CN117306404A - Unloading construction method - Google Patents
Unloading construction method Download PDFInfo
- Publication number
- CN117306404A CN117306404A CN202311327268.1A CN202311327268A CN117306404A CN 117306404 A CN117306404 A CN 117306404A CN 202311327268 A CN202311327268 A CN 202311327268A CN 117306404 A CN117306404 A CN 117306404A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- girder
- pipe pile
- spandrel girder
- construction method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000010276 construction Methods 0.000 title claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 104
- 239000010959 steel Substances 0.000 claims abstract description 104
- 244000035744 Hura crepitans Species 0.000 claims abstract description 13
- 238000003466 welding Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000002787 reinforcement Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
Abstract
The invention relates to an unloading construction method, which is constructed at the bottom of a box girder, wherein a plurality of steel pipe piles are arranged below the box girder, a spandrel girder is arranged at the top of each steel pipe pile, and a supporting column for supporting the box girder is arranged at the top of each spandrel girder, and the construction method comprises the following steps: selecting the steel pipe pile to be unloaded, and removing the support column at the top of the steel pipe pile to be unloaded; lifting the spandrel girder; cutting off part of the steel pipe pile to be unloaded, and welding a steel plate on the top of the cut steel pipe pile; lowering the spandrel girder so that the spandrel girder is arranged at the top of the steel plate, and welding and fixing the spandrel girder and the steel plate; constructing a load sand box at the top of the spandrel girder, and arranging a fixed column between the load sand box and the girder; and the steps are repeated until the construction of a plurality of steel pipe piles is completed, the operation is simple, and the application range is wide.
Description
Technical Field
The invention relates to the field of building engineering, in particular to an unloading construction method.
Background
Along with modern urban development, the requirements for view improvement are more and more, bridge designs are more and more diversified, and as the bending moment of the beam is generally smaller than that of a continuous beam or a simply supported beam with the same span under the vertical load action of the steel structure, the spanning capacity of the beam is larger than that of the bridge, and the steel structure gradually walks into the field of view. Steel structure bridges are usually manufactured in factories and assembled on site.
The middle part of the large-span steel beam needs to be additionally provided with a temporary support, the wading section usually adopts a temporary steel pipe support in water, in order to ensure construction safety and support stability, a form of steel pipe piles, a scissor stay, a spandrel girder and a support column is adopted, the length of the support column is usually not too long, so that the support column is prevented from being inclined and deformed due to temperature deformation of the steel beam, and therefore, the problem that the support is unloaded when the pre-camber of part of the steel structure bridge is large is caused (the support column is completely removed and the pre-camber release height is not met).
Meanwhile, the steel structure bridge has longer construction period (possibly spanning summer and winter and seasonal flood season), small rigidity and short construction period and large rigidity relative to the cast-in-situ beam body, and the unloading sand box cannot be arranged on the support frame body in advance so as to prevent displacement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an unloading construction method, which is used for cutting off a steel pipe pile to meet the release height of a pre-arch.
The technical scheme for achieving the purpose is that the unloading construction method is constructed at the bottom of a box girder, a plurality of steel pipe piles are arranged below the box girder, a bearing girder is arranged at the top of each steel pipe pile, a supporting column for supporting the box girder is arranged at the top of each bearing girder, and the construction method comprises the following steps:
selecting the steel pipe pile to be unloaded, and removing the support column at the top of the steel pipe pile to be unloaded;
lifting the spandrel girder;
cutting off part of the steel pipe pile to be unloaded, and welding a steel plate on the top of the cut steel pipe pile;
lowering the spandrel girder so that the spandrel girder is arranged at the top of the steel plate, and welding and fixing the spandrel girder and the steel plate;
constructing a load sand box at the top of the spandrel girder, and arranging a fixed column between the load sand box and the girder;
repeating the steps until the construction of a plurality of steel pipe piles is completed.
Further, the plurality of steel pipe piles are oppositely arranged, a distribution beam is arranged between the two oppositely arranged steel pipe piles, and the distribution beam is positioned between the spandrel girder and the steel pipe piles;
cutting off a distribution beam between the steel pipe pile to be unloaded and another steel pipe pile before the support column is cut off;
and after lifting the spandrel girder, cutting off the cut distribution girder at the top of the steel pipe pile to be unloaded.
Further, before the support columns are cut off, reinforcement is performed on the support columns at the tops of the remaining steel pipe piles.
Further, after the steel pipe pile is cut, a stiffening rib is dared to be connected to the side portion of the cut steel pipe pile.
Further, the spandrel girder is lifted or lowered by the chain block.
Further, after the support columns are cut off, the whole process of monitoring the elevation change of the box girder is carried out.
Further, the length of the fixing column is matched with the distance between the load sand box and the box girder.
Further, the cutting thickness of the steel pipe pile is determined according to the actual construction condition on site.
Further, the load flask is disposed in the center of the spandrel girder.
Compared with the prior art, the invention has the following beneficial effects:
the rest support columns are reinforced firstly to prevent danger in the use process, and redundant parts of the steel pipe piles are cut off to meet the requirement of the pre-arch release height.
Drawings
FIG. 1 is an overall block diagram of an unloading construction method of the present invention.
Fig. 2 is an effect diagram of cutting a distribution beam in an unloading construction method according to the present invention.
Fig. 3 is an effect diagram of the unloading construction method of the present invention for cutting off the support column.
Fig. 4 is an effect diagram of the unloading construction method of the present invention for cutting out the distribution beam.
Fig. 5 is an effect diagram of the unloading construction method according to the present invention for cutting out a steel pipe pile.
Fig. 6 is an effect diagram of a lowering spandrel girder of an unloading construction method of the present invention.
FIG. 7 is a diagram showing the construction effect of a load flask according to the unloading construction method of the present invention.
Fig. 8 is a construction completion view of an unloading construction method of the present invention.
Legend description: 1. a box girder; 2. a steel pipe pile; 3. a spandrel girder; 4. a support column; 5. a distribution beam; 6. an operation platform; 7. loading a sand box; 8. and fixing the column.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
Referring to fig. 1, 3, 5, 6, 7 and 8, an unloading construction method is constructed at the bottom of a box girder 1, a plurality of steel pipe piles 2 are arranged below the box girder 1, a spandrel girder 3 is arranged at the top of the steel pipe piles 2, a supporting column 4 for supporting the box girder 1 is arranged at the top of the spandrel girder 3, and the construction method comprises the following steps: selecting the steel pipe pile 2 to be unloaded, and cutting off the support column 4 at the top of the steel pipe pile 2 to be unloaded; lifting the spandrel girder 3; cutting off part of the steel pipe pile 2 to be unloaded, and welding a steel plate on the top of the cut steel pipe pile 2; lowering the spandrel girder 3 so that the spandrel girder 3 is arranged at the top of the steel plate, and welding and fixing the spandrel girder 3 and the steel plate; constructing a load sand box 7 at the top of the spandrel girder 3, and arranging a fixed column 8 between the load sand box 7 and the girder 1; repeating the steps until the construction of a plurality of steel pipe piles 2 is completed.
In the present invention, a preferred embodiment is: an operation platform 6 is arranged on two adjacent steel pipe piles 2, the height of the operation platform 6 is lower than that of the steel pipe piles 2 after being cut off, constructors can conveniently construct the steel pipe piles 2 through the operation platform 6, and in order to ensure the safety during construction operation, a shear support is arranged at the bottom of the operation platform 6 and can improve the bearing capacity of the operation platform 6, so that the safety of operation is greatly improved; in order to ensure the strength of the support, the support columns 4 are supported by short steel pipes, the specific length is mainly measured values on site, the support columns 4 and the spandrel girders 3 are fixed by welding, in order to ensure the support effect, the support columns 4 are provided with a plurality of support columns, one of the steel pipe piles 2 is selected after the whole structure is erected, the support columns 4 positioned above are cut off, a method of cutting off at intervals is adopted during cutting off, so that the box girders 1 are prevented from tilting due to stress concentration after cutting off, the spandrel girders 3 are lifted and the steel pipe piles 2 positioned below are cut off, the cut thickness is cut off according to the actual requirements on site, the spandrel girders 3 are then lowered, the steel pipe piles 2 are carefully and prevented from colliding when the spandrel girders 3 are lifted and cut off, the steel pipe piles 2 are damaged and caused to be reworked, the bottom of the spandrel girders 3 are ensured to be flush when the spandrel girders 3 and the steel plates are fixed, the problem of the bottom of the spandrel girders 3 is avoided, the bottom of the spandrel girders are firmly compacted, the problem of the unloading box girders 3 is avoided, the problem of the unloading box girders are firmly connected to the unloading box girders are prevented from being firmly deformed, and the deformation is avoided, the bottom box girders are firmly connected, and the loading box girders are required to be firmly deformed, and the loading box girders are deformed.
Referring to fig. 2 and 4, further, a plurality of the steel pipe piles 2 are oppositely arranged, a distribution beam 5 is arranged between two oppositely arranged steel pipe piles 2, and the distribution beam 5 is positioned between the spandrel girder 3 and the steel pipe piles 2; cutting off the distribution beam 5 between the steel pipe pile 2 to be unloaded and the other steel pipe pile 2 before the support column 4 is cut off; after lifting the spandrel girder 3, the cut distribution girder 5 is cut off from the top of the steel pipe pile 2 to be unloaded. Preferably, when the i-steel of 140a is used as the distribution beam 5 in the field construction, the distribution beam 5 is generally separated at the center of the distribution beam 5, that is, in the middle of two oppositely arranged steel pipe piles 2, so as to avoid the subsequent difficult removal caused by excessive single-side stress.
Further, before the support columns 4 are cut off, reinforcement is performed on the support columns 4 at the top of the remaining steel pipe piles 2. By reinforcing the support columns 4, deflection of the box girder 1 located above is avoided.
Further, after the steel pipe pile 2 is cut, a stiffening rib is dared to be connected to the side portion of the cut steel pipe pile 2. And the elevation of the top of the stiffening rib is flush with the elevation of the top of the cut steel pipe pile 2.
Further, the spandrel girder 3 is lifted or lowered by a chain block. And lifting or lowering the 2H500 multiplied by 200 spandrel girder 3 by adopting 4 groups of 20t chain blocks synchronously.
Further, after the support column 4 is cut off, the elevation change of the box girder 1 is monitored in the whole process.
Further, the length of the fixing column 8 is adapted to the distance between the load flask 7 and the box girder 1.
Further, the thickness of the steel pipe pile 2 to be cut is determined according to the actual construction condition on site.
Further, the load flask 7 is provided at the center of the spandrel girder 3.
The following describes the use process of the unloading construction method.
An operation platform 6 is arranged on two adjacent steel pipe piles 2, the height of the operation platform 6 is lower than the height of the steel pipe piles 2 after being cut, constructors can conveniently construct the steel pipe piles 2 and cut the distribution beams 5 through the operation platform 6, and in order to ensure the safety during construction operation, a shear support is arranged at the bottom of the operation platform 6 and can improve the bearing capacity of the operation platform 6, so that the safety of operation is greatly improved; in order to ensure the strength of the support, the support columns 4 are supported by short steel pipes, the specific length is mainly measured values on site, the support columns 4 and the spandrel girders 3 are fixed by welding, in order to ensure the support effect, the support columns 4 are provided with a plurality of support columns, one of the steel pipe piles 2 is selected after the whole structure is erected, the support columns 4 positioned above are cut off, a method of cutting off at intervals is adopted during cutting off, so that the box girders 1 are prevented from tilting due to stress concentration after cutting off, the spandrel girders 3 are lifted and the steel pipe piles 2 positioned below are cut off, the cut thickness is cut off according to the actual requirements on site, the spandrel girders 3 are then lowered, the steel pipe piles 2 are carefully and prevented from colliding when the spandrel girders 3 are lifted and cut off, the steel pipe piles 2 are damaged and caused to be reworked, the bottom of the spandrel girders 3 are ensured to be flush when the spandrel girders 3 and the steel plates are fixed, the problem of the bottom of the spandrel girders 3 is avoided, the bottom of the spandrel girders are firmly compacted, the problem of the unloading box girders 3 is avoided, the problem of the unloading box girders are firmly connected to the unloading box girders are prevented from being firmly deformed, and the deformation is avoided, the bottom box girders are firmly connected, and the loading box girders are required to be firmly deformed, and the loading box girders are deformed.
The present invention has been described in detail with reference to the embodiments of the drawings, and those skilled in the art can make various modifications to the invention based on the above description. Accordingly, certain details of the illustrated embodiments are not to be taken as limiting the invention, which is defined by the appended claims.
Claims (9)
1. An unloading construction method is constructed at the bottom of a box girder, a plurality of steel pipe piles are arranged below the box girder, a spandrel girder is arranged at the top of the steel pipe piles, and a support column for supporting the box girder is arranged at the top of the spandrel girder, and is characterized by comprising the following steps:
selecting the steel pipe pile to be unloaded, and removing the support column at the top of the steel pipe pile to be unloaded;
lifting the spandrel girder;
cutting off part of the steel pipe pile to be unloaded, and welding a steel plate on the top of the cut steel pipe pile;
lowering the spandrel girder so that the spandrel girder is arranged at the top of the steel plate, and welding and fixing the spandrel girder and the steel plate;
constructing a load sand box at the top of the spandrel girder, and arranging a fixed column between the load sand box and the girder;
repeating the steps until the construction of a plurality of steel pipe piles is completed.
2. The unloading construction method according to claim 1, characterized in that: the steel pipe piles are oppositely arranged, a distribution beam is arranged between the two oppositely arranged steel pipe piles, and the distribution beam is positioned between the spandrel girder and the steel pipe piles;
cutting off a distribution beam between the steel pipe pile to be unloaded and another steel pipe pile before the support column is cut off;
and after lifting the spandrel girder, cutting off the cut distribution girder at the top of the steel pipe pile to be unloaded.
3. The unloading construction method according to claim 1, characterized in that: and before the support columns are cut off, reinforcing the support columns at the tops of the rest of the steel pipe piles.
4. The unloading construction method according to claim 1, characterized in that: and after the steel pipe pile is cut off, the side part of the cut steel pipe pile is dared to be connected with a stiffening rib.
5. The unloading construction method according to claim 1, characterized in that: and lifting or lowering the spandrel girder through the chain block.
6. The unloading construction method according to claim 1, characterized in that: and after the support columns are cut off, monitoring the elevation change of the box girder in the whole process.
7. The unloading construction method according to claim 1, characterized in that: the length of the fixed column is matched with the distance between the load sand box and the box girder.
8. The unloading construction method according to claim 1, characterized in that: and the cutting thickness of the steel pipe pile is determined according to the actual construction condition on site.
9. The unloading construction method according to claim 1, characterized in that: the load sand box is arranged in the center of the spandrel girder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311327268.1A CN117306404A (en) | 2023-10-13 | 2023-10-13 | Unloading construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311327268.1A CN117306404A (en) | 2023-10-13 | 2023-10-13 | Unloading construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117306404A true CN117306404A (en) | 2023-12-29 |
Family
ID=89255058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311327268.1A Pending CN117306404A (en) | 2023-10-13 | 2023-10-13 | Unloading construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117306404A (en) |
-
2023
- 2023-10-13 CN CN202311327268.1A patent/CN117306404A/en active Pending
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