Construction method of highway reconstruction and expansion inclined leg rigid frame overpass bridge demolition system

Abstract

The present application relates to a kind of highway reconstruction inclined leg rigid frame overpass bridge dismantling system construction method, comprising the following steps: carrying out dismantling operation to concrete guardrail;In the middle and one side 1 / 4 span, setting up shaped assembly support;The upper and lower ends of inclined leg are cut off and separated, are transported away from construction site by temporary fixing protection support of inclined leg;Main beam section is segmented and hoisted away by section hoisting auxiliary bracket.The beneficial effects of the present application are: mobile protection platform is arranged below the main beam of inclined leg rigid frame bridge, effectively ensuring the safety of concrete guardrail and main beam during cutting, reducing the influence of construction activities on existing traffic;When main beam is cut, temporary support and fixation are carried out using shaped assembly support, the support is designed using modular unit, adjacent units are fixed by connecting steel, which improves the efficiency of site setting and engineering applicability.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of highway reconstruction and extension cross-line bridge demolition construction, and particularly relates to a construction method of a highway reconstruction and extension cross-line bridge demolition system. BACKGROUND

[0002] During highway reconstruction and extension construction, the cross-line bridges along the line need to be demolished. The traditional construction method is to erect a temporary support frame under the bridge, then cut the main beam in sections and hoist it away from the site, and finally demolish the bridge piers. For cross-line bridges, in order to reduce the impact of construction activities on existing road traffic, the method of sub-range construction and segmented demolition is usually adopted, but for inclined leg rigid frame bridges, it is difficult to adopt the sub-range construction method because there are no piers in the middle part. In addition, for inclined leg rigid frame bridges, the legs are inclined, and bending may occur during demolition, thereby endangering the safety of workers. SUMMARY

[0003] The purpose of the present application is to overcome the shortcomings of the prior art and provide a construction method of a highway reconstruction and extension inclined leg rigid frame cross-line bridge demolition system.

[0004] The construction method of the highway reconstruction and extension inclined leg rigid frame cross-line bridge demolition system comprises the following construction steps:

[0005] Step one, a mobile protective platform is erected on the main beam, the telescopic support rod and the work platform thereon are hoisted to the lower surface of the main beam, and the concrete guardrail is removed;

[0006] Step two, a shaped assembly support is erected at the middle and one-quarter span of the bridge, and a hydraulic jack is placed on the lower surface of the main beam;

[0007] Step three, the hydraulic support rod of the inclined leg temporary fixed protection support is adjusted to fix the inclined leg and the support plate;

[0008] Step four, the upper and lower ends of the inclined leg are cut and separated, then the hydraulic support rod is retracted to make the inclined leg fall on the support plate, and the inclined leg temporary fixed protection support is transported away from the construction site;

[0009] Step five, the main beam is cut at the middle and one-quarter span of the bridge to obtain two one-quarter span main beam segments, and the main beam segments are hoisted away in sections by the segment hoisting auxiliary bracket;

[0010] Step six, the other side inclined leg and the main beam are demolished according to steps two to five.

[0011] As preferred, the mobile protection platform comprises a support pulley, a vertical support rod, a telescopic boom, a lifting rope, a telescopic support rod and a working platform, the support pulley is fixed at the bottom of the vertical support rod, and the telescopic boom is horizontally fixed at the upper end of the vertical support rod; the working platform is arranged on the telescopic support rod, the upper end of the lifting rope is hung on the telescopic boom, and the lower end is hung on the telescopic support rod, and the telescopic support rod and the working platform thereon are lifted to below the main beam; the working platform is used as a protection structure to perform the removal operation on the concrete guardrails on both sides of the main beam, and the removal operation of the concrete guardrails is performed from the abutment at one end of the skew leg steel structure bridge to the abutment at the other end.

[0012] As preferred, in step two, first, a steel pad and a sand bag are laid on the ground, then the shaped assembly support is placed on the sand bag, the shaped assembly support comprises a unit support section steel, a unit support truss, a hydraulic jack and a connecting section steel, the connecting section steel is arranged on both sides of the unit support section steel at the same span, and the connecting section steel is fixed by using the tensioning screw rod, then the unit support truss is fixed on the unit support section steel, and the hydraulic jack on the unit support truss is adjusted to be in abutment with the lower surface of the main beam.

[0013] As preferred, the skew leg temporary fixed protection support comprises a base, a support plate and a hydraulic support rod, the base, the support plate and the hydraulic support rod are hingedly connected to form a triangular structure, and a mobile pulley is arranged below the base; a rubber pad is arranged on the support plate; in step three, the hydraulic support rod of the skew leg temporary fixed protection support is adjusted so that the rubber pad is in abutment with the surface of the skew leg, then a drill hole is arranged on the skew leg, and the drill hole is fixed by passing through the fixed bolt.

[0014] As preferred, in step five, the segment lifting auxiliary bracket comprises a longitudinal support rod and a transverse distribution rod, the transverse distribution rod and the longitudinal support rod are fixed perpendicularly to each other, and a supporting leg is arranged below the longitudinal support rod; the steel cable is tied to the lifting ring and the segment lifting auxiliary bracket is lifted until the transverse distribution rod is supported on the lower surface of the main beam; the main beam segment is lifted away by the segment lifting auxiliary bracket, and the supporting leg is used for supporting when the main beam segment is lowered.

[0015] As preferred, two hydraulic jacks are arranged on the top of the shaped assembly support along the span direction of the main beam, and when the main beam is cut, the cutting line is between the two hydraulic jacks on the top of the shaped assembly support, so that one hydraulic jack is arranged below the main beam at each end of the cutting line.

[0016] The highway reconstruction and expansion skew leg rigid structure overpass bridge removal system is obtained by any of the above methods.

[0017] The beneficial effects of the present application are:

[0018] 1) The mobile protection platform is arranged below the main beam of the skew leg rigid structure bridge, which effectively ensures the safety of the concrete guardrails and the main beam during the cutting period, and reduces the influence of the construction activities on the existing traffic.

[0019] 2) Main beam cutting, using a standardized assembly support for temporary support and fixation, the support uses modular unit design, adjacent units are connected and fixed by connecting steel, which improves the efficiency of site erection and engineering applicability.

[0020] 3) Main beam segment hoisting adopts segment hoisting auxiliary bracket, which effectively ensures the stability of hoisting components and improves the efficiency of hoisting construction.

[0021] 4) The inclined leg of the rigid frame bridge is temporarily fixed by using inclined leg temporary fixing protection support, which avoids the sudden fracture of the inclined leg during cutting, resulting in personnel casualties, and has high safety. After the inclined leg is cut, it is placed on the inclined leg temporary fixing protection support by hydraulic support rod, which is convenient for transportation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a longitudinal view of the highway reconstruction and expansion inclined leg rigid frame overpass bridge demolition system;

[0023] Figure 2 is a horizontal view of the highway reconstruction and expansion inclined leg rigid frame overpass bridge demolition system;

[0024] Figure 3 is a schematic diagram of the upper support structure of the mobile protection platform;

[0025] Figure 4 is a schematic diagram of the connecting rod;

[0026] Figure 5 is a schematic diagram of the lower operation platform structure of the mobile protection platform;

[0027] Figure 6 is a longitudinal view of the standardized assembly support;

[0028] Figure 7 is a horizontal view of the standardized assembly support;

[0029] Figure 8 is a schematic diagram of the inclined leg temporary fixing protection support when it is expanded;

[0030] Figure 9 is a schematic diagram of the inclined leg temporary fixing protection support when it is contracted (II);

[0031] Figure 10 is a schematic diagram of main beam segment cutting and hoisting operation;

[0032] Figure 11 is a schematic diagram of main beam segment cutting and hoisting operation Figure Two ;

[0033] Figure 12 is a construction drawing of the main beam segment hoisting auxiliary bracket.

[0034] Legend: 11 - abutment, 12 - main girder, 13 - inclined leg, 14 - concrete guardrail, 21 - support pulley, 22 - connecting rod, 23 - vertical support rod, 24 - telescopic lifting rod, 25 - lifting rope, 26 - telescopic support rod, 27 - distribution rod, 28 - working platform, 29 - guardrail, 31 - steel pad, 32 - sand bag, 33 - unit support steel, 34 - unit support truss, 35 - hydraulic jack, 36 - connecting steel, 37 - tensioning screw, 41 - longitudinal support rod, 42 - support foot, 43 - lifting ring, 44 - steel cable, 45 - transverse distribution rod, 51 - base, 52 - moving pulley, 53 - support plate, 54 - rubber pad, 55 - fixing bolt, 56 - hydraulic support rod. DETAILED DESCRIPTION

[0035] The application will be further described below in conjunction with examples. The following examples are only used to help understand the application. It should be pointed out that for those skilled in the art, some modifications can be made to the application without departing from the principles of the application, and these modifications and improvements also fall within the protection scope of the claims of the application.

[0036] Example 1

[0037] As an example, the construction method of the highway reconstruction inclined leg rigid frame overpass bridge dismantling system comprises the following construction steps:

[0038] Step one, close the traffic on the overpass inclined leg rigid frame bridge, set up a moving protection platform on the inclined leg rigid frame bridge, connect and fix the vertical support rod 23 using the connecting rod 22, set up the working platform 28 on the telescopic support rod 26, hang the upper end of the lifting rope 25 on the telescopic lifting rod 24 and the lower end on the telescopic support rod 26, and hoist the telescopic support rod 26 and the working platform 28 thereon to the lower side of the main girder 12; use the working platform 28 as a protection structure to carry out the dismantling operation of the concrete guardrail 14 on both sides of the main girder 12, and the concrete guardrail 14 dismantling operation is carried out from the abutment 11 at one end of the inclined leg rigid frame bridge to the abutment 11 at the other end.

[0039] Step two, level the ground, set up a shaped assembled support at the midspan and one side 1 / 4 span, lay the steel pad 31 and sand bag 32 on the ground, then place the unit support steel 33 on the sand bag 32, place the connecting steel 36 on both sides of the unit support steel 33 at the same span, use the tensioning screw 37 to tension and fix the connecting steel 36, then fix the unit support truss 34 on the unit support steel 33, and adjust the hydraulic jack 35 on the unit support truss 34 to make it top the lower surface of the main girder 12;

[0040] Step three, adjust the hydraulic support rod 56 of the temporary protection support of the inclined leg, so that the rubber pad 54 is close to the surface of the inclined leg 13, then drill holes on the inclined leg 13, and pass the fixing bolts 55 through the holes on the inclined leg 13 and the support plate 53 and tighten them;

[0041] Step four, cut close to the upper end and the lower end of the inclined leg 13 to separate the inclined leg 13 from the main beam 12 at the upper end and the foundation at the lower end, then retract the hydraulic support rod 56 to support the inclined leg 13 on the support plate 53, and then remove the inclined leg 13 and the temporary protection support of the inclined leg from the construction site;

[0042] Step five, cut the main beam 12 at the middle of the span to cut the main beam 12 into two halves, then cut the main beam 12 again at 1 / 4 of the span on one side of the main beam 12 to cut the main beam 12 into 1 / 4-span segments, tie the steel cable 44 to the lifting ring 43 and lift the segment hoisting auxiliary bracket close to the lower side of the main beam 2 segment, and hoist the main beam 12 segments away through the segment hoisting auxiliary bracket;

[0043] Step six, according to the method described in steps two to five, the other side inclined leg 13 and the main beam 12 are removed.

[0044] Example two

[0045] As another embodiment, the method of example one obtains a highway reconstruction and expansion inclined leg rigid frame overpass bridge removal system, which includes a mobile protection platform, a standardized assembly support, a segment hoisting auxiliary bracket, and a temporary protection support of the inclined leg; the two ends of the main beam 12 are arranged on the abutment 11, and the inclined leg 13 is arranged below the two ends of the main beam 12.

[0046] The mobile protection platform includes a support pulley 21, a vertical support rod 23, an extension lifting rod 24, a lifting rope 25, an extension support rod 26, a work platform 28, the support pulley 21 is fixed at the bottom of the vertical support rod 23, the extension lifting rod 24 is vertically fixed at the upper end of the vertical support rod 23, the upper end of the lifting rope 25 is tied to the extension lifting rod 24, the lower end of the lifting rope 25 is tied to the extension support rod 26, the extension support rod 26 is suspended below the main beam 12, a distribution rod 27 is vertically fixed with the extension support rod 26, and the work platform 28 is placed on the distribution rod 27; the vertical support rod 23 is fixed by a connecting rod 22 to ensure the stability of the vertical support rod 23, and guardrails 29 are arranged around the work platform 28 to prevent workers from falling off the work platform 28.

[0047] The standardized assembled support includes unit support section steel 33, unit support truss 34, hydraulic jack 35, connecting section steel 36, the unit support truss 34 is fixedly installed on the unit support section steel 33 at the lower end, and the upper end is provided with the hydraulic jack 35, the hydraulic jack 35 is supported on the lower surface of the main beam 12, the connecting section steel 36 passes through the unit support section steel 33 to connect a plurality of unit support section steels 33 in series into a whole;The connecting section steel 36 is arranged in pairs on the two sides of the unit support section steel 33, and the connecting section steel 36 is fixed by using the tensioning screw rod 37.

[0048] The segment hoisting auxiliary bracket includes longitudinal support rod 41 and transverse distribution rod 45, the transverse distribution rod 45 is fixed vertically on the longitudinal support rod 41, and the transverse distribution rod 45 is closely attached to the lower surface of the main beam 12;The longitudinal support rod 41 is provided with a supporting leg 42 below, so that the hoisted main beam 12 segment together with the bracket is hoisted and placed on the ground as a whole. The end of the longitudinal support rod 41 is provided with a lifting ring 43, and the steel cable 44 of the lifting device is fixed on the lifting ring 43.

[0049] The unit support section steel 33 is provided with a steel base plate 31 and a sand bag 32 below, the unit support section steel 33 is supported on the sand bag 32, the sand bag 32 is supported on the steel base plate 31, and the steel base plate 31 is supported on the ground, and the sand bag 32 and the steel base plate 31 are arranged to adapt to the uneven ground.

[0050] The inclined leg temporary fixing protection support includes base 51, support plate 53, hydraulic support rod 56, fixing bolt 55, the base 51, support plate 53 and hydraulic support rod 56 are hingedly connected, and the support plate 53 is closely attached to the surface of the inclined leg 13 and is fixed thereto by using the fixing bolt 55.

[0051] The base 51 is provided with a moving pulley 52 below, so that the inclined leg 13 is convenient to transport after being removed;The support plate 53 is provided with a rubber pad 54, so as to improve the contact area and friction force between the support plate 53 and the inclined leg 13.

[0052] It should be noted that the same or similar parts in the embodiment can be mutually referred to, and will not be described in detail in the application.

[0053] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between various embodiments can be mutually referred to.

Claims

1. A construction method of a highway reconstruction and expansion skew leg rigid frame overpass bridge demolition system, characterized in that, The method comprises the following steps: Step one, a movable protection platform is set up on the main beam, the movable protection platform comprises a support pulley, a vertical support rod, an extensible hoisting rod, a hoisting rope, an extensible support rod and a working platform, the support pulley is fixed at the bottom of the vertical support rod, and the extensible hoisting rod is horizontally fixed at the upper end of the vertical support rod; the working platform is set up on the extensible support rod, the upper end of the hoisting rope is hung on the extensible hoisting rod, and the lower end of the hoisting rope is hung on the extensible support rod, and the extensible support rod and the working platform thereon are hoisted to the lower side of the main beam; the working platform is used as a protection structure to remove the concrete guardrails on both sides of the main beam, the concrete guardrails are removed from the abutment at one end of the diagonal leg rigid frame bridge to the abutment at the other end of the diagonal leg rigid frame bridge, the extensible support rod and the working platform thereon are hoisted to the lower side of the main beam; the concrete guardrails are removed; Step two, a shaped assembly support is set up at the midspan and the 1 / 4 span of one side, and a hydraulic jack is jacked against the lower surface of the main beam; Step three, the diagonal leg temporary fixed protection support comprises a base, a support plate and a hydraulic support rod, the base, the support plate and the hydraulic support rod are hingedly connected to form a triangular structure, and a movable pulley is arranged below the base; a rubber pad is arranged on the support plate; the hydraulic support rod of the diagonal leg temporary fixed protection support is adjusted so that the rubber pad is attached to the surface of the diagonal leg, then a drill hole is arranged on the diagonal leg, and the diagonal leg and the support plate are fixed through the drill hole and a fixing bolt; Step four, the upper end and the lower end of the diagonal leg are cut and separated, then the hydraulic support rod is retracted so that the diagonal leg is laid on the support plate, and the diagonal leg temporary fixed protection support is transported away from the construction site; Step five, the main beam is cut at the midspan and the 1 / 4 span of one side, two 1 / 4-span main beam segments are obtained, and the main beam segments are hoisted away in sections through a segment hoisting auxiliary bracket; Step six, the diagonal leg and the main beam on the other side are removed according to steps two to five.

2. The construction method of the highway reconstruction skew leg rigid frame overpass bridge dismantling system according to claim 1, characterized in that, In step two, first, a steel pad and a sand bag are laid on the ground, then the shaped assembly support is placed on the sand bag, the shaped assembly support comprises a unit support section steel, a unit support truss, a hydraulic jack and a connecting section steel, the connecting section steel is arranged on the two sides of the unit support section steel at the same span, the connecting section steel is fixed by using a tensioning screw, then the unit support truss is fixed on the unit support section steel, and the hydraulic jack on the unit support truss is adjusted so that the hydraulic jack is jacked against the lower surface of the main beam.

3. The construction method of the highway reconstruction skew leg rigid frame overpass bridge dismantling system according to claim 1, characterized in that, In step five, the segment hoisting auxiliary bracket comprises a longitudinal support rod and a transverse distribution rod, the transverse distribution rod and the longitudinal support rod are fixed perpendicular to each other, and a support foot is arranged below the longitudinal support rod; a steel cable is tied to a lifting ring and the segment hoisting auxiliary bracket is hoisted until the transverse distribution rod is supported on the lower surface of the main beam; the main beam segments are hoisted away in sections through the segment hoisting auxiliary bracket, and the support foot is used for supporting when the main beam segments are lowered.

4. The construction method of the highway reconstruction skew leg rigid frame overpass bridge demolition system according to claim 1, characterized in that, The two hydraulic jacks at the top of the shaped assembly support are arranged in the direction of the main beam span, when the main beam is cut, the cutting line is between the two hydraulic jacks at the top of the shaped assembly support, and one hydraulic jack is arranged below each end of the cutting line.

5. A highway reconstruction and expansion skew leg rigid frame overpass bridge demolition system, characterized in that, The method is obtained by any one of claims 1 to 4.

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