CN214271732U - Bridge construction that stridees across railway line is with dilatory device - Google Patents

Abstract

The utility model discloses a dragging device for bridge construction crossing railway lines, which comprises a support system and a pushing system, wherein the support system of a guiding and rectifying system comprises a fixed buttress, a temporary buttress, an assembling platform and a guide beam; the temporary buttresses are fixedly arranged on the ground and arranged on one side of the fixed buttresses, 2 splicing platforms are arranged, one splicing platform is arranged between the temporary buttresses on the side of pushing, the other splicing platform is arranged at the top of the erected T-shaped beam, a slideway girder is arranged on each splicing platform, and a slideway is arranged on each slideway girder; the guide beams are symmetrically arranged into 2 groups, the guide beams are arranged at the front end of the steel box girder, and the bottom parts of the guide beams and the steel box girder are provided with sliding blocks which are connected in a sliding way; the steel box girder and the guide girder are arranged on the assembly platform; the problem of the existing bridge that stretches across railway line construction difficulty is solved.

Description

Bridge construction that stridees across railway line is with dilatory device

Technical Field

The utility model relates to a bridge construction technical field, concretely relates to span bridge construction of railway line is with dilatory device.

Background

In the construction process of a simply supported steel box girder cross-railway branch line, a foundation and a pier stud of a near bridge are generally constructed firstly, a temporary pier and an assembling platform are mainly erected, the steel box girder and a guide beam are assembled on the assembling platform, and after the construction is finished, a method of front automatic continuous pushing jack dragging and rear continuous jack pushing is adopted to carry out construction so as to push the steel box girder to the pier stud.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a span bridge construction of railway line is with dilatory device solves the current problem of the bridge construction difficulty that spans the railway line.

In order to solve the technical problem, the utility model adopts the following technical scheme:

a dragging device for bridge construction crossing a railway line comprises a support system and a pushing system, wherein the support system of a guide deviation rectifying system comprises a fixed buttress, a temporary buttress, an assembling platform and a guide beam; the temporary buttresses are fixedly arranged on the ground and arranged on one side of the fixed buttresses, 2 splicing platforms are arranged, one splicing platform is arranged between the temporary buttresses on the side of pushing, the other splicing platform is arranged at the top of the erected T-shaped beam, a slideway girder is arranged on each splicing platform, and a slideway is arranged on each slideway girder; the guide beams are symmetrically arranged into 2 groups, the guide beams are arranged at the front end of the steel box girder, and the bottom parts of the guide beams and the steel box girder are provided with sliding blocks which are connected in a sliding way; the steel box girder and the guide beam are arranged on the assembly platform. The pushing systems are arranged in two sets and are respectively arranged on the front side and the rear side of the steel box girder, each pushing system comprises a supporting seat, two sliding rails and a pushing structure, the sliding rails are arranged at the tops of the supporting seats, the pushing structures are arranged on the sliding rails, the two sliding rails are arranged in parallel, first fixing holes are formed in the sliding rails at equal intervals, each pushing structure comprises a hydraulic jack A, a first fixing seat and a second fixing seat, the first fixing seat is arranged at the top of a first movable part of the hydraulic jack A, the second fixing seat is arranged at the tail part of a second movable part of the hydraulic jack A, second fixing holes are formed in the first fixing seat and the second fixing seat, the first fixing holes are connected with the second fixing holes through pin shafts, and a steel box girder clamping device is arranged at the front end of the; the guide deviation correcting system comprises a limiting device and a hydraulic jack A, and the limiting device is arranged on a support body of the beam falling system; the beam falling system comprises a support body, the support body is arranged on two sides of a railway line, the support body comprises a pier stud and a pier seat, the pier seat is arranged at the top of the pier stud, two jacks B are arranged on the pier seat, a first sliding block is arranged on the ejection part of the jack B, a first steel pipe is arranged on the upper part of the first sliding block, a second sliding block is further arranged on the pier seat, a second steel pipe is arranged on the second sliding block, the upper end surfaces of the first steel pipe and the second steel pipe are flush, steel box beams are arranged at the tops of the first steel pipe and the second steel pipe, steel plates are welded on the bottom surfaces and the top surfaces of the first steel pipe and the second steel pipe, and the length of the second steel pipe is larger than that of the first steel pipe; channel steel is welded between the first steel pipe and the second steel pipe; the first sliding block and the second sliding block are block sliding blocks which are arranged in an overlapped mode, and the thickness of each sliding block is 100 mm; limiting columns are arranged on two sides of the pier base, and the steel box girder is located between the limiting columns.

Further, the steel box girder is set to a simply supported steel box girder structure and comprises a top plate, a web plate and a bottom plate, wherein the top plate and the web plate are arranged in parallel, the web plate is arranged between the top plate and the web plate, the top plate, the web plate and the bottom plate are provided with longitudinal stiffening ribs, and the web plate is provided with vertical stiffening ribs.

Furthermore, a wedge-shaped cushion block is arranged on the bottom plate of the steel box girder at the steel box girder support.

Furthermore, the guide beam is longitudinally arranged into sections, the height of the root of the guide beam is correspondingly consistent with that of the steel box beam, the olecranon is arranged at the upper part of the front end of the beam, and jacks are respectively arranged below the left olecranon and the right olecranon of the guide beam.

Furthermore, the guiding and deviation correcting system further comprises a beam falling oil cylinder and two horizontal oil cylinders, wherein the beam falling oil cylinder and the two horizontal oil cylinders form a three-dimensional oil cylinder and are arranged at the bottom of the steel beam.

Compared with the prior art, the beneficial effects of the utility model are that:

this device can effectually be dragged the bridge that spanes the railway line, and the effectual current problem of the bridge construction difficulty that spanes the railway line of having solved, it is fast to drag, and the action is continuous, and construction period is shorter, and it is comparatively convenient to rectify a deviation, and factor of safety is high.

Drawings

Fig. 1 is a top view of the present invention.

Fig. 2 is a side view of the present invention.

Fig. 3 is a schematic view of the structure of the pushing device of the present invention.

Fig. 4 is a schematic view of the bracket structure of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The specific embodiment is as follows:

as shown in the drawing device for the construction of the bridge crossing the railway line, the wool grassland bridge adopts a 60m simply supported steel box girder A5 to cross the branch line of the Dongchuan railway in a left-right amplitude division design, and the width of each bridge deck is 12.25 m. The left bridge spans the east-chuan railway K57+461, the intersection angle of the left bridge and the railway is 33 degrees, and the clearance from the bottom surface of the steel box girder A5 to the rail surface of the railway is 11.45 m; the right bridge spans at the K57+431 position of the east-Sichuan railway, the intersection angle of the right bridge and the railway is 39 degrees, and the clearance between the bottom surface of the steel box girder A5 and the rail surface of the railway is 11.75 m. The longitudinal slope of the bridge at the position of the upper cross railway is-2.7 percent.

The steel box girder A5 is pushed for construction: firstly, constructing a foundation and a pier stud of an adjacent bridge, and arranging a temporary pier between a Z10# pier and a Z11# pier (a Y5# pier and a Y6# pier); an assembly platform A3 is arranged at the top of a T beam erected between a Z11# pier and a Z12# pier (Y6 # pier and Y7# pier) and between a Z12# pier and a Z14# pier (Y7 # pier and Y9# pier), a steel box girder A5 and a guide girder A4 are assembled on an assembly platform A3, after the assembly is completed, a method of dragging by a front automatic continuous pushing jack A4 and pushing by a rear continuous jack A4 is adopted for construction, the total pushing length is 89m, and the single-amplitude pushing weight is 472.1 tons.

In the construction process, a dragging and pushing method is adopted for construction, and the construction method specifically comprises the following steps:

1. drag construction

This top pushes away adopts single-point to pull the top to push the construction, and this scheme has mainly designed top pushing system (top pushing equipment), direction rectifying system, the roof beam system that falls (roof beam equipment that falls) three major parts.

The automatic continuous pushing system consists of three parts, namely an automatic continuous traction jack, a hydraulic pump station and a computer control system, and is configured with corresponding steel stranded wires as flexible pull rods to form a complete automatic continuous traction system. In particular, the method comprises the following steps of,

the two pushing systems are arranged and are respectively arranged on the front side and the rear side of the steel box girder A5, each pushing system comprises a supporting seat 1, a sliding rail 2 and a pushing structure, the sliding rails 2 are arranged at the top of the supporting seat 1, the pushing structures are arranged on the sliding rails 2, the two sliding rails 2 are arranged in parallel, first fixing holes 3 are formed in the sliding rails 2 at equal intervals, each pushing structure comprises a hydraulic jack A4, a first fixing seat 5 and a second fixing seat 6, the first fixing seat 5 is arranged at the top of a first movable part of the hydraulic jack A4, the second fixing seat 6 is arranged at the tail of a second movable part of the hydraulic jack A4, second fixing holes are formed in the first fixing seat 5 and the second fixing seat 6, the first fixing holes 3 are connected with the second fixing holes through pin shafts, and a steel box girder A5 clamping device is arranged at the front end of the first fixing seat 5; the guiding deviation correcting system comprises a limiting device and a hydraulic jack A4, and the limiting device is arranged on a support body of the beam falling system. The jacks A4 are automatically and continuously pushed by ZLD100, two jacks A4 are connected in series, a plurality of phi 15.24 force transmission steel strands are clamped by the anchors, anchor buckling points are welded below a steel beam bottom plate, one jack A4 is used for pushing, the other jack is used for returning and resetting, when the previous pushing stroke is close to the place, the other jack is in a working state, and relay reciprocating circulation is performed alternately, so that continuous pushing operation of the steel box beam A5 is realized.

The steel box girder A5 is pushed upwards from the direction of the big mileage of the highway to the direction of the small mileage, the left and right widths of the highway bridge are pushed in a split manner, the left width is pushed first, and then the right width is pushed. And during each pushing process, firstly arranging a dragging type pushing system on the top of the L2# temporary pier, arranging the dragging type pushing system on the L3# temporary pier after the temporary pier advances for a section, and dragging the beam body to a proper position.

Incremental launching construction

The pushing method is step-pitch pushing in single-point pushing, namely two hydraulic jacks A4 are arranged at the tail of a steel box girder A5 to be pushed, a slide way is manufactured according to the stroke of a pushing jack A4, the position of an opening in the slide way is arranged, after the assembly welding of the steel box girder A5 is completed, a pin is adopted to fix a jack 4 and the slide way, a jack A4 and a steel box girder A5 are fixed, then the jack A4 pushes the steel box girder A5 forward for a stroke, then an oil cylinder of the jack A4 is retracted, a jack A4 is fixed again, a stroke is pushed forward, and the steps are repeated in a circulating manner until the steel box girder A5 is pushed in place.

Advantages and disadvantages of Tuo-Lao construction

The support pulling method has the advantages that the construction has great advantages when the bridge flat curve is located on a straight line, the dragging speed is high, the action is continuous, the construction period is short, and the support pulling method has great advantages when the construction period is tight. However, when the bridge curve is constructed on the curve by the pulling method, the deviation rectification is difficult in the process.

The advantages and disadvantages of the construction by the pushing method

The construction speed of the pushing method is lower than that of the pulling method, but the pushing method is easy to correct when the bridge is positioned on a curve, and the correction is convenient in the pushing method construction process due to the low speed, and the safety factor is high.

Because the engineering steel box girder A5 (left and right) spans a railway line, and because of the reason of entering a road, the steel box girder A5 can only be decomposed into plate units to be transported to a site for erection, a pushing temporary support and a steel box girder A5 assembling jig are erected on the upper part of an erected T girder on one side of a railway of a construction site, the steel box girder A5 of the whole span 60 meters is completely assembled, and the whole pushing is in place. Because the engineering strides over a railway line, skylight points need to be declared according to the management regulations of railway departments during construction above the railway, construction in the skylight points needs to be strictly followed during construction, and the limiting factors are more.

The construction is carried out by adopting a pushing and dragging construction method, and the rear-mounted jacking jack A4 has a larger difference (see the second item for details) in equipment model and principle with the front-mounted dragging jack A4, and the strokes of the two jacks A4 are different (each stroke of the front-mounted dragging jack A4 is 250mm, and each stroke of the rear-mounted jack A4 is 1000 mm), so that the scheme is important for ensuring the normal synchronous operation of the two sets of equipment. To solve the problem, a method of laterally installing a scale on a rear jack A4 is adopted for coordination, and the length of the scale is 1 meter. After the pushing preparation work is finished, pushing operation starting instructions are issued by pushing responsible persons in a unified mode, two sets of equipment operators start the jacks A4 simultaneously, an inspector checking scale is arranged at the position of the rear-mounted jack A4, when the stroke reaches 250mm, the inspector directly issues a stopping instruction, the two jacks A4 stop simultaneously, when the stroke of withdrawing the dragging jack A4 can be dragged by the next stroke, the pushing operation is performed again according to the steps, the steps are circulated for 4 times in sequence, at the moment, the stroke of the rear-mounted jack A4 is finished, the operation is stopped, the stroke of withdrawing the rear-mounted jack A4 is repeated. Each large stroke is 1 meter, the small stroke is 0.25 meter, and the large stroke comprises 4 small strokes, so that the synchronization problem of the two sets of pushing equipment is well solved, and the feasibility of the scheme is ensured.

In the concrete construction process:

1. the steel box girder A5 structure crosses the branch line of the east-chuan railway on the bridge, and adopts a 60m simply-supported steel box girder A5 structure, the height of the girder is 2.6m, the material of steel (Hunan Steel, a steel plate manufacturer) is Q345qc, the orthotropic bridge deck plate is 16-18mm thick at the top plate, 18-20mm thick at the bottom plate, longitudinal stiffening is arranged on the top plate, the web plate and the bottom plate, and vertical stiffening is arranged on the web plate. The steel box girder A5 is an all-welded steel structure. The bottom plate of the steel box girder A5 at the support is provided with a wedge-shaped cushion block to adjust the longitudinal and transverse slopes, so that the support is horizontally arranged. The transverse partition plate at the longitudinal bridge to the fulcrum must ensure the plumb bob, and the section at the longitudinal bridge to the expansion joint keeps the plumb bob.

The cross section of the beam body mainly adopts a single-box double-chamber cross section, the top plate and the bottom plate are arranged in parallel, the top plate is provided with 2.4-4% of one-way transverse slopes, and the side web plate adopts a vertical web plate. The height of the steel box girder A5 at the central line is 2.6m, the total width of the top surface of the girder is 12m, and the total width of the bottom surface of the whole girder is 8.06 m. The steel box girder A5 has a cantilever length of 2 m. The longitudinal slope of the main beam is-2.7 percent. The camber line is a quadratic parabola formed by superposing the camber (the camber of the steel box girder A5 is 150 mm) and a structural vertical curve given in the figure. The steel structure of the engineering main body adopts Q345 qC.

2. Aiming at the engineering of Gongshan pivot wool grassland bridge steel box girder A5, the scheme mainly comprises a supporting system (supporting system), a guide girder A4 system, a pushing system, a girder falling system and a guiding and deviation correcting system according to the actual design.

(1) Stent system

The vertical columns of the temporary buttresses A2L2# and L3# adopt steel pipe columns which are 820 x 10mm in length, the weight of each steel pipe column is 3.9t, and the maximum length is 19.1m (3.0 m of embedded pile foundation); the pier L1# stand adopts in 630 × 10mm steel-pipe column, single maximum weight 4.1T, single length 26.6m, pier L2#, L3# pier stand is according to its hoist and mount weight and hoist and mount height, plans to adopt 25T crane installation, pier L1# stand adopts KLB6T-15C model diesel pile driver to squeeze into, if squeeze into the degree of depth and can not satisfy the design depth requirement, then change into the bored pile and construct according to L2 pile foundation form. And each standard length of the steel pipe pile is 9m, and the steel pipe pile is welded after blanking according to the designed length.

And after the construction of the temporary pier upright post is finished, the beam, the slideway girder A6 and the slideway girder A7A 7A7 are sequentially finished from bottom to top. The beam of the A-type buttress is 2HN 1000X 300X 5300 section steel, and the beam of the B-type buttress is 2HN 700X 300X 5300 section steel; the A-type buttress slide way girder A6 is 4HN 900X 300X 5400 steel section, and the B-type buttress slide way girder A6 is 4HN 600X 200X 5300 steel section. The section steel flange plates are butt-welded by adopting grooves, the welded section steel flange plates are ground flat, double-sided angle welding is adopted between the cross beam and other members and between the cross beam and the steel pipe column, the height hf of the welding line is =10mm, and equal-strength butt welding is adopted during lengthening.

(2) Guide beam A4 system

2 groups of guide beams A4 are manufactured by the guide beam A4, the total weight of each set of steel guide beam A4 of the single bridge is about 40.8t, each guide beam A4 consists of 2 high-height I-shaped solid web steel plate main beams, the transverse center distance is 7.986M, the longitudinal length of each guide beam A4 is 24M, in order to facilitate transportation and assembly, the 24M long guide beam A4 is longitudinally divided into 3 sections (M1 is 6.77t in weight, M2 is 5t in weight, M3 is 3.89t in weight) according to the drawing requirements and is symmetrically processed, and the height of the root part of each guide beam A4 is correspondingly consistent with that of a steel box girder A5 (2.6M). In order to facilitate the guide beam A4 to pass through the front pier, the eagle beak with the length of 400mm and the height of 605mm is arranged at the upper part of the front end of the guide beam A4. When the lower opening of the front end of the guide beam A4 reaches the front pier, the olecranon at the upper part of the front end of the guide beam A4 is positioned on the pier. 1 jack 200t is respectively arranged below the left olecranon and the right olecranon of the guide beam A4, the front end of the guide beam A4 is lifted to be higher than the pier top, and meanwhile, the box girder continues to be jacked forwards. When the lower opening at the front end of the guide beam A4 enters the slideway for at least 5cm, the lifting jack can be detached. The two guide beams A4 are transversely connected by round steel tubes, so that the whole guide beam A4 is formed into a whole.

(3) Pushing system

3.1 towing System

The automatic continuous pushing system consists of an automatic continuous traction jack A4, a hydraulic pump station and a computer control system, and a corresponding steel strand is configured as a flexible pull rod to form a complete automatic continuous traction system. The jacks A4 adopt ZLD100 to automatically and continuously push the jacks A4, two jacks A4 are connected in series, an anchor clamps a plurality of phi 15.24 force transmission steel strands, an anchor buckling point is welded below a steel beam bottom plate, one jack A4 pushes, the other jack returns, when the previous pushing stroke is close to the place, the other jack is in a working state, and alternating relay reciprocating circulation is carried out, so that continuous pushing operation of the steel box beam A5 is realized.

3.2 Pushing System

The pushing method is step-pitch pushing in single-point pushing, namely two hydraulic jacks A4 are arranged at the tail of a steel box girder A5 to be pushed, a slide way is manufactured according to the stroke of a pushing jack A4, the position of an opening in the slide way is arranged, after the assembly welding of the steel box girder A5 is completed, a pin is adopted to fix the jack A4 and the slide way, fix the jack A4 and the steel box girder A5, then the jack A4 pushes the steel box girder A5 forward for a stroke, then the jack A4 oil cylinder is retracted, the jack is fixed again, a stroke is pushed forward, the operation is repeated in a circulating mode until the steel box girder A5 is pushed in place, and then the steel box girder A5 is dropped onto a support through a common jacking jack, so that the whole engineering construction is completed.

(4) Beam falling system

The steel box girder A5 adopts 4 500t jacks B23, the jacks B23 are respectively arranged at two ends (two jacks at each end) of the steel box girder A5, simultaneously, the steel pipes and the sliding blocks are used for cushion lifting, and the height of the girder falling each time is determined according to the stroke of the jack B23 and the height of the cushion lifting sliding blocks, and is generally 100 mm/time. Specifically, the beam falling system comprises a support body, the support body is arranged on two sides of a railway line, the support body comprises a pier stud 21 and a pier seat 22, the pier seat 22 is arranged on the top of the pier stud 21, two jacks B23 are arranged on the pier seat 22, a first sliding block 24 is arranged on an ejection part of the jack B23, a first steel pipe 26 is arranged on the upper part of the first sliding block 24, a second sliding block 29 is further arranged on the pier seat 22, a second steel pipe 210 is arranged on the second sliding block 29, the upper end faces of the first steel pipe 26 and the second steel pipe 210 are flush, steel box beams A5 are arranged on the tops of the first steel pipe 26 and the second steel pipe 210, steel plates 25 are welded on the bottom faces and the top faces of the first steel pipe 26 and the second steel pipe 210, and the length of the second steel pipe 210 is greater than that of the first steel pipe 26; a channel steel 27 is welded between the first steel pipe 26 and the second steel pipe 210; the first sliding block 24 and the second sliding block 29 are 6 sliding blocks which are arranged in an overlapping mode, and the thickness of each sliding block is 100 mm; limiting columns 211 are arranged on two sides of the pier seat 22, and the steel box girder A5 is located between the limiting columns 211. The permanent pier support is provided with a No. 2 support, the bottom of the permanent pier support is provided with 6 100mm high sliding blocks, phi 630 steel pipes are arranged above the sliding blocks, 2cm steel plates are arranged between the steel pipes and the sliding blocks, the steel plates, the sliding blocks and the steel pipes are all connected in a welding mode, the upper portions of the steel pipes are also provided with 2cm thick steel plates, and the steel plates, the bottom of a box girder and the steel pipes are all connected in a welding mode. Set up the 1# at the 2# support inboard and support, 500t roof beam jack B23 that falls is placed to the bottom, 6 high sliders of 100mm are placed on jack B23 upper portion, the phi 630 steel pipe is placed to the slider top, place the 2cm steel sheet between steel pipe and slider, all adopt welded connection between steel sheet and slider and the steel pipe, steel pipe upper portion also sets up the 2cm steel sheet, steel sheet and bottom of the case roof beam and steel pipe all adopt welded connection. And lifting the jack B23 for 20mm, then drawing out the slide block at the bottom of the No. 2 support, at the moment, retracting the jack B23 for 120mm, actually dropping the beam for 100mm, and repeating the steps for 6 times, and actually dropping the beam for 600 mm.

(5) Deviation rectifying system

Measure 1: in the pushing construction process, measurement is carried out at any time, and if the deviation of the steel box girder A5 is found and exceeds an early warning value, the deviation of the steel box girder A5 is controlled by controlling the jacking speeds of the two rear-mounted jacking jacks. For example, by measuring, if the steel box girder a5 is shifted 50mm to the left, the valve can be adjusted to reduce the speed of the right jack, so that the steel box girder a5 can be shifted to the right until reaching the design track.

And 2, measure 2: when the beam is about to be in place, if deviation exists, the beam falling oil cylinder (ZLD 200-30) and the two horizontal oil cylinders form a simple three-dimensional oil cylinder, and the position deviation of the steel beam is adjusted.

And (4) measure 3: in order to prevent linear deviation, a limiting device is arranged on the temporary support to avoid large deviation of the steel box girder A5 in the pushing process.

In the construction process, the pushing construction is serious and difficult

1. The pushing process of the steel box girder A5 is a process of continuously converting a structural system, and is a curved bridge, so that the stress of a girder body is complex;

2. in the pushing process, the pushing rod not only disturbs up and down, but also twists in a plane, the linear control is particularly difficult, and the deformation control of the beam body is also particularly important;

3. because the box girder and the guide girder A4 change linearly and constantly in the pushing process, the stress of the temporary steel pipe buttress caused by the change also changes constantly, and the stress must be paid attention to constantly;

4. in order to guarantee the construction period and the quality, the construction method combining dragging and pushing is adopted in the project, when the two work methods are used simultaneously, the mutual matching needs to be paid attention, and the operation procedure needs to be strictly followed.

Control measure in incremental launching construction

(1) Principle of pushing erection

1) When the steel box girder A5 is assembled on the assembly support, the assembly camber curve of the steel box girder A5 is particularly noticed except that the support is ensured to have enough bearing capacity and reserved compression sinking amount.

2) During the installation process of the steel box girder A5, the movable support saddle can move greatly along the axle direction due to temperature change and the fulcrum lifting jack A4. When the beam body falls on the formal movable support, the displacement of the beam body may exceed the designed maximum allowable offset, so that the beam body is prevented from moving when pressure exists between the beam body and the support in construction, and when the beam body moves longitudinally and transversely, the beam body is separated from the support and then moves, is adjusted to the correct position and then falls on the support.

(2) Longitudinal pushing operation

1) The whole slideway is arranged according to a design assembling line type, the designed flatness, axis and elevation requirements are met, and the splicing part is in round and smooth transition. The quality requirements are as follows: the difference between the front elevation and the rear elevation of the single-piece slideway beam A7 slideway beam A7A7 is within +/-5 mm; the elevation difference between the two slide way beams A7 and A7A7 is within +/-2 mm; the slideway cannot have a dead bend longitudinally;

2) ensuring that the jack A4 equipment is normal, horizontally pushing the connection quality of the jack A4 and the steel box girder A5, the welding quality of the counter force seat of the jack A4 and the connection quality of the counter force seat and the slideway girder A7A7 of the slideway girder A7;

3) each set of continuous jack A4 is respectively provided with two sets of external absolute value encoders for respectively detecting the absolute stroke of the front jack and the rear jack of each jack A4 and the control feedback of the jack A4;

4) the left side and the right side of the steel box girder A5 are respectively provided with a length measuring rope, and each length measuring rope drives a set of absolute value encoder for measuring the displacement of the two sides of the steel box girder A5;

5) in the early stage of pushing, the friction coefficient is calculated and used for adjusting the theoretical control pushing force in the whole pushing process;

6) tracking and monitoring are carried out in the pushing process, the parallel pushing of the jacks A4 on two sides is guaranteed, the pushing speed and the pushing amount are kept synchronous, fault diagnosis and detection are carried out in time, and the pushing operation is stopped when a large deviation occurs, so that fault removal is carried out. The oil pumps are connected in parallel to ensure that the jacks A4 are synchronous, scale marks are made on the longitudinal movement slide rail at intervals of 5cm, and the synchronization is strictly controlled;

7) the technical measures of synchronously mounting the pier on the guide beam A4 and the steel box girder A5 are as follows: according to the design of the main pier temporary buttress A2, two temporary piers and sliding blocks under a guide beam A4 (under a web plate in a steel box beam A5) are arranged along the cross section direction of a steel box beam A5 bridge, when the sliding blocks are arranged on the guide beam A4, an upward jacking force is exerted by using a temporary jack A4 arranged at the front end of the guide beam A4, and after the front end of the guide beam A4 is prevented from being downwarped, the two guide beams A4 can be synchronously butted.

(3) Deviation correction in pushing process

1) The steel box girder A5 two-point synchronous continuous horizontal pushing system consists of a hydraulic pump station, a continuous jack A4 and a computer automatic control system, and has the functions of synchronous two-side, single-side single-action, single-point single-action and inching limiting. The purpose of correcting the deviation is achieved by adjusting different strokes of two groups of jacks A4 of the hydraulic oil cylinder, wherein one group of jacks A4 has more strokes, and the other group pauses. Adjusting and then pushing simultaneously;

2) the weight of the steel box girder A5 arranged on the pier top is transmitted to the main pier or the pile foundation thereof by the temporary buttress A2 and the pier-side bracket in the pushing operation process to bear, the main pier, the bearing platform and the pile foundation are all subjected to calculation and rechecking, and the structural rigidity of the main pier, the bearing platform and the pile foundation meets the horizontal thrust and the vertical pressure in the pushing process;

3) after the pushing operation is finished, utilizing a steel cushion block, a polytetrafluoroethylene plate and a vertical jack arranged on the pier top to drop a beam, utilizing a horizontal jack to adjust the transverse displacement, finishing the system conversion, and installing a formal pier top support;

4) the deviation rectifying wheels arranged on the two sides of the steel box girder A5 and the guide girder A4 are provided with left and right adjustable screw threads, if the deviation of the steel box girder A5 is found to be large in the pushing process, the linearity of the steel box girder A5 can be adjusted by adopting the mode of adjusting the screw threads.

(4) Roof beam

1) And after the pushing operation is finished and the steel box girder A5 reaches the pier position, if the transverse deviation of the steel box girder A5 is large, the steel box girder A5 can be transversely moved and adjusted in place before jacking. The final positioning longitudinal movement of the steel box girder A5 can be adjusted by temperature difference. Before the steel box girder A5 is transversely moved and adjusted to be deviated, all sections must be welded completely to prevent the steel box girder A5 from being influenced by transverse horizontal force to cause the axis of the steel box girder A5 to be bent. Monitoring the plane position of the chord member after the assembly of each internode is completed, and adjusting when the plane position exceeds a specified value;

2) the pier top arrangement is designed by taking the state of reaching the previous pier as a main working condition, and comprises two contents, namely the design of a temporary fulcrum of a steel box girder A5 and the design of a displacement adjusting system;

the displacement adjusting system is that a jack and a top seat are arranged under the jacking point of the steel box girder A5. The jack is divided into a vertical jack and a horizontal jack, and the operations of jacking and lowering the beam and moving longitudinally and transversely are respectively carried out. Because the steel box girder A5 span is big, easily produce great longitudinal displacement under the temperature difference effect, need arrange the polytetrafluoroethylene board and stainless steel plate friction pair below vertical jack and make the glide plane. When the steel box girder A5 is longitudinally and transversely moved, the steel box girder A5 is placed on the pier top temporary support to slide, and a tetrafluoroethylene plate is used as a sliding surface;

3) according to the steel box girder A5 structure, the jacking point acts on the support or the slide way, firstly the support point jacks the emptying slide way, the slide way is replaced by the girder falling jack, and then the height of the other slide way and the height of the base plate at the support are gradually reduced to achieve the purpose of girder falling. When lifting and dropping the beam, in order to ensure safety, the elastic deformation of the steel box beam A5 is utilized, only one pier top fulcrum is lifted and dropped at a time, the beam is lifted and dropped one by one, the beam is synchronously lifted and dropped with the pier top fulcrum, and the height of the beam dropped each time is controlled to be about 180 mm;

4) and a jack, an I-steel group cushion seat (with a horizontal flat top reaction seat), a steel cushion block, a distribution beam and the like are sequentially arranged below the lifting point of the steel box beam A5. The jack setting is determined according to the supporting requirement, the vertical jack adopts a 200t jack, and the horizontal jack adopts a 100t jack;

5) and multiple jacks under combined action are of the same type and are connected in parallel by oil pipes. The lengths of the oil jack, the oil pump, the pressure gauge and the oil pipe are required to be consistent. In order to accurately master the fulcrum counter force, the jack, the oil pump and the pressure gauge are matched and corrected together;

6) in the top-falling beam, asbestos board anti-skid materials are placed between the upper supporting surface and each cushion layer; in order to adapt to the horizontal displacement of the fulcrum, the bottom of the jack is provided with a tetrafluoroethylene plate pad seat, and the center of the pad seat is coincided with the central shaft of the jack;

7) the central shaft of the jack is coincided with the central line of the supporting structure, and the changes of the jacking elevation, the fulcrum counter-force, the fulcrum displacement, the mid-span deflection and the like are observed and recorded;

8) and a safety support is required to be arranged when the beam is jacked and dropped, and the left, the right and the middle of the same pier are synchronously lifted except for the elevation adjustment. When the device is placed on a temporary support in the process of jacking and falling the beam, the height difference of two side branches is measured, and when the height difference is larger than 3mm, the elevations of the two branches are adjusted;

9) when the beam is jacked down and longitudinally and transversely moved, an on-duty engineer is responsible for the beam jacking and longitudinally and transversely moving, and records are made, and when a plurality of jacks are used for jacking down the beam, the unified command is required, and a specially-assigned person is responsible for the beam jacking and longitudinally and transversely moving;

10) the following principles must be observed for the use of jacks:

firstly, the pump is arranged between two slideway beams A7A 7A7 as much as possible, so that the lengths of oil pipes are approximately equal;

② spindle oil is used as much as possible.

(5) The cautions of pushing operation

1) Static measurement is needed in the pushing process

During the pushing operation, the measurement of node deflection and the central line requires that each section measures deflection once and compares the calculated value every time when one section is installed, and simultaneously measures the central line once, judges the manufacturing and installing quality of the steel box girder A5, determines the longitudinal gradient, so that when the steel box girder A5 reaches a front fulcrum, enough clear height exists between the bottom of the girder and the top of the pier, and the jacking equipment is arranged conveniently. Meanwhile, considering whether the deviation correcting device is adopted to transversely move the steel box girder A5 in the next step, the displacement of each pier fulcrum should be observed and measured to be compared with the design value. Meanwhile, stress measurement is carried out on the key blocks, and the measured values are compared with calculated values so as to be analyzed in time and prevent over stress;

2) before the pushing operation, the items to be determined are as follows:

the method comprises the following steps of firstly, designing a guide beam A4 structure, designing a main bridge steel box beam A5 structure, designing specifications, blocking stress, a weight meter and the like;

secondly, arranging and checking data on the assembly platform A3 and the pier top;

thirdly, welding slag, splashes and the like on the slideway beam A7A7 stainless steel plate of the slideway beam A7 are cleaned, and the influence of dirt on friction is reduced;

fourthly, the placement position of the pier top sliding block is centered, and the pier top sliding block cannot be deviated to one side or has a large included angle with the pushing direction of the steel box girder A5 so as to prevent adverse effects on the top pushing;

fifthly, before pushing each time, checking whether the tetrafluoroethylene plate at the bottom of the sliding block is extruded and thinned so as to be replaced in time;

sixthly, coating butter on a stainless steel plate on the top surface of a slide way beam A7A7 of a slide way beam A7 to keep the slide way surface free of dust and other impurities and prevent a tetrafluoroethylene plate from being scratched to influence the use effect;

and (4) checking whether each pushing device is normal and whether each line connection is correct.

(6) Attention points of the lifting beam

1) The jack is accurately and stably arranged, and the upper and lower bearing surfaces are leveled. The central shaft of the jack is coincided with the central line of the supporting structure;

2) in order to avoid cylinder pulling, the stroke of the jack is regulated to be not larger than the effective working stroke;

3) when the beam is jacked and dropped, a safety support is required to be arranged so as to prevent timely support when an accident happens;

4) after the detection is qualified, the roof can be constructed according to the specified counter force and the roof-falling procedure;

5) jacks with the same type and number are adopted during lifting, the stress of the steel box beam A5 on the two slideway beams A7A 7A7 in the jacking process is in the same plane, and the maximum height difference is not more than 20mm, otherwise, the stress is adjusted;

(7) longitudinal and transverse movement of steel box girder A5

1) The top beam falling or longitudinal and transverse moving of the steel box beam A5 can not be carried out simultaneously with the assembly;

2) and the steel box girder A5 transversely moves: after the pushing of the steel box girder A5 is finished, the steel box girder A5 is transversely moved and adjusted to a design position, so that the steel box girder A5 is cantilevered along the center line direction. The transverse moving equipment is arranged below the top beam, an external force applying method is used for transverse moving, in view of the fact that transverse moving amount is not easy to control and the influence of things on sun bias is caused, in order to speed up progress and avoid deviation of the steel box girder A5, the jacking force equipment is symmetrically arranged on the left side and the right side, and when the transverse moving jack below one side works, the equipment below the other side plays a role in safety;

3) the longitudinal movement of the steel box girder A5 is mainly based on a lifting and landing method, namely the steel box girder A5 is deformed and the fulcrum is moved by lifting and landing, then the system is converted, reverse operation is carried out to move the steel box girder A5, and the process is repeated until the steel box girder A5 is longitudinally moved to the design position. In order to increase the friction constraint of the fixed pivot, the fixed pivot is additionally padded with an asbestos plate, so that the friction force of the fixed pivot is greater than the sum of the friction forces of all the movable supports;

(8) center line precision control of top pushing box beam

4 central line mark points are made on the top plate of each section of steel box girder A5, 3 mark points are made on the bottom plate, during pushing, a theodolite is erected on an observation tower to observe the central line of the girder, and when large deflection occurs, deviation correction is performed. And when the box girder needs to be put in place after 2m is left in the longitudinal direction, uninterrupted observation and accurate deviation correction are started, so that the deviation between the head-tail center line of the box girder and the design deviation is controlled within the range of 5 mm. And finally, controlling the deviation between the head-tail center line of the box girder and the design to be within 3mm when the box girder is in place. And when each pushing is finished, drawing a central line state diagram of the box girder, comparing the actual central line of the box girder with the designed central line of the box girder, analyzing the deviation condition of the central line of the steel box girder A5, determining a control scheme of the central line of the box girder in the next construction step, and enabling the actual central line of the box girder to swing left and right around the designed central line to avoid large arc so as to avoid influencing the normal operation of the pushing construction.

(9) Measures for ensuring smooth running, preventing local instability and controlling vertical alignment of beam body

In order to prevent the beam body from generating local instability in the pushing process, the following measures are taken:

the manufacturing precision of the slide way is improved, the elevation of the slide way is strictly controlled, and the elevation of each pier top slide way is checked before pushing construction at each time. The temporary piers are all pre-pressed, and a jack is arranged below the temporary pier A2 slide way during walking so as to adjust the elevation of the slide way at any time.

The bottom surface of the box girder must be polished smoothly, so that burrs, welding slag splashing and the like are avoided, and the phenomena that the steel box girder A5 runs unsmoothly or cannot run in the pushing process are avoided.

The front section of the box girder is provided with a steel guide girder A4 with light weight and high rigidity, the steel guide girder A4 is connected with the steel box girder A5 by high-strength bolts, and reinforcing ribs are arranged to improve the stress state of the front part of the box girder.

The assembling quality of the steel box girder A5 girder section is strictly controlled by high standards, and the flatness of the bottom of the steel box girder A5 is ensured to be improved. After the section A5 of the newly assembled steel box girder is separated from the beam splicing platform, a specially-assigned person is arranged to check the bottom of the girder, and if the bottom of the girder is not flat, measures are taken in time to treat, trim and level the bottom of the steel box girder A5.

And monitoring and measuring, strictly controlling the deflection of the beam body, and correcting the elevation of the spliced beam pedestal in time after each beam section is finished.

The slideway is checked regularly and is coated with lubricating oil to ensure that the steel box girder A5 can be smoothly pushed.

In the construction process, the following points are also provided:

1. the incremental launching construction is better for long-span bridges and places with special requirements, and the length of the segment is preferably 12-24 meters if the segmented incremental launching is adopted. The segment is too short, the construction period is prolonged, and the construction cost is not economical;

2. the incremental launching construction method is a new bridge construction technology, when the method is selected for construction, the advantages of incremental launching construction are fully paid attention to, the advantages of incremental launching construction are brought into play, otherwise, the incremental launching construction method is not economical, and generally, the incremental launching construction method is not suitable for the bridge which can be selected for construction by a hoisting method;

3. in the construction process, if unnecessary, a single construction method is adopted as much as possible;

4. the pushing construction has stricter process requirements, not only has stricter manufacturing requirements on steel beams, but also has stricter requirements on various systems of the pushing construction;

(1) pushing a counter-force support: in order to ensure the stable stress of the slideway in the pushing process and reduce downwarping, the density of the pushing counter-force support needs to be increased; in order to ensure that the pushing counter-force support can provide enough pushing counter-force and anti-overturning capacity in the pushing process, the integral connection cross brace, the cross brace and the like of the pushing counter-force support need to be strictly controlled; after the pushing reaction force support is set up, it is preferable to perform a preliminary pressing process if the conditions permit.

(2) A slideway: in order to ensure that the whole pushing construction is finished with the minimum friction force in the pushing process, special attention needs to be paid to the manufacturing of the slideway so as to ensure that the horizontal height difference of the surface of the single slideway is not more than 3 mm; the welding slag and the spatter need to be polished completely, and the defects of arc pits and the like are avoided; when the slideways are assembled on site, the height difference between the slideways is strictly controlled, the slideways are kept at the same horizontal plane as much as possible, the error is not more than 3mm, and the connection between the slideways cannot be bent; the welding quality between the slideways must be strictly controlled, and reinforcing ribs are arranged; the stainless steel plate on the upper part of the slideway plays a role in reducing friction force, and the laying of the stainless steel plate needs to be strictly controlled and needs to be tightly attached to the surface of the slideway.

(3) A slide block: the sliding block can be used by matching a tetrafluoroethylene plate with a steel sliding block, and the surface smoothness of the sliding block must be ensured in the manufacturing process; when the sliding blocks are installed on site, the sliding blocks are symmetrically installed on the two side sliding ways to ensure the stress balance of the box girder, and the sliding blocks are installed at the position of a box girder partition plate as much as possible to prevent the steel box girder A5 from deforming in the pushing process.

(4) Pushing a jack and a control box: the connection of the jacking jack and the slideway adopts a pin fixing method, the connection with the steel box girder A5 adopts a welding method, in the jacking process, the pin connected with the slideway must be inserted in place, and the welding quality of the jacking jack and the steel box girder A5 must be strictly controlled and monitored at any time; the control box is required to be placed at the tail of the box girder and installed in the middle of the box girder as much as possible so as to ensure that the oil pipes of the jacks at two sides are consistent in length in the pushing process and ensure that the two jacks uniformly output thrust; the operation of the jacking jack needs to be trained and then a specially-assigned person is arranged for carrying out the operation, and the operation must be forbidden.

(5) A pulling system: the dragging system is mainly divided into a dragging jack, a steel strand, a reaction seat and a rear anchor point, and the installation and welding of the reaction seat and the rear anchor point need to be ensured to be firm and can bear the reaction force generated in the dragging process; the installation of the steel strands also needs to be strictly controlled, and the stress of each steel strand needs to be uniform; the rear point steel strands must be anchored tightly.

(6) Guide beam a 4: when the guide beam A4 is manufactured, the manufacturing precision of the guide beam A4 must be ensured for strict control; the guide beam A4 and the guide beam A4 as well as the guide beam A4 and the box girder are connected in a welding mode, so that the welding quality between the sections of the guide beam A4 and between the guide beam A4 and the box girder must be ensured and monitored at any time.

(7) And (3) falling to the roof: the beam falling jack adopts a vertical hydraulic jack, when the beam falling jack is installed, the jack is required to be ensured to be stressed vertically, the bottom of the jack is fixed with the beam falling frame in the beam falling process, and the top of the jack is fixed with the bottom of the box girder; the beam falling is preferably not more than 180mm each time; the operation of the beam-falling jack needs to be trained and then a specially-assigned person is arranged to carry out the operation, and the operation must be forbidden.

5. In the pushing process, personnel at each point need to be configured with communication equipment, and need to train for delivery before going on duty, so as to ensure that all personnel can clearly specify each instruction and must forbid the instruction;

6. in the pushing construction process, monitoring and measuring are important work, and the pushing distance, the offset distance and the like of the box girder need to be monitored at any time so as to be adjusted in time.

Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general throughout the application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims (6)

1. The utility model provides a span bridge construction of railway line is with dragging device which characterized in that: the device comprises a support system, a pushing system and a guiding and rectifying system, wherein the support system comprises a fixed buttress (A1), a temporary buttress (A2), an assembling platform (A3) and a guide beam (A4); the temporary buttresses (A2) are fixedly arranged on the ground and arranged on one side of the fixed buttresses (A1), 2 splicing platforms (A3) are arranged, one splicing platform (A3) is arranged between the temporary buttresses (A2) on the pushing side, the other splicing platform is arranged at the top of the erected T-shaped beam (B1), a slideway girder (A6) is arranged on each splicing platform, the slideway girder (A6) is vertically provided with the slideway girder (A7), and a slideway is arranged on the slideway girder (A7); the guide beams are symmetrically arranged into 2 groups, the guide beams are arranged at the front end of the steel box girder (A5), and the bottom parts of the guide beams and the steel box girder (A5) are provided with slide blocks which are connected in a slide way in a sliding way; the steel box girder (A5) and the guide beam (A4) are arranged on the splicing platform.

2. The towing device for bridge construction across a railway line as claimed in claim 1, wherein: the pushing systems are arranged in two sets and are respectively arranged on the front side and the rear side of the steel box girder (A5), each pushing system comprises a supporting seat (1), a sliding rail (2) and a pushing structure, the sliding rails (2) are arranged on the tops of the supporting seats (1), the pushing structures are arranged on the sliding rails (2), the sliding rails (2) are arranged in parallel, first fixing holes (3) are formed in the sliding rails (2) at equal intervals, each pushing structure comprises a hydraulic jack A (4), a first fixing seat (5) and a second fixing seat (6), the first fixing seat (5) is arranged on the top of a first movable part of the hydraulic jack A (4), the second fixing seat (6) is arranged at the tail part of a second movable part of the hydraulic jack A (4), second fixing holes are formed in the first fixing seat (5) and the second fixing seat (6), and the first fixing holes (3) are connected with the second fixing holes through pin shafts, the front end of the first fixed seat (5) is provided with a steel box girder clamping device; the guide deviation rectifying system comprises a limiting device and a hydraulic jack A (4), and the limiting device is arranged on a support body of the beam falling system; the beam falling system comprises a support body, the support body is arranged on two sides of a railway line and comprises a pier stud (21) and a pier seat (22), the pier seat (22) is arranged at the top of the pier stud (21), two jacks B (23) are arranged on the pier seat (22), a first sliding block (24) is arranged on the ejection part of the jack B (23), a first steel pipe (26) is arranged at the upper part of the first sliding block (24), a second sliding block (29) is also arranged on the pier seat (22), a second steel pipe (210) is arranged on the second sliding block (29), the upper end surfaces of the first steel pipe (26) and the second steel pipe (210) are flush, and the top parts of the first steel pipe (26) and the second steel pipe (210) are provided with steel box girders (A5), the bottom surfaces and the top surfaces of the first steel pipe (26) and the second steel pipe (210) are respectively welded with a steel plate (25), the length of the second steel pipe (210) is greater than that of the first steel pipe (26); a channel steel (27) is welded between the first steel pipe (26) and the second steel pipe (210); the first sliding block (24) and the second sliding block (29) are 6 sliding blocks which are arranged in an overlapping mode, and the thickness of each sliding block is 100 mm; limiting columns (211) are arranged on two sides of the pier seat (22), and the steel box girder (A5) is located between the limiting columns (211).

3. The towing device for bridge construction across a railway line as claimed in claim 1, wherein: steel box girder (A5) sets up to simple steel box girder structure, including roof, web, bottom plate, roof and web parallel arrangement, and the web setting is equipped with vertical stiffening at roof, web, bottom plate between the two, and vertical stiffening is established to the web.

4. The towing device for bridge construction across a railway line as claimed in claim 1, wherein: and a wedge-shaped cushion block is arranged on the bottom plate of the steel box girder at the steel box girder support.

5. The towing device for bridge construction across a railway line as claimed in claim 1, wherein: the pilot beam is longitudinally arranged into 3 sections, the height of the root of the pilot beam is correspondingly consistent with that of the steel box girder (A5), the olecranon is arranged at the upper part of the front end of the girder, and jacks are respectively arranged below the left olecranon and the right olecranon of the pilot beam.

6. The towing device for bridge construction across a railway line as claimed in claim 1, wherein: the guiding deviation correcting system further comprises a beam falling oil cylinder and two horizontal oil cylinders, wherein the beam falling oil cylinder and the two horizontal oil cylinders form a three-dimensional oil cylinder and are arranged at the bottom of the steel beam.

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