JP6507787B2 - Pile foundation repair method, pile foundation repair kit and pile foundation structure - Google Patents

Description

  The present disclosure relates to a pile foundation repair method, a pile foundation repair kit used for the method, and a pile foundation structure suitable for the method.

  In pile foundations, with the deformation of the pile caused by the inertia force of the building at the time of earthquake, a gap may be generated between the head of the pile and the ground, and the ground reaction force may be reduced. In particular, as a method for suppressing such a decrease in ground reaction force that appears notably in the vicinity of the pile head, Patent Document 1 forms a recess around the pile head and fills the recess with a granular material. It discloses a method of suppressing the reduction of the ground reaction force. According to this method, even if a gap is generated around the head at the time of an earthquake, the gap is filled with the granular material having fluidity, so that the decrease in ground reaction force is suppressed.

JP, 2013-44165, A

As a method of suppressing the ground reaction force decrease at the time of the earthquake during the earthquake, the method of suppressing the fall of the pile head ground reaction force disclosed in Patent Document 1 is useful, but it is only a temporary repair. , It is desirable to recover ground reaction force to the original ground level.
In view of the above-mentioned circumstances, an object of at least one embodiment of the present invention is a pile foundation repair method capable of recovering the ground reaction force of a pile foundation in which a gap is generated due to an earthquake to the same extent as before the earthquake occurrence. It is providing a pile foundation repair kit used for a method, and a pile foundation structure suitable for the method.

(1) A pile foundation repair method according to at least one embodiment of the present invention,
A filling material pressing step is performed, in which a filling material is pressed into the gap formed between the pile and the ground due to the earthquake after the earthquake.

  According to the above configuration (1), by pressing the filling material into the gap formed between the pile and the ground due to the earthquake, not only the gap can be filled but also the ground around the pile can be compacted, and the ground The force can be restored to the same level as before the earthquake.

(2) In some embodiments, in the above configuration (1),
A bag attachment step of attaching an inflatable bag by pressing the filler material on one end side of the pile;
A pile installation step of installing the pile so that the bag body is buried in the ground;
A piping process of piping a supply pipe for supplying a filler to the bag body;
And further
In the filling material pressing step, the filling material is supplied to the bag through the supply pipe.

  According to the above configuration (2), it is possible to fill the gap and compact the ground by the expanded bag body by pressing the filler into the bag body attached to the pile and expanding it.

(3) In some embodiments, in the above configuration (2),
The plurality of bag bodies are concentrically attached to the pile in the bag body attaching process,
The filler is pressed into any one of the plurality of bags in the filler pressing step.

  According to the above configuration (3), the plurality of bag bodies are concentrically attached to the pile, and the filling material is pressed into one bag body in the filling material press-in process, so the other bag bodies are left unused. . Therefore, when a gap is generated again by the next earthquake, an unused bag can be expanded to re-compact the ground while filling the gap. Therefore, even if earthquakes occur repeatedly, ground reaction force can be maintained.

(4) In some embodiments, in the above configuration (2) or (3),
Attaching the bag body to each of the plurality of piles in the bag body attaching step;
In the piping step, a header pipe and a plurality of branch pipes are prepared as the supply pipe, and the bag attached to each of the plurality of piles and the header pipe are connected by the branch pipe,
In the filling material pressing step, the filling material is simultaneously filled in the bag attached to each of the plurality of piles through the header pipe and the branch pipe.

  According to the above configuration (4), the filler can be easily pressed into the plurality of bags by simultaneously pressing the filler into the plurality of bags attached to the plurality of piles through the header pipe and the branch pipe. Can. In addition, by pressing the filler simultaneously through the header pipe and the branch pipe, the filler can be pressed into the plurality of bags at the same pressure. For this reason, ground reaction force can be made uniform among a plurality of piles, and the stress acting on the piles at the time of the next earthquake can be made uniform. As a result, the earthquake resistance of the pile can be improved.

(5) In some embodiments, in the above configuration (1),
In the filling material pressing step, a filling material is pressed into the gap between the pile and the ground using a jack.
According to the above configuration (5), the ground can be reliably compacted while filling the gap by press-fitting the filler using the jack.

(6) The pile foundation structure according to at least one embodiment of the present invention,
Piles buried in the ground,
A bag which is embedded in the ground in a state of being attached to the pile so as to surround the upper end side of the pile, and which is expandable by press-fitting of a filling material;
Equipped with

  According to the above configuration (6), the bag can be expanded by pressing the filler into the bag attached to the pile so as to surround the upper end side of the pile. Therefore, even if a gap occurs between the pile and the ground due to the earthquake, the ground around the pile can be compacted while filling the gap by pressing the filler into the bag body, and the ground reaction force before the earthquake It can be recovered to the same extent.

(7) In some embodiments, in the above configuration (6),
The apparatus further comprises a supply pipe for supplying a filler to the bag body.
According to the above configuration (7), the filler can be easily pressed into the bag through the supply pipe.

(8) In some embodiments, in the above configuration (7),
The plurality of piles are buried in the ground,
The bag is attached to each of the plurality of stakes,
The supply pipe includes a header pipe and a plurality of branch pipes connected to the header pipe,
The header pipe is in communication with the plurality of bags via the plurality of branch pipes.

  According to the above configuration (8), the filler can be easily press-fit into the plurality of pouches by simultaneously pressing the filler into the plurality of pouches attached to the plurality of piles through the header pipe. Further, by simultaneously pressing in the filler through the header pipe, it is possible to press the filler into the plurality of bags at the same pressure. For this reason, ground reaction force can be made uniform among a plurality of piles, and the stress acting on the piles at the time of the next earthquake can be made uniform. As a result, the earthquake resistance of the pile can be improved.

(9) A pile foundation structure according to at least one embodiment of the present invention,
Piles buried in the ground,
A beam provided so as to surround the head in a state where an opening is present between the pile and the head;
A plurality of lid members removably disposed between the head and the beam so as to close the opening;
The opening has a size that allows a filler to be pressed into the gap between the pile and the ground due to the earthquake after the earthquake.

  According to the above configuration (9), by removing the lid member, it is possible to easily approach the gap generated between the pile and the ground through the opening. Therefore, the filler can be easily pressed into the gap, and the ground can be compacted while filling the gap.

(10) A pile foundation structure according to at least one embodiment of the present invention,
Piles buried in the ground,
A pile cap surrounding a top end of the pile and having a plurality of first side faces orthogonal to each other;
A plurality of beams each extending horizontally from the plurality of first side surfaces;
Equipped with
The pile cap further includes at least one second side surface having a normal direction different from the normal direction of the plurality of first side surfaces between the plurality of first side surfaces in the circumferential direction of the vertical axis.

  According to the above configuration (10), by providing the second side surface on the pile cap, the size of the portion of the pile cap located between the beams can be reduced, and from the beams to the pile, It can easily approach the gap created between the ground and the ground. Therefore, the filler can be easily pressed into the gap without processing the pile cap or the beam.

(11) A pile foundation repair kit according to at least one embodiment of the present invention,
It is a pile foundation repair kit that can be press-fit after the earthquake into a gap created between the pile and the ground by the earthquake,
It comprises a plurality of blocks which can be arranged along the circumferential direction of the outer peripheral surface of the pile.

  According to the above configuration (11), it is possible to compact the ground while filling the gaps by press-fitting the plurality of blocks into the gaps around the pile.

(12) In some embodiments, in the above configuration (11),
The plurality of blocks are configured by a plurality of blocks that can be arranged in the circumferential direction of the outer circumferential surface of the pile and in the axial direction of the pile.
According to the above configuration (12), since the plurality of blocks are arranged in the axial direction of the pile, each block can be made smaller. Therefore, regardless of the ceiling height of the work space, the block can be press-fitted to a desired depth.

(13) In some embodiments, in the above configuration (12),
The plurality of blocks arranged in the axial direction of the pile can be engaged with each other.
According to the above configuration (13), since the plurality of blocks arranged in the axial direction of the pile can be engaged with each other, the blocks can be easily press-fitted into the gap regardless of the depth of the gap .

(14) In some embodiments, in any one of configurations (11) to (13),
The plurality of blocks arranged in the circumferential direction of the outer circumferential surface of the pile can be connected to each other.
According to the above configuration (14), since the plurality of blocks arranged in the circumferential direction of the outer peripheral surface of the pile can be connected to each other, the blocks in the connected state can be press-fitted, making it easy to insert the blocks into the gap Can be press-fit.

(15) In some embodiments, in any one of the above configurations (11) to (14),
At least a portion of the plurality of blocks has a wedge-shaped cross-sectional shape.
According to the above configuration (15), since at least one portion of the plurality of blocks has a wedge-shaped cross-sectional shape, the blocks can be easily press-fit into the gap.

  According to at least one embodiment of the present invention, a pile foundation repair method capable of recovering the ground reaction force of a pile foundation having a gap caused by an earthquake to the same degree as before the earthquake occurrence, the pile foundation repair used in the method A kit and a pile foundation structure suitable for the method are provided.

It is a schematic sectional drawing which shows schematic structure of the structure which concerns on one Embodiment of this invention. It is a flow chart for explaining a rough procedure of a pile foundation repair method concerning one embodiment of the present invention. It is a flow chart for explaining a rough procedure of a pile foundation repair method concerning another one embodiment of the present invention. It is a schematic sectional drawing for demonstrating the state by which the filling material was pressingly injected in the clearance gap between a pile and a ground by the pile-base repair method which concerns on one Embodiment of this invention. It is a schematic sectional drawing for demonstrating the bag applied to the pile foundation structure which concerns on one Embodiment of this invention. It is a schematic sectional drawing for demonstrating the pile foundation structure which concerns on one Embodiment of this invention. It is a schematic sectional drawing for demonstrating the pile foundation structure which concerns on other one Embodiment of this invention. It is a schematic sectional drawing for demonstrating the pile foundation structure which concerns on other one Embodiment of this invention. It is a schematic diagram for explaining the composition of piping for filler pressing in in the pile foundation structure concerning other one embodiment of the present invention. It is a schematic sectional drawing which shows schematic structure of the structure based on other one Embodiment of this invention. It is a schematic sectional drawing for demonstrating the state by which the filling material was pressingly injected in the clearance gap between a pile and a ground by the pile-base repair method which concerns on other one Embodiment of this invention. It is a schematic sectional drawing for demonstrating the state by which the filling material was pressingly injected in the clearance gap between a pile and a ground by the pile-base repair method which concerns on other one Embodiment of this invention. It is a perspective view showing roughly a pile foundation repair kit concerning one embodiment of the present invention. It is a perspective view showing roughly a pile foundation repair kit concerning other one embodiment of the present invention. It is a perspective view showing roughly a part of pile foundation repair kit concerning other one embodiment of the present invention. It is a perspective view showing roughly a part of pile foundation repair kit concerning other one embodiment of the present invention. It is a schematic sectional drawing for demonstrating the state by which the filling material was pressingly injected in the clearance gap between a pile and a ground by the pile-base repair method which concerns on other one Embodiment of this invention. It is a schematic sectional drawing for demonstrating the state by which the filling material was pressingly injected in the clearance gap between a pile and a ground by the pile-base repair method which concerns on other one Embodiment of this invention. It is a schematic sectional drawing for demonstrating the state by which the filling material was pressingly injected in the clearance gap between a pile and a ground by the pile-base repair method which concerns on other one Embodiment of this invention. It is a schematic sectional drawing for demonstrating the clearance gap which arose between the pile constructed by embedding a prefabricated pile in a hole, and the ground. It is a schematic perspective view for demonstrating the structure around a pile head in the pile foundation structure which concerns on other one Embodiment of this invention. It is a schematic sectional drawing for demonstrating the state by which the filling material was pressingly injected in the clearance gap between a pile and a ground by the pile-base repair method which concerns on other one Embodiment of this invention. It is a schematic perspective view for demonstrating the structure around a pile head in the pile foundation structure which concerns on other one Embodiment of this invention.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely illustrative. Absent.
For example, a representation representing a relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” is strictly Not only does it represent such an arrangement, but also represents a state of relative displacement with an angle or distance that allows the same function to be obtained.
For example, expressions that indicate that things such as "identical", "equal" and "homogeneous" are equal states not only represent strictly equal states, but also have tolerances or differences with which the same function can be obtained. It also represents the existing state.
For example, expressions representing shapes such as quadrilateral shapes and cylindrical shapes not only represent shapes such as rectangular shapes and cylindrical shapes in a geometrically strict sense, but also uneven portions and chamfers within the range where the same effect can be obtained. The shape including a part etc. shall also be expressed.
On the other hand, the expressions "comprising", "having", "having", "including" or "having" one component are not exclusive expressions excluding the presence of other components.

  FIG. 1 is a view showing a schematic configuration of a structure 1. The structural body 1 is configured by a pile foundation structure (substructure) 3 embedded in the ground and an upper structure 5 supported by the ground via the pile foundation structure 3. The pile foundation structure 3 has a plurality of piles 6 embedded in parallel in the ground and a connecting body 8 for mutually connecting upper ends (heads) of the plurality of piles 6. The connecting body 8 extends between the heads of the plurality of piles 6 and has the function of aligning the horizontal displacement among the plurality of piles 6.

FIG. 2 is a flowchart showing a schematic procedure of a pile foundation repair method according to at least one embodiment of the present invention. As shown in FIG. 2, the pile foundation repair method has a filling material press-in step S <b> 10 in which the filling material is pressed into the gap formed between the pile 6 and the ground due to the earthquake after the earthquake.
Here, FIG. 4, FIG. 11, FIG. 12, FIG. 17 to FIG. 19 and FIG. 22 explain the state where the filler 10 is pressed into the gap between the pile 6 and the ground caused by the earthquake in the filler pressing step S10. 1 is a schematic cross-sectional view of FIG.

  According to the above-described pile foundation repair method, by pressing the filling material 10 into the gap formed between the pile 6 and the ground due to the earthquake, not only the gap is filled but also the ground around the pile 6 is compacted. Ground reaction force can be restored to the same level as before the earthquake.

FIG. 3 is a flowchart showing a schematic procedure of a pile foundation repair method according to some embodiments. The pile foundation repair method shown in FIG. 3 further includes a bag attachment step S12, a pile installation step S14, and a piping step S16.
FIG. 5 is a view for explaining the bag attachment step S12. As shown in FIG. 5, in the bag attachment step S12, at least one bag 14 that is expandable by pressing the filler 10 is attached to one end side of the pile 6.
The bag body 14 is provided so as to surround one end side of the pile 6 and has an inlet 16 for the filler 10. The bag body 14 is made of, for example, a resin-made sheet 18, and the sheet 18 is fixed to the pile 6 by the fixing member 20 at two places separated in the axial direction of the pile 6.

In pile installation process S14, as shown to FIGS. 6-8 and FIG. 10, the pile 6 is installed so that the bag body 14 may be embed | buried under the ground. Immediately after the pile 6 is installed, the bag body 14 is not filled with the filler 10, and the bag body 14 is not expanded.
In piping process S16, as shown in FIG.4, FIG.7, FIG.8 and FIG. 10, the supply pipe 22 for supplying the filler 10 to the bag 14 is piped.
Then, in the filling material pressing step S10, the filling material 10 is supplied to the bag body 14 through the supply pipe 22, and the bag body 14 is expanded.

  According to the above-described pile foundation repair method, it is possible to fill the gap and compact the ground by the expanded bag body 14 by pressing the filling material 10 into the bag body 14 attached to the pile 6 and expanding it.

  In some embodiments, the filler 10 filled in the bag 14 is flowable, can be hardened after being pressed into the bag 14, and has a hardness (modulus of elasticity and uniaxial compressive strength) after hardening. Larger than ground. As such a filler 10, for example, mortar, soil cement, cement milk, fresh concrete or the like can be used.

  In some embodiments, in the bag attachment step S12, a plurality of bags 14 are concentrically attached to the stake 6 as shown in FIG. Then, the filler 10 is pressed into any one of the plurality of bag bodies 14 in the filler pressing step S10.

According to the above configuration, since the plurality of bag bodies 14 are concentrically attached to the pile 6 and the filler 10 is pressed into one bag body 14 in the filler material pressing step S10, the other bag bodies 14 are unused. It is left as it is. Therefore, when a gap is generated again by the next earthquake, the unused bag body 14 can be expanded to re-compact the ground while filling the gap. Therefore, even if earthquakes occur repeatedly, ground reaction force can be maintained.
In some embodiments, when the plurality of bladders 14 are concentrically attached to the stake 6, the filling material 10 is pressed in order from the inner bladder 14.

FIG.9 and FIG.10 is a figure for demonstrating the pile foundation repair method which concerns on some embodiment. As shown in FIGS. 9 and 10, in some embodiments, the bag 14 is attached to each of the plurality of stakes 6 in the bag attachment step S12.
Then, in the piping process S16, the header pipe 24 and the plurality of branch pipes 26 are prepared as the supply pipe 22, and the bag body 14 attached to each of the plurality of piles 6 and the header pipe 24 are connected by the branch pipe 26.
Then, in the filling material pressing step S10, the filling material 10 is simultaneously filled in the bag body 14 attached to each of the plurality of piles 6 through the header pipe 24 and the branch pipe 26.

  According to the above configuration, the filler 10 is easily inserted into the plurality of bag bodies 14 by pressing the filler into the plurality of bag bodies 14 attached to the plurality of piles 6 simultaneously through the header pipe 24 and the branch pipe 26. It can be pressed in. Further, by pressing the filler 10 simultaneously through the header pipe 24 and the branch pipe 26, the filler 10 can be pressed into the plurality of bag bodies 14 with the same pressure. For this reason, ground reaction force can be made uniform among a plurality of piles 6, and stress acting on a plurality of piles 6 at the time of the next earthquake can be made uniform. As a result, the earthquake resistance of the pile 6 can be improved.

In some embodiments, as shown in FIG. 9, the filler 10 is pressed into the bag 14 by the pumping device 28. For example, pumping device 28 is a cement milk pumping device.
In some embodiments, as shown in FIG. 9, a pressure gauge 30 is attached to the supply pipe 22 to measure the pressure of the filling material 10 in the supply pipe 22. For example, the pressure gauge 30 is attached to the header pipe 24.

  According to the above-described configuration, it is possible to determine the end timing of the filler pressing step S10 based on the pressure of the filler 10 measured by the pressure gauge 30. That is, when the pressure of the filler 10 exceeds a preset threshold value, the filler 10 is sufficiently pressed into the gap, and it is considered that the surrounding ground is compacted, and the filler pressing step S10 is ended. Can.

In some embodiments, as shown in FIG. 9, the pumping device 28 or the supply pipe 22 is provided with a flow meter 32 capable of measuring the flow rate of the filling material 10.
According to the above-described configuration, it is possible to determine the end timing of the filler press-in step S10 based on the integrated value of the flow rate of the filler 10 measured by the flow meter 32. That is, when the integrated value of the flow rate of the filler 10 exceeds a preset threshold, the filler 10 is sufficiently pressed into the gap, and it is considered that the surrounding ground is compacted, and the filler pressing step S10 is performed. Can end.

In some embodiments, as shown in FIG. 9, a controller 34 for controlling the pumping device 28 is provided integrally with or separately from the pumping device 28.
According to the above-described configuration, the control device 34 can determine the end time of the filling material pressing step S10 based on the pressure of the filling material 10 measured by the pressure gauge 30, and stop the pumping device 28. Alternatively, the control device 34 can determine the end timing of the filling material pressing step S10 based on the integrated value of the flow rate of the filling material 10 measured by the flow meter 32, and stop the pumping device 28. Further, the control device 34 determines the end time of the filling material pressing step S10 based on the pressure of the filling material 10 measured by the pressure gauge 30 and the integrated value of the flow rate of the filling material 10 measured by the flow meter 32. , The feeding device 28 can be stopped.
If the flow rate of the filler 10 per unit time is known, the pumping time may be measured by a timer that measures the pumping time, and the end time of the filler pressing step S10 may be determined based on the pumping time.

In some embodiments, as shown in FIG. 11, FIG. 12 and FIG. 17, the filler material 10 is press-fitted using a jack 36 into the gap between the pile 6 and the ground caused by the earthquake.
According to the above configuration, by pressing the filler 10 using the jacks 36, the ground can be reliably compacted while filling the gaps.

In some embodiments, as shown in FIG. 11 and FIG. 17, all or part of the filler 10 is constituted by particles such as sand, gravel or dry mortar.
In some embodiments, as shown in FIGS. 12, 17-19, and 22, all or part of the filler 10 is constituted by a plurality of blocks 38.
The block 38 is made of a material having a hardness (elastic coefficient and uniaxial compressive strength) greater than that of the surrounding ground, such as wood, resin, concrete or metal.

  In some embodiments, as shown in FIGS. 13 and 14, the plurality of blocks 38 may be arranged in the circumferential direction of the pile 6 to form an annular shape and surround the pile 6. The number of blocks 38 (division number) in the circumferential direction of the stake 6 is not particularly limited, and may be two or more.

In some embodiments, some or all of the plurality of blocks 38 have a wedge-shaped cross-sectional shape as shown in FIG.
The displacement of the pile 6 in the horizontal direction at the time of the earthquake is larger at the upper side, and the gap generated between the pile 6 and the ground by the earthquake becomes larger as it approaches the upper side. Therefore, if the block 38 has a wedge-shaped cross-sectional shape as in the above configuration, the block 38 can appropriately fill the gap. Further, if the block 38 has a wedge-shaped cross-sectional shape, the load for press-fitting does not become excessively large, and the block 38 can be easily press-fitted into the gap.

In some embodiments, as shown in FIG. 13, the blocks 38 arranged in the circumferential direction of the stake 6 can be connected.
According to the above configuration, when the annularly arranged blocks 38 are press-fitted, since the blocks 38 are connected to each other, the posture of the blocks 38 is stabilized and the blocks 38 descend smoothly along the pile 6 be able to. For this reason, the block 38 can be easily press-fit into the gap.
In some embodiments, as shown in FIG. 13, the plurality of blocks 38 are fastened together by bolts.

In some embodiments, as shown in FIGS. 12, 17-19 and 22, the plurality of blocks 38 are arranged in the axial direction of the stake 6.
According to the above configuration, since the plurality of blocks 38 are arranged in the axial direction of the pile 6, each block 38 can be made smaller. Thus, regardless of the ceiling height of the work space, the block 38 can be press-fitted to a desired depth. For example, the work space is a maintenance pit provided between the pile foundation structure 3 and the superstructure 5. Details will be described later.

In some embodiments, the plurality of blocks 38 are arranged in the axial direction of the stake 6, and as shown in FIGS. 12, 17-19 and 22, the block 38, which is pressed in first, is the rear. It is thinner than the block 38 pressed in.
The gap formed between the pile 6 and the ground gradually narrows as the depth increases. According to the above configuration, since the block 38 pressed in earlier is thinner, the block 38 of the appropriate thickness corresponding to the width of the gap can be pressed in, and the block 38 can be pressed in easily to the desired depth. can do.

In some embodiments, as shown in FIG. 16, the plurality of axially arranged blocks 38 of the stake 6 can be engaged with one another.
According to the above configuration, since the plurality of blocks 38 arranged in the axial direction of the pile 6 can be engaged with each other, when a load is applied to the block 38 located above, the blocks 38 located below are provided. Load is transmitted reliably. Therefore, even if the gap is deep, the plurality of blocks 38 can be easily pressed into the gap.
In some embodiments, as shown in FIG. 16, each block 38 has a projection 40 and a recess 42 capable of receiving the projection 40 to engage the blocks 38 in the axial direction of the pile 6. It is provided.
In some embodiments, as shown in FIG. 16, the protrusion 40 is constituted by two or more pins 44, and the recess 42 is constituted by a hole 46 capable of receiving the pin 44.

In some embodiments, as shown in FIG. 17, the filler 10 is comprised of particulates and blocks 38.
In some embodiments, as shown in FIG. 17, the filler 10 is constituted by the particulate matter and the block 38, and the particulate matter is pressed into the deep region of the gap, and the block 38 is pressed into the shallow region of the gap. Ru.
According to this configuration, the gap can be completely filled with the particulate matter and the block 38.

In some embodiments, the inflatable bag 14, the pressed-in particulate matter, or the particulates in the newly-formed gap when a new gap is created between the press-in block 38 and the ground due to an earthquake. And one or both of the blocks 38 are pressed in.
According to this configuration, even if a gap occurs again due to repeated occurrence of the earthquake, the gap is filled by pressing one or both of the granular material and the block 38 into the gap, and the ground reaction force is restored. It can be done.

  Here, as shown in FIG. 20, in the case of a prefabricated pile in which the pile 6 is embedded in a hole formed in advance, the periphery of the pile 6 is covered with the adhesive layer 48 made of hardened soil cement or cement milk There is. In some embodiments, as shown in FIG. 18, the filler 10 is pressed into the outside of the adhesive layer 48. In some embodiments, as shown in FIG. 19, the filler 10 is pressed into the adhesive layer 48.

Further, as shown in FIG. 20, the adhesive layer 48 may be cracked. In some embodiments, the cracks are filled with particulates to increase the hardness of the adhesive layer 48.
In some embodiments, the cracks in the adhesive layer 48 may be filled with dry mortar as particulates to increase the strength of the adhesive layer 48.
In some embodiments, the filler 10 is pressed inside or outside the adhesive layer 48 while filling the cracks in the adhesive layer 48 with particulate matter.
In some embodiments, the adhesive layer 48 is crushed into particles, and the filler 10 is pressed into the shallow regions of the gaps while filling the deep regions of the gaps with the particles.

In some embodiments, the pile foundation structure 3 may be configured as a superstructure 5 to support a bridge or the like, as shown in FIG. In this case, the connecting body 8 connecting the heads of the stakes 6 is constituted by the footing 50.
In some embodiments, as shown in FIG. 10, the header pipe 24 and the branch pipe 26 as the supply pipe 22 are provided along the inside of the footing 50 or the surface of the footing 50.

  In some embodiments, the pile foundation structure 3 has an upper portion via the seismic isolation device 52, as shown in FIG. 4, FIG. 6, FIG. 7, FIG. 11, FIG. 12, FIG. It is a seismic isolation building pile foundation configured to support the structure 5.

  In some embodiments, the pile foundation structure 3 is a seismic isolation device 52 on the head of the pile 6, as shown in FIGS. 4, 6, 11, 12 and 17-19. It has a pile head isolation structure in which the In the pile head base isolation structure, a connecting body 8 connecting the heads of the piles 6 is constituted by a beam (flat beam) 54 made of reinforced concrete.

  In some embodiments, as shown in FIGS. 4, 6, 11, 12 and 17 to 19, the pile foundation structure 3 comprises a pile 6 embedded in the ground and a pile 6 Beam 54 provided so as to surround the head of the pile 6 with the opening 56 between the head and the head, and removable between the head of the pile 6 and the beam 54 so as to close the opening 56 And a plurality of lid members 58 disposed. And the opening 56 has a magnitude | size which can press-fit the filler 10 after the earthquake to the clearance gap which arose between the pile 6 and the ground by the earthquake.

  According to the above configuration, by removing the lid member 58, it is possible to easily approach the gap formed between the pile 6 and the ground through the opening 56. For example, by disposing the jack 36 through the opening 56, the jack 36 can obtain reaction force for press-fitting from the upper structure 5. Also, for example, the supply pipe 22 can be detachably connected to the bag body 14 through the opening 56. Therefore, the filler 10 can be easily press-fitted into the gap, and the ground can be compacted while filling the gap.

  Here, the width W of the gap generated between the pile 6 and the ground is, for example, about 10 cm. If the filler 10 is constituted by a block 38, the block 38 has a thickness greater than the width W of the gap. In some embodiments, the width W of the opening 56 is set to 5 cm or more and 50 cm or less. The width W of the opening 56 is the length of the opening 56 in the radial direction of the pile 6 as shown in FIG.

In some embodiments, the plurality of lid members 58 have a generally annular shape as shown in FIG. 21 and are arranged to fill the gap between the pile 6 and the beam 54. Thus, the plurality of lid members 58 together with the beams 54 constitute the connector 8. However, the lid member 58 may not have an annular shape as a whole.
In some embodiments, the plurality of lid members 58 are harder than the beams 54 and have a high modulus of elasticity. For example, the plurality of lid members 58 are made of concrete or metal.
In some embodiments, a beam 54 is provided in intimate contact with the stake 6. In this case, in order to repair the pile foundation structure 3, a part of the beam 54 around the pile 6, in other words, a part of the connecting body 8 is removed to approach the gap between the pile 6 and the ground. After filling the filler 10 in the gap, the removed portion of the connecting body 8 is repaired.

  In some embodiments, the pile foundation structure 3 has a foundation seismic isolation structure as shown in FIG. 7 and FIG. In the base isolation structure, the upper end (head) of the pile 6 is covered with a block (pile cap) 60 made of concrete. A plurality of beams (underground beams) 62 extend from the plurality of side surfaces 64 of the pile cap 60 along the horizontal direction. In the pile foundation structure 3 of the foundation seismic isolation structure, the pile cap 60 and the underground beam 62 constitute a connected body 8. The underground beam 62 of the foundation seismic isolation structure usually has a larger cross-sectional area than the flat beam 54 of the pile-head seismic isolation structure, and has high rigidity.

  In some embodiments, the pile foundation structure 3 is a normal pile foundation structure having no seismic isolation device as shown in FIGS. 8 and 10. In a normal pile foundation structure, the connection body 8 and the upper structure 5 of the pile foundation structure 3 are integrally formed.

  In some embodiments, as shown in FIGS. 7, 8 and 10, at least a portion of the supply tube 22 for supplying the filling material 10 to the bag 14 is inside or on the surface of the connector 8. Arranged along.

  In some embodiments, at least a portion of the feed tube 22 extends inside the connector 8 and at least a portion of the feed tube 22 is piped prior to constructing the connector 8. For example, at least a part of the supply pipe 22 is piped before placing the ready concrete to construct the connector 8.

  In some embodiments, as shown in FIGS. 22 and 23, the pile foundation structure 3 includes a pile 6 and a concrete block 60 that encloses upper ends of the pile 6 and has a plurality of mutually orthogonal side surfaces. And a plurality of beams (underground beams) 62 extending in the horizontal direction from the plurality of side surfaces (first side surfaces) 64, respectively. The block 60 made of concrete has at least one side surface having a normal direction different from the normal direction of the plurality of first side surfaces 64 between the plurality of first side surfaces 64 in the circumferential direction of the vertical axis 2) further having 66).

  According to the above configuration, by providing the second side surface 66 in the block 60, the size of the portion of the block 60 located between the beams 62 in the circumferential direction of the pile 6 can be reduced. Between the two, it is possible to easily approach the gap generated between the pile 6 and the ground. Therefore, the filler 10 can be easily pressed into the gap without processing the block 60 and the beam 62. Since a part of the block 60 covers the gap, for example, if the jack 36 is disposed below the block 60, it is possible to obtain a reaction force for press-in from the block 60.

In some embodiments, the plurality of piles 6 are cast-in-place or pre-made piles.
In some embodiments, pre-made piles as piles 6 are embedded in pre-drilled holes.
In some embodiments, the prefabricated pile as the pile 6 is driven or pressed into the ground before or in parallel with the drilling of the hole.

In some embodiments, the filler 10 is pressed into the ground surface to a depth of 10 m or less.
For example, in the case of cast-in-place piles, the roundness of the hole is low, and the width of the gap produced by the earthquake may vary in the circumferential direction. In some embodiments, if the width of the gap is different in the circumferential direction, blocks 38 of different thickness are pressed in according to the width of the gap.
In some embodiments, four or more blocks 38 are press-fit in the circumferential direction if the width of the gap is circumferentially different.

  Finally, the present invention is not limited to the above-described embodiments, and includes the embodiments in which the above-described embodiments are modified, and the embodiments in which these embodiments are appropriately combined.

1 Structure 3 Pile Foundation Structure (Substructure)
5 superstructure 6 pile 8 connected body 10 filler 14 bag 16 inlet 18 sheet 20 fixing member 22 supply pipe 24 header pipe 26 branch pipe 28 pressure feeding device 30 pressure gauge 32 flow meter 34 control device 36 jack 38 block 40 convex portion 42 Recess 44 Pin 46 Hole 48 Bonding Layer 50 Footing 52 Seismic Isolation Device 54 Beam (Flat Beam)
56 opening 58 lid member 60 block (pile cap)
62 Beam (underground beam)
64 first side 66 second side

Claims (15)

A pile foundation repair method comprising a filler injection step of injecting a filler after the earthquake into a gap formed between a pile and a ground due to the earthquake,
A bag attachment step of attaching an inflatable bag by pressing the filler material on one end side of the pile;
A pile installation step of installing the pile so that the bag body is buried in the ground;
A piping process of piping a supply pipe for supplying a filler to the bag body;
And further
In the filler press fitting process, pile foundation repair how to and supplying the filler to the bag through the feed tube. The plurality of bag bodies are concentrically attached to the pile so as to overlap in the radial direction of the pile in the bag body attaching process,
Piles repair method according to claim 1, characterized in that press-fitting the filler to one or of the plurality of bag in the filler press fitting process. Attaching the bag body to each of the plurality of piles in the bag body attaching step;
In the piping step, a header pipe and a plurality of branch pipes are prepared as the supply pipe, and the bag attached to each of the plurality of piles and the header pipe are connected by the branch pipe,
The pile foundation according to claim 1 or 2 , wherein, in the filling material pressing step, the filling material is simultaneously filled in the bag body attached to each of the plurality of piles through the header pipe and the branch pipe. Repair method. A pile foundation repair method comprising a filler injection step of injecting a filler after the earthquake into a gap formed between a pile and a ground due to the earthquake,
Embedding the pile in the ground;
Providing a beam to surround the head with an opening between the pile and the head;
Equipped with
In the filler press fitting process, pile foundation repair how to characterized by press-fitting the filler through said opening using a jack gap between the pile and the ground.   A pile foundation repair method comprising a filler injection step of injecting a filler after the earthquake into a gap formed between a pile and a ground due to the earthquake,
  Embedding the pile in the ground;
  Providing a pile cap enclosing a top end of the pile and having a plurality of first sides orthogonal to one another;
  Providing a plurality of beams each extending horizontally from the plurality of first side surfaces;
Equipped with
  The pile cap further includes at least one second side surface having a normal direction different from the normal direction of the plurality of first side surfaces between the plurality of first side surfaces in the circumferential direction of the vertical axis. ,
  In the filler injection step, the filler is injected from between the beams.
Pile foundation repair method characterized by Piles buried in the ground,
A bag which is embedded in the ground in a state of being attached to the pile so as to surround the upper end side of the pile, and into which the filling material is press-fit after an earthquake .
Pile foundation structure characterized by having. The pile foundation structure according to claim 6, further comprising a supply pipe for supplying a filler to the bag body. The plurality of piles are buried in the ground,
The bag is attached to each of the plurality of stakes,
The supply pipe includes a header pipe and a plurality of branch pipes connected to the header pipe,
The pile foundation structure according to claim 7, wherein the header pipe communicates with a plurality of the bag bodies via the plurality of branch pipes. Piles buried in the ground,
A beam provided so as to surround the head in a state where an opening is present between the pile and the head;
A plurality of lid members removably disposed between the head and the beam so as to close the opening;
A pile foundation structure characterized in that the opening has a size capable of press-fitting a filler after the earthquake into a gap generated between the pile and the ground by the earthquake. Piles buried in the ground,
A pile cap surrounding a top end of the pile and having a plurality of first side faces orthogonal to each other;
A plurality of beams each extending horizontally from the plurality of first side surfaces,
The pile cap, while at the circumferential direction of the vertical axis of the plurality of first aspect, further have at least one second side with a different normal direction to the normal direction of the plurality of first side surface A pile foundation structure characterized in that it is possible to press-fit a filling material from between the beams after the earthquake into a gap generated between the pile and the ground by the earthquake . It is a pile foundation repair kit that can be press-fit after the earthquake into a gap created between the pile and the ground by the earthquake,
A pile foundation repair kit comprising: a plurality of blocks that can be arranged along the circumferential direction of the outer circumferential surface of the pile. The pile foundation repair kit according to claim 11, wherein the plurality of blocks are configured by a plurality of blocks that can be arranged in the circumferential direction of the outer circumferential surface of the pile and in the axial direction of the pile. The pile foundation repair kit according to claim 12, wherein the plurality of blocks arranged in the axial direction of the pile are mutually engageable. The pile foundation repair kit according to any one of claims 11 to 13, wherein the plurality of blocks arranged in the circumferential direction of the outer circumferential surface of the pile are connectable to each other. The pile foundation repair kit according to any one of claims 11 to 14, wherein at least a part of the plurality of blocks has a wedge-shaped cross-sectional shape.

Images