JP2000220140A - Cast-in-place steel pipe concrete pile and its erecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily connect a cage and a steel pipe and contrive the reduction of labors and costs and the reduction of a construction period by inserting steel pipe connected to the cages in a shaft, and providing an opening and closing means for opening and closing an edge opening part. SOLUTION: A cover plate 8 is provided on an opening part 7a to be welded on a bottom plate 6 by a connection member on the outer periphery, and the vertical bar 4a of a cage 4 and the connection member of a steel pipe 5 are overlapped to be tied by a wire or the like. During execution, an integrated vertical bar 4a and the connection member is inserted in a shaft 2, and a tremie pipe is inserted in the cage 4 from the opening part 7a of the cover plate 8 of the bottom plate 6 of the steel pipe 5. Next, the level of cast-in-place concrete 22 is charged down to the neighborhood of the bottom plate 6 in the shaft 2 to pull out the tremie pipe so as to block the opening part 7a by the cover plate 8, and a casing 20 is pulled out from the upper part of the shaft 2. A column material 40 is set up in the steel pipe 5, filling concrete 23 is charged in the steel pipe 5, and an outer periphery is filled with concrete 24 to complete steel pipe pile 1. Thereby a time and a cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cast-in-place steel pipe concrete pile in which a steel cage and a steel pipe connected to the steel cage are inserted into a pit, and concrete is filled into the pit to form the pile. .

[0002]

2. Description of the Related Art Cast-in-place steel pipe concrete piles, which have better shear resistance and bending resistance during an earthquake than reinforced concrete piles, have a steel pipe filled with cast-in-place concrete by inserting a steel bar and a steel pipe connected to the steel pipe. Within the building, a pillar structure such as a steel pipe column or a steel frame column, which is the upper structure, is built, and then concrete is filled, and the cast-in-place steel pipe concrete pile and the column material are integrated to improve the seismic resistance. Has recently attracted attention.

FIG. 16 is an explanatory view of one example of a conventional cast-in-place steel pipe concrete pile. In the figure, 42 is a pit (hole) excavated in the ground, 44 is a reinforced cage formed by binding rebars,
Reference numeral 5 denotes a steel pipe, and a plurality of rebars of a rebar cage 44 are integrally connected to each other by welding at a lower portion thereof. The integrated reinforced cage 44 and the steel pipe 45 were inserted into the pit 42 and cast in place with concrete 47 by a tremy tube or the like, and the concrete 47 was filled inside and outside. The cast-in-place steel pipe concrete pile 41 is formed by the steel pipe 45.

[0004]

In the above-mentioned conventional cast-in-place steel pipe concrete pile 41, after the concrete 47 is filled, muddy water or concrete 47 and muddy water are mixed in the upper part of the steel pipe 45 and in the vicinity thereof. There is poor quality concrete (hereinafter referred to as bad concrete) 48 containing impurities that are not desirable for concrete such as combined slime.

Therefore, after the concrete 47 is solidified,
The concrete having a depth of about 1 m above the steel pipe 45 was removed. This operation is generally called pile head processing. Such a pile head treatment requires not only a very large amount of labor and time, but also a steel pipe 45 when removing concrete.
There is a problem such as damage to the concrete or poor adhesion of the concrete adhering to the inner surface of the steel pipe 45 with the concrete to be filled after the column material is built due to incomplete removal of the concrete adhering to the inner surface of the steel pipe 45. Was.

Further, the reinforcing bars of the reinforcing bar cage 44 are joined to the steel pipes 45 by welding. In order to perform such welding work at the construction site, a welding device must be carried into the construction site. It took a lot of time for welding. As described above, the conventional cast-in-place steel pipe concrete pile 41 requires a great deal of labor and cost for the construction, and the prolonged construction period is inevitable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and eliminates the processing of pile heads and connects a steel cage and a steel pipe by simple means, thereby reducing labor and cost and shortening the construction period. It is an object of the present invention to obtain a highly reliable cast-in-place steel pipe concrete pile that can be measured and a method of constructing the same.

[0008]

(1) A cast-in-place steel pipe concrete pile according to the present invention is constructed by inserting a steel cage and a steel pipe connected to the steel cage into a pit, and filling the pile with concrete. In doing so, an opening and closing means for opening and closing the tip opening is provided at the tip of the steel pipe.

(2) The tip of the steel pipe of (1) was formed in a funnel shape. (3) Precast concrete was provided on all or a part of the inner wall of the steel pipe of the above (1) or (2) in the pipe axis direction.

(4) In the cast-in-place steel pipe concrete pile according to the present invention, the steel pipe and the steel pipe connected to the steel cage are inserted into the pit, and when the pit is filled with concrete, the steel pipe has an inner wall. A precast concrete steel pipe in which precast concrete is provided in all or a part of the pipe axis direction is used.

(5) A plurality of connecting members are provided at the tip of the steel pipe or the precast concrete according to any one of the above-mentioned items 1 to 4, which are connected to the reinforcing bar by securing or the like.

(6) In the method for constructing a cast-in-place steel pipe concrete pile according to the present invention, a step of connecting a reinforcing member and a connecting member provided on a steel pipe at a site by securing them or the like, and integrating the steps. Inserting the reinforced cage and the steel pipe into the pit, inserting the tremy pipe into the reinforced basket from the tip opening of the steel pipe, introducing concrete into the pit while gradually pulling up the tremy pipe, When the level of the concrete filled in reaches the vicinity of the tip of the steel pipe, stop charging the concrete and pull up the tremie pipe, and closing the tip opening by opening and closing means provided at the tip of the steel pipe, Filling concrete inside the steel pipe and the outer periphery of the steel pipe.

(7) As the steel pipe of (6), a precast concrete steel pipe in which precast concrete is provided on all or a part of the inner wall in the pipe axis direction is used.

[0014]

[First Embodiment] FIG. 1 is an explanatory diagram of a cast-in-place steel pipe concrete pile according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes a cast-in-place steel pipe concrete pile formed in the ground, reference numeral 4 denotes a steel cage incorporating a vertical bar 4a and a band bar 4b, and reference numeral 5 denotes a steel pipe.

As shown in FIG. 2, the steel pipe 5 has a bottom plate 6 having a central opening 7a joined to the distal end opening 7 by welding. The opening 7a is opened and closed via a hinge. A cover plate 8 as a means is provided so as to be openable and closable.
Reference numeral 9 denotes an outer periphery of the opening 7a, which is made of, for example, a reinforcing bar.
And a plurality of (only two are shown in the figure) connecting members protruding downward and fixed to the bottom plate 6 by welding. Then, the vertical bar 4a of the reinforcing bar 4 and the connecting member 9 provided on the steel pipe 5 are overlapped with each other and fastened by a wire 9a, so that the reinforcing bar 4 and the steel pipe 5 are integrated. In addition, 2
Reference numeral 0 denotes a casing provided at the upper part of the pit 2.

Next, an example of the construction method of the present embodiment configured as described above will be described with reference to FIGS. (1) First, the connecting member 9 between the vertical bar 4a of the reinforcing bar 4 and the steel pipe 5
a is tied up with a wire or the like at the construction site and integrated.
As shown in FIG. (2) As shown in FIG. 3 (b), the cover plate 8 provided on the bottom plate 6 of the steel pipe 5 is opened, and the tremee is inserted into the reinforcing bar 4 from the opening 7a until the tip thereof reaches the vicinity of the bottom of the pit 2. The pipe 21 is inserted, and the cast-in-place concrete 22 is put into the pit 2 and gradually pulled up.

(3) Cast-in-place concrete 22 in the pit 2
When the level reaches the vicinity of the bottom plate 6 of the steel pipe 5, the casting of the cast-in-place concrete 22 is stopped,
As shown in FIG. 3C, the tremy tube 21 is pulled out, and the opening 7 a of the bottom plate 6 is closed by the cover plate 8. As a result, the cast-in-place concrete 22 is filled into the pit 2 below the steel pipe 5 in which the reinforcing steel cage 4 is disposed to form the cast-in-place concrete pile 3, and most of the defective concrete including slime and the like is removed from the steel pipe 5. And does not enter the steel pipe 5.

(4) Next, as shown in FIG.
The casing 20 is pulled out from the pit 2 and the column member 40 is placed in the steel pipe 5.
And the filling concrete 23 is filled in the steel pipe 5. In addition, the filling concrete 23 is filled in the steel pipe 5,
The column member 40 may be built before this solidifies.

(5) After the filled concrete 23 in the steel pipe 5 is solidified to some extent, as shown in FIG. 4 (b), when the outer periphery of the steel pipe 5 is filled with concrete 24, the cast-in-place steel pipe concrete pile 1 becomes Complete. After the concrete 24 is first filled in the outer periphery of the steel pipe 5, the steel pipe 5
The concrete 23 may be filled therein, but since the steel pipe 5 may float up in this case, it is desirable to fill the steel pipe 5 with the concrete 23 first.

According to the present embodiment configured as described above, since the defective concrete does not enter into the steel pipe 5, the pile head treatment can be omitted. Since the connection only needs to secure the reinforcing member 4a and the connecting member 9 provided on the steel pipe 5 with a wire 9a or the like, labor, time and cost can be significantly reduced, and the construction period is shortened. be able to.

[Embodiment 2] In this embodiment, FIGS.
FIG. 11 shows another example of the structure of the steel pipe 5, in particular, the structure of the bottom and the means for opening and closing the opening provided in the bottom. In the above-described first embodiment, a case is shown in which a front end opening 7 of a steel pipe 5 is closed with a flat bottom plate 6 having an opening 7a at the center, and a lid plate 8 for opening and closing the opening 7a is provided. However, with such a configuration, a part of the defective concrete including the slime may stay under the bottom plate 6.

Therefore, as shown in FIG.
Is formed in an inverted truncated conical shape (funnel shape), and a lid plate 8 for opening and closing the distal end opening 7 is provided. Due to such a configuration, the defective concrete can be obtained as shown in FIG.
As shown by the arrow in (b), since it smoothly moves upward along the inclined surface of the lower part of the steel pipe 5 and goes around the outer periphery of the steel pipe 5, there is almost no danger of stagnation at the bottom.

FIG. 6A shows a state in which a spring 10 is interposed between a steel plate 5 and a cover plate 8 which is openably and closably provided at a distal end opening 7 of a steel pipe 5. A biasing force is applied in the closing direction. 6 to 11 show the steel pipe 5.
The connecting member 9 provided at the lower part is omitted. Then, the tremee pipe 21 is inserted into the steel pipe 5, and the distal end portion thereof is
6B, the lid plate 8 pivots in the direction of the arrow against the urging force of the spring 10 to open the distal end opening 7 as shown in FIG. Can be inserted.

When the tremee tube 21 is pulled up, the cover plate 8 is urged by the spring 10 to rotate in the direction opposite to the arrow, and the tip opening 7 is opened.
Automatically closes. According to this example, the distal end opening 7 can be automatically opened and closed in response to insertion and pulling up of the tremy tube 21 with a simple structure.

FIG. 7 (a) shows a string, a chain, etc., which can be operated on the ground, on a cover plate 8 which can be opened and closed at the end opening 7 of the steel pipe 5.
When the string 11 is loosened, the tip opening 7 is opened, and when the string 11 is pulled, the tip opening 7 is closed as shown in FIG. 7B. . According to this example, the tip opening 7 can be opened and closed by operating from the ground with a very simple structure.

FIG. 8 shows a state in which a semicircular bottom plate 6a is mounted and closed in a region approximately one-half of the distal end opening 7 of the steel pipe 5 to form an opening 7b, and its edge (the center of the distal opening) is formed. Part), a semicircular cover plate 8 partially overlapping with the shaft 12 provided in
a is rotatably mounted, a spring 13 is interposed between the shaft 12 and the cover plate 8a to apply a rotational force to the cover plate 8a as shown in FIG. 7b is closed). Reference numeral 14 denotes a detachable stopper pin provided on the bottom plate 6a, to which a string, a chain, etc. (not shown) which can be operated on the ground is attached.

The steel pipe 5 constructed as described above is connected to the connecting member 9 before (or after) the reinforcing bar 4 in FIG.
As shown in (c), the cover plate 8a is rotated in the direction of the arrow against the spring 13, and the stopper plate 14 is mounted to hold the cover plate 8a at that position. As a result, an opening 7b is formed between the bottom plate 6a and the tip of the steel pipe 5, so that the tremy tube 21 can be inserted through the opening 7b.
When the tremy tube 21 is pulled up, if a string or the like is pulled from the ground to pull out the stopper pin 14, the lid plate 8a
8B, and returns to the state of FIG. 8B to close the opening 7b.

FIG. 9 (a) shows a steel pipe 5 in which a lid plate 8 is attached via a hinge so as to be openable and closable via a hinge. The lid plate 8 is normally suspended by its own weight. Can be easily inserted. When the tremy tube 21 is gradually pulled up and the level of the cast-in-place concrete rises, the cover plate 8 rotates in a direction to close the tip opening 7 by the pressure. When the tremy tube 21 is pulled up and the level of the cast-in-place concrete reaches near the tip of the steel pipe 5, the cover plate 8 closes the tip opening 7 by the pressure of the cast-in-place concrete. According to this example, the tip opening 7 can be opened and closed with a very simple structure.

FIG. 10 (a) shows one end of a bellows-shaped flexible member 16 made of rubber, synthetic resin, etc., which is made of rubber, synthetic resin, etc., is fixed near the front end opening 7 of the steel pipe 5, and the other end is fixed. A telescoping portion 15 is provided by fixing a cylinder 17 having an outer diameter substantially equal to the inner diameter of the tremee tube 21, and a pair of lid plates 8 b rotatably mounted by hinges on the distal end opening 7. .

In such a steel pipe 5, the tip of the tremee pipe 21 inserted into the steel pipe 5 is fitted to the cylinder 17,
For example, the tremee tube 21 is slightly rotated, and the two are integrally connected by a hook or the like (not shown). Then, if the tremie tube 21 is lowered, as shown in FIG.
Since the flexible member 16 is expanded, the tremee tube 2 is in this state.
Pour cast-in-place concrete from 1.

When the cast-in-place concrete is poured in while gradually pulling up the tremy tube 21, the level of the cast-in-place concrete rises, the expansion and contraction portion 15 is taken into the steel pipe 5, and the cover plate 8b is moved by the pressure of the cast-in-place concrete. It turns to close the distal end opening 7 (shown by a broken line in FIG. 10A). Next, the tremy tube 21 is slightly rotated in the opposite direction to release the hooks and the like, and the tremy tube 21 is pulled up. Note that the cover plate 8b may be provided with a spring as described with reference to FIG. 6, or the cover plate 8b may be formed of a single plate.

FIG. 11A shows a state in which a bottom plate 6 having an opening 7a is attached to a tip opening 7 of a funnel-shaped steel pipe 5, and
A cylinder 18 having an outer diameter substantially equal to the inner diameter of the tremy tube 21 protruding into the steel pipe 5 is attached to the opening 7a.
Is provided with an on-off valve 19 on the inner wall of the. In such a steel pipe 5, the tip of the tremee pipe 21 inserted into the steel pipe 5 is fitted to the cylinder 18. And the tremy tube 21
When the cast-in-place concrete is poured into the pit 2, the cast-in-place concrete is filled into the pit 2, but when the level rises, the on-off valve body 19 is closed by pressure. In addition, intrusion of defective concrete into the steel pipe 5 can be prevented.

FIG. 11B shows the cylinder 18 shown in FIG.
A funnel-shaped orifice 19a is provided on the inner wall of the bottom plate to prevent the backflow of cast-in-place concrete, and the opening 7
a is provided with a pair of cover plates 8b as described in FIG. 10, and the cover plate 8b closes the opening 7a by the pressure of the cast-in-place concrete at the same time as the tremy tube 21 is pulled out. This prevents the defective concrete from entering the steel pipe 5. Also in this example, a spring may be interposed between the cover plate 8b and the steel pipe 5, or the cover plate 2b may be formed of a single plate.

Although various embodiments of the steel pipe 5 have been described above, the present invention is not limited to this, and the tremy pipe 21 can be inserted and removed, and defective concrete can be inserted into the steel pipe 5. Other means may be used as long as intrusion can be prevented or suppressed. 6 to 11.
Has shown the case where the tip of the steel pipe 5 is formed in a funnel shape, but as described in the first embodiment, the tip opening 7 of the steel pipe 5 is replaced with a flat bottom plate having an opening in the center. 6
This embodiment can be applied to the steel pipe 5 closed by the above.

[Embodiment 3] FIG. 12 is an explanatory view of a steel pipe according to the present embodiment. In FIG. 12A, 30
Is a precast concrete steel pipe in which a precast concrete 32 is provided on the entire inner wall surface of the steel pipe 31 in the pipe axis direction, for example, by centrifugal molding, and a hollow part 34 vertically penetrating is formed at the center. Reference numeral 33 denotes a plurality of connecting members buried in the lower part of the precast concrete 32 and formed of reinforcing bars for connecting to a reinforcing bar of a cast-in-place concrete pile. This example is of a type that bears the total strength mainly by the steel pipe 31 and the precast concrete 32. Since the cast-in-place concrete pile formed in the lower part is not expected to have strength, even if defective concrete enters the inside, No problem.

FIG. 12B shows a precast concrete steel pipe 30 shown in FIG. 12A in which a bottom plate 35 having an opening 36 in the center is attached to the front end thereof, and the opening 36 can be opened and closed as opening and closing means. Is provided.
In this example, the steel pipe 31, the precast concrete 32, and the cast-in-place concrete pile formed in the lower part bear the full strength mainly, so that the poor concrete of the concrete cast in the cast-in-place concrete pile does not enter into the inside. Is provided with a lid plate 37.

FIG. 12 (c) shows a precast concrete 32a provided on the inner wall from the tip of the steel pipe 31 to the vicinity of the center, where the moment underground is large. In this example, in the vicinity of the joint between the cast-in-place concrete pile and the steel pipe 31 formed in the lower part, the strength of the cast-in-place concrete pile is borne only by the steel pipe 31 and the cast-in-place concrete pile without considering the strength of the cast-in-place concrete pile. Things.

FIG. 12D shows a state in which a bottom plate 36 having an opening 36 in the center is attached to the front end of the precast concrete steel pipe 30 shown in FIG. Is provided. In this embodiment, the steel pipe 31 and the cast-in-place concrete bear the proof stress for all parts, and the cover plate 37 is provided so that the defective concrete does not enter the precast concrete steel pipe 30.

As shown in FIGS. 12B and 12D,
Opening 3 at the end of precast concrete steel pipe 30
In the case where a bottom plate 35 having a base plate 6 is attached and a cover plate 37 for opening and closing the opening 36 is provided, the tip of the steel pipe 31 may be formed in a funnel shape, or the cover as described in the second embodiment. Various opening / closing means for opening the plate may be implemented.

Next, an example of the construction of a cast-in-place steel pipe concrete pile using the precast concrete steel pipe 30 described in FIG. (1) The reinforcing bar 4 and the connecting member 33 of the precast concrete steel pipe 30 are fastened with a wire or the like to integrate them, and this is inserted into the pit 2 as shown in FIG. (2) As shown in FIG. 13 (b), the tremy tube 21 is inserted from the hollow portion 34 of the precast concrete steel tube 30 into the reinforced cage 4 until its tip reaches near the bottom of the pit 2, and The cast-in-place concrete 22 is gradually poured up.

(3) As shown in FIG. 13C, when the cast-in-place concrete 22 is filled into the pit 2 and its level reaches near the lower end of the precast concrete steel pipe 30, the cast-in-place concrete 22 is removed. Stop feeding,
Pull out the tremy tube 21. (4) As shown in FIG. 13 (d), if the casing 20 is removed and the outer periphery of the precast concrete steel pipe 30 is filled with the concrete 24, the cast-in-place steel pipe concrete pile 1 is completed.

Although not shown, when joining the superstructure to the cast-in-place steel pipe concrete pile 1, a pillar is built in the hollow portion 34 via footing.
What is necessary is just to fill the hollow part 34 with the filling concrete and join it integrally. The cast-in-place steel pipe concrete pile 1 constructed as described above bears the entire proof by the steel pipe 31 and the precast concrete 32.

FIGS. 14 and 15 show an example of construction of a cast-in-place steel pipe concrete pile using the precast concrete steel pipe 30 described with reference to FIG. (1) The reinforced cage 4 and the connecting member 33 of the precast concrete steel pipe 30 are fastened with a wire or the like to integrate them, and this is inserted into the pit 2 as shown in FIG. (2) As shown in FIG. 14B, the cover plate 37 provided on the bottom plate 35 of the precast concrete steel pipe 30 is opened,
The tremy tube 21 is inserted from the hollow portion 34 into the reinforced cage 4 until the tip thereof reaches near the bottom of the pit 2, and the cast-in-place concrete 22 is poured into the pit 2 and gradually pulled up.

(3) Cast-in-place concrete 22 in pile 2
Is filled and reaches a level near the bottom plate 6 of the precast concrete steel pipe 30, the casting of the cast-in-place concrete 22 is stopped, and as shown in FIG. The opening 36 of the bottom plate 35 is closed by the cover plate 37. As a result, the cast-in-place concrete 22 becomes a precast concrete steel pipe 30.
Most of the defective concrete, including slime and the like, filled below the steel pipe goes around the outer periphery of the precast concrete steel pipe 30 and does not enter the inside.

(4) Next, as shown in FIG. 15A, the casing 2 is pulled out from the pit 2 and concrete 24 is filled around the outer periphery of the precast concrete steel pipe 30. (5) After the concrete 24 has solidified,
As shown in FIG. 5 (b), when the column member 40 is erected in the precast concrete steel pipe 30 and the filled concrete 23 is filled therein, the joining between the cast-in-place steel pipe concrete pile 1 and the column member 40 is completed.

According to the present embodiment, the steel pipe 31 and the precast concrete 32 are disposed in a portion of the ground where the bending moment is large, and the cast-in-place steel pipe concrete pile 3 bears the proof stress in all the portions.

[0047]

(1) The cast-in-place steel pipe concrete pile according to the present invention is constructed by inserting a steel cage and a steel pipe connected to the steel cage into the pit, filling the pit with concrete, and forming the steel pipe. The opening and closing means that opens and closes the opening at the tip prevents the intrusion of defective concrete into the steel pipe in which the column is built, and eliminates the pile head treatment, reducing labor and reducing work time. And a highly reliable cast-in-place steel pipe concrete pile at low cost can be obtained.

(2) Since the tip of the steel pipe of the above (1) is formed in a funnel shape, the concrete filled downward can be smoothly moved to the outer periphery of the steel pipe along the inclined surface, and the lower part of the steel pipe can be formed. It is possible to prevent poor concrete from staying.

(3) Since the precast concrete is provided on all or a part of the steel pipe of the above (1) or (2) in the pipe axis direction, and the precast concrete is disposed on the portion where the moment in the ground is maximum. In addition, the reliability of the structural performance can be improved.

(4) In the cast-in-place steel pipe concrete pile according to the present invention, a steel pipe and a steel pipe connected to the steel cage are inserted into the pit and concrete is filled into the pit. Since the precast concrete steel pipe in which the precast concrete is provided in all or a part of the pipe axis direction is used, almost the same effect as the above (3) can be obtained.

(5) Since a plurality of connecting members are provided at the tip of the steel pipe or the precast concrete according to any one of the above (1) to (4), which are connected to the reinforcing steel cage by fastening or the like. Can be connected very easily.

(6) In the method for constructing a cast-in-place steel pipe concrete pile according to the present invention, a step of connecting a reinforcing bar and a connecting member provided on a steel pipe at a site by securing them or the like, and integrating the steps. Inserting the reinforced cage and the steel pipe into the pit, inserting the tremy pipe into the reinforced basket from the tip opening of the steel pipe, introducing concrete into the pit while gradually pulling up the tremy pipe, When the level of the concrete filled in reaches the vicinity of the tip of the steel pipe, stop charging the concrete and pull up the tremie pipe, and closing the tip opening by opening and closing means provided at the tip of the steel pipe, A step of filling concrete in the steel pipe and in the outer periphery of the steel pipe, the above (1), (2)
Almost the same effect as (5) can be obtained.

(7) Since a precast concrete steel pipe in which precast concrete is provided on all or a part of the inner wall in the pipe axis direction is used for the steel pipe of (6), the above (3), (4) and (6) ) Can be obtained substantially the same effect.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of Embodiment 1 of the present invention.

FIG. 2 is a perspective view and a longitudinal sectional view of the steel pipe of FIG. 1;

FIG. 3 is an explanatory diagram of an example of a construction method according to the first embodiment.

FIG. 4 is an explanatory diagram of an example of a construction method according to the first embodiment.

FIG. 5 is a vertical sectional view and an operation explanatory view of a steel pipe according to a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional view and an operation explanatory view of another example of the steel pipe according to Embodiment 2 of the present invention.

FIG. 7 is a longitudinal sectional view and an operation explanatory view of another example of the steel pipe according to the second embodiment of the present invention.

FIG. 8 is a longitudinal sectional view and an operation explanatory view of another example of the steel pipe according to the second embodiment of the present invention.

FIG. 9 is a longitudinal sectional view and an operation explanatory view of another example of the steel pipe according to the second embodiment of the present invention.

FIG. 10 is a longitudinal sectional view and an operation explanatory view of another example of the steel pipe according to the second embodiment of the present invention.

FIG. 11 is an explanatory view of another example of the steel pipe according to the second embodiment of the present invention.

FIG. 12 is an explanatory view of a precast concrete steel pipe according to Embodiment 3 of the present invention.

FIG. 13 is an explanatory diagram of an example of a construction method according to the third embodiment.

FIG. 14 is an explanatory diagram of another example of the construction method according to the third embodiment.

FIG. 15 is an explanatory diagram of another example of the construction method according to the third embodiment.

FIG. 16 is an explanatory view of an example of a conventional cast-in-place steel pipe concrete pile.

[Explanation of symbols]

1 cast-in-place concrete pile, 2 pits, 3 cast-in-place concrete pile, 4 steel cage, 5,31 steel pipe, 6,3
5 bottom plate, 7a, 36 opening, 8, 37 lid plate (opening / closing means), 9, 33 connecting member, 21 tremy tube, 22
Cast-in-place concrete, 23 Filled concrete, 24
Concrete, 30 precast concrete steel pipe, 32, 32a precast concrete, 40
Pillar material.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuyoshi Konno, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Kotoshi Takano 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan F-term (reference) in Nippon Kokan Co., Ltd. 2D041 AA03 BA19 BA44 DA03 DA04 DB02 DB05 DB07 EB02

Claims (7)

[Claims] 1. A cast-in-place steel pipe concrete pile in which a steel cage and a steel pipe connected to the steel cage are inserted into a pit, and concrete is filled in the pit to form the steel pipe. Cast-in-place steel pipe concrete piles provided with opening / closing means for opening / closing. 2. The cast-in-place steel pipe concrete pile according to claim 1, wherein the tip of the steel pipe is formed in a funnel shape. 3. The cast-in-place steel pipe concrete pile according to claim 1, wherein precast concrete is provided on all or a part of the inner wall of the steel pipe in the pipe axis direction. 4. A cast-in-place steel pipe concrete pile formed by inserting a steel cage and a steel pipe connected to the steel cage into the pit and filling the pit with concrete, wherein the steel pipe has A cast-in-place steel pipe concrete pile using a precast concrete steel pipe in which all or part of precast concrete is provided. 5. The cast-in-place steel pipe concrete according to claim 1, wherein a plurality of connecting members are provided at a tip end of the steel pipe or precast concrete to be connected to a reinforcing steel cage by securing or the like. Pile. 6. A method for constructing a cast-in-place steel pipe concrete pile in which a reinforced cage and a steel pipe connected to the reinforced cage are inserted into a pit, and concrete is filled in the pit to form the pile. Connecting the connecting member provided in the above by tying or the like, integrating the integrated steel cage and the steel pipe into the pit, and tremie into the steel cage from the tip opening of the steel pipe. A step of inserting a pipe, a step of pouring concrete into the pit while gradually pulling up the tremy pipe, and stopping the input of concrete when the level of concrete filled in the pit reaches near the tip of the steel pipe. Pulling up the tremy tube and closing the tip opening by opening and closing means provided at the tip of the steel pipe, and filling concrete in the steel pipe and the outer periphery of the steel pipe. A method for constructing a cast-in-place steel pipe concrete pile, comprising: 7. The method for constructing a cast-in-place steel pipe concrete pile according to claim 6, wherein the steel pipe is a precast concrete steel pipe in which precast concrete is provided on all or a part of an inner wall in a pipe axis direction.