CN205531011U - A a multilayer string girder construction that is used for striding greatly, super large is striden - Google Patents

Abstract

The utility model discloses a multi-layer tension string beam structure for large spans and ultra-large spans, comprising upper string beams, lower string cables and struts. The struts are connected between the upper chord beam and the lower chord cable, and the two ends of the lower chord cable in the lowermost layer are correspondingly connected with the two ends of the upper chord beam; The sag of the bottom string is smaller than that of the string beam structure with only one layer of bottom string. The utility model optimizes one layer of lower strings to double-layer or multi-layer lower strings, so that the middle part of the lower strings changes from drooping to horizontal, the sag is reduced, and the net height of the space is increased, which effectively improves the space utilization rate; in addition, the multi-layer lower strings are adopted The cable structure can decompose the horizontal tensile force into each lower string, so that the tension in each lower string is reduced, effectively improving the safety performance of the structure.

Description

A Multi-layer Tension String Beam Structure for Large and Super Large Spans

technical field

The utility model relates to a string string structure, in particular to a multi-layer string string structure for large spans and super large spans.

Background technique

The existing string beams include a pair of upper string beams and a pair of lower string cables. The upper string beams and the lower string cables are fixedly connected by several pairs of braces. The paired upper string beams, paired brace rods and paired The lower strings are symmetrically arranged on both sides of the symmetrical plane, and the upper strings, struts and lower strings on the same side of the symmetrical plane form a surface structure; in the same surface structure, the two lower strings The ends are respectively fixed to the two ends of the upper string, the upper end of the strut is connected to the upper string, and the lower end of the strut is fixedly connected to the lower string; the upper string, the strut and the lower string form a self-balancing system.

It is generally believed that the stress mechanism of the tension beam structure is as follows: the prestress of the lower string causes the upper string to produce back deflection, and the final deflection of the upper string under the load will decrease, and the tension of the lower string will cause the strut to produce an upward deflection. force, causing the upper string beam to produce internal force and deformation opposite to the external load to form the entire string beam structure and improve structural rigidity. The struts provide elastic support for the upper string beam and improve the mechanical performance of the upper string beam; generally the upper string beam adopts arch beams Or truss arch, under the load, the horizontal thrust of the arch is borne by the lower string cable, which reduces the burden on the support of the arch and reduces the horizontal displacement of the sliding support. It can be seen that the string beam structure can give full play to the strong tensile performance of the lower string, which is beneficial to improve the mechanical performance of the overall structure, so that the bending rigid members of the upper string and the tensile members of the lower string can learn from each other and work together to achieve self-balancing and give full play to The role of each structural material.

The above-mentioned tension beam structure has been widely used in the field of civil engineering, and the long-span structure has also become an important part of modern architecture. Among them, the tension beam structure is applied to this kind of long-span structure, but when the rise-span ratio of the tension beam is constant, due to the large span, the sag of the lower string cable will also be large, so that the net height of the long-span space structure is reduced, and the space It is not fully utilized, and the tension on the lower string is very high, so the material requirements are very high.

Utility model content

The purpose of the utility model is to solve the above-mentioned technical problems and provide a multi-layer tension string beam structure for large spans and super large spans.

In order to achieve the above object, the technical scheme adopted by the utility model is as follows:

A multi-layer tension beam structure for large spans and ultra-large spans, including upper strings, lower strings and struts, wherein the lower strings have at least two layers and are arranged at different heights of the bows of the upper strings, and the struts Connected between the upper string beam and the lower string cable, the two ends of the lower string string are correspondingly connected with the two ends of the upper string beam;

When the rise-to-span ratio is constant and the span is the same, the sag of the bottom string at the lower layer is smaller than that of the string beam structure with only one layer of bottom string.

The utility model optimizes the string beam structure with only one layer of bottom strings into a string beam structure with two or more layers of bottom strings. The overlapping spans of the lower chord cables on the upper layer do not need to bear load, and the sag can be appropriately reduced, so that the net height of the space is increased and the space utilization rate is improved; in addition, the multi-layer lower chord cable structure can be used to decompose the horizontal tension into each lower chord In the cable, the tension in each lower string is reduced, which effectively improves the safety performance of the structure.

In order to further increase the clear height of the space and improve the utilization rate of the space, the overlapping part of the span of the lower string on the lower string and the upper layer of the lower string is horizontal.

Preferably: the lower strings of each layer are arranged sequentially from top to bottom, and the spans thereof increase sequentially from top to bottom.

Preferably: the lower chords are left-right symmetrical, the lower chords at the uppermost layer are connected to the upper chord beams through struts, and the left and right sides of the lower chords beyond the span overlap of the lower chords at the upper layer are connected to the upper chord beams connected by struts.

Preferably: a strut is provided at the connection between the lower string on the upper layer and the upper string to connect to the lower string on the lower layer.

The beneficial effects of the utility model:

(1) Optimize one layer of lower strings to double or multi-layer lower strings, so that the middle of the lower strings in the lower layer changes from drooping to horizontal. Compared with the string beam structure with single layer of lower strings, it can effectively reduce the sag and increase the Large space net height, improve space utilization.

(2) The tension beam with multi-layer lower strings is designed to decompose the horizontal tension into each lower string through the design of the force transmission path, so that the tension in each lower string is reduced, and the safety performance of the structure is effectively improved.

Description of drawings

Fig. 1 is a schematic diagram of a traditional tension beam structure.

Fig. 2 is a structural schematic diagram of the multi-layer string string structure described in the present invention.

Fig. 3 is another structural schematic diagram of the multi-layer string string structure described in the present invention.

detailed description

Fig. 1 has shown the schematic diagram of existing tension beam structure, and existing tension beam comprises upper string beam 1, lower string cable 2, as can be seen from Fig. The two ends of the upper string 1 are fixed, the upper end of the strut 5 is connected with the upper string 1, the lower end of the strut 5 is fixedly connected with the lower string 2, and the lower string sags greatly.

In conjunction with Fig. 2, the multi-layer tension beam structure for large spans and super-large spans described in the present utility model is further described. Rod 5; wherein the lower chord has two layers, which are arranged at different heights of the bow of the upper chord 1, including the lower chord 3 on the upper layer and the lower chord 4 on the lower layer, the upper chord 1 and the lower chord 3 are connected by struts 5, and the left and right sides of the lower chord 4 beyond the span overlap of the upper chord 3 are connected with the upper chord 1 through the strut 5, and the two ends of the lower chord 4 at the bottom are connected to the upper chord beam 1. The two ends of the upper string 1 are connected correspondingly; as can be seen from Figure 2, when the rise-to-span ratio is constant and the span is the same, the sag of the lower string 4 at the lower layer is lower than that of the string beam structure with only one layer of lower string Small.

In order to further increase the clear height of the space and improve the utilization rate of the space, the overlapping spans of the lower string cables 4 on the lower layer and the lower string cables 3 on the upper layer are horizontal, as shown in FIG. 2 . In order to further strengthen the stability of the structure, struts 5 are provided at the connection between the lower strings 3 on the upper layer and the upper strings 1 to connect with the lower strings 4 on the lower layer.

The lower strings can also be designed to have more than 2 layers. As shown in Figure 3, the lower strings have 3 layers. It is left-right symmetrical, and the bottom string located on the uppermost layer is connected to the upper string beam through a strut, and the left and right sides of the bottom string cable of the lower layer beyond the span overlapping with the upper string string are connected to the upper string beam through a strut.

Claims (5)

1. one kind for greatly across, the multilamellar tension string beam structure of super-span, including the beam that winds up, last quarter rope and strut, it is characterized in that: described in the beam bow portion differing heights that winds up be provided with at least two-layer last quarter rope, described strut winds up between beam and described last quarter rope described in being connected to, and undermost last quarter rope two ends are corresponding with the two ends of the described beam that winds up to be connected；

Certain in ratio of rise to span, when footpath is identical, the sag of the last quarter rope being positioned at lower floor is little compared with the sag of the only tension string beam structure of one layer of last quarter rope.

It is the most according to claim 1 for greatly across, the multilamellar tension string beam structure of super-span, it is characterised in that: horizontal with the last quarter rope span overlapping being positioned at its upper strata on described last quarter rope.

It is the most according to claim 2 for greatly across, the multilamellar tension string beam structure of super-span, it is characterised in that: each layer last quarter rope sets gradually from top to bottom, and it increases the most successively across footpath.

The most according to claim 3 for greatly across, the multilamellar tension string beam structure of super-span, it is characterized in that: described last quarter rope is symmetrical, the last quarter rope being positioned at the superiors is connected by strut with the described beam that winds up, overlapping with the last quarter rope span being positioned at its upper strata outside the left and right sides of lower floor's last quarter rope be connected by strut with the described beam that winds up.

It is the most according to claim 4 for greatly across, the multilamellar tension string beam structure of super-span, it is characterised in that: the last quarter rope being positioned at upper strata is provided with strut, to be connected with the last quarter rope being positioned at its lower floor with described beam junction of winding up.