JPH0333831Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is designed to prevent damage to pipes due to point touching (point support) and narrow bearing area during horizontal and vertical curve construction in promotion works such as sewer construction and tunnel construction. This relates to the structure of the propulsion tube that distributes the load.

Currently, when constructing sewer pipes in urban areas, there are many examples in which the propulsion method is adopted in order to prevent road traffic conditions and noise and vibration in nearby residential areas when laying sewer pipes under roads. It is certainly expected that the number will increase.

Conventionally, the propulsion method has been adopted where shafts can be constructed in a straight line, and curved sections, although theoretically possible, have various problems in actual construction, and have been constructed using shield methods, etc. However, with the shield construction method, there is a limit to the minimum diameter, so even if the pipe diameter is larger than the designed diameter and becomes over-designed, it has no choice but to be ignored for construction reasons. However, in the current era of low economic growth, where public investment is expected to reach a zero ceiling, it is a social imperative to optimize construction work through appropriate construction based on appropriate design.

Therefore, in the case of medium- and small-diameter pipe installation, long-distance and curve propulsion using the propulsion method is becoming an unavoidable issue.

The first problem when constructing curves using the propulsion method is
As shown in the figure, in the curved portion, there is an opening on the outer side A of the propulsion tube. Unless a camber or the like is inserted into this opening and the opening is held in place, the curve as designed cannot be constructed. Also, if the inner part B remains as it is, due to the nature of the pipe, it will only come into contact at one point as shown in Figure 2, so if it continues to be propelled, the destruction of the B part will be certain. It would be possible to install cambers around the entire circumference of the pipe, but this would require a great deal of effort and management, and all the cambers would have to follow the distance between each pipe to completely maintain the bearing pressure. It is questionable whether it is doing its job in response to the situation. Therefore, with a camber of about 4 to 6 points,
The reality is that there is a gap between each. In this case, the bearing pressure area of the camber at these 4 to 6 points is:
There is a natural limit, and the thrust is limited by the destructive load due to the concentrated bearing pressure area.
The situation is such that it is necessary to install a vertical shaft or use the intermediate push method. Furthermore, when the camber is not working evenly, the pipes are destroyed, and there are cases in which water leaks occur due to the labor involved in repairing or incomplete repair.

In view of the above-mentioned current situation, the present invention is aimed at a propulsion tube that can effectively distribute the load. The main feature is a hume tube that incorporates a thrust pressure receiving member 4 having a dispersion surface 3.

The thrust pressure receiving member 4 having the pressure receiving surface 2 and the dispersion surface 3 is made of a pair of bearing plates or bearing blocks having high rigidity, for example, made of steel, and is installed inside the propulsion tube 1 (1 to 4 points).
embedded. Of course, the area of the pressure receiving surface 2 is smaller than the area of the dispersion surface 3 as shown in FIGS. 4, 5, and 7.
As shown in FIG. In the figure, numeral 5 indicates a camber, 6 a through hole for reinforcing adhesion, 7 a projection, and 8 a groove.

Therefore, as shown in Fig. 1, in a propulsion tube 1 that is curved horizontally and propelled into the ground by jacks in the direction of arrow a, at the curved position, the thrust (propulsive load) is concentrated at position B. The pressure receiving surface 2 receives the concentrated load. And that force is dispersion plane 3
It is transmitted to the propulsion tube 1 itself in a dispersed state.

Therefore, the end face B portion of the propulsion tube 1 can handle a large thrust, and the conventional thrust limit can be greatly expanded.
It is possible to prevent the tube 1 from breaking and enable long-distance curve propulsion.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the underground curve propulsion state by the Huyum tube of the present invention, Figure 2 is a front view of the thrust concentration part, Figure 3 is a perspective view of the Huyum tube, and Figure 4 is its side view. Fig. 5 is a perspective view of another embodiment of the same Huum's canal, Fig. 6 is a partial cross-sectional view thereof, Fig. 7 is a side view of another embodiment of the Huum's canal, and Fig. 8 is another example of the Huum's canal. FIG. 9 is a side view of another embodiment of the tube. 1... Propulsion tube, 2... Thrust pressure receiving surface, 3... Thrust dispersion surface, 4... Thrust pressure receiving member.

Claims (1)

[Claims for Utility Model Registration] (1) A hume tube comprising a thrust pressure receiving member 4 having a thrust pressure receiving surface 2 at the end of a propulsion tube 1 and having a thrust dispersion surface 3 connected to the surface 2. (2) The hume tube according to claim 1, wherein the thrust pressure receiving member 4 having the pressure receiving surface 2 and the dispersion surface 3 is made of steel.