CN112554071A - Construction method for prestress splicing wide seam of new and old bridge - Google Patents
Construction method for prestress splicing wide seam of new and old bridge Download PDFInfo
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- CN112554071A CN112554071A CN202011489653.2A CN202011489653A CN112554071A CN 112554071 A CN112554071 A CN 112554071A CN 202011489653 A CN202011489653 A CN 202011489653A CN 112554071 A CN112554071 A CN 112554071A
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling 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
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
- E01D19/04—Bearings; Hinges
- E01D19/041—Elastomeric bearings
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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
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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Abstract
The invention discloses a construction method of a prestressed wide splicing seam of a new bridge and an old bridge, which comprises the following steps: s1, reserving splicing reinforcing steel bars on the side faces of the new bridge hollow slabs; s2, installing self-tapping bolts on the side face of the old bridge hollow slab; s3, laying a new bridge reinforcing mesh on the upper end face of the new bridge hollow slab, and welding the self-tapping bolt and the reserved splicing reinforcing steel bars; s4, arranging a hydraulic jack between the new bridge hollow slab and the old bridge hollow slab; s5, pushing the new bridge hollow slab to generate horizontal displacement or turnover displacement through a hydraulic jack; s6, paving a lower reinforcing mesh at the joint wide seam, and then pouring joint wide seam concrete; s7, gradually completely unloading and dismantling the hydraulic jack; s8, paving a wide seam splicing reinforcing mesh at the top end of the wide seam splicing concrete, and welding the wide seam splicing reinforcing mesh with an old bridge reinforcing mesh and a new bridge reinforcing mesh; s9, pouring bridge deck concrete on the spliced wide seam steel bar net; and S10, paving the pavement asphalt mixture to complete the construction operation of splicing the new bridge and the old bridge.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to a construction method of a prestressed wide splicing seam of a new bridge and an old bridge.
Background
With the rapid development of economy in China, part of the built bridges cannot meet the increasing traffic demand, and in order to improve the situation, more and more bridges are widened and rebuilt.
At present, the transverse splicing of a new bridge and an old bridge in the bridge width splicing engineering mostly adopts a mode of upper structure connection and lower structure separation, under the splicing mode, the internal force of the lower structure of the new bridge and the old bridge cannot generate mutual influence, and meanwhile, the connection of the upper structure has small influence on the internal force of the old bridge, so that the bridge width splicing engineering is widely applied to the bridge width splicing engineering.
For historical reasons, about 90% of old bridges of the new and old bridge widening projects which are finished at home at present are concrete beam bridges, and the widened bridges have quality problems and durability problems to a certain extent in the use process, wherein some of the old bridges and the new bridges have a series of action differences caused by bridge forming time differences of the new and old bridges and poor integrity between the new bridge and the old bridge after splicing, for example, a new foundation settlement deformation exists in a newly-built bridge, the shrinkage creep problem of the new concrete spliced bridge exists, and the like, the differences can bring different action effects to the spliced bridge, and some quality problems are generated in the construction process, for example, due to the action of vehicle load in the construction process, the vibration generated by the old bridge can cause the splicing wide seam concrete to crack or even crack and the like. In order to reduce the quality problem of the width-spliced bridge, in addition to further deeply researching the problem caused by the aging difference of the new bridge and the old bridge, the development of a new construction key technology which can adapt to different construction objects and conditions is a new subject faced by enterprises.
Through research, the bridge widening structure in the prior art has the following problems:
1. in the process of splicing the wide joints, because the traffic of an old bridge cannot be interrupted, under the influence of the continuous vibration of the old bridge, the newly poured splicing wide joint concrete can generate cracks in the initial setting process, and the strength of the concrete is seriously influenced;
2. in the use process of the wide splicing bridge, due to inconsistent foundation settlement of a new bridge and an old bridge, a large shearing force and shearing deformation can be generated at the wide splicing seam, the shearing effect generated after the self-tapping bolt on the old bridge is connected with the reserved steel bar on the new bridge is not obvious, and the wide splicing seam concrete can generate an inclined crack of 45 degrees; meanwhile, under the continuous action of the dynamic load of the vehicle, the wide splicing seam between the new bridge and the old bridge also generates bending and shearing deformation, and when negative bending moment occurs at the wide splicing seam, tensile cracks are generated at the top of the wide splicing seam, so that the quality problems of premature breakage and the like of pavement materials are caused;
3. although the shrinkage creep of the concrete has been compensated by pouring steel fiber concrete or UEA (concrete expansion material) in the prior art, the negative effect of the shrinkage creep of the concrete on the quality of the widening joints cannot be completely counteracted, cracks are still generated at the positions of the widening joints, and the structural strength of the bridge deck after the old bridge is widened is influenced.
Disclosure of Invention
The invention aims to solve the problems and provides a construction method of a prestress widening seam of a new bridge and an old bridge, which can prevent the seam between the new bridge and the old bridge from generating cracks in the construction process.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a construction method for a prestressed wide joint of a new bridge and an old bridge comprises the following steps:
s1, installing a new bridge pier cross beam in the lateral direction of the old bridge hollow slab, installing a new bridge rubber elastic support at the upper end of the new bridge pier cross beam, processing and producing the new bridge hollow slab in a concrete precast member workshop, and reserving splicing steel bars on the side surface of the new bridge hollow slab;
s2, removing one end of the old bridge deck material close to the new bridge hollow slab, simultaneously reserving the old bridge reinforcing mesh on the bridge deck, and installing a self-tapping bolt on the side surface of the old bridge hollow slab;
s3, mounting the new bridge hollow slab on a new bridge rubber elastic support, paving a new bridge reinforcing mesh on the upper end face of the new bridge hollow slab, and paving a new bridge deck material above one end, far away from the old bridge hollow slab, of the new bridge hollow slab; after prepressing and after the foundation of the pier of the new bridge is settled stably, welding the self-tapping bolts on the old bridge hollow slab and the reserved splicing reinforcing steel bars on the hollow slab of the new bridge to form the tie reinforcing steel bars;
s4, horizontally arranging a hydraulic jack between the new bridge hollow slab and the old bridge hollow slab or vertically arranging a hydraulic jack below one end of the new bridge hollow slab close to the old bridge hollow slab;
s5, pushing the new bridge hollow slab to generate horizontal displacement or turnover displacement by increasing the thrust of the hydraulic jack;
s6, maintaining the thrust of the hydraulic jack unchanged, laying a lower reinforcing mesh at a wide joint between the new bridge hollow slab and the old bridge hollow slab, and pouring wide joint concrete on the lower reinforcing mesh;
s7, gradually reducing the thrust of a hydraulic jack in the initial setting stage of the spliced wide-seam concrete, and gradually transferring the pressure removed by the hydraulic jack to the spliced wide-seam concrete; completely unloading and dismantling the hydraulic jack after the splicing wide seam concrete reaches the design strength;
s8, paving a wide seam splicing reinforcing mesh at the top end of the wide seam splicing concrete, and welding the wide seam splicing reinforcing mesh, an old bridge reinforcing mesh reserved on the old bridge deck and a new bridge reinforcing mesh on the upper end face of the new bridge hollow slab into a whole;
s9, pouring bridge deck concrete on the spliced wide seam steel bar net, and enabling the bridge deck concrete to be flush with the upper end surfaces of the old bridge deck material and the new bridge deck material;
and S10, after the bridge deck concrete is cured, paving road surface asphalt mixture on the upper end surfaces of the bridge deck concrete, the old bridge deck material and the new bridge deck material at one time, and completing the construction operation of widening the new bridge and the old bridge.
Furthermore, the spliced wide seam concrete and the bridge deck concrete are both made of steel fiber concrete or concrete expansion materials.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the invention provides a new construction method for splicing wide joints of new and old bridges, which can generate pre-pressure in the spliced wide joint concrete and prevent the spliced wide joint concrete from generating tensile stress in the construction process and the use process; thereby avoiding the condition that the construction quality is influenced by the crack at the joint of the wide seam;
2. the construction method utilizes the new bridge rubber elastic support at the lower part of the hollow slab and the tie steel bars between the new bridge and the old bridge, and achieves the purpose of applying pre-pressure to the spliced wide-seam concrete through the tensile force generated by the tie steel bars and the elastic restoring force of the new bridge rubber elastic support under the action of the pre-pressure of the hydraulic jack;
3. the new construction method provided by the invention has the advantages that additional structural members and corresponding production and manufacturing costs are not required to be added, the construction process is simple, the construction period is not greatly increased, and the economic benefit is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a first construction process diagram of example 1;
FIG. 2 is a second construction process diagram of example 1;
FIG. 3 is a third construction process diagram of example 1;
FIG. 4 is a fourth construction process diagram of example 1;
FIG. 5 is a fifth construction process diagram of example 1;
FIG. 6 is a sixth construction process diagram of example 1;
FIG. 7 is a seventh construction process diagram of example 1;
FIG. 8 is an eighth construction process diagram of example 1;
FIG. 9 is a ninth construction process diagram according to example 1;
FIG. 10 is a construction process diagram of example 1;
FIG. 11 is a fourth construction process diagram of example 2;
FIG. 12 is a fifth construction process diagram of example 2;
FIG. 13 is a sixth construction process diagram of example 2;
fig. 14 is a process diagram seven of the construction of example 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art without any creative effort, should be included in the protection scope of the present invention.
As shown in fig. 1 to 10, the present embodiment discloses a construction method of a prestressed wide-seam splicing of a new bridge and an old bridge, which utilizes lateral horizontal displacement to increase the prestress of the concrete of the wide-seam splicing; the concrete construction steps are as follows:
(a) installing a new bridge pier beam 2 and a new bridge rubber elastic support 3 in the lateral direction of an old bridge hollow slab 1, processing a new bridge hollow slab 4 in a concrete prefabricated part workshop, and reserving splicing steel bars 5 on the side surface of the new bridge hollow slab 4;
(b) removing part of old bridge deck materials, simultaneously reserving an old bridge reinforcing mesh 6 of the old bridge deck, and installing self-tapping bolts 7 on the side surface of the old bridge hollow slab 1;
(c) installing the new bridge hollow slab 4 in place, paving a new bridge reinforcing mesh 8 on the full bridge surface, and paving a new bridge deck material 9 on part of the new bridge hollow slab; after prepressing and basically stabilizing the settlement of the pier foundation of the new bridge, welding the self-tapping bolts 7 on the old bridge hollow slab and the reserved splicing steel bars 5 on the new bridge hollow slab into a whole to obtain the tie steel bars 10;
(d) arranging a plurality of hydraulic jacks 11 between the new and old bridge hollow plates along the horizontal direction;
(e) and in a standard allowable range, loading the hydraulic jack 11 according to theoretical calculation data and actual measurement and control data, and pushing the new bridge hollow slab 4 to generate horizontal displacement. At the moment, the tie bars 10 between the new bridge and the old bridge generate tension, the rubber elastic supports 3 of the new bridge at the lower parts of the new bridge and the old bridge generate transverse horizontal elastic restoring force, and the tension of the tie bars 10 and the elastic restoring force of the rubber elastic supports 3 of the new bridge are balanced with the thrust of the hydraulic jack 11;
(f) maintaining the thrust of a hydraulic jack 11 unchanged, laying a lower reinforcing mesh 12 at the joint of the new bridge and the old bridge, and then pouring steel fiber concrete or UEA (concrete expansion material) at the upper part of the joint to obtain joint wide concrete 13;
(g) the thrust of the hydraulic jack 11 is gradually reduced in the initial setting stage of the wide seam splicing concrete 13, and the removed pressure is gradually transferred to the wide seam splicing concrete 13 to be pressed; and completely unloading and dismantling the hydraulic jack 11 after the splicing wide seam concrete 13 reaches the designed strength. At the moment, the pressure born by the splicing wide seam concrete 13 is balanced with the tension of the tie bar 10 and the elastic restoring force of the new bridge rubber elastic support 3;
(h) paving the splicing wide seam reinforcing mesh 14 at the splicing wide seams of the new bridge and the old bridge, and welding the splicing wide seam reinforcing mesh 14 with the old bridge reinforcing mesh 6 and the new bridge reinforcing mesh 8 reserved by the old bridge into a whole;
(i) pouring steel fiber concrete or UEA (concrete expansion material) at the upper part of the splicing wide seam to form bridge deck concrete 15 for compensating the shrinkage creep of the concrete;
(j) after the bridge deck concrete 15 is cured, paving the road surface asphalt mixture 16 on the old bridge, the new bridge and the wide splicing seam at one time, and completing the wide splicing construction operation of the new bridge and the old bridge.
(a) installing a new bridge pier beam 2 and a new bridge rubber elastic support 3 in the lateral direction of an old bridge hollow slab 1, processing a new bridge hollow slab 4 in a concrete prefabricated part workshop, and reserving splicing steel bars 5 on the side surface of the new bridge hollow slab 4;
(b) removing part of old bridge deck materials, simultaneously reserving an old bridge reinforcing mesh 6 of the old bridge deck, and installing self-tapping bolts 7 on the side surface of the old bridge hollow slab 1;
(c) installing the new bridge hollow slab 4 in place, paving a new bridge reinforcing mesh 8 on the full bridge surface, and paving a new bridge deck material 9 on part of the new bridge hollow slab; after prepressing and basically stabilizing the settlement of the pier foundation of the new bridge, welding the self-tapping bolts 7 on the old bridge hollow slab and the reserved splicing steel bars 5 on the new bridge hollow slab into a whole to obtain the tie steel bars 10;
(d) a plurality of hydraulic jacks 11 are vertically arranged at positions between the bottom of one end of the new bridge hollow slab close to the old bridge hollow slab and the upper end face of the new bridge pier beam;
(e) in a standard allowable range, according to theoretical calculation data and actual measurement and control data, upward thrust is applied to the hydraulic jack 11, and the new bridge hollow slab 4 rotates clockwise integrally under the action of torque generated by eccentric thrust. At this time, the tie bar 10 between the new bridge and the old bridge also generates a tensile force. Taking the new bridge rubber elastic support as a moment center, wherein the moment generated by the self weight of the new bridge hollow slab is balanced with the moment generated by the pulling force of the tie bar 10 and the moment generated by the pushing force of the hydraulic jack 11;
(f) maintaining the thrust of a hydraulic jack 11 unchanged, laying a lower reinforcing mesh 12 at the joint of the new bridge and the old bridge, and then pouring steel fiber concrete or UEA (concrete expansion material) at the upper part of the joint to obtain joint wide concrete 13;
(g) the thrust of the hydraulic jack 11 is gradually reduced in the initial setting stage of the splice joint concrete 13, the new bridge hollow slab 4 rotates anticlockwise under the combined action of the moment generated by the self gravity and the moment of the tie bar 10, and meanwhile, the pressure action is exerted on the splice joint concrete 13; and completely unloading and dismantling the hydraulic jack 11 after the splicing wide seam concrete 13 reaches the designed strength. At this time, the resultant moment generated by the pressure born by the splicing seam concrete 13 is balanced with the moment of the tie bar 10 and the self-gravity moment of the new bridge hollow slab 4;
(h) paving the splicing wide seam reinforcing mesh 14 at the splicing wide seams of the new bridge and the old bridge, and welding the splicing wide seam reinforcing mesh 14 with the old bridge reinforcing mesh 6 and the new bridge reinforcing mesh 8 reserved by the old bridge into a whole;
(i) pouring steel fiber concrete or UEA (concrete expansion material) at the upper part of the splicing wide seam to form bridge deck concrete 15 for compensating the shrinkage creep of the concrete;
(j) after the bridge deck concrete 15 is cured, paving the road surface asphalt mixture 16 on the old bridge, the new bridge and the wide splicing seam at one time, and completing the wide splicing construction operation of the new bridge and the old bridge.
The wide joint splicing construction method provided by the invention can generate pre-pressure in the concrete body of the wide joint splicing, and the concrete body of the wide joint splicing is always in a pressed state no matter in the construction process or later use, so that common quality problems such as cracking, damage and the like of the wide joint splicing can be prevented and reduced; and moreover, the tie bars between the new bridge and the old bridge and the rubber elastic support under the hollow slab of the bridge are fully utilized, additional auxiliary structures are not required to be additionally manufactured, installed and disassembled, the occupied space and time are minimum, the construction efficiency and the construction quality can be obviously improved, and the economic benefit is good.
Claims (2)
1. A construction method for splicing a wide seam by prestress for new and old bridges is characterized by comprising the following steps: the method comprises the following steps:
s1, installing a new bridge pier cross beam in the lateral direction of the old bridge hollow slab, installing a new bridge rubber elastic support at the upper end of the new bridge pier cross beam, processing and producing the new bridge hollow slab in a concrete precast member workshop, and reserving splicing steel bars on the side surface of the new bridge hollow slab;
s2, removing one end of the old bridge deck material close to the new bridge hollow slab, simultaneously reserving the old bridge reinforcing mesh on the bridge deck, and installing a self-tapping bolt on the side surface of the old bridge hollow slab;
s3, mounting the new bridge hollow slab on a new bridge rubber elastic support, paving a new bridge reinforcing mesh on the upper end face of the new bridge hollow slab, and paving a new bridge deck material above one end, far away from the old bridge hollow slab, of the new bridge hollow slab; after prepressing and after the foundation of the pier of the new bridge is settled stably, welding the self-tapping bolts on the old bridge hollow slab and the reserved splicing reinforcing steel bars on the hollow slab of the new bridge to form the tie reinforcing steel bars;
s4, horizontally arranging a hydraulic jack between the new bridge hollow slab and the old bridge hollow slab or vertically arranging a hydraulic jack below one end of the new bridge hollow slab close to the old bridge hollow slab;
s5, pushing the new bridge hollow slab to generate horizontal displacement or turnover displacement by increasing the thrust of the hydraulic jack;
s6, maintaining the thrust of the hydraulic jack unchanged, laying a lower reinforcing mesh at a wide joint between the new bridge hollow slab and the old bridge hollow slab, and pouring wide joint concrete on the lower reinforcing mesh;
s7, gradually reducing the thrust of a hydraulic jack in the initial setting stage of the spliced wide-seam concrete, and gradually transferring the pressure removed by the hydraulic jack to the spliced wide-seam concrete; completely unloading and dismantling the hydraulic jack after the splicing wide seam concrete reaches the design strength;
s8, paving a wide seam splicing reinforcing mesh at the top end of the wide seam splicing concrete, and welding the wide seam splicing reinforcing mesh, an old bridge reinforcing mesh reserved on the old bridge deck and a new bridge reinforcing mesh on the upper end face of the new bridge hollow slab into a whole;
s9, pouring bridge deck concrete on the spliced wide seam steel bar net, and enabling the bridge deck concrete to be flush with the upper end surfaces of the old bridge deck material and the new bridge deck material;
and S10, after the bridge deck concrete is cured, paving road surface asphalt mixture on the upper end surfaces of the bridge deck concrete, the old bridge deck material and the new bridge deck material at one time, and completing the construction operation of widening the new bridge and the old bridge.
2. The construction method of the prestressed wide-joint seam of the new bridge and the old bridge as claimed in claim 1, characterized in that: the spliced wide-seam concrete and the bridge deck concrete are both made of steel fiber concrete or concrete expansion materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011489653.2A CN112554071B (en) | 2020-12-16 | 2020-12-16 | Construction method for prestress wide joint of new and old bridges |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011489653.2A CN112554071B (en) | 2020-12-16 | 2020-12-16 | Construction method for prestress wide joint of new and old bridges |
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| CN112554071A true CN112554071A (en) | 2021-03-26 |
| CN112554071B CN112554071B (en) | 2022-05-20 |
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| JP2009180011A (en) * | 2008-01-31 | 2009-08-13 | Ihi Corp | Method of replacing sliding resin plate for supporting bridge |
| CN102286921A (en) * | 2011-05-25 | 2011-12-21 | 河南省九建工程有限公司 | bridge widening splicing structure and construction method thereof |
| CN203383142U (en) * | 2013-02-04 | 2014-01-08 | 郑州长发电子科技有限公司 | Semi-rigid butt seam suitable for widening of hollow slab bridge |
| CN105908632A (en) * | 2016-05-28 | 2016-08-31 | 中交公局第三工程有限公司 | Hybrid girder cable-stayed bridge closure front girder body pre-bias pushing device |
| CN109137761A (en) * | 2018-09-29 | 2019-01-04 | 中铁二局集团有限公司 | A method of it controlling existing bridge and to widen bridge settlement poor |
| CN209538039U (en) * | 2018-12-29 | 2019-10-25 | 湖南科技大学 | One kind closing up thrustor for prestressed concrete continuous rigid-framed bridge |
-
2020
- 2020-12-16 CN CN202011489653.2A patent/CN112554071B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009180011A (en) * | 2008-01-31 | 2009-08-13 | Ihi Corp | Method of replacing sliding resin plate for supporting bridge |
| CN102286921A (en) * | 2011-05-25 | 2011-12-21 | 河南省九建工程有限公司 | bridge widening splicing structure and construction method thereof |
| CN203383142U (en) * | 2013-02-04 | 2014-01-08 | 郑州长发电子科技有限公司 | Semi-rigid butt seam suitable for widening of hollow slab bridge |
| CN105908632A (en) * | 2016-05-28 | 2016-08-31 | 中交公局第三工程有限公司 | Hybrid girder cable-stayed bridge closure front girder body pre-bias pushing device |
| CN109137761A (en) * | 2018-09-29 | 2019-01-04 | 中铁二局集团有限公司 | A method of it controlling existing bridge and to widen bridge settlement poor |
| CN209538039U (en) * | 2018-12-29 | 2019-10-25 | 湖南科技大学 | One kind closing up thrustor for prestressed concrete continuous rigid-framed bridge |
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