JPS5894598A - Level drilling method and drill guide used therein - 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 The present invention relates to a method for excavating shafts, mainly in urban areas, which enables vibration-free excavation without using blasting, and a structure of a drilling guide used therein.

Underground passages, subway tunnels, underground sewers in urban areas,
Underground Cape A/) It is extremely difficult to excavate tunnels such as tunnels, underground shafts such as utility poles, etc. by blasting in order to reduce the impact on buildings such as buildings and houses, and to reduce the risk of harm to the human body. Yes, and in the case of drilling or blasting, many cracks appear on the walls of the excavation road, and it is often difficult to excavate without installing concrete lining or shoring.

The present invention was developed as a result of various studies regarding vibration-free excavation as an alternative to conventional excavation by blasting, and is based on excavation by repeated drilling, cracking, and crushing. More specifically, the shape of the tunnel is extracted from the excavated surface of a shaft such as a tunnel or a shaft by a series of multiple drill holes, and the IJ/7 is also drilled at appropriate locations within the small section surrounded by the series of drill holes. The method is characterized in that a rock splitter, breaker, or expansion agent is inserted into the hole to crack and crush each of the small sections for excavation. Here, a large number of consecutive drill holes are performed while sequentially shifting the tri-μ drilling positions, but it is extremely difficult in terms of drilling technology to make adjacent holes consecutive without any interruption. Therefore, a continuous perforation body is easily formed. They also developed a drill hole guide that serves as an attachment for this purpose.

Hereinafter, the present invention will be explained specifically and in detail with reference to the drawings.

FIG. 1 is a front view showing the tunnel excavation surface, FIG. 2 is a side view of the drilling guide, and FIG. 3 is a plan view thereof.

As is clear from the figure, a series of outer circumferential perforations (2) are formed along the outer circumference (1) of the excavated surface of the tunnel using the IJ ff to create a tunnel shape, and then one hole is placed inside the excavated tunnel.
As shown in the figure, the tunnel is divided into several sections with a series of cross-shaped internal drilling holes (3), or in this case, it is divided into four sections to form small sections (4). A free surface is formed in the small section (4) in series with the perforation (3). Subsequently, one to several independent perforations (5) are formed within the small section (4). For drilling, it is preferable to use, for example, a down-the-hold 1Nor using empty sword pressure.
9 holes of 00-3000 wM are possible.

Peripheral drilling along the outer periphery of the tunnel excavation surface (1) (2) The continuity of 1 can be partially omitted due to reasons such as when there is a weak part on the excavation surface, so it is not strictly necessary such as #1. 2. The continuity of the internal perforations (3) intersecting each other in a cross shape is important in forming the above-mentioned free surface.For this purpose, the perforation guide shown in Figs. 2 and 3 is used. The main body of the drilling guide is a long pipe αB having a circular concave portion (2) and a perfectly circular drill guide IJ provided at the base of the circular concave portion (2). The long pipe has a thickness and length that allows it to be inserted into the previously drilled hole, and the guide ring must have an inner diameter slightly larger than the drill diameter and be large enough to allow the drill to pass through.

During drilling, if the guide ring moves, the stability will be poor, so we provided several holes for inserting detents in the long vibrator Q11, and hydraulically inserted the detents outward from the holes. Hoist α makes the long pipe stick out 0υ
is fixed, the position of the guide ring (to) is stabilized, and the drilling work is completed above the desk. Next, the cracking work is started using the free surface of the small section (4) divided by the drilling continuum.

In the cracking operation, internal pressure is applied to the above-mentioned independent perforations (5) to generate cracks in each small section. As for how to apply internal pressure, known methods can be used, such as a method of physically pushing outward from the inside of the hole, and a method of using expansion pressure caused by a chemical reaction. For the former physical method, a hydraulic lock splitter is suitable, and a breaker can also be used. In the former case, insert the wedge set part of the locking nubrator into the inside of the independent hole,
The wedge is pushed out by a hydraulic cylinder with a force of about 50 tons, and more than 10 times that force is applied to the inner surface of the independent perforation (5), causing cracks to form. Further, in the chemical method, as an expanding agent, for example, the trade name "Plystar", which is made of an inorganic compound mainly consisting of a special silicate and a special organic compound, can be used. Such cracking work is necessary when the rock is hard, but when it is soft, a method of crushing it using a breaker from the vicinity of the free surface of the small section (4) can be immediately adopted.

The cracked parcels are then subjected to crushing operations. Crushing is easy because it is a normal method using a drilling machine or breaker.

The length of one excavation using this method is close to the initial drilling depth, usually 1500 to 6000 sI+. After the destruction is complete, do IJA again along the outer periphery of the excavated surface (1) of the tunnel.
/ to form a continuum of outer peripheral perforations (2), then a continuum of internal perforations (3) to form a small section (4) with a free surface around it, and an independent perforation (5) inside thereof. Then, cracks are created in the small section (4) using a hydraulic lock splitter, etc., and then the cracks are crushed and removed using a drilling machine, etc., and the process is repeated one after another. Therefore, since the construction method does not use blasting, there is no vibration, there is little danger, and there are no cracks in the excavated surface.
Excellent effects such as eliminating the need for concrete lining or shoring can be obtained.

The present method will be explained in more detail below with reference to Examples.

Example 1 This construction method was used in construction to erect a concrete utility pole on top of granite rock.

The diameter of the vertical hole was 0.2.57 ff, and a drill with a total length of 3 m and a diameter of 114 dah was used. Using the drilling guide shown in Figure 2, 8 holes were made to form a continuous series of holes on the periphery. Ta. Next, an independent bore hole with a diameter of 45 mm was formed in the center, and the rock was split with a hydraulic rock nut (total length: 450 m), and the rock was broken down with a breaker to a depth of 2.5 m. The required time was approximately 2 hours to complete the drilling, approximately 40 minutes to break the cracks, and the above-mentioned shaft was completed in less than 3 hours.

This construction method allows for the creation of deep pits, so less concrete is needed to wrap the poles, and the poles can be erected more stably.

Conventionally, a breaker was used from the beginning, and the diameter was approximately 1
It was a hole about 1 meter deep and supported by a large amount of concrete.

Example 2 The woodworking method was applied to the rock excavation of a human tunnel of 2.2 m in height, 2.4 m in width, and about 60 m in length as shown in FIG.

Two down-the-hole drills are mounted on a caterpillar truck, and a pilot bit with a total length of 3000111 and an LCy reamer is used in conjunction with the reamer rotation diameter of 212 m as shown in Figures 2 and 3.
Using the perforation guide shown in the figure, outer peripheral perforations and cross-shaped internal perforations were sequentially performed to divide the specimen into four small sections, each forming a confession surface.

Next, 1 to 3 locations of 100su*, 15
Make an independent hole of 00 sm and insert a wedge diameter of 951 into this.
1,000m long hydraulic breaking machine (Picker HB)
B-1000 (manufactured by Yamamoto Iron Works Co., Ltd.) was inserted to generate a crack, which was then crushed and excavated using a drilling machine. The excavation speed using this construction method was approximately 48 hours per Fi3ff.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the tunnel excavation surface, FIG. 2 is a side view of the drilling guide, and FIG. 6 is a plan view. (1) Outer circumference of excavated surface of tunnel (2) Perimeter drilling (3
) Internal perforation (4) Small section (5) Independent perforation αυ Long vibrator ■ Arc-shaped concave part a] Guide ring α fathom Rotation bar - Through hole 09 Rotation prevention par αd Hydraulic hoist or more Applicant Yamagai Lock Co., Ltd. Industrial agent patent attorney Hirozo Mori %2 diagram

Claims (1)

[Scope of Claims] 1. A free surface is formed by a series of multiple drill holes on the excavation surface of a mine shaft such as a tunnel or a shaft, and appropriate portions are also drilled at appropriate locations within the small section surrounded by the series of drill holes. A method for excavating a tunnel, characterized in that a rock splitter, breaker, or expansion agent is inserted into the hole and destructive excavation is carried out in each of the small sections. 2. In order to form a continuous drilling body, a long pipe with a circular concave portion and a drilling guide with a drill guide ring provided at the base of the circular concave portion are used, and the long pipe of the boring guide is 2. The method for excavating a tunnel according to claim 1, wherein the drill is inserted into the drilled hole and the drill is inserted through the guide ring. 3. A long pipe with an arc-shaped recess, a perfectly circular drill guide ring provided at the base of the arc-shaped recess, holes for inserting detent bars at several places in the long pipe, and detent bars. A drilling guide for tunnel excavation, characterized by comprising a hydraulic or pneumatic hoist that projects from a long pipe into the drilling soil.