CN101550684B - Two-stage unsupported construction method used for repairing damaged hydraulic concrete beams - Google Patents
Two-stage unsupported construction method used for repairing damaged hydraulic concrete beams Download PDFInfo
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- CN101550684B CN101550684B CN2009100312604A CN200910031260A CN101550684B CN 101550684 B CN101550684 B CN 101550684B CN 2009100312604 A CN2009100312604 A CN 2009100312604A CN 200910031260 A CN200910031260 A CN 200910031260A CN 101550684 B CN101550684 B CN 101550684B
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Abstract
The invention relates to a two-stage unsupported construction method used for repairing damaged hydraulic concrete beams, belonging to the technical field of civil engineering. The construction methodcomprises the following steps: a node slot hole is manufactured at the lower part of a beam base body; the two sides of the node slot hole of the beam base body are respectively provided with a pulling rod steel bar; a node member is poured at the node slot hole position; concrete which is corroded and damaged at the bottom part of the beam base body is chiseled off; the steel bars which are corroded seriously at the bottom part of the beam base body are removed and loosened and laminated parts are eliminated; the two sides of the bottom part of the beam base body are respectively provided with additional steel bars; and a concrete protective layer with the concave-shaped section is poured at the bottom part of the beam base body and covers the additional steel bars, the pulling rod steelbar and the node member which are built into a whole body with the beam base body. The construction method bears construction period load applied to the beam body by damaged concrete beams and a pulling rod system, and saves external supports. After the construction is completed, the pulling rod steel bar becomes a main stressed bar of the concrete beam, thus realizing that one object has two purposes, solving the difficulties on repairing the hydrostructure, and also greatly saving the engineering cost.
Description
Technical field
Two stages that the present invention relates to the reparation of a kind of disease concrete beam exempt to support to execute to build worker's method, are particularly useful for the reparation of disease hydro-structure, belong to technical field of civil engineering.
Background technology
Understand according to the applicant; the reparation of the structural failure that reinforcement corrosion causes in the concrete has become the large-engineering difficult problem in the worldwide; and the damaged disease of concrete for hydraulic structure building corrosion is especially serious; reinforcement corrosion, concrete cover cracking dew muscle occur as building hydro-structures such as harbour, sluice, tide-block sluice, jeopardize engineering safety.The damaged concrete for hydraulic structure structure of at present existing macro-corrosion faces repairs and handling problems.
Facts have proved that the corrosion breakage of concrete for hydraulic structure structure central sill is mainly the corrosion of bottom tension master muscle, topping spalling.A difficult problem that faces in the reparation is to reveal the main muscle of corrosion to its rust cleaning or when changing when maintenance cutter, and concrete beam will be deactivated and can not bear the load on top owing to tension master muscle, even can not bear the weight of self.And adopt to support from the outside, then because restrictions such as the residing engineering-environment of hydro-structure and site condition, structural apparatus arrangement are difficult to implement maintenance even can't carry out.Just because of this reason, have to usually the especially simply supported beam dismounting replacing of concrete beam of bottom heavy corrosion breakage.
Summary of the invention
The objective of the invention is to: two stages that propose a kind of fine embodiment reliability and economy exempt to support to execute to build worker's method, are used to repair disease concrete for hydraulic structure beam, thereby solve the reparation difficult problem of the damaged hydro-structure of corrosion.
In order to reach above purpose, two stages that the present invention is used to repair disease concrete for hydraulic structure beam exempt to support to execute and build worker's method and comprise the steps:
The first step, make the node slotted eye along its length at a certain distance at the beam matrix underpart;
Second goes on foot, is provided with in beam matrix node slotted eye both sides the pull bar reinforcing bar that extends along beam matrix length direction;
The 3rd goes on foot, builds at node slotted eye place the node component that the cross section becomes dumbbell shaped, and the node slotted eye is passed at the middle part, cross section of described node component, and two ends are for being close to the rectangular block that beam matrix side and described pull bar reinforcing bar therefrom pass respectively;
The 4th goes on foot, treats that the node component maintenance after the length of time, chisels out corrosion damaged concrete in beam matrix bottom to regulation;
The reinforcing bar of the 5th step, removal beam matrix bottom heavy corrosion, and reject loosening, the slabbing part in beam matrix bottom;
The 6th step, prolong the setting of beam matrix length direction in beam matrix two bottom sides and recruit reinforcing bar;
The 7th step, build the concrete cover that the cross section is " recessed " font, will recruit reinforcing bar, pull bar reinforcing bar and node component and together contain wherein, build up integral body with the beam matrix in beam matrix bottom.
Above-mentioned worker's method forms through macromethod and experiment in the long-term work practice, implements in fact in two stages: the phase I, the pull bar system is set, and bear the construction period load with damaged concrete beam+pull bar system; After the length of time, the bottom corrosion of maintenance beam matrix is damaged to regulation for second stage, the node component maintenance for the treatment of the pull bar system, and will recruit reinforcing bar, pull bar reinforcing bar and node component and the beam matrix builds up integral body by the topping concrete.
When adopting above-mentioned worker's method to repair the concrete beam of heavy corrosion breakage, bear the construction period load that acts on the beam body, removed external bracing from original damaged concrete beam+pull bar system.After construction was finished, the pull bar reinforcing bar became the muscle of being advocated of concrete beam, a thing dual-purpose.Manufacture process is carried out in the engineering original position, saved that common new, old beam body dismounts and mounts and process equipment such as dismounts and mounts at process, therefore save construction costs significantly, and embodied the theory of energy-conserving and environment-protective, thereby solved the reparation difficult problem of concrete for hydraulic structure structure preferably.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of one embodiment of the invention phase I after finishing.
Fig. 2 is the A-A cross section structure schematic diagram of Fig. 1.
Fig. 3 is the B-B cross section structure schematic diagram of Fig. 1.
Structural representation after Fig. 4 Fig. 1 embodiment of the present invention second stage is finished.
Fig. 5 is the A-A cross section structure schematic diagram of Fig. 4.
Fig. 6 is the B-B cross section structure schematic diagram of Fig. 4.
The specific embodiment
Embodiment one
Present embodiment is an example with the longeron that reparation is positioned at the coastal sea port dock access bridge in somewhere, this access bridge length 147m, and width 7m adopts pile foundation beam and slab type structure.Full-bridge is 11 spannings of totally 12 framed bents, adopts concrete freely-supported longeron in 10 spannings wherein.3 of every spannings amount to 30 simply supported beams, beam span 14m.As the access bridge of an oil jetty, tens of petroleum pipelines and other pipelines have been arranged on the bridge.Feel and detect through the scene, 30 main muscle general corrosions in beam bottom, the concrete cover explosion, reinforcing bar cross section corrosion loss rate reaches about 25%, and the serious threat engineering safety must keep in repair disposal immediately.
When scheme discuss, once analyzed some schemes of relatively crossing:
(1) more renew longeron: with the complete removals such as process pipelines on longeron, bridge deck and the bridge floor, prefabricated then installation longeron, bridge deck are reinstalled pipeline and other process equipments on the bridge floor at last.About 4,800,000 yuan of this schematic design estimate expense.
(2) pasting longeron and building the alternative former longeron of a new beam again: according to this scheme construction, will increase the load of crossbeam and pile foundation, and form the overload of pile foundation and crossbeam, so this scheme is being by negative.
(3) keep in repair from the bridge floor upper support: remove pipeline and other process equipments on the bridge floor, make on bridge floor and support, the maintenance longeron recovers pipeline and other process equipments on the bridge floor, about 3,500,000 yuan of this schematic design estimate expense at last.
(4) two stages of adopting exempt to support to execute to build the reparation of worker's method: the reinforcement fabrication pull bar system with 8 diameter 25mm, on every beam, be provided with 8 nodes, and this scheme project estimate is 43.5 ten thousand yuan, thereby this scheme becomes the best approach and adopted at last.
Two stages of being repaired disease concrete for hydraulic structure beam by being used to of being adopted exempt to support and execute that to build worker's method concrete steps as follows:
Phase I (referring to Fig. 1 to Fig. 3)
The first step, make node slotted eye 2 along its length at a certain distance in beam matrix 1 bottom, this node slotted eye is made of the circular hole adjacent one another are and that be communicated with of (being advisable for three or four) more than two, and the size of node slotted eye and spacing can be determined by stressed needs;
Second step, four of extending along beam matrix length direction are set in beam matrix node slotted eye both sides are the pull bar reinforcing bars 4 that square shape distributes, in the node slotted eye, need to install anchoring and structure stirrup by stressed;
The 3rd step, make depression at node slotted eye two ends, build the node component 3 that the cross section becomes dumbbell shaped, node slotted eye 2 is passed at the middle part, cross section of this node component, caves in and be close to the beam matrix for being absorbed in respectively in two ends, and the rectangular block that therefrom passes of pull bar reinforcing bar 4;
Second stage (referring to Fig. 4 to Fig. 6)
The 4th goes on foot, treats that node component 3 maintenances after the length of time, chisel out corrosion damaged concrete 6 in beam matrix 1 bottom to regulation;
The reinforcing bar 7 of the 5th step, removal beam matrix 1 bottom heavy corrosion, and reject loosening, the slabbing part in beam matrix bottom;
The 6th step, prolong the setting of beam matrix length direction in beam matrix 1 two bottom sides and recruit reinforcing bar 8;
The 7th the step, build the concrete cover 9 that the cross section is " recessed " font in beam matrix 1 bottom, will recruit reinforcing bar 8, pull bar reinforcing bar 4 and node component 3 and together contain wherein, build up integral body with beam matrix 1.
As depicted in figs. 1 and 2, the bottom of rectangular cross section beam matrix 1 is provided with the node slotted eye 2 that distributes at a certain distance along its length, each node slotted eye and circular hole that be communicated with adjacent one another are by (three or four) more than two constitutes, and each node slotted eye place builds the node component 3 that the cross section is a dumbbell shaped.As seen from Figure 2, the node slotted eye is passed at middle part, the cross section of node component 3, and two ends are for being close to the rectangular block of beam matrix two sides respectively.Be connected by four pull bar muscle 4 (reinforcing bar) between the homonymy rectangular block of each node component.The following beam matrix of node component is included in the cross section in the concrete cover 5 of " recessed " font.Build the reinforcing rib 6 (reinforcing bar) that extends along beam matrix length direction in the topping.
Facts have proved that present embodiment has following remarkable advantage:
The first, can utilize the available part of damaged beam body to greatest extent, significantly reduce the waste of high energy consumption high pollution materials such as cement, steel, embody the principle of energy-conserving and environment-protective;
The second, the pull bar muscle both can play the effect of carrying pull bar before building topping, can be used as the muscle of being advocated of concrete beam afterwards again, a thing dual-purpose, thus can reduce cost significantly.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (4)
1. two stages that are used to repair disease concrete for hydraulic structure beam exempt to support to execute to build worker's method, comprise the steps:
The first step, make the node slotted eye along its length at a certain distance at the beam matrix underpart;
Second goes on foot, is provided with in beam matrix node slotted eye both sides the pull bar reinforcing bar that extends along beam matrix length direction;
The 3rd goes on foot, builds at node slotted eye place the node component that the cross section becomes dumbbell shaped, and the node slotted eye is passed at the middle part, cross section of described node component, and two ends are for being close to the rectangular block that beam matrix side and described pull bar reinforcing bar therefrom pass respectively;
The 4th goes on foot, treats that the node component maintenance after the length of time, chisels out corrosion damaged concrete in beam matrix bottom to regulation;
The reinforcing bar of the 5th step, removal beam matrix bottom heavy corrosion, and reject loosening, the slabbing part in beam matrix bottom;
The 6th step, prolong the setting of beam matrix length direction in beam matrix two bottom sides and recruit reinforcing bar;
The 7th step, build the concrete cover that the cross section is " recessed " font, will recruit reinforcing bar, pull bar reinforcing bar and node component and together contain wherein, build up integral body with the beam matrix in beam matrix bottom.
2. two stages that are used to repair disease concrete for hydraulic structure beam according to claim 1 exempt to support to execute to build worker's method, it is characterized in that: described node slotted eye is made of circular hole adjacent one another are more than two and that be communicated with.
3. two stages that are used to repair disease concrete for hydraulic structure beam according to claim 2 exempt to support to execute to build worker's method, and it is characterized in that: depression is made at described node slotted eye two ends, and the two ends of described node component are absorbed in depression respectively and are close to the beam matrix.
4. two stages that are used to repair disease concrete for hydraulic structure beam according to claim 3 exempt to support to execute to build worker's method, and it is characterized in that: the pull bar reinforcing bar of described beam matrix both sides has four respectively, are square shape and distribute.
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| CN2009100312604A CN101550684B (en) | 2009-04-28 | 2009-04-28 | Two-stage unsupported construction method used for repairing damaged hydraulic concrete beams |
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| CN2009100312604A CN101550684B (en) | 2009-04-28 | 2009-04-28 | Two-stage unsupported construction method used for repairing damaged hydraulic concrete beams |
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| CN101550684B true CN101550684B (en) | 2010-08-04 |
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Owner name: NANJING R+D CONSTRUCTION TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: NANJING WATER CONSERRANCY SCIENCE INST., MINISTRY OF WATER RESOURCES, MINISTRY O Effective date: 20131024 |
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Effective date of registration: 20131024 Address after: 210029 No. 225, Guangzhou Road, Gulou District, Jiangsu, Nanjing Patentee after: Nanjing R & D Tech Group Co., Ltd. Address before: 210024 No. 223, Guangzhou Road, Nanjing, Jiangsu Patentee before: Nanjing Hydraulic Research Institue, the Ministryof Water Resources, the Ministry Of Communications |