CN216809522U - Concrete work bridge of large-span prestressed flood gate opening and closing gate - Google Patents
Concrete work bridge of large-span prestressed flood gate opening and closing gate Download PDFInfo
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- CN216809522U CN216809522U CN202220278050.6U CN202220278050U CN216809522U CN 216809522 U CN216809522 U CN 216809522U CN 202220278050 U CN202220278050 U CN 202220278050U CN 216809522 U CN216809522 U CN 216809522U
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Abstract
The utility model discloses a concrete work bridge of a large-span prestressed flood gate opening and closing gate, and relates to the technical field of hydraulic and hydroelectric engineering. The prestressed working bridge comprises a pier stud, a prestressed working bridge and bridge cranes, wherein a bridge crane track is pre-embedded in the prestressed working bridge, a pre-tensioned steel strand is arranged in the prestressed working bridge, the prestressed working bridge is of a T-shaped section, and rib plates are arranged on two sides of the prestressed working bridge at intervals. The method fully utilizes the higher tensile property of the pre-tensioned steel strand in the tensioned region, and can reduce the deflection deformation of the working bridge by about 6mm and reduce the proportion by about 15 percent according to the comparison and selection calculation result of a scheme, thereby reducing or avoiding the cracking degree of the concrete in the tensioned region.
Description
Technical Field
The utility model relates to the technical field of water conservancy and hydropower engineering, in particular to a concrete working bridge of a large-span prestressed flood gate opening and closing gate,
background
The sluice mainly depends on the gate to adjust the water level of the upper and lower parts, the sluice working bridge is designed to facilitate the crane and the lifting of the gate, and the sluice working bridge is divided into a steel beam working bridge and a concrete beam working bridge according to the material; the sluice working bridge that is less to the span generally adopts cast in situ concrete working bridge, the great steel working bridge that adopts of span, but steel working bridge later maintenance cost is higher, and has metal fatigue and bolt not hard up risk, needs often to arrange technical staff to detect or carry out anti-corrosion maintenance.
From the atress angle, concrete working bridge section size and span and upper portion headstock gear remove the load all have the relation, and the span is big more, and upper portion bridge crane removes the load big more, and then concrete section size is big more, and the consequence that brings is that cast-in-place working bridge dead weight also is big more, and the arrangement of reinforcement is more, leads to the working bridge atress condition relatively poor and the engineering investment is great.
Under the condition of large span and upper load of the cast-in-place concrete working bridge, cracks are easy to generate, which indicates that the concrete in the tensile area of the working bridge reaches the design value of the tensile strength at the moment, but the tensile steel bar does not reach the design value of the tensile strength of the steel bar, namely the tensile property of the steel bar is not fully utilized, and the cracks appear in the tensile area of the concrete, namely the stress defect of the cast-in-place concrete working bridge.
In order to solve the problems, it is necessary to develop a concrete working bridge of a large-span prestressed flood gate opening and closing gate.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the background technology and provide a concrete working bridge of a large-span prestressed flood gate opening and closing gate.
In order to achieve the purpose, the technical scheme of the utility model is as follows: the concrete work bridge of gate is opened and close to large-span prestressing force flood gate, including pier stud, prestressing force work bridge and bridging machine, prestressing force work bridge is located bridging machine both ends, and prestressing force work bridge end is located the pier stud, its characterized in that:
a bridge crane track is pre-embedded in the top of the prestressed working bridge, a plurality of pre-tensioned steel strands are arranged in the prestressed working bridge, the prestressed working bridge is of a T-shaped section, and rib plates are arranged on two sides of the prestressed working bridge at intervals.
In the technical scheme, the pre-tensioning steel strand comprises a working section extending out of the prestressed working bridge, an inclined section located in the end part of the prestressed working bridge, a straight section located in the prestressed working bridge and an arc section located between the inclined section and the straight section.
In the technical scheme, the end part of the prestressed working bridge is provided with the support, the support is a rectangular section, and two sides of the support are attached to the pier stud.
In the technical scheme, the bottom of the support is connected with an GJZ support through a concrete wedge block, a support cushion stone is arranged at the bottom of the GJZ support, and the concrete wedge block and the support are integrally cast.
In the technical scheme, a steel plate is embedded in the contact surface of the concrete wedge block and the GJZ support.
In the technical scheme, a pedestrian passageway is arranged on the outer side of the prestressed working bridge.
In the technical scheme, the pre-tensioned steel strand comprises six rows, namely a first row, a second row, a third row, a fourth row, a fifth row and a sixth row from top to bottom, wherein each row is provided with a plurality of pre-tensioned steel strands.
In the technical scheme, the strength grade of the prestressed working bridge is C50; the pre-tensioning steel strand is a 15.2mm steel strand, the tensile standard strength is more than or equal to 1960MPa, and the tensioning control stress of 80 percent sigma con is more than or equal to 1568 MPa.
Compared with the prior art, the utility model has the following advantages:
1) the utility model fully utilizes the higher tensile property of the pre-tensioned steel strand in the tension area, and can reduce the deflection deformation of the working bridge by about 6mm and reduce the proportion by about 15 percent according to the scheme comparison and selection calculation result, thereby reducing or avoiding the cracking degree of the concrete in the tension area.
2) The utility model considers the stress characteristic of the working bridge, the rail wheel pressure is transmitted to the lower tension area through the vertical structure of the rail beam, the rail beam adopts a T-shaped section, the section area is smaller, and the volume of the working bridge is reduced by 120m according to the calculation result of scheme selection3The reduction ratio is about 50%, and the self weight of the working bridge is greatly reduced.
3) The cross section size of the T-shaped beam structure can be changed according to the size of the upper moving load, and the total wheel pressure of the upper single-side moving load can be increased by 100 plus materials and 200T by increasing or reducing the number of the post-tensioning steel strand strands, and the crack and the deflection of the working bridge are within the standard safety value.
Drawings
FIG. 1 is a schematic view of the present invention.
Fig. 2 is a schematic structural view of the end of the prestressed working bridge according to the present invention.
FIG. 3 is a schematic structural view of a rib plate of the prestressed working bridge of the present invention.
Fig. 4 is a schematic structural diagram of the prestressed working bridge body of the present invention.
Fig. 5 is a schematic longitudinal section through a prestressed working bridge according to the utility model.
Fig. 6 is a schematic structural view of the stand of the present invention.
Fig. 7 is a schematic structural view of a concrete wedge block, GJZ stand and a steel plate.
The device comprises a pier stud 1, a prestressed working bridge 2, a bridge crane rail 21, a pretensioning steel strand 22, a working section 221, an inclined section 222, a straight section 223, a circular arc section 224, a ribbed plate 23, a support 24, a concrete wedge block 241, a support 242-GJZ, a support 243, a support base stone 244, a steel plate 251, a first row 252, a second row 253, a third row, a fourth row 254, a fifth row 255, a sixth row 256 and a bridge crane 3.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the utility model will be clear and readily understood by the description.
With reference to the accompanying drawings: large-span prestressing force keeps off concrete work bridge that floodgate opened and close gate, including pier stud 1, prestressing force work bridge 2 and bridge crane 3, prestressing force work bridge 2 is located 3 both ends of bridge crane, and 2 tip of prestressing force work bridge are located pier stud 1, its characterized in that:
a bridge crane track 21 is pre-embedded in the top of the prestressed working bridge 2, a plurality of pre-tensioned steel strands 22 are arranged in the prestressed working bridge 2, the prestressed working bridge 2 is of a T-shaped section, and rib plates 23 are arranged on two sides of the prestressed working bridge 2 at intervals.
As shown in fig. 5, the pre-tensioned strand 22 includes a working section 221 extending out of the prestressed working bridge 2, an inclined section 222 located in the end of the prestressed working bridge 2, a straight section 223 located in the prestressed working bridge 2, and a circular arc section 224 located between the inclined section 222 and the straight section 223.
The end part of the prestressed working bridge 2 is provided with a support 24, the support 24 is a rectangular section, and two sides of the support 24 are attached to the pier stud 1.
As shown in fig. 6, the bottom of the support 24 is connected GJZ with the support 242 through a concrete wedge 241, the support pad 243 is arranged at the bottom of the GJZ support 242, and the concrete wedge 241 is poured integrally with the support 24.
The steel plate 244 is embedded in the contact surface of the concrete wedge 241 and the GJZ support 242.
And a pedestrian passage is arranged on the outer side of the prestressed working bridge 2.
As shown in fig. 2, the pre-tensioned steel strands 22 have six rows, which are a first row 251, a second row 252, a third row 253, a fourth row 254, a fifth row 255 and a sixth row 256 from top to bottom, and each row has a plurality of pre-tensioned steel strands 22.
The strength grade of the prestressed working bridge 2 is C50; the pre-tensioning steel strand 22 is a 15.2mm steel strand, the tensile standard strength is more than or equal to 1960MPa, and the tensioning control stress 80% sigma con is more than or equal to 1568 MPa.
The construction method of the concrete working bridge of the large-span prestressed flood gate opening and closing gate is characterized by comprising the following steps:
after the prestressed working bridge 2 is cast, when the concrete strength and the elastic modulus of the prestressed working bridge 2 reach 85% of the design values and the age is not less than 7d, the pretensioned steel strands 22 are symmetrically and uniformly tensioned through two ends of the working section 221, and the elongation of the pretensioned steel strands 22 is a theoretical calculation value after initial tension is deducted.
The tensioning sequence of the pre-tensioning steel strand 22 is as follows: fourth row 254, third row 253, fifth row 255, second row 252, sixth row 256, first row 251.
Examples
Introduction of background art in connection with certain engineering: in order to solve the problems of flood control, dyke top communication and branch flood drainage, the existing conditions are combined, a flood blocking water gate needs to be built at the junction of the branch and the main stream, and a flood control traffic bridge is arranged. Closing the flood barrier gate when the main flow is high in water level in the flood season, and preventing flood from flowing backwards into the branch; when the water level is normal, the branch water level is higher than the main water level, and the flood blocking gate is opened to drain the stagnant water automatically.
According to the design code of embankment engineering (GB50286-2013), the main flow embankment is a level 1 building, and considering that the flood barrier is located on the important flood barrier of the main flow embankment, the level of the flood barrier building is consistent with that of the embankment, and is level 1, and the level of the secondary building is level 3.
The flood barrier gate chamber comprises a gate warehouse, side piers, a middle pier, a gate chamber bottom plate and the like, and has two holes in total, the net width of each hole is 30m, the width of the middle pier is 5.02m, the flood barrier gate is a laminated beam gate, the gate warehouse is arranged on two sides of the side piers, a planar steel gate is adopted, the top height of the gate is 15.00m, and the top height of the gate is consistent with that of a dry flow dike; the gate is lifted by adopting a travelling crane, buttress piers are uniformly distributed on the gate warehouse, the side piers and the middle pier, the prestressed working bridge 2 adopts a prestressed T-shaped track beam according to the span, the top of the prestressed working bridge is embedded with a bridge crane track 21, the travelling crane is installed, the height of the buttress top is 22.10m, and the height of the prestressed working bridge 2 is 2.5 m.
The concrete strength grade of the prestressed working bridge 2 is C50, in order to reduce the deflection deformation of the prestressed working bridge 2 across a door house section and a gate hole section and improve the crack resistance, a post-tensioning steel strand is designed, the pre-tensioning steel strand 22 adopts a 15.2mm high-strength low-relaxation steel strand of a standard prestressed concrete steel strand (GB/T5224-2014), the tensile standard strength is not less than 1960MPa, and the tension control stress of 80 percent sigma con is not less than 1568 MPa.
In the construction process of the prestressed working bridge 2, a full scaffold supporting template is adopted, after the prestressed working bridge 2 is poured and formed, the concrete strength and the elastic modulus of the prestressed working bridge 2 reach 85% of the design values, the age is not less than 7d, and the prestressed tension steel strand 22 can be tensioned; the pre-tensioning steel strand 22 is symmetrically and uniformly tensioned at two ends of the working section 221, and tension force and stretching amount are controlled in a double mode; the tensioning sequence of the pre-tensioning steel strand 22 is as follows: fourth row 254, third row 253, fifth row 255, second row 252, sixth row 256, first row 251; the radius of the circular arc segment 224 is 35m, and the central angle is 9 degrees.
The elongation of the pre-tensioned steel strand 22 is a theoretical calculation value after initial tension (10%) is deducted, the pipeline friction coefficient mu is 0.25, the deviation coefficient kappa is 0.0015, and the pre-tensioned pipeline is a corrugated pipe; when the anchor backing plate is installed, it is ensured that the anchoring surface is perpendicular to the pre-tensioned steel strand 22.
The pre-tensioning steel strand 22 is pre-tensioned through a post-tensioning method, and the higher tensile property of the pre-tensioning steel strand 22 in a tension area is fully utilized, so that the cracking degree of concrete in the tension area is reduced or avoided.
The prestressed working bridge 2 adopts a T-shaped section, and rib plates 23 are arranged at intervals to enhance the integral rigidity of the bridge body; the end part of the prestressed working bridge 2 is a rectangular section so as to increase the contact surface between the foundation and the support 24, and the side part of the prestressed working bridge is attached to the stop block of the pier stud 1 so as to enhance the anti-overturning capability of the prestressed working bridge 2 under the action of the transverse horizontal force.
In conclusion, the utility model solves the problems of crack resistance, overturn resistance, reduced deflection deformation and the like under the conditions of large span and large upper load of the current cast-in-place concrete working bridge.
Other parts not described belong to the prior art.
Claims (7)
1. Large-span prestressing force keeps off concrete work bridge that floodgate opened and close gate, including pier stud (1), prestressing force work bridge (2) and bridge crane (3), prestressing force work bridge (2) are located bridge crane (3) both ends, and prestressing force work bridge (2) tip is located pier stud (1), its characterized in that:
a bridge crane track (21) is pre-buried in the top of the prestressed working bridge (2), a plurality of pre-tensioned steel strands (22) are arranged in the prestressed working bridge (2), the prestressed working bridge (2) is of a T-shaped section, and rib plates (23) are arranged on two sides of the prestressed working bridge (2) at intervals.
2. The concrete working bridge of the large-span prestressed flood gate opening and closing gate according to claim 1, is characterized in that: the pre-tensioning steel strand (22) comprises a working section (221) extending out of the prestressed working bridge (2), an inclined section (222) located in the end portion of the prestressed working bridge (2), a straight line section (223) located in the prestressed working bridge (2) and an arc section (224) located between the inclined section (222) and the straight line section (223).
3. The concrete working bridge of the large-span prestressed flood gate opening and closing gate of claim 2, is characterized in that: prestressing force working bridge (2) tip has support (24), support (24) are the rectangle section, and support (24) both sides and pier stud (1) laminating.
4. The concrete working bridge of the large-span prestressed flood gate opening and closing gate of claim 3, wherein: the bottom of the support (24) is connected with an GJZ support (242) through a concrete wedge block (241), a support cushion stone (243) is arranged at the bottom of the GJZ support (242), and the concrete wedge block (241) is integrally cast with the support (24).
5. The concrete working bridge of the large-span prestressed flood gate opening and closing gate of claim 4, wherein: and a steel plate (244) is embedded in the contact surface of the concrete wedge block (241) and the GJZ support (242).
6. The concrete working bridge of the large-span prestressed flood gate opening and closing gate of claim 5, wherein: and a pedestrian passage is arranged on the outer side of the prestressed working bridge (2).
7. The concrete working bridge of the large-span prestressed flood gate opening and closing gate of claim 6, wherein: the pre-tensioning steel strand (22) is provided with six rows, the six rows are sequentially a first row (251), a second row (252), a third row (253), a fourth row (254), a fifth row (255) and a sixth row (256) from top to bottom, and each row is provided with a plurality of pre-tensioning steel strands (22).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220278050.6U CN216809522U (en) | 2022-02-11 | 2022-02-11 | Concrete work bridge of large-span prestressed flood gate opening and closing gate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220278050.6U CN216809522U (en) | 2022-02-11 | 2022-02-11 | Concrete work bridge of large-span prestressed flood gate opening and closing gate |
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| Publication Number | Publication Date |
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| CN216809522U true CN216809522U (en) | 2022-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220278050.6U Active CN216809522U (en) | 2022-02-11 | 2022-02-11 | Concrete work bridge of large-span prestressed flood gate opening and closing gate |
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| CN (1) | CN216809522U (en) |
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