CN114239113B - Method for designing transverse seam of steep slope dam segment arch dam - Google Patents
Method for designing transverse seam of steep slope dam segment arch dam Download PDFInfo
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Abstract
The invention discloses a method for designing a transverse seam of an arch dam at a steep slope dam section, which comprises the following steps: (1) determining the parting position: according to the standard requirements of the arch dam, the basic position of the transverse seam arrangement of the steep slope dam section is determined by combining the size of the flood discharge orifice of the dam body and the structural arrangement of the holes in the dam; calculating the intersection point coordinates of each slit and the dam axis according to the dam axis curve equation and the slit length; (2) selecting a transverse seam transition section of the steep slope dam section; (3) determining a transverse slot arrangement above the first control elevation; (4) determining the following transverse seam settings for the second control elevation: (5) And determining the setting of a transition seam between the first control elevation and the second control elevation. The method for designing the transverse seam of the steep slope dam segment arch dam facilitates pouring construction of the steep slope dam segment and the transverse seam surface, and improves stress distribution of the triangular body of the steep slope dam segment.
Description
Technical Field
The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a method for designing a transverse seam of an arch dam at a steep slope dam section.
Background
In a normal concrete arch dam, a transverse seam must be provided. The transverse seam is mainly used for reducing longitudinal constraint of the dam body so as to adapt to uneven settlement and temperature change of the foundation in the working period and prevent cracks from being generated in concrete. The determination of the positions and the intervals of the transverse seams is carried out, and besides the relevant factors such as dam foundation conditions, temperature control, internal stress distribution state of a dam body and the like of the concrete, the factors such as the size of flood discharge holes of the dam body, structural arrangement such as holes in the dam and the like, concrete pouring capacity and the like are researched, wherein the intervals of the transverse seams are generally selected from 15-25 m. The transverse seam surface is generally vertical or nearly vertical to the axis of the dam, the vertical direction is a vertical surface, and the included angle between the bottom seam surface of the transverse seam and the foundation surface is preferably nearly orthogonal. The bank slope of the narrow and deep river valley is steep, the gradient can reach 50-70 degrees, and the transverse seams (such as F1, F2, F4 and F5 in fig. 1) of the steep slope dam section adopt vertical seams from the dam crest to the dam foundation, so that the arrangement of transverse seam surface key grooves and the later seam grouting are facilitated, but the upstream and downstream height difference of a transverse seam base surface is large (such as fig. 2), and the construction progress of arch dam pouring and the dam stress near the base surface are not facilitated. Therefore, how to arrange the transverse seams is favorable for dam pouring, improving the dam stress and constructing and grouting the transverse seam surface is a goal of optimizing the transverse seam design of the arch dam of the steep slope dam section.
Disclosure of Invention
The invention aims to provide a method for designing transverse joints of a steep slope dam segment arch dam, which solves the problems in the prior art, facilitates pouring construction of the steep slope dam segment and transverse joint surfaces, and improves stress distribution of triangular bodies of the steep slope dam segment.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a method for designing a transverse seam of an arch dam at a steep slope dam section, which comprises the following steps:
(1) Determining parting positions:
according to the standard requirements of the arch dam, the basic position of the transverse seam arrangement of the steep slope dam section is determined by combining the size of the flood discharge orifice of the dam body and the structural arrangement of the holes in the dam; calculating the intersection point coordinates of each slit and the dam axis according to the dam axis curve equation and the slit length;
(2) Selecting a transverse seam transition section of a steep slope dam section:
selecting a transition joint section of a transverse joint surface of a steep slope dam section according to the elevation of a drainage building of the arch dam body, wherein the transition joint section is required to avoid the drainage building, namely, determining a first control elevation to a second control elevation, and the first control elevation is higher than the second control elevation;
(3) Determining a cross joint setting above a first control elevation:
the transverse slits higher than the first control elevation are all vertical slits; the parting point on the center line of the arch ring on the transverse seam and the first control elevation determined in the step (1) is point A, and the radial line X1 of the center line of the arch ring where the point A is positioned is used as the transverse seam above the first control elevation;
(4) Determining the following transverse seam settings of the second control elevation:
the intersection point of the radial line X1 and the upstream surface of the arch ring of the first control elevation is a point B, and the intersection point of the radial line X1 and the downstream surface of the arch ring of the first control elevation is a point C; taking the point B as an origin, taking the view angle of overlooking the dam body of the arch dam as the reference, rotating the radial line X1 anticlockwise by an angle a, taking the intersection point of the radial line X1 after rotation and the upstream surface of the arch ring of the second control elevation as the point D, taking the intersection point of the radial line X1 after rotation and the downstream surface of the arch ring of the second control elevation as the point E, taking the connection line of the point D and the point E as a transverse seam line X2 below the second control elevation 2, and taking the transverse seam line X2 as a vertical seam;
(5) Determining a setting of a transition gap between the first control elevation and the second control elevation:
the planes of the point B, the point C, the point D and the point E are transition seams, and the transition seams are oblique torsion planes; the connecting line of the point B and the point D is a BD line, and the connecting line of the point C and the point E is a CE line;
dividing the BD line and the CE line into N parts respectively, forming N-1 division points on the BD line and the CE line respectively, wherein the division points from the second control elevation to the first control elevation on the BD line are respectively a first upstream division point and a second upstream division point … … N-1 upstream division point, the division points from the second control elevation to the first control elevation on the CE line are respectively a first downstream division point and a second downstream division point … … N-1 downstream division point, the first upstream division point is connected with the second upstream division point, the second upstream division point is connected with the second downstream division point … … the N-1 upstream division line is connected with the N-1 downstream division point, and a casting seam of N-1 casting layer is formed, and the casting seam of X1 or X2 is taken as a casting seam of any layer, and the casting seam is a uniform seam of any layer.
Preferably, the method further comprises the step (6) of rechecking the structure of the cross joint wedge body of the arch dam, and ensuring that the arc length S1 of the upstream surface of the cross joint wedge body is larger than the arc length S2 of the downstream surface.
Preferably, the method further comprises the step of (7) rechecking the upstream and downstream height differences of the transverse joint surface of the arch dam:
the upstream and downstream height difference of the transverse seam section building base surface is controlled to be 10-15 meters; if not, repeating the steps (4) - (6), and increasing the rotation angle a in the step (4) until the upstream and downstream height differences of the transverse seam surface are controlled to be 10-15 meters.
Preferably, the bottom end of any one of the pouring layer transverse slits is leveled with the top end of the adjacent pouring layer transverse slit, and the top end of any one of the pouring layer transverse slits is leveled with the bottom end of the adjacent pouring layer transverse slit.
Preferably, the angle a is of a size of 3 ° to 5 °.
Preferably, the drainage building comprises a surface hole, a deep hole and a bottom hole on the arch dam body.
Compared with the prior art, the invention has the following technical effects:
the method for designing the transverse seam of the steep slope dam segment arch dam facilitates pouring construction of the steep slope dam segment and the transverse seam surface, and improves stress distribution of the triangular body of the steep slope dam segment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a dam transverse seam arrangement in the prior art;
FIG. 2 is a schematic cross-sectional view of a prior art steep slope dam segment;
FIG. 3 is a schematic diagram showing the selection of transverse joints and transition joints of a steep slope dam segment according to the invention;
FIG. 4 is a schematic diagram of the design of the transverse seam of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4;
FIG. 6 is a schematic diagram of a transverse seam in the present invention;
FIG. 7 is a second design concept of the transverse seam of the present invention;
FIG. 8 is a schematic view in section B-B of FIG. 3;
wherein: 1. a steep slope dam section; 2. an upstream face; 3. building a base surface; 4. a downstream face; 5. a surface hole; 6. deep holes; 7. a bottom hole; 8. a first control elevation; 9. a second control elevation; 10. a transition joint; 11. the center line of the arch dam; 12. an arch ring for controlling the elevation; 13. an arch ring center line on the first control elevation; 14. an arch ring for controlling the elevation; 15. a first pouring layer transverse seam; 16. a second pouring layer transverse seam; 17. pouring a layer transverse seam on the N-1 th layer; 18. a first casting layer; 19. a second casting layer; 20. a third casting layer; 21. the N-1 th pouring layer; 22. and (3) transverse joint of the third pouring layer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art based on the embodiments of the invention without any inventive effort, are intended to fall within the scope of the invention.
The invention aims to provide a method for designing transverse joints of a steep slope dam segment arch dam, which solves the problems in the prior art, facilitates pouring construction of the steep slope dam segment and transverse joint surfaces, and improves stress distribution of triangular bodies of the steep slope dam segment.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 3 to 8: the embodiment provides a method for designing a transverse seam of an arch dam of a steep slope dam section, which comprises the following steps:
(1) Determining parting positions:
according to the standard requirements of the arch dam, the basic position of the transverse seam arrangement of the steep slope dam section 1 is determined by combining the size of the flood discharge orifice of the dam body and the structural arrangement of the holes in the dam; calculating the intersection point coordinates of each slit and the dam axis according to the dam axis curve equation and the slit length;
(2) Selecting a transverse seam transition section of the steep slope dam section 1:
according to the heights of water discharge buildings such as a surface hole 5, a deep hole 6, a bottom hole 7 and the like on the arch dam body, selecting a transition joint 10 section of a transverse joint surface of the steep slope dam section 1, wherein the transition joint 10 section is required to avoid the water discharge buildings such as the surface hole 5, the deep hole 6, the bottom hole 7 and the like on the arch dam body, namely determining a first control height 8 to a second control height 9, and the first control height 8 is higher than the second control height 9;
(3) Determining a transverse seam setting above a first control elevation 8:
the transverse slits higher than the first control elevation 8 are all vertical slits; taking a certain transverse seam on one side of the arch dam central line 11 in fig. 4 as an example, the parting point on the central line 13 of the arch ring on the first control elevation and the transverse seam determined in the step (1) are points A, and the radial line X1 of the central line of the arch ring where the points A are positioned is used as the transverse seam above the first control elevation 8;
(4) Determining the transverse seam settings below the second control elevation 9:
the intersection point of the radial line X1 and the upstream surface 2 of the arch ring 12 of the first control elevation is a point B, and the intersection point of the radial line X1 and the downstream surface 4 of the arch ring 12 of the first control elevation is a point C; taking the point B as an origin, taking the view angle of overlooking the dam body of the arch dam as the reference point, rotating the radial line X1 anticlockwise by an angle a of 3-5 degrees, wherein the intersection point of the rotated radial line X1 and the upstream surface 2 of the arch ring 14 of the second control elevation is the point D, the intersection point of the rotated radial line X1 and the downstream surface 4 of the arch ring 14 of the second control elevation is the point E, the connecting line of the point D and the point E is a transverse seam line X2 below the second control elevation 92, and the transverse seam line X2 is a straight lead seam;
(5) The setting of the transition gap 10 between the first control level 8 and the second control level 9 is determined:
the plane where the points B, C, D and E are located is a transition joint 10, and the transition joint 10 is an oblique torsion plane; the connection line of the point B and the point D is a BD line, and the connection line of the point C and the point E is a CE line;
dividing BD line and CE line into N parts, forming N-1 dividing points on BD line and CE line, dividing BD line from second control elevation 9 to first control elevation 8 into first upstream dividing point and second upstream dividing point … … N-1 upstream dividing point, dividing CE line from second control elevation 9 to first control elevation 8 into first downstream dividing point and second downstream dividing point … … N-1 downstream dividing point, connecting first upstream dividing point with second upstream dividing point, connecting second upstream dividing point with second downstream dividing point … … N-1 upstream dividing line with N-1 downstream dividing point, forming N-1 pouring layer transverse seams which are respectively a first pouring layer transverse seam 15, a second pouring layer transverse seam 16, a third pouring layer transverse seam 22 … … and an N-1 pouring layer transverse seam 17, referring to FIG. 7, the first pouring layer 18, the second pouring layer 19, the third pouring layer 20, … … and the N-1 pouring layer 21 are distributed from a second control elevation 9 to a first control elevation 8 in sequence, a radial line X1 is used as the N pouring layer transverse seam, any one of the pouring layer transverse seams is a vertical seam, and the crossing heights of each pouring layer transverse seam are equal; in this embodiment, the value of N is 10; the value of N-1 is 9, the height difference between the first control elevation 8 and the second elevation is 30m, 10 casting layers are arranged between the first control elevation 8 and the second elevation, and the height spanned by the transverse seam of each casting layer is 3m.
The bottom end of any casting layer transverse seam is leveled with the top end of the adjacent casting layer transverse seam, and the top end of any casting layer transverse seam is leveled with the bottom end of the adjacent casting layer transverse seam;
(6) And checking the structure of the wedge-shaped body between transverse seams of the arch dam, and ensuring that the arc length S1 of the upstream surface 2 of the wedge-shaped body between the transverse seams is larger than the arc length S2 of the downstream surface 4.
(7) Checking the upstream and downstream height difference of the transverse joint surface of the arch dam:
the height difference between the upstream and the downstream of the transverse seam section building base surface 3 is controlled to be 10-15 meters; if not, repeating the steps (4) - (6), and increasing the rotation angle a in the step (4) until the upstream and downstream height differences of the transverse seam surface are controlled to be 10-15 meters.
The method for designing the transverse seam of the steep slope dam section arch dam has the advantages that the upstream and downstream height difference of the transverse seam surface of the arch dam is controlled to be 10-15 meters, so that the construction progress of the arch dam is accelerated, the triangular body between the transverse seam and the building base surface 3 is obviously reduced, and the stress distribution of the triangular body of the steep slope dam section near the dam foundation is improved.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "center", "top", "bottom", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The principles and embodiments of the present invention have been described in this specification with reference to specific examples, the description of which is only for the purpose of aiding in understanding the method of the present invention and its core ideas; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (6)
1. A method for designing a transverse seam of an arch dam at a steep slope dam section is characterized by comprising the following steps:
(1) Determining parting positions:
according to the standard requirements of the arch dam, the basic position of the transverse seam arrangement of the steep slope dam section is determined by combining the size of the flood discharge orifice of the dam body and the structural arrangement of the holes in the dam; calculating the intersection point coordinates of each slit and the dam axis according to the dam axis curve equation and the slit length;
(2) Selecting a transverse seam transition section of a steep slope dam section:
selecting a transition joint section of a transverse joint surface of a steep slope dam section according to the elevation of a drainage building of the arch dam body, wherein the transition joint section is required to avoid the drainage building, namely, determining a first control elevation to a second control elevation, and the first control elevation is higher than the second control elevation;
(3) Determining a cross joint setting above a first control elevation:
the transverse slits higher than the first control elevation are all vertical slits; the parting point on the center line of the arch ring on the transverse seam and the first control elevation determined in the step (1) is point A, and the radial line X1 of the center line of the arch ring where the point A is positioned is used as the transverse seam above the first control elevation;
(4) Determining the following transverse seam settings of the second control elevation:
the intersection point of the radial line X1 and the upstream surface of the arch ring of the first control elevation is a point B, and the intersection point of the radial line X1 and the downstream surface of the arch ring of the first control elevation is a point C; taking the point B as an origin, taking the view angle of overlooking the dam body of the arch dam as the reference, rotating the radial line X1 anticlockwise by an angle a, taking the intersection point of the radial line X1 after rotation and the upstream surface of the arch ring of the second control elevation as the point D, taking the intersection point of the radial line X1 after rotation and the downstream surface of the arch ring of the second control elevation as the point E, taking the connection line of the point D and the point E as a transverse seam line X2 below the second control elevation 2, and taking the transverse seam line X2 as a vertical seam;
(5) Determining a setting of a transition gap between the first control elevation and the second control elevation:
the planes of the point B, the point C, the point D and the point E are transition seams, and the transition seams are oblique torsion planes; the connecting line of the point B and the point D is a BD line, and the connecting line of the point C and the point E is a CE line;
dividing the BD line and the CE line into N parts respectively, forming N-1 division points on the BD line and the CE line respectively, wherein the division points from the second control elevation to the first control elevation on the BD line are respectively a first upstream division point and a second upstream division point … … N-1 upstream division point, the division points from the second control elevation to the first control elevation on the CE line are respectively a first downstream division point and a second downstream division point … … N-1 downstream division point, the first upstream division point is connected with the second upstream division point, the second upstream division point is connected with the second downstream division point … … the N-1 upstream division line is connected with the N-1 downstream division point, and a casting seam of N-1 casting layer is formed, and the casting seam of X1 or X2 is taken as a casting seam of any layer, and the casting seam is a uniform seam of any layer.
2. The method for designing the transverse seam of the steep slope dam segment arch dam according to claim 1, wherein the method comprises the following steps: and (6) checking the structure of the cross joint wedge body of the arch dam, and ensuring that the arc length S1 of the upstream surface of the cross joint wedge body is larger than the arc length S2 of the downstream surface of the cross joint wedge body.
3. The method for designing the transverse seam of the steep slope dam segment arch dam according to claim 2, wherein the method comprises the following steps: the method further comprises the step (7) of rechecking the upstream and downstream height differences of the transverse joint surface of the arch dam:
the upstream and downstream height difference of the transverse seam section building base surface is controlled to be 10-15 meters; if not, repeating the steps (4) - (6), and increasing the rotation angle a in the step (4) until the upstream and downstream height differences of the transverse seam surface are controlled to be 10-15 meters.
4. A steep slope dam segment arch dam transverse joint design method according to any one of claims 1-3, wherein: the bottom end of any one of the pouring layer transverse seams is leveled with the top end of the adjacent pouring layer transverse seam, and the top end of any one of the pouring layer transverse seams is leveled with the bottom end of the adjacent pouring layer transverse seam.
5. The method for designing the transverse seam of the steep slope dam segment arch dam according to any one of claims 1, wherein the method comprises the following steps: the angle a is 3-5 deg.
6. The method for designing the transverse seam of the steep slope dam segment arch dam according to any one of claims 1, wherein the method comprises the following steps: the drainage building comprises a surface hole, a deep hole and a bottom hole on the arch dam body.
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| CN202111571688.5A CN114239113B (en) | 2021-12-21 | 2021-12-21 | Method for designing transverse seam of steep slope dam segment arch dam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111571688.5A CN114239113B (en) | 2021-12-21 | 2021-12-21 | Method for designing transverse seam of steep slope dam segment arch dam |
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| CN114239113B true CN114239113B (en) | 2024-03-29 |
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| CN102828492A (en) * | 2012-09-17 | 2012-12-19 | 黄河勘测规划设计有限公司 | Optimal design method of cross joint of arch dam |
| WO2018171119A1 (en) * | 2017-03-21 | 2018-09-27 | 中国葛洲坝集团三峡建设工程有限公司 | Hydraulic self-lifting truss-type heavy arch dam formwork system using cantilever |
| CN208455578U (en) * | 2018-07-20 | 2019-02-01 | 中国电建集团成都勘测设计研究院有限公司 | Steep slope section Arch Dam With Joint structure |
| CN210049205U (en) * | 2019-05-15 | 2020-02-11 | 中国电建集团中南勘测设计研究院有限公司 | Arch dam |
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2021
- 2021-12-21 CN CN202111571688.5A patent/CN114239113B/en active Active
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|---|---|---|---|---|
| CN102828492A (en) * | 2012-09-17 | 2012-12-19 | 黄河勘测规划设计有限公司 | Optimal design method of cross joint of arch dam |
| WO2018171119A1 (en) * | 2017-03-21 | 2018-09-27 | 中国葛洲坝集团三峡建设工程有限公司 | Hydraulic self-lifting truss-type heavy arch dam formwork system using cantilever |
| CN208455578U (en) * | 2018-07-20 | 2019-02-01 | 中国电建集团成都勘测设计研究院有限公司 | Steep slope section Arch Dam With Joint structure |
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| 高拱坝体形设计中分析及优化;陈丹等;河南水利与南水北调;20190630;全文 * |
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