JP3510879B2 - Coupler - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector useful when connecting concrete blocks at a construction site.

[0002]

2. Description of the Related Art Concrete blocks used for constructing concrete structures such as beams, retaining walls, underdrains and waterways have the purpose of improving work efficiency, accuracy and quality control.
It is produced outside the construction site. However, in the case where the block itself is large and heavy or has a complicated shape, the work load and cost for transportation increase, and a large storage space is required.

Therefore, in recent years, a method has been adopted in which the concrete block is divided and manufactured in advance, and the divided block is carried into a construction site and connected as necessary. For example, as shown in FIG. 22, an underdrain block having a predetermined shape is divided into upper and lower parts in advance and manufactured, and the divided blocks 201 and 202 are connected at a construction site.

Recesses 201a and 202a are formed at intervals on the side surfaces of the end portions of the divided blocks 201 and 202 on the side of the connecting surface. In addition, each recess 201a,
Ends 201b and 202b of the internal reinforcing bars embedded in the block are exposed in 202a.

When connecting the divided blocks 201 and 202, the two divided blocks 201 and 202 are assembled as shown in the figure with a packing (not shown) interposed therebetween. Then, the reinforcing bar ends 201b and 202b facing each other are individually welded to integrate the two divided blocks 201 and 202.

[0006]

[Patent Document 1] JP-A-58-191868

[Patent Document 2] Japanese Patent Laid-Open No. 63-118433

[0007]

However, in the above-described connecting method, since it takes 5 to 10 minutes to weld each location, a series of connecting operations is completed even if a plurality of welding operators are used. It takes a considerable amount of time before welding, and variations in welding quality are likely to occur due to environmental conditions and the ability of workers.

Also, the end portions 201b and 202b of the internal rebars
Since they are simply welded together, the packing cannot be pressed sufficiently during connection. That is, it is difficult to connect the two divided blocks 201 and 202 in a proper pressure contact state with the packing sandwiched therebetween, and it is difficult to secure desired airtightness and watertightness.

The present invention was created in view of the above circumstances, and an object of the present invention is to provide a connector which can firmly connect concrete blocks in a proper pressure contact state.

[0010]

In order to achieve the above object, the connector of the present invention comprises a plurality of recesses having openings on the connecting surface side and the side surface side, and a male screw portion provided at the tip. A first concrete block in which a plurality of first connecting rods are embedded so as to be exposed in each of the recesses;
A plurality of recesses having openings on the connection surface side and the side surface side are provided corresponding to the recesses of the first concrete block, and a plurality of second screw threads are provided so that the male screw portions provided on the tip end are exposed in each recess. A connector used when interconnecting a second concrete block in which a connecting rod is embedded, wherein a non-through female screw hole into which a male screw portion of the first connecting rod can be screwed is provided at the center. A first tightening member that is attached to the first connecting rod by screwing a non-penetrating female screw hole into the external male screw portion of the first connecting rod, An insertion hole having a diameter slightly larger than the outer diameter is provided in the center, and a female screw hole that can be screwed into the external male screw portion of the first tightening member is provided with a step between the insertion hole and the insertion hole. Insert into the male thread on the tip of the second connecting rod. Attached to the second connecting rod by covering the second connecting rod with the second tightening member, and by screwing the second tightening member onto the second connecting rod and then screwing into the male screw end of the second connecting rod. In the mounted state, the main feature is that the second fastening member includes a nut that restricts the movement of the second fastening member in the direction toward the tip of the second connecting rod by contact with the step.

According to this connector, the first fastening member is attached to the first connecting rod by screwing the non-penetrating female screw hole into the male screw portion of the tip of the first connecting rod, and the insertion hole is formed into the second connecting rod. The second tightening member is covered with the second connecting member by inserting the second tightening member onto the second connecting rod by inserting the second tightening member into the second male screw part.
After covering the connecting rod, the nut is attached to the second connecting rod by screwing it onto the male thread of the tip of the second connecting rod.
After that, the connecting surface of the first concrete block and the connecting surface of the second concrete block are combined so that the recesses of the second and third connecting blocks are aligned with each other, and the second tightening members covered on the respective second connecting rods are rotated, respectively. By screwing the screw holes into the external male screw portions of the respective first tightening members attached to the respective first connecting rods and tightening them, the second connecting rods of the connecting rods facing each other are moved to the second connecting rods.
A state in which the first connecting rod is drawn toward the second connecting rod direction via the first tightening member while the first connecting rod is drawn toward the second connecting rod direction via the nut that abuts the step of the tightening member, and a predetermined drawing force is applied. Can be maintained.

[0012]

1 to 5 show an embodiment of the present invention. 1 to 5, reference symbols DB1 and D
B2 is a divided block, 10 is an internal rebar, 30 is a connecting rod, and 50 is a connector.

The divided blocks DB1 and DB2 are for beam blocks and are connected left and right to form a beam block having a predetermined shape (see FIG. 1). This divided block DB1 and DB2
Is a precast concrete product manufactured in advance at a place other than the construction site, and is delivered to the construction site without being connected.

Each of the divided blocks DB1 and DB2 has a reinforcing internal reinforcing bar 10 built therein. The internal reinforcing bars 10 are arranged so as to connect the eight main bars 11 parallel to each other, the four stirrup bars 12 arranged so as to surround the outer side of the main stirrup 11 and the ends of the stirrup bars 12. 4 auxiliary muscles 1
3, the divided blocks DB1 and DB2 are assembled in a similar shape and then joined by welding or another method to be integrated. Of course, one having a structure other than the illustrated example may be used as the internal rebar, and one having a reinforcing bar (not shown) parallel to the main bar 11 may be used as the internal rebar.

Further, recesses 40 having openings on the upper and lower surfaces and the connecting surface side are provided on the upper and lower surfaces of the connecting surface side of the divided block DB1 and on the upper and lower surfaces of the connecting block side of the divided block DB2. Two are formed at a time.

Further, four connecting rods 30 each having a predetermined length are embedded in each of the divided blocks DB1 and DB2 so as to be parallel to the main bar 11. In the illustrated example, a deformed bar is used as the connecting rod 30, and the connecting rod 30 is joined to the internal reinforcing bar 10 by welding or another method. That is, the divided block D
B1 and DB2 are manufactured using the internal rebar 10 in which the connecting rod 30 is integrated. Also, each connecting rod 3
0 has a male screw portion 30a at one end thereof, and the male screw portion 30a is exposed in each recess 40.

By the way, the thickness of the connecting rod 30 is appropriately selected according to the weight of the divided blocks to be connected and the external force applied to the beam block after connection. In addition, the size of the connector 50, which will be described in detail later, also depends on the size of the connecting rod
It is appropriately selected according to the thickness of 0 and the same conditions as described above.

For example, in the beam block according to the present embodiment, the tensile force acts on the lower surface side and the compressive force acts on the upper surface side. Therefore, on the lower surface side on which the tensile force acts, the upper surface side on which the compressive force acts. Instead, it is preferable to use a thick connecting rod 30 and a corresponding large-sized connecting device 50. Of course, even if the thickness of the connecting rod 30 and the size of the connecting device 50 are the same, the number of connecting rods 30 and connecting devices 50 on the lower surface side where the pulling force acts is larger than that on the upper surface side where the compressing force works. Good.

Further, in the present embodiment, the deformed rebar having the convex surface portion is used as the connecting rod 30, and the connecting rod 30 is integrated with the internal reinforcing bar 10, so that the connecting rod 3 is formed.
The desired tensile strength is set to 0.
If the desired tensile strength can be obtained without integrating the connecting rod 30 with the internal rebar 10, the connecting rod 3
It is not always necessary to bond 0 to the internal rebar 10.

As shown in FIGS. 3 and 4, the connector 50 includes a first tightening member 51 and a second tightening member 52.
And two nuts 53 that can be attached to the male screw portion 30a of the connecting rod 30.

The first tightening member 51 is the connecting rod 30.
Insertion hole 51a having a diameter slightly larger than the outer diameter of
And an insertion hole 51b having a diameter slightly larger than the outer diameter of the nut 53 via a step 51c. Further, a nut-shaped portion 51d with which a tool (not shown) such as a wrench can be engaged is provided at the end of the first tightening member 51 on the insertion hole 51a side. Further, a male screw portion 51e is provided on the outer surface of the insertion hole 51b of the first tightening member 51.

The second tightening member 52 is connected to the connecting rod 30.
Insertion hole 52a having a diameter slightly larger than the outer diameter of
And a female screw hole 52b corresponding to the male screw portion 51e,
It has through the step 52c. Further, a nut-shaped portion 52d that can be engaged with a tool (not shown) such as a wrench is provided at the end of the second tightening member 52 on the insertion hole 52a side.

As can be seen from the drawings, the threads of the male screw portion 51e of the first tightening member 51 and the female screw hole 52b of the second tightening member 52 in this connector 50 are both right-hand threads, and the connecting rod 30 The threads of the male screw portion 30a are all left-handed threads. Of course, at least one of the threads of the male thread portion 30a of the connecting rod 30 is a right-hand thread, or the threads of the male thread portion 51e of the first fastening member 51 and the female thread hole 52b of the second fastening member 52 are left. Even with screws, it is possible to carry out the desired block connection.

When connecting the two divided blocks DB1 and DB2 by the connecting device 50, first, as shown in FIG. 5, the connecting rod 30 of one divided block DB1 is connected.
The second tightening member 52 is covered on the outer side of the exposed portion of and the nut 53 is attached to the male screw portion 30a. Further, the first tightening member 51 is covered on the outside of the exposed portion of the connecting rod 30 in the other divided block DB2, and the nut 53 is attached to the male screw portion 30a. It should be noted that depending on the relationship between the facing distance between the connecting rods 30 and the sizes of the components of the coupler 50 when the blocks are combined, this mounting operation can be performed after the blocks are combined, which will be described later.

By attaching a mark indicating the nut mounting position to each male screw portion 30a, the mounting position of the nut 53 on the male screw portion 30a can be easily determined. Further, if an adhesive is applied to the inner surface of the nut 53 in advance, or if two nuts having a small thickness are used as the nut 53 and one nut is fixed to the other nut, the nut mounting position varies. Can be prevented.

Next, two divided blocks DB1 and DB2
The connecting surfaces are combined so that the recesses 40 of the connecting rods match each other, in other words, the center lines CL (see FIG. 5) of the connecting rods 30 of the connecting rods match each other with a packing (not shown) interposed therebetween. By the way, if the connecting surface of the divided block DB1 and the divided block DB2 is provided with a convex portion and a concave portion that engage with each other, the above-mentioned combination work can be easily performed, and the shear resistance of the blocks after the coupling can be improved. Can be improved.

Next, the tightening members 51 and 52 attached to the connecting rods 30 facing each other are turned by fingertips,
The male screw portion 51e of the first tightening member 51 is lightly screwed into the female screw hole 52b of the second tightening member 52.

Next, the nut-shaped portion 51d of the first tightening member 51 and the nut-shaped portion 52d of the second tightening member 52.
While the tool is engaged with the tightening member, the tightening members 51 and 52 are rotated in opposite directions, or by rotating only the other tightening member while holding one tightening member, the male screw of the first tightening member 51 is rotated. Second part 51e
The tightening member 52 is tightened in the female screw hole 52b.

As the tightening progresses, the nuts 53 attached to the male screw portions 30a of the connecting rods 30 come into contact with the step 51c of the first tightening member 51 and the step 52c of the second tightening member 52. When the tightening is further continued after this, the connecting rods 30 are attracted in the direction of the arrow in FIG. 3, whereby the connecting surfaces of the divided blocks DB1 and DB2 are pressed against each other via the packing without a gap. Divided block DB1 and divided block DB2
In order to press the connection surfaces of (1) and (3) without unevenness, it is desirable that the above-mentioned tightening work is uniformly performed on the four connectors 50.

By this tightening, a pulling force in the direction of the arrow in FIG. 3 acts on each connecting rod 30, but as described above, each connecting rod 30 has a sufficient strength (adhesion force to concrete) against this. ) Is secured, the connecting rod 30 does not slip out of the block during tightening. Also, each connecting rod 3
Since the tensile force acting on 0 is dispersed in the block via the concrete contact surface, cracks due to local stress concentration do not occur.

Further, the insertion hole 51 of the first tightening member 51.
Since there is some play between a and the connecting rod 30 and between the insertion hole 52a of the second tightening member 52 and the connecting rod 30, there is a deviation in the center lines CL of the connecting rods 30 facing each other. However, this deviation can be absorbed by the play so that the connecting work can be properly performed.

Further, the direction of the threads of the male screw portion 51e of the first tightening member 51 and the female screw hole 52b of the second tightening member 52 and the direction of the screw threads of the male screw portion 30a of the connecting rod 30 are reversed. Therefore, during the tightening work,
The nut 53 attached to the male screw portion 30a of the connecting rod 30 does not loosen. Of course, as described above, the inner surface of the nut 53 attached to the male screw portion 30a may be previously coated with an adhesive material, or the nut 53 may be applied.
Even when two nuts having a small thickness are used and one nut is fixed to the other nut, the same loosening prevention effect as described above can be obtained.

The above-mentioned tightening work is performed in the divided block DB.
1 and the divided blocks DB2 continue until they come into pressure contact with each other through the packing under a predetermined pressure, whereby the two divided blocks DB1 and DB2 are firmly connected.

After the tightening work is completed, a hardening material (not shown) is filled in each recess 40 and hardened. As the hardening material, reinforced mortar made of a mixture of mortar and resin can be preferably used. As a result, the connector 50 is prevented from loosening, and the shear resistance of the joint is improved. This completes a series of connecting operations.

According to the concrete block connection structure described above, a simple operation of rotating at least one of the first tightening member 51 and the second tightening member 52 using a tool after combining the divided blocks DB1 and DB2 Thus, the connecting surfaces of the divided blocks DB1 and DB2 can be pressed against each other via the packing to firmly connect the blocks DB1 and DB2.

Further, since the tightening work can apply a pulling force to the connecting rods 30 facing each other to sufficiently press the packing, the divided block DB1
By connecting DB2 and DB2 in an appropriate pressure contact state, desired airtightness and watertightness can be accurately ensured.

Further, since the pulling force can be applied to the connecting rods 30 facing each other, the divided blocks DB1 and DB2 will not be loosened even if a force is applied from the outside, and the divided blocks DB1 and DB2 can be connected for a long period of time. The condition can be maintained in good condition.

Furthermore, since the connector 50 can be made compact and the connector 50 can be easily retrofitted to the divided blocks DB1 and DB2, it is necessary to keep the connector 50 attached to the block before coupling. Without connector 5
There is an advantage that 0 can be stored and managed in another place.

Instead of the nut-shaped portion 51d of the first tightening member 51 and the nut-shaped portion 52d of the second tightening member 52, a toothed portion (rectangular grooves at equal intervals in the circumferential direction) as shown in FIG. Lined portions) 51f and 52e may be provided. In this case, the toothed portions 51f and 52
A tool having a protrusion that can be engaged with e is used as a tool.

Further, it is possible to prevent the connecting rod 30 and the fastening members 51 and 52 from being plastically deformed by an external force applied to the blocks after connection, and to maintain the connection strength, watertightness and airtightness of the blocks in good condition. The method shown in FIG. 7, FIG. 8 or FIG.

In the method shown in FIG. 7, two fixing nuts 54 are attached to each of the male screw portions 30a of the connecting rod 30 in advance, and after the tightening work of the first tightening member 51 and the second tightening member 52 is completed. The first tightening member 51 and the second tightening member 5 are tightened by tightening the fixing nut 54.
2 is fixed. Of course, even if the number of fixing nuts 54 is one, the same fixing can be performed.

In the method shown in FIG. 8, the first tightening member 51 is used.
At least one injection hole 51g communicating with the insertion holes 51a and 51b is formed on the outer surface of the second fastening member 52, and the injection hole 52 communicating with the insertion hole 52a and the female screw hole 52b is formed on the outer surface of the second tightening member 52.
At least one f is formed, and the hardening material HM is injected into either one of the injection holes from the injection nozzle PN. The injected hardening material HM has a female screw hole 52b.
Between the male screw portion 51e and the insertion hole 51a, 52a
And enters into the gap between the connecting rod 30 and hardens. As this hardening material HM, one prepared by mixing an extender or the like with an epoxy or polyester resin can be preferably used.

In the method shown in FIGS. 9 (A) and 9 (B), a predetermined amount of the hardening material HM is previously filled in the female screw hole 52b of the second tightening member 52, and then the female screw of the second tightening member 52 is formed. The male screw portion 51e of the first tightening member 51 is tightened in the hole 52b. The hardening material HM enters the gap between the female screw hole 52b and the male screw portion 51e or the gap between the insertion holes 51a and 52a and the connecting rod 30 in accordance with the tightening, and hardens after the tightening operation is completed. The hardening material HM used here is the same as the above. While tightening the male screw portion 51e of the first tightening member 51 into the female screw hole 52b of the second tightening member 52, both tightening members 51, 5
If vibration is applied by shaking 2 or the like, it is possible to promote the wraparound of the hardening material HM into the gap.

Further, in the above-mentioned embodiment, the straight rod having a straight shape is used as the connecting rod 30, but the connecting rod shown in FIG. 10 (A), FIG. 10 (B) or FIG. 10 (C) is used. If adopted, the adhesive force of the connecting rod 30 to concrete can be increased and the tensile strength thereof can be improved. Connecting rod 30 shown in FIG.
The reinforcing member 31 bent in a wave shape is joined along the length direction. The connecting rod 30 shown in FIG.
A plurality of rod-shaped reinforcing members 32 are joined in parallel at intervals in the length direction. The connecting rod 30 of FIG.
A plurality of rod-shaped reinforcing members 33 for the two connecting rods 30
Are joined in parallel at intervals in the length direction. Of course, the same effect can be expected by bending the connecting rod 30 itself to form a corrugated portion, an L-shaped portion, or the like.

Furthermore, in the above-described embodiment, the main bar 1
Although the internal rebar 10 is composed of 1, the stirrup bar 12 and the auxiliary bar 13, as shown in FIG. 11, a resin net 14 formed in a grid pattern or another pattern, a grid pattern or another pattern is formed. By interposing the wire mesh 15 knitted in step 2 between the main bar 11 and the connecting rod 30, the brittle resistance of the divided block itself can be increased. Further, the stress acting between the connecting rod 30 and the concrete to which it is attached at the time of connecting the blocks can be effectively dispersed by the resin net 14 and the metal net 15, and further effectively by the internal rebar 10. Can be dispersed. By the way, the wire mesh 1
5 may be connected to at least one of the internal rebar 10 and the connecting rod 30.

Hereinafter, an example of a coupler having a structure other than the above will be described with reference to FIGS.

The connector 60 shown in FIGS. 12 to 14 is a first connector.
The tightening member 61, the second tightening member 62, and one nut 63 attachable to the male screw portion 30a of the connecting rod 30 are included.

The first tightening member 61 is the connecting rod 30.
It has a female screw hole 61a corresponding to the male screw portion 30a in the center. In addition, the female screw hole 61 of the first tightening member 61
A nut-shaped portion 61b with which a tool (not shown) such as a wrench can be engaged is provided on the opening side of a. Further, a male screw portion 61c is provided on the outer surface of the first tightening member 61.

The second tightening member 62 is the connecting rod 30.
Insertion hole 62a having a diameter slightly larger than the outer diameter of
And a female screw hole 62b corresponding to the male screw portion 61c,
It has through the step 62c. Further, a nut-shaped portion 62d that can be engaged with a tool (not shown) such as a wrench is provided at the end of the second tightening member 62 on the insertion hole 62a side.

As can be seen from the drawing, both the male screw portion 61c of the first tightening member 61 and the female screw hole 62b of the second tightening member 62 of the connector 60 are right-handed threads. In addition, the nut 63 is used during tightening work described later.
In order to prevent the screw from loosening, the male thread portion 30a of the connecting rod 30 on the second tightening member 62 side has a left-hand thread. Of course, at least one of the threads of the male screw portion 30a of the connecting rod 30 is a right-hand thread, or
Even if the male screw portion 61c of the tightening member 61 and the screw thread of the female screw hole 62b of the second tightening member 62 are left-threaded, the desired block connection can be performed.

When the two divided blocks DB1 and DB2 are connected by the connecting device 60, first, as shown in FIG. 14, the connecting rod 3 of one divided block DB1 is connected.
The second tightening member 62 is covered on the outside of the exposed portion of 0,
The nut 63 is attached to the male screw portion 30a. Also,
The first tightening member 61 is attached to the male screw portion 30a of the connecting rod 30 of the other divided block DB2. still,
Depending on the relationship between the facing distance between the connecting rods 30 and the sizes of the components of the coupler 60 when the blocks are combined, this mounting operation may be performed after the blocks are combined, which will be described later.

By attaching a mark indicating the mounting position of the nut 63 and the second tightening member 62 to each male screw part 30a, the mounting position of the nut 63 and the second tightening member 62 to the male screw part 30a can be easily determined. . If an adhesive is applied to the inner surface of the nut 63 in advance, or if two nuts having a small thickness are used as the nut 63 and one nut is fixed to the other nut, the nut mounting position varies. Can be prevented.

Next, two divided blocks DB1 and DB2
So that the recesses 40 of the connecting rods are aligned with each other, in other words, the center lines CL of the connecting rods 30 of each other (see FIG. 14).
The packing (not shown) is sandwiched between them so that they match.

Next, the tightening members 61 and 62 attached to the connecting rods 30 facing each other are turned by fingertips,
The female screw hole 62b of the second tightening member 62 is lightly tightened on the male screw portion 61c of the first tightening member 61.

Next, the nut-shaped portion 61b of the first tightening member 61 and the nut-shaped portion 62d of the second tightening member 62.
When the tool is engaged with the first tightening member 61 and the second tightening member 62 is rotated while pressing the first tightening member 61, the male screw portion 61c of the first tightening member 61 is attached to the second screw member 61c.
The female screw hole 62b of the tightening member 62 is tightened. First
Since the pitch of the threads of the male screw portion 61c of the fastening member 61 is larger than the pitch of the threads of the male screw portion 30a of the connecting rod 30, only the first fastening member 61 is rotated while pressing the second fastening member 62. However, the same tightening work can be performed.

As the tightening proceeds, the nut 63 attached to the male screw portion 30a of the connecting rod 30 contacts the step 62c of the second tightening member 62. When the tightening is further continued after this, the connecting rods 30 are pulled in the direction of the arrow in FIG. 12, whereby the divided blocks DB1 and DB2 are pressed into contact with each other via the packing without a gap.

Since there is some play between the insertion hole 62a of the second tightening member 62 and the connecting rod 30, even if there is a deviation in the center lines CL of the connecting rods 30 that face each other, this deviation is used as the play. It can be absorbed by and can be properly connected.

Further, the male screw portion 6 of the first tightening member 61.
1c and the direction of the screw thread of the female screw hole 62b of the second tightening member 62 and the direction of the screw thread of the male screw portion 30a of the connecting rod 30 are different from each other.
The nut 63 attached to the male screw portion 30a of the connecting rod 30 does not loosen. Of course, as described above, the adhesive may be applied in advance to the inner surface of the nut 63 attached to the male screw portion 30a, or the nut 63 may be attached.
Even when two nuts having a small thickness are used and one nut is fixed to the other nut, the same loosening prevention effect as described above can be obtained.

The above-mentioned tightening work is performed in the divided block DB.
1 and the divided blocks DB2 continue until they come into pressure contact with each other through the packing under a predetermined pressure, whereby the two divided blocks DB1 and DB2 are firmly connected.

After the tightening work is completed, a hardening material (not shown) similar to the above is filled in each recess 40 and hardened. This prevents the connector 60 from loosening and improves the shear strength of the connecting portion. This completes a series of connecting operations.

Instead of the nut-shaped portion 61b of the first tightening member 61 and the nut-shaped portion 62d of the second tightening member 62, a toothed portion (rectangular grooves at equal intervals in the circumferential direction) as shown in FIG. Lined portions) 61d and 62e may be provided. In this case, the toothed portions 61d and 6
A tool having a protrusion that can be engaged with 2e is used as a tool.

Further, it is possible to prevent the connecting rod 30 and the two fastening members 61, 62 from being plastically deformed by an external force applied to the blocks after connection, and to maintain the connection strength, watertightness and airtightness of the blocks in good condition. Can adopt the method shown in FIG.

In the method shown in FIG. 16, two fixing nuts 64 are attached to each of the male screw portions 30a of the connecting rod 30 in advance, and after the tightening work of the first tightening member 61 and the second tightening member 62 is completed. Fixing nut 64
Is tightened to fix the first tightening member 61 and the second tightening member 62. Of course, even if the number of fixing nuts 64 is one, the same fixing can be performed. Although the description is omitted, the same effect can be obtained by adopting the same methods as those shown in FIGS. 8 and 9.

An example of a concrete block connection structure other than the beam block shown in FIG. 1 will be described below with reference to FIGS. In the drawing, a recess 40 for accommodating the coupler is shown.

FIG. 17 shows an example in which the present invention is applied to an underdrain block. This underdrain block is integrated by combining two divided blocks DB3 and DB4, which are divided and produced in advance, through a packing (not shown) and connecting them by a connector (not shown). There is. Each of the divided blocks DB3 and DB4 contains an internal rebar (not shown) assembled in a similar shape to each block. The recess 40 is formed in each divided block D.
Two pieces are provided on the outer side surfaces of the connecting ends of B3 and DB4 at intervals. The connecting rod (not shown) is embedded in the divided blocks DB3 and DB4 in a state of being joined or not joined to the internal reinforcing bar, and its male screw portion is exposed in the recess 40. Any one of the above-mentioned couplers is selectively used to connect the divided blocks DB3 and DB4. The method of block connection is the same as the method described above.

FIG. 18 shows an example in which the present invention is applied to an underdrain block. This underdrain block is integrated by combining four divided blocks DB5 to DB8, which are manufactured by dividing in advance, into a rectangular shape through a packing (not shown) and connecting them by a connector (not shown). ing. In each of the divided blocks DB5 to DB8,
Internal rebars (not shown) assembled in a similar shape to each block are built in. The recess 40 is formed in each divided block D.
Six pieces are provided at intervals on the outer side surfaces of the connection ends of B5 to DB8, and two pieces are provided on the inner side surface at intervals. In other words, the tensile strength is increased by increasing the number of recesses (the number of couplers) on the side where the tensile force acts in the underdrain block after the construction compared to the side where the compressive force acts. The connecting rod (not shown) is embedded in each of the divided blocks DB5 to DB8 in a state of being joined or not joined to the internal reinforcing bar, and its male screw portion is exposed in the recess 40. Any one of the above-described couplers is selectively used to connect the divided blocks DB5 to DB8. The method of block connection is the same as the method described above.

FIG. 19 shows an example in which the present invention is applied to a waterway block. This water channel block is integrated by combining three divided blocks DB9 to DB11, which are manufactured by dividing in advance, into a U shape through a packing (not shown) and connecting them by a connector (not shown). Has been done. Each of the divided blocks DB9 to DB11 has a built-in internal rebar (not shown) assembled in a similar shape to each block. Six recesses 40 are provided on the outer surface of the connection end of each of the divided blocks DB9 to DB11 at intervals, and two recesses 40 are provided on the inner surface at intervals. In other words, the tensile strength is increased by increasing the number of recesses (the number of couplers) on the side on which the tensile force acts in the constructed water channel block than on the side on which the compressive force acts. The connecting rods (not shown) are connected to or not connected to the internal reinforcing bars in the divided blocks DB9 to DB1.
1 is embedded inside, and the male screw part thereof is exposed in the recess 40. Any one of the above-described couplers is selectively used to connect the divided blocks DB9 to DB11. The method of block connection is the same as the method described above.

FIG. 20 shows an example in which the present invention is applied to a retaining wall block. In this retaining wall block, six divided blocks DB12 to DB16, which are produced by dividing in advance, are combined into a substantially L shape through a packing (not shown),
They are integrated by connecting them with a connector (not shown). Each divided block DB12 to DB
An internal rebar (not shown) assembled in a similar shape to each block is incorporated in the block 16. Six recesses 40 are provided on the outer surface of each of the divided blocks DB12 to DB16 at intervals, and four recesses 40 are provided on the inner surface at intervals. In other words, the tensile strength is increased by increasing the number of recesses (the number of couplers) on the side where the tensile force acts in the retaining wall block after the construction than the side where the compressive force acts. The connecting rod (not shown) is connected to the internal rebar or not connected to each divided block DB.
12 to DB16 are embedded inside, and the male screw part thereof is exposed in the recess 40. This divided block DB1
Any one of the above-mentioned couplers is selectively used for coupling 2 to DB16. The method of block connection is the same as the method described above.

FIG. 21 shows an example in which the present invention is applied to an underdrain block. This underdrain block is integrated by combining eight divided blocks DB17 to DB24, which are manufactured by dividing in advance, into a rectangular shape through a packing (not shown) and connecting them by a connector (not shown). ing. Each divided block DB17 to DB2
In FIG. 4, internal rebars (not shown) assembled in a similar shape to each block are built in. Three recesses 40 are provided at intervals on the outer side surfaces of the connection ends of the divided blocks DB17 to DB24, and two recesses 40 are provided on the inner side surface at intervals. In other words, the number of recesses (number of couplers) on the side where tensile force acts in the underdrain block after construction
To increase the tensile strength by increasing the pressure on the side where the compression force acts. The connecting rod (not shown) is connected to the internal rebar or is not connected to each divided block DB17.
It is embedded inside DB24, and the male screw part is exposed in the recessed part 40. This divided block DB 17-
Any one of the above-described couplers is selectively used for coupling the DB 24. The method of block connection is basically the same as the method described above, but here, the prestress method is adopted for block connection.

The prestressing method is a method whose main purpose is to cancel the stress generated by the load.
Here, the upper connected blocks (DB24, DB17, and DB18) and the lower connected blocks (DB22 and DB21)
And DB20), the compressive force is applied in advance to the inner surface side where the tensile force acts to increase the tensile strength. In order to apply a compressive force, a tubular material called a sheath, which is pre-embedded in each of the upper divided blocks (DB24, DB17, and DB18) and the lower divided blocks (DB22, DB21, and DB20). A wire or cable made of high-strength steel or the like (hereinafter, referred to as a tension material WM) is inserted through. And
By pulling and fixing both ends of the tension material WM after insertion using a tool having a nut or a taper, a compressive force is applied to the inner surface side of each of the upper coupling block and the lower coupling block.

[0071]

As described above in detail, according to the connector of the present invention, the first tightening member is connected to the first connecting member by screwing the non-penetrating female screw hole into the male screw portion of the tip of the first connecting rod. The second connecting rod is mounted on the rod, and the insertion hole is inserted into the male thread portion of the tip of the second connecting rod to cover the second connecting rod with the second tightening member and the second connecting rod after covering the second connecting rod with the second tightening member. The nut is attached to the second connecting rod by being screwed into the male screw portion of the tip of the first connecting block, and then the connecting surface of the first concrete block and the connecting surface of the second concrete block are combined so that the recesses of the first and second concrete blocks match each other. Each of the second tightening members covered by the second connecting rod is rotated, and its female screw hole is screwed into the outer male screw portion of each of the first tightening members attached to each first connecting rod and tightened. Thus, the second connecting rods of the connecting rods facing each other are pulled toward the first connecting rod via the nuts that come into contact with the steps of the second tightening member, and the first connecting rod is moved to the second connecting rod via the first tightening member. It is possible to keep the state in which the pulling force is applied in the direction of the connecting rod and a predetermined pulling force is applied, whereby the first and second concrete blocks can be firmly connected to each other in an appropriate pressure contact state.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which divided blocks are connected according to an embodiment of the present invention.

2 is a front view of FIG.

FIG. 3 is an enlarged vertical cross-sectional view of the coupler and its peripheral portion in FIG.

FIG. 4 is an exploded perspective view of the coupler shown in FIG.

FIG. 5 is an explanatory diagram of a method of connecting divided blocks.

6 is a perspective view showing a modification of the coupler shown in FIG.

7 is a longitudinal sectional view corresponding to FIG. 3, showing a modification of the coupler shown in FIG.

FIG. 8 is an explanatory view of a method of filling a hardener into the coupler.

FIG. 9 is an explanatory view of a method of filling a hardener in the coupler.

FIG. 10 is a perspective view showing a modification of the connecting rod shown in FIG.

11 is a perspective view showing a modification of the internal reinforcing bar shown in FIG.

FIG. 12 is a longitudinal sectional view corresponding to FIG. 3, showing another embodiment of the coupler.

13 is an exploded perspective view of the connector shown in FIG.

14 is an explanatory view of a method of connecting divided blocks by the connector shown in FIG.

15 is a perspective view showing a modification of the coupler shown in FIG.

16 is a longitudinal sectional view corresponding to FIG. 3, showing a modification of the coupler shown in FIG.

FIG. 17 is a perspective view showing another embodiment of the concrete block connection structure.

FIG. 18 is a perspective view showing another embodiment of the concrete block connection structure.

FIG. 19 is a perspective view showing another embodiment of the concrete block connection structure.

FIG. 20 is a perspective view showing another embodiment of the concrete block connection structure.

FIG. 21 is a perspective view showing another embodiment of the concrete block connection structure.

FIG. 22 is an explanatory diagram of a conventional block connecting method.

[Explanation of symbols]

DB1 to DB24 ... Divided blocks, 10 ... Internal reinforcing bars, 3
0 ... Connection rod, 30a ... Male screw part, 31 ... Corrugated reinforcing member, 32 ... Rod-shaped reinforcing member, 33 ... Rod-shaped reinforcing member, CL ...
Center line of connecting rod, 40 ... Recess, HM ... Curing material, 60
... coupler, 61 ... 1st tightening member, 61b ... nut-like part, 61c ... male screw part, 61d ... tooth ring-like part, 62 ...
2nd tightening member, 62b ... Female screw hole, 62d ... Nut-shaped part, 62e ... Tooth ring-shaped part, 64 ... Fixing nut.

Claims (4)

(57) [Claims] 1. A plurality of first connecting rods are embedded so that a plurality of recesses having openings on the connecting surface side and the side surface side are provided, and a male screw portion provided at a tip end is exposed in each of the recesses. And a plurality of concave portions having openings on the connecting surface side and the side surface side corresponding to the concave portions of the first concrete block, and the male screw portion provided at the tip is exposed in each concave portion. Is a connector used when interconnecting a second concrete block formed by embedding a plurality of second connecting rods such that the tip male screw portion of the first connecting rod is screwable. A first tightening which is attached to the first connecting rod by screwing a non-penetrating female screw hole into the distal male screw portion of the first connecting rod, which has a through female screw hole in the center and a male screw portion on the outer surface. Member and the An insertion hole having a diameter slightly larger than the outer diameter of the connecting rod is provided in the center, and a female screw hole that can be screwed into the outer male screw portion of the first tightening member is provided through a step between the insertion hole and the insertion hole. A second tightening member that covers the second connecting rod by inserting the insertion hole into the male screw portion of the second connecting rod, and a male end of the second connecting rod after covering the second connecting rod with the second tightening member. A nut that is attached to the second connecting rod by being screwed into the threaded portion, and limits the movement of the second tightening member in the direction toward the tip of the second connecting rod by contact with the step of the second tightening member in the state after attachment. A coupler comprising: 2. The end surface of the external tightening portion of the first tightening member and the end surface of the second tightening member in a state where the female screw hole of the second tightening member is screwed into the external screw thread part of the first tightening member. The coupling device according to claim 1, wherein annular flanges facing each other are provided. 3. A recess facing the tip of a second connecting rod to which a nut is attached is provided on the surface of the first tightening member opposite to the surface on which the non-penetrating female screw hole is formed. The connector according to claim 1 or 2. 4. The first tightening member and the second tightening member are engageable with a tool for tightening the female screw hole of the second tightening member by screwing the female screw hole of the second tightening member to the outer male screw portion of the first tightening member. Is provided, The connector according to any one of claims 1 to 3 characterized by things.