CN114851270A - LS composite insulation board cutting construction method - Google Patents
LS composite insulation board cutting construction method Download PDFInfo
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- CN114851270A CN114851270A CN202210520300.7A CN202210520300A CN114851270A CN 114851270 A CN114851270 A CN 114851270A CN 202210520300 A CN202210520300 A CN 202210520300A CN 114851270 A CN114851270 A CN 114851270A
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- Prior art keywords
- cutting
- insulation board
- composite insulation
- construction method
- tank
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- 238000005520 cutting process Methods 0.000 title claims abstract description 104
- 238000009413 insulation Methods 0.000 title claims abstract description 69
- 239000002131 composite material Substances 0.000 title claims abstract description 63
- 238000010276 construction Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000010865 sewage Substances 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 8
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 239000000779 smoke Substances 0.000 abstract description 2
- 238000004062 sedimentation Methods 0.000 description 26
- 230000001681 protective effect Effects 0.000 description 6
- 239000000428 dust Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000000151 deposition Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920006389 polyphenyl polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
- B26D1/14—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
- B26D1/157—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a movable axis
- B26D1/18—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a movable axis mounted on a movable carriage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/01—Means for holding or positioning work
- B26D7/02—Means for holding or positioning work with clamping means
- B26D7/025—Means for holding or positioning work with clamping means acting upon planar surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/27—Means for performing other operations combined with cutting
- B26D7/32—Means for performing other operations combined with cutting for conveying or stacking cut product
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/24—Structural elements or technologies for improving thermal insulation
- Y02A30/244—Structural elements or technologies for improving thermal insulation using natural or recycled building materials, e.g. straw, wool, clay or used tires
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a LS composite insulation board cutting construction method, and relates to the technical field of LS composite insulation board cutting. The method is simple to operate and high in cutting speed, reduces the external wall heat-insulation construction procedures, reduces the construction cost and reduces the labor cost; secondary cutting and repairing are avoided, and the hidden danger of water seepage of the outer wall is eliminated; reduces smoke pollution and creates a green and environment-friendly construction environment.
Description
Technical Field
The invention relates to the technical field of LS composite insulation board cutting, in particular to a LS composite insulation board cutting construction method.
Background
In the present building engineering, the external wall insulation board adopts rock wool or polyphenyl board complex form more, and LS composite insulation board has that thermal insulation performance is good, fire behavior is good, characteristics such as hydrophobicity are strong, and LS composite insulation board has reduced template use amount and follow-up external wall insulation construction work load, reduces hanging flower basket eminence operation safety risk. LS composite insulation board need be cut according to the actual use demand in the use.
In the construction process, the hand saw for cutting the LS composite board external wall insulation board is too slow in construction, the insulation board is cut straightly according to the required size by adopting an electric hand-held combination leaning bar, the cutting quality is difficult to control, the secondary cutting is needed to adjust when the hand saw is used, the potential safety hazard is large, the working efficiency is low, and the construction is inconvenient; and the heated board is difficult to fix when the cutting, leads to the cutting deviation easily, influences later stage construction. And a large amount of dust is generated in the cutting process, so that the health of operators is influenced, and the environment is polluted.
Disclosure of Invention
In order to solve the technical problem, the invention provides a LS composite insulation board cutting construction method, which reduces secondary cutting and transportation, and reduces dust pollution by adding a spraying system in the cutting process.
In order to realize the technical purpose, the invention adopts the following scheme:
the LS composite insulation board cutting construction method comprises the following steps:
step one, composing an LS composite insulation board: determining a typesetting and dividing scheme according to the size of the outer wall and drawing an installation layout;
step two, snapping a line: checking the size of the LS composite insulation board before installation according to a design drawing and a typesetting drawing, designing an installation control line, and popping up the installation control line of each board;
step three, carrying and cutting: carrying the LS composite insulation board by using hoisting equipment, placing the LS composite insulation board on a cutting platform of a cutting frame body, wherein the position of a cutting line is vertical to a cutting saw; the LS composite insulation board is fastened and fixed, so that the cutting process is prevented from moving; starting the cutting equipment and starting the spraying structure at the same time, slowly pushing the cutting equipment to move from one end to the other end, closing the equipment after cutting, resetting the cutting equipment, and carrying the cut composite insulation board to a specified place for stacking;
step four, installing a hoisting piece: drilling holes on the LS composite insulation board to serve as hoisting holes;
step five, erecting the LS composite insulation board: when the LS composite insulation board is hoisted, the surface with larger mortar thickness is the lower surface, and the LS composite insulation board is installed at a preset position after being hoisted for coarse positioning.
Compared with the prior art, the invention has the beneficial effects that: the method is simple to operate and high in cutting speed, reduces the external wall heat-insulation construction procedures, reduces the construction cost and reduces the labor cost; secondary cutting and repairing are avoided, and the hidden danger of water seepage of the outer wall is eliminated; reduces smoke pollution and creates a green and environment-friendly construction environment.
The preferred scheme of the invention is as follows:
a sliding groove is fixed on the upper portion of the cutting frame body, a pulley is arranged on the cutting device, and the pulley rolls in the sliding groove to drive the cutting device to move from one end of the cutting frame body to the other end of the cutting frame body.
The spraying structure comprises a spray head, a water pump and a storage tank, the spray head is installed on the side of the cutting saw, the water outlet direction of the spray head is aligned to the cutting position, the spray head is connected with the water pump, and the water pump is communicated with the storage tank.
And the LS composite insulation board is installed in a staggered joint mode when being typeset, and an upper through joint and a lower through joint are strictly forbidden.
The spraying structure below is provided with the sewage recovery structure, and the sewage recovery structure includes collecting pit, filter screen and sedimentation tank, and the collecting pit is fixed on the cutting support body of cutting mechanism below, has laid the filter screen in the collecting pit, and collecting pit and sedimentation tank intercommunication, sedimentation tank and storage tank link to each other, and the sewage after will filtering is recycled.
Drawings
Fig. 1 is a schematic front view structural diagram of a cutting device for an LS composite insulation board according to an embodiment of the present invention;
fig. 2 is a schematic side view of a cutting device for an LS composite insulation board according to an embodiment of the present invention;
fig. 3 is a schematic top view structural diagram of a cutting device for an LS composite insulation board according to an embodiment of the present invention;
labeled as: 1. cutting the frame body; 11. a chute; 2. a protective cover; 21. a spray head; 22. a hand-held wand; 3. a circular saw; 31. a motor; 4. a plate block; 41. a pulley; 5. a collection tank; 51. a filter screen; 52. an overflow pipe; 6. a sedimentation tank.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention, but the present invention is not limited thereto.
The invention provides a LS composite insulation board cutting construction method which is carried out by using a LS composite insulation board cutting device, and please refer to fig. 1 to 3.
LS composite insulation board's cutting device comprises cutting support body 1, spout 11, cutting mechanism, spray structure and sewage recovery structure etc. and cutting support body 1 is cuboid frame structure, and the spout 11 that a set of level set up is transversely fixed on the upper portion of cutting support body 1, and 11 end fixing of spout have the shutoff, and the section of spout 11 is concave structure, and spout 11 is as cutting mechanism's walking track. The middle part of cutting support body 1 is fixed with cutting platform, and cutting platform is used for placing panel, sets up rectangular shape cutting passageway on the cutting platform, and the cutting passageway is used for cutting mechanism to pass through.
The cutting mechanism comprises a plate 4, a pulley 41, a circular saw 3, a protective cover 2, a motor 31, a handheld rod 22 and the like, wherein rolling pulleys 41 which are symmetrically arranged are installed on the lower end face of the plate 4, and the pulley 41 rolls in the chute 11 to drive the cutting mechanism to travel. The lower end face of the plate 4 is connected with the motor 31 through a connecting rod, an output shaft of the motor 31 is connected with the circular saw 3, the protective cover 2 is erected above the circular saw 3, and the circular saw 3 is rotatably connected in the protective cover 2. The upper part of the protective cover 2 is fixedly connected with the plate 4, the outer side wall of the protective cover 2 is fixed with a handheld rod 22, and the handheld rod 22 is pushed to drive the cutting mechanism to move forwards.
The tip of protection casing 2 is provided with sprays the structure, sprays the structure and comprises shower nozzle 21, first water pump, storage tank etc. and the tip inner wall of protection casing 2 is fixed with the shower nozzle 21 of slope setting, and the cutting point position of saw bit and panel contact is faced towards in the water spray direction of shower nozzle 21. The spray head 21 is connected with a first water pump through a hose, and the first water pump is connected with the storage tank through a pipeline.
The storage tank links to each other with sewage recovery structure, and sewage recovery structure is located cutting platform's below. The sewage recovery structure comprises collecting pit 5, filter screen 51 and sedimentation tank 6 etc. and collecting pit 5 is located cutting support body 1 of cutting mechanism below, and the fixed one deck detachable filter screen 51 of the up end of collecting pit 5 mainly used filters the impurity of big granule. An overflow port is formed in the side wall of the collecting tank 5 on the lower side of the filter screen 51, an overflow pipe 52 is connected to the overflow port, and the overflow pipe 52 extends into the sedimentation tank 6 and is communicated with the sedimentation tank 6. The collecting tank 5 plays a role in collecting sewage, preliminarily removing and depositing large-particle impurities, and the settling tank 6 plays a role in depositing fine-particle impurities.
The sedimentation tank 6 is a three-stage sedimentation filter tank, the upper part of the sedimentation tank 6 is a first sedimentation filter tank 61, the overflow pipe 52 extends into the bottom of the first sedimentation filter tank 61, and the side wall of the first sedimentation filter tank 61 is lower than the position of an overflow port and is used for overflowing and conveying primary sedimentation clear liquid downwards. The middle part of the sedimentation tank 6 is provided with a second sedimentation filter tank 62, a gap is reserved between the side wall of the second sedimentation filter tank 62 and the first sedimentation filter tank 61 and is used for overflowing and downwards conveying secondary sedimentation clear liquid to a third sedimentation filter tank 63, and the third sedimentation filter tank 63 is positioned at the lower part of the sedimentation tank 6. An outlet is formed in the side wall of the upper part of the third precipitation filter tank 63 and is connected with a second water pump. The second water pump links to each other with the water inlet of storage tank, and the inlet department of storage tank installs the floater governing valve, and when the water level was lower in the storage tank, open the floater governing valve, impound in the automatic storage tank. Sedimentation tank 6 is fixed in the cutting support body 1 behind collecting pit 5, and preferably, sedimentation tank 6 is the box structure of dismantling the upper cover, and the blowoff valve is seted up to sedimentation tank 6's bottom, regularly clears up sedimentation tank 6's deposit filth.
The LS composite insulation board cutting construction method comprises the following steps:
step one, composing an LS composite insulation board: the typesetting separation scheme is determined according to the size of the outer wall, the installation layout is drawn, the whole plate with large specification is adopted as much as possible, splicing is reduced, the construction difficulty is considered, and the LS composite insulation board is not suitable for being too small in specification and size. And the heat-insulating plates are installed at the staggered joints during typesetting, and the upper and lower through joints are strictly forbidden.
Step two, snapping a line: before the LS composite insulation board is installed, dimensions are rechecked according to a design drawing and a typesetting drawing, an installation control line is designed, and the installation control line of each LS composite insulation board is popped up.
Step three, carrying and cutting: when in transportation, the LS composite insulation board is placed on a layer of cutting platform with the aid of equipment such as a tower crane and the like, and the cutting line position of the LS composite insulation board is perpendicular to a cutting saw, namely a circular saw 3; the LS composite insulation board is fastened and fixed, and the LS composite insulation board is prevented from moving in the cutting process. The cutting mechanism is started, the spraying structure is started at the same time, and an operator slowly pushes the cutting mechanism to move towards the other end. And after the cutting is finished, closing the equipment, resetting the cutting equipment, carrying the cut LS composite insulation board to a specified place and stacking the LS composite insulation board, and performing cutting by analogy.
Step four, installing a hoisting piece: and the upper part of the LS composite heat-insulation plate is provided with a hoisting hole, and if no hoisting hole exists, a gun drill is used for perforating the LS composite heat-insulation template on a construction site to be used as the hoisting hole.
Step five, erecting the LS composite insulation board: when the LS composite insulation board is hoisted, the surface with larger mortar thickness of the LS composite insulation board is arranged below the mortar. And the LS composite insulation board is lifted and then placed at a preset position for rough positioning.
By using the method, secondary cutting and transporting of the LS composite insulation board are reduced, and outer wall repairing is not needed, so that the waterproof property of the outer wall is improved; the spraying structure plays a good role in dust fall in the cutting process, the sewage is recycled by the sewage recycling structure, water resources are saved, the construction cost is reduced, environmental pollution caused by direct discharge of sewage is avoided, and the environment-friendly construction concept is met; and a hoisting piece is added in the cutting and hoisting process, so that the manpower output is reduced, and the manual labor is saved.
Finally, it is noted that: the above-mentioned list is only the preferred embodiment of the present invention, and naturally those skilled in the art can make modifications and variations to the present invention, which should be considered as the protection scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.
Claims (5)
1. The LS composite insulation board cutting construction method is characterized by comprising the following steps of:
step one, composing an LS composite insulation board: determining a typesetting and dividing scheme according to the size of the outer wall and drawing an installation layout;
step two, snapping a line: checking the size of the LS composite insulation board before installation according to a design drawing and a typesetting drawing, designing an installation control line, and popping up the installation control line of each board;
step three, carrying and cutting: carrying the LS composite insulation board by using hoisting equipment, placing the LS composite insulation board on a cutting platform of a cutting frame body, wherein the position of a cutting line is vertical to a cutting saw; the LS composite insulation board is fastened and fixed, so that the movement in the cutting process is prevented; starting the cutting equipment and starting the spraying structure at the same time, slowly pushing the cutting equipment to move from one end to the other end, closing the equipment after cutting, resetting the cutting equipment, and carrying the cut composite insulation board to a specified place for stacking;
step four, installing a hoisting piece: drilling holes on the LS composite insulation board to serve as hoisting holes;
step five, erecting the LS composite insulation board: when the LS composite insulation board is hoisted, the surface with larger mortar thickness is the lower surface, and the LS composite insulation board is installed at a preset position after being hoisted for coarse positioning.
2. The LS composite insulation board cutting construction method according to claim 1, wherein a sliding groove is fixed on the upper portion of the cutting frame body in the third step, a pulley is mounted on the cutting device, and the pulley rolls in the sliding groove to drive the cutting device to move from one end of the cutting frame body to the other end of the cutting frame body.
3. The LS composite insulation board cutting construction method according to claim 1, wherein the spraying structure in the third step comprises a spray head, a water pump and a storage tank, the spray head is installed on the side of the cutting saw, the water outlet direction of the spray head is aligned to the cutting position, the spray head is connected with the water pump, and the water pump is communicated with the storage tank.
4. The LS composite insulation board cutting construction method according to claim 1, wherein staggered joints are installed when the LS composite insulation boards are typeset, and upper and lower through joints are strictly forbidden.
5. The LS composite insulation board cutting construction method according to claim 1, wherein a sewage recovery structure is arranged below the spraying structure in the third step, the sewage recovery structure comprises a collecting tank, a filter screen and a settling tank, the collecting tank is fixed on a cutting frame body below the cutting mechanism, the filter screen is laid in the collecting tank, the collecting tank is communicated with the settling tank, and the settling tank is connected with a storage tank to recycle filtered sewage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210520300.7A CN114851270A (en) | 2022-05-13 | 2022-05-13 | LS composite insulation board cutting construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210520300.7A CN114851270A (en) | 2022-05-13 | 2022-05-13 | LS composite insulation board cutting construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114851270A true CN114851270A (en) | 2022-08-05 |
Family
ID=82638030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210520300.7A Pending CN114851270A (en) | 2022-05-13 | 2022-05-13 | LS composite insulation board cutting construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114851270A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017084210A1 (en) * | 2015-11-16 | 2017-05-26 | 苏文藏 | Inner support wire saw lossless cutting and disassembling structure and construction method therefor |
| CN109267677A (en) * | 2018-10-31 | 2019-01-25 | 天津固安特节能科技有限公司 | A kind of GAT external mold plate cast-in-place concrete compound insulation system and its construction technology |
| CN210551494U (en) * | 2019-07-23 | 2020-05-19 | 中建三局集团有限公司 | Integration heated board design cutting machine |
| CN213674305U (en) * | 2020-11-07 | 2021-07-13 | 北京住总第一开发建设有限公司 | SPR composite heat preservation exterior sheathing cutting platform |
-
2022
- 2022-05-13 CN CN202210520300.7A patent/CN114851270A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017084210A1 (en) * | 2015-11-16 | 2017-05-26 | 苏文藏 | Inner support wire saw lossless cutting and disassembling structure and construction method therefor |
| CN109267677A (en) * | 2018-10-31 | 2019-01-25 | 天津固安特节能科技有限公司 | A kind of GAT external mold plate cast-in-place concrete compound insulation system and its construction technology |
| CN210551494U (en) * | 2019-07-23 | 2020-05-19 | 中建三局集团有限公司 | Integration heated board design cutting machine |
| CN213674305U (en) * | 2020-11-07 | 2021-07-13 | 北京住总第一开发建设有限公司 | SPR composite heat preservation exterior sheathing cutting platform |
Non-Patent Citations (1)
| Title |
|---|
| 陆总兵;陆健;: "FS复合保温板与结构一体化施工技术", 建筑, no. 23, pages 73 - 74 * |
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