CN110820602A - A single-segment box girder bridge erecting machine and its operation method - Google Patents

Abstract

The invention discloses a single-segment box girder bridge erection machine and an operation method thereof, which solves the erection problem of a single-segment box girder during the bridge erection process, and the support frame attached to the pier in front of the front leg pier of the bridge erector is lightweight And it is safe and reliable, and can be disassembled and assembled quickly and transferred, which solves the problem that the current operating platform is inconvenient for wet joint construction and beam bottom decoration. It includes a cover beam and a base, the outer side of the cover beam is fixedly installed with the main beam of the bridge erection machine, the upper end of the main beam of the bridge erection machine is fixedly connected with a support beam, and the upper end of the support beam is fixedly connected with a guide beam, the The upper end of the guide beam is fixedly installed with the crane crane, the lower end of the guide beam is fixedly connected with the front auxiliary leg, the lower end of the guide beam is fixedly connected with the middle support leg, and the lower end of the guide beam is fixedly connected with the rear auxiliary leg A connecting beam is fixedly installed at the lower end of the middle support leg, and a single segment box beam is installed at the lower end of the connecting beam.

Description

A single-segment box girder bridge erecting machine and its operation method

technical field

The invention relates to a single-section box girder bridge erecting machine, in particular to a single-segment box girder bridge erecting machine and an operation method thereof.

Background technique

The bridge erection machine is a device that places the prefabricated beams on the prefabricated piers. The bridge erection machine belongs to the category of cranes, because its main function is to lift the beam pieces, then transport them to the position and put them down. A bridge erecting machine is very different from a crane in the general sense. The required conditions are harsh, and there is running on the beam, or longitudinal movement.

Bridge construction machinery that runs on roads and railway tracks and is used to erect small-span beams across the entire span. Because of its high efficiency of bridging, in the standard design of railway bridges in China, it is often considered as the design principle. Its fuselage is huge and exceeds the limit of railway transportation. It must be disassembled and transported. After arriving at the construction site, it will be assembled and used. There are three kinds of bridge erection machines in China, which are mostly used to erect steel bars or prestressed concrete beams in pieces. The specified height on both sides of the longitudinal running track of the bridge erecting machine is required to correspond to the level and keep it stable. The horizontal running rails of the front, middle and rear outriggers are required to be level, and the spacing is strictly controlled, and the three rails must be parallel. The bridge erecting machine is also equipped with hydraulic system, electrical system, diesel generator set and safety protection monitoring system.

Bridge erection machine is divided into erecting highway bridges, conventional railway bridges, passenger railway bridges and so on. When the bridge erecting machine erects a single segment box girder, the current method is relatively cumbersome, and the equipment support frame has a large self-weight, which is inconvenient for quick disassembly and transition. Moreover, the operation platform is inconvenient for wet joint construction and beam bottom decoration. Therefore, there is a need for improvements to the prior art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a single-segment box girder bridge erection machine and an operation method thereof, which solves the erection problem of a single-segment box girder during the bridge erection process, and the front outrigger pier is supported by the front pier. The frame is light, safe and reliable, and can be quickly disassembled and transferred, which solves the problems that the current operating platform is inconvenient for wet joint construction and beam bottom decoration.

The object of the present invention can be realized through the following technical solutions:

A single-segment box girder bridge erection machine comprises a cover beam and a base, a main beam of the bridge erection machine is fixedly installed on the outer side of the cover beam, and a support beam is fixedly connected to the upper end of the main beam of the bridge erection machine. The upper end of the support beam is fixedly connected with a guide beam, the upper end of the guide beam is fixedly installed with a crane, the lower end of the guide beam is fixedly connected with a front auxiliary leg, and the lower end of the guide beam is fixedly connected with a middle leg , the lower end of the guide beam is fixedly connected with a rear auxiliary leg, the lower end of the middle leg is fixedly installed with a connecting beam, and the lower end of the connecting beam is installed with a single segment box beam;

The base is fixedly connected to the ground, the upper end of the base is fixedly connected with a support seat, the upper end of the support base is fixedly connected with a steel support column, the upper end of the support column is fixedly connected with an I-beam support, and the I-shaped steel support is fixedly connected to the upper end of the support column. The upper end of the steel support is fixedly connected with an adjusting sand barrel, and the upper end of the adjusting sand barrel is fixedly connected with an adjusting wedge, and the adjusting wedge is in contact with the bottom of the cantilever of the cover beam.

Preferably, a support tie rod is installed in the middle of the steel support column through bolts, and the support tie rod and the cover beam are fastened with bolts.

Preferably, the adjusting wedge is composed of two wedges and a pull rod, and nuts are installed on both sides of the pull rod.

Preferably, the support seat, the support column and the I-beam support are of welded structures.

Preferably, the guide beam is in the form of a rectangular truss structure, the chord is an I-beam formed by tailor-welding steel plates, and the web is a box-shaped member formed by double-buckling channel steel.

Preferably, the middle outriggers are provided with oil cylinders for lifting, lateral movement and longitudinal movement.

A method for operating a single-segment box girder bridge erecting machine, the specific steps comprising:

Step 1: Construction of the lower structure, after the completion of the lower structure, the top block of the middle fulcrum pier is hoisted by the bridge erection machine and temporarily fixed;

Step 2: Hoist the first span box girder, adjust the position of the box girder segment, and carry out pre-assembly;

Step 3: Apply adhesive on the matching surfaces of the first two box girders, match and position the two box girders, apply temporary prestress to squeeze and tighten, and repeat the above steps to assemble to No. 11 block;

Step 4: Install the wet joint formwork, pour the wet joint and maintain it, use the crane to hoist the top block of the advanced pier, and anchor it well;

Step 5: When the wet joints are poured concrete reaches %, the external prestress is symmetrically tensioned in batches. After the tension is completed, the whole machine is unloaded, the hanging is removed, and it is transported and hung to the ground;

Step 6: After the overhead crane is used to carry out the reverse transportation by leaps and bounds, the outriggers in the pier are moved to the leading pier and anchored well;

Step 7: The bridge erection machine moves forward longitudinally, the crane is located in front of the main frame as a counterweight, and the bridge erection machine is moved longitudinally in place and the posture of the bridge erection machine is adjusted;

Step 8: Assemble the mid-span main beams in the order of the first span, and pour the wet joints;

Step 9: When the concrete strength reaches %, the mid-span prestress is symmetrically tensioned in batches;

Step 10: construct the main beam of the tail span, and tension the prestressed steel bundle with negative bending moment after completion;

Step 11: Bridge deck paving and installation of ancillary facilities.

The beneficial effects of the present invention are as follows: this scheme adopts the segmental assembly bridge erection machine for single-width whole-hole suspension assembly and erection, and then traverses to complete another whole-hole suspension, assembly and erection, and longitudinally moves to a new span-by-span after the completion of double-width whole-hole construction Complete erection.

The bridge erecting machine adopts the walking type, which can move through the holes by itself. The outriggers are reversed by the automatic leaping type, and the traverse track can also be reversed by themselves; Feed the beam at the tail; the bridge erection machine can meet the construction of wet joints, and it comes with a movable beam bottom operating platform, which can carry out wet joint construction and beam bottom decoration; or beam end block) block function; the pier support frame attached to the front of the front leg pier of the bridge erecting machine is light, safe and reliable, and can be quickly disassembled and transferred.

Description of drawings

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

Fig. 1 is the overall structure schematic diagram of the present invention;

2 is a schematic diagram of the support structure of the cover beam of the present invention;

Fig. 3 is the enlarged view of detail of A area in Fig. 2 of the present invention;

Fig. 4 is the assembly flow chart of the present invention;

Fig. 5 is a schematic diagram of step 1 assembling of the present invention;

Fig. 6 is the assembly schematic diagram of step 2 of the present invention;

7 is a schematic diagram of step 3 assembling of the present invention;

8 is a schematic diagram of step 4 assembling of the present invention;

Fig. 9 is the assembly schematic diagram of step 5 of the present invention;

Figure 10 is a schematic diagram of step 6 assembling of the present invention;

Figure 11 is a schematic diagram of the seventh step of assembling of the present invention;

Figure 12 is a schematic diagram of the eighth step of assembling of the present invention;

Figure 13 is a schematic diagram of step nine assembling of the present invention;

Figure 14 is a schematic diagram of step ten assembling of the present invention;

FIG. 15 is a schematic diagram of the eleventh step of the present invention assembling.

In the picture: 1. Cover beam; 2. Main beam of bridge erection machine; 3. Support beam; 4. Guide beam; 5. Crane crane; 6. Front auxiliary outrigger; 7. Middle outrigger; 8. Rear auxiliary Outrigger; 9. Connecting beam; 10. Single segment box beam; 11. Base; 12. Support seat; 13. Steel support column; 14. Support rod; 15. I-beam support; 16. Adjusting sand barrel; 17. Adjust the wedge.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to Fig. 1-15, a single-segment box girder bridge erection machine, including a cover beam 1 and a base 11, the outer side of the cover beam 1 is fixedly installed with the main beam 2 of the bridge erection machine, and the main beam of the bridge erection machine 2 It is the main support structure of the bridge erecting machine and provides stable support for the entire bridge erecting machine. The flange plate width of the main girder 2 of the bridge erecting machine is 1.4m, the beam height is 2.8m, and the total length is 33m (divided into 3 sections, section 2). The segment length is 11m), and the segments are connected by high-strength bolts. The segments can be transported by road or rail after disintegration. The lower flange plate and the bottom of the lower cover plate are provided with tracks for front auxiliary outriggers and hanging wheels. It is fixedly connected with the middle outrigger 7 and the rear auxiliary outrigger 8 through high-strength bolts. When the front auxiliary outrigger 6 moves longitudinally, it can move relative to the machine arm. When the beam is erected, the bridge erection machine is hinged with the arm through the supporting and hanging wheel set and the positioning device. The upper end of the main beam 2 is fixedly connected with a support beam 3. The support beam 3 is a structural beam and has a supporting function. The upper end of the support beam 3 is fixedly connected with a guide beam 4. The height of the guide beam 4 is 2.8m, and the length of a single guide beam is 46m. (Front guide beam 33.5: 11+11+11+1.5, rear guide beam: 12.5: 11+1.5), the upper end of the guide beam 4 is fixedly installed with a crane 5, which is the main work of the bridge erection machine The unit is equipped with an 80t hoisting mechanism hoist, control and operating system, the total weight of the crane is 40t, the weight of the hoisting trolley plus the slewing lug is 9.4t, the metal structure increases the weight of the traveling mechanism of the vehicle, and the equal weight is 17.5t. The overall dimensions (height of the crane x gauge x span) are 8.8 x 3.6 x 6m, the crane crane 5 adopts a concave structure frame, the running mechanism adopts chain drive traction, the heavy object mover runs under load, and the lifting trolley The hoisting mechanism is driven by a motor, driven by a built-in hoist in a planetary gear reducer. The high-speed shaft and drum of the hoisting mechanism are equipped with braking devices. The machine is connected by a gear coupling with a brake wheel; the low-speed stage adopts a hydraulic disc brake as an emergency brake to ensure the safe and reliable operation of the hoisting beam. Etc., the pulley set magnification is 2×16, and the load sensor is installed on the balance pulley frame, which can reflect the lifting load in real time. The hoisting mechanism of the crane 5 adopts an active rope arranging device for arranging the rope. The rope arranging device is composed of a frequency conversion motor, a sprocket, a chain, a screw, a nut, a guide rod, a support and a guide roller. It is a follow-up system. The winch forms a closed-loop control. The hoist rotates once, the guide roller of the rope arranger moves laterally a distance of the diameter of the wire rope, the guide roller goes to one end, the wire rope is wound on the reel one layer, and the guide roller moves in the opposite direction through the proximity switch to start the second layer of wire rope. Winding, the lower end of the guide beam 4 is fixedly connected with the front auxiliary outrigger 6, and the front auxiliary outrigger 6 is supported on the upright column of the advanced pier cap, which is mainly used for the rear auxiliary outrigger 8 and the middle outrigger 7 to be transported backwards when crossing the span. The overall size of the auxiliary outriggers 6 after assembling is 6.5×5.12×0.8m. The auxiliary front outriggers 6 are mainly composed of a supporting wheel mechanism, a folding column, a telescopic column, etc. When the beam is erected, it is fixed longitudinally with the machine arm into a hinged structure, forming a hinged structure. The flexible outriggers, together with the arm and the middle outrigger 7, form a gantry structure to meet the support requirements of the beam erection operation. The auxiliary front outrigger 6 and the arm can move relative to each other during the longitudinal movement operation, so as to realize the longitudinal movement of the bridge erecting machine. The auxiliary front outrigger 6 is provided with a folding mechanism, which can meet the needs of supporting the upper abutment of the auxiliary front outrigger when the normal frame beam and the last hole box girder are erected. The lower end of the guide beam 4 is fixedly connected with a middle outrigger 7, which 7. It is used to support and lift the whole bridge erecting machine, especially the support when the bridge erecting machine is fully loaded. There are jacking, transverse and longitudinal oil cylinders on it to drive the action of the bridge erecting machine. After the single middle outrigger 7 is assembled The overall size is 8.2×3.13×2.02m, and the total weight of a single middle outrigger 7 is 30t. The middle outrigger 7 realizes the support and removal of the support sleeper through the hydraulic cylinder to meet the requirements for stable support during step change during longitudinal movement and beam erection operation. , There is a traverse mechanism under the two legs, and the second column is driven by the traverse cylinder to drive the arm to swing its head, so as to adjust the position of the bridge erection machine horizontally to meet the needs of the curved beam erection. The lower cross beam is designed to be detachable, the lower end of the guide beam 4 is fixedly connected with a rear auxiliary leg 8, and the rear auxiliary leg 8 is supported on the beam surface, which is used to transport the rear middle leg 7 and replace the middle leg. 7 plays a supporting role (three-point support) until the bridge erecting machine is in the state of the maximum rear cantilever, the rear auxiliary leg 8 can be hung on the rear guide beam, and moves longitudinally along with the main frame. After the single rear auxiliary leg 8 is assembled The overall size is 7.64×3.85×1.76m, the total weight of a single rear auxiliary leg 8 is 12t, the lower end of the middle leg 7 is fixedly installed with a connecting beam 9, and the lower end of the connecting beam 9 is installed with a single segment box girder 10. The platform segment box girder 10 is prefabricated by reinforced concrete;

The base 11 is fixedly connected to the ground, the base 11 is a cast-in-place concrete pier, the upper end of the base 11 is fixedly connected with a support base 12, the base 11 provides a support structure for the support base 12, and the upper end of the support base 12 is fixedly connected with a steel support column 13 , the upper end of the support column 13 is fixedly connected with an I-beam support 15, the base 11, the support base 12 and the steel support column 13 are welded structures, which constitute the main support structure of the cantilever of the cover beam 1, and the upper end of the I-beam support 15 is fixedly connected There is an adjusting sand bucket 16 , an adjusting wedge 17 is fixedly connected to the upper end of the adjusting sand bucket 16 , and the adjusting wedge 17 is in contact with the bottom of the cantilever of the cover beam 1 .

A support rod 14 is installed in the middle of the steel support column 13 by bolts, and the support rod 14 is fastened with the cover beam 1 through bolts. For skewness, the adjusting wedge 17 is composed of two wedges and a tie rod, and nuts are installed on both sides of the tie rod, and the adjusting wedge 17 is pulled by the connecting rod to adjust the combined wedge, which is convenient for settlement compensation. The support seat 12, The steel support column 13 and the I-beam support 15 are welded structures, forming a cantilever support structure. The guide beam 4 is in the form of a rectangular truss structure. The chord is an I-beam made of welded steel plates. The box-shaped rod is formed, and the middle outriggers 7 are provided with oil cylinders for lifting, lateral movement and longitudinal movement, and the position of the relevant parts can be adjusted through the oil cylinders.

A method for operating a single-segment box girder bridge erecting machine, the specific steps comprising:

Step 1: Construction of the lower structure, after the completion of the lower structure, the top block of the middle fulcrum pier is hoisted by the bridge erection machine and temporarily fixed;

Step 2: Hoist the first span box girder, adjust the position of the box girder segment, and carry out pre-assembly;

Step 3: Apply adhesive on the matching surfaces of the first two box girders, match and position the two box girders, apply temporary prestress to squeeze and tighten, and repeat the above steps to assemble to No. 11 block;

Step 4: Install the wet joint formwork, pour the wet joint and maintain it, use the crane to hoist the top block of the advanced pier, and anchor it well;

Step 5: When the wet joints are poured to 95% of the concrete, the external prestressing is symmetrically tensioned in batches. After the tensioning is completed, the whole machine is unloaded, the hanging is removed, and it is transported upside down and hung to the ground;

Step 6: After the overhead crane is used to carry out the reverse transportation by leaps and bounds, the outriggers in the pier are moved to the leading pier and anchored well;

Step 7: The bridge erection machine moves forward longitudinally, the crane is located in front of the main frame as a counterweight, and the bridge erection machine is moved longitudinally in place and the posture of the bridge erection machine is adjusted;

Step 8: Assemble the mid-span main beams in the order of the first span, and pour the wet joints;

Step 9: When the concrete strength reaches 95%, the mid-span prestress is symmetrically tensioned in batches;

Step 10: construct the main beam of the tail span, and tension the prestressed steel bundle with negative bending moment after completion;

Step 11: Bridge deck paving and installation of ancillary facilities.

The beneficial effects of the present invention are as follows: in this scheme, the single-width whole-hole suspension assembly and erection of the segment assembly bridge erection machine is adopted, and then another frame of whole-hole suspension, assembly and erection is completed by horizontal movement, and the double-width frame is moved longitudinally to a new span after completion of the whole-hole installation. Cross completed erection.

The bridge erecting machine adopts the walking type, which can move through the holes by itself. The outriggers are reversed by the automatic leaping type, and the traverse track can also be reversed by themselves; Feed the beam at the tail; the bridge erection machine can meet the construction of wet joints, and it comes with a movable beam bottom operating platform, which can carry out wet joint construction and beam bottom decoration; or beam end block) block function; the pier support frame attached to the front of the front leg pier of the bridge erecting machine is light, safe and reliable, and can be quickly disassembled and transferred.

The above-disclosed preferred embodiments of the present invention are provided only to help illustrate the present invention. The preferred embodiments do not exhaust all the details, nor do they limit the invention to only the described embodiments. Obviously, many modifications and variations are possible in light of the content of this specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is to be limited only by the claims and their full scope and equivalents.

Claims (7)

1. A single segment box girder bridge erecting machine, comprising a cover beam (1) and a base (11), characterized in that: the outside of the cover beam (1) is fixedly installed with a bridge erection machine main beam (2) The upper end of the main beam (2) of the bridge erecting machine is fixedly connected with a support beam (3), the upper end of the support beam (3) is fixedly connected with a guide beam (4), and the upper end of the guide beam (4) is fixed A crane (5) is installed, the lower end of the guide beam (4) is fixedly connected with a front auxiliary leg (6), and the lower end of the guide beam (4) is fixedly connected with a middle support leg (7), so The lower end of the guide beam (4) is fixedly connected with a rear auxiliary leg (8), the lower end of the middle leg (7) is fixedly installed with a connecting beam (9), and the lower end of the connecting beam (9) is installed with a single beam. Platform segment box girder (10); The base (11) is fixedly connected to the ground, the upper end of the base (11) is fixedly connected with a support seat (12), and the upper end of the support seat (12) is fixedly connected with a steel support column (13), the support The upper end of the column (13) is fixedly connected with an I-beam support (15), the upper end of the I-beam support (15) is fixedly connected with a regulating sand barrel (16), and the upper end of the regulating sand barrel (16) is fixedly connected There are adjusting wedges (17), which are in contact with the cantilevered bottom of the cover beam (1). 2 . The single-segment box girder bridge erecting machine according to claim 1 , wherein a support rod ( 14 ) is installed in the middle of the steel support column ( 13 ) through bolts, and the support rod ( 14) Fasten the connection with the cover beam (1) by bolts. 3. A single-segment box girder bridge erecting machine according to claim 1, characterized in that the adjusting wedge (17) is composed of two wedges and a tie rod, and nuts are installed on both sides of the tie rod . 4 . The single-segment box girder bridge erecting machine according to claim 1 , wherein the support base ( 12 ), the support column ( 13 ) and the I-beam support ( 15 ) are welded structures. 5 . 5 . The single-segment box girder bridge erecting machine according to claim 1 , wherein the guide beam ( 4 ) is in the form of a rectangular truss structure, and the chord is an I-shaped welded steel plate. 6 . The beam and the web rod are box-shaped rods made of channel steel. 6 . The single-segment box girder bridge erecting machine according to claim 1 , wherein the middle outriggers ( 7 ) are provided with oil cylinders for jacking up, transverse movement and longitudinal movement. 7 . 7. An operation method of a single segment box girder bridge erecting machine, characterized in that the concrete steps comprise: Step 1: Construction of the lower structure, after the completion of the lower structure, the top block of the middle fulcrum pier is hoisted by the bridge erection machine and temporarily fixed; Step 2: Hoist the first span box girder, adjust the position of the box girder segment, and carry out pre-assembly; Step 3: Apply adhesive on the matching surfaces of the first two box girders, match and position the two box girders, apply temporary prestress to squeeze and tighten, and repeat the above steps to assemble to No. 11 block; Step 4: Install the wet joint formwork, pour the wet joint and maintain it, use the crane to hoist the top block of the advanced pier, and anchor it well; Step 5: When the wet joints are poured to 95% of the concrete, the external prestressing is symmetrically tensioned in batches. After the tensioning is completed, the whole machine is unloaded, the hanging is removed, and it is transported upside down and hung to the ground; Step 6: After the overhead crane is used to carry out the reverse transportation by leaps and bounds, the outriggers in the pier are moved to the leading pier and anchored well; Step 7: The bridge erection machine moves forward longitudinally, the crane is located in front of the main frame as a counterweight, and the bridge erection machine is moved longitudinally in place and the posture of the bridge erection machine is adjusted; Step 8: Assemble the mid-span main beams in the order of the first span, and pour the wet joints; Step 9: When the concrete strength reaches 95%, the mid-span prestress is symmetrically tensioned in batches; Step 10: Construct the main girder of the tail span, and tension the prestressed steel bundles with negative bending moment after completion; Step 11: Pave the bridge deck and install the ancillary facilities.

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