JP2016145457A - Device for constructing hydraulic solidification material liquid substitution column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable avoidance of discharge of an elastic return part of a borehole wall surface onto ground after the elastic return part is scraped off by an excavation rod when the excavation rod is pulled up from the borehole.SOLUTION: A large-diameter excavation rod 1a for excavating ground for formation of a substitution column, and a small-diameter connection rod 1b serving as a grip part of an auger motor for rotating the excavation rod 1a are provided. A connection part 1c between the excavation rod 1a and the connection rod 1b is formed in a cone shape.SELECTED DRAWING: Figure 1

Description

The present invention relates to a hydraulic solidifying material liquid replacement column building apparatus used in a basic construction method for a relatively small structure such as a small-scale building such as a detached house or a soil slab.

  As a basic construction method for detached houses and soil slabs, a columnar improvement method (hereinafter referred to as a “column method”) by a deep mixed processing method is widely adopted. However, in the column method, in situ soil and cement slurry are stirred and mixed, so when cohesive soil with high adhesive strength is targeted, a co-rotation phenomenon occurs, resulting in poor quality due to poor mixing or organic soil. Depending on the type of ground such as, there was a problem that solidification failure occurred. In addition, unexpected soil quality that could not be found in prior ground surveys may appear, and there is always a risk of poor quality.

  As a prior art for solving this problem, a construction method of a hydraulic solidifying material liquid replacement column and a construction apparatus (see Patent Document 1) of a hydraulic solidifying material liquid replacement column have been proposed. In the first place, the cause of poor quality such as poor mixing and solidification of soil cement that is built by stirring and mixing the ground soil and hydraulic solidification liquid is the mixing and mixing of the hydraulic solidification liquid and the original ground soil. In view of the above, the prior art is to build a columnar body only with the hydraulic solidifying material liquid without stirring and mixing the ground soil and the hydraulic solidifying material liquid. Therefore, the built-in hydraulic solidification material liquid replacement column is high strength and high quality because the surrounding in situ soil is not mixed, and even if the surrounding in situ soil is organic soil, solidification failure does not occur, High strength and high quality can be demonstrated without being affected by soil quality.

  Further, as an improved technique related to the technique of Patent Document 1, a drilling head and a drilling apparatus (see Patent Document 2) for a drill rod for building a hydraulic solidifying material liquid replacement column have been proposed. This technique can greatly improve the excavation performance by using a conical excavation head (conical head) provided with spiral wings on the side surface. In addition, although a single-claw cone head inevitably generates a lump of dirt adhering to the claw part during rotary excavation, the cone head can dramatically reduce the amount of earth and sand adhering to this, and further lifting the drill rod There is an advantage that earth and sand adhering to the conical head sometimes can be prevented from falling.

  The construction by the excavation head and the excavator of Patent Document 2 is an excavation head (conical head) having a spiral excavation blade 13 and a hydraulic solidifying material liquid discharge port 14 on the peripheral surface as shown in FIG. A hydraulic solidification material liquid replacement column in which a small-diameter connecting rod 11b serving as a gripping portion of an auger motor that rotates the excavating rod 11a is connected above a large-diameter excavating rod 11a having a soil removal mechanism 12 connected to the lower end. The building device 11 is used.

  And this hydraulic solidification material liquid substitution column building apparatus 11 is mounted | worn to a construction machine (not shown), and as shown in FIG. 12, (a) the front-end | tip center part of the cone head 12 is set to a pile center position. . (B) The digging is performed while the excavating rod 11a is rotated forward. At this time, it is not essential to discharge the hydraulic solidifying material liquid from the discharge port 14 in the conical head 12. (C) When the predetermined excavation depth is shallower than the length of the excavation rod 11a, the excavation is stopped in a state where a part above the excavation rod 11a is on the ground. (D) When the predetermined excavation depth is deeper than the length of the excavation rod 11a, the excavation is performed until a part of the connecting rod 11b penetrates into the ground, and stops at the predetermined depth position. When the predetermined depth is deeper, the connecting rod 11b may be added. (E), (f) Thereafter, the excavating rod 11a is pulled up in a normal rotation state while discharging the hydraulic solidification material liquid 15 from the discharge port 14 in the conical head 12. At this time, the pulling speed of the excavating rod 11a and the discharge amount of the hydraulic solidifying material liquid 15 are adjusted so that no negative pressure is generated due to the pulling of the excavating rod 11a. At this time, the adhering earth and sand of the excavation head 12 is supported by the excavating blades 13 in a slight amount. Therefore, in order to prevent the adhering earth and sand of the excavation head 12 from falling, it is better to rotate the excavating rod 11a forward. preferable. (G) The excavating rod 11a is pulled up to the ground, the amount of the hydraulic solidifying material liquid 15 is adjusted, and the hydraulic solidifying material liquid 15 is filled to a predetermined top end position.

  By the way, in the hydraulic solidification material liquid replacement column construction apparatus 11, as shown in FIG. 11, the large diameter excavation rod 11a excavating the area | region which forms the hydraulic solidification material liquid replacement column of ground, and this excavation rod 11a are rotated. A connecting rod 11b having a small diameter that is a gripping portion of the auger motor is connected. Since the hydraulic solidifying liquid replacement column is assumed to be used as the foundation of light structures such as detached houses and soil slabs, the construction machine itself is usually a small columnar improvement machine or pile driving machine. Is used. Therefore, the maximum length of the excavation rod 11a that can be attached to the small construction machine main body is about 4 m, and the connection rod 11b having a small diameter is attached to the excavation rod 11a.

JP 2011-106253 A JP 2013-234557 A

  However, in the ground excavation by the hydraulic solidifying material liquid replacement column construction apparatus 11, when the construction depth of the hydraulic solidification material liquid replacement column exceeds 4 m, the excavation rod 11a completely enters the ground, and FIG. As shown in (a), the small-diameter connecting rod 11b enters the ground for a further required length. Then, since a gap G is generated between the connecting rod 11a in the excavation hole H through which the excavation rod 11a has passed and the wall surface of the excavation hole H, the wall surface of the excavation hole H at that part is not supported by anything. It becomes. Therefore, the ground pushed by the excavation rod 11a from the moment when the wall surface of the excavation hole H becomes a free surface starts to elastically return in the direction of the arrow to reduce the diameter of the excavation hole H as shown in FIG. Earth pressure and water pressure promote the movement, and the borehole H further reduces its diameter at the site.

  Next, the excavation rod 11a that has reached a predetermined depth stops the excavation, and is pulled up as shown in FIG. 13C while discharging the hydraulic solidified material liquid from the discharge port 14 of the excavation head 12. At this time, the elastic return portion P of the wall surface of the reduced excavation hole H is caused by the flat shoulder portion (stepped portion between the excavation rod 11a and the connection rod 11b) 11c of the excavation rod 11a protruding outward from the connection rod 11b. As shown in FIGS. 13 (c) and 13 (d), the shaved earth and sand Q are lifted while being accumulated on the shoulder 11c, and finally lifted to the ground as shown in FIG. 13 (e). Discharged. When the total amount of the discharged earth and sand Q is not negligible at the construction site, there are inconveniences such as incurring a secondary disaster on excavation work and extra costs for disposal of remaining soil. In addition, if the earth and sand accumulated on the shoulders fall during the construction of the excavating rod, it may hit a worker working on the ground and cause a personal injury.

  The present invention eliminates the above-described conventional problems, and the object of the present invention is to reduce the elastic return of the excavation hole reduced by the elastic return of the wall surface when the excavation rod is pulled up from the excavation hole. Forcibly kneading to the wall surface with a conical connection or spiral wing, thereby avoiding the discharge of the earth and sand of the elastic return to the ground, and excavation work with the earth and sand accumulated on the ground It is to obtain a hydraulic solidifying material liquid replacement column building apparatus capable of avoiding the secondary disaster and the generation of residual soil processing costs.

In order to achieve the above object, a hydraulic solidifying material liquid replacement column building apparatus according to claim 1 of the present invention is located above a large diameter drilling rod for excavating a region of the ground forming a hydraulic solidifying material liquid replacement column. In the hydraulic solidifying material liquid replacement column building apparatus to which a small-diameter connecting rod serving as a grip portion of an auger motor that rotates the excavating rod is connected,
A connection portion between the excavation rod and the connection rod is formed in a conical shape.

  With this configuration, when the excavating rod is pulled up by holding the connecting rod having a small diameter by the auger motor, the connecting portion between the connecting rod and the excavating rod becomes smaller in the direction from the excavating rod to the connecting rod. Because it is conical, the conical connecting part whose gradient changes in the direction of small diameter is to knead the earth and sand of the elastic return of the wall surface in the excavation hole facing the outer periphery of the connection rod to the wall side of the excavation hole Then, while rotating, it pushes and expands to the position where the diameter of the drilling hole becomes the original in the outer diameter direction of the drilling rod. For this reason, the situation where the earth and sand for the said elastic return in a wall surface is scraped off does not generate | occur | produce, but after pulling up a drilling rod, the original drilling hole diameter is maintained. As a result, despite the lifting of the excavation rod, the conventional problem that the earth and sand in the excavation hole is placed on the connecting portion and discharged to the ground and accumulated as residual soil can be solved. As described above, when the construction depth of the hydraulic solidifying material liquid replacement column exceeds the length of the drilling rod and the connecting rod connected to the drilling rod enters the ground and then is pulled up to the ground, it is elastic to the wall of the drilling hole. Even if there is a return, the elastic return soil will not be pulled up to the ground while being scraped off.

  In the hydraulic solidifying material liquid replacement column building apparatus according to claim 2 of the present invention, the gradient of the conical connecting portion is 10 degrees to 45 degrees in angle with respect to the axis of the excavation rod and the connecting rod. It is characterized by that.

  With this configuration, it is possible to prevent cutting earth and sand from being placed on this connection part or to prevent a small amount of earth and sand placed on the connection part from being discharged to the ground while suppressing the processing cost of the connection part. The ground excavation suitable for the geology and the like can be efficiently performed at an appropriate angle within the range of 10 to 45 degrees.

  According to a third aspect of the hydraulic solidifying material liquid replacement column building apparatus of the present invention, when the excavating rod is pulled up in the forward direction on the side surface of the conical connection portion, a spiral blade in a direction in which thrust is generated downward. Is fixed.

  With this configuration, when the excavation rod is pulled up from the excavation hole, the earth and sand that has elastically returned to the excavation hole by the spiral blade are forcibly moved downward along the side surface of the conical connection portion, and the excavation rod moves to the wall surface of the excavation hole. Since it is kneaded to the side, the effect of preventing the elastic return soil from being discharged to the ground is further improved.

  According to a fourth aspect of the hydraulic solidifying material liquid replacement column building apparatus of the present invention, the maximum rotational diameter of the spiral blade is equal to or less than the outer diameter of the excavating rod.

  With this configuration, the drilling hole is initially formed by kneading the elastic return earth and sand against the wall of the drilling hole while avoiding the spiral blades scraping in the direction of expanding the inner wall of the drilling hole when the drilling rod is pulled up. The diameter of the drilling hole can be maintained.

  Moreover, the hydraulic solidifying material liquid replacement column building apparatus according to claim 5 of the present invention is characterized in that the connecting portion between the excavation rod and the connecting rod can be connected via an adapter.

  With this configuration, it is possible to replace the above-mentioned connecting portion that has been worn by receiving a frictional force in the excavation process of the ground, and by using this exchanging rod and connecting rod repeatedly, the operation of the hydraulic solidifying material liquid replacement column building apparatus can be performed. Can be realized at low cost.

According to a sixth aspect of the present invention, there is provided the hydraulic solidifying material liquid replacement column building apparatus, wherein the excavating rod is disposed above the large diameter excavating rod for excavating a region of the ground forming the hydraulic solidifying material liquid replacement column. In the hydraulic solidifying material liquid replacement column building apparatus to which a connecting rod having a small diameter that is a gripping part of an auger motor to be rotated is connected,
A connecting portion having a spiral blade in a direction in which a thrust is generated in the downward direction when the excavating rod is rotated and pulled up is provided immediately above the step portion generated between the excavating rod and the connecting rod.

  With this configuration, when the excavation rod is pulled up from the excavation hole, the spiral blade cuts the elastic return of the excavation hole by a flat shoulder at the upper end of the excavation rod (stepped portion between the excavation rod and the connecting rod). Is fed so as to be kneaded to the wall surface side of the excavation hole facing the outer periphery of the excavation rod. For this reason, the effect is inferior to the case where the spiral blade is provided on the side surface of the conical connection portion described above, but even in this configuration, the earth and sand corresponding to the elastic return is not discharged to the ground by the lifting of the excavation rod. There is no sediment accumulation on the ground.

  Furthermore, the hydraulic solidifying material liquid replacement column building apparatus according to claim 7 of the present invention is such that the maximum rotation diameter of the spiral blade in the hydraulic solidifying material liquid replacement column building apparatus according to claim 6 is equal to the outer diameter of the excavation rod. It is characterized by being equivalent or less.

  With this configuration, since the maximum rotation diameter of the spiral blade is equal to or less than the outer diameter of the excavation rod, the spiral blade does not scrape the wall surface of the excavation hole when the excavation rod is pulled up. Accordingly, while avoiding scraping the wall surface of the drilling hole in the direction in which the spiral blade expands the diameter of the drilling hole when the drilling rod is pulled up, the earth and sand for the elastic return are kneaded to the wall surface of the drilling hole, The original drilling hole diameter can be maintained.

According to a eighth aspect of the present invention, there is provided the hydraulic solidifying material liquid replacement column building apparatus, wherein the drilling rod is disposed above a large diameter drilling rod for excavating a region of the ground where the hydraulic solidifying material liquid replacement column is formed. In the hydraulic solidifying material liquid replacement column building apparatus to which a connecting rod having a small diameter that is a gripping part of an auger motor to be rotated is connected,
A plurality of triangular plate pieces that are gradually lowered from the excavation rod side toward the connection rod side are provided immediately above the step portion generated between the excavation rod and the connection rod at predetermined intervals around the rod. The present invention is characterized in that a suitable connecting portion having a conical shape as a whole is provided.

  With this configuration, when the excavation rod is rotated and pulled up from the excavation hole, the earth and sand from which the elastic return portion of the excavation hole has been scraped off by the flat shoulder at the upper end of the excavation rod (stepped portion between the excavation rod and the connecting rod) It is supported by the shoulder and lifted while filling and accumulating between each triangular plate piece of the connection part, but since the connection part also rotates by rotation of the excavating rod, the earth and sand filled and accumulated between each triangular plate piece is The triangular plate pieces are filled and fixed, and together with each triangular plate piece, a conical lump is formed. Therefore, since it is pulled up in a conical lump after that, the conical lump is formed as in the case where the connecting portion between the excavation rod and the connecting rod is formed in a conical shape. The connecting part is kneaded to the wall side of the excavation hole with the elastic return of the wall surface in the excavation hole facing the outer periphery of the connection rod by a conical gradient, while rotating in the outer diameter direction of the excavation rod, Push it to the position where it will be the original borehole diameter. For this reason, the situation that the earth and sand corresponding to the elastic return on the drilling wall surface is scraped off and lifted does not occur, and the original drilling hole diameter is maintained after the drilling rod is pulled up. As a result, despite the lifting of the excavation rod, the earth and sand for elastic return in the excavation hole is prevented from being placed on the stepped portion and discharged to the ground and accumulated as residual soil. The earth and sand discharged to the ground is only a part of the lump that is filled and fixed between the triangular plate pieces, and is slight.

  The hydraulic solidifying material liquid replacement column building apparatus according to claim 9 of the present invention is characterized in that a maximum rotation diameter of the triangular plate piece is equal to or less than a rotation diameter of a drilling rod.

With this configuration, since the maximum rotation diameter of the triangular plate piece is equal to or less than the excavation rod rotation diameter, the triangular plate piece does not scrape the wall surface of the excavation hole when the excavation rod is pulled up. In addition, the maximum rotation diameter of the conical block formed by filling and fixing the earth and sand between the triangular plate pieces is equal to or less than the rotation diameter of the excavating rod. Therefore, when the excavation rod is pulled up, the elastic return soil is kneaded to the wall of the excavation hole while avoiding the triangular plate pieces and the lump from scraping the wall of the excavation hole in the direction of expanding the excavation hole diameter. Thus, the drilling hole can be maintained at the original drilling hole diameter.
In the present invention, “large diameter” of the large diameter drilling rod and “small diameter” of the small diameter connecting rod are used as terms of large diameter and small diameter in the comparison of the diameter of the drilling rod and the connecting rod. doing.

  According to the present invention, when the excavation rod is pulled up from the excavation hole, the elastic return sediment generated on the wall surface of the excavation hole is not scraped off and discharged to the ground, so that the sediment accumulates on the ground. By doing so, it is possible to avoid the occurrence of secondary disasters due to earth and sand falling at the excavation work site, generation of residual soil treatment costs, and personal injury due to earth and sand accumulated on the shoulder during the lifting of the excavating rod.

  The present invention has been briefly described above. The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

It is a front view which shows the hydraulic solidification material liquid substitution column construction apparatus by embodiment of this invention. It is a front view which expands and shows a part of hydraulic solidification material liquid substitution column construction apparatus in FIG. It is explanatory drawing (a) (b) (c) (d) (e) which shows the construction procedure of the hydraulic solidification material liquid substitution column implemented using the hydraulic solidification material liquid substitution column construction apparatus in FIG. It is a front view which shows the hydraulic solidification material liquid substitution column construction apparatus by other embodiment of this invention. It is the A section enlarged front view of the hydraulic solidification material liquid substitution column construction apparatus in FIG. It is a front view which shows the hydraulic solidification material liquid substitution column construction apparatus by further another embodiment of this invention. It is a front view which shows the hydraulic solidification material liquid replacement column construction apparatus by further another embodiment of this invention. It is a front view which shows the hydraulic solidification material liquid replacement column construction apparatus by further another embodiment of this invention. It is an expansion perspective view which shows the principal part of the hydraulic solidification material liquid replacement column construction apparatus shown in FIG. It is a perspective view explaining the effect | action of the hydraulic solidification material liquid replacement column shown in FIG. It is a front view which shows the conventional hydraulic solidification material liquid substitution column construction apparatus. Explanatory drawing (a) (b) (c) (d) (e) (f) which shows the construction procedure of the hydraulic solidification material liquid substitution column implemented using the hydraulic solidification material liquid substitution column construction apparatus in FIG. (G). It is explanatory drawing (a) (b) (c) (d) (e) which shows the condition where the elastic return part produced in the wall surface of a digging hole is discharged | emitted on the ground surface in the construction procedure of FIG.

Hereinafter, a hydraulic solidifying material liquid replacement column building apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 10.

  FIG. 1: shows the front view of the hydraulic solidification material liquid substitution column construction apparatus concerning one Embodiment of this invention. The hydraulic solidifying material liquid replacement column building apparatus 1A of this embodiment has a drilling rod 1a having a drilling head 2 at the lower end, and a diameter serving as a gripping part of an auger motor that rotates the drilling rod 1a via a connecting part 1c. A small connecting rod 1b. That is, the connecting rod 1b is connected to the upper end of the excavating rod 1a via the connecting portion 1c. Among these, the excavation head 2 is a conical head having a conical shape whose diameter decreases in the downward direction in the present embodiment, and an excavation blade (spiral blade) 3 is fixed on the peripheral surface thereof. A hydraulic solidifying material liquid discharge port 4 is provided at a position not overlapping with the blade 3. The discharge port 4 is provided with a backflow prevention valve for preventing backflow of earth and sand. Further, the discharge port 4 communicates with an inner pipe (not shown) that is a passage for the hydraulic solidifying material liquid.

  The form of the excavation head 2 is not particularly limited, and a conventionally known one can be adopted. However, a conical head having a conical shape in which an excavation blade (spiral blade) 3 is fixed on the peripheral surface as in this example. When it is 2, not only the excavation property in the ground is good, but also the formation of a lump at the excavation part does not physically occur, so there is no fear of the excavation lump being mixed in the hydraulic solidifying material liquid replacement column. Further, the conical head 2 may be integrally fixed to the excavation rod 1a or may be detachably connected. For example, when the conical head 2 is detachably connected to the excavation rod 1a by a joint, there is an advantage that the conical head 2 can be easily replaced during wear. On the other hand, when the conical head 2 is fixed to the excavation rod 1a by welding, for example, the joint portion is not necessary, and the manufacturing cost is reduced.

  Further, the hydraulic solidifying material liquid discharge port 4 faces the outer periphery of the conical head 2, and the diameter of the hydraulic solidifying material liquid is not particularly limited, and may be the same as before, but in order to increase the discharge pressure of the hydraulic solidifying material liquid, A nozzle structure with a small size may be used. The discharge pressure of the hydraulic solidifying material liquid required here is a level that allows the hydraulic solidifying material liquid to be forcibly infiltrated into the ground around the hole formed by the excavation of the excavating rod 1a. The size of the discharge port 4 is, for example, 3 mm to 10 mm in diameter. Since the infiltration amount of this hydraulic solidified material varies depending on the structure and properties of the excavated ground, the diameter of the discharge port 4 is adjusted within the range of 3 mm to 10 mm as necessary, or a discharge port member having an appropriate diameter ( It is good also as a structure which replaces | exchanges (not shown). In addition, as shown in FIG. 1, the number of discharge ports 4 is not limited to one, and two or more discharge ports 4 may be provided as long as a predetermined protrusion pressure can be secured. Furthermore, the direction of the discharge port 4 is arbitrarily set to a direction perpendicular to or intersecting with the conical surface of the conical head 2 and further to a horizontal direction.

  The excavation rod 1a has the same diameter over its entire length, and the conical head 2 is attached to the lower end thereof. The connecting rod 1b is smaller in diameter than the excavating rod 1a. The connecting portion 1c has a conical shape whose diameter decreases in the direction from the excavating rod 1a to the connecting rod 1b. As described later, when the excavating rod 1a is pulled out from the excavation hole H in the ground, elastic return is achieved. The wall surface of the excavation hole H reduced in diameter acts to push and expand in the outer diameter direction of the excavation rod 1a while rotating forward. The angle (gradient) of the conical surface of the connecting portion 1c with respect to the axis of the excavation rod 1a or the connection rod 1b is the excavation diameter reduced by elastic return when the excavation rod 1a is pulled up from the excavation hole H to the ground. Without scraping off the wall surface of the hole H, the angle of the elastic return P is kneaded to the wall surface efficiently. The angle θ may be 45 degrees or less as shown in FIG. 2, but it can be kneaded to the wall surface of the excavation hole H almost certainly while suppressing lifting of the earth and sand on the connecting portion 1c to the ground. It is preferable to set it to 10 to 30 degrees.

  In this case, by processing (chamfering) a portion where the connecting rod 1a and the connecting portion 1c are continuous in a smooth circular arc surface having a radius R of 100 mm in FIG. Suppress standing. As a result, when the excavation rod 1a is pulled up from the excavation hole H, it is reliably prevented that the wall surface of the excavation hole H reduced in diameter by the elastic return is cut off at the portion where the excavation rod 1a and the connecting portion 1c are continuous. be able to.

  In order to build a hydraulic solidifying material liquid replacement column with the hydraulic solidifying material liquid replacement column building apparatus 1A having such a configuration, the building apparatus 1A is mounted on a construction machine, as in the case shown in FIG. The center of the tip of the conical head 2 is set at a predetermined pile center position on the ground. Subsequently, the auger motor holding the holding portion of the connecting rod 1b is driven to cause the excavating rod 1a to penetrate into the ground as shown in FIG. As a result, the excavation rod 1a starts excavation into the ground, and during the excavation, the excavation blade (spiral blade) 3 on the conical head 2 enters so as to push the earth and sand generated by the excavation into the wall surface of the excavation hole H. Then, the excavation rod 1a enters a predetermined depth of the ground. Further, during excavation of the excavation rod 1a, the earth and sand in contact with the peripheral surface of the excavation rod 1a is pressed against the wall surface toward the outer diameter direction (arrow direction) of the excavation rod 1a so as to form the wall surface of the excavation hole H. .

  Further, when the excavation by the excavation rod 1a is continued, the small-diameter connecting rod 1b continuing to the upper portion of the excavation rod 1a is moved into the excavation hole H by excavation as shown in FIGS. 3 (a) and 3 (b). Get in. That is, when the small diameter connecting rod 1b exists in the excavation hole H through which the excavation rod 1a has passed, a gap G is generated between the wall surface of the excavation hole H and the connection rod 1b. For this reason, the wall surface of the excavation hole H facing the gap G is a free surface that cannot be supported by anything. Therefore, after the wall surface of the excavation hole H becomes a free surface, the wall surface of the excavation hole H pushed and expanded by the excavation rod 1a starts elastic return, and an elastic return P as shown in FIG. . Subsequently, when the excavation rod 1a continues excavation and reaches a preset depth, the excavation is stopped.

  Next, following the excavation stop of the excavation rod 1a, the excavation rod 1a is rotated forward as shown in FIG. 3 (c) while discharging the hydraulic solidified material liquid from the discharge port 4 in the conical head 2. Pull up. When the excavating rod 1a is pulled up, the conical connecting portion 1c rotates the elastic return P generated on the wall surface of the excavating hole H facing the connecting rod 1b as described above from the lower portion toward the upper portion. As shown in FIG. 3 (d), the wall surface is pushed in from the lower side to the upper side to recover the excavation diameter by the excavation rod 1a.

  Furthermore, when the excavation rod 1a continues to be pulled up, as shown in FIG. 3 (e), the conical connecting portion 1c is located on the ground together with the connecting rod 1b. Even when the excavation rod 1a is pulled up, the conical connecting portion 1c pushes the elastic return P generated on the wall surface of the excavation hole H close to the ground surface so as to be kneaded to the wall surface. For this reason, accumulation of earth and sand around the excavation hole H on the ground can be avoided. Therefore, there will be no secondary disaster or residual soil disposal cost at the excavation work site based on the sediment deposited on the ground. Further, when the excavation rod 1a is pulled up to the ground, there is no accumulation of earth and sand on the shoulder of the excavation rod 1a, so there is no risk of the earth and sand falling, and the workers on the ground can work safely.

  In addition, in the above, it is desirable that the angle θ of the conical connection portion 1c is as small as possible. However, the processing cost becomes high. It is possible to increase. Conversely, if the angle θ is reduced, the height of the connecting portion 1c increases, and thus the manufacturing cost increases. Therefore, as described above, the angle θ is 10 degrees or more and 45 degrees or less, preferably 15 degrees to 30 degrees.

FIG. 4 is a front view showing a hydraulic solidifying material liquid replacement column building apparatus according to another embodiment of the present invention, and FIG. 5 is an enlarged front view of part A of FIG.
The hydraulic solidifying material liquid replacement column building apparatus 1B of this embodiment, when pulling the excavating rod 1a to the outer peripheral surface of the conical connecting portion 1c between the excavating rod 1a and the connecting rod 1b by forward rotation, This is a case where the spiral blade 5 in the direction to be generated is fixed, and the others are the same as those of the above-described embodiment. Therefore, the same components are denoted by the same reference numerals, and other detailed descriptions are omitted.

  Therefore, according to the hydraulic solidifying material liquid replacement column building apparatus 1B of this embodiment, when the excavation rod 1a is excavated to a predetermined depth and then pulled up from the excavation hole H, the spiral blade 5 elastically returns the excavation hole H. Forcibly move the sediment of P to the lower side along the side of the conical connecting portion and knead it to the wall surface of the excavation hole with the excavation rod 1a, so that the sediment of the elastic return component P is discharged to the ground. Can be reliably prevented. This effect is higher than that of the conical connection 1c alone.

  FIG. 6 is a front view of a hydraulic solidifying material liquid replacement column building apparatus according to still another embodiment of the present invention. In the hydraulic solidifying material liquid replacement column building apparatus 1C of this embodiment, the spiral blade 5 is provided on the outer periphery of the connection portion 1d between the excavation rod 1a and the connection rod 1b. Here, the connecting portion 1d is formed to have the same diameter as the connecting rod 1b having a small diameter and a predetermined length. Further, by making the maximum rotational diameter of the spiral blade 5 substantially equal to the outer diameter of the drilling rod 1a, the wall surface of the drilling hole H is scraped in a direction in which the spiral blade 5 expands the drilling hole H diameter when the drilling rod 1a is pulled up. While avoiding this, the earth and sand of elastic return P can be kneaded to the wall surface of the excavation hole H. Thereby, the excavation hole H can be maintained at the original excavation hole H diameter. When the excavating rod 1a is pulled up from the excavation hole H, the spiral blade 5 is elastically cut back by the edge of the shoulder 1e of the excavating rod 1a protruding outward from the connecting rod 1b and the connecting portion 1d. The P earth and sand is pumped downward, and further acts to forcibly press (apply) to the wall surface of the excavation hole H. Due to the action of the spiral blade 5, the earth and sand of the elastic return P generated on the wall surface of the excavation hole H is not discharged to the ground. The spiral direction of the spiral blade 5 is opposite to the spiral direction of the excavating blade 3 provided on the conical head 2.

  The hydraulic solidifying material liquid replacement column building apparatus 1C shown in FIG. 6 has no conical connection portion 1c between the excavation rod 1a and the connection rod 1b, and the excavation rod between the excavation rod 1a and the connection rod 1b. There is a step due to the shoulder portion 1e of 1a, but since the spiral wing 5 is provided immediately above the shoulder portion 1e, even if the earth and sand of the elastic return portion P is placed on the shoulder portion 1e and pulled up. Then, it moves downward with the spiral blade 5 and kneads it on the wall surface of the excavation hole H, so that the sand of the elastic return portion P of the shoulder portion 1e is eliminated, so that the earth and sand of the elastic return portion P can be prevented from being discharged to the ground. .

  FIG. 7 shows a front view of a hydraulic solidifying material liquid replacement column building apparatus according to still another embodiment of the present invention. The hydraulic solidifying material liquid replacement column building apparatus 1D of this embodiment is the same as the embodiment shown in FIG. 6 except that the spiral direction of the spiral blade 5 is opposite to that of FIG. That is, when the construction machine pulls up the excavation rod 1a from the inside of the excavation hole H while rotating the excavation rod 1a in the reverse direction, the spiral direction of the spiral blade 5 is also opposite to the above as shown in FIG. Also in this case, when the excavation rod 1a is pulled up from the excavation hole H, the spiral blade 5 opposes the earth and sand of the elastic return portion P scraped by the flat shoulder 1e at the upper end of the excavation rod 1a to the outer circumference of the excavation rod 1a. It will be sent to be kneaded to the wall surface side of the excavation hole H. For this reason, the earth and sand are not discharged | emitted on the ground by the raising of the excavation rod 1a, and the residual soil accumulation on the ground does not arise. Therefore, there is no risk of personal injury due to earth and sand falling.

FIG. 8 is a front view showing a hydraulic solidifying material liquid replacement column building apparatus according to still another embodiment of the present invention, and FIG. 9 is an enlarged view showing a main part of the hydraulic solidifying material liquid replacement column building apparatus shown in FIG. FIG. 10 is a perspective view for explaining the operation of the hydraulic solidifying material liquid replacement column building apparatus shown in FIGS.
The hydraulic solidifying material liquid replacement column building apparatus 1E of this embodiment is an auger motor that rotates the excavating rod 1a above a large diameter excavating rod 1a for excavating a region of the ground forming the hydraulic solidifying material liquid replacement column. A connecting rod 1b having a small diameter to be a gripping portion is connected, and the connecting rod 1b side from the excavating rod 1a side is directly above the stepped portion (shoulder portion) 1e formed between the excavating rod 1a and the connecting rod 1b. A plurality of triangular plate pieces 7 whose height gradually inclines toward the surface is provided at predetermined intervals around the rod, and a suitable connection portion 6 having a conical shape as a whole is provided. That is, the connecting rod 1b is connected to the upper end of the excavating rod 1a via the connecting portion 6 in which a plurality of triangular plate pieces 7 are provided upright at predetermined intervals.

  As a result, when the excavation rod 1a is rotated and pulled up from the excavation hole, the elastic return portion P of the excavation hole is scraped off by the flat shoulder (step portion between the excavation rod 1a and the connecting rod 1b) 1e at the upper end of the excavation rod 1a. The earth and sand are supported on the stepped portion (shoulder portion) 1e and lifted while being filled and accumulated between the triangular plate pieces 7 and 7 of the connecting portion 6, but the connecting portion 6 also rotates by the rotation of the excavating rod 1a. Therefore, the earth and sand filled and accumulated between the triangular plate pieces 7 and 7 are filled and fixed between the triangular plate pieces 7 and 7, and together with the triangular plate pieces 7, as shown in FIG. It is formed in the lump body 8. Therefore, after that, since the conical lump 8 is pulled up while being held, similarly to the embodiment shown in FIGS. 1 and 2, the connection portion 6 that has become the conical lump 8 is The earth and sand of the elastic return portion P of the wall surface in the excavation hole facing the outer periphery of the connecting rod 1b due to the conical gradient is kneaded on the wall surface side of the excavation hole, and the initial direction of the excavation rod 1a is rotated while rotating. Push it to the position that will be the diameter of the borehole. For this reason, the situation that the earth and sand of the elastic return portion P on the wall surface of the drilling hole is scraped off and lifted (pulled up) does not occur, and the original drilling hole diameter is maintained after the drilling rod 1a is pulled up. As a result, in spite of the lifting of the excavation rod 1a, it is possible to prevent the earth and sand of the elastic return P in the excavation hole from being put on the stepped portion 1e and discharged to the ground and accumulated as residual soil. In addition, it is possible to prevent a secondary disaster at the excavation work site and an extra cost such as disposal of residual soil.

  Further, the maximum rotation diameter of the triangular plate piece 7 in the building apparatus 1E is equal to or less than the rotation diameter of the excavation rod 1a. Since the excavation hole is formed by the excavation rod 1a, the diameter of the excavation hole is substantially the same as the diameter of the excavation rod 1a. Therefore, if the maximum rotation diameter of the triangular plate piece 7 is larger than the rotation diameter of the excavation rod 1a, the wall surface of the excavation hole is scraped off. It is preferable that the maximum rotation diameter of the triangular plate piece 7 is equal to or less than the rotation diameter of the excavation rod 1a because the triangular plate piece 7 does not scrape the wall surface of the excavation hole when the excavation rod 1a is pulled up. Further, when the maximum rotation diameter of the triangular plate piece 7 is equal to or less than the rotation diameter of the excavating rod 1a, the conical lump 8 formed by filling and fixing earth and sand between the triangular plate pieces 7 and 7 is provided. The maximum rotation diameter is also equal to or less than the rotation diameter of the excavation rod 1a. Therefore, when the excavation rod 1a is pulled up, the elastic plate portion 7 and the lump 8 avoids scraping the wall surface of the excavation hole in the direction in which the diameter of the excavation hole is expanded, and the earth and sand of the elastic return P is removed from the wall surface of the excavation hole. The drilling hole can be maintained at the original drilling hole diameter.

  In FIG. 9, a part of the triangular plate piece 7 of the connection portion 6 is notched, but this notch is a portion to which the pin 9 of the joint is attached. In FIG. 8, this notch is omitted. This notch portion is necessary when the connection portion 6 having the triangular plate piece 7 is provided at the upper end of the excavation rod 1a by a joint, and is not necessarily required.

  Further, the conical connection portion 1c or the connection portion 1d having the spiral blade 5 may be provided integrally with the excavation rod 1a and / or the connection rod 1b. Moreover, it can also be made usable as an adapter which is an independent single construction part by being mounted between the excavation rod 1a and the connecting rod 1b. In this case, when the surface of the connecting portion 1c or the spiral blade 5 of the connecting portion 1d is worn due to frictional force in the ground excavation process, it can be replaced with a new one as a replaceable part. As a result, the same excavation rod 1a and connecting rod 1b can be used over a long period of time, which contributes to a reduction in construction costs.

  Further, by setting the maximum rotation diameter of the spiral blade 5 to be substantially equal to or less than the outer diameter of the excavation rod 1a, the spiral blade 5 further expands the diameter of the excavation hole H by the excavation rod 1a when the excavation rod 1a is pulled up. The wall surface of the excavation hole H can be eliminated, and the excavation hole H can be kept at the diameter of the excavation hole H as originally designed.

  As described above, the hydraulic solidifying material liquid replacement column building apparatus 1A according to the present embodiment has a large-diameter excavation rod 1a for excavating the ground to form the replacement column and an auger motor gripping portion for rotating the excavation rod 1a. And a connecting portion 1c between the excavating rod 1a and the connecting rod 1b is formed in a conical shape.

  As a result, the conical connecting portion 1c pushes the elastic return portion P of the reduced drilling hole H wall surface in the outer diameter direction of the drilling rod 1a to a position where the diameter of the initial drilling hole H is reached. For this reason, the original diameter of the excavation hole H is maintained, without the earth and sand for the said diameter reduction in a wall surface being scraped off. As a result, in spite of the lifting of the excavation rod 1a, the earth and sand in the excavation hole H is not put on the connecting portion 1c and discharged to the ground. There is no accumulation. In addition, there is no risk of personal injury due to earth and sand falling.

  Further, the hydraulic solidifying material liquid replacement column building apparatus 1B according to the present embodiment attaches the drill rod 1a to the outer peripheral surface of the conical connection portion 1c between the large diameter drill rod 1a and the small diameter connection rod 1b. This is a configuration in which the spiral blade 5 in a direction in which a thrust is generated downward is fixed when pulled up by forward rotation.

  Accordingly, when the excavation rod 1a is pulled up from the excavation hole H, the spiral blade 5 forcibly moves the earth and sand of the elastic return portion P of the excavation hole H downward along the side surface of the conical connection portion. Since it is kneaded on the wall surface of the excavation hole in 1a, the earth and sand of the elastic return P is prevented from being discharged to the ground.

  Further, the hydraulic solidifying material liquid replacement column building apparatus 1C, 1D according to the present embodiment includes a large-diameter excavation rod 1a for excavating the ground for forming a replacement column, and an auger motor gripping portion for rotating the excavation rod 1a. A connecting rod 1b having a small diameter, and a connecting portion 1d having a spiral blade 5 for generating a thrust downward when the excavating rod 1a is pulled up is provided between the excavating rod 1a and the connecting rod 1b. is there.

  As a result, when the excavation rod 1a is pulled up from the excavation hole H, the spiral blade 5 cuts the elastic return portion P of the wall surface that reduces the diameter of the excavation hole H by the flat shoulder 1e at the upper end of the excavation rod 1a. The earth and sand on 1e will be sent so that it may be kneaded with the wall surface of the excavation hole H facing the outer periphery of the excavation rod 1a. For this reason, the earth and sand in the excavation hole H will not be discharged | emitted on the ground by the raising of the excavation rod 1a, and it can avoid that earth and sand accumulate | store as residual soil on the ground.

  The hydraulic solidifying material liquid replacement column building apparatus of the present invention avoids the elastic return portion of the drilling hole wall being scraped off by the drilling rod when the drilling rod is pulled up from the drilling hole. Has the effect of avoiding secondary disasters in excavation work based on earth and sand accumulated on the ground and incurring the cost of residual soil treatment. It is useful for hydraulic solidifying liquid replacement column construction equipment used for the foundation method of relatively light structures such as small-scale buildings and dirt slabs.

1A, 1B, 1C, 1D, 1E Hydraulic solidifying material liquid replacement column building apparatus 1a Drilling rod 1b Connection rod 1c Conical connection 1d Connection 1e Shoulder
2 Conical head 3 Excavation blade 4 Discharge port 5 Spiral blade 6 Connection part 7 Triangular plate piece 8 Lump 9 Pin H Excavation hole P Elastic return part Q Sedimented earth and sand

Claims (9)

Hydraulic solidification formed by connecting a small-diameter connecting rod serving as a gripping portion of an auger motor for rotating the excavating rod above a large-diameter excavating rod for excavating an area forming the hydraulic solidifying material liquid replacement column of the ground In material / liquid replacement column construction equipment,
A hydraulic solidifying material liquid replacement column building apparatus characterized in that a connecting portion between a drilling rod and a connecting rod is formed in a conical shape.   2. The hydraulic solidifying material liquid replacement column building apparatus according to claim 1, wherein a gradient of the conical connection portion is 10 to 45 degrees with respect to an axis of the excavation rod and the connection rod.   3. The hydraulic solidification according to claim 1, wherein a spiral blade is fixed to a side surface of the conical connection portion in a direction in which a thrust is generated downward when the excavation rod is pulled up in a normal rotation. 4. Material liquid replacement column building equipment.   The hydraulic solidifying material liquid replacement column building apparatus according to claim 3, wherein the maximum rotation diameter of the spiral blade is equal to or less than the outer diameter of the excavation rod.   The hydraulic solidifying material liquid replacement column building apparatus according to any one of claims 1 to 4, wherein a connecting portion between the excavating rod and the connecting rod is connectable via an adapter. Hydraulic solidification formed by connecting a small-diameter connecting rod serving as a gripping portion of an auger motor for rotating the excavating rod above a large-diameter excavating rod for excavating an area forming the hydraulic solidifying material liquid replacement column of the ground In material / liquid replacement column construction equipment,
The water is characterized in that a connecting portion having a spiral blade in a direction in which a thrust is generated downward when the excavating rod is rotated and pulled up is provided immediately above the step portion generated between the excavating rod and the connecting rod. Hard solidifying material liquid replacement column building equipment.   7. The hydraulic solidified material liquid replacement column manufacturing apparatus according to claim 6, wherein a maximum rotation diameter of the spiral blade is equal to or less than an outer diameter of the excavation rod. Hydraulic solidification formed by connecting a small-diameter connecting rod serving as a gripping portion of an auger motor for rotating the excavating rod above a large-diameter excavating rod for excavating an area forming the hydraulic solidifying material liquid replacement column of the ground In material / liquid replacement column construction equipment,
A plurality of triangular plate pieces that are gradually lowered from the excavation rod side toward the connection rod side are provided immediately above the step portion generated between the excavation rod and the connection rod at predetermined intervals around the rod. A hydraulic solidifying material liquid replacement column building apparatus characterized in that a suitable connection portion having a conical shape as a whole is provided.   The hydraulic solidifying material liquid replacement column building apparatus according to claim 8, wherein the maximum rotation diameter of the triangular plate pieces is equal to or less than the excavation rod rotation diameter.

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