CN114239113A - Abrupt slope dam section arch dam transverse joint design method - Google Patents
Abrupt slope dam section arch dam transverse joint design method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
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Abstract
The invention discloses a method for designing a transverse seam of an arch dam of a steep slope dam section, which comprises the following steps: (1) determining the parting position: determining the basic position of transverse seam arrangement of a steep slope dam section according to the specification requirements of the arch dam by combining the size of a flood discharge orifice of a dam body and the structural arrangement of holes in the dam; calculating the intersection point coordinate of each seam and the dam axis according to the dam axis curve equation and the parting length; (2) selecting a transverse seam transition section of the steep slope dam section; (3) determining the arrangement of the transverse seam above the first control elevation; (4) determining the transverse seam setting below a second control elevation: (5) determining a setting of a transition seam between the first control elevation to the second control elevation. The method for designing the transverse seam of the arch dam of the steep slope dam section facilitates the pouring construction of the steep slope dam section and the transverse seam surface, and improves the stress distribution of the triangular body of the steep slope dam section.
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 of a steep slope dam section.
Background
In a normal concrete arch dam, a transverse joint must be provided. The transverse seam is mainly used for reducing longitudinal restraint of the dam body so as to adapt to uneven settlement and temperature change of the foundation in the application period and prevent concrete from generating cracks. The determination of the position and the distance of the transverse seam is to study factors such as the size of a flood discharge orifice of a dam body, structural arrangement of holes in the dam and the like, the pouring capacity of concrete and the like besides relevant factors such as dam foundation conditions, temperature control and internal stress distribution state of the dam body, wherein cracks are possibly generated in concrete, and the distance of the transverse seam is generally selected between 15 and 25 m. The transverse seam surface is generally vertical or nearly vertical to the dam axis, the vertical direction is a vertical surface, and the included angle between the seam surface at the bottom of the transverse seam and the foundation surface is close to the orthogonal direction. The bank slope of the narrow and deep river valley is steep, the slope can reach 50-70 degrees, vertical seams from the dam top to the dam foundation (such as F1, F2, F4 and F5 in the figure 1) of transverse seams of the steep slope dam section are vertical seams, the arrangement of key grooves of the transverse seam surface and later-stage seam grouting are facilitated, however, the height difference between the upstream and the downstream of a transverse seam building base surface is large (such as the figure 2), and the construction progress of arch dam pouring and the dam body stress near the building base surface are not facilitated. Therefore, how to arrange the transverse seams is beneficial to pouring the dam body, improving the stress of the dam body and constructing and grouting the transverse seam surface is the target of designing and optimizing the transverse seams of the arch dam of the steep slope dam section.
Disclosure of Invention
The invention aims to provide a method for designing a transverse seam of an arch dam of a steep slope dam section, which is used for solving the problems in the prior art, facilitating the pouring construction of the steep slope dam section and the transverse seam surface and improving the stress distribution of a triangular body of the steep slope dam section.
In order to achieve the purpose, the invention provides the following scheme:
the invention 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 the parting position:
determining the basic position of transverse seam arrangement of a steep slope dam section according to the specification requirements of the arch dam by combining the size of a flood discharge orifice of a dam body and the structural arrangement of holes in the dam; calculating the intersection point coordinate of each seam and the dam axis according to the dam axis curve equation and the parting length;
(2) selecting a transverse seam transition section of the steep slope dam section:
selecting a transition joint interval of a transverse joint surface of a steep slope dam section according to the elevation of a water outlet structure of the arch dam body, wherein if the transition joint interval needs to avoid the water outlet structure, a first control elevation is determined to be a second control elevation, and the first control elevation is higher than the second control elevation;
(3) determining the transverse seam setting above a first control elevation:
the transverse seams higher than the first control elevation are all vertical seams; the transverse seam determined in the step (1) and a parting point on an arch ring center line on a first control elevation are points A, and a radial line X1 of the arch ring center line where the points A are located is used as the transverse seam above the first control elevation;
(4) determining the transverse seam setting below a second control elevation:
the intersection point of the radial line X1 and the upstream face of the arch ring at the first control elevation is point B, and the intersection point of the radial line X1 and the downstream face of the arch ring at the first control elevation is point C; taking a point B as an origin, and taking a visual angle of an overlooking arch dam body as a reference, rotating the radial line X1 by an anticlockwise angle a, taking an intersection point of the rotated radial line X1 and an arch ring upstream face of the second control elevation as a point D, taking an intersection point of the rotated radial line X1 and an arch ring downstream face of the second control elevation as a point E, taking a connecting line of the point D and the point E as a transverse sewing line X2 below the second control elevation 2, and taking the transverse sewing line X2 as a lead straight seam;
(5) determining a setting of a transition seam between the first control elevation to the second control elevation:
the planes where the four points B, C, D and E are located are transition seams which are skew surfaces; 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;
equally dividing the BD line and the CE line into N parts respectively, and forming N-1 dividing points on the BD line and the CE line respectively, wherein the dividing points from the second control elevation to the first control elevation on the BD line are a first upstream dividing point and a second upstream dividing point … …, the dividing points from the second control elevation to the first control elevation on the CE line are a first downstream dividing point and a second downstream dividing point … …, an N-1 downstream dividing point respectively, connecting the first upstream dividing point with the second upstream dividing point, connecting the second upstream dividing point with the second downstream dividing point … …, and connecting the N-1 upstream dividing line with the N-1 downstream dividing point to form N-1 casting layer transverse seams, and the radial line X1 or the transverse seam line X2 is used as the Nth transverse seam of the casting layer, any transverse seam of the casting layer is a vertical straight seam, and the heights spanned by the transverse seams of the casting layer are equal.
Preferably, the method further comprises the step (6) of rechecking the structure of the wedge between the transverse slots of the arch dam, and ensuring that the arc length S1 of the upstream surface of the wedge between the transverse slots is larger than the arc length S2 of the downstream surface of the wedge between the transverse slots.
Preferably, the method further comprises the step (7) of restoring the height difference between the upstream and the downstream of the transverse joint surface of the arch dam:
the height difference between the upstream and downstream of the cross joint section building base surface is controlled to be 10-15 m; if not, repeating the steps (4) to (6), and increasing the rotation angle a in the step (4) until the height difference between the upstream and the downstream of the cross seam surface is controlled to be 10-15 meters.
Preferably, the bottom end of any one of the transverse seams of the pouring layer is flush with the top end of the adjacent transverse seam of the pouring layer, and the top end of any one of the transverse seams of the pouring layer is flush with the bottom end of the adjacent transverse seam of the pouring layer.
Preferably, the magnitude of the angle a is 3 ° to 5 °.
Preferably, the outlet structure 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 arch dam of the steep slope dam section facilitates the pouring construction of the steep slope dam section and the transverse seam surface, and improves the stress distribution of the triangular body of the steep slope dam section.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a dam transverse seam arrangement in the prior art;
FIG. 2 is a schematic cross-sectional view of a steep slope dam section in the prior art;
FIG. 3 is a schematic diagram showing the selection of transverse seams and transition seams of a steep slope dam section in the invention;
FIG. 4 is a view showing the design concept of the transverse seam of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4;
FIG. 6 is a first design view of the transverse seam of the present invention;
FIG. 7 is a second design view of the transverse seam of the present invention;
FIG. 8 is a schematic cross-sectional view taken along line B-B of FIG. 3;
wherein: 1. a steep slope dam section; 2. an upstream face; 3. building a base plane; 4. a downstream face; 5. a watch hole; 6. deep holes; 7. a bottom hole; 8. a first control elevation; 9. a second control elevation; 10. a transition seam; 11. the center line of the arch dam; 12. a first elevation control arch ring; 13. an arch ring centerline at a first control elevation; 14. a second elevation control arch ring; 15. a first pouring layer transverse seam; 16. a second pouring layer transverse seam; 17. the N-1 pouring layer transverse seam; 18. a first casting layer; 19. a second pouring layer; 20. a third pouring layer; 21. the Nth-1 pouring layer; 22. and thirdly, pouring a layer transverse seam.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide a method for designing a transverse seam of an arch dam of a steep slope dam section, which is used for solving the problems in the prior art, facilitating the pouring construction of the steep slope dam section and the transverse seam surface and improving the stress distribution of a triangular body of the steep slope dam section.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
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 the parting position:
determining the basic position of the transverse seam arrangement of the steep slope dam section 1 according to the specification requirements of the arch dam by combining the size of the flood discharge orifice of the dam body and the structural arrangement of holes in the dam; calculating the intersection point coordinate of each seam and the dam axis according to the dam axis curve equation and the parting length;
(2) selecting a transverse seam transition section of the steep slope dam section 1:
selecting a transition joint 10 interval of a transverse joint surface of a steep slope dam section 1 according to the elevations of the drainage structures such as a surface hole 5, a deep hole 6, a bottom hole 7 and the like on the arch dam body, wherein the transition joint 10 interval needs to avoid the drainage structures such as the surface hole 5, the deep hole 6, the bottom hole 7 and the like on the arch dam body, namely a first control elevation 8 and a second control elevation 9 are determined, and the first control elevation 8 is higher than the second control elevation 9;
(3) determining the transverse seam setting above a first control elevation 8:
the transverse seams higher than the first control elevation 8 are all vertical seams; taking a certain transverse seam on one side of the arch dam center line 11 in fig. 4 as an example, the transverse seam determined in the step (1) and a parting point on the arch ring center line 13 at the first control elevation are points a, and a radial line X1 of the arch ring center line where the points a are located is taken as a transverse seam above the first control elevation 8;
(4) determining the transverse seam setting below the second control elevation 9:
the intersection of the radial line X1 and the upstream face 2 of the arch ring 12 at the first control elevation is point B, and the intersection of the radial line X1 and the downstream face 4 of the arch ring 12 at the first control elevation is point C; taking the point B as an original point, taking the overlooking view angle of the dam body of the arch dam as a reference, rotating a radial line X1 by an anticlockwise rotation angle a, wherein the angle a is 3-5 degrees, the intersection point of the rotated radial line X1 and the upstream surface 2 of the arch ring 14 at the second control elevation is a point D, the intersection point of the rotated radial line X1 and the downstream surface 4 of the arch ring 14 at the second control elevation is a 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 a transverse seam line X2 is a lead straight seam;
(5) determining a setting of a transition seam 10 between the first control elevation 8 and the second control elevation 9:
the plane where the four points B, C, D and E are located is the transition seam 10, and the transition seam 10 is a skew surface; 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;
equally dividing the BD line and the CE line into N parts respectively, forming N-1 dividing points on the BD line and the CE line respectively, wherein the dividing points from the second control elevation 9 to the first control elevation 8 on the BD line are respectively a first upstream dividing point and a second upstream dividing point … …, the dividing points from the second control elevation 9 to the first control elevation 8 on the CE line are respectively a first downstream dividing point and a second downstream dividing point … …, N-1 downstream dividing points, connecting the first upstream dividing point with the second upstream dividing point, connecting the second upstream dividing point with the second downstream dividing point with … …, connecting the N-1 upstream dividing line with the N-1 downstream dividing points to form N-1 casting layer transverse seams which are respectively a first casting layer transverse seam 15, a second casting layer transverse seam 16 and a third casting layer transverse seam 22 … …, and connecting the N-1 casting layer transverse seam 17, referring to fig. 7, a first casting layer 18, a second casting layer 19, a third casting layer 20 … …, an N-1 casting layer 21 and an nth casting layer are sequentially distributed from a second control elevation 9 to a first control elevation 8, a radial line X1 is used as an nth casting layer transverse seam, any one casting layer transverse seam is a vertical seam, and the height spanned by each casting layer transverse seam is equal; in this embodiment, N takes the value of 10; the value of N-1 is 9, the height difference between the first control elevation 8 and the second elevation is 30m, 10 pouring layers are arranged between the first control elevation 8 and the second elevation in total, and the height spanned by the transverse seam of each pouring layer is 3 m.
The bottom end of any one pouring layer transverse seam is flush with the top end of the adjacent pouring layer transverse seam, and the top end of any one pouring layer transverse seam is flush with the bottom end of the adjacent pouring layer transverse seam;
(6) the structure of the wedge body between the transverse joints of the double-core arch dam ensures that the arc length S1 of the upstream surface 2 of the wedge body between the transverse joints is larger than the arc length S2 of the downstream surface 4.
(7) Height difference between upstream and downstream of transverse joint surface of the double-core arch dam:
the height difference between the upper part and the lower part of the cross joint section building surface 3 is controlled to be 10-15 m; if not, repeating the steps (4) to (6), and increasing the rotation angle a in the step (4) until the height difference between the upstream and the downstream of the cross seam surface is controlled to be 10-15 meters.
The method for designing the transverse seam of the arch dam of the steep slope dam section has the advantages that the height difference between the upstream and downstream of the transverse seam surface of the arch dam is controlled to be 10-15 m, the construction progress of the arch dam is facilitated to be accelerated, the triangular bodies between the transverse seam and the 3 th building base surface are remarkably reduced, and the stress distribution of the triangular bodies of the steep slope dam section near the dam base is improved.
In the description of the present invention, it should be noted that the terms "center", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, 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 principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A method for designing transverse seams of an arch dam of a steep slope dam section is characterized by comprising the following steps:
(1) determining the parting position:
determining the basic position of transverse seam arrangement of a steep slope dam section according to the specification requirements of the arch dam by combining the size of a flood discharge orifice of a dam body and the structural arrangement of holes in the dam; calculating the intersection point coordinate of each seam and the dam axis according to the dam axis curve equation and the parting length;
(2) selecting a transverse seam transition section of the steep slope dam section:
selecting a transition joint interval of a transverse joint surface of a steep slope dam section according to the elevation of a water outlet structure of the arch dam body, wherein if the transition joint interval needs to avoid the water outlet structure, a first control elevation is determined to be a second control elevation, and the first control elevation is higher than the second control elevation;
(3) determining the transverse seam setting above a first control elevation:
the transverse seams higher than the first control elevation are all vertical seams; the transverse seam determined in the step (1) and a parting point on an arch ring center line on a first control elevation are points A, and a radial line X1 of the arch ring center line where the points A are located is used as the transverse seam above the first control elevation;
(4) determining the transverse seam setting below a second control elevation:
the intersection point of the radial line X1 and the upstream face of the arch ring at the first control elevation is point B, and the intersection point of the radial line X1 and the downstream face of the arch ring at the first control elevation is point C; taking a point B as an origin, and taking a visual angle of an overlooking arch dam body as a reference, rotating the radial line X1 by an anticlockwise angle a, taking an intersection point of the rotated radial line X1 and an arch ring upstream face of the second control elevation as a point D, taking an intersection point of the rotated radial line X1 and an arch ring downstream face of the second control elevation as a point E, taking a connecting line of the point D and the point E as a transverse sewing line X2 below the second control elevation 2, and taking the transverse sewing line X2 as a lead straight seam;
(5) determining a setting of a transition seam between the first control elevation to the second control elevation:
the planes where the four points B, C, D and E are located are transition seams which are skew surfaces; 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;
equally dividing the BD line and the CE line into N parts respectively, and forming N-1 dividing points on the BD line and the CE line respectively, wherein the dividing points from the second control elevation to the first control elevation on the BD line are a first upstream dividing point and a second upstream dividing point … …, the dividing points from the second control elevation to the first control elevation on the CE line are a first downstream dividing point and a second downstream dividing point … …, an N-1 downstream dividing point respectively, connecting the first upstream dividing point with the second upstream dividing point, connecting the second upstream dividing point with the second downstream dividing point … …, and connecting the N-1 upstream dividing line with the N-1 downstream dividing point to form N-1 casting layer transverse seams, and the radial line X1 or the transverse seam line X2 is used as the Nth transverse seam of the casting layer, any transverse seam of the casting layer is a vertical straight seam, and the heights spanned by the transverse seams of the casting layer are equal.
2. The method for designing the transverse seam of the steep slope dam section arch dam according to claim 1, characterized in that: and (6) rechecking the structure of the wedge body between the transverse joints of the arch dam, and ensuring that the arc length S1 of the upstream surface of the wedge body between the transverse joints is larger than the arc length S2 of the downstream surface.
3. The method for designing the transverse seam of the steep slope dam section arch dam according to claim 2, characterized in that: and (7) checking the height difference between the upstream and the downstream of the transverse joint surface of the arch dam:
the height difference between the upstream and downstream of the cross joint section building base surface is controlled to be 10-15 m; if not, repeating the steps (4) to (6), and increasing the rotation angle a in the step (4) until the height difference between the upstream and the downstream of the cross seam surface is controlled to be 10-15 meters.
4. The method for designing the transverse seam of the steep slope dam section arch dam according to any one of claims 1-3, wherein: the bottom end of any one of the transverse seams of the pouring layer is flush with the top end of the adjacent transverse seam of the pouring layer, and the top end of any one of the transverse seams of the pouring layer is flush with the bottom end of the adjacent transverse seam of the pouring layer.
5. The method for designing the transverse seam of the steep slope dam section arch dam according to any one of the claims 1, wherein: the size of the angle a is 3-5 degrees.
6. The method for designing the transverse seam of the steep slope dam section arch dam according to any one of the claims 1, wherein: the water outlet 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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| 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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| 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
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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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| 陈丹等: "高拱坝体形设计中分析及优化", 河南水利与南水北调, 30 June 2019 (2019-06-30) * |
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