JP5441180B2 - Lubricant injection device - Google Patents

Description

  The present invention relates to a lubricant injection device that reduces friction during propulsion by injecting a lubricant between an outer peripheral surface of a propulsion pipe and a natural ground.

  In the propulsion method, with regard to propulsive force management, which is particularly important, it is an important key to continue stable propulsion while reducing the peripheral frictional force generated on the outer periphery of the propulsion pipe. In this construction technology, various thrust reduction devices have been empirically developed over several decades as an important subject of research since the propulsion method was developed.

  For example, a lubricating material injection method is generally used in which excavation is performed while uniformly injecting the lubricating material around the outer periphery of the propulsion pipe. As the method, (1) a perforated pipe injection method in which many injection holes are provided in the propulsion pipe, (2) Install a mechanical widening device on the outer periphery of the propulsion pipe to build a clearance, and then inject the lubricant into the location, and (3) Install a tail brush behind the excavator. In addition, there is a pipe circumference mixing method in which the injected lubricant is dug while stirring and mixing with a tail brush, and various other propulsive force reduction devices.

However, at present, such a propulsive force reduction method is not clearly effective under the following construction conditions and ground conditions.
a) In the case of the propulsion method under high water pressure, the discharged lubricant is diluted with groundwater and dispersed in the ground, and the effect of the lubricant is low.
b) In the case of excavation of a highly collapsible natural ground with a small uniformity coefficient and a uniform particle size, the natural ground often collapses at the time of excavation. As a result, earth and sand fall on the outer peripheral surface of the propulsion pipe. Tightening occurs.
c) In the case of excavation of a natural mountain with a high water permeability coefficient and a lot of voids, the friction material is dispersed upward from the top of the pipe and does not remain on the outer periphery of the propulsion pipe. Easy to rise.
d) When rock joints, cracks, and stratiform fracture are preceded in excavation of rock, etc., sharp wedge-shaped fractured rocks are present on the outer periphery when passing through the propulsion pipe after excavation, and its tightening resistance Increases and the propulsion becomes impossible.
e) In addition, in a natural ground with a very small amount of fine particles (silt, clay, colloid) (approximately 15% or less), a large amount of coarse particles tends to increase the frictional resistance of the outer periphery of the propulsion pipe.

  Under the above conditions, the propulsion method is very difficult. As countermeasures for them in the current situation, there are many cases of improving the ground by injecting chemicals to reduce water permeability in advance, but as a result, there are problems of securing the occupied area when injecting from the road, groundwater contamination and It causes damage to underground objects and causes various problems to the surrounding environment. Construction technology that relies on such auxiliary construction methods has resulted in numerous problems before the propulsion method. For this purpose, first, a construction method for reliably leaving a stable consolidated lubricant on the outer peripheral portion of the propelling tube is effective, but the conventional construction technique cannot prevent scattering of the lubricant.

  By the way, as a lubricant, there are a one-part type and a two-part type that gels by a chemical reaction between the A and B materials. At present, the frictional resistance is low and the compressive strength is lower than that of the one-part type. Excellent two-component consolidated lubricants are frequently used. A lubricant injection device that injects this two-component lubricant is disclosed in Patent Document 1. This technology is a separate system for separately supplying A material and B material to the vicinity of the discharge port, a mixer for mixing the separately supplied A material and B material immediately before discharge, and a mixed lubricant to the discharge port. It is characterized by the fact that it consists of a single line of piping to be supplied.

  However, in the above technique, the mixed lubricant is supplied to the discharge port by a single line of piping, and therefore, when the reaction is fast, the tube may be solidified and blocked before discharge. In addition, if the reaction is slowed (or discharged quickly) so that it does not consolidate in the piping, it will cause the incomplete gelation of the lubricant to be discharged, leading to the excavation of natural rocks that are prone to collapse or that have many voids. In this case, there was a problem that the propellant tube was tightened by the fallen earth and sand because the lubricant was scattered without being gelled in time.

JP 2002-327597 A

  The problem to be solved by the present invention is to solve these problems of the prior art, and to prevent the fall of the natural ground by gelling the two-component lubricant before the collapse of the natural ground. It is to make sure that it can be prevented.

The configuration of the present invention that solves this problem is as follows.
1) A connecting collar for inserting the insertion port of the propelling pipe at the rear end of the outer shell of the excavator is provided with a slightly smaller diameter than the outer shell, and the two-component lubricant A is located at the level difference between the connecting collar and the outer shell. A discharge port is provided to discharge the B material and B material separately. An injection pipe with a valve for supplying the A material and B material is installed in the outer shell, and the A material and B material discharged from the discharge port are connected. The above-mentioned connection in the lubricant injection device that allows gelation by contacting on the collar and leaving the gelled lubricant between the outer peripheral surface of the propulsion tube and the ground to reduce friction during propulsion. A protective collar that blocks the collapse of the natural ground is installed over the outer circumference so that it has the same diameter as the outer shell of the excavator, and a reaction chamber that opens rearward between the protective collar and the connecting collar. Lubricant injection device 2), which is formed and plugged into the injection tube so that it can move forward and backward. The unblocking rod for releasing the provided, in synovial material injection apparatus of the 1), wherein.

  According to the configuration described in 1) of the present invention, when the A material and the B material discharged from the discharge port come into contact and react, even if the natural ground is about to collapse, it is protected by the protective collar, and the sliding material is affected by the collapse. Gelation proceeds in the reaction chamber under the protective collar. After that, the gelled lubricant fills the reaction chamber and is pushed out of the protective collar by propulsion and the discharge of the next A and B materials. As a lubricant layer between the outer periphery of the propelling tube and the natural ground Leave it behind. Even if the natural ground is about to collapse on the remaining lubricant, since the lubricant is already gelled and expresses the predetermined compressive strength, the natural ground is supported by the lubricant and the earth and sand does not tighten the propulsion pipe. . Moreover, the lubricant does not escape into the gap even in the ground with many gaps. Thus, since gelation is completed and left before the collapse of the natural ground, the natural ground is prevented from falling off, and scattering of the lubricant can be reliably prevented. It should be noted that a plurality of discharge ports can be provided so that the lubricant can be injected evenly in all directions.

  According to the configuration described in the above 2) of the present invention, when the gelling lubricant flows back into the injection tube and solidifies in the injection tube, the clogging portion is penetrated and stabilized by advancing and retracting the closure release rod. The infusion can continue.

It is explanatory drawing which notched a part of excavation machine and the propulsion pipe of the Example. It is explanatory drawing of the excavation machine seen from the back of the Example. It is explanatory drawing of the lubricating material injection apparatus of an Example.

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

  1 is an explanatory view in which a part of the excavator and the propelling pipe of the embodiment is cut out, FIG. 2 is an explanatory view of the excavator viewed from the rear of the embodiment, and FIG. 3 is an explanatory view of the lubricant injection device of the embodiment It is. In the figure, 1 is an excavator, 11 is an outer shell, 12 is a connection collar, 2 is a propulsion pipe, 21 is a water stop packing, 3 is a lubricant injection device, 31 and 32 are discharge ports, 33 is an injection pipe, 34 is An occlusion release rod, 35 is an injection valve, 36 is an injection hose, 37 is a protective collar, 38 is a reaction chamber, A is a lubricant, and G is a natural ground.

  As shown in FIGS. 1 to 3, the lubricant injection device 3 of this embodiment is provided with a connection collar 12 at a slightly smaller diameter than the outer shell 11 at the rear end of the excavator 1, and the connection collar 12 and the outer shell 11 are connected to each other. Four discharge openings 31 for the A material and discharge openings 32 for the B material are adjacent to each other at the stepped positions in the vertical and horizontal directions. An injection tube 33 is attached to the discharge ports 31 and 32 in the outer shell 11, and a closing release rod 34 that can be advanced and retracted by rotation is attached to the proximal end portion of the injection tube 33. The injection pipe 33 is branched at an intermediate position and an injection valve 35 is attached, and an injection hose 36 is connected to the injection valve 35.

  A steel protective collar 37 is attached to the upper position of the connecting collar 12 over the outer circumference so as to have the same diameter as the outer shell 11 of the excavator 1, and the A material is interposed between the protective collar 37 and the connecting collar 12. A reaction chamber 38 for the B material is formed. The injection valve 35 may be electrically operated, and the discharge ports 31 and 32 may be automatically opened and closed by a time system using a timer so that the injection range is necessarily omnidirectional.

  In this embodiment, the injection hose 36 is connected to a lubricant supply device (not shown) installed on the ground to supply the A material and the B material separately at a constant pressure, and the injection valve 35 is opened to B material is continuously sent out at a predetermined rate according to the propulsion. The A material and the B material are discharged from the discharge ports 31 and 32 through the injection tube 33, and contact with each other in the reaction chamber 38 to start gelation. At that time, even if the natural ground G tries to collapse, it is protected by the protective collar 37, and the sliding material A is gelled under the protective collar 37 without being affected by the collapse. When the gelling lubricant A flows backward into the injection tube 33 and solidifies, the clogging portion is penetrated by rotating the closure release rod 34 to advance and retract.

  The gelled lubricant A fills the reaction chamber 38 and is pushed out of the protective collar 37 by propulsion and discharge of the next A and B materials, and slips between the outer periphery of the propelling tube 2 and the ground G. Leave as a material layer. Even if the natural ground G is about to collapse on the remaining lubricating material A, since the lubricating material A has already gelled and exhibits a predetermined compressive strength, the natural ground G is supported by the lubricating material A and the earth and sand are propelled by the propelling pipe. 2 is not tightened. Further, the lubricant A does not escape into the gap even in the natural ground G having many gaps. Thus, since gelation is completed and left before the collapse of the natural ground G, scattering is reliably prevented and the propulsion pipe 2 can be smoothly promoted.

  The technology of the present invention is useful for excavating a natural mountain that is easy to collapse or a natural mountain with many voids.

DESCRIPTION OF SYMBOLS 1 Excavator 11 Outer shell 12 Connection collar 2 Propulsion pipe 21 Water stop packing 3 Lubricant injection device 31, 32 Discharge port 33 Injection pipe 34 Closure release rod 35 Injection valve 36 Injection hose 37 Protective collar 38 Reaction chamber A Lubricant G Ground Mountain

Claims (2)

  A connecting collar for inserting the insertion port of the propulsion pipe at the rear end of the outer shell of the excavator is provided with a slightly smaller diameter than the outer shell, and the A material of the two-component lubricant is provided at the step position between the connecting collar and the outer shell. A discharge port for discharging B material separately is provided, and an injection pipe with a valve for supplying A material and B material is attached to the discharge port in the outer shell, and the A material and B material discharged from the discharge port are connected on the collar. In the lubricant injection device, the gelled lubricant is left between the outer peripheral surface of the propulsion pipe and the ground, so that friction during propulsion can be reduced. A protective collar that blocks the collapse of the natural ground at the upper position was provided over the outer circumference so that it had the same diameter as the outer shell of the excavator, and a reaction chamber with a rear opening was formed between the protective collar and the connecting collar. A lubricant injection device characterized by the above.   The lubricant injection device according to claim 1, further comprising a blocking release rod that is inserted into the injection tube so as to be able to move forward and backward to release clogging.

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