JP2000320023A - Connection structure of concrete product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the connection structure of a concrete product energizing proper push force on the connection face of the previously divided and manufactured concrete products to be mutually connected so as to be integrated. SOLUTION: The connection structure of this concrete product is provided with a first fixing rod steel 10 buried so that a female screw part 16 provided on the end of one concrete product A is opened, a second fixing rod steel 20 buried so that a male screw part 36 provided on the end of the other concrete product B is exposed in a recessed part opened in a connection end face and one side continuing to the connection end face, a male screw corresponding to the female screw part 16 of the first fixing rod steel 10, and a female screw member 30 locked loosely on the male screw part 36 of the second fixing rod steel 20. The respective concrete products are combined so as to be opposed to the mutual fixing rod steels, the male screw member 36 is tightened on the female screw part 16 to mutually the concrete products go as to be integrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete product connecting structure for connecting and integrating concrete products manufactured separately.

[0002]

2. Description of the Related Art Conventionally, concrete structures have been constructed by connecting concrete products manufactured in factories at a construction site for the purpose of improving quality and shortening the construction time at the site. However, large and heavy ones require large-scale manufacturing formwork, investment in associated factory equipment, and difficulties in stacking concrete products, requiring a large storage space. Large heavy equipment is required for transportation to the destination, which makes it difficult to carry it into narrow areas. Therefore, in recent years, the concrete products are manufactured in advance by being divided and connected at a construction site to construct a concrete structure. As a connecting structure for concrete products manufactured in advance by dividing, a connecting structure as shown in FIG. 9 has been frequently used.

[0003] UB shown in FIG. 9 (a) is an underdrain block for a waterway connecting a divided product a and a divided product b, which are divided and manufactured in advance in a factory. The divided products a and b have a substantially inverted U-shaped cross section and a U-shaped cross section, respectively, and embed an internal reinforcing bar having a similar shape inside thereof. Are provided so as to be exposed in the recessed portion provided in the first portion.

[0004] As shown in FIG.
b, the tips of the main bars c of the internal reinforcing bars are combined so as to abut each other, and the opposed tips are surrounded by copper abutments f and r which are divided into a front side and a back side, in an atmosphere of a shielding gas (carbon dioxide). Are welded individually, connected and integrated.

[0005]

However, since only the tips of the main reinforcing bars c and c of the respective internal reinforcing bars are welded to each other, the connecting surfaces t of the two divided products a and b are connected by applying a pressing force. In the case of welding work, it is difficult to make the connection state of the divided products uniform due to the ability of each worker and the weather at the construction site, etc. Not suitable for connecting concrete products for construction purposes.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to apply an appropriate pressing force to a connecting surface of a concrete product manufactured in advance so as to connect the concrete products to each other to integrally connect them. An object of the present invention is to provide a connection structure for a concrete product to be converted.

[0007]

In order to achieve the above object, a concrete product connecting structure of the present invention is a concrete product connecting structure in which concrete products are interconnected and integrated by a screw structure. A first fixing steel bar embedded in the product such that a female screw portion provided at the end thereof is opened to the connection end surface, and a male screw portion provided at the end portion of the other concrete product are provided with a connection end surface and the connection end. A second fixing steel bar embedded so as to be exposed in a concave portion opened to one side surface continuous to the end surface, and a male screw portion corresponding to a female screw portion of the first fixing steel bar, A male screw member movably locked to a male screw portion of a steel bar, combining respective concrete products so as to oppose mutual fixing steel bars, and tightening the male screw member to the female screw portion. Con It is characterized in that interconnected integrated lied product.

[0008] The concrete product connecting structure of the present invention is a concrete product connecting structure for interconnecting and integrating concrete products by a screw structure, wherein a female screw provided at one end of one concrete product is provided. The first anchoring steel bar embedded so that the portion is open to the connecting end surface, and the other concrete product is provided with a connecting end surface and a concave portion opening on one side continuous to the connecting end surface, and a female provided at the end portion. A second screw portion embedded so as to open into the concave portion;
A fixing steel bar, a locking member having a flange at one end and screwed to a female screw portion of the second fixing steel bar, and a male screw portion corresponding to the female screw portion of the first fixing steel bar, A male screw member movably locked to the locking member, and each concrete product is combined so that the fixing steel bars face each other, and a male screw member is attached to the female screw portion of the first fixing steel bar. The concrete products are interconnected and united by tightening.

According to the concrete product connecting structure constructed as described above, the concrete products to be connected to each other are combined by abutting the connecting end faces thereof so as to oppose both anchoring steel bars buried therein. (2) When the male screw member attached to the fixing steel bar is screwed into the female screw portion of the first fixing steel bar, the axial error of both fixing steel bars can be absorbed and the screw can be easily screwed. (1) At the time of fastening the female screw portion and the male screw member of the fixing steel bar, the fastening can be easily performed in a short time only by turning the male screw member without skill,
Further, if the male screw member is tightened to the female screw portion of the first fixing steel bar, it can be connected and integrated by applying a proper pressing force to the connection end surfaces of the concrete products.

[0010] Further, the female screw portion of the first fixing steel bar is provided with a holding member for holding a state after the male screw member is tightened, so that the male screw member is attached to the female screw portion of the first fixing steel bar. If the holding member is tightened after the tightening, it is possible to suppress the occurrence of plastic deformation in the connecting portion when an external force is applied to the connected and integrated concrete product.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, referring to FIGS.
The connection structure 100 according to one embodiment of the present invention will be described in detail.

FIG. 1 is a schematic explanatory view of the present invention, in which reference numerals A and B indicate concrete products (hereinafter referred to as divided products) manufactured in advance by dividing, and both divided products A and B are flat plates, respectively. It has an internal reinforcing bar 1 composed of a main bar 2, a force bar 3 and an auxiliary bar 4 inside, and is connected and integrated by a connecting structure 100 (110).

The connecting structure 100 has a first structure as shown in FIG.
Anchoring steel bar 10, second anchoring steel bar 20, male screw member 3
0, a locking member 40, and a holding nut 50.

The first fixing steel bar 10 comprises a deformed reinforcing bar 12 and a female screw member 14 welded to the end of the deformed reinforcing bar 12 by friction welding. The screw portion 16 is opened at the connection end surface At,
The internal reinforcing bar 1 is embedded in the divided product A so as to be parallel to the main reinforcing bar 2 and perpendicular to the connecting end surface At.

The second fixing steel bar 20 has a male screw portion 26 formed at an end of the deformed reinforcing bar 22, the male screw portion 26 is exposed to a concave portion 80 opened to the connecting end face Bt and the side face Bs, and the internal thread is formed. Connection end face Bt parallel to main reinforcement 2 of rebar 1
Embedded in the divided product B so as to be orthogonal to

In the embodiment shown in FIG. 1, the anchoring bars 10 and 20 are respectively joined to the internal reinforcing bars 1 and 1 by welding or bundling. It is not always necessary to join when the required adhesive force to is obtained. The embedded length and thickness of the deformed reinforcing bars 12 and 22 are appropriately selected according to various conditions such as external force applied to the product after connection.

The male screw member 30 has a male screw portion 36 corresponding to the female screw portion 16 of the first fixing steel bar 10 on the outer peripheral surface,
A play insertion hole 34 slightly larger in diameter than the male screw portion 24 of the second fixing steel bar 20 is formed from substantially the center of one end of the base portion 32, and from the jaw 35 at the end of the play insertion hole 34 to the tip of the male screw portion 26. It has a hollow portion 37 slightly larger in diameter than the penetrating locking member 40, and a tool engaging portion 39 formed in a toothed ring shape is provided on the outer periphery of one end of the base portion. Male screw part 2
4 is freely movably locked via a locking member 40 attached to a predetermined position. Further, as the tool engaging portion 39, a portion having a hexagonal or octagonal cross section may be provided on the outer periphery of one end of the base portion 32, or a plurality of concave portions or convex portions may be provided on the outer periphery of an intermediate portion of the base portion.

In the illustrated embodiment, the threads of the female thread 16 of the first fixing steel bar 10 and the male thread 36 of the male screw member 30 and the male thread 24 of the second fixing steel bar 20 are used.
Are threaded right-hand threads, but in order to prevent loosening at the time of fastening, which will be described in detail later, the female thread portion 16 of the first fixing steel bar 10 is used.
And the thread of the male thread portion 36 of the male thread member 30 is a right-hand thread and the thread of the male thread portion 24 of the second fixing steel bar 20 is a left-hand thread, or the female thread portion 16 of the first fixing steel bar 10 is used. Even if the thread of the male thread portion 36 of the male screw member 30 is a left-hand thread and the thread of the male thread portion 24 of the second fixing steel bar 20 is a right-hand thread, the connection between the two divided products A and B can be performed. .

With this connection structure 100, the two divided products A,
When connecting B, first, the retaining nut 50 is screwed into the male screw part 24 of the second fixing steel bar 20 of the divided product B to the deepest part, the male screw member 30 is loosely inserted, and The stop member 40 is screwed into a predetermined mounting position. At this time, if the locking member 40 is welded to the male screw portion 24, or if the threads of the male screw portion 24 and the male screw portion 34 of the male screw member 30 are reversed as described above, the engagement at the time of fastening is made. A change in the mounting position of the stop member 40 can be prevented.

Next, the connecting end faces of the two divided products A and B are brought into contact with each other so that the axis CL1 of the first fixing steel bar 10 and the axis CL2 of the second fixing steel bar 20 coincide with each other. The male screw portion 36 of the male screw member 30 movably attached to the steel bar 20 is screwed into the female screw portion 16 of the first fixing steel bar 10 and lightly tightened. Note that a projection is provided on the connecting end face At of the divided product A, and the connecting end face Bt of the divided product B is provided.
Is provided with a concave portion to be fitted to the convex portion, and both portions are fitted to each other, or the connecting end surfaces At,
If a recess is provided in Bt and a member that fits into the recess is interposed, the work of assembling the two divided products A and B can be simplified, and the shearing resistance of the connected portion after the connection can be improved.

Between the second fixing steel bar 20 and the insertion hole 34 of the male screw member 30, and between the locking member 40 and the male screw member 30.
Since a gap is provided between the first fixing steel bar 10 and the axis CL2 of the second fixing steel bar 20, the gap is provided between the hollow portion 37 and the hollow portion 37. 1 The male screw 36 of the male screw member 30 can be easily screwed into the female screw 16 of the fixing steel bar 10.

Next, if a dedicated tool (not shown) is engaged with the engaging portion 39 of the male screw member 30 and fastened with a predetermined torque,
The jaw 35 of the male screw member 30 is engaged with the locking surface 42 of the locking member 40.
And the male screw member 30 is in contact with the second
The fixing steel bar 20 is drawn in the arrow H direction, and the two divided products A and B can be connected in a predetermined pressure contact state.

Further, the male screw portion 2 of the second fixing steel bar 20 is formed.
When the external force is applied to the connected and integrated concrete product by tightening the holding nut 50 screwed into the screw 4, the male screw portion 24 and the male screw member 30 of the second fixing steel bar 20 are plastically deformed. Can be suppressed.

After the completion of the tightening step, a gap between the male screw member 30 and the locking member 40 through the through hole 38 of the male screw member 30,
Female screw part 1 of male screw member 30 and second fixing steel bar 20
6 is filled with a hardening material such as non-shrinkable mortar, and the inside of the recess 80 is also filled with the hardening material. Thereby, while being able to prevent loosening of each member in the connecting portion,
The shear resistance of the connecting portion can be improved.

Next, referring to FIG. 1 and FIGS. 5 to 7, a connection structure 110 according to another embodiment of the present invention will be described in detail.

As shown in FIG. 5, the connecting structure 110
Fixing steel bar 10, second fixing steel bar 25, male screw member 3
0, a locking member 45, and a holding nut 50.

The first fixing steel bar 10 is composed of a deformed reinforcing bar 12 and a female screw member 14 welded to an end of the deformed reinforcing bar 12 by friction welding. While the screw hole 16 is opened in the connection end face At,
The internal reinforcing bar 1 is embedded in the divided product A so as to be parallel to the main reinforcing bar 2 and perpendicular to the connecting end surface At.

The second fixing steel bar 25 is composed of a deformed reinforcing bar 27 and a female screw member 29 welded to an end of the deformed reinforcing bar 27 by friction welding. A screw hole 28 is opened in a concave portion 80 opened in the connection end face Bt and the side face Bs, and is embedded in the divided product B so as to be parallel to the main reinforcement 2 of the internal reinforcing bar 1 and orthogonal to the connection end face Bt.

The anchoring bars 10 and 25 are joined to the internal reinforcing bars 1 and 1 by welding or bundling, respectively, as in the connection structure 100 described above. When the required adhesive force is obtained, it is not always necessary to join them, and the embedded length and thickness of both deformed reinforcing bars 12, 27 are appropriately selected according to various conditions such as external force applied to the product after connection. Is done.

The locking member 45 has a flange 46 at one end of a male screw 48 corresponding to the female screw hole 28 of the second fixing steel bar 25, and is attached to the second fixing steel bar 25.

The male screw member 30 has a male screw portion 36 corresponding to the female screw portion 16 of the first fixing steel bar 10 on the outer peripheral surface.
A play insertion hole 34 slightly larger in diameter than the male screw 48 of the locking member 45 is formed from substantially the center of one end of the base 32, and the play insertion hole 34 is formed through the jaw 35 at the end of the play insertion hole 34 to the tip of the male screw part 26. The locking member 45 has a hollow portion 37 slightly larger in diameter than the flange portion 46, and a tool engaging portion 39 formed in a ring shape is provided on the outer periphery of one end of the base portion. Are freely movably locked through a locking member 45 attached to a predetermined position of the hologram. Further, as the tool engaging portion 39, a portion having a hexagonal or octagonal cross section may be provided on the outer periphery of one end of the base portion 32, or a plurality of concave portions or convex portions may be provided on the outer periphery of an intermediate portion of the base portion.

In the illustrated embodiment, the thread of the female screw portion 16 of the first fixing steel bar 10 and the male screw portion 36 of the male screw member 30 and the female screw hole 28 of the second fixing steel bar 25 are used.
The thread of the male screw 48 of the locking member 45 is a right-hand thread. However, in order to prevent loosening at the time of fastening, which will be described later in detail, the female screw 16 and the male screw 30 of the first fixing steel bar 10 are used. The thread of the male screw portion 36 of the second fixing steel bar 25 is set to the right thread, the thread of the female screw hole 28 of the second fixing steel bar 25 and the thread of the male screw 48 of the locking member 45 are set to the left screw, or the first fixing steel bar 10 The thread of the female thread 16 of the male screw member 30 and the thread of the male thread 36 of the male thread member 30 are left-handed threads, and the thread of the female threaded hole 28 of the second fixing steel bar 25 and the thread of the male thread 48 of the locking member 45 are right-handed. However, the connection of the two divided products A and B is feasible.

With this connecting structure 110, the two divided products A,
When connecting B, as a step before connection, first, the male screw member 30 is loosely inserted into the male screw 48 of the locking member 45, and the holding nut 50 is screwed in. Next, the locking member 45 to which the male screw member 30 and the holding nut 50 are mounted is inserted into the female screw hole 28 of the second fixing steel bar 20 of the divided product B, and the male screw 48 of the locking member 45 is mounted at a predetermined mounting position. Screw it in.
At this time, the locking member 45 is welded to the female screw member 29 of the second fixing steel bar 20, or the female screw portion 16 of the first fixing steel bar 10 and the male screw portion of the male screw member 30 as described above. 3
If the thread of No. 6 and the threads of the female screw hole 28 of the second fixing steel bar 25 and the male screw 48 of the locking member 45 are reversed, it is possible to prevent a change in the mounting position of the locking member 40 during fastening. .

Next, the connecting end faces of the two divided products A and B are brought into contact with each other so that the axis CL1 of the first fixing steel bar 10 coincides with the axis CL2 of the second fixing steel bar 25, and the second fixing is performed. The male screw portion 36 of the male screw member 30 movably attached to the steel bar 25 via the engaging member 45 is a first screw.
It is screwed into the female screw part 16 of the fixing steel bar 10 and lightly tightened. In addition, a convex portion is provided on the connecting end surface At of the divided product A, and a concave portion that fits into the convex portion is provided on the connecting end surface Bt of the divided product B. By providing a concave portion on each of the connection end surfaces At and Bt of B, and interposing a member that fits into the concave portion, it is possible to simplify the work of assembling the two divided products A and B, and to prevent the shearing of the connected portion after the connection. Strength can be improved.

The male screw 48 of the locking member 45 and the male screw member 3
0 and the jaw 46 of the locking member 45
Since a gap is provided between the first fixing steel bar 10 and the axis CL2 of the second fixing steel bar 25, there is a gap between the first fixing steel bar 10 and the hollow portion 37 of the male screw member 30. And the male screw portion 36 of the male screw member 30 can be easily screwed into the female screw portion 16 of the first fixing steel bar 10.

Next, a special tool (not shown) is engaged with the engaging portion 39 of the male screw member 30 and fastened with a predetermined torque.
The jaw 35 of the male screw member 30 is engaged with the locking surface 47 of the locking member 45.
And the male screw member 30 is in contact with the second
The fixing steel bar 25 is pulled in the direction of the arrow H, so that the two divided products A and B can be connected in an expected pressure contact state.

Further, by tightening the holding nut 50 screwed into the male screw 48 of the locking member 45, when an external force is applied to the connected and integrated concrete product, the male screw of the locking member 45 is formed. 48 and the male screw member 30 can be prevented from undergoing plastic deformation.

After the completion of the tightening step, a gap between the male screw member 30 and the locking member 45 is formed through the through hole 38 of the male screw member 30.
Female screw part 1 of male screw member 30 and second fixing steel bar 20
6 is filled with a hardening material such as non-shrinkable mortar, and the inside of the recess 80 is also filled with the hardening material. Thereby, while being able to prevent loosening of each member in the connecting portion,
The shear resistance of the connecting portion can be improved.

As described above, according to the concrete product connection structure 100 (110) of the present invention, connection can be easily performed irrespective of an error in the position of the opposite fixing steel bars.
In addition, only by turning the male screw member, an appropriate pressing force can be applied to the connection end face of the concrete product to uniformly connect the concrete product. Therefore, the connection state can be maintained for a long time without loosening of the connection portion.

Further, if a rust preventive is applied to each screw portion of the divided product before connection, or a covering cap or the like is attached, each screw at the time of stocking at a storage location or transporting to a construction site is provided. Corrosion, breakage, etc. of the part can be prevented, and the connection work at the time of connection can proceed smoothly.

FIG. 8 is an explanatory view of a concrete product connected by applying the present invention. FIG. 8A shows an example in which the present invention is applied to a large culvert block AB. The culvert block AB is a bottom slab block DB1 that has been previously divided and manufactured.
, Left and right side plate blocks DB2, DB2, and top plate block DB3. Left and right board block DB
2, a first fixing steel bar is buried inside DB2, and a second fixing steel bar is buried inside the bottom block DB1 and the top block DB3.
Interconnected and integrated. The shaded portions in the figure indicate the hardened material filled in each recess 80 after the completion of the fastening operation.

FIG. 8B shows an example in which the present invention is applied to a large waterway block YB. The waterway block YB is composed of L-shaped blocks DB4 and DB4, which are manufactured in advance by dividing, and a bottom block DB5. ing. L-shaped block D
A first fixing steel bar is buried inside B4 and DB4, and a second fixing steel bar is buried inside the bottom block DB5, and are interconnected and integrated by the above-mentioned connecting structure 100 (110). The shaded portions in the figure indicate the hardened material filled in each recess 80 after the completion of the fastening operation.

[0043]

Since the concrete product connecting structure of the present invention is constructed as described above in detail, the concrete product can be connected easily regardless of the error of the position of the fixing steel bar. Only by turning the member, the proper pressing force can be applied to the connecting end surface of the concrete product to uniformly connect it, and even if external force is applied to the connected concrete product, it can be connected to the connecting part. There is an effect that the connection state can be maintained for a long time without loosening.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of the present invention.

FIG. 2 is a sectional view showing a connection structure according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating the operation of the connection structure shown in FIG. 2;

FIG. 4 is an exploded perspective view of the connection structure shown in FIG. 2;

FIG. 5 is a sectional view showing a connection structure according to another embodiment of the present invention.

FIG. 6 is a diagram illustrating the operation of the connection structure shown in FIG. 5;

FIG. 7 is an exploded perspective view of the connection structure shown in FIG. 5;

FIG. 8 is an explanatory view of a concrete product connected by applying the present invention.

FIG. 9 is an explanatory diagram of a conventional technique.

[Explanation of Signs] A-Split product (one concrete product) B-Split product (the other concrete product) 10-First fixing steel bar 12-Deformed bar 16-Female screw part 20-Second fixing steel bar 22- Deformed bar 24-male screw part 30-male screw member 34-free insertion hole 36-male screw part 40-locking member 50-holding nut 80-recess 100-connection structure

Claims (3)

[Claims] 1. A concrete product connection structure for interconnecting and integrating concrete products by a screw structure, wherein the female screw portion provided at one end of the concrete product is embedded in the concrete product so as to open at the connection end surface. A second anchor embedded in the first anchoring steel bar and the other concrete product such that a male screw portion provided at the end thereof is exposed in a connection end face and a concave portion opened on one side surface continuous to the connection end face. And a male screw member having a male screw portion corresponding to the female screw portion of the first fixing steel bar and movably locked to the male screw portion of the second fixing steel bar. A concrete product connecting structure, wherein concrete products are interconnected and integrated by tightening a male screw member to the female screw portion to combine the concrete products so that the fixing steel bars face each other. . 2. A concrete product connecting structure for interconnecting and integrating concrete products by a screw structure, wherein the female screw portion provided at one end of the concrete product is embedded in the concrete product so as to open to the connecting end surface. The first fixing steel bar and the other concrete product are provided with a connecting end face and a concave portion opening on one side surface continuous with the connecting end surface, and a female screw portion provided on the end portion opens into the concave portion. A second fixing steel bar embedded in the first fixing steel bar, a locking member having a flange at one end and screwed to a female screw portion of the second fixing steel bar, and a male screw corresponding to the female screw portion of the first fixing steel bar And a male screw member movably locked to the locking member, wherein the respective concrete products are combined so that the fixing steel bars face each other, and a female screw of the first fixing steel bar is provided. By tightening the male screw member to the part Nkurito product interconnected integrated connection structure of the concrete product, characterized in that. 3. The concrete product connection structure according to claim 1, further comprising a holding nut for holding a state after tightening a male screw member on the female screw portion of the first fixing steel bar. .