CN109914261B - Double-rib four-truss basket type steel truss arch closure construction method - Google Patents
Double-rib four-truss basket type steel truss arch closure construction method Download PDFInfo
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Abstract
The invention relates to a double-rib four-truss basket type steel truss arch closure construction method, which comprises the following steps: after the standard sections of the steel truss arch are hoisted, calculating the cable force of the last two buckled anchor cables, tensioning the buckled anchor cables of the standard section rod pieces at the two ends of the closure opening, measuring the line shape and the elevation of the closure opening, reaching the predicted coordinate, stopping tensioning the buckled anchor cables, and setting one section as a free end; carrying out three-dimensional measurement on the length of the closure opening, and determining the optimal closure time period and closure temperature; hoisting a closure member bar by using a cable crane for closure, wherein the closure member bar is symmetrically installed in the sequence of upper and lower members and inner and outer members; the installation of the rod pieces is completed by using the hand chain block, the crowbar and the mechanical jack, one end of each rod piece is firstly locked, the other end of each rod piece waits for the most suitable temperature or the alignment of an auxiliary tool, the positioning is firstly carried out by using a punching nail, then the locking of the high bolt is screwed, and the closure is completed. The invention is suitable for the steel truss arch closure construction of the non-parallel truss arch ring with double ribs, multiple trusses and an angle.
Description
Technical Field
The invention relates to a double-rib four-truss basket type steel truss arch closure construction method, and belongs to the field of arch bridge construction.
Background
Along with the continuous improvement of bridge construction technology, mountain land large-span bridges are gradually increased, steel truss bridges are gradually matured, but an attack stage still exists in the erection of the large-span double-rib multi-truss basket type steel truss arch bridge. The existing steel truss arch closure method is that hole sites at two ends of a closure are basically aligned with hole sites of splicing plates through adjustment of a fastening anchor cable, hole washing is carried out, and a high-strength bolt penetrates through the hole washing, so that the structure safety and the service life are influenced. Only non-angle parallel steel truss arch folding technology exists at present.
Chinese patent CN 108978491 a proposes a method for closing a full-bolting truss arch bridge, in which the closing sections are integrated, and the size of the closing opening is adjusted by using the last group of buckle anchor cables during closing. However, the method cannot meet the requirement of single-rod closure of the double-rib four-truss basket type steel truss arch. The single-rod piece closure has many closure rods, many closure points and a three-dimensional inner inclination angle, and once a certain rod piece completes closure, other closure rod pieces can not be installed according to a conventional mode.
Disclosure of Invention
The invention aims to solve the technical problem of providing a double-rib four-truss basket type steel truss arch closure construction method which is suitable for double-rib multi-truss non-parallel truss arch ring steel truss arch closure construction with angles.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a double-rib four-truss basket type steel truss arch closure construction method comprises the following steps:
(1) after the standard sections of the steel truss arch are hoisted, calculating the cable force of the last two buckled anchor cables, tensioning the buckled anchor cables of the standard section rod pieces at the two ends of the closure opening, measuring the line shape and the elevation of the closure opening, reaching the predicted coordinate, stopping tensioning the buckled anchor cables, and setting one section as a free end;
(2) carrying out three-dimensional measurement on the length of the closure opening, and determining the optimal closure time period and closure temperature;
(3) hoisting a closure member bar by using a cable crane for closure, wherein the closure member bar is symmetrically installed in the sequence of upper and lower members and inner and outer members; the installation of the rod pieces is completed by using the hand chain block, the crowbar and the mechanical jack, one end of each rod piece is firstly locked, the other end of each rod piece waits for the most suitable temperature or the alignment of an auxiliary tool, the positioning is firstly carried out by using a punching nail, then the locking of the high bolt is screwed, and the closure is completed.
Compared with the prior art, the invention adopting the technical scheme has the beneficial effects that:
the hoisting sequence is carefully arranged: firstly hoisting the web members, the inner upper chords and the outer upper chords and the upper parallel connection, and then hoisting the inner lower chords and the outer lower chords; firstly, installing the innermost member bar and then installing the member bars outwards in sequence, namely constructing the arch ring formed by the plurality of trusses; symmetrically installing; the normal and orderly closure of the multi-rod pieces of the double-rib four-truss basket type steel truss arch is ensured, and the construction period is saved; the linear shape of the steel truss arch is ensured, the problem that the arch axis is unevenly stressed and deviates to one side is prevented, and closure construction can be smoothly completed.
Preferably, the further technical scheme of the invention is as follows:
the method for determining the optimal closure time period and closure temperature in the step (2) comprises the following steps: the closure opening is continuously measured every 1 hour for 4 days, and the change rule of temperature change, the size of the closure opening, elevation and an axis is measured.
The closure section member bars in the step (3) comprise 16 box-type member bars which are 2 inner side diagonal web members, 2 inner side upper chord members, 2 outer side diagonal web members, 2 outer side upper chord members, 2 upper flat joints, 2 inner side lower chord members, 2 outer side lower chord members and 2 lower flat joints; the closure sequence is as follows: and 2 inner side oblique web members, 2 inner side upper chords, 2 outer side oblique web members, 2 outer side upper chords, 2 upper parallel ties, 2 inner side lower chords, 2 outer side lower chords and 2 lower parallel ties are sequentially installed to complete closure.
The hoisting method of the closure section rod piece comprises the following steps:
(1) hoisting 2 inner side diagonal web members by a cable crane to close the opening, performing angle adjustment by using a chain block, lowering 2 inner side diagonal web members by the cable crane, aligning the upper ends of the inner side diagonal web members by using punching nails, positioning the upper ends of the inner side diagonal web members by using the chain block and a mechanical jack, aligning the lower ends of the inner side diagonal web members by using the punching nails;
(2) when the temperature of 2 inner side upper chords of the cable crane is reduced to be close to the closure temperature, the 2 inner side upper chords are started to be lowered, a splice plate at one end of a rod piece is fixed by utilizing a chain block to finely adjust the position and the angle of the rod piece, the free end waits for the temperature to reach the closure temperature, when a large temporary locking pin shaft is inserted, punching nails are carried out on 4-surface high-strength bolt holes for positioning, after all bolts are penetrated, the 4-surface splice plates are simultaneously locked, and meanwhile, the 2 inner side diagonal web members are locked;
(3) according to the method of the steps (1) and (2), closing 2 outer side diagonal web members and 2 outer side upper chords;
(4) hoisting 2 upper parallel links, utilizing a chain block to adjust the length of a hoisting point, inserting one end into the closure position, and adjusting the hoisting point to insert the non-inserted end into the closure position;
(5) installing 2 inner side lower chords, lifting the inner side lower chords to a folding position by using a cable crane, finely adjusting the angle of a rod piece by using a chain block and a mechanical jack to meet a design angle, fixing one end of the rod piece, waiting for the temperature of the free end of the rod piece, punching and positioning 4 bolt holes when a large temporary locking pin shaft is inserted, and simultaneously locking 4 splicing plates after high-strength bolts completely penetrate;
(6) and (5) installing 2 outer side lower chords and 2 lower parallel ties according to the method in the step (5).
Drawings
FIG. 1 is a schematic diagram of a full bridge structure and a schematic diagram of a closure segment of an embodiment of the invention;
FIG. 2 is a top view of the closure segment;
FIG. 3 is a bottom view of the closure segment;
FIG. 4 is a cross-sectional view of the closure section (embodying the basket arch angle);
in the figure: 1. the free end is locked; 2. the locking end is locked; 3. an upper chord; 4. a diagonal web member; 5. a lower chord; 6. a left outboard upper chord; 7. a left inner top chord; 8. the left side is connected in parallel; 9. the right side is provided with a parallel connection 2; 10. a right inside top chord; 11. a right lateral upper chord; 12. a left outboard lower chord; 13. a left inside lower chord; 14. the left side is connected in parallel; 15. the right side is connected in parallel; 16. a right inside lower chord; 17. right lateral lower chord.
Detailed Description
The invention is further described with reference to the following figures and examples.
With reference to fig. 1-4, a double-rib four-truss basket-type steel truss arch closure construction method comprises the following steps:
(1) before closure, two sections of standard knots at the closure opening are hoisted, and the cable force of the anchoring cable is obtained through calculation; tensioning the fastening anchor cable to reach the estimated coordinates and the designed axis position of the closure opening.
(2) After the stretching is stable, continuously measuring the closure opening for 4 days for 24 hours at intervals of 1 hour for 1 time, collating the measured data, analyzing the data to obtain the change rule of the temperature and the closure opening, and determining the optimal temperature, the optimal time and the closure section operation time period of the closure.
(3) The closure process comprises the following steps:
A. the cable crane is used for hoisting the inner oblique web member and the right inner oblique web member to a folding position, adjusting the chain block to enable the angle of the oblique web member to accord with a design angle, aligning the upper end of the oblique web member, positioning the oblique web member by using a punching nail, aligning the lower end of the oblique web member by matching the cable crane, the chain block and a mechanical jack, and positioning the oblique web member and the right inner oblique web member by using the punching nail.
B. The cable crane is used for hoisting the left inner side upper chord 7 and the right inner side upper chord 10 to the closing position, the cable crane is firstly used for lowering the cable crane, and then the chain block is used for finely adjusting the positions and the angles of the inner side upper chord 7 and the right inner side upper chord 10. Firstly fixing one end, when the other end waits for the determined temperature to reach the closure temperature, punching and positioning the 4 bolt holes, penetrating high-strength bolts, and simultaneously locking the 4 faces after the high-strength bolts are completely penetrated. At the same time, the inner diagonal web members 1, 2 are locked.
C. And (4) installing the left outer diagonal web member, the right outer diagonal web member, the left outer upper chord 6 and the right outer upper chord 11 and repeating the step A, B.
D. The upper left parallel connection 8 is installed, the length of the lifting appliance is adjusted by using a chain block to form an angle, and one end of the lifting appliance is inserted into the closure opening. Then the chain block is adjusted to enable the other end of the chain block to descend to reach the insertion position, and the chain block is additionally arranged in the horizontal direction to pull the non-insertion end into the closure opening.
E. The process of installing the upper right parallel connection 9 is the same as the step D.
F. Installing a left inner side lower chord 13 and a right inner side lower chord 16, lifting the left inner side lower chord to a closure opening by using a cable crane, slowly lifting, drawing the corner by using a chain block, jacking the bottom of a mechanical jack to enable the angle of the jack to be consistent with the design angle, fixing one end of the jack, punching and positioning 4 bolt holes when the other end of the jack waits for the temperature to reach the closure temperature, threading high-strength bolts, and locking 4 faces simultaneously after the high-strength bolts are completely threaded.
G. And F, installing the outer left side lower chord 12, the right side outer side lower chord 17, the left side lower parallel connection 14 and the right side lower parallel connection 15 to finish closure.
The above is only a specific implementation flow of the present invention, but the protection of the present invention is not limited thereto, and any changes or substitutions equivalent to the technical features of the present invention that can be made by those skilled in the art are included in the protection scope of the present invention.
Claims (2)
1. A double-rib four-truss basket type steel truss arch closure construction method is characterized by comprising the following steps:
(1) after the standard sections of the steel truss arch are hoisted, calculating the cable force of the last two buckled anchor cables, tensioning the buckled anchor cables of the standard section rod pieces at the two ends of the closure opening, measuring the line shape and the elevation of the closure opening, reaching the predicted coordinate, stopping tensioning the buckled anchor cables, and setting one section as a free end;
(2) carrying out three-dimensional measurement on the length of the closure opening, and determining the optimal closure time period and closure temperature; the method comprises the following steps: measuring the closure opening for 4 days continuously every 1 hour, and measuring the change rule of temperature, the size of the closure opening, elevation and axis;
(3) hoisting closure section members by using a cable crane for closure, wherein the closure section members comprise 16 box-shaped members in total, 2 inner side diagonal web members, 2 inner side upper chords, 2 outer side diagonal web members, 2 outer side upper chords, 2 upper parallel ties, 2 inner side lower chords, 2 outer side lower chords and 2 lower parallel ties; the installation of the rod pieces is completed by using the hand chain block, the crowbar and the mechanical jack, one end of each rod piece is firstly locked, the other end of each rod piece waits for the most suitable temperature or the alignment of an auxiliary tool, the positioning is firstly carried out by using a punching nail, and then the high bolt is screwed for locking; the installation sequence of the closure section rod pieces is up and down firstly, inside and outside firstly, and symmetrically installed, and the closure sequence is as follows: and 2 inner side oblique web members, 2 inner side upper chords, 2 outer side oblique web members, 2 outer side upper chords, 2 upper parallel ties, 2 inner side lower chords, 2 outer side lower chords and 2 lower parallel ties are sequentially installed to complete closure.
2. The double-rib four-truss basket type steel truss arch closure construction method according to claim 1, characterized in that: the hoisting method of the closure section rod piece comprises the following steps:
(1) hoisting 2 inner side diagonal web members by a cable crane to close the opening, performing angle adjustment by using a chain block, lowering 2 inner side diagonal web members by the cable crane, aligning the upper ends of the inner side diagonal web members by using punching nails, positioning the upper ends of the inner side diagonal web members by using the chain block and a mechanical jack, aligning the lower ends of the inner side diagonal web members by using the punching nails;
(2) when the temperature of 2 inner side upper chords of the cable crane is reduced to be close to the closure temperature, the 2 inner side upper chords are started to be lowered, a splice plate at one end of a rod piece is fixed by utilizing a chain block to finely adjust the position and the angle of the rod piece, the free end waits for the temperature to reach the closure temperature, when a large temporary locking pin shaft is inserted, punching nails are carried out on 4-surface high-strength bolt holes for positioning, after all bolts are penetrated, the 4-surface splice plates are simultaneously locked, and meanwhile, the 2 inner side diagonal web members are locked;
(3) according to the method of the steps (1) and (2), closing 2 outer side diagonal web members and 2 outer side upper chords;
(4) hoisting 2 upper parallel links, utilizing a chain block to adjust the length of a hoisting point, inserting one end into the closure position, and adjusting the hoisting point to insert the non-inserted end into the closure position;
(5) installing 2 inner side lower chords, lifting the inner side lower chords to a folding position by using a cable crane, finely adjusting the angle of a rod piece by using a chain block and a mechanical jack to meet a design angle, fixing one end of the rod piece, waiting for the temperature of the free end of the rod piece, punching and positioning 4 bolt holes when a large temporary locking pin shaft is inserted, and simultaneously locking 4 splicing plates after high-strength bolts completely penetrate;
(6) and (5) installing 2 outer side lower chords and 2 lower parallel ties according to the method in the step (5).
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| CN113931067A (en) * | 2020-07-13 | 2022-01-14 | 中铁宝桥集团有限公司 | Space multidimensional angle control method for inward-inclined basket arch bridge |
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| KR101372290B1 (en) * | 2012-05-11 | 2014-03-11 | 주식회사 장헌산업 | Construction Method of Arch Rib in Arch Bridge |
| CN102912736B (en) * | 2012-11-07 | 2015-03-04 | 中铁六局集团有限公司 | Vertical assembling construction method for trussed arch bridge |
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