A circular deep well working platform structure and construction method thereof

Abstract

This invention discloses a circular deep well working platform structure and its construction method, including a capping beam, supporting devices, precast T-beams, UHPC (Ultra-High-Pressure Polymer) formwork, a cast-in-place platform slab, and platform openings. The capping beam is located at the top of the deep well wall, and the supporting devices are spaced apart on the top surface of the capping beam. The precast T-beams span the deep well and are matched with the supporting devices, with narrow flanges formed at their upper and lower parts. Notches are reserved on both sides of the top of the upper flange. The UHPC formwork is erected on the notches of adjacent precast T-beams. The top surface of the capping beam has a raised section flush with the notch. The supporting devices are located on the inner side of the top surface of the capping beam, and the raised section is located on the outer side of the top surface of the capping beam. The UHPC formwork is matched and erected on the corresponding notches of the precast T-beams and the raised sections. The UHPC formwork is longitudinally adjacent to the beam and leaves gaps as needed. The cast-in-place platform slab is integrally cast on the precast T-beams, UHPC formwork, and raised sections, and platform openings are formed at each gap. This allows the deep well working platform to open as needed, ensuring complete platform function and structural safety.

Description

Technical Field

[0001] This invention relates to the field of deep well construction technology, and in particular to a circular deep well working platform structure and its construction method. Background Technology

[0002] A deep well working platform refers to an operational platform used for constructing factory buildings, laying equipment and pipelines, etc., on the upper part of a deep well, integrating construction, operation, and maintenance functions. Traditional deep well working platforms typically use wide-flange T-beams for erection, which has at least the following problems:

[0003] (1) The working face of the deep well T-beam erection is high above the ground, making it impossible to set up ground support. Using suspended formwork is difficult and the quality is not easy to guarantee.

[0004] (2) Wide flanges occupy a large area, and the platform opening usually cannot avoid the flange plate of the beam. It is necessary to match the opening on the flange plate. The opening on the flange plate not only affects the overall structural stress performance of the beam, but also increases the difficulty of T-beam prefabrication because the platform opening has various different requirements such as size and position according to the actual situation. It cannot be prefabricated in the factory.

[0005] (3) Some deep well working platforms adopt a semi-circular platform structure with beams erected on the semi-circular well body and empty semi-circular platform. Factory equipment is erected on the side of the semi-circular platform, and pipelines and stairs are led out on the empty side of the semi-circular platform. Although this platform structure solves the aforementioned (2) problem to a certain extent, it sacrifices the integrity of the platform and increases the danger in the operation and maintenance process.

[0006] (4) The misalignment at the connection between the end of the wide flange T-beam and the circular well body is large and cannot be safely and conveniently filled. The integrity of the working platform is insufficient, which reduces the utilization efficiency of the platform plane and increases the danger in the operation and maintenance process. Summary of the Invention

[0007] To address the deficiencies and shortcomings of the existing technologies, this invention proposes a circular deep well working platform structure and its construction method, which solves the problems of limited openings in existing platform structures, the difficulty of prefabricating T-beams in factories due to diverse opening requirements, the high difficulty of formwork construction, insufficient platform integrity, and safety risks in operation and maintenance.

[0008] The above-mentioned objective of this invention is achieved through the following technical solution:

[0009] A circular deep well working platform structure includes a top beam, a support device, a precast T-beam, a UHPC non-removable formwork, a platform cast-in-place slab, and a platform opening;

[0010] The capping beam is located at the top of the circular deep well wall. Several support devices are arranged circumferentially at intervals on the top surface of the capping beam. Several precast T-beams are parallel to each other and span the deep well, with their two ends respectively matched and placed on the corresponding support devices.

[0011] Each precast T-beam has narrow flange plates projecting outward from both sides of the beam rib at its upper and lower parts. The upper flange plate has notches on both sides of its top. Several UHPC non-removable templates are erected at both ends on the notches of two adjacent precast T-beams, adjacent to each other along the longitudinal direction of the precast T-beams and leaving gaps as needed for the platform openings required for subsequent construction. The top surface of the capping beam has a raised section that is flush with the bottom surface of the notch, with the center of the deep well as the inner side. Several support devices are located on the inner side of the top surface of the capping beam, and the raised section is located on the outer side of the top surface of the capping beam. Several UHPC non-removable templates are matched and erected on the notches and raised sections of the corresponding precast T-beams, adjacent to each other along the longitudinal direction of the precast T-beams and leaving gaps as needed for the platform openings required for subsequent construction.

[0012] Each precast T-beam, each UHPC formwork without removal, and the raised section are integrally cast with concrete to form the platform slab, while the platform openings required for each void are formed.

[0013] Preferably, the inner wall of the raised section is clearance-fitted with the end of the precast T-beam, and the outer wall is attached to the inner wall of the enclosure wall of the working well above ground structure on the top pressure beam.

[0014] Preferably, a rubber expansion joint is provided between the portion of the platform cast-in-place slab located on the raised section and the portion located on the precast T-beam and the UHPC non-removable formwork.

[0015] Preferably, the upper and lower flanges of the precast T-beam are both horseshoe-shaped in cross-section.

[0016] Preferably, the width of the upper flange plate extending outwards on both sides is consistent with the width of the beam rib.

[0017] Preferably, the upper flange and the lower flange are of equal width.

[0018] Preferably, the top of both the precast T-beam and the heightened section is pre-embedded with connecting steel bars to connect the platform's cast-in-place slab.

[0019] Preferably, the thickness of the UHPC non-removable template matches the depth of the notch;

[0020] The length of the UHPC non-removable formwork is matched to the distance between the two precast T-beams erected, or the distance between the outermost precast T-beam and the heightened part;

[0021] The UHPC formwork between two adjacent precast T-beams and between the outermost precast T-beam and the heightened section includes at least one rectangular plate of appropriate width and quantity, and a non-rectangular plate that matches the erection space at the edge of the platform.

[0022] Preferably, the support device includes a concrete pad cast on the top surface of the capping beam, and rubber supports are installed on the concrete pad.

[0023] As a general inventive concept, this invention also proposes a construction method for the above-mentioned circular deep well working platform structure, comprising the following steps:

[0024] S1. Determine the structural dimensions and reinforcement of the precast T-beams, and complete the precast T-beams;

[0025] S2. Determine the plan layout of the precast T-beams. Based on the plan layout of the precast T-beams, arrange the support device on the top surface of the capping beam, determine the heightening edge line, and cast the heightened part along the heightening edge line.

[0026] S3. Hoist each precast T-beam onto the corresponding support device;

[0027] S4. Erect UHPC non-removable formwork between two adjacent precast T-beams and between the outermost precast T-beam and the heightened section, and leave gaps in the corresponding positions according to the opening requirements;

[0028] S5. Set up corresponding opening templates at each open space, and then pour concrete into each precast T-beam, each UHPC template that can be removed, and the heightened part to form the cast-in-place concrete platform slab and the required platform openings.

[0029] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0030] (1) The template uses a new type of ultra-high performance concrete slab (UPHC slab), which has high load-bearing capacity, is simple and thin, and has strong flexibility, which facilitates opening, reduces construction difficulty, and ensures construction quality. Through the erection of UHPC non-removable template, the platform's cast-in-place slab and precast T-beam are reliably connected, which increases the overall structure and improves the safety and reliability of the platform's overall structure. At the same time, the template, as part of the platform structure, is exempt from disassembly, which speeds up the construction progress.

[0031] (2) The precast T-beams are constructed in a double horseshoe structure with an inverted horseshoe shape at the top and a horseshoe shape at the bottom. The beams have strong load-bearing capacity and high stability. The narrow flange T-beams can reserve enough space for platform openings, and the beam spacing can be adjusted within a certain range. This allows the platform openings to be set as needed according to the location of equipment, pipelines, and maintenance passages, solving the problem of limited platform openings in existing schemes and improving the efficiency of platform utilization. At the same time, the narrowing of the flange plates does not come at the cost of structural safety. On the contrary, the factory prefabrication of the T-beams and the uniform integrity of the beams (no holes need to be opened on the flange plates) make it easier to ensure the quality of the project.

[0032] (3) The present invention sets up a heightening section on the top beam to facilitate the construction of a complete platform casting template (including the UHPC non-removable template, the top of the precast T beam and the top of the heightening section), so as to realize the overall casting of the entire platform and solve the problem of insufficient platform integrity in the existing scheme; at the same time, rubber expansion joints are installed between the part of the platform cast-in-place slab located on the heightening section and the part located on the precast T beam and the UHPC non-removable template, which further ensures the integrity of the platform inside the well. The platform has complete functions, safe operation and maintenance and reasonable cost.

[0033] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0034] Figure 1 This is a plan view of the circular deep well working platform structure in this embodiment;

[0035] Figure 2 for Figure 1 Schematic diagram of the AA section;

[0036] Figure 3 for Figure 1 Schematic diagram of cross section BB (staircase equipment, etc. are not shown);

[0037] Figure 4 This is a partial schematic diagram of the circular deep well working platform structure in this embodiment;

[0038] Figure 5 This is a schematic diagram of the cross-section of a precast T-beam;

[0039] In the diagram: 1. Top beam; 2. Support device; 3. Precast T-beam; 4. UHPC formwork; 5. Platform slab; 6. Platform opening; 7. Heightening section; 8. Rubber expansion joint; 9. Deep well wall; 10. Enclosure wall. Detailed Implementation

[0040] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0041] To better illustrate this embodiment, some parts in the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions;

[0042] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings;

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The terms "upper," "lower," "left," "right," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0044] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] like Figure 1 As shown, the circular deep well working platform structure of the present invention includes a capping beam 1, support devices 2, precast T-beams 3, UHPC non-removable formwork 4, a platform cast-in-place slab 5, and a platform opening 6. The capping beam 1 is located at the top of the circular deep well wall 9. Several support devices 2 are arranged circumferentially at intervals on the top surface of the capping beam 1. Several precast T-beams 3 with different spans cross the deep well parallel to each other, with their ends respectively matched and placed on corresponding support devices 2. In this embodiment, the support device 2 adopts an existing support structure, including a concrete pad cast on the top surface of the capping beam 1, rubber supports installed on the concrete pad, and each precast T-beam 3 having its two ends placed on two corresponding rubber supports.

[0046] like Figure 2 , Figure 4 As shown, each precast T-beam 3 has narrow flange plates projecting outwards from both sides of the beam rib at its upper and lower parts, replacing the existing wide-flange T-beams (with a wider upper flange plate). This T-beam structure provides sufficient space for platform openings, and the beam spacing can be adjusted within a certain range. This allows for on-demand openings based on equipment, pipeline, and maintenance access locations, without the need for holes in the flange plates, facilitating factory prefabrication of the T-beams and ensuring the uniformity and integrity of the beam structure. The upper flange plate has 5cm*5cm stepped notches on both sides at its top. Several UHPC non-removable formwork templates 4 are erected at both ends on the notches of two adjacent precast T-beams 3, adjacent to each other longitudinally along the precast T-beams and leaving gaps as needed for subsequent platform openings during construction. Furthermore, as... Figure 3As shown, the top surface of the capping beam 1 has a raised section 7 that is flush with the bottom surface of the notch. With the center of the deep well as the inner side, several support devices 2 are located on the inner side of the top surface of the capping beam 1, and the raised section 7 is located on the outer side of the top surface of the capping beam 1. That is, the inner side of the top surface of the capping beam and the raised section form a single-step cross-section. This facilitates the erection of the precast T-beams 3 and also allows the UHPC non-removable formwork 4 at the edge of the platform to be matched and erected on the notch and raised section of the corresponding precast T-beams. Figure 1 The UHPC non-removable formwork between the uppermost / lowest precast T-beam and the heightened section is adjacent to the longitudinal direction of the precast T-beam and left open as needed for the platform opening required for subsequent construction.

[0047] The platform slab 5 is integrally cast with concrete on each precast T-beam 3, each UHPC formwork 4 (removable), and the raised section 7. Simultaneously, platform openings 6 are formed at the designated gaps. This creates a working plane for the deep well platform, facilitating the erection of factory buildings and equipment. The platform slab 5 directly bears various loads. The precast T-beams 3 are the main load-bearing structure of the working platform. Loads are transferred from the platform slab 5 to the precast T-beams 3, and then through the support device 2 to the capping beam 1, ensuring overall stability and reliability. Platform openings 6 are created as needed between two adjacent precast T-beams 3, and / or on the outermost precast T-beam 3 (e.g., ...). Figure 1 The specific location, quantity, and size of the precast T-beams (the uppermost / lowest sides) and the capping beam 1 are determined according to the needs of platform equipment erection, pipeline laying, and maintenance access.

[0048] The inner wall of the raised section 7 is clearance-fitted with the end of the precast T-beam 3. Specifically, the clearance between the inner wall of the raised section 7 and the nearest point of the end of the precast T-beam 3 (including the end face and adjacent side portion) is 30mm to facilitate beam hoisting. The outer wall of the raised section 7 is attached to the inner wall (including the inner convex wall of the column) of the enclosure wall 10 of the working well above ground structure on the capping beam 1. It should be noted that when raising the section on the capping beam 1, the raised edge line (mainly the inner edge line) must first be determined according to the plan layout of the precast T-beam 3. It must be ensured that the formed raised section 7 will not obstruct the beam hoisting and can meet the erection requirements of the UHPC non-removable formwork 4 at the platform edge. Figure 1 As shown, the inner edge of the heightened area is an irregular closed shape, which is formed by connecting multiple straight line segments end to end; the outer edge of the heightened area is the inner edge of the retaining wall 10 of the working well above ground structure on the top beam 1 (including the inner convex edge of the column).

[0049] To better ensure the integrity of the platform inside the well, a rubber expansion joint 8 is provided between the portion of the cast-in-place slab 5 located on the raised section 7 and the portion located on the precast T-beam 3 and the UHPC non-removable formwork 4. In other words, the rubber expansion joint is set along the inner edge of the raised section.

[0050] like Figure 5As shown, the upper flange of the precast T-beam 3 is inverted horseshoe shape, and the lower flange is horseshoe shape. The double horseshoe structure provides strong load-bearing capacity and high stability. Optionally, the width of the cantilever on both sides of the upper flange is the same as the width of the beam rib, for example, both being 20cm. That is, the width of the upper flange is: 20 + 20 + 20 = 60cm. More preferably, the upper and lower flanges are of equal width, both 60cm.

[0051] It should be understood that the top of both the precast T-beam 3 and the heightened section 7 is pre-embedded with connecting steel bars to strengthen the connection between the precast T-beam and the heightened section and the cast-in-place slab 5 of the platform.

[0052] The thickness of the UHPC template 4 matches the depth of the notch; in this embodiment, it is 5cm thick. The length of the UHPC template 4 matches the distance between the two precast T-beams 3 or the distance between the outermost precast T-beam 3 and the extension 7. It should be noted that the spacing of the precast T-beams 3 can be adjusted within a certain range according to the opening requirements, as long as it does not affect the load-bearing performance of the UHPC template. To achieve longitudinal adjacency of the UHPC template 4 between two adjacent precast T-beams 3 with gaps as needed, and between the outermost precast T-beam 3 and the extension 7 with longitudinal adjacency of the UHPC template 4 with gaps as needed, the UHPC template 4 is available in various widths of rectangular plates and non-rectangular plates whose shape matches the space at the edge of the platform (which can be cut from rectangular UHPC templates or precast). For example, between two adjacent precast T-beams 3, ten 1.5m wide and six 1m wide rectangular UHPC (Ultra-High-Pressure Polymer) formwork panels 4 are erected. The placement of these rectangular panels of different widths is determined based on the location and size of the platform opening to be created between the two precast T-beams, allowing for appropriate clearance at the required locations. Spaces near the platform edges at both ends of the beams are filled using UHPC formwork panels 4 of appropriate shapes such as trapezoids and small rectangles, thus constructing a complete platform casting formwork. It should be understood that the complete platform casting formwork includes the erected UHPC formwork panels 4, the top of the precast T-beams 3, and the top of the raised section 7.

[0053] The present invention also proposes a construction method for the above-mentioned circular deep well working platform structure, comprising the following steps:

[0054] S1. Determine the structural dimensions and reinforcement arrangement of the precast T-beams based on the dimensions of the deep well structure and the magnitude of various loads on the platform, and complete the precast T-beams. Except for the span, all precast T-beams have the same structure, facilitating factory construction. During precasting, notches are reserved on both sides of the beam top, and connecting steel bars are pre-embedded in the beam top.

[0055] S2. Determine the plan layout of the precast T-beams (adjust and determine the spacing) based on the factory layout, opening requirements, and operation and maintenance requirements on the platform. Based on the plan layout of the precast T-beams, set up support devices at the corresponding positions on the top surface of the capping beam, determine the heightening edge line, set up formwork along the heightening edge line and pour concrete until it is flush with the bottom surface of the gap to form the heightened part, and pre-embed connecting steel bars at the top.

[0056] S3. Using a truck crane for two-point lifting, the precast T-beams are erected on the corresponding support devices to complete the beam lifting.

[0057] S4. Erect UHPC non-removable formwork between two adjacent precast T-beams and between the outermost precast T-beam and the heightened section, and leave gaps in the corresponding positions according to the opening requirements.

[0058] S5. Set up corresponding opening templates at each reserved space, and then integrally cast concrete platform slabs and required platform openings on each precast T-beam, each UHPC formwork without removal, and the raised section. Rubber expansion joints are provided between the portion of the platform slab located on the raised section and the portion located on the precast T-beams and UHPC formwork without removal.

[0059] It should be noted that each opening is reinforced with steel bars to ensure the structural strength of the platform openings; for other structures not mentioned, please refer to the prior art.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A circular deep well working platform structure, characterized in that, This includes capping beams, support devices, precast T-beams, UHPC formwork that does not require dismantling, cast-in-place platform slabs, and platform openings; The capping beam is located at the top of the circular deep well wall. Several support devices are arranged circumferentially at intervals on the top surface of the capping beam. Several precast T-beams are parallel to each other and span the deep well, with their ends respectively matched and placed on the corresponding support devices. The support device includes a concrete pad stone poured on the top surface of the capping beam, and rubber bearings are installed on the concrete pad stone. Each precast T-beam has narrow flange plates projecting outward from both sides of the beam rib at its upper and lower parts. The upper flange plate has pre-reserved notches on both sides at its top. Several UHPC (Ultra-High-Pressure Polymer) templates are erected at both ends on the notches of two adjacent precast T-beams, adjacent to each other longitudinally along the precast T-beams and leaving gaps as needed for subsequent construction and forming of the platform openings. Furthermore, the top surface of the capping beam has a raised section flush with the bottom surface of the notch, with the center of the deep well as the inner side. Several supporting devices are located on the inner side of the top surface of the capping beam, and the raised section is located on the outer side of the top surface of the capping beam. Several UHPC templates are matched and erected on the notches and raised sections of the corresponding precast T-beams, adjacent to each other longitudinally along the precast T-beams and leaving gaps as needed for subsequent construction and forming of the platform openings. The upper and lower flange plates of the precast T-beams both have horseshoe-shaped cross-sections. Each precast T-beam, each UHPC formwork without removal, and the raised section are integrally cast with concrete to form the platform slab, while the platform openings required for each void are formed at the same time. The inner wall of the raised section is fitted with the end of the precast T-beam with a clearance, and the outer wall is attached to the inner wall of the enclosure wall of the working well above ground structure on the top pressure beam.

2. The circular deep well working platform structure according to claim 1, characterized in that, A rubber expansion joint is provided between the portion of the platform's cast-in-place slab located on the raised section and the portion located on the precast T-beam and the UHPC non-removable formwork.

3. The circular deep well working platform structure according to claim 1, characterized in that, The width of the upper flange plate extending outwards on both sides is the same as the width of the beam rib.

4. The circular deep well working platform structure according to claim 1, characterized in that, The upper and lower flanges are of equal width.

5. The circular deep well working platform structure according to claim 1, characterized in that, The top of both the precast T-beams and the heightened section are pre-embedded with connecting steel bars to connect to the cast-in-place platform slab.

6. The circular deep well working platform structure according to claim 1, characterized in that, The thickness of the UHPC non-removable template matches the depth of the notch; The length of the UHPC non-removable formwork is matched to the distance between the two precast T-beams erected, or the distance between the outermost precast T-beam and the heightened part; The UHPC formwork between two adjacent precast T-beams and between the outermost precast T-beam and the heightened section includes at least one rectangular plate of appropriate width and quantity, and a non-rectangular plate that matches the erection space at the edge of the platform.

7. A construction method for a circular deep well working platform structure as described in claim 1, characterized in that, Includes the following steps: S1. Determine the structural dimensions and reinforcement of the precast T-beams, and complete the precast T-beams; S2. Determine the plan layout of the precast T-beams. Based on the plan layout of the precast T-beams, arrange the support device on the top surface of the capping beam, determine the heightening edge line, and cast the heightened part along the heightening edge line. S3. Hoist each precast T-beam onto the corresponding support device; S4. Erect UHPC non-removable formwork between two adjacent precast T-beams and between the outermost precast T-beam and the heightened section, and leave gaps in the corresponding positions according to the opening requirements; S5. Set up corresponding opening templates at each open space, and then pour concrete into each precast T-beam, each UHPC template that can be removed, and the heightened part to form the cast-in-place concrete platform slab and the required platform openings.

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