JPS608394B2 - Thrust protection method for pipelines - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thrust protection method for pipelines, and more specifically, to prevent movement of pipelines buried in the ground due to thrust loads applied to bent portions (or branched portions) of the pipeline. Regarding thrust protection method.

Conventionally, when laying a pipe, a curved pipe A is used as shown in Figure 1.
Alternatively, it is widely practiced to connect the tubes C using a T-shaped tube B or the like. By the way, at such bent or branched portions of the pipe, the inner diameter of the pipe increases due to the fluid pressure of the internal fluid.
It is known that a thrust load is applied to the apex P of the curved pipe in proportion to the crossing angle of the bent portion, causing a phenomenon in which the pipe moves in the direction of arrow R.

In the case of a curved pipe, this thrust load W (k9) is determined by W = The cow D2Sin can be found by, for example, the intersection angle of the curved pipe is 8=9, and the fluid water pressure lk
9', the thrust load is W, etc. = 2 x 1 will be subject to a considerable load.

As a result, the bent portion of the pipe moves in the direction of arrow R in Figure 1, causing an accident in which the joints in the vicinity, such as the joints between bent pipes A and A and pipe C, come loose and come loose. There is.

Therefore, in the past, in order to prevent the pipe from moving and the joint from coming off due to such thrust loads, concrete E was poured to surround the curved pipe (or T-shaped pipe), and the thrust load W was suppressed by the reaction force due to the hardened concrete mass's own weight. I was trying to make them compete.

By the way, when using the above-mentioned method, the thrust load increases in proportion to the power of the pipe diameter, so the larger the diameter, the more rapidly the amount of concrete material must be increased, and in the case of large pot pipes, the work It has the drawback that it is a big deal, and
Since such a huge amount of concrete members weighs a considerable amount, separate measures must be taken to prevent them from sinking due to their own weight, and if the ground is particularly soft, it may be necessary to carry out quite large-scale foundation work. However, there was a drawback that the arrangement of bent pipes (or T-shaped pipes) was quite troublesome.

In view of the above-mentioned drawbacks, the present invention has been made for the purpose of providing a thrust protection method that can easily and quickly perform thrust protection on bent pipes (or T-shaped pipes). A support member having an L-shaped cross section, consisting of a side plate applied to the outer surface of the tube and a substrate that receives the bent tube (or T-shaped tube) from below, was driven into the lower part of the bent tube (or T-shaped tube). Fix it to the pile body and place a bent pipe (
or a T-shaped tube) is fixed to the clover layer. Next, the present invention will be explained using examples.

FIG. 2 is a plan view of an embodiment of the present invention, and FIG. 3 is a sectional view taken along line mm in FIG. 2.

The thrust protection method of this invention is to drive an appropriate number of piles 2...2 (Fig. 3) into the bottom of the pipe excavated in advance for laying the pipe. A supporting member 4 having an L-shaped cross section, consisting of a side plate 4A applied to the side surface and a substrate 4B for receiving the bent pipe from below, is fixed, and the bent pipe 3A is placed on the substrate 4B of the supporting member 4, and the bent pipe 3A is applied to the side plate 4A. This is how we record the war calendar. Further, the number of pile bodies 2 . . . 2 that support the support member 4 is increased as appropriate, or the driving depth is adjusted depending on the degree of softness of the ground.

The support member 4 in the above embodiment is preferably one in which the side plate 4A applied to the outer surface of the curved pipe and the base plate 48 are integrally formed of reinforced concrete or the like, but the base plate 4B and the side plate 4A are connected by an angle member (not shown) or the like. It is also possible to have a configuration in which

Although the above-mentioned embodiment shows the case of a curved pipe that is bent in a substantially planar direction, the present invention can be similarly implemented even for a curved pipe that is bent with a vertical component as shown in FIG. In this case, since the thrust load W acts in a direction having a vertical component, thrust protection can be achieved more completely if the antibodies 2...2 are also brought to a position where they support the side plates 4A.

Since this invention is configured as described above, the thrust load at the bend (or branch) of the pipe is reduced to the pile body 2.
...2 and is effectively received by the cooperation of the side plate 4A and the board 4B, so there is no chance that the bent part (or branch part) will move due to thrust load, and according to the present invention, thrust protection is achieved. With the construction method, it is possible to prepare the support members 4 by forming them in advance, so there is no need to worry about pouring a large amount of concrete and waiting for it to harden, as in the past, and the pile bodies can be driven. After that, the piping work can be completed by simply fixing the supporting members to the pile body and then fixing the bed section directly, so the construction period can be significantly shortened, and it has various effects such as being easy to perform. .

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is a plan view of an embodiment of the present invention, Fig. 3 is a sectional view taken along the line m-m in Fig. 2, and Fig. 4 is a sectional view of another embodiment. be. 2...Pile body 3...Pipeline, 3A...
Bent pipe, 4...Support village, 4A...Side plate, 4B...
·substrate. 7 side? 2 sardine finished figure? 4 Sardines

Claims (1)

[Claims] 1. A support member having an L-shaped cross section, consisting of a side plate applied to the outer surface of the bent portion (or branched portion) and a substrate that receives the bent portion or branched portion from below, is attached to a pile body driven below the bent portion. A thrust protection construction method for a conduit, characterized in that the bent portion or the branched portion is placed and fixed on the substrate.