JP5875855B2 - Block type buried joint expansion and contraction device for bridge - Google Patents

Description

The present invention relates to a bridge-type buried joint expansion / contraction device for a bridge, for example, which constitutes a road bridge structure on a river, a canyon, an elevated road, various roads, and the like, and is installed in a pavement.

Conventionally, as a first example of a telescopic device in this kind of technology, disclosed in Japanese Patent Application Laid-Open No. 2011-17152 shown in FIGS. 8 (a) and 8 (b) and FIGS. 9 (a) and 9 (b). Technology has been developed.
Explaining this, 1a, 1b, 1c, 1d and 1e are blocks obtained by dividing the embedded joint 1, 2 is a bolt as a rod-shaped body, 3 is a cylindrical body, 4 is a nut, 5 is a box for connecting , 6 is an anchor bolt box opening part, 7 is a joint gap, 8 is a stretchable material, and a filler is injected into the connecting box opening part 5. All the blocks are made of ultra high strength fiber reinforced concrete. The bolt 2, the cylindrical body 3, and the nut 4 constitute a connector. In this example, the embedded joint 1 has five blocks as shown in FIGS. 8A and 8B and FIGS. 9A and 9B, but can be applied from three blocks. In the block 1b and the block 1d, a bolt 2 is embedded so as to be fitted in a cylindrical body 3 embedded in each of the adjacent blocks 1a, 1c and 1e. Reference numeral 6 denotes an anchor bolt box opening portion when the embedded joint 1 is attached to the floor slab. Here, the bolt 1 with respect to each is embedded so that the block 1c can respond | correspond to the cylindrical body 3 embedded at the blocks 1b and 1d which adjoin on both sides. In the blocks 1b and 1d, a cylindrical body 3 into which the bolt 2 embedded in the adjacent blocks 1a, 1b and 1c is inserted is embedded in a predetermined portion corresponding to the bolt 2. The boxes 1b and 1d are formed with box-cutting portions 5, which are connecting box-cutting portions between the bolts 2 of the blocks 1a, 1c and 1e and the cylindrical bodies 3 of the blocks 1b and 1d. The bolt 2 is inserted into the cylindrical body 3 and protrudes from the box opening portion 5. The blocks shown in FIGS. 9A and 9B are connected as shown in FIGS. 10A and 10B. First, in the blocks 1 a, 1 b, 1 c, 1 d, and 1 e, the bolts 2 of adjacent blocks are inserted into the cylindrical body 3, and the bolt 2 and the nut 4 are coupled via the box-cutting portions 5. At this time, a necessary joint gap 7 is provided so that the entire embedded joint 1 can be expanded and contracted, and an elastic material 8 such as EPDM sponge is interposed in the joint gap 7. In addition, the overall elongation can be adjusted by using bolts and nuts. As shown in FIGS. 9A and 9B, a filling material such as a non-shrink mortar is poured into the box opening portion 5 to form the embedded joint 1 as a whole.

Conventionally, as a second example of a telescopic device in this type of technology, there is a technology disclosed in Japanese Patent Laid-Open No. 10-298907 shown in FIG.
To explain this, the left and right bridge girders 9 and the floor slab 10 of the bridge surface are placed on the seismic isolation device 11A on the bridge pier 11 and arranged with an expansion and contraction gap 12 therebetween. Are provided with a backup material 13 and a joint material 14 for preventing leakage of rainwater and the like.
When manufacturing the embedded joint member 15, first, a film or sheet of, for example, UHMW-PE (ultra high molecular weight polyethylene, molecular weight 1 to 6 million) constituting the sliding layer 16 is placed on a flat molding table. The load supporting member 17 is disposed on the central portion, and two connecting members 18 are disposed at both ends thereof. The load supporting member 17 and the connecting member 18 are pre-coated with a rubber composition in order to strengthen the adhesion to the elastic layer and to absorb the vibration of the vehicle. Next, a sheet-like general-purpose unvulcanized rubber composition is placed on these members as an elastic body layer, and temporarily bonded with a pressure roller. Further, a core reinforcing layer such as a twisted cord made of synthetic fibers or fibers such as steel, and an unvulcanized rubber composition and an adhesive layer 19 are laminated on the layer while sequentially pressing the intermediate body of the embedded joint member 15. Pre-mold. Next, an upper heating plate and a lower heating plate are attached as molds to a press equipped with a heat source supply device such as steam that can be moved up and down. By inserting the intermediate body between the upper and lower heating plates and pressurizing and heating (vulcanizing) the upper and lower heating plates, the embedded joint member 15 formed integrally with the members can be obtained. In such an embedded joint member 15 of the bridge girder, the embedded joint member 15 is connected between the connecting members 18 and 18 by the sliding layer 16 provided on the embedded joint member 15 and the sliding layer 20 of the bridge body slab surface. It becomes possible to slide without being restrained by.

Japanese Patent Laid-Open No. 2011-17152 Japanese Patent Laid-Open No. 10-298907

Since the conventional technique has the above-described configuration, the following problems existed.
That is, according to the first example, the embedded joint 1 placed and fixed on the upper surface of the floor slab is divided, and the blocks 1a to 1e are separated from each other by the bolt 2 and the connecting box removing portion 5. It is the structure connected by screwing in the nut 4 with which it was equipped. Therefore, the number of man-hours for managing the connecting parts such as the bolts 2 is increased, and the bolts 2 are embedded in the respective blocks. In addition, the above-described blocks 1a to 1e are thick, and the weight of the blocks is increased accordingly, resulting in inferior durability of the floor slab. Further, the number of man-hours for tightening the nut 4 to be screwed into the bolt 2, the man-hour for drilling the connecting box removing portion 5, the man-hour for injecting the resin into the connecting box removing portion 5, etc. increase, and the repair work period is delayed. There was a problem.

Further, according to the second example, the embedded joint member 15 is constituted by a single member and the expansion and contraction action of the embedded joint member 15 is absorbed by the left and right connecting members 18 and 18. Therefore, the buried joint member 15 has a large thickness and is large in size. When the site construction is performed, the construction work is difficult unless a special large crane is used. The connecting members 18 and 18 are prone to fatigue deterioration, the partial repair of the expansion / contraction device is impossible, and the construction cost is increased.

The block type buried joint expansion / contraction device for bridges according to the present invention is composed of a combination of a plurality of block type buried joints with a thin thickness of the buried joint, manufactured at a factory other than the site, and transported to the site, Another object of the present invention is to provide a bridge type buried joint expansion / contraction device for a bridge that can be easily assembled and can be easily installed and re-repaired.
The configuration and means of the present invention will be described below.

According to the invention described in claim 1, comprising a Joint Gap S and on the other hand, in the bridge having a buried joint for mounting and fixing through the sliding loading plate over preparative on the other RC slab, The embedded joint is a block type embedded joint composed of at least three , and the left and right block type embedded joints are fixed with anchor bolts fixed to the RC floor slab, and the back surface of the block type embedded joint A groove having a predetermined depth, width, and length is formed in the groove, an adjustment fitting is disposed in the groove, and a bolted expansion / contraction adjustment insert fixed to the block-type embedded joint is interposed in the elongated hole of the adjustment fitting. It is not characterized and Turkey to allow the movement of said block-type buried joints.

According to the invention described in claim 2, whereas the thickness h ₃ of the block-type buried joint on the invention of claim 1, the other RC slab recess depth h ₁ and is h _{3 <h 1} It is characterized by the relationship of inequality.

Since the expansion / contraction apparatus for installing in the pavement height according to the present invention has the above-described configuration and operation, the following effects can be obtained.

According to the invention described in claim 1, comprising a Joint Gap S and on the other hand, in the bridge having a buried joint for mounting and fixing through the sliding loading plate over preparative on the other RC slab, The embedded joint is a block type embedded joint composed of at least three , and the left and right block type embedded joints are fixed with anchor bolts fixed to the RC floor slab, and the back surface of the block type embedded joint A groove having a predetermined depth, width, and length is formed in the groove, an adjustment fitting is disposed in the groove, and a bolted expansion / contraction adjustment insert fixed to the block-type embedded joint is interposed in the elongated hole of the adjustment fitting. is allowed to provide a bridge block type buried joint extension device characterized by the Turkey to allow the movement of said block-type buried joints.
Because of this configuration, instead of removing connecting parts such as bolts as in the prior art, adjustment brackets are used to prevent cracks in the block-type embedded joint and increase durability, and the block-type embedded This has the effect of facilitating the transfer of the joint to the site and greatly reducing the number of work steps and completing the repair work or new construction work in a short period of time.

According to the second aspect of the present invention, the thickness h ₃ of the block-type embedded joint and the recess depth h ₁ of the other RC floor slab have an inequality relationship of h ₃ <h _1. A bridge type buried joint expansion / contraction device for a bridge according to claim 1, characterized in that it is characterized in that:
Since it is such a configuration, the thickness of the block-type embedded joint is set thin, so that in addition to the effect of the claims, the load on the RC floor slab itself can be reduced and the lifetime of the entire bridge can be set longer. effective.

It is a vertical sectional view showing an embodiment of a bridge type buried joint expansion / contraction device for a bridge according to the present invention. FIG. 2 is an enlarged vertical cross-sectional view showing a portion in the P1 range of FIG. 1 where a bolted expansion / contraction adjustment insert is fixed and arranged. FIG. 3 is a plan view of a block-type embedded joint that is cut along the direction of the arrow BB in FIG. 2. 3 shows a block-type embedded joint, in which (a) is a cross-sectional view in the direction of the arrow CC in FIG. 3, and (b) is a cross-sectional view in the direction of the arrow DD in FIG. FIG. 3 is a rear view of a block-type embedded joint that is cut in the direction of the arrow EE in FIG. 2. FIG. 1 shows an adjustment fitting of a bridge type embedded joint expansion / contraction device for a bridge according to the present invention, in which (a) is a sectional view in the direction of the arrow FF in FIG. 5 and (b) is an arrow GG in FIG. It is sectional drawing of a direction. There is shown a bottom view of the adjustment bracket bridges block type buried joint telescopic device according to the present invention, (a) is an enlarged view of the arrow P ₂ portion of FIG. 5, (b) the arrow in FIG. 5 it is an enlarged view of a P ₃ moiety. It is the plane top view which shows the 1st example in a prior art, Comprising: The state before constructing an expansion-contraction apparatus, Comprising: It is the partially broken plan view. 1 is a plan view showing a first example in the prior art, showing a state after completion of construction of an expansion / contraction device, and partially broken. FIG. It is a vertical sectional view showing a second example in the prior art.

An embodiment of a bridge type buried joint expansion / contraction device for a bridge according to the present invention will be described in detail with reference to FIGS. 1 to 7A and 7B. FIG. 1 shows an example of a vertical sectional view of a bridge such as a steel bridge or a concrete bridge (RC bridge) applied to the present invention. If this is demonstrated, 21 is the RC floor slab mounted and fixed on the upper part of a bridge girder (not shown). An upper surface portion of the RC floor slab 21 is rolled to an appropriate depth by a turning tool, a cutting tool or the like, and a recess 22 is set. The depth h ₁ of the recess 22 is about 40 (mm). Then, the resin mortar 22 a is filled in the recess 22. The turning range of the RC floor slab 21, that is, the direction orthogonal to the direction H orthogonal to the roadway shown in FIG. 3 is divided into a plurality of parts, that is, as shown in FIG. The block-type embedded joints 23A to 23E are placed on the entire roadway by dividing the number 23 into a plurality or a large number, for example, five.

The RC floor slab 21 is composed of one RC floor slab 21A and 21B on the other side, while the other RC floor slab 21A and 21B is a free space S, for example, set to about 75 (mm). the joint Gap top center to a thickness of h ₃ of S is 30 (mm) about the relatively thin shape of the block embedded joint 23C mounted and fixed. Widthwise center line L ₁ of the central block-type buried joint 23C is placed and fixed so as to match the center position of the Joint Gap S as shown in FIG. A back-up material 24 made of urethane or the like is interposed in the gap S. And the base end parts 27b and 27b of the anchor bolts 27 and 27 are driven and embedded in the other RC floor slabs 21A and 21B.

3 and FIG. 4 (a) (b) to the free block type buried joint 23A as seen from between the left and right mutual 23E sets the gap _{h 2,} for example, of about 10 (mm). And filling the joint material 25 in the gap h _2. The joint material 25 is made of, for example, a low resilience EPDM rubber sponge or other elastic member.

In FIG. 1, reference numeral 26 denotes an anchor bolt fixing hole, which interposes anchor bolts 27, 27 tip portions 27 a, 27 a embedded in the RC floor slab 21, and fills the aforementioned recess 22 of the RC floor slab 21 during construction. The resin mortar 22a thus filled is simultaneously filled in the anchor bolt fixing hole 26, and the anchor bolts 27, 27 are connected to the left-end block-type embedded joint 23A and the right-end block-type embedded joint 23E as well as the other RC floor slab 21A, Fix to 21B. In the figure, reference numeral 28 denotes a pavement member such as asphalt pavement, which is applied to the upper surface of the buried joint 23, that is, the block type buried joints 23A to 23E. A sliding plate 29 is laid on the upper surface of the resin mortar 22a directly on the upper surface of the recess 22 of the RC floor slab 21 or as shown in FIG.

The sliding plate 29 has a function of smoothly moving the central block-type embedded joint 23C and the left and right block-type embedded joints 23B, 23D to the left and right in response to expansion and contraction / expansion of the bridge due to changes in the outside air temperature. . The sliding plate 29 of the set area width length _{W 1} is the block-type buried joint 23A to be narrower than the full width length _{W 2} of 23E e.g. block-type buried joint 23B, the width length _{W 3} of the three-block embedded joints 23C and 23D The object of the present invention can be achieved even if the length is set.

It said block-type buried joint 23A to the insert 2 rows bolted telescopic adjustment of from block type buried joint 23A at the direction H with a predetermined width dimension H ₁ in the length direction of 23E perpendicular to the roadway to 23E 30 · Is provided. As shown in FIG. 3, for example, the block type embedded joints 23A, 23B, 23D, and 23E have two upper and lower bolts, and the center block type embedded joint 23C has left and right upper and lower positions. Two or four are set.

Said block-type buried joint 23A to the length direction of the predetermined width dimension H ₁ the rear surface as shown in FIG. 5 (rear) 23a to and width length S ₁ and the length has a depth H ₂ to 23e of 23E L ₂ groove 31 is set. In this groove 31, a thin plate-shaped adjustment fitting 32 is set as shown in FIG. 5, which is slightly narrower than the width S 1 of the groove 31 and whose thickness is smaller than the depth H _{2 and} is substantially rectangular. The adjustment metal fittings 32 are arranged at the horizontal position in the center in the width direction on the left and right as shown in FIGS. 6 and 7, and each of the insertion holes 33a through which the three bolted expansion / contraction adjustment inserts 30 are inserted. Thru 33c and 33d thru 33f are perforated. Then, the insertion hole 33a and 33f are Maen'ana, insertion holes 33b, 33e are elongated holes the Oyobi insertion hole 33c of a width length _{H 3} in the horizontal direction, 33d are through holes 33b, still wider than 33e length _{H 4} Each of the long holes is drilled. That is, the relationship of H ₄ > H ₃ is satisfied. The block-type embedded joint 23A and the block-type embedded joint 23E are each firmly fastened and fixed to the adjustment fitting 32 by a bolted expansion / contraction adjustment insert 30.

Next, the operation of the bridge type buried joint expansion / contraction device for bridge according to the present invention will be described.
As the bridge expands and contracts due to changes in the outside air temperature, the leftmost block-type embedded joint 23A and the rightmost block-type embedded joint 23E connected to the anchor bolts 27, 27 move the sliding plate 29 rightward or leftward. Move up. Thus, the adjustment fittings 32... Connected to the block type embedded joints 23A and 23E move in the right direction or the left direction.

In accordance with this, the adjacent block type embedded joints 23B and 23D and the central block type embedded joint 23C are moved while compressing or expanding the joint material 25. At this time, the insertion holes 33b, 33c and 33d, 33e, which are long holes perforated in the adjustment fittings 32,... Serve as movement guides, and each of the bolted expansion / contraction adjustment inserts 30 ... is a block type embedded joint 23B. , 23D and the block-type embedded joint 23C have a role / function as a fulcrum for moving.

Next, an embodiment of a bridge type buried joint expansion / contraction device for bridges according to the present invention will be described.
In the description of the above-mentioned embodiment, the embedded joint 23 is located at the intermediate position between the left and right end block type embedded joints 23A and 23E and the central block type embedded joint 23C. However, the present invention is not limited to this, and the present invention can be realized even if the left block type embedded joint 23B and the right block type embedded joint 23D are omitted. In addition, the left block type embedded joint 23B and the right block type embedded joint 23D are configured by a single block type embedded joint. However, depending on the type of bridge and the design specifications, a plurality or a plurality of these may be set. Also good.

Next, a construction method as an embodiment of the bridge type buried joint expansion / contraction device for a bridge according to the present invention will be described.
First, the existing pavement member 28 is removed. That is, after marking the cutting position on the existing pavement member 28, it is cut with a cutting tool such as a concrete cutter. Then, the existing pavement member 28 is removed using a scissors tool such as a chipper. Next, after marking the cutting position on the RC floor slab 21, it is cut with a cutting tool of a concrete cutter. The cutting depth is, for example, about 30 (mm) so as not to damage the internal rebar of the RC floor slab 21. Subsequently, the RC floor slab 21 is rolled using a breaker, chipper, etc., and the existing expansion joint is removed. The removed concrete pieces and expansion joints of the RC floor slab 21 are transported to a predetermined processing facility or processing place by a transport vehicle. After completion of the turning operation, the dust is sufficiently cleaned with a vacuum cleaner or a blower, and the concrete surface of the RC floor slab 21 is confirmed to be free from floating due to concrete fragments. If any abnormalities are found, remove concrete fragments from the floating parts. Next, when the bridge is temporarily restored, a curing sheet or the like is covered on the scraped portion, and an asphalt mixture, that is, an asphalt mixture, is spread on the curing sheet with a shovel or the like. For example, the asphalt mixture and the composite material are rolled by a 1-ton roller, a plate compactor, or the like to finish the temporary paving member 28 to a predetermined height.

Next, using a chipper or the like, the pavement member 28 temporarily restored on the previous day, the pavement member 28 on the RC floor slab 21 side, and the abutment side are removed to form a cross section. Next, a hole is drilled by a hammer drill or the like at a predetermined position after removing the existing expansion / contraction device, and a drive-in type anchor bolt 27. Next, a resin mortar 22a is spread and leveled in order to finish the surface of the RC floor slab 21 flat. In order to prevent the resin mortar 22a from flowing into the gap S portion of the RC floor slab 21, a urethane backup material 24 is installed in advance. Next, in order to make the height of the top end of the RC floor slab 21 and the top end of the block-type embedded joints 23A to 23E, the equilateral angle steel on the upper surface is temporarily attached.

Next, the block type embedded joints 23A to 23E to which the bolt-type expansion adjustment inserts 30... And the adjustment metal fittings 32 are attached are suspended by a mobile crane and conveyed to the construction position of the RC floor slab 21. The center of the width of 21 free spaces S and the center of the block type embedded joints 23A to 23E are made to coincide with each other.
Next, the resin mortar 22a is filled in the anchor bolt fixing holes 26,... And the back filling portions of the block type embedded joints 23A to 23E. After the resin mortar 22a is hardened, the equilateral angle steel is removed and the embedded nut is filled with a caulking material or the like. After filling the backfill material and the resin mortar 22a, it is cured for a predetermined time.

Next, a crack dispersion sheet is laid on the upper surfaces of the block-type embedded joints 23A to 23E and the upper surface of the RC floor slab 21. The crack dispersion sheet is coated with a bitumen primer, and the coated surface is touched with a finger and dried to such an extent that stickiness is eliminated, and then adhered to the installation range. Next, the asphalt mixture is spread on the crack-dispersed sheet with a shovel or the like and a load compartment door seal, and the asphalt mixture is rolled by a roller, a plate compactor or the like to finish to a predetermined height. Further, an asphalt paving member 28 is paved. That is, the temperature of the base layer is confirmed, the emulsion is thinly coated, the asphalt mixture is spread with a shovel or the like, and the asphalt mixture is rolled by a 1 ton roller, a plate compactor or the like, and finished to a predetermined height.

The present invention is not limited to the repair work of the existing bridge extension device, but can also be applied to the construction of a new bridge extension device. In that case, the turning work process of the RC floor slab 21 and the removal work process of the existing telescopic device are not required.

The block type buried joint expansion / contraction device for bridges according to the present invention is a block type buried joint expansion / contraction device for bridges in steel bridges and RC bridges applied to road bridge structures such as rivers, canyons, elevated roads and various roads. It is. And it is a block type buried joint expansion / contraction device for bridges applied to the existing or new field.

21 RC floor slab 21A One RC floor slab 21B The other RC floor slab 22 Recess
22a Resin mortar 23 Embedded joint 23A Block type embedded joint 23B Block type embedded joint 23C Block type embedded joint 23D Block type embedded joint 23E Block type embedded joint 23a Back side of block type embedded joint 23b Back side of block type embedded joint 23c Block type embedded joint Back surface 23d Back surface 23e of block type embedded joint Back surface 24 of block type embedded joint 24 Backup material 25 Joint material
26 Anchor bolt fixing hole 27 Anchor bolt 27a Anchor bolt distal end portion 27b Anchor bolt proximal end portion 28 Pavement member 29 Sliding plate 30 Bolt expansion / contraction adjustment insert 31 Groove 32 Adjustment fitting 33a Insertion hole (round hole)
33b insertion hole (long hole width length _{H 3)}
33c insertion hole (long hole width length _{H 4)}
33d insertion hole (long hole width length _{H 4)}
33e insertion hole (long hole width length _{H 3)}
33f Insertion hole (round hole)
H Direction perpendicular to the roadway H ₁ Predetermined width in the direction perpendicular to the roadway H ₂ Groove depth h ₁ Depth h ₂ Clearance h ₃ Block type embedded joint thickness L ₁ Width direction center line L ₂ groove length S free space S ₁ groove width W ₁ sliding plate setting area width W _{2 full} width W of block type embedded joints 23A to 23E _three width lengths of ₃ block type embedded joints 23B, 23C and 23D

Claims (2)

Has a Joint Gap S and on the other hand, in the bridge having a buried joint for mounting and fixing through the sliding loading plate over preparative on the other RC slab, constituted the embedded joint at least at three It is a block type embedded joint. The block type embedded joints at the left and right ends of the embedded joint are fixed with anchor bolts fixed to the RC floor slab, and a predetermined depth, width and length are formed on the back surface of the block type embedded joint. A groove is formed, an adjustment fitting is disposed in the groove, and an extension adjusting insert with a bolt fixed to the block-type embedded joint is interposed in a long hole of the adjustment bracket to allow the movement of the block-type embedded joint. bridge block type buried joint extension device which is characterized in that. 2. The bridge structure according to claim 1, wherein the thickness h ₃ of the block-type embedded joint and the recess depth h ₁ of the other RC floor slab have an inequality relationship of h ₃ <h ₁ . Block type embedded joint expansion and contraction device.

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