JPH0579764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for constructing a head joint in a row of steel pipe pile columns used for earth retaining walls, seawalls, etc.

(Prior art) At the upper end of a row of steel pipe pile columns used for earth retaining walls, bank protection, etc., a head connection part is constructed that continues in the direction of the row of steel pipe columns. A concrete formwork for constructing the head joint is assembled on site, reinforcement is arranged and concrete is placed within the form, and after the concrete has cured, the formwork is dismantled and removed to construct the head joint.

(Problems to be Solved by the Invention) The conventional head joint construction method as described above has the drawback that it requires a great deal of effort and time to assemble and dismantle the concrete formwork on site.

(Means for Solving the Problems) In order to solve the above-mentioned conventional problems, the present invention has a structure in which the steel pipes are installed on the lower side of the hollow frame for constructing the head connection part that rides on the constructed steel pipe pile column row. A plurality of positioning fitting members that fit inside each of the upper ends of the steel pipe piles in the pile column row are movably mounted in the length direction of the column column, and each positioning fitting member is attached to the upper end of the steel pipe pile column. Each positioning fitting member is fixed to the frame while being fitted inside the upper ends of a plurality of steel pipe piles, and concrete is poured into the frame, or the frame is left hollow and connected to the head joint. This paper proposes a method for constructing steel pipe pile column head connections that is characterized by:

(Example) An example of the present invention will be described below based on the attached illustrative drawings.

In FIGS. 1 and 2, 1 is a row of steel pipe pile columns for revetment, and 2 is a head connection part constructed at the upper end of the steel pipe pile column 1 according to the construction method of the present invention.

As shown in FIG. 3, the steel pipe pile column row 1 includes:
Steel pipe piles 3 that do not have connecting members protruding along the axial direction on their outer peripheral surfaces are press-fitted at appropriate intervals while rotating, and are placed between adjacent steel pipe piles 3 on both sides of the closest position between both steel pipe piles 3. A pair of side plates 4, 5 having both side edges 4a, 5a close to the outer peripheral surfaces of both steel pipe piles 3.
are constructed by press-fitting a junction 7 integrally connected by a connecting member 6 passing between both steel pipe piles 3 to a required depth.

The steel pipe pile 3 is installed at a required depth D from the river bed 15 as shown in FIG. 1 to obtain the necessary vertical support strength.
1, but when the total length becomes long, multiple unit-length steel pipe piles are sequentially connected by on-site welding or other methods and then rotated and press-fitted.

The juncture 7 is vertically press-fitted between the two steel pipe piles 3 that have already been rotationally press-fitted, using both steel pipe piles 3 as guides, but its main purpose is to obtain a water-stopping effect between the steel pipe piles 3. In some cases, the depth D from the riverbed 15 at which the water stoppage effect can be obtained
2 is press-fitted. Of course, the juncture 7
The upper end is located at approximately the same level as the upper end of the steel pipe pile 3.

The cross-sectional shape of the junction 7 is not limited to that shown in FIG. Moreover, the steel pipe pile column row 1 composed of the steel pipe pile 3 and the junction 7 in this way
is shown as an example, but the cross section is C-shaped or T-shaped on both sides in the diametrical direction.
A steel pipe constructed by press-fitting only conventional general steel pipe sheet piles, in which shaped connecting members are fixedly protruded over the entire length of the steel pipe pile, into a row of columns so that adjacent connecting members fit into each other. It may be a row of piles and pillars.

The head connecting portion 2 is constructed at the upper end of the steel pipe pile column row 1 configured as described above.
As shown in FIGS. 4 to 6, on the underside of the hollow frame 16 for constructing the head connection section that rests on the steel pipe pile column row 1,
A plurality of (in the illustrated example, three) positioning fitting members 17 that are individually fitted into the upper ends of the steel pipe piles 3 in the steel pipe pile column row 1 are attached movably in the length direction of the column column. It is constructed as follows.

That is, the hollow frame 16 for constructing the head connection part is
Both side plates 1 are attached to the frame 18 made of angle material etc.
It is a rectangular box-shaped box with only 9 stretched and both upper and lower sides and both lengthwise ends open, and groove-shaped guide rails 20a, 20b extending inward on both sides of the bottom.
are provided, and the grooved guide rails 20a, 20
The upper plate b serves as cover plates 21a and 21b that cover both left and right sides of the upper end of the steel pipe pile column row 1. Further, each of the positioning fitting members 17 has a tapered fitting guide 23 protruding from the outside of the bottom of the bottomed cylindrical body 22 that fits into the steel pipe pile 3, and the hollow frame 16 for constructing the head connecting portion. two sliding bodies 24a, which fit into the groove-shaped guide rails 20a, 20b;
24b to the upper end of the bottomed cylindrical body 22, the connecting plate 25a,
25b, and the hollow frame 16 for constructing the head joint and the fitting member 17 for positioning are manufactured in advance at a factory and transported to the site.

Thus, the hollow frame 16 in which each positioning fitting member 17 is set is inserted into the steel pipe pile column row 1 with each fitting member 17 positioned directly above each steel pipe pile 3.
The steel pipe pile 3 is suspended upward, and each fitting member 17 is fitted into the upper end of the steel pipe pile 3. At this time, even if there are variations in the spacing between the steel pipe piles 3, each fitting member 17 is movable relative to the hollow frame 16 in the length direction (column row direction) of the guide rails 20a, 20b. Coupled with the guiding action of the fitting guide 23, it is possible to fit each steel pipe pile 3 reliably and smoothly.

When the hollow frame 16 is placed on the upper end of the steel pipe pile column row 1 in this way, the left and right pair of connecting plates 25a, 25b of each fitting member 17 are placed on the cover plates 21a, 21 on the hollow frame 16 side that overlap with the pair of left and right connecting plates 25a, 25b.
b by bolts and nuts 26 to fix each fitting member 17 to the hollow frame 16. However,
If it is not possible to stabilize the hollow frame 16 in a horizontal state due to variations in the level of the upper end of each steel pipe pile 3 or the upper end of the juncture 7, the sixth
As shown in the figure, the four corners of the hollow frame 16,
For example, the hollow frame 16 can be stably supported in a horizontal state by screwing in and unscrewing the level adjustment bolts 27 screwed through both ends of the cover plates 21a and 21b. At this time, the hollow frame 1 is
A mortar filled portion 28 filled with soil and hardened inside the juncture 7 can be used as a surface supporting the juncture 7, but a plate is attached to the upper end of the juncture 7, and the level adjustment is performed using the plate. The tip of the bolt 27 may be received.

Furthermore, if necessary, in order to fix the hollow frame 16 and the steel pipe pile column row 1, each steel pipe pile 3 and each fitting member 17 fitted therein can be fixed to each other by, for example, an adhesive.

As described above, the hollow frames 16 are sequentially set on top of the steel pipe pile column row 1 so as to be continuous in the direction of the column row, and the ends of the adjacent hollow frames 16 are connected to each other at both ends of the hollow frames 16. They are connected by bolts and nuts using the plate 18a. Then, cover plates are attached to the free ends of the hollow frame 16 located at both ends of the head connecting part 2 to close them off. Thereafter, concrete is placed inside each hollow frame 16 and inside the bottomed cylindrical body 22 of each fitting member 17 to construct the head connecting portion 2. In this case, if necessary, it is possible to arrange reinforcement inside the hollow frame 16 to make it made of reinforced concrete, but this reinforcement work should be done when the hollow frame 16 is manufactured at the factory, and the arrangement at the construction site. Muscle work can also be eliminated. Of course, if the size of the head joint 2 is small, pouring concrete into the hollow frame 16 is omitted, and the upper opening of the hollow frame 16 is closed with a cover plate, leaving the head joint 2 hollow. Also good.

Moreover, as shown in FIGS. 1, 2, and 5,
If it is necessary to install a decorative panel 29 made of a steel plate or a concrete plate on the outside of the upper end of the steel pipe pile column row 1 exposed above the water surface, the upper end of the decorative panel 29 should be attached to both the left and right sides of the hollow frame 16. It can be attached to a decorative panel attaching portion 30 formed at the lower end using bolts 31 or the like. Furthermore, as shown in FIGS. 5 and 6, for example, a decorative panel 32 covering the outside can be pasted on the hollow frame 16 itself, or as shown in FIGS. When using the connecting portion 2 as a promenade, handrails 33 and other exterior features such as fences and flower beds can also be installed.

(Operations and Effects of the Invention) The construction method of the present invention can be implemented as described above, and according to the construction method of the present invention, a hollow frame for constructing a head connection portion is placed on the constructed steel pipe pile column row. After each lower positioning fitting member is transferred so that it fits inside the upper end of the steel pipe pile, each of the fitting members and the hollow frame are fixed, and if necessary, concrete is poured into the hollow frame. This eliminates the need to assemble concrete formwork for constructing head connections on steel pipe pile column rows and to dismantle and remove formwork after concrete curing, reducing man-hours for manufacturing head connections on site. It can be significantly reduced.

Moreover, the hollow frame can be firmly connected to the steel pipe pile column row by the plurality of positioning fitting members, but since the positioning fitting members are movable in the direction of the column column, the steel pipe The hollow frame can be reliably connected to the steel pipe pile column without being affected by variations in the spacing between the steel pipe piles in the pile column.

[Brief explanation of the drawing]

Figure 1 is a side view, Figure 2 is a longitudinal front view, Figure 3 is a cross-sectional plan view, Figure 4 is a side view explaining the construction method of the head joint, and Figure 5 is details of the constructed head joint. FIG. 6 is a longitudinal sectional front view for explaining the same, and FIG. 6 is a sectional plan view thereof. 1...Steel pipe pile column row for seawall, 2...Head connection, 3...
... Steel pipe pile, 7 ... Junction, 16 ... Hollow frame for constructing the head joint, 17 ... Fitting member for positioning, 20a, 20b ... Channel guide rail, 2
1a, 21b...cover plate, 22...bottomed cylindrical body, 23...tapered fitting guide, 24a,
24b...Sliding body, 29, 32... Decorative panel.

Claims (1)

[Claims] 1. A plurality of positioning fitting members that are individually fitted into the upper ends of the steel pipe piles in the steel pipe pile column row are attached to the lower side of the hollow frame for constructing the head connection part that rests on the constructed steel pipe pile column row. Each positioning fitting member is attached movably in the row length direction, and each positioning fitting member is fixed to the frame with each positioning fitting member being fitted into the upper ends of the plurality of steel pipe piles of the steel pipe pile column row. A construction method for a steel pipe pile column head connection, characterized in that concrete is poured into the frame or the frame is left hollow to serve as the head connection.