CN112064509A - Construction method for positioning and installing curved steel tower - Google Patents
Construction method for positioning and installing curved steel tower Download PDFInfo
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- CN112064509A CN112064509A CN202010921114.5A CN202010921114A CN112064509A CN 112064509 A CN112064509 A CN 112064509A CN 202010921114 A CN202010921114 A CN 202010921114A CN 112064509 A CN112064509 A CN 112064509A
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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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 discloses a construction method for positioning and installing a curved steel tower, which comprises the following steps: pre-assembling and matching each section of the steel tower; hoisting by a floating crane, performing coarse positioning and superposition by an intersegment positioning mechanism, and temporarily locking by bolts; the method comprises the steps of scanning node data of installation segments, constructing an installation information model, comparing a real-time steel tower installation information model with a design information model to obtain an installation deviation value, and adjusting the positions among the segments according to the installation deviation value to realize accurate positioning; and after the steel tower is completely positioned, welding the joint of the segment to complete the installation and fixation of the segment. The rough positioning during hoisting is fixed, then the component information model is scanned, so that the installation information model is compared with the design information model to obtain the installation deviation value, the position of the segment is accurately adjusted, and finally the segment connecting port of the accurate positioning is welded and fixed, so that the positioning and installation of the curved steel tower are realized, and the construction accuracy and reliability are ensured.
Description
Technical Field
The invention relates to the technical field of bridge installation, in particular to a construction method for positioning and installing a curved steel tower.
Background
Along with the rapid development of social economy in China, the scale and the number of bridge projects are increased sharply, bridges are important links of traffic engineering and are important components in foundation construction, when some suspension bridge main towers across rivers and the like are constructed, curved steel towers are required to be hoisted and installed frequently, the curved steel towers are complex in structure, high in manufacturing and installation difficulty and high in construction precision requirement, and the curved structure installation precision is difficult to guarantee frequently during construction, so that a construction method for positioning and installing the curved steel towers is provided for solving the problems.
Disclosure of Invention
The invention aims to provide a construction method for positioning and installing a curved steel tower, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a construction method for positioning and installing a curved steel tower comprises the following steps:
s1, preassembly matching
Manufacturing the steel tower in a factory in sections, pre-assembling and matching each section, and performing preliminary acceptance;
s2, mounting of steel tower
The method comprises the following steps that each segment of the steel tower is split and transported to a bridge site installation point, the steel tower is hoisted through a floating crane, the steel tower segments are slowly lifted to an installation position, coarse positioning and superposition are carried out through an inter-segment positioning mechanism, and temporary locking is carried out through bolts;
s3, measuring and positioning
After a section of section is roughly positioned and installed on the left tower body and the right tower body of the steel tower, scanning node data of the installation section through three-dimensional laser scanning equipment, constructing an installation information model, comparing the real-time steel tower installation information model with a design information model to obtain an installation deviation value, and adjusting the position between the sections according to the installation deviation value to realize accurate positioning;
s4, welding and fixing
After the steel tower is completely positioned, welding and welding the interfaces at the splicing positions of the steel tower segments through the hanging assembly type hanging baskets to finish the installation and fixation of the segments;
s5, integral processing
And repeating the steps S2-S5 until all the steel tower sections are installed, and horizontally arranging active cross braces at the positions of every two sections in the installation process to limit the steel tower, so that the steel tower is prevented from inclining inwards, and the steel tower is favorable for folding.
In a preferred embodiment, in step S1, before preassembly, the matching members and the locking mounting holes of the positioning mechanism are mounted between the steel tower segments, the steel tower segments are horizontally preassembled on the horizontal support, the ground or the table top, the positioning mechanism is matched, and the steel tower segments are locked by the bolts, so that preassembly and acceptance of the steel tower are realized.
Preferably, the positioning mechanism comprises a mounting groove, the mounting grooves are formed in the top and the bottom of the steel tower segment, the upper matching piece and the lower matching piece are welded in the mounting grooves in the top and the bottom of the steel tower segment respectively, the positioning groove is formed in the top of the upper matching piece, and the positioning block is integrally formed in the bottom of the lower matching piece.
In an embodiment, the positioning block and the positioning groove are of a square platform structure with a large upper part and a small lower part, the positioning groove is in clearance fit with the positioning block, and a plurality of mounting holes are formed in the steel tower segment outside the mounting groove.
In an embodiment, in step S3, a curved inner wall of the steel tower segment is provided with a plurality of inner measurement points, a curved outer wall of the steel tower segment is provided with a plurality of outer measurement points, the three-dimensional laser scanning device scans the shape of the segment to obtain point cloud data of the measurement points, converts the point cloud data into an installation information model, compares the installation information model with a design information model to obtain an installation deviation value, and constructs a design building information model by using the design data, so that the installation position information of the segment can be visually displayed, thereby further providing visual position data monitoring and management, facilitating accurate adjustment of the segment position, and realizing accurate positioning.
In an embodiment, the installation deviation value includes a segment inside deviation value and an outside deviation value, the installation information model and the design information model between the inner measurement points corresponding to the steel tower segments are deviated, and the outside deviation value is the installation information model and the design information model between the outer measurement points.
Preferably, 4 pieces of 10t chain blocks are additionally arranged between the outer walls of the top and the bottom of the adjacent sections after the steel tower sections are coarsely positioned to serve as temporary traction devices, so that the chain blocks can be conveniently pulled oppositely according to installation deviation after measurement and positioning, the plane position of the section to be fixed is adjusted, and accurate positioning is guaranteed.
In a preferred embodiment, in step S4, the steel tower segment is welded by using an assembled hanging basket as a welding platform, the hanging basket is hoisted to a position 1.4 meters below a connection port to be welded by using a floating crane, the hanging basket and the steel tower can be temporarily fixed by using a flange and a cable rope, and an operator performs welding operation by going down into the hanging basket through a ladder outside the steel tower.
Compared with the prior art, the invention has the beneficial effects that: the steel tower is divided into segments which are integrally assembled in a factory according to a designed linear type, the joints of the segments are matched, the linear type and the matching precision of the steel tower are controlled from the source, the control of the hoisting precision of a main tower is facilitated, the segments are temporarily fixed by primarily positioning the segments during the hoisting and installation of the steel tower segments through an installed positioning mechanism, then the appearance of the segments is scanned through three-dimensional laser scanning equipment to obtain point cloud data of measuring points, the point cloud data is converted into an installation information model, the installation information model is compared with the design information model to obtain an installation deviation value, the position information of the segment installation can be visually displayed, visual position data monitoring management can be further provided, the position of the segments is accurately adjusted, the accurate positioning is realized, and finally, the segment connectors which are accurately positioned are welded and fixed, so that the positioning and installation of the curved steel tower are realized, the construction accuracy and reliability are ensured.
Drawings
FIG. 1 is a schematic overall view of a steel tower according to the present invention;
FIG. 2 is a schematic structural view of a steel tower segment according to the present invention.
In the figure: 1. mounting grooves; 2. an upper matching piece; 3. a lower matching member; 4. positioning a groove; 5. positioning blocks; 6. an outer measurement point; 7. inner measurement points.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a construction method for positioning and installing a curved steel tower comprises the following steps:
s1, preassembly matching
Manufacturing the steel tower in a factory in sections, pre-assembling and matching each section, and performing preliminary acceptance;
s2, mounting of steel tower
The method comprises the following steps that each segment of the steel tower is split and transported to a bridge site installation point, the steel tower is hoisted through a floating crane, the steel tower segments are slowly lifted to an installation position, coarse positioning and superposition are carried out through an inter-segment positioning mechanism, and temporary locking is carried out through bolts;
s3, measuring and positioning
After a section of section is roughly positioned and installed on the left tower body and the right tower body of the steel tower, scanning node data of the installation section through three-dimensional laser scanning equipment, constructing an installation information model, comparing the real-time steel tower installation information model with a design information model to obtain an installation deviation value, and adjusting the position between the sections according to the installation deviation value to realize accurate positioning;
s4, welding and fixing
After the steel tower is completely positioned, welding and welding the interfaces at the splicing positions of the steel tower segments through the hanging assembly type hanging baskets to finish the installation and fixation of the segments;
s5, integral processing
And repeating the steps S2-S5 until all the steel tower sections are installed, and horizontally arranging active cross braces at the positions of every two sections in the installation process to limit the steel tower, so that the steel tower is prevented from inclining inwards, and the steel tower is favorable for folding.
In step S1, before preassembly, the matching pieces and the locking mounting holes of the positioning mechanisms are mounted among the steel tower segments, the steel tower segments are horizontally preassembled on a horizontal support, the ground or a table top, the positioning mechanisms are matched and locked through bolts, preassembly acceptance of the steel tower is achieved, and the steel tower can meet design requirements after being assembled through preassembly matching.
Positioning mechanism includes mounting groove 1, mounting groove 1 has all been opened to the good bottom in top of steel tower segment section, matching piece 2 and lower matching piece 3 are welded respectively in the mounting groove 1 of steel tower segment section top and bottom, it has constant head tank 4 to go up the top of matching piece 2, the bottom integrated into one piece of lower matching piece 3 is equipped with locating piece 5, locating piece 5 is big-end-up's square platform structure with constant head tank 4, and constant head tank 4 and 5 clearance fit of locating piece, it has a plurality of mounting holes to open on the steel tower segment section in the 1 outside of mounting groove, then carry out thick location stack through 5 joint constant head tank 4 of locating piece during the installation of steel tower segment section, be convenient for follow-up measuring and obtain the installation deviation, thereby.
The curved inner wall of steel tower segment is equipped with a plurality of interior measuring point 7, the curved outer wall of steel tower segment is equipped with a plurality of outer measuring point 6, three-dimensional laser scanning equipment scans the appearance of segment and obtains measuring point cloud data, and turn into installation information model with point cloud data, compare installation information model and design information model and obtain the installation deviation value, design building information ization model utilizes design data to establish and forms, the positional information of the installation of display segment that can be very audio-visual, thereby can further provide visual positional data control management, the accurate adjustment segment position of being convenient for, realize the accurate positioning.
The installation deviation value comprises an inner deviation value and an outer deviation value of the segment, the installation information model and the design information model between the inner measuring points 7 corresponding to the steel tower segment are deviated, and the outer deviation value is the installation information model and the design information model between the outer measuring points 6.
The real-time data model during installation of the component steel tower is compared and analyzed with the design model, so that the installation position of the positioning segment can be accurately controlled, and the curved shape of the steel tower after installation is ensured.
After the steel tower segment is roughly positioned, 4 pieces of 10t chain blocks are additionally arranged between the top and the bottom outer wall of the adjacent segment to serve as temporary traction devices, the chain blocks are conveniently pulled oppositely according to installation deviation after measurement and positioning, the plane position of the segment to be fixed is adjusted, and accurate positioning is guaranteed.
In the step S4, the steel tower segment is welded and the assembled hanging basket is used as a welding platform, the hanging basket is hoisted to a position 1.4 meters below a connector needing to be welded through a floating crane, the hanging basket and the steel tower can be temporarily fixed through a flange and a cable rope, and an operator performs welding operation in the hanging basket through a ladder on the outer side of the steel tower.
In conclusion, the steel tower is divided into the sections to be integrally assembled in a factory according to the designed linear type, the joints of the sections are matched, the linear type and the matching precision of the steel tower are controlled from the source, the control of the hoisting precision of the main tower is facilitated, the sections are temporarily fixed conveniently by performing primary positioning on the sections of the steel tower during hoisting and installation through the installed positioning mechanism, then the appearance of the sections is scanned through three-dimensional laser scanning equipment to obtain point cloud data of measuring points, the point cloud data is converted into an installation information model, the installation information model is compared with the design information model to obtain installation deviation values, the position information of the section installation can be visually displayed, and therefore visual position data monitoring management can be further provided, the position of the sections is accurately adjusted, the accurate positioning is realized, and finally the accurately positioned sections are welded and fixed, so that the positioning and installation of the connecting port of the curved steel tower is realized, the construction accuracy and reliability are ensured.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A construction method for positioning and installing a curved steel tower is characterized by comprising the following steps:
s1, preassembly matching
Manufacturing the steel tower in a factory in sections, pre-assembling and matching each section, and performing preliminary acceptance;
s2, mounting of steel tower
The method comprises the following steps that each segment of the steel tower is split and transported to a bridge site installation point, the steel tower is hoisted through a floating crane, the steel tower segments are slowly lifted to an installation position, coarse positioning and superposition are carried out through an inter-segment positioning mechanism, and temporary locking is carried out through bolts;
s3, measuring and positioning
After a section of section is roughly positioned and installed on the left tower body and the right tower body of the steel tower, scanning node data of the installation section through three-dimensional laser scanning equipment, constructing an installation information model, comparing the real-time steel tower installation information model with a design information model to obtain an installation deviation value, and adjusting the position between the sections according to the installation deviation value to realize accurate positioning;
s4, welding and fixing
After the steel tower is completely positioned, welding and welding the interfaces at the splicing positions of the steel tower segments through the hanging assembly type hanging baskets to finish the installation and fixation of the segments;
s5, integral processing
And repeating the steps S2-S5 until all the steel tower sections are installed, and horizontally arranging active cross braces at the positions of every two sections in the installation process to limit the steel tower, so that the steel tower is prevented from inclining inwards, and the steel tower is favorable for folding.
2. The construction method for positioning and installing the curved steel tower according to claim 1, wherein the construction method comprises the following steps: in step S1, before preassembly, the matching pieces and the mounting holes for locking of the positioning mechanisms are mounted among the steel tower segments, the steel tower segments are horizontally preassembled on a horizontal support, the ground or a table top, the positioning mechanisms are matched, and the steel tower segments are locked through bolts, so that preassembly and acceptance of the steel tower are realized.
3. The construction method for positioning and installing the curved steel tower according to claim 2, wherein the construction method comprises the following steps: positioning mechanism includes mounting groove (1), mounting groove (1) have all been opened to the good bottom in top of steel tower segment section, matching piece (2) and lower matching piece (3) are gone up in the mounting groove (1) of steel tower segment section top and bottom welding respectively, open at the top of going up matching piece (2) has constant head tank (4), the bottom integrated into one piece of matching piece (3) is equipped with locating piece (5) down.
4. The construction method for positioning and installing the curved steel tower according to claim 3, wherein the construction method comprises the following steps: locating piece (5) and constant head tank (4) are big-end-up's square platform structure, and constant head tank (4) and locating piece (5) clearance fit, it has a plurality of mounting holes to open on the steel tower segment section in mounting groove (1) outside.
5. The construction method for positioning and installing the curved steel tower according to claim 1, wherein the construction method comprises the following steps: in the step S3, a plurality of inner measuring points (7) are arranged on the curved inner wall of the steel tower segment, a plurality of outer measuring points (6) are arranged on the curved outer wall of the steel tower segment, the three-dimensional laser scanning equipment scans the shape of the segment to obtain point cloud data of the measuring points, the point cloud data is converted into an installation information model, the installation information model is compared with a design information model to obtain an installation deviation value, the design building information model is constructed by using the design data, and the installation position information of the segment can be visually displayed, so that visual position data monitoring and management can be further provided, the position of the segment can be accurately adjusted, and accurate positioning can be realized.
6. The construction method for positioning and installing the curved steel tower according to claim 5, wherein the construction method comprises the following steps: the installation deviation value comprises an inner deviation value and an outer deviation value of the segment, the installation information model and the design information model between the inner measuring points (7) corresponding to the steel tower segment are deviated, and the outer deviation value is the installation information model and the design information model between the outer measuring points (6).
7. The construction method for positioning and installing the curved steel tower according to claim 1, wherein the construction method comprises the following steps: after the steel tower sections are roughly positioned, 4 sets of 10t chain blocks are additionally arranged between the top and bottom outer walls of adjacent sections to serve as temporary traction devices, so that the chain blocks can be conveniently pulled oppositely according to installation deviation after measurement and positioning, the plane positions of the sections to be fixed are adjusted, and accurate positioning is guaranteed.
8. The construction method for positioning and installing the curved steel tower according to claim 1, wherein the construction method comprises the following steps: in the step S4, the steel tower segment is welded and the assembled hanging basket is used as a welding platform, the hanging basket is hoisted to a position 1.4 meters below a connector needing to be welded through a floating crane, the hanging basket and the steel tower can be temporarily fixed through a flange and a cable rope, and an operator performs welding operation in the hanging basket through a ladder on the outer side of the steel tower.
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| CN109290739A (en) * | 2018-08-15 | 2019-02-01 | 中铁宝桥集团有限公司 | A kind of space curve head tower segment manufacturing process |
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2020
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Patent Citations (8)
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| CN104389268A (en) * | 2014-11-14 | 2015-03-04 | 中铁大桥局集团第二工程有限公司 | Steel tower column with positioning structure and hoisting construction method thereof |
| CN104695333A (en) * | 2014-11-27 | 2015-06-10 | 中铁四局集团第五工程有限公司 | Construction method of curved-surface arc-shaped main towers of cross-river single-cable suspension bridge |
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