JP2618805B2 - Connecting method of multiple blocks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a plurality of concrete blocks, and is particularly suitable for connecting box culverts and the like.

[0002]

2. Description of the Related Art Conventionally, in the case of connecting a plurality of concrete blocks, as a means for bringing the end faces of the blocks into close contact with each other and joining them, an insertion hole is formed by using a sheath tube when molding each block. PC steel material is inserted through the insertion hole to connect the blocks together, and after the connection, a grout material such as expansive cement paste or mortar is injected into the gap formed between the insertion hole and the PC steel material to prevent corrosion of the PC steel material. It was common to fill voids. Further, instead of the sheath tube, a punching die is used to form the insertion hole.

[0003]

However, when the insertion hole is formed using the above-mentioned conventional sheath tube, there is a disadvantage that the cost is high and the workability is poor. Also, when the insertion hole is formed by using a punching die, since the inner surface of the insertion hole is made of concrete, when the grout material is injected, even if a grout material having a predetermined softness is injected, the concrete of the insertion hole is not removed. The water is absorbed from the surface, and the grout material gradually hardens as it advances to the back of the insertion hole, and it is difficult to fill the space between the PC steel material and the insertion hole with the grout material to the back. there were. For this reason, before injecting grout into the insertion hole, water is poured into the insertion hole in advance, the concrete surface of the insertion hole is sufficiently moistened, and then water is drained so that no water remains in the insertion hole. There is a problem that the grout material has to be injected afterwards and the operation is very difficult.

In view of such conventional drawbacks, the present invention eliminates the need for water injection work by adhering the waterproofing agent to the concrete surface of the insertion hole, and ensures that the grout material injected into the insertion hole does not become hard and the depth is ensured. An object of the present invention is to provide a method for connecting a plurality of blocks, which can be filled with grout material, which can reduce the cost and facilitate the work.

[0005]

To achieve the above object, the gist of the present invention is to form a through hole in a plurality of blocks made of concrete and insert a PC steel material into the through hole. In connecting the plurality of blocks, a waterproof agent is attached to the inner surface of the insertion hole, a PC steel material is inserted into the insertion hole, and after connecting the plurality of blocks, a grout material is inserted into a gap between the PC steel material and the insertion hole. A method of connecting a plurality of blocks is characterized by injecting, and the gist of the present invention according to claim 2 is to form a waterproof layer by painting or impregnating the concrete surface in the insertion hole with the waterproof agent. The connecting method of a plurality of blocks according to claim 1.

[0006]

According to the method for connecting a plurality of blocks according to the present invention, after a waterproofing agent is attached to the inner surface of the insertion hole formed in the plurality of blocks and the PC steel material is inserted into the insertion hole to connect the plurality of blocks, Since the grout is injected into the gap between the PC steel material and the insertion hole, the moisture of the grout is not absorbed from the concrete surface of the insertion hole, and the entire gap is reliably filled with the grout.

[0007]

Embodiments of the present invention will be described in detail with reference to the drawings, taking a case where a concrete block is a box culvert as an example. As shown in FIG. 1, the box culvert which is the target of the method for connecting a plurality of blocks according to this embodiment includes an A type block 1 and a B type block 2. As shown in FIG. It has a square cylindrical shape, and has an inclined inner surface 6 inclined at an angle of approximately 45 degrees between each adjacent horizontal inner surface 4 and vertical inner surface 5 when the end surface 3 is substantially vertical, and is near the four corners. Insertion holes 7 are formed at the respective positions. The connecting device 8 is provided only on the B-shaped block 2.

As shown in FIG. 3 (A), the A-shaped block 1 has an insertion hole 7 which penetrates between the end surfaces 3 and 3 while keeping a certain distance from the inclined inner surface 6. The B-type block 2 is shown in FIG.
As shown in FIG. 2B, a rectangular hole 10 is provided at a middle position between the inclined inner surfaces 6 and in which a box 9 (see FIG. 4) having an open surface along the inclined inner surface 6 is embedded. An insertion hole 7 penetrating between the surfaces 3 and 3 is formed, and as shown in FIG. 4, grid reinforcing bars 11 are embedded on both sides near the box body 9.

The insertion hole 7 is provided with a cutting die 12 as shown in FIG.
It is formed by using. That is, the insertion hole 7 is formed by embedding a die 12 made by inserting a steel pipe 14 into a soft vinyl chloride tube 13 having a length slightly longer than that of the blocks 1 and 2 when the blocks 1 are molded. Later first steel pipe 14
And then the tube 13 is extracted.

Examples of the waterproofing agent to be adhered to the concrete surface in each insertion hole 7 include a permeable water absorbing agent commercially available under the trade name “Tight Silane” manufactured by Toyo Ink Mfg. Co., Ltd.
Suitable are those marketed under the trade name "DEITAROL" manufactured by N).

Tight silane is a silane-based waterproofing agent, and when it is applied to an inorganic base material such as concrete, the alkoxysilane penetrates into the base material and reacts with the base material, and the surface layer has a thin thickness of angstrom level. Thus, a non-film-forming waterproof layer is formed, and has a function of not only preventing water absorption of the base material but also not reducing the air permeability. This waterproofing agent is highly durable due to high permeability, is not a hazardous substance because it is water-based and has no flash point, and can be easily attached even if the base material such as concrete is wet. Has characteristics.

As shown in FIG. 4, a connecting device for connecting a plurality of blocks includes a box body 9, an anchor plate 16 that abuts on the inner surface of the box body 9, a washer 17, and P.
The C steel material 18 is composed of nuts 21 and the like that are screwed into male screws 19 engraved on both ends. Anchor plate 1
6 is formed with an injection hole 16a penetrating from the side surface and inclined toward the insertion hole 7, and the grout material can be injected into the insertion hole 7 through the injection hole 16a. The length of the box body 9 is properly selected depending on the distance between the reinforcing bars embedded in the B-shaped block 2.

An example of a method for connecting a plurality of blocks according to the present invention will be described. Tight silane waterproofing agent is applied to the insertion holes 7 of the A-type block 1 and the B-type block 2 to be connected. This application is performed by impregnating a brush or sponge attached to the tip of the rod with a waterproofing agent, and thereby the entire concrete surface in the insertion hole 7.

As shown in FIG. 1, two A type blocks 1 and 1 are arranged in series between two B type blocks 2 and 2. Then, the PC steel material 18 is inserted into the insertion holes 7 at the four corners of each of the arranged blocks, and both ends thereof are projected into the corresponding rectangular holes 10 of the B-type block 2.

The anchor plate 16 and the washer 17 are arranged at each end of the PC steel material 18, the nuts 21 are screwed into the male screws 19, respectively, and the rotation of the nut 21 is advanced to give a predetermined tension force to the PC steel material 18. And two A each
The mold blocks 1 and 1 and the B blocks 2 and 2 are connected to each other.

The grouting material is injected into the space between the PC steel material 18 and the insertion hole 7 through the injection hole 16 a and is filled. At this time, since the waterproof layer made of the waterproof agent is formed on the concrete surface in the insertion hole 7, the grout material can be smoothly filled to the depth of the void without being absorbed by water.

Two A-type blocks 1, 1 and one B-type block 2 to be further connected are arranged in series at the end of the connected B-type block 2, and the above-mentioned steps (1) to (4) are performed. Hereinafter, the same operation is repeated to connect the blocks to the required length.

When the waterproof agent is applied to the insertion hole 7 with a brush or sponge as described above, when the grout material is injected into the insertion hole 7, the water content of the grout material is not absorbed by the concrete surface and the application is performed. Since the tool is inexpensive, the application operation is easy, and there is no need to inject water into the insertion hole 7, the filling operation of the grout material is also facilitated. Further, by forming the insertion holes 7 in a plurality of blocks by using a punching die, there is an advantage that the cost can be drastically reduced.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, it can be applied to concrete blocks other than box culverts.
As shown in, the A-type blocks 1 and the B-type blocks 2 may be alternately arranged in series, and three or more A-type blocks 1 may be arranged in series between two B-type blocks 2. Instead of using a brush or a sponge, a waterproofing agent may be sprayed into the through-hole 7 by spraying instead of using a brush or a sponge. Instead of a rectangular box, a hexagonal box 9 as shown in FIG. May be used.

[0020]

According to the first aspect of the present invention, the waterproofing agent is attached to the inner surface of the insertion hole formed in the plurality of blocks made of concrete, and the plurality of blocks are connected by inserting the PC steel material into the insertion hole. After that, by pouring the grout material into the space between the PC steel material and the insertion hole, instead of water injection, the waterproofing agent is attached to the concrete surface in the insertion hole, so that the grout material injected into the insertion hole does not become hard and the gap Thus, the grout material can be reliably filled to the back of the device, and there is an excellent effect that the cost can be reduced and the operation can be facilitated. Further, according to the second aspect of the present invention, by forming a waterproof layer on the concrete surface in the insertion hole with a waterproofing agent, it is possible to more reliably eliminate water absorption from the concrete surface in the insertion hole.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing an example of a method of connecting a plurality of blocks according to the present invention.

FIG. 2 is a perspective view showing a block according to the embodiment of the present invention.

3A and 3B are partial perspective views showing the A-type block and the B-type block according to an embodiment of the present invention in a cutaway manner.

FIG. 4 is a partially enlarged view showing a connection device for a connecting method of a plurality of blocks according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a punching die for forming an insertion hole according to the embodiment of the present invention.

FIG. 6 is a side view schematically showing another example of arrangement of blocks in the method of connecting a plurality of blocks according to the present invention.

FIG. 7 is a partially enlarged front sectional view showing a modified example of the connection device for the connection method according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 A type block (box culvert) 2 B type block (box culvert) 3 End surface 6 Inclined inner surface 7 Insertion hole 8 Connecting device 9 Box body 10 Rectangular hole 12 Cutting die 13 Tube (constituting a cutting die) 14 Steel pipe (cutting die) 16) Anchor plate 16a Injection hole 17 Washer 18 PC steel material 19 Male screw 21 Nut

Claims (2)

(57) [Claims] 1. A through hole is formed in a plurality of blocks made of concrete, and when connecting a plurality of blocks by inserting a PC steel material into the through hole, a waterproof agent is attached to an inner surface of the through hole, and a PC is inserted into the through hole. A method for connecting a plurality of blocks, comprising inserting a grout material into a gap between the PC steel material and the insertion hole after inserting the steel material and connecting the plurality of blocks. 2. The method for connecting a plurality of blocks according to claim 1, wherein a waterproof layer is formed by painting or impregnating the concrete surface in the insertion hole with the waterproof agent.