JP4222447B2 - Expansion joint structure and expansion joint construction method - Google Patents

Description

The present invention relates to a so-called butt joint that constitutes a road bridge expansion / contraction device for road bridge structures in rivers, valleys, elevated roads, various roads, and the like, and relates to the structure of the expansion joint and the expansion joint construction method.

Conventionally, an example of this type of road bridge expansion and contraction device, that is, a so-called butt joint, has a configuration shown in FIG. FIG. 4 shows a vertical section in a direction perpendicular to the road width direction.
To explain this, reference numeral 1 denotes a joint seal rubber, for example, encapsulating a natural rubber foam 2. The joint seal rubber 1 is formed of weather-resistant neoprene rubber, and has a substantially V-shaped groove 1a in the cross section in the road width direction at the approximate center of the surface as shown in FIG. The joint seal rubber 1 is, for example, made of back-filled concrete or epoxy resin mortar placed between the other floor slabs 3 and 4 or the parapet, and interposed between the other back-filling members 5 and 6. Yes. On the other hand, the space between the other floor slabs 3 and 4 or the parapet is between floor slabs, and the left and right sides of the joint seal rubber 1 disposed in the joint space D located above the corner slab 7 , 8 are extended in the road width direction and embedded in the one or the other back-filling members 5, 6 or the epoxy resin mortar. The corner channels 7 and 8 are formed in a substantially bowl shape, and the joint seal rubber 1 is adhered by applying an adhesive. Reference numerals 9 and 10 denote deformed steel bar studs on the other side, which are fixed to the outer surface of the corner channels 7 and 8 and are arranged to extend in a predetermined interval in the road width direction. 8 is supported. On the other hand, the free ends of the other deformed steel bar studs 9 and 10 are supported by being bound to concrete anchors 11 and 12 embedded in the one or other floor slabs 3 and 4 or in the parapet. Reference numerals 13 and 14 denote reinforcing reinforcing bars, which are in contact with the one and the other deformed steel bar studs 9 and 10 and the concrete anchors 11 and 12, respectively, and the one and the other floor slabs 3 and 4 and the one and the other backfilling member 5, 6 has a function of enhancing the connectivity with 6 and reinforcing the backfill members 5 and 6 themselves.
In the figure, reference numerals 15 and 16 denote one reinforcing member laid on the other floor slabs 3 and 4. Further, the contact surface between the one and the other floor slabs 3 and 4 and the one and the other backfilling members 5 and 6 and the one and the other backfilling members 5 and 6 and the one and the other pavement members 15, An adhesive such as an epoxy resin as a primer is applied to the contact surface 16.

Thus, for example, when the thickness of the one and the other pavement members 15 and 16 is 75 (mm), the other backfilling members 5 and 6 are set on the basis of about 100 (mm). To do. Various types of joint seal rubber 1 are prepared and selected according to the amount of expansion and contraction. And the dimension at the time of construction is determined in conformity with the field conditions so as not to project, for example, an epoxy resin mortar that becomes the material of the back-filling member from the one or other floor slabs 3 or 4 or the parapet.
Then, the joint clearance D is determined in consideration of the total amount of expansion and contraction due to the outside air temperature of the bridge and the outside air temperature at the time of installation, and the cutting position of the other pavement members 15 and 16 is defined by marks on the pavement. Next, according to the set mark, the other pavement members 15 and 16 are cut and removed. The one and other floor slabs 3 and 4 or the parapet surface are finished into a flat concrete surface by, for example, mechanical cutting. Next, a wedge-type concrete anchor is driven into the concrete surface flattened at a position along the other one of the deformed steel bar studs 9 and 10.
On the other hand, the corner channels 7 and 8 to which the other deformed steel bar studs 9 and 10 are fixed are attached to the joint clearance D by attaching the left and right sides of the joint seal rubber 1 enclosing the natural rubber foam 2. Reinforcing bars 13 and 14 are arranged in the longitudinal direction of the expansion joint (in the direction perpendicular to the bridge axis), and the concrete anchors 11 and 12 and one of the other deformed steel bar studs 9 and 10 are bound with an annealed iron wire. Then, the epoxy resin stock solution, which is the material of the one or the other backfilling members 5 and 6, is used as a primer, and the upper surface of the one or the other floor slab 3 or 4 or the parapet or the one or the other pavement members 15 or 16 is cut. Apply sufficiently to the outer surfaces of the surface and corner channels 7,8. Then, the epoxy resin mortar or the epoxy resin concrete mixed and stirred at a predetermined mixing ratio is placed by mechanical mixing to a height that is flush with the one of the other pavement members 15 and 16, and is shaped and cured. To complete the construction.
In addition, regarding the technical idea substantially the same as the above-described conventional technology, it is disclosed in “Standard Collection of Bridge Expansion Joints Collection Vol. 6” issued by the Japan Road Joint Association in January 2000.
Collection of standard drawings for expansion joints for bridges Vol. 6 (Japan Road Joint Association)

Since the conventional technique has the above-described configuration and construction method, the following problems existed.
That is, according to the conventional technique, the other floor slab 3, 4 or parapet is damaged by the installation of the concrete anchors 11, 12, and the joint seal rubber 1 is compressed and held by the bowl-shaped corner channels 7, 8. The holding power is relatively weak, and the adhesive is applied to the joint with a rectangular cross section. After compression, the load is applied due to the accumulation of earth and sand, or the joint seal rubber 1 is dropped or popped out due to insufficient restoring force. In some cases, the joint seal rubber 1 may be detached from the other back-filling members 5 and 6, and the other deformed steel bar studs 9 and 10 interposed in the back-filling members 5 and 6 are bound to this. The concrete anchors 11 and 12 to be made have a point contact and have a problem that their durability is low. In addition, since the other one of the other backfilling members 5 and 6 is made of super-hard cemented concrete or the like, corner breakage or partial depression may occur due to an impact, causing troubles in the running of the vehicle and the other one or the other. There was also a bottleneck in which a level difference due to rubbing or excavation after the opening of traffic with the pavement members 15 and 16 was induced, and there was no anti-slip action, and re-repair of the road was required. On the other hand, the epoxy resin mortar constituting the other backfilling members 5 and 6 has a slow rise in strength during construction in winter, and the repair work requires forced heating curing due to traffic restrictions. Further, in the conventional technique, as the concrete anchors 11 and 12 are fixed, the above-mentioned one and other floor slabs 3 and 4 are notched or a bar anchor is required, and the number of parts increases and the structure becomes complicated. There was a negative effect.

The structure of the expansion joint according to the present invention and the expansion joint construction method include a thin stainless steel frame disposed in the joint play, constituting a joint in a pavement in which high-fluidity flexible resin concrete is placed as a backing member, and the thin stainless steel frame Since a non-slip measure is applied to the surface of the flat portion and the seal rubber member is compression-inserted between the one end leg portions of the two thin stainless steel frames, the seal rubber member does not fall off or pop out. Anchor fixing to the backfill member is achieved by a rib plate attached to the other end leg portion of the thin stainless steel frame and the back surface side of the flat surface portion, and the rib plate strengthens the fixing to the backfill member. The high-flowability flexible resin concrete of the backfilling member has fluidity that spreads to a narrow place, possesses the property of being worn down to the same extent as a paving member, and the sealing rubber member has a substantially tulip cross section. In addition, a horizontal support portion is bridged in the hollow portion so as to maintain the restoring force of the original shape, which is constituted by the following configuration and means.

That is, according to the first aspect of the present invention, one pavement member laid on one floor slab, the other pavement member laid on the other floor slab, and the one or other pavement member One and the other backfilling member formed adjacent to each other, one end leg portion that is inserted facing the joint play between the one and other backfilling members and hangs down on the joint play gap side, and the backfilling member A substantially U-shaped thin stainless steel frame that forms a set of two flat portions arranged substantially flush with each other and a second end leg portion that hangs down on the opposite side of the joint play, and the joint play, It is characterized by comprising a seal rubber member which is compression-inserted between one leg portions of a thin stainless steel frame and has a plurality of hollow portions formed vertically in the axial length direction.

According to a second aspect of the present invention, in the first aspect of the invention, the one end leg portion of the substantially U-shaped thin stainless steel frame constituting the set is formed in a substantially arc-shaped cross section, and the one end leg portion. The outer surface shape of the seal rubber member to be compression-inserted is a substantially arc shape adapted to the shape of the one end leg portion.

According to the invention described in claim 3, in the invention described in claim 1 , a plurality of air vent holes are perforated on the flat portion of the substantially U-shaped stainless steel frame constituting the set in a staggered manner. It is characterized by.

According to the invention of claim 4, in the invention of claim 1 , the surface of the flat portion of the substantially U-shaped thin stainless steel frame constituting the set is formed with a series of comb-shaped step surfaces. It is characterized by.

According to a fifth aspect of the present invention, in the first aspect of the invention, a substantially triangular cross section at a predetermined interval in the road width direction on the back side of the flat portion of the substantially U-shaped stainless steel frame constituting the set. A plurality of first rib plates having a shape are provided.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the other end leg of the substantially U-shaped thin stainless steel frame constituting the set is predetermined in the road width direction. A plurality of second rib plates are provided which are punched at intervals and formed to bend and project at a position of approximately 45 ° from the outer surface of the other end leg.

According to the seventh aspect of the present invention, the joint gap is formed on the one and the other floor slabs, and the one and the other pavement members are laid and constructed, and the one end leg portion, the plane portion and the other formed in a substantially arc shape in cross section. The one leg portion of the thin U-shaped stainless steel frame constituting the pair of end leg portions is suspended and loaded on the joint gap side, and the high fluidity flexible resin concrete is loaded with the above-mentioned substantially square shape. Stretched together with a thin stainless steel frame shaped like a letter, a backfilling member is placed adjacent to the one and the other pavement member, and a seal rubber member is compressed and inserted between one leg of the thin stainless steel frame. It is a joint construction method.

Since the structure of the expansion joint according to the present invention and the expansion joint construction method have the above-described configuration, the following effects are obtained.

That is, according to the first aspect of the present invention, one pavement member laid on one floor slab, the other pavement member laid on the other floor slab, and the one or other pavement member One and the other backfilling member formed adjacent to each other, one end leg portion that is inserted facing the joint play between the one and other backfilling members and hangs down on the joint play gap side, and the backfilling member A substantially U-shaped thin stainless steel frame that forms a set of two flat portions arranged substantially flush with each other and a second end leg portion that hangs down on the opposite side of the joint play, and the joint play, There is provided an expansion joint structure characterized by comprising a seal rubber member compression-inserted between one leg portions of a thin stainless steel frame and having a plurality of hollow portions formed vertically in the axial length direction.
Because of this structure , the joint seal rubber is not supported and installed by deformed bar studs, concrete anchors, etc. as in the prior art, the floor slab or parapet is not damaged, and the joint structure is a thin stainless steel frame and seal rubber It is composed of two parts, and has the effect of being easy to construct and improving the durability. Also, a substantially U-shaped thin stainless steel frame that consists of two parts interposed between the back-filling members is one end. A seal rubber member having a leg portion, a flat surface portion and a second end leg portion, and having a unique substantially U-shape to improve adhesion to the backfill member and to be compressed and inserted between the one end leg portions A hollow part is formed inside the seal rubber member, and the seal rubber member is brought into close contact with each other between the thin stainless steel frames by using this restoring force. There is an effect that deterioration is not induced.

According to the second aspect of the present invention, the one end leg portion of the substantially U-shaped thin stainless steel frame constituting the set is formed in a substantially arc shape in cross section, and the outer surface of the seal rubber member is compression-inserted into the one end leg portion. shape to provide a structure for expansion joint according to claim 1, characterized in that the substantially arcuate shape to conform to the shape of the end legs.
Since it was set as such a structure, in addition to the effect of Claim 1 , the outer surface shape of the said sealing rubber member by which the one end leg part of a substantially U-shaped thin plate stainless steel frame forms in a cross-sectional arc shape, and is inserted by this Since the seal rubber member once compressed and inserted is not attached to or detached from the substantially U-shaped thin stainless steel frame, it is configured to have substantially the same shape to further improve the adhesion between the two. There is an effect that can provide the structure.

According to the third aspect of the present invention, stretching of claim 1, wherein the flat portion of the substantially U-shaped thin plate stainless frames constituting the sets has a plurality bored air vent holes in a zigzag hooking manner Provide the structure of the joint.
Since this structure is adopted, in addition to the effect of claim 1 , a plurality of or a plurality of small holes are formed at a narrow pitch interval in the air vent hole in which the flat portion of the substantially U-shaped thin stainless steel frame is staggered. Since it is arranged as, it has the effect of ensuring the filling of the backfill material.

According to the fourth aspect of the present invention, stretching of claim 1, wherein the surface of the flat portion of the substantially U-shaped thin plate stainless frames constituting the sets formed the stepped surface of the comb-shaped in a series Provide the structure of the joint.
With this configuration, in addition to the effect of claim 1 , the surface of the flat portion of the substantially U-shaped thin stainless steel frame is formed in a series of comb-shaped stepped surfaces simply and quickly using a general-purpose press machine. Thus, there is an effect that a non-slip countermeasure can be easily applied by using the anti-slip action of the vehicle at the flat portion.

According to a fifth aspect of the present invention, a plurality of first rib plates having a substantially triangular cross section at a predetermined interval in the road width direction are provided on the back side of the flat portion of the substantially U-shaped thin stainless steel frame constituting the set. The expansion joint structure according to claim 1 is provided.
With such a configuration, in addition to the effect of claim 1 , the vertical load applied to the joint structure is a substantially U-shaped thin plate stainless steel that forms a set of the backfill member and the two loaded therein. The frame is supported by a plurality of first rib plates each having a substantially triangular cross section formed on the back side of each frame portion, in particular, each of the flat portions, thereby suppressing lifting due to wheel load and improving the durability of the joint structure. There is an effect of further improvement.

According to the sixth aspect of the present invention, the other end leg portion is punched at a predetermined interval in the road width direction on the other end leg portion of the substantially U-shaped thin stainless steel frame constituting the set, and the other end leg portion is formed. to provide a structure of a expansion joint according to claim 1, characterized in that a plurality deploy a second rib plates bent protruded position of approximately 45 ° from the outer surface.
With such a configuration, in addition to the effect of claim 1 , the vertical load applied to the joint structure is a substantially U-shaped stainless steel plate comprising the back-filling member and two sets loaded therein. Both sides of a plurality of second rib plates, in particular, a plurality of or a plurality of second rib plates, in which the other end legs of the frame are punched outwardly at predetermined intervals in the direction of the width of the road and are bent outward at a position of approximately 45 °. In combination with the first rib plate, in particular, it absorbs vibrations / impacts in the road width direction, and has the effect of further improving the durability of the joint structure.

According to the seventh aspect of the present invention, the joint gap is formed on the one and the other floor slabs, and the one and the other pavement members are laid and constructed, and the one end leg portion, the plane portion and the other formed in a substantially arc shape in cross section. The one leg portion of the thin U-shaped stainless steel frame constituting the pair of end leg portions is suspended and loaded on the joint gap side, and the high fluidity flexible resin concrete is loaded with the above-mentioned substantially square shape. Stretched together with a thin stainless steel frame shaped like a letter, a backfilling member is placed adjacent to the one and the other pavement member, and a seal rubber member is compressed and inserted between one leg of the thin stainless steel frame. Provide joint construction methods.
Because it is configured like this, it is placed between the other pavement member, while the other backfilling member is placed with high fluidity flexible resin concrete that has fluidity to reach a narrow location, for example Therefore, when used for many years, there is no chipping of joint corners and pavements, the back-filling member can be worn with the pavement member almost uniformly without causing a step, and the impact force due to wheel load There is an effect that it is possible to provide a construction method in the structure of the joint that can alleviate the problem.

Hereinafter, the structure of an expansion joint according to the present invention and an embodiment of the expansion joint construction method will be described in detail with reference to the accompanying drawings.

1 to 3 are examples showing the structure of the expansion joint according to the present invention and the embodiment of the expansion joint construction method, and are vertical sectional views in the direction perpendicular to the road width direction, FIG. Is an enlarged cross-sectional view in the direction of the arrow A-A in FIG. 3, showing one configuration of a substantially U-shaped thin stainless steel frame constituting a set used in the structure of the expansion joint according to the present invention, FIG. 3 is a plan view showing an overall configuration in the structure of the expansion joint according to the present invention.
Based on FIG. 1 thru | or FIG. 3, the structure of this expansion joint and this expansion joint construction method which concern on this invention are clarified by explaining this in detail.

In FIG. 1, 17 and 17 are substantially U-shaped thin plate stainless steel frames which form a set of two. The substantially U-shaped thin stainless steel frame 17 is formed by bending one plate body as one piece, and has one end leg portion 17a on one side and the other end leg portion 17b on the other side. A bent portion is formed by hanging and a substantially central portion forms a flat portion 17c. And another one is produced and a pair is comprised by both. The substantially U-shaped thin stainless steel frame 17 is a part of a so-called butt joint, and as shown in FIG. 2, the one end leg portion 17a and the substantially arc-shaped cross section 17a1 are bent from the flat surface portion 17c. The lower end projects from the folded piece 17a2. The folded piece 17a2 has a function of preventing the seal rubber member from entering downward when a later-described seal rubber member is compression-inserted into the one end leg portion 17a.

Further, the flat portion 17c of the substantially U-shaped thin stainless steel frame 17 is formed by penetrating a plurality of air vent holes 17c1 in a staggered manner at a narrow pitch interval as shown in FIG. In this embodiment, three rows are arranged in the road width direction, but the present invention is not limited to this, and various arrangement forms such as two rows or four rows may be used.
Further, the surface of the flat portion 17c of the substantially U-shaped thin stainless steel frame 17 is a press machine having a comb-shaped 17c2 in a so-called wave shape in the road width direction as shown in FIG. Press to form a stepped surface. Thus, when the vehicle travels on the road due to the step surface of the air vent hole 17c1 and the comb shape 17c2, an anti-slip action is performed and accident prevention can be achieved.

In addition, a plurality or a plurality of first rib plates 17d having a substantially triangular cross section are provided on the back surface side of the flat portion 17c of the substantially U-shaped stainless steel frame 17. Specifically, the first rib plate 17d is provided around the back side of the substantially U-shaped thin stainless steel frame 17, that is, along the back side of the one end leg portion 17a, the flat surface portion 17c, and the other end leg portion 17b, as shown in FIG. Are disposed at a predetermined interval in a direction perpendicular to the road width direction. Further, a through hole 17d1 is formed in the side surface of the first rib plate 17d substantially at the center as shown in FIG. The through-holes 17d1 are formed between the first rib plates 17d, 17d, and the front and rear thereof after the substantially U-shaped thin stainless steel frames 17 and 17 constituting the set face the joint gap D and face each other. For example, a high fluidity flexible resin concrete or the like as a material of the backfill member described later has the effect of flowing.
The first rib plates 17d, 17d... Function as a reinforcing material, and the one end leg portion 17a and the other end leg portion 17b of the thin stainless steel frames 17 and 17 constituting the set are expanded due to long-term use. In addition to preventing the rise and tilt phenomenon.

Further, the other leg 17b of the substantially U-shaped thin stainless steel frames 17 and 17 constituting the pair is directed outward from the inner side surface of the second rib plate 17b1 having a substantially rectangular shape as shown in FIG. Punching and bending. Then, the bending angle θ from the outer surface of the other end leg portion 17b is set to, for example, about 45 ° as shown in the figure, and the other end leg portion 17b is formed to project outward. At this time, one of the substantially U-shaped thin stainless steel frames 17 constituting the set and the other substantially U-shaped thin stainless steel frame 17 have the second rib plates 17b1 and 17b1 inclined in the opposite direction, as shown in the figure. In addition, when an impact force or vibration is applied in the direction of the width of the road, for example, in the directions of arrow B and arrow C, the load is absorbed and absorbed by the second rib plates 17b1 and 17b1 on the left and right sides as viewed from FIG.

Reference numeral 18 denotes a seal rubber member that is compression-inserted between one end leg portions 17a and 17a of the substantially U-shaped stainless steel frames 17 and 17 constituting the set of the above two, and has a shaft length in the road width direction. It is comprised by the cross-sectional substantially tulip shape as a cylindrical body comprised by this and having roundness.
In addition, the seal rubber member 18 forms a single cavity or a plurality of, for example, two cavities 18a and 18b defined vertically, and the two illustrated cavities 18a and 18b The support portion 18c is formed in a direction substantially perpendicular to the axial direction. The seal rubber member 18 is formed in an arc shape so that the left and right side surface shapes match the arc shape 17a1 of the one end leg portion 17a of the substantially stainless steel frames 17 and 17 having the substantially U shape. And when this seal rubber member 18 is compression-inserted between the one end leg parts 17a and 17a of the said thin plate stainless steel frames 17 and 17, both will be fixed to a close_contact | adherence state. Further, the surface of the seal rubber member 18 is formed in a mountain shape and absorbs the expansion and contraction action in the direction perpendicular to the road width direction.

In FIG. 1, reference numerals 19 and 19 denote substantially the same structure as that of the prior art, and the other is a floor slab or a parapet. 20 and 20 are the other pavement members laid on the one and the other floor slabs 19 and 19 or the parapet.

21 and 21 are placed or formed adjacent to the one and the other pavement members 20 and 20, respectively, and the other back-filling member, for example, formed of aggregate and glass member using a flexible acrylic resin as a binder The above-described high fluidity flexible resin concrete is used.
The high fluidity flexible resin concrete is formed after many years of use after the opening of traffic between the one and the other pavement members 20 and 20 and the one and the other backfilling members 21 and 21 having a difference in wear amount. In order to prevent the difference in level, a part of the aggregate is replaced with glass cullet, and the degree of abrasion of the one and the other pavement members 20 and 20 and the one and the other backfill members 21 and 21 is made uniform. It is configured as follows.
Further, according to experiments, for example, recycled glass is used as the glass cullet, and the bending strength applied to the joint structure is increased by including 30% of the maximum particle size of 3 mm or less with respect to 100% of the aggregate. It has also been found that bending slackness or compressive strength, and further the amount of abrasion can be configured as backfilling members 21 and 21 corresponding to the one and the other pavement members 20 and 20, respectively.

Next, the assembly, construction procedure or operation of the expansion joint structure according to the present invention will be described to clarify the expansion joint construction method.
When installing the expansion joint on a concrete floor slab or parapet, etc., on the other floor slab 19, 19 and between the one and the other pavement members 20, 20, i.e. adjacent sites, In general, when it is repair work, the existing joint is removed. In addition, in the case of a new road construction, a joint clearance D is formed on the other floor slabs 19 and 19, and the one and the other pavement members 20 and 20 are laid.
Then, the substantially U-shaped thin stainless steel frames 17 and 17 having a set of the above two and having a strong non-rusting function are suspended from, for example, an angle, and the substantially U-shaped thin stainless steel frame 17 is hung. , 17 are set at the corners of the so-called joints facing the one end leg portions 17a, 17a and facing the joint clearance D.

Next, for example, the above-described high fluidity flexible resin concrete produced with an aggregate and a glass member using a flexible acrylic resin as a binder is placed between the one and the other pavement members 20 and 20. In this way, the high fluidity flexible resin concrete has a long time after the opening of traffic between the one and the other pavement members 20 and 20 and the one and the other backfilling members 21 and 21 having a difference in wear amount. In order to prevent the level difference formed through the use of the above, the one part of the aggregate is replaced with a glass cullet, and the one and the other pavement members 20 and 20 and the one and the other backfilling members 21 and 21 are worn down. Work to make the degree uniform. Thus, the substantially U-shaped thin stainless steel frames 17 and 17 constituting the set of the two according to the present invention are loaded, and the other backfilling members 21 and 21 are placed or formed to complete. . And the said one and the other backfilling members 21 and 21 are cured.

After the other back-filling member 21, 21 has been cured, the sealing rubber member 18 having a round shape having a substantially tulip shape or the like has the axial length corresponding to the road width direction. The substantially U-shaped thin stainless steel frames 17 and 17 constituting the set are compressed and inserted between the respective one end leg portions 17a and 17a. At this time, the seal rubber member 18 is formed in an arc shape so that the left and right side surface shapes match the arc shape 17a1 of the one end leg portion 17a of the thin stainless steel frames 17, 17 having the substantially U-shape. And when this seal rubber member 18 is compression-inserted between the one end leg parts 17a and 17a of the said thin plate stainless steel frames 17 and 17, both will be fixed to a close_contact | adherence state.
The bottom surface of the seal rubber member 18 is opposed to the bent pieces 17a2 and 17a2 of the one end leg portions 17a and 17a of both the substantially U-shaped thin stainless steel frames 17 and 17 constituting the pair. In order to prevent excessive push-in, entry of the seal rubber member 18 downward is prevented.
And traffic opening is carried out.

Thus, the expansion joint construction method according to the present invention is particularly suitable for installation on various roads, for example, for steel bridges between small spans and for all types of side bridges between small spans. A joint gap is formed on the floor slab, and one and the other pavement members are laid and constructed, and a pair is formed by forming one end leg portion, a flat portion, and the other end leg portion having a substantially arc cross section. In the substantially U-shaped thin stainless steel frame, the one end leg is suspended and loaded on the joint gap side, and the high-fluidity flexible resin concrete is placed together with the substantially U-shaped thin stainless steel frame, A backfilling member is placed adjacent to the other pavement member, and a seal rubber member is compression-inserted between one end legs of the thin stainless steel frame, and is installed between the other pavement members. The other back-filling member For example, since it is constructed with a high fluidity flexible resin concrete that has fluidity to go to narrow places, there is no dropout in joint corners and pavements when used for many years. However, it is possible to provide a construction method in the structure of a joint that can be worn almost uniformly without causing a level difference with the pavement member and can reduce the impact force caused by the wheel load.

BRIEF DESCRIPTION OF THE DRAWINGS It is an example which shows embodiment of the structure of the expansion joint which concerns on this invention, and this expansion joint construction method, Comprising: It is a vertical sectional view in a direction perpendicular to the road width direction. FIG. 4 is an enlarged cross-sectional view taken along the line AA in FIG. 3, showing one configuration of a substantially U-shaped thin stainless steel frame constituting a set used for the structure of the expansion joint according to the present invention. It is a top view which shows the whole structure in the structure of the expansion joint which concerns on this invention. It is a vertical sectional view which shows an example of the road bridge expansion-contraction apparatus in a prior art.

Explanation of symbols

17 A substantially U-shaped thin stainless steel frame 17a One end leg portion 17a1 of a substantially U-shaped thin plate stainless steel frame A cross-section of one end leg portion of a substantially U-shaped thin plate stainless steel frame 17a2 A substantially U-shaped thin plate stainless steel frame Folded piece 17b of the one end leg portion The other end leg portion 17b1 of the substantially U-shaped thin stainless steel frame The second rib plate 17c of the approximately U-shaped thin stainless steel frame The flat portion 17c1 of the approximately U-shaped thin stainless steel frame Air vent 17c2 in the flat portion of the flat stainless steel frame shape Comb shape 17d in the flat portion of the substantially U-shaped thin plate stainless steel frame First rib plate 17d1 of the substantially U-shaped thin plate stainless steel frame 1st rib plate through-hole 18 Seal rubber member 18a Seal rubber member cavity 18b Seal rubber On the other hand the supporting portion 19 of the cavity 18c sealing rubber member of wood, the other slab (parapet)
20 On the other hand, the other pavement member 21 On the other hand, the other backfilling member D

Claims (7)

One pavement member laid on one floor slab, the other pavement member laid on the other floor slab, and the other backfilling member formed adjacent to the one or other pavement member And one end leg portion that is inserted oppositely between the joint gaps between the one and the other backfilling members and hangs down on the side of the joint gaps, a flat surface portion that is substantially flush with the backfilling member, and the joints A substantially U-shaped thin stainless steel frame that forms a set of two other leg portions that hang down on the opposite side of the gap, and a joint between the one end legs of the thin stainless steel frame. A structure of an expansion joint, comprising: a seal rubber member that is mounted and has a plurality of cavities formed vertically in the axial direction. One end leg portion of the substantially U-shaped thin stainless steel frame constituting the set is formed in a substantially arc shape in cross section, and the outer surface shape of the seal rubber member that is compression-inserted into the one end leg portion matches the shape of the one end leg portion. The expansion joint structure according to claim 1, wherein the expansion joint has a substantially arc shape. The expansion joint structure according to claim 1, wherein a plurality of air vent holes are formed in a staggered manner on a flat portion of the substantially U-shaped thin stainless steel frame constituting the set. 2. The structure of an expansion joint according to claim 1, wherein the surface of the flat portion of the substantially U-shaped thin stainless steel frame constituting the set is formed with a series of comb-shaped stepped surfaces. 2. A plurality of first rib plates each having a substantially triangular cross section at a predetermined interval in the road width direction on the back side of the flat portion of the substantially U-shaped thin stainless steel frame constituting the set. Expansion joint structure. The other end leg of the substantially U-shaped thin stainless steel frame constituting the set is punched at a predetermined interval in the road width direction and folded at a position of about 45 ° from the outer surface of the other end leg. 2. The structure of an expansion joint according to claim 1, wherein a plurality of second rib plates formed to bend and project are provided. A joint gap is formed on one and the other floor slab, and one and the other pavement members are laid and assembled. The one leg portion of the substantially U-shaped thin plate stainless steel frame constituting the frame is suspended and loaded on the joint gap side, and a high-fluidity flexible resin concrete is placed together with the substantially U-shaped thin plate stainless steel frame. An expansion joint construction method in which a backfilling member is placed adjacent to the one and the other pavement members, and a seal rubber member is compression-inserted between one end legs of the thin stainless steel frame.

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