Method for constructing precast concrete bridge decks using improved bending performance, variable slabs, and inverted formwork

Abstract

The present invention relates to a method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance, and more specifically, to a method for constructing a bridge deck on top of a girder, comprising: a girder precast concrete deck plate placement step of placing precast concrete deck plates on top of the girder; a precast concrete deck plate binding reinforcement fastening step of fastening binding reinforcement to the precast concrete deck plates; and a joint space mortar filling step of filling mortar into the joint space formed between the precast concrete deck plates. The present invention provides a method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance, characterized by comprising a finishing step of removing foreign substances from the surface of the precast concrete deck and the hardened mortar. According to the method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance according to the present invention, by interconnecting the precast concrete decks by binding reinforcing bars, the bending stiffness is improved, longitudinal stress redistribution and residual load-bearing capacity are improved, a shear section is provided in the joint filling groove to improve shear strength and bending stiffness, the height of the bulkhead is formed lower than the height of the precast concrete deck to improve the strength and filling properties of the grouting, and by forming the precast concrete deck in the reverse direction so that it is inverted by a formwork device, the problem of having to form separate formworks according to the shape and form of the protrusion is eliminated.

Description

Technology Field

[0001] The present invention relates to a method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance. More specifically, the invention relates to a method for constructing a precast concrete bridge deck in which bending stiffness is improved and longitudinal stress redistribution and residual load-bearing capacity are improved by connecting the precast concrete decks to each other by binding reinforcing bars, shear strength and bending stiffness are improved by providing a shear section in the joint filling groove, the height of the bulkhead is formed lower than the height of the precast concrete deck to improve the strength and filling properties of the grouting, and the problem of having to form separate formworks according to the shape and form of the protrusion is avoided by forming the precast concrete deck in the reverse direction so that it is inverted by a formwork device. Background Technology

[0003] Generally, precast concrete panels are used to construct slabs that serve as floor panels for bridges, roads, etc.

[0004] Among the precast concrete panels mentioned above, in particular, precast concrete panels for bridge construction are manufactured in a factory, transported to the site, and then installed.

[0005] As an example of a precast concrete structure manufactured by assembling and connecting precast concrete floor slab modules in this manner, a floor slab is disclosed in Korean registered patent No. 10-0775580.

[0006] The above-mentioned Patent No. 10-0775580 describes a method for integrating floor plates at the site by forming a recess in the joint of the floor plates, protruding a loop reinforcement bar into the recess so that the loop reinforcement bars of adjacent floor plates overlap each other in the recess, and then filling the recess with a filler material such as non-shrink concrete so that the overlapped loop reinforcement bars are embedded in the filler material.

[0007] However, conventional floor slabs are structured such that the loop reinforcement of each floor slab is overlapped and then filled with a filler material to connect them to one another. Since the floor slabs are connected only by the filler material and loop reinforcement, there is a problem of reduced flexural strength and fixing power. Additionally, there are difficulties in installation due to changes in longitudinal and transverse sections and girder construction errors (transverse curvature, camby), and there is a problem where the production cost of the panels increases because the haunch changes during the production of precast concrete floor slabs and requires a full-face floor slab corresponding to the shape of the transformed haunch. Prior art literature

[0009] Republic of Korea Registered Patent No. 10-0775580 The problem to be solved

[0010] The present invention was devised to solve the aforementioned conventional problems, and the objective of the present invention is to provide a method for constructing a precast concrete bridge deck that improves flexural rigidity and enhances longitudinal stress redistribution and residual load-bearing capacity by interconnecting precast concrete deck plates with binding reinforcement, improves shear strength and flexural rigidity by providing a shear section in the joint filling groove, improves the strength and filling ability of grouting by forming the height of the bulkhead lower than the height of the precast concrete deck plate, and eliminates the problem of having to form separate formwork for each protruding shape and form by forming the precast concrete deck plate in the reverse direction so as to be inverted by a formwork device. means of solving the problem

[0012] To achieve the above objectives, the present invention

[0013] A method for constructing a bridge deck on top of a girder,

[0014] A girder precast concrete floor slab placement step of placing precast concrete floor slabs on the upper part of the above girder;

[0015] A precast concrete floor plate binding rebar fastening step for fastening binding rebar to the above precast concrete floor plate;

[0016] A joint space mortar filling step for filling mortar into the joint space formed between the above precast concrete floor slabs; and

[0017] A method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance is provided, characterized by comprising a finishing step of removing foreign substances from the surface of the precast concrete deck and the hardened mortar.

[0018] In one embodiment of the present invention,

[0019] The above-mentioned precast concrete floor slab has joint filling grooves formed at both ends, and one end of a fixing loop member is inserted and fixed into the inner surface of the joint filling groove.

[0020] One end of a connecting loop member is disposed inside the joint filling groove, and the other end is disposed inside a joint filling groove formed in another precast concrete floor slab, and

[0021] Through holes are further formed on both sides of the above-mentioned precast concrete floor slab to communicate with the joint filling grooves, and

[0022] It is characterized by connecting the above-mentioned through holes and fastening reinforcing bars.

[0023] In addition, in one embodiment of the present invention,

[0024] The above-mentioned precast concrete floor slab has a joint filling groove formed at one end, and one end of a fixing loop member is inserted and fixed into the inner surface of the joint filling groove.

[0025] One end of a guide loop member is inserted and fixed to the other end of the above-mentioned precast concrete floor slab, and

[0026] The other end of the above guide loop member is fitted into a joint filling groove formed in another precast concrete floor slab, and

[0027] Through holes are further formed on both sides of the above-mentioned precast concrete floor slab to communicate with the joint filling grooves, and

[0028] It is characterized by connecting the above-mentioned through holes and fastening reinforcing bars.

[0029] In addition, in one embodiment of the present invention,

[0030] The above joint filling groove is characterized by having a shear section further formed on its inner surface.

[0031] In addition, in one embodiment of the present invention,

[0032] A haunch protrusion is further formed on the above-mentioned precast concrete floor slab, and

[0033] The above-mentioned precast concrete floor slab is formed by a formwork device, and

[0034] The above formwork device comprises a main formwork with an open top and a filling space formed inside, and an upper variable formwork positioned on top of the main formwork.

[0035] The upper variable formwork is characterized by comprising an upper formwork cap disposed on the upper part of the main formwork and having through holes formed therein, and a guide support tube fitted through the through holes formed in the upper formwork cap. Effects of the invention

[0037] According to the method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance according to the present invention, the bending stiffness is improved by interconnecting the precast concrete decks with binding reinforcement, and the longitudinal stress redistribution and residual load-bearing capacity are improved. Additionally, shear sections are provided in the joint filling grooves to improve shear strength and bending stiffness, and the height of the bulkhead is formed lower than the height of the precast concrete deck to improve the strength and filling properties of the grouting. Furthermore, by forming the precast concrete deck in the reverse direction so that it is inverted by the formwork device, the problem of having to form separate formworks according to the shape and form of the protrusion is eliminated. Brief explanation of the drawing

[0039] FIG. 1 is a drawing showing the connection process of precast concrete deck slabs in a method for constructing a precast concrete bridge deck slab using a variable formwork and an inverted formwork to improve bending performance according to the present invention. FIG. 2 is a drawing showing the state in which mortar is filled between precast concrete deck slabs in a method for constructing a precast concrete bridge deck slab using a variable formwork and an inverted formwork to improve bending performance according to the present invention. FIG. 3 is a cross-sectional view showing the state in which precast concrete deck slabs are connected in a method for constructing a precast concrete bridge deck slab using a variable formwork and an inverted formwork to improve bending performance according to the present invention. FIG. 4 is a drawing showing the connection process of precast concrete deck slabs according to another embodiment of a method for constructing a precast concrete bridge deck slab using a variable formwork and an inverted formwork to improve bending performance according to the present invention. FIG. 5 is a precast concrete bridge using a variable formwork and an inverted formwork to improve bending performance according to the present invention This is a cross-sectional view showing a connected state according to another embodiment of the precast concrete floor slabs of the floor slab construction method. Fig. 6 is a drawing showing a formwork device of the precast concrete bridge floor slab construction method using a variable formwork and an inverted formwork to improve bending performance according to the present invention. Fig. 7 is a perspective view showing a precast concrete floor slab formed through the formwork device of the precast concrete bridge floor slab construction method using a variable formwork and an inverted formwork to improve bending performance according to the present invention. Fig. 8 is a drawing showing the installed state of the precast concrete floor slab formed through the formwork device of the precast concrete bridge floor slab construction method using a variable formwork and an inverted formwork to improve bending performance according to the present invention. Specific details for implementing the invention

[0040] The description of the present invention is merely an example for structural or functional explanation, and therefore the scope of the present invention should not be interpreted as being limited by the examples described in the text. That is, since the examples may be modified in various ways and may take various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical concept.

[0041] Meanwhile, the meaning of the terms described in this invention should be understood as follows.

[0042] Terms such as "first," "second," etc., are intended to distinguish one component from another, and the scope of rights shall not be limited by these terms. For example, the first component may be named the second component, and similarly, the second component may be named the first component.

[0043] When it is stated that one component is "connected" to another component, it should be understood that while it may be directly connected to that other component, there may also be other components in between. Conversely, when it is stated that one component is "directly connected" to another component, it should be understood that there are no other components in between. Meanwhile, other expressions describing the relationships between components, such as "between" and "exactly between," or "adjacent to" and "directly adjacent to," should be interpreted in the same way.

[0044] A singular expression should be understood to include a plural expression unless the context clearly indicates otherwise, and terms such as "include" or "have" are intended to specify the existence of the implemented features, numbers, steps, actions, components, parts, or combinations thereof, and should be understood not to preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0045] In each step, identifiers (e.g., a, b, c, etc.) are used for convenience of explanation and do not describe the order of the steps; the steps may occur differently from the specified order unless a specific order is clearly indicated in the context. That is, the steps may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

[0046] Unless otherwise defined, all terms used herein have the same meaning as generally understood by those skilled in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having meanings consistent with the context of the relevant technology and should not be interpreted as having an ideal or overly formal meaning unless explicitly defined in this invention.

[0048] FIG. 1 is a drawing showing the connection process of precast concrete deck plates in a method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance according to the present invention. FIG. 2 is a drawing showing the state in which mortar is filled between precast concrete deck plates in a method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance according to the present invention. FIG. 3 is a cross-sectional view showing the state in which precast concrete deck plates are connected in a method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance according to the present invention. FIG. 4 is a drawing showing the connection process of precast concrete deck plates according to another embodiment of a method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance according to the present invention. FIG. 5 is a cross-sectional view showing a connected state according to another embodiment of a method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance according to the present invention. FIG. 6 is a drawing showing a formwork device for a method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance according to the present invention. FIG. 7 is a perspective view showing a precast concrete deck formed through a formwork device for a method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance according to the present invention. FIG. 8 is a drawing showing an installed state of a precast concrete deck formed through a formwork device for a method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance according to the present invention.

[0050] As illustrated in the drawing, the method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance according to the present invention (hereinafter referred to as the "bridge deck construction method" for convenience of explanation) is a method for constructing a bridge deck on top of a girder, and the bridge deck construction method according to the present invention comprises a girder precast concrete deck placement step (S1), a precast concrete deck binding reinforcement fastening step (S2), a joint space mortar filling step (S3), and a finishing step (S4).

[0052] The above girder precast concrete floor slab placement step (S1) is a step of placing precast concrete floor slabs (10) on top of the girder.

[0053] The above girder precast concrete floor slab placement step (S1) is a step of placing the precast concrete floor slabs (10) on top of the girders placed on top of the bridge piers.

[0054] The above precast concrete floor plate (10) is made of concrete material.

[0055] The above-mentioned precast concrete floor plate (10) has joint filling grooves (11) formed at both ends (both end surfaces), and one end of a fixed loop member (12) is inserted and fixed into the joint filling groove (11) on the inner surface during the process of forming the precast concrete floor plate (10), and one end of a connecting loop member (13) is placed inside the joint filling groove (11), and the other end is placed inside the joint filling groove (11) formed in another precast concrete floor plate (10), and through holes (14) are further formed on both sides of the end portions of the precast concrete floor plate (10) to communicate with the joint filling grooves (11), as shown in the drawing, and a binding reinforcing bar (15) is fastened to connect the through holes (14).

[0056] The fixed loop member (12) and the connecting loop member are formed into a circular or elliptical ring structure and are made of reinforcing bar or metal. It is also possible to form the fixed loop member (12) by bending a reinforcing bar to place the curved end in the joint filling groove (11) and inserting one end into the inner surface of the joint filling groove (11) to secure it.

[0057] In the step of arranging the girder precast concrete floor slabs (10) above, the precast concrete floor slabs (10) are arranged at regular intervals so that a joint space (60) is formed.

[0058] In the above-mentioned precast concrete floor plate (10), shear holes (18) are formed so that the upper surface and the lower surface are connected so that shear keys of a shaft structure, the lower end of which is fixed to the upper surface of the girder by being screwed or welded, are fitted.

[0059] The above joint filling groove (11) is formed such that a part of both ends (both end surfaces) and the upper surface of both ends are connected as shown in the drawing, and is formed in the upper corner portion of both ends.

[0060] At this time, it is also possible to increase the strength of the precast concrete floor plate (10) and prevent deformation by inserting reinforcing bars inside and fixing them in the precast concrete floor plate (10).

[0062] Alternatively, the precast concrete floor plate (10) has a joint filling groove (11) formed at one end, and one end of a fixed loop member (12) is inserted and fixed into the joint filling groove (11) on the inner surface.

[0063] One end of a guide loop member (16) is inserted and fixed to the other end (other end surface) of the precast concrete floor plate (10), and the other end of the guide loop member (16) is fitted into a joint filling groove (11) formed in another precast concrete floor plate (10). Through holes (14) are further formed on both sides of one end of the precast concrete floor plate (10) to communicate with the joint filling groove (11), and a binding reinforcing bar (15) is fastened to connect the through holes (14).

[0064] That is, the other end of the guide loop member (16) is fitted into a joint filling groove (11) formed in another precast concrete floor plate (10), and the binding reinforcing bar (15) is fitted and fixed by connecting the through holes (14), and the binding reinforcing bar (15) is fitted through the guide hoop member disposed inside the fixed loop member (12) and the joint filling groove (11), thereby improving the supporting force and fixing force of the mortar (70) filled in the joint filling groove (11) by the binding reinforcing bar (15) and improving the strength, and improving the supporting force and fixing force of the fixed loop member (12) and the guide hoop member.

[0065] The guide loop member (16) may be formed into an elliptical ring structure and may be made of reinforcing bar or metal. It is also possible to bend the reinforcing bar to place the curved end of the guide loop member (16) into the joint filling groove (11) formed in another sliver bottom plate and insert one end into the other end to fix it.

[0067] At this time, it is also possible to further form a partition wall (19) integrally on the inner surface of the joint filling groove (11) while maintaining a certain distance, and further form through holes (14) in the partition wall (19) so that the binding reinforcing bar (15) can be inserted through them, thereby increasing the strength and improving the binding force of the binding reinforcing bar (15).

[0068] In addition, by forming the upper surface height of the above partition wall (19) lower than the upper surface of the above precast concrete floor plate (10), the mortar (70) is uniformly filled into the joint filling grooves (11) partitioned and divided by the above partition wall (19). The mortar (70) is allowed to move over the above partition wall (19) to other joint filling grooves (11) and be uniformly filled.

[0070] The above precast concrete floor plate binding reinforcement fastening step (S2) is a step of fastening binding reinforcement (15) to the precast concrete floor plate (10).

[0071] In the precast concrete floor plate binding reinforcement fastening step (S2), the binding reinforcement (15) is inserted and fixed by connecting the through holes (14) formed in the precast concrete floor plate (10), and the binding reinforcement (15) is inserted through the connecting loop member (12) and the connecting loop member disposed inside the joint filling groove (11), thereby improving the supporting and fixing strength of the mortar (70) filled in the joint filling groove (11) by the binding reinforcement (15) and improving the strength, and improving the supporting and fixing strength of the fixing loop member (12) and the connecting loop member.

[0073] By further attaching or welding one end of a fixing support pin formed of metal material to the outer surface of the above-mentioned fixed loop member (12), the fixing support pins are inserted into the mortar (70) filled in the joint filling groove (11), thereby improving the supporting force and fixing force of the mortar (70) and the above-mentioned fixed loop member (12), and preventing the hardened mortar (70) from separating from the seating support groove and the above-mentioned fixed loop member (12).

[0074] In the above connecting loop member (13), one end of a metal-based locking support pin is further attached or welded to the outer surface to fix it, thereby allowing the locking support pin to be inserted into the mortar (70) filled in the joint filling groove (11), thereby improving the supporting force and fixing force of the mortar (70) and the connecting loop member (13), and preventing the hardened mortar (70) from separating from the seating support groove and the connecting loop member (13).

[0075] By binding the fixed loop member (12) and the connecting loop member together with a connecting wire, the supporting force and fixing force can be improved and movement can be prevented.

[0076] In the joint filling groove (11), the lower ends of a pair of guide support reinforcing bars are inserted and fixed on the inner bottom surface, and a fitting space is formed between the guide support reinforcing bars. This allows the connecting loop member (13) placed inside the joint filling groove (11) to be fitted or forcibly fitted and fixed between the guide support reinforcing bars, thereby allowing the guide support reinforcing bars to support the connecting loop member (13), thereby increasing the fixing and supporting forces and preventing the connecting loop member (13) from moving. Additionally, the guide support reinforcing bars are inserted into the mortar (70) filled in the joint filling groove (11), thereby increasing the supporting and fixing forces of the mortar (70) and preventing the hardened mortar (70) from moving.

[0078] The above joint space mortar filling step (S3) is a step of filling mortar (70) into the joint space (60) formed between the precast concrete floor plates (10).

[0079] In the joint space mortar filling step (S3), mortar (70) is filled into the upper part of the joint space (60) and the joint filling grooves (11) while an elastic sealing bar made of an elastic synthetic resin material is forcibly fitted or fixed by fitting and then bonding it to both sides and the lower part of the joint space (60) formed between the precast concrete floor plates (10).

[0081] The above finishing step (S4) is a step of removing foreign substances from the surface of the precast concrete floor plate (10) and the hardened mortar (70).

[0082] In the above finishing step (S4), the elastic sealing bar is separated from the joint space (60), and foreign substances are removed from the surface of the precast concrete floor plates (10) and the hardened mortar (70), and the protruding parts are cut off to flatten the surface.

[0084] A shear portion (20) is further formed on the inner surface of the above joint filling groove (11).

[0085] The shear section (20) is composed of shear grooves, and by forming shear grooves on the inner surface of the joint filling groove (11), the mortar (70) filled in the joint filling groove (11) is drawn into the shear grooves, thereby improving the supporting and fixing power of the hardened mortar (70), preventing it from moving due to external forces, and improving strength.

[0086] It is also possible to form the shear portion as shear protrusions that protrude integrally from the inner surface of the joint filling groove (11), so that the shear protrusions are inserted into the mortar (70) filled in the joint filling groove (11), thereby improving the supporting and fixing strength of the hardened mortar (70), preventing it from moving due to external forces, and improving strength.

[0088] A haunch protrusion (17) is integrally formed on the bottom surface of the above-mentioned precast concrete floor plate (10), and an inclined support surface (171) is formed on the bottom surface of the haunch protrusion (17).

[0089] The inclined support surface (171) of the above haunch protrusion (17) is positioned on the upper surface of the girder, thereby allowing the slab bottom surface to be positioned at an angle, so that rainwater can be guided and drained and water accumulation is prevented.

[0090] The above precast concrete floor slab (10) is formed by a formwork device (30) having an inversion structure (forming the precast concrete floor slab in an inverted state) and a variable structure (replacement or movement of the upper variable formwork) and a shear key installation structure (transmission hole structure in which the shear key is installed).

[0091] The above formwork device (30) comprises a square main formwork (40) with an open top and a filling space formed inside, and

[0092] It is composed of an upper variable formwork (50) positioned on top of the main formwork (40), and

[0093] The upper variable formwork (50) comprises an upper formwork cap (51) that is positioned at a certain distance above the main formwork (40), has through holes (511) formed therein, has an open bottom, and has an internal inlet space, and a guide support tube (52) that is inserted through the through holes (511) formed in the upper formwork cap (51), is fixed by screw fastening or welding, and has its lower end positioned to be in contact with the inner bottom surface of the main formwork (40).

[0094] The upper formwork cap (51) can be connected to and positioned on the upper surface of the side wall panels of the main formwork (40), and can be fixed by screw fastening.

[0095] The mortar (70) filled into the upper formwork cap (51) can be introduced into the inlet space of the upper formwork cap (51) by means of viscosity and surface tension. Alternatively, the side wall panels of the main formwork (40) can be connected and placed on the upper surface or screw-fastened to close the upper part of the main formwork (40) so that the finishing panel is placed between the upper formwork caps (51), and then an inlet hole is formed in the finishing panel, and the mortar (70) is introduced through the inlet hole, thereby allowing the mortar (70) to be introduced into the inlet space of the upper formwork cap (51) by the pressure of the inflow. A supply pipe through which the mortar (70) is supplied by a pump can be fitted into the inlet hole.

[0096] The upper variable formwork (50) can be detachably attached to the main formwork (40), so that when the shape of the haunch protrusion (17) or the angle of inclination of the inclined support surface (171) changes, the upper variable formwork (50) can be replaced to match, thereby improving usability and convenience, and when the upper variable formwork (50) is formed integrally with the lower part (floor panel) of the main formwork (40), the problem of having to replace the entire main formwork (40) does not occur.

[0097] At this time, a shear hole (18) can be formed in the slab floor plate by the guide support tube (52).

[0099] In the guide support tube (52), an elastic sealing frame made of an elastic synthetic resin material is further attached and fixed to the lower end that contacts the inner bottom surface of the main formwork (40), thereby ensuring that the elastic sealing frame adheres to the inner bottom surface of the main formwork (40) and maintains airtightness, so that the mortar (70) filled into the main formwork (40) may be blocked from flowing into the guide support tube (52).

[0101] Although the present invention has been described in detail with reference to the drawings, it should be made clear that the embodiments mentioned in the process are merely illustrative and not limiting, and that modifications to components that can be equivalently substituted within the scope of the technical spirit or field of the present invention provided by the following claims are considered to be within the scope of the present invention. Explanation of the symbols

[0103] 10 : Precast concrete floor slab 11 : Joint filling groove 12: Fixed loop member 13: Connecting loop member 14: Through hole 15: Binding rebar 16: Guide loop member 17: Hunch projection 171 : Inclined support surface 18 : Shear hole 19: Bulkhead 20: Shear section 30 : Formwork device 40 : Main formwork 50 : Upper variable formwork 51 : Upper formwork cap 511 : Penetration hole 52 : Guide support tube 60 : Joint space 70 : Mortar S1: Girder precast concrete floor slab placement stage S2: Precast concrete floor slab binding rebar fastening step S3: Joint space mortar filling stage S4: Closing stage

Claims

Claim 1 A method for constructing a bridge deck on top of a girder, comprising: a girder precast concrete deck plate placement step of placing precast concrete deck plates on top of the girder; a precast concrete deck plate binding reinforcement fastening step of fastening binding reinforcement to the precast concrete deck plates; and a joint space mortar filling step of filling mortar into the joint space formed between the precast concrete deck plates. The method is characterized by comprising a finishing step of removing foreign substances from the surface of the precast concrete floor slab and the hardened mortar, wherein the precast concrete floor slab has joint filling grooves formed at both ends, and one end of a fixed loop member is inserted and fixed into the inner surface of the joint filling groove, and one end of a connecting loop member is disposed inside the joint filling groove, and the other end is disposed inside the joint filling groove formed in another precast concrete floor slab, and through holes are further formed on both sides of the precast concrete floor slab to communicate with the joint filling grooves, and binding reinforcing bars are fastened connecting the through holes, and a shear section is further formed on the inner surface of the joint filling groove, and shear holes are formed in the precast concrete floor slab so that the upper surface and the lower surface are connected by inserting shear keys of a shaft structure, the lower end of which is fixed to the upper surface of the girder, and partition walls are formed on the inner surface of the joint filling grooves maintaining a certain spacing, and through holes are formed in the partition walls so that the binding reinforcing bars It is characterized by being inserted through and having the upper surface height of the bulkhead formed lower than the upper surface of the precast concrete floor slab, thereby ensuring that mortar is uniformly filled into the joint filling grooves partitioned and divided by the bulkhead, and by fixing one end of a fixing support pin formed of metal on the outer surface of the fixing loop member so that the fixing support pin is inserted into the mortar filled into the joint filling groove.The above connecting loop member is characterized by fixing one end of a locking support pin formed of metal on its outer surface so that the locking support pins are inserted into the mortar filled in the joint filling groove, and the joint filling groove is characterized by fixing the lower end of a pair of guide support reinforcing bars on the inner surface and forming a fitting space between the guide support reinforcing bars so that the connecting loop member disposed inside the joint filling groove is fitted and fixed between the guide support reinforcing bars and prevents movement, and the guide support reinforcing bars are inserted into the mortar filled in the joint filling groove, and in the joint space mortar filling step, mortar is filled into the upper part of the joint space and the joint filling grooves while an elastic sealing bar made of elastic synthetic resin is fitted and fixed by adhesive on both sides and the bottom of the joint space formed between the precast concrete floor slabs, and a haunch protrusion is further formed on the precast concrete floor slab, and the precast concrete floor slab has an inversion structure and A method for constructing a precast concrete bridge deck using a variable formwork and an inverted formwork to improve bending performance, wherein the formwork device is formed to have a variable structure and a shear key installation structure, and the formwork device comprises a main formwork having an open top and a filling space formed inside, and an upper variable formwork disposed on top of the main formwork, and the upper variable formwork comprises an upper formwork cap disposed on top of the main formwork and having through holes formed therein, and a guide support tube fitted to pass through the through holes formed in the upper formwork cap. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete

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