JP6869870B2 - Concrete precast floor slab and joining method - Google Patents

Description

The present invention relates to a concrete precast floor slab and a joining method for joining concrete precast floor slabs to each other.

Conventionally, various concrete precast floor slabs and various joining methods thereof have been known. Patent Document 1 describes a joint structure of a concrete precast floor slab. This joint structure is a structure for connecting a pair of floor slabs arranged so as to face each other, and a joint space is formed between the pair of floor slabs. From each floor slab, endless reinforcing bars project in a U shape toward the joint space. Further, a protruding portion protrudes from the lower part of one floor slab toward the joint space, and the tip of the protruding portion is in contact with the other floor slab.

Japanese Unexamined Patent Publication No. 2000-328704

In the above-mentioned joint structure, the protruding portion protruding from the lower part of one floor slab is abutted against the other floor slab, and after arranging a plurality of main reinforcing bars in the joint space, the main reinforcing bar and the U-shaped portion of the endless reinforcing bar are formed. It is constructed by mounting a plurality of coupling members and then filling a joint space located above the protrusion with the tip of the protrusion in contact with the other floor slab. Since the protruding portion protruding from the lower part of the floor slab is formed in a plate shape, there is a concern that it may be cracked or chipped when abutted. Therefore, there is room for improvement in the strength of the joints of concrete precast floor slabs.

An object of the present invention is to provide a concrete precast floor slab capable of increasing the strength of a joint portion and a joining method.

The concrete precast slab according to the present invention is a concrete precast slab 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 plurality of joint reinforcing bars projecting from the end faces extending in the direction perpendicular to the bridge axis and in the height direction in the bridge axis direction, and a plurality of joint reinforcing bars protruding from the end face along the joint reinforcing bars and extending in the bridge axis direction and the height direction. It is provided with a partition wall.

In the concrete precast deck described above, a plurality of joint reinforcing bars project from end faces extending in the direction perpendicular to the bridge axis and in the height direction, and a plurality of partition walls protrude from the end faces. Each of the plurality of partition walls protrudes from the end face and extends in the bridge axis direction and the height direction. Therefore, when the end face is joined toward another concrete precast slab on the other side, a plurality of partition walls can be brought into contact with the concrete precast slab on the other side. Therefore, since the concrete precast slabs are joined to each other with a plurality of partition walls interposed between the end face and the mating concrete precast slab, the strength of the joined portion can be increased.

Further, the concrete precast deck described above may include a bottom slab projecting from the lower side in the height direction of the end face in the bridge axis direction. In this case, by bringing the tip of the bottom slab into contact with the mating concrete precast deck, it is possible to form a joint space in which the lower end is sealed between the concrete precast deck and the mating concrete precast deck. Therefore, the formwork can be eliminated when the filler is injected into the joint space, and the workability can be improved.

Further, the protruding end face of the partition wall extending in the direction perpendicular to the bridge axis and the height direction abuts on the end face of the other mating concrete precast slab, and the protruding end face has a height that matches the height with respect to the mating concrete precast slab. A mating portion may be provided. In this case, by providing a height matching portion on the protruding end face of the partition wall, when the protruding end face of the partition wall is brought into contact with the end face of the mating concrete precast deck, the concrete precast deck with respect to the mating concrete precast deck. The height of can be adjusted. Therefore, the height adjustment of the concrete precast floor slab, which has been troublesome in the past, can be automatically performed, and the height adjustment can be smoothly performed, so that the workability can be further improved.

Further, on the upper surface of the plurality of partition walls, a lining plate provided so as to be continuous with the upper surface of the concrete precast floor slab and the upper surface of the other mating concrete precast floor slab may be arranged. In this case, lining plates are arranged on the upper surfaces of the plurality of partition walls, and the lining plates are provided so as to be continuous with the upper surface of the concrete precast floor slab and the upper surface of the mating concrete precast floor slab. Therefore, by arranging the lining plates, the joint space is closed by the lining plates supported by a plurality of partition walls, and the upper surface of the concrete precast deck, the upper surface of the mating concrete precast deck, and the upper surface of the lining plate are aligned. be able to. Therefore, since the vehicle or the like can be passed through the upper surface of the concrete precast deck, the upper surface of the mating concrete precast deck, and the upper surface of the lining plate, the joining work of each concrete precast deck can be efficiently performed.

Further, the lining plate is formed with an injection hole into which the filler is injected, and the filler may be injected between the injection hole and the plurality of partition walls. In this case, since the filler can be injected into the joint space from the injection hole, the joining work of each concrete precast floor slab can be performed more efficiently.

In addition, through holes extending in the bridge axis direction are formed on the protruding end faces of the partition walls extending in the direction perpendicular to the bridge axis and in the height direction, and the end faces of other mating concrete precast decks joined to the concrete precast deck. A tensioning material that imparts tension to the concrete precast deck and the mating concrete precast deck may be inserted into the through hole. In this case, the tension material is inserted into the through hole extending in the bridge axis direction between the concrete precast deck and the mating concrete precast deck, and the tension material is tightened to form the concrete precast deck and the mating concrete precast deck. It can give tension. Therefore, by applying tension, the adhesive strength between the protruding end face of the concrete precast floor slab and the end face of the mating concrete precast floor slab can be increased, and the end face and the protruding end face can be reinforced. The strength of the concrete can be further increased.

Further, the concrete precast floor slab described above may be provided with a guide pipe that continuously protrudes from the protruding end face into the through hole and is inserted into the through hole of the mating concrete precast floor slab. In this case, by inserting the guide pipe of the concrete precast deck into the through hole of the mating concrete precast deck, the concrete precast deck and the mating concrete precast deck can be easily joined.

The joining method according to the present invention is a joining method for joining the concrete precast deck and the mating concrete precast deck described above, and is a step of applying an adhesive to each protruding end face of a plurality of partition walls and a protruding end face. It is provided with a step of abutting the end faces of the mating concrete precast deck and a step of inserting a tension material into the through hole to apply tension to the concrete precast deck and the mating concrete precast deck.

In this joining method, adhesive is applied to the protruding end faces of a plurality of partition walls, and the protruding end faces are abutted against the end faces of the mating concrete precast deck, so that the joining with the mating concrete precast deck can be easily performed. it can. Further, by inserting a tension material through the through holes of the concrete precast floor slab and the mating side concrete precast floor slab and tightening the tension material, tension force can be applied to the concrete precast floor slab and the mating side concrete precast floor slab. .. Therefore, by applying tension, the adhesive strength between the protruding end face of the concrete precast floor slab and the end face of the mating concrete precast floor slab can be increased, and the end face and the protruding end face can be reinforced. The strength of the concrete can be further increased.

Further, after the abutting step, a step of injecting a filler between a plurality of partition walls is provided, and in a step of applying a tension force, a tension force is applied by tightening the tension material after the injected filler is cured. You may. In this case, by tightening the tension material after the filler filled in the joint space has hardened, it is possible to reinforce the protruding end face of the concrete precast deck and the end face of the mating concrete precast deck, and the concrete precast floor. The entire interface between the slab and the mating concrete precast deck can be compressed. Therefore, the strength of the joint portion can be further increased.

According to the present invention, 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 cross-sectional view when the joint part structure of FIG. 1 is cut by a plane extending in the horizontal direction. 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. (A) is a front view which shows the protruding end face of the partition wall of the concrete precast floor slab. (B) is a front view which shows the deformation example of the protruding end face of the partition wall of the concrete precast floor slab. (A) is a vertical cross-sectional view showing a height matching portion of the protruding end face of FIG. (B) is a vertical cross-sectional view showing a modified example of the height adjusting portion. (C) is a vertical cross-sectional view showing another modified example of the height adjusting portion. (A) is a vertical cross-sectional view showing a through hole and a guide pipe of the protruding end face of FIG. (B) is a figure which shows the tension material which is inserted into the through hole and the guide tube of (a). 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.

Hereinafter, embodiments of the concrete precast floor slab and the 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 floor slab 10 and the second concrete precast floor slab 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 concrete precast decks are arranged along the bridge axial direction D1, and some precast decks of the plurality of concrete precast decks are used as the first concrete precast decks 10 and the second. The concrete precast deck 20 is used.

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, 2 and 3, the lining plate 30 covers the joint space S formed between the first concrete precast slab 10 and the second concrete precast slab 20 from above. It is a member and has an injection hole 31 for filling the joint space S with the filler 40. The lining plate 30 may be made of 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. FIG. 2 is a cross-sectional view when the joint space S is cut by a plane extending in the horizontal direction, and FIG. 3 is a vertical cross-sectional view when the joint space S is cut by a plane extending in the vertical direction. A plurality of injection holes 31 are arranged in 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 floor slab 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, 20 cm or more and 30 cm or less. The length of the joint space S in the bridge axis direction D1 is also 20 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.

From the end surface 11b, an end wall 14 located at the end in the direction D2 perpendicular to the bridge axis, a plurality of partition walls 15, and a bottom slab 17 project. The end wall 14 and the partition wall 15 project from the end surface 11b in the bridge axis direction D1 and form a plate shape extending in the bridge axis direction D1 and the height direction D3. The thickness of the partition wall 15 in the direction perpendicular to the bridge axis D2 is, for example, 8 cm or more and 15 cm or less. In the direction D2 perpendicular to the bridge axis, the plurality of partition walls 15 are arranged between the end walls 14 provided in pairs at both ends. The protruding length of the end wall 14 from the end face 11b and the protruding length of each partition wall 15 from the end face 11b are the same as each other.

For example, the plurality of partition walls 15 are provided at regular intervals along the bridge axis perpendicular direction D2, and the intervals of the plurality of partition walls 15 are, for example, 50 cm or more and 200 cm or less. The number of partition walls 15 provided on the first concrete precast floor slab 10 is, for example, 5 or more and 20 or less. These values can be changed as appropriate. The partition wall 15 has a protruding end surface 16 at the tip end in the bridge axial direction D1. The protruding end face 16 extends in the direction perpendicular to the bridge axis D2 and the height direction D3. The precast block 11 is joined to the precast block 21 in a state where the protruding end surface 16 of the partition wall 15 is in contact with the end surface 21b of the precast block 21. Details of the protruding end face 16 will be described later.

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 the joint space S from below. The protruding length of the bottom slab 17 in the bridge axis direction D1 is the same as the protruding length of the end wall 14 and the protruding length of the partition wall 15.

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 floor slab 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 (for example, two) are arranged along the height direction D3.

The distance between the joint reinforcing bars 12 in the direction D2 perpendicular to the bridge axis is, for example, 15 cm. Like the end wall 14, the partition wall 15, and the bottom slab 17, the joint reinforcing bar 12 projects from the end surface 11b in the bridge axial direction D1, but the protruding length of the joint reinforcing bar 12 is the end wall 14, the partition wall 15, and the bottom slab. 17 Shorter than the protrusion length of each. A plurality of (for example, two) reinforcing bars 12 for joints are provided between the end wall 14 and the partition wall 15 and between the plurality of partition walls 15. In addition to the joint reinforcing bars 12, a plurality of reinforcing bars extending in the direction D2 perpendicular to the bridge axis may be arranged.

The joint reinforcing bar 22 of the second concrete precast floor slab 20 projects from the end face 21b toward the first concrete precast floor slab 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 wall 14 and the partition wall 15 and between the plurality of partition walls 15.

A recess 21c on which the lining plate 30 is arranged is formed on the upper surface 21a of the precast block 21. The recess 21c extends from the upper end of the end surface 21b in the bridge axis direction D1. Further, as shown in FIGS. 3 and 4, the height of each partition wall 15 (the length in the height direction D3) is higher than the height of the upper surface 14a on the end side of the end wall 14 in the direction perpendicular to the bridge axis D2. The lining plate 30 is placed on the lowered portion.

The difference between the height of the upper surface 14a of the end wall 14 and the height of the upper surface 15a of the partition wall 15 coincides with the thickness of the lining plate 30 and the depth of the recess 21c. Further, the area of the rectangular region including the recess 21c and the plurality of upper surfaces 15a in the plan view is substantially the same as the area of the lining plate 30 in the plan view. Therefore, by placing the lining plate 30 on the recess 21c of the precast block 21 and the upper surface 15a of the plurality of partition walls 15, the upper surface 30a of the lining plate 30 becomes the upper surface 11a of the first concrete precast floor slab 10 and the first surface slab 10. It is continuous with the upper surface 21a of the concrete precast floor slab 20 of 2. That is, the lining plate 30 just enters the rectangular region including the recess 21c and the plurality of upper surfaces 15a in a plan view, and the upper surface 11a, the upper surface 21a, and the upper surface 30a of the lining plate 30 are located on the same plane. It is installed like this.

The protruding end face 16 of the partition wall 15 can have various shapes. For example, as shown in FIG. 4A, the protruding end face 16 may project from the bottom plate 17 in a rectangular shape. A haunch portion 15b may be provided at the end of each partition wall 15 on the bottom plate 17 side. Further, as shown in FIG. 4B, the partition wall 15 may have a protruding end face 16A having an inclined portion 16a that is inclined so as to expand toward the bottom slab 17 instead of the protruding end face 16. ..

Although FIG. 4B shows a trapezoidal protruding end face 16A extending downward, the protruding end face 16A may have a pair of inclined portions 16a extending in the entire height direction D3 in this way. It may be a protruding end face having an inclined portion 16a only on the lower side. Since the partition wall 15 having the protruding end faces 16 and 16A as described above has a portion that expands downward, the partition wall 15 can be a highly rigid partition wall 15.

The protruding end faces 16 and 16A are formed with, for example, holes 16b into which a connecting tool for connecting the precast block 21 is inserted into each partition wall 15. The hole portion 16b is formed on the lower side of the protruding end faces 16 and 16A, that is, at a position where the connector can be easily inserted. As shown in FIG. 5A, the connector 23 is inserted into the hole portion 16b of the protruding end faces 16, 16A. The hole portion 16b and the connecting tool 23 are height adjusting portions that match the height of the first concrete precast floor slab 10 with respect to the second concrete precast floor slab 20.

For example, the hole 16b is an insert embedded in the partition wall 15, and the connector 23 is a positioning pin that is press-fitted into the hole 16b. By inserting the connecting tool 23 into the hole 16b, the concrete precast floor slabs 10 and 20 can be held, and the load of the concrete precast floor slabs 10 and 20 can be deposited at the time of temporary construction. The arrangement of the hole portion 16b and the connecting tool 23 may be reversed, that is, the partition wall 15 may include the connecting tool 23 and the precast block 21 may include the hole portion 16b.

As shown in FIG. 5B, instead of the hole portion 16b and the connecting tool 23, a concave portion 16c into which the convex portion 21d of the precast block 21 is inserted is formed in each partition wall 15 as a height adjusting portion. May be good. The convex portion 21d has a shape that fits into the concave portion 16c, and as an example, the convex portion 21d and the concave portion 16c have a hemispherical shape. The shape of the convex portion 21d and the concave portion 16c may be a shape other than a hemispherical shape such as a rectangular shape. Further, the arrangement of the convex portion 21d and the concave portion 16c may be reversed, and the partition wall 15 may have the convex portion 21d and the precast block 21 may have the concave portion 16c.

As shown in FIG. 5C, instead of the hole portion 16b and the connecting tool 23, corrugated uneven portions 16d and 21e are formed on each partition wall 15 and the precast block 21 as height adjusting portions. You may be. The uneven portion 16d may be formed only on the protruding end face 16, or may be formed on the protruding end face of the end wall 14 and the protruding end face of the bottom slab 17 in addition to the protruding end face 16. When the uneven portion 16d is formed on the protruding end surface 16, the protruding end surface of the end wall 14, and the protruding end surface of the bottom slab 17, the uneven portion 16d is formed on the entire protruding end surface of the precast block 11. There is an advantage that the adhesion length between the precast block 11 and the precast block 21 can be lengthened and it is easy to manufacture.

Further, as shown in FIGS. 6A and 6B, through holes 15c and 21f into which the tension member 35 is inserted may be formed in the partition wall 15 and the precast block 21, respectively. The through hole 15c is open to the protruding end face 16 (or the protruding end face 16A), and the through hole 21f is open to the end face 21b. The through hole 15c and the through hole 21f extend in the bridge axis direction D1 at the end face 21b and the protruding end face 16, and are curved downward as they are separated from the end face 21b and the protruding end face 16, for example.

Each of the through hole 15c and the through hole 21f is formed, for example, by embedding a curved sheath tube 15d and a sheath tube 21g. The material of the sheath tube 15d and the sheath tube 21g is composed of a rust preventive material such as ceramic, fiber reinforced plastic (FRP), stainless steel, or a metal which has been subjected to a rust preventive treatment. Each of the sheath tube 15d and the sheath tube 21g has a plurality of convex portions 15e and 21p protruding outward from the sheath tube 15d and the sheath tube 21g. The convex portions 15e and 21p enable more reliable integration of the sheath pipes 15d and 21g with concrete. The convex portions 15e and 21p may be omitted. Further, a guide pipe 15f inserted into the sheath pipe 21g is continuous with the sheath pipe 15d, and the guide pipe 15f protrudes from the protruding end surface 16 in the bridge axial direction D1.

The end of the sheath tube 15d on the opposite side to the guide tube 15f is curved downward, and the opening 15g of the sheath tube 15d is formed in a recess 15h recessed from the lower surface 15k of the partition wall 15. The recess 15h is formed by an inner surface 15j including an opening 15g and an inner surface 15m extending from the upper end of the inner surface 15j to the lower surface 15k. Since the inner surfaces 15j and 15m are inclined with respect to the bridge axis direction D1 and the recess 15h is notched diagonally, the notch amount can be reduced. Therefore, it is possible to suppress a decrease in the strength of the precast block 11.

The normal direction of the opening 15g (the direction in which the sheath tube 15d extends from the opening 15g) coincides with the normal direction of the inner surface 15j. In addition, instead of the concave portion 15h that is notched diagonally, a mountain-shaped convex portion that protrudes diagonally may be provided, and an opening 15 g may be formed on the outer surface of the convex portion. Further, the sheath tube 21g of the precast block 21 has the same configuration as the sheath tube 15d. That is, the opening 21h of the sheath tube 21g is formed in the recess 21k recessed from the lower surface 21j, the recess 21k is formed by the inner surface 21m including the opening 21h and the inner surface 21n, and the normal direction of the opening 21h is the normal direction of the inner surface 21m. Match.

As described above, the tension material 35 is inserted into and tightened through the through hole 15c and the through hole 21f. The tension member 35 is composed of, for example, a bending bolt 35a that curves and extends in a curved shape, a pair of washers 35b, and a pair of nuts 35c. Male screw portions 35d are formed on both ends of the bending bolt 35a, and the nut 35c is screwed into the male screw portion 35d. The tension member 35 includes the precast block 21 and the partition wall by inserting the bending bolt 35a into the through hole 15c and the through hole 21f and tightening each nut 35c to the male screw portion 35d through the washer 35b at the openings 15g and 21h. Gives tension to 15.

Next, a joining method for joining the first concrete precast floor slab 10 and the second concrete precast floor slab 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 floor slab 10 and the second concrete precast floor slab 20 are installed by lifting and lowering. At this time, the adhesive A is applied to the protruding end faces 16 of each partition wall 15 of the first concrete precast floor slab 10 (step of applying the adhesive). Adhesive A is provided to correct the unevenness of the protruding end face 16.

Then, as shown in FIGS. 2 and 3, the protruding end surface 16 of each partition wall 15 of the first concrete precast deck 10 and the end surface 21b of the second concrete precast deck 20 are abutted (butting step). .. At this time, the end wall 14 and the end face 21b abut, and the bottom slab 17 and the end face 21b abut. The protruding end face 16 and the end face 21b are butted so that the joint reinforcing bar 12 of the first concrete precast floor slab 10 and the joint reinforcing bar 22 of the second concrete precast floor slab 20 are staggered.

After abutting the protruding end face 16 and the end face 21b, the lining plate 30 is installed on the upper surface 15a of each partition wall 15 of the first concrete precast slab 10 and the recess 21c of the second concrete precast slab 20. To do. 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, an embedding material that fills the gap may be injected between the lining plate 30 and the precast block 21 and between the lining plate 30 and the precast block 11. 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 31 of the lining plate 30.

After the filler 40 filled in the joint space S has hardened, the first concrete precast slab 10 and the second concrete precast slab 20 are formed as shown in FIGS. 6 (a) and 6 (b). A tension material 35 for imparting tension is installed (step of imparting tension). Specifically, the bending bolt 35a is inserted into the through holes 15c and 21f from the opening 15g or the opening 21h, the washer 35b is brought into contact with the inner surfaces 15j and 21m, and the nut 35c is screwed into the male screw portion 35d with the nut 35c. By pressing the washer 35b, the tension member 35 is tightened.

The tightening of the tension material 35 is preferably performed after the filler 40 is cured, but it can also be performed at a different timing. For example, when aligning the concrete precast floor slabs 10 and 20, the tension material 35 may be lightly tightened to strike the filler 40, and the tension material 35 may be strongly tightened after the filler 40 has hardened. After installing the tension member 35 as described above, the joint structure 1 is completed.

Next, the operation and effect of the first concrete precast floor slab 10 and the joining method according to the present embodiment will be described in detail. As shown in FIG. 2, in the first concrete precast deck 10, a plurality of joint reinforcing bars 12 project from the end faces 11b extending in the direction perpendicular to the bridge axis D2 and the height direction D3, and a plurality of partition walls extend from the end faces 11b. 15 is protruding. Each of the plurality of partition walls 15 projects from the end surface 11b and extends in the bridge axis direction D1 and the height direction D3.

Therefore, when the end face 11b is joined toward the second concrete precast slab 20, the plurality of partition walls 15 can be brought into contact with the second concrete precast slab 20. Therefore, the first concrete precast floor slab 10 and the second concrete precast floor slab 20 are joined with a plurality of partition walls 15 interposed between the end face 11b and the second concrete precast floor slab 20. The strength of the part can be increased.

Further, as shown in FIG. 3, the first concrete precast deck 10 includes a bottom slab 17 projecting from the lower side of the end surface 11b in the height direction D3 in the bridge axial direction D1. By bringing the tip of the bottom slab 17 into contact with the second concrete precast floor slab 20, a joint space S whose lower end is sealed is formed between the first concrete precast floor slab 10 and the second concrete precast floor slab 20. Can be formed. Therefore, when the filler 40 is filled in the joint space S, the formwork can be eliminated, and the workability can be improved.

Further, the protruding end face 16 of the partition wall 15 extending in the direction perpendicular to the bridge axis D2 and the height direction D3 abuts on the end face 21b of the second concrete precast floor slab 20, and the protruding end face 16 is as shown in FIG. A hole 16b, a recess 16c or a concave-convex portion 16d is provided as a height adjusting portion. Therefore, by providing the height matching portion on the protruding end surface 16 of the partition wall 15, when the protruding end surface 16 of the partition wall 15 is brought into contact with the end surface 21b of the second concrete precast deck 20, the second concrete precast The height of the first concrete precast deck 10 with respect to the deck 20 can be adjusted. Therefore, the height adjustment of the concrete precast floor slab, which has been troublesome in the past, can be automatically performed, and the height adjustment can be smoothly performed, so that the workability can be further improved. Further, in the height adjusting portion (hole portion 16b, recess 16c or uneven portion 16d) of the present embodiment, not only the height but also the horizontal alignment can be automatically performed.

Further, on the upper surface 15a of the plurality of partition walls 15, a lining plate 30 provided so as to be 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 is arranged. To. That is, the lining plate 30 is arranged on the upper surface 15a of the plurality of partition walls 15, and the lining plate 30 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. It is provided as follows.

Therefore, as shown in FIG. 3, by arranging the lining plates 30, the joint space S is closed by the lining plates 30 supported by the plurality of partition walls 15, and the upper surface 11a of the first concrete precast floor slab 10 The upper surface 21a of the second concrete precast floor slab 20 and the upper surface 30a of the lining plate 30 can be aligned. Therefore, since a vehicle or the like can be passed through the upper surface 11a of the first concrete precast deck 10, the upper surface 21a of the second concrete precast deck 20, and the upper surface 30a of the lining plate 30, each concrete precast deck 10 can be passed. , 20 can be joined efficiently.

Further, as shown in FIG. 1, an injection hole 31 into which the filler 40 is injected is formed in the lining plate 30, and the filler 40 is injected between the injection hole 31 and the plurality of partition walls 15. .. Therefore, since the filler 40 can be injected into the joint space S from the injection hole 31, the joining work of the concrete precast floor slabs 10 and 20 can be performed more efficiently.

Further, the projecting end surface 16 of the partition wall 15 extending in the direction D2 perpendicular to the bridge axis and the height direction D3, and the end surface 21b of the second concrete precast deck 20 joined to the first concrete precast deck 10 are shown in FIG. As shown in 6 (a) and 6 (b), through holes 15c and 21f extending in the bridge axial direction D1 are formed, and the through holes 15c and 21f are formed with the first concrete precast deck 10 and the through holes 15c and 21f. A tension material 35 that imparts tension to the second concrete precast deck 20 is inserted.

Therefore, the tension material 35 is inserted into the through holes 15c and 21f extending in the bridge axial direction D1 between the first concrete precast deck 10 and the second concrete precast deck 20 to tighten the tension material 35. It is possible to apply tension to the concrete precast deck 10 and the second concrete precast deck 20 of the above. Therefore, by applying the tension force, the adhesive strength between the protruding end face 16 of the first concrete precast floor slab 10 and the end face 21b of the second concrete precast floor slab 20 can be increased, and the end face 21b and the protruding end face 16 can be combined. Since it can be reinforced, the strength of the joint portion can be further increased.

Further, the first concrete precast floor slab 10 is provided with a guide pipe 15f that is continuously projected from the protruding end surface 16 into the through hole 15c and is inserted into the through hole 21f of the second concrete precast floor slab 20. Therefore, by inserting the guide pipe 15f of the first concrete precast deck 10 into the through hole 21f of the second concrete precast deck 20, the first concrete precast deck 10 and the second concrete precast deck 20 are inserted. Can be easily joined. Further, by providing the guide tube 15f protruding from the protruding end surface 16, it is possible to suppress the invasion of the adhesive A into the through hole 15c.

In the joining method according to the present embodiment, the adhesive A is applied to the protruding end faces 16 of the plurality of partition walls 15, and the protruding end faces 16 are abutted against the end faces 21b of the second concrete precast floor slab 20 to form the second concrete. Joining with the precast floor slab 20 can be easily performed. Further, by inserting the tension material 35 into the through holes 15c and 21f of the first concrete precast floor slab 10 and the second concrete precast floor slab 20 and tightening the tension material 35, the first concrete precast floor slab 10 and Tension can be applied to the second concrete precast floor slab 20. Therefore, as described above, the adhesive force between the protruding end surface 16 and the end surface 21b of the second concrete precast floor slab 20 can be increased, so that the strength of the joint portion can be further increased.

Further, after the abutting step, a step of injecting the filler 40 between the plurality of partition walls 15 is provided, and in the step of applying the tension force, the tension material 35 is tightened after the injected filler 40 is cured. You may give tension. In this case, by tightening the tension material 35 after the filler 40 filled in the joint space S has hardened, the protruding end faces 16 of the first concrete precast deck 10 and the end faces 21b of the second concrete precast deck 20 Can be reinforced, and the entire interface between the first concrete precast deck 10 and the second concrete precast deck 20 can be compressed. Therefore, the strength of the joint portion can be further increased.

(Second Embodiment)
Next, the joint structure 41 according to the second embodiment will be described with reference to FIG. 7. As shown in FIG. 7, the joint structure 41 is provided on a point where the lining plate 50 includes a pin 51 for positioning and an anchor bar 52, and on the upper surface 61a of the precast block 61 of the second concrete precast floor slab 60. It is different from the first embodiment in that the formed recess 61c is provided with a hole 61d recessed in the height direction D3. Hereinafter, the description overlapping with the first embodiment will be omitted as appropriate.

The hole 61d is formed on the upper surface 61e of the recess 61c. The hole 61d is, for example, an insert embedded in the precast block 61, and a pin 51 fixed to the lining plate 50 is press-fitted into the hole 61d. The hole portion 61d and the pin 51 function as a positioning portion for positioning the lining plate 50 with respect to the second concrete precast floor slab 60. The positioning portion may have a shape different from that of the hole portion 61d and the pin 51, such as a concave portion and a convex portion, or a corrugated uneven portion. The anchor bar 52 extends downward from the lower surface 50a of the lining plate 50, and a folded-back portion 52a is provided at the tip of the anchor bar 52. The folded-back portion 52a is curved upward in a U-shape from the lower part of the anchor muscle 52 and folded back. The anchor bar 52 is arranged in the joint space S and is embedded in the filler 40.

In the joint portion structure 41 according to the second embodiment, as in the first embodiment, a state in which a plurality of partition walls 15 are interposed between the end surface 11b of the first concrete precast deck 10 and the second concrete precast deck 60. The first concrete precast deck 10 and the second concrete precast deck 60 are joined together. Therefore, since the strength of the joint portion can be increased, the same effect as that of the first embodiment can be obtained.

Further, the lining plate 50 has a positioning pin 51 that is inserted from above into the hole 61d formed in the upper surface 61e of the recess 61c. Therefore, by inserting the alignment pin 51 into the hole 61d formed in the upper surface 61e of the recess 61c, the lining plate 50 can be easily aligned with the recess 61c. Therefore, the installation work of the lining plate 50 can be easily performed. Further, the lining plate 50 has an anchor bar 52 protruding downward in the joint space S. Therefore, by embedding the anchor bar 52 in the filler 40 in the joint space S, the joint strength between the first concrete precast deck 10 and the second concrete precast deck 60 can be further increased.

Although each embodiment of the concrete precast floor slab 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 in. That is, the configuration of each part of the concrete precast floor slab 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 first concrete precast floor slab 10 in which a plurality of plate-shaped partition walls 15 are provided has been described, but the shape, size, number, material, and arrangement mode of the partition walls are the same as those in the above-described embodiment. It is not limited and can be changed as appropriate.

Further, in the above-described embodiment, an example in which the tension force is applied by the tension member 35 provided with the bending bolt 35a has been described, but the shape, size, number, material, and arrangement mode of the tension member can be appropriately changed. .. For example, it is also possible to apply tension by a tensioning material with linear bolts.

Further, in the above-described embodiment, an example in which through holes 15c and 21f are formed by the sheath tube 15d, the sheath tube 21g and the guide tube 15f has been described, but the shape, size, number, material and material of the sheath tube and the guide tube have been described. The arrangement mode can be changed as appropriate. It is also possible to omit the guide tube 15f.

Further, in the above-described embodiment, as shown in FIGS. 2 and 3, an example in which the first concrete precast floor slab 10 includes an end wall 14, a partition wall 15, and a bottom slab 17 has been described. However, both the first concrete precast slab 10 and the second concrete precast slab 20 may include end walls, bulkheads, and bottom slabs. In this case, the protruding lengths of the end walls, partition walls, and bottom slabs protruding from the concrete precast floor slabs 10 and 20 are half the protruding lengths of the above-described embodiments, and are therefore shorter than the protruding lengths of the joint reinforcing bars 12 and 22. Become.

Further, in the above-described embodiment, the lining plate 50 provided with the pin 51 and the anchor bar 52 has been described, but the shape, size, number, material and arrangement mode of the pin and anchor bar in the lining plate are appropriately changed. It is possible.

1,41 ... Joint structure, 10 ... First concrete precast floor slab (concrete precast floor slab) 11,21,61 ... Precast block, 11a, 21a, 61a ... Top surface, 11b, 21b ... End face, 12, 22 ... Reinforcing bar for joint, 13 ... Diameter expansion member, 14 ... End wall, 14a ... Top surface, 15 ... Partition wall, 15a ... Top surface, 15b ... Haunch part, 15c ... Through hole, 15d ... Sheath tube, 15e, 21p ... Convex part , 15f ... guide tube, 15g ... opening, 15h ... concave, 15j, 15m ... inner surface, 15k ... lower surface, 16, 16A ... protruding end surface, 16a ... inclined portion, 16b ... hole portion, 16c ... concave portion, 16d ... uneven portion, 17 ... Bottom slab, 20, 60 ... Second concrete precast floor slab (counterpart concrete precast floor slab), 21c, 61c ... Concave, 21d ... Convex, 21e ... Concavo-convex, 21f ... Through hole, 21g ... Sheath tube, 21h ... opening, 21j ... lower surface, 21k ... concave, 21m, 21n ... inner surface, 23 ... fitting, 30, 50 ... lining plate, 30a ... upper surface, 31 ... injection hole, 35 ... tension material, 35a ... bending bolt, 35b ... Washer, 35c ... Nut, 35d ... Male screw part, 40 ... Filler, 50a ... Bottom surface, 51 ... Pin, 52 ... Anchor bar, 52a ... Folded part, 61d ... Hole part, 61e ... Top surface, A ... Adhesive , D1 ... Bridge axis direction, D2 ... Bridge axis perpendicular direction, D3 ... Height direction.

Claims (9)

A concrete precast slab 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 perpendicular direction.
A plurality of joint reinforcing bars protruding in the bridge axis direction from the end faces extending in the direction perpendicular to the bridge axis and the height direction, and
A plurality of partition walls protruding from the end face along the reinforcing bar for the joint and extending in the bridge axis direction and the height direction.
Concrete precast floor slab with. A bottom slab projecting from the lower side of the end face in the height direction in the bridge axis direction is provided.
The concrete precast floor slab according to claim 1. The protruding end faces of the partition walls extending in the direction perpendicular to the bridge axis and the height direction come into contact with the end faces of other mating concrete precast slabs.
The protruding end face is provided with a height adjusting portion for adjusting the height with respect to the mating concrete precast floor slab.
The concrete precast floor slab according to claim 1 or 2. On the upper surface of the plurality of partition walls, a lining plate provided so as to be continuous with the upper surface of the concrete precast floor slab and the upper surface of the other mating concrete precast floor slab is arranged.
The concrete precast floor slab according to any one of claims 1 to 3. An injection hole into which the filler is injected is formed in the lining plate, and the filler is injected between the injection hole and the plurality of partition walls.
The concrete precast floor slab according to claim 4. The protruding end faces of the partition wall extending in the direction perpendicular to the bridge axis and the height direction, and the end faces of other mating concrete precast decks joined to the concrete precast deck slabs have penetrations extending in the bridge axis direction. Holes are formed
A tension material that imparts tension to the concrete precast floor slab and the mating concrete precast floor slab is inserted into the through hole.
The concrete precast floor slab according to any one of claims 1 to 5. It is provided with a guide pipe that continuously protrudes from the protruding end face into the through hole and is inserted into the through hole of the mating concrete precast floor slab.
The concrete precast floor slab according to claim 6. A joining method for joining the concrete precast floor slab according to claim 6 or 7 and the concrete precast floor slab on the other side.
A step of applying an adhesive to each of the protruding end faces of the plurality of partition walls, and
The step of abutting the end face of the mating concrete precast floor slab against the protruding end face, and
A step of inserting a tension material through the through hole to apply tension to the concrete precast floor slab and the mating concrete precast floor slab.
A joining method comprising. After the abutting step, a step of injecting a filler between the plurality of partition walls is provided.
In the step of applying the tension force, the tension force is applied by tightening the tension material after the injected filler is cured.
The joining method according to claim 8.

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