CN117005332A - Reinforcing structure of thin-wall pier of continuous steel bridge and construction method - Google Patents
Reinforcing structure of thin-wall pier of continuous steel bridge and construction method Download PDFInfo
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- CN117005332A CN117005332A CN202311038260.3A CN202311038260A CN117005332A CN 117005332 A CN117005332 A CN 117005332A CN 202311038260 A CN202311038260 A CN 202311038260A CN 117005332 A CN117005332 A CN 117005332A
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- wall pier
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 137
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000010276 construction Methods 0.000 title claims abstract description 20
- 230000002787 reinforcement Effects 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000004567 concrete Substances 0.000 claims description 23
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 abstract description 5
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000011513 prestressed concrete Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
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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
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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
- E01D19/00—Structural or constructional details of 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
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
Abstract
The invention belongs to the technical field of reinforcement of existing bridges, and in particular relates to a reinforcement structure of a thin-wall pier of a continuous steel bridge and a construction method, wherein the reinforcement structure comprises a thin-wall pier foundation and a thin-wall pier vertically arranged on the thin-wall pier foundation, and a bridge deck is arranged above the thin-wall pier; the lower part of the thin-wall pier is provided with a reinforcing beam positioned on the thin-wall pier foundation, the reinforcing beam coats the thin-wall pier along the circumferential direction of the thin-wall pier, and the reinforcing beam protrudes out of the thin-wall pier foundation along the circumferential direction of the thin-wall pier foundation; still including set up in the reinforcing pile of reinforcing beam below, reinforcing beam all is provided with along bridge floor width direction L1's both ends reinforcing pile. The structural stability of the existing continuous rigid frame bridge and the thin-wall pier is ensured during the construction period of the thin-wall pier reinforcing structure and the interval tunnel downward penetrating process.
Description
Technical Field
The invention belongs to the technical field of reinforcement of existing bridges, and particularly relates to a reinforcement structure of a thin-wall pier of a continuous steel bridge and a construction method.
Background
With the networked construction of urban rail transit engineering, the urban rail transit section tunnel engineering inevitably passes through a large number of existing building structures. When a conventional bridge pile foundation is penetrated down in an urban rail transit section tunnel, the current mature method is to newly arrange a reinforcing bearing platform beam below the penetrated bridge foundation and transmit bridge load into a stratum through the newly-built pile foundation so as to achieve the purpose of pile foundation reinforcement.
The continuous steel bridge is a continuous bridge with the pier beams fixedly connected, the bridge span beams of all holes are continuous at the pier tops and fixedly connected with the pier, and the bending rigidity of the pier in the longitudinal direction of the bridge is smaller. The prestressed concrete box girder and the thin-wall pier are generally adopted, and the prestressed concrete box girder is suitable for long-span bridges. When the continuous rigid frame bridge thin-wall pier passes through the urban rail transit section tunnel, if the reinforced bearing platform beam is newly arranged below the foundation, the cross section of the continuous rigid frame bridge thin-wall pier is of a thin strip structure, the pier body rigidity is small, the external additional load bearing capacity is small, and the structure is unstable easily. More importantly, the continuous rigid frame bridge pier, the continuous beam and the foundation are all of a multi-hyperstatic structure, the allowable additional stress value caused by the change of the rigidity and the temperature change of the structure is very small, the damage of a large number of reinforcing bars planted on the periphery of the pile to the thin-wall pier is also large, and the flexible rigidity change of the thin-wall pier is ensured to be within the allowable range of 5% of the specification, so that the severe requirements are put forward on the arrangement and the structural form of the reinforcing structure.
Disclosure of Invention
The invention aims to solve the technical problem of providing a reinforcing structure and a construction method of a thin-wall pier of a continuous steel bridge, which ensure the structural stability of the existing continuous steel bridge and the thin-wall pier during the construction period of the reinforcing structure of the thin-wall pier and the downward penetrating process of an interval tunnel.
The technical scheme adopted for solving the technical problems is as follows: the reinforcing structure of the continuous steel bridge thin-wall pier comprises a thin-wall pier foundation and a thin-wall pier vertically arranged on the thin-wall pier foundation, wherein a bridge deck is arranged above the thin-wall pier; the lower part of the thin-wall pier is provided with a reinforcing beam positioned on the thin-wall pier foundation, the reinforcing beam coats the thin-wall pier along the circumferential direction of the thin-wall pier, and the reinforcing beam protrudes out of the thin-wall pier foundation along the circumferential direction of the thin-wall pier foundation;
still including set up in the reinforcing pile of reinforcing beam below, reinforcing beam all is provided with along bridge floor width direction L1's both ends reinforcing pile.
Further, the reinforcing beam comprises an inner stirrup, beam steel bars, an outer stirrup and a concrete structure;
the concrete structure is used for coating the thin-wall pier along the circumferential direction of the thin-wall pier, protruding out of the thin-wall pier foundation along the circumferential direction of the thin-wall pier foundation, and the upper end of the reinforcing pile is connected with the concrete structure;
the inner stirrup, the beam steel bar and the outer stirrup are all positioned in the concrete structure;
the inner stirrup and the outer stirrup are of a horizontally arranged annular structure; the inner stirrup is hooped on the thin-wall pier; the outer stirrup is connected with the beam steel bar, and a space is reserved between the outer stirrup and the thin-wall pier.
Further, the thin-wall pier is provided with clamping grooves which are circumferentially arranged along the thin-wall pier, and the inner stirrups are clamped in the clamping grooves.
Further, the inner stirrup and the outer stirrup are all provided with a plurality of, a plurality of the inner stirrup and a plurality of the outer stirrup are all along vertical direction equipartition.
Further, the bridge comprises a vertically arranged reinforcing ring, wherein the reinforcing ring comprises perforated steel bars horizontally arranged along the bridge span direction L2, and the perforated steel bars are installed through the thin-wall pier in a penetrating manner;
the two ends of the perforated steel bar are positioned outside the thin-wall pier and in the concrete structure; the two perforated steel bars are arranged in parallel and are vertically spaced; the two perforated steel bars are connected through a vertical bar, and the two ends of the perforated steel bars are connected with the vertical bar;
the reinforcing rings are arranged in a plurality, and the reinforcing rings are uniformly distributed along the width direction L1 of the bridge deck and are connected through connecting ribs which are horizontally arranged.
The construction method of the continuous steel bridge thin-wall pier reinforcing structure comprises the following steps:
s1, according to the outer contour line of a foundation pit, determining the positions of a foundation pit supporting pile and a reinforcing pile by on-site paying-off; constructing foundation pit supporting piles and reinforcing piles according to design requirements;
reinforcing piles are arranged on two sides of the thin-wall pier foundation along the bridge deck width direction L1, and foundation pit supporting piles are arranged on one side, away from the thin-wall pier foundation, of the reinforcing piles; the foundation pit supporting piles are arranged in a plurality, and the foundation pit supporting piles are uniformly distributed along the bridge span direction L2;
the top ends of the reinforcing piles are flush with the upper surface of the thin-wall pier foundation, and the top ends of the foundation pit supporting piles are higher than the top ends of the reinforcing piles;
s2, after the foundation pit supporting piles and the reinforcing piles reach the design strength, applying the foundation pit supporting piles to the crown beams positioned on the foundation pit supporting piles, wherein the crown beams are arranged along the bridge span direction L2; the thin-wall pier foundation is applied to crown beams along two sides of the bridge deck in the width direction L1;
after the crown beams reach the design strength, the Bailey beams are arranged along the width direction L1 of the bridge deck, one end of each Bailey beam is arranged on one crown beam, and the other end of each Bailey beam is arranged on the other crown beam; a vertical supporting structure for supporting the bridge deck is arranged on the bailey beam;
s3, excavating a foundation pit, namely excavating downwards to the thin-wall pier foundation so that the upper surface of the thin-wall pier foundation and the top end of the reinforcing pile are exposed; a reinforcing beam positioned at the lower part of the thin-wall pier is applied, so that the reinforcing beam is arranged on the foundation and the reinforcing pile of the thin-wall pier; the reinforcing beam circumferentially coats the thin-wall pier and circumferentially protrudes out of the foundation of the thin-wall pier, and two ends of the reinforcing beam in the bridge deck width direction L1 are supported by reinforcing piles;
s4, backfilling the foundation pit after the reinforced beam reaches the design strength, and dismantling the vertical supporting structure.
Further, in the step S3, a reinforcing beam is applied to the lower portion of the thin-wall pier, which includes the steps of:
erecting a template in the foundation pit, arranging a bottom plate in the template on the reinforcing pile and the thin-wall pier foundation, and surrounding a side plate in the template along the circumference of the thin-wall pier to form a pouring space which is positioned at the lower part of the thin-wall pier and is arranged along the circumference of the thin-wall pier;
applying a reinforcing ring, wherein the reinforcing ring comprises perforated steel bars horizontally arranged along the bridge span direction L2, detecting the main bar position of the thin-wall pier, avoiding the main bar position, and enabling the perforated steel bars to penetrate through the thin-wall pier and two ends of the perforated steel bars to be located outside the thin-wall pier; the two perforated steel bars are vertically spaced and are arranged in parallel, the upper perforated steel bar and the lower perforated steel bar are connected through vertical bars, the two ends of the perforated steel bars are connected with vertical bars, and the vertical bars are positioned in the pouring space;
binding and fixing the inner stirrup on the thin-wall pier along the circumferential direction of the thin-wall pier; installing beam steel bars in the pouring space, connecting and fixing outer stirrups on the beam steel bars, wherein the outer stirrups are arranged along the circumferential direction of the thin-wall pier and have a distance from the thin-wall pier; the inner stirrup and the outer stirrup are both of a horizontally arranged annular structure;
and pouring concrete into the pouring space.
Further, in the step S3, before the inner stirrup is bound and fixed on the thin-wall pier along the circumferential direction of the thin-wall pier, the method further includes the steps of: and cutting a clamping groove on the thin-wall pier, and clamping the inner stirrup in the clamping groove.
Further, in the step S3, before the inner stirrup is bound and fixed on the thin-wall pier along the circumferential direction of the thin-wall pier, the method further includes the steps of: and cleaning the outer surface of the thin-wall pier.
Further, a deformation distance is arranged between the vertical supporting structure in the step S2 and the bridge deck.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a reinforcing structure and a construction method of a thin-wall pier of a continuous steel bridge, which ensure the structural stability of the existing continuous steel bridge and the thin-wall pier during the construction period of the reinforcing structure of the thin-wall pier and the underpass process of an interval tunnel.
Drawings
FIG. 1 is a schematic view of the present invention in a cut-away configuration;
FIG. 2 is a schematic plan view of the present invention;
FIG. 3 is a schematic illustration of the present invention;
FIG. 4 is a schematic view of the structure of the thin-walled pier, the thin-walled pier foundation, the reinforcing beams and the reinforcing piles of the present invention;
FIG. 5 is a schematic structural view of the reinforcement ring of the present invention;
reference numerals: 1-a thin-wall pier foundation; 2-thin wall piers; 201-a clamping groove; 3-bridge deck; 4-reinforcing the beam; 401-inner stirrups; 402-outer stirrups; 403-concrete structure; 404-perforating the steel bars; 405-vertical ribs; 406-connecting ribs; 5-reinforcing piles; 6, foundation pit; 7-foundation pit supporting piles; 8-crown beam; 9-bailey beam; 10-vertical steel pipe support; 11-supporting beams; 12-section tunnel; 13-anchor rod.
Detailed Description
The invention will be further described with reference to the drawings and examples.
The reinforcing structure of the continuous steel bridge thin-wall pier comprises a thin-wall pier foundation 1 and a thin-wall pier 2 vertically arranged on the thin-wall pier foundation 1, wherein a bridge deck 3 is arranged above the thin-wall pier 2; the lower part of the thin-wall pier 2 is provided with a reinforcing beam 4 positioned on the thin-wall pier foundation 1, the reinforcing beam 4 coats the thin-wall pier 2 along the circumferential direction of the thin-wall pier 2, and the reinforcing beam 4 protrudes out of the thin-wall pier foundation 1 along the circumferential direction of the thin-wall pier foundation 1; still including set up in the reinforcing pile 5 of reinforcing beam 4 below, reinforcing beam 4 all is provided with along bridge floor width direction L1's both ends reinforcing pile 5.
The reinforcing column 5 is positioned between the two section tunnels 12, and the thin-wall pier foundation 1 and the reinforcing pile 5 jointly provide vertical support for the reinforcing beam 4. Through setting up the stiffening beam 4 at the circumference of thin wall mound 2, make stiffening beam 4 hold thin wall mound 2, consolidate thin wall mound 2, improve the atress intensity, improve the structural stability of continuous steel structure bridge.
The reinforcing beam 4 may comprise a concrete structure and beam steel bars arranged in the concrete structure. In order to improve the connection strength of the reinforcing beam 4 and the thin-walled pier 2, it is preferable that the reinforcing beam 4 includes an inner stirrup 401, a beam reinforcing bar, an outer stirrup 402, and a concrete structure 403; the concrete structure 403 is used for coating the thin-wall pier 2 along the circumferential direction of the thin-wall pier 2, protruding out of the thin-wall pier foundation 1 along the circumferential direction of the thin-wall pier foundation 1, and the upper end of the reinforcing pile 5 is connected with the concrete structure 403; the inner stirrup 401, beam rebar and outer stirrup 402 are all located in the concrete structure 403; the inner stirrup 401 and the outer stirrup 402 are both horizontally arranged annular structures; the inner stirrup 401 is hooped on the thin-wall pier 2; the outer stirrup 402 is connected to the beam reinforcement with a spacing from the thin-walled pier 2. The beam rebar provides mounting support for the outer stirrup 402 and the thin-walled pier 2 provides mounting support for the inner stirrup 401. The concrete structure 403 adopts micro-expansion concrete, so that the outer stirrup 402 and the inner stirrup 401 generate tightening force on the thin-wall pier 2, the vertical friction force between the reinforcing beam 4 and the thin-wall pier 2 is increased, and the connection strength between the reinforcing beam 4 and the thin-wall pier 2 is improved.
In order to limit the inner stirrup 401, it is preferable that the thin-wall pier 2 is provided with a clamping groove 201 circumferentially arranged along the thin-wall pier 2, and the inner stirrup 401 is clamped in the clamping groove 201. The inner stirrup 401 is limited by the clamping groove 201, so that the inner stirrup 401 is stably installed and is tightly connected with the thin-wall pier 2.
As a preferred embodiment, the inner stirrup 401 and the outer stirrup 402 are provided with a plurality of stirrups, and a plurality of the inner stirrup 401 and a plurality of the outer stirrup 402 are uniformly distributed along the vertical direction.
In order to further improve the connection strength between the thin-wall pier 2 and the reinforcing beam 4, the reinforcing ring preferably further comprises a vertically arranged reinforcing ring, wherein the reinforcing ring comprises perforated steel bars 404 horizontally arranged along the bridge span direction L2, and the perforated steel bars 404 are installed in a penetrating way through the thin-wall pier 2; both ends of the perforated steel bar 404 are positioned outside the thin-walled pier 2 and in the concrete structure 403; two perforated steel bars 404 are arranged, and the two perforated steel bars 404 are vertically spaced and are arranged in parallel; the two perforated steel bars 404 are connected through a vertical bar 405, and the two ends of the perforated steel bars 404 are connected with the vertical bar 405; the reinforcing rings are arranged in a plurality, and the reinforcing rings are uniformly distributed along the width direction L1 of the bridge deck and are connected through connecting ribs 406 which are horizontally arranged. By arranging the reinforcing ring, the connection strength of the thin-wall pier 2 and the reinforcing beam 4 is further improved, the shearing bearing capacity is improved, and the integrity is better.
The construction method of the continuous steel bridge thin-wall pier reinforcing structure comprises the following steps:
s1, according to the outer contour line of a foundation pit 6, determining the positions of a foundation pit supporting pile 7 and a reinforcing pile 5 by on-site paying-off; constructing foundation pit supporting piles 7 and reinforcing piles 5 according to design requirements;
reinforcing piles 5 are arranged on two sides of the thin-wall pier foundation 1 along the bridge deck width direction L1, and foundation pit supporting piles 7 are arranged on one side, away from the thin-wall pier foundation 1, of the reinforcing piles 5; the foundation pit supporting piles 7 are arranged in a plurality, and the foundation pit supporting piles 7 are uniformly distributed along the bridge span direction L2;
the top of the reinforcement pile 5 is flush with the upper surface of the thin-wall pier foundation 1, and the top of the foundation pit support pile 7 is higher than the top of the reinforcement pile 5.
In order to improve the structural stability of the side slope of the foundation pit 6, the side slope of the foundation pit 6 is preferably anchored by anchor rods 13.
S2, after the foundation pit supporting piles 7 and the reinforcing piles 5 reach the design strength, applying the crown beams 8 positioned on the foundation pit supporting piles 7, wherein the crown beams 8 are arranged along the bridge span direction L2; the thin-wall pier foundation 1 is provided with crown beams 8 along two sides of the bridge deck width direction L1;
after the crown beams 8 reach the design strength, the Bailey beams 9 arranged along the bridge deck width direction L1 are applied, one end of each Bailey beam 9 is arranged on one crown beam 8, and the other end is arranged on the other crown beam 8; a vertical support structure for supporting the deck 3 is mounted on the bailey beam 9.
Specifically, the vertical supporting structure comprises vertical steel pipe supports 10, a plurality of vertical steel pipe supports 10 are uniformly distributed along the circumference of the thin-wall pier 2, and supporting beams 11 which are adjacently arranged with the bridge deck 3 are arranged above the plurality of vertical steel pipe supports 10. A deformation distance is arranged between the support beam 11 and the lower surface of the bridge deck 3. The bridge deck 3, the supporting beam 11, the vertical steel pipe support 10, the bailey beam 9 and the crown beam 8 are sequentially arranged from top to bottom, and the supporting beam 11, the vertical steel pipe support 10, the bailey beam 9 and the crown beam 8 provide auxiliary support for the bridge deck 3, so that the construction safety is improved.
S3, excavating a foundation pit 6, and excavating downwards to the position of the thin-wall pier foundation 1 so that the upper surface of the thin-wall pier foundation 1 and the top end of the reinforcing pile 5 are exposed; a reinforcing beam 4 positioned at the lower part of the thin-wall pier 2 is applied, so that the reinforcing beam 4 is arranged on the thin-wall pier foundation 1 and the reinforcing pile 5; the reinforcing beam 4 circumferentially coats the thin-wall pier 2 and circumferentially protrudes out of the thin-wall pier foundation 1, and two ends of the reinforcing beam 4 in the bridge deck width direction L1 are supported by the reinforcing piles 5;
the crown beam 8 is positioned at the top of the foundation pit 6, and the edge of the top of the foundation pit 6 is provided with a bearing surface for bearing the end part of the crown beam 8 so as to avoid the sinking of the crown beam 8. After the excavation of the foundation pit 6 is completed, the upper surface of the thin-wall pier foundation 1 and the top end of the reinforcing pile 5 are exposed, so that the subsequent construction of the reinforcing beam 4 is facilitated. The reinforced beam 4 after construction is positioned at the bottom of the foundation pit 6, and a space is reserved between the crown beam 8 and the reinforced beam 4. The reinforcing piles 5 and the thin-walled pier foundation 1 together provide vertical support for the reinforcing beam 4.
Preferably, in the step S3, the reinforcing beam 4 is applied to the lower portion of the thin-walled pier 2, which includes the steps of:
erecting a template in the foundation pit 6, and arranging a bottom plate in the template on the reinforcing pile 5 and the thin-wall pier foundation 1, wherein a side plate in the template surrounds the thin-wall pier 2 along the circumferential direction of the thin-wall pier 2 to form a pouring space which is positioned at the lower part of the thin-wall pier 2 and is arranged along the circumferential direction of the thin-wall pier 2;
applying a reinforcing ring, wherein the reinforcing ring comprises perforated steel bars 404 horizontally arranged along the bridge span direction L2, detecting the main bar position of the thin-wall pier 2, avoiding the main bar position, and enabling the perforated steel bars 404 to penetrate through the thin-wall pier 2 and two ends of the perforated steel bars 404 to be positioned outside the thin-wall pier 2; the two perforated steel bars 404 are vertically spaced and are arranged in parallel, the upper perforated steel bar 404 and the lower perforated steel bar 404 are connected through vertical bars 405, the two ends of the perforated steel bar 404 are connected with vertical bars 405, and the vertical bars 405 are positioned in the pouring space;
binding and fixing the inner stirrup 401 on the thin-wall pier 2 along the circumferential direction of the thin-wall pier 2; installing beam steel bars in the pouring space, connecting and fixing the outer stirrups 402 on the beam steel bars, wherein the outer stirrups 402 are arranged along the circumferential direction of the thin-wall pier 2 and have a distance from the thin-wall pier 2; the inner stirrup 401 and the outer stirrup 402 are both horizontally arranged annular structures;
and pouring concrete into the pouring space.
Preferably, in the step S3, before the inner stirrup 401 is bound and fixed on the thin-walled pier 2 along the circumferential direction of the thin-walled pier 2, the method further includes the steps of: a clamping groove 201 is cut on the thin-wall pier 2, and the inner stirrup 401 is clamped in the clamping groove 201.
Preferably, in the step S3, before the inner stirrup 401 is bound and fixed on the thin-walled pier 2 along the circumferential direction of the thin-walled pier 2, the method further includes the steps of: the outer surface of the thin-walled pier 2 is cleaned.
S4, backfilling the foundation pit 6 after the reinforced beam 4 reaches the design strength, and dismantling the vertical supporting structure.
The removal of the vertical support structure is specifically referred to as the removal of the vertical steel pipe support 10 and the support beam 11.
The scheme is practically applied to the three-phase engineering of the No. 18 line of the adult rail transit, and the reinforcement of the thin-wall pier of the man-south overpass between the s bridge station of the nijia and the south bridge station of the train. The displacement of the foundation and the bridge deck of the existing continuous steel bridge is controlled within 5mm, and the displacement meets the specification within 10mm specified by the specification.
The above is a specific embodiment of the invention, and it can be seen from the implementation process that the invention provides a reinforcing structure and a construction method for a thin-wall pier of a continuous steel bridge, so as to ensure the structural stability of the existing continuous rigid bridge and thin-wall pier during the construction period of the reinforcing structure of the thin-wall pier and the downward penetrating process of an interval tunnel.
Claims (10)
1. The reinforcing structure of the thin-wall pier of the continuous steel bridge comprises a thin-wall pier foundation (1) and a thin-wall pier (2) vertically arranged on the thin-wall pier foundation (1), wherein a bridge deck (3) is arranged above the thin-wall pier (2); the thin-wall pier foundation is characterized in that a reinforcing beam (4) positioned on the thin-wall pier foundation (1) is arranged at the lower part of the thin-wall pier (2), the thin-wall pier (2) is coated by the reinforcing beam (4) along the circumferential direction of the thin-wall pier (2), and the reinforcing beam (4) protrudes out of the thin-wall pier foundation (1) along the circumferential direction of the thin-wall pier foundation (1);
still including set up in reinforcement stake (5) of reinforcement roof beam (4) below, reinforcement roof beam (4) all are provided with along bridge floor width direction L1's both ends reinforcement stake (5).
2. The reinforcing structure of a thin-walled pier of a continuous steel bridge according to claim 1, characterized in that the reinforcing beam (4) comprises an inner stirrup (401), a beam reinforcement, an outer stirrup (402) and a concrete structure (403);
the concrete structure (403) is used for coating the thin-wall pier (2) along the circumferential direction of the thin-wall pier (2), protruding out of the thin-wall pier foundation (1) along the circumferential direction of the thin-wall pier foundation (1), and the upper end of the reinforcing pile (5) is connected with the concrete structure (403);
the inner stirrup (401), the beam rebar and the outer stirrup (402) are all located in the concrete structure (403);
the inner stirrup (401) and the outer stirrup (402) are both of a horizontally arranged annular structure; the inner stirrup (401) is hooped on the thin-wall pier (2); the outer stirrup (402) is connected with the beam steel bar, and a space is reserved between the outer stirrup and the thin-wall pier (2).
3. The reinforcing structure of the thin-wall pier of the continuous steel bridge according to claim 2, wherein the thin-wall pier (2) is provided with clamping grooves (201) arranged along the circumferential direction of the thin-wall pier, and the inner stirrups (401) are clamped in the clamping grooves (201).
4. The reinforcing structure of the thin-wall pier of the continuous steel bridge according to claim 2, wherein a plurality of inner stirrups (401) and a plurality of outer stirrups (402) are arranged, and the inner stirrups (401) and the outer stirrups (402) are uniformly distributed along the vertical direction.
5. The reinforcing structure of a thin-walled pier of a continuous steel bridge according to claim 2, further comprising a vertically arranged reinforcing ring comprising perforated steel bars (404) horizontally arranged in the span direction L2, the perforated steel bars (404) being installed through the thin-walled pier (2);
both ends of the perforated steel bar (404) are positioned outside the thin-wall pier (2) and in the concrete structure (403); the two perforated steel bars (404) are arranged in parallel, and the two perforated steel bars (404) are vertically spaced; the two perforated steel bars (404) are connected through a vertical bar (405), and the two ends of the perforated steel bars (404) are connected with the vertical bar (405);
the reinforcing rings are arranged in a plurality, are uniformly distributed along the width direction L1 of the bridge deck and are connected through connecting ribs (406) which are horizontally arranged.
6. A method for constructing a reinforcing structure of a thin-walled pier of a continuous steel bridge, characterized in that the reinforcing structure of the thin-walled pier of the continuous steel bridge as claimed in any one of claims 1 to 5 is constructed, comprising the steps of:
s1, according to the outer contour line of a foundation pit (6), determining the positions of a foundation pit supporting pile (7) and a reinforcing pile (5) by on-site paying-off; constructing foundation pit supporting piles (7) and reinforcing piles (5) according to design requirements;
reinforcing piles (5) are arranged on two sides of the thin-wall pier foundation (1) along the bridge deck width direction L1, and foundation pit supporting piles (7) are arranged on one side, away from the thin-wall pier foundation (1), of each reinforcing pile (5); the foundation pit supporting piles (7) are arranged in a plurality, and the foundation pit supporting piles (7) are uniformly distributed along the bridge span direction L2;
the top ends of the reinforcing piles (5) are flush with the upper surface of the thin-wall pier foundation (1), and the top ends of the foundation pit supporting piles (7) are higher than the top ends of the reinforcing piles (5);
s2, after the foundation pit supporting piles (7) and the reinforcing piles (5) reach the design strength, constructing a crown beam (8) positioned on the foundation pit supporting piles (7), wherein the crown beam (8) is arranged along the span direction L2; the thin-wall pier foundation (1) is provided with crown beams (8) along two sides of the bridge deck width direction L1;
after the crown beams (8) reach the design strength, the bridge deck is applied with the Bailey beams (9) arranged along the width direction L1 of the bridge deck, one end of each Bailey beam (9) is arranged on one crown beam (8), and the other end is arranged on the other crown beam (8); a vertical supporting structure for supporting the bridge deck (3) is arranged on the bailey beam (9);
s3, excavating a foundation pit (6), and excavating downwards to the position of the thin-wall pier foundation (1) so that the upper surface of the thin-wall pier foundation (1) and the top end of the reinforcing pile (5) are exposed; a reinforcing beam (4) positioned at the lower part of the thin-wall pier (2) is applied, so that the reinforcing beam (4) is arranged on the thin-wall pier foundation (1) and the reinforcing piles (5); the reinforcing beam (4) circumferentially coats the thin-wall pier (2) and circumferentially protrudes out of the thin-wall pier foundation (1), and two ends of the reinforcing beam (4) in the bridge deck width direction L1 are supported by the reinforcing piles (5);
s4, backfilling the foundation pit (6) after the reinforced beam (4) reaches the design strength, and dismantling the vertical support structure.
7. The method for constructing the thin-walled pier reinforcing structure of the continuous steel bridge according to claim 6, wherein the step S3 of applying the reinforcing beam (4) at the lower portion of the thin-walled pier (2) comprises the steps of:
erecting a template in the foundation pit (6), and arranging a bottom plate in the template on the reinforcing pile (5) and the thin-wall pier foundation (1), wherein side plates in the template are surrounded along the circumference of the thin-wall pier (2) to form a pouring space which is positioned at the lower part of the thin-wall pier (2) and is circumferentially arranged along the thin-wall pier (2);
applying a reinforcing ring, wherein the reinforcing ring comprises perforated steel bars (404) horizontally arranged along the bridge span direction L2, detecting the main bar position of the thin-wall pier (2), avoiding the main bar position, and enabling the perforated steel bars (404) to penetrate through the thin-wall pier (2) and two ends of the perforated steel bars (404) to be positioned outside the thin-wall pier (2); the two perforated steel bars (404) are vertically spaced and are arranged in parallel, the upper perforated steel bar (404) and the lower perforated steel bar (404) are connected through vertical bars (405), the two ends of the perforated steel bars (404) are connected with the vertical bars (405), and the vertical bars (405) are positioned in the pouring space;
binding and fixing the inner stirrup (401) on the thin-wall pier (2) along the circumferential direction of the thin-wall pier (2); installing beam steel bars in a pouring space, connecting and fixing outer stirrups (402) on the beam steel bars, wherein the outer stirrups (402) are arranged along the circumferential direction of the thin-wall pier (2) and have a distance from the thin-wall pier (2); the inner stirrup (401) and the outer stirrup (402) are both of a horizontally arranged annular structure;
and pouring concrete into the pouring space.
8. The construction method of the thin-wall pier reinforcing structure of the continuous steel bridge according to claim 7, wherein in the step S3, before the inner stirrup (401) is bound and fixed on the thin-wall pier (2) along the circumferential direction of the thin-wall pier (2), the method further comprises the steps of: a clamping groove (201) is cut on the thin-wall pier (2), and the inner stirrup (401) is clamped in the clamping groove (201).
9. The construction method of the thin-wall pier reinforcing structure of the continuous steel bridge according to claim 7, wherein in the step S3, before the inner stirrup (401) is bound and fixed on the thin-wall pier (2) along the circumferential direction of the thin-wall pier (2), the method further comprises the steps of: and cleaning the outer surface of the thin-wall pier (2).
10. The construction method of the thin-wall pier reinforcing structure of the continuous steel bridge according to claim 7, wherein a deformation distance is arranged between the vertical supporting structure and the bridge deck (3) in the step S2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311038260.3A CN117005332A (en) | 2023-08-17 | 2023-08-17 | Reinforcing structure of thin-wall pier of continuous steel bridge and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311038260.3A CN117005332A (en) | 2023-08-17 | 2023-08-17 | Reinforcing structure of thin-wall pier of continuous steel bridge and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117005332A true CN117005332A (en) | 2023-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311038260.3A Pending CN117005332A (en) | 2023-08-17 | 2023-08-17 | Reinforcing structure of thin-wall pier of continuous steel bridge and construction method |
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| Country | Link |
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| CN (1) | CN117005332A (en) |
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2023
- 2023-08-17 CN CN202311038260.3A patent/CN117005332A/en active Pending
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