Connection method and connection structure

Abstract

To provide a connection method etc. of a batter pile to a precast superstructure which can facilitate a construction of the precast superstructure.SOLUTION: A connection structure 10 connects a tubular batter pile 4 to a concrete precast superstructure 2. The precast superstructure 2 has holes 24 inclined to match the batter piles 4, and temporary support pipes 12 are provided at upper ends of the batter piles 4. The precast superstructure 2 is placed on a flange 121 of the temporary support pipe 12, and a filling material F is filled into the holes 24 of the precast superstructure 2 and an inside of the upper ends of the batter piles 4.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method and structure for connecting a batter pile to a precast superstructure. [Background technology]

[0002] Piers used for mooring ships, etc., have a structure in which the superstructure is supported by piles. By using batter piles as these piles, it is possible to effectively resist horizontal forces, and it is possible to omit the need to reinforce the piles with braces, etc.

[0003] The superstructure can be constructed by pouring concrete on-site, but this is strongly affected by meteorological and oceanographic conditions such as tides and waves, which poses the risk of delays in the project and impacts on quality and the environment. Furthermore, when renovating piers at private facilities currently in operation, the construction period can be lengthened, which could disrupt operational activities. For this reason, precast concrete superstructures, as in Patent Document 1, are sometimes used to shorten construction periods, streamline construction, improve quality, and ensure safety. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-152089 Summary of the Invention [Problem to be solved by the invention]

[0005] When constructing a pier using a precast superstructure, the precast superstructure is lowered vertically from above the previously cast piles and connected to the piles, but the problem here is the connection between the batter piles and the precast superstructure. Normally, holes are made in the precast superstructure to accommodate the piles, the size of which is approximately the pile diameter plus a construction error, but in the case of batter piles, the holes for inserting the piles must be larger because the piles are at an angle, and the larger holes require more time for post-construction work such as reinforcement.

[0006] On the other hand, in Patent Document 1, a curved connecting member is used to connect a batter pile to a 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 reduced, even at the connection between the batter pile and the precast superstructure.

[0007] However, in either case, when inserting the batter piles or the connecting members attached to the batter piles into holes in the precast superstructure, there is a risk that the batter piles or the connecting members will come into contact with the inner surface of the hole, which poses challenges in terms of construction of the precast superstructure.

[0008] The present invention has been made in consideration of the above problems, and aims to provide a method for connecting a batter pile to a precast superstructure, which can facilitate the construction of the precast superstructure. [Means for solving the problem]

[0009] The first invention for solving the above-mentioned problems is a method for connecting a tubular batter pile to a concrete precast superstructure, characterized in that the precast superstructure has a hole with an inclination that follows the batter pile, and the method comprises the steps of providing a temporary support pipe with a support surface on the upper end of the batter pile for placing the precast superstructure on, placing the precast superstructure on the support surface of the temporary support pipe, and filling the hole and the upper end of the batter pile with filler material to fix the precast superstructure to the batter pile.

[0010] According to the present invention, temporary support pipes are installed at the upper ends of the batter piles, and the precast superstructure is then placed on the surface on which the temporary support pipes are placed. This prevents the batter piles from coming into contact with the inner surfaces of the holes in the superstructure during installation of the precast superstructure. This makes installation of the precast superstructure easy and facilitates construction.

[0011] A sheath tube is provided along the inner surface of the hole, the placement surface is the upper surface of a flange provided at the upper end of the temporary support pipe, and it is desirable that the sheath tube be fixed to the flange before filling the filler material. This prevents the precast superstructure from shifting position after installation, allowing the precast superstructure to be positioned with high precision.

[0012] It is desirable that the temporary support pipe has an inclination along the batter pile, is fitted onto the upper end of the batter pile, has a plate attached to the inner surface of the temporary support pipe, and after the temporary support pipe is attached to the upper end of the batter pile, the upper end of the batter pile is fixed to the plate. It is also desirable to insert a wedge between the temporary support pipe and the batter pile when attaching the temporary support pipe to the upper end of the batter pile. These methods can prevent the temporary support pipes installed on the batter piles from shifting out of position. In the former case, the temporary support pipes can be securely fixed, and in the latter case, the temporary support pipes can be easily fixed using wedges.

[0013] The second invention is a connection structure between a tubular batter pile and a concrete precast superstructure, characterized in that the precast superstructure has a hole with an inclination that follows the batter pile, a temporary support pipe with a support surface on which the precast superstructure is placed is provided at the upper end of the batter pile, the precast superstructure is placed on the support surface of the temporary support pipe, and the hole and the upper end of the batter pile are filled with filler material, thereby fixing the precast superstructure to the batter pile. The connection structure is, for example, a connection structure between a batter pile and a precast superstructure in a pier at a port. The second invention is a connection structure formed by the connection method of the first invention. By using this connection structure, for example, in a pier, a precast superstructure can be easily placed on batter piles. [Effects of the Invention]

[0014] The present invention can provide a method for connecting a batter pile to a precast superstructure, which can facilitate the construction of the precast superstructure. [Brief explanation of the drawings]

[0015] [Figure 1] A diagram showing Pier 1. [Figure 2] A diagram showing the top surface of the precast superstructure 2. [Figure 3] FIG. 1 is a diagram showing a connection structure 10. [Figure 4] FIG. 10 is a diagram showing the arrangement of a plate 111. [Figure 5] FIG. 2 is an enlarged view of the gap between the steel pipe of the batter pile 4 and the connecting pipe 13. [Figure 6] A diagram showing how the batter piles 4 and the precast superstructure 2 are connected. [Figure 7] FIG. 2 is a diagram showing the upper end of the connecting pipe 13. [Figure 8] FIG. [Figure 9] FIG. 2 is a diagram showing a connection structure 10a. [Figure 10] FIG. 2 is an enlarged view showing the gap between the sheath pipe 11 and the connecting pipe 13. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0017] (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 aa in Fig. 2, which will be described later. The pier 1 is a pier installed in the coastal area of ​​a port or the like, and is used for mooring ships, etc.

[0018] The pier 1 is constructed with a precast superstructure 2 supported by vertical piles 3 and batter piles 4 driven into the ground at the bottom of the water. The precast superstructure 2 is a concrete plate-like member placed on top of the vertical piles 3 and batter piles 4. The vertical piles 3 and batter piles 4 are tubular piles made of steel pipes. Note that the pier 1 is not limited to having both the vertical piles 3 and batter piles 4, and it may also have only the batter piles 4.

[0019] Figure 2 is a top view of the precast superstructure 2. The precast superstructure (hereinafter simply referred to as the superstructure) 2 has a rectangular planar shape. The superstructure 2 has beams 21 in the long side direction and beams 22 in the short side direction arranged in a grid pattern on the underside of the deck slab. 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.

[0020] The vertical piles 3 and the batter piles 4 are connected to the superstructure 2 at the intersections of the beams 21 and 22. At the intersections where the batter piles 4 are connected, holes 24 are provided that pass through the intersections vertically. The batter piles 4 are connected using the holes 24, which are filled with a filler F made of a cement-based material such as mortar or concrete. Some of the batter piles 4 extend from the center of the superstructure 2 in the short side direction toward one end of the short side direction, and others extend toward the other end. A pair of holes 24 is provided corresponding to each of these pairs of batter piles 4.

[0021] (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 includes a sheath pipe 11, a temporary receiving pipe 12, a connecting pipe 13, and the like.

[0022] The sheath pipes 11 are steel pipes arranged along the inner surfaces of the holes 24 in the precast superstructure 2, and are provided in each of the pair of holes 24. The holes 24 have an inclination that follows the inclination direction of the batter piles 4, and the sheath pipes 11 also have a similar inclination. Two flange-shaped plates 111 are provided around the sheath pipe 11, one above the other. These plates 111 are embedded in the concrete of the superstructure 2.

[0023] Figure 4 is a top view of the arrangement of plates 111 in the superstructure 2. The plates 111 are provided in common to the sheath pipes 11 of each hole 24. The main reinforcements 23 in the long and short side directions of the superstructure 2 are fixed to these plates 111 by welding or the like. It is also possible to fix the main reinforcements 23 directly to the outer surface of the sheath pipe 11.

[0024] Returning to the explanation of Figure 3, the temporary support pipe 12 is a steel pipe fitted onto the upper end of the batter pile 4, and has an inclination that follows the inclination direction of the batter pile 4. A flange 121, which is an annular horizontal plate, is provided at the upper end of the temporary support pipe 12 along the circumferential direction of the temporary support pipe 12. The upper surface of the flange 121 is the support surface on which the superstructure 2 is placed, and abuts against the underside of the periphery of the hole 24 in the superstructure 2. At this time, the inner edge of the flange 121 protrudes inside the hole 24. In the figure, reference numeral 122 denotes a rib for reinforcing the flange 121, and is fixed to the underside of the flange 121 and the outer surface of the temporary support pipe 12 by welding or the like. A plurality of ribs 122 are provided at intervals around the circumferential direction of the temporary support pipe 12.

[0025] A horizontal plate 123 that protrudes inward of the temporary support pipe 12 is provided on the inner surface of the temporary support pipe 12, and the upper ends of the batter piles 4 are fixed to the underside of the plate 123 by welding or the like. A plurality of plates 123 are provided at intervals around the circumferential direction of the temporary support pipe 12. In the figure, reference numeral 124 denotes a rib for reinforcing each plate 123, and is fixed to the upper surface of the plate 123 and the inner surface of the temporary support pipe 12 by welding or the like.

[0026] The connecting pipe 13 is a steel pipe inserted into the hole 24 (sheath pipe 11) and the inside of the upper end of the batter pile 4. The connecting pipe 13 has an inclination that follows the inclination direction of the batter pile 4. A slit (see Figure 7 described later) is provided at the upper end of the connecting pipe 13, and a shim plate 112 fixed to the inner surface of the sheath pipe 11 by welding or the like is inserted into the slit.

[0027] The shim plate 112 is a plate material arranged with its plate surface in the vertical direction, and is made of steel plate. The shim plate 112 is fixed to the slit of the connecting pipe 13 by welding or the like, and functions as a connecting material that connects the upper end of the connecting pipe 13 to the inner surface of the sheath pipe 11, and resists the pushing force or pulling force generated in the batter pile 4.

[0028] At an intermediate portion in the axial direction of the connecting pipe 13, a protruding piece 132 is provided on the outer surface of the connecting pipe 13. The protruding piece 132 is a plate member arranged with its plate surface oriented vertically, and the lower end of the protruding piece 132 rests on the upper surface of the inner edge portion of the flange 121. The protruding pieces 132 are fixed to the outer surface of the connecting pipe 13 by welding or the like, and a plurality of the protruding pieces 132 are provided at intervals in the circumferential direction of the connecting pipe 13.

[0029] The holes 24 in the superstructure 2 and the inside of the upper ends of the batter piles 4 are filled with the filler material F. Reference numeral 133 in Figure 3 denotes a locking piece provided at the lower end of the connecting pipe 13 to secure the connecting pipe 13 to the filler material F.

[0030] Figure 5 is an enlarged view of the gap between the steel pipe of the batter pile 4 and the connecting pipe 13 inside the upper end of the batter pile 4. A shear key 41 made of a round bar or the like is fixed to the inner surface of the steel pipe at the upper end of the batter pile 4, and a shear key 134 made of a round bar or the like is also fixed to the outer surface of the lower part of the connecting pipe 13 inserted into the steel pipe. These shear keys 41, 134 enable the transmission of shear force between the steel pipe of the batter pile 4 and the connecting pipe 13 via the filler material F, integrating the batter pile 4 and the connecting pipe 13. The shear keys 41, 134 are provided in multiple rows at intervals in the axial direction of the batter pile 4 and the connecting pipe 13.

[0031] The above has been explained about 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 by a connection structure 10 similar to that shown in Figure 3, etc.

[0032] (3. Connection method between the batter pile 4 and the superstructure 2) Figure 6 is a diagram illustrating a method for connecting a batter pile 4 to a superstructure 2. In this embodiment, first, a temporary support pipe 12 is installed as shown in Figure 6(b) on the upper end of a batter pile 4 that has been driven in advance as shown in Figure 6(a). The temporary support pipe 12 is placed so as to fit onto the upper end of the batter pile 4 from above, and the upper end of the steel pipe of the batter pile 4 and a plate 123 on the inner surface of the temporary support pipe 12 are fixed by welding or the like.

[0033] Thereafter, the superstructure 2 is lowered from above the batter piles 4 and lowered vertically downward, and the superstructure 2 is placed on the upper surface (rest surface) of the flange 121 of the temporary support pipe 12, as shown in Figure 6(c). At this time, the flange 121 abuts against the underside of the periphery of the hole 24 of the superstructure 2, and the inner edge of the flange 121 protrudes inside the hole 24. By fixing the lower end of the sheath pipe 11 to the upper surface of the flange 121 by welding or the like, the superstructure 2 is prevented from shifting in position. This fixing work can be performed from above the superstructure 2.

[0034] Then, as shown in Figure 6(d), concrete Con is filled into the steel pipe of the batter pile 4, and the connecting pipe 13 is inserted into the hole 24 of the superstructure 2 and the inside of the batter pile 4. The concrete Con is filled up to below the upper end of the batter pile 4, and the lower part of the connecting pipe 13 is placed above the concrete Con and inside the upper end of the batter pile 4. At this time, the protruding piece 132 on the outer surface of the connecting pipe 13 rests on the inner edge of the flange 121 protruding inside the hole 24.

[0035] The shim plate 112 is fixed to the inner surface of the sleeve pipe 11 and the slit of the connecting pipe 13 by welding or the like.

[0036] 7(a) and (b) show the upper end of the connecting pipe 13, with Fig. 7(a) showing the state before the installation of the shim plate 112 and Fig. 7(b) showing the state after the installation of the shim plate 112. Note that the plate 111 of the sheath pipe 11 and the superstructure 2 are not shown in Figs. 7(a) and (b).

[0037] A plurality of slits 131 are provided at intervals in the circumferential direction of the connecting pipe 13, and in this embodiment, eight slits 131 are formed at equal intervals at the upper end of the connecting pipe 13. These slits 131 are provided so as to extend downward from the upper end of the connecting pipe 13 along the axial direction of the connecting pipe 13.

[0038] A plurality of shim plates 112 are also provided at intervals in the circumferential direction of the sheath pipe 11, corresponding to the positions of the slits 131. The shim plates 112 can be welded to the slits 131 at any position within the shim plates 112, and because they are retrofitted, they can accommodate slight deviations in the position or angle of the connecting pipe 13, and can absorb installation errors of the batter piles 4, superstructure 2, etc.

[0039] After this, as shown in Figure 3, filler material F is filled inside the holes 24 in the superstructure 2 and the upper ends of the batter piles 4. The flanges 121 of the temporary support pipes 12 also function as the bottom formwork when filling with filler material F, reducing the work required to set up the formwork. A sealing material (not shown) can be applied in advance to the upper surface of the flanges 121 to reliably prevent the filler material F from leaking between the superstructure 2 and the flanges 121. The filler material F is also filled inside the temporary support pipes 12, and when the temporary support pipes 12 are installed (see Figure 6(b)), a sealing material (not shown) such as a filler is also applied to close the bottom end of the gap between the temporary support pipes 12 and the batter piles 4.

[0040] Through the above process, the superstructure 2 is fixed to the batter piles 4, and the connection structure 10 shown in Figure 3 etc. is formed. In this embodiment, the superstructure 2 is made of precast members, which makes it possible to shorten the construction period and streamline construction, and since almost all of the processes after the installation of the superstructure 2 can be carried out by work on the top surface of the superstructure 2, intertidal work below the superstructure 2 is reduced and construction is easier.

[0041] As described above, according to this embodiment, the temporary support pipe 12 is provided at the upper end of the batter pile 4, and then the superstructure 2 is placed on the flange 121 of the temporary support pipe 12. Therefore, when the superstructure 2 is installed, the batter pile 4 does not come into contact with the inner surface of the hole 24 of the superstructure 2. Therefore, the superstructure 2 can be installed easily and workability is good.

[0042] In this embodiment, the sheath pipe 11 in the hole 24 of the superstructure 2 and the flange 121 of the temporary support pipe 12 are fixed by welding or the like, thereby preventing the superstructure 2 from shifting position after installation and enabling the superstructure 2 to be positioned with high precision. The work of fixing the temporary support pipe 12 and the sheath pipe 11 can also be performed from above the superstructure 2.

[0043] In addition, in this embodiment, by fixing the inner plate 123 of the temporary support pipe 12 to the upper end of the batter pile 4 by welding or the like, the temporary support pipe 12 installed on the batter pile 4 can be securely fixed and its position can be prevented from shifting.

[0044] Furthermore, the connection structure 10 of this embodiment is a connection structure between the batter piles 4 and the superstructure 2 at the pier 1 of a port, and the superstructure 2 can be easily placed on the batter piles 4 at the pier 1.

[0045] However, the present invention is not limited to the above-described embodiments. For example, in this embodiment, the connection structure 10 is applied to the pier 1 of a port, but the application of the connection structure 10 is not limited to this.

[0046] Furthermore, instead of fixing the plate 123 of the temporary support pipe 12 to the upper end of the steel pipe of the batter pile 4 by welding or the like, it is also possible to fix the temporary support pipe 12 by inserting a wedge between the temporary support pipe 12 and the steel pipe of the batter pile 4, which makes it easier to fix the temporary support pipe 12 since welding or the like is not required. Alternatively, fixation using the plate 123 and fixation using a wedge may be used in combination.

[0047] In this embodiment, the temporary support pipe 12 is fitted onto the steel pipe of the batter pile 4, but the temporary support pipe 12 may be inserted inside the steel pipe. In this case, the superstructure 2 can be placed on the flange 121 of the temporary support pipe 12.

[0048] Furthermore, the configurations of the temporary pipe 12, the sleeve pipe 11, and the connecting pipe 13 are not limited to those described above. For example, in the example of Fig. 3, the rib 122 of the temporary pipe 12 is fixed to the outer surface of the temporary pipe 12, but as shown in Fig. 8, a flange 121 and a rib 125 for reinforcing the flange 121 may be provided on the inner surface of the temporary pipe 12a. The rib 125 is fixed by welding or the like to the underside of the flange 121 and the inner surface of the temporary pipe 12a, as well as to the upper surface of the plate 123 on the inner surface of the temporary pipe 12a, and also serves to reinforce the plate 123. In this case, the outer surface of the temporary pipe 12a is made of only a smooth steel pipe, which makes it easy to apply an anti-corrosion coating and facilitates maintenance.

[0049] The temporary support pipe 12 may have a supporting surface on which the superstructure 2 is placed, and various other configurations are possible. The supporting surface is not limited to the annular flange 121 described above. Also, with regard to the sleeve pipe 11, the overlapping allowance for the temporary support pipes 12, 12a can be increased by, for example, fixing a rib (not shown) to the inner surface of the lower end portion, which abuts against the flange 121 of the temporary support pipes 12, 12a.

[0050] In this embodiment, the shim plate 112 is welded and fixed to the slit 131 of the connecting pipe 13, and the connecting pipe 13 and the sleeve pipe 11 are connected by the shim plate 112, but the shim plate 112 can be omitted as shown in a connecting structure 10a in Fig. 9. In this case, the connecting pipe 13 does not have the slit 131.

[0051] Figure 10 is an enlarged view of the gap between the sheath pipe 11 and the connecting pipe 13 in Figure 9. In this example, shear keys 113 made of round steel bars or the like are fixed in multiple rows, one above the other, to the inner surface of the sheath pipe 11, and similar shear keys 134 are also fixed in multiple rows, one above the other, to the outer surface of the upper part of the connecting pipe 13 placed inside the sheath pipe 11. These shear keys 113, 134 enable the transmission of shear force via the filler material F between the sheath pipe 11 and the connecting pipe 13, and the superstructure 2 and the connecting pipe 13 are integrated together.

[0052] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that those skilled in the art can conceive of various modifications or alterations within the scope of the technical ideas disclosed herein, and it is understood that these modifications also fall within the technical scope of the present invention. [Explanation of symbols]

[0053] 1: Pier 2: Precast superstructure 3: Vertical pile 4: Inclined stake 10, 10a: Connection structure 11: Sheath tube 12, 12a: Temporary support pipe 13: Connecting pipe 24: Hole 111, 123: Plates 121: Flange

Claims

1. A method of connecting a tubular batter pile to a concrete precast superstructure, comprising: The precast superstructure is provided with holes having an inclination along the batter piles, a step of providing a temporary support pipe having a support surface on which the precast superstructure is placed at the upper end of the batter pile; placing the precast superstructure on the placement surface of the temporary support pipe; Filling the holes and the upper ends of the batter piles with a filler material to fix the precast superstructure to the batter piles; A connection method comprising:

2. a sheath tube is provided along the inner surface of the hole; the placement surface is an upper surface of a flange provided at an upper end of the temporary receiving pipe, 2. The connecting method according to claim 1, wherein the sleeve pipe is fixed to the flange before the filler is filled.

3. The temporary support pipe has an inclination along the batter pile and is fitted onto the upper end of the batter pile; a plate is provided on the inner surface of the temporary receiving pipe; 2. The connection method according to claim 1, wherein the temporary support pipe is provided at the upper end of the batter pile, and then the upper end of the batter pile is fixed to the plate.

4. The temporary support pipe has an inclination along the batter pile and is fitted onto the upper end of the batter pile; 2. A connection method according to claim 1, wherein when the temporary support pipe is provided at the upper end of the batter pile, a wedge is inserted between the temporary support pipe and the batter pile.

5. A connection structure between a tubular batter pile and a concrete precast superstructure, The precast superstructure is provided with holes having an inclination along the batter piles, A temporary support pipe having a support surface on which the precast superstructure is placed is provided at the upper end of the batter pile, The precast superstructure is placed on the placement surface of the temporary support pipe, A connection structure characterized in that the precast superstructure is fixed to the batter piles by filling the holes and the upper ends of the batter piles with filler material.

6. 6. The connection structure according to claim 5, wherein the connection structure is a connection structure between a batter pile and a precast superstructure in a pier at a port.

Images