CN112376427A - Installation platform, system and construction method for arch bridge outer concrete bottom die - Google Patents
Installation platform, system and construction method for arch bridge outer concrete bottom die Download PDFInfo
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- CN112376427A CN112376427A CN202011044124.1A CN202011044124A CN112376427A CN 112376427 A CN112376427 A CN 112376427A CN 202011044124 A CN202011044124 A CN 202011044124A CN 112376427 A CN112376427 A CN 112376427A
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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
- E01D4/00—Arch-type bridges
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Abstract
The invention belongs to the technical field of bridge engineering, and particularly relates to an installation platform, a system and a construction method for an arch bridge outer concrete bottom die. This mounting platform includes the backup pad, is provided with the lifting hook that is used for the cableway to lift by crane in the backup pad, and the upper surface of backup pad has set firmly the guide rail, and sliding fit has slider on the guide rail, and slider is used for driving the die block and removes on the guide rail. After the bottom die is lifted to the sliding device by the working cableway, the sliding device can drive the bottom die to move on the guide rail, and then after the supporting plate is lifted to the lower side of the main arch, the bottom die can be moved to the lower side of the main arch through the sliding device, so that the bottom die does not need to be moved to the lower side of the main arch through the cooperation of the main cableway and the working cableway at the same time, the installation platform can help workers to improve the installation efficiency of the bottom die, and the construction period of bottom die installation is shortened.
Description
Technical Field
The invention belongs to the technical field of bridge engineering, and particularly relates to an installation platform, a system and a construction method for an arch bridge outer concrete bottom die.
Background
In the technical field of bridge engineering, when a bridge is constructed, the hoisting and fixing of a bottom die are very important, and generally hoisting methods for the bottom die comprise a belt-first type and a belt-last type.
The 'early-banding type' means that the arch sections are transported to a construction site after being processed, the bottom die is assembled to the bottoms of the arch sections and fixed before the arch sections are hoisted, and then the bottom die is hoisted in place along with the main arch when the arch sections are hoisted. The 'rear belt type' means that the arch segments are transported to a construction site after being processed, then the arch segments are hoisted, and after the main arch is hoisted, the bottom die is sequentially installed in place from the arch springing to the arch crown.
However, in the installation of the bottom die of the "back belt type", the bridge is generally located in a steep mountain, the river surface is narrow and is located at the air port, the inclination angle of the main arch is large at the part of the main arch close to the arch foot, and when the bottom die is installed, the left and right arches are required to be simultaneously installed, so that the installation is carried out by matching the main cableway and the working cableway when the bottom die is installed, thereby causing a long period of installation of the bottom die, low efficiency and high risk of installation of the bottom die.
Disclosure of Invention
The invention aims to solve the problems of long period and low efficiency of bottom die installation in the process of bottom die installation of a 'rear belt type' in the prior art, and provides an installation platform, an installation system and a construction method for an arch bridge outer concrete bottom die, which can help workers to improve the installation efficiency of the bottom die and shorten the construction period of bottom die installation.
In order to achieve the above purpose, the invention provides the following technical scheme:
a mounting platform for arched bridge outsourcing concrete die block, including the backup pad, be provided with the lifting hook that is used for the cableway to lift by crane in the backup pad, the upper surface of backup pad has set firmly the guide rail, and sliding fit has slider on the guide rail, and slider is used for driving the die block and removes on the guide rail.
In the mounting platform provided by the invention, the supporting plate is provided with the lifting hook, so that the supporting plate is conveniently lifted to the lower part of the main arch by the main cableway, and the bottom die is conveniently mounted subsequently; in this mounting platform, be provided with the guide rail in the backup pad, the adaptation has the sliding device on the guide rail to after the die block is lifted by the cableway in work on the sliding device, the sliding device can drive the die block and remove on the guide rail, and then after the backup pad is lifted by crane the below of main arch, can move the die block to under the main arch through the sliding device, and cooperate the hoisting device again, install the corresponding installation segment section on the main arch with the die block. The bottom die can be moved to the position under the main arch through the sliding device of the mounting platform, so that the bottom die can be moved to the position under the main arch without the cooperation of the main cableway and the working cableway, the mounting platform can help workers to improve the mounting efficiency of the bottom die, the construction period of bottom die mounting is shortened, and the construction difficulty is reduced.
Furthermore, one side of the supporting plate is fixedly provided with a first supporting plate, the other side of the supporting plate is fixedly provided with a second supporting plate, the first supporting plate and the second supporting plate are oppositely arranged, and the lifting hook is fixedly arranged on the first supporting plate and the second supporting plate respectively. Through the structure, the stability of the supporting plate is kept in the process of lifting the supporting plate, and the safety in the construction process can be improved.
Furthermore, the first support plate and the second support plate are both truss members, the first support plate and the second support plate are connected through the Bailey beam, and the support plate is fixedly arranged at the upper end of the Bailey beam. Through the structure, the mounting platform can be conveniently dismounted, the first support plate and the second support plate of the mounting platform can be repeatedly used, and the manufacturing cost can be further saved; and the whole weight of the installation platform can be reduced, so that the safety in the construction process can be improved.
Furthermore, the truss component adopts double-spliced channel steel as main rods, and the upper main rod and the lower main rod are connected by adopting a first I-shaped steel; the upper and lower layers of the Bailey beam are of a cross bracing structure. Through above-mentioned structure, can improve this mounting platform structure's stability.
Furthermore, at least two second I-beams are fixedly arranged between the Bailey beam and the supporting plate, all the second I-beams are arranged on the Bailey beam at intervals, and the second I-beams are used for enhancing the structural strength of the supporting plate.
Furthermore, the upper surface of the supporting plate is provided with a protective railing, and the periphery of the upper surface of the supporting plate is provided with a foot baffle plate for preventing the devices on the supporting plate from falling off;
the top surface of first extension board and the top surface of second extension board all are higher than the top surface of backup pad, and the guardrail bar sets up along the circumference of backup pad to guardrail bar, first extension board and second extension board form annular structure altogether. By the structure, the safety of workers in operation on the mounting platform can be improved, and devices on the supporting plate can be prevented from falling off; and the part that can make first backup pad be higher than the backup pad and the part that the second backup pad is higher than the backup pad protects the staff to can reduce the use amount of preventing guardrail bar, and then can save this mounting platform's manufacturing cost.
The invention provides an installation system, which comprises a main arch, a main cableway and a working cableway, and also comprises a hoisting device and the installation platform for the bottom die of the concrete coated outside the arch bridge, wherein the main cableway can hoist the installation platform to the lower part of the main arch, the working cableway can hoist the bottom die to the installation platform, and a sliding device can move the bottom die to the position right below the main arch; the lifting device is used for lifting the bottom die to the mounting position of the corresponding mounting segment on the main arch.
The mounting system provided by the invention can improve the mounting efficiency of the bottom die, shorten the construction period of bottom die mounting and reduce the construction difficulty of bottom die mounting.
Furthermore, the lifting device comprises a first lifting device arranged on the main arch and an upper second lifting device arranged on the mounting platform, and the first lifting device and the second lifting device are respectively positioned at two ends of the bottom die. The first lifting device and the second lifting device respectively lift the bottom die at two ends of the bottom die, so that the stability of the bottom die in the lifting process can be guaranteed, the lifting efficiency of the bottom die can be improved, and the mounting efficiency of the bottom die can be further improved.
Furthermore, the lifting device also comprises a third lifting device, and the third lifting device is positioned on the mounting platform and used for adjusting the position of the bottom die in the lifting process. Through the third hoisting device, the position of the bottom die in the lifting process can be adjusted, and the position accuracy of the bottom die on the main arch can be further ensured.
The invention also provides a construction method which is suitable for mounting the bottom formwork of the concrete wrapped outside the arch bridge, and based on the mounting system, the construction method comprises the following steps:
s1, hoisting the mounting platform to the lower part of the main arch;
s2, hoisting the assembled bottom die to a sliding device of the mounting platform, and moving the bottom die to the position right below the main arch through the sliding device;
s3, lifting the bottom die to the mounting position of the corresponding mounting segment on the main arch through the lifting device, and mounting a cushion block on the mounting segment corresponding to the main arch to enable the bottom die to be tightly attached to the cushion block;
and S4, enabling the hanging ribs to penetrate through the inner side of the bottom die, locking the gasket on the bottom side of the bottom die, and welding the contact part of the hanging ribs and the main chord tubes.
According to the construction method provided by the invention, through the matching of the hoisting device and the sliding device, the installation efficiency of the bottom die can be improved, the construction period of bottom die installation can be shortened, and the construction difficulty of bottom die installation can be reduced.
Compared with the prior art, the invention has the beneficial effects that:
1. the mounting platform for the bottom die of the arch bridge outer-wrapped concrete can improve the mounting efficiency of the bottom die, shorten the construction period of the bottom die mounting and reduce the construction difficulty of the bottom die mounting.
2. According to the mounting platform for the arch bridge outer-wrapped concrete bottom die, the first support plate and the second support plate are truss members, so that the mounting platform can be repeatedly used, and economic benefits of saving project cost and recycling are achieved.
3. The installation platform for the arch bridge outer-wrapped concrete bottom die has high safety coefficient, and can reduce the probability of safety accidents of workers during operation.
4. The mounting system provided by the invention can improve the mounting efficiency of the bottom die, shorten the construction period of bottom die mounting and reduce the construction difficulty of bottom die mounting.
5. The construction method can improve the installation efficiency of the bottom die, shorten the construction period of bottom die installation and reduce the construction difficulty of bottom die installation.
Description of the drawings:
fig. 1 is a schematic structural view of the mounting platform of the present invention.
FIG. 2 is a schematic cross-sectional view of A-A in FIG. 1.
FIG. 3 is a schematic cross-sectional view of B-B in FIG. 1.
Fig. 4 is a schematic cross-sectional view of C-C in fig. 3.
Fig. 5 is a schematic cross-sectional view of D-D in fig. 3.
Fig. 6 is a schematic cross-sectional view of E-E in fig. 3.
Fig. 7 is a schematic structural view of bottom mold lifting.
The labels in the figure are: the method comprises the following steps of 1-a supporting plate, 11-a lifting hook, 12-a guide rail, 13-a first support plate, 14-a second support plate, 15-a protective railing, 16-a foot baffle plate, 2-a sliding device, 3-a Berea beam, 4-a first I-steel, 5-a second I-steel, 6-a bottom die, 7-a main arch, 71-a cushion block, 72-a lifting rib, 8-a first lifting device, 9-a second lifting device and 10-a third lifting device.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1 to 6, the invention provides an installation platform for an arch bridge outer concrete bottom die, which comprises a support plate 1, wherein a lifting hook 11 for lifting a cableway is arranged on the support plate 1;
in this mounting platform, specific structural style between lifting hook 11 and the backup pad 1 is not limited, the specific position of arranging of lifting hook 11 is not limited and the specific quantity of lifting hook 11 is not limited, for the in-process of lifting by crane backup pad 1 can keep the stationarity of backup pad 1 for being convenient for, and then can improve the security in the work progress, can adopt following preferred mode: as shown in fig. 1, a first support plate 13 is fixed to one side of a support plate 1, a second support plate 14 is fixed to the other side of the support plate, the first support plate 13 and the second support plate 14 are arranged to face each other, and a hook 11 is fixed to the first support plate 13 and the second support plate 14, respectively. As shown in fig. 1 and 2, the number of the hooks 11 on the first supporting plate 13 is two, and the hooks are distributed at two ends of the first supporting plate 13; the number of the hooks 11 on the second plate 14 is two, and the positions of the hooks 11 on the second plate 14 are arranged corresponding to the positions of the hooks 11 on the first plate 13. Of course, the number of the hooks 11 is not limited, and is generally selected according to actual conditions.
Further, the specific structure of the first supporting plate 13 and the second supporting plate 14 is not limited, and the specific connection mode among the supporting plate 1, the first supporting plate 13 and the second supporting plate 14 is not limited, in order to facilitate the assembly and disassembly of the installation platform, the following modes can be adopted: the first support plate 13 and the second support plate 14 are both truss members, so that the first support plate 13 and the second support plate 14 are connected through the Bailey beam 3, and the support plate 1 is fixedly arranged at the upper end of the Bailey beam 3. The first support plate 13 and the second support plate 14 are truss members, so that the first support plate 13 and the second support plate 14 of the mounting platform can be reused, and the manufacturing cost of the mounting platform can be saved; moreover, the first support plate 13 and the second support plate 14 are truss members, and the first support plate 13 and the second support plate 14 are connected through the Bailey beam 3, so that the mounting platform is convenient to mount and dismount, the overall weight of the mounting platform can be reduced, and the safety in the construction process can be improved.
Specifically, as shown in fig. 2, the truss member may adopt double-spliced channel steel as the main rods, and the upper and lower main rods are connected by first i-steel 4, the double-spliced channel steel may be selected as a 32 # double-spliced channel steel, and the first i-steel 4 may be selected as a 25 # i-steel. To increase the structural strength of the beret beam 3 and to increase the stability of the beret beam 3, as shown in fig. 1, the upper and lower layers of the beret beam 3 may be provided as a scissor-bracing structure.
In the mounting platform, the first support plate 13 and the second support plate 14 are connected by the bery beams 3, the specific number of the bery beams 3 is not limited, and is generally selected according to actual requirements, for implementation, as shown in fig. 4 and 5, five bery beams 3 are arranged between the first support plate 13 and the second support plate 14, and the five bery beams 3 are arranged in parallel with each other. The supporting plate 1 of the installation platform is arranged on the Bailey beam 3, the Bailey beam 3 is arranged between the first supporting plate 13 and the second supporting plate 14 at intervals, in order to enable the whole body of the supporting plate 1 to keep enough strength, at least two second I-shaped steels 5 are fixedly arranged between the Bailey beam 3 and the supporting plate 1 of the installation platform, and all the second I-shaped steels 5 are arranged on the Bailey beam 3 at intervals. The second i-beam 5 may be perpendicular to the bailey beam 3, or may form an included angle with the bailey beam 3, and in fig. 4, the second i-beam 5 is perpendicular to the bailey beam 3. Specifically, the second i-beam 5 may be selected to be a 14-gauge i-beam.
As shown in fig. 4 and 5, a guide rail 12 is fixedly arranged on the upper surface of the support plate 1 of the installation platform, a sliding device 2 is slidably fitted on the guide rail 12, and the sliding device 2 is used for driving the bottom die 6 to move on the guide rail 12.
Specifically, the specific structure of the support plate 1 of the present mounting platform is not limited, and may be circular, rectangular, trapezoidal, etc., and for implementation, the structure of the support plate 1 may be rectangular. As shown in fig. 4, the guide rails 12 may be provided in two in number and arranged in parallel on the support plate 1; the arrangement direction of the guide rail 12 on the support plate 1 is not limited, and is generally selected according to actual conditions, and for implementation convenience, in fig. 4, the arrangement direction of the guide rail 12 is respectively parallel to the plane of the first support plate 13 and the plane of the second support plate 14; and in the view shown in fig. 4, the arrangement direction of the guide rail 12 is perpendicular to the beret beam 3, and the arrangement direction of the guide rail 12 is parallel to the second i-beam 5. The sliding device 2 drives the bottom die 6 to move on the guide rail 12, specifically, the sliding device 2 can be selected as a trolley, and the bottom die 6 is carried by the trolley to move on the guide rail 12.
After the installation platform is lifted to the lower side of the main arch 7 through the main cableway, the specific arrangement direction of the guide rails 12 on the support plate 1 is not limited, preferably, after the bottom die 6 is moved to the position under the main arch 7, the bottom die 6 is made to be close to the position under the corresponding installation section on the main arch 7 as much as possible, and then the installation efficiency of the bottom die 6 can be further improved by matching with a lifting device, the construction period for installing the bottom die 6 can be shortened, and the construction difficulty for installing the bottom die 6 is reduced. For implementation, as shown in fig. 4, the guide rails 12 may be linear guide rails, and after the bottom mold 6 is lifted by the working ropeway onto the sliding device 2, the sliding device 2 may drive the bottom mold 6 to move on the guide rails 12 in a direction perpendicular to the span direction of the main arch 7, so as to facilitate the operation of a worker when installing the bottom mold 6 and to facilitate moving the bottom mold 6 to a position right below the main arch 7. Of course, the guide rails 12 may also be arranged along the span direction of the main arch 7, so that the bottom mold 6 may be moved along the span direction of the main arch 7 under the action of the sliding device 2, thereby facilitating the movement of the bottom mold 6 to a position right below the corresponding installation section on the main arch 7. Further, the guide rails 12 may be selected to be arc-shaped guide rails 12, so that after the bottom mold 6 is positioned right under the main arch 7, the position of the bottom mold 6 on the support plate 1 can be adjusted so that the bottom mold 6 is positioned as close as possible to the position right under the corresponding segment of the main arch 7.
Further, in order to improve the safety of the worker during the operation on the installation platform and prevent the devices on the support plate 1 from falling, as shown in fig. 1 and 3, a guard rail 15 is installed on the upper surface of the support plate 1, and a foot plate 16 for preventing the devices on the support plate 1 from falling is arranged around the upper surface of the support plate 1. Specifically, the toe board 16 may be selected to be a rectangular-structured wooden board.
In the installation platform, the specific arrangement mode of the protective railings 15 is not limited, and for implementation convenience, the protective railings can be arranged along the circumferential direction of the supporting plate 1 and form an annular structure in parallel, so that a working area is defined, and workers can carry out construction in the working area; of course, the ring structure described herein may be a closed ring structure, or a ring structure with a certain gap, and the enclosed working area is not necessarily a regular circle, but may also be a rectangle or other shapes.
In order to reduce the usage amount of the guard rail 15 and further save the manufacturing cost of the installation platform, as shown in fig. 1, in the installation platform, the top surface of the first supporting plate 13 and the top surface of the second supporting plate 14 are both higher than the top surface of the supporting plate 1, the guard rail 15 is arranged along the circumferential direction of the supporting plate 1, and the guard rail 15, the first supporting plate 13 and the second supporting plate 14 together form an annular structure. Therefore, the part of the first support plate 13 higher than the support plate 1 and the part of the second support plate 14 higher than the support plate 1 can protect workers, so that the use amount of the guard rail 15 can be reduced, and the manufacturing cost of the installation platform can be saved; of course, the ring structure described herein may be a closed ring structure, or a ring structure with a certain gap, and the enclosed working area is not necessarily a regular circle, but may also be a rectangle or other shapes.
In the mounting platform provided by the invention, the supporting plate 1 is provided with the lifting hook 11, so that the mounting platform is conveniently lifted to the lower part of the main arch 7 by the main cableway, and the bottom die 6 is conveniently mounted subsequently; in this mounting platform, be provided with guide rail 12 on the backup pad 1, the adaptation has slider 2 on guide rail 12 to after the die block 6 is lifted to slider 2 at the working cableway, slider 2 can drive die block 6 and remove on guide rail 12, and then after backup pad 1 is lifted to the below of main arch 7, can move die block 6 to under the main arch 7 through slider 2, and cooperate hoisting accessory again, install the corresponding installation segment on main arch 7 with die block 6. The bottom die 6 can be moved to the position under the main arch 7 through the sliding device 2 of the installation platform, so that the bottom die 6 does not need to be moved to the position under the main arch 7 through the cooperation of the main cableway and the working cableway at the same time, the installation efficiency of the bottom die 6 can be improved by workers through the installation platform, the construction period of installation of the bottom die 6 is shortened, and the construction difficulty of the bottom die 6 is reduced.
Example 2
The invention provides an installation system, which comprises a main arch 7, a main cableway and a working cableway, and also comprises a hoisting device and the installation platform for the bottom die of the concrete wrapped outside the arch bridge as claimed in any one of claims 1 to 6, wherein the main cableway can hoist the installation platform to the position below the main arch 7, the working cableway can hoist the bottom die 6 to the installation platform, and a sliding device 2 can move the bottom die 6 to the position right below the main arch 7; the hoisting device is used for hoisting the bottom die 6 to the installation position of the corresponding installation segment on the main arch 7.
In the installation system, the installation platform is lifted to the position below the main arch 7 through the main cableway, so that the bottom die 6 can be conveniently installed subsequently; after the bottom die 6 is lifted to the sliding device 2 by the working cableway, the sliding device 2 drives the bottom die 6 to move on the guide rail 12, and the bottom die 6 is moved to the position right below the main arch 7; then, the bottom die 6 is lifted at the installation position of the corresponding installation segment on the main arch 7 by matching with a lifting device, and finally, the bottom die 6 is installed. In this installation system, the displacement device 2 of mounting platform can move the die block 6 to under the main arch 7 to can not need to be moved the die block 6 to under the main arch 7 by main cableway and working cableway cooperation simultaneously, then cooperate the hoisting device again to hoist the die block 6 behind the installation position of corresponding installation segment on the main arch 7, install the die block 6 again, thereby can improve the installation effectiveness to die block 6, can shorten the construction period of die block 6 installation, and can reduce the construction degree of difficulty of die block 6 installation.
Further, in order to ensure the stability of the bottom die 6 in the lifting process, the lifting efficiency of the bottom die 6 can be improved, and the installation efficiency of the bottom die 6 is further improved. In this mounting system, the hoisting device includes the first hoisting device 8 mounted on the main arch 7 and the second hoisting device 9 mounted on the mounting platform, and the mounting time of the hoisting device is not limited, and the hoisting device can be mounted on the mounting platform by hoisting, or can be mounted on the bottom die 6 by hoisting, as long as the hoisting device is mounted before S3. Of course, the installation time of the first hoisting device 8 and the second hoisting device 9 in the hoisting device can be the same or different, and generally selected according to the actual situation.
The first lifting device 8 and the second lifting device 9 are respectively positioned at two ends of the bottom die 6, specifically, the first lifting device 8 can be selected as an electric hoist and is arranged at a position of the bottom die 6 close to the arch foot end; the second lifting device 9, which may be chosen as a winch, is mounted on the bottom mould 6 near the arch top. In the installation system, the number of the first hoisting devices 8 is two, the first hoisting devices are respectively positioned on the left and right sides of the main arch 7, and the first hoisting devices 8 on the left and right sides are correspondingly arranged; the number of the second hoisting devices 9 is two, and the two second hoisting devices 9 are respectively positioned on the left and right sides of the main arch 7, and the left and right second hoisting devices 9 are correspondingly arranged. Furthermore, in the installation system, the electric hoist, the winch and the sliding device 2 are matched, so that the installation efficiency of the bottom die 6 can be improved, and the construction difficulty of the bottom die 6 can be reduced.
As shown in fig. 7, in the present mounting system, the lifting means further comprise a third lifting means 10, the third lifting means 10 being located on the mounting platform and being used for adjusting the position of the bottom mould 6 during lifting. Specifically, third hoisting accessory 10 can select to be hand hoist to through hand hoist, can adjust the position of die block 6 in the lift process, can guarantee that die block 6 is promoted and corresponds the mounted position department of erection segment on main arch 7, and then can further improve the installation effectiveness of die block 6 through this mounting system, shorten the construction cycle of die block 6, and can reduce the construction degree of difficulty of die block 6.
Example 3
The invention also provides a construction method, which is suitable for installing the bottom formwork 6 of the outer concrete of the arch bridge, and based on the installation system of the embodiment 2, the construction method comprises the following steps:
s1, hoisting the mounting platform to the lower part of the main arch 7 through the main cableway;
s2, hoisting the assembled bottom die 6 to the sliding device 2 of the mounting platform through the working cableway, and moving the bottom die 6 to the position right below the main arch 7 through the sliding device 2;
preferably, the skid 2 can move the bottom mold 6 directly under the main arch 7 in a direction perpendicular to the span direction of the main arch 7.
S3, lifting the bottom die 6 to the mounting position of the corresponding mounting segment on the main arch 7 through the lifting device, and mounting the cushion block 71 at the corresponding mounting segment on the main arch 7 to enable the bottom die 6 to be tightly attached to the cushion block 71;
preferably, the hoisting device comprises a first hoisting device 8, a second hoisting device 9 and a third hoisting device 10, wherein the first hoisting device 8 is selected to be an electric hoist and is installed at the position, close to the arch foot end, of the bottom die 6, the second hoisting device 9 is selected to be a winch and is installed at the position, close to the arch top end, of the bottom die 6, and the third hoisting device 10 is selected to be a hand hoist and is installed on the installation platform. Through electric block, hoist engine and the cooperation of displacement means 2, can improve the installation effectiveness to die block 6, reduce the construction degree of difficulty of die block 6, can adjust the position of die block 6 in the promotion in-process through hand block, and then can guarantee that die block 6 is promoted and corresponds the mounted position department of erection segment on main arch 7 to can further improve the installation effectiveness of die block 6, shorten the construction cycle of die block 6, and can reduce the construction degree of difficulty of die block 6.
S4, enabling the hanging rib 72 to penetrate through the inner side of the bottom die 6, locking a gasket at the bottom side of the bottom die 6, and welding at the contact part of the hanging rib 72 and the main chord pipe of the main arch 7; in the construction method, the hanging ribs 72 are used for fixing the bottom mold 6 and the main arch 7, and specifically, the hanging ribs 72 can be selected to be U-shaped hanging ribs; when welding between the hanger bar 72 and the main chord tube of the main arch 7, the height of the weld length is generally selected according to the actual situation.
Specifically, taking a certain big river as an example, the maximum inclination angle of the main arch 7 of the big river is 49 degrees, and the double-spliced channel steel on the support plate 1, the first support plate 13 and the double-spliced channel steel on the second support plate 14 are all made of Q345 steel. When the hanging rib 72 and the main chord pipe are welded, the length of the welding line is not less than 120mm, and the height of the welding line is not less than 8 mm.
When the height of the welding line is 8mm, the length of the welding line is 120mm through double-side welding, the most dangerous installation segment is checked and calculated to be an arch ring segment with an inclination angle of 47 degrees, and the method specifically comprises the following steps:
the weight of the concrete which is normally received by the bottom die 6 is G ═ A x gammaC*cos(47°)
Wherein:
a-calculating the cross-sectional area (m) of the arch segment2)；
γCGravity Density of concrete (kN/m)3)；
The cross-sectional area of the upper bottom mould 6 of the main arch 7 of the river when concrete is poured is 5.9128m2The gravity density of the concrete is 26.5kN/m3Therefore, the weight of the concrete applied to the bottom mold 6 in the normal direction is 5.9128 × 26.5 × cos (47 °) 106.8617 kN.
When the arch ring concrete is poured, pouring is carried out according to the speed of 1m/h, the initial setting time of the concrete is 7h, and therefore the surface load received by the arch ring bottom die 6 in the normal direction is as follows:
Fnormal direction＝F*4*1＝56.3178*4＝225.271kN
In the formula:
f-maximum lateral pressure of newly poured concrete to form (kNm)2)；
γCGravity Density of concrete (kN/m)3)；
V, the pouring speed (m/h) of concrete;
t-initial setting time (h) of newly cast concrete;
β1-additive impact correction factor; when the admixture is not mixed, the admixture is taken as 1.0, and when the admixture with the retarding function is mixed, the admixture is taken as 1.2; in the great river bridge, beta1Take 1.2.
β2And-concrete slump influence correction coefficient. When the slump is less than 30mm, taking 0.85; taking 1.00 when the slump is 50-90 mm; taking 1.15 when the slump is 110-150 mm; in the great river bridge, beta2Take 1.15.
When the stress of the hanging ribs 72 is checked, the stress of the three hanging ribs 72 is considered, so that:
Fgeneral assembly＝(G+FNormal direction)/3＝(106.8617+225.271)/3＝110.7109kN
in the formula, h is less than or equal to 1.5mm when the gap between two weldmentseH is 0.7 x h, when the clearance between the two welding parts is less than 5mm and the clearance between the two welding parts is more than or equal to 1.5mmeH. Therefore, the stress requirement is met when the length of the welding line is 120mm and the height of the welding line is 8mm, and when the length of the welding line is 120mm and the height of the welding line is 8mm, the calculated result is close to the theoretical threshold value, so that the length of the welding line is not less than 120mm, and the height of the welding line is not less than 8 mm.
The mold 6 after welding is inspected, and the mold 6 of the next installation segment of the main arch 7 is installed after the inspection is passed. When the bottom die 6 is inspected, it should be inspected whether the bottom die 6 is installed right in the middle of the installation section corresponding to the main arch 7, whether the vertical distance between the bottom die 6 and the lower chord tube of the main arch 7 meets the design requirement, whether the length, height and fullness of the welding seam between the hanging rib 72 and the lower chord tube meet the stress requirement of each section, whether the bolts at the bottom side of the bottom die 6 are screwed, whether the bottom die 6 is complete and has no damage, and the like.
According to the construction method provided by the invention, through the matching of the hoisting device and the sliding device 2, the installation efficiency of the bottom die 6 can be improved, the construction period of the installation of the bottom die 6 can be shortened, and the construction difficulty of the installation of the bottom die 6 can be reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A mounting platform for arched bridge outsourcing concrete die block, its characterized in that: the device comprises a supporting plate (1), wherein a lifting hook (11) for hoisting a cableway is arranged on the supporting plate (1), a guide rail (12) is fixedly arranged on the upper surface of the supporting plate (1), a sliding device (2) is slidably matched on the guide rail (12), and the sliding device (2) is used for driving a bottom die (6) to move on the guide rail (12).
2. The mounting platform for the bottom formwork of the outer covering concrete of the arch bridge, according to claim 1, is characterized in that: one side of the supporting plate (1) is fixedly provided with a first supporting plate (13), the other side of the supporting plate is fixedly provided with a second supporting plate (14), the first supporting plate (13) and the second supporting plate (14) are oppositely arranged, and the lifting hook (11) is fixedly arranged on the first supporting plate (13) and the second supporting plate (14) respectively.
3. The mounting platform for the bottom formwork of the outer covering concrete of the arch bridge, according to claim 2, is characterized in that: the first support plate (13) and the second support plate (14) are truss members, the first support plate (13) and the second support plate (14) are connected through the Bailey beam (3), and the support plate (1) is fixedly arranged at the upper end of the Bailey beam (3).
4. The mounting platform for the bottom formwork of the outer covering concrete of the arch bridge, according to claim 3, is characterized in that: the truss component adopts double-spliced channel steel as main rods, and the upper main rod and the lower main rod are connected by adopting a first I-shaped steel (4); the upper layer and the lower layer of the Bailey beam (3) are of a cross-bracing structure.
5. The mounting platform for the bottom formwork of the outer covering concrete of the arch bridge, according to claim 3, is characterized in that: at least two second I-beams (5) are fixedly arranged between the Bailey beam (3) and the support plate (1), and all the second I-beams (5) are arranged on the Bailey beam (3) at intervals.
6. The installation platform for the bottom formwork of the outer covering concrete of the arch bridge according to any one of claims 1 to 5, wherein: the upper surface of the supporting plate (1) is provided with a protective railing (15), and the periphery of the upper surface of the supporting plate (1) is provided with a foot baffle plate (16) for preventing devices on the supporting plate (1) from falling;
the top surface of the first support plate (13) and the top surface of the second support plate (14) are higher than the top surface of the support plate (1), the protective handrail (15) is arranged along the circumferential direction of the support plate (1), and the protective handrail (15), the first support plate (13) and the second support plate (14) jointly form an annular structure.
7. Installation system, including main arch (7), main cableway and working cableway, its characterized in that: further comprising a lifting device and a mounting platform for an arch bridge outer concrete bottom mould according to any one of claims 1 to 6,
the mounting platform can be hoisted to the position below the main arch (7) by the main cableway, the bottom die (6) can be hoisted to the mounting platform by the working cableway, and the bottom die (6) can be moved to the position right below the main arch (7) by the sliding device (2);
the lifting device is used for lifting the bottom die (6) to the mounting position of the corresponding mounting segment on the main arch (7).
8. The mounting system of claim 7, wherein: the lifting device comprises a first lifting device (8) arranged on the main arch (7) and an upper second lifting device (9) arranged on the mounting platform, and the first lifting device (8) and the second lifting device (9) are respectively positioned at two ends of the bottom die (6).
9. The mounting system of claim 7 or 8, wherein: the lifting device comprises a third lifting device (10), and the third lifting device (10) is located on the mounting platform and used for adjusting the position of the bottom die (6) in the lifting process.
10. The construction method is suitable for mounting the concrete bottom die wrapped outside the arch bridge, and is characterized in that: mounting system according to any one of claims 7 to 9, comprising the following steps,
s1, hoisting the mounting platform to the lower part of the main arch (7);
s2, hoisting the assembled bottom die (6) to a sliding device (2) of the mounting platform, and moving the bottom die (6) to the position right below the main arch (7) through the sliding device (2);
s3, lifting the bottom die (6) to the mounting position of the corresponding mounting segment on the main arch (7) through the lifting device, mounting a cushion block (71) on the corresponding mounting segment of the main arch (7), and enabling the bottom die (6) to be tightly attached to the cushion block (71);
and S4, the hanging rib (72) penetrates through the inner side of the bottom die (6), the gasket is locked at the bottom side of the bottom die (6), and the contact part of the hanging rib (72) and the main chord pipe of the main arch (7) is welded.
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| CN202011044124.1A CN112376427B (en) | 2020-09-28 | 2020-09-28 | Installation platform, system and construction method for arch bridge outer concrete bottom die |
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Cited By (1)
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| CN112921819A (en) * | 2021-03-04 | 2021-06-08 | 广西路桥工程集团有限公司 | Safe operation platform system used in construction process of double-flying-wing arch bridge |
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| CN202626841U (en) * | 2012-06-12 | 2012-12-26 | 四川公路桥梁建设集团有限公司 | Device for concrete surrounding of main arch by using hanging method |
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