CN105297641A - Highway T beam diaphragm plate prestress reinforcing structure and working method for reinforcement using reinforcing structure - Google Patents
Highway T beam diaphragm plate prestress reinforcing structure and working method for reinforcement using reinforcing structure Download PDFInfo
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- CN105297641A CN105297641A CN201510713965.XA CN201510713965A CN105297641A CN 105297641 A CN105297641 A CN 105297641A CN 201510713965 A CN201510713965 A CN 201510713965A CN 105297641 A CN105297641 A CN 105297641A
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Abstract
The invention belongs to the technical field of highway bridge reinforcing projects , and discloses a highway T beam diaphragm plate prestress reinforcing structure and a working method for reinforcement using the reinforcing structure. The highway T beam diaphragm plate prestress reinforcing structure is mainly characterized by comprising a beam body and diaphragm plates, wherein concrete reinforcing bodies are arranged on two sides of the diaphragm plates in the lateral direction of a bridge, under the diaphragm plates, and on two sides of the diaphragm plates under the beam body in the longitudinal direction of the bridge; lateral post-embedded bars are arranged between the beam body and the concrete reinforcing bodies; vertical post-embedded bars are arranged at the bottom of the beam body; lateral main reinforcing bars and flat bellows in which lateral prestress bars are arranged are arranged in the concrete reinforcing bodies; the lateral main reinforcing bars and the flat bellows are respectively connected with the lateral post-embedded bars through large stirrups and are connected with the vertical post-embedded bars through small stirrups; under-anchor backing plates and multi-hole flat anchorage devices are arranged at two end parts of each of the concrete reinforcing bodies. According to the highway T beam diaphragm plate prestress reinforcing structure disclosed by the invention, the beam body is not damaged; the lateral join disease problem of the highway bridge is solved through utilizing an active reinforcing technology with prestress, and the durability of T beams is improved.
Description
Technical field
The invention belongs to highway bridge stabilization works technical field, particularly relate to one and utilize prestressing technique, to having the highway T beam diaphragm prestressed reinforcement structure that the diaphragm of disease bridge carries out active enforcement and the engineering method of reinforcing with it.
Background technology
RC T-beam due to possess save material, stressed clear and definite, calculate the advantages such as simple, construction technology is ripe, be that highway in China applies maximum Fabricated Simple Supported Beams bridges at present.Meanwhile, along with the various reasons in operation process, cause bridge main will produce following disease:
(1) transverse splicing disease: diaphragm cracking, junction steel plate sealing-off, fracture;
(2) disease of beam body: occur the diseases such as the infiltration of bridge wing plate longitudinal cracking, beam-ends diagonal cracking, beam-ends cracking;
(3) bearing damage: seat empty, bearing shear strain are excessive.
According to investigations, bridge lateral connection disease is the main disease of T beam, its Major Diseases origin cause of formation: in building course, the wet seam construction quality of diaphragm is poor more with overloaded vehicle in operation process.
After disease appears in diaphragm, just become weak part, transverse splicing weakens, and causes that superstructure globality is stressed to be weakened, and is equivalent to increase the stressed of each single-beam, very huge to the injury of bridge.
The existing reinforcement means to bridge lateral connection disease has:
(1) affixing steel plate
Adopting affixing steel plate to reinforce diaphragm, is be fixed on former diaphragm by steel plate high-strength bolt, and contact surface adopts adhesive bond, reaches the object of reinforcement and strengthening;
(2) concreting again
Dig out Cast-in-Situ Segment between former diaphragm, bar planting, diaphragm both sides are thickeied, again build diaphragm concrete, recover transverse splicing between girder;
(3) to reform deck paving
Adopting the method strengthening deck paving bar diameter to repair hinge seam cracking disease, is based on former deck paving steel mesh reinforcement intended diameter is too small or grid is excessive, or the hinge seam cracking disease caused due to construction quality reason and the method for maintaining that carries out.
Above reinforcement means is all directly set up tension or shearing resistance supporting material in the tensile region or shearing resistance weak area that are reinforced diaphragm, and this reinforcement means belongs to passive enforcement category from principle.The strain of rear supporting material, Stress resort and passive stressed, only bear mobile load and vehicular load and after add the internal stress of dead load.Thus, the performance of supporting material is difficult to play a role.The fundamental way improving supporting material utilization ratio is that to become passive enforcement be active enforcement, to rear supporting material Shi Hanzhang, forms prestressing force active enforcement system.
To being arranged in the supporting material Shi Hanzhang be reinforced on diaphragm, form prestressing force active enforcement system, although also have use in the transversely strengthening of railroad bridge etc., but the mechanism of action of highway bridge mobile load is more complicated, beam body cross section is less, can not punch wear muscle as railroad bridge on web.
Summary of the invention
First technical problem that the present invention will solve just is to provide the highway T beam diaphragm prestressed reinforcement structure of a kind of basis not destroying former beam being carried out highway bridge diaphragm active enforcement.
For solving the problems of the technologies described above, the technical solution used in the present invention is: comprise beam body and diaphragm, the direction across bridge both sides of described diaphragm and below and diaphragm both sides below beam body, be provided with concrete intensive aspect along bridge, horizontal bar planting is provided with between beam body and concrete intensive aspect, vertical bar planting is provided with bottom beam body, the oblate corrugated duct of horizontal main reinforcement and built-in transverse prestressed muscle is provided with in concrete intensive aspect, horizontal main reinforcement is connected with horizontal bar planting respectively by large stirrup with oblate corrugated duct, be connected with vertical bar planting by little stirrup, concrete intensive aspect both ends are provided with anchor backing plate, porous flat ground tackle.
Its additional technical feature is: the end face of described concrete intensive aspect and beam body and diaphragm are connected as a single entity, beam body bottom surface 10-20cm is protruded in the bottom surface of concrete intensive aspect, and the oblate corrugated duct of built-in transverse prestressed muscle is arranged in the concrete intensive aspect of protrusion beam body bottom surface;
The peak of described concrete intensive aspect is positioned at edge on beam body web bottom, horse-hof shape beam body;
The surface of described concrete intensive aspect is provided with protective coating.
Second technical problem that the present invention will solve just is to provide the engineering method that a kind of highway T beam diaphragm prestressed reinforcement structure carries out reinforcing.
For solving the problems of the technologies described above, the technical solution used in the present invention comprises the steps:
The first step cuts the concrete that every sheet diaphragm damages, and checks and again welds the reinforcing bar damaged in diaphragm;
Second step detects the reinforcing bar in every sheet beam body, avoids the reinforcing bar line in beam body, determines each beam body bar planting position;
3rd step is holed on beam body, and new, the old concrete interface of dabbing beam body and diaphragm, make newly-increased concrete intensive aspect can become to be integrated with beam body concrete and diaphragm concrete, jointly stressed;
4th step cleaning hole and concrete interface, plants horizontal bar planting, vertical bar planting;
5th step ties up the oblate corrugated duct of horizontal main reinforcement and built-in transverse prestressed muscle under beam body and diaphragm, horizontal main reinforcement is connected with horizontal bar planting respectively by large stirrup with oblate corrugated duct, is connected with longitudinal bar planting by little stirrup, transversely prestressed bars be arranged under beam body along outside in the 10-20cm that protrudes, and to arrange and mooring anchor lower bolster, porous flat ground tackle under beam body and diaphragm;
6th step at beam body and diaphragm both sides formwork supporting plate, the oblate corrugated duct of horizontal main reinforcement, large stirrup, little stirrup, built-in transverse prestressed muscle in template, concreting, form removal to desired strength, curing concrete is to design strength value;
7th step use post stretching to design load to transversely prestressed bars Shi Hanzhang, is poured into composite mortar, is formed with binding prestress structure in oblate corrugated duct;
8th step is protected prestressed porous flat ground tackle end-blocking, and newly-increased diaphragm external surface and concrete intensive aspect external surface protective coating, improve durability.
A kind of highway T beam diaphragm prestressed reinforcement structure provided by the present invention, comprises during construction and increases diaphragm cross section, Shi Hanzhang and pattern handling three phases.The direction across bridge both sides of equidirectional every sheet diaphragm and below and diaphragm both sides below beam body, be provided with concrete intensive aspect along bridge, the end face of concrete intensive aspect and beam body and diaphragm are connected as a single entity, beam body bottom surface 10-20cm is protruded in the bottom surface of concrete intensive aspect, the peak of concrete intensive aspect is positioned at edge on beam body web bottom, horse-hof shape beam body, the width position of diaphragm both sides, will carry out calculating design according to the concrete condition of each bridge.
A kind of highway T beam diaphragm prestressed reinforcement structure provided by the present invention, by equidirectional beam body transversely prestressed bars is cascaded, mode simultaneously in increase cross section, diaphragm bottom, diaphragm lower edge crack and lower edge tensile stress can be effectively reduced, the basis of increasing section adds suitable prestressing force, the tensile stress of diaphragm lower edge crack and lower edge can be reduced further.After diaphragm lower edge Shi Hanzhang, in reserved oblate corrugated duct duct, pour into high performance composite mortar, itself and concrete intensive aspect are bonded as one, make rear supporting material active force, by increasing diaphragm cross section and newly-increased prestressed effect, improve the duty of beam body.
A kind of highway T beam diaphragm prestressed reinforcement structure provided by the present invention, on the basis not destroying beam body, prestressing force active enforcement technology is utilized to solve the transverse splicing disease problem of highway bridge, improve the utilization ratio of T beam durability and increase supporting material, reach and reduce integrated cost and difficulty of construction, recover the reinforcing object of transverse splicing between girder.A kind of highway T beam diaphragm prestressed reinforcement structure provided by the present invention, one is strengthen diaphragm sectional area, and according to design calculation result bar planting and layout reinforcing bar, concreting, plays the effect strengthening and laterally connect and bear pre-loaded support struts.Two is that transversely prestressed bars is arranged in outside the lower edge of beam body, does not get through hole, do not destroy the intensity of beam body at Liang Tishang.Being cascaded and Shi Hanzhang by equidirectional T beam with whole transversely prestressed bars, is that a kind of post stretching has bonding external prestressing structure.And the layout quantity of transversely prestressed bars, transversely prestressed bars stretch-draw force value etc., all to carry out calculating design according to the concrete condition of each bridge.Horizontal bar planting, vertical bar planting, horizontal main reinforcement, large stirrup, the material of little stirrup is Q345, concrete requirement of strength is determined according to designing and calculating, oblate corrugated duct performance indications should meet the regulation of JG225 standard, anchor backing plate is not less than HT300, porous flat ground tackle performance indications should meet the regulation of GB/T14370 standard, transversely prestressed bars performance indications should meet the regulation of GB/T5224 standard, the intensity of composite mortar grouting material is not less than M30 level, water-repellent paint is polyurethanes water-repellent paint, performance indications should meet II type in GB/T19250, color is the light gray close to beam body.
Accompanying drawing explanation
Structure before the reinforcing of Tu1Wei highway T beam and disease schematic diagram;
Fig. 2 is structure and the disease enlarged diagram at A place in Fig. 1;
Fig. 3 is the structural representation that a kind of highway T of the present invention beam diaphragm prestressed reinforcement structure direction across bridge increases cross section and transversely prestressed bars layout newly;
Fig. 4 is the structure enlarged diagram at B place in Fig. 3.
Detailed description of the invention
Be described further below in conjunction with the concrete structure of drawings and embodiments to a kind of highway T beam diaphragm prestressed reinforcement structure provided by the present invention.
As shown in Figure 1, the highway T beam before reinforcing comprises beam body 1, beam body 1 time original multiple diaphragm 2.
As shown in Figure 2, the highway T beam before reinforcing comprises beam body 1, beam body 1 time original multiple diaphragm 2, the concrete 3 that diaphragm 2 has damage, the reinforcing bar 4 damaged.
As shown in Figure 3, a kind of highway T of the present invention beam diaphragm prestressed reinforcement structure, direction across bridge comprises beam body 1, and beam body 1 time original multiple diaphragm 2, is provided with concrete intensive aspect 5 below diaphragm 2 He below diaphragm 2 liang of curb girder bodies 1.
As shown in Figure 4, the direction across bridge both sides of diaphragm 2 and be provided with concrete intensive aspect 5 along bridge with diaphragm 2 both sides below beam body 1 below, horizontal bar planting 6 is provided with between beam body 1 and concrete intensive aspect 5, vertical bar planting 7 is provided with bottom beam body 1, the oblate corrugated duct 10 of horizontal main reinforcement 8 and built-in transverse prestressed muscle 9 is provided with in concrete intensive aspect 5, horizontal main reinforcement 8 is connected with horizontal bar planting 6 respectively by large stirrup 11 with oblate corrugated duct 10, be connected with vertical bar planting 7 by little stirrup 12, concrete intensive aspect 5 both ends are provided with anchor backing plate 13, porous flat ground tackle 14.
A kind of highway T beam diaphragm prestressed reinforcement structure provided by the present invention, comprises during construction and increases diaphragm cross section, Shi Hanzhang and pattern handling three phases.The direction across bridge both sides of equidirectional every sheet diaphragm 2 and below below beam body 1, be provided with concrete intensive aspect 5 along bridge with diaphragm 2 both sides, the end face of concrete intensive aspect 5 and beam body 1 and diaphragm 2 are connected as a single entity, beam body 1 bottom surface 10-20cm is protruded in the bottom surface of concrete intensive aspect 5, the peak of concrete intensive aspect 5 is positioned at edge on beam body web bottom, horse-hof shape beam body, the width position of diaphragm 2 both sides, will carry out calculating design according to the concrete condition of each bridge.Concrete steps are as follows:
The first step cuts the concrete 3 that every sheet diaphragm 2 damages, and checks and again welds the reinforcing bar 4 damaged in diaphragm 2;
Second step detects the reinforcing bar in every sheet beam body 1, avoids the reinforcing bar line in beam body 1, determines each beam body 1 bar planting position;
3rd step is holed on beam body 1, and new, the old concrete interface of dabbing beam body 1 and diaphragm 2, make newly-increased concrete intensive aspect can become to be integrated with beam body concrete and diaphragm concrete, jointly stressed;
4th step cleaning hole and concrete interface, plants horizontal bar planting 6, vertical bar planting 7;
5th step ties up the oblate corrugated duct 10 of horizontal main reinforcement 8 and built-in transverse prestressed muscle 9 for 2 times at beam body 1 and diaphragm, horizontal main reinforcement 8 is connected with horizontal bar planting 6 respectively by large stirrup 11 with oblate corrugated duct 10, is connected with longitudinal bar planting 7 by little stirrup 12, transversely prestressed bars 9 is arranged in the 10-20cm that protrudes outside beam body 1 time edge, and arranges and mooring anchor lower bolster 13, porous flat ground tackle 14 for 2 times at beam body 1 and diaphragm;
6th step at beam body 1 and diaphragm 2 both sides formwork supporting plate, the oblate corrugated duct 10 of horizontal main reinforcement 8, large stirrup 11, little stirrup 12, built-in transverse prestressed muscle 9 in template, concreting, form removal to desired strength, curing concrete is to design strength value;
7th step uses post stretching to transversely prestressed bars 9 Shi Hanzhang to design load, and in oblate corrugated duct 10, perfusion composite mortar, is formed with binding prestress structure;
8th step is protected prestressed porous flat ground tackle 14 end-blocking, and newly-increased diaphragm external surface and concrete intensive aspect 5 external surface protective coating, improve durability.
A kind of highway T beam diaphragm prestressed reinforcement structure provided by the present invention, by equidirectional beam body 1 transversely prestressed bars 9 is cascaded, mode simultaneously in increase cross section, diaphragm 2 bottom, diaphragm 2 lower edge crack and lower edge tensile stress can be effectively reduced, the basis of increasing section adds suitable prestressing force, the tensile stress of diaphragm 2 lower edge crack and lower edge can be reduced further.After diaphragm 2 lower edge Shi Hanzhang, in reserved oblate corrugated duct 10 duct, pour into high performance composite mortar, itself and concrete intensive aspect are bonded as one, make rear supporting material active force, by increasing diaphragm 2 cross section and newly-increased prestressed effect, improve the duty of beam body 1.
A kind of highway T beam diaphragm prestressed reinforcement structure provided by the present invention, on the basis not destroying beam body 1, prestressing force active enforcement technology is utilized to solve the transverse splicing disease problem of highway bridge, improve the utilization ratio of T beam durability and increase supporting material, reach and reduce integrated cost and difficulty of construction, recover the reinforcing object of transverse splicing between girder.A kind of highway T beam diaphragm prestressed reinforcement structure provided by the present invention, one is strengthen diaphragm sectional area, and according to design calculation result bar planting and layout reinforcing bar, concreting, plays the effect strengthening and laterally connect and bear pre-loaded support struts.Two is that transversely prestressed bars 9 is arranged in outside the lower edge of beam body 1, beam body 1 does not get through hole, does not destroy the intensity of beam body 1.Be cascaded by equidirectional T beam with whole transversely prestressed bars 9, Shi Hanzhang is that a kind of post stretching has bonding external prestressing structure.And the layout quantity of transversely prestressed bars 9, transversely prestressed bars 9 stretch-draw force value etc., all to carry out calculating design according to the concrete condition of each bridge.
A kind of highway T beam diaphragm prestressed reinforcement structure provided by the present invention and be not limited only to said structure by the engineering method that it carries out reinforcing; above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (5)
1. highway T beam diaphragm prestressed reinforcement structure, comprise beam body and diaphragm, it is characterized in that: the direction across bridge both sides of described diaphragm and below and diaphragm both sides below beam body, be provided with concrete intensive aspect along bridge, horizontal bar planting is provided with between beam body and concrete intensive aspect, vertical bar planting is provided with bottom beam body, the oblate corrugated duct of horizontal main reinforcement and built-in transverse prestressed muscle is provided with in concrete intensive aspect, horizontal main reinforcement is connected with horizontal bar planting respectively by large stirrup with oblate corrugated duct, be connected with vertical bar planting by little stirrup, concrete intensive aspect both ends are provided with anchor backing plate, porous flat ground tackle.
2. highway T beam diaphragm prestressed reinforcement structure according to claim 1, it is characterized in that: the end face of described concrete intensive aspect and beam body and diaphragm are connected as a single entity, beam body bottom surface 10-20cm is protruded in the bottom surface of concrete intensive aspect, and the oblate corrugated duct of built-in transverse prestressed muscle is arranged in the concrete intensive aspect of protrusion beam body bottom surface.
3. highway T beam diaphragm prestressed reinforcement structure according to claim 2, is characterized in that: the peak of described concrete intensive aspect is positioned at edge on beam body web bottom, horse-hof shape beam body.
4. highway T beam diaphragm prestressed reinforcement structure according to claim 1, is characterized in that: the surface of described concrete intensive aspect is provided with protective coating.
5. carry out the engineering method of reinforcing by the highway T beam diaphragm prestressed reinforcement structure described in claim 1,2,3 or 4, it is characterized in that comprising the steps:
The first step cuts the concrete that every sheet diaphragm damages, and checks and again welds the reinforcing bar damaged in diaphragm;
Second step detects the reinforcing bar in every sheet beam body, avoids the reinforcing bar line in beam body, determines each beam body bar planting position;
3rd step is holed on beam body, and new, the old concrete interface of dabbing beam body and diaphragm, make newly-increased concrete intensive aspect can become to be integrated with beam body concrete and diaphragm concrete, jointly stressed;
4th step cleaning hole and concrete interface, plants horizontal bar planting, vertical bar planting;
5th step ties up the oblate corrugated duct of horizontal main reinforcement and built-in transverse prestressed muscle under beam body and diaphragm, horizontal main reinforcement is connected with horizontal bar planting respectively by large stirrup with oblate corrugated duct, is connected with vertical bar planting by little stirrup, transversely prestressed bars be arranged under beam body along outside in the 10-20cm that protrudes, and to arrange and mooring anchor lower bolster, porous flat ground tackle under beam body and diaphragm;
6th step at beam body and diaphragm both sides formwork supporting plate, the oblate corrugated duct of horizontal main reinforcement, large stirrup, little stirrup, built-in transverse prestressed muscle in template, concreting, form removal to desired strength, curing concrete is to design strength value;
7th step use post stretching to design load to transversely prestressed bars Shi Hanzhang, is poured into composite mortar, is formed with binding prestress structure in oblate corrugated duct;
8th step is protected prestressed porous flat ground tackle end-blocking, and newly-increased diaphragm external surface and concrete intensive aspect external surface protective coating, improve durability.
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Cited By (8)
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| CN105821777A (en) * | 2016-05-13 | 2016-08-03 | 安徽省交通规划设计研究总院股份有限公司 | Prestressed concrete diaphragm for connection of old bridge and new bridge and construction method of prestressed concrete diaphragm |
| CN105970837A (en) * | 2016-05-31 | 2016-09-28 | 西安公路研究院 | Unbounded prestress and steel plate-concrete combined reinforcing design method of T-type beam |
| CN106087778A (en) * | 2016-05-31 | 2016-11-09 | 西安公路研究院 | The prestressing without bondn of box beam and steel plate concrete composite reinforcement method for designing |
| CN106758873A (en) * | 2016-11-11 | 2017-05-31 | 太原理工大学 | A kind of punching prestressing force strengthens the method that diaphragm plate is connected with girder |
| CN107604830A (en) * | 2017-09-19 | 2018-01-19 | 芜湖铁路桥梁制造有限公司 | The reinforcement means of Bridge Crack |
| CN107916625A (en) * | 2017-12-25 | 2018-04-17 | 山西省交通规划勘察设计院 | A kind of widening structure and its method of width cantilever boxgirder |
| CN110748185A (en) * | 2019-10-25 | 2020-02-04 | 中国林业科学研究院木材工业研究所 | In-situ bar planting pouring and reinforcing method for partially rotten ancient building wood beam |
| CN114382019A (en) * | 2021-12-30 | 2022-04-22 | 浙江正方交通建设有限公司 | Active service T-beam bridge comprehensive reinforcement structure and construction method |
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| CN110748185A (en) * | 2019-10-25 | 2020-02-04 | 中国林业科学研究院木材工业研究所 | In-situ bar planting pouring and reinforcing method for partially rotten ancient building wood beam |
| CN114382019A (en) * | 2021-12-30 | 2022-04-22 | 浙江正方交通建设有限公司 | Active service T-beam bridge comprehensive reinforcement structure and construction method |
| CN114382019B (en) * | 2021-12-30 | 2024-05-24 | 浙江正方交通建设有限公司 | Active T-beam bridge comprehensive reinforcement structure and construction method |
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