JPS6375293A - Pit expanding excavator - Google Patents

Abstract

(57) [Abstract] 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 hole-expanding drilling device for drilling a large-diameter hole in hard rock, a cobblestone layer, a gravel layer, or the like.

<Conventional technology> After a small-diameter pilot pipe is propelled in advance from the starting shaft to the destination shaft, a large-diameter drilling device is attached to the tip of this pilot pipe, and the pilot is propelled from the reaching shaft side toward the starting shaft. There is a method of burying the propulsion pipe while excavating a hole with a larger diameter than the pipe.

The hole-expanding drilling equipment used in the above-mentioned method consists of a funnel-shaped hollow cylindrical body, and a large number of drilling chips, which are the drilling means, are protruded from the surface facing the drilling direction. It is designed to be able to drill holes with a diameter larger than that of the pipe.

Problems to be Solved by the Present Invention> The above-described enlarged hole drilling technique has the following problems.

(b) If the excavation ground is hard rock such as cobblestones or boulders,
The tips are subject to severe wear and breakage easily, making excavation work extremely difficult.

As a result, excavation efficiency tends to decrease and construction periods tend to become longer.

(b) If it is determined that it is impossible to excavate the rock, the planned line must be changed, which requires a great deal of time and expense.

OBJECTS OF THE INVENTION The present invention was made in view of the above problems, and an object of the present invention is to provide a hole-expanding drilling device that can efficiently and reliably drill an enlarged hole even in hard rock.

Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

Kui〉Configuration of hole expansion drilling equipment An example of the hole-expanding drilling device 1 is shown in Fig. 1.2.

This hole-expanding drilling equipment consists of a funnel-shaped bottomed main body 2, an earth removal means installed in the main body 2, and an excavating means provided on an inclined surface 21 of the main body 2.

The bottom surface 22 of the main body 2 is formed in a closed manner, and one or more intake ports 23 for taking in excavated earth and sand are opened in the inclined surface 21 facing the other bottom surface 22.

Then, the main body 2 is fixed to the tip of the pilot pipe 3 with the inclined surface 21 facing the direction of excavating the enlarged hole.

Therefore, along with the rotation of the pilot pipe 3, the hole-expanding drilling device 1 rotates together.

Furthermore, a swivel 24 that is not affected by the rotation of the main body 2 is formed on the bottom surface 22 side of the main body 2.

<Examination> Excavation means As the excavation means of the hole-expanding drilling device 1, a roller cutter 4 is used.
use.

This roller cutter 4 is an excavating tool formed by carving a large number of cutter groups on the outer periphery of a cylinder, as shown in FIG. 1.2.

This roller cutter 4 is arranged on the inclined surface 21 of the main body 2 at a position avoiding the intake port 23, and is rotatably fixed and attached between brackets 25 protruding from the inclined surface 21.

Although the overall length, position, and number of roller cutters 4 vary depending on the excavation diameter of the enlarged hole, the number of roller cutters 4 is set so that the entire surface of the inclined surface 21 can be excavated when the main body 2 is rotated.

In this embodiment, a case will be described in which four roller cutters 4 are provided at positions equidistant from the center of the main body 2.

(c) One side of the pilot pipe 3 is connected to the axial center position of the soil removal means main body 2 from the inclined surface 21 side.

A screw auger 5 is inserted into the pilot pipe 3, and the screw auger 5 is exposed inside the main body 2.

The excavated earth and sand excavated by the roller cutter 4 are introduced into the main body 2 through the inlet 23, and then transferred to the base end side of the pilot pipe 30 by the screw auger 5 to be discharged.

Next, a method for drilling an enlarged hole will be explained.

(1) Drilling of pilot hole (Figure 3) First, drill a pilot hole along the planned line.

To drill a pilot hole, for example, a rotary propulsion eM6 is installed on the starting shaft A side, a multi-drill 7 and a pilot pipe 8 are set, and drilling is performed.

When drilling the pilot hole, even if there are boulders in the excavated ground, the multi-drill 7 can easily crush and penetrate them.
Excavation can be carried out along the planned line.

The excavation work is proceeded while sequentially connecting the pilot pipe 3 containing the screw auger 5, and the excavation is carried out to the reaching shaft B.

(2) To install the hole-expanding drilling device, once a pilot hole penetrating to the reaching shaft B is opened, the pilot pipe 8 at the tip of the pilot pipe 3 is removed and the hole-expanding drilling device 1 is replaced.

(3) Excavation of enlarged hole (Figure 4) Operate the rotary excavator 6 on the starting shaft A side to pull the pie back to the starting shaft A side.

As a result, each roller cage 1 vine 4 revolves around its axis and sequentially excavates the unexcavated portion around the pilot pipe 3.

The excavated earth and sand is taken into the main body 2 from the intake port 23 in parallel with the excavation work, and then transferred by the screw auger 5 and discharged to the starting shaft A side.

Even if rock such as boulders is present on the way, the roller cutter 4 cuts the hard rock with high efficiency to excavate an enlarged hole.

In parallel with the drilling work of the hole-expanding drilling device 1, while the laying water such as the humid pipe, the pipe 9 is brought into contact with the swivel 24 on the bottom surface 22 side of the main body 2, and is propelled from the reaching shaft B to the starting shaft A. Extend.

While repeating the extension of the laid main pipe 9 and the recovery of the pilot pipe 3, an enlarged hole is excavated until the starting shaft A is reached.

Other Examples If the diameter of the expanded hole to be drilled is large, it is also possible to install a plurality of roller cutters 4 at different distances from the axis of the hole-expanding drilling device 1 for drilling.

In the case of this embodiment, it is necessary to arrange the roller cutters 4 at positions where their rotation loci complement each other so that the entire surface of the slope 21 can be excavated.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

(a) With the conventional chipping method, it was extremely difficult to dig through hard ground such as boulders and boulders.

However, by using a roller cutter as the excavation means, even hard rock can be reliably and efficiently excavated, so it is not impossible to excavate an enlarged hole.

(b) By appropriately selecting the number and location of roller cutters, highly efficient excavation can be achieved.

[Brief explanation of the drawing]

Figure 1: An explanatory diagram of the longitudinal section of the hole-expanding drilling equipment. Figure 2: A cross-sectional view taken along ■-■ in Figure 1. Figure 3: An explanatory diagram when the pilot pipe is propelled. Figure 4: When drilling an enlarged hole. Explanatory diagram 1 day・′

Claims (1)

[Scope of Claims] A hole-expanding drilling device connected to the tip of a pilot pipe propelled from a starting shaft to an arrival shaft, comprising: a funnel-shaped bottomed cylinder having a larger diameter than the pilot pipe; A hole-expanding drilling device is constructed by opening an intake port on the sloped surface of the bottomed cylinder, rotatably attaching a roller cutter to the sloped surface of the bottomed cylinder, and guiding a screw auger into the bottomed cylinder from the pilot pipe side.