JP4512857B2 - Pile hole drilling rod - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pile hole excavating rod used in a medium excavation method.
[0002]
[Prior art]
An auger head for use in the Nakabori method, which has a kneading plate attached to the shaft, has been proposed (Japanese Utility Model Publication Sho 62-185785). With this auger head, during excavation of the pile hole, the kneading plate is accommodated in the hollow part of the hollow pile, and the kneading plate is projected from the lower side of the hollow pile at a predetermined depth, and the kneading plate is resisted by earth pressure. Opened and leveled the hole wall.
[0003]
Also proposed is a drilling rod provided with kneading blades that can be kneaded to expand between the lower end of the drilling rod with spiral wings for earth removal and the drilling head to level the pile hole wall. (JP-A-6-173254).
[0004]
[Problems to be solved by the invention]
Among the prior arts, in the former, the kneading plate was opened by earth pressure, so when lifting the auger head, the auger head was reversely rotated and the kneading plate was closed by earth pressure. When excavated soil is clogged with the arm that supports the plate, the kneaded plate may not close. In this case, there is a problem that it is difficult to raise the auger head.
[0005]
Further, in the latter case, the provision of the kneading blades causes a portion where the spiral blade is not formed on the excavation rod, and the spiral blade is interrupted, which causes a problem in that the soil removal ability is lowered. In either case, there is a problem that when the soil is discharged from the hollow portion of the hollow pile, the kneading plate or the kneading blade may be an obstacle to the soil removal.
[0006]
[Means for Solving the Problems]
However, in the present invention, since the spiral band for kneading and the vertical gutter for kneading are provided on the outer periphery of the spiral blade, the above-mentioned problems are solved.
[0007]
That the invention provides a drill rod to be used for medium-drilling method, in drill rod having a rod body to form a helical blade which can be accommodated in the hollow portion of the hollow pile around the hollow round tube, the outer periphery of the pre-Symbol spiral wrap A kneading gutter that can be kneaded on the side of the pile hole wall is arranged vertically, and the kneading gutter is provided on the rod body with a support material to constitute a kneading means , and the kneading means comprises: A pile hole excavation rod, which is formed by being deformed by deformation of an elastic material to be configured and accommodated in a hollow portion of the hollow pile.
[0008]
The present invention also relates to an excavation rod for use in an intermediate excavation method, wherein the excavation rod has a rod body in which a spiral wing that can be accommodated in a hollow portion of a hollow pile is formed around a hollow circular pipe. A spiral hole excavation rod characterized in that a spiral band made of an elastic material is attached continuously to the spiral blade, and the outer diameter of the spiral band is formed larger than the outer diameter of the hollow pile. Further, here is a pile hole excavating rod having a spring material interposed between the outer periphery of the spiral wing and the spiral strip, which can urge the spiral band into a shape continuous with the outer periphery of the spiral wing. Moreover, it is a pile hole excavation rod which formed the kneading surface in the outer periphery of a spiral belt.
[0009]
The present invention also relates to an excavation rod for use in an intermediate excavation method, the excavation rod having a rod body formed with a spiral wing that can be accommodated in a hollow portion of a hollow pile around a hollow circular pipe. A plurality of kneaded vertical rods are arranged in a plane circle and in a vertical direction, and the kneaded vertical rods can be projected and retracted radially with respect to the rod body and are urged into a protruding state. It is a pile hole excavation rod characterized by having a shape that can be accommodated in the hollow portion of the hollow pile in a state of being attached to the main body and further closed. Moreover, it is a pile hole excavation rod which attached here the net for kneading which covers the outer periphery of a spiral blade between kneading vertical shafts. The kneading vertical rod is a pile hole excavation rod formed from a material having flexibility, or formed by coating the outer surface of a hard material with an elastic material. Moreover, it is a pile hole excavation rod which connected the kneading downpile with the shaping ring formed from the material which has elasticity.
[0010]
Furthermore, in each said invention, a kneading means, a spiral belt, or a kneading vertical rod is a pile hole excavation rod formed in the rod body at least a part directly above an excavation head.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A spiral band 7 made of an elastic material (rubber or the like) along the outer periphery 3 of the spiral blade 2 is connected and fixed to the rod body 5 having the spiral spiral blade 2 via spring springs 12 and 12. The pile hole excavation rod 10 is configured as described above (FIGS. 1A and 1B).
[0012]
The diameter D of the outer periphery 9 of the spiral band 7 is formed according to the diameter of the pile hole 21 to be kneaded, protrudes downward from the hollow part of the hollow pile 17 and can level the pile hole wall (FIG. 1, 6B and 6C). Further, at the time of storage, the spiral band 7 itself is formed of an elastic material and is further connected by the spring spring 12, so that the spiral band 7 is bent and deformed and the position thereof is changed and stored in the hollow portion 18 of the hollow pile 17. (FIGS. 6A and 6E).
[0013]
In the above, the kneading means was formed from the spiral band 7 made of an elastic material connected to the spiral blade 2 by the spring spring 12, but the pile hole wall 22 can be kneaded by protruding downward from the lower end 19 of the hollow pile 17, If the elastic material can be bent and stored in the hollow portion 18 of the hollow pile 17 at the time of non-kneading, other kneading means can be configured.
[0014]
For example, it is also possible to configure the spiral wings 2 of the rod body 5 by attaching the kneading warps 31 via spring springs 34 so as to be able to appear and retract radially (FIG. 3). Further, the kneading longitudinal rod 31 can be attached to the spiral blade 2 or the hollow circular tube 1 of the rod body 5 via support members 38 and 39 that can be refracted by a spring or the like (FIG. 4). In the case of using these kneaded vertical rods 31, a net 37 made of a flexible material can be attached between the kneaded vertical rods 31, 31. Moreover, the kneading vertical rods 31 and 31 can also be connected by the shaping ring 46 (FIG. 7).
[0015]
Here, it is possible to cope with the ground with relatively little collapse of the pile hole wall by using any of the above-mentioned kneading means. It is desirable to construct (implement) in the form shown in FIG. 3, FIG. 4, and FIG.
[0016]
[Example 1]
(1) An embodiment of the present invention will be described with reference to FIGS.
[0017]
The rod body 5 is formed on the outer periphery of the hollow circular tube 1 by spirally winding the spiral blade 2 over almost the entire length. A spiral band 7 made of an elastic material is disposed along the outer periphery 3 of the spiral blade 2 of the rod body 5 so as to be continuous with the spiral blade 2. Six spring springs 12, 12 are arranged radially at equal intervals between the outer peripheral surface 3 of the spiral blade 2 and the inner peripheral surface 8 of the spiral band 7, and both end portions of the spring spring 12. 13 and 13 are embedded and connected to the spiral blade 2 and the spiral band 7, respectively. By means of the spring springs 12, 12, the spiral band 7 is biased so as to maintain a position along the outer periphery 3 of the spiral blade 2 and a position continuous with the spiral blade 2.
[0018]
Since the spring spring 12 is embedded around the joint end surface of the spiral blade 2 and the spiral band 7, a predetermined thickness (about 4 cm) is required. Further, the spring spring 12 is flexible so that the spiral band 7 can be arranged vertically in the hollow pile 17 and, when kneaded, when the spiral band 7 contacts the pile hole wall 22, It keeps the biased state and has the rigidity that doesn't bend easily.
[0019]
The pile hole excavation rod 10 is configured as described above (FIGS. 1A and 1B). The spiral band 7 is the excavation rod body 5 and is formed about four rounds immediately above the excavation head 15 (FIG. 6A). The diameter D of the outer periphery 9 of the spiral band 7 is formed according to the diameter of the pile hole 21 to be kneaded (FIG. 1A).
[0020]
(2) Next, the use of the pile hole excavating rod 10 of the present invention based on the above embodiment will be described.
[0021]
(a) In the same manner as in the normal Nakabori method, the pile hole excavation rod 10 is inserted into the hollow portion 18 of the hollow pile 17 for medium excavation, and the excavation head 15 is protruded from the lower end 19 of the hollow pile 17 to The hollow pile 17 is lowered while excavating the hole shaft portion 24 (FIG. 6A) .At this time, the spiral band 7 is folded upward and pressed against the inner wall of the hollow pile 17. The spiral Even in the portion where the band 7 is provided, the spiral blade 2 is present and the spiral blade 2 is continuous to the upper side, so that it has a high soil removal capacity as in the prior art.
[0022]
Conventionally, when relatively large gravel is present in the soil, the hollow pile 17 is damaged by being sandwiched between the outer periphery of the spiral blade 2 (usually formed of steel) and the inner wall of the hollow pile 17. However, by providing the spiral band 7 on the outer periphery of the spiral blade 2, the spiral band 7 serves as a cushioning material, and the hollow pile 17 can be prevented from being damaged. Furthermore, since the pile hole excavation rod 10 is rotating in a state where the spiral band 7 is pressed against the inner wall of the hollow pile 17, mud or the like attached to the inner wall of the hollow pile 17 can be removed.
[0023]
(b) When the pile hole 21 reaches a predetermined depth (near the root consolidation part), the descent of the hollow pile 17 is stopped, only the pile hole excavating rod 10 is lowered, and the excavation is continued. Is protruded below the hollow pile 17 (FIG. 6B). At this time, the outer periphery 9 of the spiral band 7 comes into contact with the hole wall 22 of the pile hole 21, and rotates with the rotation of the pile hole excavating rod 10, so that the hole wall 22 is leveled on the outer periphery 9 side of the spiral band 7. it can. Moreover, since the earth is removed by the spiral band 7 and the spiral blade 2, the earth is discharged from the entire cross-section of the pile hole, and the earth removal efficiency can be improved compared to the earth removal by the spiral blade 2 alone.
[0024]
(c) Subsequently, the pile hole excavating rod 10 is reversed to excavate the pile hole widened portion 25 (FIG. 6C). A kneading section having a depth H is formed in the pile hole shaft portion 24 continuous above the pile hole widening portion 25. Even when the pile hole excavating rod 10 is rotated in the reverse direction, the outer peripheral portion of the spiral band is in contact with the pile hole wall, so that the pile hole wall 22 is leveled.
[0025]
(d) When the pile hole excavation is completed, while discharging cement milk from the tip of the pile hole excavation rod 10, replacing the excavated soil or mixing with the excavated soil to form a soil cement, The pile hole excavating rod 10 is pulled up by rotating (FIG. 6D). At this time, the spiral band is folded downward in order from above, and is accommodated in the hollow portion 18 of the hollow pile 17.
[0026]
(e) Subsequently, the lower end of the hollow pile 17 is held down into the pile hole widened portion 25, and the pile hole excavating rod 10 is subsequently pulled up (FIG. 6 (e)). At this time, since the folded spiral band 7 is elastically contacted with the inner wall of the hollow pile 17, some frictional resistance is generated, but since water such as muddy water is present in the portion, it is a great hindrance to the extraction of the pile hole excavating rod 10. There is no.
[0027]
When the pile hole excavating rod 10 is pulled up to the ground and the cement milk or the soil cement is solidified, the construction of the foundation pile is completed (not shown).
[0028]
(f) In the above description, the kneading section is the periphery of the pile hole widening portion 25, but it can be kneaded over the entire length of the pile hole shaft portion 24 (not shown). Of course, the present invention can also be applied to a pile hole 21 that does not form the expanded bottom portion 25 (not shown).
[0029]
Further, since the spiral band 7 is formed of an elastic material, there is no possibility that the lower end portion or the inner surface of the hollow pile is damaged when the spiral band 7 is accommodated in the hollow pile 17 or when the spiral band 7 is taken in or out of the hollow pile 17.
[0030]
(3) Other Embodiments In the above embodiment, the spiral band 7 is formed on the excavation rod body 5 at about four rounds immediately above the excavation head 15, but at least about two rounds at the lower end of the rod main body 5. It only has to be done. Usually, if it is formed about four rounds corresponding to the kneading section, the kneading action is sufficiently achieved.
[0031]
The spiral band 7 can also be provided over the entire length of the pile hole excavating rod 10. In this case, they can be provided continuously or intermittently at predetermined intervals.
[0032]
Further, in the above-described embodiment, the belt-like kneading plate 27 is formed perpendicularly to the outer periphery 9 edge of the spiral band 7, and the upper edge portion 28 and the lower edge portion 29 of the kneading plate 27 are arranged on the center side (hollow The integrated spiral band 7 can also be formed by bending it to the circular tube 1 side (FIG. 2). In this case, since the area of the outer periphery 9 of the spiral band 7 (the area in contact with the pile hole wall 22) can be increased, the efficiency of kneading excavated soil can be increased. Even when the elastic band 7 is formed of the above-described shape, the elastic band 7 is formed of an elastic material, so there is no problem even when passing through the hollow portion 18 of the hollow pile 17.
[0033]
In the above embodiment, the spring spring 12 is used. However, a spring having another shape such as a leaf spring can be used as long as it has a similar function. In addition, the spring may be made of any material such as metal or resin, and may be configured singly or in combination. Moreover, it is also possible to integrally form the same material as the spiral strip from an elastic material such as a synthetic resin without using a separate member spring (both are not shown).
[0034]
[Example 2]
Another embodiment of the present invention will be described with reference to FIGS.
[0035]
The rod body 5 is formed on the outer periphery of the hollow circular tube 1 by spirally winding the spiral blade 2 over almost the entire length. On the outer periphery 3 side of the spiral wing 2 of the rod body 5, kneaded vertical rods 31, 31 are arranged vertically.
[0036]
The kneading vertical rods 31 are arranged in an annular shape at regular intervals in a plan view of four each. Further, the kneading vertical rod 31 is disposed so as to straddle the vertically adjacent spiral blades 2, the upper end portion 32 is bent toward the upper surface 4 side (hollow circular tube 1 side) of the upper spiral blade 2, and the lower end portion 33 is The lower spiral blade 2 is bent toward the lower surface 4a side (hollow circular tube 1 side). In addition, spring springs 34 are arranged radially at equal intervals between the outer peripheral three surfaces of the spiral blade 2 and the kneading longitudinal rod 31, and one end portion 35 of the spring spring 34 is embedded in the spiral blade 2. The other end 36 is fixed to the kneading warp 31.
[0037]
Here, although the four kneading vertical rods 31 and 31 are provided, if there are a plurality of them, two, three or five or more can be used, and the number is not limited.
[0038]
The kneading vertical rods 31, 31 are formed at least directly above the excavation head 15 on the rod body 5 (not shown).
[0039]
Subsequently, a flexible net 37 is stretched between adjacent kneading longitudinal bars 31, 31. The net 37 can be made of any material, but considering the kneading action, the surface preferably has a flat shape with no twist pattern or the like.
[0040]
The pile hole excavation rod 10 is configured as described above (FIGS. 3A and 3B).
[0041]
(2) Since the use of the pile hole excavation rod 10 of the present invention based on the above-described embodiment is the same as that of Embodiment 1, only the outline will be described.
[0042]
(a) That is, like the normal Nakabori method, the pile hole excavation rod 10 is inserted into the hollow part 18 of the hollow pile 17 for excavation, and the hollow pile 17 is lowered while excavating the pile hole shaft part 24. . At this time, the kneading vertical rods 31 and 31 are closed with the spring springs 34 and 34 being contracted, and are accommodated in the hollow portion 18. In this case, the kneading vertical rods 31 and 31 are in elastic contact with the inner wall of the hollow pile 17 but are not in strong elastic contact so as to affect the rotation and elevation of the pile hole excavation rod 10. Moreover, since the inside of the hollow pile 17 is discharged | emitted using the spiral blade 2 over the full length on the pile hole excavation rod 10, the earth removal efficiency is good and the net 37 shrinks along the inner wall of the hollow part 18 of the hollow pile 17. Since it is accommodated in the state (FIG. 3 (c)), there is no problem in soil removal.
[0043]
(b) Next, as in Example 1, only the pile hole excavating rod 10 is lowered, the excavation is continued, the kneading vertical rod 31 protrudes below the hollow pile 17 and the pile hole wall 22 is kneaded ( FIG. 3 (b)). At this time, kneading is performed with the kneading vertical rod 31 and the net 37, and the pile hole wall 22 is leveled, so that the kneading efficiency is good.
[0044]
(c) Subsequently, the pile hole excavation rod 10 is reversed to excavate the pile hole widened portion 25. Even when the pile hole excavating rod 10 is rotated in the reverse direction, the kneading vertical rods 31 and 31 and the net 37 are in contact with the pile hole wall 22, so that the pile hole wall 22 can be leveled only in a predetermined kneading section.
[0045]
(d) When the pile hole excavation is completed, the pile hole excavation rod 10 is pulled up while discharging cement milk if necessary, as in the first embodiment. At this time, since the upper ends 32 of the kneading vertical rods 31 and 31 are bent toward the center, even when excavated soil adheres to the spiral blade 2, the kneading is gradually performed against the spring springs 34 and 34. The vertical fences 31 and 31 can be closed and easily accommodated in the hollow portion 18 of the hollow pile 17.
[0046]
(e) Subsequently, similarly to the first embodiment, the hollow pile 17 is lowered and held, and the pile hole excavating rod 10 is pulled up to the ground. At this time, the kneading vertical rods 31 and 31 are elastically contacted with the inner wall 22 of the hollow pile 17, but there is no big trouble in pulling out the pile hole excavating rod 10. When cement milk is solidified, construction of the foundation pile is completed.
[0047]
(f) In the above description, the kneading section is the periphery of the pile hole widening portion 25, but it can be kneaded over the entire length of the pile hole shaft portion 24 (not shown). Of course, the present invention can also be applied to a pile hole 21 that does not form the expanded bottom portion 25 (not shown).
[0048]
(3) Other Embodiments In the above-described embodiment, the kneading warp 31 is disposed across the spiral blades 2 adjacent to each other in the vertical direction, but may be disposed in the spiral blades 2 adjacent in the vertical direction. Yes (not shown). In this case, the kneading warp 31 is formed with a shorter length than between the spiral blades 2 adjacent in the vertical direction.
[0049]
Also, the kneading means (kneading vertical rod 31 and net 37) of the present embodiment can be provided in the pile hole excavation rod 10 at a plurality of predetermined intervals (not shown).
[0050]
In the above embodiment, since the net 37 is stretched, even if excavated soil exceeding the excavation capacity of the pile hole excavating rod 10 is generated, the excavated soil can be released outside the net 37, and the excavated soil is piled. Although it is possible to prevent clogging with the hole excavation rod 10 (the spiral blade 2, the outer surface of the hollow circular tube 1), the net 37 can be omitted (not shown). In this case, since the pile hole wall 22 is kneaded only with the kneading vertical rods 31, 31, the kneading efficiency is weakened, but the soil removal performance by the spiral blade 2 is maintained.
[0051]
In the above embodiment, the net 37 is stretched, but a sheet can be stretched instead of the net 37 (not shown). In this case, in order to prevent the rotation of the pile hole excavating rod 10 due to the excavating soil or the like and to prevent the sheet from being torn, the sheet is made of a material through which the excavating soil (muddy water) can pass or a through hole is formed. It is desirable to install and configure.
[0052]
Moreover, in the said Example, the spring spring 34 can also be formed from the independent or combination of a leaf | plate spring and other elastic materials similarly to the spring spring 12 of Example 1 (not shown).
[0053]
Moreover, in the said Example, although the material of the kneading vertical rods 31 and 31 is arbitrary, it forms from an elastic material or hard rubber etc. are formed in the outer surface side (part contact | abutted with the inner wall of the hollow pile 17) of a hard material. If the buffer material is covered, the lower end of the hollow pile 17 and the inner wall can be prevented from being damaged (not shown).
[0054]
Moreover, in the said Example, the shaping rings 46 and 46 which consist of elastic materials, such as rubber | gum, and are arrange | positioned substantially horizontally are fixed to the outer peripheral side of each kneading vertical rod 31 and 31, and the net 37 is fixed to a shaping ring. (Fig. 7). In this case, at the time of kneading, the shaping ring 46 comes into contact with the pile hole wall 22 and acts on the kneading of the pile hole wall 22 together with the net 37 and the kneading vertical rod 31 to increase the kneading efficiency (FIG. 7A (B)). In the hollow part 18 of the hollow pile 17, the shaping ring 46 contacts the inner wall of the hollow pile 17 and is bent and folded (FIG. 7B).
[0055]
In this case, the shaping ring 46 is arranged horizontally, but can also be arranged obliquely (not shown). Further, the shaping ring 46 is fixed to the outer periphery of the kneading vertical rods 31 and 31, but can also be fixed to the inner periphery, and can be formed on substantially the same circle as the kneading vertical rods 31 and 31. (Not shown). Further, the shaping ring 46 is formed as an integral circle, but it is formed into a partial circle shape (a quarter circle in the case of FIG. 7) that connects between the adjacent kneading vertical rods 31 and 31, and both ends of the shaping ring 46 are kneaded at both ends. It can also be fixed to the attached vertical rods 31, 31 (not shown).
[0056]
[Example 3]
Next, another embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the kneading vertical rods 31 and 31 are fixed to the spiral blade 2, but the kneading vertical rods 31 and 31 are fixed to the hollow circular tube 1 of the rod body 5.
[0057]
The rod body 5 is formed on the outer periphery of the hollow circular tube 1 by spirally winding the spiral blade 2 over almost the entire length. On the outer peripheral side of the spiral wing 2 of the rod body 5, kneading vertical rods 31 are arranged vertically. The kneading longitudinal rods are arranged in an annular shape at regular intervals in a plan view every four.
[0058]
Here, four kneading vertical rods 31 and 31 are provided. However, as in the case of the second embodiment, if there are a plurality of kneading rods, two, three or five or more can be used. There is no limit.
[0059]
The upper end portion 32 of the kneading vertical rod 31 is rotatably connected to the tip 38a of the upper support member 38 fixed to the outer surface of the hollow circular tube 1 of the rod body 5, and the lower end portion of the kneading vertical rod 31 is The tip of the lower support member 39 fixed to the outer surface of the hollow circular tube 1 is rotatably connected. The upper support member 38 is inclined and fixed with the tip 38a side lowered, and the lower support member 39 is inclined and fixed with the tip 39a side raised.
[0060]
The upper and lower support members 38 and 39 are configured by connecting a base end portion 40 fixed to the circular tube 1 and a tip end portion 41 attached to the kneaded vertical member 31 with a spring spring 44 (FIG. 5C). .
[0061]
At the connecting portion between the upper support member 38 and the kneading vertical rod 31, the upper support member 38 and the kneaded vertical rod 31 are in a state in which the kneading vertical rod 31 is open (a state radially away from the hollow circular tube 1). Are formed on the side of the kneading case 31 so as to maintain a predetermined angle θ, and the upper support member 38 is formed with a recess 43 that fits with the protrusion 42 (FIG. 5A). b)).
[0062]
Subsequently, a net 37 having flexibility similar to that of the second embodiment is stretched between the adjacent kneading longitudinal bars 31 and 31 to constitute the pile hole excavating rod 10 (FIGS. 4A and 4B). ).
[0063]
The kneading vertical rods 31, 31 are formed at least on the rod body 5 directly above the excavation head 15 (not shown), as in the second embodiment.
[0064]
The use of the pile hole excavating rod 10 of this embodiment is the same as that of the second embodiment.
[0065]
In the above embodiment, the kneading rod 31 is formed in a rod shape with a circular cross section, but can also be formed in a plate shape (not shown). In this case, a cross-sectional shape along the outer periphery 3 of the spiral blade 2 may be used.
[0066]
Further, in the above-described embodiment, the upper support member 38 is formed to be inclined with the tip 38a side of the upper support member 38 lowered, and the tip 39a side of the lower support member 39 is raised, so that the vertical direction (vertical direction) and the circumferential direction are formed. Although it is easy to fold to either side (lateral direction), the upper and lower support members 38 and 39 can be formed in a substantially horizontal direction. Alternatively, the upper support member 38 can be formed with the tip 38a side raised, and the lower support member 39 with the tip 39a side lowered (both not shown).
[0067]
Moreover, in the said Example, the kneading ring 46 can also be fixed between the kneading vertical rods 31 and 31 similarly to Example 2 (not shown, refer FIG. 7).
[0068]
【The invention's effect】
Pile hole drilling rods have a spiral band for kneading on the outer periphery of the spiral wing, or a kneading vertical rod attached to the rod body, so the spiral wing is removed from the rod body at the part where the kneading means are attached. The spiral wings can be formed continuously over almost the entire length without any interruption, so that there is an effect that the pile hole wall can be kneaded without impairing the earthing action of the spiral wings.
[0069]
Further, since the kneading means is configured to have an elastic material, it is deformed and folded in the hollow pile, so that when the excavation hole having the outer diameter of the hollow pile or more is formed, the kneading means is in the kneading position. The pile hole wall can be kneaded with certainty. By kneading the pile hole walls, the amount of soil removed is reduced, and the hollow piles can be easily laid.
[0070]
In addition, since a spiral band made of an elastic material is used, or the kneaded warp can be projected and retracted radially with respect to the rod body, the spiral band or the closed kneaded vertical can easily be placed in the hollow portion of the hollow pile. In addition to being able to be accommodated, the spiral band or the open kneading girder has an effect of reliably kneading the pile hole wall, shortening the construction interval and improving the construction efficiency.
[0071]
In addition, the spiral wing is formed from an elastic material, and the kneading warp is formed from a material having flexibility, or the outer surface of a hard material is formed by covering with an elastic material, or a kneading net is provided. Therefore, even if these kneading means are in strong contact with the hollow pile during use, there is no possibility of damaging the hollow pile or the kneading means. Further, since special processing such as rust prevention is not required, it can be manufactured or repaired at a lower cost than when formed from a metal material.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a pile hole excavation rod according to Embodiment 1 of the present invention, in which (a) is a longitudinal sectional view and (b) is a partial transverse sectional view.
FIG. 2 is another pile hole excavation rod, in which (a) is a longitudinal sectional view and (b) is a partial transverse sectional view.
FIGS. 3A and 3B are pile hole excavation rods according to Embodiment 2 of the present invention, in which FIG. 3A is a partial front view in which a net is omitted, FIG. 3B is a longitudinal cross-sectional view in a state where a kneading longitudinal rod is opened, FIG. FIG. 2 is a longitudinal sectional view showing a state in which a kneading vertical gutter is closed.
4A and 4B are other pile hole excavation rods, in which FIG. 4A is a partial front view in which a net is omitted, and FIG. 4B is a cross-sectional view taken along line AA in FIG.
5A is an enlarged view of a portion X in FIG. 4A, FIG. 5B is an enlarged sectional view taken along line AA in FIG. 4A, and FIG. 5C is an enlarged view of a Y portion in FIG. It is.
FIGS. 6A to 6E are longitudinal sectional views of a construction example using the pile hole excavation rod of Example 1 of the present invention.
7A is a front view, FIG. 7B is a partial cross-sectional view in a kneaded state, and FIG. 7C is a partial cross-sectional view in a state of being housed in a hollow pile.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hollow circular pipe 2 Spiral wing 3 Outer periphery of spiral wing 5 Rod body 7 Spiral belt 8 Inner circumference (spiral belt)
9 Outer circumference (spiral belt)
10 Pile hole drilling rod 12 Spring spring 15 Drilling head 17 Hollow pile 18 Hollow part (hollow pile)
19 Lower end (hollow pile)
21 Pile hole 22 Hole wall (pile hole)
23 Kneading section (pile hole)
24 Shaft (Pile hole)
25 Expanded bottom (pile hole)
27 Kneading plate 31 Kneading vertical rod 34 Spring spring 37 Net 38 Upper support material 39 Lower support material 40 Base end (upper and lower support material)
41 Tip (up / down support)
42 Convex (upper / lower support material)
43 Concave (upper and lower support material)
44 Spring spring 46 Shaping ring

Claims (9)

A drill rod for use in medium-drilling method, in drill rod having a rod body to form a helical blade which can be accommodated in the hollow portion of the hollow pile around the hollow round tube, located on the outer peripheral side of the front Symbol spiral wrap A kneading gutter capable of kneading the pile hole wall is arranged vertically, and the kneading gutter is provided on the rod body with a support material to constitute a kneading means. A pile hole excavating rod, which is formed by being deformed by deformation so as to be accommodated in a hollow portion of the hollow pile. An excavation rod for use in an intermediate excavation method, the excavation rod having a rod body in which a spiral wing that can be accommodated in a hollow portion of a hollow pile is formed around a hollow circular pipe, the spiral along the outer periphery of the spiral wing A pile hole excavating rod, wherein a spiral band made of an elastic material is attached continuously to a wing, and the outer diameter of the spiral band is formed larger than the outer diameter of the hollow pile. The pile hole excavation rod according to claim 2, wherein a spring material capable of biasing the spiral band into a shape continuous with the outer periphery of the spiral blade is interposed between the outer periphery of the spiral blade and the spiral band. The pile hole excavation rod according to claim 2, wherein a kneading surface is formed on the outer peripheral edge of the spiral band. An excavation rod for use in an intermediate excavation method, the excavation rod having a rod body in which a spiral wing that can be accommodated in a hollow portion of a hollow pile is formed around a hollow circular pipe, and a plurality of drills are provided along an outer periphery of the spiral wing. The vertical gutter is arranged in a plane circle in the vertical direction, and the kneaded vertical gutter can be projected and retracted radially with respect to the rod main body, and is attached to the rod main body in a state of being biased to the protruding state. A pile hole excavation rod characterized by having a shape that can be accommodated in a hollow portion of the hollow pile in a closed state. The pile hole excavation rod according to claim 5, wherein a kneading net that covers the outer periphery of the spiral blade is attached between the kneading warps. 6. The pile hole excavation rod according to claim 5, wherein the kneading warp is formed from a material having flexibility, or is formed by coating an outer surface of a hard material with an elastic material. The pile hole excavation rod according to claim 5, wherein the kneaded vertical rods are connected by a shaping ring formed of a material having elasticity. The pile hole excavation rod according to any one of claims 1, 2, and 5, wherein the kneading means, the spiral band, or the kneading vertical rod is formed at least directly on the excavation head of the rod body.

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