CN208486164U - A kind of arch bridge skewback construction improving basic bearing capacity - Google Patents
A kind of arch bridge skewback construction improving basic bearing capacity Download PDFInfo
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- CN208486164U CN208486164U CN201821008182.7U CN201821008182U CN208486164U CN 208486164 U CN208486164 U CN 208486164U CN 201821008182 U CN201821008182 U CN 201821008182U CN 208486164 U CN208486164 U CN 208486164U
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Abstract
The utility model discloses a kind of arch bridge skewback constructions for improving basic bearing capacity, including skewback ontology, and the bottom of skewback ontology is provided with several pile foundations, covers in basement rock under pile foundation insertion skewback ontology.The purpose of this utility model is that: for the problem that arch bridge requires the geological conditions at bridge location very high, to significantly limit a wide range of popularization and application and development of the bridge type, a kind of arch bridge skewback improving basic bearing capacity is provided and is constructed.Under same geological conditions, compared to traditional arch bridge skewback, which is capable of providing bigger bearing capacity.
Description
Technical field
The utility model belongs to bridge construction field of engineering technology.In particular it relates to a kind of raising arch bridge skewback basis
The construction of bearing capacity.
Background technique
In recent years, with the mountain areas such as southwest China high speed railway construction rapid development, railroad bridge design in,
More and more encounter the high mountain gorge landform that need to be crossed over using long-span arch bridge.In these areas, arch bridge has more
Good terrain adaptability, while can provide the bigger rigidity of structure, driving stationarity and comfort are also more excellent, reasonable stress and outside
Shape is graceful, is more able to satisfy requirement of the high-speed railway to bridge structure.Therefore, arch bridge is that across the deep valley landform in railways in Southwestern area is a kind of
Extraordinary solution.And had the above advantages just because of arch bridge, the bridge type is also very fast in the development of China.Example
Such as, the first in the world of main span 420m has just been built up in 1997 greatly across concrete arch-type bridge-Wanxian Yangtze river long span arch bridge, has additionally been built up
The a collection of long-span arch bridges such as the Guizhou river boundary river bridge of the Shuibai Railway Beipanjiang Bridge of main span 236m and main span 330m.
But this bridge type also has the applicable limitation of its own.Traditional arch bridge skewback generally uses open cut foundation, and
Arch bridge is a kind of thrust structure, is required the geological conditions at bridge location very high.For LONG-SPAN RAILWAY arch bridge,
The Basic bearing ability that basement rock is covered under general must reach 1.0MPa or more, just be able to satisfy requirement for bearing capacity.Meanwhile for Large Span Structure of Arch
For bridge, due to the requirement of foundation bearing capacity to be met, the size on skewback basis is usually very big, correspondingly the body of skewback concrete
Amount is also very big, and the generation in the later period crack of large volume concrete structural is difficult to control and a very big security risk.
Disadvantages mentioned above significantly limits a wide range of popularization and application and development of the bridge type.
Utility model content
The purpose of this utility model is that: it is very high to the geological conditions requirement at bridge location for arch bridge, thus greatly
The problem of limiting a wide range of popularization and application and development of the bridge type, provides a kind of arch bridge skewback structure for improving basic bearing capacity
It makes.Under same geological conditions, compared to traditional arch bridge skewback, which is capable of providing bigger bearing capacity.
To achieve the goals above, the technical solution adopted in the utility model are as follows:
A kind of arch bridge skewback construction improving basic bearing capacity, including skewback ontology, are arranged in the bottom of skewback ontology
There are several pile foundations, is covered in basement rock under pile foundation insertion skewback ontology.It constructs, directly acts on down compared to traditional skewback
Basement rock is covered, the bearing capacity requirement that basement rock is covered under is high.This programme, which squeezes into down pile foundation, covers basement rock, and skewback ontology is arranged
In pile foundation, the bearing capacity for covering basement rock is substantially increased down.
Preferably, the bottom of skewback ontology is provided with and the orthogonal inclined surface of the tangent line of arch springing.Arch springing pair
Skewback ontology has thrust, and the direction of thrust is the tangent line perpendicular to arch springing, and the inclination vertical with arch springing tangent line is arranged in this programme
Face, makes stress more evenly, and the pressure that basement rock is covered under reduces, so as to improve the bearing capacity of basement rock.
Preferably, it is provided with ladder on the inclined surface of skewback ontology, and ladder is made of vertical plane and horizontal plane.
The stress of inclined surface is decomposed into vertical stress and horizontal stress by the horizontal plane and vertical plane of cascaded surface, can be further decreased down
The pressure of basement rock is covered, so as to further increase the bearing capacity of basement rock.
Preferably, pile foundation is arranged on the horizontal plane of skewback ontology cascaded surface, and pile foundation is vertically arranged.Pile foundation is perpendicular
It directly squeezes into down and covers basement rock, be conducive to the bearing capacity for improving basement rock, and difficulty of construction is low.
Preferably, border pier is provided on skewback ontology；In the horizontal plane of skewback ontology cascaded surface, there is a water
The area of plane is greater than remaining horizontal plane, and the number that pile foundation is arranged on the greater level face is more than remaining horizontal plane.Due to handing over
Boundary's pier is arranged on skewback ontology, and the vertical stress for being subject to skewback ontology is bigger compared to horizontal stress.This programme setting
Bigger horizontal plane, and more pile foundations are set on the horizontal plane, it can make the uniform force on skewback basis more preferable.
Preferably, the length of each pile foundation is identical.The depth for making pile foundation squeeze into stratum is consistent, to make skewback sheet
The support stress of body is more evenly.
Preferably, skewback ontology is formed by several pieces of mutually independent structures to form.The skewback concrete scale of construction compared with
Greatly, belong to mass concrete construction.It is by several pieces by skewback body design to avoid the heat of hydration from leading to skewback concrete cracking
Mutually independent block structure is spliced, and arch springing and border pier are placed on block.This design method, greatly reduces
The size of single concrete structure, effectively reduces the influence of the heat of hydration, improves large span Deck Arch Bridges skewback substantially
The problem of product Concrete Crack Control.
Preferably, skewback ontology includes the left bearing block and right load-bearing positioned at bottom and for contacting with basement rock
Block, and positioned at top and it is used to support the supporting block of arch springing and border pier；Be provided between left bearing block and right bearing block every
Plate directly contacts between supporting block and left bearing block and right bearing block.This programme provides a kind of structurally reasonable split type splicing
Mode can effectively reduce the aquation heat affecting of big scale of construction concrete.
Preferably, the bottom surface of supporting block is by first plane vertical with arch springing, and vertical with border pier
Two planes composition；The bottom surface of the top surface and supporting block of left bearing block and right bearing block is mutually matched.It is used to support arch springing and boundary
The plane of pier and its structure vertical supported, keep structure stress more reasonable, enabling capabilities are stronger.
Preferably, the top left side of left bearing block is provided with left confinement block, the top right side setting of right bearing block
There is right confinement block；Left confinement block and right confinement block are located at the arranged on left and right sides of supporting block.Left confinement block is used for right confinement block
The supporting block sliding lateral along left and right is limited, keeps the structural stability of skewback ontology more preferable.
In conclusion by adopting the above-described technical solution, compared with the prior art, the beneficial effects of the utility model
Be: the utility model provides a kind of economically and reasonably large span Deck Arch Bridges skewback foundation structure, can effectively solve big
The problem of span Deck Arch Bridges geological conditions bad adaptability, so that the no longer stringent pact by geological conditions of concrete arch-type bridge
Beam has greatly widened the scope of application of the bridge type, while can also improve large span Deck Arch Bridges skewback mass concrete
The problem of Crack Control.The application of the skewback construction of the utility model, has broken the technical bottleneck of conventional construction method, is bigger
The construction of the Deck Arch Bridges of span provides new idea and method, is a kind of large span deck type for being worth promoting on a large scale
Arch bridge skewback foundation structure.
Detailed description of the invention
Fig. 1 is the schematic perspective view one of embodiment.
Fig. 2 is the schematic perspective view two of embodiment.
Fig. 3 is the side structure schematic view of embodiment.
Fig. 4 is the exploded perspective structural schematic diagram one of embodiment (not including partition).
Fig. 5 is the exploded perspective structural schematic diagram two of embodiment (not including partition).
Fig. 6 is the schematic perspective view one of right bearing block and pile foundation.
Fig. 7 is the schematic perspective view two of right bearing block and pile foundation.
Fig. 8 is the side structure schematic view of right bearing block and pile foundation.
Fig. 9 is the schematic perspective view one of supporting block, arch springing and border pier.
Figure 10 is the schematic perspective view two of supporting block, arch springing and border pier.
Figure 11 is the side structure schematic view of supporting block, arch springing and border pier.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.
Present embodiment discloses a kind of arch bridge skewback constructions for improving basic bearing capacity, as shown in figures 1-8, including skewback
Ontology 1 is provided with several pile foundations 2 in the bottom of skewback ontology 1, and pile foundation 2, which is embedded under skewback ontology 1, to be covered in basement rock.
Specifically, as shown in figs. 1-11, the bottom of skewback ontology 1 is provided with and the orthogonal inclination of the tangent line of arch springing 3
Face.Ladder is provided on the inclined surface of skewback ontology 1, and ladder is made of vertical plane and horizontal plane.Pile foundation 2 is arranged in skewback sheet
On the horizontal plane of 1 cascaded surface of body, and pile foundation 2 is vertically arranged.Border pier 4 is provided on skewback ontology 1；1 cascaded surface of skewback ontology
Horizontal plane in, have a horizontal plane area be greater than remaining horizontal plane, and on the greater level face be arranged pile foundation 2 number it is more
In remaining horizontal plane.The length of each pile foundation 2 is identical.
Specifically, as shown in figs. 1-11, skewback ontology 1 is formed by several pieces of mutually independent structures to form.Skewback ontology 1
Left bearing block 11 and right bearing block 12 including being located at bottom and for being contacted with basement rock, and positioned at top and it is used to support arch
The supporting block 13 of foot 3 and border pier 4；Partition, supporting block 13 and left load-bearing are provided between left bearing block 11 and right bearing block 12
It is directly contacted between block 11 and right bearing block 12.The bottom surface of supporting block 13 is by first plane 131, Yi Jiyu vertical with arch springing 3
Vertical the second plane 132 composition of border pier 4；The top surface of left bearing block 11 and right bearing block 12 and the bottom surface of supporting block 13 are mutual
Matching.The top left side of left bearing block 11 is provided with left confinement block 111, and the top right side of right bearing block 12 is provided with right confinement block
121；Left confinement block 111 is located at the arranged on left and right sides of supporting block 13 with right confinement block 121.
The present embodiment is illustrated by taking certain 416m deck type reinforced concrete arch bridge as an example below: bridge main span 416m,
Rise 99m, ratio of rise to span 1/4.2, arch ring is using three Room section of single case.On the basis of summarizing traditional skewback design feature, needle
Traditional skewback structure is optimized in its disadvantage, creatively uses " sectional type open cut+stake in actual items construction
Base combines skewback basis ".The application on skewback basis, has broken the technical bottleneck of conventional construction method, has greatly widened big
The application range of span Deck Arch Bridges, while also new thinking and side are provided for the construction of the Deck Arch Bridges of more large span
Method.
Present solution provides a kind of economically and reasonably large span Deck Arch Bridges skewback foundation structure (sectional type open cuts+stake
Base combines skewback basis), the problem of capable of efficiently solving large span Deck Arch Bridges geological conditions bad adaptability, greatly improves
The problem of scope of application of arch bridge bridge type can also improve large span Deck Arch Bridges skewback control of concrete cracks simultaneously.
It is marl and limestone that basement rock is covered under the bridge two sides skewback, and corrosion fissure is locally present.Stepped open cut foundation
Bottom surface can not be placed in the complete basement rock of weak weathered layer, and line alignment and geological conditions determine that more preferably bridge location selects without other
It selects.In order to solve the problems, such as to build 400m grades of large span type concrete arch bridges in the case where geological conditions is relatively poor,
Bridge novelty uses " sectional type open cut+pile foundation combination skewback basis ".
The basis top is staged open cut foundation, the laterally wide 48m in left and right, longitudinal width 32m.Foundation bottom is placed in W3 layers
In (Basic bearing ability 0.6MPa), the drilled pile of 36 2.2m diameters is added in open cut foundation lower part, the stake bottom of pile foundation is placed in weak
In weathered layer W2.According to the computational theory of composite foundation, calculating is allocated by the area and rigidity of pile foundation and open cut foundation,
It is finally reached and reduces open cut foundation and vertically and horizontally size and meet the target of basic stress.
In addition, the skewback concrete scale of construction is larger, belong to mass concrete construction.To avoid the heat of hydration from leading to skewback concrete
Skewback top step type open cut foundation part has been divided into three concret blocks when design and constituted by cracking, arch springing and border pier
It is placed in the supporting block of top, using C40 concrete, two bearing blocks of lower layer use C30 concrete.This method, larger amplitude
The size for reducing single concrete structure of degree, effectively reduces the influence of the heat of hydration.
To sum up, the use of " sectional type open cut+pile foundation combination skewback basis " is so that type concrete arch bridge is no longer stringent
The constraint by geological conditions, widened the scope of application of the bridge type significantly, while also very good solution skewback large volume
The problem of Concrete Crack Control is a kind of large span Deck Arch Bridges skewback foundation structure for being worth promoting on a large scale.Greatly across
Degree Deck Arch Bridges solve large span Deck Arch Bridges geology after using " sectional type open cut+pile foundation combination skewback basis " structure
The problem of condition bad adaptability, greatly improves the scope of application of the bridge type, simultaneously because by top step type open cut foundation
Three parts are divided into, the size for reducing single concrete structure by a relatively large margin effectively reduces the influence of the heat of hydration, improves
The problem of large span Deck Arch Bridges skewback control of concrete cracks is a kind of deck type for being worth promoting on a large scale
Arch bridge skewback foundation structure.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (10)
1. a kind of arch bridge skewback construction for improving basic bearing capacity, including skewback ontology (1), it is characterised in that: in skewback sheet
The bottom of body (1) is provided with several pile foundations (2), covers in basement rock under pile foundation (2) insertion skewback ontology (1).
2. the arch bridge skewback construction according to claim 1 for improving basic bearing capacity, it is characterised in that: skewback ontology
(1) bottom is provided with and the orthogonal inclined surface of tangent line of arch springing (3).
3. the arch bridge skewback construction according to claim 2 for improving basic bearing capacity, it is characterised in that: skewback ontology
(1) ladder is provided on inclined surface, and ladder is made of vertical plane and horizontal plane.
4. the arch bridge skewback construction according to claim 3 for improving basic bearing capacity, it is characterised in that: pile foundation (2) is set
It sets on the horizontal plane of skewback ontology (1) cascaded surface, and pile foundation (2) is vertically arranged.
5. the arch bridge skewback construction according to claim 4 for improving basic bearing capacity, it is characterised in that: skewback ontology
(1) border pier (4) are provided on；In the horizontal plane of skewback ontology (1) cascaded surface, there is the area of a horizontal plane to be greater than remaining water
Plane, and the number that pile foundation (2) are arranged on the greater level face is more than remaining horizontal plane.
6. the arch bridge skewback construction according to claim 4 for improving basic bearing capacity, it is characterised in that: each pile foundation
(2) length is identical.
7. the arch bridge skewback construction according to claim 1 for improving basic bearing capacity, it is characterised in that: skewback ontology
(1) it is formed by several pieces of mutually independent structures to form.
8. the arch bridge skewback construction according to claim 7 for improving basic bearing capacity, it is characterised in that: skewback ontology
It (1) include being located at bottom and left bearing block (11) and right bearing block (12) for contacting with basement rock, and be used in combination positioned at top
Supporting block (13) in support arch springing (3) and border pier (4)；Be provided between left bearing block (11) and right bearing block (12) every
Plate directly contacts between supporting block (13) and left bearing block (11) and right bearing block (12).
9. the arch bridge skewback construction according to claim 8 for improving basic bearing capacity, it is characterised in that: supporting block (13)
Bottom surface by first plane (131) vertical with arch springing (3), and second plane (132) composition vertical with border pier (4)；
The top surface of left bearing block (11) and right bearing block (12) and the bottom surface of supporting block (13) are mutually matched.
10. the arch bridge skewback construction according to claim 8 for improving basic bearing capacity, it is characterised in that: left bearing block
(11) top left side is provided with left confinement block (111), and the top right side of right bearing block (12) is provided with right confinement block (121)；
Left confinement block (111) and right confinement block (121) are located at the arranged on left and right sides of supporting block (13).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821008182.7U CN208486164U (en) | 2018-06-27 | 2018-06-27 | A kind of arch bridge skewback construction improving basic bearing capacity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108625274A (en) * | 2018-06-27 | 2018-10-09 | 中铁二院工程集团有限责任公司 | A kind of arch bridge skewback construction improving basic bearing capacity |
| CN113897880A (en) * | 2021-11-22 | 2022-01-07 | 贵州桥梁建设集团有限责任公司 | Method for cast-in-place construction of short-span suspended assembly arch center of large-span concrete arch bridge |
-
2018
- 2018-06-27 CN CN201821008182.7U patent/CN208486164U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108625274A (en) * | 2018-06-27 | 2018-10-09 | 中铁二院工程集团有限责任公司 | A kind of arch bridge skewback construction improving basic bearing capacity |
| CN113897880A (en) * | 2021-11-22 | 2022-01-07 | 贵州桥梁建设集团有限责任公司 | Method for cast-in-place construction of short-span suspended assembly arch center of large-span concrete arch bridge |
| CN113897880B (en) * | 2021-11-22 | 2023-09-12 | 贵州桥梁建设集团有限责任公司 | Method for cast-in-situ construction of short-span suspension spliced arch bridge of large-span concrete arch bridge |
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