JP2944448B2 - Steel plate concrete composite structure unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel-concrete composite structural unit constituting a structure such as an offshore structure, a bottomed caisson or a breakwater.

[0002]

2. Description of the Related Art FIG. 14 shows a conventional pontoon used for an offshore structure, a bottomed caisson or a breakwater. When the pontoon 40 is manufactured, a box-shaped steel plate 43 serving as a frame of the entire product is manufactured by first welding a watertight bulkhead 41 and a vertical bulkhead 42 inside the dock.
A reinforcing bar 44 and a dowel (stud) 45 are welded to the outside of the steel plate 43. Then, a formwork (not shown) is arranged around the steel plate 43, and concrete 46 is poured around the steel plate 43, and the concrete 46 is hardened. The mold is later removed.

[0003]

The above-mentioned conventional manufacturing operation is a large-scale operation for manufacturing the steel plate 43 to be the frame of the entire product. The assembling of the steel plate 43, installation of the formwork, placing of the concrete 46, and curing of the concrete 46 are all performed in the dock. For this reason, there is a problem that the work for manufacturing the structure is difficult, requires a lot of labor and manufacturing days, and therefore the dock occupation period is lengthened and the manufacturing cost is high.

Accordingly, an object of the present invention is to provide a steel-concrete composite structural unit capable of solving the above-mentioned problems.

[0005]

Means for solving the problem of the present invention is a structural unit constituting an outer shell of a structure, which is used for welding an end of a steel plate to another structural unit. The mounting body is provided with a joining portion whose base end is joined to a steel plate, and a bent portion bent substantially parallel to the steel plate surface from the tip of the joining portion, and has a cross section L Concrete is cast on the side of the steel plate on which the mounting body is provided, and the opposite side of the bent portion to the steel plate is joined to a mounting body provided on another structural unit. And a joint space for casting joint concrete after welding.

A structural unit constituting an outer shell of a structure, comprising: a steel plate; and a frame-shaped mounting member provided on one side surface of the steel plate and smaller than the steel plate. The periphery of the attachment is a projecting portion, and the mounting body has a joint portion whose base end is joined to the steel plate, and the reinforcing member is bent substantially parallel to the steel plate surface from the tip end of the joining portion to mount the reinforcing bar. Concrete is cast on one side where the mounting body on the steel plate is arranged, and the periphery of the overhang is a joining side with the periphery of the overhang of another structural unit. In addition, on one side of the overhanging portion, a joining concrete placing portion is provided for placing the joining concrete after welding the overhanging portions.

[0007]

In the above construction, the joint of the mounting member to be welded to another structural unit is welded to the end of the steel plate, and concrete is cast on both sides of the steel plate on the side where the mounting member is provided. In the work space provided on the opposite side of the steel plate from the bent part of the mounting body, welding work with the mounting body welded to other structural units is performed, and after welding, the work space part also serves as the joint concrete casting part The outer shell of the structure is assembled by casting joint concrete.

[0008] Further, the joint portion of the mounting member is welded on the steel plate, and concrete is cast on the side of the steel plate on which the mounting member is provided, to form a structural unit, and the overhang portions of the steel plate are welded to each other. At the same time, the reinforcing bars supported by the bent portions are welded to each other, and the joining concrete is poured into the joining concrete placing portion of the overhang portion to assemble the outer shell of the structure.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described with reference to the drawings. This is a structural unit constituting an outer shell portion of a marine structure or the like,
As shown in the overall configuration diagram of FIG. 1 and the exploded view of FIG. 2, an upper deck unit 1 serving as an upper deck portion of the marine structure, a side wall unit 2 serving as a side wall portion, and front and rear walls serving as front and rear wall portions. Unit 3 and corner unit 4 as a corner
And a steel plate 5 as a bottom plate portion.

As shown in the unit configuration diagram of FIG. 3, the upper deck unit 1 has a rectangular steel plate 6 formed to a predetermined size, and another steel plate 6 fixed to the four side edges of one side of the steel plate 6. A mounting body 7 to be joined to a structural unit;
A predetermined number of dowels 13 welded to a predetermined position on one side surface, and a rebar 1 in a different direction fixed to the mounting body 7
0, 11 and concrete 14 cast on one side of the steel plate 6.

The base of the mounting member 7 is the steel plate 6.
And a bent portion 9 which is bent upright from one end of the steel plate 6 substantially parallel to one side surface of the steel plate 6 and has an L-shaped cross section. The reinforcing bars 10 arranged in one direction at a predetermined pitch are laid horizontally on the pair of bent portions 9 and the ends thereof are welded, and the reinforcing bars 11 in another direction perpendicular to the reinforcing bars 10 are formed. A plate 12 having a thickness equal to the diameter of the reinforcing bar 10 in one direction in another pair of bent portions 9.
Is placed via.

As shown in the enlarged sectional view of the end portion of FIG. 4, the concrete 14 has a portion cast in a space surrounded by the joint 8 of the mounting member 7 and a bent portion of the mounting member 7. 9 and a portion protruding from the opening surrounded by the opening 9, and has a T-shaped cross section. Therefore, one side (the side opposite to the steel plate) of the bent portion 9 is exposed without being embedded in the concrete 14. The ends of the reinforcing bar 10 in one direction and the reinforcing bar 11 in the other direction are exposed on one side surface of the bent portion 9.

As shown by phantom lines in FIG. 3, angles 10A, 10A for welding intermediate portions of the reinforcing bars 10, 11 according to the size of the upper slab unit 1 (length of the reinforcing bars 10, 11). 11A is arranged at any time.

FIG. 5 is a front sectional view and FIG. 6 is a plan sectional view showing the configuration of the side wall unit 2 and the front and rear wall units 3. This has the same configuration as the upper floor slab unit 1, and has a rectangular steel plate 6 formed in a predetermined size,
A mounting body 7 welded to four side edges of one side of the steel plate 6,
One-way reinforcing bar 10 welded to the bent portion 9 of the mounting body 7
And a reinforcing bar 11 welded to the bent portion 9 of the attachment body 7 via a plate 12, a dowel 13 fixed to one side of the steel plate 6, and a space surrounded by the joint 8. The concrete 14 is composed of a portion provided and a portion protruding from an opening surrounded by the bent portion 9.

As shown in FIG. 2, the corner unit 4 includes a first corner unit 4A disposed at a corner between the upper slab unit 1 and the front and rear wall units 3.
A second corner unit 4B disposed at a corner between the upper floor slab unit 1 and the side wall unit 2, and a third corner unit disposed at a corner between the front and rear wall units 3 and the side wall unit 2. And a corner unit 4C.

Since the first corner unit 4A and the second corner unit 4B have the same configuration, the configuration of the first corner unit 4A will be described. As shown in FIG. 5 and FIG. 6, as shown in FIG. 5 and FIG. 6, a steel plate 15 having an L-shaped cross section along a corner, a mounting body 16 welded along four side edges of one side of the steel plate 15, A concrete 18 comprising a dowel 19 welded at a predetermined position and a portion filled in a space surrounded by the joint 16a of the mounting body 16 and projecting from an opening surrounded by the bent portion 17; An L-shaped one-way reinforcing bar 20 laid on a pair of bent portions 17 of the mounting body 16 and welded to its ends, and laid on another pair of bent portions 17 Straight reinforcing bars 2 with different ends welded to each other
And 1.

The configuration of the second corner unit 4B is the same as the configuration of the above-described first corner unit 4A, and thus the description thereof will be omitted. The third corner unit 4C
As shown in FIGS. 1, 2 and 6, a steel plate 15 having an L-shaped cross section along a corner portion, an attachment body 16 welded along four side edges of one side surface of the steel plate 15, A dowel 19 welded to a predetermined position of the steel plate 15, a concrete 18 cast on the steel plate 15, and an L which is horizontally laid on a pair of bent portions 17 of the mounting body 16 and whose ends are welded thereto.
The concrete 18 comprises a one-way reinforcing bar 20 in the shape of a letter, and a linear reinforcing bar 21 in a different direction, which is laid on the other pair of bent portions 17 and welded at its ends. The space surrounded by the joint 16a of the mounting body 16 is filled and protrudes from the opening surrounded by the bent portion 17. The other side (back side) of the steel plate 15 has a prismatic shape. Concrete 18a is cast.

Next, a method for assembling the units 1, 2, 3, and 4 configured as described above, and the units 1 and 2,
The method of assembling the marine structure will be described with reference to 2, 3, and 4. In addition, since the assembling method of each unit 1, 2, 3, 4 is the same, if it demonstrates in the upper floor slab unit 1, first, the joining part 8 of the attachment body 7 will be welded to the four side edges of one side of the steel plate 6,
The dowel 13 is welded to the plate surface of the steel plate 6, the plate 12 is welded to the bent portion 9 of the attachment body 7, and the rebar 1 in one direction is welded.
0 and another direction of the reinforcing bar 11 are welded, a form (not shown) is erected on the bent portion 9 of the mounting body 7, concrete 14 is poured, and after the concrete 14 is hardened, the form is removed and the upper floor slab unit 1 is removed. To complete.

Each of the units 1 and 2 thus assembled
The method of assembling the offshore structure by joining 2, 3, and 4 is as follows. That is, for example, the upper floor unit 1 and the first corner unit 4A are joined together as shown in FIGS.
A, joining the joints 8 of the mounting members 7
Apply the contact plate 22 to the joint on the other side (back side) of
Next, the worker performs welding work between the attachment bodies 7 in the work space portion 23 on the opposite side of the steel plate of the bent portion 9 to join the upper floor slab unit 1 and the first corner unit 4A. At the place where the plate 12 is provided in the bent portion 9, the plates 12 are welded to each other.

Then, the joint concrete 25 is cast into the joint concrete placing section 24 which is the work space section 23 on the opposite side of the steel plate, and the joining operation is completed. FIG. 9 shows a joint between the front and rear wall unit 3, the third corner unit 4C, and the side wall unit 2 of the structural unit with respect to the steel plate 5 constituting the marine structure. For example, the front and rear wall units 3 are assembled. Thereafter, the steel plate 6 of the front and rear wall units 3 and the steel plate 5 forming the bottom of the marine structure are welded, and the mounting body 7 (the plate 12 when the plate 12 is provided) and the steel plate 5 are welded in the work space 23. Then, the joint concrete 25 is cast and the marine structure is assembled. Note that concrete 18b is separately cast into the work space 23 at the upper end of the third corner unit 4C.

As described above, the outer shell of the offshore structure is constituted by the upper slab unit 1, the side wall unit 2, the front and rear wall units 3, and the corner unit 4.
The marine structure is constructed by welding the attachment bodies 3 and 4 or the attachment body and the steel plate 5 in the work space 23 and welding the joint concrete 25 into the work space 23 also serving as the joint concrete placing part 24. Since the outer shell of the object is assembled, a large-scale operation of manufacturing a frame of the entire offshore structure as in the related art is eliminated, and thus the assembling operation of the offshore structure is facilitated.

Further, since the outer shell of the offshore structure is composed of the divided structural units, the assembling work can be performed simultaneously for each structural unit, so that the labor and days spent for manufacturing can be reduced. As a result, the occupation period of the dock can be shortened, so that the production cost can be greatly reduced.

Next, a second embodiment of the present invention will be described with reference to FIGS.
2, the upper slab unit 1, the side wall unit 2, and the front and rear wall units 3 have the same configuration, and a frame-shaped mounting member 7 smaller than the steel plate 6 is provided on one side surface of the steel plate 6. Are welded, the periphery of the steel plate 6 protruding from the mounting body 7 is defined as an overhang portion 26, the periphery of the overhang portion 26 is a joining side with the periphery of the overhang portion of another structural unit, and On one side surface of the projecting portion 26, a joining concrete placing portion 33 for placing the joining concrete 27 after joining with the other overhanging portion 26 is formed.

As shown in FIGS. 10 and 11, similarly to the first embodiment, rebars 10 and 11 of different directions are placed on the bent portion 9 of the mounting body 7, and The end is extended to the upper side of the overhang portion 26 of the mounting body 7, and the concrete 18 is surrounded by the portion cast in the space surrounded by the joint portion 8 of the mounting body 7 and the bent portion 9 of the mounting body 7. And a portion projecting from the opening to the upper surface of the bent portion 9.

As shown in FIG. 11, a supporting reinforcing bar 28 for holding the positions of the reinforcing bars 10, 11 may be provided on the steel plate 6 as necessary. The other configuration of each structural unit is the same as the configuration of the upper floor slab unit 1 of the first embodiment, and will not be described.

The method of assembling the structural unit will be described in terms of differences from the first embodiment. When the concrete 18 is cast, the concrete 18 is cast up to the upper surface of the bent portion 9 of the attachment 7. Yes, the other assembling methods and order are the same as those in the first embodiment, and a description thereof will be omitted.

Here, a method of joining the upper deck units 1 will be described with reference to FIGS. 11 and 12.
First, the overhanging portions 26 of the steel plate 6 of the upper slab unit 1 are welded by abutting each other. When the mounting body 7 is welded to the steel plate 6 at the time of assembling the upper slab unit 1, heat generated by welding is used. The steel plate 6 may be distorted or twisted.

In the case where the steel plate 6 is distorted or twisted as described above, the welding of the overhanging portions 26 of the steel plate 6 is performed while correcting the welding. Next, concrete 1
The rebars 10, 11 protruding from 8 are welded to each other via a rebar 29, and then, the upper concrete slab is cast by joining concrete 27 to the joining concrete placing portion 33 of the projecting portion 26 of the steel plate 6. Assemble.

As shown in FIG. 12, when the upper slab unit 1 and the side wall unit 2 or the front and rear wall units 3 are joined, the projecting portions 26 of the steel plate 6 are welded to each other, and the reinforcing bars 10 and 11 are joined. Is welded through a joint bar 29 bent at a right angle, and a joint concrete 27 is cast at each corner.

According to the second embodiment of the present invention, even if the steel plate 6 is distorted or twisted by the heat generated when the mounting body 7 is welded to the steel plate 6, the distortion or torsion is corrected and the steel plate 6 is distorted. Welding the overhangs 26 of each other minimizes the distortion of the entire offshore structure, and prevents cracks from occurring in the concrete 18 cast in each structural unit.
The steel plate 6 can be protected from corrosion by the concrete 18.

As in the second embodiment of the present invention, the steel plate 6
The upper slab unit 1, the side wall unit 2, and the front and rear wall units 3 are easily joined to each other without interposing the corner unit as in the first embodiment by employing a configuration in which the overhang portion 26 is provided. The offshore structure can be assembled, so that the configuration of the entire offshore structure can be simplified.

Another assembling method will be described with reference to FIG. 13. If the steel plate 6 is distorted, the overhang portions 26 of the steel plate 6 are welded together while correcting the distortion, and the reinforcing bars 10, 1
1 is bent to form a hook portion 30, and this hook portion 3
0 is welded onto the overhang portion 26 of the steel plate 6, a key reinforcing bar 31 is inserted into each hook portion 30, and an elliptical loop reinforcing bar 32 is wound around the key reinforcing bars 31, and the key reinforcing bar 31 and the loop reinforcing bar 3
2 is welded, and the joint concrete 27 is cast into the joint concrete placing portion 33.

As described above, the hook portions 3 of the reinforcing bars 10 and 11
0 is welded onto the overhang portion 26 of the steel plate 6, a key reinforcing bar 31 is inserted into each hook portion 30, and an elliptical loop reinforcing bar 32 is wound around the key reinforcing bars 31, and the key reinforcing bar 31 and the loop reinforcing bar 32 are formed.
Is welded, and the joint concrete 27 is cast into the joint concrete placing portion 33, whereby the structural units can be firmly joined to each other.

In the second embodiment, the upper slab unit 1, the side wall unit 2, and the front and rear wall units 3 are joined to each other without going through the corner unit. However, the present invention is not limited to this. Projecting part 2 on only one or two predetermined sides of steel plate 6 of the structural unit
6, the upper slab unit 1, the side wall unit 2, and the corner unit shown in the first embodiment are used.
The front and rear wall units 3 can be joined together.

[0035]

As is apparent from the above description, the present invention provides a structural unit in which the outer shell of a structure is composed of a steel plate, a mounting body joined to an end of the steel plate, and concrete cast on the steel plate. This eliminates the need for large-scale work, such as manufacturing the frame of the entire structure, and joins each structural unit in the working space provided in each structural unit, and after welding, joint concrete that also serves as the working space. The structure can be easily assembled by casting joint concrete in the casting portion.

Further, since the production can be performed simultaneously for each structural unit, the labor and the number of days required for producing the entire structure can be reduced, and the occupation period of the dock can be shortened. Therefore, the production cost can be greatly reduced.

Furthermore, since the steel plate is provided with a projection extending from the mounting member, even if the steel plate is distorted or twisted when the mounting member is joined to the steel plate, the distortion or twist can be easily corrected. By welding the overhangs of the steel plate with the distortion and twist corrected as described above, the distortion of the entire structure is minimized, and cracks are prevented from occurring in the concrete poured into each structural unit As a result, the steel plate can be sufficiently protected from corrosion by concrete.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a marine structure manufactured by a structural unit according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the marine structure.

FIG. 3 is a perspective view showing the structure of the structural unit.

FIG. 4 is an enlarged sectional view of an end of the structural unit.

FIG. 5 is a front sectional view of the marine structure after assembling.

FIG. 6 is a plan sectional view of the marine structure after assembly.

FIG. 7 is a cross-sectional view of the joined state of the structural units.

FIG. 8 is a cross-sectional view of another state where the structural units are joined together.

FIG. 9 is a sectional view showing a joint portion between a steel plate serving as a bottom plate of an offshore structure and a structural unit.

FIG. 10 is a perspective view illustrating a configuration of a structural unit according to a second embodiment of the present invention.

FIG. 11 is a cross-sectional view showing a joint between structural units.

FIG. 12 is a partially enlarged perspective view of the same offshore structure.

FIG. 13 is a cross-sectional view showing a method of joining structural units in another embodiment.

FIG. 14 is a partially cutaway perspective view showing the structure of a conventional pontoon.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top floor unit 2 Side wall unit 3 Front and rear wall unit 4 Corner unit 4A 1st corner unit 4B 2nd corner unit 4C 3rd corner unit 6 Steel plate 7 Attachment body 8 Joint 9 Bending part 10 Reinforcing bar 11 Reinforcing bar 12 Plate 15 Steel plate Reference Signs List 16 attachment body 17 bent part 18 concrete 23 work space part 25 jointed concrete 26 overhang part 27 joint concrete 30 hook part of reinforcing bar 31 key reinforcing bar 32 loop reinforcing bar 33 joint concrete placing unit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hidemasa Takahama 5-3-28 Nishikujo, Konohana-ku, Osaka-shi, Osaka Within Hitachi Zosen Corporation (58) Field surveyed (Int. Cl. ⁶ , DB name) E02D 23/00 B63B 35/38

Claims (2)

(57) [Claims] 1. A structural unit constituting an outer shell portion of a structure, wherein a mounting body for welding to another structural unit is provided at an end of the steel plate, and the mounting body has a base end formed of a steel plate. A cross-section L composed of a joint to be joined on the upper side and a bent portion bent substantially parallel to the steel plate surface from the tip of the joint.
Concrete is cast on the side of the steel plate on which the mounting body is provided, and the opposite side of the bent portion to the steel plate is joined to a mounting body provided on another structural unit. A concrete-concrete composite unit comprising: a joint space for casting joint concrete after welding; 2. A structural unit constituting an outer shell of a structure, comprising: a steel plate; and a frame-shaped mounting member provided on one side surface of the steel plate and smaller than the steel plate, wherein the steel plate protrudes from the mounting member. Is a projecting portion, and the mounting body has a joint portion whose base end is joined to a steel plate, and the reinforcing member is bent substantially parallel to a steel plate surface from a tip end of the joining portion to mount the reinforcing bar. Concrete is cast on one side where the mounting body on the steel plate is arranged, and the periphery of the overhang is a joining side with the periphery of the overhang of another structural unit. A steel-concrete composite structural unit characterized in that a joint concrete casting portion is provided on one side of the overhang portion, where the joint concrete is poured after welding the overhang portions.