阅读说明：本技术 一种三叉形或v形腹杆组合张弦结构施工方法 (Construction method of three-fork or V-shaped web member combined string structure ) 是由 杨大彬 范凯 孙立泰 孙毅 刘磊 于 2021-09-02 设计创作，主要内容包括：本发明提供一种三叉形或V形腹杆组合张弦结构施工张拉方法,包括如下步骤：第一步,钢拱的下表面焊接单连接板,腹杆的上端焊接一个双连接板,每组腹杆组合中的一个腹杆通过双连接板与单连接板铰接,腹杆的下端与拉索固结,剩余腹杆通过双连接板与单连接板接触连接,第二步,拉索张拉至设计拉力时,将左段索和右段索在张拉端固定,然后将接触连接的双连接板都和单连接板通过摩擦型高强螺栓连接。该方法中腹杆和拉索相交节点在张拉和使用阶段均固定,避免拉索节点在张拉时滑动、张拉后固定的张拉方式中节点摩擦力对张拉索力的影响,每段节点间拉索的张拉力易于精确控制。(The invention provides a construction tensioning method for a three-fork or V-shaped web member combined tensioning structure, which comprises the following steps: the method comprises the following steps that firstly, a single connecting plate is welded on the lower surface of a steel arch, a double connecting plate is welded on the upper end of each web member, one web member in each group of web member combination is hinged to the single connecting plate through the double connecting plate, the lower end of each web member is fixedly connected with a stay cable, the rest web members are in contact connection with the single connecting plate through the double connecting plates, secondly, the stay cable is tensioned to design tension, the left section of the stay cable and the right section of the stay cable are fixed at the tensioning end, and then the double connecting plates in contact connection are connected with the single connecting plate through friction type high-strength bolts. In the method, the intersected nodes of the web members and the inhaul cables are fixed in the tensioning and using stages, so that the influence of the friction force of the nodes on the tension cable force in the tensioning mode that the inhaul cable nodes slide during tensioning and are fixed after tensioning is avoided, and the tension force of the inhaul cables between each section of nodes is easy to accurately control.)

1. A construction method of a three-fork or V-shaped web member combined string structure is characterized by comprising the following steps:

firstly, welding a plurality of single connecting plates on the lower surface of a steel arch, welding a double connecting plate on the upper end of each web member, hinging one web member in each group of web member combination with the corresponding single connecting plate through the double connecting plate, fixedly connecting the lower ends of the web members with a guy cable, and connecting the rest web members in the web member combination with the single connecting plate through the double connecting plates in a contact manner, namely, the single connecting plate and the double connecting plates can move freely relatively when the guy cable is tensioned, and the single connecting plate and the double connecting plates are not connected in a plane;

and secondly, when the stay cable is stretched to the designed tension, fixing the left section of cable and the right section of cable at the stretching end, and then connecting the double connecting plates in contact connection with the single connecting plate through friction type high-strength bolts.

2. The construction method of the trident or V-shaped web member combined tensioning structure as claimed in claim 1, wherein the contact connection in the first step is implemented by embedding a single connecting plate between two plates of a double connecting plate.

3. The construction method of the trident or V-shaped web member combined string structure according to claim 1, wherein in the second step, the tension way of the stay cable is to simultaneously tension the left section cable and the right section cable or fix one end of the left section cable and the right section cable and tension the other end of the left section cable and the right section cable;

the construction method of the harpoon-shaped or V-shaped web member combination string structure is characterized in that the web member combination is a harpoon-shaped web member combination or a V-shaped web member combination.

4. The construction method of the tension structure of the trident or V-shaped web member combination according to claim 4, wherein in the first step, the middle web member of the trident web member combination is hinged with the corresponding single connecting plate through a double connecting plate, and the lower end of the middle web member is fixedly connected with the guy cable.

5. The construction method of the harpoon-shaped or V-shaped web member combination string structure is characterized in that in the first step, the inner web member of the V-shaped web member combination is hinged with the corresponding single connecting plate through a double connecting plate, and the lower end of the inner web member is fixedly connected with the inhaul cable.

6. The construction method of the trident or V-shaped web member combined tensioning structure according to claim 1, wherein the chord cable is concave or convex.

Technical Field

The invention belongs to the technical field of building construction, and particularly relates to a construction method of a large-span prestress string-stretching structure of a three-fork-shaped and V-shaped web member.

Background

The string structure is a large-span prestress self-balancing structure system consisting of rigid members, flexible inhaul cables and web members, can effectively reduce the internal force peak value of the arch structure, improve the rigidity and stability of the arch structure, reduce the counter force of a horizontal support, and has reasonable structure system and excellent mechanical property. Meanwhile, the light, bright, simple and transparent building effect can be achieved. Therefore, the method is widely applied to large-span and ultra-large-span buildings such as bridges, stadiums, exhibitions, transportation hubs and the like.

At present, most of the web members of the string structure are in a single-rod form, in the tensioning process, the upper ends of the web members and corresponding steel arches are hinged and connected through perforated connecting plates by pin shafts, the lower ends of the web members are fixedly connected with a stay cable, and the stay cable is fixed at the tensioning end when the tension is achieved to the design tension. When the string tensioning structure in the single-web-member form is tensioned, the web member can rotate around the top end of the web member, construction is convenient, and the tensioning technology is mature. The V-shaped and three-fork-shaped web member string tensioning structure is less in application because the upper end of the web member is hinged with the steel arch during tensioning construction, the guy cable slides at the joint of the web member and is fixed at the joint after tensioning is finished, and the construction method has the following defects: the web rod group forms one or more triangles, the structure is restrained by the web rod group and cannot rotate around the top end of the web rod group, the unbalanced tension force of the inhaul cables on two sides of the cable clamp is increased, so that the inhaul cables slide, the pore channel of the cable clamp and the inhaul cables are damaged, and the anti-sliding performance of the cable clamp is reduced; when the cable is stretched, friction force possibly exists between the cable and the node plates, so that the stretching force of the cable between each section of the node can not be effectively controlled. When the number of the web member groups is large, the number of the junction nodes of the stay cable and the web members is large, the defect is obvious, the construction quality and the mechanical property of the structure in the use stage are influenced, the manufacturing cost of the cable clamp and the cable head is large, and the cable clamp and the cable head are not good in economical efficiency.

Disclosure of Invention

Aiming at the problem of inconvenient tensioning in the stay cable construction of the string structure, the invention provides a novel construction tensioning method for a Y-shaped or V-shaped web member string structure.

The invention comprises the following steps:

firstly, welding a plurality of single connecting plates on the lower surface of a steel arch, welding a double connecting plate on the upper end of each web member, hinging one web member in each group of web member combination with the corresponding single connecting plate through the double connecting plate, fixedly connecting the lower ends of the web members with a guy cable, and connecting the rest web members in the web member combination with the single connecting plate through the double connecting plates in a contact manner, namely, the single connecting plate and the double connecting plates can move freely relatively when the guy cable is tensioned, and the single connecting plate and the double connecting plates are not connected in a plane;

and secondly, when the stay cable is stretched to the designed tension, fixing the left section of cable and the right section of cable at the stretching end, and then connecting the double connecting plates in contact connection with the single connecting plate through friction type high-strength bolts.

Preferably, the contact connection in the first step is performed in such a manner that the single connection plate is embedded between the two plates of the double connection plate.

Preferably, in the second step, the tensioning mode of the stay cable is to simultaneously tension the left section of cable and the right section of cable or fix one end of the left section of cable and the right section of cable and tension the other end of the left section of cable and the right section of cable;

preferably, the web member combination is a three-forked web member combination or a V-shaped web member combination.

Preferably, in the first step, the middle web member of the three-fork web member combination is hinged to the corresponding single connecting plate through the double connecting plates, and the lower end of the middle web member is fixedly connected with the inhaul cable.

Preferably, in the first step, the inner web member of the V-shaped web member combination is hinged to the corresponding single connecting plate through a double connecting plate, and the lower end of the inner web member is fixedly connected to the pulling cable.

Preferably, the chord is concave or convex.

The invention has the advantages of

In the tensioning construction process of the Y-shaped and V-shaped web member string structure, the upper end of only one web member in each group of web member combination is hinged with the steel arch through the perforated connecting plate by the pin shaft, the upper ends of the other web members are not connected with the steel arch in the plane and can move freely relatively, the whole web member group can rotate during tensioning, the tensioning construction process is similar to that of a single web member string structure, the tensioning construction technology is mature, and the system is simple, the stress is clear, the construction is convenient, and the cost is low.

In the construction tensioning method, the intersected nodes of the web members and the inhaul cables are fixed in the tensioning and using stages, so that the influence of the friction force of the nodes on the tension cable force in the tensioning mode that the inhaul cable nodes slide during tensioning and are fixed after tensioning is avoided, and the tension force of the inhaul cables between each section of nodes is easy to accurately control.

Drawings

In order to more clearly illustrate the construction method of the present invention, the drawings required in the novel construction tension method will be briefly described below.

FIG. 1 is a schematic diagram of a structure tensioning according to a first embodiment of the present invention;

FIG. 2 is a schematic structural tension diagram according to a second embodiment of the present invention;

fig. 3 is a schematic diagram of the connection of the node J1 according to the first embodiment and the second embodiment of the present invention;

fig. 4 is a front view schematically illustrating the connection of the node J2 according to the first and second embodiments of the present invention;

FIG. 5 is a front left view of a junction J2 according to embodiments one and two of the present invention;

fig. 6 is a front view schematically illustrating the connection of the node J2 according to the first and second embodiments of the present invention;

fig. 7 is a rear left side view of a junction J2 according to a first embodiment and a second embodiment of the present invention;

fig. 8 is a front view schematically illustrating the connection of the node J3 according to the first and second embodiments of the present invention;

fig. 9 is a front left schematic view of a junction J3 according to a first embodiment and a second embodiment of the present invention;

fig. 10 is a front view schematically illustrating the connection of the node J3 according to the first and second embodiments of the present invention;

fig. 11 is a rear left side view of a junction J3 according to a first embodiment and a second embodiment of the present invention;

in the figure: 1-a steel arch 2-an outer side web member 3-an inner side web member 4-a left section cable 5-a middle section cable 6-a right section cable 7-a middle section web member 8-a concrete column 9-a single connecting plate 10-a double connecting plate 11-a sealing plate 12-a preformed hole 13-a friction type high-strength bolt 14-a pin shaft.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present invention, it is to be understood that the terms "inner", "outer", "left" and "right" indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

[ EXAMPLES one ]

Referring to fig. 1, 3-11, the present invention discloses a novel construction tensioning method for a three-forked web member string structure, which comprises the following steps:

A. the steel arch 1 is connected with a single connecting plate 9 in a welding mode, and the upper ends of all web members are connected with a double connecting plate 10 in a welding mode through a sealing plate 11;

B. and (3) a double connecting plate 10 at the upper end of the middle web member 7 of each group of the three-fork web members is hinged with a single connecting plate 9 welded with the steel arch 1 by a pin shaft 14, and the lower end of the middle web member 7 is fixedly connected with the left section cable 4 and the middle section cable 5. The single connecting plate 9 welded with the steel arch 1 is embedded between the two plates of the double connecting plate 10 at the upper ends of the outer web member 2 and the inner web member 3, the single connecting plate 9 and the double connecting plate 10 are not connected in a plane, and can move freely relatively when being tensioned;

C. connecting two ends of the structure with a support at the top of a concrete column 8, and simultaneously tensioning the left section of cable 4 and the right section of cable 6;

D. when the tension is reached to the design tension, the double connecting plates 10 at the upper ends of the outer web member 2 and the inner web member 3 in all the three-fork-shaped web members are connected with the single connecting plate 9 welded with the steel arch 1 through the friction type high-strength bolt 13.

In step C, one end of the left segment cable 4 and the right segment cable 6 may be fixed, and the other end may be tensioned.

[ example two ]

Referring to fig. 2, 3-11, the present invention discloses a novel tensioning method for a V-shaped web member beam string structure, which comprises the following steps:

A. the steel arch 1 is connected with a single connecting plate 9 in a welding mode, and the upper ends of all web members are connected with a double connecting plate 10 in a welding mode through a sealing plate 11;

B. the double connecting plates 10 at the upper ends of the inner side web members 3 in each group of V-shaped web members are hinged with the single connecting plate 9 welded with the steel arch 1 by pin shafts 14, and the lower ends of the inner side web members 3 are fixedly connected with the left section cables 4 and the middle section cables 5. The single connecting plate 9 welded with the steel arch 1 is embedded into the double connecting plate 10 at the upper end of the outer web member 2, the single connecting plate 9 and the double connecting plate 10 are not connected in a plane, and can move freely relatively when being tensioned;

C. and connecting two ends of the structure with a support at the top of the concrete column 8, and simultaneously tensioning the left section of cable 4 and the right section of cable 6.

D. When the tension is reached to the design tension, the double connecting plates 10 at the upper ends of the outer web members 2 in all the V-shaped web members are connected with the single connecting plate 9 welded with the steel arch 1 through friction type high-strength bolts 13.

In step C, one end of the left segment cable 4 and the right segment cable 6 may be fixed, and the other end may be tensioned.

In the tensioning process, the upper end of only one web member in each group of web members is hinged with the steel arch through the perforated connecting plate by the pin shaft, the upper ends of the other web members are not connected with the steel arch in a plane and can move freely relatively, the lower ends of the web members are fixedly connected with the stay cable, the whole web member group can rotate during tensioning, the construction process is similar to that of a single-web-member string structure, the tensioning construction technology is mature, the system is simple, the stress is clear, the construction is convenient, and the cost is low.

In the construction tensioning method, the intersected nodes of the web members and the inhaul cables are fixed in the tensioning and using stages, so that the influence of the friction force of the nodes on the tension cable force in the tensioning mode that the inhaul cable nodes slide during tensioning and are fixed after tensioning is avoided, and the tension force of the inhaul cables between each section of nodes is easy to accurately control.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.