Continuous dismantling method for front guide beam in incremental launching construction

Abstract

The invention discloses a continuous dismantling method for a guide beam before incremental launching construction, which is characterized in that a hanging bracket fixing device and a hanging bracket structure are mounted on a cover beam to serve as a fixing foundation of jacking equipment and a counter-force support portal, so that the jacking equipment and the counter-force portal can respectively form support at the bottoms of two different guide beam sections; in the dismantling process, the first guide beam section located at the front end can be jacked through jacking equipment so that the first guide beam section can be lifted to the top of the second guide beam section located at the rear end, and then the first guide beam section is dragged so that the first guide beam section can slide to the rear portion along the second guide beam section in a sliding mode; therefore, the guide beam is demounted section by section while pushing is carried out; according to the method, high-altitude operation in the guide beam dismantling work can be effectively reduced so as to reduce the construction safety risk, and continuous segmented dismantling of the guide beam is achieved so as to improve the construction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering construction, in particular to a method for continuously removing a guide beam before jacking construction. Background Art

[0002] Bridge jacking construction is a construction method in which the prefabricated bridge sections are prefabricated in the background and then pushed down or pushed horizontally along the bridge piers by jacks and other equipment until the entire bridge is assembled. Jacking construction has the advantages of fast construction speed, little impact on traffic under the bridge, and low construction cost. In order to increase the span of the bridge suitable for jacking construction, guide beams are often used in jacking construction. The guide beams are set at the front end of the main beam to reduce the maximum cantilever length of the main beam, thereby reducing the internal force of the front end of the main beam during jacking construction and playing a guiding role. After the jacking construction is completed, the guide beams set at the front of the beam end as temporary construction measures must be removed. The existing removal methods mostly use large cranes to lift and remove them in sections; since the removal work is high-altitude work, there are high safety risks, and the construction cost is high and the construction efficiency is low.

[0003] A Chinese invention patent application with publication number CN118880757A discloses a foldable guide beam and a construction method, wherein the technical solution includes two sets of guide beams, each set of guide beams includes a front section of the guide beam and a rear section of the guide beam, the front section of the guide beam is connected to a front section connecting node, the rear section of the guide beam is connected to a rear section connecting node, the front section connecting node and the rear section connecting node are hingedly connected by a preset swivel hinge, a supporting truss is hingedly connected to the top of the rear section connecting node, the top of the supporting truss is connected to a control pulley, the control pulley is connected to the front section of the guide beam and the rear section of the guide beam by a steel strand, and a telescopic cylinder mechanism is drivingly connected between the front section of the guide beam and the rear section of the guide beam.

[0004] The technical solution of the above patent works through the telescopic cylinder mechanism in cooperation with the control pulley and steel strand on the supporting truss. Although it can realize the folding and recovery of the guide beam, it is still necessary to use a large crane for overall lifting and dismantling of the guide beam when folding and recovering the guide beam. The lifting operation still has a high operational risk. There are also technical problems of high construction cost and low construction efficiency that cannot be solved by using crane lifting. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for continuously removing the guide beam before jacking construction, which can effectively reduce the difficulty of removing the guide beam and improve the construction efficiency of removing the guide beam.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for continuously removing the guide beam before jacking construction, comprising the following steps:

[0007] Step S1, installing a hanger fixture on the cap beam, installing a hanger structure on the hanger fixture, and installing a jacking device and a reaction force support gantry on the hanger structure;

[0008] Step S2, jacking construction, pushing the guide beam until the connection point between the adjacent first guide beam segment and the second guide beam segment is located in the middle of the cap beam, so that the jacking equipment is supported at the bottom of the first guide beam segment, and the reaction force support gantry is supported at the bottom of the second guide beam segment;

[0009] Step S3, lifting the first guide beam segment by a lifting device, so that the bottom of the first guide beam segment is consistent with the top of the second guide beam segment;

[0010] Step S4, pulling the first guide beam segment by a pulling device, so that the first guide beam segment moves to the top of the second guide beam segment and then slides to the rear along the extension direction of the second guide beam segment;

[0011] Step S5, the lifting device is reset, and steps S2 to S4 are repeated until all the guide beams are removed.

[0012] As an improvement of the above scheme: in the step S1, the hanger fixing device includes two connecting parts respectively fixedly connected to the two ends of the cap beam, the hanger structure includes two main beams arranged in parallel on the outside of the two ends of the cap beam, the main beams are fixedly connected by three cross beams, and the jacking equipment and the reaction force support portal are fixed at the intersection of the cross beam and the main beam; the bottom of the connecting part of the hanger fixing device is provided with a limiting groove that forms a clearance fit with the main beam, and the main beam passes through the corresponding limiting groove and forms a rotatable connection with the connecting part through a pin shaft.

[0013] As an improvement of the above scheme: in step S1, multiple jacking devices are installed on the hanger structure, and the spacing of the jacking devices along the length direction of the first guide beam segment is less than half the length of the first guide beam segment, and the spacing of the jacking devices from the center of the cap beam is less than half the length of the first guide beam segment.

[0014] As an improvement of the above solution: a distribution beam is installed on the top of the jacking device, and the distribution beam is connected to the tops of at least two jacking devices in the width direction of the first guide beam segment.

[0015] As an improvement of the above scheme: in the step S4, at least one sliding ridge extending along the length direction is provided at the top of the first guide beam segment and the second guide beam segment, and at least one sliding groove extending along the length direction is provided at the bottom of the first guide beam segment and the second guide beam segment, and the sliding ridge is slidably matched with the sliding groove.

[0016] As an improvement of the above solution: the lifting device adopts a jack, and the traction device adopts a winch.

[0017] The beneficial effects of the present invention are as follows: the present invention installs a hanger fixing device and a hanger structure on the cap beam as a fixing basis for the jacking equipment and the reaction force support gantry, so that the jacking equipment and the reaction force gantry can respectively form supports at the bottoms of two different guide beam segments, and during dismantling, the first guide beam segment at the front end can be jacked up by the jacking equipment to lift it to the top of the second guide beam segment at the rear end, and then the first guide beam segment is pulled to slide along the second guide beam segment to the rear, thereby realizing the dismantling of the guide beam section by section while pushing; the present invention can effectively reduce the high-altitude operations during the dismantling of the guide beam to reduce the construction safety risks, and realize the continuous segmented dismantling of the guide beam to improve the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the hanger fixing device and the hanger structure after installation with the cap beam;

[0019] Figure 2 It is a schematic diagram of the support of the guide beam by the jacking equipment and the reaction support gantry;

[0020] Figure 3 It is a schematic diagram of the process of removing the guide beam according to the present invention;

[0021] Figure 4 Schematic diagram of the end structure of the guide beam segment.

[0022] Markings in the figure are: 100-cap beam, 200-hanger fixing device, 210-connecting part, 220-pin shaft, 300-hanger structure, 310-main beam, 320-cross beam, 400-lifting equipment, 500-reaction support portal frame, 610-first guide beam segment, 620-second guide beam segment, 630-distribution beam, 640-sliding ridge, 650-sliding groove, 700-traction equipment. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0024] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down”, and “inside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description. They do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0025] The method for continuous removal of the guide beam before jacking construction disclosed in the present invention adopts a hanger fixing device 200, a hanger structure 300, a jacking device 400 and a reaction support portal 500 to realize the segmented removal of the guide beam. The hanger fixing device 200 serves as a relay component between the hanger structure 300 and the cap beam 100, and is used to form a stable installation support foundation on the cap beam 100. The hanger structure 300 serves as a direct fixing foundation for the jacking device 400 and the reaction support portal 500, and is used to install the jacking device 400 and the reaction support portal 500. The jacking device 400 is used to support and lift the guide beam segment at the front end, and the reaction support portal 500 is used to support the guide beam segment at the rear end.

[0026] Specifically, Figures 1 to 3 As shown, the hanger fixing device 200 includes two connecting parts 210, and the two connecting parts 210 are fixedly connected to the two sides of the cap beam 100. The hanger structure 300 is composed of a main beam 310 and a cross beam 320. The two main beams 310 are respectively arranged on both sides of the cap beam 100, and the hanger structure 300 is connected and fixed to the hanger fixing device 200 through the two main beams 310; a limiting groove is arranged at the bottom of the connecting part 210 of the hanger fixing device 200, and the limiting groove and the main beam 310 are gap-matched to form a snap-on connection, and the main beam 310 passes through the limiting groove at the bottom of the corresponding connecting part 210, and the main beam 310 is connected to the connecting part 210 through the pin 220, so that the hanger fixing device 200 forms a relatively rotatable connection and cooperation relationship with the hanger structure 300 through the pin 220. Three cross beams 320 are arranged in the hanger structure 300. The three cross beams 320 are spaced apart from each other and arranged in parallel between the two main beams 310. The cross beams 320 are fixedly connected to the main beams 310 so that the hanger structure 300 forms a frame structure that intersects vertically and horizontally. The cross beams 320 connect the main beams 310 on both sides and reinforce the entire hanger structure 300.

[0027] Specifically, the present invention installs a jacking device 400 and a reaction force support portal frame 500 on the hanger structure 300. The number of jacking devices 400 is set to be multiple, and the jacking devices 400 are evenly arranged on the hanger structure 300. Since the jacking device 400 is used to jack up the first guide beam segment 610 at the front end, the jacking device 400 is arranged in the corresponding range of the first guide beam segment 610; considering the force balance of the hanger structure 300, the setting position of the jacking device 400 is preferably the intersection of the cross beam 320 and the main beam 310. The specific implementation method of the jacking device 400 is not limited. As long as the equipment that can achieve the jacking function can be selected, such as a hydraulic cylinder, a pneumatic cylinder, the present invention adopts a more conventional jack as the jacking device 400. The reaction force support portal frame 500 is a simple support frame structure, and the reaction force support portal frame 500 is composed of two vertical poles fixed on the hanger structure 300 and a horizontal bar vertically connected between the two vertical poles. When the reaction support gantry 500 supports the second guide beam segment 620, the weight of the hanger structure 300 can be used to provide reverse support to the hanger structure 300 during the process of the jacking equipment 400 lifting the first guide beam segment 610, so that the jacking equipment 400 can lift the first guide beam segment 610 to a suitable elevation.

[0028] Furthermore, the present invention limits the arrangement of the jacking equipment 400, so that the spacing of the jacking equipment 400 along the length direction of the first guide beam segment 610 is less than half of the length of the first guide beam segment 610, and the spacing of the jacking equipment 400 from the center of the cap beam 100 is less than half of the length of the first guide beam segment 610, so as to ensure that the first guide beam segment 610 will not be deflected during the process of jacking the first guide beam segment 610 by the jacking equipment 400, and ensure that it can maintain a horizontal state to reach an elevation suitable for traction.

[0029] In order to make the first guide beam segment 610 evenly stressed when the lifting device 400 lifts the first guide beam segment 610, it is avoided that the first guide beam segment 610 is deflected during the lifting process due to uneven distribution of the lifting force on the first guide beam segment 610. Figure 1 As shown, the present invention also installs a distribution beam 630 on the jacking device 400, and the distribution beam 630 is installed and fixed on the top of the jacking device 400, and the distribution beam 630 is connected to the tops of at least two jacking devices 400 in the width direction of the first guide beam segment 610. By setting the distribution beam 630, the jacking force applied by the jacking device 400 to the first guide beam segment 610 is distributed, so that the jacking force can be evenly dispersed to the first guide beam segment 610.

[0030] After the first guide beam segment 610 is lifted, the first guide beam segment 610 is moved to the rear by sliding. Figure 4 As shown, the sliding movement of the first guide beam segment 610 is realized by the cooperation of the sliding convex strip 640 and the sliding groove 650. The tops of the first guide beam segment 610 and the second guide beam segment 620 are provided with sliding convex strips 640 extending along the length direction, and the bottoms of the first guide beam segment 610 and the second guide beam segment 620 are provided with sliding grooves 650 extending along the length direction. The sliding convex strips 640 and the sliding grooves 650 are slidably cooperated. When the lifting device 400 lifts the first guide beam segment 610, the sliding convex strips 640 and the sliding grooves 650 are lifted. When the bottom of the first guide beam segment 610 is lifted up to be flush with the top of the second guide beam segment 620, the sliding groove 650 at the bottom of the first guide beam segment 610 is aligned with the sliding convex strip 640 at the top of the second guide beam segment 620, and the first guide beam segment 610 is pulled by the pulling device 700 so that the sliding convex strip 640 is inserted into the sliding groove 650, so that the first guide beam segment 610 can slide to the rear along the second guide beam segment 620 through the sliding cooperation between the sliding convex strip 640 and the sliding groove 650. The pulling device 700 for pulling the first guide beam segment 610 is a winch.

[0031] The method for continuously removing the guide beam before jacking construction disclosed by the present invention is carried out according to the following steps when removing the guide beam:

[0032] Step S1, installing a fixed hanger fixture 200 on the cap beam 100, installing a hanger structure 300 on the hanger fixture 200, and installing a jacking device 400 and a reaction force support portal frame 500 on the hanger structure 300;

[0033] Step S2: Pushing construction, pushing the guide beam until the connection point between the adjacent first guide beam segment 610 and the second guide beam segment 620 is located in the middle of the cap beam 100, so that the lifting device 400 is supported at the bottom of the first guide beam segment 610, and the reaction force support portal 500 is supported at the bottom of the second guide beam segment 620;

[0034] Step S3, lifting the first guide beam segment 610 by the lifting device 400, so that the bottom of the first guide beam segment 610 and the top of the second guide beam segment 620 are at the same elevation;

[0035] Step S4, pulling the first guide beam segment 610 by the pulling device 700, so that the first guide beam segment 610 moves to the top of the second guide beam segment 620, and then slides to the rear along the extension direction of the second guide beam segment 620;

[0036] Step S5, the lifting device 400 is reset, and steps S2 to S4 are repeated, and the guide beams are removed in sections while pushing, until all the guide beams are removed.

Claims

1. A method for continuous removal of guide beams before jacking construction, characterized in that: The following steps are involved: Step S1, installing a hanger fixing device (200) on the cap beam (100), installing a hanger structure (300) on the hanger fixing device (200), and installing a jacking device (400) and a reaction force support portal frame (500) on the hanger structure (300); Step S2, jacking construction, pushing the guide beam until the connection point between the adjacent first guide beam segment (610) and the second guide beam segment (620) is located in the middle of the cap beam (100), so that the jacking device (400) is supported at the bottom of the first guide beam segment (610), and the reaction force support portal (500) is supported at the bottom of the second guide beam segment (620); Step S3, lifting the first guide beam segment (610) by using the lifting device (400) so that the bottom of the first guide beam segment (610) and the top of the second guide beam segment (620) are at the same elevation; Step S4, pulling the first guide beam segment (610) by means of a pulling device (700), so that the first guide beam segment (610) moves to the top of the second guide beam segment (620) and then slides to the rear along the extension direction of the second guide beam segment (620); Step S5, the lifting device (400) is reset, and steps S2 to S4 are repeated until all the guide beams are removed.

2. The method for continuous removal of guide beams before jacking construction according to claim 1, characterized in that: In step S1, the hanger fixing device (200) includes two connecting parts (210) respectively fixedly connected to the two ends of the cap beam (100), and the hanger structure (300) includes two main beams (310) arranged in parallel on the outer sides of the two ends of the cap beam (100), and the main beams (310) are fixedly connected by three cross beams (320), and the jacking equipment (400) and the reaction force support portal (500) are fixedly arranged at the intersection of the cross beam (320) and the main beam (310); the bottom of the connecting part (210) of the hanger fixing device (200) is provided with a limiting groove that forms a clearance fit with the main beam (310), and the main beam (310) passes through the corresponding limiting groove and forms a rotatable connection with the connecting part (210) through the pin shaft (220).

3. The method for continuous removal of guide beams before jacking construction according to claim 1, characterized in that: In step S1, a plurality of jacking devices (400) are installed on the hanger structure (300), and the spacing of the jacking devices (400) along the length direction of the first guide beam segment (610) is less than half the length of the first guide beam segment (610), and the spacing of the jacking devices (400) from the center of the cap beam (100) is less than half the length of the first guide beam segment (610).

4. The method for continuous removal of guide beams before jacking construction according to claim 3, characterized in that: A distribution beam (630) is installed on the top of the jacking device (400), and the distribution beam (630) is connected to the tops of at least two jacking devices (400) in the width direction of the first guide beam segment (610).

5. The method for continuous removal of guide beams before jacking construction according to claim 1, characterized in that: In step S4, at least one sliding convex strip (640) extending along the length direction is provided at the top of the first guide beam segment (610) and the second guide beam segment (620), and at least one sliding groove (650) extending along the length direction is provided at the bottom of the first guide beam segment (610) and the second guide beam segment (620), and the sliding convex strip (640) and the sliding groove (650) are slidably matched.

6. The method for continuous removal of guide beams before jacking construction according to claim 1, characterized in that: The lifting device (400) is a jack, and the traction device (700) is a winch.

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