CN106320189A - Transverse reinforcing construction method of existing railway line T beam - Google Patents
Transverse reinforcing construction method of existing railway line T beam Download PDFInfo
- Publication number
- CN106320189A CN106320189A CN201610760281.XA CN201610760281A CN106320189A CN 106320189 A CN106320189 A CN 106320189A CN 201610760281 A CN201610760281 A CN 201610760281A CN 106320189 A CN106320189 A CN 106320189A
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- construction method
- anchoring
- reinforcing steel
- presstressed reinforcing
- hole
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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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a transverse reinforcing construction method of an existing railway line T beam. According to the method, it is proposed for the first time that a method with a detector and a radar scanner combined is adopted to accurately position transverse reinforcing drilling hole sites, and the situation that existing bridge rebars and steel strands are damaged due to inaccurate positioning, and the quality of a beam body is affected is avoided. By means of the precise positioning method, waste of labor and material resources is avoided, the construction period is guaranteed, and benefits are created. The problem of construction hidden danger of an existing bridge during existing line reinforcement can be well solved, damage to the existing bridge can be avoided, and large market application prospects and project approval research value are achieved.
Description
Technical field
The present invention relates to technical field of building construction, be specifically related to a kind of transversely strengthening for Existing Railway Line T beam and execute
Work method.
Background technology
Pre-stressed concrete simple-support T-sectional girder is applied very wide in China's Existing Railway Bridges, and these Simple T-Girders are mostly designed at 20 generation
Discipline 60～the seventies, two panels T beam, along longitudinally spaced apart, is connected by transverse horizontal joint cover, and negligible amounts, it is impossible to play completely
Ensure that 2 T beams are interconnected into entirety mutually, the common effect resisting transverse curvature.Through long-term operation, the most in recent years at railway
During speed-raising, the diaphragm plate fracture of some beams, concrete scaling, when train passes through, span centre lateral amplitude of vibration is excessive, can not
Meet the requirement of China's existing railroad bridge calibrating specification, it is therefore necessary to these railroad bridges are carried out strengthening reconstruction to meet
The requirement of safe operation.
At present, domestic reinforce existing T beam carries out the common method such as contrasting according to survey meter and original design figure and carries out laterally
Reinforcing boring location, for T beam transversely strengthening, existing technology can only have preliminary judgement to steel bar arrangement situation, it is impossible to accurately
Location, easily damages beam body reinforcing bar and prestress wire during boring.
Summary of the invention
The present invention provides the transversely strengthening construction method of a kind of Existing Railway Line T beam, it is ensured that can accurately detect beam body reinforcing bar
Distribution situation, thus it is accurately positioned drilling hole position.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that
The transversely strengthening construction method of a kind of Existing Railway Line T beam, comprises the steps:
1) detection beam body reinforcing bar distribution: use special reinforced survey meter tentatively to detect judgement, re-use radar scanning accurately detecting
Go out beam body reinforcing bar distribution situation；
2) presstressed reinforcing steel duct boring；
3) anchor bar is implanted: vertically have the reinforcing bar at prestressing force to use the strongest anchoring bag anchoring, without the horizontal steel of presstressed reinforcing steel
Muscle uses anchoring adhesive anchoring；
4) carry out presstressed reinforcing steel installation, and transverse horizontal connection template is installed；
5) need before the concreting of transverse horizontal joint cover presstressed reinforcing steel is carried out initial tensioning；
6) after casting concrete, health preserving, form removal, then presstressed reinforcing steel is carried out whole stretch-draw, mud jacking and sealing off and covering anchorage.
Step 2) in, the bore diameter of employing is 40mm, after having holed, cleans up with water in hole.
In step 3), uprightly being soaked in water by anchoring bag sealing end when using anchoring bag, soak time with not effervescent is
Standard, is rapidly inserted into the reinforcing bar that need to anchor, fastening floating aperture after filling up boring.
In step 3), anchoring adhesive anchoring method particularly includes: carry out pre-initially with the special filling gun of bar planting and combining nozzle
Note, inserts combining nozzle and starts injecting glue at the bottom of hole, slowly will move outside combining nozzle, it is ensured that bubble-free or hole in hole while injecting glue
Gap, injecting glue to fill up hole depth about 2/3 implants reinforcing bar by the mode rotated continuously until colloid flows out, and cured.
In step 4), presstressed reinforcing steel initial tensioning order is: two of first simultaneous tension span centre section, then simultaneous tension beam-ends section
Two.
In step 6), the condition of whole stretch-draw is: lateral connection is reached design strength by concrete strength, elastic modelling quantity
After 95%, carrying out whole stretch-draw, tension sequence is: pretensioning away from nearest two sections of span centre, then order other sections of stretch-draw.
In step 6), during to presstressed reinforcing steel termination sealing off and covering anchorage, use pea gravel concreten sealing off and covering anchorage, the straight and even light of sealing off and covering anchorage top of concrete
Sliding, with existed concrete bridge binding site brushing 2～3 road water-repellent paint.
From above technical scheme, the present invention, under conditions of not interrupting transport, is carried by the method for transversely strengthening
The lateral stiffness of high beam body and the span centre lateral amplitude of vibration of reduction beam, reduce cost；In the step of detection beam body reinforcing bar trend
Propose binding reinforcement survey meter, the method for geological radar scanning first, be accurately positioned out transversely strengthening bore position, it is to avoid
Damaging existing bridge reinforcement, steel strand wires because location is inaccurate, affect beam body quality, the method for this " precise positioning " is not
Only avoid the waste of man power and material, it is ensured that the duration.
Detailed description of the invention
A kind of preferred implementation of the present invention is described in detail below.
Bridge vibration of beam is the outer excited vibration caused by running train on bridge, the size of its vibratory response and dynamic excitation
The ability i.e. rigidity of bridge of size resistance to deformation with bridge own is relevant.The most wired bridge master under speed-raising with heavy condition
Wanting problem is exactly car, bridge Transverse Vibration of A Roller, seeks to improve the lateral stiffness problem of bridge for the most wired bridge.Horizontal
It is through, to the principle reinforced, the lateral stiffness of setting up transverse horizontal joint cover to improve bridge, thus reduces train when passing through
Lateral amplitude of vibration, it is ensured that railway operation safety.
Concretely comprising the following steps of transversely strengthening construction method of the present invention:
(1) mobile plug-in hanging basket platform, interior room paving operating platform are made
For guaranteeing bridge strengthening operator safety, first make before construction on mobile plug-in hanging basket platform, T beam base plate and lay behaviour
Make platform.
According to on-site actual situations, when carrying out stretch-draw and sealing off and covering anchorage operation outside beam sheet, use moving hanging basket as operation
Platform.
(2) detection beam body reinforcing bar moves towards, determines drilling hole position
Transversely strengthening uses the fining twisted steel of φ 25, needs to hole by design attitude before construction.Do not injure for guaranteeing to hole
Steel bar stress and steel strand wires, should be familiar with beam body reinforcing bar and presstressed reinforcing steel distribution in the special bridge of design drawing (01) 2051 before drilling construction
Situation, then verifies beam body reinforcing bar and corrugated tube trend, determines suitable drilling hole position.Detection uses special reinforcing bar survey meter
The detection method combined with radar scanning, is accurately positioned out bore position.
(3) presstressed reinforcing steel duct boring
After the position, hole of a piece of beam is drilled, whether the position, hole that should check corresponding a piece of T beam has deviation, if there have deviation to carry out to be micro-
Adjust, it is ensured that two film perforation positions align；Presstressed reinforcing steel pipeline uses steel thimble pore-forming.Seam crossing should carry out encapsulation process (steel pipe with
Rubber seal is clogged between web), must not spillage.
(4) beam body surface dabbing
Newly-increased transverse horizontal joint cover and beam body joint portion are carried out dabbing process.Dabbing uses electric hand drill, the dabbing degree of depth
5-10mm, cuts effect and is advisable to expose fresh concrete, and dabbing area cannot be less than the 70% of contact area.Cut complete, use
The floating dust on surface is blown clean by airduct, and washing makes contact surface moisten.
(5) anchor bar is implanted
By the drift along special brush of employing and clear hole more than at least three times repeatedly of air blowing cylinder in eyelet before bar planting.Must not deposit in hole
Water, must not have floating ash.
The reinforcing bar at prestressing force is vertically had to use the strongest anchoring bag anchoring.By upright for anchoring bag sealing end when using anchoring to wrap
Soaking in water, soak time is as the criterion (about 50-120s) with not effervescent, is rapidly inserted into the reinforcing bar that need to anchor after filling up boring,
Urgent with hand hammer, floating aperture.
Horizontal reinforcement without presstressed reinforcing steel uses anchoring adhesive anchoring, carries out initially with the special filling gun of bar planting and combining nozzle
Pre-note, inserts combining nozzle and starts injecting glue at the bottom of hole, slowly will move outside combining nozzle while injecting glue, it is ensured that in hole bubble-free or
Hole, injecting glue to fill up hole depth about 2/3 implants reinforcing bar by the mode rotated continuously until colloid flows out, tight in hardening time
Prohibit disturbance reinforcing bar.
First bar planting effect must be done pullout tests before large area bar planting, can large area after determining suitable technological parameter
Construction.
(6) steel bar meter, colligation, presstressed reinforcing steel are installed
Reinforcing bar binding construction is carried out after presstressed reinforcing steel sleeve pipe installation.Oil stain, paint dirt should be cleaned out before Steel Reinforcing Bar Material,
Blanking is straight, without local warpage.
Transverse horizontal joint cover reinforcing bar binding completes, after prestressed casing installation, penetrate presstressed reinforcing steel before formwork erection.In advance
Stress rib uses the fining twisted steel of φ 25mm.Presstressed reinforcing steel cutting length determines according to the size of stretch-draw jack.Should ensure that
Fixing end protruded length is not less than 30mm.Presstressed reinforcing steel uses abrasive machine to cut off, and forbids to use electric arc, acetylene to burn and cuts, prestressing force
Muscle is installed and should be smoothed out, vertical with beam body.
(7) bridge floor fill orifice is set
First filling concrete hole is accomplished fluently before transverse horizontal joint cover envelope mould, it is to avoid during punching, floating dust cannot be removed.Fill orifice position
It is arranged in the wet seaming position between two panels beam in the middle part of transverse horizontal joint cover.Opening diameter 10cm, 1 meter arranges 1.Fill orifice
Use corning machine to take hole, take Kong Qianxian and verify beam body reinforcing bar and presstressed reinforcing steel position, avoid main muscle and presstressed reinforcing steel.
(8) model sheetinstallat
Transverse horizontal joint cover template is divided into side form and bed die, and template must carry out clearing up, brushing oil, to ensure coagulation in a pre-installation
Soil surfacing, bright and clean it is prone to the demoulding.Between two panels T beam, transverse horizontal joint cover width is 1.805m.First the end in beam body
Squeeze into the spacer bar of a row φ 16mm below mould every 60cm, spacer bar anchors into 15cm in beam body.Traverse 5 on spacer bar
The lumps of wood of root 10*10cm does bed die longitudinal bands, spacing 45cm mono-.Completing bed die in longitudinal bands, adjust absolute altitude, recycling is laterally
The vertical main muscle of horizontal coupled plate does suspension rod and bed die and reinforcing bar is linked as entirety, suspension rod horizontally set 3 road, spacing 52.5cm together,
Longitudinal pitch 60cm is together.After bed die installation, side form is placed on bed die, with Screw arbor with nut at both-ends, side form is fixed.Install
After to go through the fastness of each suspension rod the most reliable.
(9) presstressed reinforcing steel initial tensioning
Needing before transverse horizontal joint cover concreting presstressed reinforcing steel is carried out initial tensioning, the stretching force of every presstressed reinforcing steel is
50KN, want slowly during oil pump oil-feed during stretch-draw, steadily, to after predetermined stretch-draw value, oil return unloading.
Presstressed reinforcing steel initial tensioning order is: pretensioning away from nearest two sections of span centre, then order other section of stretch-draw.Every section four
The tension sequence of root presstressed reinforcing steel: middle two of first simultaneous tension, then two, simultaneous tension side.
Presstressed reinforcing steel initial tensioning pours transverse horizontal joint cover concrete in time after completing.
(10) casting concrete, health preserving, form removal.
(11) presstressed reinforcing steel stretch-draw at end, mud jacking, sealing off and covering anchorage
The tension sequence of presstressed reinforcing steel stretch-draw at end: pretensioning away from nearest two sections of span centre, then order other section of stretch-draw.Every section four
The tension sequence of root presstressed reinforcing steel: middle two of first simultaneous tension, then two, simultaneous tension side.If in stretching process laterally
The bottom of horizontal coupled plate occurs that crack must stop stretch-draw and adjust tension force.
During to presstressed reinforcing steel termination sealing off and covering anchorage, using pea gravel concreten sealing off and covering anchorage, sealing off and covering anchorage top of concrete is straight and even smooth, with existing
Concrete binding site brushing 2～3 road water-repellent paint.
The above embodiment is only to be described the preferred embodiment of the present invention, the not model to the present invention
Enclose and be defined, on the premise of designing spirit without departing from the present invention, the those of ordinary skill in the art technical side to the present invention
Various deformation that case is made and improvement, all should fall in the protection domain that claims of the present invention determines.
Claims (7)
1. the transversely strengthening construction method of an Existing Railway Line T beam, it is characterised in that comprise the steps:
1) detection beam body reinforcing bar distribution: use special reinforced survey meter tentatively to detect judgement, re-use radar scanning accurately detecting
Go out beam body reinforcing bar distribution situation；
2) presstressed reinforcing steel duct boring；
3) anchor bar is implanted: vertically have the reinforcing bar at prestressing force to use the strongest anchoring bag anchoring, without the horizontal steel of presstressed reinforcing steel
Muscle uses anchoring adhesive anchoring；
4) carry out presstressed reinforcing steel installation, and transverse horizontal connection template is installed；
5) need before the concreting of transverse horizontal joint cover presstressed reinforcing steel is carried out initial tensioning；
6) after casting concrete, health preserving, form removal, then presstressed reinforcing steel is carried out whole stretch-draw, mud jacking and sealing off and covering anchorage.
Transversely strengthening construction method the most according to claim 1, it is characterised in that step 2) in, the bore diameter of employing
For 40mm, after having holed, clean up with water in hole.
Transversely strengthening construction method the most according to claim 1, it is characterised in that in step 3), will when using anchoring to wrap
Anchoring bag sealing end uprightly soaks in water, and soak time is as the criterion with not effervescent, is rapidly inserted into the steel that need to anchor after filling up boring
Muscle, fastening floating aperture.
Transversely strengthening construction method the most according to claim 1, it is characterised in that in step 3), the tool of anchoring adhesive anchoring
Body method is: carry out pre-note initially with the special filling gun of bar planting and combining nozzle, is inserted by combining nozzle and starts injecting glue at the bottom of hole,
Slowly will move outside combining nozzle while injecting glue, it is ensured that bubble-free or hole in hole, injecting glue is to filling up about the 2/3 of hole depth by continuously
The mode rotated implants reinforcing bar until colloid flows out, and cured.
Transversely strengthening construction method the most according to claim 1, it is characterised in that in step 4), presstressed reinforcing steel initial tensioning
Order is: two of first simultaneous tension span centre section, then two of simultaneous tension beam-ends section.
Transversely strengthening construction method the most according to claim 1, it is characterised in that in step 6), the condition of whole stretch-draw is:
After lateral connection is reached the 95% of design strength by concrete strength, elastic modelling quantity, carrying out whole stretch-draw, tension sequence is: pretensioning
Away from nearest two sections of span centre, then order other sections of stretch-draw.
Transversely strengthening construction method the most according to claim 1, it is characterised in that in step 6), to presstressed reinforcing steel termination
During sealing off and covering anchorage, using pea gravel concreten sealing off and covering anchorage, sealing off and covering anchorage top of concrete is straight and even smooth, with existed concrete bridge binding site brushing 2～3
Road water-repellent paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610760281.XA CN106320189A (en) | 2016-08-30 | 2016-08-30 | Transverse reinforcing construction method of existing railway line T beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610760281.XA CN106320189A (en) | 2016-08-30 | 2016-08-30 | Transverse reinforcing construction method of existing railway line T beam |
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| Publication Number | Publication Date |
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| CN106320189A true CN106320189A (en) | 2017-01-11 |
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| CN201610760281.XA Pending CN106320189A (en) | 2016-08-30 | 2016-08-30 | Transverse reinforcing construction method of existing railway line T beam |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109972535A (en) * | 2018-12-14 | 2019-07-05 | 中铁科学研究院有限公司 | Railway Simple T-Girders transverse prestress reinforcement means |
| CN110777860A (en) * | 2019-11-04 | 2020-02-11 | 中铁十二局集团第二工程有限公司 | Method for grouting and plugging back of side wall leakage water of subway station |
| CN114808765A (en) * | 2022-05-09 | 2022-07-29 | 中铁城建集团第三工程有限公司 | Construction method for transversely reinforcing existing railway bridge simply-supported double T-shaped beams |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109972535A (en) * | 2018-12-14 | 2019-07-05 | 中铁科学研究院有限公司 | Railway Simple T-Girders transverse prestress reinforcement means |
| CN110777860A (en) * | 2019-11-04 | 2020-02-11 | 中铁十二局集团第二工程有限公司 | Method for grouting and plugging back of side wall leakage water of subway station |
| CN114808765A (en) * | 2022-05-09 | 2022-07-29 | 中铁城建集团第三工程有限公司 | Construction method for transversely reinforcing existing railway bridge simply-supported double T-shaped beams |
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Application publication date: 20170111 |