Utility model content
The purpose of this utility model is to provide one to set up prestressed concrete plate ruggedized construction, back-up coat is applied to prestressing force by setting up prestressed concrete plate reinforcing technique, make back-up coat in pressured state, intensity, rigidity and the crack resistance of structure are improved, guarantee the durability of structure, can give full play to concrete anti-pressure ability, therefore there is more excellent mechanics condition.
To achieve these goals, the technical solution of the utility model is as follows.
One is set up prestressed concrete plate ruggedized construction, comprises T beam, is provided with prestressed concrete plate at T beam lower edge, is provided with prestress wire in prestressed concrete plate; T beam is vertically installed with diaphragm reinforcing rib; In diaphragm reinforcing rib, on inner side, be fixedly installed anchor pole fixed end; Prestress wire is connected with anchor pole fixed end through the steering block that is arranged on prestressed concrete plate end positions.
Further, the main muscle rigid connection of T beam cross section, cross section is box-type section.
In this utility model device, by multi-disc, T-shaped or π type beam sheet forms the T-shaped or π type beam bridge of freely-supported, between adjacent two girders, form the type of opening, cross section conversion reinforced steel concrete T(or π) type beam bridge technology is by the intermarginal reinforced concrete floor of setting up under adjacent two girders, makes original opening section convert the box section of sealing to.After adopting the technology to reinforce, under live loading, bridge span structure will be case beam stress form by former T-shaped beam stress Morphological Transitions.
Set up prestressed reinforced concrete base plate at former T beam lower edge, by the rigid connection of base plate and the main muscle of T beam lower edge, cross section converts box-type section to, reaches the stressed object of bridge total cross-section under live loading.Its implementing process is as follows: the former beam lower edge of strip off concrete expose main muscle → increasing weldering horizontal bar on the main muscle of two adjacent former beam lower edges → set up lengthways main steel bar, and and horizontal bar intersection adopt without exception concrete between spot welding → removing burn, loose concrete → shut die plate Cast-in-situ Beam, reserving hole channel → very heavy topmast on concrete component, prestressed reinforcement of tensioning → with ground tackle will after prestressed reinforcement anchoring, carry out hole path pressure grouting → formation sealing box girder construction.
After RC T (or π) type beam bridge adopts cross section switch technology to reinforce, former bridge will improve mechanical characteristic aspect following 5:
1) bending rigidity increases: girder lower edge tensile region is set up after plain bars and prestressed reinforcement, not only the tensile region area of reinforcement own increases, and along with the moving down of girder neutral axis, pressure zone concrete bearing area is increased, thereby improve the bending rigidity of bridge.
2) torsional rigidity significantly increases: seal into after box beam, bridge will be adjusted former Transverse Distribution, improve bridge force-bearing characteristic, improves the ultimate bearing capacity of bridge.
3) apply prestressing force and concrete can be become to elastomeric material: the object of prestressing is just in order to change concrete performance, and change fragile material is elastomeric material.This conception of species thinks that prestressed concrete and ordinary reinforced concrete are two kinds of diverse materials, and the effect of prestressed reinforcement is not arrangement of reinforcement but applies compressive pre-stress to change a kind of means of concrete performance.If compressive pre-stress is greater than the tensile stress that load produces, concrete does not just bear tensile stress.
4) applying prestressing force can co-operation by high strength cast iron and concrete: a kind of special steel concrete of prestressed concrete being regarded as to high tensile reinforcement and concrete bi-material composition.In advance by prestressed reinforcement stretch-draw to certain stress state, the amplitude increasing at the stress (strain) of operational phase prestressed reinforcement is less, concrete do not ftracture or crack thinner, high tensile reinforcement just can normally be worked together with concrete like this.
5) apply prestressing force and can realize load equilibrium: prestressing can think concrete component to apply in advance the load contrary with service load to offset part or all of working load, make flexural member (as plate, beam and girder) under given loading condition, not be subject to flexural stress.This just can convert a member that is subject to axial force, the design of simplified structure and calculating greatly to a deflection component.Adjust the relation of prestressing force and external load by the concept of load equilibrium, clear concept, calculates simple.Apply this concept, require to replace the effect of prestressed reinforcement along span take concrete as chorista and by some power.
The beneficial effect of this utility model is: Box section beam is compared with T-shaped beam, has following three advantages: (1) has larger bending resistance and torsional property, has the mechanics condition better than T beam; (2) there is good dynamic characteristics; (3) there is larger area base plate, be convenient to cloth muscle; (4) larger than adopting ordinary reinforced concrete plated construction rigidity, increase opposing mobile load ability, cracking resistance is better, durable in use.Thereby, by setting up prestressed concrete plate T(π) tee section convert to case beam reinforcing strengthen structure have broad application prospects.In this utility model device, the prestressed reinforced concrete base plate of newly establishing can with former T beam compatible deformation, shared mobile load.The raising of girder integral rigidity after reinforcing, spaning middle section amount of deflection reduces 30%～70% before reinforcing, and spaning middle section strain reduces 30%～60% before reinforcing, and the mechanics condition of girder has obtained improvement by a relatively large margin.T-shaped beam seals into after box beam through reinforcing the conversion of enhancing cross section, and its torsional rigidity can improve more than 12 times.T beam is reinforced and is converted to after case beam, and its ultimate bearing capacity increase rate value reaches 40%～65%.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described, to better understand the utility model.
As shown in Figure 1 set up prestressed concrete plate ruggedized construction, comprise T beam, be provided with prestressed concrete plate 5 at T beam lower edge, in prestressed concrete plate 5, be provided with prestress wire 4; T beam is vertically installed with diaphragm reinforcing rib 1; On the interior inner side of diaphragm reinforcing rib 1, be fixedly installed anchor pole fixed end 2; Prestress wire 4 is connected with anchor pole fixed end 2 through the steering block 3 that is arranged on prestressed concrete plate 5 end positions.
As shown in Figure 2, the main muscle rigid connection of T beam cross section, cross section is box-type section.
The above-mentioned prestressed concrete plate reinforcing construction process process of setting up is:
(1) cut the concrete cover of the main muscle in beam lower edge side by calculated height: before clear cutter lower edge side and bottom surface portions concrete; Ying Liang rib cutter is beaten in scope snap the line in order to rear construction corps, neatly cuts side and bottom surface concrete extremely till exposed former vertical muscle diameter half.
(2) increase horizontal bar in welding steel foundation board: require fusion length to meet code requirement and weld seam is full, all weldering shells that adheres to should thoroughly knock out; In electric welding operating process, should avoid the concrete part to not cutting to produce excessive burning as far as possible, when emergent for the part of burning, remove.
(3) hang on muscle and lay and increase main muscle at base plate, after main reinforce position is adjusted to the right place, muscle breach is hung in sealing.
(4) increase the horizontal bar of weldering perpendicular to main muscle direction, horizontal bar and main muscle junction are carried out spot welding every certain position and are formed steel grid;
(5) injection or cast-in-situ concrete are until at the bottom of forming the case flushing with former beam lower edge, reserve prestressed pore passage.The rubble using in sprayed mortar, its maximum particle diameter is no more than 2cm and has good grating, and in course of injection, the concrete of resilience loss is forbidden to use in upper once sprayed construction; Concrete curing it should be noted that the time limit is no less than 7 days especially.
(6) very heavy topmast is on concrete component, prestressed reinforcement of tensioning.
(7) with ground tackle by carrying out hole path pressure grouting after prestressed reinforcement anchoring, then carry out anchoring processing, form sealing box girder construction.
The above is preferred embodiment of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection domain of the present utility model.