JPS608395B2 - Thrust protection method for pipelines - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a thrust protection method for pipelines, and more particularly, to a thrust protection method for pipelines to prevent movement due to thrust loads applied to bent portions of pipelines buried in the soil. .

When laying a secondary pipe, as shown in Figure 1, bend pipe A.
It is widely practiced to connect the tubes C using.

By the way, in such a bent part of a pipe, a thrust load is applied to the apex P of the bent pipe due to the fluid pressure of the internal fluid in proportion to the inner diameter of the pipe and the intersection angle of the bent part, and this causes the pipe line to move in the direction of arrow R.
It is known that the phenomenon of movement in the direction occurs.

In the case of a curved pipe, this thrust load W (k9) is
If the intersection angle of the pipe is 8, the fluid water pressure is P (kg/2), and the pipe diameter is D (c), it can be found by W group co-op n. If it is lk9/no, the thrust load W is W side: 2×1X
Cowskin Sin ≠ 1-1 ID2, if Kanryu D = 50c, W = 2775kg, if Kanryu 100 skin, W = 11
100k9, and a considerable load will be applied to the bent portion.

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 cast to surround the bent part, and the thrust load W was counteracted by the resistance of the hardened concrete mass due to its own weight. Ta.

By the way, when using the above-mentioned method, the thrust load increases in proportion to the square of the pipe diameter, so as the pipe diameter becomes larger, the amount of concrete material must be rapidly increased, and in the case of large-diameter pipes, the work However, since such a huge amount of concrete members itself is quite heavy, it is necessary to take other measures to prevent it from sinking due to its own weight, especially on soft ground. In some cases, quite large-scale foundation work was required, and the installation of the curved pipes had the disadvantage of being quite troublesome.

In view of the above-mentioned drawbacks, this invention was made with the purpose of providing a thrust protection method that can easily and quickly perform thrust protection on curved pipes. This method is characterized in that the pile body and the band body wound around both ends of the bent pipe are firmly connected and fastened by driving the pile body.

Next, the present invention will be explained with reference to examples.

FIG. 2 shows a plan view of an embodiment of the invention.

In the pipeline thrust protection method of the present invention, a curved pipe 2A of a pipeline 2 is
A pile body 3 is driven onto the bisector M of the bending angle a, preferably at a position almost perpendicular to the straight edges of both ends 2A', 2A' of the curved pipe 2A, and the pile body 3 and the curved pipe Both ends 2 of 2A
It is constructed by firmly connecting band bodies 4, 4 wound around A, 2A with wires (or band irons) 5, 5. As the above embodiment, both ends of the curved pipe 2A,
When connecting and tying 2A and the pile body 3 firmly, use the wire 15.
, 5 is shown, but the present invention is not limited to this, and for example, an iron rod or a chain may be used to tie the lotus. Also, as shown in FIGS. 3A and 3B, the band body 4 ', 4' may be formed in advance integrally with the connection/closing portion villages 5', 5'.

In addition, in the above embodiment, when the pile body 3 is driven into soft ground, the driving depth or the thickness of the pile body can be adjusted as appropriate depending on the degree of softness of the ground, and can be calculated in advance. Depending on the magnitude of the thrust load, a material having appropriate strength such as concrete pile or steel pole is used as the material for the antibody 3.

Since this invention is configured as described above, even if a thrust load W is applied to the curved pipe 2A portion of the conduit, the pile body 3 and both ends of the pile body 3 and the curved pipe 2A can be connected to each other. Since the thrust load W is supported by the resistance force V in cooperation with the wire 5, the bent pipe does not move in the direction of the arrow R.

In the above embodiment, the case of a buried pipe is shown, but it goes without saying that the present invention can be similarly implemented in piping work on the surface of the earth. In addition, if the curved pipe 2A has a certain degree of elasticity, such as a PVC pipe, or if there is a risk that the curved pipe 2A will bend or deform due to the thrust load W, As shown in FIG. 4, a band body 4 is wound around the outer periphery of the joint part 2B and tightened to prevent the joint part from coming off. One or more antibodies 3' are implanted inside on the bisector M, and a band body 4 is wound around each of these into a curved tube.
', 4' can be firmly connected and fastened, or as shown in FIG. , 4 may be configured to be firmly connected to the pile body 3.

As described above, this invention is a means of counteracting the thrust load in a curved pipe of a conduit by directly applying the thrust load, instead of relying on the own weight of the concrete mass as in the past, or indirect means such as ivy. Since the structure is designed to resist the
When implementing this method, there is no need to prepare or pour a large amount of concrete as in the past, and it has various effects such as significantly shortening the construction period, especially on soft ground. It is.

[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. 3A and FIG. 3B are side views of main points of another embodiment of the present invention, 4 and 5 are plan views of other embodiments. 2...Pipe line, 2A...Bent pipe, 2A'...Both ends of bent pipe, 3...Pile body, 4...Band body, 5.
...Wire, W...Thrust load. Genoshio? Figure 2 (Figure 3) Closing side ``8J ?4■ Figure 5

Claims (1)

[Claims] 1. A method for thrust protection of pipelines, which comprises driving a pile body on the bisector of a bending angle of a curved pipe, and firmly connecting and tying the pile body to a band body wound around both ends of the curved pipe.