JP5620687B2 - Telescopic device used for bridge and method for manufacturing the same - Google Patents

Description

The present invention is a girder and girder (floor slab and floor slab) supported by the abutment and girder end or the pier that absorbs and relaxes the thermal expansion and contraction that changes depending on the season in bridge joints such as viaducts and road bridges The present invention relates to a buried type expansion and contraction device installed in each of the gaps formed between the two and a manufacturing method thereof.

As a conventional joint structure of a bridge, a waterproof sheet is laid across the gap by fixing both ends in the width direction on the upper surface of the frame located on both sides of the gap secured in the joint of the bridge. A downwardly protruding U-shaped curved portion formed at the center in the width direction of the sheet is inserted between the play, and a backup material made of an elastic material is inserted inside the U-shaped curved portion, including the upper side of the backup material A special pavement having elasticity is laid on the upper side of the waterproof sheet, and the pavement is placed on the upper side of the special pavement so as to be flush with the pavement before and after the joint. There is an invention (Patent Document 1).

Further, the bridge joint structure according to claim 1 described in Patent Document 1 is an invention in which the backup material has a cylindrical shape having a through hole at the center (Patent Document 1).
Further, the bridge joint structure according to claim 2 described in Patent Document 1 is an invention in which a water guide hole communicating with the through hole is formed in a peripheral wall of the backup material (Patent Document 1). ).

Furthermore, the bridge joint structure according to claim 2 or 3 described in Patent Document 1 is an invention in which the backup material has a cylindrical shape (Patent Document 1).
Moreover, the bridge joint structure according to any one of claims 1 to 4 described in Patent Document 1 is an invention in which the backup material is formed of a resin foam molded body that has been waterproofed. Yes (Patent Document 1).

Furthermore, the joint part structure of the bridge according to any one of claims 1 to 5 described in Patent Document 1 is an extension direction of the play on a pavement placed on the upper side of the special pavement material. This is an invention in which a cutting joint is provided along the line and an elastic material is filled in the cutting joint (Patent Document 1).
Furthermore, the bridge joint structure according to claim 6 described in Patent Document 1 is an invention in which the elastic material filled in the cutting joint is an asphalt emulsion resin (Patent Document 1).

And the joint part structure of the bridge of any one of Claims 1-7 described in the said patent document 1 uses the normal temperature asphalt mixture which used asphalt emulsion resin the binder as the said special pavement material. (Patent Document 1).
Furthermore, the bridge joint structure according to any one of claims 1 to 8 described in Patent Document 1 is an invention in which a waterproof processed product of an aramid fiber sheet is used as the waterproof sheet. Reference 1).

JP2007-46365A

  The invention of the above-mentioned patent document 1 can prevent the special pavement material and the pavement from falling into the gap, and can absorb the expansion and contraction of the bridge internally by the elasticity of the special pavement. It is described that it is possible to minimize the influence of expansion and contraction.

  However, the invention of Patent Document 1 has a drawback that a special pavement material that functions as a telescopic device provided directly below a pavement on which a vehicle or the like travels cannot sufficiently absorb the effects of expansion and contraction of the bridge. In addition, the special pavement material itself is not strong enough to withstand the weight of the traveling vehicle or the like on the pavement, and there is a problem that plastic deformation occurs with respect to the load strength.

  In addition, in the invention of Patent Document 1, a primer (adhesive) is applied to the boundary surface between the waterproof sheet and the concrete of the left and right floor slabs with a gap between them and the boundary surface between the special pavement material and the pavement. In addition, the special pavement material is directly subjected to the expansion and contraction of the bridge. From this point of view, there was a limit to the internal absorption of the expansion and contraction of the bridge by the special pavement material.

Furthermore, in the invention of Patent Document 1, when the clearance between the joint portions of the left and right floor slabs is narrow, it is difficult to attach a backup material made of a cylindrical foam molded body.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an expansion / contraction device for a bridge in which the effect of the expansion / contraction phenomenon at the joint portion of the bridge is greatly improved so as not to interfere with the pavement. And a manufacturing method thereof.

The expansion and contraction device used for the bridge according to the present invention is a container-shaped space portion whose upper surface is opened between floor slabs located on the left and right or between the roadbed and the floor slab across a gap secured in a joint portion of the bridge. In order to form the left and right floor slabs, or the side wall formed in the road width direction of the roadbed and the floor slab, and a notch portion having a rectangular cross section provided with the side walls formed in the left and right direction, A slide sheet and / or a separating material is laid on the bottom surface of the cut-out portion of the shape so as to straddle the gap, and the Poisson is formed over the entire container-shaped space portion of the cut-out portion having the rectangular cross section on the slide sheet and / or the separation material. ratio is 0.1 to 0.5, with an elastic modulus ^{6.5 × 10~1.0 × 10 3 N /} mm 2, compression strength is at 0.1~15.0N / mm ^2, bending strength in 0.1~12.0N / mm ^2, the characteristics of the amount of deflection is 1.0~20mm Filled with an elastic mortar comprising, elastic mortar binder, coarse foam, particulate foam, silica sand, as a main component a predetermined fiber length of the fiber cement and a predetermined thickness, said pavement the upper surface of the elastic mortar It is characterized by being covered in a sealed manner.

According to the invention of claim 2, the elastic mortar can disperse and absorb between the lower surface of the elastic mortar of claim 1 and the contact surface between the notched floor slab upper surface or the abutment upper surface with the expansion and contraction of the bridge. A separating material is provided over the width.

According to a third aspect of the present invention, in the elastic mortar constituting the expansion / contraction device used for the bridge according to the first aspect, a part of a contact portion between a lower surface thereof and the notched left and right floor slab upper surfaces or upper abutment upper surfaces It is characterized in that a separating material made of silica sand or sand is provided so as to be free from each other.

According to a fourth aspect of the present invention, a crack prevention sheet for preventing the influence of cracks on the elastic mortar generated as a result of expansion and contraction of the bridge is embedded in one layer or a plurality of layers in an intermediate portion of the elastic mortar according to the first aspect. It is characterized by.

A fifth aspect of the present invention, the intermediate portion of the elastic mortar according to claim 1, comprising a separating member which also serves as a waterproof bottom surface of the elastic mortar with embedded one or more layers of cracking prevention sheet separation A sheet is provided.

In the sixth aspect of the present invention, when the play portion according to claim 1 is not narrow, sand or dredged sand is filled in the space surrounded by the cylindrical backup material loaded at the lower portion of the play portion and the lower surface of the elastic mortar. It is characterized by that.

The manufacturing method of the expansion and contraction device used for the bridge according to the present invention is a container shape in which the upper surface is opened between the floor slabs positioned on the left or right across the gap secured in the joint portion of the bridge or between the roadbed and the floor slab. In order to form the space portion of the container, the left and right floor slabs or the side walls of the road base and the floor slab, and the upper side which is a cutout portion having a rectangular cross section provided with the side walls in the left and right direction are opened. A step of preliminarily forming the space portion , a step of closing the gap secured in the joint portion of the bridge with an elastically deformable material, a gap portion facing the notch portion having a rectangular cross section, and the gap portion Before filling the upper surface of the floor slab notched in a rectangular shape of the left and right so that the elastic mortar is filled, the lower surface of the elastic mortar and the upper surface of the notched floor slab are not fixed to each other. as part of each other to become free the A step of laying Hanarezai, the components and characteristics of claim 1, wherein the rectangular cross section of the cutout portion having a side wall and a side wall in the lateral direction of each of the road width direction of the slab or between roadbed and deck A step of filling the provided elastic mortar, a step of embedding a crack prevention sheet for preventing cracking of the elastic mortar at an intermediate portion of the elastic mortar, and a step of embedding the elastic mortar on the upper surface of the floor slab. And a step of filling the upper surface of the roadbed so as to be flush with the upper surface of the roadbed, and the upper surface of the elastic mortar is provided with a step of sealingly covering with a pavement.

The expansion and contraction device used for the bridge according to the present invention is characterized in that the Poisson's ratio, the elastic modulus, the compressive strength, the bending strength, and the amount of deflection as the characteristics of the elastic mortar are experimentally specified within the allowable numerical range, thereby connecting the joint portion of the bridge. The elastic mortar itself can disperse and absorb the expansion and contraction effect without affecting the pavement directly. In addition, the elasticity and strength that the elastic mortar itself can sufficiently withstand the strength of the elastic mortar without being deformed by the running load of the vehicle or the like applied to the pavement, in combination with the ability to disperse and absorb the expansion and contraction action at the joint. It is possible to solve the conflicting conditions at the same time.

Further, according to the present invention, the lower surface of the elastic mortar is bonded in a certain range of right and left including the loose portion of the upper surface of the floor slab notched in a rectangular cross section having both side walls in the road width direction for forming the closed space portion. Since the separating material is provided so as to be in a free state, the floor slab that faces the play even when the expansion and contraction of the floor slab and the elastic mortar are in pressure contact with the floor slab during the thermal expansion and contraction of the bridge When the material expands and contracts back and forth, it moves in a kind of sliding state due to the action of the separating material , and as a result of the expansion and contraction movement separated without the integral expansion and contraction movement with the elastic mortar, the dispersion absorption possessed by the elastic mortar Combined with the ability, cracks and bumps on the pavement are eliminated.

Furthermore, by laying a slide sheet with a waterproof function as an adhesive separation material at the site corresponding to the adhesion separation width with the floor plate centering on the play gap, water does not flow between play gaps, and cracks on the pavement also from this surface In addition to being able to eliminate the occurrence and uplift phenomenon, it can also provide a waterproof effect.

In particular, in a portion where the space between the gaps is narrow, it is only necessary to simply fill the foamed resin material without using a cylindrical backup material made of a foam. In addition, a crack prevention sheet is not required at a location where the space between the play is narrow.

On the other hand, when the width of the play is a normal width or wide width, the expansion and contraction of the bridge also increases, so that the elastic mortar itself has a dispersion absorbing ability by laying a crack prevention sheet at an intermediate portion in the elastic mortar. The cracking of the elastic mortar is prevented on the top, and the deformation of the road surface to the pavement accompanying expansion and contraction of the bridge is eliminated.

In the present invention, the elastic mortar is used to eliminate the influence of the expansion and contraction of the bridge, but the filling portion of the elastic mortar has a rectangular cross section provided with both side walls for forming a closed space portion in the floor slab. Since the pavement that the vehicle etc. travels directly is formed on the floor slab upper surface and the elastic mortar upper surface that are notches, it is only necessary to scrape only the pavement in the repair work of the pavement, The elastic mortar has the same height as the floor slab, and can be used as it is without being scraped off during the paving work. Moreover, steel and rubber materials appear on the surface of the pavement at the joint part of the conventional bridge, but in the present invention, the surface of the elastic mortar is covered with the pavement in a sealed manner instead of the joint. It is also freed from environmental noise caused by vibrations when the vehicle is running.

According to the method of the present invention, troubles such as cracking of the pavement due to expansion and contraction in the joint portion of the bridge are solved, and the replacement of the expansion device itself is greatly reduced, so that the repair work of the road pavement is greatly reduced. This reduces the budget for wasteful countries and local governments, and shortens the installation work of the telescopic device.

It is sectional drawing of the expansion-contraction apparatus used for the bridge which shows one Example of this invention. It is sectional drawing of the expansion-contraction apparatus used for the bridge which shows the other Example of this invention. It is sectional drawing of the expansion-contraction apparatus used for the bridge which shows the other Example of this invention. It is sectional drawing of the expansion-contraction apparatus used for the bridge which shows the other Example of this invention. It is sectional drawing of the expansion-contraction apparatus used for the bridge which shows the other Example of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1 and FIG. 2, the width of the gap 2 is explained for the case of a normal interval or a wide interval, and the case where the cylindrical backup material 3 made of foam and the sand or quartz sand 4 are filled thereon are described. As described above, when the gap 2 is narrow, as shown in FIGS. 3 to 5, the space is filled with a material (not shown) made of synthetic resin foam.

Reference numeral 1 denotes a telescopic device used for a joint portion of a bridge. There are various types of joints in the bridge, such as when a gap 2 is provided between the opposite ends of the floor slab 5 or girder (hereinafter referred to as a floor slab) supported by the pier and when the floor slab 5 is supported by the abutment. Although the form is conceivable, it is applicable to both cases. In this example, the case of the ends of the floor slab 5 will be described.

The expansion / contraction device 1 is provided at the joint portion of the bridge, but the floor slabs 5 and 5 located on the left and right sides with the secured gap 2 between them are formed in a road width direction for forming a closed space portion on the opposing upper end surfaces. A notch 6 having a rectangular cross section provided with both side walls is previously formed in a factory or the like. The gap 2 is filled with an elastic material in advance, and the upper surface of the filling is formed at the same height as the bottom surface 5a of the floor slab 5 in which the cutout portion 6 having a rectangular cross section is formed (FIGS. 3 to 5). Or a slightly higher flat shape (see FIGS. 1 and 2).

An elastic mortar 7 is filled in a cutout portion 6 having a rectangular cross section provided with both side walls for forming a closed space portion of the floor slab 5. The elastic mortar 7 has a Poisson's ratio of 0.1 to 0.5, an elastic modulus of 6.5 × 10 to 1.0 × 10 ⁴ N / mm ² , and a compressive strength of 0.1 to 15.0 N / mm. It is a material having the characteristics of mm ² , bending strength of 0.1 to 12.0 N / mm ² , and deflection of 1.0 to 20 mm. The elastic modulus is more preferably 6.5 × 10 to 1.0 × 10 ³ N / mm ² . The reason why the elastic mortar 7 is specified in such a numerical range is that the elastic mortar itself can disperse and absorb the expansion / contraction action at the joint portion of the bridge without directly affecting the pavement, and the pavement. This is for simultaneously solving the contradictory conditions of elasticity and strength that the elastic mortar can sufficiently withstand the strength without being deformed by a traveling load of the vehicle or the like.

The components of the elastic mortar 7 contain a binder, an aggregate (coarse material and intermediate material), cement and fiber as main components. When the volume ratio of each component is blended at a ratio of 1: 1, the binder is 1000 g, the aggregate is 100-600 g of coarse foam (crude), 50-400 g of granular foam (intermediate) and silica sand No. 4 The aggregate (coarse) is 0 to 900 g, silica sand No. 7 (silica), cement 30 to 600 g, and the fiber having a predetermined fiber length is 20 to 50 g. When blending the above components, the elastic mortar 7 itself can exert the function of dispersing and absorbing the expansion and contraction action at the joint portion of the bridge, while at the same time having mechanical properties that can withstand the weight of a vehicle or the like traveling on the pavement. It is necessary to consider. However, in the present invention, the space filled with the elastic mortar 7 is a closed space formed by a cutout portion having a rectangular cross section of the floor slab 5 which is a kind of sealed space and the lower surface of the pavement 8 covering the cutout portion. In addition, it is necessary to consider that the elastic mortar 7 is filled and formed.

The elastic mortar 7 is formed such that the upper end surface provided with both side walls in the road width direction for forming a closed space portion of the floor slab 5 facing left and right across the gap 2 is cut out in a rectangular cross section. The side walls (not shown) of the front end portion and the rear end portion in the width direction 5 are not cut off and are left as side walls. That is, the upper and lower side walls of the floor slab 5 facing left and right across the gap 2 are formed so as to be cut out in a rectangular cross section, and the front and rear side walls are formed by the front end portion and the rear end portion in the width direction of the floor slab 5 (see FIG. (Not shown), a container-shaped space having an open upper surface is formed. The upper surface of the container-shaped space portion is the same height as the upper end surface of the floor slab 5 that is not cut out, and is formed flush. The container-shaped space is filled with the elastic mortar 7 so as to fill the entire space. The upper surface of the filled elastic mortar 7 is covered with a pavement 8, so to speak, the closed space is filled with the elastic mortar 7 filled. The pavement 8 is shown in FIGS. 1 to 5 in which a high-performance asphalt mixture 8a (modified type 2) is used as a surface layer and a mastic asphalt mixture (modified type 2) is used as a base layer. Is not limited to this.

One or a plurality of crack prevention sheets 9 over a range in which the influence of cracks on the elastic mortar 7 due to the expansion and contraction of the bridge extends from the intermediate portion in the elastic mortar 7 corresponding to the gap 2 to the right and left. Lay it down (see Figure 1 and Figure 3). In this example, an aramid triaxial mesh sheet (an aromatic polyamide fiber with extremely high tensile strength, elasticity, and heat resistance) was used as the crack prevention sheet 9, but this is not a limitation, and crack prevention is effective. Other materials and sheets may be used as long as they are made. Since the normal cracking phenomenon associated with the expansion and contraction of the bridge occurs in the elastic mortar 7 corresponding to the two gaps, the elastic mortar 7 itself can disperse and absorb the expansion and contraction phenomenon of the bridge, but more effective cracking. From the viewpoint of preventing the crack, the crack prevention sheet 9 is adopted.

Reference numeral 10 denotes a slide sheet laid on the bottom surface of the cutout portion 6 having a rectangular cross section. The contact surfaces of the elastic mortar 7 and the floor slab 5 are in contact with each other in a free state (see FIGS. 1 to 4). This is because, when both are fixed with an adhesive, anchor bolts or the like as in the prior art, the elastic mortar 7 itself is also interlocked by the thermal expansion and contraction of the bridge, thereby eliminating the direct influence on the cracks on the pavement 8. Further, a separating material 11 such as sand or silica sand may be used instead of the slide sheet 10 (see FIG. 5). Further, as shown in FIGS. 1 to 4, the slide sheet 10 and sand or silica sand or the like are separated. The material 11 may be used in combination. The laying range of the slide sheet 10 and the separating material 11 is a range in which the influence of cracks accompanying the expansion and contraction of the bridge is conceived over a predetermined width of the left and right elastic mortars 7 from the part corresponding to the gap 2 and the range in which the cracks can be dispersed and absorbed. It is.

As components of the elastic mortar, the binder is 1000 g of alpha sol (trade name), the aggregate (coarse) is 150 to 500 g of coarse foam, the aggregate (intermediate) is 60 to 300 g of granular foam, and the aggregate (coarse) ) Is silica sand No. 4 to 85 g, aggregate (intermediate) silica sand No. 7 to 700 g, ordinary Portland cement 100 to 600 g, and 15 μm thick 12 mm long fiber 28 to 64 g as the main components The ratio was mixed in a 1: 1 ratio.
The gap width between the play was 80 mm, and the space was filled using a cylindrical urethane molded body and silica sand No. 4. The pavement used a modified type 2 asphalt mixture.

As a result of the performance test of the elastic mortar, the Poisson's ratio is 0.1 to 0.5, the elastic modulus is 6.5 × 10 to 1.0 × 10 ³ N / mm ² , and the compressive strength is 0.1 to 15. The 0 N / mm ² bending strength was 0.1 to 12.0 N / mm ² and the deflection was 1.0 to ²⁰ mm.

One aramid triaxial mesh sheet was laid in the middle part of the elastic mortar of Example 1 over a predetermined width from the gap part, and a slide sheet and sand or quartz sand were laid on the bottom of the elastic mortar. As a result, the ability of the elastic mortar was further exhibited.

DESCRIPTION OF SYMBOLS 1 Expansion / contraction apparatus 2 Spacing space 3 Back-up material 4 Sand or quartz sand 5 Floor slab 5a Bottom surface 6 Notch part of rectangular cross section 7 Elastic mortar 8 Pavement 8a High-performance asphalt mixture 8b Mastic asphalt 9 Crack prevention sheet 10 Slide sheet

Claims (7)

The left and right floor slabs are formed in order to form a container-shaped space portion whose upper surface is opened between the floor slabs located on the left and right sides of the gap secured in the joint part of the bridge or between the roadbed and the floor slab. Alternatively, a notch portion having a rectangular cross section provided with a side wall formed in the road width direction and a side wall formed in the left-right direction of the roadbed and the floor slab is formed, and a gap is crossed over the bottom surface of the notch portion having the rectangular cross section. As described above, the slide sheet and / or the separating material are laid, and the Poisson's ratio is 0.1 to 0.5 over the entire container-shaped space portion of the cutout portion having a rectangular cross section on the slide sheet and / or the separating material, in the elastic coefficient ^{6.5 × 10~1.0 × 10 3 N /} mm 2, the compression strength of 0.1~15.0N / mm ^2, bending strength of 0.1~12.0N / mm ² And filling an elastic mortar having a characteristic of a deflection amount of 1.0 to 20 mm. Rutaru binder, coarse foam, particulate foam, sand, fiber cement and a predetermined fiber length as a main component, is used in bridges, wherein the coating sealingly the upper surface of the elastic mortar pavement stretch apparatus. Between the lower surface of the elastic mortar constituting the expansion / contraction device used for the bridge and the contact surface between the notched floor slab upper surface or the abutment upper surface, the width can be dispersed and absorbed by the elastic mortar as the bridge expands and contracts. The expansion / contraction apparatus used for the bridge according to claim 1, further comprising a separating member . The elastic mortar constituting the expansion and contraction device used for the bridge is made of silica sand or sand so that a part of a contact portion between a lower surface portion thereof and the notched left and right floor slab upper surfaces or abutment upper surfaces is mutually free. The expansion / contraction apparatus used for the bridge according to claim 1, wherein a separating member is provided. The middle part of the elastic mortar constituting the expansion / contraction device used for the bridge has a crack prevention sheet embedded in one layer or a plurality of layers for preventing the influence of the crack on the elastic mortar caused by the expansion / contraction of the bridge. A telescopic device used for a bridge according to any one of claims 1 to 3 . In the middle part of the elastic mortar constituting the expansion and contraction device used for the bridge, one or more layers of a crack prevention sheet are embedded, and a separation sheet serving as a separation material also serving as a waterproof is provided on the lower surface of the elastic mortar. The telescopic device used for the bridge according to any one of claims 1 to 4 , wherein the telescopic device is used. When the gap portion of the telescopic device used for the bridge is not narrow, the space portion surrounded by the cylindrical backup material and the lower surface of the elastic mortar loaded at the lower portion of the gap portion is filled with sand or dredged sand. The expansion-contraction apparatus used for the bridge in any one of Claims 1 thru | or 5 . The left and right floor slabs are formed in order to form a container-shaped space portion whose upper surface is opened between the floor slabs located on the left and right sides of the gap secured in the joint part of the bridge or between the roadbed and the floor slab. Alternatively, a step of forming in advance a container-shaped space portion that is a notch portion having a rectangular cross section having a side wall in the road width direction and a side wall in the left-right direction of the roadbed and the floor slab , and a joint portion of the bridge A step of closing the gap between the gaps secured by the elastically deformable material, the gap between the gaps facing the cutout portion having the rectangular cross section and the upper surface of the floor slab cut into a rectangular shape on the left and right across the gap between the gaps Before filling to fill the mortar, lay the separating material so that part of the contact part is free from each other so that the lower surface of the elastic mortar and the notched floor slab upper surface do not stick a step of, the floor plate or between the road A step of filling an elastic mortar comprising a component and a characteristic of claim 1, wherein the rectangular cross section of the cutout portion having a side wall and a side wall in the lateral direction of each of the road width direction of the slab and, of the elastic mortar A step of embedding one or more layers of a crack prevention sheet for preventing cracking of the elastic mortar in an intermediate portion, and a step of filling the elastic mortar so as to be flush with the upper surface of the floor slab and the upper surface of the roadbed And a method of manufacturing a telescopic device for use in a bridge, wherein the upper surface of the elastic mortar is covered with a pavement in a sealed manner.

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