JPH01295957A - Concrete filling pipe construction and execution thereof - Google Patents

Abstract

PURPOSE:To make concrete filling compact and high-quality by setting back both ends of a lining concrete and forming a slope at least on one end in a concrete pipe. CONSTITUTION:A lining concrete 2 is formed in the internal circumferential surface of a steel pipe 1 by centrifugal force, and both ends thereof are set back. In addition, one end of the lining concrete 2 set back at least forms such a slope 6 that gradually enlarge a diameter with the approach to the end of the pipe. Such a concrete pipe (A) is connected, and after placing it on a specific location, when concrete is filled into the pipe, an impregnation work for a space made between end plates can't be necessary, and a placed concrete is filled while rising along the slope smoothly, so that a compact and high-quality concrete execution can be carried out.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention is a precast concrete pipe manufactured by centrifugally forming concrete on the inner surface of the pipe, etc., which can be assembled into columns, columns, etc. on site. The present invention also relates to a concrete-filled pipe structure constructed by filling the inside with concrete and its construction method.

“Conventional technology” As a conventional concrete-filled pipe structure of this type, No. 6
BACKGROUND ART There is a known anti-strength structure constructed by filling the inside of a precast concrete pipe with concrete, as shown in FIGS. 1 and 7.

Reference numeral A in the figure is a precast concrete pipe used as a pile, and the inner peripheral surface of the steel pipe 1 is lined with concrete 2 of uniform thickness by centrifugal force forming.

Disc-shaped end plates 3.3 are provided on both end faces of the steel pipe etc. 1 so that the outer surface side is connected to other steel pipes etc. and the inner surface side thereof is in contact with the lining concrete 2.

The Brecast I and concrete pipe A configured as described above are successively driven into the ground by a press-in method etc. at the site, and the end plate 3 of the precast concrete pipe to which the end plate 3 is to be connected is connected to the end plate 3 of the precast concrete pipe. They are connected by a connecting means such as welding in an overlapping state. Furthermore, after the precast concrete pipes A, A, etc. are connected to a predetermined length underground and installed, as shown in Fig. 4, cast-in-place concrete 4 is placed inside the precast concrete pipes. By being cast, it becomes a concrete-filled pipe pile structure, etc.

"Problems to be Solved by the Invention" However, in the conventional concrete-filled pipe structure, since end plates are formed at the ends of the precast concrete pipe, the end plates are overlapped to form the precast concrete pipe. When welding and connecting the pipes in the longitudinal direction, gaps occur at the contact surfaces between the ends due to manufacturing and construction errors, and structurally, the precast concrete pipe is expected to bear stress in the longitudinal direction. However, there were problems with reliability. For this reason, it was necessary to inject fine particles of high-strength cement paste or the like into the gaps to prevent them from forming, which left problems with workability.

In addition, when connecting precast concrete pipes in the longitudinal direction, if dimensions need to be adjusted, end plates must be cut or concrete must be poured, making the work complicated. There was a risk that this would cause a delay in the construction period.

The present invention has been made in view of the above-mentioned problems, and when connecting steel pipes etc. (precast concrete pipes) whose interiors are lined with concrete (precast concrete pipes) in the longitudinal direction, the gap between the end plates of the joint flat part of the precast concrete pipes is The object of the present invention is to provide a concrete-filled pipe structure that does not require pouring and can easily adjust dimensions in the longitudinal direction, and a method for constructing the same.

"Means for Solving the Problems" This invention provides that both ends of lining concrete formed by centrifugal force on the inner peripheral surface of a pipe etc. are set back,
And by forming a structure in which at least one end of the setback lining concrete is formed with an inclined surface whose diameter gradually increases as it approaches the end of the pipe, etc.
The above objectives have been achieved.

Furthermore, the method of the present invention includes forming a lining concrete with both ends set back by centrifugal force on the inner circumferential surface of a pipe, etc. to form a precast concrete pipe, and then connecting the precast concrete pipe to a predetermined length to form a precast concrete pipe. After being installed at a location, the inside of the precast concrete pipe is filled with concrete.

"Function" In the present invention, since the concrete at both ends of the precast concrete pipe is set back, there is no need for pouring work into the gap created between the end plates when connecting the precast concrete pipes. do. Furthermore, when adjusting the dimensions, it is sufficient to cut only the ends of the steel pipe, etc., and the dimensions can be easily adjusted.

Furthermore, since a sloped surface is formed on at least one end of the setback lining concrete, it is recommended that the precast concrete pipe be built with the sloped surface facing downward and concrete poured inside. For example, since the poured concrete is filled while smoothly rising up the slope, air pockets are not formed in the setback part of the lining concrete, and even if the lining concrete shrinks and sinks after pouring, , there is also a 1, - near the connection part.
As the concrete above sinks and fills due to its own weight, dense, high-quality concrete construction is possible.

"Example" The present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of the concrete-filled pipe structure of the present invention. In addition, in this embodiment, the same reference numerals are given to the same elements as those shown in the conventional technique.

Figure 2 shows that the concrete-filled pipe structure of this example is used for building B.
This figure shows the state in which it is being used as a column and pile. Inside Building B, the beam 5 is connected to function as a concrete-filled pipe column structure, and the bottom plate Bl of Building B is functioning as a column structure. The lower part functions as a concrete-filled pipe pile structure.

FIG. 1 is an enlarged sectional view of two parts in FIG.
In the concrete-filled pipe column structure and concrete-filled pipe pile structure, lining concrete is formed by centrifugal force forming on the inner peripheral surface of a steel pipe, etc., and further inside the lining concrete 2 is concrete 4 cast on site.
Furthermore, both ends of the lining concrete 2 are slightly set back from the ends of the steel pipes, etc., and both ends of the set back lining concrete are provided with the ends of the steel pipes, etc. An inclined surface 6 is formed whose diameter gradually increases as it approaches. Note that a bearing plate may be provided inside the steel pipe, etc., at the connection portion with the beam 5, etc., for pressing the lining concrete in the axial direction of the steel pipe, etc.

Next, the construction method of the concrete-filled pipe structure of this embodiment having the above configuration will be explained and explained along with its operation.

* First, as shown in Figure 3, a steel pipe etc. 1 is set in a centrifuge (not shown), and with concrete 2 placed inside the steel pipe etc., the centrifuge is operated to remove the steel pipe 1. By rotating, the inside of the steel pipe etc. 1 is lined with concrete 2 to produce a precast concrete pipe A.

At that time, an upper end formwork 7 and an upper end formwork 8 are installed near both ends of the steel pipe etc. 1, and the concrete 5 to be lined is the steel pipe etc.! Setback should be made near both ends of. Furthermore, the upper end formwork 7 and the upper end formwork 8
is formed with a smooth inclined surface 6 whose diameter gradually increases as it approaches the end of the steel pipe or the like. This slope is S
It is more desirable to form it into a curved shape.

*Next, as shown in Fig. 4, the precast concrete pipe A with the lining concrete 2 formed therein by centrifugal force is connected to a predetermined length, or after the connection, the precast concrete pipe A is inserted into a predetermined place by a press-fitting method, etc. Install.

When installing the precast concrete pipe A, if the lining concrete has an inclined surface 6 formed at only one end, the precast concrete pipe A is always erected with the side where the inclined surface 6 is formed as the lower end.

* When the precast concrete pipe A is installed to a predetermined depth, the inside thereof is filled with concrete using the tremie pipe 9 to construct a concrete-filled pipe pile structure.

At this time, the poured concrete 4 rises smoothly along the slope 6 even at the set pack position of the lining concrete 2, and also smoothly shrinks and sinks after being poured, so that the end of the lining concrete 2 There are no air pockets or aggregate separation in the vicinity (near the joint).

*After the concrete-filled pipe pile structure is constructed, the precast concrete pipes A are successively connected to the upper part of the pile structure, and the precast concrete pipes A are connected to the joint part. A concrete-filled pipe column structure is constructed by pouring concrete into , A, .

In this way, in the concrete-filled pipe structure of this embodiment, since the concrete 2 at both ends of the steel pipe etc. l of the precast concrete pipe A is set back, when adding and connecting the precast concrete pipe A, Also, it is possible to eliminate the need for injection work into the gap created between the end plates. Also, when adjusting dimensions in the height direction, it is only necessary to cut and adjust the ends of the steel pipes, etc. of precast concrete pipe A, making it possible to easily and accurately adjust dimensions in the longitudinal direction. It is possible to shorten the construction period and perform high quality and reliable construction.

Furthermore, since the sloped surface 6 is formed at the end of the saw lining concrete 2 that has been set back, the poured concrete 4 is filled while rising smoothly along the sloped surface 6. After installation, the lining concrete 2 shrinks and settles smoothly, so that no air pockets or aggregate separation are formed in the setback crotch part (near the connection part) of the lining concrete 2, allowing dense, high-quality concrete construction.

Incidentally, in the embodiments described above, if a steel pipe or the like which has been subjected to an unbonding treatment on the inside thereof is used, it can be implemented as an unbonded concrete-filled pipe structure.

"Effects of the Invention - As explained above, the concrete-filled pipe structure and its construction method of the present invention have concrete at both ends of the steel pipe, etc. of the precast concrete pipe being set bard, so that it is difficult to connect the precast concrete pipes. In this case, it is possible to eliminate the need for injection work into the gap that occurs between the end plates, which solves the problem of conventional structures and construction methods that require complicated construction. , when adjusting the dimensions at the connection part, it is only necessary to cut the steel pipe, etc., and the dimensions can be easily and accurately adjusted.Therefore, high quality with extremely high structural reliability. This will provide a concrete-filled pipe structure and its construction method, making an extremely large contribution to the development of the construction industry.

In addition, since a sloped surface is formed at least at one end of the setback lining concrete, it is recommended to build a precast concrete pipe with the sloped surface facing downward and pour concrete inside. Ba,
Because the poured concrete is filled while smoothly rising up the slope, and because the concrete shrinks and sinks smoothly after being poured, air pockets are not formed in the setback part of the lining concrete.
This has the effect of making it possible to construct dense, high-quality concrete without reducing aggregate separation.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the present invention, and FIG. 1 is an enlarged view of two parts of FIG.
A side sectional view of the concrete-filled pipe structure of the present invention, Fig. 2 is an explanatory diagram for explaining the state in which the concrete-filled pipe structure of the present invention is used as a pillar or pile of a building, and Fig. 3 is centrifugal force forming. Fig. 4 is a side sectional view of the precast concrete pipe column installed in the ground, and Fig. 5 is a side sectional view of the precast concrete pipe column installed in the ground. FIG. 6 is a side sectional view showing the location where the Fig. 7 shows the conventional technology, Fig. 6 is a side sectional view of precast concrete pipes before connection, and Fig. 7 shows the conventional technology by connecting precast concrete pipes and pouring concrete inside. FIG. 2 is a side sectional view of the constructed concrete-filled pipe structure. A... Precast concrete pipe, l...
... Steel pipes, etc., 2 ... Lining concrete (concrete), 4 ... Pouring concrete (
concrete), 6... Slope surface.

Claims (1)

[Claims] 1. A concrete-filled pipe structure used for columns, piles, etc., in which both ends of the lining concrete formed by centrifugal force on the inner peripheral surface of the pipe, etc. are set back, and the set A concrete-filled pipe structure characterized in that at least one end of the backed lining concrete is formed with an inclined surface whose diameter gradually increases as it approaches the end face of the pipe or the like. 2. Form a lining concrete on the inner peripheral surface of the pipe etc. with both ends set back by centrifugal force to form a precast concrete pipe, then connect the precast concrete pipe to a predetermined length and install it at a predetermined location, A method for constructing a concrete-filled pipe structure, comprising filling the inside of the precast concrete pipe with concrete.