Slab, slab connecting method and slab manufacturing method

Abstract

To reduce construction time and costs in new slab construction or replacement work.SOLUTION: A slab 20 includes a slab body part 21, a ground cover part 25 which is integrally formed at the end of the slab body part 21 in the direction perpendicular to the bridge axis and protrudes upward from the slab body part 21, a slab top end waterproof layer 31 which is made of ultra-high strength fiber reinforced concrete that covers the upper part of the slab body part 21, and a ground cover side waterproof layer 33 which is made of ultra-high strength fiber reinforced concrete that covers the road side of the ground cover part 25.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a deck, a deck connection method, and a deck manufacturing method, and in particular to a technique suitable for a deck of a secondary concrete product having an integral waterproof layer. [Background technology]

[0002] Generally, highway and other road bridges are composed of main girders erected on piers, deck slabs installed on the top of the main girders, and wall parapets installed on the top of the deck slabs. The infiltration of chloride ions contained in antifreeze agents and water leakage can cause the deck slabs to deteriorate. For this reason, in new deck slab construction and replacement construction, after the deck slab is installed on the main girders, a waterproof layer made of sheet-based or coating-based waterproofing material (hereinafter referred to as the conventional waterproof layer) is constructed on the top surface of the deck slab.

[0003] However, the conventional waterproofing layer has a multi-layer structure and requires many steps, which makes it prone to construction defects and increases the construction period and cost. In addition, the conventional waterproofing layer cannot be installed in rainy or humid weather, which can lead to construction delays due to bad weather. Another issue is that the conventional waterproofing layer must be reapplied every time the pavement is replaced.

[0004] A secondary concrete floor slab that solves these problems is disclosed, for example, in Patent Document 1. The precast concrete floor slab described in Patent Document 1 is constructed by pouring ordinary concrete into a formwork at a factory to construct the concrete floor section, and then pouring ultra high strength fiber reinforced concrete (hereinafter also referred to as UFC) on top of the concrete floor section to construct a UFC waterproof layer, thereby eliminating the need for on-site waterproofing work. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-126991 A Summary of the Invention [Problem to be solved by the invention]

[0006] The precast concrete deck described in Patent Document 1 has a waterproof function for the deck top, but no waterproofing measures are applied to the ground cover. In other words, it does not have an end waterproof structure. As an end waterproof structure, it is possible to install a conventional waterproof layer using a sheet-based or paint-based waterproofing material at the joint between the deck and the wall balustrade after the wall balustrade is installed. However, as mentioned above, the conventional waterproof layer has problems such as being prone to construction defects, increasing construction time and construction costs, and being affected by bad weather.

[0007] The technology disclosed herein has been made in consideration of the above circumstances, and aims to provide technology that can shorten construction time and reduce construction costs in new deck construction or replacement construction work. [Means for solving the problem]

[0008] The floor slab (20) of the present disclosure is A deck body portion (21), A ground cover portion (25) that is integrally provided at an end portion of the deck body portion (21) in a direction perpendicular to the bridge axis and protrudes upward from the deck body portion (21); A deck top waterproof layer (31) formed of ultra-high strength fiber reinforced concrete covering the upper part of the deck main body (21); and a waterproof layer (33) on the side of the road of the ground cover portion (25) formed of ultra-high strength fiber reinforced concrete. It is characterized by:

[0009] Another aspect of the present disclosure is a floor slab (20): The roof top waterproof layer (32) is formed of ultra-high strength fiber reinforced concrete and covers the upper part of the roof top waterproof layer (32). It is characterized by:

[0010] In another aspect of the floor slab (20) of the present disclosure, An extension portion (31A) is provided at the end of the deck top waterproof layer (31) on the side of the ground covering portion (25), and the end face of the extension portion (31A) is in surface contact with the side face of the lower end side of the ground covering side waterproof layer (33). It is characterized by:

[0011] The deck connection method disclosed herein is a deck connection method for connecting the decks (20, 20') in the bridge axis direction, By pouring ultra-high-strength fiber-reinforced concrete between the ends of a pair of decks (20, 20') facing each other in the bridge axis direction, the pair of decks are connected to each other in the bridge axis direction, and the ultra-high-strength fiber-reinforced concrete poured between the ends functions as a waterproof layer. It is characterized by:

[0012] The manufacturing method of the present disclosure is a manufacturing method of the floor slab (20), A first step of constructing the ground cover side waterproof layer (33) in a plate shape by pouring ultra-high strength fiber reinforced concrete into a predetermined formwork; A second step of constructing the deck body portion (21) and the ground covering portion (25) integrally by pouring concrete into the constructed plate-shaped ground covering side waterproof layer (33) as a floating formwork; and a third step of constructing the deck top waterproof layer (31) by pouring ultra-high strength fiber reinforced concrete on the upper part of the constructed deck main body portion (21). It is characterized by:

[0013] A manufacturing method according to another aspect of the present disclosure includes the steps of: Between the first step and the second step, a green cut process is performed on at least the surfaces of the plate-shaped ground cover side waterproof layer (33) that are to come into contact with the deck body portion (21), the ground cover portion (25), and the deck top waterproof layer (31). It is characterized by:

[0014] A manufacturing method according to another aspect of the present disclosure includes the steps of: In the third step, a waterproof layer (32) is constructed on the top of the ground cover by pouring ultra-high strength fiber reinforced concrete on top of the ground cover portion (25). Between the first step and the second step, a green cut process is performed on the surface of the plate-shaped ground cover side waterproof layer (33) that will come into contact with the ground cover top waterproof layer (32). It is characterized by:

[0015] In the above description, in order to facilitate understanding of the present disclosure, the symbols used in the embodiments are added in parentheses to components corresponding to the embodiments, but each component is not limited to the embodiment defined by the symbol. Effect of the Invention

[0016] According to the technology disclosed herein, it is possible to shorten construction time and reduce construction costs in new deck construction or replacement construction work. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a schematic perspective view showing a deck and a wall balustrade according to the present embodiment. [Diagram 2] FIG. 2 is a schematic vertical cross-sectional view of a deck and a wall balustrade according to the present embodiment. [Diagram 3] 1A is a schematic vertical cross-sectional view of a connection portion that connects each deck slab in the bridge axis direction according to this embodiment, and FIG. 1B is a schematic perspective view of the connection portion. [Figure 4] FIG. 2 is a schematic diagram illustrating a method for manufacturing a deck according to the present embodiment. [Diagram 5] FIG. 2 is a schematic diagram illustrating a method for manufacturing a deck according to the present embodiment. [Figure 6] FIG. 2 is a schematic diagram illustrating a method for manufacturing a deck according to the present embodiment. [Figure 7] FIG. 2 is a schematic diagram illustrating a method for manufacturing a deck according to the present embodiment. [Figure 8] FIG. 2 is a schematic diagram illustrating a method for manufacturing a deck according to the present embodiment. [Figure 9]FIG. 11 is a schematic vertical cross-sectional view of a deck and a wall balustrade according to another embodiment. [Figure 10] FIG. 11 is a schematic vertical cross-sectional view of a deck and a wall balustrade according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, the deck slab, the deck slab connection method, and the deck slab manufacturing method according to this embodiment will be described with reference to the attached drawings.

[0019] [Overall configuration] 1 is a schematic perspective view showing the deck slabs 20, 20' and the wall balustrade 50 according to this embodiment. For convenience, the cross-sectional view shows the deck slabs 20, 20' cut in the bridge axis direction Y, and approximately half of the configuration in the direction perpendicular to the bridge axis X (road width direction) is omitted from the illustration. Also, the number and shape of the deck slabs 20, 20' and the wall balustrade 50 are not limited to the illustrated example.

[0020] As shown in FIG. 1, multiple deck slabs 20, 20' are installed on top of the main girder 90 and connected to each other in the bridge axis direction Y to form a road bridge. The deck slabs 20, 20' are deck slabs of secondary concrete products manufactured in advance in a factory or the like, i.e., precast concrete deck slabs, and are transported to a construction site and installed. The deck slabs 20, 20' are provided with dowel holes (not shown) into which stud dowels provided in the upper flange 91 of the main girder 90 are inserted. The deck slabs 20, 20' are solidified to the main girder 90 by inserting the stud dowels into the dowel holes and pouring a filler such as mortar into the dowel holes.

[0021] The deck 20, 20' has a plate-shaped deck body 21, 21' and a ground cover 25, 25' provided at the end of the deck body 21, 21' in the direction perpendicular to the bridge axis X. The ground cover 25, 25' protrudes upward in the vertical direction Z from the deck body 21, 21'. The height of the ground cover 25 is not particularly limited, but is formed higher than the leveling layer and surface layer of the pavement. In this embodiment, the deck body 21, 21' and the ground cover 25 are formed seamlessly and integrally in advance at a factory by pouring ordinary concrete into a predetermined formwork. The deck body 21, 21' and the ground cover 25, 25' may be PC concrete or RC concrete.

[0022] The deck 20, 20' has a UFC waterproof layer 30, 30' formed by UFC. The UFC waterproof layer 30, 30' is formed on the upper surface of the deck main body 21, 21', the upper surface of the ground cover 25, 25', and the side of the ground cover 25, 25' facing the road. UFC is a high-strength and highly durable concrete containing steel fibers, etc. UFC has a small hydraulic conductivity and high watertightness, so that the UFC waterproof layer 30, 30' can function as a waterproof structure for the deck main body 21, 21' and the ground cover 25, 25'. The details of the UFC waterproof layer 30, 30' will be described later.

[0023] A convex shear key 22, 22' is provided at the end of the deck body 21, 21' in the bridge axis direction Y. In addition, the deformed steel bar 23, 23' is provided on the shear key 22, 22' so as to protrude in the bridge axis direction Y. Each deck 20, 20' is connected by driving a UFC 40 between the deck body 21, 21' and between the ground cover 25, 25'. Hereinafter, the UFC 40 is referred to as a "connection UFC". It is preferable to use a room temperature curing type UFC for the connection UFC 40. In this embodiment, a part of the shear key 22, 22' is formed in the cover part of the deformed steel bar 23, 23'. With such a configuration, the adhesion resistance and shear resistance between the deck body 21, 21' and the connection UFC 40 are increased. That is, it is possible to effectively improve the joint strength between the end of each deck body 21, 21' and the connection UFC 40.

[0024] At the end of the UFC waterproof layer 30, 30' in the bridge axis direction Y, a plurality of convex parts 37, 37' having a substantially triangular shape in a top view are provided in the direction perpendicular to the bridge axis X. The above-mentioned connecting UFC 40 is driven between the convex parts 37 and 37' facing each other in the bridge axis direction Y. In this way, by providing a plurality of convex parts 37, 37' having a substantially triangular shape at the end of the UFC waterproof layer 30, 30', which is the joint surface, the adhesion resistance and shear resistance between the UFC waterproof layer 30, 30' and the connecting UFC 40 are increased. In other words, it is possible to effectively improve the joint strength between the end of each UFC waterproof layer 30, 30' and the connecting UFC 40.

[0025] The wall parapet 50 is a precast concrete wall parapet manufactured in advance at a factory or the like, and is transported to the construction site and installed. The wall parapet 50 functions as a protective fence for the road bridge by being connected in multiples so that the longitudinal direction extends in the bridge axis direction Y.

[0026] After the deck 20, 20' is installed on the main girder 90, the balustrade 50 is joined to the upper part of the balustrade 25, 25' (UFC waterproof layer 30, 30') which is the end of the deck 20, 20' in the direction perpendicular to the bridge axis X. The joining method of the balustrade 50 is not particularly limited. For example, the balustrade 50 may be joined by providing a receiving hole in the balustrade 25, 25' that opens at the top end of the balustrade 25, 25' and inserting a fixing bar extending downward from the balustrade 50 into the receiving hole. In order to solidify the balustrade 50 and the balustrade 25, 25', for example, non-shrink mortar M is filled in the gap between the balustrade 50 and the balustrade 25, 25' (UFC waterproof layer 30, 30'). The balustrade 50 may be a cast-in-place concrete balustrade or a steel balustrade.

[0027] [UFC waterproof layer] 2 is a schematic vertical cross-sectional view of the deck 20 and the wall parapet 50 according to this embodiment. Note that the reference character R in the drawing indicates a reinforcing bar embedded in the concrete of the deck main body 21.

[0028] 2, the UFC waterproof layer 30 includes a deck slab top waterproof layer 31, a ground cover top waterproof layer 32, and a ground cover side waterproof layer 33. The deck slab top waterproof layer 31, the ground cover top waterproof layer 32, and the ground cover side waterproof layer 33 are preferably constructed using room temperature curing UFC.

[0029] The deck top waterproof layer 31 is formed so as to cover the entire upper surface of the deck main body 21. An extension portion 31A that extends downward is provided at the end of the deck top waterproof layer 31 on the side of the ground covering portion 25. The ground covering top waterproof layer 32 is formed so as to cover the entire upper surface of the ground covering portion 25.

[0030] The ground cover side waterproof layer 33 is formed in a plate shape that covers the entire side of the ground cover part 25 facing the road. The ground cover side waterproof layer 33 comprises a vertical plate waterproof part 33A extending in the substantially vertical direction Z, and an inclined plate waterproof part 33B extending obliquely at a predetermined angle from the upper end of the vertical plate waterproof part 33A. The vertical plate waterproof part 33A and the inclined plate waterproof part 33B are formed seamlessly as a single unit. The predetermined angle is not particularly limited, but is set to an angle greater than 90 degrees so that the upper end of the inclined plate waterproof part 33B, i.e., the top end of the ground cover part 25, is higher than the vertical rise part of the ground cover part 25.

[0031] The upper end side of the inclined plate waterproof part 33B protrudes upward from the ground cover part 25. Hereinafter, the part 33D of the inclined plate waterproof part 33B protruding upward from the ground cover part 25 is referred to as the "upper protruding part". The road side end face of the ground cover top end waterproof layer 32 is in surface contact with the upper protruding part 33D of the inclined plate waterproof part 33B without any gaps. In this way, by making the end face of the ground cover top end waterproof layer 32 surface contact with the upper protruding part 33D of the inclined plate waterproof part 33B without any gaps, it is possible to reliably prevent water, etc. from entering through the joint between the inclined plate waterproof part 33B and the ground cover top end waterproof layer 32. In other words, deterioration of the ground cover part 25 due to the intrusion of chloride ions contained in the antifreeze agent and water leakage is effectively suppressed.

[0032] The lower end side of the vertical plate waterproof part 33A extends downward further than the ground covering part 25 and protrudes into the deck body part 21. Hereinafter, the part 33C of the vertical plate waterproof part 33A that protrudes into the deck body part 21 is referred to as the "lower protruding part." The end face of the extension part 31A provided at the end part of the deck top end waterproof layer 31 is in surface contact with the lower protruding part 33C of the vertical plate waterproof part 33A without any gaps.

[0033] Incidentally, the vicinity of the joint between the vertical plate waterproof part 33A and the deck top waterproof layer 31 is a water conduit for road surface drainage, and is prone to deformation due to water leakage from the ground cover rising part and around the drainage basin. In this embodiment, the extension part 31A is formed to be expanded in the vertical direction Z more than other parts of the deck top waterproof layer 31. That is, it is configured so that a large contact area can be secured between the lower protruding part 33C of the vertical plate waterproof part 33A and the end face of the extension part 31A. This makes it possible to reliably prevent water, etc. from entering through the joint between the deck top waterproof part 31 and the ground cover side waterproof layer 33. That is, deterioration of the deck main body part 21 and the ground cover part 25 due to the infiltration of chloride ions contained in the antifreeze agent and water leakage is effectively suppressed.

[0034] [Connection] Fig. 3(A) is a schematic vertical cross-sectional view of a connection portion that connects each deck slab according to this embodiment in the bridge axis direction Y. Fig. 3(B) is a schematic perspective view of the connection portion.

[0035] As shown in FIG. 3, each deck 20, 20' is connected by driving a connection UFC 40 between them. Specifically, the connection UFC 40 is driven into the space S1 between the deck body parts 21, 21', the space S2 between the ground cover parts 25, 25', the space S3 between the deck top waterproof layer 31, 31', the space S4 between the ground cover top waterproof layer 32, 32', and the space S5 between the ground cover side waterproof layer 33, 33'. That is, the connection UFC 40 is configured to function as a waterproof layer integrally with the deck top waterproof layer 31, 31', the ground cover top waterproof layer 32, 32', and the ground cover side waterproof layer 33, 33. This makes it possible to effectively prevent water, etc. from entering the deck body part 21 and the ground cover part 25 from the connection part of each deck 20, 20' during the service period.

[0036] According to the embodiment described above in detail, the floor slab 20, 20' of the secondary concrete product has the floor slab main body 21, 21' and the ground cover portion 25, 25' formed integrally therewith. The floor slab main body 21, 21' and the ground cover portion 25, 25' are provided with the UFC waterproof layer 30, 30'. The UFC waterproof layer 30, 30' is formed on the upper surface of the floor slab main body 21, 21', the upper surface of the ground cover portion 25, 25', and the side surface of the ground cover portion 25, 25' facing the road, and is configured so that the upper surface of the floor slab main body 21, 21' and the upper surface and side surface of the ground cover portion 25, 25' are entirely covered by the UFC waterproof layer 30, 30'.

[0037] In other words, in construction work for new decks or replacement work, the construction can be completed without performing waterproofing work by only performing the deck installation process (step S100 in Figure 4) in which the decks 20, 20' transported from a factory or the like to the construction site are installed on the main girders 90, the deck connection process (step S200 in Figure 4) in which connecting UFCs 40 are driven between each deck slab 20, 20' to connect them in the bridge axis direction Y, and the wall parapet installation process (step S300 in Figure 4) in which wall parapets 50 are installed on the ground covering portions 25, 25' of the deck slabs 20, 20'.

[0038] As a result, the deck 20, 20' according to this embodiment can reliably shorten the construction period and effectively reduce construction costs compared to the case where a conventional waterproof layer using a sheet-based or coating-based waterproofing material is constructed on-site. In addition, since the UFC waterproof layer 30, 30' is constructed in a factory as a secondary concrete product, there is no risk of poor construction on-site, as there was with the conventional waterproof layer. In addition, since construction can be performed even in rainy or humid weather, delays in construction due to bad weather can be prevented.

[0039] In addition, in the replacement work of the deck, after removing the existing deck, the work can be completed in only the three steps shown in Figure 4, so lane restrictions and road closures associated with the work can be limited to nighttime only. In other words, it is possible to effectively reduce the impact on the surrounding area due to traffic restrictions. In addition, while the conventional waterproof layer needs to be reapplied every time the pavement is replaced, the UFC waterproof layer 30, 30' can be used continuously even after the pavement replacement work is completed. In other words, it is possible to reliably reduce the construction period and construction costs of the pavement replacement work.

[0040] [Manufacturing method] Next, a manufacturing method for the deck slab 20 according to this embodiment will be described with reference to Figs.

[0041] 5, the first step is to cast UFC into a predetermined formwork to construct a plate-shaped ground cover side waterproof layer 33. Once the UFC of the ground cover side waterproof layer 33 has been cast, the process proceeds to the second step before the UFC completely hardens.

[0042] In the second step shown in Fig. 6, before the UFC completely hardens, green cut treatment is performed using pressurized water and a brush on the surface of the ground cover side waterproof layer 33. The green cut treatment is a process performed to remove laitance that occurs on the joint surface.

[0043] In this embodiment, the green cut treatment is applied to surface A1 where the ground cover side waterproof layer 33 comes into contact with the deck slab top waterproof layer 31, surface A2 where the ground cover side waterproof layer 33 comes into contact with the deck cover top waterproof part 32, and surface A3 where the ground cover side waterproof layer 33 comes into contact with the deck slab main body part 21 and the ground cover part 25. In this way, by applying the green cut treatment to the ground cover side waterproof layer 33, the adhesion of the ground cover side waterproof layer 33 is improved, and it is possible to reliably improve the waterproof performance. Once the green cut treatment has been performed, proceed to the third step.

[0044] In the third step shown in Figure 7, the previously constructed ground cover side waterproof layer 33 is used as a floating formwork, and ordinary concrete of a specified mix is ​​poured to integrally construct the deck slab main body 21 and the ground cover 25. For convenience, the illustration does not include the reinforcing bars embedded in the deck slab main body 21 and the ground cover 25. Once the ordinary concrete that constructs the deck slab main body 21 and the ground cover 25 has been poured, the process proceeds to the fourth step while the ordinary concrete is still fresh.

[0045] In the fourth step shown in Fig. 8, the deck top waterproof layer 31 is constructed by pouring UFC on the upper surface of the deck main body 21, and the ground cover top waterproof layer 32 is constructed by pouring UFC on the upper surface of the ground cover portion 25. The order in which the UFC for the deck top waterproof layer 31 and the ground cover top waterproof layer 32 are poured is not limited. The timing for pouring the UFC is when the ordinary concrete of the deck main body 21 and the ground cover portion 25 that serve as the base is fresh. This makes it possible to effectively improve the integrity of the deck top waterproof layer 31 and the ground cover top waterproof layer 32, which are made of UFC, and the deck main body 21 and the ground cover portion 25, which are made of ordinary concrete.

[0046] Once the fourth step is completed, curing is performed for a predetermined period of time, and the manufacture of the deck 20 is completed. In this embodiment, since room temperature curing type UFC is used, curing can be performed in the same manner as for the ordinary concrete used in the deck main body 21 and the ground covering portion 25. In other words, it is possible to effectively improve the productivity of the deck 20.

[0047] [others] The present disclosure is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit of the present disclosure.

[0048] For example, in the above embodiment, the UFC waterproof layer 30 has been described as including the ground cover top end waterproof layer 32, but as shown in Fig. 9, the UFC waterproof layer 30 can also be configured to include a deck slab top end waterproof layer 31 and a ground cover side surface waterproof layer 33, omitting the ground cover top end waterproof layer 32. In this case, it is desirable to fill the joint between the ground cover part 25 and the wall balustrade 50 with a water-stopping material 11. Providing the water-stopping material 11 makes it possible to effectively prevent water leakage from the joint.

[0049] Examples of the water-stopping material 11 include modified silicone water-stopping materials and epoxy resin water-stopping materials. The water-stopping material 11 may be filled in the road-side end of the joint between the ground cover portion 25 and the wall balustrade 50. It is also preferable to form a protective layer 12 of mortar or the like that covers the end face of the water-stopping material 11 at the end of the joint between the ground cover portion 25 and the wall balustrade 50 that is closer to the road than the water-stopping material 11. By providing the protective layer 12, it is possible to effectively prevent the water-stopping material 11 from deteriorating due to ultraviolet rays during the service period. As the mortar that forms the protective layer 12, it is preferable to use, for example, polymer cement mortar that can be applied with a trowel.

[0050] In the above embodiment, the manufacturing method of the deck 20 may also be such that the order of the third step shown in Fig. 7 and the fourth step shown in Fig. 8 is interchangeable. That is, the deck main body 21 and the ground cover portion 25 may be constructed after the deck top waterproof layer 31 and the ground cover top waterproof layer 32 are constructed.

[0051] In addition, in the above embodiment, it has been described that an extension portion 31A is provided at the end of the deck top waterproof layer 31, but as shown in Figure 10, the deck top waterproof layer 31 can also be formed without the extension portion 31A. [Explanation of symbols]

[0052] 20,20'... Deck slab, 21,21'... Deck slab body, 22,22'... Shear key, 23,23'... Deformed steel bar, 24... Concrete joint, 25,25'... Ground cover, 30,30'... UFC waterproof layer, 31... Deck top waterproof layer, 31A... Extension, 32... Ground cover top waterproof layer, 33... Ground cover side waterproof layer, 33A... Vertical plate waterproof part, 33B... Sloping plate waterproof part, 37,37'... Convex part, 40... Connection UFC, 50... Wall parapet, 90... Main girder, 91... Upper flange, M... Non-shrink mortar

Claims

1. A deck body portion, A ground cover part that is integrally provided at an end part of the deck body in a direction perpendicular to the bridge axis and protrudes upward from the deck body, A deck top waterproof layer formed of ultra-high strength fiber reinforced concrete covering the upper part of the deck main body; and a waterproof layer on the side of the ground cover formed of ultra-high strength fiber reinforced concrete covering the side of the ground cover on the road side. A deck characterized by:

2. The deck according to claim 1, The ground cover further includes a waterproof layer formed of ultra-high strength fiber reinforced concrete covering the upper part of the ground cover. A deck characterized by:

3. The deck according to claim 1 or 2, An extension portion is provided at the end portion of the deck top waterproof layer on the side of the ground covering portion, and the end face of the extension portion is in surface contact with the side face of the lower end side of the ground covering side waterproof layer. A deck characterized by:

4. A deck connection method for connecting the decks according to claim 1 or 2 in the bridge axis direction, By pouring ultra-high strength fiber reinforced concrete between the ends of a pair of decks facing each other in the bridge axis direction, the pair of decks are connected to each other in the bridge axis direction, and the ultra-high strength fiber reinforced concrete poured between the ends functions as a waterproof layer. A deck slab connection method characterized by the above.

5. A method for manufacturing a deck according to claim 1, A first step of constructing the above-mentioned ground cover side waterproof layer in a plate shape by pouring ultra-high strength fiber reinforced concrete into a predetermined formwork; A second step of constructing the deck body and the ground cover integrally by pouring concrete into the plate-shaped ground cover side waterproof layer as a floating formwork; A third step of constructing the deck top waterproof layer by pouring ultra-high strength fiber reinforced concrete on the upper part of the constructed deck main body. A method for manufacturing a deck slab.

6. The method for manufacturing a deck according to claim 5, Between the first step and the second step, a green cut process is performed on at least the surface of the plate-shaped ground cover side waterproof layer that will be in contact with the deck body, the ground cover, and the deck top waterproof layer. A method for manufacturing a deck slab.

7. The method for manufacturing a deck according to claim 5 or 6, In the third step, a waterproof layer is constructed on the top of the ground cover by pouring ultra-high strength fiber reinforced concrete on top of the ground cover, Between the first step and the second step, a green cut treatment is performed on the surface of the plate-shaped ground cover side waterproof layer that will come into contact with the ground cover top waterproof layer. A method for manufacturing a deck slab.

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