CN203145325U - Adjustable prestressed stay cable fixed support seat - Google Patents

Abstract

An adjustable prestressed cable fixing support. It includes a pre-embedded backing plate, an inverted T-shaped support, multiple embedded screws, multiple nuts, multiple high-strength bolts, multiple prestressed adjusting nuts, multiple limit nuts, one or two anchors and movable Cable fixing plate. The adjustable prestressed cable fixing support of the utility model can improve the construction speed: there is a cable piercing hole on the inverted T-shaped support, which is convenient for cable tensioning; when the cable force is stretched to the design value, it can Anchor. Once the cable force deviates due to design or construction changes, the internal force of the cable can be adjusted by controlling the rotation direction and pitch of the prestress adjusting nut, which greatly improves the construction efficiency and saves the construction period. High economy: After the building is put into use, once the cable force is abnormal, if the cable is replaced or re-tensioned, the internal force of the cable can be adjusted by controlling the rotation direction and pitch of the prestress adjustment nut, the effect is the same but the economy is more obvious .

Description

An adjustable prestressed cable fixed support

technical field

The utility model belongs to the technical field of prestressed steel structures in building structures, in particular to an adjustable prestressed cable fixing support.

Background technique

With the wide application of large-span space steel structures, prestressed space steel structures have also achieved considerable development due to their characteristics of reasonable force, high rigidity, and light weight, such as the first phase of Pudong International Airport Terminal Building, Guangzhou International Convention and Exhibition Center They all adopt long-span stringed beam roofs, and the VIP hall of Tianjin Museum and Jinan Gymnasium both adopt stringed dome structures. In addition, in bridge reinforcement, the application of external prestressing technology is becoming more and more extensive. In the construction of prestressed structures, the cables are usually set under the main structure and connected with the main structure through struts. After tensioning, the main structure arches to the design shape, and the rods begin to bear force at the same time, which can effectively control the long-span space steel. deformation of the structure. Most of the projects using prestressing technology are long-span, iconic key projects or key parts of the project. Their design and construction are becoming more and more mature. Researchers have also conducted various researches and achieved many beneficial results.

However, due to the application of prestressed space steel structure technology in the past 12 years, prestressed cables will be damaged and slack due to corrosion and fatigue under long-term work. Although the problem of cable force relaxation has been paid attention to by researchers, the common practice is to replace the cables and re-tension them. Because the cables of cable-stayed bridges are affected by the outdoor environment, the corrosion is serious, which affects the appearance and is not conducive to safety. Therefore, cable replacement is more common in Cable-stayed bridge maintenance works. In the case of large-span space steel structures, the pull cables in the indoor environment are protected by external casings, and the corrosion effect is small and controllable. Therefore, whether to replace the cables and re-tension them has not yet been discussed and reached a consensus. It can be used as a reference engineering practice. Application literature is also rare. From the perspective of construction, the site is often closed in advance to rush work, which makes it impossible to fine-tune the cable force through the tension end (Wu Wen, Tang Hui. Design and construction of prestressed cables at the east gate of Zhuhai Free Trade Zone[J]. Zhongwai Architecture, 2002, 4: 70-71) to increase or decrease the cable force to make the design achieve the expected goal, resulting in passive modification of the design, which not only increases the cost, violates the low-carbon and environmental protection design concept of green buildings, but also changes the structure virtually. Static and dynamic design performance, which brings potential hidden dangers to the safe use of the structure.

To sum up, in the design and construction of prestressed space steel structure technology, there are still deficiencies in the problem of cable force relaxation, which needs further discussion and research.

Contents of the invention

In order to solve the above problems, the purpose of this utility model is to provide an adjustable prestressed cable fixing support with higher safety and more convenient operation.

In order to achieve the above purpose, the adjustable prestressed cable fixing support provided by the utility model includes a pre-embedded backing plate, an inverted T-shaped support, a plurality of pre-embedded screws, a plurality of nuts, a plurality of high-strength bolts, a plurality of pre-embedded Stress adjustment nuts, multiple limit nuts, one or two anchors and movable cable fixing plates; wherein the embedded backing plate is arranged on the top surface of the lower support structure in the prestressed space steel structure; the inverted T-shaped support is composed of It consists of a horizontal plate and a vertical plate, in which the horizontal plate is fixed on the surface of the embedded backing plate with multiple embedded screws and nuts, and one or two cable penetration holes are formed in the middle of the vertical plate; the middle of the movable cable fixes the plate One or two cable penetration holes are also formed, which are arranged on the inside of the vertical plate in a manner parallel to the vertical plate; between the vertical plate and the movable cable fixing plate, multiple high-strength bolts, multiple prestressed adjustment nuts and multiple The limit nuts are connected with each other, wherein the prestress adjusting nut is located on the outer side of the vertical plate and the fixed plate of the movable cable, the limit nut is located on the inner surface of the vertical plate and the fixed plate of the movable cable, and the cable on the vertical plate runs through The hole corresponds to the position of the cable through hole on the movable cable fixed plate, and a cable is installed in each cable through hole; the anchorage is installed on the cable between the vertical plate and the movable cable fixed plate. on the rope.

A stiffener is connected between the side of the vertical plate and the surface of the horizontal plate on the inverted T-shaped support.

The adjustable prestressed cable fixing support provided by the utility model has the following beneficial effects: 1) It can increase the construction speed: there is a cable penetration hole on the inverted T-shaped support, which can also be used as a tension support for the jack , which is convenient for cable tensioning; the anchor can be sealed when the cable force is stretched to the design value. Once the cable force deviates due to design or construction changes, the internal force of the cable can be adjusted by controlling the rotation direction and pitch of the prestress adjusting nut, which greatly improves the tensioning construction efficiency and saves the construction period. 2) High economic efficiency: After the building is put into use, once the cable force is abnormal, if the cable is replaced or re-tensioned, it will affect the use and the entry and exit costs will be high. The prestressed cable fixed support of the utility model is adopted , the internal force of the cable can be adjusted by controlling the rotation direction and pitch of the prestress adjusting nut, which has the same effect but is more economical.

Description of drawings

Fig. 1 is the front view of the adjustable prestressed cable fixed support provided by the utility model;

Fig. 2 is the top view of the adjustable prestressed cable fixing support provided by the utility model;

Fig. 3 is the left side view of the adjustable prestressed cable fixing support provided by the utility model;

Fig. 4 is the axonometric view of the space string beam structure provided with the adjustable prestressed cable fixed support provided by the utility model;

Fig. 5 is a top view of the adjustable prestressed cable fixing support provided by the utility model for double prestressed cables;

Fig. 6 is a schematic diagram of the connection position between the adjustable prestressed cable fixed support and the tension string beam shown in Fig. 5 .

Among them: lower support structure 1, embedded backing plate 2, inverted T-shaped support 3, embedded screw 4, nut 5, high-strength bolt 6, prestress adjusting nut 7, limit nut 8, anchorage 9, cable 10 , Movable cable fixed plate 11, stiffener 12, sliding hinge support 13, fixed hinge support 14, upper chord truss 15, ball joint 16, strut 17, horizontal plate 18, vertical plate 19.

Detailed ways

The adjustable prestressed cable fixing support provided by the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 3, the adjustable prestressed cable fixing support provided by the utility model includes a pre-embedded backing plate 2, an inverted T-shaped support 3, a plurality of pre-embedded screws 4, a plurality of nuts 5, A plurality of high-strength bolts 6, a plurality of prestressed adjusting nuts 7, a plurality of limit nuts 8, one or two anchors 9 and a movable cable fixing plate 11; the embedded backing plate 2 is set in the prestressed space steel structure The top surface of the middle and lower support structure 1; the inverted T-shaped support 3 is composed of a horizontal plate 18 and a vertical plate 19, wherein the horizontal plate 18 is fixed on the surface of the embedded backing plate 2 by using a plurality of embedded screws 4 and a plurality of nuts 5 One or two cable through holes are formed in the middle of the vertical plate 19; one or two cable through holes are also formed in the middle of the movable cable fixing plate 11, which are arranged on the inside of the vertical plate 19 in a manner parallel to the vertical plate 19; The vertical plate 19 and the movable cable fixing plate 11 are connected to each other by a plurality of high-strength bolts 6, a plurality of prestress adjusting nuts 7 and a plurality of limit nuts 8, wherein the prestress adjusting nut 7 is located between the vertical plate 19 and the movable On the outer side of the cable fixed plate 11, the limit nut 8 is positioned on the vertical plate 19 and the movable cable fixed plate 11 on the inner side, and the cable through hole on the vertical plate 19 is connected with the pull cable on the movable cable fixed plate 11. The positions of the cable penetration holes are corresponding, and a cable 10 runs through each cable penetration hole; the anchorage 9 is installed on the cable 10 between the vertical plate 19 and the movable cable fixing plate 11 .

A stiffener 12 is connected between the side of the vertical plate 19 on the inverted T-shaped support 3 and the surface of the horizontal plate 18 to improve the lateral stability of the inverted T-shaped support 3 .

Now the construction process of the adjustable prestressed cable fixed support provided by the utility model is described as follows: during construction, firstly, the construction personnel will connect the other end of a sliding support to the lower support structure 1 of the prestressed space steel structure. One end of the stay cable 10 on the top passes through a stay cable penetration hole on the movable stay cable fixing plate 11 and the vertical plate 19 in sequence, then stretches the stay cable 10 to the design value according to the conventional method, and then uses the anchorage 9 to fix the stay cable 10 on the Move the cable fixed plate 11, and then connect the movable cable fixed plate 11 to the inverted T-shaped support 3 through the high-strength bolt 6, the prestress adjustment nut 7 and the limit nut 8, and then the inverted T-shaped support 3 Utilize the embedded screw rod 4 and the nut 5 to connect with the embedded backing plate 2 installed on the top surface of the lower supporting structure 1, and seal the anchor. If the follow-up design and construction do not need to adjust the cable force, then do not make any adjustments, and proceed to the next process of construction; if the actual cable force is too large or too small due to design or construction changes, you can first loosen the limit nut 8, and according to It is necessary to tighten or loosen the prestress adjusting nut 7 to increase or decrease the internal force of the drag cable 10, so as to realize the fine adjustment of the cable force after the anchor is sealed.

Example:

As shown in Figure 4, the present embodiment provides an application of an adjustable prestressed cable fixed support in a string beam structure. The string beam span in the figure is 40m, the mid-span height is 4m, and the spacing of the struts 17 is uniform. It is 5m, and stay cable 10 is two. The upper chord truss 15 is an upright triangular pyramidal space arch truss, and the shape of the stay cables 10 is close to a parabola after the initial tension. The left end is connected with the sliding support 13, and the right end is connected with the fixed support 14. Wherein, the sliding support 13 at the left end is a conventional node, and the fixed support 14 at the right end adopts the adjustable prestressed cable fixed support. While adopting the node design shown in Figures 1 to 3, the node shown in Figure 2 has been modified considering the use of double cables for the lower chord cables. The lateral stability of seat 3 is shown in Figure 5. The connection method of the inverted T-shaped support 3 with the stiffener 12 and the lower chord spherical node 16 of the upper chord truss 15 is shown in FIG. 6 .

The tension string beam with adjustable prestressed cable fixed support can change the cable force by fine-tuning the prestressed adjusting nut 7 during the form-finding process, so as to achieve the designed shape more accurately. In addition, if the tension of the cable 10 on the string beam becomes loose after long-term use, the tension of the cable can be increased by adjusting the prestress adjusting nut 7 to ensure the safety of the structure.

Claims (2)

1. An adjustable prestressed cable fixed support, characterized in that: the adjustable prestressed cable fixed support includes a pre-embedded backing plate (2), an inverted T-shaped support (3), Multiple embedded screws (4), multiple nuts (5), multiple high-strength bolts (6), multiple prestress adjusting nuts (7), multiple limit nuts (8), one or two anchors ( 9) and movable cable fixing plate (11); wherein the embedded backing plate (2) is arranged on the top surface of the lower support structure (1) in the prestressed space steel structure; the inverted T-shaped support (3) is composed of a horizontal plate (18) and vertical plate (19) constitute, and wherein horizontal plate (18) utilizes many embedded screw rods (4) and a plurality of nuts (5) to be fixed on the surface of embedded backing plate (2), vertical plate (19) One or two cable through holes are formed in the middle part; one or two cable through holes are also formed in the middle part of the movable cable fixed plate (11), which are arranged on the vertical plate (19) in a manner parallel to the vertical plate (19). Inside; the vertical plate (19) and the movable cable fixing plate (11) are connected to each other by multiple high-strength bolts (6), multiple prestressed adjusting nuts (7) and multiple limit nuts (8), wherein The prestressed adjusting nut (7) is located on the outer surface of the vertical plate (19) and the movable cable fixed plate (11), and the limit nut (8) is located in the vertical plate (19) and the movable cable fixed plate (11) On the side, and the position of the cable through hole on the vertical plate (19) is corresponding to the position of the cable through hole on the movable cable fixed plate (11), each cable through hole is penetrated with a cable (10 ); Anchor (9) is installed on the stay cable (10) between vertical plate (19) and movable stay cable fixed plate (11). 2. The adjustable prestressed cable fixing support according to claim 1, characterized in that: the side of the vertical plate (19) and the side of the horizontal plate (18) on the inverted T-shaped support (3) Stiffeners (12) are connected between the surfaces.

Images