JPH03140591A - Excavation of rockbed and guide frame therefor - Google Patents

Abstract

PURPOSE:To prevent the bending of pit excavated as well as form a given free face by a method in which a guide bar is inserted into a preceding pit excavated in a rockbed, and connecting pits are excavated at both sides of the preceding pit through the guide bar to form blocks partitioned by the grooves. CONSTITUTION:Planned positions of a preceding excavated pit 1 and connecting pits 2 are marked on a rocked, and a given number of preceding pits 1 are formed. A guide bar 4 is inserted into the preceding pits 1, a guide frame 5 is attached to hold a rod 6, and a rock drill machine 9 is set on a guide shell 8 to excavated connecting pits 2 through a centralizer 10. Excavation is made while easing striking forced to the upper guide frame 5 by springs 12 inserted into the upper part of the parent and child bits 11 to form blocks partitioned by grooves 3 formed by the pits 2 to secure a free face. Blocks with wide grooves can be formed, and the deep pits having high verticalness can be constructed with high accuracy.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention is a method for accurately drilling follow-up holes and constructing trenches in order to secure the free surface necessary when excavating rock using a non-burst method. Regarding equipment and construction methods.

``Conventional technology'' When performing rock excavation for vertical shafts in urban areas using non-blasting methods, drilling using breakers, etc., drilling using large-diameter drilling machines, continuous hole drilling machines, etc., large-scale hydraulic crushing machines, static drilling machines, etc. However, in such urban areas, this often occurs in narrow spaces adjacent to human residences, which poses problems in terms of noise, vibration, work space, work efficiency, and construction accuracy. Because of the large number of workers involved, inefficient work that relies heavily on human labor is being carried out.

``Problems to be Solved by the Invention'' With the recent development and practical use of tunnel boring machines, plans are increasingly being made to construct urban sewer pipes in rock formations in some regions.

In addition, excavation of vertical shafts for starting and reaching tunnel boring machines is increasingly carried out by occupying roads with a width of about 4 m to 6 m.

For this reason, there is an urgent need for a construction method that makes it easy to bring in excavation equipment and work inside the shaft, and that also has low vibrations, low noise, and high construction efficiency and precision.

When excavating a rock shaft, ensuring a free surface is essential for improving work efficiency, and the present invention accurately drills a throttle hole to form a predetermined free surface.

The biggest problem in drilling a throttle hole is to perform a prescribed drilling without causing hole bending, and the present invention provides a device for suppressing this hole bending and a construction method using this device. The purpose is to

"Means for Solving the Problems" In order to achieve the above objects and solve the problems, the means of the present invention are shown below.

Mortar, concrete, etc. are spread flat on the rock where the trench is to be drilled, and the positions of the pre-drilling and drawing holes planned prior to drilling are measured and marked on this.

Predetermined pre-drilled holes are drilled every second hole according to the markings, and then a guide rod is inserted into the pre-drilled holes, and this guide rod is held at the center of the guide rod.

Each side of this guide rod has the function of holding a rock drilling machine lot, so using the guide rod as a guide, 20 lots were driven to a predetermined position adjacent to both sides of the preliminary drilling. ,
It is possible to accurately drill a throttle hole while preventing hole bending.

"Operation" As mentioned above, in the groove drilled by the throttle hole, the throttle hole must be continuous and a free surface must be ensured.

The purpose of laying flat mortar and concrete on the rock where the hole is to be formed is to ensure accurate positioning and improve the efficiency of the drilling process.

Further, the reason why the preliminary holes are drilled every second hole is to drill holes while measuring the accurate hole position vertically.

A guide rod with an appropriate margin is inserted into the pre-drilled hole that was previously drilled, and the guide frame that holds this guide rod is used to hold the lower end of the lot of the rock drill to be drilled. Guided drilling operations can maintain a satisfactory drilling interval, prevent hole bending, and form deep drawn holes.

``Example'' An example will be described with reference to the drawings. Figure 1 shows a planned layout of the throttle hole 2 in a rock vertical shaft, and Figure 2 shows a detailed Mi diagram of the groove 3.

Prior to shaft excavation, mortar, concrete, etc. are spread evenly on the bedrock, and the planned positions of the preliminary drilling hole 1 and the throttle hole 2 are marked.

A predetermined number of pre-drilled holes 1 are drilled, and then throttle holes 2 are simultaneously drilled on both sides of the pre-drilled holes 1, and as shown in FIG. Create a block.

Each drilled hole is planned and placed in contact with the circumference, but the drawing hole 2
Since lot 6 is restrained with an appropriate margin during drilling, the parent and child pits 11 come into contact with the thin wall on the preceding drilling 1 side.
By tearing it down, a continuous groove 3 is created and a free surface is secured.

Figure 3 is a sectional view taken along line AA in Figure 6, which will be explained below.

A guide rod 4 is inserted into the pre-drilled hole 1, a guide frame 5 is attached to the guide rod 4, a lot 6 is held by the guide frame 5, and a predetermined drawing hole 2 is drilled to form a groove 3.

FIG. 4 is a front view of the mechanical equipment for drilling the throttle hole 2.

FIG. 5 is a side view of FIG. 4 from a position shifted 90 degrees.

Two rock drill m9s are mounted on the guide cell 8, the rod 6 is attached, and the throttle hole 2 is drilled through the centrifuge 10.

The embodiment shown in FIG. 6 shows the lower end of the hole 2 being drilled. It is placed in a position that matches the shape of the hole.

A guide frame 5 is inserted with a minute interval maintained using the guide rod 4 as a guide, and rods 6 are mounted on both sides of the guide frame 5 with a suitable margin.

The upper part of the lot 6 is attached to a rock drill 9, and the rock drill 9 is held in position by a guide cell 8.

Further, the rock surface portion of the lot 6 is held in position by a centrifuge 10 attached to the lower end of the guide cell 8.

As described above, the lot 6 is fixed at two places, upper and lower, by the guide cell 8 and the centrifuge 10, and the position of the tip of the hole is stable, so that it is possible to prevent the target from hitting the target and proceed with drilling accurately. Can be done.

The spring 12 is inserted into the upper part of the parent and child bit 11, and softens the impact force from the parent and child bit 11 that the upper guide frame 5 receives.

The guide frame 5 completely removes the thin rock wall between the drawing hole 2 and the pre-drilling hole 1 and constructs the groove 3.

"Effects of the Invention" Since the present invention is configured as described above, it produces the effects described below.

By systematically setting the position of the groove to be blocked on the rock and marking the position of the preliminary drilling/restriction hole, the restriction hole is accurately drilled, the prescribed groove is constructed, and the free surface is formed. can do.

Since the drill hole is equipped with a parent-child bit, it is possible to form blocks with wide groove widths, and it is possible to use a machine with stronger crushing force than conventional hydraulic crushers.

Furthermore, the combination of preliminary drilling and narrowing operations allows drilling of highly vertical holes to great depths.

A guide rod is inserted into the pre-drilled hole, and throttle holes are drilled on both sides through the guide frame, making it possible to form well-balanced holes.

In addition, the relationship between the guide rod and the lot is set at an appropriate interval using the guide rod, so the guide rod can move smoothly. Since rock is drilled including the wall between the drilled hole and the previously drilled hole by the slight deflection of the bit, there is no need to overlap the drawing hole and the previously drilled hole, making it possible to construct a groove with high precision.

And 1! between the lower end of the guide frame and the upper part of the parent and child bit! By inserting a spring as a shock absorber, the guide frame is protected from the impact of the parent and child bits, and at the same time, the vibration of the guide rod allows for continuity between adjacent holes, allowing for contact with the wall.

In order to hold the guide rod in an appropriate position, a step is formed between the parent and child bits during the preliminary drilling, and the tip of the guide rod is manufactured to fit into this hole, and the position of the tip is fixed.

Measure and adjust the position of the guide rod according to the rock surface, and secure it with a wooden wedge to stabilize it.

In addition, a guide cell was attached to the shovel-type excavator to enable mechanical work so that the preliminary holes were drilled in 10 holes and the narrowing holes were drilled in 2 pick-up lots.

As a result of the above, we have achieved practical application of easy and effective rock excavation work that constructs a wide continuous trench and forms a free surface.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the planned arrangement of the throttle holes in the shaft, Figure 2 is a detailed view of the continuous holes, Figure 3 is a diagram showing the throttle holes being drilled, and is a sectional view taken along line A-A in Figure 6. Figure 4 is a front view showing the machine arrangement, Figure 5 is a side view of Figure 4, and Figure 6 is a sectional view of the tip showing the throttle hole during drilling. 1... Preliminary drilling, 2... Restricted hole, 3... Groove, 4... Guide rod, 5... Guide frame, lot, shovel type excavator, guide cell, rock drill, cent. Riser parent/child bit, spring

Claims (1)

[Claims] 1. Drill a preliminary hole (1) at a predetermined position in the rock mass, and insert the preliminary hole (1) through a guide rod (4) inserted into the preliminary hole (1). Method 2: drilling continuous holes (2) at predetermined positions on both sides of the guide rod (4) and the rod (6), and holding the guide rod (4) and the rod (6); A guide frame (5) used for drilling a continuous hole (2) by the method according to claim 1.