JP2009167596A - Pavement structure of composite pavement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pavement structure capable of preventing the occurrence of a crack and a depression in a surface layer of a composite pavement with a continuous reinforced concrete slab near a viaduct of a bridge. <P>SOLUTION: In this pavement structure, the surface layer (20) is formed on the continuous reinforced concrete slab (10); a bridge abutment side end (11), which is positioned on the abutment (40) side of the continuous reinforced concrete slab (10), is rigidly connected to an expansion device (50) which is installed between the revetment (40) and a girder (60) and which follows the extension of the girder (60). The pavement structure can prevent the occurrence of the crack and the depression in the surface layer by making the expansion device absorb the extension and warpage of the concrete slab, which is caused by a variation in temperature, while the extension is hitherto inhibited by the revetment etc. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pavement structure suitable for reducing cracks and the like caused by temperature changes in composite pavement of a bridge earthwork section.

  Composite pavement is a pavement in which the surface layer made of asphalt mixture is laid on the concrete plate supported by the roadbed, and it has the characteristics of both the structural durability of concrete pavement and the good running and repairability of asphalt pavement. There is.

  As a method of constructing a concrete plate that bears structural durability in this composite pavement, a method of arranging a plurality of PC plates of a predetermined size side by side (hereinafter referred to as a PC plate method), and continuously using a mobile machine Although there is a method of construction (hereinafter referred to as a continuous reinforced concrete method), both methods require measures to absorb the expansion and contraction of the concrete plate caused by temperature changes.

  In general, as a measure for absorbing the expansion and contraction of a concrete plate, a method of closing the joint of the concrete plate with an elastic joint material is known. In this method, the elastic joint material is deformed following the expansion and contraction of the concrete plate, and the expansion and contraction can be absorbed. In the continuous reinforced concrete method, joints as in the PC plate method are not formed. Therefore, in the continuous reinforced concrete method, an expansion joint for absorbing the expansion and contraction is usually formed at the end of the concrete plate (hereinafter referred to as the plate end).

However, the joint that absorbs the expansion and contraction of the concrete plate has a problem that when the surface layer cannot follow the expansion and contraction of the joint, the surface layer is cracked or depressed. Thus, as a means for preventing the occurrence of cracks in the surface layer, for example, a PC plate and a composite paving method disclosed in JP-A-8-49202 (Patent Document 1) have been proposed. The means disclosed in Patent Document 1 is to jointly connect the PC plates and transfer stress between the PC plates, thereby eliminating gaps generated between the PC plates and preventing cracks in the surface layer. is there. In addition, by cutting a slit in the PC plate, it is possible to prevent the occurrence of an unexpected width crack that the surface layer cannot follow.
JP-A-8-49202

  However, the PC plate method has a problem that it takes time and labor to carry in the PC plate manufactured at a place different from the construction site. Therefore, the continuous reinforced concrete slab method is preferable in consideration of the construction period and cost. However, as described above, the expansion joint of the continuous reinforced concrete slab has a problem of generating surface cracks and surface depressions. In particular, in the vicinity of the bridge viaduct, the end of the bridge side is fixed with anchor bolts and the expansion and contraction of the bridge is restricted.

  Then, an object of this invention is to provide the pavement structure which can prevent generation | occurrence | production of the surface crack and surface layer depression of the composite pavement which has a continuous reinforced concrete board | plate near bridge | bridging viaduct.

  The pavement structure according to the present invention is a telescopic device in which a surface layer is formed on a continuous reinforced concrete plate, and the abutment side end of the continuous reinforced concrete plate is installed between the abutment and the girder and follows the extension of the girder. It is rigid.

  The surface layer is a pavement surface formed of asphalt mixture, etc., on the continuous reinforced concrete plate, when it is formed directly on the surface of the continuous reinforced concrete plate, and when it is formed through an intermediate layer to the continuous reinforced concrete plate Both of them shall be included.

  The abutment side end may be supported by a tread plate through a lubricating member. In addition, the lubrication part reduces frictional resistance between the tread plate and the continuous reinforced concrete plate, and for example, a fluororesin processed sheet or a stainless plate is preferable. However, the upper surface of the tread plate and the lower surface of the plate material may be smoothly finished, and the upper surface of the tread plate may be used as a lubrication portion without installing the fluororesin processed sheet or the stainless plate.

  The abutment-side end portion may be rigidly connected to the telescopic device via a connecting member having a gap in the bridge axis direction.

  Both side portions disposed at both ends of the continuous reinforced concrete plate in the bridge width direction may be integrated with a wall rail.

  According to the pavement structure of the present invention, the abutment side end of the continuous reinforced concrete plate (the end located on the abutment side) is installed so as to contact the abutment and is rigidly connected to the joint installed between the abutment and the girder. Therefore, the expansion and warpage of the concrete plate caused by the temperature change, which has been hindered by the abutment and the like, can be absorbed by the expansion / contraction device, and the occurrence of surface cracks and surface depressions can be prevented. Conventionally, the abutment side end of the continuous reinforced concrete plate is fixed to the abutment with an anchor or the like, and the expansion device is rigidly connected to the surface layer on the concrete plate, the abutment side is fixed, and only the girder side is movable. The feature of the present invention is that the abutment side fixing structure of the expansion / contraction device that absorbs the extension of the girder is changed to an operating structure, and the expansion / contraction device is made to follow the extension of the continuous reinforced concrete plate.

  The pavement structure according to the present invention can also be applied to soft soil. When the soil where the abutment is built is soft and a tread plate is installed to prevent the occurrence of subsidence steps, the end of the abutment side of the continuous reinforced concrete plate is supported by the tread plate via the lubrication part To do. According to such a structure, the continuous reinforced concrete plate moves smoothly with respect to the tread plate, and the extension of the continuous reinforced concrete plate caused by the temperature change can be transmitted to the expansion / contraction device.

  The telescopic device of the pavement structure according to the present invention is installed when the pavement is laid, and cannot be replaced with an existing one. However, if the abutment side end of the continuous reinforced concrete plate is rigidly connected to an existing expansion / contraction device via a connecting member having a gap in the direction of the bridge axis, the pavement structure was not determined until the design and construction stage was completed. It can also be applied to bridge viaducts with existing telescopic devices. The connection member used in this case may be, for example, a construction in which a comb-type expansion / contraction device that simply considers movement is constructed on the site with concrete. In particular, it is preferable to use a full support type in which the entire surface is supported by a tread plate. In this case, stress due to bending due to a passing load of the vehicle does not occur, and the thickness can be reduced. However, there are no restrictions on the material and model, and it may be a telescopic device of other structure made of concrete or steel at the factory.

  Moreover, if the both side parts arrange | positioned at the bridge width direction both ends of a concrete plate are united with a wall railing, rain water intrusion under a concrete plate can be prevented and degradation can be aimed at. Conventionally, the earthwork section near the abutment sometimes sunk, but this problem can be solved by making the cross section similar to the bridge section up to the length of the abutment blade wall. However, when the blade wall is already completed, it is preferable to determine it in consideration of cost effectiveness.

  1 and 2 show an embodiment of a pavement structure according to the present invention. FIG. 1 shows a structure in the vicinity of an abutment of a pavement in which the pavement structure is adopted, (a) is a longitudinal sectional view, and (b) is a plan view. FIG. 2 is a cross-sectional view taken along the line AA in FIG.

  This pavement structure is applied to a composite pavement in which a surface layer 20 is formed on a continuous reinforced concrete plate 10.

  The surface layer 20 is formed by laying an asphalt mixture on an intermediate layer 30 formed on the continuous reinforced concrete plate 10. It is preferable that the surface layer 20 has a thickness of about 4 cm and has sufficient slip resistance, fluid resistance, wear resistance, drainage function, load dispersibility, aggregate scattering resistance, and weather resistance.

  The intermediate layer 30 is formed by laying a crushed mastic asphalt mixture on the continuous reinforced concrete plate 10. The mid layer 30 preferably has sufficient fluid resistance, load dispersibility, and water tightness.

  The continuous reinforced concrete plate 10 is constructed and constructed continuously on the upper roadbed 80 using a moving machine. The thickness may be appropriately determined within a range of 20 to 30 cm depending on the installation situation. The abutment side end portion (end portion located on the abutment 40 side) 11 of the continuous reinforced concrete plate 10 is rigidly connected to the expansion device 50.

  The telescopic device 50 is composed of a pair of opposing members 51 and 52 arranged facing each other with a gap 53 therebetween, and is installed between the abutment 40 and the girder 60. And one opposing member 51 arrange | positioned at the abutment 40 side and the other opposing member 52 arrange | positioned at the girder 60 side move relatively, and follow the expansion | extension of the girder 60 by approaching or leaving. It has become. Moreover, the abutment side end portion 11 of the continuous reinforced concrete plate 10 is rigidly connected to the facing member 51 arranged on the end platform 40 side, and follows the extension of the continuous reinforced concrete plate 10. Furthermore, the facing member 51 disposed on the abutment 40 side is supported by a support 41 provided on the abutment 40 and follows movements other than the extension of the girder 60. In addition, as the expansion / contraction apparatus 50, what is called a comb joint is suitable, However There is no restriction | limiting in the structure, You may use another joint suitably. The girder 60 is supported by the abutment 40 via a support 61 and corresponds to movements other than expansion.

  According to this pavement structure, the expansion and contraction device 50 absorbs the extension of the continuous reinforced concrete plate 10 caused by temperature changes, prevents cracks and warpage from occurring in the continuous reinforced concrete plate 10 near the abutment 40, and prevents the surface cracks and surface layers of the composite pavement. The occurrence of depression can be prevented.

  This composite pavement is formed in a bridge earthwork section, and wall height columns 70 continuous from the bridge are erected on both side surfaces in the width direction. The wall height column 70 has a gap 71 at the side of the telescopic device 50, and follows the extension of the girder 60. The clearance 71 is covered with a cover plate 72 for protecting a pipe (not shown) exposed there from rainwater or the like. Since the cover plate 72 is fixed to the wall height column 70 on the abutment 40 side and is covered with the wall height column 70 on the girder 60 side in a relatively movable state, the cover plate 72 can follow the extension of the girder 60. It has become.

  The place where the composite pavement is laid is near a tunnel portion (not shown). And as shown in FIG. 2, the continuous reinforced concrete plate 10 is united with the wall height column 70 in the both sides arrange | positioned at the width direction both ends. Therefore, it is possible to prevent rainwater from entering the lower portion of the concrete plate 10 and to reduce deterioration of the portion. Note that wing walls 73 are formed at both ends in the width direction of the tread plate 42, the upper road bed 80, and the lower road bed 82 that supports the upper road bed 80. The edge is partitioned by an edge cutting material 81. As the edge cutting member 81, a hard foamed vinyl chloride sponge filter is suitable.

  However, the continuous reinforced concrete plate 10 and the wall height column 70 are not necessarily integrated. When the distance between the bridge part and the tunnel part is long and the earthwork section where this composite pavement is laid becomes long, as shown in FIG. 3, it is possible to construct the continuous reinforced concrete plate 10 and the wall rail 70 separately. Above preferred. In this case, it is preferable that the gap formed between the continuous reinforced concrete plate 10 and the wall height column 70 has a structure that does not interfere with the movement of the continuous reinforced concrete plate 10. Moreover, since the part which filled this clearance gap is a part required as a road shoulder, it is preferable to provide the intensity | strength etc. which are required as a road shoulder. In consideration of these points, the composite pavement has a structure in which the gap is formed by asphalt mixture 13 on an upper roadbed 90 formed on the upper roadbed 80 and subjected to a stabilization process. However, as long as the above conditions are satisfied, the material to be laid on the upper layer roadbed 90 does not need to be the asphalt mixture 13, and for example, earth or sand mixed with concrete or solidified material may be used. In FIG. 3, the same reference numerals are given to substantially the same parts as those in FIGS. 1 and 2, and the description thereof is omitted.

  In addition, since a settlement such as consolidation of soil is likely to occur in the vicinity of the abutment part, a tread plate 42 is provided to prevent the occurrence of a settlement step between the abutment 40 and the earthwork part. The tread plate 42 is a rigid plate material, and one edge of the tread plate 42 is disposed on a pedestal 44 formed on the abutment 40 via a buffer material 45. And the upper pavement is supported and the subsidence is suppressed. A lubrication portion 43 is provided on the upper surface of the tread plate 42, and the continuous reinforced concrete plate 10 is supported via the lubrication portion 43. Therefore, even when the continuous reinforced concrete plate 10 is elongated due to a temperature change, the relative movement with the tread plate 42 is smoothly performed, and the elongation is transmitted to the expansion and contraction device 50.

  The embodiment shown in FIGS. 1 and 2 is a case where the composite pavement is constructed in soft soil, but if the soil is solid, there is no need to install a tread board. FIG. 4 and FIG. 5 show an embodiment in the case where the tread plate is not installed. FIG. 4 is a longitudinal sectional view showing a structure in the vicinity of the abutment of the pavement of the example of the pavement in which the pavement structure according to the present invention is adopted and laid on solid soil. FIG. 5 is a cross-sectional view taken along line BB in FIG. 4 and 5, the same reference numerals are given to substantially the same parts as those in FIGS. 1 and 2, and the description thereof is omitted.

  In the composite pavement shown in FIG. 4, the continuous reinforced concrete plate 10 is constructed on the upper roadbed 90 supported by the upper roadbed 80 without a stepping plate being installed between the abutment 40 and the earthwork section. . In addition, when the abutment 40 is constructed on the assumption that the tread plate is installed, a recess is formed as a pedestal 44 for arranging the tread plate. In that case, reinforced concrete for pedestal adjustment is formed. It is preferable to close the recess with 46.

  A wall height column 70 continuous from the bridge is erected on both side surfaces in the width direction, and the continuous reinforced concrete plate 10 is arranged on both side portions arranged at both ends in the width direction as in the embodiment shown in FIGS. 1 and 2. It is united with 70. However, when the distance between the bridge part and the tunnel part is long and the earthwork section where this composite pavement is laid becomes long, as shown in FIG. 6, the continuous reinforced concrete plate 10 and the wall rail 70 may be separated. It is preferable in construction. In this case, the wing walls formed at both ends in the width direction of the upper roadbed 90, the upper roadbed 80, and the lower roadbed 82 may be integrated with the wall height column 70.

  In the composite pavement of the above embodiment, when the pavement is laid, an expansion / contraction device is installed, but this expansion / contraction device cannot be replaced with an existing one. This is because the opposing member disposed on the abutment side of the telescopic device is rigidly integrated with the abutment parapet portion. Therefore, a connecting member is used in the vicinity of the abutment where the telescopic device is already installed. FIG. 7 is a longitudinal sectional view showing an embodiment of the pavement structure according to the present invention, which is adopted in the vicinity of an abutment where an expansion / contraction device has already been installed. In FIG. 7, parts that are substantially the same as those in the embodiment shown in FIGS.

  The plate material 11 installed at the end position of the concrete plate 10 closest to the abutment 40 in this composite pavement is rigidly connected to the existing expansion / contraction device 50 via a connecting member 55 having a gap 56 in the bridge axis direction. ing. In this case, the extension of the continuous reinforced concrete plate 10 caused by the temperature change is absorbed by the play 56 of the connecting member 55, and cracks and warpage occurring in the continuous reinforced concrete plate 10 near the abutment 40 can be prevented.

  The connecting member 55 employs a full-face-supporting comb-type expansion / contraction device that simply considers movement, and can be constructed with concrete on-site. There are no restrictions on the material and type of the connecting member 55, and it may be a telescopic device with other structure made of concrete or steel at the factory, but in the case of a full support type, the entire surface is supported by a tread plate. Therefore, the stress due to bending due to the passing load of the vehicle does not occur, and it can be made thin and economical.

The structure in the abutment vicinity of the Example of the pavement by which the pavement structure based on this invention was employ | adopted is shown, (a) is a longitudinal cross-sectional view, (b) is a top view. It is the cross-sectional view seen along the AA arrow line of FIG.1 (b). It is a cross-sectional view of the site | part equivalent to FIG. 2 in the other Example of the pavement by which the pavement structure which concerns on this invention was employ | adopted. It is a longitudinal cross-sectional view which shows the structure in the vicinity of the abutment of the Example laid in the firm soil of the pavement by which the pavement structure which concerns on this invention was employ | adopted. It is the cross-sectional view seen along the BB arrow line of FIG. It is a cross-sectional view of the site | part equivalent to FIG. 5 in the other Example of the pavement by which the pavement structure which concerns on this invention was employ | adopted. It is a longitudinal cross-sectional view which shows the structure in the vicinity of the abutment of the pavement of the Example using the joint already installed of the pavement by which the pavement structure which concerns on this invention was employ | adopted.

Explanation of symbols

10 Continuous Reinforced Concrete Plate 11 Abutment Side End 13 Asphalt Composite 20 Surface Layer 30 Intermediate Layer 40 Abutment 41 Bearing 42 Tread Plate 43 Lubricating Section 44 Base 45 Buffer Material 46 Reinforced Concrete 50 Stretching Device 51, 52 Opposing Member 53 Spacing 55 Connecting Member 56 Free space 60 Girder 61 Bearing 70 Wall height column 71 Free space 72 Cover plate 73 Wing wall 80 Upper road bed 81 Edge cutting material 82 Lower road bed 90 Upper roadbed

Claims (4)

  A surface layer (20) is formed on the continuous reinforced concrete plate (10), and the abutment side end (11) located on the abutment (40) side of the continuous reinforced concrete plate (10) is connected to the abutment (40) and the girder ( A pavement structure characterized in that the pavement structure is rigidly connected to a telescopic device (50) that is installed between 60) and follows the expansion of the girder (60).   The pavement structure according to claim 1, wherein the abutment side end portion (11) is supported by a tread plate (42) through a lubricating portion (43).   The pavement according to claim 1 or 2, wherein the abutment side end portion (11) is rigidly connected to the telescopic device (50) via a connecting member (55) having a gap (56) in the bridge axis direction. Construction.   The pavement structure according to claim 1, 2, or 3, wherein both side portions disposed at both ends in the width direction of the continuous reinforced concrete plate (10) are integrated with a wall rail (70).

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