CN114855654A - Stable inclined pier construction method without interrupting traffic operation - Google Patents
Stable inclined pier construction method without interrupting traffic operation Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E—FIXED CONSTRUCTIONS
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- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
Abstract
The invention provides a construction method of a stable inclined pier without interrupting traffic operation, which is characterized in that the inclined pier is limited by arranging a stable cable anchor ingot, a winch anchor ingot, a horizontal stable cable and a pier body stable cable, steel pipe lattice piers are constructed around the inclined pier, the upper load of the inclined pier is placed on the steel pipe lattice piers, then a bridge pier column is newly built, and finally the steel pipe lattice piers are removed, so that the whole construction process is completed. The inclined pier repairing method has small social influence, can quickly recover normal traffic under the condition of bridge repairing with guaranteed quality and quantity, avoids inconvenience caused by traffic interruption, reduces the social influence as much as possible, greatly improves the social benefit, obtains better economic benefit, is especially the first example of the whole country in a pier stabilizing mode in the construction process, and fills the gap of the bridge reinforcing technology.
Description
Technical Field
The invention relates to the technical field of bridge and road repair, in particular to a stable inclined pier construction method without interrupting traffic operation.
Background
With the rapid development of bridge construction in China, the bridge diseases frequently appear in the bridge construction and use processes, the treatment of the bridge diseases is more and more prominent day by day, for example, the displacement, fracture and damage of bridge pile foundations caused by uneven earth piling, water pressure, earthquake or other reasons can cause the lower part and the upper part of a bridge to be greatly inclined, so that the bridge has great potential safety hazards, the safe use of the bridge is seriously affected, and the bridge can be recovered to a normal safe use state after being subjected to necessary treatment.
Because the bearing capacity of the damaged pile foundation cannot be judged, the pier stud is still in slow displacement, the system is probably close to a critical balance state, bridge collapse and casualties can occur in the danger-removing construction process under the action of small external force, and the risk is very high, so that the traditional treatment methods such as blasting, top-down dismantling and the like are not applicable any more, and the bridge road main body can be greatly damaged by adopting the method for treatment, the vehicle cannot be communicated for operation within a long period of time for repair, the social influence and the influence on the economic benefit are great.
Disclosure of Invention
The invention aims to provide a stable inclined pier construction method without interrupting traffic operation, which can be suitable for treating bridge diseases caused by the replacement of original bridge pier columns and pile foundations under the condition that the bridge pile foundations are displaced, broken and damaged, so that the lower and upper structures of a bridge are greatly inclined and still slowly displaced, and the traffic operation of the bridge is not suspended.
The embodiment of the invention is realized by the following technical scheme:
a construction method of a stable inclined pier without interrupting traffic operation specifically comprises the following steps:
s1, respectively arranging a stabilizing cable anchor ingot at the four-side symmetrical position of the inclined pier, wherein the stabilizing cable anchor ingot consists of a pile foundation and a bearing platform type concrete anchor ingot;
s2, arranging a winch anchor ingot and a traction winch at the position adjacent to each stabilizing cable anchor ingot, and fixing and limiting the traction winch;
s3, arranging pulley blocks at the bottom of the inclined pier, connecting the inclined pier with four stable cable anchor ingots in different directions by using a steel wire rope stable cable bag bundle, arranging a dynamometer at the end of each pulley block, tensioning the steel wire rope stable cable tension to the calculated data by a traction winch, a chain block and a jack, and preliminarily stabilizing the bottom of the inclined pier;
s4, arranging a pulley block group along the pier body of the inclined pier, connecting the inclined pier and four stable cable anchor ingots in different directions by using a steel wire rope stable cable bag bundle, arranging a dynamometer at the end part of the pulley block group, and tensioning the steel wire rope stable cable tension to calculation data by a traction winch, a chain block and a jack so as to further stabilize the pier body of the inclined pier;
s5, arranging steel pipe lattice piers on two sides of the inclined pier;
s6, by means of jacking and supporting, bearing the structural load on the upper part of the inclined pier on the steel pipe lattice pier, and adjusting the tension value of the steel wire rope stabilizing cable according to the calculated value in the jacking process to maintain the inclined pier in a balanced state;
s7, arranging a hoisting crown block system on the bridge floor above the inclined pier, dismantling the inclined pier through a hoisting winch, a rope saw and a suspension cage, moving down the pier body stabilizing rope layer by layer in the dismantling process of the inclined pier, and maintaining the force system to be stable by adjusting the horizontal stabilizing ropes in four directions and the pier body stabilizing rope;
s8, constructing a new pile foundation and a new pier stud;
s9, transferring the load of the upper structure of the bridge on the newly-built pier column through jacking to complete the replacement of the stress system and perform jacking transverse reset on the upper structure;
and S10, removing the steel pipe lattice piers, and enabling the bridge to recover normal traffic operation.
And further arranging pier column displacement monitoring points around the inclined pier body, carrying out uninterrupted monitoring on the inclined pier, and determining whether to continue construction according to the deviation condition of the inclined pier.
And further, the pier body stabilizing cable and the horizontal stabilizing cable are monitored through the dynamometer, displacement monitoring points are arranged around the stabilizing cable anchor ingot and the winch anchor ingot, and whether construction is continued or not is determined according to monitoring data.
And further, arranging lattice pier displacement monitoring points around the steel pipe lattice piers, carrying out continuous monitoring on the steel pipe lattice piers, and determining whether to continue construction according to the deformation value of the steel pipe lattice piers.
Further, in the step S1, the distances between the anchor blocks of the stabilizing cables in the four directions and the inclined pier should not be less than the collapse and falling radius of the inclined pier and the superstructure to prevent the bridge from collapsing and damaging the constructors, and the space for the existing structures and the crane to be operated later should be considered.
Further, before the step S4 is performed, a high pressure jet grouting pile construction process is further used to reinforce the foundation around the pier.
Further, in the step S5, the steel pipe lattice pier is in a v-21274h-shaped structure as a whole, and one side of the cross sections of the bearing platforms at the two sides of the steel pipe lattice pier is in a rectangular structure and the other side is in a trapezoidal structure due to the requirements on the horizontal stabilizing cables, the pier body stabilizing cables and the upper load of the steel pipe lattice pier.
Further, in the step S6, when the inclination angle of the inclined pier is too large, in order to prevent the T-beam above the inclined pier from colliding with an adjacent road and being damaged during jacking, a flexible limiting device is provided to limit the T-beam.
Further, in the step S7, after the bridge deck above the inclined pier is broken, a hoisting crown block system is manufactured on the bridge deck by using steel pipes, steel rails, channel steel, steel wire ropes, pulleys and a hoisting winch, and in order to reduce damage to the whole bridge caused by hoisting operation, the steel rails should be overlapped with the steel pipe lattice piers below.
Further, in the step S8, in order to reduce the disturbance of the foundation, the pile foundation and the pier are newly built at positions avoiding the original pile foundation and the pile foundation without removing the pile foundation and the pile foundation below the original inclined pier, and the pile foundation, the pile foundation and the pier are newly built above the original pile foundation.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
1. the method for repairing the inclined pier has higher safety, can effectively maintain the balance of the original force system, does not cause sudden change of the original force system, thereby maintaining the stability of the inclined pier, realizing the orderly execution of the construction steps, and having more applicable scenes without using large-scale equipment such as a bridge girder erection machine and the like;
2. the inclined pier repairing method has small social influence, can quickly recover normal traffic under the condition of bridge repairing with guaranteed quality and quantity, avoids inconvenience caused by traffic interruption, reduces the social influence as much as possible, greatly improves the social benefit, obtains better economic benefit, is especially the first example of the whole country in a pier stabilizing mode in the construction process, and fills the gap of the bridge reinforcing technology.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a construction flow chart of the present invention;
fig. 2 is a schematic perspective view of the pier body stabilizing cable and the horizontal stabilizing cable according to the present invention;
fig. 3 is a schematic front view of a steel pipe lattice pier and an inclined pier according to the present invention.
Icon: 1. inclining the bridge pier; 2. a pier body stabilizing rope; 3. a horizontal stabilizing cable; 4. stabilizing cable anchor ingots; 5. windlass anchor blocks; 6. steel pipe lattice pier.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, 2 and 3, a stable inclined pier construction method without interrupting traffic operation is mainly used in the case of a slow inclined movement of a pier supporting a bridge body, and the conventional scheme generally uses a method of newly building after blasting or removing both the upper and lower parts of an inclined pier 1, and both methods have more or less disadvantages:
if a blasting new construction scheme is adopted, on the social level, the new construction period is long, the disconnection time is long, vehicles can not pass at all, the social influence is great, and on the safety, if blasting is unsuccessful, a bridge support system becomes more unfavorable or the chain inclination reaction of adjacent pier studs is caused, so that the safety risk is great;
if the method of removing the upper part and the lower part of the inclined pier 1 is adopted, on the social level, the newly-built project is long in period and long in disconnection time, vehicles can not pass through the bridge completely, the social influence is great, on the safety, the bridge support system can be close to the critical balance state, the bridge collapse and the personal casualties can be caused in the danger elimination construction process under the action of small external force, the risk is great,
therefore, both the two methods have great limitations, based on deep thinking and research on the problems, and through practice of rescue and danger elimination of recovery reconstruction engineering (hereinafter referred to as a Yibin new airport project) of Yibin new airport east connecting line red dam interchange B ramp 5# pier, the scheme is relatively safe, reliable, economical and applicable, and is worth applying and popularizing in treatment of the same type of bridge diseases, the construction method can be suitable for treating the bridge diseases of the original bridge pier and the original bridge pile foundation by replacing the original bridge pier under the condition that the bridge pile foundation is displaced, broken and damaged to further cause large-amplitude inclination of the lower part and the upper part of the bridge and is still in slow displacement, and the construction method specifically comprises the following steps:
as shown in fig. 1 and 2, after the position of the inclined pier 1 is determined, S1, a stable cable anchor 4 is respectively arranged in four directions around the inclined pier 1, the distance between the stable cable anchor 4 in the four directions and the inclined pier 1 should not be less than the collapse and fall radius of the inclined pier 1 and the superstructure, so as to prevent the bridge from collapsing and hurting the constructors, a horizontal stable cable 3 and a pier body stable cable 2 are arranged between the stable cable anchor 4 and the inclined pier 1, the positions of the four stable cable anchor 4 should be symmetrical to each other, so as to control the direction of the resultant force of the plane force, further guide the inclined direction of the inclined pier 1, prevent the inclined pier 1 from being twisted due to the stress of the horizontal stable cable 3 and the pier body stable cable 2, and consider the existing structures, the horizontal stable cable 3, the pier body stable cable 2 and the space for the later crane operation;
in the embodiment, the stabilizing cable anchor 4 is composed of a pile foundation and a bearing platform type concrete anchor, the anchor point self gravity and the friction force between the pile foundation and soil resist the pulling force of the horizontal stabilizing cable 3 and the pier body stabilizing cable 2, relevant parameters of the pile foundation of the anchor point and the bearing platform type concrete anchor are designed according to geological reports and the pulling force which can be received by the anchor point before construction, in a Yibin new airport project, the stabilizing cable anchor 4 adopts eight C30 pile foundations with the diameter of phi 150, the bearing platform is 6.8m 14m 3m, the bearing platform concrete is C40 in the mark, and the piles among the eight C30 pile foundations are connected by the tool 22 to enhance the integrity of the anchor point.
In this embodiment, set up pier stud displacement monitoring point around slope pier 1, carry out incessant control to slope pier 1, whether continue the construction according to the skew condition of slope pier 1.
S2, arranging a winch anchor 5 and a traction winch at the position close to each stable cable anchor 4, fixing and limiting the traction winch, arranging the winch anchor 5 in a safety region close to the stable cable anchor 4 according to the field condition, using 4 phi 500 concrete steel pipe piles as pile foundations for the winch anchor 5, and arranging two tools 45 at the outer back for connection;
s3, arranging a horizontal stabilizing rope 3 between the pier bottom of an inclined pier 1 and a stabilizing rope anchor 4 and a winch anchor 5, wherein the horizontal stabilizing rope 3 consists of a jack, a tackle pulley group, a steel wire rope, a shackle, a dynamometer, a traction winch and a chain block, the tackle pulley group is arranged at the pier bottom of the inclined pier 1, the inclined pier 1 and the four stabilizing rope anchors 4 in different directions are connected by a steel wire rope stabilizing rope bag bundle, the dynamometer is arranged at the end part of each tackle pulley group, the steel wire rope stabilizing rope tension force is tensioned to calculation data through the traction winch, the chain block and the jack, and the pier bottom of the inclined pier 1 is initially stabilized;
in this embodiment, the material specification parameters related to the horizontal stabilizer cable 3 should be determined by calculation according to the magnitude of the required tension, and in the yibin new airport project, the required material specifications include: the jack is a 3 phi 36.5mm steel wire rope, a hemp core with the specification of 6 multiplied by 37 plus FC, an 80T pulley, a phi 24mm steel wire rope, an 85T shackle, a 10T chain block and a 5T traction winch.
When arranging the horizontal stabilizing cable 3, firstly, a tackle pulley should be arranged: eight 80t three-door pulleys are divided into two groups of tackle blocks in the direction of each stabilizing cable anchor ingot 4, each group of four pulleys is provided, a single steel wire rope with the diameter of 24mm penetrates through each group of tackle blocks to form a 12-wire rope, and the dead end of the steel wire rope is connected with a dynamometer and is accessed into a monitoring room;
secondly, arranging a jack: each group of jacks consists of 3 phi 36.5 steel wire ropes, bundles the inclined pier 1 and pile foundations of the stabilizing cable anchor ingots 4, each group is fixed with an 85T shackle, the shackle is connected with an 80T tackle block, eight groups of jacks are arranged in the direction of the four stabilizing cable anchor ingots 4, and four groups of pier columns and four groups of anchor points are arranged;
and finally, tensioning a horizontal stabilizing rope 3: the tension value of the horizontal stabilizing cable 3 is determined by calculation according to the balance condition of the inclined pier 1, in a new airport project, the resultant force of the horizontal stabilizing cable 3 at each stabilizing cable anchor 4 is 120T-240T, in order to ensure the stability of the force system during tensioning, a 10T chain block or a 5T traction winch is adopted as a driving force to synchronously and symmetrically stretch in a grading manner, the horizontal stabilizing cable 3 is firstly small and then large, every 1T is a grade, every 5T is a grade after the force exceeds 15T, the horizontal stabilizing cable 3 is gradually stretched to a calculated value, the force value of the horizontal stabilizing cable 3 opposite to the pier bottom displacement direction of the inclined pier 1 is mainly controlled in four horizontal stabilizing cables 3, the rest horizontal stabilizing cables 3 are mainly controlled in displacement, and are properly tightened, and the resultant force direction is kept to point at the stabilizing cable anchor 4 opposite to the displacement direction of the inclined pier 1.
After the horizontal stabilizing cables 3 are arranged, the foundation around the inclined pier 1 can be reinforced by adopting a high-pressure jet grouting pile construction process, but in the actual implementation process, the method has different effects according to different geological conditions, so that the method is selectively used according to the actual implementation conditions.
As shown in fig. 1 and 2, S4, arranging a pier body stabilizing rope 2 between a pier body of an inclined pier 1 and a stabilizing rope anchor 4 and a winch anchor 5, wherein the pier body stabilizing rope 2 is composed of a jack, a limiting steel bar, a pulley block, a steel wire rope, a shackle, a dynamometer, a traction winch and a chain block, the pulley block is arranged along the pier body of the inclined pier 1, the inclined pier 1 and the four stabilizing rope anchors 4 in different directions are connected by a steel wire rope stabilizing rope pocket bundle, the end of the pulley block is provided with the dynamometer, and the steel wire rope stabilizing rope tension is tensioned to calculated data by the traction winch, the chain block and the jack to stabilize the pier body of the inclined pier 1;
in this embodiment, the specification parameters of the relevant material of the pier body stabilizing rope 2 should be determined by calculation according to the magnitude of the required tension, and in the yippen new airport project, the required material specifications include: the jack is a 3 phi 36.5mm steel wire rope, a hemp core with the specification of 6 multiplied by 37 plus FC, a phi 100 steel bar, an 80T pulley, a phi 24mm steel wire rope, an 85T shackle, a 10T chain block and a 5T traction winch.
When arranging the pier body stabilizing rope 2, firstly, a pulley block is arranged: eight 80t three-door pulleys are divided into two groups of tackle blocks in the direction of each stabilizing cable anchor ingot 4, each group of four pulleys is provided, a single steel wire rope with the diameter of 24mm penetrates through each group of tackle blocks to form a 12-wire rope, and the dead end of the steel wire rope is connected with a dynamometer and is accessed into a monitoring room;
secondly, arranging a jack: taking a suspension cage, inserting a phi 100 steel bar with the length of 1m into a phi 110 hole which is 60cm away from the pier body of an inclined pier 1 by using a hydraulic drill, tightly filling a gap, preventing the displacement of a jack, installing jacks by manually matching with a crane, wherein each set of jack consists of a 3 phi 36.5 steel wire rope, and is connected with the inclined pier 1 and a stabilizing cable anchor ingot 4 in a bundling manner, one 85T shackle is fixed in each set, the shackle is connected with an 80T pulley block, eight sets of jacks are arranged in the direction of each stabilizing cable anchor ingot 4, four sets of the jacks are arranged along the pier body of the inclined pier 1, and four sets of the stabilizing cable anchor ingots 4 are arranged;
then, connecting the pulley block group with the jack head by the sequence of the inclining direction of the pier 1 from top to bottom and the inclining direction of the pier 1 from the reverse direction of the inclining direction of the pier 1;
and finally tensioning a pier body stabilizing rope 2: the tension value of the pier body stabilizing rope 2 is determined by calculation according to the balance condition of the inclined pier 1, in a Yibin new airport project, the resultant force of the pier body stabilizing rope 2 at each stabilizing rope anchor ingot 4 is 120T-240T, the tension force is gradually reduced from top to bottom, in order to ensure the stability of the force system during tensioning, a 10T chain hoist or a 5T traction winch is adopted as a driving force to synchronously and symmetrically stretch in a grading manner, the pier body stabilizing rope 2 is mainly controlled by the force value of the pier body stabilizing rope 2 opposite to the inclination direction of the inclined pier 1, the pier body stabilizing rope 2 is mainly controlled by displacement, the rest pier body stabilizing ropes 2 are properly tightened, and the resultant force direction is kept to point to the stabilizing rope anchor ingot 4 opposite to the displacement direction of the inclined pier 1.
During the construction of the pier stabilizing wires 2 and the horizontal stabilizing wires 3, attention should be paid to:
firstly, a series of security measures such as safety education, emergency drilling, communication conditions and the like are made before construction, and the smoothness of an emergency escape route and a hospitalizing route is ensured;
monitoring the pier body stabilizing rope 2 and the horizontal stabilizing rope 3 mainly by displacement monitoring and assisted by rope force monitoring, prohibiting the pier stud from generating large displacement in the horizontal rope tensioning process, controlling the accumulated displacement within +/-5 mm, if the monitoring data has public grade change in the construction process, monitoring personnel should immediately call through an interphone and simultaneously sound an alarm, starting an emergency plan, and dragging a winch operator to brake the traction winch emergently and evacuate all on-site personnel in the direction specified by drilling;
after the horizontal stabilizing rope 3 is stressed, the horizontal stabilizing rope 3 is prevented from being damaged by mechanical equipment rolling and welding firing operation, and the horizontal stabilizing rope 3 is connected with the pier ground of the inclined pier 1 and the pile foundation of the stabilizing rope anchor ingot 4, so that the horizontal stabilizing rope 3 is tightly attached to the ground, the horizontal stabilizing rope 3 is protected, and a steel bridge is additionally arranged to enable the equipment to cross over the rope.
In the construction process, a pier body stabilizing cable 2 and a horizontal stabilizing cable 3 are monitored through a dynamometer, displacement monitoring points are arranged around a stabilizing cable anchor 4 and a winch anchor 5, and whether the construction is continued or not is determined according to monitoring data.
As shown in fig. 1 and 3, S5, arranging steel pipe lattice piers 6 at two sides of the inclined pier, wherein the steel pipe lattice piers 6 are composed of steel pipe piles, bearing platforms, steel pipe columns and cross beams, relevant size parameters are calculated and determined according to the load of the upper structure of the bridge, and the concrete construction steps include;
firstly, in a Yibin new airport project, bearing platforms are uniformly arranged along the two sides of a 5# pier transverse bridge, in order to reduce construction disturbance and save construction time, a bearing platform pile foundation is composed of 6 steel pipe piles, the distance between the steel pipe piles in the transverse bridge direction is 4.5m, the distance between the steel pipe piles in the bridge direction is 3.5m, the specification of the steel pipe piles is phi 1220 x 11mm, a 120-type vibration hammer is adopted during construction to drive the steel pipe piles into a foundation rock surface, the penetration degree of the steel pipe piles is less than 5mm/min to determine that the steel pipe piles are driven in place, 22b I-beams are transversely connected to form a whole on the top surface, the tops of the steel pipe piles extend into the bearing platforms by 130cm, 3 steel pipes in the right side extend into 130cm, the rest 3 steel pipes are 130cm, and when the span diameter of the steel pipe piles is more than or equal to 6m, 3 steel pipes with the top ends of adjacent steel pipe piles are additionally provided with 9m and 45b I-beams to improve the anti-cutting capability of the bearing platforms;
secondly, due to the requirements on the horizontal stabilizing cables 3, pier body stabilizing cables 5 and the beam load on the upper part of the steel pipe lattice pier 6, one side of the cross sections of the bearing platforms on the two sides of the steel pipe lattice pier 6 is of a rectangular structure, the other side of the cross sections of the bearing platforms is of a trapezoidal structure, in order to avoid disturbance of earth excavation mechanical operation, the elevation of the bottom of the bearing platform is consistent with the elevation of the existing bottom surface, because the horizontal stabilizing cables 3 are connected with the pier ground of the inclined pier 1 and the pile foundation of the stabilizing cable anchor ingot 4, the horizontal stabilizing cables 3 are tightly attached to the ground, the horizontal stabilizing cables 3 are protected, and when the position of the horizontal stabilizing cables 3 is intersected with the bearing platforms, the horizontal stabilizing cables 3 pass through the bearing platforms through phi 50PE pipes;
thirdly, reinforcing steel bars at the top and bottom layers of the bearing platform are all double-layer phi 20 reinforcing mesh, the distance between the reinforcing steel bars (meshes) is 15cm, and one reinforcing steel bar is arranged at the interval of 30cm, so that at least 3 reinforcing steel bars at the bottom layer of the reinforced steel pipe pile and the bearing platform are connected to penetrate through the steel pipe pile, and other reinforcing steel bars are adjusted to avoid, and a pre-embedded component and a horizontal stabilizing cable are avoided when concrete is poured and vibrated;
fourthly, embedding a steel plate with the thickness of 3cm in the steel pipe pile foundation, embedding bolts, enabling the holes to be consistent with the steel pipe columns, and enabling newly welded L-shaped 25 steel bars to penetrate through the steel plate to increase the stability of connection between the steel plate and the bearing platform;
fifthly, as shown in fig. 3, after the construction of the bearing platform, 6 steel pipes with the diameter of 800 mm multiplied by 16mm are arranged on the top surfaces of the bearing platforms on two sides, the center distance between the bearing platforms on two sides is 22.5m, the clear distance is 17.2m, in the project of Yibin new airport, the height of the steel pipe lattice pier is 39.785m, a single steel pipe lattice pier 6 is formed by 3 standard sections and 1 column foot section, each standard steel lattice member is 12m high, two layers of cross beams are specially arranged between the upper ends of the steel pipes on two sides, transverse inclined struts are arranged between the cross beams, 4H 650 300H 20H steel cross beams are arranged above the inclined struts, the steel pipe lattice pier 6H steel cross beams are made of Q345 steel, and the rest members are made of Q235 steel.
In the Yibin new airport project, the steel pipe lattice pier 6 is of a structure of a shape of a letter 21274, lattice pier displacement monitoring points are arranged around the steel pipe lattice pier 6 to continuously monitor the steel pipe lattice pier 6, and whether construction is continued or not is determined according to the deformation value of the steel pipe lattice pier 6.
S6, after the steel pipe lattice pier 6 is installed and is accepted according to a scheme design file and relevant technical specifications, the original structural support system can be converted, the structural load on the upper part of the inclined pier is completely transferred to the steel pipe lattice pier in a jacking and supporting pad mode, and the tension value of a steel wire rope stabilizing cable is adjusted according to the calculated value in the jacking process to enable the inclined pier to maintain a balanced state;
in the new airport project of yibin, 1 upper portion T roof beam of slope pier slope range is great, it causes the dog to break to sticis the laminating with road right side dog to have compressed, for preventing that the T roof beam breaks away from behind the bent cap and emptys the landing to the road right side along current trend of motion, if adopt rigidity spacing, then can produce destruction to the T roof beam at T roof beam jacking in-process, so specially set up flexible stop device and carry out spacingly to the T roof beam, flexible stop device mainly comprises 2 long 2m worker 45, phi 36.5 cable wires, the device pulls the drawing to the T roof beam, avoid rigid contact to lead to its damage.
In the Yibin airport project, because the longitudinal reset heights of the left and right breadth of the bridge deck of the project are not consistent, the reset track is an arc line, and in order to ensure the contact surface of the jack and the bottom of the beam, a hinged slope regulator is specially arranged to ensure the contact surface of the jack and the T beam, so that the safety is improved.
During jacking, a PLC (programmable logic controller) controlled hydraulic synchronous system is arranged to slowly rotate and bear the superstructure originally supported on the inclined pier 1 on the steel pipe lattice pier 6 through staged jacking, so that the inclined pier 1 does not bear the load of the superstructure any more, namely, the conversion of a superstructure supporting system is completed, as the vertical pressure of the inclined pier 1 is reduced during jacking, in order to avoid the instability of the inclined pier 1, the jacking force is slowly increased, and the cable force of the horizontal stabilizing cables 3 and the pier body stabilizing cables 2 is adjusted according to the jacking force and the displacement change condition of the inclined pier 1, the vertical component force of the horizontal stabilizing cables 3 and the pier body stabilizing cables 2 is increased to reduce the adverse effect caused by the loss of the superstructure pressure of the inclined pier 1, and the inclined pier 1 is maintained in a balanced state.
S7, after the bridge deck above the inclined pier 1 is broken, a hoisting crown block system is manufactured on the bridge deck by adopting a steel pipe, a steel rail, channel steel, a steel wire rope, a pulley and a hoisting winch, in order to reduce the damage of hoisting operation on the whole bridge, the position of the steel rail is overlapped with a steel pipe lattice pier 6 below, the inclined pier 1 is dismantled by the hoisting winch, a rope saw and a suspension cage, and is hoisted to the ground by using a crown block and is cleared, in the process of dismantling the inclined pier 1, the pier body stabilizing cables move downwards layer by layer, and the force system is maintained to be stable by adjusting the horizontal stabilizing cables 3 and the pier body stabilizing cables 2 in four directions;
s8, in order to reduce foundation disturbance, without dismantling a bearing platform and a pile foundation at the original inclined pier 1, selecting to avoid the original pile position to newly build the pile foundation, the bearing platform and the pier, and newly building the bearing platform above the original bearing platform, wherein the original bearing platform section adopts a water-milled brick for reaming, and a rotary excavation pile is adopted below the original bearing platform for construction, so as to complete a newly-built structure;
s9, when the strength of the capping beam and the stone pad concrete of the newly-built pier reaches the design strength, restoring a structural support system, namely, converting and supporting the structure temporarily supported on the steel tube lattice pier 6 on the newly-built pier and the capping beam in a jacking and oil return beam falling mode, and pushing the upper structure by using a jack through a stop block and a stone pad to transversely reset the upper structure;
s10, after the restoration of the upper structure supporting system is completed, the supporting effect of the steel pipe lattice piers 6 on the beam plate structure is removed, the steel pipe lattice piers 6 can be dismantled, the dismantling procedure and the installation procedure are reversed, the dismantling is carried out in the sequence of top to bottom, first assembling and then dismantling, and then second assembling and first dismantling, and the whole disease treatment work is finished.
When this scheme construction was gone on, reply bridge floor traffic controls:
during the erection of the steel pipe lattice pier 6, firstly, half single lane traffic control is carried out on a bridge construction area, before the original structure supporting system is converted, temporary closed traffic control needs to be carried out on the bridge, after the force bearing system swivel is completed, half single lane traffic control is continued, and during the half single lane traffic, according to design and expert requirements, the positions of traffic lanes and underbridge construction pier columns are staggered and cannot be overlapped.
Meanwhile, in order to further avoid influence of vehicles on the bridge on the underbridge construction during traffic control, speed limit needs to be carried out on vehicles passing on the bridge, the control distance is lengthened, and high-speed public security needs to be requested to carry out strong reminding speed limit control at two ends of a control area.
Quality control and monitoring control in the implementation process of the scheme are as follows:
the construction method is carried out according to corresponding standard specifications of 'road and bridge construction technical Specification' (JTG/T F50-2011), 'road and bridge reinforcement construction technical Specification' (JTG/T J23-2008) and 'concrete structure reinforcement design Specification' (GB 50367 and 2013), and meanwhile, the following quality control and monitoring work is emphasized:
(1) monitoring pier column displacement and stable cable force;
(2) monitoring the displacement of the steel wire rope clamp;
(3) anchor bearing platform construction quality, stable cable fixing and connection quality;
(4) lattice pier, overhead crane installation quality: strictly controlling the quality and the verticality of the welding line;
(5) the size of the limiter and the slope adjuster during jacking, the welding quality and the like;
(6) pile foundation construction: strictly controlling the performance index and sediment thickness of pile foundation pore-forming slurry, mixing concrete according to a mixing proportion, checking and accepting the concrete in time after the concrete enters a field, and pouring the concrete after the concrete is qualified;
(7) pier column construction: concrete quality and pier column verticality.
The safety measures in the implementation process of the scheme are as follows:
(1) establishing a perfect safety organization and establishing a sound and various feasible regulations and regulations;
(2) strengthening safety education and drilling, and regularly carrying out safety propaganda and education to ensure that each constructor firmly establishes safety consciousness;
(3) monitoring the pier stud displacement and the cable force value all weather, and making related data reporting regulations and limit values;
(4) and a safety interaction mechanism is established by each participating unit such as a construction unit, a design unit, a monitoring unit, a construction unit, a supervision unit and the like, so that the safety construction is ensured. Each key process is converted, monitoring data is needed, and all units negotiate and steadily advance;
(5) the key processes can be organized and constructed after compiling a special scheme and being demonstrated by experts;
(6) the inspection and replacement of the steel wire rope of the reinforced winch are enhanced; the mud concentration detection is enhanced, and hole collapse is prevented; mounting and temporarily fixing the reinforcing steel bar cage and the steel casing;
(7) the cutting and hoisting of the main structure of the bridge must be carried out by special workers, so that the hoisted objects are prevented from colliding with the lattice piers;
(8) all the measures of the temporary structure and the operation platform are calculated and verified, and the safety is technically guaranteed;
(9) the bridge floor is provided with a traffic safety warning sign plate.
The environmental protection measures in the implementation process of the scheme are as follows:
the pile foundation construction slurry is transported to a waste soil yard, and after the project is finished, the waste turnover materials are timely transported away from the yard, so that the environmental pollution is avoided.
The inclined pier repairing method is small in social influence, normal traffic can be recovered quickly under the condition that the bridge is repaired with guaranteed quality and quantity, inconvenience caused by traffic interruption is avoided, the social influence is reduced as much as possible, social benefits are greatly improved, good economic benefits are obtained, particularly, a pier stabilizing mode in the construction process is the first case of the whole country, and the gap of bridge reinforcing technology is filled.
The scheme of rescue, danger elimination, restoration and reconstruction engineering of No. 5 bridge piers of the east connecting line red dam interchange of the Yibin new airport:
the Yibin new airport east connecting line engineering is located in a Cui screen area Minjiang new area, the B ramps are ramps which are connected from east connecting lines downwards to south lines of the red dam road in the urban area direction, the number of the B ramps is 21, 6, 630m in total, and the width of the bridge deck is 10.25 m. The B5# pier adopts a foundation form of adding a bearing platform to a pile foundation, the pile foundation is 4 pieces of T-shaped prestressed beams with the diameter of 1.8m, the length of 29m, the length of 8m, the width of 6.6m, the thickness of 2.5m and the height of a pier column of 40m, the lower section of the hollow thin-walled pier is adopted, the lower section of the hollow thin-walled pier is 8m along the bridge direction, 7m along the transverse bridge direction, the upper section of the hollow thin-walled pier is 2.6m along the bridge direction, 7m along the transverse bridge direction, the length of a cover beam is 9.55m, the width of 2.8m and the height of 2.5m, and the upper structure of the hollow thin-walled pier is 4 pieces of prestressed beams with the length of 40 m.
Because the third party unevenly piles the earthwork at the periphery of the pier stud, and related units treat the side adjacent to the river channel with smaller soil pressure, the sludge in the river channel is removed, the foundation unbalance loading is caused, and finally diseases such as pile foundation breakage, displacement, pier inclination and the like are caused, after the abnormity appears, the management unit entrusts related units to detect, and the deviation situation of the B5# pier is explained according to the report of Yibin airport east connecting line kwan-yin rock B5# pier deviation and settlement monitoring and the site survey situation of 8 and 25 days in 2020, 8 and 25 months: the pier bottom accumulated offset of the B5# pier is 3.1751m, the longitudinal accumulated offset is-2.5948 m, the vertical direction is-1.3037 m, the pier top accumulated offset is 0.5997m, the pier top accumulated offset is-0.2785 m, and the pier column still slowly displaces in the construction process.
And (3) evaluating the construction scheme after construction is finished: the construction process belongs to a self-creation type construction process, the construction risk coefficient is reduced to the minimum on the premise that a local owner does not want to cause larger social influence, the pier pile replacement technology of pier stabilizing, system conversion and pier dismounting is successfully applied, the pier column which is inclined to a large extent is safely dismounted, and the safety of subsequent construction is ensured.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A stable inclined pier construction method without interrupting traffic operation is characterized by comprising the following steps:
s1, respectively arranging a stabilizing cable anchor ingot at the four-side symmetrical position of the inclined pier, wherein the stabilizing cable anchor ingot consists of a pile foundation and a bearing platform type concrete anchor ingot;
s2, arranging a winch anchor ingot and a traction winch at the position adjacent to each stabilizing cable anchor ingot, and fixing and limiting the traction winch;
s3, arranging pulley blocks at the bottom of the inclined pier, connecting the inclined pier with four stable cable anchor ingots in different directions by using a steel wire rope stable cable bag bundle, arranging a dynamometer at the end of each pulley block, tensioning the steel wire rope stable cable tension to the calculated data by a traction winch, a chain block and a jack, and preliminarily stabilizing the bottom of the inclined pier;
s4, arranging a pulley block group along the pier body of the inclined pier, connecting the inclined pier and four stable cable anchor ingots in different directions by using a steel wire rope stable cable bag bundle, arranging a dynamometer at the end part of the pulley block group, and tensioning the steel wire rope stable cable tension to calculation data by a traction winch, a chain block and a jack so as to further stabilize the pier body of the inclined pier;
s5, arranging steel pipe lattice piers on two sides of the inclined pier;
s6, by means of jacking and supporting, bearing the structural load on the upper part of the inclined pier on the steel pipe lattice pier, and adjusting the tension value of the steel wire rope stabilizing cable according to the calculated value in the jacking process to maintain the inclined pier in a balanced state;
s7, arranging a hoisting crown block system on the bridge floor above the inclined pier, dismantling the inclined pier through a hoisting winch, a rope saw and a suspension cage, moving down the pier body stabilizing rope layer by layer in the dismantling process of the inclined pier, and maintaining the force system to be stable by adjusting the horizontal stabilizing ropes in four directions and the pier body stabilizing rope;
s8, constructing a new pile foundation and a new pier stud;
s9, transferring the load of the upper structure of the bridge on the newly-built pier column through jacking to complete the replacement of the stress system and perform jacking transverse reset on the upper structure;
and S10, removing the steel pipe lattice piers, and enabling the bridge to recover normal traffic operation.
2. The method for constructing the stable inclined pier without interrupting the traffic operation according to claim 1, wherein pier displacement monitoring points are arranged around the inclined pier body to continuously monitor the inclined pier, and whether the construction is continued is determined according to the deviation condition of the inclined pier.
3. The method of claim 1, wherein the pier body stabilizing cable and the horizontal stabilizing cable are monitored by a dynamometer, displacement monitoring points are provided around the stabilizing cable anchor and the winch anchor, and whether or not to continue construction is determined according to the monitored data.
4. The construction method of the stable inclined pier without interrupting traffic operation according to claim 1, wherein lattice pier displacement monitoring points are arranged around the steel pipe lattice piers to continuously monitor the steel pipe lattice piers, and whether to continue construction is determined according to the deformation values of the steel pipe lattice piers.
5. The method for constructing a stable pier without interrupting traffic of claim 1, wherein in the step S1, the distance between the anchor blocks of the stabilizing cables in four directions and the pier should be not less than the collapse and fall radius of the pier and the superstructure to prevent the bridge from collapsing and damaging the constructors, and the space for existing structures and the crane in the later period should be taken into consideration.
6. The method for constructing a stable pier inclined without interrupting traffic operation of claim 1, wherein before the step S4, a high pressure jet grouting pile construction process is further used to reinforce the foundation around the pier inclined.
7. The method for constructing a stable inclined pier without interrupting traffic operations as claimed in claim 1, wherein in the step S5, the steel pipe lattice pier is formed in a v-21274h-shaped structure as a whole, and one side of the cross-sections of the bearing platforms at both sides of the steel pipe lattice pier is a rectangular structure and the other side thereof is a trapezoidal structure in view of the requirements for the horizontal stabilizing cables, the pier body stabilizing cables and the upper load of the steel pipe lattice pier.
8. The method for constructing a stable inclined pier without interrupting traffic operation according to claim 1, wherein in the step S6, when the inclination angle of the inclined pier is too large, a flexible limiting device is provided to limit the T-beam above the inclined pier in order to prevent the T-beam from colliding with an adjacent road and being damaged during jacking.
9. The method for constructing a stable inclined pier without interrupting traffic according to claim 1, wherein in the step S7, after the bridge floor above the inclined pier is broken, a steel pipe, a steel rail, a channel, a steel wire rope, a pulley, and a hoisting winch are used to manufacture a hoisting crown block system on the bridge floor, and in order to reduce the damage to the whole bridge caused by the hoisting operation, the steel rail is positioned to coincide with the steel pipe lattice pier below.
10. The method for constructing a stable inclined pier without interrupting traffic operation according to claim 1, wherein in the step S8, in order to reduce disturbance of the ground, the pile foundation, the bearing platform and the pier are newly built at positions avoiding the original bearing platform and the pile foundation without removing the bearing platform and the pile foundation under the original inclined pier, and the bearing platform is newly built above the original bearing platform.
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