Joint structure, and floor slab connection method

Abstract

To provide a joint structure capable of reducing the joint width compared to conventional technology to solve the problems of conventional technology, and a floor slab connection method.SOLUTION: A disclosed joint structure is a joint structure of a precast steel-concrete composite deck consisting of a bottom steel plate and a deck of concrete including a splice plate and multiple splice bolts. The splice plate is fixed to the bottom steel plate on the second end of the steel-concrete composite deck. Adjacent steel-concrete composite decks are connected by the splice bolt being inserted into the first bolt hole of the splice plate of one adjacent steel-concrete composite deck and the steel plate bolt hole of the other adjacent steel-concrete composite deck, and then tightened.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a technology relating to precast steel-concrete composite deck slabs consisting of a bottom steel plate and a concrete deck slab, and more specifically to a joint structure for steel-concrete composite deck slabs that utilizes a bottom steel plate protruding from the concrete deck slab, and a method for connecting steel-concrete composite deck slabs using this joint structure. [Background technology]

[0002] It has been pointed out that the construction infrastructure (hereafter referred to as "construction infrastructure"), which was developed intensively during the period of high economic growth, is already showing signs of considerable deterioration. In 2014, the Council for Social Capital Development compiled a "Recommendation for Full-scale Implementation of Measures to Counteract Aging Roads," which cited the Sasago Tunnel ceiling collapse accident of 2012 as an example, sounding the alarm that "in the near future, this will lead to fatal incidents, such as the collapse of bridges, affecting human lives and social infrastructure," and strongly advocated the importance of maintaining and managing construction infrastructure.

[0003] Against this background, the government has promulgated a ministerial ordinance amending part of the Road Act Enforcement Regulations, formulating periodic inspection guidelines that outline specific construction infrastructure inspection methods, areas to look out for in major abnormalities, and photographs of case studies. These periodic inspection guidelines apply to bridges with a length of 2.0m or more, which is said to number around 700,000, and stipulate that the first inspection should be carried out within two years of opening to service, with periodic inspections thereafter to be carried out once every five years.

[0004] Meanwhile, the "Highway Bridge Specifications," which are the standards for designing road bridges, have been revised from time to time since the draft of the Steel Highway Bridge Design Specifications was published in 1939, and were significantly revised in particular after the Hyogo-ken Nanbu Earthquake. As a result, there are many cases where bridges that previously had sufficient strength are found to have insufficient strength in light of current design standards.

[0005] Due to the two reasons mentioned above, namely deterioration and insufficient strength, bridges are now frequently reinforced or rebuilt. Furthermore, even if the girder members are sound, if the deck that supports the vehicle load deteriorates, the deck is repaired or deck renewal work is carried out to replace the deteriorated deck with a new one.

[0006] However, current road bridges ensure a large volume of traffic, meaning they support the movement of people and the distribution industry, and so cannot be easily taken out of service. In particular, viaducts for expressways and other roads exclusively for automobiles carry tens of thousands of vehicles per day, and if they were to be closed to traffic, the economic losses would be immeasurable, and if emergency patients could not be transported, it could become a social problem. For this reason, when construction is carried out on a road bridge that is in service, it is always necessary to reopen it to traffic as soon as possible, and contractors are working hard to shorten the construction period in order to achieve this.

[0007] Traditionally, the cast-in-place concrete method has been used to construct concrete decks. This method requires assembling formwork on-site, pouring fresh concrete, and then allowing it to cure for a specified period of time. This means that the site is occupied for a long period of time, and when replacing the deck of a road bridge in service, traffic is restricted for an equally long period of time.

[0008] Therefore, in recent years, there has been an increase in the use of precast concrete decks (hereinafter simply referred to as "precast decks") instead of cast-in-place concrete construction methods. Because precast decks are manufactured in factories, quality control is easy, and what's more, the on-site process is mainly installation, which means that the time required for construction on-site can be shortened.

[0009] Well-known precast decks include steel-concrete composite decks, PC (Prestressed Concrete) decks, and RC (Reinforced Concrete) decks. Among these, steel-concrete composite decks are primarily composed of a base steel plate, concrete, and reinforcing bars, with the base steel plate functioning as a structural member bearing cross-sectional forces. Because the structure effectively combines steel members that bear tensile forces and concrete that bear compressive forces, the deck is highly rigid and can accommodate long spans. Furthermore, the base steel plate of a steel-concrete composite deck functions as a formwork until the concrete hardens, and the steel plate, reinforced with vertical ribs, acts as a self-supporting support, eliminating some of the work required for formwork, making it an excellent structure in terms of construction (manufacturing).

[0010] With regard to steel-concrete composite decks, which have many advantages, various improvement techniques have been proposed. In particular, the applicant of the present application has proposed various techniques for steel-concrete composite decks, as shown in Patent Document 1, for example. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-270270 Summary of the Invention [Problem to be solved by the invention]

[0012] The technology disclosed in Patent Document 1 is a steel-concrete composite deck using steel plate panels consisting of a bottom steel plate and vertical ribs, with multiple through-holes in the vertical ribs to enhance adhesion to the concrete and the vertical ribs positioned and fixed in the direction of the main girders to prevent buckling of the bottom steel plate. The steel-concrete composite deck according to Patent Document 1 can be constructed using a cast-in-place concrete method or can be manufactured as a precast product in a factory.

[0013] When installing precast deck slabs on site, multiple precast deck slabs are placed in their designated positions, and gaps (joints) are formed between adjacent precast deck slabs. For example, in the case of a road bridge, if the bridge is divided in the direction of the road width (perpendicular to the bridge axis), a "vertical joint" extending in the direction of the bridge axis is formed, and if the bridge is divided in the direction of travel (the direction of the bridge axis), a "horizontal joint" extending in the direction perpendicular to the bridge axis is formed. Adjacent precast deck slabs are then connected at these joints, and the means for connecting them is called a "joint."

[0014] Typically, filler concrete or mortar is poured into the joints. In other words, precast decks are used to speed up on-site construction, but the traditional cast-in-place concrete method is used for the joints. Therefore, in order to speed up on-site construction, it is desirable to reduce the amount of work required for the joints, that is, the amount of filler concrete poured, and therefore it is desirable to keep the joint width as small as possible. Furthermore, if the joint width is large, the space available for construction (work space) is reduced accordingly, and if part of the road is opened to the public, the width of the road will also be limited, so in this respect it is also desirable to keep the joint width as small as possible.

[0015] When installing precast steel-concrete composite decks, joints using splice plates are common. Specifically, splice plates placed below (or above, or both above and below) adjacent steel-concrete composite decks are joined to the bottom steel plates on both sides with bolts or other means, and then concrete is poured into the gap. This method requires a certain amount of clearance in addition to the width of the splice plates, which means that a corresponding joint width is required. Therefore, conventional methods for installing precast steel-concrete composite decks tend to result in relatively large joint widths, and therefore a technology that can reduce joint widths was needed.

[0016] The object of the present invention is to solve the problems associated with the prior art, that is, to provide a joint structure and a deck slab connecting method that can reduce the joint width compared to the prior art. [Means for solving the problem]

[0017] The present invention was made with a focus on the point that steel-concrete composite deck slabs are connected using bottom steel plates protruding from the deck concrete, and is an invention based on an unprecedented idea.

[0018] The joint structure of the present invention is a joint structure for precast steel-concrete composite decks consisting of a bottom steel plate and a concrete deck, and includes a splice plate and multiple splice bolts. The precast steel-concrete composite deck that is the subject of the present invention has the following characteristics: The concrete deck has a first end face and a second end face that face each other in a first axial direction, and the bottom steel plate has a splice surface that protrudes from the first end face. The splice surface also has multiple steel plate bolt holes aligned in a second axial direction (perpendicular or oblique to the first axial direction). The splice plate that constitutes the joint structure of the present invention has multiple first bolt holes aligned in a first row and is fixed to the bottom steel plate on the second end face side, and one splice bolt is inserted into the first bolt hole of the splice plate. Adjacent steel-concrete composite decks are connected by inserting and tightening a splice bolt through the first bolt hole of the splice plate of one adjacent steel-concrete composite deck and the steel plate bolt hole of the other steel-concrete composite deck.

[0019] The joint structure of the present invention can also be such that the splice plate is bolted to the bottom steel plate. In this case, a plurality of slab bolts aligned in a second axial direction are embedded in the slab concrete on the second end face side of the steel-concrete composite slab, penetrating the bottom steel plate, and a plurality of second bolt holes aligned in a second row are formed in the splice plate. The splice plate is fixed to the bottom steel plate by inserting the slab bolts into the second bolt holes in the splice plate and tightening them.

[0020] In the joint structure of the present invention, the splice plate may be fixed to the bottom steel plate by welding.

[0021] In the joint structure of the present invention, the plate material (1) can be bent to form a splice plate as part of the bottom steel plate.

[0022] The joint structure of the present invention may also be such that the steel plate bolt hole in the splice surface and the first bolt hole in the splice plate are elongated holes. In this case, the steel plate bolt hole is arranged in the first axial direction and the first bolt hole is arranged in the second axial direction, or the steel plate bolt hole is arranged in the second axial direction and the first bolt hole is arranged in the first axial direction.

[0023] The deck slab connecting method of the present invention is a method for connecting precast steel-concrete composite decks consisting of bottom steel plates and deck concrete, and includes a steel-concrete composite deck slab installation step and a second splice plate installation step. In the steel-concrete composite deck slab installation step, one steel-concrete composite deck slab is installed adjacent to the other steel-concrete composite deck slab, and in the second splice plate installation step, a splice plate is attached to the other steel-concrete composite deck slab. In the second splice plate installation step, a splice bolt is inserted through the steel plate bolt hole of the other steel-concrete composite deck slab and the first bolt hole of the splice plate, and then tightened.

[0024] The deck connecting method of the present invention can also be a method further comprising a first splice plate installation step, in which the deck bolts of one steel-concrete composite deck are inserted into the second bolt holes of the splice plate and then tightened to fix the splice plate to the bottom steel plate.

[0025] The deck slab connecting method of the present invention can also be a method for connecting precast steel-concrete composite deck slabs, with the steel plate bolt holes on the splice surface and the first bolt holes in the splice plate being elongated holes. The steel plate bolt holes are arranged in the first axial direction and the first bolt holes are arranged in the second axial direction, or the steel plate bolt holes are arranged in the second axial direction and the first bolt holes are arranged in the first axial direction. In this case, in the second splice plate installation step, the splice bolts are inserted with the steel plate bolt holes and the first bolt holes overlapping.

[0026] The slab connecting method of the present invention can also be a method further comprising a joint filling step, in which mortar or concrete is poured into the joints formed between the first and second end faces of adjacent concrete slabs. This joint filling step is performed after the second splice plate installation step. [Effects of the Invention]

[0027] The joint structure and deck slab connecting method of the present invention have the following effects. (1) The joint width can be made smaller than in conventional techniques, which results in faster on-site construction. (2) Since the joint width can be reduced, a larger working space can be secured, and the width of the road open to the public can also be set wider. (3) Since the splice plates can be attached to the steel-concrete composite deck slab in advance at the factory, the amount of work required on-site is reduced accordingly, which also means that on-site construction can be expedited. [Brief explanation of the drawings]

[0028] [Figure 1] (a) is a vertical cross-sectional view showing a schematic diagram of the joint-type steel-concrete composite deck that is the subject of the present invention, and (b) is a plan view showing a schematic diagram of the joint-type steel-concrete composite deck that is the subject of the present invention. [Figure 2] This is a plan view showing a joint-type steel-concrete composite deck slab connected with horizontal joints. [Figure 3] (a) is a vertical cross-sectional view showing a schematic representation of the "splicing surface" formed on a joint-type steel-concrete composite deck, and (b) is a plan view showing a schematic representation of the splicing surface formed on a joint-type steel-concrete composite deck. [Figure 4] (a) is a vertical cross-sectional view showing a schematic diagram of a "deck bolt" installed in a joint-type steel-concrete composite deck, and (b) is a horizontal cross-sectional view showing a schematic diagram of a deck bolt installed in a joint-type steel-concrete composite deck. [Figure 5] FIG. 2 is a plan view schematically showing a "splice plate" that constitutes the joint structure of the present invention. [Figure 6] A step diagram showing the main steps until the joint structure of the present invention is constructed by connecting adjacent joint-type steel-concrete composite deck slabs. [Figure 7] (a) is a plan view showing a schematic diagram of a situation in which the first bolt hole of the elongated hole is arranged so as to be in the first axis direction and the steel plate bolt hole of the elongated hole is arranged so as to be in the second axis direction, and (b) is a plan view showing a schematic diagram of a situation in which the first bolt hole of the elongated hole is arranged so as to be in the second axis direction and the steel plate bolt hole of the elongated hole is arranged so as to be in the first axis direction. [Figure 8] 1 is a vertical cross-sectional view schematically showing a splice plate and a bottom steel plate formed by bending a part of the plate material. [Figure 9] FIG. 1 is a flow chart showing the flow of the main steps of the deck slab connecting method of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] An example of an embodiment of the joint structure and deck slab connecting method of the present invention will be described with reference to the drawings.

[0030] 1. Joint structure First, the joint structure of the present invention will be described. The deck slab connection method of the present invention is a method for connecting steel-concrete composite deck slabs using the joint structure of the present invention. Therefore, the joint structure of the present invention will be described first, and then the deck slab connection method of the present invention will be described.

[0031] Figure 1 is a diagram showing a precast steel-concrete composite deck (hereinafter referred to as "joint-type steel-concrete composite deck 100") that is the subject of the present invention, where (a) is a vertical cross-sectional view and (b) is a plan view seen from above. As shown in this figure, the joint-type steel-concrete composite deck 100, like conventional precast steel-concrete composite decks, is composed of a bottom steel plate 110 (also called a steel plate panel) and a concrete deck 120, and can also be composed of perforated vertical ribs 130.

[0032] The joint structure of the present invention connects adjacent joint-type steel-concrete composite deck slabs 100, and can connect adjacent joint-type steel-concrete composite deck slabs 100 with "vertical joints" (i.e., adjacent in the direction perpendicular to the bridge axis), or it can connect adjacent joint-type steel-concrete composite deck slabs 100 with "horizontal joints" (i.e., adjacent in the direction of the bridge axis), or it can connect adjacent joint-type steel-concrete composite deck slabs 100 with vertical and horizontal joints (i.e., adjacent on all four sides).For convenience, the direction in which joint-type steel-concrete composite deck slabs 100 are connected will be referred to as the "first axis direction," and the horizontal direction perpendicular or diagonal to that (at least 45° and less than 90°) will be referred to as the "second axis direction." Furthermore, of the end faces (side faces) of the slab concrete 120 that make up the joint-type steel-concrete composite slab 100, one that faces in the first axial direction will be referred to as the "first end face 120F," and the other will be referred to as the "second end face 120B," and further the first end face side in the first axial direction will be referred to as the "first direction," and the second end face side will be referred to as the "second direction." In other words, the joint-type steel-concrete composite slab 100 has the first end face 120F formed in the first direction in the first axial direction, and the second end face 120B formed in the second direction.

[0033] For example, Figure 1 shows a case where adjacent joint-type steel-concrete composite decks 100 are connected by vertical joints, in which case the direction perpendicular to the bridge axis is the first axis direction, and the bridge axis direction is the second axis direction. In this figure, the left side in the first axis direction is the first direction, and the right side is the second direction. On the other hand, Figure 2 shows a case where adjacent joint-type steel-concrete composite decks 100 are connected by horizontal joints, in which case the bridge axis direction is the first axis direction, and the direction perpendicular to the bridge axis is the second axis direction. In this figure, the upper side in the first axis direction is the first direction, and the lower side is the second direction.

[0034] FIG. 3 is a diagram schematically illustrating the "splicing surface 111" formed on the joint-type steel-concrete composite deck 100, where (a) is a cross-sectional view cut along a vertical plane in the first axis direction, and (b) is a plan view viewed from above. Note that while FIG. 1(a) includes the perforated vertical ribs 130, FIG. 1(b) omits the perforated vertical ribs 130 for convenience. As shown in FIG. 3(a), on the first end face 120F side of the joint-type steel-concrete composite deck 100, the bottom steel plate 110 forms a splicing surface 111 that protrudes in a first direction from the first end face 120F. In other words, the splicing surface 111 is part of the bottom steel plate 110, and the deck concrete 120 is not placed on the upper surface of the splicing surface 111.

[0035] 3(b), a plurality of (nine in the figure) steel plate bolt holes 111H are formed at intervals in the second axial direction on the contact surface 111. These steel plate bolt holes 111H are preferably formed at positions on the contact surface 111 closer to the first end face 120F (i.e., the second direction) so as to be aligned roughly in a row.

[0036] Figure 4 is a diagram showing a "slab bolt 140" provided in the joint-type steel-concrete composite slab 100, where (a) is a cross-sectional view cut in a vertical plane in the first axial direction, and (b) is a cross-sectional view cut in a horizontal plane at the position of the bottom steel plate 110. As shown in Figure 4(a), a slab bolt 140 is provided on the second end surface 120B side of the joint-type steel-concrete composite slab 100. The top of the slab bolt 140 is embedded in the slab concrete 120, and the bolt shaft penetrates the bottom steel plate 110 and protrudes further downward.

[0037] 4(b), multiple (nine rows in the figure) deck bolts 140 are arranged at intervals in the second axial direction. These deck bolts 140 should be positioned closer to the second end face 120B side (i.e., the second direction) of the deck concrete 120 so that they are aligned roughly in a row.

[0038] 5 is a plan view seen from above, schematically illustrating a "splice plate 150" constituting the joint structure of the present invention. As shown in this figure, a plurality of insertion holes (in the figure, 9 holes x 2 rows) arranged in two rows (first row and second row) are formed in splice plate 150. For convenience, the insertion holes formed in the first row will be referred to as "first bolt holes 150B," and the insertion holes formed in the second row will be referred to as "second bolt holes 150F."

[0039] The longitudinal dimension of splice plate 150 is set to be equal to the length of first end face 120F and second end face 120B of slab concrete 120, while the lateral dimension of splice plate 150 is designed to be slightly larger than the length of splice surface 111 in the first axial direction. Second bolt holes 150F are formed to match the arrangement and number of deck bolts 140, and first bolt holes 150B are formed to match the arrangement and number of steel plate bolt holes 111H in splice surface 111.

[0040] The procedure for connecting adjacent joint-type steel-concrete composite deck slabs 100 will be described with reference to Figure 6. Figure 6 is a step diagram showing the main steps until the joint structure of the present invention is formed by connecting adjacent joint-type steel-concrete composite deck slabs 100. When connecting adjacent joint-type steel-concrete composite deck slabs 100, both joint-type steel-concrete composite deck slabs 100 are positioned so that their first axial directions coincide and their second end faces 120B and first end faces 120F face each other. For convenience, the joint-type steel-concrete composite deck slab 100 (left side in the figure) relating to the second end face 120B will be referred to as the "first joint-type steel-concrete composite deck slab 100F," and the joint-type steel-concrete composite deck slab 100 (right side in the figure) relating to the first end face 120F will be referred to as the "second joint-type steel-concrete composite deck slab 100B."

[0041] As shown in FIG. 6(a), first, a splice plate 150 is attached to the first joint-type steel-concrete composite deck 100F. Specifically, the deck bolts 140 of the first joint-type steel-concrete composite deck 100F are inserted into the second bolt holes 150F of the splice plate 150, and then the deck bolts 140 are tightened using nuts or the like. The process of attaching the splice plate 150 to the first joint-type steel-concrete composite deck 100F can be performed on-site after the first joint-type steel-concrete composite deck 100F is installed, or it can be performed in advance at a factory or the like. When attaching the splice plate 150 at a factory or the like, it is preferable to attach the splice plate 150 with the deck bolts 140 before pouring the deck concrete. However, the splice plate 150 can also be attached by inserting the deck bolts 140 from below using anchor holes provided in the deck concrete 120. On the other hand, when the splice plate 150 is to be attached on site, it is desirable to embed the deck bolts 140 in the deck concrete at a factory and then attach the splice plate 150 on site.

[0042] Once the splice plate 150 is attached to the first joint-type steel-concrete composite deck 100F, the second joint-type steel-concrete composite deck 100B is installed as shown in FIG. 6(b). As described above, the second end face 120B of the first joint-type steel-concrete composite deck 100F is installed so that it faces the first end face 120F of the second joint-type steel-concrete composite deck 100B. The splice plate 150 is then attached to the second joint-type steel-concrete composite deck 100B. Specifically, the first bolt hole 150B of the splice plate 150 is aligned with the steel plate bolt hole 111H of the splice surface 111, and the "splice bolt 160" that constitutes the joint structure of the present invention is inserted into these bolt holes and tightened using a nut or the like. While the nut is positioned on the bottom in FIG. 6, the combination may be reversed.

[0043] However, if the first bolt hole 150B and the steel plate bolt hole 111H are each formed as a "round hole," it may take time to align them on-site. Therefore, it is preferable to form the first bolt hole 150B and the steel plate bolt hole 111H as "long holes" and arrange them so that their axial directions are approximately perpendicular (including perpendicular). Of course, they can also be arranged so that their axial directions are approximately parallel (including parallel). For example, in FIG. 7( a), the first bolt hole 150B is arranged in the first axial direction, while the steel plate bolt hole 111H is arranged in the second axial direction. Also, in FIG. 7( b), the first bolt hole 150B is arranged in the second axial direction, and the steel plate bolt hole 111H is arranged in the first axial direction. This arrangement increases the degree of freedom when inserting the splice bolt 160, which means that on-site alignment can be easily performed.

[0044] When the splice plate 150 is attached to the second joint-type steel-concrete composite deck 100B, a gap (hereinafter referred to as the "joint JT") is formed between the second end face 120B and the first end face 120F, as shown in FIG. 6(b). As mentioned above, in the prior art, the joint is formed with a width that is the width of the splice plate plus a certain amount of margin, and therefore the joint width tends to be relatively large. On the other hand, in the joint structure of the present invention, the protruding length of the splice surface 111 is approximately the width of the joint JT, and this protruding length of the splice surface 111 is shorter than the width of the splice plate 150. In other words, the joint structure of the present invention allows the width of the joint JT to be significantly reduced compared to the prior art.

[0045] Once the splice plate 150 is attached to the second joint-type steel-concrete composite deck 100B, the joint JT is filled with mortar or concrete, as shown in Figure 6(c). Typically, concrete is poured when the joint JT is wide, and non-shrink mortar is filled when the width is relatively narrow. Because the joint JT in the joint structure of the present invention is formed with a relatively narrow width, mortar can be selected, but concrete may also be selected depending on the required specifications.

[0046] Up to this point, we have explained an example in which the splice plate 150 is fixed to the joint-type steel-concrete composite deck 100 by bolting, but various conventional methods can be used to fix the splice plate 150 to the joint-type steel-concrete composite deck 100. For example, the splice plate 150 can be fixed to the bottom steel plate 110 by welding in a factory, or the splice plate 150 and the bottom steel plate 110 can be formed as a single piece from the beginning, as shown in Figure 8. In the example of Figure 8, a step is provided between the splice plate 150 and the bottom steel plate 110 by bending a portion of the plate material (steel plate) 1.

[0047] 2. Floor slab connection method Next, the slab connecting method of the present invention will be described with reference to Figure 9. The slab connecting method of the present invention is a method for connecting joint-type steel-concrete composite slabs 100 using the joint structure of the present invention described up to this point. Therefore, we will avoid overlapping explanations with those explained in the joint structure of the present invention and will mainly explain the details unique to the slab connecting method of the present invention. In other words, the details not described here are the same as those explained in "1. Joint structure."

[0048] FIG. 9 is a flow chart showing the main steps of the slab connecting method of the present invention. To connect joint-type steel-concrete composite slabs 100 using the joint structure of the present invention, first, as shown in this figure, a splice plate 150 is attached to the first joint-type steel-concrete composite slab 100F (Step 201 in FIG. 9). Specifically, the slab bolts 140 of the first joint-type steel-concrete composite slab 100F are inserted into the second bolt holes 150F of the splice plate 150 and then tightened using nuts or other fasteners. As mentioned above, this step can be performed on-site after the first joint-type steel-concrete composite slab 100F is installed, or it can be performed in advance at a factory, etc. When fabricating a joint-type steel-concrete composite slab 100, the slab bolts 140 are attached to the bottom steel plate 110 before concrete is poured. However, the splice plate 150 can be attached to the slab bolts 140 either before or after pouring the concrete.

[0049] Once the splice plate 150 is attached to the first joint-type steel-concrete composite deck 100F, the second joint-type steel-concrete composite deck 100B is installed so that the second end face 120B of the first joint-type steel-concrete composite deck 100F faces the first end face 120F of the second joint-type steel-concrete composite deck 100B (Step 202 in Figure 9). Next, the splice plate 150 is attached to the second joint-type steel-concrete composite deck 100B (Step 203 in Figure 9). Specifically, the splice bolt 160 is inserted through the first bolt hole 150B of the splice plate 150 and the steel plate bolt hole 111H of the splice surface 111, and then tightened using a nut or the like. Then, once the splice plate 150 is attached to the second joint-type steel-concrete composite deck 100B, the joint JT formed between the second end face 120B and the first end face 120F is filled with mortar, concrete, etc. (Step 204 in Figure 9), and the structure is left to cure until the mortar, etc. hardens. [Industrial Applicability]

[0050] The joint structure and deck connection method of the present invention can be used for bridges of all types, such as road bridges and railway bridges, as well as for various bridges such as river bridges, overpasses, and railway bridges. Furthermore, the present invention can be applied not only to deck replacement work for existing bridges, but also to new bridge construction work. Considering that the present invention can provide safer traffic and ultimately extend the lifespan of bridges, it can be said to be an invention that can be expected to not only be used industrially but also make a significant contribution to society. [Explanation of symbols]

[0051] 100 Jointed steel-concrete composite deck 100F First joint type steel-concrete composite deck 100B Second joint type steel-concrete composite deck 110 Bottom steel plate (for jointed steel-concrete composite deck) 111 (of the bottom steel plate) splice surface 111H Steel plate bolt hole (on the splice surface) 120 (Jointed steel-concrete composite deck) Deck concrete 120F (Concrete deck) First edge 120B (Concrete Deck) Second End 130 Perforated longitudinal ribs (for jointed steel-concrete composite decks) 140 (jointed steel-concrete composite deck) deck bolt 150 Connection plate 150B (Splice plate) 1st bolt hole 150F (Splice plate) 2nd bolt hole 160 Splice bolt JT joint area

Claims

1. A joint structure of a precast steel concrete composite deck consisting of a bottom steel plate and a deck concrete, The concrete deck has a first end surface and a second end surface that face each other in a first axial direction, The bottom steel plate has a splice surface that protrudes from the first end surface, A plurality of steel plate bolt holes are formed on the splicing surface and aligned in a second axial direction that is perpendicular or oblique to the first axial direction, a splice plate having a plurality of first bolt holes arranged in a first row and fixed to the bottom steel plate on the second end surface side; a plurality of splice bolts inserted into the first bolt holes of the splice plate, The adjacent steel concrete composite decks are connected by inserting the splice bolt into the first bolt hole of the splice plate of one adjacent steel concrete composite deck and the steel plate bolt hole of the other adjacent steel concrete composite deck and tightening the bolt. A joint structure characterized by the above.

2. On the second end face side of the steel concrete composite deck slab, a plurality of deck bolts arranged in the second axial direction are embedded in the deck concrete while penetrating the bottom steel plate, The splice plate has a plurality of second bolt holes arranged in a second row, The deck bolt is inserted into the second bolt hole of the splice plate and then tightened, thereby fixing the splice plate to the bottom steel plate.

2. The joint structure according to claim 1, wherein:

3. The splice plate is fixed to the bottom steel plate by welding.

2. The joint structure according to claim 1, wherein:

4. The splice plate is formed as a part of the bottom steel plate by bending the plate material.

2. The joint structure according to claim 1, wherein:

5. the steel plate bolt hole and the first bolt hole are elongated holes, the steel plate bolt holes are arranged in the first axial direction and the first bolt holes are arranged in the second axial direction, or the steel plate bolt holes are arranged in the second axial direction and the first bolt holes are arranged in the first axial direction, 2. The joint structure according to claim 1, wherein:

6. A method for connecting a precast steel-concrete composite deck consisting of a bottom steel plate and a deck concrete, comprising: The concrete deck has a first end surface and a second end surface that face each other in a first axial direction, The bottom steel plate has a splice surface that protrudes from the first end surface, A plurality of steel plate bolt holes are formed on the splicing surface and aligned in a second axial direction that is perpendicular or oblique to the first axial direction, a splice plate having a plurality of first bolt holes arranged in a first row is fixed to the bottom steel plate on the second end surface side; a steel concrete composite deck installation process for installing the other steel concrete composite deck adjacent to one of the steel concrete composite decks; A second splice plate installation process for attaching the splice plate to the other steel-concrete composite deck slab, In the second splice plate installation step, the splice bolt is The bolt is inserted into the first bolt hole of the splice plate of one of the steel concrete composite slabs and the steel plate bolt hole of the other of the steel concrete composite slabs, and then tightened. A deck slab connecting method characterized by the above.

7. On the second end face side of the steel concrete composite deck slab, a plurality of deck bolts arranged in the second axial direction are embedded in the deck concrete while penetrating the bottom steel plate, The splice plate has a plurality of second bolt holes arranged in a second row, The method further includes a first splice plate installation step of attaching the splice plate to one of the steel concrete composite deck slabs, In the first splice plate installation step, the deck bolts for one of the steel concrete composite decks are inserted into the second bolt holes of the splice plate and then tightened.

7. The deck slab connecting method according to claim 6.

8. the steel plate bolt hole and the first bolt hole are elongated holes, the steel plate bolt holes are arranged in the first axial direction and the first bolt holes are arranged in the second axial direction, or the steel plate bolt holes are arranged in the second axial direction and the first bolt holes are arranged in the first axial direction, In the second splice plate installation step, the splice bolt is inserted in a state where the steel plate bolt hole and the first bolt hole are overlapped.

7. The deck slab connecting method according to claim 6.

9. Further provided is a joint filling process of pouring mortar or concrete into a joint formed by opposing the first end surface and the second end surface of the adjacent deck concrete, The joint filling process is performed after the second splice plate installation process.

7. The deck slab connecting method according to claim 6.

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