阅读说明：本技术 一种桁索结构索网系统及其索网联动张拉的施工方法 (Cable net system of truss cable structure and cable net linkage tensioning construction method thereof ) 是由 余涛 张汉文 韦晶亮 骆利锋 冯芬芬 于 2021-09-28 设计创作，主要内容包括：一种桁索结构索网系统及其索网联动张拉的施工方法,属于桁索结构索网系统施工技术领域。它包括若干组桅杆索网、中部稳定索网及吊索,每组所述桅杆索网包括斜拉桅杆、若干根桅杆后端拉索以及若干根桅杆前端拉索,所述中部稳定索网将若干根所述桅杆前端拉索连接形成一个整体,所述中部稳定索张拉与所述桅杆索网之间通过张拉形成一个稳定的预应力索网系统,所述预应力索网系统通过吊索为待张拉建筑物提供支撑点。本发明通过将桅杆前端拉索与中部稳定索网联系成整体,再通过索网联动张拉使之与斜拉桅杆共同形成一个稳定的预应力系统,使吊索为屋盖系统提供承受荷载的支撑点,为结构提供受力保障。(A cable net system of a truss cable structure and a cable net linkage tensioning construction method thereof belong to the technical field of cable net system construction of the truss cable structure. The system comprises a plurality of groups of mast cable nets, a middle stabilizing cable net and slings, wherein each group of mast cable nets comprises a cable-stayed mast, a plurality of mast rear-end inhaul cables and a plurality of mast front-end inhaul cables, the middle stabilizing cable net connects the mast front-end inhaul cables into a whole, a stable prestressed cable net system is formed between the middle stabilizing cable stretching and the mast cable nets through stretching, and the prestressed cable net system provides a supporting point for a building to be stretched through the slings. The invention connects the front end guy cable of the mast and the middle stable cable net into a whole, and then the guy cable net is linked and tensioned to form a stable prestress system together with the stayed mast, so that the guy cable provides a load bearing supporting point for a roof system, and provides stress guarantee for the structure.)

1. A cable net system with a truss cable structure is characterized in that: including a plurality of groups mast cable net, middle part stabilizing cable net (4) and hoist cable (5), every group the mast cable net includes cable-stay mast (1), a plurality of mast rear end cable (2) and a plurality of mast front end cable (3), middle part stabilizing cable net (4) will be a plurality of mast front end cable (3) are connected and are formed a whole, middle part stabilizing cable (4) with form a stable prestressing force cable net system through the stretch-draw between the mast cable net, prestressing force cable net system passes through hoist cable (5) and provides the strong point for treating the stretch-draw building.

2. The cable-net linkage tensioning construction method of the truss cable-structure cable-net system according to claim 1, wherein: the method comprises the following steps:

step 1, mast cable net installation: adjusting the cable lengths of the mast rear end cable (2), the mast front end cable (3) and the middle stable cable net (4), and installing according to the pre-marked cable clamp position;

step 2, linkage tensioning of a mast cable net: after the mast cable net is installed in place, selecting a mast rear end cable (2) as an active tensioning cable, selecting a mast front end cable (3) and a middle stable cable net (4) as passive tensioning cables, and tensioning the mast cable net to establish required prestress through the active tensioning mast rear end cable (2) so as to tension the whole mast cable net;

step 3, installation of a sling (5): and after the cable net system is independently tensioned and formed, connecting the lower cable head of the sling (5) with a lower steel structure building in place according to the forming node coordinates of the cable net system and the installation node coordinates of the lower steel structure.

3. The cable-net linkage tensioning construction method of the truss cable-structure cable-net system according to claim 1, wherein the specific process of the step 1 is as follows:

1.1, firstly, erecting a temporary operation platform above a building to be tensioned to realize the installation and accurate positioning of a middle stable cable net (4), the cable penetration of a mast cable net and the cable net fine adjustment;

1.2, fixing the landing end of the middle stable cable net (4) on a ground pier pre-embedded pull rod (6), and simultaneously installing a horizontal cable (7) of the middle stable cable net (4) to ensure the length of the extension section of the middle stable cable net (4);

1.3, connecting one end of a mast rear end stay cable (2) and one end of a mast front end stay cable (3) with a cast steel node arranged at the top end of a cable-stayed mast (1) by using a cable clamp, lengthening the mast front end stay cable (3) and the mast rear end stay cable (2), temporarily binding the mast front end stay cable and the mast rear end stay cable on the cable-stayed mast (1), then hoisting the cable-stayed mast (1) and fixing the cable-stayed mast (1);

1.4, untie mast front end cable (3), mast rear end cable (2) and draw the structure of binding temporarily between mast (1) to one side, draw mast front end cable (3) and mast rear end cable (2), with the other end of mast front end cable (3) and the corresponding nodal connection that sets up on the stable cable net in middle part (4), the other end of mast rear end cable (2) is fixed on the stretch-draw end of the pre-buried pull rod of ground mound (6).

4. The cable-net linkage tensioning construction method of the truss cable-structure cable-net system according to claim 3, wherein the specific process of the step 2 is as follows:

the guy cable (2) at the rear end of the mast is synchronously tensioned in five stages, the shortening amount of the unstressed length of the guy cable is equal during each stage of tensioning, the node displacement is linearly changed during tensioning, the guy cable force and the deformation of the mast cable net are monitored simultaneously during guy cable tensioning, and effective prestress establishment and the influence of prestressed guy cable tensioning on adjacent structures are judged according to the test results of the stress and the deformation in the tensioning stage.

5. The cable-network linkage tensioning construction method of the truss cable-structure cable-network system according to claim 4, wherein in the step 2, before the mast cable-network linkage tensioning construction, force-finding analysis is performed on equivalent pretension of each cable, an initial state of the mast cable-network is designed, distribution and numerical value of the equivalent pretension of the cable are determined, and a zero-state analysis model is established; based on the zero state analysis model, under the combined action of equivalent prestress of each guy cable and the self weight of the structure, the structure reaches an initial state of balance, and the node coordinates of the structure are consistent with the design coordinates.

6. The cable net linkage tensioning construction method of the trussed cable structure cable net system according to claim 4, wherein the concrete process of monitoring each cable force and mast cable net deformation includes mast cable net state tracking, cast steel node bearing capacity analysis and deformation monitoring.

7. The cable-net linkage tensioning construction method of the trussed cable-net system according to claim 6, wherein the mast cable-net state tracking includes monitoring of node coordinates of the mast cable-net and cable forces of the cables.

8. The cable-network linkage tensioning construction method of the truss cable-structure cable-network system according to claim 6, wherein the concrete process of analyzing the bearing capacity of the cast steel node is as follows: and (3) carrying out elastic-plastic finite element analysis on the bearing capacity of the cast steel node, tracking the loading process, obtaining a change curve of deformation and stress along with the loading process, obtaining the ultimate bearing capacity and the node design bearing capacity of the node under load, and comparing the ultimate bearing capacity and the node design bearing capacity with the design internal force and the breaking force of the stay cable to judge whether the cast steel node structure is safe or not.

9. The cable-net linkage tensioning construction method of the truss cable-structure cable-net system according to claim 6, wherein the deformation monitoring and monitoring comprises the following specific processes: tensioning or releasing each cable by adopting a jack, adjusting the horizontal coordinate of the top of the diagonal mast (1), and controlling the cable force to achieve the balance state of the mast cable net system and the overall structure.

Technical Field

The invention belongs to the technical field of construction of a cable net system of a truss cable structure, and particularly relates to a cable net system of a truss cable structure and a cable net linkage tensioning construction method thereof.

Background

The tensioning construction of the truss cable structure and cable net system has construction safety risks, the special form of the structure determines the characteristics of poor structure overall stability, large collapse risk, high installation precision and the like during construction and installation, and the overall stability can be achieved only after the truss and cable net are installed and tensioned to form a whole. In the whole process of installing and tensioning the cable net, the safety of the inclined pulling mast is ensured, the tensioning safety of the cable net is also ensured, and meanwhile, the node positions of the truss and the cable net and the form of the cable net are also ensured, so that the problem is high in difficulty.

Disclosure of Invention

In view of the above problems in the prior art, an object of the present invention is to provide a cable net system of a truss cable structure and a cable net linkage tensioning method thereof, which can ensure the node position of a cable net and stabilize the cable net shape.

The invention provides the following technical scheme: the utility model provides a trussed cable structure cable net system, includes a plurality of groups mast cable net, middle part stabilizing cable net and hoist cable, every group the mast cable net includes cable-stay mast, a plurality of mast rear end cable and a plurality of mast front end cable, middle part stabilizing cable net will a plurality of mast front end cable is connected and is formed a whole, middle part stabilizing cable with form a stable prestressed cable net system through the stretch-draw between the mast cable net, prestressed cable net system provides the strong point for treating the stretch-draw building through the hoist cable.

The cable net linkage tensioning construction method of the cable net system with the truss cable structure is characterized by comprising the following steps of: the method comprises the following steps:

step 1, mast cable net installation: adjusting the cable lengths of the mast rear end cable, the mast front end cable and the middle stable cable net, and installing according to the pre-marked cable clamp position;

step 2, linkage tensioning of a mast cable net: after the mast cable net is installed in place, selecting a rear end cable of the mast as an active tensioning cable, selecting a front end cable of the mast and a middle stable cable net as passive tensioning cables, and tensioning the whole mast cable net by actively tensioning the rear end cable of the mast and establishing a required prestress in the mast cable net;

step 3, installation of a sling: and after the cable net system is independently tensioned and formed, connecting a lower cable head of the sling with a lower steel structure building in place according to the forming node coordinates of the cable net system and the installation node coordinates of the lower steel structure.

The cable-net linkage tensioning construction method of the cable-net system with the truss cable structure is characterized in that the concrete process of the step 1 is as follows:

1.1, firstly, erecting a temporary operation platform above a building to be tensioned to realize the installation and accurate positioning of a middle stable cable net, the cable penetration of a mast cable net and the cable net fine adjustment;

1.2, fixing the landing end of the middle stable cable net on the embedded pull rod of the ground pier, and simultaneously installing the horizontal cable of the middle stable cable net to ensure the length of the extension section of the middle stable cable net;

1.3, connecting one end of a mast rear end stay cable and one end of a mast front end stay cable with a cast steel node arranged at the top end of a cable-stayed mast by using a cable clamp, lengthening the mast front end stay cable and the mast rear end stay cable, temporarily binding the mast front end stay cable and the mast rear end stay cable on the cable-stayed mast, then hoisting the cable-stayed mast and fixing the cable-stayed mast;

1.4, untie the temporary binding structure between the front end guy cable of the mast, the rear end guy cable of the mast and the stayed mast, pull the front end guy cable of the mast and the rear end guy cable of the mast, connect the other end of the front end guy cable of the mast with the corresponding node arranged on the middle stable cable net, and fix the other end of the rear end guy cable of the mast on the tensioning end of the pre-buried pull rod of the ground pier.

The cable-net linkage tensioning construction method of the cable-net system with the truss cable structure is characterized in that the concrete process of the step 2 is as follows:

and (3) synchronously tensioning the guy cable at the rear end of the mast in five stages, wherein the shortening amount of the unstressed length of the guy cable is equal during each stage of tensioning, the node displacement is linearly changed during the tensioning process, the guy cable force of each guy cable and the deformation of the guy cable net of the mast are monitored simultaneously during the guy cable tensioning, and the effective prestress establishment and the influence of the prestressed guy cable tensioning on an adjacent structure are judged according to the test results of the stress and the deformation in the tensioning stage.

The cable-network linkage tensioning construction method of the cable-network system of the truss cable structure is characterized in that in the step 2, before mast cable-network linkage tensioning construction, force searching analysis is needed to be carried out on equivalent pretension of each cable, the initial state of the mast cable-network is designed, distribution and numerical values of the equivalent pretension of the cables are determined, and a zero-state analysis model is established; based on the zero state analysis model, under the combined action of equivalent prestress of each guy cable and the self weight of the structure, the structure reaches an initial state of balance, and the node coordinates of the structure are consistent with the design coordinates.

The cable net linkage tensioning construction method of the cable net system of the truss cable structure is characterized in that the concrete process of monitoring the cable force of each inhaul cable and the deformation of the mast cable net comprises the steps of mast cable net state tracking, cast steel node bearing capacity analysis and deformation monitoring.

The cable-net linkage tensioning construction method of the cable-net system of the truss cable structure is characterized in that the mast cable-net state tracking comprises monitoring of node coordinates of the mast cable-net and cable force of each cable.

The cable-net linkage tensioning construction method of the truss cable-net structure cable-net system is characterized in that the concrete process of analyzing the bearing capacity of the cast steel node is as follows: and (3) carrying out elastic-plastic finite element analysis on the bearing capacity of the cast steel node, tracking the loading process, obtaining a change curve of deformation and stress along with the loading process, obtaining the ultimate bearing capacity and the node design bearing capacity of the node under load, and comparing the ultimate bearing capacity and the node design bearing capacity with the design internal force and the breaking force of the stay cable to judge whether the cast steel node structure is safe or not.

The cable-net linkage tensioning construction method of the cable-net system with the truss cable structure is characterized in that the specific deformation monitoring process is as follows: and tensioning or releasing each cable by adopting a jack, adjusting the horizontal coordinate of the top of the diagonal mast, and controlling the cable force to achieve the balance state of the mast cable net system and the whole structure.

By adopting the technology, compared with the prior art, the invention has the following beneficial effects:

1) according to the invention, the front end stay cable of the mast and the middle stable cable net are connected into a whole, and then the stay cable net and the inclined-pulling mast are jointly formed into a stable prestress system through linkage tensioning of the cable net, so that the stay cable provides a load bearing supporting point for a roof system, and stress guarantee is provided for the structure;

2) according to the invention, the cable net linkage is formed by actively tensioning the rear end cable of the mast and drawing the passive tensioning cable, and the prestress is established on the cable net of the mast, so that the stress of the whole space structure is balanced; connecting a lower cable head of the sling with the lower steel structure building in place, controlling the precision and the position of a middle stabilizing cable, ensuring that the structural quality is effectively controlled and obtaining remarkable effect;

3) the invention effectively controls the spatial position accuracy of the net cables through cable-net linkage tensioning, ensures the node position of the cable-net system and the form of the stable cable net in the middle, and simultaneously reduces the risk caused by poor integral stability of the structure during construction and installation.

Drawings

FIG. 1 is a schematic structural view of a cable net system of a truss cable structure according to the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic view of a node on a central stabilizing web in accordance with an embodiment of the present invention.

In the figure: 1. a diagonal mast is pulled; 2. a back end guy cable of the mast; 3. a front end guy cable of the mast; 4. a middle stabilizing cable net; 5. a sling; 6. pre-burying a pull rod in the ground pier; 7. horizontal cables.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.

Example (b):

referring to fig. 1-2, a cable net system of a truss structure is composed of four sets of mast cable nets, a middle stabilizing cable net 4 and a sling 5. Each group of mast cable nets comprises a cable-stayed mast 1, two mast rear-end cables 2 and six mast front-end cables 3, all the mast front-end cables 3 are connected into a whole through a middle stabilizing cable net 4, the middle stabilizing cable net 4 and four groups of cable-stayed masts 1 jointly form a stable prestress system through tensioning, and finally a middle supporting point is provided for the truss steel roof through the cables 5.

The mast stayed-cable net provides an elastic supporting point for the truss steel roof, the bottom of the stayed mast 1 is hinged with the base to form a movable support structure, and prestress is established in the mast cable net to ensure the inclination balance state of the mast and determine the safety of the whole structure and the performance of stress deformation. The base structure can be seen in patent numbers: 202020034401.X, patent name: the rotatable base unit is disclosed in the patent document "a rotatable base unit of a lattice-structured tilt mast".

A cable net linkage tensioning construction method of a cable net system of a truss cable structure comprises the following steps:

1) installing a cable net: two mast rear end guys 2, six mast front end guys 3 and a middle stable guy net 4 of the mast guy net are installed after the length of the guy and the mark position of the guy clip are adjusted according to the manufacturing error of the length of the guy, the environmental temperature deviation, the installation error and the like.

The specific implementation sequence is as follows:

firstly, an arc temporary operating platform is erected above a truss steel roof to solve the problems of installation and accurate positioning of a middle stable cable net 4, cable penetration of a mast cable net and fine adjustment of the cable net.

The ground end of the middle stabilizing cable net 4 is fixed on the ground pier pre-embedded pull rod 6, and meanwhile, the horizontal cable 7 of the middle stabilizing cable net 4 is installed, so that the length of the extension section of the middle stabilizing cable net 4 is ensured.

Two mast rear end guys 2 and six mast front end guys 3 are connected with cast steel nodes at the top end of the cable-stayed mast 1 by using cable clamps, the front end guys and the rear end guys are properly lengthened, temporarily bound on the cable-stayed mast 1, and the cable-stayed mast 1 is hoisted and fixed.

The front end guy cable 3 of the traction mast and the rear end guy cable 2 of the traction mast are symmetrically stretched to prevent the inclined traction mast 1 from being subjected to overlarge eccentric load and enable the structure to gradually become a stable stress system, the front end guy cable 3 of the mast is connected with each node of the middle stable cable net 4, and the rear end guy cable 2 of the mast is fixed on the tensioning end of the ground pier pre-embedded pull rod 6.

2) And (3) cable net linkage tensioning: after the mast cable net and the middle stable cable net 4 are installed in place, the mast rear end guy cable 2 is selected as an active stretching guy cable, the mast front end guy cable 3 and the middle stable cable net 4 are selected as passive stretching guy cables, namely: the required prestress is established on the mast cable net by actively tensioning the mast rear end inhaul cables 2 of the four diagonal masts 1.

The guy cable 2 at the rear end of the mast is synchronously tensioned in five stages, namely 0% (active guy pretension) → 20% → 40% → 60% → 70% → 100% (tension forming), the shortening of the unstressed length of the guy cable is equal during each stage of tensioning, and the node displacement is linearly changed in the tensioning process. During cable tensioning, cable force and cable net deformation are monitored simultaneously, the test results of stress and deformation in the tensioning stage are the main basis for judging the effective prestress establishment and the influence of prestress cable tensioning on adjacent structures, and the cable force is mainly controlled and the deformation is assisted.

3) And (3) installation of a sling: after the cable net system is independently tensioned and formed, connecting the lower cable head of the sling 5 with the lower truss steel roof in place according to the forming node coordinates of the cable net system and the lower steel structure mounting node coordinates;

wherein, the construction main points of cable net system include:

1. before the linkage tensioning construction of the mast cable net, force finding analysis is carried out on the equivalent pretension of each guy cable, the initial state of the mast cable net is designed, the distribution and the numerical value of the equivalent pretension of the guy cables are determined, and a zero state analysis model is established; based on a zero state analysis model, under the combined action of equivalent prestress of each stay cable and the self weight of the structure, the structure reaches an initial state of balance, and the node coordinates of the structure are consistent with the design coordinates;

2. determining the temperature of the mast cable net system at the initial cable tensioning time to be 20+2 ℃, and determining that the reasonable tensioning force meets the requirement of the initial state;

3. and after the mast cable net is singly stretched and formed, carrying out shape change state formation of the mast cable net. Namely, determining a reasonable installation position of the mast cable net, and ensuring that the shape and the position of the tensioned mast cable net are consistent with the design;

4. through the analysis of the tensioning process, the mast cable net state in the process is mastered, and the node coordinates and the cable force of the inhaul cable are tracked;

5. carrying out elastic-plastic finite element analysis on the bearing capacity of the cast steel node, tracking the loading process, obtaining a change curve of deformation and stress along with the loading process, obtaining the ultimate bearing capacity and the node design bearing capacity of the node under load, and comparing the ultimate bearing capacity and the node design bearing capacity with the design internal force and the breaking force of a stay cable to judge whether the cast steel node structure is safe or not;

6. and monitoring deformation, namely tensioning or releasing the stay cable by adopting a jack, adjusting the horizontal coordinate of the top of the cable-stayed mast 1, and controlling the cable force to achieve the optimal shape of a cable-stayed network system and the overall structure.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.