JP4758463B2 - Pile driving method and pile with bag body directly under the structure - Google Patents

Description

  The present invention relates to a pile driving method directly under a structure for improving the proof stress of a foundation of an existing structure and deformation performance during an earthquake, and a pile with a bag used in this method.

  When responding to the increase in the load of the superstructure, loosening of the upper ground due to the installation of a new underground structure directly under the existing structure, or seismic reinforcement including countermeasures for liquefaction, etc. However, the yield strength and deformation performance during earthquakes may be insufficient.

  As a method of reinforcing the existing structure in such a case, there is a method of increasing the pile support on the outside of the existing pile and improving the supporting force, the yield strength and the deformation performance at the time of earthquake. Further, in the method of increasing piles, there is a method of increasing the ground strength directly under the existing structure or directly under the existing pile by improving the ground in the lower and surrounding areas in either case of the pile foundation or the direct foundation. However, in such reinforcement by the ground improvement method, the predetermined performance cannot be satisfied unless the entire area directly under the existing structure or other wide area is improved, resulting in an increase in cost. Therefore, it is possible to easily and surely improve the supporting capacity, proof stress, and deformation performance of the foundation without expanding the area for ground improvement and removing the existing foundation. The following method has been proposed as a cast-in-place pile construction method directly under an existing structure.

  In this method, a through-hole in the vertical direction is formed in an existing structure having an existing pile, and the ground is cut by using the through-hole to make a hole having a diameter larger than that of the through-hole. And it is the construction method which inserts a pile from a through-hole, fills the hole which passed the pile with self-hardening fluids, such as cement milk, mortar, or concrete, and makes it a cast-in-place pile.

  However, in the construction method in which a self-hardening fluid is filled into the hole through the above-mentioned pile to make a cast-in-place pile, the self-hardening fluid penetrates into the natural ground, so there is a risk of creating a gap between the lower surface of the existing foundation and the self-hardening fluid. There is. If this gap occurs, there is a problem that the strength to support the existing structure is insufficient. Further, when the self-hardening fluid is further injected to eliminate the gap, there is a problem that the amount of the self-hardening fluid used increases.

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to easily and reliably improve the supporting force, proof stress, and deformation performance of the foundation with a small injection amount of the self-hardening fluid. It is providing the pile driving method directly under a structure, and the pile with a bag used for this method.

  A first invention for achieving the above object includes a first step of making a hole in a foundation of a structure, a second step of driving a pile into the hole, and a self-hardening fluid in a bag attached around the pile. And a third step of pouring and inflating the bag body upward to bring it into close contact with the lower surface of the foundation. According to the said structure, after making a hole in the foundation of a structure and driving a pile into this hole, the bag body attached to the pile is used to connect the upper end side of the pile and the foundation. Since this bag body swells upward when a self-hardening fluid is poured, the bag body is in close contact with the lower surface of the foundation. When the self-hardening fluid in the bag body is solidified, the pile and the lower surface of the foundation are connected via the self-hardening fluid in the bag body. Therefore, the structure can be supported by a pile driven by punching an existing structure.

  Furthermore, in the third step, the bag body has a surplus portion on the upper side, and the bag body is inflated from below by inflating the bag body from below while leaving the surplus portion, so that the foundation According to the configuration in which the bag is in close contact with the lower surface, the lower portion of the bag body is inflated by the injection of the self-hardening fluid, and the extra portion is provided on the upper side when the ground is pushed. For this reason, when the bag body swells in order from the bottom and reaches the surplus part, the bag body swells upward with the already swelled part as a support and comes into close contact with the lower surface of the foundation of the existing structure.

  Further, according to the configuration in which the upper portion of the bag body expands toward the lower surface of the foundation and also swells around the hole, the bag body is provided not only on the lower surface of the foundation but also on the foundation. Since it swells around the hole and expands, after the self-hardening fluid in the bag is hardened, it becomes not only the vertical support of the foundation but also the horizontal support of the foundation.

  2nd invention is a pile with a bag body provided with a pile, a bag body attached to the perimeter of the pile, and an injection means for pouring a self-hardening fluid into the bag body, the bag body, It is a pile with a bag body attached so that it may have a surplus part in the one end side of the said pile. According to the said structure, when the pile which attached the bag body is driven in the hole of an existing structure, and self-hardening fluid is poured in into the bag body by an injection | pouring means, it will expand | swell in order from the bottom, leaving the upper surplus part.

  Furthermore, according to the configuration in which the bag body is provided with limiting means for limiting the bag body so as to inflate in order toward the surplus portion, by the weight of the self-hardening fluid injected below the bag body, The upper surplus part does not disappear.

  3rd invention is a pile with a bag body provided with a pile, a bag body attached to the perimeter of the pile, and an injection means for pouring a self-hardening fluid into the bag body, The first bag body and the second bag body that are attached in series to the pile, and the injection means includes a first injection means for the first bag body and a second injection means for the second bag body. It is a pile with a bag. According to the above configuration, when the self-hardening fluid is injected into the second bag body from the second injection means and expanded and solidified to support it, and then the first bag body is expanded, the first bag body is directed upward. Inflate.

  4th invention is a pile with a bag body which concerns on 3rd invention to which the said 1st bag body located in the one end side of the said pile is attached so that it may have a surplus part in the said one end side. According to the above configuration, when the first bag body is inflated with the second bag body as a support, the first bag body easily expands upward if there is an excess portion on the upper side.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view showing the structure of a pile with a bag according to the first embodiment of the present invention and the steps of a pile driving method directly under the structure according to the first embodiment of the present invention. It is an expanded sectional view of the A section of FIG.

  The structure of the pile with a bag according to the first embodiment will be described with reference to FIGS. 1 and 2. The pile 1 with a bag body includes a pile body 2, a bag body 3, fixing means 4 at both ends of the bag body, a surplus part 3a of the bag body 3, a limiting means 5 for the surplus part 3a, an injection means 6, When the self-hardening fluid is poured into the bag body 3 by the injection means 6, the bag body 3 swells toward the surplus portion 3a.

  The pile main body 2 is formed in a hollow structure, and an injection port 2a for injecting a self-hardening fluid into the bag body 3 is provided in the hollow interior. In addition, in the hollow interior of the pile body 2, the injection means 6 is disposed in parallel to the axial direction of the pile body 2 from the injection port 2 a. This pile main body 2 is inserted into the ground (underground) 8 through a hole 7a opened in the foundation 7 of the existing structure, and the reinforced portion 9 formed at the lower end 2b of the pile main body 2 is against the ground 8a. Is fixed. The strengthening portion 9 is formed by, for example, injecting a chemical solution. In addition, the pile main body 2 is comprised so that it may become predetermined length by connecting many short piles in series. In the illustrated example, the upper end of the pile body 2 is a short pile to which the bag body 3 is attached.

  The bag body 3 is a nylon-made densely woven cylindrical woven fabric that covers the outer peripheral surface of the upper portion 2 c of the pile body 2 and is attached by a fixing means 4. The bag body 3 is made of nylon, but is not limited to nylon, and is formed of a fiber having a dehydration effect that allows the water of the injected self-hardening fluid to permeate and strength sufficient to hold the injected self-hardening fluid. It only has to be. Therefore, for example, it may be formed of synthetic fibers such as polyethylene and vinylon. Moreover, you may use the cylindrical textile fabric which gave the resin coating instead of weaving densely. In this case, complete watertightness is not required.

  The fixing means 4 at both ends of the bag body fix the bag body 3 to the outer peripheral surface of the pile main body 2 at two places, an upper portion (see FIG. 2) and a lower portion of the cylindrical bag body 3. Further, the fixing means 4 at both ends of the bag body does not leak from the upper part and the lower part of the bag body 3 even when the self-hardening fluid is injected between the outer peripheral surface of the pile body 2 and the cylindrical bag body 3. It is supposed to be fixed as follows. The fixing means 4 is, for example, a steel restraint, but is not limited to this, and any means may be used as long as the bag body 3 can be fixed to the pile body 2 so that the self-hardening fluid does not leak.

  As shown in FIG. 2, the extra portion 3a of the bag body is formed by folding the upper end of the bag body 3 toward the inside of the cylindrical bag body 3, and further folding the upper end of the bag body 3 in a valley. Has been. The excess portion 3a of the bag body 3 is folded by securing a sufficient folding allowance L so as to be in pressure contact with the lower surface 7b of the foundation 7 of the structure after being inflated by injection of a self-hardening fluid (see FIG. 5). ing.

  The limiting means 5 for the surplus portion is provided on the outer peripheral surface of the surplus portion 3 a so as to maintain the folded state of the surplus portion 3 a, and is self-hardening between the bag body 3 and the outer peripheral surface of the pile body 2. When the fluid is injected, the bag body is restricted so that the lower portion and the center portion of the bag body 3 swell while leaving the extra portion 3a. Thereafter, when the bag body 3 swells sequentially toward the surplus portion 3a and the self-hardening fluid starts to enter the surplus portion 3a, the restricting means 5 is broken and dissociated. That is, the restricting means 5 is formed to have such a strength that the self-hardening fluid enters the surplus portion 3a after the lower portion and the central portion of the bag body 3 are inflated, and the surplus portion 3a begins to expand. ing. For example, a tape or string is used as the limiting means 5, and the tape or string is wound around the outer periphery of the extra portion 3 a to maintain the folded state of the extra portion 3 a. Further, the restricting means 5 is not limited to a tape or a string, and may be sewn so as to maintain the folded state of the surplus portion 3a or may be maintained in a folded state with an adhesive.

  The injection means 6 is formed by an injection pipe 6 through which a self-hardening fluid passes, and is fixed to the injection port 2 a through the hollow interior of the pile body 2. The upper part of the injection pipe 6 protrudes from the upper end 2d of the pile body 2 and is connected to a self-hardening fluid supply means (not shown). The injection pipe 6 is formed of, for example, a steel pipe, a tubular pipe, or a rubber pipe. In addition, the injection | pouring means 6 is not limited to what was fixed to the injection inlet 2a through the hollow inside of the pile main body 2. FIG. For example, when the self-hardening fluid injection port is provided in the bag body 3, the injection means 6 is directly connected to the injection port provided in the bag body 3. Thus, the injection | pouring means 6 should just pour a self-hardening fluid between the bag 3 and the outer peripheral surface of the pile main body 2, if a self-hardening fluid is supplied from a supply means.

  Next, the shape of the bag 3 will be described with reference to FIG. As shown in FIG. 12A, the bag body 3 is formed in a different diameter cylindrical shape having an enlarged diameter portion 3b and a reduced diameter portion 3c. When the self-hardening fluid is injected between the outer peripheral surface of the pile body 2 and the bag body 3, the enlarged diameter section 3 b is formed so that the enlarged diameter section 3 b at the center of the bag body 3 expands. It is formed larger than the outer diameter. In addition, the reduced diameter portion 3c has a pile main body 2 so as to maintain sufficient adhesion with the outer peripheral surface of the pile main body 2 so that the self-hardening fluid does not leak out from both ends of the bag 3 when the self-hardening fluid is injected. It is formed to the same extent as the outer diameter. In this way, when the formed bag body 3 is folded, an extra portion 3a is formed like a two-dot chain line.

  Next, different shapes of the bag body 3 will be described. As shown in FIG. 12B, the enlarged diameter portion 3b may be formed in a rectangular shape, or as shown in FIG. 12C, both ends of the enlarged diameter portion 3b may be formed in an arc shape.

  Next, the attachment structure to the pile main body 2 of the bag body 3 is demonstrated based on FIG.1, FIG.2, FIG.12. The pile body 2 is inserted from the reduced diameter portions 3 c at both ends of the bag body 3, and the bag body 3 is positioned at a predetermined position above the pile body 2. The reason for positioning at a predetermined position on the top of the pile body 2 is that the pile with a bag according to the present invention presses the foundation 7 of the structure with the expanded bag 3. The reduced diameter portions 3c at the upper and lower ends of the bag body 3 positioned at a predetermined position are fixed by the fixing means 4 so that the self-hardening fluid does not leak from both ends of the bag body 3 when the self-hardening fluid is poured. . Next, the enlarged diameter portion 3b on the upper side (the base 7 side of the structure) of the bag body 3 is valley-folded toward the inside, and further mountain-folded toward the outside. 3a is formed. When the surplus portion 3a is formed, the restricting means 5 holds the folded state so that the surplus portion 3a is not dissociated.

  The pile driving method of 1st Embodiment which uses this pile 1 with a bag body is demonstrated with FIG. 1, FIG.

  The hole 7a of the diameter which can insert the pile 1 with a bag body in the foundation 7 of a 1st process structure is opened. Holes 7a are opened as many as the number of piles 1 with a bag body is inserted.

  The pile 1 with a bag body is driven into the ground 8 from the second process hole 7a, and the lower end of the pile body 2 is brought into contact with the ground 8a. At this time, it is good to form the reinforcement | strengthening part 9 in the lower end part 2b of the pile main body 2, and to fix it firmly with respect to the ground 8a, and this reinforcement | strengthening part 9 is formed by inject | pouring a chemical | medical solution into the ground 8a. . In addition, the pile 1 with a bag body is formed by connecting a short pile with an appropriate length and finally connecting a short pile with a bag body.

  3rd process 1st step The self-hardening fluid is poured through the injection pipe 6 and the injection port 2a from the supply means (not shown) between the bag body 3 attached around the upper end side of the pile body 2 and the outer peripheral surface of the pile body 2. . When the self-hardening fluid is poured, as shown in FIG. 3, the enlarged diameter portion of the bag body 3 begins to swell evenly toward the drilling surface 8 b of the ground 8 while leaving the extra portion 3 a, and the enlarged diameter portion 3 b. Comes into contact with the drilling surface 8b of the ground 8.

  Second Step Further, when a self-hardening fluid is poured, as shown in FIG. 4, pressure is applied to the inside of the bag body 3, and the enlarged diameter portion of the bag body 3 widens while pressing the drilling surface 8 b. Further, the self-hardening fluid also flows into the surplus portion 3a, the surplus portion 3a starts to gradually expand, and the limiting means 5 is broken and dissociated.

  Third Step Further, when the self-hardening fluid is poured, as shown in FIG. 5, the self-hardening fluid spreads over the surplus portion 3a with the already expanded diameter-expanding portion 3b as a support, and the lower surface 7b of the foundation 7 of the structure. The bag body 3 swells upward so as to be closely attached. As described above, when the injected self-hardening fluid is solidified, the lower surface 7b of the foundation 7 of the structure and the upper portion of the pile body 2 are connected via the self-hardening fluid in the bag body 3. For this reason, a structure can be supported by the pile main body 2.

  As described above, the bag body 3 expands sequentially from the bottom while expanding the drilling surface 8b of the ground 8, and when the surplus portion 3a finally expands, the surplus portion 3a is brought into contact with the lower surface 7b of the foundation 7. It comes to adhere closely. This is applied when the ground 8 is soft and the ground 8 is expanded by the expansion of the bag body 3. When the ground 8 is hard and the ground 8 hardly expands due to the expansion of the bag body 3, the drilling surface 8 b of the ground 8 is made larger than the hole 7 a of the foundation 7 in advance. However, the size of the drilling surface 8b is set to such a size that the bag body 3 can be sequentially expanded from below.

  Moreover, as shown in FIG. 6, while installing the extra scale part 3a beforehand so that it may be located above the lower surface 7b of the foundation 7 of a structure, when the clearance gap between the outer periphery of the pile main body 2 and the hole 7a of the foundation 7 is enlarged. In the third stage, the upper portion of the bag body 3 expands toward the lower surface 7b of the base 7 of the structure, and swells around the hole 7a to expand. Due to the expansion of the bag body 3, the foundation 7 and the pile body 2 are pressed not only in the vertical direction but also in the horizontal direction.

  Next, another example of the limiting means 5 applied to the pile 1 with a bag body and the pile driving method according to the first embodiment will be described. As shown in FIG. 1 and FIG. 2, not only to hold the folded state of the surplus portion 3a as shown in FIG. 1 but also to the bag 3, as shown in FIG. The limiting means 11 may be configured by providing belts 11a to 11f. In this case, when the self-hardening fluid is injected, the belt 11c sequentially dissociates from the belts 11c to 11f and starts to expand from below the bag body 3 (parts of the belts 11c to 11f). Thereafter, the belts 11b and 11a are dissociated in this order, and the surplus portion 3a is finally expanded to press the lower surface 7b of the foundation 7 of the structure.

  Moreover, instead of the limiting means 5 and 11 of the type wound around the outer peripheral surface of the bag body 3 like the piles with a bag body 1 and 10 shown in FIGS. 1, 2 and 7, the limiting means 12 is shown in FIG. As shown, the extra portion 3a is lifted by the belt 12 provided in the bag body 3, and the extra portion 3a is pulled upward so as to maintain the folded state of the extra portion 3a. Good. In this case, the lower end of the belt 12 is provided at the lower portion of the extra portion 3a, and the upper end of the belt 12 is fixed to the inner side of the upper end of the pile body 2 so as to pull the extra portion 3a. The belt 12 is formed to have such a strength that the self-hardening fluid enters the surplus portion 3a and breaks and dissociates when the surplus portion 3a starts to expand.

  Furthermore, instead of the limiting means 5 and 11 of the type wound around the outer peripheral surface of the bag body 3, like the piles with bag body 1 and 10 shown in FIGS. As shown, the belt 13 provided inside the bag body 3 may be constructed by pulling up the excess portion 3a.

  Next, the structure of the bag-attached pile 21 according to the second embodiment will be described with reference to FIG. FIG. 10: is a fragmentary sectional view which shows the structure of the pile with a bag which concerns on 2nd Embodiment of this invention, and the process of the pile driving method directly under the structure which concerns on 2nd Embodiment of this invention.

  The pile 21 with a bag body with respect to the pile main body 22, the 1st bag body 23a, the 2nd bag body 23b, the fixing means 25-27, the surplus part 23c of the 1st bag body 23, and the surplus part 23c A limiting means 28 and injection means 29 and 30 are provided. The fixing means 25 and 27 and the limiting means 28 are the same as the fixing means 4 and the limiting means 5 of the first embodiment shown in FIG.

  The pile main body 22 is different from the pile main body 2 of the first embodiment in that the first injection port 22a and the second injection port 22b are provided, but the other points are the same.

  As shown in FIG. 13 (a), the first bag body 23a and the second bag body 23b are integrally formed cylindrical fabrics, and the first bag body 23a and the second bag body 23b are joined together. The part is reduced in diameter. Moreover, the 1st bag body 23a and the 2nd bag body 23b are provided with the enlarged diameter part in which the self-hardening fluid inject | poured together accumulates. The material of the first bag body 23a and the second bag body 23b is the same as that of the bag body 3 of the first embodiment. In addition, the 1st bag body 23a and the 2nd bag body 23b are not limited to the thing of the shape shown to Fig.13 (a), The shape shown to FIG.13 (b) and FIG.13 (c) may be sufficient. In addition, the first bag body 23a and the second bag body 23b may be separately formed tubular fabrics.

  The fixing means 26 is provided in a reduced diameter portion 23d, which is a joint portion between the upper first bag body 23a and the lower second bag body 23b, and is self-hardened injected from the second injection means 30 into the second bag body 23b. The fluid is fixed so as not to advance toward the first bag body 23a. This fixing means 26 is the same as the fixing means 4 of the first embodiment.

  The extra portion 23c of the bag body is formed on the upper portion of the first bag body 23a, and the other points are the same as the extra portion 3a of the first embodiment. In addition, since the 1st bag body 23a of 2nd Embodiment swells toward the lower surface 7b of the foundation 7 of a structure, supporting the 2nd bag body 23b, it is not necessary to provide the excessive part 23c.

  The first injection means 29 is fixed to the first injection port 22 a through the hollow interior of the pile body 22. The second injection means 30 is fixed to the second injection port 22 b through the hollow interior of the pile body 22. The material of the first injection means 29 and the second injection means 30 is the same as that of the injection means 6 of the first embodiment. Moreover, the 1st injection | pouring means 29 and the 2nd injection | pouring means 30 are not limited to what was fixed to the 1st injection port 22a and the 2nd injection port 22b through the hollow inside of the pile main body 2. FIG. For example, when the inlet for the self-hardening fluid is provided in the first bag body 23 and the second bag body 24, the first injection means 29 and the second injection means 30 are the first bag body 23 and the second bag body. 24 is directly connected to the inlet provided in 24.

  Next, the process of the pile driving method of 2nd Embodiment which uses the pile 21 with a bag body is demonstrated based on FIG. In addition, since a 1st process and a 2nd process are the same as the process of the pile driving method of 1st Embodiment, description is abbreviate | omitted.

  3rd process 1st step Self-hardening from the supply means not shown between the 2nd bag body 24 attached to the circumference | surroundings of the pile main body 22, and the outer peripheral surface of the pile main body 22 through the 2nd injection pipe 30 and the 2nd injection port 22b. Pour fluid. When the self-hardening fluid is poured, the enlarged diameter portion of the second bag body 23b begins to swell evenly toward the drilling surface 8b of the ground 8, and the enlarged diameter portion of the second bag body 23b is in contact with the drilled surface 8b of the ground 8. Abut. Further, when the self-hardening fluid is poured, pressure is applied to the inside of the second bag body 23b, and the enlarged diameter portion of the second bag body 23b widens while pressing the drilling surface 8b.

  When the self-hardening fluid in the second stage second bag body 23b solidifies to some extent, the first bag body 23a attached around the pile body 22 and the outer peripheral surface of the pile body 22 from the supply means (not shown) A self-hardening fluid is poured through the injection tube 29 and the first injection port 22a. When the self-hardening fluid is poured, the diameter-enlarged portion of the first bag body 23a begins to swell evenly toward the drilling surface 8b of the ground 8 while supporting the second bag body 23b on the second bag body 23b. The diameter-enlarged portion of one bag body 23 a comes into contact with the drilling surface 8 b of the ground 8.

  Third stage Further, when the self-hardening fluid is poured into the first bag body 23a, the self-hardening fluid spreads over the surplus portion 23c of the first bag body 23a with the already inflated second bag body 23b as a support. The first bag body 23a swells upward so as to be in close contact with the lower surface 7b of the base 7 of the object. As described above, when the injected self-hardening fluid is hardened, the lower surface 7b of the foundation 7 of the structure and the upper portion of the pile body 22 are connected via the self-hardening fluid in the first bag body 23a. For this reason, a structure can be supported by the pile main body 22.

  As described above, the first bag body 23a expands upward with the second bag body 23b already expanded and solidified as a support. That is, the first bag body 23a can expand upward regardless of the state of the ground 8. Therefore, the method of this 2nd Embodiment is applicable when the drilling surface 8b provided in the ground 8 is too large, or when the ground 8 is too weak.

  An actual example of the pile driving method of the first embodiment will be described with reference to FIG.

  The case where the proof strength, deformation performance, etc. of a structure are improved is demonstrated to an existing underground structure using the pile driving method of 1st Embodiment.

  A structure foundation 7 is provided below the structure floor 33, and the foundation 7 is supported by an existing pile 34. The hole 7a is newly opened in the lower part of the foundation 7, and the pile 1 with a bag body which concerns on 1st Embodiment is driven. Next, in order to reinforce the lower end of the pile body 2, for example, a chemical solution is injected to strengthen the ground 35. Next, a self-hardening fluid is injected into the bag body 3, the upper portion of the bag body 3 and the lower surface 7b of the foundation 7 are brought into close contact with each other, and the lower surface 7b of the foundation 7 and the pile body 2 are connected. Improve.

(The invention's effect)
According to 1st invention, since the lower surface and pile of the foundation of an existing structure are filled without gap by hardening of the self-hardening fluid in the bag body which expands upwards, the existing foundation can be supported stably. . Also, increase the contact area between the bottom surface of the foundation of the existing structure and the bag body by providing a hole larger than the hole of the foundation of the existing structure in the upper ground and increasing the volume of the bag body attached to the pile. It is possible to secure the connection between the newly piled pile and the existing foundation. Moreover, the bag body attached to the pile is formed so as to expand upward, and the amount of the self-hardening fluid injected into the bag body can be reduced.

  Furthermore, by making the gap between the size of the upper ground below the foundation and the outer shape of the pile appropriate, the bag body will face upward while pushing the ground outward and leaving the upper excess part. Therefore, the lower surface of the foundation and the bag can be brought into close contact with each other without increasing the amount of the self-hardening fluid injected into the bag.

  Further, according to the configuration in which the upper portion of the bag body expands toward the lower surface of the foundation and also swells into the periphery of the hole, after the self-hardening fluid in the bag body is hardened, Since the lower surface and the periphery of the hole are supported, the proof stress of the existing structure is strengthened not only in the vertical direction but also in the horizontal direction, which is suitable as seismic reinforcement.

  According to 2nd invention, by using the pile which attached the bag body which has an upper surplus part, using the self-hardening fluid for the lower surface of the foundation by the pile driven toward the ground from the hole of the existing structure It can be reliably supported.

  Furthermore, when the bag body is inflated from below by the self-hardening fluid injected into the bag body, since the regulating member supports the weight of the self-hardening fluid, the upper surplus portion remains, so the remaining surplus The part is expanded at the end, and the bag body can be securely adhered to the lower surface of the foundation.

  According to 3rd invention, by using the pile which attached the 1st bag body and the 2nd bag body, the foundation lower surface was used for self-hardening fluid by the pile driven toward the ground from the hole of the existing structure. It can be reliably supported.

  According to the fourth invention, when the second bag body is inflated with the first bag body as a support, the surplus portion is finally inflated, so that the second bag body can be securely brought into close contact with the lower surface of the foundation.

It is a fragmentary sectional view showing the process of the pile driving method directly under the structure concerning the structure of the pile with a bag concerning a 1st embodiment of the present invention, and a 1st embodiment of the present invention. It is an expanded sectional view of the A section of FIG. It is a fragmentary sectional view which shows the process of the expansion | swelling process of the bag body of the pile with a bag which concerns on 1st Embodiment of this invention, and the pile driving method directly under the structure which concerns on 1st Embodiment of this invention. It is a fragmentary sectional view which shows the process of the expansion | swelling process of the bag body of the pile with a bag which concerns on 1st Embodiment of this invention, and the pile driving method directly under the structure which concerns on 1st Embodiment of this invention. It is a fragmentary sectional view which shows the process of the expansion | swelling process of the bag body of the pile with a bag which concerns on 1st Embodiment of this invention, and the pile driving method directly under the structure which concerns on 1st Embodiment of this invention. It is a fragmentary sectional view showing a desirable process of a pile driving method just under a structure concerning a 1st embodiment of the present invention. It is a fragmentary sectional view showing an example of other restricting means of a pile with a bag concerning a 1st embodiment of the present invention. It is a fragmentary sectional view showing an example of other restricting means of a pile with a bag concerning a 1st embodiment of the present invention. It is a fragmentary sectional view showing an example of other restricting means of a pile with a bag concerning a 1st embodiment of the present invention. It is a fragmentary sectional view of the pile with a bag concerning a 2nd embodiment of the present invention. It is a figure which shows the process of the expansion | swelling process of the pile with a bag which concerns on 2nd Embodiment of this invention, and the pile driving method directly under the structure which concerns on 2nd Embodiment of this invention. It is a figure which shows the various forms of the bag body which concerns on 1st Embodiment. It is a figure which shows the various forms of the bag body which concerns on 2nd Embodiment. It is a figure which shows the cross section of the structure reinforced by the process of the pile driving method directly under the structure of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pile with a bag body 2 Pile body 3 Bag body 3a Extra scale part 4 Fixing means 5 Restriction means 6 Injection means 7 Foundation of structure 8 Ground 10 Pile with bag bodies 11-13 Restriction means 21 Pile 22 with a bag body Pile body 23a First bag body 23b Second bag bodies 25-27 Fixing means 28 Restricting means 29 First injection means 30 Second injection means

Claims (2)

A first step of drilling a hole in the foundation of the structure, a second step of driving a pile into the hole, a self-hardening fluid is poured into the bag body attached around the pile, and the bag body is inflated upward. A third step of closely contacting the lower surface of the foundation,
In the third step, the bag body has a surplus portion on the upper side, provided with a restricting means for restricting the bag body so as to inflate in order toward the surplus portion, and leaving the surplus portion. A pile driving method directly under a structure in which the bag body is inflated from below, and the bag body is inflated upward and is in close contact with the lower surface of the foundation. A pile with a bag body comprising a pile, a bag body attached to the outer periphery of the pile, and an injection means for pouring a self-hardening fluid into the bag body, the bag body at one end side of the pile It is attached to have an extra part,
The pile with a bag body provided with the limiting means which restrict | limits the said bag body so that it may swell in order toward the said surplus part in the said bag body.

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