JPS60501164A - Roof bolt installation method and device - Google Patents

Abstract

In roof bolting, when an anchor rod (24) is to be inserted in a borehole (26) in the rock, a cement grout is ejected as a jet from a nozzle (22) located at the mouth of the borehole to partially fill the hole before the rod is forced into the borehole. The jet of grout should have such a velocity that it reaches the bottom of the borehole. A grout pump (45, 60) forces the grout through a hose (28) to the nozzle (22).

Description

[Detailed description of the invention] Roof bolt installation method and device The present invention involves drilling a hole in rock and inserting a lump of bulk grout into the hole. and how to install the roof bolt by pushing the anchor rod into this hole. It is something. The invention also provides an apparatus and route for introducing grout into the drilled hole. This invention relates to a bolt mounting device.

US-A-4158520 describes drilling, bolt setting machines and two-component resin cars. A roof bolt installation device is disclosed that has a roof bolt loading device. resin car The cartridges are blown into drilled holes and their contents are removed by bolts. Stir to form a hardened product. GB-A-9,53056 has dry cement mold Roof bolt installation car with separate compartments for roof bolts and water) IJ Tsuji Disclosed. Also insert the hose in the bottom housing of the drilled hole and drain the hose. It is also known to pour cement grout through a hose while pulling it out. It is. This method is based on the roof bolt installation method disclosed in US-A-4351625. It can be used at any location.

The invention will now be described with reference to the accompanying drawings.

FIG. 1 is a side view showing a self-propelled roof bolt mounting device according to the present invention.

FIG. 2 is a plan view of the apparatus shown in FIG. 1.

Figure 6 is an enlarged cutaway view taken from arrow 6-6 in Figure 1, and Figure 4 is shown in Figures 1 and 2. FIG. 3 is a detailed side view.

FIG. 5 shows a roof bolt that can be set by the device.

The roof bolt installation device shown in the drawings has a chassis 12 with wheels. A boom 13 is swingably attached to the chassis 12. Boom 13 is the feed beam 14 is rotatably held. A sliding member 15 is attached to the feed beam 14, This sliding member 15 is then delivered in the usual manner by a fluid delivery system, not shown. can be moved along the ρ beam.

A mechanical moving device 16 is attached to the rear end of the feed beam 14 . Sliding member 1 5 is in the rearmost position as shown in FIG. The drilled Iwatsuki 17 can move away from the sliding member 15 and move to the left in the drawing. Instead, a bolt installation device 29 is moved onto the sliding member 15. This horizontal direction Movement ij: carried out by an a-body cylinder. The bolt installation is done by the device 29. Equipped with a physical force motor that rotates the bolt as it is pushed into the drilled hole. Do it like this. At the front end of the feed beam 14, a support 19 is arranged along an axis parallel to the feed beam. It is designed so that it can rotate around the This support 19 is made of drill steel. 21 of the guide member 20, the nozzle 22 and the roof bolt 24 of the type shown in FIG. It supports the guide member 26. The roof bolt magazine is marked 46 in Figure 1.2. Indicated by The bolt 24, that is, the anchor rod, is a bar material 53, and the washer, that is, the plate material 54. and nut 55. The fluid cylinder 25 indicates the operating position. The guide member 20 of drill steel which is shown can be swung aside and the nozzle 2 2 and the guide member 26 of the roof bolt are connected to the rock drill 17 and its drill steel. can be alternately swung into an operating position aligned with the hole 26 drilled by the wheel 21. . The actual front part of the feeder beam 14 is made of hard rubber that supports it against the rock. A support pad 27 is provided.

The hose 28 connects the nozzle 22 to a cement grout supply device attached to the chassis 12. It is connected to 30.

The cement grout supply device 30 includes a frame 61 attached to the chassis 12. There is. This frame 61 includes a plate 32 and a sliding member on the plate 32, that is, the shack 3. 4. The guide member 33 that guides the The shutter 64 is a cement mixer 65 This cement mixer 35 has a conical housing 36 and a rotary agitator 3. 7, and the agitator 67 has a fluid camo taro 8 on the cover 42 of the housing 36. driven by. The housing 66 forms a mixing chamber which is also a storage chamber.

The bottom end of the conical housing 36 is coaxial with the hole 69 in the shutter 34. Stirrer 37 is journal-supported by the spider 40 mounted in the hole 69. hose 2 8 is connected to the hole 41 of the shutter 34.

The cylinder 45 is lowered onto the yoke 46, and the yoke 46 has two poles) 47. It is suspended by 48.

There are two spacers between the yoke 46 and the nuts 51 and 52 of the bolts 47 and 48. Two short hydraulic jacks 49°50 are provided.

These jacks 49 and 50 are applied to the sliding member 34 by the force that moves the sliding member 34. The end face of the cylinder 45 is permanently biased against the cylinder 45. Therefore Jacket 49.50#'i, with considerable force to withstand high pressure. It can be actuated to tighten the cylinder 45 against the shutter. to cylinder 45 To apply a constant force, use a jack 49.50, a<, frame 31 and A spring can be connected between the bolt 46 and the jack 49, 50H. It can be used for.

Piston 60 can slide within cylinder 45. This piston 60 #i piston rod A piston rod 61 is provided which slides on a piston 62. fixie The piston rod 59 of the piston 62 is fixed to the frame 31. piston 6o The lower annular chamber 57 is flushed with water supplied via a supply conduit 58.

The fluid supply passage 66 is connected to a cylinder in order to force the piston 6o upward during the operation process. The supply passage 65 communicates with the chamber 64 and forces the piston 6o downward during the return process. It communicates with the cylinder chamber 66 for control.

A fluid cylinder 69 is connected between the frame 31 and the shutter 64 and The shutter 34 is moved between two fixed positions. As shown in Figure 4, When the cutter 34 is in the rightmost position, the cement mixer 35 is in the same position as the cylinder 45. It becomes the axis. In the intermediate position, the hole 41 is coaxial with the cylinder 45. further to the left When in position, the conical housing 66 of the mixer 35 communicates with the hole 67 in the plate 32. do. A hose 68 extends from the hole 67 to the ground.

Next, we will explain the operation of bolt installation.

Cement grout is applied to the mixer 35 during transport or before drilling the first hole after blasting. intended. Usually grouting is made of only hydraulic cement, e.g. Boatland cement. Mulch and water are used, but often cement mortar mixed with fine sand is used. I can stay. The shutter 34 is first moved to its intermediate position, aligning the hole 41 with the cylinder. The shutter 32 forms the bottom of the cement mixer 35 and the mixer 65 A layer of dry cement mortar is placed over the dry surface, and a predetermined amount of water is added to it. added. The Cement motor 38 is started and the agitator 37 mixes cement and water. Make grout. The shutter 34 is moved to the position shown in FIG. is moved downward from the uppermost position by fluid oil supplied to chamber 66 through passage 65. The grout fills the cylinder 45 as it is poured. The length of the downward return process is 70 can be adjusted by means of an axially adjustable sensor as shown in FIG. 5.60 effective cylinder volume can be predetermined and a predetermined amount of Grau)? It is made possible to supply the cylinder 45. Shirts again 3 4 is moved to the left in FIG. 4 to form a cylinder head with an outlet 41. be made into Piston 60 then connects fluid oil supplied to chamber 64 through passage 65. The grout in the cylinder 45 is thus actuated to carry out an upward movement step, i.e. to move the grout in the cylinder 45. Make sure to push it out to the hose 28. The pressure inside the cylinder 45 is, for example, 10 Mp. a, and the pressure within the nozzle 22 may be IMpa. Jyatsuki 49.50 indicates that the cylinder chamber 66 is pressurized and the space between the cylinder 45 and the shutter 34 is When a good seal is obtained, tighten the cylinder 45 against the shutter 34. It is operated so that In operation, the hose 28 is filled with grout and the piston 60 is moved. The process is repeated until grout is ejected from the nozzle during the operating process. Ru.

The bolt installation operation can then begin. In other words, for the feed beam 14#i bedrock Once positioned and forced, the rock drill 17 is activated to drill a hole in the rock. Ru. During the drilling operation, the cylinder 45 is filled with grout and the shutter 34I 'i is moved to its intermediate position, forming the head of the cylinder 45 as described above.

Once the hole is drilled, the fluid cylinder 25 is actuated to open the nozzle 22 in the drilled hole. Align with 26. The nozzle 22 is thus positioned at the mouth of the drilled hole. Noz The lever is adjacent to the mouth but is a distance away from the mouth as seen in FIG.

It can be, for example, a few meters or a few dm from the mouth of the hole. Then piston 6o When activated, it forces a predetermined amount of grout into the hose 28, which in turn forces a corresponding amount of grout into the hose 28. The water is ejected from the nozzle 22 as a jet that reaches the bottom of the hole. The diameter of the nozzle is It should be reduced smoothly as shown in Figure 4 to form a jet rather than a spray. It is possible. The outer diameter of the nozzle should be less than half the diameter of the hole drilled or less than It is. - As an example, the diameter of the drilled hole is 4 on, and the hole is directly connected to the anchor rod. The diameter is #-t30m, and the outer diameter of the nozzle is 8 电. grout being squirted The amount should not completely fill the hole. That amount is determined by the bolt when the bolt is inserted. It should be calculated to fill the gap between the hole and the drilled hole. Therefore, the eruption The batch volume of grout to be dispensed is usually about half the volume of the drilled hole. preferred In other words, the cylinder 45 and piston 60 can be drilled with a single injection and a sufficient amount can be inserted into the hole. It is designed to supply grout. However, it is also less It is also possible to eject the liquid more than once. Normally, the worker will use the bolt magazine. Dry cement and water are added to housing 36 when chamber 43 is empty.

Instead of using the nozzle outside the hole drilled as described above, insert the nozzle into the hole. You can also be It should be on the outside of the part of the hole that will be filled with grout. Do not insert it too deeply as this may cause damage. Therefore it is opened The hole must be located outside the axial middle position of the hole. Insert the nozzle into the hole One advantage is that the nozzle is guided by and aligned with the hole. The advantage is that it can be designed to

However, inserting the nozzle into the drilled hole complicates the operation. figure It is easier to move the nozzle only laterally as shown.

It is usually unavoidable that the jet contacts the hole wall before reaching the bottom of the hole. However However, if the speed at the time of ejection is faster than about 4 m/8, the jet will fill the hole from the bottom. I understand. Therefore, the velocity of the jet should be at least 6 m/s, preferably 8 to 15 m/s. /a.

Thus - once the mass of grout has been loaded into the drilled hole, the bolt installation is The machine is activated and pushes the bolt into the hole until the plate of the bolt contacts the rock.

When the grout has hardened, the nut 55 can be tightened. Leaked cement leaks into equipment There is a risk that it will harden on top and render the equipment inoperable. Because hydraulic cement is used .

This problem involves spraying water on critical areas continuously or at short intervals during operation. This can be easily solved by For this purpose, the device contains several sprays. A nozzle is provided. Some major nozzles are shown in the drawing. Support 19, guide A nozzle 72 is provided for the member 20.23 and the ejection nozzle 22. child The spray nozzle also wets the bolt during bolt insertion. Naturally, to nozzle 22 The spray nozzle is thus turned off when ejecting the grout jet. Sha Two spray nozzles 75 and 74 are installed in the cutter 34, and a housing 36 is also installed. Spray nozzle 75 that sprays into the housing 36 when the cover 42 is opened. is provided. When suspending operation for a long period of time, the shutter 34 is moved to the leftmost position. The housing 66 may be cleaned when the housing 36 is opened and the hose 68 is Let it drain. Return the thus cleaned housing 36 to the position shown in FIG. Water is applied to the housing 36 and the piston 60 is reciprocated to clean the cylinder 45.

In the above-described preferred embodiments of the invention, elements that are not important for understanding the invention will not be explained in detail. For example, the magazine 42 and its operation will be described in detail. I won't reveal it. The operation of the shutter 64, piston 60 and jack 49.50 is supported. preferably automatically with the indication of the body 19 and the change of the machine in the sliding member 15. It is done.

Brief description of the drawing Procedural amendment (formality) 1. Display of incidents Roof bolt installation method and device 3. Person who makes corrections Relationship to the incident: Patent applicant Address Sweden 11. Varnish-1052s, Stockholm (Street address and other information) none)

Claims (1)

[Claims] t.Drill a hole in the bedrock and fill the hole (26) with a lump of bulk grout, and a roof bolt consisting of pushing the anchor rod (24) into the hole (26). In the root installation method, - the grout in the stub forms a jet that reaches the bottom of the hole. The grout is spouted from the nozzle (22) at the mouth of the hole (26) at a speed such that A roof bolt installation method characterized by: 2 Connected to the nozzle (22) and into the nine grout filling conduits (2B). Push in the grout and squirt a corresponding amount out of the nozzle as a lump of grout. A method according to claim 1, characterized in that: 5. Measure the grout and push it into the conduit using the actual water pump (45, 60) The method according to claim 2, characterized in that: 4. Use a pump (45°60) equipped with a piston (60) that can reciprocate, and Claim characterized in that the grout is measured using the effective cylinder volume of the pump. The method described in Clause 3 of the scope. 5. Direct the jet from the nozzle (22) at a speed of 4 m/8 to the bottom and a speed of 6 m/II to the bottom. A method according to any one of the preceding claims, characterized in that the method comprises ejecting. 6 While pushing the anchor rod (24) into the hole, insert it into the anchor rod (24). A method according to any one of the preceding claims, characterized in that water is applied. 2. Drill a hole in the bedrock, fill the hole (26) with a lump of bulk grout, and a roof bolt consisting of pushing the anchor rod (24) into the hole (26). V in the bolt mounting method, in the hole (26) outward from the axial midpoint of the hole (26). - from a nozzle (22) positioned or positioned outside the hole (26); A roof bolt installation method characterized by squirting grout in a round shape. a　From the bulk grout standing device (35) and the storage foot device (35) to the hole (26) a conduit (28) for transferring grout and forcing the grout through said conduit (28); A method according to any one of claims 1 to 7, comprising an apparatus (45, 60) for In the device for grouting into holes according to a nozzle (22) and said device for forcing grout through the conduit is provided with a nozzle (22); 2) A high pressure is applied to the grout so that the grout is ejected as a jet. A device characterized in that it consists of a real displacement pump (45°60) which is arranged so as to θ A substantially vertical pump with a piston (60) that allows the pump (45, 60) to reciprocate It has a straight cylinder (45) and also has an outlet (four holes) to said conduit (28). 1 cylinder head (34) and grout supply passage to the operating position on the cylinder ( 39) and a second cylinder head (with a device for alternately positioning the 3 cylinder heads). 9. Apparatus according to claim 8, characterized in that: and t. 10. The first, lK2 cylinder head (54) can slide together in the lateral direction, and A storage device (35) is provided on the second cylinder head (64). The apparatus according to claim 9. 11. Chassis (12), boom (16) swingably attached to the chassis , and is rotatably attached to the end of the boom and drilled in the hole with the rock drill (17). An assembly ( 14), the above-mentioned drilling rock (17), the above-mentioned device (22) and the above-mentioned bolt installation Claim: The machine (29) is movable sequentially into the operating position on the assembly (14). A roof bolt installation device that implements the method described in any one of paragraphs 1 to 10. The hole drilled by Iwatsuki (26 ) with its operating position at the mouth of the actual displacement pump mounted on the chassis (12). a nozzle (22) connected to a grout storage device (45, 60); (65) is attached to the chassis (12) and supplies the pump (45, l5O) The pump (45, 60) sprays grout from the nozzle (22). The special feature is that high pressure is applied to the grout so that it ejects as a stream. Roof bolt installation device with characteristic features. Engraving (no changes to the content)