CN114673088A - Construction method applied to spatial main cable suspension bridge catwalk - Google Patents
Construction method applied to spatial main cable suspension bridge catwalk Download PDFInfo
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- CN114673088A CN114673088A CN202210216721.0A CN202210216721A CN114673088A CN 114673088 A CN114673088 A CN 114673088A CN 202210216721 A CN202210216721 A CN 202210216721A CN 114673088 A CN114673088 A CN 114673088A
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
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Abstract
The invention provides a construction method applied to a spatial main cable suspension bridge catwalk, and relates to the technical field of bridge engineering. The invention includes the installation construction method of the catwalk and the installation construction method of the wind-resistant system, wherein the construction method of the catwalk includes the integral construction method of the catwalk and the separate construction method of the catwalk, compared with the traditional suspension bridge, the invention has the advantages that the spacing value of the main cable is a non-constant value, and the installation construction method of the invention can realize that the catwalk is changed from an integral type to a separated type so as to adapt to the construction requirements of the construction of the main cable of the suspension bridge and the installation of the steel box girder segment; meanwhile, the installation method of the wind resisting system can well realize that the matching of the wind resisting system and the catwalk of the suspension bridge is met when the catwalk of the suspension bridge is of an integral structure, can effectively solve the problem of wind resisting stability of the integral catwalk of the main cable suspension bridge in a space under a complex wind field environment, and enhances the longitudinal and transverse rigidity of the integral catwalk.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a construction method applied to a spatial main cable suspension bridge catwalk.
Background
The catwalk is a linear temporary construction sidewalk which is erected below the main cable and is parallel to the main cable during construction of the suspension bridge. The high-altitude scaffold is a high-altitude scaffold for construction operation of constructors, and is a construction platform for a main cable system and even the whole upper structure of a suspension bridge. The construction personnel complete important tasks such as rope strand traction, cable adjustment, shaping and saddle entering, cable tightening, cable clamp and sling installation, box girder hoisting and construction site connection, main cable winding, protective coating and the like. One for each of the upstream and downstream, the cross section is generally U-shaped, long and narrow with some wobble, so called catwalk. The bridge is an extremely important temporary facility in the construction of the suspension bridge, and the bridge is dismantled after completion. And two main cables of traditional suspension bridge are parallel arrangement generally, therefore the catwalk interval that is used for traditional suspension bridge is the disconnect-type structure of fixed value, and the suspension bridge that becomes interval formation ellipse arrangement is applied to main cable at present, and traditional fixed disconnect-type catwalk can't be applicable to this type of suspension bridge. And a certain number of transverse channels are arranged between the fixed and separated catwalk structures of the traditional suspension bridge to increase the wind resistance of the catwalk during construction, so that the wind resistance structure is not suitable for the catwalk structure with variable distance.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a construction method applied to a catwalk of a spatial main cable suspension bridge, which is used for solving the problems in the background art.
In order to achieve the above objects and other related objects, the present invention provides a construction method for a catwalk of a main cable suspension bridge, including a method for installing the catwalk and a method for installing a wind-resistant system;
the installation construction method of the catwalk comprises an integral construction method of the catwalk and a separation construction method of the catwalk, the two catwalks are of an integral structure in the integral construction process of the catwalk, the integral catwalk is separated into the two independent catwalks through the separation construction method of the catwalk, and the integral construction method of the catwalk comprises the following steps:
s11, transporting the anchoring blocks to the tower top to be connected with the pre-embedded climbing cones to finish pre-installation, then anchoring the anchoring blocks on the tower top by using finish rolling deformed steel bars, and connecting the anchoring beams with the large pull rods and the small pull rods after the assembly is finished;
s12, pre-erecting a pilot cable, towing the pilot cable by a ship to cross the sea
The shore is connected with a first guide rope,
the bank and the K bank are respectively opposite banks of the suspension bridge, and the first guide rope drives the second guide rope to be erected on 
Between the bank and the K bank, the second guide rope drives the third guide rope to erect
Between the bank and the K bank, the cable diameters of the guide cable, the first guide cable, the second guide cable and the third guide cable are sequentially increased;
s13, drawing the carrier bearing rope through a third guide rope
The bank is pulled to the K bank and anchored on the top of the K bank; after the bracket bearing rope is erected, a bracket positioning rope is erected and connected with a third guide rope, the bracket is hung on the bracket bearing rope, connecting points are arranged on the bracket positioning rope at intervals in the length direction, and each bracket is correspondingly connected with each connecting point;
s14, erecting a catwalk bearing rope, wherein the catwalk bearing rope passes through a drawing device of a third guide rope
The bank is pulled to the K bank, two ends of the catwalk bearing cable are connected with the small pull rod, the catwalk bearing cable is sequentially erected according to the sequence that the left and right widths are symmetrical and the two sides are symmetrical in a spanning mode, and the erecting sequence is adjusted according to the deviation condition of the main towers at the two banks in the erecting process; a position-changing steel frame is arranged at the front end position where the catwalk bearing rope is connected with the small pull rod to adjust the distance between the catwalk bearing ropes;
s15, drawing a portal frame bearing rope;
s16, paving a catwalk surface net on the catwalk bearing rope;
s17, installing a catwalk handrail and a catwalk portal to complete installation of the whole catwalk;
The catwalk is installed with the wind-resistant system under the integral condition, and the installation and construction method of the wind-resistant system comprises the following steps:
s21, erecting a wind-resistant cable, and dragging the wind-resistant cable to a bracket by using a cable strand traction system;
s22, connecting the catwalk and the wind-resistant cable by using a wind-resistant suspender;
s23, the wind-resistant cable is pulled to the position near the anchoring device by utilizing the tower top winch matched with the steering device,
s24, connecting an anchor head of the wind-resistant cable to a second pull rod of an anchoring device through the cooperation of a tower crane, then tensioning the wind-resistant cable in the anchoring device through a jack, and installing an anchoring steel belt to complete the fixation of the wind-resistant cable after the tensioning is completed;
the separation construction method of the catwalk comprises the steps of firstly drawing the main cable strand, then installing the pushing system, and pushing the catwalk from the middle to the two sides through the pushing system to form a separated catwalk structure.
Optionally, in S12, a pilot cable is pre-installed on the K bank
Erecting a first guide rope in advance on the bank, and drawing one end of the guide rope to
The bank is connected with the first guide rope, and then the first guide rope is driven by the winch to be pulled to the K bank; pre-erecting a second guide rope on the K bank, connecting the second guide rope with the first guide rope, and driving the first guide rope by a winch to pull the second guide rope to the K bank 
A shore; in that
And pre-erecting a third guide rope on the bank, connecting the third guide rope with the second guide rope, and driving the second guide rope through a winch to pull the third guide rope to the K bank to finish the traction.
Alternatively, in S13, the carriers are uniformly arranged at intervals of 100 m, and the carrier positioning cord is passed through the third guide cord
Pulling the carrier to K shore, one of the carrier and the carrier when the carrier positioning rope is pulled out for every 100 mThe positioning ropes are connected and sequentially pulled to the top of the K bank tower until the positioning ropes of the bracket are pulled.
Optionally, in S11, the whole assembly of the anchor beam, the large pull rod and the small pull rod is lifted to the tower top by using a tower crane and connected with the anchor block through a steel pin, and meanwhile, the two ends of the anchor beam are lifted on a gantry of the tower top by using a steel rope and a chain block, and the angle of inclination of the catwalk is adjusted by using the chain block.
Optionally, the catwalk bearing rope is subjected to sag adjustment in a triangular elevation measurement mode, sag of midspan bearing ropes of a single bearing rope is measured in sequence, the midspan sag adjustment is adjusted by tensioning small pull rods at two ends of the catwalk bearing rope, and two ends of the catwalk bearing rope at the same midspan are symmetrically tensioned at the same time until the corresponding sag positions are adjusted; the side-span catwalk bearing rope is adjusted through a small tension rod at the top of the tensioning tower.
Optionally, catwalk veil is laid and is adopted the method of sliding to lay, the tower crane is with veil handling to tower top platform, the manual work is carried the veil to on the catwalk bearing rope, later carry out the ligature of anti-skidding stuff and the installation of big or small square steel, the midspan is with the top of the tower steelframe that shifts to the top of the tower section earlier with plank and veil laid, simultaneously with this section both sides set up the guard rail, the side span will adjust pull rod to the top of the tower section earlier with plank and veil laid, also set up the guard rail with this section both sides, set up the counter weight at catwalk veil front end when the midspan veil gliding, utilize top of the tower hoist control the transfer of catwalk surface course, when catwalk veil can not freely transfer, utilize traction system to pull the cat walk veil and transfer.
Optionally, utilize bolt fixed mounting catwalk railing after the completion is laid to the catwalk surface course, catwalk railing interval arrangement is on the catwalk, and handrail rope and railing rope are installed on the catwalk railing through the mode of drawing, later utilize the ligature area to fix railing net and catwalk bearing rope, railing rope, handrail rope, catwalk railing.
Optionally, the mounting step of installing the catwalk portal comprises the following steps: (1) on the K bank and
assembling catwalk portal frames on tower top approach bridges on two banks; (2) hoisting catwalk portal frame to tower The top door frame is connected with the door frame rope through a U-shaped bolt, the front end of the catwalk door frame is connected with a traction steel rope, and the rear end of the catwalk door frame is connected with a tower top winch reverse-pulling steel rope; (3) firstly, a first catwalk portal is drawn to a midspan position, and the catwalk portal is connected with a lower crossbeam through a steel pin; (4) and sequentially mounting the rest catwalk portal to span to the tops of the two banks and the positions from the tops to the anchors.
Optionally, the wind-resistant hanging pieces at each position select a fixed steel rope with a corresponding length cut from the steel rope reel by using the cutting piece according to the initial installation position condition, and after the wind-resistant hanging pieces are installed, the linear shape of the wind-resistant rope is controlled by adjusting the length of the adjusting chain on the wind-resistant hanging pieces.
Optionally, the anchoring devices are mounted at both ends of the bridge tower bearing platform, and the steering devices are mounted on the bridge tower bearing platform between the two anchoring devices and the position where the tower top winch is projected on the bridge tower bearing platform.
As described above, the construction method applied to the catwalk of the spatial main cable suspension bridge of the invention at least has the following beneficial effects:
the invention provides a construction method for a catwalk of a spatial main cable suspension bridge, which comprises an installation construction method of the catwalk and an installation construction method of a wind-resistant system, wherein the construction method of the catwalk comprises an integral construction method of the catwalk and a separation construction method of the catwalk; meanwhile, the installation method of the wind resisting system can well realize that the matching of the wind resisting system and the catwalk of the suspension bridge is met when the catwalk of the suspension bridge is of an integral structure, can effectively solve the problem of wind resisting stability of the integral catwalk of the main cable suspension bridge in a space under a complex wind field environment, and enhances the longitudinal and transverse rigidity of the integral catwalk.
Drawings
FIG. 1 is a schematic view of the first guide cable being driven by the guide cable according to the present invention;
FIG. 2 is a schematic view showing the engagement of the anchoring beam and the anchoring block according to the present invention;
fig. 3 shows a schematic arrangement of the anchoring device and the steering device according to the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure of the present invention.
Please refer to fig. 1 to 3. It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions of the present disclosure, so that the present disclosure is not limited to the technical essence, and any modifications of the structures, changes of the ratios, or adjustments of the sizes, can still fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms may be changed or adjusted without substantial change in the technical content.
The following examples are for illustrative purposes only. The various embodiments may be combined, and are not limited to what is presented in the following single embodiment.
Referring to fig. 1 and 2, the invention provides a construction method applied to a catwalk of a spatial main cable suspension bridge, which includes a catwalk installation construction method and a wind resistance system installation construction method; the installation construction method of the catwalk comprises an integral construction method of the catwalk and a separation construction method of the catwalk, the two catwalks are of an integral structure in the integral construction process of the catwalk, the integral catwalk is separated into the two independent catwalks through the separation construction method of the catwalk, and the integral construction method of the catwalk comprises the following steps:
s11, transporting the anchoring blocks to the tower top to be connected with the pre-embedded climbing cones to finish pre-installation, then anchoring the anchoring blocks on the tower top by using finish rolling deformed steel bars, and connecting the anchoring beams with the large pull rods and the small pull rods after the assembly is finished;
s12, pre-erecting a pilot cable, towing the pilot cable by a ship to cross the sea
The shore is connected with a first guide rope,
the bank and the K bank are opposite banks of the suspension bridge respectively, and the first guide rope drives the second guide rope to be erected on the suspension bridge
Between the bank and the K bank, the second guide rope drives the third guide rope to be erected on 
Between the bank and the K bank, the cable diameters of the pilot cable 4-1, the first guide cable 4-2, the second guide cable and the third guide cable are sequentially increased;
s13, drawing the bracket bearing rope through a third traction rope
The bank is pulled to the K bank and anchored on the top of the K bank; after the bracket bearing rope is erected, a bracket positioning rope is erected and connected with a third guide rope, the bracket is hung on the bracket bearing rope, connecting points are arranged on the bracket positioning rope at intervals in the length direction, and each bracket is correspondingly connected with each connecting point;
s14, erecting a catwalk bearing rope, wherein the catwalk bearing rope passes through a drawing device of a third guide rope
The bank is pulled to the K bank, two ends of the catwalk bearing cable are connected with the small pull rod, the catwalk bearing cable is sequentially erected according to the sequence that the left and right widths are symmetrical and the two sides are symmetrical in a spanning mode, and the erecting sequence is adjusted according to the deviation condition of the main towers at the two banks in the erecting process; front end position of catwalk for connecting load-bearing rope and small pull rodInstalling a deflection steel frame to adjust the distance between the bearing ropes of each catwalk;
s15, drawing a portal frame bearing rope;
s16, paving a catwalk surface net on the catwalk bearing rope;
s17, installing a catwalk handrail and a catwalk portal to complete installation of the whole catwalk;
the catwalk is installed with the wind-resistant system under the integral condition, and the installation and construction method of the wind-resistant system comprises the following steps:
S21, erecting a wind-resistant cable, and dragging the wind-resistant cable to a bracket by using a cable strand traction system;
s22, connecting the catwalk and the wind-resistant cable by using a wind-resistant suspender;
s23, the wind-resistant cable is pulled to the position near the anchoring device by utilizing the tower top winch matched with the steering device,
s24, connecting an anchor head of the wind-resistant cable to a second pull rod of the anchoring device through the cooperation of a tower crane, then tensioning the wind-resistant cable in the anchoring device through a jack, and installing an anchoring steel belt to complete the fixation of the wind-resistant cable after the tensioning is completed;
the separation construction method of the catwalk comprises the steps of firstly drawing the main cable strand, then installing the pushing system, and pushing the catwalk from the middle to the two sides through the pushing system to form a separated catwalk structure.
Because the diameter of the catwalk bearing rope is larger and the weight is heavier, if the construction is very troublesome in direct erection operation, the traction system is formed by sequentially connecting and erecting the guide rope 4-1, the first guide rope 4-2, the second guide rope and the third guide rope with sequentially increased diameters, the construction operation is more convenient, the erection of thick ropes is more facilitated, and the erection mode that the rope diameters are sequentially increased and the small ropes sequentially pull the large ropes can better realize traction for subsequent catwalk bearing ropes and other ropes; in the process of towing for crossing the sea, the catwalk bearing rope is supported by the bracket in the process of towing, the weight of the catwalk bearing rope is transferred to the bracket bearing rope, and the sag and tension of the catwalk bearing rope are reduced; the bracket is positioned at one part through the bracket positioning rope The brackets are connected in sequence in a certain interval distance, so that the distribution and installation of the brackets can be realized more uniformly and effectively. The installation body is arranged on the bridge tower, the end part of the catwalk bearing rope is connected with an anchoring beam 2-1, a large pull rod 2-2 is arranged on the anchoring beam 2-1, one end of the large pull rod 2-2 is provided with a connector, and the connector is connected with a hinged shaft. In the traditional construction process of the suspension bridge, the catwalk bearing rope is directly connected with the top of a cable saddle or a concrete structure after being connected with the small pull rod 2-3, the tensile stress of the bearing rope is very large, and the bearing rope is not stable in a direct fixed-point connection mode for a long time, and the concrete structure on the top of the tower is easy to be pulled to crack to cause serious safety accidents, and the anchoring combined structure in the scheme can be applied to a spatial main cable suspension bridge, the anchoring blocks 3-2 are connected with the tower top, the symmetrical connection mode and the multipoint matching connection mode are adopted, the mode that the bearing rope is connected with the tower top from single-point contact is changed into the connection mode that the bearing rope is transmitted through the middle of the anchoring block 3-2, the risk that the concrete structure at the tower top is directly cracked due to single-point connection with concentrated stress is reduced, the connection is more stable, and the accident risk of construction is reduced. The combination of the anchoring beam 2-1, the large pull rod 2-2 and the small pull rod 2-3 realizes the installation connection of the catwalk bearing rope, namely the adjustment of position parameters such as length and angle, the large pull rod can be rotatably arranged on the anchoring block of the bridge tower to realize the adjustment of the angle of the anchoring block, the large pull rod and the small pull rod can be matched with the anchoring beam in a displacement mode to realize the change of the length distance from the bearing rope to the top of the tower so as to realize the adjustment of the length of the bearing rope, and compared with the prior art, the adjustment of the position change of the catwalk bearing rope can be better realized so as to better realize the position adjustment of the catwalk. In order to adjust the shape of the catwalk conveniently, the catwalk is installed according to the design reference position of the large pull rod and the small pull rod during assembly, the length of the large pull rod on the midspan side is 8700mm, and the length of the small pull rod is 3700 mm; the length of the large pull rod on the side span is 7500mm, and the length of the small pull rod is 3700 mm; the gantry bearing ropes are separated, four gantry bearing ropes are spanned on the K bank, single ropes are coiled with one another, and each gantry bearing rope is 320.4725m in length; four gantry bearing ropes are spanned in the midspan, each length is 1185.6374m, the total length is four cable discs, the K bank is connected with the K bank 
Two disks are arranged on each bank;
four gantry bearing ropes are spanned on the bank, single ropes are wound on the same disc, and each length is 298.288 m. The traction mode of the mid-span and side-span portal bearing rope is the same as that of the catwalk bearing rope, repeated description is omitted, after the anchoring side-span bearing rope at the anchorage is pulled in place, the portal bearing rope is placed in a cable saddle on the anchorage portal, and then the rope head is connected with an embedded part on the anchorage through a heart ring. When the top of the tower is connected, the rope head at the top of the tower is put into a rope saddle on the top of the tower portal, the rope head is connected with a top of the tower hoist, the bearing of the portal is adjusted to the designed verticality through the hoist, and the portal is temporarily anchored on the top of the tower portal by a rope clip. After the mid-span and side-span portal bearing ropes are adjusted to the designed sag and anchored, the mid-span and side-span bearing ropes are connected by using a rope clamp at the tower top; and (4) dismantling the bracket and the bracket positioning rope after the catwalk bearing rope is erected. The midspan bracket is dismantled by winding one end of the rope end of the positioning rope around
On the winch at the top of the tower, the rope head at the other end is released from the anchoring point and is connected with the drawing device. The traction system and the tower top winch are utilized to recover the brackets and the bracket positioning cables one by one
Dismantling the tower top; the invention provides a construction method for a catwalk of a spatial main cable suspension bridge, which comprises an installation construction method of the catwalk and an installation construction method of a wind-resistant system, wherein the construction method of the catwalk comprises an integral construction method of the catwalk and a separation construction method of the catwalk; meanwhile, the installation method of the wind resisting system can well realize that the matching of the wind resisting system and the catwalk of the suspension bridge is met when the catwalk is of an integral structure The problem of wind resistance stability of the integral catwalk of the spatial main cable suspension bridge under a complex wind field environment can be effectively solved, and longitudinal and transverse rigidity of the integral catwalk is enhanced.
In this embodiment, referring to fig. 1, in S12, a guide cable 4-1 is pre-installed on the K bank
A first guide rope 4-2 is pre-arranged on the shore, and one end of the guide rope 4-1 is drawn to
The shore is connected with a first guide rope 4-2, and then the first guide rope 4-2 is driven by a winch to be pulled to the K shore through a guide rope 4-1; pre-erecting a second guide rope on the K bank, connecting the second guide rope with the first guide rope 4-2, and drawing the second guide rope to the first guide rope 4-2 by driving the first guide rope 4-2 through a winch
A shore; in that
And pre-erecting a third guide rope on the bank, connecting the third guide rope with the second guide rope, and driving the second guide rope through a winch to pull the third guide rope to the K bank to finish the traction. The guide cable 4-1 can be selected
The high-strength cable with the specification comprises a first guide rope 4-2, a second guide rope and a third guide rope, wherein steel ropes with the diameters of phi 16, phi 24 and phi 36 can be sequentially selected, and a pilot rope 4-1 can be pulled from a K bank to a K bank through carrying by a ship
The bottom of the bank is connected to a first index 4-2.
In this embodiment, in S13, the brackets are uniformly arranged at intervals of 100 m, and the bracket positioning ropes are passed through the third guide ropes 
Pulling the shore to K shore, and positioning the rope as the bracketWhen the tower is pulled out for 100 meters, one of the brackets is connected with the bracket positioning rope, and the pulling is sequentially carried out until the bracket positioning rope is pulled to the top of the K-bank tower.
In this embodiment, in S11, the whole assembly of the anchor beam, the large pull rod and the small pull rod is lifted to the tower top by using the tower crane, and connected to the anchor block by the steel pin, and meanwhile, the two ends of the anchor beam are lifted to the gantry on the tower top by using the steel rope and the chain block, and the angle of inclination of the catwalk is adjusted by using the chain block.
In the embodiment, the sag of the catwalk bearing rope is adjusted in a triangular elevation measurement mode, the sag of the midspan of a single bearing rope is measured in sequence, the sag of the midspan is adjusted by tensioning small pull rods at two ends of the catwalk bearing rope, and two ends of the catwalk bearing rope at the same midspan are symmetrically tensioned at the same time until the corresponding sag positions are adjusted; the side-span catwalk bearing rope is adjusted through a small tension rod at the top of the tensioning tower. After the catwalk bearing rope is erected and completed, theoretically, the catwalk line shape is a designed line shape, but the actual sag is inconsistent with the designed sag due to temperature, processing errors and installation errors, and therefore the sag of the catwalk bearing rope needs to be finely adjusted. The relative height difference of the sag of the bearing rope of each catwalk is controlled within 3cm, and the absolute height difference is controlled within 5 cm.
In this embodiment, catwalk veil is laid and is adopted the method of sliding to lay, the tower crane is with veil handling to tower top platform, the manual work is carried the veil to on the catwalk bearing rope, later carry out the ligature of anti-skidding stuff and the installation of big or small square steel, the midspan is with the top of the tower steelframe that shifts to the top of the tower section earlier with plank and veil laid, set up protection railing with this section both sides simultaneously, the side span will adjust pull rod to the top of the tower section earlier with plank and veil laid, also set up protection railing with this section both sides, set up the counter weight at catwalk veil front end when midspan veil gliding, utilize top of the tower hoist control transfer of catwalk veil, when catwalk veil can not freely transfer, utilize traction system to pull catwalk veil and transfer. Utilize bolt fixed mounting catwalk railing after completion is laid to the catwalk surface course, catwalk railing interval arrangement is on the catwalk, and handrail rope are installed on the catwalk railing through the mode of pulling, later utilize the ligature area to fix railing net and catwalk bearing rope, handrail rope, catwalk railing.
In this embodiment, the installation step of catwalk portal installation: (1) on the K bank and
assembling catwalk portal frames on tower top approach bridges on two banks of the bank; (2) the catwalk portal frame is lifted to the top of the tower and connected with a portal rope through a U-shaped bolt, the front end of the catwalk portal frame is connected with a traction steel rope, and the rear end of the catwalk portal frame is connected with a top winch reverse-pulling steel rope; (3) firstly, a first catwalk portal frame is pulled to a midspan position, and the catwalk portal frame is connected with a lower cross beam through a steel pin; (4) and sequentially mounting the rest catwalk portal frames to all positions of the top of the two-bank tower and the top of the tower to the anchor.
In this embodiment, the wind-resistant hanging piece at each position selects a fixed steel rope with a corresponding length cut off from the steel rope reel by the cutting piece according to the initial installation position condition, and after the wind-resistant hanging piece is installed, the linear shape of the wind-resistant rope is controlled by adjusting the length of the adjusting chain on the wind-resistant hanging piece. The length of the fixed steel rope in each wind-resistant hanging piece is determined by field blanking, the corresponding length is correspondingly cut from the steel rope reel to form the wind-resistant hanging piece, and the connection length is adjusted by the chain on the wind-resistant hanging piece according to the connection condition after the wind-resistant hanging piece is installed so as to control the line shape of the wind-resistant rope.
In this embodiment, referring to fig. 3, the anchoring devices are installed at both ends of the bridge tower bearing platform, and the steering devices are installed on the bridge tower bearing platform between the two anchoring devices and the position where the tower top hoist is projected on the bridge tower bearing platform. The anchoring device 2 comprises an anchoring part, a first anchor beam, a second anchor beam, a first pull rod and a second pull rod; the anchoring part is fixed on the tower column bearing platform; one end of the first pull rod is matched with the first anchor beam, and the other end of the first pull rod is arranged on the anchoring piece; one end of the second pull rod is matched with the second anchor beam, and the other end of the second pull rod is used for connecting the wind-resistant cable; when the tension of the wind-resistant cable needs to be adjusted after the second pull rod is connected with the wind-resistant cable, an adjusting pull rod is arranged between the first anchor beam and the second anchor beam, two ends of the adjusting pull rod are respectively matched with the first anchor beam and the second anchor beam, a driving piece is arranged on the second anchor beam, and the driving piece can drive the reaction frame to determine the distance between the first anchor beam and the second anchor beam; after tension adjustment of the wind-resistant cable is completed, a plurality of anchoring connecting pieces are arranged between the first anchor beam and the second anchor beam, one ends of the anchoring connecting pieces are fixed on the first anchor beam, and the other ends of the anchoring connecting pieces are fixed on the second anchor beam. The steering device comprises an anchoring block and a single-wheel pulley, the anchoring block and the single-wheel pulley are connected with each other, the anchoring block is fixed on a bridge tower bearing platform, and the traction rope 3-1 is matched with the single-wheel pulley. Because a certain distance exists between the wind-resistant cable and the anchoring device 2, the installation and connection difficulty is high, the traction device drives the traction rope 3-1 to pull the wind-resistant cable to approach the corresponding anchoring device 2, the problem of connection between the wind-resistant cable and the anchoring device 2 is effectively solved, and meanwhile, the tension requirement for realizing effective work of the wind-resistant cable is met; each steering device is arranged on the bridge tower bearing platform between the two anchoring devices and the position projected by the tower top winch on the bridge tower bearing platform, the guiding direction of the traction rope 3-1 can be effectively adjusted to finally realize connection with the wind-resistant rope, meanwhile, the problem that the traction rope 3-1 touches the tower column or other parts to cause structural damage in the transmission process is avoided, and the durability and the safety are better. Optionally, the steering device comprises a first steering device 3-21, a second steering device 3-22 and a third steering device 3-23, the first steering device 3-21 is close to the anchoring device 2, the third steering device 3-23 is on the same vertical line with the traction device at the top of the tower, the second steering device 3-22 is located between the first steering device 3-21 and the third steering device 3-23, and the second steering device 3-22 and the third steering device 3-23 are located on the same cross section of the bridge tower bearing platform.
In conclusion, the invention provides a construction method for a spatial main cable suspension bridge catwalk, which comprises an installation construction method for a catwalk and an installation construction method for a wind-resistant system, wherein the construction method for the catwalk comprises an integral construction method for the catwalk and a separation construction method for the catwalk, compared with the traditional suspension bridge, the distance value of the main cables is a non-constant value, and the installation construction method can realize that the catwalk is changed from an integral type to a separated type to adapt to the construction requirements of the suspension bridge main cable construction and the steel box girder segment installation; meanwhile, the installation method of the wind-resistant system can well realize that the matching of the wind-resistant system and the catwalk of the suspension bridge is met when the catwalk is of an integral structure, can effectively solve the problem of wind-resistant stability of the integral catwalk of the main cable suspension bridge in a space under a complex wind field environment, and enhances the longitudinal and transverse rigidity of the integral catwalk. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (10)
1. A construction method applied to a catwalk of a spatial main cable suspension bridge is characterized by comprising an installation construction method of the catwalk and an installation construction method of a wind-resistant system;
the installation construction method of the catwalk comprises an integral construction method of the catwalk and a separation construction method of the catwalk, the two catwalks are of an integral structure in the integral construction process of the catwalk, the integral catwalk is separated into the two independent catwalks through the separation construction method of the catwalk, and the integral construction method of the catwalk comprises the following steps:
s11, transporting the anchoring blocks to the tower top to be connected with the pre-embedded climbing cones to finish pre-installation, then anchoring the anchoring blocks on the tower top by using finish rolling deformed steel bars, and connecting the anchoring beams with the large pull rods and the small pull rods after the assembly is finished;
s12, pre-erecting a pilot cable, towing the pilot cable by a ship to cross the sea
The shore is connected with a first guide rope,
the bank and the K bank are respectively opposite banks of the suspension bridge, and the first guide rope drives the second guide rope to be erected on
Between the bank and the K bank, the second guide rope drives the third guide rope to erect
Between the bank and the K bank, the cable diameters of the guide cable, the first guide cable, the second guide cable and the third guide cable are sequentially increased;
s13, drawing the carrier bearing rope through a third guide rope 
The bank is pulled to the K bank and anchored on the top of the K bank; after the bracket bearing rope is erected, a bracket positioning rope is erected and connected with a third guide rope, the bracket is hung on the bracket bearing rope, connecting points are arranged on the bracket positioning rope at intervals in the length direction, and each bracket is correspondingly connected with each connecting point;
s14, erecting a catwalk bearing rope, wherein the catwalk bearing rope passes through a drawing device of a third guide rope
The bank is pulled to the K bank, two ends of the catwalk bearing cable are connected with the small pull rod, the catwalk bearing cable is sequentially erected according to the sequence that the left and right widths are symmetrical and the two sides are symmetrical in a spanning mode, and the erecting sequence is adjusted according to the deviation condition of the main towers at the two banks in the erecting process; a position-changing steel frame is arranged at the front end position where the catwalk bearing rope is connected with the small pull rod to adjust the distance between the catwalk bearing ropes;
s15, drawing a portal frame bearing rope;
s16, paving a catwalk surface net on the catwalk bearing rope;
s17, installing a catwalk handrail and a catwalk portal to complete installation of the whole catwalk;
the catwalk is installed with the wind-resistant system under the integral condition, and the installation and construction method of the wind-resistant system comprises the following steps:
s21, erecting a wind-resistant cable, and dragging the wind-resistant cable to a bracket by using a cable strand traction system;
S22, connecting a catwalk and an anti-wind cable by using an anti-wind suspender;
s23, the wind resisting cable is pulled to the position close to the anchoring device by utilizing a tower top winch matched with a steering device;
s24, connecting an anchor head of the wind-resistant cable to a second pull rod of an anchoring device through the cooperation of a tower crane, then tensioning the wind-resistant cable in the anchoring device through a jack, and installing an anchoring steel belt to complete the fixation of the wind-resistant cable after the tensioning is completed;
the separation construction method of the catwalk comprises the steps of firstly installing the space main cable clamp, then installing the pushing system, and pushing the catwalk from the middle to two sides through the pushing system to form a separated catwalk structure.
2. The construction method applied to the catwalk of the spatial main cable suspension bridge according to claim 1, characterized in that:
in S12, a guide rope is pre-installed on the K bank
Erecting a first guide rope in advance on the bank, and drawing one end of the guide rope to
The bank is connected with the first guide rope, and then the first guide rope is driven by the winch to be pulled to the K bank; pre-erecting a second guide rope on the K bank, connecting the second guide rope with the first guide rope, and driving the first guide rope by a winch to pull the second guide rope to the K bank
A shore; in that
A third guide rope is pre-erected on the bank, the third guide rope is connected with the second guide rope, and the second guide rope is driven by a winch to be drawn to the K bank And finishing the traction.
3. The construction method applied to the spatial main cable suspension bridge catwalk according to claim 1, wherein the construction method comprises the following steps:
in S13, the brackets are uniformly arranged at intervals of 100 m, and the positioning ropes of the brackets are guided by the third guide ropes
The bank is dragged to the K bank, and when every 100 meters of pulling out of bracket location rope, one of them bracket is connected with bracket location rope, carries out in proper order until the bracket location rope drags to the K bank top of the tower.
4. The construction method applied to the catwalk of the spatial main cable suspension bridge according to claim 1, characterized in that:
in S11, the whole assembly of the anchoring beam, the large pull rod and the small pull rod is lifted to the top of the tower by a tower crane and connected with the anchoring block through a steel pin, meanwhile, the two ends of the anchoring beam are lifted on a gantry of the top of the tower by a steel rope and a chain block, and the angle of inclination of the catwalk is adjusted by the chain block.
5. The construction method applied to the catwalk of the spatial main cable suspension bridge according to claim 1, characterized in that:
the method comprises the following steps that the sag of a catwalk bearing rope is adjusted in a triangular elevation measurement mode, the sag of midspan bearing ropes of single bearing ropes is measured in sequence, the sag of the midspan bearing ropes is adjusted by tensioning small pull rods at two ends of the catwalk bearing rope, and two ends of the catwalk bearing rope at the same midspan are symmetrically tensioned at the same time until the corresponding sag positions are adjusted; the side-span catwalk bearing rope is adjusted through a small tension rod at the top of the tensioning tower.
6. The construction method applied to the spatial main cable suspension bridge catwalk according to claim 1, wherein the construction method comprises the following steps:
catwalk veil is laid and is adopted the method of sliding to lay, the tower crane is with veil handling to tower top platform, the manual work is carried the veil to on the catwalk bearing rope, later carry out the ligature of anti-skidding stuff and the installation of big or small square steel, the midspan is with the top of the tower steelframe that shifts to the top of the tower section earlier with plank and veil laid, set up guard rail with this section both sides simultaneously, the side span will adjust the pull rod to the top of the tower section earlier with plank and veil laid, also set up guard rail with this section both sides, set up the counter weight at catwalk veil front end when midspan veil gliding, utilize top of the tower hoist control catwalk surface course to transfer, when catwalk veil can not freely transfer, utilize traction system to pull the catwalk veil and transfer.
7. The construction method applied to the spatial main cable suspension bridge catwalk according to claim 6, wherein the construction method comprises the following steps:
utilize bolt fixed mounting catwalk railing after completion is laid to the catwalk surface course, catwalk railing interval arrangement is on the catwalk, and handrail rope are installed on the catwalk railing through the mode of pulling, later utilize the ligature area to fix railing net and catwalk bearing rope, handrail rope, catwalk railing.
8. The construction method applied to the spatial main cable suspension bridge catwalk according to claim 1, wherein the construction method comprises the following steps:
installing a catwalk portal frame: (1) on the K bank and
assembling catwalk portal frames on tower top approach bridges on two banks of the bank; (2) the catwalk portal frame is lifted to the top of the tower and connected with a portal rope through a U-shaped bolt, the front end of the catwalk portal frame is connected with a traction steel rope, and the rear end of the catwalk portal frame is connected with a top winch reverse-pulling steel rope; (3) firstly, a first catwalk portal frame is pulled to a midspan position, and the catwalk portal frame is connected with a lower cross beam through a steel pin; (4) and sequentially mounting the rest catwalk portal frames to all positions of the top of the two-bank tower and the top of the tower to the anchor.
9. The construction method applied to the spatial main cable suspension bridge catwalk according to claim 1, wherein the construction method comprises the following steps:
the wind-resistant hanging pieces at all positions select fixed steel ropes with corresponding lengths cut off from the steel rope reel by cutting pieces according to the initial installation position conditions, and after the wind-resistant hanging pieces are installed, the linear shapes of the wind-resistant ropes are controlled by adjusting the lengths of adjusting chains on the wind-resistant hanging pieces.
10. The construction method applied to the spatial main cable suspension bridge catwalk according to claim 1, wherein the construction method comprises the following steps:
The anchoring devices are arranged at two ends of the bridge tower bearing platform, and each steering device is arranged on the bridge tower bearing platform between the two anchoring devices and the position where the tower top winch projects on the bridge tower bearing platform.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6429505A (en) * | 1987-07-24 | 1989-01-31 | Ishikawajima Harima Heavy Ind | Method of adjusting catwalk at time of erection of suspension bridge cable through method of air spinning construction |
| CN105401527A (en) * | 2015-12-11 | 2016-03-16 | 中交一公局第三工程有限公司 | Construction method for anchoring catwalk and catwalk anchoring device |
| CN205205679U (en) * | 2015-12-11 | 2016-05-04 | 中交一公局第三工程有限公司 | Catwalk anchor |
| CN108487039A (en) * | 2018-02-28 | 2018-09-04 | 济南城建集团有限公司 | Self-anchored suspension bridge and its cat road separate type construction method |
| CN110424269A (en) * | 2019-08-16 | 2019-11-08 | 中铁二院工程集团有限责任公司 | A kind of end bay construction method of three branch mailbox girder cableway platform |
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2022
- 2022-03-07 CN CN202210216721.0A patent/CN114673088B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6429505A (en) * | 1987-07-24 | 1989-01-31 | Ishikawajima Harima Heavy Ind | Method of adjusting catwalk at time of erection of suspension bridge cable through method of air spinning construction |
| CN105401527A (en) * | 2015-12-11 | 2016-03-16 | 中交一公局第三工程有限公司 | Construction method for anchoring catwalk and catwalk anchoring device |
| CN205205679U (en) * | 2015-12-11 | 2016-05-04 | 中交一公局第三工程有限公司 | Catwalk anchor |
| CN108487039A (en) * | 2018-02-28 | 2018-09-04 | 济南城建集团有限公司 | Self-anchored suspension bridge and its cat road separate type construction method |
| CN110424269A (en) * | 2019-08-16 | 2019-11-08 | 中铁二院工程集团有限责任公司 | A kind of end bay construction method of three branch mailbox girder cableway platform |
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