Deck installation method using steel frames and reinforcement structure for concrete decks

Abstract

To provide a deck slab installation method using a steel frame and a reinforcement structure for a concrete deck slab, which can efficiently complete deck slab installation work for an embankment platform in a certain range near an obstacle only by working at night when trains are not running. [Solution] A deck installation method for installing a new concrete deck on an embankment platform on which an obstacle has been installed comprises a new precast deck installation process for installing a new precast deck on the track side of the obstacle, a steel frame installation process for joining and installing a steel frame near the obstacle on the opposite side of the track from the installed new precast deck, and a filler filling process for filling the installed steel frame with filler.

Description

[Technical Field]

[0001] The present invention relates to a slab installation method using steel frames for embankment platforms and a reinforcement structure for concrete slabs, and more particularly to a slab installation method using steel frames for embankment platforms and a reinforcement structure for concrete slabs when installing and reinforcing a new concrete slab on an embankment platform in conjunction with the installation of platform doors. [Background technology]

[0002] In recent years, construction work has been carried out to install platform doors on embankment-style station platforms, where the platform foundation is made up of soil piled up and compacted on top of the ground. In conjunction with this platform door installation work, platform door units are installed near the edge of the overhanging platform floor, which is heavy and subject to repeated wind loads when trains pass. Therefore, it is necessary to carry out deck installation work to build a deck that can withstand the repeated loads transmitted through the platform doors, such as by installing a new precast concrete deck.

[0003] Conventionally, in the deck installation work associated with such platform door installation work, as shown in Figures 11 and 12, the concrete deck to which the platform door unit 50 is fixed is a pre-manufactured PCa deck 10 (precast deck) approximately measuring width W1 = 3.1 m × depth D1 = 1.5 m × thickness T1 = 0.15 m, which is carried in on a rail-road dump truck, lifted by a lifting machine such as a rail-road crane, and installed on the girder 11 or embankment E.

[0004] However, each PCa deck slab, measuring 3.1 m wide and 1.5 m deep, weighs 1.6 tons, making it extremely heavy. This limited the number of slabs that could be loaded onto a road-rail dump truck, and it was obviously impossible to install them manually. Therefore, as mentioned above, they had to be lifted and installed using a crane, which required time. This meant that a certain amount of work could not be completed at night, when trains were not running, making installation difficult. Furthermore, as shown in Figures 11 and 12, if there were obstacles such as pillars C1, pre-preparation work was required around the obstacles (pillars), such as cutting the PCa deck slab 10 in advance or fabricating a custom-shaped PCa deck slab 10 to avoid the obstacle.

[0005] For example, Patent Document 1 proposed by the applicant discloses a platform door installation structure 100 for a station platform in which a retaining wall 2 extends along the extension direction of the station platform and the retaining wall 2 supports an embankment 3, the platform door installation structure comprising an embankment modification layer 10 in which the upper portion of the embankment 3 is compacted so that the upper surface thereof increases frictional resistance, a shoe 20 fixed to the upper end surface of the retaining wall 2, and a floor slab 30 whose underside is disposed with its underside pressed against the embankment modification layer 10 and the shoe 20, a platform door unit 40 to be installed on the floor slab 30, and the floor slab 30 on which the platform door unit 40 is installed is configured to distribute the load of the platform door unit 40 towards the center of the station platform (see claim 1 of Patent Document 1, paragraphs

[0021] to

[0047] of the specification, Figures 1 to 12, etc.).

[0006] The platform door installation structure described in Patent Document 1 is said to make it relatively easy to install platform doors on embankment-type station platforms. However, the floor slab 30 of the platform door installation structure described in Patent Document 1 is a PCa deck slab measuring 3.1 m wide and 1.35 m deep, which is about the same size as the conventional deck slab installation method described above, and the above-mentioned problems remain unresolved.

[0007] Furthermore, as a prior art using a steel frame, Patent Document 2 discloses a method in which peripheral compartment members 31, 31 that form two opposing sides on a construction surface 21 are fixed, at least one plate-like member 41 is arranged between the peripheral compartment members 31, 31 from one end side of the peripheral compartment members 31, 31 to cover the construction surface 21, and at least one deck slab 51 is arranged on the upper surface of the peripheral compartment members 31, 31 from one end side of the peripheral compartment members 31, 31 and fixed, and a foamed resin raw material is poured into the space formed between the construction surface 21 and the deck slab 51. A method for constructing a raised structure is disclosed in which the process of fixing the plate-like members 41 and the deck slab 51 and the process of filling the resin foam by injecting the foamed resin raw material constitute one cycle, and the cycle is repeated to fix the plate-like members 41 and the deck slab 51 in position and fill the resin foam 61 up to the other end of the peripheral partition members 31, 31 (see claim 4 in the scope of claims of Patent Document 2, paragraphs

[0036] to

[0052] of the specification, Figure 9, etc.).

[0008] The method for constructing a raised-height structure described in Patent Document 2 is said to be able to shorten the construction period and improve the construction process and work. However, the method for constructing a raised-height structure described in Patent Document 2 is only a construction method for raised-height structures when the entrance and exit of a newly introduced railway vehicle is located higher than the entrance and exit of the previous railway vehicle, and it cannot be applied to the deck installation method for reinforcing the concrete deck accompanying the installation of platform doors. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 7401958 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-61044 Summary of the Invention [Problem to be solved by the invention]

[0010] Therefore, the present invention has been devised in consideration of the above-mentioned problems, and its purpose is to provide a deck installation method using steel frames and a reinforcement structure for concrete decks that allows for the efficient completion of deck installation work for an embankment platform within a certain range near an obstacle, using only nighttime work when trains are not running. [Means for solving the problem]

[0011] The deck installation method using a steel frame according to the first invention is a deck installation method for installing a new concrete deck on an embankment platform on which an obstacle has been installed, and includes a new precast deck installation step of installing a new precast deck on the track side of the obstacle, and a steel frame installed near the obstacle on the opposite side of the track from the newly installed precast deck. The newly constructed precast deck and The method is characterized by comprising a steel frame installation process in which the steel frames are joined and installed, and a filler filling process in which the installed steel frames are filled with filler.

[0012] The deck installation method using steel frames according to the second invention is the same as that according to the first invention, except that in the steel frame installation step, a second row of steel frames is further installed on the opposite side of the track from the steel frames connected to the newly installed precast deck. Joined to the steel frame It is characterized by being installed.

[0013] The deck installation method using a steel frame according to the third invention is characterized in that, in the first invention, in the new precast deck installation process, a prestressed PPC deck is installed as the new precast deck.

[0014] The deck installation method using a steel frame according to the fourth invention is characterized in that, in the second or third invention, in the filler filling process, a concrete slab is inserted into the installed steel frame, and then a filler is filled into the gap between the concrete slab and the steel frame.

[0015] The reinforcement structure for a concrete floor slab according to the fifth invention is a reinforcement structure for a concrete floor slab of an embankment platform on which an obstacle is installed, in which a new precast floor slab is installed on the track side of the obstacle, and a steel frame is installed near the obstacle on the opposite side of the track of the new precast floor slab. The newly constructed precast deck The steel frame is joined together and filled with a filler material.

[0016] The reinforcement structure for a concrete deck according to the sixth invention is characterized in that, in the fifth invention, a second row of steel frames is connected to the opposite side of the tracks of the steel frames connected to the newly constructed precast deck.

[0017] The reinforcement structure for a concrete floor slab according to the seventh invention is characterized in that, in the fifth invention, the newly constructed precast floor slab is a PPC floor slab into which prestress has been introduced.

[0018] The reinforcement structure for a concrete floor slab according to the eighth invention is characterized in that, in the sixth or seventh invention, a concrete slab is inserted into the steel frame, and a filler material is filled in the gap between the concrete slab and the steel frame.

[0019] The reinforcement structure for a concrete floor slab according to the ninth invention is characterized in that, in the sixth invention, a shear stopper is attached to the bottom surface of the steel frame to prevent horizontal shear.

[0020] The reinforcement structure for a concrete deck according to the tenth invention is characterized in that, in the seventh invention, the PPC deck is fixed to the support beam on which it is placed and its horizontal movement is restricted, and no anti-slip material is attached to the bottom surface of the steel frame to prevent horizontal displacement. [Effects of the Invention]

[0021] According to the first to tenth inventions, the installation of the deck of the embankment platform within a certain range near the obstacle can be completed efficiently only during nighttime work when trains are not running, and the platform can be opened during the hours when trains are running, allowing passengers to board and disembark from the train.

[0022] In particular, according to the second and sixth inventions, the depth of the newly constructed precast deck slabs can be reduced to make them lighter, and the number of newly constructed precast deck slabs that can be loaded onto transport vehicles such as rail-road dump trucks can be increased, thereby improving transportation efficiency.

[0023] In particular, according to the third and seventh inventions, by changing to a PPC deck with prestressing, the installation area of ​​the steel frame can be reduced, the installation time of the steel frame can be shortened, and the overall construction time for the deck installation work can be shortened.

[0024] In particular, according to the fourth and eighth inventions, the volume of filler to be filled can be reduced depending on the volume of the concrete slab, thereby shortening the hardening time and further improving the work efficiency of deck installation work.

[0025] In particular, according to the ninth invention, a stopper material is attached to the bottom surface of the steel frame to prevent horizontal displacement, thereby preventing horizontal displacement at the interface between the embankment and the steel frame.

[0026] In particular, according to the tenth invention, the PPC deck is fixed to the support girders on which it is placed and its horizontal movement is restricted, so that the steel frame bolted directly to the PPC deck can be prevented from shifting horizontally at the interface with the embankment even without the need for a shear stopper. This makes it possible to reduce the manufacturing costs of the steel frame while preventing horizontal shifting. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a perspective view schematically showing a reinforcement structure for a concrete floor slab according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a vertical cross-sectional view schematically showing the reinforcement structure of the concrete floor slab of the same. [Figure 3] Figure 3 is a process explanatory diagram showing the new precast deck installation process using the deck installation method using the steel frame described above. [Figure 4]FIG. 4 is a process explanatory diagram showing the steel frame installation process of the deck slab installation method using the steel frame. [Figure 5] FIG. 5 is a process explanatory diagram showing the filler filling process of the deck slab installation method using the steel frame. [Figure 6] FIG. 6 is a perspective view schematically showing a reinforcement structure for a concrete floor slab according to a second embodiment of the present invention. [Figure 7] FIG. 7 is a vertical cross-sectional view schematically showing the reinforcement structure of the concrete floor slab in the same manner. [Figure 8] FIG. 8 is a process explanatory diagram showing the process of installing a new precast deck slab using the above-mentioned deck slab installation method using a steel frame. [Figure 9] FIG. 9 is a process explanatory diagram showing the steel frame installation process of the deck slab installation method using the steel frame. [Figure 10] FIG. 10 is a process explanatory diagram showing the filler filling process of the deck slab installation method using the steel frame. [Figure 11] FIG. 11 is a perspective view schematically showing a conventional reinforcement structure for a concrete floor slab. [Figure 12] FIG. 12 is a vertical cross-sectional view schematically showing a conventional reinforcement structure for a concrete deck. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, an embodiment of a concrete slab reinforcement structure and a slab installation method using a steel frame according to the present invention will be described in detail with reference to the drawings.

[0029] [First embodiment] <Reinforcement structure of concrete floor slab> First, a reinforcement structure 1 for a concrete floor slab according to a first embodiment of the present invention will be described with reference to Figures 1 to 5. Figure 1 is a perspective view that schematically shows the reinforcement structure 1 for a concrete floor slab according to the first embodiment of the present invention. Also, Figure 2 is a vertical cross-sectional view that schematically shows the reinforcement structure 1 for a concrete floor slab according to the first embodiment.

[0030] The concrete deck reinforcement structure 1 according to this embodiment is a concrete deck reinforcement structure that can withstand the repeated loads transmitted from the platform doors, with the aim of reinforcing the floor of an embankment platform when platform doors are installed. Note that an embankment platform refers to a typical station platform structure in which a retaining wall W made of blocks B such as concrete blocks, masonry blocks, or natural stone supports an embankment E made of earth and sand to prevent it from collapsing and flowing away, and the concrete deck that will become the platform is placed on top of the embankment E.

[0031] As shown in Figures 1 and 2, this concrete slab reinforcement structure 1 is composed of a PCa slab 2, which is a newly constructed precast slab to which a platform door unit 50, which is the housing (door pocket) that houses the sliding door of the platform door 5, is fixed, a steel frame 3 that is connected to the opposite side of the tracks of this PCa slab 2, and a filler material 4 that is filled into this steel frame 3. Note that the symbol R indicates the tracks R, and the symbol G indicates a support girder G that supports the lower part of the PCa slab 2 on the track side.

[0032] (PCa floor slab) The PCa slab 2 is a precast concrete slab in which reinforcing bars (not shown) made of deformed steel bars arranged in a grid pattern are arranged, and the concrete is poured and hardened in advance at a location other than the station platform, such as a factory. The PCa slab 2 in this embodiment is a precast slab with a width W2 = 3100 mm x depth D2 = 700 mm and a predetermined thickness (thickness T2 = approximately 150 mm) that can support the load of a crowd, etc.

[0033] As shown in Figures 1 and 2, this PCa deck slab 2 is installed on the support girder and embankment E on the track side of the support pillar C1, avoiding the obstacle of the pillar C1 supporting the roof of the station platform.

[0034] As shown in FIG. 2, on the opposite side of the PCa deck 2 from the track, a female threaded insert 2a is embedded in the concrete for bolting to the steel frame 3.

[0035] In the concrete slab reinforcement structure 1 according to this embodiment, a support girder G made of H-shaped steel is installed on the retaining wall W below the track side of the PCa slab 2 to support the load acting on the PCa slab 2 via the platform door unit 50. In addition, a shoe S made of rubber is interposed between this support girder G and the PCa slab 2, and is configured to be able to support the load by following the bending deformation of the PCa slab 2 due to the wind load acting on the platform door unit 50. However, the support girder G is not essential, and the PCa slab 2 may be installed directly on the embankment E (embankment improvement layer).

[0036] And, under the PCa deck 2 on the opposite side of the tracks, in order to improve the support strength per area of ​​the embankment E, either cement, lime or other ground improvement materials that solidify the soil on top of the embankment E are mixed in and solidified, or a resin restraining material such as Ground Cell (registered trademark) that restrains the movement of the soil is placed between the soil and compacted to form an embankment improvement layer Ea.

[0037] As shown in FIG. 2, tile materials T such as guide blocks (tactile paving blocks) and non-slip tiles are adhered and fixed to the upper surface of the PCa floor slab 2.

[0038] (steel frame) The steel frame 3 is a rectangular box made of hot-dip galvanized steel plate, approximately 300 mm square in plan view, with an open top. It is bolted to the insert 2a of the PCa deck 2 and is filled with filler material 4 to become one with the PCa deck 2, forming a component that makes up the station platform. The steel frame 3 is approximately the same thickness as the PCa deck 2 to which it is connected. However, the height of the top end of the steel frame 3 is set to be slightly less than 150 mm so that it will not be exposed after the filler material 4 is filled.

[0039] Furthermore, in the steel frames 3 according to this embodiment, the first row of steel frames 3 are bolted to the inserts 2a of the PCa deck 2, and a second row of steel frames 3 are bolted to the opposite side of the tracks from the first row of steel frames 3. By increasing the installation area of ​​the steel frames 3, the depth (area) of the newly constructed PCa deck 2 can be reduced to reduce its weight, and more PCa decks 2 can be loaded onto a transport vehicle, improving transportation efficiency.

[0040] 1 and 2, a plurality of anti-slip materials 3a such as deformed steel bars (reinforcing bars) are fixed by welding or the like to the underside of the steel frame 3 to prevent the steel frame 3 from shifting horizontally at the interface with the embankment modification layer Ea. Of course, the anti-slip materials are not limited to deformed steel bars, and any material that can protrude downward from the underside of the steel frame 3 and resist horizontal forces will do.

[0041] (filling material) The filler 4 can be any time-hardening material such as mortar that hardens after a certain period of time, but it is preferable to use non-shrinkage mortar so that gaps do not form in the steel frame 3 due to drying shrinkage when hardening.

[0042] Furthermore, in the concrete slab reinforcement structure 1 according to this embodiment, it is preferable that after the concrete slab 6 is inserted into the steel frame 3, the gap between the concrete slab 6 and the steel frame 3 is filled with filler 4. This is because the volume of the filler 4 to be filled can be reduced depending on the volume of the concrete slab 6, thereby shortening the hardening time of the filler 4.

[0043] <Deck installation method using steel frames> Next, a deck slab installation method using a steel frame according to a first embodiment of the present invention will be described with reference to Figures 3 to 5. A case where the aforementioned reinforcement structure 1 for a concrete deck is constructed using the deck slab installation method using a steel frame according to the first embodiment will be described as an example.

[0044] First, in the deck installation method using a steel frame according to this embodiment, an existing floor removal step is carried out to remove the platform floor, which has tiles (not shown) installed on the embankment via mortar or the like.

[0045] (New precast deck installation process) Next, in the deck installation method using a steel frame according to this embodiment, a new precast deck installation process is carried out in which a new precast deck, PCa deck 2, is installed on the track side of the support pillar C1, which is an obstacle in the area where the existing concrete deck Cd has been removed, as shown in Figure 3. Figure 3 is a process explanatory diagram showing the new precast deck installation process in the deck installation method using a steel frame according to this embodiment.

[0046] Here, the PCa slab 2 to be installed as the new precast slab in this process is the precast slab with the aforementioned width W2 = 3100 mm x depth D2 = 700 mm x thickness T2 = 150 mm.

[0047] Although pillar C1 has been used as an example of an obstacle, obstacles are not limited to pillars C1 that support the roof of a station platform, but also include structures that impede the installation of the PCa deck 2, such as those that penetrate the thickness of the PCa deck 2 vertically.

[0048] (Steel frame installation process) Next, in the deck installation method using a steel frame according to this embodiment, a steel frame installation step is carried out in which a steel frame is joined and installed near the support column C1 on the opposite side of the track of the installed PCa deck 2, as shown in Figure 4. Figure 4 is a process explanatory diagram showing the steel frame installation step of the deck installation method using a steel frame according to this embodiment.

[0049] Furthermore, in the steel frame installation process of the deck installation method using steel frames according to the first embodiment, a second row of steel frames 3 is installed on the opposite side of the tracks from the steel frames 3 connected to the PCa deck 2. By increasing the installation range of the steel frames 3, the depth of the PCa deck 2 can be reduced, reducing the weight of the PCa deck 2 and increasing the number of PCa decks 2 that can be loaded onto a transport vehicle such as a rail-road dump truck, thereby improving transportation efficiency.

[0050] (Filling material filling process) Next, in the deck slab installation method using a steel frame according to this embodiment, a filler filling step is carried out in which filler material 4 is filled into the installed steel frame 3, as shown in Fig. 5. Fig. 5 is a process explanatory diagram showing the filler filling step in the deck slab installation method using a steel frame according to this embodiment.

[0051] In the filler filling process of the deck installation method using a steel frame according to the first embodiment, a concrete slab 6 is inserted into the steel frame 3, and then a filler 4 made of non-shrink mortar or the like is filled into the gap between the concrete slab 6 and the steel frame 3. This is because the volume of the filler 4 to be filled can be reduced based on the volume of the concrete slab 6, thereby shortening the hardening time of the filler 4, and enabling a covering plate to be installed on the steel frame 3 and the filler 4 in a short time, thereby shortening the time until the road is opened to traffic.

[0052] With the completion of this process, the deck installation work using the deck installation method using the steel frame according to this embodiment is completed.

[0053] According to the concrete deck reinforcement structure 1 according to the first embodiment and the deck installation method using the steel frame according to the first embodiment described above, the deck installation work for the embankment platform can be completed efficiently in a certain range near the obstructing support pillar C1 only during nighttime work when trains are not running. This allows the platform to be opened during train operating hours, allowing passengers to board and disembark the train.

[0054] Furthermore, according to the concrete deck reinforcement structure 1 of the first embodiment and the deck installation method using the steel frame of the first embodiment, two rows of steel frames 3 are installed, which reduces the depth of the newly constructed precast deck, the PCa deck 2, making it lighter, and increases the number of PCa decks 2 that can be loaded onto a transport vehicle such as a rail-road dump truck, improving transportation efficiency.

[0055] Furthermore, according to the concrete slab reinforcement structure 1 of the first embodiment and the slab installation method using the steel frame of the first embodiment, the concrete slab 6 is inserted into the steel frame 3 and then filled with filler 4, so the volume of the filler 4 to be filled is reduced depending on the volume of the concrete slab 6, thereby shortening the hardening time and further improving the work efficiency of the slab installation work.

[0056] [Second embodiment] <Reinforcement structure of concrete floor slab> Next, a reinforcement structure 1' for a concrete floor slab according to a second embodiment of the present invention will be described with reference to Figures 6 and 7. Figure 6 is a perspective view schematically showing the reinforcement structure 1' for a concrete floor slab according to the second embodiment of the present invention. Also, Figure 7 is a vertical cross-sectional view schematically showing the reinforcement structure 1' for a concrete floor slab according to the second embodiment.

[0057] The difference between the concrete floor slab reinforcement structure 1' according to the second embodiment and the concrete floor slab reinforcement structure 1 according to the first embodiment described above is mainly that the newly constructed precast floor slab is a PPC floor slab 2' with a depth D2' = 995 mm, rather than the aforementioned PCa floor slab 2 with a depth D2 = 700 mm. Therefore, the same components as those in the concrete floor slab reinforcement structure 1' and the concrete floor slab reinforcement structure 1 are given the same symbols, and detailed explanations will be omitted.

[0058] As shown in Figures 6 and 7, the reinforcement structure 1' for the concrete deck is composed of a PPC deck 2', which is a newly constructed precast deck to which the platform door unit 50, which is the housing (door pocket) part that stores the sliding door of the platform door 5, is fixed, a steel frame 3 connected to the opposite side of the tracks of this PPC deck 2', and a filling material 4 filled into this steel frame 3.

[0059] (PPC floor slab) The PPC deck 2' is a precast prestressed concrete deck in which reinforcing bars (not shown) made of deformed steel bars arranged in a grid pattern are arranged, and prestress is introduced to the high-strength reinforcing bars along the longitudinal direction (width direction: parallel to the tracks) using a pretensioning method.

[0060] Here, the pretensioning method refers to a prestressing method in which high-strength reinforcing bars such as PC steel bars are placed between two reaction stands (stands that hold the reinforcing bars) before assembling the steel bars and formwork of the precast deck slab, and the bars are tensioned before the concrete is poured, and the tension is gradually reduced after the concrete is poured to introduce prestress into the concrete.

[0061] Furthermore, the PPC slab 2' according to this embodiment is a precast slab with a width W2 = 3100 mm, a depth D2' = 995 mm, and a thickness T2' = 120 mm. However, the thickness T2' of the PPC slab 2' is an example, and it is thinner than the aforementioned PCa slab 2, achieving a lighter weight per area, and even if the depth is longer than the depth D2 of the PCa slab 2, it is sufficient as long as the weights of the PPC slab 2' and the PCa slab 2 are approximately the same.

[0062] By making the depth D2' of the PPC deck 2' longer than the depth D2 of the PCa deck 2 and making the area of ​​the PPC deck 2' larger than the area of ​​the PCa deck 2, the installation area of ​​the steel frame 3 is reduced compared to the concrete deck reinforcement structure 1, shortening the installation time of the steel frame 3 and thereby shortening the overall construction time for the deck installation work.

[0063] Also, as shown in Figure 7, on the opposite side of the tracks of the PPC deck 2', a female threaded insert 2a' is embedded in the concrete for bolt connection to the steel frame 3, similar to the PCa deck 2 described above.

[0064] Unlike the PCa deck 2, the PPC deck 2' is fixed to the support girder G via hook bolts FB, and is integrated with the support girder G, so that horizontal movement is restricted.

[0065] (steel frame) The steel frame 3 has almost the same configuration as the aforementioned steel frame 3, and is made of hot-dip galvanized steel plate, and is a rectangular box in plan view with an open top surface and approximately 300 mm square. This steel frame 3 is bolted to the insert 2a' of the aforementioned PPC deck 2', and is filled with filler material 4 to become one with the PPC deck 2', forming a component that constitutes the station platform. The height of this steel frame 3 is set to be slightly less than 120 mm so that its upper end will not be exposed after the filler material 4 is filled.

[0066] However, in this embodiment, only the first row of steel frames 3 are bolted to the inserts 2a' of the PPC deck slab 2', and the second row of steel frames 3 are not bolted to the opposite side of the tracks from the first row of steel frames 3. As mentioned above, by reducing the installation area of ​​the steel frames 3, the installation work of the steel frames 3 can be shortened, thereby shortening the overall construction time for installing the deck slab.

[0067] No shear stopper 3a (see Figures 1 and 2) is attached to the underside of the steel frame 3, and the PPC deck 2' is fixed to the support girder G with hook bolts FB to form an integrated structure. Moreover, in the steel frame 3 according to this embodiment, the first row of steel frame 3 is directly bolted to the insert 2a' of the PPC deck 2'. This eliminates the risk of the steel frame 3 shifting horizontally at the interface with the embankment modification layer Ea. This allows for reduced manufacturing costs for the steel frame 3.

[0068] (filling material) As mentioned above, the filler 4 can be any time-hardening material such as mortar that hardens after a certain period of time, but it is preferable to use non-shrinking mortar so that gaps do not form in the steel frame 3 due to drying shrinkage during hardening.

[0069] Furthermore, in the concrete floor slab reinforcement structure 1' of this embodiment, as with the concrete floor slab reinforcement structure 1, after inserting a concrete slab 6 into a steel frame 3, filler material 4 may be filled into the gap between the concrete slab 6 and the steel frame 3.

[0070] <Deck installation method using steel frames> Next, a deck slab installation method using a steel frame according to a second embodiment of the present invention will be described with reference to Figures 8 to 10. The deck slab installation method using a steel frame according to the second embodiment of the present invention will be described by taking as an example the case of constructing the aforementioned concrete deck slab reinforcement structure 1'.

[0071] In the deck installation method using a steel frame according to the second embodiment, as in the deck installation method using a steel frame according to the first embodiment, an existing floor removal process is carried out to remove the existing platform floor.

[0072] (New precast deck installation process) Next, in the deck installation method using a steel frame according to this embodiment, a new precast deck installation process is carried out in which a new precast deck, a PPC deck 2', is installed on the track side of the support column C1 in the section where the existing deck has been removed, as shown in Figure 8. Figure 8 is a process explanatory diagram showing the new precast deck installation process in the deck installation method using a steel frame according to this embodiment.

[0073] Here, the PPC deck 2' to be installed as the new precast deck in this process is a precast prestressed concrete deck with prestress introduced using the pretensioning method, with the aforementioned dimensions of width W2 = 3100 mm x depth D2' = 995 mm x thickness T2' = 120 mm.

[0074] The depth D2' of the PPC deck 2' is longer than the depth D2 of the PCa deck 2. This makes it possible to reduce the installation area of ​​the steel frame 3 by making the area of ​​the PPC deck 2' larger than the area of ​​the PCa deck 2. As a result, the installation time of the steel frame 3 can be shortened, and the overall construction time for installing the deck can be shortened.

[0075] (Steel frame installation process) Next, in the deck slab installation method using a steel frame according to this embodiment, a steel frame installation step is carried out in which a steel frame 3 is joined and installed near the support column C1 on the opposite side of the track of the newly installed precast deck slab, as shown in Figure 9. Figure 9 is a process explanatory diagram showing the steel frame installation step of the deck slab installation method using a steel frame according to this embodiment.

[0076] (Filling material filling process) Next, in the deck slab installation method using a steel frame according to this embodiment, a filler filling step is carried out in which filler 4 is filled into the installed steel frame 3, as shown in Fig. 10. Fig. 10 is a process explanatory diagram showing the filler filling step in the deck slab installation method using a steel frame according to this embodiment.

[0077] In the filler filling process of the deck slab installation method using a steel frame according to the second embodiment, a concrete slab 6 is inserted into the steel frame 3, and then a filler 4 made of non-shrink mortar or the like is filled into the gap between the concrete slab 6 and the steel frame 3. The volume of the concrete slab 6 can reduce the amount of filler 4 to be filled. This shortens the hardening time of the filler 4, allowing a covering plate to be installed on the steel frame 3 and the filler 4 in a short time, shortening the time until the road is opened to traffic.

[0078] However, in this step, the steel frame 3 may be entirely filled with the filler 4 without inserting the concrete slab 6 into the steel frame 3 .

[0079] According to the concrete deck reinforcement structure 1' according to the second embodiment and the deck installation method using the steel frame according to the second embodiment described above, the deck installation work for the embankment platform can be completed efficiently in a certain range near the obstructing support pillar C1 only during nighttime work when trains are not running. This allows the platform to be opened during operating hours, allowing passengers to board and disembark trains.

[0080] Furthermore, according to the second embodiment of the concrete slab reinforcement structure 1' and the slab installation method using the steel frame of the second embodiment, by installing a PPC slab 2' into which prestress has been introduced, the installation area of ​​the steel frame 3 can be made smaller than that of the concrete slab reinforcement structure 1, and the installation time of the steel frame 3 can be shortened, thereby shortening the overall construction time for the slab installation work.

[0081] The concrete slab reinforcement structure 1 according to the first embodiment, the slab installation method using a steel frame according to the first embodiment, the concrete slab reinforcement structure 1' according to the second embodiment, and the slab installation method using a steel frame according to the second embodiment have been described in detail above, but the embodiments described above or shown in the drawings are merely specific embodiments for carrying out the present invention. Therefore, the technical scope of the present invention should not be interpreted in a limited manner based on these.

[0082] In particular, the slab installation method according to the embodiment has been exemplified as a case in which the existing platform floor is removed, but it goes without saying that the slab installation method according to the present invention can also be applied when extending, relocating, or constructing a new platform. [Explanation of symbols]

[0083] 1,1': Reinforcement structure of concrete slab 2: PCa floor slab 2':PPC floor slab 2a, 2a': Insert 3: Steel frame 3a: Shear stopper 4: Filling material 5: Platform doors 50: Platform door unit 6: Concrete slab 10: PCa floor slab 11: digit C1: Pillar (obstacle) Cd: Concrete deck G: Support beam S: Shoes FB: Hook bolt W: Retaining wall B: Block letters E: Embankment Ea: Embankment improvement layer R: Railroad tracks T: Tile material

Claims

1. A slab installation method for installing a new concrete slab on an embankment platform where an obstacle has been installed. a new precast deck installation process in which a new precast deck is installed on the railroad track side of the obstacle; a steel frame installation process of joining a steel frame to the newly installed precast deck and installing the steel frame near the obstacle on the opposite side of the track from the newly installed precast deck; A filler filling process is provided for filling the installed steel frame with filler. A deck installation method using a steel frame characterized by:

2. In the steel frame installation process, a second row of steel frames is installed on the opposite side of the track from the steel frame connected to the newly installed precast deck by joining the steel frame to the steel frame. A deck slab installation method using the steel frame according to claim 1.

3. In the new precast floor slab installation process, a prestressed PPC floor slab is installed as a new precast floor slab. A deck slab installation method using the steel frame according to claim 1.

4. In the filler filling step, a concrete slab is inserted into the installed steel frame, and then a filler is filled into the gap between the concrete slab and the steel frame. A deck slab installation method using the steel frame according to claim 2 or 3, characterized in that:

5. A reinforcement structure for a concrete floor slab of an embankment platform on which an obstacle is installed, A new precast deck was installed on the track side of the obstacle. A steel frame is joined to the new precast deck near the obstacle on the opposite side of the track from the new precast deck, The steel frame is filled with a filler material. A reinforced concrete deck structure characterized by:

6. A second row of steel frames is connected to the opposite side of the track of the steel frames connected to the newly constructed precast deck.

6. The reinforcement structure for a concrete floor slab according to claim 5,

7. The new precast deck is a prestressed PPC deck.

6. The reinforcement structure for a concrete floor slab according to claim 5,

8. A concrete slab is inserted into the steel frame, and a filler material is filled in the gap between the concrete slab and the steel frame.

8. The reinforcement structure for a concrete floor slab according to claim 6 or 7, characterized in that:

9. The bottom surface of the steel frame is fitted with a stopper to prevent horizontal displacement.

7. The reinforcement structure for a concrete floor slab according to claim 6,

10. The PPC deck is fixed to the support beam on which it is placed and its horizontal movement is restricted. The bottom surface of the steel frame is not fitted with a shear stopper to prevent horizontal shear.

8. The reinforcement structure for a concrete floor slab according to claim 7,

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