CN115627698A - V-shaped valley hard rock area multistage bridge construction platform and construction method thereof - Google Patents

Abstract

The invention belongs to the technical field of construction platforms for hard rock areas of V-shaped valleys, and provides a construction platform for a multi-level bridge in the hard rock areas of the V-shaped valleys and a construction method thereof, wherein the construction platform comprises a first-level construction platform arranged at the bottom of the valley and second-level construction platforms arranged on side slopes on the left side and the right side of the valley; the first-stage construction platform comprises a frame type foundation, a Bailey beam, a distribution beam and a platform steel plate; the second-level construction platform comprises a second-level steel pipe pile, a second-level bearing beam, a second-level bearing longitudinal beam, a second-level L-shaped strip foundation, a second-level distribution beam and a second-level platform steel plate. The construction platform adopts the form that the frame type foundation is connected with the steel pipe piles as the supporting upright posts, can avoid the problem of difficult steel pipe pile inserting and driving construction in hard rock areas, and saves materials and construction period. The concrete is filled in the steel pipe pile, so that the rigidity and the integral stability of the platform of the steel pipe pile can be improved, and the steel pipe pile is favorable for bearing water flow impact.

Description

V-shaped valley hard rock area multistage bridge construction platform and construction method thereof

Technical Field

The invention belongs to the technical field of construction platforms in V-shaped valley hard rock areas, and particularly relates to a V-shaped valley hard rock area multistage bridge construction platform and a construction method thereof.

Background

With the rapid development of traffic infrastructures in China, large-span bridges are gradually built in valley and mountain areas, bridge construction platforms are important auxiliary structures in construction, play a role in connecting roads, carrying heavy machines and tools, processing sites of structures and the like, and are widely applied to the construction of important structures such as bridge foundations, pier columns, cable towers and the like.

A conventional construction platform usually adopts a door type steel pipe pile foundation and a Bailey beam steel structure, firstly, a steel casing is driven into a soil body by adopting a vibration hammer, then the steel casing is connected into a whole, and then the Bailey beam is arranged on the top of the steel casing to form the construction platform. The platform is simple in structure and convenient to construct, is a single construction platform, and is usually applied to areas with wide terrain and small gradient.

For V type valley hard rock area, have characteristics such as the slope height is steep, the place is narrow and small, the rivers impact is big, the stratum is hard, adopt conventional construction platform scheme to have following construction problems: 1. the construction platform support stands on a steep side slope, the design and installation difficulty of the support is high, and the safety risk is high; 2. the rock stratum has high strength, and the steel pipe pile is adopted as a foundation, so that the inserting and beating construction is difficult; 3. the support stands on a steep side slope, is large in erection height, is obviously influenced by water flow impact, and has high structural stress stability requirement. 4. The construction site is narrow and small, and the space requirements of construction equipment, material and material approach and the like cannot be met by adopting a conventional single platform.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a V-shaped valley hard rock area multistage bridge construction platform, which effectively solves the problems that the conventional construction platform adopted in the V-shaped valley hard rock area in the prior art is high in installation difficulty, difficult to insert and beat steel pipe piles, high in support stability requirement and narrow in construction site.

In order to achieve the purpose, the invention adopts the following technical scheme: on one hand, the invention provides a V-shaped valley hard rock area multistage bridge construction platform, which comprises a first-stage construction platform arranged at the bottom of a valley and second-stage construction platforms arranged on side slopes on the left side and the right side of the valley;

the primary construction platform comprises a frame type foundation, a Bailey beam, a distribution beam and a platform steel plate, wherein the frame type foundation is fixedly arranged at the bottom of a valley, a drilling area is reserved on the frame type foundation according to the position of a pile foundation, a plurality of Bailey beam anchoring connecting pieces are pre-embedded on the upper surface of the frame type foundation, the Bailey beam is fixedly arranged on the frame type foundation through the Bailey beam anchoring connecting pieces, the adjacent Bailey beams are fixedly connected through a flower stand, the distribution beam is fixedly arranged on the Bailey beam, and the platform steel plate is fixedly laid on the distribution beam;

the second-level construction platform comprises a second-level steel pipe pile, a second-level bearing beam, a second-level bearing longitudinal beam, a second-level L-shaped strip foundation, a second-level distribution beam and a second-level platform steel plate, wherein a second-level steel pipe pile anchoring connecting piece is pre-embedded in the upper surface of the frame-shaped foundation, the second-level steel pipe pile passes through the second-level steel pipe pile anchoring connecting piece and is fixedly installed on the frame-shaped foundation, the second-level bearing beam is fixedly installed at the top end of the second-level steel pipe pile, the second-level L-shaped strip foundation is fixedly arranged at the tops of side slopes on two sides, a second-level bearing longitudinal beam anchoring connecting piece is pre-embedded in the upper surface of the second-level L-shaped strip foundation, one end of the second-level bearing longitudinal beam is fixedly overlapped on the second-level L-shaped strip foundation, the other end of the second-level bearing longitudinal beam is fixedly overlapped on the second-level bearing beam, the second-level distribution beam is fixedly installed on the second-level bearing longitudinal beam, and the second-level platform steel plate is fixedly laid on the second-level distribution beam.

Preferably, the secondary construction platform further comprises a secondary transverse connection system, and the adjacent secondary steel pipe piles are fixedly connected through the secondary transverse connection system.

Preferably, the second-level construction platform further comprises a second-level oblique connecting system, and the second-level steel pipe pile is fixedly connected with the second-level bearing longitudinal beam through the second-level oblique connecting system.

Preferably, the second-level platform steel plate is provided with a second-level safety guardrail, and a connecting pedestal for smoothing roads is arranged on one side, facing the side slope, of the second-level platform steel plate.

Preferably, the multistage bridge construction platform further comprises a third-stage construction platform arranged on a slope on the back side of a valley, the third-stage construction platform comprises a third-stage steel pipe pile, a third-stage load-bearing beam, a third-stage load-bearing longitudinal beam, a third-stage L-shaped strip foundation, a third-stage distribution beam and a third-stage platform steel plate, a third-stage steel pipe pile anchoring connector is pre-embedded in the upper surface of the frame-shaped foundation, the third-stage steel pipe pile is fixedly installed on the frame-shaped foundation through the third-stage steel pipe pile anchoring connector, the third-stage load-bearing beam is fixedly installed at the top end of the third-stage steel pipe pile, the third-stage L-shaped strip foundation is fixedly arranged at the top of the slope on the back side, a third-stage load-bearing longitudinal beam anchoring connector is pre-embedded in the upper surface of the third-stage L-shaped strip foundation, one end of the third-stage load-bearing longitudinal beam is fixedly lapped on the third-stage L-shaped strip foundation through the third-stage load-bearing longitudinal beam anchoring connector, the other end of the third-stage load-bearing longitudinal beam is fixedly lapped on the third-stage load-bearing longitudinal beam, the third-stage distribution beam is fixedly arranged on the third-stage distribution steel plate.

Preferably, the three-level construction platform further comprises three levels of transverse connecting systems, and the adjacent three levels of steel pipe piles are fixedly connected through the three levels of transverse connecting systems.

Preferably, the third-level construction platform further comprises a third-level oblique connection system and a third-level convex strip-shaped foundation, the third-level convex strip-shaped foundation is fixedly arranged at the midpoint of the back side slope, third-level oblique connection system anchoring connection pieces are pre-embedded in the upper surface and the side surface of the third-level convex strip-shaped foundation, and the third-level oblique connection system is fixedly connected with the third-level steel pipe pile, the third-level bearing longitudinal beam and the third-level oblique connection system anchoring connection pieces at the same time.

Preferably, a third-level safety guardrail is arranged on the third-level platform steel plate.

Preferably, concrete is poured into both the secondary steel pipe pile and the tertiary steel pipe pile.

On the other hand, based on the construction platform, the invention provides a construction method of a multi-level bridge in a V-shaped valley hard rock area, which comprises the following steps:

s1, excavating and backfilling a river valley side slope and the bottom, leveling a field at the bottom of a first-level construction platform, and reserving construction positions of a second-level construction platform and a third-level construction platform;

s2, building a first-level construction platform:

s21, constructing a frame type foundation, reserving a pile foundation drilling area according to the position of a pile foundation, embedding a Bailey beam anchoring connecting piece according to the position of a Bailey beam, and embedding a second-level steel pipe pile anchoring connecting piece and a third-level steel pipe pile anchoring connecting piece according to the positions of a second-level steel pipe pile and a third-level steel pipe pile;

s22, installing a Bailey beam, wherein the Bailey beam is formed by assembling standard segments and flower stands and then is connected with the frame type foundation through Bailey beam anchoring connecting pieces;

s23, mounting distribution beams which are uniformly arranged on the top of the Bailey beam along the transverse direction;

s24, laying a platform steel plate on the top of the distribution beam;

s3, building a secondary construction platform:

s31, constructing a secondary L-shaped strip foundation, pouring the secondary L-shaped strip foundation at the designed positions of the tops of the side slopes on the left side and the right side, and embedding a secondary bearing longitudinal beam anchoring connecting piece;

s32, constructing a second-level steel pipe pile, erecting the second-level steel pipe pile at a side face design position of a side slope on a first-level platform through a crawler crane, connecting the second-level steel pipe pile with a second-level steel pipe pile anchoring connecting piece pre-embedded in the first-level construction platform, processing a second-level transverse connecting system to connect adjacent second-level steel pipe piles into a whole, and pouring concrete with a certain height at the bottom in the second-level steel pipe pile;

s33, arranging a secondary bearing beam on the top of the secondary steel pipe pile, and fixedly connecting the secondary bearing beam and the secondary steel pipe pile;

s34, constructing a secondary bearing longitudinal beam, wherein the secondary bearing longitudinal beam is uniformly arranged between the secondary bearing beam and the secondary L-shaped strip foundation, one end of the secondary bearing longitudinal beam is connected with the secondary L-shaped strip foundation through a secondary bearing longitudinal beam anchoring connecting piece, and the other end of the secondary bearing longitudinal beam is connected with the secondary bearing beam;

s35, constructing a secondary inclined connecting system, welding steel pipes into a truss structure by the aid of the secondary inclined connecting system, and then respectively connecting the secondary inclined connecting system with a secondary steel pipe pile and a secondary bearing longitudinal beam into a whole;

s36, constructing a secondary distribution beam which is uniformly arranged on the top of the secondary bearing longitudinal beam;

s37, pouring a second-level connecting pedestal, wherein the second-level connecting pedestal is arranged at the top of a side slope of a second-level construction platform, and the elevation of the top of the second-level connecting pedestal is consistent with the elevation of the top of a second-level distribution beam;

s38, constructing a second-stage platform steel plate, and paving the second-stage platform steel plate on a second-stage distribution beam and a second-stage connecting pedestal;

s39, constructing a secondary safety guardrail, and arranging the secondary safety guardrail at the edge of the empty face of the steel plate of the secondary platform;

s4, building a three-level construction platform:

s41, constructing a three-level convex strip foundation and a three-level L-shaped strip foundation, pouring the three-level convex strip foundation and the three-level L-shaped strip foundation according to design positions, and respectively embedding a three-level oblique connecting system anchoring connecting piece and a three-level bearing longitudinal beam anchoring connecting piece;

s42, constructing a three-level steel pipe pile, erecting the three-level steel pipe pile at a design position of a back side slope on a first-level platform through a crawler crane, connecting the three-level steel pipe pile with a three-level steel pipe pile anchoring connecting piece pre-embedded in the first-level construction platform, processing a three-level transverse connecting system, connecting the three-level steel pipe pile into a whole, and pouring concrete with a certain height at the bottom in the three-level steel pipe pile;

s43, constructing a third-stage bearing beam, arranging the third-stage bearing beam on the top of the third-stage steel pipe pile, and fixedly connecting the third-stage bearing beam and the third-stage steel pipe pile;

s44, uniformly arranging the third-stage bearing longitudinal beams between the third-stage bearing beams and the third-stage L-shaped strip foundation, wherein one end of each third-stage bearing longitudinal beam is fixedly connected with the third-stage L-shaped strip foundation through a third-stage bearing longitudinal beam anchoring connecting piece, and the other end of each third-stage bearing longitudinal beam is fixedly connected with the third-stage bearing beams;

s45, constructing a three-stage oblique connecting system, wherein the three-stage oblique connecting system of the construction platform is welded by steel pipes to form a truss structure, is respectively connected with a three-stage steel pipe pile and a three-stage bearing longitudinal beam into a whole, and is simultaneously connected with a three-stage convex strip foundation into a whole through anchoring connecting pieces of the three-stage oblique connecting system;

s46, constructing a third-level distribution beam, and uniformly arranging the third-level distribution beam on the top of the third-level load-bearing longitudinal beam;

s47, constructing a third-stage platform steel plate, and paving the third-stage platform steel plate on a third-stage distribution beam;

s48, constructing a third-level safety guardrail, and arranging the third-level safety guardrail at the edge position of the empty face of the third-level platform steel plate.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the V-shaped valley hard rock area multistage bridge construction platform, the form that the frame type foundation is connected with the steel pipe piles is adopted as the supporting stand columns, the problem that the steel pipe piles in the hard rock area are difficult to insert and beat can be solved, and materials and construction period are saved.

2. According to the V-shaped valley hard rock area multistage bridge construction platform, the concrete is filled in the steel pipe piles, so that the rigidity of the steel pipe piles and the overall stability of the platform can be improved, and water flow impact can be borne favorably.

3. According to the V-shaped valley hard rock area multistage bridge construction platform, the three-stage construction platform is designed in the V-shaped valley, the topographic characteristics are fully utilized, the construction operation area is increased, and the problem that the valley area is narrow is solved.

4. According to the V-shaped valley hard rock area multistage bridge construction platform, the platform steel pipe pile connection system and the support structure are all in a prefabricated assembly mode, the installation and the disassembly are convenient, and the platform can be used repeatedly.

Drawings

Fig. 1 is a schematic plane layout view of a construction platform of a multistage bridge construction platform in a V-shaped valley hard rock area according to an embodiment of the present invention;

fig. 2 is a schematic front structural view of a multistage bridge construction platform in a V-shaped valley hard rock area according to an embodiment of the present invention;

fig. 3 is a schematic front structure diagram of relevant parts of a first-stage construction platform and a second-stage construction platform of a multi-stage bridge construction platform in a V-shaped valley hard rock area according to an embodiment of the present invention;

fig. 4 is a schematic side structure view of a secondary construction platform of a multi-level bridge construction platform in a V-shaped valley hard rock area according to an embodiment of the present invention;

fig. 5 is a schematic side structure view of a relevant part of a three-level construction platform of a multi-level bridge construction platform in a V-shaped valley hard rock area according to an embodiment of the present invention;

fig. 6 is a schematic front structure diagram of a relevant part of a secondary construction platform of a multi-level bridge construction platform in a V-shaped valley hard rock area according to an embodiment of the present invention;

fig. 7 is a schematic front structure diagram of a relevant part of a first-stage construction platform of a multi-stage bridge construction platform in a V-shaped valley hard rock area according to an embodiment of the present invention;

fig. 8 is a schematic side structure diagram of a relevant part of a first-level construction platform of a multi-level bridge construction platform in a V-shaped valley hard rock area according to an embodiment of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a first-level construction platform; 2. a secondary construction platform; 3. a third-level construction platform; 100. a frame-type foundation; 101. a bailey beam anchoring connector; 103. a Bailey beam; 104. flower stand; 105. a distribution beam; 106. a platform steel plate; 107. pile foundation position; 108. a drilling area; 201. a second-stage steel pipe pile; 202. a secondary transverse connection system; 203. a secondary oblique connection system; 204. a secondary spandrel girder; 205. a secondary load-bearing longitudinal beam; 206. a secondary load-bearing longitudinal beam anchoring connecting piece; 207. a second-level L-shaped strip foundation; 208. a secondary distribution beam; 209. a secondary platform steel plate; 210. a secondary safety barrier; 211. a secondary connecting pedestal; 301. three-stage steel pipe piles; 302. three-stage transverse connection system; 303. a three-stage oblique connection system; 304. a third-stage load-bearing beam; 305. a third stage load-bearing longitudinal beam; 306. a third-level convex strip foundation; 307. the three-stage oblique connection system is an anchoring connecting piece; 308. a three-level L-shaped strip foundation; 309. a third level load bearing longitudinal beam anchoring connecting piece; 310. a third-level distribution beam; 311. a third-stage platform steel plate; 312. a third-level safety barrier; 1021. anchoring the connecting piece by the second-level steel pipe pile; 1022. three-level steel-pipe pile anchor connecting piece.

Detailed Description

The present invention is further described in detail below with reference to specific examples so that those skilled in the art can more clearly understand the present invention.

It should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are intended to be construed broadly, as if they were connected either fixedly or removably, or as integrally formed structures. To those of ordinary skill in the art, the specific meaning of such terms in this patent may be understood as appropriate.

The V type river valley is usually the bottom and is more flat area, and the left and right sides is the side slope, and the dorsal part also is the side slope, and dorsal part side slope is probably the highest moreover, when the V type river valley is under construction, need set up construction platform on bottom of a valley and the left and right sides side slope at least, and conventional construction platform installation degree of difficulty is big, the steel-pipe pile is inserted and is beaten the difficulty, support stability is not enough, the construction site is narrow and small, can't satisfy the user demand.

In order to solve the above problems, as shown in fig. 1 to 8, the present embodiment provides a multi-level bridge construction platform in a hard rock area of a V-shaped valley, which includes a first-level construction platform 1 disposed at the bottom of the valley, and second-level construction platforms 2 disposed on the side slopes on the left and right sides of the valley;

in this embodiment, the first-level construction platform 1 is arranged at the bearing platform, is a low-level construction platform at the flat position of the bottom topography of the river valley, and can be used for walking and operating machines such as a rotary drilling rig during pile foundation construction. The second-level construction platform 2 is arranged on side slopes on the left side and the right side of a valley, is a high-level platform, is connected with a mountain road, and can be used for walking and operating construction vehicles such as a natural pump, a concrete tank truck and the like during material storage and transportation and construction.

Specifically, as shown in fig. 7-8, the first-stage construction platform 1 includes a frame-type foundation 100, a beret beam 103, a distribution beam 105, and a platform steel plate 106, the frame-type foundation 100 is fixedly disposed at the bottom of a valley, the frame-type foundation 100 is reserved with a drilling area 108 according to a pile foundation position 107, a plurality of beret beam anchoring connectors 101 are pre-embedded on the upper surface of the frame-type foundation 100, the beret beam 103 is fixedly mounted on the frame-type foundation 100 through the beret beam anchoring connectors 101, the adjacent beret beams 103 are fixedly connected through a flower shelf 104, the distribution beam 105 is fixedly mounted on the beret beam 103, and the platform steel plate 106 is fixedly laid on the distribution beam 105;

the frame-type foundation 100 may be made of reinforced concrete, the size of the frame-type foundation 100 is designed according to the position of the second-stage steel pipe pile 201 and the position of the third-stage steel pipe pile 301, and the drilling area 108 is reserved in the pile foundation position.

The beret beam anchoring connector 101 may be disposed at a longitudinal and lateral node position of the frame-type foundation 100.

The drilling areas 108 may be distributed in a matrix form, and the berey beam anchoring connectors 101 may also be distributed in a matrix form.

As shown in fig. 7 and 8, the berey beam 103 can be formed by splicing a single standard segment, and the lateral ends and the ends of the berey beam 103 are connected by the pergola 104 and longitudinally overlap at the fulcrum positions of the frame-type foundation 100 (the distribution positions of the berey beam anchoring connectors 101) to form a main load-bearing beam.

The distribution beam 105 may be a double-spliced i-beam structure, the distribution beam 105 may be perpendicular to the bailey beam 103, and the distribution beam 105 is erected on the top of the bailey beam 103.

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

Specifically, the second-level construction platform 2 comprises a second-level steel pipe pile 201, a second-level load-bearing beam 204, a second-level load-bearing longitudinal beam 205, a second-level L-shaped strip foundation 207, a second-level distribution beam 208 and a second-level platform steel plate 209, wherein a second-level steel pipe pile anchoring connector 1021 is pre-embedded in the upper surface of the frame-shaped foundation 100, the second-level steel pipe pile 201 is fixedly installed on the frame-shaped foundation 100 through the second-level steel pipe pile anchoring connector 1021, the second-level load-bearing beam 204 is fixedly installed at the top end of the second-level steel pipe pile 201, the second-level L-shaped strip foundation 207 is fixedly arranged at the tops of the side slopes on both sides, a second-level load-bearing longitudinal beam anchoring connector 206 is pre-embedded in the upper surface of the second-level L-shaped strip foundation 207, one end of the second-level load-bearing longitudinal beam 205 is fixedly overlapped on the second-level L-shaped strip foundation 207 through the second-level load-bearing longitudinal beam anchoring connector 206, the other end of the second-level load-bearing longitudinal beam 205 is fixedly overlapped on the second-level load-bearing beam 204, the second-level distribution beam 208 is fixedly installed on the second-level distribution beam 205, and the second-level platform steel plate 209 is fixedly laid on the second-level distribution beam 208.

The two-stage construction platform 2 can be respectively arranged on the side slopes on the left side and the right side of the valley.

As shown in fig. 3, the second-level steel pipe pile anchoring connectors 1021 are pre-embedded on the left and right sides of the upper surface of the frame-type foundation 100, so that the second-level construction platform 2 is conveniently built on the slopes on the left and right sides of the valley.

As shown in fig. 4, the secondary construction platform 2 may include three secondary steel pipe piles 201, three secondary steel pipe pile anchoring connectors 1021 are pre-embedded in the left and right sides of the upper surface of the frame-shaped foundation 100, and the bottoms of the secondary steel pipe piles 201 and the secondary steel pipe pile anchoring connectors 1021 are connected into a whole, so that the secondary steel pipe piles 201 and the frame-shaped foundation 100 are connected into a whole, and the stability of the platform is ensured.

Concrete is poured into the second-level steel pipe pile 201. Similar to the combined steel pipe pile structure, the rigidity of the stand column and the overall stability of the platform can be improved, so that the second-level steel pipe pile 201 can bear more and stronger water flow impact.

The second-level L-shaped strip foundation 207 may be a reinforced concrete structure and is disposed at the top of the side slope.

The secondary spandrel girder 204 may be a double-spliced i-shaped steel structure.

The secondary load-bearing longitudinal beam 205 may be a double-spliced i-steel structure.

The secondary bearing longitudinal beam 205 may be perpendicular to the secondary bearing beam 204, one end of the secondary bearing longitudinal beam 205 is connected to the secondary L-shaped strip foundation 207 through the secondary bearing longitudinal beam anchoring connector 206, and the other end of the secondary bearing longitudinal beam 205 and the secondary bearing beam 204 may be welded and fixed to form an integral structure.

The distribution beam 208 may be a double-spliced i-shaped steel structure, and is uniformly arranged on the secondary bearing longitudinal beam 205 at intervals.

The secondary platform steel plate 209 and the distribution beam 208 may be fixed by welding.

In this embodiment, the secondary construction platform 2 further includes a secondary transverse connection system 202, and the adjacent secondary steel pipe piles 201 are fixedly connected by the secondary transverse connection system 202. The secondary transverse connection system 202 is welded into a truss structure by using steel pipes. The three secondary steel pipe piles 201 can be connected into a whole through the secondary transverse connection system 202, so that the structure is more stable.

In this embodiment, as shown in fig. 6, the secondary construction platform 2 further includes a secondary oblique connection system 203, and the secondary steel pipe pile 201 is fixedly connected to the secondary load-bearing longitudinal beam 205 through the secondary oblique connection system 203. The secondary inclined connecting system 203 can be a truss structure formed by welding steel pipes, three paths are arranged along the slope direction, and each path corresponds to one secondary steel pipe pile 201. The secondary steel pipe pile 201 can be connected with the secondary bearing longitudinal beam 205 through the secondary oblique connecting system 203 to form a whole, so that the structure of the secondary bearing longitudinal beam 205 is more stable.

In this embodiment, be equipped with second grade safety barrier 210 on the second grade platform steel sheet 209, second grade platform steel sheet 209 is equipped with the connection pedestal 211 that is used for smooth-going road towards side slope one side.

The secondary safety barrier 210 may be welded to the secondary platform steel plate 209.

The connection pedestal 211 can be of a reinforced concrete structure and is arranged at the top of a side slope of a secondary construction platform, and the connection pedestal 211 can be connected with a secondary platform steel plate 209 and used for smoothing roads.

In addition, in order to further expand the construction range, a third-level construction platform can be arranged on the side slope on the back side of the river valley, is the highest-level construction platform, and can be used for storing and transporting materials, and walking and operating construction vehicles such as a natural pump and a concrete tank truck during construction.

Specifically, in this embodiment, the multistage bridge construction platform further includes a third-stage construction platform 3 disposed on a slope on the back side of the valley, the third-stage construction platform 3 includes a third-stage steel pipe pile 301, a third-stage load-bearing beam 304, a third-stage load-bearing longitudinal beam 305, a third-stage L-shaped strip foundation 308, a third-stage distribution beam 310, and a third-stage platform steel plate 311, the third-stage steel pipe pile anchoring connector 1022 is pre-embedded in the upper surface of the frame-shaped foundation 100, the third-stage steel pipe pile 301 is fixedly mounted on the frame-shaped foundation 100 through the third-stage steel pipe pile anchoring connector 1022, the third-stage load-bearing beam 304 is fixedly mounted at the top end of the third-stage steel pipe pile 301, the third-stage L-shaped strip foundation 308 is fixedly mounted at the top of the slope on the back side, the third-stage L-shaped strip foundation 308 has a third-stage steel pipe pile anchoring connector 309, one end of the third-stage load-bearing longitudinal beam 305 is fixedly mounted on the third-stage L-shaped strip foundation 308 through the third-stage steel pipe pile anchoring connector 309, the other end of the third-stage load-bearing longitudinal beam 305 is fixedly mounted on the third-stage load-bearing longitudinal beam 304, the third-stage load-bearing longitudinal beam distribution beam 310 is fixedly mounted on the third-stage load-bearing platform steel plate 311.

Wherein, tertiary construction platform 3 sets up in river valley dorsal side top of a slope position, is high-order construction platform. Seven steel-pipe piles 301 may be included. Seven steel pipe pile anchor connecting pieces 1022 are pre-embedded in the back side of the upper surface of the frame-shaped foundation 100, and the bottom of the three-level steel pipe pile 301 is connected with the three-level steel pipe pile anchor connecting pieces 1022 into a whole, so that the three-level steel pipe pile 301 and the frame-shaped foundation 100 form a whole, and the stability of the platform is ensured.

Concrete is poured into the three-level steel pipe pile 301. Similar to the combined steel pipe pile structure, the rigidity of the stand column and the overall stability of the platform can be improved, so that the three-level steel pipe pile 301 can bear more and stronger water flow impact.

The three-level L-shaped strip foundation 308 can be of a reinforced concrete structure and is arranged at the top of a side slope, and a three-level load-bearing longitudinal beam anchoring connecting piece 309 is arranged on the top surface.

The third-stage load-bearing beam 304 can be of a double-spliced I-shaped steel structure. The tertiary load-bearing longitudinal beam 305 may also be a double-spliced i-shaped steel structure.

One end of the third-stage bearing longitudinal beam 305 is connected with the third-stage L-shaped strip foundation 308 through the third-stage bearing longitudinal beam anchoring connecting piece 309, and the other end of the third-stage bearing longitudinal beam 305 and the third-stage bearing beam 304 can be fixed through welding to form a whole support.

The third-stage distribution beams 310 may be double-spliced i-shaped steel structures and are uniformly arranged on the third-stage load-bearing longitudinal beams 305 at intervals. The tertiary platform steel plate 311 may be welded and fixed to the tertiary distribution beam 310.

The third-level safety barrier 312 may be welded and fixed with the third-level platform steel plate 311.

In this embodiment, referring to fig. 2 again, the three-level construction platform 3 further includes three-level transverse connection systems 302, and the adjacent three-level steel pipe piles 301 are connected by the three-level transverse connection systems 302. Seven three-level steel pipe piles 301 are connected into a whole through the three-level transverse connecting system 302.

In this embodiment, as shown in fig. 5, the third-level construction platform 3 further includes a third-level oblique connection system 303 and a third-level convex bar-shaped foundation 306, the third-level convex bar-shaped foundation 306 is fixedly disposed at a midpoint position of the back-side slope, three-level oblique connection system anchoring connection members 307 are embedded in the upper surface and the side surface of the third-level convex bar-shaped foundation 306, and the third-level oblique connection system 303 is simultaneously and fixedly connected to the third-level steel pipe pile 301, the third-level load-bearing longitudinal beam 305, and the third-level oblique connection system anchoring connection members 307.

The three-level oblique connection systems 303 can be welded by steel pipes to form a truss structure, seven paths are arranged, and the seven paths of the three-level oblique connection systems 303 correspond to the seven three-level steel pipe piles 301 one by one.

The three-level convex strip foundation 306 may be a reinforced concrete structure, and is arranged at the midpoint of the side slope, and seven of the three-level convex strip foundations 306 are arranged in one-to-one correspondence with seven of the three-level oblique connecting system anchoring connectors 307.

On the other hand, based on the construction platform, the invention provides a construction method of a multi-level bridge in a V-shaped valley hard rock area, which comprises the following steps:

s1, excavating and backfilling a river valley side slope and the bottom, leveling a field at the bottom of a first-level construction platform, and reserving construction positions of a second-level construction platform and a third-level construction platform;

s2, building a first-level construction platform 1:

s21, constructing the frame-type foundation 100, reserving a pile foundation drilling area 108 according to the position 107 of a pile foundation, embedding a Bailey beam anchoring connector 101 according to the position of a Bailey beam 103, and embedding a second-level steel pipe pile anchoring connector 1021 and a third-level steel pipe pile anchoring connector 1022 according to the positions of a second-level steel pipe pile and a third-level steel pipe pile;

s22, installing a Bailey beam 103, wherein the Bailey beam 103 is formed by assembling standard segments and a flower stand 104 and then is connected with a frame-type foundation 100 through a Bailey beam anchoring connecting piece 101;

s23, installing distribution beams 105, wherein the distribution beams 105 are uniformly arranged on the top of the Bailey beam 103 along the transverse direction;

s24, laying a platform steel plate 106 on the top of the distribution beam 105;

s3, building a secondary construction platform 2:

s31, constructing a secondary L-shaped strip foundation 207, pouring the secondary L-shaped strip foundation 207 at the designed positions of the tops of the left and right side slopes, and embedding a secondary bearing longitudinal beam anchoring connecting piece 206 in advance;

s32, constructing a second-level steel pipe pile 201, erecting the second-level steel pipe pile 201 at a side face design position of a side slope through a crawler crane on a first-level platform, connecting the second-level steel pipe pile 201 with a second-level steel pipe pile anchoring connecting piece 1021 pre-embedded in the first-level construction platform, processing a second-level transverse connecting system 202 to connect adjacent second-level steel pipe piles 201 into a whole, and pouring concrete with a certain height at the bottom in the second-level steel pipe pile 201;

s33, arranging a secondary bearing beam 204 on the top of the secondary steel pipe pile 201, and fixedly connecting the two;

s34, constructing a secondary bearing longitudinal beam 205, wherein the secondary bearing longitudinal beam 205 is uniformly arranged between the secondary bearing beam 204 and the secondary L-shaped strip foundation 207, one end of the secondary bearing longitudinal beam 205 is connected with the secondary L-shaped strip foundation 207 through a secondary bearing longitudinal beam anchoring connecting piece 206, and the other end of the secondary bearing longitudinal beam 205 is connected with the secondary bearing beam 204;

s35, constructing a secondary oblique connecting system 203, welding the secondary oblique connecting system 203 into a truss structure by adopting steel pipes, and then respectively connecting the truss structure with a secondary steel pipe pile 201 and a secondary bearing longitudinal beam 205 into a whole;

s36, constructing a secondary distribution beam 208, wherein the secondary distribution beam 208 is uniformly arranged on the top of the secondary bearing longitudinal beam 205;

s37, pouring and constructing a secondary connecting pedestal 211, wherein the secondary connecting pedestal 211 is arranged at the top of a side slope of a secondary construction platform, and the top elevation of the secondary connecting pedestal 211 is consistent with the top elevation of the secondary distribution beam 208;

s38, constructing a secondary platform steel plate 209, and paving the secondary platform steel plate 209 on the secondary distribution beam 208 and the secondary connecting pedestal 211;

s39, constructing a secondary safety guardrail 210, and arranging the secondary safety guardrail 210 at the edge position of the empty surface of the secondary platform steel plate 209;

s4, building a third-level construction platform 3:

s41, constructing a tertiary convex strip foundation 306 and a tertiary L-shaped strip foundation 308, pouring the tertiary convex strip foundation 306 and the tertiary L-shaped strip foundation 308 according to design positions, and embedding a tertiary oblique connecting system anchoring connecting piece 307 and a tertiary load-bearing longitudinal beam anchoring connecting piece 309 respectively;

s42, constructing a three-level steel pipe pile 301, erecting the three-level steel pipe pile 301 at a back side slope design position on a first-level platform through a crawler crane, connecting the three-level steel pipe pile 301 with a three-level steel pipe pile anchoring connecting piece 1022 pre-embedded in the first-level platform, processing a three-level transverse connecting system 302, connecting the three-level steel pipe pile 301 into a whole, and pouring concrete with a certain height at the bottom in the three-level steel pipe pile 301;

s43, constructing a third-stage bearing beam 304, arranging the third-stage bearing beam 304 on the top of the third-stage steel pipe pile 301, and fixedly connecting the third-stage bearing beam 304 and the third-stage steel pipe pile 301;

s44, uniformly arranging the third-stage bearing longitudinal beams 305 between the third-stage bearing beams 304 and the third-stage L-shaped strip foundations 308, wherein one ends of the third-stage bearing longitudinal beams 305 are fixedly connected with the third-stage L-shaped strip foundations 308 through third-stage bearing longitudinal beam anchoring connecting pieces 309, and the other ends of the third-stage bearing longitudinal beams 305 are fixedly connected with the third-stage bearing beams 304;

s45, constructing a third-level oblique connecting system 303, welding the third-level oblique connecting system 303 of the construction platform into a truss structure by adopting steel pipes, respectively connecting the truss structure with a third-level steel pipe pile 301 and a third-level load-bearing longitudinal beam 305 into a whole, and simultaneously connecting the truss structure with a third-level convex strip foundation 306 into a whole through a third-level oblique connecting system anchoring connecting piece 307;

s46, constructing a third-level distribution beam 310, and uniformly arranging the third-level distribution beam on the top of the third-level load-bearing longitudinal beam 305;

s47, constructing a third-stage platform steel plate 311, and paving the third-stage platform steel plate 311 on the third-stage distribution beam 310;

and S48, constructing a third-level safety guardrail 312, and arranging the third-level safety guardrail 312 at the edge position of the empty face of the third-level platform steel plate 311.

The mechanisms, components and parts of the present invention which are not described in detail are all the existing structures which exist in the prior art. Can be purchased directly from the market.

The above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A V-shaped valley hard rock area multistage bridge construction platform is characterized by comprising a first-stage construction platform (1) arranged at the bottom of a valley and second-stage construction platforms (2) arranged on side slopes on the left side slope and the right side slope of the valley;

the primary construction platform (1) comprises a frame type foundation (100), a Bailey beam (103), a distribution beam (105) and a platform steel plate (106), wherein the frame type foundation (100) is fixedly arranged at the bottom of a valley, a drilling area (108) is reserved on the frame type foundation (100) according to a pile foundation position (107), bailey beam anchoring connecting pieces (101) are pre-embedded on the upper surface of the frame type foundation (100), the Bailey beam (103) is fixedly installed on the frame type foundation (100) through the Bailey beam anchoring connecting pieces (101), adjacent Bailey beams (103) are fixedly connected through flower stands (104), the distribution beam (105) is fixedly installed on the Bailey beam (103), and the platform steel plate (106) is fixedly laid on the distribution beam (105);

second grade construction platform (2) include second grade steel-pipe pile (201), second grade spandrel girder (204), second grade bearing longeron (205), second grade L shaped strip foundation (207), second grade distributive girder (208), second grade platform steel sheet (209), frame type foundation (100) upper surface is pre-buried to have second grade steel-pipe pile anchor connecting piece (1021), second grade steel-pipe pile (201) pass through second grade steel-pipe pile anchor connecting piece (1021) fixed mounting be in on frame type foundation (100), second grade spandrel girder (204) fixed mounting be in second grade steel-pipe pile (201) top, second grade L shaped strip foundation (207) are fixed to be set up in both sides side slope top, second grade L shaped strip foundation (207) upper surface is pre-buried to have second grade bearing longeron anchor connecting piece (206), second grade bearing longeron (205) one end is passed through second grade bearing longeron anchor connecting piece (206) fixed overlap joint be in on second grade L shaped strip foundation (207), second grade bearing longeron (205) other end fixed overlap joint be in second grade spandrel girder (204), second grade distributive girder (208) fixed mounting be in second grade bearing longeron (209) is laid on second grade bearing longeron platform steel sheet (209).

2. The V-shaped valley hard rock area multistage bridge construction platform as claimed in claim 1, wherein the second-stage construction platform (2) further comprises a second-stage transverse connection system (202), and adjacent second-stage steel pipe piles (201) are fixedly connected through the second-stage transverse connection system (202).

3. The V-shaped valley hard rock area multilevel bridge construction platform according to claim 1, characterized in that the second-level construction platform (2) further comprises a second-level oblique connection system (203), and the second-level steel pipe pile (201) is fixedly connected with the second-level load-bearing longitudinal beam (205) through the second-level oblique connection system (203).

4. The V-shaped valley hard rock area multistage bridge construction platform as claimed in claim 1, wherein a second-stage safety guardrail (210) is arranged on the second-stage platform steel plate (209), and a connecting pedestal (211) for smoothing roads is arranged on one side, facing a slope, of the second-stage platform steel plate (209).

5. The multistage bridge construction platform in the V-shaped valley hard rock area according to claim 1, further comprising a third stage construction platform (3) arranged on a slope at the back side of the valley, wherein the third stage construction platform (3) comprises a third stage steel pipe pile (301), a third stage load-bearing beam (304), a third stage load-bearing longitudinal beam (305), a third stage L-shaped strip foundation (308), a third stage distribution beam (310) and a third stage platform steel plate (311), wherein the third stage steel pipe pile anchoring connector (1022) is pre-embedded on the upper surface of the frame-shaped foundation (100), the third stage steel pipe pile (301) is fixedly arranged on the frame-shaped foundation (100) through the third stage steel pipe pile anchoring connector (1022), the third stage load-bearing beam (304) is fixedly arranged at the top end of the third stage steel pipe pile (301), the third stage L-shaped strip foundation (308) is fixedly arranged at the top of the slope at the back side, the third stage L-shaped strip foundation (308) is fixedly arranged on the upper surface of the third stage L-shaped strip foundation (308), the third stage load-bearing longitudinal beam (309) is fixedly arranged on the third stage load-bearing longitudinal beam (305), one end of the third stage L-bearing longitudinal beam (305) is fixedly arranged on the third stage load-bearing longitudinal beam (305) through the third stage load-bearing longitudinal beam (309), and the third stage load-bearing longitudinal beam (305) is fixedly arranged on the third stage load-bearing longitudinal beam (305), and the three-stage platform steel plate (311) is fixedly laid on the three-stage distribution beam (310).

6. The V-shaped valley hard rock area multistage bridge construction platform is characterized in that the three-stage construction platform (3) further comprises three-stage transverse connection systems (302), and adjacent three-stage steel pipe piles (301) are fixedly connected through the three-stage transverse connection systems (302).

7. The V-shaped valley hard rock area multilevel bridge construction platform of claim 5, wherein the third-level construction platform (3) further comprises a third-level oblique connection system (303) and a third-level convex strip foundation (306), the third-level convex strip foundation (306) is fixedly arranged at the midpoint of the back side slope, three-level oblique connection system anchoring connection members (307) are embedded in the upper surface and the side surface of the third-level convex strip foundation (306), and the third-level oblique connection system (303) is fixedly connected with the third-level steel pipe pile (301), the third-level load-bearing longitudinal beam (305) and the third-level oblique connection system anchoring connection members (307) at the same time.

8. The multistage bridge construction platform in the V-shaped valley hard rock area according to claim 5, characterized in that three-stage safety guardrails (312) are arranged on the three-stage platform steel plate (311).

9. The V-shaped valley hard rock area multistage bridge construction platform of claim 5, characterized in that concrete is poured into the second-stage steel pipe pile (201) and the third-stage steel pipe pile (301).

10. A construction method of a multistage bridge in a V-shaped valley hard rock area according to any one of claims 1 to 9, comprising the steps of:

s1, excavating and backfilling a river valley side slope and the bottom, leveling a field at the bottom of a first-level construction platform, and reserving construction positions of a second-level construction platform and a third-level construction platform;

s2, building a first-level construction platform (1):

s21, constructing a frame foundation (100), reserving a pile foundation drilling area (108) according to a pile foundation position (107), embedding a Bailey beam anchoring connector (101) according to the position of a Bailey beam (103), and embedding a second-level steel pipe pile anchoring connector (1021) and a third-level steel pipe pile anchoring connector (1022) according to the positions of a second-level steel pipe pile and a third-level steel pipe pile;

s22, installing a Bailey beam (103), wherein the Bailey beam (103) is formed by assembling standard segments and flower stands (104) and then is connected with a frame-type foundation (100) through a Bailey beam anchoring connecting piece (101);

s23, mounting distribution beams (105), wherein the distribution beams (105) are uniformly arranged at the tops of the Bailey beams (103);

s24, laying a platform steel plate (106) on the top of the distribution beam (105);

s3, building a secondary construction platform (2):

s31, constructing a secondary L-shaped strip foundation (207), pouring the secondary L-shaped strip foundation (207) at the designed positions of the tops of the side slopes on the left side and the right side, and embedding a secondary bearing longitudinal beam anchoring connecting piece (206);

s32, constructing a second-level steel pipe pile (201), erecting the second-level steel pipe pile (201) at the design positions of the side slopes on the left side and the right side on a first-level platform through a crawler crane, connecting the second-level steel pipe pile with a second-level steel pipe pile anchoring connecting piece (1021) pre-embedded in the first-level construction platform, processing a second-level transverse connecting system (202) to connect adjacent second-level steel pipe piles (201) into a whole, and pouring concrete with a certain height at the bottom in the second-level steel pipe pile (201);

s33, arranging a secondary bearing beam (204) on the top of the secondary steel pipe pile (201), and fixedly connecting the two;

s34, constructing a secondary bearing longitudinal beam (205), wherein the secondary bearing longitudinal beam (205) is uniformly arranged between the secondary bearing beam (204) and the secondary L-shaped strip foundation (207), one end of the secondary bearing longitudinal beam (205) is connected with the secondary L-shaped strip foundation (207) through a secondary bearing longitudinal beam anchoring connecting piece (206), and the other end of the secondary bearing longitudinal beam is connected with the secondary bearing beam (204);

s35, constructing a secondary inclined connecting system (203), wherein the secondary inclined connecting system (203) adopts a truss structure and is then respectively connected with a secondary steel pipe pile (201) and a secondary bearing longitudinal beam (205) into a whole;

s36, constructing a secondary distribution beam (208), wherein the secondary distribution beam (208) is uniformly arranged at the top of the secondary bearing longitudinal beam (205);

s37, pouring a second-level connecting pedestal (211), wherein the second-level connecting pedestal (211) is arranged at the top of the side slope of the second-level construction platform, and the top elevation of the second-level connecting pedestal is consistent with that of the second-level distribution beam (208);

s38, constructing a secondary platform steel plate (209), and paving the secondary platform steel plate (209) on a secondary distribution beam (208) and a secondary connecting pedestal (211);

s39, constructing a secondary safety guardrail (210), and arranging the secondary safety guardrail (210) at the edge position of the empty face of the secondary platform steel plate (209);

s4, building a three-level construction platform (3):

s41, constructing a three-level convex strip foundation (306) and a three-level L-shaped strip foundation (308), pouring the three-level convex strip foundation (306) and the three-level L-shaped strip foundation (308) according to design positions, and embedding a three-level oblique connecting system anchoring connecting piece (307) and a three-level load-bearing longitudinal beam anchoring connecting piece (309) respectively;

s42, constructing three-level steel pipe piles (301), erecting the three-level steel pipe piles (301) at the design positions of the side slopes on the back sides on a first-level platform through crawler cranes, connecting the three-level steel pipe piles with three-level steel pipe pile anchoring connecting pieces (1022) pre-embedded in the first-level construction platform, processing three-level transverse connecting systems (302), connecting the three-level steel pipe piles (301) into a whole, and pouring concrete with a certain height at the bottom in the three-level steel pipe piles (301);

s43, constructing a third-stage bearing beam (304), arranging the third-stage bearing beam (304) on the top of the third-stage steel pipe pile (301), and fixedly connecting the third-stage bearing beam and the third-stage bearing beam;

s44, uniformly arranging the three-stage bearing longitudinal beams (305) between the three-stage bearing beams (304) and the three-stage L-shaped strip foundation (308), wherein one ends of the three-stage bearing longitudinal beams (305) are fixedly connected with the three-stage L-shaped strip foundation (308) through three-stage bearing longitudinal beam anchoring connecting pieces (309), and the other ends of the three-stage bearing longitudinal beams are fixedly connected with the three-stage bearing beams (304);

s45, constructing a three-stage oblique connecting system (303), wherein the three-stage oblique connecting system (303) of the construction platform adopts a truss structure, is integrally connected with a three-stage steel pipe pile (301) and a three-stage bearing longitudinal beam (305), and is integrally connected with a three-stage convex strip foundation (306) through a three-stage oblique connecting system anchoring connecting piece (307);

s46, constructing a third-level distribution beam (310) and uniformly arranging the third-level distribution beam on the top of the third-level load-bearing longitudinal beam (305);

s47, constructing a third-level platform steel plate (311), and paving the third-level platform steel plate (311) on a third-level distribution beam (310);

s48, constructing a third-level safety guardrail (312), and arranging the third-level safety guardrail (312) at the edge position of the empty face of the third-level platform steel plate (311).

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