JP4632295B2 - Construction method of solidified pile by double streamline jet. - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a method for creating a solidified pile that is suitable for coherent construction using a double stream line jet with increased construction speed, particularly for making a solidified pile in close contact with an existing structure.

  One of the ground improvement methods is the solidification pile construction method. For example, as shown in FIG. 7, the solidification pile construction method rotates the rotary shaft 16 with the tip of the mechanical stirring device 10 aligned with the core of the column to be constructed, and radiates to the lower portion of the rotary shaft 16. The solidification material is discharged from the solidification material discharge nozzle 131 or 141 attached to a predetermined position of the rotation shaft 16 in the rotation area of the one or more stirring blades 12a and 12b and the surrounding ground. In this method, penetration is carried out while stirring and mixing, discharge is stopped when the design depth is reached, the rotating shaft 16 is rotated or reversed as it is, and further pulled up into the ground while stirring and mixing to create a columnar body. In FIG. 7, reference numeral 121 denotes an excavation bit.

Normally, the solidified material is discharged from the solidified material discharge nozzle 131 when discharged in the penetration step, and is discharged from the solidified material discharge nozzle 141 when discharged in the lifting step. In addition, depending on the soil soil, the ground is loosened in advance by a wing or a pre-jet in the intrusion process, and in the lifting process, the solidified material is stirred and mixed with the in-situ soil while forming a spiral jet flow from the solidified material discharge nozzle. Homogeneous solidified piles were created.
JP-A-9-41357 (Claim 1, FIG. 1) JP-A-6-49834 (Claim 1, FIG. 2)

  However, in the pulling process, in the method (one-line flow jet method) in which the solidified pile is formed while stirring and mixing the solidified material with the original soil while forming the spiral jet flow from one solidified material discharge nozzle, the construction speed is In order to increase the pitch, the pitch of the spiral path of the solidification material discharge nozzle becomes coarse when the pulling speed is increased, and a uniform solidified pile cannot be formed. Moreover, since the reach | attainment distance of the jet will fall when the rotation speed is raised, there existed a problem that the solidification process pile diameter became small. In addition, although a method has been proposed in which a solidified pile is formed by mixing the solidified material from the two solidified material discharge nozzles facing in the opposite direction while mixing with the in-situ soil while forming a double-track flow jet, The rotation speed and pulling speed were not strictly determined in relation to the spiral trajectory of the solidifying material discharge nozzle. For this reason, there existed a problem that a construction speed became slow or a useless construction was performed.

  Accordingly, an object of the present invention is to provide a method for forming a solidified pile by a double stream line jet capable of executing a homogeneous solidified pile with a shorter construction time.

  Under such circumstances, the present inventors conducted extensive studies, and as a result, obtained the knowledge that the pitch of the spiral locus of the solidifying material discharge nozzle is preferably 2.0 to 5.0 cm from a huge amount of past data. When the single-line jet method is performed at a constant pitch selected from the range of 2.0 to 5.0 cm, there is a limit to increasing the construction speed, and the gap between the preceding jets is filled with the following jets. Therefore, the construction speed can be increased, and therefore, a double flow number jet for discharging the solidified material from two or more solidified material discharge nozzles is formed, and the trajectory pitch of the solidified material discharge nozzle is 2.0-5. If the rotation speed of the rotating shaft and the pulling speed are determined so as to be a constant value P selected from the range of 0 cm, it is possible to construct a homogenized solidified pile with reduced construction time. Existing structure It found such that a suitable method to contact construction for Construction in close contact with the object, and have completed the present invention.

That is, according to the present invention, in the step of penetrating the rotating shaft, when discharging the solidified material from the discharge nozzle, penetrating while performing water injection from the tip of the rotating shaft, and pulling up while rotating the rotating shaft, The solidification material is discharged from three or four solidification material discharge nozzles attached to the position of the solid material in the horizontal direction while forming a double-flow number jet, and mixed with the original soil to create a solidified pile. The rotation speed of the rotating shaft and the pulling speed are determined so that the pitch of the locus formed by the solidifying material discharge nozzle becomes a constant value P selected from the range of 2.0 to 5.0 cm. A method for creating a solidified pile by means of a double streamline jet is provided.

Further, the present invention is the penetration process of the rotary shaft, stop the discharge of the solidified material of the discharge nozzle, it penetrates from the tip end of the rotating shaft while performing water injection, when pulled while rotating the rotation shaft, the vertical axis of rotation It is a method of creating a solidified pile by discharging solidified material from two solidified material discharge nozzles attached at different positions in the horizontal direction while forming a double flow number jet and stirring and mixing with the in situ soil. The rotation speed of the rotating shaft and the pulling speed are determined so that the pitch of the locus formed by the solidifying material discharge nozzle becomes a constant value P selected from the range of 2.0 to 5.0 cm. there is provided a reclamation method of solidification pile by the multi streamlined jet.

Further, the present invention, the solidifying material discharge nozzle is a two installed in 2P vertically spaced, the double-flow line jets, characterized in that the spaced apart 180 degrees in the rotational direction It provides a method for creating a solidified pile by means of

Further, the present invention is to provide a reclamation method for solidification pile by the double flow lines jets, characterized in that the solidification pile a contact construction for Construction in close contact to the existing structures.

  According to the solidification pile construction method using the double stream line jet of the present invention, it is possible to construct a homogeneous solidification pile with shortening the construction time. Moreover, since the rotation speed and pulling speed of a rotating shaft can be suitably determined in the range from which the pitch of the locus | trajectory of a solidification material discharge nozzle becomes the fixed value P chosen from the range of 2.0-5.0 cm, between existing structures It is possible to flexibly deal with cases where there is a limit to the diameter of the pile, such as close contact construction in which solidified piles are closely attached. Moreover, since the installation positions of the plurality of solidifying material discharge nozzles can be selected in various ways, the degree of freedom in designing the construction machine can be increased. In addition, when solidifying piles are formed in close contact with existing structures by two solidifying material discharge nozzles separated by 180 degrees in the rotation direction, solidified piles with high dimensional stability without shaft runout are created. Can do.

  The solidification pile construction method (hereinafter also referred to as a double-flow number jet method) using the double-flow line jet according to the present invention includes two or more solidifications attached to predetermined positions of the rotary shaft when the rotary shaft is pulled up while rotating. A solidified material is discharged from a material discharge nozzle (hereinafter also simply referred to as a discharge nozzle) while forming a double-flow number jet, and is agitated and mixed with the in-situ soil to form a solidified pile. This is performed by determining the rotation speed and pulling speed of the rotary shaft so that the pitch of the locus becomes a constant value P selected from the range of 2.0 to 5.0 cm. If the pitch of the trajectory of the discharge nozzle is less than 2.0 cm, the supply of the solidified material becomes excessive, the construction speed is slowed and the construction cost is increased, and if the pitch of the trajectory exceeds 5.0 cm , Homogeneous solidified piles cannot be created. In addition, the preferable range of the pitch P of the locus | trajectory of the solidification material discharge nozzle is 2.0-4.0 cm, More preferably, it is 2.5 cm.

  The construction apparatus used in the double stream line jet method of the present invention is not particularly limited as long as it has two or more discharge nozzles at a predetermined position of the rotating shaft. The discharge nozzle is usually attached to the horizontal blade so that the jet flow is discharged radially outward. A preferable number of the discharge nozzles is 2 to 4, particularly preferably 2 to 3, and more preferably 2. The installation positions in the vertical direction of the discharge nozzles may all be in the same horizontal plane or may be different positions, but the installation position in the rotational direction is specified as will be described later.

  In the present invention, the form of the two discharge nozzles is not particularly limited, and examples thereof include a solidified material discharge nozzle and a compressed air-enclosed solidified material discharge nozzle. Among these, if the compressed air surrounding solidifying material discharge nozzle is used, the cutting distance (reconstructed diameter) can be dramatically improved. The compressed air-enclosed solidified material discharge nozzle is a double-discharge nozzle in which an annular compressed air injection section is formed around the central solidified material discharge nozzle. The solidifying material discharge nozzle may be a water discharge nozzle by switching the supply source. As an example of the construction method of the double discharge nozzle, for example, if the ground is cut while discharging water and compressed air from the two discharge nozzles at the time of penetration, and the solidified material is discharged from the same two discharge nozzles at the time of pulling out It is possible to efficiently create a solidified pile.

  In the present invention, in the case of a so-called upper and lower nozzles in which two discharge nozzles are set apart in the vertical direction, for example, the upper nozzle discharges an ultrahigh pressure, small flow rate solidified material slurry such as 40 MPa, and the lower nozzle If a solidified material slurry with a low pressure and a large flow rate, such as 4 MPa, is discharged, the ground can be cut mainly with the upper nozzle, and the solidified material can be supplemented and packed with the lower nozzle. Solidified piles can be created.

  In the case of a plurality of discharge nozzles, the type of fluid discharged from each discharge nozzle can be changed. For example, when using so-called upper, middle, and lower nozzles that are installed with three discharge nozzles spaced apart in the vertical direction, for example, when pulling out, high pressure water and compressed air are discharged from the upper nozzle, If a low-pressure solidified slurry is discharged from the nozzle, a solidified pile can be efficiently created. In this case, the middle nozzle and the lower nozzle correspond to the two discharge nozzles of the present invention.

  In the case of the upper and lower nozzles, for example, if water glass is discharged from the upper nozzle and cement milk is discharged from the lower nozzle, the construction speed can be increased and a high-quality solidified pile can be created, and cement and water can be formed. Since the gelation is caused by the mixing of the glass and the cement becomes difficult to be mixed into the discharged muddy water, the problem of clogging of the filter press caused by the mixing of the cement into the discharged muddy water can be solved.

  In the case of the upper and lower nozzles, the type of discharged fluid can be changed between penetration and withdrawal. For example, high pressure water and compressed air are discharged from the upper nozzle and the lower nozzle at the time of penetration, and solidified material slurry is discharged from the upper nozzle and the lower nozzle at the time of extraction. The construction speed can be increased and high-quality solidified piles can be created.

  The solidifying material is not particularly limited, and examples thereof include cement slurry, water glass, silica sol, and a mixture thereof. As the means for supplying these liquid solidifying materials, known means can be used. Moreover, powder can also be used as a solidification material. In this case, the powder is discharged together with the compressed air.

  The double stream line jet method of the present invention is not particularly limited as long as it can be discharged while forming a double stream number jet while raising the rotating shaft and stirring and mixing with the in situ soil. The rotation shaft penetration process stops the discharge of the solidified material from the discharge nozzle and allows water to be injected from the tip of the rotation shaft, making it easier to collect mud around the horizontal wing when creating the solidified pile, It is preferable in that a high-quality solidified pile can be created.

In the double stream line jet method of the present invention, the rotational speed and pulling speed of the rotary shaft are determined so that the pitch of the trajectory of the discharge nozzle becomes a constant value selected from the range of 2.0 to 5.0 cm. An example of a method for determining the number of rotations of the rotation shaft and the pulling speed and an installation position of the discharge nozzle will be described with reference to FIGS. FIG. 1A is a simplified view of a horizontal wing provided with two discharge nozzles attached to a rotating shaft as viewed from above, and FIG. 1B is a situation in which solidified material is discharged from the discharge nozzles when the rotating shaft is pulled up. FIG. 2 (B) is a schematic plan view of a horizontal blade that has two discharge nozzles in the same horizontal plane and rotates counterclockwise, and FIG. 2 (A) is attached to the tip of the horizontal blade. FIG. 3A is a schematic view of the trajectory of the discharge nozzle as viewed from the front, FIG. 3A is a simplified view of the horizontal wing provided with three discharge nozzles attached to the rotating shaft, and FIG. 3B is a rotation. FIG. 4B is a simplified diagram of a horizontal wing that has three discharge nozzles in the same horizontal plane and rotates counterclockwise. FIG. 4A is a schematic view of the trajectory of the discharge nozzle attached to the tip of the horizontal blade as seen from the front, and FIG. 5B is the same. FIG. 5A is a simplified plan view of a horizontal blade that has four discharge nozzles in a horizontal plane and rotates counterclockwise, and FIG. 5A is a schematic view of the trajectory of the discharge nozzle attached to the tip of the horizontal blade as viewed from the front. FIG. The rotation angle in the figure, the angle with respect to the counterclockwise direction the right end a ₁ as the starting point. 2 (A), 4 (A), and 5 (A), the front side 180 to 360 degrees is indicated by a solid line, and the back side 0 to 180 degrees is indicated by a broken line.

In FIG. 1, discharge nozzles 4a and 4b are attached to the tips of horizontal blades 11 and 12 extending on both sides around a rotation shaft 3, and the two discharge nozzles 4a and 4b are in the same horizontal plane, and the rotation direction At 180 degrees apart. In FIG. 1B, the thin arrow 2 is discharged from the tip 4 b of the horizontal blade 12, and the thick arrow 1 is discharged from the tip 4 a of the horizontal blade 11 . In FIG. 1, the pitch 2.5 cm of the trajectory of the discharge nozzles 4a and 4b is represented by the drawing speed (X) ÷ the number of rotations (Y) ÷ the number of discharge nozzles installed. For example, extraction speed 0.5 m / min , rotation speed 10 times / min (condition 1), extraction speed 0.4 m / min , rotation speed 8 times / min (condition 2) or extraction speed 0.8 m / min , rotation speed It is determined as 16 times / minute (condition 3). In addition, the diameter which can build a good-quality solidified pile under the conditions of the discharge flow rate of 80 liters / minute and the discharge pressure of 20 MPa under the conditions 1, 2 and 3 is 1.50 m, 1.58 m and 1.38 m, respectively. . Therefore, the above-mentioned condition 2 is selected when both sides are existing structures, and when performing the filling work in the gap 1.55 m of the existing structures. In addition, when the gap is 1.30 m, the condition 3 is selected. Conditions 1 and 2 are not preferable in that the solidified material is wasted. In addition, in order to satisfy both a required creation pile diameter and intensity | strength, the discharge flow volume and discharge pressure of a solidification material will be determined suitably previously.

For comparison with the above condition 1, a conventional one-line flow jet method will be described with reference to FIG. 6A is a simplified view of the horizontal blade 11 provided with a single discharge nozzle 4a attached to the rotating shaft, as viewed from above, and FIG. 6B is a diagram illustrating how solidified material is discharged from the discharge nozzle 4a when the rotating shaft 3 is pulled up. It is a figure explaining the situation to do. FIG. 6 shows a discharge nozzle 4 a attached to the tip of the horizontal blade 11 among the horizontal blades 11 and 12 extending to both sides around the rotating shaft 3. In FIG. 6, the pitch (2.5 cm) of the trajectory of the discharge nozzle 4a is represented by the drawing speed (X) ÷ the number of rotations (Y) ÷ the number of the setting of the discharge nozzles. For example, the drawing speed is 0.25 m / min . Several tens of times / minute (condition 4). In the case of the condition 1 of the present invention, in contrast to the condition 4, a solidified pile having the same quality can be formed at about twice the speed.

In the form of FIG. 1, the discharge nozzle is not necessarily installed in the same horizontal plane, and can be installed at a specific position in the vertical direction. 2, in the two discharge nozzles 4a and 4b in the same horizontal plane, the discharge nozzle 4a is pulled up with _a 2, _{a 3} and _{a 4} for each rotation of the rotating shaft. In this case, the pitches a ₁ to a ₂ , a ₂ to a _3, and a ₃ to a ₄ of the trajectory of the discharge nozzle are 5 cm. Similarly, the discharge nozzle 4b is raised and _b 2, _{b 3} and _{b 4} for each rotation of the rotating shaft. With discharge nozzles 4b is a 5cm of _{b 4} from _{b 3} and _{b 3} pitch trajectory from _{b 1} from _{b 2, b} 2, will be located in the middle of the trajectory of the preceding discharge nozzle 4a. To make the pitch of the trajectory formed by the two discharge nozzles 4a and 4b, that is, the spray density 2.5 cm, the two discharge nozzles are a ₁ → a ₁₂ → a ₂ → a, respectively. ₂₃ → a ₃ → a ₃₄ → a ₄ ... And b ₁ → b ₁₂ → b ₂ → b ₂₃ → b ₃ → b ₃₄ → b ₄ . Thus, for example, in the discharge nozzle 4b is 2, as shown by a triangle mark, 5 cm in a vertical direction from the position _{a 1} of _the ejection nozzle 4a, 10 cm, so that the may be attached to 15cm · · · upward.

In FIG. 2B, a single letter horizontal wing is shown, but the wing of the discharge nozzle 4b may be an L-shaped horizontal wing bent 90 degrees from the center, and the discharge nozzle may be attached to the tip. In this case, the discharge nozzle (not shown) attached to the bent horizontal wing moves in the order of square marks c ₁ to b ₂ → b ₂₃ → b ₃ → b ₃₄ → b ₄ ... In FIG. Will do.

FIG. 3 shows discharge nozzles 4a, 4b, and 4c attached to the tips of horizontal blades 11, 12, and 13 that extend on both sides around the rotation shaft 3, and the three discharge nozzles 4a, 4b, and 4c are on the same horizontal plane. And 120 degrees apart in the rotational direction. In FIG. 3B, a thin arrow 1 indicates a situation where the solidified material is discharged from the tip 4a of the horizontal blade 11, a thick arrow 2 indicates a state where the solidified material is discharged from the tip 4b of the horizontal blade 12, and a broken arrow 2a. Indicates a state in which the solidified material is discharged from the tip 4 c of the horizontal blade 13. In FIG. 3, the pitch (2.5 cm) of the trajectories of the discharge nozzles 4a, 4b, and 4c is expressed by the drawing speed (X) ÷ the number of rotations (Y) ÷ the number of installed discharge nozzles. The pulling speed is, for example, a drawing speed of 0.75 m / min and a rotation speed of 10 times / min (condition 5). According to this condition 5, as compared with condition 4 of the conventional single streamline construction method, a solidified pile having the same quality can be formed at a speed about three times higher.

In the form of FIG. 3, the discharge nozzle is not necessarily installed in the same horizontal plane, and can be installed at a specific position in the vertical direction. 4, three discharge nozzles 4a in the same horizontal plane, among 4b and 4c, the discharge nozzle 4a (reference discharge nozzle) is raised with _{a 2} and _{a 3} for each rotation of the rotating shaft. In this case, the pitches a ₁ to a ₂ and a ₂ to a ₃ of the trajectory of the discharge nozzle are 7.5 cm. Similarly, the pitch of the discharge nozzles 4b trajectory is 7.5cm for _{b 23} from _{b 12,} with respect to the trajectory of the preceding ejection nozzle 4a, it is in a position delayed pitch 2.5 cm, discharge nozzles 4c trajectory with pitch is 7.5cm of _{c 23} from _{c 12,} the relative trajectory of the preceding ejection nozzle 4b, comes to a position delayed pitch 2.5 cm. In order to make the pitch of the trajectory formed by the three discharge nozzles 4a, 4b and 4c, that is, the injection density 2.5 cm, the three discharge nozzles are a ₁ → a ₁₂ → a ₂ → a, respectively. ₂₃ → a ₃ ..., B ₁ → b ₁₂ → b ₂ → b ₂₃ → b ₃ ... And c ₁ → c ₁₂ → c ₂ → c ₂₃ → c _3. The

FIG. 5 shows the discharge nozzles 4a, 4b, 4c, and 4d attached to the tips of horizontal blades 11, 12, 13, and 14 that extend in four directions around the rotation axis. 4d are in the same horizontal plane and are 90 degrees apart from each other in the rotational direction. In this case, _{a 2} from the pitch _{a 1} locus of discharge nozzles is 10 cm. In FIG. 5, the pitch (2.5 cm) of the trajectories of the discharge nozzles 4a, 4b, 4c, and 4d is expressed by the drawing speed (X) ÷ the number of rotations (Y) ÷ the number of discharge nozzles installed. The number and the pulling speed are, for example, a pulling speed of 1.00 m / min and a rotating speed of 10 times / min (condition 6). According to this condition 6, as compared with condition 4 of the conventional single streamline construction method, a solidified pile with the same quality can be formed at a speed about 4 times faster.

In the form of FIG. 5, the discharge nozzle does not necessarily have to be installed in the same horizontal plane, and can be installed at a specific position in the vertical direction. In FIG. 5, among the four discharge nozzles 4a, 4b, 4c and 4d in the same horizontal plane, the discharge nozzle 4a (reference discharge nozzle) is pulled up to a ₁ and a ₂ every rotation of the rotation shaft. In this case, _{a 2} from the pitch _{a 1} locus of discharge nozzles is 10 cm. Similarly, the ejection nozzle 4b pitch trajectory is 10cm of _{b 23} from _{b 12,} with respect to the trajectory of the preceding ejection nozzle 4a, is in a position delayed pitch 2.5 cm, discharge nozzles 4c pitch trajectory Is 10 cm from c ₁₂ to c ₂₃ and at a position delayed by 2.5 cm from the locus of the preceding discharge nozzle 4 b, and the discharge nozzle 4 d has a locus pitch of 10 cm from d ₁₂ to d _23. At the same time, the pitch is 2.5 cm behind the locus of the preceding discharge nozzle 4c. In order to make the pitch of the trajectory formed by the three discharge nozzles 4a, 4b, 4c and 4d, that is, the injection density 2.5 cm, the four discharge nozzles are each a ₁ → a ₁₂ → a _2. .., B ₁ → b ₁₂ → b ₂ → b ₂₃ ... And c ₁ → c ₁₂ → c ₂ → c ₂₃ .

In the present invention, the installation position of the discharge nozzle is as exemplified above, but can also be obtained from the following equation (1). That is, the installation position in the vertical direction of two or more solidifying material discharge nozzles is expressed by the following formula (1) from the reference solidifying material discharge nozzle:
P × A + (θ × n × P) / 360 ± n × P × m (1)
(In the formula, P indicates the pitch of the trajectory of the solidifying material discharge nozzle, A is a case (installation form) number, which is a number from 1 to n−1 and is an arbitrary number that does not overlap for each discharge port, and θ is The angle in the rotation direction from the reference solidifying material discharge nozzle, which indicates the mounting position of the discharge nozzle, n indicates the number of discharge nozzles, and m indicates the number of pitches of the discharge nozzle trajectory, which is 0 or an arbitrary integer .) Are separated by the value calculated in (cm).

For example, in the case of two discharge nozzles separated by 180 degrees in the rotation direction, it is 5.0 ± 5.0 cm , and if m = 0, 1, it becomes 0, 5.0 or 10.0 cm, and the reference discharge What is necessary is just to install apart in the vertical direction by this dimension with respect to the nozzle. Further, in the case of three discharge nozzles separated by 120 degrees in the rotation direction, for example, A = 1, θ = 120 degrees is 5.0 ± 7.5 cm , and A = 2, θ = 240 degrees is 10 ± 7. .5 cm . In this case, with respect to the discharge nozzle of θ = 0, if the discharge nozzle at the position of θ = 120 degrees is m = 0, 1, it is −2.5, 5.0, 12.5 cm, and θ = The discharge nozzles at a position of 240 degrees are 2.5, 10.0, and 17.5 cm. Therefore, it suffices to install this dimension apart from the discharge nozzle of θ = 0 in the vertical direction. Also, A = 2, a theta = 120 degrees 7.5 + 7.5 cm, A = 1 , a theta = 240 degrees 7.5 + 7.5 cm. In this case, if m = 0 and 1, with respect to the discharge nozzle of θ = 0, the discharge nozzle at the position of θ = 120 degrees is set apart in the vertical direction of 0, 7.5, 15.0 cm, Similarly, the discharge nozzles at the position of θ = 240 degrees may be set apart by 0, 7.5, 15.0 cm with respect to the vertical direction.

  The formation method of the solidification processing pile of this invention can be applied to the adhesion | attachment construction which makes a solidification processing pile closely_contact | adhere to an existing structure. In the case of the close contact construction, it is necessary to make the solidified pile to be in close contact with the existing structure.For example, it is necessary to select a design treated pile diameter larger than the interim dimensions, but in the case of the creation method of the present invention, A proper discharge flow rate and pressure are set, and the number of rotations of the rotating shaft and the pulling-up speed are selected as appropriate so as to satisfy the design solidification processing pile diameter and the solidification material blending ratio. In addition, in the case of stuffing, the conventional one-line construction method has a reaction force on one existing wall, and the shaft may tilt in the opposite direction. In the worst case, the existing wall contacts the existing wall on the opposite side to the injection direction. However, in the case of the double stream line of the present invention, particularly the double stream line method, the axial runout is small because of the opposing injection. In addition, since the solidified material is discharged from each horizontal blade, the reaction force increases when the discharge nozzle approaches the existing wall, and the horizontal blade does not come into contact with the existing wall because the reaction force increases.

(A) is a simplified view of a horizontal wing provided with two discharge nozzles attached to a rotary shaft, as viewed from above, and (B) is a diagram for explaining a state in which a solidified material is discharged from the discharge nozzle accompanying the lifting of the rotary shaft. It is. (B) is a schematic plan view of a horizontal blade that has two discharge nozzles in the same horizontal plane and rotates counterclockwise, and (A) shows the trajectory of the discharge nozzle attached to the tip of the horizontal blade from the front. It is the seen schematic diagram. (A) is a simplified view of a horizontal wing provided with three discharge nozzles attached to a rotating shaft as viewed from above, and (B) is a diagram for explaining a situation in which a solidified material is discharged from the discharge nozzle when the rotating shaft is lifted. It is. (B) is a simplified diagram of a horizontal blade that has three discharge nozzles in the same horizontal plane and rotates counterclockwise, and (A) shows the trajectory of the discharge nozzle attached to the tip of the horizontal blade from the front. It is a schematic diagram. (B) is a simplified plan view of a horizontal blade that has four discharge nozzles in the same horizontal plane and rotates counterclockwise, and (A) shows the trajectory of the discharge nozzle attached to the tip of the horizontal blade from the front. It is the seen schematic diagram. In the conventional construction method, (A) is a simplified view of a horizontal wing provided with one discharge nozzle attached to a rotating shaft, and (B) is a discharge state of solidified material from the discharge nozzle when the rotating shaft is pulled up. FIG. It is a figure which shows the rotating shaft structure which has a discharge nozzle in the conventional horizontal blade.

Explanation of symbols

1, 2, 2a Discharge jet 3, 16 Rotating shaft 4a-4d, 131, 141 Discharge nozzle 11-14, 12a, 12b Horizontal blade

Claims (4)

The rotation shaft penetration process was performed at a predetermined position of the rotation shaft when stopping the discharge of the solidified material of the discharge nozzle, penetrating while discharging water from the tip of the rotation shaft, and pulling up while rotating the rotation shaft. A method of discharging a solidified material from three or four solidified material discharge nozzles in a horizontal direction while forming a double-flow number jet and stirring and mixing with an in-situ soil to form a solidified pile. A double streamline jet characterized in that the rotational speed of the rotating shaft and the pulling speed are determined so that the pitch of the trajectory formed by the discharge nozzle becomes a constant value P selected from a range of 2.0 to 5.0 cm. Of solidifying piles by means of The rotation shaft penetration process stops the discharge of the solidified material from the discharge nozzle, penetrates while spraying water from the tip of the rotation shaft, and is attached at different positions in the vertical direction of the rotation shaft when pulling up while rotating the rotation shaft. The solidified material is discharged from the two solidified material discharge nozzles in a horizontal direction while forming a double-flow number jet, and is agitated and mixed with the in-situ soil to form a solidified pile. By using a double stream jet characterized in that the rotational speed of the rotating shaft and the pulling speed are determined so that the pitch of the locus formed by the nozzle becomes a constant value P selected from the range of 2.0 to 5.0 cm. How to create a solidified pile. 3. The solidification by a double stream jet according to claim 2, wherein the solidifying material discharge nozzles are two that are spaced apart by 2P in the vertical direction and are 180 degrees apart in the rotation direction. How to create a processing pile. Construction method of solidification piles of claim 1 to 3 double-flow line jet, wherein the is a solidification pile a contact construction for Construction in close contact to the existing structures.

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