JP5090306B2 - Synthetic floor slab bridge and its construction method - Google Patents

Description

  The present invention relates to a composite floor slab bridge and a construction method thereof.

  Conventionally, in order to significantly reduce the dead load of the composite floor slab bridge, ribs having flanges at the upper ends are connected to each other in the bridge axis direction on the top surface of the bottom plate portion of the steel shell whose cross section orthogonal to the bridge axis direction has an upward U shape. It is fixed at a predetermined interval, hard urethane foam is laid in a predetermined thickness by spraying between the ribs and between the ribs and the side plates of the steel shell, and it is bulky with lightweight hard such as empty cans, waste materials, etc. Place the waste, spray hard urethane foam on it to form a hard urethane layer with waste embedded in the tensile cross section, and cast concrete on the upper surface of this hard urethane layer to make a composite floor slab It has been proposed.

JP-A-6-81319

  However, the following problem occurs when the upper surface of the hard urethane layer is in contact with the lower surface of the concrete floor board. That is, if the thickness of the concrete layer cast on the upper surface of the hard urethane layer is thin, the desired strength cannot be obtained. On the other hand, if the concrete layer is thick, the purpose of reducing the dead load of the floor slab bridge cannot be achieved. From the viewpoint of ensuring quality, it is desirable that the upper surface (top edge) of the hard urethane layer, which is the substructure of the concrete layer, be as flat as possible. If unevenness (unevenness) exists on the upper surface of the hard urethane layer, this unevenness affects the thickness of the concrete layer, so the skin layer formed on the upper surface of the hard urethane layer is removed when the hard urethane layer is foamed. It is necessary to adjust the level (level adjustment of the upper surface of the hard urethane layer). However, this level adjustment causes poor construction efficiency and increases the work period. Moreover, since the skin layer is a dense and hard dense layer, the upper surface of the hard urethane layer from which the skin layer has been peeled is easily buckled against point loads, and can easily be uneven by weight during operation. It is necessary to work carefully, and this also tends to cause a delay in the work.

  The present invention has been made in view of the above points, and it is an object of the present invention to provide a composite floor slab bridge that can prevent the increase in dead load of the composite floor slab bridge, ensure strength, and shorten the construction period, and its construction method. To do.

  In the invention of claim 1, the composite floor board in the composite floor slab bridge has a steel shell having a U-shaped cross section orthogonal to the bridge axis direction and a top surface of the bottom surface of the steel shell in a direction orthogonal to the bridge axis direction. A plurality of ribs fixed at intervals and along the bridge axis direction and formed with flanges protruding at the upper end in a direction perpendicular to the bridge axis direction, and between the ribs and the side plates of the ribs and the steel shell A hard urethane foam base layer that is filled between the parts and is in close contact with the inner surface of the steel shell and the rib plate part of the rib, and whose upper surface is located below the flange, and a plate material support provided above the hard urethane foam base layer A hard urethane foam plate for a top end that is placed on a member and has a distance from an upper surface of the rigid urethane foam base layer, and an edge in a direction perpendicular to the bridge axis direction is located below the flange; and the top end Rigid urethane foam board A hard urethane foam filling layer filled in the space between the hard urethane foam base layers and foamed to fill the space, and a concrete placed including the upper ends of the ribs on the top hard urethane foam plate The present invention relates to a composite floor slab bridge characterized by comprising a layer.

  Invention of Claim 2 has a through-hole of an up-down direction in the said rigid urethane foam board for tops in Claim 1, and the said rigid urethane foam board for said tops and the said rigid urethane foam base layer from the said through-hole. The hard urethane filled layer is formed by foaming of the hard urethane foam raw material filled in the space between.

  A third aspect of the present invention is characterized in that, in the first or second aspect, the plate material support member is composed of a block of rigid urethane foam, and a plurality of the plate member supporting members are arranged on the upper surface of the rigid urethane foam base layer at intervals. To do.

  A fourth aspect of the present invention is characterized in that, in the first or second aspect, the plate material support member is formed of a block of the hard urethane foam and is fixed to a belly plate portion of the rib.

  According to a fifth aspect of the present invention, in the rib according to any one of the first to fourth aspects, the rib is provided with a detent on the upper surface of the flange, and includes the detent of the upper end of the rib. Is featured.

  In the invention of claim 6, a plurality of ribs having a flange projecting in a direction perpendicular to the bridge axis direction at the upper end on the upper surface of the bottom plate portion of the steel shell whose cross section orthogonal to the bridge axis direction is upward U-shaped. A rigid urethane foam raw material is blown and foamed between the ribs in the steel shell and between the ribs and the side plates of the steel shell with a gap perpendicular to the direction. Thus, the rigid urethane foam base layer whose upper surface is located below the flange is brought into close contact with the inner surface of the steel shell and the rib plate portion of the rib, and is filled between the ribs and between the rib and the side plate portion of the steel shell. A hard urethane foam plate for the top end is disposed above the hard urethane foam base layer, and an edge in a direction perpendicular to the bridge axis direction in the hard urethane foam plate for the top end is formed on the bottom surface of the flange and the hard urethane foam base. Between the lower surface of the top end rigid urethane foam plate and the upper surface of the rigid urethane foam base layer, and interposing a plate material support member between the lower surface of the top end rigid urethane foam plate and the rigid urethane foam. A plurality of vertical through holes are formed in the top end rigid urethane foam plate so as not to overlap with the plate material support member, and the hard urethane foam base layer and the top end are formed from the through holes. A rigid urethane foam filling layer is formed in the space between the rigid urethane foam board for the top end and the rigid urethane foam base layer by filling the foamed urethane foam raw material in the space between the rigid urethane foam boards for foaming and foaming. Concrete is placed on the upper surface of the rigid urethane foam plate for the edges so that it includes the upper ends of the ribs. According to the construction method of synthesizing the floor slab bridge, characterized in that forming the over coat layer and synthetic slabs.

  The invention of a seventh aspect is the invention according to the sixth aspect, wherein the plurality of through holes are formed in a central portion of the joint between the top end urethane plates arranged adjacent to each other in the bridge axis direction. From a through hole formed between the center portion and the flange, a through hole formed between the center of the urethane foam plate for the top end and the flange, and a through hole formed between the plate support member and the nearest flange It is characterized by becoming.

  The invention according to claim 8 is the method according to claim 7, wherein the order of filling the rigid urethane foam raw material from the plurality of through holes into the space between the rigid urethane foam base layer and the top rigid urethane foam plate is the first step. A through hole formed between the plate material support member and the nearest flange, then a through hole formed between the flange and the central portion of the seam of the rigid urethane foam plate for the top end, and then the center of the joint It is the order of the through-hole formed in the part and the through-hole formed between the center of the said rigid urethane foam board for top ends, and the said flange finally.

  The invention according to claim 9 is the bridge in the hard urethane foam board for top end according to any one of claims 6 to 8, wherein the hard urethane foam board for top end is arranged above the hard urethane foam base layer. A spacer is interposed between the upper surface of the edge perpendicular to the axial direction and the lower surface of the flange, and after the formation of the hard urethane foam filling layer, the spacer is removed before the concrete is cast, and the hard urethane for the top end When the concrete layer is formed by placing concrete on the upper surface of the foam plate so as to include the upper ends of the ribs, it is perpendicular to the bridge axis direction in the rigid urethane foam plate for the top edge generated by removing the spacer. The concrete is filled in a gap between the upper surface of the edge in the direction to be cut and the lower surface of the flange.

  According to a tenth aspect of the present invention, in the rib according to any one of the sixth to eighth aspects, the rib is provided with a stopper on the upper surface of the flange, and the rib is formed on the upper surface of the rigid urethane foam plate for the top end. When the concrete is formed so as to include the upper ends of the ribs and the concrete layer is formed, the concrete is cast so as to include the stoppers of the rib upper ends.

  According to the composite floor slab bridge of the present invention, the top surface of the urethane foam board for the top plate, which is the surface on which the concrete is placed, differs from the top surface of the rigid urethane foam directly foamed on the rigid urethane foam base layer. Since it is made of a flat surface without land, level adjustment for removing the skin layer on the upper surface of the urethane foam, which is a concrete placement surface, is not required. Furthermore, according to the present invention, the strength of the upper surface of the urethane foam is reduced by the removal of the skin layer, and the upper surface of the urethane foam is not depressed due to the load of the operator at the time of placing the concrete, and the operator's foot is not taken, The concrete placement work can be done smoothly, the construction period can be shortened, the thickness of the concrete layer can be made constant, the composite floor slab bridge with constant strength and preventing increase of dead load is easy Is obtained.

  In addition, by using a rigid urethane foam block made of the same material as the rigid urethane foam base layer, the rigid urethane foam board for the top edge, and the rigid urethane foam filling layer, the density distribution is reduced and the bridge design is This is preferable. In particular, the hard urethane foam block of the plate material support member is more preferably the same density as the hard urethane foam base layer and the top hard urethane foam plate.

  Furthermore, when a slip stopper is provided on the upper surface of the flange of the rib, the integration between the concrete layer and the rib becomes strong, and the strength of the composite deck slab bridge can be increased. In the present invention, as the slip prevention for preventing the slippage of the concrete layer, a perforation provided in a belly plate portion of a rib in combination with a gibber such as a block gibber, a stud gibber, a perforated steel plate gibber (PBL) or the like. Reinforcing bars can be used.

  According to the construction method of the composite floor slab bridge of the present invention, as described above, the construction of the composite floor slab bridge that prevents an increase in dead load and secures a desired strength can be easily performed with a shortened period. it can.

  Also, a through hole formed at the center of the seam between the top end urethane plates arranged adjacent to each other in the bridge axis direction, a through hole formed between the center of the seam and the flange, and a top end urethane foam Fill the space between the rigid urethane foam base layer and the top rigid urethane foam plate with the rigid urethane foam raw material from the through hole formed between the center of the plate and the flange, and the through hole formed between the plate material support member and the nearest flange. By forming a rigid urethane foam filling layer in the space between the top urethane foam base plate and the rigid urethane foam base layer by foaming, the rigid urethane foam raw material and the rigid urethane foam base layer for the top end Can be filled and foamed without any bias.

  Further, when filling the rigid urethane foam raw material from the through hole, first the through hole formed between the plate material support member and the nearest flange, and then the center and flange at the joint of the top rigid urethane foam plate If the hole is filled in the order of the through hole formed between the flange and the through hole formed at the center of the joint, and finally the through hole formed between the center of the rigid urethane foam plate for the top end and the flange, The foam raw material can be filled in the space between the hard urethane foam board for the top end and the hard urethane foam base layer without unevenness, and can be filled without any gap, ensuring water-stopping.

  Further, when the top urethane foam board is disposed above the hard urethane foam base layer, the top edge of the rigid urethane foam board between the top surface of the edge perpendicular to the bridge axis direction and the bottom surface of the flange of the rib. After forming a rigid urethane foam filling layer in the space between the rigid urethane foam board for the top edge and the rigid urethane foam base layer with a spacer interposed, the rigid urethane foam for the top edge is removed by removing the spacer before placing concrete. Because the gap between the upper edge of the plate and the lower surface of the flange is also filled with concrete, the flange can be wrapped with concrete, and the integrated concrete and ribs are firmly integrated, and the composite floor slab bridge The strength of can be increased.

  Moreover, when the slip stopper is protrudingly provided on the flange upper surface of the rib, the integration of the concrete layer and the rib becomes strong, and the strength of the composite floor slab bridge can be increased.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a cross section orthogonal to a bridge axis of a composite floor slab of a composite floor slab bridge in an embodiment of the present invention, and FIG. 2 is a cross section orthogonal to the bridge axis of the composite floor slab in an embodiment of the present invention. FIG. 3 is a cross-sectional view showing a part of a cross section perpendicular to the bridge axis of the composite floor slab in the same embodiment, FIG. 4 is a cross-sectional view showing a rigid urethane foam base layer being blown during construction, and FIG. FIG. 6 is a cross-sectional view after the rigid urethane foam board for the top end is arranged, FIG. 7 is a plan view after the rigid urethane foam board for the top end is arranged, and FIG. 8 is a bridge shaft. 9 is a cross-sectional view showing a portion of the rigid urethane foam plate for the top end at one end in a direction orthogonal to the direction, FIG. 9 is a cross-sectional view showing the through hole formation, FIG. 10 is a plan view showing the through hole formation, and FIG. FIG. 12 is a sectional view showing the urethane foam filling layer after formation. Sectional view showing a Nkurito strokes after casting, FIG. 13 is a sectional view of the concrete after casting in the direction of the end perpendicular to the Hashijiku direction.

  As shown in FIGS. 1 to 3, the composite floor slab bridge of the present invention is formed on the upper surface of the bottom plate portion 12 of the steel shell 11 in which the cross section orthogonal to the bridge axis direction L is an upward U-shape. A plurality of ribs 21 are fixedly erected by welding or the like along the bridge axis direction L (that is, parallel to the bridge axis direction) with a predetermined interval in the direction W perpendicular to the bridge axis direction. The rib 21 has a T-shaped cross section, and a flange 22 protruding in a direction W perpendicular to the bridge axis direction is formed at the upper end. The position of the flange 22 is a compression cross-sectional area in the steel shell 11, specifically, a concrete placement range described later. On the upper surface of the flange 22, a stud diver (columnar protrusion) 24 is provided so as to prevent displacement. The interval between the flanges 22 between the ribs 21 is appropriately determined. For example, when the bridge length is 25200 mm, the total width is 8390 mm, and the height of the steel shell 11 is 790 mm, the height of the rib 21 up to the top surface of the flange 22 is 590 mm, the width of the flange 22 is 310 mm, the flange interval is 1200 mm, Take an example of 150 mm.

  A rigid urethane foam base layer 31 is filled between the ribs 21 and between the ribs 21 and the side plate portions 13 of the steel shell 11. The rigid urethane foam base layer 31 was foam-cured by spraying a rigid urethane foam raw material onto the inner surface of the side plate portion 13 and the upper surface of the bottom plate portion 12 of the steel shell 11 and the abdomen plate portion (vertical portion) 23 of the rib 11. It is made of closed-cell rigid urethane foam, is in close contact with the inner surface of the steel shell 11 (the inner surface of the side plate portion 13 and the upper surface of the bottom plate portion 12) and the abdomen plate portion 23 of the rib 21, and the upper surface 33 is below the flange 22 Located away from. The distance from the lower surface of the flange 22 to the upper surface 33 of the rigid urethane foam base layer 31 is set appropriately, and an example is 100 mm.

  A plurality of plate material support members 41 are provided above the rigid urethane foam base layer 31. In this embodiment, a plate material support member 41 is placed on the upper surface 33 of the rigid urethane foam base layer 31. The plate-like support member 41 has a block shape (a rectangular parallelepiped shape or a cubic shape), and an upper surface 42 is located below the flange 22. In the present embodiment, the plate-like support member 41 is made of a hard urethane foam block (50 × 100 × 100 mm). As shown in FIG. 7, the flange 22 extends in a direction W perpendicular to the bridge axis direction. It arrange | positions in the position which can support the four corners of the urethane foam board 61 for top ends at intervals. The block of the rigid urethane foam constituting the plate material support member 41 is preferably the same in density as the rigid urethane foam base layer 31 and the rigid urethane foam constituting the top end urethane foam plate 61 described later.

  The top end urethane foam plate 61 is placed on the top surface of the plate material support member 41, and the top of the top urethane foam base layer 31 is covered with the top end urethane foam plate 61. The top end urethane foam plate 61 and the upper surface 33 of the rigid urethane foam base layer 31 are separated by a predetermined distance by the plate-like support member 41. The urethane foam plate 61 for the top plate has a rectangular planar shape, and an edge 62 in the direction W perpendicular to the bridge axis direction is inserted below the flange 22. The size of the top foam foam plate 61 is such that the dimension of W in the direction orthogonal to the bridge axis direction is larger than the interval between the flanges 22 by a predetermined dimension, for example, 50 to 200 mm larger. It is smaller than between the plate portions 23. The urethane foam plate 61 for the top end of the present embodiment is made of rigid urethane foam, and one sheet has a thickness of 50 mm and a plane dimension of 500 × 1000 mm. The density of the rigid urethane foam constituting the top end urethane foam plate 61 is preferably the same as the density of the rigid urethane foam block constituting the rigid urethane foam base layer 31 and the plate material support member 41. Note that the top end urethane foam plates 61A located at both ends in the direction W orthogonal to the bridge axis direction are narrower than the top end urethane foam plates 61 at other positions in this embodiment. .

  In the space between the top end rigid urethane foam plate 61 and the rigid urethane foam base layer 31, a rigid urethane foam filling layer 71 formed by foaming to fill the space is formed. The rigid urethane foam filling layer 71 includes the upper surface 33 of the rigid urethane foam base layer 31, the surface of the plate material support member 41, the lower surface of the flange 22, and the rib 21 between the flange 22 and the upper surface 33 of the rigid urethane foam base layer 31. It is in close contact with the abdomen. As shown in FIG. 9, the rigid urethane foam filling layer 71 is formed by forming a plurality of through holes 63a to 63d in the top end rigid urethane foam plate 61, and the rigid urethane foam from the through holes 63a to 63d. This is done by injecting the raw material into the space between the hard urethane foam plate 61 for the top end and the hard urethane foam base layer 31 and foaming. In addition, the injection | pouring order of the rigid urethane foam raw material in the said through-holes 63a-63d is explained in full detail by the paragraphs 0036-0038 in the below-mentioned construction method.

  On the upper surface of the rigid urethane foam plate 61 for the top end, there is provided a concrete layer 81 that is placed so as to include the upper end of the rib 21, that is, the stud gibel 24 on the flange 22. Further, asphalt or the like is laid on the upper surface of the concrete layer 81 and a pavement 85 is applied. Moreover, the ground cover part 87 is formed in the both sides of the direction W orthogonal to the bridge axis direction in the said concrete layer 81, and a handrail is installed in the said ground cover part 87 as needed.

  Examples of the construction method of the composite floor slab bridge will be described with reference to FIGS. As already shown in FIGS. 1 to 3, the cross section perpendicular to the bridge axis direction L has an upward U-shaped cross section, and the upper surface of the bottom plate portion 12 of the steel shell 11, as shown in FIG. A plurality of ribs 21 having the flanges 22 projecting in a direction W orthogonal to each other are spaced apart from each other in a direction W orthogonal to the bridge axis direction and along the bridge axis direction (L in FIG. 1), that is, It is fixed upright by welding etc. in parallel with the bridge axis direction. The spacing between the ribs 21 in the direction W perpendicular to the bridge axis direction, the height of the ribs 21 to the top surface of the flange 22, the width of the flange 22, the spacing between the flanges, the height of the stud gibel 24, and the like are as described above. .

  Then, the hard urethane foam raw material F is blown and foamed by the nozzle 91 of the raw material injecting device between the ribs 21 in the steel shell 11 and between the ribs 21 and the side plate portions 13 of the steel shell 11, as shown in FIG. As shown in FIG. 2, the closed-cell rigid urethane foam base layer 31 whose upper surface 33 is located below the flange 22 is brought into close contact with the inner surface of the steel shell 11 and the abdomen plate portion 23 of the rib 21. And it fills between the side plate part 13 of the said rib 21 and the said steel shell 11. FIG. The distance from the lower surface of the flange 22 to the upper surface 33 of the urethane foam base layer 31 is set appropriately, and an example is 100 mm. The upper surface 33 of the rigid urethane foam base layer 31 is in a non-land state where a skin layer formed by foaming is present, and flattening work for level adjustment is unnecessary.

  Next, as shown in FIG. 6, a predetermined number of the top end rigid urethane foam plates 61 are arranged above the rigid urethane foam base layer 31 after the foam curing, and the bridge axis direction of the top end rigid urethane foam plates 61 is arranged. An edge 62 in a direction W perpendicular to the upper surface 33 is positioned between the lower surface of the flange 22 and the upper surface 33 of the rigid urethane foam base layer 31. At the same time, a plurality of plate material support members 41 are inserted between the lower surface of the top end rigid urethane foam plate 61 and the upper surface 33 of the rigid urethane foam base layer 31, and the bottom surface of the top end rigid urethane foam plate 61 and the hard end A plate material support member 41 is interposed between the upper surface 33 of the urethane foam base layer 31, and a space is formed between the lower surface of the top hard urethane foam plate 61 and the upper surface 33 of the hard urethane foam base layer 31. As a result, the top urethane foam base plate 61 is arranged so as to cover the rigid urethane foam base layer 31 and leave a gap with the rigid urethane foam base layer 31.

  As described above, the plate material support member 41 has a block shape (a rectangular parallelepiped shape or a cubic shape). The plate-like support member 41 has such a size that the upper surface of the edge 62 of the top end rigid urethane foam plate 61 can be brought into contact with or pressed against the lower surface of the flange 22. Block (50 × 100 × 100 mm). As shown in the plan view of FIG. 7, the plate-like support member 41 is spaced from the flange 22 in the direction W perpendicular to the bridge axis direction and supports the four corners of the top urethane foam plate 61. It is arranged at a position where it can.

  In the present embodiment, the top end rigid urethane foam plates 61A (shown in FIG. 2) disposed at both ends in the direction W perpendicular to the bridge axis direction, as shown in FIG. The edge 62B on the side plate portion 13 side is sandwiched between the metal fittings B such as bolts protruding from the inner surface of the side plate portion 13 of the steel shell 11 and the upper surface 42 of the plate material support member 41, and is held thereby. On the other hand, the other edge 62 </ b> A of the top end rigid urethane foam plate 61 </ b> A is supported by the upper surface 42 of the plate material support member 41 in the same manner as the other top end rigid urethane foam plates 61.

  Then, as shown in FIGS. 9 and 10, a plurality of through holes 63 a to 63 d in the vertical direction are formed in the top end rigid urethane foam plate 61 at positions where they do not overlap the plate material support member 41 with a drill or the like. The plurality of through holes 63a to 63d formed in the top end rigid urethane foam plate 61 are formed at the center of the joint 64 between the top end urethane plates 61 and 61 arranged adjacent to the bridge axis direction L. The through hole 63a, the through hole 63b formed between the center portion of the joint 64 and the flange 22, the through hole 63c formed between the center 61a of the top end urethane foam plate 61 and the flange 22, A through hole 63d formed between the plate material support member 41 and the nearest flange 22 is formed. The diameter of the through holes 63a to 63d is set to a dimension that allows insertion of the nozzle of the raw material injection device, for example, 15 mm. The top end rigid urethane foam plate 61 is formed with a through hole 63a to 63d and a confirmation hole 65 penetrating in the vertical direction near the flange 22 at a predetermined position not overlapping the plate material support member 41.

  A nozzle of a raw material injection device is inserted into the through holes 63a to 63d, and a hard urethane foam raw material is filled into a space 67 between the hard urethane foam base layer 31 and the top hard urethane foam plate 61 and foamed. The filling of the rigid urethane foam raw material is performed after the foaming of the rigid urethane foam base layer 31 is finished and the temperature of the rigid urethane foam base layer 31 is lowered. The filling order of the rigid urethane foam raw material is set as appropriate, but more preferably, the through hole 63d formed between the plate material support member 41 and the nearest flange 22, and then the rigid urethane foam for the top end. A through hole 63b formed between the central portion of the joint 61 of the plate 61 and the flange 22, a through hole 63a formed in the central portion of the joint 64, and finally the center 61a of the rigid urethane foam plate 61 for the top end. The through hole 63c formed between the flange 22 and the flange 22 is preferably in this order. If this is done, the rigid urethane foam raw material is uniformly filled in the space 67 between the top urethane foam base plate 31 and the rigid urethane foam base layer 31. Can do. In the present embodiment, the top end rigid urethane foam plates 61A disposed at both ends in the direction W orthogonal to the bridge axis direction are narrower than the other top end rigid urethane foam plates 61. Therefore, the number of through holes is reduced as compared with the other hard urethane foam plate 61 for the top end. For example, through holes are provided at two locations along the flange 22 in the hard urethane foam plate 61A for the top end at both ends and at two locations along the side plate portion 13 of the steel shell 11. The through hole may be plugged and closed after filling with the rigid urethane foam raw material.

  The hard urethane foam raw material filled in the space 67 between the top urethane foam board 61 and the rigid urethane foam base layer 31 fills the space 67 by foaming, and as shown in FIG. It becomes. At that time, if there is a crack in the rigid urethane foam base layer 31 or a gap due to peeling of the rib 21 from the abdomen, the foam penetrates into the crack or gap and closes the crack or gap. The hard urethane foam plate 61 for the top end is pushed upward when the hard urethane foam raw material is filled in the space 67, but the edge 62 in the direction W perpendicular to the bridge axis direction is Abutting on the lower surface of the flange 22, the upward movement of the top-end rigid urethane foam plate 61 is prevented. The confirmation that the rigid urethane foam material has filled the space 67 is performed by visually confirming that the confirmation hole 65 is blocked with the rigid urethane foam material.

  The rigid urethane foam filling layer 71 formed by foaming of the rigid urethane foam raw material is formed by foaming the upper surface 33 of the rigid urethane foam base layer 31, the surface of the plate material support member 41, the rigid urethane foam plate 61 for the top end. It is in close contact with the lower surface, the stomach plate portion of the rib 21 between the flange 22 of the rib 21 and the upper surface 33 of the rigid urethane foam base layer 31, and the lower surface of the flange 22.

  Next, concrete is placed on the top surface of the top hard urethane foam plate 61 so as to include the upper ends of the ribs 21 (stud gibber 24 on the flange 22), and as shown in FIG. 81 is formed as the composite floor slab 1. FIG. 13 is a cross-sectional view showing one end of the composite floor slab 1 in the direction W orthogonal to the bridge axis direction.

  As shown in FIGS. 1 and 2, asphalt or the like is laid on the upper surface of the concrete layer 81 to be paved 85. Thereafter, the ground cover portions 87 shown in FIGS. 1 and 2 are formed on both sides of the concrete layer 81 in the direction W orthogonal to the bridge axis direction, and a railing is installed in the ground cover portion 87 as necessary. The

  The composite floor slab bridge of the above embodiment is an example in which the rib 21 in the composite floor slab 1 has a stud gibel 24 as a displacement stopper on the upper surface of the flange 22, but the upper surface of the flange 22 has a displacement stopper. There are also examples that do not. This will be described below. The composite floor slab 1A of the composite floor board bridge shown in FIG. 14 is an example in which the rib 21 does not have a displacement stopper on the upper surface of the flange 22. In the synthetic floor slab 1A, as shown in FIG. 15 showing a partial cross section, between the upper surface of the edge 62 in the direction W perpendicular to the bridge axis direction and the lower surface of the flange 22 in the rigid urethane foam plate 61 for the top end. The concrete layer 81 is partially filled, and the concrete layer 81 includes the entire upper surface of the flange 22 and both sides of the lower surface in the width direction. Other configurations of the composite floor board bridge 1A are the same as those of the composite floor slab 1 described above.

  An embodiment of the construction method of the composite floor slab bridge in the case where the rib 21 does not have a displacement stopper on the upper surface of the flange 22 will be described. The construction method of the composite floor slab bridge in the case where the upper surface of the flange does not have the slip stopper is the above-described embodiment of the construction method of the composite floor slab bridge in the case where the stud gibber 24 is provided on the upper surface of the flange 22. When the top-end hard urethane foam plate 61 is disposed above the hard urethane foam base layer 31, the top surface of the edge 62 in the direction W perpendicular to the bridge axis direction and the bottom surface of the flange 22 in the top-end hard urethane foam plate 61. The only difference is that a step of arranging a spacer in between is added, and a step of removing the spacer is added after the formation of the rigid urethane foam filling layer 71 and before the concrete placement. Parts that overlap with the construction method of the composite floor slab bridge of the embodiment already described will be described briefly in order to prevent redundant description.

  First, as shown in FIG. 16, hard urethane foam raw material F is sprayed by the nozzle 91 of the raw material injection apparatus between the ribs 21 in the steel shell 11 and between the ribs 21 and the side plate portions 13 of the steel shell 11. By foaming, as shown in FIG. 17, the closed-cell rigid urethane foam base layer 31 whose upper surface 33 is located below the flange 22, and the inner surface of the steel shell 11 and the stomach plate portion 23 of the rib 21, It is made to contact | adhere and it fills between the said ribs 21 and between the said ribs 21 and the side-plate part 13 of the said steel shell 11. FIG.

  Next, as shown in FIG. 18, a predetermined number of the hard urethane foam plates 61 for the top end are arranged above the hard urethane foam base layer 31 after the foam curing, and the bridge in the hard urethane foam plate 61 for the top end is arranged. An edge 62 in the direction W perpendicular to the axial direction is positioned between the lower surface of the flange 22 and the upper surface 33 of the rigid urethane foam base layer 31. At the same time, a plurality of the plate material support members 41 are inserted between the lower surface of the top end rigid urethane foam plate 61 and the upper surface 33 of the rigid urethane foam base layer 31, and the bottom surface of the top end rigid urethane foam plate 61 and the above-mentioned A plate material support member 41 is interposed between the upper surfaces 33 of the hard urethane foam base layer 31, and a space is formed between the lower surface of the top hard urethane foam plate 61 and the upper surface 33 of the hard urethane foam base layer 31. Further, a spacer 27 is inserted between the upper surface of the edge 62 in the direction W orthogonal to the bridge axis direction and the lower surface of the flange 22 in the top end rigid urethane foam plate 61. The spacer 27 is for separating the top-end rigid urethane foam plate 61 from the lower surface of the flange 22 by a predetermined distance, and is made of a suitable material, for example, a string-like or belt-like shape made of an elastic material such as rubber, or It is composed of a block-like one that can be set apart, and has an appropriate height of 40 to 120 mm, preferably 60 to 100 mm, and specifically 80 mm. Accordingly, the top urethane foam base plate 61 covers the upper portion of the hard urethane foam base layer 31 with a gap between the top and the hard urethane foam base layer 31 and at a position away from the lower surface of the flange 22. Be placed. Further, when the spacer 27 is in a block shape, the hard urethane foam raw material is sprayed to the extent that it overflows from the rib plate part of the rib and the side plate part of the steel shell to the lower part of the flange. The trimming is appropriately performed according to the spacer 27. The plate-like support member 41 of this embodiment has the spacer 27 between the upper surface of the edge 62 in the direction W orthogonal to the bridge axis direction of the rigid urethane foam plate 61 for the top end and the lower surface of the flange 22. It is said to be a height that leaves an insertable space.

  FIG. 19 is a plan view of a state in which the top end rigid urethane foam plate is arranged, and the specific configurations of the top end rigid urethane foam plate 61 and the plate-like support member 41 are as described above. FIG. 20 is a cross-sectional view showing a holding state of the edge 62B on the side plate portion 13 side of the steel shell 11 in the top hard urethane foam plate 61A arranged at both ends in the direction W orthogonal to the bridge axis direction. This is the same as the holding method in the construction method of the embodiment already described.

  Next, as shown in FIGS. 21 and 22, a plurality of through holes 63 a to 63 d in the vertical direction are formed in the top end rigid urethane foam plate 61 with a drill or the like at a position not overlapping the plate material support member 41, A nozzle of a raw material injection device is inserted into the through holes 63a to 63d, and a hard urethane foam raw material is filled into a space 67 between the hard urethane foam base layer 31 and the top hard urethane foam plate 61 and foamed. The specific positions, sizes, filling orders of the rigid urethane foam raw materials, and the like of the through holes 63a to 63d are as described above. As shown in FIG. 23, the hard urethane foam filling layer 71 is formed in the space 67 between the top hard urethane foam plate 61 and the hard urethane foam base layer 31 by foaming of the filled rigid urethane foam raw material.

  Thereafter, the spacer 27 interposed between the upper surface of the edge 62 in the direction W perpendicular to the bridge axis direction and the lower surface of the flange 22 in the top hard urethane foam plate 61 is removed, as shown in FIG. A gap 28 is formed between the upper surface of the edge 62 and the lower surface of the flange 22 in the direction W perpendicular to the bridge axis direction in the hard urethane foam plate 61 for the top end.

  Next, concrete is placed on the upper surface of the top end rigid urethane foam plate 61 so as to include the upper end (flange 22) of the rib 21, and a concrete layer 81 is formed as shown in FIG. It is set as the synthetic floor slab 1A. At that time, the concrete is also filled in the gaps 28 (shown in FIG. 24) generated by the removal of the spacers 27, and in the flange 22 portion, the concrete layer 81 has the entire upper surface and the width of the lower surface of the flange 22. It is in a state of including (enclosing) both sides in the direction. FIG. 26 is a cross-sectional view showing one end of a direction W perpendicular to the bridge axis direction in the composite floor slab 1A. Thereafter, as shown in FIGS. 14 and 15, asphalt or the like is laid on the upper surface of the concrete layer 81 to be paved 85. Then, on both sides of the concrete layer 81 in the direction W orthogonal to the bridge axis direction, the ground cover portion 87 shown in FIG. 14 is formed, and a railing is installed on the ground cover portion 87 as necessary.

  Moreover, in the embodiment of the composite floor slab bridge and its construction method, an example in which the plate material support member 41 is simply placed on the upper surface 33 of the hard urethane foam base layer 31 is shown. The rib 21 may be fixed to the abdomen plate portion 23 by adhesion or the like. FIG. 27 is a cross section in a direction orthogonal to the bridge axis direction of the composite floor slab bridge when the plate member support member 41 is fixed to the abdomen plate portion 23 of the rib 21 in the example having the stud gibel 24 on the upper surface of the flange 22. FIG. 28 and FIG. 28 are sectional views showing a part thereof. In this case, the plurality of through holes for injecting the rigid urethane foam material formed in the top end rigid urethane foam plate 61 are formed at positions that do not overlap the plate material support member 41. Similarly, in the example in which the upper surface of the flange 22 does not have a displacement stopper, the plate material support member 41 may be fixed to the stomach plate portion 23 of the rib 21 by adhesion or the like.

  Also, in the example in which the stud 22 is provided on the upper surface of the flange 22, the entire upper surface of the flange 22 including the stud dibel 24 and both sides in the width direction of the lower surface may be included (enclosed) by the concrete layer 81. That is, when the hard urethane foam filling layer 71 is formed, the spacer 27 is interposed between the upper surface of the edge 62 in the direction W orthogonal to the bridge axis direction and the lower surface of the flange 22 in the hard urethane foam plate 61 for the top end. After the formation of the hard urethane foam filling layer 71, the concrete layer 81 is formed by removing the spacer 27 and placing concrete, and at that time, the lower surface of the flange 22 and the hard urethane for the top end are formed. Concrete may also be filled in the gap after the spacer removal that occurs between the upper surfaces of the edges 62 in the direction W perpendicular to the bridge axis direction in the foam plate 61. By doing so, the integration of the concrete layer 81 and the rib 21 becomes stronger, and the strength of the composite floor slab bridge can be increased.

  Further, in the case of having the stud gibber 24, a water-stopping packing (not shown) is inserted between the top end rigid urethane foam plate 61 and the flange 22, and the through hole of the top end rigid urethane foam plate 61 is inserted. If the rigid urethane foam raw material is filled, it is possible to prevent the urethane from overflowing between the top-end rigid urethane foam plate 61 and the flange 22 when the rigid urethane foam is foamed. The water-stop packing has a width of about 20 mm and a thickness of about 10 mm. The water blocking packing can be used in place of the spacer 27 or can be used in combination with the spacer 27. When using together, it is preferable to insert the spacer 27 after temporarily fixing the water-stopping packing below the flange 22.

  In the composite floor slab bridge constructed as described above and the construction method thereof, the urethane foam board for the top plate that is the placing surface of the concrete is composed of a rigid urethane foam directly foamed on the rigid urethane foam base layer. In contrast, since it has a flat top surface with no unevenness, it is not necessary to adjust the level to remove the skin layer on the top surface of the urethane foam, which is the concrete placement surface, and the strength of the top surface of the urethane foam can be increased by removing the skin layer. Since the upper surface of the urethane foam is depressed by the operator's load when the concrete is placed and the operator's feet are not removed, the concrete can be placed smoothly and the construction period is shortened. In addition, the thickness of the concrete layer can be made constant, and a composite floor slab having a constant strength and preventing an increase in dead load can be easily obtained.

It is a perspective view showing the section orthogonal to a bridge axis about a composite floor slab of a composite floor slab bridge in one example of the present invention. It is sectional drawing orthogonal to the bridge axis of the composite floor slab in the Example. It is sectional drawing which shows a part of cross section orthogonal to the bridge axis of the composite floor slab in the Example. It is sectional drawing which shows the time of spraying formation of the rigid urethane foam base layer at the time of construction. It is sectional drawing which shows after the rigid urethane foam base layer filling. It is sectional drawing which shows the rigid urethane foam board arrangement | positioning for top ends. It is a top view which shows the hard urethane foam board arrangement | positioning for top ends. It is sectional drawing which shows the hard urethane foam board part for top ends of the end of the direction orthogonal to a bridge axis direction. It is sectional drawing which shows after through-hole formation. It is a top view which shows after through-hole formation. It is sectional drawing which shows after the rigid urethane foam filling layer formation. It is sectional drawing which shows after concrete placement. It is sectional drawing which shows after concrete placement in the part of the one end of the direction W orthogonal to a bridge axis direction. It is a perspective view showing the section which intersects perpendicularly to a bridge axis about a composite floor slab of a composite floor slab bridge in an example in case there is no slip on a flange upper surface. It is sectional drawing which shows a part of cross section orthogonal to the bridge axis of the composite floor slab in the Example. It is sectional drawing which shows the time of spraying formation of the rigid urethane foam base layer at the time of construction in case there is no slip prevention on the flange upper surface. It is sectional drawing which shows after the rigid urethane foam base layer filling in the Example. It is sectional drawing which shows the hard urethane foam board arrangement | positioning for top ends in the Example. It is a top view which shows the hard urethane foam board arrangement | positioning for top ends in the Example. It is sectional drawing which shows after concrete placement about the part of the end of the direction W orthogonal to the bridge-axis direction in the Example. It is sectional drawing which shows after the through-hole formation in the Example. It is a top view which shows after the through-hole formation in the Example. It is sectional drawing which shows after the rigid urethane foam filling layer formation in the Example. It is sectional drawing which shows after the spacer removal in the Example. It is sectional drawing which shows the concrete after placement in the Example. It is sectional drawing which shows after concrete placement about the part of the end of the direction W orthogonal to the bridge-axis direction in the Example. It is sectional drawing orthogonal to the bridge axis in the synthetic floor board of the synthetic floor slab bridge at the time of fixing a board | plate material support member to the belly board part of a rib. It is sectional drawing which shows a part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Synthetic floor slab 11 Steel shell 21 Rib 22 Flange 27 Spacer 31 Hard urethane foam base layer 41 Board material support member 61 Hard urethane foam board for top edge 71 Hard urethane foam filling layer 81 Concrete layer

Claims (10)

The composite floor board in the composite floor slab bridge
A steel shell with a U-shaped cross section perpendicular to the bridge axis direction;
A plurality of flanges projecting in a direction perpendicular to the bridge axis direction are formed on the upper surface of the bottom plate portion of the steel shell at intervals in the direction orthogonal to the bridge axis direction and fixed along the bridge axis direction. The ribs,
A rigid urethane foam base layer that is filled between the ribs and between the ribs and the side plate portions of the steel shell and is in close contact with the inner surface of the steel shell and the belly plate portion of the ribs, and the upper surface is located below the flange,
Placed on a plate material support member provided above the rigid urethane foam base layer, spaced from the upper surface of the rigid urethane foam base layer, and an edge in a direction perpendicular to the bridge axis direction is located below the flange Hard urethane foam board for the top end
A rigid urethane foam filling layer filled in a space between the rigid urethane foam plate for the top end and the rigid urethane foam base layer and foamed to fill the space;
A composite floor slab bridge comprising a concrete layer placed on the top end rigid urethane foam board including the upper end of the rib.   A rigid urethane foam raw material filled in a space between the rigid urethane foam board for the top end and the rigid urethane foam base layer through the through hole having a vertical through hole in the rigid urethane foam board for the top end. The synthetic floor slab bridge according to claim 1, wherein the hard urethane filled layer is formed by foaming.   3. The composite floor slab bridge according to claim 1, wherein the plate material supporting member is made of a block of rigid urethane foam, and a plurality of the plate material supporting members are arranged on the upper surface of the rigid urethane foam base layer at intervals.   3. The composite floor slab bridge according to claim 1, wherein the plate material support member is made of a block of the hard urethane foam and is fixed to a belly plate portion of the rib.   5. The rib according to claim 1, wherein a slip stopper is provided on an upper surface of the flange, and the concrete layer is placed so as to include a slip stopper at the upper end of the rib. The composite floor slab bridge according to one item. A plurality of ribs having flanges projecting in a direction orthogonal to the bridge axis direction at the upper end on the upper surface of the bottom plate portion of the steel shell whose cross section orthogonal to the bridge axis direction is upward U-shaped, and spaced in the direction orthogonal to the bridge axis direction Open up and stick upright in the direction of the bridge axis,
By blowing and foaming a rigid urethane foam raw material between the ribs in the steel shell and between the ribs and the side plate portions of the steel shell, the hard urethane foam base layer whose upper surface is located below the flange, It is in close contact with the inner surface of the steel shell and the rib plate portion of the rib and between the ribs and between the rib and the side plate portion of the steel shell,
A hard urethane foam plate for the top end is disposed above the hard urethane foam base layer, and an edge in a direction orthogonal to the bridge axis direction in the hard urethane foam plate for the top end is formed on the lower surface of the flange and the upper surface of the hard urethane foam base layer. And between the lower surface of the top urethane foam base plate and the upper surface of the hard urethane foam base plate, a plate material support member is interposed between the lower surface of the top urethane foam base plate and the hard urethane foam base layer. Leave a gap with the top surface,
Forming a plurality of through holes in the vertical direction on the top rigid urethane foam plate at a position that does not overlap with the plate material support member,
The space between the rigid urethane foam base layer and the top end rigid urethane foam plate is filled from the through hole with a rigid urethane foam raw material and foamed to form a space between the top end rigid urethane foam plate and the rigid urethane foam base layer. Form a rigid urethane foam filling layer in the space,
A method for constructing a composite floor slab bridge, comprising placing concrete on the upper surface of the top rigid urethane foam plate so as to include the upper end of the rib to form a concrete layer to form a composite floor slab.   The plurality of through-holes are formed in the central portion of the joint between the top end urethane plates arranged adjacent to each other in the bridge axis direction, and the through-hole formed between the central portion of the joint and the flange 7. The hole according to claim 6, comprising a hole, a through hole formed between the center of the top urethane foam plate and the flange, and a through hole formed between the plate support member and the nearest flange. Construction method of composite floor slab bridge.   The order of filling the rigid urethane foam raw material into the space between the rigid urethane foam base layer and the top rigid urethane foam plate from the plurality of through holes is first between the plate material support member and the nearest flange. The formed through-hole, then the through-hole formed between the flange and the central part of the seam of the rigid urethane foam plate for the top end, then the through-hole formed in the central part of the seam, and finally the top end The construction method of the composite floor slab bridge according to claim 7, wherein the through hole formed between the center of the rigid urethane foam board for use and the flange is in this order. When the top-end rigid urethane foam plate is disposed above the rigid urethane foam base layer, a spacer is provided between the upper surface of the edge of the top-end rigid urethane foam plate in the direction perpendicular to the bridge axis direction and the lower surface of the flange. Intervene,
After the formation of the rigid urethane foam filling layer, the spacer is removed before placing the concrete,
When the concrete layer is formed by placing concrete on the top surface of the hard urethane foam plate for the top edge so as to include the upper end of the rib, the hard urethane foam plate for the top edge generated by removing the spacer The construction of the composite floor slab bridge according to any one of claims 6 to 8, wherein the concrete is filled in a gap between the upper surface of the edge in a direction perpendicular to the bridge axis direction and the lower surface of the flange. Method. The rib is provided with a slip stopper on the upper surface of the flange,
When the concrete layer is formed by placing concrete on the top surface of the rigid urethane foam plate for the top edge so as to include the upper end of the rib, the concrete is cast so as to include a stopper for the upper end of the rib. The construction method of the composite floor slab bridge according to any one of claims 6 to 8, wherein the construction method is provided.

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