JP2021095804A - Joint structure, sleeve joint, and method of constructing joint structure - Google Patents

Abstract

To provide a new joint structure that can prevent reinforcing bars from protruding from a PCa member except during the joining construction in the joint structure of the reinforcing bars of the PCa member using a sleeve joint.SOLUTION: A joint structure 1 joins a buried reinforcing bar 61 in a first PCa member 71 and a buried reinforcing bar 63 in a second PCa member 73 through a first type sleeve joint 10, a second type sleeve joint 30, and an insertion reinforcing bar 5 whose one end is located in a first type sleeve 11 of the first type sleeve joint and whose the other end is located in a second type sleeve 31 of the second type sleeve joint 30. Further, the first type sleeve joint 10 has a configuration that when the insertion reinforcing bar 5 is inserted from one opening 111 of the first type sleeve 11, a spring member 13 in the first type sleeve 11 is elastically deformed so that the entire insertion reinforcing bar 5 is housed in the first type sleeve 11 (pushed state), and a part (the other end side) protrudes when the pushed state is released.SELECTED DRAWING: Figure 3

Description

The present invention relates to a joining structure for joining reinforcing bars of PCa (precast concrete) members and the like.

Conventionally, a reinforced concrete structure using a precast concrete member (PCa member) and a construction method thereof have been proposed, and are called sleeve joints and grout-filled joints (hereinafter collectively referred to as "sleeve joints"). A joining structure for joining the reinforcing bars of a PCa member using a joint has been proposed. For example, in Patent Document 1, a reinforcing bar protruding from one PCa member to be joined is inserted into a tubular sleeve (sleeve joint member) embedded in the other PCa member, and the sleeve joint member is grouted. A method of joining by filling is disclosed.

JP-A-2017-95915

However, in the conventional method disclosed in Patent Document 1 and the like, since the PCa member is formed in a state where the reinforcing bar is projected, protective measures for the protruding reinforcing bar during shipping, transportation, and temporary placement of the PCa member are performed. Special consideration was required for the reinforcing bars in the protruding state, such as erection and alignment in consideration of the protruding reinforcing bars.

The problem to be solved by the present invention is to provide a new joint structure in which the reinforcing bars of the PCa member using the sleeve joint can be joined so that the reinforcing bars do not protrude from the PCa member except at the time of joining. It is to be.

The first invention for solving the above-mentioned problems is
Reinforcing bar for insertion and
A cylinder embedded in the first PCa member with one opening exposed from the end face of the first PCa (precast concrete) member and the embedded reinforcing bar in the first PCa member inserted through the other opening. A first-class sleeve having a shape and an elastic member arranged in the first-class sleeve that elastically deforms in response to pressure from the insertion rebar when the insertion rebar is inserted from the one opening. Type 1 sleeve joints with
A tubular second embedded in the second PCa member with one opening exposed from the end face of the second PCa member and the embedded reinforcing bar in the second PCa member inserted through the other opening. Type 2 sleeve fittings with seed sleeves and
Equipped with
The insertion reinforcing bar, the first-class sleeve, and the elastic member are the entire insertion reinforcing bar in a predetermined pushing state in which the insertion reinforcing bar is pushed into the first-class sleeve and the elastic member is contracted. Is housed in the first-class sleeve, and is designed to have a dimensional shape in which a part of the insertion reinforcing bar protrudes from one opening of the first-class sleeve when the pushed state is released.
One opening of the first type sleeve and one opening of the second type sleeve are arranged to face each other, one end side of the insertion reinforcing bar is in the first type sleeve, and the other end side is in the second type sleeve. By grout-filling the inside of the first-class sleeve and the second-class sleeve in the state of being located in, the buried reinforcing bar in the first PCa member and the buried reinforcing bar in the second PCa member. It is a joining structure that joins with.

According to the first invention, a first-class sleeve joint embedded in a first PCa member, a second-class sleeve joint embedded in a second PCa member, and a sleeve of a first-class sleeve joint on one end side (first). The embedded reinforcing bar in the first PCa member and the second reinforcing bar via the insertion reinforcing bar located in the type 1 sleeve) and the other end side located in the sleeve (type 2 sleeve) of the type 2 sleeve joint. Can be joined to the buried reinforcing bar in the PCa member. Specifically, the first-class sleeve joint is embedded in the first PCa member with the embedded reinforcing bar in the first PCa member inserted from the other opening of the first-class sleeve, and the second-class sleeve joint. Is embedded in the second PCa member in a state where the embedded reinforcing bar in the second PCa member is inserted from the other opening of the second type sleeve. Further, when the insertion reinforcing bar is inserted from one opening of the first type sleeve, the elastic member in the first type sleeve is elastically deformed, so that the entire insertion reinforcing bar is housed in the first type sleeve. (Pushed state), and a part (the other end side) protrudes when the pushed state is released. Then, one end side of the insertion reinforcing bar is located in the first type sleeve, while the other end side protruding from the opening is located in the second type sleeve, and the grout is in the first type sleeve and the second type sleeve. Is filled to join the buried reinforcing bars to each other. Therefore, the reinforcing bar can be made to protrude from the PCa member only at the time of joining. In other words, it is possible to provide a new joining structure that can prevent the reinforcing bar from protruding from the PCa member except at the time of joining.

Moreover, as a second invention,
The first-class sleeve joint is
A partition portion that is interposed between the insertion reinforcing bar and the elastic member and is movable in the first-class sleeve as the elastic member is elastically deformed.
Further have,
The joining structure of the first invention may be constructed.

According to the second invention, a partition portion can be interposed between the insertion reinforcing bar and the elastic member. Therefore, when the insertion reinforcing bar is inserted from the opening, the elastic member can be reliably pressed and contracted.

Moreover, as a third invention,
The partition is in the form of a mesh through which grout can pass.
The joining structure of the second invention may be constructed.

According to the third invention, poor filling of grout in the type 1 sleeve can be suppressed.

Moreover, as a fourth invention,
The first-class sleeve is provided with an injection / discharge hole for injecting or discharging grout near the opening on which the buried reinforcing bar in the first PCa member is inserted.
The second type sleeve has
A terminal injection / discharge hole for injecting or discharging grout is provided near the opening on the other side where the buried reinforcing bar in the second PCa member is inserted.
While the other end side of the insertion rebar is inserted, an insertion confirmation hole for visually recognizing the insertion of the insertion rebar is provided near the opening.
The joining structure of any one of the first to third inventions may be constructed.

According to the fourth invention, terminal injection / discharge holes can be provided near the other opening on the side where the embedded reinforcing bars of the first-class sleeve and the second-class sleeve are inserted, respectively, and the terminal injection / discharge holes can be provided in the first-class sleeve and the second. Grout can be injected and discharged into the seed sleeve. Further, an insertion confirmation hole can be provided near one opening on the side where the insertion reinforcing bar of the second type sleeve is inserted. According to this, before filling the grout, the inside of the type 2 sleeve is looked through through the insertion confirmation hole, and the other end side of the insertion reinforcing bar is correctly inserted from one opening and is properly positioned in the type 2 sleeve. It will be possible to confirm whether or not.

Moreover, the fifth invention is
A sleeve joint that joins the insertion rebar to the rebar to be connected.
A tubular sleeve into which one end of the insertion reinforcing bar and one end of the connecting target reinforcing bar are inserted from the openings at both ends.
An elastic member arranged in the center of the sleeve and
With
When the elastic member is elastically deformed, the other end of the insertion reinforcing bar can move forward and backward from the opening.
It is a sleeve joint.

According to the fifth invention, it is possible to realize a sleeve joint in which the joint structure according to the first invention is provided as a first-class sleeve joint.

Moreover, the sixth invention is
Reinforcing bar for insertion and
A cylinder embedded in the first PCa member with one opening exposed from the end face of the first PCa (precast concrete) member and the embedded reinforcing bar in the first PCa member inserted through the other opening. A first-class sleeve having a shape and an elastic member arranged in the first-class sleeve that elastically deforms in response to pressure from the insertion rebar when the insertion rebar is inserted from the one opening. Type 1 sleeve joints with
A tubular second embedded in the second PCa member with one opening exposed from the end face of the second PCa member and the embedded reinforcing bar in the second PCa member inserted through the other opening. Type 2 sleeve fittings with seed sleeves and
Equipped with
The insertion reinforcing bar, the first-class sleeve, and the elastic member are the entire insertion reinforcing bar in a predetermined pushing state in which the insertion reinforcing bar is pushed into the first-class sleeve and the elastic member is contracted. Is housed in the first-class sleeve, and a method for constructing a joint structure designed so that a part of the insertion reinforcing bar protrudes from one opening of the first-class sleeve when the pushed state is released. And
A pushing step in which the insertion reinforcing bar is inserted into the first-class sleeve to bring the entire insertion reinforcing bar into the first-class sleeve and brought into the pushed state.
Temporary PCa member so that the relative positional relationship between the first PCa member and the second PCa member is such that one opening of the first-class sleeve and one opening of the second-class sleeve face each other. Placement steps and
After the PCa member temporary placement step, a release step for releasing the pushed state and a release step.
After the release step, a filling step of grout filling the inside of the first-class sleeve and the second-class sleeve, and
It is a construction method including.

According to the sixth invention, the method for constructing the joint structure according to the first invention can be realized. That is, the insertion reinforcing bar is inserted into the type 1 sleeve to bring it into a pushed state (pushing step), and one opening of the type 1 sleeve and the type 2 sleeve is in a positional relationship facing each other (PCa member temporary placement step). ), Then, after releasing the pushed state (release step), the joint structure can be constructed by filling the grout in the type 1 sleeve and the type 2 sleeve (filling step).

Moreover, as a seventh invention,
The pushing step includes a step of temporarily installing a shield that shields one opening of the first-class sleeve in order to maintain the pushing state.
The release step is a step of releasing the pushed state by removing the shield.
The construction method of the sixth invention may be constructed.

According to the seventh invention, the temporary installation of the shield makes it possible to maintain the pushed state in which the entire insertion reinforcing bar is housed in the type 1 sleeve. Then, after the one openings of the first-class sleeve and the second-class sleeve are in a positional relationship facing each other, the shield can be removed and the pushed state can be released.

The vertical sectional view explaining the structural example of a sleeve joint. Another vertical cross-sectional view illustrating a configuration example of a sleeve joint. The vertical sectional view explaining the structural example of the joint structure. Another vertical cross-sectional view illustrating a configuration example of the joint structure. A flowchart showing the flow of the construction method. The figure explaining the process of the construction method. The figure explaining another process of the construction method. The figure explaining another process of the construction method.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiments described below do not limit the present invention, and the embodiments to which the present invention can be applied are not limited to the following embodiments. Further, in the description of the drawings, the same parts are designated by the same reference numerals.

[About sleeve joints]
First, the sleeve joint of the present embodiment will be described. The sleeve joint of the present embodiment is for joining the insertion reinforcing bar with the reinforcing bar to be connected (rebar to be connected), and is used as a type 1 sleeve joint in the joining structure described later, for example. 1 and 2 are views for explaining a configuration example of the sleeve joint 10, and are vertical cross-sectional views showing an internal structure by cutting out the sleeve 11. FIG. 2 shows the sleeve joint 10 in the pushed state, which will be described later, and FIG. 1 shows the sleeve joint 10 in the pushed state when it is released (hereinafter, also referred to as “released state”). Further, the configuration diagrams shown in FIGS. 1 to 4 and 6 to 8 are schematic views for facilitating understanding. For example, dimensions such as the length of the sleeve 11 and the length of the reinforcing bar inserted into the sleeve 11 are appropriately designed based on the contents described in the present specification.

As shown in FIG. 1 and the like, the sleeve joint (type 1 sleeve joint) 10 has one end (insertion side: right end side toward FIG. 1) of the insertion reinforcing bar 5 from one end opening (one opening) 111. ) Is inserted, and one end (insertion side: left end side toward FIG. 1) of the reinforcing bar 6 to be connected is inserted from the opening (the other opening) 113 at the other end. 11 and a spring member 13 as an elastic member arranged at a central portion in the sleeve 11. Then, the spring member 13 is elastically deformed so that the other end of the insertion reinforcing bar 5 (opposite side of insertion: left end side toward FIG. 1) can be moved forward and backward from one opening 111.

On the other hand, the sleeve 11 is provided with a terminal injection / discharge hole 115 for injecting or discharging grout such as mortar near the opening 113.

Further, the sleeve joint 10 has a first partition portion 15 that forms an insertion portion 191 of the reinforcing bar 6 to be connected on the other end side (right end side toward FIG. 1) of the sleeve 11 and one end side of the sleeve 11 (FIG. 1). A second partition portion 17 for forming an insertion portion 193 of the insertion reinforcing bar 5 is provided on the left end side toward the side), and a spring member 13 is provided between the first partition portion 15 and the second partition portion 17. Be placed. The first partition portion 15 is fixed to the inner wall of the sleeve 11 to partition the internal space of the sleeve 11 and forms the insertion portion 191. On the other hand, the second partition portion 17 forms the insertion portion 193 by interposing between the insertion reinforcing bar 5 and the spring member 13, and in the axial direction of the sleeve 11 due to the elastic deformation of the spring member 13. Moving. The first partition portion 15 and the second partition portion 17 have a mesh shape through which grout can pass. For example, the overall shape can be realized by a wire mesh having a shape (for example, a disk shape) that follows the shape inside the cross section of the sleeve 11.

Then, as shown in FIG. 2, the dimensional shape of each part of the sleeve joint 10 and the insertion reinforcing bar 5 joined to the connection target reinforcing bar 6 by the sleeve joint 10 is such that the insertion reinforcing bar 5 is pushed into the sleeve 11. While the entire insertion reinforcing bar 5 is housed in the sleeve 11 in a predetermined pushing state in which the spring member 13 is contracted, as shown in FIG. 1, the insertion reinforcing bar is in the released state when the pushed state is released. A part of 5 is designed to have a dimensional shape protruding from one opening 111 of the sleeve 11. Further, the depth L11 of the insertion portion 191 (fixed position of the first partition portion 15) and the depth L13 of the insertion portion 193 in the released state take into consideration the effective length of the reinforcing bar (for example, the fixing length) in the sleeve 11. Is regulated. In addition, the protruding length L15 from one opening 111 of the insertion reinforcing bar 5 in the released state is the effective length (for example, fixing) of the reinforcing bar in the sleeve into which it is inserted (for example, the second type sleeve 31 of FIG. 3 or the like). It is stipulated based on (Chief).

The first partition portion 15 does not necessarily have to be fixed to the inner wall of the sleeve 11, and similarly to the second partition portion 17, the first partition portion 15 may be interposed between the connecting target reinforcing bar 6 and the spring member 13. Good. Further, the first partition portion 15 and the second partition portion 17 may be fixed to the end portion of the spring member 13, respectively.

[About the joint structure]
Next, the joining structure of the present embodiment will be described. 3 and 4 are vertical cross-sectional views for explaining a configuration example of the joint structure 1, and FIG. 3 shows an internal structure before the grout is filled in the type 1 sleeve 11 and the type 2 sleeve 31. FIG. 4 shows a state in which the inside of the first-class sleeve 11 and the second-class sleeve 31 are filled with grout. As shown in FIG. 3 and the like, the joining structure 1 of the present embodiment includes a reinforcing bar 5 for insertion, a first-class sleeve joint 10, and a second-class sleeve joint 30. In addition, in FIG. 3 and the like, two first-class sleeve joints 10 embedded vertically in the first PCa member 71 and two second-class sleeve joints 30 embedded vertically in the second PCa member 73. However, the number and arrangement thereof are not particularly limited.

As described with reference to FIG. 1 and the like, the first-class sleeve joint 10 has a first-class sleeve 11 and a spring member 13, and connects the buried reinforcing bars 61 embedded in the first PCa member 71. As the target reinforcing bar, the insertion reinforcing bar 5 is joined to the buried reinforcing bar 61. More specifically, as shown in FIG. 3 and the like, the first-class sleeve 11 has a tubular shape. Then, in the first-class sleeve 11, one opening 111 is exposed from the end surface 711 of the first PCa member 71, and the buried reinforcing bar 61 in the first PCa member 71 is inserted from the other opening 113. It is embedded in the first PCa member 71. Further, the spring member 13 is arranged in the type 1 sleeve 11, while when the insertion reinforcing bar 5 is inserted through the opening 111, the spring member 13 is elastically deformed in response to the pressing by the insertion reinforcing bar 5. The terminal injection / discharge hole 115 provided in the first-class sleeve 11 communicates with the outside through the communication port 713 provided in the first PCa member 71.

On the other hand, the second-class sleeve joint 30 is for joining the insertion reinforcing bar 5 with the buried reinforcing bar 63 embedded in the second PCa member 73, and has a tubular second-class sleeve 31. Then, in the second type sleeve 31, one opening 311 is exposed from the end surface 731 of the second PCa member 73, and the buried reinforcing bar 63 in the second PCa member 73 is inserted from the other opening 313. It is embedded in the second PCa member 73. The second-class sleeve 31 is provided with a terminal injection / discharge hole 315 for injecting or discharging grout near the opening 313, and for visually recognizing the insertion of the insertion reinforcing bar 5 near the opening 311. An insertion confirmation hole 317 is provided. Then, the terminal injection / discharge hole 315 communicates with the outside through the communication port 733 provided in the second PCa member 73, and the insertion confirmation hole 317 is similarly provided in the second PCa member 73. It communicates with the outside via 735.

The insertion confirmation hole 317 has other ends when the insertion reinforcing bar 5 is properly positioned in the type 2 sleeve 31 (when the insertion length into the type 2 sleeve 31 is longer than the effective length of the reinforcing bar). On the other hand, the depth L2 from the opening 311 is defined based on the effective length of the reinforcing bar so that it can be visually recognized. Therefore, if the insertion reinforcing bar 5 is correctly inserted, the other end of the insertion reinforcing bar 5 can be visually recognized from the insertion confirmation hole 317.

Then, the joint structure 1 is formed by the embedded reinforcing bars 61 and the second PCa in the first PCa member 71 via the sleeve joints 10 and 30 and the insertion reinforcing bars 5 inserted into the sleeves 11 and 31. The buried reinforcing bar 63 in the member 73 is joined. Specifically, as shown in FIG. 3, one opening 111 of the first-class sleeve 11 and one opening 311 of the corresponding second-class sleeve 31 are arranged to face each other. Then, as shown in FIG. 4, in a state where one end side of the insertion reinforcing bar 5 is located in the first-class sleeve 11 and the other end side is located in the second-class sleeve 31, the first-class sleeve 11 and the first By filling the inside of the Type 2 sleeve 31 with grout, the buried reinforcing bars 61 and 63 are joined to each other.

For filling the grout 8, for example, the terminal injection / discharge hole 315 of the type 2 sleeve 31 is used as an injection port, and the grout is injected into the type 2 sleeve 31 from the communication port 733 through the terminal injection / discharge hole 315. Do it by. In that case, the terminal injection / discharging hole 115 of the first-class sleeve 11 serves as a discharge port for discharging the air extruded from the inside of the first-class sleeve 11 and the second-class sleeve 31 by the injection of the grout 8. Then, on the other hand, the grout 8 that has reached the inside of the first-class sleeve 11 through the openings 311, 111 passes through the mesh of the second partition 17 and the first partition 15, and the first-class sleeve 11 It will reach the other end side. According to this, the grout 8 can be spread over the entire area in the type 1 sleeve 11 and the type 2 sleeve 31. Completion of filling of the grout 8 can be confirmed by the fact that the grout 8 is discharged from the terminal injection / discharging hole 115. The terminal injection / discharge hole 115 of the type 1 sleeve 11 may be used as an injection port, and the terminal injection / discharge hole 315 of the type 2 sleeve 31 may be used as an discharge port. In either case, when injecting grout, in order to prevent grout filling failure due to discharge of grout from the insertion confirmation hole 317, a cap member is inserted into the communication port 735 from the outside to close the communication port 735 to the insertion confirmation hole 317. It is good to do so. Further, the insertion confirmation hole 317 may be used as an auxiliary terminal injection / discharge hole and may be used as an auxiliary port for the grout 8 as an injection port or a discharge port.

[How to build]
Next, a method of constructing the joint structure 1 will be described. FIG. 5 is a flowchart showing the flow of the construction method. 6 to 8 are diagrams for explaining the steps of the construction method, FIG. 6 is an explanatory diagram of a pushing step, FIG. 7 is an explanatory diagram of a PCa member temporary placement step, and FIG. 8 is an explanatory diagram of a releasing step. More specifically, FIGS. 6 to 8 show each step in the construction of the rigid frame viaduct with the first PCa member as the PCa beam member 71a and the second PCa member as the PCa column member 73a. Note that FIGS. 6 to 8 are application examples, and the applicable PCa members are not limited to this.

As shown in FIG. 5, in the construction method of the present embodiment, first, a pushing step is performed (step S1). In this pushing step, the insertion reinforcing bar 5 is pushed into the first-class sleeve 11 so that the entire insertion reinforcing bar 5 is housed in the first-class sleeve 11.

In the present embodiment, first, in order to maintain the pushed state, as shown in FIG. 6, a shielding plate 9 as a shielding material for shielding one opening 111 of the first-class sleeve 11 is temporarily installed. The shielding plate 9 has, for example, a length in the vertical direction equal to the height of the PCa column member 73a, and an end surface of the PCa beam member 71a and the PCa column member 73a whose lateral lengths are butted at the time of joining. The length is about the same as the width of 711a and 731a (hereinafter, also referred to as "target end face"). The temporary shielding plate 9 is erected in parallel with the target end surface 731a of the PCa pillar member 73a, and one plate surface is brought into contact with the target end surface 731a.

After that, as shown by an arrow A3 in FIG. 6, the target end surface 711a of the PCa beam member 71a is pressed against the other plate surface of the shielding plate 9. As a result, the other end side of the insertion reinforcing bar 5 protruding from the target end surface 711a is pushed into the type 1 sleeve 11 and accommodated, and the pushed state is established. When a plurality of first-class sleeves 11 are embedded in the PCa beam member 71a (two embedded in the upper and lower parts are shown in FIG. 6), a plurality of insertion reinforcing bars 5 protruding from the target end face 711a are provided. It can be pushed together.

Subsequently, as shown in FIG. 5, a PCa member temporary placement step is performed (step S2). In this PCa member temporary placement step, first, as shown in FIG. 7, a jack or the like is used while maintaining the pushed state by aligning the target end surface 711a of the PCa beam member 71a with the plate surface of the shielding plate 9. The PCa beam member 71a is raised.

Then, the relative positional relationship between the PCa beam member 71a and the PCa pillar member 73a is tentatively set so that the one opening 111 of the corresponding first-class sleeve 11 and the one opening 311 of the second-class sleeve 31 face each other. Place it. Specifically, as shown by a broken line in FIG. 7, one opening 111,311 of each of the upper sleeves 11 and 31 and one opening 111,311 of each of the lower sleeves 11 and 31 shield each other, respectively. Temporary placement is performed by raising the PCa beam member 71a to a height at which the plate 9 is sandwiched and facing each other. According to this, the shielding plate 9 for maintaining the pushed state serves as a guide, and the PCa beam member 71a can be raised to a target height.

Subsequently, as shown in FIG. 5, a release step is performed (step S3). In this release step, as shown in FIG. 8, the pressed state is released by removing the shielding plate 9 between the PCa beam member 71a and the PCa column member 73a.

Here, in step S2 of the previous stage, the corresponding one-sided openings 111 and 311 are in a positional relationship facing each other. Therefore, when the shielding plate 9 is removed, the spring member 13 is extended to release the pushed state, and as a result, the other end side of the insertion reinforcing bar 5 protruding from the opening 111 is released from the corresponding opening 311. It is inserted into the second type sleeve 31.

According to the above-mentioned temporary placement step and release step of the PCa member, the PCa beam member 71a and the PCa column member 73a correspond to each other while maintaining the pushed state in which the insertion reinforcing bar 5 is housed in the type 1 sleeve 11. The openings 111 and 311 can be arranged so as to face each other. Then, the pushed state can be released on that, and the other end side of the insertion reinforcing bar 5 can be inserted into the first-class sleeve 11. Therefore, it is possible to prevent an error of inserting the insertion reinforcing bar 5 into the one opening 311 different from the one opening 311 of the second type sleeve 31 to be inserted, and to correspond to the other end side of the insertion reinforcing bar 5. It can be securely inserted into the second-class sleeve 31.

Subsequently, as shown in FIG. 5, a confirmation step is performed (step S4). In this confirmation step, when the operator looks into the inside of the type 2 sleeve 31 from the insertion confirmation hole 317 shown in FIG. 3, the insertion reinforcing bar 5 is inserted through the opening 311 and inside the type 2 sleeve 31. It is confirmed whether or not the reinforcing bar is properly positioned, that is, whether or not the effective length of the reinforcing bar is surely inserted into the type 2 sleeve 31. If the other end of the insertion reinforcing bar 5 can be seen from the insertion confirmation hole 317, it can be determined that the position is properly positioned.

Subsequently, a filling step of grout filling the inside of the first-class sleeve 11 and the second-class sleeve 31 is performed to join the buried reinforcing bar 61a in the PCa beam member 71a and the buried reinforcing bar 63a in the PCa column member 73a ( Step S5). For example, as described with reference to FIGS. 3 and 4, grout is injected through the terminal injection / discharge hole 315 of the type 2 sleeve 31. Then, when the discharge of the grout from the terminal injection / discharge hole 115 of the first-class sleeve 11 is confirmed, the injection is completed.

As described above, according to the present embodiment, the reinforcing bar can be made to protrude from the PCa member only at the time of joining. In other words, it is possible to provide a new joining structure that can prevent the reinforcing bar from protruding from the PCa member except at the time of joining.

Further, by applying it to the construction of the ramen viaduct described with reference to FIGS. 6 to 8, it is possible to reduce the construction cost and the construction space. That is, conventionally, the reinforcing bar protrudes from one PCa beam member to be joined, and it is necessary to insert this into the sleeve embedded in the other PCa column member. Therefore, the PCa beam member is lifted and protruded by a large crane. It was a large-scale erection work that required a large work space to insert the reinforcing bar into the corresponding sleeve. On the other hand, according to the construction method of the present embodiment, the erection can be performed by jacking up. In addition, according to this method, it is possible to erection without support. Therefore, it is not necessary to use a large crane or the like, and the division of labor cost and the construction space can be reduced.

1 ... Joint structure 10 ... Type 1 sleeve joint (sleeve joint)
11 ... Type 1 sleeve (sleeve)
111 ... One opening 113 ... The other opening 115 ... Terminal injection / discharge hole 13 ... Spring member 15 ... First partition 17 ... Second partition 30 ... Type 2 sleeve joint 31 ... Type 2 sleeve 315 ... End Injection / discharge hole 317 ... Insertion confirmation hole 5 ... Reinforcing bar for insertion 6 ... Reinforcing bar to be connected 61, 63, 61a, 63a ... Buried reinforcing bar 71 ... First PCa member 71a ... PCa beam member 713 ... Communication port 73 ... Second PCa member 73a ... PCa pillar member 733,735 ... Communication port 8 ... Grout 9 ... Shielding plate

Claims (7)

Reinforcing bar for insertion and
A cylinder embedded in the first PCa member with one opening exposed from the end face of the first PCa (precast concrete) member and the embedded reinforcing bar in the first PCa member inserted through the other opening. A first-class sleeve having a shape and an elastic member arranged in the first-class sleeve that elastically deforms in response to pressure from the insertion rebar when the insertion rebar is inserted from the one opening. Type 1 sleeve joints with
A tubular second embedded in the second PCa member with one opening exposed from the end face of the second PCa member and the embedded reinforcing bar in the second PCa member inserted through the other opening. Type 2 sleeve fittings with seed sleeves and
Equipped with
The insertion reinforcing bar, the first-class sleeve, and the elastic member are the entire insertion reinforcing bar in a predetermined pushing state in which the insertion reinforcing bar is pushed into the first-class sleeve and the elastic member is contracted. Is housed in the first-class sleeve, and is designed to have a dimensional shape in which a part of the insertion reinforcing bar protrudes from one opening of the first-class sleeve when the pushed state is released.
One opening of the first type sleeve and one opening of the second type sleeve are arranged to face each other, one end side of the insertion reinforcing bar is in the first type sleeve, and the other end side is in the second type sleeve. By grout-filling the inside of the first-class sleeve and the second-class sleeve in the state of being located in, the buried reinforcing bar in the first PCa member and the buried reinforcing bar in the second PCa member. Joining structure to join with. The first-class sleeve joint is
A partition portion that is interposed between the insertion reinforcing bar and the elastic member and is movable in the first-class sleeve as the elastic member is elastically deformed.
Further have,
The joining structure according to claim 1. The partition is in the form of a mesh through which grout can pass.
The joining structure according to claim 2. The first-class sleeve is provided with an injection / discharge hole for injecting or discharging grout near the opening on which the buried reinforcing bar in the first PCa member is inserted.
The second type sleeve has
A terminal injection / discharge hole for injecting or discharging grout is provided near the opening on the other side where the buried reinforcing bar in the second PCa member is inserted.
While the other end side of the insertion rebar is inserted, an insertion confirmation hole for visually recognizing the insertion of the insertion rebar is provided near the opening.
The joining structure according to any one of claims 1 to 3. A sleeve joint that joins the insertion rebar to the rebar to be connected.
A tubular sleeve into which one end of the insertion reinforcing bar and one end of the connecting target reinforcing bar are inserted from the openings at both ends.
An elastic member arranged in the center of the sleeve and
With
When the elastic member is elastically deformed, the other end of the insertion reinforcing bar can move forward and backward from the opening.
Sleeve fitting. Reinforcing bar for insertion and
A cylinder embedded in the first PCa member with one opening exposed from the end face of the first PCa (precast concrete) member and the embedded reinforcing bar in the first PCa member inserted through the other opening. A first-class sleeve having a shape and an elastic member arranged in the first-class sleeve that elastically deforms in response to pressure from the insertion rebar when the insertion rebar is inserted from the one opening. Type 1 sleeve joints with
A tubular second embedded in the second PCa member with one opening exposed from the end face of the second PCa member and the embedded reinforcing bar in the second PCa member inserted through the other opening. Type 2 sleeve fittings with seed sleeves and
Equipped with
The insertion reinforcing bar, the first-class sleeve, and the elastic member are the entire insertion reinforcing bar in a predetermined pushing state in which the insertion reinforcing bar is pushed into the first-class sleeve and the elastic member is contracted. Is housed in the first-class sleeve, and a method for constructing a joint structure designed so that a part of the insertion reinforcing bar protrudes from one opening of the first-class sleeve when the pushed state is released. And
A pushing step in which the insertion reinforcing bar is inserted into the first-class sleeve to bring the entire insertion reinforcing bar into the first-class sleeve and brought into the pushed state.
Temporary PCa member so that the relative positional relationship between the first PCa member and the second PCa member is such that one opening of the first-class sleeve and one opening of the second-class sleeve face each other. Placement steps and
After the PCa member temporary placement step, a release step for releasing the pushed state and a release step.
After the release step, a filling step of grout filling the inside of the first-class sleeve and the second-class sleeve, and
Construction method including. The pushing step includes a step of temporarily installing a shield that shields one opening of the first-class sleeve in order to maintain the pushing state.
The release step is a step of releasing the pushed state by removing the shield.
The construction method according to claim 6.

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