Hard rock shallow covering layer fabricated steel cofferdam pier construction platform and installation method thereof

Abstract

The invention provides a hard rock shallow covering layer fabricated steel cofferdam pier construction platform and a mounting method thereof.The hard rock shallow covering layer fabricated steel cofferdam pier construction platform comprises a fabricated steel cofferdam body and a plurality of construction platform units arranged around the fabricated steel cofferdam body, and a connecting platform is arranged between the tops of the construction platform units; a plurality of external supporting components surrounding the fabricated steel cofferdam body are arranged between the inner sides of the construction platform units, and a platform pull rod component connected with a covering layer riverbed is arranged between the outer sides of every two adjacent construction platform units. According to the fabricated steel cofferdam, the fabricated steel cofferdam main body can be conveniently subjected to corresponding splicing construction work through the firstly-formed construction platform, meanwhile, the fabricated steel cofferdam main body is connected with the construction platform through the external supporting component after being installed to form a complete fabricated structure whole, meanwhile, an inner support does not need to be installed, and the construction cost is reduced. And the internal construction space of the cofferdam is effectively saved.

Description

Technical Field

[0001] The present invention relates to the field of cofferdam construction, and particularly to an assembled steel cofferdam pier construction platform for hard rock shallow overburden layer and an installation method thereof. Background Art

[0002] The development of steel cofferdams can be traced back to the early 20th century. With the rapid development of water conservancy projects and urban infrastructure construction, steel cofferdams have been gradually widely used due to their good strength, construction flexibility and adaptability. The basic structure of modern steel cofferdams usually includes key parts such as steel sheet piles, steel beams, connection systems, support systems and waterproof sealing structures. These components work together to ensure the stability and functionality of the steel cofferdam in complex construction environments.

[0003] With the progress of the times and the increasing attention of society to prefabricated buildings, ecological environment protection and sustainable development, the design concept of modern steel cofferdams is also constantly updated. New steel cofferdams pay more attention to efficient assembly and environmental protection, and strive to minimize the impact on the water ecological environment while meeting the construction requirements. Modular design has become the mainstream trend, which not only improves the transportation and installation efficiency, but also can flexibly combine components of different specifications according to specific construction conditions to adapt to diverse engineering scenarios.

[0004] Meanwhile, construction platform technology is also constantly developing. Currently common technical solutions include basket-type, lifting-type, mobile platforms, etc., which can meet the requirements for working space in different construction environments and further improve construction efficiency and safety.

[0005] However, there are still some problems in the existing construction process. At present, most steel cofferdams and their supporting construction platforms are independently built and used, lacking an integrated assembled integrated design, resulting in complex construction processes and reduced efficiency. In addition, in the foundation construction areas with relatively hard geological conditions, it is difficult to drive and fix traditional steel cofferdams, which is likely to affect the stability of the overall structure. These problems not only cause waste of construction space, but also increase construction costs and management difficulties. Summary of the Invention

[0006] The main purpose of the present invention is to provide an assembled steel cofferdam pier construction platform for hard rock shallow overburden layer and an installation method thereof, so as to solve the problems that most current steel cofferdams and their supporting construction platforms are independently built and used, lacking an integrated assembled integrated design, resulting in complex construction processes and reduced efficiency. In addition, in the foundation construction areas with relatively hard geological conditions, it is difficult to drive and fix traditional steel cofferdams, which is likely to affect the stability of the overall structure.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows: a construction platform for a pier of a prefabricated steel cofferdam in a shallow overburden layer of hard rock and its installation method, which includes a prefabricated steel cofferdam main body and a plurality of construction platform units arranged around the prefabricated steel cofferdam main body. A connecting platform is provided between the tops of the construction platform units, a plurality of external support members surrounding the prefabricated steel cofferdam main body are provided between the inner sides of the construction platform units, and a platform tie rod member connected to the overburden riverbed is provided between the outer sides of two adjacent construction platform units.

[0008] In a preferred embodiment, the prefabricated steel cofferdam main body includes bottom support channel steels arranged at the bottom and a plurality of steel cofferdam units vertically arranged on the bottom support part, and a transverse water stop part is provided at the connection part between them.

[0009] In a preferred embodiment, the steel cofferdam unit is composed of a transverse straight row connection part and a longitudinal U-shaped connection part, and a longitudinal water stop part is provided at the connection part between the transverse straight row connection part and the longitudinal U-shaped connection part; Both the transverse straight row connection part and the longitudinal U-shaped connection part are composed of end channel steels symmetrically arranged up and down and steel cofferdam plates arranged between the end channel steels; A diagonal brace is provided at the corner of the end channel steel of the longitudinal U-shaped connection part.

[0010] In a preferred embodiment, the transverse water stop part includes transverse mounting plates symmetrically arranged on the channel steels on both sides of the connection seam. A transverse rubber water stop belt is provided between the outer sides of the two transverse mounting plates, and a transverse fixing pressing plate fixed to the two transverse mounting plates is provided on the outer side of the transverse rubber water stop belt; The longitudinal water stop part includes longitudinal mounting plates symmetrically arranged on the steel cofferdam plates on both sides of the connection seam. A longitudinal rubber water stop belt is provided between the outer sides of the two longitudinal mounting plates, and a longitudinal fixing pressing plate fixed to the two longitudinal mounting plates is provided on the outer side of the longitudinal rubber water stop belt.

[0011] In a preferred embodiment, the construction platform unit includes a platform support. A partition connecting beam is provided at the top of the platform support. A plurality of equally spaced partition grooves are provided on the partition connecting beam. A unit Bailey beam is installed between each pair of partition grooves opposite to each other on the two partition connecting beams, and a unit platform plate is provided on the unit Bailey beam.

[0012] In a preferred embodiment, the connecting platform includes a connecting Bailey beam arranged in the partition grooves of the partition connecting beams of two construction platform units, and a connecting platform plate is provided on the connecting Bailey beam.

[0013] In a preferred embodiment, the external support member includes an external transverse connecting rod arranged between the inner sides of the construction platform units. A plurality of support rods are provided on the inner side of the external transverse connecting rod. A connecting seat corresponding to the support rod is provided on the outside of the prefabricated steel cofferdam main body, and the support rod is threadedly connected to the corresponding connecting seat through a threaded rod provided at the end.

[0014] In a preferred embodiment, the platform tie member includes a tie base embedded in the overburden riverbed between two construction platform units, and two tie members disposed on the tie base. The other ends of the two tie members are respectively connected to the two construction platform units; The tie member includes a hinge seat disposed on the top of the construction platform unit, and a telescopic tie rod hinged to the hinge seat. The other end of the telescopic tie rod can be hinged to the tie base; The telescopic tie rod includes an outer sleeve rod. The top of the outer sleeve rod is provided with a top hinge portion that can be hinged to the hinge seat, and a telescopic cavity with an open bottom end is arranged inside. Symmetrically arranged on the telescopic cavity are limiting grooves that penetrate it. An inner telescopic rod is movably inserted into the telescopic cavity. The top end of the telescopic rod is provided with a limiting locking portion that penetrates the two limiting grooves, and the bottom end is provided with a bottom hinge seat that can be hinged to the tie base; The limiting locking portion includes a limiting rod that penetrates the two limiting grooves. The limiting rod is hollow, and a left - and - right - hand screw is rotatably arranged inside it. One end of the limiting rod is provided with a first driving device that is in transmission connection with the left - and - right - hand screw. Threaded sleeves are respectively sleeved on the two threaded segments of the left - and - right - hand screw. A plurality of sliding grooves corresponding to the threaded segments of the left - and - right - hand screw are arranged outside the limiting rod. A connecting block that passes through the sliding groove is arranged outside the moving shaft, and the other end of the connecting block is connected to a locking seat. The side of the locking seat close to the outer sleeve rod has a shape matching it, and a locking rubber sheet is arranged thereon; The tie member further includes an angle - adjusting telescopic cylinder. One end of the angle - adjusting telescopic cylinder is hinged to the construction platform unit, and the other end is hinged to the outer sleeve rod.

[0015] In a preferred embodiment, the telescopic tie rod further includes a telescopic adjustment structure. The telescopic adjustment structure includes a support platform arranged on the outer sleeve rod. The support platform is located below the limiting groove. Two non - rotating screw jacks are arranged on the support platform. The top of the screw of the non - rotating screw jack is provided with a collar sleeved on the outside of the limiting rod. The support platform is provided with an opening for the screw of the non - rotating screw jack to pass through. The two non - rotating screw jacks are in transmission connection through a transmission shaft. A second driving device is installed in transmission on one of the non - rotating screw jacks; The bottom of the support platform is provided with a support leg connected to the outer sleeve rod; The installation method of the tie rod member is as follows: Before assembling the construction platform unit, install the telescopic tie rod in the telescopic state and the angle-adjusting telescopic cylinder on it, and use a strap to tie the bottom end of the telescopic tie rod to the construction platform unit. Then, assemble the construction platform unit according to the installation positions of the tie rod member and the tie rod base. After the construction platform unit is assembled, remove the strap, and then use the angle-adjusting telescopic cylinder to adjust the telescopic tie rod to the corresponding angle with the tie rod base. Then, adjust the telescopic tie rod to the corresponding length, and after completing the hinge connection with the tie rod base, lock its length.

[0016] The method includes: S1. Assemble multiple construction platform units around the installation position of the assembled steel cofferdam main body on the hard rock riverbed; S2. Install platform tie rod members with the bottom buried in the hard rock riverbed between two adjacent construction platform units; S3. Install a connecting platform between the tops of the construction platform units to form a construction platform; S3. Excavate 1 m below the riverbed and install the assembled steel cofferdam main body therein; S4. Use a pump to pump out the accumulated water inside the assembled steel cofferdam main body and pour concrete inside it to form a construction base surface; S5. Install multiple external support members arranged vertically and in contact with the assembled steel cofferdam main body between the construction platform units.

[0017] The present invention provides a construction platform for a pier of an assembled steel cofferdam in a shallow overburden layer of hard rock and its installation method. Through the pre-formed construction platform, it is convenient to carry out corresponding assembly construction work on the assembled steel cofferdam main body. At the same time, after the assembled steel cofferdam main body is installed, it is connected to the construction platform through external support members to form a complete assembled structural whole. At the same time, there is no need to install internal supports, effectively saving the construction space inside the cofferdam. In addition, by adopting the method of strengthening with platform tie rod members, the overall stability is further improved, ensuring the safety and reliability during the construction process, preventing the structural instability caused by the excessive span of the construction platform. Through the longitudinal water stop part and the transverse water stop part, the problem of water seepage inside the cofferdam is significantly improved, and the waterproof performance is improved. Aiming at the construction problem that it is difficult to drill and drive piles for the riverbed with hard rock layers, this construction platform has the advantages of simple processing, fast installation, low cost and environmental friendliness. Compared with the existing independently built construction platform, this structure realizes the combination of the steel cofferdam and the construction platform, forming an interactive overall assembled system, making the structural layout more reasonable and the construction more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following further describes the present invention with reference to the drawings and embodiments: Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is a schematic diagram of a partial structure of the present invention; Figure 3 is a structural diagram of a construction platform unit of the present invention; Figure 4 is a connection structure diagram of a partition connection beam, a unit Bailey beam and a unit platform plate of the present invention; Figure 5 is a connection structure diagram of a construction platform unit, a connection platform and a platform tie rod member of the present invention; Figure 6 is an exploded view of a connection structure of a transverse straight row connection part and a longitudinal U-shaped connection part of the present invention; Figure 7 is a structural diagram of a transverse water stop part of the present invention; Figure 8 is a structural diagram of a longitudinal water stop part of the present invention; Figure 9 is a partial structural diagram of an external support member of the present invention; Figure 10 is a structural diagram of a first embodiment of a tie rod member of the present invention; Figure 11 is an exploded structural diagram of a telescopic tie rod of the present invention; Figure 12 is a half-sectional view structural diagram of a limit locking part of the present invention; Figure 13 is a connection structure diagram of a moving shaft, a connection block and a locking seat of the present invention; Figure 14 is a structural diagram of an angle-adjusting telescopic cylinder in an adjusting state of the present invention; Figure 15 is a structural diagram of a second embodiment of a telescopic tie rod of the present invention; Figure 16 is the present invention Figure 15 partial structural diagram in; Figure 17 is the present invention Figure 16 structural diagram from another perspective; In the figure: Construction platform unit 1; Platform support 101; Partition connecting beam 102; Unit Bailey beam 103; Unit platform board 104; Assembled steel cofferdam main body 2; Bottom support channel steel 20; Steel cofferdam unit 21; Transverse straight row connecting part 210; Longitudinal U-shaped connecting part 211; Longitudinal water stop part 212; Longitudinal mounting plate 2120; Longitudinal rubber water stop belt 2121; Longitudinal fixing pressure plate 2122; Diagonal brace 213; Transverse water stop part 22; Transverse mounting plate 220; Transverse rubber water stop belt 221; Transverse fixing pressure plate 222; External support member 3; External transverse connecting rod 301; Support rod 302; Threaded rod 303; Connecting seat 304; Platform tie rod member 4; Tie rod base 41; Tie rod 42; Hinge seat 43; Telescopic tie rod 44; Outer sleeve rod 440; Top hinge part 441; Telescopic cavity 442; Limit groove 443; Telescopic rod 444; Limit locking part 445; Limit rod 4450; Positive and negative thread lead screw 4451; First driving device 4452; Moving shaft 4453; Sliding groove 4454; Connecting block 4455; Locking seat 4456; Bottom hinge seat 446; Telescopic adjustment structure 447; Support platform 4470; Non-rotating screw jack 4471; Transmission shaft 4472; Second driving device 4473; Collar 4474; Opening 4475; Support leg 4476; Angle adjustment telescopic cylinder 45; Connecting platform 5; Connecting Bailey beam 501; Connecting platform board 502. Detailed implementation mode

[0019] Embodiment 1 As Figure 1-17 shown, a construction platform for a pier of an assembled steel cofferdam in a shallow overburden layer of hard rock includes an assembled steel cofferdam main body 2 and a plurality of construction platform units 1 arranged around the assembled steel cofferdam main body 2. In this embodiment, the number of construction platform units 1 is four, and they are respectively arranged at the four corners of the assembled steel cofferdam main body 2. A connecting platform 5 is arranged between the tops of the construction platform units 1. The connecting platform 5 connects the tops of all construction platform units 1 to form a construction platform surrounding the assembled steel cofferdam main body 2. A plurality of external support members 3 surrounding the assembled steel cofferdam main body 2 are arranged between the inner sides of the construction platform units 1. In this embodiment, the number of external support members 3 is two, and they are respectively located at the top and middle of the assembled steel cofferdam main body 2, so as to form a stable external support structure for the assembled steel cofferdam main body 2 and save the construction space inside the cofferdam. A platform tie rod member 4 connected to the overburden riverbed is arranged between the outer sides of two adjacent construction platform units 1, effectively avoiding the situation of unstable structure caused by the large span between the construction platform units 1.

[0020] With such a design, the construction platform unit 1 and the connecting platform 5 provided thereon can be utilized to form a construction platform outside the assembled steel cofferdam main body 2, facilitating the installation work of the assembled steel cofferdam main body 2. At the same time, the external support members 3 can further connect the construction platform structure, enhancing its structural strength. Meanwhile, the assembled steel cofferdam main body 2 and the construction platform form an assembled integral structure that interacts with each other, improving the stability between them, providing a stable external support structure for the assembled steel cofferdam main body 2, saving the construction space inside the cofferdam, and avoiding arranging internal support structures inside it. In addition, by setting platform tie rod members 4 connected to the overburden riverbed between two adjacent construction platform units 1, the stability of the relatively large span between them can be effectively solved, further improving the stability of the construction platform.

[0021] In the preferred solution, the assembled steel cofferdam main body 2 includes bottom support channel steels 20 arranged at the bottom and a plurality of steel cofferdam units 21 vertically arranged on the bottom support part 20, and a transverse water stop part 22 is arranged at the connection between them.

[0022] The steel cofferdam unit 21 is composed of a transverse straight row connection part 210 and a longitudinal U-shaped connection part 211. In this embodiment, the steel cofferdam unit 21 is a frame structure composed of two longitudinal U-shaped connection parts 211 and two transverse straight row connection parts 210, and a longitudinal water stop part 212 is arranged at the connection between the transverse straight row connection part 210 and the longitudinal U-shaped connection part 211.

[0023] Both the transverse straight row connection part 210 and the longitudinal U-shaped connection part 211 are composed of end channel steels symmetrically arranged up and down and steel cofferdam plates arranged between the end channel steels. The steel cofferdam plates are connected to each other and to the end channel steels by seamless welding. Moreover, holes are provided at the ends of the end channel steels to facilitate the bolt connection of the transverse straight row connection part 210 and the longitudinal U-shaped connection part 211. Holes are also provided on the end channel steels to facilitate the bolt connection between the upper and lower steel cofferdam units 21 and between the steel cofferdam units 21 and the bottom support channel steels 20, and corresponding holes are reserved on the bottom support channel steels 20.

[0024] A diagonal brace 213 is arranged at the corner of the end channel steel of the longitudinal U-shaped connection part 211 to improve the structural strength at its corner, and the diagonal brace 213 is fixed by welding.

[0025] The horizontal water stop part 22 includes horizontal mounting plates 220 symmetrically arranged on the channel steels on both the upper and lower sides of the connection joint. The design of the channel steel can prevent the horizontal mounting plates 220 from being directly installed on the uneven steel cofferdam plate, thus preventing the formation of an effective water stop structure. A horizontal rubber water stop belt 221 is arranged between the outer sides of the two horizontal mounting plates 220. A horizontal fixing pressing plate 222 fixed to the two horizontal mounting plates 220 is arranged on the outer side of the horizontal rubber water stop belt 221, so as to tightly clamp the horizontal rubber water stop belt 221 between the horizontal mounting plates 220 and the horizontal fixing pressing plate 222, forming an effective water stop structure.

[0026] The longitudinal water stop part 212 includes longitudinal mounting plates 2120 symmetrically arranged on the steel cofferdam plates on both the left and right sides of the connection joint. It should be noted that the connection joint here is a joint where a steel cofferdam plate is split in the middle, so as to facilitate the installation of the two longitudinal mounting plates 2120 on the same plane. A longitudinal rubber water stop belt 2121 is arranged between the outer sides of the two longitudinal mounting plates 2120. A longitudinal fixing pressing plate 2122 fixed to the two longitudinal mounting plates 2120 is arranged on the outer side of the longitudinal rubber water stop belt 2121, and its principle is the same as that of the horizontal water stop part 22.

[0027] With such a design, the water stop problem during the docking of the assembled steel cofferdam main body 2 can be effectively solved through the horizontal water stop part 22 and the longitudinal water stop part 212.

[0028] In this embodiment, both the horizontal rubber water stop belt 221 and the longitudinal rubber water stop belt 2121 are commercially available products, so no detailed description is given here.

[0029] In the preferred solution, the construction platform unit 1 includes a platform support 101. In this embodiment, the platform support 101 is a steel support structure, specifically including four steel columns. A horizontal bracing and a diagonal bracing are installed between the four steel columns by bolts. A partition connecting beam 102 is arranged at the top of the platform support 101. A plurality of equally spaced partition grooves are arranged on the partition connecting beam 102. A unit Bailey beam 103 is installed between each pair of opposite partition grooves of the two partition connecting beams 102. A unit platform plate 104 is arranged on the unit Bailey beam 103.

[0030] In the preferred solution, the connection platform 5 includes a connection Bailey beam 501 arranged between the partition grooves of the partition connecting beams 102 of the two construction platform units 1. A connection platform plate 502 is arranged on the connection Bailey beam 501, and its installation structure is the same as that of the unit Bailey beam 103 and the unit platform plate 104.

[0031] In the preferred solution, the external support member 3 includes an external transverse connecting rod 301 disposed between the inner sides of the construction platform units 1. The transverse connecting rod 301 is fixed between the platform brackets 101 of the construction platform unit 1 by bolts. A plurality of support rods 302 are provided on the inner side of the external transverse connecting rod 301. A connecting seat 304 corresponding to the support rod 302 is provided on the outside of the prefabricated steel cofferdam body 2. The support rod 302 is threadedly connected to the corresponding connecting seat 304 through a threaded rod 303 provided at the end. The connecting seat 304 is specifically arranged on the outside of the channel steel at the end of the steel cofferdam unit 21 by welding.

[0032] During installation, the support rod 302 is threadedly installed on the corresponding connecting seat 304 through the threaded rod 303 at its end, and is rotated to fit with the transverse connecting rod 301, and then fixed to the transverse connecting rod 301 by bolts and welding, so as to form a connection structure between the prefabricated steel cofferdam body 2 and the four construction platform units 1.

[0033] In the preferred solution, the platform tie rod member 4 includes a tie rod base 41 buried in the covered riverbed between two construction platform units 1, and two tie rod members 42 provided on the tie rod base 41. The other ends of the two tie rod members 42 are respectively connected to the two construction platform units 1, thereby forming a V-shaped tie rod structure between the two construction platform units 1, effectively improving the stability between them.

[0034] In order to facilitate the installation of the tie rod member 4, further, the tie rod member 4 includes a hinge seat 43 provided on the top of the construction platform unit 1. The hinge seat 43 is fixed by bolts, and a telescopic tie rod 44 hinged to the hinge seat 43. The other end of the telescopic tie rod 44 can be hinged to the tie rod base 41. Through the telescopic tie rod 44, it can be adjusted in time according to the length required during installation, and can adapt to the complex construction environment.

[0035] Among them, the telescopic tie rod 44 specifically includes an outer sleeve rod 440. A top hinge portion 441 that can be hinged to the hinge seat 43 is provided at the top of the outer sleeve rod 440, and a telescopic cavity 442 with an open bottom end is provided inside. The top hinge portion 441 is hinged to the hinge seat 43 through a shaft. Symmetrically arranged on the telescopic cavity 442 are limiting grooves 443 that penetrate it. The length of the limiting grooves 443 can be adjusted according to the required telescopic length. An inner telescopic rod 444 is movably inserted into the telescopic cavity 442. A limiting locking portion 445 that penetrates the two limiting grooves 443 is provided at the top end of the telescopic rod 444, and a bottom hinge seat 446 that can be hinged to the tie rod base 41 is provided at the bottom end. It should be noted that two seat bodies that can be hinged to the bottom hinge seat 446 through a shaft are symmetrically arranged on the tie rod base 41.

[0036] The limit locking part 445 includes a limit rod 4450 passing through two limit slots 443, so that by sliding the limit rod 4450 in the two limit slots 443, the effect of restricting the linear sliding and sliding distance of the telescopic rod 444 is achieved.

[0037] In addition, the limit rod 4450 is hollow, and a left - hand and right - hand lead screw 4451 is rotatably arranged inside it. The left - hand and right - hand lead screw 4451 is rotatably arranged in the limit rod 4450 through a bearing. One end of the limit rod 4450 is provided with a first driving device 4452 drivingly connected to the left - hand and right - hand lead screw 4451. The first driving device 4452 is fixed to the end of the limit rod 4450 by bolts, and its output shaft is drivingly connected to the left - hand and right - hand lead screw 4451. Moving shafts 4453 are respectively thread - sleeved on the two thread segments of the left - hand and right - hand lead screw 4451. A plurality of sliding slots 4454 corresponding to the thread segments of the left - hand and right - hand lead screw 4451 are arranged outside the limit rod 4450. In this embodiment, each thread segment corresponds to three annularly distributed sliding slots 4454, and the length of the sliding slot 4454 is adapted to the length of the thread segment. A connecting block 4455 passing through the sliding slot 4454 is arranged outside the moving shaft 4453, and the other end of the connecting block 4455 is connected to a locking seat 4456. The side of the locking seat 4456 close to the outer sleeve rod 440 has a shape matching it, and a locking rubber sheet is arranged thereon.

[0038] With such a design, the first driving device 4452 can be used to drive the left - hand and right - hand lead screw 4451 to rotate, thereby driving the two moving shafts 4453 thereon to move towards each other under the sliding fit of the connecting block 4455 and the sliding slot 4454, so as to realize the effect of locking the position of the telescopic rod 444 through the fitting relationship between the locking seat 4456 and the outer sleeve rod 440. Conversely, the effect of unlocking can be achieved by moving the locking seat 4456 away. At the same time, the shape of the locking seat 4456 matching the outer sleeve rod 440 and the design of the locking rubber sheet are convenient for improving the locking effect, thus realizing the effect of automatic locking and unlocking.

[0039] The pull rod member 42 further includes an angle - adjusting telescopic cylinder 45. One end of the angle - adjusting telescopic cylinder 45 is hinged to the construction platform unit 1, and the other end is hinged to the outer sleeve rod 440.

[0040] With such a design, before assembling the platform bracket 101, the pull rod member 42 can be installed on the corresponding steel column on the ground, and after the platform bracket 101 is assembled, the pull rod member 42 can be installed to the specified height without secondary hoisting work. At the same time, by using the angle - adjusting telescopic cylinder 45 to adjust its angle and adjusting the length of the telescopic pull rod 44, the connection work with the pull rod base 41 can be completed, greatly improving its installation efficiency and convenience.

[0041] In this embodiment, in order to better control the telescopic length of the telescopic rod 44, a second embodiment of the telescopic rod 44 is proposed on the basis of the above embodiment. The telescopic rod 44 also includes a telescopic adjustment structure 447. The telescopic adjustment structure 447 includes a support platform 4470 arranged on the outer rod 440, and the support platform 4470 is fixed by welding. The support platform 4470 is located below the limiting groove 443. Two non-rotating screw lifts 4471 are arranged on the support platform 4470. The top of the screw of the non-rotating screw lift 4471 is provided with a ring 4474 mounted on the outside of the limiting rod 4450. The support platform 4470 is provided with an opening 4475 for the screw of the non-rotating screw lift 4471 to pass through. The two non-rotating screw lifts 4471 are connected by a transmission shaft 4472, and a second drive device 4473 is installed on one of the non-rotating screw lifts 4471.

[0042] With such a design, when the limit locking portion 445 is unlocked, the effect of controlling the extension and retraction of the telescopic rod 444 can be achieved through the synchronous lifting of the screws of the two non-rotating screw lifts 4471, so that the use length of the telescopic rod 444 can be accurately and stably adjusted. At the same time, the self-locking function of the non-rotating screw lift 4471 when not working is combined with the locking function of the limit locking portion 445 to further enhance its locking effect. In addition, the two non-rotating screw lifts 4471 are connected by transmission through the transmission shaft 4472, and the driving effect is achieved by using a second driving device 4473, which can effectively achieve the synchronous lifting of the two non-rotating screw lifts 4471.

[0043] It should be noted that the non-rotating screw lift 4471 in this embodiment is a common commercially available product, so it will not be described in detail here. In addition, the first drive device 4452 and the second drive device 4473 are both drive motor structures.

[0044] The bottom of the support platform 4470 is provided with support legs 4476 connected to the outer sleeve rod 440 . In this embodiment, there are three support legs 4476 for improving the support strength of the support platform 4470 .

[0045] The installation method of the tie rod member 42 is as follows: before assembling the construction platform unit 1, install the retractable tie rod 44 and the angle-adjustable telescopic cylinder 45 in the telescopic state thereon, and use a strap to tie the bottom end of the retractable tie rod 44 to the construction platform unit 1, and then assemble the construction platform unit 1 according to the installation position of the tie rod member 42 and the tie rod base 41. After the construction platform unit 1 is assembled, release the strap, and then use the angle-adjustable telescopic cylinder 45 to adjust the retractable tie rod 44 to the angle corresponding to the tie rod base 41, and then adjust the retractable tie rod 44 to the corresponding length, and after completing the hinge connection with the tie rod base 41, lock its length.

[0046] Example 2 Further described in combination with Example 1. As Figure 1-17 shown in the structure, according to the installation method of the assembled steel cofferdam pier construction platform for hard rock shallow overburden layer described in Example 1, the method includes: S1. Assemble a plurality of construction platform units 1 around the installation position of the assembled steel cofferdam main body 2 on the hard rock riverbed. The specific method of the construction platform unit 1 is as follows: Place four steel columns on the hard rock riverbed according to the actual situation. If the riverbed position is higher than the standard elevation, it can be ground to the standard elevation by grinding. If the riverbed position is lower than the standard elevation, it can be leveled to the standard elevation by grouting. Then, install the horizontal bracing and diagonal bracing between the four steel columns through bolts to form the platform support 101. Then, install the unit Bailey beams 103 into the partition grooves of the partition connecting beams 102 in sequence on land, and install the unit platform plates 104 on the unit Bailey beams 103 and fix them to the partition connecting beams 102 through bolts. Then, lift this part onto the platform support 101 and fix it with bolts.

[0047] S2. Install the platform tie rod members 4 with the bottom buried in the hard rock riverbed between two adjacent construction platform units 1. When installing the platform tie rod members 4, first fix the tie rod base 41 to the hard rock riverbed by embedding, and the installation method of the tie rod member 42 is as described in Example 1.

[0048] S3. Install the connecting platform 5 between the tops of the construction platform units 1 to form the construction platform. When installing the connecting platform 5, hoist the connecting Bailey beams 501 into the partition grooves between the corresponding partition connecting beams 102 in sequence, and then hoist the unit platform plates 104 onto the connecting Bailey beams 501 and fix them.

[0049] S3. Excavate 1 m below the riverbed and install the assembled steel cofferdam main body 2 therein. The specific installation method of the assembled steel cofferdam main body 2 is as follows: Prefabricate the horizontally straight row connecting parts 210 and the longitudinally U-shaped connecting parts 211 that can be spliced with each other in the factory, transport them to the construction site, form the steel cofferdam units 21, install the longitudinal water stop parts 212 at the joints, then excavate 1 m below the riverbed and install the bottom support channel steel 20 therein. Then, place the first section of the steel cofferdam unit 21 on the previously installed bottom support channel steel 20 and fix the two by bolt connection, and install the transverse water stop part 22 at the joint. Then, repeat the installation steps of the steel cofferdam unit 21 until the installation of the assembled steel cofferdam main body 2 is completed.

[0050] S4. Use a water pump to pump out the accumulated water inside the assembled steel cofferdam main body 2 and pour concrete inside it to form the construction base surface.

[0051] S5. Install a plurality of external support members 3 arranged vertically between the construction platform units 1 and in contact with the main body 2 of the prefabricated steel cofferdam. The installation method of the external support members 3 is as described in the first embodiment.

[0052] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. The assembled steel cofferdam pier construction platform for hard rock with shallow overburden layer is characterized in that: It includes a fabricated steel cofferdam main body (2) and a plurality of construction platform units (1) arranged around the fabricated steel cofferdam main body (2). A connecting platform (5) is provided between the tops of the construction platform units (1). A plurality of external support members (3) surrounding the fabricated steel cofferdam main body (2) are provided between the inner sides of the construction platform units (1). A platform tie rod member (4) connected to the overburden riverbed is provided between the outer sides of two adjacent construction platform units (1).

2. The prefabricated steel cofferdam pier construction platform for hard rock shallow overburden layer according to claim 1, characterized in that: The fabricated steel cofferdam main body (2) includes bottom support channel steels (20) arranged at the bottom and a plurality of steel cofferdam units (21) vertically arranged on the bottom support part (20), and a transverse water stop part (22) is provided at the connection between them.

3. The prefabricated steel cofferdam pier construction platform for hard rock in shallow overburden layer according to claim 2, characterized in that: steel The cofferdam unit (21) is composed of a transverse straight row connecting part (210) and a longitudinal U-shaped connecting part (211). A longitudinal water stop part (212) is provided at the connection between the transverse straight row connecting part (210) and the longitudinal U-shaped connecting part (211); Both the transverse straight row connecting part (210) and the longitudinal U-shaped connecting part (211) are composed of end channel steels symmetrically arranged up and down and steel cofferdam plates arranged between the end channel steels; A diagonal brace (213) is provided at the corner of the end channel steel of the longitudinal U-shaped connecting part (211).

4. The prefabricated steel cofferdam pier construction platform for hard rock shallow overburden layer according to claim 3, wherein: The transverse water stop part (22) includes transverse mounting plates (220) symmetrically arranged on the channel steels on both sides of the connection seam up and down. A transverse rubber water stop belt (221) is provided between the outer sides of the two transverse mounting plates (220). A transverse fixing pressing plate (222) fixed to the two transverse mounting plates (220) is provided on the outer side of the transverse rubber water stop belt (221); The longitudinal water stop part (212) includes longitudinal mounting plates (2120) symmetrically arranged on the steel cofferdam plates on both sides of the connection seam left and right. A longitudinal rubber water stop belt (2121) is provided between the outer sides of the two longitudinal mounting plates (2120). A longitudinal fixing pressing plate (2122) fixed to the two longitudinal mounting plates (2120) is provided on the outer side of the longitudinal rubber water stop belt (2121).

5. The prefabricated steel cofferdam pier construction platform for hard rock shallow overburden layer according to claim 1, wherein: The construction platform unit (1) includes a platform support (101). A partition connecting beam (102) is provided at the top of the platform support (101). A plurality of equally spaced partition grooves are provided on the partition connecting beam (102). A unit Bailey beam (103) is installed between each pair of opposite partition grooves of the two partition connecting beams (102). A unit platform plate (104) is provided on the unit Bailey beam (103).

6. The prefabricated steel cofferdam pier construction platform for hard rock shallow overburden layer according to claim 5, characterized in that: The connecting platform (5) includes a connecting Bailey beam (501) arranged in the partition grooves of the partition connecting beams (102) of the two construction platform units (1). A connecting platform plate (502) is provided on the connecting Bailey beam (501).

7. The prefabricated steel cofferdam pier construction platform for hard rock shallow overburden layer according to claim 1, characterized in that: The external support member (3) comprises an external transverse connecting rod (301) arranged between the inner sides of the construction platform unit (1), a plurality of supporting rods (302) are arranged on the inner side of the external transverse connecting rod (301), and a connecting seat (304) corresponding to the supporting rod (302) is arranged on the outside of the assembled steel cofferdam body (2), and the supporting rod (302) is threadedly connected to the corresponding connecting seat (304) via a threaded rod (303) arranged at the end.

8. The prefabricated steel cofferdam pier construction platform for hard rock shallow overburden layer according to any one of claims 1-7, characterized in that: The platform tie rod component (4) comprises a tie rod base (41) buried in the riverbed of the covering layer between the two construction platform units (1), and two tie rod members (42) arranged on the tie rod base (41), the other ends of the two tie rod members (42) being respectively connected to the two construction platform units (1); The pull rod member (42) comprises a hinged seat (43) arranged on the top of the construction platform unit (1), and a retractable pull rod (44) hinged to the hinged seat (43), and the other end of the retractable pull rod (44) can be hinged to the pull rod base (41); The telescopic pull rod (44) comprises an outer rod (440), the top of the outer rod (440) is provided with a top hinged portion (441) which can be hinged to the hinged seat (43), the interior is provided with a telescopic cavity (442) with an open bottom, the telescopic cavity (442) is symmetrically provided with limit grooves (443) passing through it, a telescopic rod (444) is movably inserted in the telescopic cavity (442), the top of the telescopic rod (444) is provided with a limit locking portion (445) passing through the two limit grooves (443), and the bottom end is provided with a bottom hinged seat (446) which can be hinged to the pull rod base (41); The limit locking portion (445) comprises a limit rod (4450) penetrating two limit grooves (443); the limit rod (4450) is hollow and has a forward and reverse threaded screw (4451) rotatably arranged therein; one end of the limit rod (4450) is provided with a first driving device (4452) drivingly connected to the forward and reverse threaded screw (4451); two threaded sections of the forward and reverse threaded screw (4451) are respectively threadedly sleeved with a moving shaft (4453); The limiting rod (4450) is provided with a plurality of sliding grooves (4454) corresponding to the threaded sections of the forward and reverse threaded screws (4451) on the outside, and the movable shaft (4453) is provided with a connecting block (4455) passing through the sliding grooves (4454) on the outside, and the other end of the connecting block (4455) is connected to a locking seat (4456), and the locking seat (4456) has a side close to the outer sleeve rod (440) in a shape matching the outer sleeve rod (440) and a locking rubber sheet is provided thereon; The pull rod member (42) further comprises an angle-adjusting telescopic cylinder (45), one end of which is hingedly arranged on the construction platform unit (1), and the other end of which is hingedly arranged on the outer sleeve rod (440).

9. The construction platform of the assembled steel cofferdam pier for hard rock shallow overburden layer according to claim 8, characterized in that: The telescopic pull rod (44) further comprises a telescopic adjustment structure (447), the telescopic adjustment structure (447) comprising a support platform (4470) arranged on the outer rod (440), the support platform (4470) being located below the limiting groove (443), two non-rotating lead screw elevators (4471) being arranged on the support platform (4470), a collar (4474) being sleeved on the outside of the limiting rod (4450) being arranged at the top of the lead screw of the non-rotating lead screw elevator (4471), an opening (4475) through which the lead screw of the non-rotating lead screw elevator (4471) passes being arranged on the support platform (4470), the two non-rotating lead screw elevators (4471) being connected in transmission via a transmission shaft (4472), and a second driving device (4473) being installed in transmission on one of the non-rotating lead screw elevators (4471); The bottom of the support platform (4470) is provided with a support foot (4476) connected to the outer sleeve rod (440); The installation method of the tie rod member (42) is as follows: before assembling the construction platform unit (1), a telescopic tie rod (44) and an angle-adjustable telescopic cylinder (45) are installed thereon, and the bottom end of the telescopic tie rod (44) is tied to the construction platform unit (1) using a strap, and then the construction platform unit (1) is assembled according to the installation position of the tie rod member (42) and the tie rod base (41). After the construction platform unit (1) is assembled, the strap is released, and then the telescopic tie rod (44) is adjusted to an angle corresponding to the tie rod base (41) using the angle-adjustable telescopic cylinder (45), and then the telescopic tie rod (44) is adjusted to a corresponding length, and after the hinge connection with the tie rod base (41) is completed, its length is locked.

10. The installation method of the prefabricated steel cofferdam pier construction platform for hard rock shallow overburden layer according to any one of claims 1-9, characterized in that: The method includes: S1, assembling a plurality of construction platform units (1) around the installation position of the assembled steel cofferdam body (2) on a hard rock riverbed; S2, installing a platform tie rod component (4) with its bottom buried in a hard rock riverbed between two adjacent construction platform units (1); S3, installing a connecting platform (5) between the tops of the construction platform units (1) to form a construction platform; S3, dig 1m below the riverbed and install the assembled steel cofferdam body (2) therein; S4, using a pump to pump out the accumulated water inside the assembled steel cofferdam body (2), and pouring concrete inside to form a construction foundation surface; S5. Installing a plurality of external support members (3) arranged vertically between the construction platform units (1) and in contact with the assembled steel cofferdam body (2).

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