JPS637496A - Shielding excavator for gravel - 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> The present invention relates to a shield excavator for sandy and gravel ground in shield construction methods and propulsion construction methods.

<Conventional technology> Conventionally, the propulsion technology for a shield excavator for excavating earth and gravel with a lot of gravel and cobbles in the face soil is to mix mud shaving material and taken-in earth and gravel in the bulkhead behind the excavation plate, and mix it with the front face earth and sand. A shield excavator generates opposing ± pressure and uses ribbon screws attached to the bulkhead to transport the earth and gravel to a trolley behind the shield machine, or excavates while preventing the collapse of the front face earth and sand using mud water pressure. A shield excavator is used in which a gravel crushing device is installed in the muddy water shield excavator to crush the gravel taken in from the excavation plate into small pieces and transport the muddy water through a pipe.

<Problems to be Solved by the Invention> In the shield excavator for earth and gravel according to the prior art, the first construction method is a construction method in which the taken-in line segment is transported without crushing it, and the ribbon screw capacity is limited to the outside diameter of the shield machine. 115 of
If gravel larger than planned is mixed in, it may become jammed inside the screw.
We are spending a lot of time and money on countermeasures. In addition, in the second method, if the face soil contains viscous silt, clay, etc., the filter in the gravel crushing equipment often becomes clogged and blocked, making it impossible to drain mud backwards. be.

As mentioned above, the current situation is that there is no shield excavator for gravel that can reliably perform construction.

Means and action for solving the problem> In order to carry out construction work on gravel and cobblestone ground, there is a method of taking the gravel and cobblestones in the face ground into the intake chamber and then crushing them or transporting them in their original shape. As mentioned above, in the method of conveying the gravel in its original form, there is a limit to the wire diameter, and there are problems such as clogging and jamming of the conveyor, so in this method, the gravel taken into the intake chamber is crushed. As a method, a plurality of elliptical or star-shaped plates are sequentially made smaller at a constant ratio from the bulkhead side toward the face, and then a gravel crushing tool with different cross-sectional slopes for the major and minor axes is used. Since the intake chamber space changes even in the same cross section, gravel and boulders are taken in at the larger short axis side of the space, and crushed by the rotation of the crushing tool at the narrower space on the long axis side. Since the intake space becomes progressively narrower toward the bulkhead, we created a mechanism in which the gravel and boulders are crushed into smaller pieces and sent toward the bulkhead.

Embodiment An embodiment of the present invention is shown in FIGS. 1, 2, 3 and 4.
It is shown in the figure and will be explained in detail.

A rotary cutting plate 2 having a cutting blade 8 and a plurality of intake ports 4 for taking in earth and gravel is attached to the tip of the shield excavator 1, and an intake chamber 5 consisting of the rotary excavating plate 2 and a partition wall 8 is provided behind it, Inside the intake chamber 5, a partition wall 8 is provided with an elliptical or star-shaped plate.
A plurality of gravel crushing tools 7 with different cross-sectional slopes of the long and short axes are made concentrically with the rotating shaft 9 of the rotary cutting plate 2 by joining together a plurality of pieces that are gradually smaller in size at a constant ratio from the side toward the face. The mechanism is capable of independent forward and reverse rotation.

Further, inside the shell 6 in the intake chamber 5, ring-shaped plates are joined by sequentially shifting from the face side to the partition wall 8 side at regular intervals to create a step, and the thickness of the shell 6 becomes thicker toward the partition wall 8 side. regular,
The structure is such that the space inside the intake chamber 5 is gradually narrowed from the face side toward the partition wall 8 side.

A mechanism is provided at the lower end of the partition wall 8 with a conveyor 11 for transporting gravel and earth crushed in the intake chamber 5 to the rear of the shielding machine 1.

When the shield excavator 1 is propelled while rotating the tip rotary cutting plate 2 by the drive machine 13, the face earth and gravel are transported into the intake chamber in the shield excavator 1 through the plurality of intake ports 4 provided on the cutting plate 2. It will be incorporated into 5. The earth and gravel taken into the intake chamber 5 are stored in the intake chamber 5, and are sequentially sent out to the bulkhead 8 side as the shield excavator 1 is propelled. The rotation of the crushing tool 7 takes in the large part of the intake space on the short axis side, and the rotation of the crushing tool 7 from the short axis side to the long axis side crushes it to the size of the long axis and the intake space of the shell 6. . As it advances toward the bulkhead 8, the long and short axes and the space between the shells 6 are gradually narrowed, and the gravel is crushed into smaller pieces. Near the bulkhead 8, the gravel is crushed to a predetermined size and crushed together with earth and sand. The shielding machine 1 is transported to the rear by a conveyor 11 attached to the lower end of the partition wall 8.

In addition, if the strength of the gravel or boulder to be crushed is high, the rotation of the crushing tool 7 can be reversed and the crushing can be carried out by repeated forward and reverse rotations.

In this way, the shield excavator 1 can be propelled while reliably crushing the gravel and boulders of the rock face to a predetermined size.

<Effects of the Invention> As described above, the mechanism of the gravel shield excavator of the present invention is as follows:
Because it has a simple and strong structure consisting of a crushing tool and a shell,
There were no troubles such as breakdowns during excavation, allowing efficient construction and shortening the construction period. In addition, since the shield machine is designed to be strong and simple, the manufacturing cost of the shield machine is economical compared to conventional shield machines, and the operation of the shield machine does not require a skilled operator.

[Brief explanation of the drawing]

FIG. 1 is an explanatory longitudinal cross-sectional view of a shield excavator for gravel showing one embodiment of the present invention. FIG. 2 is a front explanatory view of the rotary excavation plate. FIG. 3 is a front explanatory view of the oval gravel crusher. Figure 4 shows
Front explanatory view of the star-shaped gravel crusher. In addition, 10 in the figure is the rotating shaft of the rotary excavation plate. 12 is a drive machine that rotates the gravel crushing tool. 13 is a drive machine that rotates the rotary excavation plate. 14 is a drive machine that rotates the conveyor. 15 is the direction correction jack for the shield machine. 16 indicates a trailing pipe of the shield machine. Figure j σ Figure 2 γ Figure 3 B Figure 4

Claims (1)

[Claims] A rotary excavation plate 2 having a cutting blade 3 and a plurality of intake ports 4 for taking in earth and gravel is attached to the tip of the shield excavator 1, and an intake chamber 5 consisting of the excavation plate 2 and a partition wall 8 is provided behind it,
On the inside of the shell 6 in the intake chamber 5, circular plates are sequentially joined at regular intervals from the face side toward the partition wall 8 to form a step, and the wall thickness of the shell 6 is made thicker toward the partition wall 8 side. Furthermore, a plurality of elliptical or star-shaped plates made smaller in a fixed ratio from the partition wall 8 side toward the face are joined together to rotate the gravel crushing tool 7 with different cross-sectional slopes in the major axis and minor axis directions. type drilling board 2
It is characterized by being able to rotate forward and backward independently concentrically with the rotating shaft 9 of the partition wall 8, and provided with a conveyor 11 at the lower end of the partition wall 8 for conveying crushed gravel and earth and sand crushed and stored in the intake chamber 5 to the rear. A shield excavator for gravel.