CN215758501U - Protection structure of immersed prestressed steel beam in reservoir area - Google Patents
Protection structure of immersed prestressed steel beam in reservoir area Download PDFInfo
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- CN215758501U CN215758501U CN202121925330.3U CN202121925330U CN215758501U CN 215758501 U CN215758501 U CN 215758501U CN 202121925330 U CN202121925330 U CN 202121925330U CN 215758501 U CN215758501 U CN 215758501U
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Abstract
The utility model discloses a protective structure of a submerged prestressed steel beam in a reservoir area, which comprises a pier foundation section in the reservoir area and a plurality of prestressed steel beams at least part of which are embedded into the pier foundation section, wherein sleeves at least part of which are embedded into the pier foundation section are sleeved outside each prestressed steel beam, and the top of each sleeve is hermetically laid with a cover plate. The protective structure effectively protects the prestressed steel bundles soaked in water, and ensures that the prestressed steel bundles are still effective in the construction of the next year in the low water level period. The construction method comprises the steps of constructing in a two-stage low water level period, arranging a sleeve outside a prestressed steel beam to protect the prestressed steel beam in the first-stage low water level period, and cutting off the side part of the sleeve when the second-stage low water level period is reached, wherein the sleeve after the side part is cut off can continue to serve as a stiff framework for subsequent construction of the bridge tower.
Description
Technical Field
The utility model relates to the field of design and construction of prestressed steel bundles, in particular to a protective structure of a submerged prestressed steel bundle in a reservoir area.
Background
For a general reservoir area, water storage is started from a normal low water level of 145.0m every 10 months and 1 day, the water is stored from the bottom of 10 months to a normal high water level of 175m, and the 175m high water level is maintained for two months (when water is dry in winter) to three months (when water is rich in winter) in the period of 11, 12 and 1 month; due to the needs of power generation and downstream water supply, a precipitation process is carried out, the water level of the reservoir area in 1-5 months is reduced to the normal low water level of 145.0m, a new round of water storage is started in 10 months, and the process is repeated. The reservoir level therefore operates as follows:
the operation is carried out at a low water level of 145m from the beginning of 6 months to the end of 9 months; the water storage level period is from the beginning of 10 months to the end of 10 months; the operation is carried out at a high water level of 175m from the beginning of 11 months to the end of 12 months (or the end of 1 month); the early 1 month to the end 5 months is the precipitation period. It can be seen that the reservoir low water level 145m is only from the beginning of 6 months to the end of 9 months, and the water is rapidly stored to the high water level of 175.0m at the beginning of 10 months.
When the underwater pier is constructed, the higher the water level, the deeper the construction water depth is, the more difficult the construction is, the higher the construction risk is, and the higher the construction cost is, and conversely, the lower the water level, the shallower the construction water depth is, the simpler the construction is, the smaller the construction risk is, and the lower the construction cost is. The bridge pier of the bridge engineering built in the reservoir area is located in the reservoir area water level fluctuation area, and the construction of the bridge pier is directly influenced by the reservoir area water level fluctuation. Generally, piers located in a reservoir area are constructed in a low water level period, namely 6 months to 10 months in the next year every year, in order to simplify construction, reduce construction risks and save construction cost. However, the quantity of foundation engineering of some piers is particularly large, construction cannot be completed in four months of 6 months to 10 months, some construction parties avoid high-water-level construction, and after the construction cannot be completed, the construction is stopped when the water level is high in the period of 10 months to next 5 months, and construction is performed when the water level is low in the period of 6 months to 10 months of the second year. Some piers are provided with a large number of prestressed steel bundles due to stress requirements, and the prestressed steel bundles are long, if the low water level period of the piers is not constructed in 6-10 months, the prestressed steel bundles arranged in the piers are soaked in water in 10-5 months next year without the protection of a concrete protective layer, so that the prestressed steel bundles can be soaked in water for half a year, and the prestressed steel bundles cannot be used after being corroded seriously by water bubbles. In order to protect the effectiveness of the prestressed steel strands, it is necessary to strictly protect the prestressed steel strands disposed within the pier.
SUMMERY OF THE UTILITY MODEL
In view of the shortcomings in the prior art, it is an object of the present invention to provide a protective structure for submerged prestressed steel strands located in a reservoir area. The protective structure effectively protects the prestressed steel bundles soaked in water, and ensures that the prestressed steel bundles are still effective in the construction of the next year in the low water level period. And in the first-stage low water level period, arranging a sleeve, a cover plate and a reinforcing structure outside the prestressed steel bundle to protect the prestressed steel bundle, and in the second-stage low water level period, removing and cutting off part of the side surface of the sleeve from the reinforcing structure, wherein the sleeve after the side surface is partially cut off can continue to serve as a stiff framework (serving as a stiff framework for binding steel bars and templates) for the subsequent construction of the bridge tower.
In order to solve the technical problems, the utility model is realized by the following technical scheme:
the utility model provides a protective structure of a submerged prestressed steel beam in a reservoir area, which comprises a pier foundation section in the reservoir area and a plurality of prestressed steel beams, wherein at least part of the lower sections of the prestressed steel beams are embedded into the pier foundation section; the sleeve, the cover plate and the reinforcing structure form a stable protection system for the prestressed steel bundles.
Preferably, the height of the top of each sleeve is higher than the highest water level in the reservoir area. Therefore, water can be prevented from permeating into the sleeve, and the height of the sleeve can meet the construction requirement of the upper section of the subsequent pier.
Preferably, the top height of the prestressed steel strands is located between the lowest water level and the highest water level in the reservoir area.
Preferably, the reinforcing structure comprises a first i-shaped steel column and a second i-shaped steel column, a flange on one side of the first i-shaped steel column extends into the sleeve along a clamping groove formed in the length direction of the sleeve, a gap is reserved between a flange on the other side of the first i-shaped steel column and a flange of another first i-shaped steel column correspondingly installed on an adjacent sleeve, and the second i-shaped steel column extends into the gap to clamp the flanges of the two first i-shaped steel columns together. One side of the first I-shaped steel column is clamped into the sleeve and fixedly connected with the sleeve, and the other side of the first I-shaped steel column is fixedly connected with the second I-shaped steel column, so that a stable supporting system is formed for the sleeve.
Further preferably, the lengths of the first i-shaped steel column, the second i-shaped steel column and the sleeve are the same. Therefore, the sleeve can be better reinforced by the first I-shaped steel column and the second I-shaped steel column.
Further preferably, at least part of the lower sections of the first i-shaped steel column and the second i-shaped steel column are embedded into the foundation section of the pier. The lower sections of the first I-shaped steel column and the second I-shaped steel column are embedded into the pier foundation section, so that the stability of the reinforced structure can be enhanced, the sleeve is integrally connected with the reinforced structure, and the structural stability is stronger.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
according to the utility model, the sleeve is sleeved on the outer side of each prestressed steel bundle, the cover plate is hermetically laid on the top of the sleeve, the sleeve is fixed by adopting the reinforcing structure, and a protection system for the prestressed steel bundles is formed among the sleeve, the cover plate and the reinforcing structure, so that the prestressed steel bundles with the constructed lower section part are better protected from being corroded by water bubbles within more than half a year of high water level in a reservoir area. And when the water level of the reservoir area in the second year is reduced to a low water level, the reinforcing structure is removed, and the side part of the sleeve is cut off, so that the sleeve can be continuously used as a stiff framework for the subsequent construction of the upper section of the pier. Therefore, the prestress of the constructed lower section part is well protected from being damaged, the sleeve for protecting the prestress steel beam is fully utilized, and the construction cost is saved to the maximum extent.
Drawings
Fig. 1 is a schematic view of a construction structure of a pier in a first low water level stage according to the present invention;
FIG. 2 is a schematic structural view of a construction section of a pier in a first low water level stage according to the present invention;
FIG. 3 is an enlarged view A of FIG. 2;
fig. 4 is a schematic view of a bridge pier construction completion structure according to the present invention.
Reference numerals: 1-bridge pier foundation section; 2-construction section lines of the bridge pier foundation sections; 3-upper section of bridge pier; 4-prestressed steel strands; 5-a sleeve; 6-cover plate; 7-reinforcing the structure; 51-a card slot; 52-a cutting line; 71-a first i-steel column; 72-a second i-steel column; 73-flanges.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The present invention will be further described with reference to the following examples and figures 1-4, but the utility model is not limited thereto.
Because the engineering quantity of some piers below 175.0m elevation high water level is too large, the construction cannot be completed in the period of 145.0m low water level in a reservoir area, the lower section of the prestressed steel beam 4 with the constructed lower section part is embedded in the lower section of the constructed pier foundation section 1, and the prestressed steel beam 4 with the upper section of the pier 3 without the constructed upper section can only be soaked in water.
As shown in fig. 1 to 3, in order to avoid the corrosion of the pre-stressed steel bundles 4 exposed outside the pier foundation section 1 caused by water soaking, the embodiment provides a protection structure of the submerged pre-stressed steel bundles 4 in a reservoir area, the protection structure includes sleeves 5, cover plates 6 and reinforcing structures 7, wherein the sleeves 5 are correspondingly sleeved on the pre-stressed steel bundles 4, the top of each sleeve 5 is hermetically laid with a cover plate 6, and each sleeve 5 is fixedly provided with a reinforcing structure; the sleeve 5, the cover plate 6 and the reinforcing structure 7 form a stable protection system for the prestressed steel strands 4.
Specifically, the sleeve 5 is made of a steel pipe with the diameter larger than the outer diameter of the prestressed steel beam 4, and the cover plate 6 is welded with the top opening of the sleeve 5 in a sealing mode through a steel plate; the reinforcing structure comprises a first I-shaped steel column 71 and a second I-shaped steel column 72, a flange 73 on one side of the first I-shaped steel column 71 extends into the sleeve 5 along a clamping groove 51 formed in the length direction of the sleeve 5, a gap is reserved between a flange 73 on the other side of the first I-shaped steel column 71 and a flange 73 of the other first I-shaped steel column 71 correspondingly mounted on the adjacent sleeve 5, and the second I-shaped steel column 72 extends into the gap to clamp the flanges 73 of the two first I-shaped steel columns 71 together. At least part of the lower sections of the sleeve 5, the first I-shaped steel column 71 and the second I-shaped steel column 72 are embedded into the pier foundation section 1. The first i-shaped steel column 71 and the second i-shaped steel column 72 can be selected according to the actual arrangement requirement of the on-site prestressed steel beam 4.
The heights of the first I-shaped steel column 71, the second I-shaped steel column 72 and the sleeve 5 need to be 1-2 m higher than the highest water level 175.0m of the reservoir area to prevent water in the reservoir area from entering the steel pipe to cause corrosion of the prestressed steel beam 4, meanwhile, a cover plate 6 is welded to the top of the sleeve 5 to prevent rainwater from entering the sleeve 5, so that a protection system is formed for the prestressed steel beam 4, and after the water level of the reservoir area rises to the high water level 175.0m, the prestressed steel beam 4 can be well protected. The height of the sleeve 5 is higher than the highest water level of the reservoir area, so that the sleeve 5 can serve as a stiff framework for the construction of the upper section 3 of the subsequent pier, the prestress steel beams 4 do not need to be rearranged, the cost is saved, and the construction period is shortened.
As shown in fig. 4, the embodiment further provides a pier construction method based on the protective structure, which includes the following steps:
s1, during the first low water level of the reservoir area, beginning to construct a pier foundation section 1 (the reference number 2 in the figure is a construction section line of the pier foundation section 1), and simultaneously embedding the lower section of the prestressed steel beam 4 in the pier foundation section 1, so that the top height of the prestressed steel beam 4 is positioned between the lowest water level and the highest water level in the reservoir area;
s2, after the construction of the pier foundation section 1 is completed, sleeving the sleeve 5 on the prestressed steel beam 4 exposed outside the pier foundation section 1, and simultaneously completing the arrangement of the reinforcing structure and the cover plate 6 to form a protection system;
specifically, the arrangement method of the reinforcing structure comprises the following steps: firstly, clamping a first I-shaped steel column 71 into a sleeve along a clamping groove 51 of the sleeve, then clamping flanges 73 of two adjacent first I-shaped steel columns 71 together through a second I-shaped steel column 72, welding and sealing the joint of the first I-shaped steel column 71 and the clamping groove 51, and finally pre-embedding the lower sections of the first I-shaped steel column 71 and the second I-shaped steel column 72;
the method for dismantling the reinforced structure comprises the following steps: partially or completely cutting the sleeve 5, the first i-shaped steel column 71 and the second i-shaped steel column 72 along a preset cutting line 52 as required, and recovering the first i-shaped steel column 71 and the second i-shaped steel column 72 to open at least part of the side wall of the sleeve 5;
s3, removing the reinforcing structure during the second low water level entering the reservoir area, and continuously serving the sleeve 5 as a stiff framework of the upper section 3 of the pier in the subsequent construction after derusting;
and S4, after the reinforcing structure is removed, continuously pouring and constructing the upper pier section 3 on the basis of the pier foundation section 1 until the construction of the whole pier is completed.
Further, the predetermined cutting line 52 on the sleeve 5 is located on the sleeve 5 where the flange 73 of the first i-shaped steel column 71 faces away from the prestressed steel bundle 4. In the process that the whole sleeve 5 is welded with the first I-shaped steel column 71 and the sleeve 5 is cut along the cutting line 52, the flange 73 of the first I-shaped steel column 71 always plays a role of a baffle, so that the prestressed steel beam 4 is effectively protected from being damaged.
Furthermore, after the reinforced structure is dismantled, the reinforced structure can be recycled, and the cost is saved.
According to the description and the drawings of the present invention, those skilled in the art can easily manufacture or use the protection structure of the pre-stressed water-immersed steel beam in the reservoir area and the construction method of the pier, and can produce the positive effects described in the present invention.
Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. Be located the protective structure of the prestressing steel bundle that soaks in reservoir area, including pier foundation section (1) and at least partial hypomere embedding pier foundation section (1) a plurality of prestressing steel bundles (4) in, its characterized in that are located reservoir area: and a sleeve (5) with at least part of lower section embedded into the pier foundation section (1) is sleeved outside each prestressed steel beam (4), and a cover plate (6) is hermetically laid on the top of each sleeve (5).
2. The shelter structure for pre-stressed water-immersed steel strands in a reservoir area as claimed in claim 1, wherein: the top height of each sleeve (5) needs to be higher than the highest water level in the reservoir area.
3. The shelter structure for pre-stressed water-immersed steel strands in a reservoir area as claimed in claim 2, wherein: the height of the top of each sleeve (5) needs to be 1-2 m higher than the highest water level in the reservoir area.
4. The shelter structure for pre-stressed water-immersed steel strands in a reservoir area as claimed in claim 1, wherein: the top height of the prestressed steel beams (4) is positioned between the lowest water level and the highest water level in the reservoir area.
5. The shelter structure for pre-stressed water-immersed steel strands in a reservoir area as claimed in claim 1, wherein: each sleeve (5) is fixedly provided with a reinforcing structure (7), each reinforcing structure (7) comprises a first I-shaped steel column (71) and a second I-shaped steel column (72), a flange (73) on one side of each first I-shaped steel column (71) extends into each sleeve (5) along a clamping groove (51) formed in the length direction of each sleeve (5), a gap is reserved between the flange (73) on the other side of each first I-shaped steel column (71) and the flange (73) of the other corresponding first I-shaped steel column (71) installed on the adjacent sleeve (5), and each second I-shaped steel column (72) extends into the gap to clamp the flanges (73) of the two first I-shaped steel columns (71) together.
6. The shelter structure for pre-stressed water-immersed steel strands in a reservoir area as claimed in claim 5, wherein: the lengths of the first I-shaped steel column (71), the second I-shaped steel column (72) and the sleeve (5) are the same.
7. The shelter structure for pre-stressed water-immersed steel strands in a reservoir area as claimed in claim 5, wherein: at least part of the lower sections of the first I-shaped steel column (71) and the second I-shaped steel column (72) are embedded into the pier foundation section (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121925330.3U CN215758501U (en) | 2021-08-17 | 2021-08-17 | Protection structure of immersed prestressed steel beam in reservoir area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121925330.3U CN215758501U (en) | 2021-08-17 | 2021-08-17 | Protection structure of immersed prestressed steel beam in reservoir area |
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| Publication Number | Publication Date |
|---|---|
| CN215758501U true CN215758501U (en) | 2022-02-08 |
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| CN202121925330.3U Active CN215758501U (en) | 2021-08-17 | 2021-08-17 | Protection structure of immersed prestressed steel beam in reservoir area |
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2021
- 2021-08-17 CN CN202121925330.3U patent/CN215758501U/en active Active
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