JP6799287B2 - Pile support structure and its pile head joining method - Google Patents

Description

The present invention relates to a pile support structure such as a pier in which a precast concrete member is supported by a steel pipe pile, and a method for joining the pile head.

A pile support structure such as a pier includes a plurality of steel pipe piles cast on the bottom ground and a concrete beam portion supported by the steel pipe pile, and a concrete slab is formed on the beam portion.

Conventionally, for concrete beams, after each steel pipe pile is placed, steel pipes are installed between adjacent steel pipe piles, reinforcing bars are arranged, and steel pipes are supported by supporting the steel pipe piles. A formwork was formed between the piles, and concrete was cast in place to form a beam part, which was joined to the pile head of the steel pipe pile.

However, in such a construction method, since the beam part is formed of cast-in-place concrete, installation of work scaffolding and support work for each work, arrangement of reinforcing bars and steel frames, assembly and dismantling of formwork, and placing of concrete. -All the work such as curing had to be done at sea, and there was a problem that the influence of sea conditions and weather conditions was large and the construction period was prolonged.

Therefore, in view of such a problem, conventionally, one or a plurality of precast concrete ready-made members constituting a beam are manufactured in advance at a factory or a manufacturing yard on land, transported to a construction site, and a head of a steel pipe pile. A construction method is used in which the ready-made member is supported by the portion, and concrete is cast between the pile head and the ready-made member in that state to join the ready-made member (see, for example, Patent Document 1).

In this type of construction method, for example, a sheath pipe that is one size larger than the steel pipe pile and a support member made of H steel that crosses the inside of the sheath pipe are provided in the ready-made member, and the support member is supported on the pile head of the steel pipe pile. It is known that the ready-made member is temporarily supported by the steel pipe pile, and the ready-made member is joined to the pile head by filling a grout between the sheath pipe and the steel pipe pile in that state. ..

On the other hand, in pile support structures such as piers, the portion of the steel pipe pile at a certain height above the water surface is always exposed to droplets of chloride and the like. Therefore, conventionally, polyethylene is provided in a certain range from the upper end of the steel pipe pile on land. A heavy anticorrosive coating made of or urethane elastomer is provided, and a steel pipe pile is placed in that state to protect the splashed portion with the heavy anticorrosive coating.

In addition, in pile support structures such as piers, when the piles deteriorated, the splash zone at the upper end of the severely damaged steel pipe piles was cut, and the concrete superstructure supported by the steel pipe piles was dismantled and removed. Later, a construction method was also developed in which a ready-made member made of precast concrete was newly joined to the head of the remaining steel pipe pile to form a beam.

Japanese Unexamined Patent Publication No. 2001-288725

However, with the conventional technology as described above, it is difficult to apply a heavy anticorrosion coating to the steel pipe pile after installation, and in particular, when reconstructing an aged pier or the like, the steel pipe pile after cutting the splashed portion It was difficult to apply a heavy anticorrosion coating.

On the other hand, when a heavy anticorrosion coating is applied to the upper end of a steel pipe pile on land in advance, the position of the heavy anticorrosion coating with respect to the water surface depends on the pile head end level of the steel pipe pile. There was a risk that the coating would not be placed in the proper position corresponding to the splashed part.

Therefore, in view of such conventional problems, the present invention has been made for the purpose of providing a pile support structure in which a heavy anticorrosion coating is arranged at an appropriate position of a steel pipe pile and a method for joining the pile head. ..

The feature of the invention according to claim 1 for solving the above-mentioned conventional problems is that the precast member is provided with a precast member supported by a steel pipe pile, and the precast member is a precast member main body having a pile insertion portion opened on the lower surface. A sheath pipe supported inside the pile insertion portion and a support member projecting into the sheath pipe are provided, and the sheath pipe and the pile head of the steel pipe pile are fitted together with the support member. In a pile support structure in which is supported by the pile head of a steel pipe pile and a filler is placed between the sheath pipe and the pile head, the sheath pipe is a precast member main body. A heavy anticorrosion coating is formed on the outer periphery of the overlapping protrusions so as to project from the lower surface, and the precast member includes a mold support member arranged in the sheath tube and the mold support member in the sheath. A support piece supported by a pipe and a bottom mold supported at the lower end of the mold support member were provided, and the sheath pipe was fitted to the outside of the pile head and inserted into the steel pipe pile. It is in a pile support structure in which a predetermined position of the steel pipe pile is closed by the bottom mold and filled concrete is placed in the steel pipe pile .

The feature of the invention described in claim 2 is that, in addition to the configuration of claim 1, the precast member main body has a central support portion having the pile insertion portion and one or a plurality of protrusions outward from the central support portion. It is composed of a cantilever for beams.

The feature of the invention according to claim 3 is that the precast member is supported by a steel pipe pile, and the precast member is supported inside the precast member main body having a pile insertion portion opened on the lower surface and the inside of the pile insertion portion. The sheath pipe and the support member protruding into the sheath pipe are provided, and the sheath pipe and the pile head of the steel pipe pile are fitted, and the support member is supported by the pile head of the steel pipe pile. In a pile support structure in which a filler is placed between the sheath pipe and the pile head, the sheath pipe includes an overlapping protruding portion protruding from the lower surface of the precast member main body. A heavy anticorrosion coating is formed on the outer periphery of the overlapping protruding portion, and the pile head is provided with a pair of receiving recesses into which the support member is fitted, and each receiving recess is an introduction portion opened at the upper end of the steel pipe pile. The support member is inserted into the receiving recess through the introduction portion, and the precast member is rotated around the pile axis. The bottom portion of the introduction portion and the engagement notch portion continuous in the circumferential direction are provided. It is inserted into the engagement notch portion by the means of the pile so as to be engaged with the pile head of the steel pipe pile .

The feature of the invention according to claim 4 is that a precast member having a sheath pipe is used, the sheath pipe and the pile head of a steel pipe pile are fitted, and a support member protruding into the sheath pipe is used as the pile head. In the pile head joining method of a pile support structure in which a filler is placed between the sheath pipe and the pile head and the precast member is joined to the pile head, the precast member is joined. Includes a mold support member arranged in the sheath pipe, a support piece in which the mold support member is supported by the sheath pipe, and a bottom mold supported by the lower end of the mold support member. In addition, the sheath pipe is provided with an overlapping protruding portion protruding from the lower surface of the precast member main body, and a heavy anticorrosion coating is formed in advance on the outer periphery of the overlapping protruding portion, and the sheath pipe is formed on the pile head of the steel pipe pile. By fitting to the outside of the steel pipe pile, the splashed portion of the steel pipe pile is covered with the heavy anticorrosion coating, and the bottom mold is inserted into the steel pipe pile to close a predetermined position of the steel pipe pile. Later, there is a method of joining the pile heads of a pile support structure in which filled concrete is placed in the steel pipe pile .

The feature of the invention according to claim 5 is that, in addition to the configuration of claim 4, the upper end of the existing steel pipe pile is cut, the existing superstructure supported by the existing steel pipe pile is removed, and then the precast member is moved. , The sheath pipe is fitted to the outside of the pile head of the existing steel pipe pile, and the support member protruding into the sheath pipe is supported by the pile head, and then between the sheath pipe and the pile head. The purpose is to cast a filler and join the precast member to the pile head of the existing steel pipe pile.

The feature of the invention according to claim 6 is that a precast member having a sheath pipe is used, the sheath pipe and the pile head of a steel pipe pile are fitted, and a support member protruding into the sheath pipe is used as the pile head. In the pile head joining method of a pile supporting structure in which a filler is placed between the sheath pipe and the pile head and the precast member is joined to the pile head, the precast member is joined. The sheath tube is provided with an overlapping projecting portion protruding from the lower surface of the precast member main body, and a heavy anticorrosion coating is formed in advance on the outer periphery of the overlapping projecting portion, and the support member is fitted to the pile head. Each receiving recess is provided with a pair of receiving recesses to be inserted, and each receiving recess is provided with an introduction portion opened at the upper end of the steel pipe pile and an engaging notch portion continuous with the bottom portion of the introduction portion in the circumferential direction. By fitting it to the outside of the pile head of the steel pipe pile, the splashed portion of the steel pipe pile is covered with the heavy anticorrosion coating, and the support member is inserted into the receiving recess through the introduction portion to form the precast member. The purpose is to insert the support member into the engagement notch by rotating it around the pile axis and engage it with the pile head of the steel pipe pile .

As described above, the pile support structure according to the present invention includes a precast member supported by a steel pipe pile, and the precast member includes a precast member main body having a pile insertion portion opened on the lower surface and a pile insertion portion. A sheath pipe supported inward and a support member protruding into the sheath pipe are provided, and the sheath pipe and the pile head of the steel pipe pile are fitted, and the support member is the pile head of the steel pipe pile. In a pile support structure in which a filler is driven between the sheath pipe and the pile head, the sheath pipe is a overlapping protruding portion protruding from the lower surface of the precast member main body. Since the heavy anticorrosion coating is formed on the outer periphery of the overlapping protruding portion, the heavy anticorrosion coating can be provided at a desired height without being affected by the pile head end level or the like of the steel pipe pile. In addition, since the sheath pipe can counter the pile head moment and the influence of the maximum pile head moment can be eliminated, the performance of the steel pipe pile can be suppressed by that amount, and the cost can be reduced.

Further, in the present invention, the precast member main body is composed of a central support portion having the pile insertion portion and one or a plurality of beam cantilever portions protruding outward from the central support portion. , A beam portion having an arbitrary shape can be formed by combining precast members.

Further, in the present invention, the pile head is provided with a pair of receiving recesses into which the support member is fitted, and each receiving recess has an introduction portion opened at the upper end of the steel pipe pile and a bottom portion of the introduction portion. The support member is inserted into the receiving recess through the introduction portion, and the precast member is rotated around the pile axis to enter the engaging notch portion. By being inserted and engaging with the pile head of the steel pipe pile, even when the center of gravity of the precast member is biased, it can be stably temporarily supported by the pile head.

Further, using a precast member having a sheath pipe, the sheath pipe and the pile head of the steel pipe pile are fitted, and the support member protruding into the sheath pipe is supported by the pile head, and then the sheath pipe is used. In the pile head joining method of a pile support structure in which a filler is placed between the pile head and the pile head and the precast member is joined to the pile head, the precast member is a precast member to the sheath pipe. By providing an overlapping projecting portion protruding from the lower surface of the main body, a heavy anticorrosion coating is formed in advance on the outer periphery of the overlapping projecting portion, and the sheath pipe is fitted to the outside of the pile head of the steel pipe pile. By covering the splashed portion of the steel pipe pile with the heavy anticorrosion coating, the heavy anticorrosion coating can be easily applied to the pile head.

Further, in the present invention, after cutting the upper end of the existing steel pipe pile and removing the existing superstructure supported by the existing steel pipe pile, the precast member is moved and the sheath pipe is moved to the pile head of the existing steel pipe pile. After fitting to the outside and supporting the support member protruding into the sheath pipe to the pile head, a filler is placed between the sheath pipe and the pile head, and the pile of the existing steel pipe pile is placed. By joining the precast member to the head, when reconstructing a pile support structure such as an aged pier, it is possible to easily apply a heavy corrosion protection coating at a predetermined position regardless of the cutting position of the steel pipe pile. it can.

Furthermore, in the present invention, the precast member is attached to a formwork support member arranged in the sheath tube, a support piece in which the formwork support member is supported by the sheath tube, and a lower end of the formwork support member. By providing a supported bottom formwork and fitting the sheath pipe to the outside of the pile head, the bottom formwork is inserted into the steel pipe pile and closes a predetermined position of the steel pipe pile. After that, by placing the filling concrete in the steel pipe pile, the formwork for placing the filling concrete can be installed together with the installation of the sheath pipe, and the construction period can be shortened. ..

It is a front view which shows the outline of the pile support structure which concerns on this invention. FIG. 5 is a cross-sectional view taken along the line AA showing the beam portion in FIG. It is an enlarged vertical sectional view which shows the state of pile head joint in FIG. It is an enlarged vertical sectional view which shows the precast member of the same above. An enlarged plan view showing a pile head of a steel pipe pile in FIG. 1, (b) is an enlarged front view of the same part, and (c) is a sectional view taken along line BB. It is sectional drawing which shows the attachment process of the precast member of the same above. It is a top view which shows the state of the precast member at the time of the same attachment. It is sectional drawing which shows the pile support structure which concerns on this invention and another Example of the pile head joining method.

Next, an embodiment of the pile support structure 1 according to the present invention will be described based on the examples shown in FIGS. 1 to 5. Reference numeral 1 in the drawing is a pile support structure such as a pier.

As shown in FIG. 1, the pile support structure 1 includes a plurality of steel pipe piles 3, 3 ... cast in the bottom ground 2 and a precast member 4 supported by the steel pipe piles 3, 3 ... A beam portion 5 composed of, 4 ... Is provided, and a floor slab portion 6 is formed on the beam portion 5.

As shown in FIG. 2, the beam portion 5 includes a plurality of precast members 4, 4 ... And a cast-in-place concrete portion 7 for connecting the precast members 4, 4 ..., And is formed in a grid pattern. Has been done.

As shown in FIG. 3, the precast members 4, 4 ... Have a precast member main body 9 having a pile insertion portion 8 having an open lower surface at least, a sheath pipe 10 supported inside the pile insertion portion 8, and the sheath pipe 10. A support member 11 protruding into the sheath pipe 10 is provided, and the support member 11 is temporarily supported by being supported by the pile heads of the steel pipe piles 3, 3 ..., And the sheath pipe 10 and the pile head are fitted to each other. A filler 12 such as a grout is placed between the portion and the pile head to be joined to the pile head.

Further, in the pile support structure 1, the filling concrete 13 is cast from the upper ends of the steel pipe piles 3, 3 ... To a desired depth.

The precast member main body 9 is composed of a central support portion 9a having a pile insertion portion 8 and one or a plurality of beam cantilever portions 9b protruding outward from the central support portion 9a, and each has an L-shape in a plan view. It is formed in a T-shape or a cross shape.

Then, the beam portion 5 is a combination of L-shaped, T-shaped, and cross-shaped precast members 4, 4 ... in a plan view, and concrete is cast in place between the cantilever portions 9b and 9b for the beam. , The cantilevered portions 9b and 9b for beams are connected to form a grid.

The sheath tube 10 is formed longer than the height (thickness in the vertical direction) of the precast member main body 9, and is integrated with the precast member main body 9 in a state where the upper end thereof is inserted into the pile insertion portion 8.

Further, the sheath tube 10 includes an overlapping projecting portion 10a projecting from the lower surface of the precast member main body 9, and a heavy anticorrosion coating 15 is formed on the outer periphery of the overlapping projecting portion 10a.

The heavy-duty anticorrosion coating 15 is composed of a heavy-duty anticorrosion coating material made of polyethylene, urethane elastomer, or the like, and the entire outer circumference of the overlapping protrusion 10a or the outer periphery of a certain range from the lower end of the overlapping protrusion 10a is covered by the heavy-duty coating material. Has been done.

The height of the overlapping protrusion 10a is the driving depth of the steel pipe piles 3, 3 ..., the water surface protrusion height at high tide and low tide of the steel pipe piles 3, 3 ..., and the pile head required for design. Determined based on the length that satisfies the moment.

The support member 11 is made of H-shaped steel or the like, is arranged so as to cross the inside of the sheath pipe 10 in the diameter direction at a predetermined height from the lower end of the sheath pipe 10, and is fixed by welding.

Then, when the support member 11 engages with the receiving recess 16 formed in the pile head of the steel pipe piles 3, 3 ..., the precast members 4, 4 ... Are made into the steel pipe pile via the sheath pipe 10. It is temporarily supported by the pile head of 3.

As shown in FIG. 5, the receiving recess 16 is formed at positions symmetrical with respect to the heads of the steel pipe piles 3, the introduction portion 20 opened at the upper ends of the steel pipe piles 3, 3 ..., And the bottom portion of the introduction portion 20. And an engaging notch 21 continuous in the circumferential direction.

Then, the support member 11 is inserted into the receiving recess 16 through the introduction portion 20 when the sheath pipe 10 is fitted to the outside of the steel pipe piles 3, 3 ..., and the precast members 4, 4 ... Are around the pile axis. It is inserted into the engaging notch 21 by rotating the steel pipe pile 3, 3 ..., And is engaged with the upper inner edge 21a of the engaging notch 21, that is, the pile head of the steel pipe piles 3, 3 ...

The receiving recess 16 may be provided with an adjusting raising portion 22 as necessary in order to correct the level adjustment and rattling when the bearing member 11 is engaged.

As shown in FIG. 5, the adjustment raising portion 22 includes a slope portion 22a inclined upward from the introduction portion 20 side to the engaging notch portion 21 side, and is integrated with the lower edge of the receiving recess 16 by welding. ..

Since the height of the steel pipe piles 3, 3 ... projecting from the water surface differs depending on the pile head end level, the height of the adjusting raising portion 22 provided on each of the steel pipe piles 3, 3 ... By adjusting, the mounting position of the sheath pipe 10 with respect to each of the steel pipe piles 3, 3 ... Can be adjusted, thereby unifying the position of the overlapping protruding portion 10a and arranging the heavy anticorrosion coating 15 on the splashed portion. It has become so.

Further, the precast members 4, 4 ... Are a formwork support member 23, 23 arranged in the sheath tube 10, a support piece 24 in which the formwork support member 23, 23 is supported by the sheath tube 10, and a mold. When the bottom form 25 supported at the lower ends of the frame support members 23, 23 is provided and the sheath pipe 10 is fitted to the outside of the steel pipe piles 3, 3 ..., the form support members 23, 23 are made of steel pipe. By being inserted into the piles 3, 3 ..., the bottom formwork 25 is arranged at a predetermined height from the upper end of the steel pipe piles 3, 3 ..., and the inside of the steel pipe piles 3, 3 ... Is closed. I am trying to do it.

Next, the pile head joining method of the pile support structure 1 as described above will be described with reference to FIGS. 6 and 7. The same configuration as in the above-described embodiment will be described with the same reference numerals, and the reference numerals are steel pipe piles 3, 3 ... Driven into the bottom ground 2.

Since the height of the steel pipe piles 3, 3 ... projecting from the water surface differs depending on the pile head end level, the level of the receiving recess 16 formed in the pile head 3 head, specifically, the adjustment raising. The level is adjusted according to the height of the portion 22.

Next, the precast members 4, 4 ... Are transferred to the construction site by a crane ship or the like, and as shown in FIGS. 6A to 6B, the precast members 4,4 ... Are transferred by a crane. Lifting and mounting of steel pipe piles 3, 3 ... to the pile head are started.

At that time, the precast members 4, 4 ... Are rotated by a predetermined angle around the pile axis with respect to the actual mounting position, and the circumferential position of the bearing member 11 is set to the pile head of the steel pipe piles 3, 3 ... It is hung in a state of being aligned with the position of the introduction portion 20 of the receiving recess 16 formed in.

Then, when the sheath pipe 10 is fitted to the outside of the pile heads of the steel pipe piles 3, 3 ..., The support member 11 is pressed against the lower edge of the receiving recess 16 through the introduction portion 20, and the bottom form 25 Is inserted into the steel pipe piles 3, 3 ... and closes the predetermined positions of the steel pipe piles 3, 3 ...

Next, the precast members 4, 4 ... Are rotated in the pile axis direction from the position shown in FIG. 7A to the position shown in FIG. 7B, and the bearing member 11 is inserted into the engaging notch 21. , Engage with the upper inner edge of the engagement notch 21, that is, the pile head of the steel pipe piles 3, 3 ...

At that time, by providing the adjustment raising portion 22, the bearing member 11 is guided by the slope portion and moves onto the raising portion 22, level adjustment and rattling are corrected, and the engaging notch portion is in a stable state. Engage with 21.

The precast members 4, 4 ... Are provided with one or a plurality of cantilever portions 9b for beams in the precast member main body 9, and since the center of gravity is biased, a moment acts on the support member 11 as an axis. ..

However, the precast members 4, 4 ... Are temporarily supported by the pile head in a stable state by suppressing the moment due to the eccentricity by engaging the bearing member 11 with the engaging notch 21.

Next, as shown in FIG. 6C, with the precast members 4, 4 ... Temporarily supported by the pile head, the gap between the sheath pipe 10 and the steel pipe piles 3, 3 ... Is filled with a filler 12 such as grout, and the precast members 4, 4 ... Are joined to the pile heads of the steel pipe piles 3, 3 ...

Further, as shown in FIG. 6D, the filling concrete 13 is cast from the upper end of the pile insertion portion 8 by cast-in-place concrete to complete the installation of the precast members 4, 4 ...

Then, after performing the above-mentioned joining work of the precast members 4, 4 ... For each of the steel pipe piles 3, 3 ..., a reinforcing bar or the like is arranged between the adjacent beam cantilever portions 9b, and the formwork is formed. It is installed and cast-in-place concrete is cast to form a cast-in-place concrete portion 7 that connects the precast members 4, 4 ...

Then, by curing and solidifying the cast-in-place concrete, a grid-like beam portion 5 supported by the steel pipe piles 3, 3 ... Is formed, and by installing the cast-in-place concrete or the precast floor plate on the beam portion 5. A floor slab is installed and a pile support structure 1 is constructed.

The method of joining the pile head of the pile support structure 1 is not limited to the above-described embodiment. For example, as shown in FIG. 8, the precast member main body 9 and the sheath pipe 10 are separately prepared and the steel pipe is prepared. It may be joined to piles 3, 3 ...

In this construction method, a rectangular fitting recess 30 opened upward is formed at the upper end of the sheath pipe 10, and the support member 31 is formed in the precast member main body 9 so as to cross the inside of the pile insertion portion 8 penetrating vertically. Is installed. Further, a rectangular fitting recess 32 having an opening on the upper side is also formed in the steel pipe piles 3, 3 ...

Then, first, the sheath pipe 10 is fitted to the outside of the steel pipe piles 3, 3 ..., the support member 11 is fitted into the fitting recess 32 at the upper end of the steel pipe piles 3, 3 ..., and the sheath pipe 10 is fitted. The supported bottom mold 25 is inserted into the steel pipe pile 3.

In this state, since the sheath pipe 10 and the precast member main body 9 are separated, the sheath pipe 10 is supported by the steel pipe pile 3 in a stable state.

Then, in this state, the space between the sheath pipe 10 and the steel pipe piles 3, 3 ... Is filled with a filler 12 such as grout, and the filled concrete 13 is placed in the steel pipe, and the sheath pipe 10 is made of the steel pipe pile. Join to 3, 3 ...

Next, the precast member main body 9 is lifted by a crane or the like and fitted to the upper end portion of the sheath pipe 10, so that the support member 11 of the precast member main body 9 is fitted into the fitting recess, and the precast member main body is fitted through the sheath pipe 10. 9 is supported by steel pipe cranes 3, 3 ...

Then, in this state, the inner surface of the pile insertion portion 8 and the sheath pipe 10 are filled with grout or the like, and the filled concrete 13 is cast in the sheath pipe 10 to join the sheath pipe 10 and the precast member main body 9. By doing so, the installation of the precast members 4, 4 ... Is completed.

Further, the present invention can be applied to the reconstruction of a pile support structure 1 such as an aged pier, and the upper ends of the existing steel pipe piles 3, 3 ... Are cut to form the existing steel pipe piles 3, 3 ... After removing the supported existing superstructure, a new superstructure can be formed on the existing steel pipe piles 3, 3 ... by installing the precast members 4, 4 ... As in the above embodiment. ..

In the pile support structure 1 configured in this way, the pile head moment can be countered by fitting the sheath pipe 10 to the pile heads of the steel pipe piles 3, 3 ... Therefore, the steel pipe piles 3, 3 ... In the design of 3 ..., the influence of the maximum pile head moment can be eliminated, and the cost can be reduced accordingly.

Further, in the pile support structure 1, since the sheath pipe 10 is provided with the overlapping protruding portion 10a and the heavy anticorrosion coating 15 is formed on the outer periphery thereof, the pile head end portion level of the steel pipe piles 3, 3 ... Even if there is an error with the design value, the heavy anticorrosion coating 15 can be arranged at a desired position.

Further, even when the pile support structure 1 such as an aged pier is reconstructed, the heavy corrosion protection coating 15 can be easily formed on the splashed portion.

1 Pile support structure 2 Underwater ground 3 Steel pipe pile 4 Precast member 5 Beam part 6 Floor slab part 7 Cast-in-place concrete part 8 Pile insertion part 9 Precast member body 10 Sheath pipe 11 Bearing member 12 Filling material 13 Filling concrete 15 Heavy corrosion protection Coating 16 Receiving recess 20 Introducing part 21 Engagement notch part 22 Adjusting raised part 23 Formwork support member 24 Support piece 25 Bottom formwork

Claims (6)

Equipped with precast members supported by steel pipe piles,
The precast member includes a precast member main body having a pile insertion portion opened on the lower surface, a sheath tube supported inside the pile insertion portion, and a support member protruding into the sheath tube, and the sheath tube and the said. The pile head of the steel pipe pile is fitted, the support member is supported by the pile head of the steel pipe pile, and a filler is placed between the sheath pipe and the pile head. In the pile support structure
The sheath tube is provided with overlapping protrusions protruding from the lower surface of the precast member main body, and a heavy anticorrosion coating is formed on the outer periphery of the overlapping protrusions .
The precast member includes a formwork support member arranged in the sheath tube, a support piece in which the formwork support member is supported by the sheath tube, and a bottom formwork supported by the lower end of the formwork support member. With
The sheath pipe is fitted to the outside of the pile head, and the bottom formwork inserted into the steel pipe pile closes a predetermined position of the steel pipe pile.
A pile support structure characterized in that filled concrete is cast in the steel pipe pile . The pile support according to claim 1, wherein the precast member main body is composed of a central support portion having the pile insertion portion and one or a plurality of cantilever portions for beams protruding outward from the central support portion. Structure. Equipped with precast members supported by steel pipe piles,
The precast member includes a precast member main body having a pile insertion portion opened on the lower surface, a sheath tube supported inside the pile insertion portion, and a support member protruding into the sheath tube, and the sheath tube and the said. The pile head of the steel pipe pile is fitted, the support member is supported by the pile head of the steel pipe pile, and a filler is placed between the sheath pipe and the pile head. In the pile support structure
The sheath tube is provided with overlapping protrusions protruding from the lower surface of the precast member main body, and a heavy anticorrosion coating is formed on the outer periphery of the overlapping protrusions.
The pile head is provided with a pair of receiving recesses into which the bearing members are fitted, and each receiving recess is continuous with an introduction portion opened at the upper end of the steel pipe pile and a bottom portion of the introduction portion in the circumferential direction. Equipped with an engaging notch
The bearing member is inserted into the receiving recess through the introduction portion, and is inserted into the engaging notch portion by rotating the precast member around the pile axis, and is engaged with the pile head of the steel pipe pile. A pile support structure characterized by the above. A precast member having a sheath pipe is used, the sheath pipe and a pile head of a steel pipe pile are fitted, and a support member protruding into the sheath pipe is supported by the pile head, and then the sheath pipe and the pile head are described. In the pile head joining method of a pile support structure in which a filler is placed between the pile head and the precast member is joined to the pile head.
The precast member includes a formwork support member arranged in the sheath tube, a support piece in which the formwork support member is supported by the sheath tube, and a bottom formwork supported by the lower end of the formwork support member. The sheath tube is provided with an overlapping projecting portion protruding from the lower surface of the precast member main body, and a heavy anticorrosion coating is formed in advance on the outer periphery of the overlapping projecting portion.
By fitting the sheath pipe to the outside of the pile head of the steel pipe pile, the splashed portion of the steel pipe pile is covered with the heavy anticorrosion coating, and the bottom mold is inserted into the steel pipe pile. A method for joining pile heads of a pile support structure , which comprises closing a predetermined position of a steel pipe pile and then placing filled concrete in the steel pipe pile . After cutting the upper end of the existing steel pipe pile and removing the existing superstructure supported by the existing steel pipe pile, the precast member is moved and the sheath pipe is fitted to the outside of the pile head of the existing steel pipe pile. After the support member protruding into the sheath pipe is supported by the pile head, a filler is placed between the sheath pipe and the pile head, and a precast member is placed on the pile head of the existing steel pipe pile. The method for joining pile heads of a pile support structure according to claim 4. A precast member having a sheath pipe is used, the sheath pipe and the pile head of a steel pipe pile are fitted, and a support member protruding into the sheath pipe is supported by the pile head, and then the sheath pipe and the pile head are described. In the pile head joining method of a pile support structure in which a filler is placed between the pile head and the precast member is joined to the pile head.
The precast member is provided with an overlapping protruding portion protruding from the lower surface of the precast member main body in the sheath tube, and a heavy anticorrosion coating is formed in advance on the outer periphery of the overlapping protruding portion.
The pile head is provided with a pair of receiving recesses into which the bearing members are fitted, and each receiving recess is engaged with an introduction portion opened at the upper end of the steel pipe pile and a bottom portion of the introduction portion in the circumferential direction. With a notch,
By fitting the sheath pipe to the outside of the pile head of the steel pipe pile, the splashed portion of the steel pipe pile is covered with the heavy anticorrosion coating and at the same time.
The bearing member is inserted into the receiving recess through the introduction portion, and the precast member is rotated around the pile axis to insert the bearing member into the engaging notch and engage with the pile head of the steel pipe pile. A method of joining pile heads of a pile support structure, which is characterized in that the pile heads are joined.

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