JP4359697B2 - Ramen bridge structure - Google Patents

Description

  The present invention relates to a ramen bridge structure in which a bridge pier (including an abutment) and a bridge girder are rigidly connected in a girder bridge or a floor slab bridge.

  A conventional floor slab bridge has 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 bearing absorbs expansion, contraction, or twisting of the bridge girder.

  However, in the above-mentioned flexible structure, there is a risk of falling over a severe earthquake, and in addition, the rubber bearing has a problem that the function is deteriorated due to deterioration with age, and particularly, it is very expensive and increases the construction cost.

On the other hand, Patent Document 1 supports a bridge girder on a bridge seat surface of a concrete bridge pier without using the rubber bearing as a method of replacing the flexible coupling structure by the rubber bearing, and a concrete bridge pier on the bridge seat surface. We have proposed a construction method in which the connecting concrete that embeds the supported bridge girder is reinforced, and the bridge girder and the pier are rigidly connected to each pier via independent connecting concrete.
JP 2000-319816 A

  However, it is difficult to secure the strength of the independent connecting concrete itself against expansion and contraction or torsion of the bridge girder extending long between the bridge piers by the method of rigidly connecting via the independent connecting concrete that is struck for each concrete pier. Concentration of stress on the surface leads to cracks and the like, and there is a concern that it will not function effectively as a seismic structure against severe earthquakes.

  On the other hand, the present invention arranges a short reinforcing girder between the bridge girder portions supported on the bridge seat surfaces of a plurality of bridge piers, and further increases the connecting concrete integrally with the bridge piers on the bridge seat surface. The present invention provides a ramen bridge structure in which the bridge girder part and the short reinforcing girder are embedded in concrete.

  In the present invention, slab concrete is placed between the bridge girders in the bridge length direction to form a floor slab composed of a composite structure of the bridge girder and slab concrete, and a short reinforcement is provided between the bridge girders on the bridge seat surface. A girder is placed, and the connecting concrete that embeds the bridge girder portion supported on the bridge seat surface and the short reinforcing girder on the above-mentioned bridge seat surface is added, and the slab concrete and the bridge girder and the concrete pier are short reinforcing girder. The present invention provides a rigidly connected rigid frame bridge structure in which concrete is bonded via the above-mentioned connecting concrete in which a steel is embedded.

  A roadbed concrete covering the bridge girder and the short reinforcing girder is integrally formed on the upper surfaces of the slab concrete and the connecting concrete.

  The slab concrete, the connecting concrete and the roadbed concrete are formed by pouring at a time.

  Both ends of the short reinforcing girder have end portions extending in the bridge length direction from the bridge seat surface, and the extending ends are embedded in slab concrete or connected concrete.

  The above concrete piers are either built up on the underground foundation piles or built into the bridge walls in the direction of the bridge width by driving in with the sheet piles facing the river shore. The concrete bridge pier is supported on the upper end of the sheet pile projecting to the side, and a rigid connection structure is constructed in which the bridge pier and the slab concrete are connected with concrete by connecting concrete.

  The bridge girder and the short reinforcing girder are directly supported on the bridge seat surface of the concrete pier or indirectly supported via a pillow material on the bridge seat surface, and the bridge seat surface and the bridge girder formed by the pillow material. And the space between the short reinforcing girders is filled with the connecting concrete, and the pillow material is embedded in the connecting concrete together with the bridge girders and the short reinforcing girders.

  As the pillow material, a concrete pillow material cast and formed on the bridge seat surface of a concrete pier is used. Alternatively, a steel material or the like can be used.

In addition, as a means to reinforce the concrete bond by the connecting concrete, a connecting material is set up from the bridge pier between the bridge girder part supported by the bridge surface of the concrete pier and the concrete pier, and between the short reinforcing girder and the concrete pier. Connected with a connecting material that is raised and buried in the connecting concrete.
That is, the connecting material embedded in the concrete bridge pier protrudes upward from the bridge seat surface, the protruding portion is connected to the bridge girder portion, the bridge girder portion is connected to the bridge pier, and the above embedded in the concrete pier. Project another connecting material upward from the bridge seat surface, connect the projecting portion to the short reinforcing girder, connect the short reinforcing girder to the pier, and connect the connecting concrete integrally with the pier on the bridge seat surface. Further, the bridge girder part and the short reinforcing girder and the projecting portions of both the connecting members are embedded in the connecting concrete.

  In the present invention, the term pier is a generic term for an abutment and a pier.

  According to the present invention, the connecting concrete which is struck on the bridge seat surface of the pier and the short reinforcing girder disposed between the bridge girder portions on the bridge seat surface and embedded in the connecting concrete cooperate to have a rigid coupling degree. High portal ramen structure can be formed.

  That is, the rigid coupling on the bridge piers at both ends of the span can be greatly improved with respect to the vehicle load applied to the bridge girder between the spans of the floor slab bridge.

  In addition, it can effectively suppress the expansion, contraction, and twisting of the bridge girder, and can synergistically increase the strength of the connecting concrete itself against the expansion, contraction, twisting, etc., and is extremely effective as a measure to prevent falling bridges against severe earthquakes. .

  The best mode for carrying out the present invention will be described with reference to FIGS.

  As shown in FIG. 1 to FIG. 7, FIG. 9, FIG. 11, etc., a plurality of bridge girders 1 are arranged in parallel in the bridge width direction while being supported on the bridge seat surface 10 of a plurality of bridge piers 2, That is, the slab concrete 3 is cast and formed between the side surfaces of each bridge girder 1 in the bridge length direction, and the floor slab 4 composed of a composite structure of the bridge girder 1 and the slab concrete 3 is formed.

  FIG. 7 shows a single span floor slab bridge in which bridge piers 2 are respectively installed on opposite banks of the river and both ends of the bridge girder 1 are supported on the bridge seat surface 10 of the pier 2, and FIG. 9 shows the extension length of the bridge girder 1. 1 shows a double-diameter floor slab bridge provided with bridge piers 2 that support the middle of the present invention, and the present invention is effectively implemented in the single-diameter intermediate floor slab bridge and the multi-diameter floor slab bridge.

  The present invention can be effectively implemented for single-span girder bridges and multi-span girder bridges that do not have slab concrete.

  The bridge girder 1 uses a steel girder or a concrete girder. That is, it consists of steel girders such as H-shaped steel, T-shaped steel, I-shaped steel, channel-shaped steel, angle steel, etc., girder and box girder manufactured by welding steel plates, or concrete girder of similar form. .

  As a preferred example, as shown in FIGS. 5 and 11, etc., an H-shaped steel bridge girder 1 having an upper flange 1b at the upper end of the abdominal plate 1a and a lower flange 1c at the lower end is adjacent to the bridge width direction. A concrete slab concrete 3 is formed by placing concrete in a space between bridge girder 1, that is, a space defined by upper and lower flanges 1 b and 1 c and abdominal plate 1 a, and a floor composed of a composite structure of bridge girder 1 and slab concrete 3 Plate 4 is formed.

  There is an upper opening 5 extending in the bridge length direction between the adjacent bridge beams 1, that is, in the example shown, between the upper flanges 1 b, and a lower opening 5 ′ between adjacent bridge beams 1, ie, the lower flange in the example shown in the figure. The lower opening 5 'extending in the bridge length direction between the members 1c is closed with a closing member having a formwork function, and concrete is placed in the space through the upper opening 5, that is, the concrete is placed between the slab concrete 3 Form.

  At the same time, a roadbed concrete 6 covering the upper surface of the bridge girder 1 on the upper surface of the slab concrete 3, that is, covering the entire upper flange 1 b of the bridge girder 1 is cast and formed. The roadbed concrete 6 is integrally coupled to the slab concrete 3 through the upper opening 5, and road pavement 7 is applied to the upper surface of the roadbed concrete 6.

  The closing member for closing the lower opening 5 'is removed after the slab concrete 3 is formed or left as it is.

  On the other hand, as shown in FIGS. 1 to 5, a short reinforcing girder 21 is arranged in parallel with the bridge girder portion 1 'in the space between the bridge girder portions 1' supported on the bridge seat surface 10 of the pier 2 so that the bridge pedestal. Support on surface 10.

  As shown in FIGS. 1 and 2, in the case of a single-diameter floor slab bridge, both ends of the bridge girder 1 are supported on the bridge seat surface 10 of a pair of piers (abutments) 2 constructed on the riverbank, The short reinforcing beam 21 is arranged in parallel between the bridge beam portions 1 ′ supported on the bridge seat surface 10 and supported on the bridge seat surface 10. In this case, the inner end of the short reinforcing beam 21 is extended from the bridge seat surface 10 of the pier (abutment) 2 to form an extended end 21 ′.

  As shown in FIGS. 3 and 4, in the case of a multi-span span slab bridge, the intermediate length of the bridge girder 1 is supported on the bridge seat surface 10 of the intermediate pier 2 or the left span bridge girder. 1 and the end of the right span bridge girder 1 are supported on the bridge seat surface 10, and the short reinforcing girder 21 is parallel between the bridge girder portion 1 ′ supported on the bridge seat surface 10 of the intermediate pier 2. And is supported on the bridge seat surface 10. In this case, both ends of the short reinforcing beam 21 are extended from the bridge seat surface 10 of the intermediate pier 2 to form an extended end 21 '.

  The extended end 21 ′ of the short reinforcing beam 21 is embedded in the slab concrete 3 or the connecting concrete 11.

  The short reinforcing girder 21 is a steel girder or concrete girder, that is, a steel girder made of a shape steel such as H-shaped steel, T-shaped steel, I-shaped steel, groove-shaped steel, or angle steel, a girder manufactured by welding steel plates, and Use a box girder or a concrete girder of the same form.

  As shown in FIG. 5, when an H-shaped steel is used as the bridge girder 1 and an H-shaped steel is used as the short reinforcing girder 21, the upper opening 5 is between the upper flange 1 b of the bridge girder 1 and the upper flange 21 b of the short reinforcing girder 21. Similarly, the lower opening 5 ′ is formed between the lower flange 1 c of the bridge girder 1 and the lower flange 21 c of the short reinforcing girder 21.

  The lower opening 5 ′ facing the bridge seat surface 10 of the pier 2 is not closed by the closing member, and concrete is cast into the space between the bridge girder portion 1 ′ and the short reinforcing girder 21 through the upper opening 5 to connect concrete. At the same time, a part of the concrete flows out toward the bridge seat surface 10 through the lower opening 5 ′ and is combined with the bridge seat surface 10.

  In other words, the connecting concrete 11 is struck in a space defined by the upper and lower flanges 1b and 1c of the bridge girder 1 'and the abdomen 1a and the upper and lower flanges 21b and 21c and the abdomen 21a of the short reinforcing girder 21 adjacent thereto. Then, a part of the concrete is allowed to flow out toward the bridge seat surface 10 through the lower opening 5 ′, and the concrete is bonded to the bridge seat surface 10.

  On the upper surface of the connecting concrete 11, a roadbed concrete 6 covering the bridge girder portion 1 ′ and the short reinforcing girder 21, i.e., covering the upper flanges 1 b and 21 b of both 1 ′ and 21 is cast and formed. A road pavement 7 is applied to the upper surface of 6.

  The roadbed concrete 6 and the road pavement 7 are continuously and integrally formed on the upper surfaces of the slab concrete 3 and the connecting concrete 11.

  Moreover, it is preferable that the slab concrete 3, the roadbed concrete 6, and the connecting concrete 11 are integrally cast at the site, and it is not preferable that the three members 3, 6, and 11 are placed separately with time.

  As shown in FIG. 13, a vertical reinforcing bar 16 extending in the bridge length direction and a horizontal reinforcing bar 8 extending in the bridge width direction are braided in the roadbed concrete 6, that is, vertically provided on the upper flanges 1b and 21b. The reinforcing bar 16 and the horizontal reinforcing bar 8 are assembled and loaded on the upper flanges 1b and 21b, and the suspended reinforcing bar 9 braided on the horizontal reinforcing bar 8 or the vertical reinforcing bar 16 is connected to the upper opening 5 between the bridge girders 1. The slab concrete 3 and the connecting concrete 11 are respectively suspended and embedded through the upper opening 5 between the bridge girder portion 1 ′ and the short reinforcing girder 21.

  That is, after the reinforcing bars 8, 9, 16 are arranged, the slab concrete 3, the roadbed concrete 6, and the connecting concrete 11 are formed at a time, and the reinforcing bars 8, 9, 16 are embedded in the concrete 3, 6, 11. To do.

  As shown in FIG. 13 as an example, the suspended reinforcing bar 9 is formed by bending the reinforcing bar into a U-shape and braiding both arms to the horizontal reinforcing bar 8. Further, a suspended reinforcing bar 9 ′ formed by bending the reinforcing bar into an inverted U shape is formed, and a connecting portion of the suspended reinforcing bar 9 ′ is assembled to the vertical reinforcing bar 16 or the horizontal reinforcing bar 8.

  When the bridge girder 1 having the upper and lower flanges 1b, 1c, 21b, 21c typified by H-shaped steel is used as the bridge girder 1 or / and the short reinforcing girder 21, both arms of the inverted U-shaped suspended reinforcing bar 9 'are used. The bridge girder 1 and the short reinforcing girder 21 are inserted into at least the upper flanges 1 b and 21 b and embedded in the slab concrete 3 and the connecting concrete 11.

  A vertical reinforcing bar 16 'is braided in the suspended reinforcing bar 9 or 9' and embedded in the slab concrete 3, and all the abdominal plates 1a and 21a of the bridge girder 1 and the short reinforcing girder 21 can be inserted in the bridge width direction. The belly bar 17 is embedded in the slab concrete 3. As shown in FIGS. 2 and 4, both ends of the web threading rod 17 are fastened with nuts 22 on the outer side surface of the web 1 a of the bridge girder 1 at the parallel end.

  In other words, a concrete placement space is formed between the bridge girders 1, and a concrete placement space is formed between the bridge girder portion 1 ′ on the bridge seat surface 10 and the short reinforcing girder 21, and between the upper ends of the adjacent bridge girders 1. An upper opening 5 is formed between the adjacent bridge girder portion 1 ′ and the short reinforcing girder 21, and concrete is placed in the space through the upper opening 5, that is, the concrete is stuffed, and the slab concrete 3 and the connecting concrete are inserted. At the same time, the roadbed concrete 6 is cast and formed on the upper surfaces of the slab concrete 3 and the connecting concrete 11, and the roadbed concrete 6 covers the upper surfaces of all the bridge girders 1 and all the short reinforcing girders 21. 6 is integrated with the slab concrete 3 and the connecting concrete 11 through the upper opening 5.

  A road pavement 7 is applied to the upper surface of the roadbed concrete 6. In the roadbed concrete 6, vertical reinforcing bars 16 and horizontal reinforcing bars 8 loaded on the upper end surfaces of all bridge girders 1 and all short reinforcing girders 21 are embedded, and the suspended reinforcing bars 9, 9 'are embedded in the slab concrete 3. The slab concrete 17 is embedded in the slab concrete 3 so as to penetrate the entire bridge girder 1 and the abdominal plates 1a and 21a of the short reinforcing girder 21 in the bridge width direction.

  The suspension rebars 9 and 9 ', the horizontal rebars 8 and the abdominal bars 17 are arranged at intervals in the bridge length direction, and the vertical rebars 16 and 16' are arranged at intervals in the bridge width direction. Of course

  As described above, the bridge girder portion 1 ′ and the short reinforcing girder 21 supported by the bridge seat surface 10 are provided on the bridge seat surface 10 of the concrete bridge pier 2 that supports the lower ends of the bridge girder 1 and the short reinforcing girder 21. As shown in FIGS. 8 and 10 and the like, the slab concrete 3 and the roadbed concrete 6 and the concrete bridge pier 2 are concretely joined via the connection concrete 11 as shown in FIGS. A portal ramen structure or a double span portal ramen structure is formed.

  1 and 3, the connecting concrete 11 makes the concrete pier 2 substantially bulky, and the upper surface of the bridge girder portion 1 'and the upper surface of the short reinforcing girder 21, that is, both 1' and 21 are H-shaped steel. When it is made, the upper surfaces of the upper flanges 1b and 21b are covered with the top 11a of the connecting concrete 11, and the top 11a constitutes a part of the roadbed concrete 6.

  Further, as clearly shown in FIGS. 1, 3, 5, etc., the bridge girder 1 end face and the end face of the short reinforcing girder 21 are covered with the rear side portion 11b of the connecting concrete 11, that is, the bridge girder 1 end face and the short reinforcing girder. The end face 21 is embedded in the rear side part 11 b and is concretely connected to the slab concrete 3 through the end openings of both 1 and 21. The slab concrete 3 of the bridge girder portion 1 ′ constitutes a part of the connecting concrete 11.

  Further, the outer side surface of the bridge girder portion 1 ′ in the bridge width direction is covered with the left and right side portions 11 d of the connecting concrete 11 in the bridge width direction. That is, the outer surface is embedded in the left and right side portion 11d.

  Therefore, a structure is formed in which the connecting concretes 11 are cross-linked by the composite structure floor slab 4.

  Although the above explanation explained the case where the ramen bridge structure is used in the floor slab bridge, the present invention includes the case where the ramen bridge structure is used in the girder bridge.

  That is, as shown in FIG. 12, without connecting the slab concrete 3 between the bridge girders 1, the connecting concrete 11 is cast on the bridge seat surface 10 of the pier 2, and the bridge girder portion is formed in the connecting concrete 11. 1 'and the short reinforcement girder 21 are embedded. As a result, the bridge girder 1 is rigidly connected to the pier 2 via the connecting concrete 11 and the short reinforcing girder 21 at both ends of the span length and in addition via the connecting member 14.

  As shown in FIG. 9, the concrete pier 2 is raised on an underground foundation pile 18. Alternatively, as shown in FIG. 7, the earth retaining wall that is coupled in the bridge width direction is constructed by facing the riverbank while using the sheet pile 12 as a hand, and the upper end of the sheet pile 12 protruding on the water surface or the ground is formed. The concrete pier 2 is supported. Alternatively, a large number of steel pipe piles or concrete piles are driven in, and the concrete bridge pier 2 is supported on the upper end thereof.

  The pillow 13 is made of concrete integrally cast on the bridge seat surface 10 of the pier 2. Alternatively, a concrete pillow 13 and a steel pillow 13 such as H-shaped steel are installed on the bridge seat surface 10. That is, it is simply placed or fixed to the bridge seat surface 10 with bolts or the like.

  By interposing the pillow 13, a space is formed between the floor slab 4 and the bridge seat surface 10. The connecting concrete 11 is filled in the space through the lower opening 5 ′ and is connected to the bridge seat surface 10. The bottom portion 11c of the connecting concrete 11 filled in the space covers the lower face of the bridge girder portion 1 'and the short reinforcing girder 21, that is, both 1, 21 cover the lower faces of the lower flanges 1c, 21c. At the same time as embedding, the pillow material 13 is embedded in the bottom 11 c of the connecting concrete 11.

  Even when the pillow material 13 is not interposed, a part of the slab concrete 3 flows out from the lower opening 5 ′ to the bridge seat surface 10 and is bonded to the bridge seat surface 10.

  The pillow 13 is provided independently for each bridge girder 1 and short reinforcing girder 21 and is provided with a pillow 13 extending continuously in the bridge width direction, for example, a concrete pillow extending continuously in the bridge width direction. The material 13 is installed on the bridge seat surface 10 of the concrete pier 2 to support the bridge girder 1 and the short reinforcing girder 21.

  That is, the space between the floor slab 4 formed by the pillow material 13 and the bridge seat surface 10, in other words, a steel girder made of a shape steel such as an H-shaped steel, a T-shaped steel, an I-shaped steel, a grooved steel, or an angle steel. Alternatively, the space between the lower flange 1c of the bridge girder 1 such as a concrete girder and the bridge seat surface 10 is filled with the connecting concrete 11 through the lower opening 5 ', and at the same time, H-shaped steel, T-shaped steel, I-shaped steel, groove The connecting concrete 11 is connected to the space between the lower flange 21c of the short reinforcing girder 21 made of a shape steel such as a shape steel and an angle steel, or the short reinforcing girder 21 made of a similar concrete girder and the bridge seat surface 10 through the lower opening 5 '. Filling and concrete-bonding with the bridge seat surface 10, the bottom portion 11 c of the connecting concrete 11 filled in the space covers the lower surface of the bridge girder portion 1 ′ and the short reinforcing beam 21, that is, the lower surfaces of the lower flanges 1 c and 21 c. Therefore, the lower flanges 1 c and 21 c are embedded in the bottom portion 11 c of the connecting concrete 11, and at the same time, the pillow material 13 is embedded in the bottom portion 11 c of the connecting concrete 11.

  Further, as shown in FIG. 6 and the like, as means for reinforcing the concrete connection structure by the connecting concrete 11, that is, the rigid connection structure, the bridge girder portion 1 'on the bridge seat surface 10 of the concrete pier 2 and the short reinforcing girder 21 are provided. The concrete bridge piers 2 are connected by a large number of connecting members 14 made of a rod such as a reinforcing bar, a wire such as a wire or a pipe, or a channel member such as an L shape or a groove. The connecting material 14 cooperates with the connecting concrete 11 to improve the above-described rigid coupling degree.

The connecting member 14 extends in the vertical direction over substantially the entire height of the concrete pier 2 and is embedded in the connecting concrete 11 with its upper end protruding upward from the bridge seat surface 10. The bridge girder portion 1 'and the short reinforcing girder 21 are connected to each other.
That is, the connecting member 14 embedded in the concrete pier 2 protrudes upward from the bridge seat surface 10, the protruding portion is connected to the bridge girder portion 1 ′, the bridge girder portion 1 ′ is connected to the pier 2, and A connecting member 14 different from the connecting member 14 embedded in the concrete pier 2 protrudes upward from the bridge seat surface 10, and the protruding portion is connected to the short reinforcing girder 21 so that the short reinforcing girder 21 becomes the pier 2. The connecting concrete 11 is integrally beaten with the pier 2 on the bridge seat surface 10, and the bridge girder portion 1 ′, the short reinforcing girder 21, and the protruding portions of the both connecting members 14 are formed in the connecting concrete 11. Buried.

  For example, the bridge girder 1 and the short reinforcing girder 21 are formed of H-shaped steel, and the upper end protruding portion of the connecting member 14 is inserted into the through holes provided in the lower flanges 1c and 21c and the upper flanges 1b and 21b, and the upper flange 1b, A nut 15 is screwed into the male thread portion of the connecting member 14 projecting from the upper surface of 21b, and the nut 15 is fastened to the upper surfaces of the upper flanges 1b and 21b to connect the bridge girder portion 1 'and the short reinforcing girder 21 to the pier 2 respectively. .

  Similarly, when using steel beams such as T-shaped steel and I-shaped steel, and various types of concrete girders as the bridge girder 1 and short reinforcing girder 21, the flange, girder body, and short reinforcing girder body are used. The upper end protruding portion of the connecting member 14 is inserted and fastened with a nut 15 or the like.

  As shown in FIGS. 2, 4, 7, and the like, an elongated seat plate 20 extending in the bridge width direction is provided on the upper surfaces of the bridge girder 1 and the short reinforcing girder 21, and in the case of H-shaped steel, on the upper surfaces of the upper flanges 1 b and 21 b. The upper end protruding portion of the connecting member 14 is inserted into a through hole provided in the elongated seat plate 20, and a nut 15 is screwed and fastened to the upper end protruding portion (male screw portion) on the upper surface of the seat plate 20.

  As the seat plate 20, a metal groove channel, L-shaped channel, flat strip plate, or the like is used.

  In addition, a part of the connecting material 14 ′ penetrates through the connecting concrete 11 and protrudes upward through the upper opening 5, and the upper end protruding portion of the connecting material 14 ′ is inserted into the through hole provided in the elongated seat plate 20. A nut 15 is screwed onto the upper end protruding portion (male thread portion) on the upper surface of 20 and fastened.

  FIG. 7 shows a specific example of the connecting material 14. For example, a reinforcing bar is bent into a U shape to form a connecting member 14 that is connected to each other, and the connecting member 14 is embedded in the concrete bridge pier 2 in the vertical direction and the upper end of the connecting member 14 is embedded in the connecting concrete 11. 1 'and the short reinforcing beam 21 are connected.

  Alternatively, as illustrated in FIG. 9, a plurality of connecting members 14 having a bent portion at the lower end are used, and each connecting member 14 is embedded in the concrete pier 2 in the vertical direction, and the upper end is embedded in the connecting concrete 11. However, the bridge girder portion 1 ′ and the short reinforcing girder 21 are connected to each other.

  As shown in FIG. 7, when supporting the concrete bridge pier 2 to the upper end of the sheet pile 12, the sheet pile connection through which the upper end of the sheet pile 12 passes between the two connecting members 14 bent and connected in the U-shape. The reinforcing bars 19 are braided, and the connecting member 14 and the upper end of the sheet pile 12 are firmly connected via concrete. That is, the concrete pier 2 is firmly connected to the upper end of the sheet pile 12 by the connecting member 14 and the sheet pile connecting reinforcing bar 19.

  Of course, a plurality of the connecting members 14 and the sheet pile connecting rebars 19 are arranged in the bridge width direction.

  The slab concrete 3 in the floor slab bridge is shown in the case where the entire space of the space between the bridge girders 1 is filled with concrete and is integrally cast with the roadbed concrete 6.

  As another example, the slab concrete 3 extending in the bridge length direction is formed only in the upper space of the space between the bridge girders 1 and the lower space is extended in the bridge length direction without placing concrete in the lower space. It does not prevent it from remaining or filling the lower space with a lightweight material such as foam. In any case, the slab concrete 3 is continuous between the spans of the bridge piers 2 and is integrally connected to the connecting concrete 11 at both ends thereof.

  For example, when an H-shaped steel bridge girder is used as the bridge girder 1, the slab concrete 3 is closely filled between the upper flange 1b and the lower flange 1c, or the slab concrete 3 is filled from the upper flange 1b to the upper part of the web 1a. At the same time, the roadbed concrete 6 is integrally cast, and the upper flange 1b is embedded in the slab concrete 3 and the roadbed concrete 6, while the lower flange 1c and the lower part of the belly plate 1a are exposed from the slab concrete 3, and on the lower flange 1c, that is, slab concrete. A lower space extending in the bridge length direction is left below 3.

  Even when the slab concrete 3 is cast and formed in the upper space between the bridge girders 1 and the lower space is left, the same is applied to the portion where the connecting concrete 11 is cast, that is, the portion on the bridge seat surface 10. The concrete 11 is filled in the entire space between the bridge girder 1 and the short reinforcing girder 21, and a part of the concrete 11 is allowed to flow out onto the bridge seat surface 10 through the lower opening 5 ′ to be combined with the concrete.

The bridge length direction sectional view which shows the connection concrete and connection material which embed the bridge girder part and short reinforcement girder on the concrete pier (abutment) of a riverbank. The top view which abbreviate | omits connection concrete and shows arrangement | positioning of the bridge girder part, short reinforcement girder, and connection material on the concrete pier (abutment) of a riverbank. The bridge length direction sectional drawing which shows the connection concrete and connection material which embed the bridge girder part and short reinforcement girder on the intermediate bridge pier in a double span floor slab bridge. The top view which abbreviate | omits connection concrete and shows arrangement | positioning of the bridge girder part supported on the said intermediate bridge pier, the short reinforcement girder, and a connection material. The bridge width direction sectional view which shows the state which embedded the bridge girder part supported on the concrete bridge pier and the short reinforcement girder in the connection concrete. The principal part sectional drawing of the bridge width direction which shows the state which connected the bridge girder part and short reinforcement girder supported on the concrete pier to the same pier via the connection material. The bridge length direction sectional drawing of the floor slab bridge which shows an example of the support structure of a concrete bridge pier, and a connection material. The figure which carries out the cross sectional view of the floor slab bridge of the portal ramen structure formed by FIG. 7 on the line which passes through slab concrete, connection concrete, and a concrete pier. The bridge length direction sectional drawing of the floor slab bridge which shows the support structure of a concrete bridge pier, and other examples of a connection material. The figure which carries out the cross sectional view of the floor slab bridge of the portal ramen structure formed by FIG. 9 on the line which passes through slab concrete, connection concrete, and a concrete pier. Sectional drawing of the bridge width direction of the floor slab bridge of each said example. Bridge length direction sectional drawing explaining the case where a ramen bridge is formed with connection concrete and a concrete pier without forming the slab concrete of the floor slab bridge of each of the above examples. The principal part sectional drawing of the bridge width direction which shows an example of the reinforcement structure which embeds the floor slab bridge of each said example in slab concrete, roadbed concrete, and connection concrete.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Bridge girder, 1 '... Bridge girder part, 1a ... Abdominal plate, 1b ... Upper flange, 1c ... Lower flange, 2 ... Concrete pier, 3 ... Slab concrete, 4 ... Floor slab, 5 ... Upper opening, 5' ... Lower Opening, 6 ... Roadbed concrete, 7 ... Road pavement, 8 ... Horizontal reinforcement, 9, 9 '... Suspension reinforcement, 10 ... Bridge seating surface, 11 ... Connection concrete, 11a ... Top of connection concrete, 11b ... Rear side 11c ... same bottom part, 11d ... same left and right side parts, 12 ... sheet pile, 13 ... pillow material, 14 ... connecting material, 14 '... part of connecting material, 15 ... nut, 16, 16' ... vertical reinforcing bar, 17 ... abdominal bar, 18 ... underground foundation pile, 19 ... rebar for sheet pile connection, 20 ... elongate seat plate, 21 ... short reinforcing girder, 21 '... extension end, 21a ... abdominal plate, 21b ... upper flange, 21c ... Lower flange, 22 ... Nut.

Claims (5)

Bridge girders were supported in parallel between the bridge seats of multiple concrete bridge piers, and short reinforcing girders were placed between the bridge girders on the bridge seat surface, and were supported in parallel on the bridge seat surface, and embedded in the concrete bridge piers. The connecting material protrudes upward from the bridge seat surface, the protruding portion is connected to the bridge girder portion, the bridge girder portion is connected to the pier, and another connecting material embedded in the concrete pier is upward from the bridge seat surface. The projecting portion is connected to the short reinforcing girder, the short reinforcing girder is connected to the bridge pier, and the connecting concrete is integrally added to the bridge pier on the bridge seat surface, and the bridge girder portion is inserted into the connecting concrete. And the ramen bridge structure characterized by embedding the short reinforcement girder and the projection part of both said connection materials . The ramen bridge structure according to claim 1, wherein slab concrete is cast between the bridge girders, and roadbed concrete is integrally cast on the upper surface of the slab concrete and the upper surface of the connecting concrete. The ramen bridge structure according to claim 1, wherein both ends of the short reinforcing girder have end portions extending in a bridge length direction from the bridge seat surface. The bridge girder and the short reinforcing girder are supported on the bridge seat surface of the concrete pier via a pillow material, and the space between the bridge seat surface formed by the pillow material and the bridge girder and the short reinforcing girder is filled with the connecting concrete. The ramen bridge structure according to claim 1. The ramen bridge structure according to claim 4, wherein the pillow material is formed of a concrete pillow material that is cast on the bridge seat surface.

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