CN115418967A - Steel box girder type single-tower single-cable-plane cable-stayed bridge construction method - Google Patents
Steel box girder type single-tower single-cable-plane cable-stayed bridge construction method Download PDFInfo
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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
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Abstract
The invention discloses a construction method of a steel box girder type single-tower single-cable-plane cable-stayed bridge, which comprises the following steps: the method comprises the following steps: pouring the cast-in-place concrete box girder section; step two: installing a cable crane; step three: installing a main cable tower and a stay cable laying device; step four: hoisting a steel box girder section and arranging stay cables; step five: carrying out pressure weight construction on the side span and the main span; step six: dismantling hoisting equipment; and in the fourth step, the steel box girder section is hoisted in sections and the stay cables are laid, and the steel box girder section is split into a plurality of girder sections and is hoisted one by one and the corresponding stay cables are laid. Compared with the construction method of the traditional steel box girder type cable-stayed bridge, the construction method of the invention can effectively reduce the potential safety hazard of the construction of the steel box girder section and improve the installation precision by adopting the cable crane to replace a truck crane, a crawler crane and a full-space bracket, and can effectively reduce the construction cost by combining the cast-in-place concrete box girder and the steel box girder.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a construction method of a steel box girder type single-tower single-cable-plane cable-stayed bridge.
Background
The cable-stayed bridge is used as a classic bridge type suitable for various spans, and great achievement is achieved in bridge construction in China. China's cable-stayed bridges are all over the country, and among the bridges, small cable-stayed bridges with the span of less than 50m and large cable-stayed bridges with the span of more than 500m exist; the tower has various towers such as a single tower, double towers, multiple towers, an inclined tower and the like; beam shapes made of various materials such as concrete beams, steel beams, composite beams, hybrid beams and the like; however, in the construction of the existing steel box girder type single-tower single-cable-plane cable-stayed bridge, the construction of the steel box girder is usually carried out by adopting modes such as a truck crane, a crawler crane and a full-hall bracket, the potential safety hazard is large, the installation precision is not high, and the construction cost is usually high, so that the inventor provides a construction method capable of effectively reducing the potential safety hazard, improving the installation precision and reducing the construction cost in daily construction.
Disclosure of Invention
The invention aims to provide a construction method of a steel box girder type single-tower single-cable-plane cable-stayed bridge, which can effectively reduce the potential safety hazard of construction of a main beam section of a steel box and improve the installation precision by using a cable crane to replace a truck crane, a crawler crane and a full-hall bracket, and can effectively reduce the construction cost by combining a cast-in-place concrete box girder with the steel box girder.
The invention is realized by the following technical scheme:
a construction method of a steel box girder type single-tower single-cable-plane cable-stayed bridge comprises the following steps:
the method comprises the following steps: pouring the cast-in-place concrete box girder section;
step two: installing a cable crane;
step three: installing a main cable tower and a stay cable laying device;
step four: hoisting a steel box girder section and arranging stay cables;
step five: carrying out pressure weight construction on the side span and the main span;
step six: dismantling hoisting equipment;
and in the fourth step, the steel box girder section is hoisted in sections and the stay cables are laid, and the steel box girder section is split into a plurality of girder sections and is hoisted one by one and the corresponding stay cables are laid. In order to solve the technical problems and achieve corresponding technical effects, compared with the construction method of the traditional steel box girder type cable-stayed bridge, the construction method of the invention has the advantages that the potential safety hazard of the construction of the main girder section of the steel box can be effectively reduced and the installation precision can be improved by using the cable crane to replace a truck crane, a crawler crane and a full-space bracket, and the construction cost can be effectively reduced by using the combination mode of the cast-in-place concrete box girder and the steel box girder.
The further technical scheme is as follows:
the single-cable-plane cable-stayed bridge comprises a cast-in-place concrete box girder section, a section of steel box girder section, a concrete box girder stay cable group and a steel box girder stay cable group, wherein the cast-in-place concrete box girder section is poured from any one end of the bridge body to the middle and is connected with the steel box girder section, and the steel box girder section extends to the other end of the bridge body;
the stay cables comprise a concrete box girder stay cable group and a steel box girder stay cable group, the concrete box girder stay cable group comprises a plurality of concrete box girder stay cables, the steel box girder stay cable group comprises a plurality of steel box girder stay cables, and one concrete box girder stay cable corresponds to one steel box girder stay cable;
the lower anchor point of the concrete box girder stayed cable is anchored on the cast-in-place concrete box girder section, and the upper anchor point of the concrete box girder stayed cable is anchored on the cable anchor point arranged on the main cable tower;
the lower anchor point of the steel box girder stayed cable is anchored at the steel box girder section, and the upper anchor point of the steel box girder stayed cable is anchored at the cable anchor point arranged on the main cable tower.
Further: and in the second step, cable towers of cable cranes are arranged at the joints of the cast-in-place concrete box girder sections and the steel box girder sections and at the other end of the bridge body, and then the main cable, the traction cable and the hoisting cable are laid.
Further: when the main ropes are laid, a nylon rope with the diameter of 20mm is firstly crossed a river by a ship, then the nylon rope pulls the steel ropes to cross the river, the size of the steel ropes is gradually increased when the steel ropes are pulled to cross the river, and the main ropes are used for finally finishing the laying of the pulling ropes and the hoisting ropes.
Further: in the second step, a main cable tower for laying the stay cables is arranged at the position of a crane of one cable crane, a rotary scaffold is arranged on the main cable tower, a winch is arranged on the rotary scaffold, and a traction rope of the winch is tied up with the stay cables through a tackle pulley.
And further: in the fourth step, when the steel box girder section is hoisted, the steel box girder section is split into a beam section A close to the main tower, a beam section D far away from the main tower, a beam section B in the middle and a beam section C for final connection and assembly;
further: firstly, hoisting a beam section A, grouting after the beam section A is hoisted to a mounting position close to a main cable tower, connecting the beam section A with a cast-in-place concrete box beam section close to the main cable tower, and then laying corresponding stay cables;
further: hoisting the beam section B after the beam section A is constructed, splitting the beam section B into a plurality of beam sections, hoisting one by one, welding the beam sections B, and then laying corresponding stay cables;
further: hoisting the D beam section after the construction of the B beam section is finished, connecting the D beam section with the cast-in-place concrete box beam section far away from the main cable tower by grouting after the D beam section is hoisted to the installation position far away from the main cable tower, and then laying a corresponding stay cable;
further: and C beam sections are hoisted after the D beam sections are constructed, the lengths of the two ends of the C beam sections are determined according to the distance between the B beam sections and the D beam sections, the C beam sections with the determined lengths are hoisted to the position between the B beam sections and the D beam sections, then the beam sections of the C beam sections are welded with the B beam sections and the D beam sections respectively to complete full bridge and gantry, and then corresponding stay cables are laid.
And further: when the B beam section is constructed, the B beam section is split into a plurality of beam sections with the length of 12m, and each beam section is hoisted in place and then welded.
And further: and before the beam sections are connected, the plane position and elevation of the beam sections are adjusted by a three-way jack.
Further: in the fourth step, the method for laying the stay cables specifically comprises the following steps: mounting a beam part of the stay cable, and when the lower anchor head is hoisted to a beam end anchoring position, utilizing a steel strand soft traction cable to penetrate through a beam end anchorage device to complete the anchoring of the lower anchor head and the beam section;
and further: and (3) mounting the tower end of the stay cable, firstly transferring the upper anchor head to the position below the anchoring position of the tower end, starting a winch to lower down the traction rope, connecting the upper anchor head through a pulley set, lifting the upper anchor head to the anchoring position of the tower end, and completing the anchoring of the upper anchor head and the main cable tower by using a steel strand soft traction cable to penetrate through an anchorage device of the tower end.
Further: in the sixth step, after the side span and the main span are constructed by pressing, the cable crane and the bracket for supporting the beam section are dismantled, and the tension of the stay cable and the line type of the bridge floor are adjusted to complete the full-bridge construction.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. compared with the construction method of the traditional steel box girder type cable-stayed bridge, the construction method of the steel box girder type single-tower single-cable-plane cable-stayed bridge has the advantages that potential safety hazards of construction of the steel box girder section can be effectively reduced and installation accuracy is improved by replacing a truck crane, a crawler crane and a full-hall support with a cable crane, and construction cost can be effectively reduced by combining a cast-in-place concrete box girder with the steel box girder.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort. In the drawings:
FIG. 1 is a flow chart of the construction of the present invention;
FIG. 2 is a schematic structural view of a steel box girder type single-tower single-cable-plane cable-stayed bridge according to the present invention;
FIG. 3 is a schematic structural view of a main cable tower and stay cable laying device;
FIG. 4 is a schematic construction view of the A beam section;
FIG. 5 is a schematic construction view of a B beam section;
FIG. 6 is a schematic view of a D-beam section construction;
fig. 7 is a schematic construction diagram of a C-beam section.
Reference numbers and corresponding part names in the drawings:
the method comprises the following steps of 1-cast-in-place concrete box girder section, 2-cable crane, 3-main cable tower, 4-steel box girder section, 5-concrete box girder stay cable group, 6-steel box girder stay cable group, 31-rotary scaffold, 32-winch, 33-traction rope and 34-pulley group.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limiting the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order to avoid obscuring the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Examples
As shown in fig. 1 to 7, the construction method of the steel box girder type single-tower single-cable-plane cable-stayed bridge of the invention comprises the following steps:
the method comprises the following steps: pouring the cast-in-place concrete box girder section 1;
step two: installing a cable crane 2;
step three: installing a main cable tower 3 and a stay cable laying device;
step four: hoisting the steel box girder section 4 and arranging the stay cables;
step five: carrying out pressure weight construction on the side span and the main span;
step six: dismantling hoisting equipment;
and in the fourth step, the steel box girder section 4 is hoisted in sections and the stay cables are laid, and the steel box girder section 4 is split into a plurality of girder sections and is hoisted one by one and the corresponding stay cables are laid. In the embodiment, the total length of the cable-stayed bridge is 268m, the construction is carried out by adopting a main span 175m single-tower single-cable-plane mixed beam cable-stayed bridge, the span combination of a bridge body is 81+175m, and the width of the bridge deck is 32m. And the hoisting type of the steel box girder section 4 adopts the cable crane 2 to replace the traditional mode of truck crane, crawler crane and full-hall bracket construction, so that the potential safety hazard of the steel box girder section construction can be effectively reduced, the installation precision is improved, and the construction cost can be effectively reduced by combining the cast-in-place concrete box girder and the steel box girder.
The single-cable-plane cable-stayed bridge comprises a cast-in-place concrete box girder section 1, a steel box girder section 4, a concrete box girder cable-stayed cable group 5 and a steel box girder cable-stayed cable group 6, wherein the cast-in-place concrete box girder section 1 is poured from any one end of a bridge body to the middle and is connected with the steel box girder section 4, and the steel box girder section 4 extends to the other end of the bridge body;
the inclined stay cables comprise a concrete box girder inclined stay cable group 5 and a steel box girder inclined stay cable group 6, wherein the concrete box girder inclined stay cable group 5 comprises a plurality of concrete box girder inclined stay cables, the steel box girder inclined stay cable 6 group comprises a plurality of steel box girder inclined stay cables, and one concrete box girder inclined stay cable corresponds to one steel box girder inclined stay cable;
the lower anchor point of the concrete box girder stayed cable is anchored on the cast-in-place concrete box girder section 1, and the upper anchor point of the concrete box girder stayed cable is anchored on the cable anchor point arranged on the main cable tower 3; the lower anchor point of the steel box girder stayed cable is anchored on the steel box girder section 4, and the upper anchor point of the steel box girder stayed cable is anchored on the cable anchor point arranged on the main cable tower 3. In this embodiment, the west bank of the bridge body is selected to pour the cast-in-place concrete box girder section 1, the length of the cast-in-place concrete box girder section 1 is preferably 81m, and the main cable tower 3 is installed and fixed on the cast-in-place concrete box girder section 1, so that the stability of the main cable tower 3 can be effectively ensured, the stability of the whole bridge body is ensured, the tension of the steel box girder stay cable group 6 is balanced by using the concrete box girder stay cable group 5, and the danger that the main cable tower 3 topples and the like is avoided.
In the second step, cable towers of cable hangers 2 are arranged at the joint of the cast-in-place concrete box girder section 1 and the steel box main girder section 4 and at the other end of the bridge body, and then the main cable, the traction cable and the hoisting cable are laid.
When the main ropes are laid, a nylon rope with the diameter of 20mm is firstly crossed a river by a ship, then the nylon rope pulls the steel ropes to cross the river, the size of the steel ropes is gradually increased when the steel ropes are pulled to cross the river, and the main ropes are used for finally finishing the laying of the pulling ropes and the hoisting ropes. In this embodiment, the general arrangement of the cable crane 2 is as follows: the span of the cable crane main cable is arranged to be 89m (west bank side span) +242m +50m (east bank side span), all spans are continuously arranged, a middle turning point is supported on a cable saddle of a tower, two ends of the middle turning point are fixed on an anchor device, the vertical distance between the west bank saddle top and an anchor is 27m, the vertical distance between the east bank saddle top and the anchor is 21.5m,the maximum sag ratio of the main cable in construction is fmax/L =1/14. The main rope is divided into 2 groups, each group is composed of
(8X36SW + IWR) steel core steel wire rope, and the center distance between the two groups of main wires is 13m; each group of main cables is provided with 1 carriage, each lifting point is designed with a lifting weight of 100t, and the cable crane can bear 200t of lifting weight. The traction cable is threaded and wound in a mode of a phi 26 steel wire rope going to be 4', two traction winches of 10t are arranged in front of each anchorage on the corresponding two banks, and 4 traction winches are arranged in total. The hoisting cable is threaded in a mode of 8 walking of a phi 32 steel wire rope, two ends of the hoisting cable are respectively wound on 15t hoisting winch rollers on two banks, and one sports car corresponds to one set of hoisting equipment. The lifting and the traction of two sports cars with two groups of main ropes of the same type and close to each other in the transverse bridge direction must be synchronous. The cable saddle adopts a double-row rolling pulley mode, and the row of pulleys close to one side of the ground anchor is lower so as to reduce the bending stress of the main cable. The number of pulleys of the cable saddle in the transverse bridge direction is determined by the number of main cables. Two independent pulleys can be arranged at the upper part of the cable saddle and used for passing the traction cable. A hoisting cable pulley is arranged below the main cable pulley; therefore, the traction cable and the hoisting cable can be obviously separated, and hoisting is facilitated. The cable tower is assembled by adopting combined steel pipe trusses, the plane of the cable tower is 4m multiplied by 4m, the height of the cable tower on the west bank is 27m, and the height of the cable tower on the east bank is 32.7m. Two limbs of the west-shore cable tower are transversely connected, the outer side of the tower column strides over a main tower of a cable-stayed bridge, and the distance between the tower column and the main tower is 30cm, so that the cable tower is not contacted with the main tower when deflecting; the middle of the bottom and the top of the east-shore cable tower adopt a 4m multiplied by 4m structural tie beam. The west main tower foundation is arranged on the box girder, and the east main tower adopts a short pile bearing platform foundation. And (3) anchoring the ground: the west shore anchor is positioned behind the side span bridge abutment, and gravity type anchor and pile-composite anchor are adopted, 2 of each anchor are respectively provided with wind cables. The east bank anchor is located the mountain foot department, adopts rock anchor, and each 2, the tower cable wind and the horizontal cable wind cable anchor during hoist and mount generally do not receive big atress, adopts to dig the pit and buries horizontal stone anchor underground.
The cable tower comprises a base, a tower body, a tower top, a cable saddle and the like. The base adopts C25 concrete, the steel sheet of being connected with the body of the tower will be pre-buried when concreting to will weld anchor muscle, the concrete must closely knit. The connection of the base and the tower body adopts pin joint and adopts a special six-four military beamWith a pin. The tower body is assembled section by section, a single-foot derrick mast is arranged on the basis of the assembled tower body, and the derrick mast is used for lifting the truss sections for assembly. During assembly, the towers on two sides need to be taken care of simultaneously, when the wind structure is installed at a certain height, the wind structure needs to be transversely arranged, and the temporary wind-resistant cable needs to be longitudinally arranged. And after the complete installation, a permanent wind-resistant cable is arranged. The tower top is longitudinally welded with 2 pieces of 56I-shaped steel side by side, the bottom of the I-shaped steel is welded with a 2cm steel plate and is connected with the tower body through a pin, 2 pieces of 56I-shaped steel are erected on the two longitudinal I-shaped steel, the longitudinal and transverse I-shaped steel needs to be welded firmly and fully welded, and the cross beam cannot turn over. In order to ensure that the main cable smoothly passes through the cable saddle, the top of the cable saddle is made into a semi-arc shape, and the radius is 30cm. With 13 freely rollable bottom
The bottom plate and the cross beam are firmly welded, the bottom plate is connected with the cable saddle in a left-hand thread mode, and a free rolling space of 15mm is reserved on each side. Thus, the cable saddle has 30mm displacement under the influence of the hoisting weight and the temperature, and the friction loss between the cable saddle and the main cable is reduced.
Installing a main rope: because the two banks are not navigable, a 2cm nylon rope is firstly used by the ship to cross the river, and a nylon rope belt 15mm steel wire rope is used, so that the nylon rope belt is replaced step by step, and finally the main rope is pulled to cross the river. When the main rope is pulled to pass through a river, certain sag must be ensured in order to reduce the stress of the winch. In order to ensure that the main cables can be received as uniformly as possible in the using process, the two main cables are combined together and wound on the ground anchor for two circles, and the main cables can be adjusted according to the sag and the stress condition. The installation sag of the main cable is in accordance with the design value, and if the installation sag is smaller than or excessively smaller than the design value, important components such as the main cable, the ground anchor, the cable tower and the like are overloaded or severely overloaded, which is very dangerous. On the contrary, if the cable installation sag is larger than the design value, the working sag is increased, so that the up-and-down gradient of the component during hoisting is increased, and the traction force is increased. If the added value is too large, auxiliary traction needs to be arranged, and even the safety height of the bridge span structure which is installed cannot be met, the installation workload of the components is increased, so that the installation is difficult. The control stress and initial sag at installation must be calculated before installing the main cable.
Installation of the hoisting cable: the pulley (vehicle) group adopts 3 wheels at the top and 2 wheels at the bottom to form a 4-line pulley block, and for avoiding twisting, the 2 wheels at the bottom adopt a separated type pulley group. Hoisting cable adopts
One end of the hoisting cable is fixed on the winch, and the other end of the hoisting cable bypasses the lifting hook and is fixed on the sports car. The length of the hoisting cable is ensured, and when the hoisting cable is lifted to the farthest position, the steel wire rope on the winch is not less than 6 circles.
Installation of a traction cable: traction cable adoption
The steel wire rope adopts a serial rolling mode to draw. One end of the traction cable is fixed on the sports car, then the traction cable bypasses a main cable on the opposite bank of a river, a fixed pulley on an anchor and a main tower and a fixed pulley on the opposite bank, in order to increase the friction force between the traction cable and a winch, a steel wire rope is wound on the winch for 6 circles, and finally the fixed pulley bypassing the main tower is fixed on the sports car.
Installation of main rope sports car and lifting hook: the main cable sports car adopts a 2-door self-made sports car, the pulley wheel diameter is 25 cm in contact with the main cable, and the fixed pulley diameter is 34 cm.
In the second step, a main pylon 3 for laying the stay cables is arranged at the position of a crane of the cable crane 2, a rotary scaffold 31 is arranged on the main pylon 3, a winch 32 is arranged on the rotary scaffold 31, and a traction rope 33 of the winch 32 is used for tying the stay cables through a pulley block 34. In this embodiment, after the main rope tower 3 is installed, the rotating scaffold 31 is assembled on the top of the main rope tower 3 by universal rods, in order to meet the requirements of installation of guys in different directions of the tower, a rotating support is arranged between the rotating scaffold 31 and the top of the main rope tower 3 to realize 360-degree rotation of the rotating scaffold 31, and the rotating scaffold 31 can be pulled in a corresponding direction by a chain block to realize rotation. The tower top rotary scaffold 31, the winch 32, the traction rope 33 and the pulley block 34 are equivalent to a small tower crane installed on the tower top and are main hoisting equipment when a tower part guy cable is hung.
In the fourth step, when the steel box girder section 4 is hoisted, the steel box girder section 4 is split into a girder section A close to the main tower, a girder section D far away from the main tower, a girder section B in the middle and a girder section C for final connection and assembly;
firstly, hoisting a beam section A, grouting after the beam section A is hoisted to a mounting position close to a main cable tower 3, connecting the beam section A with a cast-in-place concrete box girder section 1 close to the main cable tower 3, and then laying corresponding stay cables;
hoisting the beam section B after the beam section A is constructed, splitting the beam section B into a plurality of beam sections, hoisting the beam sections one by one, welding the beam sections B, and then laying corresponding stay cables;
hoisting the beam section D after the beam section B is constructed, connecting the beam section D with the cast-in-place concrete box beam section 1 far away from the main cable tower 3 by grouting after the beam section D is hoisted to the installation position far away from the main cable tower 3, and then laying a corresponding stay cable;
and C beam sections are hoisted after the D beam sections are constructed, the lengths of the two ends of the C beam sections are determined according to the distance between the B beam sections and the D beam sections, the C beam sections with the determined lengths are hoisted to the position between the B beam sections and the D beam sections, then the beam sections of the C beam sections are welded with the B beam sections and the D beam sections respectively to complete full bridge and gantry, and then corresponding stay cables are laid. In the embodiment, when all box girder sections are constructed, a large hoisting site is determined near a construction site, a section steel box girder is hoisted to an installation area by a cable crane, a positioning code plate is welded at an interface of an installed section to position the relative position of the box girder section, temporary bolts are connected, the relative position of the box girder is adjusted by a chain block at the interface, the absolute position of the box girder on the whole bridge is adjusted by the cable crane, a total station monitors and adjusts the absolute position of the box girder to a correct spatial position and then fastens and positions the connecting bolts for welding, and the cable crane does not loose hooking before the welding of a box girder installation interface and the pretensioning of a stayed locking cable are not completed. Under the concrete construction method of the steel box girder section 4, four-point hoisting is adopted for hoisting each box girder section. Before hoisting, large-volume equipment such as a dehumidifier and the like which are permanently placed in the box are placed in the corresponding beam section in advance, and then hoisting can be carried out. After the beam sections are hoisted in place, the beam sections are temporarily connected with the adjacent beam sections,the plate is adjusted by pins to stagger the edges, and the temporary connection counter-pull screw is screwed down to the designed seam width and then fixed. Firstly, welding the transverse circular seams of the peripheral plates, and welding the longitudinal stiffening rib embedding sections after the nondestructive inspection is qualified. And after the beam sections are inspected to be qualified, performing necessary polishing treatment on the welding seams to finish the beam section connection. In order to facilitate manual carrying and stacking, the counterweight material adopts heavy concrete blocks, and the specific gravity of the material is not less than 36KN/m 3 . The balancing weight is horizontally and uniformly arranged in the steel box girder, the section steel is arranged upwards on the U-rib transverse bridge of the bottom plate, the steel base plate with the thickness of 6mm is arranged on the U-rib transverse bridge, the U-rib transverse bridge is welded on the section steel to be fixed, the surrounding structure is arranged on the periphery of the steel base plate, the balancing weight is stably and reliably arranged on the steel base plate, and the weight of the steel base plate and the lower section steel is considered when paying attention to the balancing weight. The position of the accumulation block can be properly and transversely adjusted near the human hole, so that people can conveniently go in and out.
When the B beam section is constructed, the B beam section is split into a plurality of beam sections with the length of 12m, and the beam sections are hoisted in place and then welded. In the embodiment, the beam section B is split into 12 small beam sections (B1-B12), temporary weight pressing is carried out on the main span beam section B1-B10 during hoisting, and the temporary weight pressing load is 72.9KN/m along the longitudinal bridge direction, so that the bending moment of the main beam near the cable tower in the construction engineering is reduced. The temporary weight takes a 12m long beam section as a loading unit, and the time of temporary weight lags behind the time of hoisting two beam sections by the main span beam section. The temporary ballast weight is removed and the bridge deck system construction is carried out synchronously, so that the load born by the main beam is not changed excessively.
And before the beam sections are connected, the plane position and elevation of the beam sections are adjusted through the three-way jack. In the embodiment, the height of the end of each box girder section must be determined before sunrise in the construction process. After the elevation of the beam end is determined, the temporary matching pieces are quickly connected, and then seam welding work is carried out. In principle, after all welding seam quality inspection is qualified, the stay cable can be tensioned for the first time, and the crane can be loosened and moved forwards after the stay cable is tensioned in place.
In the fourth step, the method for laying the stay cables specifically comprises the following steps: mounting a beam part of the stay cable, and when the lower anchor head is hoisted to a beam end anchoring position, penetrating the beam end anchorage device by using the steel strand soft traction cable to complete the anchoring of the lower anchor head and the beam section; the installation of the stay cable tower end is that the upper anchor head is firstly transferred to the position below the anchor of the tower end, the winch 32 is started to release the traction rope 33, the upper anchor head is connected through the pulley block 34 and is lifted to the anchor position of the tower end, and the steel strand soft traction rope penetrates through the anchor of the tower end to complete the anchoring of the upper anchor head and the main cable tower 3. In the embodiment, the beam end is anchored firstly, and then the tower is pulled and tensioned for anchoring. The stayed-cable is conveyed to a bridge position, and the stayed-cable is directly lifted integrally to the upper bridge floor by a tower crane and placed on a horizontal cable tray; a winch on the bridge deck pulls the anchor head at the beam end to the cantilever end beam section to be installed, and then a 25t truck crane is adopted to hoist the lower anchor head of the stay cable to the beam end anchoring point for anchoring; a tackle pulley 34 lifts the upper anchor head of the stay cable under the traction coordination of a winch at the root of the main cable tower 3 to assist in completing the expansion of the bridge deck, and the winch 32 at the top of the main cable tower 3 is used for hoisting the upper anchor head to the anchor point at the tower end for anchoring; and finally, tensioning and cable adjusting at the tower end.
In the sixth step, after the side span and main span ballast weight construction is completed, the cable crane 2 and the support used for supporting the beam section are removed, and the tension of the stay cable and the bridge floor line type are adjusted to complete the full-bridge construction. In this embodiment, in order to adapt the stay cables to the dead weights of the side span cast-in-place concrete box girder section 1 and the steel box main girder section 4, the side span and the main span need to be weighted before the side span bracket and the D girder section bracket are detached. And after the weight is pressed, dismantling the 2 supports.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A construction method of a steel box girder type single-tower single-cable-plane cable-stayed bridge is characterized by comprising the following steps:
the method comprises the following steps: pouring the cast-in-place concrete box girder section (1);
step two: installing a cable crane (2);
step three: installing a main cable tower (3) and a stay cable laying device;
step four: hoisting the steel box girder section (4) and arranging the stay cables;
step five: carrying out pressure weight construction on the side span and the main span;
step six: dismantling hoisting equipment;
and in the fourth step, the steel box girder section (4) is hoisted in sections and the stay cables are laid, and the steel box girder section (4) is split into a plurality of beam sections and is hoisted one by one and the corresponding stay cables are laid.
2. The construction method of the steel box girder type single-tower single-cable-plane cable-stayed bridge according to claim 1, wherein the single-cable-plane cable-stayed bridge comprises a cast-in-place concrete box girder section (1), a steel box girder section (4), a concrete box girder stay cable group (5) and a steel box girder stay cable group (6), the cast-in-place concrete box girder section (1) is cast from any one end of a bridge body to the middle and is connected with the steel box girder section (4), and the steel box girder section (4) extends to the other end of the bridge body;
the stay cables comprise a concrete box girder stay cable group (5) and a steel box girder stay cable group (6), the concrete box girder stay cable group (5) comprises a plurality of concrete box girder stay cables, the steel box girder stay cable group (6) comprises a plurality of steel box girder stay cables, and one concrete box girder stay cable corresponds to one steel box girder stay cable;
the lower anchor point of the concrete box girder stayed cable is anchored on the cast-in-place concrete box girder section (1), and the upper anchor point of the concrete box girder stayed cable is anchored on the stayed cable anchor point arranged on the main cable tower (3);
the lower anchor point of the steel box girder stayed cable is anchored on the steel box girder section (4), and the upper anchor point of the steel box girder stayed cable is anchored on the cable anchor point arranged on the main cable tower (3).
3. The construction method of the steel box girder type single-tower single-cable-plane cable-stayed bridge according to claim 2, characterized in that in the second step, cable towers with cable hangers (2) are arranged at the connection part of the cast-in-place concrete box girder section (1) and the steel box girder section (4) and at the other end of the bridge body, and then main cables, traction cables and hoisting cables are arranged.
4. The construction method of the steel box girder type single-tower single-cable-plane cable-stayed bridge according to claim 3, wherein the main cable is laid by passing a 20mm nylon cable through the river by a ship, then pulling the cable through the nylon cable, gradually increasing the size of the cable when the pulling cable passes the river, and finally finishing the laying of the pulling cable and the hoisting cable by the main cable.
5. The construction method of the steel box girder type single-pylon single-cable-plane cable-stayed bridge according to claim 3, wherein in the second step, a main pylon (3) for arranging the stay cables is arranged at the position of a crane of one cable crane (2), a rotary scaffold (31) is arranged on the main pylon (3), a winch (32) is arranged on the rotary scaffold (31), and the stay cables are tied by a traction rope (33) of the winch (32) through a pulley block (34).
6. The construction method of the steel box girder type single-tower single-cable-plane cable-stayed bridge according to claim 1, characterized in that in the fourth step, when the steel box girder section (4) is hoisted, the steel box girder section (4) is split into an A girder section close to a main tower, a D girder section far away from the main tower, a middle B girder section and a C girder section for final connection and assembly;
firstly, hoisting a beam section A, connecting the beam section A with a cast-in-place concrete box beam section (1) close to a main cable tower (3) after the beam section A is hoisted to a mounting position close to the main cable tower (3) by grouting, and then laying a corresponding stay cable;
hoisting the beam section B after the beam section A is constructed, splitting the beam section B into a plurality of beam sections, hoisting the beam sections one by one, welding the beam sections B, and then laying corresponding stay cables;
hoisting the beam section D after the beam section B is constructed, grouting after the beam section D is hoisted to the installation position far away from the main cable tower (3), connecting the beam section D with the cast-in-place concrete box beam section (1) far away from the main cable tower (3), and then laying corresponding stay cables;
and C beam sections are hoisted after the D beam sections are constructed, the lengths of the two ends of the C beam sections are determined according to the distance between the B beam sections and the D beam sections, the C beam sections with the determined lengths are hoisted to the position between the B beam sections and the D beam sections, then the beam sections of the C beam sections are welded with the B beam sections and the D beam sections respectively to complete full bridge and gantry, and then corresponding stay cables are laid.
7. The construction method of the steel box girder type single-tower single-cable-plane cable-stayed bridge according to claim 6, characterized in that when the B-beam section is constructed, the B-beam section is split into a plurality of beam sections with the length of 12m, and each beam section is hoisted in place and then welded.
8. The method as claimed in claim 6, wherein the planar position and elevation of the girder sections are adjusted by three-way jacks before the girder sections are connected.
9. The construction method of the steel box girder type single-tower single-cable-plane cable-stayed bridge according to claim 5, wherein in the fourth step, the arrangement method of the stay cables is as follows: mounting a beam part of the stay cable, and when the lower anchor head is hoisted to a beam end anchoring position, penetrating the beam end anchorage device by using the steel strand soft traction cable to complete the anchoring of the lower anchor head and the beam section;
and the installation of the tower end of the stay cable comprises the steps of firstly transferring the upper anchor head to the position below the anchoring position of the tower end, starting a winch (32) to lower a traction rope (33), connecting the upper anchor head through a pulley block (34), lifting the upper anchor head to the anchoring position of the tower end, and completing the anchoring of the upper anchor head and a main cable tower (3) by penetrating a steel strand soft traction cable through the anchoring position of the tower end.
10. The construction method of a steel box girder type single-tower single-cable-plane cable-stayed bridge according to claim 1, wherein in the sixth step, when the side span and the main span are heavily constructed, the cable crane (2) and the bracket for supporting the girder section are removed, and the tension of the stay cable and the line shape of the bridge floor are adjusted to complete the full-bridge construction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211191865.1A CN115418967A (en) | 2022-09-28 | 2022-09-28 | Steel box girder type single-tower single-cable-plane cable-stayed bridge construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211191865.1A CN115418967A (en) | 2022-09-28 | 2022-09-28 | Steel box girder type single-tower single-cable-plane cable-stayed bridge construction method |
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| CN202211191865.1A Pending CN115418967A (en) | 2022-09-28 | 2022-09-28 | Steel box girder type single-tower single-cable-plane cable-stayed bridge construction method |
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