CN115030041A - Construction method for improving mounting and positioning precision of steel box girder - Google Patents
Construction method for improving mounting and positioning precision of steel box girder Download PDFInfo
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- CN115030041A CN115030041A CN202210656448.3A CN202210656448A CN115030041A CN 115030041 A CN115030041 A CN 115030041A CN 202210656448 A CN202210656448 A CN 202210656448A CN 115030041 A CN115030041 A CN 115030041A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 171
- 239000010959 steel Substances 0.000 title claims abstract description 171
- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000009434 installation Methods 0.000 claims abstract description 15
- 238000000691 measurement method Methods 0.000 claims abstract description 6
- 238000007689 inspection Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention relates to the technical field of bridge construction, in particular to a construction method for improving the mounting and positioning accuracy of a steel box girder. Firstly, selecting a field which does not influence the operation of the crawler crane by adopting a bracket grading installation method, arranging steel box girder brackets for hoisting steel box girders in a group of two-by-two mode, and then fixing a distribution girder above the steel box girder brackets; hoisting the steel box girder to the distribution girder by adopting a double-crawler crane hoisting manner, and then measuring and finely adjusting the position of the steel box girder by adopting a six-point positioning measurement method; after the steel box girder is installed and positioned, the crawler crane is withdrawn and a next section of steel box girder bracket is ready to be installed; and repeating the steps to finish the hoisting of the steel box girder, and finally, hoisting the rest steel box girder by using a temporary access as a hoisting site, wherein the temporary access is a non-construction area outside the preset area of the steel box girder support. The method can greatly improve the working efficiency and positioning precision of the installation and positioning of the steel box girder and ensure the stability of the whole construction process.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a construction method for improving the mounting and positioning accuracy of a steel box girder.
Background
In the construction process of a large-scale steel bridge girder, a temporary support is usually erected in a construction area of the steel bridge to serve as a temporary support system of the steel box girder; after all temporary support systems are erected, a steel box girder is installed at the top of a support by a single-machine hoisting method through a large-tonnage crawler crane, a distribution girder is welded at the top of the support, a steel pipe hard support for supporting the steel box girder is welded on the distribution girder, the contact part of the steel pipe hard support and the steel box girder is processed by adopting a flame cutting method, the x, y and z values of the space coordinates of the four corner datum points of the wing plate at the top of the steel box girder are measured by utilizing a six-point positioning measurement method, and the total 12 measured values are measured, and the steel box girder is adjusted to the coordinate value required by design according to the actual measured value by utilizing auxiliary tools such as the crawler crane, a jack, a chain block and the like, so that the positioning of the steel box girder is realized. However, the engineering construction site is limited, the steel box girder on site is not placed in a proper place, the moving range and the occupied place of the crawler crane and the rotating radius of a crane lifting arm rod are limited by the positions among the steel box girder supports, so that the steel box girder cannot accurately reach the installation position required by the design during hoisting, a steel pipe hard support welded at the top of the distribution girder is not in complete contact with the steel box girder, the technical requirement on a crawler crane driver is high, the operation difficulty in the hoisting process is high, the positioning precision of the steel box girder is low, the space coordinate of each reference point is difficult to be adjusted to the standard allowable range value by one large-tonnage crawler crane in the fine adjustment process, and the influence on the cross-connection of high-strength bolts and the pouring of a bridge deck system in the later period is large. Therefore, a construction method for improving the mounting and positioning accuracy of the steel box girder is researched under the condition.
Disclosure of Invention
The invention provides a construction method for improving the mounting and positioning accuracy of a steel box girder to solve the technical problems in the prior art, so as to improve the working efficiency and the positioning accuracy and ensure the stability of the whole construction process.
In order to achieve the purpose, the invention adopts the following technical scheme:
a construction method for improving the mounting and positioning accuracy of a steel box girder comprises the following steps:
s1, selecting places which do not affect the operation of the crawler crane by adopting a bracket grading installation method, forming a group of steel box girder brackets horizontally installed for hoisting steel box girders in pairs, and keeping a certain distance L between every two adjacent groups of steel box girder brackets; then fixing a horizontal distribution beam above the two steel box beam supports with the distance L, wherein the distribution beam is vertical to the steel box beam supports below the distribution beam; two groups of positioning plates are welded on the distribution beam, the distance between the two groups of positioning plates is greater than the width of the steel box beam, the number of the positioning plates is two, and the outer side of each positioning plate is reinforced by an inclined strut;
s2, hoisting the steel box girder to the distribution girder by adopting a double-crawler crane lifting and hanging mode, and then measuring and finely adjusting the position of the steel box girder by adopting a six-point positioning measurement method, specifically: selecting end datum points at two ends of the central axis of the steel box girder, measuring the x value and the y value of the space coordinate of the end datum points through a measuring instrument, and adjusting the values to be matched with the corresponding coordinates in the design drawing; two sides of the top of the steel box girder are provided with two steel box girder top wing plates along the length direction, and two diaphragm plate top plates are arranged between the two top wing plates along the width direction of the steel box girder; selecting an angle reference point at each of two ends of each top wing plate, and adjusting the angle reference points to be matched with corresponding coordinates in a design drawing by measuring and adjusting the z value of the spatial coordinates of the four angle reference points, wherein the spatial coordinates are referenced by a national geodetic coordinate system;
s3, after the steel box girder is installed and positioned, the crawler crane is withdrawn and ready for installing the next section of steel box girder bracket; and repeating the steps to finish the hoisting of the steel box girder, and finally, hoisting the rest steel box girder by using a temporary access as a hoisting site, wherein the temporary access is a non-construction area outside the preset area of the steel box girder support.
As a preferable technical scheme, the difference between the distance between the two groups of positioning plates in the S1 and the width of the steel box girder is 15 mm.
As a preferred technical scheme, the positions of the positioning plates can be obtained by measurement, the position of one positioning plate at the outermost side is measured firstly, and the positions of other groups of positioning plates are calculated according to the width M of the steel box girder and the distance N between two adjacent sections of steel box girders: assuming that the position of one positioning plate at the outermost side is O, the position of one positioning plate matched with the positioning plate is O + M +15mm, and the positions of one group of positioning plates adjacent to the positioning plate are O + M + N and O + M + N + M +15mm respectively.
In a preferable technical scheme, in S2, steel pipe hard supports are arranged at four corners of the top of the distribution beam; specifically, four mounting points are designed in advance at the top of the distribution beam, namely two steel pipe hard supports are fixed to the mounting points in a group, and two ends of each section of the steel box beam are respectively provided with one group of steel pipe hard supports.
According to the preferable technical scheme, the upper end notch of the steel pipe hard support is processed into a section matched with the radian of the bottom plate of the steel box girder.
As a preferred technical scheme, in the process of measuring and fine-tuning the position of the steel box girder in S2, fine-tuning the two ends of the steel box girder by a double-crawler crane double-machine step-by-step adjustment method: one end of the steel box girder is adjusted by using one crawler crane, and the other end of the steel box girder is adjusted after the adjustment is finished until the steel box girder reaches the installation position.
As a preferred technical solution, the end reference point in S2 can be determined by any one of the following two methods:
A) making diagonal lines in a rectangular cross section area at each end of the steel box girder, temporarily setting a diagonal line intersection point as an end reference point, checking whether a central point of the rectangular cross section area is superposed with the diagonal line intersection point by using a measuring ruler, and if the central point is superposed with the diagonal line intersection point, connecting two end reference points at two ends of the steel box girder as a central axis of the steel box girder;
B) adopting the observation position that is higher than the diaphragm roof, making the diagonal in the rectangle region at the diaphragm roof top of every one end of steel box girder, the crossing point of diagonal tentatively is the end datum point, and reuse dipperstick inspection this rectangle regional central point whether with the coincidence of the crossing point of diagonal, if the coincidence, the crossing point of diagonal is confirmed to be the end datum point.
The invention has the advantages and positive effects that:
compared with the prior art, the construction method for improving the mounting and positioning accuracy of the steel box girder has the following advantages:
(1) the construction method for improving the mounting and positioning accuracy of the steel box girder improves the mounting and positioning method of the transmission bridge, improves the working efficiency and the positioning accuracy, and ensures the stability of the whole construction process. The support grading installation method is adopted, so that the problems that a hoisting field is limited and a crawler crane hoisting arm is difficult to rotate are solved, the reasonable utilization of the construction field is realized, the risk in the hoisting process is reduced, and the smooth proceeding of the project is ensured;
(2) the hoisting adjusting range is reduced by the limiting and positioning action of the positioning plate, and the trouble caused by large-amplitude adjustment in the later period is avoided;
(3) the method for lifting by using the double-crawler crane reduces the difficulty in the lifting and adjusting process, reduces the destructiveness to a lifting field in the construction process, and improves the safety of the whole lifting process;
(4) by utilizing a six-point positioning measurement method, the x and y values of end datum points at two ends of the steel box girder and the z values of four top corner datum points are measured, 12 measured values are reduced to 8, the measured value of each section of the steel box girder is reduced, the control of the points by the two crawler cranes is easier to master during positioning adjustment, the mutual influence degree of each datum point during measurement is smaller, the measured data is more accurate, the time is saved, and the efficiency is improved.
(5) The method of cutting by using the cutting saw instead of flame is adopted, the hard support inclined cut of the steel pipe obtained by cutting is smooth and is matched with the radian of the bottom plate of the steel box girder, the stability of the installation process is improved, and the installation precision is improved.
Description of the drawings:
FIG. 1 is a schematic view of a hierarchical installation method of a rack according to an embodiment of the present invention;
FIG. 2 is a front view of a steel box girder support according to an embodiment of the present invention;
FIG. 3 is a side view of a steel box girder support according to an embodiment of the present invention;
FIG. 4 is a front view of a steel box girder according to an embodiment of the present invention;
fig. 5 is a top view of a steel box girder according to an embodiment of the present invention.
Description of the reference numerals:
1-steel box girder support; 2-presetting an area of the steel box girder bracket; 21-temporary access; 3-steel box girder; 31-steel box girder I; 32-steel box girder II; 33-steel box girder III; (ii) a 4, crawler crane; 5-concrete buttress; 6-steel pipe hard support; 7-a distribution beam; 8, positioning a plate; 9-inclined strut; 101-end fiducial points; 102-an angular reference point; 11-diaphragm top plate; 12-wing plate; 13-rectangular cross-sectional area.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the present invention; rather than all embodiments. Based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
As shown in fig. 1-5, the invention provides a construction method for improving the mounting and positioning accuracy of a steel box girder, which comprises the following steps:
1) adopting a bracket grading installation method, horizontally installing steel box girder brackets 1 for hoisting steel box girders 3 in pairs, wherein a certain distance L is arranged between every two adjacent groups of steel box girder brackets 1; the steel box girder support preset area 2 influencing the entrance and exit construction position of the crawler crane 4 and the circling operation of the boom rod of the crawler crane is not provided with the steel box girder support firstly;
then fixing a horizontal distribution beam 7 above the two steel box beam supports 1 with the distance L, wherein the distribution beam 7 is vertical to the steel box beam supports 1 below the distribution beam 7; four mounting points of steel pipe hard supports 6 are designed in advance at four corners of the top of the distribution beam 7, namely the steel pipe hard supports 6 are two in one group, and two ends of each section of the steel box girder 3 respectively adopt one group of steel pipe hard supports 6; the mounting points are determined for ensuring that the steel pipe hard supports 6 are completely contacted with the bottom plate of the steel box girder, and the steel pipe hard supports 6 are required to be welded on the corresponding mounting points during mounting; preferably, the upper end notch of the steel pipe hard support 6 needs to be processed into a section matched with the radian of the bottom plate of the steel box girder;
preferably, as shown in fig. 2 and 3, two groups of positioning plates 8 are further welded on the distribution beam 7, the two positioning plates 8 are one group and are located on the outer side of the steel pipe hard support 6, the distance between the two groups of positioning plates 8 is greater than the width of the steel box girder 3, and the difference between the distance and the width of the steel box girder is 15 mm. The outer side of each positioning plate 8 is reinforced by an inclined strut 9.
The position of the positioning plate 8 can be obtained according to measurement, and the specific operation is as follows: the position of one locating plate at the outermost side is measured, and the positions of other groups of locating plates are calculated according to the width M of the steel box girder 3 and the distance N between two adjacent sections of steel box girders 3, for example: the position of the outermost positioning plate is O, the position of the positioning plate matched with the outermost positioning plate is O + M +15mm, and the positions of the group of positioning plates adjacent to the outermost positioning plate are O + M + N and (O + M + N) + M +15mm respectively.
2) The steel box girder 3 is hoisted to the upper ends of four steel pipe hard supports 6 by adopting a double-crawler crane hoisting mode, and then the position of the steel box girder 3 is measured and finely adjusted by adopting a six-point positioning measurement method, specifically: selecting end datum points 101 at two ends of the central axis of the steel box girder, measuring the x value and the y value of the space coordinate of the end datum points 101 through a measuring instrument, and adjusting the values to be matched with the corresponding coordinates in the design drawing; as is known, two steel box girder top wing plates 12 are arranged on two sides of the top of the steel box girder 3 along the length direction, and two diaphragm plate top plates 11 are arranged between the two top wing plates 12 along the width direction of the steel box girder 3; the invention selects an angle reference point 102 at two ends of each top wing plate 12, and adjusts the Z value of the space coordinate of the four angle reference points 102 to be matched with the corresponding coordinate in the design drawing by measuring and adjusting the Z value, wherein the space coordinate is referred to a 2000 national geodetic coordinate system.
After the steel box girder 3 is installed and positioned, the crawler crane 4 is withdrawn and is ready for installing the next section of steel box girder bracket; and repeating the steps to finish the hoisting of the steel box girder, and finally, hoisting the rest steel box girder by using the temporary access 21 as a hoisting site, wherein the temporary access 21 is a non-construction area outside the preset area 2 of the steel box girder support.
Preferably, in the measuring and fine-tuning process in the step 2), fine-tuning is performed on two ends of the steel box girder by adopting a double-crawler crane double-machine step-by-step adjusting method: one end of the steel box girder is adjusted by using one crawler crane, and the other end of the steel box girder is adjusted after the adjustment is finished until the steel box girder reaches the installation position.
Preferably, the end reference point 101 in step 2) can be determined by any one of the following two methods:
A) as shown in fig. 4, a rectangular cross-sectional area 13 at each end of the steel box girder 3 is made into a diagonal line, the intersection point of the diagonal line is tentatively set as an end reference point 101, a measuring ruler is used for detecting whether the central point of the rectangular cross-sectional area 13 is coincided with the intersection point of the diagonal line, and if the central point is coincided with the intersection point of the diagonal line, a connecting line of the two end reference points 101 at the two ends of the steel box girder 3 is used as the central axis of the steel box girder;
B) as shown in fig. 5, the observation position higher than the diaphragm plate top plate 11 is adopted, a diagonal line is made in the rectangular area at the top of the diaphragm plate top plate at each end of the steel box girder 3, the intersection point of the diagonal line is tentatively set as an end reference point 101, a measuring ruler is used for detecting whether the central point of the rectangular area coincides with the intersection point of the diagonal line, and if the central point coincides with the intersection point of the diagonal line, the intersection point of the diagonal line is determined as the end reference point 101.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (7)
1. A construction method for improving the mounting and positioning accuracy of a steel box girder is characterized by comprising the following steps:
s1, selecting a place which does not affect the operation of the crawler crane by adopting a bracket grading installation method, forming a group of steel box girder brackets horizontally installed for hoisting steel box girders two by two, and spacing a certain distance L between two adjacent groups of steel box girder brackets; then fixing a horizontal distribution beam above the two steel box beam supports with the distance L, wherein the distribution beam is vertical to the steel box beam supports below the distribution beam; two groups of positioning plates are welded on the distribution beam, the distance between the two groups of positioning plates is greater than the width of the steel box beam, the number of the positioning plates is two, and the outer side of each positioning plate is reinforced by an inclined strut;
s2, hoisting the steel box girder to the distribution girder by adopting a double-crawler crane lifting and hanging mode, and then measuring and finely adjusting the position of the steel box girder by adopting a six-point positioning measurement method, specifically: selecting an end reference point at each of two ends of the central axis of the steel box girder, measuring the x value and the y value of the spatial coordinate of the end reference point through a measuring instrument, and adjusting the values to be matched with the corresponding coordinate in the design drawing; two sides of the top of the steel box girder are provided with two steel box girder top wing plates along the length direction, and two diaphragm plate top plates are arranged between the two top wing plates along the width direction of the steel box girder; selecting an angle reference point at each of two ends of each top wing plate, and adjusting the angle reference points to be matched with corresponding coordinates in a design drawing by measuring and adjusting the z value of the spatial coordinates of the four angle reference points, wherein the spatial coordinates are referenced by a national geodetic coordinate system;
s3, after the steel box girder is installed and positioned, the crawler crane is withdrawn and ready for installing the next section of steel box girder bracket; and repeating the steps to finish the hoisting of the steel box girder, and finally, hoisting the rest steel box girder by using a temporary access as a hoisting site, wherein the temporary access is a non-construction area outside the preset area of the steel box girder support.
2. The construction method for improving the mounting and positioning accuracy of the steel box girder according to claim 1, wherein the difference between the distance between the two sets of positioning plates in the step S1 and the width of the steel box girder is 15 mm.
3. The construction method for improving the installation and positioning accuracy of the steel box girder according to claim 2, wherein the positioning plates are measured, the position of the outermost positioning plate is measured, and the positions of the other groups of positioning plates are calculated according to the width M of the steel box girder and the distance N between two adjacent sections of the steel box girder: and if the position of the outermost positioning plate is O, the position of the positioning plate matched with the outermost positioning plate is O + M +15mm, and the positions of the group of positioning plates adjacent to the outermost positioning plate are O + M + N and O + M + N + M +15mm respectively.
4. The construction method for improving the mounting and positioning accuracy of the steel box girder according to claim 1, wherein in S2, steel pipe hard supports are arranged at four corners of the top of the distribution girder; specifically, four mounting points are designed in advance at the top of the distribution beam, namely two steel pipe hard supports are fixed to the mounting points in a group, and two ends of each section of the steel box beam are respectively provided with one group of steel pipe hard supports.
5. The construction method for improving the installation and positioning accuracy of the steel box girder according to claim 4, wherein the upper end notch of the steel pipe hard support is processed into a section matched with the radian of the bottom plate of the steel box girder.
6. The construction method for improving the mounting and positioning accuracy of the steel box girder according to claim 1, wherein in the process of measuring and fine-tuning the position of the steel box girder in S2, fine-tuning both ends of the steel box girder is performed by adopting a method of double-crawler crane and double-machine step-by-step adjustment: one end of the steel box girder is adjusted by using one crawler crane, and the other end of the steel box girder is adjusted after the adjustment is finished until the steel box girder reaches the installation position.
7. The construction method for improving the installation and positioning accuracy of the steel box girder according to claim 1, wherein the end reference point in S2 can be determined by any one of the following two methods:
A) making diagonal lines in a rectangular cross section area at each end of the steel box girder, temporarily setting a diagonal line intersection point as an end reference point, checking whether a central point of the rectangular cross section area is superposed with the diagonal line intersection point by using a measuring ruler, and if the central point is superposed with the diagonal line intersection point, connecting two end reference points at two ends of the steel box girder as a central axis of the steel box girder;
B) adopting the observation position that is higher than the diaphragm roof, making the diagonal in the rectangle region at the diaphragm roof top of every one end of steel box girder, the crossing point of diagonal tentatively is the end datum point, and reuse dipperstick inspection this rectangle regional central point whether with the coincidence of the crossing point of diagonal, if the coincidence, the crossing point of diagonal is confirmed to be the end datum point.
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| CN202210656448.3A CN115030041A (en) | 2022-06-10 | 2022-06-10 | Construction method for improving mounting and positioning precision of steel box girder |
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| CN202210656448.3A CN115030041A (en) | 2022-06-10 | 2022-06-10 | Construction method for improving mounting and positioning precision of steel box girder |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210621471U (en) * | 2019-04-30 | 2020-05-26 | 湖北辉创重型工程有限公司 | Positioning device for mounting steel box girder |
| CN112609581A (en) * | 2020-12-08 | 2021-04-06 | 上海市机械施工集团有限公司 | Construction method of large-span steel box girder |
| CN112921827A (en) * | 2021-04-25 | 2021-06-08 | 中国电建市政建设集团有限公司 | Construction method for hoisting large-span steel bridge box girder and hoisting and installing special-shaped component |
| DE102020119716A1 (en) * | 2020-03-23 | 2021-09-23 | China Railway Seventh Group Co. Ltd. | Method and apparatus for lifting an advanced box girder bridge to prevent excessive downward slope |
| CN114263114A (en) * | 2021-12-21 | 2022-04-01 | 安徽省公路桥梁工程有限公司 | Construction system and construction method of large-section steel box girder |
-
2022
- 2022-06-10 CN CN202210656448.3A patent/CN115030041A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210621471U (en) * | 2019-04-30 | 2020-05-26 | 湖北辉创重型工程有限公司 | Positioning device for mounting steel box girder |
| DE102020119716A1 (en) * | 2020-03-23 | 2021-09-23 | China Railway Seventh Group Co. Ltd. | Method and apparatus for lifting an advanced box girder bridge to prevent excessive downward slope |
| CN112609581A (en) * | 2020-12-08 | 2021-04-06 | 上海市机械施工集团有限公司 | Construction method of large-span steel box girder |
| CN112921827A (en) * | 2021-04-25 | 2021-06-08 | 中国电建市政建设集团有限公司 | Construction method for hoisting large-span steel bridge box girder and hoisting and installing special-shaped component |
| CN114263114A (en) * | 2021-12-21 | 2022-04-01 | 安徽省公路桥梁工程有限公司 | Construction system and construction method of large-section steel box girder |
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