JP2005180168A - Replaceable columnar hardened formation device and formation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a columnar solidified formation device and formation method capable of forming a higher strength continuous underground wall in a weak clay layer or other whole strata. <P>SOLUTION: The device is provided with a rotary percussion type drilling machine and a triple tube rod 120 drilling the ground, the triple tube rod 120 has a swivel 110 in which a compressed air injection input 118, a ultra high pressure water injection input 114, and a mortar injection opening 116 are formed, a monitor 128 in which a compressed air discharge output 122, a ultrahigh pressure water exhaust outlet 124, and a mortar discharge output 126 are formed. The compressed air and ultrahigh pressure water are circularly ejected from the compressed air exhaust output 122 and the ultrahigh pressure water discharge outlet 124. The underground is cut and crushed, slime is discharged on the ground, mortar and compressed air are ejected from the compressed air exhaust outlet 122 and the mortar discharge outlet 126 into the ground to form the columar solidified body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a columnar consolidated body forming apparatus and a method for forming a columnar solid body by injecting mortar at high pressure and switching the soil to form a new columnar consolidated body. The present invention relates to a replaceable columnar solid body forming apparatus and a forming method.

  Generally used high-pressure injection agitation method is to rotate the injection rod in the ground and pull out while mixing the ground improvement material with water or air from the injection nozzle at the tip of the injection rod in the direction perpendicular to the injection rod. This is a construction method in which the ground improvement material and the surrounding ground soil are agitated and mixed to form a cylindrical improvement body. This high-pressure jet agitation method is less affected by soil quality, can improve the ground in a wide range with a single construction, and has excellent adhesion between the improved bodies. It is often used for creation.

  However, when the conventional high-pressure jet agitation method is applied to soft ground, the ground soil and cement are mixed to form an improved body in the ground, that is, the clay particles and cement are mixed to form the improved body. Since it is formed, there is a disadvantage that the strength is extremely lowered.

  Therefore, the present invention has been made in view of such problems, and the object of the present invention is to provide an equally high strength continuous underground wall and foundation (support) pile in the soft clay layer and all the formations. It is an object to provide a columnar solid body forming apparatus and a forming method that can be formed.

In order to solve the above-mentioned problems, according to one aspect of the present invention, a rotary impact drilling machine and a triple pipe rod attached to the rotary impact drilling machine and drilling the ground are provided.
The triple tube rod communicates with the swivel formed with the compressed air inlet, the ultra high pressure water inlet, and the mortar inlet, and the compressed air outlet, the ultra high pressure water outlet, and the mortar outlet are formed. A monitor, and
Compressed air, ultra high pressure water, and mortar are injected from the compressed air inlet, ultra high pressure water inlet, and mortar inlet, respectively, and compressed air and ultra high pressure water are compressed air outlet and ultra high pressure water outlet, respectively. In addition, the ground is cut and crushed and slime is discharged to the ground, and mortar and compressed air are injected into the ground from the compressed air outlet and mortar outlet to form a columnar solid body. A columnar consolidated body forming apparatus is provided.

  Thus, by using the columnar consolidated body forming apparatus according to the present invention, ground cutting and high-pressure mortar injection are performed in a single process, and workability is good and economical. In addition, since the improved body is not formed by mixing the ground improvement material and the surrounding ground soil, the gel time can be easily adjusted even in large pore formations and formations where the flow rate of groundwater is high. Mortar, cement milk, dry Since materials such as sand are used, there is no fear of leaving the improved range, and the improved strength can be made uniform for all soil types.

  A check valve that supplies water for excavation when the ground is drilled and is closed when the excavation is completed may be attached to the lower end portion of the inner side surface of the monitor. This check valve serves to supply the drilling water in an open state when the ground is drilled. After the ground excavation is completed, the check valve is automatically closed at the time of high-pressure injection, and is injected at a high pressure only to the high-pressure injection nozzle. be able to. A bit for excavating the ground may be attached to the lowermost end of the monitor.

  Further, it is desirable that a compressed air direction changing portion for changing the direction of the compressed air is attached to the upper end portion of the outer surface of the compressed air discharge port of the triple tube rod. Further, it is desirable that the compressed air direction changing portion is mounted by being bent upward on the outer surface of the compressed air discharge port. As a result, the compressed air injected through the compressed air inlet can be discharged to the compressed air direction changing section, and the direction of the compressed air can be changed upward to facilitate the discharge of slime to the ground. .

  In addition, the installation of a compressed air direction changer at the outer upper end of the compressed air discharge port of the triple tube rod not only facilitates the discharge of slime by compressed air, but also the advantage that the ground wall of soft ground can be protected. There is.

  Thus, according to the present invention, columnar consolidated bodies can be formed in all formations, and the strength of the completed columnar consolidated bodies is improved by mixing the ground improvement material and the surrounding ground soil as in the past. It is constant regardless of the characteristics of the ground, has good adhesion to the temporary structure different from the columnar consolidated body, and can be applied by changing the mortar depending on the purpose of ground improvement It is. Furthermore, the diameter of the columnar solid can be adjusted freely from Φ800mm to Φ2000mm, and the improved strength can be adjusted arbitrarily according to the blending ratio of mortar, and the improved strength should be 90% or more of the ground strength. There is an advantage that is possible.

  In addition, when substituting a cast-in-place pile, it is not necessary to install a separate water-impervious wall on the back of the cast-in-place pile (there is no need to install a retaining plate), so the air can be compressed economically. In geology where it is impossible to install sheet piles, it can be installed instead of sheet piles, and it has the advantage of completely blocking the permeated water at the lower end, which is a problem when installing existing sheet piles.

  In addition, it has the advantage of being able to demonstrate resistance to lateral flow subjected to shear force, and can be applied by replacing the sand compaction pile method with little risk of long-term settlement.

  Further, from another viewpoint of the present invention, a step of attaching a triple pipe rod to a rotary impact type drilling machine, drilling the ground with a bit attached to the triple pipe rod, and a compressed air formed on a swivel of the triple pipe rod Compressed air, ultra-high pressure water, and mortar are injected from the inlet, ultra-high pressure water inlet, and mortar inlet, respectively, and the compressed air outlet and ultra-high pressure water drain formed on the monitor of the triple pipe rod. Compressed air and ultra-high pressure water are spouted from the outlet, the ground is cut and crushed, and slime is discharged to the ground. Compressed air and mortar are sprayed from the compressed air outlet and mortar outlet, and the columnar consolidated body is grounded. A method for forming a columnar solid body comprising the steps of:

Thus, in the method for forming a columnar solid body according to the present invention, ground cutting and high-pressure mortar injection are performed in a single process, so that the workability is good and economical. Here, the mortar can consist of cement milk or dry sand. In this case, the mortar should be used when the groundwater flow rate is within 10 ^-2 cm / sec.

In addition, it is desirable to have a mortar composition corresponding to the flow rate of groundwater. When used at a flow rate of 10 ^-1 cm / sec or more, the mortar is composed of 40 kg of cement, 60 to 120 kg of sand, 40 to 80 l of water ( Liter); and a material composed of 6 to 12 kg of bentonite, and an admixture composed of 1 to 2 liter (liter) of alumina silica and 5 to 10 kg of a quick setting agent.

  In this way, the gel time can be easily adjusted even in large pore formations and formations where the flow rate of groundwater is high, and materials such as mortar, cement milk, and dry sand are used, so the improvement strength can be applied uniformly to all soil types without worrying about leaving the improvement range. To do.

  Further, the present invention has the advantage that the amount of cement used is small compared to other soft ground treatment methods, so there is less harm to the environment, and the discharged slime can be squeezed and dehydrated within a short time, so that it can be processed quickly.

  As described above in detail, according to the present invention, a triple pipe rod is drilled to an arbitrary area to be improved, and the ground is cut and relaxed with ultra-high pressure water and compressed air while being pulled upward, and artificially submerged in the ground. After the space is formed, ground cutting and high-pressure mortar injection are performed in a single process by injecting mortar at high pressure and switching the local soil, so the workability is good and economical, regardless of the target ground High strength underground continuous walls and foundation (support) piles can be formed.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  1a to 1e are process diagrams illustrating a procedure for constructing a columnar consolidated body. 2 and 3 are longitudinal sectional views showing a triple tube rod of the columnar consolidated body forming apparatus according to the present embodiment, and FIG. 4 is a plan sectional view showing the triple tube rod. FIG. 5 is an explanatory view showing a state in which slime is discharged during the use of the columnar consolidated body forming apparatus of the present embodiment.

  As shown in FIGS. 1 to 5, the columnar consolidated body forming apparatus according to the present embodiment includes a rotary impact drilling machine M, a triple tube rod 120 attached to the rotary impact drilling machine M, The target soft ground S is drilled with a predetermined diameter, the triple tube rod 120 is inserted into the drilled portion H, and compressed air, ultra-high pressure water, and mortar are injected into the upper portion of the triple tube rod 120, respectively. A swivel 110 in which a compressed air inlet 118, an ultra high pressure water inlet 114, and a mortar inlet 116 are formed is installed, and an ultra high pressure water outlet 124, a mortar outlet 126, and A compressed air discharge port 122 is attached to the triple tube rod 120 by a monitor 128.

  From the ultra-high pressure water outlet 124 and the compressed air outlet 122, ultra-high pressure water and compressed air are rotated and jetted together, the ground is cut and crushed to discharge slime to the ground, and the mortar outlet 126 and compressed air From the discharge port 122, the mortar P and the compressed air are jetted together to form the columnar solid body 200 in the ground.

  A check valve 130 is installed at the lower end of the inner surface of the monitor 128. The check valve 130 serves to supply drilling water with the check valve 130 open when the ground is drilled. After the ground excavation is completed, the check valve 130 is automatically closed during high-pressure injection. It is a structure in which high pressure is injected only to the injection nozzle.

  Further, a bit 132 for excavating the ground is attached to the lowermost end of the monitor 128. That is, the columnar consolidated body forming apparatus according to the present embodiment is roughly composed of a rotary impact punching machine M and a triple pipe rod 120. In particular, a swivel 110 is installed at the uppermost end of the triple tube rod 120. The swivel 100 has a structure in which two compressed air inlets 118, an ultrahigh pressure water inlet 114, and a mortar inlet 116 are formed.

  Here, the triple tube rod 120 connected to the lower part of the swivel 110 is connected to the compressed air inlet 118, the ultrahigh pressure water inlet 114, and the mortar inlet 116 of the swivel 110 while the swivel 110 and the monitor 128 are connected. The compressed air discharge port 122, the ultrahigh pressure water discharge port 124, and the mortar discharge port 126 of the monitor 128 are communicated with each other so as to correspond to each other.

  The mortar discharge port 126 of the monitor 128 is formed in a diametrically outward direction on the peripheral surface thereof, and the compressed air discharge port 122 injects compressed air at a high pressure outward from the mortar discharge port 126 in the diametrical direction. It is the structure formed in.

  Further, in the triple pipe rod 120, a mortar and compressed air transfer passage 134 is formed, and an ultrahigh pressure water transfer passage 136 is formed outside the mortar and compressed air transfer passage 134. A triple-pipe structure in which a compressed air passage 138 is formed on the outside.

On the other hand, the mortar P used in the columnar consolidated body forming apparatus of the present embodiment may use cement milk, dry sand, or mortar on the ground where the flow rate of groundwater is within 10 ^-2 cm / sec. Preferably, it is desirable to change the composition according to the flow rate of groundwater. When the flow rate of groundwater is 10 ⁻¹ cm / sec or more, 40 kg of cement, 40 to 120 kg of sand, 40 to 80 l (liter) of water; It is preferable to use an admixture composed of 12 kg of material and alumina silica of 1 to 2 l (liter); and a quick setting agent of 5 to 10 kg.

  Hereinafter, a method of forming a columnar solid body using the columnar solid body formation according to the present embodiment having the above-described configuration will be described. 1a to 1e are process diagrams illustrating a procedure for constructing a columnar consolidated body. As can be seen from these drawings, the triple pipe rod 120 is installed in the rotary impact drilling machine M (FIG. 1a), the step of drilling the ground of the target soft ground S with the bit 132 (FIG. 1b), and the triple pipe rod Injecting compressed air, ultrahigh pressure water, and mortar P through compressed air inlet 118, ultrahigh pressure water inlet 114, and mortar inlet 116 formed in 120 swivels 110, respectively, and triple tube rod 120 Compressed air and ultra-high pressure water are spouted from the compressed air discharge port 122 and the ultra-high pressure water discharge port 124 formed in the monitor 128, and the ground of the drilled part H is cut and crushed to discharge slime to the ground. The mortar P and compressed air are injected together from the discharge port 126 and the compressed air discharge port 122 (FIGS. 1c and 1d: explanatory diagrams showing the state of the injection), and the columnar solids are injected into the ground. Forming the body 200 includes a (Fig. 1e) step, the.

Here, the mortar P is composed of either cement milk or dry sand. In particular, when the flow rate of groundwater is 10 ^-1 cm / sec or more, the mortar P is prepared by mixing mortar P with an admixture consisting of 10 kg of bentonite and ^{1 to} 2 l (liter) of alumina silica; It is preferable to do. That is, mortar P is composed of 40 kg cement, 60 to 120 kg sand, 40 to 80 l (liter) water, and 6 to 12 kg bentonite, 1 to 2 l (liter) alumina silica, and 5 to 10 kg quick setting agent. The admixtures can be mixed and used.

  Here, the alumina silica is a form in which amorphous silica particles having a negative electric charge are injected into water as a solvent, and is usually spherical, and -SiOH and -OH ions are double-layered on the particle surface. And has a structurally safe form with the same negative charge. Aggregation, gelation, high viscosity, etc. are carried out by the charge balance of these particles, and industrially useful alumina silica can be obtained by adjusting these appropriately.

  In particular, the reason why alumina silica is applied as the mortar of the present embodiment is that alumina silica is the content of sodium oxide, which is the most important factor in terms of rapid setting, completion control, and compressive strength, which are grouting elements. This is because various alumina silica can be developed.

  Also, the higher the content of sodium oxide, the more advantageous is the quick setting aspect, but the compressive strength tends to decrease. The lower the content of sodium oxide, the more favorable it is in terms of completeness and compressive strength. Therefore, not only can alumina silica be applied in various ways by the grouting method, but alumina silica is not suitable for soil contamination due to unconsolidation. This is because it has excellent durability and environmentally friendly characteristics.

  In the columnar solid forming method according to the present embodiment, first, the triple pipe rod 120 is mounted on the rotary impact drilling machine M, and then drilled to the arbitrary soft ground S to be improved with the triple pipe rod 120. To do. Next, compressed air, ultrahigh pressure water, and mortar P are injected from the compressed air inlet 118, the ultrahigh pressure water inlet 114, and the mortar inlet 116 of the swivel 110 while pulling the triple tube rod 120 upward. . Then, the ground is cut and relaxed while jetting ultrahigh pressure water and compressed air through the compressed air discharge port 122 and the ultrahigh pressure water discharge port 124 to artificially form a space in the ground.

  After that, the mortar P is injected at high pressure through the mortar outlet 126 located below the triple pipe rod 120 and is switched to the local soil, thereby forming a new columnar solid body 200 in the ground. And the foundation pile.

  At this time, in the lower part of the triple tube rod 120, the mortar P made of any one of mortar, cement milk, and dry sand is jetted in parallel with the compressed air through the compressed air outlet 122 and the mortar outlet 126. .

Here, mortar P can be used until the flow rate of ground water is generally up to 10 ^-2 cm / sec. However, when the flow rate is 10 ^-1 cm / sec or more, sand and cement can be mixed depending on the mixing ratio of mortar P. After mixing, the admixture of bentonite, alumina silica and quick setting agent must be mixed and used. In particular, the blending ratio with mortar P is as follows: cement 40 kg, sand 60 to 120 kg, water 40 to 80 l (liter); bentonite 6 to 12 kg, alumina silica 1 to 2, quick setting agent 5 to 10 kg (one person: WGS-CS).

  That is, the triple tube rod 120 rotates and jets ultrahigh pressure water together with the compressed air through the two compressed air discharge ports 122 and the ultrahigh pressure water discharge port 124 attached to the triple tube rod 120 by the monitor 128, After cutting and crushing the inside, the local soil of the soft ground S positioned in the ground is switched by compressed air and mortar P, and a new columnar solid body 200 is formed in the ground. The combined body 200 can be used in various ways for underground continuous walls and foundation piles.

  On the other hand, as described above, slime is generated by cutting and crushing the ground with ultra-high pressure water and compressed air. Such slime is discharged to the ground through the outside of the triple tube rod 120. In this way, most of the slime that has flowed out to the top is water and local soil, and the discharged slime can be quickly processed and squeezed and dehydrated in a short time using a squeezing dehydrator (not shown). The water should be reused, and the cake, which is the slime from which water has been drained, should be a separate sand.

  Below, the slime process using a columnar solid body formation apparatus is demonstrated in detail. As shown in FIGS. 3 and 4, a compressed air direction changing portion D is installed at the outer upper end of the compressed air discharge port 122 of the triple pipe load 120 of the columnar solid forming apparatus according to the present embodiment. That is, the compressed air direction changing portion D is installed at the outer upper end of the compressed air discharge port 122 and installed in a shape that is bent at a right angle outwardly from the compressed air discharge port 122.

  Here, a compressed air direction changing portion D is installed at the outer upper end of the compressed air discharge port 122 so that the compressed air injected through the compressed air injection port 118 is discharged to the compressed air direction changing portion D. It is characterized by changing the direction to facilitate slime discharge.

  In particular, the slime discharge using the columnar consolidated body forming apparatus according to the present embodiment having the above-described configuration is as shown in FIG. 5 because the target ground is the soft ground S when the slime is discharged. Although the empty wall collapses and slime discharge is not smooth, compressed air is injected from the lower part into the passage where the slime is discharged during slime discharge, and the slime can be easily discharged.

In other words, even if the vacant wall of the target ground collapses, when the slime is discharged, compressed air is discharged from the lower part through the compressed air redirecting part D, and the compressed air disturbs the sediment that has collapsed due to high pressure, or the slime is lowered. As the compressed air is pushed up, the slime can be discharged smoothly.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention is applicable to a columnar consolidated body forming apparatus and a forming method, and in particular, a new columnar consolidated body is formed by spraying mortar at high pressure to switch the local soil, The present invention can be applied to a replaceable columnar consolidated body forming apparatus and forming method for forming a foundation (support) pile.

It is process explanatory drawing at the time of installing the triple pipe rod in the rotary impact type drilling machine, showing the procedure for constructing the columnar consolidated body according to the present embodiment. It is process explanatory drawing at the time of drilling the underground of an object soft ground with a bit, showing the procedure which constructs a columnar solid object by this embodiment. It is process explanatory drawing at the time of discharging the mortar and compressed air to the drilling site | part, showing the procedure which constructs a columnar solid object by this Embodiment. It is a detailed explanatory view at the time of injecting mortar and compressed air together, showing the procedure for constructing a columnar consolidated body according to the present embodiment. It is process explanatory drawing at the time of forming the columnar solid object in the ground of the object soft ground, showing the procedure which constructs the columnar solid object by this embodiment. It is a longitudinal cross-sectional view which shows the triple tube rod of the columnar solid body formation apparatus by this Embodiment. It is a longitudinal cross-sectional view which shows the triple tube rod of the columnar solid body formation apparatus by this Embodiment. It is a plane sectional view showing the triple tube rod of the columnar consolidated body forming device according to the present embodiment. It is explanatory drawing which shows the state in which slime is discharged | emitted in the middle of use of the columnar solid body formation apparatus of this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 110 Swivel 114 Super high pressure water inlet 116 Mortar inlet 118 Compressed air inlet 120 Triple pipe rod 122 Compressed air outlet 124 Super high pressure water outlet 126 Mortar outlet 128 Monitor 130 Check valve 132 Bit 134 Mortar transfer passage 136 Super high pressure Water transfer passage 138 Compressed air transfer passage 200 Columnar high body D Compressed air direction change part H Drilling part M Rotating impact type punch P Mortar S Soft ground

Claims (10)

A rotary impact punch,
A triple pipe rod attached to the rotary impact drilling machine and drilling the ground;
With
The triple tube rod is
A swivel formed with a compressed air inlet, an ultra-high pressure water inlet, and a mortar inlet;
A monitor communicated with each of the swivels and formed with a compressed air outlet, an ultra-high pressure water outlet, and a mortar outlet;
Have
Compressed air, ultra-high pressure water, and mortar are respectively injected from the compressed air inlet, the ultra-high pressure water inlet, and the mortar inlet, and the compressed air and the ultra-high pressure water are injected into the compressed air outlet. In addition, the ground is cut and crushed and the slime is discharged to the ground, and the mortar and the compressed air are injected into the ground from the compressed air outlet and the mortar outlet. A columnar solid body forming apparatus characterized by forming a columnar solid body.   The columnar consolidated body forming apparatus according to claim 1, wherein a check valve that supplies water for excavation when the ground is drilled and is closed when the excavation is completed is attached to a lower end portion of the inner surface of the monitor.   The columnar solid body forming apparatus according to claim 1 or 2, wherein a bit for excavating the ground is attached to the lowermost end of the monitor.   4. The compressed air direction changing portion for changing the direction of the compressed air is attached to an upper end portion of the outer surface of the compressed air discharge port of the triple pipe rod. Columnar solid body forming apparatus according to the above.   The columnar solid body forming device according to claim 4, wherein the compressed air direction changing portion is mounted by being bent upward at an outer surface of the compressed air discharge port. Attaching a triple pipe rod to a rotary impact drilling machine, and drilling the ground with a bit attached to the triple pipe rod;
Injecting compressed air, ultrahigh pressure water, and mortar, respectively, from a compressed air inlet, an ultrahigh pressure water inlet, and a mortar inlet formed in the swivel of the triple tube rod;
The compressed air and the ultra-high pressure water are rotated and jetted from the compressed air outlet and the ultra-high pressure water outlet formed in the monitor of the triple pipe rod, the ground is cut and crushed, and the slime is discharged to the ground. Injecting the compressed air and the mortar from an air outlet and the mortar outlet to form a columnar solid in the ground;
A method for forming a columnar consolidated body, comprising:   The columnar solid body forming method according to claim 6, wherein the mortar is made of cement milk or dry sand. The columnar solid body forming method according to claim 6 or 7, wherein the mortar is used within a flow rate of ground water of ^10-2 cm / sec or less.   The mortar is composed of 40 kg cement, 60 to 120 kg sand, 40 to 80 l (liter) water, and 6 to 12 kg bentonite, and 1 to 2 l (liter) alumina silica; and 5 to 10 kg quick setting agent. The method for forming a columnar consolidated body according to claim 6, wherein an agent is mixed. The columnar solid body forming method according to claim 9, wherein the mortar is used at a flow rate of ground water of 10 ^-1 cm / sec or more.

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