FR2517363A1 - Multi compartment resin and catalyst cartridges - for anchoring mining bolts supported by semi rigid netting and associated spacers - Google Patents

Abstract

Adhesive cartridges for anchoring bolts into rock, concrete etc. comprise a series of sealed envelopes contg. alternately complementary filled resin and catalyst/accelerator compsns., enclosed by tubular sheath of rolled semi-rigid netting supported by star-pattern spacers at each end. Used esp. for mounting bolts or studs or even rods inserted using low or negligible rates of rotation (0-150 rpm). The reagents mix more readily than those of a two part container, because of more uniform longitudinal distribution and because of mutual flow of reagents into the interstices of the netting sheath.

Description

 Cartridge for anchoring sealing, alternating load under a thread sheath.

 The present invention relates to the sealing loads of bolts or anchor rods in mine galleries, engineering structures and the like.

 French patent No. 69.03015 of February 10, 1969 described a sheath for such cartridges, constituted by a "thread tube". Reference may be made to this patent as regards the constitution and the role of this thread tube.

 We also knew from the French Certificate of Utility No. 75/01228 of January 16, 1975 that it was possible to concentrate, in a polyester type filler, the stubborn catalyst of the cartridge (that is to say towards the hole of the borehole, when the cartridge is in place in the hole), and a homogeneous mixture was nevertheless obtained.

 The Applicants have now discovered that by dividing the sealing charge into several separate "cartons", excluding any contact between their respective contents, according to the cherra:. charged catalyst / charged resin / charged catalyst ...

an excellent shelf life was naturally obtained, but also, surprisingly, that it was no longer necessary to drive the anchor bolt in rotation, and that, on the contrary, it was possible, despite the heterogeneous nature of the cartridge, to overcome this rotation while obtaining a sufficiently homogeneous mixture of the resin and the catalyst after the anchor rod has been put in place.

 This surprising result is apparently due on the one hand to the above-mentioned alternation of the reagents, and on the other hand to the fact that, before its disintegration, the net tube promotes good mixing thanks to the fore passage of the reagents in the holes in the net, when the rod sinks and tears the envelopes of the cartons.

 In addition, the cartridge according to the invention allows unusual, very large annular spaces. (up to about 20 mm).

It may be advantageous to use an elastic net tube
'cut', that is to say having a longitudinal slit over its entire length. Indeed, the elastic return keeps in place the cartons.

 It is also possible to use only one terminal star, possibly in combination with a "cut" thread tube.

 Other characteristics and advantages of the invention will be better understood from the description which follows, and from the appended drawing.

 Figure 1 shows in longitudinal section a preferred embodiment of the cartridge according to the invention.

 Figure 2 shows the net casing.

 Figure 3 shows the terminal star.

 Figure 4 shows the cross-section of a "cut" thread tube cartridge.

The drawing references have the following meanings
1. tearable wall of the "berlingot"
2. "putty" (resin + fillers)
3. charged catalyst
4. "net" tube
5. net tube holes
6. terminal star
The following example illustrates the invention without however limiting its scope.

EXAMPLE:
A charge was made according to the invention, which consists of the following elements:
- polyamide sheath with flat width = 33 mm or diameter - 21 mm
- polystyrene net tube
. inner diameter = 22 mm
. outer diameter - 25.3 mm
length = 805; nm
- 2 stars (e.ilorfes) in polyethylene
- the sealing load consists of:
. 4 cartons of "catalyst-pasty" in the sheath
polyamide with a diameter of 21 mm - length 40 mm,
. 3 cartons of "putty" based on a polyester resin
unsaturation in the 21- mm diameter polyamide sheath,
length = 200 mm.

Putty formulation
NORSODYNE 693 = 165 parts by weight
DMPT = qsp reactivity
AEROSJL 200 = 1.5% / resin
Chalk GY 100 = 400 parts by weight
Density = 1.85 to 1.90 g / cc
Formulation of the catalyst
LUCIDOL BL 50 = 7.67% by weight
DIBUTYLPHTALATE = 15.64% by weight
CERECLOR 56 L = 3.07 Z by weight
Chalk GY 100 = 73.62% by weight
Density = 1.90 to 1.95 g / cc
Nature and provenance of the products used
NORSODYNE 693 = :: Unsaturated polyester resin
by CDF CHIMIE
AEROSIL 200 = surface colloidal silica
specific 200 m2 / g1 supplied
by DEGUSSA
LUCIDOL BL 50 = Benzoyl peroxide at 50% in
Dibutylphthalate, supplied by AKZO
CERECLOR 56 L = Chlorinated paraffin - content of
chlorine 56 provided by HERE
Chalk GY 100 = Mineral filler supplied by OMYA
In the cartridges according to the invention, the mastic represents from 70 to 90%, preferably approximately SO 2, of the volume of the charge, and the pasty catalyst from 30 to 10%, preferably approximately 20 t.

 To obtain a good sealing quality, the length of a container of mastic will be 150 to 250, preferably 200 mm, and the length of a container of pasty catalyst will be 30 to 50 mm, preferably 40 mm.

 We can choose a non-symmetrical arrangement of the cartons (catalyst cart at one end, putty at the other), or a symmetrical arrangement, but, quite preferably, we will place a cart of pasty catalyst in "head "from the cartridge.

 In an exemplary embodiment, which is the preferred mode which corresponds to the appended Figure 1, there is the arrangement catalyst / sealant / catalyst / sealant / sealant / catalyst.

Advantages of cartridges according to the invention
. The putty and the pasty catalyst are completely separated
this allows a good lifetime of the products.

. This type of load allows the anchoring of bolts in
annular space conditions impossible for loads
conventional sealing (i.e. with annular space
very large).

. This type of load allows the use of very low
rotation speeds (for example: 100 to 150 rpm), even
null.

In the same sealing charge, we can have a sequence
different reactivity; either by cartons of putty
of different reactivity, either by cartons of
pasty catalyst with similarly different reactivity (instead
LUCIDOL BL 50 you can take the LUCIDOL GB 50 w
benzoyl peroxide + 2.4 dichlorobenzoyl peroxide).

Anchoring example
The cartridge was used as described in the example above and shown in FIG. 1.

- rod: diameter 20 mm, length 2.20 m
- rotation speed: 1000 rpm.

- quality of the seal (visual examination in a tube)
homogeneous sealing.

 - manual setting time: 60 - 90 sec.

 - gratin diameter: 28 mm.

 It can be seen that the charges according to the invention make it possible to overcome the usual upper limit of approximately 4 mm with regard to the annular space.

 Two variants of this implementation at 100 and 0 revolutions / minute have given substantially identical qualitative and quantitative results.

Claims (10)

1. Cartridge for sealing rods or anchor bolts, characterized in that the sealing charge is divided into separate cartons containing, some resin and fillers, others the catalyst and fillers, and arranged alternately in a rigid or semi-rigid tubular sheath, the mesh structure of which forms a "net", closed at each of its two ends by an element having star protuberances which are blocked in the meshes of the net tube. 2. Cartridge according to claim 1, characterized in that the thread tube is made of polystyrene 3. Cartridge according to claim 1 or 2, characterized in that the canvas elements are made of polyethylene. 4. Cartridge according to any one of claims 1 to 3, characterized in that the resin is of the unsaturated polyester type and the catalyst is benzoyl peroxide. 5. Cartridge according to any one of claims 1 to 4, characterized in that it comprises only one star. 6. Cartridge according to any one of claims 1 to 5, characterized in that the net tube is elastic with a centripetal restoring force and "cut" over its entire length. 7. Cartridge according to any one of claims 1 to 6, characterized in that it comprises cartons whose content has different reactivities, at the level of the resin and / or the catalyst.  8. Cartridge according to any one of claims 1 to 7, characterized in that the sequence is as follows (ta te) catalyst / mastic / catalyst / castic / catalyst / mastic / catalyst. 9. Cartridge according to any one of claims 1 to 7, characterized in that the sequence is as follows (head) mas t ic lcatalyseurlmas ticlatalyseurlmasticlcatalyst. 10. Use of a cartridge according to any one of claims 1 to 9 in boreholes whose annular space can reach about 20 mm.