A prefabricated drilling platform and process for bare rock pile foundation in reservoir area

Abstract

The present invention discloses an assembled drilling platform and process for bare rock pile group foundation in a reservoir area, including: four positioning steel casings, which are distributed at the four corners of the drilling platform installation area, one end of any positioning steel casing is fixed under the riverbed, and the other end vertically extends upward from the water surface; four connecting mechanisms, which correspond to the four positioning steel casings one by one, and any connecting mechanism includes a steel hoop, which is sleeved on the end of the positioning steel casing extending out of the water surface and is detachably connected thereto; a plurality of corbels, which are fixed on the outer side wall of the steel hoop at intervals along the circumference of the steel hoop; an integral main beam, which is sleeved on the outside of the four positioning steel casings and supported on the corbels; and a construction platform, which is arranged on the top of the integral main beam. The present invention can conveniently realize the movement of the drilling platform on the positioning steel casing in the vertical direction by arranging matching steel hoop, corbel and other connecting mechanisms on the positioning steel casing, so that the drilling platform can flexibly adapt to the large changes in the water level in the reservoir area.

Description

Technical Field

[0001] The present invention relates to the technical field of reservoir area bridge construction, and more specifically, to an assembled drilling platform and process for a bare rock pile foundation in a reservoir area. Background Art

[0002] Before deep-water construction of pile group foundations for bridge structure piers, it is usually necessary to provide a temporary drilling platform for pile foundation construction, place construction machinery on the platform, and let the platform bear the construction load. For bare rock geological conditions, the traditional process is to lower steel pipe piles or steel casings. While the drilling rig is working, the steel pipe piles or steel casings are followed up to form holes. Such construction technology increases the construction cost of pile foundations for traditional drilling platforms. At the same time, steel pipe piles or steel casings are usually assembled by on-site welding, which has high construction risks and is difficult to ensure the construction quality. Especially in the construction of bridges in reservoir areas, the water level in the reservoir area varies greatly with the seasons, and the height of the drilling platform needs to be adjusted according to the real-time water level of the reservoir area. However, since the traditional drilling platform is fixed by welding, there are problems such as construction difficulties, high safety risks, high construction costs, and poor platform stability caused by frequent construction when connecting the height, which cannot adapt well to the characteristics of water level changes in the reservoir area.

[0003] In order to solve the above problems, it is necessary to provide a new type of reservoir bare rock pile foundation drilling platform and technology, so that the platform elevation can be adjusted with the change of reservoir water level while ensuring the stability of the platform. Summary of the invention

[0004] The purpose of the present invention is to provide an assembled drilling platform and process for bare rock pile foundation in a reservoir area. By arranging matching steel clamps, corbels and other connecting mechanisms on the positioning steel casing, the drilling platform can be easily moved in the vertical direction on the positioning steel casing, so that the drilling platform can flexibly adapt to the large changes in the water level in the reservoir area, while ensuring the overall rigidity and strength of the drilling platform.

[0005] In order to achieve these purposes and other advantages according to the present invention, a reservoir area bare rock pile foundation assembled drilling platform is provided, comprising:

[0006] Four positioning steel casings are distributed at the four corners of the predetermined installation area of ​​the drilling platform, one end of each positioning steel casing is fixed under the riverbed, and the other end extends vertically upward out of the water surface;

[0007] Four connecting mechanisms, which correspond to the four positioning steel casings one by one, each connecting mechanism comprising a steel hoop, which is sleeved on one end of the corresponding positioning steel casing extending out of the water surface and is detachably connected thereto; a plurality of brackets, which are fixed on the outer side wall of the steel hoop at intervals along the circumference thereof;

[0008] An integral main beam, which is a planar frame structure sleeved on the outside of the four positioning steel casings, and the integral main beam is supported on and fixedly connected to the plurality of corbels;

[0009] A construction platform is arranged on the top of the integral main beam and does not contact the four positioning steel casings.

[0010] Preferably, in the reservoir area bare rock pile foundation assembled drilling platform, the connecting mechanism also includes: a node plate, which is arranged below the multiple corbels and connects the bottoms of the multiple corbels and the outer side walls of the steel hoop; annular ribs, which are arranged along the circumference of the steel hoop and sequentially connect the multiple corbels and the hoop ears of the steel hoop, and the annular ribs, the multiple corbels and the hoop ears of the steel hoop together form an annular closed structure.

[0011] Preferably, in the reservoir area bare rock pile foundation assembled drilling platform, the connecting mechanism also includes a rubber sheet, which is an annular structure sleeved on the positioning steel casing and fixed on the inner side of the steel hoop.

[0012] Preferably, the assembled drilling platform for bare rock pile foundation in the reservoir area, the construction platform comprises a plurality of transverse distribution beams, which are fixed at parallel intervals on the top of the integral main beam; a plurality of longitudinal distribution beams, which are fixed at parallel intervals on the top of the plurality of transverse distribution beams, any longitudinal distribution beam is perpendicular to any transverse distribution beam; a panel, which is laid on the top of the plurality of longitudinal distribution beams, the panel is provided with a plurality of through holes, which correspond one by one to a plurality of steel casings to be constructed.

[0013] Preferably, the reservoir area bare rock pile foundation assembled drilling platform, the construction platform further comprises a railing fixed at the top edge of the panel along the circumference of the panel.

[0014] Preferably, the reservoir area bare rock pile foundation assembled drilling platform further includes a plurality of reinforcing plates, which are fixed at intervals on the outer side wall of the integral main beam.

[0015] The present invention also provides a reservoir area bare rock pile foundation assembly drilling process, comprising:

[0016] Step 1: Setting up a floating platform near the planned installation area of ​​the drilling platform;

[0017] Step 2: placing a punching device on the floating platform, and using the punching device to punch out four positioning pits in sequence underwater according to the positions of the four positioning steel casings;

[0018] Step 3: installing the four positioning steel casings in the four positioning pits in sequence, and pouring underwater concrete between the bottom of any positioning steel casing and the corresponding positioning pit;

[0019] Step 4: Under low water level conditions in the reservoir area, install the four connecting mechanisms to the same height of the four positioning steel casings, and lock the steel clamps;

[0020] Step 5: prefabricate and connect the integral main beam to the construction platform, lift it as a whole and then lower it so that it is supported on the multiple brackets of the four positioning steel casings, and fix the integral main beam to the multiple brackets;

[0021] Step 6: construct multiple steel casings on the construction platform according to the set positions of multiple steel casings to be constructed, and perform drilling construction;

[0022] Step 7. When the water level in the reservoir changes, loosen the steel clamp, lift the integral main beam, construction platform and connecting mechanism as a whole, adjust the position of the connecting mechanism on the positioning steel casing according to the water level change and lock the steel clamp, repeat step 6 until the drilling construction is completed.

[0023] Preferably, in the prefabricated drilling process for bare rock pile foundation in the reservoir area, in step one, the step of erecting a floating platform is: firstly, a plurality of floating bodies are connected as a whole according to design requirements using steel connecting beams to form a floating platform, and then a towing rope is used to connect the four corners of the floating platform to a nearby fixed structure.

[0024] Preferably, in the assembled drilling process for bare rock pile foundation in the reservoir area, in step seven, when the water level in the reservoir area rises to exceed the top of the positioning steel casing, the four positioning steel casings are first connected and then the steel clamp is loosened and the position of the connecting mechanism on the positioning steel casing is adjusted.

[0025] The present invention has at least the following beneficial effects:

[0026] 1. The present invention designs a positioning steel casing and an integral main beam that can be inserted in cooperation, and sets a detachable connection mechanism on the positioning steel casing as a support for the construction platform. The integral main beam and the construction platform are hoisted integrally by a lifting device to complete the position conversion of the drilling platform caused by a large change in water level, thereby achieving the purpose of effectively adapting to the large change in water level during construction in the reservoir area;

[0027] 2. The present invention effectively reduces the stress concentration phenomenon at the connection between the corbel and the positioning steel casing by arranging a node plate and annular ribs between the steel hoop and the corbel, so that the corbel has good stress performance;

[0028] 3. The connection mechanism, the integral main beam and the construction platform of the present invention are completely prefabricated and assembled, which greatly shortens the construction period. In addition, since the integral main beam has good integrity, by welding it to the bracket, the positioning steel casing can form a stable whole, so that the drilling platform has better overall strength, rigidity and stability.

[0029] 4. The present invention adopts a positioning steel casing placed in a positioning pit and wrapped with underwater concrete as a supporting structure, which greatly shortens the construction period and saves materials compared with the traditional steel pipe pile platform.

[0030] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the plan structure of an assembled drilling platform for bare rock pile foundation in a reservoir area according to one embodiment of the present invention;

[0032] Figure 2 It is an AA elevation cross-sectional view of the assembled drilling platform for bare rock pile foundation in the reservoir area described in the above embodiment;

[0033] Figure 3 It is a BB elevational cross-sectional view of the assembled drilling platform with bare rock pile foundation in the reservoir area described in the above embodiment;

[0034] Figure 4 It is a structural schematic diagram of the integral main beam described in the above embodiment;

[0035] Figure 5 is a schematic elevational structural diagram of the connection mechanism described in the above embodiment;

[0036] Figure 6 is a schematic diagram of the planar structure of the connecting mechanism described in the above embodiment;

[0037] Figure 7 It is a schematic diagram of the structure of the steel hoop described in the above embodiment;

[0038] Figure 8 It is a schematic diagram of the arrangement of the multiple steel casings described in the above embodiment.

[0039] Description of reference numerals:

[0040] 1. Towing rope; 2. Floating body; 3. Steel connecting beam; 4. Panel; 5. Longitudinal distribution beam; 6. Transverse distribution beam; 7. Integral main beam; 8. Corbel; 9. Node plate; 10. Positioning steel casing; 11. Railing; 12. Riverbed; 13. Underwater concrete; 14. Lifting lug; 15. Horizontal stiffening plate; 16. Strengthening plate; 17. Circumferential rib; 18. Steel clamp; 19. Rubber sheet; 20. Hoop ear; 21. High-strength bolt; 22. Steel casing. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0042] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] like Figure 1-8 As shown, the present invention provides a reservoir area bare rock pile foundation assembled drilling platform, comprising:

[0044] Four positioning steel casings 10 are distributed at the four corners of the predetermined installation area of ​​the drilling platform, one end of each positioning steel casing 10 is fixed under the riverbed 12, and the other end extends vertically upward out of the water surface;

[0045] Four connecting mechanisms, which correspond to the four positioning steel casings 10 one by one, each connecting mechanism comprises a steel hoop 18, which is sleeved on one end of the corresponding positioning steel casing 10 extending out of the water surface and is detachably connected thereto; a plurality of brackets 8, which are fixed on the outer side wall of the steel hoop 18 at intervals along the circumference thereof;

[0046] An integral main beam 7, which is a planar frame structure sleeved on the outside of the four positioning steel casings 10, and the integral main beam 7 is supported on the multiple brackets 8 and fixedly connected thereto;

[0047] The construction platform is arranged on the top of the integral main beam 7 and does not contact the four positioning steel casings 10 .

[0048] In the above technical solution, the position distribution of the positioning steel casing 10 is set according to the size and shape of the drilling platform. Four positioning steel casings 10 can roughly determine the range and boundary of the drilling platform. Any positioning steel casing 10 is set perpendicular to the riverbed 12. The position of the connecting mechanism on the steel casing 22 is set according to the real-time water level of the reservoir area. The connecting mechanism is higher than the water surface and serves as a height reference point. The height of the construction platform set above it must meet the needs of convenient drilling construction. The corbel 8 adopts a steel corbel 8, and four positioning steel casings 10 are connected as a whole by welding an integral main beam 7 on the steel corbel 8. The construction platform is stably supported above the multiple corbels 8 through the integral main beam 7. After the installation, the connecting mechanism, the integral main beam 7 and the construction platform become an integral structure, and the fixed connection point between the connecting mechanism and the positioning steel casing 10 is the steel hoop 18. The positioning steel casing 10 passes through the connecting mechanism, the integral main beam 7 and the construction platform from bottom to top in sequence. After loosening the steel hoop 18, the connecting mechanism, the integral main beam 7 and the construction platform can be hoisted and moved as a whole in the vertical direction (the height direction of the positioning steel casing) to adapt to the changes in the water level in the reservoir area (water level rise / water level drop).

[0049] In addition to the four positioning steel casings 10, a plurality of steel casings 22 to be constructed are preset on the drilling platform, which are distributed in the construction area surrounded by the four positioning steel casings 10. When designing and installing the integral main beam 7 and the construction platform, the positions and construction space of the plurality of steel casings 22 to be constructed need to be taken into consideration. The plane frame of the integral main beam 7 surrounds the plurality of steel casings 22 and cannot occupy the space on the plane that overlaps with the position of the steel casings 22. Installation holes can be preset in advance on the construction platform according to the set installation position of the steel casings 22, so as to facilitate subsequent drilling construction directly on the construction platform. At the same time, the height position of the construction platform and the integral main beam 7 on the positioning steel casing 10 can be changed using lifting equipment without affecting the water level change.

[0050] The present invention designs a positioning steel casing and an integral main beam that can be inserted in a matching manner, and sets a detachable connection mechanism on the positioning steel casing as a support for the construction platform. The integral main beam and the construction platform are hoisted integrally by a lifting device to complete the position conversion of the drilling platform caused by a large change in the water level, thereby achieving the purpose of effectively adapting to the large change in the water level during construction in the reservoir area. Among them, the connection mechanism, the integral main beam and the construction platform are fully prefabricated and assembled, and can be directly hoisted to the construction site for installation after being prefabricated in advance, which greatly shortens the construction period and reduces the construction difficulty. In addition, since the integral main beam has good integrity, by welding it to the corbel, the positioning steel casing can form a stable whole, so that the drilling platform has better overall strength, rigidity and stability.

[0051] In another technical solution, the connection mechanism of the assembled drilling platform for bare rock pile foundation in the reservoir area further includes: a node plate 9, which is arranged below the multiple corbels 8 and connects the bottom of the multiple corbels 8 with the outer side wall of the steel hoop 18; an annular rib 17, which is arranged along the circumference of the steel hoop 18 and sequentially connects the multiple corbels 8 with the hoop ears 20 of the steel hoop 18, and the annular rib 17, the multiple corbels 8 and the hoop ears 20 of the steel hoop 18 together form an annular closed structure. Among them, the corbel 8 is welded to the upper part of the outer wall of the steel hoop 18, and a node plate 9 is arranged at the lower part of the outer wall of the steel hoop 18. The node plate 9 can be a plurality of node plates 9, which correspond to the plurality of corbels 8 one by one, and any node plate 9 is fixedly connected to the bottom of the corresponding corbel 8 and the lower part of the outer wall of the steel hoop 18; the node plate 9 can also be a ring plate continuously arranged around the circumference of the steel hoop 18, which simultaneously connects the bottom of the plurality of corbels 8 and the lower part of the outer wall of the steel hoop 18. The steel hoop 18 is two semicircular hoop plates, and the two ends of the hoop plates extend outward to form hoop ears 20 respectively. Two adjacent hoop ears 20 are connected and locked by high-strength bolts 21. An annular rib 17 is arranged between the hoop ears 20 and the plurality of corbels 8, so that the hoop ears 20 and the adjacent corbels 8, and the adjacent corbels 8 are connected to form a whole through the annular rib 17, thereby increasing the connection strength between the corbel and the steel hoop. By providing the node plate 9 and the annular rib 17, the stress concentration phenomenon at the connection between the corbel and the steel casing is effectively weakened, so that the stress bearing performance of the corbel is good and the stress bearing stability of the connection mechanism is improved.

[0052] In another technical solution, the said reservoir area bare rock pile foundation assembled drilling platform, the said connection mechanism also includes a rubber sheet 19, which is an annular structure sleeved on the said positioning steel casing 10 and fixed on the inner side of the said steel hoop 18. Therefore, the rubber sheet 19 is arranged between the steel hoop 18 and the positioning steel casing 10, so as to facilitate the use of the hoisting equipment to adjust the height of the construction platform, the integral main beam and the connection mechanism as a whole after loosening the steel hoop, and prevent the steel hoop from being deformed or damaging the positioning steel casing due to collision and other reasons during the movement.

[0053] In another technical solution, the described reservoir area bare rock pile foundation assembled drilling platform, the described construction platform includes a plurality of transverse distribution beams 6, which are fixed at parallel intervals on the top of the described integral main beam 7; a plurality of longitudinal distribution beams 5, which are fixed at parallel intervals on the top of the described plurality of transverse distribution beams 6, and any longitudinal distribution beam 5 is perpendicular to any transverse distribution beam 6; a panel 4, which is laid on the top of the described plurality of longitudinal distribution beams 5, and the described panel 4 is provided with a plurality of through holes, which correspond one by one to the plurality of steel casings 22 to be constructed. Specifically, the four corners of the integral main beam 7 are respectively provided with lifting ears 14, which are convenient for the overall lifting and installation using lifting equipment (lifting equipment) during construction. The plurality of through holes are the preset installation holes on the construction platform, which are convenient for the subsequent construction of the steel casing 22; in addition, when designing and installing the transverse distribution beams 6 and the longitudinal distribution beams 5, the positions and construction spaces of the plurality of steel casings 22 to be constructed shall also be considered, and the transverse distribution beams 6 and the longitudinal distribution beams 5 surround the plurality of steel casings 22, and cannot occupy the space on the plane that overlaps with the position of the steel casings 22. Through the structural design of the multi-layer beam body, the direct pressure on the panel 4 during construction is effectively and evenly distributed to the integral main beam 7 and the four positioning steel casings 10 below, so that the force of the supporting structure is reasonable, further ensuring the stability of the drilling platform during construction.

[0054] In another technical solution, the reservoir area bare rock pile foundation assembled drilling platform, the construction platform also includes a railing 11, which is fixed at the top edge of the panel 4 along the circumference of the panel 4, and can effectively prevent people or equipment from falling, so as to ensure the safety of drilling construction on the construction platform.

[0055] In another technical solution, the reservoir area bare rock pile group foundation assembled drilling platform also includes a plurality of reinforcing plates 16, which are fixed at intervals on the outer side wall of the integral main beam 7. Specifically, the integral main beam 7 is an integral equal-height main beam, which adopts a prefabricated assembly manufacturing method, each section main beam is welded with a uniform type of steel, and the joints are welded with groove welding to ensure that each section main beam is of equal height on the vertical surface, and a horizontal stiffening plate 15 is provided at the main beam joint to ensure the connection strength stability of the section main beam at the connection. At the same time, a reinforcing plate 16 is also provided in the middle of each section main beam to ensure the structural stability of the integral main beam by local reinforcement.

[0056] The present invention also provides a reservoir area bare rock pile foundation assembly drilling process, comprising:

[0057] Step 1: Setting up a floating platform near the planned installation area of ​​the drilling platform;

[0058] Step 2: placing a hammering device on the floating platform, and using the hammering device to hammer out four positioning pits in sequence underwater according to the positions of the four positioning steel casings 10; wherein the riverbed 12 has no covering layer and is a bare rock geology, and the positioning pits are formed by mechanical hammering;

[0059] Step 3: The four positioning steel casings 10 are sequentially installed in the four positioning pits, and underwater concrete 13 is poured between the bottom of any positioning steel casing 10 and the corresponding positioning pit; wherein, after the positioning steel casing 10 is lowered to the designed position, underwater concrete 13 is poured between the outer wall of the positioning steel casing 10 and the positioning pit, so that the positioning steel casing 10 is wrapped to form the main support structure of the drilling platform;

[0060] Step 4: Under low water level conditions in the reservoir area, the four connecting mechanisms are respectively installed at the same height of the four positioning steel casings 10, and the steel clamps 18 are locked;

[0061] Step 5: prefabricate and connect the integral main beam 7 to the construction platform, lift it as a whole and then lower it so that it is supported on the multiple brackets 8 of the four positioning steel casings 10, and fix the integral main beam 7 to the multiple brackets 8;

[0062] Step 6: construct multiple steel casings 22 on the construction platform according to the set positions of the multiple steel casings 22 to be constructed, and perform drilling construction;

[0063] Step 7. When the water level in the reservoir changes, loosen the steel hoop 18, lift the integral main beam 7, the construction platform and the connecting mechanism as a whole, adjust the position of the connecting mechanism on the positioning steel casing 10 according to the water level change and lock the steel hoop 18, and repeat step 6 until the drilling construction is completed.

[0064] In this embodiment, nine steel casings to be constructed are preset and arranged in a grid shape. They are numbered ①-⑨ in sequence, among which steel casings ①, ③, ⑦, and ⑨ are set as positioning steel casings. The drilling rig is placed on a floating platform. First, the riverbed 12 below the designed pile position of the positioning steel casing No. ① is punched. A hammer with a diameter of 3m is used to punch a punching pit (i.e., a positioning pit) with a depth of about 5.5m. Then, a positioning steel casing 10 of φ2500×16 is lowered, and underwater concrete 13 is poured to wrap the positioning steel casing No. ① for positioning. This method is used to complete the insertion and striking of the positioning steel casings No. ③, ⑦, and ⑨ in sequence. The four positioning steel casings cannot be punched and constructed at the same time. Any connecting mechanism includes four bull legs evenly distributed on the periphery of the steel hoop. The bracket is made of 2HM588×300 steel. The bracket, node plate, stiffening rib and steel hoop are prefabricated and transported to the site, and installed on the positioning steel casing as a connecting mechanism. The integral main beam is also a prefabricated structure. The integral main beam 7 assembled with the longitudinal distribution beam 5, the transverse distribution beam 6, the panel 4 and the railing 11 is transported to the site and hoisted as a whole using lifting equipment. When the integral main beam is installed on the bracket of the positioning steel casing, the four positioning steel casings form a "steel casing group" that can achieve self-stabilization, meeting the requirements of the drilling platform. After the drilling platform is fully erected, the remaining steel casings (②, ④, ⑤, ⑥, ⑧) can be constructed, and then normal drilling construction can be carried out. During the construction period, when the reservoir area enters the high water level period, the high-strength bolts 21 can be loosened, the connecting mechanism, the integral main beam and the construction platform can be hoisted as a whole, and the steel hoop can be reinstalled according to the construction height set at the high water level, and then normal construction can continue.

[0065] In another technical solution, in the process of prefabricated drilling of bare rock pile foundation in the reservoir area, in step 1, the step of setting up the floating platform is: firstly, a plurality of floating bodies 2 are connected as a whole according to the design requirements using a steel connecting beam 3 to form a floating platform, and then the four corners of the floating platform are connected to a nearby fixed structure using a traction rope 1 to ensure the stability of the platform. The nearby fixed structure can be a completed bridge fixed structure, a shore fixed structure, or a separately set up fixed structure on the water.

[0066] In another technical solution, in the reservoir area bare rock pile foundation assembly drilling process, in step seven, when the water level in the reservoir area rises to exceed the top of the positioning steel casing 10, the four positioning steel casings 10 are first raised, and then the steel clamp 18 is loosened and the position of the connecting mechanism on the positioning steel casing 10 is adjusted. That is, when the increase in the water level in the reservoir area exceeds the planned range value, it is necessary to additionally raise the positioning steel pipe piles so that the height adjustment of the drilling platform can meet the needs of real-time water level changes and avoid affecting the smooth progress of the drilling construction. In the process of raising the height, there is no need to dismantle the drilling platform (construction platform, integral main beam, etc.) first. After the positioning steel pipe piles are raised, the connecting mechanism can be hoisted and adjusted on the positioning steel pipe piles in the original working mode, so as to achieve a wider range of height adjustment of the drilling platform.

[0067] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A drilling process based on an assembled drilling platform for bare rock pile foundation in a reservoir area, characterized in that: The drilling platform includes: Four positioning steel casings are distributed at the four corners of the predetermined installation area of ​​the drilling platform, one end of each positioning steel casing is fixed under the riverbed, and the other end extends vertically upward out of the water surface; Four connecting mechanisms, which correspond to the four positioning steel casings one by one, each connecting mechanism comprising a steel hoop, which is sleeved on one end of the corresponding positioning steel casing extending out of the water surface and is detachably connected thereto; a plurality of brackets, which are fixed on the outer side wall of the steel hoop at intervals along the circumference thereof; An integral main beam, which is a planar frame structure sleeved on the outside of the four positioning steel casings, and the integral main beam is supported on and fixedly connected to the plurality of corbels; A construction platform, which is arranged on the top of the integral main beam and does not contact the four positioning steel casings; The drilling process includes: Step 1: Setting up a floating platform near the planned installation area of ​​the drilling platform; Step 2: placing a punching device on the floating platform, and using the punching device to punch out four positioning pits in sequence underwater according to the positions of the four positioning steel casings; Step 3: installing the four positioning steel casings in the four positioning pits in sequence, and pouring underwater concrete between the bottom of any positioning steel casing and the corresponding positioning pit; Step 4: Under low water level conditions in the reservoir area, install the four connection mechanisms to the same height of the four positioning steel casings, and lock the steel clamps; Step 5: prefabricate and connect the integral main beam to the construction platform, lift it as a whole and then lower it so that it is supported on the multiple brackets of the four positioning steel casings, and fix the integral main beam to the multiple brackets; Step 6: construct multiple steel casings on the construction platform according to the set positions of multiple steel casings to be constructed, and perform drilling construction; Step 7. When the water level in the reservoir changes, loosen the steel clamp, lift the integral main beam, construction platform and connecting mechanism as a whole, adjust the position of the connecting mechanism on the positioning steel casing according to the water level change and lock the steel clamp, repeat step 6 until the drilling construction is completed.

2. The drilling process of the assembled drilling platform based on the bare rock pile foundation in the reservoir area according to claim 1 is characterized in that: The connecting mechanism also includes: a node plate, which is arranged below the multiple corbels and connects the bottoms of the multiple corbels and the outer side walls of the steel hoop; an annular rib, which is arranged along the circumference of the steel hoop and sequentially connects the multiple corbels and the hoop ears of the steel hoop, and the annular rib, the multiple corbels and the hoop ears of the steel hoop together form an annular closed structure.

3. The drilling process of the assembled drilling platform based on the bare rock pile foundation in the reservoir area according to claim 1 is characterized in that: The connecting mechanism also includes a rubber sheet, which is an annular structure sleeved on the positioning steel casing and fixed on the inner side of the steel hoop.

4. The drilling process of the assembled drilling platform based on the bare rock pile foundation in the reservoir area according to claim 1 is characterized in that: The construction platform includes a plurality of transverse distribution beams, which are fixed in parallel and at intervals on the top of the integral main beam; a plurality of longitudinal distribution beams, which are fixed in parallel and at intervals on the top of the plurality of transverse distribution beams, and any longitudinal distribution beam is perpendicular to any transverse distribution beam; a panel, which is laid on the top of the plurality of longitudinal distribution beams, and the panel is provided with a plurality of through holes, which correspond one by one to a plurality of steel casings to be constructed.

5. The drilling process of the assembled drilling platform based on the bare rock pile foundation in the reservoir area according to claim 4 is characterized in that: The construction platform further includes a railing fixed at a top edge of the panel along a circumference of the panel.

6. The drilling process of the assembled drilling platform based on the bare rock pile foundation in the reservoir area according to claim 1 is characterized in that: It also includes a plurality of reinforcing plates which are fixed at intervals on the outer side walls of the integral main beam.

7. The drilling process of the assembled drilling platform based on the bare rock pile foundation in the reservoir area according to claim 1 is characterized in that: In step one, the steps of setting up the floating platform are: firstly, using steel connecting beams to connect multiple floating bodies as designed to form a floating platform, and then using towing ropes to connect the four corners of the floating platform to nearby fixed structures.

8. The drilling process of the assembled drilling platform based on the bare rock pile foundation in the reservoir area according to claim 1 is characterized in that: In step seven, when the water level in the reservoir area rises to exceed the top of the positioning steel casing, the four positioning steel casings are first raised, and then the steel clamp is loosened and the position of the connecting mechanism on the positioning steel casing is adjusted.

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