CN114250705A - Truss bridge structure construction method based on secondary vertical rotation method - Google Patents
Truss bridge structure construction method based on secondary vertical rotation method Download PDFInfo
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- CN114250705A CN114250705A CN202111413268.4A CN202111413268A CN114250705A CN 114250705 A CN114250705 A CN 114250705A CN 202111413268 A CN202111413268 A CN 202111413268A CN 114250705 A CN114250705 A CN 114250705A
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- 238000010276 construction Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004804 winding Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000000725 suspension Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/08—Methods or apparatus specially adapted for erecting or assembling bridges by rotational movement of the bridge or bridge sections
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Abstract
The invention discloses a construction method of a truss bridge structure based on a secondary vertical rotation method, which is used for construction of truss bridges. The method comprises the following steps: lattice type diagonal rods (divided into an inner side and an outer side) are erected on the bearing platform, and the diagonal rods are provided with rotating hinges; after the inclined rods are limited by the stay cable and the support rod, the inclined rods on the inner side and the outer side are utilized to provide counter force mutually for carrying out first vertical rotation, the inclined rods are unfolded into a V-shaped structure and then locked, and a construction transportation channel is arranged on the inclined rods; performing suspension splicing construction to close the gantry, thereby forming a stable gantry structure; after the quadrilateral truss is constructed by using the platform, performing second vertical rotation, taking the structure as a counterforce support to retract a cable to vertically rotate the inclined rod, releasing the cable through an anchor cable, and vertically rotating to a design angle, thereby forming a complete lattice type inclined rod; and constructing the rest parts by using the traditional method. The invention has the following advantages: firstly, a temporary tower does not need to be built; secondly, a cable hoisting system does not need to be erected; thirdly, the method is safe and reliable; fourthly, the construction period is shortened, and the construction cost is reduced.
Description
Technical Field
The invention belongs to the technical field of bridge structure construction, and particularly relates to a construction method of a truss bridge structure.
Background
With the development of bridge engineering, the requirements for bridge structures are continuously increased, more and more abundant bridge structures are applied to practical engineering, and a steel truss bridge is taken as one of common bridge structures and has the advantages of strong spanning capability, high construction speed, strong bearing capability, good durability and the like. Along with the improvement of the quality of domestic steel products and the improvement of steel structure anticorrosion technology, steel structure bridges are applied to the field of highway engineering more and more.
In the engineering technology field, in order to achieve the purposes of saving cost, saving working hours, reducing environmental impact and the like, more and more new technologies are applied to bridge construction, and the bridge construction means commonly used at present are as follows: the construction method comprises the following steps of temporary pier frame, cantilever assembly, jacking method, floating crane assembly and the like, and the construction methods of the bridges have the following obvious defects: a large number of temporary structures need to be built in advance, complex dismantling work is needed in the later period, most of the construction cost is consumed on non-bridge structure parts, the construction period is long, and meanwhile, a large amount of material waste is generated; secondly, temporary structures such as temporary buttresses, temporary cantilever towers and the like occupy more construction sites and can also have adverse effects on the ecological environment; moreover, the conventional support method construction or floating crane method and the like are difficult to be applied to complex terrains such as deep valleys, and the construction capability is greatly limited.
Therefore, there is a need to develop a bridge construction method with small engineering quantity and resource saving, especially relating to the construction of truss bridges, and a new economic, efficient and environment-friendly construction method is urgently needed to meet the actual engineering needs.
Disclosure of Invention
The invention aims to provide a construction method of a truss bridge structure based on a secondary vertical rotation method aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the construction method of the truss bridge structure based on the secondary vertical rotation method comprises the following steps:
the method comprises the following steps that firstly, two main inclined rods are erected on a bearing platform and respectively comprise an inner inclined rod and an outer inclined rod; temporary rotating hinges are arranged between the two main inclined rods and the bearing platform and are matched and fixed through arranging inhaul cables and rigid supporting rods;
adjusting the lengths of the stay cable and the rigid support rod, and vertically rotating the outer side inclined rod outwards and the inner side inclined rod towards the forward bridge direction to a designed angle to complete the first vertical rotation; then, a construction transportation channel is arranged on the inner side inclined rod;
step three, arranging a ground anchor inhaul cable outside the outer inclined rod, and fixing the ground anchor inhaul cable; constructing a main beam chord member on the inner side diagonal member along the extension direction of the bridge by using a sling, and simultaneously constructing two ends of the bridge in opposite directions to the middle part of the bridge to close the bridge so as to form a stable portal structure;
fourthly, constructing a quadrilateral truss on the formed portal structure;
fifthly, taking the constructed structure as a counter-force support, detaching the rigid support rod at the outer side diagonal rod, then adjusting the length of the ground anchor inhaul cable, vertically rotating the outer side diagonal rod for the second time, combining the outer side diagonal rod with the inner side diagonal rod, and connecting and reinforcing the outer side diagonal rod and the inner side diagonal rod through a batten plate to form a complete diagonal rod structure;
and step six, constructing other bridge facilities such as a triangular truss, an abutment and the like, and finally forming the bridge.
The invention mainly comprises that lattice type diagonal rods (divided into an inner side and an outer side) are erected on a bearing platform, and the diagonal rods are provided with rotating hinges; after the inclined rods are limited by the stay cable and the support rod, the inclined rods on the inner side and the outer side are utilized to provide counter force mutually to perform first vertical rotation, the inclined rods are unfolded into a V-shaped structure and then locked, and a construction transportation channel is arranged on the inclined rods so as to facilitate transportation of structural sections; the construction method comprises the following steps of performing suspension splicing construction to closure according to the construction principle of a cable-stayed bridge, thereby forming a stable portal structure; the platform is used for constructing a quadrilateral truss and is used as a counter-force support to perform second vertical rotation, so that the integration of the inclined rods on the inner side and the outer side is realized, and a complete lattice type inclined rod is formed; and then the rest part is finished to form the bridge by using the traditional method.
The invention further explains that, in the step one, the inner diagonal rod and the outer diagonal rod are arranged at intervals along the bridge direction, and a plurality of inhaul cables are arranged between the inner diagonal rod and the outer diagonal rod; the length of the stay cable is adjusted through the stay cable winding device.
In the invention, each inclined rod is matched and fixed with the support rod by using the inhaul cable. The inner and outer side inclined rods are connected through a plurality of inhaul cables to limit the bending deformation of the inner and outer side inclined rods, and the inner and outer side inclined rods can be provided with a plurality of inhaul cables to be fixed with the ground anchor or provided with a balance weight; the inclined rod is provided with a plurality of rigid supporting rods for limiting and fixing. The positions of the two main inclined rods where the guys are arranged are correspondingly provided with a plurality of guy cable winding devices so as to realize vertical rotation of the traction inclined rods.
The invention further discloses that the rigid support rod adopts a hydraulic telescopic rigid support rod, one end of the rigid support rod is hinged with the inner side inclined rod or the outer side inclined rod, and the other end of the rigid support rod is hinged with the bearing platform.
The invention further explains that in the second step, the design angle of the inner inclined rod vertically rotating to the design angle along the bridge direction is the inclination angle of the inner inclined rod after the bridge is finally formed; after the first vertical rotation is completed, a temporary rotating hinge for connecting the inner side inclined rod and the bearing platform is fixed to form a fixed support.
The invention further explains that in the second step, after the guy cable and the support rod are fixed, the inner side inclined rod is provided with a construction channel and a main beam construction working platform.
The invention further explains that in the third step, the girder chord members are constructed along the extending direction of the bridge from the construction platform on the inner side diagonal member, the two ends of the bridge are simultaneously oppositely constructed until the middle part of the bridge is closed, and a stable portal structure is preliminarily formed.
The invention further explains that the fourth step is specifically: after the construction of the main beam chord member is finished, the support states of the ground anchor guy cable, the guy cable and the rigid support rod are kept, the formed portal frame is used as an operation platform, the construction of the quadrilateral truss and the upper chord member is carried out, and the truss structure is formed.
The invention further provides that the fifth step specifically comprises:
adjusting the lengths of the ground anchor inhaul cable, the inhaul cable and the rigid support rod for fixing the two inclined rods, and vertically rotating the outer inclined rod to be vertical to the bridge direction by taking the quadrilateral truss as a counter-force support;
after the anchor cable is vertically pulled, the anchor cable is vertically pulled to enable the outer inclined rod to be vertically rotated to be parallel to the inner inclined rod;
keeping the stable state of fixing all ground anchor inhaul cables, the inhaul cables and the rigid support rods, and combining and connecting the two main inclined rods through the batten plates to form an integral main inclined rod;
fixing a temporary rotating hinge for connecting the outer side inclined rod with the bearing platform to form a fixed support;
and (4) dismantling the ground anchor inhaul cable, the inhaul cable and the rigid supporting rod between the two main inclined rods.
According to the secondary vertical rotation method, the main diagonal rod of the truss type bridge is divided into two parts, the stay cable and the rigid support rod are fixed, the inner side diagonal rod and the outer side diagonal rod vertically rotate towards two sides to form stress balance, the construction of the chord rod and the truss part can be carried out, and finally the main diagonal rod is combined through secondary vertical rotation to form a stable portal structure.
Compared with the prior art, the invention has the following advantages:
1. the construction method effectively utilizes bridge structural members, reduces temporary structures, and saves materials and working hours; the construction of erecting a bracket in a river channel or a valley is not needed, so that the influence on a channel and the environment is reduced;
2. the invention has simple structure, reasonable design, convenient construction, strong applicability, safety and reliability; the construction of a temporary tower and the erection of a cable hoisting system are not needed, so that the construction cost is low; the construction period is shortened, the construction cost is low, and good economic benefits are achieved.
Drawings
FIG. 1 is a schematic view of the inner and outer diagonal members erected in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view of a first vertical turn in an embodiment of the present invention;
FIG. 3 is a schematic illustration of a main chord at a construction stage according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the construction of a quadrilateral truss according to an embodiment of the invention;
FIG. 5 is a schematic illustration of a second vertical turn in one embodiment of the present invention;
FIG. 6 is a schematic view of a truss bridge formation according to an embodiment of the present invention.
In the drawings, 1-inside diagonal; 2-outer diagonal rods; 3-anchor ground guy cable; 4-a pull cable; 5-rigid support rods; 6, temporary rotary hinging; 7-a bearing platform; 8-a main chord; 9-a sling; 10-batten plate; 11-a fixed support; 12-a quadrilateral truss; 13-triangular truss.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example (b):
the construction method of the truss bridge structure based on the secondary vertical rotation method comprises the following steps:
step one (as shown in fig. 1), two main inclined rods, namely an inner inclined rod 1 and an outer inclined rod 2, are erected on a bearing platform 7; a temporary rotating hinge 6 is arranged between the two main inclined rods and the bearing platform 7 and is matched and fixed by arranging a guy cable 4 and a rigid support rod 5;
step two (as shown in fig. 2), adjusting the lengths of the stay cable 4 and the rigid support rod 5, and vertically rotating the outer side inclined rod 2 outwards and the inner side inclined rod 1 towards the forward bridge direction to a designed angle to complete the first vertical rotation; then a utility transportation channel is arranged on the inner side diagonal rod 1;
step three (as shown in fig. 3), arranging a ground anchor inhaul cable 3 on the outer side of the outer inclined rod 2, and fixing the ground anchor inhaul cable 3; constructing a main beam chord member 8 on the inner side diagonal member 1 along the extension direction of the bridge by using a sling 9, and simultaneously constructing two ends of the bridge in opposite directions to the middle part to close up to form a stable portal structure;
step four (as shown in fig. 4), constructing a quadrangular truss 12 on the formed portal structure;
step five (as shown in fig. 5), taking the constructed structure as a counter-force support, detaching the rigid support rod 5 at the outer side diagonal rod 2, then adjusting the length of the ground anchor inhaul cable 3, vertically rotating the outer side diagonal rod 2 for the second time, combining the outer side diagonal rod with the inner side diagonal rod 1, and connecting and reinforcing the outer side diagonal rod with the batten plate 10 to form a complete diagonal rod structure;
and sixthly (as shown in fig. 6), constructing the triangular truss 13, the abutment and other bridge facilities, and finally forming the bridge.
Further explained in the above embodiment, in the first step, the inner diagonal rod 1 and the outer diagonal rod 2 are arranged at intervals along the bridge direction, and a plurality of guys 4 are arranged between the inner diagonal rod 1 and the outer diagonal rod 2; the length of the stay cable 4 is adjusted through a stay cable winding device.
In the above embodiment, the rigid support rod 5 is a hydraulic telescopic rigid support rod, one end of which is hinged to the inner diagonal rod 1 or the outer diagonal rod 2, and the other end of which is hinged to the bearing platform 7.
Further explained in the above embodiment, in the second step, the design angle of the inner diagonal rod 1 vertically rotating to the design angle along the bridge direction is the inclination angle of the inner diagonal rod 1 after the bridge is finally formed; after the first vertical rotation is completed, a temporary rotating hinge 6 for connecting the inner side inclined rod 1 and the bearing platform 7 is fixed to form a fixed support 11.
Further explained in the above embodiment, the fourth step is specifically: after the construction of the main beam chord member 8 is completed, the support states of the ground anchor guy cables 3, the guy cables 4 and the rigid support rods 5 are maintained, and the formed portal frame is used as an operation platform to perform the construction of the quadrangular truss 12 and the upper chord member part, so that the truss structure is formed.
Further explained in the above embodiments, the step five specifically includes:
adjusting the lengths of a ground anchor cable 3, a cable 4 and a rigid support rod 5 which are used for fixing the two inclined rods, and vertically rotating the outer inclined rod 2 to be vertical to the bridge direction by taking the quadrilateral truss as a counter-force support;
after the ground anchor inhaul cable 3 is vertically converted, the ground anchor inhaul cable 3 is used for releasing the cable to enable the outer inclined rod 2 to vertically rotate to be parallel to the inner inclined rod 1;
keeping the stable state of fixing all the ground anchor guys 3, guys 4 and rigid support rods 5, and combining and connecting the two main inclined rods through the batten plates 10 to form an integral main inclined rod;
fixing a temporary rotating hinge 6 for connecting the outer side inclined rod 2 with the bearing platform 7 to form a fixed support 11;
and (3) dismantling the ground anchor inhaul cable 3, the inhaul cable 4 and the rigid support rod 5 between the two main inclined rods.
It should be understood that the above-described embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the practice of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description; this is not necessary, nor exhaustive, of all embodiments; and obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (6)
1. The construction method of the truss bridge structure based on the secondary vertical rotation method is characterized by comprising the following steps of:
step one, two main inclined rods are erected on a bearing platform (7), namely an inner inclined rod (1) and an outer inclined rod (2); a temporary rotating hinge (6) is arranged between the two main inclined rods and the bearing platform (7) and is matched and fixed by arranging a guy cable (4) and a rigid support rod (5);
adjusting the lengths of the stay cable (4) and the rigid support rod (5), and vertically rotating the outer side inclined rod (2) outwards and the inner side inclined rod (1) towards the forward bridge direction to a designed angle to complete the first vertical rotation; then a facility industrial transportation channel is arranged on the inner side diagonal rod (1);
step three, arranging a ground anchor inhaul cable (3) on the outer side of the outer inclined rod (2), and fixing the ground anchor inhaul cable (3); constructing a main beam chord member (8) on the inner side diagonal member (1) along the extending direction of the bridge by using a sling (9), and simultaneously constructing two ends of the bridge in opposite directions to the middle part to close up to form a stable portal structure;
fourthly, constructing a quadrilateral truss (12) on the formed portal structure;
fifthly, taking the constructed structure as a counter-force support, detaching a rigid support rod (5) at the outer side inclined rod (2), then adjusting the length of a ground anchor inhaul cable (3), vertically rotating the outer side inclined rod (2) for the second time, combining the outer side inclined rod with the inner side inclined rod (1), and connecting and reinforcing through a batten plate (10) to form a complete inclined rod structure;
and sixthly, constructing other bridge facilities such as the triangular truss (13), the abutment and the like, and finally forming the bridge.
2. The construction method of the truss-like bridge structure based on the secondary vertical rotation method according to claim 1, wherein: in the first step, the inner inclined rod (1) and the outer inclined rod (2) are arranged at intervals along the bridge direction, and a plurality of inhaul cables (4) are arranged between the inner inclined rod (1) and the outer inclined rod (2); the length of the stay cable (4) is adjusted through a stay cable winding device.
3. The construction method of the truss-like bridge structure based on the secondary vertical rotation method according to claim 1, wherein: the rigid support rod (5) adopts a hydraulic telescopic rigid support rod, one end of the rigid support rod is hinged with the inner side inclined rod (1) or the outer side inclined rod (2), and the other end of the rigid support rod is hinged with the bearing platform (7).
4. The construction method of the truss-like bridge structure based on the secondary vertical rotation method according to claim 1, wherein: in the second step, the design angle of the inner side diagonal rod (1) vertically rotating to the design angle along the bridge direction is the inclination angle of the inner side diagonal rod (1) after the bridge is finally formed; after the first vertical rotation is finished, a temporary rotating hinge (6) for connecting the inner side inclined rod (1) with the bearing platform (7) is fixed to form a fixed support (11).
5. The construction method of the truss-like bridge structure based on the secondary vertical rotation method according to claim 1, wherein: the fourth step is specifically as follows: after the construction of the main beam chord member (8) is finished, the support states of the ground anchor guy cable (3), the guy cable (4) and the rigid support rod (5) are kept, and the formed portal frame is used as an operation platform to carry out the construction of a quadrilateral truss (12) and an upper chord member part to form a truss structure.
6. The construction method of the truss-like bridge structure based on the secondary vertical rotation method according to claim 1, wherein: the fifth step specifically comprises:
the lengths of a ground anchor inhaul cable (3), an inhaul cable (4) and a rigid support rod (5) for fixing the two inclined rods are adjusted, and the outer inclined rod (2) is vertically rotated to be vertical towards the direction of the forward bridge by taking the quadrilateral truss as a counter-force support;
after the anchor cable is vertically stressed, the anchor cable (3) is used for releasing the cable to enable the outer inclined rod (2) to vertically rotate to be parallel to the inner inclined rod (1);
the stable state of all the ground anchor inhaul cables (3), the inhaul cables (4) and the rigid support rods (5) is kept and fixed, and the two main inclined rods are combined and connected through the batten plates (10) to form an integral main inclined rod;
a temporary rotating hinge (6) for fixing the outer side inclined rod (2) and the bearing platform (7) to form a fixed support (11);
and (3) dismantling the ground anchor inhaul cable (4) and the rigid supporting rod (5) between the two main inclined rods.
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