A multi-stage bridge construction platform and its construction method in V-shaped valley hard rock areas

Abstract

This invention belongs to the technical field of construction platforms in V-shaped valley hard rock areas, and provides a multi-stage bridge construction platform and its construction method for V-shaped valley hard rock areas. The construction platform includes a primary construction platform located at the bottom of the valley and secondary construction platforms located on the left and right slopes of the valley. The primary construction platform includes a frame foundation, Bailey bridges, distribution beams, and platform steel plates. The secondary construction platform includes secondary steel pipe piles, secondary load-bearing beams, secondary load-bearing longitudinal beams, secondary L-shaped strip foundations, secondary distribution beams, and secondary platform steel plates. This construction platform uses a frame foundation and steel pipe pile connection as supporting columns, which avoids the difficulties of driving steel pipe piles in hard rock areas, saving materials and construction time. Filling the inside of the steel pipe piles with concrete improves the rigidity of the steel pipe piles and the overall stability of the platform, which is beneficial for withstanding water flow impact.

Description

Technical Field

[0001] This invention belongs to the technical field of construction platforms in V-shaped valley hard rock areas, specifically relating to a multi-stage bridge construction platform and its construction method in V-shaped valley hard rock areas. Background Technology

[0002] With the rapid development of my country's transportation infrastructure, long-span bridges are gradually being built in river valleys and mountainous areas. Bridge construction platforms are important auxiliary structures in construction, serving to connect roads, support heavy machinery, and act as structural processing sites. They are widely used in the construction of important structures such as bridge foundations, piers, and pylons.

[0003] Conventional construction platforms typically employ portal steel pipe pile foundations and Bailey bridge steel structures. First, a vibratory hammer is used to drive steel casings into the soil, then they are connected as a whole, and finally, Bailey bridges are installed on top of the steel casings to form the construction platform. This type of platform is simple in construction and convenient to install. It is a single construction platform and is usually used in areas with open terrain and gentle slopes.

[0004] For V-shaped river valleys with hard rock, characterized by steep slopes, limited space, strong water flow, and hard rock strata, conventional construction platform solutions present the following challenges: 1. The construction platform supports are erected on steep slopes, making support design and installation difficult and posing high safety risks; 2. The high rock strength makes driving steel pipe piles for foundations challenging; 3. The supports, erected on steep slopes, are high-altitude and significantly affected by water flow, requiring high structural stability; 4. The limited construction space makes conventional single-platform solutions insufficient for the access of construction equipment and materials. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a multi-stage bridge construction platform for V-shaped valley hard rock areas, effectively solving the problems of high installation difficulty, difficult steel pipe pile driving, high requirements for support stability, and limited construction space when using conventional construction platforms in V-shaped valley hard rock mountainous areas.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: On the one hand, the present invention provides a multi-stage bridge construction platform in a V-shaped valley hard rock area, including a primary construction platform set at the bottom of the valley and a secondary construction platform set on the left and right slopes of the valley.

[0007] The primary construction platform includes a frame foundation, Bailey bridges, distribution beams, and a platform steel plate. The frame foundation is fixedly installed at the bottom of the valley. Drilling areas are reserved in the frame foundation according to the pile foundation locations. Multiple Bailey bridge anchorage connectors are pre-embedded on the surface of the frame foundation. The Bailey bridges are fixedly installed on the frame foundation through the Bailey bridge anchorage connectors. Adjacent Bailey bridges are fixedly connected by a pergola. The distribution beams are fixedly installed on the Bailey bridges. The platform steel plate is fixedly laid on the distribution beams.

[0008] The secondary construction platform includes secondary steel pipe piles, secondary load-bearing beams, secondary load-bearing longitudinal beams, secondary L-shaped strip foundations, secondary distribution beams, and secondary platform steel plates. Secondary steel pipe pile anchoring connectors are pre-embedded on the surface of the frame foundation. The secondary steel pipe piles are fixedly installed on the frame foundation via these anchoring connectors. The secondary load-bearing beams are fixedly installed at the top of the secondary steel pipe piles. The secondary L-shaped strip foundations are fixedly set at the top of the two side slopes. Secondary load-bearing longitudinal beam anchoring connectors are pre-embedded on the surface of the secondary L-shaped strip foundation. One end of the secondary load-bearing longitudinal beam is fixedly overlapped on the secondary L-shaped strip foundation via the anchoring connectors, and the other end is fixedly overlapped on the secondary load-bearing beam. The secondary distribution beam is fixedly installed on the secondary load-bearing longitudinal beam, and the secondary platform steel plates are fixedly laid on the secondary distribution beam.

[0009] Preferably, the secondary construction platform further includes a secondary transverse connection system, through which adjacent secondary steel pipe piles are fixedly connected.

[0010] Preferably, the secondary construction platform further includes a secondary inclined connection system, through which the secondary steel pipe pile is fixedly connected to the secondary load-bearing longitudinal beam.

[0011] Preferably, the secondary platform steel plate is provided with a secondary safety guardrail, and the secondary platform steel plate is provided with a connecting platform for smoothing the road on the side facing the slope.

[0012] Preferably, the multi-stage bridge construction platform further includes a tertiary construction platform set on the back slope of the valley. The tertiary construction platform includes tertiary steel pipe piles, tertiary load-bearing beams, tertiary load-bearing longitudinal beams, tertiary L-shaped strip foundations, tertiary distribution beams, and tertiary platform steel plates. The surface of the frame foundation is pre-embedded with tertiary steel pipe pile anchorage connectors. The tertiary steel pipe piles are fixedly installed on the frame foundation through the tertiary steel pipe pile anchorage connectors. The tertiary load-bearing beams are fixedly installed on the tertiary steel pipe piles... At the top of the pile, the three-level L-shaped strip foundation is fixedly installed on the top of the back slope. The surface of the three-level L-shaped strip foundation is pre-embedded with a three-level load-bearing longitudinal beam anchor connector. One end of the three-level load-bearing longitudinal beam is fixedly connected to the three-level L-shaped strip foundation through the three-level load-bearing longitudinal beam anchor connector, and the other end of the three-level load-bearing longitudinal beam is fixedly connected to the three-level load-bearing beam. The three-level distribution beam is fixedly installed on the three-level load-bearing longitudinal beam, and the three-level platform steel plate is fixedly laid on the three-level distribution beam.

[0013] Preferably, the three-level construction platform further includes a three-level lateral connection system, through which adjacent three-level steel pipe piles are fixedly connected.

[0014] Preferably, the three-level construction platform further includes a three-level inclined connection system and a three-level convex strip foundation. The three-level convex strip foundation is fixedly set at the midpoint of the back slope. The upper and lower surfaces of the three-level convex strip foundation are pre-embedded with anchoring connectors of the three-level inclined connection system. The three-level inclined connection system is simultaneously fixedly connected to the three-level steel pipe piles, the three-level load-bearing longitudinal beams, and the anchoring connectors of the three-level inclined connection system.

[0015] Preferably, the three-level platform steel plate is equipped with three levels of safety railings.

[0016] Preferably, both the secondary steel pipe pile and the tertiary steel pipe pile are filled with concrete.

[0017] On the other hand, based on the aforementioned construction platform, this invention provides a method for constructing multi-stage bridges in hard rock areas of V-shaped valleys, comprising the following steps:

[0018] S1. Excavate and backfill the valley slope and bottom, level the site at the bottom of the first-level construction platform, and reserve the construction positions for the second and third-level construction platforms.

[0019] S2. Construction of the Level 1 construction platform:

[0020] S21. Carry out the construction of the frame foundation, reserve the pile drilling area according to the pile foundation location, pre-embed Bailey beam anchorage connectors according to the Bailey beam location, and pre-embed secondary steel pipe pile anchorage connectors and tertiary steel pipe pile anchorage connectors according to the secondary and tertiary steel pipe pile locations.

[0021] S22. Install Bailey beams. Bailey beams are assembled from standard segments and pergola, and then connected to the frame foundation through Bailey beam anchoring connectors.

[0022] S23. Install the distribution beams, which are evenly distributed on the top of the Bailey beams along the transverse direction;

[0023] S24. Lay a platform steel plate on top of the distribution beam;

[0024] Construction of S3 and Level 2 construction platforms:

[0025] S31. Construct a secondary L-shaped strip foundation. At the designed positions on the top of the left and right slopes, pour a secondary L-shaped strip foundation and pre-embed secondary load-bearing longitudinal beam anchorage connectors.

[0026] S32. Constructing secondary steel pipe piles: On the primary platform, use a crawler crane to erect the secondary steel pipe piles at the designed position on the side of the slope and connect them with the secondary steel pipe pile anchoring connectors pre-embedded on the primary construction platform. Then, process the secondary transverse connection system to connect the adjacent secondary steel pipe piles into a whole. At the same time, pour a certain height of concrete at the bottom of the secondary steel pipe piles.

[0027] S33. Arrange the secondary load-bearing beam on top of the secondary steel pipe pile, and fix the two together.

[0028] S34. Construct secondary load-bearing longitudinal beams. The secondary load-bearing longitudinal beams are evenly arranged between the secondary load-bearing beams and the secondary L-shaped strip foundations. One end of the secondary load-bearing longitudinal beam is connected to the secondary L-shaped strip foundation through the secondary load-bearing longitudinal beam anchoring connector, and the other end is connected to the secondary load-bearing beam.

[0029] S35. Construction of the secondary inclined connection system. The secondary inclined connection system adopts steel pipes welded into a truss structure, and then connects it to the secondary steel pipe piles and the secondary load-bearing longitudinal beams to form a whole.

[0030] S36. Construction of secondary distribution beams, with secondary distribution beams evenly distributed on the top of secondary load-bearing longitudinal beams;

[0031] S37. Secondary connection platform for pouring construction. The secondary connection platform is set at the top of the slope of the secondary construction platform, and its top elevation is consistent with the top elevation of the secondary distribution beam.

[0032] S38. Construction of the secondary platform steel plate: The secondary platform steel plate is laid on the secondary distribution beam and the secondary connecting platform.

[0033] S39. Secondary safety guardrails for construction: Secondary safety guardrails shall be installed at the edge of the open surface of the steel plate of the secondary platform;

[0034] S4. Construction of a Level 3 construction platform:

[0035] S41. Construct the three-level convex strip foundation and the three-level L-shaped strip foundation. Pour the three-level convex strip foundation and the three-level L-shaped strip foundation according to the design position, and pre-embed the three-level oblique connection system anchorage connectors and the three-level load-bearing longitudinal beam anchorage connectors respectively.

[0036] S42. Constructing Class III steel pipe piles: On the Class I platform, use a crawler crane to erect the Class III steel pipe piles at the designed position on the back slope and connect them with the Class III steel pipe pile anchoring connectors pre-embedded on the Class I construction platform. Then, process the Class III transverse connection system to connect the Class III steel pipe piles into a whole. At the same time, pour a certain height of concrete at the bottom inside the Class III steel pipe piles.

[0037] S43. Construct a third-level load-bearing beam, place the third-level load-bearing beam on top of the third-level steel pipe pile, and fix the two together.

[0038] S44. The three-level load-bearing longitudinal beams are evenly arranged between the three-level load-bearing beams and the three-level L-shaped strip foundations. One end of the three-level load-bearing longitudinal beam is fixedly connected to the three-level L-shaped strip foundation through the three-level load-bearing longitudinal beam anchoring connector, and the other end is fixedly connected to the three-level load-bearing beam.

[0039] S45. Construction of the three-level inclined connection system: The three-level construction platform inclined connection system adopts steel pipe welded into a truss structure, which is connected to the three-level steel pipe piles and the three-level load-bearing longitudinal beams to form a whole. At the same time, it is connected to the three-level convex strip foundation through the three-level inclined connection system anchoring connectors to form a whole.

[0040] S46. Construct the three-level distribution beams and evenly distribute them on the top of the three-level load-bearing longitudinal beams;

[0041] S47. Construct the third-level platform steel plate and lay the third-level platform steel plate on the third-level distribution beam;

[0042] S48. Three-level safety railings are installed at the edge of the open surface of the steel plate of the three-level platform.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0044] 1. The present invention provides a V-shaped multi-stage bridge construction platform in hard rock areas of river valleys, which adopts a frame foundation and steel pipe pile connection as the supporting column, which can avoid the problem of difficult steel pipe pile driving construction in hard rock areas, and save materials and construction time.

[0045] 2. The present invention provides a V-shaped multi-stage bridge construction platform in hard rock areas of river valleys. The steel pipe piles are filled with concrete, which can improve the rigidity of the steel pipe piles and the overall stability of the platform, and is beneficial to resisting the impact of water flow.

[0046] 3. The present invention provides a multi-level bridge construction platform in a V-shaped valley hard rock area. The platform is designed with three levels in the V-shaped valley, which makes full use of the terrain features, increases the construction area, and solves the problem of limited space in the valley area.

[0047] 4. The present invention provides a V-shaped multi-stage bridge construction platform in hard rock areas of river valleys. The platform steel pipe pile connection system and support structure are all prefabricated and assembled, which is convenient for installation and disassembly and can be reused. Attached Figure Description

[0048] Figure 1 A schematic diagram of the foundation layout of a multi-stage bridge construction platform in a V-shaped valley hard rock area is provided for an embodiment of the present invention.

[0049] Figure 2 A front structural schematic diagram of a multi-stage bridge construction platform in a V-shaped valley hard rock area provided in an embodiment of the present invention;

[0050] Figure 3 This invention provides a front view of the primary and secondary construction platforms of a multi-stage bridge construction platform in a V-shaped valley hard rock area, as shown in the embodiments of the present invention.

[0051] Figure 4 A schematic diagram of the side structure of a secondary construction platform of a multi-stage bridge construction platform in a V-shaped valley hard rock area provided in an embodiment of the present invention;

[0052] Figure 5 This invention provides a schematic diagram of the side structure of a three-stage construction platform for a multi-stage bridge construction platform in a V-shaped valley hard rock area.

[0053] Figure 6 A front view of the relevant parts of the secondary construction platform of a multi-stage bridge construction platform in a V-shaped valley hard rock area provided in an embodiment of the present invention;

[0054] Figure 7 A front view of the relevant parts of the first-stage construction platform of a multi-stage bridge construction platform in a V-shaped valley hard rock area provided in an embodiment of the present invention;

[0055] Figure 8 This is a side view of a portion of the primary construction platform of a multi-stage bridge construction platform in a V-shaped valley hard rock area, provided as an embodiment of the present invention.

[0056] The attached diagram lists the components represented by each number as follows:

[0057] 1. Primary construction platform; 2. Secondary construction platform; 3. Tertiary construction platform; 100. Frame foundation; 101. Bailey beam anchorage connector; 103. Bailey beam; 104. Pergola; 105. Distribution beam; 106. Platform steel plate; 107. Pile foundation location; 108. Drilling area; 201. Secondary steel pipe pile; 202. Secondary transverse connection system; 203. Secondary oblique connection system; 204. Secondary load-bearing beam; 205. Secondary load-bearing longitudinal beam; 206. Secondary load-bearing longitudinal beam anchorage connector; 207. Secondary L-shaped strip foundation; 208. Secondary distribution beam; 209. Secondary platform steel plate 210. Plate; 211. Secondary safety railing; 301. Secondary connecting platform; 302. Tertiary steel pipe pile; 303. Tertiary transverse connection system; 304. Tertiary oblique connection system; 305. Tertiary load-bearing beam; 306. Tertiary load-bearing longitudinal beam; 307. Tertiary convex strip foundation; 308. Tertiary oblique connection system anchorage connector; 309. Tertiary L-shaped strip foundation; 310. Tertiary load-bearing longitudinal beam anchorage connector; 311. Tertiary distribution beam; 312. Tertiary platform steel plate; 1021. Tertiary safety railing; 1022. Tertiary steel pipe pile anchorage connector. Detailed Implementation

[0058] The present invention will now be described in further detail with reference to specific embodiments, so that those skilled in the art can more clearly understand the present invention.

[0059] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integrally formed structures. Those skilled in the art can understand the specific meaning of these terms in this patent based on the specific circumstances.

[0060] V-shaped valleys typically have a relatively flat bottom, with slopes on the left and right sides, as well as a slope on the back side, which may be the highest. When constructing in a V-shaped valley, it is necessary to set up construction platforms at least on the valley bottom and the left and right slopes. However, conventional construction platforms are difficult to install, steel pipe piles are difficult to drive, the support is not stable enough, and the construction site is too small to meet the usage requirements.

[0061] To solve the above problems, such as Figure 1-8 As shown, this embodiment provides a multi-stage bridge construction platform in a V-shaped valley hard rock area, including a primary construction platform 1 set at the bottom of the valley and a secondary construction platform 2 set on the left and right slopes of the valley.

[0062] In this embodiment, the primary construction platform 1 is located at the pier cap, in a flat area at the bottom of the valley. This low-level construction platform allows for the movement and operation of equipment such as rotary drilling rigs during pile foundation construction. The secondary construction platform 2 is located on the left and right slopes of the valley. This high-level platform connects to mountain roads and allows for the storage and transportation of materials, as well as the movement and operation of construction vehicles such as concrete pumps and concrete mixer trucks during construction.

[0063] Specifically, such as Figure 7-8 As shown, the primary construction platform 1 includes a frame foundation 100, Bailey beams 103, distribution beams 105, and platform steel plate 106. The frame foundation 100 is fixedly installed at the bottom of the valley. The frame foundation 100 has a pre-reserved drilling area 108 according to the pile foundation location 107. Multiple Bailey beam anchoring connectors 101 are pre-embedded on the upper surface of the frame foundation 100. The Bailey beams 103 are fixedly installed on the frame foundation 100 through the Bailey beam anchoring connectors 101. Adjacent Bailey beams 103 are fixedly connected by a pergola 104. The distribution beams 105 are fixedly installed on the Bailey beams 103. The platform steel plate 106 is fixedly laid on the distribution beams 105.

[0064] The frame foundation 100 can be made of reinforced concrete. The dimensions of the frame foundation 100 are designed according to the positions of the secondary steel pipe piles 201 and the tertiary steel pipe piles 301, and the drilling area 108 is reserved at the pile foundation position.

[0065] The Bailey beam anchoring connector 101 can be installed at the longitudinal and transverse nodes of the frame foundation 100.

[0066] The drilling zone 108 can be arranged in a matrix, and the Bailey beam anchoring connector 101 can also be arranged in a matrix.

[0067] like Figure 7 , 8 As shown, the Bailey beam 103 can be formed by assembling single standard segments. The Bailey beam 103 is connected laterally and at its ends by the flower rack 104, and is erected longitudinally at the support points of the frame foundation 100 (the distribution positions of the Bailey beam anchoring connectors 101) to form a load-bearing main beam.

[0068] The distribution beam 105 can be a double-I-beam structure, the distribution beam 105 can be perpendicular to the Bailey beam 103, and the distribution beam 105 is erected on top of the Bailey beam 103.

[0069] The platform steel plate 106 is erected on top of the distribution beam 105, and the two can be fixed by welding.

[0070] Specifically, the secondary construction platform 2 includes secondary steel pipe piles 201, secondary load-bearing beams 204, secondary load-bearing longitudinal beams 205, secondary L-shaped strip foundations 207, secondary distribution beams 208, and secondary platform steel plates 209. The upper surface of the frame foundation 100 is pre-embedded with secondary steel pipe pile anchoring connectors 1021. The secondary steel pipe piles 201 are fixedly installed on the frame foundation 100 through the secondary steel pipe pile anchoring connectors 1021. The secondary load-bearing beams 204 are fixedly installed on the top of the secondary steel pipe piles 201. The secondary L-shaped strip foundations... The foundation 207 is fixedly installed on the top of both sides of the slope. The upper surface of the secondary L-shaped strip foundation 207 is pre-embedded with a secondary load-bearing longitudinal beam anchor connector 206. One end of the secondary load-bearing longitudinal beam 205 is fixedly connected to the secondary L-shaped strip foundation 207 through the secondary load-bearing longitudinal beam anchor connector 206, and the other end of the secondary load-bearing longitudinal beam 205 is fixedly connected to the secondary load-bearing beam 204. The secondary distribution beam 208 is fixedly installed on the secondary load-bearing longitudinal beam 205, and the secondary platform steel plate 209 is fixedly laid on the secondary distribution beam 208.

[0071] A secondary construction platform 2 can be set up on each of the left and right slopes of the valley.

[0072] like Figure 3 As shown, the secondary steel pipe pile anchoring connectors 1021 are pre-embedded on both the left and right sides of the upper surface of the frame foundation 100, so as to facilitate the construction of the secondary construction platform 2 on the left and right slopes of the valley.

[0073] like Figure 4 As shown, the secondary construction platform 2 may include three secondary steel pipe piles 201. Three secondary steel pipe pile anchoring connectors 1021 are pre-embedded on each of the left and right sides of the upper surface of the frame foundation 100. The bottom of the secondary steel pipe pile 201 is connected to the secondary steel pipe pile anchoring connector 1021 to form a whole, so that the secondary steel pipe pile 201 and the frame foundation 100 are connected to form a whole, ensuring the stability of the platform.

[0074] The secondary steel pipe pile 201 is internally filled with concrete. Similar to a composite steel pipe pile structure, this improves the rigidity of the column and the overall stability of the platform, allowing the secondary steel pipe pile 201 to withstand greater and stronger water flow impacts.

[0075] The secondary L-shaped strip foundation 207 can be a reinforced concrete structure and is set at the apex of the slope.

[0076] The secondary load-bearing beam 204 can be a double-I-beam structure.

[0077] The secondary load-bearing longitudinal beam 205 can be a double-I-beam structure.

[0078] The secondary load-bearing longitudinal beam 205 can be perpendicular to the secondary load-bearing beam 204. One end of the secondary load-bearing longitudinal beam 205 is connected to the secondary L-shaped strip foundation 207 through the secondary load-bearing longitudinal beam anchoring connector 206. The other end of the secondary load-bearing longitudinal beam 205 can be welded to the secondary load-bearing beam 204 to form an integral structure.

[0079] The distribution beam 208 can be a double-I-beam structure, evenly spaced on the secondary load-bearing longitudinal beam 205.

[0080] The secondary platform steel plate 209 and the distribution beam 208 can be fixed by welding.

[0081] In this embodiment, the secondary construction platform 2 further includes a secondary transverse connection system 202, through which adjacent secondary steel pipe piles 201 are fixedly connected. The secondary transverse connection system 202 is a truss structure welded from steel pipes. The three secondary steel pipe piles 201 can be connected by the secondary transverse connection system 202 to form a whole, making the structure more stable.

[0082] In this embodiment, as Figure 6 As shown, the secondary construction platform 2 also includes a secondary inclined connecting system 203, through which the secondary steel pipe piles 201 are fixedly connected to the secondary load-bearing longitudinal beam 205. The secondary inclined connecting system 203 can be constructed of welded steel pipes into a truss structure, with three rows arranged along the slope direction, each row corresponding to one secondary steel pipe pile 201. The secondary steel pipe piles 201 can be connected to the secondary load-bearing longitudinal beam 205 through the secondary inclined connecting system 203 to form a whole, making the structure of the secondary load-bearing longitudinal beam 205 more stable.

[0083] In this embodiment, a secondary safety guardrail 210 is provided on the secondary platform steel plate 209, and a connecting platform 211 for smoothing the road is provided on the side of the secondary platform steel plate 209 facing the slope.

[0084] The secondary safety guardrail 210 can be welded and fixed to the secondary platform steel plate 209.

[0085] The connecting platform 211 can be a reinforced concrete structure and is set on the top of the slope of the secondary construction platform. The connecting platform 211 can be connected to the steel plate 209 of the secondary platform to smooth the road.

[0086] In addition, to further expand the workable area, a three-tiered construction platform can be set up on the back slope of the valley, with the highest platform being the construction platform. This platform can be used for storing and transporting materials and for the movement and operation of construction vehicles such as concrete pumps and concrete mixer trucks during construction.

[0087] Specifically, in this embodiment, the multi-level bridge construction platform further includes a third-level construction platform 3 set on the back slope of the valley. The third-level construction platform 3 includes third-level steel pipe piles 301, third-level load-bearing beams 304, third-level load-bearing longitudinal beams 305, third-level L-shaped strip foundations 308, third-level distribution beams 310, and third-level platform steel plates 311. The upper surface of the frame foundation 100 is pre-embedded with third-level steel pipe pile anchoring connectors 1022. The third-level steel pipe piles 301 are fixedly installed on the frame foundation 100 through the third-level steel pipe pile anchoring connectors 1022. The third-level load-bearing beams 304 are fixedly installed on the third-level platform. At the top of the first-level steel pipe pile 301, the third-level L-shaped strip foundation 308 is fixedly installed on the top of the back slope. The upper surface of the third-level L-shaped strip foundation 308 is pre-embedded with a third-level load-bearing longitudinal beam anchoring connector 309. One end of the third-level load-bearing longitudinal beam 305 is fixedly connected to the third-level L-shaped strip foundation 308 through the third-level load-bearing longitudinal beam anchoring connector 309, and the other end of the third-level load-bearing longitudinal beam 305 is fixedly connected to the third-level load-bearing beam 304. The third-level distribution beam 310 is fixedly installed on the third-level load-bearing longitudinal beam 305, and the third-level platform steel plate 311 is fixedly laid on the third-level distribution beam 310.

[0088] The third-level construction platform 3 is located at the top of the slope on the back side of the valley, serving as a high-level construction platform. It may include seven third-level steel pipe piles 301. Seven anchoring connectors 1022 for the third-level steel pipe piles are pre-embedded on the back side of the upper surface of the frame foundation 100. The bottom of each third-level steel pipe pile 301 is connected to the anchoring connector 1022 to form a whole, ensuring the stability of the platform by integrating the third-level steel pipe piles 301 with the frame foundation 100.

[0089] The third-level steel pipe pile 301 is internally filled with concrete. Similar to a composite steel pipe pile structure, this improves the rigidity of the column and the overall stability of the platform, enabling the third-level steel pipe pile 301 to withstand greater and stronger water flow impacts.

[0090] The three-level L-shaped strip foundation 308 can be a reinforced concrete structure, set at the top of the slope, and a three-level load-bearing longitudinal beam anchoring connector 309 is set on the top surface.

[0091] The third-level load-bearing beam 304 can be a double-I-beam structure. The third-level load-bearing longitudinal beam 305 can also be a double-I-beam structure.

[0092] One end of the third-level load-bearing longitudinal beam 305 is connected to the third-level L-shaped strip foundation 308 through the third-level load-bearing longitudinal beam anchoring connector 309, and the other end can be fixed to the third-level load-bearing beam 304 by welding to form an integral support.

[0093] The tertiary distribution beam 310 can be a double-I-beam structure, evenly spaced on the tertiary load-bearing longitudinal beam 305. The tertiary platform steel plate 311 can be welded and fixed to the tertiary distribution beam 310.

[0094] The three-level safety guardrail 312 can be welded and fixed to the three-level platform steel plate 311.

[0095] In this embodiment, please refer again. Figure 2 The three-level construction platform 3 also includes a three-level transverse connection system 302, through which adjacent three-level steel pipe piles 301 are connected. The seven three-level steel pipe piles 301 are connected into a whole through the three-level transverse connection system 302.

[0096] In this embodiment, as Figure 5 As shown, the three-level construction platform 3 also includes a three-level inclined connection system 303 and a three-level convex strip foundation 306. The three-level convex strip foundation 306 is fixedly installed at the midpoint of the back slope. The upper surface and side surface of the three-level convex strip foundation 306 are pre-embedded with three-level inclined connection system anchoring connectors 307. The three-level inclined connection system 303 is simultaneously fixedly connected to the three-level steel pipe pile 301, the three-level load-bearing longitudinal beam 305, and the three-level inclined connection system anchoring connectors 307.

[0097] The three-level inclined connection system 303 can be made of steel pipe welded into a truss structure, with seven of them. The seven three-level inclined connection systems 303 correspond one-to-one with the seven three-level steel pipe piles 301.

[0098] The three-level convex strip foundation 306 can be a reinforced concrete structure, set at the midpoint of the slope, with a total of seven foundations. Each of the seven three-level convex strip foundations 306 corresponds one-to-one with one of the seven three-level oblique connection anchoring connectors 307.

[0099] On the other hand, based on the aforementioned construction platform, this invention provides a method for constructing multi-stage bridges in hard rock areas of V-shaped valleys, comprising the following steps:

[0100] S1. Excavate and backfill the valley slope and bottom, level the site at the bottom of the first-level construction platform, and reserve the construction positions for the second and third-level construction platforms.

[0101] Construction of S2, Level 1 Construction Platform 1:

[0102] S21. Carry out the construction of the frame foundation 100, reserve the pile drilling area 108 according to the pile foundation location 107, pre-embed the Bailey beam anchoring connector 101 according to the Bailey beam 103 location, and pre-embed the secondary steel pipe pile anchoring connector 1021 and the tertiary steel pipe pile anchoring connector 1022 according to the secondary and tertiary steel pipe pile locations.

[0103] S22. Install Bailey beam 103. Bailey beam 103 is assembled from standard segments and flower rack 104, and then connected to frame foundation 100 through Bailey beam anchoring connector 101.

[0104] S23. Install the distribution beam 105, which is evenly distributed on the top of the Bailey beam 103 in the transverse direction.

[0105] S24. Lay a platform steel plate 106 on top of the distribution beam 105;

[0106] Construction of S3 and Level 2 construction platform 2:

[0107] S31. Construct a secondary L-shaped strip foundation 207. At the designed position at the top of the left and right slopes, pour a secondary L-shaped strip foundation 207 and pre-embed a secondary load-bearing longitudinal beam anchoring connector 206.

[0108] S32. Construct secondary steel pipe piles 201. On the primary platform, use a crawler crane to erect the secondary steel pipe piles 201 at the designed position on the side of the slope and connect them with the secondary steel pipe pile anchoring connectors 1021 pre-embedded on the primary construction platform. Then process the secondary transverse connection system 202 to connect the adjacent secondary steel pipe piles 201 into a whole. At the same time, pour a certain height of concrete at the bottom inside the secondary steel pipe piles 201.

[0109] S33. Arrange the secondary load-bearing beam 204 on top of the secondary steel pipe pile 201, and fix the two together.

[0110] S34. Construct secondary load-bearing longitudinal beams 205. The secondary load-bearing longitudinal beams 205 are evenly arranged between the secondary load-bearing beams 204 and the secondary L-shaped strip foundations 207. One end of the secondary load-bearing longitudinal beams 205 is connected to the secondary L-shaped strip foundations 207 through the secondary load-bearing longitudinal beam anchoring connectors 206, and the other end is connected to the secondary load-bearing beams 204.

[0111] S35. Construction of the secondary inclined connection system 203. The secondary inclined connection system 203 is made of steel pipe welded into a truss structure, and then connected to the secondary steel pipe pile 201 and the secondary load-bearing longitudinal beam 205 to form a whole.

[0112] S36, Construction of secondary distribution beam 208, the secondary distribution beam 208 is evenly arranged on the top of the secondary load-bearing longitudinal beam 205;

[0113] S37. Secondary connection platform 211 for pouring construction. The secondary connection platform 211 is set at the top of the slope of the secondary construction platform, and its top elevation is consistent with the top elevation of the secondary distribution beam 208.

[0114] S38, Construction of secondary platform steel plate 209, laying the secondary platform steel plate 209 on the secondary distribution beam 208 and the secondary connecting platform 211;

[0115] S39, Construction secondary safety guardrail 210, a secondary safety guardrail 210 shall be installed at the edge of the open surface of the secondary platform steel plate 209;

[0116] Construction of S4, Level 3 Construction Platform 3:

[0117] S41. Construct the three-level convex strip foundation 306 and the three-level L-shaped strip foundation 308. Pour the three-level convex strip foundation 306 and the three-level L-shaped strip foundation 308 at the design position. Pre-embed the three-level oblique connection system anchoring connector 307 and the three-level load-bearing longitudinal beam anchoring connector 309 respectively.

[0118] S42. Constructing the Class III steel pipe pile 301: On the Class I platform, the Class III steel pipe pile 301 is erected at the designed position on the back slope using a crawler crane and connected to the Class III steel pipe pile anchoring connector 1022 pre-embedded on the Class I construction platform. Then, the Class III transverse connection system 302 is processed to connect the Class III steel pipe pile 301 into a whole. At the same time, a certain height of concrete is poured into the bottom of the Class III steel pipe pile 301.

[0119] S43. Construct the third-level load-bearing beam 304, place the third-level load-bearing beam 304 on top of the third-level steel pipe pile 301, and fix the two together.

[0120] S44. The three-level load-bearing longitudinal beams 305 are evenly arranged between the three-level load-bearing beams 304 and the three-level L-shaped strip foundations 308. One end of the three-level load-bearing longitudinal beams 305 is fixedly connected to the three-level L-shaped strip foundations 308 through the three-level load-bearing longitudinal beam anchoring connectors 309, and the other end is fixedly connected to the three-level load-bearing beams 304.

[0121] S45, Construction Level 3 Inclined Connection System 303, The Level 3 Construction Platform Inclined Connection System (303) is made of steel pipe welded into a truss structure, which is connected to Level 3 steel pipe pile 301 and Level 3 load-bearing longitudinal beam 305 respectively to form a whole, and is connected to Level 3 convex strip foundation 306 through Level 3 Inclined Connection System Anchor Connector 307 to form a whole.

[0122] S46. Construct the third-level distribution beam 310 and evenly distribute it on the top of the third-level load-bearing longitudinal beam 305.

[0123] S47. Construct the third-level platform steel plate 311 and lay the third-level platform steel plate 311 on the third-level distribution beam 310;

[0124] S48. Construction Level 3 Safety Guardrail 312: Level 3 safety guardrail 312 shall be installed at the edge of the open surface of the Level 3 platform steel plate 311.

[0125] The mechanisms, components, and parts not specifically described in this invention are all existing structures in the prior art and can be purchased directly from the market.

[0126] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-stage bridge construction platform for V-shaped river valley hard rock areas, characterized in that, It includes a primary construction platform (1) set at the bottom of the valley and a secondary construction platform (2) set on the left and right slopes of the valley; The primary construction platform (1) includes a frame foundation (100), Bailey beams (103), distribution beams (105), and a platform steel plate (106). The frame foundation (100) is fixedly installed at the bottom of the valley. The frame foundation (100) has a pre-reserved drilling area (108) according to the pile foundation location (107). Bailey beam anchoring connectors (101) are pre-embedded on the upper surface of the frame foundation (100). The Bailey beams (103) are fixedly installed on the frame foundation (100) through the Bailey beam anchoring connectors (101). Adjacent Bailey beams (103) are fixedly connected by a pergola (104). The distribution beams (105) are fixedly installed on the Bailey beams (103). The platform steel plate (106) is fixedly laid on the distribution beams (105). The secondary construction platform (2) includes secondary steel pipe piles (201), secondary load-bearing beams (204), secondary load-bearing longitudinal beams (205), secondary L-shaped strip foundations (207), secondary distribution beams (208), and secondary platform steel plates (209). The upper surface of the frame foundation (100) is pre-embedded with secondary steel pipe pile anchoring connectors (1021). The secondary steel pipe piles (201) are fixedly installed on the frame foundation (100) through the secondary steel pipe pile anchoring connectors (1021). The secondary load-bearing beams (204) are fixedly installed at the top of the secondary steel pipe piles (201). The secondary L-shaped strip foundations... The foundation (207) is fixedly installed on the top of the two side slopes. The upper surface of the secondary L-shaped strip foundation (207) is pre-embedded with a secondary load-bearing longitudinal beam anchor connector (206). One end of the secondary load-bearing longitudinal beam (205) is fixedly connected to the secondary L-shaped strip foundation (207) through the secondary load-bearing longitudinal beam anchor connector (206). The other end of the secondary load-bearing longitudinal beam (205) is fixedly connected to the secondary load-bearing beam (204). The secondary distribution beam (208) is fixedly installed on the secondary load-bearing longitudinal beam (205). The secondary platform steel plate (209) is fixedly laid on the secondary distribution beam (208).

2. The multi-stage bridge construction platform for V-shaped valley hard rock areas according to claim 1, characterized in that, The secondary construction platform (2) also includes a secondary transverse connection system (202), and adjacent secondary steel pipe piles (201) are fixedly connected through the secondary transverse connection system (202).

3. The multi-stage bridge construction platform for V-shaped valley hard rock areas according to claim 1, characterized in that, The secondary construction platform (2) also includes a secondary inclined connection system (203), through which the secondary steel pipe pile (201) is fixedly connected to the secondary load-bearing longitudinal beam (205).

4. The multi-stage bridge construction platform for V-shaped valley hard rock areas according to claim 1, characterized in that, The secondary platform steel plate (209) is provided with a secondary safety guardrail (210), and the secondary platform steel plate (209) is provided with a connecting platform (211) for smoothing the road on the side facing the slope.

5. A multi-stage bridge construction platform for V-shaped valley hard rock areas according to claim 1, characterized in that, The multi-level bridge construction platform also includes a third-level construction platform (3) set on the back slope of the valley. The third-level construction platform (3) includes a third-level steel pipe pile (301), a third-level load-bearing beam (304), a third-level load-bearing longitudinal beam (305), a third-level L-shaped strip foundation (308), a third-level distribution beam (310), and a third-level platform steel plate (311). The upper surface of the frame foundation (100) is pre-embedded with a third-level steel pipe pile anchor connector (1022). The third-level steel pipe pile (301) is fixedly installed on the frame foundation (100) through the third-level steel pipe pile anchor connector (1022). The third-level load-bearing beam (304) is fixedly installed on the third-level steel pipe pile. (301) At the top, the three-level L-shaped strip foundation (308) is fixedly installed on the top of the back slope. The upper surface of the three-level L-shaped strip foundation (308) is pre-embedded with a three-level load-bearing longitudinal beam anchor connector (309). One end of the three-level load-bearing longitudinal beam (305) is fixedly connected to the three-level L-shaped strip foundation (308) through the three-level load-bearing longitudinal beam anchor connector (309). The other end of the three-level load-bearing longitudinal beam (305) is fixedly connected to the three-level load-bearing beam (304). The three-level distribution beam (310) is fixedly installed on the three-level load-bearing longitudinal beam (305). The three-level platform steel plate (311) is fixedly laid on the three-level distribution beam (310).

6. A multi-stage bridge construction platform for V-shaped valley hard rock areas according to claim 5, characterized in that, The three-level construction platform (3) also includes a three-level transverse connection system (302), and adjacent three-level steel pipe piles (301) are fixedly connected through the three-level transverse connection system (302).

7. A multi-stage bridge construction platform for V-shaped valley hard rock areas according to claim 5, characterized in that, The three-level construction platform (3) also includes a three-level inclined connection system (303) and a three-level convex strip foundation (306). The three-level convex strip foundation (306) is fixedly set at the midpoint of the back slope. The three-level inclined connection system anchoring connectors (307) are pre-embedded on the upper surface and side surface of the three-level convex strip foundation (306). The three-level inclined connection system (303) is simultaneously fixedly connected to the three-level steel pipe pile (301), the three-level load-bearing longitudinal beam (305), and the three-level inclined connection system anchoring connectors (307).

8. A multi-stage bridge construction platform for V-shaped valley hard rock areas according to claim 5, characterized in that, The three-level platform steel plate (311) is equipped with three-level safety railings (312).

9. A multi-stage bridge construction platform for V-shaped valley hard rock areas according to claim 5, characterized in that, Both the secondary steel pipe pile (201) and the tertiary steel pipe pile (301) are filled with concrete.

10. A construction method for multi-stage bridges in hard rock areas of V-shaped valleys as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Excavate and backfill the valley slope and bottom, level the site at the bottom of the first-level construction platform, and reserve the construction positions for the second and third-level construction platforms. S2, Construction of Level 1 Construction Platform (1): S21. Carry out the construction of the frame foundation (100), reserve the pile drilling area (108) according to the pile foundation location (107), pre-embed Bailey beam anchoring connectors (101) according to the Bailey beam (103) location, and pre-embed secondary steel pipe pile anchoring connectors (1021) and tertiary steel pipe pile anchoring connectors (1022) according to the secondary and tertiary steel pipe pile locations. S22. Install Bailey beams (103). Bailey beams (103) are assembled from standard segments and flower racks (104) and then connected to the frame foundation (100) through Bailey beam anchoring connectors (101). S23. Install the distribution beam (105), which is evenly distributed on the top of the Bailey beam (103); S24. Lay a platform steel plate (106) on top of the distribution beam (105); Construction of S3, Level 2 construction platform (2): S31. Construct a secondary L-shaped strip foundation (207). At the designed position on the top of the left and right slopes, pour a secondary L-shaped strip foundation (207) and pre-embed a secondary load-bearing longitudinal beam anchor connection (206). S32. Construct secondary steel pipe piles (201). On the primary platform, use a crawler crane to erect the secondary steel pipe piles (201) at the designed positions on the left and right slopes. Connect them with the secondary steel pipe pile anchoring connectors (1021) pre-embedded on the primary construction platform. Then process the secondary transverse connection system (202) to connect the adjacent secondary steel pipe piles (201) into a whole. At the same time, pour a certain height of concrete at the bottom of the secondary steel pipe piles (201). S33. Arrange the secondary load-bearing beam (204) on top of the secondary steel pipe pile (201) and fix the two together; S34. Construct secondary load-bearing longitudinal beams (205). The secondary load-bearing longitudinal beams (205) are evenly arranged between the secondary load-bearing beams (204) and the secondary L-shaped strip foundations (207). One end of the secondary load-bearing longitudinal beams (205) is connected to the secondary L-shaped strip foundations (207) through the secondary load-bearing longitudinal beam anchoring connectors (206), and the other end is connected to the secondary load-bearing beams (204). S35, Construction of the secondary inclined connection system (203), the secondary inclined connection system (203) adopts a truss structure, and is then connected to the secondary steel pipe pile (201) and the secondary load-bearing longitudinal beam (205) to form a whole; S36, Construction of secondary distribution beams (208), the secondary distribution beams (208) are evenly arranged on the top of the secondary load-bearing longitudinal beams (205); S37, Secondary connection platform (211) for pouring construction. The secondary connection platform (211) is set at the top of the slope of the secondary construction platform, and its top elevation is consistent with the top elevation of the secondary distribution beam (208). S38, Construction of secondary platform steel plate (209), laying the secondary platform steel plate (209) on the secondary distribution beam (208) and the secondary connecting platform (211); S39. Construction secondary safety guardrail (210): A secondary safety guardrail (210) shall be installed at the edge of the open surface of the secondary platform steel plate (209); S4, Construction of Level 3 Construction Platform (3): S41. Construct the three-level convex strip foundation (306) and the three-level L-shaped strip foundation (308). Pour the three-level convex strip foundation (306) and the three-level L-shaped strip foundation (308) at the design position. Pre-embed the three-level oblique connection system anchor connector (307) and the three-level load-bearing longitudinal beam anchor connector (309) respectively. S42. Constructing the Class III steel pipe piles (301): On the Class I platform, the Class III steel pipe piles (301) are erected at the designed position on the back slope using a crawler crane. They are then connected to the Class III steel pipe pile anchoring connectors (1022) pre-embedded on the Class I construction platform. The Class III transverse connection system (302) is then processed to connect the Class III steel pipe piles (301) into a whole. At the same time, a certain height of concrete is poured into the bottom of the Class III steel pipe piles (301). S43. Construct a third-level load-bearing beam (304), place the third-level load-bearing beam (304) on top of the third-level steel pipe pile (301), and fix the two together. S44. The three-level load-bearing longitudinal beams (305) are evenly arranged between the three-level load-bearing beams (304) and the three-level L-shaped strip foundations (308). One end of the three-level load-bearing longitudinal beams (305) is fixedly connected to the three-level L-shaped strip foundations (308) through the three-level load-bearing longitudinal beam anchoring connectors (309), and the other end is fixedly connected to the three-level load-bearing beams (304). S45, Construction Level 3 Inclined Connection System (303), the Level 3 construction platform inclined connection system (303) adopts a truss structure, and is connected to the Level 3 steel pipe pile (301) and Level 3 load-bearing longitudinal beam (305) to form a whole. At the same time, it is connected to the Level 3 convex strip foundation (306) to form a whole through the Level 3 inclined connection system anchoring connector (307). S46. Construct the three-level distribution beam (310) and evenly distribute it on the top of the three-level load-bearing longitudinal beam (305); S47. Construction of the third-level platform steel plate (311): The third-level platform steel plate (311) is laid on the third-level distribution beam (310); S48. Construction three-level safety guardrail (312): A three-level safety guardrail (312) is installed at the edge of the open surface of the three-level platform steel plate (311).

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