JP6044351B2 - Solidified body construction method, steel pipe pile embedding method using the same, and steel pipe pile embedding structure - Google Patents

Description

  The present invention mainly relates to a solidified body forming method applied when embedding a steel pipe pile having a small pile diameter in the ground, a steel pipe pile embedding method using the solidified body, and a steel pipe pile embedding structure.

  From the standpoint of the support mechanism, the pile foundation for supporting the structure consists of a support pile that secures the support force by penetrating the lower end into a good quality support layer, and the surrounding ground when there is no good quality support layer. Friction piles that secure supporting force by friction are broadly classified, but from the viewpoint of construction method, they are classified as driven piles, embedded piles, cast-in-place piles, etc., and from the viewpoint of pile diameter, φ300 mm or less A pile method called a micropile method using embedded piles or driven piles is known.

  Since the micropile method can be implemented with relatively small construction machines, it has proven itself as an effective method when it is not possible to secure sufficient construction space in confined areas, places with limited heads, mountains, slopes, etc. is there.

  When using steel pipe piles as embedded piles in the micropile method, first form a drilling hole in the ground, then build a steel pipe pile in the drilling hole, and place a grout material below and around the steel pipe pile. Fill.

  In this way, the filled grout material is solidified below the steel pipe pile to transmit the axial force of the steel pipe pile to the ground in a dispersed state, and is solidified around the steel pipe pile to form the steel pipe pile. It plays the role of transmitting the horizontal force and the frictional force along the peripheral surface of the steel pipe pile with the surrounding ground, and thus the supporting force of the steel pipe pile is sufficiently secured.

JP 2001-81770 A

  Here, if the solidified body located near the lower end of the steel pipe pile is made larger than the outer diameter of the steel pipe pile, the axial force of the steel pipe pile is transmitted to the ground in a further load-distributed form. The tip supporting force can be increased.

  However, when the diameter of the drilling hole is increased, the excavated earth and sand remains on the bottom surface of the drilling hole, and the grout material is solidified in a state where the excavated earth and sand is mixed with the grout material. The strength could not be expected, and as a result, there was a problem that the tip bearing capacity of the steel pipe pile was insufficient.

  Such a problem can be solved by discharging the excavated sediment generated by the expansion of the diameter from the excavation hole. However, since the excavation work requires time and effort, an alternative construction method excellent in economy has been desired.

  The present invention has been made in consideration of the above-mentioned circumstances, and a method for producing a solidified body capable of preventing the strength of the solidified body from being reduced due to mixing of excavated earth and sand generated by diameter expansion into the solidified body, and It aims at providing the embedding method of a steel pipe pile using it, and the embedding structure of a steel pipe pile.

In order to achieve the above object, the solidified body forming method according to the present invention, as described in claim 1, forms the excavation hole vertically or obliquely downward in the ground,
Of the hole wall of the excavation hole, the hole wall near the bottom is cut to form an expanded region,
After forming or forming the enlarged diameter region, the cutting soil generated by the formation of the enlarged diameter region is deposited on the bottom surface of the excavation hole to form a deposition layer,
A first solidified body is formed by filling the deposited layer with a first solidifying material and solidifying the first solidified material,
A second solidified body is formed in a form laminated on the first solidified body by putting a second solidified material into the space from the top edge of the deposited layer to the upper edge of the enlarged diameter region and solidifying. To do.

  In the solidified material forming method according to the present invention, the second solidified material is mortar or concrete to which fibers are added.

  Further, in the solidified body forming method according to the present invention, the expanded diameter region is formed so that the non-expanded region is left immediately above the bottom surface of the excavation hole, and the cutting soil is dropped into the non-expanded region. To form the deposited layer.

Further, according to the method of embedding a steel pipe pile according to the present invention, a drilling hole is formed in the ground and a solidified body is formed in the vicinity of the bottom surface of the drilling hole. In the method of embedding a steel pipe pile, the steel pipe pile is built in the excavation hole so as to be in contact or penetrated.
The solidified body is constituted by a first solidified body and a second solidified body stacked on the first solidified body, and the first solidified body and the second solidified body are claimed in claims 1 to 2. The solidified body is formed according to the method for forming a solidified body according to any one of 3 above.

Further, the method for embedding a steel pipe pile according to the present invention forms the excavation hole while protecting the hole wall by the casing,
After forming the excavation hole and before the formation of the enlarged diameter region, the casing is raised to the vicinity of the upper edge of the section where the enlarged diameter region is formed,
After the formation of the first solidified body and the second solidified body, the steel pipe pile is installed in the excavation hole, the casing is pulled out, and the peripheral surface of the steel pipe pile and the hole wall of the excavation hole The grout material is filled in between.

In addition, the steel pipe pile embedding structure according to the present invention has a solidified body formed in the vicinity of the bottom surface of the excavation hole formed in the ground and a lower end abutting or penetrating the solidified body as described in claim 6. In the embedded structure of a steel pipe pile consisting of a steel pipe pile built in the excavation hole,
A first solidified body obtained by cutting the hole wall near the bottom surface of the excavation hole and filling the solidified material with the first solidified material in the cut soil deposited on the bottom surface; And a second solidified body in which a second solidified material is put into a diameter-enlarged region formed by cutting the hole wall so as to be laminated on the first solidified body and solidified. It is.

[First invention]
In the method for forming a solidified body according to the first aspect of the present invention, when forming a diameter-enlarged region by cutting a hole wall in the vicinity of the bottom surface of the hole wall of the excavation hole formed in the ground, formation of the diameter-enlarged region The cutting soil generated by the above is not drained, but is deposited on the bottom of the excavation hole to form a deposited layer.

  Next, the first solidified body having the same strength as the surrounding ground is formed in the deepest part of the excavation hole by filling the deposited layer with the first solidifying material and solidifying.

  On the other hand, the cutting earth and sand generated by the formation of the enlarged diameter region is deposited on the bottom surface of the excavation hole as described above to form a deposition layer, and the cutting layer is cut between the top edge of the deposition layer and the upper edge of the enlarged diameter region. Since a non-depositing space in which no earth and sand are present is formed, a second solidified body is formed in a form laminated on the first solidified body by putting the second solidifying material into the non-depositing space and solidifying it. To do.

  In this case, the second solidified body is in a state in which the load dispersion action is high due to the diameter expansion, and since the second solidified body is composed of only the second solidified material without including the cutting earth and sand, the state is highly reliable in terms of strength and other quality. It is built with.

  Therefore, coupled with the fact that the first solidified body located immediately below has the same strength as the surrounding ground, it is possible to greatly increase the allowable value of the vertical load acting on the upper surface of the second solidified body. Become.

  The diameter-expanded region is, for example, attached to the tip of a rod with a blade-shaped excavating blade configured to be openable and closable, and the rod is moved around the material axis with the opening angle of the excavating blade adjusted appropriately. It can be formed by rotating.

  For example, when embedding a steel pipe pile in the ground, the wing expansion bit can be diverted to the one used when creating a rooted bulb with a diameter expanded near its lower end. The wing bit used in the present invention is used in a hollow excavation hole, whereas the cut earth and sand and the solidified material are agitated and mixed, thereby forming a rooted bulb as a soil cement. Therefore, there is no risk that the excavation blade cannot be opened and closed due to earth and sand, and a relatively simple structure is sufficient.

  The first solidifying material may be any material as long as it is a material that can be filled in a deposited layer formed by depositing cutting earth and sand, and can be composed of, for example, cement milk or mortar. Moreover, as a method of filling the first solidifying material, permeation or stirring and mixing may be used. Incidentally, when the first solidifying material is cement milk, the first solidified body is a so-called soil cement.

  On the other hand, since the 2nd solidification material is thrown into the non-deposition space which is a cavity, it is possible to use mortar and concrete.

  Here, it is possible to adopt a configuration in which the above-mentioned second solidified material is mortar or concrete to which fibers are added. In such a case, the second solidified body is fiber-reinforced mortar or fiber-reinforced concrete. Therefore, further improvement in strength can be expected.

  The diameter expansion region is formed by cutting the hole wall in the vicinity of the bottom surface of the hole wall of the excavation hole, but it is not always necessary to set the diameter expansion region directly above the bottom surface, and the non-expansion region is directly above the bottom surface of the excavation hole. It is also possible to form the deposited layer by forming the enlarged-diameter region so as to remain, and dropping the cut earth and sand into the non-expanded region.

  In such a case, since a part of the cut space is finally occupied by the deposited layer, there is no concern that the cutting work will be wasted, and it is possible to use all the cut space as an enlarged diameter region. Become.

  Most of the dropping of the cut soil into the non-expanded region is performed by natural fall, but there is a concern that the annular bottom of the expanded region connected to the non-expanded region becomes a paragraph and the cut soil remains on the annular bottom. If there is, the blade spread bit is rotated in a state where the opening angle of the excavation blade is appropriately adjusted, so that the cut sediment is removed from the annular bottom portion and dropped into the non-expanded region.

  In the case of forming the enlarged diameter region so that the non-expanded region is left immediately above the bottom surface of the excavation hole, the first solidified body is formed in the non-expanded region, so the first formed in the expanded diameter region. The outer diameter is smaller than the solidified body of No. 2. For this reason, for example, when the excavation hole is formed, the periphery thereof is disturbed, and the ground strength may be insufficient in a cylindrical region extending around the non-expanded region.

  For such a situation, the first solidified material is pressurized and injected into the deposition layer at a sufficient pressure to expand the permeation range of the solidified material to the outside of the non-expanded region, and thus the cylinder described above. A measure to reinforce the region is conceivable, but instead, after the first solidifying material is filled and before the solidifying material is solidified, the front end faces the vicinity of the top end of the deposited layer. Alternatively, the loading rod is disposed so that the tip is positioned below the top end of the deposited layer, and the loading rod is advanced along the material axis direction in the vicinity of the center of the deposited layer. A method of pressurizing the deposited layer with a loading means arranged at the tip of the rod can be employed.

  Even in such a configuration, the above-described cylindrical region is reinforced because the first solidified material filled in the deposited layer penetrates and diffuses to the surrounding ground beyond the non-expanded region, similarly to the method by pressure injection. In addition, it is possible to cope with simple equipment without introducing equipment for injecting the first solidified material under pressure.

  Regarding the relative positional relationship between the deposited layer and the loading rod, the tip of the loading rod does not necessarily need to be positioned below the top of the deposited layer, as long as the deposited layer is pressurized by the forward operation of the loaded rod. The tip of the loading rod may be separated from the top end of the deposited layer.

[Second invention]
The above-described solidified body forming method according to the first invention can be applied to all cases where the expanded solidified body is to be formed in the ground with high quality. For example, the solidified body can be independently used as a basic form of the upper structure. If a foundation is desirable but its adoption is difficult due to insufficient ground strength, it can be applied to the formation of a solidified body directly under the independent foundation. In constructing a solidified body in the vicinity of the bottom surface of the hole and constructing the steel pipe pile in the excavation hole so that the lower end abuts or penetrates the solidified body, the solidified body is divided into the first solidified body and the first solidified body. If it comprises the second solidified body laminated on the solidified body, and the first solidified body and the second solidified body are formed according to the above-described forming method (second invention), the steel pipe A solidified body with an outer diameter larger than that of the pile is highly reliable. As the second solidified body is created in the state, and the first solidified body just below it is constructed with the same strength as the surrounding ground, it is ensured that the axial force of the steel pipe pile is in a load-distributed form. Thus, the tip supporting force of the steel pipe pile is greatly improved.

  The formation method of the drilling hole is arbitrary, but when the drilling hole is formed while protecting the hole wall by the casing, the enlarged diameter region is formed after the drilling hole is formed and before the enlarged diameter region is formed. After raising the casing to the upper edge of the section to be constructed, and forming the first solidified body and the second solidified body, building the steel pipe pile into the excavation hole, pulling out the casing, and the peripheral surface of the steel pipe pile and the excavation hole What is necessary is just to make it fill with the grout material between these hole walls.

  The order in which the steel pipe pile is installed in the excavation hole, the casing is pulled out and the grout material is filled between the peripheral surface of the steel pipe pile and the hole wall of the excavation hole is arbitrary, and the steel pipe pile is removed from the excavation hole. After installing the steel pipe pile, the steel pipe pile is built after the grout material is filled in the excavation hole, and then the casing is pulled out and removed. Is possible.

[Third invention]
The embedded structure of the steel pipe pile according to the third invention is a solidified body formed in the vicinity of the bottom surface of the excavation hole formed in the ground, and the above-mentioned excavation hole so that the lower end abuts or penetrates the solidified body. The solidified body is formed by cutting the hole wall in the vicinity of the bottom surface among the hole walls of the excavation hole to form the first solidified material on the cutting soil deposited on the bottom surface. A first solidified body that is filled and solidified, and a second solidified material is injected into the diameter-enlarged region formed by cutting the hole wall so as to be laminated on the first solidified body. And a second solidified body.

  In this way, a solidified body having an outer diameter larger than that of the steel pipe pile is formed as a second solidified body in a state of high quality reliability, and the first solidified body immediately below the solidified body has the same strength as the surrounding ground. Therefore, the axial force of the steel pipe pile is reliably transmitted to the ground in a load-distributed form, and thus the tip support force of the steel pipe pile is greatly improved.

  As with the first invention, the first solidifying material may be any material that can be filled into the cutting earth and sand, for example, it can be composed of cement milk or mortar. Similar to the first invention, mortar or concrete can be used because it is put into the expanded diameter region which is a cavity. Incidentally, when the first solidifying material is cement milk, the first solidified body is a so-called soil cement.

  Here, it is possible to adopt a configuration in which the above-mentioned second solidified material is mortar or concrete to which fibers are added. In such a case, the second solidified body is fiber-reinforced mortar or fiber-reinforced concrete. Therefore, further improvement in strength can be expected.

The flowchart which showed the implementation procedure of the formation method of the solidified body which concerns on this embodiment, and the embedding method of the steel pipe pile using the same. The vertical sectional view explaining the implementation procedure of this embodiment. The vertical sectional view which continued the implementation procedure of this embodiment. The vertical sectional view which continued the implementation procedure of this embodiment. The vertical sectional view which continued the implementation procedure of this embodiment. The vertical sectional view which continued the implementation procedure of this embodiment. The vertical sectional view which showed the implementation procedure of the formation method of the solidified body which concerns on a modification. The vertical sectional view which showed the implementation procedure of the formation method of the solidified body which concerns on another modification.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a solidified body forming method, a steel pipe pile embedding method using the same, and a steel pipe pile embedding structure according to the present invention will be described below with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

  FIG. 1 is a flowchart showing a method for forming a solidified body and a method for embedding a steel pipe pile using the same according to the present embodiment. As shown in the figure, in order to embed a steel pipe pile in the ground using the steel pipe pile embedding method according to this embodiment, first, as shown in FIG. Meanwhile, the drilling hole 4 is formed in the ground 3 with the boring rod 2 built in the casing (step 101).

  Next, as shown in FIG. 2 (b), prior to the formation of the enlarged-diameter region 32, the casing 1 is raised to the vicinity of the upper edge of the zone where the enlarged-diameter region is formed, and the boring rod 2 is pulled up and removed (step). 102).

  Next, as shown in FIG. 3A, the cutting rod 6 for expanding the diameter is built in the casing 1 (step 103).

  The diameter expansion cutting rod 6 is composed of a hollow rod 7 that can be moved forward and backward along the material axis direction and rotatably about the material axis, and a blade expansion bit 8 attached to the tip of the hollow rod, The blade expansion bit 8 is constituted by a bowl-shaped excavation blade that can be freely opened and closed.

  In order to install the expanding rod 6 in the casing 1, the expanding bit is folded in advance so that the expanding bit 8 does not interfere with the inner surface of the casing 1, and the expanding rod 6 is expanded in this state. After being lowered in the casing 1, it may be deployed at a position protruding from the lower end of the casing 1.

  Next, the region extending just above the bottom surface of the excavation hole 4 is not expanded but left as a non-expanded region 31, and the hole wall above is cut by the blade 8 to form the expanded region 32. The earth and sand 33 generated by the cutting is not discharged, but is dropped into the non-diameter expanded region 31 to form a deposited layer 34 (step 104).

  In forming the diameter expansion region 32, the opening angle of the bowl-shaped excavation blades constituting the blade expansion bit 8 is appropriately adjusted, and the hollow rod 7 may be rotated around the material axis.

  Next, as shown in FIG. 4, the first solidified body 41 having the same strength as the surrounding ground is obtained by filling the sedimentary layer 34 with cement milk as the first solidifying material and solidifying the cement milk. It is formed in the deepest part of the excavation hole 4 (step 105).

  In order to fill the sedimentation layer 34 with the cement milk, the pumping pump (not shown) connected to the hollow rod 7 is operated to supply cement milk into the hollow rod, and this is supplied to the wing expansion bit 8. What is necessary is just to make it discharge from the provided discharge opening 42. FIG.

  On the other hand, the cut earth and sand 33 generated by the formation of the enlarged diameter region 32 is deposited on the bottom surface of the excavation hole 4 as described above to become a deposited layer 34, and the top edge of the deposited layer and the upper edge of the enlarged diameter region 32. In the meantime, a non-deposited space in which the cutting earth and sand 33 do not exist is formed, so that the mortar 51 as the second solidified material is discharged from the discharge port 42 of the wing expansion bit 8 as shown in FIG. Further, by putting this into the non-deposition space described above and solidifying it, the second solidified body 52 is formed in the form of being laminated on the first solidified body 41 as shown in FIG. 106).

  The non-deposition space described above coincides with the enlarged diameter region 32 when the top end of the deposited layer 34 coincides with the lower edge of the enlarged diameter region 32.

  Next, as shown in FIG. 6 (a), the steel pipe pile 61 is built in the casing 1 (step 107), and then the peripheral surface of the steel pipe pile 61 and the hole wall of the excavation hole 4 are pulled out while the casing 1 is pulled out. By filling the grout material 62 between them (step 108), the embedding of the steel pipe pile 61 in the ground 3 is completed.

  FIG. 6 (b) shows an embedded structure of the steel pipe pile 61 constructed in the above procedure, and the embedded structure of the steel pipe pile 61 is located near the bottom surface of the excavation hole 4 formed in the ground 3. The first solidified body 41 formed, the second solidified body 52 stacked on the first solidified body 41, and the steel pipe pile built in the excavation hole 4 so that the lower end is in contact with the second solidified body 61, and the first solidified body 41 is formed as a first solidified material on the cut soil deposited on the bottom surface by cutting the hole wall in the vicinity of the bottom surface of the hole wall of the excavation hole 4. The cement milk is filled and solidified, and the second solidified body 52 is secondly formed in the enlarged diameter region 32 formed by cutting the hole wall so as to be laminated on the first solidified body. The mortar as a solidifying material is charged and solidified.

  As described above, according to the method for forming a solidified body according to the present embodiment, the second solidified body 52 is formed in the form of being stacked on the first solidified body 41, but the second solidified body is formed. Is formed in a state in which the load dispersing action is high due to the diameter expansion, and the mortar 51 alone does not include the cutting earth and sand 33, and thus is highly reliable in terms of strength and other quality.

  Therefore, coupled with the fact that the first solidified body 41 located immediately below has the same strength as the surrounding ground, the allowable value of the vertical load acting on the upper surface of the second solidified body 52 can be greatly increased. It becomes possible.

  Moreover, according to the embedding method of a steel pipe pile and the embedding structure of a steel pipe pile according to the present embodiment, a solidified body having an outer diameter larger than that of the steel pipe pile 61 is formed as the second solidified body 52 with high quality reliability. In addition, since the first solidified body 41 immediately below is formed with the same strength as the surrounding ground, the axial force of the steel pipe pile 61 is reliably transmitted to the ground 3 in a load-distributed form, Thus, the tip support force of the steel pipe pile 61 is greatly improved.

  In this embodiment, the drilling hole 4 is formed by the boring rod 2 and the diameter-enlarged region 32 is formed by the diameter-enlarging cutting rod 6. In the case where the hole 4 can be formed, the work of replacing the boring rod 2 with the diameter-enlarging cutting rod 6 becomes unnecessary.

  Further, in the present embodiment, cement milk is filled in the deposited layer 34 made of the cut earth and sand 33 dropped into the non-expanded region 31, and this is simply solidified to form the first solidified body 41. Before the cement milk is solidified, a boring rod 73 is built in the casing 1 in place of the diameter-expanding cutting rod 6 as shown in FIG. 7 (a), and the non-core cutting attached to the tip opening of the boring rod. By discharging cement milk from the discharge hole of the bit 71, the cement milk is filled in the deposited layer 34 in the non-expanded region 31. Then, a boring rod 73 as a loading rod has a tip at the top end of the deposited layer 34. After being positioned so as to be positioned downward, the boring rod is advanced along the material axis direction in the vicinity of the center of the deposition layer 34, thereby loading the loading means and The deposited layer 34 by non-core cutting bit 71 of Te may be pressurized.

  In such a configuration, the cement milk filled in the deposition layer 34 permeates and diffuses to the surrounding expansion region 72 beyond the non-diameter expansion region 31 by the pressurizing action by the non-core cutting bit 71.

  Therefore, for example, when the excavation hole 4 is formed, the vicinity of the hole wall is disturbed, so that the cylindrical region extending outside the non-expanded region 31, that is, between the non-expanded region 31 and the expanded region 72. Even if there is a concern that the ground strength is insufficient in the cylindrical region that spreads out, the cemented milk penetrates and diffuses beyond the non-expanded region 31 to the surrounding expanded region 72, so that the above-described cylindrical shape is obtained. The area can be reinforced.

  After filling the cement milk deposition layer 34 and pressurizing with the non-core cutting bit 71, as in the above-described embodiment, the mortar 51 is appropriately put into the enlarged diameter region 32 as shown in FIG. Then, the second solidified body 52 may be formed by solidifying the mortar 51.

  Although not specifically mentioned in the present embodiment, the second solidified body can be obtained by replacing the mortar 51 with a mortar to which fibers are added as the second solidified material in the expanded region 32. Will be comprised with a fiber reinforced mortar, and it will become possible to further raise the front-end | tip support force of the steel pipe pile 61. FIG.

  Further, in this embodiment, the region extending just above the bottom surface of the excavation hole 4 is left as the non-expanded region 31 without being expanded, and the expanded wall 32 is formed by cutting the hole wall above. However, instead of this, as shown in FIG. 8 (a), the non-diameter expanded area may not be left, and the area extending just above the bottom surface of the excavation hole 4 may be used as the enlarged diameter area 81.

  In this case, since a part of the cut space eventually accumulates the cutting earth and sand and becomes a deposited layer, it becomes impossible to use all the cut space as a diameter expansion region, and the cutting work is wasted. However, the first solidified body 82 is formed by depositing the cutting earth and sand generated by the formation of the enlarged diameter region 81 on the bottom surface of the excavation hole 4 and filling the deposited layer with cement milk to be solidified. At the same time, the second solidified body 83 can be formed by putting mortar into the remaining enlarged diameter region 81 and solidifying it, which is the same as the embodiment described above.

  Since the other configurations and the operational effects thereof are the same as those of the above-described embodiment, the detailed description thereof is omitted here. However, in the case where the area extending just above the bottom surface of the excavation hole 4 is the enlarged diameter area 81. For example, by forming cemented milk from a discharge port 42 provided in the blade expansion bit while forming a diameter expansion region 81 with the blade expansion bit 8, the deposited soil is deposited on the bottom surface of the excavation hole. And a process of filling the deposited layer with the first solidifying material at the same time, a so-called stirring and mixing method can be employed. In that case, instead of cement milk, mortar or concrete is used. Or it is also possible to use in the state which added the fiber to them.

  Moreover, in this embodiment, when the steel pipe pile 61 was built, it waited for solidification of the mortar 51, ie, the completion of formation of the 2nd solidified body 52, but the lower end of the steel pipe pile 61 is the 2nd solidified body 52. If it is embedded in the ground 3 so as to penetrate into the ground, the steel pipe pile 61 is built before the mortar 51 is solidified, and the lower end of the steel pile pile 61 is held in a state where the mortar 51 is solidified. That's fine.

DESCRIPTION OF SYMBOLS 1 Casing 3 Ground 4 Excavation hole 5 Expanded area 31 Non-expanded area 32, 81 Expanded area 33 Cutting soil 34 Deposition layer 41, 82 1st solidified body 51 Mortar (2nd solidified material)
52, 83 Second solidified body 61 Steel pipe pile 62 Grout material 71 Non-core cutting bit (loading means)
73 Boring rod (loading rod)

Claims (6)

Forming a borehole in the ground vertically downward or diagonally downward,
Of the hole wall of the excavation hole, the hole wall near the bottom is cut to form an expanded region,
After forming or forming the enlarged diameter region, the cutting soil generated by the formation of the enlarged diameter region is deposited on the bottom surface of the excavation hole to form a deposition layer,
A first solidified body is formed by filling the deposited layer with a first solidifying material and solidifying the first solidified material,
A second solidified body is formed in a form laminated on the first solidified body by putting a second solidified material into the space from the top edge of the deposited layer to the upper edge of the enlarged diameter region and solidifying. A method for producing a solidified body characterized in that: The method for forming a solidified body according to claim 1, wherein the second solidified material is mortar or concrete to which fibers are added. The said enlarged-diameter area | region is formed so that a non-diameter-expanded area | region may be left immediately above the bottom face of the said excavation hole, and the said sediment layer is formed by dropping the said cutting earth and sand into this non-expanded area | region. 3. A method for producing a solidified body according to 2. An embedding of a steel pipe pile that forms a drilling hole in the ground, forms a solidified body near the bottom of the drilling hole, and builds a steel pipe pile in the drilling hole so that the lower end abuts or penetrates into the solidified body In the method
The solidified body is constituted by a first solidified body and a second solidified body stacked on the first solidified body, and the first solidified body and the second solidified body are claimed in claims 1 to 2. A method for embedding a steel pipe pile, wherein the solidified body is formed according to the method for forming a solidified body according to any one of 3 above. Forming the excavation hole while protecting the hole wall by the casing,
After forming the excavation hole and before the formation of the enlarged diameter region, the casing is raised to the vicinity of the upper edge of the section where the enlarged diameter region is formed,
After the formation of the first solidified body and the second solidified body, the steel pipe pile is installed in the excavation hole, the casing is pulled out, and the peripheral surface of the steel pipe pile and the hole wall of the excavation hole The steel pipe pile embedding method according to claim 4, wherein the grout material is filled in between. Embedding a steel pipe pile comprising a solidified body formed near the bottom of a drilling hole formed in the ground and a steel pipe pile built in the drilling hole so that the lower end abuts or penetrates the solidified body. In structure
A first solidified body obtained by cutting the hole wall near the bottom surface of the excavation hole and filling the solidified material with the first solidified material in the cut soil deposited on the bottom surface; And a second solidified body in which the second solidified material is put into a diameter-enlarged region formed by cutting the hole wall so as to be laminated on the first solidified body and solidified. Embedded structure of steel pipe pile characterized by

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