Method for overall removal of front beam before pushing construction by inclined cable buckling and hanging method

Abstract

The application discloses a method for integrally removing a guide beam before pushing construction by means of a stay and hanging method. The method comprises the following steps: installing an ear plate at the end of the main beam and the guide beam, so that a limiting fit is formed between the main beam and the guide beam, which can only move in the height direction; pulling the other end of the guide beam tightly by means of the stay of the tower; lifting the end of the guide beam and the main beam; under the lifting force of the lifting jack and the pulling force of the stay, the guide beam is kept in a horizontal state and is lifted upward until the elevation of the bottom of the guide beam and the top of the main beam is consistent; under the pulling force of the stay, the guide beam can be moved to the main beam; then, the guide beam is moved to the rear through the sliding fit between the guide beam and the main beam, and the integral removal of the guide beam is realized. The application can effectively reduce the high-altitude operation in the guide beam removal work, reduce the construction safety risk, realize the integral removal of the guide beam and improve the construction efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge engineering construction technology, and in particular to a method for integrally removing a front guide beam before incremental launching construction by the cable-stayed buckle hanging method. BACKGROUND

[0002] Bridge incremental launching construction is a method of sliding or horizontally pushing prefabricated bridge segments along the piers by jacks and other equipment until the full bridge is assembled. Incremental launching construction has the advantages of fast construction speed, little impact on traffic under the bridge, and low construction cost. In order to increase the bridge span applicable to incremental launching construction, the cable-stayed buckle hanging method is often used for incremental launching construction, which can greatly increase the length of incremental launching. The front guide beam is arranged 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 incremental launching construction and playing a guiding role. After the incremental launching construction is completed, the construction temporary measure front guide beam arranged at the front end of the beam must be removed. The existing removal method often uses a large crane to hoist and remove the guide beam in sections. Since the removal work is high-altitude work, there is a high safety risk, and the construction cost is high and the construction efficiency is low.

[0003] Chinese patent application No. CN118880757A discloses a foldable guide beam and a construction method. The technical solution includes two guide beams. Each guide beam includes a front guide beam segment and a rear guide beam segment. The front guide beam segment is connected with a front segment connecting node, and the rear guide beam segment is connected with a rear segment connecting node. The front segment connecting node and the rear segment connecting node are connected by a preset hinge. A supporting truss is hingedly connected to the top of the rear segment connecting node. A control pulley is connected to the top of the supporting truss. The front guide beam segment and the rear guide beam segment are connected by a steel strand on the control pulley. A telescopic oil cylinder mechanism is drivingly connected between the front guide beam segment and the rear guide beam segment.

[0004] The technical solution of the above-mentioned patent uses the telescopic oil cylinder mechanism in cooperation with the control pulley on the supporting truss and the steel strand to achieve the folding and recycling of the guide beam. However, the guide beam still needs to be hoisted and removed integrally by a large crane during folding and recycling, and the hoisting operation still has a high risk. The construction cost is high and the construction efficiency is low, which cannot be solved by using a crane. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a method for integrally removing a front guide beam before incremental launching construction by the cable-stayed buckle hanging method, which can effectively reduce the difficulty of integrally removing the guide beam and improve the construction efficiency of integrally removing the guide beam.

[0006] To solve the above technical problems, the technical solution adopted by the present application is a method for integrally removing a front guide beam before incremental launching construction by the cable-stayed buckle hanging method, comprising the following steps:

[0007] Step S1, installing an ear plate on the connecting end of the main beam and the guide beam, the opposite surfaces of the ear plate are provided with concave-convex structures, the extension 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 oppositely arranged in a staggered manner;

[0008] Step S2, pushing the main beam into place by the incremental launching construction, so that the main beam and the guide beam are engaged with each other through the concave-convex structures 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, the top plate has the same concave-convex structures as the ear plate, the top plate is arranged perpendicularly to the main beam, 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 through the lifting jack, and simultaneously tightening and retracting the buckle cable, so that the guide beam is kept horizontal and is lifted to the bottom elevation of the guide beam being consistent with the top elevation of the main beam;

[0012] Step S6, sliding the guide beam along the main beam through the retraction of the continuous jack and the backward movement of the continuous jack on the main beam, until the guide beam is completely slid onto the main beam;

[0013] Step S7, removing the buckle cable, and sliding the guide beam from the main beam to the rear to complete the removal of the entire guide beam.

[0014] As an improvement of the above scheme: in step S1, one ear plate is installed on each side of the connecting end of the main beam and the guide beam; in step S3, the concave-convex structures on the top plate are arranged close to the two side edges of the top plate, and the concave-convex structures on the two side edges of the top plate are oppositely arranged in a staggered manner with the concave-convex structures on the ear plates on the two side edges of the end head of the guide beam.

[0015] As an improvement of the above scheme: 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 step S6, at least one sliding convex strip extending along the length direction of the main beam is arranged on the top of the main beam, and at least one sliding concave groove extending along the length direction of the guide beam is arranged on the bottom of the guide beam, and the sliding convex strip and the sliding concave groove are in sliding fit.

[0017] The beneficial effects of the present application are: the present application installs the lug plate at the end of the main beam and the guide beam, forms the limiting cooperation between the main beam and the guide beam which can only move in the height direction, then tightens the other end of the guide beam through the buckle cable of the buckle tower, and jacks up the end of the guide beam connected with the main beam, under the jacking force of the jacking jack and the tension force of the buckle cable applied at both ends of the guide beam, the guide beam is kept in the horizontal state and is jacked up upward, until the guide beam is jacked up to the same elevation as the top of the main beam, under the tension force of the buckle cable, the guide beam can be moved to the main beam, then the guide beam is moved to the rear through the sliding cooperation between the guide beam and the main beam, and the whole guide beam is removed; the present application can effectively reduce the high-altitude operation in the guide beam removal work to reduce the construction safety risk, and realize the whole removal of the guide beam to improve the construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the whole structure schematic diagram when the present application carries out the guide beam removal construction.

[0019] Figure 2 It is the structure schematic diagram of the connection between the main beam and the guide beam.

[0020] Figure 3 It is the end structure schematic diagram of the main beam.

[0021] Figure 4 It is the end structure schematic diagram of the guide beam.

[0022] Figure 5 It is the schematic diagram when the guide beam is jacked up.

[0023] Figure 6 It is the schematic diagram when the guide beam slides on the main beam.

[0024] In the drawing, 100 is the main beam, 200 is the guide beam, 300 is the lug plate, 400 is the top plate, 510 is the continuous jacking jack, 520 is the jacking jack, 610 is the buckle tower, 620 is the buckle cable, 710 is the sliding convex strip, and 720 is the sliding groove. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present application, the present application will be further described below in combination with the drawings.

[0026] In the description of the present application, it should be noted that the terms "front", "rear", "left", "right", "upper", "lower", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0027] The whole removal method of the guide beam in the cable-stayed buckle hanging method incremental launching construction disclosed by the application removes the guide beam according to the following steps:

[0028] Step S1, as shown in Figure 1 and Figure 3 , an ear plate 300 is installed at the end of the main beam 100 and the guide beam 200, and the ear plate 300 is used to form a limiting fit between the main beam 100 and the guide beam 200.

[0029] Specifically, the opposite surfaces of the ear plate 300 installed on the main beam 100 and the guide beam 200 are provided with concave-convex structures, that is, the convex strips and the concave grooves are arranged on the ear plate 300 in sequence and at intervals, 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 concave-convex structures on the ear plate 300 extend in the height direction of the corresponding main beam 100 or guide beam 200. The ear plates 300 on the main beam 100 and the guide beam 200 are in a staggered relationship, that is, the convex strip of the ear plate 300 on the main beam 100 is opposite to the concave groove of the ear plate 300 on the guide beam 200, and the concave groove of the ear plate 300 on the main beam 100 is opposite to the convex strip of the ear plate 300 on the guide beam 200, so that when the main beam 100 and the guide beam 200 are connected, the ear plates 300 are engaged with each other through the concave-convex structures to form a limiting fit.

[0030] Further, in order to avoid making large changes to the structure of the main beam 100 and the guide beam 200 and to improve the effect of the limiting fit and the balance of the stress between the main beam 100 and the guide beam 200, as shown in Figure 3 , one ear plate 300 is installed on each side of the end of the main beam 100 and the guide beam 200. The main beam 100 and the guide beam 200 form a limiting fit through the ear plate 300, and due to the limitation of the extension direction of the concave-convex structures 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 structures.

[0031] Step S2, the incremental launching construction method in the conventional construction is used for incremental launching construction, the main beam 100 is launched in place, and the connection between the main beam 100 and the guide beam 200 is located at the center of the bent cap; after the main beam 100 and the guide beam 200 are connected, the main beam 100 and the guide beam 200 form a plug-in fit through the mutual engagement of the concave-convex structures on the ear plate 300, and at this time, the relative movement of the main beam 100 and the guide beam 200 in the horizontal direction is limited under the limiting action of the plug-in fit of the ear plate 300.

[0032] Step S3, install the top plate 400 and the continuous jack 510 on the main beam 100. The top plate 400 is used to engage with the lug plate 300 on the guide beam 200 to form a limiting fit, and the top plate 400 is also provided with the same concave-convex structure as the lug plate 300 on the main beam 100. Since the lug 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 slab structure to support 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, i.e. on the front end face of the top plate 400, and is located near the two side edges of the top plate 400. The top plate 400 is vertically arranged, and there is no connection relationship between the top plate 400 and the main beam 100, i.e. the top plate 400 is vertically placed on the main beam 100. After the top plate 400 is installed on the end head of the main beam 100 near the guide beam 200, the front end face of the top plate 400 is flush with the end face of the main beam 100, and the concave-convex structure on the top plate 400 can be supported by the concave-convex structure of the lug plate 300 on the main beam 100, forming a continuous concave-convex structure between the top plate 400 and the lug plate 300 on the main beam 100. At the same time, the concave-convex structures on the two sides of the top plate 400 can be respectively misaligned with the concave-convex structures on the lug plates 300 on the two sides of the end head of the guide beam 200. The continuous jack 510 is used to support the top plate 400 to keep the top plate 400 in a vertical state, and the output end of the continuous jack 510 is connected to the side of the top plate 400 away from the guide beam 200, i.e. supported on the rear end face 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, controlling the guide beam 200 to slide uniformly on the main beam 100.

[0033] Further, 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 Figure 2 , two continuous jacks 510 are arranged on each main beam 100, and the two continuous jacks 510 on the same main beam 100 are respectively supported on the two sides of the rear end face of the top plate 400.

[0034] Step S4, as shown in Figure 1 , connect and fix the buckle cable 620 on the buckle tower 610 to the end of the guide beam 200 away from the main beam 100, and tighten the buckle cable 620. The end of the guide beam 200 is tightened by the buckle cable 620 on the buckle tower 610, and the guide beam 200 is subjected to the action force in the extension direction of the buckle cable 620 by the tightening action of the buckle cable 620. At this time, the guide beam 200 keeps a horizontal state due to the limiting fit between the guide beam 200 and the main beam 100 through the lug plate 300, and the end of the guide beam 200 is limited by the end of the main beam 100.

[0035] Step S5, as shown in Figure 4 and Figure 5 A plurality of jacking jacks 520 are installed below the end of the guide beam 200, and the jacking jacks 520 apply upward jacking force to the end of the guide beam 200 connected to the main beam 100, while the buckle cable 620 is tightened and retracted. The two ends of the guide beam 200 are subjected to the jacking force applied by the jacking jacks 520 and the tightening force applied by the buckle cable 620, while the end of the guide beam 200 and the end of the main beam 100 are limited by the ear plate 300. Under the combined action of multiple forces, the guide beam 200 moves upward in a horizontal state; the jacking jacks 520 continuously jack up 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 engages with the concave-convex structure on the top plate 400.

[0036] Step S6, after the guide beam 200 rises to completely connect with the top plate 400 under the jacking action of the jacking jacks 520, the continuous jacking jacks 510 start to work. Since the end of the guide beam 200 away from the top plate 400 is subjected to the tightening force of the buckle cable 620, the guide beam 200 is pushed towards the top plate 400, at which time the continuous jacking jacks 510 retract to reduce the support force on the top plate 400, so that the top plate 400 moves backward under the pushing of the guide beam 200, and the resistance of the top plate 400 on the guide beam 200 is reduced, so that the guide beam 200 moves backward on the main beam 100 under the tightening force of the buckle cable 620; the two continuous jacking jacks 510 on the same main beam 100 work alternately to control the guide beam 200 and the top plate 400 to slide uniformly on the main beam 100, until the guide beam 200 is completely slid onto the main beam 100 as shown in Figure 6 .

[0037] Further, in order to ensure that the guide beam 200 can slide smoothly on the main beam 100, as shown in Figures 3 to 5As shown, the present application realizes the sliding fit between the guide beam 200 and the main beam 100 by setting the sliding protrusions 710 and the sliding grooves 720. The sliding protrusions 710 extending along the length direction of the main beam 100 are set on the top of the main beam 100, and the sliding grooves 720 extending along the length direction of the guide beam 200 are set on the bottom of the guide beam 200, and the sliding protrusions 710 and the sliding grooves 720 are in sliding fit. When the guide beam 200 is lifted to the level of the top of the main beam 100 by the lifting of the lifting jack 520, the sliding grooves 720 on the bottom of the guide beam 200 are aligned with the sliding protrusions 710 on the top of the main beam 100, and then the sliding protrusions 710 are inserted into the corresponding sliding grooves 720 under the tension 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 the sliding protrusions 710 and the sliding grooves 720 can be increased.

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

Claims

1. A method for overall removal of a front girder before the construction of a cable-stayed buckle hanging method, characterized in that: The method comprises the following steps: Step S1, installing an ear plate (300) at the connecting end of the main beam (100) and the guide beam (200), the opposite surfaces of the ear plate (300) are provided with a concave-convex structure, the extension 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 oppositely arranged in a staggered manner; Step S2, pushing the main beam (100) into place through the incremental launching construction, 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), the top plate (400) has the same concave-convex structure as the ear plate (300), the top plate (400) is arranged perpendicularly to the main beam (100), 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 buckle cable (620) on the buckle tower (610) to the end of the guide beam (200) away from the main beam (100), and tightening the buckle cable (620); Step S5, lifting the end of the guide beam (200) close to the main beam (100) through the jacking jack (520), and simultaneously tightening and retracting the buckle cable (620), so that the guide beam (200) is lifted to keep horizontal and is lifted to the bottom elevation of the guide beam (200) consistent with the top elevation of the main beam (100); Step S6, retracting the continuous jack (510) and moving the continuous jack (510) backward on the main beam (100) to make the guide beam (200) slide along the main beam (100) until the guide beam (200) is completely slid onto the main beam (100); Step S7, removing the buckle cable (620), and sliding the guide beam (200) from the main beam (100) to the rear to complete the removal of the entire guide beam (200).

2. The method according to claim 1, wherein the method is characterized by: In the step S1, one ear plate (300) is installed on each side of the connecting 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 close to the two side edges of the top plate (400), and the concave-convex structures on the two side edges of the top plate (400) oppositely correspond to the concave-convex structures on the ear plates (300) on the two sides of the end of the guide beam (200).

3. The method for overall removal of the guide beam before jacking construction using the inclined-stayed and hooked method as described in claim 1, characterized in that: In the step S3, two continuous jacks (510) are arranged on each main beam (100) to support the top plate (400); in the step S6, the two continuous jacks (510) on the same main beam (100) work alternately.

4. The method of claim 1, wherein the method further comprises: In the step S6, at least one sliding convex strip (710) extending along the length direction of the main beam (100) is arranged on the top of the main beam (100), and at least one sliding concave groove (720) extending along the length direction of the guide beam (200) is arranged on the bottom of the guide beam (200), and the sliding convex strip (710) and the sliding concave groove (720) are in sliding fit.

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