JPS6311794A - Method of gravel crushing shield construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] In the construction work of constructing a conduit in the ground containing gravel and cobblestones by the propulsion method or the shield method, excavation is carried out while crushing the gravel and cobblestones in front of the cutting edge. It is related to construction methods.

[Conventional technology]

Conventionally, when excavating in ground that contains a lot of gravel and cobbles using the propulsion method or the shield method, there are two methods: attaching a powerful bit or roller bit to a rotary excavation plate;
Alternatively, a common method is to take gravel and boulders into a shield excavator and then crush them with a crusher. However, all of these methods are expensive as they require an expensive bit and a powerful motor that powerfully rotates the rotary excavation plate.On the other hand, the method of crushing the debris after taking it into the shield machine eliminates the possibility of debris getting caught on the tip of the cutting edge. It is difficult to take in all the cobblestones, and furthermore, the direction of excavation changes rapidly due to the gravel and cobblestones, making it difficult to propel excavation in a predetermined direction.

[Problem that the invention seeks to solve]

In the present invention, when directly crushing gravel or boulders that are caught in the cutting edge in the direction of propulsive excavation with a cutting edge having a strong cutting edge without using a rotary excavation plate, can be done without causing
To provide a shield construction method that completely crushes gravel and boulders that get in the way with a very small thrust and reliably propels excavation into gravel ground.

[Means and actions for solving the problem] A cutting edge 2 having a strong cutting edge 1 and equipped with the necessary number of reinforcing cross-spars 3 is pressed against the gravel 5 in the ground using a hydraulic jack 4 for crushing gravel. If the fracture 5 cannot be crushed with a pressure that does not cause deviation in the propulsion excavation direction, 700~2. By injecting the necessary ultra-high pressure water of OOOkg/cm' or more and forming fracture lines or weakening 7 on gravel and cobbles, with a relatively small thrust,
This can be crushed. In this way, even if the gravel or cobblestone 5 hits any part of the cutting edge 1 of the cutting edge 2 and tries to eccentrically move, the gravel or cobblestone will be crushed and excavated without changing the direction. be able to.

〔Example〕

One embodiment of the present invention is shown in FIG. 1, FIG. 2, and FIG. 3, and will be specifically described.

Hydraulic pressure at the required pressure is sent from the hydraulic hose 9 to the ultra-high pressure water generation booster 8 to generate ultra-high pressure water, and the ultra-high pressure water is sent to the canting edge 1 of the cutting edge 2 and, if necessary, through the ultra-high pressure water supply pipe 10. Water is supplied to an ultra-high pressure water injection port 6 provided in the crossbar 3 to be reinforced. The ultra-high pressure water injection port 6 has
An ultra-high-pressure water injection nozzle 11 usually made of sapphire or the like is attached to the rear end, and when the ultra-high-pressure water injection nozzle 11 crushes gravel and cobblestones 5 with the cutting edge 2, the ultra-high pressure is applied so that they do not come into direct contact and break. It is installed offset to the rear of the water injection port 6. In this way, the hydraulic jack 4 applies a thrust to crush the gravel and boulders 5 to the cutting edge 2 while injecting ultra-high pressure water. In this case, the gravel and cobblestones 5 first form a fracture line or weakening line 7 by the jetting force of ultra-high pressure water, so the gravel and cobblestones 5 are crushed by the progress of crushing with the comparatively small cutting edge 2. [Void] Crushed gravel and boulders are taken into the shield machine from 2.

〔Effect of the invention〕

The crushing of gravel and cobblestones according to the present invention uses ultra-high pressure water jetting power,
The crushing force of the cutting edge and the crossbar crushes at the position of the cutting edge, making it possible to crush gravel and cobbles that were caught in the tip of the cutting edge, which was difficult to do with conventional technology. The eccentric force exerted on the shield machine due to the crushing resistance of the shield machine has almost disappeared, and there is no deviation in the propulsion direction even when the shield machine is propelled and excavated while crushing gravel and boulders.

In addition, since the fracture line or weakening 7 is formed by the jetting force of ultra-high pressure water, the crushing thrust at the cutting edge is extremely small, and the structure of the cutting edge is also better than when crushing is done simply by the crushing thrust as in the past. It is also significantly lighter and simpler.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional explanatory diagram of a gravel crushing shield method showing one embodiment of the present invention. FIG. 2 is an explanatory diagram showing the tip of the shield machine, and FIG. 3 is a detailed explanatory diagram showing the cutting edge and the process of crushing gravel and cobblestones. Note that 13 in the figure indicates a bulkhead of the shield machine.

Claims (1)

[Claims] A nozzle that sprays ultra-high pressure water is attached to the cutting edge at the tip of the cutting edge, which has a strong cutting edge and a crossbar to reinforce it if necessary. When the cutting edge at the tip of the blade is pressed from behind with a hydraulic jack to crush the gravel, ultra-high pressure water is sprayed from a spray nozzle attached to the cutting edge that is pressed against the gravel and cobbles, forming a fractured surface and crushing the gravel. , a gravel crushing shield method for crushing boulders.