CN115094793B - A protective demolition method for bridge piers in confined working space - Google Patents
A protective demolition method for bridge piers in confined working space Download PDFInfo
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- CN115094793B CN115094793B CN202210549689.8A CN202210549689A CN115094793B CN 115094793 B CN115094793 B CN 115094793B CN 202210549689 A CN202210549689 A CN 202210549689A CN 115094793 B CN115094793 B CN 115094793B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001681 protective effect Effects 0.000 title claims abstract description 10
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 5
- 230000001360 synchronised effect Effects 0.000 claims description 17
- 238000005553 drilling Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 13
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a protective dismantling method for bridge piers in a limited working space, which comprises the following steps of S1, constructing a temporary supporting frame and a full-cavity supporting frame working platform on a bearing platform, S2, transferring a supporting system of a girder from a supporting seat on a bent cap to the temporary supporting frame, S3, cutting the bent cap into bent cap concrete small blocks on the full-cavity supporting frame working platform, removing all the bent cap concrete small blocks on a top layer, S4, installing a movable portal frame on the full-cavity supporting frame working platform, removing the rest of the bent cap concrete small blocks in the bent cap, S5, horizontally cutting the joint of a pier column and the bearing platform into a plurality of pier column sections, S6, hoisting and removing all the pier column sections one by one through the movable portal frame and an automobile crane, S7, chiseling the concrete at the joint of the pier column and the bearing platform, and retaining original reinforcing steel bars of the pier column. The invention can perform protective dismantling on the bridge pier in a limited operation space, and has high construction efficiency.
Description
Technical Field
The invention relates to the technical field of pier dismantling. More particularly, the invention relates to a method for protecting and dismantling a bridge pier in a limited working space.
Background
In recent years, the development of the construction engineering in China is very rapid, and the concrete structure has become a main structural form of the foundation construction engineering due to the advantages of material saving, rapid construction, good durability and the like. The bridge is operated for many years, the bridge pier is inclined beyond the limit due to the action of external force, the upper component of the bridge is quite good, and under the condition that the bridge pier cannot be reinforced or rectified, only protective dismantling (namely, the girder and the components below the bearing platform are not damaged), so that the girders on two sides of the bridge pier to be dismantled are required to be temporarily supported, the bridge pier is usually dismantled, the problems of narrow construction space, difficult operation of an automobile crane, limited construction and the like are caused, the construction efficiency is influenced, and the aim of rush repair cannot be fulfilled.
Disclosure of Invention
It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later.
To achieve these objects and other advantages and in accordance with the purpose of the invention, a method for protecting and removing a pier in a limited working space is provided, comprising the steps of:
Step S1, a temporary support frame and a full-hall type support operation platform are built on a bearing platform of a bridge, wherein the temporary support frame is positioned below a main beam of the bridge, and the full-hall type support operation platform is positioned below a capping beam of the bridge;
S2, installing a synchronous jacking device at the top of the temporary support frame, jacking a main beam through the synchronous jacking device, and transferring a support system of the main beam from a support on a bent cap to the temporary support frame;
S3, cutting the bent cap into bent cap concrete blocks on the full-hall type support operation platform, moving each bent cap concrete block positioned on the top layer to the outer side of the vertical projection of the main beam on the full-hall type support operation platform, and hoisting and removing each bent cap concrete block by using an automobile crane;
S4, installing a movable portal frame on the full-span type support operation platform after the top layer of the bent cap is removed, moving the rest bent cap concrete small blocks in the bent cap to the outer side of the vertical projection of the main beam on the full-span type support operation platform through the movable portal frame, and hoisting and removing all the bent cap concrete small blocks through an automobile crane;
S5, horizontally cutting the part above the joint of the pier column and the bearing platform into a plurality of pier column sections along the height direction of the pier column on the full-hall type bracket operation platform;
Step S6, lifting and moving each pier column section to the outside of the vertical projection of the main beam on the full-hall type bracket operation platform through the movable portal frame, and lifting and removing each pier column section one by one through the automobile crane;
And S7, chiseling concrete at the joint of the pier stud and the bearing platform, and retaining the original reinforcing steel bars of the pier stud.
Preferably, in step S1, the temporary support frames are disposed on two sides of the capping beam, and the bottom of the temporary support frames is fixedly connected with the bearing platform.
Preferably, the synchronous jacking device is a hydraulic synchronous jacking system, and the synchronous jacking device on two sides of the capping beam synchronously jacks the main beam to convert the load of the beam body to the temporary support frame.
In the step S3, the bent cap is firstly divided into multiple layers along the horizontal direction, the height of each layer is 0.5m, and then each layer is cut into multiple bent cap concrete small blocks along the vertical direction, and the length of each bent cap concrete small block is 0.5-1 m.
Preferably, the full-hall type support operation platform is built around the pier stud, two ends of the full-hall type support operation platform extend out of the outer side of the main beam, and the top surface of the full-hall type support operation platform is not higher than the bottom surface of the capping beam.
Preferably, at least one temporary bracket is arranged on the full-hall type support operation platform, and the temporary bracket is arranged at the end part of the cover beam and is positioned at the outer side of the vertical projection of the main beam on the full-hall type support operation platform.
Preferably, each capping beam concrete small block located on the top layer is transversely moved to the temporary bracket through a chain block, the chain block is fixed on the temporary bracket, and then the capping beam concrete small blocks on the temporary bracket are hoisted and removed through the automobile crane.
Preferably, the movable portal frame is movable on the full-scale bracket work platform in a width direction of the main beam so as to move the capping beam concrete block and the pier column segment to an outside of a vertical projection of the main beam on the full-scale bracket work platform.
Preferably, the connection between the pier stud and the bearing in step S5 and step S7 comprises a pier stud located at a height of at least 1.5m above the bearing.
Preferably, in step S5, two blind holes are drilled in each pier stud segment, and the two blind holes are symmetrically arranged along the center of the pier stud segment.
The invention at least comprises the following beneficial effects:
According to the method for protecting and dismantling the bridge pier in the limited operation space, provided by the invention, the operation requirement in the limited space is met by arranging the temporary support frame and the full-hall type support operation platform, the temporary support frame temporarily supports the main girder, the capping beam and the pier column are cut and removed in a blocking manner on the full-hall type support operation platform, the transferring speed is improved, the overall construction efficiency is greatly improved, space and time are saved for the follow-up procedure of the first-aid repair of the construction, the influence of the construction operation is small, the main girder or the bearing platform is not damaged, and the protecting and dismantling of the bridge pier is realized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural view of the temporary support frame and the full-hall type support operation platform according to an embodiment of the present invention;
FIG. 2 is a schematic side view of a full-hall type stand work platform according to the above embodiment of the present invention;
FIG. 3 is a schematic view illustrating hanging and dismantling of a concrete block of a capping beam in the above embodiment of the present invention;
fig. 4 is a schematic structural view of the mobile gantry according to the above embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It should be noted that, in the following embodiments, unless otherwise specified, the experimental methods are conventional methods, and the reagents and materials are commercially available, unless otherwise specified, and in the description of the present invention, the terms "horizontal", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
As shown in fig. 1 to 4, the invention provides a method for removing the protection of a pier in a limited operation space, which comprises the following steps:
Step S1, a temporary support frame 2 and a full-hall type support operation platform 3 are built on a bearing platform 1 of a bridge, wherein the temporary support frame is positioned below a main beam 6 of the bridge, and the full-hall type support operation platform 3 is positioned below a capping beam 5 of the bridge;
Step S2, installing a synchronous jacking device at the top of the temporary support frame 2, jacking a main beam through the synchronous jacking device, and transferring a support system of the main beam 6 from a support on the bent cap 5 to the temporary support frame 2;
S3, cutting the bent cap 5 into bent cap concrete small blocks on the full-hall type support operation platform 3, moving each bent cap concrete small block to the outside of the vertical projection of the main beam 6 on the full-hall type support operation platform 3, and hoisting and removing each bent cap concrete small block through the automobile crane 9;
Step S4, after the top layer of the bent cap 5 is removed, a movable portal frame 10 is installed on the full-hall type support operation platform 3, the rest bent cap concrete small blocks in the bent cap 5 are moved to the outer side of the vertical projection of the main beam 6 on the full-hall type support operation platform 3 through the movable portal frame 10, and then all the bent cap concrete small blocks are hoisted and removed through an automobile crane 9;
s5, horizontally cutting the position above the joint of the pier column 4 and the bearing platform 1 into a plurality of pier column sections along the height direction of the pier column 4 on the full-hall type bracket operation platform 3;
Step S6, lifting and moving each pier column segment to the outside of the vertical projection of the main beam 6 on the full-hall type bracket operation platform 3 through the movable portal frame 10, and lifting and removing each pier column segment one by one through the automobile crane 9;
and S7, chiseling concrete at the joint of the pier column 4 and the bearing platform 1, and retaining original reinforcing steel bars of the pier column 4.
In this technical solution, the temporary supporting frame 2 and the full-hall type bracket work platform 3 need to be designed according to the structural dimensions of the pier to be removed. Preferably, the temporary support frame 2 adopts a few-pivot support, and the full-hall support operation platform adopts a disc buckle type full-hall support. The temporary support frame 2 and the full-hall type support operation platform 3 are arranged to meet the operation requirement in a limited space, the temporary support frame 2 temporarily supports the main beam 6, the cover beam 5 and the pier column 4 are cut and removed in a blocking mode on the full-hall type support operation platform 3, the transferring speed is improved, the overall construction efficiency is greatly improved, space and time are vacated for the follow-up working procedures of construction rush repair, the influence of construction operation is small, the main beam 6 or the bearing platform 1 is not damaged, and the purpose of protective dismantling is achieved. After the roof beam 5 is cut, the roof beam concrete block on the top layer is removed first, and an installation space is provided for the movable gantry 10. The movable portal frame 10 is arranged on the rest of the bent cap 5 in a straddling manner, and the rest of the bent cap concrete small blocks are lifted to the full-hall type bracket operation platform 3 through the movable portal frame 10. Wherein the cutting of the capping beam 5 and the abutment 4 in step S3 and step S5 may be performed by using a conventionally used wire saw.
In another embodiment, in step S1, the temporary support frames 2 are disposed on two sides of the capping beam 5, and the bottom of the temporary support frames 2 is fixedly connected with the bearing platform 1. Further, the synchronous jacking device is a hydraulic synchronous jacking system, and the girder 6 is synchronously jacked by the synchronous jacking devices on two sides of the bent cap 5, so that the girder load is converted to the temporary support frame 2. The hydraulic synchronous jacking system is a synchronous jacking system conventionally used in the field and comprises a computer control system, a hydraulic pump station, a displacement and pressure sensor, a hydraulic jack and the like
In another embodiment, in step S3, the capping beams 5 are firstly divided into multiple layers in the horizontal direction, the height of each layer is 0.5m, and then each layer is cut into multiple capping beam concrete small blocks in the vertical direction, and the length of each capping beam concrete small block is 0.5-1 m.
In another embodiment, the full-hall type bracket working platform 3 is built around the pier stud 4, and two ends of the full-hall type bracket working platform extend out of the outer side of the main beam 6, so that each capping beam concrete small block and each pier stud segment can be conveniently moved to the outer side of the vertical projection of the main beam 6 on the full-hall type bracket working platform 3, and the subsequent lifting and moving out of the full-hall type bracket working platform are conveniently carried out through the automobile crane 9. And the top surface of the full-hall type bracket operation platform 3 is not higher than the bottom surface of the bent cap 5, so as to provide an operation space for cutting and dismantling the bent cap 5.
In another embodiment, at least one temporary bracket 7 is provided on the full-hall type support operation platform 3, and the temporary bracket 7 is disposed at the end of the capping beam 5 and is located outside the vertical projection of the main beam 6 on the full-hall type support operation platform 3.
In order to facilitate removal of the capping beam concrete small blocks on the top layer of the capping beam 5, further, the capping beam concrete small blocks transversely move to the temporary bracket 7 through the chain block 8, the chain block 8 is fixed on the temporary bracket 7, and then the capping beam concrete small blocks on the temporary bracket 7 are hoisted and removed through the automobile crane 9.
In another embodiment, the mobile portal frame 10 is movable on the full-hall type stand work platform 3 in the width direction of the main girder 6 so as to move the capping beam concrete blocks and the pier column segments to the outside of the vertical projection of the main girder 6 on the full-hall type stand work platform 3. The movable portal frame 10 is a light and small-sized lifting device which is conventionally adopted in the field, and is provided with lifting devices, such as electric or manual hoists, and universal loading wheels are arranged under the supporting legs of the lifting devices, so that the movement requirement is met.
In another embodiment, the connection between the abutment 4 and the abutment 1 in step S5 and step S7 comprises an abutment post located at a height of at least 1.5m above the abutment. In the step S7, concrete at the joint of the pier column 4 and the bearing platform 1 is chiseled by adopting manual work or high-pressure water, and the reinforcing steel bars of the original pier are reserved so as to ensure the connection between the bearing platform 1 and the newly-built pier column.
In another embodiment, for easy lifting, step S5 further comprises drilling two blind holes in each pier column segment, wherein the two blind holes are symmetrically arranged along the center of the pier column segment. Preferably, the blind holes are punched in each pier stud segment by impact drilling, the depth of the holes is 20cm, and the aperture is 20cm. The blind holes are used for limiting the hoisting steel wire rope when the movable portal frame 10 is hoisted, so that the steel wire rope is prevented from sliding upwards.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (10)
1. The protective dismantling method for the bridge pier in the limited operation space is characterized by comprising the following steps of:
Step S1, a temporary support frame and a full-hall type support operation platform are built on a bearing platform of a bridge, wherein the temporary support frame is positioned below a main beam of the bridge, and the full-hall type support operation platform is positioned below a capping beam of the bridge;
S2, installing a synchronous jacking device at the top of the temporary support frame, jacking a main beam through the synchronous jacking device, and transferring a support system of the main beam from a support on a bent cap to the temporary support frame;
S3, cutting the bent cap into bent cap concrete blocks on the full-hall type support operation platform, moving each bent cap concrete block positioned on the top layer to the outer side of the vertical projection of the main beam on the full-hall type support operation platform, and hoisting and removing each bent cap concrete block by using an automobile crane;
S4, installing a movable portal frame on the full-span type support operation platform after the top layer of the bent cap is removed, moving the rest bent cap concrete small blocks in the bent cap to the outer side of the vertical projection of the main beam on the full-span type support operation platform through the movable portal frame, and hoisting and removing all the bent cap concrete small blocks through an automobile crane;
S5, horizontally cutting the part above the joint of the pier column and the bearing platform into a plurality of pier column sections along the height direction of the pier column on the full-hall type bracket operation platform;
Step S6, lifting and moving each pier column section to the outside of the vertical projection of the main beam on the full-hall type bracket operation platform through the movable portal frame, and lifting and removing each pier column section one by one through the automobile crane;
And S7, chiseling concrete at the joint of the pier stud and the bearing platform, and retaining the original reinforcing steel bars of the pier stud.
2. The method for protecting and dismantling the bridge pier in the limited working space according to claim 1, wherein in the step S1, the temporary supporting frames are arranged on two sides of the capping beam, and the bottoms of the temporary supporting frames are fixedly connected with the bearing platform.
3. The method for protecting and removing the bridge pier in the limited working space according to claim 2, wherein the synchronous jacking devices are hydraulic synchronous jacking systems, and the main girder is synchronously jacked by the synchronous jacking devices at two sides of the bent cap, so that the girder body load is converted to the temporary supporting frame.
4. The method for protecting and dismantling the bridge pier in the limited working space according to claim 1, wherein in the step S3, the capping beams are firstly divided into a plurality of layers in the horizontal direction, the height of each layer is 0.5m, and then each layer is cut into a plurality of capping beam concrete small blocks in the vertical direction, and the length of each capping beam concrete small block is 0.5-1 m.
5. The method for protecting and dismantling the bridge pier in the limited working space according to claim 1, wherein the full-hall type bracket working platform is built around the pier stud, two ends of the full-hall type bracket working platform extend out of the outer side of the main girder, and the top surface of the full-hall type bracket working platform is not higher than the bottom surface of the capping beam.
6. The method for protecting and removing the bridge pier in the limited working space according to claim 5, wherein at least one temporary bracket is arranged on the full-hall type bracket working platform, and the temporary bracket is arranged at the end part of the cover beam and is positioned outside the vertical projection of the main beam on the full-hall type bracket working platform.
7. The method for protecting and removing the bridge pier in the limited working space according to claim 6, wherein each of the capping beam concrete blocks positioned on the top layer is transversely moved to the temporary bracket through a chain block, the chain block is fixed on the temporary bracket, and then the capping beam concrete blocks on the temporary bracket are lifted and removed through the automobile crane.
8. The method for the protective demolition of a confined working space pier according to claim 1, wherein the movable portal frame is movable on the full-hall type bracket working platform in a width direction of the main girder so as to move the capping beam concrete block and the pier column section to an outside of a vertical projection of the main girder on the full-hall type bracket working platform.
9. The method for the protective demolition of the pier in the limited working space according to claim 1, wherein the connection between the pier stud and the abutment in the step S5 and the step S7 comprises the pier stud located at a height of at least 1.5m above the abutment.
10. The method for the protective demolition of a pier in a confined working space according to claim 1, wherein the step S5 further comprises drilling two blind holes in each pier segment, respectively, the two blind holes being symmetrically arranged along the center of the pier segment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210549689.8A CN115094793B (en) | 2022-05-20 | 2022-05-20 | A protective demolition method for bridge piers in confined working space |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210549689.8A CN115094793B (en) | 2022-05-20 | 2022-05-20 | A protective demolition method for bridge piers in confined working space |
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| CN115094793A CN115094793A (en) | 2022-09-23 |
| CN115094793B true CN115094793B (en) | 2024-12-27 |
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| CN116427304A (en) * | 2023-03-30 | 2023-07-14 | 北京市政建设集团有限责任公司 | Bridge demolishs breaker |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112746569A (en) * | 2021-01-14 | 2021-05-04 | 湖北省路桥集团有限公司 | Old bridge ecological demolition structure and construction method |
| CN113403968A (en) * | 2021-07-15 | 2021-09-17 | 广东省九域工程技术咨询有限公司 | Bridge pier underpinning method and underpinning structure |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003268722A (en) * | 2002-03-19 | 2003-09-25 | Takeshi Noguchi | Improvement work method for intersection and its adjacent part having bridge pier of viaduct on road median strip |
| JP4403579B2 (en) * | 2005-03-23 | 2010-01-27 | 株式会社ピーエス三菱 | Removal method of existing pier of overpass |
| JP6684314B2 (en) * | 2018-06-29 | 2020-04-22 | 株式会社ナベカヰ | Bridge pier removal method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112746569A (en) * | 2021-01-14 | 2021-05-04 | 湖北省路桥集团有限公司 | Old bridge ecological demolition structure and construction method |
| CN113403968A (en) * | 2021-07-15 | 2021-09-17 | 广东省九域工程技术咨询有限公司 | Bridge pier underpinning method and underpinning structure |
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