JP2005023786A - High pressure jet ejecting and mixing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a pull up speed by enhancing a cutting ability by a super high pressure water thereby improving the working performance. <P>SOLUTION: A high pressure water nozzle and an air nozzle are combined together at the tip of a filling pipe 1 and a jet nozzle 11 capable of cutting the sediment in a predetermined range for the land preparation is provided. Underneath the jet nozzle 11, a monitor 1b provided with a hardener nozzle 12 ejecting the hardener is installed. In each passage of the body portion 1a of the filling pipe at the top of the filling pipe 1, a high pressure jet ejecting, mixing and treating equipment provided with a filling pipe swivel 1c sending ultra high pressure water, compressed air and a hardening material is employed; the filling pipe 1 is rotated and raised up; ultra high pressure water 3 accompanied with compressed air2 is ejected from the jet nozzle 11 to the ground for cutting the ground; the hardener 5 is filled and a circular column-shaped solid body is created. The jet nozzles 11 are installed as a pair so as to mutually face to opposite direction in the direction at a right angle to the filling pipe 1; the compressed air is sent by another system line with respect to each jet nozzle thereby cutting the ground at the same time in two directions. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a so-called jet grouting method that is capable of forming a high quality ground improvement body that is uniform in shape, in the ground hardening material injection method that is constructed for the purpose of soft ground improvement, construction structure foundations, etc. The present invention relates to a high-pressure jet jet mixing method used.

  The high-pressure jet injection mixing method destroys the structure of the ground by powerful energy obtained by applying high pressure to water, creates an artificial space in the ground by discharging slime to the surface, and fills with hardener. A strong solid body.

  As shown in FIG. 8, a triple pipe is used as the injection pipe 1, ultrahigh pressure water 3 accompanied with compressed air 2 is rotated and ejected to the ground to cut the ground, and the slime 4 is discharged to the ground surface. A triple pipe construction method (column jet grouting method) in which the hardener 5 is simultaneously filled to form a cylindrical solid body will be described.

  As shown in FIG. 9, the injection tube 1 has a monitor 1b attached to the tip of an injection tube body 1a having an ultra-high pressure water channel 6, a compressed air channel 7, and a hardening material channel 8, and is attached to the top. An injection pipe swivel 1c for sending ultrahigh pressure water, compressed air, and a hardener is provided in each flow path of the injection pipe main body 1a.

  In the monitor 1b, a high-pressure water nozzle 9 and an air nozzle 10 are combined, and a super-high-pressure water 3 and compressed air 2 are jetted at the same time to provide a jet nozzle 11 for cutting earth and sand within a predetermined formation range. A curing material nozzle 12 for injecting the curing material 5 was provided. In the figure, 13 is a tip shoe.

  As shown in Fig. 10, the triple pipe method (column jet grouting method) is constructed as shown in Fig. 11, with a boring machine 14 using a casing pipe 17 with a metal crown 15 and a stabilizer 16 at the tip. In addition, the injection pipe body 1a of the injection pipe 1 using a triple pipe is installed in the casing pipe 17 with a truck crane or the like.

  As shown in FIG. 12, the casing pipe 17 is pulled out (the casing pipe may be left depending on the situation), the building machine 18 is installed as shown in FIG. 13, and the injection pipe swivel is installed at the upper end of the injection pipe main body 1a. 1c is installed, compressed air 2, ultra-high pressure water 3, and hardener 5 are poured out and pulled up while rotating the injection tube 1, and the column construction is completed as shown in FIG.

  In this way, the injection nozzle 11 is injected with ultra-high pressure water surrounded by compressed air, which disturbs the soil particles in the ground and creates an artificial space. The hardened material extracted from the material nozzle 12 is filled. The compressed air injected from the periphery of the injection nozzle 11 is regarded as one of the factors indispensable for providing an exquisite effect called an air lift effect.

However, in the conventional triple pipe method (column jet grouting method), there is only one injection nozzle 11 and the ground cutting ability is limited, so the pulling speed of the injection tube 1 is limited. By the way, the capacity of the ultra-high pressure pump that is encapsulated with compressed air around the injection nozzle 11 and injected is assumed to be 70 liters / min 400 kgf / cm ² , and the rotation speed is 5-6 rpm. 16-25min / m was considered appropriate.

  In Japanese Patent Publication No. 6-54007, a side wall of a monitor installed at the tip of an injection rod having four flow paths having a polymerization structure is connected to each flow path in the rod and has a polymerization structure that is polymerized at an injection port. One having two upper and lower spray nozzles is shown.

  These two nozzles eject pressurized gas from the surrounding nozzles of each nozzle, ultra-high pressure water from the upper nozzle, and ultra-high pressure curing material from the lower nozzle.

  Accordingly, the one disclosed in Japanese Patent Publication No. 6-54007 has the effect that the hardened material can be injected at an ultra-high pressure, but the cutting ability with the ultra-high-pressure water that is encapsulated with the compressed air and injected is not improved. Absent.

  The object of the present invention is to provide a high-pressure jet injection mixing method that improves the construction performance because the pulling speed can be increased by eliminating the disadvantages of the conventional example and increasing the cutting ability with ultra-high pressure water. There is to do.

  In order to achieve the above object, according to the present invention, firstly, a high pressure water nozzle and an air nozzle are combined at the tip of an injection pipe having a flow path of ultra high pressure water, compressed air and a curing material, and the high pressure water and the compressed air are supplied. At the same time, install a monitor equipped with a spray nozzle that cuts the soil within the predetermined formation range and a hardener nozzle that sprays the hardener below it, and superimposes each flow path of the main body of the injection pipe at the top of the injection pipe. Using a high-pressure jet injection mixing processing device equipped with an injection pipe swivel that sends high-pressure water, compressed air, and hardener, when the injection pipe is rotated and pulled up, ultra-high pressure water with compressed air is transferred from the injection nozzle to the ground. In the high-pressure jet injection mixing method in which the ground is cut and filled with a hardener to form a cylindrical solid body, the injection nozzles are directed in opposite directions in the direction perpendicular to the axis of the injection pipe. Paired and compressed Gas sends in a different system line for each injection nozzle, it is intended to be required to simultaneously cut two directions.

  Secondly, the gist is to provide a sensor such as an air flow rate / pressure gauge for each line for monitoring and control.

  According to the first aspect of the present invention, the injection nozzles that combine the high-pressure water nozzle and the air nozzle in the monitor are provided in pairs so as to face each other in the direction perpendicular to the injection tube axis. The cutting ability of the ground with ultra-high pressure water surrounded by compressed air is doubled, and as a result, there is no problem even if the pulling time is increased by increasing the pulling speed of the injection pipe to about twice, and the construction performance is improved. Can be raised.

  Also, by increasing the cutting ability in this way, in some cases, hardened materials can be used that are more serious and more viscous than conventional blends, and since the hardened material is less diluted, the yield in the ground is good. The quality (strength) can be secured by pulling up quickly.

  Further, in addition to the above action, the injection nozzle combining the two high-pressure water nozzles and the air nozzle has a unique flow path for the compressed air flow path. Even if the nozzle is closed, the pressure difference due to the blocking does not affect other injection nozzles. In this way, it becomes possible to adjust the air volume and pressure for each injection nozzle during the creation of a single pipe depending on the ground and depth.

  In addition, the structure of a pipe | tube can be simplified by comprising an injection pipe main-body part with the perforated pipe formed by arranging the compressed air flow path and the hardening | curing material flow path around the center ultra-high pressure water flow path.

  Furthermore, the injection nozzles provided in pairs so as to be directed in opposite directions to each other in the direction perpendicular to the injection tube axis are slightly shifted in position up and down, so that when the injection tube is rotated, the superposed air is compressed by compressed air. The cutting plane of the ground with high-pressure water does not overlap completely, so that the spread can be ensured vertically, and synergistic action can be expected because there is no separation between the top and bottom.

  As described above, the high-pressure jet jet mixing treatment method of the present invention can increase the cutting speed with ultra-high pressure water, thereby increasing the pulling speed, thereby improving the construction performance.

  Hereinafter, embodiments of the present invention will be described in detail. First, the high-pressure jet injection mixing method of the present invention will be described with reference to FIG. 1. Basically, the construction procedure of the triple pipe method (column jet grouting method) described in the above-described conventional example is the same, and the ultra-high pressure water 3, A jet nozzle that combines high-pressure water nozzle and air nozzle at the tip of an injection pipe 1 having a flow path of compressed air 2 and hardened material 5, and jets high-pressure water and compressed air at the same time to cut the soil in a predetermined formation range. 11 is provided, and a monitor 1b provided with a curing material nozzle 12 for injecting the curing material 5 is attached below the injection nozzle 11, and an ultrahigh pressure is applied to each flow path of the injection tube main body 1a at the top of the injection tube main body 1a. Using a high-pressure jet injection mixing processing apparatus provided with an injection pipe swivel 1c for feeding water, compressed air, and hardener, when the injection pipe 1 is pulled up, ultra-high pressure water 3 with compressed air 2 is discharged from the injection nozzle 11. Rotating and spraying on the ground By cutting the ground, the cured material 5 with discharging the slime to the surface is simultaneously filled, it is to construct a cylindrical solid sintered body.

  In the present invention, the injection nozzles 11 are provided in pairs so as to face each other in the direction perpendicular to the axis of the injection tube 1, and the ultra-high pressure water 3 accompanied with the compressed air 2 is injected from the two injection nozzles 11. Therefore, the two directions were cut simultaneously.

  The compressed air 2 is sent to each injection nozzle 11 through a separate system line, and sensors 19a, 19b such as an air volume / pressure gauge are provided for each line for monitoring / control.

  Next, an apparatus for performing such a method will be described. FIG. 2 is a longitudinal side view showing the first embodiment of the injection tube 1, wherein 1a is an injection tube main body, 1b is a monitor attached to the lower end thereof, and 1c is an injection tube swivel provided on the top of the injection tube main body 1a. It is.

  The injection pipe main body 1a includes a quadruple of an inner pipe 20 that forms an ultra-high pressure water flow path 6, a middle inner pipe 21 that forms a compressed air flow path 7, a middle and outer pipe 22, and an outer pipe 23 that forms a hardening material flow path 8. Consists of tubes.

  Although the monitor 1b and the injection tube swivel 1c are not shown, they are detachably fitted to the injection tube main body 1a by coupling, and are connected to the inner tube 20, the inner / inner tube 21, the inner / outer tube 22, and the outer tube 23. It is a structure which has a pipe | tube with which an edge part fits.

  In the monitor 1b, the injection nozzle 11 combining the high-pressure water nozzle 9 and the air nozzle 10 is paired so as to face each other in the direction perpendicular to the axis of the injection pipe 1, and the position is slightly shifted up and down. The high-pressure water nozzle 9 is connected to the ultra-high-pressure water flow path 6 of the inner pipe 20 with both of the above-mentioned injection nozzles 11, and the air nozzle 10 is one of the injection nozzles 11 (upper side in the drawing) with the inner-inner pipe. The other communicated with the compressed air flow path 7 in 21 and the compressed air flow path 7 in the inner / outer tube 22 respectively.

  Further, as shown in FIG. 2, the hardening material flow path 8 formed by the outer tube 23 branches into each hole 24a of the porous tube 24 in the monitor 1b, avoiding the injection nozzle 11, and the lower hardening material nozzle 12 below. Communicate with. In the figure, 25 is a metal crown.

  The injection tube swivel 1c includes a high pressure water injection port 26 communicating with the inner tube 20 forming the ultra high pressure water flow channel 6, a compressed air injection port 27a communicating with the inner inner tube 21 forming the compressed air flow channel 7, and a compressed air flow. A compressed air inlet 27b that communicates with the inner and outer tubes 22 that form the passage 7 and a hardener inlet 28 that communicates with the outer tube 23 that forms the hardener channel 8, and these high-pressure water inlets 26, A swivel mechanism is set by a bearing or an O-ring so that the air inlets 27a and 27b and the hardener inlet 28 can be rotated independently of each other.

  5 and 6 are longitudinal side views showing a second embodiment of the injection tube 1, and the injection tube main body 1a is formed with a hole 29a forming an ultrahigh pressure water channel 6 in the center, and a compressed air flow around it. The hole 29b, 29b 'forming the path 7 and the hole 29c forming the hardener flow path 8 are formed by a perforated tube 29 formed side by side. In the illustrated example, the holes 29b and 29b 'are arranged on the left and right sides of the hole 29a, and two holes 29c are formed side by side between the holes 29b and 29b'.

  Also in this embodiment, in the monitor 1b, the injection nozzle 11 that combines the high pressure water nozzle 9 and the air nozzle 10 is paired so as to face each other in the direction perpendicular to the axis of the injection tube 1, and the position is slightly shifted up and down. The high-pressure water nozzle 9 communicates with the hole 29a in which both the injection nozzles 11 form the ultra-high-pressure water flow path 6 in accordance with the injection pipe main body 1a formed by the porous pipe 29, and the air nozzle Reference numeral 10 denotes one of the injection nozzles 11 (upper side in the drawing) communicated with a hole 29b forming the compressed air flow path 7, and the other communicated with a hole 29b 'forming the compressed air flow path 7. (Not shown)

  Further, in the monitor 1b, a curing material nozzle 12 is provided below the two injection nozzles 11. The curing material nozzle 12 is communicated with a hole 29c that forms the curing material flow path 8. In this embodiment, a metal crown 25 is provided at the tip of the monitor 1b.

  The injection tube swivel 1c includes a high-pressure water injection port 26 that communicates with a hole 29a that forms the ultrahigh-pressure water flow channel 6 of the injection tube main body 1a, a compressed air injection port 27a that communicates with a hole 29b that forms the compressed air flow channel 7, A compressed air inlet 27b that communicates with a hole 29b that forms a compressed air flow path 7, and a hardener inlet 28 that communicates with a hole 29c that forms a hardened material flow path 8, and these high-pressure water inlet 26, The swivel mechanism is set so that the compressed air inlets 27a and 27b and the hardener inlet 28 can rotate independently of each other.

  In the case of the second embodiment as well, a configuration in which the monitor 1b and the injection tube swivel 1c coupling are detachably fitted to the injection tube main body 1a as in the first embodiment can be adopted.

It is explanatory drawing which shows one Embodiment of the high pressure jet injection mixing processing method of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view with one part omitted showing a first embodiment of a high-pressure jet injection mixing treatment apparatus used in the high-pressure jet injection mixing treatment method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a vertical side view of the monitor part which shows 1st Embodiment of the high pressure jet injection mixing processing apparatus used with the high pressure jet injection mixing processing method of this invention. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is the vertical side view which a part of which showed 2nd Embodiment of the high pressure jet injection mixing processing apparatus used with the high pressure jet injection mixing processing method of this invention was abbreviate | omitted. FIG. 6 is a sectional view taken along line B-B in FIG. 5. It is CC sectional view taken on the line of FIG. It is a vertical side view which shows a triple pipe construction method (column jet grout construction method). It is a vertical side view of the triple pipe used by the triple pipe construction method (column jet grouting method). It is a vertical side view of the 1st process of a triple pipe construction method (column jet grout construction method). It is a vertical side view of the 2nd process of a triple pipe construction method (column jet grouting method). It is a vertical side view of the 3rd process of a triple pipe construction method (column jet grouting method). It is a vertical side view of the 4th process of a triple pipe construction method (column jet grout construction method). It is a vertical side view of the 5th process of a triple pipe construction method (column jet grouting method).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Injection pipe 1a ... Injection pipe main-body part 1b ... Monitor 1c ... Injection pipe swivel 2 ... Compressed air 3 ... Super-high pressure water 4 ... Slime
DESCRIPTION OF SYMBOLS 5 ... Hardening material 6 ... Super-high pressure water flow path 7 ... Compressed air flow path 8 ... Hardening material flow path 9 ... High pressure water nozzle 10 ... Air nozzle
11 ... Injection nozzle 12 ... Curing material nozzle
13 ... Tip shoe 14 ... Boring machine
15 ... Metal Crown 16 ... Stabilizer
17 ... Casing pipe 18 ... Creation machine
19a, 19b ... sensor 20 ... inner tube
21 ... Inner / outer tube 22 ... Outer / outer tube
23 ... Outer tube 24 ... Porous tube
25… Metal crown 26… High pressure water inlet
27a, 27b ... compressed air inlet 28 ... hardener inlet
29 ... porous tube 29a, 29b, 29b ', 29c ... hole

Claims (2)

  Injecting high pressure water and compressed air at the tip of an injection pipe with a flow path for ultra-high pressure water, compressed air, and hardened material, and simultaneously jetting high pressure water and compressed air to cut the soil within a predetermined range Attach a nozzle and a monitor with a curing material nozzle that sprays the curing material below it, and an injection tube swivel that sends ultra-high pressure water, compressed air, and curing material to each flow path of the injection tube main body at the top of the injection tube When using the provided high-pressure jet injection mixing treatment device, when rotating the injection tube and pulling it up, ultra-high pressure water with compressed air is jetted from the injection nozzle to the ground and the ground is cut and filled with a hardener, In the high-pressure jet injection mixing method for forming a cylindrical solid body, the injection nozzles are provided in pairs so as to face each other in the direction perpendicular to the axis of the injection pipe, and compressed air is supplied to each injection nozzle. Separate system line Feed, high-pressure jet mixing processing method characterized by simultaneously cutting the two directions.   The high-pressure jet injection mixing method according to claim 1, wherein a sensor such as an air flow rate / pressure gauge is provided for each line for monitoring and control.

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