CN102587268B - Masonry arch bridge using lightweight concrete as arch filler - Google Patents
Masonry arch bridge using lightweight concrete as arch filler Download PDFInfo
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- CN102587268B CN102587268B CN201210105040.3A CN201210105040A CN102587268B CN 102587268 B CN102587268 B CN 102587268B CN 201210105040 A CN201210105040 A CN 201210105040A CN 102587268 B CN102587268 B CN 102587268B
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Abstract
The invention discloses a masonry arch bridge using lightweight concrete as arch filler. The masonry arch bridge comprises a main arch ring (1), a spandrel arch (3) and an arch filler layer (2) and is characterized in that the arch filler layer (2) is a lightweight concrete filler layer, and the apparent density of the lightweight concrete filler layer is 800kg/m<3>-1950kg/m<3>; a leveling layer (4) is arranged on the top surface of the arch filler layer (2); a waterproof layer (7) is arranged between the main arch ring (1) and the arch filler layer (2); and saw joints (5) are arranged along the transverse direction of the bridge; and water permeating pipes (6) are arranged in the lowest position of each filler formed by the pairwise saw joints (5) and at two sides of a side wall. The waterproof layer (7) is formed by laying a permanent condensate or asphalt. The masonry arch bridge has the advantages that the stress of the arch can be effectively improved, the internal force of a dead load is reduced, and the carrying capacity of a bearing live load of the masonry arch bridge is increased.
Description
Technical field
The invention belongs to structure design and the material selection field of masonry arch bridge, related in particular to a kind of masonry arch bridge of light weight concrete construction as arch fill that use, its construction method can be applied to newly-built masonry arch bridge construction arch fill and changing of in-service masonry arch bridge reinforcing Central Plains arch fill filled out.
Background technology
Because masonry arch bridge main arch ring is shaped form, generally vehicle cannot directly travel in cambered surface, so need have the member and the filler that transmit load between runway system and main arch ring, these fillers are referred to as arch fill.Arch fill was gathered materials on the spot in order to reduce costs in the past, conventionally adopted gravel, rubble, rough sand or cobble folder clay and was tamped; When filler is not when easy to drawing materials, often use instead and build formula spandrel construction by laying bricks or stones, namely adopt dry-laid masonry or build plain concrete as arch fill.
Tradition arch fill apparent density is generally 1800kg/m
3～2450kg/m
3, heavy a lot of compared with light weight concrete construction, make the internal force of arch also large, be unfavorable for the stressed of structure.And the water permeability of these materials is not good enough, after rainwater infiltrates, expand the pressure of side wall is become to large, make side wall cracking; After water infiltrates, arch fill deadweight increases, and reduces the ability of the vehicle load of arch bridge; Infiltration flow to main arch ring, causes crack place corrosion of steel bar, weakens area of reinforcement, and after corrosion, reinforcing bar expands and causes concrete spalling, has a strong impact on supporting capacity and the useful life longevity of arch bridge.At present also there are no the relevant report that adopts light weight concrete construction as the construction method effectively of masonry arch bridge arch fill.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of masonry arch bridge of light weight concrete construction as arch fill that use is provided, can effectively improve the stressed of arch, reduce dead load internal force, improve the supporting capacity of mobile load.
To achieve these goals, the present invention has adopted following technical scheme: a kind of masonry arch bridge of light weight concrete construction as arch fill that use, comprise main arch ring, spandrel arch and arch fill layer, it is characterized in that: arch fill layer is light weight concrete construction packing layer, light weight concrete construction filler apparent density is 800kg/m
3～1750kg/m
3; Be provided with a leveling layer at arch fill layer end face; Between described main arch ring and arch fill layer, be also provided with a waterproofing course; Laterally be provided with saw kerf along bridge; Be provided with soakaway trench in its lowest position of every block of filler by saw kerf forms between two and the both sides of side wall.
Described waterproofing course adopts forever lime set or asphalt paving to form.
Described light weight concrete construction filler material is selected from one or more in sand-free coarse porous concrete concrete, flyash-haydite concrete, leca concrete, haydites of book structure concrete, float stone or slag concrete, self-combusted gangue concrete and expanded slag pearl concrete.According to the stressing conditions of main arch ring, adopt the lightweight concrete material of different apparent density in different longitudinal position, the internal force situation that can adjust main arch ring is optimum state.
Described leveling layer is that thickness is the plain concrete layer of 8cm～10cm.Leveling layer material can be selected the plain concrete of C15～C20.Leveling layer can prevent the cracking of lightweight concrete material under wheel load effect, and the planeness of adjustment light weight concrete construction is beneficial to deck paving.
Described saw kerf is no more than 3m in the longitudinal pitch in main arch ring region, is arranged on vault, the arch springing place of spandrel arch at the saw kerf in spandrel arch region.
The width of described saw kerf is 20～40mm, and adopts bitumastic backfill.
Described soakaway trench is the PVC soakaway trench of diameter 10～20mm, and side wall 10～20mm is stretched out at soakaway trench two ends.According to conventional method, gutter is set at arch bridge bridge floor, prevents that a large amount of rainwater from infiltrating arch fill.
The modulus of elasticity of described lightweight concrete material and intensity are that 1/4～1/2 of main arch ring material is the best.
When described masonry arch bridge adopts crown section Internal force control design, the arch fill layer in 1/4 to 3/4 section of masonry arch bridge span L is that to build apparent density be 760kg/m
3～1350kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction, the arch fill layer of other section is that to build apparent density be 1350kg/m
3～1950kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction.
When described masonry arch bridge adopts the Internal force control design of arch springing cross section, the arch fill layer in 1/4 to 3/4 section of masonry arch bridge span L is that to build apparent density be 1350kg/m
3～1950kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction, the arch fill layer of other section is that to build apparent density be 760kg/m
3～1350kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction.
Certain is constructed according to former masonry arch bridge filling method, arch springing Control internal force: axle power-4057kN, moment of flexure-2851kN*m, can reduce Control internal force extremely by the light weight concrete construction filler that adopts different densities: axle power-3897kN, moment of flexure-2050kN*m, meets Section resistance requirement.
Certain is constructed according to former masonry arch bridge filling method, vault Control internal force: axle power-3897kN, moment of flexure-1504kN*m, can reduce Control internal force extremely by the light weight concrete construction filler that adopts different densities: axle power-3115kN, moment of flexure-1154kN*m, meets Section resistance requirement.
Advantage of the present invention:
(1) alleviating of top arch fill deadweight, that is the reducing of the suffered non-uniform Distribution load of arch ring, the shearing of arch ring arbitrfary point, moment of flexure and axial force all reduce, so because arch fill layer is light weight concrete construction packing layer, adopt light weight concrete construction as arch fill can by arch ring internal force will reduce nearly 1 times, greatly improved the supporting capacity of bearing live load of bridge, improved safety stock.
(2) according to calculating comparison, can improve the stressed of arch:
1. all have obvious decline in amount of deflection and the moment of flexure at vault place, average amount of deflection reduces by 23%, and maximum defluxion reduces by 29%; Average moment of flexure reduces by 15%, and maximal bending moment can reduce by 27%;
2. there is obvious change in the stressed character of axle power at vault place, arch rib axle power (increment) pressurized while not considering filler bending rigidity, arch rib axle power (increment) tension while considering filler bending rigidity;
3. both differ less than 10% in moment of flexure and the axle power at arch springing place, and each arch rib at arch springing place is stressed all very even.
Brief description of the drawings
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is the schematic diagram that one embodiment of the invention draws saw kerf.
Fig. 3 is the schematic diagram that one embodiment of the invention draws soakaway trench.
Fig. 4 is the curve map of keeping supplying the impact of filler modulus of elasticity on main arch ring maximum distortion.
Reference numeral: main arch ring 1, arch fill layer 2, spandrel arch 3, leveling layer 4, saw kerf 5, soakaway trench 6, waterproofing course 7.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the present invention is further described.
Embodiment 1:
As shown in drawings, use the masonry arch bridge of light weight concrete construction as arch fill, take the design of crown section Internal force control, comprise main arch ring 1, spandrel arch 3 and arch fill layer 2, the arch fill layer 2 in 1/4 to 3/4 section of masonry arch bridge span L is that to build apparent density be 1000kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction, the arch fill layer 2 of other section is that to build apparent density be 1800kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction; Be provided with a leveling layer 4 at arch fill layer 2 end face, leveling layer 4 is that thickness is the plain concrete layer of 8cm, material selection C15 plain concrete; Between described main arch ring 1 and arch fill layer 2, be also provided with a waterproofing course 7, waterproofing course 7 adopts forever lime set or asphalt paving to form; Laterally be provided with along bridge the saw kerf 5 that width is 20mm, saw kerf 5 is no more than 3m in the longitudinal pitch in main arch ring 1 region, is arranged on vault, the arch springing place of spandrel arch 3 at 5 of the saw kerfs in spandrel arch 3 regions, and saw kerf 5 adopts bitumastic backfill; Be provided with in its lowest position of every block of filler by saw kerf 5 forms between two and the both sides of side wall the soakaway trench 6 that diameter is 10mm, side wall 10mm is stretched out at soakaway trench 6 two ends; In the zones of different of main arch ring 1; select the light weight concrete construction that apparent density is different to build according to its different stressing conditions arch fill layer 2, light weight concrete construction comprises sand-free coarse porous concrete concrete, flyash-haydite concrete, leca concrete, haydites of book structure concrete, float stone or slag concrete, self-combusted gangue concrete and expanded slag pearl concrete.Structure design and the material selection of masonry arch bridge of the present invention are reasonable, have improved the stressed of arch bridge, have improved the supporting capacity of bearing live load, have improved safety stock.
Embodiment 2:
As shown in drawings, use the masonry arch bridge of light weight concrete construction as arch fill, take the design of arch springing cross section Internal force control, comprise main arch ring 1, spandrel arch 3 and arch fill layer 2, the arch fill layer 2 in 1/4 to 3/4 section of masonry arch bridge span L is that to build apparent density be 1700kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction, the arch fill layer 2 of other section is that to build apparent density be 800kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction; Be provided with a leveling layer 4 at arch fill layer 2 end face, leveling layer 4 is that thickness is the plain concrete layer of 10cm, material selection C20 plain concrete; Between described main arch ring 1 and arch fill layer 2, be also provided with a waterproofing course 7, waterproofing course 7 adopts forever lime set or asphalt paving to form; Laterally be provided with along bridge the saw kerf 5 that width is 40mm, saw kerf 5 is no more than 3m in the longitudinal pitch in main arch ring 1 region, is arranged on vault, the arch springing place of spandrel arch 3 at 5 of the saw kerfs in spandrel arch 3 regions, and saw kerf 5 adopts bitumastic backfill; Be provided with in its lowest position of every block of filler by saw kerf 5 forms between two and the both sides of side wall the soakaway trench 6 that diameter is 20mm, side wall 20mm is stretched out at soakaway trench 6 two ends; In the zones of different of main arch ring 1; select the light weight concrete construction that apparent density is different to build according to its different stressing conditions arch fill layer 2, light weight concrete construction comprises sand-free coarse porous concrete concrete, flyash-haydite concrete, leca concrete, haydites of book structure concrete, float stone or slag concrete, self-combusted gangue concrete and expanded slag pearl concrete.Structure design and the material selection of masonry arch bridge of the present invention are reasonable, have improved the stressed of arch bridge, have improved the supporting capacity of bearing live load, have improved safety stock.
Embodiment 3:
As shown in drawings, use the masonry arch bridge of light weight concrete construction as arch fill, take vault, arch springing cross section internal force quite to design, comprise main arch ring 1, spandrel arch 3 and arch fill layer 2, arch fill layer 2 is that to build apparent density be the light weight concrete construction packing layer that the light weight concrete construction of 1250kg/m3 forms; Be provided with a leveling layer 4 at arch fill layer 2 end face, leveling layer 4 is that thickness is the plain concrete layer of 9cm, material selection C18 plain concrete; Between described main arch ring 1 and arch fill layer 2, be also provided with a waterproofing course 7, waterproofing course 7 adopts forever lime set or asphalt paving to form; Laterally be provided with along bridge the saw kerf 5 that width is 30mm, saw kerf 5 is no more than 3m in the longitudinal pitch in main arch ring 1 region, is arranged on vault, the arch springing place of spandrel arch 3 at 5 of the saw kerfs in spandrel arch 3 regions, and saw kerf 5 adopts bitumastic backfill; Be provided with in its lowest position of every block of filler by saw kerf 5 forms between two and the both sides of side wall the soakaway trench 6 that diameter is 15mm, side wall 15mm is stretched out at soakaway trench 6 two ends; In the zones of different of main arch ring 1; select the light weight concrete construction that apparent density is different to build according to its different stressing conditions arch fill layer 2, light weight concrete construction comprises sand-free coarse porous concrete concrete, flyash-haydite concrete, leca concrete, haydites of book structure concrete, float stone or slag concrete, self-combusted gangue concrete and expanded slag pearl concrete.Structure design and the material selection of masonry arch bridge of the present invention are reasonable, have improved the stressed of arch bridge, have improved the supporting capacity of bearing live load, have improved safety stock.
Claims (4)
1. one kind uses the masonry arch bridge of light weight concrete construction as arch fill, comprise main arch ring (1), spandrel arch (3) and arch fill layer (2), it is characterized in that: arch fill layer (2) is light weight concrete construction packing layer, the apparent density of light weight concrete construction packing layer is 760kg/m
3～1950kg/m
3; Be provided with a leveling layer (4) at arch fill layer (2) end face; Between described main arch ring (1) and arch fill layer (2), be also provided with a waterproofing course (7); Laterally be provided with saw kerf (5) along bridge; Be provided with soakaway trench (6) by saw kerf (5) forms between two its lowest position of every block of filler and the both sides of side wall;
Described leveling layer (4) is that thickness is the plain concrete layer of 8cm～10cm;
Described saw kerf (5) is no more than 3m in the longitudinal pitch in main arch ring (1) region, is arranged on vault, the arch springing place of spandrel arch (3) at the saw kerf (5) in spandrel arch (3) region; The width of described saw kerf (5) is 20～40mm, and adopts bitumastic backfill;
Described soakaway trench (6) is the PVC soakaway trench of diameter 10～20mm, and side wall 10～20mm is stretched out at soakaway trench (6) two ends;
When described masonry arch bridge adopts crown section Internal force control design, the arch fill layer (2) in 1/4 to 3/4 section of masonry arch bridge span L is that to build apparent density be 760kg/m
3～1350kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction, the arch fill layer (2) of other section is that to build apparent density be 1350kg/m
3～1950kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction;
When described masonry arch bridge adopts the Internal force control design of arch springing cross section, the arch fill layer (2) in 1/4 to 3/4 section of masonry arch bridge span L is that to build apparent density be 1350kg/m
3～1950kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction, the arch fill layer (2) of other section is that to build apparent density be 760kg/m
3～1350kg/m
3the light weight concrete construction packing layer that forms of light weight concrete construction.
2. use light weight concrete construction according to claim 1, as the masonry arch bridge of arch fill, is characterized in that: described waterproofing course (7) adopts forever lime set or asphalt paving to form.
3. use light weight concrete construction according to claim 1, as the masonry arch bridge of arch fill, is characterized in that: the material of described light weight concrete construction packing layer is selected from one or more in sand-free coarse porous concrete concrete, flyash-haydite concrete, leca concrete, haydites of book structure concrete, float stone or slag concrete, self-combusted gangue concrete and expanded slag pearl concrete.
4. use light weight concrete construction according to claim 1, as the masonry arch bridge of arch fill, is characterized in that: the modulus of elasticity of the material of described light weight concrete construction packing layer and intensity are 1/4～1/2 of main arch ring (1) material.
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| CN201210105040.3A CN102587268B (en) | 2012-04-12 | 2012-04-12 | Masonry arch bridge using lightweight concrete as arch filler |
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|---|---|---|---|
| CN201210105040.3A CN102587268B (en) | 2012-04-12 | 2012-04-12 | Masonry arch bridge using lightweight concrete as arch filler |
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| CN102587268B true CN102587268B (en) | 2014-07-30 |
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| CN108487087A (en) * | 2018-02-09 | 2018-09-04 | 广西交通科学研究院有限公司 | Vault ballast water volume in water tank real-time control method when arch springing is reinforced |
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| CN108487087B (en) * | 2018-02-09 | 2020-07-31 | 广西交通科学研究院有限公司 | Real-time control method for water quantity of dome top ballast water tank during arch foot reinforcement |
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