CN113463763A - Construction method of super-long cantilever cable bearing grid structure - Google Patents
Construction method of super-long cantilever cable bearing grid structure Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
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- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/32—Arched structures; Vaulted structures; Folded structures
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- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
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- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
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- E04H3/10—Buildings or groups of buildings for public or similar purposes; Institutions, e.g. infirmaries or prisons for meetings, entertainments, or sports
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Abstract
The invention relates to the technical field of prestressed steel structure construction, and discloses a construction method of an ultralong cantilever cable bearing grid structure. The method comprises the following steps of determining the laying position of a circumferential cable, and setting up an installation operation platform of a cable clamp; erecting an installation operation platform of a radial cable; paving the annular cables and the radial cables; connecting one end of a radial cable with a cable clamp, and connecting the other end of the radial cable with a lifting tool; arranging a supporting jig frame of the grid roof; installing a grid roof; installing a temporary cable-stayed structure while installing the grid roof; dismantling the supporting jig frame of the outer ring in sections; hoisting the cable system structure integrally; the radial cables are stretched in an integral grading manner, and the grid roof is automatically separated from the supporting jig frame of the outer ring; installing a V-shaped stay bar; and (5) removing the temporary cable-stayed structure, and unloading the supporting jig frame to finish the construction of the cable bearing grid structure. The flexible member of the invention is integrally lifted, integrally and synchronously tensioned, and has high construction efficiency and good tensioning effect.
Description
Technical Field
The invention relates to the technical field of prestressed steel structure construction, in particular to a construction method of an ultra-long cantilever cable bearing grid structure.
Background
The applicable places of the steel structure can be replaced by prestressed steel structures to improve the structural performance and reduce the steel consumption, and particularly, the economic benefit is more obvious under the conditions of large span and load. At present, the prestressed steel structure is widely applied to the field of house building structures, such as large public buildings of stadiums, exhibition centers, theaters, markets, hangars, terminal buildings and the like.
In large public buildings with large span, a prestressed truss or a truss string is mostly used as a structural support of a roof, and the roof is mostly composed of an upper chord of a rigid member, a lower flexible inhaul cable and a vertical support rod connected with the middle part. Especially the spoke type ring steel structure, belongs to a new type hybridization structure, the lower flexible inhaul cable part of the present new type cable bearing grid structure is composed of ring inhaul cables and radial inhaul cables, and the structures can be applied with prestress by stretching the inhaul cables.
When the cable force difference of the radial inhaul cable is not large, the prestress applying efficiency by adopting the method of tensioning the annular inhaul cable is higher; however, when the circumferential stay cable is long and the difference between the cable forces of the radial stay cables is large, the method of stretching the circumferential stay cable is adopted to apply prestress, the cable force is not uniform after the stretching is finished, an ideal effect cannot be achieved, and the prestress can be applied only by adopting the method of stretching the radial stay cable to form the structure; and because the span is great, the cantilever is longer, in the work progress of reality, mostly be the segmentation promotion, stretch-draw in batches to avoid the cantilever arm of room lid front end to warp downwards. However, the construction process is complicated, the operation difficulty is high, the potential safety hazard is large, the stretch-draw forming efficiency is low, the effect is poor, and the roof deformation is easy to occur.
Disclosure of Invention
The construction method of the ultralong cantilever cable bearing grid structure provided by the invention has the advantages that the flexible member is integrally lifted, the integral synchronous tensioning is realized, the construction efficiency is high, and the tensioning effect is good.
The technical problem to be solved is that: in the existing construction process of a cable bearing grid structure, the cable bearing grid structure is mostly lifted in sections and tensioned in batches, the construction process is complex, the operation difficulty is high, the potential safety hazard is large, the tensioning forming efficiency is low, the effect is poor, and the deformation of the roof is easy to occur.
In order to solve the technical problems, the invention adopts the following technical scheme:
the construction method of the overlong cantilever cable bearing grid structure specifically comprises the following steps:
step one, design preparation:
adopting finite element analysis software to establish a structural integral calculation model, carrying out simulation analysis at each construction stage, giving the configuration and stress of the structure at each construction stage, and planning the construction stage;
determining the laying position of the circumferential cable, and setting up an installation operation platform of the cable clamp;
step three, building an installation operation platform of the radial cable;
step four, paving the circumferential cables;
fifthly, paving the radial cables; connecting one end of a radial cable with a cable clamp, and connecting the other end of the radial cable with a lifting tool;
step six, arranging a supporting jig frame of the grid roof;
seventhly, installing a grid roof;
step eight, installing a temporary cable-stayed structure while installing the grid roof;
step nine, dismantling the supporting jig frame of the outer ring in sections;
step ten, hoisting the cable system structure integrally;
installing a lifting tool, integrally lifting the annular cable, the radial cable and the cable clamp which are assembled on the ground in place, and installing and fixing;
step eleven, stretching the radial cables integrally in a grading manner, and automatically separating the grid roof from the supporting jig frame of the outer ring;
step twelve, installing a V-shaped stay bar;
lifting the diagonal brace in place, and fixedly connecting two ends of the diagonal brace with a cable clamp on the circumferential cable and a cantilever end of the grid roof respectively;
and step thirteen, dismantling the temporary cable-stayed structure, unloading the support jig frame and completing construction of the cable-supported grid structure.
The construction method of the overlong cantilever cable bearing grid structure further comprises the steps that the cable bearing grid structure comprises an upper-chord single-layer grid roof, a lower-chord cable system structure, a vertical stay bar and a V-shaped stay bar, wherein the middle part of the vertical stay bar is connected with the grid roof and the cable system structure; the cable system structure comprises an annular cable and a radial cable, wherein one end of the radial cable is hinged with the outer ring beam, and the other end of the radial cable is hinged with a cable clamp on the annular cable; the top end of the vertical stay bar is connected with the grid roof, and the bottom end of the vertical stay bar is fixedly connected with the radial cable; the V-shaped supporting rods are V-shaped supporting structures formed by symmetrically arranging two inclined supporting rods and are arranged in parallel along the circumferential direction of the building, the bottom ends of the V-shaped supporting rods are fixedly connected with cable clamps on circumferential cables, and the top ends of the V-shaped supporting rods extend towards the inner side of the building in an inclined mode and are fixedly connected with the grid roof.
The construction method of the overlong cantilever cable bearing grid structure further comprises the following steps:
4.1, laying the lower layer guy cable of the annular cable on the stand;
4.2, installing a cable clamp, and connecting and fixing the lower layer of inhaul cable with the cable clamp;
4.3, connecting adjacent cable sections into a whole inhaul cable through a connector;
and 4.4, laying the upper layer inhaul cable of the annular cable on the stand, and connecting and fixing the upper layer inhaul cable with the cable clamp according to the steps to complete assembly of the annular cable and fixation of the cable clamp.
The construction method of the overlength cantilever cable bearing grid structure further comprises the step seven of splicing the radial beams on the ground, integrally hoisting a single beam, installing the vertical support rods on the radial beams on the ground and hoisting the vertical support rods in place along with the radial beams; the temporary supporting jig frame is arranged at the end part of the radial beam and the middle part of the secondary structure, the secondary structure between adjacent radial main beams is hoisted according to the sequence from outside to inside, the secondary structure is supported on the temporary supporting jig frame, the end part of the radial beam and the outer ring beam are fixed in a pin joint mode, the adjacent secondary structures are connected in sequence, and the reinforcing ring beam and the inner ring beam are formed.
The construction method of the overlength cantilever cable bearing grid structure further comprises the step eight of assembling 5 trusses on the grid roof, and starting to install and stretch the temporary diagonal draw structures, wherein the temporary diagonal draw structures are arranged above the grid roof and are in one-to-one correspondence with the V-shaped stay bars; the specific setting process comprises the following steps:
8.1, when the grid roof is spliced on the ground, fixing the supporting upright stanchion above the grid roof, and taking place along with the hoisting of the grid roof;
8.2, installing a front-end diagonal draw bar;
8.3, mounting a rear end stay cable.
The construction method of the overlong cantilever cable bearing grid structure further comprises the following steps that the temporary cable-stayed structure comprises a supporting vertical rod, a cable-stayed rod and a cable-stayed cable, wherein the cable-stayed rod is positioned on one side of a cantilever, and the cable-stayed cable is positioned on one side far away from the cantilever; the bottom end of the supporting vertical rod is fixedly connected with the upper surface of the grid roof, the central axis of the supporting vertical rod and the circumferential cable are positioned in the same vertical plane, the diagonal draw bars are arranged in pairs and symmetrically arranged in a V shape, the top end of the diagonal draw bar is fixedly connected with the top of the supporting vertical rod, the bottom end of the diagonal draw bar is fixedly connected with the cantilever end of the grid roof, and the designed installation positions of the two diagonal draw bars and the V-shaped stay bar are opposite up and down; the top end of the stay cable is hinged with the top of the supporting upright rod, and the bottom end of the stay cable is connected with a tensioning tool fixed on the outer ring beam.
The construction method of the overlength cantilever cable bearing grid structure further comprises the step nine of sequentially dismantling the supporting jig frames of the outer ring clockwise or anticlockwise after the grid structure is assembled.
The construction method of the overlong cantilever cable bearing grid structure further comprises the following construction process of the tenth step:
10.1, installing a lifting tool;
10.2, synchronously lifting the whole cable system structure to a corresponding elevation position;
10.3, connecting the annular cable and the radial cable with the vertical stay bars through cable clamps respectively;
and 10.4, installing a tensioning tool.
The construction method of the ultra-long cantilever cable bearing grid structure further comprises the following steps that cable heads of the radial cables are in pin joint with connecting lug plates on outer ring beams, tensioning tools are arranged on adjusting screws of the cable heads, and the outer ring beams on two sides of the connecting lug plates are symmetrically provided with the tensioning lug plates; the tensioning tool comprises a bearing support, a jack and a steel bar, wherein a through hole is formed in the middle of the bearing support, an adjusting screw rod penetrates through the through hole, the steel bar is symmetrically arranged on the bearing support on two sides of the adjusting screw rod, one end of the steel bar penetrates through the bearing support to be rotatably connected with tensioning ear plates on two sides of an outer ring beam, and the jack penetrates through the other end of the steel bar.
The construction method of the ultralong cantilever cable bearing grid structure further comprises the following specific tensioning process in the eleventh step:
11.1, simultaneously tensioning the radial cables integrally to 30% of a design value;
11.2, simultaneously integrally tensioning the radial cables to 50% of a design value, and then opening a welding seam between the cable bearing grid structure and the support jig frame;
11.3, simultaneously tensioning the radial cables integrally to 70% of a design value;
11.4, simultaneously tensioning the radial cables integrally to 100% of a design value, and then removing all tensioning tools.
Compared with the prior art, the construction method of the overlong cantilever cable bearing grid structure has the following beneficial effects:
in order to increase the overhanging length of the roof, the overhanging part at the front end of the ring cable is additionally provided with the V-shaped stay bar, the V-shaped stay bar is mainly used for supporting the overhanging part component at the front end of the ring cable and needs to be installed after tensioning is finished, and if the V-shaped stay bar is installed before tensioning, the V-shaped stay bar is tensioned when prestress is applied, so that the front end of the roof is deformed downwards, and the construction quality is directly influenced.
The flexible member of the cable system structure is spliced and connected on the ground, integrally lifted, installed in place and integrally and synchronously tensioned in a grading manner, so that the tensioning forming efficiency is higher, the construction amount in high altitude is greatly reduced, and the construction efficiency is improved.
The construction method of the ultra-long cantilever cable bearing grid structure of the present invention is further explained with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of an extra-long cantilever cable-supported lattice structure according to the present invention;
FIG. 2 is a schematic detail of a cable-supported lattice structure;
fig. 3 is a schematic view of the temporary cable-stayed structure installed in the eighth step;
fig. 4 is a schematic structural diagram of the tensioning tool in the tenth step.
Reference numerals:
1-a grid roof; 11-outer ring beam; 12-inner ring beam; 13-a radial beam; 14-reinforcing ring beam; 2-a cable system structure; 21-a circumferential cable; 22-radial cables; 23-a cable clamp; 24-vertical struts; 3-V-shaped struts; 41-supporting vertical rods; 42-diagonal draw bars; 43-stay cables; 51-a cable head; 52-adjusting screw; 61-connecting ear plates; 62-tensioning the ear plate; 7-a force bearing support; 8-steel bar.
Detailed Description
As shown in fig. 1, the construction method of the cable-supported lattice structure of the ultralong cantilever of the present invention includes the steps of arranging the cable-supported lattice structure on a vertical support main body, wherein the vertical support main body is an annular truss structure formed by enclosing rectangular tube V-shaped truss columns, large arch trusses and truss ring beams; the cable-supported grid structure is a building roof system and comprises an upper-chord single-layer grid roof 1, a lower-chord cable system structure 2, vertical support rods 24 and V-shaped support rods 3, wherein the middle parts of the vertical support rods are connected with the grid roof 1 and the cable system structure 2.
As shown in fig. 2, the lattice roof 1 is a single-layer planar lattice structure, and includes an outer ring beam 11, an inner ring beam 12 and a radial beam 13, the radial beam 13 is a box beam with a uniform cross section, one end of the radial beam is hinged to the outer ring beam 11, the other end of the radial beam extends into the ring and is fixedly connected with the inner ring beam 12 to form a ring-shaped cantilever, and reinforcing ring beams 14 are arranged on the radial beam 13 at intervals and are arranged with the radial beam 13 to form a lattice structure; the outer ring beam 11 and the inner ring beam 12 are all box-shaped beams with equal sections.
The cable system structure 2 comprises an annular cable 21 and a radial cable 22, wherein the annular cable 21 is a cable bundle consisting of 6 cables, the cables are bound and fixed through a cable clamp 23, one end of the radial cable 22 is hinged with the outer ring beam 11, and the other end of the radial cable 22 is hinged with the cable clamp 23 on the annular cable 21; the top end of the vertical stay bar 24 is connected with the grid roof 1, and the bottom end is connected and fixed with the radial cable 22. V-arrangement vaulting pole 3 is the V-arrangement bearing structure that two diagonal braces symmetries were arranged and are constituteed, arranges side by side along the building hoop, and 3 bottoms of V-arrangement vaulting pole are connected fixedly with the cable clip 23 on the hoop cable 21, and the top extends and is connected fixedly with net roof 1 towards the inboard slope of building, and the contained angle of V-arrangement vaulting pole 3 place plane and vertical face is 25~ 30, and the horizontal distance between 3 tops of V-arrangement vaulting pole and the interior ring beam 12 is not more than 2 m.
Now, a cable-supported lattice structure of an ultra-long cantilever and a construction method thereof will be described by taking a construction project of a stadium in a certain market as an example. The plane of the roof of the stadium is approximately circular, the south-north direction is about 260m, the east-west direction is about 230m, the east-direction overhanging length of the grandstand awning is 36m, the west-direction overhanging length is 47m, the south-north-direction overhanging length is 30m, and the highest position of the roof is 47 m; the cage of the stand adopts a large-opening spoke type cable-supported grid structure, the radial cables 22 account for 38 trusses, the radial cables 22 with the diameter D140 account for 20 trusses, and the radial cables 22 with the diameter D122 account for 18 trusses; the annular cable 21 is only one circle, and 6 × D125 is adopted; the radial inhaul cable adopts a high-vanadium coating cable, and the ring cable adopts a high-quality sealing cable.
The construction method of the overlong cantilever cable bearing grid structure specifically comprises the following steps:
step one, design preparation:
the method comprises the steps of establishing a structural integral calculation model by adopting finite element analysis software such as ANSYY or Midas, carrying out simulation analysis at each construction stage, giving the configuration and stress of the structure at each construction stage, dividing the whole construction process into 10 stages, carrying out simulation calculation on each construction process according to the construction sequence, and obtaining the guy cable force, the structural displacement, the steel structure stress and the jig support force of each state.
The construction simulation is divided into the following stages:
1.1, assembling the grid structure (except for the lower inclined stay bar of the overhanging grid structure);
1.2, finishing the installation of the upper inclined-pulling structure;
1.3, tensioning an upper stay cable 43;
1.4, removing a part of the supporting jig frame inside, and lifting the stay cable in place;
1.5, stretching the first stage by 30% through a stay cable;
1.6, tensioning the second stage by 50% through a stay cable;
1.7, tensioning a third stage by using a stay rope to reach 70 percent;
1.8, stretching a fourth stage by 100 percent through a stay cable;
1.9, installing an oblique V-shaped support;
and 1.10, removing the support jig frame and the upper inclined pulling structure.
Step two, determining the laying position of the circumferential cable 21, and setting up an installation operation platform of the cable clamp 23;
after the construction of the stand is completed, an installation operation platform of a cable clamp 23 of the circumferential cable 21 is erected on the stand, and the platform is located at a projection position right below the circumferential cable 21 and is a steel structure supporting platform.
In this embodiment, a platform of 3 meters × 3 meters is erected by using i-beams, the circumferential cables 21 and the cable clamps 23 are 38 in total, and 38 cable clamps 23 are required to be erected to support the platform.
Step three, setting up an installation operation platform of the radial cable 22;
after the installation of the peripheral structure of the steel structure is finished, an operation platform for installing and tensioning the cable head 51 of the radial cable 22 is erected, is positioned at the node of the radial cable 22 of the peripheral steel structure, and comprises support hangers hung on the outer ring beams 11 at two sides of the node of the radial cable 22 and a platform plate paved between the two support hangers.
In this example, the stage size is 2.4 m × 1.8 m × 0.9m, requiring: the height of the guard bars is 1.2m, the height of the guard bars is 500mm below the joint of the cable head 51, the guard bars can bear 2t of vertical force, and the shelf board is fully paved.
Step four, paving the circumferential cables 21;
the method specifically comprises the following steps:
4.1, laying 3 pull cables on the lower layer of the annular cable 21 on a stand; in the process, the mark points on each stay cable body are in one-to-one correspondence with the corresponding axes, namely the mark points on the cable bodies are aligned with the placing positions of the annular cables 21 positioned and paid off on the cable clamp 23 installation operating platform;
the weight of the circumferential cable 21 used in the engineering of the embodiment is about 90kg per linear meter, the length is about 150m at most, and the weight of a single cable is about 14 t;
4.2, installing a cable clamp 23, and connecting and fixing the 3 inhaul cables on the lower layer with the cable clamp 23; in the installation process, the center line of the cable clamp 23 corresponds to the mark points on the cable body of the inhaul cable one by one, and meanwhile, the pre-tightening force of the high-strength bolt is guaranteed;
4.3, connecting adjacent cable sections into a whole inhaul cable through a connector;
4.4, laying 3 draglines on the upper layer of the annular cable 21 on the stand, and connecting and fixing the upper layer of the annular cable 21 with the cable clamp 23 according to the steps to complete the assembly of the annular cable 21 and the fixation of the cable clamp 23; in the same installation process, the center line of the cable clamp 23 corresponds to the mark points on the cable body of the inhaul cable one by one, and meanwhile, the pretightening force of the high-strength bolt is guaranteed.
The prestressed inhaul cable and the accessories are prevented from collision and extrusion as much as possible in the transportation, hoisting and transportation processes.
Before the inhaul cable and accessories are laid and used, the inhaul cable and the accessories are properly stored in a dry and flat place, the lower side of the inhaul cable is provided with a skid, and the upper side of the inhaul cable is provided with a rainproof measure to avoid corrosion of materials; avoiding the damage caused by the smashing, pressing and contact electric welding operation.
The galvanized protection that this project cable protection adopted. During the construction process of lifting the radial cables 22, because the radial cables 22 are mutually staggered, friction is generated between the radial cables 22, and in order to avoid damage to a coating, a layer of thin felt and a plastic belt protective layer are wound outside the cables when the steel cables leave a factory. After the protection layer is lifted integrally, the upper radial cable 22 clamp is removed before being installed.
Step five, paving the radial cables 22;
after the annular cable 21 is assembled, the radial cable 22 is laid, one end of the radial cable 22 is connected with the cable clamp 23, the other end of the radial cable is connected with the lifting tool, the ground connection of the whole cable system structure 2 is completed, the connection in sections in high altitude is avoided, potential safety hazards are reduced, the operation is simple and safe, and the construction efficiency is high.
Step six, arranging a supporting jig frame of the grid roof 1;
seventhly, installing a grid roof 1;
assembling and connecting the inner ring beam 12, the radial beam 13 and the reinforcing ring beam 14 on the ground, then lifting the inner ring beam to an installation position in a subsection mode, erecting the inner ring beam on a temporary support jig, fixing the end part of the radial beam 13 and the outer ring beam 11 in a pin joint mode, and connecting the grid roof 1 of the adjacent section in sequence;
the radial beams 13 are spliced on the ground, a single beam is integrally hoisted, and the vertical support rods 24 are arranged on the radial beams 13 on the ground and are hoisted in place along with the radial beams 13; the temporary supporting jig frame is arranged at the end part of the radial beam 13 and the middle part of the secondary structure, the secondary structure between adjacent radial main beams is hoisted according to the sequence from outside to inside, the secondary structure is supported on the temporary supporting jig frame, the end part of the radial beam 13 is fixedly connected with the outer ring beam 11 in a pin joint mode, the adjacent secondary structures are connected in sequence, the reinforcing ring beam 14 and the inner ring beam 12 are formed, and the secondary structure is hoisted by adopting a natural section and assembled on the supporting jig frame.
The single-layer grid on the upper chord of the roof is used as a cantilever structure and is hinged with the outer ring beam 11, so that the bending moment of the radial cantilever component at the ring beam is zero, and the radial beam 13 on the upper chord is made into a box beam with a uniform section, thereby effectively saving the steel consumption; meanwhile, the weight of the upper-chord single-layer grid is completely borne by the lower-chord cable system, the upper-chord single-layer grid is similar to a transient system before prestress is not applied to the lower-chord cable system, deformation is large, and the upper-chord single-layer grid is mainly supported by a temporary support jig frame during construction.
Step eight, installing a temporary cable-stayed structure while installing the grid roof 1;
after 5 pieces of assembled grid roof 1, the temporary diagonal-pulling structures are installed and tensioned, and the temporary diagonal-pulling structures are arranged above the grid roof 1 and correspond to the V-shaped support rods 3 one by one.
The temporary cable-stayed structure comprises a supporting vertical rod 41, a cable-stayed rod 42 positioned at one side of the cantilever and a cable-stayed cable 43 positioned at one side far away from the cantilever; the bottom end of the supporting vertical rod 41 is fixedly connected with the upper surface of the grid roof 1 and is lifted and installed together with the grid roof 1, the central axis of the supporting vertical rod 41 and the circumferential cables 21 are positioned in the same vertical plane, the diagonal draw bars 42 are arranged in pairs and symmetrically arranged in a V shape, the top end of the supporting vertical rod 41 is fixedly connected with the top of the supporting vertical rod, the bottom end of the supporting vertical rod is fixedly connected with the cantilever end of the grid roof 1, and the two diagonal draw bars 42 are opposite to the designed installation positions of the V-shaped stay bars 3 from top to bottom; the top end of the stay cable 43 is hinged with the top of the supporting upright rod 41, and the bottom end is connected with a tensioning tool fixed on the outer ring beam 11, as shown in fig. 3.
The specific setting process comprises the following steps:
8.1, when the grid roof 1 is spliced on the ground, fixing the supporting upright rods 41 above the grid roof 1, and taking place along with the hoisting of the grid roof 1;
8.2, installing a front-end diagonal draw bar 42;
8.3, installing a rear end stay cable 43;
since the influence of each of the other members is small when the cable-stayed structure is tensioned, the cable-stayed structure can be individually tensioned after the cable-stayed structure is installed.
The tensioning temporary diagonal structure has the following functions: the downwarping of the overhanging section is avoided, and after the lower part cable system is stretched, the overhanging section of the roof can be lifted for the second time without jacking, so that the V-shaped stay bar 3 is convenient to install.
Step nine, dismantling the supporting jig frame of the outer ring in sections;
the supporting jig frame of the outer ring only plays a role in supporting and positioning when the components are assembled, the task is completed after the grid structure is assembled, the supporting jig frame can be disassembled, the supporting jig frame is just positioned on the axis position of the radial cable 22, the installation of the radial cable 22 can be influenced, and the supporting jig frame can be sequentially disassembled clockwise or anticlockwise.
Step ten, hoisting the cable system structure 2 integrally;
installing a lifting tool, integrally lifting the annular cable 21, the radial cable 22 and the cable clamp 23 which are assembled on the ground to a proper position, and installing and fixing; the specific construction process comprises the following steps:
10.1, installing a lifting tool, wherein the lifting tool can specifically use a lifting device disclosed in the 'lifting method of a flexible member lifting device' with the application number of 2014103404577; the whole synchronous lifting can be carried out on the cable system structure 2 according to the lifting method described in the patent;
10.2, synchronously lifting the whole cable system structure 2 to a corresponding elevation position;
10.3, connecting the annular cable 21 and the radial cable 22 with a vertical support rod 24 through cable clamps 23 respectively;
10.4, installing a tensioning tool;
as shown in fig. 4, the cable head 51 of the radial cable 22 is pin-connected with the connecting lug plate 61 on the outer ring beam 11, the adjusting screw 52 of the cable head 51 is provided with a tensioning tool, and the outer ring beam 11 on both sides of the connecting lug plate 61 is symmetrically provided with tensioning lug plates 62. The tensioning tool comprises a bearing support 7, a jack and a steel bar 8, wherein a through hole is formed in the middle of the bearing support 7, an adjusting screw 52 penetrates through the through hole, the steel bar 8 is symmetrically arranged on the bearing support 7 on two sides of the adjusting screw 52, one end of the steel bar penetrates through the bearing support 7 to be rotatably connected with tensioning lug plates 62 on two sides of the outer ring beam 11, and the jack penetrates through the other end of the steel bar.
When the tensioning tool is installed, the centroid of the tensioning tool is overlapped with the axis of the radial cable 22, so that the prestressed cable cannot be eccentric during tensioning.
According to different maximum tensile forces to be applied, jacks with different specifications can be selected to be matched with the steel bar 8 for use, for example, in the project of the embodiment, when the radial cable 22 with the diameter of D122 is tensioned, 2 jacks of 100t are selected to be matched with the steel bar 8 with the diameter of 80mm, the bearing capacity of the tensioning tool can reach 3000KN, and the maximum tensile force is 1600 KN; when the tensioning tool is used for tensioning the radial cable 22 with the diameter D140, 2 250t jacks are selected, the steel bar 8 with the diameter of 100mm is matched, the bearing capacity of the tensioning tool can reach 5000KN, and the maximum tensioning force is 3000 KN.
Step eleven, stretching the radial cables 22 integrally in a grading manner, and automatically separating the grid roof 1 from the supporting jig frame of the outer ring;
in the tensioning process, after the oil pump starts to supply oil normally, pressurization is started, and during tensioning, the oil supply speed is controlled, and the oil supply time is not less than 0.5 min.
In the process of tensioning the prestressed steel cable, the elevation position of the circumferential cable 21 changes along with the tension, the grid roof 1 deforms along with the tension, and the structural deformation and the tension complement each other. Therefore, in combination with the construction simulation analysis calculation result, in the tensioning process, the total station is adopted to monitor the vertical deformation of the grid roof 1 in the construction process. An initial value is measured before tensioning, and then the measurement is carried out once after each stage of tensioning is completed.
After each stage of tensioning is finished and the cable force is stably deformed, comparing the monitoring data with a theoretical calculation value, and if the result is within an allowable range, tensioning the next stage; and if the deviation of the monitored data and the theoretical value exceeds the design allowable range, temporarily stopping tensioning, searching the reason, reporting to a design institute for rechecking, and continuing tensioning after the reason is found and the following adjustment and control measures are formulated.
The specific tensioning process comprises the following steps:
11.1, simultaneously tensioning the radial cables 22 integrally to 30% of a design value;
11.2, simultaneously tensioning the radial cables 22 integrally to 50% of a design value;
according to the construction simulation calculation result, most of the roof and the supporting jig frame are separated when the third stage is stretched by 70%, and the welding seam between the supporting jig frame and the roof is opened before the third stage is stretched by 70%;
11.3, simultaneously tensioning the radial cables 22 integrally to 70% of a design value;
11.4, simultaneously and integrally tensioning the radial cables 22 to 100 percent of the design value, then removing all tensioning tools,
the general tension principle is to keep the balanced and orderly increase and change of the cable force and the deformation energy of the structure in the tension process, and particularly the process of separating the grid structure from the supporting bed-jig is well controlled in the tension classification.
Step twelve, installing a V-shaped stay bar 3;
the diagonal brace is lifted to the right position, and two ends of the diagonal brace are respectively fixedly connected with a cable clamp 23 on the circumferential cable 21 and a cantilever end of the grid roof 1;
and step thirteen, dismantling the temporary cable-stayed structure, unloading the support jig frame and completing construction of the cable-supported grid structure.
After the V-shaped stay bar 3 is installed in place, the stable fixed cable of roof water can be installed according to the construction design requirement, then the temporary cable-stayed structure is dismantled, the supporting jig frame is uninstalled, the subsequent ending is carried out, and the construction of the cable bearing grid structure is completed.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. The construction method of the overlong cantilever cable bearing grid structure is characterized by comprising the following steps of: the method specifically comprises the following steps:
step one, design preparation:
adopting finite element analysis software to establish a structural integral calculation model, carrying out simulation analysis at each construction stage, giving the configuration and stress of the structure at each construction stage, and planning the construction stage;
secondly, determining the laying position of the circumferential cable (21), and setting up an installation operation platform of a cable clamp (23);
thirdly, setting up an installation operation platform of the radial cable (22);
fourthly, paving the annular cables (21);
fifthly, paving the radial cables (22); one end of a radial cable (22) is connected with a cable clamp (23), and the other end of the radial cable is connected with a lifting tool;
step six, arranging a supporting jig frame of the grid roof (1);
seventhly, installing a grid roof (1);
step eight, installing a temporary cable-stayed structure while installing the grid roof (1);
step nine, dismantling the supporting jig frame of the outer ring in sections;
step ten, hoisting the cable system structure (2) integrally;
installing a lifting tool, integrally lifting the annular cable (21), the radial cable (22) and the cable clamp (23) which are assembled on the ground to a proper position, and installing and fixing;
step eleven, stretching the radial cables (22) integrally in a grading manner, and automatically separating the grid roof (1) from the supporting jig frame of the outer ring;
step twelve, installing a V-shaped stay bar (3);
the diagonal brace is lifted to the right position, and two ends of the diagonal brace are respectively fixedly connected with a cable clamp (23) on the circumferential cable (21) and a cantilever end of the grid roof (1);
and step thirteen, dismantling the temporary cable-stayed structure, unloading the support jig frame and completing construction of the cable-supported grid structure.
2. The construction method of the overlength cantilever cable bearing grid structure according to claim 1, characterized in that: the cable bearing grid structure comprises an upper-chord single-layer grid roof (1) and a lower-chord cable system structure (2), wherein the middle part of the vertical stay bar (24) and the V-shaped stay bar (3) of the grid roof (1) and the cable system structure (2) are connected, the grid roof (1) is a single-layer planar grid structure and comprises an outer ring beam (11), an inner ring beam (12) and a radial beam (13), one end of the radial beam (13) is hinged with the outer ring beam (11), the other end of the radial beam extends towards the inside of the ring and is fixedly connected with the inner ring beam (12) to form an annular cantilever, and reinforcing ring beams (14) are arranged on the radial beam (13) at intervals and are arranged with the radial beam (13) to form a grid structure; the cable system structure (2) comprises a circumferential cable (21) and a radial cable (22), one end of the radial cable (22) is hinged with the outer ring beam (11), and the other end of the radial cable is hinged with a cable clamp (23) on the circumferential cable (21); the top end of the vertical stay bar (24) is connected with the grid roof (1), and the bottom end is fixedly connected with the radial cable (22); the V-shaped supporting rods (3) are V-shaped supporting structures formed by symmetrically arranging two inclined supporting rods and are arranged in parallel along the circumferential direction of the building, the bottom ends of the V-shaped supporting rods (3) are fixedly connected with cable clamps (23) on circumferential cables (21), and the top ends of the V-shaped supporting rods extend towards the inner side of the building in an inclined mode and are fixedly connected with the grid roof (1).
3. The construction method of the overlength cantilever cable bearing grid structure according to claim 2, characterized in that: the fourth step specifically comprises the following steps:
4.1, laying the lower layer inhaul cable of the annular cable (21) on the stand;
4.2, installing a cable clamp (23), and connecting and fixing the lower layer inhaul cable with the cable clamp (23);
4.3, connecting adjacent cable sections into a whole inhaul cable through a connector;
4.4, laying the upper layer cables of the annular cables (21) on the stand, and connecting and fixing the upper layer cables with the cable clamps (23) according to the steps to finish the assembly of the annular cables (21) and the fixation of the cable clamps (23).
4. The construction method of the overlength cantilever cable bearing grid structure according to claim 2, characterized in that: splicing the radial beams (13) on the ground, integrally hoisting single beams, and installing the vertical support rods (24) on the radial beams (13) on the ground and hoisting the vertical support rods together with the radial beams (13) in place; temporary supporting jig frames are arranged at the end parts of the radial beams (13) and the middle parts of the secondary structures, the secondary structures between adjacent radial main beams are hoisted according to the sequence from outside to inside, the secondary structures are supported on the temporary supporting jig frames, the end parts of the radial beams (13) are fixed with the outer ring beam (11) in a pin joint mode, the adjacent secondary structures are connected in sequence, and a reinforcing ring beam (14) and an inner ring beam (12) are formed.
5. The construction method of the overlength cantilever cable bearing grid structure according to claim 2, characterized in that: step eight, after 5 trusses are assembled on the grid roof (1), starting to install and stretch the temporary diagonal draw structures, wherein the temporary diagonal draw structures are arranged above the grid roof (1) and are in one-to-one correspondence with the V-shaped support rods (3); the specific setting process comprises the following steps:
8.1, when the grid roof (1) is spliced on the ground, fixing the supporting upright stanchion (41) above the grid roof (1) and taking place along with the hoisting of the grid roof (1);
8.2, installing a front end diagonal draw bar (42);
8.3, installing a rear end stay cable (43).
6. The construction method of the overlength cantilever cable bearing grid structure according to claim 5, characterized in that: the temporary cable-stayed structure comprises a supporting vertical rod (41), a cable-stayed rod (42) positioned on one side of the cantilever and a cable-stayed cable (43) positioned on one side far away from the cantilever; the bottom end of each supporting vertical rod (41) is fixedly connected with the upper surface of the grid roof (1), the central axis of each supporting vertical rod (41) and the circumferential cables (21) are positioned in the same vertical plane, the inclined pull rods (42) are arranged in pairs and symmetrically arranged in a V shape, the top end of each inclined pull rod is fixedly connected with the top of each supporting vertical rod (41), the bottom end of each inclined pull rod is fixedly connected with the cantilever end of the grid roof (1), and the designed installation positions of the two inclined pull rods (42) and the V-shaped supporting rods (3) are opposite up and down; the top end of the stay cable (43) is hinged with the top of the supporting upright rod (41), and the bottom end of the stay cable is connected with a tensioning tool fixed on the outer ring beam (11).
7. The construction method of the overlength cantilever cable bearing grid structure according to claim 1, characterized in that: and step nine, after the grid structure is assembled, sequentially disassembling the supporting jig frames of the outer ring clockwise or anticlockwise.
8. The construction method of the overlength cantilever cable bearing grid structure according to claim 1, characterized in that: the construction process of the step ten comprises the following steps:
10.1, installing a lifting tool;
10.2, synchronously lifting the whole cable system structure (2) to a corresponding elevation position;
10.3, connecting the annular cable (21) and the radial cable (22) with a vertical stay bar (24) through cable clamps (23) respectively;
and 10.4, installing a tensioning tool.
9. The construction method of the overlength cantilever cable bearing grid structure according to claim 8, characterized in that: a cable head (51) of the radial cable (22) is in pin joint with a connecting lug plate (61) on the outer ring beam (11), a tensioning tool is arranged on an adjusting screw rod (52) of the cable head (51), and tensioning lug plates (62) are symmetrically arranged on the outer ring beam (11) at two sides of the connecting lug plate (61); the tensioning tool comprises a bearing support (7), a jack and a steel bar (8), wherein a through hole is formed in the middle of the bearing support (7), an adjusting screw rod (52) penetrates through the through hole, the steel bar (8) is symmetrically arranged on the bearing supports (7) on two sides of the adjusting screw rod (52), one end of the steel bar penetrates through the bearing support (7) and is rotatably connected with tensioning lug plates (62) on two sides of an outer ring beam (11), and the jack penetrates through the other end of the steel bar.
10. The construction method of the overlength cantilever cable bearing grid structure according to claim 1, characterized in that: the specific tensioning process in the eleventh step comprises the following steps:
11.1, simultaneously tensioning the radial cables (22) integrally to 30% of a design value;
11.2, simultaneously tensioning the radial cables (22) integrally to 50% of a design value, and then opening a welding seam between the cable bearing grid structure and the supporting jig frame;
11.3, simultaneously tensioning the radial cables (22) integrally to 70% of a design value;
11.4, simultaneously and integrally tensioning the radial cables (22) to 100% of a design value, and then removing all tensioning tools.
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| CN114541591A (en) * | 2022-04-06 | 2022-05-27 | 中建八局第四建设有限公司 | Cable-supported grid structure closed cable external field reverse construction installation method |
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| CN114541776B (en) * | 2022-04-28 | 2022-07-12 | 北京市建筑工程研究院有限责任公司 | Stay cable lifting and tensioning conversion device and construction method thereof |
| CN114541776A (en) * | 2022-04-28 | 2022-05-27 | 北京市建筑工程研究院有限责任公司 | Stay cable lifting and tensioning conversion device and construction method thereof |
| CN115030386A (en) * | 2022-05-19 | 2022-09-09 | 中建钢构工程有限公司 | Construction method of endless cable chord support latticed shell structure |
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