JP2007016534A - Ground hardening material injecting rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of an abrasion loss of the part and increased consumption of energy when an injection material supplied under high pressure receives resistance by acute angle bending of a flow passage since the flow passage formed of a terminal of an injection material supply passage and a nozzle structure part inflow port succeeding to this terminal conventionally bends at an acute angle in a state being close to a right angle. <P>SOLUTION: A connecting flow passage of the terminal 23 of the injection material supply passage of an injection rod and the nozzle structure part inflow port 24 of an injection nozzle, is constituted in a curved gradient, and is also constituted so as to connect the terminal of the injection material supply passage and the nozzle structure part inflow port of the injection nozzle by an attachable-detachable flexible pressure hose 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ground hardening material injection rod for use in a ground hardening material injection method for injecting a ground hardening material into a target ground for the purpose of reinforcing support of a construction foundation ground, stabilizing the ground or stopping water.

  Conventionally, ground hardening material injection for the purpose of stabilizing the ground or creating a hardened material layer for the purpose of water stoppage is to extend the reach of the hardened material jet as much as possible to create a large diameter hardened material layer. Various ideas have been devised as ideal, and one of them is a method in which the hardening material jet is encapsulated with air and protected by a polymerization injection nozzle consisting of a core nozzle and an annular nozzle surrounding it (for example, patent document) 1) has been developed.

  Also, in order to extend the jet flow path that forms the nozzle structure and extend the effective range of the jet flow, an oblique flow path that is set back in the jet direction from the inherited portion at the lower end of the hardening material flow path of the injection rod is formed. In addition, a means for forming the injection nozzle into a tapered nozzle longer than the rod radius by bending it in the injection direction while maintaining the same diameter as that of the oblique downflow channel (see, for example, Patent Document 2) has been taken.

Further, an injection rod that keeps the balance by mutually injecting in the left and right directions with the injection ports facing away from each other is illustrated in Patent Document 3 and the like.
Japanese Examined Patent Publication No. 7-100931 Japanese Examined Patent Publication No. 6-74582 Japanese Patent Publication No. 4-52333

  However, the flow path forms of the terminal of the conventional injection material supply path and the nozzle structure inlet that inherits the same are bent at an acute angle in a state close to a right angle, and the injection material supplied with high pressure is bent at an acute angle of the flow path. Therefore, there is a problem that a great amount of energy cannot be avoided due to resistance.

  In addition, the sharp bends of the flow path are subject to wear and damage due to the high pressure jet flow of the injection material, so they are integrated with the nozzle structure that requires high precision with a complex structure that is frequently repaired and replaced. It is difficult to repair the sharply bent flow path and to replace the parts, which is an economic burden.

  In order to solve this problem in response to the above-mentioned problem, the present invention is configured such that the communication flow path between the terminal of the injection material supply path of the injection rod and the nozzle structure inlet of the injection nozzle has a curved slope, It is intended to reduce the consumption of the injection material supply energy due to the flow path resistance and to reduce the load due to the high pressure jet of the injection material to the flow path.

  In addition, the terminal of the injection material supply path and the nozzle structure inlet of the injection nozzle are connected by a detachable flexible pressure hose, and the communication flow path itself is separated from the nozzle structure and the material supply path independently. It can be easily repaired and replaced.

  An embodiment of the present invention will be described below with reference to the drawings. This embodiment is merely an example, and the structure portion other than the communication flow path between the end of the material supply path and the nozzle structure portion inlet of the injection nozzle may have a different form, and the type of the injection material is not limited. Is.

  1 is an injection rod, which is composed of a triple flow pipe of an injection material supply path 2, a fresh water supply path 3, and an air supply path 4 as a whole, and a polymerization injection nozzle 21, A pair of nozzle structure portions 22, 22 forming 21 is set, and further, a fresh water injection nozzle 31 communicating with the fresh water supply path 3 is provided above the superposition injection nozzles at a predetermined interval.

  The terminal 23 of the injection material supply path 2 and the inflow port 24 of the nozzle structure portion 22 are configured to have a fitting structure in which both side ends of the flexible pressure-resistant hose 5 constituting the connecting flow path are detachably fitted. The flexible pressure-resistant hose 5 is joined to the end 23 of the injection material supply path and the end is joined to the inlet 24 of the nozzle structure portion. A road is constructed. The flexible pressure-resistant hose 5 uses a rubber hose reinforced by a core material wound with a wire.

  The superposition jet nozzles 21 and 21 have core nozzles 21a and 21a opened at the center, and surrounding nozzles 21b and 21b that surround the periphery and communicate with the air supply path 4, respectively. It communicates with a separated flow path in the rod that communicates with the spray material supply.

  As described above, the rod 1 is composed of a triple pipe as a whole, the injection material supply path 2 is formed at the center, the air supply path 4 is formed annularly on the outer periphery, and the fresh water supply path 3 is formed on the outer periphery. An air accumulator 42 such as a receiver tank is set at the end of the air supply path 4 via a check valve 41.

  In the air pressure storage portion 42, air flow paths 43 communicating with the surrounding nozzles 21 b and 21 b are set on the upper side, and check valves 44 are respectively provided to prevent backflow from the surrounding nozzles 21 b and 21 b. It is like that.

  By configuring the air accumulator 42 in this way, air corresponding to the accumulated pressure in the accumulator tank is supplied uniformly without flowing back into the flow path 43, so that injection efficiency close to atmospheric pressure can be obtained. A smooth airlift effect can also be obtained for the lifting of slime.

  The fresh water supply path 3 is configured with an outermost clearance, and opens to the fresh water injection nozzle 31 in the middle. However, the fresh water supply path 3 passes through the opening of the hardener supply path 2 and the outer space of the air pressure storage section 42 and the tip of the rod 1. The differential pressure valve 13 set in the ejection hole 12 is opened and closed by adjusting the fresh water supply pressure.

  The differential pressure valve 13 is urged upward by a spring 14 and normally opens the ejection hole 12, so that the drilling water is ejected from the ejection hole 12 and drilled down, and when the predetermined depth is reached, the fresh water supply pressure is increased. When the pressure rises above a certain level, the pressure drops against the urging force of the spring 14 and closes the ejection hole 12.

  In addition, by supplying air to the air pressure storage portion 42 during the downward drilling and drilling while injecting air from the surrounding nozzles 21b and 21b, the injection ports of the polymerization injection nozzles 21 and 21 are protected and the surrounding soil It can also contribute to advance improvement.

  The fresh water in the fresh water supply passage 3 is accumulated by the blockage of the ejection holes 12, and is injected as a high-pressure jet from the fresh water injection nozzle 31 to cut and agitate the surrounding soil, and the hardening material jet from the superposition jet nozzles 21 and 21 set in the lower part In addition to extending the reach distance, the mixing of the hardener and the surrounding soil is promoted to create a foundation for the formation of a homogeneous hardener injection layer.

  The rear end of the injection rod 1 is a swivel mechanism 11, which is connected to a corresponding portion of each flow path in the rod and a hose 8 connected to the injection material tank and is operated on the base 6. Supported by mechanism 7.

  The ground hardening material injection rod configured as described above first supplies lubricating fresh water to the flow path 3, discharges it from the injection nozzle 31 and the tip injection hole 12, and advances with respect to the injection rod 1 by the injection rod operating mechanism 7. The injection rod is inserted into the target ground G by the rotation of the excavating blade of the rod crown and the injection rod 1.

  In this way, the injection rod 1 is pushed and inserted toward the target ground G, and when the predetermined depth is reached, the fresh water supply pressure for the supply path 3 is increased, the differential pressure valve 13 is lowered, and the tip ejection hole 12 is closed, Injected from the nozzle 4 as a high-pressure jet having a discharge amount of 50 to 80 liters per minute.

  Further, cement milk as a ground hardening material is pumped into the supply path 2 as a discharge amount of 80 to 220 liters per minute at a pressure of about 400 Kg / square centimeter, respectively, from the core nozzles 21 a and 21 a of the polymerization injection nozzles 21 and 21. Inject each.

  The air supplied to the air supply path 4 as described above is accumulated in the air accumulating section 42 and is supplied from the air flow path 43 to the surrounding nozzles 21b and 21b above, respectively, as a composite jet fluid of the hardener jet. Be injected.

  In this way, each of the high pressure jets is supplied by supplying the spray material to each nozzle and stepping up and back up in about 15 minutes per meter in the removal direction while rotating or reciprocatingly rotating the injection rod 1 at a predetermined angle. Drills and cuts the surrounding ground and crushes the soil particles, and forms a column or base body X by a hardened material injection layer in a cylindrical shape along the driving locus of the injection rod 1 on the target ground G.

  Since the present invention is configured as described above, it is possible to reduce the consumption of the injection material supply energy due to the flow path resistance, and to reduce the load due to the high pressure jet of the injection material to the flow path. The path is separated from the nozzle structure and the material supply path so as to be independent, and only the same part can be repaired or replaced.

The longitudinal cross-section side view which abbreviate | omits one part and shows the principal part structure of the injection | rod rod tip monitor part by the Example of this invention The injection apparatus which shows the construction condition of the structure creation by the ground hardening material injection | pouring by the Example of this invention, and the whole side view of the ground

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection rod 11 Swivel mechanism 12 Fresh water ejection hole of rod tip 13 Differential pressure valve of rod tip 14 Spring of differential pressure valve 2 Injection material supply path 21 Polymerization injection nozzle 21a Nuclear nozzle of polymerization injection nozzle 21b Surrounding nozzle of polymerization injection nozzle 22 Polymerization Nozzle structure part of injection nozzle 23 Terminal of injection material supply path 24 Material inlet of nozzle structure part 3 Fresh water supply path 31 Fresh water injection nozzle 4 Air supply path 41 Check valve 42 of air supply path terminal 42 Air pressure storage part 43 Air storage Air flow path from pressure section 44 Check valve for air flow path 5 Flexible pressure resistant hose 6 Base 7 Injection rod operating mechanism 8 Hose connected to spray material tank A Rod monitor section G Target ground X Hardening material injection layer

Claims (3)

The ground hardening material injection rod characterized in that the connecting flow path between the end of the injection material supply path of the injection rod and the nozzle structure inlet of the injection nozzle is configured with a curved gradient. 2. The ground hardening material injection rod according to claim 1, wherein the end of the injection material supply path and the nozzle structure inlet of the injection nozzle are connected by a detachable flexible pressure hose. The ground hardening material injection rod according to claim 1 or 2, wherein the injection ports of the injection nozzle are set so as to face each other and are simultaneously injected in both the left and right directions.