CN110904865A - Bridge reinforcing method and bridge reinforced by applying same - Google Patents
Bridge reinforcing method and bridge reinforced by applying same Download PDFInfo
- Publication number
- CN110904865A CN110904865A CN201911285516.4A CN201911285516A CN110904865A CN 110904865 A CN110904865 A CN 110904865A CN 201911285516 A CN201911285516 A CN 201911285516A CN 110904865 A CN110904865 A CN 110904865A
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- bridge
- reinforcing
- abutment
- soil
- piers
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
Abstract
The invention provides a bridge reinforcing method and a bridge reinforced by applying the method, and relates to the technical field of bridge construction, wherein the reinforcing method comprises the following steps: reinforcing a soil layer below the pile foundation, and reinforcing a soil layer below the abutment; wherein, to the reinforcement of pile foundation below soil horizon include: step 1, defining a construction area at the periphery of the pile foundation, and dividing the construction area into a plurality of sub-areas; step 2, sequentially grouting and reinforcing the sub-area to form a first support; wherein, the reinforcement to abutment below soil horizon includes: and grouting and reinforcing the soil layer below the abutment to form a second support. According to the invention, soil layers around the pile foundation are reinforced in time-sharing and regional modes, and only one regional soil layer is reinforced in the same time period, so that on one hand, the influence on the pile foundation can be reduced; on the other hand, the influence on the normal operation of the bridge is reduced, and the method can be suitable for the operating bridge.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a bridge reinforcing method and a bridge reinforced by applying the method.
Background
The bridge deck of the bridge is formed by splicing a plurality of beam bodies, and is provided with piers and abutment platforms for supporting the beam bodies.
When the bridge works normally, vehicles running on the bridge generate a horizontal acting force on the beam body, the horizontal acting force is counteracted quite depending on the fixed structures of the bridge abutment and the bridge pier, and therefore the fixation of the bridge abutment and the bridge pier needs to be further strengthened.
At present, in a method for reinforcing a bridge abutment of a bridge which is built for operation, the soil layers of the bridge abutment and the peripheral area of the bridge abutment are usually excavated at one time and are provided with supporting structures for reinforcement, so that the stability of the bridge abutment and the bridge abutment in the reinforcement process is influenced, and the normal operation of the bridge is not facilitated.
Therefore, a reinforcing method with less influence on the bridge structure is needed, so that the bridge can reinforce the abutment in a normal operation state.
Disclosure of Invention
In view of the above technical problems, the present invention aims to provide a method for reinforcing a bridge with less influence on a bridge structure.
In order to solve the technical problems, the invention adopts the following technical scheme to realize:
the invention provides a method for reinforcing a bridge, wherein the bridge comprises abutments on two sides and a plurality of piers arranged between the abutments on the two sides, a pile foundation inserted with a soil layer is arranged below each pier, and the method comprises the following steps: and reinforcing the soil layer around the pile foundation and reinforcing the soil layer below the abutment.
Wherein, consolidate the peripheral soil layer of pile foundation and include:
step 1, defining a construction area around the bridge pier, and dividing the construction area into a plurality of sub-areas.
And 2, sequentially grouting and reinforcing the sub-area to form a first support.
Wherein, the reinforcement to abutment below soil horizon includes: grouting and reinforcing the soil layer below the abutment to form a second support
Advantageously or exemplarily, in step 1, the construction area is: and the side length of the square area is 2-3 m and takes the pier as the center.
Advantageously or exemplarily, the first support comprises a jet grouting pile and the second support comprises a cured layer.
Beneficially or exemplarily, the jet grouting pile is a three-pipe high-pressure jet grouting pile configured to be 600mm @400mm in diameter and not more than 5m in depth; the solidified layer is formed by grouting and reinforcing sleeve valve pipes.
The invention provides a stable bridge reinforced by the method, which comprises abutments on two sides and a plurality of piers arranged between the abutments on the two sides, wherein pile foundations inserted into soil layers are arranged below the piers, and the soil layers below the abutments and the soil layers around the pile foundations are reinforced by the method.
Advantageously or exemplarily, the bridge further comprises a bridge deck formed by sequentially splicing a first beam body and a second beam body, the bridge abutments are arranged at two ends of the bridge deck, and the piers are arranged at the splicing positions of the first beam body and the second beam body; the pier top is equipped with the bent cap, the up end of bent cap includes: the bridge structure comprises a first step surface and a second step surface which are staggered up and down, wherein two adjacent capping beams above the bridge piers are symmetrically arranged, two ends of a first beam body are erected on the first step surface of the capping beams of the two adjacent bridge piers, and two ends of a second beam body are erected on the second step surface of the capping beams of the two adjacent bridge piers.
Advantageously or exemplarily, further comprising a plurality of stiffeners; the reinforcing member is fixedly connected between two adjacent cover beams and/or between the cover beam and the abutment through a connecting piece.
Advantageously or exemplarily, the connection is a Z-piece comprising: a first horizontal section, a second horizontal section and a vertical section; the first horizontal section of the Z-shaped member is hung on the opposite cover beam or bridge abutment, and the vertical section of the Z-shaped member is abutted against the side face of the opposite cover beam or bridge abutment; the first horizontal section is pressed on the opposite cover beam or bridge abutment by the first beam body or the second beam body; the reinforcing member is arranged on the second horizontal sections of the two Z-shaped members between the two adjacent cover beams, and/or the reinforcing member is arranged on the second horizontal sections of the two Z-shaped members between the two adjacent cover beams and the abutment, and two end surfaces of the reinforcing member can be respectively abutted against the vertical sections of the Z-shaped members opposite to the two end surfaces.
Advantageously or exemplarily, the first horizontal section is provided with a first horizontal section, and the second horizontal section is provided with a second horizontal section.
The various embodiments of the invention have the following beneficial effects:
1. the reinforcing method of the bridge is used for reinforcing the abutment and the soil layer around the pile foundation, wherein compared with the one-time excavation mode in the prior art, the reinforcing method of the soil layer around the pile foundation performs excavation construction in different areas in different time periods, only one area soil layer is reinforced in the same time period, and on one hand, the influence on the pile foundation can be reduced; on the other hand, the influence on the normal operation of the bridge is reduced, and the method can be suitable for the operating bridge. Simultaneously, the stability of bridge substructure can also be improved to the first support and the second support that form.
2. According to the stable bridge provided by the invention, the reinforcing structure is arranged, and the horizontal acting force acting on the first beam body or the second beam body is flatly spread to each pier and the abutment at two sides through the reinforcing structure, so that the horizontal acting force of the bridge floor can be effectively eliminated, the deviation of the pier and the abutment can be prevented, and the structural safety and the operation safety of the bridge can be ensured.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a plan view of a stabilized bridge and its reinforcing structure in accordance with an exemplary embodiment of the present invention;
FIG. 2 is a first schematic illustration of a stabilized bridge according to an exemplary embodiment of the present invention;
FIG. 3 is a second schematic support view of a stabilized bridge according to an exemplary embodiment of the present invention;
FIG. 4 is a top cross-sectional view of a primary support of a stabilized bridge according to an exemplary embodiment of the present invention;
fig. 5 is a diagram illustrating a step of reinforcing a soil layer under a pile foundation according to a reinforcing method for a bridge according to an exemplary embodiment of the present invention.
Reference numerals: 11-a first step surface; 12-second step surface; 13-abutment; 14-bridge pier; 15-pile foundation; 16-a capping beam; 21-a first beam; 22-a second beam; 3-a reinforcement; 4-Z-shaped piece; 41-a first horizontal segment; 42-a second horizontal segment; 43-vertical section; 5, cushion blocks; 6-first supporting; 7-second supporting; 8-the earth's surface.
Detailed Description
The invention is further described below with reference to the following examples in conjunction with the accompanying drawings.
As shown in fig. 1 to 5, a first aspect of the embodiments of the present invention provides a stable bridge, including piers 14 and a bridge deck formed by sequentially splicing a first beam 21 and a second beam 22, where the piers 14 are disposed at the splicing position of the first beam 21 and the second beam 22, and bridge abutments 13 are erected at two ends of the bridge deck; pier 14 top is equipped with bent cap 16, and the below is equipped with the pile foundation 15 that inserts the soil layer, bent cap 16 is located 14 up end of pier, bent cap 16's up end includes: the first step surface 11 and the second step surface 12 are staggered up and down, and the bent caps 16 above two adjacent piers 14 are symmetrically arranged; both ends of the first beam 21 are bridged on the first step surfaces 11 of the capping beams 16 of the two adjacent piers 14, and both ends of the second beam 22 are bridged on the second step surfaces 12 of the capping beams 16 of the two adjacent piers 14.
This embodiment is through the structure that sets up the pier, can further improve the steadiness of bridge, specifically embodies: when the first or second girder 21 or 22 receives a horizontal force, the horizontal force is converted into a vertical surface at a height difference between the first and second step surfaces 11 and 12 of the capping beam 16, that is, the horizontal force to the first or second girder 21 or 22 is converted into a lateral force to the capping beam 16, and further, the lateral force is absorbed by the fixed structure of the pier 14. Through the above process, the horizontal force applied to the first beam body 21 or the second beam body 22 can be effectively offset.
Specifically, as shown in fig. 1:
in one case, when the first beam 21 is subjected to a horizontal leftward or rightward force, the force causes the second beam 22 adjacent to the first beam 21 to be subjected to the same force, and further, the force is applied to the vertical plane at the level difference between the first step surface 11 and the second step surface 12 of the capping beam 16, so that the horizontal force is converted into a lateral force applied to the pier 14.
In another case, when the second beam 22 is subjected to a horizontal leftward or rightward force, the same is true as above.
In the above manner, the horizontal acting force applied to the bridge deck is finally converted into the acting force applied to the abutment 13 or the pier 14, however, the manner of counteracting the horizontal acting force depends on the fixing structure of the abutment 13 and the pier 14 and the splicing structure between the first beam body 21 and the second beam body 22, and if the fixing structure of the abutment 13 and the pier 14 is not firm, it is difficult to completely counteract the horizontal acting force, which may cause the displacement of the abutment 13 or the pier 14 or the collapse of the bridge caused by the separation of the first beam body 21 or the second beam body 22 from the pier 14. Therefore, embodiments of the present invention further improve the above bridge, as follows:
a firm bridge comprises a reinforcing structure, and is used for reducing the influence of horizontal acting force on the bridge deck, and the influence of the horizontal acting force on the bridge can be further reduced.
In one embodiment, a reinforcement structure comprises: a plurality of stiffeners 3; the reinforcement 3 is secured between two adjacent capping beams 16 by a connector, and in one embodiment the reinforcement 3 is also provided between adjacent capping beams 16 and the abutment 13. The reinforcing members 3 serve to convert the horizontal force into a force against the respective pier 14.
The reinforcing structure of the present embodiment is provided with the reinforcing member 3, and the horizontal acting force acting on the first beam 21 or the second beam 22 is spread to each of the piers 14 and the abutments 13 on both sides through the reinforcing structure, so that the horizontal acting force of the bridge floor can be effectively eliminated, the occurrence of deviation as the piers 14 and the abutments 13 is prevented, and the structural safety and the operational safety of the bridge are ensured.
In one embodiment, the reinforcement 3 comprises a flexible reinforcement, to which the horizontal forces can be further distributed, but in a manner that does not significantly fix the bridge pier 14 and the abutment 13. As a preferred embodiment, the reinforcement 3 comprises a rigid reinforcement, such as a steel reinforcement, which ensures a counteracting effect against horizontal forces and provides a good fixation of the pier 14 and abutment 13.
In one embodiment, the stiffener 3 is configured to: phi is 300mm, t is 10mm, each first beam body 21 or second beam body 22 is correspondingly provided with a plurality of reinforcing members 3, and the distance between the reinforcing members 3 corresponding to the same first beam body 21 or second beam body 22 is 4 m.
In one embodiment, a vertical column is set up, standing on the ground and supporting the reinforcement 3. The setting of stand can hold up reinforcement 3, and when 14 and abutment 13 mutual distance were far away, played good supporting role, avoided reinforcement 3 unstable.
In one embodiment, the connection is a Z-shaped piece 4 comprising: a first horizontal section 41, a second horizontal section 42 and a vertical section 43; the first horizontal section 41 of the Z-shaped element is suspended from the opposite cover beam 16 or bridge abutment 13, and the vertical section 43 of the Z-shaped element 4 rests on the opposite side of the cover beam 16 or bridge abutment 13; the first horizontal section 41 is pressed against the upper end face of the opposite cover beam 16 or bridge abutment 13 by the first beam body 21 or the second beam body 22; the reinforcement 3 is placed on the second horizontal sections 42 of the two Z-profiles between two adjacent cover beams 16, and/or the reinforcement 3 is placed on the second horizontal sections 42 of the two Z-profiles between two adjacent cover beams 16 and the abutment 13, and it is ensured that two end faces of the reinforcement 3 can respectively abut on the vertical sections 43 of the Z-profiles 4 opposite to the two end faces.
The present embodiment selects the Z-shaped member 4 as the connecting member, and the first beam body 21 or the second beam body 22 presses on the Z-shaped member 4, on one hand, to help to fix the reinforcing member 3; on the other hand, in the case of the first beam body 21 or the second beam body 22, a part of the horizontal force can be converted into a force acting on the reinforcement 3 by the Z-shaped member 4.
In one embodiment, the Z-profiles 4 are Z-sheet steel.
In one embodiment, the reinforcement structure further comprises a spacer 5, the spacer 5 being arranged between the first horizontal section 41 and the first beam 21 or the second beam 22.
In one embodiment, when the Z-shaped member 4 is selected as the connecting member, the spacer 5 is provided on the upper end surface of the first horizontal section 41; in a further embodiment, two spacers 5 are provided, respectively on the upper end surface of the first horizontal section 41 and the lower end surface of the first horizontal section 41. In another embodiment, the spacer 5 is provided on the lower end surface of the first horizontal section 41. In another embodiment, the spacer 5 is fixedly attached to the first horizontal section 41.
The provision of the connecting member and the spacer 5 helps stabilize the connection of the reinforcing member 3 to prevent the falling off. In one case, as shown in fig. 1 to 3, when the second beam 22 is subjected to a horizontal force to the right, on the one hand, the horizontal force applies a pressure to the pier at the right end of the second beam 22, and on the other hand, the tendency of the second beam 22 to move to the right causes the pad 5 to be subjected to a static friction force to the right, which is converted into a force to the reinforcement 3 to the right through the connection member.
That is, by the arrangement of the spacer 5 and the connecting member, a part of the horizontal force applied to the first beam 21 or the second beam 22 is directly converted into a force applied to the pier 14 and the abutment 13.
In one embodiment, a stable bridge further comprises a first support 6 disposed on a soil layer surrounding the pile foundation 15 and a second support 7 disposed on a soil layer below the abutment 14, wherein the first support 6 and the second support 7 are configured to improve stability of the abutment 13 and the pier 14.
In this embodiment, the first support 6 reinforces a soil layer around the pile foundation 15, and the second support 7 reinforces a soil layer below the abutment 13, so that the compressibility and the bearing capacity of the soil layer are improved, uneven settlement of the foundation is reduced, the abutment 13 and the pier 14 are supported, the stability of the abutment 13 and the pier 14 is further improved, and the normal operation of the bridge is ensured.
In one embodiment, the first support 6 is reinforced with MJS grouting.
In the embodiment, the MJS grouting reinforcement is a novel construction method, which has good reinforcement effect but high cost.
In another embodiment, the first struts 6 comprise jet grouting piles and the second struts 7 comprise cured layers.
In the embodiment, the first support 6 is a rotary jet grouting pile, so that the cost is reduced compared with the MJS grouting reinforcement method.
In one embodiment, the jet grouting pile is a three-pipe high-pressure jet grouting pile, is configured to be phi 600@400 and is distributed in the soil layer within 2m from the center of the pile foundation 15, and the depth of the three-pipe high-pressure jet grouting pile is not more than 5 m.
A second aspect of the embodiments of the present invention provides a method for reinforcing a bridge, where the bridge includes abutments 13 on two sides and a plurality of piers 14 arranged between the abutments 13 on the two sides, and a pile foundation 15 inserted into a soil layer is arranged below each pier 14, the method including: and reinforcing soil layers around the pile foundation 15 and reinforcing soil layers below the abutment 13.
Wherein, consolidate the peripheral soil layer of pile foundation 15 and include:
step 1, defining a construction area around the bridge pier 14, and dividing the construction area into a plurality of sub-areas; in one embodiment, in step 1, the construction area comprises: a square area with the side length of 2-3 m and taking the bridge pier 14 as the center.
And 2, sequentially grouting and reinforcing the sub-area to form a first support 6.
Wherein, to 13 below soil horizon reinforcement include: and (3) grouting and reinforcing the soil layer below the bridge abutment 13 to form a second support 7.
The bridge pier 14 is arranged on a bearing platform, and the part of the bearing platform inserted into the soil layer is a pile foundation 15.
The reinforcing method of the bridge provided by the embodiment is used for reinforcing soil layers around the bridge abutment 13 and the pile foundation 15, wherein compared with a one-time excavation mode in the prior art, the reinforcing method of the soil layers around the pile foundation 15 is used for excavation construction in time-sharing and regional areas, only one regional soil layer is reinforced in the same time period, and on one hand, the influence on the pile foundation 15 can be reduced; on the other hand, the influence on the normal operation of the bridge is reduced, and the method can be suitable for the operating bridge. Meanwhile, the formed first support 6 and the second support 7 can also improve the stability of the bridge substructure. The bridge substructure includes a bridge abutment 13, a bridge pier 14, and a pile foundation 15.
In one embodiment, the first support 6 is reinforced with MJS grouting.
In another embodiment, the first struts 6 comprise jet grouting piles and the second struts 7 comprise cured layers.
In one embodiment, the jet grouting pile is a three-pipe high-pressure jet grouting pile, is configured to be 600mm @400mm, and has a depth not exceeding 5 m; the solidified layer is formed by grouting and reinforcing sleeve valve pipes.
In one embodiment, the second support 7 is formed by grouting and reinforcing the sleeve valve pipe, and specifically comprises: and drilling a hole in the soil layer below the bridge abutment 13, inserting the sleeve valve pipe into the hole, injecting the prepared slurry into the hole through the sleeve valve pipe, after grouting is completed, pulling out the sleeve valve pipe, and sealing the hole. The drilling position is changed, and the above process is carried out for a plurality of times to form a solidified layer.
In one embodiment, the construction area is divided into four sub-areas with the horizontal line and the vertical line by dividing the center of the pier 14, and soil around the pile foundation 15 is constructed and reinforced in a time period with less traffic on the bridge.
According to the bridge reinforcing method provided by the embodiment, soil layers around the pile foundation 15 are reinforced in time-sharing and regional modes, and only one regional soil layer is reinforced in the same time period, so that the influence on the pile foundation 15 can be reduced; on the other hand, the influence on the normal operation of the bridge is reduced, and the method can be suitable for the operating bridge. And, because the regional go on, single construction cycle is shorter, can adjust the engineering time according to the operation condition flexibility of bridge.
In one embodiment, the bridge is reinforced by the reinforcing method provided by the second aspect of the present invention, the bridge comprises the pile foundation, the bridge deck and the reinforcing structure of the bridge provided by the first aspect of the present invention, and the reinforcing structure further comprises the reinforcing members 3, the connecting members and the cushion blocks 5, which are arranged to further reinforce the bridge.
In one embodiment, the method further comprises the step of arranging high-pressure jet grouting pile brace reinforcement on the ground surface 8 between two adjacent piers 14 and the ground surface 8 between the piers 14 and the abutment 13.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The bridge reinforcing method is characterized in that the bridge comprises bridge abutments on two sides and a plurality of bridge piers arranged on the two sides between the bridge abutments, pile foundations inserted into soil layers are arranged below the bridge piers, and the reinforcing method comprises the following steps: reinforcing the soil layer around the pile foundation and reinforcing the soil layer below the abutment;
wherein, consolidate the peripheral soil layer of pile foundation and include:
step 1, defining a construction area around the bridge pier, and dividing the construction area into a plurality of sub-areas;
step 2, sequentially grouting and reinforcing the sub-area to form a first support;
wherein, the reinforcement to abutment below soil horizon includes: and grouting and reinforcing the soil layer below the abutment to form a second support.
2. The deep foundation pit supporting construction method according to claim 1, wherein in the step 1, the construction areas are: and the side length of the square area is 2-3 m and takes the pier as the center.
3. A method of reinforcing a bridge according to claim 1, wherein said first bracing comprises a jet grouting pile and said second bracing comprises a cured layer.
4. The method for reinforcing a bridge according to claim 3, wherein the jet grouting pile is a three-pipe high-pressure jet grouting pile, is configured to be 600mm phi @400mm, and has a depth not exceeding 5 m; the solidified layer is formed by grouting and reinforcing sleeve valve pipes.
5. A stable bridge is characterized by comprising bridge abutments on two sides and a plurality of bridge piers arranged between the bridge abutments on the two sides, wherein pile foundations inserted into soil layers are arranged below the bridge piers, and the soil layers below the bridge abutments and the soil layers around the pile foundations are reinforced by the method of any one of claims 1 to 4.
6. A stable bridge according to claim 5, further comprising a bridge deck formed by sequentially splicing the first beam and the second beam, wherein the abutment is disposed at two ends of the bridge deck, and the pier is disposed at the spliced position of the first beam and the second beam;
the pier top is equipped with the bent cap, the up end of bent cap includes: the first step surface and the second step surface which are staggered up and down are symmetrically arranged on the bent cap beams above two adjacent piers,
and two ends of the first beam body are erected on the first step surfaces of the capping beams of the two adjacent piers, and two ends of the second beam body are erected on the second step surfaces of the capping beams of the two adjacent piers.
7. A stabilized bridge according to claim 6, further comprising a plurality of reinforcing members;
the reinforcing member is fixedly connected between two adjacent cover beams and/or between the cover beam and the abutment through a connecting piece.
8. A stabilized bridge according to claim 7, wherein said connecting elements are Z-shaped elements comprising: a first horizontal section, a second horizontal section and a vertical section;
the first horizontal section of the Z-shaped member is hung on the opposite cover beam or bridge abutment, and the vertical section of the Z-shaped member is abutted against the side face of the opposite cover beam or bridge abutment; the first horizontal section is pressed on the opposite cover beam or bridge abutment by the first beam body or the second beam body;
the reinforcing member is arranged on the second horizontal sections of the two Z-shaped members between the two adjacent cover beams, and/or the reinforcing member is arranged on the second horizontal sections of the two Z-shaped members between the two adjacent cover beams and the abutment, and two end surfaces of the reinforcing member can be respectively abutted against the vertical sections of the Z-shaped members opposite to the two end surfaces.
9. A stabilized bridge according to claim 8, further comprising a spacer block disposed between said first horizontal section and said first or second beam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911285516.4A CN110904865A (en) | 2019-12-13 | 2019-12-13 | Bridge reinforcing method and bridge reinforced by applying same |
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| CN201911285516.4A CN110904865A (en) | 2019-12-13 | 2019-12-13 | Bridge reinforcing method and bridge reinforced by applying same |
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| CN110904865A true CN110904865A (en) | 2020-03-24 |
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| CN112281894A (en) * | 2020-11-16 | 2021-01-29 | 中铁十六局集团电气化工程有限公司 | Pile foundation construction method |
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