JP2001254319A - Upper structure of bridge and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the upper structure of a bridge or the like, which has a simple structure and is maintained and managed easily after construction, can be constructed even when an under clearance is narrowed and the size of the lower section of a road surface is limited and has excellent workability. SOLUTION: A plurality of steel shells 3, which are formed in approximately U-shaped cross sections or box-shaped cross sections and have supporting sections 6 on the bridge deck sides of lower sections, are installed at regular intervals in the cross direction of the upper section of a pier or an abutment, and the upper structure of the bridge or the like has girders 2 filled with concrete 20, connecting floor slabs 30a bridged and disposed at regular intervals on the supporting sections 6 of adjacent girders 2 and fixed by bolts and floor slabs 30 laid among these connecting floor slabs 30a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of girders having a supporting portion on the lower bridge surface side, comprising a steel shell filled with concrete inside, and being installed at predetermined intervals on a pier or abutment. The present invention relates to a superstructure such as a bridge having a slab laid therebetween and a method of constructing the same.

[0002]

2. Description of the Related Art As a composite floor slab used for a superstructure such as a bridge, there is an invention described in, for example, JP-A-7-173895. The composite floor slab according to the present invention is a method in which a plurality of steel girders or metal pipes arranged in parallel are implanted with stud dowels that transmit shear force to the upper surface of the steel girders or metal pipes, and concrete is cast thereon, and the steel girders or metal girders Both ends of the pipe are covered with concrete at the ends.

[0003] Then, with such a configuration,
It is possible to omit the complicated production and processing of steel materials such as performed with a plate girder, save labor, speed up construction, and reduce costs.In addition, both ends of a steel girder or metal pipe are covered with concrete at the ends. By doing so, a strong steel-concrete composite structure can be obtained.

[0004]

When the composite slab as described above is used as a superstructure of a bridge, there are the following problems. (1) If the floor slab is damaged, such as cracking of the slab or neutralization of the slab concrete, the slab itself constitutes a part of the main member. Can not. Therefore, if the floor slab is damaged, the entire girder must be replaced. In addition, when repainting a steel girder or a metal pipe, it is necessary to assemble a scaffold at a lower portion, which requires a lot of time and labor, so that there are many problems in maintenance and management such as low economic efficiency.

(2) Further, since the dimension below the road surface is large, in a bridge section where it is necessary to secure a space below the girder,
This composite slab cannot be implemented. In order to secure the space under the girder of this bridge, an approach of gradually raising the road surface is necessary, which significantly increases the bridge length and construction costs.

(3) When transporting and assembling a composite member assembled in a factory, the weight of each individual member becomes large, so large equipment is required at the time of installation, which is uneconomical. Not only that, but also poor workability. (4) In addition, when concrete is cast on site after steel girders or steel pipes are erected, a formwork for concrete casting is necessary, and therefore the workability is poor and time is required for construction. Therefore, the construction period is prolonged.

The present invention has been made in order to solve the above-mentioned problems, and has a simple structure, easy maintenance and management after construction, and a small space under the girder, so that dimensions under a road surface are limited. It is an object of the present invention to obtain a superstructure such as a bridge and the like and a construction method which can be implemented even in a case and has good workability.

[0008]

(1) An upper structure of a bridge or the like according to the present invention comprises a plurality of steel shells each having a substantially U-shaped cross section or a box-shaped cross section and having a supporting portion on a lower bridge surface side, which is a bridge pier or a bridge. A girder that is installed at predetermined intervals in the width direction on the abutment and is filled with concrete inside, and is connected to the supporting part of the adjacent girder by bridging at predetermined intervals and fixed by bolts And a floor slab laid between these connected floor slabs.

(2) The upper structure of a bridge or the like according to the present invention comprises a plurality of steel shells each having a substantially U-shaped cross section or a box-shaped cross section and having a supporting portion on a lower bridge surface side, and having a width on a pier or abutment. Installed at a predetermined interval in the direction, a girder filled with concrete inside, a cable stretched between the girder above the support portion of the girder, and a fitting groove on the lower surface for fitting the cable, And a floor slab laid between the adjacent supporting portions by fitting the fitting groove to the cable.

(3) Further, the upper structure of a bridge or the like according to the present invention comprises a plurality of steel shells each having a substantially U-shaped cross section or a box-shaped cross section and having a support portion on the lower bridge surface side having a width on a pier or abutment. A girder installed at predetermined intervals in the direction and filled with concrete inside, a shear joint member installed at a predetermined interval on a support portion of the girder, and a noble through hole fitted to the shear joint member And a floor slab which is fitted between the through-holes and the shear joint member, filled with concrete, and laid between adjacent supporting portions.

(4) Any one of the above-mentioned girders (1) to (3) is formed in an arch shape having a substantially U-shaped cross section or a box-shaped cross section and having a maximum height at a substantially central portion in the longitudinal direction. (5) Circular, elliptical or rectangular openings, or triangular and inverted triangular openings are alternately provided at predetermined intervals in the longitudinal direction of any of the above-mentioned girders (1) to (4).

(6) A diaphragm is provided in the steel shell of any of the above (1) to (5). (7) A stiffener is provided on the inner wall of the steel shell of any of the above (1) to (6). (8) A multilayer bridge surface is provided on an upper structure such as a bridge of any of the above (1) to (3) or (5) to (7).

(9) The method for constructing a superstructure such as a bridge according to the present invention comprises the steps of: forming a plurality of steel shells having a substantially U-shaped cross section or a box-shaped cross section and having a support portion on the lower bridge surface side on a pier or abutment; A step of installing at predetermined intervals in the width direction, a step of filling concrete in the steel shell, and a floor slab according to any one of claims 1, 2 and 3 on a support portion of the adjacent steel shell. Laying step.

(10) The method for constructing a superstructure such as a bridge according to the present invention is characterized in that concrete is filled in a steel shell having a substantially U-shaped cross section or a box-shaped cross section and having a supporting portion on the lower bridge surface side. 4. A step of installing a plurality of girders at predetermined intervals in the width direction of a bridge pier or an abutment; and a step of laying a floor slab on a support portion of the adjacent girders by any of the means of claim 1, 2, or 3. It is provided with.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] FIG. 1 is a schematic side view showing a part of a cross-section for explaining an entire structure of a superstructure such as a bridge according to Embodiment 1 of the present invention. 2 is FIG.
3 is a cross-sectional view of the main part of FIG. 2 as viewed from obliquely below. In the figure, reference numeral 1 denotes an upper structure of a bridge, which has a support portion 6 at a lower end portion, and is provided at predetermined intervals in a width direction on a pier P (or including an abutment, the same applies hereinafter) erected on the ground G. Steel shell 3 installed and filled with concrete 20 inside
And a plurality of precast concrete floor slabs 30 (hereinafter simply referred to as floor slabs) laid between the support portions 6 of the girder 2.

The steel shell 3 has, for example, two steel plates 4a and 4b having a length corresponding to the span of a bridge and a predetermined width (height) opposed to each other at a predetermined interval. Then, a bottom plate 5 made of a steel plate having the same length as the steel plates 4a and 4b and having a width wider than the interval between the steel plates 4a and 4b is provided at the lower ends of the steel plates 4a and 4b, as shown in FIG. The edge is aligned with the side wall of the steel plate 4a (or 4b), so that the other edge protrudes from the side wall of the steel plate 4b (or 4a) and is joined together by welding, and has a substantially U-shaped cross section with an open top. The support portion 6 of the floor slab 30 is formed by a protrusion of the bottom plate 5 from the steel plate 4a (or 4b). Reference numeral 7 denotes a bolt insertion hole provided at a predetermined interval in the support portion 6.

In the above description, the case where the steel shell 3 is formed to have a substantially U-shaped cross section with an upper opening is shown, but the upper opening may be formed into a box-shaped cross section by closing it with a steel plate. In this case, it is necessary to provide an injection hole for injecting concrete into the steel plate.

Reference numeral 30 denotes a floor slab manufactured in advance in a factory or the like, the width of which is slightly smaller than the inner dimension between the adjacent girders 2 and is formed to a predetermined length. As shown in FIG. 5, a shear bonding key 31 formed of a convex portion and a concave portion having, for example, a triangular or trapezoidal shape is formed. As shown in FIG. 3, one or a plurality of bolt insertion holes 32 are provided vertically in the vicinity of both edges in the width direction of some floor slabs 30a, and the upper surface side is large. (Hereinafter, this floor slab 30a is referred to as a connected floor slab.)

Next, an example of the construction method of the present embodiment configured as described above will be described. (1) The plurality of steel shells 3, the plurality of slabs 30, and the connecting slabs 30a manufactured in the factory are transported to the construction site, and the two steel shells 3 are moved in the width direction on the bridge girder P as shown in FIG. At predetermined intervals. At this time, the support part 6 is positioned inside. (2) Next, the concrete 20 is filled into the steel shell 3 from the upper opening (in the case of a box-shaped cross section, an injection hole). The girder 2 in which the concrete 20 is filled in the steel shell 3 in advance may be installed on the pier P.

After the concrete 20 has hardened, the support portions 6 are bridged to form a fixed interval (this interval is related to the length of the floor slab 30 or n times the length thereof.
Is provided. The drawing shows a case where an interval corresponding to the length of three slabs 30 is provided).
3, a high-strength bolt 41 is inserted from above into a bolt insertion hole 32 provided in the connecting floor slab 30a, and a lower portion protrudes from the bolt insertion hole 7 provided in the support portion 6, as shown in FIG. Then, it is fixed by the nut 42. At this time, a mortar or an elastic material 8 may be laid on the support portion 6.

A mortar or an elastic material 8 is laid on the upper surface of the supporting portion 6 between the connecting slabs 30a fixed with the high-strength bolts 41, if necessary.
Are laid and joined. At this time, the floor slab 30 and the connecting floor slab 30a adjacent to each other in the traveling direction of the vehicle or the like are sequentially joined by the shear joining key 31 via epoxy resin, mortar, or the like.

[Examples] The specifications of the superstructure such as a bridge according to the present embodiment are variously changed according to the type and scale of the target structure. It is as follows. Steel shell 3 is 9mm thick,
Two steel plates 4a and 4b having a height of 5m and a length of 40m are arranged facing each other with a spacing of 0.5m, and a steel plate having a thickness of 38mm, a width of 0.7m and a length of 40m is provided at the lower end of the steel plates 4a and 4b. A bottom plate 5 made of a steel plate (for example, 4a)
And the other side was projected by 0.2 m from the side wall of the other steel plate 4b to form the support portion 6.

The steel shell 3, the slab 30, and the connecting slab 30a configured as described above are transported to the site, and the steel shells 3 are installed on the pier P at intervals of 4.6 m. Concrete 2
0 was filled. After the concrete 20 has hardened, mortar is laid at a predetermined interval on the support portion 6 with a thickness of approximately 10 mm, and a connecting floor slab 30a having a thickness of 30 cm, a width of 4 m and a length of 2 m is provided thereon, (F10T) high strength bolt 41
Is inserted through the bolt insertion holes 32 and 7, and is fixed with the nut 42. Next, a mortar 8 is laid with a thickness of about 10 mm on the supporting portion 6 between the connecting slabs 30a, and the slab 30 is further laid thereon.
Were connected in sequence in the running direction of the vehicle or the like by a shearing key 31 via an epoxy resin and joined to the support portion 6.

In the upper structure of the bridge and the like according to the present embodiment configured as described above, the steel shell 3 mechanically bears the main stress as a girder, and the floor slab 30 (hereinafter referred to as a connected floor slab). 30a) does not receive the main stress as a girder and plays a role of transmitting a live load to the steel shell 3. Since the girders 2 are formed by the highly rigid steel shells 3 filled with the concrete 20, low frequency vibration hardly occurs, low frequency noise can be suppressed, and noise generated from the roadway is cut off. be able to.

Further, since the floor slabs 30 are individually joined to the girders 2, if the floor slabs 30 are damaged, only the floor slabs need to be replaced, and the replacement is easy. Furthermore, since most of the girders 2 are above the road surface, the steel material can be painted from the road surface position, and thus no scaffolding is required. For these reasons, the present invention is extremely effective in maintenance and management.

Further, since the lower part of the spar 2 is substantially equal to the road surface height, the space below the floor slab 30 requires almost no structural members. As a result, a significantly larger space under the girder than the conventional synthetic slab can be secured, and even under conditions where the girder height is narrow, it is possible to design a route that minimizes the height of the line following it. is there. This reduces the scale of the bridge and can significantly reduce construction costs.

Further, the steel shell 3 having the support portion 6 for supporting the floor slab 30 for forming the bridge surface is installed on the pier P, and then the concrete 20 is filled in the steel shell 3 and the beam 2
After the concrete 20 is hardened, the floor slab 30 is laid on the support portion 6 of the spar 2, so that a formwork at the time of concrete casting is unnecessary. Further, when the concrete 20 is poured into the steel shell 3 at the site, it is not necessary to carry a heavy object and erection, so that high workability is provided.

Further, since the supporting portions 6 of the adjacent girders 2 are fixed by the connecting floor slab 30, the girders 2 can be held at a predetermined position and separation can be prevented. Furthermore, since it is a steel shell structure of a concrete filling type, buckling design of steel material is unnecessary, and design is easy. Furthermore, since there are many variations of the structure forming formula, the shape can be changed according to the plan.

In the above description, the case where the connecting floor slabs 30a are fixed on the support portions 6 of the spar 2 at predetermined intervals by the high-strength bolts 41 and the floor slabs 30 are installed between them is shown. A part of the floor slabs 30 are composed of the connecting floor boards 30a and are fixed on the support portions 6 by the high-strength bolts 41 continuously, or all the floor slabs 30 are supported by the high-strength bolts 41 as the connecting floor slabs 30a. 6 may be fixed.

[Second Embodiment] FIG. 6 is a perspective sectional view of an upper structure of a bridge or the like according to a second embodiment of the present invention as viewed obliquely from above, and FIGS. 7 and 8 are explanatory views of the main parts thereof. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the present embodiment, three steel shells 3 are installed at predetermined intervals in the width direction on the pier P, and the steel shells 3 installed on both sides position the support portion 6 inside, and Figure 4
As shown in (b), the steel plate 3 having the support portion 6 is provided by projecting the bottom plate 5 to both sides. The steel shell 3 is filled with concrete 20 to form the girder 2 and the adjacent girder 2
The floor slab 30 is laid on the supporting portion 6 of the above-mentioned.

Numeral 33 denotes at least one, preferably at least two, substantially semicircular cross-section fitting grooves provided on the lower surface of the floor slab 30 in the width direction (the direction of the spar 2). As shown in FIGS. 7 and 8, both ends are stretched over the support portion 6 of the spar 2 at predetermined intervals and coated with resin fixed by a cable socket 44 outside the spar 2 as shown in FIGS. In this example, the cable was SWPR.
19PC steel strand was used.

In the present embodiment, when the floor slab 30 is laid, the fitting groove 33 of the floor slab 30 is fitted to the resin-coated cable 43 and sheared through the epoxy resin or the like in the traveling direction of the vehicle or the like. With the joining key 31, they are sequentially connected and installed on the support portion 6. In laying the floor slab 30, mortar 8 or the like may be laid on the support portion 6, or these may be omitted and directly installed. In the present embodiment, the same effects as in the first embodiment can be obtained. However, when laying the floor slab 30, the fitting groove 33 provided therein is fitted to the resin-coated cable 43. Positioning is easy.

Although FIG. 7 shows the upper structure of a bridge or the like consisting of two girders 2 for ease of explanation, as shown in FIG. A single resin-coated cable 43 penetrates from one spar 2 to the other spar 2 through the center spar 2 and is fixed at both ends by a cable socket 44.
It is fixed to the spar 2 so that the penetrated resin-coated cable 43 does not move. Thus, one resin-coated cable 43 can be laid in the entire width direction of the upper structure.

In the above description, the fitting grooves 33 are provided on the lower surfaces of all the floor slabs 30, and the fitting grooves 33 are fitted to the resin-coated cables 43 provided between the girders 2 to lay the floor slabs 30. Although the case is shown, for example, the resin-coated cable 4 is provided at a predetermined interval.
3 and a floor slab 30 having a fitting groove 33 is attached thereto and fixed, and one or more floor slabs 30 without the fitting groove 33 are laid between the fixed floor slabs 30. You may.

[Third Embodiment] FIG. 9 is a sectional view of a main part of a third embodiment of the present invention, and FIG. 10 is an explanatory view of a part thereof.
In the present embodiment, as shown in FIG. 9, the spar 2 and the floor slab 30 are joined by a shear joining member 45. That is, as shown in FIG. 10 (a), a plurality of rod-shaped shear joining members 45 such as stud dowels are joined to the upper surface of the support portion 6 provided on the steel shell 3 by welding or the like.
At a position facing the shear bonding member 45 of the floor slab 30, FIG.
As shown in FIG. 0 (b), a through hole 34 is provided.

When laying the floor slab 30 on the support portion 6 of the spar 2, mortar or the like 8 is laid on the support portion 6 as necessary, and then the through holes 34 provided in the floor slab 30 are connected to the shear bonding members 45. And is placed on the support 6. Then, the mortar or concrete 20 is poured into the through holes 34 and solidified, so that the shear bonding member 45 and the floor slab 30
And are joined together. Accordingly, the floor slab 30 is positioned by the shear bonding member 45 and the movement in the front, rear, left, and right directions is restricted, so that the beam 2 and the floor slab 30 can be firmly integrated.

In this embodiment, the same effect as in the first embodiment can be obtained. In the above description, the case where a plurality of rod-shaped shear joining members 45 such as stud dowels are provided on the support portion 6 has been described.
A plurality of steel members in the shape of a letter may be attached at predetermined intervals in the longitudinal direction of the support portion 6 to form a shear joining member. In addition, floor slab 30
Are fixed on the support portion 6 at predetermined intervals by a shear bonding member 45, and the normal floor slab 30 is interposed between the fixed floor slabs 30.
May be laid.

[Embodiment 4] In Embodiments 1 to 3,
Although the supporting portion 6 of the steel shell 3 and the floor slab 30 were joined using the high-strength bolt 41, the resin-coated cable 43, or the shear joining member 45, the present embodiment does not use such a member. A mortar or an elastic material 8 is laid on the support portion 6, and the floor slab 30 is placed thereon and joined. In this embodiment, since the joining between the girder 2 and the floor slab 30 is extremely simple, the present embodiment is effective for a small-scale bridge or the like.

[Fifth Embodiment] FIG. 11 is a perspective sectional view of an upper structure according to a fifth embodiment of the present invention as viewed obliquely from below. The same parts as those in the second embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, for example, a bridge surface is stacked in two steps so that a large amount of traffic can be consumed in a narrow place.

In the present embodiment, the height of the steel shell 3 described in the first embodiment is formed to be high, and the steel shell 3 is reinforced with a stiffener 9 at a predetermined height above the support portion 6. A plurality of steel shells 3 provided with the support portions 6a are installed on the pier P, and concrete 20 is filled therein to form the girder 2. A resin-coated cable 43 is stretched between the girders 2 above the upper and lower support portions 6 and 6a, the floor slab 30 having the fitting groove 33 on the lower surface is laid on the lower support portion 6, and the upper support portion 6 is laid. The floor slab 30 is similarly laid on 6a to form a bridge or the like having a two-layer bridge surface. Although the figure shows a case where the bridge surface is composed of two layers, three or more layers may be provided.
In attaching the floor slab 30 to the support portion 6, the means as in the first, third or fourth embodiment may be used.

As described above, in the present embodiment,
Since the bridge surface was expanded upward without increasing the width of the bridge, the congestion can be reduced with a simple structure even in a narrow place. In this embodiment, the bridge surface may be configured as a multi-layer from the beginning of construction, or a bridge or the like which was initially a single-layer bridge surface as in the first embodiment may be increased in traffic volume. Accordingly, a bridge surface may be additionally provided.

[Sixth Embodiment] FIG. 12 is a schematic side view showing the entire structure of a sixth embodiment of the present invention, and FIG. 13 is a perspective view of the upper structure of FIG. 12 viewed obliquely from below. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the height of the steel shell 3a in the longitudinal direction is gradually increased so that the steel shell 3a is formed in an arch shape having a maximum height substantially at the center of the span of the bridge, and concrete 20 is formed therein.
Is filled to form the girder 2. Although not shown, in this embodiment, the floor slab 30 is attached to the support portion 6 by any means of the first to fourth embodiments.

The construction method of the present embodiment is the same as that of the first embodiment.
However, in the embodiment, in the steel plates 4c and 4d having a length of 40 m, both ends of the beam 2 having a small member force are reduced (2 m in the embodiment) to reduce the cross-sectional area of the beam 2, Almost the center of the span where the member force is large is raised (in the embodiment, 5
m) to increase the cross-sectional area of the spar 2, so that substantially the same effects as in the first embodiment can be obtained, and in particular, the steel shell can be reasonably lightened. Further, since the spar 2 is formed in an arch shape, the vertical force acting on the spar 2 applies an axial compressive force to the steel shell 3a by the arch action.
a) The bending strength can be improved.

[Seventh Embodiment] FIGS. 14 and 15 illustrate a seventh embodiment of the present invention. The same parts as in the first embodiment are denoted by the same reference numerals. In FIG. 14, a plurality of openings 10 having a circular shape, an elliptical shape, a rectangular shape, or the like are provided at predetermined intervals in the longitudinal direction of the spar 2. In FIG. 15, triangular and inverted triangular openings 11a and 11b are provided alternately at predetermined intervals in the longitudinal direction of the spar 2. In any case, the floor slab 30 is fixed on the support portion 6 of the spar 2 by any of the means of the first to fourth embodiments.

In the present embodiment, the same effects as those of the first embodiment can be obtained.
Since a and 11b are provided, the field of view of the driver is widened and the traveling performance can be improved. In addition, in the case of FIG. 15, since the portion where the amount of stress generation is small is opened and formed in a truss shape, the steel shell can be significantly reduced in weight with a slight decrease in the load carrying capacity.

[Eighth Embodiment] FIG. 16 is a schematic front view of an eighth embodiment of the present invention, partly in section, and FIG.
FIG. 6 is a perspective cross-sectional view as viewed obliquely from below. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
In the present embodiment, an exhaust pipe 12 is provided in a steel shell 3 and connected to an exhaust gas inlet 13 provided on the bridge surface side of the steel shell 3. On the other hand, an air purifier A for sucking and purifying exhaust gas is provided near a pier P, and the air purifier A and an exhaust pipe 12 are connected by a pipe 14. The floor slab 30 is fixed on the support 6 of the spar 2 by any of the means of the first to fourth embodiments.

In this embodiment, the same effects as those in the first embodiment can be obtained, but the exhaust gas sucked from the exhaust gas inlet 13 provided in the steel plate on the bridge surface side can be used as an exhaust pipe. 12, since the air is sent to the air purifier via the pipe 14 and is purified, it is possible to realize a road on which the air is not polluted by the exhaust gas.

[Embodiment 9] In the following embodiment,
Matters common to the superstructure such as the bridge of the first to eighth embodiments will be described. Although the structure of the steel shell 3 has been described in the first embodiment (FIG. 4), another embodiment of the steel shell 3 is shown in FIG. FIG. 18A shows a case where the bottom plate 5 is formed in a triangular shape having a base having a width wider than the interval between the steel plates 4a and 4b (or 4c and 4d, the same applies hereinafter). The support portions 6 are formed by welding to the lower end portions of 4a and 4b and projecting portions. In addition, steel shell 3 (or 3
a, the same shall apply hereinafter), the support portions 6 may be provided on both sides of the steel plates 4a and 4b using wider bases.

FIG. 18B shows an L-shape formed by bending the lower part of one steel plate (for example, 4a) outward at right angles and welding the bottom plate 5 to the lower end through a vertical piece. The support portion 6 is formed by a bent portion. In the case where the support portions 6 are provided on both sides of the steel shell 3, the lower portions of the steel plates 4a and 4b may be bent at right angles to form an inverted T-shape, and the support portions 6 may be formed by the bent portions on both sides. Good.

Further, FIG. 18C shows that one steel plate (for example, 4a) is bent obliquely inward and the other steel plate 4b is bent.
, The lower portion is bent outward at a right angle, the bottom plate 5 is welded to the lower end portion via a vertical piece, and the support portion 6 is formed by a bent portion. When the support portions 6 are provided on both sides of the steel shell 3, the support portions 6 may be formed by bending the lower sides of the steel plates 4a and 4b diagonally inward and then bending the lower portions outward at right angles. According to the present embodiment, the strength of the support portion can be further increased. The structure of the support portion 6 provided below the steel shell 3 is not limited to the above, and may be an appropriate structure.

[Tenth Embodiment] FIG. 19 is a perspective view of an upper structure according to a tenth embodiment of the present invention as viewed obliquely from below. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the present embodiment, diaphragms 15 serving as nodes are provided at regular intervals in a steel shell 3 having a substantially U-shaped cross section or a box-shaped cross section. The construction method of the present embodiment is almost the same as that of the first embodiment,
By providing the diaphragm 15, the steel shell 3 and the concrete 20 filled therein can be mechanically integrated. In this embodiment, the second embodiment is described.
In the upper structure 8 as well, the diaphragm 11 can be provided in the steel shell 3 in the same manner.

[Embodiment 11] In the present embodiment, FIG.
As shown in FIGS. 0 (a) to (d), a plurality of stiffeners 16 are provided at substantially equal intervals in the vertical direction on opposed inner walls of a steel shell 3 (or 3a, the same applies hereinafter) provided with various support portions 6. Is provided. The stiffener 16 is, for example, as shown in FIG. 21 (a), made of a steel material having a length substantially equal to the steel shell 3 and having a plurality of concrete passage holes 17 provided in a horizontal piece and having an L-shaped cross section. The vertical piece is joined to the inner wall of the steel shell 3 by welding. The stiffener 16 may be provided on the inner wall of the bottom plate 5 as needed.

According to the present embodiment, since the plurality of stiffeners 16 are provided on the inner wall of the steel shell 3, the shape of the steel shell 3 is maintained, and the steel shell 3 and the concrete 20 are further integrated. Can be promoted. In the above description, the case where the stiffener 12 having a length substantially equal to that of the steel shell 3 is provided on the inner wall of the steel shell 3 has been described. However, as shown in FIG. The stiffeners 16a may be mounted on the same line on the inner wall of the steel shell 3 at predetermined intervals in the longitudinal direction and in multiple stages in the vertical direction. Further, instead of the L-shaped stiffeners 16 and 16a, for example, an I-shaped stiffener or a plurality of stud dowels may be attached by welding.

[0055]

(1) According to the first to third aspects of the present invention, openings are provided at predetermined intervals in a longitudinal direction in a substantially U-shaped cross section or a box-shaped cross section, and a support portion is provided on a lower bridge surface side. A plurality of steel shells are installed at predetermined intervals in the width direction on a bridge pier or abutment, and a girder filled with concrete is bridged at a predetermined interval on the support of an adjacent girder. A slab fixed between the slabs and a slab laid between the slabs, or a cable stretched between the girders above the support part of the girder, and a fitting fitted to the cable on the lower surface. A floor slab having a mating groove and laying between the supporting portions by fitting the fitting groove to the cable, or a shear joining member installed at a predetermined interval on the supporting portion of the girder, It has a through hole that fits into the shear joining member. With a slab laid between support portions adjacent filling the cleat.

The inventions according to the first to third aspects of the present invention have a simple structure and do not require a buckling design of a steel shell.
Reduces weight, does not require formwork when placing concrete, does not separate steel shells, does not generate low-frequency noise, blocks out noise, secures a large space under the girder, upper part It is possible to obtain remarkable effects such as the possibility of additional construction work to the route, and the maintenance and management after construction.

(2) According to a fourth aspect of the present invention, any of the girders of the above (1) is formed in an arch shape having a substantially U-shaped cross section or a box-shaped cross section and a substantially central portion in the longitudinal direction having a maximum height. Therefore, the effect of the above (1) is obtained, and in particular, the steel shell can be reasonably reduced in weight. Further, by forming the girder in an arch shape, the vertical force acting on the girder applies an axial compressive force to the steel shell by the arch action, so that the bending strength of the steel shell can be improved.

(3) The invention of claim 5 is characterized in that openings of circular, elliptical or rectangular shapes, or openings of triangles and inverted triangles are alternately arranged in the longitudinal direction of the beam of (1) or (2). Because of the provision, not only the girder is reduced in weight and the workability is improved, but also the visibility of the driver is widened and the traveling performance is improved. When the triangular and inverted triangular openings are alternately provided, the truss shape is formed by opening the part where the amount of stress generation is small, so the steel shell is lightened with a slight decrease in load capacity. can do.

(4) The invention according to claims 6 and 7 is characterized in that (1)
-Arranging a diaphragm in any of the steel shells of (3),
Alternatively, since the stiffener is provided on the inner wall of the steel shell, the steel shell and the concrete filled therein can be more firmly integrated.

(5) The invention according to claim 8 is characterized in that:
In the superstructure such as the bridge of (3) or (4), since the bridge surface is multi-layered, traffic congestion can be reduced even in a narrow place. In addition, when the traffic volume increases, a bridge surface can be additionally provided on an existing bridge or the like.

(6) According to the ninth aspect of the present invention, a plurality of steel shells each having a substantially U-shaped cross section or a box-shaped cross section and having a support portion on the lower bridge surface side are provided in a predetermined width direction on the pier or abutment. The process of installing at intervals, the process of filling concrete in the steel shell,
The step of laying a floor slab on the supporting portion of the adjacent steel shell by any one of the above (1).
In addition to the effect of (1), the workability is high, so that the construction cost can be reduced and the construction period can be shortened.

(7) The invention according to claim 10 is characterized in that
Installing a plurality of girders filled with concrete in a steel shell having a support portion on the lower bridge surface side in a U-shaped cross section or a box-shaped cross section at predetermined intervals in the width direction of the pier or abutment; The step of laying the floor slab on the support portion of the girder by any of the above-mentioned means (1), so that the same effect as in the above-mentioned (6) can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a part of a cross section for explaining an entire configuration of a first embodiment of the present invention.

FIG. 2 is a perspective view of FIG. 1 as viewed obliquely from below.

FIG. 3 is a sectional view of a main part of FIG. 2;

FIG. 4 is a sectional view of the steel shell of FIGS. 2 and 6;

FIG. 5 is a side view showing an example of the floor slab of FIG. 2;

FIG. 6 is a perspective cross-sectional view of the second embodiment as viewed from obliquely below.

FIG. 7 is an explanatory diagram of a main part of FIG. 6;

FIG. 8 is a side view of the floor slab of FIG. 7;

FIG. 9 is an explanatory diagram of a main part of a third embodiment of the present invention.

FIG. 10 is a perspective view of a main part of FIG. 9;

FIG. 11 is a perspective view of the fifth embodiment of the present invention as viewed obliquely from below.

FIG. 12 is a schematic side view for explaining the overall configuration of Embodiment 6 of the present invention.

FIG. 13 is a perspective cross-sectional view as viewed from obliquely below in FIG. 12;

FIG. 14 is a schematic side view for explaining the overall configuration of Embodiment 7 of the present invention.

FIG. 15 is a schematic side view for explaining the whole of another example of the seventh embodiment of the present invention.

FIG. 16 is a side sectional view for illustrating the entire configuration of an eighth embodiment of the present invention.

FIG. 17 is a perspective view of FIG. 16 as viewed obliquely from below.

FIG. 18 is an explanatory diagram of a steel shell according to Embodiment 9 of the present invention.

FIG. 19 is a perspective cross-sectional view of an upper structure according to a tenth embodiment of the present invention as viewed obliquely from below.

FIG. 20 is an explanatory diagram of a steel shell according to Embodiment 11 of the present invention.

21 is an explanatory view of the stiffener of FIG. 20.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper structure of bridge 2 Girder 3, 3a Steel shell 4a, 4b Steel plate 6, 6a Support part 7 Bolt insertion hole 10, 11a, 11b Opening 12 Exhaust pipe 15 Diaphragm 16 Stiffener 20 Concrete 30 Floor slab 30a Connection floor slab 31 shear joining key 32 bolt insertion hole 33 fitting groove 34 through hole 41 high strength bolt 43 resin coated cable 44 shear joining member

Claims (10)

[Claims] 1. A plurality of steel shells having a substantially U-shaped cross section or a box-shaped cross section and having a support portion on a lower bridge surface side are installed at predetermined intervals in a width direction on a pier or abutment, and the inside is filled with concrete. And a connecting slab, which is arranged on a support portion of the adjacent spar at a predetermined interval, and which is fixed by bolts, and a slab laid between the connecting slabs. A superstructure such as a bridge characterized by the following. 2. A plurality of steel shells having a substantially U-shaped cross section or a box-shaped cross section and having a support portion on the lower bridge surface side are installed at predetermined intervals in the width direction on the pier or abutment, and the inside is filled with concrete. A girder, a cable extending between the girder above the support portion of the girder, and a fitting groove on a lower surface for fitting the cable, and the fitting groove is fitted to the cable to be adjacent thereto. An upper structure of a bridge, such as a bridge, comprising a floor slab laid between support portions. 3. A plurality of steel shells each having a substantially U-shaped cross section or a box-shaped cross section and having a supporting portion on the lower bridge surface side are installed at predetermined intervals in the width direction on the pier or abutment, and the inside is filled with concrete. A spar, a shear joining member installed at a predetermined interval on a support portion of the spar, and a noble through-hole to be fitted to the shear joining member, wherein the through-hole is fitted to the shear joining member. An upper structure such as a bridge, comprising a concrete-filled floor slab laid between adjacent supporting portions. 4. The spar according to claim 1, wherein the spar is formed in an arch shape having a substantially U-shaped cross section or a box-shaped cross section and a substantially central portion in a longitudinal direction having a maximum height. Superstructure such as a bridge. 5. The method according to claim 1, wherein openings of circular, oval, rectangular or the like, or openings of triangles and inverted triangles are alternately provided at predetermined intervals in the longitudinal direction of the girder.
Superstructure such as a bridge described in any of the above. 6. The upper structure of a bridge or the like according to claim 1, wherein a diaphragm is provided in the steel shell. 7. The upper structure of a bridge or the like according to claim 1, wherein a stiffener is provided on an inner wall of the steel shell. 8. The superstructure of a bridge or the like according to claim 1, further comprising a multilayer bridge surface. 9. A step of installing a plurality of steel shells each having a substantially U-shaped cross section or a box-shaped cross section and having a support portion on a lower bridge surface side at predetermined intervals in a width direction on a pier or an abutment; And a step of laying a floor slab by means of any one of claims 1, 2 and 3 on a support portion of the adjacent steel shell. Superstructure construction method. 10. A plurality of girders having a substantially U-shaped cross section or box-shaped cross section and filled with concrete inside a steel shell having a supporting portion on the lower bridge side at predetermined intervals in the width direction of the pier or abutment. A method for constructing a superstructure such as a bridge, comprising a step of installing and a step of laying a floor slab on a support portion of an adjacent girder by any one of claims 1, 2, and 3. .