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Method for cutting flat stone through long crack propagation

A technology of crack extension and flat plate, applied in stone processing tools, stone processing equipment, manufacturing tools, etc., can solve the problems of rough section, high cost, poor quality, etc., and achieve the effect of smooth section and low cost

Active Publication Date: 2014-05-28
李衍远
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disintegration process of flat stone adopts the cutting method or hole splitting method of the prior art. The cutting method forms a section with good quality, but the efficiency is low, the cost is high, and the equipment installation and adjustment are quite troublesome; the hole splitting method is compared with the cutting method. , high efficiency, low cost, easy installation and adjustment of equipment, but the formed section is rough and of poor quality

Method used

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  • Method for cutting flat stone through long crack propagation
  • Method for cutting flat stone through long crack propagation
  • Method for cutting flat stone through long crack propagation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 , 2 As shown, draw a predetermined vertical section position on the surface of the flat stone 1 to form section lines, the distance between the section lines is the width of the feldspar strip, and the width is not less than the thickness of the flat stone. Cut a through-long crack groove 2 with a depth of 0.15-0.3m at the predetermined vertical section position with a road repairing slitting machine. The greater the thickness of the flat stone, the greater the depth of the crack groove 2 within the range of 0.15-0.3m. Between the two crack grooves 2, a series of alternating holes 3 are drilled with a rock drill, and the diameter of the alternating holes 3 Preferably 40-60mm, the pitch of the alternating holes is 4-10m, and the hole depth is 4-10cm larger than the thickness of the flat stone, preferably 5cm, that is, entering the rock mass 4. The flat stone 1 is only placed on the upper end of the rock mass 4 (the flat stone has been separated from th...

Embodiment 2

[0042] In order to better limit the crack propagation direction on the vertical plane, a guide hole 7 is provided in the crack groove 2 of the first embodiment. Utilize the crack groove 2 and the groove line of the guide hole 7 hole wall to have a guiding effect, and the crack propagation direction is limited to the vertical plane where the crack groove and the groove line of the guide hole 7 hole wall are located.

[0043] Such as image 3 , 4 As shown, draw the vertical section position on the surface of the flat stone to form a section line. The distance between the section lines is the width of the feldspar strip, and the width is not less than the thickness of the flat stone. Add a plurality of guide holes 7 on the section line, the distance between the guide holes 7 is 4-10m, and the two guide holes 7 close to the two edges of the flat stone are 0.8-2m away from the edge of the flat stone. The diameter of the guide hole 7 is 40-60mm, which is the same as the diameter o...

Embodiment 3

[0048] Such as Figure 5 As shown, in order to reduce the mining equipment used, this embodiment reduces the water pump and pipeline 9 in Embodiment 2, and uses the expansion agent to be filled in the guide hole 7 and the crack groove 2 (expansion cement is selected as the expansion agent). The pressure produced by the expansion agent after expansion also increases with time, until it stabilizes after reaching the maximum expansion force. The maximum expansion force produced), so that the cracks in the crack groove 2 and the vertical groove 8 in the guide hole are in a quasi-static stress state of expanding. Then start the hydraulic system with alternating output pressure, and use the alternating water pressure pressed into the gap between the flat stone 1 and the rock mass 4 to generate alternating force in the vertical direction on the flat stone, and through the effect of alternating tensile stress, cracks The crack tip of the groove 2 generates alternating tensile stress ...

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Abstract

The invention discloses a method for cutting a flat stone through long crack propagation. The method includes the steps that according to the thickness requirement of the cut flat stone, through long crack grooves are cut in the preset vertical section of the surface of the flat stone, a series of alternating holes are drilled between the two crack grooves through a rock drill, pipes connected with a hydraulic system for outputting alternating pressure are inserted into hole openings, and then the hole openings are sealed; the hydraulic system for outputting alternating pressure is started, the output pressure of the hydraulic system is gradually increased, water in the holes is continuously pressed into the gap between the flat stone and a rock mass, upward force alternates along with the output alternating pressure of the system, through the alternating tensile stress effect, the long crack grooves in the surface of the flat stone are cracked and propagated in the opening type propagation stress state, cracks are continuously propagated, and then the flat and through vertical section is formed. The method for cutting the flat stone into long stone strips with rectangular sections is low in cost, has a great cost advantage in stone machining and can be applied to infrastructure engineering.

Description

technical field [0001] The invention relates to stone processing, in particular to a method for splitting a flat stone by using long cracks to expand; it is used to divide a flat stone with a large area into regular hexahedrons, which is a dismantling process for the flat stone. Background technique [0002] The long crack growth method has the advantages of high efficiency and low cost in forming the cross section. Chinese invention patent ZL200710028630.X applies it to form a through horizontal section, and the separated body formed is a flat stone with a large area. It is necessary to divide the flat stone with a very low unit volume cost to form a stone product. The stone is divided into feldspar strips with a rectangular cross-section, and then the feldspar strips are divided into regular hexahedral stones with a crawler chain arm saw machine. Such stones have great cost advantages. [0003] Groove expansion cracking method is a method in the hole splitting method. The...

Claims

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Application Information

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IPC IPC(8): B28D1/32
Inventor 李坚李衍远
Owner 李衍远
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