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CN-115427660-B - Apparatus, miner and method for resin injection

CN115427660BCN 115427660 BCN115427660 BCN 115427660BCN-115427660-B

Abstract

An apparatus for injecting grouting material, a miner and a method for reinforcing a rock surface with grouting material. The apparatus (11) comprises an injector head (17) provided with mixing means (18), both the mixing means (18) and the injector head being insertable into the drilled hole (7). The apparatus is used for feeding a resin mixture (23 a, 23 b) having two different setting times. The injector head is connected to a fluid inlet arrangement (19) comprising a common first feed line for the slow and fast resin base components (A1, A2) and a second feed line for the resin catalyst (B).

Inventors

  • Crystal Combe
  • Mathieu Metzger
  • LAURENT DEMIA

Assignees

  • 山特维克矿山工程机械里昂有限公司
  • 山特维克矿山工程机械有限公司

Dates

Publication Date
20260505
Application Date
20210423
Priority Date
20200423

Claims (9)

  1. 1. An apparatus (11) for injecting grouting resin into a drilled hole (7) for rock reinforcement; Wherein the apparatus (11) is for feeding bulk fluid material and comprises: -an injector head (17) to be inserted into the drilled hole (7), the injector head (17) being a grouting resin feeding tool, whereby the tool is removed from the drilled hole (7) when the resin feeding is completed and before a separate rock bolt (24) is fed into the drilled hole (7) filled with the grouting resin; At least one fluid inlet arrangement (19) connected to the injector head (17), the at least one fluid inlet arrangement (19) for feeding a resin base component a and a resin catalyst B to the injector head (17); It is characterized in that -The injector head (17) is provided with mixing means (18), the mixing means (18) being for mixing together the fed resin base component a and the resin catalyst B, whereby the mixing means (18) are configured to feed together with the injector head (17) within the drilled hole (7); The fluid inlet arrangement (19) comprises two separate feed lines, wherein a first feed line (20) is selectable for alternately feeding a first resin base component A1 and a second resin base component A2, the first and second resin base components A1 and A2 being associated with two different setting times, and wherein a second feed line (21) is for a resin catalyst B; The apparatus (11) comprises a resin pumping arrangement (26) provided with two pumps, wherein a common first feed pump (27) is configured to alternately feed the first resin base component A1 or the second resin base component A2 to the first feed line (20), while a second feed pump (28) is dedicated to feed the resin catalyst B to the second feed line (21), and Wherein the apparatus (11) comprises at least one feed valve (31) for selectively connecting an inlet channel (32) of the common first feed pump (27) to a first container (13) provided for the first resin base component A1 or to a second container (14) provided for the second resin base component A2.
  2. 2. The apparatus according to claim 1, characterized in that The first feed pump (27) and the second feed pump (28) are volumetric pumps and are configured to operate synchronously, whereby the volume of the fed first resin base component A1 or second resin base component A2 is constant with respect to the fed resin catalyst B.
  3. 3. The apparatus according to claim 1 or 2, characterized in that The first feed pump (27) and the second feed pump (28) are powered by a common actuator (29).
  4. 4. The apparatus according to any of the preceding claims 1 to 2, characterized in that The apparatus (11) comprises a solvent feed system (34), the solvent feed system (34) being configured to feed a solvent medium for flushing the injector head (17) and the mixing device (18); and wherein the solvent feed system (34) comprises a third pump (35), the third pump (35) being for pumping the solvent medium from a third container (15).
  5. 5. The apparatus according to claim 4, wherein The solvent feed system (34) comprises a dedicated third feed line (22) for feeding the solvent medium from the third pump (35) to the mixing device (18).
  6. 6. The apparatus according to any of the preceding claims 1 to 2, characterized in that The apparatus (11) is controlled by a control unit, the sequence of addition between the first and second resin base components A1 and A2 and the resin catalyst B and solvent medium being managed according to time or flow measurements or pump movement measurements.
  7. 7. The apparatus according to any of the preceding claims 1 to 2, characterized in that The apparatus (11) being connectable to a mining machine (1), and The feeding device (12) of the mining machine (1) is configured to insert and move the injector head (17) and the mixing device (18) within the drilled hole (7).
  8. 8. A mining machine (1), comprising: A movable carrier (2); -at least one cantilever (3), said at least one cantilever (3) being movably connected to said movable carrier (2); -a device (11), the device (11) being adapted to inject a grouting resin into the drilled holes (7); -at least one bolting unit (10), said at least one bolting unit (10) being at the distal end of the cantilever (3), said at least one bolting unit (10) being for feeding a rock bolt (24) into the drilled hole (7) after injection of the grouting resin; And wherein the cantilever (3) is provided with feeding means (12) for moving an injector head (17) of the device (11) within the drilled hole (7); It is characterized in that The apparatus (11) for injecting the grouting resin is an apparatus according to any one of the preceding claims 1 to 7.
  9. 9. Method of injecting grouting resin into several drilled holes (7), wherein the method comprises: inserting an injector head (17) into the drilled hole (7); -providing the injector head (17) with a mixing device (18), whereby the mixing device (18) is inserted together with the injector head (17) into the drilled hole (7); feeding a resin base component a and a resin catalyst B to the injector head (17) through a fluid inlet arrangement (19); mixing the fed resin base component a with the resin catalyst B into a grouting resin within the drilled hole (7) by the mixing device (18); -starting injection of the grouting resin at a bottom portion (7 b) of the drilled hole (7), and moving (R) the injector head (17) and the mixing device (18) towards an opening (7 a) of the drilled hole (7) during the injection; Completing the injection and removing the injector head (17) from the drilled hole (7), and Inserting a metal rock reinforcement into the drilled hole (7) provided with the grouting resin; It is characterized in that Sequentially injecting two different grouting resins having different setting times into the drilled holes (7); -providing the fluid inlet arrangement (19) with two feed lines (20, 21), wherein a first feed line (20) is selectable with a feed valve (31) to alternately feed a first resin base component A1 and a second resin base component A2, the first and second resin base components A1, A2 being associated with two different setting times, and wherein a second feed line (21) is for a resin catalyst B; Feeding a first resin base component A1 and a second resin base component A2 associated with different setting times in a selective sequence through the first feed line (20), and The resin catalyst B is fed simultaneously with the first resin base component A1 or second resin base component A2 selected through the second feed line (21).

Description

Apparatus, miner and method for resin injection Technical Field The present invention relates to an apparatus for injecting grouting material into a drilled hole when reinforcing a rock surface with a rock bolt. The borehole is drilled by a rock drill, and the drilled hole is then provided with grouting material, and finally a rock bolt is inserted and fastened. More specifically, the solution involves the injection of two setting time resins. The invention also relates to a mining machine provided with a device for injecting grouting material and to a method of reinforcing a rock surface. The field of the invention is more specifically defined in the following. Background At mines, construction sites and other working areas, it is necessary to strengthen the rock surfaces in order to ensure their safety and suitability for the intended purpose. One common method of rock reinforcement is rock bolting. In such reinforcement systems several rock bolts are fastened in the drilled holes by grouting material. In this way the rock layers are bonded together, thereby reducing the risk of collapse. There are several different systems for inserting grouting material. However, current implantation approaches have been shown to involve some drawbacks. Disclosure of Invention It is an object of the present invention to provide a new and improved apparatus for feeding grouting material to a drilled hole. The invention also relates to a novel and improved mining machine and a method of feeding grouting material when reinforcing a rock surface. The idea of the disclosed solution is to inject bulk-like resin in fluid form into the drilled hole before inserting the rock bolt into the drilled hole. Furthermore, two different resins with different setting times are implemented in the injection. Grouting resin is injected by means of an apparatus comprising an injector head insertable into a drilled hole and comprising a mixing device. The apparatus further comprises a fluid inlet arrangement connected to the injector head for feeding the resin base component A1 or A2 and the resin catalyst B to the injector head. The mixing device is configured to mix the fed resin base component A1 or A2 with the catalyst B. The injector head and the mixing device are fed together within the drilled hole for the duration of the injection process. Furthermore, the mentioned fluid inlet arrangement comprises two separate feed lines. The first feed line may be alternately selected for feeding the first base resin component A1 or the second resin base component A2, and the second feed line is for feeding the resin catalyst B. In other words, the fluid inlet arrangement is provided with only two feed lines for feeding grouting resin material into the drilled holes. When the base resin components A1 and A2 are mixed with the catalyst B, they have different setting times. Catalyst B is a hardener for initiating a chemical reaction that converts a resin from a liquid to a solid. The advantage of the disclosed solution using only two feed lines for the resin component is that the diameter of the drilled holes of the disclosed solution can be smaller compared to a solution employing a larger number of feed lines. When the diameter of the drilled hole is smaller, the drilled hole can be drilled more efficiently, more quickly and with less energy consumption. The diameter of the rock anchors is typically between 14 and 18 mm, so relatively small diameter holes are sufficient for them. In addition, grouting requires a small amount of resin, as the hole is well suited to the small bolt diameter described above. The disclosed injector head and feed line can be fitted in very small holes, which can be as small as 30-35 mm in diameter. In such small diameter holes, it is difficult to add any additional hoses to manage the second component without increasing the pressure drop in the feed. Another advantage is that when the mixing device is located at the injector head, the resin base component A1 or A2 is mixed with the resin catalyst B as late as possible before injection into the drilled hole. This means that only a small amount of resin material is wasted when the injection head and the mixing device need to be cleaned between the injection measures of the drilled holes. Furthermore, the disclosed solution provides a system for feeding two resin mixtures with different setting times, whereby a fast setting resin mixture can be provided at the bottom of the drilled hole, whereas a slow setting resin mixture is provided after the fast setting mixture. During the injection process, the injection head is simultaneously retracted. Another advantage of the disclosed solution is that the structure can be simple and durable compared to known solutions provided with complex injection adapters. The disclosed solution may be implemented in different rock drills and bolting dollies (bolting jumbos). The system can also be easily retrofitted to existing mining equipmen