CN220284607U

CN220284607U - Steel platform lowering structure suitable for mountain canyons

Info

Publication number: CN220284607U
Application number: CN202321484653.2U
Authority: CN
Inventors: 崔移洋; 胡军; 周功建; 褚文涛; 姚发海; 范超; 涂满明; 卢鹏; 管容; 姜勇
Original assignee: China Railway Major Bridge Engineering Group Co Ltd MBEC
Current assignee: China Railway Major Bridge Engineering Group Co Ltd MBEC
Priority date: 2023-06-12
Filing date: 2023-06-12
Publication date: 2024-01-02
Anticipated expiration: 2033-06-12

Abstract

The application relates to a steel platform structure of transferring suitable for mountain area canyon belongs to bridge engineering technical field, and this steel platform structure of transferring suitable for mountain area canyon includes support piece, and it is used for supporting steel platform, support piece's quantity is a plurality of and along steel platform's horizontal and longitudinal distribution. Therefore, the steel platform can be lifted by the jack to remove the load from the support piece without the jack, then the steel platform is lowered by the jack to transfer the load to the support piece without the jack, and then the support piece with the jack is subjected to the sectional disassembly of the cushion block or the section column, so that the support is alternately and circularly supported and lowered, the stage integral lowering of the platform can be realized, the lowering construction of the steel platform is not limited by mountain gorges and valleys and terrains, a large crane is not required to be used for lowering, the space utilization rate is improved, the construction difficulty and the construction cost are reduced, the construction period is shortened, and the steel platform is safe and reliable and easy to popularize and use.

Description

Steel platform lowering structure suitable for mountain canyons

Technical Field

The application relates to the technical field of bridge engineering, in particular to a steel platform lowering structure suitable for mountain canyons.

Background

With the development of the economy in China, more and more bridges are built in the mountain canyon area. Because of the complex and steep topography of the mountain area, the bridge construction has a plurality of difficulties, and construction surfaces with different heights are required. In order to reduce the excavation and filling of mountain bodies, working surfaces with different heights are generally provided by building lifting steel platforms.

In the related art, the traditional steel platform is generally lowered from top to bottom in a layer-by-layer manner by erecting a supporting tower and adopting a large crane hoisting mode, and for a bridge positioned at a high steep slope of a deep canyon, due to site and terrain limitation, a suitable large crane cannot enter a site and a construction site does not have a large crane station, so that the conventional method cannot be adopted for lowering. The traditional steel platform lowering method has the advantages of huge equipment, more input materials, low repeated utilization rate and high construction cost; the construction method needs large hoisting field, has serious damage to the vegetation in the mountain area and has bad ecological environment influence; and certain potential safety hazards can exist.

Therefore, in order to adapt to the development and the requirement of mountain bridge construction, improve the recycling rate of temporary structural materials, reduce the construction difficulty and the construction cost and shorten the construction period, a steel platform lowering structure suitable for mountain canyons is necessary to be provided, and convenience is created for mountain bridge construction.

Disclosure of Invention

The embodiment of the application provides a steel platform structure of transferring suitable for mountain area canyon to solve among the correlation technique steel platform transfer construction and receive mountain area canyon place and topography restriction and can't transfer and steel platform transfer construction required equipment huge, input material is more, reuse rate is low, problem that construction cost is high.

The embodiment of the application provides a steel platform structure of transferring suitable for mountain area canyon, include:

the support piece is used for supporting the steel platform, the number of the support pieces is multiple, the support pieces are distributed along the transverse direction and the longitudinal direction of the steel platform, the support piece comprises a plurality of segment columns which are mutually detachably spliced along the vertical direction, and the top ends of the segment columns are provided with a plurality of cushion blocks which are mutually detachably spliced along the vertical direction;

the lifting jacks are used for lifting the steel platform, the lifting jacks are distributed in the transverse direction and the longitudinal direction of the steel platform, and the lifting jacks are respectively located on the supporting pieces at odd or even positions in the transverse direction and the longitudinal direction.

In some embodiments, the steel platform comprises a plurality of longitudinally distributed distribution beams and a plurality of transversely distributed bailey beams erected on the distribution beams, wherein a panel is paved on the bailey beams.

In some embodiments, the jack is installed upside down, a steel plate is fixed at the bottom of the distribution beam, and the steel plate is connected with the top end of the jack through bolts.

In some embodiments, the bottom end of the jack is connected with a top cap through a bolt, and the top cap is connected with the cushion block through a bolt.

In some embodiments, a removable bolster is disposed between the segmented column and the spacer, the bolster including a plurality of connection blocks disposed side-by-side.

In some embodiments, the support further comprises a column detachably connected to the bottom end of the segment column, and a connection system is provided between two adjacent columns.

In some embodiments, the connection system is provided with a plurality of cushion blocks which are detachably spliced with each other along the vertical direction, a parallel connection is arranged between any cushion block and the upright post, and the top of the support column is connected with the jack for jacking the steel platform through a top cap.

In some embodiments, the bridge further comprises a bridge abutment at an end of the steel platform, the bridge abutment and the steel platform being connected by the support;

the bridge abutment is provided with a plurality of supporting pieces which are distributed along the length direction of the bridge abutment, and the supporting pieces at odd or even positions on the bridge abutment are provided with jacks for jacking the steel platform.

In some embodiments, the support member is provided with a washer for adjusting the support height of the support member.

In some embodiments, the lifting device further comprises a displacement sensor for monitoring lifting displacement of the jack;

the hydraulic lifting jack further comprises a PLC touch screen electrically connected with the displacement sensor and a hydraulic pump station electrically connected with the PLC touch screen, and the hydraulic pump station is connected with each jack through a hydraulic oil pipe.

The beneficial effects that technical scheme that this application provided brought include:

the embodiment of the application provides a steel platform lowering structure suitable for mountain canyons, because the number of supporting pieces for supporting the steel platform is multiple and the supporting pieces are distributed transversely and longitudinally along the steel platform, the supporting pieces comprise a plurality of segment columns which are mutually detachably spliced along the vertical direction, and a plurality of cushion blocks which are mutually detachably spliced along the vertical direction are arranged at the top ends of the segment columns; the number of the jacks for jacking the steel platform is multiple, the jacks are distributed along the transverse direction and the longitudinal direction of the steel platform, and the jacks are respectively positioned on the support pieces at odd or even positions which are distributed along the transverse direction and the longitudinal direction.

Therefore, the steel platform can be lifted by the jack to remove the load from the support piece without the jack, then the steel platform is lowered by the jack to transfer the load to the support piece without the jack, and then the support piece with the jack is subjected to the sectional disassembly of the cushion block or the section column, so that the support is alternately and circularly supported and lowered, the stage integral lowering of the platform can be realized, meanwhile, the lowering height is adjusted by the cushion block, the stable and highly controllable lowering process is ensured, the steel platform lowering construction is not limited by mountain gorges and valleys and terrains, the large crane is not required to be used for lowering, the space utilization rate is improved, the construction difficulty and the construction cost are reduced, the construction period is shortened, and the steel platform is safe and reliable and easy to popularize and use.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a top plan view of a first embodiment of the present application;

FIG. 2 is a front view of a structure of an embodiment of the present application;

FIG. 3 is a left side view of the structure of an embodiment of the present application;

FIG. 4 is a top view of a second embodiment of the present application;

fig. 5 is a left side view of a structure of a second embodiment of the present application.

In the drawings, the list of components represented by the various numbers is as follows:

1. a distribution beam; 2. bailey beam; 3. a panel;

4. a support; 41. a segmented column; 42. a cushion block; 43. a bolster; 44. a column; 45. a connection system; 46. parallel connection;

5. a jack; 6. a top cap; 7. a bridge abutment; 8. and a gasket.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

The embodiment of the application provides a steel platform structure of transferring suitable for mountain area canyon, and it can solve among the correlation technique steel platform transfer construction and receive mountain area canyon place and topography restriction and can't transfer and steel platform transfer construction required equipment huge, and input material is more, and reuse rate is low, problem that construction cost is high.

Referring to fig. 1 to 3, an embodiment of the present application provides a steel platform lowering structure suitable for mountain canyons, including:

the support pieces 4 are used for supporting the steel platform, the number of the support pieces 4 is multiple, the support pieces 4 are distributed along the transverse direction and the longitudinal direction of the steel platform, the support pieces 4 comprise a plurality of segment columns 41 which are mutually detachably spliced along the vertical direction, and the top ends of the segment columns 41 are provided with a plurality of cushion blocks 42 which are mutually detachably spliced along the vertical direction;

the jack 5 is used for lifting the steel platform, the number of the jack 5 is a plurality of the jacks and is distributed along the transverse direction and the longitudinal direction of the steel platform, and the jacks 5 are respectively positioned on the support pieces 4 at odd or even positions which are distributed along the transverse direction and the longitudinal direction.

The number of the supporting pieces 4 of the steel platform lowering structure suitable for mountain canyons is multiple, the supporting pieces 4 are distributed along the transverse direction and the longitudinal direction of the steel platform, each supporting piece 4 comprises a plurality of segment columns 41 which are mutually detachably spliced along the vertical direction, and a plurality of cushion blocks 42 which are mutually detachably spliced along the vertical direction are arranged at the top ends of the segment columns 41; the number of the jacks 5 for lifting the steel platform is plural and distributed along the transverse direction and the longitudinal direction of the steel platform, and the plurality of the jacks 5 are respectively positioned on the supporting pieces 4 at odd or even positions distributed along the transverse direction and the longitudinal direction.

It should be noted that, the plurality of jacks 5 can be uniformly controlled through the hydraulic pump station to realize the multi-point synchronous lowering construction, specifically, the jacks 5 can adopt 200t hydraulic jacks 5 with self-locking function, the maximum stroke of the jacks 5 is 14cm, and the PLC multi-point synchronous hydraulic system is adopted to realize the synchronous lowering of the jacks 5.

When the constructed steel platform needs to be lowered, the hydraulic pump station controls the jacks 5 to lift the steel platform, so that the steel platform is separated from the supporting piece 4 without the jacks 5, the load of the steel platform is transferred to the jacks 5, and then the cushion block 42 on the steel platform is detached;

then controlling the plurality of jacks 5 to enable the steel platform to be lowered onto the supporting piece 4 without the jacks 5, transferring the load of the steel platform onto the supporting piece 4 without the jacks 5, and then disassembling the cushion block 42 on the supporting piece 4 with the jacks 5;

and repeating the process, and lowering the steel platform to the designed elevation in a grading and circulating mode, so that the construction requirement is met.

It should be noted that, demolish a cushion 42 each time to can be with the height control of lowering each time at the cushion 42, simultaneously cushion 42 can use repeatedly, after dismantling a segmental post 41, install cushion 42 again, guarantee to lower a cushion 42 height each time, thereby avoid lowering the high too high steel platform that leads to and lowering unstably once, specifically, cushion 42 can adopt the cushion 42 of 10cm and 20cm height, and two cushion 42 of 10cm height can replace a cushion 42 of 20cm height, pass through bolted connection between two cushion 42, convenient dismantlement installation.

Compared with the prior art, the application has the following advantages:

in some alternative embodiments: referring to fig. 1 to 3, the embodiment of the present application provides a steel platform lowering structure suitable for mountain canyons, which includes a plurality of distribution beams 1 distributed longitudinally and a plurality of bailey beams 2 distributed transversely and erected on the distribution beams 1, and a panel 3 is laid on the plurality of bailey beams 2;

the jack 5 is installed in an inverted mode, a steel plate is fixed at the bottom of the distribution beam 1, and the steel plate is connected with the top end of the jack 5 through bolts.

The jack 5 of this application embodiment adopts the installation of inversion, for guaranteeing jack 5 convenient dismantlement, through welding the steel sheet on the bottom surface of distributing beam 1, offers the mounting hole on the steel sheet, is inverting the jack 5 through the bolt and fixing on the steel sheet, guarantees that the load can pass through jack 5 stable transmission.

In some alternative embodiments: referring to fig. 1 to 3, the embodiment of the present application provides a steel platform lowering structure suitable for mountain canyons, and the bottom end of a jack 5 of the steel platform lowering structure suitable for mountain canyons is connected with a top cap 6 through bolts, and the top cap 6 and a cushion block 42 are connected through bolts.

The jack 5 of this application embodiment is connected to the cushion 42 through the hood 6, and the hood 6 is close to the one end and the cushion 42 coincidence of cushion 42, guarantees that the load of steel platform can be through jack 5 and the stable transmission of hood 6 to cushion 42 on, and simultaneously when the load transfer of steel platform is to not setting up on the support piece 4 of jack 5, conveniently dismantle the cushion 42 of jack 5 below.

In some alternative embodiments: referring to fig. 1 to 3, the embodiment of the present application provides a steel platform lowering structure suitable for mountain canyons, wherein a detachable bolster 43 is provided between a segment column 41 and a pad 42 of the steel platform lowering structure suitable for mountain canyons, and the bolster 43 includes a plurality of connection blocks arranged side by side.

The bolster 43 of this embodiment includes a plurality of connecting blocks that set up side by side, and the connecting block passes through bolted connection festival section post 41 and cushion 42, and the connecting block can adopt the I-steel, and height is the same with cushion 42 height simultaneously, conveniently removes the back control steel platform and transfers the range, and the transverse cross section of bolster 43 is greater than the transverse cross section of cushion 42 simultaneously, guarantees that the load of cushion 42 is steadily transmitted to the festival section piece on, and when dismantling simultaneously, can move away the connecting block, easy to assemble construction, under the requirement of construction space.

In some alternative embodiments: referring to fig. 4 to 5, the embodiment of the present application provides a steel platform lowering structure suitable for mountain canyons, and the support 4 of the steel platform lowering structure suitable for mountain canyons further includes a stand 44 detachably connected to the bottom end of the segment column 41, and a connection system 45 is provided between two adjacent stands 44.

The connection system 45 of the embodiment of the application comprises a cross brace connecting two adjacent upright posts 44 and a plurality of diagonal braces connected between the two cross braces, and the connection system 45 can be arranged between the two upright posts 44 according to requirements during construction, so that the stability of the support of the upright posts 44 is ensured.

In some alternative embodiments: referring to fig. 4 to 5, the embodiment of the present application provides a steel platform lowering structure suitable for mountain canyons, a plurality of spacers 42 detachably spliced with each other along a vertical direction are provided on a connection system 45 of the steel platform lowering structure suitable for mountain canyons, a parallel connection 46 is provided between any one of the spacers 42 and a column 44, and the top of the support column is connected with a jack 5 for lifting the steel platform through a top cap 6.

Be provided with a plurality of cushion 42 and jack 5 on the connection system 45 of this application embodiment, parallel 46 is used for stabilizing cushion 42, specifically, after section post 41 and cushion 42 on stand 44 are disassembled, because jack 5 occupies stand 44 top space for the steel platform can not descend to stand 44 on, consequently, support 4 through not setting up jack 5 supports the steel platform, then can shift connection system 45 top with jack 5, through setting up a plurality of cushion 42 and being connected with jack 5 on connection system 45, then the cooperation does not set up the support 4 of jack 5 and carries out alternate circulation again and descends.

Namely, as shown in fig. 5, the steel platform is lifted up by the jack 5, the load of the steel platform is transferred to the connection system 45, the segment columns 41 are replaced by the plurality of cushion blocks 42, then the jack 5 is controlled to enable the steel platform to descend, the load of the steel platform is transferred to the upright columns 44 where the cushion blocks 42 are located, then one cushion block 42 below the jack 5 is dismounted, then the steel platform is lifted up by the jack 5, the load of the steel platform is transferred to the connection system 45, then one cushion block 42 above the upright columns 44 is dismounted, the load transfer process is repeated, and the cushion blocks 42 are dismounted successively until the steel platform is lowered onto the upright columns 44.

In some alternative embodiments: referring to fig. 1 to 5, the embodiment of the present application provides a steel platform lowering structure suitable for mountain canyons, which further includes an abutment 7 at an end of the steel platform, the abutment 7 and the steel platform being connected by a support 4;

the bridge abutment 7 is provided with a plurality of supporting pieces 4 distributed along the length direction of the bridge abutment 7, and the supporting pieces 4 at odd or even positions on the bridge abutment 7 are provided with jacks 5 for jacking up the steel platform.

Bridge abutment 7 of this application embodiment is located and waits to establish bridge both ends, is the building that is used for supporting bridge superstructure and links up with the embankment mutually, and the in-process abutment 7 that descends at the steel platform can play the effect of supporting equally with stand 44, consequently can set up support piece 4 on abutment 7, is used as temporary support, also can set up the jack 5 of jacking steel platform on the partial support piece 4 on abutment 7 simultaneously, cooperates the steel platform to descend.

When the method is implemented, the height difference between the top lifting points of any two jacks 5 and between any two temporary supporting points is strictly controlled to be not more than 10mm; tightly forbidding any jack 5 to lift the top point and the temporary supporting point to be emptied; when the asynchronous height difference of the supporting points exceeds a specified limit value, the lowering operation should be stopped immediately, and the lowering operation can be continued after the related problems are checked and solved. In the lowering process, the counter force of the jack 5 should be monitored in real time, when the counter force of the jack 5 is smaller than 80% of the calculated counter force or larger than 120% of the calculated counter force, the lowering operation should be stopped immediately, and after the relevant problems are examined and solved, the lowering operation can be continued.

In some alternative embodiments: referring to fig. 2 to 3, the embodiment of the present application provides a steel platform lowering structure suitable for mountain canyons, in which a washer 8 for adjusting the supporting height of the supporting member 4 is provided on the supporting member 4.

The gasket 8 of this application embodiment can install in order to change the supporting height of support piece 4 in the top of cushion 42, and when the concrete implementation, when there is the supporting point department that support piece 4 formed to take off the sky, can guarantee through the mode of installation cushion 42 that the load of steel platform can be transmitted to support piece 4, guarantee that a plurality of support pieces 4 can fully support and disperse the load in the steel platform process of putting down to improve the construction security.

It should be noted that, the washer 8 may be disposed on the cushion block 42 where the jack 5 is not disposed, to make up for the problem that the heights of the plurality of fulcrums are not synchronous, and meanwhile, the washer 8 may also be disposed on the cushion block 42 where the jack 5 is disposed, so as to ensure that the jack 5 can be abutted on the cushion block 42 through the top cap 6 when being mounted, and simplify the debugging process of the jack 5.

In some alternative embodiments: referring to fig. 1 to 5, the embodiment of the present application provides a steel platform lowering structure suitable for mountain canyons, which further includes a displacement sensor (not shown) for monitoring the lifting displacement of the jack 5;

the hydraulic lifting jack further comprises a PLC touch screen (not shown in the figure) electrically connected with the displacement sensor and a hydraulic pump station (not shown in the figure) electrically connected with the PLC touch screen, and the hydraulic pump station and each jack 5 are connected with each other through a hydraulic oil pipe.

Through hydraulic oil pipe interconnect between hydraulic power unit and each jack 5, the cooperation PLC touch-sensitive screen control hydraulic power unit again, and then can realize the synchronous construction of transferring of a plurality of jacks 5, displacement sensor is used for monitoring lift displacement, cooperation PLC touch-sensitive screen to realize the accurate control to steel platform height.

1. The existing column head and jack 5 are utilized for alternate and cyclic support and descending, so that the method is universally applicable to descending of steel platforms in complex mountain canyon environments limited by terrains, and has wider popularization value.

2. By utilizing hydraulic variable-frequency speed regulation control, pressure and displacement closed-loop automatic control, multipoint force balance control is realized, and the lifting or falling structure is weighed, synchronously lifted and synchronously fallen, so that the accurate lowering of the steel platform is ensured, and the safety coefficient of the system is greatly increased.

3. The whole lowering process does not need large lifting equipment, the cushion block 42 can be designed in a standardized way, and can be recycled, so that the construction cost can be effectively saved, and the economic benefit is high.

4. The jack 5 is arranged on the upright post 44, so that the construction occupied area is reduced, the large-critical structural engineering quantity is reduced, the construction period is shortened, the original mountain environment is protected, and the damage to the natural environment is reduced.

5. The steel platform is simple in lowering process, and the construction of each flow is convenient; the pad beam 43 and the cushion block 42 are of a fully assembled structure, and the dead weight of a single component is light, so that the installation and the disassembly are convenient; the construction equipment requirement is reduced, the work efficiency is improved, and the construction period is shortened.

6. And in the steel platform lowering process, the stress of each structure is clear, the potential risk brought by the lowering operation is reduced, and the lowering is safer and more reliable.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steel platform lowering structure suitable for mountain canyons, comprising:

the support piece (4) is used for supporting the steel platform, the number of the support pieces (4) is multiple, the support pieces are distributed along the transverse direction and the longitudinal direction of the steel platform, the support piece (4) comprises a plurality of segment columns (41) which are mutually detachably spliced along the vertical direction, and a plurality of cushion blocks (42) which are mutually detachably spliced along the vertical direction are arranged at the top ends of the segment columns (41);

the lifting jacks (5) are used for lifting the steel platform, the lifting jacks (5) are distributed in the transverse direction and the longitudinal direction of the steel platform, and the lifting jacks (5) are respectively arranged on the supporting pieces (4) at odd or even positions in the transverse direction and the longitudinal direction.

2. A steel platform lowering structure for mountain canyons as defined in claim 1, wherein:

the steel platform comprises a plurality of distribution beams (1) which are longitudinally distributed and a plurality of bailey beams (2) which are transversely distributed and are erected on the distribution beams (1), and a plurality of panels (3) are paved on the bailey beams (2).

3. A steel platform lowering structure for mountain canyons as claimed in claim 2, wherein:

the jack (5) is installed in an inverted mode, a steel plate is fixed at the bottom of the distribution beam (1), and the steel plate is connected with the top end of the jack (5) through bolts.

4. A steel platform lowering structure for mountain canyons as claimed in claim 3, wherein:

the bottom of the jack (5) is connected with a top cap (6) through a bolt, and the top cap (6) is connected with the cushion block (42) through a bolt.

5. A steel platform lowering structure for mountain canyons as defined in claim 1, wherein:

a detachable bolster (43) is arranged between the segment column (41) and the cushion block (42), and the bolster (43) comprises a plurality of connecting blocks which are arranged in parallel.

6. A steel platform lowering structure for mountain canyons as defined in claim 1, wherein:

the support piece (4) further comprises upright posts (44) detachably connected with the bottom ends of the section posts (41), and a connecting system (45) is arranged between two adjacent upright posts (44).

7. A steel platform lowering structure for mountain canyons as defined in claim 6, wherein:

the connection system (45) is provided with a plurality of cushion blocks (42) which are detachably spliced with each other along the vertical direction, a flat connection (46) is arranged between any cushion block (42) and the upright post (44), and the top of the support column is connected with the jack (5) for jacking the steel platform through the top cap (6).

8. A steel platform lowering structure for mountain canyons as defined in claim 1, wherein:

the bridge abutment (7) is positioned at the end part of the steel platform, and the bridge abutment (7) is connected with the steel platform through the supporting piece (4);

the bridge abutment (7) is provided with a plurality of supporting pieces (4) which are distributed along the length direction of the bridge abutment (7), and the supporting pieces (4) at odd or even positions on the bridge abutment (7) are provided with jacks (5) for jacking the steel platform.

9. A steel platform lowering structure for mountain canyons as defined in claim 1, wherein:

the support piece (4) is provided with a gasket (8) for adjusting the support height of the support piece (4).

10. A steel platform lowering structure for mountain canyons as defined in claim 1, wherein:

the lifting device also comprises a displacement sensor for monitoring lifting displacement of the jack (5);

the hydraulic lifting jack further comprises a PLC touch screen electrically connected with the displacement sensor and a hydraulic pump station electrically connected with the PLC touch screen, and the hydraulic pump station is connected with each jack (5) through a hydraulic oil pipe.