Joint structure for girder and floor slab and method for joining girder and floor slab

Abstract

To provide a joint structure for a girder and a floor slab, and a method for joining a girder and a floor slab which can prevent interference with existing reinforcing bars and other components.SOLUTION: A joint structure for a girder and a floor slab comprises a girder 2, a precast floor slab 3 supported by the girder 2, and joining means 4 for joining the girder 2 and the precast floor slab 3, and the joining means 4 includes a girder-side joining part 40 having a steel pipe 41 fixed to the girder 2 and arranged with an axis line oriented vertically, a joining hole 33 formed vertically penetrating the precast floor slab 3, a floor slab-side joining part 50 provided on the girder-side joining part 40 and inserted into the joining hole 33, and a filling part 60 that fills the joining hole 33 and in which the floor slab-side joining part 50 is embedded.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a joint structure between a girder and a deck slab, and a method for joining a girder and a deck slab. [Background technology]

[0002] The reinforced concrete deck slabs of bridges deteriorate over the decades since they began operation and must be replaced. When replacing a deck slab, the deteriorated deck is cut horizontally and the joint surface is chipped away with a water jet. Next, as shown in Figure 20, post-installed anchor bolts 102 and other bolts are fixed to the joint surface of the existing concrete girder 101, and a new deck slab 103 is installed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6845457 Summary of the Invention [Problem to be solved by the invention]

[0004] When embedding anchor bolts 102 for preventing shear in precast girder 101, the anchor bolts 102 must be embedded in positions that do not interfere with the prestressing steel members or reinforcing bars inside the precast girder 101. Also, in bridges that were built older, some have anchoring parts for the prestressing steel members near the top surface of the precast girder 101, and since consideration of the placement of the anchor bolts 102 must resolve these constraints, a lot of effort is required for consideration of placement at the time of design. Furthermore, even if the anchor bolts 102 can be placed on the design drawings, the prestressing steel members and reinforcing bars in the actual structure may not be placed according to the drawings, which can cause the anchor bolts 102 to interfere.

[0005] Therefore, the present invention has been made in consideration of the above circumstances, and provides a joint structure between a girder and a deck slab that can suppress interference with the reinforcing bars, etc. of existing precast girders, and a method for joining a girder and a deck slab. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention employs the following means. In other words, the joint structure between a girder and a deck slab of the present invention comprises a girder made of reinforced concrete or prestressed concrete, a precast deck slab supported by the girder, and a joint means for joining the girder and the precast deck slab, the joint means comprising a girder-side joint having a steel pipe fixed to the girder and arranged with its axis facing in the vertical direction, a joint hole formed in the precast deck slab so as to penetrate in the vertical direction, a deck-side joint provided in the girder-side joint and inserted into the joint hole, and a filling portion filled in the joint hole and in which the deck-side joint is embedded.

[0007] In the joint structure between the girder and the deck slab configured in this manner, a girder-side joint having a steel pipe is fixed to the girder. The deck slab-side joint provided in the girder-side joint is embedded in the filling portion filled in the joint hole of the precast deck slab, thereby fixing the deck slab-side joint to the precast deck slab. The deck slab-side joint prevents the precast deck slab from shifting. The steel pipe of the girder-side joint only needs to be embedded to the extent that it fits within the girder's cover, which prevents interference between the steel pipe and the reinforcing bars of the existing girder.

[0008] In addition, the joint structure between a girder and a deck slab according to the present invention may have a ring-shaped groove formed in the girder that is recessed downward from the upper surface, and the steel pipe may be fixed in the groove.

[0009] In this joint structure between the girder and the deck slab, an annular groove recessed downward from the top surface is formed in the girder, and the steel pipe is fixed in the groove, which makes it easy to fix the steel pipe to the girder.

[0010] In the joint structure between a girder and a deck slab according to the present invention, the deck slab side joint portion may be the steel pipe protruding upward from the girder.

[0011] In this joint structure between the girder and the deck slab, the deck-side joint is a steel pipe protruding upward from the girder. Because the steel pipe serves as both the girder-side joint and the deck-side joint, the girder-side joint and the deck-side joint can be constructed at the same time, making construction easier.

[0012] In addition, in the joint structure between a girder and a deck slab according to the present invention, the deck slab side joint may be another steel pipe arranged with its axis facing in the vertical direction and joined to the steel pipe.

[0013] In this joint structure between a girder and a deck slab, by joining another steel pipe to the steel pipe of the girder-side joint fixed to the girder, the other steel pipe of the deck slab-side joint is integrated with the steel pipe of the girder-side joint. Therefore, the other steel pipe of the deck slab-side joint can be easily connected to the steel pipe of the girder-side joint.

[0014] In addition, in the joint structure between a girder and a deck slab according to the present invention, the other steel pipe of the deck slab side joint may be screwed to the steel pipe of the girder side joint.

[0015] In this joint structure between a girder and a deck slab, by joining another steel pipe to the steel pipe of the girder-side joint fixed to the girder, the other steel pipe of the deck slab-side joint is integrated with the steel pipe of the girder-side joint. This makes it easier to connect the other steel pipe of the deck slab-side joint to the steel pipe of the girder-side joint.

[0016] In addition, in the joint structure between a girder and a deck slab according to the present invention, the deck slab side joint portion may have a stud dowel fixed to the girder side joint portion.

[0017] In this joint structure between the girder and deck slab, the deck-side joint is a stud dowel fixed to the steel pipe. Therefore, once the steel pipe is fixed to the girder, the stud dowel is also installed, making the deck-side joint easy to install.

[0018] In addition, in the joint structure between a girder and a deck slab according to the present invention, the stud dowel may be arranged to extend upward from an upper plate arranged to close the upper part of the steel pipe.

[0019] In this joint structure between the girder and the deck, the stud dowels extend upward from the upper plate that closes the top of the steel pipe. By adjusting the number and placement of the stud dowels, it is possible to appropriately resist the shear force of the precast deck.

[0020] In addition, in the joint structure between a girder and a deck slab according to the present invention, the outer edge of the upper plate may protrude radially outward beyond the steel pipe.

[0021] In this joint structure between the girder and the deck, the outer edge of the upper plate that closes the top of the steel pipe extends radially outward beyond the steel pipe. Therefore, by increasing the size of the upper plate, the number of stud dowels can be increased, which increases the resistance to shear forces of the precast deck.

[0022] In the joining structure between a girder and a deck slab according to the present invention, the stud dowel may be fixed to the outer peripheral surface of the steel pipe.

[0023] In the joint structure between the girder and the deck slab configured in this manner, the stud dowels are fixed to the outer circumferential surface of the steel pipe, so the stud dowels can be provided at any position on the outer circumferential surface of the steel pipe.

[0024] In the joining structure between a girder and a deck slab according to the present invention, the stud dowel may be fixed to the inner peripheral surface of the steel pipe.

[0025] In the joint structure between the girder and the deck slab configured in this manner, the stud dowel is fixed to the inner peripheral surface of the steel pipe, so the stud dowel can be provided at any position on the inner peripheral surface of the steel pipe.

[0026] In addition, in the joint structure between a girder and a deck slab according to the present invention, the girder-side joint may have a fixing plate fixed to the steel pipe and arranged along the upper surface of the girder, and the fixing plate may be fixed to the girder by a fastener.

[0027] In this joint structure between the girder and the deck slab, the fixing plate of the girder-side joint is fixed to the steel pipe, placed along the top surface of the girder, and fixed to the girder with fasteners, allowing the steel pipe to be more firmly fixed to the girder.

[0028] In addition, the method of joining a girder and a deck slab according to the present invention comprises a groove forming step of forming a ring-shaped groove recessed downward from the top surface of the girder; a girder-side joint fixing step of arranging a steel pipe of the girder-side joint in the groove so that its axis faces in the vertical direction and fixing the steel pipe to the groove; a precast deck installation step of installing the precast deck slab above the girder so that the deck-side joint provided on the girder-side joint is inserted into a joint hole formed in the precast deck slab in the vertical direction; and a deck-side joint fixing step of filling the joint hole with a filling part to bury the deck-side joint.

[0029] In the method for joining a girder and a deck slab configured in this manner, a groove forming process forms a ring-shaped groove that is recessed downward from the top surface of the girder. In the girder-side joint fixing process, the steel pipe of the girder-side joint is placed in the groove and fixed to the groove. In the precast deck slab installation process, the precast deck slab is installed on top of the girder so that the deck-side joint is inserted into the joint hole in the precast deck slab. In the deck-side joint fixing process, the joint hole is filled with a filling material to bury the deck-side joint. The deck-side joint prevents the precast deck slab from shifting. The steel pipe of the girder-side joint only needs to be buried to the extent that it fits within the girder's cover, which prevents interference between the steel pipe and the reinforcing bars of the existing girder. [Effects of the Invention]

[0030] According to the joint structure between a girder and a deck slab and the joint method between a girder and a deck slab of the present invention, interference with reinforcing bars of existing girders can be suppressed. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a vertical cross-sectional view showing a joint structure between a girder and a deck slab according to a first embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view of part II in FIG. [Figure 3] FIG. [Figure 4] 1A to 1C are diagrams showing a method for joining a girder and a deck slab according to a first embodiment of the present invention. [Figure 5] 4A to 4C are diagrams illustrating a method for joining a girder and a deck slab according to the first embodiment of the present invention, showing a step of fixing a girder-side joint. [Figure 6] 1A to 1C are diagrams showing a method for joining a girder and a deck slab according to a first embodiment of the present invention, illustrating a precast deck slab installation process. [Figure 7] 4A to 4C are diagrams illustrating a method for joining a girder and a deck slab according to the first embodiment of the present invention, showing a deck slab-side joint fixing step. [Figure 8] FIG. 6 is an enlarged view of a main portion of a vertical cross-sectional view showing a joint structure between a girder and a deck slab according to a second embodiment of the present invention. [Figure 9] FIG. 10 is an enlarged view of a main portion of a vertical cross-sectional view showing a joint structure between a girder and a deck slab according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a perspective view of a girder-side joint portion and a deck-side joint portion of a joint structure between a girder and a deck according to a third embodiment of the present invention. [Figure 11] FIG. 10 is an enlarged view of a main portion of a vertical cross-sectional view showing a joint structure between a girder and a deck slab according to a fourth embodiment of the present invention. [Figure 12] FIG. 10 is a perspective view of a girder-side joint and a deck-side joint of a joint structure between a girder and a deck according to a fourth embodiment of the present invention. [Figure 13] FIG. 10 is an enlarged view of a main portion of a vertical cross-sectional view showing a joint structure between a girder and a deck slab according to a fifth embodiment of the present invention. [Figure 14] FIG. 10 is a perspective view of a girder-side joint and a deck-side joint of a joint structure between a girder and a deck according to a fifth embodiment of the present invention. [Figure 15] FIG. 13 is a perspective view of a girder-side joint portion and a deck-side joint portion of a joint structure between a girder and a deck slab according to a sixth embodiment of the present invention. [Figure 16] FIG. 13 is an enlarged view of a main portion of a vertical cross-sectional view showing a joint structure between a girder and a deck slab according to a seventh embodiment of the present invention. [Figure 17] FIG. 13 is a plan view of a girder-side joint and a deck-side joint of a joint structure between a girder and a deck according to a seventh embodiment of the present invention. [Figure 18] FIG. 13 is a plan view of a girder-side joint and a deck-slab-side joint of a joint structure between a girder and a deck slab according to a first modified example of the seventh embodiment of the present invention. [Figure 19] FIG. 20 is a plan view of a girder-side joint and a deck-side joint of a joint structure between a girder and a deck according to a second modified example of the seventh embodiment of the present invention. [Figure 20] FIG. 1 is a vertical cross-sectional view showing a conventional method for joining a precast girder and a precast deck. DETAILED DESCRIPTION OF THE INVENTION

[0032] (First embodiment) Hereinafter, a joining structure between a girder and a deck slab and a joining method between a girder and a deck slab according to an embodiment of the present invention will be described with reference to the drawings. First, the joint structure between the girder and the deck will be described. FIG. 1 is a vertical cross-sectional view showing a joint structure between a girder and a deck slab according to a first embodiment of the present invention. As shown in Figure 1, the girder-to-deck slab joint structure 1 according to this embodiment comprises an existing girder 2, a precast deck 3, and joint means 4. The girder-to-deck slab joint structure 1 is formed by removing the precast deck slab due to deterioration over time or the like, and installing and fixing a new precast deck slab 3 to the existing girder 2. Note that the girder-to-deck slab joint structure 1 can also be appropriately configured to install and fix a new precast deck slab 3 to a new existing girder 2.

[0033] The existing girder 2 is an existing component that has been installed since before replacement. The existing girder 2 is a component made of reinforced concrete or prestressed concrete. The existing girder 2 has a well-known configuration in which reinforcing bars and PC steel members (not shown) are embedded in concrete 21. The existing girder 2 has a web 24 formed between an upper flange 22 and a lower flange 23. The existing girder 2 is formed in a roughly I-shape in a cross section perpendicular to the longitudinal direction.

[0034] The precast deck 3 is a new component installed after the replacement. It is supported by the existing girder 2. The precast deck 3 is placed above the existing girder 2. The precast deck 3 is made of precast concrete. The precast deck 3 has a well-known configuration in which reinforcing bars and the like (not shown) are embedded in concrete 31.

[0035] The precast deck 3 is formed in a plate shape. The plate surface of the precast deck 3 faces the vertical direction. The portion 3a of the precast deck 3 that will be installed on the existing girder 2 bulges downward to increase the plate thickness. The plate thickness of the precast deck 3 may be constant.

[0036] The joint means 4 joins the existing girder 2 and the precast deck slab 3. The joint means 4 has a girder-side joint portion 40, a joint hole 33, a deck-side joint portion 50, and a filling portion 60.

[0037] Fig. 2 is an enlarged view of part II in Fig. 1. Fig. 3 is a perspective view of a steel pipe 41. As shown in Fig. 2, the girder-side joint 40 has a steel pipe 41. As shown in Fig. 3, the steel pipe 41 is formed in a cylindrical shape. Note that the steel pipe 41 may be formed in a cylindrical shape with a rectangular cross section, and the cross-sectional shape can be set appropriately.

[0038] As shown in Figure 2, a groove 26 recessed downward from the upper surface 22a is formed in the upper flange 22 of the existing girder 2. The groove 26 is formed in a ring shape when viewed from above. The cross-sectional shape of the groove 26 is slightly larger than the cross-sectional shape of the steel pipe 41.

[0039] At least the lower part of the steel pipe 41 is disposed in the groove 26. A portion of the steel pipe 41, including the upper end 41a, protrudes upward from the groove 26. The steel pipe 41 is disposed with its axis facing up and down. An adhesive 27, such as an epoxy resin adhesive, is provided between the groove 26 and the steel pipe 41. The adhesive 27 fixes the steel pipe 41 to the groove 26 of the existing girder 2. The height at which the steel pipe 41 is embedded in the groove 26 is approximately 30 mm, as long as it is equal to or less than the cover thickness of the concrete 21. The groove 26 may be disposed at a position that does not interfere with reinforcing bars, PC steel members, etc. embedded in the concrete 21, and may be deeper than the cover thickness. If the horizontal shear force of the precast deck 3 against the existing girder 2 is large, this can be adjusted by increasing the diameter of the steel pipe 41, increasing the thickness of the steel pipe 41, or increasing the number of steel pipes 41.

[0040] The joint holes 33 are formed to penetrate the precast deck 3 in the vertical direction. The joint holes 33 have, for example, a circular or oval shape. In the illustrated example, one steel pipe 41 is inserted into one joint hole 33. Note that two or more steel pipes 41 may be inserted into one joint hole 33.

[0041] The deck slab-side joint 50 is a portion of the steel pipe 41 that protrudes upward from the groove portion 26. In this embodiment, the lower portion of the steel pipe 41 functions as the girder-side joint 40, and the upper portion of the steel pipe 41 functions as the deck slab-side joint 50. In other words, the girder-side joint 40 and the deck slab-side joint 50 are constructed from the same member.

[0042] The filling portion 60 is a filling material such as concrete filled into the joint holes 33 of the precast deck 3. The portion of the steel pipe 41 that protrudes upward from the groove 26, i.e., the deck-side joint portion 50, is buried and fixed in the filling portion 60. The inside of the steel pipe 41 is also filled with the filling portion 60.

[0043] Next, the method for joining the girder and the deck slab will be explained. Fig. 4 is a diagram showing a method for joining a girder and a deck slab according to the first embodiment of the present invention. Fig. 5 is a diagram showing a method for joining a girder and a deck slab according to the first embodiment of the present invention, showing the girder-side joint fixing step. Fig. 6 is a diagram showing a method for joining a girder and a deck slab according to the first embodiment of the present invention, showing the precast deck slab installation step. Fig. 7 is a diagram showing a method for joining a girder and a deck slab according to the first embodiment of the present invention, showing the deck slab-side joint fixing step. As shown in Figure 4, when replacing a precast deck, the existing precast deck and the connecting rebars connecting the precast deck 3 to the existing precast deck are cut with a device such as a wire saw, and the existing precast deck is removed.

[0044] A groove forming step is carried out. As shown in FIG. 5, the concrete 21 of the existing girder 2 is scraped away using a tool such as a core drill to form an annular groove 26 recessed downward from the upper surface 22a.

[0045] The girder side joint fixing process is carried out. An adhesive 27 is applied to the groove 26, and a steel pipe 41 is installed. The lower part of the steel pipe 41 is fixed to the groove 26. A girder-side joint 40 is constructed.

[0046] The precast deck installation process will be carried out. As shown in Figure 6, connection holes 33 are formed in the precast deck 3 at a factory or the like. The precast deck 3 is installed above the existing girder 2 so that the upper part of the steel pipe 41 passes through the connection hole 33 in the precast deck 3.

[0047] The deck side joint fixing process is carried out. As shown in Fig. 7, concrete is filled into the joint holes 33 of the precast deck slab 3 to form filled sections 60. The upper parts of the steel pipes 41 are fixed in the filled sections 60. The deck-side joint sections 50 are constructed.

[0048] In the girder-to-deck slab joining structure 1 and girder-to-deck slab joining method configured in this manner, a girder-side joint 40 having a steel pipe 41 is fixed to the existing girder 2. The slab-side joint 50 is fixed to the precast slab 3 by being embedded in a filling portion 60 filled in the joint hole 33 of the precast slab 3. The slab-side joint 50 suppresses shifting of the precast slab 3. The steel pipe 41 of the girder-side joint 40 only needs to be embedded to the extent that it fits within the cover portion of the existing girder 2, which suppresses interference between the steel pipe 41 and the reinforcing bars of the existing girder 2.

[0049] Furthermore, an annular groove 26 recessed downward from the upper surface 22a is formed in the existing girder 2, and the steel pipe 41 is fixed in the groove 26. Therefore, the steel pipe 41 can be easily fixed to the existing girder 2.

[0050] In addition, the deck slab-side joint 50 is a steel pipe 41 protruding upward from the existing girder 2. Because the steel pipe 41 serves as both the girder-side joint 40 and the deck slab-side joint 50, the girder-side joint 40 and the deck slab-side joint 50 can be constructed at the same time, improving workability.

[0051] Furthermore, the steel pipe 41 has a larger bearing area of ​​concrete against shear force compared to conventional anchor bolts, which reduces the number of components and shortens the process.

[0052] Compared to the conventional method of embedding a large number of anchor bolts, this method requires a smaller installation area for the steel pipes 41. Therefore, the area required to form the connection holes 33 in the precast deck 3 is smaller, which reduces the area of ​​the filled sections 60, which are structurally weak points and are subsequently filled. In addition, it is possible to reduce interference with PC steel beams and reinforcing bars that occurs when embedding a large number of anchor bolts in the conventional method.

[0053] (Second embodiment) Next, a second embodiment will be described mainly with reference to Fig. 8. The same or similar members and parts as those in the above-described embodiment will be designated by the same reference numerals, and the description will be omitted, and only the configurations different from the embodiment will be described.

[0054] FIG. 8 is an enlarged view of a main part of a vertical cross section showing a joint structure between a girder and a deck slab according to a second embodiment of the present invention. As shown in FIG. 8, the girder-side joint 40A has a steel pipe 41A. The steel pipe 41A is formed in a cylindrical shape. The steel pipe 41A is placed in the groove 26. The steel pipe 41A is fixed to the groove 26 by an adhesive 27.

[0055] The steel pipe 41A has a thread 42 formed on the outer peripheral surface of the upper part thereof. The thread 42 may also be formed on the inner peripheral surface of the upper part thereof.

[0056] The deck-side joint 50A has a steel pipe 51A. The steel pipe 51A is formed in a cylindrical shape. A screw 52 is formed on the inner peripheral surface of the lower part of the steel pipe 51A. The screw 52 of the steel pipe 51A is threadedly engaged with the screw 42 of the steel pipe 41A. When the screw 42 is formed on the inner peripheral surface of the steel pipe 41A, it is sufficient that the screw 52 is formed on the outer peripheral surface of the steel pipe 51A and the screw 42 and the screw 52 are threadedly engaged with each other.

[0057] Steel pipe 41A and steel pipe 51A are screwed together to form a single tubular member 43. The portion of tubular member 43 that is fixed to groove portion 26 of existing girder 2 functions as girder-side joint portion 40A. The portion of tubular member 43 that is fixed to filling portion 60 that is filled in joint hole 33 of precast deck slab 3 functions as deck-side joint portion 50A. The vertical height at which steel pipe 41A and steel pipe 51A are screwed together may be around the top surface 22a of existing girder 2 as in the illustrated example, or may be higher than the top surface 22a.

[0058] In the girder-to-deck slab joint structure 1 configured in this manner, a girder-side joint 40A having a steel pipe 41A is fixed to the existing girder 2. The slab-side joint 50A is fixed to the precast deck slab 3 by being embedded in a filling portion 60 filled in the joint hole 33 of the precast deck slab 3. The slab-side joint 50A suppresses shifting of the precast deck slab 3. The steel pipe 41A of the girder-side joint 40A only needs to be embedded to the extent that it fits within the cover portion of the existing girder 2, thereby suppressing interference between the steel pipe 41A and the reinforcing bars of the existing girder 2.

[0059] Furthermore, by screwing the steel pipe 51A to the steel pipe 41A fixed to the existing girder 2, the steel pipe 51A is integrated with the steel pipe 41. Therefore, the steel pipe 51A at the deck slab-side joint 50 can be easily connected to the steel pipe 41 at the girder-side joint 40A. The method of joining the steel pipe 41A to the steel pipe 51A may be a method other than screwing, such as fitting, bolting, or welding.

[0060] (Third embodiment) Next, a third embodiment will be described mainly with reference to Figures 9 and 10. The same or similar members and parts as those in the above-described embodiment will be designated by the same reference numerals, and the description will be omitted, and only the configurations different from the embodiment will be described.

[0061] Fig. 9 is an enlarged view of a main part of a vertical cross-sectional view showing a joint structure between a girder and a deck slab according to a third embodiment of the present invention. Fig. 10 is a perspective view of a girder-side joint portion and a deck slab-side joint portion of the joint structure between a girder and a deck slab according to the third embodiment of the present invention. As shown in FIG. 9 , the girder-side joint 40B has a steel pipe 41B. The steel pipe 41B is formed in a cylindrical shape. The steel pipe 41B is placed in the groove 26. The steel pipe 41B is fixed to the groove 26 by an adhesive 27.

[0062] As shown in Figure 10, an upper plate 44 is provided on the upper part of the steel pipe 41B. The upper plate 44 is formed in a plate shape. The plate surface of the upper plate 44 faces the vertical direction. The shape of the upper plate 44 is a circle that is approximately the same as the shape of the outer periphery of the steel pipe 41B. The upper part of the steel pipe 41B is arranged at approximately the same height as the upper surface 22a of the existing girder 2. Note that the upper part of the steel pipe 41B may be arranged above the upper surface 22a of the existing girder 2, or below the upper surface 22a of the existing girder 2. The upper plate 44 may be provided at the middle or lower part of the steel pipe 41B in the vertical direction. Alternatively, it may be configured to completely block the inside of the steel pipe 41B.

[0063] The deck slab side joint 50B has a stud dowel 53. The lower end of the stud dowel 53 is fixed to the upper plate 44. The stud dowel 53 extends upward from the upper plate 44. In the illustrated example, two stud dowels 53 are arranged apart in the diameter direction of the upper plate 44, but the number and arrangement positions of the stud dowels 53 can be set appropriately. As shown in Figure 9, the stud dowel 53 is embedded and fixed in the filling portion 60.

[0064] In the girder-to-deck slab joint structure 1 configured in this manner, a girder-side joint 40B having a steel pipe 41B is fixed to the existing girder 2. The slab-side joint 50B is fixed to the precast deck slab 3 by being buried in a filling portion 60 filled in the joint hole 33 of the precast deck slab 3. The slab-side joint 50B suppresses shifting of the precast deck slab 3. The steel pipe 41B of the girder-side joint 40B only needs to be buried to the extent that it fits within the cover portion of the existing girder 2, which makes it possible to suppress interference between the steel pipe 41B and the reinforcing bars of the existing girder 2.

[0065] Furthermore, the deck slab side joint 50B is a stud dowel 53 fixed to the steel pipe 41B. Therefore, by fixing the steel pipe 41B to the existing girder 2, the stud dowel 53 is also installed, so the deck slab side joint 50B is easy to install.

[0066] The stud dowels 53 are provided to extend upward from the upper plate 44 that closes the upper part of the steel pipe 41. Therefore, by adjusting the number and arrangement positions of the stud dowels 53, it is possible to appropriately resist the shear force of the precast deck slab 3.

[0067] (Fourth embodiment) Next, a fourth embodiment will be described mainly with reference to Figures 11 and 12. The same or similar members and parts as those in the above-described embodiment will be designated by the same reference numerals, and the description will be omitted, and only the configurations different from the above-described embodiment will be described.

[0068] Fig. 11 is an enlarged view of a main part of a vertical cross section showing a joint structure between a girder and a deck slab according to a fourth embodiment of the present invention. Fig. 12 is a perspective view of a girder-side joint portion and a deck slab-side joint portion of the joint structure between a girder and a deck slab according to the fourth embodiment of the present invention. 11 and 12, an upper plate 44C is provided on the upper part of the steel pipe 41B of the girder-side joint 40C. The upper plate 44C has a circular shape that is larger than the outer periphery of the steel pipe 41B. The outer edge of the upper plate 44C protrudes radially outward beyond the steel pipe 41B.

[0069] The lower ends of the stud dowels 53 of the deck slab-side joint 50C are fixed to the upper plate 44. The stud dowels 53 extend upward from the upper plate 44. In the illustrated example, six stud dowels 53 are arranged at intervals along the outer edge of the upper plate 44, but the number and positions of the stud dowels 53 can be set as appropriate. As shown in Figure 11, the stud dowels 53 are embedded in and fixed to the filling portion 60.

[0070] In the girder-to-deck slab joint structure 1 configured in this manner, a girder-side joint 40B having a steel pipe 41B is fixed to the existing girder 2. The deck-side joint 50C is fixed to the precast deck slab 3 by being buried in a filling portion 60 filled in the joint hole 33 of the precast deck slab 3. The deck-side joint 50C suppresses shifting of the precast deck slab 3. The steel pipe 41B of the girder-side joint 40B only needs to be buried to the extent that it fits within the cover portion of the existing girder 2, which suppresses interference between the steel pipe 41B and the reinforcing bars of the existing girder 2.

[0071] Additionally, the outer edge of the upper plate 44C that closes the upper part of the steel pipe 41B protrudes radially outward beyond the steel pipe 41B. Therefore, by making the upper plate 44C larger, the number of stud dowels 53 can be increased, and the resistance to the shear force of the precast deck 3 can be increased.

[0072] (Fifth embodiment) Next, a fifth embodiment will be described mainly with reference to Figures 13 and 14. The same or similar members and parts as those in the above-described embodiments will be designated by the same reference numerals, and the description will be omitted, and only the configurations different from the above-described embodiments will be described.

[0073] Fig. 13 is an enlarged view of a main part of a vertical cross-sectional view showing a joint structure between a girder and a deck slab according to a fifth embodiment of the present invention. Fig. 14 is a perspective view of a girder-side joint portion and a deck slab-side joint portion of the joint structure between a girder and a deck slab according to the fifth embodiment of the present invention. As shown in FIG. 13, the girder-side joint 40D has a steel pipe 41D. The steel pipe 41D is formed in a cylindrical shape. The steel pipe 41D is placed in the groove 26. The steel pipe 41D is fixed to the groove 26 with adhesive 27. The upper part of the steel pipe 41D is placed above the upper surface 22a of the existing girder 2. The height position of the upper part of the steel pipe 41D can be set as appropriate.

[0074] As shown in Figure 14, the deck slab side joint 50D has a stud dowel 53. The stud dowel 53 is fixed to the outer peripheral surface 45 of the steel pipe 41D. The stud dowel 53 extends upward from the outer peripheral surface 45 of the steel pipe 41D. The upper end of the stud dowel 53 extends upward above the upper part of the steel pipe 41D. In the illustrated example, six stud dowels 53 are arranged circumferentially spaced apart on the outer peripheral surface 45 of the steel pipe 41D, but the number and arrangement positions of the stud dowels 53 can be set appropriately. As shown in Figure 13, the stud dowel 53 is embedded and fixed in the filling portion 60.

[0075] In the girder-to-deck slab joint structure 1 configured in this manner, a girder-side joint 40D having a steel pipe 41D is fixed to the existing girder 2. The slab-side joint 50D is fixed to the precast deck slab 3 by being embedded in a filling portion 60 filled in the joint hole 33 of the precast deck slab 3. The slab-side joint 50D suppresses shifting of the precast deck slab 3. The steel pipe 41D of the girder-side joint 40D only needs to be embedded to the extent that it fits within the cover portion of the existing girder 2, thereby suppressing interference between the steel pipe 41D and the reinforcing bars of the existing girder 2.

[0076] Furthermore, the stud dowel 53 is fixed to the outer peripheral surface 45 of the steel pipe 41D. Therefore, the stud dowel 53 can be provided at any position on the outer peripheral surface 45 of the steel pipe 41D.

[0077] (Sixth embodiment) Next, a sixth embodiment will be described mainly with reference to Fig. 15. The same or similar members and parts as those in the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted, and only the configurations different from the above-described embodiments will be described.

[0078] FIG. 15 is a perspective view of a girder-side joint portion and a deck-slab-side joint portion of a joint structure between a girder and a deck slab according to a sixth embodiment of the present invention. As shown in Figure 15, the stud dowels 53 of the deck slab side joint 50D are fixed to the inner circumferential surface 46 of the steel pipe 41D. The stud dowels 53 extend upward from the inner circumferential surface 46 of the steel pipe 41D. The upper ends of the stud dowels 53 extend upward above the upper part of the steel pipe 41D. In the illustrated example, six stud dowels 53 are arranged circumferentially spaced apart on the inner circumferential surface 46 of the steel pipe 41D, but the number and arrangement positions of the stud dowels 53 can be set as appropriate. The stud dowels 53 are embedded and fixed in the filling portion 60.

[0079] In the girder-to-deck slab joint structure 1 configured in this manner, a girder-side joint 40D having a steel pipe 41D is fixed to the existing girder 2. The slab-side joint 50D is fixed to the precast deck slab 3 by being embedded in a filling portion 60 filled in the joint hole 33 of the precast deck slab 3. The slab-side joint 50D suppresses shifting of the precast deck slab 3. The steel pipe 41D of the girder-side joint 40D only needs to be embedded to the extent that it fits within the cover portion of the existing girder 2, thereby suppressing interference between the steel pipe 41D and the reinforcing bars of the existing girder 2.

[0080] Furthermore, the stud dowel 53 is fixed to the inner peripheral surface 46 of the steel pipe 41D. Therefore, the stud dowel 53 can be provided at any position on the inner peripheral surface 46 of the steel pipe 41D.

[0081] (Seventh embodiment) Next, the seventh embodiment will be described mainly with reference to Figures 16 and 17. The same or similar members and parts as those in the above-described embodiment will be designated by the same reference numerals, and the description will be omitted, and only the configurations different from the above-described embodiment will be described.

[0082] Fig. 16 is an enlarged view of a main part of a vertical cross section showing a joint structure between a girder and a deck slab according to a seventh embodiment of the present invention. Fig. 17 is a plan view of a girder-side joint portion and a deck slab-side joint portion of the joint structure between a girder and a deck slab according to the seventh embodiment of the present invention. As shown in Fig. 16, the girder-side joint 40E has a steel pipe 41 and two fixing plates 47. The fixing plates 47 are fixed to the steel pipe 41. The fixing plates 47 are provided on both radial sides of the steel pipe 41.

[0083] The fixing plate 47 is disposed along the upper surface 22a of the existing girder 2. As shown in FIG. 17 , the fixing plate 47 is fixed to the upper surface 22a of the existing girder 2 by fasteners 48.

[0084] In the girder-to-deck slab joint structure 1 configured in this manner, a girder-side joint 40E having a steel pipe 41 is fixed to the existing girder 2. The slab-side joint 50 is fixed to the precast deck slab 3 by being embedded in a filling portion 60 filled in the joint hole 33 of the precast deck slab 3. The slab-side joint 50 suppresses shifting of the precast deck slab 3. The steel pipe 41 of the girder-side joint 40E only needs to be embedded to the extent that it fits within the cover portion of the existing girder 2, which makes it possible to suppress interference between the steel pipe 41 and the reinforcing bars of the existing girder 2.

[0085] Furthermore, the fixing plate 47 of the girder-side joint 40E is fixed to the steel pipe 41, placed along the upper surface 22a of the existing girder 2, and fixed to the existing girder 2 by fasteners 48. The steel pipe 41 can be more firmly fixed to the existing girder 2.

[0086] (Modification 1 of the seventh embodiment) Next, a first modified example of the seventh embodiment will be described mainly with reference to Fig. 18. The same or similar members and parts as those in the above-described embodiment will be designated by the same reference numerals, and the description will be omitted, and only the configurations different from the embodiment will be described.

[0087] FIG. 18 is a plan view of a girder-side joint portion and a deck-slab-side joint portion of a joint structure between a girder and a deck slab according to Modification 1 of the seventh embodiment of the present invention. 18, the fixing plate 47F of the girder-side joint 40F is provided in an annular shape along the outer peripheral surface 45 of the steel pipe 41. The fixing plate 47F is formed over substantially the entire length of the outer peripheral surface 45 of the steel pipe 41.

[0088] In the girder-to-deck slab joint structure 1 configured in this manner, a girder-side joint 40F having a steel pipe 41 is fixed to the existing girder 2. The slab-side joint 50 is fixed to the precast deck slab 3 by being buried in a filling portion 60 filled in the joint hole 33 of the precast deck slab 3. The slab-side joint 50 suppresses shifting of the precast deck slab 3. The steel pipe 41 of the girder-side joint 40F only needs to be buried to the extent that it fits within the cover portion of the existing girder 2, which makes it possible to suppress interference between the steel pipe 41 and the reinforcing bars of the existing girder 2.

[0089] Furthermore, the fixing plate 47F of the girder-side joint 40F is fixed to the steel pipe 41, arranged along the upper surface 22a of the existing girder 2, and fixed to the existing girder 2 by fasteners 48. The steel pipe 41 can be more firmly fixed to the existing girder 2.

[0090] (Modification 2 of the Seventh Embodiment) Next, a second modification of the seventh embodiment will be described mainly with reference to Fig. 19. The same or similar members and parts as those in the above-described embodiment will be designated by the same reference numerals, and the description thereof will be omitted, and only the configurations different from the embodiment will be described.

[0091] FIG. 19 is a plan view of a girder-side joint portion and a deck-slab-side joint portion of a joint structure between a girder and a deck slab according to Modification 2 of the seventh embodiment of the present invention. As shown in Fig. 19, fixing plates 47G of the girder-side joint 40G are provided at four locations at equal intervals on the outer peripheral surface 45 of the steel pipe 41. The number and arrangement positions of the fixing plates 47G can be set as appropriate.

[0092] In the girder-to-deck slab joint structure 1 configured in this manner, a girder-side joint 40G having a steel pipe 41 is fixed to the existing girder 2. The slab-side joint 50 is fixed to the precast deck slab 3 by being embedded in a filling portion 60 filled in the joint hole 33 of the precast deck slab 3. The slab-side joint 50 suppresses shifting of the precast deck slab 3. The steel pipe 41 of the girder-side joint 40G only needs to be embedded to the extent that it fits within the cover portion of the existing girder 2, which makes it possible to suppress interference between the steel pipe 41 and the reinforcing bars of the existing girder 2.

[0093] Furthermore, the fixing plate 47G of the girder-side joint 40G is fixed to the steel pipe 41, arranged along the upper surface 22a of the existing girder 2, and fixed to the existing girder 2 by fasteners 48. The steel pipe 41 can be more firmly fixed to the existing girder 2.

[0094] The shapes and combinations of the components shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., within the scope of the present invention.

[0095] For example, in the second embodiment, the steel pipe 41A and the steel pipe 51A are configured to be screwed together, but the present invention is not limited to this. The method of connecting the lower steel pipe and the upper steel pipe is not limited to screwing together, and bolting, welding, or other suitable methods can be used.

[0096] Furthermore, in the fifth embodiment, the stud dowel 53 is fixed to the outer peripheral surface 45 of the steel pipe 41D, and in the sixth embodiment, the stud dowel 53 is fixed to the inner peripheral surface 46 of the steel pipe 41D, but the present invention is not limited to this. The stud dowel 53 may also be fixed to the annular upper surface of the steel pipe 41D.

[0097] In the seventh embodiment, the configuration of the deck slab-side joint may be any of the configurations shown in the second to sixth embodiments.

[0098] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the United Nations Summit in September 2015. The precast deck joint structure 1 according to this embodiment can contribute to achieving one of the 17 SDGs, for example, goal 11, "Make cities and towns inclusive and sustainable." [Explanation of symbols]

[0099] 1. Joint structure between girder and deck slab 2 Existing girder (girder) 3 Precast deck 4 Joining means 26 Groove 33 Junction hole 40, 40A, 40B, 40C, 40D, 40E, 40F Girder side joint 41,41A,41B,41C steel pipe 44,44C Upper plate 45 Outer surface 46 Inner surface 47, 47F, 47G fixing plate 48 Fasteners 50,50A,50B,50C,50D Floor slab side joint 51A steel pipe 53 Stud dowel 60 Filling section

Claims

1. reinforced concrete or prestressed concrete girders; A precast deck supported by the girder; and a connecting means for connecting the girder and the precast deck, The joining means is a girder-side joint having a steel pipe fixed to the girder and arranged with its axis facing in the vertical direction; A joint hole formed through the precast deck in the vertical direction; A deck slab side joint portion provided in the girder side joint portion and inserted into the joint hole; A joint structure between a girder and a deck slab, having a filled portion filled into the joint hole and in which the deck slab side joint portion is buried.

2. The beam has an annular groove recessed downward from the upper surface, The joining structure between a girder and a deck slab according to claim 1 , wherein the steel pipe is fixed to the groove.

3. 3. The joint structure between a girder and a deck slab according to claim 1, wherein the deck slab side joint portion is the steel pipe protruding upward from the girder.

4. 3. A joint structure between a girder and a deck slab according to claim 1 or 2, wherein the deck slab side joint is another steel pipe arranged with its axis oriented in the vertical direction and joined to the steel pipe.

5. 5. A joint structure between a girder and a deck slab according to claim 4, wherein the other steel pipe of the deck slab side joint is screwed to the steel pipe of the girder side joint.

6. 3. The joint structure between a girder and a deck slab according to claim 1, wherein the deck slab-side joint portion has a stud dowel fixed to the girder-side joint portion.

7. 7. The joining structure between a girder and a deck slab according to claim 6, wherein the stud dowel is provided so as to extend upward from an upper plate provided so as to close the upper part of the steel pipe.

8. 8. The joining structure between a girder and a deck slab according to claim 7, wherein the outer edge of the upper plate extends radially outward beyond the steel pipe.

9. 7. The joining structure between a girder and a deck slab according to claim 6, wherein the stud dowel is fixed to the outer peripheral surface of the steel pipe.

10. 7. The joining structure between a girder and a deck slab according to claim 6, wherein the stud dowel is fixed to the inner peripheral surface of the steel pipe.

11. the girder-side joint has a fixing plate fixed to the steel pipe and arranged along the upper surface of the girder; 3. The joining structure between a girder and a deck slab according to claim 1, wherein the fixing plate is fixed to the girder by a fastener.

12. a groove forming step of forming an annular groove recessed downward from the upper surface of the girder; a girder-side joint fixing process in which a steel pipe of the girder-side joint is arranged in the groove so that its axis is oriented in the vertical direction, and the steel pipe is fixed to the groove; a precast deck installation process in which the precast deck is installed above the girder so that a deck-side joint provided in the girder-side joint is inserted into a joint hole formed in the precast deck in the vertical direction; A method for joining a girder and a deck slab, comprising a deck slab side joint fixing process for filling the joint hole with a filling portion to bury the deck slab side joint.

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