the flange portion is covered with concrete and reinforced. When the excavator comes near the reaching shaft retaining wall, the propulsion construction is stopped once, and a through hole is formed in the retaining wall at the arrival position of the excavator with a diameter slightly larger than the outer diameter of the excavating machine. A lock for excavator recovery will be installed in this area. When the setting of the excavator collection lock is completed, water or muddy water is injected into the excavator collection lock through an injection hole provided in the excavator collection lock to fill it. Then, the excavator is advanced again and inserted into the excavator recovery lock through the hole of the rubber plate provided at the tip of the excavator recovery lock. At this time, with the insertion of the excavator, from the drain hole provided in the excavator recovery lock,
Water or muddy water is drained to prevent the pressure inside the excavator recovery lock from increasing above a certain level. When the entire excavator has been stored in the excavator recovery lock, drain the water or muddy water from the excavator recovery lock, check that there is no intrusion of groundwater or earth and sand, and dismantle the excavator recovery lock. Detach the excavator from the leading propulsion pipe and remove it outside the shaft. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view illustrating a lock for recovering an excavator according to the present invention. The reaching shaft 1 is constructed by a retaining wall 2 having a concrete structure. At the location of the retaining wall 2 where the excavator 9 reaches, a through hole 14 is formed in the retaining wall 2 with a diameter slightly larger than the outer diameter of the excavator 9. The through-hole 14 has an inner diameter larger than the diameter of the through-hole 14 and is longer than the entire length of the excavator 9, and smaller than the outer diameter of the excavator 9 provided at the tip of the cylindrical body 4. A ring-shaped rubber plate having a hole, a closing lid 5 fixed to the rear end of the cylindrical body 4 so as to close the cylindrical body 4, and an excavator collection lock 3.
The flange 7 provided at the tip of the excavator collection lock 3 is fixed to the earth retaining wall 2 by fixing means 15. An injection hole 11 for injecting water or muddy water is provided at the top of the cylinder 4. A drain hole 12 for draining water or muddy water is provided below the closing lid 5. When the excavator 9 comes before the reaching shaft 1,
The propulsion work is temporarily stopped, and a through hole 14 is opened in the retaining wall 2 at a position where the excavator 9 reaches. Then, the excavator collection lock 3 in which the cylindrical body 4, the closing lid 5 and the rubber plate 6 are assembled is installed and fixed in the through hole 14 portion. When the fixation of the excavator recovery lock 3 is completed, water or muddy water is injected into the excavator recovery lock 3 from the injection hole 11 and filled. When the filling is completed, the propulsion construction is resumed, and the excavator 9 moves forward and enters the through hole 14 of the retaining wall 2. The tip of the excavator 9
After passing through the through hole 14, the excavator 9 comes into contact with the hole of the rubber plate 6 provided at the tip of the excavator collection lock 3, and the outer shell of the excavator 9 penetrates the rubber plate so as to be pushed and widened. At this time,
Drainage is performed from the drainage hole 12 such that a pressure equal to or higher than a predetermined pressure is not applied to the excavator recovery lock 3. Excavator 9
After completion of the propulsion of the extruded portion of the propulsion pipe 10 into the arrival shaft 1 after the completion of the excavation, the water and the like in the excavator recovery lock 3 are drained, and it is confirmed that there is no intrusion of groundwater or earth and sand. The excavator recovery lock 3 is dismantled. Thereafter, the excavator 9 is pulled out from the propulsion pipe 10 and is removed outside the attainable shaft 1 by the suspension means. When the diameter of the excavator 9 is small, the excavator recovery lock 3 may have an integrated structure. However, since the excavator 9 needs to have a long space in the propulsion direction to be pulled out of the excavator 9 at the time of removal. A structure divided into upper, lower, front and rear is effective. The cylindrical body 4 and the closing lid 5 are provided with an excavator recovery lock 3.
It is reinforced with ribs and steel to withstand the water pressure filled inside. The rear surface of the rubber plate 6 is tightly squeezed by a ring member 8 such as a wire in the circumferential direction so as to have substantially the same diameter as the outer diameter of the excavator 9, so that the outer shell of the excavator 9 and the rubber plate 6 are in close contact Can be improved. FIG. 2 is a view taken in the direction of arrows AA in FIG. The cylindrical body 4 of the excavator recovery lock 3 is manufactured to have a size larger than the outer shell 16 of the excavator 9 so that the excavator 9 can be stored. A flange 7 is provided on the circumference at the tip of the cylindrical body 4, and is fixed to the retaining wall 2 by fixing means 15 so as to sandwich the rubber plate 6 on the front surface. As the fixing means 15, a method is used in which an anchor bolt embedded in the retaining wall 2 is passed through holes provided in the rubber plate 6 and the flange 7 and is fixed by a nut. Below the excavator recovery lock 3, a rail 13 is provided in a propulsion direction so that the excavator 9 entering the excavator recovery lock 3 maintains a predetermined direction and height. 4 is provided on the inner wall. As the rail member 13, a steel material having strength so as not to be deformed or damaged by sliding of the excavator 9 or the like is used. As described above, the excavator recovery lock according to the present invention allows the excavator and the propulsion pipe to be pushed out of the excavator recovery lock at a time, and the excavator recovery lock. Since the inside of the shaft is filled with water and muddy water, it does not move forward with the excavator body not housed in the reaching shaft as in the past, the disturbance of the surrounding ground due to sliding of the excavator is eliminated, and And groundwater runoff has been reduced, and groundwater and sediment no longer erupt into the arrival shaft. In addition, before dismantling of the lock for recovering the excavator, the presence or absence of inundation of groundwater or the like in the lock can be confirmed, so that measures such as ground improvement at the front of the reaching shaft can be quickly taken before an accident occurs. [0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view illustrating a lock for recovering an excavator according to the present invention. FIG. 2 is a view taken in the direction of arrows AA in FIG. [Description of Signs] 1 Arrival shaft 2 Retaining wall 3 Excavator recovery lock 4 Cylindrical body 5 Closure lid 6 Rubber plate 7 Flange 8 Ring material 9 Excavator 10 Propulsion pipe 11 Injection hole 12 Drainage hole 13 Rail material 14 Through hole 15 fixing means 16 outer shell

Claims (1)

Claims: 1. An excavator equipped with a cutting means at the head of a propulsion pipe is installed, and the propulsion construction method of propelling and burying the propulsion pipe underground while cutting the ground. In a recovery lock for allowing the excavator to reach the arrival shaft, a cylinder having an inner diameter larger than the outer diameter of the excavator and being longer than the entire length of the excavator; A ring-shaped rubber plate having a diameter larger than the outer diameter and provided at the center with a hole smaller than the outer diameter of the excavator, and fixing means for fixing the tip of the cylindrical body to the retaining wall; And a closing lid fixedly mounted on the rear end of the cylindrical body so as to close the cylindrical body.