Installation structure and installation method for main steel material consisting of shaped steel and re-bar

Abstract

To simplify and stabilize installation of main steel materials consisting of shaped steel and re-bars, improve construction accuracy and save labor.SOLUTION: In an installation structure of main steel materials 2 in a concrete structure 1 with shaped steel 7 and re-bars 8 as the main steel materials 2, the shaped steel 7 and reinforcing bar 8 are unitized by a support member 10 to form a unit steel material M, and the main steel material 2 is constructed by sequentially connecting the unit steel materials M in the axial direction. The support member 10 is equipped with a fine adjustment mechanism 11 that can finely adjust the support position of the re-bars 8 relative to the shaped steel 7. With a mechanical joint 16, which connects re-bars 8 together in the axial direction, attached to the re-bars 8 on one side, a funnel-shaped guide member 17 is attached to the opening part of the mechanical joint 16 to guide the insertion of the re-bar 8 on the other side.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a structure and method for installing main steel members in a concrete structure in which the main axial steel members are hybrid structures made of shaped steel such as H-shaped steel and reinforcing bars such as deformed steel bars. [Background technology]

[0002] When constructing bridge piers for road bridges and the like from reinforced concrete, a known method involves arranging the axial main reinforcing bars, tie bars, intermediate tie bars, etc. at the installation site, setting up formwork around the periphery, and then pouring concrete inside, as disclosed in Patent Document 1 below, etc. However, when the axial main steel material is constructed only from steel bars, the number of axial main reinforcing bars increases, which has the disadvantage of increasing the amount of construction work and lengthening the construction period.

[0003] Furthermore, as disclosed in Patent Document 2 and other documents, a construction method using shaped steel such as H-shaped steel instead of axial main reinforcing bars is also known. However, when shaped steel is used solely as the main axial steel member, the cross-sectional area is small, which causes a drawback in that the cross-sectional stress is insufficient, and it is necessary to arrange a main steel member in parallel with the main steel members arranged in a row on the outer periphery of the structure, on the central side, which poses a problem in that the main steel member on the central side becomes useless in terms of stress function. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-115418 [Patent Document 2] Japanese Patent Application Publication No. 11-152899 Summary of the Invention [Problem to be solved by the invention]

[0005] A concrete structure that uses a hybrid structure of steel beams and reinforcing bars as the main axial steel material is known as a solution to these drawbacks. However, with such hybrid structures, the main steel material requires time and effort to install the steel beams and reinforcing bars, so there is a need for labor-saving measures and improved construction accuracy on site. Furthermore, when installing the reinforcing bars, only the bottom of the reinforcing bars can be fixed, and the top of the reinforcing bars cannot be fixed, which can lead to instability.

[0006] Therefore, the main object of the present invention is to provide a main steel material installation structure and installation method that allows the installation of main steel materials consisting of structural steel and reinforcing bars to be carried out simply and stably, and that aims to improve construction accuracy and reduce labor. [Means for solving the problem]

[0007] In order to solve the above problem, the present invention according to claim 1 provides a construction of a main steel member in a concrete structure whose main steel members are shaped steel and reinforcing bars, The structural steel and the reinforcing bar are unitized by a support member to form a unit steel material, There is provided a main steel member installation structure made of shaped steel and reinforcing bars, characterized in that the main steel member is constructed by sequentially connecting the unit steel members in the axial direction.

[0008] In the invention described in claim 1 above, a unit steel material is formed by unitizing a predetermined length of structural steel and reinforcing bars with support members, and the main steel material is constructed by sequentially connecting these unit steel materials in the axial direction.This makes it easy to install the main steel material, and it is possible to reduce the labor required for installation and improve construction accuracy compared to installing structural steel and reinforcing bars separately, and it is also possible to install the reinforcing bars stably with the structural steel supported by the structural steel.

[0009] As the present invention according to claim 2, there is provided a main steel material installation structure consisting of structural steel and reinforcing bars as described in claim 1, in which the support member is equipped with a fine adjustment mechanism that can finely adjust the support position of the reinforcing bars relative to the structural steel.

[0010] In the invention described in claim 2 above, the support member is equipped with a fine adjustment mechanism that can finely adjust the support position of the reinforcing bar, thereby improving construction accuracy when installing new reinforcing bars on existing reinforcing bars and reducing the labor required for installation work.

[0011] As the present invention according to claim 3, there is provided a main steel material installation structure consisting of structural steel and reinforcing bars as described in claim 2, which is composed of an external fitting member that fits loosely around the reinforcing bars, and a fine adjustment bolt that passes through the outer surface of this external fitting member and screws into the inner hollow portion, with its tip positioned in contact with the outer surface of the reinforcing bars.

[0012] The invention described in claim 3 above shows a specific structure of a fine adjustment mechanism that enables fine adjustment of the support position of a reinforcing bar relative to a shaped steel beam. The fine adjustment mechanism has a structure in which a fine adjustment bolt is threaded through an outer fitting member that fits the reinforcing bar loosely from the outer surface to the inner hollow portion, and the support position of the reinforcing bar can be finely adjusted by adjusting the tightening amount of this fine adjustment bolt.

[0013] As the present invention according to claim 4, there is provided a main steel member installation structure consisting of structural steel and reinforcing bars as described in claim 1, in which the support member is configured such that the reinforcing bars are fixed and supported to cross members fixed perpendicular to the structural steel.

[0014] In the invention described in claim 4, as a specific example of the support member, the reinforcing bars are fixedly supported via the fine adjustment mechanism to a cross member fixed perpendicular to the structural steel. By fixing and supporting any number of reinforcing bars at predetermined intervals to the cross member, the structural steel and one or more corresponding reinforcing bars are unitized to form the unit steel material.

[0015] The present invention as claimed in claim 5 provides a main steel material installation structure consisting of structural steel and reinforcing bars as described in claim 1, in which a mechanical joint that connects the reinforcing bars axially is attached to one of the reinforcing bars, and a funnel-shaped guide member is attached to the opening of the mechanical joint to guide the insertion of the other reinforcing bar.

[0016] In the invention described in claim 5 above, when a mechanical joint is used as a joint for axially connecting reinforcing bars, a funnel-shaped guide member is provided at the opening of this mechanical joint, which makes it possible to improve construction accuracy when installing reinforcing bars and reduce the labor required for installation work.

[0017] As the present invention according to claim 6, there is provided a main steel material installation structure consisting of structural steel and reinforcing bars as described in claim 5, in which the guide member is divided into multiple parts in the circumferential direction of the reinforcing bar, and the reinforcing bar can be removed after being inserted into the mechanical joint.

[0018] In the invention described in claim 6 above, the guide member has a structure in which it is divided into multiple parts in the circumferential direction of the reinforcing bar so that it can be removed and reused after the reinforcing bar is inserted into the mechanical joint.

[0019] The present invention as claimed in claim 7 provides a main steel member installation structure consisting of structural steel and reinforcing bars as described in claim 1, in which, when a splice plate that connects the structural steels to each other in the axial direction is attached to one of the structural steels, a separation width increasing portion is formed at the end of the protruding side of the splice plate, in which the separation width between the splice plates gradually increases toward the protruding side, to serve as a guide when inserting the other structural steel between the splice plates.

[0020] In the invention described in claim 7 above, when a splice plate is used as a joint when connecting structural steels in the axial direction, a separation width expansion section is formed at the end of the protruding side of this splice plate, which gradually increases the separation width between the splice plates toward the protruding side, making it easier to insert the other structural steel between the splice plates, improving construction accuracy when installing the structural steels together and reducing the labor required for installation work.

[0021] The present invention according to claim 8 provides a main steel member installation structure consisting of steel sections and reinforcing bars as described in claim 1, in which the steel sections are H-shaped steel sections with a predetermined pattern of protrusions on the outer surface of the flanges.

[0022] In the invention of claim 8, the structural steel is a checkered H-section steel having projections in a predetermined pattern on the outer surface of the flange, thereby increasing the bond strength between the structural steel and the concrete.

[0023] As a ninth aspect of the present invention, there is provided a method for erecting a main steel member erection structure made of shaped steel and reinforcing bars as set forth in claim 2, comprising: A method for erecting main steel materials consisting of structural steel and reinforcing bars is provided, characterized in that when lifting the unit steel materials to be erected, the fine adjustment mechanism is fixed and the reinforcing bars are fixed to the structural steel, when joining the unit steel materials, the fine adjustment mechanism is adjusted to adjust the position of the reinforcing bars, and after joining the unit steel materials, the fine adjustment mechanism is fixed and the reinforcing bars are fixed to the structural steel in the position at the time of joining.

[0024] In the invention described in claim 9 above, when lifting the unit steel material to erect it, the fine adjustment mechanism is fixed to integrate the reinforcing bar and the structural steel, and when joining the unit steel material, the fine adjustment mechanism is adjusted to adjust the support position of the reinforcing bar relative to the structural steel, and after joining the unit steel material, the fine adjustment mechanism is fixed to integrate the structural steel and the reinforcing bar in the position at the time of joining. [Effects of the Invention]

[0025] As explained above in detail, according to the present invention, the erection of main steel members consisting of shaped steel and reinforcing bars can be carried out simply and stably, thereby improving construction accuracy and reducing labor. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a cross-sectional view of a concrete structure 1. [Figure 2] FIG. 2 is a front view of unit steel material M. [Figure 3] FIG. 3 is a view taken along the line III-III in FIG. 2. [Figure 4] FIG. [Figure 5] FIG. 10 is a front view of a unit steel material M according to a modified example. [Figure 6] FIG. 6 is a view taken along the line VI-VI in FIG. 5. [Figure 7] This is a modified example of the fine adjustment mechanism 11. [Figure 8] FIG. 2 is a front view showing how to install unit steel material M. [Figure 9] 10 is a perspective view showing how to attach a guide member 17 to a mechanical joint 16. FIG. [Figure 10] FIG. 2 is a cross-sectional view showing the connection structure of structural steel 7. [Figure 11] FIG. 10 is a cross-sectional view showing a modified example of the splice plate. [Figure 12] FIG. 10 is a cross-sectional view showing a support member 10' according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0028] (Main steel frame construction) The concrete structure 1 to which the main steel member erection structure of the present invention is applicable includes not only column structures such as the bridge pier structure shown in Figure 1, but also all types of steel-concrete composite concrete structures consisting of main steel members 2 and concrete 3 surrounding the main steel members 2, such as retaining wall structures, revetment structures, and quay structures.

[0029] As shown in FIG. 1, the concrete structure 1 is mainly composed of main steel members 2 erected in the vertical direction and concrete 3 surrounding the main steel members 2. The concrete structure 1 in the illustrated example is provided with a plurality of embedded formworks 4 made of precast concrete that form the outer shell of the structure, and the concrete 3 is filled inside the embedded formworks 4 by being poured in place. Note that instead of such embedded formworks 4, ordinary formwork may be used, in which the concrete 3 poured into the formwork is removed after hardening. Furthermore, as in the illustrated example, tie bars 5 and intermediate tie bars 6 may be arranged to surround the periphery of one or more main steel members 2.

[0030] In the erection structure of the present invention, as shown in Figures 2 and 3, a predetermined length of structural steel 7 and reinforcing bars 8 are unitized by support members 10 to form unit steel material M, and the main steel material 2 is constructed by sequentially connecting these unit steel materials M in the axial direction.

[0031] The unit steel material M is constructed by connecting a predetermined length of shaped steel 7 and reinforcing bars 8 with support members 10. In other words, one or more reinforcing bars 8 are set up in parallel to one shaped steel 7 in the vertical direction. The number of reinforcing bars 8 set up with the shaped steel 7 may be constant or may vary throughout the concrete structure 1. As for the arrangement of the shaped steel 7 and the reinforcing bars 8, it is preferable that the reinforcing bars 8 are placed on the outside of the shaped steel 7 as in the illustrated example, but conversely, the reinforcing bars 8 may be placed on the inside of the shaped steel 7, or the shaped steel 7 and the reinforcing bars 8 may be placed in parallel.

[0032] As shown in Fig. 3, H-shaped steel beams with an H-shaped cross section can be used as the shaped steel 7. In addition, T-shaped steel beams, I-shaped steel beams, channel steel beams, C-shaped steel beams, etc. may also be used. In particular, as shown in Fig. 4, it is desirable to use, as the shaped steel 7, striped H-shaped steel beams having protrusions 9 in a predetermined pattern on the outer surface of the flange 7A.

[0033] The checkered H-beam is primarily used as a road lining plate, and has a plurality of anti-slip protrusions 9, 9... formed on the outer surface of the flange 7A by hot rolling. No such protrusions are provided on the inner surface of the flange 7A or on both surfaces of the web 7B other than the outer surface of the flange 7A, and the surfaces are flat. The height of the protrusions 9 varies depending on the type of checkered H-beam, but is usually 1 to 5 mm, and it is preferable to use ones with a height of 2 to 3 mm.

[0034] The protrusions 9 are formed over the entire outer surface of the flange 7A, i.e., across the entire width and axial length of the outer surface of the flange 7A. The protrusions 9 can be formed in a variety of patterns depending on the type of checkered H-shaped steel. Any pattern may be used, but a grid-like pattern extending along the axial and width directions of the checkered H-shaped steel is preferable, as shown in FIG. 4 . The grid-like pattern of the protrusions 9 is defined by a plurality of protrusions 9, each consisting of ridges extending linearly along the axial and width directions of the checkered H-shaped steel, arranged at predetermined intervals in the width and axial directions. The use of a grid-like pattern of the protrusions 9 provides stronger adhesion to the concrete 3 against shear forces acting in the axial and width directions of the checkered H-shaped steel, further improving adhesion performance with the concrete 3. The grid-like protrusions 9 result in the formation of multiple rectangular island-shaped recesses 9a in areas other than the protrusions 9.

[0035] As the reinforcing bar 8, any known reinforcing bar can be used without limitation, such as a deformed steel bar with protrusions called ribs or knots on the surface, a threaded reinforcing bar with screw-like protrusions on the surface, or a round bar with no protrusions. The size of the reinforcing bar 8 can be selected according to the load to be received, and for example, sizes D22 to D51 can be used.

[0036] The steel sections 7 and the reinforcing bars 8 are arranged with a predetermined separation distance (gap) between them. This separation distance is the largest of 1.5 times the diameter of the reinforcing bars 8, 1.25 times the maximum dimension of the coarse aggregate, and 25 mm. For example, if the nominal diameter of the reinforcing bars 8 is D51, a gap of at least 77 mm, which is 1.5 times the diameter of the reinforcing bars 8 (51 mm), is provided. Therefore, each member of the support member 10 is configured with dimensions that ensure this separation distance.

[0037] In the embodiment shown in FIGS. 2 and 3, the support member 10 is configured such that a reinforcing bar 8 is fixed and supported by a cross member 12 fixed perpendicular to the structural steel 7 with a U-bolt 25. The cross member 12 is a steel material such as a channel steel, H-shaped steel, I-shaped steel, or C-shaped steel that extends in a direction perpendicular to the structural steel 7 (horizontal direction), and is fixed by being clamped by a clamp 13 or the like to one flange 7A of the structural steel 7. The cross member 12 is fixed to the structural steel 7 by the tightening force of the clamp 13, but to more reliably prevent misalignment in the shear direction between the structural steel 7 and the cross member 12, a protrusion corresponding to the recess 9a formed on the outer surface of the flange 7A of the H-shaped steel may be provided on the abutting surface of the cross member 12 that abuts against the structural steel 7.

[0038] One or more reinforcing bars 8 extending in a direction perpendicular to the axial direction of the cross member 12 are fixed and supported on the cross member 12 at predetermined intervals along the axial direction (horizontal direction) of the cross member 12. When multiple reinforcing bars 8 are fixed, a separation distance is set taking into account the gap between the reinforcing bars. Furthermore, the reinforcing bars 8 are preferably arranged outside the flange width of the shaped steel 7. This allows the reinforcing bars 8 to be arranged without getting in the way when installing splice plates that join the shaped steels 7, facilitating smooth construction work. When an odd number of reinforcing bars 8 are arranged, it is preferable to arrange the reinforcing bars 8 symmetrically with respect to the central axis of the shaped steel 7, so that the reinforcing bars 8 are arranged on the central axis of the shaped steel 7. In this case, the splice plates are arranged so as to be inserted from the side into the gap between the shaped steel 7 and the reinforcing bars 8.

[0039] In the embodiment shown in FIGS. 5 and 6, the support member 10 is provided with a fine adjustment mechanism 11 that can finely adjust the support position of the reinforcing bar 8 relative to the shaped steel 7.

[0040] As shown in Figures 5 and 6, the fine adjustment mechanism 11 is composed of an outer fitting member 14 that fits loosely around the reinforcing bar 8, and a fine adjustment bolt 15 that passes through the outer surface of the outer fitting member 14 and into the inner hollow portion, and whose tip is positioned so that it abuts against the outer surface of the reinforcing bar 8.

[0041] Legs 14a, 14a extend from both sides of the outer fitting member 14 for fixing to the cross member 12, and the fine adjustment mechanism 11 is fixed to the cross member 12 by fixing the legs 14a to the cross member 12 with nuts.

[0042] As shown in Fig. 6, the fine adjustment bolts 15 are arranged at predetermined intervals in the circumferential direction so as to press and support the reinforcing bar 8 from at least three sides, and are arranged toward the center of the outer fitting member 14. In the example shown in Fig. 6, one bolt is provided on each side parallel to the axial direction of the cross member 12, and one bolt is provided in a direction perpendicular to this, and the reinforcing bar 8 can be finely adjusted left and right by threading the fine adjustment bolts 15, 15 on both sides back and forth.

[0043] The fine adjustment bolts 15 may be arranged in three directions spaced apart by approximately 120° as shown in Fig. 7(A), or in four directions spaced apart by approximately 90° as shown in Fig. 7(B), which allows adjustment of the position in all directions in the plane perpendicular to the axial direction of the reinforcing bar 8.

[0044] The difference between the inner diameter of the outer fitting member 14 and the outer diameter of the reinforcing bar 8 is preferably about 1 to 20 mm.

[0045] As shown in Figure 8, the unit steel material M, in which the structural steel 7 and the reinforcing bar 8 are unitized by the support member 10, is installed on top of the existing unit steel material M by suspending the newly installed unit steel material M using a lifting machine such as a crane.

[0046] In the erection structure of the present invention, a mechanical joint 16 that connects the reinforcing bars 8, 8 axially is attached to one of the reinforcing bars 8, and a funnel-shaped guide member 17 is attached to the opening at the edge of the mechanical joint 16 to guide the insertion of the other reinforcing bar 8.

[0047] The guide member 17 is a member formed by pressing a thin metal plate or the like, and as shown in Figure 9, is a cylindrical member with open upper and lower ends, consisting of a straight tubular insertion portion 18 that is inserted into the opening of the mechanical joint 16, and a tapered expanded diameter portion 19 that gradually expands in diameter from one end of the insertion portion 18 in the protruding direction.

[0048] The diameter of the edge opening of the enlarged diameter portion 19 is preferably about 1.2 to 3 times the diameter of the opening of the mechanical joint 16 so that the reinforcing bar 8 can be easily inserted. The taper of the enlarged diameter portion 19 is preferably about 1:1.5 to 1:5. This allows the reinforcing bar 8 to be smoothly inserted into the opening of the mechanical joint 16 while being guided by the guide member 17, making it easy to install the unit steel material M.

[0049] The guide member 17 is divided into multiple parts in the circumferential direction of the reinforcing bar 8, preferably into two parts as shown in the illustrated example, so that it can be removed after the reinforcing bar 8 is inserted into the mechanical joint 16. In addition, at least the insertion portion 18 is formed with a thickness that allows it to be inserted into the gap between the reinforcing bar 8 and the mechanical joint 16.

[0050] In the structural steel 7 and the reinforcing bars 8 connected thereto, the axial connection portions between the structural steels 8 and the axial connection portions between the structural steels 7 may be located at the same height, but as shown in Figure 8, it is preferable to locate them at different heights, as this will allow weak parts at each axial connection portion to be dispersed rather than concentrated. Also, for the same reason, when multiple reinforcing bars 8 are provided in one unit steel material M, it is preferable to locate the axial connection portions of each reinforcing bar 8 at different heights.

[0051] As the mechanical joint 16, any known joint can be used without any restrictions, and examples thereof include a mortar-filled joint in which non-shrinkage mortar is filled between the reinforcing bar 8 and the mechanical joint 16 to fix them, and a screw-mortar combined joint in which a threaded reinforcing bar is used as the reinforcing bar 8, and one reinforcing bar 8 is fastened with a screw, and the other reinforcing bar 8 is fixed by filling non-shrinkage mortar.

[0052] In the embodiment shown in Figure 8, the mechanical joint 16 is installed in advance at the upper end of the reinforcing bar 8 of the existing unit steel material M, and a funnel-shaped guide member 17 is attached to the upper end opening of the mechanical joint 16 facing upward. However, the mechanical joint 16 may also be installed at the lower end of the reinforcing bar 8 of a newly installed unit steel material M, and a funnel-shaped guide member 17 may be attached to the lower end opening of the mechanical joint 16 facing downward.

[0053] As shown in Fig. 10, a splice plate can be used as the axial connection joint for the shaped steel 7. In the joining structure using the splice plate, a flange outer surface side splice plate 20 and a flange inner surface side splice plate 21 are fastened together with a plurality of bolts 22 to the outer surface and inner surface, respectively, of the flange 7A that straddles the joining end of the shaped steel 7, and web splice plates 23 are fastened together with a plurality of bolts 24 to both side surfaces of the web 7B that straddles the joining end of the shaped steel 7.

[0054] By connecting the structural steels 7, 7 together in the axial direction, the structural steels 7 can stand upright in the vertical direction, and therefore the reinforcing bars 8 supported on the structural steels 7 by the support members 10 can also stand upright in the vertical direction, allowing the reinforcing bars 8 to be installed stably.

[0055] As shown in Figure 11, when a splice plate that connects the sectional steels 7, 7 axially is attached to one of the sectional steels 7, it is preferable to form a spacing width increasing portion 26 at the protruding end of the splice plate, in which the spacing width between the splice plates gradually increases toward the protruding side, to serve as a guide when inserting the other sectional steel 7 between the splice plates. By providing the spacing width increasing portion 26 at the protruding end of the splice plate, a spacing portion with a Y-shaped cross section is formed between the splice plates, making it easier to insert the sectional steel 7 between the splice plates, improving construction accuracy during installation and reducing the labor required for installation. The spacing width increasing portion 26 is located outside the area where the splice plates are fastened together with bolts in the protruding direction.

[0056] Figure 11 shows an example of the web attachment plates 23, 23 attached to both sides of the web 7B, with the spacing between these attachment plates 23, 23 gradually increasing toward the protruding side. Similarly, the flange outer surface side attachment plate 20 and the flange inner surface side attachment plate 21 attached to the outer and inner surfaces of the flange 7A also have a spacing width increasing portion 26 formed therein, in which the spacing between the attachment plates 20, 21 gradually increases toward the protruding side.

[0057] Furthermore, Figure 11 illustrates a configuration in which the splice plate is installed in advance in a state in which it protrudes upward from the upper end of the structural steel 7 of the existing unit steel material M, and the separation width expansion portion 26 is formed at the upper end of the splice plate, but it is also possible to install the splice plate in advance in a state in which it protrudes downward from the lower end of the structural steel 7 of the newly installed unit steel material M, and the separation width expansion portion 26 is formed at the lower end of the splice plate.

[0058] The above-mentioned embodiment in which a funnel-shaped guide member 17 is attached to the opening of the mechanical joint 16 to guide the insertion of the reinforcing bar 8 into the mechanical joint 16, and the embodiment in which a separation width expansion portion 26 is formed at the protruding end of the splice plate to guide the insertion of the structural steel 7 between the splice plates, may be provided simultaneously, or only one of them may be provided.

[0059] (Main steel construction method) Next, we will explain the method of erecting the unit steel material M. The structural steel 7 and reinforcing bars 8 that make up the unit steel material M are each formed to a length suitable for erection (for example, about 10 m), and are connected to each other by support members 10 arranged at predetermined intervals in the axial direction, while ensuring a predetermined separation distance between them.

[0060] Also, as shown in Figure 8, a mechanical joint 16 is attached to the upper end of the existing reinforcing bar 8 in advance, and a funnel-shaped guide member 17 is inserted into the upper end opening of this mechanical joint 16.

[0061] The unit steel material M consisting of the structural steel 7 and the reinforcing bars 8 connected by the support members 10 is suspended by a lifting machine such as a crane and erected on top of the existing unit steel material M, as shown in FIG.

[0062] When lifting the newly installed unit steel material M, the fine adjustment mechanism 11 provided on the support member 10 is fixed to fix the reinforcing bar 8 to the structural steel 7. This prevents the reinforcing bar 8 from falling off, and allows the unit steel material M to be installed stably.

[0063] When the unit steel material M is installed, first, the lower end of the new reinforcing bar 8 is guided by the guide member 17 attached to the upper end of the existing reinforcing bar 8 and inserted into the interior of the mechanical joint 16 from the upper end opening. Once the reinforcing bar 8 has been inserted into the mechanical joint 16, the guide member 17 is removed. If the splice plates connecting the structural steels 7, 7 are provided with the aforementioned separation width enlarged portions 26, the new structural steel 7 is guided by the separation width enlarged portions 26 and inserted between the splice plates.

[0064] Next, the fixed state of the reinforcing bar 8 by the fine adjustment mechanism 11 is released, and the structural steel 7 is connected in the axial direction by the splice plates 20, 21, and 23. At this time, since the fixed state of the structural steel 7 and the reinforcing bar 8 has been released, the position of the structural steel 7 can be finely adjusted independently of the reinforcing bar 8, and only the structural steel 7 can stand on its own in the vertical direction.

[0065] Once the axial connection of the structural steel 7 with the splice plate is complete, the fine adjustment mechanism 11 is operated to set the reinforcing bar 8 upright in the vertical direction. In this way, when joining the unit steel material M, the fine adjustment mechanism 11 is adjusted to adjust the position of the reinforcing bar 8.

[0066] Thereafter, filler is injected into the mechanical joint 16 to join the reinforcing bar 8 in the axial direction, completing the joining of the unit steel material M. After joining the unit steel material M, the fine adjustment mechanism 11 is fixed, and the reinforcing bar 8 is fixed to the structural steel 7 at the position at the time of joining.

[0067] As described above, the main steel material 2 is formed by sequentially connecting the unit steel materials M in the axial direction.

[0068] (Variation) In the above embodiment, the support member 10 has a structure in which the reinforcing bar 8 is fixed via a fine adjustment mechanism 11 to a cross member 12 fixed perpendicular to the structural steel 7, but as shown in Fig. 12, the support member 10' may have a structure in which the reinforcing bar 8 is fixed via a fine adjustment mechanism 11 to the tip of a support rod 30 fixed to the structural steel 7. A clamp 31 capable of clamping the end of the flange 7A side of the structural steel 7 is fixed to the end of the support rod 30 on the structural steel 7 side, and an outer fitting member 14 of the fine adjustment mechanism 11 is fixed to the other end of the support rod 30.

[0069] The support rods 30 are made of rod material, strip material, plate material, etc., and are formed to a predetermined length so that the reinforcing bars 8 are arranged at a predetermined distance from the structural steel 7. Furthermore, the support rods 30 may be configured so that one reinforcing bar 8 is arranged per support rod 30, or may be branched midway so that multiple reinforcing bars 8 are arranged per support rod 30. [Explanation of symbols]

[0070] 1...concrete structure, 2...main steel material, 3...concrete, 4...buried formwork, 5...hoop reinforcing bar, 6...intermediate hoop reinforcing bar, 7...shaped steel, 8...reinforcing bar, 9...projection, 10...support member, 11...fine adjustment mechanism, 12...cross member, 13...clamp, 14...external fitting member, 15...fine adjustment bolt, 16...mechanical joint, 17...guide member, 18...insertion portion, 19...expansion portion, 20...flange outer surface side splice plate, 21...flange inner surface side splice plate, 22...bolt, 23...web splice plate, 24...bolt, 25...U-bolt, 26...separation width expansion portion

Claims

1. A concrete structure in which structural steel and reinforcing bars are used as main steel materials, The structural steel and the reinforcing bar are unitized by a support member to form a unit steel material, A main steel member erection structure made of shaped steel and reinforcing bars, characterized in that the main steel member is constructed by sequentially connecting the unit steel members in the axial direction.

2. 2. A main steel member installation structure comprising shaped steel and reinforcing bars according to claim 1, wherein the support member is provided with a fine adjustment mechanism that can finely adjust the support position of the reinforcing bars relative to the shaped steel.

3. The fine adjustment mechanism is composed of an outer fitting member that fits loosely around the reinforcing bar, and a fine adjustment bolt that penetrates from the outer surface of the outer fitting member into the inner hollow portion and is screwed into the outer surface of the reinforcing bar, with its tip positioned in contact with the outer surface of the reinforcing bar.

4. 2. A main steel member erection structure comprising structural steel and reinforcing bars as described in claim 1, wherein the support member is configured such that the reinforcing bars are fixed and supported by cross members fixed perpendicular to the structural steel.

5. A main steel material installation structure consisting of structural steel and steel bars as described in claim 1, wherein a mechanical joint that connects the steel bars axially is attached to one of the steel bars, and a funnel-shaped guide member is attached to the opening of the mechanical joint to guide the insertion of the other steel bar.

6. A main steel material installation structure consisting of structural steel and reinforcing bars as described in claim 5, wherein the guide member is divided into multiple parts in the circumferential direction of the reinforcing bars, and can be removed after the reinforcing bars are inserted into the mechanical joint.

7. 2. A main steel member installation structure consisting of structural steel and reinforcing bars as described in claim 1, wherein, when a splice plate that connects the structural steels axially is attached to one of the structural steels, a spacing width increasing portion is formed at the end of the protruding side of the splice plate in order to guide the insertion of the other structural steel between the splice plates, so that the spacing width between the splice plates gradually increases toward the protruding side.

8. 2. A main steel member erection structure comprising steel sections and reinforcing bars according to claim 1, wherein the steel sections are H-section steels having a predetermined pattern of protrusions on the outer surfaces of the flanges.

9. A method for erecting a main steel structure made of shaped steel and reinforcing bars according to claim 2, A method for erecting main steel materials consisting of structural steel and reinforcing bars, characterized in that when lifting the unit steel materials to be erected, the fine adjustment mechanism is fixed and the reinforcing bars are fixed to the structural steel, when joining the unit steel materials, the fine adjustment mechanism is adjusted to adjust the position of the reinforcing bars, and after joining the unit steel materials, the fine adjustment mechanism is fixed and the reinforcing bars are fixed to the structural steel in the position at the time of joining.

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