An arch bridge concrete outer package construction platform system and construction method

Abstract

The present invention relates to a construction platform system and a construction method for the external concrete of an arch bridge. The construction platform system includes a bottom slab construction platform, a web construction platform, and a top slab construction platform. In the present invention, the bottom slab construction platform is arranged along the entire bridge of the main arch without turnover, and is used for the construction of the bottom slab, web, and top slab. The web construction platform is used in a turnover manner for the construction of the web and top slab. The top slab construction platform is used in a turnover manner for the construction of the top slab. With the cooperation of a hoisting device, the steel bar binding and formwork installation of each part can be conveniently carried out. The bottom formwork of the bottom slab and the lower chord passage are pre-installed along with the arch rib segments, solving the problem of the initial layout of the construction platform on the inclined surface. The problems of material transfer in narrow spaces are solved through the lower chord passage, construction passage, upper chord passage, and top slab passage. The construction platform system reduces the construction difficulty and safety risks of high-altitude operations, improves the construction efficiency, and at the same time has a high turnover utilization rate of the construction platform and saves materials.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, in particular to a construction platform system and construction method for the outer - wrapped concrete of an arch bridge. Background Technique

[0002] For a concrete - filled steel - tubular arch bridge, after the installation of the steel - tubular arch rib and the pouring of the concrete inside the tube, the outer - wrapped concrete of the arch rib is then carried out. Usually, the construction of the outer - wrapped concrete adopts the method of dividing into rings and segments, and is constructed in the order of the bottom - plate ring, the web - plate ring, and the top - plate ring.

[0003] In order to realize the construction of the bottom - plate ring, the web - plate ring, and the top - plate ring at high altitude, the overall consideration and design of the construction platform for the outer - wrapped concrete are required. First, for the overall consideration of the platform, the platform design should not only consider the construction requirements of a single ring or a single point, but should try to meet the construction of each point, otherwise it is uneconomical. Second, the platform is required to be safe and reliable, easy to operate, and solve the problems of the narrow space inside the box, the installation of formwork, the turnover of materials, and the inclination of the working surface. Summary of the Invention

[0004] The purpose of the present invention is to provide a construction platform system and construction method for the outer - wrapped concrete of an arch bridge in view of the problems existing in the prior art.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present invention is as follows:

[0006] In the first aspect, the present invention provides a construction platform system for the outer - wrapped concrete of an arch bridge, including:

[0007] A bottom - plate construction platform, including a bottom - plate bottom form and a lower - chord passage. The bottom - plate bottom form is connected to the lower - chord member through a connecting piece during the pre - fabrication of the arch - rib segment in the factory. The bottom - plate bottom form is hoisted and spliced with the arch - rib segment. Construction passages extend out from both sides of the bottom - plate bottom form beyond the lower - chord member. The lower - chord passage is laid along the arch rib and is connected to the lower - chord horizontal bracing rod. The bottom - plate side form is arranged through the construction passage, and the bottom - plate inner form is arranged through the lower - chord passage. The bottom - plate bottom form, the bottom - plate side form, and the bottom - plate inner form enclose a bottom - plate pouring area;

[0008] A web - plate construction platform, including a suspension support, a hanging bracket, and an inner - form scaffold. The suspension support is connected to the upper - chord member. The hanging bracket is connected to the suspension support and is located outside the steel - tubular arch rib. The inner - form scaffold is arranged on the bottom - plate. The web - plate outer form is arranged through the hanging bracket, and the web - plate inner form is arranged through the inner - form scaffold. The web - plate outer form, the top of the bottom - plate, and the web - plate inner form enclose a web - plate pouring area;

[0009] The top plate construction platform includes an upper chord passage and a top plate passage. The upper chord passage is laid along the arch rib and connected to the upper chord horizontal connecting rod. The side formwork of the top plate is set through the hanging bracket, the top formwork of the top plate is set through the upper chord passage, the inner formwork of the top plate is suspended through the top formwork of the top plate, and the top plate passage is suspended through the inner formwork of the top plate. The inner formwork of the top plate, the top of the web, the side formwork of the top plate, and the top formwork of the top plate enclose a top plate pouring area.

[0010] Adopting the arch bridge external concrete construction platform system of the present invention, the bottom plate construction platform is arranged along the whole bridge of the main arch without turnover and is used for the construction of the bottom plate, web, and top plate. The web construction platform is used for the construction of the web and top plate after being recycled, and the top plate construction platform is used for the construction of the top plate after being recycled. With the cooperation of the hoisting equipment, the lower chord passage, the construction passage, the suspension bracket, the hanging bracket, the inner formwork scaffold, the upper chord passage, and the top plate passage, the steel bar binding and formwork installation of each part can be conveniently carried out. The bottom formwork of the bottom plate and the lower chord passage are pre-installed along with the arch rib segments, solving the problem of the initial layout of the construction platform on the inclined plane. The problems of material transfer in narrow spaces are solved through the lower chord passage, the construction passage, the upper chord passage, and the top plate passage. The construction platform system reduces the construction difficulty and safety risks of high-altitude operations, improves the construction efficiency, and at the same time has a high turnover utilization rate of the construction platform and saves materials.

[0011] As a preferred technical solution of the present invention, the bottom formwork of the bottom plate between adjacent arch rib segments is connected through a filling section.

[0012] As a preferred technical solution of the present invention, the connecting member is a U-shaped pull rod. The U-shaped groove of the U-shaped pull rod is fitted to the top of the lower chord rod, and the straight edge of the U-shaped pull rod is bolted to the bottom formwork of the bottom plate.

[0013] As a preferred technical solution of the present invention, the lower chord passage and the upper chord passage are connected through a vertically arranged connecting passage.

[0014] As a preferred technical solution of the present invention, the lower chord passage includes two rows of angle steels laid along the arch rib. A number of steel bars are spaced between the two rows of angle steels, and steel jump boards are laid between the angle steels, and triangular timbers are spaced on the steel jump boards.

[0015] As a preferred technical solution of the present invention, the suspension bracket includes a distribution beam, a connecting beam, and a movable lifting lug. The distribution beam is detachably connected to the precast support on the top of the upper chord rod. A number of pairs of the distribution beams are respectively arranged on a pair of upper chord rods correspondingly. Each pair of the distribution beams is connected through the connecting beam. The movable lifting lug is slidably arranged on the distribution beam, and the movable lifting lug is connected to the hanging bracket.

[0016] As a preferred technical solution of the present invention, at the cross brace of the arch rib, the hanging bracket is not provided, and an inner scaffold is provided. The bottom of the inner scaffold is connected to the construction passage, the top is connected to the cross brace, and the middle part is connected to the stiffening skeleton and / or the bottom plate through wall-attached members.

[0017] As a further preferred technical solution of the present invention, embedded ducts are provided during the casting of the bottom plate, and the wall-attached members pass through the embedded ducts to connect the bottom plate.

[0018] As a preferred technical solution of the present invention, the bottom plate and the top plate have the same shape and specifications. The inner formwork of the top plate is directly inverted by flipping the inner formwork of the bottom plate, and the side formwork of the top plate is directly inverted by flipping the side formwork of the bottom plate.

[0019] In a second aspect, the present invention also provides a construction method for the concrete outer package of an arch bridge, using the arch bridge concrete outer package construction platform system described in any one of the above. The method includes the following steps:

[0020] S1. When fabricating the arch rib segments, the bottom plate construction platform is pre-assembled on the ground and connected to the arch rib segments, and they are hoisted together with the arch rib segments.

[0021] S2. Bind the steel bars using the bottom formwork of the bottom plate, set the side formwork of the bottom plate using the construction passage, set the inner formwork of the bottom plate using the lower chord passage. The bottom formwork of the bottom plate, the side formwork of the bottom plate, and the inner formwork of the bottom plate are closed, and the bottom plate is cast on the bottom plate construction platform to form a circular casting of the bottom plate.

[0022] S3. After the circular casting of the bottom plate is formed, install the suspension bracket and the hanging bracket using a hoisting device, build the inner formwork scaffold on the bottom plate, bind the steel bars using the hanging bracket and the inner formwork scaffold, set the outer formwork of the web using the hoisting device and the hanging bracket, set the inner formwork of the web using the hoisting device and the inner formwork scaffold. The outer formwork of the web and the inner formwork of the web are closed, and the web is cast on the web construction platform. After completing one arch rib segment, use the hoisting device to turnover the suspension bracket, the hanging bracket, the inner formwork scaffold, the outer formwork of the web, and the inner formwork of the web to cast the web of the next arch rib segment, and so on to complete the circular casting of the web.

[0023] S4. After the web ring is formed, use the hoisting equipment to transfer the suspension bracket and the hanging bracket, use the hoisting equipment and the upper chord channel to set the top formwork of the top plate, use the hoisting equipment and the hanging bracket to set the side formwork of the top plate, use the hoisting equipment and the top formwork of the top plate to set the inner formwork of the top plate, use the inner formwork of the top plate to set the top plate channel, and close the inner formwork of the top plate, the side formwork of the top plate, and the top formwork of the top plate, and pour the top plate on the top plate construction platform; after completing one arch rib segment, use the hoisting equipment to transfer the suspension bracket, the hanging bracket, the top formwork of the top plate, the side formwork of the top plate, the inner formwork of the top plate, and the top plate channel to pour the top plate of the next arch rib segment, and cycle in this way to complete the pouring and forming of the top plate ring.

[0024] Adopt the construction method of the concrete outside the arch bridge of the present invention. The bottom plate construction platform is arranged along the whole bridge of the main arch and is not transferred, and is used for the construction of the bottom plate, the web and the top plate. The web construction platform is transferred and used for the construction of the web and the top plate. The top plate construction platform is transferred and used for the construction of the top plate. Through the hoisting equipment cooperating with the lower chord channel, the construction channel, the suspension bracket, the hanging bracket, the inner formwork scaffold, the upper chord channel and the top plate channel, the steel bar binding and formwork installation of each part can be conveniently carried out. The bottom formwork of the bottom plate and the lower chord channel are pre-installed with the arch rib segment, which solves the problem of the initial layout of the construction platform on the inclined surface. The material transfer problem in the narrow space is solved through the lower chord channel, the construction channel, the upper chord channel and the top plate channel. This construction method reduces the construction difficulty and safety risk of high-altitude operations, improves the construction efficiency, and at the same time has a high turnover utilization rate of the construction platform and saves materials.

[0025] To sum up, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0026] The concrete outside the arch bridge construction platform system and construction method of the present invention. The bottom plate construction platform is arranged along the whole bridge of the main arch and is not transferred, and is used for the construction of the bottom plate, the web and the top plate. The web construction platform is transferred and used for the construction of the web and the top plate. The top plate construction platform is transferred and used for the construction of the top plate. Through the hoisting equipment cooperating with the lower chord channel, the construction channel, the suspension bracket, the hanging bracket, the inner formwork scaffold, the upper chord channel and the top plate channel, the steel bar binding and formwork installation of each part can be conveniently carried out. The bottom formwork of the bottom plate and the lower chord channel are pre-installed with the arch rib segment, which solves the problem of the initial layout of the construction platform on the inclined surface. The material transfer problem in the narrow space is solved through the lower chord channel, the construction channel, the upper chord channel and the top plate channel. This construction platform system reduces the construction difficulty and safety risk of high-altitude operations, improves the construction efficiency, and at the same time has a high turnover utilization rate of the construction platform and saves materials. Description of the Drawings

[0027] Figure 1 It is a structural schematic diagram of the bottom plate construction platform;

[0028] Figure 2 is Figure 1 the A-A sectional view in

[0029] Figure 3 the schematic plan view of the lower chord channel layout;

[0030] Figure 4 is Figure 3 the B-B sectional view in

[0031] Figure 5 the schematic structural view of the lower chord channel;

[0032] Figure 6 is Figure 5 the C-C sectional view in

[0033] Figure 7 the schematic structural view of the web construction platform;

[0034] Figure 8 the schematic structural view of the web construction platform at the cross brace;

[0035] Figure 9 the schematic structural view of the top plate construction platform;

[0036] Figure 10 is Figure 9 the D-D sectional view in

[0037] Markings in the figure: 01 - upper chord rod, 02 - lower chord rod, 03 - stiffening skeleton, 04 - bottom plate, 05 - web, 06 - top plate, 1 - bottom plate bottom formwork, 2 - patch segment, 3 - U-shaped tie rod, 4 - construction channel, 5 - railing, 6 - bottom plate side formwork, 7 - bottom plate inner formwork, 8 - upper chord channel, 9 - lower chord channel, 10 - connecting channel, 11 - lower chord horizontal connecting rod, 12 - angle steel, 13 - steel bar, 14 - steel gangplank, 15 - triangular wood, 16 - distribution beam, 17 - connecting beam, 18 - movable lifting lug, 19 - hanging bracket, 20 - inner formwork scaffolding, 21 - web outer formwork, 22 - web inner formwork, 23 - cross brace, 24 - inner side scaffolding, 25 - wall attachment, 26 - embedded duct, 27 - top plate side formwork, 28 - top plate inner formwork, 29 - top plate channel, 30 - top plate top formwork, 31 - pump pipe. Detailed implementation manners

[0038] The present invention will be described in detail below with reference to the accompanying drawings.

[0039] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] Embodiment 1

[0041] As Figures 1 to 10 shown, a concrete construction platform system for the outer package of an arch bridge according to the present invention includes a bottom plate construction platform, a web construction platform, and a top plate construction platform.

[0042] As Figure 1 and Figure 2 shown, the bottom plate construction platform includes a bottom plate formwork 1, and the bottom plate formwork 1 is connected to the lower chord 02 through a connecting piece during the prefabrication of the arch rib segment in the factory. Specifically, the connecting piece is a U-shaped pull rod 3, the U-shaped groove of the U-shaped pull rod 3 is fitted to the top of the lower chord 02, and the straight edge of the U-shaped pull rod 3 is bolted to the bottom plate formwork 1; in this embodiment, one U-shaped pull rod 3 is arranged every 1 meter along the length direction of the lower chord 02.

[0043] The bottom plate formwork 1 is hoisted and spliced along with the arch rib segment. Since the arch rib line is a catenary and has an inclination angle, the bottom plate formwork 1 is not fully covered along with the arch rib segment. After the adjacent arch rib segments are connected, there is a gap between the adjacent bottom plate formworks 1. Therefore, the bottom plate formworks 1 between the adjacent arch rib segments are connected through a filling section 2, as Figure 1 shown; the structure of the filling section 2 is exactly the same as that of the bottom plate formwork 1, only the installation sequence is different. The connecting piece is pre-installed on the arch rib segment corresponding to the filling section 2, and after the subsequent arch rib segment is installed in place (the bottom plate formwork 1 is naturally installed in place), the filling section 2 is hoisted and installed through a hoisting device to connect the corresponding connecting piece and penetrate through with the bottom plate formwork 1.

[0044] Specifically, the bottom plate formwork 1 includes bamboo plywood, carpenter beams, and double-channel steel. The double-channel steel serves as the bottom skeleton, on which the carpenter beams are arranged, and the bamboo plywood is laid on the carpenter beams. Among them, the setting ranges of the bamboo plywood and the carpenter beams only need to correspond to the bottom surface of the bottom plate 04 to be poured. The two sides of the double-channel steel respectively extend out of the lower chord 02 to form a construction passage 4, that is, the construction passage 4 is formed on both sides of the bottom plate 04 to be poured. Steel jump boards 14 are fully paved on the construction passage 4, triangular woods 15 are arranged at intervals along the length direction of the construction passage 4, and railings 5 are installed on the side of the construction passage 4.

[0045] As Figure 3 and Figure 4 shown, the bottom plate construction platform further includes a lower chord passage 9, the lower chord passage 9 is laid along the entire length of the arch rib and is connected to the lower chord parallel link 11; specifically, as Figure 5 and Figure 6As shown in the figure, the lower chord channel 9 includes two rows of angle steels 12 laid along the entire length of the arch rib, with a specification of L75×5. A number of steel bars 13 with a specification of φ20 are arranged at intervals between the two rows of angle steels 12. A steel gangplank 14 is laid between the angle steels 12. Triangular timbers 15 are arranged at intervals along the length direction of the steel gangplank 14. Railings 5 are installed on both sides of the lower chord channel 9, and the bottom of the railings 5 is inserted into the lower chord horizontal connecting rod 11.

[0046] As Figure 2 shown in the figure, the bottom formwork on the side of the floor slab 6 is set through the construction channel 4. The bottom formwork on the side of the floor slab 6 is a steel formwork. The bottom formwork inside the floor slab 7 is set through the lower chord channel 9. The bottom formwork inside the floor slab 7 includes bamboo plywood, square timbers and channel steels. The bottom of the channel steel is fixedly connected to the square timber, and the bottom of the square timber is fixedly connected to the bamboo plywood. The bottom formwork 1 of the floor slab, the bottom formwork on the side of the floor slab 6 and the bottom formwork inside the floor slab 7 enclose the pouring area of the floor slab 04. The bottom formwork inside the floor slab 7 and the bottom formwork 1 of the floor slab are connected by tie rods. The bottom formwork inside the floor slab 7 and the bottom formwork on the side of the floor slab 6 are connected by tie rods. The bottom formwork on the side of the floor slab 6 is connected to the lower chord 02 through tie rods. The bottom formworks on the side of the floor slab 6 on both sides are connected by tie rods. The bottom of the bottom formwork on the side of the floor slab 6 is connected to the bottom formwork 1 of the floor slab.

[0047] As Figure 7 shown in the figure, the web construction platform includes a suspension bracket, a suspension frame 19 and an internal formwork scaffolding 20. The suspension bracket is connected to the upper chord 01. The suspension frame 19 is connected to the suspension bracket and is located outside the stiffening skeleton 03. The internal formwork scaffolding 20 is arranged on the floor slab 04. Specifically, the suspension bracket includes a distribution beam 16, a connecting beam 17 and a movable lifting lug 18. The distribution beam 16 is detachably connected to the precast support at the top of the upper chord 01. A number of pairs of the distribution beams 16 are respectively arranged on a pair of upper chords 01. The distribution beams 16 in each pair are connected by the connecting beam 17. The movable lifting lug 18 is slidably arranged on the distribution beam 16, and the movable lifting lug 18 is connected to the suspension frame 19.

[0048] The external formwork 21 of the web is set through the suspension frame 19, and the internal formwork 22 of the web is set through the internal formwork scaffolding 20. The external formwork 21 of the web and the internal formwork 22 of the web are connected by tie rods. The external formwork 21 of the web, the top of the floor slab 04 and the internal formwork 22 of the web enclose the pouring area of the web 05.

[0049] In a specific embodiment, the support is welded to the top of the upper chord 01. The support is a steel pipe, and the support is integrally processed and connected during the processing of the upper chord 01. The distribution beam 16 includes a vertical rod, a horizontal rod, and an inclined rod. The vertical rod, the horizontal rod, and the inclined rod are all made of steel pipes. The vertical rod is inserted into the support and locked by bolts. The bolts sequentially pass through the support wall and the vertical rod wall. One end of the horizontal rod is welded to the body of the vertical rod and projects outside the upper chord. The inclined rod is welded to the vertical rod and the horizontal rod respectively to form a stable triangular truss structure. A stiffening rib is provided at the connection between the vertical rod and the horizontal rod. The stiffening rib is welded to the vertical rod and the horizontal rod respectively to strengthen the stability of the projecting horizontal rod. A pin ear is provided at the top of the vertical rod. The pin ear is hinged to the connecting beam 17. The distribution beam 16 is prefabricated in a factory and directly hoisted and installed on site by a hoisting device.

[0050] The movable lifting ear 18 includes a sleeve. The sleeve is slidably sleeved on the horizontal rod. A lifting plate is connected to the bottom of the sleeve. The sleeve and the lifting plate are both made of steel structures. The lifting plate is welded to the sleeve. A lifting hole is provided on the lifting plate. The movable lifting ear 18 is prefabricated in a factory and directly connected to the horizontal rod and is hoisted together with the distribution beam 16 on site.

[0051] The connecting beam 17 is hoisted by a hoisting device to the middle of a pair of symmetrically arranged distribution beams 16. The connecting beam 17 is connected to the vertical rod through the pin ear. The connecting beam 17 and the pin ear are fixed by bolts. With this structure, the connecting beam 17 forms a tie rod to connect a pair of distribution beams 16 and balance the tension of the subsequent hanger 19 on the distribution beam 16.

[0052] Specifically, the hanger 19 includes a plurality of vertical columns and a plurality of horizontal frames. The horizontal frames are arranged in layers and connected by the vertical columns. A plurality of inclined tie rods and side nets are provided on the side of the hanger 19 away from the upper chord 01. The inclined tie rods connect the connection points of the vertical columns and the horizontal frames. The side net covers the entire side of the hanger 19 and connects the vertical columns, the horizontal frames, and the inclined tie rods. A steel jump board 14 is connected to the horizontal frames. A hanging ear is provided at the top of the hanger 19. The hanging ear is hinged to the lifting hole by a bolt. All layers of the horizontal frames are connected by a ladder. A manhole is provided on the middle layer of the horizontal frames. The ladder passes through the manhole. Among them, the vertical columns, the horizontal frames, the inclined tie rods, the ladder, and the jump board are all made of steel structures. The vertical columns, the horizontal frames, and the inclined tie rods are detachably connected by node joints. The side net is a wire mesh or a nylon rope net.

[0053] The hanger 19 is prefabricated in the factory and directly hoisted and installed on site by hoisting equipment. The longitudinal length of a single hanger 19 is 4m, the width of the hanger 19 is 0.8m, and the height can be set according to the height of the arch rib section of the working surface. The spacing between the columns is 2m, and the fully paved steel springboard 14 serves as a construction operating platform.

[0054] In a specific embodiment, at least one movable node is slidably connected to the column on the side of the hanger 19, and the corresponding movable nodes on two adjacent hangers 19 are connected by bolts to connect the two adjacent hangers 19 into a whole; the movable node includes a sleeve and an ear plate, the sleeve is slidably connected to the column, the ear plate is welded to the sleeve, and screw holes are provided on the ear plate, and the corresponding ear plates on two adjacent hangers 19 are detachably connected by bolts.

[0055] The hanger 19 can move closer to or farther away from the upper chord 01 through the sliding of the movable lifting lug 18 , and a limiting component is detachably connected to the cross bar, and the limiting component is used to fix the movable lifting lug 18 .

[0056] In a specific embodiment, the limiting component includes a limiting hole and a corresponding limiting screw, and the cross bar is provided with several groups of the limiting holes. The spacing between each group of the limiting holes matches the width of the sliding part of the movable lifting ear 18, and the limiting holes can be connected to the limiting screw to fix the position of the movable lifting ear 18; with this structure, according to the later work station position of the hanger 19, the limiting holes are set in advance on the cross bar, and after the position of the hanger 19 is changed by the lifting equipment and the movable lifting ear 18 slides into place, the limiting screws are connected to the limiting holes on both sides of the movable lifting ear 18 to limit the sliding of the movable lifting ear 18, thereby ensuring that the distance between the hanger 19 and the upper chord 01 remains unchanged when in use.

[0057] In a specific embodiment, the limiting component includes a clamp, and after the movable lifting ear 18 slides into place, the clamp can be detachably connected to the two sides of the corresponding cross bar to fix the position of the movable lifting ear 18 on the cross bar; using this structure, when the hanger 19 needs to be changed at different workstation positions, the hanger 19 is lifted by a lifting equipment, and when the hanger 19 is moved to the workstation, the sliding of the movable lifting ear 18 is limited by arranging the clamp on both sides of the movable lifting ear 18 to ensure that the distance between the hanger 19 and the upper chord 01 remains unchanged during use.

[0058] The above two limiting component structures are both as follows Figure 7Before the installation of the distribution beam 16 shown, the movable lifting lug 18 is fixed at the first working position. After the hanger 19 is hoisted and installed and connected to the movable lifting lug 18, the hanger 19 can be directly in the first working position, and the first working position is close to the upper chord 01.

[0059] As Figure 7 shown, when the hanger 19 is located at the first working position, workers can tie the web 05 steel bars on the hanger 19; after the tying of the web 05 steel bars is completed, the restriction of the limiting component on the movable lifting lug 18 is released, and the hanger 19 is hoisted away from the upper chord 01 by a hoisting device, and the movable lifting lug 18 slides accordingly. The movable lifting lug 18 enters the second working position, and then the position of the movable lifting lug 18 is fixed by the limiting component. The hanger 19 is located at the second working position. At this time, enough space is left between the hanger 19 and the web 05 steel bars to meet the overall hoisting of the web outer form 21, reduce the formwork assembly time, improve the construction efficiency of the external concrete construction, and workers can install the web outer form 21 on the hanger 19 and perform the subsequent pouring of the web.

[0060] Of course, the above-mentioned first working position and second working position are only examples. There are multiple working positions on the distribution beam 16 that are not limited to the first working position and the second working position, corresponding to various spacings between the hanger 19 and the upper chord 01.

[0061] After the construction of the web 05 of the current segment is completed, the distribution beam 16 and the hanger 19 can be transported to the next segment by a hoisting device for continuous construction. In this way, the construction of all segment working faces is completed; for example, taking three hangers 19 as a unit, construction is carried out from the arch seat to the mid-span. After the construction of the hanger 19 on the side close to the arch seat in a unit is completed, it is transported to the mid-span side by a hoisting device and continues to form a unit. The disassembly and assembly of a unit of hangers 19 are controlled by the movable joints.

[0062] As Figure 7 shown, the horizontal steel pipe on the upper part of the internal formwork scaffold 20 is connected to the stiffening skeleton 03.

[0063] As Figure 8As shown, at the cross brace 23 of the arch rib, the hanger 19 cannot be set due to the obstruction of the cross brace 23, so a coupler-type scaffolding is used to set up an inner scaffolding 24, the bottom of the inner scaffolding 24 is connected to the construction channel 4, the top is connected to the cross brace 23, and the middle part is connected to the rigid skeleton 03 and / or the base plate 04 through the wall attachment 25. When the base plate 04 is cast, a pre-buried channel 26 is set, and the wall attachment 25 passes through the pre-buried channel 26 to connect to the base plate 04; specifically, the inner scaffolding 24 adopts double vertical poles, the bottom of which is placed on the cross beam of the base plate bottom formwork 1, and each cross beam is arranged with two vertical poles, the inner pitch of the vertical pole is 1.8m, which meets the construction needs of the workers, and the outer pitch is 0.9m, which meets the safety needs of the workers; because of the The inner scaffolding 24 is higher, and attachments are set at the bottom, middle and top of the poles to meet the requirements of the specifications. At the same time, in order to place the poles on the inclined beams, a steel pipe about 20 cm long is set on the bottom plate, arranged vertically, welded to the beams in advance, and then the poles are inserted into the steel pipe; the web 05 box also contains the inner mold scaffolding 20, and the scaffolding is arranged in three rows vertically. In order to place the columns on the slope, a steel bar is set up on the bottom plate and the columns are inserted into the fixed column feet. Because the space in the box is small, in order to facilitate the transportation of template materials, a 1.8m channel is reserved at the bottom of the scaffolding platform in the box to meet the needs of personnel passage and material transportation; during the construction of the web 05, steel springboards 14 are laid on the inner facade and the scaffolding in the box to meet the needs of personnel standing and walking.

[0064] like Figure 2 、 Figure 4 、 Figure 9 and Figure 10 As shown, the top plate construction platform includes an upper chord channel 8 and a top plate channel 29. The upper chord channel 8 is laid along the entire length of the arch rib and is connected to the upper chord horizontal connecting rod. The top plate side formwork 27 is set through the hanger 19, and the top plate top formwork 30 is set through the upper chord channel 8. The top plate inner formwork 28 is suspended through the top plate top formwork 30, and the top plate channel 29 is suspended through the top plate inner formwork 28. The top plate inner formwork 28, the top end of the web 05, the top plate side formwork 27 and the top plate top formwork 30 enclose the top plate 06 casting area; the lower chord channel 9 and the upper chord channel 8 are connected through a vertically arranged connecting channel 10.

[0065] Specifically, the side formwork 27 of the top plate is made of steel formwork. The inner formwork 28 of the top plate and the top formwork 30 of the top plate both include bamboo plywood, square timbers, cross-links and longitudinal beams. The bamboo plywood is connected to the square timbers, the square timbers are connected to the cross-links, and the cross-links are connected to the longitudinal beams. Among them, the bamboo plywood of the inner formwork 28 of the top plate is arranged upward, and the bamboo plywood of the top formwork 30 of the top plate is arranged downward. The inner formwork 28 of the top plate and the top formwork 30 of the top plate are connected by tie bolts. The inner formwork 28 of the top plate and the side formwork 27 of the top plate are connected by tie bolts. The side formwork 27 of the top plate, the inner formwork 28 of the top plate and the top formwork 30 of the top plate are respectively connected to the upper chord 01 by tie rods. The side formworks 27 on both sides are connected by tie bolts. The top of the side formwork 27 of the top plate is connected to the top formwork 30 of the top plate.

[0066] Specifically, the steel gangplank 14 is laid on the top plate channel 29, and the triangular timbers 15 are arranged at intervals along the length direction of the steel gangplank 14. The structural form of the upper chord channel 8 is the same as that of the lower chord channel 9. Railings 5 are installed on both sides of the upper chord channel 8. As Figure 10 shown, a pump pipe 31 is provided beside the upper chord channel 8, and the pump pipe 31 is used for the conveyance of concrete.

[0067] In a specific embodiment, the bottom plate 04 and the top plate 06 have the same shape and specifications. The inner formwork 28 of the top plate directly uses the inner formwork 7 of the bottom plate by flipping it over and using it in reverse. The side formwork 27 of the top plate directly uses the side formwork 6 of the bottom plate by flipping it over and using it in reverse.

[0068] For the arch bridge external concrete construction platform system described in this embodiment, the bottom plate construction platform is arranged along the entire bridge of the main arch and is not recycled. It is used for the construction of the bottom plate, web and top plate. The web construction platform is recycled and used for the construction of the web and top plate. The top plate construction platform is recycled and used for the construction of the top plate. With the cooperation of the hoisting equipment, the lower chord channel 9, the construction channel 4, the suspension support, the hanging bracket 19, the inner formwork scaffold 20, the upper chord channel 8 and the top plate channel 29, the steel bar binding and formwork installation of each part can be conveniently carried out. The bottom formwork 1 of the bottom plate and the lower chord channel 9 are pre-installed with the arch rib segments, which solves the problem of the initial layout of the construction platform on the inclined surface. The problems of material transfer in narrow spaces are solved through the lower chord channel 9, the construction channel 4, the upper chord channel 8 and the top plate channel 29. This construction platform system reduces the construction difficulty and safety risk of high-altitude operations, improves the construction efficiency, and at the same time has a high turnover utilization rate of the construction platform and saves materials.

[0069] Embodiment 2

[0070] As Figures 1 to 10 shown, for the construction method of the arch bridge external concrete described in the present invention, by using the arch bridge external concrete construction platform system described in Embodiment 1, this method includes the following steps:

[0071] S1. When fabricating the arch rib segments, the construction platform for the bottom plate is assembled and connected to the arch rib segments on the ground in advance and hoisted together with the arch rib segments.

[0072] S2. Bind the steel bars by using the bottom formwork 1 of the bottom plate, set the side formwork 6 of the bottom plate by using the construction passage 4, set the inner formwork 7 of the bottom plate by using the lower chord passage 9. The bottom formwork 1 of the bottom plate, the side formwork 6 of the bottom plate and the inner formwork 7 of the bottom plate are closed for formwork. Pour the bottom plate 04 on the construction platform of the bottom plate to form the bottom plate ring.

[0073] S3. After the bottom plate ring is formed, install the suspension support and the hanger 19 by using the hoisting equipment. Build the inner formwork scaffold 20 on the bottom plate 04. Bind the steel bars by using the hanger 19 and the inner formwork scaffold 20. Set the outer formwork 21 of the web by using the hoisting equipment and the hanger 19. Set the inner formwork 22 of the web by using the hoisting equipment and the inner formwork scaffold 20. The outer formwork 21 of the web and the inner formwork 22 of the web are closed for formwork. Pour the web 05 on the construction platform of the web. After completing one arch rib segment, use the hoisting equipment to turnover the suspension support, the hanger 19, the inner formwork scaffold 20, the outer formwork 21 of the web and the inner formwork 22 of the web to pour the web 05 of the next arch rib segment, and circulate in this way to complete the pouring and forming of the web ring.

[0074] S4. After the web ring is formed, turnover the suspension support and the hanger 19 by using the hoisting equipment. Set the top formwork 30 of the top plate by using the hoisting equipment and the upper chord passage 8. Set the side formwork 27 of the top plate by using the hoisting equipment and the hanger 19. Set the inner formwork 28 of the top plate by using the hoisting equipment and the top formwork 30. Set the top plate passage 29 by using the inner formwork 28 of the top plate. The inner formwork 28 of the top plate, the side formwork 27 of the top plate and the top formwork 30 of the top plate are closed for formwork. Pour the top plate 06 on the construction platform of the top plate. After completing one arch rib segment, use the hoisting equipment to turnover the suspension support, the hanger 19, the top formwork 30 of the top plate, the side formwork 27 of the top plate, the inner formwork 28 of the top plate and the top plate passage 29 to pour the top plate 06 of the next arch rib segment, and circulate in this way to complete the pouring and forming of the top plate ring.

[0075] A construction method for the concrete outside package of an arch bridge. The construction platform for the bottom slab is arranged along the entire bridge of the main arch without turnover and is used for the construction of the bottom slab, web and top slab. The construction platform for the web is used in a turnover manner and is used for the construction of the web and top slab. The construction platform for the top slab is used in a turnover manner and is used for the construction of the top slab. With the cooperation of the hoisting equipment, the lower chord channel 9, the construction channel 4, the suspension bracket, the hanging bracket 19, the internal formwork scaffolding 20, the upper chord channel 8 and the top slab channel 29, the steel bar binding and formwork installation of each part can be conveniently carried out. The bottom formwork 1 of the bottom slab and the lower chord channel 9 are pre-installed along with the arch rib segments, solving the problem of the initial layout of the construction platform on the inclined surface. The problems of material transfer in narrow spaces are solved through the lower chord channel 9, the construction channel 4, the upper chord channel 8 and the top slab channel 29. This construction method reduces the construction difficulty and safety risks of high-altitude operations, improves the construction efficiency, and at the same time has a high turnover utilization rate of the construction platform and saves materials.

[0076] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An external concrete construction platform system for an arch bridge, characterized in that, Comprising: The bottom plate construction platform includes a bottom plate bottom form (1) and a lower chord passage (9). The bottom plate bottom form (1) is connected to the lower chord (02) through a connecting piece during the prefabrication of the arch rib segment in the factory. The bottom plate bottom form (1) is hoisted and spliced along with the arch rib segment. Both sides of the bottom plate bottom form (1) extend out of the lower chord (02) to form a construction passage (4). The lower chord passage (9) is laid along the arch rib and is connected to the lower chord horizontal bracing rod (11). The bottom plate side form (6) is arranged through the construction passage (4), and the bottom plate inner form (7) is arranged through the lower chord passage (9). The bottom plate bottom form (1), the bottom plate side form (6), and the bottom plate inner form (7) enclose the pouring area of the bottom plate (04); The web construction platform includes a suspension bracket, a hanging bracket (19), and an inner form scaffolding (20). The suspension bracket is connected to the upper chord (01). The hanging bracket (19) is connected to the suspension bracket and is located outside the stiffening skeleton (03). The inner form scaffolding (20) is arranged on the bottom plate (04). The web outer form (21) is arranged through the hanging bracket (19), and the web inner form (22) is arranged through the inner form scaffolding (20). The web outer form (21), the top end of the bottom plate (04), and the web inner form (22) enclose the pouring area of the web (05); The top plate construction platform includes an upper chord passage (8) and a top plate passage (29). The upper chord passage (8) is laid along the arch rib and is connected to the upper chord horizontal bracing rod. The top plate side form (27) is arranged through the hanging bracket (19), the top plate top form (30) is arranged through the upper chord passage (8), the top plate inner form (28) is suspended through the top plate top form (30), and the top plate passage (29) is suspended through the top plate inner form (28). The top plate inner form (28), the top end of the web (05), the top plate side form (27), and the top plate top form (30) enclose the pouring area of the top plate (06).

2. The arch bridge concrete outer casing construction platform system according to claim 1, characterized in that, The bottom plate bottom forms (1) between adjacent arch rib segments are connected through a filling section (2).

3. The arch bridge concrete outer casing construction platform system according to claim 1, characterized in that, The connecting piece is a U-shaped pull rod (3). The U-shaped groove of the U-shaped pull rod (3) fits the top of the lower chord (02), and the straight edge of the U-shaped pull rod (3) is bolted to the bottom plate bottom form (1).

4. The concrete construction platform system for arch bridge cladding according to claim 1, characterized in that, The lower chord passage (9) and the upper chord passage (8) are connected through a vertically arranged connecting passage (10).

5. The concrete casting platform system for the outside of an arch bridge according to claim 1, wherein The lower chord passage (9) includes two rows of angle steels (12) laid along the arch rib. A number of steel bars (13) are arranged at intervals between the two rows of angle steels (12). Steel jump boards (14) are laid between the angle steels (12), and triangular woods (15) are arranged at intervals on the steel jump boards (14).

6. The arch bridge external concrete construction platform system according to claim 1, characterized in that, The suspension bracket includes a distribution beam (16), a connecting beam (17) and a movable hanger (18). The distribution beam (16) is detachably connected to a precast support at the top of the upper chord (01). A number of pairs of the distribution beams (16) are respectively provided on a pair of upper chords (01). The connecting beam (17) is used to connect between each pair of the distribution beams (16). The movable hanger (18) is slidably arranged on the distribution beam (16), and the movable hanger (18) is connected to the hanger (19).

7. The construction platform system for the externally wrapped concrete of an arch bridge according to claim 1, wherein At the cross brace (23) of the arch rib, the hanger (19) is not provided, and an inner scaffold (24) is provided. The bottom of the inner scaffold (24) is connected to the construction passage (4), the top is connected to the cross brace (23), and the middle part is connected to the stiffening skeleton (03) and / or the bottom plate (04) through the wall-attached member (25).

8. The construction platform system for the externally wrapped concrete of the arch bridge according to claim 7, characterized in that, When the bottom plate (04) is poured, embedded ducts (26) are arranged, and the wall-attached member (25) passes through the embedded ducts (26) to connect the bottom plate (04).

9. The arch bridge concrete outer casing construction platform system according to any one of claims 1-8, characterized in that The bottom plate (04) and the top plate (06) have the same shape and specifications. The inner formwork (28) of the top plate is directly inverted by using the inner formwork (7) of the bottom plate, and the side formwork (27) of the top plate is directly inverted by using the side formwork (6) of the bottom plate.

10. A construction method for the concrete covering of an arch bridge, characterized in that, Using the arch bridge outer concrete construction platform system according to any one of claims 1-9, the method includes the following steps: S1. When manufacturing the arch rib segment, the bottom plate construction platform is assembled and connected to the arch rib segment in advance on the ground and hoisted together with the arch rib segment; S2. Bind steel bars by using the bottom formwork (1) of the bottom plate, set the side formwork (6) of the bottom plate by using the construction passage (4), set the inner formwork (7) of the bottom plate by using the lower chord passage (9), close the bottom formwork (1) of the bottom plate, the side formwork (6) of the bottom plate and the inner formwork (7) of the bottom plate, and pour the bottom plate (04) on the bottom plate construction platform to form a ring-shaped bottom plate; S3. After the ring-shaped bottom plate is formed, install the suspension bracket and the hanger (19) by using a hoisting device, build the inner formwork scaffold (20) on the bottom plate (04), bind steel bars by using the hanger (19) and the inner formwork scaffold (20), set the outer formwork (21) of the web by using the hoisting device and the hanger (19), set the inner formwork (22) of the web by using the hoisting device and the inner formwork scaffold (20), close the outer formwork (21) of the web and the inner formwork (22) of the web, and pour the web (05) on the web construction platform; after completing one arch rib segment, use the hoisting device to turnover the suspension bracket, the hanger (19), the inner formwork scaffold (20), the outer formwork (21) of the web and the inner formwork (22) of the web to pour the web (05) of the next arch rib segment, and cycle in this way to complete the ring-shaped pouring of the web. S4. After the web ring is formed, use the lifting equipment to transfer the suspension bracket and the hanging bracket (19), use the lifting equipment and the upper chord channel (8) to set the top formwork (30) of the roof slab, use the lifting equipment and the hanging bracket (19) to set the side formwork (27) of the roof slab, use the lifting equipment and the top formwork (30) of the roof slab to set the inner formwork (28) of the roof slab, use the inner formwork (28) of the roof slab to set the roof slab channel (29), close the inner formwork (28), the side formwork (27) and the top formwork (30) of the roof slab, and pour the roof slab (06) on the roof slab construction platform; after completing one arch rib segment, use the lifting equipment to transfer the suspension bracket, the hanging bracket (19), the top formwork (30) of the roof slab, the side formwork (27) of the roof slab, the inner formwork (28) of the roof slab and the roof slab channel (29) to pour the roof slab (06) of the next arch rib segment, and complete the pouring and forming of the roof slab ring in this cycle.

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