CN109490055B - Mold for manufacturing simulated rock mass structural plane and use method thereof - Google Patents
Mold for manufacturing simulated rock mass structural plane and use method thereof Download PDFInfo
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- CN109490055B CN109490055B CN201811213514.XA CN201811213514A CN109490055B CN 109490055 B CN109490055 B CN 109490055B CN 201811213514 A CN201811213514 A CN 201811213514A CN 109490055 B CN109490055 B CN 109490055B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
The invention discloses a mould for manufacturing a simulated rock mass structural plane and a using method thereof, belonging to the technical field of engineering, wherein the mould comprises a second mould for manufacturing a simulated rock mass structural plane sample and a first mould for manufacturing a rock mass structural plane template; the first mould comprises an outer mould box and an inner mould box which are vertically communicated and matched with each other, a first lifting support used for lifting the outer mould box is arranged at the bottom of the outer mould box, a steel needle row is seamlessly filled in a gap between the outer mould box and the inner mould box, and an elastic knob used for adjusting the filling gap degree of the steel needle row is arranged on the outer mould box. The method realizes that the cement mortar and other similar materials are directly poured on the rock mass structural surface to manufacture the simulated rock mass structural surface template with the regular shape, omits the process of manufacturing the natural rock mass structural surface template by cutting processing, solves the problem that the structural surface is damaged when cutting the natural rock mass, and ensures that the simulated rock mass structural surface is manufactured more simply, conveniently and quickly.
Description
Technical Field
The invention belongs to the technical field of engineering, and particularly relates to a mold for manufacturing a simulated rock mass structural plane and a using method thereof.
Background
Because the natural rock mass structural plane with completely consistent surface appearance is difficult to collect and the naturally anastomotic rock mass structural plane is also difficult to obtain, in order to research the shearing resistance of the rock mass structural plane with the same appearance characteristic under different normal stresses, a plurality of students often adopt artificial simulation rock mass structural planes for experimental research. At present, the method for manufacturing the artificial simulated rock structural plane sample which is widely adopted can be briefly described as follows: firstly, cutting a rock mass structural plane to be copied to enable the projection of the structural plane on a shearing plane (shearing test) to be in regular shapes such as rectangle and circle so as to obtain a rock mass structural plane template; then, pouring cement mortar or gypsum and other similar materials on the rock mass structure surface template to manufacture an artificial simulated rock mass structure surface template; and finally, pouring cement mortar or gypsum and other similar materials on the artificial simulated rock mass structural surface template to form a completely-matched artificial simulated rock mass structural surface sample.
Aiming at the research of the shearing property of the rock mass structural plane, the projection of the structural plane on the shearing plane is mostly in the shape of a rectangle or a circle with an equal rule, so that in the existing manufacturing method of the simulated rock mass structural plane, the rock mass structural plane to be copied needs to be cut into the shape of the rectangle with the equal rule to manufacture a rock mass structural plane template. In addition, the natural rock mass structural plane with weak lithology is easy to be damaged in the cutting process. Therefore, when the natural rock structural surface is weak in lithology, the natural rock structural surface is not easy to be made into a regular rock structural surface template.
In summary, although the conventional method for manufacturing the simulated rock mass structural plane can realize the manufacture of the matched simulated rock mass structural plane sample, the method still has certain defects. The more simple, convenient, rapid and generally applicable mold (method) for manufacturing the simulated rock mass structural plane is urgently needed to be further researched and developed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a mould for manufacturing a simulated rock mass structural plane and a using method thereof, which realize that similar materials such as cement mortar and the like are directly poured on the rock mass structural plane to manufacture a simulated rock mass structural plane template with a regular shape, omit the process of manufacturing a natural rock mass structural plane template by cutting and processing, solve the problem that the structural plane is damaged when a natural rock mass is cut, and enable the manufacture of the simulated rock mass structural plane to be simpler, more convenient and quicker.
The technical scheme adopted by the invention for realizing the purpose is as follows: a mould for manufacturing a simulated rock mass structural plane comprises a second mould for manufacturing a simulated rock mass structural plane sample and a first mould for manufacturing a rock mass structural plane template; the first mould comprises an outer mould box and an inner mould box which are vertically communicated and matched with each other, a first lifting support used for lifting the outer mould box is arranged at the bottom of the outer mould box, a steel needle row is seamlessly filled in a gap between the outer mould box and the inner mould box, and an elastic knob used for adjusting the filling gap degree of the steel needle row is arranged on the outer mould box. The invention realizes that the first mould is directly and horizontally placed on the natural rock mass structural plane by utilizing the steel pin row between the inner mould box and the outer mould box, the height position of the inner mould box and the outer mould box relative to the steel pin row can be adjusted by utilizing the first lifting bracket, cement mortar and other similar materials are poured in the mould inner box, because the steel pin row and the rock mass structural plane form a closed space, the invention realizes that the simulated rock mass structural plane template with regular shape is directly manufactured, and then the simulated rock mass structural plane template is placed in the second mould to obtain the completely inosculated simulated rock mass structural plane sample, completely omits the process of manufacturing the natural rock mass structural plane template by cutting processing in the prior art, solves the problem that the structural plane is damaged when cutting the natural rock mass, and the device of the invention can directly obtain the completely inosculated simulated rock mass structural plane sample in any position state outdoors without being limited by the position state of the outdoor rock mass, and the rock mass does not need to be cut, so that the natural rock mass is effectively protected.
The cross-sectional shapes of the outer mold box and the inner mold box of the present invention include, but are not limited to, rectangular, circular, and polygonal.
Preferably, the top of the outer mold box and the top of the inner mold box are fixed by a top plate, and a first water level is arranged on the top plate. When first lifting support goes up and down in certain extent, cooperation first spirit level guarantees that the experimental upper and lower dish of structural plane of making is coincide, solves the condition that straight bottom surface is not parallel about two dishes, when exerting normal pressure in the testing process, causes to produce the space between the structural plane or the normal pressure of exerting produces eccentric problem.
Preferably, the steel needle bank is regular spread, and the steel needle bank comprises vertical setting and looks butt steel needle for the realization is placed the direct level of first mould on natural rock mass structural plane.
Preferably, a steel needle groove is formed in a gap between the outer die box and the inner die box, the steel needle bar is filled in the steel needle groove in a seamless mode, and an elastic knob used for adjusting the filling gap degree of the steel needle bar is arranged on the outer die box at the position, corresponding to the corner of the outer die box, of the steel needle groove. The elastic knob can realize the loading of static friction force among all the steel needles in the steel needle row, and when the elastic knob does not contact the steel needle row, all the steel needles in the steel needle row can freely lift; when the elastic knob is abutted to the steel needle row, certain static friction force exists between the steel needles, and the steel needles in the steel needle row cannot generate relative displacement under the action of self gravity. The steel needle has stronger rigidity, and when the elasticity knob applied load to the steel needle row, the steel needle does not take place deformation.
Preferably, the connection part of the elastic knob and the outer die box is provided with a threaded hole, the elastic knob is in threaded connection with the outer die box, and the elastic knob is used for loading static friction force between the steel needles in the steel needle row in a threaded connection mode.
Preferably, the second mould includes horizontal objective table, is equipped with the second spirit level on the horizontal objective table, still is equipped with the steel mould that link up from top to bottom, and box horizontal cross-section is unanimous in steel mould horizontal cross-section and the mould for the realization will simulate in the steel mould of second mould is arranged in to rock mass structural face template, and pour the simulation material on simulation structural face template, make simulation rock mass structural face sample.
Preferably, the bottom of the horizontal objective table is provided with a second lifting support for lifting the horizontal objective table, and the second lifting support is matched with a second level gauge to ensure that the upper and lower discs of the manufactured structural surface test are inosculated.
A use method of a mold for manufacturing a simulated rock mass structural plane is characterized by comprising the following steps:
1) manufacturing a simulated rock mass structural plane template: assembling a first mould, selecting a rock mass structural plane to be duplicated, placing the assembled first mould on the rock mass structural plane, adjusting the height of a first lifting support, matching with a first level, adjusting a top plate to be in a horizontal state, loosening an elastic knob to enable each steel needle in a steel needle row to freely fall and abut against the rock mass structural plane, screwing the elastic knob, pouring a simulation material into the first mould, and manufacturing a simulation rock mass structural plane template;
2) manufacturing an anastomotic simulated rock mass structural plane sample: and assembling a second mould, placing the simulated rock mass structural surface template in a steel mould of the second mould, and pouring a simulated material on the simulated structural surface template to manufacture the simulated rock mass structural surface sample.
Preferably, the process of assembling the first mold is: the outer box of the mould is sleeved outside the inner box of the mould, the tops of the two are fixed by a top plate through a first bolt, a first lifting support is arranged at four corners of the lower bottom of the outer box of the mould, a steel needle groove is filled by a vertical seamless steel needle, a steel needle row is formed by vertically arranging steel needle abutting connection on any surface of the steel needle groove, and the steel needle row is abutted by rotating an elastic knob.
Preferably, the process of assembling the second mold is: all install second lifting support at four corners of horizontal objective table lower bottom, by second lifting support cooperation second spirit level, adjust horizontal objective table and be in the horizontality, by four faces of second bolt and the fixed steel mould of second screw to be fixed in horizontal objective table with the steel mould.
Preferably, the simulation material is cement mortar or gypsum or resin.
Compared with the prior art, the invention has the beneficial effects that: the method realizes that the simulated rock mass structural face template with a regular shape can be manufactured by directly pouring cement mortar and other similar materials on the rock mass structural face, and omits the process of manufacturing the natural rock mass structural face template by cutting processing in the prior art, so that the manufacture of the simulated rock mass structural face sample is simpler, more convenient and faster. In addition, the natural rock mass structural plane with weak lithology is easy to be damaged in the cutting process, and is not easy to be made into a regular rock mass structural plane template. By applying the first mould for manufacturing the simulated rock mass structural surface template, the natural rock mass structural surface with weak lithology can be copied to manufacture the simulated rock mass structural surface.
Therefore, the invention provides the mold for manufacturing the simulated rock mass structural plane and the use method thereof, which are simpler, faster and more generally applicable.
Drawings
FIG. 1 is a schematic diagram of the operation of a first mold for making a simulated rock mass structural face template according to the present invention;
FIG. 2 is a top view of a first mold (including a top plate) for making a simulated rock mass structural face template according to the present invention;
FIG. 3 is a top view of a first mold (without a top plate and steel pins) for making a simulated rock mass structural face template according to the present invention;
FIG. 4 is a cross-sectional view of a first mold (horizontal cross-sectional view at the tightening and loosening knob) for making a simulated rock mass structural face template according to the present invention;
FIG. 5 shows the steel needles and the steel needle row according to the present invention;
FIG. 6 is a schematic diagram of a second mold for manufacturing a simulated rock mass structural plane sample according to the invention;
FIG. 7 is a schematic diagram of the operation of a second mold for producing a simulated rock mass structural plane sample according to the present invention.
Description of reference numerals: 11-a first lifting bracket; 121-mold box; 122-a mold inner box; 123-a top plate; 124-a first bolt; 125-a first screw hole; 131-a tightening knob; 132-a steel needle; 1321-single steel needle; 1322-steel needle row; 133-steel needle groove; 14-a first level; 2-structural plane of rock mass; 31-a second lifting bracket; 32-horizontal stage; 33-a second level; 34-a steel mould; 351-a second bolt; 352-second screw hole; 41-simulating a rock mass structural surface template; 42-pouring a simulated rock mass structural plane sample.
Detailed Description
The invention is further described below with reference to the figures and examples. It is to be understood that the invention is not to be limited to the following exemplary embodiments, but is to be controlled by the limitations set forth in the claims and any equivalents thereof.
As mentioned above, the invention is suitable for preparing the simulated rock mass structural plane with different shapes such as round, rectangular and the like projected on the shearing plane, and the specific size of the simulated rock mass structural plane can be determined according to the experimental design. The mold for producing the simulated rock mass structural plane and the method of using the same according to the present invention will be described below by taking only a simulated rock mass structural plane whose projection on the shear plane is a square (side length is 100 mm) as an example.
Example 1:
as shown in fig. 1-7, a mold for making a simulated rock mass structural plane comprises a first mold for making a template of the simulated rock mass structural plane and a second mold for making a sample of the simulated rock mass structural plane.
The first mold for manufacturing the simulated rock mass structural face template mainly comprises a first lifting bracket 11, an outer mold box 121, an inner mold box 122, a top plate 123, a steel pin 132, a steel pin groove 133 and a first level 14. The outer mold box 121 and the inner mold box 122 are rectangular frames with two bottoms (the bottoms are square) removed. The outer mold box 121 is sleeved outside the inner mold box 122, and the tops of the two are fixed by a top plate 123 through a first bolt 124. The gap between the fixed inner mold box 122 and the outer mold box 121 is the steel needle groove 133. Two first levels 14 are vertically disposed on the top plate. The four corners of the lower bottom of the outer mold box 121 are provided with first lifting brackets 11. The first lifting bracket 11 can be lifted within a certain range, and the top plate 123 can be adjusted to be in a horizontal state by matching with the first level 14. The steel needle 132 is a cuboid, and the length, width and height of the steel needle are respectively 2 mm, 2 mm and b mm (the value of b can be set according to the thickness of the simulated rock mass structure face template). The 52 steel needles 132 are vertically arranged on the same plane and are abutted to form a steel needle row 1322, and the length, the width and the height of the steel needle row are respectively 2 mm, 104 mm and b mm. The steel needle groove 133 is seamlessly filled with four steel needle bars 1322, and each steel needle bar 1322 filled in the steel needle groove 133 has both ends abutting against the mold outer case 121. At the end of the steel pin header 1322 abutting against the mold outer case 121, a screw hole is provided in the mold outer case 121, and a bolt (i.e., an elastic knob 131) is engaged with the screw hole to apply a force to the steel pin header. The elastic knob 131 can realize the loading of static friction force between the steel needles in the steel needle row 1322, and when the elastic knob 131 does not contact the steel needle row 1322, the steel needles in the steel needle row 1322 can freely lift and fall; when the elastic knob 131 abuts against the steel needle row 1322 to enable a certain static friction force to exist between the steel needles, the steel needles in the steel needle row 1322 cannot generate relative displacement under the action of self gravity. The steel needle 132 has a strong rigidity, and when the elastic knob 131 applies a load to the steel needle row 1322, the steel needle 132 is not deformed.
The second mould for manufacturing the simulated rock mass structural plane sample mainly comprises a second lifting bracket 31, a horizontal stage 32, a second level 33 and a steel mould 34. The horizontal stage 32 is made of steel plate, and the four corners of the lower bottom of the horizontal stage are provided with second lifting brackets 31. The second elevating bracket 31 is matched with the second level 33, and the horizontal stage 32 can be adjusted to be in a horizontal state. The steel mold 34 is a rectangular frame with two bases removed (the base is square), and the inner side length of the square section of the rectangular frame is 2 × (52-2) =100 mm. The four faces of the steel mold 34 are fixed to the second screw holes 352 by the second bolts 351.
The invention realizes that the first mould is directly and horizontally placed on the natural rock mass structural plane by utilizing the steel pin row 1322 between the inner mould box and the outer mould box, the height position of the inner mould box and the outer mould box relative to the steel pin row 1322 can be adjusted by utilizing the first lifting bracket 11, cement mortar and other similar materials are poured in the mould inner box 122, because the steel pin row 1322 and the rock mass structural plane form a closed space, the method realizes that the simulated rock mass structural plane template with regular shape is directly manufactured, and then the simulated rock mass structural plane template is placed in the second mould to obtain the completely inosculated simulated rock mass structural plane sample, completely omits the process of manufacturing the natural rock mass structural plane template by cutting processing in the prior art, solves the problem that the structural plane is damaged when cutting the natural rock mass, and the device of the invention can directly obtain the completely inosculated simulated rock mass structural plane sample in any position state outdoors without being limited by the position state of the outdoor rock mass, and the rock mass does not need to be cut, so that the natural rock mass is effectively protected.
Example 2:
the invention discloses a using method of a mold for manufacturing a simulated rock mass structural plane, which comprises the following steps:
(1) assembling and manufacturing a first mould for simulating a rock mass structural face template: the outer mold box 121 is sleeved outside the inner mold box 122, and the tops of the two are fixed by a top plate 123 through a first bolt 124. The first lifting brackets 11 are installed at four corners of the lower bottom of the mold outer box 121. The length, width and height of the steel needle 132 are respectively 2 mm, 2 mm and b mm, and the steel needle groove 133 is vertically and seamlessly filled with the steel needle 132. 52 steel needles are vertically arranged on any surface of the steel needle groove 133 and are abutted and arranged to form a steel needle row 1322, and the length, the width and the height of the steel needle row are respectively 2 mm, 104 mm and b mm. The tightening knob 131 is rotated to abut against the steel needle row 1322, so that the steel needles 132 in each steel needle row cannot be relatively displaced by their own weight.
(2) Manufacturing a simulated rock mass structural plane template: and selecting a rock mass structural plane 2 to be duplicated, and placing a first mould for manufacturing a simulated rock mass structural plane template. The height of the first lifting bracket 11 is adjusted to match the first level 14, and the top plate 123 is adjusted to be in a horizontal state. The tightening knob 131 is rotated to prevent the tightening knob from contacting the steel pin row 1322, and when each steel pin in the steel pin row 1322 falls freely and abuts against the rock mass structural plane 2, the tightening knob 131 is rotated again to abut against the steel pin row 1322, so that the steel pins in each steel pin row 1322 cannot be displaced relatively. The rock mass structural plane determined by the four steel pin rows 1322 of the first die is the range of the rock mass structural plane to be copied, and the horizontal projection of the rock mass structural plane is a square with the side length of 100 mm. And further pouring similar materials such as cement mortar and the like into the first mold to manufacture the simulated rock mass structural face template 41 (when pouring the similar materials such as cement mortar and the like, the upper bottom of the simulated rock mass structural face template is ensured to be in a horizontal state, and the thickness of the simulated rock mass structural face template is determined according to the test requirements). The similar materials such as cement mortar to be poured are hardened (solidified), the first mould is disassembled and cleaned, and the manufactured simulated rock mass structure face template 41 is taken out.
(3) Assembling a second mould for simulating a rock mass structural plane sample: the second lifting support 31 is arranged at four corners of the bottom of the horizontal objective table. The second elevating bracket 31 is matched with the second level gauge 33 to adjust the horizontal stage 32 to be in a horizontal state. The specification steel mold 34 is fixed on four surfaces thereof by second bolts 354 and second screw holes 352, and the steel mold 34 (inner side length 100 mm) is fixed on the horizontal stage 32.
(4) Manufacturing an anastomotic simulated rock mass structural plane sample: and (3) placing the simulated rock mass structural surface template 41 manufactured in the step (2) in a steel mould 34 of a second mould, and pouring similar materials such as cement mortar and the like on the simulated structural surface template 41, namely pouring the simulated rock mass structural surface sample 42. And hardening (solidifying) the similar materials such as cement mortar to be poured, disassembling and cleaning the second mould, and taking out the manufactured simulated rock mass structural plane. Similarly, the thickness of the poured simulated rock mass structural plane specimen 42 is determined according to the test requirements.
Conventional operations in the operation steps of the present invention are well known to those skilled in the art and will not be described herein.
The technical solutions of the present invention are described in detail in the above embodiments, it should be understood that the above embodiments are only specific examples of the present invention, and are not intended to limit the present invention, and any modification, supplement or similar substitution made within the scope of the principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a mould of preparation simulation rock mass structural plane, is including the second mould that is used for making simulation rock mass structural plane sample, its characterized in that: the first mould is used for manufacturing the rock mass structure face template;
the first mould comprises an outer mould box (121) and an inner mould box (122) which are arranged in a vertically through matching mode, a first lifting support (11) used for lifting the outer mould box (121) is arranged at the bottom of the outer mould box (121), a steel needle row (1322) is seamlessly filled in a gap between the outer mould box (121) and the inner mould box (122), and an elastic knob (131) used for adjusting the filling gap degree of the steel needle row (1322) is arranged on the outer mould box (121); the tops of the outer mold box (121) and the inner mold box (122) are fixed by a top plate (123), and a first level (14) is arranged on the top plate (123); the steel needle rows (1322) are regularly arranged, and the steel needle rows (1322) are composed of vertically arranged and abutted steel needles (132); a steel needle groove (133) is formed in a gap between the outer die box (121) and the inner die box (122), the steel needle row (1322) is seamlessly filled in the steel needle groove (133), and a tightness knob (131) used for adjusting the filling gap degree of the steel needle row (1322) is arranged on the outer die box (121) at the position, corresponding to the corner of the outer die box (121), of the steel needle groove (133); the connection part of the elastic knob (131) and the outer die box (121) is provided with a threaded hole, and the elastic knob (131) is in threaded connection with the outer die box (121).
2. The mold for making the simulated rock mass structural plane according to claim 1, wherein: the second mould includes horizontal objective table (32), be equipped with second spirit level (33) on horizontal objective table (32), still be equipped with steel mould (34) that the top and bottom link up, box (122) horizontal cross-section is unanimous in steel mould (34) horizontal cross-section and the mould.
3. A mould for making a simulated rock mass structural plane according to claim 2, wherein: and a second lifting support (31) used for lifting the horizontal object stage (32) is arranged at the bottom of the horizontal object stage (32).
4. The use method of the mould for manufacturing the simulated rock mass structural plane as claimed in claim 3 is characterized by comprising the following steps:
1) manufacturing a simulated rock mass structural plane template: assembling a first mould, selecting a rock mass structural plane (2) to be copied, placing the assembled first mould on the rock mass structural plane (2), adjusting the height of the first lifting support (11), matching with the first level (14), adjusting the top plate (123) to be in a horizontal state, loosening the tightening knob (131) to enable each steel needle in the steel needle row (1322) to freely fall and abut against the rock mass structural plane (2), tightening the tightening knob (131), pouring a simulation material into the first mould, and manufacturing a simulation rock mass structural plane template (41);
2) manufacturing an anastomotic simulated rock mass structural plane sample: and assembling a second mould, placing the simulated rock mass structural surface template (41) in a steel mould (34) of the second mould, and pouring a simulated material on the simulated structural surface template (41) to manufacture a simulated rock mass structural surface sample (42).
5. The use method of the mold for manufacturing the simulated rock mass structural plane according to claim 4, is characterized in that: the first die assembling process comprises the following steps: sleeving an outer mould box (121) outside the inner mould box (122), fixing the tops of the outer mould box and the inner mould box by a top plate (123) through a first bolt (124), installing first lifting supports (11) at four corners of the lower bottom of the outer mould box (121), vertically filling the steel needle grooves (133) by the steel needles (132) in a seamless manner, vertically arranging the steel needles on any surface of the steel needle grooves (133) to be abutted and arranged to form a steel needle row (1322), and rotating an elastic knob (131) to abut against the steel needle row (1322); the process of assembling the second die comprises the following steps: and second lifting brackets (31) are arranged at four corners of the lower bottom of the horizontal object stage, the second lifting brackets (31) are matched with the second levels (33) to adjust the horizontal object stage (32) to be in a horizontal state, the four surfaces of the steel mould (34) are fixed by second bolts (354) and second screw holes (352), and the steel mould (34) is fixed on the horizontal object stage (32).
6. The use method of the mold for manufacturing the simulated rock mass structural plane according to claim 4, is characterized in that: the simulation material is cement mortar or gypsum or resin.
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| CN110702536B (en) * | 2019-10-25 | 2022-04-19 | 安徽建筑大学 | Rock mass structural plane shear failure surface morphology evolution law research method and system |
| CN113866033B (en) * | 2021-09-24 | 2023-08-01 | 广西大学 | Device and method for manufacturing rigid structural surface with arbitrary filling thickness in stress environment |
| CN114910626B (en) * | 2022-05-13 | 2023-08-15 | 山东科技大学 | Model test device and method based on basic mosaic unit |
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