CN111576111A - Frame bridge jacking railway turnout reinforcement construction method - Google Patents
Frame bridge jacking railway turnout reinforcement construction method Download PDFInfo
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- CN111576111A CN111576111A CN202010471181.1A CN202010471181A CN111576111A CN 111576111 A CN111576111 A CN 111576111A CN 202010471181 A CN202010471181 A CN 202010471181A CN 111576111 A CN111576111 A CN 111576111A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B37/00—Making, maintaining, renewing, or taking-up the ballastway or the track, not provided for in a single one of groups E01B27/00 - E01B35/00
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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Abstract
The invention discloses a construction method for reinforcing a railway turnout by jacking a frame bridge, which comprises the following steps: (1) preparing for construction; (2) reinforcing the cross beam; (3) fastening the rail for reinforcement; (4) reinforcing the longitudinal beam; (5) and checking and accepting. The geometric dimension of the turnout static inspection in the whole process completely meets the requirement, and the settlement observation point data analysis shows that the rigidity, stability and performance of each part of the reinforced turnout meet the safe use requirement. The construction of the invention ensures the driving safety of the business line, shortens the construction period while saving the resource investment, and satisfactorily realizes various plan indexes.
Description
Technical Field
The invention belongs to the field of railway construction, and particularly relates to a construction method for reinforcing a railway turnout by jacking a frame bridge.
Background
The existing equipment must be reinforced before the frame bridge is jacked into the underpass railway for construction. The line reinforcement usually adopts a reinforcement system of longitudinal and transverse beams and buckling rails, the longitudinal and transverse beams are I-shaped steel and are arranged in a transverse lifting and longitudinal picking mode, the buckling rails adopt 43kg/m or 50kg/m steel rails to form 3-5-3 rail beam bundles in a positive and negative buckling mode, and the construction method is widely used and has mature technology. When the construction mileage of the bridge site is within the station range, the jacking route may encounter a turnout area or a turnout junction area. The turnout is used as a transfer-in connecting device among the tracks and is laid in a station in a large number, the reinforcing quality is influenced due to the complex structure of the turnout, the reinforcing system is weaker than a line, the safety risk coefficient is increased along with the weakening of the turnout, and the daily maintenance and repair amount is large.
Disclosure of Invention
The invention aims to provide a construction method for reinforcing a railway turnout by jacking a frame bridge, which is suitable for the construction of reinforcing the turnout in a turnout line combination area in the process of newly adding bridges on two sides of an existing bridge, and jacking the frame bridge under the condition of meeting the normal use of the turnout.
The invention is realized by adopting the following technical scheme:
a frame bridge jacking railway turnout strengthening construction method comprises the following steps:
(1) preparation for construction
Checking the intervals of the switch sleepers, lofting the cross beam, correspondingly marking the positions of the buckling rails on the two sides, the U-shaped bolts, the sleeper blocks and the longitudinal beams on the cross beam, and making marks;
the turnout straight strand is used as a reference rail, the cross beam I-shaped steel is controlled to penetrate through the turnout straight strand, and the turnout straight strand is adjusted according to the actual condition when meeting an obstacle; and after speed limiting, the connecting parts of the reinforcing equipment are checked and tightened again in the reinforcing range of the turnout, so that the structural stability of the turnout is ensured.
(2) Beam reinforcement
The cross beam is I45 b type I steel and is vertically arranged in a neutral position between the switch sleepers at a distance of 0.6 m; the length of a cross beam from a point switch to a frog heel section is 12m +6m, and a joint is connected and supported by a bolt; the length of the long switch tie section beam from the switch to the switch is 12 m;
firstly, emptying railway ballast in a switch sleeper neutral position, manually completing the penetration of a cross beam by adopting an electric traction winch matched with a worker, wherein the winch is arranged on two sides of the switch, a traction rope is tied at the end of the cross beam, and the middle part of the cross beam is manually pulled by using a crowbar to control the traction direction and pull the cross beam I-steel into a dug groove; when one support pad is worn, the support pad is lifted in time, and a lower root beam is worn after the treatment is good;
the bamboo plywood on the crossbeam is attached to the bottom slope of the turnout rail, the level of the crossbeam is required to meet the requirements of the bottom slope of the existing rail, a wood pad is added according to the existing line condition, the compact and uniform stress of the load fit surface is ensured, the plane position of the turnout is kept, and the normal performance of each part of the turnout is ensured;
the cross beam is welded with the longitudinal beam at the top of the supporting pile to ensure that the line does not generate transverse displacement; meanwhile, a sleeper head is arranged between the D beam and the longitudinal beam on the outer side of the adjacent line to provide lateral support.
(3) Fastening rail reinforcement
The buckling rails are 43kg/m rails and are arranged at the outer sides of the switch sleepers and the centers of the switch inner roads according to the arrangement form of 3-5-3, the switch outer side is buckled with 3 buckles, the switch inner side is buckled with 5 buckles, and the manual lifting pendulum is installed in place; the joint space between the buckling rails is staggered by more than 1.5m, and is also staggered with the joints in the turnout, and when the outer buckling rail of the turnout is installed, the steel rail is buckled at the position of a pre-marked cross beam and locked to form a rail beam; the rail buckling beam is connected with the cross beam through a U-shaped bolt and a buckle plate and is bound with the turnout to form an integral structure;
the buckling rails on the outer side 3 of the switch tie are laid in a penetrating way, and the whole line type is laid according to the position of the switch tie; the 5 buckling rails are arranged at the road center in sections (wherein the straight strand 2 section and the curved strand 1 section) and are respectively arranged at the straight strand road center and the curved strand road center of the straight strand joint section, the switch point heel end and the long switch tie section at the back of the switch point from the tail end of the switch machine to the front of the switch point.
The buckling rails are disconnected according to the actual conditions on site and extend to meet the inserting requirement and the reinforcing length, square timbers are used as side supports and used for tightly driving wood wedges between the outer strand steel rails of the turnout and the buckling rails in order to keep the stability of turnout parts, and the wood wedges are not driven into the range of the switch rails.
(4) Longitudinal beam reinforcement
The longitudinal beams are I45 b I-shaped steel, one beam of the two beams is arranged on two sides of the cross beam, one end of a fulcrum is arranged on the old bridge, the other end of the fulcrum is arranged on the supporting pile, and the supporting pile is manually lifted and arranged in place; 3 longitudinal beams are arranged, wherein 1 longitudinal beam is arranged on the straight side of a turnout, and the distance between the longitudinal beams and a buckling rail needs to avoid the contact of a net rod at a frog and is distributed according to a horn shape; 2 turnouts are arranged laterally and distributed in a linear mode according to turnout sleepers, wherein the distance between the 1 st turnout is 0.5m, and the distance between the 2 nd turnout is 5.5 m; the longitudinal beam joints are connected by high-strength bolts, and the beam binding joints are staggered by more than 1.5 m;
the strength index of the reinforcing pivot is detected before the longitudinal beam is laid, the U-shaped bolt, the buckle plate and the cross beam are connected into a whole, a sleeper stack is arranged under the longitudinal beam for firm support, and all reinforcing component plates are connected into a frame structure to wrap and reinforce the turnout.
(5) Checking and accepting
Strengthening daily inspection of the travelling equipment, and executing inspection after entering the line according to the once-per-hour detection frequency before entering the line;
the special person on site uses the track gauge to check the track gauge and level of the turnout and makes a record;
the connection condition of the longitudinal beam, the transverse beam and the fastening rail is checked, the train is checked to be loosened and tightened again through a rear check bolt, whether a bolt rod and a fastening plate are loosened or damaged or not is judged, the wood wedge and the bamboo plywood are timely corrected when the positions are deviated, and the integral stress condition of the reinforcing part is checked.
The applicant establishes the reinforcement of the No. 44 turnout of the Fenghe station by cooperating the communication force of the Taiyuan engineering section, the electric service section and other equipment units in the pushing project of a six-frame bridge passing through the northwest channel of the Taiyuan city new shop street and promoting the advantages and avoiding the disadvantages in combination with the opinions of all the parties and summarizing the method.
The method of the invention has the following characteristics:
1. the construction process is simple and convenient, the operability is strong, the size of the reinforcing member is perfectly fit with the equipment, and the detection of turnout data is not influenced; the requirements on fields and equipment are low, special equipment is not needed, and the resource investment is low.
2. The turnout connection part and the frog part form an integral structure, so that the rigidity and stability of the turnout in use are ensured, the size change of the switch rail is reduced, and the integral reinforcement quality is ensured.
3. The method does not affect the normal use of the turnout in the jacking process, the stability of the point switch on an old bridge is good, the point rail can be freely switched and swung, the track gauge and the level of the frog part and the errors of 91 and 48 (the check interval refers to the distance from the working edge of the frog center to the working edge of the guard rail and is not less than 1391mm, the guard distance is 48 and refers to the distance from the working edge of the frog wing rail to the working edge of the guard rail and is not more than 1348 mm) meet the standard requirements, the equipment runs normally, and the running safety of the railway business line is ensured.
4. One end of a longitudinal beam is erected on an old bridge top plate, and a supporting pile is arranged at one end of the longitudinal beam; one end of the cross beam is welded with the longitudinal beam steel bars on the anti-sideslip piles, lateral support is provided between the longitudinal beam and the adjacent line D beam through sleepers, and the whole system is stable and safe.
5. The method provides more choices for construction when the underpass railway frame structure passes through the turnout in the throat area of the station yard.
The invention has reasonable design and good practical application value.
Drawings
FIG. 1 shows a schematic process flow diagram of the present invention.
Detailed Description
The following provides a detailed description of specific embodiments of the present invention.
Railway mileage of a three-standard Taiyuan frame bridge passing through a northwest channel of a new shop street of Taiyuan railway, which is born by the Taiyuan iron construction company of the six Central iron offices, is TLDK3+260.21 and TLDK3+289.61 respectively, frame structures are additionally arranged on two sides of an existing 1-15m frame structure, an included angle between the axis of the frame structure and the railway is 88.9 degrees, and the frame structures on the two sides respectively pass through a Fenghe station and a special Tai steel wire. The hole span structure is a single-hole integral frame structure, the net span is 1-9m, the total height of the X1 and D1 frame structures is 7.9m, and the axial length of the frame structures is 57.66m and 53.36 m; the total height of the X2 and D2 frame structures is 6.4m, the axial length of the frame structures is 17m and 10.5m, the top plate thickness of the frame structures is 0.6m, and the bottom plate thickness is 0.7 m.
The bridge position is penetrated through a Fenghe station and a special Tai-steel line, the Fenghe station comprises 6 main lines (a southwest ring left line, a VI way, a Tailan left line, a Tailan right line, a southwest ring right line and a Shanlangcun branch line), 2 arrival lines (1 and 8 ways), the 6 main lines and the 2 arrival lines are electrified railways, and comprise ballast tracks and concrete sleepers, the rail type of the main line is 60kg, and the rail type of the arrival line is 50 kg. The number 44# of the reinforced turnout is positioned at 8 Fenhe station, is connected with a station carriage line, and simultaneously gives consideration to the receiving and dispatching of vehicles by adjacent lines. And (3) formally limiting speed and giving a point for construction in 2019, 9-month and 1-day, organizing and finishing the reinforcement of No. 44 turnouts of the Fenhestation in 9-month and 13-day, and summarizing to form the following construction method.
A frame structure bridge jacking railway turnout strengthening construction method comprises the following steps:
(1) preparation for construction
The technician firstly checks the interval between the switch sleepers and lofts the cross beam, correspondingly marks the positions of the fastening rails on the two sides, the U-shaped bolts, the sleeper blocks and the longitudinal beams on the cross beam, makes marks by using white paint and hands over the marks to field operators.
And carrying out in-site transportation on reinforcing materials such as longitudinal beams, transverse beams, buckling rails and the like by adopting a flat car, transporting the passing existing northwest gate passage to the position near the prefabricated position of the frame structure, and then hoisting the passage to a temporary site beside a turnout to be reinforced by a 25t truck crane spanning a Tai-steel hill pipe.
The turnout straight strand is used as a reference rail, the cross beam I-shaped steel is controlled to penetrate, and the turnout straight strand is adjusted according to actual conditions when meeting obstacles such as a contact net rod. And after speed limiting, the connecting parts of the reinforcing equipment are checked and tightened again in the reinforcing range of the turnout, so that the structural stability of the turnout is ensured.
The main materials are shown in Table 1 below
TABLE 1
Main construction equipment is shown in Table 2 below
TABLE 2
(2) Beam reinforcement
The crossbeam adopts I45 b type I-shaped steel, erects to arrange in the free position between the switch tie, and the interval is 0.6 m. The length of a cross beam from a point switch to a frog heel section is 12m +6m, and a joint is connected and supported by a bolt; the length of the beam of the long switch tie section from the frog heel to the switch is 12 m.
The beam grooving follows the principle of 'one through at intervals', and manual excavation is adopted. Firstly, a switch sleeper neutral position railway ballast is hollowed, an electric traction winch is adopted to match with manual work to complete the penetration of a cross beam, the winch is arranged on two sides of a turnout, a traction rope is tied at the end of the cross beam, the middle part of the cross beam is manually pulled by a crowbar to control the traction direction, and cross beam I-shaped steel is pulled into a dug groove. When one support pad is worn, the lower root beam is worn to be leveled up, and the lower root beam is worn after the treatment is good.
Bamboo plywood on the crossbeam and the laminating of switch rail base slope, the crossbeam level must accord with existing rail base slope requirement, adds the cushion plank according to existing line conditions, guarantees that the load agrees with the face closely, evenly atress, keeps the plane position of switch, ensures that each position performance of switch is normal.
The I-shaped steel cross beam and the supporting pile top longitudinal beam are welded to ensure that the line does not generate transverse displacement. Meanwhile, a sleeper head is arranged between a D beam (the D beam is a D-shaped temporary beam, and the business line construction is used for reinforcing and supporting steel rails, and is special railway reinforcing equipment formed by shaping a longitudinal beam, a cross beam, a bracket, an inclined rod and a connecting plate) on the outer side of the adjacent line and the longitudinal beam to provide lateral support.
(3) Fastening rail reinforcement
The buckling rails are 43kg/m rails and are arranged at the outer sides of the switch sleepers and the inner track center of the switch according to the arrangement form of 3-5-3, the switch is externally buckled by 3, the switch is internally buckled by 5, and the manual lifting pendulum is installed in place. The buckling rails are assembled in a sleeve penetrating mode, connectors are connected through fishplates and high-strength bolts, the connector intervals among the buckling rails are staggered by more than 1.5m and are staggered with the connectors in turnouts, and steel rails are buckled at the positions of pre-scribed cross beams when the outer buckling rails of the turnouts are installed to form rail beam bundles in a locked mode. The rail buckling beam and the cross beam are connected by phi 22U-shaped bolts and buckling plates and are bound with the turnout to form an integral structure.
The buckling rails on the outer side 3 of the switch tie can be laid in a penetrating way, and the whole line type is laid according to the position of the switch tie. The 5 buckling rails are arranged at the road center in sections (wherein the straight strand 2 section and the curved strand 1 section) and are respectively arranged at the straight strand road center and the curved strand road center of the straight strand joint section, the switch point heel end and the long switch tie section at the back of the switch point from the tail end of the switch machine to the front of the switch point. When the size of the buckling rail is limited by 5 at the intersection point of the straight and curved strands, the bolts and the backing plate are avoided, and 3 buckling rails are arranged for transition. In this embodiment, the 44# turnout is a P50-9 unidirectional left turnout, the turnout has 3 intersections, the buckling rails are installed and extended and laid in opposite directions as far as possible, namely, straight and lateral inner and outer turnouts, straight inner strand and lateral outer strand and frog toe end joints, because the gap between the buckling plates is limited in size and becomes narrow, the buckling rails need to be changed from 5 buckling rails to 3 buckling rails, the transition range is 6 empty sleeper intervals, and the end must be provided with buckling plates in a strict swinging manner. The fastening rail is connected with the cross beam by a phi 22U-shaped bolt and a buckle plate.
The buckling rails are disconnected in combination with the actual situation on site, the insertion requirements and the reinforcement length are met by extending the buckling rails as far as possible, square timbers are used as side supports and the wood wedges are tightly driven between the outer strand steel rails of the turnout and the buckling rails for keeping the stability of turnout parts, and the wood wedges are strictly prevented from being driven into the switch rails.
(4) Longitudinal beam reinforcement
The longitudinal beams are I45 b I-shaped steel, one beam of the two I-shaped steel beams is arranged on two sides of the cross beam, one end of a fulcrum is arranged on the old bridge, the other end of the fulcrum is arranged on the supporting pile, and the supporting pile is manually lifted and arranged in place. 3 longitudinal beams are arranged, wherein 1 longitudinal beam is arranged on the straight side of a turnout, and the distance between the longitudinal beams and a buckling rail needs to avoid the contact of a net rod at a frog and is distributed according to a horn shape; and 2 tracks are arranged on the lateral side of the turnout and are distributed according to the turnout tie line type, wherein the track 1 is 0.5m away from the fastening rail, and the track 2 is 5.5m away from the fastening rail. The longitudinal beam has smooth line type and no obvious warping phenomenon, the joints of the longitudinal beam are connected by high-strength bolts, and the joints between the beam binding and the beam binding are staggered by more than 1.5 m.
The longitudinal beam serves as the outermost side and the upper component in the reinforcing system, plays a role in lifting and picking the turnout and other reinforcing components by means of the fulcrum, the strength index of the reinforcing fulcrum is detected before laying, a phi 22U-shaped bolt, a buckle plate and a cross beam are connected into a whole, a sleeper pile is arranged below the longitudinal beam for firm support, and all reinforcing component plates are connected into a frame structure to wrap and reinforce the turnout.
(5) Checking and accepting
The daily inspection of the driving equipment is enhanced, the inspection condition of the existing equipment is listed as the production meeting issue when the vehicle is handed over every time, and the vehicle is familiar with the equipment attributes and the attention items such as the engineering, the electricity affairs, the power supply and the like in the reinforcement range. 17 detection points are arranged on the turnout, detection is carried out once per hour before entering the line, and detection is carried out after entering the line.
The special person on site uses the track gauge to check the track gauge and level of the turnout and makes a record to determine whether the direction of the supporting distance is good. The level of the turnout lifted by the whole crossbeam basically meets the requirement, and meanwhile, the forward and backward line connection conditions of the turnout are controlled in a key manner, so that the whole smoothness is achieved. Whether the tip of the switch rail of the switch part is warped and attached closely, the data of the frog parts 91 and 48 and the track gauge change situation of the guide curve are focused, and the normal operation of all parts of the turnout is ensured.
The connection condition of the longitudinal beam and the fastening rail is checked, the train is checked after passing through the rear check bolt to be loosened and tightened, whether the bolt rod and the fastening plate are loosened and damaged or not is checked, the wood wedge and the bamboo plywood are timely corrected when the positions are deviated, and the integral stress condition of the reinforcing part is checked. And (3) dynamically detecting the deflection of the longitudinal and transverse beams on site, recording data, analyzing and comparing the data, providing guidance suggestions for site construction, removing equipment faults in time and keeping the turnout stable.
In the embodiment, the geometric dimension of the whole turnout static inspection completely meets the requirement, and the settlement observation point data analysis shows that the rigidity, stability and performance of each part of the reinforced turnout meet the safe use requirement. The construction of the invention ensures the driving safety of the business line, shortens the construction period while saving the resource investment, and satisfactorily realizes various plan indexes.
Second, the process principle
2.1, the switch system of consolidating is that the crossbeam lifts the longeron and chooses + detains the rail and arrange, and the crossbeam is stood in the middle of the sleeper and is lifted the switch section of digging out, is the reinforcement component of lower most portion, and longeron and detain the rail and for connecting the switch transmission atress through the crossbeam. The longitudinal beam and the lifting beam are main bearing points, one end of the longitudinal beam is erected on the old bridge top plate, and the other end of the longitudinal beam and the lifting beam is provided with a supporting pile. The buckling rails are arranged at the track centers outside and inside the turnout, and play a role in keeping the balance of the turnout assembly, stabilizing the performance of each part and preventing the connector from fluctuating.
2.2, the beam is penetrated and arranged by an electric traction winch to be matched with manpower. The lifting rod and the clamp are manually used at the front end of the cross beam to lift the I-shaped steel, the middle crow bar is used for poking and picking to control the advancing direction of the I-shaped steel, the bamboo rubber plate is lined in the whole process after the I-shaped steel enters the turnout, and a special person holds the rubber pad to assist the cross beam to pass the turnout. After the beam is in place, the safety is firstly ensured at two ends, and after adjustment, a wooden wedge is nailed between the steel rail and the bamboo plywood at the outer side of the turnout to transmit load, but the wooden wedge is strictly nailed within the range of the switch rail and the slide chair plate.
And 2.3, the buckling rails are arranged in a buckling rail outer 3 and buckling rail inner 5 mode, and the laying length extends to a long switch tie behind the switch. The turnout outer buckling rail is laid in a penetrating way, and a square wood support is arranged between the steel rail on the outer side of the turnout and the turnout outer buckling rail. The turnout internal buckling rail is arranged from the rear section of the switch machine to the straight track core close to the toe end of the frog, and the straight track core and the curved track core from the straight-curved intersection to the long turnout sleeper section, and the size limitation of the turnout straight-curved track buckling plate needs to be changed from 5 buckling rails to 3 buckling rails to complete transition, and the transition range is 6 empty sleeper intervals, and the buckling rails are connected with the cross beam by adopting phi 22U-shaped bolts and buckling plates.
2.4, two longitudinal beams are arranged on two sides of the turnout outer buckling rail. The longitudinal beam is provided with 3 tracks, the straight strand side is provided with 1 track, the curved strand side is in an integral turnout scattering form, therefore, the curved strand is provided with 2 tracks, the longitudinal beam and the cross beam are connected by adopting a phi 22U-shaped lengthened bolt and a buckle plate, the reinforcing component is communicated and connected in series to form an integral structure, and the turnout connection part and the frog part are kept stable.
Quality control
3.1, the U-shaped bolts, the buckle plates and various connecting pieces have to meet the use strength, the abrasion of the rail beam cannot exceed the standard, the material quality and the section size of the I-shaped steel meet the national standard requirements, and the reinforcement use strength is prevented from being reduced.
3.2, the turnout reinforcement quality must meet the acceptance standards of railway bridge and culvert construction quality and the safety rules of railway work. Whether the turnout can normally work is directly influenced by the integral stress condition of the cross beam and the stability of the turnout, and the level of each I-steel cross beam and the height of the I-steel in the turnout zone are ensured to meet the requirement of the gradient of the rail surface of the existing line during reinforcement; the crossbeam is firmly connected with the buckling rails and the longitudinal beams to form an integral stress state, and a specially-assigned person is arranged to check the working state and the stress condition of the reinforcing equipment.
3.3, 3, provide the side direction with imitative wood between 3 knot rails in the switch outside and the outer strand rail of switch and support the reinforcement switch, ensure that the switch keeps original true position, do not take place lateral displacement.
3.4, a special person is arranged on site to check the size, deformation and movement conditions of each part of the turnout, and the running condition of the equipment, including the switch rail, the switch part, the guide curve and the frog part, is dynamically monitored. And if the abnormality is found, notifying a field responsible person in time, and taking corresponding measures to adjust in time to keep each part of the turnout to work normally all the time.
Fourth, safety measure
4.1, a project department organizes and establishes a full-time line renovation group and a safety inspection group, and the line renovation group is responsible for line state monitoring, geometric dimension inspection and renovation work. And the safety inspection group performs inspection at any time and is responsible for construction protection.
4.2, when the I-steel beam is worn, a specially-assigned person adds a wood pad between the beam and the main rail to prevent the rail from being connected with electricity due to construction. When the I-steel is installed, the special clip and the firm rope are used, a specially-assigned person conducts commands, actions are unified, and personal safety is guaranteed.
4.3, the buckling beam is not higher than the turnout main rail and is firmly connected with the cross beam. A bamboo rubber plate is additionally arranged on the cross beam to avoid electricity connection. The shuttle heads are additionally arranged at the two ends of the buckling rail and the longitudinal beam and are firmly fixed, so that the reinforcing length is ensured and the railway clearance cannot be invaded.
4.4, a wooden wedge is tied between the turnout outer strand steel rail and the beam I-steel, so that the strength and the geometric dimension of the reinforced steel rail are ensured, and the turnout condition is always kept in a good state.
4.5, the beam is adjusted to be flat in time after the beam is penetrated and arranged, the longitudinal beam is installed in time after the beam support pad is reinforced, and a reinforcing system is pushed to be formed, so that the beam keeps a good stress state.
4.6 in the construction process, the track jack, the small jack, the chain block, the I-steel, the sleeper, the crowbar, the wrench and other necessary material tools are prepared on site, and the emergency rescue tool is used for preventing the deformation of the line.
4.7, preparing a wooden wedge, firmly striking the loosened position by using the wooden wedge, and striking the wooden wedge between the lower part of the main rail and the cross beam of the line at any time to ensure that the line does not deform; and (4) preparing a first-level railway ballast, tamping and maintaining the line, and ensuring the good state of the line.
And 4.8, commanding the constructors to command in a unified way, wherein all the constructors on the site must obey the site commander. Tools and materials are strictly forbidden to be stacked on the railway running line. The constructors are strictly prohibited to stop, sit and lie on the line at will so as to ensure the railway driving and personal safety.
4.9, an effective protection method is adopted for the existing equipment influencing the construction, such as a cable box, an infrared thermometer, a signal machine cable and other equipment, and the special person is clearly marked.
4.10, relevant regulations and regulations of the electrified railway must be complied with in construction, and various safety regulations of the construction of a business line.
Fifth, benefit analysis
5.1, social benefits
The method effectively solves the problem of reinforcing the turnout in the turnout junction area in construction, is an innovation of bridge and culvert jacking construction technology, is scientific and reasonable in reinforcing system, and ensures the rigidity and stability of the turnout area track. The reinforcing components are connected into a frame system, are supported by means of an old bridge structure, wrap and lift the turnout, avoid most of objective safety risk factors, fundamentally ensure the driving safety of business lines, stop personal injury accidents and achieve no substitution for safety benefits.
5.2, energy saving and environmental protection benefits
The maintenance workload is greatly reduced, and the investment of resources is reduced. When the old method is used for construction, in order to ensure the normal operation of the turnout, the jacking speed must be slowed down, and the maintenance frequency is improved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the detailed description is made with reference to the embodiments of the present invention, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which shall all fall within the protection scope of the claims of the present invention.
Claims (1)
1. A frame bridge jacking railway turnout reinforcement construction method is characterized by comprising the following steps: the method comprises the following steps:
(1) preparation for construction
Checking the intervals of the switch sleepers, lofting the cross beam, correspondingly marking the positions of the buckling rails on the two sides, the U-shaped bolts, the sleeper blocks and the longitudinal beams on the cross beam, and making marks;
the turnout straight strand is used as a reference rail, the cross beam I-shaped steel is controlled to penetrate through the turnout straight strand, and the turnout straight strand is adjusted according to the actual condition when meeting an obstacle; checking and re-tightening the connection parts of the reinforcing equipment within the reinforcing range of the turnout after limiting the speed, and ensuring the structural stability of the turnout;
(2) beam reinforcement
The cross beam is I45 b type I steel and is vertically arranged in a neutral position between the switch sleepers at a distance of 0.6 m; the length of a cross beam from a point switch to a frog heel section is 12m +6m, and a joint is connected and supported by a bolt; the length of the long switch tie section beam from the switch to the switch is 12 m;
firstly, emptying railway ballast in a switch sleeper neutral position, manually completing the penetration of a cross beam by adopting an electric traction winch matched with a worker, wherein the winch is arranged on two sides of the switch, a traction rope is tied at the end of the cross beam, and the middle part of the cross beam is manually pulled by using a crowbar to control the traction direction and pull the cross beam I-steel into a dug groove; when one support pad is worn, the support pad is lifted in time, and a lower root beam is worn after the treatment is good;
the bamboo plywood on the crossbeam is attached to the bottom slope of the turnout rail, the level of the crossbeam is required to meet the requirements of the bottom slope of the existing rail, a wood pad is added according to the existing line condition, the compact and uniform stress of the load fit surface is ensured, the plane position of the turnout is kept, and the normal performance of each part of the turnout is ensured;
the cross beam is welded with the longitudinal beam at the top of the supporting pile to ensure that the line does not generate transverse displacement; meanwhile, a sleeper head is arranged between the D beam and the longitudinal beam on the outer side of the adjacent line to provide lateral support;
(3) fastening rail reinforcement
The buckling rails are 43kg/m rails and are arranged at the outer sides of the switch sleepers and the centers of the switch inner roads according to the arrangement form of 3-5-3, the switch outer side is buckled with 3 buckles, the switch inner side is buckled with 5 buckles, and the manual lifting pendulum is installed in place; the joint space between the buckling rails is staggered by more than 1.5m, and is also staggered with the joints in the turnout, and when the outer buckling rail of the turnout is installed, the steel rail is buckled at the position of a pre-marked cross beam and locked to form a rail beam; the rail buckling beam is connected with the cross beam through a U-shaped bolt and a buckle plate and is bound with the turnout to form an integral structure;
the buckling rails on the outer side 3 of the switch tie are laid in a penetrating way, and the whole line type is laid according to the position of the switch tie; the 5 buckling rails in the switch are respectively arranged on a straight strand joint section from the tail end of the switch machine to the front of the switch point of the frog core, and a straight strand core and a curved strand core from the heel end of the switch rail to the long switch tie section behind the switch;
the buckling rails are disconnected according to the actual situation of the site and extend to meet the inserting requirement and the reinforcing length, square timbers are used as side supports and are used for tightly driving wood wedges between the outer strand steel rails of the turnout and the buckling rails in order to keep the turnout parts stable, and the wood wedges are not nailed in the range of the switch rails;
(4) longitudinal beam reinforcement
The longitudinal beams are I45 b I-shaped steel, one beam of the two beams is arranged on two sides of the cross beam, one end of a fulcrum is arranged on the old bridge, the other end of the fulcrum is arranged on the supporting pile, and the supporting pile is manually lifted and arranged in place; 3 longitudinal beams are arranged, wherein 1 longitudinal beam is arranged on the straight side of a turnout, and the distance between the longitudinal beams and a buckling rail needs to avoid the contact of a net rod at a frog and is distributed according to a horn shape; 2 turnouts are arranged laterally and distributed in a linear mode according to turnout sleepers, wherein the distance between the 1 st turnout is 0.5m, and the distance between the 2 nd turnout is 5.5 m; the longitudinal beam joints are connected by high-strength bolts, and the beam binding joints are staggered by more than 1.5 m;
detecting the strength index of a reinforcing fulcrum before laying a longitudinal beam, connecting a U-shaped bolt, a buckle plate and a cross beam into a whole, arranging a sleeper pillar under the longitudinal beam for firm support, and connecting all reinforcing component plates into a frame structure to wrap and reinforce turnouts;
(5) checking and accepting
The daily inspection of the travelling equipment is enhanced, the detection is carried out once per hour before the travelling equipment enters the line, and the inspection is carried out after the travelling equipment enters the line;
the special person on site uses the track gauge to check the track gauge and level of the turnout and makes a record;
the connection condition of the longitudinal beam, the transverse beam and the fastening rail is checked, the train is checked after passing through the rear check bolt to be loosened and tightened, whether the bolt rod and the fastening plate are loosened or damaged is judged, and the whole stress condition of the reinforcing part is checked by correcting the position deviation of the wood wedge and the bamboo plywood.
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