JPH0540398U - Joint structure of concrete structure - Google Patents

Abstract

(57) [Summary] [Purpose] In a structure in which concrete structures are joined together, the joint recess is made as small as possible and the cost is reduced. [Structure] Both concrete makeup plates 1 to be joined
First and second embedding nuts 22 and 23 having screw holes 22a and 23a whose screw-up manners are opposite to each other are embedded in the joint ends of 0 and 11, respectively.
First and second bolts 2 respectively screwed to 23
Joint recess 1 in which 8, 29 are formed in each of the decorative plates 10 and 11
Screw connection at 8 and 19. Joint recess 18,19
Need only have a size that enables the work of screw-connecting the first and second bolts 28, 29, so that the size can be smaller than before, and the bolts and nuts can be Since the joint structure is combined, it can be constructed at low cost.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint structure for joining concrete structures such as a decorative plate and a reinforcing plate made of concrete, which form a wall surface of a tunnel.

[0002]

[Prior Art]

 When a new concrete decorative plate is installed and repaired on the tunnel wall surface, or when a concrete reinforcing plate is installed and reinforced, these joints are joined to each other as shown in Fig. 4, (in this case). A plate-shaped joint metal fitting 4 to which an anchor bar 3 is welded is embedded in the joint end surface 2 of the decorative plate 1, and a joint recess 5 formed inside the joint metal fitting 4 is used to join the joints. Generally, the metal fittings 4 are fastened together with bolts 6 and nuts 7. The joint recess 5 is open to the inner surface side of the decorative plate 1 which is the inner surface of the tunnel.

[0003]

[Problems to be solved by the device]

 The joint recess 5 is required to be as small as possible in order to maintain the aesthetic appearance of the inner surface of the tunnel, but the required size for allowing the bolt 6 to penetrate the joint fittings 4, 4. It is necessary and there is a limit to how small it can be made. Further, since the joint tool 4 needs to have a joint strength of a certain level or higher, it must be of a certain size and thickness, and is usually made of steel, which causes an increase in cost.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a joint structure for a concrete structure in which the joint recess can be made as small as possible and at low cost. There is.

[0005]

[Means for Solving the Problems]

 The present invention forms a joint end face and joint recesses that open on at least one face continuous with the joint end face at the joint end portions of both concrete structures to be joined, and is substantially orthogonal to the joint end face. Then, each of the bolt insertion holes that open in the joint recess is formed, and at the end of the bolt insertion hole of one of the concrete structures, a first embedded nut whose screw hole is substantially coaxially communicated with the bolt insertion hole is formed. At the end of the bolt insertion hole of the other concrete structure, a screw hole is passed through the bolt insertion hole in a substantially coaxial manner, and the winding of the screw in the screw hole is the same as that of the first embedded nut. A second embedding nut formed in the opposite direction is embedded, and the second embedding nut is inserted from the joint recess of one concrete structure into the bolt insertion hole and screwed into the first embedding nut. 1 bolt and others The concrete structure of the second bolt, which is inserted from the joint recess into the bolt insertion hole and screwed into the second embedded nut, is screwed in each joint recess. It has a feature.

[0006]

[Action]

 According to the present invention, when the first bolt and the second bolt are screwed together, the first and second embedded nuts to which these bolts are screwed are opposite to each other. The makeup plates of are attracted to each other and joined. The size of the joint recess need only be small enough to allow the first bolt and the second bolt to be screwed together. As a result, the aesthetics of the inside of the tunnel can be maintained. Further, since the joint structure is a combination of bolts and nuts, it can be constructed at a lower cost than conventional steel plate-shaped joint fittings.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numerals 10 and 11 are decorative plates (concrete structures) made of first and second concrete to be joined to each other. The two decorative plates 10 and 11 form a tunnel wall surface, are plate-shaped with the same thickness, and are joined together in the plane direction with their joint end faces 12 and 13 aligned. In FIG. 1, the upper surfaces 14 and 15 of both decorative plates 10 and 11 are the inner surfaces of the tunnel, and the lower surfaces 16 and 17 thereof are the outer surfaces of the tunnel. In this case, the second makeup plate 11 is an existing makeup plate that has already been joined, and the first makeup plate 10 is joined to the existing makeup plate.

Joint end faces 12 and 13 and joint recesses 18 and 19 that open to the outer surfaces continuous with the joint end faces 12 and 13 are formed at the joint ends of the two decorative plates 10 and 11, respectively. .. The joint recesses 18 and 19 are formed in plural numbers at intervals in the width direction of the decorative plates 10 and 11 (front and back direction with respect to the paper surface in FIG. 1). Further, the two decorative plates 10, 11 are respectively formed with bolt insertion holes 20, 21 which are orthogonal to the joint end faces 12, 13 and open in the joint recesses 18, 19. Although the bolt insertion holes 20, 21 are round holes, they have a tapered shape in which the diameter is reduced toward the inner side of the decorative plates 10, 11.

First and second embedding nuts 22 and 23 are embedded at the ends of the bolt insertion holes 20 and 21 of both decorative plates 10 and 11, respectively.

Flanges 24, 25 are welded to the end faces of the embedded nuts 22, 23 on the joint end faces 12, 13 side, and the openings on the side of the anti-joint end faces 12, 13 are welded on the cover plate 26, Blocked by 27.

A screw hole 22a of the first embedded nut 22 is coaxially communicated with the bolt insertion hole 20, and the screw hole 22a is a right-handed screw whose winding direction is a normal upward movement.

On the other hand, also in the second embedded nut 23, the screw hole 23 a is coaxially communicated with the bolt insertion hole 21, but the screw hole 23 a is different from the first embedded nut 22 in the winding manner. On the contrary, that is, a left-handed screw that goes up to the left.

In FIG. 1, 28 is a first bolt screwed into the first embedding nut 22, and 29 is a second bolt screwed into the second embedding nut 23. is there.

The first bolt 28 has a threaded portion 28 a formed at one end, and the first nut 30 is welded at the other end. The screw portion 28a is a right-hand screw that can be screwed into the screw hole 22a of the first embedded nut 22. The first nut 30 has a relatively long axial length, the formed screw hole 30a is a right-hand thread, and one end thereof is fitted to the end opposite to the screw portion 28a of the first bolt 28. It is welded. A setting mark 31 which is a groove along the circumferential direction is engraved on the peripheral surface of the first bolt 28 near the welded portion of the first nut 30.

The first bolt 28 is inserted into the bolt insertion hole 20 from the threaded portion 28 a side, and the threaded portion 28 a is attached to the first embedded nut 22 until the setting mark 31 is aligned with the opening 20 a of the bolt insertion hole 20. The screwed state is the setting state of the first bolt 28 with respect to the first makeup plate 10. In this state, the tip end of the first nut 30 is slightly outside and remains in the joint recess 18. Further, the screw portion 28 a of the first bolt 28 is screwed into the first embedded nut 22 by a predetermined amount.

On the other hand, the second bolt 29 has a threaded portion 29a formed at one end and threaded portions 29b and 29c formed at the other end, respectively. The screw portion 29a is a left screw that can be screwed into the screw hole 23a of the second embedded nut 23. The screw portions 29b and 29c are right-hand threads that can be screwed into the first nut 30 described above, and are formed from the other end side of the second bolt 29, respectively. A fitting mark 32, which is a groove along the circumferential direction, is engraved between the screw portions 29b and 29c.

A second nut 33 is welded to an end portion on the inner side of the screw portion 29c, and a lock nut 34 is screwed from the screw portion 29b to the screw portion 29c. The second nut 33 is slightly longer in the axial direction than the lock nut 34, and the circumferential surface of the second bolt 29 in the vicinity of the welded portion of the second nut 33 is a groove along the circumferential direction. A setting mark 35 is engraved. The fitting mark 32 can be seen without being hidden by the lock nut 34 in a state where the lock nut 34 is screwed into the screw portion 29c until it hits the second nut 33.

The second bolt 29 is inserted into the bolt insertion hole 21 from the screw portion 29a side, and the screw portion 30a is attached to the second embedded nut 23 until the setting mark 35 is aligned with the opening 21a of the bolt insertion hole 21. A state in which the second bolt 29 is set to the second decorative plate 11 is a state in which the lock nut 34 is screwed in and screwed into the threaded portion 29c until it hits the second nut 33. In this state, the second nut 33 and the lock nut 34 are in the joint recess 19, and the second bolt 29 (screw portion 29b) is slightly out of the joint recess 19. Further, the screw portion 29 a of the second bolt 29 is screwed into the second embedded nut 23 by a predetermined amount.

Now, the procedure for joining the decorative plates 10 and 11 with the first and second bolts 28 and 29 set on the decorative plates 10 and 11 as described above will be described below.

First, as shown in FIG. 1, the joining ends 12 and 13 of the decorative plates 10 and 11 are brought close to each other by abutting the first nut 30 and the second bolt 29. From this state, the second nut 33 is stopped with a spanner to make the second bolt 29 non-rotatable, and the spanner fitted to the first nut 30 rotates the first bolt 28 in the pulling direction. 2, that is, by turning it to the left, the first nut 30 is screwed onto the threaded portion of the second bolt 29 until its tip reaches the fitting mark 32 of the second bolt 29, as shown in FIG. It is screwed to 29b. As a result, the threaded portion 28a of the first bolt 28 comes out of the first embedding nut 22 by the length from the fitting mark 32 of the second bolt 29 to the tip, as compared with the setting state. In this state, about half the screwing amount of the screw portion 28a with respect to the first embedded nut 22 is secured.

Contrary to the above, the first nut 30 is stopped by a wrench to make the first bolt 28 non-rotatable, and the wrench fitted to the lock nut 34 causes the second bolt 29 to move to the threaded portion. 29b is rotated in the direction in which it is screwed into the first nut 30. When the second bolt 29 is rotated in the same direction, the screw portion 29a, which is the screwing direction opposite to the screwing direction of the screw portion 29 with respect to the first nut 30, becomes the second embedded nut 23. Will be screwed into. Therefore, as shown in FIG. 3, the makeup plate 10 is pulled toward the makeup plate 11 so that the joint end faces 12 and 13 contact each other, and further, the screw portion 29 b is fixed to the first nut by a spanner fitted to the lock nut 34. By being screwed into 30, the joint end faces 12 and 13 are brought into close contact with each other, and the decorative plates 10 and 11 are brought into a state of being joined to each other.

Next, the lock nut 34 is tightened to the tip of the first nut 30 until it comes into a pressure contact state, the second bolt 29 is prevented from coming off from the first nut 30, and the joining operation is completed. .. This joining operation can be performed by utilizing the joint recesses 18 and 19 of the decorative plates 10 and 11. After the work is completed, the joint recesses 18 and 19 are filled with the motor 36.

According to the joint structure of the decorative plate according to the above-described embodiment, the joint recesses 18 and 19 of the decorative plates 10 and 11 rotate the first and second nuts 30 and 33 or the lock nut 34. The first and second bolts 28, 29 need only be large enough to be screwed together. Therefore, as compared with the conventional joint recess required for penetrating the bolt into the joint fitting, its size is extremely small, and as a result, the aesthetic appearance of the inner surface of the tunnel can be maintained.

Further, since the joint structure is a combination of bolts and nuts, it can be constructed at a lower cost than the conventional steel plate-like joint fitting.

Further, the first and second bolts 28 and 29 are respectively screwed into the first and second embedding nuts 22 and 23 at the time of initial setting for the decorative plates 10 and 11, respectively. Also, the setting marks 31, 35 and the fitting mark 32, which allow the user to clearly see the screwing amount of the second bolt 29 with respect to the first nut 30, are engraved respectively. It can be set accurately without making a mistake.

Further, since each of the bolt insertion holes 20 and 21 has a taper shape that reduces in diameter as it goes toward the back of the decorative plates 10 and 11, when the decorative plates 10 and 11 are put together, some eye-opening may occur. Even if a difference occurs, the bolts 28 and 29 can be joined by absorbing the difference by the taper amount.

In the present invention, the screw connecting means for connecting the first bolt 28 and the second bolt 29 is not limited to the above embodiment.

[0029]

[Effect of the device]

 As described above, according to the joint structure of the concrete structure of the present invention, at the joint ends of both concrete structures to be joined, the joint end face and at least one surface continuous with the joint end face are provided. In addition to forming joint recesses that open to the joint, also form bolt insertion holes that open to the joint recess approximately orthogonal to the joint end face, and insert the bolt insertion holes at the ends of the bolt insertion holes of one concrete structure. The first embedding nut, through which the screw hole communicates substantially coaxially, is embedded in the hole, and the screw hole substantially coaxially communicates with the bolt insertion hole at the end of the bolt insertion hole of the other concrete structure. The second embedding nut, in which the way the screw of the hole winds up is formed opposite to that of the first embedding nut, is embedded, and from one of the concrete structures, from the joint recess to the bolt insertion hole. The first bolt that is screwed into the first embedded nut through the bolt, and the other concrete structure is inserted into the bolt insertion hole from the joint recess and is screwed into the second embedded nut. The second bolt thus made is screwed in each of the joint recesses, and the joint recess is only capable of screw-connecting the first bolt and the second bolt. The size is smaller than before, and the joint structure that combines bolts and nuts reduces the cost compared to conventional steel plate-like fittings. It has the effect of being composed of.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a setting state of a joint structure according to an embodiment of the present invention with respect to a decorative plate.

FIG. 2 is a cross-sectional view showing a first stage of a work procedure of the joint structure.

FIG. 3 is a cross-sectional view showing a second stage of the work procedure of the joint structure.

FIG. 4 is a cross-sectional view of a conventional joint structure.

[Explanation of symbols]

 10 1st makeup plate (concrete structure) 11 2nd makeup plate (concrete structure) 12, 13 Joint end surface 18, 19 Joint recess 20, 21 Bolt insertion hole 22, 23 Embedded nut 28 1st Bolt 29 second bolt 30 first nut 32 second nut

Claims (1)

[Scope of utility model registration request] 1. A joint structure for joining concrete structures, such as a concrete decorative plate and a reinforcing plate, which form the wall surface of a tunnel, to a joint end of both concrete structures. An end face and a joint recess that is open to at least one face that is continuous with the joint end face are formed, and a bolt insertion hole that is substantially orthogonal to the joint end face and that opens into the joint recess is formed. At the end of the bolt insertion hole of the object, a first embedding nut in which a screw hole communicates with the bolt insertion hole substantially coaxially is embedded, and at the end of the bolt insertion hole of the other concrete structure,
A screw hole is passed through the bolt insertion hole substantially coaxially, and a second embedding nut is embedded in which the screw winding direction of the screw hole is opposite to that of the first embedding nut. Bolt inserted into the bolt insertion hole from the joint recess of the concrete structure and screwed into the first embedded nut, and the bolt from the joint recess of the other concrete structure A joint structure for a concrete structure, wherein a second bolt, which is inserted into the insertion hole and screwed into the second embedded nut, is screwed in each of the joint recesses.