CN114576468A - Diversion type penstock protection device - Google Patents
Diversion type penstock protection device Download PDFInfo
- Publication number
- CN114576468A CN114576468A CN202210086017.8A CN202210086017A CN114576468A CN 114576468 A CN114576468 A CN 114576468A CN 202210086017 A CN202210086017 A CN 202210086017A CN 114576468 A CN114576468 A CN 114576468A
- Authority
- CN
- China
- Prior art keywords
- foam concrete
- steel pipe
- penstock
- aluminum silicate
- diversion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011381 foam concrete Substances 0.000 claims abstract description 61
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 51
- 239000010959 steel Substances 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 239000004088 foaming agent Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims 4
- 230000000694 effects Effects 0.000 abstract description 15
- 238000005336 cracking Methods 0.000 abstract description 8
- 238000009413 insulation Methods 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000004567 concrete Substances 0.000 description 6
- 238000004321 preservation Methods 0.000 description 6
- 230000002411 adverse Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Building Environments (AREA)
Abstract
The invention provides a water diversion type penstock protection device, which comprises a steel pipe and is characterized in that an aluminum silicate needled felt is arranged on the outer surface of the steel pipe, foam concrete is arranged outside the aluminum silicate needled felt, and supporting steel bars are arranged in the foam concrete. The aluminum silicate needled felt can be conveniently arranged, the force generated after the steel pipe is filled with water is effectively prevented from being transmitted to external foam concrete to cause cracking of the foam concrete, so that the heat insulation effect is reduced, the self weight of the foam concrete is reduced, the heat conductivity coefficient is reduced, the heat insulation effect is improved, the tensile strength of the foam concrete is effectively improved through the arrangement of the supporting steel bars in the outer layer of the foam concrete, the safe use of the steel pipe in high-altitude areas with large temperature difference is guaranteed, the foam concrete is effectively prevented from not cracking, and the service lives of the steel pipe and the foam concrete are prolonged.
Description
Technical Field
The invention relates to a penstock protection device, in particular to a penstock protection device suitable for a high and steep slope with large day and night temperature difference, belonging to the technical field of penstock engineering.
Background
Penstock is commonly used in diversion facilities from the outlet of diversion tunnels of diversion power stations to plant sections. At present, in order to protect the pressure steel pipe from unfavorable deformation caused by temperature change, the pressure steel pipe is mainly wrapped by concrete, but because the heat conductivity coefficient of the existing concrete is relatively large (about 1.28 w/m.k), after the steel pipe is filled with water, the pressure steel pipe can be wrapped by the steel pipeForce is generated to cause concrete cracking, thereby losing the heat insulation effect on the steel pipe and ensuring that the self weight of the concrete is about 2.4t/m3Can produce adverse effect to pressure steel pipe, it is high to the mound stability requirement simultaneously, and the package tube concrete construction degree of difficulty is big, brings very big difficulty for the maintenance. There is therefore a need for improvements in the prior art.
Disclosure of Invention
In order to solve the problems that the existing concrete-covered pipe has poor heat insulation effect, high requirement on the stability of a ballast pier and the like, the invention provides the water diversion type pressure steel pipe protection device which can prevent the pressure steel pipe from generating adverse effect due to temperature change and simultaneously reduce the requirement on the stability of the ballast pier.
The invention is realized by the following technical scheme: a water diversion type pressure steel pipe protection device comprises a steel pipe and is characterized in that an aluminum silicate needled felt is arranged on the outer surface of the steel pipe, foam concrete is arranged outside the aluminum silicate needled felt, supporting steel bars are arranged in the foam concrete, and therefore the arrangement of the aluminum silicate needled felt can effectively prevent force generated after the steel pipe is filled with water from being transmitted to the external foam concrete to cause cracking of the external foam concrete and reduce the heat preservation effect, and meanwhile, the heat conductivity coefficient is reduced and the heat preservation effect is improved while the adverse effect of the self weight of the foam concrete on the pressure steel pipe is reduced.
The aluminum silicate needled felt is arranged on the outer wall of the whole steel pipe or in an upward 270-degree range of the steel pipe, and the thickness of the aluminum silicate needled felt is 2-3cm, so that the effect that the strength of the foam concrete is influenced by outward transmission of force generated when the steel pipe is filled with water is buffered.
The supporting steel bars are arranged in the periphery of the outer layer of the foam concrete, the diameter of the supporting steel bars is 5-7mm, the spacing is 15-30cm, and the supporting steel bars are used for reinforcing the tensile strength of the foam concrete and are less prone to cracking.
The section of the foam concrete is rectangular so as to increase the stability of the steel pipe on a high and steep slope.
The foam concrete is provided with a structural joint with the joint width of 20-30mm and the joint filling material of a polyethylene foam board at intervals of 15-18m, and the structural joint is used for parting to adapt to extrusion caused by deformation of the foam concrete and reduce deformation cracks.
The bottom of the foam concrete is provided with anchor rods, the length of each anchor rod is 4-6m, the length of each anchor rod inserted into the bedrock is 3-5m, and the distance between every two anchor rods is 1-3m so as to improve the stability of the foam concrete.
The foam concrete is prepared by mixing and pouring the following raw materials:
cement 500kg/m3
HF30 plant foaming agent 1kg/m3
250kg/m water3。
The indexes of the foam concrete are as follows: the dry density of 489kg/m3, the average value of compressive strength of 1.07MPa, the thermal conductivity of 0.116 w/m.k, the water absorption of 31.2 percent and the volume weight of 930kg/m3 all meet the quality requirements of the foam concrete.
The invention has the following advantages and effects: by adopting the technical scheme, the aluminum silicate needled felt can be conveniently arranged, the force generated after the steel pipe is filled with water is effectively prevented from being transmitted to external foam concrete to cause cracking of the foam concrete, so that the heat insulation effect is reduced, the self weight of the foam concrete is reduced, the heat conductivity coefficient is reduced, the heat insulation effect is improved, the tensile strength of the foam concrete is effectively improved through the arrangement of the supporting steel bars in the outer layer of the foam concrete, the steel pipe can be safely used in high-altitude areas with large temperature difference, the foam concrete is effectively prevented from not cracking, and the service lives of the steel pipe and the foam concrete are prolonged.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a schematic diagram of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
In fig. 1 and 2, the water-diversion-type penstock protection device provided by the invention comprises a penstock 1, wherein an aluminum silicate needle felt 2 is arranged on the outer surface of the penstock 1, a foam concrete 3 is arranged outside the aluminum silicate needle felt 2, a support steel bar 4 is arranged in the foam concrete 3, the aluminum silicate needle felt 2 is arranged in an upward 270-degree range of the penstock 1, and the thickness of the aluminum silicate needle felt 2 is 2cm, so that the force generated when the penstock is filled with water is buffered and transmitted outwards to influence the strength of the foam concrete; the section of the foam concrete 3 is rectangular, the supporting steel bars 4 are arranged on the periphery of the outer layer of the rectangular foam concrete 3, the diameter of each supporting steel bar is 6.5mm, the pitch is 20cm, the supporting steel bars are used for reinforcing the strength of the foam concrete, anchor rods 5 are arranged at the bottom of the foam concrete 3, the length of each anchor rod 5 is 4.5m, the pitch of each anchor rod 5 is 1.5m, the length of each anchor rod inserted into bedrock is 4m, the anchor rods are exposed out of the bedrock by 0.5m, and the stability of the foam concrete 3 on a high and steep side slope is improved; the structural joints with the joint width of 20mm and the joint filling material of polyethylene foam boards are arranged at intervals of 15m in the foam concrete 3 and are used for parting and reducing cracks generated by deformation of the foam concrete.
The foam concrete is prepared by mixing and pouring the following raw materials:
cement 500kg/m3
HF30 plant foaming agent 1kg/m3
250kg/m water3。
The indexes of the foam concrete are as follows: dry density 489kg/m3＜500kg/m3The average value of the compressive strength is more than 1.07MPa and more than 1.00MPa, the thermal conductivity is less than 0.116 w/m.k and less than 0.12 w/m.k, the water absorption is less than 40 percent by 31.2 percent, and the average value of the volume weight is 489kg/m3And all meet the quality requirement of the foam concrete.
The embodiment 1 of the invention is applied in Xizang Mimcang county, and the statistical data of local meteorological stations show that the average temperature in many years is 3.7 ℃, the extreme maximum temperature in the past year is 28.8 ℃, and the extreme minimum temperature in the past year is-24.6 ℃. Therefore, for safety consideration, in the calculation of the foam concrete, the extreme highest temperature and the extreme lowest temperature in the past year are taken as the environmental temperature.
In the process of excavating the engineering tunnel, the water temperature in the tunnel is monitored, and the monitoring result shows that the water temperature in the tunnel is basically constant at 15-18 ℃, and meanwhile, the design folding temperature of the steel pipe is considered to be 13-18 ℃, so that the temperature of the wall of the steel pipe is 15 ℃ in the calculation of the thickness of the foam concrete for the outer package. According to relevant regulations of design specifications of industrial equipment and pipeline heat insulation engineering (GB50264-2013), the thickness of the concrete wrapped outside the pressure steel pipe is calculated, and the calculation formula is as follows:
D0: taking the outer diameter of the pipeline to be 1.3 m;
D1: the outer diameter (m) of the heat-insulating layer;
λ: calculating the heat conductivity coefficient of the heat-insulating layer to obtain 0.22 w/m.K;
T0: taking the temperature of the outer surface of the pipeline to be 15 ℃;
Ta: the ambient temperature is-24.6 ℃ when the temperature is kept, and 28.8 ℃ when the temperature is kept cold;
[Q]: maximum allowable heat and cold loss (W/m) per unit area of the outer surface of the heat insulation layer2)；
as: heat transfer coefficient (W/m) between the outer surface of the heat insulating layer and the surrounding air2·k)；
δ: thickness (m) of the insulating layer;
k: the thickness correction coefficient is 1 in heat preservation and 1.4 in cold preservation.
The calculation shows that when the external temperature is 28.8 ℃ which is the highest temperature of the extreme in the past year, the thickness of the foam concrete which is coated needs 0.1m, and when the external temperature is 24.6 ℃ which is the lowest temperature of the extreme in the past year, the thickness of the foam concrete which is coated needs 0.22 m; considering that the engineering is in a Tibet high-altitude cold area, the temperature difference between day and night is large, in order to reduce the influence of the external environment temperature change on the pressure steel pipe and ensure the safe and stable operation of the pressure steel pipe, the thickness of the foam concrete coated outside the pressure steel pipe is 0.55m at the two sides and the thinnest part of the top surface.
Through the arrangement of the aluminum silicate needled felt, the phenomenon that the force generated after the steel pipe is filled with water is transmitted to external foam concrete to cause cracking of the foam concrete so as to reduce the heat preservation effect is effectively prevented, meanwhile, the self weight of the foam concrete is reduced, the heat conductivity coefficient is reduced, and the heat preservation effect is improved.
Claims (9)
1. A water diversion type pressure steel pipe protection device comprises a steel pipe and is characterized in that an aluminum silicate needled felt is arranged on the outer surface of the steel pipe, foam concrete is arranged outside the aluminum silicate needled felt, and supporting steel bars are arranged in the foam concrete.
2. The penstock protective device of claim 1, wherein the aluminum silicate needle felt is arranged on the whole outer wall of the steel pipe or is arranged in a 270-degree range with the steel pipe facing upwards.
3. The diversion penstock protective device of claim 1, wherein the aluminum silicate needle felt is 2-3cm thick.
4. The penstock protective device of claim 1, wherein the support bars are disposed in the perimeter of the outer layer of foam concrete.
5. The diversion type penstock protection device of claim 1, wherein the diameter of the supporting steel bar is 5-7mm, and the row spacing is 15-30 cm.
6. The penstock protective device of claim 1, wherein the foam concrete section is rectangular.
7. The water-diversion penstock protection device of claim 1, characterized in that a structural seam with a seam width of 20-30mm and a gap filling material of polyethylene foam board is arranged at intervals of 15-18m in the foam concrete.
8. The diversion penstock protecting device of claim 1, wherein the bottom of the foam concrete is provided with anchor rods, the length of the anchor rods is 4-6m, the length of the anchor rods inserted into bedrock is 3-5m, and the distance between the anchor rods is 1-3 m.
9. The diversion penstock protection device of claim 1, wherein the foam concrete is prepared by mixing and pouring the following raw materials:
cement 500kg/m3
HF30 plant foaming agent 1kg/m3
250kg/m water3
The indexes of the foam concrete are as follows: the dry density is 489kg/m3, the average value of the compressive strength is 1.07MPa, the thermal conductivity is 0.116 w/m.k, the water absorption is 31.2 percent, and the volume weight is 930kg/m 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210086017.8A CN114576468A (en) | 2022-01-25 | 2022-01-25 | Diversion type penstock protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210086017.8A CN114576468A (en) | 2022-01-25 | 2022-01-25 | Diversion type penstock protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114576468A true CN114576468A (en) | 2022-06-03 |
Family
ID=81772458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210086017.8A Pending CN114576468A (en) | 2022-01-25 | 2022-01-25 | Diversion type penstock protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114576468A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050155663A1 (en) * | 2004-01-20 | 2005-07-21 | Jacques Dhellemmes | Thermally insulated pipeline |
| US20100320750A1 (en) * | 2009-06-19 | 2010-12-23 | Thermacor Process, Lp | Anchor System for Pre-Insulated Piping |
| CN102505948A (en) * | 2011-10-27 | 2012-06-20 | 上海交通大学 | Foam concrete tank-type pier column for supporting in coal mines and preparation method thereof |
| CN102936886A (en) * | 2012-11-30 | 2013-02-20 | 中水北方勘测设计研究有限责任公司 | Embedded fixing structure for diversion steel penstock of hydropower station |
| CN202809895U (en) * | 2012-06-19 | 2013-03-20 | 赵鲁波 | Self-insulating foam concrete formwork wall body |
| CN203594167U (en) * | 2013-10-24 | 2014-05-14 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | Protection structure for outer wall of concrete pre-buried steel pipe |
| CN207796263U (en) * | 2017-11-01 | 2018-08-31 | 广东省水利电力勘测设计研究院 | The composite structure of novel soap-free emulsion polymeization steel pipe external wrapping concrete |
| CN113027487A (en) * | 2021-03-26 | 2021-06-25 | 中国水利水电第十四工程局有限公司 | Rich water tunnel tubular prestressing force concreties cementer |
| CN214785337U (en) * | 2021-05-14 | 2021-11-19 | 中铁房地产集团北方有限公司 | Prefabricated assembled concrete-filled steel tube composite column and building thereof |
-
2022
- 2022-01-25 CN CN202210086017.8A patent/CN114576468A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050155663A1 (en) * | 2004-01-20 | 2005-07-21 | Jacques Dhellemmes | Thermally insulated pipeline |
| US20100320750A1 (en) * | 2009-06-19 | 2010-12-23 | Thermacor Process, Lp | Anchor System for Pre-Insulated Piping |
| CN102505948A (en) * | 2011-10-27 | 2012-06-20 | 上海交通大学 | Foam concrete tank-type pier column for supporting in coal mines and preparation method thereof |
| CN202809895U (en) * | 2012-06-19 | 2013-03-20 | 赵鲁波 | Self-insulating foam concrete formwork wall body |
| CN102936886A (en) * | 2012-11-30 | 2013-02-20 | 中水北方勘测设计研究有限责任公司 | Embedded fixing structure for diversion steel penstock of hydropower station |
| CN203594167U (en) * | 2013-10-24 | 2014-05-14 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | Protection structure for outer wall of concrete pre-buried steel pipe |
| CN207796263U (en) * | 2017-11-01 | 2018-08-31 | 广东省水利电力勘测设计研究院 | The composite structure of novel soap-free emulsion polymeization steel pipe external wrapping concrete |
| CN113027487A (en) * | 2021-03-26 | 2021-06-25 | 中国水利水电第十四工程局有限公司 | Rich water tunnel tubular prestressing force concreties cementer |
| CN214785337U (en) * | 2021-05-14 | 2021-11-19 | 中铁房地产集团北方有限公司 | Prefabricated assembled concrete-filled steel tube composite column and building thereof |
Non-Patent Citations (1)
| Title |
|---|
| 文恒，颜宏亮: "水库大坝水下无人探测技术实践与进展", vol. 1, 黄河水利出版社, pages: 357 * |
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Application publication date: 20220603 |
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