JP5507752B1 - Underground material burial method - Google Patents

Abstract

[Object] To embed a small-diameter, low-strength underground material by any intrusion method, and to reduce the cost of the underground material burial method and the simple structure used therefor, which can be injected into the ground by any method and generate less excavated soil. To provide a hollow tube tip cap that can be produced.
The hollow tube is disposed at the tip of the hollow tube, is taken into the ground by the penetration of the hollow tube, and is left in the ground after the hollow tube is pulled out. A bottom plate portion 1 that is in contact with the tip and press-fitted into the ground, and a bottom plate that enters the hollow tube 50 and restricts the horizontal movement of the hollow tube 50 and supports the underground-side tip portion of the buried material. A hollow tube tip cap 10 having a cylindrical protrusion 2 extending upright in the center of the portion 1.
[Selection] Figure 2

Description

  In the present invention, a low-strength pipe-like material used for geothermal use or the like, or a relatively small-diameter underground material such as a drain material that induces a jet flow when liquefied, is taken into the ground and left behind. The present invention relates to a medium buried material burying method and a hollow tube tip cap used therefor.

  In recent years, the use of natural energy has attracted attention, and technological development using geothermal energy is progressing. Geothermal heat changes little over the course of the year, and various methods utilizing its characteristics have been developed. However, there is currently no burying method that allows simple, effective, and low cost pipe-type equipment that uses geothermal heat.

  Conventionally, when a buried object such as a pipe-shaped equipment is buried deep underground, a hole that is slightly larger than the buried object is excavated in advance, and then the buried object is buried in the excavated hole. However, in this construction method, when the buried object was buried after excavating the hole, it was not possible to bury it smoothly due to collapsed soil or the like.

  JP-A-2004-52335 discloses a cylindrical shape in which a casing is inserted into the ground using a construction machine for erection of a casing, and a linear synthetic resin is stacked in the erected casing. A drain placing method is disclosed in which a filter is attached around the drainage material, a drain material connected at an arbitrary length is inserted, and then the casing is pulled out to leave the drain material in the ground. In this method, after the drain material is inserted, the casing is pulled out with the drain material and the tip closing bit left as a weight.

  As such a tip closing bit, in JP-A-10-159079, a disc portion to be attached to a tip bit of a sheath tube is formed at a tip portion of a substantially inverted conical shape, and on the outer peripheral surface of the disc portion. It is disclosed that a locking portion that locks rotation in one direction is provided, and further, a soil removal groove that facilitates press-fitting of the sheath tube is formed from the tip portion to the outer peripheral surface of the disk portion.

JP 2004-52335 A JP-A-10-159079

  However, since the tip closing bit of Japanese Patent Laid-Open No. 10-159079 rotates with the rotation of the sheath tube (hollow tube) and penetrates into the ground, the locking portion and the soil removal groove for retaining the sheath tube Is indispensable, and there is a problem that the structure is complicated and the manufacturing cost is increased. Moreover, the penetration of the sheath tube into the ground requires rotation, and there is a problem that a penetration method such as non-rotating driving cannot be used.

  Accordingly, an object of the present invention is to allow underground injection of a small-diameter, low-strength underground material such as a drain material that induces a jet flow during liquefaction by any penetration method, and excavated residual soil. An object of the present invention is to provide an underground material embedding method with less generation of a hollow tube and a hollow tube tip cap that can be manufactured at a low cost with a simple structure used therefor.

That is, the present invention solves the conventional problems, and includes a hollow tube with a spiral rotating blade whose vertical length between the start point and the end point of the blade is H ₀ , and the tip of the hollow tube. A bottom plate portion press-fitted into the contact area, and a height extending into the center of the bottom plate portion that enters the hollow tube and restricts the lateral movement of the hollow tube is H ₀ or more. A hollow tube tip cap having a protrusion and an underground material, and a method of burying the hollow tube tip cap and the underground material in the ground, The I step of bringing the tip of the hollow tube into contact with the tip of the hollow tube so that the protrusion is inserted, and the hollow tube by inserting the hollow tube, II step of press-fitting into the hollow tube, III step of charging the underground material into the hollow tube from the end on the ground side of the hollow tube, and the hollow tube on the ground Withdrawal, there is provided a underground materials embedded method for the IV step of leaving behind hollow tube end cap and 該地 Buried materials in the ground, and performing.

  According to the present invention, a hollow tube tip cap (hereinafter also simply referred to as “tip cap”) that closes the tip of a hollow tube has a simple structure and can be manufactured at low cost. Moreover, according to the embedding method of the present invention, underground material having a small diameter and low strength can be injected into the ground by any penetration method, and there is little generation of excavated soil.

It is a perspective view of the tip cap in an embodiment of the invention. It is explanatory drawing which shows the relationship between the front-end | tip cap of FIG. 1, and a hollow tube. It is sectional drawing of the state which the front-end | tip cap of FIG. 1 and the front-end | tip of the hollow tube contact | abutted. It is a figure explaining the underground burial material burial construction method using the tip cap of Drawing 1, and a process progresses from (A) to (D). It is a figure explaining a guide hollow tube in the underground burial material burial method of this example. It is a figure explaining a 2nd guide hollow tube in the underground burial material burial method of this example. It is a perspective view which shows the modification of a front-end | tip cap. It is a perspective view which shows the other modification of a front-end | tip cap. It is a simplified diagram showing an example of a hollow tube with a spiral blade. (B) is a fragmentary perspective view which shows an example of the hollow tube with a square spiral blade, (A) is a figure explaining the blade shape before the spiral process of a square spiral blade. It is a figure explaining the material picking of a square spiral blade and a circular spiral blade. It is another figure explaining the material picking of a square spiral blade and a circular spiral blade.

  Next, the tip cap in the embodiment of the present invention will be described with reference to FIGS. The tip cap 10 is a separate member from the hollow tube 50, and only abuts with each other when penetrating and is not formed with an engaging portion or the like that engages with the hollow tube 50. That is, the tip cap 10 is disposed at the tip of the hollow tube 50 and is press-fitted into the ground by the penetration of the hollow tube 50, and is left in the ground after the hollow tube 50 is pulled out. The tip cap 10 is in contact with the tip 51 of the hollow tube 50 and is press-fitted into the ground, and the bottom plate enters the hollow tube 50 and restricts the horizontal movement of the hollow tube 50. A protrusion 2 extending upright is provided at the center of the portion 1. The tip cap 10 can be easily obtained by welding a short cylindrical protrusion at the center of the disk. Examples of the cylindrical protrusion include a circular cylindrical tube or a rectangular cylindrical tube.

  In the distal end cap 10, the bottom plate portion 1 closes the distal end opening of the hollow tube 50, and a contact surface 11 on the bottom plate portion, on which the distal end surface 51 of the hollow tube 50 abuts, is on the outer side of the protruding portion 2. Since it has, it has a part (protruding part) which protrudes outside from the hollow tube 50 in planar view. The projecting length (degree of protrusion) of the outer projecting portion is such that when the hollow tube 50 comes into contact with the bottom plate portion 1, even if a core misalignment (deviation from the center in the lateral direction) occurs, the tip of the hollow tube 50. It is sufficient that the opening is kept closed. If core misalignment occurs and a gap is generated at the tip opening of the hollow tube 50, soil may enter through this gap and the tube may be blocked, and the underground material 60 cannot be left underground. On the other hand, when the outside protrusion is too large, the penetration resistance increases, which is not preferable. In addition, if the guide hollow tube 70 mentioned later is used, even if the protrusion degree is large, a core shift | offset | difference can be suppressed.

In the tip cap 10, the protrusion 2 has a function of entering the hollow tube 50 and restricting the movement of the hollow tube 50 in the lateral direction. The height of the protrusion 2 may be a height that is sufficient to restrict the lateral movement of the hollow tube 50, but in order to avoid underground obstacles when penetrating the hollow tube 50 with a spiral blade, The spiral blade may be pulled up by reverse rotation for one pitch of the spiral blade (reference numeral H _{0 in} FIG. 9). In addition, it is preferable that the height of the spiral blade is 2 pitches or more. The protrusion 2 is used to place the underground material 60 or to support (accommodate) the underground side tip of the underground material 60. For example, the cylindrical short tube and the rectangular tube Shaped short tube. When protrusions 2 are short pipe, a underground materials 60, the hollow portion in the short pipe may be placed in a standing shape (hollow portion of the code inside diameter W ₀ in FIG. 3), also, the upper surface of the short pipe You may put it on. Therefore, the protrusion 2 may be a columnar (solid) object that does not have a space portion therein.

When the protrusion 2 is a circular short tube, the dimensional relationship in the radial direction between the tip cap 10 and the hollow tube 50 is as shown in FIG. That is, the outer diameter W ₁ of the protrusion ₂ is smaller than the inner diameter W ₂ of the hollow tube 50 and forms a gap. Due to the presence of the gap, when the hollow tube 50 is pulled out, it can be pulled out smoothly without resistance. The outer diameter W ₃ of the hollow tube 50 is smaller than the outer diameter W ₄ of the bottom plate portion 1, and the bottom plate portion 1 has a portion 111 that protrudes outward from the hollow tube 50 in plan view. As a result, when the hollow tube 50 abuts against the bottom plate portion 1, the end opening of the hollow tube 50 is maintained closed even if a core misalignment occurs. Note that the short tube having the quadrangular protrusion 2 has a greater effect of preventing misalignment as the corners protrude than the circular short tube in which the circular shape is inscribed in the square shape.

  In the tip cap 10, the bottom plate portion 1 is not limited to the circular shape as shown in FIG. Even if it is a square-shaped baseplate part, there exists an effect substantially the same as a circular baseplate part. Moreover, as shown in FIG. 7, the front-end | tip cap 10a provided with the front-end | tip protrusion 3 extended below from the back surface of the baseplate part 1 may be sufficient. Even when the hollow tube 50 is rotationally penetrating, the bottom plate portion 1 does not substantially rotate because the contact portion slides. However, by providing the tip protrusion 3, the tip protrusion 3 bites into the ground, and the rotational force can be reliably suppressed. When the bottom plate portion 1 rotates, when the underground material 60 is inserted into the hollow tube 50 and penetrates into the ground, the underground material 60 rotates in the hollow tube 50, and the hollow tube 50. There is a risk of damaging the outer peripheral surface by colliding with the inner wall. The tip protrusion 3 serves as a tip cone when penetrating into a hard ground. One or more tip protrusions 3 may be provided. Further, the tip of the tip cap 10 may be pointed. The length of the tip protrusion 3 is appropriately determined.

  In the tip cap 10, the bottom plate portion 1 is not limited to a circular shape as shown in FIG. 1, and as shown in FIG. 8, the bottom plate portion 1 stands upright from the disc-shaped bottom plate main body portion 12 and the peripheral end portions of the bottom plate main body portion 12. It may be a bottom plate portion 1a composed of a peripheral wall portion 13 extending in the direction. In the tip cap 10 b, the bottom plate main body portion 12 between the protruding portion 2 and the peripheral wall portion 13 serves as the contact surface 11 with which the tip surface 51 of the hollow tube 50 abuts. By providing the peripheral wall portion 13, even if the hollow tube 50 is misaligned, the hollow tube 50 only moves between the protrusion 2 and the peripheral wall portion 13, and the end opening of the hollow tube 50 is blocked. The state can be maintained. In addition, the peripheral wall portion 13 has a function of suppressing soil removal when the hollow tube 50 is inserted, and when the hollow tube 50 is pulled out, the resistance with the surrounding ground becomes large, and the hollow tube 50 50 and the tip cap 10 are easily separated. Further, the bottom shape of the raised bottom plate portion 1 is not limited to a flat surface. For example, the tip shape on the ground side may be pointed. Thereby, penetration resistance can be reduced.

  Next, an underground material embedding method (hereinafter also simply referred to as “material embedding method”) in the embodiment of the present invention will be described with reference to FIG. The material embedding method in this example is a method of using the tip cap 10, the hollow tube 50, and the underground embedding material 60, and embedding the tip cap 10 and the underground embedding material 60 in the ground, The I step of bringing the tip of the hollow tube 50 into contact with the tip cap 10 so that the protrusion 2 enters the tube 50, and the hollow tube 50 penetrating the tip cap 10 together with the hollow tube 50. II step of press-fitting into the hollow tube 50, III step of introducing the underground material 60 into the hollow tube 50 from the end on the ground side of the hollow tube 50, drawing the hollow tube 50 to the ground, And IV process for leaving the underground buried material 60 in the ground. In addition, the said process does not limit an order, For example, you may perform the II process and III process reversely.

  In the step I, first, the tip cap 10 is set at the ground surface burying position point P of the underground material 60. For example, the distal end of the hollow tube 50 is attached to the distal end cap so that the radial center of the hollow tube 50 set upright in a rotary press-fitting device (not shown) and the radial center of the distal end cap 10 substantially coincide with each other. 10 (FIG. 4A). In this case, the tip cap 10 and the hollow tube 50 have a gap between the inner wall of the hollow tube 50 and the tip cap 10 as shown in FIG. As long as it exists in the pipe 50, the hollow pipe 50 may cause misalignment. Even if the hollow tube 50 is misaligned, the distal end opening of the hollow tube 50 is closed, and the underground material 60 can be embedded in the IV process. Through the step I, the protrusion 2 enters the hollow tube 50, and the tip of the hollow tube 50 and the bottom plate portion 1 of the tip cap 10 come into contact with each other. When the tip cap 10 is set at the ground embedding position point P, a small through hole is made in the protruding portion of the tip cap 10 and a fixing means such as a nail is driven into the through hole so that the installation position can be accurately set. Fixed and stable.

  Examples of the hollow tube 50 include a hollow tube without a rotating blade and a hollow tube with a rotating blade. Although it depends on the soil quality, even a hollow pipe without a rotating blade can be sufficiently penetrated into the ground by impact pressing or rotary pressing if the diameter is 300 mm at the maximum. Therefore, the present invention can be applied to burying a small-diameter underground material 60. In the present invention, the diameter of the hollow tube is smaller than the minimum width of the bottom plate portion 1. That is, the diameter of the hollow tube is such that the outer contour of the bottom plate portion 1 of the tip cap 10 can be seen in plan view when the tip of the hollow tube is brought into contact with the tip cap 10.

Examples of the hollow tube with a rotating blade include a hollow tube with a spiral blade. As a hollow tube with a spiral blade, there is a spiral hollow tube 50a with a rotating blade whose vertical length between the start point and the end point of the blade is H ₀ as shown in FIG. In this case, when the height of the protruding portion 2 of the tip cap 10 is H ₀ or more, in order to avoid underground obstacles in the underground penetration of the hollow tube 50a, This is pulling up by one stroke (H ₀ ) or less, and this is preferable in that the tip cap 10 is not detached from the hollow tube 50a.

  The spiral hollow tube with rotating blades is not limited to the hollow tube with tip blades, and may be, for example, two or more (multistage) helical tubes with rotating blades. What is necessary is just to determine the installation number of rotary blades suitably with steel pipe pile length, soil quality, etc. The blade diameter of the spiral blade varies depending on the length and soil quality of the hollow tube, and cannot be determined unconditionally. However, the maximum is 6 times the hollow tube diameter, and the minimum hollow tube diameter + (4 cm) is preferable.

  Examples of the multistage spiral hollow tube with rotating blades include a hollow tube 50b in which the second stage is a square spiral blade as shown in FIG. The square spiral blade can be made from a square plate. A square spiral blade is obtained by hollowing out a disk having an outer diameter corresponding to the hollow tube diameter at the center of a square plate whose diagonal is the same as the blade diameter, and then obtaining this intermediate diameter. A part is cut along the direction, the continuous ring-shaped object is divided, the ends are separated by a predetermined interval, and the whole is processed so as to gradually become a predetermined inclination angle. This square spiral blade is joined to the steel pipe by welding.

  As shown in FIG. 10B, the quadrilateral blade 52a in which the second stage blade is made of a quadrangular plate material is preferable in that excavation resistance can be reduced and manufacturing cost can be reduced. The reason why the manufacturing cost can be reduced will be described with reference to FIGS. The left figure in FIG. 11 shows, for example, the material removal when a disk 56a having a diameter of 10 cm is collected from a 10 cm square square plate 55a, and the right figure shows a 10 cm square of a square plate 56b having a diagonal length of 10 cm. It is the figure which each showed the material removal in the case of extract | collecting from this square plate material 55b. The square blades occupy as much as 0.62 times the area (49% / 78.5%) of the material compared to the circular blades, thus saving material costs. In addition, cutting is performed by shearing from a square plate material 55b of 10 cm square. The cutting length of the square blade (7 cm × 2) is significantly shorter than the cutting length of the circular blade (10 cm × π), The straight line machining is easier than the curved line machining, and the machining cost can be greatly reduced from this point. Further, when nine circular blades 56c are taken from the rectangular plate material 55c, the 16 rectangular blades 56d can be taken from the square plate material 55d of the same size if the rectangular blades are used (see FIG. 12). Thus, although the circular blade 56c and the square blade 56d have a large difference in area, the locus of the actual turning radius is the same. In FIG. 10B, the second stage blade is one, but the tip blade may be a square blade, and all of the multistage blades may be a square blade.

  Examples of means for penetrating the hollow tube 50 include known penetrating means such as rotational penetration by an auger, striking penetration by dropping a monken, and vibration penetration by a water jet. Among these, the rotation penetrating means is preferable in terms of low vibration and less residual soil.

  The underground material 60 is a pipe-shaped material for geothermal use, rainwater use, groundwater use, or liquefaction countermeasures, and is a member buried in the ground together with the tip cap 10. Geothermal materials can be used as a facility for geothermal heat pumps and the like because geothermal heat changes little during the year from day to night. In addition, buried materials for groundwater and rainwater can be applied to temporary disaster wells after a major earthquake. In addition, as underground materials for liquefaction countermeasures, pipe pipes with slits and through-holes formed on the peripheral surface are pre-embedded in the ground, assuming liquefaction. Examples include drainage materials that induce flow.

  The underground embedding material 60 has an outer diameter smaller than the inner diameter of the hollow tube 50 and is placed on the protruding portion 2 or the tip portion is stored in the cylindrical protruding portion 2. To be taken and buried. Even if the underground embedding material 60 is a low-strength pipe such as a polystyrene foam or a polyvinyl chloride pipe, the tip cap 10 does not rotate, and therefore, it does not receive an external force substantially. The underground embedding material 60 may be formed with slits, through holes, etc., depending on the purpose of use. The length of the underground material 60 is not limited in length, and is appropriately determined according to the application. Moreover, when the length is as long as several tens of meters, a plurality of pieces can be used together.

  The step I is not limited to the method shown in FIG. 4 (A), and a packing (not shown) is interposed between the hollow tube 50 and the projection 2 to prevent the tip cap 10 from dropping in advance at the tip of the hollow tube 50. May be retained. Thereby, on the ground, the hollow tube 50 to which the tip cap 10 is integrally attached can be placed horizontally, and the long underground buried material 60 can be inserted into the hollow tube 50 in advance. It is necessary to raise the long underground buried material 60 to a certain height to load the standing hollow tube 50 with the long underground buried material 60. It is easy to insert the long underground buried material 60 into the hollow tube 50 placed. As the packing to be used, for example, an O-ring is used. The packing has such a holding strength that the tip cap 10 does not fall from the hollow tube 50 and is torn when the hollow tube 50 is rotationally press-fitted. If the packing is not broken when the hollow tube 50 is rotationally press-fitted, the tip cap 10 cannot be left in the ground when the hollow tube 50 is pulled out to the ground.

  In step I, a guide hollow tube 70 having an inner diameter larger than the outer diameter of the protrusion 2 and an outer diameter smaller than the inner diameter of the hollow tube 50 is prepared. The tip of the guide hollow tube 70 is brought into contact with the bottom plate portion 1 of the hollow tube tip cap 10 (see FIG. 5). The guide hollow tube 70 is a short pipe. When the hollow tube 50 is pulled up in the reverse direction in order to avoid an underground obstacle when the hollow tube 50 penetrates into the ground, the guide hollow tube 70 is separated from the hollow tube 50. The tip cap 10 is prevented from coming off. Therefore, the length (height) of the guide hollow tube 70 is larger than the length (height) of the protrusion 2. Further, a gap is formed between the hollow tube 50 and the guide hollow tube 70. For this reason, in the IV process, when the hollow tube 50 is pulled out, the guide hollow tube 70 is left in the ground together with the tip cap 10 and the underground material 60. There may or may not be a gap between the protrusion 2 and the guide hollow tube 70. Note that the guide hollow tube 70 may be mounted in advance or fixed to the tip cap 10 before the tip cap 10 contacts the tip of the hollow tube 70. Further, the guide hollow tube 70 exhibits an anti-centering effect that restricts the radial movement of the hollow tube 50 when the gap between the hollow tube 50 and the protrusion 2 of the tip cap 10 is large. When the guide hollow tube 70 is used, the underground material 60 may be placed on the guide hollow tube 70.

  In the step I, when the hollow tube 50 is rotationally press-fitted, a friction reducing member or a friction reducing agent may be interposed on the contact surface of the bottom plate portion 1 of the tip cap 10 with the hollow tube. Thereby, rotation of the hollow tube 50 becomes smooth. Examples of the friction reducing member include a ring-shaped sheet member made of a friction reducing material such as a fluororesin. Moreover, fats and oils are mentioned as a friction reducing agent.

  The step II is a step that is performed after the step I, and is a step in which the hollow tube 50 is inserted to press the tip cap 10 into the ground together with the hollow tube 50. When the guide hollow tube 70 is attached, the hollow tube 50, the tip cap 10, and the guide hollow tube 70 are taken into the ground by penetrating the hollow tube 50 (FIG. 4B). ). In this example, a hollow tube without a rotating blade is used as the hollow tube 50, and the penetration means is press-fitting by rotation. Note that the underground material 60 may be installed in the hollow tube 50 in advance before performing the step II.

  In step II, the hollow tube 50 is rotationally press-fitted. That is, a rotational force and a pushing force are applied to the hollow tube 50 by the penetration means. Thereby, the hollow tube 50 is entrained while pushing the tip cap 10 into the ground. Further, the tip cap 10 closes the tip opening of the hollow tube, and there is no entry of soil into the hollow tube 50. Further, although the hollow tube 50 rotates, the tip cap 10 only slides with the tip of the hollow tube 50 and does not rotate. For this reason, for example, when the underground material 60 is loaded in advance in the hollow tube 50 and in the protrusion 2 of the tip cap 10, the underground material 60 does not rotate and is stable. Can be taken underground. The length of the hollow tube 50 is not limited and is appropriately determined according to the application. Moreover, when the length is as long as several tens of meters, a plurality of pieces can be used together. In the step II, when the hollow tube 50 is hitting an underground obstacle such as a stone during the penetration of the hollow tube 50, the hollow tube 50 may be lifted up a little while trying to reversely rotate and try to penetrate again. Even if pulled up a little, the tip cap 10 does not come off from the hollow tube 50 because of the height of the protrusion 2 of the tip cap 10. Further, if the guide hollow tube 70 or the second guide hollow tube 80 is attached, the tip cap 10 will not be detached from the hollow tube 50 even if the hollow tube 50 is pulled up a little higher. The step II ends when the hollow tube 50 is rotated and penetrated to a predetermined depth and the rotation of the hollow tube 50 is stopped.

  Before the II step or in the middle of the II step, when the projection 2 is a circular tube, a second guide hollow tube 80 having an outer diameter smaller than the inner diameter of the projection 2 is prepared. A two-guide hollow tube 80 can be inserted. In the middle of the step II, for example, when the hollow tube 2 is penetrated, when it hits an underground obstacle such as a stone, it means immediately after the penetration of the hollow tube 2 is stopped. In other words, the second guide hollow tube 80 has an outer diameter smaller than the inner diameter of the protrusion 2 and slips into the cylindrical protrusion 2 (see FIG. 6). The second guide hollow tube 80 is a short pipe, and when the hollow tube 50 is pulled up in the reverse direction in order to avoid an underground obstacle when the hollow tube 50 penetrates into the ground, The tip cap 10 is prevented from coming off from 50. Therefore, the length (height) of the second hollow tube 80 is larger than the length (height) of the protrusion 2. As described above, the operation of the second guide hollow tube 80 is the same as that of the guide hollow tube 70 in that the tip cap 10 is prevented from being detached from the hollow tube 50. It is advantageous in that it can be easily mounted by dropping. There may or may not be a gap between the protrusion 2 and the second guide hollow tube 80. The second guide hollow tube 80 remains in the ground together with the tip cap 10 and the underground material 60 after the IV process. By performing the II step, the hollow tube 50 and the tip cap 10 are press-fitted to a predetermined depth, the hollow tube 50 is in a hollow state, and there is no soil.

  Further, in the step I, the second guide hollow tube 80 may be brought into contact in advance before the hollow tube 50 is brought into contact with the tip cap 10. Thereby, the hollow tube 50 is brought into contact with the tip cap 10 thereafter, but the contact operation of the hollow tube 50 can be performed smoothly. In particular, when the height of the protrusion 20 is low, the setting of the hollow tube 50 may not be easy, but if the second guide hollow tube 80 having a high height and a small diameter is located at the center, The hollow tube 50 is guided by the second guide hollow tube 80 and is easily located in the center of the tip cap 10.

  Step III is a step in which the underground material 60 is thrown into the hollow tube 50 from the end on the ground side of the hollow tube 50 (FIG. 4C). Specifically, the underground material 60 is put into the hollow tube 50 penetrated to a predetermined depth after the II step. In the step I, when the underground material 60 is loaded in the hollow tube 50 in advance, that is, when the step III is performed in the middle of the step I or after the step I and before the step II, the step II. The subsequent III step can be omitted. The underground material 60 may be simply put into the hollow tube 50 and is placed on the cylindrical projection 2 or a part of the tip is stored in the circular projection 2. Installed at. The underground material 60 is preferably installed upright on the tip cap 10, but may be slightly inclined as long as the hollow tube 50 is not lifted up.

  The IV process is a process in which the hollow tube 50 is pulled out to the ground, and the tip cap 10 and the underground material 60 are left in the ground. When the guide hollow tube 70 and the second guide hollow tube 80 are used in the steps I and II, both the guide hollow tube 70 and the second guide hollow tube 80 are left behind in the ground (FIG. 4). (D) In the IV step, the hollow tube 50 is pulled out by reverse rotation, and the hollow tube 50 and the tip cap 10 have a gap between the inner wall of the hollow tube 50 and the protrusion 2, so that the hollow tube 50 The tip cap 10 will not be lifted if it is pulled out, and the hollow tube 50 will be pulled out even if sand or the like bites between the hollow tube 50 and the tip cap 10 and it may be difficult to remove. The tip cap 10 is left behind for the following reason: After the hollow tube 50 has been penetrated to a predetermined depth, the periphery of the hollow tube 50 is a bottom plate as shown in FIG. The hole 90 having the same inner diameter as the outer diameter of the portion 1 is not formed, and FIG. As shown in D), since the lateral earth pressure p acts, the inner wall of the hole 90 swells inward, and the inner diameter of the hole 90 is smaller (reduces) than the diameter of the bottom plate portion 1. After the hollow tube 50 is pulled out, the tip cap 10 is not lifted but left in the ground, and the collapsed soil on the inner wall of the hole 90 prevents the tip cap 10 from being lifted. The underground cap material 60 is placed on the distal end cap 10, and there is this weight. After the hollow tube 50 is pulled out, the distal end cap 10 is not lifted up and left in the ground. In addition, when separation of the hollow tube 50 and the tip cap 10 is concerned, the hollow tube 50 and the tip cap 10 may be separated by dropping monken into the hollow tube 50 from the ground. Lift the hollow tube 50 to the ground, The process ends when the cap 10 and the underground material 60 are left behind in the ground, that is, the hollow tube 50 serves as a tool to be reused. It is applied to geothermal use, rainwater use, groundwater use, and functions as a drain material for liquefaction countermeasures, according to the burial method of this example. Underground materials can be injected into the ground by any method, and there is little generation of excavated soil.

  In the material embedding method of the present invention, when the tip cap 10a shown in FIG. 7 is used instead of the tip cap 10, the tip protrusion 3 bites into the ground, and the rotation of the tip cap 10 can be reliably suppressed. Further, the tip protrusion 3 can serve as a tip cone when penetrating into the hard ground.

  In the material embedding method of the present invention, when the tip cap 10b shown in FIG. 8 is used instead of the tip cap 10, the hollow tube 50 causes a misalignment because the upright peripheral wall portion 13 is provided around the edge. However, the end surface of the hollow tube 50 is located in the peripheral wall portion 13, and the closed state of the distal end opening of the hollow tube 50 is maintained. In addition, the upright peripheral wall portion 13 has a function of suppressing soil discharge when the hollow tube 50 is penetrated, so that the hole wall is pushed to the side, and when the hollow tube 50 is pulled out, The contact with the inner wall surface of the hole 90 increases the frictional resistance, facilitating separation of the hollow tube 50 and the tip cap 10. The higher the height of the peripheral wall portion 13, the greater the soil removal effect during penetration and the frictional resistance during extraction.

  In the material embedding method of the present invention, when a tip cap 10b having a square bottom plate portion is used instead of the tip cap 10 having a circular bottom plate portion, the penetration resistance is increased, but ground resistance such as collapsed soil is increased. The area to receive is increased, and separation of the hollow tube 50 and the tip cap 10 is facilitated.

  In the material embedding method of the present invention, when a hollow tube 50a with spiral blades as shown in FIGS. 9 and 10 is used instead of the hollow tube 50 without rotating blades, the excavation becomes easy, and the hollow tube 50a Underground penetration resistance can be reduced. Therefore, in the hollow tube 50 without rotating blades, the diameter of the hollow tube 50 can only be used up to a diameter of about 300 mm, and the underground buried material 60 is naturally limited to a small diameter. In the case of the attached hollow tube 50a, the maximum diameter of about 600 mm can be used, and the underground material 60 having a large diameter can be used.

  According to the present invention, the tip cap for closing the tip of the hollow tube has a simple structure and can be manufactured at low cost. Moreover, according to the embedding method of the present invention, underground material having a small diameter and low strength can be injected into the ground by any penetration method, and there is little generation of excavated soil.

DESCRIPTION OF SYMBOLS 1 Bottom plate part 2 Cylindrical protrusion part 3 Tip protrusion 10, 10a, 10b Hollow pipe tip cap 50, 50a, 50b Hollow pipe 60 Underground material 70 Guide hollow pipe 80 Second guide hollow pipe

Claims (11)

A hollow tube with a spiral rotating blade whose vertical length between the starting point and the ending point of the blade is H ₀ ;
A bottom plate portion that is in contact with the tip of the hollow tube and press-fitted into the ground, and enters the hollow tube and extends upright in the center of the bottom plate portion that restricts lateral movement of the hollow tube. A hollow tube tip cap having a protrusion having a height of H ₀ or more ;
Using a buried material, a method of burying the hollow tube tip cap and the buried material in the ground,
The I step of bringing the tip of the hollow tube into contact with the tip of the hollow tube so that the protrusion enters the hollow tube, and the hollow tube penetrating the hollow tube together II step of press-fitting a hollow tube tip cap into the ground, III step of introducing the underground material into the hollow tube from the ground-side end of the hollow tube, and the hollow tube An underground material embedding method characterized by performing an IV step of drawing out to the ground and leaving the hollow tube tip cap and the underground material in the ground. 2. The underground material embedding method according to claim 1, wherein the protrusion is a cylindrical protrusion. 2. The underground material embedding method according to claim 1, further comprising an abutting surface on the bottom plate portion, the outer surface of the projecting portion being in contact with a tip surface of the underground penetrating hollow tube. The underground burial material burying method according to any one of claims 1 to 3, wherein the bottom plate portion has a disk shape or a square shape. The bottom plate is ground according to any one of claims 1 to 4, characterized in that it consists of a peripheral wall portion extending from the peripheral edge of the disk-shaped bottom plate main body and the bottom plate main body portion to the upright shape Medium buried material construction method . It has a front-end | tip protrusion extended below from the back surface of this bottom-plate part, The underground burial material burying construction method of any one of Claims 1-5 characterized by the above-mentioned. The underground embedding material burying method according to any one of claims 1 to 6, wherein a gap exists between the inner wall of the hollow tube and the protrusion in the step I. In the step I, a guide hollow tube having an inner diameter larger than the outer diameter of the protrusion and an outer diameter smaller than the inner diameter of the hollow tube is prepared, and the protrusion is placed in the guide hollow tube. to enter, underground materials embedded method of claims 1-7, wherein the to abut the distal end of the guide hollow tube to the bottom plate portion of the hollow tube end cap. Before the II step or during the II step, a second guide hollow tube having an outer diameter smaller than the inner diameter of the cylindrical protrusion is prepared, and the second guide is inserted into the cylindrical protrusion. 9. An underground material burial method according to claim 8 , wherein an empty pipe is inserted. Has a pulling step of reversely rotating the hollow tube, underground materials embedded method of claim 1, wherein the pulling stroke is H ₀ below. The underground material embedding method according to claim 1 , wherein the underground material is a drain material.

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