CN112942148A - Method for reinforcing bridge by corrugated steel arch structure - Google Patents
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Abstract
一种波纹钢拱形结构加固桥梁的方法，包括:利用片石混凝土或者沙袋筑墙设置成围堰；(如有需要围堰导流)基坑开挖；拱脚部位施工处理；检查波纹钢板拱底部平整度、水平、标高；核对土建基准，确定钢板拱的位置、中心轴线、中点；由下向上顺次拼装波纹钢板；用专用密封胶或环氧树脂砂浆封填波纹钢板拱外圈搭接处；在主拱圈另一侧通过卷扬机或手拉葫芦对拼装完成的钢板拱往拱底拉拽就位；采用泵送混凝土形式对拱上空隙进行填充，有效实现了修复危旧桥梁的目的，解决了目前波纹钢板修复拱形桥梁施工过程中空间不足，难于安装、难于定位、施工效率低的问题，实现了现场不断交通，能快速施工，减少投入，降低造价，缩短工期，且可保障施工过程中道路的正常运营基本不受影响；具备良好的结构强度和防水性能且占用桥拱净空高度小。
A method for reinforcing a bridge with a corrugated steel arch structure, comprising: using rubble concrete or sandbags to build walls and setting up a cofferdam; (if necessary, cofferdam diversion) foundation pit excavation; arch foot part construction treatment; checking corrugated steel plate arch Bottom flatness, level, elevation; check the civil engineering datum to determine the position, center axis, and midpoint of the steel plate arch; assemble the corrugated steel plate in sequence from bottom to top; seal the outer ring of the corrugated steel plate arch with special sealant or epoxy resin mortar. On the other side of the main arch ring, the assembled steel plate arch is pulled to the bottom of the arch by a hoist or a chain hoist. The purpose is to solve the problems of insufficient space, difficult installation, difficult positioning, and low construction efficiency in the current construction process of corrugated steel plate repairing arch bridges, realizing continuous traffic on site, enabling rapid construction, reducing investment, reducing construction costs, and shortening the construction period. To ensure that the normal operation of the road during the construction process is basically unaffected; it has good structural strength and waterproof performance and occupies a small headroom of the bridge arch.
Description
Technical Field
The invention relates to a bridge reinforcing method, in particular to a method for reinforcing a bridge by a corrugated steel arch structure.
Background
The existing culvert is classified into a round pipe culvert, an arch culvert, a cover plate culvert and a box culvert according to different structural forms; brick culverts, stone culverts, concrete culverts and reinforced concrete culverts are classified according to the materials according to the open culverts and the dark culverts; the culvert is divided into a non-pressure type culvert, a semi-pressure type culvert and a pressure type culvert according to different hydraulic performances. The bridge is classified into a beam bridge, an arch bridge, a rigid bridge, a cable-stayed bridge and a suspension bridge according to the stress component. The beam type bridge comprises a continuous beam, a simply supported beam, a cantilever beam and a continuous beam, but the simply supported beam is mostly used within 20 meters of span. The arch bridge can be divided into masonry arch and reinforced concrete. With the rapid development of the transportation industry in China, the damage of the culvert of the existing bridge is accelerated, at present, the repair of the small-span bridge and the culvert mainly adopts construction methods of steel plate pasting, carbon fiber cloth adhering, section increasing reinforcement and crack repair, and the reinforcement methods are limited for increasing the bearing capacity and the service life of the bridge. In addition, the requirements of structural stability cannot be met by adopting bar planting reinforcement and crack repair for small bridges and culverts with serious damage on parts, the small bridges and culverts mostly only can be rebuilt or are internally lined with corrugated steel plates under the condition that structural stress cannot meet the use requirements, the small bridge culverts are built in 60 ages in the last century, and the small bridge culverts around 70 years, are half a century old today, have historical memorial significance, the rebuilding and is dismantled and loses historical memorial value, and the small bridge culverts are reinforced by concrete filling, thereby forming a complete whole with the original structure, thereby providing good supporting force, not only ensuring the safety of the original bridge structure, but also prolonging the service life, achieving the purpose of repairing and transforming, and having high memorial significance for the history of old bridges.
Compared with the traditional concrete material, the corrugated steel plate has the advantages of light weight, high strength, good stress performance, strong adaptability, short construction period, long service life and the like, and is increasingly widely applied to the construction of domestic and foreign roads, particularly mountainous roads and unfavorable geological conditions.
For part of severely damaged road and bridge culverts, if the road and bridge culverts are rebuilt, the time consumption is long, the cost is high, the normal operation of traffic is affected, and in addition, some historical original appearances cannot be reserved;
disclosure of Invention
The invention aims to solve the problems that if a seriously damaged road and bridge culvert in the prior art is rebuilt, the time consumption is long, the manufacturing cost is high, the protection significance on the history of the bridge is lost, and the normal operation of traffic is influenced.
The technical scheme adopted by the invention is as follows: a method for reinforcing a bridge by a corrugated steel arch structure comprises the following steps:
the method comprises the following steps: and (5) coffering. The cofferdam and the diversion wall are formed by using stone slab concrete or sand bag for building the wall, so that the problem that construction cannot be carried out due to over-emergency water or water flow is solved. Determining a cofferdam foundation according to the water level and the depth of water, building a weir after tamping the cofferdam foundation, wherein the built weir needs to ensure the difference of water pressure inside and outside a weir wall and ensure the firmness of the cofferdam;
step two: excavating a foundation pit, wherein the joint of the steel corrugated plate and the arch springing needs to be excavated according to the section of a foundation trench specified by design; reserving a soil layer with a certain thickness according to the soil layer condition, so that the soil layer reaches the designed elevation of the substrate after being tamped; the foundation pit should avoid the overexcavation, such as the overexcavation, should remove the loose part, when the foundation soil is a bad soil layer such as silt, should adopt the good gravel of gradation, natural sand, gravel soil, but need to remove the hard thing such as more than 100mm of stone, the bedding course compacts according to the compactness that the design requires;
step three: treating the arch springing part; because the main stress point of newly-increased shaped steel rack and wave form steel sheet is the hunch foot position, strengthen the processing to the hunch foot position: concrete arch foot foundations are poured over the original arch bottom concrete slab along the bridge width direction in full length, and meanwhile, steel bars are implanted between the new foundation and the old foundation, so that the new foundation and the old foundation become a finished stress, and the stress condition of the foundations is increased. In order to facilitate the installation of a steel corrugated plate and the improvement of the connection firmness of the corrugated steel plate and a foundation and the stress point of an arch, a rectangular groove with the width of 0.3 m and the height of 0.2 m is reserved at the arch angle part and the original structure surface, and a steel member is embedded at the bottom of the groove to connect the steel corrugated arch;
step four: checking the flatness, the level and the elevation of the bottom of the corrugated steel plate arch; checking a civil engineering standard, and determining the position, the central axis and the midpoint of the steel plate arch;
step five: sequentially assembling corrugated steel plates from bottom to top; axial lapping is adopted between the steel plates, the upper plate of the lapping part covers the lower plate, the circumferential connection adopts a step shape, namely, the connection lap joint of the upper two plates is staggered with the lap joint of the lower two plates, after the connecting holes are aligned, a bolt coated with a lubricant is used, a washer is sleeved on the bolt, a hole site is inserted from inside to outside, a nut is pre-tightened by a socket wrench, and corrugated plates at two sides are symmetrically installed;
step six: when a plurality of corrugated plates are assembled in the circumferential direction, the section shape is measured once, the corrugated plates are assembled continuously after reaching the standard, and the corrugated plates are adjusted in time when not reaching the standard; when the annular ring is assembled in the circumferential direction and closed, the section shape is measured, a positioning pull rod is adopted for fixing, a pre-tightening bolt is adjusted, and a first corrugated plate at the top is assembled;
step seven: after the corrugated steel plates are completely assembled, fastening all bolts according to the pretightening force torque by using a fixed-torque electric wrench, and marking the fastened bottom bolts by using red paint in sequence without omission; all bolts should be tightened before backfilling to ensure that the overlapping portions of the corrugations are tightly nested together;
step eight: after the lap joint of the outer ring of the corrugated steel plate arch meets the requirement of pre-tightening force torque, the lap joint of the outer ring of the corrugated steel plate arch is sealed and filled with special sealant to prevent water seepage at the joint of the corrugated steel plates;
step nine: after the steel corrugated main arch ring is assembled at the lower part of the bridge, an arch ring is assembled outside the steel corrugated main arch ring, the assembled steel plate arch is pulled to the arch bottom to be in place at the other side of the main arch ring through a winch or a chain block, and the assembly of the whole steel corrugated plate is sequentially completed; if one bridge has several spans, the bridge is assembled synchronously or sequentially from front to back, but the pouring concrete must be poured synchronously for several spans;
step ten: and (6) pouring concrete. Filling gaps between the steel corrugated plates and the original plates in a pump concrete mode or a bridge deck opening mode, adopting a segmented and vault two-side synchronous pouring mode in the pouring process, and performing segmented pouring on gaps on the vaults by adopting C20 fine aggregate concrete or micro-expansive concrete; the method of symmetrical pouring must be adopted when pouring, adopt the mode of knocking to trail in time the filling effect at the in-process of pouring, mend the not closely knit district section of filling effect, utilize the mode of electromagnetic shaker vibrations steel sheet to fill concrete vibrations, guarantee the closely knit degree of pouring of concrete, carry out the maintenance after pouring.
Furthermore, the soil foundation pit dug to the elevation in the second step cannot be exposed, disturbed or soaked for a long time, and the size, the elevation and the bearing capacity of the foundation pit should be checked in time. And after the requirements are met, performing foundation construction immediately.
Further, in the sixth step, in order to ensure that the required value of the bolt torque is reached, 2% of bolts on the longitudinal joint of the structure are randomly extracted before backfilling, a fixed-torque wrench is used for carrying out a sampling test, and if any test value exceeds a given torque range, 5% of all bolts on the longitudinal joint and the circumferential joint are sampled. If more than 90% of the above tests meet the requirements, the installation is considered to be qualified. Otherwise, the design should be re-checked to determine if the resulting torque value meets the requirements.
Furthermore, the soil foundation pit dug to the elevation cannot be exposed, disturbed or soaked for a long time, and the size, the elevation and the bearing capacity of the foundation pit should be checked in time; and after the requirements are met, performing foundation construction immediately.
Furthermore, a section steel reinforcing structure can be arranged between the corrugated steel plate arch and the inner side of the bridge according to engineering requirements, and the structure mainly plays a supporting role and reinforces supporting force.
Furthermore, the section steel reinforcing structure is I-shaped steel arch rings which are arranged at intervals of 20-40 cm along the width direction of the bridge, connecting steel bars are fixedly arranged between every two arch rings, and the connecting steel bars transversely connect every two I-shaped steel arch rings to form a whole.
Furthermore, the arch springing foundation is of a groove-shaped concrete structure, an embedded steel plate is arranged inside the groove shape, and the embedded steel plate can be provided with guide steel bars.
Furthermore, in the step ten, before the concrete is poured on the arch, temporary supporting treatment needs to be carried out on the corrugated steel plate arch to prevent the corrugated steel plate arch from being damaged in the concrete pumping process.
Furthermore, a waterproof layer can be arranged between the corrugated steel plate arch and the inner side of the bridge.
The invention has the advantages and characteristics that:
(1) the method effectively realizes the repair of the arched bridge to be repaired, solves the problems of complicated working procedures and low construction efficiency in the construction process of repairing the arched bridge by the corrugated steel plate at present, realizes the on-site rapid construction, reduces the labor and equipment investment, reduces the manufacturing cost, and can ensure the normal operation of roads in the construction process;
(2) possesses good structural strength and waterproof performance and occupies that the bridge arch headroom height is little.
Drawings
FIG. 1 is a schematic view of the overall mounting structure of the preferred embodiment of the present invention;
FIG. 2 is a schematic structural view of a column of a sectional view of a cofferdam construction according to a preferred embodiment of the present invention;
FIG. 3 is a circumferential connection view of the inner and outer surfaces of the segmented steel corrugated pipe according to the preferred embodiment of the present invention;
FIG. 4 is a structural view of a steel reinforcing structure according to a preferred embodiment of the present invention;
FIG. 5 is a schematic view of the layout of the anti-friction guiding bars according to the preferred embodiment of the present invention;
FIG. 6 is a schematic view of the anti-friction guide bars according to the preferred embodiment of the present invention;
FIG. 7 is a schematic view of an overall installation structure (cylindrical corrugated steel plate arch) according to another preferred embodiment of the present invention;
FIG. 8 is a schematic view of an overall installation structure (arc door type corrugated steel plate arch) according to another preferred embodiment of the present invention;
FIG. 9 is a schematic structural view of a deck arch for simple bridge reinforcement according to a preferred embodiment of the present invention;
the reference numbers in the figures denote: 1-corrugated steel plate arch, 2-arch springing foundation, 21-embedded steel plate, 22-guide steel bar and 3-section steel reinforcing structure.
Detailed Description
The invention is further illustrated with reference to the accompanying drawings:
example 1:
referring to fig. 1 and 2, a method for reinforcing a bridge with a corrugated steel arch structure includes the following steps:
the method comprises the following steps: and (5) coffering. The cofferdam and the diversion wall are formed by using stone slab concrete or sand bag for building the wall, so that the problem that construction cannot be carried out due to over-emergency water or water flow is solved. Determining a cofferdam foundation according to the water level and the depth of water, building a weir after tamping the cofferdam foundation, wherein the built weir needs to ensure the difference of water pressure inside and outside a weir wall and ensure the firmness of the cofferdam;
step two: excavating a foundation pit, wherein the joint of the steel corrugated plate and the arch springing needs to be excavated according to the section of a foundation trench specified by design; reserving a soil layer with a certain thickness according to the soil layer condition to ensure that the soil layer reaches the designed elevation of the substrate after being tamped; the foundation pit should avoid the overexcavation, such as the overexcavation, should remove the loose part, when the foundation soil is a bad soil layer such as silt, should adopt the good gravel of gradation, natural sand, gravel soil, but need to remove the hard thing such as more than 100 mm's stone, the compactness of the bedding cushion should not be less than 95%; the soil foundation pit dug to the elevation cannot be exposed, disturbed or soaked for a long time, and the size, the elevation and the bearing capacity of the foundation pit should be checked in time. And after the requirements are met, performing foundation construction immediately.
Step three: treating the arch springing part; because the main stress point of newly-increased shaped steel rack and wave form steel sheet is the hunch foot position, strengthen the processing to the hunch foot position: the method comprises the following steps of pouring a wide C30 reinforced concrete arch foot foundation over an original arch bottom concrete slab along the full length of the bridge width direction, improving the stress form of a corrugated steel slab arch by implanting short steel bars between a new foundation and an old foundation, reserving a rectangular groove with the width of 0.3 m and the height of 0.2 m at the position of an arch corner rubber, and embedding a steel member at the bottom of the groove to connect the steel corrugated arch;
step four: checking the flatness, the level and the elevation of the bottom of the corrugated steel plate arch; checking a civil engineering standard, and determining the position, the central axis and the midpoint of the steel plate arch;
step five: sequentially assembling corrugated steel plates from bottom to top; the axial lapping width is 120mm, the lapping part is covered with the lower plate by the upper plate, the circumferential connection adopts a step shape, namely, the connecting lap joint of the upper two plates is staggered with the lap joint of the lower two plates, after the connecting holes are aligned, a bolt coated with a lubricant is used, a washer (a convex pad used when meeting valley and a concave pad used when meeting peak but not reversed) is sleeved on the bolt, a hole site is inserted from inside to outside, a nut is pre-tightened by a socket wrench, and the corrugated plates at two sides are symmetrically installed;
step six: when a plurality of corrugated plates are circumferentially assembled, the section shape is measured once, the corrugated plates are assembled continuously after reaching the standard, and the corrugated plates are adjusted in time when not reaching the standard; when the annular ring is assembled in the circumferential direction and closed, the section shape is measured, a positioning pull rod is adopted for fixing, a pre-tightening bolt is adjusted, and a first corrugated plate at the top is assembled; in order to ensure that the required value of bolt torque is achieved, 2% of bolts on a longitudinal joint on a structure are randomly extracted before backfilling, a fixed-torque wrench is used for carrying out a sampling test, and if any test value exceeds a given torque range, 5% of all the bolts on the longitudinal joint and the circumferential joint are sampled. If more than 90% of the above tests meet the requirements, the installation is considered to be qualified. Otherwise, the design should be re-checked to determine if the resulting torque value meets the requirements.
Step seven: after the corrugated steel plates are completely assembled, fastening all bolts according to the pretightening force torque of 340 N.m +/-70 N.m by using a fixed-torque electric wrench, and marking the fastened bottom bolts by using red paint in sequence without omission; all bolts (including longitudinal and circumferential seams) should be tightened prior to backfilling to ensure that the overlapping portions of the corrugations nest closely together;
step eight: after the lap joint of the outer ring of the corrugated steel plate arch meets the requirement of pretightening force torque, special sealant or epoxy resin mortar can be used for sealing and filling to prevent water seepage at the joint of the corrugated steel plate arch;
step nine: after an arch ring assembly is completed outside a main arch ring of the arch bridge, pulling the assembled steel plate arch to the arch bottom to be in place through a winch or a chain block on the other side of the main arch ring; sequentially completing the assembly of the whole steel corrugated plate; if one bridge has several spans, the bridge is assembled synchronously or sequentially from front to back, but the pouring concrete must be poured synchronously for several spans;
step ten: pouring concrete; filling gaps on the arch in a pump concrete mode, adopting a sectional pouring treatment mode in the pouring process, and performing sectional pouring on the gaps on the arch by adopting C20 fine aggregate concrete, wherein each section is 5-8 meters; meanwhile, a symmetrical pouring method is adopted during pouring, the filling effect is tracked in time in a knocking mode in the pouring process, and the section with an uncompacted filling effect is filled; and (5) ensuring the pouring compactness of the concrete, and curing after pouring. The corrugated steel plate arch needs to be subjected to temporary supporting treatment before concrete is poured on the arch, so that the corrugated steel plate arch is prevented from being damaged in the concrete pumping process.
The soil foundation pit dug to the elevation cannot be exposed, disturbed or soaked for a long time, and the size, the elevation and the bearing capacity of the foundation pit should be checked in time. And after the requirements are met, performing foundation construction immediately.
Referring to fig. 3 and 4, a section steel reinforcing structure is further disposed between the corrugated steel plate arch and the inner side of the bridge. The structural steel reinforcing structure is I-shaped steel arch rings which are arranged at intervals of 20-40 cm along the width direction of the bridge, short reinforcing steel bars are fixedly arranged between every two arch rings, and the short reinforcing steel bars transversely link the I-shaped steel arch rings.
Referring to fig. 5 and 6, the arch foot foundation is a groove-type concrete structure, and an embedded steel plate is arranged in the groove-type concrete structure and provided with a guide steel bar.
And a waterproof rubber layer is arranged between the arch and the inner side of the bridge in consideration of the possibility of water seepage of the inner side of the bridge in the rainy period.
Example 2:
referring to fig. 7-9, the technical solution of the present invention can be implemented in other forms, such as a cylindrical corrugated steel in fig. 7 for reinforcing a bridge, and an arc-shaped door corrugated steel in fig. 8 for reinforcing a bridge; it can also be used for reinforcing a simple bridge as in fig. 9.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only for the purpose of illustrating the structural relationship and principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
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| CN114293485A (en) * | 2022-01-20 | 2022-04-08 | 四川省公路规划勘察设计研究院有限公司 | An arch bridge reinforcement structure without interrupting traffic and its construction method |
| CN114293485B (en) * | 2022-01-20 | 2022-11-08 | 四川省公路规划勘察设计研究院有限公司 | An arch bridge reinforcement structure without interrupting traffic and its construction method |
| CN115522486A (en) * | 2022-10-14 | 2022-12-27 | 山东高速工程建设集团有限公司 | Arch corrugated steel plate installation and positioning fine-tuning device |
| CN116676889A (en) * | 2023-04-24 | 2023-09-01 | 四川省公路规划勘察设计研究院有限公司 | Corrugated steel reinforcement system and method for existing bridges |
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