JP3693632B2 - 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 the crack extends in the longitudinal direction of the seam (the direction intersecting the bridge axis), the traveling performance of the automobile is deteriorated. 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]
Furthermore, in the case of this buried joint, when a large load is applied from above as the automobile passes, there is a problem that the rubber plate is compressed and deformed and the pavement is bent downward. In other words, such a pavement bending deteriorates the running performance of the car, and if the phenomenon that the pavement bends and returns every time the car passes is repeated, the pavement itself originally has stretchability and Since there is almost no flexibility, the pavement tends to crack.
[0010]
The subject of this invention is suppressing the generation | occurrence | production of the crack of the said pavement in such an embedded type joint.
[0011]
Another object of the present invention is to improve the running performance of an automobile.
[0012]
[Means for Solving the Problems]
In order to solve such a problem, the present invention makes rubber embedded in the bridge axis direction while laminating rubber and a plurality of plates to form an embedded joint, while making the plate discontinuous in the bridge axis direction. Therefore, it is possible to improve the stretchability in the bridge axis direction without impairing the load supportability, and further, by providing a support for supporting the upper plate on the lower plate between the upper and lower plates, The compression deformation was prevented.
[0013]
That is, the invention according to claim 1 is constructed so as to straddle the road bridge main body on both sides of the gap of the road bridge joint, or to straddle the road bridge main body and the abutment on both sides of the gap, and is buried under the pavement. A buried joint for a buried joint of a road bridge,
A rubber layer,
A plurality of upper lateral plates provided on the upper portion of the rubber layer and spaced apart in the bridge axis direction;
A plurality of lower lateral plates provided at the lower portion of the rubber layer and spaced apart in the bridge axis direction;
A space is provided in the bridge axis direction between the upper lateral plate and the lower lateral plate, and the upper lateral plate is placed on the lower side so as to prevent the spacing between the lateral plates from becoming narrower. And a plurality of supports that prevent compression deformation of the rubber layer between the lateral plates .
[0014]
Therefore, since the buried joint is formed by laminating rubber and a plate, it does not flow plastically, and it is possible to prevent the pavement surface from being dented or clogged due to the wheel load of the automobile.
[0015]
Thus, there are two important features in the present invention, one of which is that the support provided between the upper lateral plate and the lower lateral plate causes the upper lateral plate to It is the point which was supported by the plate and suppressed that the space | interval of these both horizontal plates became narrow.
[0016]
Therefore, even if a large wheel load acts on the buried joint as the automobile passes, the rubber layer between the upper and lower lateral plates is prevented from being deformed by compression, and thus the pavement is prevented from bending downward. The Therefore, the running performance of the automobile is improved, and cracks can be avoided in the pavement.
[0017]
Another important feature of the present invention is that a plurality of lateral plates provided at intervals in the bridge axis direction and rubber are laminated, so that the intervals in the bridge axis direction are increased as the rubber layer is deformed. The adjacent horizontal plates are relatively displaced.
[0018]
That is, if there is only one horizontal plate, the rubber layer provided thereunder only undergoes shear deformation, but in the present invention, a plurality of horizontal plates are spaced in the direction of the bridge axis. Therefore, the elastic deformation of the rubber layer is allowed between the plates. In addition, the deformation of the rubber layer between the plates of the plurality of horizontal plates is allowed because the stress generated in the road bridge joint portion due to the expansion and contraction of the road bridge body is not only between the both side portions of the buried joint but also between the plates. It is also distributed to the site. That is, the dispersibility of stress is high.
[0019]
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.
[0020]
Although the number of horizontal plates provided at intervals in the bridge axis direction may be two, it is preferable to arrange three or more in parallel.
[0021]
The invention according to claim 2 is a road bridge that is constructed so as to straddle the road bridge main body on both sides of the gap of the road bridge joint part, or to straddle the road bridge main body and the abutment on both sides of the gap, and buried under the pavement. Embedded joints for embedded joints of
A rubber layer,
A plurality of upper horizontal plates fixed to the upper surface of the rubber layer and provided at intervals in the bridge axis direction;
A plurality of intermediate lateral plates embedded in the middle of the rubber layer and spaced in the bridge axis direction;
Bridge axial direction so that it is fixed to the lower surface of the rubber layer and supported by the road bridge body on both sides of the gap between the bridges of the road bridge, or supported by the road bridge body and the abutment on both sides of the gap. Two lower horizontal plates provided at intervals,
A space is provided between the upper horizontal plate and the intermediate horizontal plate in the bridge axis direction, and the upper horizontal plate is supported by the intermediate horizontal plate so as to suppress a decrease in the interval between the two horizontal plates . a plurality of upper support you block the compressive deformation of the rubber layer between the two lateral plates,
A space is provided in the bridge axis direction between the intermediate horizontal plate and the lower horizontal plate, and the intermediate horizontal plate is supported by the lower horizontal plate so as to suppress a decrease in the interval between the two horizontal plates . characterized in that it comprises a this both side plates between the plurality of lower support you block the compressive deformation of the rubber layer.
[0022]
Therefore, the present invention has the same operation as that of the first aspect, and the upper lateral plate is supported by the intermediate lateral plate by the upper support, and the intermediate lateral plate is supported by the lower lateral plate by the lower support. In order to prevent the rubber layer between the horizontal plates from being compressed and deformed, to prevent the pavement from being bent downward more reliably, to improve the running performance of the automobile, and to avoid cracks in the pavement. Will be advantageous.
[0023]
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 or 2 is constructed so as to straddle the stepped 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.
[0024]
Therefore, according to the present invention, as is clear from the description of the inventions according to claims 1 and 2, it is possible to suppress the occurrence of cracks and unevenness on the pavement and to improve the running performance of the automobile. Become.
[0025]
【The invention's effect】
As described above, according to the present invention, a plurality of horizontal plates are provided on the upper and lower sides of the rubber layer at intervals in the bridge axis direction, and the rubber layer between the horizontal plates is disposed between the upper and lower horizontal plates. since provided with a support to prevent the compression deformation, or the upper surface of the rubber layer, a plurality of transverse plates in each of the intermediate and the lower surface spaced in Hashijiku direction, both side between the lateral plates of the lower middle on this Since the support that prevents the compression deformation of the rubber layer between the plates is provided, the compression deformation of the rubber layer is prevented, the bending of the pavement due to the wheel load of the automobile is prevented, and the stretchability of the buried joint is increased, so that the pavement It is advantageous in suppressing cracks from being generated, the running performance of the automobile is improved, and the construction time can be greatly shortened.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0027]
Embodiment 1
(Buried joint)
1 and 2 show a buried joint 1 for a buried joint of a road bridge. In this buried joint 1, reference numeral 2 denotes a rubber layer, and three upper horizontal plates 3, 3, 3 are fixed to the upper surface of the rubber layer 2 with a gap 4 in the bridge axis direction. Three intermediate horizontal plates 5, 5, 5 are embedded in the middle of the rubber layer 2 with gaps 6, 6 in the bridge axis direction. Two lower horizontal plates 7 are fixed to the lower surface of the rubber layer 2 with a gap 8 in the center of the buried joint 1.
[0028]
Between the upper horizontal plate 3 and the intermediate horizontal plate 5, a plurality of upper supports 11 for supporting the upper horizontal plate 3 on the intermediate horizontal plate 5 are provided at intervals in the front-rear and left-right directions (bridge axis direction and joint longitudinal direction). It has been. Further, a plurality of lower support bodies 12 that support the intermediate horizontal plate 5 on the lower horizontal plate 7 are also provided between the intermediate horizontal plate 5 and the lower horizontal plate 7 at intervals in the front-rear and left-right directions. Further, an appropriate number of nuts 13 are fixed to the upper surface of the lower horizontal plate 7, and screw holes corresponding to the nuts 13 are opened on the lower surface of the lower horizontal plate 7.
[0029]
The rubber layer 2 is formed of rubber having a hardness of about 40 to 75 °, for example. Moreover, the horizontal plates 3, 5, and 7 are formed of a material having rigidity such as steel and plastic. This also applies to other embodiments described later.
[0030]
As shown in FIG. 2, the central upper horizontal plate 3 has a central portion in the longitudinal direction of the seam (the direction in which the play will be described later) protrudes in a mountain shape on both sides in the bridge axis direction. The gaps 3 and 3 extend in a substantially "<" shape in the seam longitudinal direction. On the other hand, the gap 6 between the adjacent intermediate horizontal plates 5 and 5 extends linearly in the seam longitudinal direction.
[0031]
However, the gaps 6 and 6 of the intermediate horizontal plate 5 are arranged on both outer sides of the gaps 4 and 4 of the upper horizontal plate 3. That is, the upper horizontal plates 3 on both sides are disposed on the gaps 6 and 6 of the intermediate horizontal plate 5. Note that the gaps 4 and 4 of the upper horizontal plate 3 and the gaps 6 and 6 of the intermediate horizontal plate 5 may intersect with each other in plan view.
[0032]
Both the upper support 11 and the lower support 12 are formed of steel balls. Instead of a spherical, as cubic, rectangular solid shape, it is possible to adopt a cylindrical, or may be employed a round pipe or a solid rod extending seam longitudinally.
[0033]
The upper rubber layer 2 a between the upper horizontal plate 3 and the intermediate horizontal plate 5 and the lower rubber layer 2 a between the intermediate horizontal plate 5 and the lower horizontal plate 7 are connected in the gap 6 of the intermediate horizontal plate 5. ing.
[0034]
In addition, although the side surfaces of the intermediate horizontal plates 5 and 5 are exposed on both side surfaces of the buried joint 1, they may not be exposed. That is, the upper rubber layer 2a and the lower rubber layer 2a may be connected on both outer sides of the intermediate horizontal plates 5 and 5 on both sides. 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. This also applies to other embodiments described later.
[0035]
(Manufacture of buried joints)
The buried joint 1 can be manufactured as follows. That is, the lower horizontal plates 7 and 7 are set in a lower mold, a raw rubber is placed on the lower horizontal plates 7 and 7, and a number of lower supports 12 are embedded in the raw rubber at appropriate intervals. Intermediate horizontal plates 5, 5, and 5 are placed thereon, raw rubber is placed thereon, and a large number of upper supports 11 are embedded in the raw rubber at appropriate intervals. Further, the upper horizontal plates 3, 3, and 3 are placed thereon, and the upper die is placed on the upper horizontal plates 3, and the raw rubber is vulcanized and bonded to the upper horizontal plate 3, the intermediate horizontal plate 5, and the lower horizontal plate 7 by heating and pressing. You can do it. As described above, the buried joint 1 in which the supports 11 and 12 are not fixed to the lateral plates 3, 5 and 7 (the supports 11 and 12 can move laterally) is obtained.
[0036]
Further, the support bodies 11 and 12 may be fixed to any one of the opposing horizontal plates by welding or the like. For example, the lower support 12 is welded to the lower horizontal plate 7 and covered with raw rubber, and the upper support 11 is welded to the intermediate horizontal plate 5 and covered with raw rubber. . This is advantageous for positioning the supports 11 and 12. Moreover, since the support bodies 11 and 12 are being fixed to any one horizontal plate, the other horizontal plate and the said support bodies 11 and 12 are relatively laterally movable.
[0037]
Further, as shown in FIG. 3, a small hole 14 is formed in the horizontal plate 3 (or 5, 7), and the support 11 (or 12) is supported on the peripheral edge of the small hole 14, thereby positioning it. You may do it.
[0038]
(Embedded type joint of road bridge)
FIG. 4 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 an uneven 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 21. A stepped portion 25 is formed.
[0039]
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 13. In addition, 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 seal material, cement mortar, or resin mortar.
[0040]
On the upper surface of the road bridge main body 21 and the buried joint 1, a first sheet 26 that also serves as a pavement crack suppression and waterproofing 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 suppress 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.
[0041]
(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 13 of the embedded joint 1 in advance, and the anchor 32 is immersed in the anchor fixing member 34 of the anchor hole 33 so that the embedded joint 1 is installed 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.
[0042]
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.
[0043]
(Function and effect)
Therefore, in the above-described buried type joint, since the buried joint 1 is formed by laminating the rubber layers 2a and 2b and the rigid lateral plates 3, 5, and 7, the load resistance is high, and the passage is passed. The pavements 27 and 29 are prevented from being dented or overburdened by the wheel load of the automobile.
[0044]
In particular, the upper horizontal plate 3 is supported by the intermediate horizontal plate 5 by the upper support 11, and the intermediate horizontal plate 5 is supported by the lower horizontal plate 7 by the lower support 12, so that the upper rubber layer 2a and the lower The rubber layer 2b is prevented from being compressed and deformed, and the pavements 27 and 29 are not bent downward. Therefore, the running performance of the automobile is improved, and cracks in the pavements 27 and 29 are suppressed.
[0045]
Further, the expansion / contraction deformation due to the expansion / contraction of the road bridge main body 21 is absorbed by the expansion / contraction of the buried joint 1, and a large stress is prevented from acting on the pavements 27, 29 of the road bridge joint.
[0046]
That is, the expansion / contraction deformation of the gap 22 due to the expansion / contraction of the road bridge body 21 is absorbed by the expansion / contraction deformation of the rubber layers 2a, 2b. At this time, the support 11 does not prevent the upper horizontal plate 3 and the intermediate horizontal plate 5 from relatively moving in the bridge axis direction, and the support 12 has the intermediate horizontal plate 5 and the lower horizontal plate 7 in the bridge axis direction. Since the relative movement is not hindered, the elastic deformation of the rubber layers 2a and 2b is allowed in the plate gaps 4 and 6 of the upper horizontal plate 3 and the intermediate horizontal plate 5, respectively.
[0047]
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 due to the expansion and contraction of the road bridge body 21 is provided on both side portions of the buried joint 1 (filler 36). This means that it is dispersed not only in the plate gaps 4 and 6 but also in 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.
[0048]
As described above, the buried joint 1 is provided with the plate gaps 4 and 6 so that the stretchability is high and the dispersibility of the stress is high. This can be absorbed, and is advantageous in suppressing the occurrence of cracks in the pavements 27 and 29.
[0049]
Even if the above-described expansion and contraction of the road bridge main body 21 may cause micro cracks in the pavements 27 and 29 at portions corresponding to the gaps 4 and 4 of the upper horizontal plate 3, the cracks correspond to the gap shape. Since the vehicle tire extends obliquely with respect to the bridge axis, the automobile tire crosses the crack diagonally, which is advantageous in terms of ensuring good running performance.
[0050]
A rubber layer may be provided on the lower surface of the lower horizontal plate 7. This also applies to the second embodiment.
[0051]
Embodiment 2
This embodiment is shown in FIGS. 5 to 7 and is characterized in that a pipe is used as a support.
[0052]
That is, in the buried joint 1 shown in the figure, 2 is a rubber layer, and the upper horizontal plates 3, 3 and 3 extending linearly in the longitudinal direction of the seam on the upper surface of the rubber layer 2 are spaced in the bridge axis direction. 4 is fixed. In the middle of the rubber layer 2, three intermediate horizontal plates 5, 5, 5 extending linearly in the longitudinal direction of the seam are embedded with gaps 6, 6 in the bridge axis direction. On the lower surface of the rubber layer 2, two lower horizontal plates 7, 7 extending linearly in the longitudinal direction of the joint are fixed to the center of the buried joint 1 with a gap 8.
[0053]
Between the upper horizontal plate 3 and the intermediate horizontal plate 5, a plurality of upper supports 11 that support the upper horizontal plate 3 on the intermediate horizontal plate 5 are provided at intervals in the bridge axis direction. Further, a plurality of lower support bodies 12 that support the intermediate horizontal plate 5 on the lower horizontal plate 7 are also provided between the intermediate horizontal plate 5 and the lower horizontal plate 7 at intervals in the bridge axis direction. Nut holes are formed in the lower horizontal plate 7 at appropriate intervals in the front, rear, left, and right, and nuts 13 are fitted into the nut holes and welded to the lower horizontal plate 7. The screw hole of the nut 13 is opened on the lower surface of the buried joint 1.
[0054]
Each of the upper support 11 and the lower support 12 is formed by a pipe extending in the seam longitudinal direction as shown in FIG. That is, as the upper supports 11 and 12, three types of pipes 11a to 11c and 12a to 12c having different lengths are used. In FIGS. 5 and 7, “11” and “12” are generically used as the reference numerals of the support, but in FIG. 6, a unique reference numeral with a Roman suffix attached to each pipe having a different length. Used.
[0055]
As the upper support, a total of seven long pipes 11a and medium pipes 11b are arranged on one side of the joint joint 1 in the longitudinal direction of the seam so that they are alternately arranged in the bridge axis direction. A similar long pipe 11a and middle pipe 11b are arranged so as to be symmetrical with one side. The short pipe 11c is arranged between the opposed middle pipes 11b and 11b so as to be arranged coaxially therewith.
[0056]
As a lower support, a total of four long pipes 12a and middle pipes 12b are arranged on one side of one lower lateral plate 7 in the longitudinal direction of the seam so as to be alternately arranged in the bridge axis direction, and is opposite to the longitudinal direction of the seam. In addition, similar long pipes 12a and intermediate pipes 12b are alternately arranged in the bridge axis direction so as to be symmetrical with the one side. The short pipe 12c is arranged between the opposed middle pipes 12b and 12b so as to be arranged coaxially therewith. On the other lower horizontal plate 7, the long, middle and short pipes 12 a to 12 c are arranged in the same manner as the one lower horizontal plate 7.
[0057]
Further, as shown in FIG. 5, the central intermediate horizontal plate 5 is supported by a total of four lower supports 12 arranged two on each side of the gap 22. The outer intermediate horizontal plates 5 on both the outer sides are respectively supported by two lower supports 12. The central upper horizontal plate 3 is supported by one upper support 11 arranged in the center. The upper lateral plates 3 on both outer sides are supported by a total of three upper support members 11 on the outer intermediate horizontal plate 5 and upper support members 11 on the ends of the central intermediate horizontal plate 5.
[0058]
The buried joint 1 of the present embodiment can also be installed at the road bridge joint as in the first embodiment to form a buried joint.
[0059]
In this embodiment, the same effect as that of the first embodiment can be obtained.
[0060]
In addition, when a vehicle travels on a road bridge, relative vertical displacement occurs between the ends of the road bridge main body facing each other with a gap 22 between them, and conventionally this relative vertical displacement causes a crack in the pavement. It was a factor. On the other hand, in the present embodiment, the occurrence of cracks due to the vertical displacement is also suppressed.
[0061]
That is, as shown in FIG. 7, when a vertical relative displacement occurs between the ends of the road bridge main bodies 21, 21, a difference in height occurs between the lower supports 12, 12 on both sides of the gap 22, thereby The plate 5 is slightly deformed and inclined. Due to this inclination, the three upper supports 11 placed on the central intermediate horizontal plate 5 are changed in height in stages. Along with this, a difference in height is generated between the opposing ends of the upper lateral plates 3 and 3 on both outer sides, and the central upper lateral plate 3 is inclined.
[0062]
Therefore, even if a vertical displacement occurs between the ends of the road bridge main bodies 21 and 21, the pavement 35 does not cause a sudden change in height because the upper portion of the upper horizontal plate 3 in the center is gently inclined. . For this reason, it is avoided that the pavement 35 cracks.
[0063]
As described above, the upper horizontal plate 3 is divided into three pieces so that the central upper horizontal plate 3 straddles the play gap 22, and the central upper horizontal plate 3 is inclined in accordance with the vertical displacement of the end portion of the road bridge main body. Therefore, the generation of cracks in the pavement 35 is suppressed. The number of upper horizontal plates 3 may be four or more.
[0064]
Embodiment 3
This embodiment is shown in FIG. 8 to FIG. 10, and a pipe is used as a support as in the second embodiment. However, as the horizontal plate, two types of upper horizontal plate 3 and lower horizontal plate 7 are used.
[0065]
That is, in the buried joint 1 shown in the figure, 2 is a rubber layer, and the upper horizontal plates 3, 3 and 3 extending linearly in the longitudinal direction of the seam on the upper surface of the rubber layer 2 are spaced in the bridge axis direction. 4 is fixed. Under the rubber layer 2, three lower lateral plates 7, 7, 7 extending linearly in the longitudinal direction of the joint are embedded with a gap 8 in the bridge axis direction. Rubber is also covered on the lower surface of the lower horizontal plate 7.
[0066]
Between the upper horizontal plate 3 and the lower horizontal plate 7, a plurality of supports 11 for supporting the upper horizontal plate 3 on the lower horizontal plate 5 are provided at intervals in the bridge axis direction. Nut holes are formed in the lower horizontal plate 7 at appropriate intervals in the front, rear, left, and right, and nuts 13 are fitted into the nut holes and welded to the lower horizontal plate 7. The screw hole of the nut 13 is opened on the lower surface of the buried joint 1.
[0067]
As the support body 11, as shown in FIG. 9, three types of pipes 11a to 11c extending in the longitudinal direction of the seam and having different lengths are used. 8 and 10, “11” is generically used as a symbol for the support, but in FIG. 9, a unique symbol with a Roman suffix attached to each pipe having a different length is used.
[0068]
The arrangement of the pipes 11a to 11c will be described. A total of seven long pipes 11a and middle pipes 11b are arranged on one side of the buried joint 1 in the longitudinal direction of the seam so as to be alternately arranged in the bridge axis direction. The same long pipe 11a and middle pipe 11b are also arranged on the side so as to be symmetrical with the one side. The short pipe 11c is arranged between the opposed middle pipes 11b and 11b so as to be arranged coaxially therewith.
[0069]
Further, as shown in FIG. 8, one support body 11 is arranged on the central lower horizontal plate 7 arranged so as to straddle the gap 22, and three supports are arranged on both outer lower horizontal plates 7. The support 11 is arranged. The central upper horizontal plate 3 is supported by a total of three, a central support 11 and supports 11, 11 on both sides thereof. The upper lateral plates 3 on both outer sides are supported by two outer supports 11.
[0070]
The buried joint 1 of the present embodiment can also be installed at the road bridge joint as in the first embodiment to form a buried joint.
[0071]
In this embodiment, the same effect as that of the first embodiment can be obtained. Further, as shown in FIG. 10, when relative vertical displacement occurs between the ends of the road bridge main bodies 21 and 21, as in the second embodiment, the central upper horizontal plate 3 straddling the gap 22 is inclined, Since there is no sudden change in height in the pavement 35, the occurrence of cracks in the pavement 35 is suppressed.
[0072]
-Others-
The upper surface of the upper horizontal plate 3 may be covered with rubber.
[0073]
In the second and third embodiments, the gap 4 between the upper horizontal plates 3 may extend obliquely as in the first embodiment.
[0074]
The embedded joint may be formed by alternately laminating rubber layers and horizontal plates so that the horizontal plates have four or more layers.
[0075]
Moreover, although the said embodiment applies this invention to the joint part of road bridge main bodies, of course, this invention is applicable similarly 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 showing the buried joint with a part cut away.
FIG. 3 is a cross-sectional view showing a means for positioning the support body on the horizontal plate according to the embodiment;
FIG. 4 is a partially omitted cross-sectional view showing an embedded joint according to the embodiment.
FIG. 5 is a cross-sectional view of a buried joint according to Embodiment 2 of the present invention.
FIG. 6 is a plan view showing the buried joint with a part cut away.
FIG. 7 is a schematic cross-sectional view showing the behavior of the buried joint when a relative vertical displacement is generated between the opposite ends of the road bridge body.
FIG. 8 is a cross-sectional view of a buried joint according to Embodiment 3 of the present invention.
FIG. 9 is a plan view showing the embedded joint with a part cut away.
FIG. 10 is a schematic cross-sectional view showing the behavior of the buried joint when a relative vertical displacement is generated between opposite ends of the main body of the road bridge.
FIG. 11 is a sectional view showing an example of a conventional road bridge joint structure.
[Explanation of symbols]
1 buried joint
2 Rubber layer
2a Upper rubber layer
2b Lower rubber layer
3 Upper horizontal plate
4 Plate gap
5 Intermediate horizontal plate
6 Plate gap
7 Lower horizontal plate
8 Plate gap
11 Upper support
12 Lower support
21 main road bridge
22 Yuma
25 Steps 27, 29, 35 Pavement

Claims (3)

Embedding joints for buried joints of road bridges that are constructed so as to straddle the road bridge bodies on both sides of the gap between the bridges of the road bridge, or on the road bridge bodies and abutments on both sides of the gap, and buried under the pavement. Because
A rubber layer,
A plurality of upper lateral plates provided on the upper portion of the rubber layer and spaced apart in the bridge axis direction;
A plurality of lower lateral plates provided at the lower portion of the rubber layer and spaced apart in the bridge axis direction;
A space is provided in the bridge axis direction between the upper lateral plate and the lower lateral plate, and the upper lateral plate is placed on the lower side so as to prevent the spacing between the lateral plates from becoming narrower. A buried joint for a buried joint of a road bridge, characterized by comprising a plurality of supports that support the lateral plates and prevent compression deformation of a rubber layer between the lateral plates . Embedding joints for buried joints of road bridges that are constructed so as to straddle the road bridge bodies on both sides of the gap between the bridges of the road bridge, or on the road bridge bodies and abutments on both sides of the gap, and buried under the pavement. Because
A rubber layer,
A plurality of upper horizontal plates fixed to the upper surface of the rubber layer and provided at intervals in the bridge axis direction;
A plurality of intermediate lateral plates embedded in the middle of the rubber layer and spaced in the bridge axis direction;
Bridge axial direction so that it is fixed to the lower surface of the rubber layer and supported by the road bridge body on both sides of the gap between the bridges of the road bridge, or supported by the road bridge body and the abutment on both sides of the gap. Two lower horizontal plates provided at intervals,
A space is provided between the upper horizontal plate and the intermediate horizontal plate in the bridge axis direction, and the upper horizontal plate is supported by the intermediate horizontal plate so as to suppress a decrease in the interval between the two horizontal plates . a plurality of upper support you block the compressive deformation of the rubber layer between the two lateral plates,
A space is provided in the bridge axis direction between the intermediate horizontal plate and the lower horizontal plate, and the intermediate horizontal plate is supported by the lower horizontal plate so as to suppress a decrease in the interval between the two horizontal plates . the both lateral plates between multiple embedded joint for buried type joint road bridge, characterized in that it comprises a lower support you block the compressive deformation of the rubber layer. 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 or 2 is constructed so as to straddle the stepped 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.

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