KR102091719B1 - Precast concrete expansion joint and bridge including the same - Google Patents

Abstract

Disclosed is a precast concrete expansion joint which facilitates construction. The precast concrete expansion joint comprises: a precast block formed to longitudinally cross the gap unit to allow one end thereof to be supported on a first girder and allow the other end thereof to be supported on a second girder; a longitudinal reinforcing bar structure having an upper longitudinal reinforcing bar unit longitudinally extended across an upper portion of the precast block to protrude to both longitudinal sides of the precast block, and a lower longitudinal reinforcing bar unit longitudinally extended across a lower portion of the precast block to protrude to both longitudinal sides of the precast block; and a water stop structure being extended to longitudinally cross the gap unit to allow one longitudinal end thereof to protrude onto the first girder and allow the other longitudinal end thereof to protrude onto the second girder, and including a water stop plate arranged in the precast block. The precast block is made of a material including high-toughness concrete, and the upper longitudinal reinforcing bar unit and the lower longitudinal reinforcing bar unit are made of a material including epoxy.

Description

Precast concrete expansion joints and bridges including them {PRECAST CONCRETE EXPANSION JOINT AND BRIDGE INCLUDING THE SAME}

The present invention relates to a precast concrete expansion joint device and a bridge including the same.

14 is a longitudinal sectional view of a bridge for explaining a conventional expansion joint device.

Referring to FIG. 14, in general, the superstructure of the bridge expands or contracts according to temperature changes, dry shrinkage, creep, and the like, and is moved according to dynamic load, earthquake, and the like according to vehicle traffic. Accordingly, when the bridge is constructed, a space between the two adjacent superstructures is appropriately spaced according to the material, length, and support structure of the bridge deck, and a telescopic joint device is installed between the superstructure and the superstructure.

However, since the railway bridge has a small span and a simple bridge due to the application of the long rail, it requires a lot of expansion and contraction equipment, which requires excessive cost for maintenance of the expansion and contraction equipment. , There are problems such as reduction in safety and durability due to leakage of the expansion joint device.

The background technology of this application is disclosed in Korean Utility Model Publication No. 20-2008-0004752.

The present application is to solve the problems of the prior art described above, to provide a precast concrete expansion and contraction device and a bridge comprising the same, which has less corrosion, prevents leakage into the gap between the girders and the girders, and is easy to construct. The purpose.

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 concrete expansion and contraction device according to an aspect of the present application, so that one end is supported on the first girder and the other end is supported on the second girder so as to cross the gap in the longitudinal direction. A precast block formed; Longitudinal longitudinal reinforcing portions extending across the upper part of the precast block so as to protrude to both sides in the longitudinal direction of the precast block, and the lower part of the precast block so as to protrude toward both sides in the longitudinal direction of the precast block. A longitudinal reinforcing bar structure having a lower longitudinal reinforcing portion extending across the direction; And an index plate extending transversely in the longitudinal direction such that one end in the longitudinal direction protrudes on the first girder and the other end in the longitudinal direction protrudes on the second girder, and is disposed inside the precast block. The structure includes, but the precast block is a material containing high toughness concrete, and the upper longitudinal reinforcement portion and the lower longitudinal reinforcement portion may be a material including epoxy.

In addition, the bridge according to an aspect of the present application may include a precast concrete expansion and contraction device according to an aspect of the present application.

The above-described problem solving means are merely exemplary and should not be construed as limiting the present application. In addition to the exemplary embodiments described above, 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, since pre-production is possible in the form of a precast, construction is easy and quality can be excellent. In addition, since the precast block is formed of high toughness concrete having a large tensile force, and the longitudinal reinforcing bar structure is made of a material containing epoxy, stretching force in the longitudinal direction can be secured, and the precast block is the first girder. Since the gap between the and the second girder is provided in the longitudinal direction, and the index plate of the index structure in the precast block can be provided in the longitudinal direction across the gap, it is possible to secure a degree effect on the gap, In addition, since the upper longitudinal rebar portion and the lower longitudinal rebar portion are made of a material containing epoxy, corrosion does not occur in the longitudinal rebar structure, so maintenance may not be necessary. Accordingly, there is no corrosion, and maintenance is unnecessary, which is economically advantageous, and the durability performance of the bridge is dramatically improved by the order effect on the gap, so that the long life of the bridge can be secured even without maintenance, and it is a general new construction. Compared to the device, a precast concrete expansion and contraction device with simple construction can be implemented.

1 is a schematic longitudinal sectional view of a bridge in which a precast concrete telescopic joint device is constructed according to an embodiment of the present application.
2 is a schematic plan view of a bridge in which a precast concrete telescopic joint device is constructed according to an embodiment of the present application.
3 is a cross-sectional view taken along line AA of FIG. 2.
4 is an enlarged view of A of FIG. 1.
Figure 5 is a schematic longitudinal cross-sectional view for explaining the coupling relationship between the precast concrete expansion joint device and the reinforcement structure of the slab according to an embodiment of the present application.
6 is a schematic plan view of a bridge having a wide width, in which a precast concrete expansion and contraction device according to an embodiment of the present application is constructed.
7 is a cross-sectional view taken along line BB of FIG. 6.
8 is an enlarged view of B of FIG. 7.
9 to 13 are schematic longitudinal cross-sectional views for explaining a method for constructing a precast concrete expansion joint according to an embodiment of the present application.
14 is a longitudinal sectional view of a bridge for explaining a conventional expansion joint device.

Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present application pertains may easily practice. However, the present application may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in order to clearly describe the present application in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification.

Throughout the present specification, when a part is "connected" to another part, it is not only "directly connected" but also "indirectly connected" or "electrically connected" with another element in between. "It includes the case where it is.

Throughout the present specification, when a member is positioned on another member “on”, “on the top”, “top”, “bottom”, “bottom”, and “bottom”, it means that a member is on another member. This includes cases where there is another member between the two members as well as when in contact.

Throughout the present specification, when a part “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless specifically stated to the contrary.

In addition, in the description of the embodiment of the present application, terms related to direction or position (upper, lower, etc.) are set based on the arrangement state of each component shown in the drawings. For example, when looking at FIG. 1, the 12 o'clock direction may be the upper side, and the 6 o'clock direction may be the lower side.

The present invention relates to a precast concrete expansion joint device and a bridge including the same.

Hereinafter, the precast concrete expansion and contraction device (hereinafter referred to as 'this expansion and contraction device') 1 according to an embodiment of the present application will be described.

1 is a schematic longitudinal cross-sectional view of a bridge in which a precast concrete expansion joint according to an embodiment of the present application is constructed, and FIG. 2 is a schematic view of a bridge in which a precast concrete expansion joint according to an embodiment of the present application is constructed Plan view, Figure 3 is a cross-sectional view AA of Figure 2, Figure 4 is an enlarged view of A of Figure 1, Figure 5 is a precast concrete expansion joint according to an embodiment of the present application and the coupling relationship of the reinforcement structure of the slab It is a schematic longitudinal sectional view for explanation.

1 and 2, the present expansion joint device 1 may be applied to the gap portion (a) between the first girder 21 and the second girder 22 neighboring in the longitudinal direction of the bridge. Here, the bridge may be a railway bridge.

1 and 2, the present expansion joint device 1 traverses the gap portion a in the longitudinal direction so that one end is supported by the first girder 21 and the other end is supported by the second girder 22. It includes a precast block 11 to be formed. Referring to FIG. 3, the present expansion joint 1 may be arranged to extend in the lateral direction of the bridge, and the precast block 11 may be arranged to extend in the lateral direction of the bridge. In addition, referring to FIGS. 1 and 4, the height of the precast block 11 may be a height corresponding to (same as) the height of the slab 23 disposed on the girders 21 and 22. The precast block 11 may be pre-fabricated in a separate workshop or the like and disposed on the gap portion a. According to this, construction is simplified, and pre-production of the precast block 11 is possible, so that excellent quality can be secured.

In addition, the precast block 11 is a material containing high toughness concrete. Accordingly, the precast block 11 can secure a greater tensile force than the precast block made of ordinary concrete, and thus the expansion and contraction device 1 has a greater elastic force compared to the case where the precast block 11 is made of ordinary concrete. Can be secured.

In addition, referring to FIGS. 1 and 2, a precast block 11 made of a material containing high toughness concrete covers the gap portion (a) and is disposed to be covered with the plane view reference gap portion (a). Since it can, it can block the leak to the gap part (a). Since the precast block 11 is made of a material containing high toughness concrete, the possibility of water leakage due to cracking or the like when the precast block 11 is stretched can be lowered, so that a more effective order in connection with an exponential structure can be achieved. You can.

In addition, referring to FIG. 4, the present expansion joint 1 includes a longitudinal reinforcing bar structure 12. The longitudinal reinforcing bar structure 12 includes an upper longitudinal reinforcing portion 121 and a precast block extending across the upper portion of the precast block 11 in the longitudinal direction so as to protrude on both sides in the longitudinal direction of the precast block 11. It may include a lower longitudinal reinforcement portion 122 extending across the lower portion of the precast block 11 so as to protrude on both sides in the longitudinal direction of 11).

The upper longitudinal reinforcement portion 121 and the lower longitudinal reinforcement portion 122 are made of epoxy. Accordingly, flexibility in stretching in the longitudinal direction of the upper longitudinal reinforcing bar 121 and the lower longitudinal reinforcing bar 122 can be secured. That is, the present expansion joint device 1 includes a precast block 11 made of a material containing high toughness concrete, and an upper longitudinal reinforcing part 121 passing through the precast block 11 in the longitudinal direction. And by setting the material of the lower longitudinal reinforcing bar portion 122 to a material containing epoxy, it is possible to secure the freedom of stretching of the present expansion joint (1).

In addition, referring to FIGS. 1 and 2, the present expansion joint 1 is not combined with the first girder 21 and the second girder 22 so as to secure a degree of freedom in stretching in the longitudinal direction. It may be disposed in the synthesis section (b1). The non-compositing section (b1) may mean a section in which the slab 23 and the girders 21 and 22 are not integrated through rigid synthesis, etc., and the girders 21 and 22 are in the non-compositing section b1. The shear connecting material protruding from the upper surface (for example, stud, shear reinforcement) may not be provided. The precast block 11 of the expansion and contraction device 1 may be disposed in some sections 11a while traversing the gap portion a in the longitudinal direction among the non-synthesizing sections b1, and order pads 14 to be described later. ) May be disposed in the section 14a corresponding to the entire non-synthesis section b1. The expansion and contraction device 1 can be arranged in a non-synthetic section, thereby ensuring free expansion and contraction. For reference, the composite section b2 may mean a section in which the slab 23 and the girders 21 and 22 operate integrally, and the composite section b2 may be provided with shear bars.

In addition, the longitudinal reinforcing bar structure 12 may include a connecting reinforcing portion 123 interconnecting the upper longitudinal reinforcing portion 121 and the lower longitudinal reinforcing portion 122 in a loop form. For example, in the longitudinal reinforcing bar structure 12, one reinforcing bar may be formed in a loop form to form the longitudinal reinforcing bar structure 12, or two reinforcing bars bent in a U shape may be interconnected to form a loop. This makes it possible to achieve a longitudinal reinforcing bar structure 12. However, the manufacturing method of the longitudinal reinforcing bar structure 12 is not limited to this, and may be manufactured in various ways as necessary.

In addition, referring to Figure 4, the present expansion joint device 1 includes an index structure (13). The index structure 13 includes an index plate 131. The index plate 131 extends across the gap a in the longitudinal direction such that one end in the longitudinal direction protrudes on the first girder 21 and the other end in the longitudinal direction protrudes on the second girder, and the precast block 11 Is placed inside. That is, the index plate 131 may be disposed such that the planar view reference interval a is obscured. By the index plate 131, the order for the gap portion a may be made.

Referring to FIG. 4, the index plate 131 may be disposed between the lower longitudinal rebar 122 and the upper longitudinal rebar 121 in a form supported by the lower longitudinal rebar 122.

In addition, referring to FIG. 4, the index structure 13 is a support connecting the lower longitudinal rebar 122 and the index plate 131 so that the index plate 131 is spaced upwardly from the lower longitudinal rebar 122. It may include a member 132. Since the index plate 131 is disposed upwardly spaced from the lower longitudinal reinforcing portion 122 by the supporting member 132, the flow of fluid (water) into the spacer portion a is more effectively blocked when it is not spaced upwardly. Can be.

For example, the support member 132 extends in the longitudinal direction and is bent from an upper portion that is bent from an upper portion, an upper portion that is bent from the upper portion, and extends in the longitudinal direction, and extends in the longitudinal direction to extend the lower longitudinal rebar portion. It may be in the form of a letter C including a lower portion connected to the 122. The support member 132 is provided on each of the longitudinal direction one side and the other longitudinal side of the index plate 131 to connect the index plate 131 and the lower longitudinal rebar 122.

In addition, referring to FIGS. 1 and 4, the present expansion joint device 1 is disposed on the first girder 21, the gap portion a, and the second girder 22, but is not included in the non-synthetic section b1. It may include an order pad 14 disposed to have elasticity in the direction. Accordingly, the order pad 14 can exert the order effect on the space portion a while securing the stretchability in the longitudinal direction of the present expansion joint 1. For example, the order pad 14 may be a neo pad.

Also, referring to FIG. 4, the precast block 11 may be disposed on the order pad 14. Further, the longitudinal reinforcing bar structure 12 may also be disposed on the order pad 14. However, the longitudinal reinforcing bar structure 12 may be disposed at an interval upward from the order pad 14. That is, the order pad 14 may be disposed in the non-synthetic section b1 in a form (longitudinal length) covering all the longitudinal lengths of the expansion and contraction device 1. For example, the order pad 14 may be disposed over the entire non-synthetic section (see 14a in FIG. 1), but is not limited thereto.

In addition, referring to FIG. 4, the present expansion joint device 1 includes an upper transverse reinforcement portion 151 and a lower portion of the precast block 11 that extend across the upper part of the precast block 11 in the transverse direction. It may include a transverse reinforcement structure 15 having a lower transverse reinforcement portion 152 extending transversely. The lower longitudinal reinforcement portion 122 may be disposed to at least partially contact (connect) on the lower transverse reinforcement portion 152. In addition, the upper transverse reinforcement portion 151 on the upper longitudinal reinforcement portion 121 may be disposed to be at least partially contacted (connected). In addition, the lower transverse reinforcement portion 152 and the upper transverse reinforcement portion 151 may be made of a material containing epoxy.

Also, referring to FIG. 5, the longitudinal reinforcing bar structure 12 or the transverse reinforcing bar structure 15 of the present expansion joint 1 may be connected to the reinforcing bar structure of the slab 23. Specifically, the reinforcement structure of the slab 23 may include a transverse reinforcement 232 and a longitudinal reinforcement 233, the longitudinal reinforcement 233 of the reinforcement structure of the slab 23 is a longitudinal reinforcement structure ( 12).

FIG. 6 is a schematic plan view of a bridge having a wide width with a precast concrete expansion joint according to an embodiment of the present application, FIG. 7 is a BB cross-sectional view of FIG. 6, and FIG. 8 is an enlarged view of B of FIG. 7 .

In addition, when the width source is wide, a pocket space is formed between the present expansion joint 1 and the neighboring expansion joint 1 ', and after assembling the reinforcing bar, it can be filled with a cast-in-place concrete to form a connection.

Specifically, referring to FIGS. 6 to 8, when the present expansion joint 1 is connected to a neighboring expansion joint 1 'adjacent to the other side in the transverse direction, the precast block of the expansion joint 1 On the other side of the lateral direction of (11), the pocket portion 111 for pouring in the field may be formed, which is recessed downward and simultaneously recessed to one side in the lateral direction.

That is, the connecting portion may be formed by securing a space (pocket space) for assembling the rebar and assembling the bottom plate (slab) rebar. Specifically, referring to FIG. 8, the lateral rudder of the precast block 11 is located at the other lateral side of the precast block 11 of the telescopic joint device 1 (the portion at 9:00 in FIG. 8). Since the pocket portion 111 recessed in one side in the lateral direction is formed on the side, a protrusion protruding to the other side in the transverse direction may be formed on the lower side of the pocket portion 111 as an opposite supply. In addition, on the lateral side of the neighboring precast block 11 '(the part at 3 o'clock in FIG. 8), on the lateral side of the neighboring precast block 11'. Since the pocket portion 111 'recessed to the other side in the lateral direction is formed, a protruding portion protruding to one side in the lateral direction may be formed at the lower side of the pocket portion 111' with the opposite supply. A reinforcement assembly space (pocket space) may be secured at an upper side (pocket space) of the protrusion.

In addition, referring to FIG. 8, the pocket space formed by the pocket portion 111 for on-site casting and the pocket portion 111 ′ for neighboring site construction has an upper transverse reinforcing portion 151 and a lower transverse reinforcing portion 152. ) Protrudes, and the neighboring upper transverse reinforcement portion 151 ′ and the neighboring lower transverse reinforcement portion 152 ′ of the neighboring expansion and contraction device 1 ′ may protrude. Referring to FIG. 8, in the pocket space, at least one of an upper transverse rebar 151, a lower transverse rebar 152, a neighboring upper transverse rebar 151 ', and a neighboring lower transverse rebar 152'. Silver slab may be assembled with one or more of the transverse rebar 232 and longitudinal rebar 233.

As described above, when the cast-in-place concrete is filled after the reinforcing bars are assembled, a connection portion may be formed. According to this, the connecting portion, the main expansion joint 1 and the neighboring expansion joint 1 'are synthesized and can be integrally connected.

A connection portion may be formed by filling the on-site pouring concrete in the pocket space formed by the on-site pouring portion 111 and the neighboring-site pouring portion 111 '.

In addition, referring to FIG. 8, a lateral gap c for correcting construction errors may be formed between the pocket portion 111 for field casting and the pocket portion 111 ′ for neighboring field casting.

In addition, a concrete spill prevention pad 17 may be disposed on the transverse gap c to prevent the concrete from flowing downward through the transverse gap c when pouring concrete in the field to the pocket space. Accordingly, when pouring concrete, the flow of concrete into the transverse gap c can be prevented. In addition, the concrete spill prevention pad 17 can also be used as a spacer according to its thickness setting, etc., to guide the reinforcing bar disposed thereon.

According to the above, the present expansion joint device 1 relates to a precast (PRECC) expansion joint system (system), it is possible to pre-fabricate in the form of a precast, so the construction is easy and the quality can be excellent. In addition, the present expansion joint device 1 is installed in the non-synthetic section (b1) can ensure free expansion and contraction. In addition, according to the expansion and contraction device 1, a precast block 11 of a precast type is used, so construction is easy. In addition, the expansion joint 1 can prevent cracking by forming the precast block 11 from high toughness concrete.

Further, according to the expansion and contraction device 1, since the order pad 14 is provided below the precast block 11 within the non-synthesizing section b1, the degree of freedom of the girder expansion and contraction can be secured.

In addition, according to the expansion and contraction device 1, the order by the order pad 14 (single waterproof), the order by the index plate 131 (double waterproof), the upper longitudinal rebar 121 and the lower bell By forming the direction reinforcing bar portion 122 with corrosion-free epoxy reinforcing, it exhibits a water repellent effect by enhancing durability (triple waterproof), and by forming the precast block 11 with high toughness concrete, it prevents water from penetrating. By exerting an effect, it is possible to prevent corrosion of piers and bridge supports by blocking the source of water leakage to the spacer (a) by introducing a concept of quadruple waterproofing to the spacer (a).

According to this expansion joint device 1, there is no corrosion and maintenance is unnecessary, which is economically advantageous. In addition, the durability performance of the bridge has been significantly improved, so that a long-life bridge may be realized without maintenance. In addition, construction may be simpler than that of a general expansion joint device.

In addition, when the width of the bridge is wide, it can be manufactured by adjusting the lateral length of the telescopic joint device 1 according to the temporary weight. That is, when the width of the bridge is wide, it is possible to divide and construct it by dividing it into the expansion joint 1 and the neighbor expansion joint 1 'according to the temporary weight. Accordingly, easy construction is possible even if the width of the bridge is wide.

Hereinafter, a method of constructing a precast concrete expansion joint according to an embodiment of the present application (hereinafter referred to as a 'this construction method') will be described. However, the construction method of the expansion and contraction apparatus relates to the construction method of the expansion and contraction apparatus 1 described above, and the same reference numerals are used for the same or similar components to those described in the above-mentioned salvage expansion and contraction apparatus 1 , Redundant description will be simplified or omitted.

9 to 13 are schematic longitudinal cross-sectional views for explaining a method for constructing a precast concrete expansion joint according to an embodiment of the present application.

Referring to FIG. 9, in the construction method, the girders 21 and 22 to which the shear reinforcing bar 231 is attached to the composite section b2 can be constructed.

In addition, referring to FIG. 10, in the construction method, an order pad 14 may be installed in a non-synthetic section. For reference, the section 14a in which the order pad 14 is installed may be located in the non-synthesis section.

In addition, referring to FIG. 11, in the present construction method, the present expansion joint 1 can be arranged. At this time, the present expansion joint device 1 may include a precast block 11. In addition, the present expansion joint device 1 may include at least one of a longitudinal reinforcement structure 12, an exponential structure 13, and a transverse reinforcement structure 15.

In addition, referring to Figure 12, this construction method is a reinforcement structure of the slab 23 (longitudinal reinforcing bar 233, transverse rebar (not shown in Figure 12) connected to the expansion joint (1) seen and arranged and Can be assembled.

In addition, referring to FIG. 13, in the construction method, concrete can be cast on-site such that a slab 23 connected to the expansion joint 1 is formed.

In addition, the present application provides a bridge according to an embodiment of the present application including the present expansion joint (1). The bridge according to an embodiment of the present application may be a railway bridge, and the bridge according to an embodiment of the present application may include an island (gravel or concrete), and a guideway formed on the island.

The above description of the present application is for illustrative purposes, and those skilled in the art to which the present application pertains will understand that it is possible to easily modify to 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 restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

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

1: telescopic joint
11: Precast block
11a: Section where precast blocks are placed
12: Longitudinal reinforcement structure
121: upper longitudinal rebar
122: lower longitudinal rebar
123: connecting rebar
13: Exponential structure
131: index board
132: support member
14: order pad
14a: the section where the order pad is placed
15: transverse reinforcement structure
151: upper transverse reinforcement
152: lower transverse reinforcement
21: first girder
22: second girder
23: Slab
231: shear bar
232: transverse rebar
233: longitudinal rebar
a: gap
b1: non-synthetic section
b2: synthesis interval
c: transverse gap

Claims (10)

In the expansion joint applied to the gap between the first girder and the second girder neighboring in the longitudinal direction of the bridge,
A precast block formed to cross the gap in the longitudinal direction such that one end is supported on the first girder and the other end is supported on the second girder;
The upper longitudinal reinforcing portion extending in the longitudinal direction across the upper portion of the precast block so as to protrude to both sides in the longitudinal direction of the precast block, and the lower portion of the precast block so as to protrude toward both sides in the longitudinal direction of the precast block. A longitudinal reinforcing bar structure having a lower longitudinal reinforcing portion extending across the direction; And
An exponential structure including an index plate extending transversely in the longitudinal direction such that one end in the longitudinal direction protrudes on the first girder and another end in the longitudinal direction protrudes on the second girder, and disposed inside the precast block. Including,
The precast block is a material containing high toughness concrete,
The upper longitudinal rebar portion and the lower longitudinal rebar portion are materials including epoxy,
The index plate is arranged between the lower longitudinal rebar and the upper longitudinal rebar in a form supported by the lower longitudinal rebar, precast concrete expansion joint. According to claim 1,
The expansion and contraction device is a precast concrete expansion and contraction device that is disposed in an unsynthesized section that is not integrally synthesized with the first and second girders, so as to secure flexibility in stretching in the longitudinal direction. According to claim 2,
Further comprising an order pad disposed on the first girder, the spacer and the second girder, but arranged to have elasticity in the longitudinal direction in the non-synthetic section,
The precast block is disposed on the order pad, a precast concrete expansion joint. According to claim 1,
The longitudinal reinforcing bar structure, a precast concrete expansion and contraction device comprising a connecting rebar connecting the upper longitudinal rebar and the lower longitudinal rebar in a loop form. delete According to claim 1,
The index structure, a precast concrete expansion and contraction device comprising a support member connecting the lower longitudinal rebar portion and the index plate so that the index plate is spaced upwardly from the lower longitudinal rebar portion. According to claim 1,
Further comprising a transverse reinforcement structure having an upper transverse rebar extending transversely across an upper portion of the precast block and a lower transverse rebar extending transversely across a lower portion of the precast block, free Cast concrete expansion joint. The method of claim 7,
When the expansion and contraction device is connected to a neighboring expansion and contraction device adjacent to the other side in the horizontal direction,
On the other side in the transverse direction of the precast block of the telescopic joint device, a pocket portion for pouring in the field is recessed downward and simultaneously recessed in one side in the transverse direction.
On one side in the lateral direction of the neighboring pre-cast block of the neighboring expansion and contraction device, it is recessed downward and at the same time is recessed to the other side in the lateral direction, and a pocket portion for neighboring site casting is formed opposite the pocket portion for field casting
The upper transverse reinforcement portion and the lower transverse reinforcement portion protrude from the pocket space formed by the on-site pocket portion and the neighboring on-site pocket portion, and the neighboring upper transverse reinforcement portion of the neighboring expansion and contraction device and The precast concrete expansion and contraction device, in which the transverse rebars in the lower part of the neighbor protrude. The method of claim 8,
A lateral gap for correcting construction errors is formed between the on-site pocket portion and the neighboring on-site pocket portion,
On the transverse gap, a precast concrete expansion and contraction device is disposed so that a concrete outflow prevention pad is disposed to prevent concrete downward outflow through the transverse gap when pouring concrete in the field to the pocket space. A bridge comprising a precast concrete expansion joint according to claim 1.

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