CN211498542U - Static crushing and dismantling construction structure of upper-span existing line arch bridge - Google Patents

Abstract

The utility model discloses an on stride existing line arched bridge static crushing and demolish construction structures, including from top to bottom by demolising the multirow drilling that drills in the arched structure, two symmetries lay in by demolising the protection rack of both sides around the arched bridge and two lay respectively in the side slope protective structure who is demolishd both sides around the arched bridge, every drilling is the vertical drilling that is used for pouring into the static breaker. The utility model has reasonable structure design, simple construction and good use effect, can simply and quickly remove the removed arch structure through static crushing, can not interfere the crossed existing railway line, and can ensure that the static crushing process can not damage the plain concrete arch ring by forming a protective layer in the area close to the arch ring in the removed arch structure; and moreover, the protective shed frame and the side slope protective frame are combined to form a double protective structure, so that the existing railway line crossed cannot be interfered in the dismantling process, and the safety and reliability of the construction process are ensured.

Description

Static crushing and dismantling construction structure of upper-span existing line arch bridge

Technical Field

The utility model belongs to the technical field of the bridge construction, especially, relate to a go up to stride existing line arch bridge static force breakage and demolish construction structures.

Background

At present, the second line engineering and the updating and reconstruction engineering of the existing electrified railway in China are more, most lines of the newly-built second line are built next to the existing railway, the standard is low during the building of the existing railway, the positions of the second line are not reserved under the planning and investment limitations, and most of bridges which cross the existing railway need to build new bridges and remove old bridges during the building of the second line, so that the construction requirement of the roadbed engineering of the newly-built second line can be met. When a highway and municipal engineering are upgraded and transformed, when the line is limited to be changed, when a highway-span iron bridge is upgraded and transformed in situ, the existing bridge also needs to be dismantled, and when the highway-span iron bridge with serious diseases endangers the railway operation safety, hidden dangers also need to be removed in time to eliminate the hidden dangers.

At present, when an overpass bridge (specifically a concrete simply supported beam) of an upper-span electrified railway is dismantled in China, a dismantling scheme of integrally hoisting an integral beam body is generally adopted, a road needs to be closed and stopped, a travelling crane needs to be interrupted during actual dismantling, and the integral blasting dismantling is carried out after the detour. At present, a common demolition method is an in-situ demolition method based on temporary. However, when a highway arch bridge (namely a highway-crossing iron arch bridge) which is built in the early 70 th of the world and spans the existing railway line is dismantled, due to the fact that the structure of the dismantled arch bridge is special and is influenced by factors such as shortage of steel materials and materials, the dismantled arch bridge adopts an open cut tunnel structure consisting of a plain concrete arch ring and a stone slab paving structure to meet the traffic requirement of the highway-crossing railway overpass, the mainstream and the generation products of the highway-crossing railway overpass on national roads and rural roads are solved at that time, but the highway-crossing railway overpass cannot be hoisted and dismantled integrally, the overall dismantling difficulty is very large, and particularly when the dismantled arch bridge is located in mountainous areas and valleys, the construction site is narrow, the overall dismantling difficulty is larger, and the implementation is basically impossible. When the temporary suspension line is constructed by adopting the in-situ dismantling method based on constructing the temporary suspension line for dismantling, the temporary suspension line is constructed, the existing railway train is required to be interrupted after the temporary suspension line is opened, and then the overpass in-situ dismantling is carried out, but the in-situ dismantling method is limited by the reasons of the existing station type, the great difficulty in dismantling the residential areas of villages along the line and the like, the in-situ dismantling implementation condition for constructing the temporary suspension line is not provided, and the line-changing investment is large when the in-situ dismantling method for constructing the temporary suspension line is adopted. Therefore, when the existing arch bridge on the upper span which is limited in construction site and cannot be subjected to temporary line changing is dismantled, the in-situ dismantling construction can be carried out only by utilizing daily maintenance 'skylight points' under the condition of ensuring that the transportation and driving safety of the existing operation railway are not influenced.

When the in-situ demolition is actually carried out, the arch ring of the demolished arch bridge is a plain concrete arch ring, the width of the arch ring is the same as the transverse bridge width of the demolished arch bridge, the width of the arch ring is larger and the width of the arch ring is 5-10 m, so that the demolished arch ring has quite large weight, and when the demolished arch ring is demolished by adopting a blasting method, the demolition arch ring is difficult to construct, high in risk and very large in interference on the existing railway line. Through research and analysis, the arch structure above the arch ring in the removed arch bridge is removed, and then the arch ring is divided and removed, so that the interference on the existing railway line can be effectively reduced.

Static fracturing (also known as static blasting or chemical expansion fracturing) is a technique for breaking concrete, rock, etc. using the solidification expansion force of a static breaker. When the arch structure is dismantled, the arch ring of the dismantled arch bridge is a plain concrete arch ring, so that the plain concrete arch ring is damaged in the process of dismantling the arch structure, and meanwhile, the problems of high labor intensity, low construction efficiency and the like in the process of avoiding the dismantling by a manual breaking hammer are solved by adopting a static crushing method. Meanwhile, a protection structure which is simple in structure, reasonable in design, simple and convenient to disassemble and assemble and good in protection effect is needed, an existing railway line is effectively protected in the process of dismantling the existing arch bridge across the existing railway, the structure is stable and reliable, actual installation and dismantling are convenient, and the investment cost is low.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a static crushing demolition construction structure of an existing arch bridge striding upwards, which is reasonable in structural design, simple and convenient in construction and good in use effect, through drilling a plurality of drill holes for injecting static crushing agent in the demolished arch structure, the demolished arch structure can be demolished simply and quickly, and meanwhile, the existing railway line striden by the demolition cannot be interfered, and the hole depth of the drill hole above the arch ring is limited to form a protective layer in the demolished arch structure near the area of the arch ring, so that the static crushing process cannot damage the plain concrete arch ring; and moreover, the protective shed frame and the side slope protective frame are combined to form a double protective structure, so that the existing railway line crossed cannot be interfered in the dismantling process, and the safety and reliability of the construction process are ensured.

In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a go up to stride existing line arch bridge static crushing and demolish construction structures which characterized in that: the device comprises a plurality of rows of drilled holes drilled in a dismantled arch structure from top to bottom, two protective sheds symmetrically arranged on the front side and the rear side of the dismantled arch bridge and two slope protective structures respectively arranged on the front side and the rear side of the dismantled arch bridge, wherein the two protective sheds are the same in structure and size and symmetrically arranged on the front side and the rear side of the dismantled arch bridge, the longitudinal lengths of the two protective sheds are not less than 5m, and the two protective sheds and the dismantled arch bridge are fastened and connected into a whole;

the demolished arch bridge is positioned between the left slope and the right slope, the demolished arch bridge is vertically arranged and spans an existing railway line, an open cut tunnel for the existing railway line to pass through is arranged below the middle part of the demolished arch bridge, and the two protective shed frames are covered above the existing railway line;

each side slope protection structure comprises a left side slope protection frame and a right side slope protection frame which are symmetrically arranged, the side slope protection frames are vertically arranged and are arranged along the longitudinal length direction of the protection shed frame, and each side slope protection frame is positioned at the toe of one side slope; each protective shed frame is uniformly distributed between two side slope protective frames of one side slope protective structure;

the tunnel top of the open cut tunnel is arched, the left side wall and the right side wall of the open cut tunnel are vertical side walls arranged along the transverse bridge direction, and an arch ring is arranged on the tunnel top of the open cut tunnel and is a plain concrete arch ring; the demolished arch bridge is divided into a demolished arch-upper structure positioned above an arch ring and an arch-lower structure positioned below the arch ring by taking the arch ring as a boundary, the arch-lower structure is supported on the ground, and the demolished arch-upper structure and the demolished arch-lower structure are both masonry structures made of grouted rubble; the arch structure is provided with a left vertical supporting column and a right vertical supporting column for supporting an arch ring, the bottoms of the left side and the right side of the arch ring are supported on one vertical supporting column, and a cavity between the two vertical supporting columns is an open cut tunnel; the upper surface of the under-arch structure is a horizontal plane, and the upper surface of the under-arch structure is flush with the upper surface of the vertical supporting column;

the front side wall and the rear side wall of the removed arch bridge are arranged in parallel and are both shed frame fixing side walls for fixing a protective shed frame, the shed frame fixing side walls are straight side walls which are arranged vertically and are arranged vertically to the vertical side walls, and the two protective shed frames are arranged vertically to the shed frame fixing side walls; the vertical distance between the arch crown of the arch ring and the upper surface of the arch bridge to be dismantled is not more than 1 m; the length of the side slope protection frame is greater than the longitudinal length of the protection shed frame, one end of the side slope protection frame, which is close to the fixed side wall of the shed frame, is a protection frame starting end, and the protection frame starting end is tightly attached to the fixed side wall of the shed frame;

a plurality of rows of the drill holes are distributed from front to back along the transverse bridge direction, and a plurality of rows of the drill holes are uniformly distributed; each row of the drill holes comprises a plurality of drill holes which are distributed on the same vertical surface from left to right along the longitudinal bridge, and the plurality of drill holes in each row of the drill holes are uniformly distributed; all the drill holes on the dismantled arch structure are distributed in multiple rows and multiple columns; each drill hole is a vertical drill hole for injecting a static crushing agent, and the hole depth of each drill hole is not more than 2 m; the vertical distance between the bottom of each drilling hole positioned above the arch ring and the outer side wall of the arch ring is 18-22 cm;

each protective shed frame comprises two strip-shaped foundations which are symmetrically arranged on the left and right, an arched support frame which is supported on the two strip-shaped foundations and a protective shed which is arranged on the outer side of the arched support frame, the two strip-shaped foundations are arranged on the same horizontal plane and are both horizontally arranged concrete foundations, the two strip-shaped foundations are arranged in parallel and are both vertically arranged with the fixed side wall of the shed frame; the bottoms of the left side and the right side of the arched support frame are supported on one strip-shaped foundation; the arched support frames and the protection shed are horizontally arranged, and the lengths of the protection shed and the two strip-shaped bases are the same as the longitudinal length of the arched support frames; the cross section shapes of the arched support frame and the protection shed are the same as the cross section shape of the open cut tunnel; the one end of arch support frame is for fixing support frame stiff end on the fixed lateral wall of rack, the support frame stiff end is rather than fixed the fixed lateral wall of rack is hugged closely.

Above-mentioned stride existing line arch bridge static force breakage and demolish construction structures, characterized by: the distance between the front row of drill holes and the rear row of drill holes in the disassembled arch structure is 0.8-1.2 m, and the distance between two adjacent drill holes in each row of drill holes is 0.4-0.6 m.

Above-mentioned stride existing line arch bridge static force breakage and demolish construction structures, characterized by: the aperture of all the drill holes in the removed arch structure is the same, and the aperture of each drill hole is phi 36 mm-phi 46 mm.

Above-mentioned stride existing line arch bridge static force breakage and demolish construction structures, characterized by: the side slope protection frame comprises a longitudinal protection frame and a longitudinal protection plate, wherein the longitudinal protection frame is vertically arranged, the longitudinal protection plate is arranged on the outer side of the longitudinal protection frame, the longitudinal protection frame comprises a plurality of vertical supporting columns and an upper horizontal connecting rod and a lower horizontal connecting rod, the vertical supporting columns are arranged on the same vertical surface from front to back, the upper horizontal connecting rod and the lower horizontal connecting rod are horizontally arranged, and each horizontal connecting rod is fixedly connected with the vertical supporting columns; the vertical supporting columns are fixedly connected with a longitudinal protective plate into a whole through horizontal connecting rods, the longitudinal protective plate is vertically arranged, and the longitudinal protective plate and the longitudinal protective frame are arranged in parallel with the protective shed frame; every vertical pillar bottom all inserts in the soil body of below ground from top to bottom.

Above-mentioned stride existing line arch bridge static force breakage and demolish construction structures, characterized by: the arched support frame comprises a plurality of profile steel arch frames arranged from front to back and a plurality of longitudinal connecting pieces fixed inside the arched support frame, wherein the longitudinal connecting pieces are horizontally arranged and have the length the same as that of the arched support frame, and the longitudinal connecting pieces are arranged in parallel with the strip foundation and are arranged along the inner contour line of the profile steel arch frames; the plurality of longitudinal connecting pieces are all flat steel sections, each longitudinal connecting piece is fixedly connected with a plurality of steel section arch frames in the arch supporting frame, and the plurality of steel section arch frames in the protective shed frame are fixedly connected into a whole through the plurality of longitudinal connecting pieces; the structure and the size of a plurality of profile steel arches in the arch supporting frame are the same and are uniformly distributed on the same horizontal plane, the plurality of profile steel arches are distributed in parallel and are all distributed vertically to the strip-shaped foundation, the plurality of profile steel arches are uniformly distributed and are all distributed vertically, and the bottoms of the left end and the right end of each profile steel arch are supported on one strip-shaped foundation; each steel arch is formed by bending a I-shaped steel, and the web plates of the I-shaped steel are vertically arranged;

each structural steel arch comprises an upper arch and two vertical upright columns symmetrically distributed below the left side and the right side of the upper arch, and the upper arch and the two vertical upright columns in each structural steel arch are uniformly distributed on the same vertical surface; the shape of the upper arch is the same as that of the arch ring;

the shape of each steel arch is the same as the shape of the cross section of the open cut tunnel; one steel arch frame closest to the arch ring in the arch supporting frames is a fixed side arch frame, the upper arch frame of the fixed side arch frame is tightly attached to the arch ring, two vertical upright columns of the fixed side arch frame are tightly attached to one vertical supporting column, and two strip-shaped bases are located below the same side of the arch ring; each vertical upright post of the fixed side arch is fixed on a vertical supporting post which is abutted against the vertical upright post through a plurality of fasteners arranged from top to bottom, the outer end of each fastener extends out of a web plate of the fixed side arch, and a plurality of through holes for the fasteners to penetrate out are formed in the web plate of the fixed side arch;

the arched support frame is formed by connecting one arched support and two lower supports symmetrically distributed below the left side and the right side of the arched support;

the protective shed is formed by connecting an arched ceiling erected on the arched support and two side shed bodies vertically arranged, the two side shed bodies are symmetrically arranged below the arched ceiling, and the arched ceiling and the two side shed bodies are formed by splicing a plurality of shielding plates; the cross section of the protection shed is the same as that of the arched support frame.

Above-mentioned stride existing line arch bridge static force breakage and demolish construction structures, characterized by: the arch ring and the upper arch are semicircular, the inner diameter of the upper arch is 40-50 cm larger than that of the arch ring, and the height of the vertical upright post in each profile steel arch is the same as that of the vertical side wall in the open cut tunnel;

the clear distance between two vertical upright posts in each profile steel arch is 40-50 cm larger than the distance between two vertical side walls in the open cut tunnel.

Above-mentioned stride existing line arch bridge static force breakage and demolish construction structures, characterized by: the steel arch frame is characterized in that the steel arch frame which is farthest away from the arch ring in the arch support frame is an edge arch frame, a limiting frame which limits the protection shed is welded on the edge arch frame, the shape of the limiting frame is the same as that of the steel arch frame, the limiting frame is welded and fixed on the outer side of the edge arch frame, and the limiting frame and the edge arch frame are arranged in parallel.

Above-mentioned stride existing line arch bridge static force breakage and demolish construction structures, characterized by: the upper wing plates of all the profile steel arch frames in the arched support frame form a support arch frame for supporting the protective shed, a plurality of connecting bolts for connecting the protective shed are uniformly distributed on the upper wing plate of each profile steel arch frame in the arched support frame, and the connecting bolts are distributed along the contour line of the upper wing plate and are uniformly distributed on the same vertical surface; each connecting bolt is vertically arranged with the outer side wall of the upper wing plate at the arrangement position; and a plurality of bolt mounting holes for mounting connecting bolts are formed in the upper wing plate of each profile steel arch and the protective shed.

Above-mentioned stride existing line arch bridge static force breakage and demolish construction structures, characterized by: the arched ceilings comprise a lower ceiling and an upper ceiling positioned right above the lower ceiling, the cross sections of the lower ceiling and the upper ceiling are arched, and the cross sections of the lower ceiling and the upper ceiling are both in the shape of an arch and the shape of the cross section of the arched bracket; the lower ceiling is supported on the arched support, the upper ceiling is supported on the lower ceiling, and a layer of geotextile is filled between the upper ceiling and the lower ceiling.

Above-mentioned stride existing line arch bridge static force breakage and demolish construction structures, characterized by: a layer of horizontal steel plate is paved on each strip-shaped foundation, the horizontal steel plate is a strip-shaped steel plate, and the profile steel arch frame and the horizontal steel plate supported by the profile steel arch frame are fixedly connected in a welding mode;

the longitudinal connecting piece is a channel steel with an inward notch, and a web plate of the longitudinal connecting piece and the inner wall of the profile steel arch are welded and fixed into a whole.

Compared with the prior art, the utility model has the following advantage:

1. simple structure, reasonable in design and processing preparation are simple and convenient, and the input cost is lower.

2. The layout position of the adopted drill hole is reasonable in design and good in using effect, the undisturbed crushing process of the removed arch structure is realized by injecting the static crushing agent into the drill hole, and a certain distance exists between the bottom of each drill hole above the arch ring and the outer side wall of the arch ring, so that a protective layer is formed in the area, close to the arch ring, of the removed arch structure, the static crushing process can be prevented from damaging the plain concrete arch ring, and the arch ring can be conveniently hoisted after being segmented in the later period; meanwhile, the conditions of stone falling, collapse and the like after the plain concrete arch ring is damaged are avoided, and the great interference of the arch bridge dismantling process on the existing railway line is avoided.

3. The adopted protective shed frame has the advantages of simple structure, reasonable design, simple and convenient processing, economy and practicality, simple and convenient actual disassembly and assembly, and the arched support frame and the protective shed are connected into a whole, can be disassembled and assembled integrally, can be fixed on the disassembled arch bridge simply and quickly, is simple and convenient to fix, and can be connected with the disassembled arch bridge simply and reliably. When actually fixing, only need in the arch support frame every vertical stand of fixed side bow member all fix rather than the vertical support column that is close to through the fastener of laying from top to bottom can to can not cause any damage to plain concrete arch ring.

4. The adopted protective shed frame has good use effect and has the following advantages: firstly, falling objects can be effectively prevented, falling fragments and falling fragments can be effectively blocked, the railway driving safety and the safety of existing equipment are ensured, and a very reliable safety protection effect is achieved; secondly, the structure has good stress performance, can bear large falling objects, the large falling objects cannot be retained on the shed frame, and the shed frame is not easy to deform; thirdly, after the assembly is finished, the assembly can be hoisted and installed in place at one time, and can be dismantled at one time, so that the assembly and disassembly are simple and rapid in practice; fourthly, the actual processing is simple and convenient, and the steel structure processing factory for tunnel construction is convenient to process nearby; and fifthly, the cross section structure is consistent with the structure of the open cut tunnel of the arch bridge, the protection range is large, the protection is tight, the height of a contact net of the crossed existing railway line can be maintained, and the contact net does not need to be dismantled or changed.

5. The adopted side slope protection frames can effectively stop stones falling from the side slopes on the two sides of the removed arch bridge, the longitudinal length of each side slope protection frame is greater than that of the protection shed frame, the protection shed frames are matched with the side slope protection frames on the left side and the right side to realize double protection, and any interference on an existing railway line cannot be caused in the arch bridge removal process.

6. The method has the advantages that the use effect is good, the practical value is high, the plurality of drill holes for injecting the static crushing agent are drilled in the removed arch structure, and the hole depth of the drill hole above the arch ring is limited, so that the removed arch structure can be simply, conveniently and quickly removed, the crossed existing railway line cannot be interfered, and a protective layer is formed in the area, close to the arch ring, in the removed arch structure, so that the static crushing process cannot damage the plain concrete arch ring; meanwhile, the protective shed frame and the side slope protective frame are combined to form a double protective structure, so that the static crushing process, the demolished arch-up structure and the demolished arch-down structure can not cause any interference to the crossed existing railway line, and the safety and reliability of the construction process are ensured. The adopted protective shed frame has reasonable structural design, simple and convenient disassembly and assembly and good use effect, the arched support frame and the protective shed are connected into a whole, the integral disassembly and assembly can be carried out, and the arched support frame can be simply, conveniently and reliably connected with the disassembled arch bridge, so that the arched support frame can be simply, conveniently and quickly fixed on one side of the disassembled arch bridge, the construction period can be effectively shortened, and the arch bridge disassembly efficiency is accelerated; and the device is not easy to deform, can effectively protect the crossed existing railway line, and is economical and practical.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic plan view of the present invention.

Fig. 2 is the position schematic diagram is laid with the facade of the removed arch bridge to the protection shed frame and the side slope protection frame of the utility model.

Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.

Fig. 4 is a schematic view of the vertical structure of the protective shed frame of the present invention.

Fig. 5 is the schematic diagram of the layout position of the fastening piece between the fixed side arch frame and the vertical supporting column of the utility model.

Fig. 6 is a schematic view of the vertical plane layout position of the limiting frame of the present invention.

Fig. 7 is a schematic view of the vertical structure of the arched bracket and the arched ceiling of the present invention.

Fig. 8 is a partially enlarged schematic view of a portion a of fig. 7.

Fig. 9 is a schematic structural view of the steel arch of the present invention.

Description of reference numerals:

1-protective shed frame; 1-a profile steel arch frame; 1-2-bar foundation;

1-3-longitudinal connectors; 1-4-horizontal steel plate; 1-5-anchoring the steel bar;

1-6-longitudinal connecting steel bars; 1-7-side shed body; 1-8-a limiting frame;

1-9-lower ceiling; 1-10-upper ceiling; 1-11-upper arch centering;

1-12-vertical columns; 1-13-geotextile; 1-14-connecting steel plates;

2-the arch bridge is dismantled; 2-1-open cut tunnel; 2-vertical support columns;

2-3-arch ring; 3, anchoring the bolt; 4, locking a nut;

5, connecting a bolt; 6, a backing plate; 7, drilling;

8-slope protection frame; 8-1-vertical struts; 8-2-horizontal connecting rod;

8-3-longitudinal protection plate; 9-side slope.

Detailed Description

As shown in fig. 1 and fig. 2, the utility model comprises a plurality of rows of drilled holes 7 drilled in the dismantled arch structure from top to bottom, two protection shelves 1 symmetrically arranged at the front and back sides of the dismantled arch bridge 2 and two side slope protection structures respectively arranged at the front and back sides of the dismantled arch bridge 2, wherein the two protection shelves 1 have the same structure and size and are symmetrically arranged at the front and back sides of the dismantled arch bridge 2, the longitudinal length of the two protection shelves 1 is not less than 5m and the two protection shelves are fastened and connected with the dismantled arch bridge 2 into a whole;

the dismantled arch bridge 2 is positioned between the left side slope 9 and the right side slope 9, the dismantled arch bridge 2 is vertically arranged and spans an existing railway line, an open cut tunnel 2-1 for the existing railway line to pass through is arranged below the middle part of the dismantled arch bridge 2, and the two protective shed frames 1 are covered above the existing railway line;

each side slope protection structure comprises a left side slope protection frame 8 and a right side slope protection frame 8 which are symmetrically arranged, the side slope protection frames 8 are vertically arranged and are arranged along the longitudinal length direction of the protection shed frame 1, and each side slope protection frame 8 is positioned at the slope toe of one side slope 9; each protection shed frame 1 is uniformly distributed between two side slope protection frames 8 of one side slope protection structure;

the top of the open cut tunnel 2-1 is arched, the left side wall and the right side wall of the open cut tunnel are vertical side walls which are arranged along the transverse bridge direction, an arch ring 2-3 is arranged at the top of the open cut tunnel 2-1, and the arch ring 2-3 is a plain concrete arch ring; the demolished arch bridge 2 is divided into a demolished arch-upper structure positioned above an arch ring 2-3 and an arch-lower structure positioned below the arch ring 2-3 by taking the arch ring 2-3 as a boundary, the arch-lower structure is supported on the ground, and both the demolished arch-upper structure and the demolished arch-lower structure are masonry structures made of grouted rubble; the under-arch structure is provided with a left vertical supporting column 2-2 and a right vertical supporting column 2-2 which are used for supporting an arch ring 2-3, the bottoms of the left side and the right side of the arch ring 2-3 are supported on one vertical supporting column 2-2, and a cavity between the two vertical supporting columns 2-2 is an open cut tunnel 2-1; the upper surface of the under-arch structure is a horizontal plane, and the upper surface of the under-arch structure is flush with the upper surface of the vertical support column 2-2;

referring to fig. 4, the front and rear side walls of the removed arch bridge 2 are arranged in parallel and are both frame fixing side walls for fixing the protection frame 1, the frame fixing side walls are straight side walls which are arranged vertically and are arranged vertically to the vertical side walls, and both the protection frames 1 are arranged vertically to the frame fixing side walls; the vertical distance between the arch top of the arch ring 2-3 and the upper surface of the arch bridge 2 to be dismantled is not more than 1 m; the length of the side slope protection frame 8 is greater than the longitudinal length of the protection shed frame 1, one end, close to the fixed side wall of the shed frame, of the side slope protection frame 8 is a protection frame starting end, and the protection frame starting end is tightly attached to the fixed side wall of the shed frame;

the multiple rows of the drill holes 7 are distributed from front to back along the transverse bridge direction, and the multiple rows of the drill holes 7 are uniformly distributed; each row of the drill holes 7 comprises a plurality of drill holes 7 which are distributed on the same vertical surface from left to right along the longitudinal bridge, and the plurality of drill holes 7 in each row of the drill holes 7 are uniformly distributed; all the drill holes 7 on the dismantled arch structure are arranged in multiple rows and multiple columns; each drill hole 7 is a vertical drill hole for injecting a static crushing agent, and the hole depth of each drill hole 7 is not more than 2 m; the vertical distance between the bottom of each drill hole 7 positioned above the arch ring 2-3 and the outer side wall of the arch ring 2-3 is 18 cm-22 cm;

each protective shed frame 1 comprises two strip-shaped foundations 1-2 which are symmetrically arranged on the left and right, an arched support frame which is supported on the two strip-shaped foundations 1-2 and a protective shed which is erected on the outer side of the arched support frame, the two strip-shaped foundations 1-2 are arranged on the same horizontal plane and are both horizontally arranged concrete foundations, the two strip-shaped foundations 1-2 are arranged in parallel and are both vertically arranged with the fixed side wall of the shed frame; the bottoms of the left side and the right side of the arched support frame are supported on one strip-shaped foundation 1-2; the arched support frames and the protective shed are horizontally arranged, and the lengths of the protective shed and the two strip-shaped foundations 1-2 are the same as the longitudinal length of the arched support frames; the cross section shapes of the arched support frame and the protection shed are the same as the cross section shape of the open cut tunnel 2-1; the one end of arch support frame is for fixing support frame stiff end on the fixed lateral wall of rack, the support frame stiff end is rather than fixed the fixed lateral wall of rack is hugged closely.

In this embodiment, the vertical distance between the arch top of the arch ring 2-3 and the upper surface of the removed arch bridge 2 is 0.8 m.

In the embodiment, the vertical distance between the bottom of each drill hole 7 positioned above the arch ring 2-3 and the outer side wall of the arch ring 2-3 is 20 cm; the drill holes 7 positioned above the arch rings 2-3 in the removed arch structure are drill holes above the arch rings, and the hole depth of all the drill holes 7 except the drill holes above the arch rings in the removed arch structure is 2 m.

During actual construction, the vertical distance between the bottom of each drill hole 7 positioned above the arch ring 2-3 and the outer side wall of the arch ring 2-3 can be correspondingly adjusted according to specific requirements.

The distance between the front row of the drill holes 7 and the rear row of the drill holes 7 adjacent to each other in the disassembled arch structure is 0.8-1.2 m, and the distance between two adjacent drill holes 7 in each row of the drill holes 7 is 0.4-0.6 m. The aperture of all the drill holes 7 in the removed arch structure is the same, and the aperture of each drill hole 7 is phi 36 mm-phi 46 mm. In this embodiment, the distance between two adjacent rows of the front and rear drill holes 7 in the removed arch structure is 1m, the distance between two adjacent drill holes 7 in each row of the drill holes 7 is 0.5m, and the aperture of each drill hole 7 is phi 40 mm. During actual construction, the distance between two adjacent rows of the drill holes 7 in the front and the back, the distance between two adjacent drill holes 7 in each row of the drill holes 7 and the aperture of the drill holes 7 can be respectively and correspondingly adjusted according to specific requirements.

As shown in fig. 3, the side slope protection frame 8 comprises a longitudinal protection frame which is vertically arranged and a longitudinal protection plate 8-3 which is arranged on the outer side of the longitudinal protection frame, the longitudinal protection frame comprises a plurality of vertical pillars 8-1 which are arranged on the same vertical surface from front to back and an upper horizontal connecting rod 8-2 and a lower horizontal connecting rod 8-2 which are horizontally arranged, and each horizontal connecting rod 8-2 is fixedly connected with the vertical pillars 8-1; the vertical supporting columns 8-1 are fixedly connected with the longitudinal protection plate 8-3 into a whole through horizontal connecting rods 8-2, the longitudinal protection plate 8-3 is vertically arranged, and the longitudinal protection plate and the longitudinal protection frame are arranged in parallel with the protection shed frame 1; the bottom of each vertical strut 8-1 is inserted into the soil body below the ground from top to bottom.

In this embodiment, vertical guard plate 8-3 includes a plurality of vertical guard plates of laying on same vertical face from top to bottom, vertical guard plate is bamboo frame plate. Therefore, the longitudinal protection plate 8-3 is simple and convenient to construct, firm in fixation and good in protection effect.

As shown in fig. 4, the arched support frame comprises a plurality of section steel arch frames 1-1 arranged from front to back and a plurality of longitudinal connecting pieces 1-3 fixed inside the arched support frame, wherein the plurality of longitudinal connecting pieces 1-3 are horizontally arranged and have the same length as the longitudinal length of the arched support frame, and the plurality of longitudinal connecting pieces 1-3 are arranged in parallel with the strip-shaped foundation 1-2 and are arranged along the inner contour line of the section steel arch frames 1-1; the plurality of longitudinal connecting pieces 1-3 are all straight section steel, each longitudinal connecting piece 1-3 is fixedly connected with a plurality of section steel arch frames 1-1 in the arch supporting frame, and the plurality of section steel arch frames 1-1 in the protective shed frame 1 are fixedly connected into a whole through the plurality of longitudinal connecting pieces 1-3; the structure and the size of a plurality of profile steel arches 1-1 in the arch supporting frame are the same and are uniformly distributed on the same horizontal plane, the plurality of profile steel arches 1-1 are distributed in parallel and are vertically distributed with strip-shaped bases 1-2, the plurality of profile steel arches 1-1 are uniformly distributed and are vertically distributed, and the bottoms of the left and right ends of each profile steel arch 1-1 are supported on one strip-shaped base 1-2; each steel arch 1-1 is formed by bending a I-shaped steel, and webs of the I-shaped steel are vertically arranged;

each steel arch 1-1 comprises an upper arch 1-11 and two vertical upright posts 1-12 symmetrically arranged below the left side and the right side of the upper arch 1-11, and the upper arch 1-11 and the two vertical upright posts 1-12 in the middle of each steel arch 1-1 are uniformly distributed on the same vertical plane; the shape of the upper arch 1-11 is the same as that of the arch ring 2-3;

the shape of each steel arch 1-1 is the same as the shape of the cross section of the open cut tunnel 2-1; one steel arch 1-1 closest to an arch ring 2-3 in the arch support frame is a fixed side arch, an upper arch 1-11 of the fixed side arch is tightly attached to the arch ring 2-3, two vertical columns 1-12 of the fixed side arch are tightly attached to one vertical supporting column 2-2, and two strip-shaped foundations 1-2 are positioned below the same side of the arch ring 2-3; each vertical upright post 1-12 of the fixed side arch is fixed on a vertical supporting post 2-2 which is close to the vertical upright post by a plurality of fasteners arranged from top to bottom, the outer end of each fastener extends out of a web plate of the fixed side arch, and the web plate of the fixed side arch is provided with a plurality of through holes for the fasteners to penetrate out;

the arched support frame is characterized in that a plurality of vertical upright posts 1-12 which are arranged from front to back and positioned on the same vertical surface form a lower support, all upper arch frames 1-11 in the arched support frame form an arched support, and the arched support frame is formed by connecting one arched support and two lower supports symmetrically arranged below the left side and the right side of the arched support;

the protective shed is formed by connecting an arched ceiling erected on the arched support and two side shed bodies 1-7 which are vertically arranged, the two side shed bodies 1-7 are symmetrically arranged below the arched ceiling, and the arched ceiling and the two side shed bodies 1-7 are formed by splicing a plurality of shielding plates; the cross section of the protection shed is the same as that of the arched support frame.

In actual construction, in order to ensure the protection effect, the protection shed frame 1 and the removed arch bridge 2 need to be fastened and connected into a whole. In this embodiment, when the protection shed frame 1 is connected to the removed arch bridge 2, the two vertical columns 1 to 12 of the fixed side arch frame are both fixed to the vertical support columns 2 to 2 of the removed arch bridge 2, so that the actual fixation is simple and convenient, the connection is firm, and the protection effect of the protection shed frame 1 can be ensured.

For simple connection, in this embodiment, the fastening member is the anchor rod 3 or the steel bar.

As shown in fig. 5, a plurality of anchor rods 3 are horizontally arranged, each anchor rod 3 is a straight anchor rod which is driven into the masonry structure of the grouted rubble from outside to inside, and each anchor rod 3 is arranged in parallel with the strip foundation 1-2.

For firm fixation, the outer end of each anchor rod 3 is fixedly fastened on the fixed side arch frame through anchor rod connecting steel bars, the anchor rod connecting steel bars are L-shaped steel bars, and the L-shaped steel bars are formed by connecting two straight steel bar sections which are vertically arranged; one straight steel bar section in the L-shaped steel bar is horizontally arranged and is fixedly connected with the outer end of the anchor rod 3, and the other straight steel bar section in the L-shaped steel bar is vertically arranged and is fixedly connected with the web plate of the fixed side arch frame.

During actual construction, the L-shaped steel bar 4 is connected with the anchor rod 3 and the fixed side arch frame in a welding mode.

In order to further improve the protection effect of the protection shed frame 1, in the embodiment, the arch rings 2-3 and the upper arch frames 1-11 are semicircular, the inner diameters of the upper arch frames 1-11 are 40 cm-50 cm larger than the inner diameter of the arch ring 2-3, and the height of the vertical upright columns 1-12 in each profile steel arch frame 1-1 is the same as the height of the vertical side walls in the open cut tunnel 2-1;

the clear distance between two vertical upright posts 1-12 in each profile steel arch 1-1 is 40-50 cm larger than the distance between two vertical side walls in the open cut tunnel 2-1.

During actual processing, the inner diameter of the upper arch 1-11 and the clear distance between the two vertical columns 1-12 in each steel arch 1-1 can be adjusted correspondingly according to specific needs.

In this embodiment, as shown in fig. 6, one of the profile steel arches 1-1 of the arch support frame, which is farthest from the arch rings 2-3, is an edge arch, a limiting frame 1-8 for limiting the protection shed is welded on the edge arch, the shape of the limiting frame 1-8 is the same as that of the profile steel arch 1-1, the limiting frame 1-8 is welded and fixed on the outer side of the edge arch, and the limiting frame 1-8 and the edge arch are arranged in parallel.

For strengthening portably and spacing reliable, spacing 1-8 are formed by a right angle steel bending, a right angle limit of right angle steel is vertical to laying and it is right the backstop board that the protection canopy keeps off, another right angle limit of right angle steel with edge bow member welded fastening is as an organic whole. In this embodiment, the edge arch and the limiting frames 1 to 8 are fixedly connected in a full-length welding manner.

With reference to fig. 7 and 8, in order to enable the arched support frame and the protection shed to be conveniently and quickly assembled into a whole, the upper wing plates of all the profile steel arch frames 1-1 in the arched support frame form a support arch frame for supporting the protection shed, a plurality of connecting bolts 5 for connecting the protection shed are uniformly distributed on the upper wing plate of each profile steel arch frame 1-1 in the arched support frame, and the plurality of connecting bolts 5 are distributed along the contour line of the upper wing plate and are uniformly distributed on the same vertical plane; each connecting bolt 5 is vertically arranged with the outer side wall of the upper wing plate at the arrangement position thereof; and a plurality of bolt mounting holes for mounting connecting bolts 5 are formed in the upper wing plate of each profile steel arch 1-1 and the protective shed.

For fixed simple and convenient, firm to it is right to prevent that connecting bolt 5 from leading to the fact the protection canopy from damaging, every all the cover is equipped with backing plate 6 on connecting bolt 5's the screw rod, backing plate 6 is the band iron and its cloth in the protection canopy outside, backing plate 6 presss from both sides and locates between protection canopy and connecting bolt 5's the nut, can further ensure arch support frame with joint strength and connection quality between the protection canopy. Meanwhile, the connecting bolt 5 is sleeved with a locking nut 4, and the backing plate 6 is clamped between the locking nut 4 and the protective shed.

When the arched support frame is actually assembled, two front and rear adjacent section steel arch frames 1-1 in the arched support frame are fixedly connected through a plurality of longitudinal connecting steel bars 1-6, the longitudinal connecting steel bars 1-6 are horizontally arranged and are arranged in parallel with a strip foundation 1-2, the longitudinal connecting steel bars 1-6 are positioned in the arched support frame, and each longitudinal connecting steel bar 1-6 is fixedly connected with the section steel arch frame 1-1 connected with the longitudinal connecting steel bar 1-6 in a welding mode;

many pin in the arched support frame shaped steel bow member 1-1 through the multichannel 1-3 with lay in all longitudinal connection reinforcing bar 1-6 fastening connection of arched support frame inside is as an organic whole, all longitudinal connection reinforcing bar 1-6 of arched support frame inside can further strengthen arched support frame's support intensity and steadiness, further improve the utility model discloses a protective strength. In this embodiment, each of the longitudinal connecting steel bars 1 to 6 is located between two of the longitudinal connecting members 1 to 3.

And when the arched support frame is actually processed, the distance between two front and rear adjacent profile steel arches 1-1 in the arched support frame is 0.4-0.6 m. In the embodiment, the distance between two front and rear adjacent profile steel arches 1-1 in the arch support frame is 0.5 m. In actual processing, the distance between two front and rear adjacent steel arches 1-1 in the arch support frame can be correspondingly adjusted according to specific requirements.

In order to achieve firm fixed connection, stable support and convenient later-stage removal, a layer of horizontal steel plate 1-4 is paved on each strip foundation 1-2, the horizontal steel plate 1-4 is a strip steel plate, and the profile steel arch 1-1 and the horizontal steel plate 1-4 supported by the profile steel arch are fixedly connected in a welding mode.

In the embodiment, a plurality of anchoring steel bars 1-5 for fixing a horizontal steel plate 1-4 positioned above the anchoring steel bars are arranged in the strip foundation 1-2, and the plurality of anchoring steel bars 1-5 are arranged from front to back along the length direction of the strip foundation 1-2; each anchoring steel bar 1-5 is vertically arranged, the bottom of each anchoring steel bar is bent to form a hook, a plurality of anchoring steel bars 1-5 are poured into the strip-shaped foundation 1-2, and the upper parts of the plurality of anchoring steel bars 1-5 are welded and fixed with the horizontal steel plates 1-4 positioned above the anchoring steel bars into a whole.

In this embodiment, in order to further improve the support strength and stability of the arched support frame, the longitudinal connecting members 1 to 3 are channel steels with inward notches, and the webs of the longitudinal connecting members 1 to 3 are welded and fixed with the inner walls of the profile steel arches 1 to 1 into a whole.

In practice, other types of flat steel may be used for the longitudinal connecting members 1 to 3.

As shown in fig. 7, in order to further improve the protection tightness and prevent fine particles from falling, the arched ceilings comprise a lower ceiling 1-9 and an upper ceiling 1-10 positioned right above the lower ceiling 1-9, the cross sections of the lower ceiling 1-9 and the upper ceiling 1-10 are arched, and the cross sections of the lower ceiling 1-9 and the upper ceiling 1-10 are both the same as the cross section of the arched bracket; the lower ceilings 1-9 are supported on the arch-shaped supports, the upper ceilings 1-10 are supported on the lower ceilings 1-9, and a layer of geotextile 1-13 is padded between the lower ceilings 1-9 and the upper ceilings.

In this embodiment, the shielding plate is a bamboo frame plate.

In practice, the shielding plate may be made of other types of panels, such as wooden panels.

In this embodiment, the cross sections of the two strip foundations 1-2 are both rectangular. Rectangular grooves for pouring the strip foundations 1-2 are uniformly distributed on the ground on the front side and the rear side of the dismantled arch bridge 2.

During actual construction, firstly, respectively excavating two cuboid grooves for construction of the strip foundations 1-2 on the front side and the rear side of the dismantled arch bridge 2, then pouring concrete in each cuboid groove to obtain the strip foundations 1-2 which are formed by construction, and embedding a plurality of anchoring reinforcing steel bars 1-5 in each strip foundation 1-2; and finally, fixing the horizontal steel plate 1-4 on the strip foundation 1-2, and welding and fixing the horizontal steel plate 1-4 and the plurality of anchoring steel bars 1-5 into a whole to finish the construction process of the strip foundation 1-2.

In this embodiment, the longitudinal lengths of the arched support frames and the protection shed are both 5m, correspondingly, the length of the strip foundation 1-2 is 5m, the cross section of the strip foundation 1-2 is square, and the width and the height of the cross section are both 0.5 m. The thickness of the horizontal steel plates 1-4 is 1 cm.

During actual construction, the longitudinal lengths of the arched support frames and the protective shed and the lengths and cross section sizes of the strip foundations 1-2 can be adjusted correspondingly according to specific requirements.

When the arched support frame is assembled, a plurality of steel arches 1-1 in the arched support frame are fixedly connected into a whole through a plurality of longitudinal connecting pieces 1-3 and all longitudinal connecting steel bars 1-6 distributed in the arched support frame, and meanwhile, the limiting frames 1-8 are welded on the edge arch of the arched support frame to complete the assembling process of the arched support frame; and erecting the protective shed on the assembled arched support frame, and tightly connecting the protective shed and the arched support frame into a whole through a connecting bolt 5 to obtain the protective shed and the arched support frame which are assembled into a whole.

As shown in fig. 9, in this embodiment, in order to further improve the supporting strength of the steel arch 1-1 for each roof truss and to facilitate the reinforcement of the steel arch 1-1, the upper arch 1-11 is divided into three arch segments from left to right, and the three arch segments are respectively a middle segment and two side segments symmetrically arranged at left and right. The middle upper arch 1-11 of each section steel arch 1-1 and the vertical upright posts 1-12 and the middle section and the two side sections of the upper arch 1-11 are fixedly connected through connecting steel plates 1-14. During actual machining, the middle section and the two side sections are machined by a cold bending machine.

Before the removed arch bridge 2 is removed, the two protection shed frames 1 and the two slope protection structures are respectively constructed. Wherein, the construction method of the two protective shed frames 1 is the same. When any one of the protection shed frames 1 is constructed, firstly, two protection shed frames 1 supported at the bottom of the protection shed frame 1 are constructed respectively; after the two strip foundations 1-2 are constructed, hoisting the assembled protection shed and the arch-shaped support frame in place by using hoisting equipment, and enabling the bottoms of the left side and the right side of the arch-shaped support frame to be supported on one strip foundation 1-2, so as to finish the hoisting process of the protection shed and the arch-shaped support frame; and then, fixing the fixed side arch centering of the arch support frame on the removed arch bridge 2 through a plurality of anchor rods 3, and welding the bottoms of the left side and the right side of the arch support frame and horizontal steel plates 1-4 on the supported strip foundations 1-2 into a whole to finish the installation process of the protective shed frame 1. After the installation is finished, the arched support frame and the protection shed are tightly propped against the dismantled arch bridge 2, no gap exists, and the protection tightness of the protection shed frame can be ensured.

In the construction process of the two protective shed frames 1 and the two side slope protective structures, a plurality of drill holes 7 in the removed arch structure are drilled respectively by synchronously adopting drilling equipment, after all the drill holes 7 are drilled, a static crushing agent is injected into each drill hole 7, and the removed arch structure is subjected to static crushing. And before the removed arch structure is subjected to static crushing, it is required to ensure that the two protection shed frames 1 and the two side slope protection structures are constructed.

After the static crushing of the dismantled arch structure is completed, manually transporting crushed stones generated after the static crushing, and simultaneously manually crushing and dismantling the residual mortar rubble masonry layer above the arch rings 2-3 by adopting a crushing hammer until the arch rings 2-3 are exposed outside; then, cutting equipment is adopted to divide the arch ring 2-3 and then the arch ring is hoisted, so that the process of dismantling the arch ring 2-3 is completed; after the arch rings 2-3 are dismantled, the left side and the right side of the protective shed frame 1 are respectively dismantled by adopting an excavator to respectively dismantle the masonry structures of the grouted rubble located on the left side and the right side of the arch rings 2-3 until the dismantling process of the dismantled arch rings 2 is completed, the construction process is simple, convenient and quick, the construction process cannot influence the normal operation of the crossed existing railway line, and the construction process is safe and reliable.

And after the removed arch bridge 2 is removed, removing the two protective shed frames 1 and the two slope protective structures. When the protective shed frame 1 is dismantled, the bottoms of the left side and the right side of the arched support frames are disconnected from the upper horizontal steel plates 1-4 of the supported bar foundations 1-2 by cutting equipment, and then the protective shed and the arched support frames are hoisted to storage positions by hoisting equipment.

The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.

Claims (10)

1. The utility model provides a go up to stride existing line arch bridge static crushing and demolish construction structures which characterized in that: the device comprises a plurality of rows of drilled holes (7) drilled in a dismantled arch structure from top to bottom, two protection shed frames (1) symmetrically arranged on the front side and the rear side of the dismantled arch bridge (2) and two slope protection structures respectively arranged on the front side and the rear side of the dismantled arch bridge (2), wherein the two protection shed frames (1) have the same structure and size and are symmetrically arranged on the front side and the rear side of the dismantled arch bridge (2), the longitudinal lengths of the two protection shed frames (1) are not less than 5m, and the two protection shed frames and the dismantled arch bridge (2) are fixedly connected into a whole;

the demolished arch bridge (2) is positioned between a left side slope and a right side slope (9), the demolished arch bridge (2) is vertically arranged and spans an existing railway line, an open cut tunnel (2-1) for the existing railway line to pass through is arranged below the middle part of the demolished arch bridge (2), and the two protective shed frames (1) are covered above the existing railway line;

each side slope protection structure comprises a left side slope protection frame and a right side slope protection frame (8) which are symmetrically arranged, the side slope protection frames (8) are vertically arranged and are arranged along the longitudinal length direction of the protection shed frame (1), and each side slope protection frame (8) is positioned at the slope foot of one side slope (9); each protection shed frame (1) is uniformly distributed between two side slope protection frames (8) of one side slope protection structure;

the top of the open cut tunnel (2-1) is arched, the left side wall and the right side wall of the open cut tunnel are vertical side walls which are arranged along the transverse bridge direction, an arch ring (2-3) is arranged at the top of the open cut tunnel (2-1), and the arch ring (2-3) is a plain concrete arch ring; the demolished arch bridge (2) is divided into a demolished arch-upper structure positioned above an arch ring (2-3) and an arch-lower structure positioned below the arch ring (2-3) by taking the arch ring (2-3) as a boundary, the arch-lower structure is supported on the ground, and both the demolished arch-upper structure and the demolition-lower structure are masonry structures made of grouted rubble; the arch structure is internally provided with a left vertical supporting column (2-2) and a right vertical supporting column (2-2) which are used for supporting an arch ring (2-3), the bottoms of the left side and the right side of the arch ring (2-3) are supported on one vertical supporting column (2-2), and a cavity between the two vertical supporting columns (2-2) is an open cut tunnel (2-1); the upper surface of the under-arch structure is a horizontal plane, and the upper surface of the under-arch structure is flush with the upper surface of the vertical supporting column (2-2);

the front side wall and the rear side wall of the dismantled arch bridge (2) are arranged in parallel and are both shed frame fixing side walls for fixing the protection shed frames (1), the shed frame fixing side walls are straight side walls which are arranged vertically and are arranged vertically with the vertical side walls, and the two protection shed frames (1) are arranged vertically with the shed frame fixing side walls; the vertical distance between the arch crown of the arch ring (2-3) and the upper surface of the arch bridge (2) to be dismantled is not more than 1 m; the length of the side slope protection frame (8) is greater than the longitudinal length of the protection shed frame (1), one end, close to the fixed side wall of the shed frame, of the side slope protection frame (8) is a protection frame starting end, and the protection frame starting end is tightly attached to the fixed side wall of the shed frame;

the multiple rows of the drill holes (7) are distributed from front to back along the transverse bridge direction, and the multiple rows of the drill holes (7) are uniformly distributed; each row of the drill holes (7) comprises a plurality of drill holes (7) which are distributed on the same vertical surface from left to right along the longitudinal bridge, and the plurality of drill holes (7) in each row of the drill holes (7) are uniformly distributed; all the drill holes (7) on the dismantled arch structure are distributed in multiple rows and multiple columns; each drill hole (7) is a vertical drill hole for injecting a static crushing agent, and the hole depth of each drill hole (7) is not more than 2 m; the vertical distance between the bottom of each drilling hole (7) above the arch ring (2-3) and the outer side wall of the arch ring (2-3) is 18-22 cm;

each protective shed frame (1) comprises two strip-shaped bases (1-2) which are symmetrically arranged at the left and right, an arched support frame which is supported on the two strip-shaped bases (1-2) and a protective shed which is erected outside the arched support frame, the two strip-shaped bases (1-2) are arranged on the same horizontal plane, the two strip-shaped bases are both horizontally arranged concrete bases, the two strip-shaped bases (1-2) are arranged in parallel, and the two strip-shaped bases and the fixed side wall of the shed frame are both vertically arranged; the bottoms of the left side and the right side of the arched support frame are supported on one strip foundation (1-2); the arched support frames and the protective shed are horizontally arranged, and the lengths of the protective shed and the two strip-shaped foundations (1-2) are the same as the longitudinal length of the arched support frames; the cross sections of the arched support frames and the protection shed are the same as the cross section of the open cut tunnel (2-1); the one end of arch support frame is for fixing support frame stiff end on the fixed lateral wall of rack, the support frame stiff end is rather than fixed the fixed lateral wall of rack is hugged closely.

2. The static crushing and dismantling construction structure of the existing overpass arch bridge according to claim 1, wherein: the distance between the front row and the rear row of the drill holes (7) adjacent to each other in the disassembled arch structure is 0.8-1.2 m, and the distance between two adjacent drill holes (7) in each row of the drill holes (7) is 0.4-0.6 m.

3. The static crushing and dismantling construction structure of the existing overpass arch bridge according to claim 1 or 2, wherein: the aperture of all the drill holes (7) in the dismantled arch structure is the same, and the aperture of each drill hole (7) is phi 36 mm-phi 46 mm.

4. The static crushing and dismantling construction structure of the existing overpass arch bridge according to claim 1 or 2, wherein: the side slope protection frame (8) comprises a longitudinal protection frame which is vertically arranged and a longitudinal protection plate (8-3) which is arranged on the outer side of the longitudinal protection frame, the longitudinal protection frame comprises a plurality of vertical supporting columns (8-1) which are arranged on the same vertical surface from front to back and an upper horizontal connecting rod (8-2) and a lower horizontal connecting rod (8-2) which are horizontally arranged, and each horizontal connecting rod (8-2) is fixedly connected with the vertical supporting columns (8-1); the vertical supporting columns (8-1) are fixedly connected with longitudinal protection plates (8-3) into a whole through horizontal connecting rods (8-2), the longitudinal protection plates (8-3) are vertically arranged, and the longitudinal protection plates and the longitudinal protection frame are arranged in parallel with the protection shed frame (1); the bottom of each vertical strut (8-1) is inserted into the soil body below the ground from top to bottom.

5. The static crushing and dismantling construction structure of the existing overpass arch bridge according to claim 1 or 2, wherein: the arched support frame comprises a plurality of profile steel arch frames (1-1) arranged from front to back and a plurality of longitudinal connecting pieces (1-3) fixed inside the arched support frame, wherein the plurality of longitudinal connecting pieces (1-3) are horizontally arranged and have the same length as the longitudinal length of the arched support frame, and the plurality of longitudinal connecting pieces (1-3) are arranged in parallel with the strip foundation (1-2) and are arranged along the inner contour line of the profile steel arch frames (1-1); the plurality of longitudinal connecting pieces (1-3) are all flat steel sections, each longitudinal connecting piece (1-3) is fixedly connected with a plurality of steel section arch frames (1-1) in the arch supporting frame, and the plurality of steel section arch frames (1-1) in the protective shed frame (1) are fixedly connected into a whole through the plurality of longitudinal connecting pieces (1-3); the structure and the size of a plurality of profile steel arch frames (1-1) in the arch support frame are the same and are uniformly distributed on the same horizontal plane, the plurality of profile steel arch frames (1-1) are distributed in parallel and are all vertically distributed with a strip-shaped foundation (1-2), the plurality of profile steel arch frames (1-1) are uniformly distributed and are all vertically distributed, and the bottoms of the left end and the right end of each profile steel arch frame (1-1) are supported on one strip-shaped foundation (1-2); each steel arch (1-1) is formed by bending a I-shaped steel, and the web plates of the I-shaped steel are vertically arranged;

each structural steel arch (1-1) comprises an upper arch (1-11) and two vertical upright posts (1-12) symmetrically distributed below the left side and the right side of the upper arch (1-11), and the upper arch (1-11) and the two vertical upright posts (1-12) in the middle of each structural steel arch (1-1) are uniformly distributed on the same vertical plane; the shape of the upper arch (1-11) is the same as that of the arch ring (2-3);

the shape of each steel arch (1-1) is the same as the cross section shape of the open cut tunnel (2-1); one steel arch (1-1) closest to an arch ring (2-3) in the arch support frame is a fixed side arch, an upper arch (1-11) of the fixed side arch is tightly attached to the arch ring (2-3), two vertical columns (1-12) of the fixed side arch are tightly attached to one vertical supporting column (2-2), and two strip-shaped bases (1-2) are located below the same side of the arch ring (2-3); each vertical upright post (1-12) of the fixed side arch is fixed on a vertical supporting post (2-2) which is close to the vertical upright post by a plurality of fasteners arranged from top to bottom, the outer end of each fastener extends out of a web plate of the fixed side arch, and the web plate of the fixed side arch is provided with a plurality of through holes for the fasteners to penetrate out;

the arched support frame is characterized in that a plurality of vertical upright posts (1-12) which are arranged from front to back in the arched support frame form a lower support, all upper arch frames (1-11) in the arched support frame form an arched support, and the arched support frame is formed by connecting one arched support and two lower supports which are symmetrically arranged below the left side and the right side of the arched support;

the protective shed is formed by connecting an arched ceiling erected on the arched support and two side shed bodies (1-7) which are vertically arranged, the two side shed bodies (1-7) are symmetrically arranged below the arched ceiling, and the arched ceiling and the two side shed bodies (1-7) are formed by splicing a plurality of shielding plates; the cross section of the protection shed is the same as that of the arched support frame.

6. The static crushing and dismantling construction structure of the existing overpass arch bridge according to claim 5, wherein: the arch rings (2-3) and the upper arch centering (1-11) are semicircular, the inner diameter of the upper arch centering (1-11) is 40-50 cm larger than that of the arch rings (2-3), and the height of the vertical upright post (1-12) in each profile steel arch centering (1-1) is the same as that of the vertical side wall in the open cut tunnel (2-1);

the clear distance between two vertical upright posts (1-12) in each profile steel arch (1-1) is 40-50 cm larger than the distance between two vertical side walls in the open cut tunnel (2-1).

7. The static crushing and dismantling construction structure of the existing overpass arch bridge according to claim 5, wherein: the steel arch frame (1-1) farthest away from the arch ring (2-3) in the arch support frame is an edge arch frame, a limiting frame (1-8) for limiting the protection shed is welded on the edge arch frame, the shape of the limiting frame (1-8) is the same as that of the steel arch frame (1-1), the limiting frame (1-8) is welded and fixed on the outer side of the edge arch frame, and the limiting frame (1-8) and the edge arch frame are arranged in parallel.

8. The static crushing and dismantling construction structure of the existing overpass arch bridge according to claim 5, wherein: the upper wing plates of all the profile steel arch frames (1-1) in the arched support frame form a support arch frame for supporting the protective shed, a plurality of connecting bolts (5) for connecting the protective shed are uniformly distributed on the upper wing plate of each profile steel arch frame (1-1) in the arched support frame, and the connecting bolts (5) are distributed along the contour line of the upper wing plate and are uniformly distributed on the same vertical plane; each connecting bolt (5) is vertically arranged with the outer side wall of the upper wing plate at the arrangement position thereof; and a plurality of bolt mounting holes for mounting connecting bolts (5) are formed in the upper wing plate of each profile steel arch (1-1) and the protective shed.

9. The static crushing and dismantling construction structure of the existing overpass arch bridge according to claim 5, wherein: the arched ceilings comprise a lower ceiling (1-9) and an upper ceiling (1-15) positioned right above the lower ceiling (1-9), the cross sections of the lower ceiling (1-9) and the upper ceiling (1-15) are arched, and the cross sections of the lower ceiling (1-9) and the upper ceiling (1-15) are both in the shape of an arch and the cross section of the arched bracket; the lower ceilings (1-9) are supported on the arch-shaped supports, the upper ceilings (1-15) are supported on the lower ceilings (1-9), and a layer of geotextile (1-13) is padded between the lower ceilings and the upper ceilings.

10. The static crushing and dismantling construction structure of the existing overpass arch bridge according to claim 5, wherein: a layer of horizontal steel plate (1-4) is paved on each strip-shaped foundation (1-2), each horizontal steel plate (1-4) is a strip-shaped steel plate, and each section steel arch frame (1-1) and the horizontal steel plate (1-4) supported by the section steel arch frame are fixedly connected in a welding mode;

the longitudinal connecting pieces (1-3) are channel steel with inward notches, and web plates of the longitudinal connecting pieces (1-3) are welded and fixed with the inner wall of the profile steel arch frame (1-1) into a whole.

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