JP6890523B2 - Joint structure and joining method - Google Patents

Description

The present invention relates to a joint structure constructed by joining a plurality of concrete precast decks, and a joining method.

Conventionally, various joint structure and joining method in which a plurality of concrete precast decks are joined are known. Patent Document 1 describes a precast concrete deck and a joint structure thereof. This joint structure includes a plurality of precast concrete decks arranged side by side along the bridge axis direction, a plurality of joint reinforcing bars protruding from the end faces of each of the plurality of precast concrete decks to the filling portion, and filling the filling portion. It is equipped with concrete to be used.

Protrusions extend from the lower part of the pair of precast concrete decks, and the protrusions of the pair of precast concrete decks face each other to form a clogging portion above each protrusion. In this joint structure, the precast concrete decks are arranged by abutting the protruding parts protruding from the pair of precast concrete decks against each other, and concrete is poured into the stuffed parts to form a pair of precast concrete decks. Are integrated.

Japanese Unexamined Patent Publication No. 2007-231569

The joining work of precast concrete decks may be required to be carried out promptly. However, as described above, since it is necessary to place the joint reinforcing bar in the padding portion between the two precast concretes and to pour concrete in the padding portion to wait for hardening, the concrete precast deck slab The current situation is that construction cannot be carried out promptly.

Further, in the above-mentioned joint structure, concrete is cast after the protruding portion protruding from the lower part of one precast concrete deck is abutted against the protruding portion of the other precast concrete deck. Therefore, there is a concern that the protrusions may be cracked or chipped when they are butted against each other. Therefore, there is room for improvement in the strength of the joint portion of the concrete precast deck.

An object of the present invention is to provide a joint portion structure and a joining method capable of promptly performing construction and increasing the strength of the joint portion.

The joint structure according to the present invention is a first concrete precast extending in the bridge axis direction, the bridge axis perpendicular direction orthogonal to the bridge axis direction, and the height direction orthogonal to both the bridge axis direction and the bridge axis orthogonal direction. The deck structure is a joint structure in which the deck and the second concrete precast deck are joined to each other, and the first concrete precast deck and the second concrete precast deck are both in the direction perpendicular to the bridge axis and in height. It has a plurality of joint reinforcing bars extending in the direction of the bridge axis from the end face extending in the direction, and a recess extending in the direction of the bridge axis from the upper end of the end face, and has an end face of the first concrete precast deck and a second concrete precast floor. It is arranged above the joint space formed between the end face of the slab and has a lining plate installed in the recess of the first concrete precast deck and the recess of the second concrete precast deck. The lining plate comprises a support portion extending downward in the joint space, and the lining plate is installed so as to be continuous with the upper surface of the first concrete precast deck and the upper surface of the second concrete precast deck.

In the joint structure described above, both the first concrete precast deck and the second concrete precast deck have recesses extending in the bridge axis direction from the upper end of the end face, and each recess is located above the joint space. A lining plate is provided. Since the lining plate is placed on the upper surface of the recess of the first concrete precast deck and the upper surface of the recess of the second concrete precast deck, the lining plate is arranged to easily close the joint space from above. Can be done. Further, the lining plate is installed so as to be continuous with the upper surface of the first concrete precast deck and the upper surface of the second concrete precast deck. Therefore, since the upper surface of each concrete precast deck can be aligned by installing the lining plate, the vehicle or the like can be passed through the upper surface of each concrete precast deck and the upper surface of the lining plate. Therefore, the construction of each concrete precast deck can be carried out promptly. Further, a support portion extending downward in the joint space protrudes from the lining plate, and this support portion is embedded in the filler in the joint space. Therefore, by supporting the support portion of the lining plate in the joint space, the strength of the joint portion between the first concrete precast deck and the second concrete precast deck can be increased.

Further, the lining plate may have a positioning pin that is inserted from above into a hole formed on the upper surface of the recess. In this case, by inserting the alignment pin into the hole formed on the upper surface of the recess, the lining plate can be easily aligned with the recess. Therefore, the installation work of the lining plate can be easily performed.

Further, the hole portion may have an oval shape extending in the direction of the bridge axis. In this case, the pin can be easily inserted into the hole even when the position of the pin with respect to the hole is slightly displaced in the direction of the bridge axis. Therefore, it is possible to more easily install the lining plate in the recess.

Further, the lining plate may have an injection hole through which the filler is injected while penetrating in the height direction. In this case, since the filler can be injected into the joint space from the injection hole, the joining work of each concrete precast deck can be performed more efficiently.

Further, the lining plate may have an anchor bar extending downward in the joint space. In this case, by embedding the anchor bar in the filler in the joint space, the strength of the joint portion between the first concrete precast deck and the second concrete precast deck can be further increased.

Further, the support portion may be supported by a formwork that covers the joint space from below. In this case, the formwork used when placing the filler can be effectively used as a member for supporting the support portion.

Further, at least one of the end face of the first concrete precast deck and the end face of the second concrete precast deck projects a bottom slab extending downward from the joint space, and the support portion is supported by the bottom slab. You may. In this case, the bottom slab of the concrete precast deck that forms the joint space can be effectively used as a portion that supports the support portion. Further, since the concrete precast floor slab is provided with the bottom slab, the formwork can be eliminated when the filler is injected into the joint space, so that the workability can be improved.

Further, the above-mentioned joint structure may include a rust preventive member that covers the tip of the support. In this case, even if the tip of the support portion is exposed to the outside, the rust preventive member can suppress the occurrence of rust at the tip of the support portion.

The joining method according to the present invention is a first concrete precast floor extending in the bridge axis direction, the bridge axis perpendicular direction orthogonal to the bridge axis direction, and the height direction orthogonal to both the bridge axis direction and the bridge axis orthogonal direction. A joining method in which a slab and a second concrete precast deck are joined to each other. Both the first concrete precast deck and the second concrete precast deck extend in the direction perpendicular to the bridge axis and in the height direction. a plurality of reinforcing bars for fitting projecting bridge axis direction from the end face has a recess which extends in the bridge axis direction from the upper end of the end surface, the bottom plate of the bottom plate and the second concrete precast slab of the first concrete precast slab The process of installing the first concrete precast deck and the second concrete precast deck so as to match with each other, and the end face of the first concrete precast deck and the end face of the second concrete precast deck. In the process of installing a lining plate having a support portion extending downward in the joint space formed between them in the recesses of the first concrete precast deck and the recesses of the second concrete precast deck, and in the joint space. It includes a step of filling a filler.

In the joining method described above, a lining plate located above the joint space is installed in the recess of the first concrete precast deck and the recess of the second concrete precast deck. At this time, since the lining plate is placed on the upper surface of the recess of the first concrete precast deck and the upper surface of the recess of the second concrete precast deck, the lining plate is arranged to facilitate the joint space from above. Can be closed to. Therefore, the construction of the first concrete precast deck and the second concrete precast deck can be carried out promptly. Further, a support portion extending downward in the joint space protrudes from the lining plate, and the support portion is embedded in the filler in the joint space. Therefore, by supporting the support portion of the lining plate in the joint space, the strength of the joint portion between the first concrete precast deck and the second concrete precast deck can be increased.

Further, the lining plate has a positioning pin to be inserted from above into a hole formed on the upper surface of the recess, and in the process of installing the lining plate in the recess, the pin is inserted into the hole. The height of the upper surface of the lining plate may be matched with the height of the upper surface of the first concrete precast deck and the upper surface of the second concrete precast deck. In this case, by inserting the alignment pin into the hole formed on the upper surface of the recess, the lining plate can be easily aligned with the recess. Therefore, the installation work of the lining plate can be easily performed.

According to the present invention, the construction can be carried out quickly and the strength of the joint portion can be increased.

It is a top view which shows the joint part structure which concerns on 1st Embodiment. It is a vertical cross-sectional view when the joint part structure of FIG. 1 is cut by a plane extending in the vertical direction. It is a side view which shows the lining plate of the joint part structure of FIG. FIG. 3 is a perspective view showing a pin of the lining plate of FIG. 3 and a hole formed on the upper surface of the recess. It is a perspective view which shows the lining plate of FIG. It is a vertical cross-sectional view which shows the tip of the support part of the lining plate of FIG. 3 and the rust preventive member. It is a vertical cross-sectional view when the joint part structure which concerns on 2nd Embodiment is cut by the plane extending in the vertical direction. It is a vertical cross-sectional view when the joint part structure which concerns on 3rd Embodiment is cut by the plane extending in the vertical direction.

Hereinafter, embodiments of a joint structure and a joining method according to the present invention will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and duplicate description will be omitted as appropriate. In addition, the drawings are partially exaggerated for ease of understanding, and the dimensions, angles, etc. are not limited to those described in the drawings.

(First Embodiment)
FIG. 1 shows a first concrete precast deck 10 (concrete precast deck), another second concrete precast deck 20 different from the first concrete precast deck 10 (concrete precast deck 10 on the other side), and It is a top view which shows the joint part structure 1 provided with the lining plate 30. The joint structure 1 is a connecting structure in which the first concrete precast deck 10 and the second concrete precast deck 20 are connected via a lining plate 30.

For example, the first concrete precast deck 10 and the second concrete precast deck 20 are precast decks forming a road bridge. In the road bridge, a plurality of precast decks are arranged along the bridge axial direction D1, and a part of the concrete precast decks of the plurality of precast decks is used as a first concrete precast deck 10 and a second concrete. The precast deck is 20.

The first concrete precast deck 10 and the second concrete precast deck 20 are manufactured in advance at the factory, and the first concrete precast deck 10, the second concrete precast deck 20, and the lining board 30 are manufactured in advance. Is transported to the site. The direction in which the first concrete precast deck 10, the lining plate 30, and the second concrete precast deck 20 are connected and the bridge axial direction D1 coincide with each other.

As shown in FIGS. 1 and 2, the lining plate 30 provides a joint space S (joint space) formed between the first concrete precast deck 10 and the second concrete precast deck 20 from above. It is a covering member and has an injection hole 33 for filling the joint space S with the filler 40. A plurality of injection holes 33 are arranged side by side along the bridge axis direction D1 and the bridge axis perpendicular direction D2 so as to form a grid pattern, for example.

The first concrete precast deck 10 includes a rectangular parallelepiped precast block 11 and a plurality of joint reinforcing bars 12 extending in the bridge axis direction D1. The second concrete precast deck 20 includes a precast block 21 and a joint reinforcing bar 22 similar to the precast block 11 and the joint reinforcing bar 12. The precast block 11 and the precast block 21 form, for example, a road surface portion extending in the bridge axis direction D1 and the bridge axis perpendicular direction D2. That is, the upper surface 11a of the precast block 11 and the upper surface 21a of the precast block 21 both form a road surface.

The precast block 11 and the precast block 21 have a thickness in the height direction D3. The height direction D3 is a direction orthogonal to both the bridge axis direction D1 and the bridge axis perpendicular direction D2, and the bridge axis direction D1 and the bridge axis perpendicular direction D2 are also orthogonal to each other. The thickness of the precast block 11 and the precast block 21 in the height direction D3 is, for example, 16 cm or more and 30 cm or less. The length of the joint space S in the bridge axis direction D1 is also 16 cm or more and 30 cm or less. However, these values can be changed as appropriate.

Since the precast block 11 and the precast block 21 form, for example, a road bridge, they receive a load from a vehicle or the like. The joint structure 1 is constructed by connecting the end surface 11b located at one end of the precast block 11 in the bridge axis direction D1 and the end surface 21b located at one end of the precast block 21 in the bridge axis direction D1. The end surface 11b is a surface facing the end surface 21b in the bridge axis direction D1. The end face 11b and the end face 21b are, for example, both flat surfaces and extend in the direction perpendicular to the bridge axis D2 and the height direction D3.

The joint reinforcing bar 12 is embedded in the precast block 11 and protrudes from the end face 11b in a rod shape. The joint reinforcing bar 12 extends linearly toward the second concrete precast deck 20. A diameter-expanding member 13 that expands the diameter from each joint reinforcing bar 12 is attached to the tip of each joint reinforcing bar 12. A plurality of joint reinforcing bars 12 are arranged along the bridge axis perpendicular direction D2, and a plurality of each (for example, two) are arranged along the height direction D3.

The bottom slab 17 projects from the end surface 11b. The bottom slab 17 projects in the bridge axis direction D1 from the lower side of the end surface 11b, and has a plate shape extending in the bridge axis direction D1 and the bridge axis perpendicular direction D2. The bottom slab 17 is provided over the entire bridge axis perpendicular direction D2 so as to cover about half of the joint space S from below. For example, the protruding length of the bottom slab 17 is shorter than the protruding length of the joint reinforcing bar 12.

The joint reinforcing bar 22 of the second concrete precast deck 20 projects from the end face 21b toward the first concrete precast deck 10. A diameter-expanding member 13 is attached to the joint reinforcing bar 22 in the same manner as the joint reinforcing bar 12. The arrangement, configuration, and action of the joint reinforcing bar 22 are the same as, for example, the arrangement, configuration, and action of the joint reinforcing bar 12. The joint reinforcing bars 12 and the joint reinforcing bars 22 are arranged, for example, in a staggered pattern between the end faces 11b and the end faces 21b. Further, the bottom slab 27 protrudes from the end surface 21b. The shape of the bottom slab 27 is, for example, the same as the shape of the bottom slab 17, and the bottom slab 27 projects from the lower side of the end face 21b toward the bottom slab 17. The bottom slab 27 is provided over the entire bridge axis perpendicular direction D2 so as to cover the other half of the joint space S not covered by the bottom slab 17 from below.

Recesses 11c and 21c on which the lining plate 30 is arranged are formed on the upper surface 11a of the precast block 11 and the upper surface 21a of the precast block 21, respectively. Both the recess 11c and the recess 21c extend in the bridge axis direction D1 from the upper ends of the end faces 11b and 21b. The depths of the recesses 11c and 21c correspond to the thickness of the lining plate 30. Further, the area of the rectangular region including the recesses 11c and 21c and the joint space S in the plan view is the same as the area of the lining plate 30 in the plan view.

Therefore, by placing the lining plate 30 in the recess 11c of the precast block 11 and the recess 21c of the precast block 21 in a state where the joint space S is formed between the end face 11b and the end face 21b, the upper surface 30a of the lining plate 30 is placed. Is continuous with the upper surface 11a of the first concrete precast floor slab 10 and the upper surface 21a of the second concrete precast floor slab 20. That is, the lining plate 30 just enters the rectangular region including the recess 11c, the joint space S, and the recess 21c in a plan view, and the upper surfaces 11a and 21a and the upper surface 30a of the lining plate 30 are located on the same plane. It is installed to do.

The lining plate 30 faces the stepped portions 11f and 21f between the upper surfaces 11a and 21a and the recesses 11c and 21c. That is, the side surfaces 30c and 30d of the lining plate 30 facing the bridge axis direction D1 face the stepped portions 11f and 21f, respectively. Further, in the bridge axis direction D1, the positions of the stepped portions 11f and 21f and the side surfaces 30c and 30d and the positions of the end faces 11b and 21b are deviated from each other. Therefore, it is possible to prevent water or the like from entering the end faces 11b and 21b from above. That is, since the water passage to the end faces 11b and 21b can be lengthened, the durability of the joint portion as a whole can be improved.

The lining plate 30 is arranged in the joint space S located between the end face 11b and the end face 21b. The lining plate 30 may be made of, for example, Ultra high strength fiber reinforced concrete (UFC), and in this case, the strength of the joint structure 1 can be further increased. However, the material of the lining plate 30 can be changed as appropriate. The lining plate 30 extends long in the joint space S in the direction D2 perpendicular to the bridge axis, and the shape of the lining plate 30 in a plan view is a rectangular shape extending long in the direction D2 perpendicular to the bridge axis. The lining plate 30 includes a positioning pin 31, a pair of anchor bars 32 provided in the bridge axial direction D1, and a support portion 35 extending downward in the joint space S.

As shown in FIGS. 2, 3 and 4, the pins 31 are provided in pairs in the bridge axis direction D1. Further, holes 11e and 21e are formed on the upper surface of the recess 11c and the upper surface of the recess 21c, respectively. Both the holes 11e and 21e have an oval shape extending in the bridge axis direction D1. Therefore, even if the position of the pin 31 in the bridge axis direction D1 with respect to the holes 11e and 21e is slightly deviated, the pin 31 can be smoothly inserted into the holes 11e and 21e.

The holes 11e and 21e and the pair of pins 31 arranged in the bridge axis direction D1 are arranged at positions symmetrical with respect to the center of the bridge axis direction D1 of the joint space S, for example. The holes 11e and 21e are, for example, inserts embedded in the precast blocks 11 and 21, and pins 31 are press-fitted into the holes 11e and 21e, respectively. The holes 11e, 21e and the pin 31 function as positioning portions for positioning the lining plate 30 with respect to the precast block 11 and the precast block 21. The positioning portion may have a shape different from that of the holes 11e and 21e and the pin 31, such as concave and convex portions or corrugated uneven portions.

Anchor muscles 32 are provided in pairs in the bridge axis direction D1. The pair of anchor muscles 32 are arranged, for example, at positions symmetrical with respect to the center of the joint space S in the bridge axis direction D1. Each anchor bar 32 extends downward from the lower surface 30b of the lining plate 30, and a folded portion 32a is provided at the tip of each anchor bar 32. Each folded-back portion 32a is bent from the lower part of the anchor bar 32 toward the center side of the lining plate 30, and is bent upward in a U-shape and folded back. Each anchor bar 32 is arranged in the joint space S and is embedded in the filler 40. The number and arrangement of the pins 31 and the anchor bars 32 provided on the lining plate 30 can be changed as appropriate. For example, a plurality of pins 31 are arranged along the bridge axis perpendicular direction D2 and the bridge axis perpendicular direction D2. A plurality of anchor muscles 32 are arranged along the line.

As shown in FIG. 5, the lining plate 30 includes a plurality of support portions 35 arranged along the bridge axis perpendicular direction D2. In FIG. 5, the pin 31 and the anchor muscle 32 are not shown for simplification. Each support portion 35 projects downward from the lower surface 30b of the lining plate 30 and has a rod shape. The protruding length of each support portion 35 is longer than the protruding length of each anchor muscle 32. For example, the lower end of each support portion 35 abuts on the bottom plates 17 and 27 described above. As a result, each support portion 35 is supported by the bottom plates 17 and 27. For example, the plurality of support portions 35 are provided at regular intervals along the bridge axis perpendicular direction D2, and the intervals of the plurality of support portions 35 are, for example, 50 cm or more and 200 cm or less. The number of support portions 35 provided on the lining plate 30 is, for example, 5 or more and 20 or less. These values can be changed as appropriate.

As shown in FIGS. 5 and 6, a rust preventive member 36 is provided at the tip of the support portion 35. The rust preventive member 36 is made of, for example, ceramic. In this case, there is an advantage that the strength of the tip of the support portion 35 can be increased and it is difficult to peel off. The material of the rust preventive member 36 may be other than ceramic, such as fiber reinforced plastic (FRP: Fiber Reinforced Plastics), stainless steel, or a metal subjected to rust preventive treatment by epoxy coating. The rust preventive member 36 has, for example, an enlarged diameter shape that increases in diameter toward the bottom. Since the rust preventive member 36 has an enlarged diameter shape in this way, it is possible to further increase the joint strength of the first concrete precast deck 10, the second concrete precast deck 20, and the lining plate 30. is there.

Next, a joining method for joining the first concrete precast deck 10 and the second concrete precast deck 20 will be described. First, a first concrete precast deck 10, a second concrete precast deck 20, and a lining board 30 are prepared (a first concrete precast deck, a second concrete precast deck, and a lining board are prepared. Process). Next, the first concrete precast floor slab 10, the second concrete precast floor slab 20, and the lining plate 30 are transported to the site. Then, the first concrete precast deck 10 and the second concrete precast deck 20 are installed by lifting and lowering.

At this time, as shown in FIG. 2, the end face 11b of the first concrete precast deck 10 and the end face 21b of the second concrete precast deck 20 are made to face each other, and the bottom slab 17 is made to face the bottom slab 27. Then, the bottom slab 17 and the bottom slab 27 are butted so that the joint reinforcing bars 12 of the first concrete precast deck 10 and the joint reinforcing bars 22 of the second concrete precast deck 20 are staggered.

After the bottom slab 17 and the bottom slab 27 are butted against each other, the lining plate 30 is installed on the upper surface of the recess 11c of the first concrete precast deck 10 and the upper surface of the recess 21c of the second concrete precast deck 20. At this time, the lining plate 30 is installed so that the pair of anchor bars 32 and the support portion 35 extend downward in the joint space S and the support portion 35 abuts on the bottom plates 17 and 27. Then, the pin 31 is inserted into the holes 11e and 21e. By installing the lining plate 30, the joint space S is closed from above (step of installing the lining plate).

After installing the lining plate 30, even if an embedding material that fills the gap is injected between the lining plate 30 and the precast blocks 11 and 21 (between the side surfaces 30c and 30d and the stepped portions 11f and 21f). Good. Further, the joint space S is filled with the filler 40 (step of filling the filler). The filler 40 is filled by filling the joint space S with the filler 40 from the injection hole 33 of the lining plate 30. After the filler 40 is filled as described above and the filler 40 is cured, the joint structure 1 is completed.

Next, the working effects of the joint structure 1 and the joining method according to the present embodiment will be described in detail. In the joint structure 1 and the joining method according to the present embodiment, the first concrete precast deck 10 and the second concrete precast deck 20 both have a recess 11c extending from the upper ends of the end faces 11b and 21b in the bridge axial direction D1. , 21c, and each recess 11c, 21c is provided with a lining plate 30 located above the joint space S. Since the lining plate 30 is placed on the upper surface of the recess 11c of the first concrete precast deck 10 and the upper surface of the recess 21c of the second concrete precast deck 20, the lining plate 30 is arranged to provide a joint space. S can be easily closed from above.

Further, the lining plate 30 is installed so as to be continuous with the upper surface 11a of the first concrete precast deck 10 and the upper surface 21a of the second concrete precast deck 20. Therefore, by installing the lining plate 30, the upper surfaces 11a and 21a of the concrete precast decks 10 and 20 can be aligned, so that the upper surfaces 11a and 21a of the concrete precast decks 10 and 20 and the upper surface of the lining plate 30 can be aligned. A vehicle or the like can be passed through 30a. Therefore, the construction of each concrete precast floor slab 10 and 20 can be carried out promptly.

Further, a support portion 35 extending downward in the joint space S protrudes from the lining plate 30, and the support portion 35 is embedded in the filler 40 in the joint space S. Therefore, by supporting the support portion 35 of the lining plate 30 in the joint space S, the strength of the joint portion between the first concrete precast deck 10 and the second concrete precast deck 20 can be increased.

Further, in the joint structure 1 and the joining method according to the present embodiment, the lining plate 30 has a positioning pin 31 inserted from above into the holes 11e and 21e formed on the upper surfaces of the recesses 11c and 21c. Have. Therefore, by inserting the alignment pin 31 into the holes 11e and 21e formed on the upper surfaces of the recesses 11c and 21c, the lining plate 30 can be easily aligned with the recesses 11c and 21c. Therefore, the installation work of the lining plate 30 can be easily performed.

Further, as shown in FIG. 4, the holes 11e and 21e have an oval shape extending in the bridge axis direction D1. Therefore, the pin 31 can be easily inserted into the holes 11e and 21e even when the positions of the pins 31 with respect to the holes 11e and 21e are slightly displaced in the bridge axis direction D1. Therefore, the lining plate 30 can be more easily installed in the recesses 11c and 21c.

Further, as shown in FIG. 1, the lining plate 30 has an injection hole 33 penetrating in the height direction D3 and into which the filler 40 is injected. Therefore, since the filler 40 can be injected into the joint space S from the injection hole 33, the joining work of the concrete precast floor slabs 10 and 20 can be performed more efficiently.

Further, as shown in FIG. 2, the lining plate 30 has an anchor bar 32 extending downward in the joint space S. Therefore, by embedding the anchor bar 32 in the filler 40 in the joint space S, the strength of the joint portion between the first concrete precast deck 10 and the second concrete precast deck 20 can be further increased.

Further, bottom slabs 17 and 27 extending downward from the joint space S project from the end face 11b of the first concrete precast deck 10 and the end face 21b of the second concrete precast deck 20, and the support portion 35 , Supported by bottom plates 17, 27. Therefore, the bottom slab 17 of the first concrete precast deck 10 and the bottom slab 27 of the second concrete precast deck 20 forming the joint space S can be effectively used as a portion for supporting the support portion 35. Further, since the first concrete precast deck 10 and the second concrete precast deck 20 are provided with the bottom slabs 17 and 27, the formwork can be eliminated when the filler 40 is injected into the joint space S. Therefore, workability can be improved.

Further, the joint portion structure 1 includes a rust preventive member 36 that covers the tip of the support portion 35. Therefore, even when the tip of the support portion 35 is exposed from the filler 40, the rust preventive member 36 can suppress the occurrence of rust at the tip of the support portion 35.

(Second Embodiment)
Next, the joint structure 41 and the joining method according to the second embodiment will be described with reference to FIG. 7. As shown in FIG. 7, the joint structure 41 is different from the first embodiment in that the formwork F is used at the time of construction and that the bottom plates 17 and 27 are not provided. Hereinafter, the description overlapping with the first embodiment will be omitted as appropriate.

In the joining method of the joint structure 41 according to the second embodiment, the form F is fixed at a position that closes the joint space S from below (step of fixing the form). Then, the lining plate 30 is arranged so that the pair of anchor bars 32 and the support portion 35 extend downward in the joint space S and the support portion 35 abuts on the formwork F, and the lining plate 30 is installed in the same manner as described above. Perform (the process of installing the lining plate). After that, the joint space S is filled with the filler 40, and after the filler 40 is cured, the formwork F is removed to complete the joint structure 41.

As described above, in the joint portion structure 41 and the joining method according to the second embodiment, the support portion 35 protrudes from the lining plate 30, and the support portion 35 is embedded in the filler 40 in the joint space S. Therefore, by supporting the support portion 35 of the lining plate 30 in the joint space S, the strength of the joint portion between the first concrete precast deck 10 and the second concrete precast deck 20 can be increased. , The same effect as that of the above-described embodiment can be obtained. Further, in the second embodiment, the support portion 35 is supported by the formwork F that covers the joint space S from below. Therefore, the formwork used when placing the filler 40 can be effectively used as a member for supporting the support portion 35.

(Third Embodiment)
Subsequently, the joint structure 51 according to the third embodiment will be described with reference to FIG. As shown in FIG. 8, the joint structure 51 includes stepped portions 61f and 71f of the first concrete precast deck 60 and the second concrete precast deck 70, and side surfaces of the lining plate 80 in the bridge axial direction D1. The shapes of 80c and 80d are different from those of the above-described embodiment.

In the first concrete precast deck 10 and the second concrete precast deck 20 of the first embodiment, the step portions 11f and 21f and the side surfaces 30c and 30d of the lining plate 30 both extend in the height direction D3. It was. However, in the first concrete precast deck 60 and the second concrete precast deck 70, the step portions 61f and 71f and the side surfaces 80c and 80d of the lining plate 80 are both inclined with respect to the height direction D3. There is. Specifically, the step portion 61f and the side surface 80c are inclined in a direction away from the end surface 61b of the precast block 61 toward the upper side. Further, the step portion 71f and the side surface 80d are inclined in a direction away from the end surface 71b of the precast block 71 toward the upper side.

As described above, in the joint structure 51 according to the third embodiment, the stepped portions 61f and 71f and the side surfaces 80c and 80d of the lining plate 80 are both inclined in the direction away from the end faces 61b and 71b. Therefore, since the lining plate 80 is easily placed in the recesses 61c and 71c of the precast blocks 61 and 71, the construction can be performed more easily.

Although each embodiment of the joint structure and the joining method according to the present invention has been described above, the present invention is not limited to each of the above-described embodiments, and the gist described in each claim is not changed. It may be deformed. That is, the configuration of each part of the joint part structure and the content and order of each step of the joining method can be changed as appropriate.

For example, in the above-described embodiment, the lining plate 30 in which a plurality of rod-shaped support portions 35 are provided has been described, but the shape, size, number, material, and arrangement mode of the support portions are not limited to the above-described embodiment. It can be changed as appropriate.

Further, in the above-described embodiment, as shown in FIG. 2, an example in which the first concrete precast floor slab 10 includes the bottom slab 17 and the second concrete precast floor slab 20 includes the bottom slab 27 has been described. However, only one of the first concrete precast deck 10 and the second concrete precast deck 20 may have a bottom slab. In this case, for example, the bottom slab protruding from one of the first concrete precast deck 10 and the second concrete precast deck 20 comes into contact with the end face of the other concrete precast deck. Further, the shape and size of the bottom slab can be changed as appropriate.

1,41,51 ... Joint structure, 10,60 ... First concrete precast deck (concrete precast deck), 11,21,61,71 ... Precast block, 11a, 21a ... Top surface, 11b, 21b, 61b , 71b ... End face, 11c, 21c, 61c, 71c ... Recess, 11e, 21e ... Hole, 11f, 21f, 61f, 71f ... Step, 12, 22 ... Joint reinforcing bar, 13 ... Diameter expansion member, 17, 27 ... bottom slab, 20, 70 ... second concrete precast floor slab (counterpart concrete precast floor board), 30, 80 ... lining board, 30a ... top surface, 30b ... bottom surface, 30c, 30d, 80c, 80d ... side surface, 31 ... Pin, 32 ... Anchor bar, 32a ... Folded part, 33 ... Injection hole, 35 ... Support part, 36 ... Anti-corrosion member, 40 ... Filling material, D1 ... Bridge axis direction, D2 ... Bridge axis perpendicular direction, D3 ... Height Direction, F ... Formwork, S ... Joint space.

Claims (10)

A first concrete precast deck and a second slab extending in the bridge axis direction, the bridge axis orthogonal direction orthogonal to the bridge axis direction, and the height direction orthogonal to both the bridge axis direction and the bridge axis orthogonal direction. It is a joint structure in which concrete precast decks are joined to each other.
The first concrete precast deck and the second concrete precast deck both have a plurality of joint reinforcing bars protruding in the bridge axis direction from end faces extending in the direction perpendicular to the bridge axis and in the height direction. It has a recess extending from the upper end of the end face in the direction of the bridge axis.
The first concrete precast deck is placed above the joint space formed between the end face of the first concrete precast deck and the end face of the second concrete precast deck, and the first concrete precast deck. It is provided with a recess and a lining plate installed in the recess of the second concrete precast deck.
The lining plate comprises a support that extends downward in the joint space.
The lining plate is installed so as to be continuous with the upper surface of the first concrete precast deck and the upper surface of the second concrete precast deck.
Joint structure. The lining plate has a positioning pin that is inserted from above into a hole formed in the upper surface of the recess.
The joint structure according to claim 1. The hole has an oval shape extending in the direction of the bridge axis.
The joint structure according to claim 2. The lining plate has an injection hole that penetrates in the height direction and is injected with a filler.
The joint structure according to any one of claims 1 to 3. The lining plate has anchor bars extending downward in the joint space.
The joint structure according to any one of claims 1 to 4. The support portion is supported by a formwork that covers the joint space from below.
The joint structure according to any one of claims 1 to 5. At least one of the end face of the first concrete precast deck and the end face of the second concrete precast deck projects a bottom slab extending downward from the joint space.
The support portion is supported by the bottom plate.
The joint structure according to any one of claims 1 to 5. A rust preventive member that covers the tip of the support portion is provided.
The joint structure according to any one of claims 1 to 7. A first concrete precast deck and a second slab extending in the bridge axis direction, the bridge axis orthogonal direction orthogonal to the bridge axis direction, and the height direction orthogonal to both the bridge axis direction and the bridge axis orthogonal direction. It is a joining method that joins concrete precast decks to each other.
The first concrete precast deck and the second concrete precast deck both have a plurality of joint reinforcing bars protruding in the bridge axis direction from end faces extending in the direction perpendicular to the bridge axis and in the height direction. It has a recess extending from the upper end of the end face in the direction of the bridge axis.
As match a bottom plate of the bottom plate and the second concrete precast slab of the first concrete precast slab, the first concrete precast slab, and the step of placing the second concrete precast slab When,
The first lining plate having a support portion extending downward in a joint space formed between the end face of the first concrete precast deck and the end face of the second concrete precast deck. The process of installing in the recess of the concrete precast deck and the recess of the second concrete precast deck, and
The process of filling the joint space with the filler and
A joining method comprising. The lining plate has a positioning pin that is inserted from above into a hole formed on the upper surface of the recess.
In the step of installing the lining plate in the recess, the pin is inserted into the hole to be set at the height of the upper surface of the first concrete precast deck and the upper surface of the second concrete precast deck. Match the height of the upper surface of the lining plate,
The joining method according to claim 9.

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