CN110820608A - Existing railway passenger station-entering overbridge dismantling method - Google Patents
Existing railway passenger station-entering overbridge dismantling method Download PDFInfo
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- CN110820608A CN110820608A CN201911308089.7A CN201911308089A CN110820608A CN 110820608 A CN110820608 A CN 110820608A CN 201911308089 A CN201911308089 A CN 201911308089A CN 110820608 A CN110820608 A CN 110820608A
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- overpass
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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
Abstract
The invention discloses a method for dismantling an existing railway passenger station-entering overpass, which comprises the following steps of firstly fixing a canopy cornice close to a line side below the station-entering overpass and cutting the canopy cornice by a wire saw; contact net protection sheds are erected outside two sides of the side wall of the station-entering overpass; cutting the cornice on the top of the platform bridge by using a wire saw; dismantling a top plate (comprising a cross beam and a longitudinal beam) of the platform bridge; horizontally cutting frames on two sides of the root of the platform bridge upright post and the upper part of the platform bottom plate by using a wire saw and hoisting the frames to a safe position; dismantling a canopy cornice on the side of the platform far away from the line, and erecting a temporary support in a point; dismantling two support columns outside the platform bridge bottom plate, then cutting off the power of a contact network, sequentially cutting the longitudinal beam and the inner support column in sections from the north and south sides, and lifting and moving the longitudinal beam and the inner support column outside a limit to be crushed; and then the temporary support is removed to finish the removal of the station overpass between the two stations. The method has the advantages of more scientific and safe dismantling method, short time and minimum influence on the existing railway train.
Description
Technical Field
The invention relates to demolition construction of a reinforced concrete structure spanning an existing railway, in particular to a demolition method of an overpass for passengers to enter a station.
Background
In order to meet the requirement of high-speed development of modern railways, old urban railway station foundation buildings need to be dismantled, rebuilt, expanded, upgraded and modified.
When the existing reinforced concrete structure is dismantled, the main methods comprise manual chiseling by using an air pick, cutting by using a saw blade, blasting and disintegrating, crushing by using a crushing head, cutting by using a large-scale cutting machine and the like. However, if the reinforced concrete structure to be dismantled is crossed over the existing busy trunk line, the conventional dismantling method is affected by various factors such as passing of trains and stop.
The existing line structure-crossing demolishing construction must report a construction plan to a railway bureau, and can be operated after the line is blocked, and according to the technical rules of the railway bureau, the construction of the hanging beam crossing a busy trunk line belongs to a II-level point within 120 minutes, and belongs to an I-level point after more than 120 minutes, and the construction is not repeated, so that the demolition method which has short construction time and safe protection is very necessary to find because the construction can not be carried out according to the conventional construction method.
Disclosure of Invention
The invention aims to provide a safe and reliable method for dismantling an overpass for the arrival of the existing railway passengers, aiming at the defects of the existing construction method.
In order to achieve the purpose, the invention can adopt the following technical scheme:
the method for dismantling the overpass for the existing railway passenger to approach the station comprises the following steps:
firstly, fixing a canopy cornice close to a line side below an approach overpass by adopting suspension equipment, and then cutting by using a rope saw in a stressed state; the cut canopy cornices are transported to a safe place by a crane and then crushed;
secondly, erecting contact net protection sheds outside two sides of the side wall of the station-entering overpass;
thirdly, cutting the cornice on the top of the platform bridge by using a rope saw under the condition that the crane is stressed according to the method in the first step; the cut top cornices are transported to a safe place by a crane and then crushed;
fourthly, breaking the slab concrete in the beam of the top plate of the station-entering overpass and reserving the steel bars in the slab; the crane is stressed, and after the steel bars in the plate body of the roof plate of the overpass are burnt off by electric welding, the steel bars of the roof plate and the cross beam are lifted away together;
fifthly, cutting downwards from the top of the longitudinal beam of the top plate of the overpass by adopting a wire saw, and hanging the longitudinal beam of the top plate of the overpass in sections;
sixthly, the crane lifts the upper part of the overpass upright post, the rope saw is adopted to horizontally cut the root part of the overpass upright post after the crane is stressed, and the cut overpass upright post is lifted to a safe position;
seventhly, horizontally cutting the frames on the two sides of the upper part of the platform bottom plate by using a wire saw and hoisting the frames to a safe position;
eighthly, dismantling the canopy cornice on the side of the platform far away from the line, and erecting a temporary support in a spot;
ninthly, dismantling two support columns outside the platform bridge bottom plate, then cutting off the power of a contact network, putting a crane in place, sequentially cutting the longitudinal beams and the inner support columns in sections from the south and north sides, and lifting and moving the longitudinal beams and the inner support columns to the outside of a limit for crushing; then the temporary support is removed to complete the removal of the station overpass between the two stations;
and (4) finishing the dismantling of the station overpasses among the rest platforms according to the method.
And the support upright posts in the passenger station overpass step and later platform range are manually dismantled by adopting crushing heads.
The method has the advantages of more scientific and safe dismantling method, short time and minimum influence on the existing railway train. Specifically, the method comprises the following steps:
for the overhanging high-altitude operation, because the cutting surface is provided with vertical and horizontal cutting seams and the cutting seams are narrow in position, the cutting and fixing are difficult by using the saw blade, the safety risk is high, the wire saw is adopted for cutting (comprising an overhanging eave, an upper longitudinal beam, an upright post, a canopy overhanging eave and the like), the cutting surface is flat, and the integral hoisting is convenient;
the crushing head is utilized to dismantle the platform range overpass upright post in the later stage of the platform range overpass treadmill, the efficiency is fast, the cost is low on the premise of ensuring that the railway clearance is not invaded and the driving safety is not endangered, and the large reinforced concrete blocks dismantled in the site can be crushed in the same day;
during cutting the cornice by the rope saw, chiseling off concrete around the top plate by using a manual hand-held pneumatic pick, reserving reinforcing steel bars, burning off the reinforcing steel bars by using electric welding at the next point, hanging off the top plate, and dropping welding slag into an inner frame of the overpass when welding rods are burned off, so that the method is safe and feasible;
the brick masonry on the side wall of the frame is dismantled manually by using a sledge hammer, so that the operation is convenient, and the safety of the existing equipment can be ensured;
the crane can be moved after the power failure of the contact network, personnel can get on the platform bridge, the crane must be folded and fixed before the power transmission of the contact network, and the personnel must go down to the platform bridge, so that the safety of the dismantling work is ensured.
Drawings
Fig. 1 is a schematic structural view of a docking station to be dismantled.
Fig. 2 is a block diagram of the deck of the overpass of fig. 1.
Fig. 3 and 4 are schematic diagrams after installation of the overhead line system protection canopy frame.
Fig. 5 is a structural view of the ceiling plate of the overpass of fig. 3.
Fig. 6 is a schematic view of the overpass floor 3 with its upper member removed.
Detailed Description
The method of the invention is explained in more detail below by taking the example of dismantling the platform bridge of the two-platform and three-platform trans-focal willow line railway trunk line passenger station in the train station in south-China city in Henan province.
When the station-entering overbridge is dismantled, the limitation that the passing and stopping of trains are more and the construction operation can not be carried out when the train passes through the station-entering overbridge at a high speed is required besides the existing busy trunk line of the upper span.
As shown in fig. 1, 3 rails (i.e., iii, i, ii) are arranged between the base platform and the second platform, 2 rails (i.e., iv, vi) are arranged between the second platform and the third platform, 42 times of train passing and 23 times of train stopping are averagely performed in 6:30 to 18:30 periods each day.
The specific dismantling method for the passenger station-entering overbridge with the two or three platforms comprises the following steps:
firstly, dismantling the canopy cornice 1 between the second and third stations
Drilling a small hole of 3cm at a position, close to the support upright post 2, on the canopy cornice 1 to be dismantled, penetrating a diamond wire of a concrete wire saw machine into the small hole, and fixing a wire saw main machine on a platform at the outer side below the small hole; the electric hoist is hung on a longitudinal beam 3.1 of an overbridge bottom plate 3 to fix a canopy cornice 1 (as shown in figure 2), and a rope sawing machine starts to work under the stress state of the electric hoist to cut the canopy cornice 1 (along a supporting upright post 2). After cutting, slowly dropping the canopy cornice 1 onto a platform (a position which is not influenced by a wire saw host) by using an electric hoist, hanging the cut canopy cornice 1 out of the limit of three platforms by using a 70t crane, and crushing the reinforced concrete cornice block outside a crushing head, wherein the situation after the work is finished is shown in fig. 3;
secondly, installing a contact net protection shed frame
Because the distance between the contact net and the overpass bottom plate is only 0.5m, in order to prevent the upper object from falling during construction, four openings (two openings are formed in the side wall on one side) are formed in the side walls 4 on two sides of the existing overpass, two sections of steel rails 5 with the length of 3m are used as transverse supports of a protective shed frame, the two sections of steel rails 5 are connected by using clamping plates, expansion screws are arranged on the overpass bottom plate 3 and are fixed by using clamping rings, a bamboo ladder is laid on the overhanging steel rails 5, a template 6 is laid on the bamboo ladder to protect the contact net on the IV road and the VI 6 road, as shown in figures 3 and 4 (figure 4 is a cross section view from figure 3A-A); for safety, bamboo guard rails can be arranged on the outer sides, and protective nets are hung on the bamboo guard rails;
thirdly, dismantling the cornice 7 and the side wall 4 at the top of the platform bridge
Determining the length of the cornice 7 cut each time according to the hoisting weight of a crane, and drawing cutting lines and hoisting holes, wherein each block needs two hoisting holes; two hoisting holes with the diameter of 10cm are drilled by a water drill, and the bottom of the steel wire rope pocket is hoisted by a 70t crane to bear force. And a sledge hammer is used for chiseling two holes at the cutting line for penetrating a diamond rope, and the rope saw host machine is fixed on an overbridge top plate 8 on the inner side of the cornice 7. Under the condition that the crane is stressed, the rope saw transversely cuts two cutters, longitudinally cuts one cutter and cuts off the cornice 7; the cutting cornice 7 is lifted to the outside of the limit of the three platforms by a crane, and the reinforced concrete blocks are crushed by the crushing heads;
dismantling the brick masonry of the side wall 4 by a sledge hammer in the spot, and manually transporting the dismantled building blocks to the overpass frame in a three-station range; hanging a safety belt in the dismantling process, and erecting a 1.2m near-edge protective rail after dismantling;
fourthly, the top plate 8 of the platform bridge of the station is dismantled
As shown in fig. 5, the concrete in the upper beam 8.1 of the platform bridge top plate 8 is broken by using an air pick, and the steel bars in the plate body are reserved to prepare for next step of dismantling the platform bridge top plate 8;
the steel bar gap after the concrete is chiseled off is utilized to pocket the bottom of the steel wire rope, and the crane is lifted to bear force; utilizing electric welding to burn off the steel bars in the plate body, and hanging the plate body with the cross beam away one by a crane; note that each hoisting comprises a top plate and a cross beam 8.1;
fifthly, removing the longitudinal beam 8.2 of the platform bridge top plate 8
Fixing a rope saw host on an overpass bottom plate 3, lapping a diamond rope on a longitudinal beam 8.2 of an overpass top plate 8, cutting downwards, adopting an oblique notch on site, wherein the upper surface of the oblique notch is close to the outside, the lower surface of the oblique notch is close to the inside, and the oblique notch is inverted trapezoidal, and then hanging the cut longitudinal beam 8.2 section by section to a safe area for crushing;
sixthly, dismantling the overpass upright post 9
The T-shaped position at the upper part of the overpass upright post 9 is hung by a steel wire rope, the crane is stressed, the rope saw host is fixed on the root part of the overpass upright post 9 to horizontally cut the overpass upright post, then the crane is used for hanging the cut overpass upright post 9 outside the safety limit under the bridge, and all the overpass upright posts 9 are completely disassembled according to the method.
Seventhly, dismantling the upper frame of the platform overpass bottom plate 3
Because the overpass top plate 8 and the overpass upright post 9 are completely removed, the two rest portal frames on the two sides can be integrally cut and hoisted after the weight is calculated, and then the frames on the two sides of the platform are horizontally cut by a wire saw and hoisted to a safe position;
step eight, setting up the support 10 and removing the cornice 11 of the canopy outside the platform
In order to prevent the platform overpass bottom plate frame from overturning due to unbalance loading when the longitudinal beam 3.1 is removed due to unbalance loading of the canopy, firstly removing the canopy cornices 11 on the outer side of the platform (the cornices on the two platforms are removed as the inner side of the platform when the first platform and the second platform are removed), and internally setting the support 10, as shown in fig. 6, simultaneously entering the site by 300t of the crane.
Ninthly, integrally removing the bottom plate 3 of the overpass spanning the existing line
In order to ensure the safe hoisting of the longitudinal beams of the overpass bottom plate 3 at the overpass part, two sections of supporting upright columns 12 at the outer side (the right end part in fig. 5) of the overpass bottom plate 3 at the three stations need to be dismantled firstly; the key point of construction is 115 minutes, a 300t crane is in place after the power failure of a contact network, the longitudinal beam 3.1 and the internal support upright post 13 are cut in sections from the north side to the south side in sequence, the cutting of each upright post is controlled to be 8 minutes, the cutting of the longitudinal beam 3.1 is controlled to be 14 minutes each time, and the cut longitudinal beam sections and the support upright posts are hoisted to the outside of a limit and crushed; and after the platform bridge bottom plate 3 is completely disassembled, erecting a support 10 for dismantling, and transferring a crane to complete the dismantling of the passenger platform bridge between the second platform and the third platform.
And then the removal of the overbridge among the rest stations is completed according to the same removal method.
Claims (2)
1. A method for dismantling an overpass for the arrival of an existing railway passenger is characterized by comprising the following steps: the method comprises the following steps:
firstly, fixing a canopy cornice close to a line side below an approach overpass by adopting suspension equipment, and then cutting by using a rope saw in a stressed state; the cut canopy cornices are transported to a safe place by a crane and then crushed;
secondly, erecting contact net protection sheds outside two sides of the side wall of the station-entering overpass;
thirdly, cutting the cornice on the top of the platform bridge by using a rope saw under the condition that the crane is stressed according to the method in the first step; the cut top cornices are transported to a safe place by a crane and then crushed;
fourthly, breaking the slab concrete in the beam of the top plate of the station-entering overpass and reserving the steel bars in the slab; the crane is stressed, and after the steel bars in the plate body of the roof plate of the overpass are burnt off by electric welding, the steel bars of the roof plate and the cross beam are lifted away together;
fifthly, cutting downwards from the top of the longitudinal beam of the top plate of the overpass by adopting a wire saw, and hanging the longitudinal beam of the top plate of the overpass in sections;
sixthly, the crane lifts the upper part of the overpass upright post, the rope saw is adopted to horizontally cut the root part of the overpass upright post after the crane is stressed, and the cut overpass upright post is lifted to a safe position;
seventhly, horizontally cutting the frames on the two sides of the upper part of the platform bottom plate by using a wire saw and hoisting the frames to a safe position;
eighthly, dismantling the canopy cornice on the side of the platform far away from the line, and erecting a temporary support in a spot;
ninthly, dismantling two support columns outside the platform bridge bottom plate, then cutting off the power of a contact network, putting a crane in place, sequentially cutting the longitudinal beams and the inner support columns in sections from the south and north sides, and lifting and moving the longitudinal beams and the inner support columns to the outside of a limit for crushing; and then the temporary support is removed to finish the removal of the station overpass between the two stations.
2. The existing railway passenger inbound overpass demolition method of claim 1, wherein: and the support upright posts in the passenger station overpass step and later platform range are manually dismantled by adopting crushing heads.
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| CN201911308089.7A CN110820608A (en) | 2019-12-18 | 2019-12-18 | Existing railway passenger station-entering overbridge dismantling method |
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| CN201911308089.7A CN110820608A (en) | 2019-12-18 | 2019-12-18 | Existing railway passenger station-entering overbridge dismantling method |
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Cited By (5)
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| CN111996931A (en) * | 2020-07-25 | 2020-11-27 | 北京城乡建设集团有限责任公司 | Construction method for green demolition and transformation of existing bridge and sewage collection device thereof |
| CN112610023A (en) * | 2020-12-09 | 2021-04-06 | 中铁隆工程集团有限公司 | Construction method for dismantling building in existing track operation interval |
| CN112727147A (en) * | 2020-12-23 | 2021-04-30 | 浙江省一建建设集团有限公司 | Outdoor suspended step dismantling method |
| CN113106980A (en) * | 2021-03-16 | 2021-07-13 | 中煤江南建设发展集团有限公司 | Method for dismantling old beam plate in foundation pit supporting structure |
| CN114033204A (en) * | 2021-11-03 | 2022-02-11 | 中铁七局集团有限公司 | Reconstruction construction method for existing single-column canopy |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111996931A (en) * | 2020-07-25 | 2020-11-27 | 北京城乡建设集团有限责任公司 | Construction method for green demolition and transformation of existing bridge and sewage collection device thereof |
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| CN112727147A (en) * | 2020-12-23 | 2021-04-30 | 浙江省一建建设集团有限公司 | Outdoor suspended step dismantling method |
| CN113106980A (en) * | 2021-03-16 | 2021-07-13 | 中煤江南建设发展集团有限公司 | Method for dismantling old beam plate in foundation pit supporting structure |
| CN114033204A (en) * | 2021-11-03 | 2022-02-11 | 中铁七局集团有限公司 | Reconstruction construction method for existing single-column canopy |
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Application publication date: 20200221 |