JP3720003B2 - Buried joints for road bridge buried joints and buried bridge joints for road bridges - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a buried joint for a buried joint of a road bridge and a buried joint of a road bridge.
[0002]
[Prior art]
The buried joint is mainly applied to a road bridge having a relatively small amount of expansion and contraction, and is known to absorb expansion and contraction of the main body of the road bridge by deformation of a paved material continuously paved. Its basic structure is shown in FIG. That is, on both sides of the road bridge gap a, a step c is formed at the end of the road bridge body b, and the joint material d is packed in the gap a, and on the steps c and c so as to cover the joint material d. An elastic compound e is placed, a waterproof sheet f is laid thereon, and a pavement g is applied thereon.
[0003]
Japanese Examined Patent Publication No. 60-39801 describes that a prefabricated pavement member manufactured in a factory is buried under continuous pavement without using the above-described elastic compound for the buried joint. In this prefabricated pavement member, a pavement material layer is provided in the upper layer, and a pair of support plates separated from each other with a gap between them are provided in the lower layer. It is designed to be fixed to the main road bridge.
[0004]
Japanese Examined Patent Publication No. 60-9605 describes that a buried joint formed by bonding a rubber plate and a steel plate is buried under the pavement of a buried joint. That is, this buried joint is provided with a single steel plate in the upper layer and a pair of rubber plates separated in the left and right in the lower layer. It is designed to be fixed to the bridge body.
[0005]
[Problems to be solved by the invention]
According to the above-mentioned buried type joint, the pavement is continuous without interruption at the road bridge joint part, so that the running performance of the automobile is good and vibration and noise are reduced, but the pavement is wavy due to the flow of the elastic compound e. There is a problem that the pavement on the gap is likely to be cracked due to the relative vertical displacement of the road bridge body facing the gap and the expansion and contraction of the road bridge body. Since this crack extends in the longitudinal direction of the play (in the direction intersecting the bridge axis), the traveling performance of the automobile deteriorates. In addition, the pavement is chipped from the crack due to the impact of passing through the car, and the crack gradually becomes a large groove, driving performance worsens, noise and vibration increase, and driving safety is also impaired. Come.
[0006]
Further, since the elastic compound e is formed of a mixture of rubber, asphalt and crushed stone, the road bridge body has poor stretch absorbability and stress dispersibility. In construction, the necessary amount of solid rubber and asphalt (or sheet-shaped rubber-filled asphalt) is first heated and dissolved in a dissolution tank, and this dissolved material is further added to a mixer together with crushed stones and mixed again by heating. It is necessary, and the preparation at the site is large and troublesome, and it takes time and effort. In addition, even after the placement on the step c, the waterproof sheet f cannot be constructed and paved g until the elastic compound e is cooled and solidified. For this reason, construction time becomes longer, and construction cannot be completed by only one night construction or daytime construction, construction is interrupted in the early morning or evening, and asphalt mixture is temporarily packed for the pavement thickness. Then, the lining board is put on the road bridge joint part and temporarily restored (to enable road traffic), and the next night or noon will have to be continued. Therefore, the time for traffic regulation for construction is doubled and costs increase, and traffic safety is hindered.
[0007]
On the other hand, if the prefabricated paving member described in Japanese Patent Publication No. 60-39801 is used, the problem of the elastic compound is solved, but the paving material layer of the paving member is the same as the elastic compound. There is almost no elasticity. For this reason, when the free space expands or contracts due to expansion and contraction of the main body of the road bridge, there is a problem that a crack is generated in the pavement material layer between the left and right support plates, and this crack spreads to the pavement on the pavement member.
[0008]
Moreover, in the case of the embedded joint which consists of a pair of rubber plate and steel plate described in Japanese Patent Publication No. 60-9605, the rubber plate allows expansion and contraction of the road bridge body, but the steel plate hinders the expansion and contraction of the road bridge body. There is a problem that cracks occur in the pavement on both sides of the steel plate.
[0009]
The subject of this invention is suppressing the generation | occurrence | production of the crack of the said pavement in such an embedded type joint.
[0010]
Another object of the present invention is to make it possible to apply the buried joint to a road bridge with a large amount of expansion and contraction that has not been considered to be applied so far.
[0011]
[Means for Solving the Problems]
In the present invention, in constructing an embedded joint by laminating rubber and a rigid plate such as a steel plate, the rubber is continued in the bridge axis direction while the rigid plate is not aligned in the bridge axis direction. By making it continuous, the stretchability in the direction of the bridge axis was improved without impairing the load supportability.
[0012]
That is, the invention according to claim 1 is a road bridge that is constructed so as to straddle the road bridge main body on both sides of the freeway of the road bridge joint part or between the road bridge main body and the abutment on both sides of the freeway, and buried under the pavement. An embedded joint for an embedded joint,
A rubber layer provided on the road bridge body on both sides of the play or on the road bridge body and the abutment on both sides of the play,
A plurality of upper rigid lateral plates fixed to the upper surface of the rubber layer and spaced apart in the bridge axis direction;
A plurality of intermediate rigid lateral plates embedded in the middle of the rubber layer and spaced apart in the bridge axis direction;
The rubber of the rubber layer is clogged in the gap between the plurality of upper rigid lateral plates,
The upper rigid lateral plate is disposed between the plates of the intermediate rigid lateral plate.
[0013]
Therefore, since the buried joint is formed by laminating rubber and a rigid horizontal plate, it has a high load bearing capacity and does not plastically flow. It is prevented from occurring. In addition, the expansion / contraction deformation of the play due to expansion and contraction of the road bridge body and the relative vertical displacement between the road bridge bodies (or between the road bridge body and the abutment) are absorbed by the elastic deformation of the buried joint, and the road Large stress is prevented from acting on the pavement of the bridge joint.
[0014]
Thus, an important point in the present invention is that a plurality of rigid lateral plates and rubbers which are provided at intervals in the bridge axis direction are laminated, so that along the deformation of the rubber layer, in the bridge axis direction. This is a point in which the rigid horizontal plates adjacent to each other are displaced relatively.
[0015]
That is, if there is only one rigid lateral plate, the rubber layer provided thereunder will only cause shear deformation. However, in the present invention, a plurality of rigid lateral plates are spaced in the direction of the bridge axis. Therefore, the elastic deformation of the rubber layer is allowed between the plates, and the adjacent rigid lateral plates can be relatively displaced up and down. In addition, the deformation of the rubber layer between the plates of a plurality of rigid lateral plates is allowed because the stress generated at the road bridge joints due to the expansion and contraction of the road bridge body is not only between the two sides of the buried joint but also between the plates. It is also dispersed in the part of. That is, the dispersibility of stress is high.
[0016]
In particular, the combination of the upper rigid lateral plate and the intermediate rigid lateral plate provides a high load bearing capacity, which is advantageous in supporting the wheel load of a passing vehicle. Moreover, each of the intermediate rigid horizontal plates and the upper rigid horizontal plates becomes a stress distribution location, so the dispersibility is high, and a large stress is locally applied to the road bridge joint pavement. It is prevented from acting and is therefore advantageous in preventing cracks in the pavement.
[0017]
In addition, it does not require the work of heating and mixing in the field like conventional elastic compounds, and since construction can be started immediately after construction of buried joints, construction can be completed in a short time. This is advantageous for preventing traffic accidents and reducing construction costs.
[0018]
Although the number of the rigid horizontal plates provided at intervals in the bridge axis direction may be two, it is preferable to arrange three or more in parallel.
[0019]
In the invention according to claim 2, a stepped portion that is lower than the upper surface of the road bridge main body is formed on the road bridge main body on both sides of the freeway of the road bridge joint portion, or on the road bridge main body and the abutment on both sides of the freeway,
The buried joint according to claim 1 is constructed so as to straddle the step portions on both sides of the play,
A buried bridge joint for a road bridge, characterized in that continuous pavement is provided on the buried joint.
[0020]
Therefore, according to the present invention, as is apparent from the description of the invention according to claim 1, it is advantageous in preventing cracks and irregularities from occurring on the pavement.
[0021]
The invention according to claim 3 is formed on the road bridge main body on both sides of the gap of the road bridge joint portion, or on the road bridge main body and the abutment on both sides of the gap between the upper surface of the road bridge main body,
The buried joint according to claim 1 is constructed so as to straddle the step portions on both sides of the play,
Under the buried joint, an expansion joint that allows expansion and contraction of the road bridge body and supports the buried joint from below on the gap is provided,
A buried bridge joint for a road bridge, characterized in that continuous pavement is provided on the buried joint.
[0022]
Accordingly, in the case of the present invention, since the buried joint is supported on the gap by the expansion joint, even when the gap is wide, the buried joint is prevented from falling into the gap, and when applied to a road bridge with a large expansion / contraction amount. Become advantageous.
[0023]
【The invention's effect】
As described above, according to the first to third aspects of the present invention, a plurality of upper rigid lateral plates fixed to the upper surface of the rubber layer and provided at intervals in the bridge axis direction, and the middle of the rubber layer. A plurality of intermediate rigid lateral plates embedded and spaced apart in the bridge axis direction, and a gap between the plurality of upper rigid lateral plates is filled with rubber of the rubber layer, Since the above-mentioned rigid horizontal plate is arranged between the plates, the road load of the passing vehicle is supported by the rigid horizontal plate, and it is possible to prevent the pavement from sinking into the pavement and the pavement wavy, and the road bridge body The expansion / contraction deformation of the play due to the expansion and contraction of the bridge and the relative vertical displacement between the road bridge bodies (or between the road bridge body and the abutment) are efficiently absorbed by the deformation of the buried joint, especially with the expansion and contraction of the road bridge body Live at the road bridge joint That stress dispersibility becomes high, and becomes advantageous for the cracks in the pavement of the road bridge seam portion is prevented from occurring, moreover, it is possible to significantly reduce the construction time.
[0024]
According to the third aspect of the present invention, since the buried joint is supported by the expansion joint in the play, it is advantageous when applied to a road bridge with a large expansion / contraction amount.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0026]
<Embodiment 1>
This embodiment is shown in FIGS.
[0027]
(Buried joint)
1 and 2 show a buried joint 1 for a buried joint of a road bridge. In this buried joint 1, 2 is a rubber layer, and three upper horizontal plates 3 a, 3 b, 3 c are fixed to the upper surface of the rubber layer 2 with gaps 4, 4 in the bridge axis direction. Three intermediate horizontal plates 5a, 5b and 5c are embedded in the middle of the rubber layer 2 with gaps 6 and 6 in the bridge axis direction. On the lower surface of the rubber layer 2, screw holes of an appropriate number of nuts 7 embedded in the rubber layer 2 are opened.
[0028]
The rubber layer 2 is made of, for example, soft rubber having a hardness of about 40 to 50 °. Moreover, the horizontal plates 3a to 3c and 5a to 5c are formed of a material having rigidity such as steel and plastic.
[0029]
As shown in FIG. 2, a plurality of holes 8 and 9 are formed in each of the horizontal plates 3a to 3c and 5a to 5c at appropriate intervals. These holes 8 and 9 and the plate gaps 4 and 6 are clogged with rubber. Therefore, the upper rubber layer 2a provided between the upper horizontal plates 3a to 3c and the intermediate horizontal plates 5a to 5c and the lower rubber layer 2b provided on the lower side of the intermediate horizontal plates 5a to 5c are: The intermediate horizontal plates 5a to 5c are connected via the gap 6 and the holes 8 and 9. Further, the upper rubber layer 2a and the lower rubber layer 2b are connected to both outer sides of the intermediate horizontal plates 5a and 5c on both sides. In addition, cuts 10 in the longitudinal direction of the seam (the direction in which the play is extended later) are formed on the lower surfaces of the upper rubber layer 2a and the lower rubber layer 2b at intervals in the bridge axis direction.
[0030]
As shown in FIG. 2, the central upper horizontal plate 3 b has a central portion in the seam longitudinal direction (direction extending between play described later) protruding in a mountain shape on both sides in the bridge axis direction. Therefore, the upper horizontal plates 3 a to 3 c The gaps 4 and 4 are bent in a substantially “<” shape and extend in the longitudinal direction of the joint. On the other hand, the gaps 6 and 6 between the intermediate horizontal plates 5a to 5c extend linearly in the joint longitudinal direction.
[0031]
However, the gaps 6 and 6 of the intermediate horizontal plates 5a to 5c are disposed on both outer sides of the gaps 4 and 4 of the upper horizontal plates 3a to 3c. That is, the upper horizontal plates 3a and 3c on both sides are disposed on the gaps 6 and 6 between the intermediate horizontal plates 5a to 5c. The gaps 4 and 4 between the upper horizontal plates 3a to 3c and the gaps 6 and 6 between the intermediate horizontal plates 5a to 5c may intersect with each other in plan view.
[0032]
Further, vertical plate-like spacers 11 are fixed to the lower surfaces of both ends of the upper horizontal plates 3a to 3c in the longitudinal direction of the joint. The spacer 11 forms a space for providing the upper rubber layer 2a between the upper horizontal plates 3a to 3c and the intermediate horizontal plates 5a to 5c when the buried joint 1 is manufactured.
[0033]
That is, when the buried joint 1 is manufactured, the upper horizontal plates 3a to 3c are set in the lower mold so that the spacers 11 are on the upper side, and raw rubber is placed on the upper horizontal plates 3a to 3c, and the intermediate horizontal plate is placed thereon. The plates 5a to 5c are placed, and further, the raw rubber is placed thereon, the upper die is covered, and the raw rubber is vulcanized and bonded to the upper horizontal plates 3a to 3c and the intermediate horizontal plates 5a to 5c by heating and pressing. . Thereby, the buried joint 1 in which the distance between the upper horizontal plates 3a to 3c and the intermediate horizontal plates 5a to 5c is constant can be obtained.
[0034]
The spacer 11 is formed in a gate shape having a window at the center as shown by a broken line in FIG. 1 so that the contact surface with respect to the intermediate horizontal plates 5a to 5c is reduced. This is because a gap is created between the spacer 11 and the intermediate horizontal plates 5a to 5c, and the spacer 11 hits the intermediate horizontal plates 5a to 5c by a wheel load after the buried joint 1 is installed at the road bridge joint. This is to prevent the hitting sound from becoming loud even if it exists. Moreover, although the upper rubber layer 2a is divided at the portion of the spacer 11, since the rubber on both sides of the spacer 11 is connected through the window, the bondability between the upper rubber layer 2a and the spacer 11 is improved. The thickness of the buried joint 1 is preferably 40 mm to 150 mm, and the width in the bridge axis direction is preferably 400 mm to 800 mm.
[0035]
(Embedded type joint of road bridge)
FIG. 3 shows an embedded joint using the embedded joint 1. In the figure, reference numeral 21 denotes a road bridge main body, and 22 denotes a play allowing the expansion and contraction of the road bridge main body 21. A notch is formed in the road bridge main body 21 on both sides of the play gap 22, and a non-land surface adjusting material 24 such as super fast hard cement or resin concrete is applied to the notch and becomes lower than the upper surface of the road bridge main body 1. A stepped portion 25 is formed.
[0036]
Thus, the buried joint 1 is constructed so as to straddle the step portions 25, 25 on both sides of the gap 22. The upper surface of the buried joint 1 is substantially flush with the upper surface of the road bridge body 21. The buried joint 1 is fixed to the road bridge main body 21 by an anchor 32 screwed to the nut 7. A gap between the buried joint 1 and the side surface of the notch is filled with a filler 36 such as a liquid rubber sealant.
[0037]
On the upper surface of the road bridge main body 21 and the buried joint 1, a first sheet 26 that serves as a pavement crack prevention and waterproof is provided, and a base layer asphalt pavement 27 is formed thereon. On the base layer asphalt pavement 27 is provided a second sheet 28 that also serves to prevent pavement cracking and waterproof, and a surface layer asphalt pavement 29 is provided thereon. A gap 22 under the buried joint 1 is filled with a backup material 30 made of sponge, polystyrene foam or the like, and a rubber seal material 31 is provided thereon.
[0038]
(Construction method for buried joint)
When constructing the buried joint on a new road bridge, the following procedure can be used.
A. The bottom surface of the notch formed by the boxing method or the like is flattened at the ends of the road bridge main bodies 21 and 21 (rough finish).
B. A back-up material 30 is packed in the gap 22 and a liquid rubber seal material is poured thereon to form a seal material 31.
C. A hole 33 for the anchor 32 is made in the notch.
D. The anchor hole 33 is filled with the anchor fixing material 34, and the uneven portion 24 is applied to the bottom surface of the notch, thereby forming the step portion 25. The same material as the unevenness adjusting material 24 can be used for the anchor fixing material 34.
E. The anchor 32 is screwed to the nut 7 of the embedded joint 1 in advance, and the anchor 32 is immersed in the anchor fixing member 34 of the anchor hole 33 to install the embedded joint 1 in the step portions 25 and 25. The buried joint 1 is installed by matching the required number in the longitudinal direction of the joint.
F. Filler 36 is filled in the gap between the buried joint 1 and the side surface of the notch.
G. Next, the first sheet 26 is pasted on the upper surface of the road bridge body 21 and the buried joint 1, the base layer asphalt pavement 27 is applied thereon, the second sheet 28 is pasted thereon, and the surface layer asphalt pavement 29 is formed thereon. Apply.
[0039]
When the existing road bridge expansion / contraction device is removed and replaced with the buried joint of the present invention (in the case of so-called repair), the road surface on both sides is cut along the existing expansion / contraction device with a concrete cutter, Crush the concrete and remove the telescopic device. Then, a step having a depth comparable to the thickness of the buried joint 1 is formed on both sides of the play, and thereafter, B to G are performed in the same manner as in the case of the new installation.
[0040]
(Function and effect)
Therefore, in the case of the above-described buried type joint, the buried joint 1 is formed by laminating the rubber layers 2a and 2b and the rigid lateral plates 3a to 3c and 5a to 5c. Thus, the pavements 27 and 29 can be prevented from being dented or clogged due to the wheel load of the passing vehicle.
[0041]
Further, the expansion / contraction deformation of the free space due to expansion / contraction of the road bridge body 21 and the relative vertical displacement between the road bridge bodies 21, 21 are absorbed by the elastic deformation of the buried joint 1, and the road bridge joint portion 27 is paved. , 29 can be prevented from acting on a large stress.
[0042]
That is, the expansion / contraction deformation of the gap 22 due to the expansion / contraction of the road bridge body 1 is absorbed by the expansion / contraction deformation of the rubber layers 2a, 2b. At that time, the elastic deformation of the rubber layers 2a, 2b is allowed in the plate gaps 4, 6 of the upper horizontal plates 3a-3c and the intermediate horizontal plates 5a-5c. Further, the rubber layers 2a and 2b are easily deformed by the cut 10 on the lower surface. As a means for improving the deformability, a plurality of vertical holes may be formed at appropriate intervals in the front, rear, left and right instead of the cut line 10.
[0043]
In addition, the deformation of the rubber layers 2a and 2b is allowed in the plate gaps 4 and 6 because the stress generated in the joint portion of the road bridge as the road bridge main body 21 expands and contracts is formed on both side portions of the buried joint 1 (the plate is provided). In other words, it is dispersed not only in the rubber-only part, but also in the part of the filler 36, but also in the parts of the plate gaps 4 and 6. Thus, the upper plate gap 4 and the lower plate gap 6 are respectively provided at two positions spaced in the bridge axis direction, and the upper and lower plate gaps 4 and 6 are displaced from each other in the bridge axis direction. As a result, the stress is eventually distributed to the four plate gap portions spaced in the bridge axis direction.
[0044]
As described above, the buried joint 1 is provided with the plate gaps 4 and 6 so that the stretchability is high and the stress dispersibility is high. This can be absorbed, and is advantageous in preventing the occurrence of cracks in the pavements 27 and 29.
[0045]
Further, the vertical displacement between the road bridge bodies 21 and 21 is such that the upper horizontal plates 3a to 3c and the intermediate horizontal plates 5a to 5c are inclined with the deformation of the rubber layers 2a and 2b, or the plate gap 4, Absorbed by relative displacement up and down at 6 sites. In other words, due to the presence of the plate gaps 4 and 6, each of the horizontal plates 3a to 3c and 5a to 5c can be inclined and relatively displaced up and down, so the degree of freedom of deformation of the rubber layers 2a and 2b is high. Therefore, the rubber layers 2a, 2b are easy to absorb the relative vertical displacement of the road bridge bodies 21, 21.
[0046]
Thus, it is the portion corresponding to the gap 4 of the upper horizontal plates 3a to 3c that the influence of the vertical displacement of the road bridge main bodies 21 and 21 finally appears on the pavements 27 and 29. Is provided at two locations spaced in the direction of the bridge axis, the influence is also distributed at two locations, and the pavements 27 and 29 are unlikely to crack.
[0047]
Even if the above-mentioned road bridge body 1 expands or contracts and moves up and down, micro cracks may occur in the pavements 27 and 29 at the portions corresponding to the gaps 4 and 4 of the upper and lower plates 3a to 3c. Since the tire extends obliquely with respect to the bridge axis corresponding to the shape, the automobile tire crosses the crack diagonally, which is advantageous in terms of ensuring good running performance.
[0048]
In addition, as shown by a chain line in FIG. 3, a load receiving member 35 slightly shorter than the thickness of the lower rubber layer 2b is provided on the lower surface of the intermediate horizontal plates 5a to 5c to project the wheel load of the passing vehicle to the intermediate horizontal plate 5a. ˜5c may be transmitted to the step portion 25 via the load receiving member 35.
[0049]
<Embodiment 2>
This embodiment is shown in FIGS. 4 to 6, and an expansion joint 41 that allows expansion and contraction of the road bridge main body 1 under the embedded joint 1 and supports the embedded joint 1 from below on the gap 2. There is a feature in that is provided.
[0050]
The buried joint 1 is basically the same as that of the first embodiment, but as shown in FIG. 5, the upper horizontal plate is composed of five pieces indicated by reference numerals 3a to 3e, and the intermediate horizontal plate is also indicated by reference numerals 5a to 5e. The gaps 4 and 6 are formed between the plates.
[0051]
The expansion joint 41 is formed by providing horizontal plates 43 and 43 on a pair of vertical plates 42 and 42 extending in parallel with the joint longitudinal direction. As shown in FIG. 6, the horizontal plate 43 is a double-sided tooth profile plate in which concave portions and convex portions that enter and exit in the bridge axis direction are alternately formed on both sides of the vertical plate 42 in the longitudinal direction of the joint. The lateral plates 42, 42 on both sides are opposed to each other by a convex portion and a concave portion, thereby forming a wavy gap 44 extending zigzag in the longitudinal direction of the joint. An anchor 45 projects from the back surface of the vertical plate 42, and an L-shaped anchor 45 is also provided on the lower surface of the outer side of the horizontal plate 43 (on the back side of the vertical plate 42).
[0052]
As shown in FIG. 4, the expansion joint 41 is fixed to the road bridge main body 21 by an anchor 45 with the upper surfaces of the horizontal plates 43, 43 being flush with the stepped portion 25, and inside the horizontal plates 43, 43. The uneven portion protrudes into the gap 22. A thin stainless steel cover plate 47 is placed on both lateral plates 43 of the expansion joint 41.
[0053]
The buried joint 1 is installed on the cover plate 47 and is fixed to the road bridge main bodies 21 and 21 by the anchor 32 as in the first embodiment. A gap between the buried joint 1 and the side surface of the notch is filled with a filler 36 such as a liquid rubber sealant. A first sheet 26 is provided on the upper surface of the road bridge body 21 and the buried joint 1, a base layer asphalt pavement 27 is formed thereon, a second sheet 28 is provided thereon, and a surface layer asphalt pavement is provided thereon. 29 is provided.
[0054]
The structure of the buried joint 1 is the same as that of the first embodiment, but the width in the bridge axis direction is about 1.5 to 3 times that of the buried joint 1 of the first embodiment. However, if the thickness of the buried joint 1 is increased, the stretch absorbability is increased accordingly, so that the width in the bridge axis direction can be reduced.
[0055]
That is, this Embodiment 2 is applied to a road bridge with a large amount of expansion and contraction, and for that purpose, the width of the buried joint 1 in the bridge axis direction is increased. In addition, since the gap 22 is wide in such a road bridge, the expansion joint 41 is provided to support the buried joint 1 so that the buried joint 1 does not fall into the gap 22.
[0056]
<Embodiment 3>
This embodiment is shown in FIG. That is, in the buried joint 1 of the present embodiment, two lower horizontal plates 51, 51 extending in a straight line in the seam longitudinal direction and arranged with a gap 52 in the bridge axis direction are buried under the rubber layer 2. Furthermore, rubber is covered on the lower surfaces of the lower horizontal plates 51 and 51. Further, nut holes are formed in the lower horizontal plate 51 at appropriate intervals in the front, rear, left and right, and nuts 7 are fitted into the nut holes and welded to the lower horizontal plate 51. The screw hole of the nut 7 is opened on the lower surface of the buried joint 1.
[0057]
Three upper horizontal plates 3 a, 3 b, 3 c are fixed to the upper surface of the rubber layer 2 with gaps 4, 4 in the bridge axis direction, and three intermediate horizontal plates 5 a are interposed between the rubber layers 2. , 5b and 5c are the same as in the first embodiment in that the gaps 6 and 6 are embedded in the bridge axis direction.
[0058]
In the case of the present embodiment, the same operational effects as in the first embodiment can be obtained, and not only the upper horizontal plates 3a, 3b, 3c and the intermediate horizontal plates 5a, 5b, 5c but also the lower horizontal plates 51, 51 are provided. Compressive deformation of the buried joint 1 due to the load from above becomes slight, the pavement flexure due to the wheel load is reduced, and the occurrence of cracks in the pavement is suppressed.
[0059]
In the present embodiment, the horizontal plate has three layers of upper, middle, and lower, but the rubber plate and the horizontal plate may be alternately stacked so that the horizontal plate has four or more layers.
[0060]
Moreover, although each above embodiment applies this invention to the joint part of road bridge main bodies, it cannot be overemphasized that this invention can be similarly applied to the joint part of a road bridge main body and an abutment.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a buried joint according to Embodiment 1 of the present invention.
FIG. 2 is a plan view of the buried joint.
FIG. 3 is a partially omitted cross-sectional view showing the embedded joint of the embodiment.
FIG. 4 is a partially omitted cross-sectional view showing an embedded joint according to Embodiment 2 of the present invention.
FIG. 5 is a plan view of the buried joint according to the embodiment.
FIG. 6 is a plan view showing the expansion joint and cover plate of the embodiment.
FIG. 7 is a cross-sectional view of a buried joint according to Embodiment 3 of the present invention.
FIG. 8 is a cross-sectional view showing an example of a conventional road bridge joint structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Embedded joint 2 Rubber layer 2a Upper rubber layer 2b Lower rubber layer 3a-3c Upper horizontal plate 4 Plate gap 5a-5c Intermediate horizontal plate 6 Plate gap 21 Road bridge main body 22 Free space 25 Step part 27, 29 Pavement 51 Lower horizontal plate 52 Plate gap

Claims (3)

It is a buried joint for a buried type joint of a road bridge that is laid so as to straddle the road bridge body on both sides of the gap of the road bridge joint or between the road bridge body and the abutment on both sides of the gap and buried under the pavement. ,
A rubber layer provided on the road bridge body on both sides of the play or on the road bridge body and the abutment on both sides of the play,
A plurality of upper rigid lateral plates fixed to the upper surface of the rubber layer and spaced apart in the bridge axis direction;
A plurality of intermediate rigid lateral plates embedded in the middle of the rubber layer and spaced apart in the bridge axis direction;
The rubber of the rubber layer is clogged in the gap between the plurality of upper rigid lateral plates,
A buried joint for a buried joint for a road bridge, wherein the upper rigid transverse plate is disposed between the plates of the intermediate rigid transverse plate. Steps that are lower than the upper surface of the main body of the road bridge are formed on the main body of the road bridge on both sides of the freeway of the road bridge joint, or on the main body of the road bridge and the abutment on both sides of the freeway,
The buried joint according to claim 1 is constructed so as to straddle the step portions on both sides of the play,
A buried joint for a road bridge, characterized in that continuous pavement is provided on the buried joint. Steps that are lower than the upper surface of the main body of the road bridge are formed on the main body of the road bridge on both sides of the freeway of the road bridge joint, or on the main body of the road bridge and the abutment on both sides of the freeway,
The buried joint according to claim 1 is constructed so as to straddle the step portions on both sides of the play,
Under the buried joint, an expansion joint that allows expansion and contraction of the road bridge body and supports the buried joint from below on the gap is provided,
A buried joint for a road bridge, characterized in that continuous pavement is provided on the buried joint.

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