JP2006045836A - Slime sucking and hardening material injecting method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems of producing waste that a specially injected hardening material is discharged as slime, and thinning a built-up hardening material layer, since excessive suction may be caused, when ground internal pressure of the object ground exceeds a predetermined value, though conventionally an arrival distance of a hardening material jet is extended and the ground internal pressure is adjusted by sucking the generating slime when injecting a ground hardening material. <P>SOLUTION: An adjustably opening-closing shutter 55 is attached to a slime suction hole 5. A ground internal pressure measuring sensor 54 is arranged in a rod tip part. Slime suction corresponding to an internal pressure variation in the object ground by injection pressure of the hardening material, is performed by adjusting opening and closing of the shutter, and the excessive suction is prevented, and proper slime suction force is held. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a slime suction hardener injection method used for ground hardener injection for the purpose of creating a hardener injection structure for the purpose of stabilization of soft ground, foundation of structures, support of ground in tunnel excavation, etc. It relates to the device.

  Conventionally, the hardened material injection structure has been created by injecting the ground hardened material from the injection rod inserted into the target ground by high pressure injection, but the internal pressure of the target ground is increased by the hardened material injection pressure, and its adjustment is a problem. It has become.

  For adjusting the internal pressure of the target ground, the method of lifting excess slime by air lift through the injection rod insertion hole has been carried out for a long time, but sufficient effect has not been obtained, especially when inserting the injection rod in the horizontal direction I could not do it.

  In view of this, a method has been developed in which a slime suction hole is opened in the injection rod and excess slime is discharged through a discharge path constituted by multiple dividing paths in the injection rod (see, for example, Patent Document 1).

By setting the slime suction hole, systematic processing of surplus slime became possible, and results were achieved, but since the conveying force was weak only by opening the slime suction hole, sufficient internal pressure adjustment could not be performed, A jet injection hole for injecting a jet stream in the slime discharge direction is provided at the bottom of the discharge path in the injection rod, and a swirl flow injection nozzle for injecting a swirl flow that swirls in the discharge path is disposed outside the injection rod. A method (for example, see Patent Document 2) that promotes slime suction and discharge is also developed.
Japanese Patent Publication No. 8-11889 Japanese Patent No. 2602386

  As for the discharge of slime sucked from the slime suction hole, as described above, the jet injection hole for injecting the jet flow in the slime discharge direction is provided at the bottom of the discharge path, and the swirl flow injection for injecting the swirl flow swirling in the discharge path Slime suction and discharge force is promoted by arranging nozzles, etc., but if the ground pressure of the target ground exceeds the predetermined value, excessive suction occurs, and the hardened material injected at a corner is discharged as slime and wasted There is a problem that the hardened material layer to be formed is thinned.

  In addition, when the inserted injection tube rod encounters a groundwater layer, a large amount of water flows into the slime discharge path together with the slime and overflows into the work space, making it difficult to continue the work. If the material injection continues for a long time or the injection depth becomes deeper, the rod must be added or removed on the way, so each time the rod's internal pressure decreases and the hard material injection nozzle or slime inhalation becomes a bare hole There is a problem in that earth and sand enter from the hole and clogging is caused in the pressure feeding route for the hardened material and the slime discharge route.

  In particular, in the case of an injection rod that is inserted in the horizontal direction, it is difficult to grasp the internal pressure fluctuation of the target ground due to the injection pressure of the hardener, so it is difficult to maintain an appropriate slime suction input in relation to the internal pressure. There is also a problem.

  In order to address the above-described problems, the slime suction hole is provided with a slime suction hole provided with a shutter that opens and closes according to the measured value of the ground pressure measurement sensor at a position spaced above the polymerization injection nozzle by a predetermined distance. A jet injection hole for injecting a jet stream in the slime discharge direction is provided at the bottom of the discharge path for discharging slime sucked from the air, and a back air nozzle for injecting air at a predetermined interval is arranged on the top of the jet injection hole. An injection rod was used.

  In other words, an adjustable shutter is attached to the slime suction hole, and a ground pressure measurement sensor is provided at the tip of the rod, so that the slime suction corresponding to fluctuations in the internal pressure of the target ground due to the injection pressure of the hardener can be adjusted. To prevent excessive suction and maintain proper slime suction.

  In addition, the polymerization injection nozzle is provided with a shutter that opens and closes by the curing material injection pressure, and the interruption or pause of the curing material injection is linked with the opening and closing of the nozzle shutter, so that the curing material injection continues for a long time or the injection depth increases. If the rod is added or removed on the way, the hardener injection pressure is also interrupted, so the nozzle shutter is automatically closed, and earth and sand are transferred from the hardener injection nozzle to the pressure supply path for the hardener and the slime discharge path. The intrusion was prevented.

  Furthermore, the discharge auxiliary jet hole provided on the inner wall of the slime discharge path is changed to the back air nozzle to reduce the specific gravity of the slime, and the propulsion in the discharge direction as discharge auxiliary is forced from the forced one to the adjusted ground pressure As a propulsive force without any pressure, the ground pressure of the target ground and the slime suction force are balanced.

  Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an injection rod which is supported by an operating mechanism (different in form such as moving forward and backward in the horizontal direction according to the purpose) 2 and is given operations such as lowering, raising, rotating, and 360-degree reciprocating rotation.

  A superposition jet nozzle 3 composed of a core nozzle 31 and a surrounding nozzle 32 is provided on the tip side wall of the injection rod 1, and the ground pressure measurement sensor 54 measures the site at a predetermined interval above the superposition jet nozzle. A slime suction hole 5 provided with a shutter 55 that opens and closes depending on the value is set.

  The superposition jet nozzle 3 opens the shutter 33 by the supply pressure of the hardened material supplied by the supply path 11 via the swivel 4 to inject the hardened material from the core nozzle 31 and the air supplied by the supply path 12 Each is injected into the ground through a surrounding nozzle 32 surrounding the periphery.

  Reference numeral 5 denotes a slime suction hole, which is opened above the polymerization injection nozzle 3 at a predetermined interval. Excess slime generated by the injection operation from the injection nozzle 3 is sucked by using its internal pressure energy and lifted to the slime processing mechanism. To send. 51 is a curing material supply path for supplying the curing material to the core nozzle 31, 52 is an air supply path for supplying compressed air to the surrounding nozzle 32, and 53 is a jet supply path.

  A ground pressure measurement sensor 54 is set at a portion spaced from the slime suction hole 5 at a predetermined interval, and the ground pressure of the target ground at the tip of the injection rod is always measured and displayed on the operation unit. Yes. The inside of the injection rod is a parallel porous path, and has a porous path that opens to each opening of the injection nozzle 3 and the slime suction hole 5.

  At the bottom of the discharge path 6 where the slime suction hole 5 opens, a jet injection hole 7 for injecting a jet stream in the direction of slime discharge is set at the center, and a back air injection nozzle 8 for injecting air is set on the inner wall of the upper discharge path. Has been.

  Further, relay nozzles 9 by back air or jet injection are arranged on the inner wall of the discharge path 6 at predetermined intervals as required.

  By the apparatus system as described above, first, the injection rod 1 is rotated by the operation mechanism 2 and the target ground X is drilled by the metal crown 10 while the drilling water is ejected from the drilling water supply path 13. Inserted into the propulsion.

  At a predetermined depth, the injection rod 1 while opening the shutter 33 by the supply pressure of the hardening material supplied by the supply path 11 and injecting the ground hardening material from the core nozzle 31 of the polymerization injection nozzle 3 and air from the surrounding nozzle 32. When rotating backward, the high-pressure and high-speed hardener jet cuts and agitates the target ground, and a hardener injection layer is formed along the trajectory.

  On the other hand, the target ground ground pressure, which is changed by the muddy water slime or the hardened material spray pressure, which has been sprayed from the spray nozzle 3 and has lost its crushing force due to the spray, is measured by the ground pressure measurement sensor 54, and this is above a predetermined value. Then, oil is supplied to the hydraulic line 14 and the shutter 55 is opened corresponding to the measured value.

  The opening of the shutter 55 is adjusted by a hydraulic unit 56 operated according to the measured value displayed by the ground pressure measurement sensor 54 and displayed on the slime suction hole opening display digital meter. When the shutter 55 is opened, surplus slime that increases the ground pressure is sucked from the slime suction hole 5 by the internal pressure energy accumulated in the slime itself by the subsequent injection and the suction negative pressure of the discharge path 6.

  The sucked slime is accelerated by the relay nozzle as required by riding on the transport flow by the jet injection hole 7 opening at the bottom of the discharge path 6 and the back air injection nozzle 8 set on the inner wall of the discharge path at the top, Although it is sent to the slime processing mechanism through the discharge path 6, when the ground pressure of the target ground is lowered by the suction, the opening of the shutter 55 is adjusted to reduce the suction amount and to balance the hardener injection.

  Further, when the rod is added or removed on the way, the shutter 33 and the shutter 55 can be closed in advance, so that when the rod is removed, the internal pressure is temporarily reduced, and the slime suction hole and the hardener injection It was possible to prevent earth and sand from entering the pressure-feeding path of the hardened material and the slime discharge path from the nozzle.

  As described above, the hardened material jetted at a high pressure from the polymerization jet nozzle 3 is adjusted in density by slime suction, and the ground hardened material injection layer A is formed by stirring and mixing the surrounding soil with increased porosity. It is made to continue to a predetermined structure by making it parallel or the like.

  Since the present invention is configured as described above, the slime discharge in the case of horizontal injection that could not be achieved by slime inhalation, which depended entirely on the ground pressure of the target ground and could not cope with the situation of groundwater etc. In addition to being able to perform powerfully, it has made it possible to completely complement the discharge power of the relay nozzle that could not be achieved with a suction pump.

  Furthermore, since the suction force of the slime suction hole is actively created and adjusted, slime containing high-mass mud sludge is suctioned and removed in the immediate vicinity of the injection nozzle, and the injection pressure is effectively increased to reach the reach of the hardener jet There is an effect that can be extended.

Whole explanatory drawing which shows the construction situation of the horizontal direction by the Example of this invention Enlarged longitudinal sectional view schematically showing the structure of the injection rod tip monitor section Explanatory drawing showing the porous structure of the injection rod tip monitor part as a cross section and schematically showing the shutter opening / closing mechanism of the slime suction hole

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection rod 11 Curing material supply path of injection rod 12 Air supply path of injection rod 13 Drilling water supply path of injection rod 14 Hydraulic line of injection rod 15 Check valve of drilling water supply path 2 Operation mechanism 3 Polymerization injection nozzle 31 Nuclear nozzle
32 Surrounding nozzle
33 Opening and shutting shutter of superposition jet nozzle 4 Swivel
5 Slime suction hole
51 Pressure sensor cable 52 Back air supply path 53 Jet supply path 54 Ground pressure measurement sensor 55 Slime suction hole opening / closing shutter 56 Slime suction hole shutter opening / closing hydraulic unit 6 Slime discharge path 7 Jet injection hole 8 Back air injection nozzle 9 Rod relay bolt 10 Rod crown A Hardened material injection layer X Target ground

Claims (4)

A slime suction hole with a shutter that opens and closes according to the measured value of the ground pressure measurement sensor is opened at a position above the polymerization injection nozzle at a predetermined interval, and is placed at the bottom of the discharge path for discharging the slime sucked from the slime suction hole. A jet injection hole for jetting jet flow in the slime discharge direction is provided, and a back air nozzle for injecting air at a predetermined interval is provided above the injection rod, and an injection rod arranged on the inner wall of the discharge path is inserted into the target ground, and a predetermined depth is obtained. Injecting the curing material while injecting the air from the surrounding nozzle of the polymerization injection nozzle and rotating the rod while rotating the rod while rotating the rod, and the ground pressure of the target ground measured by the ground pressure measurement sensor together with the curing material injection And adjusting the ground pressure of the target ground by adjusting the opening of the slime suction hole shutter. Arm suction curing material grouting The slime suction curable material injection method according to claim 1, wherein a shutter for opening and closing the curable material injection pressure is provided in the polymerization injection nozzle, and the suspending or stopping of the curable material injection is interlocked with the opening and closing of the nozzle shutter. A slime suction hole with a shutter that opens and closes according to the measured value of the ground pressure measurement sensor is opened at a position above the polymerization injection nozzle at a predetermined interval, and is placed at the bottom of the discharge path for discharging the slime sucked from the slime suction hole. The injection rod is provided with a jet injection hole for injecting a jet flow in the slime discharge direction, and a back air nozzle for injecting air in the slime discharge direction at a predetermined interval above the injection rod, and the injection rod Slime suction hardener injection device comprising a drive mechanism that provides operations such as propulsion and rotation 4. A slime suction hardener injection device according to claim 3, wherein a shutter that opens and closes by a hardener injection pressure is provided on a polymerization injection nozzle set on the injection tube rod.

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