Walking type portal frame for water conservancy aqueduct cast-in-situ box girder post-pouring belt and construction method

Abstract

This invention discloses a mobile gantry and construction method for the post-cast strip of cast-in-place box girder in a hydraulic aqueduct. The mobile gantry includes: a main frame arranged laterally above the aqueduct; legs connected to the main frame to support it on both sides of the aqueduct top; lifting and traveling mechanisms on the legs; symmetrically arranged outer rib assemblies at both ends of the main frame, one end of which is rotatably connected to the main frame, and the other end detachably connected to an anchor bracket fixed to the pier top; an outer formwork connected to the outer rib assemblies, which are equipped with a tilting mechanism; a transport vehicle that can move longitudinally along a longitudinal track; and a lifting mechanism installed on the main frame. This invention can meet the construction requirements of post-cast strips under various complex conditions, shortens the overall construction cycle, effectively solves the problems of lack of lifting machinery and difficulty in formwork installation, and increases the adaptability of post-cast strip construction under complex conditions.

Description

Technical Field

[0001] This invention relates to the field of construction technology for post-cast strips in hydraulic aqueducts, and in particular to a mobile gantry frame and construction method for post-cast strips of cast-in-place box girders in hydraulic aqueducts. Background Technology

[0002] As one of the main structures in a water diversion project, the construction quality, safety, and progress of the aqueduct directly affect the construction of the water diversion project.

[0003] A post-cast strip is a concrete strip left at the corresponding position of the foundation slab, wall, or beam during construction to prevent harmful cracks that may occur in the cast-in-place reinforced concrete structure due to uneven shrinkage or settlement, in accordance with design or construction specifications.

[0004] Due to factors such as water conservancy, topography, and geological conditions, the construction of post-cast strips in existing hydraulic aqueducts faces the following challenges:

[0005] 1. Currently, the construction equipment for hydraulic aqueducts can only meet the requirements for cast-in-place box girder pouring between bridge piers. Due to the limitations of construction space and support positions, large trenching machines or mobile formwork cannot meet the requirements for post-pouring strip construction.

[0006] 2. Currently, common construction techniques for post-pouring strips include erecting a full-span scaffold to form a formwork support system, or setting hanging rod holes on the post-pouring strip to utilize suspended formwork for construction. Both methods involve a large workload for scaffold and formwork installation and dismantling, and carry high safety risks.

[0007] 3. In the traditional post-pouring strip construction process, the outer formwork is all loose formwork, and the outer formwork is located outside the already poured concrete beam. The installation and dismantling of the outer formwork requires the assistance of large lifting equipment, which is time-consuming and costly.

[0008] 4. Due to the influence of the terrain, large lifting equipment is difficult to meet the needs of on-site transportation, making the handling of inner and outer molds and other auxiliary facilities a major problem.

[0009] Therefore, traditional construction techniques are no longer sufficient to meet the requirements of post-cast strip construction. Developing new technologies and supporting equipment for post-cast strip construction in large aqueducts is of great strategic significance in solving the construction problems of post-cast strips in large aqueducts in water diversion projects. Summary of the Invention

[0010] The present invention aims to propose a mobile gantry and construction method for the post-cast strip of cast-in-place box girder in hydraulic aqueducts, thereby solving the problem of cumbersome construction of the post-cast strip of cast-in-place box girder in existing hydraulic aqueducts.

[0011] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0012] A mobile gantry frame for the post-cast strip of cast-in-place box girder in a hydraulic aqueduct includes a main frame, legs, outer rib assembly, outer formwork, inner formwork, transport vehicle, and lifting mechanism, wherein:

[0013] The main frame is arranged horizontally and located above the aqueduct;

[0014] Longitudinal tracks are provided on both sides of the top of the aqueduct, and the longitudinal tracks cross the post-cast strip area;

[0015] The outriggers are connected to the main frame and are used to support the main frame on both sides of the top of the aqueduct. The outriggers are equipped with a lifting mechanism and a traveling mechanism. The lifting mechanism is used to lift and lower the whole machine, and the traveling mechanism can move longitudinally along the longitudinal track.

[0016] The outer rib assembly is symmetrically arranged at both ends of the main frame in the horizontal direction. One end of the outer rib assembly is rotatably connected to the main frame, and the other end of the outer rib assembly is detachably connected to the anchor bracket, which is fixed to the top of the pier.

[0017] The outer mold is connected to the outer rib assembly, and the outer rib assembly is provided with a flipping mechanism. The flipping mechanism is used to drive the outer rib assembly to rotate carrying the outer mold, thereby realizing the opening or closing of the outer mold.

[0018] The transport vehicle can move longitudinally along the longitudinal track;

[0019] The lifting mechanism is installed on the main frame.

[0020] Furthermore, the main frame includes main beams, connecting beams, and cantilever beams;

[0021] The main beam is a box-type truss structure, and there are two main beams extending longitudinally.

[0022] The cantilever beam is a triangular truss structure, and the cantilever beam and the main beam are welded together as a whole;

[0023] The connecting beam is a box-type truss structure, and the connecting beam is arranged laterally and connected to the two main beams by pins.

[0024] The main frame is symmetrical in both the longitudinal and transverse directions.

[0025] Furthermore, the outrigger includes a column, a support cylinder, a rotating beam, and a first travel wheel box;

[0026] One end of the column is connected to the main frame, and the other end of the column is connected to the support cylinder. The support cylinder is placed on the poured concrete beam surface and is used for lifting and lowering the whole machine, forming the lifting mechanism.

[0027] One end of the rotating beam is rotatably connected to the middle of the column, and the rotating beam can rotate around the column and be fixed in position. The other end of the rotating beam is connected to the first traveling wheel box to form the traveling mechanism.

[0028] The traveling mechanism has two states: working and retracted. In the working state, the rotating beam and the first traveling wheel box rotate and are positioned above the longitudinal track. As the support cylinder falls, the first traveling wheel box is supported on the longitudinal track and travels in coordination with the longitudinal track.

[0029] When retracted, the support cylinder rises, the first traveling wheel box is disengaged, and the rotating beam and the first traveling wheel box rotate a certain angle and then position themselves, thereby clearing the position of the longitudinal track.

[0030] Furthermore, the transport vehicle includes a frame and a second running wheel box connected to the frame; when the outriggers' walking mechanism is in the retracted state, the second running wheel box of the transport vehicle travels in coordination with the longitudinal track.

[0031] Furthermore, the longitudinal transfer track is configured as follows: the fish-belly beam spans the post-cast strip area, and a longitudinal groove is provided on the fish-belly beam, with the longitudinal transfer track installed in the groove.

[0032] Furthermore, the tilting mechanism includes a tilting cylinder disposed between the outer rib assembly and the main frame.

[0033] Furthermore, the lifting mechanism includes a transverse track, an electric hoist, and a construction platform. The two ends of the transverse track are connected to the main beam, and the electric hoist is installed on the transverse track so that the electric hoist can move laterally along the transverse track. The construction platform is connected to the electric hoist by a wire rope, and the construction platform has a foldable structure.

[0034] Furthermore, it also includes a pier top formwork, wherein the outer formwork and the inner formwork are fixed together with water-stop bolts.

[0035] This invention also discloses a method for constructing through-holes in a traveling gantry for the post-cast strip of a cast-in-place box girder in a hydraulic aqueduct, comprising the following steps:

[0036] The first step is to complete the construction of the post-cast strip, and then remove the inner formwork, anchor brackets, pier top formwork, and water-stop bolts.

[0037] The second step is to operate the tilting cylinder to rotate and open the outer rib assembly and outer mold, so that the whole machine avoids the bridge pier;

[0038] The third step is to install the longitudinal track and the fish-belly beam, and rotate the rotating crossbeam and the first traveling wheel box into place;

[0039] Fourth step: Operate the support cylinder to lower the entire machine. At this time, the first traveling wheel box is supported on the longitudinal track. Continue to operate the support cylinder until the support cylinder is disengaged.

[0040] Step 5: Move the entire machine longitudinally through the hole to the front post-pouring strip;

[0041] Step 6: Operate the support cylinder to raise the entire machine. At this time, the first traveling wheel box will be disengaged. Rotate the rotating crossbeam and the first traveling wheel box 90 degrees around the column and then fix them.

[0042] Step 7: Operate the tilting cylinder to rotate and close the outer rib assembly with the outer mold, completing the through hole.

[0043] This invention also discloses a method for casting a traveling gantry for the post-cast strip of a cast-in-place box girder in a hydraulic aqueduct, comprising the following steps:

[0044] The first step is to complete the installation of the entire machine. At this time, the inner formwork and water-stop bolts have not been installed yet. The transport vehicle carrying the steel bars travels to the designated position.

[0045] The second step is to use the construction platform to tie the reinforcing bars and install the inner formwork and water-stop bolts.

[0046] The third step is to pour the post-cast strip concrete.

[0047] The fourth step is to perform the through-hole operation, which is carried out according to the through-hole construction method described in claim 9.

[0048] Fifth, repeat steps one through four until the pouring strip construction is completed.

[0049] The beneficial effects of this invention are:

[0050] The mobile gantry and construction method of the present invention for the post-cast strip of cast-in-place box girder in hydraulic aqueducts can meet the construction of post-cast strips under various complex conditions, as detailed below:

[0051] 1. The design incorporates a gantry structure, which reduces the overall weight of the machine and allows the gantry to be supported on both sides of the top of the aqueduct, thus meeting the requirements for the construction of post-cast strips in various beam-type aqueducts.

[0052] 2. By using a transport vehicle and an electric hoist together, the problem of transporting inner and outer formwork and steel bars during the construction of post-pouring strips can be solved;

[0053] 3. During the construction of the post-pouring strip, the operating height is relatively high when installing and dismantling the inner formwork and tying the reinforcing bars. The lifting mechanism is equipped with an electric hoist and a construction platform. The construction platform is foldable and can be raised and lowered by the electric hoist to meet the construction operations at different heights and improve construction safety.

[0054] 4. The outer rib assembly is equipped with a tilting cylinder, which controls the opening and closing of the template through electro-hydraulic proportional control. This ensures that the whole machine is not twisted or deformed when opening and closing, has good integrity, and is easy to align precisely. The tilting cylinder makes the outer mold rotate and open with the outer rib assembly and then move forward. During the process, the outer mold does not need to be repeatedly installed and disassembled, which improves the recycling efficiency of the template.

[0055] 5. The outriggers are equipped with a rotating crossbeam and a first traveling wheel box, which can allow the whole machine to move longitudinally on the top of the aqueduct when crossing the hole. The first traveling wheel box can rotate and be fixed with the rotating crossbeam, and at the same time, it can meet the longitudinal transportation of the transport vehicle in the pouring state. Therefore, only one longitudinal track needs to be laid on site to meet the usage requirements under different construction states and improve construction efficiency.

[0056] In this invention, the entire construction process is mechanized to complete the on-site pouring and hole-passing operations of the post-pouring strip, which reduces a large number of auxiliary lifting machinery and personnel operations, saves a lot of manpower, material resources and financial resources, improves the safety of personnel operation, shortens the entire construction cycle, effectively solves the problems of construction without lifting machinery and difficult formwork installation, and increases the adaptability of post-pouring strip construction under complex conditions. Attached Figure Description

[0057] Figure 1 This is a front view of a traveling gantry for the post-cast strip of a cast-in-place box girder in a hydraulic aqueduct, according to an embodiment of the present invention.

[0058] Figure 2 This is the main frame front view of an embodiment of the present invention;

[0059] Figure 3 This is a top view of the main frame of an embodiment of the present invention;

[0060] Figure 4 This is a side view of the support leg according to an embodiment of the present invention;

[0061] Figure 5 This is a front view of the outer rib assembly according to an embodiment of the present invention;

[0062] Figure 6 This is a front view of the transport vehicle according to an embodiment of the present invention;

[0063] Figure 7 This is a front view of the lifting mechanism according to an embodiment of the present invention;

[0064] Figure 8 This is a schematic diagram of the first step of the through-hole construction method according to an embodiment of the present invention;

[0065] Figure 9 for Figure 8 Side view;

[0066] Figure 10 This is a schematic diagram of the second step of the through-hole construction method according to an embodiment of the present invention;

[0067] Figure 11 for Figure 10 Side view;

[0068] Figure 12 This is a schematic diagram of the third step of the through-hole construction method according to an embodiment of the present invention;

[0069] Figure 13 for Figure 12 Side view;

[0070] Figure 14 This is a schematic diagram of the fourth step of the through-hole construction method according to an embodiment of the present invention;

[0071] Figure 15 for Figure 14 Side view;

[0072] Figure 16 This is a schematic diagram of the fifth step of the through-hole construction method according to an embodiment of the present invention;

[0073] Figure 17 for Figure 16 Side view;

[0074] Figure 18 This is a schematic diagram of the sixth step of the through-hole construction method according to an embodiment of the present invention;

[0075] Figure 19 for Figure 18 Side view;

[0076] Figure 20 This is a schematic diagram of the seventh step of the through-hole construction method according to an embodiment of the present invention;

[0077] Figure 21 for Figure 20 Side view;

[0078] Figure 22 This is a schematic diagram of the first step of the pouring construction method according to an embodiment of the present invention;

[0079] Figure 23 for Figure 22 Side view;

[0080] Figure 24 This is a schematic diagram of the second step of the pouring construction method according to an embodiment of the present invention;

[0081] Figure 25 for Figure 24 Side view.

[0082] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0083] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0084] like Figure 1As shown, the mobile gantry for the post-cast strip of the cast-in-place box girder of the hydraulic aqueduct provided in this embodiment includes: main frame 1, legs 2, outer rib assembly 3, outer formwork 4, inner formwork 5, anchor bracket 6, transport vehicle 7, lifting mechanism 8, pier top formwork 10, and water-stop bolt 9.

[0085] Specifically, such as Figure 2-3 As shown, the main frame 1 is arranged laterally and located above the aqueduct. The main frame 1 includes main beams 11, connecting beams 12, and cantilever beams 13. The main beams 11 are box-truss structures, extending longitudinally and consisting of two beams. The connecting beams 12 are also box-truss structures, arranged laterally. The cantilever beams 13 are triangular truss structures. The main beams 11 and cantilever beams 13 are welded together and then connected to the connecting beams 12 using pins. The main frame 1 is symmetrical in both the longitudinal and transverse directions.

[0086] like Figure 4 As shown, the outrigger 2 is connected to the main frame 1 and is used to support the main frame 1 on both sides of the top of the aqueduct. The outrigger 2 includes a first strut 14, a column 15, a support cylinder 16, a rotating crossbeam 17, and a first wheel box 18. One end of the column 15 is connected to the main beam 11, and the other end of the column 15 is connected to the support cylinder 16. The support cylinder 16 is placed on the poured concrete beam surface and is used for lifting and lowering the entire machine.

[0087] One end of the rotating beam 17 is rotatably connected to the middle of the column 15 and is equipped with a position locking device (the position locking device is existing technology and can be a pin positioning or other structure). The other end of the rotating beam 17 is connected to the first traveling wheel box 18. The rotating beam 17 and the first traveling wheel box 18 can rotate around the column 15 and be fixedly positioned. After rotating, the rotating beam 17 and the first traveling wheel box 18 need to be fixedly connected to the column 15 through the position locking device. One end of the first support rod 14 is connected to the main beam 11, and the other end of the first support rod 14 is connected to the column 15 to ensure structural stability.

[0088] like Figure 6 As shown, the transport vehicle 7 includes a second wheel box 22 and a frame 23, with the second wheel box 22 connected to the frame 23.

[0089] In this embodiment, due to the limited space at the top of the aqueduct, the second wheel box 22 of the transport vehicle 7 and the first wheel box 18 of the outrigger 2 share a longitudinal track 24, which reduces the amount of work on site.

[0090] The longitudinal transfer track 24 is laid longitudinally on both sides of the top of the aqueduct, crossing the post-cast strip area. Because the gap in the post-cast strip is large (approximately 2 meters), the longitudinal transfer track 24 needs to pass through it, but its strength is insufficient. Therefore, a fish-belly beam 25 is designed at the post-cast strip location. The fish-belly beam 25 has a longitudinal groove, and the longitudinal transfer track 24 is installed within the groove. The fish-belly beam 25 serves to support the track.

[0091] The first traveling wheel box 18 of the outrigger 2 has two states: working and retracted. In the working state, the rotating beam 17 and the first traveling wheel box 18 rotate and are positioned above the longitudinal track. As the support cylinder 16 falls, the first traveling wheel box 18 is supported on the longitudinal track 24 and moves in coordination with the longitudinal track 24 to serve the hole-passing operation.

[0092] When retracted, the support cylinder 16 rises, the first traveling wheel box 18 is disengaged, the rotating beam 17 and the first traveling wheel box 18 rotate 90 degrees and are then positioned, thereby clearing the longitudinal track position.

[0093] When the first traveling wheel box 18 is in the retracted state, it clears the longitudinal track to facilitate the passage of the transport vehicle 7. At this time, the second traveling wheel box 22 of the transport vehicle 7 can enter the longitudinal track to travel.

[0094] like Figure 5 As shown, the outer rib assembly 3 includes a tilting cylinder 19, a platform 20 and an outer rib 21. The platform 20 and the outer rib 21 are welded together as a whole. The interior of the outer rib 21 can be used as a personnel safety passage. One end of the outer rib 21 is rotatably connected to the main frame 1, and the other end of the outer rib 21 is detachably connected to the anchor bracket 6. The anchor bracket is fixed to the top of the pier using embedded parts.

[0095] The outer mold 4 is connected to the outer rib 21. A tilting cylinder 19 is provided between the outer rib 21 and the cantilever beam 13 of the main frame 1. The tilting cylinder 19 is used to drive the outer rib assembly 3 to rotate the outer mold 4, thereby realizing the opening or closing of the outer mold 4.

[0096] like Figure 7 As shown, the lifting mechanism 8 includes a transverse track 27, an electric hoist 28, a second support rod 26, a lifting platform 29, a rotating platform 30, and a wire rope 31. The transverse track 27 is connected to the main beam 11 and is reinforced by the second support rod 26. One end of the second support rod 26 is connected to the main beam 11, and the other end is connected to the transverse track 27. The electric hoist 28 is installed on the transverse track 27 and can move laterally along the transverse track 27. The lifting platform 29 is connected to the electric hoist 28 via the wire rope 31. The rotating platform 30 can be rotated and folded and fixed to the lifting platform 29. By folding, the lateral dimensions are reduced, and then the electric hoist 28 is used to raise and lower the lifting platform 29 and the rotating platform 30 to meet the needs of construction operations at different heights.

[0097] The outer mold 4 and the inner mold 5 are fixed together by the water-stop screw 9.

[0098] This invention designs a gantry structure, which reduces the overall weight of the machine and allows the gantry to be supported on both sides of the top of the aqueduct, thus meeting the construction requirements of post-cast strips for various beam-type aqueducts.

[0099] This invention solves the transportation problem of inner and outer formwork and reinforcing bars during the construction of post-pouring strips by using a transport vehicle and an electric hoist in combination.

[0100] During the construction of the post-pouring strip, the operating height is relatively high when installing and dismantling the inner formwork and tying the reinforcing bars. The lifting mechanism is equipped with an electric hoist and a construction platform. The construction platform is foldable and can be raised and lowered by the electric hoist to meet the needs of construction operations at different heights and improve construction safety.

[0101] The outer rib assembly is equipped with a tilting cylinder, which controls the opening and closing of the template through electro-hydraulic proportional control. This ensures that the whole machine is not twisted or deformed when opening and closing, has good integrity, and is easy to align precisely. The tilting cylinder allows the outer mold to rotate and open with the outer rib assembly before moving forward. During the process, the outer mold does not need to be repeatedly installed and disassembled, which improves the recycling efficiency of the template.

[0102] The outriggers are equipped with a rotating crossbeam and a first traveling wheel box, which allows the entire machine to move longitudinally on the top of the aqueduct when crossing the hole. The first traveling wheel box can rotate and be fixed with the rotating crossbeam, and at the same time, it meets the longitudinal transportation of the transport vehicle in the pouring state. Therefore, only one longitudinal track needs to be laid on site to meet the usage requirements under different construction states, thus improving construction efficiency.

[0103] This embodiment also discloses a method for constructing the through-hole of a traveling gantry for the post-cast strip of a cast-in-place box girder in a hydraulic aqueduct, including the following steps:

[0104] First step, such as Figure 8 and Figure 9 As shown, the post-cast strip construction is completed, and the inner formwork 5, anchor bracket 6, pier top formwork 10 and water-stop bolt 9 are removed;

[0105] The second step, as Figure 10 and Figure 11 As shown, by operating the tilting cylinder 19, the outer rib assembly 3 and the outer mold 4 are rotated and opened, and the whole machine avoids the bridge pier;

[0106] The third step, as Figure 12 and Figure 13 As shown, the longitudinal track 24 and the fish-belly beam 25 are installed, and the rotating crossbeam 17 and the first traveling wheel box 8 are rotated into place and then fixedly connected to the column 15.

[0107] Step four, as Figure 14 and Figure 15 As shown, operate the support cylinder 16 to lower the whole machine. At this time, the first traveling wheel box 8 is supported on the longitudinal track 24. Continue to operate the support cylinder 16 until the support cylinder 16 is disengaged.

[0108] Step 5, as Figure 16 and Figure 17 As shown, the entire machine is moved longitudinally through the hole to the front post-pouring strip;

[0109] Step 6, as follows Figure 18 and Figure 19 As shown, operate the support cylinder 16 to raise the whole machine. At this time, the first traveling wheel box 8 is disengaged. After rotating the rotating crossbeam 17 and the first traveling wheel box 8 by 90 degrees, it is fixedly connected to the column 15.

[0110] Step 7, as Figure 20 and Figure 21 As shown, by operating the tilting cylinder 19, the outer rib assembly 3 and the outer mold 4 are rotated and closed to complete the through hole.

[0111] This embodiment also discloses a method for casting a traveling gantry for the post-cast strip of a cast-in-place box girder in a hydraulic aqueduct, including the following steps:

[0112] First step, such as Figure 22 and Figure 23 As shown, the entire machine is installed (the inner mold 5 and the water-stop screw 9 are not installed at this time), and the transport vehicle 7 carries the steel bars to the designated position;

[0113] The second step, as Figure 24 and Figure 25 As shown, the construction platform is used to tie the reinforcing bars and install the inner formwork 5 and the water-stop bolts 9;

[0114] The third step is to pour the post-cast strip concrete.

[0115] The fourth step is to carry out the through-hole operation, which shall be carried out in accordance with the through-hole construction method;

[0116] Fifth, repeat steps one through four until the pouring strip construction is completed.

[0117] In this invention, the entire construction process is mechanized to complete the on-site pouring and hole-passing operations of the post-pouring strip, which reduces a large number of auxiliary lifting machinery and personnel operations, saves a lot of manpower, material resources and financial resources, improves the safety of personnel operation, shortens the entire construction cycle, effectively solves the problems of construction without lifting machinery and difficult formwork installation, and increases the adaptability of post-pouring strip construction under complex conditions.

[0118] This invention can meet the construction requirements of post-pouring strips under various complex conditions.

[0119] The above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention without departing from the spirit and scope of the present invention. Any modifications or partial substitutions should be covered within the scope of the claims of the present invention.

[0120] If the terms "first" or "second" are used in this document to define components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing the invention and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0121] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0122] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A walking gantry for water conservancy aqueduct cast-in-situ box girder post-cast strip, characterized in that: Includes the main frame, outriggers, outer rib assembly, outer mold, inner mold, transport vehicle, and lifting mechanism, among which: The main frame is arranged horizontally and located above the aqueduct; Longitudinal tracks are provided on both sides of the top of the aqueduct, and the longitudinal tracks cross the post-cast strip area; The outriggers are connected to the main frame and are used to support the main frame on both sides of the top of the aqueduct. The outriggers are equipped with a lifting mechanism and a traveling mechanism. The lifting mechanism is used to lift and lower the whole machine, and the traveling mechanism can move longitudinally along the longitudinal track. The outer rib assembly is symmetrically arranged at both ends of the main frame in the horizontal direction. One end of the outer rib assembly is rotatably connected to the main frame, and the other end of the outer rib assembly is detachably connected to the anchor bracket, which is fixed to the top of the pier. The outer mold is connected to the outer rib assembly, and the outer rib assembly is provided with a flipping mechanism. The flipping mechanism is used to drive the outer rib assembly to rotate carrying the outer mold, thereby realizing the opening or closing of the outer mold. The transport vehicle can move longitudinally along the longitudinal track; The lifting mechanism is installed on the main frame.

2. The walking gantry for water conservancy aqueduct cast-in-situ box girder post-cast strip according to claim 1, characterized in that: The main frame includes main beams, connecting beams, and cantilever beams; The main beam is a box-type truss structure, and there are two main beams extending longitudinally. The cantilever beam is a triangular truss structure, and the cantilever beam and the main beam are welded together as a whole; The connecting beam is a box-type truss structure, and the connecting beam is arranged laterally and connected to the two main beams by pins. The main frame is symmetrical in both the longitudinal and transverse directions.

3. The walking gantry for water conservancy aqueduct cast-in-situ box girder post-cast strip according to claim 2, characterized in that: The outrigger includes a column, a support cylinder, a rotating beam, and a first traveling wheel box; One end of the column is connected to the main frame, and the other end of the column is connected to the support cylinder. The support cylinder is placed on the poured concrete beam surface and is used for lifting and lowering the whole machine, forming the lifting mechanism. One end of the rotating beam is rotatably connected to the middle of the column, and the rotating beam can rotate around the column and be fixed in position. The other end of the rotating beam is connected to the first traveling wheel box to form the traveling mechanism. The traveling mechanism has two states: working and retracted. In the working state, the rotating beam and the first traveling wheel box rotate and are positioned above the longitudinal track. As the support cylinder falls, the first traveling wheel box is supported on the longitudinal track and travels in coordination with the longitudinal track. When retracted, the support cylinder rises, the first traveling wheel box is disengaged, and the rotating beam and the first traveling wheel box rotate a certain angle and then position themselves, thereby clearing the position of the longitudinal track.

4. The walking gantry for water conservancy aqueduct cast-in-situ box girder post-cast strip according to claim 3, characterized in that: The transport vehicle includes a frame and a second running wheel box connected to the frame; when the outriggers are in the retracted state, the second running wheel box of the transport vehicle travels in coordination with the longitudinal track.

5. The walking gantry for water conservancy aqueduct cast-in-situ box girder post-cast strip according to claim 4, characterized in that: The longitudinal transfer track is set up as follows: the fish-belly beam spans the post-cast strip area, and a longitudinal groove is provided on the fish-belly beam, and the longitudinal transfer track is installed in the groove.

6. The walking gantry for water conservancy aqueduct cast-in-situ box girder post-cast strip according to claim 5, characterized in that: The flipping mechanism includes a flipping cylinder disposed between the outer rib assembly and the main frame.

7. The walking gantry for water conservancy aqueduct cast-in-situ box girder post-cast strip according to claim 6, characterized in that: The lifting mechanism includes a transverse track, an electric hoist, and a construction platform. The two ends of the transverse track are connected to the main beam. The electric hoist is installed on the transverse track so that it can move laterally along the transverse track. The construction platform is connected to the electric hoist by a wire rope and has a foldable structure.

8. The walking gantry for water conservancy aqueduct cast-in-situ box girder post-cast strip according to claim 7, characterized in that: It also includes a pier top formwork, wherein the outer formwork and the inner formwork are fixed with water-stop bolts.

9. A through-hole construction method for a walking gantry for a cast-in-place box girder post-cast strip of a water conservancy aqueduct according to claim 8, characterized in that Includes the following steps: The first step is to complete the construction of the post-cast strip, and then remove the inner formwork, anchor brackets, pier top formwork, and water-stop bolts. The second step is to operate the tilting cylinder to rotate and open the outer rib assembly and outer mold, so that the whole machine avoids the bridge pier; The third step is to install the longitudinal track and the fish-belly beam, and rotate the rotating crossbeam and the first traveling wheel box into place; Fourth step, operate the support cylinder to lower the whole machine. At this time, the first traveling wheel box is supported on the longitudinal track. Continue operating the support cylinder until it is disengaged; Step 5: Move the entire machine longitudinally through the hole to the front post-pouring strip; Step 6: Operate the support cylinder to raise the entire machine. At this time, the first traveling wheel box will be disengaged. Rotate the rotating crossbeam and the first traveling wheel box 90 degrees around the column and then fix them. Step 7: Operate the tilting cylinder to rotate and close the outer rib assembly with the outer mold, completing the through hole.

10. A pouring construction method for the walking gantry of the post-pouring belt of the water conservancy aqueduct cast-in-place box girder based on the gantry of the post-pouring belt of the water conservancy aqueduct cast-in-place box girder of claim 8, characterized in that Includes the following steps: The first step is to complete the installation of the entire machine. At this time, the inner formwork and water-stop bolts have not been installed yet. The transport vehicle carrying the steel bars travels to the designated position. The second step is to use the construction platform to tie the reinforcing bars and install the inner formwork and water-stop bolts. The third step is to pour the post-cast strip concrete. The fourth step is to perform the through-hole operation, which is carried out according to the through-hole construction method described in claim 9. Fifth, repeat steps one through four until the pouring strip construction is completed.

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