JP3566099B2 - Construction method of cast-in-place pile - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is intended for seismic reinforcement including measures against liquefaction, or for existing foundations with increased loads on superstructures, when the bearing capacity, the strength of the foundation itself (vertical and horizontal) and the deformation performance during earthquake are insufficient. The present invention relates to a method of constructing a cast-in-place pile for the purpose of improving the strength and deformation performance of a foundation and a cast-in-place pile for a newly-installed foundation.
[0002]
[Prior art]
As the reinforcement of the existing foundation for the purpose of improving the physical strength and deformation performance of the foundation, conventionally, as shown in FIGS. 31 and 32, the extra foot 33 and the extra pile 33 are provided outside the existing pile 32 as shown in FIG. In addition, there is a method in which the footing 31 is additionally provided to improve the bearing capacity, the proof strength and the deformation performance in the event of an earthquake.
[0003]
However, in the method of increasing piles and the like, the space to be used is not sufficient in terms of area only within the plane of the existing foundation, and cannot be used in places where there are restrictions on land or restrictions on headspace immediately below the existing structure.
[0004]
In addition to this, there is a method of improving the ground of the entire lower and surrounding grounds to increase the ground strength immediately below the foundation or immediately below the existing piles in any case of the direct foundation such as the pile foundation and the cloth foundation. However, in such reinforcement by the ground improvement method, unless the entire area immediately below the foundation or a wide area outside the foundation is improved, the required performance cannot be satisfied, and the design does not consider the bearing capacity of the existing pile, Existing piles are wasted, resulting in higher costs.
[0005]
Therefore, without increasing the area and without removing the existing foundation, it is possible to easily and reliably improve the bearing capacity, proof strength, and horizontal deformation performance of the foundation, and if there is an existing pile, it can be used effectively. As a cast-in-place pile construction method directly below an existing foundation, there is one proposed by the applicant in Japanese Patent Application No. 8-285200 (Japanese Patent Application Laid-Open No. Hei 10-25737).
[0006]
This is because, as shown in FIGS. 24 to 30, when there is an existing foundation 21 having an existing pile 22, a through hole 24 is formed in the existing foundation 21 in the vertical direction, and the through hole 24 is used first. The ground is cut by a water jet using a rod 25 to form a hole 23 filled in muddy water. In this case, muddy water such as bentonite may be replaced. The cut earth and sand is discharged upward from the gap between the pipes by making the rod 25 inserted into the through hole 24 into a double pipe or a triple pipe.
[0007]
Next, the bag 26 is inserted into the through hole 24 together with the rod 25, and the bag 26 is filled with a filler 28 such as cement milk, mortar or concrete by using the rod 25, and the bag 26 is covered with the bag 26. A columnar ground improvement body is constructed as a pile body 29. In the figure, reference numeral 30 denotes a support layer.
[0008]
In this case, a predetermined hole for allowing the filler 28 to flow out is provided at an appropriate position of the bag 26, and the filler 28 flows out of this hole into the gap between the bag 26 and the hole 23, and the hole is filled with the filler 28. Filling can also be performed. By sandwiching the bag 26 in a sandwich shape with the filler 28 in this manner, the integrity of the bag 26 with the filler 28 and the ground is improved, and predetermined horizontal proof stress and deformation performance are exhibited.
[0009]
[Problems to be solved by the invention]
When carrying out the method disclosed in Japanese Patent Application No. 8-285200 (Japanese Patent Application Laid-Open No. Hei 10-25737), in the step of filling the filler 28 into the bag 26 in the cut hole 23, If the specific gravity of the filler 28 in 26 is lighter than the muddy water or the stabilizing liquid in the hole 23 or there is not much difference, the bag 26 rises or the bag 26 moves to one side in the hole 23. The bag 26 may be displaced or bent, and the bag 26 cannot be inflated evenly at a predetermined position in the hole 23.
[0010]
Furthermore, earth and sand or slime may accumulate on the bottom of the cut hole 23, and it becomes impossible to obtain a predetermined tip supporting force as a pile.
[0011]
In particular, as described above, in the bag provided with the hole through which the filler 28 flows out, when the filler 28 flows out of this hole into the gap between the bag 23 and the hole 23, the outflow amount is constant in the peripheral direction. The bag 26 may not flow or may flow out below or around the bag 26 before the bag 26 is sufficiently widened, and the bag 26 is likely to float up or to move to one side in the hole 23 to be shifted. .
[0012]
An object of the present invention is to solve the above-mentioned disadvantages of the prior art, insert a bag into a drilled hole and fill the inside of the bag with a filler, or fill a gap between the bag and the gap between the bag and the hole. When the material is filled to improve the bearing capacity, horizontal strength and deformation performance of the pile, the bag can be reliably inflated at a predetermined position in the hole, and the bearing capacity and horizontal strength of the pile And to provide a method for constructing a cast-in-place pile capable of obtaining a predetermined tip supporting force as a pile even when slime is deposited at the bottom of a drilled hole. It is in.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention firstly inserts a bag into a drilled hole, fills the bag with a filler such as cement milk, mortar or concrete, inflates the bag, and covers the bag with the bag. In the case of forming a cast-in-place cylindrical cast pile, a tubular bag fixing member was provided at the tip of the bag , and a steel material such as a reinforcing bar was formed at the lower end of the bag fixing member in a hook shape or a basket shape inside. An insertion guide / anchor is provided in the hole, a rod is inserted into the bag, the insertion guide / anchor is pressed into the ground at the bottom of the hole, and the filler is first filled with the rod through the opening at the tip of the bag. After injecting into the hole through the fixing member and embedding the bag fixing member in the filling material to fix the tip, the rod is pulled up to a height at which the lower end is located in the bag, filler from a discharge port formed on the side of the rod Inflate the bag by discharging the bag, it is an gist to construct a cylindrical place pile covered with a bag.
[0014]
Second, a bag is inserted into the drilled hole, filled with a filler such as cement milk, mortar or concrete, and the bag is inflated to form a cylindrical cast-in-place pile covered with the bag. In this case, a tubular bag fixing member is provided at the tip of the bag, and at the lower end of the bag fixing member, anchors are provided by a plurality of reinforcing bars or the like that spread in a horizontal radial direction in the shape of an umbrella. The rod was inserted , the filler was first injected into the hole through the bag fixing member from the opening at the tip of the bag with the rod, and the bag fixing member was buried in the filler to fix the tip. Later, the rod is pulled up to a height at which the lower end thereof is located in the bag, and the filler is discharged into the bag from a discharge port formed on the side of the rod to expand the bag. And spread the bag horizontally and move the bag horizontally. Sealed, it is an gist to construct a cylindrical place pile covered with a bag.
[0015]
Third, the rod forms a thread around the distal end, and this thread is screwed into a thread formed on the inner peripheral surface of the bag fixing member. Fourth, the rod is formed on the outer periphery of the distal end. The gist of the invention is to provide a plurality of projections and detachably engage with an L-shaped key hole formed on the peripheral surface of the bag fixing member.
[0016]
Fifth, the rod is provided with a spout for discharging a filler for consolidation at the tip, and a spout for discharging the filler into the bag on a side surface located above the spout, so that the filler in the bag is filled. At the time of discharge, the gist of the present invention is to open the discharge port at the same time as dropping the injection port at the tip and closing it with the dropping material.
[0017]
Sixth, the bag is inserted into the excavated hole, the bag is filled with the filling material, the bag is inflated, and the filling material is filled when forming a cylindrical cast-in-place pile covered with the bag. The rod for making the tube has a multi-tube structure, the lower end of one tube is projected downward from the bottom of the bag, and after the other tube is filled with the filler, the lower portion of the bag is filled from the one tube. The gist of the present invention is to solidify the slime deposited in the excavation hole and solidify the slime deposited there, and to consolidate the slime .
[0018]
According to the first aspect of the present invention, a bag is inserted into an excavated hole, and a filling material is filled in the bag or in a space between the bag and the hole to form a cylindrical cast-in-place pile. In this case, an opening is provided at the tip of the bag, a cylindrical bag fixing member is attached to the opening, and then the filler is discharged from the opening to the bottom of the hole. It is fixed and the root is hardened. In this state, the bag is fixed to the bottom of the hole by the bag fixing member at the tip, so that even if the filler is discharged into the bag or into the gap between the bag and the hole, the bag floats or moves. Can be prevented, the bag can be reliably inflated at a predetermined position in the hole, and the supporting force, horizontal strength and deformation performance as a pile can be exhibited.
[0019]
Further, by making a steel material such as a rebar into a hook shape on the inside, or further providing an insertion guide and anchor in a hole formed in a cage shape, not only can the bag be smoothly inserted into the hole, but also a bag fixing member. When the strength of the bag is not sufficient, it can be reinforced, and it can also withstand the filling pressure when filling the inside of the bag and the pulling force when pulling out the rod, so that the tip of the bag can be firmly fixed and fixed. .
[0020]
According to the second aspect of the present invention, a bag is inserted into an excavated hole, and a filler is filled in the bag or in a gap between the bag and the hole to form a cylindrical cast-in-place pile. In this case, an opening is provided at the tip of the bag, a cylindrical bag fixing member is attached to the opening, and then the filler is discharged from the opening to the bottom of the hole. It is fixed and the root is hardened. In this state, the bag is fixed to the bottom of the hole by the bag fixing member at the tip, so that even if the filler is discharged into the bag or into the gap between the bag and the hole, the bag floats or moves. Can be prevented, the bag can be reliably inflated at a predetermined position in the hole, and the supporting force, horizontal strength and deformation performance as a pile can be exhibited.
[0021]
Furthermore, by attaching an anchor made of a plurality of reinforcing bars or the like radially extending in the bone shape of the umbrella, the anchor can be disposed in the horizontal direction, and the movement of the bag can be more reliably prevented.
[0022]
According to the third aspect of the present invention, in addition to the above operation, by temporarily fixing the rod to the bag fixing member by the screw portion, the bag and the rod can be integrally inserted into the hole, and the root of the bag tip can be fixed. After that, by rotating the rod, the rod can be detached from the bag fixing member and pulled up, and the process can be smoothly shifted to the next step of filling the bag with the filler.
[0023]
According to the fourth aspect of the present invention, in addition to the functions of the first to fourth aspects of the present invention, the rod is temporarily fixed to the bag fixing member by the engagement between the projection and the key groove. And the rod can be inserted integrally into the hole.After the root of the bag is fixed, the lock between the rod and the bag fixing member can be released only by slightly rotating the rod, and the rod can be pulled up. The process can be smoothly shifted to the process of filling the inside with the filler.
[0024]
According to the fifth aspect of the present invention, in addition to the above operation, if the bag is inserted into the hole with the bag attached to the rod, the root is hardened at the tip as it is using one rod, and thereafter, And filling of the filler into the bag can be performed continuously.
[0025]
According to the sixth aspect of the present invention, one of the tubes of the multi-tube structure projects below the bag, and the tip of the bag is fixed by this tube. Therefore, even if the filler is discharged into the bag or into the gap between the bag and the hole, the bag can be prevented from floating or moving, and the bag can be reliably inflated at a predetermined position in the hole. Can be After that, if a filler is injected into the drilling hole from a pipe protruding below the bag, the slime and the like deposited here are solidified to obtain a supporting force.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional front view of a first step showing a first embodiment of a casting method of a cast-in-place pile according to the present invention, and FIG. 2 is a vertical sectional front view of a second step of the same. As in the case of the cast-in-place pile constructed by the method shown in Fig. 1, a vertical through hole 4 having a diameter of about 150 mm to 250 mm is formed in an existing foundation (footing) 1 having an existing pile. Then, the ground is cut by, for example, a jet method to cut the hole 3.
[0027]
The present invention also attaches the cylindrical bag 2 made of high-strength fiber to the periphery of the rod 5 in a closed state, and inserts the rod 5 and the bag 2 from the through hole 4 into the hole 3. An opening 6 is formed at the lower end of the bag 2 as shown in FIG. 4, and a bag fixing member 7 for rooting is fixed to the opening 6.
[0028]
The bag fixing member 7 is made of a synthetic resin such as steel or plastic as a material. For example, as shown in FIG. 3, the bag fixing member 7 has a thread winding shape in which flanges 7a and 7b are protruded above and below a cylindrical body 7c. Multiple bolt holes were drilled at intervals. In addition, a polygon other than a cylinder may be used as long as it is cylindrical.
[0029]
In order to fix the bag fixing member 7 to the opening 6 at the lower end of the bag 2, the flange 7 a contacts the outer periphery of the opening 6, while the ring-shaped plate 9 is applied to the inner periphery of the opening 6. Then, the bag 2 is sandwiched between the flange 7a and the plate 9, and the three members are joined by bolts 8.
[0030]
FIG. 5 shows another example of the bag fixing member 7 which is formed in a cylindrical shape without a flange. In order to fix the bag fixing member 7 having such a shape to the bag 2, the bag fixing member 7 is inserted into the opening 6. The upper end of the bag 7 is inserted, and the periphery of the opening 6 of the bag 2 is wrapped around the upper portion of the bag fixing member 7 and fixed with a band material 10.
[0031]
The insertion guide 11 is further attached to the bag fixing member 7 attached to the lower portion of the bag 2 as necessary. When the bag fixing member 7 has a thread winding shape as shown in FIG. 4, the insertion guide 11 is formed of a cylindrical body having a diameter corresponding to the outer diameter of the lower flange 7b, and the bag fixing member 7 is shown in FIG. In the case of such a simple cylindrical shape, a large number of steel materials such as reinforcing bars having a diameter corresponding to the outer diameter of the cylindrical body are arranged in rows, and the lower opening 11b is provided with a tapered portion 11a so as to be tapered. In this case, the width of the opening 11b is formed equal to the outer diameter of the rod 5.
[0032]
Furthermore, an anchor can be separately attached to the bag fixing member 7. This anchor has a plurality of reinforcing bars 12 projecting downward from the cylindrical portion or flange 7b of the bag fixing member 7 as shown in FIGS. 5 and 6, and has a head nut 12a at the lower end as shown in FIG. May be provided.
[0033]
Further, as shown in FIG. 7, a plurality of reinforcing bars 13 can be attached to the upper flange 7a of the bag fixing member 7 as anchors so as to radially spread like an umbrella.
[0034]
As shown in FIG. 8, the lower end of the rod 5 is formed in a conical shape, and a spout 5a of a filling material for consolidation is provided on the side of the rod 5 radially in four directions, for example. A discharge port 5b for discharging the filler into the bag 2 was provided. Then, a closing pipe 15 is disposed inside the discharge port 5b via an O-ring 14 for stopping water, and is supported by a shear pin 16 to support the closing pipe 15 inside the discharge port 5b.
[0035]
In the figure, reference numeral 17 denotes a dropping material such as a plug which removes the shear pin 16 and closes the ejection port 5a. The tip of the dropping material 17 is formed to have the same conical shape as the tip of the rod 5.
[0036]
As means for fixing the rod 5 to the bag fixing member 7, for example, as shown in FIG. 9, a screw portion 5 c is formed on the outer peripheral surface of the rod 5, and a screw portion 7 d is provided inside the cylindrical body 7 c of the bag fixing member 7. Then, the two screw portions 5c and 7d are screwed together.
[0037]
Alternatively, as shown in FIG. 10, an L-shaped key hole 7e is formed to face the side of the cylindrical body of the bag fixing member 7, while the rod 5 has a projection 5d inserted into the key hole 7e. The projection 5d is locked in the key hole 7e.
[0038]
The rod 5 is inserted into the bag 2 having the bag fixing member 7 fixed at the tip as described above, and the tip of the rod 5 is screwed by the threaded portions 5c and 7d, or the key hole 7e and the projection 5d are locked. The bag 2 and the rod 5 are inserted into the hole 3 while the bag 2 is closed as shown in FIG. 1 when the bag 2 is closed. A filler 18 such as cement milk, mortar or concrete is jetted from the jet port 5a at the tip. At this time, the discharge port 5b at the upper part of the rod 5 is closed by the closing pipe 15, so that the filler 18 does not discharge into the bag 2 at the same time.
[0039]
The insertion of the rod 5 is smoothly performed by the insertion guide 11. When a reinforcing bar 12 serving as an anchor is provided, this is pressed into the ground at the bottom of the hole 3. As the 2 spreads, the horizontal reinforcing bars 13 also spread radially.
[0040]
In this way, the filler 18 is spouted to the height of the bag fixing member 7, and is agitated and mixed with the sediment sedimented therein to solidify the root portion. In this state, as shown in FIG. 1, the bag fixing member 7 and the insertion guide 11 are buried in the filler 18 and when the reinforcing bars 12 and 13 are provided, the reinforcing bars 12 are fixed to the ground as shown in FIG. The reinforcing bar 13 is fixed in the filler 18 while being spread and extending in the horizontal radial direction as shown in FIG.
[0041]
With the filler 18 solidified to some extent, the rod 5 is rotated to release the screwing of the threaded portions 5c and 7d, or to release the engagement between the key hole 7e and the projection 5d, so that the rod 5 and the bag fixing member 7 are released. Is released, and the rod 5 is pulled up into the bag 2 as shown in FIG. 2 in a state where the bag fixing member 7 is left in the rooting portion 19.
[0042]
At this time, since the insertion guide 11 also serving as an anchor and the reinforcing bars 12 and 13 serving as anchors are attached to the bag fixing member 7, even if the rod 5 is pulled out, the bag fixing member 7 is pulled out by resistance to pulling out from the ground. It is surely left in the rooting portion 19.
[0043]
A dropping material 17 is inserted from above into the rod 5 pulled up into the bag 2, and a filler 18 such as mortar is further injected into the rod 5 from above, and the dropping material 17 is pushed below the rod 5. As a result, the shear pin 16 is removed, and when the dropping material 17 reaches the lower end of the rod 5, the ejection port 5 a formed here is closed by the dropping material 17.
[0044]
The discharge port 5b formed on the side of the rod 5 has the closed pipe 15 removed by removing the shear pin 16, and the discharge port 5b is opened. Therefore, when the filler 18 is injected into the rod 5, the filler 18 flows out of the outlet 5 b into the bag 2, the filler 18 fills the bag 2, and the bag 2 spreads in the hole 3. At this time, since the tip of the bag 2 is fixed to the stiffening portion 19 via the bag fixing member 7, the bag 2 can resist the filling pressure, and the bag 2 does not move or bend.
[0045]
By expanding the bag 2 in a cylindrical shape in this way, a cylindrical cast-in-place pile is created, and the same strength, vertical strength, and horizontal strength as when a so-called support pile is constructed immediately below the existing foundation, and The columnar improved body exerts the horizontal deformation performance.
[0046]
FIGS. 14 to 16 show a second embodiment. First, as shown in FIG. 14, a stable liquid and air are injected from an injection port 20a by using a triple pipe rod 20 of a high-pressure injection replacement method to form a hole. Alternatively, holes are drilled by jetting with water and air, and thereafter, a stable liquid such as muddy water is filled into the holes 3 from the lower injection ports 20b to stabilize the hole walls and form the holes 3.
[0047]
Next, as shown in FIG. 15, once the triple tube rod 20 is pulled up, the bag fixing member 7, the insertion guide 11 and the bag 2 are attached thereto, and these are reinserted into the holes 3, so that the triple tube rod 20 is removed. Filler 18 such as cement slurry is injected from the lower injection port 20b to the bottom of hole 3 and agitated to consolidate the roots.
[0048]
After the solidification portion 19 is solidified, the bag 2 is expanded by filling the filler 2 such as cement slurry into the bag 2 from the upper injection port 20c while pulling up the triple tube rod 20. In this case, if a predetermined opening 2a is formed in the bag 2, the filler 18 flows out of the opening 2a into the space between the bag 2 and the hole 3, and is filled here, and the bag 2 is filled with the filler. A pile in which 18 is further integrated is created.
[0049]
FIGS. 17 to 19 show a third embodiment. In the second embodiment, after a hole is drilled with a triple pipe rod 20 of a high-pressure injection displacement method, the hole is once pulled up, a bag 2 is attached, and then inserted into the hole 3 again. However, in the third embodiment, as shown in FIG. 17, a hole is drilled with a jet of water or a stable liquid and air in a state where the bag 2 is attached, and then, as shown in FIG. Jet drilling is performed with milk or cement bentonite liquid and air to consolidate this part. Finally, the filling material 18 such as cement milk or mortar is filled into the bag 2 from the triple tube rod 20 as shown in FIG.
[0050]
Thereby, even if slime or the like is deposited at the tip of the pile, this can be solidified, and a solidified body having a large supporting force can be obtained.
[0051]
FIGS. 20 to 23 show a fourth embodiment. In the third embodiment, after the bag 2 is attached to the triple tube rod 20 and inserted into the hole 3, rooting is performed and then the filler 18 is placed in the bag 2. In this fourth embodiment, a multi-tube rod with a double-tube or triple-tube rod 20 is used in this fourth embodiment. For example, the inner tube is attached so as to protrude downward from the bottom of the bag 2, and the outer tube is Is filled with a filler, and then the filler is injected into the slime at the bottom of the hole 3 from the inner pipe protruding downward and solidified, and this portion is solidified into a solidified body having a large supporting force. .
[0052]
In this case, the filling material 18 is injected into the bag 2 before the root consolidation is performed. Since the bottom of the bag 2 is fixed to the inner tube, the filling material 18 is injected into the bag 2 when the filling material 18 is injected into the bag 2. Never move.
[0053]
Although the embodiment has been described in connection with the case where the construction is carried out immediately below the existing foundation, the present invention is not limited to this, and there may be a case where the invention can be carried out also for a newly installed cast in place pile.
[0054]
【The invention's effect】
As described above, the construction method of the cast-in-place pile of the present invention is to insert a bag into the drilled hole and fill the space between the bag or the bag or the space between the bag and the hole with a filler, A bag fixing member is provided at the lower end of the bag to improve the bearing capacity, horizontal strength and deformation performance of the pile, and the bag is fixed at this point, so that when the filler is injected, the bag may rise in the hole. Therefore, the bag can be prevented from being moved or bent, and as a result, the bag can be reliably inflated at a predetermined position in the hole, and the supporting force, horizontal strength and deformation performance as a pile can be reliably improved. Further, by solidifying the tip of the pile, slime and the like deposited here can be solidified, and a solidified body having a large supporting force can be obtained.
[Brief description of the drawings]
FIG. 1 is a vertical sectional front view of a first step showing a first embodiment of a casting method of a cast-in-place pile according to the present invention.
FIG. 2 is a vertical sectional front view of a second step showing the first embodiment of the casting method for cast-in-place piles of the present invention.
FIG. 3 is a perspective view showing an example of a bag fixing member used in the casting method of the cast-in-place pile according to the present invention.
FIG. 4 is a vertical sectional front view in which an insertion guide is attached to a bag fixing member used in the casting method of the cast-in-place pile according to the present invention.
FIG. 5 is a perspective view in which an insertion guide and an anchor are attached to another example of the bag fixing member used in the casting method of the cast-in-place pile according to the present invention.
FIG. 6 is a longitudinal sectional front view in which an insertion guide and an anchor are attached to a bag fixing member used in the casting method of the cast-in-place pile according to the present invention.
FIG. 7 is a longitudinal sectional front view in which a horizontal anchor is attached to a bag fixing member used in the method of constructing a cast-in-place pile according to the present invention.
FIG. 8 is a longitudinal sectional front view of a rod used in the method of constructing a cast-in-place pile according to the present invention.
FIG. 9 is a longitudinal sectional front view showing an example of a locked state of a rod and a bag fixing member used in the method of constructing a cast-in-place pile according to the present invention.
FIG. 10 is a perspective view showing a locking portion between the bag fixing member and the rod used in the casting method of the cast-in-place pile according to the present invention.
FIG. 11 is a longitudinal sectional front view showing a locking portion of a rod used in the method of constructing a cast-in-place pile according to the present invention with a bag fixing member.
FIG. 12 is a longitudinal sectional front view showing a first embodiment of a method for constructing a cast-in-place pile according to the present invention, in which an anchor is fixed to a ground.
FIG. 13 is a vertical sectional front view showing a first embodiment of the method of constructing a cast-in-place pile according to the present invention, in which an umbrella-shaped anchor is fixed to a bolster portion.
FIG. 14 is a vertical sectional front view of a first step showing a second embodiment of the casting method for cast-in-place piles of the present invention.
FIG. 15 is a vertical sectional front view of a second step showing the second embodiment of the method for constructing a cast-in-place pile according to the present invention.
FIG. 16 is a vertical sectional front view showing a third step of the second embodiment of the method for constructing a cast-in-place pile according to the present invention.
FIG. 17 is a vertical sectional front view of a first step showing a third embodiment of the method of constructing a cast-in-place pile according to the present invention.
FIG. 18 is a longitudinal sectional front view of a second step showing a third embodiment of the method of constructing a cast-in-place pile according to the present invention.
FIG. 19 is a vertical sectional front view of a third step showing a third embodiment of the casting method for cast-in-place piles of the present invention.
FIG. 20 is a vertical cross-sectional front view of a first step showing a fourth embodiment of the casting method for cast-in-place piles of the present invention.
FIG. 21 is a longitudinal sectional front view of a second step showing the fourth embodiment of the method for constructing a cast-in-place pile according to the present invention.
FIG. 22 is a vertical sectional front view of a third step showing a fourth embodiment of the method of constructing a cast-in-place pile according to the present invention.
FIG. 23 is a vertical cross-sectional front view of a fourth step showing a fourth embodiment of the casting method for cast-in-place piles of the present invention.
FIG. 24 is a longitudinal sectional front view showing one example of a conventional casting method for cast-in-place piles.
FIG. 25 is a plan view showing one example of a conventional casting method for cast-in-place piles.
FIG. 26 is a front view of a first step of a conventional casting method for cast-in-place piles.
FIG. 27 is a front view of a second step of the conventional casting method for cast-in-place piles.
FIG. 28 is a front view of a third step of the conventional casting method for cast-in-place piles.
FIG. 29 is a front view of a fourth step of the conventional casting method for cast-in-place piles.
FIG. 30 is a front view of a fifth step of the conventional casting method for cast-in-place piles.
FIG. 31 is a vertical sectional front view showing another conventional example.
FIG. 32 is a plan view showing another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Existing foundation 2 ... Bag 2a ... Opening 3 ... Hole 4 ... Through-hole 5 ... Rod 5a ... Spout port 5b ... Discharge port 5c ... Screw part 5d ... Projection 6 ... Opening 7 ... Bag fixing member 7a, 7b ... Flange 7c ... Cylindrical body 7d Screw part 7e Key hole 8 Bolt 9 Plate 10 Band material
11… Insertion guide 11a… Tapered part
11b ... opening 12 ... rebar
12a ... head nut 13 ... rebar
14… O-ring 15… Closed pipe
16 ... Sharpin 17 ... Dropping material
18… Filling material 19… Rooting part
20: Triple tube rod 20a, 20b, 20c: Injector
21: Existing foundation 22: Existing pile
23 ... hole 24 ... through hole
25… Rod 26… Bag
28… Filling material 29… Pile
30 ... Support layer 31 ... Footing
32: Existing pile 33: Additional pile

Claims (6)

When inserting a bag into the drilled hole, filling the bag with a filler such as cement milk, mortar or concrete, inflating the bag, and creating a cylindrical cast-in-place pile covered with the bag, A tubular bag fixing member is provided at the tip of the bag, and a lower end of the bag fixing member is provided with an insertion guide / anchor into a hole formed in a hook shape or a cage shape with steel material such as a reinforcing bar inside the bag. A rod is inserted into the hole, the insertion guide / anchor is pressed into the ground at the bottom of the hole, and the filler is first injected into the hole from the opening at the tip of the bag through the bag fixing member with the rod to fix the bag. After the member is buried in the filler and the tip of the rod is solidified, the rod is pulled up to a height at which the lower end is located in the bag, and the filler is discharged from the discharge port formed on the side of the rod. Discharge into the bag to inflate the bag and cover it Method of applying place pile, characterized in that construct a cylindrical place pile. When inserting a bag into the drilled hole, filling the bag with a filler such as cement milk, mortar or concrete, inflating the bag, and creating a cylindrical cast-in-place pile covered with the bag, A tubular bag fixing member is provided at the tip of the bag, and at the lower end of the bag fixing member, anchors are provided by a plurality of reinforcing bars or the like that spread in a horizontal radial direction like an umbrella bone, and a rod is inserted into the bag. , after performing root compaction of the tip portion by embedding a bag fixing member first injected into the opening of the distal end of the bag into the hole through the bag fixing member with a filler in the rod within the filler, the The rod is pulled up to the height where the lower end is located in the bag, and the filler is discharged into the bag from the discharge port formed on the side of the rod to inflate the bag. to prevent movement of the bag in the horizontal direction and spread in a direction, Method of applying place pile, characterized in that construct a cylindrical place pile covered with. 3. The method for constructing a cast-in-place pile according to claim 1, wherein the rod has a threaded portion formed around the distal end portion, and the threaded portion is screwed into a threaded portion formed on the inner peripheral surface of the bag fixing member. 3. The method for constructing a cast-in-place pile according to claim 1, wherein the rod is provided with a plurality of protrusions on an outer periphery of a tip portion, and is detachably engaged with an L-shaped key hole formed on a peripheral surface of the bag fixing member. . The rod has a spout at the tip for discharging the filling material for consolidation, and a spout at the side above the spout to discharge the filler into the bag. The method for constructing a cast-in-place pile according to any one of claims 1 to 4 , wherein the spout port is closed with a dropping material and the discharge port is opened at the same time . Insert a bag into the drilled hole, fill the bag with filling material, inflate the bag, and create a cylindrical cast-in-place pile covered with the bag, a rod for filling the filling material Into a multi-pipe structure, the lower end of one pipe is projected downward from the bottom of the bag, and after filling the filler with the other pipe into the bag, the one pipe is inserted into the excavation hole below the bag. A method for constructing a cast-in-place pile, characterized by injecting and solidifying the slime deposited here and consolidating it.

Images