A rhombic compression strut cable connection structure and a construction method thereof

Abstract

A rhombic compression bar cable connecting structure and a construction method thereof, comprising a compression bar unit, a plurality of the compression bar units are arranged in parallel along the longitudinal direction, the front and rear ends of the compression bar units are connected to corresponding front and rear edge columns respectively, the compression bar unit is in a rhombic shape, and comprises a rhombic compression bar, a rhombic connecting rod, a cable support rod and a fixed-length cable; the fixed-length cable is arranged in one-to-one correspondence with the compression bar unit; cable heads at both ends of the fixed-length cable are respectively pulled and connected to anchor ear plates at the bottom of a front end connecting node and the bottom of a rear end connecting node of the compression bar unit; and the cable support rod is arranged below the rhombic connecting rod in correspondence. Compared with the existing cable structure, the cable structure is a length-adjustable cable with an adjustable screw rod, a tensile structure of a roof structure composed of a rhombic compression bar, a support rod and a prestressed fixed-length cable is adopted, the cable is in a form without length adjustment, the structure connecting form of the rhombic compression bar, the support rod and the cable is accurately designed, construction errors are controlled, and the cable can be installed in place at one time during construction.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of string structure roof, in particular to a rhombic compression strut cable connection structure and a construction method thereof. BACKGROUND

[0002] The string structure is mainly composed of an upper rigid structure, a middle strut and a lower flexible cable, the rigid material and the flexible material are combined, the bending and compression resistance of the rigid material and the tensile capacity of the flexible structure are fully utilized, the string structure is reasonable in stress and low in steel consumption, and is widely used in the construction of large-span space buildings. At present, most of the flexible structures use cable structures as tensile members, in order to control the "force" and "shape" of the building structure system, eliminate various errors in the process of measurement, processing and installation, and usually use cable structures with adjustable screws for construction. Therefore, in order to meet the requirements of prestress in construction, the cable length needs to be adjusted repeatedly, the process is complicated, and it is also difficult to ensure that the stress and deformation of the structure meet the design state at the same time.

[0003] The installation engineering of the net rack and the cable membrane structure with a span of 60m and above is a steel structure super-dangerous engineering, the string structure is a flexible structure form, which can be expanded in various forms and contains various independent structure forms. Its performance in bending performance, material selection experiment and structure optimization is very outstanding, but its performance in structure modeling and space is relatively imperfect. The traditional string beam structure cannot directly span for steel structure super-dangerous engineering, and there are great difficulties in the overall structure stress design of steel roof and steel structure construction. SUMMARY

[0004] The purpose of the present application is to provide a rhombic compression strut cable connection structure and a construction method thereof, which solves the technical problems that when the lower flexible cable of the existing string structure uses a cable structure as a tensile member, a cable structure with an adjustable screw is usually used for construction, the cable length needs to be adjusted repeatedly in construction to meet the requirements of prestress, the process is complicated, and it is difficult to ensure that the stress and deformation of the structure meet the design state at the same time, and solves the technical problems that the traditional string beam structure cannot directly span for steel structure super-dangerous engineering, and there are great difficulties in the overall structure stress design of steel roof and steel structure construction.

[0005] To achieve the above purpose, the technical scheme is as follows:

[0006] A rhombic compression strut cable connection structure, comprising a compression strut unit transversely arranged between frame columns of a main structure, the frame column comprising front and rear edge columns, the main structure further comprising a column top frame beam connected between column tops of each frame column,

[0007] The compression rod units are longitudinally arranged in a group, and the front and rear ends are respectively connected to the corresponding front and rear edge columns,

[0008] The compression rod unit is rhombic, comprising a rhombic compression rod and a rhombic connecting rod, the rhombic compression rod is composed of four compression rods, the front and rear ends of the compression rod unit and the ends of the rhombic compression rod form two connecting nodes, which are front and rear end connecting nodes respectively, the two ends of the front side column top frame beam of the main body structure are respectively fixedly connected between the front end connecting nodes of the adjacent compression rod units, the front end connecting node is hingedly connected to the top of the front edge column, and the rear end connecting node is fixedly connected to the top of the rear edge column,

[0009] The compression rod unit further comprises a cable support rod and a fixed-length cable, the fixed-length cable is arranged one-to-one corresponding to the compression rod unit, the cable heads at the two ends of the fixed-length cable are respectively pulled and connected to the anchor ear plates at the bottom of the front and rear end connecting nodes of the compression rod unit, the cable support rod is arranged below the rhombic connecting rod, the cable support rod is V-shaped and comprises two equal-length rods, the middle part of the compression rod unit and the connecting points of the rhombic compression rod form two middle connecting nodes, the two top ends of the cable support rod are respectively hingedly connected to the two middle connecting nodes on the sides, the rhombic connecting rod and the cable support rod form an inverted isosceles triangle, and the middle part of the fixed-length cable is supported at the bottom end of the cable support rod.

[0010] The rhombic connecting rod is longitudinally arranged, and the two ends thereof are hingedly connected between the middle connecting nodes, wherein, with the rhombic connecting rod as a boundary line, the two front rods of the rhombic compression rod are located in the same front plane, and the two rear rods of the rhombic compression rod are located in the same rear plane.

[0011] The two front rods of the rhombic compression rod are front rods, and the two rear rods are rear rods,

[0012] The front rod is divided into a front rod front end part, a front rod rear end part and a front rod body part, the rear rod is divided into a rear rod front end part, a rear rod rear end part and a rear rod body part,

[0013] The rear rod front end part, the front rod rear end part and the front rod body part are prefabricated to form a front half jointing section, and the cable support rod is also prefabricated on the front half jointing section, the front rod front end part is prefabricated with the front end connecting node, the rear rod rear end part is prefabricated with the rear end connecting node, and the rear rod body part forms a rear half jointing section.

[0014] The front edge column is a V-shaped column, the V-shaped column comprises a group of V-shaped column units which are continuously arranged on the column shaft and connected as a whole, the V-shaped column unit is a vertical structure, each V-shaped column unit comprises two left and right symmetrical inclined column rods, the top ends of the inclined column rods of adjacent two V-shaped column units are fixedly connected to the same inclined column rod column top node, the column top node is a V-shaped column connecting node, and the front end connecting node is located on the upper side of the V-shaped column connecting node and is hingedly connected therebetween.

[0015] The rear row of edge columns are tree-shaped columns, which comprise a set of tree-shaped column units arranged continuously on the rear side of the column shaft and connected as a whole, the tree-shaped column unit is a three-dimensional structure, each tree-shaped column unit as a whole is an inverted quadrangular pyramid, the top surface forms a rectangular frame, the two corners of the front end of the rectangular frame are connected nodes, which are tree-shaped column connection front nodes, the rear end connection nodes are located in the same plane with the rectangular frame, and the rear end connection nodes are fixedly connected with the tree-shaped column connection front nodes.

[0016] The V-shaped column connection nodes and the tree-shaped column connection front nodes are one-to-one corresponding and located in the same vertical plane.

[0017] The rectangular frame comprises two tree main beams which are horizontally parallel and located in the same plane, and two tree connecting beams which are vertically perpendicular to the tree main beams and located in the same plane, and the two ends of the tree connecting beams are fixedly connected to the end portions of the left and right tree main beams to form the rectangular frame.

[0018] The two adjacent tree-shaped column units share one tree main beam, and the tree connecting beams are divided into front side tree connecting beams and rear side tree connecting beams,

[0019] The two corners of the rear end of the rectangular frame are connected nodes, which are tree-shaped column connection rear nodes, the rear side tree connecting beams form the column top frame beams of the rear side of the main body structure and are fixedly connected between the adjacent tree-shaped column connection rear nodes, and the two ends of the front side tree connecting beams are fixedly connected between the tree-shaped column connection front nodes.

[0020] The construction method of the rhombic compression rod cable connection structure is as follows:

[0021] Step one, constructing the front row of edge columns, the rear row of edge columns and the top frame beams, wherein the front end portion of the front rod is installed together with the front row of edge columns, and the rear end portion of the rear rod is installed together with the rear row of edge columns;

[0022] Step two, constructing the compression rod unit:

[0023] Three rows of vertical temporary support frames are arranged in the interior of the main body structure, and three groups of temporary support frames and compression rod units are arranged horizontally one by one and correspondingly, which are a rear frame, a middle frame and a front frame, and the setting positions correspond to the splicing positions of the rear end portion of the rear rod and the rod body portion, the splicing positions of the front half splicing section and the rear half splicing section, and the splicing positions of the front half splicing section and the front end portion of the front rod respectively;

[0024] The rear half splicing section is hoisted and the two ends are respectively placed on the two sides of the rear frame and the middle frame, and the rear end of the rear half splicing section is spliced and connected with the rear end portion of the rear rod; the front half splicing section is hoisted and the two ends are respectively placed on the two sides of the middle frame and the front frame, and the front half splicing section is spliced and connected with the front end portion of the front rod, and finally the front half splicing section and the rear half splicing section are spliced and connected;

[0025] Step three, measuring the cable length of the fixed length cable;

[0026] After the construction of the diamond-shaped compression bar is completed, the length of the cable is measured on site, the distance between the two end anchoring plates is measured by using a total station instrument, the measurement accuracy is controlled within 2mm, the length of the fixed-length cable is accurately determined by establishing a three-dimensional coordinate system of the roof structure, and the cable is processed;

[0027] Step four, installation and tensioning of fixed-length cable: remove the rear frame and the front frame, and keep the middle frame;

[0028] Step a, use the cable unwinding device and the automobile crane to perform unwinding processing and prepare for the cable unwinding operation;

[0029] Step b: lay the cable unwinding ground roll on the ground, set up a winch at the end of the unwinding direction, and cooperate to perform the cable unwinding operation;

[0030] Step c: after unwinding the cable, fix the cable clamp on the ground according to the cable clamp positioning line;

[0031] Step d: install the cable clamp in place at the bottom of the cable strut by combining the automobile crane and the winch;

[0032] Step e: combine the winch to pull the cable head to the vicinity of the anchoring plate;

[0033] Step f: pull the tensioning end in stages and batches;

[0034] Step g: remove the middle frame and hand over the roof operation;

[0035] Step five, tensioning early warning value and treatment measures:

[0036] The vertical cable tensioning design value and the tensioning force value during tensioning are displayed through a digital pressure gauge. When the design force value is exceeded, stop tensioning. Set the early warning value to 5% of the prestress value. When the digital pressure gauge displays exceeds this number, immediately stop tensioning and take remedial measures. The remedial measures are: apply prestress pressure, loosen the cable adjuster device, measure the cable force again after loosening, and repeatedly apply and adjust the prestress until the cable force reaches the design force value.

[0037] Step six: monitoring and measurement: the monitoring content is cable force and shape;

[0038] During the tensioning process, the cable force of each cable is monitored through oil pressure. A deformation measuring point is arranged at the intersection of each compression bar unit and the cable strut. The deformation monitoring uses a total station instrument. The deformation observation of the measuring point needs to obtain the displacement data of the selected point in three directions for static periodic monitoring.

[0039] Step f in step four is specifically constructed as follows:

[0040] During the tensioning process of the fixed-length cable, the two ends are synchronously pulled and tensioned, and the tensioning batch is three times, namely the first time, the second time and the third time, and the tensioning is pulled in batches according to 50% to 90% to 105% of the calculated tensioning force, in order to ensure that the tensioning force reaches the design requirement, in the actual tensioning process, the method of over-tensioning is adopted, and each time the tensioning force is over-calculated by 5% of the theoretical calculation tensioning force;

[0041] The tensioning is carried out on two horizontal fixed-length cables at longitudinally symmetrical positions as a group, and each group is tensioned at the same time, and the tensioning sequence is as follows:

[0042] The first time: starting from the edge of the main structure, the tensioning is carried out towards the center of the main structure in groups;

[0043] The second time: starting from the center of the main structure, the tensioning is carried out towards the edge of the main structure in groups;

[0044] The third time: starting from the edge of the main structure, the tensioning is carried out towards the center of the main structure in groups.

[0045] Compared with the prior art, the present application has the following characteristics and beneficial effects:

[0046] Compared with the existing cable structure, the present application is a length-adjustable cable with an adjustable screw rod, and has the defect that the cable length needs to be repeatedly adjusted in construction to meet the prestress requirement. The present application adopts a rhombic compression strut cooperated with a strut and a prestressed fixed-length cable to form a structure unit of the tensile structure roof structure, the cable is in the form of non-adjustable length, the structure connection form of the rhombic compression strut, the strut and the cable is accurately designed, the construction error is controlled, and the structure can be installed in place at one time in construction, and only prestress tensioning control is needed to make the structure reach the design state of 'force' and'shape', and the cable length does not need to be repeatedly adjusted, so that the construction is convenient.

[0047] The tensile structure is a flexible structure form, can be developed in multiple forms, and contains multiple independent structure forms. The performance of the tensile structure is very outstanding in bending performance, material selection experiment and structure optimization, but the performance in structure modeling and space is relatively imperfect. In view of these factors, the swimming pool steel structure adopts a design scheme that a rhombic compression strut cooperated with a strut and a prestressed cable form a tensile structure unit, the form of the tensile structure is very flexible, can realize multiple space forms, and can meet various building requirements. Meanwhile, the rhombic compression strut section is box-shaped, has a larger internal space, and can bear larger load.

[0048] The present application designs the compression strut into a rhombus, the rhombic compression strut is a special compression member, has good bearing capacity, and has a larger internal space, so that larger load can be borne. The four edges of the rhombus can bear load, and under the same size, the rhombic compression strut can bear higher pressure and torque, so that the bearing capacity is effectively increased.

[0049] The rhombus can form a larger resistance surface under the action of wind, and improve the stability and wind resistance of the structure. This is because the four corners of the rhombus compression strut can become the force arm against the wind, thereby forming a larger resistance surface. The rhombus compression strut can effectively reduce the stress of the structure under the action of wind, and improve the stability and wind resistance.

[0050] The present application utilizes the features that the rear frame column is larger than the front frame column in supporting the counter-bending moment, and designs the special-shaped supporting column of the beam string structure, the V-shaped special column in the same vertical plane is designed at the low end of the front side to realize the front side support of the beam string structure, the three-dimensional tree-shaped special column is designed at the high end of the rear side to realize the rear side support of the beam string structure, and the features that the counter-bending moments of the two sides are not equal are balanced, and the main beam of the roof is formed by designing the traditional symmetrical beam string structure into the rhombus compression strut structure of the asymmetric beam string structure between the two special columns, so that the super-dangerous large project of the roof steel structure is met.

[0051] The present application has clear force transmission, and the connection positions of structures are designed into hinges with the maximum possibility, the force bearing relationship of the whole structure of the roof is met through the ingenious design of the hinge points, and the simplification in the subsequent construction process is realized. BRIEF DESCRIPTION OF DRAWINGS

[0052] The present application will be further described in detail below with reference to the drawings.

[0053] Figure 1 It is a plane structure schematic diagram of the present application.

[0054] Figure 2 It is a three-dimensional structure schematic diagram of the present application.

[0055] Figure 3 It is a side view structure schematic diagram of the present application.

[0056] Figure 4 It is a plane layout diagram of the temporary support frame of the present application.

[0057] Figure 5 It is a schematic diagram of hoisting the rear half splicing section in step two of the construction method of the present application.

[0058] Figure 6 It is a schematic diagram of hoisting the front half splicing section in step two of the construction method of the present application.

[0059] Figure 7 It is a schematic diagram of step a in step four of the construction method of the present application.

[0060] Figure 8 It is a schematic diagram of step b in step four of the construction method of the present application.

[0061] Figure 9 It is a schematic diagram of step c in step four of the construction method of the present application.

[0062] Figure 10 It is a schematic diagram of step d in step four of the construction method of the present invention.

[0063] Figure 11 It is a schematic diagram of step e in step four of the construction method of the present invention.

[0064] Figure 12 It is a schematic diagram of step f in step four of the construction method of the present invention.

[0065] Figure 13 It is a schematic diagram of step g in step four of the construction method of the present invention.

[0066] Figure 14 It is a schematic diagram of the tensioning sequence direction and numbering in step f of step four of the construction method of the present invention.

[0067] Figure 15 It is a schematic diagram of the specific arrangement of deformation detection points in step six of the construction method of the present invention.

[0068] Figure numerals: 1-front side column, 11-oblique column, 2-rear side column, 21-rectangular frame, 211-tree main beam, 212-tree connecting beam, 3-pressure rod unit, 31-diamond pressure rod, 32-diamond connecting rod, 33-cable support rod, 34-fixed length cable, 3a-front end of front rod, 3b-rear end of front rod, 3c-front rod body, 3d-front end of rear rod, 3e-rear end of rear rod, 3f-rear Pole body, 4-top frame beam, 5-front connecting node, 6-rear connecting node, 7-middle connecting node, 8-V-shaped column connecting node, 9-tree-shaped column connecting front node, 10-tree-shaped column connecting rear node, 13-rear frame, 14-middle frame, 15-front frame, 16-cable drum, 17-truck crane, 18-cable roller, 19-winch, 20-cable clamp, 22-cable head, 23-anchor ear plate. DETAILED DESCRIPTION

[0069] For example, see Figure 1-3 As shown, a diamond-shaped compression rod and cable connection structure includes a compression rod unit 3 arranged horizontally between the frame columns of the main structure, the frame columns include front side columns 1 and rear side columns 2, and the main structure also includes column top frame beams 4, which are connected between the column tops of each frame column.

[0070] The pressure rod units 3 are arranged in a group in parallel along the longitudinal direction, and the front and rear ends are respectively connected to the corresponding front row side columns 1 and rear row side columns 2.

[0071] The compression bar unit 3 is rhombic, comprising a rhombic compression bar 31 and a rhombic connecting rod 32, the rhombic compression bar is composed of four compression bars, the front and rear ends of the compression bar unit 3 and the end of the rhombic compression bar 31 form two connecting nodes, which are the front end connecting node 5 and the rear end connecting node 6 respectively, the two ends of the front side column top frame beam 4 of the main body structure are fixedly connected between the front end connecting nodes 5 of the adjacent compression bar units 3 respectively, the front end connecting node 5 is hingedly connected with the column top of the front row of edge columns 1, and the rear end connecting node 6 is fixedly connected with the column top of the rear row of edge columns 2.

[0072] The compression bar unit 3 further comprises a cable brace 33 and a fixed-length cable 34, the fixed-length cable 34 is provided in one-to-one correspondence with the compression bar unit 3, the cable heads at the two ends of the fixed-length cable 34 are respectively pulled and connected to the anchoring ear plates at the bottom of the front end connecting node 5 and the bottom of the rear end connecting node 6 of the compression bar unit 3, the cable brace 33 is provided below the rhombic connecting rod 32 in correspondence, the cable brace 33 is V-shaped and comprises two equal-length rods, the middle part of the compression bar unit 3 and the connecting point of the rhombic compression bar 31 form two middle connecting nodes 7, the two top ends of the cable brace 33 are respectively hingedly connected with the two middle connecting nodes 7 on the sides, the rhombic connecting rod 32 and the cable brace 33 form an inverted isosceles triangle, and the middle part of the fixed-length cable 34 is supported at the bottom end of the cable brace 33.

[0073] The rhombic connecting rod 32 is longitudinally arranged and hingedly connected between the middle connecting nodes at the two ends, wherein the rhombic compression bar 31 is divided into two front rods in the same front plane and two rear rods in the same rear plane by the rhombic connecting rod 32 as a boundary line.

[0074] The two front rods of the rhombic compression bar are front rods, and the two rear rods are rear rods, the front rod is divided into a front rod front end part 3a, a front rod rear end part 3b and a front rod body part 3c, which are three spliced prefabricated parts, the rear rod is divided into a rear rod front end part 3d, a rear rod rear end part 3e and a rear rod body part 3f, which are three spliced prefabricated parts, the rear rod front end part 3d, the front rod rear end part 3b and the front rod body part 3c are prefabricated together to form a front half spliced section, and the cable brace 33 is also prefabricated together on the front half spliced section, the front rod front end part 3a is prefabricated together with the front end connecting node, the rear rod rear end part 3e is prefabricated together with the rear end connecting node, and the rear rod body part 3f forms a rear half spliced section.

[0075] In the embodiment, the front row of edge columns 1 is a V-shaped column, the V-shaped column comprises a group of V-shaped column units which are continuously arranged on the column shaft and connected into one body, the V-shaped column unit is a vertical structure, each V-shaped column unit comprises two left and right symmetrical inclined column rods 11, the top ends of the inclined column rods 11 of two adjacent V-shaped column units are fixedly connected to the same inclined column rod column top node, which is a V-shaped column connecting node 8, and the front end connecting node 5 is located on the upper side of the V-shaped column connecting node 8 and is hingedly connected therebetween.

[0076] In this embodiment, the rear row of edge columns 2 are tree-shaped columns, which include a group of tree-shaped column units arranged continuously on the rear side of the column axis and connected as a whole, the tree-shaped column unit is a three-dimensional structure, each tree-shaped column unit is a whole inverted quadrangular pyramid, the top surface forms a rectangular frame 21, the front end of the rectangular frame 21 is connected to the tree-shaped column connection front node 9, and the rear end connection node 6 is located on the same plane as the rectangular frame 21, and the rear end connection node 6 is fixedly connected to the tree-shaped column connection front node 9.

[0077] The V-shaped column connection node 8 and the tree-shaped column connection front node 9 are one-to-one corresponding and located in the same vertical plane.

[0078] The rectangular frame 21 includes two tree main beams 211 which are horizontally parallel and located in the same plane, and two tree connecting beams 212 which are vertically perpendicular to the tree main beams 211 and located in the same plane, and the two ends of the tree connecting beams 212 are fixedly connected to the end portions of the left and right tree main beams 211 to form a rectangular frame. Adjacent two tree-shaped column units share a tree main beam 211, the tree connecting beams 212 are divided into front side tree connecting beams and rear side tree connecting beams, the rear end of the rectangular frame 21 is connected to the tree-shaped column connection rear node 10, the rear side tree connecting beams form the column top frame beam 4 of the main body structure on the rear side, and are fixedly connected between adjacent tree-shaped column connection rear nodes 10, and the two ends of the front side tree connecting beams are fixedly connected between the tree-shaped column connection front nodes 9.

[0079] The construction method of the rhombic compression bar cable connection structure is as follows:

[0080] In this embodiment, the roof adopts a rhombic compression bar and a prestressed cable to form a cable-strut structure unit, and 14 rhombic compression bar cable-strut structure units are arranged, the maximum span of the cable-strut structure unit is 58.14 m, and the rhombic compression bar section is a box beam with a size of 900 mm x 500 mm x 20 mm x 30 mm. The initial design cable force of a single cable is about 1300 kN-1800 kN, the tension force is about 1300 kn-2000 kN, and 14 cables adopt 1570 full-closed high-vanadium cables with a diameter of 80 mm.

[0081] Step one, construction of the front row of edge columns 1, the rear row of edge columns 2 and the top frame beam 4, wherein the front end 3a of the front rod is installed together with the front row of edge columns 1, and the rear end 3e of the rear rod is installed together with the rear row of edge columns 2.

[0082] Step two, construction of the compression rod unit 3:

[0083] Three rows of vertical temporary support frames are provided in the longitudinal direction of the internal construction of the main structure, and three are arranged in a group horizontally, corresponding to the temporary support frames and the pressure rod units 3, namely the rear frame 13, the middle frame 14 and the front frame 15. The setting positions correspond to the splicing position of the rear end portion 3e of the rear rod and the rear rod body 3f, the splicing position of the front half splicing section and the rear half splicing section, and the splicing position of the front half splicing section and the front end of the front rod.

[0084] The specific temporary support frame layout is as follows Figure 4-6 As shown, see Figure 4 As shown, P1-P15 is the middle frame 14, P16-P30 is the rear frame, and P31-P45 is the rear frame. Figure 5 As shown, the rear half of the splicing section is hoisted, and the two ends are respectively placed on the rear frame 13 and the middle frame 14 on both sides, and the rear end of the rear half of the splicing section is spliced ​​and connected to the rear end portion 3e of the rear rod; see Figure 6 As shown, the front half of the splicing section is hoisted, and the two ends are respectively placed on the middle frame 14 and the front frame 15 on both sides, and the front half of the splicing section is spliced ​​and connected to the front end portion 3a of the front rod. Finally, the front half of the splicing section is spliced ​​and connected to the rear half of the splicing section. The cranes on both sides can lift separately or simultaneously.

[0085] Step 3: measuring the length of the fixed-length cable;

[0086] After the construction of the diamond-shaped pressure rods is completed, the length of the long cable is measured on site, and the distance between the anchor ear plates at both ends is measured using a total station. The measurement accuracy is controlled within 2mm. By establishing a three-dimensional coordinate system for the roof structure, the length of the fixed-length cable is accurately determined, and the cable is processed.

[0087] Step 4: Installation and tensioning of fixed-length cables: remove the rear frame 13 and the front frame 15, and retain the middle frame 14;

[0088] See also Figure 7 As shown, in step a, the cable tray 16 and the truck crane 17 are used to open the cable tray to prepare for the cable unwinding operation;

[0089] See also Figure 8 As shown, step b: laying a cable spreading roller 18 on the ground, and setting a winch 19 at the end of the cable spreading direction to cooperate with the cable spreading operation;

[0090] See also Figure 9 As shown, step c: after the cable is extended, the cable clamp 20 is fixed on the ground according to the cable clamp positioning line;

[0091] See also Figure 10 As shown, step d: combining the car crane 17 and the winch 19 to install the cable clamp 20 in place at the bottom of the cable support rod 33;

[0092] See also Figure 11As shown, step e: combined with the winch 19, the traction cable head 22 to the anchoring ear plate 23 near;

[0093] Referring to Figure 12 As shown, step f: traction tension end in batches;

[0094] Referring to Figure 13 As shown, step g: after traction, install in place, remove the middle frame, and hand over the roofing operation.

[0095] Step f in step four is constructed as follows:

[0096] During the tensioning process of the constant-length cable, the two ends are synchronously pulled and tensioned, and the tensioning batch is three times, namely the first time, the second time and the third time, and the tensioning is pulled in batches according to 50%→90%→105% of the calculated tensioning force. In order to ensure that the tensioning force reaches the design requirement, in the actual tensioning process, the method of over-tensioning is adopted, and each time the theoretical calculation tensioning force is over-tensioned by 5%;

[0097] The tensioning is carried out on two horizontal constant-length cables at longitudinally symmetrical positions as a group, and each group is tensioned at the same time, and the tensioning sequence is as follows:

[0098] The first time: starting from the edge of the main structure, the tensioning is carried out to the center of the main structure in groups;

[0099] The second time: starting from the center of the main structure, the tensioning is carried out to the edge of the main structure in groups;

[0100] The third time: starting from the edge of the main structure, the tensioning is carried out to the center of the main structure in groups.

[0101] In the actual construction, the constant-length cables are marked with cable numbers, and referring to Figure 14 As shown, the specific tensioning direction and number are shown in the figure, and the tensioning is shown in the following table:

[0102]

[0103] For the prestress of the constant-length cable, the pre-tension value of the prestressed cable is obtained according to the model simulation calculation and design mutual checking. The method of applying prestress is: through the oil pump, the oil pressure is transmitted to the two jacks, and then the adjusting sleeve is adjusted to reach the required applied force.

[0104] Tensioning equipment installation: since the tensioning equipment components are more, careful placement must be made during installation, so that the centroid of the tensioning equipment coincides with the steel cable, so as to ensure that the prestressed steel rod does not produce eccentricity during tensioning;

[0105] After the oil pump starts to supply oil normally, start pressurizing, when the pressure reaches the design tension of the constant-length cable, over-tension by about 5% and then stop pressurizing. When tensioning, the oil supply speed should be controlled, and the oil supply time should not be less than 0.5 min.

[0106] During tensioning, measurement and tensioning must proceed simultaneously. A hydraulic gauge displays the tension reading. When the design value is reached, tensioning is stopped. Surveyors then measure and compare the elevation corresponding to that point, comparing the pre-tensioned and post-tensioned elevations. If the elevations meet the design drawings, tensioning of the next cable is initiated. If not, appropriate adjustments are made. The principle of adjustment is: if the design requirements are exceeded, tension is released; if the design requirements are not met, over-tensioning is applied. Throughout this process, surveyors continuously measure and provide guidance for tensioning.

[0107] During the tensioning process, prestress is applied through a manual hydraulic press and a jack, and the magnitude of the applied prestress is read through its digital hydraulic gauge. Therefore, tensioning is stopped when the digital hydraulic gauge displays the design force value. The surveyor can also measure the cable tension again through the cable tension dynamic meter to repeatedly monitor the cable tension.

[0108] The key points of tensioning are: construction personnel must be present during the tensioning process to ensure that the pre-tension force is consistent with the designed pre-tension force; the elevation of the upper ear plate of the cable and the cable tension in the steel cable must be repeatedly monitored before and after tensioning.

[0109] Step 5: Tension warning value and treatment measures:

[0110] The vertical cable tensioning design value and the tensioning force value during tensioning are displayed by a digital pressure gauge. When the design force value is exceeded, tensioning is stopped. The warning value is set to 5% of the prestressing value. When the digital pressure gauge shows that it exceeds this value, tensioning is stopped immediately and remedial measures are taken. The remedial measures are: by applying prestressing pressure, loosening the regulator device on the cable, measuring the cable tension again after loosening, and repeatedly applying and adjusting the prestressing force until the cable tension reaches the design force value;

[0111] Step 6: Monitoring and measurement: monitoring content is cable force and position;

[0112] During the traction and tensioning process, the cable force of each cable is monitored by oil pressure; a deformation measuring point is arranged at the intersection of each pressure rod unit 3 and the cable support rod 33. The specific deformation detection point arrangement is as follows: Figure 15 As shown, they are numbered D01-D14 respectively. The deformation monitoring adopts the total station. The deformation observation of the measuring point needs to obtain the displacement data in three directions of the selected point for static regular monitoring.

Claims

1. A diamond compression strut cable tie construction, characterized by: The frame column of the main body structure includes front row edge column (1) and rear row edge column (2), and the main body structure further includes column top frame beam (4) connected between the column top of each frame column, The compression rod unit (3) is longitudinally arranged in parallel with a group, and the front and rear ends are respectively connected to the corresponding front row edge column (1) and rear row edge column (2), The compression rod unit (3) is rhombic, including rhombic compression rod (31) and rhombic connecting rod (32), the rhombic compression rod is composed of four compression rods, the front and rear ends of the compression rod unit (3) and the end of the rhombic compression rod (31) form two connection nodes, which are front end connection node (5) and rear end connection node (6) respectively, the two ends of the front side column top frame beam (4) of the main body structure are respectively fixedly connected between the front end connection nodes (5) of the adjacent compression rod units (3), the front end connection node (5) is hingedly connected to the column top of the front row edge column (1), and the rear end connection node (6) is fixedly connected to the column top of the rear row edge column (2), The compression rod unit (3) further includes cable brace (33) and fixed-length cable (34), the fixed-length cable (34) is arranged one-to-one with the compression rod unit (3), the cable heads at the two ends of the fixed-length cable (34) are respectively pulled and connected to the anchor ear plates at the bottom of the front end connection node (5) and the bottom of the rear end connection node (6) of the compression rod unit (3), the cable brace (33) is arranged below the rhombic connecting rod (32) in correspondence, the cable brace (33) is V-shaped and includes two equal-length rods, the middle part of the compression rod unit (3) and the connection point of the rhombic compression rod (31) form two middle connection nodes (7), the two top ends of the cable brace (33) are respectively hingedly connected to the two middle connection nodes (7) on the two sides, the rhombic connecting rod (32) and the cable brace (33) form an inverted isosceles triangle, and the middle part of the fixed-length cable (34) is supported at the bottom end of the cable brace (33); The front row edge column (1) is a V-shaped column, the V-shaped column includes a group of V-shaped column units arranged continuously on the column shaft and connected as a whole, the V-shaped column unit is a vertical structure, each V-shaped column unit includes two left and right symmetrical inclined column rods (11), the top ends of the inclined column rods (11) of the adjacent two V-shaped column units are fixedly connected to the same inclined column rod column top node, which is a V-shaped column connection node (8), the front end connection node (5) is located on the upper side of the V-shaped column connection node (8) and is hingedly connected therebetween; The rear row edge column (2) is a tree-shaped column, the tree-shaped column includes a group of tree-shaped column units arranged continuously on the column shaft in close proximity to the rear side in the longitudinal direction and connected as a whole, the tree-shaped column unit is a three-dimensional structure, each tree-shaped column unit as a whole is an inverted quadrangular pyramid, the top surface forms a rectangular frame (21), the front end two corner connection nodes of the rectangular frame (21) are tree-shaped column connection front nodes (9), the rear end connection node (6) is located on the same plane as the rectangular frame (21), and the rear end connection node (6) is fixedly connected with the tree-shaped column connection front node (9).

2. The diamond compression strut cable connection configuration of claim 1, wherein: The rhombic connecting rod (32) is longitudinally arranged, and two ends thereof are hingedly connected between the middle connecting nodes, wherein the front two rods of the rhombic compression rod (31) are located in the same front plane, and the rear two rods of the rhombic compression rod (31) are located in the same rear plane, with the rhombic connecting rod (32) as a boundary.

3. The diamond compression strut cable connection configuration of claim 2, wherein: The front two rods of the rhombic compression rod are front rods, and the rear two rods are rear rods. The front rod is divided into a front rod front end portion (3a), a front rod rear end portion (3b), and a front rod body portion (3c), which are three spliced prefabricated portions, and the rear rod is divided into a rear rod front end portion (3d), a rear rod rear end portion (3e), and a rear rod body portion (3f), which are three spliced prefabricated portions. The rear rod front end portion (3d), the front rod rear end portion (3b), and the front rod body portion (3c) are prefabricated together to form a front half spliced segment, and a cable strut (33) is also prefabricated together on the front half spliced segment, the front rod front end portion (3a) is prefabricated together with the front end connecting node, the rear rod rear end portion (3e) is prefabricated together with the rear end connecting node, and the rear rod body portion (3f) forms a rear half spliced segment.

4. The diamond compression strut cable connection configuration of claim 1, wherein: The V-shaped column connecting nodes (8) and the tree-shaped column connecting front nodes (9) correspond to each other in front and back, respectively, and are located in the same vertical plane.

5. The diamond compression strut cable tie construction of claim 1 wherein: The rectangular frame (21) includes two tree main beams (211) which are transversely parallel and located in the same plane, and also includes two tree connecting beams (212) which are longitudinally perpendicular to the tree main beams (211) and located in the same plane, and the two ends of the tree connecting beams (212) are fixedly connected to the end portions of the left and right tree main beams (211) to form a rectangular frame.

6. The diamond compression strut cable connection configuration of claim 5, wherein: Two adjacent tree-shaped column units share one tree main beam (211), and the tree connecting beams (212) are divided into front and rear tree connecting beams. The rear end corner connecting nodes of the rectangular frame (21) are the tree-shaped column connecting rear nodes (10), the rear tree connecting beams form the column top frame beams (4) on the rear side of the main body structure, and are fixedly connected between adjacent tree-shaped column connecting rear nodes (10), and the two ends of the front tree connecting beams are fixedly connected between the tree-shaped column connecting front nodes (9).

7. A construction method of the diamond compression strutting cable connection configuration according to claim 3, characterized by, The construction steps are as follows: Step one, construct the front row of edge columns (1), the rear row of edge columns (2), and the column top frame beams (4), wherein the front rod front end portion (3a) is installed together with the front row of edge columns (1), and the rear rod rear end portion (3e) is installed together with the rear row of edge columns (2); Step two, construct the compression rod unit (3): Three rows of vertical temporary support frames are longitudinally arranged in the interior of the main body structure, and three groups of temporary support frames and compression rod units (3) are transversely arranged in correspondence, which are the rear frame (13), the middle frame (14), and the front frame (15), and the setting positions correspond to the splicing positions of the rear rod rear end portion (3e) and the rear rod body portion (3f), the splicing positions of the front half spliced segment and the rear half spliced segment, and the splicing positions of the front half spliced segment and the front rod front end portion, respectively. After hoisting the rear half splice section, the two ends are respectively placed on the two sides of the rear frame (13) and the middle frame (14), the rear end of the rear half splice section is spliced and connected with the rear end part (3e) of the rear rod, the front half splice section is hoisted, the two ends are respectively placed on the two sides of the middle frame (14) and the front frame (15), the front half splice section is spliced and connected with the front end part (3a) of the front rod, and finally the front half splice section is spliced and connected with the rear half splice section; Step three, measure the length of the fixed length cable; After the construction of the diamond-shaped compression rod is completed, the length of the fixed length cable is measured on site, the distance between the two end anchoring ear plates is measured by using a total station instrument, the measurement accuracy is controlled within 2mm, the length of the fixed length cable is accurately determined by establishing a three-dimensional coordinate system of the roof structure, and the cable is processed; Step four, installation and tensioning of the fixed length cable: remove the rear frame (13) and the front frame (15), and keep the middle frame (14); Step a, use the cable unwinding disc (16) and the automobile crane (17) to perform unwinding disc processing and prepare for the cable unwinding operation; Step b: lay the cable unwinding ground roller (18) on the ground, set the winch (19) at the end of the cable unwinding direction, and cooperate to perform the cable unwinding operation; Step c: after unwinding the cable, fix the cable clamp (20) on the ground according to the cable clamp positioning line; Step d: install the cable clamp (20) in place at the bottom of the cable strut (33) in combination with the automobile crane (17) and the winch (19); Step e: in combination with the winch (19), pull the cable head (22) to the vicinity of the anchoring ear plate (23); Step f: pull the tensioning end in stages and batches; Step g: after pulling is completed, install in place, remove the middle frame, and hand over the roof operation; Step five, tensioning early warning value and treatment measures: The vertical cable tensioning design value and the tensioning force value during tensioning are displayed through a digital pressure gauge, when the design force value is exceeded, tensioning is stopped, the early warning value is 5% of the prestress value, when the digital pressure gauge displays exceeds this number, tensioning is immediately stopped, and remedial measures are taken, the remedial measures are: through the application of prestress pressure, loosen the adjuster device on the cable, after loosening, measure the cable force again, repeatedly apply and adjust the prestress until the cable force reaches the design force value; Step six: monitoring and measurement: the monitoring content is cable force and shape; During the tensioning process, the cable force of each cable is monitored through oil pressure; A deformation measuring point is arranged at the intersection of each compression rod unit (3) and the cable strut (33), deformation monitoring uses a total station instrument, the deformation observation of the measuring point needs to obtain the displacement data of the selected point in three directions, and static periodic monitoring is performed.

8. The construction method of the diamond-shaped compression rod cable connection structure according to claim 7, characterized in that: Step f in step four is specifically constructed as follows: During the tensioning process of the fixed length cable, the two ends are synchronously pulled and tensioned, the tensioning batches are three, respectively the first time, the second time and the third time, and the tensioning is pulled in batches according to 50%→90%→105% of the calculated tensioning force, in order to ensure that the tensioning force reaches the design requirement, in the actual tensioning process, the method of over-tensioning is adopted, and each time the tensioning force is over-tensioned by 5% of the theoretical calculation value; The tensioning is carried out in groups of two transverse fixed length cables at longitudinally symmetrical positions, each group is simultaneously tensioned, and the tensioning sequence is as follows: First time: tensioning from the edge of the main structure to the center of the main structure by groups; Second time: tensioning from the center of the main structure to the edge of the main structure by groups; Third time: tensioning from the edge of the main structure to the center of the main structure by groups.

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