CN114855654B - 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
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling 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
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- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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Abstract
The invention provides a construction method of a stable inclined pier without interrupting traffic operation, which comprises the steps of limiting the inclined pier through the arrangement of a stable rope anchor ingot, a winch anchor ingot, a horizontal stable rope and a pier body stable rope, constructing a steel pipe lattice pier around the inclined pier, placing the upper load of the inclined pier on the steel pipe lattice pier, then newly constructing a bridge pier column, and finally removing the steel pipe lattice pier to complete the whole construction process. The inclined pier repairing method has small social influence, can quickly recover normal traffic under the condition of protecting and maintaining the bridge, avoids inconvenience caused by traffic interruption, reduces social influence as much as possible, greatly improves social benefit, obtains better economic benefit, and particularly fills the gap of the bridge reinforcing technology, wherein the 'pier stabilizing mode' in the construction process is the first example of the whole country.
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
Along with the rapid development of bridge construction in China, diseases of the bridge frequently occur in the bridge construction and use process, and the treatment of the bridge diseases is increasingly highlighted, such as displacement, fracture and damage of a bridge pile foundation caused by uneven pile loading of earthwork, water pressure, earthquake or other reasons, so that the lower part and the upper part of the bridge are greatly inclined, the bridge has great potential safety hazard, the safety use of the bridge is seriously influenced, and the bridge can be restored to a normal safe use state after necessary treatment is carried out on the bridge.
The bearing capacity of the disease pile foundation cannot be judged, the pier column is still in the slow displacement state, the system is likely to approach to the critical equilibrium state, under the action of small external force, bridge collapse and casualties can possibly occur in the danger elimination construction process, and the risk is extremely high, so that the traditional treatment methods such as blasting, dismantling from top to bottom and the like are not applicable any more, and the bridge road main body is subjected to great damage by adopting the method for treatment, and the bridge road main body cannot be in general operation in a long period of repairing, and has great social influence and influence on economic benefit.
Disclosure of Invention
The invention aims to provide a stable inclined pier construction method without interrupting the traffic operation, which can be suitable for bridge disease treatment of replacing the original bridge pier column and pile foundation under the condition that the bridge pile foundation is displaced, broken and destroyed to cause the lower part and the upper part of the bridge to be inclined greatly and still be in slow displacement.
The embodiment of the invention is realized by the following technical scheme:
the construction method of the stable inclined pier without interrupting traffic operation specifically comprises the following steps:
s1, respectively arranging a stable rope anchor ingot at the square symmetrical position of an inclined pier, wherein the stable rope anchor ingot consists of pile foundations and bearing platform type concrete anchor ingots;
s2, arranging a winch anchor ingot and a traction winch at the adjacent position of each stable rope anchor ingot, and fixing and limiting the traction winch;
s3, arranging a pulley block at the pier bottom of the inclined pier, connecting the inclined pier with four stable rope anchor ingots in different directions by using a steel wire rope stable rope pocket bundle, arranging a dynamometer at the end part of each pulley block, and tensioning the steel wire rope stable rope tension to calculated data through a traction winch, a chain hoist and a jack to initially stabilize the pier bottom of the inclined pier;
s4, arranging a pulley block along the pier body of the inclined pier, connecting the inclined pier with four stable rope anchor ingots in different directions by using a steel wire rope stable rope pocket bundle, arranging a dynamometer at the end part of the pulley block, and tensioning the steel wire rope stable rope to calculated data by a traction winch, a chain hoist 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, completely bearing structural loads at the upper part of the inclined bridge pier on the steel pipe lattice pier in a jacking and supporting pad mode, and adjusting the value of the stable rope tension of the steel wire rope according to a calculated value in the jacking process to enable the inclined bridge pier to maintain a balanced state;
s7, arranging a hoisting crane system on the bridge deck above the inclined bridge pier, dismantling the inclined bridge pier through a hoisting winch, a rope saw and a hanging cage, downwards moving pier body stabilizing ropes layer by layer in the dismantling process of the inclined bridge pier, and maintaining a stable force system through adjusting the horizontal stabilizing ropes in four directions and the pier body stabilizing ropes;
s8, constructing new pile foundations and pier columns;
s9, bearing the load of the upper structure of the bridge on the newly-built pier column through jacking to replace a stress system, and pushing the upper structure to horizontally reset;
s10, dismantling the steel pipe lattice pier, and recovering the normal traffic operation of the bridge.
Further, pier column displacement monitoring points are arranged around the inclined pier body, the inclined pier is monitored continuously, and whether construction is continued or not is determined according to the deviation condition of the inclined pier.
Further, the pier body stable rope and the horizontal stable rope are monitored through the dynamometer, displacement monitoring points are arranged around the stable rope anchor ingot and the winch anchor ingot, and whether construction is continued or not is determined according to monitoring data.
Further, lattice pier displacement monitoring points are arranged around the steel pipe lattice piers, the steel pipe lattice piers are monitored continuously, and whether construction is continued or not is determined according to deformation values of the steel pipe lattice piers.
In the step S1, the distance between the four stable cable anchor ingots and the inclined bridge pier should not be lower than the collapse radius of the inclined bridge pier and the upper structure, so as to prevent the bridge collapse from injuring constructors, and consider the space of the existing structure and the operation space of the later crane.
And further, before the step S4 is implemented, the foundation around the inclined pier is reinforced by adopting a high-pressure jet grouting pile construction process.
In the step S5, the steel pipe lattice pier is in a -shaped structure as a whole, and one side of the section of the bearing platform at two sides of the steel pipe lattice pier is in a rectangular structure, and the other side of the section of the bearing platform is in a trapezoid structure due to the requirements on the horizontal stabilizing rope, the pier body stabilizing rope and the upper load of the steel pipe lattice pier.
Further, in step S6, when the inclination of the pier is too large, the stopper is pressed and attached to the left or right stopper of the road to break the stopper, in order to prevent the T-beam from falling down to the road along the existing movement trend after being separated from the capping beam and causing the adjacent road to collide and damage, a flexible limiting device is arranged to limit the T-beam, the flexible limiting device mainly comprises 2 steel cables with the length of 2m 45 and phi 36.5, and the device pulls and pulls the T-beam to avoid damage caused by rigid contact.
In the step S7, after the bridge deck above the inclined bridge pier is broken, a hoisting overhead traveling crane system is manufactured on the bridge deck by adopting a steel pipe, a steel rail, a channel steel, a steel wire rope, a pulley and a hoisting winch, and in order to reduce damage to the whole bridge caused by hoisting operation, the steel rail position is coincident with the steel pipe lattice pier below.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:
1. the inclined pier repairing method has higher safety, can effectively maintain the balance of the original force system, does not cause the abrupt change of the original force system, thereby maintaining the stability of the inclined pier, realizing the orderly execution of the construction steps, avoiding the use of large-scale equipment such as bridge girder erection machines and the like, and being applicable to more scenes;
2. the inclined pier repairing method has small social influence, can quickly recover normal traffic under the condition of protecting and maintaining the bridge, avoids inconvenience caused by traffic interruption, reduces social influence as much as possible, greatly improves social benefit, obtains better economic benefit, and particularly fills the gap of the bridge reinforcing technology, wherein the 'pier stabilizing mode' in the construction process is the first example of the whole country.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a construction flow chart of the present invention;
FIG. 2 is a schematic perspective view of a pier body stabilizing rope and a horizontal stabilizing rope according to the present invention;
fig. 3 is a schematic diagram of the front structure of the steel pipe lattice pier and the inclined pier according to the present invention.
Icon: 1. tilting the pier; 2. pier body stabilizing ropes; 3. a horizontal stabilizing line; 4. stabilizing the cable anchor; 5. a winch anchor ingot; 6. steel pipe lattice pier.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, 2 and 3, a stable inclined pier construction method without interrupting traffic is mainly used in the case that a pier supporting a bridge main body moves slowly and obliquely, a conventional scheme generally uses a method of newly building or dismantling upper and lower parts of an inclined pier 1 after blasting, and both the two methods have more or less drawbacks:
if a new blasting scheme is adopted, the new construction period is long, the road breaking time is long, vehicles cannot pass completely, the social influence is extremely large, and in terms of safety, if the blasting is unsuccessful, a bridge support system becomes more unfavorable or causes the interlocking tilting reaction of adjacent pier columns, and the safety risk is larger;
if the method of dismantling the upper and lower parts of the inclined bridge pier 1 is adopted, the newly-built engineering period is long, the road breaking time is long, the vehicles cannot pass completely, the social influence is extremely large, in the aspect of safety, the bridge supporting system can approach to the critical balance state, under the action of small external force, the bridge collapse and the casualties can occur in the danger elimination construction process, the risk is extremely large,
therefore, the two methods have larger limitations, based on the deep thinking and research of the problems, and through the practice of the recovery reconstruction engineering (hereinafter referred to as Yibin new airport project) of the Yibin new airport east connecting line red dam interchange B ramp 5# bridge pier rescue evacuation endanger, the scheme is considered to be relatively safe, reliable, economical and applicable, and deserves to be applied and popularized in the treatment of the bridge diseases of the same type, and the construction method can be applied to the bridge disease treatment of the bridge pile foundation which is displaced, broken and destroyed to cause the lower part and upper part structures of the bridge to be greatly inclined and still be in slow displacement under the condition of not suspending the bridge traffic operation, and specifically comprises the following steps:
as shown in fig. 1 and 2, after determining the position of the inclined bridge pier 1, setting a stable cable anchor 4 in four directions around the inclined bridge pier 1, wherein the distance between the stable cable anchor 4 in the four directions and the inclined bridge pier 1 is not lower than the collapse radius of the inclined bridge pier 1 and the upper structure, so as to prevent the bridge from collapsing and injuring constructors, the horizontal stable cable 3 and the pier body stable cable 2 are arranged between the stable cable anchor 4 and the inclined bridge pier 1, the positions of the four stable cable anchor 4 are symmetrical with each other, so that the force system resultant force direction of the plane is convenient to control, the inclined direction of the inclined bridge pier 1 is further guided, the inclined bridge pier 1 is prevented from being twisted due to the stress of the horizontal stable cable 3 and the pier body stable cable 2, and the space for the existing structures, the horizontal stable cable 3, the pier body stable cable 2 and a later crane is considered;
in this embodiment, the stable rope anchor 4 is composed of pile foundations and a bearing platform type concrete anchor, the pull forces of the horizontal stable rope 3 and the pier body stable rope 2 are resisted mainly by the gravity of the anchor point and the friction force between the pile foundations and soil, the pile foundations of the anchor point and the relevant parameters of the bearing platform type concrete anchor are designed according to the geological report and the pull forces which the anchor point can receive before construction, in the new airport project of suitable for the guest, eight C30 pile foundations with the diameter of phi 150 are adopted as the stable rope anchor 4, the bearing platform size is 6.8 m.14m.3m, the bearing platform concrete label is C40, and piles among the eight C30 pile foundations are connected by adopting a worker 22, so that the integrity of the anchor point is enhanced.
In this embodiment, pier displacement monitoring points are set around the inclined pier 1, the inclined pier 1 is monitored continuously, and whether to continue construction is determined according to the deviation condition of the inclined pier 1.
S2, arranging a winch anchor ingot 5 and a traction winch at the adjacent position of each stable rope anchor ingot 4, fixing and limiting the traction winch, arranging the winch anchor ingots 5 in a safe area adjacent to the stable rope anchor ingots 4 according to the field condition, wherein the winch anchor ingots 5 adopt 4 phi 500 concrete steel pipe piles as pile foundations, and arranging two workers 45 at the outer back for connection;
s3, arranging a horizontal stable rope 3 between the pier bottom of the inclined pier 1 and the stable rope anchor ingots 4 and the winch anchor ingots 5, wherein the horizontal stable rope 3 consists of a jack, a pulley block, a steel wire rope, a shackle, a dynamometer, a traction winch and chain hoists, arranging the pulley block at the pier bottom of the inclined pier 1, connecting the inclined pier 1 with the four stable rope anchor ingots 4 in different directions by using steel wire rope stable rope bags, arranging the dynamometer at the end part of each pulley block, and tensioning the steel wire rope stable rope tension to calculated data by the traction winch, the chain hoists and the jack to initially stabilize the pier bottom of the inclined pier 1;
in this embodiment, the specification parameters of the materials related to the horizontal stabilizer rope 3 should be determined by calculation according to the required tension, and in the new airport project, the required specification of the materials includes: the jack is a steel wire rope with the diameter of 3 phi 36.5mm, the specification is 6 multiplied by 37+FC, a pulley with the diameter of 80T, a steel wire rope with the diameter of 24mm, a shackle with the diameter of 85T, a chain hoist with the diameter of 10T and a traction winch with the diameter of 5T.
When arranging the horizontal stabilizing rope 3, firstly, a pulley block is firstly arranged: eight 80t three-door trolleys are used for dividing the direction of each stable rope anchor ingot 4 into two groups of trolley groups, each group of four trolleys, each group of trolley groups is penetrated by 12 wires through a single phi 24mm steel wire rope, and a dead rope end of the steel wire rope is connected with a dynamometer and is connected with a monitoring room;
secondly, a jack is arranged: each group of jacks consists of 3 phi 36.5 steel wire ropes and is used for bundling pile foundations of the inclined bridge pier 1 and the steady rope anchor ingots 4, each group is fixedly provided with an 85T shackle, the shackle is connected with an 80T pulley block, eight groups of jacks are arranged in the directions of four steady rope anchor ingots 4, and four groups of pier columns and four groups of anchor points are arranged;
finally, horizontal stabilizing rope 3 should be stretched: the tension value of the horizontal stable rope 3 is calculated and determined according to the balance condition of the inclined bridge pier 1, in a new airport project, the resultant force of the horizontal stable rope 3 at each stable rope anchor ingot 4 is 120T-240T, in order to ensure stable force system during tensioning, a 10T chain hoist or a 5T traction winch is used as driving force for synchronous symmetrical grading tensioning, each 1T is first small and then large, each 5T is first grade after exceeding 15T, each grade is first grade, the tension is gradually carried out to a calculated value, among the four horizontal stable ropes 3, the force value of the horizontal stable rope 3 opposite to the displacement direction of the bottom of the inclined bridge pier 1 is mainly controlled, the rest horizontal stable ropes 3 are mainly controlled to be properly tightened, and the resultant force direction is kept to point to the stable rope anchor ingot 4 opposite to the displacement direction of the inclined bridge pier 1.
After the horizontal stabilizing rope 3 is 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 effect of the method is different 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, a pier body stabilizing rope 2 is arranged between the pier body of the inclined pier 1 and the stabilizing rope anchor ingot 4 and the winch anchor ingot 5, the pier body stabilizing rope 2 consists of a jack, a limiting steel bar, a pulley block, a steel wire rope, a shackle, a dynamometer, a traction winch and a chain hoist, the pulley block is arranged along the pier body of the inclined pier 1, the inclined pier 1 is connected with the four stabilizing rope anchor ingots 4 in different directions by using a steel wire rope stabilizing rope pocket bundle, the dynamometer is arranged at the end part of the pulley block, and the steel wire rope stabilizing rope tension is tensioned to calculated data by the traction winch, the chain hoist and the jack, so that the pier body of the inclined pier 1 is stabilized;
in this embodiment, the specification parameters of the materials related to the pier body stabilizing rope 2 should be determined by calculation according to the required tension, and in the new airport project, the required specifications of the materials include: the jack is a steel wire rope with the diameter of 3 phi 36.5mm, and the specification is 6 multiplied by 37+FC, a steel rod with the diameter of 100, an 80T pulley, a steel wire rope with the diameter of 24mm, an 85T shackle, a 10T chain hoist and a 5T traction winch.
When arranging the pier shaft stabilizing rope 2, firstly, a pulley block is firstly arranged: eight 80t three-door trolleys are used for dividing the direction of each stable rope anchor ingot 4 into two groups of trolley groups, each group of four trolleys, each group of trolley groups is penetrated by 12 wires through a single phi 24mm steel wire rope, and a dead rope end of the steel wire rope is connected with a dynamometer and is connected with a monitoring room;
secondly, a jack is arranged: the riding cage is formed by inserting phi 100 steel bars with the length of 1m into phi 110 holes which are formed by 60cm in the pier body of the inclined pier 1 by adopting a water mill drill, and tightly filling gaps, so that the displacement of the jacks is prevented, the jacks are manually matched with a crane to install the jacks, each group of jacks consists of 3 phi 36.5 steel wire ropes and are in pocket bundling connection with the inclined pier 1 and the stable rope anchor ingots 4, each group of jacks is fixedly provided with an 85T shackle, the shackle is connected with an 80T pulley block, eight groups of jacks are arranged in the direction of each stable rope anchor ingot 4, and four groups of jacks are arranged along the pier body of the inclined pier 1 and four groups of stable rope anchor ingots 4;
then connecting the pulley block with the jack by tilting the reverse direction of the tilting of the bridge pier 1 and then tilting the tilting direction of the bridge pier 1 from top to bottom through the crane;
and finally, stretching the pier body stabilizing rope 2: the tension value of the pier body stabilizing ropes 2 is calculated and determined according to the balance condition of the inclined bridge pier 1, in a new airport project, the total force of the pier body stabilizing ropes 2 at each stabilizing rope anchor ingot 4 is 120T-240T, the tension is gradually decreased from top to bottom, in order to ensure the stability of the force system during tensioning, 10T chain hoist or 5T traction winch is adopted as driving force to synchronously and symmetrically carry out graded tensioning, firstly, 1T is first of a grade, and after 15T is exceeded, each 5T is of a grade, the tension is gradually carried out to a calculated value, in the four pier body stabilizing ropes 2, the force value of the pier body stabilizing ropes 2 opposite to the inclination direction of the inclined bridge pier 1 is mainly controlled, the rest pier body stabilizing ropes 2 are mainly controlled by displacement, and are properly tightened, and the direction of the resultant force is kept to point to the stabilizing rope anchor ingot 4 opposite to the inclination direction of the inclination bridge pier 1.
Care should be taken in construction of pier body stabilizer 2 and horizontal stabilizer 3:
(1) a series of security measures such as security education, emergency exercise, communication conditions and the like are carried out before construction, and the smoothness of an emergency escape route and a medical route is ensured;
(2) the monitoring of the pier body stabilizing rope 2 and the horizontal stabilizing rope 3 takes displacement monitoring as the main part and rope force monitoring as the auxiliary part, the pier column is prohibited from larger displacement in the horizontal rope tensioning process, the accumulated displacement is controlled within +/-5 mm, if the monitored data have public grading change in the construction process, monitoring personnel should immediately call out through an interphone and simultaneously sound an alarm, an emergency plan is started, a traction winch operator carries out emergency braking of the traction winch, and all personnel on site withdraw according to the direction appointed by the drilling;
(3) after the horizontal stabilizing rope 3 is stressed, mechanical equipment is prevented from being rolled and welded to damage the horizontal stabilizing rope 3 in the fire operation, and the horizontal stabilizing rope 3 is tightly attached to the ground due to the fact that 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 4, the horizontal stabilizing rope 3 is protected, and a steel bridge is additionally arranged to enable the equipment to span a rope.
During construction, the pier body stabilizing rope 2 and the horizontal stabilizing rope 3 are monitored through the dynamometer, displacement monitoring points are arranged around the stabilizing rope anchor ingot 4 and the winch anchor ingot 5, and whether construction is continued or not is determined according to monitoring data.
S5, as shown in fig. 1 and 3, arranging steel pipe lattice piers 6 on two sides of the inclined pier, wherein the steel pipe lattice piers 6 consist of steel pipe piles, bearing platforms, steel pipe columns and cross beams, and relevant dimension parameters are calculated and determined according to the load of the upper structure of the bridge, and the concrete construction steps comprise;
(1) in a Yibin new airport project, bearing platforms are arranged along a 5# pier transverse bridge towards two sides, a bearing platform pile foundation consists of 6 steel pipe piles, the distance between the steel pipe piles along the transverse bridge direction is 4.5m, the distance between the steel pipe piles along the along-bridge direction is 3.5m, the specification of the steel pipe piles is phi 1220 x 11mm, a 120-type vibrating hammer is adopted in construction, a bedrock surface is driven, the steel pipe pile penetration is smaller than 5mm/min, the insertion and the beating are confirmed, the top surfaces are transversely connected by adopting 22b I-steel to form a whole, the tops of the steel pipe piles extend into 130cm of the bearing platform, 3 steel pipe piles extend into 130cm in the right side, and the other 3 steel pipe piles are 130cm, and when the distance span of the steel pipe piles is more than or equal to 6m, 39 m I-steel pipes are additionally arranged at the top ends of the adjacent steel pipe piles to improve the punching resistance of the bearing platform;
(2) in order to meet the requirements on the load of the horizontal stable rope 3, the pier body stable rope 5 and the upper beam body of the steel pipe lattice pier 6, one side of the cross section of the bearing platform at two sides of the steel pipe lattice pier 6 is of a rectangular structure, the other side of the cross section of the steel pipe lattice pier 6 is of a trapezoid structure, the elevation of the bottom of the bearing platform is consistent with the elevation of the prior bottom surface in order to avoid the disturbance of the operation of earth excavation machinery, the horizontal stable rope 3 is connected with the pier ground of the inclined pier 1 and the pile foundation of the stable rope anchor ingot 4, so that the horizontal stable rope 3 clings to the ground and is protected against the horizontal stable rope 3, and when the position of the horizontal stable rope 3 is intersected with the bearing platform, the horizontal stable rope 3 passes through the bearing platform through a phi 50PE pipe;
(3) the steel bars at the top and bottom layers of the bearing platform are double-layer phi 20 steel bar meshes, the spacing between the steel bars (meshes) is 15 x 15cm, the spacing between the tie bars is 30cm, namely one tie bar is arranged, the number of the tie bars penetrating through the steel pipe pile is not less than 3 for reinforcing the steel pipe pile and the steel bars at the bottom layer of the bearing platform for connecting the bearing platform, the rest of the steel bars are adjusted to avoid, and the pre-buried members and the horizontal stabilizing ropes are avoided when concrete is poured and vibrated;
(4) the steel pipe pile foundation is embedded with a 3cm thick steel plate, bolts are embedded, eyelets are consistent with the steel pipe upright posts, and newly welded L-shaped 25 steel bars are penetrated through the steel plate to increase the stability of connection with the bearing platform;
(5) as shown in fig. 3, after the construction of the bearing platforms is completed, 6 steel pipes with phi 800×16mm are arranged on the top surfaces of the bearing platforms at two sides, the center distance of the bearing platforms at two sides is 22.5m, the clear distance is 17.2m, in the new airport project of Yibin, the height of each steel pipe lattice pier 6 is 39.785m, each steel pipe lattice pier 6 is formed by adding 1 column leg section to 3 standard sections, the height of each standard steel lattice piece is 12m, in order to reduce the deflection of the top beam and increase the integrity of the lattice pier when Liang Tiding liters are reduced, two layers of beams are specially arranged between the upper ends of the steel pipes at two sides, transverse diagonal bracing is arranged between the beams, 4H 650×300×20h steel beams are arranged above the diagonal bracing, the steel pipe lattice pier 6H steel beams are Q345 steel, and the rest components are Q235 steel.
In the new airport project of suitable guest, the steel pipe lattice pier 6 is in a structure as a whole, lattice pier displacement monitoring points are arranged around the steel pipe lattice pier 6, the steel pipe lattice pier 6 is monitored continuously, 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 tube lattice pier 6 is installed and accepted according to a scheme design file and related technical specifications, an original structure supporting system can be converted, structural loads at the upper part of the inclined pier are completely transferred to the steel tube lattice pier in a jacking and supporting mode, and the tension value of a steel wire rope stabilizing rope is adjusted according to a calculated value in the jacking process so that the inclined pier maintains a balanced state;
in the new airport project of suitable bin, slope pier 1 upper portion T roof beam slope range is great, has sticis the laminating with road right side dog and causes the dog to break, in order to prevent that the T roof beam from breaking away from behind the bent cap along current motion trend to the road right side slope landing, if adopt rigidity spacing, then probably can produce the destruction to the T roof beam at T roof beam jacking in-process, so set up flexible stop device specially and carry out spacing to the T roof beam, flexible stop device mainly comprises 2 long 2m worker 45, phi 36.5 cable, the device pulls and draws the T roof beam, avoid rigid contact to lead to its damage.
In the new airport project of suitable guest, because the bridge deck of this project is inconsistent in the vertical reset height of the left and right sides, the reset track is an arc, in order to guarantee the jack and beam bottom contact surface, specially set up the hinge type and transfer the slope ware and guarantee jack and T roof beam contact surface, in order to improve the security.
When jacking, the PLC is arranged to control the hydraulic synchronous system to slowly bear the upper structure originally supported on the inclined pier 1 on the steel pipe lattice pier 6 through graded jacking, so that the inclined pier 1 does not bear the load of the upper structure any more, namely the conversion of the upper structure supporting system is completed, as the vertical pressure of the inclined pier 1 can be reduced during jacking, the jacking force is slowly increased to avoid instability of the inclined pier 1, and the cable forces of the horizontal stabilizing cable 3 and the pier body stabilizing cable 2 are regulated according to the jacking force and the displacement change condition of the inclined pier 1, and the vertical component force of the horizontal stabilizing cable 3 and the pier body stabilizing cable 2 is increased to reduce the adverse effect caused by the loss of the upper structure pressure of the inclined pier 1, so that the inclined pier 1 is maintained in a balanced state.
S7, after the bridge deck above the inclined bridge pier 1 is broken, a hoisting crane system is manufactured on the bridge deck by adopting a steel pipe, a steel rail, a channel steel, a steel wire rope, a pulley and a hoisting winch, in order to reduce damage to the whole bridge caused by hoisting operation, the steel rail position is coincident with a steel pipe lattice pier 6 below, the inclined bridge pier 1 is removed by the hoisting winch, a rope saw and a hoisting cage, and is hoisted to the ground and cleared by the crane, in the process of removing the inclined bridge pier 1, the pier body stabilizing ropes move downwards layer by layer, and the force system is maintained stable by adjusting the horizontal stabilizing ropes 3 and the pier body stabilizing ropes 2 in four directions;
s8, in order to reduce foundation disturbance, a pile cap and a pile foundation at the original inclined pier 1 are not removed, a new pile foundation, a pile cap and a pier are selected to avoid an original pile position, a new pile cap is built above the original pile cap, a water mill brick is adopted for reaming in an original pile cap section, and a rotary digging pile is adopted for construction below the original pile cap, so that a new structure is completed;
s9, after the strength of the newly-built bridge pier capping beam and the masonry concrete reaches the design strength, restoring the structure supporting system, namely supporting the structure temporarily supported on the steel pipe lattice pier 6 on the newly-built bridge pier and the capping beam in a jacking and oil return beam falling mode again, pushing the upper structure by using a jack for a stop block and a masonry, and transversely resetting the upper structure;
s10, after the restoration of the upper structure supporting system is completed, the supporting function of the steel pipe lattice pier 6 on the beam plate structure is relieved, the steel pipe lattice pier 6 can be removed, the removing program and the installing program are reciprocal, and the whole disease treatment work is finished.
When construction of the scheme is carried out, bridge deck traffic is controlled:
during the erection of the steel pipe lattice pier 6, firstly, semi-single-lane traffic control is carried out on a bridge construction area, before the original structure supporting system is converted, temporary closed traffic control is needed to be carried out on the bridge, after the stress system swivel is completed, the semi-single-lane traffic control is continued, and during the semi-single-lane traffic, the traffic lanes are staggered with the under-bridge construction pier column according to the design and expert requirements and cannot be overlapped.
Meanwhile, in order to further avoid the influence of vehicles on the bridge on construction under the bridge during traffic control, the speed of the passing vehicles on the bridge needs to be limited, the control distance is prolonged, and high-speed police is required to be requested to carry out strong reminding speed limiting control at two ends of a control area.
Quality control and monitoring control in the implementation process of the scheme:
the construction method is carried out according to corresponding standard specifications of highway bridge and culvert construction technical specifications (JTG/T F50-2011), highway bridge reinforcement construction technical specifications (JTG/T J-2008) and concrete structure reinforcement design specifications (GB 50367-2013), and meanwhile the following quality control and monitoring work is focused on:
(1) Monitoring pier column displacement and stable cable force;
(2) Monitoring displacement of a wire rope clamp;
(3) Anchor point bearing platform construction quality, stable cable fixing and connection quality;
(4) Lattice pier and crown block installation quality: strictly controlling the quality and the verticality of the welding seam;
(5) The quality of the limiter, the slope regulator, the welding and the like during the jacking period;
(6) Pile foundation construction: strictly controlling performance indexes of pile foundation pore-forming slurry and thickness of sediments, mixing concrete according to a mixing ratio, checking and accepting the concrete in time after the concrete enters a field, and pouring according to a qualified checking method;
(7) Pier column construction: concrete mass and pier column verticality.
Safety measures in the implementation process of the scheme:
(1) Establishing a perfect safety organization and establishing various feasible regulations;
(2) Strengthening safety education and exercise, and carrying out safety propaganda and education regularly so that each constructor firmly builds up safety consciousness;
(3) All-weather monitoring pier column displacement and cable force values, and formulating relevant data reporting regulations and limit values;
(4) And each participating unit such as a construction unit, a design unit, a monitoring unit, a construction unit, a supervision unit and the like establishes a safe interaction mechanism to ensure safe construction. Each key process conversion has to have monitoring data, and each unit negotiates together to advance steadily;
(5) The key procedures are all compiled into special schemes, and construction can be organized after expert demonstration;
(6) The inspection and replacement of the steel wire rope of the winch are enhanced; the detection of the slurry concentration is enhanced, and hole collapse is prevented; mounting and temporarily fixing reinforcing steel bar cages and steel casings;
(7) The main structure of the bridge is cut and hoisted by special operation workers to prevent hoisted objects from colliding with lattice piers;
(8) All temporary structure and operation platform measures are calculated and verified, so that the safety is technically ensured;
(9) The bridge deck is provided with traffic safety warning sign labels.
Environmental protection measures in the implementation process of the scheme:
and the pile foundation construction slurry is transported to a spoil field, and when the engineering is finished, the abandoned turnover material is transported away from the field in time, so that environmental pollution is avoided.
The inclined pier repairing method has small social influence, can quickly recover normal traffic under the condition of protecting and maintaining the bridge, avoids inconvenience caused by traffic interruption, reduces social influence as much as possible, greatly improves social benefit, obtains better economic benefit, and particularly fills the gap of the bridge reinforcing technology, wherein the 'pier stabilizing mode' in the construction process is the first example of the whole country.
The recovery reconstruction engineering profile is endangered by the rescue and evacuation of the B ramp 5# bridge pier of the east connecting line red dam of the new airport:
the east connecting line engineering of the Yibin new airport is positioned in the Minjiang new area of the Cui screen area, the B ramp is a ramp from east connection to downconnection to the south line of the red dam in the direction of the urban area, the total of the B ramp is 21 spans 6, the total of the B ramp is 630m, and the bridge deck is 10.25m wide. The B5# pier adopts a foundation form of adding a bearing platform, the pile foundation is 4 phi 1.8m, the length is 29m, the length of the bearing platform is 8m, the width is 6.6m, the thickness is 2.5m, the height of the pier column is 40m, a variable-section hollow thin-wall pier is adopted, the lower section is along 8m, the transverse bridge is 7m, the upper section is along 2.6m, the transverse bridge is 7m, the length of a capping beam is 9.55m, the width is 2.8m, the height is 2.5m, and the upper structure is 4 prestressed T beams with the length of 40 m.
Because the third party is unevenly piled and carried the earthwork around the pier stud, and the relevant units are used for treating the adjacent river channel at the side with smaller soil pressure, removing the river channel silt, causing the unbalanced load of foundation, finally causing the diseases such as pile foundation fracture, displacement, pier inclination and the like, after the abnormality occurs, the management unit entrusts about single position to detect, and according to the report of Yibin airport east connecting line guanyin rock B5# pier deviation and settlement monitoring and the on-site investigation condition of 25 days of 2020 8 months, the condition of B5# pier deviation is described: the pier bottom transverse bridge of the B5# pier is accumulated to be offset 3.1751m, the longitudinal bridge is accumulated to be offset-2.5948 m, the vertical direction is-1.3037 m, the pier top transverse bridge is accumulated to be offset 0.5997m, the pier top longitudinal bridge is accumulated to be offset-0.2785 m, and the pier column is still slowly displaced in the construction process.
Evaluation of the construction scheme after construction is completed: the construction process belongs to a self-invasive construction process, reduces the construction risk coefficient to the minimum on the premise that local owners do not want to cause larger social influence, successfully uses pier pile replacement technology of pier stabilization, system conversion and pier disassembly, safely removes the pier columns which are inclined to a large extent, and ensures the safety of subsequent construction.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A stable inclined pier construction method without interrupting traffic operation is characterized by comprising the following steps:
s1, respectively arranging a stable rope anchor ingot at the square symmetrical position of an inclined pier, wherein the stable rope anchor ingot consists of pile foundations and bearing platform type concrete anchor ingots;
s2, arranging a winch anchor ingot and a traction winch at the adjacent position of each stable rope anchor ingot, and fixing and limiting the traction winch;
s3, arranging a pulley block at the pier bottom of the inclined pier, connecting the inclined pier with four stable rope anchor ingots in different directions by using a steel wire rope stable rope pocket bundle, arranging a dynamometer at the end part of each pulley block, and tensioning the steel wire rope stable rope tension to calculated data through a traction winch, a chain hoist and a jack to initially stabilize the pier bottom of the inclined pier;
s4, arranging a pulley block along the pier body of the inclined pier, connecting the inclined pier with four stable rope anchor ingots in different directions by using a steel wire rope stable rope pocket bundle, arranging a dynamometer at the end part of the pulley block, and tensioning the steel wire rope stable rope to calculated data by a traction winch, a chain hoist 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, completely bearing structural loads at the upper part of the inclined bridge pier on the steel pipe lattice pier in a jacking and supporting pad mode, and adjusting the value of the stable rope tension of the steel wire rope according to a calculated value in the jacking process to enable the inclined bridge pier to maintain a balanced state;
s7, arranging a hoisting crane system on the bridge deck above the inclined bridge pier, dismantling the inclined bridge pier through a hoisting winch, a rope saw and a hanging cage, downwards moving pier body stabilizing ropes layer by layer in the dismantling process of the inclined bridge pier, and maintaining a stable force system through adjusting the horizontal stabilizing ropes in four directions and the pier body stabilizing ropes;
s8, constructing new pile foundations and pier columns;
s9, bearing the load of the upper structure of the bridge on the newly-built pier column through jacking to replace a stress system, and pushing the upper structure to horizontally reset;
s10, dismantling the steel pipe lattice pier, and recovering the normal traffic operation of the bridge.
2. The construction method for the stable inclined pier without interrupting traffic according to claim 1, wherein pier column displacement monitoring points are arranged around the inclined pier body, the inclined pier is monitored continuously, and whether construction is continued is determined according to the deviation condition of the inclined pier.
3. The method for constructing the stable inclined pier without interrupting the traffic operation according to claim 1, wherein the pier body stable rope and the horizontal stable rope are monitored by a dynamometer, displacement monitoring points are arranged around the stable rope anchor ingot and the winch anchor ingot, and whether to continue the construction is determined according to the monitoring data.
4. The method for constructing a stable inclined pier without interrupting traffic according to claim 1, wherein lattice pier displacement monitoring points are arranged around the steel pipe lattice pier, the steel pipe lattice pier is monitored continuously, and whether construction is continued is determined according to the deformation value of the steel pipe lattice pier.
5. The method for constructing the stable inclined pier without interrupting the traffic operation according to claim 1, wherein in the step S1, the distance between the four stable cable anchors and the inclined pier is not lower than the collapse and falling radius of the inclined pier and the upper structure, so that the damage to constructors caused by the collapse of the bridge is prevented, and the space for the operation of the existing structures and the later cranes is considered.
6. The method for constructing the stable inclined pier without interrupting the traffic operation according to claim 1, wherein the step S4 is further performed by reinforcing the foundation around the inclined pier by using a high-pressure jet grouting pile construction process.
7. The construction method of the stable inclined pier without interrupting traffic according to claim 1, wherein in the step S5, the steel pipe lattice pier is in a -shaped structure as a whole, and one side of the section of the bearing platform at two sides of the steel pipe lattice pier is in a rectangular structure, and the other side of the section of the bearing platform is in a trapezoid structure due to requirements on horizontal stabilizing ropes, pier body stabilizing ropes and upper loads of the steel pipe lattice pier.
8. The construction method of the stable inclined pier without interrupting traffic according to claim 1, wherein in the step S6, when the inclination angle of the inclined pier is too large, the inclined pier is tightly pressed and attached to a stop block on the left side or the right side of a road to cause the stop block to break, in order to prevent the T beam from falling down to the road along the existing movement trend after being separated from the capping beam and causing the adjacent road to collide and damage, a flexible limiting device is arranged to limit the T beam, the flexible limiting device mainly consists of 2 steel ropes with the length of 2m < 45 > and phi < 36.5 >, and the device pulls and pulls the T beam to avoid damage caused by rigid contact.
9. The construction method for the stable inclined pier without interrupting traffic operation according to claim 1, wherein in the step S7, after the bridge deck above the inclined pier is broken, a hoisting overhead travelling crane system is adopted in the bridge deck by adopting a steel pipe, a steel rail, a channel steel, a steel wire rope, a pulley and a hoisting winch mechanism, and in order to reduce damage to the whole bridge caused by hoisting operation, the steel rail position is coincident with the steel pipe lattice pier below.
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