JP4504995B2 - Ground hardening material injection method and its equipment - Google Patents

Description

  The present invention is a ground hardening material injection method and apparatus for creating a ground hardening material layer in the ground by high-pressure injection of ground hardening material into the target ground for the purpose of strengthening support of the building foundation ground or stabilizing the ground and stopping water. It is about.

  Conventionally, ground hardener injection for ground lining support, reinforcement support, or hardener layer construction for the purpose of water stoppage has been achieved by extending the reach of the hardener jet even a little to increase the diameter of the hardener layer. Various methods have been devised with ideal creation, and one of them is a method of extending the reach distance by encapsulating and protecting the hardener jet with air using a polymerization injection nozzle consisting of a core nozzle and an annular nozzle surrounding it. (See, for example, Patent Document 1).

  Prior to the hardening material jet, prior improvement by clear water injection is performed, the effective range of the hardening material jet is extended (for example, see Patent Document 2), or surplus slime is sucked by a suction mechanism (for example, see Patent Document 3). Measures to improve slime discharge have been taken.

Furthermore, by making the inner wall of the side injection nozzle into a spiral structure, means for extending the effective range by applying a helical rotation to the high-pressure-injected hardener jet (see, for example, Patent Document 4) has been taken.
Japanese Patent Publication No.7-110031 Japanese Patent No. 2865653 Japanese Patent Publication No. 6-29506 JP-A 63-289110

  However, since the injection nozzle that injects the ground hardening material at a high pressure is set on the side wall of the injection rod, the ground hardening material that has been pumped is refracted at a substantially right angle at the nozzle portion, and the turbulent flow generated at the bending portion. Therefore, there is a problem that the pumping energy is consumed and attenuated.

  In addition, if the injection pressure is increased to extend the reach of the hardener jet flow, there is a risk of it, and there is a risk of causing an unnatural load on the ground and causing phenomena such as ground uplift. However, such a large amount is necessary, and it becomes a heavy burden in terms of cost.

  Furthermore, the diameter of the hardened material pumping flow path in the conventional injection rod does not change greatly although there may be some difference in volume diameter due to structural reasons, and due to the occurrence of turbulence due to bending etc. Concerning the decay of pumping energy consumption, in addition to applying spiral rotation to the hardening material jet to add energy during injection as in the invention described in Patent Document 4, it is not possible to change the pumping force consciously. I have not been told.

  In order to solve the above-described problems, the present invention forms a swirl flow guiding structure at a portion from a predetermined portion of the hardening material pressure-feeding passage communicating with the core nozzle of the injection rod to the core nozzle, thereby pumping the material. Is configured to generate a swirling flow with less energy loss.

  Further, the diameter of the material feeding channel is expanded from the tip monitor part, a swirling flow guiding structure is formed in a predetermined range from the expanding part to the inlet of the nuclear nozzle, and the fluid guiding channel formed by the swirling flow guiding structure is spiraled. A high-pressure jet that is extended while maintaining the swivel angle and communicated with each core nozzle is injected obliquely to the injection rod tube wall (in a direction tangential to the concentric circular arc with the cross-section circle of the injection rod). I made it.

  That is, by expanding the diameter of the material pressure feed passage connected to the core nozzle of the injection rod at the tip monitor unit, a powerful feed pressure is released and the inside of the pressure feed passage is pumped as a spiral swirl flow by the swirl flow guiding structure. The hardened material flow is smoothly concentrated at the inlet of the nuclear nozzle without being refracted, and is injected into the core nozzle that opens obliquely with respect to the injection rod tube wall while keeping the spiral turning angle. Is intended to be enhanced.

  Further, the spiral guide groove or protrusion or plate blade constituting the swirl flow guiding structure is formed into a multi-thread spiral structure in which a plurality of guide grooves or protrusions or plate blades rotate in parallel, and the multi-strand induction rotating in parallel A plurality of superposition spray nozzles were set on the injection rod tube wall by opening the core nozzles corresponding to the respective paths.

  The multiple injection nozzles set on the injection rod tube wall are configured to be provided at the upper step part or the same level part of the injection rod pipe wall, and the injection diffuses up and down depending on the construction environment of the hardener layer creation Or concentrated on the same level region and corresponding to disk-shaped radiation injection.

  In addition, since the injection nozzle opens in an oblique direction with respect to the injection rod tube wall, the rotation of the rod may be reversed or forward in the injection direction of the high-pressure jet depending on the rotation direction of the injection rod. Can do.

  That is, when the rotation of the rod is reversed in the jet direction of the high-pressure jet, the hardener jet is opposed to the cutting ground, so that the crushing force on the ground is enhanced. Since the jet adapts to the cutting ground, there is no energy consumption due to crushing, and the jet energy directly acts as a permeation propulsion force for the soil particles.

  The feature of the present invention is that a swirl flow guiding structure is formed in the material pumping flow path communicating with the core nozzle of the injection rod, thereby maintaining the natural fluidity of the high-pressure jet and improving energy efficiency and adding energy during injection. Has also been achieved.

  Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an injection rod, which is composed of a double pipe as a whole consisting of separated flow passages 12 and 13 in the rod communicating with the spray material tank via a swivel 11, and a core nozzle at the center of the tip side wall. 21, a superposition jet nozzle 2 is set in which the surrounding nozzle 22 surrounds and surrounds it, the core nozzle 21 communicates with the flow path 12, and the surrounding nozzle 22 communicates with the flow path 13.

  The flow path 12 includes a narrow-diameter portion 12a from the swivel 11 to the monitor A portion, and a wide-diameter portion 12b from the monitor A portion to the nozzle opening, and a clear water jet hole 14 set at the bottom of the tip of the wide-diameter portion 12b. At the same time, the central nozzle 21 of the superposition injection nozzle 2 set on the side wall of the tip of the monitor A is concentrated and opened. The enlarged diameter portion 12b from the portion of the monitor A to the nozzle port is not necessarily provided, and the flow path 12 is configured to have the same diameter up to the nozzle port, and the swirling flow guiding structure 3 is appropriately formed at the site. Also good.

  The fresh water ejection hole 14 opens downward via a ball valve seat 4 formed at the bottom of the tip of the enlarged diameter portion 12 b in order to close the ejection hole when the ball 41 is inserted. Is formed in an annular shape along the peripheral wall 22 of the superposition injection nozzle 2 set in the side wall portion of the monitor A and opens in communication, and the front end side is closed. It should be noted that the opening and closing of the fresh water ejection hole can be performed by a differential pressure valve, not by ball insertion. In this case, a differential pressure valve is set instead of the ball valve seat 4.

  In the flow path 12, a swirl flow guiding structure 3 is formed by a guide groove or a ridge spirally on the inner wall surface of the flow path from the vicinity of the tapered base E connecting from the narrow diameter portion 12a to the enlarged diameter portion 12b to the core nozzle. The high-pressure jet that is opened from the narrow-diameter portion 12a to the wide-diameter portion 12b is subjected to concentrated energy by the swirling flow guiding structure 3 and concentratedly injected into the core nozzle 21.

  One or a plurality of fluid guiding channels 31 formed by guide grooves or protrusions or plate blades of the swirling flow guiding structure 3 are elongated at a spiral angle as shown in FIG. The high-pressure jet is injected in an oblique direction with respect to the injection rod tube wall, and efficient orientation is performed by cutting in an oblique direction rather than perpendicular to the target ground.

  The guide ridge in the swirling flow guiding structure 3 is not limited to a strip material, and a processed spiral plate may be set to project in an auger wing shape with respect to the flow path. Moreover, if it sets only to the predetermined range of the upper part of a nuclear nozzle inlet as shown in FIG.2, FIG.3, without joining to a nuclear nozzle inlet, it will reach a nuclear nozzle inlet, maintaining a turning force by high pressure feeding. Furthermore, when the guide groove is used, various effects can be obtained by changing the cross-sectional shape of the guide groove according to the construction environment.

  Further, by configuring the swirling flow guiding structure 3 into a multi-helix structure in which a plurality of guide grooves or protrusions swirl in parallel, a unique high-pressure jet flow in which a plurality of flows 1 and 2 swirl in parallel as shown in FIG. Can be created.

  Due to the multi-helix spiral structure, a plurality of superposition jet nozzles 2 are provided with a plurality of high-pressure jets from the upper and lower stepped portions as shown in FIG. 3 or the same level portion as shown in FIG. Spray in an oblique direction.

  The curing material injection from the polymerization injection nozzle 2 is injected in an oblique direction with respect to the injection rod tube wall, so that the rotation of the injection rod during injection reverses or reverses the injection direction of the high-pressure jet. The direction can be selected, and the injection can be performed immediately in accordance with the injection construction environment.

  Such a swirl flow guiding structure 3 is provided with spiral guides or ridges or auger blades on the inner wall surface of the flow path, and as shown in FIG. It is also possible to store the shaft body in a flow path space of the tip monitor unit.

  Therefore, as shown in FIG. 5, a plurality of guide grooves or ridges 3a, 3b, 3c, and 3d are set by turning in parallel, and the openings of the flow paths formed thereby are respectively the openings of the nuclear nozzles. In this configuration, a plurality of superposition jet nozzles 2 are provided on the injection rod 1 and a high pressure jet is swirled and jetted from different angular directions, whereby a unique crushing and stirring force can be obtained.

  FIG. 6 shows a state in which the guide grooves 3a, 3b, 3c, and 3d configured in four strips run in parallel in the flow passage enlarged portion 12b as a cross-sectional perspective view of the flow passage enlarged portion. By providing the superposition jet nozzle 2 corresponding to the groove, a plurality of high-pressure swirling jets cross-stir around the surrounding soil from different angular directions, and the biased reaction force applied to the injection rod is canceled by the jet, so that the shake of the rod In this way, a uniform hardened material mixed layer is created by stable injection.

  The communication from the narrow-diameter part 12a of the flow path 12 to the enlarged-diameter part 12b is made by communicating with the monitor part A, which forms the tip of the rod through the tapered base E of the monitor A and the polymerization injection nozzle 2 is set. The outer diameter is made larger than the outer diameter of the upper rod main pipe B, and a clearance is formed between the rod main pipe B and the inner wall of the insertion hole C by insertion excavation of the monitor portion.

  Further, an outer shell 15 having the same outer diameter as that of the monitor portion A is set at predetermined intervals on the outer surface of the injection rod 1, and the outer surfaces of the set outer shells as a whole are injected rods. A spacer is formed to maintain a clearance between the outer surface of 1 and the inner wall of the insertion hole C.

  The rear end of the injection rod 1 is a swivel 11, which is connected to the corresponding portion of each flow path in the rod and the hoses 8 and 8 connected to the injection material tank and is installed on the base 6 It is supported by the drive unit 5 and the operating mechanism 7.

  The rod 1 is composed of a double pipe as a whole as described above, and its central portion is formed on the outer periphery of the flow path 12 that is switched to the fresh water supply path when excavating and descending, and to the hardener supply path when ascending and injecting the hardener. An air supply passage 13 for supplying the blast air to the surrounding nozzle 22 is formed in an annular shape.

  The ground hardening material injecting apparatus configured as described above is installed on the target ground, and firstly, lubricated clean water is supplied to the flow path 12 and ejected from the tip ejection hole 14. On the other hand, the rod is moved forward while giving an operation such as rotation, and the injection rod is inserted into the target ground G by the rotation of the excavating blade 9 of the rod crown and the injection rod 1.

  In this way, when the injection rod 1 is propelled and inserted toward the target ground G and the predetermined depth is reached, the swivel 11 is removed and the ball 3 is inserted from the connecting portion communicating with the flow path 12. The ejection hole 14 is closed by being inserted into the valve seat 4 which is conveyed and set in the ejection hole 14.

  At the same time, the hose 8 that has been supplying fresh water until then is switched to a hardener. Cement milk is used as the ground hardening material, and it is injected together with air injection from the surrounding nozzle 22 as a high pressure jet flow of 20 to 30 megapascals and a discharge amount of the hardening material of about 100 to 200 liters / minute. The ascending speed is about 15 minutes / meter.

  When the hardened material pumped to the flow path 12 reaches from the narrow diameter portion 12a to the expanded diameter portion 12b, the internal pressure diverges due to the expansion of the flow path and is guided to the tapered slope wall of the monitor A. The swirling energy is added, and the flow velocity is increased by the inner wall formed on the streamline curved surface, and the turbulent flow and flow path resistance are minimized, and the flow is conveyed by the streamline taper concentrated at the inlet of the nozzle 21. Therefore, the injection density can be sufficiently maintained even when the rod lifting time is about one-half of the conventional method.

  The air supplied to the air supply path 13 is supplied to the surrounding nozzle 22 of the superposition jet nozzle 2 and is jetted as a composite jet fluid of the hardener jet, thus coupled with the turbulent flow and the flow resistance reduction. The diameter of the core nozzle can be increased, and the hardener injection layer X having a long reach of the hardener jet can be formed in a shorter time.

  In this way, a curing swirling jet of curing material and air is jetted from the polymerization jet nozzle 2, and the injection rod 1 is rotated or reciprocated by a predetermined angle while stepping up in 15 minutes per meter in the withdrawal direction. By raising, the hardened material high-pressure jet Y drills and cuts the surrounding ground to crush the soil particles, and forms a hardened material injection layer X in a cylindrical shape along the drive locus of the injection rod 1 on the target ground G.

  Next, an injection rod is set at an adjacent position, and a hardener injection layer is similarly formed to cross-join the flank portions. Further, similar hardener injection layers are successively adjacent to each other to be predetermined. A predetermined injection layer structure is formed in parallel with the shape.

  Since the present invention is configured as described above, it prevents the pumping energy from being attenuated due to the turbulent flow caused by bending of the hardened material pumping flow path, and expands and swivels the flow path from the narrow diameter part to the large diameter part. The swirling energy can be added by the flow guide structure 3 and the inner wall formed by the tapered inclined wall 16 and the streamline curved surface 17 in the diameter-enlarged flow path can be utilized by the efficiency of doubling the pumping energy conventionally.

The example of the present invention, showing the construction state of the ground hardening material injection layer construction, and an explanatory view of the construction as seen from the side of the whole of the injection device and the ground Similarly, it shows the structure of an injection rod in which the swirling flow guiding structure according to the embodiment of the present invention is a single-strand spiral structure, and the tip monitor section in the case where the swirling flow guiding structure is set only in a predetermined range of the hardener flow path. Longitudinal cross-sectional side view with a cutout of a part of the outer portion of the injection rod to show the main structure Similarly, it shows the structure of an injection rod in which the swirling flow guiding structure according to another embodiment of the present invention is a multi-spiral spiral structure, and the swirling flow guiding structure in which the auger blade body is accommodated only in a predetermined range of the hardening material channel. Longitudinal cross-sectional side view in which a part of the outer portion of the injection rod is cut away in order to show the structure of the main part of the tip monitor part when set Similarly, in the swirl flow guiding structure, a schematic explanatory view of a multi-strand spiral structure showing the inner wall surface of the flow path in which a plurality of flows 1 and 2 swirl in parallel as a cutaway development view Similarly, it shows the structure of an injection rod in which a swirl flow guiding structure according to another embodiment of the present invention has a multi-spiral spiral structure, and the swirl flow guiding structure has a shaft body with a multi-spiral spiral blade attached to the tip. Longitudinal cross-sectional side view in which a portion of the outer portion of the injection rod is cut away in order to show the structure of the main part of the distal end monitoring unit when it is housed in the flow path space of the monitoring unit. Similarly, the swirl flow guiding structure on the inner wall surface of the flow path is configured as a four-row multi-helix structure, and the injection rod superposition injection nozzle in a state where the opening of each fluid guiding path is configured as the opening of the core nozzle, respectively. Cross section of injection rod superposition injection nozzle setting part showing structure of setting part Similarly, the structure of an injection rod having a multi-spiral structure as a swirling flow guiding structure according to an embodiment of the present invention is shown, and an injection showing the main structure of the tip monitor part when the polymerization injection nozzle is set at the same level part. Longitudinal cross section side view of rod Similarly, the nozzle setting part enlarged front view of the injection rod showing the appearance from the front of the polymerization injection nozzle

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection rod 11 Swivel mechanism 12 The flow path connected to the core nozzle 12a The narrow diameter part of the flow path connected to the core nozzle 12b The enlarged diameter part of the flow path connected to the core nozzle 13 The flow path connected to the surrounding nozzle 14 Fresh water ejection Hole 15 Outer shell set on rod 2 Polymerization injection nozzle 21 Co-axial nozzle 22 Encircling nozzle 3 Swirl flow guiding structure 3a Guide groove or protrusion 3b rotating in parallel as a multi-strand spiral structure 3b Parallel swirling as a multi-strand spiral structure Guide grooves or ridges 3c Guide grooves or ridges rotating in parallel as a multi-helix structure 3d Guide grooves or ridges rotating in parallel as a multi-helix structure 4 Ball valve seat 41 Ball 5 Injection rod drive 6 Base 7 Injection Rod operating mechanism 8 Hose connected to the spray material tank 9 Rod crown drilling blade A Rod monitor B Rod main pipe C Rod insertion hole E Tapered base G target ground X ground hardened material injection layer Y stiffeners pressure jet of Ddomonita

Claims (12)

The range from the tip monitor section to the core nozzle inlet of the material pressure feed channel connected to the core nozzle of the injection rod provided with the clear water injection hole at the tip and the polymerization injection nozzle consisting of the core nozzle and the surrounding nozzle on the side wall The injection rod formed with a swirl flow guiding structure that imparts a spiral swirling motion to the fluid to be pumped on the expanded diameter portion is rotated and lowered while ejecting fresh water from the distal end portion to determine the predetermined ground of the target ground. Inserted to the depth, closed the clear water injection hole at a predetermined depth, and while rotating the injection rod while raising the ground hardening material by high pressure from the core of the polymerization injection nozzle and air from the surrounding part, A ground hardener injection method characterized by creating a hardener injection layer The ground hardening material injecting method according to claim 1 , wherein the swirl flow guiding structure for imparting a spiral swirling motion to the pumped fluid is configured by forming a spiral guide groove or a ridge or a plate blade on the inner wall of the flow path. A swirling flow guiding structure that imparts a spiral swirling motion to the pumped fluid is formed by forming a spiral guide groove or protrusion or plate blade on the inner wall of the flow path , and a plurality of guide grooves or protrusions or plate blades are arranged in parallel. The ground hardening material injection method of Claim 1 or Claim 2 comprised to the multi-spindle spiral structure which turns. The fluid guiding flow path formed by the guide groove or the ridge of the swirling flow guiding structure or the plate blade is elongated at the spiral angle and opened to each core nozzle, and one or a plurality of high-pressure jets are applied to the injection rod tube wall. 4. The ground hardening material injecting method according to claim 1, wherein the injection port is formed in a tangential direction with respect to a concentric circular arc with an injection rod cross-sectional circle. A plurality of high-pressure jets from one or both upper and lower step parts or the same level part are jetted to the injection rod tube wall in a direction tangential to the concentric circular arc with the cross-section circle of the injection rod , and reverse to the injection direction of the high-pressure jet The ground hardening material injection method according to claim 4, wherein the injection rod is rotated in a direction to be turned. A plurality of high-pressure jets from one or upper and lower step parts or the same level part are injected in a tangential direction with respect to the concentric circular arc with the injection rod cross-sectional circle to the injection rod tube wall, and in the order of the injection direction of the high-pressure jets. The ground hardening material injection method according to claim 4, wherein the injection rod is rotated in the direction of travel. The range from the tip monitor section to the core nozzle inlet through the hardened material pumping channel communicating with the core nozzle of the injection rod provided with a clear water injection hole at the tip and a polymerization injection nozzle consisting of a core nozzle and a surrounding nozzle on the side wall The ground hardening material is characterized in that an injection rod formed with a swirling flow guiding structure for giving a spiral swirling motion to the pumped fluid is supported by a rotating vertical movement mechanism in the expanded diameter portion. Injection device 8. The ground hardening material injecting apparatus according to claim 7, wherein the swirl flow guiding structure is formed by setting a guide groove or a ridge or a plate blade in a spiral shape on the inner wall surface of the injection rod. The ground according to claim 7 or claim 8 , wherein the swirling flow guiding structure by means of spiral guide grooves or ridges or plate wings is formed into a multi-row spiral structure in which a plurality of guide grooves or ridges or plate wings swirl in parallel. Hardener injection device The fluid guide channel formed by guide grooves or ridges or Itatsubasa the helical structure extends remains the helix angle is opened to the nucleus nozzle, injection rod for one or more high pressure jets injected rod tube wall The ground hardening material injecting device according to claim 8 or 9, wherein the ground hardening material injecting device is formed in an injection port for injecting in a direction tangential to a concentric circular arc with a cross-sectional circle. A plurality of superposition jet nozzles are formed on the injection rod tube wall by extending the fluid guide passage formed by the guide grooves or protrusions of the multi-strand spiral structure or the plate blades at the spiral angle and opening the corresponding core nozzles. The ground hardening material injecting device according to claim 8, wherein the ground hardening material injecting device is configured to be provided at an upper and lower step portion or at the same level portion. The swirling flow guiding structure, according to claim 8 or claim 9 or claim 10 so as to constitute stores shaft that attached the spiral blade or multi-start helical blades core material in the channel Supesu tip monitor portion Or the ground hardening material injection | pouring apparatus of Claim 11

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