JP6183742B2 - Improved body construction method - Google Patents

Description

The present invention is a ground improvement construction method used for the purpose of soft ground stability, ground support, tunnel support, structure foundation, structure foundation reinforcement, liquefaction prevention, underground wall for water shielding, groundwater spring prevention, etc. Among them, the present invention relates to an improved body forming method in which a hardened material liquid is injected from a nozzle at high pressure to form an improved body.

As conventional techniques for the improved body construction method in which the rod is pulled out from the nozzle at the tip of the rod at a high pressure and the rod is pulled out by a predetermined length to create an improved body on the ground, there are a JSG method and a super jet method. Each method repeats the process of rotating the rod a predetermined number of times at a constant speed while ejecting the curing material liquid from one nozzle, and the process of pulling up the step width rod of several centimeters to 10 centimeters to form a cylindrical shape having a predetermined length. An improved body has been created. In recent years, a method of creating a semicircular improved body or a fan-shaped improved body by swinging a predetermined angle without rotating the rod is also used.

JP 2001-295260 A JP-A-8-302663

Issued by the General Public Works Research Institute, “Foundation Works May 2009”

  In the prior art as described above, a rotating and swinging process in which a rod is inserted at a predetermined depth and the rod is rotated or swung a predetermined number of times at a constant speed while ejecting a curing material liquid from a nozzle attached to the tip of the rod, It has a pulling-up process of pulling up a step width rod of 10 cm to 10 cm, and after repeating these two processes for a length of improved length, the rod is pulled out to the ground to form a cylindrical shape or a fan-shaped shape with a predetermined angle. Since all the conventional methods are intended to increase the diameter, they have been developed with the primary purpose of flying the jet of the curing agent solution far away. On the other hand, when the wall-like improved body is formed by a conventional construction method, it can only be formed with a wall thickness of less than 10 cm, so that it is rarely used in civil engineering work.

  However, if there is a construction method that can easily and inexpensively build a wall-like improved body with a wall thickness of 20 cm or more by simply pulling up and inserting the rod, there is no major problem in Japan today. Hexagonal (honeycomb) lattice shape, quadrangular lattice shape (including parallelogram) and triangular lattice-shaped wall improvement body improvement area which is considered to be very effective for liquefaction countermeasures, etc. can be freely and inexpensively formed can do.

Therefore, the present invention hardens the peripheral surface of the rod in order to create a wall-like improved body having a predetermined wall thickness by injecting a hardener liquid at a high pressure from a nozzle at the tip of the rod inserted into the ground. An injection nozzle a, an injection nozzle b, and an injection nozzle c for injecting a liquid jet jet at a high pressure in a predetermined radial direction are arranged so as to have a predetermined vertical distance and horizontal distance from each other, and the injection nozzle a and the injection nozzle b And the injection nozzle c include a hardener liquid jet jet a injected from the injection nozzle a, a hardener liquid jet jet b injected from the injection nozzle b, and a hardener liquid jet jet c injected from the injection nozzle c. To reach the underground target area set at a predetermined distance in the radial direction, and reach and pass in a horizontal arrangement, an oblique arrangement, a V-shaped arrangement, or an inverted V-shaped arrangement while having a predetermined distance from each other. Sea urchin are respectively arranged at an angle, without inserting the rod into a predetermined depth of a given soil, rotated or swung while spraying at high pressure sclerosant liquid from the injection nozzle a and the injection nozzle b and the injection nozzle c By inserting or pulling up at a predetermined speed, a wall-like improved body having a substantially fan-like cross-sectional shape in plan view is formed.

According to this, in a plan view having a predetermined wall thickness in a predetermined radial direction from the rod by injecting the hardener liquid at a high pressure while inserting or pulling the rod without rotating or swinging the rod. It is possible to easily produce a wall-shaped improved body having a substantially fan-shaped cross-section, and the wall-shaped improved body has a constant degree of curing agent liquid kneading and a uniform strength during curing. The side surface and upper and lower formation surfaces are prepared and the shape is stabilized.

Furthermore, the present invention is characterized in that a wall-shaped improved body having a substantially fan-like cross-sectional shape in plan view is simultaneously formed in three directions .

According to this, the wall-shaped improved body whose cross-sectional shape in planar view is substantially fan-shaped can be easily simultaneously formed in three directions.

In addition, the present invention is a hexagonal lattice shape, a parallelogram lattice shape, or a triangular lattice shape by forming a predetermined number of wall-shaped improved bodies having a substantially fan-like cross-sectional shape in plan view at a predetermined depth at a predetermined point. It is characterized by forming a wall-like improvement body improvement zone.

According to this, a wall-like improved body improvement region having a predetermined wall thickness in a hexagonal (honeycomb) lattice shape, a parallelogram lattice shape, or a triangular lattice shape, which is considered to be very effective for countermeasures against liquefaction, etc. can be obtained in a short time. It can be formed at low cost.

When the present invention is used, for example, the wall thickness of the wall-like improvement body in the underground target area at a predetermined distance such as a point 2 m away from the rod in the radial direction or a point 2.5 m away is 20 cm, 30 cm, 40 cm or 50 cm. It can be reliably and easily created with a predetermined wall thickness.

Furthermore, according to the present invention, a wall-like improved body having a wall thickness exceeding 1 m as well as 60 cm can be easily formed by arranging adjacent wall-shaped improved bodies adjacent to each other. You can also

In the present invention, the numerical value changes depending on the injection pressure of the hardener liquid jet (currently approximately 20 to 60 MP is assumed), but the distance from the rod to the underground target area that is a predetermined distance in the radial direction is 0.5 m. Can be set freely within a range of about 5 m from 5 m, and the distance between the hardener liquid jets and the number of hardener liquid jets in the underground target area can be freely set, so that the wall has a size suitable for the application. A shape improvement body can be formed easily.

Furthermore, the wall-like improvement body created by the present invention, the hexagonal (honeycomb) lattice shape, the parallelogram lattice shape, and the triangular lattice-like wall shape improvement body area are not only the size and the arrangement, but also the wall thickness and the arrangement. The interval can be set freely, and the number of nozzles constituting the predetermined distance aiming composite nozzle arranged on the rod, the diameter, and the arrangement thereof can also be set freely. The present invention can not only respond to a wide range of applications by ground improvement such as water stoppage, countermeasures against liquefaction, and temporary retaining walls, but it can also be expected to have the effect of reducing materials, reducing construction costs and shortening the construction period while reducing the burden on the environment. In combination with other types of flat plate improvements, fan-like improvements, etc., it can be used to form improved areas with more complex structures, and has the potential to be used for unprecedented applications in the future.

In the Example of this invention, it is a front view of the rod which installed the predetermined distance aiming compound nozzle in one place. In the Example of this invention, it is a front view of the state which inserted the rod in the predetermined depth of the target ground with the construction machine. In the Example of this invention, it is a side view which shows the state which injected the hardening | curing agent liquid jet jet from the predetermined distance aiming composite nozzle. In the Example of this invention, it is a perspective view which shows the state which injected the hardening | curing agent liquid jet jet from the predetermined distance aiming composite nozzle. It is a figure which shows the wall-shaped improvement body created in the Example of this invention. In the Example of this invention, it is sectional drawing of the rod which installed the predetermined distance aiming composite nozzle in three places. In the Example of this invention, it is a figure which shows the wall-shaped improvement body created in the Example of this invention. In the Example of this invention, it is a figure which shows the wall-shaped improvement area | region formed in the Example of this invention. In the Example of this invention, it is a figure which shows the wall-shaped improvement area | region formed in the Example of this invention. In the Example of this invention, it is a figure which shows the wall-shaped improvement area | region formed in the Example of this invention.

  The rod 1 used in the present invention has a predetermined distance aiming composite nozzle 3 composed of three or more injection nozzles 2 on the side surface of the tip. The number of nozzles constituting one injection nozzle 2 may be one or a plurality of nozzles having a small diameter. Further, the mutual arrangement of the injection nozzles 2 constituting the predetermined distance aiming composite nozzle 3 may be any of a V-shaped arrangement, an oblique arrangement, and a horizontal arrangement random arrangement, but a plurality of curing agent liquids injected from the predetermined distance aiming composite nozzle 3. The jet jet 4 is located at a substantially equal distance (for example, about a distance from the jet jet 4 of the hardener liquid adjacent to each other in an underground target area 5 that is separated from the rod 1 by a predetermined distance in the radial direction (for example, 2 m in the radial direction from the rod). Each injection nozzle 2 is arranged by adjusting the arrangement position, direction, angle and nozzle diameter so as to pass through the ground at 15 cm). It is also possible to arrange a plurality of predetermined distance aiming composite nozzles 3 in different directions at the tip of the rod 1 and simultaneously create a plurality of wall-shaped improvement bodies 31.

Further, the cross-sectional shape of the rod 1 may be any of a circular shape, a quadrangular shape, a hexagonal shape, etc., and each has a necessary number of passages for a hardening material liquid, compressed air, and water. Any structure of a perforated tube may be used. In addition, a mud discharge passage and a communication passage may be appropriately provided inside. On the surface of the rod 1, a vertical mark for direction confirmation management and a horizontal mark for insertion or pulling distance management may be written in a line shape or a dot shape by forming a recess, or a line shape or a dot shape by a paint or a seal. An example of the rod 1 having one predetermined distance aiming composite nozzle 3 is shown in FIG. The rod 1 in FIG. 1 is a quadrangle with a side of 14 cm, and has an injection nozzle 2a, an injection nozzle 2b, and an injection nozzle 2c at the tip. The nozzle diameter is the same and the inner diameter is 4 mm. 2a and the injection nozzle 2b are arranged 10 cm apart in the vertical position, 5 cm in the horizontal position, and 11.2 cm apart in the oblique position. The injection nozzle 2b and the injection nozzle 2c are also 10 cm in the vertical position, 5 cm in the horizontal position, and 11. 8 cm apart. Further, the injection directions of the injection nozzle 2a, the injection nozzle 2b, and the injection nozzle 2c are 2.86 ° and 2.86 ° in the downward direction, opposite to the clockwise direction (leftward) of the injection nozzle 2a. The nozzle 2b is adjusted straightly in the radial direction, and the injection nozzle 2c is adjusted 2.86 ° clockwise (to the right) and 2.86 ° upward in the radial direction. Thereby, the aiming distance of the predetermined distance aiming composite nozzle 3 is set to 2.0 m. Here, the predetermined distance aiming composite nozzle 3 is constituted by the three injection nozzles of the injection nozzle 2a, the injection nozzle 2b, and the injection nozzle 2c, but may be constituted by four or more injection nozzles 2, and each of the injection nozzles. The apertures of 2 may be the same or different from each other.

The construction machine 11 used in the present invention changes the direction of the rod 1 with an insertion pulling means that holds a predetermined position of the rod 1 and inserts or pulls the rod 1 at a predetermined speed at a predetermined insertion speed and a predetermined pulling speed. And a rotation device that can manage the device in real time and connect a management device that can be executed in accordance with the program. An example of the state in which the rod 1 of FIG. 1 is inserted at a predetermined depth of the target ground 21 by the construction machine 11 is shown in FIG. A swivel is connected to the top of the rod 1 on the ground side, and a hardening material liquid, compressed air, water, and the like are sent from the swivel to the inside of the rod 1 through a dedicated hose.

The side view of the state in which the hardener liquid jet 4a, the hardener liquid jet 4b, and the hardener liquid jet 4c are ejected from the predetermined distance aiming composite nozzle 3 using the rod 1 of FIG. 1 is the same as FIG. A perspective view of this is shown in FIG. At this time, the hardener liquid jet 4a, the hardener liquid jet 4b, and the hardener liquid jet 4c are arranged such that three hardener liquid jets are horizontally arranged in the underground target area 5 which is 2.0 m away from the rod in the radial direction. It passes through the ground at an interval of 15 cm with the adjacent hardener liquid jet. Here, the numerical value when the spraying pressure of the curing agent liquid is 40 Mp is used, but the spraying pressure of the curing agent liquid can be arbitrarily set, and usually about 20 to 60 Mp is used. In FIG. 3, the aiming distance of the predetermined distance aiming composite nozzle 3 is 2.0 m, and the interval between adjacent hardener liquid jets is 15 cm. However, these numerical values can also be arbitrarily set, and usually the predetermined distance aiming composite nozzle The aiming distance of 3 is 1.0 m to 4.5 m, and the interval between adjacent hardener liquid jets is about 8 cm to 25 cm. Further, in this embodiment, the hardener liquid jet 4a, the hardener liquid jet 4b, and the hardener liquid jet 4c are positioned horizontally at equal intervals with the adjacent hardener liquid jet in the underground target region 5. However, it may be set by an oblique arrangement of a predetermined angle, a V-shaped arrangement, or an inverted V-shaped arrangement.

In FIG. 5, the hardener liquid jet 4 is ejected from the composite nozzle 3 for a predetermined distance while the rod 1 of FIGS. 1, 3, and 4 is pulled up to a predetermined depth in the ground at a predetermined speed (for example, 5 cm per second) to a predetermined length. An example in which the wall-shaped improved body 31 is constructed is shown. The wall-like improved body 31 in FIG. 5 has a wall width of about 45 cm at a point 2.0 m in the radial direction from the rod, the entire area has been improved from the rod to 2.0 m in the radial direction, and 2.0 m in the radial direction from the rod. In the distance, there is a part of the unmodified area, and the wall width around the rod 1 is approximately 20 cm. The wall width at a predetermined distance can be roughly calculated by the equation: number of jet jets × interval at a predetermined distance of jet amount + jet width at a predetermined distance of each jet jet × 1/2, and the required width at a predetermined distance. Depending on the wall width, the injection pressure of the curing agent liquid, the nozzle diameter to be used, the number of jet jets, and the like can be determined. Here, an example in which the wall-like improvement body 31 is created while pulling up the rod 1 is shown, but the wall-like improvement body 31 may be created while the rod 1 is inserted. The wall thickness around the rod 1 is larger than the rod diameter (14 cm) when the rod 1 is inserted or pulled up, a gap is created between the rod 1 and the surrounding ground, and there is a hardener liquid or waste mud. This is because it enters and solidifies.

FIG. 6 shows a rod 1 having three predetermined distance aiming composite nozzles 3. Each of the predetermined distance aiming composite nozzle 3A, the predetermined distance aiming composite nozzle 3B, and the predetermined distance aiming composite nozzle 3C is composed of the injection nozzle 2a, the injection nozzle 2b, and the injection nozzle 2c as in FIG. ° Arrangement and at different heights of the rod 1. The reason why the nozzles are arranged at different heights is that the horizontal distance behind each of the injection nozzles 2 (curing agent liquid running distance before nozzle injection) is sufficiently taken. 6, illustration of the internal structure of the rod 1 is omitted, and only the injection nozzle 2a to the injection nozzle 2c, the predetermined distance aiming composite nozzle 3A to the predetermined distance aiming composite nozzle 3C, and the center point are shown.

FIG. 7 shows an example in which a wall-shaped improved body 31 having a predetermined length is formed using the rod 1 of FIG. The wall-shaped improved body 31 formed by the predetermined distance aiming composite nozzle 3A, the predetermined distance aiming composite nozzle 3B, and the predetermined distance aiming composite nozzle 3C has a wall width of 45 cm in the underground target area 5 of 2.0 m in the radial direction from the rod. The entire area is improved from the rod 1 to the radial direction of 2.0 m, and a part of the rod 1 is not improved at a distance of 2.0 m or more from the radial direction.

  FIG. 8 shows a case where three wall-like improved bodies 31 similar to those in FIG. 7 are joined to form a triangular arrangement with a side of 3.46 m on the plane where the rod 1 is inserted. Since the wall-shaped improvement body 31 is formed by simultaneously forming walls in three directions, a hexagonal (honeycomb) lattice-shaped improvement area 41 can be easily formed by joining and forming three wall-shaped improvement bodies 31 at a predetermined interval. .

Further, FIG. 9 shows an example in which one wall-like improved body 31 similar to that in FIG. 7 is formed in a predetermined direction inside the hexagonal (honeycomb) lattice-like improved region 41 in FIG. In this way, the parallelogram lattice improvement region 42 can be easily created.

As shown in FIG. 9, the thickest part (approximately 45 cm in this example) or the thickest part of another wall-like improved body 31 is placed at the thinnest wall thickness part (approximately 20 cm in this example). By taking an arrangement in which the vicinity of the thick portion is connected, the strength of the parallelogram-shaped lattice improvement region 42 to be formed can be improved.

Further, in FIG. 10, a triangular lattice-shaped improvement region 43 is formed in the parallelogram lattice-shaped improvement region 42 of FIG. An example was given. In the present embodiment, the underground target area 5 of the wall-like improved body 31 that simultaneously forms walls in three directions is set to 2.0 m in the radial direction from the rod, the wall thickness is set to approximately 20 cm at the thinnest part, and approximately 45 cm at the thickest part. However, the number of directions to be created simultaneously (number of walls), the distance from the rod of the underground target area 5 and the wall thickness can be set according to the purpose and on-site conditions.

Further, in FIG. 10, the wall-like improved body 31 is formed at the same insertion position as the rod 1 in FIG. 9, but the triangular lattice-like improvement can be efficiently performed in a short time when there is a risk of hardening or collapse of the insertion position of the rod 1. As a method for creating the region 43, the wall-like improved body 31 shown in FIG. 9 is formed while the rod 1 is inserted, and the wall-like improved body 31 shown in FIG. May be.

In the embodiment of the present invention, the case of injecting the curing agent liquid has been described. However, a curing agent liquid mixed with a soil conditioner, aggregate, or special fiber, or an asphalt liquid may be used.

  Moreover, you may form a grid | lattice improvement area | region in arbitrary directions, such as a horizontal direction or a diagonal direction other than a perpendicular direction, by inserting a rod with respect to the ground in the desired direction.

As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  INDUSTRIAL APPLICATION This invention is utilized in the industry relevant to the improved body formation method and improved body formation apparatus in the ground.

DESCRIPTION OF SYMBOLS 1 ... Rod, 2 ... Injection nozzle, 3 ... Predetermined distance aiming composite nozzle, 4 ... Hardener liquid jet jet, 5 ... Underground target area, 11 ... Construction machine, 21 ... Target ground, 31 ... Wall improvement body, 41 ... hexagonal (honeycomb) lattice improvement region, 42 ... parallelogram lattice improvement region, 43 ... triangular lattice improvement region

Claims (3)

In order to create a wall-like improvement body having a predetermined wall thickness by spraying a curing agent liquid at a high pressure from a nozzle at the tip of the rod inserted into the ground,
An injection nozzle a, an injection nozzle b, and an injection nozzle c for injecting a hardener liquid jet in a predetermined radial direction at a high pressure on the tip peripheral surface of the rod are arranged so as to have a predetermined vertical distance and horizontal distance from each other;
The injection nozzle a, the injection nozzle b, and the injection nozzle c are cured from the curing agent liquid jet jet a ejected from the ejection nozzle a, the curing agent liquid jet jet b ejected from the ejection nozzle b, and the ejection nozzle c. The liquid jet jet c is arranged horizontally, obliquely, in a V shape or in an inverted V shape while having a predetermined distance from each other in the underground target area set at a predetermined distance in the radial direction from the rod. It is arranged at a predetermined angle to reach and pass,
Insert the rod in a predetermined depth of a given soil, a curing agent solution from the injection nozzle a and the injection nozzle b and the injection nozzle c Te inserted or pulled up at a predetermined speed without rotating or swinging while spraying at high pressure, in plan view An improved body construction method comprising creating a wall-like improved body having a substantially fan-like cross-sectional shape . 2. The improved body forming method according to claim 1, wherein the wall-shaped improved body having a substantially fan-like cross-sectional shape in plan view is simultaneously formed in three directions . Improving a wall-shaped improvement body having a hexagonal lattice shape, a parallelogram lattice shape, or a triangular lattice shape by forming a predetermined number of wall-shaped improvement bodies having a substantially fan-like cross-sectional shape in plan view at a predetermined depth at a predetermined point. The improved body creation method according to claim 1 , wherein a zone is formed.