CN110644380A - Mounting method for narrow space beam slab of widened engineering of large-span overpass - Google Patents
Mounting method for narrow space beam slab of widened engineering of large-span overpass Download PDFInfo
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- CN110644380A CN110644380A CN201910926013.4A CN201910926013A CN110644380A CN 110644380 A CN110644380 A CN 110644380A CN 201910926013 A CN201910926013 A CN 201910926013A CN 110644380 A CN110644380 A CN 110644380A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
Abstract
The invention relates to a method for installing a beam slab in a narrow space of a widening project of a long-span overpass, which comprises the four steps of field environment data acquisition, checking computer equipment type selection, beam slab transportation lifting and the like. The invention can effectively reduce the occupied area and the use area of a construction working surface and auxiliary facilities during the bridge widening operation, thereby effectively reducing the bridge widening construction cost and the damage and the influence on the surrounding environment, effectively improving the construction efficiency and the construction quality, and effectively meeting the requirements of the bridge widening construction operation under various complex construction conditions.
Description
Technical Field
The invention relates to a method for installing a narrow space beam slab of a widening project of a large-span overpass, belonging to the technical field of bridge construction.
Background
With the rapid development of economy in China, vehicles are continuously increased, and road traffic difficulty and congestion become a normal state. The functions of highways and urban roads are more and more unable to keep pace with the modern traffic development, widening and reforming the existing roads and bridges become main means for relieving the current traffic pressure, and are also effective ways for improving traffic capacity, and currently, in bridge widening construction, auxiliary facilities such as beam slab production, storage sites, beam slab transportation sidewalks and the like with large occupied areas are often required to be arranged on construction sites, so that in bridge widening construction, on one hand, the construction of the auxiliary facilities needs to occupy a large amount of land resources, which is often restricted by the surrounding environment, and the reformation of the environment increases the construction cost, thus the construction efficiency is seriously influenced; on the other hand, in the process of completing the bridge construction, the construction of the auxiliary facilities and the restoration of the original state not only increase the construction investment, but also prolong the construction time. In addition, in actual construction, part of the bridge is often located in environments with relatively narrow construction site spaces, such as urban dense building areas and irrigation and water conservancy facility dense areas, so that the traditional construction method and construction process often cause serious damage to surrounding building facilities, the construction cost is increased, meanwhile, the surrounding environment of the construction site is also greatly damaged and polluted, and the production and life of residents in the surrounding environment are seriously influenced.
Therefore, in view of the current situation, a construction method for hoisting a widened bridge beam slab in a narrow space is urgently needed to meet the requirement of hoisting construction of the beam slab in a bridge widening project.
Disclosure of Invention
The invention aims to overcome the defects and provide a method for mounting a beam slab when a large-span overline bridge widening project is in a narrow space.
In order to realize the purpose, the invention is realized by the following technical scheme:
a narrow space installation method for a widened engineering beam slab of a long-span overpass comprises the following steps:
s1, collecting the site environment data, firstly carrying out data mapping and collection on the height and width of the bridge to be widened in the construction site according to the construction requirement, and then carrying out data mapping and collection on the widened construction working face area, the working height, the construction pavement width, the geological structure and the beam slab knot to be constructedCarrying out data surveying and mapping acquisition on the structure characteristics, and numbering 4 from the middle line to the edge position of the bridge in sequence according to the positioning position of the beam plate to be installed#Boundary beam plate, 3#Center sill plate, 2#Center sill plate and 1#The boundary beam plate is used for summarizing all data for later use;
s2, checking the type selection of the computer equipment, according to the data collected in the step S1, firstly according to the step 4#Beam slab, 3#Beam slab, 2#Beam slab and 1#Calculating the weight and the hoisting operation span of the beam plate, calculating the hoisting load of hoisting equipment, the length of a suspension arm and the structural strength of a hoisting steel wire rope required during hoisting operation, selecting the type of the hoisting equipment according to the calculation result, checking the current site bearing capacity according to the weight of the hoisting equipment in full-load operation after the type selection in combination with the geological structure parameters collected in the step S1, and designing and reinforcing the construction operation bearing capacity according to the calculation result;
s3, transporting and erecting the beam slab, and after the construction of the step S2 is completed, using a transportation vehicle according to the 4 th#、3#、1#、2#Respectively transporting the beam slabs onto the existing bridge deck, wherein the pair 4 is performed#、3#、1#、2#In the process of transporting the beam plates, after the erection of the front-stage beam plate is finished, the rear-stage beam plate is transported to the bridge floor of the existing bridge, and the rest is done until all the beam plates are erected; in addition, in the pair 4#、3#、1#、2#In the girder erection work, the hoisting equipment determined in step S2 is sequentially operated from the center line to the edge of the bridge 4#Boundary beam plate, 3#Hoisting and constructing the middle beam and the beam plate, positioning the middle beam and the beam plate on the bridge pier of the new bridge to be widened, and then placing the middle beam and the beam plate 1 on the bridge deck of the bridge to be widened#The boundary beam and the beam plate are hoisted to a construction access road outside the bridge pier of the new bridge to be widened and are temporarily stored, and then hoisting equipment is used for hoisting the bridge deck 2 of the bridge to be widened#The middle beam plate is hoisted and positioned on a new bridge pier of a widened construction operation surface, and finally 1 positioned on the construction pavement is hoisted through hoisting equipment#The boundary beam and beam plate is hoisted and positioned on a new bridge pier of the widened construction working face, so that the widening is completedAnd (5) hoisting the bridge plate.
Further, in the step S2, when the bearing capacity of the site foundation is reinforced, the construction road width and the isolation strips with a width not less than 50cm are additionally arranged between the bridge piers and the surrounding buildings.
Further, it is characterized in that: in the step S3, in the step 4#Boundary beam plate, 3#Center sill plate, 2#Center sill plate and 1#When the boundary beam and beam slab is transported and temporarily stored, two sleepers are laid side by side at a position 1.5-2.5 m away from the end of the beam slab below the bottom plate of each beam slab, the sleepers and the beam slab are vertically arranged, the length of each sleeper is 1.5-2 times of the width of the bottom plate of each beam slab, two sides of two ends of each beam slab are symmetrically supported at the joint of the top plate and the web plate of each beam slab by adopting logs respectively, and the logs and the horizontal plane form an included angle of 50-70 degrees.
Further, it is characterized in that: in the step S3, 4#Beam slab, 3#Beam slab, 2#Beam slab and 1#In the hoisting process of the beam slab, 4#Beam slab, 3#Beam slab, 2#Beam slab and 1#The beam slab bottom plate is 30-50cm higher than the construction working face.
Further, it is characterized in that: in the step S3, the actual hoisting load of the hoisting equipment is 75% -80% of the rated hoisting load; the extending length of the suspension arm in the suspension arm hoisting operation is 70-80% of the maximum extending amount of the suspension arm of the hoisting equipment, and the included angle between the steel wire rope and the horizontal plane is not more than 50 degrees.
Further, in the step S3, the axes of the erected beam slabs to be hoisted are all distributed in parallel to the axis of the bridge, and the transportation vehicle before erection is as close as possible to the side of the guardrail of the existing bridge to be installed outside without affecting the hoisting operation.
The invention can effectively reduce the occupied area of the construction working surface and the auxiliary facilities during the bridge widening construction, thereby effectively reducing the bridge widening construction cost and the damage and the influence on the surrounding environment, effectively improving the construction efficiency and the construction quality, and effectively meeting the requirements of the bridge widening construction operation under various complex construction conditions.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic diagram of a ready-made construction layout in the embodiment;
FIG. 3 is a schematic diagram of a construction process according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure diagram of a construction condition position where the operation of a truck crane is carried out most unfavorably to the construction conditions.
Detailed Description
As shown in fig. 1 and 2, a method for installing a widened engineering beam slab in a narrow space of a long-span overpass comprises the following steps:
s1, collecting the site environment data, firstly carrying out data mapping and collection on the height and width of the bridge to be widened in the construction site according to the construction requirement, then carrying out data mapping and collection on the area of the widened construction working face, the working height, the width of the construction sidewalk, the geological structure and the structural characteristics of the beam plate to be constructed, and numbering 4 from the central line to the edge position of the bridge according to the positioning position of the beam plate to be installed in sequence#Boundary beam plate, 3#Center sill plate, 2#Center sill plate and 1#The boundary beam plate is used for summarizing all data for later use;
s2, checking the type selection of the computer equipment, according to the data collected in the step S1, firstly according to the step 4#Beam slab, 3#Beam slab, 2#Beam slab and 1#Calculating the weight and the hoisting operation span of the beam plate, calculating the hoisting load of hoisting equipment, the length of a suspension arm and the structural strength of a hoisting steel wire rope required during hoisting operation, selecting the type of the hoisting equipment according to the calculation result, checking the current site bearing capacity according to the weight of the hoisting equipment in full-load operation after the type selection in combination with the geological structure parameters collected in the step S1, and designing and reinforcing the construction operation bearing capacity according to the calculation result;
s3, transporting and erecting the beam slab, and after the construction of the step S2 is completed, using a transportation vehicle according to the 4 th#、3#、1#、2#Respectively transporting the beam slabs onto the existing bridge deck, wherein the pair 4 is performed#、3#、1#、2#In the process of transporting the beam plates, after the erection of the front-stage beam plate is finished, the rear-stage beam plate is transported to the bridge floor of the existing bridge, and the rest is done until all the beam plates are erected; in addition, in the pair 4#、3#、1#、2#In the girder erection work, the hoisting equipment determined in step S2 is sequentially operated from the center line to the edge of the bridge 4#Boundary beam plate, 3#Hoisting and constructing the middle beam and the beam plate, positioning the middle beam and the beam plate on the bridge pier of the new bridge to be widened, and then placing the middle beam and the beam plate 1 on the bridge deck of the bridge to be widened#The boundary beam and the beam plate are hoisted to a construction access road outside the bridge pier of the new bridge to be widened and are temporarily stored, and then hoisting equipment is used for hoisting the bridge deck 2 of the bridge to be widened#The middle beam plate is hoisted and positioned on a new bridge pier of a widened construction operation surface, and finally 1 positioned on the construction pavement is hoisted through hoisting equipment#And the edge beam slab is hoisted and positioned on the new bridge pier of the widened construction working face, so that the hoisting operation of the widened new bridge slab is completed.
In the step S2, when the bearing capacity of the site foundation is reinforced, the width of the construction pavement and the width of the isolation strip between the pier and the surrounding building are not less than 50 cm.
In the step S3, the key point is that in pair 4#Boundary beam plate, 3#Center sill plate, 2#Center sill plate and 1#When the boundary beam and beam slab is transported and temporarily stored, two sleepers are laid side by side at a position 1.5-2.5 m away from the end of the beam slab below the bottom plate of each beam slab, the sleepers and the beam slab are vertically arranged, the length of each sleeper is 1.5-2 times of the width of the bottom plate of each beam slab, two sides of two ends of each beam slab are symmetrically supported at the joint of the top plate and the web plate of each beam slab by adopting logs respectively, and the logs and the horizontal plane form an included angle of 50-70 degrees.
Preferably, in step S3, 4#Beam slab, 3#Beam slab, 2#Beam slab and 1#In the hoisting process of the beam slab, 4#Beam slab, 3#Beam slab, 2#Beam slab and 1#The beam slab bottom plate is 30-50cm higher than the construction working face.
Further optimally, in the step S3, the actual hoisting load of the hoisting equipment is 75% -80% of the rated hoisting load; the extending length of the suspension arm in the suspension arm hoisting operation is 70-80% of the maximum extending amount of the suspension arm of the hoisting equipment, and the included angle between the steel wire rope and the horizontal plane is not more than 50 degrees.
Preferably, in the step S3, the axes of the erected beam slabs to be hoisted are all distributed in parallel to the axis of the bridge, and the transportation vehicle before erection is as close as possible to the side of the guardrail of the existing bridge to be installed outside without affecting the hoisting operation.
As shown in fig. 3 and 4, the following describes the specific construction method of the invention with the specific embodiment of reconstruction engineering of the overpass crossing the jing broad-way on the provincial road 104 zheng line:
s1, acquiring field environment data, wherein the project is spanned on a Beijing Guangdong railway overpass, the distance between a new bridge and an old bridge is 30cm, the structural form is completely the same, the project is adjacent to a Zhan town in Wu\38495 county, the surrounding factories and residents are more, fish ponds, rice fields and ditches are densely distributed, the annual rainwater on the construction working surface is more, the floor area of a beam slab prefabricating and beam storage field is limited due to the field limit, only 9 beam slab prefabricating pedestals and one beam storage field are arranged, the maximum storage amount of the beam storage field is 12 beam slabs, the prefabricating field and the beam storage field are basically saturated, the whole schedule of the bridge project is influenced, meanwhile, because lead construction is not completed, a bridge erecting machine cannot enter the field for assembly, the beam slab spanned on the Beijing Guangdong railway main span must be erected by using a bridge erecting machine for safety consideration, so various factors are synthesized, the construction scheme adopts a large-tonnage truck to finish the erection of a united beam slab as a platform, the old bridge is utilized to hoist the bridge girder erection machine assembly on the platform for assembling the bridge girder erection machine, and then the bridge girder erection machine is utilized to complete the installation work of other two-connection beam plate supports to become a preferred scheme, and simultaneously 4#Boundary beam plate, 3#Center sill plate, 2#Center sill plate and 1#The dead weight of the boundary beam and the beam plate is respectively as follows:
the height difference between the original ground and the top surfaces of the new and old bridges is as follows:
s2, checking the computer device type selection, according to the data from the step S1, firstly according to 4#Beam slab, 3#Beam slab, 2#Beam slab and 1#The dead weight of the beam slab is considered according to the most unfavorable working condition of the maximum load, the load is 1702kN, and therefore a QAY350-350 tons truck crane is adopted as construction hoisting equipment; according to the height difference between the original ground and the top surface of the new bridge and the old bridge, the tenth span is the largest in vertical height of hoisting, and 9 th span of the tenth span#The pier is the highest in height difference, but the tenth span is at 9 in the hoisting process#The truck crane lifted at the pier should stand at the ninth span close to 9#At the bridge pier, the ninth span is not erected, so that the suspension arm of the bridge crane is slightly interfered by the erected beam plate and is positioned at the tenth span close to 10#The truck crane at the pier is in the most unfavorable working condition when the third beam plate and the fourth beam plate are erected, and meanwhile, the maximum working radius of the truck crane can not be larger than 12 meters to meet the load requirements of two 350T truck crane hoisting beam plates by combining the QAY350-350 ton truck crane main arm performance table data, and then a cross section diagram of the truck crane operation construction working condition position is carried out according to the most unfavorable construction condition:
wherein:
cargo boom expansion length during AB-truck crane hoisting
CD-height difference from original ground to top of middle beam-2 m (height from automobile crane boom to original ground)
BE-height difference from boom to original place when lifting the upper beam plate of gun carrier-2 m (height from truck crane boom to original ground)
Calculating the working length of the suspension arm under the worst working condition:
obtaining CD (compact disc) 10.58-2-8.58 m from height difference data of the original ground and the top surfaces of the new bridge and the old bridge;
DE is the horizontal distance from the new bridge span to the lifting point of the upper beam plate of the gun carriage of the old bridge, about 8.3 m;
from the performance data of the main arm of the truck crane of 350-350 tons in QAY, if the capacity of the double-beam-lifting plate of the truck crane is met, the working radius of the truck crane of 350 tons is not more than 12m under the worst working condition, namely the AE horizontal distance is not more than 12 m;
thus obtaining AD-DE-3.7 m;
AD/CD ═ AE/BE; i.e. 3.7/8.58-12/BE
BE is approximately equal to 27.827 m;
AB2＝AE2+BE2
AB≈30.3m＜31m
the working parameters of hoisting under the most unfavorable working condition of the middle-Union QAY 350-ton truck crane are met, and due to the fact that the abundance coefficient is not large, operation must be conducted strictly according to a hoisting construction scheme and an operation rule in construction.
In summary, the preliminary plan is to select 2 350T middle-link QAY 350-350T full hydraulic automobile cranes to hoist in a double-lifting mode. The extension length of one arm is controlled to be not more than 31m, the working radius is not more than 12m, and the single machine lifting capacity is not less than 90 t; the extension length of the other arm is controlled to be not more than 26m, the working radius is controlled to be not more than 8m, and the single machine lifting capacity is not less than 126 t;
selecting a steel wire rope:
2 steel wire ropes are adopted to lift in a binding mode in the process of hoisting the prestressed beam slab, two steel wire ropes are bound and hoisted near the beam end of each beam, the included angle between each steel wire rope and the horizontal plane is about 45 degrees, four steel wire ropes are arranged at two hoisting points, the stress n is equal to 4, and the self weight of each side beam is 1702 kN.
Steel wire rope internal force T-N/N (1/Sina) -1702 kN/4(1/0.707) -301 kN
Selecting a steel wire rope with the nominal tensile strength of 1870Mpa, considering the safety factor of the cross-iron project according to 10, and then 10 × 301 × 1000/1870 ═ 1610mm2
The tensile strength of the steel wire rope is 1870Mpa (N/mm)2) The specification of the steel wire rope is 6 multiplied by 37S +1, the diameter of the rope is phi 52cm, a new steel wire rope is used as a sling to hoist, and the total cross-sectional area of the steel wire of a single steel wire rope is 1855mm2＞1610mm2And the requirements are met.
Checking and calculating the hoisting load of the crane:
and the crane hoisting load checking calculation takes 170.2t of hoisting load as the basis for checking calculation of the crane, the lifting appliance machinery and equipment. Calculating the total lifting gravity load (G) of the 2 350T cranes by adopting double-crane lifting operation;
lifting gravity FB of each beam plate (tonnage calculated according to lifting design of prestressed boundary beam)
FB＝G×K×S+Q＝170.2×1.2×1.5+0.6＝306.96t
The weight of the double-crane combined crane is as follows:
(G main + G sub) × Z × COS β ═ 350t +350t × 0.8 × 0.707 ═ 395.92t
And obtaining (G main + G auxiliary) multiplied by Z multiplied by COS beta (395.92 t) and FB (306.96 t), wherein the gravity requirement of beam slab hoisting is met.
In the formula, G is mainly a theoretical hoisting weight value of the 300T crane;
g, the first pair is a theoretical hoisting weight value of the 300T crane;
z-is the reduction coefficient of the hoisting gravity of the crane, and is generally 0.8;
β is the angle of elevation of the boom, i.e. the angle of the longitudinal axis of the boom to the horizontal, here taken to be 45. (ii) a
K — dynamic load factor, typically 1.113, where K1 is 1.2;
g is the dead weight of the boundary beam, and G is 170.2 tons;
q is the weight of the crane hook and rigging, Q is 0.6 ton;
s-safety factor of the self weight of the beam slab, wherein 1.5 is taken.
Checking and calculating the bearing capacity of the foundation:
the most unfavorable condition when the truck crane works is that the 3 points touch the ground, that is, 3 legs support the weight (including dead weight and load) of the whole crane, namely:
maximum supporting force of single leg (G + Q)/3 ═ 191+350)/3 ═ 180.3t
In the formula, G is the self weight of the truck crane, and the 350t of crane is checked and calculated to be 191t, wherein the weight is 107 t.
Q-maximum load (rated load) of the truck crane, which is 350t, and the pressure of the truck crane to the ground is as follows:
pressure of single leg 780.3t/0.8m2＝225.42kPa
Wherein, the contact area of the S leg is 0.8m for the lower bolster2Meter, therefore, 350t truck-crane working time base bearingThe force requirement is not less than 225.42kPa, and the design requirement of the bearing capacity of the treated roadbed foundation is not less than 300kPa, so that the hoisting requirement is met.
The beam slab hoisting method comprises the following steps:
the beam slab hoisting is erected by two middle-connected QAYs 350-350 tons of full hydraulic truck cranes in a double-lift mode. The beam slab prefabricating and storing yard is close to the 1 st span to the 5 th span south side of a newly-built bridge, if the 1 st span to the 4 th span of the first connection is erected firstly, the beam slab prefabricating and erecting installation operation is carried out in the same site, the cross construction reduces the work efficiency and has great potential safety hazards, and therefore the erecting operation is arranged at the 10 th span to the 13 th span of the third connection firstly.
S3, transporting the beam slab, and after the construction of the step S2 is completed, using a transport vehicle (beam transporting gun carriage) according to the 4 th#、3#、1#、2#The beam plates are respectively transported to the bridge floor of the existing bridge in sequence, the next beam plate is arranged to be transported after one beam plate is erected, and the like; the beam plates to be hoisted are distributed in parallel with the axis of the bridge, and the front beam transporting gun carriage is erected to be as close to the guardrail of the existing bridge to be installed outside the span on the premise of not influencing the hoisting operation;
firstly, the 13 th span 4 is spanned by a gantry crane#The side span sideboard beam plates are placed on the beam transport gun trucks, the beam transport gun trucks are instructed to drive along the construction temporary roads in the reverse bridge direction, the construction temporary roads and old bridge leads are at the same height and drive into the existing roads, traffic is controlled when the gun trucks drive into the trunk roads, and road administration management personnel dredge vehicles, especially heavy-load vehicles, which drive into the existing bridges on two sides of the existing bridges. The gun carriage is turned around and drives to the existing old bridge, and the speed of the gun carriage is strictly controlled. A full-time vehicle is arranged in front of the gun carriage for guiding, a full-time director holds a red flag to warn opposite coming vehicles in front, and vehicles and a safety guard are arranged behind the gun carriage to warn rear vehicles. When the gun carriage is about to pass through the main span above the business line of the Jingguang railway of the old bridge, whether a train passes or not is observed, the speed of the gun carriage is controlled to pass through at a constant speed when no train passes below the main span and no heavy-load vehicle on the bridge simultaneously drives into the main span, and the gun carriage stops close to the inner side of a guardrail on one side of a new bridge when driving into the third 13 th span of the old bridge. Because the new bridge and the lead are widened items, the bridge lead construction is convenientThe method is carried out by using the existing road, and no temporary access is built outside the roadbed. The paddy field is arranged on the outer side of the roadbed, if a beam transporting channel is built, the distance is long, and the distance reaches more than three hundred meters, special treatment needs to be carried out on the paddy field, so that the investment is huge, and the time is not allowed. The existing rural road of the underpass overpass is 5 meters wide, hoisting equipment and other necessary materials can be transported to the underbridge by utilizing the rural road, and a truck crane and a flat car for transporting a counterweight can also reach a hoisting site by utilizing the rural road, but because the turning radius is not enough, a beam plate with the length of 40m, the width of 2.85m and the height of 2.2m cannot reach a construction site by utilizing the rural road, so that the beam plate cannot be hoisted by adopting a conventional mode, the technical difficulty and risk of hoisting are increased, a safe and reliable alternative scheme must be found, and the technical measures of the alternative scheme are proper and dense, have strong operability and are convenient for construction. Finally, the old bridge is determined to be used for erecting the beam slab through scheme selection;
meanwhile, when the beam plate is hoisted and erected, a constructor uses the steel wire rope to bind the beam plate. Two 350t truck cranes are respectively in place, one stands at the inner side of the bridge abutment and close to the bridge abutment, and the other stands at 12#Inner side of the bridge pier is close to 12#And (5) at the bridge pier. And after the truck crane hook is hung on the steel wire rope of the binding beam plate and is completely stressed, the traffic on the bridge is completely closed.
Hoisting begins, the two truck cranes are uniformly commanded by the main command of the girder erection to hoist, the steel wire ropes are tightened, the beam slab is hoisted to be 200 mm away from the girder transporting gun carriage and then is stopped for 2 minutes, whether the hoist and the hoist rigging are intact and stable is checked, the hoist is slowly hooked after no abnormal condition exists, the beam slab is moved to the direction of a new bridge after being 30-50cm higher than the guardrail of the old bridge, and the beam slab is slowly rotated to 4 degrees#The boundary beam plate is hung to 13#4, the position is adjusted, and the robot slowly descends to place the robot at 13#4, temporary supports are arranged on the beam pier, and the supports at two ends of the beam are aligned when the supports are in place, and the central lines of the beam and the beam pier coincide. And releasing the lifting hook to release the steel wire rope after the beam slab is temporarily supported. During hoisting, the strength of the suspension arm is paid great attention, the length of the boom must be controlled according to a scheme established by construction organization design and the specification of a use specification, and the suspension arm cannot be extended blindly so as to avoid the occurrence of boom foldingAnd an accident is caused. And (4) checking whether the length of the steel wire rope is enough or not, wherein the multiplying power of the steel wire rope and the pulley block must meet the use requirement of the hoisting operation.
Moving the machine after the first beam plate is installed and carrying out 3#And (5) hoisting the middle beam plate. After the first beam plate is installed, the horizontal distance between the truck crane and the beam plate to be hoisted is increased, the vertical hoisting height is increased, the hoisting difficulty is increased, the operation work of the crane is further controlled on the basis of repeating the hoisting procedure of the first beam plate, and 3#The middle beam plate is stably placed on the temporary support. When the beam is installed, gaps between the beam plate and the beam plate should be controlled uniformly. The beam plate is not loosened after being installed, and no gap is reserved between the beam plate and the temporary support.
The hoisting of the third beam plate and the fourth beam plate is difficult in construction. According to a normal hoisting sequence, the middle-connection QAY350-350 tons of full hydraulic automobiles can finish the hoisting work of the third middle beam plate under the most unfavorable working condition, and the hoisting of the fourth side beam plate becomes a dead knot of construction.
Through the comparison of the schemes, the left side 1 is firstly determined to be hoisted from the old bridge by adopting the truck crane#The side span side beam is temporarily placed, and then the truck crane is provided with another sheet 2 under the condition of not moving the crane#The side spans the centre sill. The position for temporarily placing the beam plate has two schemes, one is to arrange the edge 1#The edge spanning beam is temporarily placed on the 4 hoisted in place#Adopting a temporary supporting method above the side span boundary beam; the second scheme is that 1#And directly hoisting the side span boundary beam to the underpass of the bridge for temporary support. Because the first scheme greatly increases the load on one side of the bridge and has certain potential safety hazard under the condition that the front two beam plates are in temporary support and are not connected into a whole, the second scheme is adopted to combine the beam plates 1#And (4) temporarily hoisting the side span boundary beam to a sleeper placed in the temporary access way, supporting the beam plate by using a log, and removing the lifting hook after the support is stable. The truck crane repeatedly operates without moving the crane to place another side span centre sill 2#And the beam plate temporary support.
The last beam plate is hoisted by placing the temporary placed side span boundary beam on the sidewalk at 1#In position. Mobile truck is hung toAt the outer side of the bridge span, a lifting hook is used for hanging the steel wire rope bound on the beam slab, the beam slab is lifted to 300mm away from the ground and then is stopped, the parking is carried out for 2 minutes, whether a crane and a crane rigging are intact and stable is checked, the crane is lifted up slowly after no abnormal condition exists, and the side span is lifted to 13 by slowly rotating to lift the side beam of the side span#Position 1, after the orientation is adjusted, slowly descending to place the device in position 1#A temporary support.
11 th span beam plate installation
The erection of 4 beam plates of the 12 th span is completed according to the installation mode of the 13 th span, but a new problem is encountered in the installation process of the 11 th span beam plate. An irrigation ditch penetrates through the 11 th span of the bridge in an inverted siphon mode, a vertical shaft on one side of the inverted siphon is positioned on an access way on one side of the widened bridge, and the ditch is about 60cm higher than the access way. Due to obstruction of trenches, 1#The mid-span boundary beam cannot be temporarily placed on the ground, and the irrigation of nearby farmlands is affected if the ditch is removed. Checking and calculating to determine that one side of the ditch is stacked by using sleepers according to the shape of the Chinese character jing, wherein each layer comprises four layers; the other end of the flat car uses a plate car for transporting the balance weight of the crane as a fulcrum, a sleeper is stably placed on the flat car, the fulcrums at the two sides are positioned on the same horizontal plane, and then the step 1 is carried out#The mid-span boundary beam is temporarily placed and necessary protective measures are adopted, and 2 is completed#After the mid-span middle beam is installed, the steel plate 1 is installed in time#And (5) installing the mid-span boundary beam in place to finish the hoisting operation.
The invention can effectively reduce the occupied area of the construction working surface and the auxiliary facilities during the bridge widening construction, thereby effectively reducing the bridge widening construction cost and the damage and the influence on the surrounding environment, effectively improving the construction efficiency and the construction quality, and effectively meeting the requirements of the bridge widening construction operation under various complex construction conditions.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A method for installing a narrow space beam slab of a widening project of a long-span overpass is characterized by comprising the following steps of: the method for mounting the beam plate of the large-span overline bridge widening project under the condition of limited operation site comprises the following steps:
s1, acquiring field environment data, firstly carrying out data mapping and acquisition on the height and the width of a bridge to be widened in a construction field according to construction requirements, then carrying out data mapping and acquisition on the area of a widened construction working face, the working height, the width of a construction access way, a geological structure and structural characteristics of a beam plate to be constructed, numbering the beam plate to be widened from the middle line to the edge position of the bridge according to the positioning position of the beam plate to be installed as a No. 4 boundary beam plate, a No. 3 middle beam plate, a No. 2 middle beam plate and a No. 1 boundary beam plate in sequence, and finally summarizing all data for later use;
s2, checking the type selection of computer equipment, according to the data collected in the step S1, firstly, calculating the lifting load, the length of a suspension arm and the structural strength of a lifting steel wire rope of lifting equipment required in the lifting operation according to the weight and the lifting operation span of a 4# beam plate, a 3# beam plate, a 2# beam plate and a 1# beam plate, carrying out the type selection of the lifting equipment according to the calculation result, then, according to the weight of the lifting equipment in full-load operation after the type selection, checking the current site bearing capacity by combining the geological structure parameters collected in the step S1, and designing and reinforcing the construction operation bearing capacity according to the calculation result;
s3, transporting and erecting the beam plates, after the construction of the S2 step is completed, transporting the beam plates to the existing bridge deck by using a transport vehicle according to the sequence of 4#, 3#, 1# and 2#, wherein in the transporting process of the 4#, 3#, 1# and 2# beam plates, after the previous beam plate is erected, the next beam plate is transported to the existing bridge deck, and so on until all the beam plates are erected; in addition, in the erection operation of the 4#, 3#, 1#, and 2# beam plates, firstly, the hoisting equipment determined according to the step S2 sequentially carries out the hoisting construction operation of the 4# side beam plate and the 3# middle beam plate from the middle line to the edge position of the bridge and positions the side beam plates on the bridge deck to be widened on the widened new bridge pier, then the 1# side beam plate on the bridge deck to be widened is hoisted on the construction temporary road outside the widened new bridge pier and temporarily stored, then the hoisting equipment hoists and positions the 2# middle beam plate on the bridge deck to be widened on the new bridge pier of the widened construction working face, and finally the hoisting equipment hoists and positions the 1# side beam plate on the construction temporary road on the new bridge pier of the widened construction working face, thereby completing the hoisting operation of the widened new bridge plate.
2. The method for installing the narrow space beam slab of the widening project of the long-span bridge according to claim 1, is characterized in that: in the step S2, when the bearing capacity of the site foundation is reinforced, an isolation strip having a width of not less than 50cm is additionally provided between the construction pavement width and the bridge pier and the surrounding building.
3. The method for installing the narrow space beam slab of the widening project of the long-span bridge according to claim 1, is characterized in that: in the step S3, when transporting and temporarily storing the No. 4 boundary beam plate, the No. 3 middle beam plate, the No. 2 middle beam plate and the No. 1 boundary beam plate, two sleepers are paved side by side at a position 1.5-2.5 m away from the end of the beam plate below the bottom plate of each beam plate, the sleepers and the beam plates are vertically arranged, the length of each sleeper is 1.5-2 times of the width of the bottom plate of the beam plate, two sides of two ends of each beam plate are symmetrically supported at the joint of the top plate and the web plate of the beam plate by using logs, and the included angle between each log and the horizontal plane is 50-70 degrees.
4. The method for installing the narrow space beam slab of the widening project of the long-span bridge according to claim 1, is characterized in that: in the step of S3, the bottom plates of the 4# beam plate, the 3# beam plate, the 2# beam plate and the 1# beam plate are higher than the construction working face by 30-50cm in the hoisting process of the 4# beam plate, the 3# beam plate, the 2# beam plate and the 1# beam plate.
5. The method for installing the narrow space beam slab of the widening project of the long-span bridge according to claim 1, is characterized in that: in the step S3, the actual hoisting load of the hoisting equipment is 75% -80% of the rated hoisting load; the extending length of the suspension arm in the suspension arm hoisting operation is 70-80% of the maximum extending amount of the suspension arm of the hoisting equipment, and the included angle between the steel wire rope and the horizontal plane is not more than 50 degrees.
6. The method for installing the narrow space beam slab of the widening project of the long-span bridge according to claim 1, is characterized in that: in the step S3, the axes of the erected beam slabs to be hoisted are all distributed in parallel with the axis of the bridge, and the transportation vehicle before erection is as close as possible to one side of the guardrail of the existing bridge to be installed and spanning the outer side on the premise of not affecting the hoisting operation.
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