CN2649640Y - Wide hollow board - Google Patents

Abstract

The utility model discloses a wide hollow plate for bridge construction. Width of the plate is 1.40 to 1.55m, and the plan of pre-stress bottom plate and rope is used. The plate is wide, and has small dead weight, good force-bearing effect and obvious economical performance.

Description

The wide cut hollowcore slab

Technical field

The utility model relates to a kind of bridge construction material, particularly a kind of wide cut hollowcore slab that is applicable to bridge superstructure.

Background technology

The hollowcore slab that the tradition bridge superstructure adopts is the bridge construction hollowcore slab standard drawing of promulgated by the ministries or commissions of the Central Government of national communication, and structure is a prestressed reinforced concrete structure, comprises reinforcing bar, concrete, steel strand and ground tackle, and its width is 1m to 1.25m.But this hollowcore slab plate is wide narrower, and it is little that section hollows out rate, and must be furnished with perpendicular curved prestress wire, and the hollowcore slab concrete of Zhi Zaoing and the large usage quantity of steel strand are less economical like this.

Figure 1A, Figure 1B has shown the cross dimensions of striding footpath 20m hollowcore slab in the standard drawing that national communication portion formulates and has joined the rope scheme, the designer is owing to estimate excessive to the end web main stress bar, thereby adopted the square ground tackle of 15-7 type, and adopted web rope scheme, because beam-ends all need be laid 2 15-7 type ground tackles up and down, taken very big bearing area like this, making it hollow out rate only is 39.4%.At span centre, steel strand distance of centre of gravity centroid of section only is 28.98cm apart from also less than normal.

Because there is following problem in prior art: the rate that at first hollows out is little, and correspondingly cement consumption is big; Next has adopted the web rope, and the consumption of steel strand is big, also has because the weight of hollowcore slab is big, so the engineering quantity of substructure and bearing tonnage are bigger.Therefore, press in practice that to hollow out area big, the lighter hollowcore slab that the steel strand consumption is little.

Summary of the invention

The technical problems to be solved in the utility model will provide a kind of exactly can save steel strand and concrete wide cut hollowcore slab.And the width of control hollowcore slab can guarantee under any circumstance it, only is subjected to the effect of a wheel on plate.

In order to achieve the above object, content of the present utility model is:

1. a bridge construction wide cut hollowcore slab comprises reinforcing bar, concrete, steel strand, it is characterized in that: the plate of this plate is wide to be 1.40-1.55m, and adopts prestress baseboard to join the rope scheme, and the rate of hollowing out is 50-65%.

2. according to 1 described wide cut hollowcore slab, it is characterized in that: the perpendicular distance of steel strand distance of centre of gravity centroid of section is 35-45cm.

1.40-1.55m is wide for the wide employing of plate of the present utility model, and the wheel horizontal spacing of national regulation is 1.8m, and the wide between-wheel spacing that is slightly smaller than of plate has equally also guaranteed under any circumstance, a plate only acts on a wheel, thereby guaranteed the load of the rated range on every block of plate.

In addition, the utility model adopts the prestressed reinforced concrete construction base plate to join the rope scheme, that is to say and does not lay web rope (shown in Fig. 2 A); With the wide 1.40-155cm that is increased to of plate; Top, base plate and web size are kept the size (as Fig. 1 b) of existing hollowcore slab substantially; The rate of hollowing out reaches as high as 65%, if the rate that hollows out is higher than this value, then the supporting capacity of hollowcore slab will can not get guaranteeing.The perpendicular distance of steel strand distance of centre of gravity section center of gravity is 35-45cm.It is 40-49% that scheme of the present utility model is saved steel strand.

In practice, compare with the hollowcore slab of prior art, wide cut hollowcore slab of the present utility model has following effect under the constant situation of safety factor:

Concrete consumption significantly reduces;

Since the superstructure hollowcore slab light 35-40%, the engineering quantity of respective lower structure and the tonnage of bearing can correspondingly reduce;

Owing to adopted base plate to join the rope scheme, saved steel strand quantity, and the maximum principal tensile stress of web 0.8Mpa only, much smaller than the standard permissible value;

The perpendicular distance of steel strand distance of centre of gravity section center of gravity increases, and the bending resistance of hollowcore slab is strong, thereby increases the supporting capacity of hollowcore slab.

Description of drawings

Figure 1A is the steel strand elevation of traditional hollowcore slab structure

Figure 1B is the traditional hollowcore slab structure sectional drawing along I-I and II-II, and wherein the dotted line left side is the I-I section, and dotted line the right is the section of II-II.

Fig. 2 A is the steel strand elevation of hollowcore slab structure of the present utility model

Fig. 2 B is the sectional drawing of hollowcore slab structure of the present utility model along I-I

Fig. 3 is prior art and bridge design section comparison diagram of the present utility model, and wherein the dotted line left side is the bridge design section of prior art, and the dotted line right side is a bridge design section of the present utility model.

The specific embodiment

As shown in Figure 3, utilize certain bridge of wide cut hollowcore slab of the present utility model, design load is a vapour-surpass 20, hangs 120, strides the footpath and partly adopts the wide wide cut hollowcore slab of 1.55m plate for 20m and 30m.The hollowcore slab material therefor comprises: concrete, C50 standard; Reinforcing bar, standard are the I level; Steel strand, ultimate strength are 1860Mpa.Prepared 20m strides the plate base plate in footpath, and to join rope (steel strand) be 13, what 30m strode the footpath is 16, the size that hollows out is 12cm apart from the hollowcore slab upper and lower, left and right, the rate of hollowing out is 62.7%, the weight that the 20m that makes strides the wide hollowcore slab of footpath 1.25m is 29.6 tons, and the weight that 30m strides the wide hollowcore slab of footpath 1.25m is 54.4 tons.The perpendicular distance of steel strand distance of centre of gravity section center of gravity is about 41cm.And being about 38 tons by the weight that the 20m of prior art manufacturing strides the hollowcore slab in footpath, the weight that 30m strides the hollowcore slab in footpath is about 76.0 tons.Steel strand distance of centre of gravity centroid of section distance is 28cm only.

Compared with prior art, the above-mentioned effect of utilizing hollowcore slab of the present utility model to reach is as follows: hollowcore slab plate quantity reduces 30%, makes the concrete amount of hollowcore slab and saves 35%; It is about 33% that dead load alleviates, the engineering quantity of respective lower structure reduced 20% and the quantity of bearing reduced 30%; Thereby the perpendicular distance that does not have the web rope but adopted base plate to join rope steel strand distance of centre of gravity section center of gravity has increased 47%, and the bending resistance of hollowcore slab is strengthened greatly, and this also makes the steel strand consumption reduce 45%.

Wide cut hollowcore slab of the present utility model is not limited to the foregoing description.In other bridge construction, can utilize equally.

Claims (2)

1. a bridge construction wide cut hollowcore slab comprises reinforcing bar, concrete, steel strand, it is characterized in that: the plate of this plate is wide to be 1.40-1.55m, and adopts prestress baseboard to join the rope scheme, and the rate of hollowing out is 50-65%.

2. wide cut hollowcore slab according to claim 1 is characterized in that: the perpendicular distance of steel strand distance of centre of gravity centroid of section is 35-45cm.