JP7649764B2 - Connection structure and connection method - Google Patents

Description

The present invention relates to a connection structure between a batter pile and a precast superstructure.

Piers used for mooring ships, etc., are constructed with the superstructure supported by piles. By using batter piles as these piles, horizontal forces can be effectively resisted, and reinforcement of the piles with braces, etc. can be omitted.

The superstructure can be constructed by pouring concrete on-site, but as it is strongly affected by meteorological and hydrographic conditions such as tides and waves, there is a risk of delays in the process and impacts on quality and the environment. Furthermore, when renovating a pier at a private facility that is currently in operation, the construction period is long, which may disrupt operational activities. For this reason, a precast concrete superstructure is sometimes used, as in Patent Document 1, in order to shorten the construction period, improve quality, and ensure safety.

JP 2019-152089 A

When constructing a pier using a precast superstructure, the precast superstructure is lowered over the piles that have been cast in advance, and the precast superstructure is connected to the piles, but the problem here is the connection between the inclined piles and the precast superstructure. Normally, holes are made in the precast superstructure that are the diameter of the pile plus a construction error in order to insert the piles, but in the case of inclined piles, the holes for inserting the piles must be made larger because the piles are at an angle, and because the holes are larger, post-construction work such as reinforcement takes time.

Meanwhile, in Patent Document 1, a bent connecting member is used to connect the batter pile to the precast superstructure, and the inclined part of the connecting member is inserted into the head of the batter pile and fixed, and then the vertical part of the connecting member is inserted into a hole in the precast superstructure, and the hole is filled with a filler material. This allows the diameter of the hole in the precast superstructure to be small, even at the connection between the batter pile and the precast superstructure.

However, in Patent Document 1, the diameter of the hole in the precast superstructure is larger by the thickness of the filler material between the vertical part of the connecting member and the hole wall of the precast superstructure, and it can be said that there is still room to reduce the diameter of the hole. In addition, stress is transmitted between the vertical part of the connecting member and the precast superstructure via the filler material, and in order to more reliably connect the inclined pile and the precast superstructure, a structure is also required that can transmit the stress generated at the pile head directly to the precast superstructure.

The present invention was made in consideration of the above problems, and aims to provide a connection structure etc. that can shorten the process while ensuring the quality of the pile head connection by reducing the diameter of the holes in the precast superstructure.

The first invention for solving the above-mentioned problems is a connection structure between a batter pile and a precast concrete superstructure, in which the upper part of a protruding pipe is embedded in the precast superstructure so as to be in contact with the concrete of the precast superstructure, the lower part of the protruding pipe protrudes below the precast superstructure, the lower end of the protruding pipe is inserted into the vertical part of a bent connecting pipe, the upper end of the batter pile is inserted into the inclined part of the connecting pipe, and a filler material is filled between the connecting pipe and the protruding pipe and the batter pile.

The connection structure of the present invention connects the lower end of the protruding pipe buried directly in the precast superstructure to the upper end of the inclined pile, eliminating the need for the filler material described in Patent Document 1. This allows the diameter of the hole (protruding pipe) in the precast superstructure to be smaller, shortening the process while ensuring the quality of the pile head connection. In addition, stress is transmitted directly from the protruding pipe to the precast superstructure without going through a filler material, so the connection between the inclined pile and the precast superstructure can be ensured.

In addition, the lower end of the protruding pipe is inserted into the vertical part of the bent joint pipe, the upper end of the inclined pile is inserted into the inclined part of the joint pipe, and a filler material is filled between the joint pipe, the protruding pipe, and the inclined pile, so that the inclined pile and the protruding pipe can be securely joined by the joint pipe and the filler material, and since welding work is not required, construction work is also less labor-intensive.

It is preferable that the batter pile has a horizontal plate at its upper end, and the lower end of the protruding pipe is placed on the horizontal plate.
This allows the protruding pipe to be stably positioned at the upper end of the batter pile during construction.

It is preferable that a hole for filling the filler material be provided on a side surface of the lower portion of the protruding tube.
This allows the filling material to be filled from the inside of the protruding tube, making the filling work of the filling material easier.

The connection structure is, for example, a connection structure between a batter pile and a precast superstructure in a pier at a port.
This makes it easier to construct the pier and shortens the construction period.

The second invention is a method for connecting a batter pile to a concrete precast superstructure using the connection structure of the first invention, characterized by having the steps of: inserting the upper end of the batter pile into the inclined part of the connecting pipe and installing the connecting pipe at the upper end of the batter pile; lowering the precast superstructure with the upper part of the protruding pipe buried therein from above the batter pile, and inserting the lower end of the protruding pipe protruding below the precast superstructure into the vertical part of the connecting pipe; and filling the space between the connecting pipe and the protruding pipe and the batter pile with a filler material.

The present invention makes it possible to provide a connection structure that can shorten the construction process while ensuring the quality of the pile head connection by reducing the diameter of the holes in the precast superstructure.

FIG. A diagram showing the top surface of the precast superstructure 2. A diagram showing a connection structure 10. FIG. 4 is a diagram showing the arrangement of a plate 111. A diagram showing the connection method between the inclined pile 4 and the precast superstructure 2. A diagram showing the hole 112 and the recess 24. 1A and 1B are diagrams illustrating a connection structure 10a. 4A and 4B are diagrams illustrating a connection structure 10b.

The following describes in detail a preferred embodiment of the present invention with reference to the drawings.

(1. Pier 1)
Fig. 1 is a diagram showing a pier 1 having a connection structure 10 according to an embodiment of the present invention, and shows a vertical cross section taken along line a-a in Fig. 2 which will be described later. The pier 1 is a pier installed on the coast of a harbor or the like, and is used for mooring ships, etc.

The pier 1 is constructed with a precast superstructure 2 supported by vertical piles 3 and inclined piles 4 driven into the ground at the bottom of the water. The precast superstructure 2 is a plate-shaped member made of concrete. Steel pipe piles are used for the vertical piles 3 and inclined piles 4. Note that the pier 1 is not limited to having vertical piles 3 and inclined piles 4, and may have only inclined piles 4.

Figure 2 is a top view of the precast superstructure 2. The precast superstructure (hereafter simply referred to as the superstructure) 2 has a rectangular plan view. The superstructure 2 is composed of a deck and beams 21, 22, and on the underside of the deck, beams 21 in the long side direction and beams 22 in the short side direction are provided in a lattice pattern. The long side direction and short side direction of the superstructure 2 correspond to the up-down direction and left-right direction in Figure 2, respectively.

The vertical piles 3 and the inclined piles 4 are connected to the superstructure 2 at the intersection of the beams 21 and 22.

At this intersection, the upper part of the protruding pipe 11 is embedded in the superstructure 2 as part of the connection structure 10 of the inclined piles 4. Some of the inclined piles 4 extend from the center of the short side of the superstructure 2 toward one end of the short side, and others extend toward the other end. A pair of protruding pipes 11 is provided corresponding to each of these pairs of inclined piles 4.

(2. Connection structure 10)
Fig. 3 is a diagram showing the connection structure 10, and shows a vertical cross section taken along line bb in Fig. 2. As shown in Fig. 3, the connection structure 10 has a protruding pipe 11, a joining pipe 12, a filler 13, and the like.

The protruding pipes 11 are arranged so as to penetrate the superstructure 2 in the thickness direction. The upper parts of the protruding pipes 11 are embedded in the superstructure 2 so as to be in direct contact with the concrete of the superstructure 2, and the lower parts of the protruding pipes 11 protrude below the superstructure 2. Steel pipes are used for the protruding pipes 11, and two flange-shaped plates 111 are provided around the upper parts of the protruding pipes 11 in upper and lower tiers. These plates 111 are embedded in the concrete of the superstructure 2.

Figure 4 shows the arrangement of the plates 111 in the superstructure 2 from above. The plates 111 are provided in common to the pair of protruding pipes 11 described above. The main reinforcement bars 23 in the long and short side directions of the superstructure 2 are fixed to the plates 111 by welding or the like. The main reinforcement bars 23 can also be fixed directly to the outer surface of the protruding pipe 11.

As shown in FIG. 3, the lower end of the protruding pipe 11 abuts against the upper end of the inclined pile 4. The upper end of the inclined pile 4 is horizontal, and a horizontal plate 41 is placed on top of it, with the lower end of the protruding pipe 11 resting on the horizontal plate 41. The horizontal plate 41 also has a pouring hole (not shown) for pouring concrete into the inclined pile 4.

The connecting pipe 12 is provided around the joint between the lower end of the protruding pipe 11 and the upper end of the inclined pile 4. The connecting pipe 12 has a bent shape, and the lower end of the protruding pipe 11 is inserted into its vertical part, and the upper end of the inclined pile 4 is inserted into its inclined part.

The filler 13 is filled between the connecting pipe 12 and the protruding pipe 11 and the inclined pile 4. A cement-based solidification material such as concrete can be used as the filler 13. The protruding pipe 11 and the inclined pile 4 are joined by the connecting pipe 12 and the filler 13.

Figure 3 shows one of the inclined piles 4 extending toward both ends of the superstructure 2 in the short side direction, but the other inclined pile 4 is also connected to the superstructure 2 in a similar configuration to that shown in Figure 3.

(3. Method of connecting the inclined pile 4 and the superstructure 2)
Fig. 5 is a diagram for explaining a method of connecting the batter pile 4 and the superstructure 2. In this embodiment, first, a connecting pipe 12 is installed as shown in Fig. 5(b) on the upper end of the batter pile 4 that has been driven in advance as shown in Fig. 5(a). The connecting pipe 12 is arranged so that the upper end of the batter pile 4 is inserted into its inclined portion, and is fixed to the upper end of the batter pile 4 by a temporary support material (not shown) or the like that is provided in advance on the connecting pipe 12. In addition, the above-mentioned horizontal plate 41 is fixed in advance to the upper end of the batter pile 4 by welding or the like.

Then, as shown by the arrow in Figure 5 (c), the superstructure 2 with the protruding pipe 11 already installed is hung from above the inclined pile 4 and lowered, and the lower end of the protruding pipe 11 is inserted into the vertical part of the connecting pipe 12 and placed on the horizontal plate 41.

Then, as shown in FIG. 5(d), the connection structure 10 is formed by filling the gap between the connecting pipe 12, the protruding pipe 11, and the batter pile 4 with the filler 13. For example, the filler 13 can be filled from the gap between the upper end of the connecting pipe 12 and the lower surface of the superstructure 2 after providing a bottom formwork (not shown) that closes the gap between the lower end of the connecting pipe 12 and the batter pile 4. At this time, concrete (not shown) is also filled into the batter pile 4 through the casting holes in the horizontal plate 41.

As described above, the connection structure 10 of this embodiment connects the lower end of the protruding pipe 11 buried directly in the superstructure 2 to the upper end of the inclined pile 4, eliminating the need for the filler material of Patent Document 1 mentioned above. This allows the diameter of the hole (protruding pipe 11) in the superstructure 2 to be smaller, which leads to shortening the process while ensuring the quality of the pile head connection. In addition, stress is transmitted directly from the protruding pipe 11 to the superstructure 2 without going through a filler material, so the connection between the superstructure 2 and the inclined pile 4 can be ensured.

The lower end of the protruding pipe 11 is inserted into the vertical part of the bent joint pipe 12, the upper end of the inclined pile 4 is inserted into the inclined part of the joint pipe 12, and the filler material 13 is filled between the joint pipe 12 and the protruding pipe 11 and the inclined pile 4. This ensures that the joint pipe 12 and the filler material 13 can reliably join the inclined pile 4 and the protruding pipe 11, and eliminates the need for welding work, making construction less labor-intensive.

The inclined pile 4 also has a horizontal plate 41 at its upper end, so the lower end of the protruding pipe 11 can be stably placed on the horizontal plate 41 during construction.

However, the present invention is not limited to the above embodiment. For example, in this embodiment, the filler 13 is filled from the gap between the upper end of the connecting pipe 12 and the lower surface of the superstructure 2, but if a hole 112 is provided on the side of the lower part of the protruding pipe 11 as shown in FIG. 6(a), the filler 13 can also be filled from inside the protruding pipe 11, making the filling work of the filler 13 easier. Also, in the gap between the upper end of the connecting pipe 12 and the lower surface of the superstructure 2, a corrosion-resistant coating may be provided on the outer surface of the protruding pipe 11.

In this embodiment, a gap is provided between the upper end of the connecting pipe 12 and the underside of the superstructure 2, but as shown in FIG. 6(b), a recess 24 may be provided on the underside of the superstructure 2, and the upper end of the connecting pipe 12 may be inserted into the recess 24 and concrete 25 may be provided in the recess 24, thereby fixing the upper end of the connecting pipe 12 to the superstructure 2.

In this embodiment, concrete pouring holes are provided in the horizontal plate 41, but it is also possible to omit the pouring holes in the horizontal plate 41 by filling the inclined pile 4 with concrete before fixing the horizontal plate 41 to the inclined pile 4 (see Figure 5 (b)).

In this embodiment, a bottom formwork is provided between the lower end of the connecting pipe 12 and the inclined pile 4 when filling the filling material 13, but in the process shown in Figure 5 (b), a bottom formwork that has already been provided at the lower end of the connecting pipe 12 may be installed at the upper end of the inclined pile 4.

Figure 7 is a diagram illustrating connection structure 10a, which is a modified example of connection structure 10.

As shown in FIG. 7(a), in this example, a buried pipe 11a is buried in the concrete of the superstructure 2 instead of the protruding pipe 11. Unlike the protruding pipe 11, the buried pipe 11a does not protrude below the superstructure 2. On the other hand, the lower end of a bent pipe 4a, whose upper part is vertical and whose lower part is inclined, is welded to the upper end of the inclined pile 4 at a welded part 42.

By lowering the superstructure 2 from above the bent pipe 4a as shown by the arrow in Fig. 7(a), the bent pipe 4a can be inserted into the buried pipe 11a as shown in Fig. 7(b), and the upper end of the bent pipe 4a can be brought into contact with a support 113 provided inside the buried pipe 11a. The support 113 is an H-shaped steel arranged in a flat cross shape inside the buried pipe 11a, but is not limited to this.

Then, the superstructure 2 and the batter pile 4 are connected by filling the buried pipe 11a with the filler 14. The filler 14 can be a cement-based solidification material such as concrete, and the welded portion 42 is also embedded in the filler 14. In this example, there is no need to insert connecting members into the holes in the superstructure 2 and the batter pile 4 as in Patent Document 1, and the superstructure 2 and the batter pile 4 can be easily connected.

Figure 8 is a diagram illustrating connection structure 10b, which is yet another variation of connection structure 10.

In this example, as shown in FIG. 8(a), the lower end of the bent pipe 4b, which has a vertical portion at the top and an inclined portion at the bottom, is joined to the upper end of the inclined pile 4. However, the inclined portion of the bent pipe 4b is longer than the bent pipe 4a in FIG. 7, and the bent pipe 4b and the inclined pile 4 are joined by an external cannula 15 and a filler 16. In other words, with the inclined portion of the bent pipe 4b and the upper end of the inclined pile 4 inserted into the external cannula 15, the filler 16 is filled between the external cannula 15 and the bent pipe 4b and the inclined pile 4.

During actual construction, for example, the upper part of the outer cannulation pipe 15 is fixed to the inclined part of the bent pipe 4b in advance, the bent pipe 4b in this state is lowered from above the inclined pile 4, the upper end of the inclined pile 4 is inserted into the outer cannulation pipe 15 and abutted against the lower end of the bent pipe 4b, and then the filler 16 is filled in. For example, a cement-based solidification material such as concrete can be used as the filler 16.

The superstructure 2 has the same structure as in Figure 7, and by lowering the superstructure 2 from above the bent pipe 4b as shown by the arrow in Figure 8(a), the bent pipe 4b is inserted into the buried pipe 11a as shown in Figure 8(b), and the upper end of the bent pipe 4b is brought into contact with the support material 113 provided in the buried pipe 11a. After that, the buried pipe 11a is filled with the filling material 14, which makes it easy to connect the superstructure 2 and the inclined pile 4.

The above describes preferred embodiments of the present invention with reference to the attached drawings, but the present invention is not limited to these examples. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the technical ideas disclosed in this application, and it is understood that these also naturally fall within the technical scope of the present invention.

1: Pier 2: Precast superstructure 3: Vertical pile 4: Inclined pile 4a, 4b: Bent pipe 10, 10a, 10b: Connection structure 11: Protruding pipe 11a: Buried pipe 12: Joint pipe 13, 14, 16: Filling material 15: External pipe 41: Horizontal plate

Claims (5)

A connection structure between a batter pile and a concrete precast superstructure,
The upper part of the protruding pipe is embedded in the precast superstructure so as to contact the concrete of the precast superstructure,
The lower portion of the protruding pipe protrudes below the precast superstructure,
The lower end of the protruding pipe is inserted into the vertical portion of the bent joint pipe,
The upper end of the baffle pile is inserted into the inclined portion of the joint pipe,
A connection structure characterized in that a filler material is filled between the connecting pipe and the protruding pipe and between the batter pile. The batter pile has a horizontal plate at its upper end,
2. The connection structure according to claim 1, wherein a lower end of the protruding pipe is placed on the horizontal plate. The connection structure according to claim 1 or 2, characterized in that a hole for filling the filler is provided on the side of the lower part of the protruding tube. The connection structure according to any one of claims 1 to 3, characterized in that the connection structure is a connection structure between a batter pile and a precast superstructure in a pier at a port. A method for connecting a batter pile to a concrete precast superstructure by the connection structure according to any one of claims 1 to 4,
A step of inserting an upper end of the batter pile into the inclined portion of the connecting pipe to install the connecting pipe at the upper end of the batter pile;
A step of lowering the precast superstructure with the upper part of the protruding pipe buried therein from above the batter pile, and inserting the lower end of the protruding pipe protruding below the precast superstructure into the vertical part of the connecting pipe;
A step of filling a filler between the joint pipe, the protruding pipe, and the batter pile;
A connection method comprising the steps of:

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