KR102188663B1 - Precast end block, psc girder with the same, bridge with the psc girder and construction method of the psc girder using the same - Google Patents

Abstract

Disclosed are a precast end block, a PSC girder including the precast end block, a bridge, and a PSC girder manufacturing method using the precast end block, wherein the precast end block includes: a sheath pipe corresponding to the PSC girder; and a main body in which the sheath pipe is installed inside and which includes a concrete part and a reinforcing bar. The main body is provided with a length in a longitudinal direction so that the sheath pipe can be arranged inside the main body. Therefore, the precast end block can shorten a construction period.

Description

Precast end block, PSC girder including the same, bridge including PSC girder, and method of manufacturing PSC girder using precast end block {PRECAST END BLOCK, PSC GIRDER WITH THE SAME, BRIDGE WITH THE PSC GIRDER AND CONSTRUCTION METHOD OF THE PSC GIRDER USING THE SAME}

The present application relates to a precast end block, a PSC girder including the same, a bridge including the PSC girder, and a method of manufacturing a PSC girder using the precast end block.

In general, PSC girders can be manufactured through processes such as rebar processing, formwork deck installation, reinforcement assembly, sheath pipe installation, formwork assembly, concrete placement and curing.

However, according to this existing method, a large number of workers of 10 to 11 people are required to manufacture the PSC girder, and in particular, a lot of time is consumed in the process of installing the formwork floor plate, the process of assembling the rebar, and the process of installing the sheath pipe, Had to be committed.

In addition, the longitudinal end portion of the PSC girder may have a complex structure due to the installation of a sheath tube to fix the tension member that pre-stresses (pre-tension) the girder. Due to the structural complexity of the longitudinal end portion of the PSC girder, The PSC girder fabrication had a high difficulty and a long construction period was required.

The technology behind the present application is disclosed in Korean Patent Publication No. 10-2057200.

The present application is to solve the problems of the prior art described above, the precast end block capable of lowering the difficulty of manufacturing the PSC girder and making it easy, thereby shortening the construction period, PSC girder including the same, It is an object of the present invention to provide a bridge including a PSC girder and a method of manufacturing a PSC girder using precast end blocks.

However, the technical problems to be achieved by the embodiments of the present application are not limited to the technical problems as described above, and other technical problems may exist.

As a technical means for achieving the above technical problem, the precast end block according to an aspect of the present application, the sheath tube corresponding to the PSC girder; And a body having the sheath tube installed therein and including a concrete portion and a reinforcing bar, wherein the body may be provided with a longitudinal length in which the sheath tube can be disposed.

The PSC girder according to an aspect of the present application may include a precast end block according to the aspect of the present application.

A bridge according to one aspect of the present application may include a PSC girder according to one aspect of the present application.

A method of fabricating a PSC girder using a precast end block according to an aspect of the present disclosure includes: disposing two precast end blocks corresponding to respective ends of both sides of the PSC girder in the longitudinal direction; (b) arranging a formwork for pouring concrete for the intermediate portion of the PSC girder outside the transverse direction of each of the two precast end blocks; And (c) pouring and curing concrete for the intermediate portion of the PSC girder, and demolding the formwork.

The above-described problem solving means are merely exemplary and should not be construed as limiting the present application. In addition to the above-described exemplary embodiments, additional embodiments may exist in the drawings and detailed description of the invention.

According to the above-described problem solving means of the present application, a precast end block including a sheath tube is pre-fabricated in a factory, and this precast end block is brought into the field and positioned as a substitute for the longitudinal outer end formwork for the manufacture of a PSC girder. Therefore, since the production of the PSC girder using this can be performed, the process of manufacturing the longitudinal end of the PSC girder, which was complicated in the production of the PSC girder, can be worked in advance in the factory, and other relatively simple processes can be carried out in the field. An easy and advanced method of manufacturing PSC girders that enables faster work with a smaller number of personnel than before can be implemented.

1 is a schematic conceptual diagram of a cross section in a vertical direction of a part of a longitudinal direction of a PSC girder to which a precast end block according to an embodiment of the present disclosure is applied.
2 is a schematic conceptual diagram of a cross section in a horizontal direction of a part of a longitudinal direction of a PSC girder to which a precast end block according to an embodiment of the present disclosure is applied.
3 is a schematic conceptual diagram of a cross section in a vertical direction of a precast end block according to an embodiment of the present application.
4 is a schematic conceptual diagram of the AA cross section of FIG. 3.
5 is a schematic conceptual diagram of a cross section taken along BB of FIG. 4.
6 is a schematic side view showing the interior of a precast end block according to an embodiment of the present application to which a formwork for forming an intermediate portion of a PSC girder is connected.
7 is an enlarged view of B of FIG. 6.
8 is a schematic conceptual diagram of the FF cross section of FIG. 7.
9 is an enlarged view of A of FIG. 2.
FIG. 10 is an enlarged view of A of FIG. 2 for explaining a protrusion of a formwork of a type different from that of FIG. 9 of a precast end block according to an embodiment of the present disclosure.
FIG. 11 is a schematic cross-sectional view for explaining that a stepped surface is formed between a notch and an inner surface of a main body in a longitudinal direction among an outer surface in a transverse direction of a precast end block according to an exemplary embodiment of the present disclosure.
12A is a schematic conceptual diagram of the EE cross section of FIG. 3.
12B is a schematic conceptual diagram of the EE cross section of FIG. 3 for explaining a protrusion of a type different from that of FIG. 12A of a precast end block according to an embodiment of the present disclosure.
13 is a schematic conceptual diagram of a cross section of CC of FIG. 3.
14 is a schematic cross-sectional view of a lower edge portion of a precast end block according to an embodiment of the present application for explaining that a lower edge portion of a precast end block according to an embodiment of the present application is chamfered.
15 is a schematic conceptual diagram of the DD cross section of FIG. 3.
16 is a schematic conceptual diagram of a cross section GG of FIG. 1.
17 is a schematic perspective view showing that a plurality of guide frames are arranged in a method of manufacturing a PSC girder using a precast end block according to an embodiment of the present application.
18 is a schematic cross-sectional view of the guide frame of FIG. 17.
19 is a schematic perspective view for explaining the arrangement of a guide frame and a mounting member in a method of manufacturing a PSC girder using a precast end block according to an embodiment of the present application.
20 is a schematic perspective view for explaining the arrangement of the floor plate of the method for manufacturing a PSC girder using a precast end block according to an embodiment of the present application.
21 is a schematic cross-sectional view of a lower portion of a precast end block according to an embodiment of the present application disposed on a guide frame of a method of manufacturing a PSC girder using a precast end block according to an embodiment of the present application.

Hereinafter, exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present application. However, the present application may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in the drawings, parts not related to the description are omitted in order to clearly describe the present application, and similar reference numerals are attached to similar parts throughout the specification.

Throughout this specification, when a part is said to be "connected" with another part, it is not only the case that it is "directly connected", but also "indirectly connected" or "electrically connected" with another element interposed therebetween. "Including the case.

Throughout this specification, when a member is positioned "on", "upper", "upper", "under", "lower", and "lower" of another member, this means that a member is located on another member. It includes not only the case where they are in contact but also the case where another member exists between the two members.

Throughout the specification of the present application, when a certain part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

In addition, terms related to direction or position (upper, upper, upper, lower, lower, lower, longitudinal direction, transverse direction, etc.) in the description of the embodiments of the present application are set based on the arrangement state of each component shown in the drawings. I did it. For example, when looking at FIG. 1, the 12 o'clock direction is the upper side, the portion facing the 12 o'clock direction is the top, the end facing the 12 o'clock direction is the top, the 6 o'clock direction is the lower side, and the overall A portion facing the 6 o'clock direction may be a lower portion, an end portion facing the 6 o'clock direction overall, the overall 3 o'clock-9 o'clock direction may be a longitudinal direction, and the like. In addition, when looking at FIG. 2, the 3 o'clock to 9 o'clock direction may be a longitudinal direction, the 12 o'clock to 6 o'clock direction may be a horizontal direction, and the like.

The present application relates to a precast end block, a PSC girder including the same, a bridge including the PSC girder, and a method of manufacturing a PSC girder using the precast end block.

First, a description will be given of a precast end block (hereinafter referred to as “the present precast end block”) 1 according to an embodiment of the present disclosure.

1 is a schematic conceptual diagram of a cross section in a vertical direction of a part of a longitudinal direction of a PSC girder to which a precast end block according to an embodiment of the present invention is applied, and FIG. 2 is a precast end block according to an embodiment of the present application It is a schematic conceptual diagram of a horizontal cross section of a part in the longitudinal direction of a PSC girder, and FIG. 3 is a schematic conceptual diagram of a vertical cross section of a precast end block according to an embodiment of the present application, and FIG. 4 is an AA cross section of FIG. 5 is a schematic conceptual diagram of a cross section of BB of FIG. 4, and FIG. 6 is a view showing the interior of a precast end block according to an embodiment of the present application to which a formwork for forming an intermediate portion of the PSC girder is connected. It is a schematic side view, FIG. 7 is an enlarged view of B of FIG. 6, and FIG. 8 is a schematic conceptual view of an FF cross section of FIG. 7.

1 and 2, the present precast end block 1 is applied as the longitudinal outer end a of the PSC girder. The PSC girder may comprise two longitudinal outer ends (a) and an intermediate portion (b) between two longitudinal outer ends (a). The present precast end block 1 can be applied as the longitudinal outer end a of such a PSC girder.

3 to 5, the present precast end block 1 includes a sheath tube 11 corresponding to a PSC girder. The sheath tube 11 may receive an outer end of the tension member 8 in the longitudinal direction for introducing prestress to the PSC girder.

In addition, referring to FIGS. 3 to 5, the present precast end block 1 has a sheath tube 11 installed therein, and includes a body 12 including a concrete portion and reinforcement. Since the prestress may be concentrated in the precast end block 1, the concrete portion of the main body 12 may be made of high-strength concrete.

In addition, the present precast end block 1 may be manufactured in advance. Accordingly, when the PSC girder is manufactured, the precast end block (1), which is pre-fabricated, is brought into the PSC girder manufacturing site and applied as the longitudinal outer end (a) of the PSC girder. Therefore, the process of manufacturing the longitudinal end of the PSC girder, which was complicated in the manufacture of the PSC girder, can be pre-worked in the factory, and other relatively simple processes can be carried out in the field. The easiest and advanced PSC girder fabrication method possible can be implemented.

In addition, referring to FIGS. 1 and 2, the main body 12 is provided with a longitudinal length in which the sheath tube 11 can be disposed.

Referring to FIG. 6, the body 12 may be provided to serve as an end formwork for closing the longitudinal outer end when concrete is placed on the intermediate portion b of the PSC girder. For example, referring to FIG. 4, the precast end blocks 1 are spaced apart from each other in the length direction (longitudinal direction) of the PSC girder, and between the bone precast end blocks 1 spaced apart from each other in the longitudinal direction. In the case of placing concrete for the middle part (b) of the PSC girder, a form (9) that closes the outer side in the transverse direction can be set, and the concrete forming the middle part (b) is closed in the transverse direction by the formwork (9). And, it may be poured into a space formed by closing the outer side in the longitudinal direction by the body 12.

In addition, referring to Figs. 7 and 8, on the outer side in the transverse direction of the main body 12, the formwork 9 disposed outside the transverse direction of the middle portion (b) for pouring concrete into the middle portion (b) The longitudinal ends may be overlapped and disposed to overlap some sections.

In addition, referring to FIG. 3, the main body 12 is formed on the outer side in the transverse direction for some sections so that the longitudinal end of the formwork 9 can be fixed to the outer side in the transverse direction of the main body 12 by screwing. It may include a female thread exposed to. The female screw portion may include a plurality of female screw holes 1211 formed at intervals along the vertical direction with respect to the outer surface in the transverse direction of the main body 12. 7 and 9, the insert 1219 passes through the longitudinal end of the formwork 9 and is fastened to the female threaded hole 1211 of the body 12, so that the formwork 9 is fixed to the body 12. Can be.

9 is an enlarged view of A of FIG. 2, and FIG. 10 is an enlarged view of A of FIG. 2 for explaining a protrusion of a formwork of a type different from that of FIG. 9 of a precast end block according to an embodiment of the present application.

Referring to FIGS. 3 and 9, a groove-shaped notch 122 may be formed to extend along the vertical direction on a surface between the female threaded portion and the inner surface of the body 12 in the horizontal direction of the outer surface of the body 12. In addition, referring to FIG. 9, a protrusion 91 may be formed at an end portion in the longitudinal direction of the formwork 9 to protrude inward in the transverse direction corresponding to the notch 122. When the concrete is poured into the intermediate part (b) by the protrusion 91 inserted into the notch 122, some of the concrete to be poured may be blocked from flowing into the female threaded part.

When concrete is poured into the middle part (b), some of the concrete to be poured may be introduced between the outer surface of the body 12 in the transverse direction and the inner surface of the formwork 9, and the introduced concrete is the notch 122 and the protrusion ( 91) can be prevented from moving further outward in the longitudinal direction (moving toward the female threaded part, moving away from the intermediate part (b)) by the engaged part.

If concrete flows into the female screw portion (female screw hole 1211), it may be difficult to release the screw connection between the female screw hole 1211 and the insert 1219. In this case, it may be difficult to separate the formwork 9 from the body 12 later. In consideration of this point, the precast end block 1 may block (prevent) the inflow of concrete into the female threaded portion by using the notch 122 and the protrusion 91.

Referring to FIG. 9, the protrusion 91 may be formed by attaching a protruding block (protrusion member) to serve as the protrusion 91 to the inner side (inner surface) in the transverse direction of the formwork 9 through welding or the like. . Alternatively, referring to FIG. 10, the protrusion 91 may be formed by bending the formwork 9. For reference, the formwork 9 may include a plate material (steel plate), and the plate material may be bent to form the protrusion 91.

11 is a schematic cross-sectional view for explaining that a stepped surface is formed between a notch and an inner surface of a main body in a longitudinal direction among an outer surface of a precast end block in a transverse direction according to an exemplary embodiment of the present disclosure.

Referring to FIG. 11, a surface between the notch 122 and the inner surface of the main body 12 in the longitudinal direction among the outer surfaces in the transverse direction is a stepped surface that is recessed inwardly in the transverse direction than the surface between the female threaded portion and the notch 122 It may be (123). By the step surface 123, the stepped space 92 formed between the step surface 123 and the formwork 9 with a boundary between the line formed by the notch 122 in the concrete poured for the intermediate portion (b) Can flow in. Accordingly, at least a part of the concrete poured to form the intermediate portion (b) may be introduced through the stepped space 92 to form a line bordering the notch 122.

The concrete part of the main body 12 of the precast end block 1 may be made of high-strength concrete, and the middle part (b) may be made of general concrete. According to this difference in strength, the surface color of the main body 12 and The surface colors of the intermediate portion (b) may be slightly different from each other. Alternatively, even if the concrete part and the middle part (b) of the main body 12 are made of the same type of concrete, the surface color of the main body 12 and the surface of the intermediate part (b) due to differences in manufacturing time and curing period Colors can appear differently. Accordingly, if there is no notch 122, the concrete flowing between the lateral outer surface of the body 12 and the inner surface of the formwork 9 may form an irregular line on the surface due to such color difference. , After removing the formwork (9), the irregular line formed by the longitudinal outer portion of the concrete flowing between the body 12 and the transverse outer surface and the inner surface of the formwork 9 is the color of the body 12 and the introduced concrete It may not be aesthetically pleasing due to the difference in color that has been cured.

On the other hand, according to the present precast end block 1, since the incoming concrete can only reach the point where the notch 122 is formed, it is possible to form a clear line bordering the notch 122, so the formwork ( 9) A more improved aesthetic can be secured even after removal.

12A is a schematic conceptual diagram of the EE cross-section of FIG. 3, and FIG. 12B is a schematic conceptual diagram of the EE cross-section of FIG. 3 for explaining a protrusion of a type different from that of FIG. 12A of a precast end block according to an embodiment of the present application. .

In addition, referring to FIGS. 3 and 12A, the inner surface in the longitudinal direction, which is the surface from the main body 12 toward the intermediate part (b) of the PSC girder, increases the contact area with the concrete to be poured corresponding to the intermediate part (b). A protrusion 125 protruding inward may be formed. The protrusion 125 may also at least partly serve as a shear key that amplifies the design shear resistance force between the precast end block 1 and the concrete interface forming the intermediate portion b to be placed afterwards. When concrete is poured into the middle part (b) and cured concrete using the main body 12 as a longitudinal outer formwork, the part in contact with the main body 12 of the middle part (b) is fitted with the protrusion 125 A biting depression may be formed.

Referring to FIG. 12A, a plurality of protrusions 125 may be formed at intervals in the vertical direction.

In addition, referring to FIG. 12B, each of the plurality of protrusions 125 is transverse from one outer side of the transverse outer side of both sides of the main body 12 to the other outer side to facilitate the manufacture of a form for forming the protrusion 125. It may be a linear protrusion continuously extending along the direction. The main body 12 may be formed by pouring concrete into a formwork. When the protrusion 125 is formed in a linear shape, the formwork may be simplified, and thus the main body 12 may be easily manufactured. The precast end block 12 may form the protrusion 125 linearly in consideration of this point.

In addition, as described above, a groove-shaped notch 122 may be extended along the vertical direction on the outer surface of the body 12 in the lateral direction, and the longitudinal end of the formwork 9 corresponds to the notch 122 Thus, the protrusion 91 may be formed in the transverse direction, and the surface between the notch 122 and the inner surface in the longitudinal direction of the body 12 among the outer surfaces in the transverse direction is inside the transverse direction than the surface between the female threaded part and the notch 122 It may be a stepped surface 123 that is formed in a stepwise depression, and between the stepped surface 123 and the formwork 9 with the line formed by the notch 122, the concrete poured for the middle part (b) is By flowing into the formed stepped space, the linear protrusion may be covered.

As described above, when the protrusion 125 is formed linearly in the transverse direction, when looking at the PSC girder from the outer side in the transverse direction after the manufacture of the PSC girder, the portion in which the linear protrusion 125 is formed protrudes in the longitudinal direction. The appearance of the girder may be degraded due to (the uneven-shaped boundary due to the protrusion appears on the outer surface in the transverse direction). On the other hand, according to the present application, the concrete of the middle part (b) is introduced between the outer surface in the transverse direction of the body 12 and the inner surface of the formwork 9, forming a line bordering the notch 122, and is linear. Since it is possible to cover the uneven-shaped boundary appearing due to the protrusion 125 on the outer surface in the lateral direction of the protrusion 125, the boundary portion of the linear protrusion 125 is prevented from being exposed to the outside in the lateral direction, thereby preventing aesthetic degradation. I can.

13 is a schematic conceptual diagram of the CC cross section of FIG. 3, and FIG. 14 is a precast according to an embodiment of the present application for explaining that a lower edge portion of a precast end block according to an embodiment of the present application is chamfered. It is a schematic cross-sectional view of the lower edge of the end block.

Referring to FIG. 3, the precast end block 1 may include a protection member 16 provided to surround at least a portion of a lower edge portion of the main body 12.

For example, referring to FIG. 13, the protection member 16 includes a side portion 161 in contact with an outer side surface in the transverse direction of the lower edge portion of the main body 12 and a lower surface portion of the side portion 161 It may include a lower surface portion 162 bent and extended from the lower end. In addition, the protective member 16 may be installed by screwing with the female screw portion 127 for fastening the protective cover embedded in the body 12 corresponding to the side portion 161 or the bottom portion 162. For example, the insert 129 passing through the protection member 16 is screwed to the female threaded portion 127, so that the protection member 16 may be fixed to the body 12. For reference, in FIG. 13, the female screw portion 127 is shown to be formed in a portion corresponding to the side portion 161 of the main body 12, for example, in a portion facing the side portion 161.

In addition, referring to FIG. 3, the protective member 16 may be installed corresponding to the portion wrapped by the wire when the wire is wound and lifted on both sides of the PSC girder including the precast end block 1. have.

For example, when the fabrication of the PSC girder applied to the precast end block 1 is completed, the PSC girder can be lifted and mounted on the pier. When the PSC girder is lifted, the precast end block 1 A protection member 16 may be provided in a portion where the wire is wrapped so that the portion wrapped by the wire can be protected from concentrated stress applied when the wire is in contact. In this way, the protection member 16 can protect the precast end block 1 from damage to the edge (corner) portion or the like. In addition, in addition to lifting the entire PSC girder that has been manufactured, the protective member 16 is also used to lift the precast end block 1 (precast end block 1 pre-manufactured at a separate factory) to the PSC girder production site. It is possible to protect the precast end block 1 from the wire even in the case of lifting performed when carrying in).

In addition, the protection member 16 can prevent damage to the portion of the precast end block 1 where the protection member 16 is installed. For example, when the present precast end block 1 is brought into the PSC girder manufacturing site and seated at a set position, if some seating error (construction error) occurs, the lower edge of the precast end block 1 There is a possibility of damage due to interference such as bumping into other parts unexpectedly. For example, referring to FIG. 13, the present precast end block 1 may be mounted on a guide frame 3 to be described later, and the present precast end block 1 is mounted in the guide frame 3. The lower part of the precast end block 1 seen in the process may be damaged. Since the protection member 16 is configured to surround the lower edge of the precast end block 1, it can prevent damage (breakage) of the edge.

Further, referring to FIG. 14, a corner portion of the lower end of the precast end block 1 may have a chamfer-treated shape. This may be for easy entry of the present precast end block 1 into the guide frame 3. When the lower edge of the precast end block 1 has a chamfered shape, the protection member 16 is the precast end block 1 seen between the side portion 161 and the bottom portion 162 It may include a slope portion 163 having a shape corresponding to the chamfered portion of the corner portion of the lower end of the.

For reference, FIG. 15 is a schematic conceptual diagram of a cross section D-D of FIG. 3, and FIG. 16 is a schematic conceptual diagram of a cross section G-G of FIG. 1.

Further, referring to FIG. 1, the present precast end block 1 may include a sole plate (not provided with reference numerals).

In addition, the present application provides a PSC girder according to an embodiment of the present application. The PSC girder according to an embodiment of the present application includes a precast end block 1 according to an embodiment of the present application described above.

In addition, the present application provides a bridge according to an embodiment of the present application. A bridge according to an embodiment of the present application includes a PSC girder according to an embodiment of the present application described above.

On the other hand, hereinafter, a method of manufacturing a PSC girder using the precast end block 1 according to an embodiment of the present application (hereinafter referred to as'the present PSC girder manufacturing method') will be described. However, the present PSC girder manufacturing method uses the precast end block 1 according to an embodiment of the present application described above, and has the same technical characteristics as or corresponding to the precast end block 1 according to an embodiment of the present application, and Share the composition. Accordingly, descriptions overlapping with those described in the precast end block 1 according to the exemplary embodiment of the present disclosure will be simplified or omitted, and the same reference numerals will be used for the same or similar configurations.

The present PSC girder manufacturing method includes a step (first step) of arranging two bone precast end blocks 1 corresponding to each of the end portions on both sides of the PSC girder in the longitudinal direction.

17 is a schematic perspective view showing that a plurality of guide frames are arranged in a method for manufacturing a PSC girder using a precast end block according to an embodiment of the present application, and FIG. 18 is a schematic cross-sectional view of the guide frame of FIG. 17, 19 is a schematic perspective view for explaining the arrangement of a guide frame and a mounting member in a method of manufacturing a PSC girder using a precast end block according to an embodiment of the present application, and FIG. 20 is a precast according to an embodiment of the present application It is a schematic perspective view for explaining the arrangement of the floor plate of the method for manufacturing a PSC girder using end blocks, and FIG. 21 is a guide frame of the method for manufacturing a PSC girder using a precast end block according to an embodiment of the present application. It is a schematic cross-sectional view of the lower part of a precast end block according to an embodiment of the present application.

Referring to FIG. 17, the first step may include disposing a guide frame 3 for guiding the placement of the precast end block 1. Referring to FIGS. 17 and 18, the guide frame 3 includes a seating portion 31 on which the precast end block 1 is seated, and a side portion 32 extending upward from both outer sides in the transverse direction of the seating portion 31. It may include.

In addition, the guide frame 3 may be disposed at the point where the present precast end block 1 is to be placed. For example, the first step is the precast end block 1 viewed from the plurality of guide frames 3 It can be arranged at intervals in the longitudinal direction (longitudinal direction of the PSC girder) of the precast end block 1 seen at the position to be arranged. In addition, referring to FIGS. 17 and 18, a through hole 322 may be formed in a side portion 32 of the guide frame 3 in a longitudinal direction. In the first stage, a plurality of bone precast end blocks 1 are arranged, and the steel wire 35 passes through the through holes 322 of each of the plurality of guide frames 3 and extends in the longitudinal direction of the PSC girder. 35) can be provided.

Further, referring to FIG. 19, in the first step, a plurality of guide frames 3 may be disposed, and a plurality of mounting members 4 extending in the transverse direction may be disposed. At least some of the plurality of mounting members 4 may be disposed between the guide frames 3. In addition, at least some of the plurality of mounting members 4 may be disposed along the longitudinal direction at a point where the intermediate portion b of the PSC girder is to be formed. For reference, the mounting member 4 may be a timber.

Further, referring to FIG. 20, in the first step, a floor plate 5 may be disposed on the guide frame 3 and the mounting member 4. The floor plate 5 may be arranged to extend in the longitudinal direction. Accordingly, the floor plate 5 may be provided for a portion where the present precast end block a is to be disposed. In addition, the floor plate 5 may be provided for a portion where the intermediate portion (b) of the PSC girder is to be formed. For reference, the floor plate 5 may be an iron plate.

In addition, for reference, in the present PSC girder manufacturing method, before the first step, the floor where the PSC girder is manufactured can be selected at the site where the PSC girder is manufactured. That is, in the present PSC girder manufacturing method, the guide frame 3 may be disposed after floor leveling is performed.

Further, the first step may include disposing the precast end block 1 on the guide frame 3. Referring to FIG. 21, the precast end block 1 is a guide frame so that at least a portion of the lower portion is inserted between the side portions 32 from the upper side to the lower side, passes between the side portions 32, and is disposed on the seating portion 31. 3) can be placed against.

For reference, arranging the precast end block 1 on the guide frame 3 means that it is seen on the mounting member 4 positioned between the plurality of guide frames 3 and the plurality of guide frames 3. It may mean arranging the precast end block 1. In this case, a floor plate 5 may be provided between the precast end block 1 and the guide frame 3 and between the precast end block 1 and the mounting member 4.

In addition, an inclined surface 321 may be formed on an inner surface of the upper side portion 32 in the transverse direction toward the outer side in the transverse direction toward the upper side. Accordingly, the precast end block 1 can easily enter between the side portions 32 and be easily disposed on the seating portion 31.

In addition, referring to FIG. 14, as described above, when a chamfer is formed at the lower edge of the precast end block 1, the precast end is at the lower portion of the inner surface of the side portion 32 of the guide frame 3 An inclined surface corresponding to the chamfer processing of the lower edge of the block 1 may be formed.

Further, as described above, the present precast end block 1 may include a sole plate (not referenced). Accordingly, the process of setting the sole plate in the first step may be omitted.

In addition, the present PSC girder manufacturing method is a step of arranging a formwork 9 for pouring concrete for the intermediate part (b) of the PSC girder outside the transverse direction of each of the two bone precast end blocks 1 (second Step). In the second step, the formwork 9 can be fastened to the precast end block 1 with its longitudinal outer end as described above.

In addition, the present PSC girder manufacturing method includes the steps of pouring concrete for the intermediate portion (b) of the PSC girder, curing, and demolding the formwork (9).

According to this PSC girder manufacturing method, it is possible to perform the PSC girder manufacturing work more quickly with a small number of personnel compared to the existing on-site manufacturing girder manufacturing method. In addition, according to the present PSC girder manufacturing method, the end (a) of the existing PSC girder for casting on-site is brought into the site in the form of a block manufactured in advance at the factory and placed in place as a substitute for the end form, and then the general part (middle part ( b) As a method of manufacturing a girder by carrying out rebar work (rebar assembly), it is possible to assemble a reinforcing bar quickly with fewer personnel compared to the existing assembly method, and a complex girder manufacturing process is performed in a factory, and a relatively simple girder manufacturing process is Easy and very advanced girder manufacturing methods can be implemented in the field.

It can be said to be a longitudinal hybrid PSC girder manufactured by this method of manufacturing a PSC girder.

As described above, the present application is a method of setting the precast end block 1, which is a pre-fabricated precast member, on the site, pre-fabricated precast member (main precast end block 1) and post-cast concrete (intermediate). (b) Through the method of fastening the formwork (9) for pouring concrete for formation), through the protrusion 125 that amplifies the design shear resistance between the precast member surface and the concrete interface to be placed after The PSC girder can be manufactured by this method.

The foregoing description of the present application is for illustrative purposes only, and those of ordinary skill in the art to which the present application pertains will be able to understand that it is possible to easily transform it into other specific forms without changing the technical spirit or essential features of the present application. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present application is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present application.

1: precast end block
11: Sheath tube
12: main body
1211: female threaded hole
1219: insert
122: notch
123: step surface
125: protrusion
127: female thread
16: protection member
161: side portion
162: lower surface
163: slope
3: guide frame
31: seat
32: side portion
322: through hole
321: slope
35: steel wire
4: mounting member
5: floor plate
9: formwork
91: protrusion

Claims (13)

As a precast end block applied to the longitudinal outer end of the PSC girder,
A sheath tube corresponding to the PSC girder;
A body having the sheath tube installed therein and including a concrete portion and a reinforcing bar; And
Including a protection member provided to surround at least a portion of the lower edge portion of the body,
The body is provided with a longitudinal length in which the sheath tube can be disposed,
The protection member is installed corresponding to the portion wrapped by the wire when the wire is wound and lifted on both sides of the PSC girder including the precast end block in the longitudinal direction,
The protection member,
A side portion that is in contact with an outer surface in the lateral direction of the lower edge portion and a lower surface portion that is bent and extended from a lower end of the side portion so as to contact a lower surface of the lower edge portion,
The precast end block is installed by screwing with a female screw portion for fastening a protective cover embedded in the body corresponding to the side portion or the bottom portion. The method of claim 1,
The main body is provided to serve as an end formwork for closing the longitudinal outer end when concrete is placed on the intermediate portion of the PSC girder. The method of claim 2,
On the outer side in the transverse direction of the main body, longitudinal ends of the formwork disposed on the outer side in the transverse direction of the middle portion are overlapped and disposed so as to partially overlap each other for pouring concrete into the middle portion,
The body includes a female screw portion exposed on the outer surface in the transverse direction for the partial section so that the longitudinal end of the formwork can be fixed with respect to the outer surface in the transverse direction by screwing,
The precast end block includes a plurality of female screw holes formed at intervals along the vertical direction with respect to the outer surface in the transverse direction. The method of claim 3,
A groove-shaped notch is formed extending along the vertical direction on a surface between the female screw portion and the inner surface in the longitudinal direction of the outer surface in the transverse direction,
At the longitudinal end of the formwork, a protrusion protrudes inward in the transverse direction corresponding to the notch,
By the protrusion inserted into the notch, the precast end block is blocked from flowing into the female thread part of the concrete to be poured when the concrete is poured into the intermediate part. The method of claim 4,
A surface between the notch and the inner surface of the body in the longitudinal direction of the outer surface in the transverse direction is a stepped surface that is recessed inwardly in the transverse direction than a surface between the female threaded portion and the notch,
By the stepped surface, the concrete poured for the intermediate portion is introduced into the stepped space formed between the stepped surface and the formwork with a boundary line formed by the notch. The method of claim 1,
The precast end block is formed with a protrusion protruding in the longitudinal direction so as to increase a contact area with concrete to be poured corresponding to the intermediate part on the longitudinal inner surface of the main body facing the intermediate part of the PSC girder. The method of claim 6,
A plurality of the protrusions are formed at intervals in the vertical direction,
Each of the plurality of protrusions is a linear protrusion that extends continuously in the transverse direction from one of the outer surfaces in the transverse direction on both sides of the main body to the other outer surface to facilitate the fabrication of the formwork for forming the protrusion,
On the outer surface in the transverse direction, a groove-shaped notch is formed extending along the vertical direction,
At the longitudinal end of the formwork, a protrusion protrudes inward in the transverse direction corresponding to the notch,
The body includes a female screw portion exposed on the outer surface in the transverse direction for the partial section so that the longitudinal end of the formwork can be fixed with respect to the outer surface in the transverse direction by screwing,
A surface between the notch and the inner surface of the body in the longitudinal direction of the outer surface in the transverse direction is a stepped surface that is recessed inwardly in the transverse direction than a surface between the female threaded portion and the notch,
The precast end block is that the linear protrusion is covered by the concrete poured for the intermediate portion flowing into the stepped space formed between the stepped surface and the formwork with a boundary line formed by the notch. delete delete A PSC girder comprising a precast end block according to claim 1. A bridge comprising a PSC girder according to claim 10. A method of manufacturing a PSC girder using a precast end block according to claim 1,
(a) arranging the two precast end blocks to correspond to each end of the PSC girder in the longitudinal direction;
(b) arranging a formwork for pouring concrete for the intermediate portion of the PSC girder outside the transverse direction of each of the two precast end blocks; And
(c) pouring concrete for the intermediate portion of the PSC girder, curing, and demolding the formwork. A method of manufacturing a PSC girder using a precast end block. The method of claim 12,
The step (a),
(a1) arranging a guide frame for guiding the arrangement of the precast end blocks; And
(a2) including the step of disposing the precast end block on the guide frame,
The guide frame includes a seating portion on which the precast end block is seated, and a side portion extending upwardly from both outer sides in the transverse direction of the seating portion,
A method of manufacturing a PSC girder using a precast end block is formed on an inner surface of the upper side portion in the transverse direction toward the upper side and an inclined surface toward the outer side in the transverse direction.

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