JP2005048498A - Concrete placing-joint structure and concrete placing-joint method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete placing-joint structure and a concrete placing-joint method, in which an existing concrete section and a new concrete section are unified surely and the sectional performances of the existing concrete section and the new concrete section can be improved. <P>SOLUTION: In the concrete placing-joint structure, fillers X are interposed among the existing concrete section 1 and the new concrete sections 2 formed to the side and lower section of the existing concrete section 1 respectively. Injection pipes 3, which are piped along the side faces and base of the existing concrete section 1 and to which a plurality of holes are formed, are interposed among the existing concrete section 1 and the new concrete sections 2, and the fillers X are made to flow in the injection pipes 3. Confirming pipes 8 disposed in upright along the side faces of the existing concrete section 1 from the lower ends of the existing concrete section 1 are interposed among the side sections of the existing concrete section 1 and the new concrete sections 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a concrete transfer structure and a concrete transfer method in the case where a new concrete part is formed on the side and lower side of an existing concrete part.

  Today, there are various ways to transfer a new concrete part to an existing concrete part. For example, when reinforcing an existing footing, if the concrete part is to be expanded by winding the footing, it is necessary to integrate the existing footing and the additional part. In such a case, in order to integrate the existing footing and the extension part, there is a method of placing the extension part with high-fluidity concrete. This is a method of forming an extension using high fluidity concrete with excellent fluidity. According to this method, concrete is reliably filled even in places where the concrete is difficult to rotate. Can be placed without gaps.

In recent years, a method of interposing a filler (resin liquid) between an existing concrete part and a new concrete part has been provided. This is because the hose constructed by covering the mesh hose with the nonwoven fabric is placed on the joint surface of the existing concrete part, and after placing the new concrete part, the filler is sent into the hose, and the filler penetrates from the hose. This is a method of filling a gap formed between an existing concrete part and a new concrete part. According to this method, the existing concrete part and the new concrete part can be integrally formed via the filler (for example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 9-4230 (page 2-3, FIG. 2)

  However, in the former method using the conventional high-fluidity concrete, bleeding that occurs when a part of the mixed water is released due to sedimentation or separation of the solid material occurs, and the new concrete part in contact with the existing concrete part is fragile. There is a problem that the cross-sectional performance is significantly reduced due to the formation of layers and voids.

  In addition, in the latter conventional method of interposing the filler, it is difficult to confirm whether or not the filler has spread between the existing concrete part and the new concrete part, and in particular, the filler on the bottom surface of the existing concrete part. There is a problem that it is difficult to fill and confirm it.

  In the present invention, the above-described conventional problems are taken into consideration, and the existing concrete portion and the new concrete portion can be reliably integrated, and the cross-sectional performance of the existing concrete portion and the new concrete portion can be improved. An object is to provide a joining structure and a concrete joining method.

  The invention according to claim 1 is a concrete joint structure in which a filler is interposed between an existing concrete part and a new concrete part formed respectively on the side and below the existing concrete part. An injection pipe which is piped along the side surface and the bottom surface of the existing concrete part and has a plurality of holes is interposed between the new concrete part and the new concrete part, and the filler is contained in the injection pipe. It is circulated, and between the side part of the existing concrete part and the new concrete part, a confirmation pipe erected along the side surface of the existing concrete part from the lower end of the existing concrete part is interposed. It is a feature.

  According to a second aspect of the present invention, there is provided a concrete transfer method in which a filler is interposed between an existing concrete portion and a new concrete portion formed respectively on a side and a lower side of the existing concrete portion. Piping the injected pipe along the side surface and bottom surface of the existing concrete portion, piping a confirmation pipe extending upward from the lower end of the existing concrete portion along the side surface of the existing concrete portion, and And placing the new concrete part integrally with the confirmation pipe, and confirming that the filler is injected into the injection pipe until the filler rises in the confirmation pipe after the new concrete part is solidified. It is characterized by.

  Due to these features, the filler that circulates in the injection pipe penetrates between the existing concrete part and the new concrete part through the hole, and the penetrated filler spreads uniformly between the existing concrete part and the new concrete part, and the confirmation pipe It flows in from the lower end of and rises in the confirmation tube.

  According to the concrete transfer structure and the concrete transfer method according to the present invention, a plurality of holes are formed between the existing concrete portion and the new concrete portion along the side and bottom surfaces of the existing concrete portion. The filled injection pipe is interposed, the filler is circulated in the injection pipe, and it stands between the side of the existing concrete part and the new concrete part along the side of the existing concrete part from the lower end of the existing concrete part. Therefore, the filler that circulates in the injection pipe penetrates evenly between the existing concrete part and the new concrete part from the hole, and at this time, the filler flows from the lower end of the confirmation pipe and confirms. Ascend in the pipe. For this reason, it can be confirmed whether the filler has evenly penetrated by checking whether the filler has risen in the confirmation pipe, and the existing concrete portion and the new concrete portion are reliably integrated, And the cross-sectional performance of the newly installed concrete part can be improved.

  Hereinafter, embodiments of a concrete joining structure and a concrete joining method according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, in order to reinforce the existing reinforced concrete footing 1 that is the foundation of the structure, the new concrete part of the reinforced concrete structure is wound on the side and below the existing footing 1 so that the lower part of the existing footing 1 is rolled up. 2 is formed. Between the existing footing 1 and the new concrete part 2, an injection pipe 3 piped along the side surface and the bottom surface of the existing footing 1 is interposed, and a filler X made of a low-viscosity epoxy resin is placed in the injection pipe 3. Distributed.

  FIG. 2 is an enlarged perspective view showing the injection tube 3. As shown in FIG. 1 and FIG. 2, the injection tube 3 includes a horizontal tube 4 disposed along the bottom surface of the existing footing 1, and a lateral tube 4 disposed along the side surface of the existing footing 1. The two vertical tubes 5 are connected to each other. The horizontal tube 4 is bent in a U-shape, and both ends of the horizontal tube 4 are connected to the lower end of the vertical tube 5, respectively. The horizontal tube 4 is made of a mesh-like pipe, and a plurality of holes 6 through which the filler X penetrates are formed in the horizontal tube 4. The upper end of the vertical pipe 5 protrudes from the top end face of the new concrete part 2, and an injection port 7 for injecting the filler X is provided at the upper end of the vertical pipe 5. The injection port 7 is formed in a bowl shape whose diameter increases upward, and a check valve (not shown) that prevents the backflow of the filler X is provided in the injection port 7.

  In addition, a plurality of confirmation pipes 8 erected along the side surface of the existing footing 1 from the lower end of the existing footing 1 are interposed between the side portion of the existing footing 1 and the new concrete portion 2. The plurality of confirmation tubes 8 are respectively arranged at equal intervals between the two vertical tubes 5. The lower end of the confirmation pipe 8 communicates between the bottom of the existing footing 1 and the new concrete part 2, and the upper end protrudes from the top end surface of the new concrete part 2.

  Next, in order to reinforce the existing footing 1, a concrete joining method in which the new concrete portion 2 is integrally joined to the existing footing 1 will be described.

  As shown in FIG. 1, a space for excavating the surrounding footing 1 to provide a new concrete portion 2 is formed. At this time, in order to increase the adhesive force between the existing footing 1 and the new concrete part 2, the soil adhering to the existing footing 1 is washed away cleanly. Also, crushed stone (not shown) is laid on the bottom of the excavation, and discarded concrete (not shown) is placed on the crushed stone.

  Next, the injection pipe 3 in which the two vertical pipes 5 and the U-shaped horizontal pipe 4 are integrally formed is piped along the side surface and the bottom surface of the existing footing 1 and extended upward from the lower end of the existing footing 1. A plurality of existing check pipes 8 are piped between the two vertical pipes 5 along the side surface of the existing footing 1.

  Next, a reinforcing bar material (not shown) of the new concrete part 2 is arranged around the lower part of the existing footing 1, and a mold frame (not shown) of the new concrete part 2 is built around the reinforcing bar material. And concrete is cast in this formwork, and the new concrete part 2 is formed.

  Next, as shown in FIGS. 1 and 2, after a predetermined curing period, the mold (not shown) is removed and filled into the injection tube 3 from the injection port 7 formed at the upper end of the vertical tube 5. Material X is injected. The filler X flows through the vertical pipe 5 and flows into the horizontal pipe 4 from the lower end of the vertical pipe 5. The filler X flowing in the horizontal pipe 4 flows out from the plurality of holes 6 formed in the horizontal pipe 4 and penetrates uniformly into the gap formed between the bottom surface of the existing footing 1 and the new concrete part 2. To do. The filler X that permeates between the bottom surface of the existing footing 1 and the new concrete portion 2 flows into the confirmation pipe 8 from the lower end of the confirmation pipe 8 and rises in the confirmation pipe 8.

  The injection of the filler X is continued until the filler X rises in the confirmation tube 8. It is determined whether or not the filler X has risen in the confirmation pipe 8. When the filler X rises, it is determined that the filler X is uniformly filled between the bottom surface of the existing footing 1 and the new concrete portion 2. Stop the injection. Then, after the filler X is solidified, the existing footing 1 and the new concrete portion 2 are backfilled.

  According to the concrete joining structure and the concrete joining method having the above-described structure, a plurality of holes are provided between the existing footing 1 and the new concrete part 2 along the side and bottom surfaces of the existing footing 1. 6 is formed, the filler X is circulated in the injection pipe 3, and the existing footing from the lower end of the existing footing 1 is provided between the side of the existing footing 1 and the new concrete part 2. Since the confirmation pipe 8 erected along the side surface of 1 is interposed, the filler X flowing through the injection pipe 3 penetrates evenly between the existing footing 1 and the new concrete part 2 from the hole 6, At this time, the filler X flows in from the lower end of the confirmation tube 8 and rises in the confirmation tube 8. For this reason, it can be confirmed whether or not the filler X has permeated uniformly by whether or not the filler X has risen in the confirmation pipe 8, and the existing footing 1 and the newly installed concrete portion 2 are reliably integrated. Thus, the cross-sectional performance of the existing footing 1 and the new concrete portion 2 can be improved.

  The embodiments of the concrete joining structure and the concrete joining method according to the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention. It is. For example, in the above-described embodiment, the case where the new concrete portion 2 is formed so as to wind the lower portion of the existing footing 1 is described. However, the present invention is not limited to the existing footing 1, The present invention may be applied to a joint between an existing concrete part and a new concrete part.

  In the above-described embodiment, the injection tube 3 is composed of the two vertical tubes 5 and the U-shaped horizontal tube 4. However, in the present invention, the vertical tube 5 may be a single unit, Alternatively, a lattice-like horizontal tube 4 may be used. In the above-described embodiment, the horizontal tube 4 and the vertical tube 5 are integrally formed. However, the horizontal tube 4 and the vertical tube 5 may be detachable for easy storage and carrying-in. . Furthermore, in the above-described embodiment, the horizontal pipe 4 uses a mesh-shaped pipe to form the hole 6, but the present invention may form a hole by making a plurality of cuts in the horizontal pipe, A non-woven fabric may be wound around the horizontal tube.

It is a whole perspective view for demonstrating embodiment of the concrete joint structure and concrete joint method which concern on this invention. It is a fragmentary perspective view for demonstrating embodiment of the concrete joining structure and concrete joining method which concern on this invention.

Explanation of symbols

1 Existing footing (existing concrete part)
2 New concrete section 3 Injection pipe 6 Hole 8 Confirmation pipe X Filling material

Claims (2)

In the concrete joint structure in which a filler is interposed between the existing concrete part and the new concrete part formed respectively on the side and below the existing concrete part,
Between the existing concrete part and the new concrete part, there is interposed an injection pipe that is piped along the side surface and the bottom surface of the existing concrete part and in which a plurality of holes are formed. A filler is circulated, and between the side part of the existing concrete part and the new concrete part, there is a confirmation pipe erected along the side of the existing concrete part from the lower end of the existing concrete part. Concrete splicing structure characterized by having In a concrete joining method in which a filler is interposed between an existing concrete part and a new concrete part formed respectively on the side and below the existing concrete part,
In addition to piping the injection pipe formed with a plurality of holes along the side surface and the bottom surface of the existing concrete portion, a confirmation pipe extending upward from the lower end of the existing concrete portion is piped along the side surface of the existing concrete portion. The new concrete part is cast integrally with the injection pipe and the confirmation pipe, and after the solidification of the new concrete part, the filler is injected into the injection pipe until the filler rises in the confirmation pipe. A concrete joining method characterized by that.

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