GB1569805A - Shuttering members for loose materials bunkers - Google Patents

Description

(54) IMPROVEMENTS IN OR RELATING TO SHUTTERING MEMBERS FOR LOOSE MATERIALS BUNKERS (71) I, PAUL HUNGERBACH, a citizen of the Federal Republic of Germany of Kiefemhalde 27a, 4300 Essen-Bredeney, Federal Republic of Germany, do hereby declare the invention for which I pray that a patent may be granted to me and the method by which it is to be performed, to be particularly described in and by the following stateeeent: - This invention relates to shuttering members for loose materials bunkers, particularly of the type with an outer helical chute.

Loose materials bunkers are known in various forms of construction. In underground workings they have the duty of conveying the loose materials such as coal, waste, or the like from a higher to a lower level and to bunker it, e.g. in the neighbourhood of an installation to wind it up the shaft. In a known form of construction the bunker wall consists of concrete cast in situ whilst the helical chute is built of reinforced con crete Irre-forms which are attached to the bunker wall with brackets and tiecrods by means of threaded bolts. Firstly this wastes effort in erection, and in respect of the technique of attachment, for the union of the reinforced concrete pre-forms to the steel construction requires special processes.

Furthermore, undesirable vibrations arise in the steel construction during the use of a bunker built in this manner, which are detrimental to the bond between the steel construction and the reinforced concrete pre-forms and can lead to premature breakdown of the latter. Moreover loose materials bunkers are known in which an outer helical chute of individual reinforced concrete pre-forms is secured to the concrete masonry of the bunker wall. Expensive construction results from this also. The invention is intended to avoid these difficulties.

According to the present invention there is provided a loose materials bunker shuttering member, said member being fonned as a panel with a resilient inner layer and a wearresistant outer layer, whereby said panel can remain as dead shuttering and form the surface of the bunker.

The invention arises from the recognition that loose materials bunkers, especially those with outer helical chutes, permit of a con struction that is particularly effective, econ omic, and appropriate for their purpose if the outer casing necessary for the bunker wall and outer helical chute can remain permanently in the bunker wall and outer helical chute as dead shuttering. This requires however a shuttering member which is not only of the correct shape for the bunker wall and outer helical chute but is also a shuttering member suitable for the working conditions, which is fulfilled by the panel according to the invention.As this panel, which is an extremely thin-walled shuttering member, is constructed of a resilient inner layer and a wear-resistant outer layer, neither vibrations nor the occurrence of wear are to be feared during handl ing of loose materials, which could lead to premature breakdown. Similarly to these con structions in which an outer helical chute of individual reinforced concrete preforms is built into the concrete masonry of the bunker wall, the outer helical chute is also a part of the bunker wall, which however consists of concrete cast in situ. It is as it were a component part of the bunker wall. In addition to this, the need to remove shuttering now disappears.

Further important features of one embodiment of the invention are specified below. Thus it is provided that the panel is formed as a part cylindrical section, particularly as a rectangular section of a cylinder. For the casing of the outer helical chute, it is provided that the panel is part of a helically-moulded portion of the helical chute. Preferably the panel possesses anchoring devices, e.g. anchoring bars, on its rear surface, so that a true bond with the concrete cast in situ is achieved.

Mutual clamping of the panels in the course of erecting the outer casing for the bunker wall and the outer helical chute is effectively obtained if the panel possesses damping fillets for the neighbouring panels around the rear of its periphery, so that a good conF nection and thereby a sealed outer casing is ensured. Furthermore a layer of adhesive bonding may be applied to the resilient inner layer so that a particularly close bonding, in fact an additional adhesive bond between concrete cast in situ and the panel is achieved.

The resilient inner layer preferably consistsof a suitable synthetic plastics material, the wear-resistant outer layer on the other hand preferably consists of fused basalt or plastics.

Alternatively, the inner and outer layers can be formed from the same resilient yet hard-wearing material such as cement strengthened with fibres or concrete im- pregnated with polymers. Preferably the fibres consist of polypropylene, polyamide, carbon, glass especially alkali-resistant glass, or steel. Methyl methacrylate is preferably employed as the polymer.

The advantages achieved by the invention are essentially seen in that a shuttering memper for the outer casing of loose materials bunkers, especially with outer helical chutes is realised, which makes possible their con struction in concrete cast in situ particularly simple, rapid, and appropriate for use. For this purpose panels are used as shuttering members which remain in the bunker wall permamently as dead shuttering, whilst form ing the surface of the bunker wall and with it also that of the outer helical chute.

One embodiment of the invention will now be described with reference to the accompanying drawing, which is a perspective representation of a section of the bunker wall of a loose materials bunker with an outer helical chute employing shuttering members according to the invention.

Each of the shuttering members used for the loose materials bunker 1 illustrated, of concrete cast in situ with an outer helical chute 2, is formed as a panel 3 and to this end is constructed from an inner resilient layer 4 and a wear-resistant outer layer 5.

According to the application, the panel 3 can on one hand be formed as a section of a cylinder, particularly a rectangular section of a cylinder, or on the other hand as a part for a helically formed helical chute. On its rear surface the panel is provided with anchoring devices 6, e.g. anchoring bars, and clamping fillets 7 around its periphery and on its back surface for attachment of the adjoining panels. An adhesive bonding layer, which is not shown, e.g. of synthetic plastics cement, can be applied to the resilient inner layer 4. The resilient inner layer 4 consists of glass fibre reinforced synthetic plastics. The wear-resisting outer layer 5 consists of, such as, hard concrete, fused basalt or plastics with hard materials inserts as appropriate.By these means a shuttering plate is formed which as a whole is vibration-absorbing and has outstanding rigidity and wear characteristics.

To instal a loose materials bunker 1 with an outer helical chute 2 by casting concrete in situ, an outer casing of panels 3 is erected as a bunker wall within the bunker shaft, a steel reinforcemellt 8 is introduced into the space between this outer casing and the shaft wall and this space is filled up with concrete cast in situ. If panels 3 such as those of the invention are used as shuttering plates then they can be left in the bunker wall as dead shuttering to form the bunker wall surface.

In this connection the bunker wall surface naturally includes the surface of the outer helical chute.

WHAT I CLAIM IS: 1. A loose materials bunker shuttering member, said member being formed as a panel with a resilient inner layer and a wearresistant outer layer, whereby said panel can remain as dead shuttering and form the surface of the bunker.

2. A shuttering member as in Claim 1, wherein the panel is formed as a section of a cylinder, particularly a rectangular section of a cylinder.

3. A shuttering member as in Claim 1, wherein said panel is helically formed, whereby said panel can form the surface of a helical chute built on to the bunker wall.

4. A shuttering member as in any of Claims 1 to 3, wherein the panel is provided with anchoring devices, e.g., anchoring bars, on its rear surface.

5. A shuttering member as in any of Claims 1 to 4, wherein the panel bears clamping fillets around its periphery and on its rear surface.

6. A shuttering member as in any of Claims 1 to 5, wherein an adhesive bonding layer is applied to the resilient inner layer.

7. A shuttering member as in any of Claims 1 to 6, wherein the resilient inner layer con sists of a synthetic plastics material.

8. A shuttering member as in any Claims 1 to 7, wherein the wear-resistant outer layer consists of hard concrete, plastics with hard material inserts, or fused basalt 9. A shuttering member as in any of Claims 6 to 8, wherein the adhesive bonding layer consists of synthetic plastics cement 10. A shuttering member as in any of Claims 1 to 6, wherein the inner and outer layers are formed from the same resilient yet hard wearing material such as cement strengthened by fibres, or of concrete impregnated with polymers.

11. A shuttering member as in Claim 10, wherein the fibres consist of poylpropylene, polyamide, carbon, glass, preferably alkali- resistant glass, or steeL

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (13)

**WARNING** start of CLMS field may overlap end of DESC **. fillets for the neighbouring panels around the rear of its periphery, so that a good conF nection and thereby a sealed outer casing is ensured. Furthermore a layer of adhesive bonding may be applied to the resilient inner layer so that a particularly close bonding, in fact an additional adhesive bond between concrete cast in situ and the panel is achieved. The resilient inner layer preferably consistsof a suitable synthetic plastics material, the wear-resistant outer layer on the other hand preferably consists of fused basalt or plastics. Alternatively, the inner and outer layers can be formed from the same resilient yet hard-wearing material such as cement strengthened with fibres or concrete im- pregnated with polymers. Preferably the fibres consist of polypropylene, polyamide, carbon, glass especially alkali-resistant glass, or steel. Methyl methacrylate is preferably employed as the polymer. The advantages achieved by the invention are essentially seen in that a shuttering memper for the outer casing of loose materials bunkers, especially with outer helical chutes is realised, which makes possible their con struction in concrete cast in situ particularly simple, rapid, and appropriate for use. For this purpose panels are used as shuttering members which remain in the bunker wall permamently as dead shuttering, whilst form ing the surface of the bunker wall and with it also that of the outer helical chute. One embodiment of the invention will now be described with reference to the accompanying drawing, which is a perspective representation of a section of the bunker wall of a loose materials bunker with an outer helical chute employing shuttering members according to the invention. Each of the shuttering members used for the loose materials bunker 1 illustrated, of concrete cast in situ with an outer helical chute 2, is formed as a panel 3 and to this end is constructed from an inner resilient layer 4 and a wear-resistant outer layer 5. According to the application, the panel 3 can on one hand be formed as a section of a cylinder, particularly a rectangular section of a cylinder, or on the other hand as a part for a helically formed helical chute. On its rear surface the panel is provided with anchoring devices 6, e.g. anchoring bars, and clamping fillets 7 around its periphery and on its back surface for attachment of the adjoining panels. An adhesive bonding layer, which is not shown, e.g. of synthetic plastics cement, can be applied to the resilient inner layer 4. The resilient inner layer 4 consists of glass fibre reinforced synthetic plastics. The wear-resisting outer layer 5 consists of, such as, hard concrete, fused basalt or plastics with hard materials inserts as appropriate.By these means a shuttering plate is formed which as a whole is vibration-absorbing and has outstanding rigidity and wear characteristics. To instal a loose materials bunker 1 with an outer helical chute 2 by casting concrete in situ, an outer casing of panels 3 is erected as a bunker wall within the bunker shaft, a steel reinforcemellt 8 is introduced into the space between this outer casing and the shaft wall and this space is filled up with concrete cast in situ. If panels 3 such as those of the invention are used as shuttering plates then they can be left in the bunker wall as dead shuttering to form the bunker wall surface. In this connection the bunker wall surface naturally includes the surface of the outer helical chute. WHAT I CLAIM IS:

1. A loose materials bunker shuttering member, said member being formed as a panel with a resilient inner layer and a wearresistant outer layer, whereby said panel can remain as dead shuttering and form the surface of the bunker.

2. A shuttering member as in Claim 1, wherein the panel is formed as a section of a cylinder, particularly a rectangular section of a cylinder.

3. A shuttering member as in Claim 1, wherein said panel is helically formed, whereby said panel can form the surface of a helical chute built on to the bunker wall.

4. A shuttering member as in any of Claims 1 to 3, wherein the panel is provided with anchoring devices, e.g., anchoring bars, on its rear surface.

5. A shuttering member as in any of Claims 1 to 4, wherein the panel bears clamping fillets around its periphery and on its rear surface.

6. A shuttering member as in any of Claims 1 to 5, wherein an adhesive bonding layer is applied to the resilient inner layer.

7. A shuttering member as in any of Claims 1 to 6, wherein the resilient inner layer con sists of a synthetic plastics material.

8. A shuttering member as in any Claims 1 to 7, wherein the wear-resistant outer layer consists of hard concrete, plastics with hard material inserts, or fused basalt

9. A shuttering member as in any of Claims 6 to 8, wherein the adhesive bonding layer consists of synthetic plastics cement

10. A shuttering member as in any of Claims 1 to 6, wherein the inner and outer layers are formed from the same resilient yet hard wearing material such as cement strengthened by fibres, or of concrete impregnated with polymers.

11. A shuttering member as in Claim 10, wherein the fibres consist of poylpropylene, polyamide, carbon, glass, preferably alkali- resistant glass, or steeL

12. A shuttering member as in Claim 10 or Claim 11, wherein methyl methacrylate is employed as polymer.

13. A shuttering member for a loose materials bunker substantially as hereinbefore described with reference to the accompanying drawing.