CN113387277B - Railway shed tunnel T-shaped beam hoisting construction method - Google Patents
Railway shed tunnel T-shaped beam hoisting construction method Download PDFInfo
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- CN113387277B CN113387277B CN202110652708.5A CN202110652708A CN113387277B CN 113387277 B CN113387277 B CN 113387277B CN 202110652708 A CN202110652708 A CN 202110652708A CN 113387277 B CN113387277 B CN 113387277B
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- 238000010276 construction Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 210000001364 upper extremity Anatomy 0.000 claims description 4
- 239000011435 rock Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C19/00—Cranes comprising trolleys or crabs running on fixed or movable bridges or gantries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C5/00—Base supporting structures with legs
- B66C5/02—Fixed or travelling bridges or gantries, i.e. elongated structures of inverted L or of inverted U shape or tripods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C9/00—Travelling gear incorporated in or fitted to trolleys or cranes
- B66C9/14—Trolley or crane travel drives
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F7/00—Devices affording protection against snow, sand drifts, side-wind effects, snowslides, avalanches or falling rocks; Anti-dazzle arrangements ; Sight-screens for roads, e.g. to mask accident site
- E01F7/04—Devices affording protection against snowslides, avalanches or falling rocks, e.g. avalanche preventing structures, galleries
- E01F7/045—Devices specially adapted for protecting against falling rocks, e.g. galleries, nets, rock traps
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Abstract
The invention relates to a T-shaped beam hoisting construction method for a railway shed tunnel, and belongs to the technical field of railway anti-collapse equipment. The T-shaped beam is prefabricated in an off-site different place, a stand column and a longitudinal beam are installed in a foundation pit of an excavated shed tunnel, an existing railway track below the longitudinal beam is used, windlasses are respectively installed on the ground at the two ends of the longitudinal beam, a simple gantry crane with a plurality of telescopic supporting legs and a crane track formed by splicing a plurality of single tracks with unit length are erected on the longitudinal beam, the T-shaped beam is hoisted on a sliding plate by the gantry crane, the front and rear single tracks of the crane track are disassembled and spliced, the supporting legs are stretched, the gantry crane spans the T-shaped beam and the sliding plate one by one, and then the sliding plate and the T-shaped beam on the sliding plate are pulled to a design position with a gap on the longitudinal beam by the windlasses; and the crane rails and the support legs of the simple gantry crane are arranged at the top of the hoisted T-shaped beam, so that hoisting of all the T-shaped beams on the longitudinal beams is completed. The method can make the hoisting of the prefabricated T-shaped beam of the railway shed tunnel simpler and more convenient.
Description
Technical Field
The invention relates to a T-shaped beam hoisting construction method for a railway shed tunnel, and belongs to the technical field of railway anti-collapse equipment.
Background
In the railway construction process of the southwest mountain area, the railway inevitably meets the landform of rivers and mountains, and a large number of high slopes and cliffs are generated in the construction process. Along with the lapse of time, many side slope structure reinforcing measures built in early years gradually lose efficacy, slope rock mass weathering is increasingly serious, stability is poor, and under the action of external force such as rainfall, earthquake and the like, geological disasters such as landslide, falling rocks, debris flow and the like are easily induced, so that railway driving safety is influenced.
A protective shed tunnel is newly built on a railway business line, and is an effective measure for treating dangerous rock falling on the side uphill slope of the entrance and exit of the tunnel and the high cutting side slope. The shed tunnel construction comprises foundation excavation (upright column foundation and inner side wall foundation), prefabricated erection of upright columns, longitudinal beams, inner side wall concrete, T-shaped beams and the like. Because the position of additionally arranging the protective shed tunnel on the railway business line is often extremely unfavorable in construction condition, the construction site is narrow and dangerous suddenly, and the railway system of the established system forms an isolated and isolated environment for the construction site; therefore, the problems that the T-shaped beam is prefabricated without a field, the scaffold and the portal frame are difficult to install and the like are faced.
In the prior art, as disclosed in publication No.: chinese patent CN108589568, "a method for quickly constructing T-shaped beam of shed tunnel over business line in narrow space", describes a method for prefabricating T-shaped beam on the top of shed tunnel, which comprises the following steps: after the shed tunnel foundation and the upright post are poured, a bracket is embedded in the outer side of a shed tunnel longitudinal beam to serve as a gantry crane track platform; and laying a distribution beam and a template at the top of the shed tunnel to serve as a T-shaped beam prefabricating site, and meanwhile, laying the top of the installed T-shaped beam to serve as a prefabricating site, and repeating construction until the T-shaped beam prefabricating installation is completed. However, the technical scheme provides that the top of the shed tunnel is used as a T-shaped beam prefabricating field, and the outer side of a longitudinal beam of the shed tunnel is provided with the bracket for installing the gantry crane, so that the load design requirement on the upright column, the longitudinal beam and the bracket of the shed tunnel is higher, the load deflection generated by the gantry crane and the T-shaped beam hoisting can be resisted by reaching a certain thickness, and the field installation of the gantry crane and the field prefabrication and hoisting of the T-shaped beam are not easy to realize.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the construction of the T-shaped beam of the existing railway shed tunnel is improved, so that the T-shaped beam of the railway shed tunnel is easier and more convenient to hoist.
The technical scheme provided by the invention for solving the technical problems is as follows: the T-shaped beam hoisting construction method for the railway shed tunnel comprises the following steps of prefabricating the T-shaped beam in an off-site different place, installing a stand column and a longitudinal beam in an excavated foundation pit of the shed tunnel, and executing the following steps:
s1, respectively installing windlasses on the ground at the two ends of the longitudinal beam, and building a simple gantry crane and a crane rail on the longitudinal beam; the simple gantry crane is provided with a plurality of telescopic supporting legs; the multiple legs comprise four front legs and four rear legs which fall on the crane rail; the four front supporting legs are divided into two pairs which are opposite in parallel along the running direction of the longitudinal beam and respectively comprise a pair of front outer supporting legs and a pair of front inner supporting legs; the four rear supporting legs are divided into two pairs which are opposite in parallel along the running direction of the longitudinal beam and respectively comprise a pair of rear outer supporting legs and a pair of rear inner supporting legs; the crane rail is divided into a front section crane rail and a rear section crane rail, wherein the front section crane rail is used for placing the front four legs, and the rear section crane rail is used for placing the rear four legs;
s2, installing a rail flat car on the existing railway track, and transporting the T-shaped beam prefabricated at the different place to the bottom of the longitudinal beam by using the rail flat car;
s3, paving a first sliding plate on the longitudinal beam between the front-section crane rail and the rear-section crane rail, and hoisting a first T-shaped beam to the first sliding plate by using the simple gantry crane;
s4, intermittently moving the simple gantry crane forwards along the longitudinal beam, and at the movement interval, retracting rear single tracks of the front-section crane track and the rear-section crane track and splicing the retracted rear single tracks with the front single tracks of the front-section crane track and the rear-section crane track so as to enable the front-section crane track and the rear-section crane track to extend forwards along the longitudinal beam;
s5, stopping when the simple gantry crane is moved forwards to the rear inner side leg and the rear crane rail to be close to the first slide plate, retracting the rear inner side leg, retracting the front single rail of the rear crane rail and installing the retracted front single rail on a longitudinal beam which strides across the first slide plate forwards, then moving the simple gantry crane forwards to enable the rear inner side leg to stride across the first T-shaped beam forwards, and stopping and lowering the rear inner side leg to fall on the front single rail of the rear crane rail;
s6, retracting the rear outer side support legs, retracting a rear single track of the rear crane track, splicing the retracted rear single track and a front single track of the rear crane track which forwards crosses the first sliding plate into the rear crane track, and moving the simple gantry crane forwards to enable the rear outer side support legs to forwards cross the first T-shaped beam and put down the rear outer side support legs to fall on the spliced rear crane track;
s7, dragging the first sliding plate and the first T-shaped beam on the first sliding plate to a vacant position at the rear end of the longitudinal beam through the winch, and installing and fixing the first sliding plate and the first T-shaped beam;
s8, repeating the steps S3-S7, sequentially hoisting the second, third and fourth T-shaped beams to the second, third and fourth sliding plates, sequentially dragging the second, third and fourth T-shaped beams to the vacant positions, close to the first T-shaped beam, of the rear ends of the longitudinal beams, and installing and fixing the second, third and fourth T-shaped beams;
s9, repeating the step S8 but reversing the step S4-S8, moving the simple gantry crane backwards along the longitudinal beam, sequentially hoisting a fifth T-shaped beam, a sixth T-shaped beam, a seventh T-shaped beam and an eight T-shaped beam to a fifth sliding plate, a sixth sliding plate, a seventh sliding plate and an eight sliding plate, sequentially dragging the T-shaped beams to the vacant positions at the front end of the longitudinal beam, and installing and fixing the T-shaped beams;
s10, jacking the four T-shaped beams at the front end and the rear end of the longitudinal beam by using a jack, and drawing out the sliding plate and then putting down the T-shaped beams;
s11, laying upper rear crane rails of the T-shaped beams on the tops of the four T-shaped beams at the rear ends of the longitudinal beams, retracting the four rear supporting legs, moving the simple gantry crane backwards, then placing the simple gantry crane on the upper rear crane rails of the T-shaped beams, and dismantling the rear crane rails;
s12, intermittently moving the simple gantry crane forwards along the longitudinal beam again, and in the movement interval, retracting the front section crane track and the rear section crane track on the T-shaped beam and splicing the retracted rear section crane track with the front section crane track and the front section crane track on the T-shaped beam so as to enable the front section crane track and the rear section crane track on the T-shaped beam to extend forwards;
s13, continuously hoisting the T-shaped beams one by one to each vacant position on the longitudinal beam from the position close to the fourth T-shaped beam through the simple gantry crane along with each interval of the forward movement of the simple gantry crane step by step, and installing and fixing;
s14, when the length of the vacant position of the longitudinal beam where the T-shaped beam is not installed is smaller than or equal to the front-back length of the simple gantry crane along the moving direction, laying a front section crane rail on the T-shaped beam on the tops of the four T-shaped beams at the front end of the longitudinal beam, retracting the front four support legs, moving the simple gantry crane forwards, then placing the simple gantry crane on the front section crane rail on the T-shaped beam, and dismantling the front section crane rail;
s15, intermittently moving the simple gantry crane forwards along the longitudinal beam again, and in the movement interval, retracting the rear single-section rails of the front-section crane rail on the T-shaped beam and the rear-section crane rail on the T-shaped beam and splicing the retracted rear single-section rails with the front single-section rails of the front-section crane rail on the T-shaped beam and the rear-section crane rail on the T-shaped beam so as to enable the front-section crane rail on the T-shaped beam and the rear-section crane rail on the T-shaped beam to extend forwards until the front end of the longitudinal beam;
s16, hoisting the rest T-shaped beams to the rest vacant positions on the longitudinal beams one by one through the simple gantry crane along with each interval of the gradual forward movement of the simple gantry crane, and installing and fixing;
and S17, after all the T-shaped beams are hoisted, detaching the simple gantry crane and the crane track, and finishing construction.
The method has the beneficial effects that:
1) because the T-shaped beam is prefabricated in different places, the manufactured track flat car is transported to the lower part of the longitudinal beam by utilizing the existing railway track, compared with the existing mode of prefabricating the T-shaped beam on site and then hoisting, the problem of narrow construction site can be solved, the influence on the existing railway business line is small, the investment is less, and the safety factor is high;
2) the crane rails are spliced and laid above the longitudinal beams or the T-shaped beams in sections according to unit length, and can be disassembled and spliced from back to front or from front to back at any time according to the walking of the simple gantry crane, so that the two-way walking of the simple gantry crane on the longitudinal beams or the T-shaped beams can be flexibly ensured, the unbalance loading defect caused by the external arrangement of the crane rails in the prior art can be avoided, and the construction safety is improved;
3) because the designed and manufactured simple gantry crane adopts a plurality of telescopic legs, the simple gantry crane can cross the T-shaped beam and the sliding plate which are hoisted on the longitudinal beam, and free walking is realized;
4) the hoisted T-shaped beam is pulled to the vacant position on the longitudinal beam through the winch and the sliding plate, so that labor is saved, and the construction efficiency is improved;
in a word, the method can enable the T-shaped beam prefabricated in the shed tunnel to be more simply and conveniently hoisted.
Furthermore, the supporting legs are all made of square steel with the thickness of 200 multiplied by 5mm, the square steel with the thickness of 150 multiplied by 5mm is adopted in the middle of the supporting legs to be transversely connected, a girder is arranged at the top of the supporting legs, and an overhead traveling crane rail and an overhead traveling crane are arranged on the girder; the walking wheels at the bottoms of the supporting legs are driven by electric power and the height of the walking wheels is adjusted by hydraulic pressure, and the hydraulic adjustment stroke is larger than the height of the T-shaped beam; and the distances between the front four legs and the rear four legs in the walking direction of the longitudinal beam are larger than the width of the T-shaped beam.
Further, the crane rail is made of 36kg/m steel rails and can be repeatedly and temporarily fixed on the longitudinal beams or the T-shaped beams through expansion bolts, and the unit length is 1 m/joint.
Drawings
The T-shaped beam hoisting construction method of the railway shed tunnel is further explained with reference to the attached drawings.
FIG. 1 is a schematic side view of step S1-4 according to an embodiment of the present invention;
FIG. 2 is a schematic top view of step S1-4 according to an embodiment of the present invention;
FIG. 3 is a schematic side view of step S5 according to an embodiment of the present invention;
FIG. 4 is a schematic side view of step S6 according to an embodiment of the present invention;
FIG. 5 is a schematic side view of step S6 according to an embodiment of the present invention;
FIG. 6 is a schematic side view of step S7 according to an embodiment of the present invention;
FIG. 7 is a schematic side view of step S8-11 according to an embodiment of the present invention;
FIG. 8 is a schematic side view of step S12-15 according to an embodiment of the present invention;
wherein: 1-upright column, 2-longitudinal beam, 3-simple gantry crane, 4-T-shaped beam, 5-sliding plate, 6-winch, 7-crane track and 8-existing railway track.
Detailed Description
Examples
In the T-shaped beam hoisting construction method for the railway shed tunnel, the T-shaped beam 4 is prefabricated in an off-site different place, the upright posts 1 and the longitudinal beams 2 are installed in the excavated foundation pit of the shed tunnel, and the following steps are executed: s1, as shown in figure 1, the ground under the longitudinal beam 2 is an existing railway track 8 leading to an off-site different place (a prefabricated T-shaped beam), windlasses 6 are respectively installed on the ground at the two ends of the longitudinal beam 2, and a simple gantry crane 3 and a crane track are erected on the longitudinal beam 2.
The simple gantry crane 3 is a telescopic multi-leg gantry crane, 4 groups of 8 support legs are arranged along the walking direction, and four front support legs and four rear support legs are arranged. The four front legs are divided into two pairs which are opposite and parallel along the running direction of the longitudinal beam 2, namely a pair of front outer legs and a pair of front inner legs. The four rear legs are divided into two pairs which are opposite and parallel along the running direction of the longitudinal beam 2, namely a pair of rear outer legs and a pair of rear inner legs. Each supporting leg is made of square steel with the thickness of 200 multiplied by 5mm and the height is 6.8 m; 150X 5mm square steel is adopted as the transverse connection in the middle. The top of the supporting leg is provided with a girder with the size of 720m multiplied by 36mm and the thickness of 5mm, and the girder is provided with a crown block rail and a crown block (an electric hoist). The walking wheels at the bottoms of the supporting legs are driven by electric power and can adjust the height (make the supporting legs telescopic) through hydraulic pressure, and the hydraulic pressure adjusting stroke is larger than the height of the T-shaped beam. The distance between the front four legs and the distance between the rear four legs along the walking direction of the longitudinal beam are both larger than the width of the T-shaped beam. Therefore, when the front part and the rear part of the simple gantry crane 3 are respectively supported by a pair of supporting legs, the safe operation can be realized.
The crane rail 7 is divided into a front section crane rail for placing the front four legs and a rear section crane rail for placing the rear four legs. The crane rails 7 are made of 36kg/m steel rails, and the crane rails 7 are formed by rapidly splicing a plurality of single rails with unit length (1 m/section); the simple gantry crane can be timely installed and dismantled according to the running of the simple gantry crane 3, and can be repeatedly and temporarily fixed on the longitudinal beam 2 or the T-shaped beam 4 through the expansion bolt.
S2, as shown in fig. 2, a rail car is installed on the existing railway rails 8, and the T-shaped girders 4 prefabricated at different places are transported to the bottom of the longitudinal girders 2 by the rail car.
S3, as shown in figure 1, paving a first sliding plate 5 on the longitudinal beam 2 between the front crane track and the rear crane track, and hoisting a first T-shaped beam 4 to the first sliding plate 5 by using a simple gantry crane 3;
s4, as shown in fig. 1, intermittently moving the simple gantry crane 3 forward (toward the front end of the longitudinal beam 2) along the longitudinal beam 2, at the movement interval, retracting the rear single-track sections of the front-section crane track and the rear-section crane track, and splicing the retracted rear single-track sections with the front single-track sections of the front-section crane track and the rear-section crane track, so that the front-section crane track and the rear-section crane track extend forward;
s5, as shown in figure 3, when the simple gantry crane 3 is moved forward until the rear inner side leg and the rear crane rail approach the first slide plate 5, stopping, collecting the rear inner side leg, collecting the front single rail of the rear crane rail and installing the collected front single rail on the longitudinal beam 2 crossing the first slide plate 5 forward, then moving the simple gantry crane 3 forward to make the rear inner side leg cross the first T-shaped beam 4 forward, and stopping and putting down the rear inner side leg on the single rail at the front part of the rear crane rail crossing the longitudinal beam 2 of the first slide plate 5 forward;
s6, as shown in figures 4 and 5, retracting the rear outer side legs, retracting the rear single track of the rear crane track, splicing the retracted rear single track and the front single track of the rear crane track which crosses the first slide plate 5 forwards to form the rear crane track, and moving the simple gantry crane 3 forwards to enable the rear outer side legs to cross the first T-shaped beam 4 forwards and put down the rear outer side legs to fall on the spliced rear crane track;
s7, as shown in FIG. 6, dragging the first sliding plate 5 and the first T-shaped beam 4 on the first sliding plate to the vacant position at the rear end of the longitudinal beam 2 through the winch 6, and installing and fixing the first sliding plate and the first T-shaped beam;
s8, as shown in FIG. 7, repeating the steps S3-S7, sequentially hoisting the second, third and fourth T-shaped beams 4 to the second, third and fourth sliding plates 5, sequentially dragging the second, third and fourth T-shaped beams to the vacant positions at the rear ends of the longitudinal beams 2 close to the first T-shaped beam 4, and installing and fixing the second, third and fourth T-shaped beams;
s9, as shown in FIG. 7, repeating the step S8 but reversing the steps S4-S8, moving the simple gantry crane 3 backwards along the longitudinal beam 2 (towards the rear end of the longitudinal beam 2), hoisting the fifth, sixth, seventh and eight T-shaped beams 4 to the fifth, sixth, seventh and eight sliding plates 5 in sequence, dragging the beams to the vacant positions at the front end of the longitudinal beam in sequence, and installing and fixing the beams;
s10, as shown in figure 7, jacking four T-shaped beams 4 at the front end and the rear end of the longitudinal beam 2 by using a jack, and drawing out the sliding plate 5 and then putting down the T-shaped beams 4;
s11, as shown in FIG. 7, laying an upper rear crane rail of the T-shaped beam on the tops of the four T-shaped beams 4 at the rear end of the longitudinal beam 2, retracting the four rear supporting legs, moving the simple gantry crane backwards, laying down the simple gantry crane on the upper rear crane rail of the T-shaped beam, and dismantling the upper rear crane rail of the longitudinal beam 2;
s12, as shown in fig. 8, intermittently moving the simple gantry crane 3 forward (toward the front end of the longitudinal beam 2) along the longitudinal beam 2 again, and at the movement interval, retracting the rear single-track sections of the front-section crane track and the upper rear-section crane track of the T-shaped beam and splicing the retracted rear single-track section with the front single-track sections of the front-section crane track and the upper rear-section crane track of the T-shaped beam so as to extend the front-section crane track and the upper rear-section crane track of the T-shaped beam forward;
s13, as shown in fig. 8, with each interval of the forward movement of the simple gantry crane 3, continuously hoisting the T-shaped beams 4 one by one to the vacant positions on the longitudinal beam 2 from the position close to the fourth T-shaped beam by the simple gantry crane 3, and installing and fixing;
s14, as shown in FIG. 8, when the length of the vacant position of the left non-installed T-shaped beam 4 on the longitudinal beam 2 is less than or equal to the front and back length of the simple gantry crane 3 along the moving direction, laying a front section crane rail on the T-shaped beam on the tops of four T-shaped beams 4 at the front end of the longitudinal beam 2, retracting four front legs, moving the simple gantry crane 3 forward, then putting down the crane rail on the front section crane rail on the T-shaped beam, and dismantling the front section crane rail on the longitudinal beam 2;
s15, as shown in fig. 8, intermittently moving the simple gantry crane 3 forward (toward the front end of the longitudinal beam 2) along the longitudinal beam 2 again, and at the movement interval, retracting the rear single-section rails of the front-section crane rail on the T-shaped beam and the rear-section crane rail on the T-shaped beam and splicing the retracted rear single-section rails with the front single-section rails of the front-section crane rail on the T-shaped beam and the rear-section crane rail on the T-shaped beam, so that the front-section crane rail on the T-shaped beam and the rear-section crane rail on the T-shaped beam extend forward to the front end of the longitudinal beam 2;
s16, hoisting the rest T-shaped beams 4 to the rest vacant positions on the longitudinal beams 2 one by one through the simple gantry crane 3 along with each interval of the gradual forward movement of the simple gantry crane 3, and installing and fixing;
and S17, after all the T-shaped beams 4 are hoisted, the simple gantry crane 3 and the crane track 7 are dismantled, and the construction is finished.
The above description is only exemplary of the present invention, and all equivalents and modifications of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. A T-shaped beam hoisting construction method for a railway shed tunnel is characterized in that the T-shaped beam is prefabricated in an off-site different place, and a stand column and a longitudinal beam are installed in an excavated foundation pit of the shed tunnel, and the method comprises the following steps:
s1, respectively installing windlasses on the ground at the two ends of the longitudinal beam, and building a simple gantry crane and a crane rail on the longitudinal beam; the simple gantry crane is provided with a plurality of telescopic supporting legs; the multiple legs comprise four front legs and four rear legs which fall on the crane rail; the four front supporting legs are divided into two pairs which are opposite in parallel along the running direction of the longitudinal beam and respectively comprise a pair of front outer supporting legs and a pair of front inner supporting legs; the four rear supporting legs are divided into two pairs which are opposite in parallel along the running direction of the longitudinal beam and respectively comprise a pair of rear outer supporting legs and a pair of rear inner supporting legs; the crane rail is divided into a front section crane rail and a rear section crane rail, wherein the front section crane rail is used for placing the front four legs, and the rear section crane rail is used for placing the rear four legs;
s2, installing a rail flat car on the existing railway track, and transporting the T-shaped beam prefabricated at the different place to the bottom of the longitudinal beam by using the rail flat car;
s3, paving a first sliding plate on the longitudinal beam between the front-section crane rail and the rear-section crane rail, and hoisting a first T-shaped beam to the first sliding plate by using the simple gantry crane;
s4, intermittently moving the simple gantry crane forwards along the longitudinal beam, and at the movement interval, retracting rear single tracks of the front-section crane track and the rear-section crane track and splicing the retracted rear single tracks with the front single tracks of the front-section crane track and the rear-section crane track so as to enable the front-section crane track and the rear-section crane track to extend forwards along the longitudinal beam;
s5, stopping when the simple gantry crane is moved forwards to the rear inner side leg and the rear crane rail to be close to the first slide plate, retracting the rear inner side leg, retracting the front single rail of the rear crane rail and installing the retracted front single rail on a longitudinal beam which strides across the first slide plate forwards, then moving the simple gantry crane forwards to enable the rear inner side leg to stride across the first T-shaped beam forwards, and stopping and lowering the rear inner side leg to fall on the front single rail of the rear crane rail;
s6, retracting the rear outer side support legs, retracting a rear single track of the rear crane track, splicing the retracted rear single track and a front single track of the rear crane track which forwards crosses the first sliding plate into the rear crane track, and moving the simple gantry crane forwards to enable the rear outer side support legs to forwards cross the first T-shaped beam and put down the rear outer side support legs to fall on the spliced rear crane track;
s7, dragging the first sliding plate and the first T-shaped beam on the first sliding plate to a vacant position at the rear end of the longitudinal beam through the winch, and installing and fixing the first sliding plate and the first T-shaped beam;
s8, repeating the steps S3-S7, sequentially hoisting the second, third and fourth T-shaped beams to the second, third and fourth sliding plates, sequentially dragging the second, third and fourth T-shaped beams to the vacant positions, close to the first T-shaped beam, of the rear ends of the longitudinal beams, and installing and fixing the second, third and fourth T-shaped beams;
s9, repeating the step S8 but reversing the step S4-S8, moving the simple gantry crane backwards along the longitudinal beam, sequentially hoisting a fifth T-shaped beam, a sixth T-shaped beam, a seventh T-shaped beam and an eight T-shaped beam to a fifth sliding plate, a sixth sliding plate, a seventh sliding plate and an eight sliding plate, sequentially dragging the T-shaped beams to the vacant positions at the front end of the longitudinal beam, and installing and fixing the T-shaped beams;
s10, jacking the four T-shaped beams at the front end and the rear end of the longitudinal beam by using a jack, and drawing out the sliding plate and then putting down the T-shaped beams;
s11, laying upper rear crane rails of the T-shaped beams on the tops of the four T-shaped beams at the rear ends of the longitudinal beams, retracting the four rear supporting legs, moving the simple gantry crane backwards, then placing the simple gantry crane on the upper rear crane rails of the T-shaped beams, and dismantling the rear crane rails;
s12, intermittently moving the simple gantry crane forwards along the longitudinal beam again, and in the movement interval, retracting the front section crane track and the rear section crane track on the T-shaped beam and splicing the retracted rear section crane track with the front section crane track and the front section crane track on the T-shaped beam so as to enable the front section crane track and the rear section crane track on the T-shaped beam to extend forwards;
s13, continuously hoisting the T-shaped beams one by one to each vacant position on the longitudinal beam from the position close to the fourth T-shaped beam through the simple gantry crane along with each interval of the forward movement of the simple gantry crane step by step, and installing and fixing;
s14, when the length of the vacant position of the longitudinal beam where the T-shaped beam is not installed is smaller than or equal to the front-back length of the simple gantry crane along the moving direction, laying a front section crane rail on the T-shaped beam on the tops of the four T-shaped beams at the front end of the longitudinal beam, retracting the front four support legs, moving the simple gantry crane forwards, then placing the simple gantry crane on the front section crane rail on the T-shaped beam, and dismantling the front section crane rail;
s15, intermittently moving the simple gantry crane forwards along the longitudinal beam again, and in the movement interval, retracting the rear single-section rails of the front-section crane rail on the T-shaped beam and the rear-section crane rail on the T-shaped beam and splicing the retracted rear single-section rails with the front single-section rails of the front-section crane rail on the T-shaped beam and the rear-section crane rail on the T-shaped beam so as to enable the front-section crane rail on the T-shaped beam and the rear-section crane rail on the T-shaped beam to extend forwards until the front end of the longitudinal beam;
s16, hoisting the rest T-shaped beams to the rest vacant positions on the longitudinal beams one by one through the simple gantry crane along with each interval of the gradual forward movement of the simple gantry crane, and installing and fixing;
and S17, after all the T-shaped beams are hoisted, detaching the simple gantry crane and the crane track, and finishing construction.
2. The railway shed tunnel T-shaped beam hoisting construction method according to claim 1, characterized in that: the supporting legs are all made of square steel with the thickness of 200 multiplied by 5mm, the square steel with the thickness of 150 multiplied by 5mm is adopted in the middle of the supporting legs to be transversely connected, a girder is arranged at the top of the supporting legs, and an overhead traveling crane rail and an overhead traveling crane are arranged on the girder; the walking wheels at the bottoms of the supporting legs are driven by electric power and the height of the walking wheels is adjusted by hydraulic pressure, and the hydraulic adjustment stroke is larger than the height of the T-shaped beam; and the distances between the front four legs and the rear four legs in the walking direction of the longitudinal beam are larger than the width of the T-shaped beam.
3. The railway shed tunnel T-shaped beam hoisting construction method according to claim 1, characterized in that: the crane rail is made of 36kg/m steel rails and can be repeatedly and temporarily fixed on the longitudinal beams or the T-shaped beams through expansion bolts, and the unit length is 1 m/joint.
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| CN102433844B (en) * | 2011-09-26 | 2014-08-06 | 中交四航局第一工程有限公司 | Method for erecting prefabricated beam of bridge deck |
| CN108589568B (en) * | 2018-05-04 | 2020-03-27 | 中铁四局集团第二工程有限公司 | Rapid construction method for shed tunnel T-shaped beam crossing business line in narrow space |
| CN109056541A (en) * | 2018-08-28 | 2018-12-21 | 中国二十冶集团有限公司 | Transportation resources from ground transport I-beam to bridge floor |
| CN208932821U (en) * | 2018-10-30 | 2019-06-04 | 中交路桥建设有限公司 | A kind of erecting beam construction height leg gantry crane |
| CN110700103B (en) * | 2019-10-16 | 2022-04-08 | 中铁工程服务有限公司 | Construction method of continuous composite beam |
| CN111254760A (en) * | 2020-03-05 | 2020-06-09 | 中铁九局集团第七工程有限公司 | Construction method for laying track slab by using gantry crane |
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