JP2015140610A - Construction apparatus for hydraulic solidification material liquid-substituted column, construction method for hydraulic solidification material liquid-substituted column, and hydraulic solidification material liquid-substituted column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an increase in in-ground vertical bearing capacity of a hydraulic solidification material liquid-substituted column and an increase in surface friction against fill-up ground and push-in bearing capacity.SOLUTION: An upper part of an excavation rod, in which an excavation head having a discharge opening for a hydraulic solidification material liquid is connected to a lower end, is formed into an inverted cone-shaped part having an outside diameter increased upward from below, and a spiral blade is fixed to an outer peripheral surface of the inverted cone-shaped part.

Description

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

  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, since the column method is agitated and mixed with the in-situ ground and cement slurry, a co-rotation phenomenon occurs when the viscous ground with high adhesive strength is targeted, 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 or solidification of soil cement that is built by stirring and mixing the ground and hydraulic solidifying material liquid is the stirring and mixing of the hydraulic solidifying liquid and the original ground In view of this, the prior art is to build a columnar body only with the hydraulic solidifying material liquid without stirring and mixing the ground 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 a spiral blade on the peripheral surface. In addition, a single-claw type drilling head inevitably generates a lump of dirt that adheres to the claw when rotating, but a conical head can dramatically reduce the amount of sediment that adheres to it, and the drill rod can be pulled up. There is an advantage that earth and sand adhering to the conical head sometimes can be prevented from falling.

  As shown in FIG. 7, the construction procedure by the excavation head and the excavation apparatus of Patent Document 2 includes (a) a excavation head having a spiral excavation blade 32a and a hydraulic solidifying material liquid discharge port 32b on the peripheral surface. (Conical head) 32 is attached to a construction machine (not shown) with a hydraulic solidifying material liquid replacement column construction device 31 comprising a drilling rod 31a without a soil removal mechanism connected to the lower end, and the tip center portion of the drilling head 32 Is set to the pile center position. (B) The digging is performed while the excavating rod 31a is rotated forward. At this time, it is not essential to discharge the hydraulic solidifying material liquid from the discharge port 32b in the excavation head 32. (C) When the predetermined excavation depth is shallower than the length of the excavation rod 31a, the excavation is stopped in a state where a part above the excavation rod 31a is on the ground. (D) When the predetermined excavation depth is deeper than the length of the excavation rod 31a, the excavation is performed until a part of the connecting rod 31b penetrates into the ground, and stops at the predetermined depth position. When the predetermined depth is deeper, the connecting rod 31b may be added. (E) Thereafter, the excavating rod 31a is pulled up in a normal rotation state while discharging the hydraulic solidified material liquid 34 from the discharge port 32b in the excavating head 32. At this time, the pulling speed of the excavation rod 31a and the discharge amount of the hydraulic solidifying material liquid 34 are adjusted so that no negative pressure is generated when the excavation rod 31a is pulled up. Although the rotation direction of the excavation rod 31a at this time may be reverse, the adhering earth and sand of the excavation head 32 is supported by the excavating blades 32a, but the adhering earth and sand of the excavation head 32 is prevented from falling. In order to achieve this, forward rotation is preferred. (F) The excavation rod 31a is pulled up to the ground, the amount of the hydraulic solidifying material liquid 34 is adjusted, and the hydraulic solidifying material liquid 34 is filled to a predetermined depth position.

JP2011-106253A JP2013-234557A

  The hydraulic solidifying material liquid replacement column according to the prior art forcibly displaces the ground sideways by forcibly penetrating the excavation rod 31a into the ground, and then kneads the surrounding ground hole wall with the excavation rod 31a. The shape of the replacement column to be built is formed in a columnar shape. From this construction principle, the hydraulic solidifying material liquid replacement column has a feature that the peripheral friction force is large in the vertical support force. However, hydraulic solidification liquid replacement columns are mainly used for small-scale buildings such as detached houses and foundations for soil slabs. A small machine with relatively small capacity (digging torque, pushing force) is assumed, and the construction principle is that the ground is forcibly displaced laterally by the excavating rod 31a, so the outer diameter of the replacement column is simply increased. It is substantially difficult to do because the ground resistance during excavation can easily be assumed to exceed the excavation capability of the construction machine. Therefore, in actual construction, the outer diameter is most often about 200 mm (in practice, the outer diameter of the steel pipe standard is 216.3 mm). The upper limit of the outer diameter depends on the construction conditions such as the ground conditions, but is estimated to be about 300 mm (actually, the outer diameter of steel pipe standard is 318.5 mm) or less. For this reason, it has been difficult to implement a method for increasing the building diameter and further improving the vertical supporting force per replacement column.

  In addition, when using a hydraulic solidifying material liquid replacement column as the foundation of a detached house that is supported by a relatively soft support layer, the breakdown of the vertical support force is the fact that the peripheral friction force is superior to the tip support force. However, when the diameter of the hydraulic solidifying material liquid replacement column is increased, the vertical bearing capacity increases arithmetically, whereas the amount of hydraulic solidifying liquid used increases geometrically. There was a problem in cost because the cost performance decreased. That is, it is difficult to increase the vertical supporting force by increasing the diameter of the hydraulic solidifying material liquid replacement column in terms of both construction and economy.

  Further, the vertical supporting force of the hydraulic solidifying material liquid replacement column according to the prior art is relatively large as the peripheral surface supporting force per unit area, but the building diameter is as small as about 200 mm. There was a problem that the vertical supporting force per book was small. Therefore, compared to the column method with a relatively large construction diameter of 500 to 600 mm, the number of columns placed by the hydraulic solidification material liquid replacement column of the same length increases, and the number of columns of the hydraulic solidification material liquid replacement column is the same as the column method. In order to increase the vertical support force per piece, it was necessary to make the construction length relatively long. Therefore, when the hydraulic solidifying material liquid replacement column is adopted, there is a problem that the cost may be higher than the conventional column method.

  The residential land on the alluvial ground is generally filled with a good quality of about 1 to 2 m, but the soft ground is thickly deposited below it. Moreover, the pile foundation for detached houses constructed on the ground of such a residential land is functionally a friction pile. However, when friction piles are used on such soft ground, the frictional force of the ground is small, so it is necessary to increase the pile length or increase the number of piles used. Not only was it bad, but it was inconvenient.

  The present invention has been made by paying attention to such conventional problems, and the object of the present invention is to provide a high-strength, solidified column without replacing the construction procedure, without significantly changing the construction procedure. While maintaining high quality stably, the vertical support force can be improved, and in addition, the hydraulic solidifying material liquid replacement column building apparatus, the building method, and the peripheral friction force against the embankment can be increased. It is to obtain a hydraulic solidifying material liquid replacement column.

  In order to solve the above-mentioned problems, a hydraulic solidifying material liquid replacement column building apparatus according to claim 1 of the present invention is an upper portion of a drilling rod in which a drilling head having a discharge port for hydraulic solidifying material liquid is connected to the lower end. However, it becomes an inverted conical portion whose outer diameter increases as it goes upward from below, and a spiral blade is fixed to the outer peripheral surface of the inverse conical portion.

With this configuration, the reverse cone portion of the excavation rod builds a reverse cone-shaped large diameter portion (reverse cone portion) in the replacement column over a predetermined depth of the ground surface layer portion, and the peripheral surface of the replacement column and the ground The support force can be increased and the vertical support force can also be increased. As a result, the pushing support force can be increased. In addition, the spiral blade above the excavating rod has a larger diameter as it goes above the inverted conical portion of the excavating rod, and the surface friction resistance between the inverted conical portion and the ground increases, but the excavation rod increases. Smooth the excavation of the rod into the ground.
Therefore, according to this hydraulic solidifying material liquid replacement column building apparatus, it is possible to build a hydraulic solidifying material liquid replacement column having an inverted conical large diameter portion in the upper part.

  Further, in the hydraulic solidifying material liquid replacement column building apparatus according to claim 2 of the present invention, as it goes upward, the upper part of the excavating rod having the excavating head having the discharge port of the hydraulic solidifying material liquid connected to the lower end. A spiral blade whose rotating outer diameter is increased is fixed.

  With this configuration, the spiral wing of the excavation rod is provided so that its rotating outer diameter increases as it goes upward, so that the cutting blade has an inverted conical enlarged portion (inverted conical portion) over a predetermined depth of the ground. A hole is formed, and this solidified hole is filled with the hydraulic solidification material liquid, so that a hydraulic solidification material liquid replacement column having an inverted conical large-diameter portion in the upper part is constructed. Therefore, it is possible to increase the peripheral friction force of the hydraulic solidifying material liquid replacement column with respect to the ground, and it is possible to increase the supporting force in the vertical direction with respect to the replacement column of the ground, and as a result, it is possible to increase the pushing support force of the replacement column. . Along with this, the spiral wing smoothes the excavation in the ground of the excavation rod.

  In addition, the hydraulic solidifying material liquid replacement column building apparatus according to claim 3 of the present invention is provided with a long length on the outer peripheral surface of the upper portion of the excavating rod having a drilling head having a discharge port for hydraulic solidifying material liquid connected to the lower end. A plurality of steel plates, which are formed so that the outward projecting width increases as they go upward from the lower side of the scale, are provided in a radial manner by being erected along the axial direction.

  With this configuration, the plurality of steel plates provided radially on the outer periphery of the excavation rod have a form in which the outward projecting width (rise width) increases toward the upper side. A hole with an inverted conical enlarged portion (inverted conical part) is formed over a predetermined depth of the ground, and since this hole is filled with hydraulic solidification material liquid, an inverted conical shape is formed in the upper part. A hydraulic solidifying material liquid replacement column having a large diameter portion is constructed. Therefore, it is possible to increase the peripheral frictional force against the ground of the hydraulic solidifying material liquid replacement column, and to increase the vertical supporting force with respect to the ground by the tapered surface of the inverted conical enlarged portion of the hydraulic solidifying material liquid replacement column. As a result, the pushing support force of the hydraulic solidifying material liquid replacement column can be increased.

  According to a fourth aspect of the present invention, there is provided an apparatus for constructing a hydraulic solidifying material liquid replacement column, wherein the upper portion of the excavating rod connecting the lower end of the excavating head having the discharge port of the hydraulic solidifying material liquid is upward from below. A reverse conical portion whose outer diameter increases as it goes, and a plurality of steel plates having substantially the same width are provided on the outer peripheral surface of the reverse conical portion along the axial direction and provided radially. It is characterized by.

  With this configuration, the steel plates erected radially are provided in the inverted conical portion where the outer diameter increases as it goes upward from below the excavation rod, so the rotational diameter of the steel plates increases sequentially as it goes upwards. When excavating with this construction device, a drill hole having an inverted conical enlarged portion can be formed over a predetermined depth of the ground, and the hydraulic solidifying material liquid replacement column can be filled while forming this drill hole. Therefore, a hydraulic solidifying material liquid replacement column having an inverted conical large diameter portion in the upper portion can be constructed. According to this hydraulic solidifying material liquid replacement column, the peripheral frictional force can be increased at the inverted conical large diameter portion, and the supporting force in the vertical direction can also be increased. As a result, the hydraulic solidifying material liquid replacement column The pushing support force can be increased.

  According to a fifth aspect of the present invention, there is provided an apparatus for constructing a hydraulic solidifying material liquid replacement column, wherein the excavation head has a conical conical head having a spiral excavation blade and a hydraulic solidification material liquid discharge port on a side surface. It is characterized by being.

  With this configuration, the excavation head is a conical conical head with a spiral excavation blade fixed on the side surface, so that not only excavation is good, but also the formation of a mass at the excavation part is not possible, so hydraulic There is no risk of mixing excavated soil blocks in the solidified material replacement column.

  According to a sixth aspect of the present invention, there is provided a hydraulic solidifying material liquid replacement column construction method wherein the hydraulic solidifying material liquid replacement column construction device according to any one of the first to fifth aspects is mounted on a construction machine. , Set the center of the tip of the excavation head connected to the excavation rod of the construction device at the pile center position of the ground, proceed with excavation while rotating the excavation rod, stop the excavation when the predetermined depth is reached, and then The excavating rod is rotated and pulled up while discharging the hydraulic solidifying material liquid from the discharge port.

By this method, excavation is performed while rotating the excavation rod, the excavation is stopped when a predetermined depth is reached, and then the excavation rod is rotated and pulled up while discharging the hydraulic solidified liquid from the discharge port of the excavation head. The hole can be filled with a hydraulic solidifying material liquid. The building equipment at this time was
(1) A configuration in which the upper portion of the excavation rod becomes an inverted conical portion whose outer diameter increases as it goes upward from below, and a spiral blade is fixed to the outer peripheral surface of the reverse conical portion,
(2) A configuration in which a spiral wing whose rotation outer diameter increases as it goes upward from below is fixed to the upper part of the excavation rod;
(3) A plurality of steel plates standing vertically along the axial direction are radially provided on the outer peripheral surface of the upper part of the excavation rod, and the amount of protrusion outward (rising up as the plurality of steel plates go upward from below. (Width) is formed large,
(4) The upper part of the excavation rod becomes an inverted conical part whose outer diameter increases as it goes upward from below, and a plurality of steel plates having substantially the same width over the entire length are erected on the outer peripheral surface of the inverse conical part. Therefore, a drilling hole having an inverted conical inner diameter is formed over a predetermined depth of the ground, and the hydraulic solidification material liquid replacement having an inverted conical large diameter portion in the upper part is formed. A column is built. For this reason, not only the peripheral frictional force but also the vertical ground supporting force can be applied to the large diameter portion, and the pushing support force per replacement column can be increased. As a result, the construction length of the replacement column can be shortened or the number of replacement columns can be reduced, and the construction of the hydraulic solidifying material liquid replacement column can be implemented economically.

  A hydraulic solidifying material liquid replacement column according to a seventh aspect of the present invention has an inverted conical large diameter portion in the upper part, which is constructed by the construction method of the hydraulic solidifying material liquid replacement column according to the sixth aspect. It is characterized by that.

With this configuration, the peripheral frictional force is increased, and the vertical ground support force can be applied to the large diameter portion, so that the push-in support force is further increased.
In particular, in a ground with good quality embankment on soft ground, the high-capacity ground support capacity is improved by positioning the inverted cone-shaped large portion of the upper part of the replacement column on the high quality embankment on the surface. It is preferable because it can be used effectively.

  In the present invention, the hydraulic solidifying material liquid refers to a fluid that can be pumped, such as cement slurry (for example, cement milk), mortar, and concrete.

The hydraulic solidifying material liquid replacement column building apparatus, hydraulic solidifying material liquid replacement column building method, and hydraulic solidifying material liquid replacement column according to the present invention have the following effects.
(1) According to the construction device and construction method of the hydraulic solidifying material liquid replacement column of the present invention, while forming a drill hole having an inverted conical enlarged portion over a predetermined depth of the ground, Hydraulic solidifying material liquid can be filled. Therefore, a hydraulic solidifying material liquid replacement column having an inverted conical large diameter portion in the upper portion can be constructed.
(2) Moreover, it is possible to build a hydraulic solidifying material liquid replacement column having an inverted conical large diameter portion in the upper portion without requiring a significant change in the construction procedure.
(3) According to the hydraulic solidifying material liquid replacement column having an inverted conical large diameter portion in the upper portion, the peripheral friction force can be increased at the reverse conical large diameter portion, and the peripheral friction force is increased. A larger vertical support force can be exhibited, and as a result, the push-in support force of the replacement column can be increased.
(4) In the case of a high quality embankment on soft ground, the support capacity of a high quality embankment is determined by positioning the large diameter of the inverted conical shape above the replacement column on the high quality embankment on the surface. Can be used effectively. Therefore, the present invention is effective when applied to a ground having a high-quality embankment such as a residential land on an alluvial ground.

  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 of the construction apparatus of the hydraulic solidification material liquid substitution column which shows embodiment of this invention. It is a front view of the construction apparatus of the hydraulic solidification material liquid substitution column which shows other embodiment of this invention. It is a front view of the construction apparatus of the hydraulic solidification material liquid substitution column which shows other embodiment of this invention. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a front view of the construction apparatus of the hydraulic solidification material liquid substitution column which shows other embodiment of this invention. It is sectional explanatory drawing of the hydraulic solidification material liquid replacement column built with the building method concerning this invention. It is explanatory drawing which shows the conventional hydraulic solidification material liquid substitution column construction method in process order (a) (b) (c) (d) (e) (f).

  FIG. 1: shows the front view of the construction apparatus of the hydraulic solidification material liquid substitution column concerning embodiment of this invention. This hydraulic solidifying material liquid replacement column building apparatus 11A is composed of a drilling rod 13 having a drilling head 12 connected to the lower end thereof. The upper portion of the excavation rod 13 (the upper half of the excavation rod 13) becomes an inverted conical portion 13a whose outer diameter changes greatly as it goes upward, and a spiral blade 14 is fixed to the outer periphery of the reverse conical portion 13a. It is installed. The spiral blade 14 has a constant height with respect to the circumferential surface of the inverted conical portion 13a over its entire length. Accordingly, since the spiral blade 14 is fixed on the outer periphery of the inverted conical portion 13a, the rotational outer diameter of the spiral blade 14 increases toward the upper side of the inverted conical portion 13a even if the height of the spiral blade 14 is constant. growing. The height of the spiral blade 14 may be relatively low. For example, a flat steel or a reinforcing bar having a square cross section may be used. Further, the excavation rod 13 has a cylindrical straight portion 13b having a predetermined diameter at a lower portion of the inverted conical portion 13a (lower half of the excavation rod 13), and the excavation head 12 is connected to the lower end of the straight portion 13b. Has been.

  In this embodiment, the excavation head 12 is a conical cone head having a diameter that gradually decreases downward, and a spiral excavation blade 15 that pushes up excavation earth and sand upward during forward rotation is provided on the peripheral surface of the excavation head 12. A hydraulic solidifying material liquid discharge port 16 is provided at a position that is fixed and does not overlap with the excavating blade 15. Although not shown, the discharge port 16 is provided with a backflow prevention valve for preventing backflow of earth and sand. Further, the discharge port 16 communicates with an inner tube 17 that is a passage of hydraulic solidifying material liquid.

  The form of the excavation head 12 is not particularly limited, and a conventionally known one can be adopted. However, when the excavation blade 15 is conical with the excavation blade 15 fixed on the peripheral surface as in this example, the excavation in the ground is performed. Not only is the property good, but the formation of soil mass in the excavation part does not physically occur, so there is no fear of contamination of the excavation soil mass due to construction in the hydraulic solidifying material liquid replacement column. Further, the excavation head 12 may be integrally fixed to the excavation rod 13 or may be detachably connected. For example, when the excavation head 12 is detachably connected to the excavation rod 13 by a joint, there is an advantage that the excavation head 12 can be easily replaced when worn. On the other hand, when the excavation head 12 is fixed to the excavation rod 13 by welding, for example, the joint portion becomes unnecessary, and thus the production cost is reduced.

In order to build a hydraulic solidifying material liquid replacement column with the hydraulic solidifying material liquid replacement column building device 11A having such a configuration, this building device 11A was attached to a construction machine (not shown) and connected to the excavation rod 13. The center of the tip of the excavation head 12 is set at the pile center position of the ground, and then the excavation rod 13 is forwardly rotated to dig into the ground. During the excavation, the spiral blade 14 of the conical portion 13a of the excavation rod 13 and the spiral excavation blade 15 of the excavation head (conical head) 12 excavate while moving the earth and sand upward. Even if the inverted conical portion 13a having an increased outer diameter exists, the excavation is easy. When the excavation rod 13 reaches a predetermined depth after excavation, the excavation is stopped, and then the excavation rod 13 is rotated forward and pulled up while discharging the hydraulic solidified material liquid from the discharge port 16 of the excavation head 12.
At this time, the pulling speed of the excavating rod 13 and the discharge amount of the hydraulic solidifying material liquid are adjusted so that no negative pressure is generated when the excavating rod 13 is pulled up. Although the rotation direction of the excavation rod 13 may be reversed, the adhering earth and sand of the excavation rod 13 and the adhering earth and sand of the excavation head 12 are supported by the spiral blade 14 and the excavation blade 15, respectively. In order to prevent the fall of earth and sand, the forward rotation is preferable. Then, while lifting the excavating rod 13 to the ground, the amount of the hydraulic solidifying material liquid is adjusted, and the hydraulic solidifying material liquid is filled to a predetermined depth position of the drilling hole.

  Here, the predetermined depth is determined by the reaching position of the excavation head 12, but in the case of a ground having a good quality embankment on soft ground such as an alluvial ground, a high quality embankment portion as shown in FIG. In order to make effective use of the support force, the inverted conical large diameter portion 1a of the hydraulic solidifying material liquid replacement column 1 needs to be positioned in a high quality embankment portion. Therefore, the predetermined depth in such ground means the depth when the inverted conical portion 13a of the excavating rod 13 is located in a high-quality embankment portion.

  The drilling hole excavated by the excavating rod 13 in this way has a cylindrical shape corresponding to the straight portion 13b of the excavating rod 13 on the lower side and an inverted conical shape corresponding to the inverted conical portion 13a of the excavating rod 13 on the upper side. Therefore, the hydraulic solidifying material liquid replacement column formed by filling the drilling hole with the hydraulic solidifying material liquid includes a replacement column 1 having an inverted conical large diameter portion 1a in the upper portion as shown in FIG. Become. Specifically, the hydraulic solidifying material liquid replacement column 1 has a substantially conical shape 1c having a lower end portion corresponding to the excavation head 12 and a columnar shape 1b having a lower portion corresponding to the straight portion 13b of the excavation rod 13. In addition, the upper portion is formed in a reverse cone-shaped large-diameter portion 1 a having a shape corresponding to the reverse cone portion 13 a of the excavating rod 13. According to the hydraulic solidifying material liquid replacement column 1 having the inverted conical large diameter portion 1a at the upper portion, the peripheral friction force can be increased by the reverse conical large diameter portion 1a, and the vertical friction force can be increased. The directional support force can also be increased, and as a result, the pushing support force of the hydraulic solidifying material liquid replacement column 1 can be increased.

  FIG. 2 is a front view showing another embodiment of the apparatus for building a hydraulic solidifying material liquid replacement column according to the present invention. The hydraulic solidifying material liquid replacement column building apparatus 11B of this embodiment is formed by a drilling rod 18 having a drilling head 12 having a discharge port 16 connected to the lower end, and the drilling rod 18 has an outer diameter over its entire length. A spiral blade 19 having a cylindrical shape with an equal slate and having a rotating outer diameter that increases in the upward direction is fixed to the upper part (upper half part), and the other parts are the same as in the previous embodiment. Therefore, the same components are denoted by the same reference numerals, and other detailed descriptions are omitted.

The method of building the hydraulic solidifying material liquid replacement column 1 using this hydraulic solidifying material liquid replacement column building apparatus 11B is the same as that of the above embodiment, and the hydraulic solidifying material liquid replacement column 1 to be built is constructed. 6 has the same shape as that shown in FIG.
That is, the excavation rod 18 is fixed with a spiral blade 19 whose rotating outer diameter increases toward the upper part in the upper portion, and therefore the drilling hole formed by excavating with the excavation rod 18 is the same as in the above embodiment. 6 has an inverted conical enlarged portion, and the hole is filled with the hydraulic solidifying material liquid, so that the hydraulic solidifying material liquid replacement column 1 shown in FIG. 6 is constructed.

  FIG. 3 is a front view showing still another embodiment of a construction apparatus for a hydraulic solidifying material liquid replacement column according to the present invention, and FIG. 4 is a cross-sectional view taken along line AA of FIG. The hydraulic solidifying material liquid replacement column building apparatus 11C of this embodiment includes a drilling rod 21 having a drilling head 12 having a discharge port 16 connected to the lower end. The excavation rod 21 has a columnar shape with the same outer diameter over its entire length, and the outer peripheral surface of the upper portion is long and has a protruding width (height) that increases outward as it goes upward from below. A plurality of steel plates 22 are erected along the axial direction and are provided in a radial manner, and the others are the same as in the above-described embodiment. Other detailed explanation is omitted.

The method of constructing the hydraulic solidifying material liquid replacement column 1 using this hydraulic solidifying material liquid replacement column building device 11C is the same as that of the above embodiment, and the hydraulic solidifying material liquid replacement column 1 to be constructed is constructed. 6 has the same shape as that shown in FIG.
That is, the excavation rod 21 of the hydraulic solidifying material liquid replacement column construction device 11C of this embodiment is long on the outer peripheral surface of the upper portion as shown in FIG. Since the plurality of steel plates 22 having a large projecting width (height) are provided in a standing manner in the axial direction and provided radially, the drilling hole formed by excavating with the excavating rod 21 is also implemented as described above. Since it has an inverted conical enlarged portion on the upper side as in the form, and this hole is filled with the hydraulic solidifying material liquid, the hydraulic solidifying material liquid replacement column 1 shown in FIG. 6 is constructed.

  FIG. 5: is a front view which shows another embodiment of the construction apparatus of the hydraulic solidification material liquid replacement column concerning this invention. The hydraulic solidifying material liquid replacement column building apparatus 11D of this embodiment includes a drilling rod 23 having a drilling head 12 having a discharge port 16 connected to the lower end. The excavation rod 23 becomes an inverted conical portion 23a whose outer diameter increases as the upper portion goes upward from below, and a plurality of steel plates 24 having substantially the same width over the entire length are provided on the outer circumferential surface of the inverted conical portion 23a. The components are erected along the axial direction and are provided in a radial pattern, and the other components are the same as those in the above-described embodiment. Therefore, the same components are denoted by the same reference numerals, and other detailed descriptions are omitted. To do.

The method of constructing the hydraulic solidifying material liquid replacement column 1 using this hydraulic solidifying material liquid replacement column building apparatus 11D is the same as that of the above embodiment, and the hydraulic solidifying material liquid replacement column 1 to be constructed is constructed. 6 has the same shape as that shown in FIG.
That is, the excavation rod 23 of the hydraulic solidifying material liquid replacement column construction device 11D of this embodiment is an inverted conical portion 23a whose outer diameter increases as the upper portion goes upward from below as shown in FIG. On the outer peripheral surface of the inverted conical portion 23a, a plurality of steel plates 24 having substantially the same width are provided upright along the axial direction and provided radially, so that rotation of the steel plates provided up radially is performed. The diameter corresponds to the shape of the inverted conical portion 23a of the excavating rod 23, and increases as it goes upward from below. Therefore, the bore formed by drilling with this drilling rod 23 has an inverted cone-shaped enlarged portion above the same as in the above embodiment, and is filled with hydraulic solidifying material liquid. The hydraulic solidifying material liquid replacement column 1 shown in FIG. 6 is constructed.

  FIG. 6 shows the hydraulic solidifying material liquid replacement column 1 built using the hydraulic solidifying material liquid replacement column building apparatuses 11A, 11B, 11C, and 11D shown in the embodiment. According to this hydraulic solidifying material liquid replacement column 1, since it has the reverse cone-shaped large diameter portion 1a on the upper side, not only can the peripheral surface frictional force be increased, but also on the tapered surface of the reverse cone-shaped large diameter portion 1a. Since the ground reaction force in the vertical direction also acts, the support force in the vertical direction can be increased, and as a result, the pushing support force of the hydraulic solidifying material liquid replacement column 1 can be increased.

  Moreover, in the ground where the ground is a high quality embankment on a soft ground such as an alluvial ground, for example, the ground where a high quality embankment P is formed on the soft ground Q in FIG. By placing the inverted conical large-diameter portion 1a above the material-liquid replacement column 1 in the high-quality embankment P portion, the support force of the high-quality embankment P can be effectively utilized. Thereby, the weak point resulting from the small peripheral frictional force of the soft ground can be overcome, and the construction length of the hydraulic solidifying material liquid replacement column 1 can be shortened or the number of placement can be reduced.

As described above, according to the construction apparatuses 11A, 11B, 11C, and 11D of the hydraulic solidifying material liquid replacement column according to the present embodiment, the diameter of the inverted conical shape is increased upward without significantly changing the construction procedure. The hydraulic solidifying material liquid replacement column having the portion 1a can be built with high strength and high quality.
Further, according to the hydraulic solidifying material liquid replacement column 1 having the inverted conical large diameter portion 1a on the upper side, the frictional force between the reverse conical large diameter portion 1a and the ground increases, and the inverted conical shape increases. Since the vertical ground reaction force also acts on the tapered surface of the large diameter portion 1a, the vertical support force can be increased, and the pushing support force of the hydraulic solidifying material liquid replacement column 1 can be increased.

  The present invention can improve the vertical support force in the large portion of the inverted conical diameter of the hydraulic solidifying material liquid replacement column, and particularly has the effect that the peripheral surface friction force and the pushing support force against the embankment can be increased. Applicable to construction equipment, construction method, hydraulic solidification material liquid replacement column, etc. of hydraulic solidification material liquid replacement column built by small-scale buildings such as built houses and relatively small structures such as soil slabs. And useful.

DESCRIPTION OF SYMBOLS 1 Hydraulic solidification liquid replacement column 1a Large diameter part 1b Straight part 1c Reverse cone part 11A, 11B, 11C, 11D Construction equipment 12 of hydraulic solidification liquid replacement column Excavation head 13, 18, 21, 23 Excavation rod 13a Reverse Conical portion 13b Straight portions 14, 19 Spiral blade 15 Spiral excavation blade 16 Hydraulic solidification material liquid discharge port 17 Inner tube 22, 24 Steel plate

  In the present invention, the hydraulic solidifying material liquid is a self-hardening powder and water such as Portland cement that is hydrated and solidified with water as main components, for example, cement slurry (cement milk), It is a fluid that is made of mortar containing fine aggregates made of sand, etc., and (cement) concrete containing coarse aggregates such as gravel and crushed stone, and can be pumped.

Claims (7)

  The upper part of the excavating rod connected to the lower end of the excavating head having a hydraulic solidifying material liquid discharge port becomes an inverted conical part whose outer diameter increases from the lower part to the upper part, and a spiral blade on the outer peripheral surface of the reverse conical part Is a hydraulic solidifying material liquid replacement column construction device.   A hydraulic wing characterized in that a spiral wing whose rotating outer diameter increases as it goes upward is fixed to an upper portion of a drilling rod connected to a lower end of a drilling head having a discharge port for a hydraulic solidifying material liquid Solidification liquid replacement column construction equipment.   On the outer peripheral surface of the upper part of the excavation rod connected to the lower end of the excavation head having the discharge port of the hydraulic solidifying material liquid, a plurality of long and outwardly projecting widths are formed as going upward from below A construction apparatus for a hydraulic solidifying material liquid replacement column, characterized in that steel plates are erected along an axial direction and provided radially.   The upper part of the excavation rod that connects the excavation head having the discharge port of the hydraulic solidification material liquid to the lower end becomes an inverted conical part whose outer diameter increases from the lower part to the upper part, and the entire length is formed on the outer circumferential surface of the reverse conical part. A hydraulic solidifying material liquid replacement column building apparatus, wherein a plurality of steel plates having substantially the same width are provided in a radial manner in a standing manner along the axial direction.   5. The hydraulic solidification according to claim 1, wherein the excavation head is a conical conical head having a spiral excavation blade and a hydraulic solidification material liquid discharge port on a side surface. 6. Construction equipment for material / liquid replacement column.   The hydraulic solidifying material liquid replacement column construction device according to any one of claims 1 to 5 is attached to a construction machine, and the tip center portion of the excavation head connected to the excavation rod of the construction device is positioned at the pile center position of the ground The excavation rod is rotated and the excavation is performed while the excavation rod is rotated, and when reaching a predetermined depth, the excavation is stopped, and then the excavation head is discharged and the excavation rod is rotated and the excavation rod is rotated and pulled up. Construction method of hydraulic solidifying material liquid replacement column.   A hydraulic solidifying material liquid replacement column, which is constructed by the method for constructing a hydraulic solidifying material liquid replacement column according to claim 6 and has an inverted conical enlarged portion in an upper part.

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