Riprap separation apparatus and method

• US 4,998,625 A
• Filed: 10/21/1988
• Issued: 03/12/1991
• Est. Priority Date: 10/21/1988
• Status: Expired due to Fees

• Current Assignee: Nordberg-Read, Inc. (Metso Corporation)
• Original Assignee: Read Corporation
• Inventors: Read, James L.
• Primary Examiner(s): Focarino, Margaret A.
• Assistant Examiner(s): Wacyra, Edward M.
• Application Number:
  US07/260,592
• Time in Patent Office: 872 Days
• Field of Search: 209/234, 209/235, 209/240, 209/241, 209/243, 209/244, 209/255, 209/260, 209/341, 209/352, 209/370, 209/379, 209/409, 209/412, 209/420, 209/421, 209/44.1, 209/629 , 209/632, 209/633, 209/634, 209/659, 209/675, 414/376
• US Class Current: 209/234
• CPC Class Codes: B07B 1/28 Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
• CPC Class Codes: B07B 1/46 Constructional details of screens in general; Cleaning or heating of screens
• CPC Class Codes: B07B 9/00 Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets

Abstract

A riprap separation apparatus and method which riprap apparatus comprises a frame having an open space within the frame, an upper grizzly section composed of a tiltable upper grizzly section having a plurality of fixed, spaced apart bar elements so that riprap material discharged onto the grizzly section is separated into a large size material and a smaller size material which passes through the bar elements and a downwardly angled discharge chute to receive the larger size material and to deposit the large size material to one side of the apparatus. The apparatus includes a support section disposed to be within an earthen sloped access ramp to provide support for the apparatus and with the ramp to provide for the movement of vehicles to discharge riprap material into the grizzly section. The separation apparatus includes a soil separating apparatus within the open space of the frame to receive the smaller size riprap material and to separate the smaller size riprap into an intermediate size material to be deposited to other side of the separation apparatus and a finer size material within the open space and beneath the soil separating apparatus.

Claims

1. A separation apparatus which apparatus comprises in combination:

(a) a support frame having a front, back and one and the other sides, with at least one side of said apparatus open to provide an open internal space within the support frame;

(b) an upper grizzly element on the top of the support frame having a one and other end, which grizzly element comprises;

(i) a first receiving hopper means to receive riprap-type material to be separated;

(ii) a plurality of generally parallel, spaced apart, horizontally fixed bar elements extending from the front toward the back of the support frame to separate the received riprap into the first large riprap material which does not pass through the spaces of the bar elements and small riprap material which passes through the spaces of the bar elements;

(c) means to tilt the grizzly element about an axis at the one end between a horizontal position and an upright angle of about 75°

to aid in the removal of the first large riprap material from the surface of the bar elements by angular movement of the bar elements of the grizzly element and to provide an angular sloping surface for the discharge of the first large riprap material;

(d) a downwardly angled discharge ramp means adjacent the one end of the grizzly element and adapted to receive the first large riprap material from the grizzly bar elements and to discharge said large riprap material form the discharge ramp means into a separated first large riprap material of defined size on the ground adjacent the back of the support frame;

(e) a second receiving hopper means within the open space of the support frame to direct the small riprap material passing through the upper grizzly element on a defined downward path in said open space;

(f) support means to provide for attachment to a sloping earthen ramp means adjacent the apparatus;

(g) a sloping earthen ramp means to provide an angled ramp for the movement of vehicles and extending up to the first receiving hopper means to permit the discharge of riprap material from said vehicles directly into the first receiving hopper means; and

(h) screen-type soil separating means within the said open space to receive said small riprap material from the second hopper means and to separate the small riprap material into a second riprap material and a third riprap material of defined sizes, the third material deposited and separated and reachable for the removal within the said open space and beneath the screen-type soil separating means, and the second material separately deposited and separated outside of the separation apparatus thereby providing an apparatus for the separation of the riprap material into at least three distinct, classified, separate materials.

2. The apparatus of claim 1 wherein the means to tilt includes a hydraulic means to permit the movement of the upper grizzly element about the axis between defined angular positions.

3. The apparatus of claim 1 wherein the support means comprises a plurality of generally horizontal, spaced apart, outwardly extending supporting bars and wherein the ramp means surrounds and emcompasses the supporting bars.

4. The apparatus of claim 1 wherein the screen-type soil separating means comprises a screening apparatus having a pair of spaced apart, angled upper and lower shaker screens, each of defined screening capacity, to receive the said small riprap material and to screen and separate the small riprap material into a separate pile of third material beneath the shaker screens and subject to removal from beneath the shaker screens and into a separate pile of second material outside of the screen-type separating means and adjacent to one or the other side of the separation apparatus.

5. The apparatus of claim 4 wherein the second receiving hopper means includes angled hopper surfaces extending inwardly and downwardly to receive the small riprap material and to direct the small riprap material onto the upper shaker screen of the soil separating means.

6. The apparatus of claim 1 wherein the first receiving hopper means comprises upright, outwardly angled hopper surfaces extending from the one and other sides of the support frame.

7. The apparatus of claim 1 wherein the angled discharge ramp means comprises a solid discharge surface extending from about the

8. A separation apparatus which apparatus comprises in combination:

(a) a support frame having a front, back and one and the other sides, with at least one side of said apparatus open to provide an open internal space within the support frame;

(b) an upper grizzly element on the top of the support frame having a one and other end, which grizzly element comprises;

(i) a first receiving hopper means to receive riprap-type material to be separated and which comprises upright, outwardly angled hopper surfaces extending from the one and other sides of the support frame;

(ii) a plurality of generally parallel, spaced apart, horizontally fixed bar elements extending from the front toward the back of the support frame to separate the received riprap into first large riprap material which does not pass through the spaces of the bar elements and small riprap material which passes through the spaces of the bar elements;

(c) hydraulic means to tilt the grizzly element about an axis at the one end between a horizontal position and an upright angle of about 75°

to aid in the removal of the first large riprap material from the surface of the bar elements by angular movement of the bar elements of the grizzly element and to provide an angular sloping surface for the discharge of the first large riprap material;

(d) a downwardly angled discharge ramp means adjacent the one end of the grizzly element and having a solid discharge surface which extends from the one end to the back of the support frame and adapted to receive the first large riprap material from the grizzly bar elements and to discharge said large riprap material from the discharge ramp means into a separated first large riprap material of defined size on the ground adjacent the back of the support frame;

(e) a second receiving hopper means within the open space of the support frame which comprises downwardly, inwardly angled hopper surfaces extending from the one and other side of the support frame to direct the small riprap material passing through the upper grizzly element on a defined downward path in said open space;

(f) bar support means extending outwardly from the support frame;

(g) a sloping earthen ramp means which surrounds and encompasses the bar support means to provide an angled ramp for the movement of vehicles so that the vehicles may discharge riprap material to be separated into the first receiving hopper means of said apparatus; and

(h) screen-type soil separating means within the said open space to receive said small riprap material from the second hopper means and to separate the small riprap material into a second riprap material and a third riprap material of defined sizes, the third material deposited and separated and reachable for the removal within the said open space and beneath the screen-type soil separating means, and the second material separately deposited and separated outside of the separation apparatus thereby providing an apparatus for the separation of the riprap material into at least three distinct, classified, separate materials.

9. A method of separating riprap material into three, separate, distinctly sized, classified solid material, which method comprises:

(a) providing a sloping earthen ramp means for the movement of vehicles carrying riprap material to be separated;

(b) discharging the riprap material from vehicles using the ramp means directly into a first receiving section of a riprap separation apparatus having a support frame surrounding an internal open space and a tiltable upper grizzly section disposed on the support frame, and the grizzly section composed of a plurality of spaced apart, fixed bar elements at a tiltable angle to the ground to provide for the passage of small riprap material through the bar elements downwardly and the retention of first large riprap material;

(c) discharging the large riprap material from the angled surface of the bar elements outside of said frame as a first riprap material;

(d) adjustably tilting at a defined angle the grizzly section to aid in discharging large size riprap material from the surface of the bar elements and to inhibit the retention of riprap material between the bar elements;

(e) directing the downwardly flowing small riprap material from the grizzly section into a screen-type soil screening apparatus within the said open space and comprising at least two spaced apart, angled, upper and lower shaker screens;

(f) separating the small riprap material into a third material by passing the material downwardly through the upper and lower shaker screens into the said open space; and

(g) discharging from the angled, upper shaker screen outside of the soil screening apparatus a second material which fails to pass through the shaker screen, thereby providing for classification of the riprap material into three separate, distinct size classified materials.

10. The method of claim 9 which includes separating riprap material into a first riprap material of greater than about 12" in size, to a second material between about 6" and 18" in size and a third material of less than about 6" in size.

11. The method of claim 9 which includes tilting the grizzly section at an angle from about 20°

to 75°

from horizontal.

12. The method of claim 9 which includes discharging the first large riprap material from the upper grizzly section onto an adjacent, downwardly angled discharge ramp and into a segregated pile of the first large riprap material outside of the support frame.

13. The method of claim 9 which includes securing the riprap separation apparatus to the sloping earthen ramp means.

14. The method of claim 13 which includes securing the riprap separation apparatus to the ramp means by surrounding support bars extending from the riprap separation apparatus with the earth of the ramp means.