CN103061520B - Annular crossing funicular truss structure mounting method - Google Patents

Abstract

The invention relates to an installation method of an annular cross cable truss structure. First, the peripheral ring-shaped compression trusses, cables, middle struts, and double-layer laminated clamps are prefabricated in the factory, and the segmented trusses are hoisted and welded on site after transported to the site. Then install the upper chord stabilizing cables one by one in a fixed direction, install the double-layer laminated clamp nodes at the intersection of the upper chord stable cables, and fix the double-layer laminated plate nodes through the lug plates and the middle struts. The lower chord load-bearing cables and the intermediate struts are connected and fixed by double-layer laminated clamp nodes, and all the cables in the cable truss structure are in a relaxed state at this time. Afterwards, prestress is applied to the cable body, and the deformation of the peripheral annular compression truss is controlled by the method of batching and grading. Finally, clamp the double-layer laminated clamp node, that is, the installation is complete. The invention is suitable for installing the ring cross cable truss structure, the installation sequence is reasonable and clear, simple and easy to implement, can give full play to the advantages of the ring cross cable truss, and has high practical value.

Description

Installation method of circular cross cable truss structure

technical field

The invention relates to an installation method of an annular cross cable truss structure, which belongs to the field of space cable truss structures.

Background technique

With the continuous development of society, the demand for public event spaces such as large exhibition halls and sports venues is increasing day by day. Such demands have further driven the innovation of large-span spatial structure systems. A large-span space building is often a landmark building in a region. Therefore, it is not only necessary to take safety and economy as the goals of structural design, but more importantly, to express the beauty of the structure and realize the combination of strength and beauty. In recent years, long-span cable structures have been widely used in the construction of sports venues at home and abroad. The reason is that the cable structure makes full use of the mechanical properties of high-strength cables, which ensures the structural rigidity while reducing the amount of steel used, making the structure more flexible. Light and expressive.

The cable truss structure is a form of cable structure, which is widely used in public buildings such as stadiums because of its strong ability to span space and low steel consumption. The layout forms of cable truss structures mainly include parallel layout, vertical cross layout, and spoke layout. Among them, the hub-and-spoke cable truss structure (also known as ring-shaped hollow cable truss or ring-shaped tension cable truss) is suitable for buildings such as stadiums with canopies arranged around the open center, while parallel and vertically crossed cable truss structures are suitable for other buildings. The disadvantages of the spoke cable truss mainly lie in the following aspects:

1. The number of cable segments and struts is large.

2. The structure itself cannot guarantee the out-of-plane stability, and it is necessary to arrange stabilizing cables along the ring direction to ensure the out-of-plane stability of each cable truss.

3. The collapse resistance of the structure is weak. The spoke-type cable truss structure relies on the central ring cable to connect the cable trusses together, and the structure obtains sufficient rigidity and bearing capacity by tensioning the central ring cable. When a large prestress loss occurs in a certain cable or the cable body breaks, the structural stiffness decreases significantly, and even leads to the overall collapse of the structure.

Contents of the invention

The purpose of the patent of the present invention is to improve the above deficiencies, and to provide a method for installing an annular cross-cable truss structure suitable for buildings such as stadiums with canopies arranged around the open center. This cable truss structure is composed of several planar fish-belly cable trusses arranged in a circle. The flat cable trusses are cross-arranged to form an overall force space system, which can mutually ensure the out-of-plane stability, and there is no need to set hoop stabilizing cables. One strut can be shared at the intersection, so the number of struts can be reduced. At the same time, each planar fishbelly cable truss remains relatively independent. Under the condition of ensuring out-of-plane stability, the planar fishbelly cable truss itself can bear the load independently. Even if a certain cable truss quits work for some reason, the structural Redistribution of internal forces will occur, and the remaining intact planar fishbelly cable trusses can provide bearing capacity, and the structure will not collapse as a whole.

The purpose of this invention is achieved through the following technical solutions:

An installation method of a circular cross cable truss structure, the circular cross cable truss structure is mainly composed of two parts: a cable truss structure and a ring compression truss, the ring compression truss provides horizontal constraints for the cable truss structure, the cable The compression trusses are connected by pin-joint connection nodes; the cable truss structure is composed of multiple planar fish-belly cable trusses cross-combined to form a circular cross-cable truss structure with an open center and a roof covering around the periphery. The planar fish-belly cable truss structure The truss is composed of upper chord stabilizing cables, middle struts, and lower chord load-bearing cables. The middle struts connect the upper chord stabilizing cables and the lower chord load-bearing cables; Fixture nodes, double-layer laminated clamp nodes and intermediate struts are connected by pins; the ring-shaped compression truss is a triangular space truss structure, mainly composed of three circular tube-shaped ring rods and multiple circular tube-shaped web rods, and the ring rods and The web members are connected by intersecting welded joints; the upper chord stability cable and the lower chord load-bearing cable are composed of a cable body and anchors, and anchors are provided at both ends of the cable body. It is characterized in that: the installation method of the circular cross cable truss structure is as follows:

Step 1: Prefabricate the ring-shaped compression truss in the factory;

Step 2: After being transported to the installation site, use a truck crane to hoist each section of the annular compression truss to the predetermined position and fix it temporarily. After all the sections are hoisted, fine-tune the position of each section so that each section The joints on the edge of the section can be well matched. When all the joints are well matched, the structure is welded on site to form a complete ring-shaped compression truss; after the ring-shaped compression truss is spliced, it is welded to the embedded steel plate of the base. be permanently fixed;

Step 3: Prefabricate the upper chord stabilizing cable, the middle strut, the lower chord load-bearing cable and the joints of double-layer laminated clamps in the factory, and transport them to the site for installation; after the prefabrication is completed, mark the crossing joints of the cables according to the drawings to facilitate installation Double laminated fixture;

Step 4: Install the upper string stabilization cable;

Step 5: Install the double-layer laminated clamp node of the upper string stabilization cable;

Step 6: Install the double-layer laminated clamp nodes of the middle strut and the lower chord load-bearing cable;

Step 7: Install the lower string load-bearing cable;

Step 8: Apply prestress: After all the cable bodies and double-layer laminated clamp nodes are installed, prepare to apply prestress to the cable body;

Step Nine: Clamp the joints of the double laminated clamp.

The specific steps of the first step are as follows: firstly, divide the annular compression truss into several sections with identical specifications, each section mainly consists of inner ring rods, upper outer ring rods, lower outer ring rods, vertical rods, The outer slant bar, the middle slant bar, and the ear plate form a three-dimensional truss with a triangular section. The ear plate is welded on the compression truss section, and then a welding interface is reserved on the edge member of each section to facilitate on-site splicing; the processing is completed , transported to the construction site by truck in sections for installation.

The specific steps of step 4 are as follows: before hanging the cables, first set up a scaffold under the lug plate of the annular compression truss, set up a worker's operating platform, and use a crane and a construction basket to hoist the cable head and construction tools of the upper string stabilization cable to the construction platform , the worker wears the pin shaft, and installs the cable head of the upper string stabilizing cable on the ear plate of the ring pressure truss; when hoisting, use the cable clamp to hold the upper string stabilizing cable for hoisting, so as not to damage the outer protective sleeve of the upper string stabilizing cable; pull it by the hoist The tension end of the upper string stabilization cable is 2m away from the truss ear plate at the other end, and then the tooling equipment and jack are used to pull the tension end of the upper string stabilization cable into place. When the upper string stabilizing cables are in a loose state; select one lug plate as the initial installation point, first install the two upper string stabilizing cables on the lug plate, and then install the other upper string stabilizing cables in a clockwise direction after completion, and finally install the upper string stabilizing cables It is at the bottom of the installed upper string stabilizing cable, and the relative position is determined accordingly.

The specific steps of the fifth step are: after all the upper chord stabilizer cables are installed, install all the double-layer laminated clamp nodes on the cables according to the order of installing the stable cables. The double-layer laminated clamp nodes include four layers of circular Plywood, bolts and lugs. There is an ear plate on the underside of the first layer of circular splints; the first and second layer of circular splints tighten the inner cable through bolts; the third and fourth layer of circular splints clamp the outer cable through bolts ; There is a toothed groove on the inner side of the second layer of circular splint, and a toothed protrusion is set on the inner side of the third layer of circular splint. The toothed groove and the toothed protrusion can be inlaid so as to play a role of fixed angle and joint resistance. Function: When installing, first install the first layer of circular splint and the second layer of circular splint of the double-layer splint type clamp node, place the inner cable of the upper chord stabilization cable at the cable groove of the first layer of circular splint, and place the bolt Go through the two screw holes reserved on the first layer of circular plywood. The head of the bolt is on the upper side of the first layer of circular splint and the nut is on the lower side. At this time, do not tighten the nut; the second layer of circular splint is divided into two After the second layer of circular splint is in place, turn the nut on the lower side of the first layer of circular splint to gently clamp the first and second layer of circular splints, but allow the clamped inner cable to slip ;When installing the second layer of circular splints, there is no rush to fit the two semicircular splints together, and the second layer and the third layer of circular splints are adjusted before laminating; the third layer of circular splints is equipped with two Screw hole at the first layer, firstly pass the bolt through the screw hole of the third layer of circular splint, the bolt end is located on the lower side of the third layer of circular splint, and then place the toothed protrusion of the third layer of circular splint on the second layer In the toothed groove of the circular splint; after adjusting the angle of the cable through the scales on the edge of the second and third circular splints, clamp and fit the two semicircular splints of the second circular splint. The teeth of the second and third layers of circular splints bite together, the angle formed by the two layers of cables is determined, and the nodes cannot rotate; Bolts are placed on the circular plywood of the first layer in advance, and the screw holes of the circular splint of the fourth layer are aligned with the bolts to fit the circular splint of the third layer. At this time, nuts are installed on the outside of the circular splint of the fourth layer and tightened lightly. However, the outer layer cables are allowed to slide along the cable grooves; install the double-layer laminated clamp nodes at the intersection nodes of the stabilizing cables in a clockwise direction.

The specific steps of step six are as follows: an ear plate is provided on the lower side of the first round plywood of the double-layer laminated clamp node, and an ear plate is also provided on the upper part of the middle strut, and the reserved holes of the two ear plates are aligned , the strut pin passes through the reserved hole to fix the two; in the same way, install the first circular plywood of the double-layer laminated clamp node of the load-bearing cable at the lower end of the strut, and align the reserved holes of the lug plates of the two , the strut pin passes through the reserved hole to fix the two, and the middle strut is in a free suspension state at this time.

The specific steps of step seven are: the method of installing the lower chord load-bearing cable is the same as that of the upper chord stabilizing cable, the fixed end of the lower chord load-bearing cable is fixed through the ear plate and the ring-shaped compression truss, and the tension end of the lower chord load-bearing cable is pulled by the hoist To the distance of 2m from the ear plate of the truss at the other end, use the tooling equipment and the jack to pull the tension end of the lower string load-bearing cable into place, and let the worker pass the pin shaft to fix the other end of the lower string load-bearing cable to the ear plate; install them in a clockwise direction Two lower chord load-bearing cables at each lug plate; after the load-bearing cables are installed, install the second circular plywood of the double-layer laminated clamp node at the marked node, divide the plywood into two pieces, and the second circular plywood is After being in place, turn the nuts on the lower side of the first layer of circular splints, gently clamp the first and second layer of circular splints, but allow the inner cable of the clamped lower chord load-bearing cable to slip; put the third layer of circular splints The toothed protrusions of the circular splint are placed in the toothed grooves of the second circular splint. After adjusting the angle of the cable through the scales on the edges of the second and third circular splints, place the two pieces of the second circular splint The semicircular splints are clamped tightly, and the joints cannot rotate; the outer cable of the lower chord load-bearing cable is placed in the cable groove of the third layer of circular splints, and the bolts are placed on the third layer of circular splints in advance. The screw holes of the circular splint on the first layer are aligned with the bolts and the circular splint on the third layer. At this time, nuts are installed on the outside of the circular splint on the fourth layer and tightened slightly, but the outer layer cable is allowed to slide along the cable groove. At this time All the cables in the cable truss structure are in a relaxed state and cannot bear external loads.

The specific steps of the eighth step are as follows: the tensioning of each cable body adopts the method of parallel synchronous tensioning of two jacks, and the tensioning reaction device installed at the node must be firm and reliable and easy to disassemble; when tensioning, consider The impact of the cable body on the external ring-shaped compression truss, the deformation of the ring-shaped compression truss is controlled by symmetrical stretching, and the stretching is performed in batches in a fixed direction. The tensioning process is divided into four stages, and the first stage is stretched to the target. 10% of the cable force, the second stage is stretched to 30% of the target cable force, the third stage is stretched to 70% of the target cable force, and the fourth stage is over-tensioned to 105% of the target cable force to offset the loss of prestress .

The specific steps of step 9 are: after all the cable bodies are stretched, check and fine-tune each node, and after confirming that there is no error, tighten the hexagonal bolts to clamp the first circular splint of the double-layer clamp node. The upper chord stabilizing cable and the lower chord load-bearing cable are fixed at the joints of the double-layer clamps and cannot slip, that is, the installation is complete.

The cable body adopts Galfan coated cable, the anchor adopts lug sleeve adjustable anchor, and the cable truss structure is not less than 5 trusses.

Beneficial effects: this method absorbs other excellent installation methods in the installation process of long-span cable truss structures, and is combined with the structural form of the circular cross cable truss, which can give full play to the advantages of the circular cross cable truss and has high practical value.

Description of drawings

Figure 1 Axonometric view of circular cross cable truss;

Figure 2 Plane view of the compression truss section;

Fig. 3 I-I sectional view of the compression truss section;

Fig. 4 Three-dimensional diagram of the lug plate joint of the annular compression truss;

Fig. 5 Assembly drawing of annular compression truss;

Fig. 6 plane fish belly type cable truss elevation view;

Fig. 7 sectional view of cable anchor;

Figure 8 is the vertical view of the double-layer splint type cable-strut joint;

Figure 9 is a schematic diagram of the decomposition of node components;

Figure 10 Bottom view of the first layer of plywood;

Fig. 11 top view of the first layer of plywood;

Figure 12 Axonometric view of the second layer of plywood;

Figure 13 Bottom view of the second plywood;

Figure 14 bottom view of the third plywood;

Figure 15 top view of the third plywood;

Figure 16 The front view of the third plywood;

Figure 17 Bottom view of the fourth plywood;

Fig. 18 top view of the fourth plywood;

Figure 19 The front view of the fourth plywood;

In the figure: 1-ring truss under compression; 2-inner ring rod; 3-upper outer ring rod; 4-lower outer ring rod; 5-vertical rod; 6-outer oblique rod; 7-middle oblique rod; 8-ear plate; 9-upper chord stabilizing cable; 10-middle strut; 11-lower chord load-bearing cable; 12-anchor pin; 13-double-layer clamp node; 14-strut pin; One layer of circular plywood; 16-the lower ear plate of the first layer of the double-layer laminated clamp; 17-the ear plate of the middle strut; 18-the second circular splint of the double-layered clamp; Layer cable body; 20-the cable groove of the first round plywood of the double-layer laminated clamp; 21-the bolt of the first circular splint of the double-layer laminated clamp; 22-the first layer of the double-layer laminated clamp The screw hole of the circular splint; 23-the nut of the first circular splint of the double laminated clamp; 24-the third circular splint of the double laminated clamp; 25-the third layer of the double laminated clamp The screw hole of the circular splint; 26-the bolt of the third circular splint of the double laminated clamp; 27-the toothed protrusion of the third circular clamp of the double laminated clamp; 28-the double laminated clamp The toothed groove of the second circular splint of the fixture; 29-the fourth circular splint of the double laminated fixture; 30-the outer cable body; 31-the third circular splint of the double laminated fixture The cable groove of; 32-the screw hole of the fourth layer of circular splint of the double-layer laminated clamp; the nut of the fourth layer of circular splint of 33-double-layer laminated clamp.

Detailed ways

As shown in Figure 1-19, the installation method of the circular cross cable truss structure of the present invention is specifically as follows:

It is mainly composed of two parts: the cable truss structure and the ring compression truss 1. The ring compression truss 1 provides horizontal constraints for the cable truss structure. A circular cross cable truss structure with an open center and covered roofs around is formed by the cross combination of multiple planar fish-belly cable trusses. The strut 10 connects the upper chord stabilizing cables 9 and the lower chord load-bearing cables 11; the intersection of multiple upper chord stabilizing cables 9 or the lower chord load-bearing cables 11 of the cable truss structure adopts double-layer laminated clamp nodes 13, and double-layer laminated clamp nodes 13 Adopt pin type connection with the middle strut 10. The annular compression truss 1 is a triangular space truss structure, mainly composed of three circular tubular ring bars and multiple circular tubular web bars. The ring rod and the web rod are connected by intersecting welded joints. The upper chord stabilizing cable 9 and the lower chord load-bearing cable 11 are composed of a cable body and an anchor, and the two ends of the cable body are provided with anchors. Among them, the cable body adopts Galfan-coated cables, the anchors adopt fork lug sleeve adjustable anchorages, and the cable truss structure is not less than 5 trusses.

The specific installation method of the above circular cross cable truss structure is as follows:

Step 1: Prefabricate the ring-shaped compression truss 1 in the factory: firstly, divide the ring-shaped compression truss 1 into several sections with identical specifications, and each section is mainly composed of the inner ring rod 2, the upper outer ring rod 3, the lower outer ring rod Ring bar 4, vertical bar 5, outer slanting bar 6, middle slanting bar 7, and ear plate 8 form a three-dimensional truss with a triangular cross-section. The ear plate 8 is welded on the section of the truss under pressure, and then pre- The welding interface is reserved to facilitate on-site splicing; after processing, it is transported to the construction site by truck in sections for installation. The appearance of the annular compression truss is only shown in Figure 1 as an example, and the form is not limited to this;

Step 2: After transporting to the installation site, hoist the compression truss section to the predetermined position with a truck crane and fix it temporarily. After all the sections are hoisted, fine-tune the position of each section so that each section The joints on the edges can be well matched. When all the joints are well matched, the structure is welded on site to form a complete ring-shaped compression truss 1; be permanently fixed;

Step 3: Prefabricate the upper chord stabilizing cable 9, the middle strut 10, the lower chord load-bearing cable 11 and the double-layer laminated clamp node 13 in the factory, and transport them to the site for installation. After the prefabrication is completed, mark the intersection nodes of the cables according to the drawings to facilitate the installation of double-layer laminated clamps 13;

Step 4: Install the upper chord stabilization cable 9: Before hanging the cable, first set up a scaffold under the ear plate of the ring compression truss, and set up a worker's operating platform. Utilize the crane and the special hanging basket for construction to hoist the cable head and construction tools of the upper string stabilizing cable 9 to the construction platform. The worker wears the pin shaft, and installs the cable head of the stabilizing cable on the ear plate 8 (fixed end) of the compression truss 1 . When hoisting, specially designed cable clamps are used to clamp the stable cable for hoisting, so as not to damage the outer protective sleeve of the cable. Pull the tension end of the cable by the hoist to the distance of about 2m from the ear plate 8 of the truss at the other end, then use the tooling equipment and the jack to pull the tension end of the cable into place, and fix the other end of the stabilizing cable to the ear plate by the worker through the pin 12 place. This moment, upper string stabilizing cable 9 is in slack state. Select a lug plate 8 as the initial installation point, first install the two stabilizing cables on the lug plate 8, and then install other stabilizing cables in a clockwise direction after completion, and the stabilizing cables installed last are at the bottom of the installed cable systems , so as to determine the relative position;

Step 5: Install the double-layer laminated clamp nodes 13 of the upper string stabilizing cables 9: After all the upper string stabilizing cables 9 are installed, install all the double-layer laminated clamps 13 on the cables according to the order of installing the stabilizing cables. First install the first layer of circular splint 15 and the second layer of circular splint 18 of the double-layer splint type clamp, place the inner layer cable 19 at the cable groove 20 of the first layer of circular splint, and pass the bolt 21 through the first layer of circular splint. Two screw holes 22 reserved on the layer circular clamping plate 15, bolt 21 heads are on the first layer of circular clamping plate 15 upper side, and nut 23 is on the lower side, and now the nut 23 is not screwed. The second layer of circular splint 18 is divided into two pieces from the middle. After the second layer of circular splint 18 is in place, turn the nut 23 on the lower side of the first layer of circular splint 15 to gently clamp the first and second layers of circular splints. The splints 15, 18, but allow the clamped inner rope 19 to slip. When the second layer of circular splints 18 are installed, they are not in a hurry to fit the two semicircular splints together. After the second layer and the third layer of circular splints 18 and 24 adjust their angles, they will be fitted together. The third layer of circular splint 24 is provided with two screw holes 25, at first the bolt 26 is passed through the screw hole 25 of the third layer of circular splint, the bolt 26 ends are positioned at the third layer of circular splint 24 lower side, and then The toothed protrusion 27 of the third layer of circular splint 24 is placed in the toothed groove 28 of the second layer of circular splint 18 . After adjusting the cable angle through the scales on the edges of the second and third layers of circular splints 18 and 24, the two semicircular splints of the second layer of circular splint 18 are clamped and fitted together. At this time, the second and third layers of circular splints The teeth of clamping plates 18, 24 are engaged together, and the angle formed by the two layers of stay cables is determined, and the node just cannot rotate. Place the outer layer cable 30 at the cable groove 31 of the third layer of circular splint 24, the third layer of circular splint 24 has placed the bolt 26 in advance, and align the screw hole 32 of the fourth layer of circular splint 29 with the bolt 26 Fitted with the third layer of circular splint 24, at this moment, nut 33 is installed on the outside of the fourth layer of circular splint 29 and tightened slightly, but the outer layer rope 30 is allowed to slide along the cable groove 31. Install the double-layer laminated clamps 13 at the intersection nodes of the stabilizing cables in a clockwise direction;

Step 6: Install the double-layer laminate clamp node 13 of the intermediate support bar 10 and the lower chord load-bearing cable 11: set the lug plate 16 on the lower side of the first round plywood of the fixture, and the upper part of the intermediate support bar 10 is also provided with the ear plate 17 , align the reserved holes of the ear plates 16, 17, and the strut pin 14 passes through the reserved holes to fix the two. In the same way, install the first layer of circular plywood 15 of the double-layer clamp 13 of the load-bearing cable 11 at the lower end of the strut 10, align the reserved holes of the lug plates of the two, and the strut pin 14 will pass through the reserved hole. Both are fixed. At this moment, the middle strut 10 is in a freely suspended state;

Step 7: Install the lower chord load-bearing cable 11: the method of installing the lower chord load-bearing cable 11 is the same as the method for installing the upper chord stabilization cable 9, fix the fixed end of the lower chord load-bearing cable 11 to the compression truss 1 through the ear plate 8, and pull the cable by the hoist The tension end is about 2m away from the truss ear plate 8 at the other end, and then the tooling equipment and jacks are used to pull the tension end of the steel cable into place, and the other end of the load-bearing cable 11 is fixed to the ear plate 8 by the worker through the pin shaft. Install two load-bearing cables 11 at each ear plate 8 in a clockwise direction. After the load-bearing cable 11 is installed, install the second layer of circular plywood 18 of the double-layer laminated clamp node 13 at the marked node position, divide the plywood into two pieces, and after the second layer of circular splint 18 is in place, twist the first layer The nut 23 on the lower side of the circular splint 15 gently clamps the first and second layers of the circular splint 15,18, but allows the clamped inner layer cable 19 to slide. Put the toothed protrusion 27 of the third layer of circular splint 24 into the toothed groove 28 of the second layer of circular splint 18 . After the scales on the edges of the second and third layers of circular splints 18 and 24 are used to adjust the cable angle, the two semicircular splints of the second layer of circular splints 18 are fastened together so that the nodes cannot rotate. Place the outer layer cable 30 at the cable groove 31 of the third layer of circular splint 24, the third layer of circular splint 24 has placed the bolt 26 in advance, and align the screw hole 32 of the fourth layer of circular splint 29 with the bolt 26 Fitted with the third layer of circular splint 24, at this moment, nut 33 is installed on the outside of the fourth layer of circular splint 29 and tightened slightly, but the outer layer rope 30 is allowed to slide along the cable groove 31. At this time, all the cables in the cable truss structure are in a relaxed state and cannot bear external loads;

Step 8: Applying prestress: After all the cable bodies and the double-layer laminated clamp nodes 13 are installed, it is ready to apply prestress to the cable body. The tensioning of each cable body adopts the method of parallel synchronous tensioning of two jacks, and the tensioning reaction device installed at the node must be firm, reliable and easy to disassemble. Considering the influence of the cable body on the external annular compression truss 1 during tensioning, it is best to use symmetrical tensioning to control the deformation of the annular compression truss. Taking a circular cross-cable truss with 16 cables as an example, four of them The cable bodies that are symmetrical around the centroid are divided into one batch, and tensioned in batches and graded. Firstly, the first level of tension is carried out to make all the cable bodies preliminarily tensioned. At the same time, the first batch of four lower string load-bearing cables 11 that are symmetrical around the centroid are stretched, and the tension is controlled at 10% of the target cable force. After the stretching is completed, the remaining batches of lower string load-bearing cables 11 are sequentially stretched in a clockwise direction. After the lower string load-bearing cable 11 is fully stretched, the upper string stabilizer cable 9 adopts the same stretching method, with four cable bodies as a group, and sequentially stretched clockwise to 10% of the target cable force. Carry out the second and third stages of tensioning in the same way. First, stretch the lower string load-bearing cables 11. Take four load-bearing cables as a batch and stretch them clockwise to 30% and 70% of the target cable force. Stretch the upper string stabilizing cable 9 to 30% and 70% of the target cable force in turn. The fourth stage adopts the way of super tensioning to offset the loss of prestress, and the way of tensioning is the same as above. First stretch the lower string load-bearing cable 11, and then stretch the upper string stable cable 9, so that the cable force reaches 105% of the target cable force. During the stretching process, attention should be paid to the use of dual control, with tension control as the main control and deformation control as the supplement. During the stretching process, the tension and deformation values must be within the required range of the specification to continue the stretching, otherwise the stretching needs to be stopped, and the problem can only be continued after troubleshooting.

Step 9: Clamping node 13 of the double-layer laminated clamp: After all the cable bodies are stretched, check and fine-tune each node. After confirming that it is correct, tighten the hexagonal bolt 33 to clamp the splint 15 of the double-layer clamp node 13, and fix the upper string stability cable 9 and the lower string load-bearing cable 11 to the double-layer clamp node 13 so that they cannot slip, that is, the installation is complete.

The above is a typical embodiment of the present invention, and the practice of the present invention is not limited thereto.

Claims (9)

1. the mounting method of a roundabout Cable Truss Structure, described roundabout Cable Truss Structure is primarily of Cable Truss Structure and annular pressurized truss (1) two parts composition, annular pressurized truss (1) provides horizontal restraint for Cable Truss Structure part, and Cable Truss Structure is connected by pin joint formula connected node with annular pressurized truss (1); Described Cable Truss Structure forms by many Pin plane fish-bellied type cable truss combined crosswise the roundabout Cable Truss Structure that central authorities open wide, periphery covers roofing, described plane fish-bellied type cable truss is made up of the steadying line that winds up (9), middle strut (10), lower edge track cable (11), and middle strut (10) connects wind up steadying line (9) and lower edge track cable (11); Many the steadying lines that wind up (9) of described Cable Truss Structure or lower edge track cable (11) crossover sites adopt double-deck presser type fixture node (13), and double-deck presser type fixture node (13) adopts pin to be connected with middle strut (10); Annular pressurized truss (1) is leg-of-mutton space truss structure, and primarily of three tubular type ring bars and Duo Gen tubular type web member composition, ring bar and web member adopt related subgroup node to be connected; Wind up steadying line (9) and lower edge track cable (11) is made up of cable body and ground tackle, and cable body two ends are provided with ground tackle, it is characterized in that: the mounting method of described roundabout Cable Truss Structure is as follows:

Step one: be prefabricated in the factory annular pressurized truss (1);

Step 2: after transporting to erecting bed, carry out temporary fixed after annular each section of pressurized truss (1) being hung to precalculated position with mobile crane, treat all sections all rigging outs, the position of each section is finely tuned, the interface of each section edge can be coincide very well, after total interface coincide, Site Welding is carried out to structure, forms complete annular pressurized truss (1); After annular pressurized truss (1) splicing, be welded on the pre-embedded steel slab of pedestal, carried out permanent fixing;

Step 3: the drag-line that is prefabricated in the factory winds up steadying line (9), middle strut (10), lower edge track cable (11) and double-deck presser type fixture node (13), transports to in-site installation; Prefabricated complete after, carry out mark according to drawing at the crossover node position of rope, convenient double-deck presser type fixture node (13) be installed;

Step 4: install the steadying line (9) that winds up;

Step 5: the double-deck presser type fixture node (13) of installing the steadying line (9) that winds up;

Step 6: the double-deck presser type fixture node (13) of strut (10) and lower edge track cable (11) in the middle of installing;

Step 7: install lower edge track cable (11);

Step 8: Shi Hanzhang: after treating that whole cable body and double-deck presser type fixture node (13) install, prepare cable body Shi Hanzhang;

Step 9: clamp double-deck presser type fixture node (13).

2. the mounting method of a kind of roundabout Cable Truss Structure according to claim 1, it is characterized in that: the concrete steps of described step one are: first, annular pressurized truss (1) is divided into the identical section of several specifications, each section is primarily of inner ring bar (2), upper outer shroud bar (3), lower outer shroud bar (4), montant (5), outer brace (6), middle part brace (7), otic placode (8) composition triangular-section space truss, pressurized truss section welds otic placode (8), then, each section edge component reserves welding junction, to facilitate on-the-spot splicing, completion of processing, transports job site to by truck segmentation and installs.

3. the mounting method of a kind of roundabout Cable Truss Structure according to claim 2, it is characterized in that: the concrete steps of described step 4 are: before hanging cable, first below the otic placode of annular pressurized truss (1), set up scaffold, operative's platform is set, utilize crane and construction hanging basket that the rope head of the steadying line that winds up (9) and construction tool are winched to operation platform, wear bearing pin by workman, the rope head of the steadying line that winds up (9) is arranged on otic placode (8) place of annular pressurized truss (1); Adopt cord clip to clamp the steadying line (9) that winds up during lifting to lift, in order to avoid damage steadying line (9) outer jointing jacket that winds up; Steadying line (9) stretching end that winds up is drawn to distance other end truss otic placode (8) 2m by hoist engine, it is in place that recycling tooling device and jack draw steadying line (9) stretching end that winds up, wear pin (12) by workman and the other end of the steadying line that winds up (9) is fixed on otic placode (8), the steadying line (9) that now winds up is in relaxed state; A selected otic placode (8) is initial mounting point, two steadying lines that wind up (9) on this otic placode (8) are first installed, other steadying lines that wind up (9) are installed after completing in the direction of the clock successively, the steadying line that winds up (9) of rear installation is in the bottom of the mounted steadying line that winds up (9), determines relative position according to this.

4. the mounting method of a kind of roundabout Cable Truss Structure according to claim 3, it is characterized in that: the concrete steps of described step 5 are: after the steadying line that all winds up (9) installation, according to the wind up order of steadying line (9) of installation, all double-deck presser type fixture node (13) on this rope is installed, described double-deck presser type fixture node (13) comprises four layers of circular clamping plate (15, 18, 24, 29), bolt (21, 26) and otic placode (16), circular clamping plate (15) downside of first floor is provided with an otic placode (16), first and second layer of circular clamping plate (15,18) steps up internal layer rope (19) by bolt (21), third and fourth layer of circular clamping plate (24,29) clamps outer rope (30) by bolt (26), circular clamping plate (18) inner side of the second layer is provided with band mark of mouth groove (28), circular clamping plate (24) inner side of third layer is provided with band tooth projection (27), and band mark of mouth groove (28) and band tooth projection (27) can be inlayed thus play the effect of fixed angle and node resistance to plucking, the circular clamping plate (15) of first floor and the circular clamping plate (18) of the second layer of Double-layer clamp board-like fixture node (13) are first installed during installation, the internal layer rope (19) of the steadying line that winds up is placed in rope groove (20) place of the circular clamping plate (15) of first floor, by bolt (21) through upper two the reserved screws (22) of the circular clamping plate (15) of first floor, bolt (21) head at circular clamping plate (15) upside of first floor, nut (23) in downside, now not nutting (23), the circular clamping plate (18) of the second layer are divided into two pieces from centre, after the circular clamping plate (18) of the second layer are in place, turn the nut (23) of circular clamping plate (15) downside of first floor, clamp first and second layer of circular clamping plate (15,18) gently, but internal layer rope (19) slippage clamped by allowing, be in no hurry to when the second layer circular clamping plate (18) are installed, by two pieces of semicircle clamping plate laminatings, fit again after the second layer and the circular clamping plate (18,24) of third layer adjust angle, the circular clamping plate (24) of third layer are provided with two place's screws (25), first by the screw (25) of bolt (26) through the circular clamping plate of third layer, bolt (26) termination is positioned at circular clamping plate (24) downside of third layer, then the band tooth projection (27) of circular for third layer clamping plate (24) is placed in the band mark of mouth groove (28) of the circular clamping plate (18) of the second layer, after the scale adjustment drag-line angle at second and third layer of circular clamping plate (18,24) edge, by two pieces of semicircle clamping plate clampings laminating of circular for second layer clamping plate (18), now the tooth of second and third layer of circular clamping plate (18,24) is interlocked, the angle that two-layer drag-line is formed is determined, node just cannot rotate, the outer rope (30) of the steadying line that winds up is placed in rope groove (31) place of the circular clamping plate (24) of third layer, the circular clamping plate (24) of third layer placed bolt (26) in advance, the screw (32) of the 4th layer of circular clamping plate (29) is aimed at bolt (26) to fit with the circular clamping plate (24) of third layer, now tighten gently the 4th layer of circular clamping plate (29) outside mounting nuts (33), but allow outer rope (30) along rope groove (31) slippage, the double-deck presser type fixture node (13) at steadying line crossover node place is installed successively according to clockwise direction.

5. the mounting method of a kind of roundabout Cable Truss Structure according to claim 4, it is characterized in that: the concrete steps of described step 6 are: on the downside of the circular clamping plate of the first floor of double-deck presser type fixture node (13), be provided with otic placode (16), middle strut (10) top is provided with otic placode (17) equally, by the alignment of the preformed hole of both otic placodes (16,17), the two fixes through preformed hole by strut pin (14); The circular clamping plate (15) of first floor of the double-deck presser type fixture node (13) of lower edge track cable (11) are installed in strut (10) lower end in the same way, the otic placode preformed hole of the two is alignd, the two fixes through preformed hole by strut pin (14), and now, strut (10) is in free vacant state.

6. the mounting method of a kind of roundabout Cable Truss Structure according to claim 5, it is characterized in that: the concrete steps of described step 7 are: the wind up method of steadying line (9) of the method for lower edge track cable (11) and installation of installing is identical, the fixed end of lower edge track cable (11) is fixed by otic placode (8) and annular pressurized truss (1), lower edge track cable (11) stretching end is drawn to distance other end truss otic placode (8) 2m by hoist engine, it is in place that recycling tooling device and jack draw lower edge track cable (11) stretching end, wear bearing pin by workman and the other end of lower edge track cable (11) is fixed on otic placode (8), two lower edge track cables (11) at each otic placode (8) place are installed successively according to clockwise direction, after lower edge track cable (11) installation, the circular clamping plate (18) of the second layer of double-deck presser type fixture node (13) are installed at flag node position, clamping plate are divided into two pieces, after the circular clamping plate (18) of the second layer are in place, turn the nut (23) of circular clamping plate (15) downside of first floor, clamp first and second layer of circular clamping plate (15,18) gently, but internal layer rope (19) slippage of lower edge track cable (11) clamped by allowing, the band tooth projection (27) of circular for third layer clamping plate (24) is placed in the band mark of mouth groove (28) of the circular clamping plate (18) of the second layer, after the scale adjustment drag-line angle at second and third layer of circular clamping plate (18,24) edge, by two pieces of semicircle clamping plate clampings laminating of circular for second layer clamping plate (18), node just cannot rotate, the outer rope (30) of lower edge track cable (11) is placed in rope groove (31) place of the circular clamping plate (24) of third layer, the circular clamping plate (24) of third layer placed bolt (26) in advance, the screw (32) of the 4th layer of circular clamping plate (29) is aimed at bolt (26) to fit with the circular clamping plate (24) of third layer, now tighten gently the 4th layer of circular clamping plate (29) outside mounting nuts (33), but allow outer rope (30) along rope groove (31) slippage, all drag-lines now in Cable Truss Structure are in relaxed state, external load can not be born.

7. the mounting method of a kind of roundabout Cable Truss Structure according to claim 6, it is characterized in that: the concrete steps of described step 8 are: the stretch-draw of every root cable body, adopt the mode of two jack synchronous tensions in parallel, the stretch-draw counterforce device installed at Nodes must be solid and reliable and be easy to dismantle; The impact of cable body on outer annular pressurized truss (1) is considered during stretch-draw, adopt the mode of symmetrical stretch-draw to control the distortion of annular pressurized truss, with fixed-direction grading tension in batches, stretching process is divided into level Four, first order stretch-draw is to 10% of target Suo Li, second level stretch-draw to 30% of target Suo Li, third level stretch-draw to 70% of target Suo Li, fourth stage ultra stretching to target Suo Li 105% to offset loss of prestress.

8. the mounting method of a kind of roundabout Cable Truss Structure according to claim 7, it is characterized in that: the concrete steps of described step 9 are: after treating whole cable body stretch-draw, each node is checked, fine setting, confirm that errorless hex bolts of tightening afterwards is by circular for the first floor of double-deck presser type fixture node (13) clamping plate (15) clamping, to wind up steadying line (9), lower edge track cable (11) be fixed on double-deck presser type fixture node (13) place cannot slippage, namely install.

9. the mounting method of a kind of roundabout Cable Truss Structure according to claim 1, is characterized in that: described cable body adopts Galfan coating drag-line, and described ground tackle adopts fork ear muff cylinder adjustable type ground tackle, and described Cable Truss Structure is no less than 5 Pin.