JP2014091961A5 - - Google Patents

Description

Floor slab bridge

  In the present invention, slab concrete is cast over the bridge girder in the longitudinal direction between the side surfaces of the bridge girder made of steel having flange portions such as H-shaped steels arranged in parallel in the bridge width direction, and a composite structure of the bridge girder and slab concrete. In particular, the present invention relates to a structure on the lower surface of the bridge girder.

  Conventionally, floor slab bridges have adopted a flexible coupling structure in which a bridge girder is supported on a bridge seat surface of a concrete pier via a rubber bearing, and the rubber girder absorbs expansion, contraction, or twisting of the bridge girder. However, with such a flexible structure, there is a risk of falling over a severe earthquake, and the function of the rubber bearing is degraded due to aging, and the construction cost is increased because it is very expensive. Was. Therefore, a floor slab bridge has been proposed in which the rigid coupling strength between the bridge girder and the concrete pier is improved to effectively suppress expansion, contraction, or twisting of the bridge girder (see Patent Document 1).

  In this floor slab bridge, slab concrete is placed between the side faces of a plurality of bridge girders arranged in parallel in the width direction of the bridge over the longitudinal direction of the bridge girder, and further on the bridge seat surface of the concrete pier supporting the bridge girder. The connection concrete which embeds the bridge girder part supported by the bridge seat surface is struck, and the slab concrete and the concrete pier are concretely connected to each other via the connection concrete. As a result, the strength of the connecting concrete itself against expansion and contraction is synergistically increased, and a floor slab bridge structure that is extremely effective as a preventive measure against falling bridges against severe earthquakes is obtained.

Japanese Patent No. 4318694

  By the way, steel materials such as H-shaped steel are usually used for bridge girders of floor slab bridges. In the conventional slab bridge (disclosed in Patent Document 1) described above, H-shaped steel is used for the bridge girder, and the bottom surface structure of the slab bridge (bridge girder) is as shown in FIGS. Further, among the upper flange 102 and the lower flange 103 of the H-shaped steel 101 to be a bridge girder, a lower opening 105 extending in the longitudinal direction of the bridge girder (H-shaped steel) 101 is provided between the lower flanges 103 as a closing member (a frame made of cedar material). 106), and concrete 107 is cast through the upper opening 104 to form slab concrete 108. In addition, the code | symbol 109 in Fig.11 (a) is a basic reinforcement.

  However, in the conventional structure, as shown in FIG. 11B, the form frame 106 made of cedar is arranged between the side surfaces of the lower flange 103 so as not to reduce the thickness of the concrete 107 as a whole. As time passes, the mold 106 will rot and the rotten mold 106 may fall under the bridge. Further, since the mold 106 is fitted between the lower flanges 103 and 103 and is held by surface adhesion with the concrete 107, the cedar is in a state of being easily dropped even if it does not rot. It is not preferable from the environmental point of view that the formwork 106 falls into the river, and there is a concern that a safety problem may occur if there is traffic of people or cars under the bridge. In order to prevent this, it is conceivable to take measures to build a net under the bridge after the floor slab bridge is completed, but it takes time and money.

  The present invention has been made in view of the above situation, and its purpose is to increase the strength and durability of the mold and to prevent the mold from dropping due to deterioration over time. As a result, the strength and durability are improved. The purpose is to provide a floor slab bridge.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The floor slab bridge according to claim 1 of the present invention is a concrete in which slab concrete 4 is placed between the side faces of the bridge girders 2 arranged in parallel in the bridge width direction over the longitudinal direction of the bridge girder 2 and the bridge girder 2 is supported. The connecting concrete 12 embedded in the bridge girder portion 11 supported on the bridge seat surface 13 of the bridge pier 3 is struck, and the slab concrete 4 and the concrete pier 3 are concretely bonded via the connecting concrete 12. A connecting structure comprising a connecting rod 14 embedded in the concrete pier 3 and projecting upward from the bridge seat surface 13 of the pier 3; the protruding portion of the connecting rod 14 is inserted through the bridge girder portion 11; A stopper is provided at the upper end projecting portion of the connecting rod 14 inserted through the bridge girder portion 11, and the stopper is seated on the upper surface of the bridge girder portion 11 so that each bridge girder 2 is connected to the concreting portion. In the floor slab bridge 1 configured by connecting the preparative piers 3,
The bridge girder 2 is made of a steel material having a flange portion at a lower portion, and the plate-like formwork 15 arranged on the lower surface of the floor slab bridge 1 closes the space between the bridge girder 2. It is characterized that you have been placed in.

The mold 15 may be formed of a concrete plate material such as plastic concrete or resin concrete.

The floor slab bridge according to claim 2 is the floor slab bridge according to claim 1 , wherein a hook 16 is provided on an upper surface of the formwork 15, and when the formwork 15 is arranged, the hook 16 is arranged in a basic arrangement. It is characterized by being hooked on a muscle (abdominal threading rod) 17.

The floor slab bridge according to claim 3 is characterized in that the plate- shaped formwork 15 is made of concrete plate material, plastic concrete, or resin concrete.

The floor slab bridge according to claim 4 is characterized in that the formwork 15 is obtained by putting a reinforcing bar or a fiber material in concrete .

  According to the floor slab bridge according to claim 1 of the present invention, the formwork is integrated with the concrete to be placed, that is, integrated with the bridge, and hardly deteriorates in terms of diameter, strength and durability. Can be improved. Moreover, the strength and durability of the slab bridge are improved by using this formwork.

According to the floor slab bridge of claim 1 , the formwork can be prevented from falling by placing the formwork on the flange of the bridge girder.

According to the floor slab bridge of the second aspect, since the mold frame is held in a suspended state, the mold frame can be more reliably prevented from falling.

According to the floor slab bridge according to claim 3, resin concrete has several times the strength of cement concrete, it is possible to increase the strength and durability of the mold more.

According to the floor slab bridge of claim 4 , the strength of the formwork can be further increased.

It is sectional drawing in the bridge length direction of the bridge girder of the floor slab bridge concerning the present invention. It is sectional drawing in the bridge length direction of the slab concrete of the floor slab bridge. It is sectional drawing of the bridge width direction of the said floor slab bridge. It is sectional drawing in the horizontal surface of the said floor slab bridge. It is sectional drawing of the site | part which provided the connection rod in the connection concrete part in the said floor slab bridge. It is sectional drawing of the site | part which provided the suspended reinforcement in the slab concrete part in the said floor slab bridge. It is a perspective view which shows the lower surface structure (a formwork is included) of the said floor slab bridge. It is a perspective view of a formwork (with a hook). It is a top view of a formwork (without a hook). It is a side view of the hook attached to a formwork. (A) It is a perspective view which shows the lower surface structure (a formwork is included) of the conventional floor slab bridge. (B) It is sectional drawing which shows the lower surface structure (a formwork is included) of the conventional floor slab bridge.

Embodiments of the present invention will be specifically described below with reference to the drawings.
As shown in FIG. 1 and the like, in this embodiment (floor slab bridge 1), while supporting a plurality of bridge girders 2 on a concrete bridge pier 3, they are juxtaposed in the bridge width direction, and the side surfaces of the respective bridge girders 2 are arranged. A slab concrete 4 is cast and formed in the longitudinal direction of the bridge girder 2 between them, and a floor slab 5 comprising a composite structure of the bridge girder 2 and the slab concrete 4 is formed.

  1 and 2 show a single span floor slab bridge in which concrete piers 3 are respectively installed on the opposite bank of the river and both ends of the bridge girder 3 are supported on the concrete piers 4, and FIG. A multi-diameter floor slab bridge provided with a concrete bridge pier 4 supporting the middle of the length is shown, and the present invention is applied to the single-diameter inter-slab slab bridge and the multi-diameter inter-slab slab bridge.

  The bridge girder 2 is a steel girder or a concrete girder. As a preferred example, as shown in FIGS. 3 and 4, etc., an H-shaped steel having an upper flange 7 at the upper end of the abdominal plate 6 and a lower flange 8 at the lower end. The slab concrete 4 is formed by placing concrete in the space defined by the upper flange 7 and the lower flange 8 and the abdomen 6 between the bridge girder 2 adjacent in the width direction of the bridge, and the bridge girder 2 and the slab concrete 4 are formed. A floor slab 5 having a composite structure is formed.

  There is an upper opening 9 extending in the bridge length direction between the adjacent upper flanges 7, and the lower opening 10 extending in the bridge length direction between the adjacent lower flanges 8 is closed by a closing member which will be described later to be the upper opening. 9, concrete is placed in the above-described space, that is, the concrete is stuffed to form the slab concrete 4.

  As described above, the floor slab bridge 1 is a concrete bridge pier 3 that supports the bridge girder 2 while placing the slab concrete 4 in the longitudinal direction of the bridge girder 2 between the side faces of the bridge girder 2 made of H-shaped steel arranged in parallel in the bridge width direction. The connecting concrete 12 that embeds the bridge girder portion 11 supported on the bridge seat surface is added and the slab concrete 4 and the concrete pier 3 are concretely connected via the connecting concrete 12. The floor slab bridge 1 includes a connecting rod 14 embedded in a concrete pier 3 and protruding upward from a bridge seat surface 13 of the pier. The protruding portion of the connecting rod 14 is inserted into the bridge girder portion 11 and penetrates the bridge girder portion 11. A stopper is provided on the upper end protruding portion of the inserted connecting rod 14. The stopper is configured by sitting on the upper surface of the bridge girder portion 11 and connecting each bridge girder 2 to the concrete pier 3.

  As shown in FIG. 7, a mold 15 for closing the lower opening 10 is disposed on the lower surface of the floor slab bridge 1. The mold 15 is formed of a rectangular plate-shaped plastic concrete, and is placed on the lower flange 8 that is a flange portion of the bridge girder (H-shaped steel) 2. The mold 15 is left without being removed after the slab concrete 4 is formed.

  As shown in FIG. 8, a hook 16 is provided on the upper surface of the mold 15. The hook 16 is hooked on the belly bar 17 which is a basic reinforcing bar when the mold 15 is arranged. As shown in FIG. 9, fixing nuts 18 for attaching the hooks 16 to the upper surface are embedded in the four corners on the upper surface of the mold 15 in advance. The hook 16 is screwed on the fixing nut 18 at the construction site so that the hook 16 can be easily attached without being disturbed during transportation. Further, as shown in FIG. 10, the hook 16 is preferably divided at the center, and this divided portion is connected by a length adjusting nut 19. The length adjusting nut 19 rotates to change the screwing length, and the length of the hook 16 protruding from the mold 15 can be adjusted. By adjusting the length adjusting nut 19, as shown in FIG. 7, the hook 16 of the mold 15 placed on the lower flange 8 can be hooked on the belly bar 17 at an optimal position.

  The mold 15 is preferably made of resin concrete, among plastic concrete. According to the resin concrete, high mechanical strength and high chemical resistance with excellent acid resistance can be obtained. Moreover, it is preferable that resin concrete is what put the linear reinforcement 20 (refer FIG. 8) or a fiber material.

  In addition, in the part facing the bridge seat surface 13 of the concrete bridge pier 3 of the bridge girder part 11 where the connecting concrete 12 is placed, the bridge girder 2 is not closed without closing the lower opening 10 between the bridge girder 2 as shown in FIG. Concrete is cast in the interspace to form the slab concrete 15, and at the same time, a part of the concrete flows out to the bridge seat surface 13 through the lower opening 10 and is combined with the bridge seat surface 13.

  At the same time, the roadbed concrete 21 integrally joined through the upper openings 9 is formed on the upper flanges 7 of all the bridge girders 2, and the road pavement 22 is applied to the upper surface of the roadbed concrete 21.

  A first vertical reinforcing bar 23 extending in the bridge length direction and a horizontal reinforcing bar 24 extending in the bridge width direction are braided on the roadbed concrete 21, that is, the first vertical reinforcing bar 23 and the horizontal reinforcing bar 23 are installed on the upper flange 7. The rebar 24 is braided and loaded on the upper flange 7, and the suspended rebar 26 braided on the horizontal rebar 24 or the first vertical rebar 23 is suspended and embedded in the slab concrete 4 through the upper opening 9. .

  As an example of the suspended reinforcing bar 25, as shown in FIG. 6, the reinforcing bar 20 is bent into a U shape, and both arms are assembled to the horizontal reinforcing bar 24. Further, a U-shaped suspended reinforcing bar 26 in which the reinforcing bar 20 is bent in an inverted U shape is formed, and a connecting portion of the U-shaped suspended reinforcing bar 26 is assembled to the first longitudinal reinforcing bar 23 or the horizontal reinforcing bar 24, The arm is inserted into at least the upper flange 7 of the bridge girder 2 and embedded in the slab concrete 4.

  The suspended reinforcing bar 25 or the U-shaped suspended reinforcing bar 26 is assembled with a second longitudinal reinforcing bar 27 (see FIG. 6) and embedded in the slab concrete 4 and penetrates all the abdominal plates 6 in the bridge width direction. An insertable belly rod 17 is embedded in the slab concrete 4.

  In other words, the bridge girder 2 made of H-shaped steel (T-shaped steel or I-shaped steel), various concrete bridge girders, etc. are used to form a space for placing concrete between each bridge girder 2 and between the upper ends of adjacent bridge girders 2 The upper opening 9 is formed, and concrete is placed in the above-described space through the upper opening 9, that is, the slab concrete 4 is formed by stuffing, and at the same time, the upper openings 9 are formed on the upper surfaces of all the bridge girders 2. The roadbed concrete 21 integrally joined is cast and formed, and the road pavement 22 is applied to the upper surface of the roadbed concrete 21. The first vertical reinforcing bar 23 and the horizontal reinforcing bar 24 loaded on the upper end surfaces of all bridge girders 2 are embedded inside the roadbed concrete 21, and the suspended reinforcing bar 25 and the U-shaped reinforcing bar 26 are connected to the slab concrete 4. The slab concrete 4 is embedded in the slab concrete 4 while burying in the interior of the slab concrete.

  A large number of suspension reinforcing bars 25, U-shaped suspension reinforcing bars 26, horizontal reinforcing bars 24 and abdominal threading bars 17 are arranged at intervals in the bridge length direction, and the first vertical reinforcing bars 23 and the second vertical reinforcing bars 27 are arranged. Of course, a large number of are arranged at intervals in the bridge width direction.

  Moreover, the connecting concrete 12 which embed | buries the bridge girder part 11 supported by this bridge seat surface 13 on the bridge seat surface 13 of the concrete bridge pier 3 which supports the lower end surface of the bridge girder 2 is increased, as shown in FIG. In addition, the slab concrete 4 and the concrete pier 3 are connected to each other through the connecting concrete 12, and the bridge girder 2 is connected to the concrete pier 3 through the slab concrete 4 and the connecting concrete 12. Configure.

  That is, after the concrete pier 3 is constructed, the lower end surface of the bridge girder 2 is supported on the bridge seat surface 13, and in the case of the bridge girder 2 made of H-shaped steel, the lower flange 8 is supported on the bridge seat surface 13, The connecting concrete 12 is cast and formed on the bridge seat surface 13.

  As shown in FIG. 2, the connecting concrete 12 makes the concrete bridge pier 3 substantially bulky, and in the case of the bridge girder 2 made of H-shaped steel, the upper surface of the upper flange 7 is connected to the upper surface of the connecting concrete 12. Covering with the top portion 28, that is, burying the upper end portion (upper flange 7) of the bridge girder 2 in the top portion 28 of the connecting concrete 12, and the concrete connection with the slab concrete 4 through the upper opening 9 of the bridge girder 2. The top portion 28 of the connecting concrete 12 constitutes a part of the roadbed concrete 21.

  In addition, as shown in FIG. 2, the bridge girder 2 end face of the bridge long end is covered with the rear side part 29 of the connecting concrete 12, that is, the bridge girder 2 end face is embedded inside the rear side part 29, The concrete is combined with the slab concrete 4 through the opening. The slab concrete 4 of the bridge girder portion 11 constitutes a part of the connecting concrete 12.

  Further, the outer side surface of the bridge girder portion 11 in the bridge width direction is covered with the left and right side portions 30 of the connecting concrete 12 in the bridge width direction. That is, the outer surface is embedded in the left and right side portions 30.

  Therefore, the connecting concrete 12 is made to have a structure in which the above-described composite structure floor slab 5 is cross-linked.

  In this embodiment, as shown in FIGS. 1 and 2, in this embodiment, a retaining wall that is coupled in the width direction of the bridge is constructed by striking the sheet pile 31 while facing the shore, and on the water surface or the ground. The concrete bridge pier 3 is supported on the upper end of the sheet pile 31 protruding upward, the concrete bridge pier 3 and the slab concrete 4 are concretely connected (rigidly connected) with the connecting concrete 12, and the bridge girder 2 is connected to the slab concrete 4. A portal ramen structure that is rigidly connected to the concrete pier 3 through the connecting concrete 12 is constructed.

  As shown in the figure, a sheet pile 31 made of a steel plate having joints on both side edges is used as a sheet pile, and a large number of sheet piles 31 are driven with joints to form a sheet pile foundation and a retaining wall, and a concrete pier is formed at the upper end thereof. 3 is supported.

  Alternatively, a large number of sheet piles 31 made of steel pipe columns or concrete columns are driven to form a sheet pile foundation and a retaining wall, and a concrete pier 3 is supported on the upper end thereof.

  The bridge girder 2 is supported directly on the bridge seat surface 13 of the concrete pier 3 or a pillow material 32 is provided on the bridge seat surface 13 and the bridge girder 2 is supported on the pillow material 32, that is, the bridge seat surface 13. The bridge girder 2 is indirectly supported via the pillow material 32 and the pillow material 32 is embedded in the connecting concrete 12.

  More specifically, the concrete cast through the upper opening 9 is filled in the space between the bridge beams 2 to form the slab concrete 4 and simultaneously flows out onto the bridge seat surface 13 through the lower opening 10 and is made of slab concrete 4 and concrete. The pier 3 is concrete-bonded.

  Therefore, the connecting concrete 12 cast and formed in the bridge girder portion 11 on the concrete pier 3 constitutes a part of the slab concrete 4.

  By interposing the pillow material 32, a space is formed between the floor slab 5 and the bridge seat surface 13, and the space is filled with the connecting concrete 12 through the lower opening 10 to be combined with the bridge seat surface 13 and in the space. The bottom surface 33 of the connecting concrete 12 filled with the bottom surface of the bridge girder portion 11 (the bottom surface of the lower flange 8 in the case of the bridge girder 2 made of H-shaped steel) is covered. That is, the lower flange 8 is embedded in the bottom 33 of the connecting concrete 12 and at the same time, the pillow material 32 is embedded in the bottom 33 of the connecting concrete 12.

  Even when the pillow material 32 is not interposed, a part of the slab concrete 4 flows out from the lower opening 10 to the bridge seat surface 13 and is concretely bonded to the bridge seat surface 13.

  As the pillow 32, a pillow 32 made of H-shaped steel or a pillow 32 made of concrete is used. As a preferred example, a pillow material 32 integrally formed with the concrete pier 3 is provided from substantially the center of the bridge seat surface 13.

  Moreover, the pillow 32 is provided independently for each bridge girder 2, and is provided with a pillow 32 extending continuously in the bridge width direction. For example, the pillow 32 extending continuously in the bridge width direction is made of concrete. Set sideways with the pier 3

  In the case of the bridge girder 2 made of H-shaped steel, the lower flange 8 is supported directly on the bridge seat surface 13 of the concrete pier 3 or on the concrete pillow 32 provided on the bridge seat surface 13. 8, that is, the bridge girder 2 made of H-shaped steel is indirectly supported on the bridge seat surface 13 via the pillow material 32, and the pillow material 32 is embedded in the bottom 33 of the connecting concrete 12.

  That is, the space between the floor slab 5 formed by the pillow material 32 and the bridge seat surface 13, in other words, the space between the lower flange 8 of the bridge girder 2 made of H-shaped steel and the bridge seat surface 13 is connected through the lower opening 10. The concrete 12 is filled to be concrete-bonded to the bridge seat surface 13, and at the bottom 33 of the connecting concrete 12 filled in the space, the bottom surface of the bridge girder portion 11 (the lower flange 8 in the case of the bridge girder 2 made of H-shaped steel). Cover the lower surface). That is, the lower flange 8 is embedded in the bottom 33 of the connecting concrete 12 and at the same time, the pillow material 32 is embedded in the bottom 33 of the connecting concrete 12.

  Similarly, when a bridge girder made of T-type steel or I-type steel or a bridge girder made of various concrete is used as the bridge girder 2, the lower end surface of each bridge girder 2 is directly supported on the bridge seat surface 13 of the concrete pier 3; The lower end surface of the bridge girder 2 is supported on the pillow material 32 provided on the bridge seat surface 13, that is, the bridge girder 2 is indirectly supported on the bridge seat surface 13 via the pillow material 32, and the concrete is passed through the lower opening 10. The space 32 is filled and a pillow 32 is embedded in the bottom 33 of the connecting concrete 12.

  Further, as a means for strengthening the concrete connection structure by the connecting concrete 12, that is, the rigid connection structure, the bridge girder portion 11 and the concrete supported by the bridge seat surface 13 of the concrete bridge pier 3 and embedded in the connecting concrete 12. The bridge piers 3 are connected by connecting rods 14 made of connecting wires or connecting pipes embedded in the concrete piers 3 and the connecting concrete 12. The connecting rod 14 cooperates with the connecting concrete 12 to form a rigid connection structure.

  The connecting rod 14 extends in the vertical direction over substantially the entire height of the concrete pier 3 and protrudes upward from the bridge seat surface 13, and the protruding portion corresponds to the bridge girder portion 11, the slab concrete 4, or both. It connects to the concrete pier 3 through the part to make.

  For example, when the bridge girder 2 is made of H-shaped steel, the protruding portion of the connecting rod 14 is inserted into a through hole provided in the lower flange 8 and the upper flange 7, and the male thread portion of the connecting rod 14 protruding from the upper surface of the upper flange 7. The nut 34 is screwed to the upper flange 7 and the bridge girder portion 11 is connected to the concrete pier 3.

  Similarly, when a bridge girder made of T-type steel or I-type steel or a bridge girder made of various concrete is used as the bridge girder 2, the upper end protruding portion of the connecting rod 14 is inserted into the upper flange 7 or the girder body, which is a stopper. The upper flange 7 and the bridge girder 2 are seated with a nut 34 or the like.

  As shown in FIG. 5, an elongated seat plate 35 extending in the bridge width direction is installed on the upper surface of the bridge girder 2 (the upper surface of the upper flange 7 in the case of a bridge girder made of H-shaped steel), and a through hole provided in the seat plate 35. Then, the upper end protruding portion of the connecting rod 14 is inserted, and the nut 34 is screwed onto the upper end protruding portion (male thread portion) on the upper surface of the seat plate 35, and is seated on the seat plate 35.

  In addition, a part of the connecting rod 14 passes through a portion corresponding to the slab concrete 4 of the connecting concrete 12 and protrudes upward through the upper opening 9, and the upper end protruding portion of the connecting rod 14 is a through hole provided in the seat plate 35. The nut 34 is screwed into the upper end protruding portion (male thread portion) on the upper surface of the seat plate 35 and seated on the seat plate 35.

  As shown in FIG. 1, the connecting rod 14 specifically includes, for example, two connecting rods 14 which are formed by bending a reinforcing bar 20 into a U shape and connected to each other, and each connecting rod 14 is connected to a concrete pier 3. The upper end is embedded in the connecting concrete 12 and is connected to the bridge girder portion 11.

  In addition, there are a configuration in which a plurality of separated connecting rods are used, and each connecting rod is embedded in the concrete pier 3 in the vertical direction, and the upper end is embedded in the connecting concrete 12 and connected to the bridge girder portion 11. is there.

  As shown in FIG. 1, when the concrete pier 3 is supported on the upper end of the sheet pile 31, the upper end of the sheet pile 31 penetrates between two connecting rods 14 bent and connected in a U shape. The reinforcing sheet 36 for connecting sheet piles is assembled, and the connecting rod 14 and the upper end of the sheet pile 31 are firmly connected via concrete. That is, the concrete bridge pier 3 is firmly connected to the upper end of the sheet pile 31 by the connecting rod 14 and the sheet pile connecting rebar 36.

  Of course, a plurality of connecting rods 14 and sheet pile connecting rebars 36 are arranged in the bridge width direction.

  The slab concrete 4 in the embodiment described above is a case where the concrete is filled into the entire space volume between the adjacent bridge girders 2, that is, the entire space volume between the side surfaces of the bridge girder 2 and is integrally cast with the roadbed concrete 21. Indicated.

  As another example, the lower space in which the slab concrete 4 extending in the bridge length direction is cast only in the upper space of the space between the bridge girders 2 and the lower space is left in the bridge length direction without placing concrete in the lower space. And filling with a lightweight material such as foam. In any case, the slab concrete 4 is continuous between the spans between the concrete piers 3 and is integrally connected to the connecting concrete 12 at both ends thereof.

  For example, when the bridge girder 2 is made of H-shaped steel, the slab concrete 4 is densely filled between the upper flange 7 and the lower flange 8, or the slab concrete 4 is filled from the upper flange 7 to the upper part of the belly plate 6. The upper base 7 is embedded in the slab concrete 4 and the subbase concrete 21 while the lower flange 8 and the lower part of the belly plate 6 are exposed from the slab concrete 4 so that the upper flange 7 That is, the lower space is left below the slab concrete 4 over the bridge length direction.

  Even when the slab concrete 4 is cast and formed in the upper space between the bridge girders 2 and the lower space is left, the connected concrete 12 is placed on the bridge seat surface 13 at the site where the connected concrete 12 is cast and formed. 12 is filled in the entire space between the bridge girders 2, and a part of the connecting concrete 12 flows out onto the bridge seat surface 13 through the lower opening 10 and is bonded to the concrete.

  In the best mode for carrying out the present invention, the term “concrete pier 3” collectively refers to an abutment and a pier.

  From here, the effect | action in the floor slab bridge 1 is demonstrated. The floor slab bridge 1 has conventionally used cedar, so that it is not placed on the flange portion of the steel material (specifically, the lower flange 8 such as H-shaped steel) but fitted between the lower flanges 8. The frame is made of plastic concrete (resin concrete), and can be arranged by placing both sides on the lower flange 8. This is because when the mold is made of cedar, the mold is not regarded as concrete and cannot be placed on the lower flange 8. In the present invention, the mold 15 placed on the lower flange 8 and closing the lower opening 10 between the bridge girders 2 is used to form the slab concrete 4 and then removed as it is as a part of the slab concrete 4. It can be left without. Therefore, in the floor slab bridge 1, since the mold 15 made of plastic concrete hardly deteriorates over time, it does not rot and fall like cedar.

  Further, in the floor slab bridge 1, a basic reinforcing bar (abdominal threading rod) 17 constituting a part of the bridge beam 2 is penetrated through a bridge girder 2 made of H-shaped steel, and a hook 16 is hooked on the abdominal threading rod 17. Compared to the case where the frame 15 is supported and simply placed on the lower flange 8, the mold 15 does not fall more. Further, when the concrete is placed, it is prevented from being moved by the flowing concrete and moving the mold 15. Thereby, since the mold 15 is held in a suspended state, the mold 15 can be more reliably prevented from dropping.

  Furthermore, resin concrete which is a kind of plastic concrete is used for the formwork 15, and bending strength, tensile strength, compressive strength, abrasion resistance and acid resistance are further enhanced. Resin concrete uses aggregates such as sand and gravel as binders such as thermosetting resins such as unsaturated polyester resins, and is cured by a polymerization reaction between the resin and catalyst, enabling compact and high-strength molding. Become. Further, since the mechanical strength is high, a substantial weight reduction is possible. Thereby, since resin concrete has several times the intensity | strength of cement concrete, the intensity | strength and durability of the formwork 15 can be improved further.

  Further, the tenacity (toughness) and tensile strength of the linear reinforcing bar 20 and the fiber material, which are difficult to break, and the high compressive strength of the resin concrete integrated with the aggregate are obtained together, and the components are complemented. Higher mechanical strength. Thereby, the intensity | strength of the formwork 15 can further be raised.

  Therefore, according to the above-described embodiment (floor slab bridge 1), the formwork 15 is integrated with the bridge, hardly deteriorates, and the strength and durability can be improved.

1 ... Floor slab bridge 2 ... Bridge girder (H-shaped steel)
3 ... Concrete bridge pier 4 ... Slab concrete 8 ... Lower flange (of the bridge girder) 11 ... Bridge girder part 12 ... Concrete concrete 13 ... Bridge seat 14 ... Connecting bar 15 ... Formwork 16 ... Hook 17 ... Base reinforcement (belly bar) )
20 ... Rebar (Linear Rebar)

Claims (4)

Connected concrete in which slab concrete is placed between the sides of each bridge girder arranged in parallel in the bridge width direction over the longitudinal direction of the bridge girder, and the bridge girder portion supported on the bridge seat surface of the concrete pier supporting the bridge girder is embedded. The slab concrete and the concrete pier are concretely coupled via the connecting concrete, and are connected to the concrete pier so as to protrude upward from the bridge seat surface. A rod is inserted into the bridge girder portion, and an upper end protruding portion of the coupling rod inserted into the bridge girder portion is seated on the upper surface of the bridge girder portion, and each bridge girder is fixed to the concrete bridge pier. In the floor slab bridge connected to
The bridge girder uses a steel material having a flange portion at a lower portion, and a plate-like formwork disposed on the lower surface of the floor slab bridge is placed between the upper surfaces of the flange portions so as to close between the bridge girders. This is a floor slab bridge. Hooks provided on the upper surface of the plate-like mold, the floor slab bridge according to claim 1, wherein said hook is characterized in that it is hooked to the underlying reinforcement when the mold is disposed. The floor slab bridge according to claim 1 or 2, wherein the plate- shaped formwork is made of concrete plate material, plastic concrete, or resin concrete. The floor slab bridge according to claim 1 or 2, wherein the plate- shaped formwork is a concrete in which a reinforcing bar or a fiber material is put into concrete .