Grid members, steel pipe columns, grid structures and road structures

Abstract

To provide a panel point member, a steel pipe column, a panel point structure, and a road structure for suppressing filling failure of a filler in a filling space in which a rib is installed.SOLUTION: A panel point member filled with a filler inside and fixed to a part of a steel pipe column includes a cylindrical body surrounding an outer surface of the steel pipe column, and the cylindrical body includes a plurality of inner ribs projecting from an inner peripheral surface. Each of the plurality of inner ribs is a panel point member in which the longitudinal direction extends in the circumferential direction when viewed in the central axis direction, and one end part in the circumferential direction is disposed at a position shifted in the central axis direction of the cylindrical body with respect to the other end portion.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a grid point member, a steel pipe column, a grid point structure, and a road structure that are installed on pillars that support roads, etc. [Background technology]

[0002] For example, when building a road in a mountainous region, the existing slope is cut in the areas higher than the planned road surface height, and embankments are built in the areas lower to create a flat road surface. In this case, the existing slope is altered, which has a significant impact on the living environment of plants and living creatures, and is often undesirable from an environmental conservation perspective. Furthermore, when building a bridge in a valley, large piers must be built on the slope, which requires large-scale excavation and foundation work. This not only has a significant impact on the environment, but also lengthens the construction period and increases costs. Therefore, a pier-style road structure has been devised, in which piles are installed on the slope and girders and road decks are then installed on top of them.

[0003] When constructing roads and other structures, a construction method is commonly used: driving multiple steel pipe columns (steel pipe piles) into mountain slopes, connecting main girders and cross girders to the tops of adjacent steel pipe columns, and laying a deck slab on top of them. However, the steel pipe columns are subject to large construction errors, such as a deviation (misalignment) of approximately 100 mm from the design value, making construction difficult using prefabricated girder components. To address this issue, a known structure is a panel point structure, in which a panel point member (panel point block) is placed over the end of a steel pipe column, connecting the steel pipe column and the panel point member with the central axis of the steel pipe column eccentric to that of the panel point member. In this panel point structure, a filler material such as concrete is filled between the steel pipe column and the cylindrical body of the panel point member. Ribs (shear keys) are provided on the outer surface of the steel pipe column and the inner surface of the cylindrical body of the panel point member to ensure strong adhesion of concrete (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-117274 Summary of the Invention [Problem to be solved by the invention]

[0005] From the perspective of reducing the volume of the filling space filled with filler, it is desirable to minimize the difference between the outer diameter of a steel pipe column in a lattice structure and the inner diameter of the tubular lattice member. However, due to construction errors in the steel pipe column, the central axes of the steel pipe column and the tubular lattice member become eccentric, partially narrowing the gap between the outer surface of the steel pipe column and the inner circumferential surface of the tubular lattice member. This narrows the gap between the ribs provided on the steel pipe column and the tubular lattice member. The flow of filler material is easily obstructed in areas where the ribs are close to each other. Furthermore, aggregate with large particle diameters contained in the filler material may become trapped between the ribs, hindering filling. Furthermore, air bubbles mixed in the filler material may remain on the underside of the ribs without completely escaping upward. These factors have led to the problem of air bubbles forming in the filler material around areas where the ribs are close to each other, resulting in poor filling.

[0006] The present invention solves the above-mentioned problems and aims to provide a lattice point member, a steel pipe column, a lattice point structure and a road structure that suppresses poor filling of the filling material in the filling space where the rib is installed. [Means for solving the problem]

[0007] The grid point member according to the present invention is a grid point member filled with a filler material and fixed to a part of a steel pipe column, and includes a cylindrical body surrounding the outer surface of the steel pipe column, and the cylindrical body includes a plurality of inner ribs protruding from the inner peripheral surface, and each of the plurality of inner ribs extends in the circumferential direction when viewed from the central axis direction, and is arranged at an incline so that one end in the circumferential direction is shifted relative to the other end in the central axis direction of the cylindrical body, and air bubbles are discharged along the incline. The adjacent inner ribs are formed with a space communicating in the central axis direction between their adjacent ends. .

[0009] The steel pipe column according to the present invention is a steel pipe column erected on the ground and having a lattice member fixed to a part thereof, and has an outer rib protruding from the outer surface, and the outer rib is arranged so that the longitudinal direction thereof extends in the circumferential direction when viewed from the central axis direction, and one end of the outer rib is positioned at an incline so as to be shifted in the central axis direction relative to the other end, and air bubbles are discharged along the incline. The adjacent outer ribs are formed with a space communicating in the central axis direction between their adjacent ends. .

[0011] The grid point structure according to the present invention is a grid point structure formed by filling a filler material inside a grid point member and fixing it to a steel pipe column, wherein the grid point member comprises a cylindrical body surrounding the outer surface of the steel pipe column, the cylindrical body having an inner rib protruding from its inner peripheral surface, the steel pipe column having an outer rib protruding from its outer surface, the inner rib and the outer rib each having a longitudinal direction extending in the circumferential direction when viewed from the central axis direction, and one end in the circumferential direction is disposed at an incline so as to be shifted from the other end in the direction of the central axis of the steel pipe column, and air bubbles are discharged along the incline. The inner rib and the outer rib arranged adjacent to each other are formed with a space communicating in the central axis direction between their adjacent ends. .

[0012] The grid point structure according to the present invention is a grid point structure formed by filling a filler material inside a grid point member and fixing it to a steel pipe column, wherein the grid point member comprises a cylindrical body surrounding the outer surface of the steel pipe column, the cylindrical body having an inner rib protruding from its inner peripheral surface, the steel pipe column having an outer rib protruding from its outer surface, the inner rib and the outer rib being arranged on the same circumference, and the outer rib being arranged at an angle to the inner rib at a position shifted in the direction of the central axis of the steel pipe column, so that air bubbles are discharged along the angle. The inner rib and the outer rib arranged adjacent to each other are formed with a space communicating in the central axis direction between their adjacent ends. .

[0014] The road structure according to the present invention comprises a plurality of the steel pipe columns driven into the ground and any one of the grid point structures described above. [Effects of the Invention]

[0015] According to the present invention, even if the steel pipe column and the lattice point member are eccentric, air bubbles or aggregate with large particle diameters can be easily removed, so poor filling of the filler can be suppressed even if the ribs are placed close to each other. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic diagram of a road structure 100 according to a first embodiment as viewed from the side. [Figure 2] 2 is an explanatory diagram of the cross-sectional structure of the road structure 100 of FIG. 1 taken along line AA. [Figure 3] 2 is an explanatory diagram of the cross-sectional structure of the BB portion of the road structure 100 of FIG. 1. [Figure 4] 2 is an explanatory diagram of a cross-sectional structure of a CC portion of the road structure 100 of FIG. 1. [Figure 5] FIG. 2 is a layout diagram of the girder members 41 of the road structure 100 of FIG. [Figure 6] 4 is an explanatory diagram of a cross-sectional structure of a grid point structure 60a according to the first embodiment. FIG. [Figure 7] FIG. 2 is a top view of a grid structure 60a according to the first embodiment. [Figure 8] 3 is an explanatory diagram of the structure of a form jig 70 used in the temporary joining step of the first embodiment. FIG. [Figure 9] FIG. 2 is a side view showing an example of a covering plate. [Figure 10] 10 is an explanatory diagram of a cross-sectional structure of a grid point structure 160, which is a comparative example of the grid point structure 60a according to the first embodiment. FIG. [Figure 11] FIG. 11 is an enlarged view of a portion D2 in FIG. [Figure 12] 10 is an explanatory diagram of a cross-sectional structure of a grid point structure 60b, which is a modified example of the grid point structure 60a according to the first embodiment. FIG. [Figure 13] FIG. 13 is a cross-sectional view of the SS portion of FIG. [Figure 14] 10 is an explanatory diagram of a cross-sectional structure of a grid point structure 60c, which is a modified example of the grid point structure 60a according to the first embodiment. FIG. [Figure 15] 10 is an explanatory diagram of a cross-sectional structure of a grid point structure 60d, which is a modified example of the grid point structure 60c according to the first embodiment. FIG. [Figure 16] 10 is an explanatory diagram of a cross-sectional structure of a grid point structure 260a according to the second embodiment. FIG. [Figure 17] 10 is an explanatory diagram of a cross-sectional structure when an outer rib 213 of a grid structure 260a according to the second embodiment is wound in the reverse direction. FIG. [Figure 18] 18 is a perspective view illustrating the positional relationship between an outer rib 213 and an inner rib 254 in FIG. 17. FIG. [Figure 19] 10 is an explanatory diagram of a cross-sectional structure of a grid point structure 360a according to the third embodiment. FIG. [Figure 20] 10 is an explanatory diagram of a cross-sectional structure of a grid point structure 460a according to the fourth embodiment. FIG. [Figure 21] 10 is a cross-sectional view of a ribbed steel strip that constitutes a support pile 10 or a grid point member 50a according to a fourth embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments described below. Each figure is a schematic illustration, and the relative size and thickness of each member are not limited to the dimensions shown. Furthermore, the size relationships between each component member in the following drawings may differ from the actual ones.

[0018] Embodiment 1 FIG. 1 is a schematic diagram of a road structure 100 according to a first embodiment, as seen from the side. FIG. 2 is an explanatory diagram of the cross-sectional structure of section AA of the road structure 100 of FIG. 1. FIG. 3 is an explanatory diagram of the cross-sectional structure of section BB of the road structure 100 of FIG. 1. FIG. 4 is an explanatory diagram of the cross-sectional structure of section CC of the road structure 100 of FIG. 1. FIG. 5 is a layout diagram of girder members 41 of the road structure 100 of FIG. 1. The road structure 100 is installed on undulating ground such as in mountainous areas. The road structure 100 is a structure used, for example, when building a road along a slope in a mountainous area, when widening an existing road built along a slope, or when building a road across a stream in a mountainous area. In the first embodiment, a road structure 100 installed along a slope in a mountainous area will be described as an example.

[0019] The road structure 100 comprises a plurality of steel pipe poles 20 driven into the ground 90. The steel pipe poles 20 are erected in holes made in the ground 90 so that the pile heads 12 protrude from the surface 94 of the ground 90. The ground 90 is drilled using a down-the-hole hammer or the like to penetrate a sedimentary layer 92 and reach a supporting layer 93. The steel pipe poles 20 are erected in the ground 90 by erecting the steel pipe poles 20 in the holes made in the ground 90 and filling the holes with a filler material such as concrete or mortar. The steel pipe poles 20 erected in the ground 90 are also referred to as support piles 10b.

[0020] A plurality of steel pipe poles 20 are cast into the ground 90 in parallel in a first direction, which is the direction in which the road extends. As shown in FIG. 5 , girder members 41 are arranged curved along, for example, a slope, and the road is constructed by placing a road deck 99 on the girder members 41. The first direction is the direction along this road. The plurality of steel pipe poles 20 of the road structure 100 include a first steel pipe pole 20a and a second steel pipe pole 20b. A steel pipe pole 30 is connected to the upper part of the first steel pipe pole 20a. An upper end lattice member 50a is fixed to the upper end of the second steel pipe pole 20b.

[0021] The steel pipe pole 30 is joined to the upper end of the first steel pipe pole 20a according to the height from the surface 94 of the ground 90 on which the road deck 99 and the girder member 41 are to be installed. The steel pipe pole 30 joined to the upper end of the first steel pipe pole 20a is also referred to as a steel pipe support pole. In addition, the structure in which the first steel pipe pole 20a and the steel pipe pole 30 are connected is also referred to as a support pile 10a.

[0022] The triangular symbol shown in Fig. 1 indicates a joint 11 between the first steel pipe column 20a and the steel pipe column 30. At the joint 11, the steel pipe column 20a located on the ground 90 side is joined to the steel pipe column 30 joined above it by a lattice point structure 60d (see Fig. 15). Note that columnar structures erected on the ground 90 may be collectively referred to as a support pile 10. In particular, the structure in which the above-mentioned first steel pipe column 20a and the steel pipe column 30 are joined may be referred to as a support pile 10a. Furthermore, the lattice point structures 60a to 60d provided on the support pile 10 may be collectively referred to as a lattice point structure 60.

[0023] 1 and 5, each upper-end panel point member 50a is connected to an adjacent upper-end panel point member 50a in the first direction by a beam member 41. The beam member 41 installed along the first direction is specifically called a vertical beam 41a. The first direction is the direction in which the road extends, and corresponds to the y-axis direction in FIG. 1.

[0024] 2 to 5, each upper-end panel point member 50a is connected to an adjacent upper-end panel point member 50a arranged in parallel in a second direction intersecting the first direction by a beam member 41. The beam member 41 installed along the second direction is specifically called a cross beam 41b. The second direction corresponds to the x-axis direction in FIGS. 2 to 4.

[0025] As shown in Fig. 2, two steel pipe columns 20b are driven into the ground 90 and are arranged side by side in a second direction that intersects with the first direction. The cross beam 41b connects the pile heads 12 of the steel pipe columns 20b arranged side by side in the second direction via upper end lattice members 50a. As shown in Fig. 5, adjacent steel pipe columns 20b are connected by the cross beam 41b in the second direction and by the vertical beam 41a in the first direction.

[0026] As shown in Figure 3, the steel pipe column 30 is joined to the pile head 21a of the first steel pipe column 20a and extends upward. An upper-end lattice point member 50a is joined to the pile head 12 of the support pile 10a formed by the first steel pipe column 20a and the steel pipe column 30. The upper-end lattice point member 50a is joined to the pile head 12 of the steel pipe column 30 to form a lattice point structure 60a (see Figure 6).

[0027] The second steel pipe column 20b erected on the ground 90 has an upper-end lattice point member 50a connected to its pile head 12. The upper-end lattice point member 50a is joined to the pile head 12 of the second steel pipe column 20b to form a lattice point structure 60a shown in FIG.

[0028] The upper end lattice point member 50a joined to the pile head 12 of the support pile 10a composed of a first steel pipe column 20a and a steel pipe column 30 is connected to the upper end lattice point member 50a joined to the pile head 12 of the second steel pipe column 20b arranged adjacent to it in the second direction by a cross beam 41b.

[0029] As in the second steel pipe column 20b shown first and second from the left or right in Fig. 1, the upper-end panel point member 50a joined to the second steel pipe column 20b is connected to the upper-end panel point member 50a adjacent in the first and second directions, similar to the upper-end panel point member 50a joined to the support pile 10a. The second steel pipe column 20b may also be referred to as the support pile 10b.

[0030] Here, the vertical beams 41a and horizontal beams 41b are collectively referred to as girder members 41. As shown in Figures 1 to 5, the girder members 41 are installed along the first direction and the second direction, and each connects the pile heads 12 of the support piles 10 via an upper end panel point member 50a. Deck slab fixing members 42 (see Figure 5) are installed on the upper surfaces of the girder members 41 and the upper end panel point member 50a. The road deck slab 99 is fixed to the girder members 41 and the upper end panel point member 50a via the deck slab fixing member 42. Two or more steel pipe columns 20 may be arranged in a second direction that intersects the first direction.

[0031] 5, the horizontal beam 41b may have a connecting portion 43 in the center. The vertical beam 41a is connected to the connecting portion 43. The vertical beam 41a connected to the connecting portion 43 connects the connecting portions 43 of the horizontal beams 41b adjacent to each other in the first direction.

[0032] As shown in Fig. 1, an intermediate panel point member 50b is provided on the support pile 10a. In the first embodiment, the intermediate panel point member 50b is installed in the center of the steel pipe column 30 of the support pile 10a. In other words, the intermediate panel point member 50b is provided on the support pile 10a that has a large protruding length from the ground 90 in the road structure 100. The intermediate panel point member 50b is connected to the intermediate panel point members 50b provided on the adjacent steel pipe columns 30 by the beam members 40. The beam members 40 installed along the first direction are particularly referred to as vertical beams 40a.

[0033] As shown in Figure 4, the intermediate panel members 50b are connected to the intermediate panel members 50b installed on the adjacent support piles 10 in a second direction intersecting the first direction by the beam members 40. The beam members 40 installed along the second direction are particularly referred to as cross beams 40b.

[0034] The beam members 40 may be installed at an angle as shown in Figures 1 and 3, or may be installed horizontally as shown in Figure 4. Furthermore, the intermediate panel point members 50b are not limited to those installed on the steel pipe column 30 as shown in Figures 1 and 4, but may also be installed on the second steel pipe column 20b as shown in Figure 3. A panel point structure 60b using the intermediate panel point members 50b will be described later.

[0035] (Structure of upper end grid point member 50a) FIG. 6 is an explanatory diagram of the cross-sectional structure of a panel structure 60a according to the first embodiment. FIG. 7 is a top view of the panel structure 60a according to the first embodiment. The upper-end panel point member 50a and the pile head 12 of the support pile 10 are joined to form the panel structure 60a. The panel structure 60a combines a portion of the upper-end panel point member 50a with the pile head 12 of the support pile 10, and joins the upper-end panel point member 50a and the support pile 10 while adjusting the position of the upper-end panel point member 50a relative to the pile head 12. The panel structure 60a joins the upper-end panel point member 50a and the support pile 10 by filling a filler 80 such as concrete or mortar between the cylindrical body 51a constituting the upper-end panel point member 50a and the outer surface of the pile head 12. In other words, the upper-end panel point member 50a can be joined to the support pile 10 even if the central axis of the upper-end panel point member 50a is misaligned with that of the support pile 10.

[0036] In the first embodiment, the grid structure 60a includes at least an upper grid point member 50a. The upper grid point member 50a is composed of a cylindrical body 51a and a support member 55a. The cylindrical body 51a is formed from a steel pipe. In the first embodiment, the cylindrical body 51a has a cylindrical shape. A support member 55a is installed at the top of the interior of the cylindrical body 51a. The support member 55a passes through the central axis C of the cylindrical cylindrical body 51a and is formed by combining plate-like members in a cross shape.

[0037] As shown in Figure 7, the upper end lattice point member 50a has stringer joints 52a and crossbeam joints 53a to which the girder member 41 is connected. The stringer joints 52a and crossbeam joints 53a and the girder member 41 (see Figure 5) are connected by sandwiching the end of the stringer joint 52a or crossbeam joint 53a and the end of the girder member 41 with a splice plate 44 (see Figure 5), and then fixing the end of each member to the splice plate 44 with bolts and nuts.

[0038] The upper-end grid point member 50a has a plate-like member attached to its upper portion, and has a flat upper surface 57a. The upper surface 57a may be inclined to match the slope of the road, for example. A filling hole 56a is formed in the upper surface 57a, penetrating an upper plate 58, which is a plate-like member. The filling hole 56a is a hole for injecting filler material 80 into the space between the outer surface of the pile head 12 and the inner surface of the cylindrical body 51a, and connects the outside with the space inside the cylindrical body 51a.

[0039] The underside of the support member 55a abuts against the end face 14 of the pile head 12 of the support pile 10a or 10b. The abutment between the underside of the support member 55a and the end face 14 of the pile head 12 determines the position of the upper-end lattice point member 50a along the central axis of the support pile 10, i.e., its height. The cylindrical body 51a surrounds the outer surface of the upper end of the support pile 10. Before the filler material 80 is injected, a gap is formed between the inner surface of the cylindrical body 51a and the outer surface of the support pile 10, allowing the upper-end lattice point member 50a to move horizontally relative to the support pile 10 by the amount of the gap. As shown in Figure 7, the support member 55a is formed by combining plate-shaped members in a cross shape, but other configurations are also possible. The support member 55a may have other structures as long as the upper-end lattice point member 50a can be placed on the end face 14 of the pile head 12 and does not interfere with the injection of the filler material 80.

[0040] The position of the pile head 12 of the support pile 10 may deviate from the intended position. If the amount of protrusion from the surface 94 of the ground 90 is large, the positional error of the pile head 12 may become large depending on the accuracy of the steel pipe column 20 and the steel pipe column 30 connected to its upper end, as well as the accuracy of their joint. For example, assume that the tubular body 51a of the upper-end lattice point member 50a is cylindrical, the pile head 12 is cylindrical, and the inner diameter of the tubular body 51a is set to be 200 mm larger than the outer diameter of the pile head 12. In this case, even if the pile head 12 has a horizontal positional error of up to 100 mm, the upper-end lattice point member 50a can absorb the error and install it in the correct position.

[0041] The filler 80 is filled into the gap between the cylindrical body 51a and the pile head 12 through filling holes 56a opening in the upper surface 57a of the upper-end lattice member 50a. The cylindrical body 51a is open at the bottom. Therefore, during the filling process of the filler 80, a formwork jig 70 (see FIG. 8) is abutted against the lower end surface of the cylindrical body 51a to close the opening so that the filler 80 does not leak out from below. The formwork jig 70 will be described separately. Ribs 54 and ribs 13 are provided on the inner surface of the cylindrical body 51a and the outer surface of the pile head 12, which form the gap between the cylindrical body 51a and the pile head 12 into which the filler 80 is filled. The ribs 54 protruding from the inner surface of the cylindrical body 51a are referred to as inner ribs 54. The ribs 13 protruding from the outer surface of the support pile 10 are referred to as outer ribs 13. Because the ribs 54 and 13 engage with the solidified filler material 80, the filler material 80 does not shift in the direction along the inner surface of the cylindrical body 51a and the outer surface of the pile head 12, thereby improving load transmission between the upper end lattice point member 50a and the support pile 10.

[0042] The ribs 13 and 54 are formed by bending steel bars, deformed steel bars, or steel plates and then welding them together. The ribs 13 and 54 may be fixed outside the installation site. Alternatively, they may be fixed to the outer surface of the steel pipe column 30 in accordance with the position of the inner rib 54 of the cylindrical body 51a of the upper end lattice point member 50a.

[0043] As shown in Figure 6, multiple outer ribs 13 are provided on the pile head 12 of the support pile 10 in the direction of the central axis C1 of the support pile 10. Each of the outer ribs 13 is arranged on the same circumference centered on the central axis C1 along the outer surface 12a. In Figure 6, the outer ribs 13 are arranged at three locations spaced apart from the end face 14, but the number and positions can be changed as appropriate.

[0044] A plurality of inner ribs 54 are provided on the inner peripheral surface of the cylindrical body 51a of the grid point member 50a in the direction of the central axis C2 of the cylindrical body 51a. Each of the inner ribs 54 is arranged on a circle centered on the central axis C2 along the inner peripheral surface of the cylindrical body 51a. In FIG. 6, the inner ribs 54 are arranged at three locations spaced apart from the support member 55a, but the number and positions can be changed as appropriate. Note that the central axis C1 of the support pile 10 and the central axis C2 of the cylindrical body 51a of the grid point member 50a are horizontally offset, but will coincide when the pile head 12 of the support pile 10 is in the correct position according to the design. Furthermore, the central axes C1 and C2 are substantially parallel.

[0045] The outer rib 13 and the inner rib 54 are arranged with a shift in the height direction, i.e., in the direction of the central axis C1 or C2. The outer rib 13 is arranged between the inner ribs 54 located above and below in the direction of the central axis C1. In FIG. 6, the outer rib 13 is arranged in the center between the inner ribs 54 located above and below, but this is not limited to this, and the outer rib 13 may be arranged with a shift toward one of the inner ribs 54 located above or below.

[0046] (Construction method of road structure 100 and grid structure 60a) A construction method for the lattice structure 60a according to the first embodiment will now be described. As shown in Figs. 1 to 4, in the road structure 100, steel pipe columns 20 are first driven into the ground 90 in parallel in a first direction in which the road extends and a second direction intersecting the first direction. This process is called the steel pipe column driving process. In the steel pipe column driving process, holes are first drilled into the ground 90 using a down-the-hole hammer or the like to form holes into which the steel pipe columns 20 will be erected. The holes penetrate the sedimentary layer 92 on the surface 94 side of the ground 90 and reach the supporting layer 93.

[0047] A plurality of steel pipe poles 20 are used in the road structure 100. All of the plurality of steel pipe poles 20 are driven into the ground 90 by the above-described steel pipe pole driving step.

[0048] Next, a steel pipe column 30 is erected to a first steel pipe column 20a of the multiple steel pipe columns 20 using a lattice structure 60d (see FIG. 15 ). The steel pipe column 30 is temporarily joined to the first steel pipe column 20a of the multiple steel pipe columns 20, and the support pile 10a is temporarily assembled. Furthermore, an upper-end lattice point member 50a is temporarily joined to the pile head 12 of the support pile 10a and the pile head 21b of a second steel pipe column 20b of the multiple steel pipe columns 20. The temporary joining is a process of temporarily installing the upper-end lattice point member 50a to the pile head 12 of the second steel pipe column 20b or the steel pipe column 30 using a formwork jig 70 (see FIG. 8 ), and installing an intermediate lattice point member 150b (see FIG. 15 ) and the steel pipe column 30 to the pile head 12 of the steel pipe column 20a; this process is called the temporary joining process. Details of the temporary joining process are described below.

[0049] Fig. 8 is an explanatory diagram of the structure of a form jig 70 used in the temporary joining step of embodiment 1. Fig. 8 shows a case where an upper-end panel point member 50a is installed on the pile head 12 of a steel pipe column 20b, but the method of using the form jig 70 is the same when an intermediate panel point member 50b, which will be described later, is installed on the pile head 12 of a steel pipe column 20a.

[0050] The formwork jig 70 includes a bracket 71 that supports a formwork plate 74. The bracket 71 is connected to a fixing band 73. The fixing band 73 is detachably fixed to the steel pipe column 20 so as to surround the outer surface of the steel pipe column 20, and fixes the position of the bracket 71. The process of installing the formwork jig 70 on the steel pipe column 20 using the fixing band 73 is specifically called the formwork installation process. The formwork installation process is included in the temporary joining process.

[0051] The upper-end panel point member 50a in Figure 8 is installed so that the form plate 74 of the form jig 70 abuts against the lower end surface of the cylindrical body 51b. This process is called the cylindrical body installation process. The cylindrical body installation process is included in the joining process. The form plate 74 is installed so that the filler material 80 injected into the inside of the upper-end panel point member 50a does not leak out.

[0052] The bracket 71 is equipped with an adjustment bolt 75. The tip of the adjustment bolt 75 abuts against the outer peripheral surface of the cylindrical body 51b of the upper-end panel point member 50a, which is placed on the formwork plate 74. The adjustment bolt 75 is threadedly engaged with a nut member 76, which allows the position of the tip to be adjusted with high precision and also allows the position of the cylindrical body 51b of the upper-end panel point member 50a to be temporarily fixed. The process of adjusting and fixing the horizontal position of the cylindrical body 51a of the upper-end panel point member 50a in this way is called the fixing process. The fixing process is included in the temporary joining process.

[0053] In the road structure 100 according to the first embodiment, by using the formwork jig 70 as described above, the support piles 10a and 10b can be temporarily assembled without injecting the filler material 80 into the grid members 50. Therefore, a lining plate 399 (see FIG. 9) can be placed on the temporarily assembled support piles 10a and 10b, and the support piles 10a and 10b can be erected one after another in a first direction along the road. In other words, the steel pipe driving process and the temporary joining process are alternately repeated until the support piles 10a and 10b for the entire length of the road or for a predetermined length of road have been erected. The above processes are collectively referred to as the support pile erection process.

[0054] The support piles 10a and 10b are erected in the support pile erection process, and once the upper-end panel point members 50a are temporarily fixed to the pile heads 12 of the support piles 10a and 10a, filler material 80 is injected into the panel point members 50. This process is called the injection and solidification process. The formwork jig 70 is removed once the filler material 80 has solidified. The panel point members 50 collectively refer to the upper-end panel point members 50a and the intermediate panel point members 50b and 150b, which will be described later. It is recommended that the injection and solidification process be carried out for all panel point members 50 after the support piles 10a and 10b in a temporarily assembled state for the entire length of the road have been erected.

[0055] When the road structure 100 is installed without using the formwork jig 70, the first support pile 10 is erected in a first direction along the road, and after the filler material 80 injected into the lattice members 50 has hardened, a lining plate is installed on top of the support pile 10. Then, heavy machinery is placed on top of the installed lining plate 399, and the next support pile 10 is erected. In this process, the injection and hardening process of the filler material 80 is required each time a support pile 10 is erected, which lengthens the construction period. On the other hand, the road structure 100 has the advantage that the use of the formwork jig 70 reduces the number of times the injection and hardening process of the filler material 80 is performed, thereby shortening the construction period.

[0056] After the injection and solidification process is completed, the road structure 100 has the covering plate 399 removed and the road deck 99 installed.

[0057] Fig. 9 is a side view showing an example of a lining plate. The lining plate is placed on top of the temporarily assembled support pile 10 when the steel pipe column driving process and the temporary joining process are repeated. The lining plate 399 shown in Fig. 9 is equipped with a temporary pile head block 350a. Therefore, the pile head block 350a can be fitted into the pile head 12 and the lining plate 399 can be installed without installing the upper end lattice point member 50a of the road structure 100. By using such a lining plate 399, only the steel pipe column driving process can be performed at once, thereby reducing the time the pile driver is detained.

[0058] (Regarding the comparative example, case structure 160) 10 is an explanatory diagram of the cross-sectional structure of a panel structure 160, which is a comparative example of the panel structure 60a according to the first embodiment. In the comparative panel structure 160, the outer rib 13 provided on the outer surface of the support pile 10 and the inner rib 54 on the inner peripheral surface of the cylindrical body 51a of the panel member 50a are arranged at the same height in the directions of the central axes C1 and C2. Therefore, when the pile head 12 of the support pile 10 and the panel member 50a are arranged eccentrically, the outer rib 13 and the inner rib 54 are arranged close to each other. Alternatively, the outer rib 13 and the inner rib 54 may come into contact with each other.

[0059] Figure 11 is an enlarged view of part D2 in Figure 10. When filling the gap between the upper-end panel point member 50a and the pile head 12 with filler material 80, the filler material 80 is injected through the filling hole 56a. Although not shown in Figure 11, when injecting the filler material 80, the formwork jig 70 is placed in contact with the lower end of the upper-end panel point member 50a, as shown in Figure 8. Therefore, the filler material 80 injected through the filling hole 56a gradually flows from the upper surface of the formwork plate 74 and accumulates upward. However, there are some areas where the inner rib 54 of the upper-end panel point member 50a and the outer rib 13 of the pile head 12 are close to each other, and in these areas the flow may be obstructed.

[0060] The distance w shown in FIG. 11 indicates the dimension of the gap where the outer rib 13 and the inner rib 54 of the comparative lattice structure 160 are closest to each other. For example, if the inner diameter of the cylindrical body 51a is 700 mm, the outer diameter of the pile head 12 is 500 mm, the outer diameters of the outer rib 13 and the inner rib 54 are 9 mm, and the eccentricity between the cylindrical body 51a and the pile head 12 is 70 mm, the distance w is 12 mm. In this case, if the filler 80 is concrete with aggregate 81a having a maximum particle size of 20 mm, the aggregate 81a will be caught between the outer rib 13 and the inner rib 54, as shown in FIG. 11, for example. As a result, aggregate 81b with a relatively small particle size or cement cannot pass through the area where the outer rib 13 and the inner rib 54 are closest to each other, resulting in a space not filled with concrete, for example, in region F shown in FIG. 11. Furthermore, even if the aggregates are not large aggregates 81a but medium-sized aggregates, a plurality of aggregates may be combined together and get caught between the outer rib 13 and the inner rib 54.

[0061] In the grid structure 160, if there are gaps that are not filled with the filler 80, there is a risk that cracks will occur in the filler 80 starting from the gaps. In addition, moisture that accumulates in the gaps may cause corrosion of the steel material that constitutes the cylindrical body 51a.

[0062] (Function of the grid structure 60a of the first embodiment) In the panel point structure 60a according to the first embodiment, the outer rib 13 and the inner rib 54 are disposed at positions separated from each other in the direction of the central axis C1. Therefore, even if the cylindrical body 51a and the pile head 12 of the panel point member 50a become eccentric, the distance between the outer rib 13 and the inner rib 54 does not become close to each other. This improves the adhesive force between the cylindrical body 51a and the pile head 12 of the panel point member 50a and the filler 80, while preventing improper filling of the filler 80. Furthermore, compared to the panel point structure 160 of the comparative example, the amount of eccentricity between the panel point member 50a and the pile head 12 can be made larger.

[0063] (Variation) Fig. 12 is an explanatory diagram of the cross-sectional structure of a grid point structure 60b, which is a modified example of the grid point structure 60a according to embodiment 1. Fig. 13 is a cross-sectional view of the SS portion of Fig. 12. In the modified grid point structure 60b, the inner rib 54 provided on the cylindrical body 51a of the grid point member 50a and the outer rib 13 of the pile head 12 are arranged at the same height. However, the inner rib 54 and the outer rib 13 have been partially removed. In other words, multiple ribs 54 or 13 are formed on the same circumference.

[0064] As shown in Figure 13, the inner rib 54 and the outer rib 13 are divided into four locations, but the number of divisions and the width of the notches 54a or 13a of the rib 54 or 13 can be changed as needed. This configuration reduces the likelihood of narrow areas forming when the grid point member 50a and the support pile 10 are eccentric, causing the inner rib 54 and the outer rib 13 to approach each other and trapping the aggregate. Even if a narrow area does occur, air bubbles will escape through the nearby notches 54a or 13a, preventing improper filling of the filler 80.

[0065] In Figure 13, the positions of the notches 54a and 13a are not the same in the circumferential direction. This ensures the effect of suppressing imperfect filling regardless of the direction of eccentricity between the grid point member 50a and the pile head 12. To further improve the effect of suppressing imperfect filling, it is desirable to increase the number or width of the notches 54a or 13a.

[0066] The inner ribs 54 and outer ribs 13 of the grid structure 60b in FIG. 12 may be offset from each other along the central axes C1 and C2. In this case, the grid structure 60b corresponds to the grid structure 60a in FIG. 6, except that the inner ribs 54 and outer ribs 13 are provided with cutouts 54a and 13a. This configuration prevents the distance w between the inner ribs 54 and outer ribs 13 from becoming too close. Furthermore, the cutouts 54a and 13a in the inner ribs 54 and outer ribs 13 improve the fluidity of the filler 80, making it easier for air bubbles to escape. The inner ribs 54 and outer ribs 13 are internal irregularities in the grid structures 60a and 60b that impede the flow of the filler 80, but the cutouts 54a and 13a alleviate this.

[0067] (Structure of intermediate lattice member 50b) 14 is an explanatory diagram of the cross-sectional structure of a panel point structure 60c, which is a modified example of the panel point structure 60a according to Embodiment 1. The intermediate panel point member 50b and the support pile 10 are joined by the panel point structure 60c. The panel point structure 60c combines the intermediate panel point member 50b with the support pile 10 and fixes the intermediate panel point member 50b to the support pile 10 while adjusting the position of the intermediate panel point member 50b relative to the support pile 10. In other words, the panel point structure 60b allows the intermediate panel point member 50b to be joined to the support pile 10 even when the position of its central axis is misaligned with that of the support pile 10.

[0068] In the first embodiment, the grid point structure 60c is composed of at least a cylindrical body 51b that constitutes an intermediate grid point member 50b. The cylindrical body 51b is made of a steel pipe and has a cylindrical shape in the first embodiment. The cylindrical body 51b that surrounds the support pile 10 can be joined with its central axis misaligned with the central axis of the support pile 10, and is specifically referred to as a second grid point structure.

[0069] The intermediate lattice member 50b has vertical beam joints 52b and horizontal beam joints 53b to which the beam members 40 are connected. The vertical beam joints 52b extend in a first direction from the cylindrical body 51b, and the horizontal beam joints 53b extend in a second direction from the cylindrical body 51b. As with the girder member 41, the vertical beam joints 52b and horizontal beam joints 53b and the beam members 40 are connected by sandwiching the end of the vertical beam joints 52b or horizontal beam joints 53b and the end of the beam member 40 with splice plates 44, and fixing the end of each member to the splice plates 44 with bolts and nuts.

[0070] The intermediate batten member 50b is installed by dropping the cylindrical body 51b onto the pile head 12 of the support pile 10. Alternatively, the cylindrical body 51b may be divided, and the divided cylindrical bodies 51b may be butt-joined from the side of the support pile 10, and then installed by joining by welding or bolting.

[0071] The cylindrical body 51b of the intermediate grid point member 50b is a cylindrical body, and therefore has open ends in the upper and lower directions. Therefore, the upper end of the gap between the cylindrical body 51b and the support pile 10 becomes the filling port 56b, which is an opening for injecting the filler 80 into the space between the cylindrical body 51b and the support pile 10. The upper end of the gap between the cylindrical body 51b and the support pile 10 communicates with the outside and the space inside the cylindrical body 51a.

[0072] Before the filler material 80 is filled, a gap is formed between the inner surface of the cylindrical body 51b and the outer surface of the support pile 10, and the intermediate panel member 50b can move horizontally relative to the support pile 10 by the amount of this gap. In the case of the structure shown in Figure 8, there is no structure to support the intermediate panel member 50b in the vertical direction, so when attaching the intermediate panel member 50b to the support pile 10, a formwork jig 70 (see Figure 8) is abutted against the lower end surface of the intermediate panel member 50b to support the intermediate panel member 50b from below. The formwork jig 70 also has the function of preventing the filler material 80 from leaking out of the lower opening when it is filled.

[0073] The position of the pile head 12 of the support pile 10 may deviate from the expected position. If the amount of protrusion from the surface 94 of the ground 90 is large, a position error of the support pile 10 may occur even in the intermediate portions of the steel pipe column 20 and the steel pipe column 30.

[0074] As with the panel point structure 60a described above, the inner peripheral surface of the cylindrical body 51b and the outer surface of the support pile 10, which form the gap between the cylindrical body 51b filled with the filler material 80 and the support pile 10, are provided with ribs 54 and 13. Because the ribs 54 and 13 engage with the solidified filler material 80, the filler material 80 does not shift in the direction along the inner surface of the cylindrical body 51b and the outer surface of the support pile 10, and load transmission between the intermediate panel point member 50b and the support pile 10 can be improved.

[0075] 14, in the grid point structure 60c, the inner rib 54 and the outer rib 13 are arranged at different positions in the direction of the central axes C1 and C2. As a result, in the grid point structure 60c in the middle part of the support pile 10, as in the grid point structure 60a installed at the pile head 12, poor filling of the filler material 80 can be suppressed.

[0076] In the grid structure 60c, the inner rib 54 and the outer rib 13 may also be provided with cutouts 54a and 13a. As in the grid structure 60b, the inner rib 54 and the outer rib 13 may also be positioned in the direction of the central axes C1 and C2. In this case, the inner rib 54 and the outer rib 13 may also be provided with cutouts 54a and 13a (see FIG. 13).

[0077] (Modification of intermediate lattice member 50b) 15 is an explanatory diagram of the cross-sectional structure of a panel point structure 60d, which is a modified example of the panel point structure 60c according to Embodiment 1. The intermediate panel point member 150b can join, for example, the first steel pipe column 20a and the steel pipe column 30 by installing a support member 55b inside the cylindrical body 51b. The modified intermediate panel point member 150b is provided inside the cylindrical body 51b with a support member 55b having a structure similar to the support member 55a provided in the upper-end panel point member 50a.

[0078] The bottom surface of the support member 55b abuts against the end face 22a of the pile head 21a of the first steel pipe column 20a. The abutment between the bottom surface of the support member 55b and the end face 22a of the pile head 21a determines the position of the intermediate lattice point member 150b in the direction of the central axis of the support pile 10, i.e., its height. Before the filler material 80 is injected, a gap is formed between the inner surface of the cylindrical body 51b and the outer surface of the second steel pipe column 20b, allowing the intermediate lattice point member 150b to move horizontally relative to the second steel pipe column 20b by the amount of this gap. Like the support member 55a shown in Figure 7, the support member 55b is formed by combining plate-like members in a cross shape, but other configurations are also possible. The support member 55b may have any structure as long as it can hold the intermediate lattice point member 150b on the end face 14 of the pile head 12 and does not interfere with the injection of the filler material 80.

[0079] The end face 31 of the steel pipe column 30 is placed on the upper surface of the support member 55b. This is called the steel pipe column erection process. The steel pipe column erection process is included in the temporary joining process. When the upper surface of the support member 55b abuts against the end face 31 of the steel pipe column 30, the position of the steel pipe column 30 in the central axis direction of the support pile 10, i.e., the height direction, is determined. Before the filling material 80 is filled, a gap is formed between the inner surface of the cylindrical body 51b and the outer surface of the steel pipe column 30, and the steel pipe column 30 can be moved horizontally relative to the cylindrical body 51b by the amount of this gap. As described above, the intermediate panel point member 150b can join the first steel pipe column 20a, which is the lower member, and the steel pipe column 30, which is the upper member, with their central axes eccentric. The intermediate panel point member 150b includes the cylindrical body 51b and the support member 55a and joins the upper member and the lower member. The cylindrical body 51b and the support member 55a are particularly referred to as a second joint structure.

[0080] In the grid point structure 60d, an inner rib 54 is provided on the inner peripheral surface of the cylindrical body 51b, and outer ribs 13 are provided on the steel pipe columns 20a and 30. As in the grid point structure 60a, the inner rib 54 and the outer rib 13 are arranged so as to be offset in the directions of the central axes C1 and C2. Note that, in the grid point structure 60d, cutout portions 54a, 13a may also be provided in the inner rib 54 and the outer rib 13. Furthermore, as in the grid point structure 60b, the inner rib 54 and the outer rib 13 may be provided with cutout portions 54a, 13a and then be arranged so as to be aligned in the directions of the central axes C1 and C2.

[0081] As described above, in the grid structure 60d connecting the two steel pipe columns 20a and 30 in the middle part of the support pile 10, poor filling of the filler material 80 can be suppressed, just like in the grid structure 60a installed at the pile head 12.

[0082] The intermediate grid point member 150b is provided with a bolt 57 that is screwed into the cylindrical body 51b from the outside. The bolt 57 adjusts the position of the lower and upper members that make up the support pile 10 relative to the cylindrical body 51b and temporarily fixes them. The bolt 57 should be provided in a location where at least the inner rib 54 and the outer rib 13 are not located. In other words, the bolt 57 should be positioned offset in the direction of the central axes C1 and C2 relative to the inner rib 54 and the outer rib 13. Note that the head of the bolt 57 may be removed after the filler material 80 is filled inside the intermediate grid point member 50b and hardens. The temporary fixing bolt 57 shown in FIG. 15 can be applied to the grid point structure 60a, 60b, or 60c.

[0083] Embodiment 2 The grid point structure 260a according to the second embodiment is obtained by modifying the structures of the inner rib 54 and the outer rib 13 in comparison with the grid point structure 60a according to the first embodiment. The grid point structure 260a according to the second embodiment will be described mainly focusing on the changes made to the grid point structure 260a according to the first embodiment. In the drawings, parts of the grid point structure 260a according to the second embodiment that have the same functions are denoted by the same reference numerals as those used in the description of the first embodiment.

[0084] 16 is an explanatory diagram of the cross-sectional structure of a grid point structure 260a according to embodiment 2. The inner rib 254 of the grid point member 50a of the grid point structure 260a and the outer rib 213 of the pile head 12 are formed in a spiral shape. The inner rib 254 and the outer rib 213 are connected to one another, with one end of the rib being positioned offset in the direction of the central axes C1 and C2 from the other end.

[0085] The inner rib 254 and the outer rib 213 both have a spiral shape with the same number of turns per unit length in the directions of the central axes C1 and C2. The outer rib 213 is configured so that each circumferential portion about the central axis C2 does not coincide with each circumferential portion of the inner rib 254 in the directions of the central axes C1 and C2. In other words, when the cross-sectional structure of the grid structure 260 is viewed on a plane including the central axes C1 and C2, as shown in FIG. 16 , the outer rib 213 is positioned such that its cross-sectional position is shifted in the direction of the central axis C1 relative to the inner rib 254. In other words, the outer rib 213 is positioned with a phase shift in the rotational direction relative to the inner rib 254. This configuration allows each portion of the outer rib 213 along the spiral shape to be shifted in the directions of the central axes C1 and C2 relative to each portion of the inner rib 254 along the spiral shape. Therefore, even if the grid point member 50a is eccentric with respect to the pile head 12, it is possible to prevent the distance w between the outer rib 213 and the inner rib 254 from narrowing and creating a narrow portion.

[0086] Furthermore, even if the inner rib 254 and the outer rib 213 have a spiral shape with the same number of turns per unit length in the direction of the central axes C1, C2 and are in phase, each portion is inclined relative to the direction of the central axes C1, C2, i.e., the direction of gravity, so that air bubbles generated in the filler 80 move upward along the inclination and are easily discharged. Therefore, even if a narrow portion occurs in the grid structure 260a, incomplete filling of the filler 80 can be suppressed. Furthermore, even if a narrow portion occurs in the grid structure 260a, when the filler 80 is filled through the filling hole 56a, the filler 80 easily moves in the direction of gravity along the outer rib 213 or the inner rib 254, so incomplete filling can be suppressed.

[0087] As a modification of the grid structure 260a, a portion of the inner rib 254 or the outer rib 213 may be removed to provide the notches 54a and 13a. In other words, the inner rib 254 may be composed of multiple inner ribs 254 arranged on a virtual spiral line along the inner surface of the cylindrical body 51a. The outer rib 213 may be composed of multiple outer ribs 213 arranged on a virtual spiral line along the outer surface of the pile head 12. Because the inner ribs 254 and the outer ribs 213 are inclined relative to the central axes C1 and C2, any air bubbles generated in the filler 80 not only escape along the inclination but also escape through the notches 54a and 13a. This improves the ability to prevent improper filling of the filler 80. In this case, the inner ribs 254 and the outer ribs 213 may be in phase with each other around the central axes C1 and C2.

[0088] Furthermore, the outer rib 213 of the grid structure 260 a may have a spiral winding direction opposite to that of the inner rib 254 .

[0089] FIG. 17 is an explanatory diagram of the cross-sectional structure of a grid point structure 260a according to the second embodiment when the outer rib 213 is reverse-wound. FIG. 18 is a perspective view illustrating the positional relationship between the outer rib 213 and the inner rib 254 in FIG. 17. In FIG. 18, the pile head 12 and the cylindrical body 51a are depicted as simple cylinders. In this case, when the grid point structure 260a is viewed from the side, the outer rib 213 and the inner rib 254 intersect at one point per half turn, but do not otherwise overlap in the radial direction centered on C1 or C2. In the perspective view shown in FIG. 18, sections G and H indicate the overlapping portions of the outer rib 213 and the inner rib 254. In FIG. 18, the cylindrical body 51a and the pile head 12 of the grid point member 50a are eccentric, and the outer rib 213 and the inner rib 254 are close to each other at section G. However, avoiding eccentricity toward sections G and H can prevent narrow sections from occurring in the grid point structure 260a.

[0090] As described above, the grid structure 260a can promote the discharge of air bubbles generated in the filler 80 by slanting the inner rib 254 and the outer rib 213, and also suppresses the occurrence of narrow sections. Therefore, the grid structure 260a can suppress imperfect filling of the filler 80. The structure of the inner rib 254 and the outer rib 213 in the second embodiment can also be applied to the grid structures 60c and 60d in the middle of the support pile 10 described in the first embodiment.

[0091] Embodiment 3 The grid point structure 360a according to the second embodiment is obtained by modifying the structures of the inner rib 54 and the outer rib 13 in comparison with the grid point structure 60a according to the first embodiment. The grid point structure 360a according to the third embodiment will be described mainly focusing on the changes made to the grid point structure 360a according to the first embodiment. In the drawings, parts of the grid point structure 360a according to the third embodiment that have the same functions are denoted by the same reference numerals as in the drawings used to explain the first and second embodiments.

[0092] 19 is an explanatory diagram of the cross-sectional structure of a grid point structure 360a according to embodiment 3. The inner rib 354 of the grid point member 50a of the grid point structure 360a and the outer rib 313 of the pile head 12 are arranged such that one circumferential end is shifted in the direction of the central axis C1 relative to the other end. In other words, the outer rib 313 is inclined. For example, the pile head 12 may have multiple outer ribs 313 arranged at the same height. The multiple outer ribs 313 arranged at the same height of the pile head 12 may include ribs with different inclination directions.

[0093] The inner rib 354 of the grid point member 50a is also arranged so that one circumferential end is shifted toward the central axis C1 relative to the other end. In other words, the inner rib 354 is also inclined. The grid point member 50a has multiple inner ribs 354 arranged at the same height, and the multiple inner ribs 354 may include ribs with different inclination directions.

[0094] The inner ribs 354 and the outer ribs 313 may be offset in the direction of the central axes C1, C2 or may be arranged in overlapping positions. The number of inner ribs 354 and outer ribs 313 arranged can be changed appropriately in the direction of the central axes C1, C2 and in the circumferential direction.

[0095] A plurality of inner ribs 354 are provided in the circumferential direction, and adjacent inner ribs 354 have a space formed between their adjacent ends that communicates in the direction of the central axis C2. Similarly, adjacent outer ribs 313 have a space formed between their adjacent ends that communicates in the direction of the central axis C1. The formed space is desirably wide enough to allow the aggregate of the filler 80 to pass through or to allow air bubbles generated in the filler 80 to pass upward.

[0096] Furthermore, the ends of adjacent inner ribs 354 or adjacent outer ribs 313 are not necessarily positioned at the same height, and may be positioned, for example, offset in the direction of the central axes C1, C2. When the ends are positioned offset in the direction of the central axes C1, C2, even if the ends overlap in the direction of the central axes C1, C2, it is sufficient that a space large enough to allow the aggregate or air bubbles contained in the filler 80 to pass between them is provided.

[0097] As described above, in the grid structure 360a, the inner ribs 354 and the outer ribs 313 need not be spirally formed as long as one circumferential end is offset in the direction of the central axes C1 and C2 relative to the other end. Furthermore, the inner ribs 354 may be arranged at the same height in the direction of the central axis C2. In this case, the height positions of both circumferential ends of the inner ribs 354 do not need to be aligned. Furthermore, the inner ribs 354 and the outer ribs 313 may have different inclination angles. With this configuration, even if air bubbles are generated in the filler 80, the air bubbles escape from the end located above the direction of gravity, thereby preventing improper filling of the grid structure 360a. Furthermore, when the filler 80 is filled, the filler 80 easily descends along the inclined inner ribs 354 and outer ribs 313, thereby preventing improper filling.

[0098] Embodiment 4 The grid point structure 460a according to the fourth embodiment is obtained by changing the material that constitutes the support piles 10 or the grid point members 50a that constitute the grid point structure 260a according to the second embodiment. The grid point structure 360a according to the fourth embodiment will be described mainly focusing on the changes made to the grid point structure 360a according to the second embodiment.

[0099] Figure 20 is an explanatory diagram of the cross-sectional structure of a grid point structure 460a according to embodiment 4. Figure 21 is a cross-sectional view of a ribbed steel strip that constitutes a support pile 10 or a grid point member 50a according to embodiment 4. At least one of the support pile 10 and the cylindrical body 51a of the grid point member 50a that constitute the grid point structure 460a is made of a ribbed steel pipe manufactured by spirally forming a ribbed steel strip with ribs formed on its surface and welding the seams. This method of manufacturing ribbed steel pipe is also called spiral pipe manufacturing.

[0100] As shown in FIG. 21 , the cross-sectional shape of the ribbed steel strip has protrusions that become ribs 413 or 454 arranged at intervals of 40 mm to 50 mm, and the rib height H is set to 2.5 mm or more. The support pile 10 or the grid point member 50a is manufactured by spirally forming such a ribbed steel strip, resulting in multiple spiral ribs 413 or 454 at intervals of 40 mm to 50 mm. In other words, one circumferential end of each of the multiple ribs 413 and 454 is offset toward the central axis C1 or C2 relative to the other end. The cylindrical body 51a of the grid point member 50a is a steel pipe formed by spirally winding a ribbed steel strip having the cross-sectional shape shown in FIG. 21 around the central axis C2. The support pile 10 is a steel pipe formed by spirally winding a ribbed steel strip having the cross-sectional shape shown in FIG. 21 around the central axis C1.

[0101] In Figure 20, the solid line indicates the outer rib 413 of the pile head 12. Also, in Figure 20, the dashed line indicates the inner rib 454 of the tubular body 51a of the grid point member 50a. The spiral winding directions of the outer rib 413 and the inner rib 454 may be opposite to each other or may be the same. Because the outer rib 413 and the inner rib 454 are inclined toward the central axes C1 and C2, air bubbles generated in the filler material 80 do not accumulate but can be discharged upward. Furthermore, because the ribs 413 and the inner ribs 454 are attached to the steel pipe in advance and installed in large numbers with precision, misalignment between the filler material 80 and the support pile 10 and the grid point member 50a can be firmly prevented.

[0102] Furthermore, the support pile 10 and the grid point member 50a according to the fourth embodiment make it easier to manufacture a steel pipe with ribs than by adding ribs to a steel pipe later.

[0103] Although the present invention has been described above based on the embodiments, the present invention is not limited to the configurations of the above-described embodiments. In particular, the combinations of components are not limited to the combinations in the embodiments, and the combinations of components described in each embodiment can be modified as appropriate. We would like to emphasize that the gist (technical scope) of the present invention also includes various modifications, applications, and uses that those skilled in the art may make as needed. [Explanation of symbols]

[0104] 10 Support pile, 10a Support pile, 10b Support pile, 11 Joint, 12 Pile cap, 12a Outer surface, 13 Outer rib, 13a Notch, 14 End face, 20 Steel pipe column, 20a (1st) steel pipe column, 20b (2nd) steel pipe column, 21a Pile cap, 21b Pile cap, 22a End face, 30 Steel pipe column, 30b 2nd steel pipe column, 31 End face, 40 Beam member, 40a Longitudinal beam, 40b Cross beam, 41 Girder member, 41a Vertical girder, 41b Cross girder, 42 Floor slab fixing member, 43 Connecting part, 44 Splice plate, 50 (middle) case member, 50a (upper end) case member, 50b intermediate case member, 51a Cylindrical body, 51b Cylindrical body, 52a Stringer joint, 52b Stringer joint, 53a Stringer joint, 53b Stringer joint, 54 (inside) rib, 54a cutout, 55a support member, 55b support member, 56a filling hole, 56b filling hole, 57 bolt, 57a top surface, 58 upper plate, 60 lattice structure, 60a (top) lattice structure, 60b lattice structure, 60c lattice structure, 60d lattice structure, 70 formwork jig, 71 bracket, 73 fixing band, 74 formwork plate, 75 adjusting bolt, 76 nut member, 80 filling material, 81a aggregate, 81b aggregate, 90 ground, 92 sedimentary layer, 93 bearing layer, 94 surface, 99 road deck, 100 road structure, 150b intermediate lattice member, 160 Grid structure, 213 outer rib, 254 inner rib, 260 Grid structure, 260a Grid structure, 313 outer rib, 350a pile cap block, 354 inner rib, 360a Grid structure, 399 lining plate, 413 (outer) rib, 454 inner rib, 460a Grid structure, C central axis, C1 central axis, C2 central axis, F area, H height, P pitch, w distance.

Claims

1. A grid member filled with a filler material and fixed to a part of a steel pipe column, A cylindrical body surrounding the outer surface of the steel pipe column, The cylindrical body is A plurality of inner ribs protruding from the inner peripheral surface, Each of the plurality of inner ribs comprises: The longitudinal direction extends in the circumferential direction when viewed from the central axis direction, and the cylindrical body is inclined so that one end in the circumferential direction is shifted from the other end in the central axis direction of the cylindrical body, and bubbles are discharged along the inclination, A grid point member in which the adjacently arranged inner ribs are formed with spaces communicating in the central axis direction between their adjacent ends.

2. The plurality of inner ribs include: The grid point member according to claim 1 , wherein the grid point member is arranged spirally along the inner peripheral surface of the cylindrical body.

3. The plurality of inner ribs arranged at the same height in the central axis direction are 2. The grid point members according to claim 1, wherein the grid point members are inclined in different directions.

4. A steel pipe column erected on the ground and having a lattice member fixed to a part thereof, having an outer rib protruding from the outer surface; The outer rib is The longitudinal direction extends in the circumferential direction when viewed from the central axis direction, and the nozzle is disposed at an incline such that one end is shifted relative to the other end in the central axis direction, and bubbles are discharged along the incline, A steel pipe column, wherein the adjacently arranged outer ribs are formed with a space communicating in the central axis direction between their respective adjacent ends.

5. The outer rib is The steel pipe column according to claim 4 , wherein the outer surface is formed in a spiral shape along the outer surface.

6. The outer rib is 6. A steel pipe pole according to claim 4 or 5, comprising a plurality of external ribs.

7. The plurality of outer ribs arranged at the same height in the central axis direction are The steel pipe column according to claim 6, including columns having different inclination directions.

8. A grid structure formed by filling a filler material inside a grid member and fixing it to a steel pipe column, The grid members are A cylindrical body surrounding the outer surface of the steel pipe column, The cylindrical body is An inner rib protruding from the inner peripheral surface is provided, The steel pipe column is an outer rib protruding from the outer surface; Each of the inner rib and the outer rib is the longitudinal direction extends in the circumferential direction when viewed from the central axis direction, and one end in the direction along the circumferential direction is inclined so as to be shifted in the central axis direction of the steel pipe column relative to the other end, and bubbles are discharged along the inclination, A grid structure in which the adjacently arranged inner ribs and outer ribs are formed with a space communicating in the central axis direction between their adjacent ends.

9. The inner rib and the outer rib are 9. The grid structure according to claim 8, which is formed in a spiral shape.

10. The inner rib and the outer rib are 10. The grid structure according to claim 9, which is made up of a plurality of portions from which portions of the spiral have been partially removed.

11. The inner rib and the outer rib are 11. The grid structure according to claim 9, wherein the spirals have the same number of turns per unit length in the central axis direction, the same winding direction, and are arranged with a phase shift in the rotational direction.

12. The outer rib is 11. The grid structure according to claim 9 or 10, wherein the grid structure is disposed between two inner ribs aligned in the central axis direction.

13. The inner rib is a plurality of inner ribs; Some of the plurality of inner ribs 9. The grid structure according to claim 8, wherein the grid members are arranged at the same height in the axial direction.

14. The inner ribs arranged at the same height in the axial direction are The grid structure according to claim 13, including those having different inclination directions.

15. The outer rib is a plurality of outer ribs; A portion of the plurality of outer ribs 9. The grid structure according to claim 8, wherein the grid members are arranged at the same height in the axial direction.

16. The outer ribs arranged at the same height in the axial direction are The grid structure according to claim 15, including those having different inclination directions.

17. A grid structure formed by filling a filler material inside a grid member and fixing it to a steel pipe column, The grid members are A cylindrical body surrounding the outer surface of the steel pipe column, The cylindrical body is An inner rib protruding from the inner peripheral surface is provided, The steel pipe column is an outer rib protruding from the outer surface; Each of the inner rib and the outer rib is are arranged on the same circumference, The outer rib is The inner rib is disposed at an inclination at a position shifted in the central axis direction of the steel pipe column, and bubbles are discharged along the inclination, A grid structure in which the adjacently arranged inner ribs and outer ribs are formed with a space communicating in the central axis direction between their adjacent ends.

18. The grid members are A lattice structure according to any one of claims 8 to 13, comprising a support member inside the cylindrical body that abuts against the tip of the steel pipe column.

19. Further provided is a steel pipe pole placed on the support member, The grid members are The grid structure according to claim 18, wherein the support member is disposed at a central portion of the cylindrical body.

20. Multiple steel pipe pillars driven into the ground, A road structure comprising a grid structure according to any one of claims 8 to 19.

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