JP6932049B2 - Connection structure and connection method - Google Patents

Description

The present invention relates to a connecting structure for connecting precast decks and a connecting method.

Conventionally, various connecting structures and connecting methods for connecting precast decks have been known. Patent Document 1 describes a method of erection of a precast deck. In this erection method, two precast decks with loop-shaped joints adjacent to each other in the bridge axis direction are connected.

Between the two precast decks, a loop-shaped joint protruding from each precast deck and a plurality of reinforcing bars extending in the direction perpendicular to the bridge axis are arranged. Further, the two precast decks are integrated by placing a curable material made of concrete between the two precast decks.

Japanese Patent No. 5337122

The connection work of the precast deck may be required to be carried out promptly. However, as described above, a loop-shaped joint and a reinforcing bar must be placed between the two precast decks, and a filler such as a curable material must be placed to wait for curing. Therefore, the precast floor must be waited for curing. The current situation is that plate construction cannot be performed promptly.

Further, when jet concrete that hardens in about 3 hours is used as the filler to be cast, the connecting operation can be performed quickly. However, jet concrete has a problem that it is easily shrunk and cracks may occur after the fact, and deterioration factors are easily invaded from the cracks. Therefore, when jet concrete is used as the filler, there is a concern that the quality may deteriorate, and there is room for improvement in terms of maintaining durability.

An object of the present invention is to provide a connecting structure and a connecting method of a precast deck slab that can be quickly constructed and can maintain durability.

The connecting structure according to the present invention is a connecting structure in which the first precast floor slab and the second precast floor slab are connected via a connecting member, and the first precast floor slab faces the second precast floor slab. A first precast block having one end face and a first reinforcing bar embedded in the first precast block and protruding from the first end face are provided, and the second precast floor slab has a second end face facing the first end face. It includes a second precast block and a second reinforcing bar embedded in the second precast block and protruding from the second end face, and both the first end face and the second end face are inclined in a direction in which they protrude vertically downward. The connecting member is opposed to each of the first end surface and the second end surface, and has a pair of side plate portions having holes through which the first reinforcing bar and the second reinforcing bar are passed, and a pair of side plate portions. It has an upper surface of the first precast floor slab and an upper plate portion provided so as to be continuous with the upper surface of the second precast floor slab.

In the connection structure described above, both the first end face of the first precast deck and the second end face of the second precast deck are inclined in a direction in which they protrude vertically downward. That is, the first end face and the second end face are inclined so as to protrude vertically downward. The connecting member includes a pair of side plate portions that pass the first reinforcing bar and the second reinforcing bar and face each of the first end surface and the second end surface, and an upper plate portion that connects the upper ends of the pair of side plate portions. Since the first end face, the second end face, and the pair of side plate portions are all inclined in the direction of projecting from each other toward the vertically downward direction, when the connecting member is inserted from above, each side plate portion is inserted into the first end face and the first side plate portion. It can be brought close to each of the two end faces. Therefore, the connecting member can be easily inserted, and the gap between the connecting member and the first end face and the gap between the connecting member and the second end face can be reduced. Therefore, the connection work can be carried out promptly. Further, even if a force is applied to the connecting member from vertically above, the force can be resisted by the pair of inclined side plate portions. That is, the shear resistance of the first precast deck, the second precast deck, and the connecting member can be increased by the pair of inclined side plate portions. Therefore, the durability of the first precast deck, the second precast deck, and the connecting member can be maintained.

Further, the above-mentioned connecting structure may include a filler that fills a region surrounded by a pair of side plate portions and an upper plate portion. In this case, since the filler is placed between the pair of side plate portions and the upper plate portion, the durability of the first precast deck, the second precast deck and the connecting member can be improved, and the connecting structure can be improved. Can enhance the structural integrity of.

Further, the above-mentioned connecting structure may include a tightening member for tightening each of the first reinforcing bar and the second reinforcing bar in each of the pair of side plate portions. In this case, since the first reinforcing bar and the second reinforcing bar are tightened to each of the pair of side plate portions by the tightening member, the first precast floor slab, the second precast floor slab, and the connecting member can be more firmly connected.

Further, the above-mentioned connecting structure may include an embedded member embedded in a gap between the side plate portion and the first end surface and a gap between the side plate portion and the second end surface. In this case, the structural integrity of the first precast deck, the second precast deck and the connecting member can be further enhanced.

Further, the above-mentioned connecting structure may include ribs protruding from the lower surface of the upper plate portion and the inner surface of each side plate portion. In this case, the connecting member can be reinforced by ribs extending from each of the upper plate portion and the pair of side plate portions. Therefore, since the strength of the connecting member can be increased, the connection by the connecting member can be further strengthened.

The connecting method according to the present invention is a connecting method in which the first precast floor slab and the second precast floor slab are connected via a connecting member, and the first precast floor slab faces the second precast floor slab. A first precast block having one end face and a first reinforcing bar embedded in the first precast block and protruding from the first end face are provided, and the second precast slab has a second end face facing the first end face. It includes a second precast block and a second reinforcing bar embedded in the second precast block and protruding from the second end face, and both the first end face and the second end face are inclined in a direction in which they protrude vertically downward. By abutting the first end face and the second end face along the bridge axis direction, both the first end face and the second end face are inclined in the direction of protruding vertically downward. The step of arranging the first precast floor slab and the second precast floor slab, and the pair of side plate portions of the connecting member are opposed to each of the first end face and the second end face, and the first reinforcing bar and the second reinforcing bar are respectively opposed to each other. It is provided with a step of arranging the connecting member through the hole of the side plate portion so that the upper plate portion of the connecting member is continuous with the upper surface of the first precast floor slab and the upper surface of the second precast floor slab.

In the connection method described above, both the first end face of the first precast deck and the second end face of the second precast deck are inclined in a direction in which they protrude vertically downward. The connecting member includes a pair of side plate portions that pass the first reinforcing bar and the second reinforcing bar and face each of the first end surface and the second end surface, and the pair of side plate portions, the first end surface, and the second end surface are both. , Tilt in the direction of protruding from each other as it goes vertically downward. Therefore, when the connecting member is inserted from above, each side plate portion can be brought close to each of the first end surface and the second end surface. Therefore, the connecting member can be easily inserted, and the gap between the connecting member and the first end face and the gap between the connecting member and the second end face can be reduced. As a result, similar to the above-mentioned connection structure, the construction can be carried out promptly and the durability can be maintained.

Further, the above-mentioned connecting method may include a step of filling the area surrounded by the pair of side plate portions and the upper plate portion with the filler. In this case, by placing a filler between the pair of side plate portions and the upper plate portion, the durability of the first precast deck slab, the second precast deck slab, and the connecting member can be enhanced. Therefore, it is possible to enhance the structural integrity of the connecting structure including the first precast deck, the second precast deck, and the connecting member.

Further, the connection method described above may include a step of tightening each of the first reinforcing bar and the second reinforcing bar by a tightening member in each of the pair of side plate portions. In this case, since the first reinforcing bar and the second reinforcing bar are tightened by the tightening members at each of the pair of side plate portions, the first precast deck slab, the second precast deck slab, and the connecting member can be more firmly connected.

Further, the connection method described above may include a step of embedding the embedding member in the gap between the side plate portion and the first end surface and the gap between the side plate portion and the second end surface. In this case, the structural integrity of the first precast deck, the second precast deck and the connecting member can be further enhanced.

According to the present invention, the construction can be carried out quickly and the durability can be maintained.

It is sectional drawing which shows the connection structure which concerns on 1st Embodiment. It is a top view which shows the connection structure of FIG. It is sectional drawing which shows the connection structure of FIG. It is a perspective view which shows the connecting member of the connecting structure of FIG. It is sectional drawing which shows the connection method which concerns on 1st Embodiment. It is sectional drawing which shows the continuation of the connection method of FIG. It is a figure which shows an example of the embedded member. It is sectional drawing which shows the continuation of the connection method of FIG. It is sectional drawing which shows the connection method which concerns on 2nd Embodiment. (A) and (b) are sectional views which show the connection structure which concerns on 3rd Embodiment.

Hereinafter, embodiments of the connection structure and connection method of the precast deck 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 dimensional ratios, angles, etc. are not limited to those described in the drawings.

(First Embodiment)
FIG. 1 is a cross-sectional view showing a connecting structure 1 in which a first precast deck 10 and a second precast deck 20 are connected. FIG. 2 is a plan view showing the connection structure 1. Both the first precast floor slab 10 and the second precast floor slab 20 are made of concrete. The connecting structure 1 is a structure in which the first precast deck 10 and the second precast deck 20 are connected via a connecting member 30.

For example, the first precast deck 10 and the second precast deck 20 are precast decks forming a highway bridge. On the highway, a plurality of precast decks are arranged along the bridge axis direction D1, and some of the plurality of precast decks are used as the first precast deck 10 and the second precast deck 20. It is said. The shape and size of the first precast deck 10 may be the same as or different from the shape and size of the second precast deck 20.

In the present embodiment, the first precast deck 10, the second precast deck 20, and the connecting member 30 are manufactured in advance at the factory, and the first precast deck 10, the second precast deck 20, and the connecting member 30 are manufactured in advance. Is transported to the site. The direction in which the first precast deck 10, the connecting member 30, and the second precast deck 20 are connected and the bridge axis direction D1 coincide with each other.

The first precast deck 10 includes a first precast block 11 having a substantially rectangular parallelepiped shape, and a first reinforcing bar 12 extending in the bridge axis direction D1. The second precast floor slab 20 includes a second precast block 21 and a second reinforcing bar 22 similar to the first precast block 11 and the first reinforcing bar 12.

The first precast block 11 and the second precast block 21 form, for example, road surface portions extending in the bridge axis direction D1 and the bridge axis perpendicular direction D2. That is, the upper surface 11a of the first precast block 11 and the upper surface 21a of the second precast block 21 both form a road surface.

The first precast block 11 and the second precast block 21 have a thickness in the vertical direction D3. The thickness of the first precast block 11 and the second precast block 21 in the vertical direction D3 is, for example, 20 cm or more and 24 cm or less, and the average length of the joint space T in the bridge axis direction D1 is also 20 cm or more and 24 cm or less. However, these values can be changed as appropriate.

Since the first precast block 11 and the second precast block 21 are, for example, portions forming the road surface of a road bridge, they receive a load from a vehicle or the like. Further, a connecting structure is formed by connecting the first end surface 11b located at one end of the bridge axis direction D1 of the first precast block 11 and the second end surface 21b located at one end of the bridge axis direction D1 of the second precast block 21. 1 is constructed.

The first end surface 11b is a surface facing the second end surface 21b in the bridge axial direction D1. The first end surface 11b and the second end surface 21b are, for example, both flat surfaces. Both the first end surface 11b and the second end surface 21b are inclined surfaces that incline in a direction in which they protrude vertically downward. That is, the first end surface 11b extends vertically downward toward the second end surface 21b, and the second end surface 21b extends vertically downward toward the first end surface 11b. The distance between the first end surface 11b and the second end surface 21b decreases vertically downward.

Both the first end surface 11b and the second end surface 21b are inclined with respect to the vertical surface S, and the inclination angle θ1 of the first end surface 11b with respect to the vertical surface S is, for example, 5 ° or more and 15 ° or less. The inclination angle θ2 of the second end surface 21b with respect to the vertical surface S is also, for example, 5 ° or more and 15 ° or less. However, these values can be changed as appropriate.

When the inclination angles θ1 and θ2 are 5 ° or more, the connecting member 30 can be inserted from above more easily, and the resistance to the force (shearing force) from above on the connecting member 30 is further enhanced. be able to. Further, when the inclination angles θ1 and θ2 are 15 ° or less, the concern that the connecting member 30 may come out from the joint space T can be eliminated. The inclination angle θ1 and the inclination angle θ2 may be the same as each other or may be different from each other.

For example, a screw is formed on the outer peripheral surface of the first reinforcing bar 12. The first reinforcing bar 12 is, for example, a dowel reinforcing bar that causes a dowel action (dowel action) when a force is applied in the vertical direction D3. Due to the dowel action of the first reinforcing bar 12, the dowel effect of resisting the shearing of the connecting structure 1 is exhibited. The first reinforcing bar 12 is embedded in the first precast block 11 and protrudes from the first end surface 11b in a rod shape.

The first reinforcing bar 12 has a protruding portion 12a protruding from the first end surface 11b and a buried portion 12b embedded in the first precast block 11. The projecting portion 12a extends linearly toward the second precast deck 20, and the buried portion 12b extends continuously from each projecting portion 12a in the bridge axial direction D1.

A plurality of first reinforcing bars 12 are arranged in the first precast floor slab 10. The protruding portion 12a is a shear key that protrudes from the first end surface 11b to the second end surface 21b side. A plurality of projecting portions 12a are arranged along the bridge axis perpendicular direction D2, and a plurality (for example, two) are arranged along the vertical direction D3. The base end of the protrusion 12a located in the lower part of the vertical direction D3 is located closer to the second precast deck 20 than the base end of the protrusion 12a located in the upper part.

The configuration and action of the second reinforcing bar 22 are, for example, the same as the configuration and action of the first reinforcing bar 12. The second reinforcing bar 22 is embedded in the second precast block 21 and protrudes from the second end surface 21b in a rod shape. The second reinforcing bar 22 has a protruding portion 22a protruding from the second precast block 21 and a buried portion 22b embedded in the second precast block 21.

The protruding portion 22a is a shear key that protrudes from the second end surface 21b toward the first end surface 11b. The protrusion 22a extends linearly toward the first precast deck 10. The arrangement of the protrusions 22a is, for example, the same as the arrangement of the protrusions 12a, and the height of each protrusion 22a is the same as the height of each protrusion 12a.

The connecting member 30 is arranged in a joint space T (joint space) located between the first end surface 11b and the second end surface 21b. The connecting member 30 is formed of, for example, a steel plate. The connecting member 30 extends long in the joint space T in the direction D2 perpendicular to the bridge axis, and the shape of the connecting member 30 in a plan view is a rectangular shape extending long in the direction D2 perpendicular to the bridge axis.

The connecting member 30 includes a pair of side plate portions 31 and an upper plate portion 32 that connects the upper ends of the pair of side plate portions 31 to each other. The upper surface 32a of the upper plate portion 32 is flush with, for example, the upper surface 11a of the first precast deck 10 and the upper surface 21a of the second precast deck 20. The cross section of the connecting member 30 when cut in a plane extending in the bridge axial direction D1 and the vertical direction D3 has, for example, an isosceles trapezoidal shape in which the upper base is longer than the lower base, that is, the two side plate portions 31 have an inverted C shape. It is a shaped shape.

The angle of the side plate portion 31 with respect to the upper plate portion 32 is an acute angle. Each side plate portion 31 is inclined with respect to the vertical surface S described above, and the inclination angle of each side plate portion 31 with respect to the vertical surface S is, for example, the same as the inclination angles θ1 and θ2. In this case, each side plate portion 31 extends parallel to each of the first end surface 11b and the second end surface 21b.

As shown in FIGS. 1 and 3, each of the pair of side plate portions 31 is a side steel plate facing the first end surface 11b and the second end surface 21b, respectively. The side plate portion 31 has an outer surface 31a facing each of the first end surface 11b and the second end surface 21b, and an inner surface 31b facing the opposite side of the outer surface 31a.

The outer surface 31a and the inner surface 31b are both flat surfaces, for example. The gap K1 between the outer surface 31a and the first end surface 11b and the gap K2 between the outer surface 31a and the second end surface 21b are preferably narrow from the viewpoint of force transmission, for example, when the gaps K1 and K2 are wide. Is embedded with an embedded member 40 such as a filling member 41 or a shim 42 (see FIGS. 6 and 7) described later.

The inner surface 31b is provided with a tightening member 50 for tightening each of the first reinforcing bar 12 and the second reinforcing bar 22 to the inner surface 31b. Further, the side plate portion 31 has a hole portion 31c that penetrates the outer surface 31a and the inner surface 31b and through which each of the first reinforcing bar 12 and the second reinforcing bar 22 is passed. The hole 31c is provided at a position facing the protrusions 12a and 22a, which are shear keys, and engages with the protrusions 12a and 22a, respectively.

The hole portion 31c is, for example, a notch portion cut out from an end portion 31d located on the opposite side of the side plate portion 31 to the upper plate portion 32 toward the upper plate portion 32. The side of the hole 31c opposite to the end 31d is curved in an inverted U shape, for example. Each of the first reinforcing bar 12 and the second reinforcing bar 22 is inserted into each hole 31c from the bottom.

The tightening member 50 includes a washer 51 that is pressed against the inner surface 31b, and a nut 52 that presses the washer 51 against the inner surface 31b on the opposite side of the washer 51 from the inner surface 31b. The nut 52 is screwed into the screws formed on the outer peripheral surfaces of the first reinforcing bar 12 and the second reinforcing bar 22. The washer 51 is pressed against each inner surface 31b by the nut 52 screwed into each of the first reinforcing bar 12 and the second reinforcing bar 22, so that each of the first reinforcing bar 12 and the second reinforcing bar 22 is tightened.

The upper plate portion 32 is an upper surface steel plate that covers the joint space T so that the upper surface 11a and the upper surface 21a are continuous. The upper plate portion 32 has an upper surface 32a continuous with the upper surface 11a and the upper surface 21a, and a lower surface 32b facing the opposite side of the upper surface 32a. The upper surface 32a and the lower surface 32b are both flat surfaces, for example. As shown in FIGS. 2, 3 and 4, ribs 33 for reinforcing the connecting member 30 project from the lower surface 32b of the upper plate portion 32 and the inner surface 31b of each side plate portion 31.

The rib 33 is, for example, a partition steel plate extending in a direction intersecting both the side plate portion 31 and the upper plate portion 32. A plurality of ribs 33 are provided, for example, and the plurality of ribs 33 are arranged so as to be arranged along the bridge axis perpendicular direction D2. As an example, the plurality of ribs 33 are arranged at equal intervals along the bridge axis perpendicular direction D2, and a hole portion 31c is formed between the two ribs 33. That is, the ribs 33 and the holes 31c may be provided alternately along the bridge axis perpendicular direction D2. However, the number and arrangement of the ribs 33 can be changed as appropriate. The intersection of the rib 33, the upper plate portion 32, and the side plate portion 31 may be cut out in consideration of the filler property (air bleeding).

As shown in FIG. 1, the region surrounded by the pair of side plate portions 31 and the upper plate portion 32 is filled with the filler 60. The filler 60 is, for example, a cement-based solidifying material, and is integrated with the protrusions 12a and 22a and the tightening member 50, which are shear keys. As an example, the filler 60 may be a high-strength fiber-reinforced mortar, but can be appropriately changed.

Next, a connection method for connecting the first precast deck 10 and the second precast deck 20 via the connecting member 30 will be described with reference to FIGS. 5 to 8. First, the first precast deck 10, the second precast deck 20, and the connecting member 30 are prepared (the step of preparing the first precast deck, the second precast deck, and the connecting member). The first precast deck 10, the second precast deck 20, and the connecting member 30 may be manufactured in advance at the factory.

Next, the first precast deck 10, the second precast deck 20, and the connecting member 30 are transported to the site. Then, the first precast deck 10 and the second precast deck 20 are installed by lifting and lowering, and as shown in FIG. 5, the first precast deck 10 is along the bridge axial direction D1. The first end surface 11b of the above and the second end surface 21b of the second precast deck 20 are butted against each other.

At this time, the first precast deck 10 and the second precast deck 20 are arranged so that the first end face 11b and the second end face 21b have an inverted C shape. That is, the first precast deck 10 and the second precast deck 20 are arranged so that the first end face 11b and the second end face 21b both incline in the direction of projecting vertically downward (the first precast deck and the second precast deck 20). Step of arranging the second precast deck).

Further, the projecting members 70 projecting from the first end surface 11b and the second end surface 21b are fixed to the lower surface 11c of the first precast deck 10 and the lower surface 21c of the second precast deck 20 (fixing the projecting members). Process). The projecting member 70 is provided to suppress the sinking of the connecting member 30. The projecting member 70 is, for example, the opposite side of the plate-shaped portion 71 in contact with the lower surfaces 11c and 21c, the screw portion 72 screwed into the plate-shaped portions 71 and the lower surfaces 11c and 21c, and the lower surfaces 11c and 21c of the plate-shaped portions 71. A nut 73 that comes into contact with the screw portion 72 and is tightened to the screw portion 72 is provided.

After the projecting members 70 projecting from the first end surface 11b and the second end surface 21b are fixed to the lower surfaces 11c and 21c, the connecting member 30 is inserted into the joint space T from above. At this time, the connecting member 30 is aligned so that the hole 31c is located above the first reinforcing bar 12 and the second reinforcing bar 22, and then the connecting member 30 is lowered to lower the first reinforcing bar 12 and the second reinforcing bar 22. Each of the above is passed through the hole 31c.

Then, each side plate portion 31 is opposed to each of the first end surface 11b and the second end surface 21b, and the upper surface 32a of the upper plate portion 32 is the upper surface 11a of the first precast deck 10 and the upper surface 21a of the second precast deck 20. The connecting member 30 is arranged so as to be continuous with the above (step of arranging the connecting member).

After arranging the connecting member 30, as shown in FIGS. 6 and 7, a gap K1 between the side plate portion 31 and the first end surface 11b and a gap K2 between the side plate portion 31 and the second end surface 21b The embedded member 40 is embedded in the (step of embedding the embedded member). The embedded member 40 is embedded in the gaps K1 and K2 as needed, and may be unnecessary when the gaps K1 and K2 are sufficiently small, for example.

The embedded member 40 is, for example, a filling member 41 or a shim 42. As an example, the filling member 41 is a non-shrink mortar, and may be a mortar that hardens quickly and exhibits a quick effect. When the filling member 41 is used as the embedding member 40, the gaps K1 and K2 can be quickly closed regardless of the size of the gaps K1 and K2.

The shim 42 is a plate material that fills the gaps K1 and K2. The shim 42 has a hole portion 42a similar to the hole portion 31c of the side plate portion 31, and each of the first reinforcing bar 12 and the second reinforcing bar 22 is passed through the hole portion 42a. The thickness of the shim 42 can be appropriately changed according to the size of the gaps K1 and K2. A plurality of types of shims 42 having different thicknesses may be prepared in advance, and in this case, an appropriate shim 42 can be selected according to the size of the gaps K1 and K2. The number of shims 42 to be embedded in the gaps K1 and K2 may be one or a plurality.

Further, in each side plate portion 31, each of the first reinforcing bar 12 and the second reinforcing bar 22 is tightened by the tightening member 50 (step of tightening by the tightening member). Specifically, each of the first reinforcing bar 12 and the second reinforcing bar 22 is inserted into the washer 51, and the washer 51 is pressed against the inner surface 31b of the side plate portion 31.

Then, the nut 52 is screwed into each of the first reinforcing bar 12 and the second reinforcing bar 22, and the washer 51 and the side plate portion 31 are tightened by screwing the nut 52. At this time, the side plate portion 31 is bent by the fastening force of the nut 52 and pressed against each of the first end surface 11b and the second end surface 21b to become familiar with the first precast deck 10, the connecting member 30, and the second precast deck 20. The structural integrity of the is enhanced.

Through the above steps, the temporary installation of the connecting structure 1 including the first precast deck 10, the connecting member 30, and the second precast deck 20 is completed. That is, as described above, after the structural integrity of the first precast deck 10, the connecting member 30, and the second precast deck 20 has been enhanced, the vehicle can be driven on the temporarily provided connecting structure 1. It will be possible. Since the above temporary work can be completed promptly in, for example, about 3 hours, it is possible to complete the work in the evening and open the road provided with the connecting structure 1 the next day.

Further, the filling material 60 is filled in the region surrounded by the pair of side plate portions 31 and the upper plate portion 32 (step of filling the filler). This filling operation can be performed after the road is opened. In this filling operation, as shown in FIG. 8, the projecting member 70 is removed from the lower surfaces 11c and 21c, and the mold 80 that closes the joint space T is arranged at the position where the projecting member 70 is fixed.

The removed projecting member 70 can be reused. For example, the formwork 80 is fixed to the lower surfaces 11c and 21c by the screw portion 72 and the nut 73 of the projecting member 70 (step of arranging the formwork). After that, the filler 60 is filled in the joint space T, the filler 60 is cured, and the mold 80 is removed, and then the connecting structure 1 shown in FIG. 1 is completed.

Next, the operation and effect of the connection structure 1 and the connection method according to the present embodiment will be described in detail.

In the connection structure 1 and the connection method described above, both the first end surface 11b of the first precast deck 10 and the second end surface 21b of the second precast deck 20 are inclined in a direction in which they protrude vertically downward. ing. That is, the first end surface 11b and the second end surface 21b are inclined so as to protrude vertically downward.

The connecting member 30 passes through the first reinforcing bar 12 and the second reinforcing bar 22 and connects the pair of side plate portions 31 facing each of the first end surface 11b and the second end surface 21b and the upper ends of the pair of side plate portions 31. A plate portion 32 is provided. Since the first end surface 11b, the second end surface 21b, and the pair of side plate portions 31 are all inclined in a direction in which they protrude vertically downward, each side plate portion 31 is inserted when the connecting member 30 is inserted from above. It can be brought close to each of the first end surface 11b and the second end surface 21b.

Therefore, the connecting member 30 can be easily inserted, and the gap K1 between the connecting member 30 and the first end surface 11b and the gap K2 between the connecting member 30 and the second end surface 21b can be reduced. Can be done. Therefore, the connection work can be carried out promptly. Further, even if a force is applied to the connecting member 30 from vertically above, the force can be resisted by the pair of inclined side plate portions 31.

That is, the pair of inclined side plate portions 31 can increase the shear resistance of the first precast deck 10, the second precast deck 20, and the connecting member 30. The durability of the first precast deck 10, the second precast deck 20, and the connecting member 30 can be maintained. Further, since the first end surface 11b, the second end surface 21b, and the side plate portion 31 are inclined, the shear resistance can be increased as described above. It is possible to lower the specifications. That is, it is possible to increase the types of reinforcing bars that can be used as the first reinforcing bar 12 and the second reinforcing bar 22.

Further, in the connecting structure 1 and the connecting method, a filler 60 may be provided to fill the area surrounded by the pair of side plate portions 31 and the upper plate portion 32. In this case, since the filler 60 is placed between the pair of side plate portions 31 and the upper plate portion 32, the durability of the first precast deck slab 10, the second precast deck slab 20, and the connecting member 30 is enhanced. At the same time, the structural integrity of the connecting structure 1 can be enhanced.

Further, in the connecting structure 1 and the connecting method, each of the pair of side plate portions 31 includes a tightening member 50 for tightening each of the first reinforcing bar 12 and the second reinforcing bar 22. Therefore, since the first reinforcing bar 12 and the second reinforcing bar 22 are tightened to each of the pair of side plate portions 31 by the tightening member 50, the first precast floor slab 10, the second precast floor slab 20, and the connecting member 30 are more firmly connected. can do.

Further, in the connecting structure 1 and the connecting method, an embedded member 40 embedded in the gap K1 between the side plate portion 31 and the first end surface 11b and the gap K2 between the side plate portion 31 and the second end surface 21b may be provided. good. In this case, the structural integrity of the first precast deck 10, the second precast deck 20, and the connecting member 30 can be further enhanced.

Further, the connecting structure 1 includes a rib 33 protruding from the lower surface 32b of the upper plate portion 32 and the inner surface 31b of each side plate portion 31. Therefore, the connecting member 30 can be reinforced by the ribs 33 extending from each of the upper plate portion 32 and the pair of side plate portions 31. Therefore, since the strength of the connecting member 30 can be increased, the connection by the connecting member 30 can be further strengthened.

(Second Embodiment)
Next, the connection structure and the connection method according to the second embodiment will be described with reference to FIG. The connecting structure according to the second embodiment is the same as the connecting structure 1 according to the first embodiment, but the formwork 90 used in the connecting method is different from that of the first embodiment. In the following description, the description overlapping with the first embodiment will be omitted as appropriate.

The formwork 90 can be fixed to the first precast deck 10 and the second precast deck 20 without removing the projecting member 70. The mold 90 includes a plate-shaped portion 91 that contacts the lower surface of the plate-shaped portion 71 of each protruding member 70, and a convex portion 92 that protrudes from the plate-shaped portion 91. The convex portion 92 is a portion that fits between the pair of protruding members 70.

When the convex portion 92 is fitted between the pair of protruding members 70 and the plate-shaped portion 91 comes into contact with the plate-shaped portion 71, the upper surface of the convex portion 92 coincides with the upper surface of the plate-shaped portion 71. Further, the screw portion 72 is screwed into the plate-shaped portion 91, the plate-shaped portion 71, and the lower surfaces 11c and 21c. Then, the mold 90 is fixed by screwing the nut 73 into the screw portion 72 and pressing the nut 73 against the lower surface of the plate-shaped portion 91. After fixing the formwork 90 as described above, the construction of the connecting structure 1 is completed by filling the joint space T with the filler 60 and curing the filler 60 in the same manner as described above.

As described above, in the second embodiment, since the connecting member 30 having the pair of inclined side plate portions 31 and the upper plate portion 32 is provided, the same effect as described above can be obtained. Further, in the second embodiment, by placing the filler 60 using the formwork 90, it is not necessary to remove the projecting member 70 from each of the first precast deck 10 and the second precast deck 20. can do. Therefore, it contributes to further efficiency of the connection work.

(Third Embodiment)
Subsequently, the connection structure and the connection method according to the third embodiment will be described with reference to FIG. The connecting structure according to the third embodiment includes a connecting member 100 and a tightening member 110 different from the above-mentioned connecting member 30 and the tightening member 50. The connecting member 100 includes a pair of side plate portions 101 and an upper plate portion 32.

A hole 31c for passing the first reinforcing bar 12 is formed in the side plate portion 101. An uneven portion 101c is provided on the edge of the hole portion 31c on the inner surface 101b of the side plate portion 101. The uneven portion 101c is, for example, a minute uneven portion having a mountain valley shape. The tightening member 110 includes a washer 111 that is pressed against the inner surface 101b and a nut 52. An uneven portion 111a is provided on the contact surface of the washer 111 with the side plate portion 101. Since the uneven portion 111a is a portion for engaging with the uneven portion 101c, it has a minute mountain valley shape like the uneven portion 101c.

In the connecting method according to the third embodiment, in the step of tightening by the tightening member 110, the washer 111 is pressed against the inner surface 101b of the side plate portion 101, and the uneven portion 111a of the washer 111 is meshed with the uneven portion 101c of the side plate portion 101. By engaging the uneven portion 111a with the uneven portion 101c in this way, slippage of the washer 111 with respect to the inner surface 101b is suppressed.

As described above, in the third embodiment, since the connecting member 100 having the pair of inclined side plate portions 101 and the upper plate portion 32 is provided, the same effect as that of each of the above-described embodiments can be obtained. Further, in the third embodiment, since the sliding of the tightening member 110 with respect to the connecting member 100 is suppressed, the tightening member 110 can tighten the tightening member 110 more firmly. Therefore, the structural integrity of the connecting structure can be further enhanced.

Although each embodiment of the connecting structure and the connecting method according to the present invention has been described above, the present invention is not limited to each of the above-described embodiments and is modified without changing the gist described in each claim. You may. That is, the configuration of each element constituting the connection structure and the content and order of each process constituting the connection method can be appropriately changed.

For example, in the above-described embodiment, an example in which the filling member 41 or the shim 42 is used as the embedding member 40 has been described. However, the embedded member is not limited to the filling member 41 or the shim 42, and can be appropriately changed. As the embedding member, for example, both the filling member 41 and the shim 42 may be used.

Further, in the above-described embodiment, an example in which the side plate portion 31 includes a plurality of hole portions 31c has been described, but the shape, size, and arrangement mode of the hole portions can be appropriately changed. Further, the material of the connecting member can be changed as appropriate.

Further, in the above-described embodiment, an example in which the subduction of the connecting member 30 is suppressed by the protruding member 70 including the plate-shaped portion 71, the screw portion 72, and the nut 73 has been described. However, the configuration for suppressing the sinking of the connecting member 30 is not limited to the protruding member 70 and can be appropriately changed.

Further, in the above-described embodiment, the first precast deck 10 including the substantially rectangular parallelepiped first precast block 11 and the first reinforcing bar 12 has been described, but the shape, size and material of the first precast deck have been described. It can be changed as appropriate. The number of first reinforcing bars and the arrangement mode of the first precast deck can be changed as appropriate. Further, the second precast deck can be changed in the same manner as described above.

1 ... Connecting structure, 10 ... First precast deck, 11 ... First precast block, 11a ... Top surface, 11b ... First end face, 11c ... Bottom surface, 12 ... First reinforcing bar, 12a ... Protruding part, 12b ... Buried part, 20 ... 2nd precast floor slab, 21 ... 2nd precast block, 21a ... upper surface, 21b ... second end surface, 21c ... lower surface, 22 ... second reinforcing bar, 22a ... protruding part, 22b ... buried part, 30,100 ... connected Member, 31,101 ... Side plate part, 31a ... Outer surface, 31b, 101b ... Inner surface, 31c ... Hole part, 32 ... Upper plate part, 32a ... Upper surface, 32b ... Lower surface, 33 ... Rib, 40 ... Embedded member, 41 ... Filling Member, 42 ... shim, 42a ... hole, 50, 110 ... tightening member, 51, 111 ... washer, 52 ... nut, 60 ... filler, 70 ... protruding member, 71 ... plate-shaped part, 72 ... threaded part, 73 ... Nut, 80, 90 ... Formwork, 91 ... Plate-shaped part, 92 ... Convex part, 101c, 111a ... Concavo-convex part, D1 ... Bridge axis direction, D2 ... Bridge axis perpendicular direction, D3 ... Vertical direction, K1, K2 ... Gap, S ... vertical surface, T ... joint space, θ1, θ2 ... tilt angle.

Claims (9)

It is a connecting structure in which the first precast floor slab and the second precast floor slab are connected via a connecting member.
The first precast deck includes a first precast block having a first end surface facing the second precast deck, and a first reinforcing bar embedded in the first precast block and protruding from the first end surface. Prepare,
The second precast deck includes a second precast block having a second end surface facing the first end surface, and a second reinforcing bar embedded in the second precast block and protruding from the second end surface.
Both the first end face and the second end face are inclined in a direction in which they protrude from each other as they go vertically downward.
The connecting member
A pair of side plate portions facing each of the first end surface and the second end surface and having holes through which the first reinforcing bar and the second reinforcing bar are passed.
The pair of side plates are connected to each other and have an upper surface of the first precast deck and an upper plate provided so as to be continuous with the upper surface of the second precast deck.
Connected structure. A filler is provided to fill a region surrounded by the pair of side plate portions and the upper plate portion.
The connected structure according to claim 1. Each of the pair of side plate portions includes a tightening member for tightening each of the first reinforcing bar and the second reinforcing bar.
The connected structure according to claim 1 or 2. An embedding member to be embedded in a gap between the side plate portion and the first end surface and a gap between the side plate portion and the second end surface is provided.
The connected structure according to any one of claims 1 to 3. A rib protruding from the lower surface of the upper plate portion and the inner surface of each of the side plate portions is provided.
The connected structure according to any one of claims 1 to 4. It is a connecting method in which the first precast floor slab and the second precast floor slab are connected via a connecting member.
The first precast deck includes a first precast block having a first end surface facing the second precast deck, and a first reinforcing bar embedded in the first precast block and protruding from the first end surface. Prepare,
The second precast deck includes a second precast block having a second end surface facing the first end surface, and a second reinforcing bar embedded in the second precast block and protruding from the second end surface.
Both the first end surface and the second end surface are inclined surfaces that incline in a direction in which they protrude from each other as they go vertically downward.
By abutting the first end face and the second end face along the bridge axis direction, the first end face and the second end face are both inclined in a direction in which they protrude vertically downward. 1 step of arranging the precast deck and the second precast deck, and
Each of the pair of side plate portions of the connecting member is made to face each of the first end surface and the second end surface, and each of the first reinforcing bar and the second reinforcing bar is passed through the hole portion of the side plate portion to pass the connecting member. A step of arranging the connecting member so that the upper plate portion is continuous with the upper surface of the first precast deck and the upper surface of the second precast deck.
A connection method comprising. A step of filling a region surrounded by the pair of side plate portions and the upper plate portion with a filler is provided.
The connection method according to claim 6. Each of the pair of side plate portions includes a step of tightening each of the first reinforcing bar and the second reinforcing bar by a tightening member.
The connection method according to claim 6 or 7. A step of embedding an embedding member in a gap between the side plate portion and the first end surface and a gap between the side plate portion and the second end surface is provided.
The connection method according to any one of claims 6 to 8.

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