JP2014091972A - Rectangular boring machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely prevent the collapse of soil grains even in a subgrade apt to loosen and stabilize the subgrade, in a sealed type rectangular boring machine which constructs a conduit line of rectangular cross section.SOLUTION: A hood 7 having a length covering above a rotary cutter 5 is attached to a forward end surface of an outer shell 1, a filler supply pipe 8b with a check valve 8a for supplying a consolidation type filler A to be filled between the hood 7 and a subgrade G is arranged inside the hood 7, and a discharge port 8 of the consolidation type filler A is opened in a top face of the hood 7. When a rectangular boring machine is advanced, the rotary cutter 5 excavates the subgrade G while the hood 7 penetrates the subgrade G, and the subgrade G above the rotary cutter 5 immediately after excavation is immediately supported by the hood 7 before th subgrade G can be even collapsed. Accordingly, collapse can be prevented even in the subgrade G apt to loosen. Furthermore, since the consolidation type filler A is filled in a place in front of a barrier 3, the subgrade G can be early stabilized as compared with the case of a conventional rectangular boring machine.

Description

  The present invention relates to a sealed rectangular excavator for constructing a pipe having a rectangular cross section, and more particularly, to a technique for preventing ground loosening during excavation and stabilizing the ground at the top of the excavation at an early stage.

  When performing continuous excavation with a closed-type rectangular excavator, it is most important to maintain the pressure of the face and to check the amount of soil that has been removed (the amount of excavated ground soil + the amount of material added to the face). It is. To that end, measures against delays in human error due to construction, mechanical / electrical troubles and changes in soil particle composition of excavated ground, and excavation and soft ground in excavated areas once excavated and disturbed the ground In order to respond to this encounter, measures and safety devices are always required to ensure the stability of natural ground.

  By the way, in the conventional rectangular excavator, the rotary cutter protrudes forward from the front end of the outer shell, and the discharge port of the solid filler that fills the gap between the outer shell and the ground to stabilize the ground is the outer shell of the excavator A structure formed at the rear of the is generally used. Therefore, in the loose ground, after the rotary cutter excavates, before the outer shell pushes to the excavation position, loose ground of the ground above the rotary cutter is likely to occur depending on the soil condition, and the solid filler is injected. Sometimes it was not in time.

JP 2009-2069 A

  The problem to be solved by the present invention is to solve these conventional problems and to reliably prevent the fall of soil particles even in a loose ground, and to stabilize the ground at an early stage.

The configuration of the present invention that solves this problem is as follows.
1) A rectangular cross-section propelling box is connected to the rear of the excavator that has a rectangular cross-section outer shell and excavates the ground into a rectangular cross-section, and a plurality of rotary cutters in front of the outer shell are rotated and revolved. In the rectangular excavation machine that constructs a rectangular cross-section pipe in the ground by taking the excavated earth and sand into the machine and discharging it to the rear while excavating the ground into a rectangular cross-section and repeatedly adding and pushing the propelling box A hood with a length that covers the top of the rotary cutter is attached to the upper front edge of the outer shell, a drilling blade is attached to the tip of the hood, and a solidified type that fills the gap between the hood and the ground above it. A rectangular digging machine characterized in that a filling material supply pipe for supplying a filling material is provided, and a discharge port for a consolidated filling material supplied by the filling material supply pipe is opened in the hood. A plurality of narrow excavating blades are arranged in an uneven shape at the tip. The rectangular digging machine 3) described in 1) above, wherein the penetration resistance during digging can be reduced by the unevenness, and the solidified filler is a two-component curing type, and the two-component The rectangular excavator 4 according to the above 1) or 2), which can be discharged separately and allowed to react and harden outside the hood to consolidate the upper ground after excavation so as to prevent ground subsidence and loosening. ) Any one of the above 1) to 3), wherein a muddy water discharge port for plastic fluidizing excavated sediment is opened at the front end or lower surface of the hood, and a muddy water supply pipe for supplying muddy water to the discharge port is provided inside the hood. It is in the described rectangular machine.

  According to the present invention, when the rectangular excavator is driven, the rotary cutter excavates the ground and the hood penetrates the ground, and the ground immediately above the rotary cutter immediately after excavation is immediately supported by the hood without collapsing. Therefore, it is possible to reliably prevent the collapse even in the loose ground. In addition, since the discharge port for the consolidated filler is formed in the hood, it is injected, consolidated, and filled at a position in front of the partition wall, and the ground can be stabilized at an early stage as compared with the prior art.

It is a front view of the rectangular machine of an Example. It is a side view of the rectangular excavation machine of an Example. It is a top view of the rectangular excavation machine of an Example. It is sectional drawing of the rectangular excavation machine of an Example. It is an expanded sectional view of the food | hood of an Example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be specifically described based on examples and drawings.

  As shown in FIGS. 1 to 4, the outer shell 1 has a rectangular cross section divided forward and backward, and the insides of the front and rear outer shells 1 are connected by four direction correcting jacks 2, and the direction correcting jacks 2 are individually connected. By extending and contracting, the outer shell 1 is bent halfway so that the front outer shell 1 can be inclined at a predetermined angle.

  A partition wall 3 with a soil discharge port 3a is attached to the front portion of the front outer shell 1, and a soil removal device 4 for discharging the excavated soil back is attached to the rear portion of the soil discharge port 3a. In the figure, 4a is a discharge valve, 4b is a screw conveyor, 4c is a discharge gate, and 4d is a motor. Three rotary cutters 5 that excavate the ground G into a rectangular cross-section while rotating and revolving are provided at positions around the earth discharge port 3a, and a drive unit 6 that rotates and revolves the rotary cutter 5 is attached to the partition wall 3. In the figure, 6a is a motor.

  The hood 7 has a length that substantially covers the upper side of the rotary cutter 5, and is attached to the position of the upper side of the front end of the outer shell 1 on the front side so as to be continuous with the outer surface of the outer shell 1. A plurality of narrow excavation blades 7a are attached to the tip of the hood 7 at predetermined intervals so as to be arranged in an uneven shape. The outer shell 1 is formed in a vertically long shape slightly above the revolution center position of the rotary cutter 5 so that the rotary cutter 5 does not interfere with the hood 7.

  As shown in FIG. 5, the hood 7 has a filler supply pipe 8b with a check valve 8a for supplying a consolidated filler A, and a check valve 9a for supplying a high-concentration muddy water stabilizing liquid. A muddy water supply pipe 9 b is provided, the discharge port 8 for the consolidated filler A is opened on the upper surface of the hood 7, and the discharge port 9 for the high-concentration muddy water stabilizing liquid is opened on the front end and the lower surface of the hood 7. The solidified filler A is a two-component curing type, and the two components are supplied and discharged through separate filler supply pipes 8 b and reacted outside the hood 7.

  In this embodiment, when a rectangular propulsion box 10 having a rectangular cross section is connected to the rear end of the outer shell 1 and the rear end of the propulsion box 10 is pushed forward to propel the rectangular excavator, three bodies are rotated. The cutter 5 excavates the ground G into a rectangular cross section and the hood 7 penetrates into the ground G. The ground G immediately above the rotary cutter 5 immediately after excavation is immediately supported by the hood 7 without collapsing. Thereby, even the ground G which is easy to loosen is reliably prevented from collapsing. Further, when the hood 7 penetrates into the ground G, the contact portion with the ground G is reduced due to the uneven shape of the tip, the penetration resistance is reduced, and the propulsion force is increased and the load on the hood 7 is reduced.

  In parallel with the excavation, the consolidated filler A and the high-concentration mud stabilization liquid are sent out by a pump (not shown). The two liquids of the solidified filler A discharged from the discharge port 8 on the upper surface of the hood 7 react and harden while being filled in the gap between the hood 7 and the ground G above it. Thus, since the solidified filler A is discharged at a position in front of the partition wall 3, the gap G is filled earlier and the ground G is stabilized as compared with the rectangular excavator of the prior art.

  The high-concentration mud stabilization liquid is discharged forward and obliquely downward from the discharge port 9 provided at the front end and the lower surface of the hood 7, and is agitated with the excavated sediment by the rotary cutter 5 so that the excavated sediment is plastically fluidized. It is taken in from 3a and discharged backward by the screw conveyor 4b. As described above, the underground box is dug while repeating the addition and the main pushing of the propelling box 10, and a pipe having a rectangular cross section is constructed.

  The technology of the present invention is useful for excavating soft ground, ground that does not easily fall, and ground with many voids.

DESCRIPTION OF SYMBOLS 1 Outer shell 2 Direction correction jack 3 Bulkhead 3a Earth discharge port 4 Earth removal device 4a Earth removal valve 4b Screw conveyor 4c Earth removal gate 4d Motor 5 Rotary cutter 6 Drive part 6a Motor 7 Hood 7a Excavation blade 8 Discharge port (consolidation A)・ B tube)
8a Check valve 8b Filler supply pipe 9 Discharge port 9a Check valve 9b Mud supply pipe (face injection material)
10 Promotion Box A Solidified Filler G Ground

Claims (4)

  A rectangular cross-section propulsion box is connected to the rear of the excavator that has a rectangular cross-section outer shell and excavates the ground into a rectangular cross-section, and a plurality of rotary cutters in front of the outer shell are rotated and revolved. In the rectangular excavator that constructs a rectangular cross-section pipe in the ground by taking excavated earth and sand into the machine while discharging the ground while excavating the ground into a rectangular cross-section and discharging it backwards and repeatedly adding and pushing the propelling box A hood with a length that covers the top of the rotary cutter is attached to the upper edge of the hood, a drilling blade is attached to the tip of the hood, and a solidified filler that fills the gap between the hood and the ground above it inside the hood A rectangular engraving machine characterized in that a filler supply pipe for supplying water is piped, and a discharge port for a consolidated filler supplied through the filler supply pipe is opened in a hood.   The rectangular excavator according to claim 1, wherein a plurality of narrow excavating blades are attached to the tip of the hood at predetermined intervals so as to be arranged in an uneven shape, and the penetration resistance during excavation can be reduced by the unevenness.   The solidified filler is a two-component curing type. The two components are discharged separately and reacted outside the hood to cure, and the upper ground after excavation is consolidated to prevent subsidence and loosening. The rectangular excavation machine according to claim 1 or 2, which is made possible.   The muddy water discharge port that plastically fluidizes the excavated earth and sand is opened at the front end or the lower surface of the hood, and a muddy water supply pipe that supplies muddy water to the discharge port is piped inside the hood. Rectangular machine.

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