JPS61274087A - Chemical injector for shielding machine - 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 (Field of Industrial Application) The present invention relates to a shield machine equipped with a device for injecting a chemical solution onto soft ground.

(Prior art) Conventionally, when using a shield machine on soft ground, it is necessary to perform excavation work and ground hardening work separately.
There was a problem that the excavation efficiency was low.

(Problems to be Solved by the Invention) The present invention has been made in view of the above points, and its purpose is to inject chemical liquid into a shield machine that can harden the ground with chemical liquid while excavating. We are in the process of providing equipment.

(Means for Solving the Problems) The present invention provides a chemical liquid injection nozzle 1 on the outer periphery of the cutter head hood 2.
The drive shaft 4 for the cutter head is made hollow, and a chemical liquid pipe 7 is arranged inside this drive shaft 4.The tip of this chemical liquid pipe 7 is connected to the chemical liquid injection nozzle 1, and the base end 6 of the chemical liquid pipe 7 is connected to the chemical liquid. The gist of the shield machine is that it is connected to a supply hose 19.

(Example) Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

The shield machine A is formed by disposing a cutter head 2 on the front side of a machine body 1 as shown in FIG. It is composed of The canterfed drive shaft 4 is formed hollow, and a jet pipe 5 and a chemical liquid pipe 16 are disposed within the drive shaft 4. A drilling nozzle 3 is formed on the front surface of the cutter head 2, a chemical liquid injection nozzle 1 is formed on the outer periphery of the cutter head 2, and a jet path 10 and a chemical liquid path 1) are formed inside the cutter head 2. The tip of the jet pipe 5 is connected to the jet path 10, and the chemical liquid pipe 16 is connected to the chemical liquid path 1). On the other hand, Jie.

The base end of the jet tube 5 is connected to the jet supply hose 6, and the base end of the chemical liquid pipe 16 is connected to the chemical liquid supply hose 19.

FIG. 2 shows an enlarged half-sectional view of part A in FIG. Chemical solution introduction chamber 15 having a chemical solution introduction path 14
It is formed. A jet pipe 5 is led out from the jet water introduction chamber 15, and a chemical liquid pipe 16 is led out from the chemical liquid introduction chamber 15. Further, a jet water introduction hole 17 and a chemical solution introduction hole 18 are formed in the outer peripheral walls of the jet water introduction chamber 13 and the chemical solution introduction chamber 15, respectively, and the jet water introduction hole 17 and the chemical solution introduction hole 18 are connected through a so-called swivel structure. It communicates with the jet supply hose 6 and the chemical solution supply hose 19. That is, the outer cylinder 20 is loosely fitted to the drive shaft 4 so that the drive shaft 4 can rotate freely, and the outer cylinder 20 has a jet water supply hole 21 and a chemical solution supply hole 2.
2 are formed to correspond to the jet water introduction hole 17 and the chemical solution introduction hole 18, respectively. 23 is Patsukin,
24 is a bearing. Therefore, during excavation by rotation of the cutter head 2, the jet water J is injected from the jet supply hose 6 through the jet water introduction path 12 and the jet pipe 5 toward the stratum G from the excavation nozzle 3, and the excavation by the jet water is also carried out. The chemical solution is introduced into the chemical solution introduction path 1.
The chemical liquid is injected from the chemical liquid injection nozzle 25 onto the soft stratum G through the chemical liquid pipe 16. In addition, the vacuum 26 of the mud removal pipe 8
Sediment and jet water are collected from

Next, the injection of the chemical liquid will be explained in detail.

The chemical liquid is, for example, one liquid C and two liquids mixed together and sprayed onto the excavated surface. Examples of the chemical solution to be mixed include conventional ones such as sodium silicate and sulfuric acid, and chemical solution and cement. Of the chemical liquid pipes 7, 7a is a single liquid chemical liquid pipe,
Reference numeral 7b indicates a two-liquid chemical pipe, and therefore, the first liquid C and the second liquid are separately injected from the one-liquid injection nozzle 1a and the two-liquid injection nozzle 1b through separate channels. These liquid injection nozzles 1
As shown in FIG. 4, the two-liquid injection nozzle a and the two-liquid injection nozzle ib are arranged in close proximity to each other as a pair, and the injection direction of each nozzle is directed so that the chemical liquids are mixed approximately at the excavation surface. In the illustrated embodiment, four pairs are provided, but the number is not necessarily limited.

FIG. 5 shows an overall diagram of the excavation operation of the shield machine A. The shield machine A is set on the starting shaft B, and the press-fitting jack 27 is used to press the fume pipe 28 and the shield machine A to excavate and propel the machine. It is.

6 and 7 show another embodiment of the present invention intended for an auger type machine, in which a chemical liquid pipe 7 is disposed within a drive spin 29 which is a drive shaft 4 and an auger shaft 30, and a cutter The chemical liquid is sprayed from a chemical liquid injection nozzle 1 of a head (auger head) 2.

(Effects) As described above, the present invention provides a chemical liquid injection nozzle on the outer periphery of the cutter head, makes the drive shaft for the cutter head hollow, arranges a chemical liquid pipe inside this drive shaft, and uses the tip of this chemical liquid pipe to spray the chemical liquid. In addition to connecting to the nozzle, the proximal end of the chemical liquid pipe is connected to the chemical liquid supply hose, so that the chemical liquid can be injected from the cutter head through the chemical liquid supply hose and the drive shaft.
Therefore, it becomes possible to inject the chemical liquid from the chemical liquid injection nozzle while excavating with the cutter head, which has the effect of improving excavation efficiency.Also, since the chemical liquid can be injected at the tip of the excavation hole, the soft ground is gradually hardened as it is excavated. This has the effect of making it possible to perform excavation smoothly.

[Brief explanation of drawings]

1(a) and 1(b) are a side sectional view and a front view of the shield machine of the present invention, FIG. 2 is an enlarged half sectional view of part A in FIG. 1(a), and FIG. FIG. 4 is an explanatory diagram of the injection of the chemical liquid as above, FIG. 5 is a schematic diagram showing the excavation operation as above, FIG. 6 is a cutaway side view of another embodiment of the present invention,
FIG. 7 is an enlarged sectional view of the bottom portion of FIG. 6.

Claims (2)

[Claims] (1) A chemical spray nozzle is provided on the outer periphery of the cutter head,
The drive shaft for the cutter head is made hollow, and a chemical liquid pipe is placed inside this drive shaft.The tip of this chemical liquid pipe is connected to a chemical liquid injection nozzle, and the proximal end of the chemical liquid pipe is connected to a chemical liquid supply hose. Features a shield machine. (2) A patent in which the chemical liquid injection nozzle is composed of a one-liquid injection nozzle and a two-liquid injection nozzle, the one-liquid injection nozzle and the two-liquid injection nozzle are placed close to each other, and their injection directions intersect approximately at the excavation surface. A chemical liquid injection device for a shield machine according to claim 1.