Method for integrally dismantling front guide beam in incremental launching construction by cable-stayed buckling and hanging method

Abstract

The invention discloses an integral dismantling method for a front guide beam in incremental launching construction through a cable-stayed buckling and hanging method. The lug plate is installed at the end of the end, connected with the guide beam, of the main beam, so that the main beam and the guide beam are in limiting fit which can only move relatively in the height direction, the other end of the guide beam is tensioned through the buckling cable of the buckling tower, and meanwhile the end, connected with the main beam, of the guide beam is jacked; under the condition that the jacking force of the jacking jack and the tensioning force of the buckle cable are applied to the two ends of the guide beam correspondingly, the guide beam is jacked upwards in the horizontal state till the elevation of the bottom of the guide beam is consistent with the elevation of the top of the main beam, the guide beam can be moved to the main beam under the action of the tensioning force of the buckle cable, and therefore the guide beam can be moved to the main beam. And then the guide beam is moved to the rear through sliding fit of the guide beam and the main beam, and overall dismantling of the whole guide beam is achieved. By means of the method, aerial work in the guide beam dismantling work can be effectively reduced so as to reduce the construction safety risk, and overall 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 integrally removing a guide beam before top-pushing construction using an inclined-stayed buckle-hanging method. 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, the inclined buckle hanging method is often used for jacking construction, which can greatly increase the length of jacking. The guide beam is 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 the jacking construction process, and can play a guiding role. After the jacking construction is completed, the guide beam set at the front of the temporary construction measure at the front of the beam end must be removed. The existing removal method mostly uses a large crane to hoist and remove it in sections; since the removal work is high-altitude operation, there is a high safety risk, 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 overall removal of the guide beam before jacking construction by using the oblique-stayed buckle-hanging method, which can effectively reduce the difficulty of overall removal of the guide beam and improve the construction efficiency of overall removal of the guide beam.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for removing the guide beam as a whole before the top-pushing construction by the inclined-stayed buckle-hanging method, comprising the following steps:

[0007] Step S1, installing ear plates at the connection ends of the main beam and the guide beam, wherein the opposite surfaces of the ear plates are provided with concave-convex structures, and the extending direction of the concave-convex structures is the height direction of the main beam and the guide beam, and the ear plates on the main beam and the guide beam are staggered and opposite to each other;

[0008] Step S2: Pushing the main beam into place so that the main beam and the guide beam engage with each other through the concave-convex structure on the ear plate to form a plug-in fit;

[0009] Step S3, installing a top plate and a continuous jack on the main beam, wherein the top plate has the same concave-convex structure as the ear plate, so that the top plate is arranged perpendicular to the main beam and the front end surface of the top plate is flush with the end surface of the main beam, and the continuous jack is supported on the rear end surface of the top plate;

[0010] Step S4, connecting and fixing the buckle cable on the buckle tower to the end of the guide beam away from the main beam, and tightening the buckle cable;

[0011] Step S5, lifting the end of the guide beam close to the main beam by using a lifting jack, and at the same time tightening and retracting the buckle cable, so that the guide beam is kept horizontal and lifted until the bottom elevation of the guide beam is consistent with the top elevation of the main beam;

[0012] Step S6, the guide beam slides along the main beam by retracting the continuous jack and moving the continuous jack backward on the main beam, until the guide beam as a whole completely slides onto the main beam;

[0013] Step S7, remove the buckle cable, slide the guide beam from the main beam to the rear as a whole, and complete the removal of the entire guide beam.

[0014] As an improvement of the above scheme: in the step S1, an ear plate is respectively installed on both sides of the connecting end of the main beam and the guide beam; in the step S3, the concave-convex structure on the top plate is arranged near the two side edges of the top plate, and the concave-convex structures on both sides of the top plate are respectively offset and opposite to the concave-convex structures on the ear plates on both sides of the guide beam end.

[0015] As an improvement of the above solution: in step S3, two continuous jacks are arranged on each main beam to support the top plate; in step S6, the two continuous jacks on the same main beam work alternately.

[0016] As an improvement of the above scheme: in the step S6, at least one sliding ridge extending along the length direction of the main beam is provided at the top of the main beam, and at least one sliding groove extending along the length direction of the guide beam is provided at the bottom of the guide beam, and the sliding ridge and the sliding groove are slidably matched.

[0017] The beneficial effects of the present invention are as follows: the present invention installs an ear plate at the end where the main beam and the guide beam are connected, so that a limit fit is formed between the main beam and the guide beam so that they can only move relative to each other in the height direction, and then the other end of the guide beam is tightened by the buckle cable of the buckle tower, and at the same time, the end of the guide beam connected to the main beam is lifted up, and when the lifting force of the lifting jack and the tensioning force of the buckle cable are respectively applied to the two ends of the guide beam, the guide beam is kept in a horizontal state and lifted up upward due to the limit fit between the main beam and the guide beam, until it is lifted to the same elevation as the bottom of the guide beam and the top of the main beam, and under the action of the tensioning force of the buckle cable, the guide beam can be moved onto the main beam, and then the guide beam is moved to the rear through the sliding fit between the guide beam and the main beam, so as to realize the overall removal of the entire guide beam; the present invention can effectively reduce the high-altitude operations in the removal of the guide beam to reduce the construction safety risks, and realize the overall removal of the guide beam to improve the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention when the guide beam is removed;

[0019] Figure 2 A schematic diagram of the structure of the connection between the main beam and the guide beam;

[0020] Figure 3 This is a schematic diagram of the end structure of the main beam;

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

[0022] Figure 5 This is a schematic diagram of the guide beam being jacked up;

[0023] Figure 6 Schematic diagram of the guide beam sliding on the main beam.

[0024] Markings in the figure are: 100-main beam, 200-guide beam, 300-ear plate, 400-top plate, 510-continuous jack, 520-lifting jack, 610-buckle tower, 620-buckle cable, 710-sliding convex strip, 720-sliding groove. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0026] 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.

[0027] The method for dismantling the guide beam as a whole before the top-pushing construction disclosed by the present invention is carried out according to the following steps when dismantling the guide beam:

[0028] Step S1: Figure 1 and Figure 3 As shown, a lug plate 300 is installed at the end of the main beam 100 and the guide beam 200 that are connected. The lug plate 300 is installed to form a limiting fit between the main beam 100 and the guide beam 200.

[0029] Specifically, the opposite surfaces of the ear plates 300 installed on the main beam 100 and the guide beam 200 are provided with concavo-convex structures, that is, the convex strips and the concave grooves are arranged in sequence on the ear plates 300, and the convex strips and the concave grooves extend in the height direction of the main beam 100 and the guide beam 200, so that the concavo-convex structures on the ear plates 3300 extend along the height direction of the corresponding main beam 100 or the guide beam 200. The ear plates 300 on the main beam 100 and the guide beam 200 are offset and opposite, that is, the convex strips of the ear plates 300 on the main beam 100 are opposite to the concave grooves of the ear plates 300 on the guide beam 200, and the concave grooves of the ear plates 300 on the main beam 100 are opposite to the convex strips of the ear plates 300 on the guide beam 200. When the main beam 100 and the guide beam 200 are connected, the ear plates 300 are engaged with each other through the concavo-convex structures to form a limited fit.

[0030] Furthermore, in order to avoid making major changes to the structures of the main beam 100 and the guide beam 200, and to improve the effect of the position-limiting cooperation and the force balance between the main beam 100 and the guide beam 200, as shown in FIG. Figure 3 As shown, the present invention installs an ear plate 300 on both sides of the ends of the main beam 100 and the guide beam 200. The main beam 100 and the guide beam 200 form a limited fit through the ear plate 300. Due to the limitation of the extension direction of the concave-convex structure on the ear plate 300, the main beam 100 and the guide beam 200 can only move relative to each other in the extension direction of the concave-convex structure.

[0031] Step S2, carry out jacking construction according to the jacking construction method in conventional construction, and push the main beam 100 into place so that the connection between the main beam 100 and the guide beam 200 is located at the center of the cap beam; after the main beam 100 is connected with the guide beam 200, the main beam 100 and the guide beam 200 are plug-in fit through the mutual engagement of the concave and convex structures on the ear plate 300. At this time, the relative movement of the main beam 100 and the guide beam 200 in the horizontal direction is restricted under the limiting action of the plug-in fit of the ear plate 300.

[0032] Step S3, installing the top plate 400 and the continuous jack 510 on the main beam 100. The top plate 400 is used to engage with the ear plate 300 on the guide beam 200 to form a limit fit, and the top plate 400 is also provided with the same concave-convex structure as the ear plate 300 on the main beam 100. Since the ear plates 300 on the main beam 100 and the guide beam 200 are arranged on both sides, and the top plate 400 adopts an integral plate structure to receive the guide beam 200, the concave-convex structure on the top plate 400 is arranged on the side of the top plate 400 facing the guide beam 200, that is, on the front end surface of the top plate 400, and is located near the two sides of the top plate 400; the top plate 400 is arranged vertically, and the top plate 400 and the main beam 100 are aligned. 0, that is, the top plate 400 is placed vertically on the main beam 100. After the top plate 400 is installed on the top of the end of the main beam 100 close to the guide beam 200, the front end surface of the top plate 400 is flush with the end surface of the main beam 100, and the concave-convex structure on the top plate 400 can be connected with the concave-convex structure of the ear plate 300 on the main beam 100, so as to form a continuous concave-convex structure between the top plate 400 and the ear plate 300 on the main beam 100; at the same time, the concave-convex structures on both sides of the top plate 400 can be respectively offset and opposite to the concave-convex structures on the ear plates 300 on both sides of the end of the guide beam 200. The continuous jack 510 is used to support the top plate 400 so that the top plate 400 remains in a vertical state. The output end of the continuous jack 510 is connected to the side of the top plate 400 away from the guide beam 200, that is, supported on the rear end surface of the top plate 400. The continuous jack 510 is installed on the top of the main beam 100 and can move on the main beam 100. In the subsequent steps, when the guide beam 200 slides on the main beam 100, the continuous jack 510 can provide support force for the top plate 400 to block the guide beam 200 and control the guide beam 200 to slide on the main beam 100 at a uniform speed.

[0033] Furthermore, in order to improve the supporting effect of the continuous jack 510 on the top plate 400 and improve the control effect of the continuous jack 510 on the sliding speed of the guide beam 200, as shown in FIG. Figure 2 As shown, in the present invention, two continuous jacks 510 are arranged on each main beam 100 , and the two continuous jacks 510 on the same main beam 100 are supported on both sides of the rear end surface of the top plate 400 respectively.

[0034] Step S4: Figure 1 As shown, the buckle cable 620 on the buckle tower 610 is connected and fixed to the end of the guide beam 200 away from the main beam 100, and the buckle cable 620 is tightened. The end of the guide beam 200 is tightened by the buckle cable 620 on the buckle tower 610, and the buckle cable 620 is used to apply a force along the extension direction of the buckle cable 620 to the guide beam 200. At this time, the guide beam 200 forms a limited fit with the main beam 100 through the ear plate 300, and the end of the guide beam 200 is limited by the end of the main beam 100, so the guide beam 200 remains in a horizontal state.

[0035] Step S5: Figure 4 and Figure 5 As shown, a plurality of lifting jacks 520 are installed below the end of the guide beam 200, and the lifting jacks 520 apply an upward lifting force to the end of the guide beam 200 connected to the main beam 100, and the buckle cable 620 is tightened and retracted. The two ends of the guide beam 200 are respectively subjected to the lifting force applied by the lifting jacks 520 and the tensioning force applied by the buckle cable 620, and the end of the guide beam 200 and the end of the main beam 100 form a limited fit through the ear plate 300. Under the joint action of multiple forces, the guide beam 200 is kept in a horizontal state and moves upward; the lifting jacks 520 continue to lift the guide beam 200 until the bottom elevation of the guide beam 200 is consistent with the top elevation of the main beam 100, at which time the end of the guide beam 200 contacts the top plate 400, and the concave-convex structure of the ear plate 300 on the guide beam 200 is engaged with the concave-convex structure on the top plate 400.

[0036] Step S6, after the guide beam 200 is lifted up by the lifting jack 520 until it is completely connected with the top plate 400, the continuous jack 510 starts to work. Since the end of the guide beam 200 away from the top plate 400 is subjected to the tension of the buckle cable 620, the guide beam 200 is pushed toward the top plate 400. At this time, the continuous jack 510 retracts to reduce the support force on the top plate 400, so that the top plate 400 can move backward under the push of the guide beam 200. At the same time, the blocking force of the top plate 400 on the guide beam 200 is reduced, and the guide beam 200 moves backward on the main beam 100 under the tension of the buckle cable 620; the two continuous jacks 510 on the same main beam 100 work alternately to control the guide beam 200 and the top plate 400 to slide at a uniform speed on the main beam 100 until the guide beam 200 moves backward on the main beam 100. Figure 6 As shown, the guide beam 200 is completely slid onto the main beam 100 as a whole.

[0037] Furthermore, in order to ensure that the guide beam 200 can slide smoothly on the main beam 100, as Figures 3 to 5As shown, the present invention realizes the sliding fit between the guide beam 200 and the main beam 100 by providing a sliding convex strip 710 and a sliding groove 720. The top of the main beam 100 is provided with a sliding convex strip 710 extending along the length direction of the main beam 100, and the bottom of the guide beam 200 is provided with a sliding groove 720 extending along the length direction of the guide beam 200, and the sliding convex strip 710 and the sliding groove 720 are slidably matched. When the guide beam 200 rises to the point where the bottom of the guide beam 200 is flush with the top of the main beam 100 under the lifting action of the lifting jack 520, the sliding groove 720 at the bottom of the guide beam 200 is aligned with the sliding convex strip 710 at the top of the main beam 100, and then the sliding convex strip 710 is inserted into the corresponding sliding groove 720 under the tensioning force of the buckle cable 620. In order to improve the sliding fit effect between the main beam 100 and the guide beam 200, the number of sliding grooves 720 of the sliding convex strip 710 can be increased.

[0038] Step S7, remove the buckle cable 620 and the buckle tower 610, and use the sliding protrusion 710 on the main beam 100 to slide the buckle tower 610 as a whole to the rear, and then slide the guide beam 200 as a whole from the main beam 100 to the rear, completing the removal of the entire guide beam 200.

Claims

1. The overall removal method of the guide beam before the top-pushing construction by the inclined buckle hanging method is characterized by: The following steps are involved: Step S1, installing an ear plate (300) at the connection end of the main beam (100) and the guide beam (200), wherein a concave-convex structure is provided on the opposite surface of the ear plate (300), and the extending direction of the concave-convex structure is the height direction of the main beam (100) and the guide beam (200), and the ear plates (300) on the main beam (100) and the guide beam (200) are staggered and opposite to each other; Step S2: Pushing the main beam (100) into place, so that the main beam (100) and the guide beam (200) are engaged with each other through the concave-convex structure on the ear plate (300) to form a plug-in fit; Step S3, installing a top plate (400) and a continuous jack (510) on the main beam (100), wherein the top plate (400) has the same concave-convex structure as the ear plate (300), so that the top plate (400) is arranged perpendicular to the main beam (100) and the front end surface of the top plate (400) is flush with the end surface of the main beam (100), and the continuous jack (510) is supported on the rear end surface of the top plate (400); Step S4, connecting and fixing the buckling cable (620) on the buckling tower (610) to the end of the guide beam (200) away from the main beam (100), and tightening the buckling cable (620); Step S5, lifting the end of the guide beam (200) close to the main beam (100) by means of a lifting jack (520), and at the same time tightening and retracting the buckle cable (620), so that the guide beam (200) is kept horizontal and lifted until the bottom elevation of the guide beam (200) is consistent with the top elevation of the main beam (100); Step S6, the guide beam (200) slides along the main beam (100) by retracting the continuous jack (510) and moving the continuous jack (510) backward on the main beam (100), until the guide beam (200) completely slides onto the main beam (100); Step S7, remove the buckle cable (620), slide the guide beam (200) from the main beam (100) to the rear as a whole, and complete the removal of the entire guide beam (200).

2. The method for removing the guide beam as a whole before the top-pushing construction by the inclined-stayed buckle-hanging method as claimed in claim 1 is characterized by: In the step S1, an ear plate (300) is respectively installed on both sides of the connection end of the main beam (100) and the guide beam (200); in the step S3, the concave-convex structure on the top plate (400) is arranged near the two side edges of the top plate (400), and the concave-convex structures on both sides of the top plate (400) are respectively offset and opposite to the concave-convex structures on the ear plates (300) on both sides of the end of the guide beam (200).

3. The method for removing the guide beam as a whole before the top-pushing construction by the inclined-stayed buckle-hanging method as claimed in claim 1 is characterized by: In the step S3, two continuous jacks (510) are arranged on each main beam (100) to support the top plate (400); and in the step S6, the two continuous jacks (510) on the same main beam (100) work alternately.

4. The method for removing the guide beam as a whole before the top-pushing construction by the inclined-stayed buckle-hanging method as claimed in claim 1 is characterized by: In step S6, at least one sliding convex strip (710) extending along the length direction of the main beam (100) is provided on the top of the main beam (100), and at least one sliding groove (720) extending along the length direction of the guide beam (200) is provided on the bottom of the guide beam (200), and the sliding convex strip (710) and the sliding groove (720) are slidably matched.

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