JP6411836B2 - Joining method and structure between existing structure and replacement member - Google Patents

Description

  The present invention relates to a method and a structure for joining an existing structure and a replacement member, which are joined together by filling concrete between the existing structure and the replacement member.

  Conventionally, when a concrete floor slab in a bridge becomes old, the old concrete floor slab is removed, and a replacement floor slab is disposed as an alternative. Filled concrete is placed in the connecting part formed between the existing floor slab and the replacement floor slab. Moreover, it connects between the reinforcing bar protruded from the end surface of the existing floor slab and the reinforcing bar protruded from the end surface of the replacement floor slab, for example, by a lap joint.

  FIG. 9 is a conventional example of a replacement floor slab 81 to be joined to an existing floor slab. The replacement floor slab 81 protrudes from the end portions 91a and 91b of the replacement floor slab main body 80 with the linear reinforcing bar 92 in a substantially horizontal direction. The reinforcing bar 92 is formed on the replacement floor slab body 80 in two upper and lower stages. As an alternative to such a linear reinforcing bar 92, a loop-shaped joint in which two upper and lower reinforcing bars are formed in an arc shape in the floor slab thickness direction may be embedded in the replacement floor slab body 80.

  The replacement floor slab 81 having such a configuration is a horizontally long floor slab in a direction perpendicular to the bridge axis. When such a replacement floor slab 81 is joined to the existing floor slab 100, for example, as shown in FIG. 10, the reinforcing bar 101 protruding from the existing floor slab 100 and the replacement floor slab 81 are protruded. A lap joint is formed with the reinforcing bar 92. The reinforcing bars 101 and the reinforcing bars 92 are arranged to be alternated in a plan view, and reinforcing reinforcing bars 95 are arranged between the reinforcing bars 101 and the reinforcing bars 92 in a direction perpendicular to the bridge axis direction. The reinforcing reinforcing bar 95 and the reinforcing bar 101 or the reinforcing bar 92 may be bound together by a binding wire such as a wire as necessary. After that, the interstitial concrete 97 is placed at the joint interval C formed between the existing floor slab 100 and the replacement floor slab 81 (see, for example, Patent Document 1).

JP 2007-231369 A

  However, the above-described joining method via a lap joint has the following problems.

  First, as a first problem, when the above-described lap joint is used, the joint interval C between the joints becomes long. As a result, the labor for placing the interstitial concrete 97 increases, and the construction time associated with this increases. In particular, in order to perform the replacement work with the replacement floor slab 81, it is necessary to regulate the traffic, and if the amount of the stuffed concrete 97 to be placed increases, the traffic regulation time becomes longer accordingly. Problems arise. In addition, if the amount of the interstitial concrete increases, there is a problem that the material cost increases accordingly.

  Further, as a second problem, there may be a case where information such as a drawing at the time of construction does not remain for the existing floor slab 100. In such a case, when the lap joint is formed with the existing floor slab 100, the arrangement state of the reinforcing bars 101 of the existing floor slab 100 becomes unclear. For this reason, it is necessary to perform a so-called pre-work in which excavation work is performed once and the arrangement state of the reinforcing bars 101 embedded in the concrete of the existing floor slab 100 is confirmed, and the construction time is further prolonged. In addition, the arrangement state of the reinforcing bars 101 specified through the drawings and the preliminary work may differ from the actual arrangement state of the reinforcing bars 101, and the construction time may be further prolonged.

  As a third problem, when a lap joint is employed, when a mechanical joint using a screw or the like is used, assembly adjustment at the site is required, and the construction time is further prolonged.

  Further, as a fourth problem, when a lap joint is employed, it takes more time to construct a reinforcing bar that can be joined by driving a post-construction anchor.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to join the existing structure and the replacement member with each other by filling the interstitial concrete. On the above, it is providing the joining method of the existing structure and replacement member which can shorten construction time and can reduce material cost.

The method for joining an existing structure and a replacement member according to claim 1 is a method of joining an existing structure and a replacement member that are joined together by filling the space between the existing structure and the replacement member. In the joining method, the end surface of the existing structure that is formed by projecting the linear existing rebar embedded in the concrete of the existing structure and the end surface of the replacement member that is formed by projecting the joint rebar So that the interposition reinforcing bars are separated from each other between the existing structure and the replacement member, and a lap joint is formed between the joint reinforcing bars. It is characterized by being filled with the above-mentioned space concrete after being disposed.

  According to a second aspect of the present invention, there is provided a method for joining an existing structure and a replacement member to the joint reinforcing bar as a loop reinforcing bar according to the first aspect of the invention. It is characterized by forming a lap joint by overlapping.

  According to a third aspect of the present invention, there is provided a method for joining an existing structure and a replacement member, wherein the interposing reinforcing bar is an endband reinforcing bar in which a steel pipe is crimped to the tip. The lap joint is formed with a steel pipe crimped to the tip.

  The joining method of the existing structure according to claim 4 and the replacement member is the invention according to any one of claims 1 to 3, wherein the end of the interposing reinforcing bar is bent into a hook shape; It is fixed between the existing reinforcing bars through the interstitial concrete.

The joint structure between the existing structure and the replacement member according to claim 5 is replaced with the existing structure joined together by filling the space between the existing structure and the replacement member. In the joining structure with the structural member, the end surface of the existing structure, which is formed by projecting the existing linear reinforcing bar embedded in the concrete of the existing structure , and the joint member, the joint member is projected. The interposing reinforcing bars are disposed between the existing structure and the replacement member, and the interposing reinforcing bars are separated from each other with the existing reinforcing bars. And a lap joint is formed between the joint reinforcing bars.

  The joint structure between the existing structure and the replacement member according to claim 6 is the invention according to claim 5, wherein the joint rebar is a loop rebar, and the interposition rebar is a loop-shaped bent portion. Is formed by forming a lap joint by overlapping the loop rebar.

  The joint structure between the existing structure and the replacement member according to claim 7 is such that the joint rebar is an endband rebar having a steel pipe crimped to a tip, and the interposition rebar forms a lap joint with the joint rebar. It is characterized in that a steel pipe is crimped to its tip.

  The joint structure between the existing structure and the replacement member according to claim 8 is the invention according to any one of claims 5 to 7, wherein an end portion of the interposition reinforcing bar bent in a hook shape is used. It is fixed between the existing reinforcing bars through the interstitial concrete.

  According to the present invention having the above-described configuration, on the replacement slab side, since the lap joint is formed between the interposing reinforcing bar and the joint reinforcing bar, it is possible to firmly join each other. . In addition, on the existing floor slab side, it is possible to join with sufficient strength by adopting a structure in which the reinforcing bars are fixed between the existing reinforcing bars and the existing reinforcing bars through the interstitial concrete. In this joint structure to be fixed, the interposing reinforcing bars and the existing reinforcing bars are only fixed through the interstitial concrete, but this also makes it possible to express the above-mentioned effect.

  In particular, the joint space formed between the existing floor slab and the replacement floor slab should be shortened by fixing it via interstitial concrete without applying lap joints on the existing floor slab side. Can do. As a result, it is possible to reduce the labor for placing the interstitial concrete and to shorten the construction time. In particular, the traffic regulation time for performing the replacement work with the replacement slab can also be shortened. Furthermore, the amount of the concrete to be packed can be reduced, and the material cost can be suppressed.

  Further, in the present invention, on the existing floor slab side, since the fixing structure using the interstitial concrete is interposed between the reinforcing bars for installation and the existing reinforcing bars, information such as drawings at the time of construction remains on the existing floor slab. Even if it is not, joining can be performed independently of this. For this reason, it is not necessary to perform excavation work once in order to confirm the arrangement situation of the reinforcing bars of the existing floor slab, and it is possible to prevent an increase in construction time associated therewith.

  Further, in the present invention, on the existing floor slab side, since it is fixed between the interposing reinforcing bars and the existing reinforcing bars through the interstitial concrete, assembly adjustment of the mechanical joint is also required when the conventional lap joint is adopted. The construction time can be further shortened.

It is a top view of the junction structure to which the present invention is applied. It is sectional drawing of the junction structure to which this invention is applied. It is a side view of the floor slab for replacement used for the junction structure to which the present invention is applied. It is a figure for demonstrating the intervention reinforcement used for the joining structure to which this invention is applied. It is a figure for demonstrating the example in case the vertical space | interval of the two-stage existing reinforcing bar protruded from the existing floor slab is narrow. It is a sectional side view of the replacement floor slab from which the loop reinforcement was projected. It is a figure for demonstrating the other example of the interposition reinforcing bar used for the joining structure to which this invention is applied. It is sectional drawing of the other example of the joining structure to which this invention is applied. It is a figure for demonstrating the prior art example of the replacement floor slab joined to an existing floor slab. It is a figure for demonstrating the joining structure of the existing structure and the member for replacement in the past.

  Hereinafter, as an embodiment of the present invention, a joint structure between an existing structure and a replacement member will be described in detail with reference to the drawings.

  FIG. 1 is a plan view of a joining structure 1 to which the present invention is applied, and FIG. 2 is a sectional view thereof. The joint structure 1 is applied to repair a part of a concrete floor slab in a bridge, for example, when it is damaged or deteriorated. When this joining structure 1 is applied, a gap is provided between the existing floor slabs 2 not to be replaced by removing the concrete floor slabs to be repaired. The replacement floor slab 3 is disposed in the gap. Further, between the existing floor slab 2 and the replacement floor slab 3, interposing reinforcing bars 5 are disposed, and then the interstitial concrete 4 is placed.

  An existing reinforcing bar 21 is embedded in the existing floor slab 2 in the direction of the bridge axis, and its end protrudes from the end surface 2a. A reinforcing reinforcing bar 22 is embedded in the existing floor slab 2 in a direction perpendicular to the bridge axis. The reinforcing reinforcing bars 22 are attached to the existing reinforcing bars 21 while being orthogonal to the existing reinforcing bars 21.

  As shown in the side view of FIG. 3, the replacement floor slab 3 is fitted with steel tubular bodies 31 at both ends of a reinforcing bar having a predetermined length and is crushed and deformed by the reinforcing bar. A fixed crimp grip (end band) 32 is formed, and an upper joint rebar 30a and a lower joint rebar 30b made of a joint rebar with a crimp grip (joint rebar with an end band) are configured.

  Since the upper joint rebar 30a and the lower joint rebar 30b made of joint rebars with a crimping grip do not require hot working such as thermoforming on the rebars, commercially available rebars can be used, and the steel tubular body 31 Also, commercially available inexpensive members can be used. Moreover, the steel cylindrical body 31 has a freedom degree also about the length. Moreover, compared with the case of using a custom-made reinforcing bar having an enlarged diameter end part that gradually expands the end part of the reinforcing bar, the upper joint reinforcing bar 30a and the lower joint reinforcing bar 30b made of the joint reinforcing bar with a crimping grip used in the present invention are used. Can use various kinds of commercially available reinforcing bars and steel cylinders, has a much higher degree of freedom in manufacturing, and is easy to manufacture.

  The upper joint rebar 30a and the lower joint rebar 30b, which are joint rebars with a crimping grip, are located at predetermined positions on the upper and lower sides as part of the floor slab reinforcing bar, and the crimping grips 32 are located at both ends in the bridge axis direction. The replacement floor slab 3 is configured by placing and hardening the concrete so as to bury the intermediate portion of the reinforcing bar.

  Further, the upper floor slab end surface 34 from which the upper joint reinforcing bar 30a is projected is provided so as to be located closer to the center part in the bridge axis direction than the lower floor slab end surface 35 from which the lower joint reinforcing bar 30b is projected. . Thus, the width between the upper floor slab end faces 34 is provided to be narrower than the width between the lower floor slab end faces 35.

  Between the upper floor slab end surface 34 and the lower floor slab end surface 35, a step portion 137 having an inclined surface or a flat surface continuous in a direction perpendicular to the bridge axis may be provided. The base end portion of the upper joint reinforcing bar group of the upper joint reinforcing bars 30a and the stepped portion 137 allow the temporary storage groove 138 for the joint reinforcing bar in the direction perpendicular to the bridge axis to continuously extend in the direction perpendicular to the bridge axis. Is formed.

  Further, as shown in FIG. 4, the intervention reinforcing bar 5 has an end portion 53 formed by bending a single reinforcing bar into a hook shape. The end 53 may be bent with a curvature. In addition, a steel tubular body 51 is fitted to the other end of the interposing reinforcing bar 5, and a crimping grip (end band) 52 that is crushed and deformed by the reinforcing bar and fixed by crimping is formed.

  When the joining structure 1 is constituted by the existing floor slab 2, the replacement floor slab 3, and the interposing reinforcing bars 5 having the above-described configuration, the end surface 2a of the existing floor slab 2 and the upper part of the replacement floor slab 3 The floor slab end surface 34 and the lower floor slab end surface 35 are arranged to face each other with a space therebetween. As a result, the existing reinforcing bar 21 protruding from the end surface 2a of the existing floor slab 2, the upper floor slab end surface 34 of the replacement floor slab 3, the upper joint reinforcing bar 30a and the lower joint reinforcing bar 30b protruding from the lower floor slab end surface 35 are provided. It will be arrange | positioned so that it may become alternate by planar view.

  Further, the interposing reinforcing bars 5 are provided between the existing floor slab 2 and the replacement floor slab 3. In the example of FIG. 2, the end 53 of the intervention reinforcing bar 5 is brought close to the existing floor slab 2 side, and the crimping grip 52 is brought close to the replacement floor slab 3 side. At this time, as shown in FIG. 1, the interposing reinforcing bars 5 are arranged at positions separated from each other among the existing reinforcing bar 21, the upper joint reinforcing bar 30 a, and the lower joint reinforcing bar 30 b in a plan view. Moreover, when arrange | positioning this reinforcement bar 5, you may make it provide this over two steps up and down. This is because a lap joint is formed on each of the upper joint rebar 30a and the lower joint rebar 30b provided over two upper and lower stages. That is, the interposing reinforcing bar 5 provided on the upper side is in a state in which the hook of the end portion 53 is extended from the bottom to the top, and the interposing reinforcing bar 5 provided on the lower side is directed to the hook of the end portion 53 from the top to the bottom. And arranged in an extended state. Moreover, the side where the crimping | compression-bonding grip 52 in the interposing reinforcing bar 5 is provided is comprised so that it may become respectively substantially the same height as the upper joint reinforcement 30a and the lower joint reinforcement 30b.

  The interposing reinforcing bars 5 are separated from the existing reinforcing bars 21 in the existing floor slab 2 and then fixed via the interstitial concrete 4. In addition, the intervention reinforcing bar 5 is disposed so as to be a lap joint between the upper joint reinforcing bar 30a and the lower joint reinforcing bar 30b. Actually, the existing reinforcing bars 21 and the end portions 53 of the intervention reinforcing bars 5 are separated from each other in plan view, and constitute a joint structure that is fixed without being particularly connected via the reinforcing bars. In adopting the structure fixed through the interstitial concrete 4, the reinforcing reinforcing bars 38 are arranged toward the direction perpendicular to the bridge axis, in other words, toward the depth side of the paper surface in FIG. 2.

  On the other hand, the distance d between the crimping grip 52 in the interposing reinforcing bar 5 and the crimping grip 32 in the upper joint reinforcing bar 30a and the lower joint reinforcing bar 30b overlaps the interposing reinforcing bar 5 and the joint reinforcing bar 30. Length. In the present invention, the lap joint is formed at least at the distance d.

  In configuring this lap joint, the reinforcing reinforcing bars 37 are arranged toward the direction perpendicular to the bridge axis, in other words, toward the depth side of the drawing in FIG. The reinforcing reinforcing bar 37, the interposing reinforcing bar 5 and the joint reinforcing bar 30 are bound together by a binding wire such as a number wire as necessary. In particular, since the upper joint rebar 30a and the lower joint rebar 30b in the replacement floor slab 3 are so-called endband rebars provided with a crimp grip 32 at the tip, the end of the interposing rebar 5 is also corresponding to this end band rebar. By forming the crimping grip 52 on the part, it is possible to suitably form the lap joint.

  After the interposing reinforcing bars 5 are arranged in such a state, the interstitial concrete 4 is filled. Thereby, the edge part 53 bent in the hook shape in the interposing reinforcing bar 5 and the padded concrete 4 can be fixed, and it becomes possible to express the expected effect as a joint structure. In particular, since the end portion 53 is bent in a hook shape, the hook portion can resist the tensile stress applied in the direction of the bridge axis, thereby preventing pull-out. It is possible to realize a firm fixation with the interstitial concrete 4.

  Since the existing reinforcing bar 21 protruding from the existing floor slab 2 is separated from the replacement floor slab 3 for replacement, the desired performance is maintained by lapping only the existing reinforcing bar 21. It becomes possible to do.

  According to the joining structure 1 having the above-described configuration, on the replacement floor slab 3 side, a lap joint is formed between the interposing reinforcing bar 5 and the upper joint reinforcing bar 30a and the lower joint reinforcing bar 30b. It becomes possible to firmly join each other. Further, on the existing floor slab 2 side, it is possible to join with sufficient strength by adopting a structure in which the interposing reinforcing bar 5 and the existing reinforcing bar 21 are fixed via the interstitial concrete 4. . In this joint structure to be fixed, the interposing reinforcing bars 5 and the existing reinforcing bars 21 are only fixed through the interstitial concrete 4, but this also makes it possible to express the above-mentioned effect. .

  In particular, the joint spacing formed between the existing floor slab 2 and the replacement floor slab 3 by fixing through the interstitial concrete 4 without applying a lap joint on the existing floor slab 2 side. e can be shortened. As a result, it is possible to reduce the labor for placing the interstitial concrete 4 and to shorten the construction time. In particular, the traffic regulation time for performing the replacement work by the replacement floor slab 3 can also be shortened. Furthermore, the amount of the space-filled concrete 4 required can be reduced, and the material cost can be suppressed.

  Further, in the present invention, on the existing floor slab 2 side, a fixing structure through the interstitial concrete 4 is adopted between the interposing reinforcing bars 5 and the existing reinforcing bars 21. Even if there is no remaining information, joining can be performed regardless of this. For this reason, it is not necessary to perform excavation work once in order to confirm the arrangement state of the reinforcing bars of the existing floor slab 2, and it is possible to prevent an increase in construction time associated therewith.

  Further, in the present invention, on the existing floor slab 2 side, the mechanical joint in the case of adopting a conventional lap joint is used for fixing between the interposing reinforcing bar 5 and the existing reinforcing bar 21 via the interstitial concrete 4. Assembly adjustment is not necessary, and the construction time can be further shortened.

  The present invention is not limited to the embodiment described above. For example, as shown in FIG. 5, when the vertical distance between the two existing reinforcing bars 21 protruding from the existing floor slab 2 is narrow, only the upper existing reinforcing bars 21 may be bent upward to adjust the distance. . Thereby, it becomes possible to expand the space | interval of the existing reinforcement 21 over 2 steps | paragraphs up and down. And it becomes possible to join these existing reinforcing bars 21 diameter-expanded across the upper and lower sides by fixing between the interposing reinforcing bars 5 via the interstitial concrete 4.

  Furthermore, in the present invention, as shown in the replacement floor slab 3 ′ shown in FIG. 6, even when the reinforcing bar protruding from the end surface is a looped reinforcing bar 39, the same can be realized. In this replacement floor slab 3 ′, the same components and members as those of the replacement floor slab 3 described above are denoted by the same reference numerals, and the following description is omitted.

  One end of the loop reinforcing bar 39 protrudes from the upper floor slab end surface 34, and the other end protrudes from the lower floor slab end surface 35. The loop reinforcing bar 39 is formed so that one end protruding from the end face 34 of the upper floor slab is extended in a substantially horizontal direction as it is and bent gradually downward to draw a loop 40. One end protruding from the lower floor slab end surface 35 is extended in the substantially horizontal direction as it is, and is bent so as to gradually bend upward and draw a loop 40. The loop reinforcing bar 39 is continuous from one bent end to the other end, and is formed so as to draw an arcuate loop 40 from the bent one end to the other end. The loop 40 in the loop reinforcing bar 39 is not necessarily configured in an arc shape, and may be configured in any shape.

  FIG. 7 shows a configuration of an interposing rebar 5 ′ that forms a lap joint with the replacement floor slab 3 ′. The loop 55 is shaped to draw an arc-shaped loop, and is extended from one end of the loop 55 as it is in a substantially horizontal direction, and then bent so as to gradually draw an arc toward the lower side. A bent portion 56a and a bent portion 56b that extends from the other end of the loop 55 as it is in the substantially horizontal direction and is bent so as to gradually draw an arc toward the upper side are provided. By the way, the interposing reinforcing bar 5 'is not limited to the form shown in FIG. 7, but only one end thereof is extended in a substantially horizontal direction as long as the loop 55 is formed. Also good. Moreover, the structure of the bending parts 56a and 56b is not essential, and may be omitted. Further, the loop 55 is not limited to a case where the loop 55 is configured in an arc shape, and may be configured in any other shape.

  When the joining structure 1 is configured in relation to the existing floor slab 2 by the replacement floor slab 3 ′ and the interposing reinforcing bars 5 ′ having the above-described configuration, as shown in FIG. And the upper floor slab end surface 34 and the lower floor slab end surface 35 of the replacement floor slab 3 'are disposed so as to face each other with a space therebetween. As a result, the existing reinforcing bars 21 projecting from the end surface 2a of the existing floor slab 2 and the loop reinforcing bars 39 of the replacement floor slab 3 are arranged to be alternated in plan view.

  Further, an interposing reinforcing bar 5 'is provided between the existing floor slab 2 and the replacement floor slab 3'. In the example of FIG. 8, the bent portions 56 a and 56 b in the interposing reinforcing bar 5 ′ are brought close to the existing floor slab 2 side. At this time, the interposing reinforcing bars 5 ′ are arranged at positions separated from each other between the existing reinforcing bars 21 and the loop reinforcing bars 39 in a plan view.

  The interposing reinforcing bars 5 ′ are arranged so as to be fixed via the interstitial concrete 4 between the existing reinforcing bars 21 in the existing floor slab 2. Further, the intervention reinforcing bar 5 is disposed so as to be a lap joint with the loop reinforcing bar 39. Actually, the existing reinforcing bar 21 and the bent portion 56 in the intervention reinforcing bar 5 'are separated from each other in a plan view, and in particular have a structure in which they are fixed without being connected via the reinforcing bar. In constructing such a structure, a reinforcing bar 38 is arranged in a direction perpendicular to the bridge axis, in other words, toward the depth side of the paper surface in FIG. 2, but this reinforcing bar 38 is only used to form a joint. However, it is not essential, and it is not particularly required to be bound by a binding wire such as a number wire.

  On the other hand, in constructing the lap joint with the loop reinforcing bar 39 in the interposing reinforcing bar 5, the reinforcing reinforcing bar 37 is directed in the direction perpendicular to the bridge axis, in other words, toward the depth side of the page in FIG. Arranged. The reinforcing reinforcing bar 37, the interposing reinforcing bar 5 and the loop reinforcing bar 39 are bound by a binding wire such as a number wire as necessary. In particular, since the interposing rebar 5 in the replacement floor slab 3 is a loop rebar 39 bent in a loop shape, the lap joint is formed by forming the loop 55 in the interposing rebar 5 corresponding to this. It becomes possible to form suitably.

  After arranging the interposing reinforcing bars 5 'in such a state, the interstitial concrete 4 is filled. As a result, the bent portion 56 bent in the hook shape in the interposing reinforcing bar 5 ′ and the interstitial concrete 4 can be fixed, and the above-described desired effect can be expressed as a joint. In particular, since the bent portion 56 is bent in a hook shape, the hook portion can resist the tensile stress applied in the direction of the bridge axis, thereby preventing pull-out. It is possible to realize a firm fixation with the interstitial concrete 4.

  Therefore, even when the replacement floor slab 3 ′ is used, it is possible to obtain the same operational effects as when the replacement floor slab 3 is used.

  Of course, the present invention is also applicable as a joining method between the existing floor slab 2 and the replacement floor slabs 3 and 3 '. In such a case, the existing floor slab 2 and the replacement floor slabs 3 and 3 'are arranged with a space therebetween, and the existing reinforcing bar 21 and the interposing reinforcing bars 5 and 5' are separated from each other. Further, the interposing reinforcing bars 5, 5 ′ and the joint reinforcing bar 30 and the loop reinforcing bar 39 are arranged so as to form a lap joint. By filling the interstitial concrete 4 thereon, the above-described joint structure 1 can be formed.

  Furthermore, the present invention is not limited to the repair of bridges, and can be applied to repair of all existing structures. In such a case, the area where the existing structure to be repaired is not replaced is regarded as the existing floor slab 2, and the member to be replaced is regarded as the replacement floor slab 3, 3 '. Joining will be performed.

  In the present invention having the above-described configuration, it is needless to say that the repair of the bridge can be applied not only to the repair in the direction of the bridge axis but also to the repair in the direction perpendicular to the bridge axis.

DESCRIPTION OF SYMBOLS 1 Junction structure 2 Existing floor slab 3 Replacement floor slab 4 Filling concrete 5 Interposition reinforcement 21 Existing reinforcement 22 Reinforcement reinforcement 30a Upper joint reinforcement 30b Lower joint reinforcement 31 Steel cylindrical body 32 Crimp grip 34 Upper floor slab end face 35 Lower floor slab end face 37 Reinforcing bar 38 Reinforcing bar 39 Loop reinforcing bar 40 Loop 51 Steel tubular body 52 Crimp grip 53 End 55 Loop 56 Bending part 80 Replacement floor slab body 81 Replacement floor slab 92 Reinforcing bar 95 Reinforcing bar 97 Concrete 100 Existing floor slab 101 Reinforcing bar 137 Step part 138 Housing groove

Claims (8)

In the joining method of the existing structure and the replacement member that are joined together by filling the interstitial concrete between the existing structure and the replacement member,
The end surface of the existing structure formed by projecting a linear existing reinforcing bar embedded in the concrete of the existing structure and the end surface of the replacement member formed by projecting a joint reinforcing bar are spaced apart from each other. The interposing reinforcing bars are spaced apart from each other between the existing structure and the replacement member, and are disposed so as to form a lap joint between the joint reinforcing bars and the above A method of joining an existing structure and a replacement member, characterized by filling in the concrete. The existing structure and the replacement member according to claim 1, wherein a lap joint is formed by superimposing a loop-shaped bent portion of the interposing reinforcing bar on the joint reinforcing bar which is a loop reinforcing bar. Joining method. The existing lap joint is formed between the joint rebar, which is an endband rebar with a steel pipe crimped to the tip, and the steel pipe crimped to the tip of the interposition reinforcing bar. A method of joining the structure and the replacement member. 4. The fixing device according to claim 1, wherein the interstitial reinforcing bar is fixed between the end portion bent into a hook shape and the existing reinforcing bar through the interstitial concrete. 5. Joining method of existing structure and replacement member. In the joint structure between the existing structure and the replacement member that are joined together by filling the interstitial concrete between the existing structure and the replacement member,
The end surface of the existing structure formed by projecting a linear existing reinforcing bar embedded in the concrete of the existing structure and the end surface of the replacement member formed by projecting a joint reinforcing bar are spaced apart from each other. Facing each other,
An interposing rebar is disposed between the existing structure and the replacement member,
The joining structure of an existing structure and a replacement member, wherein the intervention reinforcing bars are separated from each other with the existing reinforcing bars and are formed with lap joints with the joint reinforcing bars. The joint rebar is a loop rebar,
6. The existing structure and the replacement member according to claim 5, wherein the intervention rebar is formed by forming a lap joint by overlapping the loop-shaped bent portion with the loop rebar. Bonding structure. The joint rebar is an end band rebar with a steel pipe crimped to the tip.
6. The joining structure of an existing structure and a replacement member according to claim 5, wherein the interposing reinforcing bars are formed by crimping a steel pipe at a tip thereof that forms a lap joint with the joint reinforcing bars. 8. The fixing device according to claim 5, wherein the interstitial reinforcing bar is fixed between the end portion bent in a hook shape and the existing reinforcing bar through the interstitial concrete. 9. Of the existing structure and replacement member.

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