CN212561398U - Ultra-high performance concrete light U-shaped aqueduct body - Google Patents
Ultra-high performance concrete light U-shaped aqueduct body Download PDFInfo
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- CN212561398U CN212561398U CN202021847101.XU CN202021847101U CN212561398U CN 212561398 U CN212561398 U CN 212561398U CN 202021847101 U CN202021847101 U CN 202021847101U CN 212561398 U CN212561398 U CN 212561398U
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Abstract
The utility model discloses a light U-shaped aqueduct groove body of ultra high performance concrete, the groove body comprises ultra high performance concrete and the reinforcing bar buried therein underground, the groove body includes the back timber at cell wall and cell wall top, the cell wall is the U-shaped, the root of back timber is connected with the cell wall top through vertical section, cell wall thickness is not less than 30mm, the top beam width is 1.0-10.0 times of cell wall thickness, the thickness of back timber tip is 0.5-3.0 times of cell wall thickness, the thickness of back timber root is 1.0-6.0 times of cell wall thickness, the back timber area is 10% -30% of groove body cross section area, the straight section height of back timber is 0.2-1.0 times of groove body internal diameter, the aspect ratio of groove body is 0.55-1.0, the ratio of groove body height to cell wall thickness is 30-50; the reinforcing bar includes steel mesh piece and structure muscle, the steel mesh piece is located the cell wall, and the structure muscle is located the back timber. Through improving the material and the structural dimension of the groove body, the U-shaped aqueduct body which is lighter and thinner, more convenient to construct and higher in durability is obtained, and the problems of great weight and poor durability of the existing U-shaped groove are solved.
Description
Technical Field
The utility model relates to a hydraulic engineering technical field, in particular to light U-shaped aqueduct body of ultra high performance concrete.
Background
In the middle of the twentieth century, because China laggard behind water conservancy facilities and rural development is restricted, diversion irrigation becomes a prominent civil engineering which gets rid of the dilemma, and under the background, aqueducts begin to be constructed on a large scale all over the country. The aqueduct is used as an overhead water delivery structure which can cross river channels, roads, mountain rushes, valley mouths and the like, is used for delivering canal water for farmland irrigation, urban domestic water, industrial water, water transfer across drainage basins and the like, and can also be used for flood drainage and diversion. In addition, the aqueduct can also bring long-term water source support to some areas lacking water, so as to improve local water circulation and improve the natural environment of the areas.
At present, the development of the U-shaped aqueduct in China is in the following trend: the construction aspect tends to be prefabricated and factory-made, and the structure forms which are suitable for various flows and various spans, particularly large spans, are rapidly produced in batches; the material trend is towards the use of steel-concrete or fibre reinforced concrete; for large cast-in-place concrete U-shaped grooves, a bidirectional prestress groove body structure is used to improve the crack resistance and reduce the wall thickness.
According to the regulation of the existing national standard GB 50288 plus 2018 irrigation and drainage engineering design standard, the top end of the wall of a U-shaped groove body is enlarged to form a top beam, the area of the top beam is 15% -18% of the cross section area of the groove body, the ratio of the height of the groove body to the thickness of the groove wall is 15-20, the depth-width ratio of a beam-type U-shaped groove body is 0.7-0.9, the arch-shaped U-shaped groove body can be reduced, for the U-shaped groove body with the span-width ratio of more than or equal to 4, the arc section of the groove bottom is thickened and is limited by the defect of low strength of common concrete, the design of the U-shaped groove is conservative, a bidirectional prestress groove body structure is often adopted in a large concrete aqueduct to improve the bearing capacity and crack resistance of the groove body, the common concrete U-shaped groove has the problems of poor durability, concrete on the structure surface is easy to peel off, the reinforcing steel bar is easy, 10% of the aqueducts have substantially failed and 7% of the aqueducts have been declared obsolete. In addition, although the steel wire mesh cement thin-wall U-shaped groove can also achieve the effect of thin wall and light weight, the traditional steel wire mesh cement U-shaped groove is generally formed by manually plastering mortar, and the strength of the cement mortar is far lower than that of ultra-high performance concrete. Therefore, the existing U-shaped aqueduct has the following problems: (1) the self weight of the tank body is large, so that the transportation, the lifting and the installation are difficult. (2) The strength of common concrete is low, and a bidirectional prestressed trough body structure is often adopted in a large concrete aqueduct, so that the construction difficulty is undoubtedly increased. (3) The durability of the tank body is poor, particularly the seepage-proofing, frost-resisting and durability of the steel wire mesh cement U-shaped tank are poor, and the problems of reinforcing steel bar corrosion and the like caused by water seepage frequently occur.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a light U-shaped aqueduct groove body of ultra high performance concrete, improve through material and the structural dimension to the groove body, under the prerequisite of guaranteeing operation safety, obtain more frivolous, the construction is more convenient, the higher U-shaped aqueduct groove body of durability, solved current U-shaped groove from great, the poor problem of durability.
The technical scheme of the utility model is that: a light U-shaped aqueduct body of ultra-high performance concrete, the said trough body is made up of ultra-high performance concrete and steel reinforcement buried therein, the trough body includes cell wall and top cap of cell wall, the cell wall is U-shaped, the root of the top cap is connected with top of cell wall through the vertical section, the thickness of cell wall is not smaller than 30mm, the width of the top cap is 1.0-10.0 times of the thickness of cell wall, the thickness of end of the top cap is 0.5-3.0 times of the thickness of cell wall, the thickness of root of the top cap is 1.0-6.0 times of the thickness of cell wall, the area of the top cap is 10% -30% of the cross sectional area of the trough body, the height of the straight section of the top cap is 0.2-1.0 times of the internal diameter of the trough body, the depth-to-width ratio of the trough body is 0.55-; the reinforcing bar includes steel mesh piece and structure muscle, the steel mesh piece is located the cell wall, and the structure muscle is located the back timber.
Further, still include a plurality of pull rods, a plurality of railings are along the vertical interval distribution of groove body, and the both ends of pull rod are connected with the back timber respectively, and the interval between two adjacent pull rods is 1.0 ~ 2.5 meters, and pull rod thickness is not less than 30mm, and the pull rod width is 60 ~ 200mm, is equipped with the steel wire that excels in the pull rod, and the steel wire that excels in is connected for the annular reinforcing bar with the steel mesh piece.
Furthermore, set up the railing on the back timber, erect the guidance tape between two adjacent pull rods, guidance tape and railing all adopt ultra high performance concrete to make.
Furthermore, the longitudinal two ends of the groove body are respectively provided with an end rib support, the end rib supports are positioned on the outer side of the groove wall, and the outer contour of each end rib support is trapezoidal or zigzag.
Furthermore, the end rib supports at the two ends of the groove body are respectively provided with a socket and a spigot, and an expansion joint of 20mm is reserved between the socket and the spigot.
Furthermore, the span-width ratio of the groove body is larger than or equal to 6, the arc-shaped section at the bottom of the groove wall is thickened, the thickness of the middle line is 0.5-3.0 times of the thickness of the groove wall, and the width of the middle line is 0.3-0.8 times of the inner diameter of the groove body.
Furthermore, the compressive strength of the ultra-high performance concrete is not lower than 100MPa, the ultimate tensile strength of the elasticity is not lower than 5MPa, and the elastic modulus is not lower than 40 GPa.
Furthermore, the steel fiber with the volume doping amount of 1-4% is doped in the ultra-high performance concrete, and the steel fiber is a micro steel fiber with the diameter of 0.15-0.4 mm.
Furthermore, organic fibers with the volume doping amount of 0.1-0.6% are doped in the ultra-high performance concrete, and the organic fibers are polyvinyl alcohol fibers, high-elasticity modulus polyethylene fibers or carbon fibers.
Further, the total reinforcement ratio of the groove body is 1.5% -8%, the thickness of the steel bar protective layer is not less than 10mm, the steel mesh is formed by preprocessing hot-rolled ribbed steel bars, cold-rolled ribbed steel bars, high-strength steel bars or high-strength steel wires, and the aperture diameter of the steel mesh is 40-80 mm.
The utility model discloses a light U-shaped aqueduct body of ultra high performance concrete for prior art, has following beneficial effect:
(1) the ultra-high performance concrete is applied to the U-shaped aqueduct body, the thickness of the wall of the aqueduct can be greatly reduced, the ratio of the height of the aqueduct body to the thickness of the wall of the aqueduct is improved to 30-50, the mass of the aqueduct body is only 20-45 percent of that of a common concrete U-shaped aqueduct under the same hydraulic condition, and the difficult problem of construction and transportation is effectively solved.
(2) Because ultrahigh strength and the high tenacity characteristics of ultra high performance concrete can reduce prestressed tendons's use through high arrangement of reinforcement rate, generally speaking, need not adopt prestressed tendons to small-size aqueduct, only need arrange vertical prestressed tendons to big-and-middle-sized aqueduct, do not need horizontal prestressed tendons, consequently the utility model discloses reducible prestressed tendons's use does not adopt prestressed tendons or only adopts vertical prestressed tendons, effectively solves the complicated problem of prestressed tendons construction.
(3) The groove body durability is better, the utility model discloses an ultra high performance concrete's impervious, freeze proof, wear-resisting, anti erosion, anti crack performance are far greater than ordinary concrete, have effectively solved traditional concrete or wire net cement mortar aqueduct because of the poor problem of life of durability.
(4) Although the unit raw material cost of the ultra-high performance concrete aqueduct is higher than that of the traditional aqueduct, the ultra-high performance concrete aqueduct engineering has higher full life cycle economy by comprehensively considering the factors of reducing the labor amount, reducing the material loss, shortening the construction period, reducing the requirements on transportation and construction machinery, enhancing the durability of buildings, reducing the long-term maintenance cost, saving energy, protecting environment and the like.
Drawings
Fig. 1 is a schematic structural view of the aqueduct body of the utility model.
Fig. 2 is a side view of the aqueduct body of the utility model.
Fig. 3 is a cross-sectional view of the middle part of an aqueduct of embodiment 2 of the present invention.
1-a pull rod; 2-top beam; 3-groove wall; 4-thickening section; 5-end ribs; 6-sidewalk footplate; 7-a socket; 8-socket; 101-constructing a rib; 102-steel mesh sheet; 103-high strength steel wire.
Detailed Description
The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.
Example 1
The embodiment provides a light U-shaped aqueduct body of ultra-high performance concrete, and the aqueduct body consists of the ultra-high performance concrete and reinforcing steel bars embedded in the ultra-high performance concrete.
As shown in fig. 1, 2 and 3, the groove body includes a groove wall and a top beam at the top of the groove wall, the groove wall is U-shaped, the root of the top beam is connected with the top of the groove wall through a vertical section, the thickness of the groove wall is not less than 30mm, the width of the top beam is 1.0-10.0 times of the thickness of the groove wall, the thickness of the end of the top beam is 0.5-3.0 times of the thickness of the groove wall, the thickness of the root of the top beam is 1.0-6.0 times of the thickness of the groove wall, the area of the top beam is 10% -30% of the cross section area of the groove body, the height of the vertical section of the top beam is 0.2-1.0 times of the inner diameter of the groove body, the depth-width ratio of the. In the embodiment, the longitudinal span of the single span of the groove body is 10m, the inner diameter of the groove body is 800mm, the outer diameter is 840mm, and the wall thickness of the groove is 40 mm; the width of the top beam is 110mm which is 2.75 times of the thickness of the groove wall, the thickness of the end part of the top beam is 120mm which is 3 times of the thickness of the groove wall, the thickness of the root part of the top beam is 230mm which is 5.75 times of the thickness of the groove wall, and the area of the top beam is 12.6 percent of the cross section area of the groove body; the height of the vertical section is 450mm, which is 0.56 times of the inner diameter of the groove body; the depth-to-width ratio of the water passing section of the groove body is 0.81, and the ratio of the height of the groove body to the thickness of the groove wall is 32.25. The span-width ratio of the groove body is 5.26 and less than 6, and the arc-shaped section at the bottom of the groove body does not need to be thickened.
As shown in figures 1, 2 and 3, a plurality of railings are distributed at intervals along the longitudinal direction of the groove body, two ends of each pull rod are respectively connected with the top beam, the distance between every two adjacent pull rods is 1.0-2.5 m, the thickness of each pull rod is not less than 30mm, the width of each pull rod is 60-200 mm, and high-strength steel wires are arranged in the pull rods. The top beam is provided with a railing, a sidewalk plate is erected between two adjacent pull rods, and the sidewalk plate and the railing are both made of ultra-high performance concrete. In this embodiment, the tie bar spacing is 1500mm, the tie bar length is 1600mm, the width is 100mm, and the height is 80mm, the length of the sidewalk board is 1420mm, the width of the board is 600mm, and the height of the board is 40 mm.
As shown in fig. 1, 2 and 3, the two longitudinal ends of the groove body are respectively provided with an end rib support, the end rib supports are positioned outside the groove wall, the outer contour of the end rib support is trapezoidal or zigzag, the end rib supports at the two ends of the groove body are respectively provided with a socket and a spigot, and an expansion joint of 20mm is reserved between the socket and the spigot.
As shown in fig. 1, 2 and 3, the steel bar comprises a steel mesh sheet and a structural bar, the steel mesh sheet is positioned in the groove wall, the structural bar is positioned in the top beam, the total bar distribution rate of the groove body is 1.5% -8%, the thickness of the steel bar protective layer is not less than 10mm, the steel mesh sheet is formed by preprocessing hot-rolled ribbed steel bars, cold-rolled ribbed steel bars, high-strength steel bars or high-strength steel wires, and the aperture of the steel mesh sheet is 40-80 mm. In this embodiment, the steel mesh sheet in the slot wall is formed by preprocessing high-strength steel wires, the tensile strength standard value of the steel wires is 1420MPa, the diameter of the steel wires is 7mm, the steel wires are woven into steel mesh sheets with the aperture of 50mm, the protective layer of the steel mesh sheet is 15mm, and the steel mesh sheet and the high-strength steel wires in the pull rods are connected into annular steel bars.
The steel fiber with the volume doping amount of 1-4% is doped in the ultra-high performance concrete, and the steel fiber is a micro steel fiber with the diameter of 0.15-0.4 mm. In this example, the compressive strength of the ultra-high performance concrete material of the groove body was 120MPa, the proof stress of the elastic limit was 7MPa, the elastic modulus was 43GPa, and the chloride ion mobility coefficient was 0.02X 10-12m2And/s, the volume mixing amount of the micro steel fiber is 2.0 percent. The steel fiber is doped, so that the toughness of the concrete is improved, and the tensile strength is further improved.
The embodiment meets the structural bearing capacity and the anti-cracking checking calculation, the stability is good, the side twisting and buckling damage does not occur, the single-span dead weight is about 11.29t, compared with a C25 prestressed concrete structure adopted in the prior art, the single-span dead weight is about 29.91t, the dead weight of the embodiment is 37.74 percent of the dead weight of the prior art, and the strength and the durability of the groove body are better.
Example 2
The difference between the present embodiment and embodiment 1 is that the ultra-high performance concrete is doped with organic fibers with a volume content of 0.1-0.6%, and the organic fibers are polyvinyl alcohol fibers, high elastic modulus polyethylene fibers or carbon fibers. By doping the organic fiber, the toughness of the concrete is improved, and the tensile strength is further improved.
As shown in FIG. 3, the aspect ratio of the groove body is greater than or equal to 6, the arc-shaped section at the bottom of the groove wall is thickened, the thickness of the center line of the arc-shaped section is 0.5-3.0 times of the thickness of the groove wall, the width of the bottom of the arc-shaped section is 0.3-0.8 times of the inner diameter of the groove body, in this embodiment, the thickness of the center line of the arc-shaped section is 50mm, and the width of the bottom of the arc-shaped section is 400 mm.
As described above, the present invention can be realized well, and the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all equivalent changes and modifications made according to the present invention are intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. The ultra-high performance concrete light U-shaped aqueduct tank body is characterized in that the tank body consists of ultra-high performance concrete and reinforcing steel bars embedded in the ultra-high performance concrete, the tank body comprises a tank wall and a top beam at the top of the tank wall, the tank wall is U-shaped, the root of the top beam is connected with the top of the tank wall through a vertical section, the thickness of the tank wall is not less than 30mm, the width of the top beam is 1.0-10.0 times of the thickness of the tank wall, the thickness of the end part of the top beam is 0.5-3.0 times of the thickness of the tank wall, the thickness of the root of the top beam is 1.0-6.0 times of the thickness of the tank wall, the area of the top beam is 10-30% of the cross section area of the tank body, the height of the vertical section of the top beam is 0.2-1.0 time of the inner diameter of the tank;
the reinforcing bar includes steel mesh piece and structure muscle, the steel mesh piece is located the cell wall, and the structure muscle is located the back timber.
2. The ultra-high performance concrete light U-shaped aqueduct body of claim 1, further comprising a plurality of pull rods, wherein a plurality of railings are distributed at intervals along the longitudinal direction of the body, two ends of each pull rod are respectively connected with the top beam, the distance between every two adjacent pull rods is 1.0-2.5 m, the thickness of each pull rod is not less than 30mm, the width of each pull rod is 60-200 mm, high-strength steel wires are arranged in the pull rods, and the high-strength steel wires are connected with the steel mesh to form annular steel bars.
3. The ultra-high performance concrete light U-shaped aqueduct body as claimed in claim 1, wherein the top beam is provided with a handrail, a sidewalk plate is erected between two adjacent pull rods, and the sidewalk plate and the handrail are made of ultra-high performance concrete.
4. The ultra-high performance concrete light U-shaped aqueduct body as claimed in claim 1, wherein the longitudinal ends of the aqueduct body are respectively provided with an end rib support, the end rib supports are positioned outside the aqueduct wall, and the outer contour of the end rib supports is trapezoidal or zigzag.
5. The ultra-high performance concrete light U-shaped aqueduct body as claimed in claim 4, wherein the end rib supports at both ends of the body are respectively provided with a socket and a spigot, and an expansion joint of 20mm is reserved between the socket and the spigot.
6. The ultra-high performance concrete light U-shaped aqueduct body as claimed in claim 1, wherein the width-to-width ratio of the aqueduct body is greater than or equal to 6, the arc-shaped section of the bottom of the aqueduct wall is thickened, the thickness of the midline is 0.5-3.0 times of the thickness of the aqueduct wall, and the width is 0.3-0.8 times of the inner diameter of the aqueduct body.
7. The ultra-high performance concrete light U-shaped aqueduct body of claim 1, wherein the ultra-high performance concrete has a compressive strength of not less than 100MPa, an ultimate tensile strength of not less than 5MPa, and an elastic modulus of not less than 40 GPa.
8. The ultra-high performance concrete light U-shaped aqueduct body as claimed in claim 1, wherein steel fiber with volume content of 1-4% is doped in the ultra-high performance concrete, and the steel fiber is micro steel fiber with diameter of 0.15-0.4 mm.
9. The ultra-high performance concrete light U-shaped aqueduct body as claimed in claim 1, wherein organic fiber with volume content of 0.1-0.6% is doped in the ultra-high performance concrete, and the organic fiber is polyvinyl alcohol fiber, high elastic modulus polyethylene fiber or carbon fiber.
10. The ultra-high performance concrete light U-shaped aqueduct tank body of claim 1, wherein the total reinforcement ratio of the tank body is 1.5-8%, the thickness of the steel bar protective layer is not less than 10mm, the steel mesh is formed by preprocessing hot-rolled ribbed steel bars, cold-rolled ribbed steel bars, high-strength steel bars or high-strength steel wires, and the aperture of the steel mesh is 40-80 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111962472A (en) * | 2020-08-28 | 2020-11-20 | 华南理工大学 | Ultra-high performance concrete light U-shaped aqueduct body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111962472A (en) * | 2020-08-28 | 2020-11-20 | 华南理工大学 | Ultra-high performance concrete light U-shaped aqueduct body |
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