JP5964490B1 - Joint structure of concrete floor slab edge in bridge - Google Patents

Abstract

Provided is a joint structure that can appropriately cope with expansion and contraction over a long period of time. A joint structure of a concrete floor slab end in a bridge is formed at an upper part of a gap 3 formed between the ends of the concrete floor slabs 1 and 2 or between a concrete floor slab 1 end and an abutment 2 '. A stepped portion 5 is formed, joint layers 8 and 9 are formed by covering the asphalt composite material 7 having elasticity in the stepped portion 5 with a covering sheet, and a pavement material is placed on the joint layer to form a surface layer. 14 is formed. [Selection] Figure 4

Description

  The present invention relates to a joint structure of a concrete slab end in a bridge such as a river bridge, an overpass, a viaduct or the like.

  In general, as shown in FIG. 1, the gap 3 formed between the ends of the concrete slab 1 or 2, or the upper part of the gap 3 formed between the end of the concrete slab 1 and the abutment 2 ′ is called a finger joint. A structure in which an unconnected joint 4 for meshing the corrugated plate 4a is embedded and the expansion and contraction in the gap 3 is freely made within the range of the meshing interval of the corrugated plate 4a is mainly used.

  However, when the concrete around the finger joint is worn, the finger joint protrudes on the road surface, and the protruding finger joint has a problem of inducing noise and vibration by the traveling vehicle.

  Therefore, the following Patent Documents 1 and 2 describe a joint structure that eliminates the finger joint as a stepped portion at the upper part of the gap formed between the ends of the concrete slab or between the ends of the concrete slab and the abutment. And a structure in which an elastic joint is formed by placing a highly stretchable filler in the stepped portion.

  That is, the following Patent Documents 1 and 2 form an elastic joint part by filling the stepped part with a highly elastic pavement material or a high elastic cement mortar, and thus an elastic joint part integrated with a concrete floor slab end or an abutment. The joint structure which absorbs the expansion and contraction of the play is disclosed.

Japanese Patent No. 2923586 JP 2011-162981 A

  The high elastic pavement material or the high elastic cement mortar constituting the elastic joint part of Patent Literatures 1 and 2 above can be adapted to expansion and contraction due to elasticity and elasticity, but the bone by the binder due to repeated load due to running of the vehicle. There is a problem that the bonding of the material is released and the material is crushed.

  That is, each conventional invention employs a joint structure in which a highly stretchable pavement material or a highly elastic cement mortar is placed instead of a finger joint. The joint structure has a problem that the high elastic cement mortar collapses.

  The present invention does not adopt a joint structure in which a pavement material or cement mortar is simply placed in a stepped portion like the conventional joint joint described above, and restrains the asphalt mixture with a sheet, thereby restricting the inside of the asphalt mixture. A joint structure in which a joint layer that complements the bond between the binder and the aggregate is arranged in the stepped-down portion is employed to effectively prevent crushing.

  In short, the present invention forms a stepped portion in the upper part of the gap formed between the ends of the concrete slab or between the edge of the concrete slab and the abutment, and has elasticity in the stepped part. Form a single layer structure or a laminated structure of a joint layer in which asphalt mixture is covered with a covering sheet, and place a pavement material on the joint layer of the single layer structure or on the uppermost joint layer of the laminated structure. Provided is a joint structure that has a structure that forms a surface layer, and that appropriately responds to repeated loads due to vehicle travel while flexibly responding to expansion and contraction between play.

  Preferably, the asphalt mixture is a mixture obtained by heating and melting butyl rubber or ethylene propylene rubber and asphalt as a main material, and an asphalt mixture in which known aggregates and fillers are mixed is used for easy deformation. The above-mentioned joint layer is formed.

  Moreover, as the pavement material constituting the surface layer, it is desirable to use the same highly elastic asphalt mixture as the asphalt mixture constituting the joint layer.

  Moreover, the surface used as the outer surface of the said joint layer of the said covering sheet is made into an adhesive surface, and the said joint layer which follows appropriately the bottom face and inner wall surface of the said step-down part is formed. Preferably, the adhesive surface is formed of a mixture obtained by heating and melting butyl rubber or ethylene propylene rubber and asphalt as main materials.

Moreover, the enveloping surface encapsulating the asphalt mixture of the covering sheet formed of textiles sheets by the fibers constituting the fiber sheet to improve the binding property between asphalt mixture.

  In the present invention, the expansion and contraction of the looseness is achieved by the cooperation of a non-joint joint structure composed of a single layer structure or a laminated structure of a joint layer in which an asphalt composite material is covered with a covering sheet, and a surface layer provided on the non-joint joint structure. It is possible to realize a joint structure that is flexible and does not collapse, and can be used for a long period of time.

(A) is a pair of concrete floor slabs that are adjacent to each other through a gap in an existing bridge, or a perspective view that outlines a part of a concrete floor slab and an abutment that are adjacent via a gap, and (B) is the above The bridge length direction sectional view which shows the state which formed the step part in the upper part of the gap. (A) is a bridge length direction sectional view showing a state in which a covering sheet is laid on a waterproof sheet laid in a stepped portion and an asphalt mixture is placed on the covering sheet, and (B) is placed. The bridge length direction sectional view which shows the state which covered the asphalt compound material with the covering sheet | seat, and formed the joint layer. (A) is a bridge length direction sectional view showing a state in which a covering sheet is further laid on the joint layer and the asphalt mixture is placed on the covering sheet, and (B) is a view of covering the placed asphalt mixture. The bridge length direction sectional view which shows the state which covered the sheet | seat and formed the two-layered joint layer. The bridge length direction sectional view showing the joint structure concerning the present invention. The bridge length direction sectional view showing other examples of the joint structure concerning the present invention. The bridge width direction sectional view showing the joint structure concerning the present invention. (A) is the perspective view which cuts and shows a covering sheet partially, (B) is the same sectional drawing. (A) is the perspective view which cuts off the other example of the covering sheet, and (B) is the sectional drawing. (A) is the perspective view which cuts off the other example of the covering sheet, and (B) is the sectional drawing.

  The best mode of the joint structure of the concrete floor slab end in the bridge according to the present invention will be described below with reference to FIGS.

<Basic structure>
As shown in FIGS. 4 to 6, the joint structure according to the present invention is basically formed between the free space 3 formed between the ends of the concrete slabs 1 and 2 or between the one end of the concrete slab and the abutment 2 '. Forming a stepped portion 5 on the upper part of the gap 3 formed, and forming a laminated structure of joint layers 8 and 9 in which an elastic asphalt mixture 7 is covered with a covering sheet 6 in the stepped portion 5; It has a basic structure in which a pavement material is placed on the uppermost joint layer 9 of the laminated structure to form a surface layer 14.

  In this embodiment, a laminated structure composed of the joint layer 8 and the joint layer 9 will be described. However, the present invention is not limited to this, and in the case of a single-layer structure composed of one joint layer, three layers are used. It does not exclude the case of a laminated structure consisting of more than one joint layer. In any case, a joint layer structure in which the asphalt composite material 7 having elasticity is covered with the covering sheet 6 is formed, and the expansion and contraction of the gap 3 is appropriately handled by the joint layer structure. In the following, description will be given in order.

  FIG. 1 (A) shows an existing bridge with an unconnected joint at the top of the gap 3 formed between the ends of the concrete slabs 1 and 2 or between the end of the concrete slab 1 and the abutment 2 ′. It is the perspective view which partially outlined the state where a certain finger joint is embed | buried, and was outlined. In the figure, reference numeral 15 denotes a pavement formed by a pavement material such as asphalt mixture on the concrete floor slabs 1 and 2 or the abutment 2 '.

  When the joint structure according to the present invention is applied to the existing bridge, first, the finger joint 4 is removed together with the surrounding mounting portion concrete, and as shown in FIG. A stepped portion 5 is formed.

  Further, when the joint structure according to the present invention is implemented on a new bridge, as shown in FIG. 1 (B), the upper part of the concrete floor slab 1, 2 or the floor slab end of the concrete floor slab 1 and the abutment 2 A stepped portion 5 is previously formed on the upper part of each of ′, or the upper part of the concrete slab 1 and 2 ends, or the upper part of the floor slab end of the concrete floor slab 1 and the abutment 2 ′ are ground on the site. The drop part 5 is formed.

  In this application, the concrete floor slabs 1 and 2 are concrete floor slabs formed by cast-in-place concrete, PC concrete floor slabs formed at the factory, or steel girders (H-shaped steel girders etc.) and cast concrete floor slabs. Alternatively, all concrete floor slabs in composite bridges and the like molded with PC concrete floor slabs are included.

  Next, as shown in FIG. 2 (A), first, a waterproof sheet 16 is laid on the bottom surface 5a of the stepped portion 5, and a part of the waterproof sheet 16 is suspended in the play gap 3 to form a suspended portion 16c. Intrusion of rain water or the like into the gap 3 by the hanging portion 16c, particularly the rising surfaces 1a and 2a of the concrete floor slabs 1 and 2 constituting the gap 3 or the rising surface 2'a of the abutment 2 'is exposed to rain water or the like. Properly prevent

  Then, the covering sheet 6 is laid on the waterproof sheet 16, and the asphalt composite material 7 having elasticity is placed on the covering sheet 6, and as shown in FIG. The free end portions 6c, 6d of the covering sheet 6 are folded over the material 7 so that the asphalt composite material 7 placed is covered with the covering sheet 6 and cured to form a stepped portion. A joint layer 8 is formed in 5.

  As will be described later, the covering sheet 6 has one surface 6a that becomes the outer surface 8a of the joint layer 8 as an adhesive surface and the other surface 6b that covers the asphalt composite material 7 as a rough surface. One surface 6a is in close contact with the surface 16b of the waterproof sheet 16 laid on the bottom surface 5a of the stepped portion 5, and the other surface 6b which is the rough surface is firmly bonded to the asphalt mixture 7 to be covered. Then, the joint layer 8 is formed. Further, by covering the asphalt composite material 7 by overlapping the free end portions 6c and 6d of the covering sheet 6, the other surface of the free end portions 6c and 6d which is the adhesive surface is a rough surface. Adhering to 6b, the asphalt mixture 7 is surely covered.

  Further, as shown in FIG. 6, the left and right ends of the joint layer 8 in the bridge width direction are covered with the end covering sheet 6 ′ having the same configuration as the covering sheet 6, and the asphalt mixture 7 flows out. Properly prevent In the present embodiment, the configuration is shown in which the end covering sheet 6 'covers the left and right end portions of the joint layer 8 in the bridge width direction. However, the present invention is not limited to this, for example, the bridge length direction and the bridge width. It is not excluded to form the joint layer 8 so as to wrap the asphalt composite material 7 with the covering sheet 6 having folding margins in each direction.

  In this embodiment, as shown in FIG. 3A, a new covering sheet 6 is further laid on the joint layer 8 and has elasticity similar to the joint layer 8 on the covering sheet 6. Asphalt composite material 7 is placed, and as shown in FIG. 3B, the placed asphalt composite material 7 is covered and a joint layer 9 is laminated on the joint layer 8. Both the outer surface 8a of the joint layer 8 and the outer surface 9a of the joint layer 9 are constituted by the adhesive surface 6a of the covering sheet 6, and both are in close contact with each other in the vertical direction. Since the structure of the joint layer 9 is the same as that of the joint layer 8 described above, description thereof is omitted here.

  Finally, as shown in FIG. 4, a pavement material is cast on the joint layer 9 to form the surface layer 14. The surface layer 14 is integrated with the pavement 15 formed on the concrete floor slabs 1 and 2 or the abutment 2 '. The pavement material constituting the surface layer 14 is formed using the same asphalt mixture as the asphalt mixture 7 constituting the joint layers 8 and 9 so as to be deformed following the deformation of the joint layers 8 and 9. Is desirable.

FIG. 5 shows another example of the joint structure according to the present invention in which the waterproof sheet 16 is omitted.
That is, the covering sheet 6 is directly laid on the bottom surface 5a of the stepped portion 5 to form the joint layer 8 described above, and the joint layer 9 described above is formed on the joint layer 8, The structural example which forms the surface layer 14 is shown.

  In the case of this structural example, preferably, when the covering sheet 6 is laid in the stepped-down portion 5, a part of the covering sheet 6 is suspended in the gap 3 to form a suspended portion 6e, The asphalt mixture 7 is also cast in the hanging portion 6 e and hardened to form the protruding portion 8 b in the joint layer 8. Intrusion of rainwater or the like into the gap 3 by the protrusion 8b, in particular, the rising surfaces 1a and 2a of the concrete floor slabs 1 and 2 constituting the gap 3 or the rising surface 2'a of the abutment 2 'is exposed to rainwater or the like. Appropriately prevent

  In the joint structure according to the present invention, as described above, the asphalt composite material 7 having elasticity is constrained by the covering sheet 6, whereby the binder sheet 6 and the aggregate in the asphalt composite material 7 are bound by the covering sheet 6. Joint layers 8 and 9 that appropriately absorb the expansion and contraction of the gap 3 while complementing the coupling are provided in the stepped portion 5. The joint layers 8 and 9 cooperate with the surface layer 14 to provide a joint structure that does not interfere with vehicle travel while appropriately responding to expansion and contraction of the gap 3.

<Asphalt mixture 7>
Here, the asphalt composite material 7 having elasticity, which constitutes the joint layers 8 and 9 described above, will be described. The asphalt mixture 7 is preferably an asphalt mixture in which butyl rubber or ethylene propylene rubber and asphalt as a main material and heated and melted are used as a binder, and a known aggregate or filler is mixed, so that deformation is easy. The joint layers 8 and 9 having elasticity are formed. Moreover, a process oil is mix | blended with the said binder as needed.

  A preferable blending example of the asphalt mixture 7 is as follows, and the blending ratio of the binder (a mixture mainly composed of butyl rubber or ethylene propylene rubber and asphalt) and the aggregate is 26 to 2:74 by weight. ~ 98.

<Formulation example 1>
Butyl rubber or ethylene propylene rubber 20-200 kg / m ³
Process oil 10-100kg / m ³
Asphalt 20-200kg / m ³
Aggregate (sand and gravel) 1400-2400 kg / m ³

<Formulation example 2>
Butyl rubber or ethylene propylene rubber 25-250 kg / m ³
Asphalt 25-250kg / m ³
Aggregate (sand and gravel) 1400-2400 kg / m ³

  In the present invention, as described above, it is desirable to use the asphalt mixture 7 as a pavement material constituting the surface layer 14 and to make the surface layer 14 follow the deformation of the joint layers 8 and 9. The surface layer 14 is limited to a part on the joint layer, and can be easily removed even if it deteriorates over time, and can be easily established.

<Enveloping sheet 6 (end covering sheet 6 '), waterproof sheet 16>
Further, as shown in FIG. 7, the covering sheet 6 according to the present invention includes an adhesive surface on one surface 6 a that becomes the outer surfaces 8 a and 9 a of the joint layers 8 and 9 and encloses the asphalt mixture 7. The other surface 6b to be covered is a rough surface, and the one surface 6a as the adhesive surface is in close contact with the bottom surface 5a, the side surface 5b of the stepped portion 5 or the surface 16b of the waterproof sheet 16, and the other surface 6b as the rough surface. Is firmly bonded to the asphalt mixture 7 to be covered.

  The pressure-sensitive adhesive surface 6a is formed of the pressure-sensitive adhesive material 10, and is formed of, for example, the pressure-sensitive adhesive material 10 made of a mixture obtained by heating and melting butyl rubber or ethylene propylene rubber and asphalt as the main material in the same manner as the binder of the asphalt mixture 7. In addition, since the pressure-sensitive adhesive material 10 is soft and easily deformed, it is desirable that a net sheet 11 knitted with known aramid fibers, nylon fibers, carbon fibers or the like is embedded in the mixture for shape retention and reinforcement.

  Moreover, the other surface 6b used as the covering surface of the said covering sheet 6 is formed as a rough surface with the fiber sheet 12 which consists of nonwoven fabrics, for example. The fibers constituting the fiber sheet 12 are embedded in the asphalt mixture 7 and the gaps between the fibers of the fiber sheet 12 are impregnated with the components of the asphalt mixture 7 so that the fiber sheet 12 and the asphalt mixture are impregnated. 7 is firmly bonded.

  In addition, in order to prevent the adhesive sheet 10 from being impregnated into the fiber sheet 12, a synthetic resin sheet 13 made of a synthetic resin such as polyvinyl chloride is disposed therebetween.

  If necessary, a primer is applied to the other surface (rough surface) 6b of the covering sheet 6 to perform primer treatment, and bonding with the asphalt mixture 7 and adhesion between the free ends 6c and 6d. Make it stronger. The primer is preferably a mixture obtained by heating and melting butyl rubber or ethylene propylene rubber and asphalt as a main material, that is, a liquid containing the same components as the binder in the asphalt mixture 7. In addition, it is optional to use a known organic paint as the undercoat.

  Further, the end covering sheet 6 ′ used at the left and right ends of the joint layers 8 and 9 in the bridge width direction has the same configuration as the above covering sheet 6.

  Further, it is desirable to use a sheet having the same configuration as the covering sheet 6 as the waterproof sheet 16. In this case, the back surface 16a of the waterproof sheet 16 is an adhesive surface, the front surface 16b is a rough surface, and the back surface 16a is closely adhered to the bottom surface 5a of the stepped portion 5 along a concavo-convex shape, and the surface 16b is bonded to the joint layer. 8 is reliably brought into close contact with the outer surface 8a (one surface 6a of the covering sheet 6).

  8 and 9 show other examples of the covering sheet 6. The covering sheet 6 shown in FIG. 8 is composed of the adhesive material 10 and a net sheet 11 embedded in the adhesive material 10, and the other surface 6b is roughened like the covering sheet 6 shown in FIG. The adhesive surface is similar to the one surface 6a. 9 includes the adhesive material 10, the net sheet 11 embedded in the adhesive material 10, and the synthetic resin sheet 13 in close contact with the adhesive material 10. The envelope sheet 6 shown in FIG. Unlike the sheet 6, the other surface 6 b is not a rough surface, but is formed of a synthetic resin sheet 13. In any case, the covering sheet 6 in these examples has one surface 6a as an adhesive surface, is in close contact with the bottom surface 5a and the side surface 5b of the stepped portion 5, and constitutes the outer surfaces 8a and 9a of the joint layers 8 and 9. The two layers are in close contact.

  Of course, sheets having the same configuration as the covering sheet 6 in the examples of FIGS. 8 and 9 can be used as the end covering sheet 6 ′ and the waterproof sheet 16.

  As described above, in the joint structure according to the present invention, the joint layers 8 and 9 formed by covering the asphalt mixture 7 having elasticity with the covering sheet 6, and the asphalt mixture having elasticity similarly 7, it is possible to appropriately cope with the expansion and contraction of the gap 3 by cooperation with the surface layer 14 formed on the joint layer 9 and integrated with the pavement 15.

  More specifically, the joint layers 8 and 9 have elasticity and high flexibility by the asphalt composite material 7 constituting the joint layers 8 and 9, but are simultaneously covered with the covering sheet 6. Deformation is limited to some extent by the covering sheet 6, in particular, the net sheet 11, the fiber sheet 12, and the synthetic resin sheet 13 in the adhesive material 10 constituting the covering sheet 6.

  Therefore, the joint layers 8 and 9 are slightly thinner than usual when the gap 3 is open and extend in the bridge length direction, and conversely slightly thicker when the gap 3 is clogged. At the same time, it is reduced in the bridge length direction, and the concrete floor slabs 1 and 2 or the concrete floor slab 1 and the abutment 2 ′ are appropriately relayed appropriately while absorbing the expansion and contraction of the gap 3.

  Further, the asphalt mixture 7 constituting the joint layers 8 and 9 is constrained by the covering sheet 6 and the bonding between the binder and the aggregate in the asphalt mixture 7 is complemented. Thereby, the joint layers 8 and 9 can be used as a joint for a long time without being crushed.

  The surface layer 14 itself has elasticity and follows the deformation of the joint layers 8 and 9.

  In the present application, the numerical range indicated by “˜” between the lower limit value and the upper limit value represents all the numerical values (integer value and decimal value) between the lower limit value and the upper limit value.

DESCRIPTION OF SYMBOLS 1, 2 ... Concrete floor slab, 2 '... Abutment, 1a, 2a, 2'a ... Rising surface, 3 ... Slack, 4 ... Finger joint, 4a ... Corrugated plate, 5 ... Stepped part, 5a ... Bottom, 5b ... Side surface, 6 ... covering sheet, 6a ... one surface, 6b ... other surface, 6c, 6d ... free end portion, 6e ... hanging portion, 6 '... end covering sheet, 7 ... asphalt composite, 8 DESCRIPTION OF SYMBOLS ... Joint layer, 8a ... Outer surface, 8b ... Projection part, 9 ... Joint layer, 9a ... Outer surface, 10 ... Adhesive material, 11 ... Net sheet, 12 ... Fiber sheet, 13 ... Synthetic resin sheet, 14 ... Surface layer 15 ... pavement part, 16 ... waterproof sheet, 16a ... back surface, 16b ... front surface, 16c ... hanging part.

Claims (6)

  A stepped portion is formed at the upper part of the gap formed between the ends of the concrete slab or between the edge of the concrete slab and the abutment, and an elastic asphalt mixture is formed in the stepped portion with a covering sheet. A single-layer structure or a laminated structure of the encased joint layer is formed, and a pavement material is placed on the joint layer of the single-layer structure or on the uppermost joint layer of the laminated structure to form a surface layer. The joint structure of the concrete slab edge in the bridge.   The joint structure of a concrete floor slab end in a bridge according to claim 1, wherein the asphalt mixture is an asphalt mixture using as a binder a mixture obtained by heating and melting butyl rubber or ethylene propylene rubber and asphalt as main materials.   The joint structure of a concrete floor slab end in a bridge according to claim 1 or 2, wherein the same asphalt composite material as the asphalt composite material constituting the joint layer is used as the pavement material constituting the surface layer.   The joint structure of a concrete floor slab end in a bridge according to any one of claims 1 to 3, wherein a surface which is an outer surface of the joint layer of the covering sheet is an adhesive surface.   5. The concrete floor slab edge in a bridge according to claim 1, wherein the adhesive surface of the covering sheet is formed of a mixture obtained by heating and melting butyl rubber or ethylene propylene rubber and asphalt as main materials. Joint structure. The joint structure of a concrete floor slab end in a bridge according to any one of claims 1 to 5, wherein a covering surface of the covering sheet is formed of a fiber sheet.

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