JP2007032057A - Expansion device of bridge joint section and joint method of bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an expansion device of a bridge joint section capable of easily corresponding also to a large amount of expansion of earthquake motion level 2 by a comparatively simple expansion device at a low cost, having the excellence in a joint performance such as durability, workability, maintenance, reduced noise, low vibration and perfect cut-off efficiency or the like and making available for the time of peace as well even if an expansion spacing is furthermore greatly opened in the case of big earthquake in the cantilever beam finger joint type expansion device. <P>SOLUTION: The expansion device of the bridge joint section is so constituted that the expansible spacing 16 is formed between a surface member 11 consisting of a pair of comb face plates 20 and 20 and a pair of substratum members 12 and 12 installed by holding the expansion spacing 2 in the notched bottom, a sandwich construction is formed by holding an intermediate member 13 consisting of a beam-like high-strength fiber reinforced concrete or the like continued in the direction at right angles to a widening bride axis having sliding surfaces in up and down, and an expansion gap 17 in both sides of the intermediate member 13 is closed by an elastic sealing member 15, and that the intermediate member 13 always supports a finger section of the surface member 11 to the expansion of a main girder. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an expansion device for a bridge joint portion used for an elevated road, a road bridge, and the like, and a bridge joint method using the expansion device.

  In an elevated road or a road bridge, an expansion / contraction device is provided to cope with stress due to expansion / contraction due to temperature change or vibration. As a conventional expansion / contraction device, a steel expansion / contraction device, a cast iron expansion / contraction device, a synthetic rubber expansion / contraction device and the like have already been commercialized and used for joints. Synthetic rubber expansion and contraction device is a combination of rubber material and steel plate, and has advantages such as relatively low cost, low noise, good workability and running properties, etc., but it has poor durability. A so-called finger joint composed of a pair of comb-shaped face plates is often used because it cannot cope with a large amount of expansion and contraction and it is necessary to be careful of damage in a snowy area.

  This finger joint is structurally different from the method of supporting the wheel load of the loose part of the joint, so that both ends of the face plate are supported, and the cantilever type that projects over the face plate It is divided roughly into. Since the both-end support type is difficult to secure production and construction accuracy, the cantilever type is currently the mainstream (see, for example, Patent Document 1).

  Further, as a prior art related to the present invention, one face plate of a pair of face plates is placed on a support plate, and its fingers can be deformed so that a large amount of movement in the direction of the bridge axis and the direction perpendicular to the bridge axis can be absorbed. A telescopic device for a bridge (see Patent Document 2), a pair of face plate fingers swingably attached, and a bridge telescopic device (see Patent Document 3) capable of absorbing a large amount of movement in a direction perpendicular to the bridge axis, An expansion / contraction portion of a bridge (Patent Document 4) and the like in which a pair of precast members provided with finger joints are fitted in a recess and a projection so as to be extendable and contracted has been proposed.

JP 2001-288707 A JP 2000-96502 A JP 2000-73305 A JP-A-7-268815

  In recent years, the design of bridges for seismic isolation bearings, which is advantageous for earthquake response, has become mainstream. In addition, in the seismic design of bridges, two types are considered: ground motion level 1 that has a high probability of occurring during the operation period of the bridge and earthquake motion level 2 that has a low probability of occurring during the service period but has a high strength. It has become. Therefore, joint development corresponding to the amount of dynamic movement in this bridge design has been made in various directions.

  In the case of a cantilever type finger joint, a large face plate can be used to easily cope with a large amount of expansion / contraction, but the thickness of the face plate increases, and a cradle that cantilever supports the face plate Due to the increase in size, there are problems such as an increase in cost and a long time for construction. In addition, since the receiving hook and elastic seal material are only installed under the fingers that can be engaged with each other, if there is a large gap between the tips of the pair of fingers, A gap may be formed and the vehicle may not be able to travel.

  The present invention has been made to solve the above-described problems. In a cantilever-type finger joint type expansion / contraction device installed at a bridge joint portion, seismic motion is achieved by a relatively simple and low-cost expansion / contraction device. It can easily cope with a large amount of expansion and contraction of level 2, and has excellent joint performance such as durability, workability, maintainability, low noise / vibration, and complete water-stopping. It is an object of the present invention to provide a bridge joint expansion and contraction device and a bridge joint construction method that can be used in the same manner as normal times even when they are wide open.

  In the invention according to claim 1 of the present invention, there is a gap in the upper notch space of the bridge joint portion in which the bridge body (bridge girder, abutment) is arranged opposite to the gap at the intermediate portion or the end portion in the bridge axis direction of the bridge. A bridge shaft having a sliding surface above and below between a surface layer member made up of a pair of comb-shaped face plates and a pair of lower layer members installed with a gap between the notch bottoms It is a sandwich structure that sandwiches a beam-shaped intermediate member that is continuous in a perpendicular direction, and is characterized in that the beam-shaped intermediate member supports the finger portion of the surface layer member against expansion and contraction of the bridge body. This is a telescopic device for a bridge joint (see FIG. 1).

  It is the basic structure of the expansion / contraction device of the present invention, in which an expansion / contraction space is formed between the surface layer member and the lower layer member, and a wide beam-shaped intermediate member is arranged in the bridge axis direction, and the bridge axis direction of this intermediate member Elastic sandwiches are placed in the expansion and contraction gaps on both sides to create a sandwich structure, which can easily handle large expansion and contraction levels of seismic vibration level 2 with a relatively simple and low-cost expansion and contraction device. Joint performance, workability, maintainability, low noise / vibration, complete waterproofing, etc., and it can be used in the same way as normal even if there is a large gap during a large earthquake. is there.

  As the surface layer member, a so-called finger joint of a cantilever type composed of a comb-shaped face plate such as a flat plate type or an angle type is used. Plates made of steel, stainless steel, cast iron, cast steel, spheroidal graphite cast iron, ultra high strength fiber reinforced concrete, or ultra high strength fiber reinforced mortar can be used. The intermediate member is preferably high-strength reinforced concrete, particularly ultra-high-strength fiber reinforced concrete or ultra-high-strength fiber reinforced mortar from the viewpoints of weight reduction, cost, maintenance, noise / vibration reduction, and the like. The upper and lower surfaces of the concrete intermediate member may be a concrete surface, but it is preferable to provide a sliding plate made of steel, stainless steel, cast iron or the like. As the lower layer member, a steel plate, a stainless steel plate, a cast iron plate, an ultra high strength fiber reinforced concrete, an ultra high strength fiber reinforced mortar plate, or the like can be used. The elastic sealing material can be dry or wet.

  In the invention according to claim 2 of the present invention, a gap is formed in an upper notch space of a bridge joint portion in which a bridge body (bridge girder, abutment) is opposed to each other with a gap at an intermediate portion or an end portion in a bridge axis direction of the bridge. It is a telescopic device installed across the bridge, and is installed across the gap in the upper notch space of the bridge joint part where the bridge body is placed facing the gap in the middle or end in the bridge axis direction of the bridge A pair of flat comb-shaped faceplates with their fingertips engaged with each other with a predetermined gap above the play, and each base plate is fixed to a bridge member facing each other. A surface layer member formed by fixing via (concrete etc.), a lower layer member that forms a stretchable space under the surface layer member by installing a pair of L-shaped members on the bottom surface with a gap between the gaps; Has sliding surfaces up and down It is a beam that is continuous in the direction perpendicular to the bridge axis, and is arranged with an expansion gap on both sides in the bridge axis direction across the gap between the surface layer member and the lower layer member in the expansion space, and the gap is maximized An intermediate member having a wide width in the bridge axis direction that can support the finger portion of the surface layer member even in a state, and an elastic seal member that closes the expansion gap on both sides of the intermediate member. Telescopic device.

  For example, as shown in FIGS. 2 to 4, this is a case of a lateral expansion / contraction device using a flat plate type comb face plate as a surface layer member. On new or existing bridges, it can be installed on-site or a factory-prepared precast unit. In the case of on-site production, the base plate portions of the pair of comb-shaped face plates are fixed to the filling material during on-site punching and integrated with the RC floor slab (see FIG. 3). In the case of factory manufacture, the base end plate portion is fixed to the precast filling material, and this precast filling material is integrated with the RC floor slab by the on-site filling material (see FIG. 4). By using a member having an L-shaped cross section composed of a sliding plate and a rising plate as the lower layer member, an expansion / contraction space can be formed under the surface layer member, and a clogging space can be formed outside thereof.

  In the invention according to claim 3 of the present invention, a gap is formed in the upper notch space of the bridge joint portion in which a bridge body (bridge girder, abutment) is arranged oppositely across the gap at an intermediate portion or an end portion in the bridge axis direction of the bridge. The vertical plate portions of the horizontal plate portions of the pair of L-shaped comb-shaped face plates that are installed across the gaps are engaged with each other with a predetermined gap above the play. And a pair of lower layer members sandwiching a gap constituting the bottom surface of the expansion and contraction space formed below the surface layer member, and a surface layer member fixed to the opposing bridge body via a filler (concrete etc.) The beam is continuous in the direction perpendicular to the bridge axis having a sliding surface above and below, and is arranged with expansion and contraction gaps on both sides in the bridge axis direction across the gap between the surface layer member and the lower layer member in the expansion and contraction space, With the open space fully open An expansion / contraction device for a bridge joint, comprising: an intermediate member having a wide width in a bridge axis direction capable of supporting a finger portion of a surface layer member; and an elastic seal member for closing the expansion / contraction gap on both sides of the intermediate member It is.

  For example, as shown in FIG. 5, this is a case of a vertical expansion / contraction apparatus using an angle type comb-shaped face plate as a surface layer member. On new or existing bridges, it can be installed on-site or a factory-fabricated bleb unit. In either case, the vertical plate portion of the pair of angle type comb-shaped face plates is fixed to the filling material in the spot punching and integrated with the RC floor slab (see FIG. 5). A flat plate can be used as the lower layer member, and the vertical plate portion of the comb-shaped face plate forms an expansion / contraction space, and a clogging space is formed outside thereof.

  The invention according to claim 4 of the present invention is a bridge joint method using the telescopic device according to claim 2, wherein the upper portion is provided by providing a notch at each of the upper portions of the bridge body ends facing each other with a gap between them. A notch space is formed, and a lower layer member having an L-shaped cross section is installed facing each other so as to form an expansion / contraction space on the bottom surfaces on both sides of the play in the central portion in the bridge axis direction of the upper notch space. An intermediate member is installed across the gap in the center in the bridge axis direction in the space, and an elastic seal member is installed in the expansion and contraction gap between the intermediate member and the rising plate of the pair of lower layer members, and then the surface layer member is attached to the intermediate member This is a bridge joint method characterized in that it is installed on the upper part of the upper notch space, and a filling material is placed in the filling space on both sides in the bridge axis direction so that the expansion device and the bridge body are integrated.

  This is a case where a horizontal expansion / contraction device using a flat-plate type comb-shaped face plate as a surface layer member is installed on site (see FIG. 3). Pave on the RC floor slab and complete.

  The invention according to claim 5 of the present invention is a bridge joint method using the expansion and contraction device according to claim 2, and the surface layer member, the intermediate member, the lower layer member, and the elastic seal member are assembled in the mold, The precast expansion / contraction device unit is pre-manufactured by placing a filling material for integrating the base end plate portion and the lower layer member in advance, and the upper end of the bridge body end facing the gap in the field An upper notch space is formed by providing a notch in each of the upper notch spaces, and the precast expansion / contraction device unit is installed in the center of the bridge notch direction in the bridge axial direction so that the intermediate member straddles the gap between the upper notch spaces. This is a bridge joint construction method in which a filling material is placed in a filling space on both sides in the bridge axis direction so that the precast telescopic unit and the bridge body are integrated.

  This is a case where a horizontal expansion / contraction device using a flat-plate type comb-shaped face plate as a surface layer member is used as a precast unit manufactured at a factory, and this is installed in the field (see FIG. 4). Precast units can be manufactured by backlashing. Pave on the RC floor slab and complete.

  The invention according to claim 6 of the present invention is a bridge joint construction method using the expansion device according to claim 3, and is a prefabricated expansion device unit by assembling a surface layer member, an intermediate member, a lower layer member, and an elastic seal member. Is formed in advance, and at the site, an upper notch space is formed by providing a notch at the upper part of the bridge body end facing each other across the gap, and at the center in the bridge axial direction of this upper notch space. The blefab expansion and contraction device unit is installed so that the intermediate member straddles the gap, and the prefab expansion and contraction device unit and the bridge body are integrated by placing a filling material in the clearance space on both sides in the bridge axial direction of the upper notch space. This is a joint method for bridges.

  This is a case where a vertical expansion / contraction device using an angle type comb-shaped face plate as a surface layer member is used as a prefab unit manufactured at a factory, and this is installed in the field (see FIG. 6). The prefab unit can be made upside down. Pave on the RC floor slab and complete.

Since the present invention is configured as described above, the following effects can be obtained.
(1) Since it is a sandwich structure in which an intermediate member made of beam-like concrete is sandwiched between the surface layer member and the lower layer member, it is a relatively simple structure, and the thickness of the surface layer member is large with respect to a large amount of expansion and contraction. It can be made as thin as about 1/4 of a conventional comb-shaped joint, and can easily cope with a large amount of expansion / contraction of a seismic motion level 2 by a relatively simple and low cost expansion / contraction device.
(2) Because the structure is such that the comb-shaped face plate is supported by an intermediate member such as concrete, excellent joint performance such as durability, workability, maintainability, low noise / vibration, and complete waterproofing can be obtained.
(3) Even if the gap is wide, the fingers are supported by the intermediate member, so it can flexibly cope with large deformation movements during a large earthquake, can drive the vehicle, and can be used in the same way as normal during disasters. be able to.
(4) It can be easily constructed at the factory or on site, and the notch dimensions of the main girder are small, so that the workability is good and the cost can be reduced.
(5) In the case of a vertical expansion / contraction device using an angle type comb-shaped face plate, the surface layer member can be shortened compared to the horizontal type, and the amount of asphalt on the pavement increases, resulting in vehicle slipping, etc. This is extremely advantageous and is particularly effective during large deformations during earthquakes. In addition, the overall shape is compact, which is advantageous for transportation and installation from the factory. In addition, the notch of the main girder is further reduced, and there are advantages such as excellent on-site integrity, good workability, low cost, and excellent durability.

  Hereinafter, the present invention will be described based on an embodiment shown in the drawings. This embodiment is an example in which the present invention is applied to a bridge girder and a connecting girder of a bridge girder on an elevated road or a road bridge. The same applies to the connecting joints between the abutment and the bridge girder. It is also applied to the replacement of new bridges and joints of existing bridges. 1 to 4 show an embodiment of a horizontal expansion / contraction apparatus using a flat plate type comb-shaped face plate, and FIGS. 5 and 6 show an embodiment of a vertical expansion / contraction apparatus using an angle type comb-shaped face plate. It is.

  FIG. 1 shows a basic structure of a lateral expansion / contraction device according to the present invention, a perspective view seen from the front side and a perspective view seen obliquely from the side. FIG. 2 is a specific embodiment of the lateral expansion and contraction device of the present invention, and is a plan view and a vertical sectional view at the time of standard time, bridge extension, and bridge contraction (at the time of level 2 earthquake). As shown in FIGS. 1 and 2, the ends of bridge girders such as steel girder slabs and box girders of elevated roads and road bridges are supported by seismic isolation bearings on the piers, and RC (steel reinforced concrete) slabs 1 and RC The floor slab 1 is disposed opposite to the gap 2. An upper notch space 4 is formed by providing shallow notches 3 at the upper portions of the ends of the adjacent RC floor slabs 1, 1, and the horizontal expansion and contraction device 10 according to the present invention is idled in the upper notch space 4. It is installed across two.

  The basic structure of the expansion / contraction device 10 is a sandwich structure in which a wide intermediate member 13 is sandwiched between a surface layer member 11 and a lower layer member 12, and an expansion / contraction space 16 is formed under the surface layer member 11. The elastic seal member 15 closes the expansion / contraction gaps 17 on both sides of the intermediate member 13 arranged in the structure. Various methods can be used to fix the base end portion of the surface layer member 11. For example, the base member 14 is fixed to the filling material 14 on the spot or precast with an anchor, and the filling material 14 is fixed with an anchor, a reinforcing bar, or the like. It is integrated with the RC floor slab 1.

  The surface layer member 11 is a so-called finger joint composed of a pair of flat-plate-type comb-shaped face plates 20, 20. The front-side fingers 20 a, 20 a are engaged with each other with a predetermined gap above the gap 2, and the base end The base plates 20b and 20b on the side are fixed to the RC floor slab 1 by the interstices 14 respectively. The comb-shaped face plate 20 may be a comb-shaped face plate made of steel, stainless steel, cast iron, cast steel, spheroidal graphite cast iron, ultra high strength fiber reinforced concrete, or ultra high strength fiber reinforced mortar. .

  As shown in FIG. 2, the lower layer member 12 is a member having an L-shaped cross section composed of a sliding plate 21 and a rising plate 22, and a pair of lower layer members 12 is installed by facing the bottom surface of the notch 3 with the gap 2 therebetween. The rising plates 22, 22 form the expansion / contraction space 16, and constitute a mold for the filling material 14. Note that FIG. 2 shows a case of factory production, which will be described later, and the filling material 14 is composed of a precast filling material 14a and an on-site filling material 14b. The sliding plate 21 supports the intermediate member 13 slidably in the bridge axis direction. As the lower layer member 12, a steel plate, a stainless steel plate, a cast iron plate, an ultra high strength fiber reinforced concrete plate, or the like can be used.

  The intermediate member 13 is a beam that has a sliding surface in the vertical direction and is continuous in the direction perpendicular to the bridge axis. The intermediate member 13 straddles the gap 2 between the surface layer member 11 and the lower layer member 12 in the expansion / contraction space 16, and the bridge axis. Stretched gaps 17 and 17 are arranged on both sides in the direction, and a wide width is provided in the bridge axis direction that can support the middle part of the pair of comb-shaped face plates 20 and 20 even when the gap 2 is maximized in the event of a large earthquake. Have. The intermediate member 13 is preferably high-strength concrete, particularly ultra-high-strength fiber reinforced concrete or ultra-high-strength fiber reinforced mortar from the viewpoints of weight reduction, cost, maintenance, noise / vibration reduction, and the like. Sliding plates 23 are provided on the upper and lower surfaces of the intermediate member 13 made of concrete, and the comb-shaped face plate 20 is slidably supported so that the intermediate member 13 can slide on the lower layer member 12. As the sliding plate 23, a steel plate, a stainless steel plate, a cast iron plate, ultra high strength fiber reinforced concrete, ultra high strength fiber reinforced mortar, or the like can be used. Moreover, the concrete surface may be left without providing the sliding plate 23.

  An elastic seal member 15 is installed below or above the expansion gap 17. The elastic sealing material 15 is fixed to the side surface of the intermediate member 13 and the inner surface of the filling material 14 by an adhesive or the like, and expands and contracts as the bridge expands and contracts, stops water, and holds the intermediate member 13 in the center. It has a function. The elastic sealing material 15 can be a dry type or a wet type.

  2 (a) and 2 (b) are normal times, that is, standard time, the intermediate meshing portions of the pair of comb face plates 20 and 20 are supported by the intermediate member 13, and the wheel load is applied to the RC floor slab 1 via the intermediate member 13. 1 is transmitted. Since almost the entire surface of the comb-shaped face plate 20 excluding the elastic seal member 15 is supported, the stress can be reduced to, for example, about 25% or less compared to the conventional cantilever type finger joint. The plate thickness can be reduced from, for example, 50 mm to 15 to 20 mm. Further, the water is completely stopped by the elastic seal member 15.

  FIG. 2 (c) shows a state in which the bridge 2 is narrowed due to a temperature change or the like, and the expansion / contraction gap 17 is narrowed and the elastic seal member 15 is contracted. The load is supported and water is stopped as in the standard time.

  FIG. 2 (d) shows a bridge contraction in the event of a large earthquake of seismic motion level 2, and even if the gap 2 is wide open, the fingers 20a, 20a of the pair of comb-shaped face plates 20, 20 are supported by the intermediate member 13, The vehicle can travel in the same way as normal. The extended elastic seal members 15 and 15 can hold the intermediate member 13 at the center position.

  3 and 4 show the construction method of the connecting joint portion using the horizontal expansion and contraction device 10 of the present invention in the order of steps. FIG. 3 shows a case where the expansion / contraction device 10 is manufactured and installed on site, and can be applied to a new installation or an existing bridge. Construction is performed according to the following procedure (see FIG. 3).

  (a) A shallow notch 3 is provided above the ends of the adjacent RC floor slabs 1, 1 to form an upper notch space 4 for installing a telescopic device. The reinforcing bar exposed from the wall surface of the notch 3 is cut to a predetermined length to form a connecting exposed bar 30. Fixing anchor holes 31 are drilled in the bottom surfaces of the notches 3 and 3, and the fixing material 32 is poured into the anchor holes 31.

  (b) A fixing anchor 33 is provided below the sliding plate 21 of the lower layer member 12. The fixing anchor 33 is inserted into the fixing anchor hole 31 and fixed while adjusting the height of the lower layer member 12. . A grout material 34 is placed in the gap between the bottom surface of the notch 3 and the lower layer member 12. A sealing material 35 is disposed at the end facing the gap 2.

  (c) A stretchable space 16 is formed by the pair of lower layer members 12, 12 across the gap 2, and the intermediate member 13 is installed at the center of the stretchable space 16.

  (d) The elastic sealing material 15 is installed in each of the expansion / contraction gaps 17 and 17 formed on both sides of the intermediate member 13. The surface layer member 11 is installed on the intermediate member 13. Concrete 14 as a filling material is placed in the filling space outside the rising plate 22 in the notch 3. A fixing anchor 36 is provided on the outer surface of the rising plate 22 of the lower layer member 12, and a fixing anchor 37 is also provided below the base plate 20 b of each comb-shaped face plate 20, so that the surface layer member 11 and the lower layer member 12 are connected to each other. The concrete 14 is fixed to the concrete 14, and the concrete 14 is integrated with the RC floor slab 1 by the connecting exposed bars 30. The pavement 5 is constructed on the RC floor slab 1 and completed.

  FIG. 4 shows a case where the expansion / contraction device 10 is manufactured in a factory and the precast expansion / contraction device is installed on the site, which can be applied to a new installation or an existing bridge, but is particularly effective for replacement of an existing joint portion. Construction is performed according to the following procedure (see FIG. 4).

  (a) A mold 41 is placed on a production table 40 in a factory, and is manufactured by backlashing. The surface layer member 11, the intermediate member 13, the elastic sealing material 15, and the lower layer member 12 are set in the mold 41 in order from the bottom, and the concrete 14 a serving as a filling material in the gap space between the mold 41 and the lower layer member 12. And precast telescopic device 10 is manufactured. The exposed exposed bars 37 are arranged in the precast concrete 14a.

  (b) At the site, a shallow notch 3 is provided at the upper part of the ends of the RC floor slabs 1 and 1 to form an upper notch space 4 for installing a telescopic device. The reinforcing bar exposed from the wall surface of the notch 3 is cut to a predetermined length to form a connecting exposed bar 30. Fixing anchor holes 31 are drilled in the bottom surfaces of the notches 3 and 3, and the fixing material 32 is poured into the anchor holes 31.

  (c) A temporarily fixed beam member 42 is mounted on the surface layer member 11 of the precast expansion and contraction device 10, arranged at the center of the upper notch space 4, and height-adjusted by the height adjusting bracket 43 of the temporarily fixed beam member 42. Install. A grout material 34 is placed in the gap between the bottom surface of the notch 3 and the lower layer member 12.

  (d) Concrete 14b as a filling material is placed in the filling space formed on both sides of the precast expansion and contraction device 10. The precast concrete 14a is integrated with the RC floor slab 1 by the exposed exposed bars 37, the cast-in-place concrete 14b, and the exposed exposed bars 30. The pavement 5 is constructed on the RC floor slab 1 and completed.

  Next, FIG. 5 is a specific embodiment of the vertical expansion and contraction device of the present invention, and is a plan view and a vertical sectional view at the standard time. The vertical expansion / contraction device 10 shown in FIG. 5 uses an angle-type comb-shaped face plate 25 having an L-shaped cross section instead of the flat-plate-type comb-shaped face plate 20. The comb-shaped face plate 25 having an L-shaped cross section includes a horizontal plate 26 having a finger 26 a at the tip, and a vertical plate 27 perpendicular to the horizontal plate 26. It can be manufactured by built-up by integral molding or welding.

  The stretchable space 16 is formed by a pair of opposed vertical plates 26, 26, and the vertical plate 26 is fixed to the concrete 14 as a filling material by a fixing anchor 36. The same shape, size, material, and the like of the intermediate member 13, the plate-like lower layer member 12, and the elastic sealing material 15 can be the same as those of the flat plate type.

  This vertical type expansion / contraction device can be manufactured and installed in the field in the same manner as the horizontal type, but is suitable for a prefabricated expansion / contraction device. FIG. 6 shows a case in which the vertical expansion and contraction device 10 is manufactured in a factory and the prefabricated expansion and contraction device is installed on the site in the order of processes. This vertical format can also be applied to new or existing bridges, but is particularly effective for replacing existing joints. Construction is performed in the following procedure as in the horizontal format (see FIG. 6).

  (a) In the factory, the intermediate member 13, the elastic sealing material 15, and the lower layer member 12 are sequentially stacked on the surface layer member 11 and integrated to manufacture the prefabricated expansion and contraction device 10. Unlike the horizontal form, it is not necessary to place concrete using a formwork, it can be easily manufactured, and a prefabricated expansion and contraction device having a compact shape can be obtained.

  (b) At the site, a shallow notch 3 is provided at the upper part of the ends of the RC floor slabs 1 and 1 to form an upper notch space 4 for installing a telescopic device. Fixing anchor holes 31 are drilled in the bottom surfaces of the notches 3 and 3, and the fixing material 32 is poured into the anchor holes 31. The notch 3 can be made smaller than in the horizontal format.

  (c) The temporarily fixed beam member 42 is mounted on the surface layer member 11 of the prefabricated telescopic device 10, arranged at the center of the upper notch space 4, and the height is adjusted by the height adjusting bracket 43 of the temporarily fixed beam member 42. Install. A grout material 34 is placed in the gap between the bottom surface of the notch 3 and the lower layer member 12.

  (d) Placing concrete 14 as a filling material in the filling space formed on both sides of the prefabricated expansion and contraction device 10. The surface layer member 11 is integrated with the RC floor slab 1 by the cast-in-place concrete 14, the anchor 36 for fixing, and the exposed reinforcing bars 30 for connection. The pavement 5 is constructed on the RC floor slab 1 and completed.

  This vertical format has the following advantages. That is, the surface layer member 11 can be shortened compared to the horizontal type, and the asphalt portion of the pavement 5 increases, which is extremely advantageous for vehicle slip and the like, and is particularly effective at the time of large deformation during an earthquake. In addition, the overall shape is compact, which is advantageous for transportation and installation from the factory. Further, the notch 3 of the RC floor slab is further reduced, and there are advantages such as excellent on-site integrity, good workability and low cost, and excellent durability. Regarding repair, the horizontal format only requires replacement of the surface layer member, but the vertical format requires more time for field work than the horizontal format because there is a concrete buried part.

It is the basic structure of the horizontal type expansion-contraction apparatus using the flat type comb-shaped face plate of this invention, (a) is the perspective view seen from this side, (b) is the perspective view seen from diagonally side. 1 is a specific embodiment of the telescopic device of FIG. 1, wherein (a) is a plan view, (b), (c), and (d) are during standard time, bridge extension, and bridge contraction (at the time of level 2 earthquake) FIG. It is a vertical sectional view which shows the construction method of the connection joint part using the horizontal-type expansion-contraction apparatus of this invention in order of a process, and is a case where an expansion-contraction apparatus is manufactured and installed in the field. It is a vertical sectional view which shows the construction method of the connection joint part using the horizontal type expansion-contraction apparatus of this invention in order of a process, and is a case where the precast expansion-contraction apparatus manufactured in the factory is installed in the field. It is one Embodiment of the expansion-contraction apparatus of the vertical format using the angle type comb-shaped faceplate of this invention, (a) is a top view, (b) is a vertical sectional view. It is a vertical sectional view which shows the construction method of the connection joint part using the expansion-contraction apparatus of FIG. 5 in order of a process, and is a case where the precast expansion-contraction apparatus manufactured in the factory is installed in the field.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... RC floor slab 2 ... Free space 3 ... Notch 4 ... Upper notch space 5 ... Pavement 10 ... Stretching device 11 ... Surface layer member 12 ... Lower layer member 13 ... Intermediate member 14 ... Filling material (concrete)
DESCRIPTION OF SYMBOLS 14a ... Precast filling material 14b ... On-site filling material 15 ... Elastic sealing member 16 ... Expansion space 17 ... Expansion space 20 ... Flat plate type comb-shaped face plate 20a ... Finger 20b ... Base plate 21 ... Sliding plate 22 ... Rising plate 23 ... Sliding plate 25 ... Angle type comb-shaped face plate 26 ... Horizontal plate part 27 ... Vertical plate part 30 ... Exposed bar for connection 31 ... Fixing anchor bar 32 ... Fixing material 33 ... Fixing anchor 34 ... Grout material 35 ... Seal material 36 ... Anchor for fixing 40 ... Production stand 41 ... Formwork 42 ... Temporary fixing beam 43 ... Height adjusting bracket

Claims (6)

It is a telescopic device that is installed across the gap in the upper notch space of the bridge joint part where the bridge body is placed facing the gap in the middle or end of the bridge axis direction of the bridge,
Between the surface layer member composed of a pair of comb-shaped face plates and a pair of lower layer members installed with a gap between the bottom surfaces of the cutouts, a beam-shaped intermediate member having a sliding surface up and down and continuing in a direction perpendicular to the bridge axis is provided. A bridge joint expansion / contraction device, characterized in that it has a sandwich structure sandwiched, and is configured such that a beam-shaped intermediate member supports a finger portion of a surface layer member with respect to expansion / contraction of the bridge body. It is a telescopic device that is installed across the gap in the upper notch space of the bridge joint part where the bridge body is placed facing the gap in the middle or end of the bridge axis direction of the bridge,
The tip fingers of the pair of flat comb-shaped face plates are engaged with each other with a predetermined gap above the gap, and the base plate portions are fixed to the opposing bridge body via the interstices, respectively. A surface layer member, a lower layer member that forms a stretchable space under the surface layer member by installing a pair of L-shaped members on the bottom surface with a gap between them, and a bridge axis perpendicular direction having a sliding surface above and below Are arranged with gaps on both sides in the bridge axis direction across the gap between the surface layer member and the lower layer member in the expansion and contraction space, and even when the gap is maximized, An expansion / contraction device for a bridge joint, comprising: an intermediate member having a wide width in a bridge axis direction capable of supporting a finger portion; and an elastic seal member for closing the expansion / contraction gap on both sides of the intermediate member. It is a telescopic device that is installed across the gap in the upper notch space of the bridge joint part where the bridge body is placed facing the gap in the middle or end of the bridge axis direction of the bridge,
A pair of L-shaped comb-shaped face plates of the horizontal face plate portion of the horizontal plate portion are engaged with each other with a predetermined gap above the play, and each vertical plate portion is filled with a padding material on the opposing bridge body. A pair of lower layer members sandwiching a gap constituting the bottom surface of the expansion / contraction space formed under the surface layer member, and a beam continuous in a direction perpendicular to the bridge axis having a sliding surface above and below And the gap between the surface layer member and the lower layer member in the expansion / contraction space is arranged with an expansion / contraction gap on both sides in the bridge axis direction to support the finger part of the surface layer member even when the clearance is maximized An expansion / contraction device for a bridge joint, comprising: an intermediate member having a wide width in a possible bridge axis direction; and an elastic seal member for closing the expansion / contraction gap on both sides of the intermediate member.   A bridge joint construction method using the telescopic device according to claim 2, wherein an upper notch space is formed by providing a notch on each of the upper ends of the bridge body facing each other across the gap, and the upper notch A lower layer member having an L-shaped cross section is installed facing each other so as to form a stretchable space on the bottom surface on both sides of the play in the center portion in the bridge axis direction of the space, and an intermediate member is installed in the center portion of the bridge axis direction in the stretch space. Is installed across the gap, and after installing the elastic seal member in the expansion and contraction gap between the intermediate member and the rising plate of the pair of lower layer members, the surface layer member is installed on the intermediate member, and the upper notch space A bridge joint construction method in which filling material is placed in the filling space on both sides in the bridge axis direction to integrate the expansion device and the bridge body.   A bridge joint method using the expansion and contraction device according to claim 2, wherein a surface layer member, an intermediate member, a lower layer member, and an elastic seal member are assembled in a formwork, and the base end plate portion and the lower layer member of the surface layer member are integrated. By pre-fabricating the precast expansion and contraction device unit by placing a filling material to make the upper notch, the upper notch is provided on the site by providing a notch at the upper part of the opposite end of the bridge body across the gap. A space is formed, and the precast telescopic device unit is installed in the middle of the bridge notch space in the bridge axis direction so that the intermediate member straddles the gap. A bridge joint construction method in which a precast telescopic device unit and a bridge body are integrated by placing a material.   It is a bridge joint method using the expansion / contraction device according to claim 3, and a prefab expansion / contraction device unit is manufactured in advance by assembling a surface layer member, an intermediate member, a lower layer member, and an elastic seal member. An upper notch space is formed by providing a notch at each of the upper ends of the bridge body facing each other with an intermediate member interposed between the blefab expansion and contraction device unit at the center of the upper notch space in the bridge axis direction. A bridge joint construction method that is installed so as to straddle, and inserts a filling material in the space between both sides of the bridge notch in the upper notch space to integrate the prefab expansion and contraction device unit and the bridge body.

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