JPH0124191Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connector for connecting buried pipes cut by boring.

Gravity-type concrete raising dams, which are formed by pouring a large amount of concrete (e.g. 200,000 m ³ ) into the embankment of an old dam, have more underground piping than normal new dams, especially cleaning pipes for cooling water, and the need to connect the bedrock and concrete. Various types of piping are buried, such as contact pipes for tight contact with the surface, and joint pipes for integrating the new and old levee joints.
Under these conditions, various types of boring work are carried out, such as curtain boring for foundation treatment, consolidating boring, and core boring for concrete strength testing, and the total length of boring is also large. These borings
To determine the location, we refer to various piping diagrams in advance to determine the exact location where the pipes will be buried.

However, in reality, the buried position may move from the drawing position due to vibrations or other factors during concrete pouring, or errors may occur in boring, so it is difficult to cut the buried pipe during boring. There was something I ended up doing. Moreover, if boring is required at a particularly designated location, even though there is a certain possibility of hitting a buried pipe, the buried pipe will naturally be cut.

For this reason, conventionally, when cutting a buried pipe, the cut buried pipe P
A method is used to connect Pa and Pa by inserting a pipe 6 having a smaller diameter than this pipe. However, this connection method has the disadvantage that it becomes difficult to connect if the cut point is deep in the embankment body, and if the pipes P and Pa are misaligned, connection cannot be achieved. Another method is to connect the buried pipes P and Pa by forming a cavity 7 at the cut point as shown in FIG. In other words, the mortar is poured into the borehole B to the bottom of the cut point of the buried pipes P and Pa.
M ₁ is filled with mortar M 1 , and the bore hole is sealed with, for example, a disk 8 above the cut point, and the bore hole above it is filled with mortar M ₂ to form a cavity 7 at the cut point. . However, according to this method, mortar filling must be carried out in two parts, one for the lower part of the borehole B and the other for the upper part, which takes time and effort. When the borehole B is horizontal and facing upward, there is a drawback that it is difficult to form a cavity.

The worst possible method is to bury the cut portion, but if the buried pipe is, for example, a joint pipe, the quality of the cut portion may deteriorate.

The aim of the invention is to eliminate all the above-mentioned drawbacks by connecting cut and buried pipes with a spool-like connector.

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

1 and 2, a connecting tool 1 for cutting and burying pipes according to the present invention is a pincushion-shaped connecting tool consisting of a cylindrical body 2 and collar portions 3, 3 provided on the outer periphery of both ends of the cylindrical body. That is, the cylindrical body 2 is made of a steel pipe, and its outer diameter is shorter than the inner diameter of the borehole B bored in the embankment body T. Therefore, the outer periphery of the cylinder 2 and the borehole B
A gap 4 is formed between the inner wall and the inner wall. This gap becomes a passage that connects the cut buried pipes P and Pa. Therefore, if the buried pipe is a cooling pipe, the gap passage 4 must be large enough to allow cooling water to flow through it.

In addition, the outer diameter of the collar portions 3, 3 is approximately the same as the inner diameter of the borehole B, and the outer circumferential edge of the collar portions 3, 3 is in pressure contact with the inner wall of the borehole, sealing the inside of the gap passage 4 and filling the borehole. This prevents the mortar M from flowing into this passage. In order to more effectively prevent this inflow of mortar, elastic sealing materials 5, 5 are attached to the outer peripheral edges of the flanges 3, 3 as shown in the figure, and the flanges are connected to the borehole B via this sealing material. It is desirable to compact the inner wall of the

Next, the operation of connecting cut and buried pipes using the connector 1 will be explained. For example, if the hole diameter is 210mm,
A 10m horizontal boring was carried out, and at a depth of 5m,
Assume that a cooling pipe with a diameter of 25 mm is cut.
Therefore, first, if the connector 1 is inserted into the borehole B and installed at the cutting location, the buried pipes P and Pa will face each other with the cylindrical body 2 in between. As a result, both pipes P and Pa are brought into communication through the gap passage 4 around the outer periphery of the cylinder. This communication is confirmed by passing cooling water through one pipe P. Once it is confirmed that the connector 1 is in the correct position, the bore hole B is filled with mortar M to close the hole. At this time, the mortar M passes through the cylinder 2 and is filled into the borehole B over its entire length to a depth of 10 m (see Fig. 1). As a result, the buried pipes P and Pa are connected by the connector 1 as shown in Fig. 2, and the cooling water flows from one pipe P to the other pipe Pa by detouring through the gap passage 4 as shown by the arrow. do.

Furthermore, as shown in FIG. 3, even if the buried pipes P and Pa cut to the left and right across the borehole B are misaligned, the gap passage 4 on the outer periphery of the cylindrical body 2 of the connector 1 is The pipes are connected to each other so that cooling water can flow in the direction of the arrow, thus making it possible to connect buried pipes.

Furthermore, even if the diameter of the borehole is shorter than the diameter of the buried pipe, it is possible to connect the cut points. In other words, in Figures 4 and 5, a borehole Ba with a short diameter is inserted into a buried pipe Pc with a long diameter.
is passed through, and a connector 1 longer than the pipe diameter is inserted into this penetrating part.
a is installed, and the cylindrical body 2a is connected to the ribs 3a, 3a.
The gap passage 4a on the outer periphery of the groove is sealed. Therefore, the cooling water flows smoothly due to the presence of the gap passage 4a as shown by the arrow. Mortar M also passes through the cylinder 2a and is filled over the entire length of the borehole Ba.

As explained above, according to the present invention, buried pipes can be connected even at deep places where they are cut, and even if the positions of the buried pipes cut to the left and right across the bore hole are shifted, the pipes can be connected by the gap passage. can do. Furthermore, since the collar can seal the gap passage, pipes can be connected even if the boring direction of the borehole is vertical, horizontal, or upward. Furthermore, since the mortar can pass through the cylinder, the mortar filling operation only needs to be completed once instead of twice as in the conventional method, which saves time and effort. In addition, the connection can be made without burying the cut portion of the buried pipe, and the quality of the connection portion can be improved.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view showing the installation state, Figure 2 is a cross-sectional view taken along the line shown in Figure 1, Figure 3 is a cross-sectional view showing the connection state of buried pipes that are misaligned, and Figure 4 is a boring hole with a short hole diameter. FIG. 5 is an enlarged cross-sectional view taken along the lines of FIG. 4, FIG. 6 is a front view showing the connected state of conventional buried pipes, and FIG. It is a sectional view showing a connected state of still another conventional buried pipe. 1, 1a... Connector, 2, 2a... Cylindrical body, 3,
3a...Brim part, 4, 4a...Gap passage, B,
Ba...Borehole, M...Mortar, P,
Pa, Pb, Pc... Buried pipe, T... Embankment body.

Claims (1)

[Claims for Utility Model Registration] 1. A connector for connecting cut and buried pipes located on the left and right sides of a borehole, which can be inserted into the borehole and which connects the outer periphery and the inner wall of the borehole. A cut-and-buried pipe consisting of a hollow cylindrical body forming a gap passage therebetween, and a ring-shaped collar part provided on both outer peripheries of the cylindrical body and abutting against the inner wall of the borehole to seal the gap passage. Connector. 2. A connector for a cut and buried pipe according to claim 1, wherein the outer peripheral edge of the collar is covered with an elastic sealing material.