CN110984004A - Method for dismantling lower supporting structure of bridge - Google Patents
Method for dismantling lower supporting structure of bridge Download PDFInfo
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- CN110984004A CN110984004A CN202010054596.9A CN202010054596A CN110984004A CN 110984004 A CN110984004 A CN 110984004A CN 202010054596 A CN202010054596 A CN 202010054596A CN 110984004 A CN110984004 A CN 110984004A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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Abstract
The invention discloses a method for dismantling a lower supporting structure of a bridge, wherein the lower supporting structure comprises a bridge pier, a bearing platform and a pile foundation, the lower end part of the pile foundation is arranged in water, and the method mainly comprises the following steps: determining horizontal and vertical cutting positions of a pier; secondly, cutting the bridge piers in blocks; step three, carrying out bearing platform segmentation; fourthly, determining the elevation of the pile foundation cutting line; step five, cutting the pile foundation through a cutting machine, a vertical pipe, a fixed hoop and the like; and step six, hoisting the pile foundation and part of bearing platforms connected on the pile foundation off the water surface. The vertical equal cutting of the pier and the vertical cutting of the horizontal plane are convenient for hoisting; the pile foundation is cut underwater, the vertical pipe fixed by the upper fixing hoop and the lower fixing hoop is connected with the rope saw in a crossing mode in the cutting process, the accuracy of cutting of the rope saw is guaranteed, trial cutting is conducted before cutting, and the construction safety is further guaranteed.
Description
Technical Field
The invention relates to the field of bridge dismantling construction, in particular to a method for dismantling a lower supporting structure of a bridge.
Background
Along with the continuous extension of bridge construction, demolish some bridges that can not satisfy upper portion bearing and regional planning, still some old bridge that endangers, also need to demolish the change for the consideration of safety. The construction method for the lower supporting structure of the bridge in the bridge dismantling process is less, when the lower supporting structure relates to a pier, a bearing platform and a pile foundation, the dismantling scheme of the pier, the bearing platform and the pile foundation is determined to be an important link related to the bridge dismantling process, and particularly when the lower supporting structure is in water, the implementation of the dismantling scheme increases the difficulty, so that the comprehensive dismantling method for the lower supporting structure of the bridge needs to be provided.
Disclosure of Invention
The invention provides a method for dismantling a lower supporting structure of a bridge, which is used for solving the technical problems of determining a cutting scheme, implementing a hoisting scheme, performing underwater cutting construction and the like of the lower supporting structure of the bridge.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a method for demolising of bridge lower part bearing structure, wherein, lower part bearing structure contains the pier, connects in the cushion cap of pier below and connects in the pile foundation of cushion cap below, the tip sets up in aqueous under the pile foundation, and concrete step is as follows:
cleaning a structure which is removed in advance above a pier, measuring the height from the pier to a bearing platform and the length and width of the pier, and determining the horizontal cutting position and the vertical cutting position of the pier by combining the cross section form of the pier;
step two, erecting an operation platform on the bearing platform, cutting the bridge piers in blocks, hoisting the bridge piers by using a floating crane, cutting the bridge piers from top to bottom, and correspondingly adjusting the height of the operation platform from high to low until the operation platform is removed after the integral cutting of the bridge piers is finished;
step three, vertically dividing the bearing platform, performing underwater or overwater operation through a cutting machine borne by the engineering ship, and cutting off the part, which is not connected with the pile foundation, below the bearing platform;
after the bearing platform is dismantled, determining the elevation of the pile foundation cutting line according to the design minimum navigation water level requirement, and performing underwater horizontal cutting on the pile foundation through a rope type cutting machine;
step five, when the pile foundation is cut, arranging a first fixed hoop below the elevation of the pile foundation cutting line, connecting and fixing two vertical pipes with the first fixed hoop, arranging a second fixed hoop on an engineering ship, connecting and fixing the upper parts of the two vertical pipes with the second fixed hoop, placing a cutting machine on the engineering ship, and lowering a rope saw on the cutting machine to the elevation of the pile foundation cutting line after penetrating through the vertical pipes to perform cutting operation;
and step six, hoisting by using a floating crane, hoisting the pile foundation and part of the bearing platform connected with the pile foundation off the water surface, then removing the first fixed hoop and the vertical pipe, extracting the rope saw, and then performing cutting construction on the next pile foundation until all the pile foundations are completely removed.
Further, when the vertical direction of the pier in the first step is cut, carrying out equal-height layered cutting; when the cross section of the pier is cut, the pier body vertical cutting line is symmetrically divided by combining the section form of the pier, and the pier body vertical cutting line is arranged at the connecting part or the structural weak part of the structural plate.
And further, in the second step, a portal support or a tubular support is arranged on the bearing platform along the pier body of the pier to form an operation platform for cutting and drilling, and a pedestrian ladder is arranged on the operation platform.
Further, in the second step, when the bridge pier is horizontally cut in a vertically layered mode, the bridge pier is cut and is simultaneously driven into the horizontal cutting line through the steel wedge.
Further, in the second step, before each block of the bridge pier is cut and separated, two lifting holes are symmetrically arranged at two corners of the upper side end of each block; the lifting holes are two tangent circles and are communicated to form a connecting ring hole.
Furthermore, in the third step, the height direction of the bearing platform is not layered, and the distribution conditions of the vertical cutting lines of the bearing platform are divided into two categories, wherein one category is that the lower part of the bearing platform is not connected with the pile foundation, and the other category is that the lower part of the bearing platform is connected with the pile foundation; wherein the cap portion atop the pile foundation is cut with the pile foundation.
Further, in the fourth step, the pile foundation cutting line in the navigation hole range takes the navigation design water level depth as a reference design surface, and the pile foundation cutting line elevation in the non-navigation hole range takes a river bed or the ground as a reference design surface.
Further, to step five in the rope saw loop through pulley on cutting machine, one side standpipe top, one side standpipe bottom pulley, pile foundation line of cut elevation height, opposite side standpipe bottom pulley, opposite side standpipe, the pulley on the opposite side standpipe top, finally with the end butt joint of the rope saw on the cutting machine.
Furthermore, in the sixth step, when the pile foundation is hoisted, a bearing platform on the top of the pile foundation is bound by two steel wire ropes, then the pile foundation is cut underwater, the pile foundation is lifted slowly after being cut off, and the cutting rope saw and the pile foundation are hoisted to the shore and then are dismantled.
Further, in the sixth step, when the rope saw is fixed and cutting is started, trial cutting is performed, so that a diver can launch to check the stability of the first fixing hoop, the accuracy of the position of the lifting point and the tightness of the first fixing hoop locking pile foundation.
The invention has the beneficial effects that:
1) according to the invention, the piers are divided into a plurality of plates by vertically cutting the piers at equal height and horizontally cutting the piers vertically, so that the piers are convenient to hoist, and the arrangement of the operating platform on the bearing platform saves the construction site, is convenient to cut the piers, and can effectively save the construction time;
2) according to the invention, through classification treatment on the bearing platforms, the part of the bearing platform which is not connected below is cut and removed, so that on one hand, the bearing platform is convenient to cut and lift, and on the other hand, the bearing platform is beneficial to lifting and fixing when the pile foundation is dismantled;
3) according to the invention, the pile foundation is cut underwater, the rope saw is connected in a penetrating manner through the vertical pipes fixed by the upper and lower fixing hoops in the cutting process, the cutting accuracy of the rope saw is ensured, and trial cutting is carried out before cutting, so that the construction safety is further ensured;
in addition, the segmented lower supporting structure is lifted and transported under the coordination of equipment such as a floating crane, an engineering ship, a cutting machine and the like, so that the construction time can be effectively saved, and the construction efficiency is improved; additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention; the primary objects and other advantages of the invention may be realized and attained by the instrumentalities particularly pointed out in the specification.
Drawings
FIG. 1 is a schematic view of a bridge substructure connection;
fig. 2 is a schematic view of the erection of a pier cutting operation platform;
FIG. 3 is a vertical cutting line distribution diagram of a pier;
FIG. 4 is a view of the riser hoist structure;
FIG. 5 is a schematic view of a bearing platform cut;
FIG. 6 is a top cut view of the platform;
FIG. 7 is a schematic view of pile foundation cutting;
FIG. 8 is a detailed A node diagram;
fig. 9 is a detailed diagram of a node B.
Reference numerals: 1-pier, 2-bearing platform, 3-pile foundation, 4-0 block, 5-operation platform, 6-pier body vertical cutting line, 7-vertical plate, 8-lifting hole, 9-bearing platform vertical cutting line, 10-pile foundation cutting line, 11-first fixed hoop, 12-vertical pipe, 13-engineering ship, 14-cutting machine, 15-rope saw, 16-second fixed hoop and 17-pulley.
Detailed Description
Taking a certain river-crossing bridge as an example, a bridge lower structure arranged in a river is dismantled, as shown in fig. 1, the bridge lower structure comprises a pier 1, a lower bearing platform 2 of the pier 1 and a pile foundation 3 connected with the lower part of the bearing platform 2, wherein a No. 0 block 4 is connected above the pier 1; as shown in fig. 3, the pier 1 is a thin-wall hollow pier, the thickness of the pier body is 4.2m, the width of the pier body is 10.42m, and the cross section of the pier 1 is of a double-hole structure; as shown in fig. 5 and 6, the size of the bearing platform 2 at the lower part of the pier 1 is 11.36m long by 5.5m wide by 2m thick, 8 pile foundations 3 are distributed at intervals at the lower part of the bearing platform 2, and the arrangement mode of the pile foundations 3 is two rows, namely four rows in the front and the back.
With reference to fig. 1 to 9, a method for removing a supporting structure at a lower portion of a bridge is further described, which includes the following steps,
cleaning a pre-removed No. 0 block 4 above a pier 1, and after the No. 0 block 4 on the upper part of the pier 1 is cut off, keeping the residual height of a pier body at 15.25-16.85 m; measure pier 1's length and width again, combine pier 1's cross section form, the pier shaft adopts the cutting of piecemeal, the pier shaft sets up 3 horizontal kerfs in height, equally divide into 4 layers with the pier shaft, as shown in fig. 3, during pier 1's cross section cutting, its pier shaft vertical cut line 6 combines pier 1's cross section form symmetry to be cut apart, set up the junction or the weak department of structure at the structure plate respectively, from this, pier shaft vertical cut line 6 cuts the pier shaft into 7 risers 7 at every layer, and in pier shaft whole cutting, the highest riser 7 sections is 5.6m, heaviest weight section weight is for being about 43.2 t.
Before cutting, water in the pier body is pumped by a water pump, and when the pier 1 is horizontally cut in a vertically layered mode, steel wedges are used for driving the water into horizontal cutting lines while cutting, so that the segments are prevented from sinking and clamping chains; electricity is used for generating electricity by adopting a generator, and the generator is placed on the floating crane; the river water is directly pumped by a submersible pump.
Step two, as shown in fig. 2, a portal support operation platform 5 is erected on the bearing platform 2 along the pier body of the pier 1, and a pedestrian ladder is arranged on the operation platform 5 to facilitate construction; cutting the pier 1 in blocks and arranging hoisting holes 8, arranging at least 2 hoisting holes 8 on each vertical plate 7, and hoisting by using a floating crane; the cutting of the pier 1 is carried out from top to bottom, the height of the operating platform 5 is correspondingly adjusted from high to low, and the operating platform 5 is dismantled until the integral cutting of the pier 1 is completed.
As shown in fig. 4, before each cutting and separating of each pier 1, hanging holes 8 are symmetrically arranged at two corners of the upper side end of each vertical plate 7; the hanging holes 8 are two tangent circles and are communicated to form a connecting ring hole.
And step three, vertically dividing the bearing platform 2, performing underwater or overwater operation by using a cutting machine 14 borne by an engineering ship 13, and cutting off the part, which is not connected with the pile foundation 3, below the bearing platform 2.
The cutting vertical direction 2m of the bearing platform 2 is not divided into blocks, the rope type cutting machine is used for cutting the bearing platform 2 into blocks in an underwater cutting mode, as shown in fig. 6, the plane of the bearing platform 2 is divided into 11 blocks according to the distribution condition of the pile foundation 3, the distribution condition of the vertical cutting lines 9 of the bearing platform is divided into two categories, one category is that the lower part of the bearing platform 2 is not connected with the pile foundation 3, and the other category is that the lower part of the bearing platform 2 is connected with the pile foundation 3; wherein the part of the cap 2 atop the pile foundation 3 is cut with the pile foundation 3.
The cutting steps of the bearing platform 2 are as follows:
a, fixing the rope type cutting machine on an engineering ship 13;
b, the diver launches the cutting rope to penetrate through the bearing platform 2;
c, cutting by adopting a rope type cutting machine;
d, pre-cutting each partitioned surface of the bearing platform 2 through a cutting machine 14, and cutting one surface in ②, ④ and ⑥ segmentation;
e, hoisting the block section by using the steel wire rope of the floating crane, and tightening the steel wire rope;
f, hoisting the block sections, transferring and cutting the next block section.
After the bearing platform 2 is dismantled, determining the elevation of the pile foundation cutting line 10 according to the design minimum navigation water level requirement, and cutting the pile foundation 3 in the underwater horizontal direction through a rope type cutting machine; the pile foundation 3 which is not in the range of the navigation hole is not dismantled, and the pile foundation 3 is already 2m below the ground after the bearing platform 2 is dismantled, so that the dismantling can be omitted; the pile foundation cutting line 10 in the range of the navigation hole is controlled to be 8 meters below the ground, namely the removal elevation is controlled to be below-7.526 meters.
The design elevation of-7.6 m is the elevation of 10 cutting lines of the pile foundation, the elevation of the river bed surface in the river bed range of the pile foundation 3 is lower than-7.6 m according to the elevation of the river bed surface, and reverse excavation construction is not needed, the elevation of the pile top at the bottom of the bearing platform 2 is about +0.3, the length of the cut pile foundation 3 is 7.9m, the maximum weight of the cut pile foundation 3 is calculated by considering that the pile foundation casing is 0.3 m, the block weight of the pile foundation 3 is 47.45t, the block weight of the pile top bearing platform 2 is 42t, 89.45t is summed up, and the pile top bearing platform 2 is lifted together with the block weight; the pile foundation 3 adopts rope cutting machine underwater cutting, 200t floating crane cooperation is laid the pile foundation to the riverbed, and then the tie is laid and is lifted by crane the pile foundation 3 that the cutting finishes.
Step five, as shown in fig. 7, when the pile foundation 3 is cut, arranging a first fixing hoop 11 below the pile foundation cutting line 10, connecting and fixing two vertical pipes 12 and the first fixing hoop 11, installing a second fixing hoop 16 on an engineering ship 13, and connecting and fixing the upper parts of the two vertical pipes 12 and the second fixing hoop 16; a cutting machine 14 is placed on the engineering ship 13, and a rope saw 15 on the cutting machine 14 penetrates through the vertical pipe 12 and is lowered to the elevation of the pile foundation cutting line 10 to perform cutting operation; the first fixing hoop 11 and the second fixing hoop 16 are made of steel plates or hard plastics, the vertical pipe 12 is made of steel pipes with the diameter of 10mm, and the height of the vertical pipe is 12 m.
During installation and construction of the pile foundation 3 cutting rope saw 15
a, the position of a first fixed hoop 11 is mainly arranged 20cm below the elevation of the pile foundation cutting line 10, a diver takes the first fixed hoop 11 and an installation tool to launch, and the first fixed hoop 11 is installed 20cm below the determined elevation of the pile foundation cutting line 10;
b, allowing a diver to launch to fix the two processed steel pipes on the fixed first fixing hoops 11 respectively, and installing pulleys 17;
c, the rope type cutting machine is placed on the engineering ship 13, the engineering ship 13 is anchored and fixed, and the second fixing hoop 16 is installed on the engineering ship 13 and is fixed with the vertical pipe 12.
As shown in fig. 8 and 9, the rope saw 15 passes through the cutter 14, the pulley 17 on the top of the one side vertical pipe 12, the pulley 17 on the bottom of the one side vertical pipe 12, the elevation of the pile foundation cutting line 10, the pulley 17 on the bottom of the other side vertical pipe 12, the pulley 17 on the top of the other side vertical pipe 12, and finally abuts against the end of the rope saw 15 on the cutter 14.
Step six, binding a bearing platform 2 on the top of a pile foundation 3 by using two steel wire ropes, pre-lifting a pile head before cutting, checking whether the pile head meets the lifting force requirement, then performing underwater cutting on the pile foundation 3, and performing trial cutting when the rope saw 15 is fixed and cutting begins; therefore, a diver enters water to check the stability of the first fixing hoop 11, the accuracy of the lifting point position and the tightness of the first fixing hoop 11 locking pile foundation 3.
After 3 cuts off of pile foundation, slowly lift pile foundation 3, after 3 cuts of pile foundation are accomplished, lift by crane through the floating crane, hang pile foundation 3 and pile foundation 3 on the part cushion cap 2 of connecting from the surface of water, then remove first fixed hoop 11, standpipe 12 to take out rope saw 15, carry out next 3 cutting constructions of pile foundation again, until all 3 demolishs of pile foundation and finish.
The hoisting of the pile foundation and the configuration of the rope are calculated as follows:
1) pile foundation weight calculation
When the elevation minus 7.6m is the elevation of the pile foundation cutting line 10, the elevation of the pile top is about +0.3 after the bearing platform 2 is cut, and the length L of the cut pile foundation 3 is =7.9 m; the diameter of the pile foundation 3 is 1.5m, the diameter of a pile casing for constructing the pile foundation 3 is 1.7m in consideration of the actual construction, and the pile foundation concrete in the pile casing is 1.7 m; the wall thickness of the pile casing is 1.2cm, the wall thickness is designed to be 0.6cm in consideration of steel corrosion, and the pile casing is arranged below a rock surface; namely, the weight of the current pile foundation 3 is considered as the diameter of 1.7m, and the weight of the casing is added;
the total weight of the pile foundation G = the weight of the pile foundation G1+ the weight of the steel casing G2=44.8+2.64=47.45t, the block weight of the upper bearing platform 2 of the pile foundation 3 is 42t, and the block weight formed by the pile foundation 3 and the upper bearing platform 2 is 89.45 t.
2) Wire rope arrangement
According to the calculation, the maximum weight of the pile foundation 3 is 89.45t, and four steel wire ropes are adopted for vertical hoisting:
the bearing weight of a single steel wire rope is 89.45t/4=22.4t, 8-10 times of safety factor is considered when the steel wire rope is bundled and hoisted, the total breaking force of the steel wire rope needs to be 22.4 x 10 x 8=1792kn, the hoisting steel wire rope generally adopts a 6 x 37 wire rope, the tensile strength of the steel wire rope is 1700MPa, a steel wire rope parameter table is checked, a 56mm diameter steel wire rope can meet the requirement, and the project adopts a 6 x 37 wire rope 1700 MPa.
The key points of the invention are mainly cutting and hoisting, in order to ensure accurate cutting position and smooth construction, the fixation of the rope saw 15 is the key point, when the rope saw 15 is fixed and starts to cut, trial cutting is carried out, and a diver enters water to check the stability of the fixed hoop and the like; the hoisting engineering should ensure the accurate position of the hoisting point and whether the hoop locks the pile foundation 3.
In addition, after the bridge substructure is cut and separated in blocks, the bridge substructure is lifted to the shore by using a floating crane, a p350 excavator is used, a gun head is matched at the same time, the blocks are crushed, and after the blocks are crushed, concrete slag is loaded and transported to a stockyard from the shore and a bridge is facilitated by using the excavator.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.
Claims (10)
1. The utility model provides a method for demolising bridge lower part bearing structure, its characterized in that, lower part bearing structure contain pier (1), connect in cushion cap (2) of pier (1) below and connect in pile foundation (3) of cushion cap (2) below, the tip sets up in aqueous under pile foundation (3), and concrete step is as follows:
cleaning a structure which is removed in advance above a pier (1), measuring the height from the pier (1) to a bearing platform (2) and the length and width of the pier (1), and determining the horizontal cutting position and the vertical cutting position of the pier (1) by combining the cross section form of the pier (1);
step two, erecting an operation platform (5) on the bearing platform (2), cutting the pier (1) in blocks, hoisting the pier by using a floating crane, cutting the pier (1) from top to bottom, and correspondingly adjusting the height of the operation platform (5) from high to low until the integral cutting of the pier (1) is finished, and then dismantling the operation platform (5);
step three, vertically dividing the bearing platform (2), performing underwater or overwater operation by a cutting machine (14) borne by an engineering ship (13), and cutting off the part, which is not connected with the pile foundation (3), below the bearing platform (2);
fourthly, after the bearing platform (2) is dismantled, determining the elevation of the pile foundation cutting line (10) according to the design minimum navigation water level requirement, and performing underwater horizontal cutting on the pile foundation (3) through a rope type cutting machine;
step five, when the pile foundation (3) is cut, a first fixing hoop (11) is arranged below the elevation of the pile foundation cutting line (10), two vertical pipes (12) are fixedly connected with the first fixing hoop (11), a second fixing hoop (16) is installed on an engineering ship (13), the upper parts of the two vertical pipes (12) are fixedly connected with the second fixing hoop (16), a cutting machine (14) is placed on the engineering ship (13), and a rope saw (15) on the cutting machine (14) penetrates through the vertical pipes (12) to be placed at the elevation of the pile foundation cutting line (10) for cutting operation;
and step six, hoisting by using a floating crane, hoisting the pile foundation (3) and part of the bearing platform (2) connected with the pile foundation (3) from the water surface, then removing the first fixing hoop (11) and the vertical pipe (12), drawing out the rope saw (15), and then performing cutting construction on the next pile foundation (3) until all the pile foundations (3) are removed.
2. The method for demolishing a supporting structure at the lower part of a bridge according to claim 1, wherein, when the vertical direction of the pier (1) in the first step is cut, the equal-height layered cutting is performed; when the cross section of the pier (1) is cut, the pier body vertical cutting line (6) is symmetrically cut by combining the cross section of the pier (1), and the pier body vertical cutting line (6) is arranged at the joint of the structural plate or the weak position of the structure.
3. A method for dismantling the supporting structure of the lower part of the bridge according to claim 1, wherein for step two, a portal frame or a tubular frame is provided on the bearing platform (2) along the pier body of the bridge pier (1) to form an operating platform (5) for cutting and drilling, and a pedestrian ladder is provided on the operating platform (5).
4. The method for removing the supporting structure at the lower part of the bridge according to claim 1, wherein in the second step, when the pier (1) is horizontally cut in a vertically layered manner, steel wedges are used for driving the cut edges into the horizontal cut lines.
5. A demolition method of a bridge lower support structure according to claim 1, wherein in the second step, before each block of the pier (1) is cut and separated, two hanging holes (8) are symmetrically arranged at two corners of each upper side end; the lifting holes (8) are two tangent circles and are communicated to form a connecting ring hole.
6. The method for dismantling the supporting structure at the lower part of the bridge according to claim 1, wherein in step three, the height direction of the bearing platform (2) is not layered, and the distribution of the vertical cutting lines (9) of the bearing platform is divided into two categories, one category is that the lower part of the bearing platform (2) is not connected with the pile foundation (3), and the other category is that the lower part of the bearing platform (2) is connected with the pile foundation (3); wherein the part of the bearing platform (2) on the top of the pile foundation (3) is cut along with the pile foundation (3).
7. The method for dismantling the supporting structure of the lower part of the bridge according to claim 1, wherein in the fourth step, the pile foundation cutting line (10) in the navigation hole range is designed with the navigation design water level depth as a reference design surface, and the elevation of the pile foundation cutting line (10) in the non-navigation hole range is designed with the riverbed or the ground as a reference design surface.
8. The method for dismantling the lower supporting structure of the bridge according to claim 1, wherein for step five, the rope saw (15) is sequentially connected with the cutting machine (14), the pulley (17) on the top of the vertical pipe (12) on one side, the pulley (17) at the bottom of the vertical pipe (12) on one side, the elevation of the pile foundation cutting line (10), the pulley (17) at the bottom of the vertical pipe (12) on the other side, the pulley (17) on the top of the vertical pipe (12) on the other side, and finally the end of the rope saw (15) on the.
9. The method for dismantling the supporting structure at the lower part of the bridge according to claim 1, wherein in the sixth step, when the pile foundation (3) is hoisted, the two steel wire ropes are firstly used for binding the bearing platform (2) on the top of the pile foundation (3), then the pile foundation (3) is cut underwater, the pile foundation (3) is slowly lifted up after being cut off, and the cutting rope saw (15) is hoisted to the shore together with the pile foundation (3) and then dismantled.
10. A method of demolishing a supporting structure at the lower part of a bridge according to claim 1, wherein for the sixth step, when the rope saw (15) is fixed and the cutting is started, trial cutting is performed and the stability of the first fixing clip (11), the accuracy of the position of the hanging point and the tightness of the first fixing clip (11) to lock the pile foundation (3) are checked.
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| CN111779925A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Bridge bottom measuring part mounting equipment |
| CN112323657A (en) * | 2020-10-30 | 2021-02-05 | 中铁大桥局集团有限公司 | Integrated prefabricated bridge dismantling machine and prefabricated bridge dismantling method |
| CN112391953A (en) * | 2020-12-07 | 2021-02-23 | 中铁上海工程局集团有限公司 | Underwater pier column dismantling method |
| CN113718667A (en) * | 2021-09-02 | 2021-11-30 | 中铁二十局集团第三工程有限公司 | Existing pier breaking method and bridge support replacing construction process |
| CN114737567A (en) * | 2022-03-18 | 2022-07-12 | 北京住总集团有限责任公司 | Underground closed space middle column cutting method |
| CN115075271A (en) * | 2022-07-08 | 2022-09-20 | 四川公路桥梁建设集团有限公司 | Underwater dismantling method for steel-concrete structure of steel cofferdam |
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| CN111779925A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Bridge bottom measuring part mounting equipment |
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| CN112391953A (en) * | 2020-12-07 | 2021-02-23 | 中铁上海工程局集团有限公司 | Underwater pier column dismantling method |
| CN113718667A (en) * | 2021-09-02 | 2021-11-30 | 中铁二十局集团第三工程有限公司 | Existing pier breaking method and bridge support replacing construction process |
| CN114737567A (en) * | 2022-03-18 | 2022-07-12 | 北京住总集团有限责任公司 | Underground closed space middle column cutting method |
| CN114737567B (en) * | 2022-03-18 | 2024-02-27 | 北京住总集团有限责任公司 | Underground closed space intermediate column cutting method |
| CN115075271A (en) * | 2022-07-08 | 2022-09-20 | 四川公路桥梁建设集团有限公司 | Underwater dismantling method for steel-concrete structure of steel cofferdam |
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