JP5604265B2 - Precast member connection structure - Google Patents

Description

  The present invention relates to a connection structure for precast members, and specifically relates to a technique that enables connection between precast members with a lightweight and low-cost metal fitting.

  When a tunnel is constructed by adopting the shield method, it is common to connect segments at the rear to form a cylindrical lining body according to the excavation of the face. In order to simplify the connection work between the segments and enable automatic work by a robot such as an erector, a connection structure using C-type and I-type connection fittings has been proposed. In this connection structure, a C-type connection fitting is embedded in a position opposite to the butt joint surface of the segment, and the I-type connection is engaged with the flanges at both ends at the openings of the C-type connection fittings of both opposing segments. By fitting the metal fittings, the abutting end surfaces of the segments are joined and connected to each other.

  As an example of such a technique, for example, the box-shaped steel segments that are assembled and formed into a lining body by butting the side end faces are joined to each other with a joint fitting formed in an I shape. The side plate forming the end surface is formed with an insertion port for inserting the flange portion of the connecting metal piece, and a web insertion groove for the connecting metal member that extends in the longitudinal direction of the side plate and communicates with the insertion port. The connecting structure of the segments that are connected by connecting the connecting hardware straddling between the grooves, wherein the connecting hardware is inserted in advance into the web insertion groove of one segment that is butt-joined to each other. A flange portion at one end of the connecting hardware is integrally fixed to the inner surface of the side plate, and the flange at the other end is protruded laterally, and is fixedly locked to the flange at the other end. Let the flange on the other end side Between the engagement portion of the side plate of the square of the segment, such as the coupling structure of the segment, characterized in that the elastic member for crimping the joining end faces butt of both segments is interposed (Patent Document 1) has been proposed.

JP 2006-52541 A

  In the existing connection structure, the pulling force generated between the segments is directly received by the C-type hardware via the I-type hardware. Further, with respect to the pulling force that the C-shaped metal piece takes on, the anchor bars extending rearward (inside the segment) from the C-shaped metal piece are opposed to exert their pulling-out strength.

  With such a connection structure, it is necessary to increase the strength of the C-shaped hardware itself and to resist the pulling force. For this reason, the C-type hardware adopted in the conventional connection structure is thick and heavy. Further, since the C-type metal piece needs to have a complicated shape necessary for connection with the I-type metal piece, it cannot be formed by a simple press working or the like of a metal plate, and is manufactured by casting. Therefore, the manufacturing cost is increased along with the weight, and the introduction cost of the C-type metal fitting and the connecting structure is increased.

  Therefore, an object of the present invention is to provide a technique that enables connection between precast members with a lightweight and low-cost metal fitting.

In the precast member connection structure of the present invention that solves the above problems, a cylindrical connection metal fitting having a slit-like opening in the longitudinal direction is embedded in the inner part of a predetermined length from the contact surface with the other member in the precast member to be connected. One end of an I-shaped connecting hardware composed of a flange at the end and a web of a predetermined length connected to the flange is held by the other member, and the other end is provided in the abutment surface of the precast member; It is inserted toward the cylindrical connecting hardware through a predetermined inner space in the precast member continuous thereto, and the flange is fitted into the inner space of the cylindrical connecting hardware, and the cylindrical shape in the precast member The pulling force generated between the cylindrical connecting metal and the I-shaped metal in the precast member and the other member that are in contact with each other with respect to the embedment depth of the connecting metal is the contact surface. Characterized in that it is a buried depth when pulling strength in accordance with the buried depth of the tubular connecting hardware of above.

  According to this, a cylindrical connecting hardware such as a so-called C-shaped metal fitting is used by being arranged at a predetermined depth inside the precast member, that is, inside the precast member instead of the contact surface of the precast member. . In this way, the cylindrical connecting hardware arranged in the inner part instead of the abutting surface obtains a reaction force on the surrounding concrete to which it is fixed against the pulling force transmitted through the I-type connecting hardware. Demonstrate pulling strength (cone strength, punching shear strength). That is, unlike the conventional C-shaped metal fittings, the C-shaped metal hardware itself does not accept the pulling force, so that it is not necessary to adopt a thick cast iron thing as the cylindrical coupling hardware. Further, there is no need to arrange anchor bars as in the conventional C-shaped hardware, the connection structure is simple, and the cost can be further reduced. Therefore, the connection between the precast members can be achieved by a lightweight and low-cost metal fitting.

  In addition, in the connection structure of the said precast member, it is suitable if the said cylindrical connection metal fitting is comprised with the plate-shaped material. As mentioned above, it is not necessary to use a thick cast iron as the cylindrical connection hardware, so it is possible to use a cylindrical connection hardware manufactured by processing a thin plate material for the connection structure. Thus, it is possible to achieve a significant weight reduction compared to the case of using a conventional C-shaped hardware made of cast iron with a large thickness. Further, by adopting a cylindrical connecting hardware manufactured only by inexpensive plate material processing instead of costly casting, the cost can be reduced as a matter of course. The plate-like material constituting such a cylindrical connecting metal has a defect in the concrete of the precast member on the back of the plate-like material, even if the corners of the flange in the I-type connecting metal come into contact with each other and pulling stress is applied. Any material having an appropriate strength that does not occur may be used. For example, it may be made of metal, resin, or carbon fiber. Or you may apply | coat the liquid substance or gel-like thing of such a raw material to the concrete wall surface in the precast member provided so that it may become the same shape as a cylindrical connection metal fitting.

  Further, in the connection structure of the precast member, the predetermined inner space in the precast member continuous to the insertion port is a bag portion that is a box-shaped region having a predetermined depth extending inward from the insertion port of the contact surface, The contact surface is continuous with the insertion port, extends a predetermined length in the longitudinal direction of the contact surface, extends through the web in the depth direction of the bag portion, and extends from the bag portion. And a connecting portion having a web path extending a predetermined depth in the precast member from the insertion opening to the installation location of the cylindrical connecting hardware. This is preferable.

  According to this, the procedure of inserting the flange of the I-type connecting hardware and a part of the web into the bag part through the insertion port in the precast member to be connected, the flange and the part of the web leading to the bag part, A step of guiding the web path through the insertion opening and the side opening of the connecting portion and sliding the web path in the longitudinal direction of the abutment surface; the sliding causes the flange to reach a predetermined depth in the precast member; It is possible to smoothly perform the procedure of fitting into the inner space of the connection hardware as a series.

  Moreover, in the connection structure of the precast member, it is preferable that the flange and the inner space of the cylindrical connection fitting to which the flange is fitted have a wedge shape, and the both are wedge-coupled. According to this, for example, the flange of the I-shaped coupling hardware slides in the longitudinal direction of the abutment surface in the web path, and the fitting becomes tight as it advances through the inner space of the cylindrical coupling hardware. The connection structure becomes stronger.

  Moreover, in the connection structure of the precast member, a flange at one end of the I-type connection hardware includes a tube body in which a rod body is fitted in advance, and an end portion of the rod body is installed on another member. The flange is fitted into the inner space of the cylindrical connecting metal in the other member so as to protrude from the predetermined opening provided in the cylindrical connecting metal, and the end of the rod body protruding from the predetermined opening is connected to the cylinder in the other member. By attaching and fixing to the concrete cast around the metal connection hardware, one end of the I-type connection hardware is fixed in advance to the other member, and the flange at the other end of the I-type connection hardware is precast to be connected The tube is fitted into the inner space of the cylindrical connecting hardware, and a reaction force is obtained from the fitting operation, so that the tube and the rod previously fitted in the flange at the one end are fitted more deeply. Let me It may be.

  According to this, the rod body and the pipe body, which are embedded and fixed in the surrounding concrete, are fitted, and for example, when the I-type coupling hardware is rattled by the above-mentioned wedge coupling fitting However, such rattling is suppressed by the fitting of the tube body and the rod body, and one end of the I-type coupling hardware is more reliably fixed to the other member. In addition, a reaction force is obtained in the fitting operation between the I-shaped coupling hardware and the cylindrical coupling hardware in the precast member, so that the rod body is fitted more deeply into the tubular body at the flange at the one end. One end of the hardware is more reliably fixed to the other member.

  Moreover, in the connection structure of the precast member, one end of the I-type connection hardware may be embedded and fixed to the other member. As such a structure, for example, a concrete structure in which one end of the I-type metal fitting is placed and fixed in the cast concrete as it is when placing concrete constituting another member can be assumed. In such a case, the cylindrical connecting hardware on the other member side, the above-described insertion port, bag portion, and the like can be omitted, and reduction in construction efficiency and cost is expected.

Further, in the connection structure of the precast member described above, the reinforcing bar is arranged in a cone breaking region between the contact surface of the precast member and the cylindrical connection hardware embedded in a predetermined length from the contact surface. It may be a made structure. According to this, with respect to cone breakage due to the pulling force generated between the cylindrical connecting hardware and the I-shaped hardware, reinforcement reinforcement with solidified material (concrete) corresponding to the cone breaking area above the cylindrical connecting hardware This effectively resists, and as a result, the pulling strength according to the above-described embedding depth is effectively improved, which is preferable.

It is a figure which shows the connection structure of the precast member in this embodiment. It is a figure which shows the embedment condition of the cylindrical connection metal fitting (C-type metal fitting) in this embodiment. It is a conceptual diagram of the drawing strength design with respect to cone destruction in this embodiment. It is a figure which shows the connection procedure of the precast member in this embodiment. It is a figure which shows the connection structure of the precast member in other embodiment. It is a figure which shows the connection procedure of the precast member in other embodiment.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram illustrating a connection structure of precast members in the present embodiment, and FIG. 2 is a diagram illustrating a state in which a cylindrical connection hardware (C-shaped hardware) is embedded in the present embodiment. As a precast member in the present embodiment, a segment 10 used as a tunnel lining body in the shield method will be exemplified. In the shield construction method, in the shield machine, it is general that the segments 10 are sequentially connected by an erector or the like to form a cylindrical covering body. Therefore, the connection structure 100 of the present embodiment is employed as the connection structure of the segments 10 that are connected to each other.

  The connection structure 100 includes a cylindrical connection hardware 20 and an I-type connection hardware 30 as shown in FIG. The cylindrical connecting hardware 20 is a hardware similar to a so-called C-shaped hardware, and is a connecting hardware including a slit-like opening 21 in the longitudinal direction. On the other hand, an I-type connecting hardware 30 is composed of an end flange 31 and a web 32 of a predetermined length connected to the flange 31. Here, “I type” is described, but the H type is also included in the concept. The length of the web 32 of the I-shaped coupling hardware 30 corresponds to the cylindrical coupling hardware 20 being buried within a predetermined depth from the contact surface 11 of the segment 10, and the embedded depth of the cylindrical coupling hardware 20. It is about twice that.

  In the connection structure 100 of the present embodiment, the cylindrical connection hardware 20 is embedded inward by a predetermined length 5 from the contact surface 11 with the other segment 15 in the segment 10 to be connected. The conventional connection structure is greatly different from the configuration in which the opening 21 is exposed as it is on the contact surface 11, that is, the cylindrical connection hardware 20 is embedded in the almost surface of the segment 10. In this way, the cylindrical connecting hardware 20 arranged not directly under the contact surface 11 but in the back of the segment is the surrounding concrete to which it is fixed against the pulling force transmitted through the I-type connecting hardware 30. The pulling strength (cone strength, punching shear strength) is exhibited by obtaining a reaction force. Moreover, it is not necessary to arrange an anchor line behind as in the prior art.

  The opening 21 in the above-described cylindrical connecting hardware 20 is provided via an insertion opening 40 on the contact surface 11 that is an opening having a diameter equal to or larger than the diameter of the web 32 of the I-shaped connecting hardware 30 and a web path 41 that is a groove-shaped space. Are tied together. Therefore, it can be said that the cylindrical connecting hardware 20 is opened at the contact surface 11 with the insertion opening 40.

  On the other hand, the web path 41 is a path extending a predetermined depth in the segment from the insertion opening 40 to the installation location of the cylindrical connecting hardware 20. The insertion opening 40 is an opening that extends a predetermined length in the longitudinal direction of the abutting surface 11, and has substantially the same length as the length 33 of the flange 31 of the I-type connecting hardware 30. Further, the side surface of the web path 41 is provided with a side opening 42 that extends inwardly and through which the I-type coupling hardware 30 can pass. The inner space of the segment having the insertion opening 40, the side opening 42, and the web path 41 becomes the connecting portion 43.

  Another structure included in the connection structure 100 includes a bag portion 45 that is a box-shaped region having a predetermined depth extending inward from the insertion port 44 of the contact surface 11. The insertion opening 44 of the bag portion 45 is an opening continuous with the insertion opening 40 described above. In the example shown in FIG. 1, the insertion opening 44 and the insertion opening 40 smaller than the insertion opening 44 are connected to each other. Yes.

  On the other hand, the I-type metal fitting 30 has one end held by the other member 15 and the other end cylindrical through an insertion port 44 provided in the contact surface 11 of the segment 10 and a predetermined inner space in the segment continuous thereto. It will be inserted toward the connecting hardware 20. The predetermined inner space in the segment continuous to the insertion port 44 refers to the connecting portion 43 and the bag portion 45 described above. In this case, the flange 31 of the I-type connection hardware 30 is inserted into the bag portion 45 via the insertion port 44 and slides along the web path 41 of the connection portion 43 via the side opening 42 on the side surface of the bag portion 45. Be made. Similarly, the web 32 slides along the web path 41.

  At this time, the flange 31 of the I-shaped connecting hardware 30 faces the inner surface 22 of the cylindrical connecting hardware 20 at the bottom of the web path 41, that is, the bottom of the connecting portion 43, toward the abutting surface 24 opposite to the side opening 42. And finally mates with the inner space 22.

  FIG. 1 shows an example in which the one end of the I-type connecting hardware 30 is inserted into the inner space 22 of the cylindrical connecting hardware 20 provided in the inner part of the other member 15 and is fitted and held therein. ing. However, the form in which one end of the I-type connection hardware 30 is held by the other member 15 is not limited to this. For example, in accordance with the formation of the other member 15 (for example, concrete placement for segment formation), one end of the I-type connecting hardware 30 is locked to the inner back of the other member 15 via a predetermined jig or the like. In addition, it is also possible to adopt a form in which the other member 15 is embedded and fixed (in the case of placing concrete constituting the other member 15, an example in which one end of the I-type connecting hardware 30 is arranged and fixed in the placed concrete as it is, etc. Including). In that case, the cylindrical connecting hardware 20, the inner space 22, the insertion port 44, and the bag portion 45 on the other member 15 side can be omitted.

  Further, as a structure suitable for the above-described fitting, a structure in which wedge coupling is performed can be given. In the connection structure 100 shown in the present embodiment, a structure in which the wedge connection is performed when the flange 31 and the inner space 22 are fitted is employed. For this reason, the cylindrical connecting hardware 20 is inclined so that the inner space 22 gradually descends in the inner direction of the segment. Further, the flange 31 is shaped so as to gradually rise in the direction of inclination opposite to the inclination of the inner space 22, that is, from the inner part of the segment toward the contact surface. Therefore, each time the flange 31 of the I-type connection hardware 30 that slides from the side opening 42 to the connection portion 43 enters the inner space 22, the corner portion 34 becomes the corner portion 23 of the cylindrical connection hardware 20. And will fit closely together.

  In addition, in each of the I-type coupling hardware 30 and the cylindrical coupling hardware 20, an adhesive is applied to the contact surfaces of the both, and the I-type coupling hardware 30 and the cylindrical coupling hardware 20 are firmly bonded during fitting. It is good. Alternatively, in accordance with the fitting, the inner space 22 of the cylindrical connecting hardware 20 is filled with, for example, putty (for example, epoxy putty, polyester putty, etc.) or a gel-like adhesive, and the cylindrical connecting hardware is used for the fitting. The I-type coupling hardware 30 that has entered the inner space 22 of the 20 may be integrated with the inner space 22 via a putty or the like, and the fitting may be firmly fixed.

  In addition, the above-described cylindrical connecting hardware 20 does not almost take on the pulling force by itself unlike the conventional C-shaped hardware. Therefore, it is not necessary to adopt a thick cast iron, and it is sufficient to employ a plate-shaped material. The plate-like material constituting the cylindrical connecting metal 20 is the concrete of the segment 10 on the back surface of the plate-like material even if the corner portion 34 of the flange 31 in the I-type connecting metal 30 abuts and a pulling stress is applied. As long as it has an appropriate strength that does not cause defects or the like. For example, it may be made of metal, resin, or carbon fiber. Alternatively, a liquid material or a gel material of such a material may be applied to the concrete wall in the segment provided so as to have the same shape as the cylindrical connecting hardware 20.

In addition, the calculation example in the case of designing the drawing strength with respect to cone destruction is shown below about the connection structure 100 of this embodiment which embeds the cylindrical connection metal fitting 20 in the inner part of a segment. FIG. 3 is a conceptual diagram of a drawing strength design against cone fracture in the present embodiment. In this case, the pulling strength Pa is
Pa = α × Pa1 = α × {φ1 · √ (f'ck × 10.2) · Ac / 100 × 9.8} / 1000
It can be expressed by the following formula.

Where each coefficient is
・ Ac = 2 ・ (a + b + 2 ・ ld) ・ ld ・ ・ ・ ・ Resistance area ・ φ1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Coefficient for cone destruction ・ ld ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ Effective depth ・ f'ck ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Concrete compressive strength ・ a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ I type connection Length of hardware · b ··············· Width of I-type connected hardware ······························ is the rate of increase in shear strength by steel fibers

So, if you put in the values that can be assumed for each coefficient,
・ Resistance area Ac = 2 ・ (a + b + 2 ・ ld) ・ ld = 60800mm2
・ Coefficient for cone destruction φ1 = 1
・ Effective depth ld = 100mm
・ Concrete compressive strength f'ck = 42N / mm2
・ Length of I-type fittings a = 70mm
・ Width of I-type joint hardware b = 34mm
・ Increase rate of shear strength by steel fiber α = 1.7
Pull-out strength Pa = Pa1 × α = 123 kN × 1.7 = 210 kN. If the pull-out strength calculated in this way is superior to the pull-out force generated between the segments, there is no problem as the connecting structure 100. As shown in FIG. 3, it is preferable to place the bars on both sides of the I-type connecting hardware 30 because the pulling-out strength is improved.

  Next, the operation of connecting the segments when the connection structure 100 is used will be outlined. FIG. 4 is a diagram showing a procedure for connecting the precast members in the present embodiment. In this case, first, the one flange 31 and a part of the web 32 in the I-type connecting hardware 30 are inserted into the bag portion 45 through the insertion port 44 into the segment 15 as the other member described above (procedure 1).

  Next, the flange 31 and a part of the web 32 reaching the bag part 45 are guided to the web path 41 through the insertion opening 40 and the side opening 42 of the connecting part 43, and the contact surface 11 passes through the web path. Then, the flange 31 is fitted into the inner space 22 of the cylindrical connecting hardware 20 at a predetermined depth in the segment 15 (procedure 2).

  Subsequently, the contact surfaces 11 of the segment 10 and the segment 15 are brought into contact with each other (procedure 3). At this time, the other flange 31 and a part of the web 32 of the I-type connecting hardware 30 already fitted to the segment 15 are inserted into the bag portion 45 through the insertion port 44 of the segment 10.

  Further, the flange 31 and a part of the web 32 reaching the bag part 45 of the segment 10 are guided to the web path 41 through the insertion opening 40 and the side opening 42 of the connecting part 43 of the segment 10, The flange 31 is slid in the longitudinal direction of the contact surface 11 (procedure 4), and the flange 31 is fitted into the inner space 22 of the cylindrical connecting hardware 20 at a predetermined depth in the segment 10 (procedure 5). As described above, the connecting procedure between the segments is simple, and the procedure for fitting the flange 31 to the inner space 22 can be smoothly performed as a series.

--- Other embodiments ---
Then, the other form which fixes the end of the I-type connection metal fitting 30 to the other member 15 is demonstrated. FIG. 5 is a diagram showing a connection structure of precast members in another embodiment. Here, a pipe body 50 is provided on the end face 35 of the I-type connection hardware 30, and a rod body 55 is fitted to the pipe body 50 in advance. The cylindrical connecting metal 25 includes a closed abutting surface 24 and the opening 26 provided in the abutting surface 24. Unlike the cylindrical connecting metal 20 in the above embodiment, the inner space 22 is provided. The inner space extends from the contact surface 11 to the contact surface 11. In the inner space 22 of the cylindrical connecting metal 25 in this embodiment, one end of an I-type connecting metal 30 having a tube body 50 fitted with such a bar 55 is inserted. From the sky 22, the cylindrical connecting hardware 25 is disposed so as to protrude appropriately through the opening 26 of the cylindrical connecting hardware 25. The pipe body 50 provided in the I-type connection hardware 30 has a hollow structure provided with an opening 51. Moreover, the part which protruded from the said opening 26 of the cylindrical connection metal fitting 25 among the said rods 55 becomes the base part 56 embedded and fixed to the concrete which makes the substance of a segment, for example. On the other hand, a portion protruding from the opening 26 toward the inner space 22 is a protruding portion 57. The protruding portion 57 has a diameter that can be reliably fitted to the inner space 51 of the tube body 50.

  In such a structure, the flange 31a of the I-type coupling hardware 30 having the tube body 50 fitted with the rod body 55 (procedure a) is inserted into the inner space 22 of the cylindrical coupling hardware 25, and the foundation of the rod body 55 is obtained. The part 56 is protruded from the opening 26 of the abutting surface 24 (procedure b). Further, after the base portion 56 is projected, the cylindrical connecting metal 25 is closed by closing the plate material by contacting the opening surface 27 facing the abutting surface 24, for example, and placing concrete to form a segment. The base portion 56 protruding outside is attached and fixed to the surrounding concrete. On the other hand, the projecting portion 57 which is the opposite end portion of the base portion 56 maintains a state of being fitted in the opening 51 of the tubular body 50 and the inner space 22 of the cylindrical connecting metal 25. However, the fitting between the protruding portion 57 and the tubular body 50 is in a fitting state in which a predetermined margin is left until the fitting limit.

  In addition, when the fitting is performed, the flange 31a is slid toward the abutting surface 24 of the cylindrical connecting metal 25, thereby forming the wedge coupling state described in the above embodiment. In other words, a double fitting, that is, the fitting of the rod body 55 embedded and fixed in the surrounding concrete and the pipe body 50 and the fitting by the wedge coupling, is performed. Even if it is a case where rattling occurs in the I-type coupling hardware 30, such rattling is suppressed by the fitting of the tube body 50 and the rod body 55, and one end of the I-type coupling hardware 30 is the other member. At 15, it will be more securely fixed. One end of the I-type connection hardware 30 is fixed to the other member 15 by the processing so far.

  On the other hand, the other member 15 and the segment 10 are abutted via the contact surface 11 (procedure x), and the flange 31b at the other end of the I-type connection hardware 30 already fixed to the other member 15 as described above is provided. Suppose that it is inserted and slid toward the cylindrical connecting hardware 20 embedded in the interior of the segment 10 to be connected (FIG. 6: procedure y). Then, the I-type coupling hardware 30 and the cylindrical coupling hardware 20 are fitted together by the wedge coupling described in the above-described embodiment. The projecting portion 57 of the rod body 55 is more deeply fitted into the inner space 51 of the tube body 50 at 31 a, and one end of the I-type connection hardware 30 is more reliably fixed at the other member 15. (Enlarged drawings x to y to z). Of course, such a fitting structure is not only for fixing one end of the I-type coupling hardware 30 to the other member 15 but also for fitting the other end of the I-type coupling hardware 30 to the cylindrical coupling hardware 20 of the segment 10. It may be adopted.

  As described above, according to the present embodiment, the cylindrical connecting hardware such as a so-called C-shaped metal hardware is used by being arranged at a predetermined depth inside the precast member, that is, not inside the precast member, but in the precast member. Will do. In this way, the cylindrical connecting hardware arranged in the inner part instead of the abutting surface obtains a reaction force on the surrounding concrete to which it is fixed against the pulling force transmitted through the I-type connecting hardware. Demonstrate pulling strength (cone strength, punching shear strength). That is, unlike the conventional C-shaped metal fittings, the C-shaped metal hardware itself does not accept the pulling force, so that it is not necessary to adopt a thick cast iron thing as the cylindrical coupling hardware. Further, there is no need to arrange anchor bars as in the conventional C-shaped hardware, the connection structure is simple, and the cost can be further reduced. Therefore, the connection between the precast members can be achieved by a lightweight and low-cost metal fitting.

  In addition, it is possible to adopt a cylindrical connection hardware manufactured by processing a thin plate-like material in the connection structure, and to achieve a significant weight reduction compared to the conventional thick C-type hardware made of cast iron. It is possible. Further, by adopting a cylindrical connecting hardware manufactured only by inexpensive plate material processing instead of costly casting, the cost can be reduced as a matter of course.

  Also, a procedure for inserting the flange of the I-type connecting hardware and a part of the web into the bag part through the insertion port in the precast member to be connected, the flange and the part of the web leading to the bag part are connected to the connecting part. A procedure for guiding the web path through the insertion opening and the side opening and sliding the web path in the longitudinal direction of the abutment surface, and by the sliding, the flange is placed at a predetermined depth in the precast member. It is possible to smoothly perform the procedure of fitting into the inner space as a series.

  Further, in the connecting structure of the precast members, when the flange and the inner space of the cylindrical connecting metal fitting with the flange are wedge-shaped, the flange of the I-type connecting metal hits the web path. As the slide slides in the longitudinal direction of the contact surface and advances through the inner space of the cylindrical connecting hardware, the fitting becomes tighter, and the connection structure between the precast members becomes stronger.

  Therefore, according to the present embodiment, the connection between the precast members can be achieved by a lightweight and low-cost metal fitting.

  Although the embodiment of the present invention has been specifically described based on the embodiment, the present invention is not limited to this, and various modifications can be made without departing from the scope of the invention.

5 Predetermined length 10 Segment 11 Contact surface 15 Other member (segment)
20, 25 Cylindrical connecting metal 21 Slit-shaped opening 22 Inner space 23 of cylindrical connecting metal 23 Corner portion 24 Abutting surface 26 Abutting surface opening 27 Opening surface 30 facing the abutting surface I-type connecting metal 31 Flange (31a, 31b)
32 Web 33 Flange length 34 Corner portion 35 End face 40 of I-type connection fitting 40 Insertion opening 41 Web path 42 Side opening 43 Connection portion 44 Insertion port 45 Bag portion 50 Tube 55 Rod body 51 Opening 56 Base portion 57 Projection Part 100 connection structure

Claims (7)

A cylindrical connecting hardware having a slit-like opening in the longitudinal direction is embedded in a predetermined length inside a contact surface with another member in a precast member to be connected, and a predetermined length web connected to an end flange and the flange. One end of the I-shaped connecting hardware constituted by the other member is held by the other member, and the other end is inserted through an insertion port provided in the contact surface of the precast member and a predetermined inner space in the precast member continuous therewith. The precast member inserted toward the cylindrical connecting hardware, the flange is fitted in the inner space of the cylindrical connecting hardware, and the embedded depth of the cylindrical connecting hardware in the precast member is in contact with each other, and The pull-out force generated between the tubular connecting hardware and the I-shaped hardware in the other member is greater than the pulling-out strength according to the embedment depth of the cylindrical connecting hardware from the contact surface. Coupling structure of precast member characterized by embedding the depth of the case. In claim 1,
A connecting structure for a precast member, wherein the cylindrical connecting hardware is made of a plate-like material. In claim 1 or 2,
The predetermined inner space in the precast member continuous to the insertion port is
A bag portion that is a box-shaped region having a predetermined depth extending inward from the insertion port of the contact surface;
The contact surface is continuous with the insertion port, extends a predetermined length in the longitudinal direction of the contact surface, extends through the web in the depth direction of the bag portion, and extends from the bag portion. A connecting portion having a web path extending a predetermined depth in the precast member from the insertion opening to the installation location of the cylindrical connecting hardware;
It is comprised from these, The connection structure of the precast member characterized by the above-mentioned. In any one of Claims 1-3,
A connecting structure for a precast member, wherein the flange and an inner space of a cylindrical connecting metal fitting with the flange have a wedge shape, and both are wedge-coupled. In any one of Claims 1-4,
A precast having a structure in which reinforcement is arranged in a cone breaking region between the contact surface of the precast member and the cylindrical connecting hardware embedded in a predetermined length from the contact surface. Member connection structure. In any one of Claims 1-5 ,
A flange at one end of the I-shaped connection hardware includes a tube body into which a rod body is fitted in advance, and an end portion of the rod body from a predetermined opening provided by a cylindrical connection hardware installed in another member The flange is fitted into the inner space of the cylindrical connecting hardware in the other member so as to protrude,
By fixing the end of the rod protruding from the predetermined opening to the concrete placed around the cylindrical connecting hardware in the other member and fixing it, one end of the I-type connecting hardware is fixed in advance to the other member,
The flange at the other end of the I-type connection fitting is fitted into the inner space of the cylindrical connection fitting in the precast member to be connected, and a reaction force is obtained in this fitting operation, and the flange at the one end is fitted in advance. A connecting structure for precast members, wherein the joined pipe body and the rod body are fitted more deeply. In any one of Claims 1-5 ,
A precast member connection structure, wherein one end of the I-shaped connection hardware is embedded and fixed in the other member.

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