Assembly stud and slab construction method using thereof

Abstract

To provide an assembly stud and a slab construction method using thereof eliminating a through hole and a cavity part under a slab surface to allow a future generation rate of malfunction caused by wrong filling in the cavity part to be reduced.SOLUTION: A assembly stud (stud unit) integrating a steel girder G1 and a precast slab B1 using a stud with a head which is separated to an upper part and a lower part, through assembly thereof is provided with a base part 2 to be welded on the steel girder G1 a stud body part 3 having the stud with the head to be engaged in the base part 2 and a stud receiving cylindrical part 4 receiving the stud body part 3, to integrate the steel girder G1 and the precast slab B1 by filling filler in the stud receiving cylindrical part 4 and curing.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a headed stud that connects a steel girder used in a composite girder of a bridge to a concrete deck. More specifically, the present invention relates to an assembled stud in which the headed stud is divided into an upper part and a lower part, which are assembled and connected at the time of installation, and a method of constructing a deck using the same. [Background technology]

[0002] Conventionally, in composite girder bridges consisting of steel girders and concrete precast decks, headed studs (also called headed stud dowels; the same applies below) are inserted from the through holes opened on the top surface of the deck to the top surface of the upper flange of the steel girders to prevent slippage after the precast deck is installed. As a result, water can flow around the box punch holes, which can cause structural defects in the precast deck and lead to future weaknesses.

[0003] Furthermore, if a large cavity were created on the underside of the deck and pre-melted studs were to be installed in that position, the pre-installed studs would become an obstacle, making it difficult to install the precast deck and affecting the process, so a construction method was needed that would allow for flexible processing and allow the stud melting to be carried out all at once after the deck was installed.

[0004] In order to solve such problems, Patent Document 1 describes a composite structure of a steel girder 200 and a precast deck 100, in which a box cutout portion 111 that does not penetrate vertically is provided in the precast deck 100, and the steel girder 200 and the precast deck 100 are joined by short studs 300 fused to the steel girder 200 (see Claim 1 in the claims of Patent Document 1, Figures 1 and 5 in the drawings, etc.).

[0005] However, while the composite structure described in Patent Document 1 eliminates the risk of structural defects in that it does not have box-punch holes that penetrate vertically through the precast deck slab, it does have a problem in that a large cavity is created on the underside of the deck slab and pre-melted studs are installed in that position, which means that there is a major concern that the cavity may not be filled properly.

[0006] Furthermore, Patent Document 2 discloses a method for horizontal welding of large diameter studs in which, when welding a steel stud horizontally to a steel wall, a sloped groove is provided on the end face of the stud to be welded, and the portion excluding the sloped groove is preliminarily stud-welded horizontally, after which a cylindrical steel backing metal that has been processed into a U-shape is fitted into the sloped groove portion, and the sloped groove portion enclosed by the U-shaped portion of the backing metal is welded downward by covered metal arc welding, gas-shielded metal arc welding, or no-gas arc welding, with the backing metal becoming part of the steel stud (see claim 1 in the scope of claims of Patent Document 2, paragraphs

[0006] to

[0009] of the specification, and Figures 2 and 3 of the drawings, etc.).

[0007] Furthermore, Patent Document 3 discloses a stud for a composite girder, etc., in which a stud body 1 is welded to a steel girder G, a reinforcing cylinder 2 which has been held in an elevated position is lowered and the female thread 2a is screwed into the male thread 1c, and the lower end face 2c of the cylinder 2 is firmly abutted against the upper face of the steel girder G, and the outer periphery of the welded part w is covered with a covering part 2b (see claim 1 in the claims of Patent Document 3, paragraphs

[0009] to

[0017] of the specification, Figures 1 and 3 of the drawings, etc.).

[0008] However, the large diameter studs in Patent Document 2 and the composite girders and other studs described in Patent Document 3 were unable to solve the problem of future weaknesses in the precast deck or the problem of insufficient filling of the cavities around the studs. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2018-40168 A [Patent Document 2] Japanese Patent Application Publication No. 6-99279 [Patent Document 3] JP 2002-309706 A 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 object is to provide an assembly stud that eliminates through holes and cavities on the underside of the deck, and reduces the rate of future defects due to insufficient filling of the cavities, and a deck construction method using the same. [Means for solving the problem]

[0011] The assembly stud of claim 1 is an assembly stud in which a headed stud is divided into an upper and lower part, which are assembled and connected for use to integrate a steel girder and a precast deck slab, and which is characterized in that it comprises a base portion that is welded to the steel girder, a stud main body portion having a headed stud that engages with the base portion, and a cylindrical stud accommodating tube portion that accommodates the stud main body portion, and a filler material is filled into the stud accommodating tube portion and hardens to integrate the steel girder and the precast deck slab.

[0012] An assembly stud according to a second aspect of the present invention is the assembly stud according to the first aspect, characterized in that the base portion and the stud body portion are configured to be mechanically engageable and detachable.

[0013] The assembly stud of claim 3 is the assembly stud described in claim 2, characterized in that a convex portion is formed on one of the base portion and the stud body portion, and an engagement groove that engages with the convex portion is formed on the other, and the base portion and the stud body portion are configured to be freely engageable and detachable.

[0014] The deck construction method of claim 4 is a deck construction method in which a precast deck is installed across a plurality of steel girders using the assembly studs described in any one of claims 1 to 3, and is characterized in that it includes a deck erection process in which the precast deck is installed across a predetermined position of a plurality of steel girders, and a base portion growth process in which, after the deck erection process, the base portion is grasped from the lateral direction below the precast deck and grown on the steel girders.

[0015] The deck construction method of claim 5 is characterized in that, in the deck construction method of claim 4, it includes a filler filling step of filling the stud accommodating tube portion with filler after the deck erection step.

[0016] The deck construction method of claim 6 is characterized in that, in the deck construction method of claim 4, it further includes a stud unit mounting process, prior to the deck erection process, of mechanically engaging and mounting an assembly stud with a filler material filled in the stud receiving tube portion to the precast deck. Effect of the Invention

[0017] According to the inventions of claims 1 to 6, even if a slip-prevention cotter, which is a recessed portion opening onto the underside, is used instead of providing a through hole that penetrates vertically through the precast deck, which is prone to becoming a structural defect in the precast deck, it is possible to eliminate poor filling of the cotter and reduce the rate of future defects.

[0018] In particular, according to the invention as set forth in claims 2 and 3, the base portion and the stud body can be freely engaged and disengaged, improving working efficiency.

[0019] Furthermore, according to the inventions of claims 4 and 5, not only can the rate of future defects due to insufficient filling of the hollow space be reduced, but the construction period for replacing or constructing a new deck can be shortened, thereby reducing labor costs.

[0020] In particular, according to the invention as defined in claim 6, the process of filling the narrow space under the deck can be omitted, significantly reducing the labor costs of the filling work. Also, according to the invention as defined in claim 6, by attaching assembly studs to the precast deck at the site, the manufacturing process of the precast deck can be separated from the delivery date of the assembly studs, reducing the manufacturing cost of the assembly studs and increasing the freedom of the manufacturing plan for the precast deck. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is an exploded perspective view showing the configuration of an assembly stud according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a vertical sectional view showing the configuration of the assembly stud of the above. [Diagram 3] FIG. 3 is a diagram showing the base portion of the assembly stud, where (a) is a perspective view, (b) is a vertical sectional view, and (c) is a plan view. [Figure 4] FIG. 4 is a diagram showing the stud body of the above assembly stud, where (a) is a perspective view, (b) is a front view, and (c) is a plan view. [Diagram 5] FIG. 5 is a diagram showing the stud receiving portion of the assembly stud of the same, where (a) is a perspective view, (b) is a front view, and (c) is a plan view. [Figure 6] FIG. 6 is a vertical cross-sectional view showing the above assembly stud attached to a precast deck. [Figure 7] FIG. 7 is a process explanatory diagram showing a deck erection process of the deck construction method using assembly studs according to the first embodiment of the present invention. [Figure 8] FIG. 8 is a process explanatory diagram showing a base portion engaging process in the method for constructing a deck using the assembly stud of the above. [Figure 9] FIG. 9 is a process explanatory diagram showing the base portion proliferation process of the deck construction method using the above-mentioned assembly stud. [Figure 10] FIG. 10 is a process explanatory diagram showing a filler filling process in the deck construction method using the assembly studs of the above embodiment. [Figure 11] FIG. 11 is a vertical cross-sectional view showing the precast deck before assembly studs are attached. [Figure 12] FIG. 12 is a process explanatory diagram showing a stud unit mounting process in a deck slab construction method using assembly studs according to the second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of an assembly stud and a method of constructing a deck using the same according to the present invention will be described in detail with reference to the drawings.

[0023] <Assembly stud> First, the configuration of a stud unit 1, which is an assembly stud according to an embodiment of the present invention, will be described with reference to Figures 1 to 5. Figure 1 is an exploded perspective view showing the configuration of a stud unit 1, which is an assembly stud according to an embodiment of the present invention, and Figure 2 is a vertical cross-sectional view showing the configuration of the stud unit 1. Figure 3 shows a base portion 2 of the stud unit 1, where (a) is a perspective view, (b) is a front view, and (c) is a plan view. Figure 4 shows a stud main body portion 3 of the stud unit 1, where (a) is a perspective view, (b) is a front view, and (c) is a plan view. Figure 5 shows a stud receiving tube portion 4 of the stud unit 1, where (a) is a perspective view, (b) is a front view, and (c) is a plan view.

[0024] As shown in Figures 1 and 2, the stud unit 1 is composed of a base portion 2 that is welded to the steel girder, a stud main body portion 3 that engages with this base portion 2, and a stud receiving tube portion 4 that receives the stud main body portion 3.

[0025] (Base part) The base part 2 is a vertically short, bottomed, cylindrical member made of steel material that is welded onto the upper flange of the steel girder. The base part 2 is welded onto the steel girder G1 by manual welding using a power arc method that can apply a certain amount of pressure vertically downward to the steel girder G1 by holding it from the side using a special stud gun 5 described later.

[0026] As shown in FIG. 3, the base portion 2 has a cylindrical base portion main body 20 with a bottom, and a pair of projections 21, 21 that protrude inward from the base portion main body 20 and engage with the stud main body 3 to be latched.

[0027] (Stud body) As shown in Fig. 4, the stud body 3 is made of steel such as silicon-killed steel or aluminum-killed steel, like a normal headed stud, and is composed of a cylindrical stud body 30 with a diameter of φ19-25 mm, and a disk-shaped head 31 with a diameter of φ32-41 mm formed at the upper end of the stud body 30, which is larger than the diameter of the stud body 30. In addition, a pair of engagement grooves 32, 32 that are T-shaped (or inverted L-shaped) in side view are formed at the lower end of the stud body 30, which engage with the protrusion 21 of the base 2 described above. Therefore, the base 2 and the stud body 3 can be engaged or detached freely. However, the base 2 and the stud body 3 may be engaged or detached freely by a screw mechanism.

[0028] (Stud receiving tube) As shown in Figures 1, 2 and 5, the stud accommodating tube portion 4 is a component that accommodates the area near the head 31 of the stud main body 3 and integrates the stud main body 3 with the stud accommodating tube portion 4 and the precast deck B1 by filling and hardening the area around this head 31 with a filler material described below.

[0029] As shown in Figure 5, the stud accommodating tube portion 4 is composed of a cylindrical accommodating tube main body 40 which is filled with and accommodates the filler, a hollow cylindrical insertion portion 41 through which the head portion 31 formed below the accommodating tube main body 40 is inserted, and a lid portion 42 which is screwed onto the top of the accommodating tube main body 40 to seal the top.

[0030] 5, the housing tube body 40 has an injection port 40a for injecting the filler and a discharge port 40b for discharging the air in the housing tube body 40 and the overflowing filler when injecting the filler. The height of the cavity in the housing tube body 40 is adjusted so that the head 31 can move up and down in the housing tube body 40, facilitating the operation of hooking the engagement groove 32 of the stud body 30 onto the protrusion 21 of the base body 20. However, if the filler is not injected after the precast deck B1 is erected on the steel girder G1, these injection port 40a and discharge port 40b are not necessary.

[0031] <Construction method of deck using assembled studs> [First embodiment] Next, a method for constructing a deck using an assembly stud according to the first embodiment of the present invention will be described with reference to Figures 6 to 10. The explanation will be given by taking as an example a case in which the above-mentioned stud unit 1 is installed as an assembly stud at the joint between a steel girder G1, which is a composite girder, and a precast deck (precast concrete deck) B1 to construct the deck.

[0032] In the method of constructing a deck using an assembly stud according to the first embodiment of the present invention, as shown in Fig. 6, the stud body 3 and stud receiving tube 4 of the stud unit 1 are attached to a precast deck B1 in advance, and the precast deck B1 with these attached is placed in a predetermined position on the steel girder G1, after which the base 2 is welded to engage the base 2 with the stud body 3 (see also the figure). Fig. 6 is a vertical cross-sectional view showing the state in which the stud unit 1 has been attached to the precast deck B1.

[0033] (Slab erection process) First, in the deck construction method using assembly studs according to the first embodiment, as shown in Fig. 7, a deck erection process is performed in which a precast deck B1 is installed across a plurality of steel girders G1 at a predetermined position using a lifting machine such as a crane. At this time, as described above, the stud body 3 and stud receiving tube 4 are attached to the precast deck B1 in advance, and the lower part of the stud body 30 of the stud body 3 is exposed from the underside of the precast deck B1 (see Fig. 6). Fig. 7 is a process explanatory diagram showing the deck erection process of the deck construction method using assembly studs according to the first embodiment.

[0034] (Base portion engagement process) Next, in the method for constructing a deck using assembly studs according to the first embodiment, a base portion engagement step is performed in which the base portion 2 is engaged with the lower portion of the stud body 30 exposed from the underside of the precast deck B1, as shown in Fig. 8. Specifically, in this step, the base portion 2 is pressed against the lower portion of the stud body 30 exposed from the underside of the precast deck B1 and rotated to engage the pair of projections 21, 21 with the pair of engagement grooves 32, 32 (see also Figs. 1 and 2). Fig. 8 is a process explanatory diagram showing the base portion engagement step of the method for constructing a deck using assembly studs according to the first embodiment.

[0035] (Base part breeding process) Next, in the method for constructing a deck using assembly studs according to the first embodiment, a base portion propagation process is carried out in which the base portion 2 engaged with the stud body portion 3 in the previous process is grasped from the side below the precast deck B1 and propagated onto the upper flange of the steel girder G1. Figure 9 is a process explanatory diagram showing the base portion propagation process of the method for constructing a deck using assembly studs according to the first embodiment.

[0036] Specifically, as shown in Fig. 9, the base part 2 is welded to the steel girder G1 by manual welding using a power arc method, using a special lateral stud gun 5 that can grip the base part 2 from the side and apply a certain amount of pressure vertically downward to the steel girder G1. In other words, the base part 2 is gripped by the lateral stud gun 5, pressed against the upper flange of the steel girder G1 to pass an electric current, generating a spark (arc) between the steel girder G1 and the base part 2, melting the contact area between the base part 2 and the steel girder G1, and welding is performed by applying pressure.

[0037] In this way, in the deck construction method using assembly studs in the first embodiment, unlike the conventional method of performing the breeding process such as stud breeding, which is dependent on the weather, it is possible to perform the breeding process together after the deck erection process, solving the problem of pre-installed studs becoming an obstacle, making it difficult to install the precast deck and affecting the process.

[0038] Furthermore, even if poor welding is discovered in the welded portion, because the base portion 2 is low in height, it is possible to remove the poorly welded base portion 2 even in the narrow space between the precast deck B1 and the steel girder G1, and re-weld a new base portion 2 using the lateral stud gun 5.

[0039] (Filling material filling process) Next, in the method for constructing a deck using an assembly stud according to the first embodiment, as shown in FIG. 10, a filler filling step is performed in which the filling tube body 40 of the stud receiving tube portion 4 is filled with a filler, which is a hardened resin. Specifically, the hardened resin is pressed into the receiving tube body 40 of the stud receiving tube portion 4 from an injection port (not shown) of the precast deck B1 that communicates with the injection port 40a described above using a compressor or the like, and the air and the hardened resin overflowing from the receiving tube body 40 are discharged from an outlet (not shown) of the precast deck B1 that communicates with the outlet 40b described above. When the hardened resin is discharged from the outlet, it is determined that the hardened resin has been filled into the entire receiving tube body 40, and the pressing of the hardened resin is terminated. FIG. 10 is a process explanatory diagram showing the filler filling step of the method for constructing a deck using an assembly stud according to the first embodiment.

[0040] The curable resin injected as the filler in this step is preferably a delayed curing resin in order to prevent the resin from curing during the injection process. An example of a delayed curing resin is a delayed curing resin obtained by adding an amine-based curing agent to a room temperature curing epoxy resin to adjust the curing time. However, the filler injected in this step is not limited to a curable resin, and any filler that hardens after a certain period of time, such as mortar, can be used.

[0041] When this process is completed and the delayed-curing resin hardens, the head 31 of the stud body 3 accommodated in the stud receiving tube 4 is solidified with the hardening resin, and the stud body 3 and the stud receiving tube 4 are integrated together. In addition, because the stud receiving tube 4 is embedded and installed in advance when the concrete for the precast deck B1 is poured, the steel girder G1 and the precast deck B1 are integrated via the stud body 3, forming a composite girder.

[0042] According to the method for constructing a deck using assembly studs according to the first embodiment of the present invention described above, not only is it unnecessary to provide a box-punch hole penetrating vertically in the precast deck B1, which may cause a structural defect, but it is also possible to eliminate cavities such as cotters, which are recesses that open into the underside of the deck to accommodate the half studs. As a result, the filling work of mortar, concrete, or other filler is eliminated, which not only reduces the rate of future defects caused by insufficient filling of the cavities, but also reduces the labor costs by shortening the construction period for replacing or constructing a new deck.

[0043] In addition, in the deck construction method using the assembly studs according to the first embodiment, the work of growing the studs is more labor-intensive than the conventional work of working from above and below the deck because the work is performed in the narrow space between the precast deck B1 and the steel girder G1. However, by limiting the part to be grown to the short base part 2 and configuring it so that it can be detached and engaged from the upper stud body part 3, it becomes easier to handle in a narrow space and can also be re-grown.

[0044] [Second embodiment] Next, a method for constructing a deck using an assembled stud according to a second embodiment of the present invention will be described with reference to Figures 11, 12, 8, and 9. The method will be described by taking as an example a case in which the above-mentioned stud unit 1 is installed as an assembled stud at the joint between a steel girder G1, which is a composite girder, and a precast deck B1.

[0045] The method of constructing a deck using assembly studs according to the second embodiment differs from the method of constructing a deck using assembly studs according to the first embodiment described above in that the stud body 3 and stud receiving tube 4 of the stud unit 1 are not attached in advance when the precast deck B1 is manufactured, as shown in Figure 11. However, a joint tube 6 into which the stud receiving tube 4 can be screwed is embedded when the precast deck B1 is manufactured, so that the stud unit 1 can be attached to the precast deck B1 at the site before the precast deck B1 is erected. Figure 11 is a vertical cross-sectional view showing the state before the stud unit 1 is attached to the precast deck B1.

[0046] (Stud unit installation process) First, in the method for constructing a deck using an assembly stud according to the second embodiment, as shown in FIG. 12, at the site of deck replacement or new deck construction, a stud unit mounting process is performed in which a stud unit 1 is mounted on a joint tube 6 embedded in a precast deck B1 immediately before the next deck erection process. In this process, the stud unit 1 is mounted on the joint tube 6 by screwing a thread formed on the outer surface of the stud receiving tube 4 into a thread groove formed on the inner surface of the joint tube 6. At this time, the receiving tube body 40 of the stud unit 1 is filled with the aforementioned delayed curing resin. FIG. 12 is a process explanatory diagram showing the stud unit mounting process of the method for constructing a deck using an assembly stud according to the second embodiment.

[0047] In this way, by attaching the stud unit 1 to the precast deck B1 on-site, the manufacturing process of the precast deck B1 can be separated from the delivery date of the stud unit 1, reducing the manufacturing cost of the stud unit 1 and increasing the freedom of the manufacturing plan for the precast deck B1. Also, the process of filling the narrow space under the deck with filler can be omitted, which also greatly reduces the labor cost of filling the filler.

[0048] Furthermore, the method of attaching the stud unit 1 to the joint tube 6 is not limited to screw attachment, and the stud unit 1 may be attached to the joint tube 6 by other mechanical engagement methods. However, the method of attaching by screwing is preferable because it is easy to adjust the height between the steel girder G1 and also because the specified strength can be easily ensured by taking the length of the screwed part.

[0049] Furthermore, in this process, unlike the deck construction method using the assembly stud according to the first embodiment, it is preferable that the base portion 2 is engaged with the lower portion of the stud body 30 in advance.

[0050] (Slab erection process) Next, in the second embodiment of the deck construction method using assembly studs, a deck erection process is performed in which a precast deck B1 is installed across multiple steel girders G1 at predetermined positions using a lifting machine such as a crane. At this time, since the stud units 1 have been attached to the precast deck B1 in the previous process, the base parts 2 of the stud units 1 protrude from the underside of the precast deck B1, and the base parts 2 are placed on the steel girders G1 (see FIG. 8).

[0051] (Base part breeding process) Next, in the second embodiment of the deck construction method using assembly studs, a base portion growth process is carried out in which the base portion 2 of the stud unit 1 placed on the steel girder G1 in the previous process is grasped from the lateral direction below the precast deck B1 and grown on the upper flange of the steel girder G1 (see Figure 9).

[0052] In the deck construction method using assembly studs in the second embodiment, similar to the deck construction method using assembly studs in the first embodiment, the base portion 2 is welded to the steel girder G1 by manual power arc welding using a special lateral stud gun 5 that can grasp the base portion 2 from the side and apply a certain amount of pressure vertically downward to the steel girder G1.

[0053] Incidentally, even in the deck construction method using assembly studs according to the second embodiment, if poor welding is found in the welded portion, the poorly welded base portion 2 can be removed even in the narrow space between the precast deck B1 and the steel girder G1, and a new base portion 2 can be re-welded with the lateral stud gun 5. As described above, the base portion 2 can be removed by rotating it to release the engagement between the pair of engagement grooves 32, 32 and the pair of protrusions 21, 21.

[0054] Thereafter, as the delayed-curing resin hardens, the head 31 of the stud body 3 housed within the stud receiving tube 4 is solidified with the hardening resin, integrating the stud body 3 and the stud receiving tube 4. In addition, the stud receiving tube 4 is mechanically joined by screws to the connecting tube 6 that was embedded during the manufacture of the precast deck B1, so the steel girder G1 and the precast deck B1 are integrated via the stud body 3, forming a composite girder.

[0055] According to the deck construction method using assembly studs of the second embodiment of the present invention described above, in addition to the advantageous effects of the deck construction method using assembly studs of the second embodiment, the process of filling the narrow space under the deck can be omitted, which also makes it possible to significantly reduce the labor costs of the filler filling work.

[0056] In addition, according to the deck construction method using assembly studs in the second embodiment, by attaching the stud unit 1 to the precast deck B1 on-site, the manufacturing process of the precast deck B1 can be separated from the delivery date of the stud unit 1, reducing the manufacturing cost of the stud unit 1 and increasing the freedom of manufacturing planning for the precast deck B1.

[0057] The assembly stud according to the embodiment of the present invention and the floor slab construction method according to the first and second embodiments using the same have been described in detail above. However, the above-mentioned or illustrated embodiments are merely examples of specific embodiments for carrying out the present invention. Therefore, the technical scope of the present invention should not be interpreted as being limited by these.

[0058] In particular, the stud unit 1 has been described as having a pair of protrusions 21, 21 on the base portion 2, and a pair of engagement grooves 32, 32 formed in the stud body portion 3 that engages with these protrusions; however, the number and locations of these protrusions and recesses can be set as appropriate, and it is also acceptable for the base portion to have engagement recesses and the stud body portion 3 to have protrusions, or for the base portion 2 and stud body portion 3 to be mechanically joined or removed by screws. [Explanation of symbols]

[0059] 1: Stud unit (assembly stud) 2: Base section 20: Base body 21: Convex 3: Stud body 30: Stud body 31:Head 32: Engagement groove 4: Stud receiving tube 40: Housing tube body 40a: Inlet 40b outlet 41: Insertion part 42: Lid part 5: Stud gun 6:Joint tube G1: Steel girder B1: Precast floor slab

Claims

1. The headed stud is divided into an upper part and a lower part, which are assembled and connected to integrate the steel girder and the precast deck slab. The stud body includes a base portion that is welded to the steel girder, a stud body portion having a headed stud that is engaged with the base portion, and a cylindrical stud receiving tube portion that receives the stud body portion, The stud receiving tube is filled with a filler material, which hardens to integrate the steel girder and the precast deck. Assembly studs featuring.

2. The base portion and the stud body portion are configured to be mechanically engageable and detachable. Assembly stud according to claim 1 , characterized in that

3. A convex portion is formed on one of the base portion and the stud body portion, and an engagement groove that engages with the convex portion is formed on the other, so that the base portion and the stud body portion are configured to be freely engaged or detached. Assembly stud according to claim 2 , characterized in that

4. A method for constructing a deck in which a precast deck is spanned over a plurality of steel girders using the assembly stud according to any one of claims 1 to 3, A deck erection process of installing the precast deck across a plurality of steel girders at predetermined positions; A base portion growth process is provided in which the base portion is grasped from the lateral direction under the precast deck after the deck erection process and grown on the steel girder. A method for constructing a deck, characterized by the above.

5. The method further includes a filler filling step of filling the stud receiving tube portion with a filler after the deck erection step. The method for constructing a deck according to claim 4, characterized in that

6. The method includes a stud unit mounting step of mechanically engaging and mounting an assembly stud having a filler filled in the stud receiving tube portion to the precast deck before the deck erection step. The method for constructing a deck according to claim 4, characterized in that

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