Construction method of highway reconstruction and expansion cross-line continuous beam bridge demolition system

Abstract

The present application relates to a kind of highway reconstruction and expansion cross-line continuous beam bridge demolition system construction method, support is formed by setting anchor bolt, pouring micro-expansion concrete, supporting steel etc. at support, and support rigid anchoring structure is formed, main beam and bent cap are anchored into a whole, movable support structure is changed into rigid structure, and the stability before main beam is demolished is improved;The main beam of the proposed standardization mobile support frame can assist support to the main beam in cantilever state at the disconnected place, avoid the overall overturning of main beam and the large negative bending moment at support point;Pier column is supported and fixed using bending-resistant support, which is simple and reliable in structure, effectively avoiding the risk of bending and breaking of pier column during the demolition of main beam;The demolition operation adopts the way of sectional operation and sectional hoisting, and the upward force is applied in advance by protective hoisting support when the hoisted segment is hoisted, to avoid the impact force generated by sudden falling when segment is cut, and the safety of on-site operation is improved.

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 continuous beam bridge demolition system. BACKGROUND

[0002] With the rapid development of social economy, the traffic volume has also experienced a greater growth, and the existing road network is difficult to bear the existing traffic flow, so it is urgently needed to upgrade and transform the existing highway. When the highway is reconstructed and extended, some existing cross-line bridges need to be demolished. Cast-in-place concrete continuous beam bridges are widely used in cross-line bridges due to their good bearing capacity. However, due to the large span and continuous beam body, improper operation during demolition can easily cause overall collapse, pier column toppling and other risks, endangering the safety of operating personnel and construction machinery and equipment. Therefore, how to safely and efficiently demolish the cross-line continuous beam bridge and quickly hoist and transport the demolished main beam and pier column segments out of the construction site has become the key to highway reconstruction and extension. SUMMARY

[0003] The purpose of the present application is to overcome the deficiencies in the prior art and provide a construction method of a highway reconstruction and extension cross-line continuous beam bridge demolition system.

[0004] The construction method of the highway reconstruction and extension cross-line continuous beam bridge demolition system comprises the following construction steps:

[0005] Step one, a support rigid anchoring structure is arranged between the main beam and the bent cap, the anchor bolt is anchored in the bent cap through the main beam bottom plate, a ring hoop is arranged on the support, and a horizontal support steel is inserted into the gap between the main beam and the bent cap;

[0006] Step two, a support steel plate is laid on the ground, a pier column bending-resistant support frame is erected below the bent cap, and a main beam shaped mobile support frame is supported on the lower surface of the main beam;

[0007] Step three, the guardrail and the wing plate are hoisted away in sections by using a protective hoisting support frame;

[0008] Step four, the protective hoisting support frame hoists the main beam away in sections symmetrically with the pier column as the axis; the main beam shaped mobile support frame is moved synchronously until the main beams on both sides of the pier column are all hoisted away;

[0009] Step five, the remaining main beam and bent cap above the pier column are hoisted by using the protective hoisting support frame.

[0010] As preferred, in step one, the support rigid anchoring structure comprises anchor bolts, ring hoops and horizontal support steel, the anchor bolts are punched down on the main beam bottom plate and anchored in the cap beam, the ring hoops are sleeved on the support, and micro-expansion concrete is injected into the ring hoops; the horizontal support steel is inserted into the gap between the main beam and the cap beam, and inclined support steels are welded at both ends of the horizontal support steel.

[0011] As preferred, in step two, the pier bending-resistant support comprises upper hoops, hydraulic jacks, counterweights, lower hoops, inclined support rods, pull rods and support feet, the support feet are arranged on the support steel plates, the upper hoops are sleeved on the upper end of the pier, the lower hoops are sleeved on the lower end of the pier, the inclined support rods and the pull rods are hingedly connected with the upper hoops and the lower hoops respectively, the other ends of the inclined support rods and the pull rods are hingedly connected at the support feet, the support plates are arranged on the upper hoops, the hydraulic jacks are supported on the support plates at the lower ends and on the lower surface of the cap beam at the upper ends, and the counterweights are hung on the upper hoops.

[0012] As preferred, in step two, the main beam shaping mobile support frame is symmetrically arranged on both sides of the bridge span center line, the main beam shaping mobile support frame comprises a support truss, a pulley support foot, a first-stage platform and a second-stage platform, the pulley support foot is fixed at the bottom of the support truss, the support truss is provided with the first-stage platform, the long-distance jacks are installed on the first-stage platform, the second-stage platform is supported on the long-distance jacks, the second-stage platform is provided with short-distance jacks and guide pulleys, and the short-distance jacks and the guide pulleys are supported on the lower surface of the main beam; the support truss is provided with foundation bolts below, the foundation bolts pass through the support steel plates and are anchored in the soil, and the support truss is provided with wind cables at the top, the main beam shaping mobile support frame is transversely fixed through the foundation bolts and the wind cables, then the long-distance jacks and the short-distance jacks are adjusted, and the short-distance jacks are supported on the lower surface of the main beam.

[0013] As preferred, the protection hoisting support frame comprises hoisting ropes, hooks, connecting rods, upper crossbeams, support springs and lower crossbeams, the hooks pass through the hoisting holes arranged on the wing plates or the main beam segments to be hoisted, the hooks below the wing plates or the main beams pass through the connecting rods, the upper crossbeams, the support springs and the lower crossbeams in sequence, and the hooks above the connecting rods are provided with washers.

[0014] As preferred, when the protection hoisting support frame hoists the concrete guardrail segments, horizontal hoisting holes are punched on the guardrails, the hoisting ropes are inserted into the concrete guardrails and fixed on the connecting rods at both ends, the protection hoisting support frame is lifted upward by the hoisting machine, an upward force is pre-applied to the guardrail segments, then the guardrail segments are cut along the bottom of the guardrails and hoisted away.

[0015] As preferred, the wing plate is cut into several segments along the longitudinal direction, and vertical lifting holes are punched on the wing plate, hooks are inserted into the lifting holes in sequence, and connecting rods, upper cross beams, supporting springs and lower cross beams are inserted in sequence, and washers are sleeved on the hooks, the washers are supported between the connecting rods and the lower surface of the wing plate, and then the protective lifting support is lifted upward by the crane to pre-apply an upward force to the wing plate segments, and then the wing plate segments are cut along the root of the wing plate and lifted away.

[0016] As preferred, after cutting and lifting one segment of the main beam, the short-range jack is retracted to support the main beam by the guide pulley, the anchor bolts and wind cables are removed, the main beam is shaped, the moving support frame is moved backward by a distance of one segment, the anchor bolts and wind cables are fixed, the short-range jack is extended to support the main beam, and then the cutting and lifting of the next segment of the main beam are performed; the above steps are repeated until the cutting and lifting of the segments of the main beam on both sides of the pier column are completed.

[0017] As preferred, in step five, the protective lifting support is installed on the remaining segment of the main beam above the pier column, then the pier column is cut along the lower surface of the cap beam, and the remaining segment of the main beam above the pier column is lifted away together with the cap beam; then the pier column bending resistance support on the pier column is removed, the pier column is cut along the lower end, and the cut pier column is removed.

[0018] The highway reconstruction and expansion continuous beam bridge dismantling system is obtained by any of the above methods.

[0019] The beneficial effects of the present application are:

[0020] 1) The anchor bolts, micro-expansion concrete and supporting steel are arranged at the support to form a rigid anchoring structure of the support, the main beam and the cap beam are anchored as a whole, the movable support structure is changed into a rigid structure, and the stability of the main beam before dismantling is improved.

[0021] 2) The main beam shaping moving support frame is proposed to assist in supporting the main beam in a cantilever state at the cut-off position, so as to avoid the overall overturning of the main beam and the generation of a large negative bending moment at the support point.

[0022] 3) The pier column is supported and fixed by the bending resistance support, the structure is simple and reliable, and the risk of bending and breaking of the pier column during the dismantling of the main beam is effectively avoided.

[0023] 4) The dismantling operation adopts the mode of segmented operation and segmented lifting, the upward force is pre-applied to the lifted segment by the protective lifting support, the impact force generated by the sudden falling of the segment during cutting is avoided, and the safety of the on-site operation is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic view of the dismantling construction of the guardrail and the wing plate;

[0025] Figure 2 isFigure 1 Supporting rigid anchoring structure of middle A node;

[0026] Figure 3 is a side view of guardrail removal construction;

[0027] Figure 4 Main beam shaping mobile support frame and pier column bending resistance support working state structure schematic diagram;

[0028] Figure 5 is a schematic diagram of main beam sectional cutting protection hoisting frame installation structure;

[0029] Figure 6 is a schematic diagram of main beam sectional cutting and hoisting construction;

[0030] Figure 7 Pier column bending resistance support installation in place structure schematic diagram;

[0031] Figure 8 is a schematic diagram of pier column cutting and bent cap removal construction before construction;

[0032] Figure 9 is a schematic diagram of pier column cutting and bent cap removal construction during construction;

[0033] Figure 10 is a schematic diagram of main beam shaping mobile support frame structure;

[0034] Figure 11 is a schematic diagram of protection hoisting support frame hoisting main beam section.

[0035] In the figure: 11-main beam, 12-guardrail, 13-wing plate, 14-supporting seat, 15-bent cap, 16-pier column, 17-cutting seam, 18-supporting steel plate, 2-supporting rigid anchoring structure, 21-anchoring bolt, 22-micro-expansion concrete, 23-ring hoop, 24-horizontal supporting steel, 25-inclined supporting steel, 3-protection hoisting support frame, 31-hoisting rope, 32-hoisting hook, 33-washer, 34-coupling rod, 35-upper cross beam, 36-supporting spring, 37-lower cross beam, 4-main beam shaping mobile support frame, 41-supporting truss, 42-pulley support foot, 43-first stage platform, 44-long distance jack, 45-second stage platform, 46-short distance jack, 47-moisture-increasing rubber pad, 48-guiding pulley, 49-ground bolt, 410-wind cable, 5-pier column bending resistance support, 51-upper hoop, 52-supporting plate, 53-hydraulic jack, 54-counterweight, 55-lower hoop, 56-inclined supporting rod, 57-pull rod, 58-support foot. DETAILED DESCRIPTION

[0036] The application will be further described in connection with the following examples. The following examples are intended to help understand the application. It should be noted that for those skilled in the art, several modifications can be made to the application without departing from the principles of the application, and these improvements and modifications also fall within the scope of the claims of the application.

[0037] Example 1

[0038] As an embodiment, the construction method of the highway reconstruction and expansion cross-line continuous beam bridge demolition system comprises the following construction steps:

[0039] Step 1: Anchor bolts 21 are punched into the bottom plate of the main beam 11 downward, the anchor bolts 21 are anchored in the bent cap 15 through the bottom plate of the main beam 11, the ring hoop 23 is sleeved on the support 14, and the micro-expanding concrete 22 is injected into the ring hoop 23; the horizontal support steel 24 is inserted into the gap between the main beam 11 and the bent cap 15, and the inclined support steel 25 is welded at both ends of the horizontal support steel 24.

[0040] Step 2: The ground under the main beam 11 and the pier 16 is leveled and the support steel plate 18 is laid on the ground, and the main beam shaping mobile support frame 4 and the pier bending resistance support frame 5 are erected; the upper hoop 51 and the lower hoop 55 are sleeved on the pier 16, the inclined support rod 56 and the pull rod 57 are hingedly connected with the upper hoop 51 and the lower hoop 55, the hydraulic jack 53 is installed on the support plate 52 of the upper hoop 51, and the counterweight 54 is hung on the upper hoop 51; the main beam shaping mobile support frame 4 is symmetrically erected on both sides of the bridge span center line, the anchor bolt 49 and the wind cable 410 are installed for transverse fixation, then the long-distance jack 44 and the short-distance jack 46 are adjusted, and the short-distance jack 46 is supported on the lower surface of the main beam 11.

[0041] Step 3: The guardrail 12 is cut into segments along the longitudinal direction, horizontal lifting holes are punched on the guardrail 12, the lifting rope 31 is passed through the lifting holes and fixed on the connecting rod 34, the protection lifting support 3 is lifted upward by the crane, an upward force is pre-applied to the guardrail 12 segment to be cut and lifted, then the guardrail 12 is cut along the bottom and lifted away.

[0042] After the guardrail 12 is removed, the wing plate 13 is cut into segments along the longitudinal direction, vertical lifting holes are punched on the wing plate 13, the lifting hook 32 is passed through the lifting holes and sequentially inserted into the connecting rod 34, the upper cross beam 35, the support spring 36, and the lower cross beam 37, the washer 33 is sleeved on the lifting hook 32, the washer 33 is supported between the connecting rod 34 and the lower surface of the wing plate 13, then the protection lifting support 3 is lifted upward by the crane, an upward force is pre-applied to the wing plate 13 segment to be cut and lifted, then the wing plate 13 is cut along the root and lifted away.

[0043] Step four, cutting the main girder 11, the cutting seam 17 is located at the midspan of the main girder 11, cutting the main girder 11 from the continuous system into the cantilever system, and the cantilever end is supported on the main girder shaping mobile support frame 4;

[0044] The vertical lifting holes are punched on the top plate of the main girder 11, the lifting hooks 32 pass through the lifting holes and are sequentially inserted into the connecting rod 34, the upper cross beam 35, the supporting spring 36, and the lower cross beam 37, and then the protective lifting support 3 is lifted upward by the crane to pre-apply an upward force to the main girder 11 segment to be cut and lifted, and then cutting and lifting along the main girder 11 segment division line, the main girder 11 cutting and lifting operation is symmetrically performed around the pier column.

[0045] After the main girder 11 is cut and lifted for one segment, the short-distance jack 46 is retracted to support the main girder 11 by the guide pulley 48, the foundation bolt 49 and the wind cable 410 are removed, the main girder shaping mobile support frame 4 is moved backward by a distance of one segment, the foundation bolt 49 and the wind cable 410 are fixed, the short-distance jack 46 is extended to support the main girder 11, and the next main girder 11 segment cutting and lifting operation is performed according to the method described in step 6; repeat the above steps until the main girder 11 segment cutting and lifting operation on both sides of the pier column 16 is completed.

[0046] Step five, installing the protective lifting support 3 on the remaining main girder 11 segment above the pier column 16, then cutting the pier column 16 along the lower surface of the cap beam 15, and lifting the remaining main girder 11 segment above the pier column 16 together with the cap beam 15;

[0047] Removing the pier column bending resistance support 5 on the pier column 16, cutting along the lower end of the pier column 16, and removing the cut-down pier column 16.

[0048] Example two

[0049] As another embodiment, the method described in example one obtains a highway reconstruction and expansion overline continuous girder bridge dismantling system, as shown in Figures 1 to 11 , which includes the support rigid anchoring structure 2, the protective lifting support 3, the main girder shaping mobile support frame 4, and the pier column bending resistance support 5; the main girder 11 is sequentially supported by the support 14, the cap beam 15, and the pier column 16 below;

[0050] The support rigid anchoring structure 2 comprises an anchor bolt 21, a ring hoop 23, a horizontal support steel 24, the anchor bolt 21 is implanted into the bent cap 15 through the bottom plate of the main girder 11, the ring hoop 23 is sleeved on the support 14, the ring hoop 23 is poured with micro-expansion concrete 22, the horizontal support steel 24 passes between the bent cap 15 and the main girder 11, the bending resistance of the main girder 11 at the support 14 is improved by connecting and anchoring the main girder 11 and the bent cap 15 and arranging the horizontal support steel 24, and the overturning of the main girder 11 before being removed is avoided; the end of the horizontal support steel 24 is provided with a diagonal support steel 25, the diagonal support steel 25 is diagonally anchored at the end of the horizontal support steel 24 and supported on the side of the bent cap 15, and the bending bearing capacity of the horizontal support steel 24 is improved.

[0051] The protective hoisting support 3 comprises a lifting rope 31, a lifting hook 32, a connecting rod 34, an upper cross beam 35, a supporting spring 36 and a lower cross beam 37, the lifting hook 32 passes through the hoisting hole arranged on the wing plate 13 or the main girder 11 segment to be hoisted, the lower end of the lifting hook 32 sequentially passes through the connecting rod 34, the upper cross beam 35, the supporting spring 36 and the lower cross beam 37, the component to be hoisted is provided with the protective hoisting support in advance, the lifting hook 32 is lifted and the supporting spring 36 is compressed through the lifting rope 31 when cutting, and an upward force is applied to the component to be hoisted in advance, so that the component to be hoisted does not suddenly fall when cutting, and the hoisting equipment, personnel and mechanical equipment below are not impacted or injured; the lifting hook 32 is provided with a gasket 33, and when the lower surface of the component to be hoisted is uneven, the gasket 33 is arranged on the lifting hook 32, so that the connecting rod 34 remains in a horizontal state.

[0052] When the protective hoisting support 3 hoists the concrete guardrail 12 segment, the lifting rope 31 is inserted into the concrete guardrail 12, and the two ends of the lifting rope 31 are fixed on the connecting rod 34.

[0053] The main girder shaping mobile support frame 4 comprises a support truss 41, a pulley support leg 42, a first-stage platform 43 and a second-stage platform 45, the pulley support leg 42 is fixed at the bottom of the support truss 41, the support truss 41 is provided with the first-stage platform 43, a long-distance jack 44 is installed on the first-stage platform 43, the second-stage platform 45 is supported on the long-distance jack 44, a short-distance jack 46 and a guide pulley 48 are arranged on the long-distance jack 44, the short-distance jack 46 and the guide pulley 48 are supported on the lower surface of the main girder 11, the adaptability of the main girder shaping mobile support frame 4 to main girders 11 of different heights is improved by arranging the long-distance jack 44 and the short-distance jack 46 on the upper end of the support truss 41; a foundation bolt 49 is arranged below the support truss 41, the foundation bolt 49 passes through the support steel plate 18 and is anchored in the soil, and a wind cable 410 is arranged at the top of the support truss 41; the stability of the main girder shaping mobile support frame 4 is improved by arranging the foundation bolt 49 and the wind cable 410, and the overall overturning and turning over of the main girder shaping mobile support frame 4 is avoided.

[0054] The upper end of the short distance jack 46 is provided with a friction increasing rubber pad 47 to increase the friction between the upper end of the short distance jack 46 and the lower surface of the main beam 11.

[0055] The pier column bending resistant support 5 comprises an upper hoop 51, a hydraulic jack 53, a counterweight 54, a lower hoop 55, an inclined support rod 56, and a pull rod 57. The upper hoop 51 is sleeved on the upper end of the pier column 16, the lower hoop 55 is sleeved on the lower end of the pier column 16, one end of the pull rod 57 is hinged to the lower hoop 55, one end of the inclined support rod 56 is hinged to the upper hoop 51, the other end of the pull rod 57 is hinged to the inclined support rod 56, and the upper hoop 51 is provided with a support plate 52. The lower end of the hydraulic jack 53 is supported on the support plate 52, and the upper end of the hydraulic jack 53 is supported on the lower surface of the bent cap 15. The counterweight 54 is hung on the upper hoop 51. By arranging the pier column bending resistant support 5, the bending resistance of the pier column 16 during the demolition process is improved, and the bending and breaking of the pier column 16 before the main beam 11 is demolished is avoided.

[0056] The ground under the main beam 11 is provided with a support steel plate 18, and the bottom of the inclined support rod 56 is provided with a support leg 58. The support leg 58 and the pulley support leg 42 are supported on the support steel plate 18, so that local subsidence of the support leg 58 and the pulley support leg 42 supported on the ground is avoided.

[0057] It should be noted that the same or similar parts in the embodiment and the first embodiment can be mutually referred to, and will not be described in detail in the present application.

[0058] The embodiments in the present specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be mutually referred to.

Claims

1. A construction method for demolishing a continuous beam bridge overpass during highway reconstruction and expansion, characterized in that, The construction steps include the following: Step 1: Install a rigid anchorage structure between the main beam and the cap beam. Anchor bolts pass through the bottom plate of the main beam and are anchored inside the cap beam. Install an annular clamp on the support and insert the horizontal support steel into the gap between the main beam and the cap beam. The rigid anchorage structure includes anchor bolts, an annular clamp, and horizontal support steel. Anchor bolts are driven downward into the bottom plate of the main beam and anchored through the bottom plate into the cap beam. The annular clamp is fitted onto the support, and micro-expansion concrete is injected into the annular clamp. The horizontal support steel is inserted into the gap between the main beam and the cap beam, and diagonal support steel is welded to both ends of the horizontal support steel. Step 2: Lay supporting steel plates on the ground, erect pier column bending-resistant supports under the cap beam, and erect a fixed mobile support frame for the main beam on the lower surface of the main beam. The pier column bending-resistant support frame includes an upper clamp, hydraulic jack, counterweight, lower clamp, diagonal support rod, tie rod, and support feet. The support feet are placed on the supporting steel plates. The upper clamp is fitted onto the upper end of the pier column, and the lower clamp is fitted onto the lower end of the pier column. The diagonal support rod and tie rod are hinged to the upper clamp and lower clamp respectively. The other end of the diagonal support rod and tie rod are hinged to the support feet. A support plate is provided on the upper clamp. The lower end of the hydraulic jack is supported on the support plate, and the upper end is supported on the lower surface of the cap beam. The counterweight is suspended on the upper clamp. The main beam is symmetrically erected on both sides of the bridge span centerline. The standardized mobile support frame for the main beam includes a support truss, pulley supports, a primary platform, and a secondary platform. The pulley supports are fixed to the bottom of the support truss. The primary platform is mounted on the support truss, and long-distance jacks are installed on the primary platform. The secondary platform is supported by the long-distance jacks and has short-distance jacks and guide pulleys. The short-distance jacks and guide pulleys support the lower surface of the main beam. Anchor bolts are installed below the support truss, passing through the support steel plate and anchored in the soil. Wind cables are installed at the top of the support truss. The standardized mobile support frame for the main beam is laterally fixed by the anchor bolts and wind cables. Then, the long-distance jacks and short-distance jacks are adjusted so that the short-distance jacks support the lower surface of the main beam. Step 3: Use a protective hoisting support frame to lift the guardrail and wing panels in sections. The protective hoisting support frame includes a hoisting rope, hook, connecting rod, upper crossbeam, support spring, and lower crossbeam. The hook passes through the hoisting hole opened on the wing panel or main beam segment to be hoisted. The hook below the wing panel or main beam passes through the connecting rod, upper crossbeam, support spring, and lower crossbeam in sequence. Washers are provided on the hooks above the connecting rods. During cutting, the hook is lifted by the hoisting rope and the support spring is compressed to apply an upward force to the component to be hoisted in advance to prevent it from falling suddenly during cutting. Step 4: The protective hoisting support is used to hoist the main beam in sections symmetrically with the pier as the axis; the fixed moving support frame of the main beam is moved simultaneously until the main beams on both sides of the pier are completely hoisted away; Step 5: Use the protective hoisting support to hoist the remaining main beams and cap beams above the pier.

2. The construction method for the demolition system of a continuous beam bridge overpass during highway reconstruction and expansion according to claim 1, characterized in that, When hoisting concrete guardrail segments using a protective hoisting scaffold, horizontal hoisting holes are drilled in the guardrail, hoisting ropes are threaded through the concrete guardrail, and the two ends of the hoisting ropes are fixed to the connecting rods. The protective hoisting scaffold is then lifted upwards using a crane to pre-apply an upward force to the guardrail segment. Finally, the guardrail segment is cut along its bottom and hoisted away.

3. The construction method for the demolition system of a continuous beam bridge overpass during highway reconstruction and expansion according to claim 1, characterized in that, The wing plate is cut longitudinally into several segments, and vertical lifting holes are drilled in the wing plate. The hook passes through the lifting holes and is inserted into the connecting rod, upper crossbeam, support spring and lower crossbeam in sequence. Washers are put on the hooks and supported between the connecting rods and the lower surface of the wing plate. Then, the protective lifting bracket is lifted upward by the crane, and an upward force is pre-applied to the wing plate segments. Then, the wing plate is cut along the root and lifted away.

4. The construction method for the demolition system of a continuous beam bridge overpass during highway reconstruction and expansion according to claim 1, characterized in that, After cutting and hoisting one segment of the main beam, the short-pitch jacks are retracted to support the main beam via guide pulleys. The anchor bolts and wind cables are removed, and the main beam's fixed movable support frame is moved backward by one segment. The anchor bolts and wind cables are then fixed, and the short-pitch jacks are extended to support the main beam. Then, the cutting and hoisting of the next segment of the main beam is carried out. The above steps are repeated until all the cutting and hoisting of the main beam segments on both sides of the pier are completed.

5. The construction method for the demolition system of a continuous beam bridge overpass during highway reconstruction and expansion according to claim 1, characterized in that, In step five, a protective hoisting bracket is installed on the remaining main beam segment above the pier. Then, the pier is cut along the lower surface of the cap beam, and the remaining main beam segment above the pier is hoisted away together with the cap beam. Then, the pier bending support on the pier is removed, the lower end of the pier is cut, and the cut-off pier is dismantled.

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